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