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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 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                 /* check if we can safely examine src and dst ports */
397                 struct sctp_inpcb *inp = NULL;
398                 struct sctp_tcb *stcb = NULL;
399                 struct sctp_nets *net = NULL;
400                 struct sockaddr_in6 final;
401
402                 if (ip6cp->ip6c_m == NULL)
403                         return;
404
405                 bzero(&sh, sizeof(sh));
406                 bzero(&final, sizeof(final));
407                 inp = NULL;
408                 net = NULL;
409                 m_copydata(ip6cp->ip6c_m, ip6cp->ip6c_off, sizeof(sh),
410                     (caddr_t)&sh);
411                 ip6cp->ip6c_src->sin6_port = sh.src_port;
412                 final.sin6_len = sizeof(final);
413                 final.sin6_family = AF_INET6;
414                 final.sin6_addr = ((struct sockaddr_in6 *)pktdst)->sin6_addr;
415                 final.sin6_port = sh.dest_port;
416                 stcb = sctp_findassociation_addr_sa((struct sockaddr *)&final,
417                     (struct sockaddr *)ip6cp->ip6c_src,
418                     &inp, &net, 1, vrf_id);
419                 /* inp's ref-count increased && stcb locked */
420                 if (stcb != NULL && inp && (inp->sctp_socket != NULL)) {
421                         if (cmd == PRC_MSGSIZE) {
422                                 sctp6_notify_mbuf(inp,
423                                     ip6cp->ip6c_icmp6,
424                                     &sh,
425                                     stcb,
426                                     net);
427                                 /* inp's ref-count reduced && stcb unlocked */
428                         } else {
429                                 sctp6_notify(inp, ip6cp->ip6c_icmp6, &sh,
430                                     (struct sockaddr *)&final,
431                                     stcb, net);
432                                 /* inp's ref-count reduced && stcb unlocked */
433                         }
434                 } else {
435                         if (PRC_IS_REDIRECT(cmd) && inp) {
436                                 in6_rtchange((struct in6pcb *)inp,
437                                     inet6ctlerrmap[cmd]);
438                         }
439                         if (inp) {
440                                 /* reduce inp's ref-count */
441                                 SCTP_INP_WLOCK(inp);
442                                 SCTP_INP_DECR_REF(inp);
443                                 SCTP_INP_WUNLOCK(inp);
444                         }
445                         if (stcb)
446                                 SCTP_TCB_UNLOCK(stcb);
447                 }
448         }
449 }
450
451 /*
452  * this routine can probably be collasped into the one in sctp_userreq.c
453  * since they do the same thing and now we lookup with a sockaddr
454  */
455 static int
456 sctp6_getcred(SYSCTL_HANDLER_ARGS)
457 {
458         struct xucred xuc;
459         struct sockaddr_in6 addrs[2];
460         struct sctp_inpcb *inp;
461         struct sctp_nets *net;
462         struct sctp_tcb *stcb;
463         int error;
464         uint32_t vrf_id;
465
466         vrf_id = SCTP_DEFAULT_VRFID;
467
468         error = priv_check(req->td, PRIV_NETINET_GETCRED);
469         if (error)
470                 return (error);
471
472         if (req->newlen != sizeof(addrs)) {
473                 SCTP_LTRACE_ERR_RET(NULL, NULL, NULL, SCTP_FROM_SCTP6_USRREQ, EINVAL);
474                 return (EINVAL);
475         }
476         if (req->oldlen != sizeof(struct ucred)) {
477                 SCTP_LTRACE_ERR_RET(NULL, NULL, NULL, SCTP_FROM_SCTP6_USRREQ, EINVAL);
478                 return (EINVAL);
479         }
480         error = SYSCTL_IN(req, addrs, sizeof(addrs));
481         if (error)
482                 return (error);
483
484         stcb = sctp_findassociation_addr_sa(sin6tosa(&addrs[1]),
485             sin6tosa(&addrs[0]),
486             &inp, &net, 1, vrf_id);
487         if (stcb == NULL || inp == NULL || inp->sctp_socket == NULL) {
488                 if ((inp != NULL) && (stcb == NULL)) {
489                         /* reduce ref-count */
490                         SCTP_INP_WLOCK(inp);
491                         SCTP_INP_DECR_REF(inp);
492                         goto cred_can_cont;
493                 }
494                 SCTP_LTRACE_ERR_RET(inp, NULL, NULL, SCTP_FROM_SCTP6_USRREQ, ENOENT);
495                 error = ENOENT;
496                 goto out;
497         }
498         SCTP_TCB_UNLOCK(stcb);
499         /*
500          * We use the write lock here, only since in the error leg we need
501          * it. If we used RLOCK, then we would have to
502          * wlock/decr/unlock/rlock. Which in theory could create a hole.
503          * Better to use higher wlock.
504          */
505         SCTP_INP_WLOCK(inp);
506 cred_can_cont:
507         error = cr_canseesocket(req->td->td_ucred, inp->sctp_socket);
508         if (error) {
509                 SCTP_INP_WUNLOCK(inp);
510                 goto out;
511         }
512         cru2x(inp->sctp_socket->so_cred, &xuc);
513         SCTP_INP_WUNLOCK(inp);
514         error = SYSCTL_OUT(req, &xuc, sizeof(struct xucred));
515 out:
516         return (error);
517 }
518
519 SYSCTL_PROC(_net_inet6_sctp6, OID_AUTO, getcred, CTLTYPE_OPAQUE | CTLFLAG_RW,
520     0, 0,
521     sctp6_getcred, "S,ucred", "Get the ucred of a SCTP6 connection");
522
523
524 /* This is the same as the sctp_abort() could be made common */
525 static void
526 sctp6_abort(struct socket *so)
527 {
528         struct sctp_inpcb *inp;
529         uint32_t flags;
530
531         inp = (struct sctp_inpcb *)so->so_pcb;
532         if (inp == NULL) {
533                 SCTP_LTRACE_ERR_RET(inp, NULL, NULL, SCTP_FROM_SCTP6_USRREQ, EINVAL);
534                 return;
535         }
536 sctp_must_try_again:
537         flags = inp->sctp_flags;
538 #ifdef SCTP_LOG_CLOSING
539         sctp_log_closing(inp, NULL, 17);
540 #endif
541         if (((flags & SCTP_PCB_FLAGS_SOCKET_GONE) == 0) &&
542             (atomic_cmpset_int(&inp->sctp_flags, flags, (flags | SCTP_PCB_FLAGS_SOCKET_GONE | SCTP_PCB_FLAGS_CLOSE_IP)))) {
543 #ifdef SCTP_LOG_CLOSING
544                 sctp_log_closing(inp, NULL, 16);
545 #endif
546                 sctp_inpcb_free(inp, SCTP_FREE_SHOULD_USE_ABORT,
547                     SCTP_CALLED_AFTER_CMPSET_OFCLOSE);
548                 SOCK_LOCK(so);
549                 SCTP_SB_CLEAR(so->so_snd);
550                 /*
551                  * same for the rcv ones, they are only here for the
552                  * accounting/select.
553                  */
554                 SCTP_SB_CLEAR(so->so_rcv);
555                 /* Now null out the reference, we are completely detached. */
556                 so->so_pcb = NULL;
557                 SOCK_UNLOCK(so);
558         } else {
559                 flags = inp->sctp_flags;
560                 if ((flags & SCTP_PCB_FLAGS_SOCKET_GONE) == 0) {
561                         goto sctp_must_try_again;
562                 }
563         }
564         return;
565 }
566
567 static int
568 sctp6_attach(struct socket *so, int proto SCTP_UNUSED, struct thread *p SCTP_UNUSED)
569 {
570         struct in6pcb *inp6;
571         int error;
572         struct sctp_inpcb *inp;
573         uint32_t vrf_id = SCTP_DEFAULT_VRFID;
574
575         inp = (struct sctp_inpcb *)so->so_pcb;
576         if (inp != NULL) {
577                 SCTP_LTRACE_ERR_RET(inp, NULL, NULL, SCTP_FROM_SCTP6_USRREQ, EINVAL);
578                 return (EINVAL);
579         }
580         if (so->so_snd.sb_hiwat == 0 || so->so_rcv.sb_hiwat == 0) {
581                 error = SCTP_SORESERVE(so, SCTP_BASE_SYSCTL(sctp_sendspace), SCTP_BASE_SYSCTL(sctp_recvspace));
582                 if (error)
583                         return (error);
584         }
585         error = sctp_inpcb_alloc(so, vrf_id);
586         if (error)
587                 return (error);
588         inp = (struct sctp_inpcb *)so->so_pcb;
589         SCTP_INP_WLOCK(inp);
590         inp->sctp_flags |= SCTP_PCB_FLAGS_BOUND_V6;     /* I'm v6! */
591         inp6 = (struct in6pcb *)inp;
592
593         inp6->inp_vflag |= INP_IPV6;
594         inp6->in6p_hops = -1;   /* use kernel default */
595         inp6->in6p_cksum = -1;  /* just to be sure */
596 #ifdef INET
597         /*
598          * XXX: ugly!! IPv4 TTL initialization is necessary for an IPv6
599          * socket as well, because the socket may be bound to an IPv6
600          * wildcard address, which may match an IPv4-mapped IPv6 address.
601          */
602         inp6->inp_ip_ttl = MODULE_GLOBAL(ip_defttl);
603 #endif
604         /*
605          * Hmm what about the IPSEC stuff that is missing here but in
606          * sctp_attach()?
607          */
608         SCTP_INP_WUNLOCK(inp);
609         return (0);
610 }
611
612 static int
613 sctp6_bind(struct socket *so, struct sockaddr *addr, struct thread *p)
614 {
615         struct sctp_inpcb *inp;
616         struct in6pcb *inp6;
617         int error;
618
619         inp = (struct sctp_inpcb *)so->so_pcb;
620         if (inp == NULL) {
621                 SCTP_LTRACE_ERR_RET(inp, NULL, NULL, SCTP_FROM_SCTP6_USRREQ, EINVAL);
622                 return (EINVAL);
623         }
624         if (addr) {
625                 switch (addr->sa_family) {
626 #ifdef INET
627                 case AF_INET:
628                         if (addr->sa_len != sizeof(struct sockaddr_in)) {
629                                 SCTP_LTRACE_ERR_RET(inp, NULL, NULL, SCTP_FROM_SCTP6_USRREQ, EINVAL);
630                                 return (EINVAL);
631                         }
632                         break;
633 #endif
634 #ifdef INET6
635                 case AF_INET6:
636                         if (addr->sa_len != sizeof(struct sockaddr_in6)) {
637                                 SCTP_LTRACE_ERR_RET(inp, NULL, NULL, SCTP_FROM_SCTP6_USRREQ, EINVAL);
638                                 return (EINVAL);
639                         }
640                         break;
641 #endif
642                 default:
643                         SCTP_LTRACE_ERR_RET(inp, NULL, NULL, SCTP_FROM_SCTP6_USRREQ, EINVAL);
644                         return (EINVAL);
645                 }
646         }
647         inp6 = (struct in6pcb *)inp;
648         inp6->inp_vflag &= ~INP_IPV4;
649         inp6->inp_vflag |= INP_IPV6;
650         if ((addr != NULL) && (SCTP_IPV6_V6ONLY(inp6) == 0)) {
651                 switch (addr->sa_family) {
652 #ifdef INET
653                 case AF_INET:
654                         /* binding v4 addr to v6 socket, so reset flags */
655                         inp6->inp_vflag |= INP_IPV4;
656                         inp6->inp_vflag &= ~INP_IPV6;
657                         break;
658 #endif
659 #ifdef INET6
660                 case AF_INET6:
661                         {
662                                 struct sockaddr_in6 *sin6_p;
663
664                                 sin6_p = (struct sockaddr_in6 *)addr;
665
666                                 if (IN6_IS_ADDR_UNSPECIFIED(&sin6_p->sin6_addr)) {
667                                         inp6->inp_vflag |= INP_IPV4;
668                                 }
669 #ifdef INET
670                                 if (IN6_IS_ADDR_V4MAPPED(&sin6_p->sin6_addr)) {
671                                         struct sockaddr_in sin;
672
673                                         in6_sin6_2_sin(&sin, sin6_p);
674                                         inp6->inp_vflag |= INP_IPV4;
675                                         inp6->inp_vflag &= ~INP_IPV6;
676                                         error = sctp_inpcb_bind(so, (struct sockaddr *)&sin, NULL, p);
677                                         return (error);
678                                 }
679 #endif
680                                 break;
681                         }
682 #endif
683                 default:
684                         break;
685                 }
686         } else if (addr != NULL) {
687                 struct sockaddr_in6 *sin6_p;
688
689                 /* IPV6_V6ONLY socket */
690 #ifdef INET
691                 if (addr->sa_family == AF_INET) {
692                         /* can't bind v4 addr to v6 only socket! */
693                         SCTP_LTRACE_ERR_RET(inp, NULL, NULL, SCTP_FROM_SCTP6_USRREQ, EINVAL);
694                         return (EINVAL);
695                 }
696 #endif
697                 sin6_p = (struct sockaddr_in6 *)addr;
698
699                 if (IN6_IS_ADDR_V4MAPPED(&sin6_p->sin6_addr)) {
700                         /* can't bind v4-mapped addrs either! */
701                         /* NOTE: we don't support SIIT */
702                         SCTP_LTRACE_ERR_RET(inp, NULL, NULL, SCTP_FROM_SCTP6_USRREQ, EINVAL);
703                         return (EINVAL);
704                 }
705         }
706         error = sctp_inpcb_bind(so, addr, NULL, p);
707         return (error);
708 }
709
710
711 static void
712 sctp6_close(struct socket *so)
713 {
714         sctp_close(so);
715 }
716
717 /* This could be made common with sctp_detach() since they are identical */
718
719 static
720 int
721 sctp6_disconnect(struct socket *so)
722 {
723         return (sctp_disconnect(so));
724 }
725
726
727 int
728 sctp_sendm(struct socket *so, int flags, struct mbuf *m, struct sockaddr *addr,
729     struct mbuf *control, struct thread *p);
730
731
732 static int
733 sctp6_send(struct socket *so, int flags, struct mbuf *m, struct sockaddr *addr,
734     struct mbuf *control, struct thread *p)
735 {
736         struct sctp_inpcb *inp;
737         struct in6pcb *inp6;
738
739 #ifdef INET
740         struct sockaddr_in6 *sin6;
741
742 #endif                          /* INET */
743         /* No SPL needed since sctp_output does this */
744
745         inp = (struct sctp_inpcb *)so->so_pcb;
746         if (inp == NULL) {
747                 if (control) {
748                         SCTP_RELEASE_PKT(control);
749                         control = NULL;
750                 }
751                 SCTP_RELEASE_PKT(m);
752                 SCTP_LTRACE_ERR_RET(inp, NULL, NULL, SCTP_FROM_SCTP6_USRREQ, EINVAL);
753                 return (EINVAL);
754         }
755         inp6 = (struct in6pcb *)inp;
756         /*
757          * For the TCP model we may get a NULL addr, if we are a connected
758          * socket thats ok.
759          */
760         if ((inp->sctp_flags & SCTP_PCB_FLAGS_CONNECTED) &&
761             (addr == NULL)) {
762                 goto connected_type;
763         }
764         if (addr == NULL) {
765                 SCTP_RELEASE_PKT(m);
766                 if (control) {
767                         SCTP_RELEASE_PKT(control);
768                         control = NULL;
769                 }
770                 SCTP_LTRACE_ERR_RET(inp, NULL, NULL, SCTP_FROM_SCTP6_USRREQ, EDESTADDRREQ);
771                 return (EDESTADDRREQ);
772         }
773 #ifdef INET
774         sin6 = (struct sockaddr_in6 *)addr;
775         if (SCTP_IPV6_V6ONLY(inp6)) {
776                 /*
777                  * if IPV6_V6ONLY flag, we discard datagrams destined to a
778                  * v4 addr or v4-mapped addr
779                  */
780                 if (addr->sa_family == AF_INET) {
781                         SCTP_LTRACE_ERR_RET(inp, NULL, NULL, SCTP_FROM_SCTP6_USRREQ, EINVAL);
782                         return (EINVAL);
783                 }
784                 if (IN6_IS_ADDR_V4MAPPED(&sin6->sin6_addr)) {
785                         SCTP_LTRACE_ERR_RET(inp, NULL, NULL, SCTP_FROM_SCTP6_USRREQ, EINVAL);
786                         return (EINVAL);
787                 }
788         }
789         if (IN6_IS_ADDR_V4MAPPED(&sin6->sin6_addr)) {
790                 struct sockaddr_in sin;
791
792                 /* convert v4-mapped into v4 addr and send */
793                 in6_sin6_2_sin(&sin, sin6);
794                 return (sctp_sendm(so, flags, m, (struct sockaddr *)&sin, control, p));
795         }
796 #endif                          /* INET */
797 connected_type:
798         /* now what about control */
799         if (control) {
800                 if (inp->control) {
801                         SCTP_PRINTF("huh? control set?\n");
802                         SCTP_RELEASE_PKT(inp->control);
803                         inp->control = NULL;
804                 }
805                 inp->control = control;
806         }
807         /* Place the data */
808         if (inp->pkt) {
809                 SCTP_BUF_NEXT(inp->pkt_last) = m;
810                 inp->pkt_last = m;
811         } else {
812                 inp->pkt_last = inp->pkt = m;
813         }
814         if (
815         /* FreeBSD and MacOSX uses a flag passed */
816             ((flags & PRUS_MORETOCOME) == 0)
817             ) {
818                 /*
819                  * note with the current version this code will only be used
820                  * by OpenBSD, NetBSD and FreeBSD have methods for
821                  * re-defining sosend() to use sctp_sosend().  One can
822                  * optionaly switch back to this code (by changing back the
823                  * defininitions but this is not advisable.
824                  */
825                 int ret;
826
827                 ret = sctp_output(inp, inp->pkt, addr, inp->control, p, flags);
828                 inp->pkt = NULL;
829                 inp->control = NULL;
830                 return (ret);
831         } else {
832                 return (0);
833         }
834 }
835
836 static int
837 sctp6_connect(struct socket *so, struct sockaddr *addr, struct thread *p)
838 {
839         uint32_t vrf_id;
840         int error = 0;
841         struct sctp_inpcb *inp;
842         struct sctp_tcb *stcb;
843
844 #ifdef INET
845         struct in6pcb *inp6;
846         struct sockaddr_in6 *sin6;
847         struct sockaddr_storage ss;
848
849 #endif
850
851 #ifdef INET
852         inp6 = (struct in6pcb *)so->so_pcb;
853 #endif
854         inp = (struct sctp_inpcb *)so->so_pcb;
855         if (inp == NULL) {
856                 SCTP_LTRACE_ERR_RET(inp, NULL, NULL, SCTP_FROM_SCTP6_USRREQ, ECONNRESET);
857                 return (ECONNRESET);    /* I made the same as TCP since we are
858                                          * not setup? */
859         }
860         if (addr == NULL) {
861                 SCTP_LTRACE_ERR_RET(inp, NULL, NULL, SCTP_FROM_SCTP6_USRREQ, EINVAL);
862                 return (EINVAL);
863         }
864         switch (addr->sa_family) {
865 #ifdef INET
866         case AF_INET:
867                 if (addr->sa_len != sizeof(struct sockaddr_in)) {
868                         SCTP_LTRACE_ERR_RET(inp, NULL, NULL, SCTP_FROM_SCTP6_USRREQ, EINVAL);
869                         return (EINVAL);
870                 }
871                 break;
872 #endif
873 #ifdef INET6
874         case AF_INET6:
875                 if (addr->sa_len != sizeof(struct sockaddr_in6)) {
876                         SCTP_LTRACE_ERR_RET(inp, NULL, NULL, SCTP_FROM_SCTP6_USRREQ, EINVAL);
877                         return (EINVAL);
878                 }
879                 break;
880 #endif
881         default:
882                 SCTP_LTRACE_ERR_RET(inp, NULL, NULL, SCTP_FROM_SCTP6_USRREQ, EINVAL);
883                 return (EINVAL);
884         }
885
886         vrf_id = inp->def_vrf_id;
887         SCTP_ASOC_CREATE_LOCK(inp);
888         SCTP_INP_RLOCK(inp);
889         if ((inp->sctp_flags & SCTP_PCB_FLAGS_UNBOUND) ==
890             SCTP_PCB_FLAGS_UNBOUND) {
891                 /* Bind a ephemeral port */
892                 SCTP_INP_RUNLOCK(inp);
893                 error = sctp6_bind(so, NULL, p);
894                 if (error) {
895                         SCTP_ASOC_CREATE_UNLOCK(inp);
896
897                         return (error);
898                 }
899                 SCTP_INP_RLOCK(inp);
900         }
901         if ((inp->sctp_flags & SCTP_PCB_FLAGS_TCPTYPE) &&
902             (inp->sctp_flags & SCTP_PCB_FLAGS_CONNECTED)) {
903                 /* We are already connected AND the TCP model */
904                 SCTP_INP_RUNLOCK(inp);
905                 SCTP_ASOC_CREATE_UNLOCK(inp);
906                 SCTP_LTRACE_ERR_RET(inp, NULL, NULL, SCTP_FROM_SCTP6_USRREQ, EADDRINUSE);
907                 return (EADDRINUSE);
908         }
909 #ifdef INET
910         sin6 = (struct sockaddr_in6 *)addr;
911         if (SCTP_IPV6_V6ONLY(inp6)) {
912                 /*
913                  * if IPV6_V6ONLY flag, ignore connections destined to a v4
914                  * addr or v4-mapped addr
915                  */
916                 if (addr->sa_family == AF_INET) {
917                         SCTP_INP_RUNLOCK(inp);
918                         SCTP_ASOC_CREATE_UNLOCK(inp);
919                         SCTP_LTRACE_ERR_RET(inp, NULL, NULL, SCTP_FROM_SCTP6_USRREQ, EINVAL);
920                         return (EINVAL);
921                 }
922                 if (IN6_IS_ADDR_V4MAPPED(&sin6->sin6_addr)) {
923                         SCTP_INP_RUNLOCK(inp);
924                         SCTP_ASOC_CREATE_UNLOCK(inp);
925                         SCTP_LTRACE_ERR_RET(inp, NULL, NULL, SCTP_FROM_SCTP6_USRREQ, EINVAL);
926                         return (EINVAL);
927                 }
928         }
929         if (IN6_IS_ADDR_V4MAPPED(&sin6->sin6_addr)) {
930                 /* convert v4-mapped into v4 addr */
931                 in6_sin6_2_sin((struct sockaddr_in *)&ss, sin6);
932                 addr = (struct sockaddr *)&ss;
933         }
934 #endif                          /* INET */
935         /* Now do we connect? */
936         if (inp->sctp_flags & SCTP_PCB_FLAGS_CONNECTED) {
937                 stcb = LIST_FIRST(&inp->sctp_asoc_list);
938                 if (stcb) {
939                         SCTP_TCB_UNLOCK(stcb);
940                 }
941                 SCTP_INP_RUNLOCK(inp);
942         } else {
943                 SCTP_INP_RUNLOCK(inp);
944                 SCTP_INP_WLOCK(inp);
945                 SCTP_INP_INCR_REF(inp);
946                 SCTP_INP_WUNLOCK(inp);
947                 stcb = sctp_findassociation_ep_addr(&inp, addr, NULL, NULL, NULL);
948                 if (stcb == NULL) {
949                         SCTP_INP_WLOCK(inp);
950                         SCTP_INP_DECR_REF(inp);
951                         SCTP_INP_WUNLOCK(inp);
952                 }
953         }
954
955         if (stcb != NULL) {
956                 /* Already have or am bring up an association */
957                 SCTP_ASOC_CREATE_UNLOCK(inp);
958                 SCTP_TCB_UNLOCK(stcb);
959                 SCTP_LTRACE_ERR_RET(inp, NULL, NULL, SCTP_FROM_SCTP6_USRREQ, EALREADY);
960                 return (EALREADY);
961         }
962         /* We are GOOD to go */
963         stcb = sctp_aloc_assoc(inp, addr, &error, 0, vrf_id, p);
964         SCTP_ASOC_CREATE_UNLOCK(inp);
965         if (stcb == NULL) {
966                 /* Gak! no memory */
967                 return (error);
968         }
969         if (stcb->sctp_ep->sctp_flags & SCTP_PCB_FLAGS_TCPTYPE) {
970                 stcb->sctp_ep->sctp_flags |= SCTP_PCB_FLAGS_CONNECTED;
971                 /* Set the connected flag so we can queue data */
972                 soisconnecting(so);
973         }
974         stcb->asoc.state = SCTP_STATE_COOKIE_WAIT;
975         (void)SCTP_GETTIME_TIMEVAL(&stcb->asoc.time_entered);
976
977         /* initialize authentication parameters for the assoc */
978         sctp_initialize_auth_params(inp, stcb);
979
980         sctp_send_initiate(inp, stcb, SCTP_SO_LOCKED);
981         SCTP_TCB_UNLOCK(stcb);
982         return (error);
983 }
984
985 static int
986 sctp6_getaddr(struct socket *so, struct sockaddr **addr)
987 {
988         struct sockaddr_in6 *sin6;
989         struct sctp_inpcb *inp;
990         uint32_t vrf_id;
991         struct sctp_ifa *sctp_ifa;
992
993         int error;
994
995         /*
996          * Do the malloc first in case it blocks.
997          */
998         SCTP_MALLOC_SONAME(sin6, struct sockaddr_in6 *, sizeof(*sin6));
999         if (sin6 == NULL)
1000                 return (ENOMEM);
1001         sin6->sin6_family = AF_INET6;
1002         sin6->sin6_len = sizeof(*sin6);
1003
1004         inp = (struct sctp_inpcb *)so->so_pcb;
1005         if (inp == NULL) {
1006                 SCTP_FREE_SONAME(sin6);
1007                 SCTP_LTRACE_ERR_RET(inp, NULL, NULL, SCTP_FROM_SCTP6_USRREQ, ECONNRESET);
1008                 return (ECONNRESET);
1009         }
1010         SCTP_INP_RLOCK(inp);
1011         sin6->sin6_port = inp->sctp_lport;
1012         if (inp->sctp_flags & SCTP_PCB_FLAGS_BOUNDALL) {
1013                 /* For the bound all case you get back 0 */
1014                 if (inp->sctp_flags & SCTP_PCB_FLAGS_CONNECTED) {
1015                         struct sctp_tcb *stcb;
1016                         struct sockaddr_in6 *sin_a6;
1017                         struct sctp_nets *net;
1018                         int fnd;
1019
1020                         stcb = LIST_FIRST(&inp->sctp_asoc_list);
1021                         if (stcb == NULL) {
1022                                 goto notConn6;
1023                         }
1024                         fnd = 0;
1025                         sin_a6 = NULL;
1026                         TAILQ_FOREACH(net, &stcb->asoc.nets, sctp_next) {
1027                                 sin_a6 = (struct sockaddr_in6 *)&net->ro._l_addr;
1028                                 if (sin_a6 == NULL)
1029                                         /* this will make coverity happy */
1030                                         continue;
1031
1032                                 if (sin_a6->sin6_family == AF_INET6) {
1033                                         fnd = 1;
1034                                         break;
1035                                 }
1036                         }
1037                         if ((!fnd) || (sin_a6 == NULL)) {
1038                                 /* punt */
1039                                 goto notConn6;
1040                         }
1041                         vrf_id = inp->def_vrf_id;
1042                         sctp_ifa = sctp_source_address_selection(inp, stcb, (sctp_route_t *) & net->ro, net, 0, vrf_id);
1043                         if (sctp_ifa) {
1044                                 sin6->sin6_addr = sctp_ifa->address.sin6.sin6_addr;
1045                         }
1046                 } else {
1047                         /* For the bound all case you get back 0 */
1048         notConn6:
1049                         memset(&sin6->sin6_addr, 0, sizeof(sin6->sin6_addr));
1050                 }
1051         } else {
1052                 /* Take the first IPv6 address in the list */
1053                 struct sctp_laddr *laddr;
1054                 int fnd = 0;
1055
1056                 LIST_FOREACH(laddr, &inp->sctp_addr_list, sctp_nxt_addr) {
1057                         if (laddr->ifa->address.sa.sa_family == AF_INET6) {
1058                                 struct sockaddr_in6 *sin_a;
1059
1060                                 sin_a = (struct sockaddr_in6 *)&laddr->ifa->address.sin6;
1061                                 sin6->sin6_addr = sin_a->sin6_addr;
1062                                 fnd = 1;
1063                                 break;
1064                         }
1065                 }
1066                 if (!fnd) {
1067                         SCTP_FREE_SONAME(sin6);
1068                         SCTP_INP_RUNLOCK(inp);
1069                         SCTP_LTRACE_ERR_RET(inp, NULL, NULL, SCTP_FROM_SCTP6_USRREQ, ENOENT);
1070                         return (ENOENT);
1071                 }
1072         }
1073         SCTP_INP_RUNLOCK(inp);
1074         /* Scoping things for v6 */
1075         if ((error = sa6_recoverscope(sin6)) != 0) {
1076                 SCTP_FREE_SONAME(sin6);
1077                 return (error);
1078         }
1079         (*addr) = (struct sockaddr *)sin6;
1080         return (0);
1081 }
1082
1083 static int
1084 sctp6_peeraddr(struct socket *so, struct sockaddr **addr)
1085 {
1086         struct sockaddr_in6 *sin6;
1087         int fnd;
1088         struct sockaddr_in6 *sin_a6;
1089         struct sctp_inpcb *inp;
1090         struct sctp_tcb *stcb;
1091         struct sctp_nets *net;
1092         int error;
1093
1094         /* Do the malloc first in case it blocks. */
1095         SCTP_MALLOC_SONAME(sin6, struct sockaddr_in6 *, sizeof *sin6);
1096         if (sin6 == NULL)
1097                 return (ENOMEM);
1098         sin6->sin6_family = AF_INET6;
1099         sin6->sin6_len = sizeof(*sin6);
1100
1101         inp = (struct sctp_inpcb *)so->so_pcb;
1102         if ((inp == NULL) ||
1103             ((inp->sctp_flags & SCTP_PCB_FLAGS_CONNECTED) == 0)) {
1104                 /* UDP type and listeners will drop out here */
1105                 SCTP_FREE_SONAME(sin6);
1106                 SCTP_LTRACE_ERR_RET(inp, NULL, NULL, SCTP_FROM_SCTP6_USRREQ, ENOTCONN);
1107                 return (ENOTCONN);
1108         }
1109         SCTP_INP_RLOCK(inp);
1110         stcb = LIST_FIRST(&inp->sctp_asoc_list);
1111         if (stcb) {
1112                 SCTP_TCB_LOCK(stcb);
1113         }
1114         SCTP_INP_RUNLOCK(inp);
1115         if (stcb == NULL) {
1116                 SCTP_FREE_SONAME(sin6);
1117                 SCTP_LTRACE_ERR_RET(inp, NULL, NULL, SCTP_FROM_SCTP6_USRREQ, ECONNRESET);
1118                 return (ECONNRESET);
1119         }
1120         fnd = 0;
1121         TAILQ_FOREACH(net, &stcb->asoc.nets, sctp_next) {
1122                 sin_a6 = (struct sockaddr_in6 *)&net->ro._l_addr;
1123                 if (sin_a6->sin6_family == AF_INET6) {
1124                         fnd = 1;
1125                         sin6->sin6_port = stcb->rport;
1126                         sin6->sin6_addr = sin_a6->sin6_addr;
1127                         break;
1128                 }
1129         }
1130         SCTP_TCB_UNLOCK(stcb);
1131         if (!fnd) {
1132                 /* No IPv4 address */
1133                 SCTP_FREE_SONAME(sin6);
1134                 SCTP_LTRACE_ERR_RET(inp, NULL, NULL, SCTP_FROM_SCTP6_USRREQ, ENOENT);
1135                 return (ENOENT);
1136         }
1137         if ((error = sa6_recoverscope(sin6)) != 0)
1138                 return (error);
1139         *addr = (struct sockaddr *)sin6;
1140         return (0);
1141 }
1142
1143 static int
1144 sctp6_in6getaddr(struct socket *so, struct sockaddr **nam)
1145 {
1146 #ifdef INET
1147         struct sockaddr *addr;
1148
1149 #endif
1150         struct in6pcb *inp6 = sotoin6pcb(so);
1151         int error;
1152
1153         if (inp6 == NULL) {
1154                 SCTP_LTRACE_ERR_RET(NULL, NULL, NULL, SCTP_FROM_SCTP6_USRREQ, EINVAL);
1155                 return (EINVAL);
1156         }
1157         /* allow v6 addresses precedence */
1158         error = sctp6_getaddr(so, nam);
1159 #ifdef INET
1160         if (error) {
1161                 /* try v4 next if v6 failed */
1162                 error = sctp_ingetaddr(so, nam);
1163                 if (error) {
1164                         return (error);
1165                 }
1166                 addr = *nam;
1167                 /* if I'm V6ONLY, convert it to v4-mapped */
1168                 if (SCTP_IPV6_V6ONLY(inp6)) {
1169                         struct sockaddr_in6 sin6;
1170
1171                         in6_sin_2_v4mapsin6((struct sockaddr_in *)addr, &sin6);
1172                         memcpy(addr, &sin6, sizeof(struct sockaddr_in6));
1173                 }
1174         }
1175 #endif
1176         return (error);
1177 }
1178
1179
1180 static int
1181 sctp6_getpeeraddr(struct socket *so, struct sockaddr **nam)
1182 {
1183 #ifdef INET
1184         struct sockaddr *addr;
1185
1186 #endif
1187         struct in6pcb *inp6 = sotoin6pcb(so);
1188         int error;
1189
1190         if (inp6 == NULL) {
1191                 SCTP_LTRACE_ERR_RET(NULL, NULL, NULL, SCTP_FROM_SCTP6_USRREQ, EINVAL);
1192                 return (EINVAL);
1193         }
1194         /* allow v6 addresses precedence */
1195         error = sctp6_peeraddr(so, nam);
1196 #ifdef INET
1197         if (error) {
1198                 /* try v4 next if v6 failed */
1199                 error = sctp_peeraddr(so, nam);
1200                 if (error) {
1201                         return (error);
1202                 }
1203                 addr = *nam;
1204                 /* if I'm V6ONLY, convert it to v4-mapped */
1205                 if (SCTP_IPV6_V6ONLY(inp6)) {
1206                         struct sockaddr_in6 sin6;
1207
1208                         in6_sin_2_v4mapsin6((struct sockaddr_in *)addr, &sin6);
1209                         memcpy(addr, &sin6, sizeof(struct sockaddr_in6));
1210                 }
1211         }
1212 #endif
1213         return (error);
1214 }
1215
1216 struct pr_usrreqs sctp6_usrreqs = {
1217         .pru_abort = sctp6_abort,
1218         .pru_accept = sctp_accept,
1219         .pru_attach = sctp6_attach,
1220         .pru_bind = sctp6_bind,
1221         .pru_connect = sctp6_connect,
1222         .pru_control = in6_control,
1223         .pru_close = sctp6_close,
1224         .pru_detach = sctp6_close,
1225         .pru_sopoll = sopoll_generic,
1226         .pru_flush = sctp_flush,
1227         .pru_disconnect = sctp6_disconnect,
1228         .pru_listen = sctp_listen,
1229         .pru_peeraddr = sctp6_getpeeraddr,
1230         .pru_send = sctp6_send,
1231         .pru_shutdown = sctp_shutdown,
1232         .pru_sockaddr = sctp6_in6getaddr,
1233         .pru_sosend = sctp_sosend,
1234         .pru_soreceive = sctp_soreceive
1235 };
1236
1237 #endif