sctp6_usrreq.c

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    1 /*-
    2  * Copyright (c) 2001-2007, by Cisco Systems, Inc. All rights reserved.
    3  * Copyright (c) 2008-2012, by Randall Stewart. All rights reserved.
    4  * Copyright (c) 2008-2012, by Michael Tuexen. All rights reserved.
    5  *
    6  * Redistribution and use in source and binary forms, with or without
    7  * modification, are permitted provided that the following conditions are met:
    8  *
    9  * a) Redistributions of source code must retain the above copyright notice,
   10  *    this list of conditions and the following disclaimer.
   11  *
   12  * b) Redistributions in binary form must reproduce the above copyright
   13  *    notice, this list of conditions and the following disclaimer in
   14  *    the documentation and/or other materials provided with the distribution.
   15  *
   16  * c) Neither the name of Cisco Systems, Inc. nor the names of its
   17  *    contributors may be used to endorse or promote products derived
   18  *    from this software without specific prior written permission.
   19  *
   20  * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
   21  * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO,
   22  * THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
   23  * ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR CONTRIBUTORS BE
   24  * LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
   25  * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
   26  * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
   27  * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
   28  * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
   29  * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF
   30  * THE POSSIBILITY OF SUCH DAMAGE.
   31  */
   32 
   33 #include <sys/cdefs.h>
   34 __FBSDID("$FreeBSD: releng/10.3/sys/netinet6/sctp6_usrreq.c 296052 2016-02-25 18:46:06Z tuexen $");
   35 
   36 #include <netinet/sctp_os.h>
   37 #ifdef INET6
   38 #include <sys/proc.h>
   39 #include <netinet/sctp_pcb.h>
   40 #include <netinet/sctp_header.h>
   41 #include <netinet/sctp_var.h>
   42 #include <netinet6/sctp6_var.h>
   43 #include <netinet/sctp_sysctl.h>
   44 #include <netinet/sctp_output.h>
   45 #include <netinet/sctp_uio.h>
   46 #include <netinet/sctp_asconf.h>
   47 #include <netinet/sctputil.h>
   48 #include <netinet/sctp_indata.h>
   49 #include <netinet/sctp_timer.h>
   50 #include <netinet/sctp_auth.h>
   51 #include <netinet/sctp_input.h>
   52 #include <netinet/sctp_output.h>
   53 #include <netinet/sctp_bsd_addr.h>
   54 #include <netinet/sctp_crc32.h>
   55 #include <netinet/icmp6.h>
   56 #include <netinet/udp.h>
   57 
   58 #ifdef IPSEC
   59 #include <netipsec/ipsec.h>
   60 #include <netipsec/ipsec6.h>
   61 #endif                          /* IPSEC */
   62 
   63 extern struct protosw inetsw[];
   64 
   65 int
   66 sctp6_input_with_port(struct mbuf **i_pak, int *offp, uint16_t port)
   67 {
   68         struct mbuf *m;
   69         int iphlen;
   70         uint32_t vrf_id;
   71         uint8_t ecn_bits;
   72         struct sockaddr_in6 src, dst;
   73         struct ip6_hdr *ip6;
   74         struct sctphdr *sh;
   75         struct sctp_chunkhdr *ch;
   76         int length, offset;
   77 
   78 #if !defined(SCTP_WITH_NO_CSUM)
   79         uint8_t compute_crc;
   80 
   81 #endif
   82         uint32_t mflowid;
   83         uint8_t mflowtype;
   84         uint16_t fibnum;
   85 
   86         iphlen = *offp;
   87         if (SCTP_GET_PKT_VRFID(*i_pak, vrf_id)) {
   88                 SCTP_RELEASE_PKT(*i_pak);
   89                 return (IPPROTO_DONE);
   90         }
   91         m = SCTP_HEADER_TO_CHAIN(*i_pak);
   92 #ifdef SCTP_MBUF_LOGGING
   93         /* Log in any input mbufs */
   94         if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_MBUF_LOGGING_ENABLE) {
   95                 sctp_log_mbc(m, SCTP_MBUF_INPUT);
   96         }
   97 #endif
   98 #ifdef SCTP_PACKET_LOGGING
   99         if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_LAST_PACKET_TRACING) {
  100                 sctp_packet_log(m);
  101         }
  102 #endif
  103         SCTPDBG(SCTP_DEBUG_CRCOFFLOAD,
  104             "sctp6_input(): Packet of length %d received on %s with csum_flags 0x%b.\n",
  105             m->m_pkthdr.len,
  106             if_name(m->m_pkthdr.rcvif),
  107             (int)m->m_pkthdr.csum_flags, CSUM_BITS);
  108         mflowid = m->m_pkthdr.flowid;
  109         mflowtype = M_HASHTYPE_GET(m);
  110         fibnum = M_GETFIB(m);
  111         SCTP_STAT_INCR(sctps_recvpackets);
  112         SCTP_STAT_INCR_COUNTER64(sctps_inpackets);
  113         /* Get IP, SCTP, and first chunk header together in the first mbuf. */
  114         offset = iphlen + sizeof(struct sctphdr) + sizeof(struct sctp_chunkhdr);
  115         ip6 = mtod(m, struct ip6_hdr *);
  116         IP6_EXTHDR_GET(sh, struct sctphdr *, m, iphlen,
  117             (int)(sizeof(struct sctphdr) + sizeof(struct sctp_chunkhdr)));
  118         if (sh == NULL) {
  119                 SCTP_STAT_INCR(sctps_hdrops);
  120                 return (IPPROTO_DONE);
  121         }
  122         ch = (struct sctp_chunkhdr *)((caddr_t)sh + sizeof(struct sctphdr));
  123         offset -= sizeof(struct sctp_chunkhdr);
  124         memset(&src, 0, sizeof(struct sockaddr_in6));
  125         src.sin6_family = AF_INET6;
  126         src.sin6_len = sizeof(struct sockaddr_in6);
  127         src.sin6_port = sh->src_port;
  128         src.sin6_addr = ip6->ip6_src;
  129         if (in6_setscope(&src.sin6_addr, m->m_pkthdr.rcvif, NULL) != 0) {
  130                 goto out;
  131         }
  132         memset(&dst, 0, sizeof(struct sockaddr_in6));
  133         dst.sin6_family = AF_INET6;
  134         dst.sin6_len = sizeof(struct sockaddr_in6);
  135         dst.sin6_port = sh->dest_port;
  136         dst.sin6_addr = ip6->ip6_dst;
  137         if (in6_setscope(&dst.sin6_addr, m->m_pkthdr.rcvif, NULL) != 0) {
  138                 goto out;
  139         }
  140         if (faithprefix_p != NULL && (*faithprefix_p) (&dst.sin6_addr)) {
  141                 /* XXX send icmp6 host/port unreach? */
  142                 goto out;
  143         }
  144         length = ntohs(ip6->ip6_plen) + iphlen;
  145         /* Validate mbuf chain length with IP payload length. */
  146         if (SCTP_HEADER_LEN(m) != length) {
  147                 SCTPDBG(SCTP_DEBUG_INPUT1,
  148                     "sctp6_input() length:%d reported length:%d\n", length, SCTP_HEADER_LEN(m));
  149                 SCTP_STAT_INCR(sctps_hdrops);
  150                 goto out;
  151         }
  152         if (IN6_IS_ADDR_MULTICAST(&ip6->ip6_dst)) {
  153                 goto out;
  154         }
  155         ecn_bits = ((ntohl(ip6->ip6_flow) >> 20) & 0x000000ff);
  156 #if defined(SCTP_WITH_NO_CSUM)
  157         SCTP_STAT_INCR(sctps_recvnocrc);
  158 #else
  159         if (m->m_pkthdr.csum_flags & CSUM_SCTP_VALID) {
  160                 SCTP_STAT_INCR(sctps_recvhwcrc);
  161                 compute_crc = 0;
  162         } else {
  163                 SCTP_STAT_INCR(sctps_recvswcrc);
  164                 compute_crc = 1;
  165         }
  166 #endif
  167         sctp_common_input_processing(&m, iphlen, offset, length,
  168             (struct sockaddr *)&src,
  169             (struct sockaddr *)&dst,
  170             sh, ch,
  171 #if !defined(SCTP_WITH_NO_CSUM)
  172             compute_crc,
  173 #endif
  174             ecn_bits,
  175             mflowtype, mflowid, fibnum,
  176             vrf_id, port);
  177 out:
  178         if (m) {
  179                 sctp_m_freem(m);
  180         }
  181         return (IPPROTO_DONE);
  182 }
  183 
  184 
  185 int
  186 sctp6_input(struct mbuf **i_pak, int *offp, int proto SCTP_UNUSED)
  187 {
  188         return (sctp6_input_with_port(i_pak, offp, 0));
  189 }
  190 
  191 static void
  192 sctp6_notify_mbuf(struct sctp_inpcb *inp, struct icmp6_hdr *icmp6,
  193     struct sctphdr *sh, struct sctp_tcb *stcb, struct sctp_nets *net)
  194 {
  195         uint32_t nxtsz;
  196 
  197         if ((inp == NULL) || (stcb == NULL) || (net == NULL) ||
  198             (icmp6 == NULL) || (sh == NULL)) {
  199                 goto out;
  200         }
  201         /* First do we even look at it? */
  202         if (ntohl(sh->v_tag) != (stcb->asoc.peer_vtag))
  203                 goto out;
  204 
  205         if (icmp6->icmp6_type != ICMP6_PACKET_TOO_BIG) {
  206                 /* not PACKET TO BIG */
  207                 goto out;
  208         }
  209         /*
  210          * ok we need to look closely. We could even get smarter and look at
  211          * anyone that we sent to in case we get a different ICMP that tells
  212          * us there is no way to reach a host, but for this impl, all we
  213          * care about is MTU discovery.
  214          */
  215         nxtsz = ntohl(icmp6->icmp6_mtu);
  216         /* Stop any PMTU timer */
  217         sctp_timer_stop(SCTP_TIMER_TYPE_PATHMTURAISE, inp, stcb, NULL,
  218             SCTP_FROM_SCTP6_USRREQ + SCTP_LOC_1);
  219 
  220         /* Adjust destination size limit */
  221         if (net->mtu > nxtsz) {
  222                 net->mtu = nxtsz;
  223                 if (net->port) {
  224                         net->mtu -= sizeof(struct udphdr);
  225                 }
  226         }
  227         /* now what about the ep? */
  228         if (stcb->asoc.smallest_mtu > nxtsz) {
  229                 struct sctp_tmit_chunk *chk;
  230 
  231                 /* Adjust that too */
  232                 stcb->asoc.smallest_mtu = nxtsz;
  233                 /* now off to subtract IP_DF flag if needed */
  234 
  235                 TAILQ_FOREACH(chk, &stcb->asoc.send_queue, sctp_next) {
  236                         if ((uint32_t) (chk->send_size + IP_HDR_SIZE) > nxtsz) {
  237                                 chk->flags |= CHUNK_FLAGS_FRAGMENT_OK;
  238                         }
  239                 }
  240                 TAILQ_FOREACH(chk, &stcb->asoc.sent_queue, sctp_next) {
  241                         if ((uint32_t) (chk->send_size + IP_HDR_SIZE) > nxtsz) {
  242                                 /*
  243                                  * For this guy we also mark for immediate
  244                                  * resend since we sent to big of chunk
  245                                  */
  246                                 chk->flags |= CHUNK_FLAGS_FRAGMENT_OK;
  247                                 if (chk->sent != SCTP_DATAGRAM_RESEND)
  248                                         stcb->asoc.sent_queue_retran_cnt++;
  249                                 chk->sent = SCTP_DATAGRAM_RESEND;
  250                                 chk->rec.data.doing_fast_retransmit = 0;
  251 
  252                                 chk->sent = SCTP_DATAGRAM_RESEND;
  253                                 /* Clear any time so NO RTT is being done */
  254                                 chk->sent_rcv_time.tv_sec = 0;
  255                                 chk->sent_rcv_time.tv_usec = 0;
  256                                 stcb->asoc.total_flight -= chk->send_size;
  257                                 net->flight_size -= chk->send_size;
  258                         }
  259                 }
  260         }
  261         sctp_timer_start(SCTP_TIMER_TYPE_PATHMTURAISE, inp, stcb, NULL);
  262 out:
  263         if (stcb) {
  264                 SCTP_TCB_UNLOCK(stcb);
  265         }
  266 }
  267 
  268 
  269 void
  270 sctp6_notify(struct sctp_inpcb *inp,
  271     struct icmp6_hdr *icmph,
  272     struct sctphdr *sh,
  273     struct sockaddr *to,
  274     struct sctp_tcb *stcb,
  275     struct sctp_nets *net)
  276 {
  277 #if defined(__APPLE__) || defined(SCTP_SO_LOCK_TESTING)
  278         struct socket *so;
  279 
  280 #endif
  281 
  282         /* protection */
  283         if ((inp == NULL) || (stcb == NULL) || (net == NULL) ||
  284             (sh == NULL) || (to == NULL)) {
  285                 if (stcb)
  286                         SCTP_TCB_UNLOCK(stcb);
  287                 return;
  288         }
  289         /* First job is to verify the vtag matches what I would send */
  290         if (ntohl(sh->v_tag) != (stcb->asoc.peer_vtag)) {
  291                 SCTP_TCB_UNLOCK(stcb);
  292                 return;
  293         }
  294         if (icmph->icmp6_type != ICMP_UNREACH) {
  295                 /* We only care about unreachable */
  296                 SCTP_TCB_UNLOCK(stcb);
  297                 return;
  298         }
  299         if ((icmph->icmp6_code == ICMP_UNREACH_NET) ||
  300             (icmph->icmp6_code == ICMP_UNREACH_HOST) ||
  301             (icmph->icmp6_code == ICMP_UNREACH_NET_UNKNOWN) ||
  302             (icmph->icmp6_code == ICMP_UNREACH_HOST_UNKNOWN) ||
  303             (icmph->icmp6_code == ICMP_UNREACH_ISOLATED) ||
  304             (icmph->icmp6_code == ICMP_UNREACH_NET_PROHIB) ||
  305             (icmph->icmp6_code == ICMP_UNREACH_HOST_PROHIB) ||
  306             (icmph->icmp6_code == ICMP_UNREACH_FILTER_PROHIB)) {
  307 
  308                 /*
  309                  * Hmm reachablity problems we must examine closely. If its
  310                  * not reachable, we may have lost a network. Or if there is
  311                  * NO protocol at the other end named SCTP. well we consider
  312                  * it a OOTB abort.
  313                  */
  314                 if (net->dest_state & SCTP_ADDR_REACHABLE) {
  315                         /* Ok that destination is NOT reachable */
  316                         net->dest_state &= ~SCTP_ADDR_REACHABLE;
  317                         net->dest_state &= ~SCTP_ADDR_PF;
  318                         sctp_ulp_notify(SCTP_NOTIFY_INTERFACE_DOWN,
  319                             stcb, 0, (void *)net, SCTP_SO_NOT_LOCKED);
  320                 }
  321                 SCTP_TCB_UNLOCK(stcb);
  322         } else if ((icmph->icmp6_code == ICMP_UNREACH_PROTOCOL) ||
  323             (icmph->icmp6_code == ICMP_UNREACH_PORT)) {
  324                 /*
  325                  * Here the peer is either playing tricks on us, including
  326                  * an address that belongs to someone who does not support
  327                  * SCTP OR was a userland implementation that shutdown and
  328                  * now is dead. In either case treat it like a OOTB abort
  329                  * with no TCB
  330                  */
  331                 sctp_abort_notification(stcb, 1, 0, NULL, SCTP_SO_NOT_LOCKED);
  332 #if defined(__APPLE__) || defined(SCTP_SO_LOCK_TESTING)
  333                 so = SCTP_INP_SO(inp);
  334                 atomic_add_int(&stcb->asoc.refcnt, 1);
  335                 SCTP_TCB_UNLOCK(stcb);
  336                 SCTP_SOCKET_LOCK(so, 1);
  337                 SCTP_TCB_LOCK(stcb);
  338                 atomic_subtract_int(&stcb->asoc.refcnt, 1);
  339 #endif
  340                 (void)sctp_free_assoc(inp, stcb, SCTP_NORMAL_PROC,
  341                     SCTP_FROM_SCTP6_USRREQ + SCTP_LOC_2);
  342 #if defined(__APPLE__) || defined(SCTP_SO_LOCK_TESTING)
  343                 SCTP_SOCKET_UNLOCK(so, 1);
  344                 /* SCTP_TCB_UNLOCK(stcb); MT: I think this is not needed. */
  345 #endif
  346                 /* no need to unlock here, since the TCB is gone */
  347         } else {
  348                 SCTP_TCB_UNLOCK(stcb);
  349         }
  350 }
  351 
  352 
  353 
  354 void
  355 sctp6_ctlinput(int cmd, struct sockaddr *pktdst, void *d)
  356 {
  357         struct sctphdr sh;
  358         struct ip6ctlparam *ip6cp = NULL;
  359         uint32_t vrf_id;
  360 
  361         vrf_id = SCTP_DEFAULT_VRFID;
  362 
  363         if (pktdst->sa_family != AF_INET6 ||
  364             pktdst->sa_len != sizeof(struct sockaddr_in6))
  365                 return;
  366 
  367         if ((unsigned)cmd >= PRC_NCMDS)
  368                 return;
  369         if (PRC_IS_REDIRECT(cmd)) {
  370                 d = NULL;
  371         } else if (inet6ctlerrmap[cmd] == 0) {
  372                 return;
  373         }
  374         /* if the parameter is from icmp6, decode it. */
  375         if (d != NULL) {
  376                 ip6cp = (struct ip6ctlparam *)d;
  377         } else {
  378                 ip6cp = (struct ip6ctlparam *)NULL;
  379         }
  380 
  381         if (ip6cp) {
  382                 /*
  383                  * XXX: We assume that when IPV6 is non NULL, M and OFF are
  384                  * valid.
  385                  */
  386                 struct sctp_inpcb *inp = NULL;
  387                 struct sctp_tcb *stcb = NULL;
  388                 struct sctp_nets *net = NULL;
  389                 struct sockaddr_in6 final;
  390 
  391                 if (ip6cp->ip6c_m == NULL)
  392                         return;
  393 
  394                 /* Check if we can safely examine the SCTP header. */
  395                 if (ip6cp->ip6c_m->m_pkthdr.len < ip6cp->ip6c_off + sizeof(sh))
  396                         return;
  397 
  398                 bzero(&sh, sizeof(sh));
  399                 bzero(&final, sizeof(final));
  400                 inp = NULL;
  401                 net = NULL;
  402                 m_copydata(ip6cp->ip6c_m, ip6cp->ip6c_off, sizeof(sh),
  403                     (caddr_t)&sh);
  404                 ip6cp->ip6c_src->sin6_port = sh.src_port;
  405                 final.sin6_len = sizeof(final);
  406                 final.sin6_family = AF_INET6;
  407                 final.sin6_addr = ((struct sockaddr_in6 *)pktdst)->sin6_addr;
  408                 final.sin6_port = sh.dest_port;
  409                 stcb = sctp_findassociation_addr_sa((struct sockaddr *)&final,
  410                     (struct sockaddr *)ip6cp->ip6c_src,
  411                     &inp, &net, 1, vrf_id);
  412                 /* inp's ref-count increased && stcb locked */
  413                 if (stcb != NULL && inp && (inp->sctp_socket != NULL)) {
  414                         if (cmd == PRC_MSGSIZE) {
  415                                 sctp6_notify_mbuf(inp,
  416                                     ip6cp->ip6c_icmp6,
  417                                     &sh,
  418                                     stcb,
  419                                     net);
  420                                 /* inp's ref-count reduced && stcb unlocked */
  421                         } else {
  422                                 sctp6_notify(inp, ip6cp->ip6c_icmp6, &sh,
  423                                     (struct sockaddr *)&final,
  424                                     stcb, net);
  425                                 /* inp's ref-count reduced && stcb unlocked */
  426                         }
  427                 } else {
  428                         if (PRC_IS_REDIRECT(cmd) && inp) {
  429                                 in6_rtchange((struct in6pcb *)inp,
  430                                     inet6ctlerrmap[cmd]);
  431                         }
  432                         if (inp) {
  433                                 /* reduce inp's ref-count */
  434                                 SCTP_INP_WLOCK(inp);
  435                                 SCTP_INP_DECR_REF(inp);
  436                                 SCTP_INP_WUNLOCK(inp);
  437                         }
  438                         if (stcb)
  439                                 SCTP_TCB_UNLOCK(stcb);
  440                 }
  441         }
  442 }
  443 
  444 /*
  445  * this routine can probably be collasped into the one in sctp_userreq.c
  446  * since they do the same thing and now we lookup with a sockaddr
  447  */
  448 static int
  449 sctp6_getcred(SYSCTL_HANDLER_ARGS)
  450 {
  451         struct xucred xuc;
  452         struct sockaddr_in6 addrs[2];
  453         struct sctp_inpcb *inp;
  454         struct sctp_nets *net;
  455         struct sctp_tcb *stcb;
  456         int error;
  457         uint32_t vrf_id;
  458 
  459         vrf_id = SCTP_DEFAULT_VRFID;
  460 
  461         error = priv_check(req->td, PRIV_NETINET_GETCRED);
  462         if (error)
  463                 return (error);
  464 
  465         if (req->newlen != sizeof(addrs)) {
  466                 SCTP_LTRACE_ERR_RET(NULL, NULL, NULL, SCTP_FROM_SCTP6_USRREQ, EINVAL);
  467                 return (EINVAL);
  468         }
  469         if (req->oldlen != sizeof(struct ucred)) {
  470                 SCTP_LTRACE_ERR_RET(NULL, NULL, NULL, SCTP_FROM_SCTP6_USRREQ, EINVAL);
  471                 return (EINVAL);
  472         }
  473         error = SYSCTL_IN(req, addrs, sizeof(addrs));
  474         if (error)
  475                 return (error);
  476 
  477         stcb = sctp_findassociation_addr_sa(sin6tosa(&addrs[1]),
  478             sin6tosa(&addrs[0]),
  479             &inp, &net, 1, vrf_id);
  480         if (stcb == NULL || inp == NULL || inp->sctp_socket == NULL) {
  481                 if ((inp != NULL) && (stcb == NULL)) {
  482                         /* reduce ref-count */
  483                         SCTP_INP_WLOCK(inp);
  484                         SCTP_INP_DECR_REF(inp);
  485                         goto cred_can_cont;
  486                 }
  487                 SCTP_LTRACE_ERR_RET(inp, NULL, NULL, SCTP_FROM_SCTP6_USRREQ, ENOENT);
  488                 error = ENOENT;
  489                 goto out;
  490         }
  491         SCTP_TCB_UNLOCK(stcb);
  492         /*
  493          * We use the write lock here, only since in the error leg we need
  494          * it. If we used RLOCK, then we would have to
  495          * wlock/decr/unlock/rlock. Which in theory could create a hole.
  496          * Better to use higher wlock.
  497          */
  498         SCTP_INP_WLOCK(inp);
  499 cred_can_cont:
  500         error = cr_canseesocket(req->td->td_ucred, inp->sctp_socket);
  501         if (error) {
  502                 SCTP_INP_WUNLOCK(inp);
  503                 goto out;
  504         }
  505         cru2x(inp->sctp_socket->so_cred, &xuc);
  506         SCTP_INP_WUNLOCK(inp);
  507         error = SYSCTL_OUT(req, &xuc, sizeof(struct xucred));
  508 out:
  509         return (error);
  510 }
  511 
  512 SYSCTL_PROC(_net_inet6_sctp6, OID_AUTO, getcred, CTLTYPE_OPAQUE | CTLFLAG_RW,
  513     0, 0,
  514     sctp6_getcred, "S,ucred", "Get the ucred of a SCTP6 connection");
  515 
  516 
  517 /* This is the same as the sctp_abort() could be made common */
  518 static void
  519 sctp6_abort(struct socket *so)
  520 {
  521         struct sctp_inpcb *inp;
  522         uint32_t flags;
  523 
  524         inp = (struct sctp_inpcb *)so->so_pcb;
  525         if (inp == NULL) {
  526                 SCTP_LTRACE_ERR_RET(inp, NULL, NULL, SCTP_FROM_SCTP6_USRREQ, EINVAL);
  527                 return;
  528         }
  529 sctp_must_try_again:
  530         flags = inp->sctp_flags;
  531 #ifdef SCTP_LOG_CLOSING
  532         sctp_log_closing(inp, NULL, 17);
  533 #endif
  534         if (((flags & SCTP_PCB_FLAGS_SOCKET_GONE) == 0) &&
  535             (atomic_cmpset_int(&inp->sctp_flags, flags, (flags | SCTP_PCB_FLAGS_SOCKET_GONE | SCTP_PCB_FLAGS_CLOSE_IP)))) {
  536 #ifdef SCTP_LOG_CLOSING
  537                 sctp_log_closing(inp, NULL, 16);
  538 #endif
  539                 sctp_inpcb_free(inp, SCTP_FREE_SHOULD_USE_ABORT,
  540                     SCTP_CALLED_AFTER_CMPSET_OFCLOSE);
  541                 SOCK_LOCK(so);
  542                 SCTP_SB_CLEAR(so->so_snd);
  543                 /*
  544                  * same for the rcv ones, they are only here for the
  545                  * accounting/select.
  546                  */
  547                 SCTP_SB_CLEAR(so->so_rcv);
  548                 /* Now null out the reference, we are completely detached. */
  549                 so->so_pcb = NULL;
  550                 SOCK_UNLOCK(so);
  551         } else {
  552                 flags = inp->sctp_flags;
  553                 if ((flags & SCTP_PCB_FLAGS_SOCKET_GONE) == 0) {
  554                         goto sctp_must_try_again;
  555                 }
  556         }
  557         return;
  558 }
  559 
  560 static int
  561 sctp6_attach(struct socket *so, int proto SCTP_UNUSED, struct thread *p SCTP_UNUSED)
  562 {
  563         struct in6pcb *inp6;
  564         int error;
  565         struct sctp_inpcb *inp;
  566         uint32_t vrf_id = SCTP_DEFAULT_VRFID;
  567 
  568         inp = (struct sctp_inpcb *)so->so_pcb;
  569         if (inp != NULL) {
  570                 SCTP_LTRACE_ERR_RET(inp, NULL, NULL, SCTP_FROM_SCTP6_USRREQ, EINVAL);
  571                 return (EINVAL);
  572         }
  573         if (so->so_snd.sb_hiwat == 0 || so->so_rcv.sb_hiwat == 0) {
  574                 error = SCTP_SORESERVE(so, SCTP_BASE_SYSCTL(sctp_sendspace), SCTP_BASE_SYSCTL(sctp_recvspace));
  575                 if (error)
  576                         return (error);
  577         }
  578         error = sctp_inpcb_alloc(so, vrf_id);
  579         if (error)
  580                 return (error);
  581         inp = (struct sctp_inpcb *)so->so_pcb;
  582         SCTP_INP_WLOCK(inp);
  583         inp->sctp_flags |= SCTP_PCB_FLAGS_BOUND_V6;     /* I'm v6! */
  584         inp6 = (struct in6pcb *)inp;
  585 
  586         inp6->inp_vflag |= INP_IPV6;
  587         inp6->in6p_hops = -1;   /* use kernel default */
  588         inp6->in6p_cksum = -1;  /* just to be sure */
  589 #ifdef INET
  590         /*
  591          * XXX: ugly!! IPv4 TTL initialization is necessary for an IPv6
  592          * socket as well, because the socket may be bound to an IPv6
  593          * wildcard address, which may match an IPv4-mapped IPv6 address.
  594          */
  595         inp6->inp_ip_ttl = MODULE_GLOBAL(ip_defttl);
  596 #endif
  597         /*
  598          * Hmm what about the IPSEC stuff that is missing here but in
  599          * sctp_attach()?
  600          */
  601         SCTP_INP_WUNLOCK(inp);
  602         return (0);
  603 }
  604 
  605 static int
  606 sctp6_bind(struct socket *so, struct sockaddr *addr, struct thread *p)
  607 {
  608         struct sctp_inpcb *inp;
  609         struct in6pcb *inp6;
  610         int error;
  611 
  612         inp = (struct sctp_inpcb *)so->so_pcb;
  613         if (inp == NULL) {
  614                 SCTP_LTRACE_ERR_RET(inp, NULL, NULL, SCTP_FROM_SCTP6_USRREQ, EINVAL);
  615                 return (EINVAL);
  616         }
  617         if (addr) {
  618                 switch (addr->sa_family) {
  619 #ifdef INET
  620                 case AF_INET:
  621                         if (addr->sa_len != sizeof(struct sockaddr_in)) {
  622                                 SCTP_LTRACE_ERR_RET(inp, NULL, NULL, SCTP_FROM_SCTP6_USRREQ, EINVAL);
  623                                 return (EINVAL);
  624                         }
  625                         break;
  626 #endif
  627 #ifdef INET6
  628                 case AF_INET6:
  629                         if (addr->sa_len != sizeof(struct sockaddr_in6)) {
  630                                 SCTP_LTRACE_ERR_RET(inp, NULL, NULL, SCTP_FROM_SCTP6_USRREQ, EINVAL);
  631                                 return (EINVAL);
  632                         }
  633                         break;
  634 #endif
  635                 default:
  636                         SCTP_LTRACE_ERR_RET(inp, NULL, NULL, SCTP_FROM_SCTP6_USRREQ, EINVAL);
  637                         return (EINVAL);
  638                 }
  639         }
  640         inp6 = (struct in6pcb *)inp;
  641         inp6->inp_vflag &= ~INP_IPV4;
  642         inp6->inp_vflag |= INP_IPV6;
  643         if ((addr != NULL) && (SCTP_IPV6_V6ONLY(inp6) == 0)) {
  644                 switch (addr->sa_family) {
  645 #ifdef INET
  646                 case AF_INET:
  647                         /* binding v4 addr to v6 socket, so reset flags */
  648                         inp6->inp_vflag |= INP_IPV4;
  649                         inp6->inp_vflag &= ~INP_IPV6;
  650                         break;
  651 #endif
  652 #ifdef INET6
  653                 case AF_INET6:
  654                         {
  655                                 struct sockaddr_in6 *sin6_p;
  656 
  657                                 sin6_p = (struct sockaddr_in6 *)addr;
  658 
  659                                 if (IN6_IS_ADDR_UNSPECIFIED(&sin6_p->sin6_addr)) {
  660                                         inp6->inp_vflag |= INP_IPV4;
  661                                 }
  662 #ifdef INET
  663                                 if (IN6_IS_ADDR_V4MAPPED(&sin6_p->sin6_addr)) {
  664                                         struct sockaddr_in sin;
  665 
  666                                         in6_sin6_2_sin(&sin, sin6_p);
  667                                         inp6->inp_vflag |= INP_IPV4;
  668                                         inp6->inp_vflag &= ~INP_IPV6;
  669                                         error = sctp_inpcb_bind(so, (struct sockaddr *)&sin, NULL, p);
  670                                         return (error);
  671                                 }
  672 #endif
  673                                 break;
  674                         }
  675 #endif
  676                 default:
  677                         break;
  678                 }
  679         } else if (addr != NULL) {
  680                 struct sockaddr_in6 *sin6_p;
  681 
  682                 /* IPV6_V6ONLY socket */
  683 #ifdef INET
  684                 if (addr->sa_family == AF_INET) {
  685                         /* can't bind v4 addr to v6 only socket! */
  686                         SCTP_LTRACE_ERR_RET(inp, NULL, NULL, SCTP_FROM_SCTP6_USRREQ, EINVAL);
  687                         return (EINVAL);
  688                 }
  689 #endif
  690                 sin6_p = (struct sockaddr_in6 *)addr;
  691 
  692                 if (IN6_IS_ADDR_V4MAPPED(&sin6_p->sin6_addr)) {
  693                         /* can't bind v4-mapped addrs either! */
  694                         /* NOTE: we don't support SIIT */
  695                         SCTP_LTRACE_ERR_RET(inp, NULL, NULL, SCTP_FROM_SCTP6_USRREQ, EINVAL);
  696                         return (EINVAL);
  697                 }
  698         }
  699         error = sctp_inpcb_bind(so, addr, NULL, p);
  700         return (error);
  701 }
  702 
  703 
  704 static void
  705 sctp6_close(struct socket *so)
  706 {
  707         sctp_close(so);
  708 }
  709 
  710 /* This could be made common with sctp_detach() since they are identical */
  711 
  712 static
  713 int
  714 sctp6_disconnect(struct socket *so)
  715 {
  716         return (sctp_disconnect(so));
  717 }
  718 
  719 
  720 int
  721 sctp_sendm(struct socket *so, int flags, struct mbuf *m, struct sockaddr *addr,
  722     struct mbuf *control, struct thread *p);
  723 
  724 
  725 static int
  726 sctp6_send(struct socket *so, int flags, struct mbuf *m, struct sockaddr *addr,
  727     struct mbuf *control, struct thread *p)
  728 {
  729         struct sctp_inpcb *inp;
  730         struct in6pcb *inp6;
  731 
  732 #ifdef INET
  733         struct sockaddr_in6 *sin6;
  734 
  735 #endif                          /* INET */
  736         /* No SPL needed since sctp_output does this */
  737 
  738         inp = (struct sctp_inpcb *)so->so_pcb;
  739         if (inp == NULL) {
  740                 if (control) {
  741                         SCTP_RELEASE_PKT(control);
  742                         control = NULL;
  743                 }
  744                 SCTP_RELEASE_PKT(m);
  745                 SCTP_LTRACE_ERR_RET(inp, NULL, NULL, SCTP_FROM_SCTP6_USRREQ, EINVAL);
  746                 return (EINVAL);
  747         }
  748         inp6 = (struct in6pcb *)inp;
  749         /*
  750          * For the TCP model we may get a NULL addr, if we are a connected
  751          * socket thats ok.
  752          */
  753         if ((inp->sctp_flags & SCTP_PCB_FLAGS_CONNECTED) &&
  754             (addr == NULL)) {
  755                 goto connected_type;
  756         }
  757         if (addr == NULL) {
  758                 SCTP_RELEASE_PKT(m);
  759                 if (control) {
  760                         SCTP_RELEASE_PKT(control);
  761                         control = NULL;
  762                 }
  763                 SCTP_LTRACE_ERR_RET(inp, NULL, NULL, SCTP_FROM_SCTP6_USRREQ, EDESTADDRREQ);
  764                 return (EDESTADDRREQ);
  765         }
  766 #ifdef INET
  767         sin6 = (struct sockaddr_in6 *)addr;
  768         if (SCTP_IPV6_V6ONLY(inp6)) {
  769                 /*
  770                  * if IPV6_V6ONLY flag, we discard datagrams destined to a
  771                  * v4 addr or v4-mapped addr
  772                  */
  773                 if (addr->sa_family == AF_INET) {
  774                         SCTP_LTRACE_ERR_RET(inp, NULL, NULL, SCTP_FROM_SCTP6_USRREQ, EINVAL);
  775                         return (EINVAL);
  776                 }
  777                 if (IN6_IS_ADDR_V4MAPPED(&sin6->sin6_addr)) {
  778                         SCTP_LTRACE_ERR_RET(inp, NULL, NULL, SCTP_FROM_SCTP6_USRREQ, EINVAL);
  779                         return (EINVAL);
  780                 }
  781         }
  782         if (IN6_IS_ADDR_V4MAPPED(&sin6->sin6_addr)) {
  783                 struct sockaddr_in sin;
  784 
  785                 /* convert v4-mapped into v4 addr and send */
  786                 in6_sin6_2_sin(&sin, sin6);
  787                 return (sctp_sendm(so, flags, m, (struct sockaddr *)&sin, control, p));
  788         }
  789 #endif                          /* INET */
  790 connected_type:
  791         /* now what about control */
  792         if (control) {
  793                 if (inp->control) {
  794                         SCTP_PRINTF("huh? control set?\n");
  795                         SCTP_RELEASE_PKT(inp->control);
  796                         inp->control = NULL;
  797                 }
  798                 inp->control = control;
  799         }
  800         /* Place the data */
  801         if (inp->pkt) {
  802                 SCTP_BUF_NEXT(inp->pkt_last) = m;
  803                 inp->pkt_last = m;
  804         } else {
  805                 inp->pkt_last = inp->pkt = m;
  806         }
  807         if (
  808         /* FreeBSD and MacOSX uses a flag passed */
  809             ((flags & PRUS_MORETOCOME) == 0)
  810             ) {
  811                 /*
  812                  * note with the current version this code will only be used
  813                  * by OpenBSD, NetBSD and FreeBSD have methods for
  814                  * re-defining sosend() to use sctp_sosend().  One can
  815                  * optionaly switch back to this code (by changing back the
  816                  * defininitions but this is not advisable.
  817                  */
  818                 int ret;
  819 
  820                 ret = sctp_output(inp, inp->pkt, addr, inp->control, p, flags);
  821                 inp->pkt = NULL;
  822                 inp->control = NULL;
  823                 return (ret);
  824         } else {
  825                 return (0);
  826         }
  827 }
  828 
  829 static int
  830 sctp6_connect(struct socket *so, struct sockaddr *addr, struct thread *p)
  831 {
  832         uint32_t vrf_id;
  833         int error = 0;
  834         struct sctp_inpcb *inp;
  835         struct sctp_tcb *stcb;
  836 
  837 #ifdef INET
  838         struct in6pcb *inp6;
  839         struct sockaddr_in6 *sin6;
  840         union sctp_sockstore store;
  841 
  842 #endif
  843 
  844 #ifdef INET
  845         inp6 = (struct in6pcb *)so->so_pcb;
  846 #endif
  847         inp = (struct sctp_inpcb *)so->so_pcb;
  848         if (inp == NULL) {
  849                 SCTP_LTRACE_ERR_RET(inp, NULL, NULL, SCTP_FROM_SCTP6_USRREQ, ECONNRESET);
  850                 return (ECONNRESET);    /* I made the same as TCP since we are
  851                                          * not setup? */
  852         }
  853         if (addr == NULL) {
  854                 SCTP_LTRACE_ERR_RET(inp, NULL, NULL, SCTP_FROM_SCTP6_USRREQ, EINVAL);
  855                 return (EINVAL);
  856         }
  857         switch (addr->sa_family) {
  858 #ifdef INET
  859         case AF_INET:
  860                 if (addr->sa_len != sizeof(struct sockaddr_in)) {
  861                         SCTP_LTRACE_ERR_RET(inp, NULL, NULL, SCTP_FROM_SCTP6_USRREQ, EINVAL);
  862                         return (EINVAL);
  863                 }
  864                 break;
  865 #endif
  866 #ifdef INET6
  867         case AF_INET6:
  868                 if (addr->sa_len != sizeof(struct sockaddr_in6)) {
  869                         SCTP_LTRACE_ERR_RET(inp, NULL, NULL, SCTP_FROM_SCTP6_USRREQ, EINVAL);
  870                         return (EINVAL);
  871                 }
  872                 break;
  873 #endif
  874         default:
  875                 SCTP_LTRACE_ERR_RET(inp, NULL, NULL, SCTP_FROM_SCTP6_USRREQ, EINVAL);
  876                 return (EINVAL);
  877         }
  878 
  879         vrf_id = inp->def_vrf_id;
  880         SCTP_ASOC_CREATE_LOCK(inp);
  881         SCTP_INP_RLOCK(inp);
  882         if ((inp->sctp_flags & SCTP_PCB_FLAGS_UNBOUND) ==
  883             SCTP_PCB_FLAGS_UNBOUND) {
  884                 /* Bind a ephemeral port */
  885                 SCTP_INP_RUNLOCK(inp);
  886                 error = sctp6_bind(so, NULL, p);
  887                 if (error) {
  888                         SCTP_ASOC_CREATE_UNLOCK(inp);
  889 
  890                         return (error);
  891                 }
  892                 SCTP_INP_RLOCK(inp);
  893         }
  894         if ((inp->sctp_flags & SCTP_PCB_FLAGS_TCPTYPE) &&
  895             (inp->sctp_flags & SCTP_PCB_FLAGS_CONNECTED)) {
  896                 /* We are already connected AND the TCP model */
  897                 SCTP_INP_RUNLOCK(inp);
  898                 SCTP_ASOC_CREATE_UNLOCK(inp);
  899                 SCTP_LTRACE_ERR_RET(inp, NULL, NULL, SCTP_FROM_SCTP6_USRREQ, EADDRINUSE);
  900                 return (EADDRINUSE);
  901         }
  902 #ifdef INET
  903         sin6 = (struct sockaddr_in6 *)addr;
  904         if (SCTP_IPV6_V6ONLY(inp6)) {
  905                 /*
  906                  * if IPV6_V6ONLY flag, ignore connections destined to a v4
  907                  * addr or v4-mapped addr
  908                  */
  909                 if (addr->sa_family == AF_INET) {
  910                         SCTP_INP_RUNLOCK(inp);
  911                         SCTP_ASOC_CREATE_UNLOCK(inp);
  912                         SCTP_LTRACE_ERR_RET(inp, NULL, NULL, SCTP_FROM_SCTP6_USRREQ, EINVAL);
  913                         return (EINVAL);
  914                 }
  915                 if (IN6_IS_ADDR_V4MAPPED(&sin6->sin6_addr)) {
  916                         SCTP_INP_RUNLOCK(inp);
  917                         SCTP_ASOC_CREATE_UNLOCK(inp);
  918                         SCTP_LTRACE_ERR_RET(inp, NULL, NULL, SCTP_FROM_SCTP6_USRREQ, EINVAL);
  919                         return (EINVAL);
  920                 }
  921         }
  922         if (IN6_IS_ADDR_V4MAPPED(&sin6->sin6_addr)) {
  923                 /* convert v4-mapped into v4 addr */
  924                 in6_sin6_2_sin(&store.sin, sin6);
  925                 addr = &store.sa;
  926         }
  927 #endif                          /* INET */
  928         /* Now do we connect? */
  929         if (inp->sctp_flags & SCTP_PCB_FLAGS_CONNECTED) {
  930                 stcb = LIST_FIRST(&inp->sctp_asoc_list);
  931                 if (stcb) {
  932                         SCTP_TCB_UNLOCK(stcb);
  933                 }
  934                 SCTP_INP_RUNLOCK(inp);
  935         } else {
  936                 SCTP_INP_RUNLOCK(inp);
  937                 SCTP_INP_WLOCK(inp);
  938                 SCTP_INP_INCR_REF(inp);
  939                 SCTP_INP_WUNLOCK(inp);
  940                 stcb = sctp_findassociation_ep_addr(&inp, addr, NULL, NULL, NULL);
  941                 if (stcb == NULL) {
  942                         SCTP_INP_WLOCK(inp);
  943                         SCTP_INP_DECR_REF(inp);
  944                         SCTP_INP_WUNLOCK(inp);
  945                 }
  946         }
  947 
  948         if (stcb != NULL) {
  949                 /* Already have or am bring up an association */
  950                 SCTP_ASOC_CREATE_UNLOCK(inp);
  951                 SCTP_TCB_UNLOCK(stcb);
  952                 SCTP_LTRACE_ERR_RET(inp, NULL, NULL, SCTP_FROM_SCTP6_USRREQ, EALREADY);
  953                 return (EALREADY);
  954         }
  955         /* We are GOOD to go */
  956         stcb = sctp_aloc_assoc(inp, addr, &error, 0, vrf_id, inp->sctp_ep.pre_open_stream_count, p);
  957         SCTP_ASOC_CREATE_UNLOCK(inp);
  958         if (stcb == NULL) {
  959                 /* Gak! no memory */
  960                 return (error);
  961         }
  962         if (stcb->sctp_ep->sctp_flags & SCTP_PCB_FLAGS_TCPTYPE) {
  963                 stcb->sctp_ep->sctp_flags |= SCTP_PCB_FLAGS_CONNECTED;
  964                 /* Set the connected flag so we can queue data */
  965                 soisconnecting(so);
  966         }
  967         stcb->asoc.state = SCTP_STATE_COOKIE_WAIT;
  968         (void)SCTP_GETTIME_TIMEVAL(&stcb->asoc.time_entered);
  969 
  970         /* initialize authentication parameters for the assoc */
  971         sctp_initialize_auth_params(inp, stcb);
  972 
  973         sctp_send_initiate(inp, stcb, SCTP_SO_LOCKED);
  974         SCTP_TCB_UNLOCK(stcb);
  975         return (error);
  976 }
  977 
  978 static int
  979 sctp6_getaddr(struct socket *so, struct sockaddr **addr)
  980 {
  981         struct sockaddr_in6 *sin6;
  982         struct sctp_inpcb *inp;
  983         uint32_t vrf_id;
  984         struct sctp_ifa *sctp_ifa;
  985 
  986         int error;
  987 
  988         /*
  989          * Do the malloc first in case it blocks.
  990          */
  991         SCTP_MALLOC_SONAME(sin6, struct sockaddr_in6 *, sizeof(*sin6));
  992         if (sin6 == NULL)
  993                 return (ENOMEM);
  994         sin6->sin6_family = AF_INET6;
  995         sin6->sin6_len = sizeof(*sin6);
  996 
  997         inp = (struct sctp_inpcb *)so->so_pcb;
  998         if (inp == NULL) {
  999                 SCTP_FREE_SONAME(sin6);
 1000                 SCTP_LTRACE_ERR_RET(inp, NULL, NULL, SCTP_FROM_SCTP6_USRREQ, ECONNRESET);
 1001                 return (ECONNRESET);
 1002         }
 1003         SCTP_INP_RLOCK(inp);
 1004         sin6->sin6_port = inp->sctp_lport;
 1005         if (inp->sctp_flags & SCTP_PCB_FLAGS_BOUNDALL) {
 1006                 /* For the bound all case you get back 0 */
 1007                 if (inp->sctp_flags & SCTP_PCB_FLAGS_CONNECTED) {
 1008                         struct sctp_tcb *stcb;
 1009                         struct sockaddr_in6 *sin_a6;
 1010                         struct sctp_nets *net;
 1011                         int fnd;
 1012 
 1013                         stcb = LIST_FIRST(&inp->sctp_asoc_list);
 1014                         if (stcb == NULL) {
 1015                                 SCTP_INP_RUNLOCK(inp);
 1016                                 SCTP_FREE_SONAME(sin6);
 1017                                 SCTP_LTRACE_ERR_RET(inp, NULL, NULL, SCTP_FROM_SCTP6_USRREQ, ENOENT);
 1018                                 return (ENOENT);
 1019                         }
 1020                         fnd = 0;
 1021                         sin_a6 = NULL;
 1022                         TAILQ_FOREACH(net, &stcb->asoc.nets, sctp_next) {
 1023                                 sin_a6 = (struct sockaddr_in6 *)&net->ro._l_addr;
 1024                                 if (sin_a6 == NULL)
 1025                                         /* this will make coverity happy */
 1026                                         continue;
 1027 
 1028                                 if (sin_a6->sin6_family == AF_INET6) {
 1029                                         fnd = 1;
 1030                                         break;
 1031                                 }
 1032                         }
 1033                         if ((!fnd) || (sin_a6 == NULL)) {
 1034                                 /* punt */
 1035                                 SCTP_INP_RUNLOCK(inp);
 1036                                 SCTP_FREE_SONAME(sin6);
 1037                                 SCTP_LTRACE_ERR_RET(inp, NULL, NULL, SCTP_FROM_SCTP6_USRREQ, ENOENT);
 1038                                 return (ENOENT);
 1039                         }
 1040                         vrf_id = inp->def_vrf_id;
 1041                         sctp_ifa = sctp_source_address_selection(inp, stcb, (sctp_route_t *) & net->ro, net, 0, vrf_id);
 1042                         if (sctp_ifa) {
 1043                                 sin6->sin6_addr = sctp_ifa->address.sin6.sin6_addr;
 1044                         }
 1045                 } else {
 1046                         /* For the bound all case you get back 0 */
 1047                         memset(&sin6->sin6_addr, 0, sizeof(sin6->sin6_addr));
 1048                 }
 1049         } else {
 1050                 /* Take the first IPv6 address in the list */
 1051                 struct sctp_laddr *laddr;
 1052                 int fnd = 0;
 1053 
 1054                 LIST_FOREACH(laddr, &inp->sctp_addr_list, sctp_nxt_addr) {
 1055                         if (laddr->ifa->address.sa.sa_family == AF_INET6) {
 1056                                 struct sockaddr_in6 *sin_a;
 1057 
 1058                                 sin_a = &laddr->ifa->address.sin6;
 1059                                 sin6->sin6_addr = sin_a->sin6_addr;
 1060                                 fnd = 1;
 1061                                 break;
 1062                         }
 1063                 }
 1064                 if (!fnd) {
 1065                         SCTP_FREE_SONAME(sin6);
 1066                         SCTP_INP_RUNLOCK(inp);
 1067                         SCTP_LTRACE_ERR_RET(inp, NULL, NULL, SCTP_FROM_SCTP6_USRREQ, ENOENT);
 1068                         return (ENOENT);
 1069                 }
 1070         }
 1071         SCTP_INP_RUNLOCK(inp);
 1072         /* Scoping things for v6 */
 1073         if ((error = sa6_recoverscope(sin6)) != 0) {
 1074                 SCTP_FREE_SONAME(sin6);
 1075                 return (error);
 1076         }
 1077         (*addr) = (struct sockaddr *)sin6;
 1078         return (0);
 1079 }
 1080 
 1081 static int
 1082 sctp6_peeraddr(struct socket *so, struct sockaddr **addr)
 1083 {
 1084         struct sockaddr_in6 *sin6;
 1085         int fnd;
 1086         struct sockaddr_in6 *sin_a6;
 1087         struct sctp_inpcb *inp;
 1088         struct sctp_tcb *stcb;
 1089         struct sctp_nets *net;
 1090         int error;
 1091 
 1092         /* Do the malloc first in case it blocks. */
 1093         SCTP_MALLOC_SONAME(sin6, struct sockaddr_in6 *, sizeof *sin6);
 1094         if (sin6 == NULL)
 1095                 return (ENOMEM);
 1096         sin6->sin6_family = AF_INET6;
 1097         sin6->sin6_len = sizeof(*sin6);
 1098 
 1099         inp = (struct sctp_inpcb *)so->so_pcb;
 1100         if ((inp == NULL) ||
 1101             ((inp->sctp_flags & SCTP_PCB_FLAGS_CONNECTED) == 0)) {
 1102                 /* UDP type and listeners will drop out here */
 1103                 SCTP_FREE_SONAME(sin6);
 1104                 SCTP_LTRACE_ERR_RET(inp, NULL, NULL, SCTP_FROM_SCTP6_USRREQ, ENOTCONN);
 1105                 return (ENOTCONN);
 1106         }
 1107         SCTP_INP_RLOCK(inp);
 1108         stcb = LIST_FIRST(&inp->sctp_asoc_list);
 1109         if (stcb) {
 1110                 SCTP_TCB_LOCK(stcb);
 1111         }
 1112         SCTP_INP_RUNLOCK(inp);
 1113         if (stcb == NULL) {
 1114                 SCTP_FREE_SONAME(sin6);
 1115                 SCTP_LTRACE_ERR_RET(inp, NULL, NULL, SCTP_FROM_SCTP6_USRREQ, ECONNRESET);
 1116                 return (ECONNRESET);
 1117         }
 1118         fnd = 0;
 1119         TAILQ_FOREACH(net, &stcb->asoc.nets, sctp_next) {
 1120                 sin_a6 = (struct sockaddr_in6 *)&net->ro._l_addr;
 1121                 if (sin_a6->sin6_family == AF_INET6) {
 1122                         fnd = 1;
 1123                         sin6->sin6_port = stcb->rport;
 1124                         sin6->sin6_addr = sin_a6->sin6_addr;
 1125                         break;
 1126                 }
 1127         }
 1128         SCTP_TCB_UNLOCK(stcb);
 1129         if (!fnd) {
 1130                 /* No IPv4 address */
 1131                 SCTP_FREE_SONAME(sin6);
 1132                 SCTP_LTRACE_ERR_RET(inp, NULL, NULL, SCTP_FROM_SCTP6_USRREQ, ENOENT);
 1133                 return (ENOENT);
 1134         }
 1135         if ((error = sa6_recoverscope(sin6)) != 0) {
 1136                 SCTP_FREE_SONAME(sin6);
 1137                 SCTP_LTRACE_ERR_RET(inp, NULL, NULL, SCTP_FROM_SCTP6_USRREQ, error);
 1138                 return (error);
 1139         }
 1140         *addr = (struct sockaddr *)sin6;
 1141         return (0);
 1142 }
 1143 
 1144 static int
 1145 sctp6_in6getaddr(struct socket *so, struct sockaddr **nam)
 1146 {
 1147         struct in6pcb *inp6 = sotoin6pcb(so);
 1148         int error;
 1149 
 1150         if (inp6 == NULL) {
 1151                 SCTP_LTRACE_ERR_RET(NULL, NULL, NULL, SCTP_FROM_SCTP6_USRREQ, EINVAL);
 1152                 return (EINVAL);
 1153         }
 1154         /* allow v6 addresses precedence */
 1155         error = sctp6_getaddr(so, nam);
 1156 #ifdef INET
 1157         if (error) {
 1158                 struct sockaddr_in6 *sin6;
 1159 
 1160                 /* try v4 next if v6 failed */
 1161                 error = sctp_ingetaddr(so, nam);
 1162                 if (error) {
 1163                         return (error);
 1164                 }
 1165                 SCTP_MALLOC_SONAME(sin6, struct sockaddr_in6 *, sizeof *sin6);
 1166                 if (sin6 == NULL) {
 1167                         SCTP_FREE_SONAME(*nam);
 1168                         return (ENOMEM);
 1169                 }
 1170                 in6_sin_2_v4mapsin6((struct sockaddr_in *)*nam, sin6);
 1171                 SCTP_FREE_SONAME(*nam);
 1172                 *nam = (struct sockaddr *)sin6;
 1173         }
 1174 #endif
 1175         return (error);
 1176 }
 1177 
 1178 
 1179 static int
 1180 sctp6_getpeeraddr(struct socket *so, struct sockaddr **nam)
 1181 {
 1182         struct in6pcb *inp6 = sotoin6pcb(so);
 1183         int error;
 1184 
 1185         if (inp6 == NULL) {
 1186                 SCTP_LTRACE_ERR_RET(NULL, NULL, NULL, SCTP_FROM_SCTP6_USRREQ, EINVAL);
 1187                 return (EINVAL);
 1188         }
 1189         /* allow v6 addresses precedence */
 1190         error = sctp6_peeraddr(so, nam);
 1191 #ifdef INET
 1192         if (error) {
 1193                 struct sockaddr_in6 *sin6;
 1194 
 1195                 /* try v4 next if v6 failed */
 1196                 error = sctp_peeraddr(so, nam);
 1197                 if (error) {
 1198                         return (error);
 1199                 }
 1200                 SCTP_MALLOC_SONAME(sin6, struct sockaddr_in6 *, sizeof *sin6);
 1201                 if (sin6 == NULL) {
 1202                         SCTP_FREE_SONAME(*nam);
 1203                         return (ENOMEM);
 1204                 }
 1205                 in6_sin_2_v4mapsin6((struct sockaddr_in *)*nam, sin6);
 1206                 SCTP_FREE_SONAME(*nam);
 1207                 *nam = (struct sockaddr *)sin6;
 1208         }
 1209 #endif
 1210         return (error);
 1211 }
 1212 
 1213 struct pr_usrreqs sctp6_usrreqs = {
 1214         .pru_abort = sctp6_abort,
 1215         .pru_accept = sctp_accept,
 1216         .pru_attach = sctp6_attach,
 1217         .pru_bind = sctp6_bind,
 1218         .pru_connect = sctp6_connect,
 1219         .pru_control = in6_control,
 1220         .pru_close = sctp6_close,
 1221         .pru_detach = sctp6_close,
 1222         .pru_sopoll = sopoll_generic,
 1223         .pru_flush = sctp_flush,
 1224         .pru_disconnect = sctp6_disconnect,
 1225         .pru_listen = sctp_listen,
 1226         .pru_peeraddr = sctp6_getpeeraddr,
 1227         .pru_send = sctp6_send,
 1228         .pru_shutdown = sctp_shutdown,
 1229         .pru_sockaddr = sctp6_in6getaddr,
 1230         .pru_sosend = sctp_sosend,
 1231         .pru_soreceive = sctp_soreceive
 1232 };
 1233 
 1234 #endif
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FreeBSD/Linux Kernel Cross Reference sys/netinet6/sctp6_usrreq.c

FreeBSD/Linux Kernel Cross Reference
sys/netinet6/sctp6_usrreq.c
