sctp_indata.c

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    1 /*-
    2  * Copyright (c) 2001-2007, by Cisco Systems, Inc. All rights reserved.
    3  *
    4  * Redistribution and use in source and binary forms, with or without
    5  * modification, are permitted provided that the following conditions are met:
    6  *
    7  * a) Redistributions of source code must retain the above copyright notice,
    8  *   this list of conditions and the following disclaimer.
    9  *
   10  * b) Redistributions in binary form must reproduce the above copyright
   11  *    notice, this list of conditions and the following disclaimer in
   12  *   the documentation and/or other materials provided with the distribution.
   13  *
   14  * c) Neither the name of Cisco Systems, Inc. nor the names of its
   15  *    contributors may be used to endorse or promote products derived
   16  *    from this software without specific prior written permission.
   17  *
   18  * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
   19  * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO,
   20  * THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
   21  * ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR CONTRIBUTORS BE
   22  * LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
   23  * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
   24  * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
   25  * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
   26  * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
   27  * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF
   28  * THE POSSIBILITY OF SUCH DAMAGE.
   29  */
   30 
   31 /* $KAME: sctp_indata.c,v 1.36 2005/03/06 16:04:17 itojun Exp $  */
   32 
   33 #include <sys/cdefs.h>
   34 __FBSDID("$FreeBSD$");
   35 
   36 #include <netinet/sctp_os.h>
   37 #include <netinet/sctp_var.h>
   38 #include <netinet/sctp_sysctl.h>
   39 #include <netinet/sctp_pcb.h>
   40 #include <netinet/sctp_header.h>
   41 #include <netinet/sctputil.h>
   42 #include <netinet/sctp_output.h>
   43 #include <netinet/sctp_input.h>
   44 #include <netinet/sctp_indata.h>
   45 #include <netinet/sctp_uio.h>
   46 #include <netinet/sctp_timer.h>
   47 
   48 
   49 /*
   50  * NOTES: On the outbound side of things I need to check the sack timer to
   51  * see if I should generate a sack into the chunk queue (if I have data to
   52  * send that is and will be sending it .. for bundling.
   53  *
   54  * The callback in sctp_usrreq.c will get called when the socket is read from.
   55  * This will cause sctp_service_queues() to get called on the top entry in
   56  * the list.
   57  */
   58 
   59 void
   60 sctp_set_rwnd(struct sctp_tcb *stcb, struct sctp_association *asoc)
   61 {
   62         uint32_t calc, calc_save;
   63 
   64         /*
   65          * This is really set wrong with respect to a 1-2-m socket. Since
   66          * the sb_cc is the count that everyone as put up. When we re-write
   67          * sctp_soreceive then we will fix this so that ONLY this
   68          * associations data is taken into account.
   69          */
   70         if (stcb->sctp_socket == NULL)
   71                 return;
   72 
   73         if (stcb->asoc.sb_cc == 0 &&
   74             asoc->size_on_reasm_queue == 0 &&
   75             asoc->size_on_all_streams == 0) {
   76                 /* Full rwnd granted */
   77                 asoc->my_rwnd = max(SCTP_SB_LIMIT_RCV(stcb->sctp_socket),
   78                     SCTP_MINIMAL_RWND);
   79                 return;
   80         }
   81         /* get actual space */
   82         calc = (uint32_t) sctp_sbspace(&stcb->asoc, &stcb->sctp_socket->so_rcv);
   83 
   84         /*
   85          * take out what has NOT been put on socket queue and we yet hold
   86          * for putting up.
   87          */
   88         calc = sctp_sbspace_sub(calc, (uint32_t) asoc->size_on_reasm_queue);
   89         calc = sctp_sbspace_sub(calc, (uint32_t) asoc->size_on_all_streams);
   90 
   91         if (calc == 0) {
   92                 /* out of space */
   93                 asoc->my_rwnd = 0;
   94                 return;
   95         }
   96         /* what is the overhead of all these rwnd's */
   97 
   98         calc = sctp_sbspace_sub(calc, stcb->asoc.my_rwnd_control_len);
   99         calc_save = calc;
  100 
  101         asoc->my_rwnd = calc;
  102         if ((asoc->my_rwnd == 0) &&
  103             (calc < stcb->asoc.my_rwnd_control_len)) {
  104                 /*-
  105                  * If our rwnd == 0 && the overhead is greater than the
  106                  * data onqueue, we clamp the rwnd to 1. This lets us
  107                  * still accept inbound segments, but hopefully will shut
  108                  * the sender down when he finally gets the message. This
  109                  * hopefully will gracefully avoid discarding packets.
  110                  */
  111                 asoc->my_rwnd = 1;
  112         }
  113         if (asoc->my_rwnd &&
  114             (asoc->my_rwnd < stcb->sctp_ep->sctp_ep.sctp_sws_receiver)) {
  115                 /* SWS engaged, tell peer none left */
  116                 asoc->my_rwnd = 1;
  117         }
  118 }
  119 
  120 /* Calculate what the rwnd would be */
  121 uint32_t
  122 sctp_calc_rwnd(struct sctp_tcb *stcb, struct sctp_association *asoc)
  123 {
  124         uint32_t calc = 0, calc_save = 0, result = 0;
  125 
  126         /*
  127          * This is really set wrong with respect to a 1-2-m socket. Since
  128          * the sb_cc is the count that everyone as put up. When we re-write
  129          * sctp_soreceive then we will fix this so that ONLY this
  130          * associations data is taken into account.
  131          */
  132         if (stcb->sctp_socket == NULL)
  133                 return (calc);
  134 
  135         if (stcb->asoc.sb_cc == 0 &&
  136             asoc->size_on_reasm_queue == 0 &&
  137             asoc->size_on_all_streams == 0) {
  138                 /* Full rwnd granted */
  139                 calc = max(SCTP_SB_LIMIT_RCV(stcb->sctp_socket),
  140                     SCTP_MINIMAL_RWND);
  141                 return (calc);
  142         }
  143         /* get actual space */
  144         calc = (uint32_t) sctp_sbspace(&stcb->asoc, &stcb->sctp_socket->so_rcv);
  145 
  146         /*
  147          * take out what has NOT been put on socket queue and we yet hold
  148          * for putting up.
  149          */
  150         calc = sctp_sbspace_sub(calc, (uint32_t) asoc->size_on_reasm_queue);
  151         calc = sctp_sbspace_sub(calc, (uint32_t) asoc->size_on_all_streams);
  152 
  153         if (calc == 0) {
  154                 /* out of space */
  155                 return (calc);
  156         }
  157         /* what is the overhead of all these rwnd's */
  158         calc = sctp_sbspace_sub(calc, stcb->asoc.my_rwnd_control_len);
  159         calc_save = calc;
  160 
  161         result = calc;
  162         if ((result == 0) &&
  163             (calc < stcb->asoc.my_rwnd_control_len)) {
  164                 /*-
  165                  * If our rwnd == 0 && the overhead is greater than the
  166                  * data onqueue, we clamp the rwnd to 1. This lets us
  167                  * still accept inbound segments, but hopefully will shut
  168                  * the sender down when he finally gets the message. This
  169                  * hopefully will gracefully avoid discarding packets.
  170                  */
  171                 result = 1;
  172         }
  173         if (result &&
  174             (result < stcb->sctp_ep->sctp_ep.sctp_sws_receiver)) {
  175                 /* SWS engaged, tell peer none left */
  176                 result = 1;
  177         }
  178         return (result);
  179 }
  180 
  181 
  182 
  183 /*
  184  * Build out our readq entry based on the incoming packet.
  185  */
  186 struct sctp_queued_to_read *
  187 sctp_build_readq_entry(struct sctp_tcb *stcb,
  188     struct sctp_nets *net,
  189     uint32_t tsn, uint32_t ppid,
  190     uint32_t context, uint16_t stream_no,
  191     uint16_t stream_seq, uint8_t flags,
  192     struct mbuf *dm)
  193 {
  194         struct sctp_queued_to_read *read_queue_e = NULL;
  195 
  196         sctp_alloc_a_readq(stcb, read_queue_e);
  197         if (read_queue_e == NULL) {
  198                 goto failed_build;
  199         }
  200         read_queue_e->sinfo_stream = stream_no;
  201         read_queue_e->sinfo_ssn = stream_seq;
  202         read_queue_e->sinfo_flags = (flags << 8);
  203         read_queue_e->sinfo_ppid = ppid;
  204         read_queue_e->sinfo_context = stcb->asoc.context;
  205         read_queue_e->sinfo_timetolive = 0;
  206         read_queue_e->sinfo_tsn = tsn;
  207         read_queue_e->sinfo_cumtsn = tsn;
  208         read_queue_e->sinfo_assoc_id = sctp_get_associd(stcb);
  209         read_queue_e->whoFrom = net;
  210         read_queue_e->length = 0;
  211         atomic_add_int(&net->ref_count, 1);
  212         read_queue_e->data = dm;
  213         read_queue_e->spec_flags = 0;
  214         read_queue_e->tail_mbuf = NULL;
  215         read_queue_e->aux_data = NULL;
  216         read_queue_e->stcb = stcb;
  217         read_queue_e->port_from = stcb->rport;
  218         read_queue_e->do_not_ref_stcb = 0;
  219         read_queue_e->end_added = 0;
  220         read_queue_e->some_taken = 0;
  221         read_queue_e->pdapi_aborted = 0;
  222 failed_build:
  223         return (read_queue_e);
  224 }
  225 
  226 
  227 /*
  228  * Build out our readq entry based on the incoming packet.
  229  */
  230 static struct sctp_queued_to_read *
  231 sctp_build_readq_entry_chk(struct sctp_tcb *stcb,
  232     struct sctp_tmit_chunk *chk)
  233 {
  234         struct sctp_queued_to_read *read_queue_e = NULL;
  235 
  236         sctp_alloc_a_readq(stcb, read_queue_e);
  237         if (read_queue_e == NULL) {
  238                 goto failed_build;
  239         }
  240         read_queue_e->sinfo_stream = chk->rec.data.stream_number;
  241         read_queue_e->sinfo_ssn = chk->rec.data.stream_seq;
  242         read_queue_e->sinfo_flags = (chk->rec.data.rcv_flags << 8);
  243         read_queue_e->sinfo_ppid = chk->rec.data.payloadtype;
  244         read_queue_e->sinfo_context = stcb->asoc.context;
  245         read_queue_e->sinfo_timetolive = 0;
  246         read_queue_e->sinfo_tsn = chk->rec.data.TSN_seq;
  247         read_queue_e->sinfo_cumtsn = chk->rec.data.TSN_seq;
  248         read_queue_e->sinfo_assoc_id = sctp_get_associd(stcb);
  249         read_queue_e->whoFrom = chk->whoTo;
  250         read_queue_e->aux_data = NULL;
  251         read_queue_e->length = 0;
  252         atomic_add_int(&chk->whoTo->ref_count, 1);
  253         read_queue_e->data = chk->data;
  254         read_queue_e->tail_mbuf = NULL;
  255         read_queue_e->stcb = stcb;
  256         read_queue_e->port_from = stcb->rport;
  257         read_queue_e->spec_flags = 0;
  258         read_queue_e->do_not_ref_stcb = 0;
  259         read_queue_e->end_added = 0;
  260         read_queue_e->some_taken = 0;
  261         read_queue_e->pdapi_aborted = 0;
  262 failed_build:
  263         return (read_queue_e);
  264 }
  265 
  266 
  267 struct mbuf *
  268 sctp_build_ctl_nchunk(struct sctp_inpcb *inp,
  269     struct sctp_sndrcvinfo *sinfo)
  270 {
  271         struct sctp_sndrcvinfo *outinfo;
  272         struct cmsghdr *cmh;
  273         struct mbuf *ret;
  274         int len;
  275         int use_extended = 0;
  276 
  277         if (sctp_is_feature_off(inp, SCTP_PCB_FLAGS_RECVDATAIOEVNT)) {
  278                 /* user does not want the sndrcv ctl */
  279                 return (NULL);
  280         }
  281         if (sctp_is_feature_on(inp, SCTP_PCB_FLAGS_EXT_RCVINFO)) {
  282                 use_extended = 1;
  283                 len = CMSG_LEN(sizeof(struct sctp_extrcvinfo));
  284         } else {
  285                 len = CMSG_LEN(sizeof(struct sctp_sndrcvinfo));
  286         }
  287 
  288 
  289         ret = sctp_get_mbuf_for_msg(len,
  290             0, M_DONTWAIT, 1, MT_DATA);
  291 
  292         if (ret == NULL) {
  293                 /* No space */
  294                 return (ret);
  295         }
  296         /* We need a CMSG header followed by the struct  */
  297         cmh = mtod(ret, struct cmsghdr *);
  298         outinfo = (struct sctp_sndrcvinfo *)CMSG_DATA(cmh);
  299         cmh->cmsg_level = IPPROTO_SCTP;
  300         if (use_extended) {
  301                 cmh->cmsg_type = SCTP_EXTRCV;
  302                 cmh->cmsg_len = len;
  303                 memcpy(outinfo, sinfo, len);
  304         } else {
  305                 cmh->cmsg_type = SCTP_SNDRCV;
  306                 cmh->cmsg_len = len;
  307                 *outinfo = *sinfo;
  308         }
  309         SCTP_BUF_LEN(ret) = cmh->cmsg_len;
  310         return (ret);
  311 }
  312 
  313 
  314 char *
  315 sctp_build_ctl_cchunk(struct sctp_inpcb *inp,
  316     int *control_len,
  317     struct sctp_sndrcvinfo *sinfo)
  318 {
  319         struct sctp_sndrcvinfo *outinfo;
  320         struct cmsghdr *cmh;
  321         char *buf;
  322         int len;
  323         int use_extended = 0;
  324 
  325         if (sctp_is_feature_off(inp, SCTP_PCB_FLAGS_RECVDATAIOEVNT)) {
  326                 /* user does not want the sndrcv ctl */
  327                 return (NULL);
  328         }
  329         if (sctp_is_feature_on(inp, SCTP_PCB_FLAGS_EXT_RCVINFO)) {
  330                 use_extended = 1;
  331                 len = CMSG_LEN(sizeof(struct sctp_extrcvinfo));
  332         } else {
  333                 len = CMSG_LEN(sizeof(struct sctp_sndrcvinfo));
  334         }
  335         SCTP_MALLOC(buf, char *, len, SCTP_M_CMSG);
  336         if (buf == NULL) {
  337                 /* No space */
  338                 return (buf);
  339         }
  340         /* We need a CMSG header followed by the struct  */
  341         cmh = (struct cmsghdr *)buf;
  342         outinfo = (struct sctp_sndrcvinfo *)CMSG_DATA(cmh);
  343         cmh->cmsg_level = IPPROTO_SCTP;
  344         if (use_extended) {
  345                 cmh->cmsg_type = SCTP_EXTRCV;
  346                 cmh->cmsg_len = len;
  347                 memcpy(outinfo, sinfo, len);
  348         } else {
  349                 cmh->cmsg_type = SCTP_SNDRCV;
  350                 cmh->cmsg_len = len;
  351                 *outinfo = *sinfo;
  352         }
  353         *control_len = len;
  354         return (buf);
  355 }
  356 
  357 
  358 /*
  359  * We are delivering currently from the reassembly queue. We must continue to
  360  * deliver until we either: 1) run out of space. 2) run out of sequential
  361  * TSN's 3) hit the SCTP_DATA_LAST_FRAG flag.
  362  */
  363 static void
  364 sctp_service_reassembly(struct sctp_tcb *stcb, struct sctp_association *asoc)
  365 {
  366         struct sctp_tmit_chunk *chk;
  367         uint16_t nxt_todel;
  368         uint16_t stream_no;
  369         int end = 0;
  370         int cntDel;
  371         struct sctp_queued_to_read *control, *ctl, *ctlat;
  372 
  373         if (stcb == NULL)
  374                 return;
  375 
  376         cntDel = stream_no = 0;
  377         if ((stcb->sctp_ep->sctp_flags & SCTP_PCB_FLAGS_SOCKET_GONE) ||
  378             (stcb->asoc.state & SCTP_STATE_ABOUT_TO_BE_FREED) ||
  379             (stcb->asoc.state & SCTP_STATE_CLOSED_SOCKET)) {
  380                 /* socket above is long gone or going.. */
  381 abandon:
  382                 asoc->fragmented_delivery_inprogress = 0;
  383                 chk = TAILQ_FIRST(&asoc->reasmqueue);
  384                 while (chk) {
  385                         TAILQ_REMOVE(&asoc->reasmqueue, chk, sctp_next);
  386                         asoc->size_on_reasm_queue -= chk->send_size;
  387                         sctp_ucount_decr(asoc->cnt_on_reasm_queue);
  388                         /*
  389                          * Lose the data pointer, since its in the socket
  390                          * buffer
  391                          */
  392                         if (chk->data) {
  393                                 sctp_m_freem(chk->data);
  394                                 chk->data = NULL;
  395                         }
  396                         /* Now free the address and data */
  397                         sctp_free_a_chunk(stcb, chk);
  398                         /* sa_ignore FREED_MEMORY */
  399                         chk = TAILQ_FIRST(&asoc->reasmqueue);
  400                 }
  401                 return;
  402         }
  403         SCTP_TCB_LOCK_ASSERT(stcb);
  404         do {
  405                 chk = TAILQ_FIRST(&asoc->reasmqueue);
  406                 if (chk == NULL) {
  407                         return;
  408                 }
  409                 if (chk->rec.data.TSN_seq != (asoc->tsn_last_delivered + 1)) {
  410                         /* Can't deliver more :< */
  411                         return;
  412                 }
  413                 stream_no = chk->rec.data.stream_number;
  414                 nxt_todel = asoc->strmin[stream_no].last_sequence_delivered + 1;
  415                 if (nxt_todel != chk->rec.data.stream_seq &&
  416                     (chk->rec.data.rcv_flags & SCTP_DATA_UNORDERED) == 0) {
  417                         /*
  418                          * Not the next sequence to deliver in its stream OR
  419                          * unordered
  420                          */
  421                         return;
  422                 }
  423                 if (chk->rec.data.rcv_flags & SCTP_DATA_FIRST_FRAG) {
  424 
  425                         control = sctp_build_readq_entry_chk(stcb, chk);
  426                         if (control == NULL) {
  427                                 /* out of memory? */
  428                                 return;
  429                         }
  430                         /* save it off for our future deliveries */
  431                         stcb->asoc.control_pdapi = control;
  432                         if (chk->rec.data.rcv_flags & SCTP_DATA_LAST_FRAG)
  433                                 end = 1;
  434                         else
  435                                 end = 0;
  436                         sctp_add_to_readq(stcb->sctp_ep,
  437                             stcb, control, &stcb->sctp_socket->so_rcv, end, SCTP_SO_NOT_LOCKED);
  438                         cntDel++;
  439                 } else {
  440                         if (chk->rec.data.rcv_flags & SCTP_DATA_LAST_FRAG)
  441                                 end = 1;
  442                         else
  443                                 end = 0;
  444                         if (sctp_append_to_readq(stcb->sctp_ep, stcb,
  445                             stcb->asoc.control_pdapi,
  446                             chk->data, end, chk->rec.data.TSN_seq,
  447                             &stcb->sctp_socket->so_rcv)) {
  448                                 /*
  449                                  * something is very wrong, either
  450                                  * control_pdapi is NULL, or the tail_mbuf
  451                                  * is corrupt, or there is a EOM already on
  452                                  * the mbuf chain.
  453                                  */
  454                                 if (stcb->asoc.state & SCTP_STATE_ABOUT_TO_BE_FREED) {
  455                                         goto abandon;
  456                                 } else {
  457                                         if ((stcb->asoc.control_pdapi == NULL) || (stcb->asoc.control_pdapi->tail_mbuf == NULL)) {
  458                                                 panic("This should not happen control_pdapi NULL?");
  459                                         }
  460                                         /* if we did not panic, it was a EOM */
  461                                         panic("Bad chunking ??");
  462                                         return;
  463                                 }
  464                         }
  465                         cntDel++;
  466                 }
  467                 /* pull it we did it */
  468                 TAILQ_REMOVE(&asoc->reasmqueue, chk, sctp_next);
  469                 if (chk->rec.data.rcv_flags & SCTP_DATA_LAST_FRAG) {
  470                         asoc->fragmented_delivery_inprogress = 0;
  471                         if ((chk->rec.data.rcv_flags & SCTP_DATA_UNORDERED) == 0) {
  472                                 asoc->strmin[stream_no].last_sequence_delivered++;
  473                         }
  474                         if ((chk->rec.data.rcv_flags & SCTP_DATA_FIRST_FRAG) == 0) {
  475                                 SCTP_STAT_INCR_COUNTER64(sctps_reasmusrmsgs);
  476                         }
  477                 } else if (chk->rec.data.rcv_flags & SCTP_DATA_FIRST_FRAG) {
  478                         /*
  479                          * turn the flag back on since we just  delivered
  480                          * yet another one.
  481                          */
  482                         asoc->fragmented_delivery_inprogress = 1;
  483                 }
  484                 asoc->tsn_of_pdapi_last_delivered = chk->rec.data.TSN_seq;
  485                 asoc->last_flags_delivered = chk->rec.data.rcv_flags;
  486                 asoc->last_strm_seq_delivered = chk->rec.data.stream_seq;
  487                 asoc->last_strm_no_delivered = chk->rec.data.stream_number;
  488 
  489                 asoc->tsn_last_delivered = chk->rec.data.TSN_seq;
  490                 asoc->size_on_reasm_queue -= chk->send_size;
  491                 sctp_ucount_decr(asoc->cnt_on_reasm_queue);
  492                 /* free up the chk */
  493                 chk->data = NULL;
  494                 sctp_free_a_chunk(stcb, chk);
  495 
  496                 if (asoc->fragmented_delivery_inprogress == 0) {
  497                         /*
  498                          * Now lets see if we can deliver the next one on
  499                          * the stream
  500                          */
  501                         struct sctp_stream_in *strm;
  502 
  503                         strm = &asoc->strmin[stream_no];
  504                         nxt_todel = strm->last_sequence_delivered + 1;
  505                         ctl = TAILQ_FIRST(&strm->inqueue);
  506                         if (ctl && (nxt_todel == ctl->sinfo_ssn)) {
  507                                 while (ctl != NULL) {
  508                                         /* Deliver more if we can. */
  509                                         if (nxt_todel == ctl->sinfo_ssn) {
  510                                                 ctlat = TAILQ_NEXT(ctl, next);
  511                                                 TAILQ_REMOVE(&strm->inqueue, ctl, next);
  512                                                 asoc->size_on_all_streams -= ctl->length;
  513                                                 sctp_ucount_decr(asoc->cnt_on_all_streams);
  514                                                 strm->last_sequence_delivered++;
  515                                                 sctp_add_to_readq(stcb->sctp_ep, stcb,
  516                                                     ctl,
  517                                                     &stcb->sctp_socket->so_rcv, 1, SCTP_SO_NOT_LOCKED);
  518                                                 ctl = ctlat;
  519                                         } else {
  520                                                 break;
  521                                         }
  522                                         nxt_todel = strm->last_sequence_delivered + 1;
  523                                 }
  524                         }
  525                         break;
  526                 }
  527                 /* sa_ignore FREED_MEMORY */
  528                 chk = TAILQ_FIRST(&asoc->reasmqueue);
  529         } while (chk);
  530 }
  531 
  532 /*
  533  * Queue the chunk either right into the socket buffer if it is the next one
  534  * to go OR put it in the correct place in the delivery queue.  If we do
  535  * append to the so_buf, keep doing so until we are out of order. One big
  536  * question still remains, what to do when the socket buffer is FULL??
  537  */
  538 static void
  539 sctp_queue_data_to_stream(struct sctp_tcb *stcb, struct sctp_association *asoc,
  540     struct sctp_queued_to_read *control, int *abort_flag)
  541 {
  542         /*
  543          * FIX-ME maybe? What happens when the ssn wraps? If we are getting
  544          * all the data in one stream this could happen quite rapidly. One
  545          * could use the TSN to keep track of things, but this scheme breaks
  546          * down in the other type of stream useage that could occur. Send a
  547          * single msg to stream 0, send 4Billion messages to stream 1, now
  548          * send a message to stream 0. You have a situation where the TSN
  549          * has wrapped but not in the stream. Is this worth worrying about
  550          * or should we just change our queue sort at the bottom to be by
  551          * TSN.
  552          * 
  553          * Could it also be legal for a peer to send ssn 1 with TSN 2 and ssn 2
  554          * with TSN 1? If the peer is doing some sort of funky TSN/SSN
  555          * assignment this could happen... and I don't see how this would be
  556          * a violation. So for now I am undecided an will leave the sort by
  557          * SSN alone. Maybe a hybred approach is the answer
  558          * 
  559          */
  560         struct sctp_stream_in *strm;
  561         struct sctp_queued_to_read *at;
  562         int queue_needed;
  563         uint16_t nxt_todel;
  564         struct mbuf *oper;
  565 
  566         queue_needed = 1;
  567         asoc->size_on_all_streams += control->length;
  568         sctp_ucount_incr(asoc->cnt_on_all_streams);
  569         strm = &asoc->strmin[control->sinfo_stream];
  570         nxt_todel = strm->last_sequence_delivered + 1;
  571         if (sctp_logging_level & SCTP_STR_LOGGING_ENABLE) {
  572                 sctp_log_strm_del(control, NULL, SCTP_STR_LOG_FROM_INTO_STRD);
  573         }
  574         SCTPDBG(SCTP_DEBUG_INDATA1,
  575             "queue to stream called for ssn:%u lastdel:%u nxt:%u\n",
  576             (uint32_t) control->sinfo_stream,
  577             (uint32_t) strm->last_sequence_delivered,
  578             (uint32_t) nxt_todel);
  579         if (compare_with_wrap(strm->last_sequence_delivered,
  580             control->sinfo_ssn, MAX_SEQ) ||
  581             (strm->last_sequence_delivered == control->sinfo_ssn)) {
  582                 /* The incoming sseq is behind where we last delivered? */
  583                 SCTPDBG(SCTP_DEBUG_INDATA1, "Duplicate S-SEQ:%d delivered:%d from peer, Abort  association\n",
  584                     control->sinfo_ssn, strm->last_sequence_delivered);
  585                 /*
  586                  * throw it in the stream so it gets cleaned up in
  587                  * association destruction
  588                  */
  589                 TAILQ_INSERT_HEAD(&strm->inqueue, control, next);
  590                 oper = sctp_get_mbuf_for_msg((sizeof(struct sctp_paramhdr) + 3 * sizeof(uint32_t)),
  591                     0, M_DONTWAIT, 1, MT_DATA);
  592                 if (oper) {
  593                         struct sctp_paramhdr *ph;
  594                         uint32_t *ippp;
  595 
  596                         SCTP_BUF_LEN(oper) = sizeof(struct sctp_paramhdr) +
  597                             (sizeof(uint32_t) * 3);
  598                         ph = mtod(oper, struct sctp_paramhdr *);
  599                         ph->param_type = htons(SCTP_CAUSE_PROTOCOL_VIOLATION);
  600                         ph->param_length = htons(SCTP_BUF_LEN(oper));
  601                         ippp = (uint32_t *) (ph + 1);
  602                         *ippp = htonl(SCTP_FROM_SCTP_INDATA + SCTP_LOC_1);
  603                         ippp++;
  604                         *ippp = control->sinfo_tsn;
  605                         ippp++;
  606                         *ippp = ((control->sinfo_stream << 16) | control->sinfo_ssn);
  607                 }
  608                 stcb->sctp_ep->last_abort_code = SCTP_FROM_SCTP_INDATA + SCTP_LOC_1;
  609                 sctp_abort_an_association(stcb->sctp_ep, stcb,
  610                     SCTP_PEER_FAULTY, oper, SCTP_SO_NOT_LOCKED);
  611 
  612                 *abort_flag = 1;
  613                 return;
  614 
  615         }
  616         if (nxt_todel == control->sinfo_ssn) {
  617                 /* can be delivered right away? */
  618                 if (sctp_logging_level & SCTP_STR_LOGGING_ENABLE) {
  619                         sctp_log_strm_del(control, NULL, SCTP_STR_LOG_FROM_IMMED_DEL);
  620                 }
  621                 queue_needed = 0;
  622                 asoc->size_on_all_streams -= control->length;
  623                 sctp_ucount_decr(asoc->cnt_on_all_streams);
  624                 strm->last_sequence_delivered++;
  625                 sctp_add_to_readq(stcb->sctp_ep, stcb,
  626                     control,
  627                     &stcb->sctp_socket->so_rcv, 1, SCTP_SO_NOT_LOCKED);
  628                 control = TAILQ_FIRST(&strm->inqueue);
  629                 while (control != NULL) {
  630                         /* all delivered */
  631                         nxt_todel = strm->last_sequence_delivered + 1;
  632                         if (nxt_todel == control->sinfo_ssn) {
  633                                 at = TAILQ_NEXT(control, next);
  634                                 TAILQ_REMOVE(&strm->inqueue, control, next);
  635                                 asoc->size_on_all_streams -= control->length;
  636                                 sctp_ucount_decr(asoc->cnt_on_all_streams);
  637                                 strm->last_sequence_delivered++;
  638                                 /*
  639                                  * We ignore the return of deliver_data here
  640                                  * since we always can hold the chunk on the
  641                                  * d-queue. And we have a finite number that
  642                                  * can be delivered from the strq.
  643                                  */
  644                                 if (sctp_logging_level & SCTP_STR_LOGGING_ENABLE) {
  645                                         sctp_log_strm_del(control, NULL,
  646                                             SCTP_STR_LOG_FROM_IMMED_DEL);
  647                                 }
  648                                 sctp_add_to_readq(stcb->sctp_ep, stcb,
  649                                     control,
  650                                     &stcb->sctp_socket->so_rcv, 1, SCTP_SO_NOT_LOCKED);
  651                                 control = at;
  652                                 continue;
  653                         }
  654                         break;
  655                 }
  656         }
  657         if (queue_needed) {
  658                 /*
  659                  * Ok, we did not deliver this guy, find the correct place
  660                  * to put it on the queue.
  661                  */
  662                 if (TAILQ_EMPTY(&strm->inqueue)) {
  663                         /* Empty queue */
  664                         if (sctp_logging_level & SCTP_STR_LOGGING_ENABLE) {
  665                                 sctp_log_strm_del(control, NULL, SCTP_STR_LOG_FROM_INSERT_HD);
  666                         }
  667                         TAILQ_INSERT_HEAD(&strm->inqueue, control, next);
  668                 } else {
  669                         TAILQ_FOREACH(at, &strm->inqueue, next) {
  670                                 if (compare_with_wrap(at->sinfo_ssn,
  671                                     control->sinfo_ssn, MAX_SEQ)) {
  672                                         /*
  673                                          * one in queue is bigger than the
  674                                          * new one, insert before this one
  675                                          */
  676                                         if (sctp_logging_level & SCTP_STR_LOGGING_ENABLE) {
  677                                                 sctp_log_strm_del(control, at,
  678                                                     SCTP_STR_LOG_FROM_INSERT_MD);
  679                                         }
  680                                         TAILQ_INSERT_BEFORE(at, control, next);
  681                                         break;
  682                                 } else if (at->sinfo_ssn == control->sinfo_ssn) {
  683                                         /*
  684                                          * Gak, He sent me a duplicate str
  685                                          * seq number
  686                                          */
  687                                         /*
  688                                          * foo bar, I guess I will just free
  689                                          * this new guy, should we abort
  690                                          * too? FIX ME MAYBE? Or it COULD be
  691                                          * that the SSN's have wrapped.
  692                                          * Maybe I should compare to TSN
  693                                          * somehow... sigh for now just blow
  694                                          * away the chunk!
  695                                          */
  696 
  697                                         if (control->data)
  698                                                 sctp_m_freem(control->data);
  699                                         control->data = NULL;
  700                                         asoc->size_on_all_streams -= control->length;
  701                                         sctp_ucount_decr(asoc->cnt_on_all_streams);
  702                                         if (control->whoFrom)
  703                                                 sctp_free_remote_addr(control->whoFrom);
  704                                         control->whoFrom = NULL;
  705                                         sctp_free_a_readq(stcb, control);
  706                                         return;
  707                                 } else {
  708                                         if (TAILQ_NEXT(at, next) == NULL) {
  709                                                 /*
  710                                                  * We are at the end, insert
  711                                                  * it after this one
  712                                                  */
  713                                                 if (sctp_logging_level & SCTP_STR_LOGGING_ENABLE) {
  714                                                         sctp_log_strm_del(control, at,
  715                                                             SCTP_STR_LOG_FROM_INSERT_TL);
  716                                                 }
  717                                                 TAILQ_INSERT_AFTER(&strm->inqueue,
  718                                                     at, control, next);
  719                                                 break;
  720                                         }
  721                                 }
  722                         }
  723                 }
  724         }
  725 }
  726 
  727 /*
  728  * Returns two things: You get the total size of the deliverable parts of the
  729  * first fragmented message on the reassembly queue. And you get a 1 back if
  730  * all of the message is ready or a 0 back if the message is still incomplete
  731  */
  732 static int
  733 sctp_is_all_msg_on_reasm(struct sctp_association *asoc, uint32_t * t_size)
  734 {
  735         struct sctp_tmit_chunk *chk;
  736         uint32_t tsn;
  737 
  738         *t_size = 0;
  739         chk = TAILQ_FIRST(&asoc->reasmqueue);
  740         if (chk == NULL) {
  741                 /* nothing on the queue */
  742                 return (0);
  743         }
  744         if ((chk->rec.data.rcv_flags & SCTP_DATA_FIRST_FRAG) == 0) {
  745                 /* Not a first on the queue */
  746                 return (0);
  747         }
  748         tsn = chk->rec.data.TSN_seq;
  749         while (chk) {
  750                 if (tsn != chk->rec.data.TSN_seq) {
  751                         return (0);
  752                 }
  753                 *t_size += chk->send_size;
  754                 if (chk->rec.data.rcv_flags & SCTP_DATA_LAST_FRAG) {
  755                         return (1);
  756                 }
  757                 tsn++;
  758                 chk = TAILQ_NEXT(chk, sctp_next);
  759         }
  760         return (0);
  761 }
  762 
  763 static void
  764 sctp_deliver_reasm_check(struct sctp_tcb *stcb, struct sctp_association *asoc)
  765 {
  766         struct sctp_tmit_chunk *chk;
  767         uint16_t nxt_todel;
  768         uint32_t tsize;
  769 
  770 doit_again:
  771         chk = TAILQ_FIRST(&asoc->reasmqueue);
  772         if (chk == NULL) {
  773                 /* Huh? */
  774                 asoc->size_on_reasm_queue = 0;
  775                 asoc->cnt_on_reasm_queue = 0;
  776                 return;
  777         }
  778         if (asoc->fragmented_delivery_inprogress == 0) {
  779                 nxt_todel =
  780                     asoc->strmin[chk->rec.data.stream_number].last_sequence_delivered + 1;
  781                 if ((chk->rec.data.rcv_flags & SCTP_DATA_FIRST_FRAG) &&
  782                     (nxt_todel == chk->rec.data.stream_seq ||
  783                     (chk->rec.data.rcv_flags & SCTP_DATA_UNORDERED))) {
  784                         /*
  785                          * Yep the first one is here and its ok to deliver
  786                          * but should we?
  787                          */
  788                         if ((sctp_is_all_msg_on_reasm(asoc, &tsize) ||
  789                             (tsize >= stcb->sctp_ep->partial_delivery_point))) {
  790 
  791                                 /*
  792                                  * Yes, we setup to start reception, by
  793                                  * backing down the TSN just in case we
  794                                  * can't deliver. If we
  795                                  */
  796                                 asoc->fragmented_delivery_inprogress = 1;
  797                                 asoc->tsn_last_delivered =
  798                                     chk->rec.data.TSN_seq - 1;
  799                                 asoc->str_of_pdapi =
  800                                     chk->rec.data.stream_number;
  801                                 asoc->ssn_of_pdapi = chk->rec.data.stream_seq;
  802                                 asoc->pdapi_ppid = chk->rec.data.payloadtype;
  803                                 asoc->fragment_flags = chk->rec.data.rcv_flags;
  804                                 sctp_service_reassembly(stcb, asoc);
  805                         }
  806                 }
  807         } else {
  808                 /*
  809                  * Service re-assembly will deliver stream data queued at
  810                  * the end of fragmented delivery.. but it wont know to go
  811                  * back and call itself again... we do that here with the
  812                  * got doit_again
  813                  */
  814                 sctp_service_reassembly(stcb, asoc);
  815                 if (asoc->fragmented_delivery_inprogress == 0) {
  816                         /*
  817                          * finished our Fragmented delivery, could be more
  818                          * waiting?
  819                          */
  820                         goto doit_again;
  821                 }
  822         }
  823 }
  824 
  825 /*
  826  * Dump onto the re-assembly queue, in its proper place. After dumping on the
  827  * queue, see if anthing can be delivered. If so pull it off (or as much as
  828  * we can. If we run out of space then we must dump what we can and set the
  829  * appropriate flag to say we queued what we could.
  830  */
  831 static void
  832 sctp_queue_data_for_reasm(struct sctp_tcb *stcb, struct sctp_association *asoc,
  833     struct sctp_tmit_chunk *chk, int *abort_flag)
  834 {
  835         struct mbuf *oper;
  836         uint32_t cum_ackp1, last_tsn, prev_tsn, post_tsn;
  837         u_char last_flags;
  838         struct sctp_tmit_chunk *at, *prev, *next;
  839 
  840         prev = next = NULL;
  841         cum_ackp1 = asoc->tsn_last_delivered + 1;
  842         if (TAILQ_EMPTY(&asoc->reasmqueue)) {
  843                 /* This is the first one on the queue */
  844                 TAILQ_INSERT_HEAD(&asoc->reasmqueue, chk, sctp_next);
  845                 /*
  846                  * we do not check for delivery of anything when only one
  847                  * fragment is here
  848                  */
  849                 asoc->size_on_reasm_queue = chk->send_size;
  850                 sctp_ucount_incr(asoc->cnt_on_reasm_queue);
  851                 if (chk->rec.data.TSN_seq == cum_ackp1) {
  852                         if (asoc->fragmented_delivery_inprogress == 0 &&
  853                             (chk->rec.data.rcv_flags & SCTP_DATA_FIRST_FRAG) !=
  854                             SCTP_DATA_FIRST_FRAG) {
  855                                 /*
  856                                  * An empty queue, no delivery inprogress,
  857                                  * we hit the next one and it does NOT have
  858                                  * a FIRST fragment mark.
  859                                  */
  860                                 SCTPDBG(SCTP_DEBUG_INDATA1, "Gak, Evil plot, its not first, no fragmented delivery in progress\n");
  861                                 oper = sctp_get_mbuf_for_msg((sizeof(struct sctp_paramhdr) + 3 * sizeof(uint32_t)),
  862                                     0, M_DONTWAIT, 1, MT_DATA);
  863 
  864                                 if (oper) {
  865                                         struct sctp_paramhdr *ph;
  866                                         uint32_t *ippp;
  867 
  868                                         SCTP_BUF_LEN(oper) =
  869                                             sizeof(struct sctp_paramhdr) +
  870                                             (sizeof(uint32_t) * 3);
  871                                         ph = mtod(oper, struct sctp_paramhdr *);
  872                                         ph->param_type =
  873                                             htons(SCTP_CAUSE_PROTOCOL_VIOLATION);
  874                                         ph->param_length = htons(SCTP_BUF_LEN(oper));
  875                                         ippp = (uint32_t *) (ph + 1);
  876                                         *ippp = htonl(SCTP_FROM_SCTP_INDATA + SCTP_LOC_2);
  877                                         ippp++;
  878                                         *ippp = chk->rec.data.TSN_seq;
  879                                         ippp++;
  880                                         *ippp = ((chk->rec.data.stream_number << 16) | chk->rec.data.stream_seq);
  881 
  882                                 }
  883                                 stcb->sctp_ep->last_abort_code = SCTP_FROM_SCTP_INDATA + SCTP_LOC_2;
  884                                 sctp_abort_an_association(stcb->sctp_ep, stcb,
  885                                     SCTP_PEER_FAULTY, oper, SCTP_SO_NOT_LOCKED);
  886                                 *abort_flag = 1;
  887                         } else if (asoc->fragmented_delivery_inprogress &&
  888                             (chk->rec.data.rcv_flags & SCTP_DATA_FIRST_FRAG) == SCTP_DATA_FIRST_FRAG) {
  889                                 /*
  890                                  * We are doing a partial delivery and the
  891                                  * NEXT chunk MUST be either the LAST or
  892                                  * MIDDLE fragment NOT a FIRST
  893                                  */
  894                                 SCTPDBG(SCTP_DEBUG_INDATA1, "Gak, Evil plot, it IS a first and fragmented delivery in progress\n");
  895                                 oper = sctp_get_mbuf_for_msg((sizeof(struct sctp_paramhdr) + 3 * sizeof(uint32_t)),
  896                                     0, M_DONTWAIT, 1, MT_DATA);
  897                                 if (oper) {
  898                                         struct sctp_paramhdr *ph;
  899                                         uint32_t *ippp;
  900 
  901                                         SCTP_BUF_LEN(oper) =
  902                                             sizeof(struct sctp_paramhdr) +
  903                                             (3 * sizeof(uint32_t));
  904                                         ph = mtod(oper, struct sctp_paramhdr *);
  905                                         ph->param_type =
  906                                             htons(SCTP_CAUSE_PROTOCOL_VIOLATION);
  907                                         ph->param_length = htons(SCTP_BUF_LEN(oper));
  908                                         ippp = (uint32_t *) (ph + 1);
  909                                         *ippp = htonl(SCTP_FROM_SCTP_INDATA + SCTP_LOC_3);
  910                                         ippp++;
  911                                         *ippp = chk->rec.data.TSN_seq;
  912                                         ippp++;
  913                                         *ippp = ((chk->rec.data.stream_number << 16) | chk->rec.data.stream_seq);
  914                                 }
  915                                 stcb->sctp_ep->last_abort_code = SCTP_FROM_SCTP_INDATA + SCTP_LOC_3;
  916                                 sctp_abort_an_association(stcb->sctp_ep, stcb,
  917                                     SCTP_PEER_FAULTY, oper, SCTP_SO_NOT_LOCKED);
  918                                 *abort_flag = 1;
  919                         } else if (asoc->fragmented_delivery_inprogress) {
  920                                 /*
  921                                  * Here we are ok with a MIDDLE or LAST
  922                                  * piece
  923                                  */
  924                                 if (chk->rec.data.stream_number !=
  925                                     asoc->str_of_pdapi) {
  926                                         /* Got to be the right STR No */
  927                                         SCTPDBG(SCTP_DEBUG_INDATA1, "Gak, Evil plot, it IS not same stream number %d vs %d\n",
  928                                             chk->rec.data.stream_number,
  929                                             asoc->str_of_pdapi);
  930                                         oper = sctp_get_mbuf_for_msg((sizeof(struct sctp_paramhdr) + 3 * sizeof(uint32_t)),
  931                                             0, M_DONTWAIT, 1, MT_DATA);
  932                                         if (oper) {
  933                                                 struct sctp_paramhdr *ph;
  934                                                 uint32_t *ippp;
  935 
  936                                                 SCTP_BUF_LEN(oper) =
  937                                                     sizeof(struct sctp_paramhdr) +
  938                                                     (sizeof(uint32_t) * 3);
  939                                                 ph = mtod(oper,
  940                                                     struct sctp_paramhdr *);
  941                                                 ph->param_type =
  942                                                     htons(SCTP_CAUSE_PROTOCOL_VIOLATION);
  943                                                 ph->param_length =
  944                                                     htons(SCTP_BUF_LEN(oper));
  945                                                 ippp = (uint32_t *) (ph + 1);
  946                                                 *ippp = htonl(SCTP_FROM_SCTP_INDATA + SCTP_LOC_4);
  947                                                 ippp++;
  948                                                 *ippp = chk->rec.data.TSN_seq;
  949                                                 ippp++;
  950                                                 *ippp = ((chk->rec.data.stream_number << 16) | chk->rec.data.stream_seq);
  951                                         }
  952                                         stcb->sctp_ep->last_abort_code = SCTP_FROM_SCTP_INDATA + SCTP_LOC_4;
  953                                         sctp_abort_an_association(stcb->sctp_ep,
  954                                             stcb, SCTP_PEER_FAULTY, oper, SCTP_SO_NOT_LOCKED);
  955                                         *abort_flag = 1;
  956                                 } else if ((asoc->fragment_flags & SCTP_DATA_UNORDERED) !=
  957                                             SCTP_DATA_UNORDERED &&
  958                                             chk->rec.data.stream_seq !=
  959                                     asoc->ssn_of_pdapi) {
  960                                         /* Got to be the right STR Seq */
  961                                         SCTPDBG(SCTP_DEBUG_INDATA1, "Gak, Evil plot, it IS not same stream seq %d vs %d\n",
  962                                             chk->rec.data.stream_seq,
  963                                             asoc->ssn_of_pdapi);
  964                                         oper = sctp_get_mbuf_for_msg((sizeof(struct sctp_paramhdr) + 3 * sizeof(uint32_t)),
  965                                             0, M_DONTWAIT, 1, MT_DATA);
  966                                         if (oper) {
  967                                                 struct sctp_paramhdr *ph;
  968                                                 uint32_t *ippp;
  969 
  970                                                 SCTP_BUF_LEN(oper) =
  971                                                     sizeof(struct sctp_paramhdr) +
  972                                                     (3 * sizeof(uint32_t));
  973                                                 ph = mtod(oper,
  974                                                     struct sctp_paramhdr *);
  975                                                 ph->param_type =
  976                                                     htons(SCTP_CAUSE_PROTOCOL_VIOLATION);
  977                                                 ph->param_length =
  978                                                     htons(SCTP_BUF_LEN(oper));
  979                                                 ippp = (uint32_t *) (ph + 1);
  980                                                 *ippp = htonl(SCTP_FROM_SCTP_INDATA + SCTP_LOC_5);
  981                                                 ippp++;
  982                                                 *ippp = chk->rec.data.TSN_seq;
  983                                                 ippp++;
  984                                                 *ippp = ((chk->rec.data.stream_number << 16) | chk->rec.data.stream_seq);
  985 
  986                                         }
  987                                         stcb->sctp_ep->last_abort_code = SCTP_FROM_SCTP_INDATA + SCTP_LOC_5;
  988                                         sctp_abort_an_association(stcb->sctp_ep,
  989                                             stcb, SCTP_PEER_FAULTY, oper, SCTP_SO_NOT_LOCKED);
  990                                         *abort_flag = 1;
  991                                 }
  992                         }
  993                 }
  994                 return;
  995         }
  996         /* Find its place */
  997         TAILQ_FOREACH(at, &asoc->reasmqueue, sctp_next) {
  998                 if (compare_with_wrap(at->rec.data.TSN_seq,
  999                     chk->rec.data.TSN_seq, MAX_TSN)) {
 1000                         /*
 1001                          * one in queue is bigger than the new one, insert
 1002                          * before this one
 1003                          */
 1004                         /* A check */
 1005                         asoc->size_on_reasm_queue += chk->send_size;
 1006                         sctp_ucount_incr(asoc->cnt_on_reasm_queue);
 1007                         next = at;
 1008                         TAILQ_INSERT_BEFORE(at, chk, sctp_next);
 1009                         break;
 1010                 } else if (at->rec.data.TSN_seq == chk->rec.data.TSN_seq) {
 1011                         /* Gak, He sent me a duplicate str seq number */
 1012                         /*
 1013                          * foo bar, I guess I will just free this new guy,
 1014                          * should we abort too? FIX ME MAYBE? Or it COULD be
 1015                          * that the SSN's have wrapped. Maybe I should
 1016                          * compare to TSN somehow... sigh for now just blow
 1017                          * away the chunk!
 1018                          */
 1019                         if (chk->data) {
 1020                                 sctp_m_freem(chk->data);
 1021                                 chk->data = NULL;
 1022                         }
 1023                         sctp_free_a_chunk(stcb, chk);
 1024                         return;
 1025                 } else {
 1026                         last_flags = at->rec.data.rcv_flags;
 1027                         last_tsn = at->rec.data.TSN_seq;
 1028                         prev = at;
 1029                         if (TAILQ_NEXT(at, sctp_next) == NULL) {
 1030                                 /*
 1031                                  * We are at the end, insert it after this
 1032                                  * one
 1033                                  */
 1034                                 /* check it first */
 1035                                 asoc->size_on_reasm_queue += chk->send_size;
 1036                                 sctp_ucount_incr(asoc->cnt_on_reasm_queue);
 1037                                 TAILQ_INSERT_AFTER(&asoc->reasmqueue, at, chk, sctp_next);
 1038                                 break;
 1039                         }
 1040                 }
 1041         }
 1042         /* Now the audits */
 1043         if (prev) {
 1044                 prev_tsn = chk->rec.data.TSN_seq - 1;
 1045                 if (prev_tsn == prev->rec.data.TSN_seq) {
 1046                         /*
 1047                          * Ok the one I am dropping onto the end is the
 1048                          * NEXT. A bit of valdiation here.
 1049                          */
 1050                         if ((prev->rec.data.rcv_flags & SCTP_DATA_FRAG_MASK) ==
 1051                             SCTP_DATA_FIRST_FRAG ||
 1052                             (prev->rec.data.rcv_flags & SCTP_DATA_FRAG_MASK) ==
 1053                             SCTP_DATA_MIDDLE_FRAG) {
 1054                                 /*
 1055                                  * Insert chk MUST be a MIDDLE or LAST
 1056                                  * fragment
 1057                                  */
 1058                                 if ((chk->rec.data.rcv_flags & SCTP_DATA_FRAG_MASK) ==
 1059                                     SCTP_DATA_FIRST_FRAG) {
 1060                                         SCTPDBG(SCTP_DEBUG_INDATA1, "Prev check - It can be a midlle or last but not a first\n");
 1061                                         SCTPDBG(SCTP_DEBUG_INDATA1, "Gak, Evil plot, it's a FIRST!\n");
 1062                                         oper = sctp_get_mbuf_for_msg((sizeof(struct sctp_paramhdr) + 3 * sizeof(uint32_t)),
 1063                                             0, M_DONTWAIT, 1, MT_DATA);
 1064                                         if (oper) {
 1065                                                 struct sctp_paramhdr *ph;
 1066                                                 uint32_t *ippp;
 1067 
 1068                                                 SCTP_BUF_LEN(oper) =
 1069                                                     sizeof(struct sctp_paramhdr) +
 1070                                                     (3 * sizeof(uint32_t));
 1071                                                 ph = mtod(oper,
 1072                                                     struct sctp_paramhdr *);
 1073                                                 ph->param_type =
 1074                                                     htons(SCTP_CAUSE_PROTOCOL_VIOLATION);
 1075                                                 ph->param_length =
 1076                                                     htons(SCTP_BUF_LEN(oper));
 1077                                                 ippp = (uint32_t *) (ph + 1);
 1078                                                 *ippp = htonl(SCTP_FROM_SCTP_INDATA + SCTP_LOC_6);
 1079                                                 ippp++;
 1080                                                 *ippp = chk->rec.data.TSN_seq;
 1081                                                 ippp++;
 1082                                                 *ippp = ((chk->rec.data.stream_number << 16) | chk->rec.data.stream_seq);
 1083 
 1084                                         }
 1085                                         stcb->sctp_ep->last_abort_code = SCTP_FROM_SCTP_INDATA + SCTP_LOC_6;
 1086                                         sctp_abort_an_association(stcb->sctp_ep,
 1087                                             stcb, SCTP_PEER_FAULTY, oper, SCTP_SO_NOT_LOCKED);
 1088                                         *abort_flag = 1;
 1089                                         return;
 1090                                 }
 1091                                 if (chk->rec.data.stream_number !=
 1092                                     prev->rec.data.stream_number) {
 1093                                         /*
 1094                                          * Huh, need the correct STR here,
 1095                                          * they must be the same.
 1096                                          */
 1097                                         SCTP_PRINTF("Prev check - Gak, Evil plot, ssn:%d not the same as at:%d\n",
 1098                                             chk->rec.data.stream_number,
 1099                                             prev->rec.data.stream_number);
 1100                                         oper = sctp_get_mbuf_for_msg((sizeof(struct sctp_paramhdr) + 3 * sizeof(uint32_t)),
 1101                                             0, M_DONTWAIT, 1, MT_DATA);
 1102                                         if (oper) {
 1103                                                 struct sctp_paramhdr *ph;
 1104                                                 uint32_t *ippp;
 1105 
 1106                                                 SCTP_BUF_LEN(oper) =
 1107                                                     sizeof(struct sctp_paramhdr) +
 1108                                                     (3 * sizeof(uint32_t));
 1109                                                 ph = mtod(oper,
 1110                                                     struct sctp_paramhdr *);
 1111                                                 ph->param_type =
 1112                                                     htons(SCTP_CAUSE_PROTOCOL_VIOLATION);
 1113                                                 ph->param_length =
 1114                                                     htons(SCTP_BUF_LEN(oper));
 1115                                                 ippp = (uint32_t *) (ph + 1);
 1116                                                 *ippp = htonl(SCTP_FROM_SCTP_INDATA + SCTP_LOC_7);
 1117                                                 ippp++;
 1118                                                 *ippp = chk->rec.data.TSN_seq;
 1119                                                 ippp++;
 1120                                                 *ippp = ((chk->rec.data.stream_number << 16) | chk->rec.data.stream_seq);
 1121                                         }
 1122                                         stcb->sctp_ep->last_abort_code = SCTP_FROM_SCTP_INDATA + SCTP_LOC_7;
 1123                                         sctp_abort_an_association(stcb->sctp_ep,
 1124                                             stcb, SCTP_PEER_FAULTY, oper, SCTP_SO_NOT_LOCKED);
 1125 
 1126                                         *abort_flag = 1;
 1127                                         return;
 1128                                 }
 1129                                 if ((prev->rec.data.rcv_flags & SCTP_DATA_UNORDERED) == 0 &&
 1130                                     chk->rec.data.stream_seq !=
 1131                                     prev->rec.data.stream_seq) {
 1132                                         /*
 1133                                          * Huh, need the correct STR here,
 1134                                          * they must be the same.
 1135                                          */
 1136                                         SCTPDBG(SCTP_DEBUG_INDATA1, "Prev check - Gak, Evil plot, sseq:%d not the same as at:%d\n",
 1137                                             chk->rec.data.stream_seq,
 1138                                             prev->rec.data.stream_seq);
 1139                                         oper = sctp_get_mbuf_for_msg((sizeof(struct sctp_paramhdr) + 3 * sizeof(uint32_t)),
 1140                                             0, M_DONTWAIT, 1, MT_DATA);
 1141                                         if (oper) {
 1142                                                 struct sctp_paramhdr *ph;
 1143                                                 uint32_t *ippp;
 1144 
 1145                                                 SCTP_BUF_LEN(oper) =
 1146                                                     sizeof(struct sctp_paramhdr) +
 1147                                                     (3 * sizeof(uint32_t));
 1148                                                 ph = mtod(oper,
 1149                                                     struct sctp_paramhdr *);
 1150                                                 ph->param_type =
 1151                                                     htons(SCTP_CAUSE_PROTOCOL_VIOLATION);
 1152                                                 ph->param_length =
 1153                                                     htons(SCTP_BUF_LEN(oper));
 1154                                                 ippp = (uint32_t *) (ph + 1);
 1155                                                 *ippp = htonl(SCTP_FROM_SCTP_INDATA + SCTP_LOC_8);
 1156                                                 ippp++;
 1157                                                 *ippp = chk->rec.data.TSN_seq;
 1158                                                 ippp++;
 1159                                                 *ippp = ((chk->rec.data.stream_number << 16) | chk->rec.data.stream_seq);
 1160                                         }
 1161                                         stcb->sctp_ep->last_abort_code = SCTP_FROM_SCTP_INDATA + SCTP_LOC_8;
 1162                                         sctp_abort_an_association(stcb->sctp_ep,
 1163                                             stcb, SCTP_PEER_FAULTY, oper, SCTP_SO_NOT_LOCKED);
 1164 
 1165                                         *abort_flag = 1;
 1166                                         return;
 1167                                 }
 1168                         } else if ((prev->rec.data.rcv_flags & SCTP_DATA_FRAG_MASK) ==
 1169                             SCTP_DATA_LAST_FRAG) {
 1170                                 /* Insert chk MUST be a FIRST */
 1171                                 if ((chk->rec.data.rcv_flags & SCTP_DATA_FRAG_MASK) !=
 1172                                     SCTP_DATA_FIRST_FRAG) {
 1173                                         SCTPDBG(SCTP_DEBUG_INDATA1, "Prev check - Gak, evil plot, its not FIRST and it must be!\n");
 1174                                         oper = sctp_get_mbuf_for_msg((sizeof(struct sctp_paramhdr) + 3 * sizeof(uint32_t)),
 1175                                             0, M_DONTWAIT, 1, MT_DATA);
 1176                                         if (oper) {
 1177                                                 struct sctp_paramhdr *ph;
 1178                                                 uint32_t *ippp;
 1179 
 1180                                                 SCTP_BUF_LEN(oper) =
 1181                                                     sizeof(struct sctp_paramhdr) +
 1182                                                     (3 * sizeof(uint32_t));
 1183                                                 ph = mtod(oper,
 1184                                                     struct sctp_paramhdr *);
 1185                                                 ph->param_type =
 1186                                                     htons(SCTP_CAUSE_PROTOCOL_VIOLATION);
 1187                                                 ph->param_length =
 1188                                                     htons(SCTP_BUF_LEN(oper));
 1189                                                 ippp = (uint32_t *) (ph + 1);
 1190                                                 *ippp = htonl(SCTP_FROM_SCTP_INDATA + SCTP_LOC_9);
 1191                                                 ippp++;
 1192                                                 *ippp = chk->rec.data.TSN_seq;
 1193                                                 ippp++;
 1194                                                 *ippp = ((chk->rec.data.stream_number << 16) | chk->rec.data.stream_seq);
 1195 
 1196                                         }
 1197                                         stcb->sctp_ep->last_abort_code = SCTP_FROM_SCTP_INDATA + SCTP_LOC_9;
 1198                                         sctp_abort_an_association(stcb->sctp_ep,
 1199                                             stcb, SCTP_PEER_FAULTY, oper, SCTP_SO_NOT_LOCKED);
 1200 
 1201                                         *abort_flag = 1;
 1202                                         return;
 1203                                 }
 1204                         }
 1205                 }
 1206         }
 1207         if (next) {
 1208                 post_tsn = chk->rec.data.TSN_seq + 1;
 1209                 if (post_tsn == next->rec.data.TSN_seq) {
 1210                         /*
 1211                          * Ok the one I am inserting ahead of is my NEXT
 1212                          * one. A bit of valdiation here.
 1213                          */
 1214                         if (next->rec.data.rcv_flags & SCTP_DATA_FIRST_FRAG) {
 1215                                 /* Insert chk MUST be a last fragment */
 1216                                 if ((chk->rec.data.rcv_flags & SCTP_DATA_FRAG_MASK)
 1217                                     != SCTP_DATA_LAST_FRAG) {
 1218                                         SCTPDBG(SCTP_DEBUG_INDATA1, "Next chk - Next is FIRST, we must be LAST\n");
 1219                                         SCTPDBG(SCTP_DEBUG_INDATA1, "Gak, Evil plot, its not a last!\n");
 1220                                         oper = sctp_get_mbuf_for_msg((sizeof(struct sctp_paramhdr) + 3 * sizeof(uint32_t)),
 1221                                             0, M_DONTWAIT, 1, MT_DATA);
 1222                                         if (oper) {
 1223                                                 struct sctp_paramhdr *ph;
 1224                                                 uint32_t *ippp;
 1225 
 1226                                                 SCTP_BUF_LEN(oper) =
 1227                                                     sizeof(struct sctp_paramhdr) +
 1228                                                     (3 * sizeof(uint32_t));
 1229                                                 ph = mtod(oper,
 1230                                                     struct sctp_paramhdr *);
 1231                                                 ph->param_type =
 1232                                                     htons(SCTP_CAUSE_PROTOCOL_VIOLATION);
 1233                                                 ph->param_length =
 1234                                                     htons(SCTP_BUF_LEN(oper));
 1235                                                 ippp = (uint32_t *) (ph + 1);
 1236                                                 *ippp = htonl(SCTP_FROM_SCTP_INDATA + SCTP_LOC_10);
 1237                                                 ippp++;
 1238                                                 *ippp = chk->rec.data.TSN_seq;
 1239                                                 ippp++;
 1240                                                 *ippp = ((chk->rec.data.stream_number << 16) | chk->rec.data.stream_seq);
 1241                                         }
 1242                                         stcb->sctp_ep->last_abort_code = SCTP_FROM_SCTP_INDATA + SCTP_LOC_10;
 1243                                         sctp_abort_an_association(stcb->sctp_ep,
 1244                                             stcb, SCTP_PEER_FAULTY, oper, SCTP_SO_NOT_LOCKED);
 1245 
 1246                                         *abort_flag = 1;
 1247                                         return;
 1248                                 }
 1249                         } else if ((next->rec.data.rcv_flags & SCTP_DATA_FRAG_MASK) ==
 1250                                     SCTP_DATA_MIDDLE_FRAG ||
 1251                                     (next->rec.data.rcv_flags & SCTP_DATA_FRAG_MASK) ==
 1252                             SCTP_DATA_LAST_FRAG) {
 1253                                 /*
 1254                                  * Insert chk CAN be MIDDLE or FIRST NOT
 1255                                  * LAST
 1256                                  */
 1257                                 if ((chk->rec.data.rcv_flags & SCTP_DATA_FRAG_MASK) ==
 1258                                     SCTP_DATA_LAST_FRAG) {
 1259                                         SCTPDBG(SCTP_DEBUG_INDATA1, "Next chk - Next is a MIDDLE/LAST\n");
 1260                                         SCTPDBG(SCTP_DEBUG_INDATA1, "Gak, Evil plot, new prev chunk is a LAST\n");
 1261                                         oper = sctp_get_mbuf_for_msg((sizeof(struct sctp_paramhdr) + 3 * sizeof(uint32_t)),
 1262                                             0, M_DONTWAIT, 1, MT_DATA);
 1263                                         if (oper) {
 1264                                                 struct sctp_paramhdr *ph;
 1265                                                 uint32_t *ippp;
 1266 
 1267                                                 SCTP_BUF_LEN(oper) =
 1268                                                     sizeof(struct sctp_paramhdr) +
 1269                                                     (3 * sizeof(uint32_t));
 1270                                                 ph = mtod(oper,
 1271                                                     struct sctp_paramhdr *);
 1272                                                 ph->param_type =
 1273                                                     htons(SCTP_CAUSE_PROTOCOL_VIOLATION);
 1274                                                 ph->param_length =
 1275                                                     htons(SCTP_BUF_LEN(oper));
 1276                                                 ippp = (uint32_t *) (ph + 1);
 1277                                                 *ippp = htonl(SCTP_FROM_SCTP_INDATA + SCTP_LOC_11);
 1278                                                 ippp++;
 1279                                                 *ippp = chk->rec.data.TSN_seq;
 1280                                                 ippp++;
 1281                                                 *ippp = ((chk->rec.data.stream_number << 16) | chk->rec.data.stream_seq);
 1282 
 1283                                         }
 1284                                         stcb->sctp_ep->last_abort_code = SCTP_FROM_SCTP_INDATA + SCTP_LOC_11;
 1285                                         sctp_abort_an_association(stcb->sctp_ep,
 1286                                             stcb, SCTP_PEER_FAULTY, oper, SCTP_SO_NOT_LOCKED);
 1287 
 1288                                         *abort_flag = 1;
 1289                                         return;
 1290                                 }
 1291                                 if (chk->rec.data.stream_number !=
 1292                                     next->rec.data.stream_number) {
 1293                                         /*
 1294                                          * Huh, need the correct STR here,
 1295                                          * they must be the same.
 1296                                          */
 1297                                         SCTPDBG(SCTP_DEBUG_INDATA1, "Next chk - Gak, Evil plot, ssn:%d not the same as at:%d\n",
 1298                                             chk->rec.data.stream_number,
 1299                                             next->rec.data.stream_number);
 1300                                         oper = sctp_get_mbuf_for_msg((sizeof(struct sctp_paramhdr) + 3 * sizeof(uint32_t)),
 1301                                             0, M_DONTWAIT, 1, MT_DATA);
 1302                                         if (oper) {
 1303                                                 struct sctp_paramhdr *ph;
 1304                                                 uint32_t *ippp;
 1305 
 1306                                                 SCTP_BUF_LEN(oper) =
 1307                                                     sizeof(struct sctp_paramhdr) +
 1308                                                     (3 * sizeof(uint32_t));
 1309                                                 ph = mtod(oper,
 1310                                                     struct sctp_paramhdr *);
 1311                                                 ph->param_type =
 1312                                                     htons(SCTP_CAUSE_PROTOCOL_VIOLATION);
 1313                                                 ph->param_length =
 1314                                                     htons(SCTP_BUF_LEN(oper));
 1315                                                 ippp = (uint32_t *) (ph + 1);
 1316                                                 *ippp = htonl(SCTP_FROM_SCTP_INDATA + SCTP_LOC_12);
 1317                                                 ippp++;
 1318                                                 *ippp = chk->rec.data.TSN_seq;
 1319                                                 ippp++;
 1320                                                 *ippp = ((chk->rec.data.stream_number << 16) | chk->rec.data.stream_seq);
 1321 
 1322                                         }
 1323                                         stcb->sctp_ep->last_abort_code = SCTP_FROM_SCTP_INDATA + SCTP_LOC_12;
 1324                                         sctp_abort_an_association(stcb->sctp_ep,
 1325                                             stcb, SCTP_PEER_FAULTY, oper, SCTP_SO_NOT_LOCKED);
 1326 
 1327                                         *abort_flag = 1;
 1328                                         return;
 1329                                 }
 1330                                 if ((next->rec.data.rcv_flags & SCTP_DATA_UNORDERED) == 0 &&
 1331                                     chk->rec.data.stream_seq !=
 1332                                     next->rec.data.stream_seq) {
 1333                                         /*
 1334                                          * Huh, need the correct STR here,
 1335                                          * they must be the same.
 1336                                          */
 1337                                         SCTPDBG(SCTP_DEBUG_INDATA1, "Next chk - Gak, Evil plot, sseq:%d not the same as at:%d\n",
 1338                                             chk->rec.data.stream_seq,
 1339                                             next->rec.data.stream_seq);
 1340                                         oper = sctp_get_mbuf_for_msg((sizeof(struct sctp_paramhdr) + 3 * sizeof(uint32_t)),
 1341                                             0, M_DONTWAIT, 1, MT_DATA);
 1342                                         if (oper) {
 1343                                                 struct sctp_paramhdr *ph;
 1344                                                 uint32_t *ippp;
 1345 
 1346                                                 SCTP_BUF_LEN(oper) =
 1347                                                     sizeof(struct sctp_paramhdr) +
 1348                                                     (3 * sizeof(uint32_t));
 1349                                                 ph = mtod(oper,
 1350                                                     struct sctp_paramhdr *);
 1351                                                 ph->param_type =
 1352                                                     htons(SCTP_CAUSE_PROTOCOL_VIOLATION);
 1353                                                 ph->param_length =
 1354                                                     htons(SCTP_BUF_LEN(oper));
 1355                                                 ippp = (uint32_t *) (ph + 1);
 1356                                                 *ippp = htonl(SCTP_FROM_SCTP_INDATA + SCTP_LOC_13);
 1357                                                 ippp++;
 1358                                                 *ippp = chk->rec.data.TSN_seq;
 1359                                                 ippp++;
 1360                                                 *ippp = ((chk->rec.data.stream_number << 16) | chk->rec.data.stream_seq);
 1361                                         }
 1362                                         stcb->sctp_ep->last_abort_code = SCTP_FROM_SCTP_INDATA + SCTP_LOC_13;
 1363                                         sctp_abort_an_association(stcb->sctp_ep,
 1364                                             stcb, SCTP_PEER_FAULTY, oper, SCTP_SO_NOT_LOCKED);
 1365 
 1366                                         *abort_flag = 1;
 1367                                         return;
 1368                                 }
 1369                         }
 1370                 }
 1371         }
 1372         /* Do we need to do some delivery? check */
 1373         sctp_deliver_reasm_check(stcb, asoc);
 1374 }
 1375 
 1376 /*
 1377  * This is an unfortunate routine. It checks to make sure a evil guy is not
 1378  * stuffing us full of bad packet fragments. A broken peer could also do this
 1379  * but this is doubtful. It is to bad I must worry about evil crackers sigh
 1380  * :< more cycles.
 1381  */
 1382 static int
 1383 sctp_does_tsn_belong_to_reasm(struct sctp_association *asoc,
 1384     uint32_t TSN_seq)
 1385 {
 1386         struct sctp_tmit_chunk *at;
 1387         uint32_t tsn_est;
 1388 
 1389         TAILQ_FOREACH(at, &asoc->reasmqueue, sctp_next) {
 1390                 if (compare_with_wrap(TSN_seq,
 1391                     at->rec.data.TSN_seq, MAX_TSN)) {
 1392                         /* is it one bigger? */
 1393                         tsn_est = at->rec.data.TSN_seq + 1;
 1394                         if (tsn_est == TSN_seq) {
 1395                                 /* yep. It better be a last then */
 1396                                 if ((at->rec.data.rcv_flags & SCTP_DATA_FRAG_MASK) !=
 1397                                     SCTP_DATA_LAST_FRAG) {
 1398                                         /*
 1399                                          * Ok this guy belongs next to a guy
 1400                                          * that is NOT last, it should be a
 1401                                          * middle/last, not a complete
 1402                                          * chunk.
 1403                                          */
 1404                                         return (1);
 1405                                 } else {
 1406                                         /*
 1407                                          * This guy is ok since its a LAST
 1408                                          * and the new chunk is a fully
 1409                                          * self- contained one.
 1410                                          */
 1411                                         return (0);
 1412                                 }
 1413                         }
 1414                 } else if (TSN_seq == at->rec.data.TSN_seq) {
 1415                         /* Software error since I have a dup? */
 1416                         return (1);
 1417                 } else {
 1418                         /*
 1419                          * Ok, 'at' is larger than new chunk but does it
 1420                          * need to be right before it.
 1421                          */
 1422                         tsn_est = TSN_seq + 1;
 1423                         if (tsn_est == at->rec.data.TSN_seq) {
 1424                                 /* Yep, It better be a first */
 1425                                 if ((at->rec.data.rcv_flags & SCTP_DATA_FRAG_MASK) !=
 1426                                     SCTP_DATA_FIRST_FRAG) {
 1427                                         return (1);
 1428                                 } else {
 1429                                         return (0);
 1430                                 }
 1431                         }
 1432                 }
 1433         }
 1434         return (0);
 1435 }
 1436 
 1437 
 1438 static int
 1439 sctp_process_a_data_chunk(struct sctp_tcb *stcb, struct sctp_association *asoc,
 1440     struct mbuf **m, int offset, struct sctp_data_chunk *ch, int chk_length,
 1441     struct sctp_nets *net, uint32_t * high_tsn, int *abort_flag,
 1442     int *break_flag, int last_chunk)
 1443 {
 1444         /* Process a data chunk */
 1445         /* struct sctp_tmit_chunk *chk; */
 1446         struct sctp_tmit_chunk *chk;
 1447         uint32_t tsn, gap;
 1448         struct mbuf *dmbuf;
 1449         int indx, the_len;
 1450         int need_reasm_check = 0;
 1451         uint16_t strmno, strmseq;
 1452         struct mbuf *oper;
 1453         struct sctp_queued_to_read *control;
 1454         int ordered;
 1455         uint32_t protocol_id;
 1456         uint8_t chunk_flags;
 1457         struct sctp_stream_reset_list *liste;
 1458 
 1459         chk = NULL;
 1460         tsn = ntohl(ch->dp.tsn);
 1461         chunk_flags = ch->ch.chunk_flags;
 1462         protocol_id = ch->dp.protocol_id;
 1463         ordered = ((ch->ch.chunk_flags & SCTP_DATA_UNORDERED) == 0);
 1464         if (sctp_logging_level & SCTP_MAP_LOGGING_ENABLE) {
 1465                 sctp_log_map(tsn, asoc->cumulative_tsn, asoc->highest_tsn_inside_map, SCTP_MAP_TSN_ENTERS);
 1466         }
 1467         if (stcb == NULL) {
 1468                 return (0);
 1469         }
 1470         SCTP_LTRACE_CHK(stcb->sctp_ep, stcb, ch->ch.chunk_type, tsn);
 1471         if (compare_with_wrap(asoc->cumulative_tsn, tsn, MAX_TSN) ||
 1472             asoc->cumulative_tsn == tsn) {
 1473                 /* It is a duplicate */
 1474                 SCTP_STAT_INCR(sctps_recvdupdata);
 1475                 if (asoc->numduptsns < SCTP_MAX_DUP_TSNS) {
 1476                         /* Record a dup for the next outbound sack */
 1477                         asoc->dup_tsns[asoc->numduptsns] = tsn;
 1478                         asoc->numduptsns++;
 1479                 }
 1480                 asoc->send_sack = 1;
 1481                 return (0);
 1482         }
 1483         /* Calculate the number of TSN's between the base and this TSN */
 1484         if (tsn >= asoc->mapping_array_base_tsn) {
 1485                 gap = tsn - asoc->mapping_array_base_tsn;
 1486         } else {
 1487                 gap = (MAX_TSN - asoc->mapping_array_base_tsn) + tsn + 1;
 1488         }
 1489         if (gap >= (SCTP_MAPPING_ARRAY << 3)) {
 1490                 /* Can't hold the bit in the mapping at max array, toss it */
 1491                 return (0);
 1492         }
 1493         if (gap >= (uint32_t) (asoc->mapping_array_size << 3)) {
 1494                 SCTP_TCB_LOCK_ASSERT(stcb);
 1495                 if (sctp_expand_mapping_array(asoc, gap)) {
 1496                         /* Can't expand, drop it */
 1497                         return (0);
 1498                 }
 1499         }
 1500         if (compare_with_wrap(tsn, *high_tsn, MAX_TSN)) {
 1501                 *high_tsn = tsn;
 1502         }
 1503         /* See if we have received this one already */
 1504         if (SCTP_IS_TSN_PRESENT(asoc->mapping_array, gap)) {
 1505                 SCTP_STAT_INCR(sctps_recvdupdata);
 1506                 if (asoc->numduptsns < SCTP_MAX_DUP_TSNS) {
 1507                         /* Record a dup for the next outbound sack */
 1508                         asoc->dup_tsns[asoc->numduptsns] = tsn;
 1509                         asoc->numduptsns++;
 1510                 }
 1511                 asoc->send_sack = 1;
 1512                 return (0);
 1513         }
 1514         /*
 1515          * Check to see about the GONE flag, duplicates would cause a sack
 1516          * to be sent up above
 1517          */
 1518         if (((stcb->sctp_ep->sctp_flags & SCTP_PCB_FLAGS_SOCKET_GONE) ||
 1519             (stcb->sctp_ep->sctp_flags & SCTP_PCB_FLAGS_SOCKET_ALLGONE) ||
 1520             (stcb->asoc.state & SCTP_STATE_CLOSED_SOCKET))
 1521             ) {
 1522                 /*
 1523                  * wait a minute, this guy is gone, there is no longer a
 1524                  * receiver. Send peer an ABORT!
 1525                  */
 1526                 struct mbuf *op_err;
 1527 
 1528                 op_err = sctp_generate_invmanparam(SCTP_CAUSE_OUT_OF_RESC);
 1529                 sctp_abort_an_association(stcb->sctp_ep, stcb, 0, op_err, SCTP_SO_NOT_LOCKED);
 1530                 *abort_flag = 1;
 1531                 return (0);
 1532         }
 1533         /*
 1534          * Now before going further we see if there is room. If NOT then we
 1535          * MAY let one through only IF this TSN is the one we are waiting
 1536          * for on a partial delivery API.
 1537          */
 1538 
 1539         /* now do the tests */
 1540         if (((asoc->cnt_on_all_streams +
 1541             asoc->cnt_on_reasm_queue +
 1542             asoc->cnt_msg_on_sb) > sctp_max_chunks_on_queue) ||
 1543             (((int)asoc->my_rwnd) <= 0)) {
 1544                 /*
 1545                  * When we have NO room in the rwnd we check to make sure
 1546                  * the reader is doing its job...
 1547                  */
 1548                 if (stcb->sctp_socket->so_rcv.sb_cc) {
 1549                         /* some to read, wake-up */
 1550 #if defined (__APPLE__) || defined(SCTP_SO_LOCK_TESTING)
 1551                         struct socket *so;
 1552 
 1553                         so = SCTP_INP_SO(stcb->sctp_ep);
 1554                         atomic_add_int(&stcb->asoc.refcnt, 1);
 1555                         SCTP_TCB_UNLOCK(stcb);
 1556                         SCTP_SOCKET_LOCK(so, 1);
 1557                         SCTP_TCB_LOCK(stcb);
 1558                         atomic_subtract_int(&stcb->asoc.refcnt, 1);
 1559                         if (stcb->asoc.state & SCTP_STATE_CLOSED_SOCKET) {
 1560                                 /* assoc was freed while we were unlocked */
 1561                                 SCTP_SOCKET_UNLOCK(so, 1);
 1562                                 return (0);
 1563                         }
 1564 #endif
 1565                         sctp_sorwakeup(stcb->sctp_ep, stcb->sctp_socket);
 1566 #if defined (__APPLE__) || defined(SCTP_SO_LOCK_TESTING)
 1567                         SCTP_SOCKET_UNLOCK(so, 1);
 1568 #endif
 1569                 }
 1570                 /* now is it in the mapping array of what we have accepted? */
 1571                 if (compare_with_wrap(tsn,
 1572                     asoc->highest_tsn_inside_map, MAX_TSN)) {
 1573 
 1574                         /* Nope not in the valid range dump it */
 1575                         sctp_set_rwnd(stcb, asoc);
 1576                         if ((asoc->cnt_on_all_streams +
 1577                             asoc->cnt_on_reasm_queue +
 1578                             asoc->cnt_msg_on_sb) > sctp_max_chunks_on_queue) {
 1579                                 SCTP_STAT_INCR(sctps_datadropchklmt);
 1580                         } else {
 1581                                 SCTP_STAT_INCR(sctps_datadroprwnd);
 1582                         }
 1583                         indx = *break_flag;
 1584                         *break_flag = 1;
 1585                         return (0);
 1586                 }
 1587         }
 1588         strmno = ntohs(ch->dp.stream_id);
 1589         if (strmno >= asoc->streamincnt) {
 1590                 struct sctp_paramhdr *phdr;
 1591                 struct mbuf *mb;
 1592 
 1593                 mb = sctp_get_mbuf_for_msg((sizeof(struct sctp_paramhdr) * 2),
 1594                     0, M_DONTWAIT, 1, MT_DATA);
 1595                 if (mb != NULL) {
 1596                         /* add some space up front so prepend will work well */
 1597                         SCTP_BUF_RESV_UF(mb, sizeof(struct sctp_chunkhdr));
 1598                         phdr = mtod(mb, struct sctp_paramhdr *);
 1599                         /*
 1600                          * Error causes are just param's and this one has
 1601                          * two back to back phdr, one with the error type
 1602                          * and size, the other with the streamid and a rsvd
 1603                          */
 1604                         SCTP_BUF_LEN(mb) = (sizeof(struct sctp_paramhdr) * 2);
 1605                         phdr->param_type = htons(SCTP_CAUSE_INVALID_STREAM);
 1606                         phdr->param_length =
 1607                             htons(sizeof(struct sctp_paramhdr) * 2);
 1608                         phdr++;
 1609                         /* We insert the stream in the type field */
 1610                         phdr->param_type = ch->dp.stream_id;
 1611                         /* And set the length to 0 for the rsvd field */
 1612                         phdr->param_length = 0;
 1613                         sctp_queue_op_err(stcb, mb);
 1614                 }
 1615                 SCTP_STAT_INCR(sctps_badsid);
 1616                 SCTP_TCB_LOCK_ASSERT(stcb);
 1617                 SCTP_SET_TSN_PRESENT(asoc->mapping_array, gap);
 1618                 if (compare_with_wrap(tsn, asoc->highest_tsn_inside_map, MAX_TSN)) {
 1619                         /* we have a new high score */
 1620                         asoc->highest_tsn_inside_map = tsn;
 1621                         if (sctp_logging_level & SCTP_MAP_LOGGING_ENABLE) {
 1622                                 sctp_log_map(0, 2, asoc->highest_tsn_inside_map, SCTP_MAP_SLIDE_RESULT);
 1623                         }
 1624                 }
 1625                 if (tsn == (asoc->cumulative_tsn + 1)) {
 1626                         /* Update cum-ack */
 1627                         asoc->cumulative_tsn = tsn;
 1628                 }
 1629                 return (0);
 1630         }
 1631         /*
 1632          * Before we continue lets validate that we are not being fooled by
 1633          * an evil attacker. We can only have 4k chunks based on our TSN
 1634          * spread allowed by the mapping array 512 * 8 bits, so there is no
 1635          * way our stream sequence numbers could have wrapped. We of course
 1636          * only validate the FIRST fragment so the bit must be set.
 1637          */
 1638         strmseq = ntohs(ch->dp.stream_sequence);
 1639 #ifdef SCTP_ASOCLOG_OF_TSNS
 1640         SCTP_TCB_LOCK_ASSERT(stcb);
 1641         if (asoc->tsn_in_at >= SCTP_TSN_LOG_SIZE) {
 1642                 asoc->tsn_in_at = 0;
 1643                 asoc->tsn_in_wrapped = 1;
 1644         }
 1645         asoc->in_tsnlog[asoc->tsn_in_at].tsn = tsn;
 1646         asoc->in_tsnlog[asoc->tsn_in_at].strm = strmno;
 1647         asoc->in_tsnlog[asoc->tsn_in_at].seq = strmseq;
 1648         asoc->in_tsnlog[asoc->tsn_in_at].sz = chk_length;
 1649         asoc->in_tsnlog[asoc->tsn_in_at].flgs = chunk_flags;
 1650         asoc->in_tsnlog[asoc->tsn_in_at].stcb = (void *)stcb;
 1651         asoc->in_tsnlog[asoc->tsn_in_at].in_pos = asoc->tsn_in_at;
 1652         asoc->in_tsnlog[asoc->tsn_in_at].in_out = 1;
 1653         asoc->tsn_in_at++;
 1654 #endif
 1655         if ((chunk_flags & SCTP_DATA_FIRST_FRAG) &&
 1656             (TAILQ_EMPTY(&asoc->resetHead)) &&
 1657             (chunk_flags & SCTP_DATA_UNORDERED) == 0 &&
 1658             (compare_with_wrap(asoc->strmin[strmno].last_sequence_delivered,
 1659             strmseq, MAX_SEQ) ||
 1660             asoc->strmin[strmno].last_sequence_delivered == strmseq)) {
 1661                 /* The incoming sseq is behind where we last delivered? */
 1662                 SCTPDBG(SCTP_DEBUG_INDATA1, "EVIL/Broken-Dup S-SEQ:%d delivered:%d from peer, Abort!\n",
 1663                     strmseq, asoc->strmin[strmno].last_sequence_delivered);
 1664                 oper = sctp_get_mbuf_for_msg((sizeof(struct sctp_paramhdr) + 3 * sizeof(uint32_t)),
 1665                     0, M_DONTWAIT, 1, MT_DATA);
 1666                 if (oper) {
 1667                         struct sctp_paramhdr *ph;
 1668                         uint32_t *ippp;
 1669 
 1670                         SCTP_BUF_LEN(oper) = sizeof(struct sctp_paramhdr) +
 1671                             (3 * sizeof(uint32_t));
 1672                         ph = mtod(oper, struct sctp_paramhdr *);
 1673                         ph->param_type = htons(SCTP_CAUSE_PROTOCOL_VIOLATION);
 1674                         ph->param_length = htons(SCTP_BUF_LEN(oper));
 1675                         ippp = (uint32_t *) (ph + 1);
 1676                         *ippp = htonl(SCTP_FROM_SCTP_INDATA + SCTP_LOC_14);
 1677                         ippp++;
 1678                         *ippp = tsn;
 1679                         ippp++;
 1680                         *ippp = ((strmno << 16) | strmseq);
 1681 
 1682                 }
 1683                 stcb->sctp_ep->last_abort_code = SCTP_FROM_SCTP_INDATA + SCTP_LOC_14;
 1684                 sctp_abort_an_association(stcb->sctp_ep, stcb,
 1685                     SCTP_PEER_FAULTY, oper, SCTP_SO_NOT_LOCKED);
 1686                 *abort_flag = 1;
 1687                 return (0);
 1688         }
 1689         /************************************
 1690          * From here down we may find ch-> invalid
 1691          * so its a good idea NOT to use it.
 1692          *************************************/
 1693 
 1694         the_len = (chk_length - sizeof(struct sctp_data_chunk));
 1695         if (last_chunk == 0) {
 1696                 dmbuf = SCTP_M_COPYM(*m,
 1697                     (offset + sizeof(struct sctp_data_chunk)),
 1698                     the_len, M_DONTWAIT);
 1699 #ifdef SCTP_MBUF_LOGGING
 1700                 if (sctp_logging_level & SCTP_MBUF_LOGGING_ENABLE) {
 1701                         struct mbuf *mat;
 1702 
 1703                         mat = dmbuf;
 1704                         while (mat) {
 1705                                 if (SCTP_BUF_IS_EXTENDED(mat)) {
 1706                                         sctp_log_mb(mat, SCTP_MBUF_ICOPY);
 1707                                 }
 1708                                 mat = SCTP_BUF_NEXT(mat);
 1709                         }
 1710                 }
 1711 #endif
 1712         } else {
 1713                 /* We can steal the last chunk */
 1714                 int l_len;
 1715 
 1716                 dmbuf = *m;
 1717                 /* lop off the top part */
 1718                 m_adj(dmbuf, (offset + sizeof(struct sctp_data_chunk)));
 1719                 if (SCTP_BUF_NEXT(dmbuf) == NULL) {
 1720                         l_len = SCTP_BUF_LEN(dmbuf);
 1721                 } else {
 1722                         /*
 1723                          * need to count up the size hopefully does not hit
 1724                          * this to often :-0
 1725                          */
 1726                         struct mbuf *lat;
 1727 
 1728                         l_len = 0;
 1729                         lat = dmbuf;
 1730                         while (lat) {
 1731                                 l_len += SCTP_BUF_LEN(lat);
 1732                                 lat = SCTP_BUF_NEXT(lat);
 1733                         }
 1734                 }
 1735                 if (l_len > the_len) {
 1736                         /* Trim the end round bytes off  too */
 1737                         m_adj(dmbuf, -(l_len - the_len));
 1738                 }
 1739         }
 1740         if (dmbuf == NULL) {
 1741                 SCTP_STAT_INCR(sctps_nomem);
 1742                 return (0);
 1743         }
 1744         if ((chunk_flags & SCTP_DATA_NOT_FRAG) == SCTP_DATA_NOT_FRAG &&
 1745             asoc->fragmented_delivery_inprogress == 0 &&
 1746             TAILQ_EMPTY(&asoc->resetHead) &&
 1747             ((ordered == 0) ||
 1748             ((asoc->strmin[strmno].last_sequence_delivered + 1) == strmseq &&
 1749             TAILQ_EMPTY(&asoc->strmin[strmno].inqueue)))) {
 1750                 /* Candidate for express delivery */
 1751                 /*
 1752                  * Its not fragmented, No PD-API is up, Nothing in the
 1753                  * delivery queue, Its un-ordered OR ordered and the next to
 1754                  * deliver AND nothing else is stuck on the stream queue,
 1755                  * And there is room for it in the socket buffer. Lets just
 1756                  * stuff it up the buffer....
 1757                  */
 1758 
 1759                 /* It would be nice to avoid this copy if we could :< */
 1760                 sctp_alloc_a_readq(stcb, control);
 1761                 sctp_build_readq_entry_mac(control, stcb, asoc->context, net, tsn,
 1762                     protocol_id,
 1763                     stcb->asoc.context,
 1764                     strmno, strmseq,
 1765                     chunk_flags,
 1766                     dmbuf);
 1767                 if (control == NULL) {
 1768                         goto failed_express_del;
 1769                 }
 1770                 sctp_add_to_readq(stcb->sctp_ep, stcb, control, &stcb->sctp_socket->so_rcv, 1, SCTP_SO_NOT_LOCKED);
 1771                 if ((chunk_flags & SCTP_DATA_UNORDERED) == 0) {
 1772                         /* for ordered, bump what we delivered */
 1773                         asoc->strmin[strmno].last_sequence_delivered++;
 1774                 }
 1775                 SCTP_STAT_INCR(sctps_recvexpress);
 1776                 if (sctp_logging_level & SCTP_STR_LOGGING_ENABLE) {
 1777                         sctp_log_strm_del_alt(stcb, tsn, strmseq, strmno,
 1778                             SCTP_STR_LOG_FROM_EXPRS_DEL);
 1779                 }
 1780                 control = NULL;
 1781                 goto finish_express_del;
 1782         }
 1783 failed_express_del:
 1784         /* If we reach here this is a new chunk */
 1785         chk = NULL;
 1786         control = NULL;
 1787         /* Express for fragmented delivery? */
 1788         if ((asoc->fragmented_delivery_inprogress) &&
 1789             (stcb->asoc.control_pdapi) &&
 1790             (asoc->str_of_pdapi == strmno) &&
 1791             (asoc->ssn_of_pdapi == strmseq)
 1792             ) {
 1793                 control = stcb->asoc.control_pdapi;
 1794                 if ((chunk_flags & SCTP_DATA_FIRST_FRAG) == SCTP_DATA_FIRST_FRAG) {
 1795                         /* Can't be another first? */
 1796                         goto failed_pdapi_express_del;
 1797                 }
 1798                 if (tsn == (control->sinfo_tsn + 1)) {
 1799                         /* Yep, we can add it on */
 1800                         int end = 0;
 1801                         uint32_t cumack;
 1802 
 1803                         if (chunk_flags & SCTP_DATA_LAST_FRAG) {
 1804                                 end = 1;
 1805                         }
 1806                         cumack = asoc->cumulative_tsn;
 1807                         if ((cumack + 1) == tsn)
 1808                                 cumack = tsn;
 1809 
 1810                         if (sctp_append_to_readq(stcb->sctp_ep, stcb, control, dmbuf, end,
 1811                             tsn,
 1812                             &stcb->sctp_socket->so_rcv)) {
 1813                                 SCTP_PRINTF("Append fails end:%d\n", end);
 1814                                 goto failed_pdapi_express_del;
 1815                         }
 1816                         SCTP_STAT_INCR(sctps_recvexpressm);
 1817                         control->sinfo_tsn = tsn;
 1818                         asoc->tsn_last_delivered = tsn;
 1819                         asoc->fragment_flags = chunk_flags;
 1820                         asoc->tsn_of_pdapi_last_delivered = tsn;
 1821                         asoc->last_flags_delivered = chunk_flags;
 1822                         asoc->last_strm_seq_delivered = strmseq;
 1823                         asoc->last_strm_no_delivered = strmno;
 1824                         if (end) {
 1825                                 /* clean up the flags and such */
 1826                                 asoc->fragmented_delivery_inprogress = 0;
 1827                                 if ((chunk_flags & SCTP_DATA_UNORDERED) == 0) {
 1828                                         asoc->strmin[strmno].last_sequence_delivered++;
 1829                                 }
 1830                                 stcb->asoc.control_pdapi = NULL;
 1831                                 if (TAILQ_EMPTY(&asoc->reasmqueue) == 0) {
 1832                                         /*
 1833                                          * There could be another message
 1834                                          * ready
 1835                                          */
 1836                                         need_reasm_check = 1;
 1837                                 }
 1838                         }
 1839                         control = NULL;
 1840                         goto finish_express_del;
 1841                 }
 1842         }
 1843 failed_pdapi_express_del:
 1844         control = NULL;
 1845         if ((chunk_flags & SCTP_DATA_NOT_FRAG) != SCTP_DATA_NOT_FRAG) {
 1846                 sctp_alloc_a_chunk(stcb, chk);
 1847                 if (chk == NULL) {
 1848                         /* No memory so we drop the chunk */
 1849                         SCTP_STAT_INCR(sctps_nomem);
 1850                         if (last_chunk == 0) {
 1851                                 /* we copied it, free the copy */
 1852                                 sctp_m_freem(dmbuf);
 1853                         }
 1854                         return (0);
 1855                 }
 1856                 chk->rec.data.TSN_seq = tsn;
 1857                 chk->no_fr_allowed = 0;
 1858                 chk->rec.data.stream_seq = strmseq;
 1859                 chk->rec.data.stream_number = strmno;
 1860                 chk->rec.data.payloadtype = protocol_id;
 1861                 chk->rec.data.context = stcb->asoc.context;
 1862                 chk->rec.data.doing_fast_retransmit = 0;
 1863                 chk->rec.data.rcv_flags = chunk_flags;
 1864                 chk->asoc = asoc;
 1865                 chk->send_size = the_len;
 1866                 chk->whoTo = net;
 1867                 atomic_add_int(&net->ref_count, 1);
 1868                 chk->data = dmbuf;
 1869         } else {
 1870                 sctp_alloc_a_readq(stcb, control);
 1871                 sctp_build_readq_entry_mac(control, stcb, asoc->context, net, tsn,
 1872                     protocol_id,
 1873                     stcb->asoc.context,
 1874                     strmno, strmseq,
 1875                     chunk_flags,
 1876                     dmbuf);
 1877                 if (control == NULL) {
 1878                         /* No memory so we drop the chunk */
 1879                         SCTP_STAT_INCR(sctps_nomem);
 1880                         if (last_chunk == 0) {
 1881                                 /* we copied it, free the copy */
 1882                                 sctp_m_freem(dmbuf);
 1883                         }
 1884                         return (0);
 1885                 }
 1886                 control->length = the_len;
 1887         }
 1888 
 1889         /* Mark it as received */
 1890         /* Now queue it where it belongs */
 1891         if (control != NULL) {
 1892                 /* First a sanity check */
 1893                 if (asoc->fragmented_delivery_inprogress) {
 1894                         /*
 1895                          * Ok, we have a fragmented delivery in progress if
 1896                          * this chunk is next to deliver OR belongs in our
 1897                          * view to the reassembly, the peer is evil or
 1898                          * broken.
 1899                          */
 1900                         uint32_t estimate_tsn;
 1901 
 1902                         estimate_tsn = asoc->tsn_last_delivered + 1;
 1903                         if (TAILQ_EMPTY(&asoc->reasmqueue) &&
 1904                             (estimate_tsn == control->sinfo_tsn)) {
 1905                                 /* Evil/Broke peer */
 1906                                 sctp_m_freem(control->data);
 1907                                 control->data = NULL;
 1908                                 if (control->whoFrom) {
 1909                                         sctp_free_remote_addr(control->whoFrom);
 1910                                         control->whoFrom = NULL;
 1911                                 }
 1912                                 sctp_free_a_readq(stcb, control);
 1913                                 oper = sctp_get_mbuf_for_msg((sizeof(struct sctp_paramhdr) + 3 * sizeof(uint32_t)),
 1914                                     0, M_DONTWAIT, 1, MT_DATA);
 1915                                 if (oper) {
 1916                                         struct sctp_paramhdr *ph;
 1917                                         uint32_t *ippp;
 1918 
 1919                                         SCTP_BUF_LEN(oper) =
 1920                                             sizeof(struct sctp_paramhdr) +
 1921                                             (3 * sizeof(uint32_t));
 1922                                         ph = mtod(oper, struct sctp_paramhdr *);
 1923                                         ph->param_type =
 1924                                             htons(SCTP_CAUSE_PROTOCOL_VIOLATION);
 1925                                         ph->param_length = htons(SCTP_BUF_LEN(oper));
 1926                                         ippp = (uint32_t *) (ph + 1);
 1927                                         *ippp = htonl(SCTP_FROM_SCTP_INDATA + SCTP_LOC_15);
 1928                                         ippp++;
 1929                                         *ippp = tsn;
 1930                                         ippp++;
 1931                                         *ippp = ((strmno << 16) | strmseq);
 1932                                 }
 1933                                 stcb->sctp_ep->last_abort_code = SCTP_FROM_SCTP_INDATA + SCTP_LOC_15;
 1934                                 sctp_abort_an_association(stcb->sctp_ep, stcb,
 1935                                     SCTP_PEER_FAULTY, oper, SCTP_SO_NOT_LOCKED);
 1936 
 1937                                 *abort_flag = 1;
 1938                                 return (0);
 1939                         } else {
 1940                                 if (sctp_does_tsn_belong_to_reasm(asoc, control->sinfo_tsn)) {
 1941                                         sctp_m_freem(control->data);
 1942                                         control->data = NULL;
 1943                                         if (control->whoFrom) {
 1944                                                 sctp_free_remote_addr(control->whoFrom);
 1945                                                 control->whoFrom = NULL;
 1946                                         }
 1947                                         sctp_free_a_readq(stcb, control);
 1948 
 1949                                         oper = sctp_get_mbuf_for_msg((sizeof(struct sctp_paramhdr) + 3 * sizeof(uint32_t)),
 1950                                             0, M_DONTWAIT, 1, MT_DATA);
 1951                                         if (oper) {
 1952                                                 struct sctp_paramhdr *ph;
 1953                                                 uint32_t *ippp;
 1954 
 1955                                                 SCTP_BUF_LEN(oper) =
 1956                                                     sizeof(struct sctp_paramhdr) +
 1957                                                     (3 * sizeof(uint32_t));
 1958                                                 ph = mtod(oper,
 1959                                                     struct sctp_paramhdr *);
 1960                                                 ph->param_type =
 1961                                                     htons(SCTP_CAUSE_PROTOCOL_VIOLATION);
 1962                                                 ph->param_length =
 1963                                                     htons(SCTP_BUF_LEN(oper));
 1964                                                 ippp = (uint32_t *) (ph + 1);
 1965                                                 *ippp = htonl(SCTP_FROM_SCTP_INDATA + SCTP_LOC_16);
 1966                                                 ippp++;
 1967                                                 *ippp = tsn;
 1968                                                 ippp++;
 1969                                                 *ippp = ((strmno << 16) | strmseq);
 1970                                         }
 1971                                         stcb->sctp_ep->last_abort_code = SCTP_FROM_SCTP_INDATA + SCTP_LOC_16;
 1972                                         sctp_abort_an_association(stcb->sctp_ep,
 1973                                             stcb, SCTP_PEER_FAULTY, oper, SCTP_SO_NOT_LOCKED);
 1974 
 1975                                         *abort_flag = 1;
 1976                                         return (0);
 1977                                 }
 1978                         }
 1979                 } else {
 1980                         /* No PDAPI running */
 1981                         if (!TAILQ_EMPTY(&asoc->reasmqueue)) {
 1982                                 /*
 1983                                  * Reassembly queue is NOT empty validate
 1984                                  * that this tsn does not need to be in
 1985                                  * reasembly queue. If it does then our peer
 1986                                  * is broken or evil.
 1987                                  */
 1988                                 if (sctp_does_tsn_belong_to_reasm(asoc, control->sinfo_tsn)) {
 1989                                         sctp_m_freem(control->data);
 1990                                         control->data = NULL;
 1991                                         if (control->whoFrom) {
 1992                                                 sctp_free_remote_addr(control->whoFrom);
 1993                                                 control->whoFrom = NULL;
 1994                                         }
 1995                                         sctp_free_a_readq(stcb, control);
 1996                                         oper = sctp_get_mbuf_for_msg((sizeof(struct sctp_paramhdr) + 3 * sizeof(uint32_t)),
 1997                                             0, M_DONTWAIT, 1, MT_DATA);
 1998                                         if (oper) {
 1999                                                 struct sctp_paramhdr *ph;
 2000                                                 uint32_t *ippp;
 2001 
 2002                                                 SCTP_BUF_LEN(oper) =
 2003                                                     sizeof(struct sctp_paramhdr) +
 2004                                                     (3 * sizeof(uint32_t));
 2005                                                 ph = mtod(oper,
 2006                                                     struct sctp_paramhdr *);
 2007                                                 ph->param_type =
 2008                                                     htons(SCTP_CAUSE_PROTOCOL_VIOLATION);
 2009                                                 ph->param_length =
 2010                                                     htons(SCTP_BUF_LEN(oper));
 2011                                                 ippp = (uint32_t *) (ph + 1);
 2012                                                 *ippp = htonl(SCTP_FROM_SCTP_INDATA + SCTP_LOC_17);
 2013                                                 ippp++;
 2014                                                 *ippp = tsn;
 2015                                                 ippp++;
 2016                                                 *ippp = ((strmno << 16) | strmseq);
 2017                                         }
 2018                                         stcb->sctp_ep->last_abort_code = SCTP_FROM_SCTP_INDATA + SCTP_LOC_17;
 2019                                         sctp_abort_an_association(stcb->sctp_ep,
 2020                                             stcb, SCTP_PEER_FAULTY, oper, SCTP_SO_NOT_LOCKED);
 2021 
 2022                                         *abort_flag = 1;
 2023                                         return (0);
 2024                                 }
 2025                         }
 2026                 }
 2027                 /* ok, if we reach here we have passed the sanity checks */
 2028                 if (chunk_flags & SCTP_DATA_UNORDERED) {
 2029                         /* queue directly into socket buffer */
 2030                         sctp_add_to_readq(stcb->sctp_ep, stcb,
 2031                             control,
 2032                             &stcb->sctp_socket->so_rcv, 1, SCTP_SO_NOT_LOCKED);
 2033                 } else {
 2034                         /*
 2035                          * Special check for when streams are resetting. We
 2036                          * could be more smart about this and check the
 2037                          * actual stream to see if it is not being reset..
 2038                          * that way we would not create a HOLB when amongst
 2039                          * streams being reset and those not being reset.
 2040                          * 
 2041                          * We take complete messages that have a stream reset
 2042                          * intervening (aka the TSN is after where our
 2043                          * cum-ack needs to be) off and put them on a
 2044                          * pending_reply_queue. The reassembly ones we do
 2045                          * not have to worry about since they are all sorted
 2046                          * and proceessed by TSN order. It is only the
 2047                          * singletons I must worry about.
 2048                          */
 2049                         if (((liste = TAILQ_FIRST(&asoc->resetHead)) != NULL) &&
 2050                             ((compare_with_wrap(tsn, liste->tsn, MAX_TSN)))
 2051                             ) {
 2052                                 /*
 2053                                  * yep its past where we need to reset... go
 2054                                  * ahead and queue it.
 2055                                  */
 2056                                 if (TAILQ_EMPTY(&asoc->pending_reply_queue)) {
 2057                                         /* first one on */
 2058                                         TAILQ_INSERT_TAIL(&asoc->pending_reply_queue, control, next);
 2059                                 } else {
 2060                                         struct sctp_queued_to_read *ctlOn;
 2061                                         unsigned char inserted = 0;
 2062 
 2063                                         ctlOn = TAILQ_FIRST(&asoc->pending_reply_queue);
 2064                                         while (ctlOn) {
 2065                                                 if (compare_with_wrap(control->sinfo_tsn,
 2066                                                     ctlOn->sinfo_tsn, MAX_TSN)) {
 2067                                                         ctlOn = TAILQ_NEXT(ctlOn, next);
 2068                                                 } else {
 2069                                                         /* found it */
 2070                                                         TAILQ_INSERT_BEFORE(ctlOn, control, next);
 2071                                                         inserted = 1;
 2072                                                         break;
 2073                                                 }
 2074                                         }
 2075                                         if (inserted == 0) {
 2076                                                 /*
 2077                                                  * must be put at end, use
 2078                                                  * prevP (all setup from
 2079                                                  * loop) to setup nextP.
 2080                                                  */
 2081                                                 TAILQ_INSERT_TAIL(&asoc->pending_reply_queue, control, next);
 2082                                         }
 2083                                 }
 2084                         } else {
 2085                                 sctp_queue_data_to_stream(stcb, asoc, control, abort_flag);
 2086                                 if (*abort_flag) {
 2087                                         return (0);
 2088                                 }
 2089                         }
 2090                 }
 2091         } else {
 2092                 /* Into the re-assembly queue */
 2093                 sctp_queue_data_for_reasm(stcb, asoc, chk, abort_flag);
 2094                 if (*abort_flag) {
 2095                         /*
 2096                          * the assoc is now gone and chk was put onto the
 2097                          * reasm queue, which has all been freed.
 2098                          */
 2099                         *m = NULL;
 2100                         return (0);
 2101                 }
 2102         }
 2103 finish_express_del:
 2104         if (compare_with_wrap(tsn, asoc->highest_tsn_inside_map, MAX_TSN)) {
 2105                 /* we have a new high score */
 2106                 asoc->highest_tsn_inside_map = tsn;
 2107                 if (sctp_logging_level & SCTP_MAP_LOGGING_ENABLE) {
 2108                         sctp_log_map(0, 2, asoc->highest_tsn_inside_map, SCTP_MAP_SLIDE_RESULT);
 2109                 }
 2110         }
 2111         if (tsn == (asoc->cumulative_tsn + 1)) {
 2112                 /* Update cum-ack */
 2113                 asoc->cumulative_tsn = tsn;
 2114         }
 2115         if (last_chunk) {
 2116                 *m = NULL;
 2117         }
 2118         if (ordered) {
 2119                 SCTP_STAT_INCR_COUNTER64(sctps_inorderchunks);
 2120         } else {
 2121                 SCTP_STAT_INCR_COUNTER64(sctps_inunorderchunks);
 2122         }
 2123         SCTP_STAT_INCR(sctps_recvdata);
 2124         /* Set it present please */
 2125         if (sctp_logging_level & SCTP_STR_LOGGING_ENABLE) {
 2126                 sctp_log_strm_del_alt(stcb, tsn, strmseq, strmno, SCTP_STR_LOG_FROM_MARK_TSN);
 2127         }
 2128         if (sctp_logging_level & SCTP_MAP_LOGGING_ENABLE) {
 2129                 sctp_log_map(asoc->mapping_array_base_tsn, asoc->cumulative_tsn,
 2130                     asoc->highest_tsn_inside_map, SCTP_MAP_PREPARE_SLIDE);
 2131         }
 2132         SCTP_TCB_LOCK_ASSERT(stcb);
 2133         SCTP_SET_TSN_PRESENT(asoc->mapping_array, gap);
 2134         /* check the special flag for stream resets */
 2135         if (((liste = TAILQ_FIRST(&asoc->resetHead)) != NULL) &&
 2136             ((compare_with_wrap(asoc->cumulative_tsn, liste->tsn, MAX_TSN)) ||
 2137             (asoc->cumulative_tsn == liste->tsn))
 2138             ) {
 2139                 /*
 2140                  * we have finished working through the backlogged TSN's now
 2141                  * time to reset streams. 1: call reset function. 2: free
 2142                  * pending_reply space 3: distribute any chunks in
 2143                  * pending_reply_queue.
 2144                  */
 2145                 struct sctp_queued_to_read *ctl;
 2146 
 2147                 sctp_reset_in_stream(stcb, liste->number_entries, liste->req.list_of_streams);
 2148                 TAILQ_REMOVE(&asoc->resetHead, liste, next_resp);
 2149                 SCTP_FREE(liste, SCTP_M_STRESET);
 2150                 /* sa_ignore FREED_MEMORY */
 2151                 liste = TAILQ_FIRST(&asoc->resetHead);
 2152                 ctl = TAILQ_FIRST(&asoc->pending_reply_queue);
 2153                 if (ctl && (liste == NULL)) {
 2154                         /* All can be removed */
 2155                         while (ctl) {
 2156                                 TAILQ_REMOVE(&asoc->pending_reply_queue, ctl, next);
 2157                                 sctp_queue_data_to_stream(stcb, asoc, ctl, abort_flag);
 2158                                 if (*abort_flag) {
 2159                                         return (0);
 2160                                 }
 2161                                 ctl = TAILQ_FIRST(&asoc->pending_reply_queue);
 2162                         }
 2163                 } else if (ctl) {
 2164                         /* more than one in queue */
 2165                         while (!compare_with_wrap(ctl->sinfo_tsn, liste->tsn, MAX_TSN)) {
 2166                                 /*
 2167                                  * if ctl->sinfo_tsn is <= liste->tsn we can
 2168                                  * process it which is the NOT of
 2169                                  * ctl->sinfo_tsn > liste->tsn
 2170                                  */
 2171                                 TAILQ_REMOVE(&asoc->pending_reply_queue, ctl, next);
 2172                                 sctp_queue_data_to_stream(stcb, asoc, ctl, abort_flag);
 2173                                 if (*abort_flag) {
 2174                                         return (0);
 2175                                 }
 2176                                 ctl = TAILQ_FIRST(&asoc->pending_reply_queue);
 2177                         }
 2178                 }
 2179                 /*
 2180                  * Now service re-assembly to pick up anything that has been
 2181                  * held on reassembly queue?
 2182                  */
 2183                 sctp_deliver_reasm_check(stcb, asoc);
 2184                 need_reasm_check = 0;
 2185         }
 2186         if (need_reasm_check) {
 2187                 /* Another one waits ? */
 2188                 sctp_deliver_reasm_check(stcb, asoc);
 2189         }
 2190         return (1);
 2191 }
 2192 
 2193 int8_t sctp_map_lookup_tab[256] = {
 2194         -1, 0, -1, 1, -1, 0, -1, 2,
 2195         -1, 0, -1, 1, -1, 0, -1, 3,
 2196         -1, 0, -1, 1, -1, 0, -1, 2,
 2197         -1, 0, -1, 1, -1, 0, -1, 4,
 2198         -1, 0, -1, 1, -1, 0, -1, 2,
 2199         -1, 0, -1, 1, -1, 0, -1, 3,
 2200         -1, 0, -1, 1, -1, 0, -1, 2,
 2201         -1, 0, -1, 1, -1, 0, -1, 5,
 2202         -1, 0, -1, 1, -1, 0, -1, 2,
 2203         -1, 0, -1, 1, -1, 0, -1, 3,
 2204         -1, 0, -1, 1, -1, 0, -1, 2,
 2205         -1, 0, -1, 1, -1, 0, -1, 4,
 2206         -1, 0, -1, 1, -1, 0, -1, 2,
 2207         -1, 0, -1, 1, -1, 0, -1, 3,
 2208         -1, 0, -1, 1, -1, 0, -1, 2,
 2209         -1, 0, -1, 1, -1, 0, -1, 6,
 2210         -1, 0, -1, 1, -1, 0, -1, 2,
 2211         -1, 0, -1, 1, -1, 0, -1, 3,
 2212         -1, 0, -1, 1, -1, 0, -1, 2,
 2213         -1, 0, -1, 1, -1, 0, -1, 4,
 2214         -1, 0, -1, 1, -1, 0, -1, 2,
 2215         -1, 0, -1, 1, -1, 0, -1, 3,
 2216         -1, 0, -1, 1, -1, 0, -1, 2,
 2217         -1, 0, -1, 1, -1, 0, -1, 5,
 2218         -1, 0, -1, 1, -1, 0, -1, 2,
 2219         -1, 0, -1, 1, -1, 0, -1, 3,
 2220         -1, 0, -1, 1, -1, 0, -1, 2,
 2221         -1, 0, -1, 1, -1, 0, -1, 4,
 2222         -1, 0, -1, 1, -1, 0, -1, 2,
 2223         -1, 0, -1, 1, -1, 0, -1, 3,
 2224         -1, 0, -1, 1, -1, 0, -1, 2,
 2225         -1, 0, -1, 1, -1, 0, -1, 7,
 2226 };
 2227 
 2228 
 2229 void
 2230 sctp_sack_check(struct sctp_tcb *stcb, int ok_to_sack, int was_a_gap, int *abort_flag)
 2231 {
 2232         /*
 2233          * Now we also need to check the mapping array in a couple of ways.
 2234          * 1) Did we move the cum-ack point?
 2235          */
 2236         struct sctp_association *asoc;
 2237         int i, at;
 2238         int last_all_ones = 0;
 2239         int slide_from, slide_end, lgap, distance;
 2240         uint32_t old_cumack, old_base, old_highest;
 2241         unsigned char aux_array[64];
 2242 
 2243 
 2244         asoc = &stcb->asoc;
 2245         at = 0;
 2246 
 2247         old_cumack = asoc->cumulative_tsn;
 2248         old_base = asoc->mapping_array_base_tsn;
 2249         old_highest = asoc->highest_tsn_inside_map;
 2250         if (asoc->mapping_array_size < 64)
 2251                 memcpy(aux_array, asoc->mapping_array,
 2252                     asoc->mapping_array_size);
 2253         else
 2254                 memcpy(aux_array, asoc->mapping_array, 64);
 2255 
 2256         /*
 2257          * We could probably improve this a small bit by calculating the
 2258          * offset of the current cum-ack as the starting point.
 2259          */
 2260         at = 0;
 2261         for (i = 0; i < stcb->asoc.mapping_array_size; i++) {
 2262 
 2263                 if (asoc->mapping_array[i] == 0xff) {
 2264                         at += 8;
 2265                         last_all_ones = 1;
 2266                 } else {
 2267                         /* there is a 0 bit */
 2268                         at += sctp_map_lookup_tab[asoc->mapping_array[i]];
 2269                         last_all_ones = 0;
 2270                         break;
 2271                 }
 2272         }
 2273         asoc->cumulative_tsn = asoc->mapping_array_base_tsn + (at - last_all_ones);
 2274         /* at is one off, since in the table a embedded -1 is present */
 2275         at++;
 2276 
 2277         if (compare_with_wrap(asoc->cumulative_tsn,
 2278             asoc->highest_tsn_inside_map,
 2279             MAX_TSN)) {
 2280 #ifdef INVARIANTS
 2281                 panic("huh, cumack 0x%x greater than high-tsn 0x%x in map",
 2282                     asoc->cumulative_tsn, asoc->highest_tsn_inside_map);
 2283 #else
 2284                 SCTP_PRINTF("huh, cumack 0x%x greater than high-tsn 0x%x in map - should panic?\n",
 2285                     asoc->cumulative_tsn, asoc->highest_tsn_inside_map);
 2286                 asoc->highest_tsn_inside_map = asoc->cumulative_tsn;
 2287 #endif
 2288         }
 2289         if ((asoc->cumulative_tsn == asoc->highest_tsn_inside_map) && (at >= 8)) {
 2290                 /* The complete array was completed by a single FR */
 2291                 /* higest becomes the cum-ack */
 2292                 int clr;
 2293 
 2294                 asoc->cumulative_tsn = asoc->highest_tsn_inside_map;
 2295                 /* clear the array */
 2296                 clr = (at >> 3) + 1;
 2297                 if (clr > asoc->mapping_array_size) {
 2298                         clr = asoc->mapping_array_size;
 2299                 }
 2300                 memset(asoc->mapping_array, 0, clr);
 2301                 /* base becomes one ahead of the cum-ack */
 2302                 asoc->mapping_array_base_tsn = asoc->cumulative_tsn + 1;
 2303                 if (sctp_logging_level & SCTP_MAP_LOGGING_ENABLE) {
 2304                         sctp_log_map(old_base, old_cumack, old_highest,
 2305                             SCTP_MAP_PREPARE_SLIDE);
 2306                         sctp_log_map(asoc->mapping_array_base_tsn, asoc->cumulative_tsn,
 2307                             asoc->highest_tsn_inside_map, SCTP_MAP_SLIDE_CLEARED);
 2308                 }
 2309         } else if (at >= 8) {
 2310                 /* we can slide the mapping array down */
 2311                 /* Calculate the new byte postion we can move down */
 2312                 slide_from = at >> 3;
 2313                 /*
 2314                  * now calculate the ceiling of the move using our highest
 2315                  * TSN value
 2316                  */
 2317                 if (asoc->highest_tsn_inside_map >= asoc->mapping_array_base_tsn) {
 2318                         lgap = asoc->highest_tsn_inside_map -
 2319                             asoc->mapping_array_base_tsn;
 2320                 } else {
 2321                         lgap = (MAX_TSN - asoc->mapping_array_base_tsn) +
 2322                             asoc->highest_tsn_inside_map + 1;
 2323                 }
 2324                 slide_end = lgap >> 3;
 2325                 if (slide_end < slide_from) {
 2326 #ifdef INVARIANTS
 2327                         panic("impossible slide");
 2328 #else
 2329                         printf("impossible slide?\n");
 2330                         return;
 2331 #endif
 2332                 }
 2333                 distance = (slide_end - slide_from) + 1;
 2334                 if (sctp_logging_level & SCTP_MAP_LOGGING_ENABLE) {
 2335                         sctp_log_map(old_base, old_cumack, old_highest,
 2336                             SCTP_MAP_PREPARE_SLIDE);
 2337                         sctp_log_map((uint32_t) slide_from, (uint32_t) slide_end,
 2338                             (uint32_t) lgap, SCTP_MAP_SLIDE_FROM);
 2339                 }
 2340                 if (distance + slide_from > asoc->mapping_array_size ||
 2341                     distance < 0) {
 2342                         /*
 2343                          * Here we do NOT slide forward the array so that
 2344                          * hopefully when more data comes in to fill it up
 2345                          * we will be able to slide it forward. Really I
 2346                          * don't think this should happen :-0
 2347                          */
 2348 
 2349                         if (sctp_logging_level & SCTP_MAP_LOGGING_ENABLE) {
 2350                                 sctp_log_map((uint32_t) distance, (uint32_t) slide_from,
 2351                                     (uint32_t) asoc->mapping_array_size,
 2352                                     SCTP_MAP_SLIDE_NONE);
 2353                         }
 2354                 } else {
 2355                         int ii;
 2356 
 2357                         for (ii = 0; ii < distance; ii++) {
 2358                                 asoc->mapping_array[ii] =
 2359                                     asoc->mapping_array[slide_from + ii];
 2360                         }
 2361                         for (ii = distance; ii <= slide_end; ii++) {
 2362                                 asoc->mapping_array[ii] = 0;
 2363                         }
 2364                         asoc->mapping_array_base_tsn += (slide_from << 3);
 2365                         if (sctp_logging_level & SCTP_MAP_LOGGING_ENABLE) {
 2366                                 sctp_log_map(asoc->mapping_array_base_tsn,
 2367                                     asoc->cumulative_tsn, asoc->highest_tsn_inside_map,
 2368                                     SCTP_MAP_SLIDE_RESULT);
 2369                         }
 2370                 }
 2371         }
 2372         /*
 2373          * Now we need to see if we need to queue a sack or just start the
 2374          * timer (if allowed).
 2375          */
 2376         if (ok_to_sack) {
 2377                 if (SCTP_GET_STATE(asoc) == SCTP_STATE_SHUTDOWN_SENT) {
 2378                         /*
 2379                          * Ok special case, in SHUTDOWN-SENT case. here we
 2380                          * maker sure SACK timer is off and instead send a
 2381                          * SHUTDOWN and a SACK
 2382                          */
 2383                         if (SCTP_OS_TIMER_PENDING(&stcb->asoc.dack_timer.timer)) {
 2384                                 sctp_timer_stop(SCTP_TIMER_TYPE_RECV,
 2385                                     stcb->sctp_ep, stcb, NULL, SCTP_FROM_SCTP_INDATA + SCTP_LOC_18);
 2386                         }
 2387                         sctp_send_shutdown(stcb, stcb->asoc.primary_destination);
 2388                         sctp_send_sack(stcb);
 2389                 } else {
 2390                         int is_a_gap;
 2391 
 2392                         /* is there a gap now ? */
 2393                         is_a_gap = compare_with_wrap(stcb->asoc.highest_tsn_inside_map,
 2394                             stcb->asoc.cumulative_tsn, MAX_TSN);
 2395 
 2396                         /*
 2397                          * CMT DAC algorithm: increase number of packets
 2398                          * received since last ack
 2399                          */
 2400                         stcb->asoc.cmt_dac_pkts_rcvd++;
 2401 
 2402                         if ((stcb->asoc.send_sack == 1) ||      /* We need to send a
 2403                                                                  * SACK */
 2404                             ((was_a_gap) && (is_a_gap == 0)) || /* was a gap, but no
 2405                                                                  * longer is one */
 2406                             (stcb->asoc.numduptsns) ||  /* we have dup's */
 2407                             (is_a_gap) ||       /* is still a gap */
 2408                             (stcb->asoc.delayed_ack == 0) ||    /* Delayed sack disabled */
 2409                             (stcb->asoc.data_pkts_seen >= stcb->asoc.sack_freq) /* hit limit of pkts */
 2410                             ) {
 2411 
 2412                                 if ((sctp_cmt_on_off) && (sctp_cmt_use_dac) &&
 2413                                     (stcb->asoc.send_sack == 0) &&
 2414                                     (stcb->asoc.numduptsns == 0) &&
 2415                                     (stcb->asoc.delayed_ack) &&
 2416                                     (!SCTP_OS_TIMER_PENDING(&stcb->asoc.dack_timer.timer))) {
 2417 
 2418                                         /*
 2419                                          * CMT DAC algorithm: With CMT,
 2420                                          * delay acks even in the face of
 2421                                          * 
 2422                                          * reordering. Therefore, if acks that
 2423                                          * do not have to be sent because of
 2424                                          * the above reasons, will be
 2425                                          * delayed. That is, acks that would
 2426                                          * have been sent due to gap reports
 2427                                          * will be delayed with DAC. Start
 2428                                          * the delayed ack timer.
 2429                                          */
 2430                                         sctp_timer_start(SCTP_TIMER_TYPE_RECV,
 2431                                             stcb->sctp_ep, stcb, NULL);
 2432                                 } else {
 2433                                         /*
 2434                                          * Ok we must build a SACK since the
 2435                                          * timer is pending, we got our
 2436                                          * first packet OR there are gaps or
 2437                                          * duplicates.
 2438                                          */
 2439                                         (void)SCTP_OS_TIMER_STOP(&stcb->asoc.dack_timer.timer);
 2440                                         sctp_send_sack(stcb);
 2441                                 }
 2442                         } else {
 2443                                 if (!SCTP_OS_TIMER_PENDING(&stcb->asoc.dack_timer.timer)) {
 2444                                         sctp_timer_start(SCTP_TIMER_TYPE_RECV,
 2445                                             stcb->sctp_ep, stcb, NULL);
 2446                                 }
 2447                         }
 2448                 }
 2449         }
 2450 }
 2451 
 2452 void
 2453 sctp_service_queues(struct sctp_tcb *stcb, struct sctp_association *asoc)
 2454 {
 2455         struct sctp_tmit_chunk *chk;
 2456         uint32_t tsize;
 2457         uint16_t nxt_todel;
 2458 
 2459         if (asoc->fragmented_delivery_inprogress) {
 2460                 sctp_service_reassembly(stcb, asoc);
 2461         }
 2462         /* Can we proceed further, i.e. the PD-API is complete */
 2463         if (asoc->fragmented_delivery_inprogress) {
 2464                 /* no */
 2465                 return;
 2466         }
 2467         /*
 2468          * Now is there some other chunk I can deliver from the reassembly
 2469          * queue.
 2470          */
 2471 doit_again:
 2472         chk = TAILQ_FIRST(&asoc->reasmqueue);
 2473         if (chk == NULL) {
 2474                 asoc->size_on_reasm_queue = 0;
 2475                 asoc->cnt_on_reasm_queue = 0;
 2476                 return;
 2477         }
 2478         nxt_todel = asoc->strmin[chk->rec.data.stream_number].last_sequence_delivered + 1;
 2479         if ((chk->rec.data.rcv_flags & SCTP_DATA_FIRST_FRAG) &&
 2480             ((nxt_todel == chk->rec.data.stream_seq) ||
 2481             (chk->rec.data.rcv_flags & SCTP_DATA_UNORDERED))) {
 2482                 /*
 2483                  * Yep the first one is here. We setup to start reception,
 2484                  * by backing down the TSN just in case we can't deliver.
 2485                  */
 2486 
 2487                 /*
 2488                  * Before we start though either all of the message should
 2489                  * be here or 1/4 the socket buffer max or nothing on the
 2490                  * delivery queue and something can be delivered.
 2491                  */
 2492                 if ((sctp_is_all_msg_on_reasm(asoc, &tsize) ||
 2493                     (tsize >= stcb->sctp_ep->partial_delivery_point))) {
 2494                         asoc->fragmented_delivery_inprogress = 1;
 2495                         asoc->tsn_last_delivered = chk->rec.data.TSN_seq - 1;
 2496                         asoc->str_of_pdapi = chk->rec.data.stream_number;
 2497                         asoc->ssn_of_pdapi = chk->rec.data.stream_seq;
 2498                         asoc->pdapi_ppid = chk->rec.data.payloadtype;
 2499                         asoc->fragment_flags = chk->rec.data.rcv_flags;
 2500                         sctp_service_reassembly(stcb, asoc);
 2501                         if (asoc->fragmented_delivery_inprogress == 0) {
 2502                                 goto doit_again;
 2503                         }
 2504                 }
 2505         }
 2506 }
 2507 
 2508 int
 2509 sctp_process_data(struct mbuf **mm, int iphlen, int *offset, int length,
 2510     struct sctphdr *sh, struct sctp_inpcb *inp, struct sctp_tcb *stcb,
 2511     struct sctp_nets *net, uint32_t * high_tsn)
 2512 {
 2513         struct sctp_data_chunk *ch, chunk_buf;
 2514         struct sctp_association *asoc;
 2515         int num_chunks = 0;     /* number of control chunks processed */
 2516         int stop_proc = 0;
 2517         int chk_length, break_flag, last_chunk;
 2518         int abort_flag = 0, was_a_gap = 0;
 2519         struct mbuf *m;
 2520 
 2521         /* set the rwnd */
 2522         sctp_set_rwnd(stcb, &stcb->asoc);
 2523 
 2524         m = *mm;
 2525         SCTP_TCB_LOCK_ASSERT(stcb);
 2526         asoc = &stcb->asoc;
 2527         if (compare_with_wrap(stcb->asoc.highest_tsn_inside_map,
 2528             stcb->asoc.cumulative_tsn, MAX_TSN)) {
 2529                 /* there was a gap before this data was processed */
 2530                 was_a_gap = 1;
 2531         }
 2532         /*
 2533          * setup where we got the last DATA packet from for any SACK that
 2534          * may need to go out. Don't bump the net. This is done ONLY when a
 2535          * chunk is assigned.
 2536          */
 2537         asoc->last_data_chunk_from = net;
 2538 
 2539         /*-
 2540          * Now before we proceed we must figure out if this is a wasted
 2541          * cluster... i.e. it is a small packet sent in and yet the driver
 2542          * underneath allocated a full cluster for it. If so we must copy it
 2543          * to a smaller mbuf and free up the cluster mbuf. This will help
 2544          * with cluster starvation. Note for __Panda__ we don't do this
 2545          * since it has clusters all the way down to 64 bytes.
 2546          */
 2547         if (SCTP_BUF_LEN(m) < (long)MLEN && SCTP_BUF_NEXT(m) == NULL) {
 2548                 /* we only handle mbufs that are singletons.. not chains */
 2549                 m = sctp_get_mbuf_for_msg(SCTP_BUF_LEN(m), 0, M_DONTWAIT, 1, MT_DATA);
 2550                 if (m) {
 2551                         /* ok lets see if we can copy the data up */
 2552                         caddr_t *from, *to;
 2553 
 2554                         /* get the pointers and copy */
 2555                         to = mtod(m, caddr_t *);
 2556                         from = mtod((*mm), caddr_t *);
 2557                         memcpy(to, from, SCTP_BUF_LEN((*mm)));
 2558                         /* copy the length and free up the old */
 2559                         SCTP_BUF_LEN(m) = SCTP_BUF_LEN((*mm));
 2560                         sctp_m_freem(*mm);
 2561                         /* sucess, back copy */
 2562                         *mm = m;
 2563                 } else {
 2564                         /* We are in trouble in the mbuf world .. yikes */
 2565                         m = *mm;
 2566                 }
 2567         }
 2568         /* get pointer to the first chunk header */
 2569         ch = (struct sctp_data_chunk *)sctp_m_getptr(m, *offset,
 2570             sizeof(struct sctp_data_chunk), (uint8_t *) & chunk_buf);
 2571         if (ch == NULL) {
 2572                 return (1);
 2573         }
 2574         /*
 2575          * process all DATA chunks...
 2576          */
 2577         *high_tsn = asoc->cumulative_tsn;
 2578         break_flag = 0;
 2579         asoc->data_pkts_seen++;
 2580         while (stop_proc == 0) {
 2581                 /* validate chunk length */
 2582                 chk_length = ntohs(ch->ch.chunk_length);
 2583                 if (length - *offset < chk_length) {
 2584                         /* all done, mutulated chunk */
 2585                         stop_proc = 1;
 2586                         break;
 2587                 }
 2588                 if (ch->ch.chunk_type == SCTP_DATA) {
 2589                         if ((size_t)chk_length < sizeof(struct sctp_data_chunk) + 1) {
 2590                                 /*
 2591                                  * Need to send an abort since we had a
 2592                                  * invalid data chunk.
 2593                                  */
 2594                                 struct mbuf *op_err;
 2595 
 2596                                 op_err = sctp_get_mbuf_for_msg((sizeof(struct sctp_paramhdr) + 2 * sizeof(uint32_t)),
 2597                                     0, M_DONTWAIT, 1, MT_DATA);
 2598 
 2599                                 if (op_err) {
 2600                                         struct sctp_paramhdr *ph;
 2601                                         uint32_t *ippp;
 2602 
 2603                                         SCTP_BUF_LEN(op_err) = sizeof(struct sctp_paramhdr) +
 2604                                             (2 * sizeof(uint32_t));
 2605                                         ph = mtod(op_err, struct sctp_paramhdr *);
 2606                                         ph->param_type =
 2607                                             htons(SCTP_CAUSE_PROTOCOL_VIOLATION);
 2608                                         ph->param_length = htons(SCTP_BUF_LEN(op_err));
 2609                                         ippp = (uint32_t *) (ph + 1);
 2610                                         *ippp = htonl(SCTP_FROM_SCTP_INDATA + SCTP_LOC_19);
 2611                                         ippp++;
 2612                                         *ippp = asoc->cumulative_tsn;
 2613 
 2614                                 }
 2615                                 stcb->sctp_ep->last_abort_code = SCTP_FROM_SCTP_INDATA + SCTP_LOC_19;
 2616                                 sctp_abort_association(inp, stcb, m, iphlen, sh,
 2617                                     op_err, 0);
 2618                                 return (2);
 2619                         }
 2620 #ifdef SCTP_AUDITING_ENABLED
 2621                         sctp_audit_log(0xB1, 0);
 2622 #endif
 2623                         if (SCTP_SIZE32(chk_length) == (length - *offset)) {
 2624                                 last_chunk = 1;
 2625                         } else {
 2626                                 last_chunk = 0;
 2627                         }
 2628                         if (sctp_process_a_data_chunk(stcb, asoc, mm, *offset, ch,
 2629                             chk_length, net, high_tsn, &abort_flag, &break_flag,
 2630                             last_chunk)) {
 2631                                 num_chunks++;
 2632                         }
 2633                         if (abort_flag)
 2634                                 return (2);
 2635 
 2636                         if (break_flag) {
 2637                                 /*
 2638                                  * Set because of out of rwnd space and no
 2639                                  * drop rep space left.
 2640                                  */
 2641                                 stop_proc = 1;
 2642                                 break;
 2643                         }
 2644                 } else {
 2645                         /* not a data chunk in the data region */
 2646                         switch (ch->ch.chunk_type) {
 2647                         case SCTP_INITIATION:
 2648                         case SCTP_INITIATION_ACK:
 2649                         case SCTP_SELECTIVE_ACK:
 2650                         case SCTP_HEARTBEAT_REQUEST:
 2651                         case SCTP_HEARTBEAT_ACK:
 2652                         case SCTP_ABORT_ASSOCIATION:
 2653                         case SCTP_SHUTDOWN:
 2654                         case SCTP_SHUTDOWN_ACK:
 2655                         case SCTP_OPERATION_ERROR:
 2656                         case SCTP_COOKIE_ECHO:
 2657                         case SCTP_COOKIE_ACK:
 2658                         case SCTP_ECN_ECHO:
 2659                         case SCTP_ECN_CWR:
 2660                         case SCTP_SHUTDOWN_COMPLETE:
 2661                         case SCTP_AUTHENTICATION:
 2662                         case SCTP_ASCONF_ACK:
 2663                         case SCTP_PACKET_DROPPED:
 2664                         case SCTP_STREAM_RESET:
 2665                         case SCTP_FORWARD_CUM_TSN:
 2666                         case SCTP_ASCONF:
 2667                                 /*
 2668                                  * Now, what do we do with KNOWN chunks that
 2669                                  * are NOT in the right place?
 2670                                  * 
 2671                                  * For now, I do nothing but ignore them. We
 2672                                  * may later want to add sysctl stuff to
 2673                                  * switch out and do either an ABORT() or
 2674                                  * possibly process them.
 2675                                  */
 2676                                 if (sctp_strict_data_order) {
 2677                                         struct mbuf *op_err;
 2678 
 2679                                         op_err = sctp_generate_invmanparam(SCTP_CAUSE_PROTOCOL_VIOLATION);
 2680                                         sctp_abort_association(inp, stcb, m, iphlen, sh, op_err, 0);
 2681                                         return (2);
 2682                                 }
 2683                                 break;
 2684                         default:
 2685                                 /* unknown chunk type, use bit rules */
 2686                                 if (ch->ch.chunk_type & 0x40) {
 2687                                         /* Add a error report to the queue */
 2688                                         struct mbuf *merr;
 2689                                         struct sctp_paramhdr *phd;
 2690 
 2691                                         merr = sctp_get_mbuf_for_msg(sizeof(*phd), 0, M_DONTWAIT, 1, MT_DATA);
 2692                                         if (merr) {
 2693                                                 phd = mtod(merr, struct sctp_paramhdr *);
 2694                                                 /*
 2695                                                  * We cheat and use param
 2696                                                  * type since we did not
 2697                                                  * bother to define a error
 2698                                                  * cause struct. They are
 2699                                                  * the same basic format
 2700                                                  * with different names.
 2701                                                  */
 2702                                                 phd->param_type =
 2703                                                     htons(SCTP_CAUSE_UNRECOG_CHUNK);
 2704                                                 phd->param_length =
 2705                                                     htons(chk_length + sizeof(*phd));
 2706                                                 SCTP_BUF_LEN(merr) = sizeof(*phd);
 2707                                                 SCTP_BUF_NEXT(merr) = SCTP_M_COPYM(m, *offset,
 2708                                                     SCTP_SIZE32(chk_length),
 2709                                                     M_DONTWAIT);
 2710                                                 if (SCTP_BUF_NEXT(merr)) {
 2711                                                         sctp_queue_op_err(stcb, merr);
 2712                                                 } else {
 2713                                                         sctp_m_freem(merr);
 2714                                                 }
 2715                                         }
 2716                                 }
 2717                                 if ((ch->ch.chunk_type & 0x80) == 0) {
 2718                                         /* discard the rest of this packet */
 2719                                         stop_proc = 1;
 2720                                 }       /* else skip this bad chunk and
 2721                                          * continue... */
 2722                                 break;
 2723                         };      /* switch of chunk type */
 2724                 }
 2725                 *offset += SCTP_SIZE32(chk_length);
 2726                 if ((*offset >= length) || stop_proc) {
 2727                         /* no more data left in the mbuf chain */
 2728                         stop_proc = 1;
 2729                         continue;
 2730                 }
 2731                 ch = (struct sctp_data_chunk *)sctp_m_getptr(m, *offset,
 2732                     sizeof(struct sctp_data_chunk), (uint8_t *) & chunk_buf);
 2733                 if (ch == NULL) {
 2734                         *offset = length;
 2735                         stop_proc = 1;
 2736                         break;
 2737 
 2738                 }
 2739         }                       /* while */
 2740         if (break_flag) {
 2741                 /*
 2742                  * we need to report rwnd overrun drops.
 2743                  */
 2744                 sctp_send_packet_dropped(stcb, net, *mm, iphlen, 0);
 2745         }
 2746         if (num_chunks) {
 2747                 /*
 2748                  * Did we get data, if so update the time for auto-close and
 2749                  * give peer credit for being alive.
 2750                  */
 2751                 SCTP_STAT_INCR(sctps_recvpktwithdata);
 2752                 if (sctp_logging_level & SCTP_THRESHOLD_LOGGING) {
 2753                         sctp_misc_ints(SCTP_THRESHOLD_CLEAR,
 2754                             stcb->asoc.overall_error_count,
 2755                             0,
 2756                             SCTP_FROM_SCTP_INDATA,
 2757                             __LINE__);
 2758                 }
 2759                 stcb->asoc.overall_error_count = 0;
 2760                 (void)SCTP_GETTIME_TIMEVAL(&stcb->asoc.time_last_rcvd);
 2761         }
 2762         /* now service all of the reassm queue if needed */
 2763         if (!(TAILQ_EMPTY(&asoc->reasmqueue)))
 2764                 sctp_service_queues(stcb, asoc);
 2765 
 2766         if (SCTP_GET_STATE(asoc) == SCTP_STATE_SHUTDOWN_SENT) {
 2767                 /* Assure that we ack right away */
 2768                 stcb->asoc.send_sack = 1;
 2769         }
 2770         /* Start a sack timer or QUEUE a SACK for sending */
 2771         if ((stcb->asoc.cumulative_tsn == stcb->asoc.highest_tsn_inside_map) &&
 2772             (stcb->asoc.mapping_array[0] != 0xff)) {
 2773                 if ((stcb->asoc.data_pkts_seen >= stcb->asoc.sack_freq) ||
 2774                     (stcb->asoc.delayed_ack == 0) ||
 2775                     (stcb->asoc.numduptsns) ||
 2776                     (stcb->asoc.send_sack == 1)) {
 2777                         if (SCTP_OS_TIMER_PENDING(&stcb->asoc.dack_timer.timer)) {
 2778                                 (void)SCTP_OS_TIMER_STOP(&stcb->asoc.dack_timer.timer);
 2779                         }
 2780                         sctp_send_sack(stcb);
 2781                 } else {
 2782                         if (!SCTP_OS_TIMER_PENDING(&stcb->asoc.dack_timer.timer)) {
 2783                                 sctp_timer_start(SCTP_TIMER_TYPE_RECV,
 2784                                     stcb->sctp_ep, stcb, NULL);
 2785                         }
 2786                 }
 2787         } else {
 2788                 sctp_sack_check(stcb, 1, was_a_gap, &abort_flag);
 2789         }
 2790         if (abort_flag)
 2791                 return (2);
 2792 
 2793         return (0);
 2794 }
 2795 
 2796 static void
 2797 sctp_handle_segments(struct mbuf *m, int *offset, struct sctp_tcb *stcb, struct sctp_association *asoc,
 2798     struct sctp_sack_chunk *ch, uint32_t last_tsn, uint32_t * biggest_tsn_acked,
 2799     uint32_t * biggest_newly_acked_tsn, uint32_t * this_sack_lowest_newack,
 2800     int num_seg, int *ecn_seg_sums)
 2801 {
 2802         /************************************************/
 2803         /* process fragments and update sendqueue        */
 2804         /************************************************/
 2805         struct sctp_sack *sack;
 2806         struct sctp_gap_ack_block *frag, block;
 2807         struct sctp_tmit_chunk *tp1;
 2808         int i;
 2809         unsigned int j;
 2810         int num_frs = 0;
 2811 
 2812         uint16_t frag_strt, frag_end, primary_flag_set;
 2813         u_long last_frag_high;
 2814 
 2815         /*
 2816          * @@@ JRI : TODO: This flag is not used anywhere .. remove?
 2817          */
 2818         if (asoc->primary_destination->dest_state & SCTP_ADDR_SWITCH_PRIMARY) {
 2819                 primary_flag_set = 1;
 2820         } else {
 2821                 primary_flag_set = 0;
 2822         }
 2823         sack = &ch->sack;
 2824 
 2825         frag = (struct sctp_gap_ack_block *)sctp_m_getptr(m, *offset,
 2826             sizeof(struct sctp_gap_ack_block), (uint8_t *) & block);
 2827         *offset += sizeof(block);
 2828         if (frag == NULL) {
 2829                 return;
 2830         }
 2831         tp1 = NULL;
 2832         last_frag_high = 0;
 2833         for (i = 0; i < num_seg; i++) {
 2834                 frag_strt = ntohs(frag->start);
 2835                 frag_end = ntohs(frag->end);
 2836                 /* some sanity checks on the fargment offsets */
 2837                 if (frag_strt > frag_end) {
 2838                         /* this one is malformed, skip */
 2839                         frag++;
 2840                         continue;
 2841                 }
 2842                 if (compare_with_wrap((frag_end + last_tsn), *biggest_tsn_acked,
 2843                     MAX_TSN))
 2844                         *biggest_tsn_acked = frag_end + last_tsn;
 2845 
 2846                 /* mark acked dgs and find out the highestTSN being acked */
 2847                 if (tp1 == NULL) {
 2848                         tp1 = TAILQ_FIRST(&asoc->sent_queue);
 2849 
 2850                         /* save the locations of the last frags */
 2851                         last_frag_high = frag_end + last_tsn;
 2852                 } else {
 2853                         /*
 2854                          * now lets see if we need to reset the queue due to
 2855                          * a out-of-order SACK fragment
 2856                          */
 2857                         if (compare_with_wrap(frag_strt + last_tsn,
 2858                             last_frag_high, MAX_TSN)) {
 2859                                 /*
 2860                                  * if the new frag starts after the last TSN
 2861                                  * frag covered, we are ok and this one is
 2862                                  * beyond the last one
 2863                                  */
 2864                                 ;
 2865                         } else {
 2866                                 /*
 2867                                  * ok, they have reset us, so we need to
 2868                                  * reset the queue this will cause extra
 2869                                  * hunting but hey, they chose the
 2870                                  * performance hit when they failed to order
 2871                                  * there gaps..
 2872                                  */
 2873                                 tp1 = TAILQ_FIRST(&asoc->sent_queue);
 2874                         }
 2875                         last_frag_high = frag_end + last_tsn;
 2876                 }
 2877                 for (j = frag_strt + last_tsn; (compare_with_wrap((frag_end + last_tsn), j, MAX_TSN)); j++) {
 2878                         while (tp1) {
 2879                                 if (tp1->rec.data.doing_fast_retransmit)
 2880                                         num_frs++;
 2881 
 2882                                 /*
 2883                                  * CMT: CUCv2 algorithm. For each TSN being
 2884                                  * processed from the sent queue, track the
 2885                                  * next expected pseudo-cumack, or
 2886                                  * rtx_pseudo_cumack, if required. Separate
 2887                                  * cumack trackers for first transmissions,
 2888                                  * and retransmissions.
 2889                                  */
 2890                                 if ((tp1->whoTo->find_pseudo_cumack == 1) && (tp1->sent < SCTP_DATAGRAM_RESEND) &&
 2891                                     (tp1->snd_count == 1)) {
 2892                                         tp1->whoTo->pseudo_cumack = tp1->rec.data.TSN_seq;
 2893                                         tp1->whoTo->find_pseudo_cumack = 0;
 2894                                 }
 2895                                 if ((tp1->whoTo->find_rtx_pseudo_cumack == 1) && (tp1->sent < SCTP_DATAGRAM_RESEND) &&
 2896                                     (tp1->snd_count > 1)) {
 2897                                         tp1->whoTo->rtx_pseudo_cumack = tp1->rec.data.TSN_seq;
 2898                                         tp1->whoTo->find_rtx_pseudo_cumack = 0;
 2899                                 }
 2900                                 if (tp1->rec.data.TSN_seq == j) {
 2901                                         if (tp1->sent != SCTP_DATAGRAM_UNSENT) {
 2902                                                 /*
 2903                                                  * must be held until
 2904                                                  * cum-ack passes
 2905                                                  */
 2906                                                 /*
 2907                                                  * ECN Nonce: Add the nonce
 2908                                                  * value to the sender's
 2909                                                  * nonce sum
 2910                                                  */
 2911                                                 if (tp1->sent < SCTP_DATAGRAM_RESEND) {
 2912                                                         /*-
 2913                                                          * If it is less than RESEND, it is
 2914                                                          * now no-longer in flight.
 2915                                                          * Higher values may already be set
 2916                                                          * via previous Gap Ack Blocks...
 2917                                                          * i.e. ACKED or RESEND.
 2918                                                          */
 2919                                                         if (compare_with_wrap(tp1->rec.data.TSN_seq,
 2920                                                             *biggest_newly_acked_tsn, MAX_TSN)) {
 2921                                                                 *biggest_newly_acked_tsn = tp1->rec.data.TSN_seq;
 2922                                                         }
 2923                                                         /*
 2924                                                          * CMT: SFR algo
 2925                                                          * (and HTNA) - set
 2926                                                          * saw_newack to 1
 2927                                                          * for dest being
 2928                                                          * newly acked.
 2929                                                          * update
 2930                                                          * this_sack_highest_
 2931                                                          * newack if
 2932                                                          * appropriate.
 2933                                                          */
 2934                                                         if (tp1->rec.data.chunk_was_revoked == 0)
 2935                                                                 tp1->whoTo->saw_newack = 1;
 2936 
 2937                                                         if (compare_with_wrap(tp1->rec.data.TSN_seq,
 2938                                                             tp1->whoTo->this_sack_highest_newack,
 2939                                                             MAX_TSN)) {
 2940                                                                 tp1->whoTo->this_sack_highest_newack =
 2941                                                                     tp1->rec.data.TSN_seq;
 2942                                                         }
 2943                                                         /*
 2944                                                          * CMT DAC algo:
 2945                                                          * also update
 2946                                                          * this_sack_lowest_n
 2947                                                          * ewack
 2948                                                          */
 2949                                                         if (*this_sack_lowest_newack == 0) {
 2950                                                                 if (sctp_logging_level & SCTP_SACK_LOGGING_ENABLE) {
 2951                                                                         sctp_log_sack(*this_sack_lowest_newack,
 2952                                                                             last_tsn,
 2953                                                                             tp1->rec.data.TSN_seq,
 2954                                                                             0,
 2955                                                                             0,
 2956                                                                             SCTP_LOG_TSN_ACKED);
 2957                                                                 }
 2958                                                                 *this_sack_lowest_newack = tp1->rec.data.TSN_seq;
 2959                                                         }
 2960                                                         /*
 2961                                                          * CMT: CUCv2
 2962                                                          * algorithm. If
 2963                                                          * (rtx-)pseudo-cumac
 2964                                                          * k for corresp
 2965                                                          * dest is being
 2966                                                          * acked, then we
 2967                                                          * have a new
 2968                                                          * (rtx-)pseudo-cumac
 2969                                                          * k. Set
 2970                                                          * new_(rtx_)pseudo_c
 2971                                                          * umack to TRUE so
 2972                                                          * that the cwnd for
 2973                                                          * this dest can be
 2974                                                          * updated. Also
 2975                                                          * trigger search
 2976                                                          * for the next
 2977                                                          * expected
 2978                                                          * (rtx-)pseudo-cumac
 2979                                                          * k. Separate
 2980                                                          * pseudo_cumack
 2981                                                          * trackers for
 2982                                                          * first
 2983                                                          * transmissions and
 2984                                                          * retransmissions.
 2985                                                          */
 2986                                                         if (tp1->rec.data.TSN_seq == tp1->whoTo->pseudo_cumack) {
 2987                                                                 if (tp1->rec.data.chunk_was_revoked == 0) {
 2988                                                                         tp1->whoTo->new_pseudo_cumack = 1;
 2989                                                                 }
 2990                                                                 tp1->whoTo->find_pseudo_cumack = 1;
 2991                                                         }
 2992                                                         if (sctp_logging_level & SCTP_CWND_LOGGING_ENABLE) {
 2993                                                                 sctp_log_cwnd(stcb, tp1->whoTo, tp1->rec.data.TSN_seq, SCTP_CWND_LOG_FROM_SACK);
 2994                                                         }
 2995                                                         if (tp1->rec.data.TSN_seq == tp1->whoTo->rtx_pseudo_cumack) {
 2996                                                                 if (tp1->rec.data.chunk_was_revoked == 0) {
 2997                                                                         tp1->whoTo->new_pseudo_cumack = 1;
 2998                                                                 }
 2999                                                                 tp1->whoTo->find_rtx_pseudo_cumack = 1;
 3000                                                         }
 3001                                                         if (sctp_logging_level & SCTP_SACK_LOGGING_ENABLE) {
 3002                                                                 sctp_log_sack(*biggest_newly_acked_tsn,
 3003                                                                     last_tsn,
 3004                                                                     tp1->rec.data.TSN_seq,
 3005                                                                     frag_strt,
 3006                                                                     frag_end,
 3007                                                                     SCTP_LOG_TSN_ACKED);
 3008                                                         }
 3009                                                         if (sctp_logging_level & SCTP_FLIGHT_LOGGING_ENABLE) {
 3010                                                                 sctp_misc_ints(SCTP_FLIGHT_LOG_DOWN_GAP,
 3011                                                                     tp1->whoTo->flight_size,
 3012                                                                     tp1->book_size,
 3013                                                                     (uintptr_t) tp1->whoTo,
 3014                                                                     tp1->rec.data.TSN_seq);
 3015                                                         }
 3016                                                         sctp_flight_size_decrease(tp1);
 3017                                                         sctp_total_flight_decrease(stcb, tp1);
 3018 
 3019                                                         tp1->whoTo->net_ack += tp1->send_size;
 3020                                                         if (tp1->snd_count < 2) {
 3021                                                                 /*
 3022                                                                  * True
 3023                                                                  * non-retran
 3024                                                                  * smited
 3025                                                                  * chunk */
 3026                                                                 tp1->whoTo->net_ack2 += tp1->send_size;
 3027 
 3028                                                                 /*
 3029                                                                  * update RTO
 3030                                                                  * too ? */
 3031                                                                 if (tp1->do_rtt) {
 3032                                                                         tp1->whoTo->RTO =
 3033                                                                             sctp_calculate_rto(stcb,
 3034                                                                             asoc,
 3035                                                                             tp1->whoTo,
 3036                                                                             &tp1->sent_rcv_time,
 3037                                                                             sctp_align_safe_nocopy);
 3038                                                                         tp1->do_rtt = 0;
 3039                                                                 }
 3040                                                         }
 3041                                                 }
 3042                                                 if (tp1->sent <= SCTP_DATAGRAM_RESEND) {
 3043                                                         (*ecn_seg_sums) += tp1->rec.data.ect_nonce;
 3044                                                         (*ecn_seg_sums) &= SCTP_SACK_NONCE_SUM;
 3045                                                         if (compare_with_wrap(tp1->rec.data.TSN_seq,
 3046                                                             asoc->this_sack_highest_gap,
 3047                                                             MAX_TSN)) {
 3048                                                                 asoc->this_sack_highest_gap =
 3049                                                                     tp1->rec.data.TSN_seq;
 3050                                                         }
 3051                                                         if (tp1->sent == SCTP_DATAGRAM_RESEND) {
 3052                                                                 sctp_ucount_decr(asoc->sent_queue_retran_cnt);
 3053 #ifdef SCTP_AUDITING_ENABLED
 3054                                                                 sctp_audit_log(0xB2,
 3055                                                                     (asoc->sent_queue_retran_cnt & 0x000000ff));
 3056 #endif
 3057                                                         }
 3058                                                 }
 3059                                                 /*
 3060                                                  * All chunks NOT UNSENT
 3061                                                  * fall through here and are
 3062                                                  * marked
 3063                                                  */
 3064                                                 tp1->sent = SCTP_DATAGRAM_MARKED;
 3065                                                 if (tp1->rec.data.chunk_was_revoked) {
 3066                                                         /* deflate the cwnd */
 3067                                                         tp1->whoTo->cwnd -= tp1->book_size;
 3068                                                         tp1->rec.data.chunk_was_revoked = 0;
 3069                                                 }
 3070                                         }
 3071                                         break;
 3072                                 }       /* if (tp1->TSN_seq == j) */
 3073                                 if (compare_with_wrap(tp1->rec.data.TSN_seq, j,
 3074                                     MAX_TSN))
 3075                                         break;
 3076 
 3077                                 tp1 = TAILQ_NEXT(tp1, sctp_next);
 3078                         }       /* end while (tp1) */
 3079                 }               /* end for (j = fragStart */
 3080                 frag = (struct sctp_gap_ack_block *)sctp_m_getptr(m, *offset,
 3081                     sizeof(struct sctp_gap_ack_block), (uint8_t *) & block);
 3082                 *offset += sizeof(block);
 3083                 if (frag == NULL) {
 3084                         break;
 3085                 }
 3086         }
 3087         if (sctp_logging_level & SCTP_FR_LOGGING_ENABLE) {
 3088                 if (num_frs)
 3089                         sctp_log_fr(*biggest_tsn_acked,
 3090                             *biggest_newly_acked_tsn,
 3091                             last_tsn, SCTP_FR_LOG_BIGGEST_TSNS);
 3092         }
 3093 }
 3094 
 3095 static void
 3096 sctp_check_for_revoked(struct sctp_tcb *stcb,
 3097     struct sctp_association *asoc, uint32_t cumack,
 3098     u_long biggest_tsn_acked)
 3099 {
 3100         struct sctp_tmit_chunk *tp1;
 3101         int tot_revoked = 0;
 3102 
 3103         tp1 = TAILQ_FIRST(&asoc->sent_queue);
 3104         while (tp1) {
 3105                 if (compare_with_wrap(tp1->rec.data.TSN_seq, cumack,
 3106                     MAX_TSN)) {
 3107                         /*
 3108                          * ok this guy is either ACK or MARKED. If it is
 3109                          * ACKED it has been previously acked but not this
 3110                          * time i.e. revoked.  If it is MARKED it was ACK'ed
 3111                          * again.
 3112                          */
 3113                         if (compare_with_wrap(tp1->rec.data.TSN_seq, biggest_tsn_acked,
 3114                             MAX_TSN))
 3115                                 break;
 3116 
 3117 
 3118                         if (tp1->sent == SCTP_DATAGRAM_ACKED) {
 3119                                 /* it has been revoked */
 3120                                 tp1->sent = SCTP_DATAGRAM_SENT;
 3121                                 tp1->rec.data.chunk_was_revoked = 1;
 3122                                 /*
 3123                                  * We must add this stuff back in to assure
 3124                                  * timers and such get started.
 3125                                  */
 3126                                 if (sctp_logging_level & SCTP_FLIGHT_LOGGING_ENABLE) {
 3127                                         sctp_misc_ints(SCTP_FLIGHT_LOG_UP_REVOKE,
 3128                                             tp1->whoTo->flight_size,
 3129                                             tp1->book_size,
 3130                                             (uintptr_t) tp1->whoTo,
 3131                                             tp1->rec.data.TSN_seq);
 3132                                 }
 3133                                 sctp_flight_size_increase(tp1);
 3134                                 sctp_total_flight_increase(stcb, tp1);
 3135                                 /*
 3136                                  * We inflate the cwnd to compensate for our
 3137                                  * artificial inflation of the flight_size.
 3138                                  */
 3139                                 tp1->whoTo->cwnd += tp1->book_size;
 3140                                 tot_revoked++;
 3141                                 if (sctp_logging_level & SCTP_SACK_LOGGING_ENABLE) {
 3142                                         sctp_log_sack(asoc->last_acked_seq,
 3143                                             cumack,
 3144                                             tp1->rec.data.TSN_seq,
 3145                                             0,
 3146                                             0,
 3147                                             SCTP_LOG_TSN_REVOKED);
 3148                                 }
 3149                         } else if (tp1->sent == SCTP_DATAGRAM_MARKED) {
 3150                                 /* it has been re-acked in this SACK */
 3151                                 tp1->sent = SCTP_DATAGRAM_ACKED;
 3152                         }
 3153                 }
 3154                 if (tp1->sent == SCTP_DATAGRAM_UNSENT)
 3155                         break;
 3156                 tp1 = TAILQ_NEXT(tp1, sctp_next);
 3157         }
 3158         if (tot_revoked > 0) {
 3159                 /*
 3160                  * Setup the ecn nonce re-sync point. We do this since once
 3161                  * data is revoked we begin to retransmit things, which do
 3162                  * NOT have the ECN bits set. This means we are now out of
 3163                  * sync and must wait until we get back in sync with the
 3164                  * peer to check ECN bits.
 3165                  */
 3166                 tp1 = TAILQ_FIRST(&asoc->send_queue);
 3167                 if (tp1 == NULL) {
 3168                         asoc->nonce_resync_tsn = asoc->sending_seq;
 3169                 } else {
 3170                         asoc->nonce_resync_tsn = tp1->rec.data.TSN_seq;
 3171                 }
 3172                 asoc->nonce_wait_for_ecne = 0;
 3173                 asoc->nonce_sum_check = 0;
 3174         }
 3175 }
 3176 
 3177 static void
 3178 sctp_strike_gap_ack_chunks(struct sctp_tcb *stcb, struct sctp_association *asoc,
 3179     u_long biggest_tsn_acked, u_long biggest_tsn_newly_acked, u_long this_sack_lowest_newack, int accum_moved)
 3180 {
 3181         struct sctp_tmit_chunk *tp1;
 3182         int strike_flag = 0;
 3183         struct timeval now;
 3184         int tot_retrans = 0;
 3185         uint32_t sending_seq;
 3186         struct sctp_nets *net;
 3187         int num_dests_sacked = 0;
 3188 
 3189         /*
 3190          * select the sending_seq, this is either the next thing ready to be
 3191          * sent but not transmitted, OR, the next seq we assign.
 3192          */
 3193         tp1 = TAILQ_FIRST(&stcb->asoc.send_queue);
 3194         if (tp1 == NULL) {
 3195                 sending_seq = asoc->sending_seq;
 3196         } else {
 3197                 sending_seq = tp1->rec.data.TSN_seq;
 3198         }
 3199 
 3200         /* CMT DAC algo: finding out if SACK is a mixed SACK */
 3201         if (sctp_cmt_on_off && sctp_cmt_use_dac) {
 3202                 TAILQ_FOREACH(net, &asoc->nets, sctp_next) {
 3203                         if (net->saw_newack)
 3204                                 num_dests_sacked++;
 3205                 }
 3206         }
 3207         if (stcb->asoc.peer_supports_prsctp) {
 3208                 (void)SCTP_GETTIME_TIMEVAL(&now);
 3209         }
 3210         tp1 = TAILQ_FIRST(&asoc->sent_queue);
 3211         while (tp1) {
 3212                 strike_flag = 0;
 3213                 if (tp1->no_fr_allowed) {
 3214                         /* this one had a timeout or something */
 3215                         tp1 = TAILQ_NEXT(tp1, sctp_next);
 3216                         continue;
 3217                 }
 3218                 if (sctp_logging_level & SCTP_FR_LOGGING_ENABLE) {
 3219                         if (tp1->sent < SCTP_DATAGRAM_RESEND)
 3220                                 sctp_log_fr(biggest_tsn_newly_acked,
 3221                                     tp1->rec.data.TSN_seq,
 3222                                     tp1->sent,
 3223                                     SCTP_FR_LOG_CHECK_STRIKE);
 3224                 }
 3225                 if (compare_with_wrap(tp1->rec.data.TSN_seq, biggest_tsn_acked,
 3226                     MAX_TSN) ||
 3227                     tp1->sent == SCTP_DATAGRAM_UNSENT) {
 3228                         /* done */
 3229                         break;
 3230                 }
 3231                 if (stcb->asoc.peer_supports_prsctp) {
 3232                         if ((PR_SCTP_TTL_ENABLED(tp1->flags)) && tp1->sent < SCTP_DATAGRAM_ACKED) {
 3233                                 /* Is it expired? */
 3234                                 if (
 3235                                     (timevalcmp(&now, &tp1->rec.data.timetodrop, >))
 3236                                     ) {
 3237                                         /* Yes so drop it */
 3238                                         if (tp1->data != NULL) {
 3239                                                 (void)sctp_release_pr_sctp_chunk(stcb, tp1,
 3240                                                     (SCTP_RESPONSE_TO_USER_REQ | SCTP_NOTIFY_DATAGRAM_SENT),
 3241                                                     &asoc->sent_queue, SCTP_SO_NOT_LOCKED);
 3242                                         }
 3243                                         tp1 = TAILQ_NEXT(tp1, sctp_next);
 3244                                         continue;
 3245                                 }
 3246                         }
 3247                         if ((PR_SCTP_RTX_ENABLED(tp1->flags)) && tp1->sent < SCTP_DATAGRAM_ACKED) {
 3248                                 /* Has it been retransmitted tv_sec times? */
 3249                                 if (tp1->snd_count > tp1->rec.data.timetodrop.tv_sec) {
 3250                                         /* Yes, so drop it */
 3251                                         if (tp1->data != NULL) {
 3252                                                 (void)sctp_release_pr_sctp_chunk(stcb, tp1,
 3253                                                     (SCTP_RESPONSE_TO_USER_REQ | SCTP_NOTIFY_DATAGRAM_SENT),
 3254                                                     &asoc->sent_queue, SCTP_SO_NOT_LOCKED);
 3255                                         }
 3256                                         tp1 = TAILQ_NEXT(tp1, sctp_next);
 3257                                         continue;
 3258                                 }
 3259                         }
 3260                 }
 3261                 if (compare_with_wrap(tp1->rec.data.TSN_seq,
 3262                     asoc->this_sack_highest_gap, MAX_TSN)) {
 3263                         /* we are beyond the tsn in the sack  */
 3264                         break;
 3265                 }
 3266                 if (tp1->sent >= SCTP_DATAGRAM_RESEND) {
 3267                         /* either a RESEND, ACKED, or MARKED */
 3268                         /* skip */
 3269                         tp1 = TAILQ_NEXT(tp1, sctp_next);
 3270                         continue;
 3271                 }
 3272                 /*
 3273                  * CMT : SFR algo (covers part of DAC and HTNA as well)
 3274                  */
 3275                 if (tp1->whoTo && tp1->whoTo->saw_newack == 0) {
 3276                         /*
 3277                          * No new acks were receieved for data sent to this
 3278                          * dest. Therefore, according to the SFR algo for
 3279                          * CMT, no data sent to this dest can be marked for
 3280                          * FR using this SACK.
 3281                          */
 3282                         tp1 = TAILQ_NEXT(tp1, sctp_next);
 3283                         continue;
 3284                 } else if (tp1->whoTo && compare_with_wrap(tp1->rec.data.TSN_seq,
 3285                     tp1->whoTo->this_sack_highest_newack, MAX_TSN)) {
 3286                         /*
 3287                          * CMT: New acks were receieved for data sent to
 3288                          * this dest. But no new acks were seen for data
 3289                          * sent after tp1. Therefore, according to the SFR
 3290                          * algo for CMT, tp1 cannot be marked for FR using
 3291                          * this SACK. This step covers part of the DAC algo
 3292                          * and the HTNA algo as well.
 3293                          */
 3294                         tp1 = TAILQ_NEXT(tp1, sctp_next);
 3295                         continue;
 3296                 }
 3297                 /*
 3298                  * Here we check to see if we were have already done a FR
 3299                  * and if so we see if the biggest TSN we saw in the sack is
 3300                  * smaller than the recovery point. If so we don't strike
 3301                  * the tsn... otherwise we CAN strike the TSN.
 3302                  */
 3303                 /*
 3304                  * @@@ JRI: Check for CMT if (accum_moved &&
 3305                  * asoc->fast_retran_loss_recovery && (sctp_cmt_on_off ==
 3306                  * 0)) {
 3307                  */
 3308                 if (accum_moved && asoc->fast_retran_loss_recovery) {
 3309                         /*
 3310                          * Strike the TSN if in fast-recovery and cum-ack
 3311                          * moved.
 3312                          */
 3313                         if (sctp_logging_level & SCTP_FR_LOGGING_ENABLE) {
 3314                                 sctp_log_fr(biggest_tsn_newly_acked,
 3315                                     tp1->rec.data.TSN_seq,
 3316                                     tp1->sent,
 3317                                     SCTP_FR_LOG_STRIKE_CHUNK);
 3318                         }
 3319                         if (tp1->sent < SCTP_DATAGRAM_RESEND) {
 3320                                 tp1->sent++;
 3321                         }
 3322                         if (sctp_cmt_on_off && sctp_cmt_use_dac) {
 3323                                 /*
 3324                                  * CMT DAC algorithm: If SACK flag is set to
 3325                                  * 0, then lowest_newack test will not pass
 3326                                  * because it would have been set to the
 3327                                  * cumack earlier. If not already to be
 3328                                  * rtx'd, If not a mixed sack and if tp1 is
 3329                                  * not between two sacked TSNs, then mark by
 3330                                  * one more. NOTE that we are marking by one
 3331                                  * additional time since the SACK DAC flag
 3332                                  * indicates that two packets have been
 3333                                  * received after this missing TSN.
 3334                                  */
 3335                                 if ((tp1->sent < SCTP_DATAGRAM_RESEND) && (num_dests_sacked == 1) &&
 3336                                     compare_with_wrap(this_sack_lowest_newack, tp1->rec.data.TSN_seq, MAX_TSN)) {
 3337                                         if (sctp_logging_level & SCTP_FR_LOGGING_ENABLE) {
 3338                                                 sctp_log_fr(16 + num_dests_sacked,
 3339                                                     tp1->rec.data.TSN_seq,
 3340                                                     tp1->sent,
 3341                                                     SCTP_FR_LOG_STRIKE_CHUNK);
 3342                                         }
 3343                                         tp1->sent++;
 3344                                 }
 3345                         }
 3346                 } else if (tp1->rec.data.doing_fast_retransmit) {
 3347                         /*
 3348                          * For those that have done a FR we must take
 3349                          * special consideration if we strike. I.e the
 3350                          * biggest_newly_acked must be higher than the
 3351                          * sending_seq at the time we did the FR.
 3352                          */
 3353                         if (
 3354 #ifdef SCTP_FR_TO_ALTERNATE
 3355                         /*
 3356                          * If FR's go to new networks, then we must only do
 3357                          * this for singly homed asoc's. However if the FR's
 3358                          * go to the same network (Armando's work) then its
 3359                          * ok to FR multiple times.
 3360                          */
 3361                             (asoc->numnets < 2)
 3362 #else
 3363                             (1)
 3364 #endif
 3365                             ) {
 3366 
 3367                                 if ((compare_with_wrap(biggest_tsn_newly_acked,
 3368                                     tp1->rec.data.fast_retran_tsn, MAX_TSN)) ||
 3369                                     (biggest_tsn_newly_acked ==
 3370                                     tp1->rec.data.fast_retran_tsn)) {
 3371                                         /*
 3372                                          * Strike the TSN, since this ack is
 3373                                          * beyond where things were when we
 3374                                          * did a FR.
 3375                                          */
 3376                                         if (sctp_logging_level & SCTP_FR_LOGGING_ENABLE) {
 3377                                                 sctp_log_fr(biggest_tsn_newly_acked,
 3378                                                     tp1->rec.data.TSN_seq,
 3379                                                     tp1->sent,
 3380                                                     SCTP_FR_LOG_STRIKE_CHUNK);
 3381                                         }
 3382                                         if (tp1->sent < SCTP_DATAGRAM_RESEND) {
 3383                                                 tp1->sent++;
 3384                                         }
 3385                                         strike_flag = 1;
 3386                                         if (sctp_cmt_on_off && sctp_cmt_use_dac) {
 3387                                                 /*
 3388                                                  * CMT DAC algorithm: If
 3389                                                  * SACK flag is set to 0,
 3390                                                  * then lowest_newack test
 3391                                                  * will not pass because it
 3392                                                  * would have been set to
 3393                                                  * the cumack earlier. If
 3394                                                  * not already to be rtx'd,
 3395                                                  * If not a mixed sack and
 3396                                                  * if tp1 is not between two
 3397                                                  * sacked TSNs, then mark by
 3398                                                  * one more. NOTE that we
 3399                                                  * are marking by one
 3400                                                  * additional time since the
 3401                                                  * SACK DAC flag indicates
 3402                                                  * that two packets have
 3403                                                  * been received after this
 3404                                                  * missing TSN.
 3405                                                  */
 3406                                                 if ((tp1->sent < SCTP_DATAGRAM_RESEND) &&
 3407                                                     (num_dests_sacked == 1) &&
 3408                                                     compare_with_wrap(this_sack_lowest_newack,
 3409                                                     tp1->rec.data.TSN_seq, MAX_TSN)) {
 3410                                                         if (sctp_logging_level & SCTP_FR_LOGGING_ENABLE) {
 3411                                                                 sctp_log_fr(32 + num_dests_sacked,
 3412                                                                     tp1->rec.data.TSN_seq,
 3413                                                                     tp1->sent,
 3414                                                                     SCTP_FR_LOG_STRIKE_CHUNK);
 3415                                                         }
 3416                                                         if (tp1->sent < SCTP_DATAGRAM_RESEND) {
 3417                                                                 tp1->sent++;
 3418                                                         }
 3419                                                 }
 3420                                         }
 3421                                 }
 3422                         }
 3423                         /*
 3424                          * JRI: TODO: remove code for HTNA algo. CMT's SFR
 3425                          * algo covers HTNA.
 3426                          */
 3427                 } else if (compare_with_wrap(tp1->rec.data.TSN_seq,
 3428                     biggest_tsn_newly_acked, MAX_TSN)) {
 3429                         /*
 3430                          * We don't strike these: This is the  HTNA
 3431                          * algorithm i.e. we don't strike If our TSN is
 3432                          * larger than the Highest TSN Newly Acked.
 3433                          */
 3434                         ;
 3435                 } else {
 3436                         /* Strike the TSN */
 3437                         if (sctp_logging_level & SCTP_FR_LOGGING_ENABLE) {
 3438                                 sctp_log_fr(biggest_tsn_newly_acked,
 3439                                     tp1->rec.data.TSN_seq,
 3440                                     tp1->sent,
 3441                                     SCTP_FR_LOG_STRIKE_CHUNK);
 3442                         }
 3443                         if (tp1->sent < SCTP_DATAGRAM_RESEND) {
 3444                                 tp1->sent++;
 3445                         }
 3446                         if (sctp_cmt_on_off && sctp_cmt_use_dac) {
 3447                                 /*
 3448                                  * CMT DAC algorithm: If SACK flag is set to
 3449                                  * 0, then lowest_newack test will not pass
 3450                                  * because it would have been set to the
 3451                                  * cumack earlier. If not already to be
 3452                                  * rtx'd, If not a mixed sack and if tp1 is
 3453                                  * not between two sacked TSNs, then mark by
 3454                                  * one more. NOTE that we are marking by one
 3455                                  * additional time since the SACK DAC flag
 3456                                  * indicates that two packets have been
 3457                                  * received after this missing TSN.
 3458                                  */
 3459                                 if ((tp1->sent < SCTP_DATAGRAM_RESEND) && (num_dests_sacked == 1) &&
 3460                                     compare_with_wrap(this_sack_lowest_newack, tp1->rec.data.TSN_seq, MAX_TSN)) {
 3461                                         if (sctp_logging_level & SCTP_FR_LOGGING_ENABLE) {
 3462                                                 sctp_log_fr(48 + num_dests_sacked,
 3463                                                     tp1->rec.data.TSN_seq,
 3464                                                     tp1->sent,
 3465                                                     SCTP_FR_LOG_STRIKE_CHUNK);
 3466                                         }
 3467                                         tp1->sent++;
 3468                                 }
 3469                         }
 3470                 }
 3471                 if (tp1->sent == SCTP_DATAGRAM_RESEND) {
 3472                         /* Increment the count to resend */
 3473                         struct sctp_nets *alt;
 3474 
 3475                         /* printf("OK, we are now ready to FR this guy\n"); */
 3476                         if (sctp_logging_level & SCTP_FR_LOGGING_ENABLE) {
 3477                                 sctp_log_fr(tp1->rec.data.TSN_seq, tp1->snd_count,
 3478                                     0, SCTP_FR_MARKED);
 3479                         }
 3480                         if (strike_flag) {
 3481                                 /* This is a subsequent FR */
 3482                                 SCTP_STAT_INCR(sctps_sendmultfastretrans);
 3483                         }
 3484                         sctp_ucount_incr(stcb->asoc.sent_queue_retran_cnt);
 3485                         if (sctp_cmt_on_off) {
 3486                                 /*
 3487                                  * CMT: Using RTX_SSTHRESH policy for CMT.
 3488                                  * If CMT is being used, then pick dest with
 3489                                  * largest ssthresh for any retransmission.
 3490                                  */
 3491                                 tp1->no_fr_allowed = 1;
 3492                                 alt = tp1->whoTo;
 3493                                 /* sa_ignore NO_NULL_CHK */
 3494                                 if (sctp_cmt_on_off && sctp_cmt_pf) {
 3495                                         /*
 3496                                          * JRS 5/18/07 - If CMT PF is on,
 3497                                          * use the PF version of
 3498                                          * find_alt_net()
 3499                                          */
 3500                                         alt = sctp_find_alternate_net(stcb, alt, 2);
 3501                                 } else {
 3502                                         /*
 3503                                          * JRS 5/18/07 - If only CMT is on,
 3504                                          * use the CMT version of
 3505                                          * find_alt_net()
 3506                                          */
 3507                                         /* sa_ignore NO_NULL_CHK */
 3508                                         alt = sctp_find_alternate_net(stcb, alt, 1);
 3509                                 }
 3510                                 if (alt == NULL) {
 3511                                         alt = tp1->whoTo;
 3512                                 }
 3513                                 /*
 3514                                  * CUCv2: If a different dest is picked for
 3515                                  * the retransmission, then new
 3516                                  * (rtx-)pseudo_cumack needs to be tracked
 3517                                  * for orig dest. Let CUCv2 track new (rtx-)
 3518                                  * pseudo-cumack always.
 3519                                  */
 3520                                 if (tp1->whoTo) {
 3521                                         tp1->whoTo->find_pseudo_cumack = 1;
 3522                                         tp1->whoTo->find_rtx_pseudo_cumack = 1;
 3523                                 }
 3524                         } else {/* CMT is OFF */
 3525 
 3526 #ifdef SCTP_FR_TO_ALTERNATE
 3527                                 /* Can we find an alternate? */
 3528                                 alt = sctp_find_alternate_net(stcb, tp1->whoTo, 0);
 3529 #else
 3530                                 /*
 3531                                  * default behavior is to NOT retransmit
 3532                                  * FR's to an alternate. Armando Caro's
 3533                                  * paper details why.
 3534                                  */
 3535                                 alt = tp1->whoTo;
 3536 #endif
 3537                         }
 3538 
 3539                         tp1->rec.data.doing_fast_retransmit = 1;
 3540                         tot_retrans++;
 3541                         /* mark the sending seq for possible subsequent FR's */
 3542                         /*
 3543                          * printf("Marking TSN for FR new value %x\n",
 3544                          * (uint32_t)tpi->rec.data.TSN_seq);
 3545                          */
 3546                         if (TAILQ_EMPTY(&asoc->send_queue)) {
 3547                                 /*
 3548                                  * If the queue of send is empty then its
 3549                                  * the next sequence number that will be
 3550                                  * assigned so we subtract one from this to
 3551                                  * get the one we last sent.
 3552                                  */
 3553                                 tp1->rec.data.fast_retran_tsn = sending_seq;
 3554                         } else {
 3555                                 /*
 3556                                  * If there are chunks on the send queue
 3557                                  * (unsent data that has made it from the
 3558                                  * stream queues but not out the door, we
 3559                                  * take the first one (which will have the
 3560                                  * lowest TSN) and subtract one to get the
 3561                                  * one we last sent.
 3562                                  */
 3563                                 struct sctp_tmit_chunk *ttt;
 3564 
 3565                                 ttt = TAILQ_FIRST(&asoc->send_queue);
 3566                                 tp1->rec.data.fast_retran_tsn =
 3567                                     ttt->rec.data.TSN_seq;
 3568                         }
 3569 
 3570                         if (tp1->do_rtt) {
 3571                                 /*
 3572                                  * this guy had a RTO calculation pending on
 3573                                  * it, cancel it
 3574                                  */
 3575                                 tp1->do_rtt = 0;
 3576                         }
 3577                         /* fix counts and things */
 3578                         if (sctp_logging_level & SCTP_FLIGHT_LOGGING_ENABLE) {
 3579                                 sctp_misc_ints(SCTP_FLIGHT_LOG_DOWN_RSND,
 3580                                     (tp1->whoTo ? (tp1->whoTo->flight_size) : 0),
 3581                                     tp1->book_size,
 3582                                     (uintptr_t) tp1->whoTo,
 3583                                     tp1->rec.data.TSN_seq);
 3584                         }
 3585                         if (tp1->whoTo) {
 3586                                 tp1->whoTo->net_ack++;
 3587                                 sctp_flight_size_decrease(tp1);
 3588                         }
 3589                         if (sctp_logging_level & SCTP_LOG_RWND_ENABLE) {
 3590                                 sctp_log_rwnd(SCTP_INCREASE_PEER_RWND,
 3591                                     asoc->peers_rwnd, tp1->send_size, sctp_peer_chunk_oh);
 3592                         }
 3593                         /* add back to the rwnd */
 3594                         asoc->peers_rwnd += (tp1->send_size + sctp_peer_chunk_oh);
 3595 
 3596                         /* remove from the total flight */
 3597                         sctp_total_flight_decrease(stcb, tp1);
 3598                         if (alt != tp1->whoTo) {
 3599                                 /* yes, there is an alternate. */
 3600                                 sctp_free_remote_addr(tp1->whoTo);
 3601                                 /* sa_ignore FREED_MEMORY */
 3602                                 tp1->whoTo = alt;
 3603                                 atomic_add_int(&alt->ref_count, 1);
 3604                         }
 3605                 }
 3606                 tp1 = TAILQ_NEXT(tp1, sctp_next);
 3607         }                       /* while (tp1) */
 3608 
 3609         if (tot_retrans > 0) {
 3610                 /*
 3611                  * Setup the ecn nonce re-sync point. We do this since once
 3612                  * we go to FR something we introduce a Karn's rule scenario
 3613                  * and won't know the totals for the ECN bits.
 3614                  */
 3615                 asoc->nonce_resync_tsn = sending_seq;
 3616                 asoc->nonce_wait_for_ecne = 0;
 3617                 asoc->nonce_sum_check = 0;
 3618         }
 3619 }
 3620 
 3621 struct sctp_tmit_chunk *
 3622 sctp_try_advance_peer_ack_point(struct sctp_tcb *stcb,
 3623     struct sctp_association *asoc)
 3624 {
 3625         struct sctp_tmit_chunk *tp1, *tp2, *a_adv = NULL;
 3626         struct timeval now;
 3627         int now_filled = 0;
 3628 
 3629         if (asoc->peer_supports_prsctp == 0) {
 3630                 return (NULL);
 3631         }
 3632         tp1 = TAILQ_FIRST(&asoc->sent_queue);
 3633         while (tp1) {
 3634                 if (tp1->sent != SCTP_FORWARD_TSN_SKIP &&
 3635                     tp1->sent != SCTP_DATAGRAM_RESEND) {
 3636                         /* no chance to advance, out of here */
 3637                         break;
 3638                 }
 3639                 if (!PR_SCTP_ENABLED(tp1->flags)) {
 3640                         /*
 3641                          * We can't fwd-tsn past any that are reliable aka
 3642                          * retransmitted until the asoc fails.
 3643                          */
 3644                         break;
 3645                 }
 3646                 if (!now_filled) {
 3647                         (void)SCTP_GETTIME_TIMEVAL(&now);
 3648                         now_filled = 1;
 3649                 }
 3650                 tp2 = TAILQ_NEXT(tp1, sctp_next);
 3651                 /*
 3652                  * now we got a chunk which is marked for another
 3653                  * retransmission to a PR-stream but has run out its chances
 3654                  * already maybe OR has been marked to skip now. Can we skip
 3655                  * it if its a resend?
 3656                  */
 3657                 if (tp1->sent == SCTP_DATAGRAM_RESEND &&
 3658                     (PR_SCTP_TTL_ENABLED(tp1->flags))) {
 3659                         /*
 3660                          * Now is this one marked for resend and its time is
 3661                          * now up?
 3662                          */
 3663                         if (timevalcmp(&now, &tp1->rec.data.timetodrop, >)) {
 3664                                 /* Yes so drop it */
 3665                                 if (tp1->data) {
 3666                                         (void)sctp_release_pr_sctp_chunk(stcb, tp1,
 3667                                             (SCTP_RESPONSE_TO_USER_REQ | SCTP_NOTIFY_DATAGRAM_SENT),
 3668                                             &asoc->sent_queue, SCTP_SO_NOT_LOCKED);
 3669                                 }
 3670                         } else {
 3671                                 /*
 3672                                  * No, we are done when hit one for resend
 3673                                  * whos time as not expired.
 3674                                  */
 3675                                 break;
 3676                         }
 3677                 }
 3678                 /*
 3679                  * Ok now if this chunk is marked to drop it we can clean up
 3680                  * the chunk, advance our peer ack point and we can check
 3681                  * the next chunk.
 3682                  */
 3683                 if (tp1->sent == SCTP_FORWARD_TSN_SKIP) {
 3684                         /* advance PeerAckPoint goes forward */
 3685                         asoc->advanced_peer_ack_point = tp1->rec.data.TSN_seq;
 3686                         a_adv = tp1;
 3687                         /*
 3688                          * we don't want to de-queue it here. Just wait for
 3689                          * the next peer SACK to come with a new cumTSN and
 3690                          * then the chunk will be droped in the normal
 3691                          * fashion.
 3692                          */
 3693                         if (tp1->data) {
 3694                                 sctp_free_bufspace(stcb, asoc, tp1, 1);
 3695                                 /*
 3696                                  * Maybe there should be another
 3697                                  * notification type
 3698                                  */
 3699                                 sctp_ulp_notify(SCTP_NOTIFY_DG_FAIL, stcb,
 3700                                     (SCTP_RESPONSE_TO_USER_REQ | SCTP_NOTIFY_DATAGRAM_SENT),
 3701                                     tp1, SCTP_SO_NOT_LOCKED);
 3702                                 sctp_m_freem(tp1->data);
 3703                                 tp1->data = NULL;
 3704                                 if (stcb->sctp_socket) {
 3705 #if defined (__APPLE__) || defined(SCTP_SO_LOCK_TESTING)
 3706                                         struct socket *so;
 3707 
 3708                                         so = SCTP_INP_SO(stcb->sctp_ep);
 3709                                         atomic_add_int(&stcb->asoc.refcnt, 1);
 3710                                         SCTP_TCB_UNLOCK(stcb);
 3711                                         SCTP_SOCKET_LOCK(so, 1);
 3712                                         SCTP_TCB_LOCK(stcb);
 3713                                         atomic_subtract_int(&stcb->asoc.refcnt, 1);
 3714                                         if (stcb->asoc.state & SCTP_STATE_CLOSED_SOCKET) {
 3715                                                 /*
 3716                                                  * assoc was freed while we
 3717                                                  * were unlocked
 3718                                                  */
 3719                                                 SCTP_SOCKET_UNLOCK(so, 1);
 3720                                                 return (NULL);
 3721                                         }
 3722 #endif
 3723                                         sctp_sowwakeup(stcb->sctp_ep, stcb->sctp_socket);
 3724 #if defined (__APPLE__) || defined(SCTP_SO_LOCK_TESTING)
 3725                                         SCTP_SOCKET_UNLOCK(so, 1);
 3726 #endif
 3727                                         if (sctp_logging_level & SCTP_WAKE_LOGGING_ENABLE) {
 3728                                                 sctp_wakeup_log(stcb, tp1->rec.data.TSN_seq, 1, SCTP_WAKESND_FROM_FWDTSN);
 3729                                         }
 3730                                 }
 3731                         }
 3732                 } else {
 3733                         /*
 3734                          * If it is still in RESEND we can advance no
 3735                          * further
 3736                          */
 3737                         break;
 3738                 }
 3739                 /*
 3740                  * If we hit here we just dumped tp1, move to next tsn on
 3741                  * sent queue.
 3742                  */
 3743                 tp1 = tp2;
 3744         }
 3745         return (a_adv);
 3746 }
 3747 
 3748 static void
 3749 sctp_fs_audit(struct sctp_association *asoc)
 3750 {
 3751         struct sctp_tmit_chunk *chk;
 3752         int inflight = 0, resend = 0, inbetween = 0, acked = 0, above = 0;
 3753 
 3754         TAILQ_FOREACH(chk, &asoc->sent_queue, sctp_next) {
 3755                 if (chk->sent < SCTP_DATAGRAM_RESEND) {
 3756                         inflight++;
 3757                 } else if (chk->sent == SCTP_DATAGRAM_RESEND) {
 3758                         resend++;
 3759                 } else if (chk->sent < SCTP_DATAGRAM_ACKED) {
 3760                         inbetween++;
 3761                 } else if (chk->sent > SCTP_DATAGRAM_ACKED) {
 3762                         above++;
 3763                 } else {
 3764                         acked++;
 3765                 }
 3766         }
 3767 
 3768         if ((inflight > 0) || (inbetween > 0)) {
 3769 #ifdef INVARIANTS
 3770                 panic("Flight size-express incorrect? \n");
 3771 #else
 3772                 SCTP_PRINTF("Flight size-express incorrect inflight:%d inbetween:%d\n",
 3773                     inflight, inbetween);
 3774 #endif
 3775         }
 3776 }
 3777 
 3778 
 3779 static void
 3780 sctp_window_probe_recovery(struct sctp_tcb *stcb,
 3781     struct sctp_association *asoc,
 3782     struct sctp_nets *net,
 3783     struct sctp_tmit_chunk *tp1)
 3784 {
 3785         struct sctp_tmit_chunk *chk;
 3786 
 3787         /* First setup this one and get it moved back */
 3788         tp1->sent = SCTP_DATAGRAM_UNSENT;
 3789         if (sctp_logging_level & SCTP_FLIGHT_LOGGING_ENABLE) {
 3790                 sctp_misc_ints(SCTP_FLIGHT_LOG_DOWN_WP,
 3791                     tp1->whoTo->flight_size,
 3792                     tp1->book_size,
 3793                     (uintptr_t) tp1->whoTo,
 3794                     tp1->rec.data.TSN_seq);
 3795         }
 3796         sctp_flight_size_decrease(tp1);
 3797         sctp_total_flight_decrease(stcb, tp1);
 3798         TAILQ_REMOVE(&asoc->sent_queue, tp1, sctp_next);
 3799         TAILQ_INSERT_HEAD(&asoc->send_queue, tp1, sctp_next);
 3800         asoc->sent_queue_cnt--;
 3801         asoc->send_queue_cnt++;
 3802         /*
 3803          * Now all guys marked for RESEND on the sent_queue must be moved
 3804          * back too.
 3805          */
 3806         TAILQ_FOREACH(chk, &asoc->sent_queue, sctp_next) {
 3807                 if (chk->sent == SCTP_DATAGRAM_RESEND) {
 3808                         /* Another chunk to move */
 3809                         chk->sent = SCTP_DATAGRAM_UNSENT;
 3810                         /* It should not be in flight */
 3811                         TAILQ_REMOVE(&asoc->sent_queue, chk, sctp_next);
 3812                         TAILQ_INSERT_AFTER(&asoc->send_queue, tp1, chk, sctp_next);
 3813                         asoc->sent_queue_cnt--;
 3814                         asoc->send_queue_cnt++;
 3815                         sctp_ucount_decr(asoc->sent_queue_retran_cnt);
 3816                 }
 3817         }
 3818 }
 3819 
 3820 void
 3821 sctp_express_handle_sack(struct sctp_tcb *stcb, uint32_t cumack,
 3822     uint32_t rwnd, int nonce_sum_flag, int *abort_now)
 3823 {
 3824         struct sctp_nets *net;
 3825         struct sctp_association *asoc;
 3826         struct sctp_tmit_chunk *tp1, *tp2;
 3827         uint32_t old_rwnd;
 3828         int win_probe_recovery = 0;
 3829         int win_probe_recovered = 0;
 3830         int j, done_once = 0;
 3831 
 3832         if (sctp_logging_level & SCTP_LOG_SACK_ARRIVALS_ENABLE) {
 3833                 sctp_misc_ints(SCTP_SACK_LOG_EXPRESS, cumack,
 3834                     rwnd, stcb->asoc.last_acked_seq, stcb->asoc.peers_rwnd);
 3835         }
 3836         SCTP_TCB_LOCK_ASSERT(stcb);
 3837 #ifdef SCTP_ASOCLOG_OF_TSNS
 3838         stcb->asoc.cumack_log[stcb->asoc.cumack_log_at] = cumack;
 3839         stcb->asoc.cumack_log_at++;
 3840         if (stcb->asoc.cumack_log_at > SCTP_TSN_LOG_SIZE) {
 3841                 stcb->asoc.cumack_log_at = 0;
 3842         }
 3843 #endif
 3844         asoc = &stcb->asoc;
 3845         old_rwnd = asoc->peers_rwnd;
 3846         if (compare_with_wrap(asoc->last_acked_seq, cumack, MAX_TSN)) {
 3847                 /* old ack */
 3848                 return;
 3849         } else if (asoc->last_acked_seq == cumack) {
 3850                 /* Window update sack */
 3851                 asoc->peers_rwnd = sctp_sbspace_sub(rwnd,
 3852                     (uint32_t) (asoc->total_flight + (asoc->sent_queue_cnt * sctp_peer_chunk_oh)));
 3853                 if (asoc->peers_rwnd < stcb->sctp_ep->sctp_ep.sctp_sws_sender) {
 3854                         /* SWS sender side engages */
 3855                         asoc->peers_rwnd = 0;
 3856                 }
 3857                 if (asoc->peers_rwnd > old_rwnd) {
 3858                         goto again;
 3859                 }
 3860                 return;
 3861         }
 3862         /* First setup for CC stuff */
 3863         TAILQ_FOREACH(net, &asoc->nets, sctp_next) {
 3864                 net->prev_cwnd = net->cwnd;
 3865                 net->net_ack = 0;
 3866                 net->net_ack2 = 0;
 3867 
 3868                 /*
 3869                  * CMT: Reset CUC and Fast recovery algo variables before
 3870                  * SACK processing
 3871                  */
 3872                 net->new_pseudo_cumack = 0;
 3873                 net->will_exit_fast_recovery = 0;
 3874         }
 3875         if (sctp_strict_sacks) {
 3876                 uint32_t send_s;
 3877 
 3878                 if (!TAILQ_EMPTY(&asoc->sent_queue)) {
 3879                         tp1 = TAILQ_LAST(&asoc->sent_queue,
 3880                             sctpchunk_listhead);
 3881                         send_s = tp1->rec.data.TSN_seq + 1;
 3882                 } else {
 3883                         send_s = asoc->sending_seq;
 3884                 }
 3885                 if ((cumack == send_s) ||
 3886                     compare_with_wrap(cumack, send_s, MAX_TSN)) {
 3887 #ifndef INVARIANTS
 3888                         struct mbuf *oper;
 3889 
 3890 #endif
 3891 #ifdef INVARIANTS
 3892                         panic("Impossible sack 1");
 3893 #else
 3894                         *abort_now = 1;
 3895                         /* XXX */
 3896                         oper = sctp_get_mbuf_for_msg((sizeof(struct sctp_paramhdr) + sizeof(uint32_t)),
 3897                             0, M_DONTWAIT, 1, MT_DATA);
 3898                         if (oper) {
 3899                                 struct sctp_paramhdr *ph;
 3900                                 uint32_t *ippp;
 3901 
 3902                                 SCTP_BUF_LEN(oper) = sizeof(struct sctp_paramhdr) +
 3903                                     sizeof(uint32_t);
 3904                                 ph = mtod(oper, struct sctp_paramhdr *);
 3905                                 ph->param_type = htons(SCTP_CAUSE_PROTOCOL_VIOLATION);
 3906                                 ph->param_length = htons(SCTP_BUF_LEN(oper));
 3907                                 ippp = (uint32_t *) (ph + 1);
 3908                                 *ippp = htonl(SCTP_FROM_SCTP_INDATA + SCTP_LOC_25);
 3909                         }
 3910                         stcb->sctp_ep->last_abort_code = SCTP_FROM_SCTP_INDATA + SCTP_LOC_25;
 3911                         sctp_abort_an_association(stcb->sctp_ep, stcb, SCTP_PEER_FAULTY, oper, SCTP_SO_NOT_LOCKED);
 3912                         return;
 3913 #endif
 3914                 }
 3915         }
 3916         asoc->this_sack_highest_gap = cumack;
 3917         if (sctp_logging_level & SCTP_THRESHOLD_LOGGING) {
 3918                 sctp_misc_ints(SCTP_THRESHOLD_CLEAR,
 3919                     stcb->asoc.overall_error_count,
 3920                     0,
 3921                     SCTP_FROM_SCTP_INDATA,
 3922                     __LINE__);
 3923         }
 3924         stcb->asoc.overall_error_count = 0;
 3925         if (compare_with_wrap(cumack, asoc->last_acked_seq, MAX_TSN)) {
 3926                 /* process the new consecutive TSN first */
 3927                 tp1 = TAILQ_FIRST(&asoc->sent_queue);
 3928                 while (tp1) {
 3929                         tp2 = TAILQ_NEXT(tp1, sctp_next);
 3930                         if (compare_with_wrap(cumack, tp1->rec.data.TSN_seq,
 3931                             MAX_TSN) ||
 3932                             cumack == tp1->rec.data.TSN_seq) {
 3933                                 if (tp1->sent == SCTP_DATAGRAM_UNSENT) {
 3934                                         printf("Warning, an unsent is now acked?\n");
 3935                                 }
 3936                                 /*
 3937                                  * ECN Nonce: Add the nonce to the sender's
 3938                                  * nonce sum
 3939                                  */
 3940                                 asoc->nonce_sum_expect_base += tp1->rec.data.ect_nonce;
 3941                                 if (tp1->sent < SCTP_DATAGRAM_ACKED) {
 3942                                         /*
 3943                                          * If it is less than ACKED, it is
 3944                                          * now no-longer in flight. Higher
 3945                                          * values may occur during marking
 3946                                          */
 3947                                         if (tp1->sent < SCTP_DATAGRAM_RESEND) {
 3948                                                 if (sctp_logging_level & SCTP_FLIGHT_LOGGING_ENABLE) {
 3949                                                         sctp_misc_ints(SCTP_FLIGHT_LOG_DOWN_CA,
 3950                                                             tp1->whoTo->flight_size,
 3951                                                             tp1->book_size,
 3952                                                             (uintptr_t) tp1->whoTo,
 3953                                                             tp1->rec.data.TSN_seq);
 3954                                                 }
 3955                                                 sctp_flight_size_decrease(tp1);
 3956                                                 /* sa_ignore NO_NULL_CHK */
 3957                                                 sctp_total_flight_decrease(stcb, tp1);
 3958                                         }
 3959                                         tp1->whoTo->net_ack += tp1->send_size;
 3960                                         if (tp1->snd_count < 2) {
 3961                                                 /*
 3962                                                  * True non-retransmited
 3963                                                  * chunk
 3964                                                  */
 3965                                                 tp1->whoTo->net_ack2 +=
 3966                                                     tp1->send_size;
 3967 
 3968                                                 /* update RTO too? */
 3969                                                 if (tp1->do_rtt) {
 3970                                                         tp1->whoTo->RTO =
 3971                                                         /*
 3972                                                          * sa_ignore
 3973                                                          * NO_NULL_CHK
 3974                                                          */
 3975                                                             sctp_calculate_rto(stcb,
 3976                                                             asoc, tp1->whoTo,
 3977                                                             &tp1->sent_rcv_time,
 3978                                                             sctp_align_safe_nocopy);
 3979                                                         tp1->do_rtt = 0;
 3980                                                 }
 3981                                         }
 3982                                         /*
 3983                                          * CMT: CUCv2 algorithm. From the
 3984                                          * cumack'd TSNs, for each TSN being
 3985                                          * acked for the first time, set the
 3986                                          * following variables for the
 3987                                          * corresp destination.
 3988                                          * new_pseudo_cumack will trigger a
 3989                                          * cwnd update.
 3990                                          * find_(rtx_)pseudo_cumack will
 3991                                          * trigger search for the next
 3992                                          * expected (rtx-)pseudo-cumack.
 3993                                          */
 3994                                         tp1->whoTo->new_pseudo_cumack = 1;
 3995                                         tp1->whoTo->find_pseudo_cumack = 1;
 3996                                         tp1->whoTo->find_rtx_pseudo_cumack = 1;
 3997 
 3998                                         if (sctp_logging_level & SCTP_CWND_LOGGING_ENABLE) {
 3999                                                 /* sa_ignore NO_NULL_CHK */
 4000                                                 sctp_log_cwnd(stcb, tp1->whoTo, tp1->rec.data.TSN_seq, SCTP_CWND_LOG_FROM_SACK);
 4001                                         }
 4002                                 }
 4003                                 if (tp1->sent == SCTP_DATAGRAM_RESEND) {
 4004                                         sctp_ucount_decr(asoc->sent_queue_retran_cnt);
 4005                                 }
 4006                                 if (tp1->rec.data.chunk_was_revoked) {
 4007                                         /* deflate the cwnd */
 4008                                         tp1->whoTo->cwnd -= tp1->book_size;
 4009                                         tp1->rec.data.chunk_was_revoked = 0;
 4010                                 }
 4011                                 tp1->sent = SCTP_DATAGRAM_ACKED;
 4012                                 TAILQ_REMOVE(&asoc->sent_queue, tp1, sctp_next);
 4013                                 if (tp1->data) {
 4014                                         /* sa_ignore NO_NULL_CHK */
 4015                                         sctp_free_bufspace(stcb, asoc, tp1, 1);
 4016                                         sctp_m_freem(tp1->data);
 4017                                 }
 4018                                 if (sctp_logging_level & SCTP_SACK_LOGGING_ENABLE) {
 4019                                         sctp_log_sack(asoc->last_acked_seq,
 4020                                             cumack,
 4021                                             tp1->rec.data.TSN_seq,
 4022                                             0,
 4023                                             0,
 4024                                             SCTP_LOG_FREE_SENT);
 4025                                 }
 4026                                 tp1->data = NULL;
 4027                                 asoc->sent_queue_cnt--;
 4028                                 sctp_free_a_chunk(stcb, tp1);
 4029                                 tp1 = tp2;
 4030                         } else {
 4031                                 break;
 4032                         }
 4033                 }
 4034 
 4035         }
 4036         /* sa_ignore NO_NULL_CHK */
 4037         if (stcb->sctp_socket) {
 4038 #if defined (__APPLE__) || defined(SCTP_SO_LOCK_TESTING)
 4039                 struct socket *so;
 4040 
 4041 #endif
 4042 
 4043                 SOCKBUF_LOCK(&stcb->sctp_socket->so_snd);
 4044                 if (sctp_logging_level & SCTP_WAKE_LOGGING_ENABLE) {
 4045                         /* sa_ignore NO_NULL_CHK */
 4046                         sctp_wakeup_log(stcb, cumack, 1, SCTP_WAKESND_FROM_SACK);
 4047                 }
 4048 #if defined (__APPLE__) || defined(SCTP_SO_LOCK_TESTING)
 4049                 so = SCTP_INP_SO(stcb->sctp_ep);
 4050                 atomic_add_int(&stcb->asoc.refcnt, 1);
 4051                 SCTP_TCB_UNLOCK(stcb);
 4052                 SCTP_SOCKET_LOCK(so, 1);
 4053                 SCTP_TCB_LOCK(stcb);
 4054                 atomic_subtract_int(&stcb->asoc.refcnt, 1);
 4055                 if (stcb->asoc.state & SCTP_STATE_CLOSED_SOCKET) {
 4056                         /* assoc was freed while we were unlocked */
 4057                         SCTP_SOCKET_UNLOCK(so, 1);
 4058                         return;
 4059                 }
 4060 #endif
 4061                 sctp_sowwakeup_locked(stcb->sctp_ep, stcb->sctp_socket);
 4062 #if defined (__APPLE__) || defined(SCTP_SO_LOCK_TESTING)
 4063                 SCTP_SOCKET_UNLOCK(so, 1);
 4064 #endif
 4065         } else {
 4066                 if (sctp_logging_level & SCTP_WAKE_LOGGING_ENABLE) {
 4067                         sctp_wakeup_log(stcb, cumack, 1, SCTP_NOWAKE_FROM_SACK);
 4068                 }
 4069         }
 4070 
 4071         /* JRS - Use the congestion control given in the CC module */
 4072         if (asoc->last_acked_seq != cumack)
 4073                 asoc->cc_functions.sctp_cwnd_update_after_sack(stcb, asoc, 1, 0, 0);
 4074 
 4075         asoc->last_acked_seq = cumack;
 4076 
 4077         if (TAILQ_EMPTY(&asoc->sent_queue)) {
 4078                 /* nothing left in-flight */
 4079                 TAILQ_FOREACH(net, &asoc->nets, sctp_next) {
 4080                         net->flight_size = 0;
 4081                         net->partial_bytes_acked = 0;
 4082                 }
 4083                 asoc->total_flight = 0;
 4084                 asoc->total_flight_count = 0;
 4085         }
 4086         /* Fix up the a-p-a-p for future PR-SCTP sends */
 4087         if (compare_with_wrap(cumack, asoc->advanced_peer_ack_point, MAX_TSN)) {
 4088                 asoc->advanced_peer_ack_point = cumack;
 4089         }
 4090         /* ECN Nonce updates */
 4091         if (asoc->ecn_nonce_allowed) {
 4092                 if (asoc->nonce_sum_check) {
 4093                         if (nonce_sum_flag != ((asoc->nonce_sum_expect_base) & SCTP_SACK_NONCE_SUM)) {
 4094                                 if (asoc->nonce_wait_for_ecne == 0) {
 4095                                         struct sctp_tmit_chunk *lchk;
 4096 
 4097                                         lchk = TAILQ_FIRST(&asoc->send_queue);
 4098                                         asoc->nonce_wait_for_ecne = 1;
 4099                                         if (lchk) {
 4100                                                 asoc->nonce_wait_tsn = lchk->rec.data.TSN_seq;
 4101                                         } else {
 4102                                                 asoc->nonce_wait_tsn = asoc->sending_seq;
 4103                                         }
 4104                                 } else {
 4105                                         if (compare_with_wrap(asoc->last_acked_seq, asoc->nonce_wait_tsn, MAX_TSN) ||
 4106                                             (asoc->last_acked_seq == asoc->nonce_wait_tsn)) {
 4107                                                 /*
 4108                                                  * Misbehaving peer. We need
 4109                                                  * to react to this guy
 4110                                                  */
 4111                                                 asoc->ecn_allowed = 0;
 4112                                                 asoc->ecn_nonce_allowed = 0;
 4113                                         }
 4114                                 }
 4115                         }
 4116                 } else {
 4117                         /* See if Resynchronization Possible */
 4118                         if (compare_with_wrap(asoc->last_acked_seq, asoc->nonce_resync_tsn, MAX_TSN)) {
 4119                                 asoc->nonce_sum_check = 1;
 4120                                 /*
 4121                                  * now we must calculate what the base is.
 4122                                  * We do this based on two things, we know
 4123                                  * the total's for all the segments
 4124                                  * gap-acked in the SACK (none), We also
 4125                                  * know the SACK's nonce sum, its in
 4126                                  * nonce_sum_flag. So we can build a truth
 4127                                  * table to back-calculate the new value of
 4128                                  * asoc->nonce_sum_expect_base:
 4129                                  * 
 4130                                  * SACK-flag-Value         Seg-Sums Base 0 0 0
 4131                                  * 1                    0 1 0 1 1 1
 4132                                  * 1 0
 4133                                  */
 4134                                 asoc->nonce_sum_expect_base = (0 ^ nonce_sum_flag) & SCTP_SACK_NONCE_SUM;
 4135                         }
 4136                 }
 4137         }
 4138         /* RWND update */
 4139         asoc->peers_rwnd = sctp_sbspace_sub(rwnd,
 4140             (uint32_t) (asoc->total_flight + (asoc->sent_queue_cnt * sctp_peer_chunk_oh)));
 4141         if (asoc->peers_rwnd < stcb->sctp_ep->sctp_ep.sctp_sws_sender) {
 4142                 /* SWS sender side engages */
 4143                 asoc->peers_rwnd = 0;
 4144         }
 4145         if (asoc->peers_rwnd > old_rwnd) {
 4146                 win_probe_recovery = 1;
 4147         }
 4148         /* Now assure a timer where data is queued at */
 4149 again:
 4150         j = 0;
 4151         TAILQ_FOREACH(net, &asoc->nets, sctp_next) {
 4152                 if (win_probe_recovery && (net->window_probe)) {
 4153                         net->window_probe = 0;
 4154                         win_probe_recovered = 1;
 4155                         /*
 4156                          * Find first chunk that was used with window probe
 4157                          * and clear the sent
 4158                          */
 4159                         /* sa_ignore FREED_MEMORY */
 4160                         TAILQ_FOREACH(tp1, &asoc->sent_queue, sctp_next) {
 4161                                 if (tp1->window_probe) {
 4162                                         /* move back to data send queue */
 4163                                         sctp_window_probe_recovery(stcb, asoc, net, tp1);
 4164                                         break;
 4165                                 }
 4166                         }
 4167                 }
 4168                 if (net->flight_size) {
 4169                         int to_ticks;
 4170 
 4171                         if (net->RTO == 0) {
 4172                                 to_ticks = MSEC_TO_TICKS(stcb->asoc.initial_rto);
 4173                         } else {
 4174                                 to_ticks = MSEC_TO_TICKS(net->RTO);
 4175                         }
 4176                         j++;
 4177                         (void)SCTP_OS_TIMER_START(&net->rxt_timer.timer, to_ticks,
 4178                             sctp_timeout_handler, &net->rxt_timer);
 4179                 } else {
 4180                         if (SCTP_OS_TIMER_PENDING(&net->rxt_timer.timer)) {
 4181                                 sctp_timer_stop(SCTP_TIMER_TYPE_SEND, stcb->sctp_ep,
 4182                                     stcb, net,
 4183                                     SCTP_FROM_SCTP_INDATA + SCTP_LOC_22);
 4184                         }
 4185                         if (sctp_early_fr) {
 4186                                 if (SCTP_OS_TIMER_PENDING(&net->fr_timer.timer)) {
 4187                                         SCTP_STAT_INCR(sctps_earlyfrstpidsck4);
 4188                                         sctp_timer_stop(SCTP_TIMER_TYPE_EARLYFR, stcb->sctp_ep, stcb, net,
 4189                                             SCTP_FROM_SCTP_INDATA + SCTP_LOC_23);
 4190                                 }
 4191                         }
 4192                 }
 4193         }
 4194         if ((j == 0) &&
 4195             (!TAILQ_EMPTY(&asoc->sent_queue)) &&
 4196             (asoc->sent_queue_retran_cnt == 0) &&
 4197             (win_probe_recovered == 0) &&
 4198             (done_once == 0)) {
 4199                 /* huh, this should not happen */
 4200                 sctp_fs_audit(asoc);
 4201                 TAILQ_FOREACH(net, &asoc->nets, sctp_next) {
 4202                         net->flight_size = 0;
 4203                 }
 4204                 asoc->total_flight = 0;
 4205                 asoc->total_flight_count = 0;
 4206                 asoc->sent_queue_retran_cnt = 0;
 4207                 TAILQ_FOREACH(tp1, &asoc->sent_queue, sctp_next) {
 4208                         if (tp1->sent < SCTP_DATAGRAM_RESEND) {
 4209                                 sctp_flight_size_increase(tp1);
 4210                                 sctp_total_flight_increase(stcb, tp1);
 4211                         } else if (tp1->sent == SCTP_DATAGRAM_RESEND) {
 4212                                 asoc->sent_queue_retran_cnt++;
 4213                         }
 4214                 }
 4215                 done_once = 1;
 4216                 goto again;
 4217         }
 4218         /**********************************/
 4219         /* Now what about shutdown issues */
 4220         /**********************************/
 4221         if (TAILQ_EMPTY(&asoc->send_queue) && TAILQ_EMPTY(&asoc->sent_queue)) {
 4222                 /* nothing left on sendqueue.. consider done */
 4223                 /* clean up */
 4224                 if ((asoc->stream_queue_cnt == 1) &&
 4225                     ((asoc->state & SCTP_STATE_SHUTDOWN_PENDING) ||
 4226                     (asoc->state & SCTP_STATE_SHUTDOWN_RECEIVED)) &&
 4227                     (asoc->locked_on_sending)
 4228                     ) {
 4229                         struct sctp_stream_queue_pending *sp;
 4230 
 4231                         /*
 4232                          * I may be in a state where we got all across.. but
 4233                          * cannot write more due to a shutdown... we abort
 4234                          * since the user did not indicate EOR in this case.
 4235                          * The sp will be cleaned during free of the asoc.
 4236                          */
 4237                         sp = TAILQ_LAST(&((asoc->locked_on_sending)->outqueue),
 4238                             sctp_streamhead);
 4239                         if ((sp) && (sp->length == 0)) {
 4240                                 /* Let cleanup code purge it */
 4241                                 if (sp->msg_is_complete) {
 4242                                         asoc->stream_queue_cnt--;
 4243                                 } else {
 4244                                         asoc->state |= SCTP_STATE_PARTIAL_MSG_LEFT;
 4245                                         asoc->locked_on_sending = NULL;
 4246                                         asoc->stream_queue_cnt--;
 4247                                 }
 4248                         }
 4249                 }
 4250                 if ((asoc->state & SCTP_STATE_SHUTDOWN_PENDING) &&
 4251                     (asoc->stream_queue_cnt == 0)) {
 4252                         if (asoc->state & SCTP_STATE_PARTIAL_MSG_LEFT) {
 4253                                 /* Need to abort here */
 4254                                 struct mbuf *oper;
 4255 
 4256                 abort_out_now:
 4257                                 *abort_now = 1;
 4258                                 /* XXX */
 4259                                 oper = sctp_get_mbuf_for_msg((sizeof(struct sctp_paramhdr) + sizeof(uint32_t)),
 4260                                     0, M_DONTWAIT, 1, MT_DATA);
 4261                                 if (oper) {
 4262                                         struct sctp_paramhdr *ph;
 4263                                         uint32_t *ippp;
 4264 
 4265                                         SCTP_BUF_LEN(oper) = sizeof(struct sctp_paramhdr) +
 4266                                             sizeof(uint32_t);
 4267                                         ph = mtod(oper, struct sctp_paramhdr *);
 4268                                         ph->param_type = htons(SCTP_CAUSE_USER_INITIATED_ABT);
 4269                                         ph->param_length = htons(SCTP_BUF_LEN(oper));
 4270                                         ippp = (uint32_t *) (ph + 1);
 4271                                         *ippp = htonl(SCTP_FROM_SCTP_INDATA + SCTP_LOC_24);
 4272                                 }
 4273                                 stcb->sctp_ep->last_abort_code = SCTP_FROM_SCTP_INDATA + SCTP_LOC_24;
 4274                                 sctp_abort_an_association(stcb->sctp_ep, stcb, SCTP_RESPONSE_TO_USER_REQ, oper, SCTP_SO_NOT_LOCKED);
 4275                         } else {
 4276                                 if ((SCTP_GET_STATE(asoc) == SCTP_STATE_OPEN) ||
 4277                                     (SCTP_GET_STATE(asoc) == SCTP_STATE_SHUTDOWN_RECEIVED)) {
 4278                                         SCTP_STAT_DECR_GAUGE32(sctps_currestab);
 4279                                 }
 4280                                 SCTP_SET_STATE(asoc, SCTP_STATE_SHUTDOWN_SENT);
 4281                                 SCTP_CLEAR_SUBSTATE(asoc, SCTP_STATE_SHUTDOWN_PENDING);
 4282                                 sctp_stop_timers_for_shutdown(stcb);
 4283                                 sctp_send_shutdown(stcb,
 4284                                     stcb->asoc.primary_destination);
 4285                                 sctp_timer_start(SCTP_TIMER_TYPE_SHUTDOWN,
 4286                                     stcb->sctp_ep, stcb, asoc->primary_destination);
 4287                                 sctp_timer_start(SCTP_TIMER_TYPE_SHUTDOWNGUARD,
 4288                                     stcb->sctp_ep, stcb, asoc->primary_destination);
 4289                         }
 4290                 } else if ((SCTP_GET_STATE(asoc) == SCTP_STATE_SHUTDOWN_RECEIVED) &&
 4291                     (asoc->stream_queue_cnt == 0)) {
 4292                         if (asoc->state & SCTP_STATE_PARTIAL_MSG_LEFT) {
 4293                                 goto abort_out_now;
 4294                         }
 4295                         SCTP_STAT_DECR_GAUGE32(sctps_currestab);
 4296                         SCTP_SET_STATE(asoc, SCTP_STATE_SHUTDOWN_ACK_SENT);
 4297                         SCTP_CLEAR_SUBSTATE(asoc, SCTP_STATE_SHUTDOWN_PENDING);
 4298                         sctp_send_shutdown_ack(stcb,
 4299                             stcb->asoc.primary_destination);
 4300 
 4301                         sctp_timer_start(SCTP_TIMER_TYPE_SHUTDOWNACK,
 4302                             stcb->sctp_ep, stcb, asoc->primary_destination);
 4303                 }
 4304         }
 4305         if (sctp_logging_level & SCTP_SACK_RWND_LOGGING_ENABLE) {
 4306                 sctp_misc_ints(SCTP_SACK_RWND_UPDATE,
 4307                     rwnd,
 4308                     stcb->asoc.peers_rwnd,
 4309                     stcb->asoc.total_flight,
 4310                     stcb->asoc.total_output_queue_size);
 4311         }
 4312 }
 4313 
 4314 void
 4315 sctp_handle_sack(struct mbuf *m, int offset,
 4316     struct sctp_sack_chunk *ch, struct sctp_tcb *stcb,
 4317     struct sctp_nets *net_from, int *abort_now, int sack_len, uint32_t rwnd)
 4318 {
 4319         struct sctp_association *asoc;
 4320         struct sctp_sack *sack;
 4321         struct sctp_tmit_chunk *tp1, *tp2;
 4322         uint32_t cum_ack, last_tsn, biggest_tsn_acked, biggest_tsn_newly_acked,
 4323                  this_sack_lowest_newack;
 4324         uint32_t sav_cum_ack;
 4325         uint16_t num_seg, num_dup;
 4326         uint16_t wake_him = 0;
 4327         unsigned int sack_length;
 4328         uint32_t send_s = 0;
 4329         long j;
 4330         int accum_moved = 0;
 4331         int will_exit_fast_recovery = 0;
 4332         uint32_t a_rwnd, old_rwnd;
 4333         int win_probe_recovery = 0;
 4334         int win_probe_recovered = 0;
 4335         struct sctp_nets *net = NULL;
 4336         int nonce_sum_flag, ecn_seg_sums = 0;
 4337         int done_once;
 4338         uint8_t reneged_all = 0;
 4339         uint8_t cmt_dac_flag;
 4340 
 4341         /*
 4342          * we take any chance we can to service our queues since we cannot
 4343          * get awoken when the socket is read from :<
 4344          */
 4345         /*
 4346          * Now perform the actual SACK handling: 1) Verify that it is not an
 4347          * old sack, if so discard. 2) If there is nothing left in the send
 4348          * queue (cum-ack is equal to last acked) then you have a duplicate
 4349          * too, update any rwnd change and verify no timers are running.
 4350          * then return. 3) Process any new consequtive data i.e. cum-ack
 4351          * moved process these first and note that it moved. 4) Process any
 4352          * sack blocks. 5) Drop any acked from the queue. 6) Check for any
 4353          * revoked blocks and mark. 7) Update the cwnd. 8) Nothing left,
 4354          * sync up flightsizes and things, stop all timers and also check
 4355          * for shutdown_pending state. If so then go ahead and send off the
 4356          * shutdown. If in shutdown recv, send off the shutdown-ack and
 4357          * start that timer, Ret. 9) Strike any non-acked things and do FR
 4358          * procedure if needed being sure to set the FR flag. 10) Do pr-sctp
 4359          * procedures. 11) Apply any FR penalties. 12) Assure we will SACK
 4360          * if in shutdown_recv state.
 4361          */
 4362         SCTP_TCB_LOCK_ASSERT(stcb);
 4363         sack = &ch->sack;
 4364         /* CMT DAC algo */
 4365         this_sack_lowest_newack = 0;
 4366         j = 0;
 4367         sack_length = (unsigned int)sack_len;
 4368         /* ECN Nonce */
 4369         SCTP_STAT_INCR(sctps_slowpath_sack);
 4370         nonce_sum_flag = ch->ch.chunk_flags & SCTP_SACK_NONCE_SUM;
 4371         cum_ack = last_tsn = ntohl(sack->cum_tsn_ack);
 4372 #ifdef SCTP_ASOCLOG_OF_TSNS
 4373         stcb->asoc.cumack_log[stcb->asoc.cumack_log_at] = cum_ack;
 4374         stcb->asoc.cumack_log_at++;
 4375         if (stcb->asoc.cumack_log_at > SCTP_TSN_LOG_SIZE) {
 4376                 stcb->asoc.cumack_log_at = 0;
 4377         }
 4378 #endif
 4379         num_seg = ntohs(sack->num_gap_ack_blks);
 4380         a_rwnd = rwnd;
 4381 
 4382         if (sctp_logging_level & SCTP_LOG_SACK_ARRIVALS_ENABLE) {
 4383                 sctp_misc_ints(SCTP_SACK_LOG_NORMAL, cum_ack,
 4384                     rwnd, stcb->asoc.last_acked_seq, stcb->asoc.peers_rwnd);
 4385         }
 4386         /* CMT DAC algo */
 4387         cmt_dac_flag = ch->ch.chunk_flags & SCTP_SACK_CMT_DAC;
 4388         num_dup = ntohs(sack->num_dup_tsns);
 4389 
 4390         old_rwnd = stcb->asoc.peers_rwnd;
 4391         if (sctp_logging_level & SCTP_THRESHOLD_LOGGING) {
 4392                 sctp_misc_ints(SCTP_THRESHOLD_CLEAR,
 4393                     stcb->asoc.overall_error_count,
 4394                     0,
 4395                     SCTP_FROM_SCTP_INDATA,
 4396                     __LINE__);
 4397         }
 4398         stcb->asoc.overall_error_count = 0;
 4399         asoc = &stcb->asoc;
 4400         if (sctp_logging_level & SCTP_SACK_LOGGING_ENABLE) {
 4401                 sctp_log_sack(asoc->last_acked_seq,
 4402                     cum_ack,
 4403                     0,
 4404                     num_seg,
 4405                     num_dup,
 4406                     SCTP_LOG_NEW_SACK);
 4407         }
 4408         if ((num_dup) && (sctp_logging_level & (SCTP_FR_LOGGING_ENABLE | SCTP_EARLYFR_LOGGING_ENABLE))) {
 4409                 int off_to_dup, iii;
 4410                 uint32_t *dupdata, dblock;
 4411 
 4412                 off_to_dup = (num_seg * sizeof(struct sctp_gap_ack_block)) + sizeof(struct sctp_sack_chunk);
 4413                 if ((off_to_dup + (num_dup * sizeof(uint32_t))) <= sack_length) {
 4414                         dupdata = (uint32_t *) sctp_m_getptr(m, off_to_dup,
 4415                             sizeof(uint32_t), (uint8_t *) & dblock);
 4416                         off_to_dup += sizeof(uint32_t);
 4417                         if (dupdata) {
 4418                                 for (iii = 0; iii < num_dup; iii++) {
 4419                                         sctp_log_fr(*dupdata, 0, 0, SCTP_FR_DUPED);
 4420                                         dupdata = (uint32_t *) sctp_m_getptr(m, off_to_dup,
 4421                                             sizeof(uint32_t), (uint8_t *) & dblock);
 4422                                         if (dupdata == NULL)
 4423                                                 break;
 4424                                         off_to_dup += sizeof(uint32_t);
 4425                                 }
 4426                         }
 4427                 } else {
 4428                         SCTP_PRINTF("Size invalid offset to dups:%d number dups:%d sack_len:%d num gaps:%d\n",
 4429                             off_to_dup, num_dup, sack_length, num_seg);
 4430                 }
 4431         }
 4432         if (sctp_strict_sacks) {
 4433                 /* reality check */
 4434                 if (!TAILQ_EMPTY(&asoc->sent_queue)) {
 4435                         tp1 = TAILQ_LAST(&asoc->sent_queue,
 4436                             sctpchunk_listhead);
 4437                         send_s = tp1->rec.data.TSN_seq + 1;
 4438                 } else {
 4439                         send_s = asoc->sending_seq;
 4440                 }
 4441                 if (cum_ack == send_s ||
 4442                     compare_with_wrap(cum_ack, send_s, MAX_TSN)) {
 4443 #ifndef INVARIANTS
 4444                         struct mbuf *oper;
 4445 
 4446 #endif
 4447 #ifdef INVARIANTS
 4448         hopeless_peer:
 4449                         panic("Impossible sack 1");
 4450 #else
 4451 
 4452 
 4453                         /*
 4454                          * no way, we have not even sent this TSN out yet.
 4455                          * Peer is hopelessly messed up with us.
 4456                          */
 4457         hopeless_peer:
 4458                         *abort_now = 1;
 4459                         /* XXX */
 4460                         oper = sctp_get_mbuf_for_msg((sizeof(struct sctp_paramhdr) + sizeof(uint32_t)),
 4461                             0, M_DONTWAIT, 1, MT_DATA);
 4462                         if (oper) {
 4463                                 struct sctp_paramhdr *ph;
 4464                                 uint32_t *ippp;
 4465 
 4466                                 SCTP_BUF_LEN(oper) = sizeof(struct sctp_paramhdr) +
 4467                                     sizeof(uint32_t);
 4468                                 ph = mtod(oper, struct sctp_paramhdr *);
 4469                                 ph->param_type = htons(SCTP_CAUSE_PROTOCOL_VIOLATION);
 4470                                 ph->param_length = htons(SCTP_BUF_LEN(oper));
 4471                                 ippp = (uint32_t *) (ph + 1);
 4472                                 *ippp = htonl(SCTP_FROM_SCTP_INDATA + SCTP_LOC_25);
 4473                         }
 4474                         stcb->sctp_ep->last_abort_code = SCTP_FROM_SCTP_INDATA + SCTP_LOC_25;
 4475                         sctp_abort_an_association(stcb->sctp_ep, stcb, SCTP_PEER_FAULTY, oper, SCTP_SO_NOT_LOCKED);
 4476                         return;
 4477 #endif
 4478                 }
 4479         }
 4480         /**********************/
 4481         /* 1) check the range */
 4482         /**********************/
 4483         if (compare_with_wrap(asoc->last_acked_seq, last_tsn, MAX_TSN)) {
 4484                 /* acking something behind */
 4485                 return;
 4486         }
 4487         sav_cum_ack = asoc->last_acked_seq;
 4488 
 4489         /* update the Rwnd of the peer */
 4490         if (TAILQ_EMPTY(&asoc->sent_queue) &&
 4491             TAILQ_EMPTY(&asoc->send_queue) &&
 4492             (asoc->stream_queue_cnt == 0)
 4493             ) {
 4494                 /* nothing left on send/sent and strmq */
 4495                 if (sctp_logging_level & SCTP_LOG_RWND_ENABLE) {
 4496                         sctp_log_rwnd_set(SCTP_SET_PEER_RWND_VIA_SACK,
 4497                             asoc->peers_rwnd, 0, 0, a_rwnd);
 4498                 }
 4499                 asoc->peers_rwnd = a_rwnd;
 4500                 if (asoc->sent_queue_retran_cnt) {
 4501                         asoc->sent_queue_retran_cnt = 0;
 4502                 }
 4503                 if (asoc->peers_rwnd < stcb->sctp_ep->sctp_ep.sctp_sws_sender) {
 4504                         /* SWS sender side engages */
 4505                         asoc->peers_rwnd = 0;
 4506                 }
 4507                 /* stop any timers */
 4508                 TAILQ_FOREACH(net, &asoc->nets, sctp_next) {
 4509                         sctp_timer_stop(SCTP_TIMER_TYPE_SEND, stcb->sctp_ep,
 4510                             stcb, net, SCTP_FROM_SCTP_INDATA + SCTP_LOC_26);
 4511                         if (sctp_early_fr) {
 4512                                 if (SCTP_OS_TIMER_PENDING(&net->fr_timer.timer)) {
 4513                                         SCTP_STAT_INCR(sctps_earlyfrstpidsck1);
 4514                                         sctp_timer_stop(SCTP_TIMER_TYPE_EARLYFR, stcb->sctp_ep, stcb, net,
 4515                                             SCTP_FROM_SCTP_INDATA + SCTP_LOC_26);
 4516                                 }
 4517                         }
 4518                         net->partial_bytes_acked = 0;
 4519                         net->flight_size = 0;
 4520                 }
 4521                 asoc->total_flight = 0;
 4522                 asoc->total_flight_count = 0;
 4523                 return;
 4524         }
 4525         /*
 4526          * We init netAckSz and netAckSz2 to 0. These are used to track 2
 4527          * things. The total byte count acked is tracked in netAckSz AND
 4528          * netAck2 is used to track the total bytes acked that are un-
 4529          * amibguious and were never retransmitted. We track these on a per
 4530          * destination address basis.
 4531          */
 4532         TAILQ_FOREACH(net, &asoc->nets, sctp_next) {
 4533                 net->prev_cwnd = net->cwnd;
 4534                 net->net_ack = 0;
 4535                 net->net_ack2 = 0;
 4536 
 4537                 /*
 4538                  * CMT: Reset CUC and Fast recovery algo variables before
 4539                  * SACK processing
 4540                  */
 4541                 net->new_pseudo_cumack = 0;
 4542                 net->will_exit_fast_recovery = 0;
 4543         }
 4544         /* process the new consecutive TSN first */
 4545         tp1 = TAILQ_FIRST(&asoc->sent_queue);
 4546         while (tp1) {
 4547                 if (compare_with_wrap(last_tsn, tp1->rec.data.TSN_seq,
 4548                     MAX_TSN) ||
 4549                     last_tsn == tp1->rec.data.TSN_seq) {
 4550                         if (tp1->sent != SCTP_DATAGRAM_UNSENT) {
 4551                                 /*
 4552                                  * ECN Nonce: Add the nonce to the sender's
 4553                                  * nonce sum
 4554                                  */
 4555                                 asoc->nonce_sum_expect_base += tp1->rec.data.ect_nonce;
 4556                                 accum_moved = 1;
 4557                                 if (tp1->sent < SCTP_DATAGRAM_ACKED) {
 4558                                         /*
 4559                                          * If it is less than ACKED, it is
 4560                                          * now no-longer in flight. Higher
 4561                                          * values may occur during marking
 4562                                          */
 4563                                         if ((tp1->whoTo->dest_state &
 4564                                             SCTP_ADDR_UNCONFIRMED) &&
 4565                                             (tp1->snd_count < 2)) {
 4566                                                 /*
 4567                                                  * If there was no retran
 4568                                                  * and the address is
 4569                                                  * un-confirmed and we sent
 4570                                                  * there and are now
 4571                                                  * sacked.. its confirmed,
 4572                                                  * mark it so.
 4573                                                  */
 4574                                                 tp1->whoTo->dest_state &=
 4575                                                     ~SCTP_ADDR_UNCONFIRMED;
 4576                                         }
 4577                                         if (tp1->sent < SCTP_DATAGRAM_RESEND) {
 4578                                                 if (sctp_logging_level & SCTP_FLIGHT_LOGGING_ENABLE) {
 4579                                                         sctp_misc_ints(SCTP_FLIGHT_LOG_DOWN_CA,
 4580                                                             tp1->whoTo->flight_size,
 4581                                                             tp1->book_size,
 4582                                                             (uintptr_t) tp1->whoTo,
 4583                                                             tp1->rec.data.TSN_seq);
 4584                                                 }
 4585                                                 sctp_flight_size_decrease(tp1);
 4586                                                 sctp_total_flight_decrease(stcb, tp1);
 4587                                         }
 4588                                         tp1->whoTo->net_ack += tp1->send_size;
 4589 
 4590                                         /* CMT SFR and DAC algos */
 4591                                         this_sack_lowest_newack = tp1->rec.data.TSN_seq;
 4592                                         tp1->whoTo->saw_newack = 1;
 4593 
 4594                                         if (tp1->snd_count < 2) {
 4595                                                 /*
 4596                                                  * True non-retransmited
 4597                                                  * chunk
 4598                                                  */
 4599                                                 tp1->whoTo->net_ack2 +=
 4600                                                     tp1->send_size;
 4601 
 4602                                                 /* update RTO too? */
 4603                                                 if (tp1->do_rtt) {
 4604                                                         tp1->whoTo->RTO =
 4605                                                             sctp_calculate_rto(stcb,
 4606                                                             asoc, tp1->whoTo,
 4607                                                             &tp1->sent_rcv_time,
 4608                                                             sctp_align_safe_nocopy);
 4609                                                         tp1->do_rtt = 0;
 4610                                                 }
 4611                                         }
 4612                                         /*
 4613                                          * CMT: CUCv2 algorithm. From the
 4614                                          * cumack'd TSNs, for each TSN being
 4615                                          * acked for the first time, set the
 4616                                          * following variables for the
 4617                                          * corresp destination.
 4618                                          * new_pseudo_cumack will trigger a
 4619                                          * cwnd update.
 4620                                          * find_(rtx_)pseudo_cumack will
 4621                                          * trigger search for the next
 4622                                          * expected (rtx-)pseudo-cumack.
 4623                                          */
 4624                                         tp1->whoTo->new_pseudo_cumack = 1;
 4625                                         tp1->whoTo->find_pseudo_cumack = 1;
 4626                                         tp1->whoTo->find_rtx_pseudo_cumack = 1;
 4627 
 4628 
 4629                                         if (sctp_logging_level & SCTP_SACK_LOGGING_ENABLE) {
 4630                                                 sctp_log_sack(asoc->last_acked_seq,
 4631                                                     cum_ack,
 4632                                                     tp1->rec.data.TSN_seq,
 4633                                                     0,
 4634                                                     0,
 4635                                                     SCTP_LOG_TSN_ACKED);
 4636                                         }
 4637                                         if (sctp_logging_level & SCTP_CWND_LOGGING_ENABLE) {
 4638                                                 sctp_log_cwnd(stcb, tp1->whoTo, tp1->rec.data.TSN_seq, SCTP_CWND_LOG_FROM_SACK);
 4639                                         }
 4640                                 }
 4641                                 if (tp1->sent == SCTP_DATAGRAM_RESEND) {
 4642                                         sctp_ucount_decr(asoc->sent_queue_retran_cnt);
 4643 #ifdef SCTP_AUDITING_ENABLED
 4644                                         sctp_audit_log(0xB3,
 4645                                             (asoc->sent_queue_retran_cnt & 0x000000ff));
 4646 #endif
 4647                                 }
 4648                                 if (tp1->rec.data.chunk_was_revoked) {
 4649                                         /* deflate the cwnd */
 4650                                         tp1->whoTo->cwnd -= tp1->book_size;
 4651                                         tp1->rec.data.chunk_was_revoked = 0;
 4652                                 }
 4653                                 tp1->sent = SCTP_DATAGRAM_ACKED;
 4654                         }
 4655                 } else {
 4656                         break;
 4657                 }
 4658                 tp1 = TAILQ_NEXT(tp1, sctp_next);
 4659         }
 4660         biggest_tsn_newly_acked = biggest_tsn_acked = last_tsn;
 4661         /* always set this up to cum-ack */
 4662         asoc->this_sack_highest_gap = last_tsn;
 4663 
 4664         /* Move offset up to point to gaps/dups */
 4665         offset += sizeof(struct sctp_sack_chunk);
 4666         if (((num_seg * (sizeof(struct sctp_gap_ack_block))) + sizeof(struct sctp_sack_chunk)) > sack_length) {
 4667 
 4668                 /* skip corrupt segments */
 4669                 goto skip_segments;
 4670         }
 4671         if (num_seg > 0) {
 4672 
 4673                 /*
 4674                  * CMT: SFR algo (and HTNA) - this_sack_highest_newack has
 4675                  * to be greater than the cumack. Also reset saw_newack to 0
 4676                  * for all dests.
 4677                  */
 4678                 TAILQ_FOREACH(net, &asoc->nets, sctp_next) {
 4679                         net->saw_newack = 0;
 4680                         net->this_sack_highest_newack = last_tsn;
 4681                 }
 4682 
 4683                 /*
 4684                  * thisSackHighestGap will increase while handling NEW
 4685                  * segments this_sack_highest_newack will increase while
 4686                  * handling NEWLY ACKED chunks. this_sack_lowest_newack is
 4687                  * used for CMT DAC algo. saw_newack will also change.
 4688                  */
 4689                 sctp_handle_segments(m, &offset, stcb, asoc, ch, last_tsn,
 4690                     &biggest_tsn_acked, &biggest_tsn_newly_acked, &this_sack_lowest_newack,
 4691                     num_seg, &ecn_seg_sums);
 4692 
 4693                 if (sctp_strict_sacks) {
 4694                         /*
 4695                          * validate the biggest_tsn_acked in the gap acks if
 4696                          * strict adherence is wanted.
 4697                          */
 4698                         if ((biggest_tsn_acked == send_s) ||
 4699                             (compare_with_wrap(biggest_tsn_acked, send_s, MAX_TSN))) {
 4700                                 /*
 4701                                  * peer is either confused or we are under
 4702                                  * attack. We must abort.
 4703                                  */
 4704                                 goto hopeless_peer;
 4705                         }
 4706                 }
 4707         }
 4708 skip_segments:
 4709         /*******************************************/
 4710         /* cancel ALL T3-send timer if accum moved */
 4711         /*******************************************/
 4712         if (sctp_cmt_on_off) {
 4713                 TAILQ_FOREACH(net, &asoc->nets, sctp_next) {
 4714                         if (net->new_pseudo_cumack)
 4715                                 sctp_timer_stop(SCTP_TIMER_TYPE_SEND, stcb->sctp_ep,
 4716                                     stcb, net,
 4717                                     SCTP_FROM_SCTP_INDATA + SCTP_LOC_27);
 4718 
 4719                 }
 4720         } else {
 4721                 if (accum_moved) {
 4722                         TAILQ_FOREACH(net, &asoc->nets, sctp_next) {
 4723                                 sctp_timer_stop(SCTP_TIMER_TYPE_SEND, stcb->sctp_ep,
 4724                                     stcb, net, SCTP_FROM_SCTP_INDATA + SCTP_LOC_28);
 4725                         }
 4726                 }
 4727         }
 4728         /********************************************/
 4729         /* drop the acked chunks from the sendqueue */
 4730         /********************************************/
 4731         asoc->last_acked_seq = cum_ack;
 4732 
 4733         tp1 = TAILQ_FIRST(&asoc->sent_queue);
 4734         if (tp1 == NULL)
 4735                 goto done_with_it;
 4736         do {
 4737                 if (compare_with_wrap(tp1->rec.data.TSN_seq, cum_ack,
 4738                     MAX_TSN)) {
 4739                         break;
 4740                 }
 4741                 if (tp1->sent == SCTP_DATAGRAM_UNSENT) {
 4742                         /* no more sent on list */
 4743                         printf("Warning, tp1->sent == %d and its now acked?\n",
 4744                             tp1->sent);
 4745                 }
 4746                 tp2 = TAILQ_NEXT(tp1, sctp_next);
 4747                 TAILQ_REMOVE(&asoc->sent_queue, tp1, sctp_next);
 4748                 if (tp1->pr_sctp_on) {
 4749                         if (asoc->pr_sctp_cnt != 0)
 4750                                 asoc->pr_sctp_cnt--;
 4751                 }
 4752                 if ((TAILQ_FIRST(&asoc->sent_queue) == NULL) &&
 4753                     (asoc->total_flight > 0)) {
 4754 #ifdef INVARIANTS
 4755                         panic("Warning flight size is postive and should be 0");
 4756 #else
 4757                         SCTP_PRINTF("Warning flight size incorrect should be 0 is %d\n",
 4758                             asoc->total_flight);
 4759 #endif
 4760                         asoc->total_flight = 0;
 4761                 }
 4762                 if (tp1->data) {
 4763                         /* sa_ignore NO_NULL_CHK */
 4764                         sctp_free_bufspace(stcb, asoc, tp1, 1);
 4765                         sctp_m_freem(tp1->data);
 4766                         if (PR_SCTP_BUF_ENABLED(tp1->flags)) {
 4767                                 asoc->sent_queue_cnt_removeable--;
 4768                         }
 4769                 }
 4770                 if (sctp_logging_level & SCTP_SACK_LOGGING_ENABLE) {
 4771                         sctp_log_sack(asoc->last_acked_seq,
 4772                             cum_ack,
 4773                             tp1->rec.data.TSN_seq,
 4774                             0,
 4775                             0,
 4776                             SCTP_LOG_FREE_SENT);
 4777                 }
 4778                 tp1->data = NULL;
 4779                 asoc->sent_queue_cnt--;
 4780                 sctp_free_a_chunk(stcb, tp1);
 4781                 wake_him++;
 4782                 tp1 = tp2;
 4783         } while (tp1 != NULL);
 4784 
 4785 done_with_it:
 4786         /* sa_ignore NO_NULL_CHK */
 4787         if ((wake_him) && (stcb->sctp_socket)) {
 4788 #if defined (__APPLE__) || defined(SCTP_SO_LOCK_TESTING)
 4789                 struct socket *so;
 4790 
 4791 #endif
 4792                 SOCKBUF_LOCK(&stcb->sctp_socket->so_snd);
 4793                 if (sctp_logging_level & SCTP_WAKE_LOGGING_ENABLE) {
 4794                         sctp_wakeup_log(stcb, cum_ack, wake_him, SCTP_WAKESND_FROM_SACK);
 4795                 }
 4796 #if defined (__APPLE__) || defined(SCTP_SO_LOCK_TESTING)
 4797                 so = SCTP_INP_SO(stcb->sctp_ep);
 4798                 atomic_add_int(&stcb->asoc.refcnt, 1);
 4799                 SCTP_TCB_UNLOCK(stcb);
 4800                 SCTP_SOCKET_LOCK(so, 1);
 4801                 SCTP_TCB_LOCK(stcb);
 4802                 atomic_subtract_int(&stcb->asoc.refcnt, 1);
 4803                 if (stcb->asoc.state & SCTP_STATE_CLOSED_SOCKET) {
 4804                         /* assoc was freed while we were unlocked */
 4805                         SCTP_SOCKET_UNLOCK(so, 1);
 4806                         return;
 4807                 }
 4808 #endif
 4809                 sctp_sowwakeup_locked(stcb->sctp_ep, stcb->sctp_socket);
 4810 #if defined (__APPLE__) || defined(SCTP_SO_LOCK_TESTING)
 4811                 SCTP_SOCKET_UNLOCK(so, 1);
 4812 #endif
 4813         } else {
 4814                 if (sctp_logging_level & SCTP_WAKE_LOGGING_ENABLE) {
 4815                         sctp_wakeup_log(stcb, cum_ack, wake_him, SCTP_NOWAKE_FROM_SACK);
 4816                 }
 4817         }
 4818 
 4819         if (asoc->fast_retran_loss_recovery && accum_moved) {
 4820                 if (compare_with_wrap(asoc->last_acked_seq,
 4821                     asoc->fast_recovery_tsn, MAX_TSN) ||
 4822                     asoc->last_acked_seq == asoc->fast_recovery_tsn) {
 4823                         /* Setup so we will exit RFC2582 fast recovery */
 4824                         will_exit_fast_recovery = 1;
 4825                 }
 4826         }
 4827         /*
 4828          * Check for revoked fragments:
 4829          * 
 4830          * if Previous sack - Had no frags then we can't have any revoked if
 4831          * Previous sack - Had frag's then - If we now have frags aka
 4832          * num_seg > 0 call sctp_check_for_revoked() to tell if peer revoked
 4833          * some of them. else - The peer revoked all ACKED fragments, since
 4834          * we had some before and now we have NONE.
 4835          */
 4836 
 4837         if (num_seg)
 4838                 sctp_check_for_revoked(stcb, asoc, cum_ack, biggest_tsn_acked);
 4839         else if (asoc->saw_sack_with_frags) {
 4840                 int cnt_revoked = 0;
 4841 
 4842                 tp1 = TAILQ_FIRST(&asoc->sent_queue);
 4843                 if (tp1 != NULL) {
 4844                         /* Peer revoked all dg's marked or acked */
 4845                         TAILQ_FOREACH(tp1, &asoc->sent_queue, sctp_next) {
 4846                                 if ((tp1->sent > SCTP_DATAGRAM_RESEND) &&
 4847                                     (tp1->sent < SCTP_FORWARD_TSN_SKIP)) {
 4848                                         tp1->sent = SCTP_DATAGRAM_SENT;
 4849                                         if (sctp_logging_level & SCTP_FLIGHT_LOGGING_ENABLE) {
 4850                                                 sctp_misc_ints(SCTP_FLIGHT_LOG_UP_REVOKE,
 4851                                                     tp1->whoTo->flight_size,
 4852                                                     tp1->book_size,
 4853                                                     (uintptr_t) tp1->whoTo,
 4854                                                     tp1->rec.data.TSN_seq);
 4855                                         }
 4856                                         sctp_flight_size_increase(tp1);
 4857                                         sctp_total_flight_increase(stcb, tp1);
 4858                                         tp1->rec.data.chunk_was_revoked = 1;
 4859                                         /*
 4860                                          * To ensure that this increase in
 4861                                          * flightsize, which is artificial,
 4862                                          * does not throttle the sender, we
 4863                                          * also increase the cwnd
 4864                                          * artificially.
 4865                                          */
 4866                                         tp1->whoTo->cwnd += tp1->book_size;
 4867                                         cnt_revoked++;
 4868                                 }
 4869                         }
 4870                         if (cnt_revoked) {
 4871                                 reneged_all = 1;
 4872                         }
 4873                 }
 4874                 asoc->saw_sack_with_frags = 0;
 4875         }
 4876         if (num_seg)
 4877                 asoc->saw_sack_with_frags = 1;
 4878         else
 4879                 asoc->saw_sack_with_frags = 0;
 4880 
 4881         /* JRS - Use the congestion control given in the CC module */
 4882         asoc->cc_functions.sctp_cwnd_update_after_sack(stcb, asoc, accum_moved, reneged_all, will_exit_fast_recovery);
 4883 
 4884         if (TAILQ_EMPTY(&asoc->sent_queue)) {
 4885                 /* nothing left in-flight */
 4886                 TAILQ_FOREACH(net, &asoc->nets, sctp_next) {
 4887                         /* stop all timers */
 4888                         if (sctp_early_fr) {
 4889                                 if (SCTP_OS_TIMER_PENDING(&net->fr_timer.timer)) {
 4890                                         SCTP_STAT_INCR(sctps_earlyfrstpidsck4);
 4891                                         sctp_timer_stop(SCTP_TIMER_TYPE_EARLYFR, stcb->sctp_ep, stcb, net,
 4892                                             SCTP_FROM_SCTP_INDATA + SCTP_LOC_29);
 4893                                 }
 4894                         }
 4895                         sctp_timer_stop(SCTP_TIMER_TYPE_SEND, stcb->sctp_ep,
 4896                             stcb, net, SCTP_FROM_SCTP_INDATA + SCTP_LOC_30);
 4897                         net->flight_size = 0;
 4898                         net->partial_bytes_acked = 0;
 4899                 }
 4900                 asoc->total_flight = 0;
 4901                 asoc->total_flight_count = 0;
 4902         }
 4903         /**********************************/
 4904         /* Now what about shutdown issues */
 4905         /**********************************/
 4906         if (TAILQ_EMPTY(&asoc->send_queue) && TAILQ_EMPTY(&asoc->sent_queue)) {
 4907                 /* nothing left on sendqueue.. consider done */
 4908                 if (sctp_logging_level & SCTP_LOG_RWND_ENABLE) {
 4909                         sctp_log_rwnd_set(SCTP_SET_PEER_RWND_VIA_SACK,
 4910                             asoc->peers_rwnd, 0, 0, a_rwnd);
 4911                 }
 4912                 asoc->peers_rwnd = a_rwnd;
 4913                 if (asoc->peers_rwnd < stcb->sctp_ep->sctp_ep.sctp_sws_sender) {
 4914                         /* SWS sender side engages */
 4915                         asoc->peers_rwnd = 0;
 4916                 }
 4917                 /* clean up */
 4918                 if ((asoc->stream_queue_cnt == 1) &&
 4919                     ((asoc->state & SCTP_STATE_SHUTDOWN_PENDING) ||
 4920                     (asoc->state & SCTP_STATE_SHUTDOWN_RECEIVED)) &&
 4921                     (asoc->locked_on_sending)
 4922                     ) {
 4923                         struct sctp_stream_queue_pending *sp;
 4924 
 4925                         /*
 4926                          * I may be in a state where we got all across.. but
 4927                          * cannot write more due to a shutdown... we abort
 4928                          * since the user did not indicate EOR in this case.
 4929                          */
 4930                         sp = TAILQ_LAST(&((asoc->locked_on_sending)->outqueue),
 4931                             sctp_streamhead);
 4932                         if ((sp) && (sp->length == 0)) {
 4933                                 asoc->locked_on_sending = NULL;
 4934                                 if (sp->msg_is_complete) {
 4935                                         asoc->stream_queue_cnt--;
 4936                                 } else {
 4937                                         asoc->state |= SCTP_STATE_PARTIAL_MSG_LEFT;
 4938                                         asoc->stream_queue_cnt--;
 4939                                 }
 4940                         }
 4941                 }
 4942                 if ((asoc->state & SCTP_STATE_SHUTDOWN_PENDING) &&
 4943                     (asoc->stream_queue_cnt == 0)) {
 4944                         if (asoc->state & SCTP_STATE_PARTIAL_MSG_LEFT) {
 4945                                 /* Need to abort here */
 4946                                 struct mbuf *oper;
 4947 
 4948                 abort_out_now:
 4949                                 *abort_now = 1;
 4950                                 /* XXX */
 4951                                 oper = sctp_get_mbuf_for_msg((sizeof(struct sctp_paramhdr) + sizeof(uint32_t)),
 4952                                     0, M_DONTWAIT, 1, MT_DATA);
 4953                                 if (oper) {
 4954                                         struct sctp_paramhdr *ph;
 4955                                         uint32_t *ippp;
 4956 
 4957                                         SCTP_BUF_LEN(oper) = sizeof(struct sctp_paramhdr) +
 4958                                             sizeof(uint32_t);
 4959                                         ph = mtod(oper, struct sctp_paramhdr *);
 4960                                         ph->param_type = htons(SCTP_CAUSE_USER_INITIATED_ABT);
 4961                                         ph->param_length = htons(SCTP_BUF_LEN(oper));
 4962                                         ippp = (uint32_t *) (ph + 1);
 4963                                         *ippp = htonl(SCTP_FROM_SCTP_INDATA + SCTP_LOC_31);
 4964                                 }
 4965                                 stcb->sctp_ep->last_abort_code = SCTP_FROM_SCTP_INDATA + SCTP_LOC_31;
 4966                                 sctp_abort_an_association(stcb->sctp_ep, stcb, SCTP_RESPONSE_TO_USER_REQ, oper, SCTP_SO_NOT_LOCKED);
 4967                                 return;
 4968                         } else {
 4969                                 if ((SCTP_GET_STATE(asoc) == SCTP_STATE_OPEN) ||
 4970                                     (SCTP_GET_STATE(asoc) == SCTP_STATE_SHUTDOWN_RECEIVED)) {
 4971                                         SCTP_STAT_DECR_GAUGE32(sctps_currestab);
 4972                                 }
 4973                                 SCTP_SET_STATE(asoc, SCTP_STATE_SHUTDOWN_SENT);
 4974                                 SCTP_CLEAR_SUBSTATE(asoc, SCTP_STATE_SHUTDOWN_PENDING);
 4975                                 sctp_stop_timers_for_shutdown(stcb);
 4976                                 sctp_send_shutdown(stcb,
 4977                                     stcb->asoc.primary_destination);
 4978                                 sctp_timer_start(SCTP_TIMER_TYPE_SHUTDOWN,
 4979                                     stcb->sctp_ep, stcb, asoc->primary_destination);
 4980                                 sctp_timer_start(SCTP_TIMER_TYPE_SHUTDOWNGUARD,
 4981                                     stcb->sctp_ep, stcb, asoc->primary_destination);
 4982                         }
 4983                         return;
 4984                 } else if ((SCTP_GET_STATE(asoc) == SCTP_STATE_SHUTDOWN_RECEIVED) &&
 4985                     (asoc->stream_queue_cnt == 0)) {
 4986                         if (asoc->state & SCTP_STATE_PARTIAL_MSG_LEFT) {
 4987                                 goto abort_out_now;
 4988                         }
 4989                         SCTP_STAT_DECR_GAUGE32(sctps_currestab);
 4990                         SCTP_SET_STATE(asoc, SCTP_STATE_SHUTDOWN_ACK_SENT);
 4991                         SCTP_CLEAR_SUBSTATE(asoc, SCTP_STATE_SHUTDOWN_PENDING);
 4992                         sctp_send_shutdown_ack(stcb,
 4993                             stcb->asoc.primary_destination);
 4994 
 4995                         sctp_timer_start(SCTP_TIMER_TYPE_SHUTDOWNACK,
 4996                             stcb->sctp_ep, stcb, asoc->primary_destination);
 4997                         return;
 4998                 }
 4999         }
 5000         /*
 5001          * Now here we are going to recycle net_ack for a different use...
 5002          * HEADS UP.
 5003          */
 5004         TAILQ_FOREACH(net, &asoc->nets, sctp_next) {
 5005                 net->net_ack = 0;
 5006         }
 5007 
 5008         /*
 5009          * CMT DAC algorithm: If SACK DAC flag was 0, then no extra marking
 5010          * to be done. Setting this_sack_lowest_newack to the cum_ack will
 5011          * automatically ensure that.
 5012          */
 5013         if (sctp_cmt_on_off && sctp_cmt_use_dac && (cmt_dac_flag == 0)) {
 5014                 this_sack_lowest_newack = cum_ack;
 5015         }
 5016         if (num_seg > 0) {
 5017                 sctp_strike_gap_ack_chunks(stcb, asoc, biggest_tsn_acked,
 5018                     biggest_tsn_newly_acked, this_sack_lowest_newack, accum_moved);
 5019         }
 5020         /*********************************************/
 5021         /* Here we perform PR-SCTP procedures        */
 5022         /* (section 4.2)                             */
 5023         /*********************************************/
 5024         /* C1. update advancedPeerAckPoint */
 5025         if (compare_with_wrap(cum_ack, asoc->advanced_peer_ack_point, MAX_TSN)) {
 5026                 asoc->advanced_peer_ack_point = cum_ack;
 5027         }
 5028         /* C2. try to further move advancedPeerAckPoint ahead */
 5029         if ((asoc->peer_supports_prsctp) && (asoc->pr_sctp_cnt > 0)) {
 5030                 struct sctp_tmit_chunk *lchk;
 5031 
 5032                 lchk = sctp_try_advance_peer_ack_point(stcb, asoc);
 5033                 /* C3. See if we need to send a Fwd-TSN */
 5034                 if (compare_with_wrap(asoc->advanced_peer_ack_point, cum_ack,
 5035                     MAX_TSN)) {
 5036                         /*
 5037                          * ISSUE with ECN, see FWD-TSN processing for notes
 5038                          * on issues that will occur when the ECN NONCE
 5039                          * stuff is put into SCTP for cross checking.
 5040                          */
 5041                         send_forward_tsn(stcb, asoc);
 5042 
 5043                         /*
 5044                          * ECN Nonce: Disable Nonce Sum check when FWD TSN
 5045                          * is sent and store resync tsn
 5046                          */
 5047                         asoc->nonce_sum_check = 0;
 5048                         asoc->nonce_resync_tsn = asoc->advanced_peer_ack_point;
 5049                         if (lchk) {
 5050                                 /* Assure a timer is up */
 5051                                 sctp_timer_start(SCTP_TIMER_TYPE_SEND,
 5052                                     stcb->sctp_ep, stcb, lchk->whoTo);
 5053                         }
 5054                 }
 5055         }
 5056         /* JRS - Use the congestion control given in the CC module */
 5057         asoc->cc_functions.sctp_cwnd_update_after_fr(stcb, asoc);
 5058 
 5059         /******************************************************************
 5060          *  Here we do the stuff with ECN Nonce checking.
 5061          *  We basically check to see if the nonce sum flag was incorrect
 5062          *  or if resynchronization needs to be done. Also if we catch a
 5063          *  misbehaving receiver we give him the kick.
 5064          ******************************************************************/
 5065 
 5066         if (asoc->ecn_nonce_allowed) {
 5067                 if (asoc->nonce_sum_check) {
 5068                         if (nonce_sum_flag != ((asoc->nonce_sum_expect_base + ecn_seg_sums) & SCTP_SACK_NONCE_SUM)) {
 5069                                 if (asoc->nonce_wait_for_ecne == 0) {
 5070                                         struct sctp_tmit_chunk *lchk;
 5071 
 5072                                         lchk = TAILQ_FIRST(&asoc->send_queue);
 5073                                         asoc->nonce_wait_for_ecne = 1;
 5074                                         if (lchk) {
 5075                                                 asoc->nonce_wait_tsn = lchk->rec.data.TSN_seq;
 5076                                         } else {
 5077                                                 asoc->nonce_wait_tsn = asoc->sending_seq;
 5078                                         }
 5079                                 } else {
 5080                                         if (compare_with_wrap(asoc->last_acked_seq, asoc->nonce_wait_tsn, MAX_TSN) ||
 5081                                             (asoc->last_acked_seq == asoc->nonce_wait_tsn)) {
 5082                                                 /*
 5083                                                  * Misbehaving peer. We need
 5084                                                  * to react to this guy
 5085                                                  */
 5086                                                 asoc->ecn_allowed = 0;
 5087                                                 asoc->ecn_nonce_allowed = 0;
 5088                                         }
 5089                                 }
 5090                         }
 5091                 } else {
 5092                         /* See if Resynchronization Possible */
 5093                         if (compare_with_wrap(asoc->last_acked_seq, asoc->nonce_resync_tsn, MAX_TSN)) {
 5094                                 asoc->nonce_sum_check = 1;
 5095                                 /*
 5096                                  * now we must calculate what the base is.
 5097                                  * We do this based on two things, we know
 5098                                  * the total's for all the segments
 5099                                  * gap-acked in the SACK, its stored in
 5100                                  * ecn_seg_sums. We also know the SACK's
 5101                                  * nonce sum, its in nonce_sum_flag. So we
 5102                                  * can build a truth table to back-calculate
 5103                                  * the new value of
 5104                                  * asoc->nonce_sum_expect_base:
 5105                                  * 
 5106                                  * SACK-flag-Value         Seg-Sums Base 0 0 0
 5107                                  * 1                    0 1 0 1 1 1
 5108                                  * 1 0
 5109                                  */
 5110                                 asoc->nonce_sum_expect_base = (ecn_seg_sums ^ nonce_sum_flag) & SCTP_SACK_NONCE_SUM;
 5111                         }
 5112                 }
 5113         }
 5114         /* Now are we exiting loss recovery ? */
 5115         if (will_exit_fast_recovery) {
 5116                 /* Ok, we must exit fast recovery */
 5117                 asoc->fast_retran_loss_recovery = 0;
 5118         }
 5119         if ((asoc->sat_t3_loss_recovery) &&
 5120             ((compare_with_wrap(asoc->last_acked_seq, asoc->sat_t3_recovery_tsn,
 5121             MAX_TSN) ||
 5122             (asoc->last_acked_seq == asoc->sat_t3_recovery_tsn)))) {
 5123                 /* end satellite t3 loss recovery */
 5124                 asoc->sat_t3_loss_recovery = 0;
 5125         }
 5126         /*
 5127          * CMT Fast recovery
 5128          */
 5129         TAILQ_FOREACH(net, &asoc->nets, sctp_next) {
 5130                 if (net->will_exit_fast_recovery) {
 5131                         /* Ok, we must exit fast recovery */
 5132                         net->fast_retran_loss_recovery = 0;
 5133                 }
 5134         }
 5135 
 5136         /* Adjust and set the new rwnd value */
 5137         if (sctp_logging_level & SCTP_LOG_RWND_ENABLE) {
 5138                 sctp_log_rwnd_set(SCTP_SET_PEER_RWND_VIA_SACK,
 5139                     asoc->peers_rwnd, asoc->total_flight, (asoc->sent_queue_cnt * sctp_peer_chunk_oh), a_rwnd);
 5140         }
 5141         asoc->peers_rwnd = sctp_sbspace_sub(a_rwnd,
 5142             (uint32_t) (asoc->total_flight + (asoc->sent_queue_cnt * sctp_peer_chunk_oh)));
 5143         if (asoc->peers_rwnd < stcb->sctp_ep->sctp_ep.sctp_sws_sender) {
 5144                 /* SWS sender side engages */
 5145                 asoc->peers_rwnd = 0;
 5146         }
 5147         if (asoc->peers_rwnd > old_rwnd) {
 5148                 win_probe_recovery = 1;
 5149         }
 5150         /*
 5151          * Now we must setup so we have a timer up for anyone with
 5152          * outstanding data.
 5153          */
 5154         done_once = 0;
 5155 again:
 5156         j = 0;
 5157         TAILQ_FOREACH(net, &asoc->nets, sctp_next) {
 5158                 if (win_probe_recovery && (net->window_probe)) {
 5159                         net->window_probe = 0;
 5160                         win_probe_recovered = 1;
 5161                         /*-
 5162                          * Find first chunk that was used with
 5163                          * window probe and clear the event. Put
 5164                          * it back into the send queue as if has
 5165                          * not been sent.
 5166                          */
 5167                         TAILQ_FOREACH(tp1, &asoc->sent_queue, sctp_next) {
 5168                                 if (tp1->window_probe) {
 5169                                         sctp_window_probe_recovery(stcb, asoc, net, tp1);
 5170                                         break;
 5171                                 }
 5172                         }
 5173                 }
 5174                 if (net->flight_size) {
 5175                         j++;
 5176                         sctp_timer_start(SCTP_TIMER_TYPE_SEND,
 5177                             stcb->sctp_ep, stcb, net);
 5178                 } else {
 5179                         if (SCTP_OS_TIMER_PENDING(&net->rxt_timer.timer)) {
 5180                                 sctp_timer_stop(SCTP_TIMER_TYPE_SEND, stcb->sctp_ep,
 5181                                     stcb, net,
 5182                                     SCTP_FROM_SCTP_INDATA + SCTP_LOC_22);
 5183                         }
 5184                         if (sctp_early_fr) {
 5185                                 if (SCTP_OS_TIMER_PENDING(&net->fr_timer.timer)) {
 5186                                         SCTP_STAT_INCR(sctps_earlyfrstpidsck4);
 5187                                         sctp_timer_stop(SCTP_TIMER_TYPE_EARLYFR, stcb->sctp_ep, stcb, net,
 5188                                             SCTP_FROM_SCTP_INDATA + SCTP_LOC_23);
 5189                                 }
 5190                         }
 5191                 }
 5192         }
 5193         if ((j == 0) &&
 5194             (!TAILQ_EMPTY(&asoc->sent_queue)) &&
 5195             (asoc->sent_queue_retran_cnt == 0) &&
 5196             (win_probe_recovered == 0) &&
 5197             (done_once == 0)) {
 5198                 /* huh, this should not happen */
 5199                 sctp_fs_audit(asoc);
 5200                 TAILQ_FOREACH(net, &asoc->nets, sctp_next) {
 5201                         net->flight_size = 0;
 5202                 }
 5203                 asoc->total_flight = 0;
 5204                 asoc->total_flight_count = 0;
 5205                 asoc->sent_queue_retran_cnt = 0;
 5206                 TAILQ_FOREACH(tp1, &asoc->sent_queue, sctp_next) {
 5207                         if (tp1->sent < SCTP_DATAGRAM_RESEND) {
 5208                                 sctp_flight_size_increase(tp1);
 5209                                 sctp_total_flight_increase(stcb, tp1);
 5210                         } else if (tp1->sent == SCTP_DATAGRAM_RESEND) {
 5211                                 asoc->sent_queue_retran_cnt++;
 5212                         }
 5213                 }
 5214                 done_once = 1;
 5215                 goto again;
 5216         }
 5217         if (sctp_logging_level & SCTP_SACK_RWND_LOGGING_ENABLE) {
 5218                 sctp_misc_ints(SCTP_SACK_RWND_UPDATE,
 5219                     a_rwnd,
 5220                     stcb->asoc.peers_rwnd,
 5221                     stcb->asoc.total_flight,
 5222                     stcb->asoc.total_output_queue_size);
 5223         }
 5224 }
 5225 
 5226 void
 5227 sctp_update_acked(struct sctp_tcb *stcb, struct sctp_shutdown_chunk *cp,
 5228     struct sctp_nets *netp, int *abort_flag)
 5229 {
 5230         /* Copy cum-ack */
 5231         uint32_t cum_ack, a_rwnd;
 5232 
 5233         cum_ack = ntohl(cp->cumulative_tsn_ack);
 5234         /* Arrange so a_rwnd does NOT change */
 5235         a_rwnd = stcb->asoc.peers_rwnd + stcb->asoc.total_flight;
 5236 
 5237         /* Now call the express sack handling */
 5238         sctp_express_handle_sack(stcb, cum_ack, a_rwnd, 0, abort_flag);
 5239 }
 5240 
 5241 static void
 5242 sctp_kick_prsctp_reorder_queue(struct sctp_tcb *stcb,
 5243     struct sctp_stream_in *strmin)
 5244 {
 5245         struct sctp_queued_to_read *ctl, *nctl;
 5246         struct sctp_association *asoc;
 5247         int tt;
 5248 
 5249         asoc = &stcb->asoc;
 5250         tt = strmin->last_sequence_delivered;
 5251         /*
 5252          * First deliver anything prior to and including the stream no that
 5253          * came in
 5254          */
 5255         ctl = TAILQ_FIRST(&strmin->inqueue);
 5256         while (ctl) {
 5257                 nctl = TAILQ_NEXT(ctl, next);
 5258                 if (compare_with_wrap(tt, ctl->sinfo_ssn, MAX_SEQ) ||
 5259                     (tt == ctl->sinfo_ssn)) {
 5260                         /* this is deliverable now */
 5261                         TAILQ_REMOVE(&strmin->inqueue, ctl, next);
 5262                         /* subtract pending on streams */
 5263                         asoc->size_on_all_streams -= ctl->length;
 5264                         sctp_ucount_decr(asoc->cnt_on_all_streams);
 5265                         /* deliver it to at least the delivery-q */
 5266                         if (stcb->sctp_socket) {
 5267                                 sctp_add_to_readq(stcb->sctp_ep, stcb,
 5268                                     ctl,
 5269                                     &stcb->sctp_socket->so_rcv, 1, SCTP_SO_NOT_LOCKED);
 5270                         }
 5271                 } else {
 5272                         /* no more delivery now. */
 5273                         break;
 5274                 }
 5275                 ctl = nctl;
 5276         }
 5277         /*
 5278          * now we must deliver things in queue the normal way  if any are
 5279          * now ready.
 5280          */
 5281         tt = strmin->last_sequence_delivered + 1;
 5282         ctl = TAILQ_FIRST(&strmin->inqueue);
 5283         while (ctl) {
 5284                 nctl = TAILQ_NEXT(ctl, next);
 5285                 if (tt == ctl->sinfo_ssn) {
 5286                         /* this is deliverable now */
 5287                         TAILQ_REMOVE(&strmin->inqueue, ctl, next);
 5288                         /* subtract pending on streams */
 5289                         asoc->size_on_all_streams -= ctl->length;
 5290                         sctp_ucount_decr(asoc->cnt_on_all_streams);
 5291                         /* deliver it to at least the delivery-q */
 5292                         strmin->last_sequence_delivered = ctl->sinfo_ssn;
 5293                         if (stcb->sctp_socket) {
 5294                                 sctp_add_to_readq(stcb->sctp_ep, stcb,
 5295                                     ctl,
 5296                                     &stcb->sctp_socket->so_rcv, 1, SCTP_SO_NOT_LOCKED);
 5297                         }
 5298                         tt = strmin->last_sequence_delivered + 1;
 5299                 } else {
 5300                         break;
 5301                 }
 5302                 ctl = nctl;
 5303         }
 5304 }
 5305 
 5306 void
 5307 sctp_handle_forward_tsn(struct sctp_tcb *stcb,
 5308     struct sctp_forward_tsn_chunk *fwd, int *abort_flag, struct mbuf *m, int offset)
 5309 {
 5310         /*
 5311          * ISSUES that MUST be fixed for ECN! When we are the sender of the
 5312          * forward TSN, when the SACK comes back that acknowledges the
 5313          * FWD-TSN we must reset the NONCE sum to match correctly. This will
 5314          * get quite tricky since we may have sent more data interveneing
 5315          * and must carefully account for what the SACK says on the nonce
 5316          * and any gaps that are reported. This work will NOT be done here,
 5317          * but I note it here since it is really related to PR-SCTP and
 5318          * FWD-TSN's
 5319          */
 5320 
 5321         /* The pr-sctp fwd tsn */
 5322         /*
 5323          * here we will perform all the data receiver side steps for
 5324          * processing FwdTSN, as required in by pr-sctp draft:
 5325          * 
 5326          * Assume we get FwdTSN(x):
 5327          * 
 5328          * 1) update local cumTSN to x 2) try to further advance cumTSN to x +
 5329          * others we have 3) examine and update re-ordering queue on
 5330          * pr-in-streams 4) clean up re-assembly queue 5) Send a sack to
 5331          * report where we are.
 5332          */
 5333         struct sctp_association *asoc;
 5334         uint32_t new_cum_tsn, gap;
 5335         unsigned int i, cnt_gone, fwd_sz, cumack_set_flag, m_size;
 5336         struct sctp_stream_in *strm;
 5337         struct sctp_tmit_chunk *chk, *at;
 5338 
 5339         cumack_set_flag = 0;
 5340         asoc = &stcb->asoc;
 5341         cnt_gone = 0;
 5342         if ((fwd_sz = ntohs(fwd->ch.chunk_length)) < sizeof(struct sctp_forward_tsn_chunk)) {
 5343                 SCTPDBG(SCTP_DEBUG_INDATA1,
 5344                     "Bad size too small/big fwd-tsn\n");
 5345                 return;
 5346         }
 5347         m_size = (stcb->asoc.mapping_array_size << 3);
 5348         /*************************************************************/
 5349         /* 1. Here we update local cumTSN and shift the bitmap array */
 5350         /*************************************************************/
 5351         new_cum_tsn = ntohl(fwd->new_cumulative_tsn);
 5352 
 5353         if (compare_with_wrap(asoc->cumulative_tsn, new_cum_tsn, MAX_TSN) ||
 5354             asoc->cumulative_tsn == new_cum_tsn) {
 5355                 /* Already got there ... */
 5356                 return;
 5357         }
 5358         if (compare_with_wrap(new_cum_tsn, asoc->highest_tsn_inside_map,
 5359             MAX_TSN)) {
 5360                 asoc->highest_tsn_inside_map = new_cum_tsn;
 5361                 if (sctp_logging_level & SCTP_MAP_LOGGING_ENABLE) {
 5362                         sctp_log_map(0, 0, asoc->highest_tsn_inside_map, SCTP_MAP_SLIDE_RESULT);
 5363                 }
 5364         }
 5365         /*
 5366          * now we know the new TSN is more advanced, let's find the actual
 5367          * gap
 5368          */
 5369         if ((compare_with_wrap(new_cum_tsn, asoc->mapping_array_base_tsn,
 5370             MAX_TSN)) ||
 5371             (new_cum_tsn == asoc->mapping_array_base_tsn)) {
 5372                 gap = new_cum_tsn - asoc->mapping_array_base_tsn;
 5373         } else {
 5374                 /* try to prevent underflow here */
 5375                 gap = new_cum_tsn + (MAX_TSN - asoc->mapping_array_base_tsn) + 1;
 5376         }
 5377 
 5378         if (gap >= m_size) {
 5379                 if (sctp_logging_level & SCTP_MAP_LOGGING_ENABLE) {
 5380                         sctp_log_map(0, 0, asoc->highest_tsn_inside_map, SCTP_MAP_SLIDE_RESULT);
 5381                 }
 5382                 if ((long)gap > sctp_sbspace(&stcb->asoc, &stcb->sctp_socket->so_rcv)) {
 5383                         struct mbuf *oper;
 5384 
 5385                         /*
 5386                          * out of range (of single byte chunks in the rwnd I
 5387                          * give out). This must be an attacker.
 5388                          */
 5389                         *abort_flag = 1;
 5390                         oper = sctp_get_mbuf_for_msg((sizeof(struct sctp_paramhdr) + 3 * sizeof(uint32_t)),
 5391                             0, M_DONTWAIT, 1, MT_DATA);
 5392                         if (oper) {
 5393                                 struct sctp_paramhdr *ph;
 5394                                 uint32_t *ippp;
 5395 
 5396                                 SCTP_BUF_LEN(oper) = sizeof(struct sctp_paramhdr) +
 5397                                     (sizeof(uint32_t) * 3);
 5398                                 ph = mtod(oper, struct sctp_paramhdr *);
 5399                                 ph->param_type = htons(SCTP_CAUSE_PROTOCOL_VIOLATION);
 5400                                 ph->param_length = htons(SCTP_BUF_LEN(oper));
 5401                                 ippp = (uint32_t *) (ph + 1);
 5402                                 *ippp = htonl(SCTP_FROM_SCTP_INDATA + SCTP_LOC_33);
 5403                                 ippp++;
 5404                                 *ippp = asoc->highest_tsn_inside_map;
 5405                                 ippp++;
 5406                                 *ippp = new_cum_tsn;
 5407                         }
 5408                         stcb->sctp_ep->last_abort_code = SCTP_FROM_SCTP_INDATA + SCTP_LOC_33;
 5409                         sctp_abort_an_association(stcb->sctp_ep, stcb,
 5410                             SCTP_PEER_FAULTY, oper, SCTP_SO_NOT_LOCKED);
 5411                         return;
 5412                 }
 5413                 SCTP_STAT_INCR(sctps_fwdtsn_map_over);
 5414 slide_out:
 5415                 memset(stcb->asoc.mapping_array, 0, stcb->asoc.mapping_array_size);
 5416                 cumack_set_flag = 1;
 5417                 asoc->mapping_array_base_tsn = new_cum_tsn + 1;
 5418                 asoc->cumulative_tsn = asoc->highest_tsn_inside_map = new_cum_tsn;
 5419 
 5420                 if (sctp_logging_level & SCTP_MAP_LOGGING_ENABLE) {
 5421                         sctp_log_map(0, 3, asoc->highest_tsn_inside_map, SCTP_MAP_SLIDE_RESULT);
 5422                 }
 5423                 asoc->last_echo_tsn = asoc->highest_tsn_inside_map;
 5424         } else {
 5425                 SCTP_TCB_LOCK_ASSERT(stcb);
 5426                 if ((compare_with_wrap(((uint32_t) asoc->cumulative_tsn + gap), asoc->highest_tsn_inside_map, MAX_TSN)) ||
 5427                     (((uint32_t) asoc->cumulative_tsn + gap) == asoc->highest_tsn_inside_map)) {
 5428                         goto slide_out;
 5429                 } else {
 5430                         for (i = 0; i <= gap; i++) {
 5431                                 SCTP_SET_TSN_PRESENT(asoc->mapping_array, i);
 5432                         }
 5433                 }
 5434                 /*
 5435                  * Now after marking all, slide thing forward but no sack
 5436                  * please.
 5437                  */
 5438                 sctp_sack_check(stcb, 0, 0, abort_flag);
 5439                 if (*abort_flag)
 5440                         return;
 5441         }
 5442 
 5443         /*************************************************************/
 5444         /* 2. Clear up re-assembly queue                             */
 5445         /*************************************************************/
 5446         /*
 5447          * First service it if pd-api is up, just in case we can progress it
 5448          * forward
 5449          */
 5450         if (asoc->fragmented_delivery_inprogress) {
 5451                 sctp_service_reassembly(stcb, asoc);
 5452         }
 5453         if (!TAILQ_EMPTY(&asoc->reasmqueue)) {
 5454                 /* For each one on here see if we need to toss it */
 5455                 /*
 5456                  * For now large messages held on the reasmqueue that are
 5457                  * complete will be tossed too. We could in theory do more
 5458                  * work to spin through and stop after dumping one msg aka
 5459                  * seeing the start of a new msg at the head, and call the
 5460                  * delivery function... to see if it can be delivered... But
 5461                  * for now we just dump everything on the queue.
 5462                  */
 5463                 chk = TAILQ_FIRST(&asoc->reasmqueue);
 5464                 while (chk) {
 5465                         at = TAILQ_NEXT(chk, sctp_next);
 5466                         if (compare_with_wrap(asoc->cumulative_tsn,
 5467                             chk->rec.data.TSN_seq, MAX_TSN) ||
 5468                             asoc->cumulative_tsn == chk->rec.data.TSN_seq) {
 5469                                 /* It needs to be tossed */
 5470                                 TAILQ_REMOVE(&asoc->reasmqueue, chk, sctp_next);
 5471                                 if (compare_with_wrap(chk->rec.data.TSN_seq,
 5472                                     asoc->tsn_last_delivered, MAX_TSN)) {
 5473                                         asoc->tsn_last_delivered =
 5474                                             chk->rec.data.TSN_seq;
 5475                                         asoc->str_of_pdapi =
 5476                                             chk->rec.data.stream_number;
 5477                                         asoc->ssn_of_pdapi =
 5478                                             chk->rec.data.stream_seq;
 5479                                         asoc->fragment_flags =
 5480                                             chk->rec.data.rcv_flags;
 5481                                 }
 5482                                 asoc->size_on_reasm_queue -= chk->send_size;
 5483                                 sctp_ucount_decr(asoc->cnt_on_reasm_queue);
 5484                                 cnt_gone++;
 5485 
 5486                                 /* Clear up any stream problem */
 5487                                 if ((chk->rec.data.rcv_flags & SCTP_DATA_UNORDERED) !=
 5488                                     SCTP_DATA_UNORDERED &&
 5489                                     (compare_with_wrap(chk->rec.data.stream_seq,
 5490                                     asoc->strmin[chk->rec.data.stream_number].last_sequence_delivered,
 5491                                     MAX_SEQ))) {
 5492                                         /*
 5493                                          * We must dump forward this streams
 5494                                          * sequence number if the chunk is
 5495                                          * not unordered that is being
 5496                                          * skipped. There is a chance that
 5497                                          * if the peer does not include the
 5498                                          * last fragment in its FWD-TSN we
 5499                                          * WILL have a problem here since
 5500                                          * you would have a partial chunk in
 5501                                          * queue that may not be
 5502                                          * deliverable. Also if a Partial
 5503                                          * delivery API as started the user
 5504                                          * may get a partial chunk. The next
 5505                                          * read returning a new chunk...
 5506                                          * really ugly but I see no way
 5507                                          * around it! Maybe a notify??
 5508                                          */
 5509                                         asoc->strmin[chk->rec.data.stream_number].last_sequence_delivered =
 5510                                             chk->rec.data.stream_seq;
 5511                                 }
 5512                                 if (chk->data) {
 5513                                         sctp_m_freem(chk->data);
 5514                                         chk->data = NULL;
 5515                                 }
 5516                                 sctp_free_a_chunk(stcb, chk);
 5517                         } else {
 5518                                 /*
 5519                                  * Ok we have gone beyond the end of the
 5520                                  * fwd-tsn's mark. Some checks...
 5521                                  */
 5522                                 if ((asoc->fragmented_delivery_inprogress) &&
 5523                                     (chk->rec.data.rcv_flags & SCTP_DATA_FIRST_FRAG)) {
 5524                                         uint32_t str_seq;
 5525 
 5526                                         /*
 5527                                          * Special case PD-API is up and
 5528                                          * what we fwd-tsn' over includes
 5529                                          * one that had the LAST_FRAG. We no
 5530                                          * longer need to do the PD-API.
 5531                                          */
 5532                                         asoc->fragmented_delivery_inprogress = 0;
 5533 
 5534                                         str_seq = (asoc->str_of_pdapi << 16) | asoc->ssn_of_pdapi;
 5535                                         sctp_ulp_notify(SCTP_NOTIFY_PARTIAL_DELVIERY_INDICATION,
 5536                                             stcb, SCTP_PARTIAL_DELIVERY_ABORTED, (void *)&str_seq, SCTP_SO_NOT_LOCKED);
 5537 
 5538                                 }
 5539                                 break;
 5540                         }
 5541                         chk = at;
 5542                 }
 5543         }
 5544         if (asoc->fragmented_delivery_inprogress) {
 5545                 /*
 5546                  * Ok we removed cnt_gone chunks in the PD-API queue that
 5547                  * were being delivered. So now we must turn off the flag.
 5548                  */
 5549                 uint32_t str_seq;
 5550 
 5551                 str_seq = (asoc->str_of_pdapi << 16) | asoc->ssn_of_pdapi;
 5552                 sctp_ulp_notify(SCTP_NOTIFY_PARTIAL_DELVIERY_INDICATION,
 5553                     stcb, SCTP_PARTIAL_DELIVERY_ABORTED, (void *)&str_seq, SCTP_SO_NOT_LOCKED);
 5554                 asoc->fragmented_delivery_inprogress = 0;
 5555         }
 5556         /*************************************************************/
 5557         /* 3. Update the PR-stream re-ordering queues                */
 5558         /*************************************************************/
 5559         fwd_sz -= sizeof(*fwd);
 5560         if (m && fwd_sz) {
 5561                 /* New method. */
 5562                 unsigned int num_str;
 5563                 struct sctp_strseq *stseq, strseqbuf;
 5564 
 5565                 offset += sizeof(*fwd);
 5566 
 5567                 num_str = fwd_sz / sizeof(struct sctp_strseq);
 5568                 for (i = 0; i < num_str; i++) {
 5569                         uint16_t st;
 5570 
 5571                         stseq = (struct sctp_strseq *)sctp_m_getptr(m, offset,
 5572                             sizeof(struct sctp_strseq),
 5573                             (uint8_t *) & strseqbuf);
 5574                         offset += sizeof(struct sctp_strseq);
 5575                         if (stseq == NULL) {
 5576                                 break;
 5577                         }
 5578                         /* Convert */
 5579                         st = ntohs(stseq->stream);
 5580                         stseq->stream = st;
 5581                         st = ntohs(stseq->sequence);
 5582                         stseq->sequence = st;
 5583                         /* now process */
 5584                         if (stseq->stream >= asoc->streamincnt) {
 5585                                 /* screwed up streams, stop!  */
 5586                                 break;
 5587                         }
 5588                         strm = &asoc->strmin[stseq->stream];
 5589                         if (compare_with_wrap(stseq->sequence,
 5590                             strm->last_sequence_delivered, MAX_SEQ)) {
 5591                                 /* Update the sequence number */
 5592                                 strm->last_sequence_delivered =
 5593                                     stseq->sequence;
 5594                         }
 5595                         /* now kick the stream the new way */
 5596                         /* sa_ignore NO_NULL_CHK */
 5597                         sctp_kick_prsctp_reorder_queue(stcb, strm);
 5598                 }
 5599         }
 5600         if (TAILQ_FIRST(&asoc->reasmqueue)) {
 5601                 /* now lets kick out and check for more fragmented delivery */
 5602                 /* sa_ignore NO_NULL_CHK */
 5603                 sctp_deliver_reasm_check(stcb, &stcb->asoc);
 5604         }
 5605 }
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FreeBSD/Linux Kernel Cross Reference sys/netinet/sctp_indata.c

FreeBSD/Linux Kernel Cross Reference
sys/netinet/sctp_indata.c
