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/10.1/sys/netinet6/sctp6_usrreq.c 293894 2016-01-14 09:11:16Z glebius $");
   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 #ifdef INET6
   43 #include <netinet6/sctp6_var.h>
   44 #endif
   45 #include <netinet/sctp_sysctl.h>
   46 #include <netinet/sctp_output.h>
   47 #include <netinet/sctp_uio.h>
   48 #include <netinet/sctp_asconf.h>
   49 #include <netinet/sctputil.h>
   50 #include <netinet/sctp_indata.h>
   51 #include <netinet/sctp_timer.h>
   52 #include <netinet/sctp_auth.h>
   53 #include <netinet/sctp_input.h>
   54 #include <netinet/sctp_output.h>
   55 #include <netinet/sctp_bsd_addr.h>
   56 #include <netinet/sctp_crc32.h>
   57 #include <netinet/udp.h>
   58 
   59 #ifdef IPSEC
   60 #include <netipsec/ipsec.h>
   61 #ifdef INET6
   62 #include <netipsec/ipsec6.h>
   63 #endif                          /* INET6 */
   64 #endif                          /* IPSEC */
   65 
   66 extern struct protosw inetsw[];
   67 
   68 int
   69 sctp6_input_with_port(struct mbuf **i_pak, int *offp, uint16_t port)
   70 {
   71         struct mbuf *m;
   72         int iphlen;
   73         uint32_t vrf_id;
   74         uint8_t ecn_bits;
   75         struct sockaddr_in6 src, dst;
   76         struct ip6_hdr *ip6;
   77         struct sctphdr *sh;
   78         struct sctp_chunkhdr *ch;
   79         int length, offset;
   80 
   81 #if !defined(SCTP_WITH_NO_CSUM)
   82         uint8_t compute_crc;
   83 
   84 #endif
   85         uint32_t mflowid;
   86         uint8_t use_mflowid;
   87 
   88         iphlen = *offp;
   89         if (SCTP_GET_PKT_VRFID(*i_pak, vrf_id)) {
   90                 SCTP_RELEASE_PKT(*i_pak);
   91                 return (IPPROTO_DONE);
   92         }
   93         m = SCTP_HEADER_TO_CHAIN(*i_pak);
   94 #ifdef SCTP_MBUF_LOGGING
   95         /* Log in any input mbufs */
   96         if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_MBUF_LOGGING_ENABLE) {
   97                 struct mbuf *mat;
   98 
   99                 for (mat = m; mat; mat = SCTP_BUF_NEXT(mat)) {
  100                         if (SCTP_BUF_IS_EXTENDED(mat)) {
  101                                 sctp_log_mb(mat, SCTP_MBUF_INPUT);
  102                         }
  103                 }
  104         }
  105 #endif
  106 #ifdef SCTP_PACKET_LOGGING
  107         if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_LAST_PACKET_TRACING) {
  108                 sctp_packet_log(m);
  109         }
  110 #endif
  111         SCTPDBG(SCTP_DEBUG_CRCOFFLOAD,
  112             "sctp6_input(): Packet of length %d received on %s with csum_flags 0x%b.\n",
  113             m->m_pkthdr.len,
  114             if_name(m->m_pkthdr.rcvif),
  115             (int)m->m_pkthdr.csum_flags, CSUM_BITS);
  116         if (m->m_flags & M_FLOWID) {
  117                 mflowid = m->m_pkthdr.flowid;
  118                 use_mflowid = 1;
  119         } else {
  120                 mflowid = 0;
  121                 use_mflowid = 0;
  122         }
  123         SCTP_STAT_INCR(sctps_recvpackets);
  124         SCTP_STAT_INCR_COUNTER64(sctps_inpackets);
  125         /* Get IP, SCTP, and first chunk header together in the first mbuf. */
  126         offset = iphlen + sizeof(struct sctphdr) + sizeof(struct sctp_chunkhdr);
  127         ip6 = mtod(m, struct ip6_hdr *);
  128         IP6_EXTHDR_GET(sh, struct sctphdr *, m, iphlen,
  129             (int)(sizeof(struct sctphdr) + sizeof(struct sctp_chunkhdr)));
  130         if (sh == NULL) {
  131                 SCTP_STAT_INCR(sctps_hdrops);
  132                 return (IPPROTO_DONE);
  133         }
  134         ch = (struct sctp_chunkhdr *)((caddr_t)sh + sizeof(struct sctphdr));
  135         offset -= sizeof(struct sctp_chunkhdr);
  136         memset(&src, 0, sizeof(struct sockaddr_in6));
  137         src.sin6_family = AF_INET6;
  138         src.sin6_len = sizeof(struct sockaddr_in6);
  139         src.sin6_port = sh->src_port;
  140         src.sin6_addr = ip6->ip6_src;
  141         if (in6_setscope(&src.sin6_addr, m->m_pkthdr.rcvif, NULL) != 0) {
  142                 goto out;
  143         }
  144         memset(&dst, 0, sizeof(struct sockaddr_in6));
  145         dst.sin6_family = AF_INET6;
  146         dst.sin6_len = sizeof(struct sockaddr_in6);
  147         dst.sin6_port = sh->dest_port;
  148         dst.sin6_addr = ip6->ip6_dst;
  149         if (in6_setscope(&dst.sin6_addr, m->m_pkthdr.rcvif, NULL) != 0) {
  150                 goto out;
  151         }
  152         if (faithprefix_p != NULL && (*faithprefix_p) (&dst.sin6_addr)) {
  153                 /* XXX send icmp6 host/port unreach? */
  154                 goto out;
  155         }
  156         length = ntohs(ip6->ip6_plen) + iphlen;
  157         /* Validate mbuf chain length with IP payload length. */
  158         if (SCTP_HEADER_LEN(m) != length) {
  159                 SCTPDBG(SCTP_DEBUG_INPUT1,
  160                     "sctp6_input() length:%d reported length:%d\n", length, SCTP_HEADER_LEN(m));
  161                 SCTP_STAT_INCR(sctps_hdrops);
  162                 goto out;
  163         }
  164         if (IN6_IS_ADDR_MULTICAST(&ip6->ip6_dst)) {
  165                 goto out;
  166         }
  167         ecn_bits = ((ntohl(ip6->ip6_flow) >> 20) & 0x000000ff);
  168 #if defined(SCTP_WITH_NO_CSUM)
  169         SCTP_STAT_INCR(sctps_recvnocrc);
  170 #else
  171         if (m->m_pkthdr.csum_flags & CSUM_SCTP_VALID) {
  172                 SCTP_STAT_INCR(sctps_recvhwcrc);
  173                 compute_crc = 0;
  174         } else {
  175                 SCTP_STAT_INCR(sctps_recvswcrc);
  176                 compute_crc = 1;
  177         }
  178 #endif
  179         sctp_common_input_processing(&m, iphlen, offset, length,
  180             (struct sockaddr *)&src,
  181             (struct sockaddr *)&dst,
  182             sh, ch,
  183 #if !defined(SCTP_WITH_NO_CSUM)
  184             compute_crc,
  185 #endif
  186             ecn_bits,
  187             use_mflowid, mflowid,
  188             vrf_id, port);
  189 out:
  190         if (m) {
  191                 sctp_m_freem(m);
  192         }
  193         return (IPPROTO_DONE);
  194 }
  195 
  196 
  197 int
  198 sctp6_input(struct mbuf **i_pak, int *offp, int proto SCTP_UNUSED)
  199 {
  200         return (sctp6_input_with_port(i_pak, offp, 0));
  201 }
  202 
  203 static void
  204 sctp6_notify_mbuf(struct sctp_inpcb *inp, struct icmp6_hdr *icmp6,
  205     struct sctphdr *sh, struct sctp_tcb *stcb, struct sctp_nets *net)
  206 {
  207         uint32_t nxtsz;
  208 
  209         if ((inp == NULL) || (stcb == NULL) || (net == NULL) ||
  210             (icmp6 == NULL) || (sh == NULL)) {
  211                 goto out;
  212         }
  213         /* First do we even look at it? */
  214         if (ntohl(sh->v_tag) != (stcb->asoc.peer_vtag))
  215                 goto out;
  216 
  217         if (icmp6->icmp6_type != ICMP6_PACKET_TOO_BIG) {
  218                 /* not PACKET TO BIG */
  219                 goto out;
  220         }
  221         /*
  222          * ok we need to look closely. We could even get smarter and look at
  223          * anyone that we sent to in case we get a different ICMP that tells
  224          * us there is no way to reach a host, but for this impl, all we
  225          * care about is MTU discovery.
  226          */
  227         nxtsz = ntohl(icmp6->icmp6_mtu);
  228         /* Stop any PMTU timer */
  229         sctp_timer_stop(SCTP_TIMER_TYPE_PATHMTURAISE, inp, stcb, NULL, SCTP_FROM_SCTP6_USRREQ + SCTP_LOC_1);
  230 
  231         /* Adjust destination size limit */
  232         if (net->mtu > nxtsz) {
  233                 net->mtu = nxtsz;
  234                 if (net->port) {
  235                         net->mtu -= sizeof(struct udphdr);
  236                 }
  237         }
  238         /* now what about the ep? */
  239         if (stcb->asoc.smallest_mtu > nxtsz) {
  240                 struct sctp_tmit_chunk *chk;
  241 
  242                 /* Adjust that too */
  243                 stcb->asoc.smallest_mtu = nxtsz;
  244                 /* now off to subtract IP_DF flag if needed */
  245 
  246                 TAILQ_FOREACH(chk, &stcb->asoc.send_queue, sctp_next) {
  247                         if ((uint32_t) (chk->send_size + IP_HDR_SIZE) > nxtsz) {
  248                                 chk->flags |= CHUNK_FLAGS_FRAGMENT_OK;
  249                         }
  250                 }
  251                 TAILQ_FOREACH(chk, &stcb->asoc.sent_queue, sctp_next) {
  252                         if ((uint32_t) (chk->send_size + IP_HDR_SIZE) > nxtsz) {
  253                                 /*
  254                                  * For this guy we also mark for immediate
  255                                  * resend since we sent to big of chunk
  256                                  */
  257                                 chk->flags |= CHUNK_FLAGS_FRAGMENT_OK;
  258                                 if (chk->sent != SCTP_DATAGRAM_RESEND)
  259                                         stcb->asoc.sent_queue_retran_cnt++;
  260                                 chk->sent = SCTP_DATAGRAM_RESEND;
  261                                 chk->rec.data.doing_fast_retransmit = 0;
  262 
  263                                 chk->sent = SCTP_DATAGRAM_RESEND;
  264                                 /* Clear any time so NO RTT is being done */
  265                                 chk->sent_rcv_time.tv_sec = 0;
  266                                 chk->sent_rcv_time.tv_usec = 0;
  267                                 stcb->asoc.total_flight -= chk->send_size;
  268                                 net->flight_size -= chk->send_size;
  269                         }
  270                 }
  271         }
  272         sctp_timer_start(SCTP_TIMER_TYPE_PATHMTURAISE, inp, stcb, NULL);
  273 out:
  274         if (stcb) {
  275                 SCTP_TCB_UNLOCK(stcb);
  276         }
  277 }
  278 
  279 
  280 void
  281 sctp6_notify(struct sctp_inpcb *inp,
  282     struct icmp6_hdr *icmph,
  283     struct sctphdr *sh,
  284     struct sockaddr *to,
  285     struct sctp_tcb *stcb,
  286     struct sctp_nets *net)
  287 {
  288 #if defined(__APPLE__) || defined(SCTP_SO_LOCK_TESTING)
  289         struct socket *so;
  290 
  291 #endif
  292 
  293         /* protection */
  294         if ((inp == NULL) || (stcb == NULL) || (net == NULL) ||
  295             (sh == NULL) || (to == NULL)) {
  296                 if (stcb)
  297                         SCTP_TCB_UNLOCK(stcb);
  298                 return;
  299         }
  300         /* First job is to verify the vtag matches what I would send */
  301         if (ntohl(sh->v_tag) != (stcb->asoc.peer_vtag)) {
  302                 SCTP_TCB_UNLOCK(stcb);
  303                 return;
  304         }
  305         if (icmph->icmp6_type != ICMP_UNREACH) {
  306                 /* We only care about unreachable */
  307                 SCTP_TCB_UNLOCK(stcb);
  308                 return;
  309         }
  310         if ((icmph->icmp6_code == ICMP_UNREACH_NET) ||
  311             (icmph->icmp6_code == ICMP_UNREACH_HOST) ||
  312             (icmph->icmp6_code == ICMP_UNREACH_NET_UNKNOWN) ||
  313             (icmph->icmp6_code == ICMP_UNREACH_HOST_UNKNOWN) ||
  314             (icmph->icmp6_code == ICMP_UNREACH_ISOLATED) ||
  315             (icmph->icmp6_code == ICMP_UNREACH_NET_PROHIB) ||
  316             (icmph->icmp6_code == ICMP_UNREACH_HOST_PROHIB) ||
  317             (icmph->icmp6_code == ICMP_UNREACH_FILTER_PROHIB)) {
  318 
  319                 /*
  320                  * Hmm reachablity problems we must examine closely. If its
  321                  * not reachable, we may have lost a network. Or if there is
  322                  * NO protocol at the other end named SCTP. well we consider
  323                  * it a OOTB abort.
  324                  */
  325                 if (net->dest_state & SCTP_ADDR_REACHABLE) {
  326                         /* Ok that destination is NOT reachable */
  327                         net->dest_state &= ~SCTP_ADDR_REACHABLE;
  328                         net->dest_state &= ~SCTP_ADDR_PF;
  329                         sctp_ulp_notify(SCTP_NOTIFY_INTERFACE_DOWN,
  330                             stcb, 0, (void *)net, SCTP_SO_NOT_LOCKED);
  331                 }
  332                 SCTP_TCB_UNLOCK(stcb);
  333         } else if ((icmph->icmp6_code == ICMP_UNREACH_PROTOCOL) ||
  334             (icmph->icmp6_code == ICMP_UNREACH_PORT)) {
  335                 /*
  336                  * Here the peer is either playing tricks on us, including
  337                  * an address that belongs to someone who does not support
  338                  * SCTP OR was a userland implementation that shutdown and
  339                  * now is dead. In either case treat it like a OOTB abort
  340                  * with no TCB
  341                  */
  342                 sctp_abort_notification(stcb, 1, 0, NULL, SCTP_SO_NOT_LOCKED);
  343 #if defined(__APPLE__) || defined(SCTP_SO_LOCK_TESTING)
  344                 so = SCTP_INP_SO(inp);
  345                 atomic_add_int(&stcb->asoc.refcnt, 1);
  346                 SCTP_TCB_UNLOCK(stcb);
  347                 SCTP_SOCKET_LOCK(so, 1);
  348                 SCTP_TCB_LOCK(stcb);
  349                 atomic_subtract_int(&stcb->asoc.refcnt, 1);
  350 #endif
  351                 (void)sctp_free_assoc(inp, stcb, SCTP_NORMAL_PROC, SCTP_FROM_SCTP_USRREQ + SCTP_LOC_2);
  352 #if defined(__APPLE__) || defined(SCTP_SO_LOCK_TESTING)
  353                 SCTP_SOCKET_UNLOCK(so, 1);
  354                 /* SCTP_TCB_UNLOCK(stcb); MT: I think this is not needed. */
  355 #endif
  356                 /* no need to unlock here, since the TCB is gone */
  357         } else {
  358                 SCTP_TCB_UNLOCK(stcb);
  359         }
  360 }
  361 
  362 
  363 
  364 void
  365 sctp6_ctlinput(int cmd, struct sockaddr *pktdst, void *d)
  366 {
  367         struct sctphdr sh;
  368         struct ip6ctlparam *ip6cp = NULL;
  369         uint32_t vrf_id;
  370 
  371         vrf_id = SCTP_DEFAULT_VRFID;
  372 
  373         if (pktdst->sa_family != AF_INET6 ||
  374             pktdst->sa_len != sizeof(struct sockaddr_in6))
  375                 return;
  376 
  377         if ((unsigned)cmd >= PRC_NCMDS)
  378                 return;
  379         if (PRC_IS_REDIRECT(cmd)) {
  380                 d = NULL;
  381         } else if (inet6ctlerrmap[cmd] == 0) {
  382                 return;
  383         }
  384         /* if the parameter is from icmp6, decode it. */
  385         if (d != NULL) {
  386                 ip6cp = (struct ip6ctlparam *)d;
  387         } else {
  388                 ip6cp = (struct ip6ctlparam *)NULL;
  389         }
  390 
  391         if (ip6cp) {
  392                 /*
  393                  * XXX: We assume that when IPV6 is non NULL, M and OFF are
  394                  * valid.
  395                  */
  396                 struct sctp_inpcb *inp = NULL;
  397                 struct sctp_tcb *stcb = NULL;
  398                 struct sctp_nets *net = NULL;
  399                 struct sockaddr_in6 final;
  400 
  401                 if (ip6cp->ip6c_m == NULL)
  402                         return;
  403 
  404                 /* Check if we can safely examine the SCTP header. */
  405                 if (ip6cp->ip6c_m->m_pkthdr.len < ip6cp->ip6c_off + sizeof(sh))
  406                         return;
  407 
  408                 bzero(&sh, sizeof(sh));
  409                 bzero(&final, sizeof(final));
  410                 inp = NULL;
  411                 net = NULL;
  412                 m_copydata(ip6cp->ip6c_m, ip6cp->ip6c_off, sizeof(sh),
  413                     (caddr_t)&sh);
  414                 ip6cp->ip6c_src->sin6_port = sh.src_port;
  415                 final.sin6_len = sizeof(final);
  416                 final.sin6_family = AF_INET6;
  417                 final.sin6_addr = ((struct sockaddr_in6 *)pktdst)->sin6_addr;
  418                 final.sin6_port = sh.dest_port;
  419                 stcb = sctp_findassociation_addr_sa((struct sockaddr *)&final,
  420                     (struct sockaddr *)ip6cp->ip6c_src,
  421                     &inp, &net, 1, vrf_id);
  422                 /* inp's ref-count increased && stcb locked */
  423                 if (stcb != NULL && inp && (inp->sctp_socket != NULL)) {
  424                         if (cmd == PRC_MSGSIZE) {
  425                                 sctp6_notify_mbuf(inp,
  426                                     ip6cp->ip6c_icmp6,
  427                                     &sh,
  428                                     stcb,
  429                                     net);
  430                                 /* inp's ref-count reduced && stcb unlocked */
  431                         } else {
  432                                 sctp6_notify(inp, ip6cp->ip6c_icmp6, &sh,
  433                                     (struct sockaddr *)&final,
  434                                     stcb, net);
  435                                 /* inp's ref-count reduced && stcb unlocked */
  436                         }
  437                 } else {
  438                         if (PRC_IS_REDIRECT(cmd) && inp) {
  439                                 in6_rtchange((struct in6pcb *)inp,
  440                                     inet6ctlerrmap[cmd]);
  441                         }
  442                         if (inp) {
  443                                 /* reduce inp's ref-count */
  444                                 SCTP_INP_WLOCK(inp);
  445                                 SCTP_INP_DECR_REF(inp);
  446                                 SCTP_INP_WUNLOCK(inp);
  447                         }
  448                         if (stcb)
  449                                 SCTP_TCB_UNLOCK(stcb);
  450                 }
  451         }
  452 }
  453 
  454 /*
  455  * this routine can probably be collasped into the one in sctp_userreq.c
  456  * since they do the same thing and now we lookup with a sockaddr
  457  */
  458 static int
  459 sctp6_getcred(SYSCTL_HANDLER_ARGS)
  460 {
  461         struct xucred xuc;
  462         struct sockaddr_in6 addrs[2];
  463         struct sctp_inpcb *inp;
  464         struct sctp_nets *net;
  465         struct sctp_tcb *stcb;
  466         int error;
  467         uint32_t vrf_id;
  468 
  469         vrf_id = SCTP_DEFAULT_VRFID;
  470 
  471         error = priv_check(req->td, PRIV_NETINET_GETCRED);
  472         if (error)
  473                 return (error);
  474 
  475         if (req->newlen != sizeof(addrs)) {
  476                 SCTP_LTRACE_ERR_RET(NULL, NULL, NULL, SCTP_FROM_SCTP6_USRREQ, EINVAL);
  477                 return (EINVAL);
  478         }
  479         if (req->oldlen != sizeof(struct ucred)) {
  480                 SCTP_LTRACE_ERR_RET(NULL, NULL, NULL, SCTP_FROM_SCTP6_USRREQ, EINVAL);
  481                 return (EINVAL);
  482         }
  483         error = SYSCTL_IN(req, addrs, sizeof(addrs));
  484         if (error)
  485                 return (error);
  486 
  487         stcb = sctp_findassociation_addr_sa(sin6tosa(&addrs[1]),
  488             sin6tosa(&addrs[0]),
  489             &inp, &net, 1, vrf_id);
  490         if (stcb == NULL || inp == NULL || inp->sctp_socket == NULL) {
  491                 if ((inp != NULL) && (stcb == NULL)) {
  492                         /* reduce ref-count */
  493                         SCTP_INP_WLOCK(inp);
  494                         SCTP_INP_DECR_REF(inp);
  495                         goto cred_can_cont;
  496                 }
  497                 SCTP_LTRACE_ERR_RET(inp, NULL, NULL, SCTP_FROM_SCTP6_USRREQ, ENOENT);
  498                 error = ENOENT;
  499                 goto out;
  500         }
  501         SCTP_TCB_UNLOCK(stcb);
  502         /*
  503          * We use the write lock here, only since in the error leg we need
  504          * it. If we used RLOCK, then we would have to
  505          * wlock/decr/unlock/rlock. Which in theory could create a hole.
  506          * Better to use higher wlock.
  507          */
  508         SCTP_INP_WLOCK(inp);
  509 cred_can_cont:
  510         error = cr_canseesocket(req->td->td_ucred, inp->sctp_socket);
  511         if (error) {
  512                 SCTP_INP_WUNLOCK(inp);
  513                 goto out;
  514         }
  515         cru2x(inp->sctp_socket->so_cred, &xuc);
  516         SCTP_INP_WUNLOCK(inp);
  517         error = SYSCTL_OUT(req, &xuc, sizeof(struct xucred));
  518 out:
  519         return (error);
  520 }
  521 
  522 SYSCTL_PROC(_net_inet6_sctp6, OID_AUTO, getcred, CTLTYPE_OPAQUE | CTLFLAG_RW,
  523     0, 0,
  524     sctp6_getcred, "S,ucred", "Get the ucred of a SCTP6 connection");
  525 
  526 
  527 /* This is the same as the sctp_abort() could be made common */
  528 static void
  529 sctp6_abort(struct socket *so)
  530 {
  531         struct sctp_inpcb *inp;
  532         uint32_t flags;
  533 
  534         inp = (struct sctp_inpcb *)so->so_pcb;
  535         if (inp == NULL) {
  536                 SCTP_LTRACE_ERR_RET(inp, NULL, NULL, SCTP_FROM_SCTP6_USRREQ, EINVAL);
  537                 return;
  538         }
  539 sctp_must_try_again:
  540         flags = inp->sctp_flags;
  541 #ifdef SCTP_LOG_CLOSING
  542         sctp_log_closing(inp, NULL, 17);
  543 #endif
  544         if (((flags & SCTP_PCB_FLAGS_SOCKET_GONE) == 0) &&
  545             (atomic_cmpset_int(&inp->sctp_flags, flags, (flags | SCTP_PCB_FLAGS_SOCKET_GONE | SCTP_PCB_FLAGS_CLOSE_IP)))) {
  546 #ifdef SCTP_LOG_CLOSING
  547                 sctp_log_closing(inp, NULL, 16);
  548 #endif
  549                 sctp_inpcb_free(inp, SCTP_FREE_SHOULD_USE_ABORT,
  550                     SCTP_CALLED_AFTER_CMPSET_OFCLOSE);
  551                 SOCK_LOCK(so);
  552                 SCTP_SB_CLEAR(so->so_snd);
  553                 /*
  554                  * same for the rcv ones, they are only here for the
  555                  * accounting/select.
  556                  */
  557                 SCTP_SB_CLEAR(so->so_rcv);
  558                 /* Now null out the reference, we are completely detached. */
  559                 so->so_pcb = NULL;
  560                 SOCK_UNLOCK(so);
  561         } else {
  562                 flags = inp->sctp_flags;
  563                 if ((flags & SCTP_PCB_FLAGS_SOCKET_GONE) == 0) {
  564                         goto sctp_must_try_again;
  565                 }
  566         }
  567         return;
  568 }
  569 
  570 static int
  571 sctp6_attach(struct socket *so, int proto SCTP_UNUSED, struct thread *p SCTP_UNUSED)
  572 {
  573         struct in6pcb *inp6;
  574         int error;
  575         struct sctp_inpcb *inp;
  576         uint32_t vrf_id = SCTP_DEFAULT_VRFID;
  577 
  578         inp = (struct sctp_inpcb *)so->so_pcb;
  579         if (inp != NULL) {
  580                 SCTP_LTRACE_ERR_RET(inp, NULL, NULL, SCTP_FROM_SCTP6_USRREQ, EINVAL);
  581                 return (EINVAL);
  582         }
  583         if (so->so_snd.sb_hiwat == 0 || so->so_rcv.sb_hiwat == 0) {
  584                 error = SCTP_SORESERVE(so, SCTP_BASE_SYSCTL(sctp_sendspace), SCTP_BASE_SYSCTL(sctp_recvspace));
  585                 if (error)
  586                         return (error);
  587         }
  588         error = sctp_inpcb_alloc(so, vrf_id);
  589         if (error)
  590                 return (error);
  591         inp = (struct sctp_inpcb *)so->so_pcb;
  592         SCTP_INP_WLOCK(inp);
  593         inp->sctp_flags |= SCTP_PCB_FLAGS_BOUND_V6;     /* I'm v6! */
  594         inp6 = (struct in6pcb *)inp;
  595 
  596         inp6->inp_vflag |= INP_IPV6;
  597         inp6->in6p_hops = -1;   /* use kernel default */
  598         inp6->in6p_cksum = -1;  /* just to be sure */
  599 #ifdef INET
  600         /*
  601          * XXX: ugly!! IPv4 TTL initialization is necessary for an IPv6
  602          * socket as well, because the socket may be bound to an IPv6
  603          * wildcard address, which may match an IPv4-mapped IPv6 address.
  604          */
  605         inp6->inp_ip_ttl = MODULE_GLOBAL(ip_defttl);
  606 #endif
  607         /*
  608          * Hmm what about the IPSEC stuff that is missing here but in
  609          * sctp_attach()?
  610          */
  611         SCTP_INP_WUNLOCK(inp);
  612         return (0);
  613 }
  614 
  615 static int
  616 sctp6_bind(struct socket *so, struct sockaddr *addr, struct thread *p)
  617 {
  618         struct sctp_inpcb *inp;
  619         struct in6pcb *inp6;
  620         int error;
  621 
  622         inp = (struct sctp_inpcb *)so->so_pcb;
  623         if (inp == NULL) {
  624                 SCTP_LTRACE_ERR_RET(inp, NULL, NULL, SCTP_FROM_SCTP6_USRREQ, EINVAL);
  625                 return (EINVAL);
  626         }
  627         if (addr) {
  628                 switch (addr->sa_family) {
  629 #ifdef INET
  630                 case AF_INET:
  631                         if (addr->sa_len != sizeof(struct sockaddr_in)) {
  632                                 SCTP_LTRACE_ERR_RET(inp, NULL, NULL, SCTP_FROM_SCTP6_USRREQ, EINVAL);
  633                                 return (EINVAL);
  634                         }
  635                         break;
  636 #endif
  637 #ifdef INET6
  638                 case AF_INET6:
  639                         if (addr->sa_len != sizeof(struct sockaddr_in6)) {
  640                                 SCTP_LTRACE_ERR_RET(inp, NULL, NULL, SCTP_FROM_SCTP6_USRREQ, EINVAL);
  641                                 return (EINVAL);
  642                         }
  643                         break;
  644 #endif
  645                 default:
  646                         SCTP_LTRACE_ERR_RET(inp, NULL, NULL, SCTP_FROM_SCTP6_USRREQ, EINVAL);
  647                         return (EINVAL);
  648                 }
  649         }
  650         inp6 = (struct in6pcb *)inp;
  651         inp6->inp_vflag &= ~INP_IPV4;
  652         inp6->inp_vflag |= INP_IPV6;
  653         if ((addr != NULL) && (SCTP_IPV6_V6ONLY(inp6) == 0)) {
  654                 switch (addr->sa_family) {
  655 #ifdef INET
  656                 case AF_INET:
  657                         /* binding v4 addr to v6 socket, so reset flags */
  658                         inp6->inp_vflag |= INP_IPV4;
  659                         inp6->inp_vflag &= ~INP_IPV6;
  660                         break;
  661 #endif
  662 #ifdef INET6
  663                 case AF_INET6:
  664                         {
  665                                 struct sockaddr_in6 *sin6_p;
  666 
  667                                 sin6_p = (struct sockaddr_in6 *)addr;
  668 
  669                                 if (IN6_IS_ADDR_UNSPECIFIED(&sin6_p->sin6_addr)) {
  670                                         inp6->inp_vflag |= INP_IPV4;
  671                                 }
  672 #ifdef INET
  673                                 if (IN6_IS_ADDR_V4MAPPED(&sin6_p->sin6_addr)) {
  674                                         struct sockaddr_in sin;
  675 
  676                                         in6_sin6_2_sin(&sin, sin6_p);
  677                                         inp6->inp_vflag |= INP_IPV4;
  678                                         inp6->inp_vflag &= ~INP_IPV6;
  679                                         error = sctp_inpcb_bind(so, (struct sockaddr *)&sin, NULL, p);
  680                                         return (error);
  681                                 }
  682 #endif
  683                                 break;
  684                         }
  685 #endif
  686                 default:
  687                         break;
  688                 }
  689         } else if (addr != NULL) {
  690                 struct sockaddr_in6 *sin6_p;
  691 
  692                 /* IPV6_V6ONLY socket */
  693 #ifdef INET
  694                 if (addr->sa_family == AF_INET) {
  695                         /* can't bind v4 addr to v6 only socket! */
  696                         SCTP_LTRACE_ERR_RET(inp, NULL, NULL, SCTP_FROM_SCTP6_USRREQ, EINVAL);
  697                         return (EINVAL);
  698                 }
  699 #endif
  700                 sin6_p = (struct sockaddr_in6 *)addr;
  701 
  702                 if (IN6_IS_ADDR_V4MAPPED(&sin6_p->sin6_addr)) {
  703                         /* can't bind v4-mapped addrs either! */
  704                         /* NOTE: we don't support SIIT */
  705                         SCTP_LTRACE_ERR_RET(inp, NULL, NULL, SCTP_FROM_SCTP6_USRREQ, EINVAL);
  706                         return (EINVAL);
  707                 }
  708         }
  709         error = sctp_inpcb_bind(so, addr, NULL, p);
  710         return (error);
  711 }
  712 
  713 
  714 static void
  715 sctp6_close(struct socket *so)
  716 {
  717         sctp_close(so);
  718 }
  719 
  720 /* This could be made common with sctp_detach() since they are identical */
  721 
  722 static
  723 int
  724 sctp6_disconnect(struct socket *so)
  725 {
  726         return (sctp_disconnect(so));
  727 }
  728 
  729 
  730 int
  731 sctp_sendm(struct socket *so, int flags, struct mbuf *m, struct sockaddr *addr,
  732     struct mbuf *control, struct thread *p);
  733 
  734 
  735 static int
  736 sctp6_send(struct socket *so, int flags, struct mbuf *m, struct sockaddr *addr,
  737     struct mbuf *control, struct thread *p)
  738 {
  739         struct sctp_inpcb *inp;
  740         struct in6pcb *inp6;
  741 
  742 #ifdef INET
  743         struct sockaddr_in6 *sin6;
  744 
  745 #endif                          /* INET */
  746         /* No SPL needed since sctp_output does this */
  747 
  748         inp = (struct sctp_inpcb *)so->so_pcb;
  749         if (inp == NULL) {
  750                 if (control) {
  751                         SCTP_RELEASE_PKT(control);
  752                         control = NULL;
  753                 }
  754                 SCTP_RELEASE_PKT(m);
  755                 SCTP_LTRACE_ERR_RET(inp, NULL, NULL, SCTP_FROM_SCTP6_USRREQ, EINVAL);
  756                 return (EINVAL);
  757         }
  758         inp6 = (struct in6pcb *)inp;
  759         /*
  760          * For the TCP model we may get a NULL addr, if we are a connected
  761          * socket thats ok.
  762          */
  763         if ((inp->sctp_flags & SCTP_PCB_FLAGS_CONNECTED) &&
  764             (addr == NULL)) {
  765                 goto connected_type;
  766         }
  767         if (addr == NULL) {
  768                 SCTP_RELEASE_PKT(m);
  769                 if (control) {
  770                         SCTP_RELEASE_PKT(control);
  771                         control = NULL;
  772                 }
  773                 SCTP_LTRACE_ERR_RET(inp, NULL, NULL, SCTP_FROM_SCTP6_USRREQ, EDESTADDRREQ);
  774                 return (EDESTADDRREQ);
  775         }
  776 #ifdef INET
  777         sin6 = (struct sockaddr_in6 *)addr;
  778         if (SCTP_IPV6_V6ONLY(inp6)) {
  779                 /*
  780                  * if IPV6_V6ONLY flag, we discard datagrams destined to a
  781                  * v4 addr or v4-mapped addr
  782                  */
  783                 if (addr->sa_family == AF_INET) {
  784                         SCTP_LTRACE_ERR_RET(inp, NULL, NULL, SCTP_FROM_SCTP6_USRREQ, EINVAL);
  785                         return (EINVAL);
  786                 }
  787                 if (IN6_IS_ADDR_V4MAPPED(&sin6->sin6_addr)) {
  788                         SCTP_LTRACE_ERR_RET(inp, NULL, NULL, SCTP_FROM_SCTP6_USRREQ, EINVAL);
  789                         return (EINVAL);
  790                 }
  791         }
  792         if (IN6_IS_ADDR_V4MAPPED(&sin6->sin6_addr)) {
  793                 struct sockaddr_in sin;
  794 
  795                 /* convert v4-mapped into v4 addr and send */
  796                 in6_sin6_2_sin(&sin, sin6);
  797                 return (sctp_sendm(so, flags, m, (struct sockaddr *)&sin, control, p));
  798         }
  799 #endif                          /* INET */
  800 connected_type:
  801         /* now what about control */
  802         if (control) {
  803                 if (inp->control) {
  804                         SCTP_PRINTF("huh? control set?\n");
  805                         SCTP_RELEASE_PKT(inp->control);
  806                         inp->control = NULL;
  807                 }
  808                 inp->control = control;
  809         }
  810         /* Place the data */
  811         if (inp->pkt) {
  812                 SCTP_BUF_NEXT(inp->pkt_last) = m;
  813                 inp->pkt_last = m;
  814         } else {
  815                 inp->pkt_last = inp->pkt = m;
  816         }
  817         if (
  818         /* FreeBSD and MacOSX uses a flag passed */
  819             ((flags & PRUS_MORETOCOME) == 0)
  820             ) {
  821                 /*
  822                  * note with the current version this code will only be used
  823                  * by OpenBSD, NetBSD and FreeBSD have methods for
  824                  * re-defining sosend() to use sctp_sosend().  One can
  825                  * optionaly switch back to this code (by changing back the
  826                  * defininitions but this is not advisable.
  827                  */
  828                 int ret;
  829 
  830                 ret = sctp_output(inp, inp->pkt, addr, inp->control, p, flags);
  831                 inp->pkt = NULL;
  832                 inp->control = NULL;
  833                 return (ret);
  834         } else {
  835                 return (0);
  836         }
  837 }
  838 
  839 static int
  840 sctp6_connect(struct socket *so, struct sockaddr *addr, struct thread *p)
  841 {
  842         uint32_t vrf_id;
  843         int error = 0;
  844         struct sctp_inpcb *inp;
  845         struct sctp_tcb *stcb;
  846 
  847 #ifdef INET
  848         struct in6pcb *inp6;
  849         struct sockaddr_in6 *sin6;
  850         union sctp_sockstore store;
  851 
  852 #endif
  853 
  854 #ifdef INET
  855         inp6 = (struct in6pcb *)so->so_pcb;
  856 #endif
  857         inp = (struct sctp_inpcb *)so->so_pcb;
  858         if (inp == NULL) {
  859                 SCTP_LTRACE_ERR_RET(inp, NULL, NULL, SCTP_FROM_SCTP6_USRREQ, ECONNRESET);
  860                 return (ECONNRESET);    /* I made the same as TCP since we are
  861                                          * not setup? */
  862         }
  863         if (addr == NULL) {
  864                 SCTP_LTRACE_ERR_RET(inp, NULL, NULL, SCTP_FROM_SCTP6_USRREQ, EINVAL);
  865                 return (EINVAL);
  866         }
  867         switch (addr->sa_family) {
  868 #ifdef INET
  869         case AF_INET:
  870                 if (addr->sa_len != sizeof(struct sockaddr_in)) {
  871                         SCTP_LTRACE_ERR_RET(inp, NULL, NULL, SCTP_FROM_SCTP6_USRREQ, EINVAL);
  872                         return (EINVAL);
  873                 }
  874                 break;
  875 #endif
  876 #ifdef INET6
  877         case AF_INET6:
  878                 if (addr->sa_len != sizeof(struct sockaddr_in6)) {
  879                         SCTP_LTRACE_ERR_RET(inp, NULL, NULL, SCTP_FROM_SCTP6_USRREQ, EINVAL);
  880                         return (EINVAL);
  881                 }
  882                 break;
  883 #endif
  884         default:
  885                 SCTP_LTRACE_ERR_RET(inp, NULL, NULL, SCTP_FROM_SCTP6_USRREQ, EINVAL);
  886                 return (EINVAL);
  887         }
  888 
  889         vrf_id = inp->def_vrf_id;
  890         SCTP_ASOC_CREATE_LOCK(inp);
  891         SCTP_INP_RLOCK(inp);
  892         if ((inp->sctp_flags & SCTP_PCB_FLAGS_UNBOUND) ==
  893             SCTP_PCB_FLAGS_UNBOUND) {
  894                 /* Bind a ephemeral port */
  895                 SCTP_INP_RUNLOCK(inp);
  896                 error = sctp6_bind(so, NULL, p);
  897                 if (error) {
  898                         SCTP_ASOC_CREATE_UNLOCK(inp);
  899 
  900                         return (error);
  901                 }
  902                 SCTP_INP_RLOCK(inp);
  903         }
  904         if ((inp->sctp_flags & SCTP_PCB_FLAGS_TCPTYPE) &&
  905             (inp->sctp_flags & SCTP_PCB_FLAGS_CONNECTED)) {
  906                 /* We are already connected AND the TCP model */
  907                 SCTP_INP_RUNLOCK(inp);
  908                 SCTP_ASOC_CREATE_UNLOCK(inp);
  909                 SCTP_LTRACE_ERR_RET(inp, NULL, NULL, SCTP_FROM_SCTP6_USRREQ, EADDRINUSE);
  910                 return (EADDRINUSE);
  911         }
  912 #ifdef INET
  913         sin6 = (struct sockaddr_in6 *)addr;
  914         if (SCTP_IPV6_V6ONLY(inp6)) {
  915                 /*
  916                  * if IPV6_V6ONLY flag, ignore connections destined to a v4
  917                  * addr or v4-mapped addr
  918                  */
  919                 if (addr->sa_family == AF_INET) {
  920                         SCTP_INP_RUNLOCK(inp);
  921                         SCTP_ASOC_CREATE_UNLOCK(inp);
  922                         SCTP_LTRACE_ERR_RET(inp, NULL, NULL, SCTP_FROM_SCTP6_USRREQ, EINVAL);
  923                         return (EINVAL);
  924                 }
  925                 if (IN6_IS_ADDR_V4MAPPED(&sin6->sin6_addr)) {
  926                         SCTP_INP_RUNLOCK(inp);
  927                         SCTP_ASOC_CREATE_UNLOCK(inp);
  928                         SCTP_LTRACE_ERR_RET(inp, NULL, NULL, SCTP_FROM_SCTP6_USRREQ, EINVAL);
  929                         return (EINVAL);
  930                 }
  931         }
  932         if (IN6_IS_ADDR_V4MAPPED(&sin6->sin6_addr)) {
  933                 /* convert v4-mapped into v4 addr */
  934                 in6_sin6_2_sin(&store.sin, sin6);
  935                 addr = &store.sa;
  936         }
  937 #endif                          /* INET */
  938         /* Now do we connect? */
  939         if (inp->sctp_flags & SCTP_PCB_FLAGS_CONNECTED) {
  940                 stcb = LIST_FIRST(&inp->sctp_asoc_list);
  941                 if (stcb) {
  942                         SCTP_TCB_UNLOCK(stcb);
  943                 }
  944                 SCTP_INP_RUNLOCK(inp);
  945         } else {
  946                 SCTP_INP_RUNLOCK(inp);
  947                 SCTP_INP_WLOCK(inp);
  948                 SCTP_INP_INCR_REF(inp);
  949                 SCTP_INP_WUNLOCK(inp);
  950                 stcb = sctp_findassociation_ep_addr(&inp, addr, NULL, NULL, NULL);
  951                 if (stcb == NULL) {
  952                         SCTP_INP_WLOCK(inp);
  953                         SCTP_INP_DECR_REF(inp);
  954                         SCTP_INP_WUNLOCK(inp);
  955                 }
  956         }
  957 
  958         if (stcb != NULL) {
  959                 /* Already have or am bring up an association */
  960                 SCTP_ASOC_CREATE_UNLOCK(inp);
  961                 SCTP_TCB_UNLOCK(stcb);
  962                 SCTP_LTRACE_ERR_RET(inp, NULL, NULL, SCTP_FROM_SCTP6_USRREQ, EALREADY);
  963                 return (EALREADY);
  964         }
  965         /* We are GOOD to go */
  966         stcb = sctp_aloc_assoc(inp, addr, &error, 0, vrf_id, p);
  967         SCTP_ASOC_CREATE_UNLOCK(inp);
  968         if (stcb == NULL) {
  969                 /* Gak! no memory */
  970                 return (error);
  971         }
  972         if (stcb->sctp_ep->sctp_flags & SCTP_PCB_FLAGS_TCPTYPE) {
  973                 stcb->sctp_ep->sctp_flags |= SCTP_PCB_FLAGS_CONNECTED;
  974                 /* Set the connected flag so we can queue data */
  975                 soisconnecting(so);
  976         }
  977         stcb->asoc.state = SCTP_STATE_COOKIE_WAIT;
  978         (void)SCTP_GETTIME_TIMEVAL(&stcb->asoc.time_entered);
  979 
  980         /* initialize authentication parameters for the assoc */
  981         sctp_initialize_auth_params(inp, stcb);
  982 
  983         sctp_send_initiate(inp, stcb, SCTP_SO_LOCKED);
  984         SCTP_TCB_UNLOCK(stcb);
  985         return (error);
  986 }
  987 
  988 static int
  989 sctp6_getaddr(struct socket *so, struct sockaddr **addr)
  990 {
  991         struct sockaddr_in6 *sin6;
  992         struct sctp_inpcb *inp;
  993         uint32_t vrf_id;
  994         struct sctp_ifa *sctp_ifa;
  995 
  996         int error;
  997 
  998         /*
  999          * Do the malloc first in case it blocks.
 1000          */
 1001         SCTP_MALLOC_SONAME(sin6, struct sockaddr_in6 *, sizeof(*sin6));
 1002         if (sin6 == NULL)
 1003                 return (ENOMEM);
 1004         sin6->sin6_family = AF_INET6;
 1005         sin6->sin6_len = sizeof(*sin6);
 1006 
 1007         inp = (struct sctp_inpcb *)so->so_pcb;
 1008         if (inp == NULL) {
 1009                 SCTP_FREE_SONAME(sin6);
 1010                 SCTP_LTRACE_ERR_RET(inp, NULL, NULL, SCTP_FROM_SCTP6_USRREQ, ECONNRESET);
 1011                 return (ECONNRESET);
 1012         }
 1013         SCTP_INP_RLOCK(inp);
 1014         sin6->sin6_port = inp->sctp_lport;
 1015         if (inp->sctp_flags & SCTP_PCB_FLAGS_BOUNDALL) {
 1016                 /* For the bound all case you get back 0 */
 1017                 if (inp->sctp_flags & SCTP_PCB_FLAGS_CONNECTED) {
 1018                         struct sctp_tcb *stcb;
 1019                         struct sockaddr_in6 *sin_a6;
 1020                         struct sctp_nets *net;
 1021                         int fnd;
 1022 
 1023                         stcb = LIST_FIRST(&inp->sctp_asoc_list);
 1024                         if (stcb == NULL) {
 1025                                 goto notConn6;
 1026                         }
 1027                         fnd = 0;
 1028                         sin_a6 = NULL;
 1029                         TAILQ_FOREACH(net, &stcb->asoc.nets, sctp_next) {
 1030                                 sin_a6 = (struct sockaddr_in6 *)&net->ro._l_addr;
 1031                                 if (sin_a6 == NULL)
 1032                                         /* this will make coverity happy */
 1033                                         continue;
 1034 
 1035                                 if (sin_a6->sin6_family == AF_INET6) {
 1036                                         fnd = 1;
 1037                                         break;
 1038                                 }
 1039                         }
 1040                         if ((!fnd) || (sin_a6 == NULL)) {
 1041                                 /* punt */
 1042                                 goto notConn6;
 1043                         }
 1044                         vrf_id = inp->def_vrf_id;
 1045                         sctp_ifa = sctp_source_address_selection(inp, stcb, (sctp_route_t *) & net->ro, net, 0, vrf_id);
 1046                         if (sctp_ifa) {
 1047                                 sin6->sin6_addr = sctp_ifa->address.sin6.sin6_addr;
 1048                         }
 1049                 } else {
 1050                         /* For the bound all case you get back 0 */
 1051         notConn6:
 1052                         memset(&sin6->sin6_addr, 0, sizeof(sin6->sin6_addr));
 1053                 }
 1054         } else {
 1055                 /* Take the first IPv6 address in the list */
 1056                 struct sctp_laddr *laddr;
 1057                 int fnd = 0;
 1058 
 1059                 LIST_FOREACH(laddr, &inp->sctp_addr_list, sctp_nxt_addr) {
 1060                         if (laddr->ifa->address.sa.sa_family == AF_INET6) {
 1061                                 struct sockaddr_in6 *sin_a;
 1062 
 1063                                 sin_a = &laddr->ifa->address.sin6;
 1064                                 sin6->sin6_addr = sin_a->sin6_addr;
 1065                                 fnd = 1;
 1066                                 break;
 1067                         }
 1068                 }
 1069                 if (!fnd) {
 1070                         SCTP_FREE_SONAME(sin6);
 1071                         SCTP_INP_RUNLOCK(inp);
 1072                         SCTP_LTRACE_ERR_RET(inp, NULL, NULL, SCTP_FROM_SCTP6_USRREQ, ENOENT);
 1073                         return (ENOENT);
 1074                 }
 1075         }
 1076         SCTP_INP_RUNLOCK(inp);
 1077         /* Scoping things for v6 */
 1078         if ((error = sa6_recoverscope(sin6)) != 0) {
 1079                 SCTP_FREE_SONAME(sin6);
 1080                 return (error);
 1081         }
 1082         (*addr) = (struct sockaddr *)sin6;
 1083         return (0);
 1084 }
 1085 
 1086 static int
 1087 sctp6_peeraddr(struct socket *so, struct sockaddr **addr)
 1088 {
 1089         struct sockaddr_in6 *sin6;
 1090         int fnd;
 1091         struct sockaddr_in6 *sin_a6;
 1092         struct sctp_inpcb *inp;
 1093         struct sctp_tcb *stcb;
 1094         struct sctp_nets *net;
 1095         int error;
 1096 
 1097         /* Do the malloc first in case it blocks. */
 1098         SCTP_MALLOC_SONAME(sin6, struct sockaddr_in6 *, sizeof *sin6);
 1099         if (sin6 == NULL)
 1100                 return (ENOMEM);
 1101         sin6->sin6_family = AF_INET6;
 1102         sin6->sin6_len = sizeof(*sin6);
 1103 
 1104         inp = (struct sctp_inpcb *)so->so_pcb;
 1105         if ((inp == NULL) ||
 1106             ((inp->sctp_flags & SCTP_PCB_FLAGS_CONNECTED) == 0)) {
 1107                 /* UDP type and listeners will drop out here */
 1108                 SCTP_FREE_SONAME(sin6);
 1109                 SCTP_LTRACE_ERR_RET(inp, NULL, NULL, SCTP_FROM_SCTP6_USRREQ, ENOTCONN);
 1110                 return (ENOTCONN);
 1111         }
 1112         SCTP_INP_RLOCK(inp);
 1113         stcb = LIST_FIRST(&inp->sctp_asoc_list);
 1114         if (stcb) {
 1115                 SCTP_TCB_LOCK(stcb);
 1116         }
 1117         SCTP_INP_RUNLOCK(inp);
 1118         if (stcb == NULL) {
 1119                 SCTP_FREE_SONAME(sin6);
 1120                 SCTP_LTRACE_ERR_RET(inp, NULL, NULL, SCTP_FROM_SCTP6_USRREQ, ECONNRESET);
 1121                 return (ECONNRESET);
 1122         }
 1123         fnd = 0;
 1124         TAILQ_FOREACH(net, &stcb->asoc.nets, sctp_next) {
 1125                 sin_a6 = (struct sockaddr_in6 *)&net->ro._l_addr;
 1126                 if (sin_a6->sin6_family == AF_INET6) {
 1127                         fnd = 1;
 1128                         sin6->sin6_port = stcb->rport;
 1129                         sin6->sin6_addr = sin_a6->sin6_addr;
 1130                         break;
 1131                 }
 1132         }
 1133         SCTP_TCB_UNLOCK(stcb);
 1134         if (!fnd) {
 1135                 /* No IPv4 address */
 1136                 SCTP_FREE_SONAME(sin6);
 1137                 SCTP_LTRACE_ERR_RET(inp, NULL, NULL, SCTP_FROM_SCTP6_USRREQ, ENOENT);
 1138                 return (ENOENT);
 1139         }
 1140         if ((error = sa6_recoverscope(sin6)) != 0)
 1141                 return (error);
 1142         *addr = (struct sockaddr *)sin6;
 1143         return (0);
 1144 }
 1145 
 1146 static int
 1147 sctp6_in6getaddr(struct socket *so, struct sockaddr **nam)
 1148 {
 1149 #ifdef INET
 1150         struct sockaddr *addr;
 1151 
 1152 #endif
 1153         struct in6pcb *inp6 = sotoin6pcb(so);
 1154         int error;
 1155 
 1156         if (inp6 == NULL) {
 1157                 SCTP_LTRACE_ERR_RET(NULL, NULL, NULL, SCTP_FROM_SCTP6_USRREQ, EINVAL);
 1158                 return (EINVAL);
 1159         }
 1160         /* allow v6 addresses precedence */
 1161         error = sctp6_getaddr(so, nam);
 1162 #ifdef INET
 1163         if (error) {
 1164                 /* try v4 next if v6 failed */
 1165                 error = sctp_ingetaddr(so, nam);
 1166                 if (error) {
 1167                         return (error);
 1168                 }
 1169                 addr = *nam;
 1170                 /* if I'm V6ONLY, convert it to v4-mapped */
 1171                 if (SCTP_IPV6_V6ONLY(inp6)) {
 1172                         struct sockaddr_in6 sin6;
 1173 
 1174                         in6_sin_2_v4mapsin6((struct sockaddr_in *)addr, &sin6);
 1175                         memcpy(addr, &sin6, sizeof(struct sockaddr_in6));
 1176                 }
 1177         }
 1178 #endif
 1179         return (error);
 1180 }
 1181 
 1182 
 1183 static int
 1184 sctp6_getpeeraddr(struct socket *so, struct sockaddr **nam)
 1185 {
 1186 #ifdef INET
 1187         struct sockaddr *addr;
 1188 
 1189 #endif
 1190         struct in6pcb *inp6 = sotoin6pcb(so);
 1191         int error;
 1192 
 1193         if (inp6 == NULL) {
 1194                 SCTP_LTRACE_ERR_RET(NULL, NULL, NULL, SCTP_FROM_SCTP6_USRREQ, EINVAL);
 1195                 return (EINVAL);
 1196         }
 1197         /* allow v6 addresses precedence */
 1198         error = sctp6_peeraddr(so, nam);
 1199 #ifdef INET
 1200         if (error) {
 1201                 /* try v4 next if v6 failed */
 1202                 error = sctp_peeraddr(so, nam);
 1203                 if (error) {
 1204                         return (error);
 1205                 }
 1206                 addr = *nam;
 1207                 /* if I'm V6ONLY, convert it to v4-mapped */
 1208                 if (SCTP_IPV6_V6ONLY(inp6)) {
 1209                         struct sockaddr_in6 sin6;
 1210 
 1211                         in6_sin_2_v4mapsin6((struct sockaddr_in *)addr, &sin6);
 1212                         memcpy(addr, &sin6, sizeof(struct sockaddr_in6));
 1213                 }
 1214         }
 1215 #endif
 1216         return (error);
 1217 }
 1218 
 1219 struct pr_usrreqs sctp6_usrreqs = {
 1220         .pru_abort = sctp6_abort,
 1221         .pru_accept = sctp_accept,
 1222         .pru_attach = sctp6_attach,
 1223         .pru_bind = sctp6_bind,
 1224         .pru_connect = sctp6_connect,
 1225         .pru_control = in6_control,
 1226         .pru_close = sctp6_close,
 1227         .pru_detach = sctp6_close,
 1228         .pru_sopoll = sopoll_generic,
 1229         .pru_flush = sctp_flush,
 1230         .pru_disconnect = sctp6_disconnect,
 1231         .pru_listen = sctp_listen,
 1232         .pru_peeraddr = sctp6_getpeeraddr,
 1233         .pru_send = sctp6_send,
 1234         .pru_shutdown = sctp_shutdown,
 1235         .pru_sockaddr = sctp6_in6getaddr,
 1236         .pru_sosend = sctp_sosend,
 1237         .pru_soreceive = sctp_soreceive
 1238 };
 1239 
 1240 #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
