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