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MFC r276914:
[FreeBSD/stable/10.git] / sys / netinet6 / sctp6_usrreq.c
1 /*-
2  * Copyright (c) 2001-2007, by Cisco Systems, Inc. All rights reserved.
3  * Copyright (c) 2008-2012, by Randall Stewart. All rights reserved.
4  * Copyright (c) 2008-2012, by Michael Tuexen. All rights reserved.
5  *
6  * Redistribution and use in source and binary forms, with or without
7  * modification, are permitted provided that the following conditions are met:
8  *
9  * a) Redistributions of source code must retain the above copyright notice,
10  *    this list of conditions and the following disclaimer.
11  *
12  * b) Redistributions in binary form must reproduce the above copyright
13  *    notice, this list of conditions and the following disclaimer in
14  *    the documentation and/or other materials provided with the distribution.
15  *
16  * c) Neither the name of Cisco Systems, Inc. nor the names of its
17  *    contributors may be used to endorse or promote products derived
18  *    from this software without specific prior written permission.
19  *
20  * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
21  * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO,
22  * THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
23  * ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR CONTRIBUTORS BE
24  * LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
25  * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
26  * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
27  * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
28  * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
29  * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF
30  * THE POSSIBILITY OF SUCH DAMAGE.
31  */
32
33 #include <sys/cdefs.h>
34 __FBSDID("$FreeBSD$");
35
36 #include <netinet/sctp_os.h>
37 #ifdef INET6
38 #include <sys/proc.h>
39 #include <netinet/sctp_pcb.h>
40 #include <netinet/sctp_header.h>
41 #include <netinet/sctp_var.h>
42 #ifdef INET6
43 #include <netinet6/sctp6_var.h>
44 #endif
45 #include <netinet/sctp_sysctl.h>
46 #include <netinet/sctp_output.h>
47 #include <netinet/sctp_uio.h>
48 #include <netinet/sctp_asconf.h>
49 #include <netinet/sctputil.h>
50 #include <netinet/sctp_indata.h>
51 #include <netinet/sctp_timer.h>
52 #include <netinet/sctp_auth.h>
53 #include <netinet/sctp_input.h>
54 #include <netinet/sctp_output.h>
55 #include <netinet/sctp_bsd_addr.h>
56 #include <netinet/sctp_crc32.h>
57 #include <netinet/udp.h>
58
59 #ifdef IPSEC
60 #include <netipsec/ipsec.h>
61 #ifdef INET6
62 #include <netipsec/ipsec6.h>
63 #endif                          /* INET6 */
64 #endif                          /* IPSEC */
65
66 extern struct protosw inetsw[];
67
68 int
69 sctp6_input_with_port(struct mbuf **i_pak, int *offp, uint16_t port)
70 {
71         struct mbuf *m;
72         int iphlen;
73         uint32_t vrf_id;
74         uint8_t ecn_bits;
75         struct sockaddr_in6 src, dst;
76         struct ip6_hdr *ip6;
77         struct sctphdr *sh;
78         struct sctp_chunkhdr *ch;
79         int length, offset;
80
81 #if !defined(SCTP_WITH_NO_CSUM)
82         uint8_t compute_crc;
83
84 #endif
85         uint32_t mflowid;
86         uint8_t mflowtype;
87
88         iphlen = *offp;
89         if (SCTP_GET_PKT_VRFID(*i_pak, vrf_id)) {
90                 SCTP_RELEASE_PKT(*i_pak);
91                 return (IPPROTO_DONE);
92         }
93         m = SCTP_HEADER_TO_CHAIN(*i_pak);
94 #ifdef SCTP_MBUF_LOGGING
95         /* Log in any input mbufs */
96         if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_MBUF_LOGGING_ENABLE) {
97                 sctp_log_mbc(m, SCTP_MBUF_INPUT);
98         }
99 #endif
100 #ifdef SCTP_PACKET_LOGGING
101         if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_LAST_PACKET_TRACING) {
102                 sctp_packet_log(m);
103         }
104 #endif
105         SCTPDBG(SCTP_DEBUG_CRCOFFLOAD,
106             "sctp6_input(): Packet of length %d received on %s with csum_flags 0x%b.\n",
107             m->m_pkthdr.len,
108             if_name(m->m_pkthdr.rcvif),
109             (int)m->m_pkthdr.csum_flags, CSUM_BITS);
110         mflowid = m->m_pkthdr.flowid;
111         mflowtype = M_HASHTYPE_GET(m);
112         SCTP_STAT_INCR(sctps_recvpackets);
113         SCTP_STAT_INCR_COUNTER64(sctps_inpackets);
114         /* Get IP, SCTP, and first chunk header together in the first mbuf. */
115         offset = iphlen + sizeof(struct sctphdr) + sizeof(struct sctp_chunkhdr);
116         ip6 = mtod(m, struct ip6_hdr *);
117         IP6_EXTHDR_GET(sh, struct sctphdr *, m, iphlen,
118             (int)(sizeof(struct sctphdr) + sizeof(struct sctp_chunkhdr)));
119         if (sh == NULL) {
120                 SCTP_STAT_INCR(sctps_hdrops);
121                 return (IPPROTO_DONE);
122         }
123         ch = (struct sctp_chunkhdr *)((caddr_t)sh + sizeof(struct sctphdr));
124         offset -= sizeof(struct sctp_chunkhdr);
125         memset(&src, 0, sizeof(struct sockaddr_in6));
126         src.sin6_family = AF_INET6;
127         src.sin6_len = sizeof(struct sockaddr_in6);
128         src.sin6_port = sh->src_port;
129         src.sin6_addr = ip6->ip6_src;
130         if (in6_setscope(&src.sin6_addr, m->m_pkthdr.rcvif, NULL) != 0) {
131                 goto out;
132         }
133         memset(&dst, 0, sizeof(struct sockaddr_in6));
134         dst.sin6_family = AF_INET6;
135         dst.sin6_len = sizeof(struct sockaddr_in6);
136         dst.sin6_port = sh->dest_port;
137         dst.sin6_addr = ip6->ip6_dst;
138         if (in6_setscope(&dst.sin6_addr, m->m_pkthdr.rcvif, NULL) != 0) {
139                 goto out;
140         }
141         if (faithprefix_p != NULL && (*faithprefix_p) (&dst.sin6_addr)) {
142                 /* XXX send icmp6 host/port unreach? */
143                 goto out;
144         }
145         length = ntohs(ip6->ip6_plen) + iphlen;
146         /* Validate mbuf chain length with IP payload length. */
147         if (SCTP_HEADER_LEN(m) != length) {
148                 SCTPDBG(SCTP_DEBUG_INPUT1,
149                     "sctp6_input() length:%d reported length:%d\n", length, SCTP_HEADER_LEN(m));
150                 SCTP_STAT_INCR(sctps_hdrops);
151                 goto out;
152         }
153         if (IN6_IS_ADDR_MULTICAST(&ip6->ip6_dst)) {
154                 goto out;
155         }
156         ecn_bits = ((ntohl(ip6->ip6_flow) >> 20) & 0x000000ff);
157 #if defined(SCTP_WITH_NO_CSUM)
158         SCTP_STAT_INCR(sctps_recvnocrc);
159 #else
160         if (m->m_pkthdr.csum_flags & CSUM_SCTP_VALID) {
161                 SCTP_STAT_INCR(sctps_recvhwcrc);
162                 compute_crc = 0;
163         } else {
164                 SCTP_STAT_INCR(sctps_recvswcrc);
165                 compute_crc = 1;
166         }
167 #endif
168         sctp_common_input_processing(&m, iphlen, offset, length,
169             (struct sockaddr *)&src,
170             (struct sockaddr *)&dst,
171             sh, ch,
172 #if !defined(SCTP_WITH_NO_CSUM)
173             compute_crc,
174 #endif
175             ecn_bits,
176             mflowtype, mflowid,
177             vrf_id, port);
178 out:
179         if (m) {
180                 sctp_m_freem(m);
181         }
182         return (IPPROTO_DONE);
183 }
184
185
186 int
187 sctp6_input(struct mbuf **i_pak, int *offp, int proto SCTP_UNUSED)
188 {
189         return (sctp6_input_with_port(i_pak, offp, 0));
190 }
191
192 static void
193 sctp6_notify_mbuf(struct sctp_inpcb *inp, struct icmp6_hdr *icmp6,
194     struct sctphdr *sh, struct sctp_tcb *stcb, struct sctp_nets *net)
195 {
196         uint32_t nxtsz;
197
198         if ((inp == NULL) || (stcb == NULL) || (net == NULL) ||
199             (icmp6 == NULL) || (sh == NULL)) {
200                 goto out;
201         }
202         /* First do we even look at it? */
203         if (ntohl(sh->v_tag) != (stcb->asoc.peer_vtag))
204                 goto out;
205
206         if (icmp6->icmp6_type != ICMP6_PACKET_TOO_BIG) {
207                 /* not PACKET TO BIG */
208                 goto out;
209         }
210         /*
211          * ok we need to look closely. We could even get smarter and look at
212          * anyone that we sent to in case we get a different ICMP that tells
213          * us there is no way to reach a host, but for this impl, all we
214          * care about is MTU discovery.
215          */
216         nxtsz = ntohl(icmp6->icmp6_mtu);
217         /* Stop any PMTU timer */
218         sctp_timer_stop(SCTP_TIMER_TYPE_PATHMTURAISE, inp, stcb, NULL, SCTP_FROM_SCTP6_USRREQ + SCTP_LOC_1);
219
220         /* Adjust destination size limit */
221         if (net->mtu > nxtsz) {
222                 net->mtu = nxtsz;
223                 if (net->port) {
224                         net->mtu -= sizeof(struct udphdr);
225                 }
226         }
227         /* now what about the ep? */
228         if (stcb->asoc.smallest_mtu > nxtsz) {
229                 struct sctp_tmit_chunk *chk;
230
231                 /* Adjust that too */
232                 stcb->asoc.smallest_mtu = nxtsz;
233                 /* now off to subtract IP_DF flag if needed */
234
235                 TAILQ_FOREACH(chk, &stcb->asoc.send_queue, sctp_next) {
236                         if ((uint32_t) (chk->send_size + IP_HDR_SIZE) > nxtsz) {
237                                 chk->flags |= CHUNK_FLAGS_FRAGMENT_OK;
238                         }
239                 }
240                 TAILQ_FOREACH(chk, &stcb->asoc.sent_queue, sctp_next) {
241                         if ((uint32_t) (chk->send_size + IP_HDR_SIZE) > nxtsz) {
242                                 /*
243                                  * For this guy we also mark for immediate
244                                  * resend since we sent to big of chunk
245                                  */
246                                 chk->flags |= CHUNK_FLAGS_FRAGMENT_OK;
247                                 if (chk->sent != SCTP_DATAGRAM_RESEND)
248                                         stcb->asoc.sent_queue_retran_cnt++;
249                                 chk->sent = SCTP_DATAGRAM_RESEND;
250                                 chk->rec.data.doing_fast_retransmit = 0;
251
252                                 chk->sent = SCTP_DATAGRAM_RESEND;
253                                 /* Clear any time so NO RTT is being done */
254                                 chk->sent_rcv_time.tv_sec = 0;
255                                 chk->sent_rcv_time.tv_usec = 0;
256                                 stcb->asoc.total_flight -= chk->send_size;
257                                 net->flight_size -= chk->send_size;
258                         }
259                 }
260         }
261         sctp_timer_start(SCTP_TIMER_TYPE_PATHMTURAISE, inp, stcb, NULL);
262 out:
263         if (stcb) {
264                 SCTP_TCB_UNLOCK(stcb);
265         }
266 }
267
268
269 void
270 sctp6_notify(struct sctp_inpcb *inp,
271     struct icmp6_hdr *icmph,
272     struct sctphdr *sh,
273     struct sockaddr *to,
274     struct sctp_tcb *stcb,
275     struct sctp_nets *net)
276 {
277 #if defined(__APPLE__) || defined(SCTP_SO_LOCK_TESTING)
278         struct socket *so;
279
280 #endif
281
282         /* protection */
283         if ((inp == NULL) || (stcb == NULL) || (net == NULL) ||
284             (sh == NULL) || (to == NULL)) {
285                 if (stcb)
286                         SCTP_TCB_UNLOCK(stcb);
287                 return;
288         }
289         /* First job is to verify the vtag matches what I would send */
290         if (ntohl(sh->v_tag) != (stcb->asoc.peer_vtag)) {
291                 SCTP_TCB_UNLOCK(stcb);
292                 return;
293         }
294         if (icmph->icmp6_type != ICMP_UNREACH) {
295                 /* We only care about unreachable */
296                 SCTP_TCB_UNLOCK(stcb);
297                 return;
298         }
299         if ((icmph->icmp6_code == ICMP_UNREACH_NET) ||
300             (icmph->icmp6_code == ICMP_UNREACH_HOST) ||
301             (icmph->icmp6_code == ICMP_UNREACH_NET_UNKNOWN) ||
302             (icmph->icmp6_code == ICMP_UNREACH_HOST_UNKNOWN) ||
303             (icmph->icmp6_code == ICMP_UNREACH_ISOLATED) ||
304             (icmph->icmp6_code == ICMP_UNREACH_NET_PROHIB) ||
305             (icmph->icmp6_code == ICMP_UNREACH_HOST_PROHIB) ||
306             (icmph->icmp6_code == ICMP_UNREACH_FILTER_PROHIB)) {
307
308                 /*
309                  * Hmm reachablity problems we must examine closely. If its
310                  * not reachable, we may have lost a network. Or if there is
311                  * NO protocol at the other end named SCTP. well we consider
312                  * it a OOTB abort.
313                  */
314                 if (net->dest_state & SCTP_ADDR_REACHABLE) {
315                         /* Ok that destination is NOT reachable */
316                         net->dest_state &= ~SCTP_ADDR_REACHABLE;
317                         net->dest_state &= ~SCTP_ADDR_PF;
318                         sctp_ulp_notify(SCTP_NOTIFY_INTERFACE_DOWN,
319                             stcb, 0, (void *)net, SCTP_SO_NOT_LOCKED);
320                 }
321                 SCTP_TCB_UNLOCK(stcb);
322         } else if ((icmph->icmp6_code == ICMP_UNREACH_PROTOCOL) ||
323             (icmph->icmp6_code == ICMP_UNREACH_PORT)) {
324                 /*
325                  * Here the peer is either playing tricks on us, including
326                  * an address that belongs to someone who does not support
327                  * SCTP OR was a userland implementation that shutdown and
328                  * now is dead. In either case treat it like a OOTB abort
329                  * with no TCB
330                  */
331                 sctp_abort_notification(stcb, 1, 0, NULL, SCTP_SO_NOT_LOCKED);
332 #if defined(__APPLE__) || defined(SCTP_SO_LOCK_TESTING)
333                 so = SCTP_INP_SO(inp);
334                 atomic_add_int(&stcb->asoc.refcnt, 1);
335                 SCTP_TCB_UNLOCK(stcb);
336                 SCTP_SOCKET_LOCK(so, 1);
337                 SCTP_TCB_LOCK(stcb);
338                 atomic_subtract_int(&stcb->asoc.refcnt, 1);
339 #endif
340                 (void)sctp_free_assoc(inp, stcb, SCTP_NORMAL_PROC, SCTP_FROM_SCTP_USRREQ + SCTP_LOC_2);
341 #if defined(__APPLE__) || defined(SCTP_SO_LOCK_TESTING)
342                 SCTP_SOCKET_UNLOCK(so, 1);
343                 /* SCTP_TCB_UNLOCK(stcb); MT: I think this is not needed. */
344 #endif
345                 /* no need to unlock here, since the TCB is gone */
346         } else {
347                 SCTP_TCB_UNLOCK(stcb);
348         }
349 }
350
351
352
353 void
354 sctp6_ctlinput(int cmd, struct sockaddr *pktdst, void *d)
355 {
356         struct sctphdr sh;
357         struct ip6ctlparam *ip6cp = NULL;
358         uint32_t vrf_id;
359
360         vrf_id = SCTP_DEFAULT_VRFID;
361
362         if (pktdst->sa_family != AF_INET6 ||
363             pktdst->sa_len != sizeof(struct sockaddr_in6))
364                 return;
365
366         if ((unsigned)cmd >= PRC_NCMDS)
367                 return;
368         if (PRC_IS_REDIRECT(cmd)) {
369                 d = NULL;
370         } else if (inet6ctlerrmap[cmd] == 0) {
371                 return;
372         }
373         /* if the parameter is from icmp6, decode it. */
374         if (d != NULL) {
375                 ip6cp = (struct ip6ctlparam *)d;
376         } else {
377                 ip6cp = (struct ip6ctlparam *)NULL;
378         }
379
380         if (ip6cp) {
381                 /*
382                  * XXX: We assume that when IPV6 is non NULL, M and OFF are
383                  * valid.
384                  */
385                 /* check if we can safely examine src and dst ports */
386                 struct sctp_inpcb *inp = NULL;
387                 struct sctp_tcb *stcb = NULL;
388                 struct sctp_nets *net = NULL;
389                 struct sockaddr_in6 final;
390
391                 if (ip6cp->ip6c_m == NULL)
392                         return;
393
394                 bzero(&sh, sizeof(sh));
395                 bzero(&final, sizeof(final));
396                 inp = NULL;
397                 net = NULL;
398                 m_copydata(ip6cp->ip6c_m, ip6cp->ip6c_off, sizeof(sh),
399                     (caddr_t)&sh);
400                 ip6cp->ip6c_src->sin6_port = sh.src_port;
401                 final.sin6_len = sizeof(final);
402                 final.sin6_family = AF_INET6;
403                 final.sin6_addr = ((struct sockaddr_in6 *)pktdst)->sin6_addr;
404                 final.sin6_port = sh.dest_port;
405                 stcb = sctp_findassociation_addr_sa((struct sockaddr *)&final,
406                     (struct sockaddr *)ip6cp->ip6c_src,
407                     &inp, &net, 1, vrf_id);
408                 /* inp's ref-count increased && stcb locked */
409                 if (stcb != NULL && inp && (inp->sctp_socket != NULL)) {
410                         if (cmd == PRC_MSGSIZE) {
411                                 sctp6_notify_mbuf(inp,
412                                     ip6cp->ip6c_icmp6,
413                                     &sh,
414                                     stcb,
415                                     net);
416                                 /* inp's ref-count reduced && stcb unlocked */
417                         } else {
418                                 sctp6_notify(inp, ip6cp->ip6c_icmp6, &sh,
419                                     (struct sockaddr *)&final,
420                                     stcb, net);
421                                 /* inp's ref-count reduced && stcb unlocked */
422                         }
423                 } else {
424                         if (PRC_IS_REDIRECT(cmd) && inp) {
425                                 in6_rtchange((struct in6pcb *)inp,
426                                     inet6ctlerrmap[cmd]);
427                         }
428                         if (inp) {
429                                 /* reduce inp's ref-count */
430                                 SCTP_INP_WLOCK(inp);
431                                 SCTP_INP_DECR_REF(inp);
432                                 SCTP_INP_WUNLOCK(inp);
433                         }
434                         if (stcb)
435                                 SCTP_TCB_UNLOCK(stcb);
436                 }
437         }
438 }
439
440 /*
441  * this routine can probably be collasped into the one in sctp_userreq.c
442  * since they do the same thing and now we lookup with a sockaddr
443  */
444 static int
445 sctp6_getcred(SYSCTL_HANDLER_ARGS)
446 {
447         struct xucred xuc;
448         struct sockaddr_in6 addrs[2];
449         struct sctp_inpcb *inp;
450         struct sctp_nets *net;
451         struct sctp_tcb *stcb;
452         int error;
453         uint32_t vrf_id;
454
455         vrf_id = SCTP_DEFAULT_VRFID;
456
457         error = priv_check(req->td, PRIV_NETINET_GETCRED);
458         if (error)
459                 return (error);
460
461         if (req->newlen != sizeof(addrs)) {
462                 SCTP_LTRACE_ERR_RET(NULL, NULL, NULL, SCTP_FROM_SCTP6_USRREQ, EINVAL);
463                 return (EINVAL);
464         }
465         if (req->oldlen != sizeof(struct ucred)) {
466                 SCTP_LTRACE_ERR_RET(NULL, NULL, NULL, SCTP_FROM_SCTP6_USRREQ, EINVAL);
467                 return (EINVAL);
468         }
469         error = SYSCTL_IN(req, addrs, sizeof(addrs));
470         if (error)
471                 return (error);
472
473         stcb = sctp_findassociation_addr_sa(sin6tosa(&addrs[1]),
474             sin6tosa(&addrs[0]),
475             &inp, &net, 1, vrf_id);
476         if (stcb == NULL || inp == NULL || inp->sctp_socket == NULL) {
477                 if ((inp != NULL) && (stcb == NULL)) {
478                         /* reduce ref-count */
479                         SCTP_INP_WLOCK(inp);
480                         SCTP_INP_DECR_REF(inp);
481                         goto cred_can_cont;
482                 }
483                 SCTP_LTRACE_ERR_RET(inp, NULL, NULL, SCTP_FROM_SCTP6_USRREQ, ENOENT);
484                 error = ENOENT;
485                 goto out;
486         }
487         SCTP_TCB_UNLOCK(stcb);
488         /*
489          * We use the write lock here, only since in the error leg we need
490          * it. If we used RLOCK, then we would have to
491          * wlock/decr/unlock/rlock. Which in theory could create a hole.
492          * Better to use higher wlock.
493          */
494         SCTP_INP_WLOCK(inp);
495 cred_can_cont:
496         error = cr_canseesocket(req->td->td_ucred, inp->sctp_socket);
497         if (error) {
498                 SCTP_INP_WUNLOCK(inp);
499                 goto out;
500         }
501         cru2x(inp->sctp_socket->so_cred, &xuc);
502         SCTP_INP_WUNLOCK(inp);
503         error = SYSCTL_OUT(req, &xuc, sizeof(struct xucred));
504 out:
505         return (error);
506 }
507
508 SYSCTL_PROC(_net_inet6_sctp6, OID_AUTO, getcred, CTLTYPE_OPAQUE | CTLFLAG_RW,
509     0, 0,
510     sctp6_getcred, "S,ucred", "Get the ucred of a SCTP6 connection");
511
512
513 /* This is the same as the sctp_abort() could be made common */
514 static void
515 sctp6_abort(struct socket *so)
516 {
517         struct sctp_inpcb *inp;
518         uint32_t flags;
519
520         inp = (struct sctp_inpcb *)so->so_pcb;
521         if (inp == NULL) {
522                 SCTP_LTRACE_ERR_RET(inp, NULL, NULL, SCTP_FROM_SCTP6_USRREQ, EINVAL);
523                 return;
524         }
525 sctp_must_try_again:
526         flags = inp->sctp_flags;
527 #ifdef SCTP_LOG_CLOSING
528         sctp_log_closing(inp, NULL, 17);
529 #endif
530         if (((flags & SCTP_PCB_FLAGS_SOCKET_GONE) == 0) &&
531             (atomic_cmpset_int(&inp->sctp_flags, flags, (flags | SCTP_PCB_FLAGS_SOCKET_GONE | SCTP_PCB_FLAGS_CLOSE_IP)))) {
532 #ifdef SCTP_LOG_CLOSING
533                 sctp_log_closing(inp, NULL, 16);
534 #endif
535                 sctp_inpcb_free(inp, SCTP_FREE_SHOULD_USE_ABORT,
536                     SCTP_CALLED_AFTER_CMPSET_OFCLOSE);
537                 SOCK_LOCK(so);
538                 SCTP_SB_CLEAR(so->so_snd);
539                 /*
540                  * same for the rcv ones, they are only here for the
541                  * accounting/select.
542                  */
543                 SCTP_SB_CLEAR(so->so_rcv);
544                 /* Now null out the reference, we are completely detached. */
545                 so->so_pcb = NULL;
546                 SOCK_UNLOCK(so);
547         } else {
548                 flags = inp->sctp_flags;
549                 if ((flags & SCTP_PCB_FLAGS_SOCKET_GONE) == 0) {
550                         goto sctp_must_try_again;
551                 }
552         }
553         return;
554 }
555
556 static int
557 sctp6_attach(struct socket *so, int proto SCTP_UNUSED, struct thread *p SCTP_UNUSED)
558 {
559         struct in6pcb *inp6;
560         int error;
561         struct sctp_inpcb *inp;
562         uint32_t vrf_id = SCTP_DEFAULT_VRFID;
563
564         inp = (struct sctp_inpcb *)so->so_pcb;
565         if (inp != NULL) {
566                 SCTP_LTRACE_ERR_RET(inp, NULL, NULL, SCTP_FROM_SCTP6_USRREQ, EINVAL);
567                 return (EINVAL);
568         }
569         if (so->so_snd.sb_hiwat == 0 || so->so_rcv.sb_hiwat == 0) {
570                 error = SCTP_SORESERVE(so, SCTP_BASE_SYSCTL(sctp_sendspace), SCTP_BASE_SYSCTL(sctp_recvspace));
571                 if (error)
572                         return (error);
573         }
574         error = sctp_inpcb_alloc(so, vrf_id);
575         if (error)
576                 return (error);
577         inp = (struct sctp_inpcb *)so->so_pcb;
578         SCTP_INP_WLOCK(inp);
579         inp->sctp_flags |= SCTP_PCB_FLAGS_BOUND_V6;     /* I'm v6! */
580         inp6 = (struct in6pcb *)inp;
581
582         inp6->inp_vflag |= INP_IPV6;
583         inp6->in6p_hops = -1;   /* use kernel default */
584         inp6->in6p_cksum = -1;  /* just to be sure */
585 #ifdef INET
586         /*
587          * XXX: ugly!! IPv4 TTL initialization is necessary for an IPv6
588          * socket as well, because the socket may be bound to an IPv6
589          * wildcard address, which may match an IPv4-mapped IPv6 address.
590          */
591         inp6->inp_ip_ttl = MODULE_GLOBAL(ip_defttl);
592 #endif
593         /*
594          * Hmm what about the IPSEC stuff that is missing here but in
595          * sctp_attach()?
596          */
597         SCTP_INP_WUNLOCK(inp);
598         return (0);
599 }
600
601 static int
602 sctp6_bind(struct socket *so, struct sockaddr *addr, struct thread *p)
603 {
604         struct sctp_inpcb *inp;
605         struct in6pcb *inp6;
606         int error;
607
608         inp = (struct sctp_inpcb *)so->so_pcb;
609         if (inp == NULL) {
610                 SCTP_LTRACE_ERR_RET(inp, NULL, NULL, SCTP_FROM_SCTP6_USRREQ, EINVAL);
611                 return (EINVAL);
612         }
613         if (addr) {
614                 switch (addr->sa_family) {
615 #ifdef INET
616                 case AF_INET:
617                         if (addr->sa_len != sizeof(struct sockaddr_in)) {
618                                 SCTP_LTRACE_ERR_RET(inp, NULL, NULL, SCTP_FROM_SCTP6_USRREQ, EINVAL);
619                                 return (EINVAL);
620                         }
621                         break;
622 #endif
623 #ifdef INET6
624                 case AF_INET6:
625                         if (addr->sa_len != sizeof(struct sockaddr_in6)) {
626                                 SCTP_LTRACE_ERR_RET(inp, NULL, NULL, SCTP_FROM_SCTP6_USRREQ, EINVAL);
627                                 return (EINVAL);
628                         }
629                         break;
630 #endif
631                 default:
632                         SCTP_LTRACE_ERR_RET(inp, NULL, NULL, SCTP_FROM_SCTP6_USRREQ, EINVAL);
633                         return (EINVAL);
634                 }
635         }
636         inp6 = (struct in6pcb *)inp;
637         inp6->inp_vflag &= ~INP_IPV4;
638         inp6->inp_vflag |= INP_IPV6;
639         if ((addr != NULL) && (SCTP_IPV6_V6ONLY(inp6) == 0)) {
640                 switch (addr->sa_family) {
641 #ifdef INET
642                 case AF_INET:
643                         /* binding v4 addr to v6 socket, so reset flags */
644                         inp6->inp_vflag |= INP_IPV4;
645                         inp6->inp_vflag &= ~INP_IPV6;
646                         break;
647 #endif
648 #ifdef INET6
649                 case AF_INET6:
650                         {
651                                 struct sockaddr_in6 *sin6_p;
652
653                                 sin6_p = (struct sockaddr_in6 *)addr;
654
655                                 if (IN6_IS_ADDR_UNSPECIFIED(&sin6_p->sin6_addr)) {
656                                         inp6->inp_vflag |= INP_IPV4;
657                                 }
658 #ifdef INET
659                                 if (IN6_IS_ADDR_V4MAPPED(&sin6_p->sin6_addr)) {
660                                         struct sockaddr_in sin;
661
662                                         in6_sin6_2_sin(&sin, sin6_p);
663                                         inp6->inp_vflag |= INP_IPV4;
664                                         inp6->inp_vflag &= ~INP_IPV6;
665                                         error = sctp_inpcb_bind(so, (struct sockaddr *)&sin, NULL, p);
666                                         return (error);
667                                 }
668 #endif
669                                 break;
670                         }
671 #endif
672                 default:
673                         break;
674                 }
675         } else if (addr != NULL) {
676                 struct sockaddr_in6 *sin6_p;
677
678                 /* IPV6_V6ONLY socket */
679 #ifdef INET
680                 if (addr->sa_family == AF_INET) {
681                         /* can't bind v4 addr to v6 only socket! */
682                         SCTP_LTRACE_ERR_RET(inp, NULL, NULL, SCTP_FROM_SCTP6_USRREQ, EINVAL);
683                         return (EINVAL);
684                 }
685 #endif
686                 sin6_p = (struct sockaddr_in6 *)addr;
687
688                 if (IN6_IS_ADDR_V4MAPPED(&sin6_p->sin6_addr)) {
689                         /* can't bind v4-mapped addrs either! */
690                         /* NOTE: we don't support SIIT */
691                         SCTP_LTRACE_ERR_RET(inp, NULL, NULL, SCTP_FROM_SCTP6_USRREQ, EINVAL);
692                         return (EINVAL);
693                 }
694         }
695         error = sctp_inpcb_bind(so, addr, NULL, p);
696         return (error);
697 }
698
699
700 static void
701 sctp6_close(struct socket *so)
702 {
703         sctp_close(so);
704 }
705
706 /* This could be made common with sctp_detach() since they are identical */
707
708 static
709 int
710 sctp6_disconnect(struct socket *so)
711 {
712         return (sctp_disconnect(so));
713 }
714
715
716 int
717 sctp_sendm(struct socket *so, int flags, struct mbuf *m, struct sockaddr *addr,
718     struct mbuf *control, struct thread *p);
719
720
721 static int
722 sctp6_send(struct socket *so, int flags, struct mbuf *m, struct sockaddr *addr,
723     struct mbuf *control, struct thread *p)
724 {
725         struct sctp_inpcb *inp;
726         struct in6pcb *inp6;
727
728 #ifdef INET
729         struct sockaddr_in6 *sin6;
730
731 #endif                          /* INET */
732         /* No SPL needed since sctp_output does this */
733
734         inp = (struct sctp_inpcb *)so->so_pcb;
735         if (inp == NULL) {
736                 if (control) {
737                         SCTP_RELEASE_PKT(control);
738                         control = NULL;
739                 }
740                 SCTP_RELEASE_PKT(m);
741                 SCTP_LTRACE_ERR_RET(inp, NULL, NULL, SCTP_FROM_SCTP6_USRREQ, EINVAL);
742                 return (EINVAL);
743         }
744         inp6 = (struct in6pcb *)inp;
745         /*
746          * For the TCP model we may get a NULL addr, if we are a connected
747          * socket thats ok.
748          */
749         if ((inp->sctp_flags & SCTP_PCB_FLAGS_CONNECTED) &&
750             (addr == NULL)) {
751                 goto connected_type;
752         }
753         if (addr == NULL) {
754                 SCTP_RELEASE_PKT(m);
755                 if (control) {
756                         SCTP_RELEASE_PKT(control);
757                         control = NULL;
758                 }
759                 SCTP_LTRACE_ERR_RET(inp, NULL, NULL, SCTP_FROM_SCTP6_USRREQ, EDESTADDRREQ);
760                 return (EDESTADDRREQ);
761         }
762 #ifdef INET
763         sin6 = (struct sockaddr_in6 *)addr;
764         if (SCTP_IPV6_V6ONLY(inp6)) {
765                 /*
766                  * if IPV6_V6ONLY flag, we discard datagrams destined to a
767                  * v4 addr or v4-mapped addr
768                  */
769                 if (addr->sa_family == AF_INET) {
770                         SCTP_LTRACE_ERR_RET(inp, NULL, NULL, SCTP_FROM_SCTP6_USRREQ, EINVAL);
771                         return (EINVAL);
772                 }
773                 if (IN6_IS_ADDR_V4MAPPED(&sin6->sin6_addr)) {
774                         SCTP_LTRACE_ERR_RET(inp, NULL, NULL, SCTP_FROM_SCTP6_USRREQ, EINVAL);
775                         return (EINVAL);
776                 }
777         }
778         if (IN6_IS_ADDR_V4MAPPED(&sin6->sin6_addr)) {
779                 struct sockaddr_in sin;
780
781                 /* convert v4-mapped into v4 addr and send */
782                 in6_sin6_2_sin(&sin, sin6);
783                 return (sctp_sendm(so, flags, m, (struct sockaddr *)&sin, control, p));
784         }
785 #endif                          /* INET */
786 connected_type:
787         /* now what about control */
788         if (control) {
789                 if (inp->control) {
790                         SCTP_PRINTF("huh? control set?\n");
791                         SCTP_RELEASE_PKT(inp->control);
792                         inp->control = NULL;
793                 }
794                 inp->control = control;
795         }
796         /* Place the data */
797         if (inp->pkt) {
798                 SCTP_BUF_NEXT(inp->pkt_last) = m;
799                 inp->pkt_last = m;
800         } else {
801                 inp->pkt_last = inp->pkt = m;
802         }
803         if (
804         /* FreeBSD and MacOSX uses a flag passed */
805             ((flags & PRUS_MORETOCOME) == 0)
806             ) {
807                 /*
808                  * note with the current version this code will only be used
809                  * by OpenBSD, NetBSD and FreeBSD have methods for
810                  * re-defining sosend() to use sctp_sosend().  One can
811                  * optionaly switch back to this code (by changing back the
812                  * defininitions but this is not advisable.
813                  */
814                 int ret;
815
816                 ret = sctp_output(inp, inp->pkt, addr, inp->control, p, flags);
817                 inp->pkt = NULL;
818                 inp->control = NULL;
819                 return (ret);
820         } else {
821                 return (0);
822         }
823 }
824
825 static int
826 sctp6_connect(struct socket *so, struct sockaddr *addr, struct thread *p)
827 {
828         uint32_t vrf_id;
829         int error = 0;
830         struct sctp_inpcb *inp;
831         struct sctp_tcb *stcb;
832
833 #ifdef INET
834         struct in6pcb *inp6;
835         struct sockaddr_in6 *sin6;
836         union sctp_sockstore store;
837
838 #endif
839
840 #ifdef INET
841         inp6 = (struct in6pcb *)so->so_pcb;
842 #endif
843         inp = (struct sctp_inpcb *)so->so_pcb;
844         if (inp == NULL) {
845                 SCTP_LTRACE_ERR_RET(inp, NULL, NULL, SCTP_FROM_SCTP6_USRREQ, ECONNRESET);
846                 return (ECONNRESET);    /* I made the same as TCP since we are
847                                          * not setup? */
848         }
849         if (addr == NULL) {
850                 SCTP_LTRACE_ERR_RET(inp, NULL, NULL, SCTP_FROM_SCTP6_USRREQ, EINVAL);
851                 return (EINVAL);
852         }
853         switch (addr->sa_family) {
854 #ifdef INET
855         case AF_INET:
856                 if (addr->sa_len != sizeof(struct sockaddr_in)) {
857                         SCTP_LTRACE_ERR_RET(inp, NULL, NULL, SCTP_FROM_SCTP6_USRREQ, EINVAL);
858                         return (EINVAL);
859                 }
860                 break;
861 #endif
862 #ifdef INET6
863         case AF_INET6:
864                 if (addr->sa_len != sizeof(struct sockaddr_in6)) {
865                         SCTP_LTRACE_ERR_RET(inp, NULL, NULL, SCTP_FROM_SCTP6_USRREQ, EINVAL);
866                         return (EINVAL);
867                 }
868                 break;
869 #endif
870         default:
871                 SCTP_LTRACE_ERR_RET(inp, NULL, NULL, SCTP_FROM_SCTP6_USRREQ, EINVAL);
872                 return (EINVAL);
873         }
874
875         vrf_id = inp->def_vrf_id;
876         SCTP_ASOC_CREATE_LOCK(inp);
877         SCTP_INP_RLOCK(inp);
878         if ((inp->sctp_flags & SCTP_PCB_FLAGS_UNBOUND) ==
879             SCTP_PCB_FLAGS_UNBOUND) {
880                 /* Bind a ephemeral port */
881                 SCTP_INP_RUNLOCK(inp);
882                 error = sctp6_bind(so, NULL, p);
883                 if (error) {
884                         SCTP_ASOC_CREATE_UNLOCK(inp);
885
886                         return (error);
887                 }
888                 SCTP_INP_RLOCK(inp);
889         }
890         if ((inp->sctp_flags & SCTP_PCB_FLAGS_TCPTYPE) &&
891             (inp->sctp_flags & SCTP_PCB_FLAGS_CONNECTED)) {
892                 /* We are already connected AND the TCP model */
893                 SCTP_INP_RUNLOCK(inp);
894                 SCTP_ASOC_CREATE_UNLOCK(inp);
895                 SCTP_LTRACE_ERR_RET(inp, NULL, NULL, SCTP_FROM_SCTP6_USRREQ, EADDRINUSE);
896                 return (EADDRINUSE);
897         }
898 #ifdef INET
899         sin6 = (struct sockaddr_in6 *)addr;
900         if (SCTP_IPV6_V6ONLY(inp6)) {
901                 /*
902                  * if IPV6_V6ONLY flag, ignore connections destined to a v4
903                  * addr or v4-mapped addr
904                  */
905                 if (addr->sa_family == AF_INET) {
906                         SCTP_INP_RUNLOCK(inp);
907                         SCTP_ASOC_CREATE_UNLOCK(inp);
908                         SCTP_LTRACE_ERR_RET(inp, NULL, NULL, SCTP_FROM_SCTP6_USRREQ, EINVAL);
909                         return (EINVAL);
910                 }
911                 if (IN6_IS_ADDR_V4MAPPED(&sin6->sin6_addr)) {
912                         SCTP_INP_RUNLOCK(inp);
913                         SCTP_ASOC_CREATE_UNLOCK(inp);
914                         SCTP_LTRACE_ERR_RET(inp, NULL, NULL, SCTP_FROM_SCTP6_USRREQ, EINVAL);
915                         return (EINVAL);
916                 }
917         }
918         if (IN6_IS_ADDR_V4MAPPED(&sin6->sin6_addr)) {
919                 /* convert v4-mapped into v4 addr */
920                 in6_sin6_2_sin(&store.sin, sin6);
921                 addr = &store.sa;
922         }
923 #endif                          /* INET */
924         /* Now do we connect? */
925         if (inp->sctp_flags & SCTP_PCB_FLAGS_CONNECTED) {
926                 stcb = LIST_FIRST(&inp->sctp_asoc_list);
927                 if (stcb) {
928                         SCTP_TCB_UNLOCK(stcb);
929                 }
930                 SCTP_INP_RUNLOCK(inp);
931         } else {
932                 SCTP_INP_RUNLOCK(inp);
933                 SCTP_INP_WLOCK(inp);
934                 SCTP_INP_INCR_REF(inp);
935                 SCTP_INP_WUNLOCK(inp);
936                 stcb = sctp_findassociation_ep_addr(&inp, addr, NULL, NULL, NULL);
937                 if (stcb == NULL) {
938                         SCTP_INP_WLOCK(inp);
939                         SCTP_INP_DECR_REF(inp);
940                         SCTP_INP_WUNLOCK(inp);
941                 }
942         }
943
944         if (stcb != NULL) {
945                 /* Already have or am bring up an association */
946                 SCTP_ASOC_CREATE_UNLOCK(inp);
947                 SCTP_TCB_UNLOCK(stcb);
948                 SCTP_LTRACE_ERR_RET(inp, NULL, NULL, SCTP_FROM_SCTP6_USRREQ, EALREADY);
949                 return (EALREADY);
950         }
951         /* We are GOOD to go */
952         stcb = sctp_aloc_assoc(inp, addr, &error, 0, vrf_id, p);
953         SCTP_ASOC_CREATE_UNLOCK(inp);
954         if (stcb == NULL) {
955                 /* Gak! no memory */
956                 return (error);
957         }
958         if (stcb->sctp_ep->sctp_flags & SCTP_PCB_FLAGS_TCPTYPE) {
959                 stcb->sctp_ep->sctp_flags |= SCTP_PCB_FLAGS_CONNECTED;
960                 /* Set the connected flag so we can queue data */
961                 soisconnecting(so);
962         }
963         stcb->asoc.state = SCTP_STATE_COOKIE_WAIT;
964         (void)SCTP_GETTIME_TIMEVAL(&stcb->asoc.time_entered);
965
966         /* initialize authentication parameters for the assoc */
967         sctp_initialize_auth_params(inp, stcb);
968
969         sctp_send_initiate(inp, stcb, SCTP_SO_LOCKED);
970         SCTP_TCB_UNLOCK(stcb);
971         return (error);
972 }
973
974 static int
975 sctp6_getaddr(struct socket *so, struct sockaddr **addr)
976 {
977         struct sockaddr_in6 *sin6;
978         struct sctp_inpcb *inp;
979         uint32_t vrf_id;
980         struct sctp_ifa *sctp_ifa;
981
982         int error;
983
984         /*
985          * Do the malloc first in case it blocks.
986          */
987         SCTP_MALLOC_SONAME(sin6, struct sockaddr_in6 *, sizeof(*sin6));
988         if (sin6 == NULL)
989                 return (ENOMEM);
990         sin6->sin6_family = AF_INET6;
991         sin6->sin6_len = sizeof(*sin6);
992
993         inp = (struct sctp_inpcb *)so->so_pcb;
994         if (inp == NULL) {
995                 SCTP_FREE_SONAME(sin6);
996                 SCTP_LTRACE_ERR_RET(inp, NULL, NULL, SCTP_FROM_SCTP6_USRREQ, ECONNRESET);
997                 return (ECONNRESET);
998         }
999         SCTP_INP_RLOCK(inp);
1000         sin6->sin6_port = inp->sctp_lport;
1001         if (inp->sctp_flags & SCTP_PCB_FLAGS_BOUNDALL) {
1002                 /* For the bound all case you get back 0 */
1003                 if (inp->sctp_flags & SCTP_PCB_FLAGS_CONNECTED) {
1004                         struct sctp_tcb *stcb;
1005                         struct sockaddr_in6 *sin_a6;
1006                         struct sctp_nets *net;
1007                         int fnd;
1008
1009                         stcb = LIST_FIRST(&inp->sctp_asoc_list);
1010                         if (stcb == NULL) {
1011                                 goto notConn6;
1012                         }
1013                         fnd = 0;
1014                         sin_a6 = NULL;
1015                         TAILQ_FOREACH(net, &stcb->asoc.nets, sctp_next) {
1016                                 sin_a6 = (struct sockaddr_in6 *)&net->ro._l_addr;
1017                                 if (sin_a6 == NULL)
1018                                         /* this will make coverity happy */
1019                                         continue;
1020
1021                                 if (sin_a6->sin6_family == AF_INET6) {
1022                                         fnd = 1;
1023                                         break;
1024                                 }
1025                         }
1026                         if ((!fnd) || (sin_a6 == NULL)) {
1027                                 /* punt */
1028                                 goto notConn6;
1029                         }
1030                         vrf_id = inp->def_vrf_id;
1031                         sctp_ifa = sctp_source_address_selection(inp, stcb, (sctp_route_t *) & net->ro, net, 0, vrf_id);
1032                         if (sctp_ifa) {
1033                                 sin6->sin6_addr = sctp_ifa->address.sin6.sin6_addr;
1034                         }
1035                 } else {
1036                         /* For the bound all case you get back 0 */
1037         notConn6:
1038                         memset(&sin6->sin6_addr, 0, sizeof(sin6->sin6_addr));
1039                 }
1040         } else {
1041                 /* Take the first IPv6 address in the list */
1042                 struct sctp_laddr *laddr;
1043                 int fnd = 0;
1044
1045                 LIST_FOREACH(laddr, &inp->sctp_addr_list, sctp_nxt_addr) {
1046                         if (laddr->ifa->address.sa.sa_family == AF_INET6) {
1047                                 struct sockaddr_in6 *sin_a;
1048
1049                                 sin_a = &laddr->ifa->address.sin6;
1050                                 sin6->sin6_addr = sin_a->sin6_addr;
1051                                 fnd = 1;
1052                                 break;
1053                         }
1054                 }
1055                 if (!fnd) {
1056                         SCTP_FREE_SONAME(sin6);
1057                         SCTP_INP_RUNLOCK(inp);
1058                         SCTP_LTRACE_ERR_RET(inp, NULL, NULL, SCTP_FROM_SCTP6_USRREQ, ENOENT);
1059                         return (ENOENT);
1060                 }
1061         }
1062         SCTP_INP_RUNLOCK(inp);
1063         /* Scoping things for v6 */
1064         if ((error = sa6_recoverscope(sin6)) != 0) {
1065                 SCTP_FREE_SONAME(sin6);
1066                 return (error);
1067         }
1068         (*addr) = (struct sockaddr *)sin6;
1069         return (0);
1070 }
1071
1072 static int
1073 sctp6_peeraddr(struct socket *so, struct sockaddr **addr)
1074 {
1075         struct sockaddr_in6 *sin6;
1076         int fnd;
1077         struct sockaddr_in6 *sin_a6;
1078         struct sctp_inpcb *inp;
1079         struct sctp_tcb *stcb;
1080         struct sctp_nets *net;
1081         int error;
1082
1083         /* Do the malloc first in case it blocks. */
1084         SCTP_MALLOC_SONAME(sin6, struct sockaddr_in6 *, sizeof *sin6);
1085         if (sin6 == NULL)
1086                 return (ENOMEM);
1087         sin6->sin6_family = AF_INET6;
1088         sin6->sin6_len = sizeof(*sin6);
1089
1090         inp = (struct sctp_inpcb *)so->so_pcb;
1091         if ((inp == NULL) ||
1092             ((inp->sctp_flags & SCTP_PCB_FLAGS_CONNECTED) == 0)) {
1093                 /* UDP type and listeners will drop out here */
1094                 SCTP_FREE_SONAME(sin6);
1095                 SCTP_LTRACE_ERR_RET(inp, NULL, NULL, SCTP_FROM_SCTP6_USRREQ, ENOTCONN);
1096                 return (ENOTCONN);
1097         }
1098         SCTP_INP_RLOCK(inp);
1099         stcb = LIST_FIRST(&inp->sctp_asoc_list);
1100         if (stcb) {
1101                 SCTP_TCB_LOCK(stcb);
1102         }
1103         SCTP_INP_RUNLOCK(inp);
1104         if (stcb == NULL) {
1105                 SCTP_FREE_SONAME(sin6);
1106                 SCTP_LTRACE_ERR_RET(inp, NULL, NULL, SCTP_FROM_SCTP6_USRREQ, ECONNRESET);
1107                 return (ECONNRESET);
1108         }
1109         fnd = 0;
1110         TAILQ_FOREACH(net, &stcb->asoc.nets, sctp_next) {
1111                 sin_a6 = (struct sockaddr_in6 *)&net->ro._l_addr;
1112                 if (sin_a6->sin6_family == AF_INET6) {
1113                         fnd = 1;
1114                         sin6->sin6_port = stcb->rport;
1115                         sin6->sin6_addr = sin_a6->sin6_addr;
1116                         break;
1117                 }
1118         }
1119         SCTP_TCB_UNLOCK(stcb);
1120         if (!fnd) {
1121                 /* No IPv4 address */
1122                 SCTP_FREE_SONAME(sin6);
1123                 SCTP_LTRACE_ERR_RET(inp, NULL, NULL, SCTP_FROM_SCTP6_USRREQ, ENOENT);
1124                 return (ENOENT);
1125         }
1126         if ((error = sa6_recoverscope(sin6)) != 0) {
1127                 SCTP_FREE_SONAME(sin6);
1128                 SCTP_LTRACE_ERR_RET(inp, NULL, NULL, SCTP_FROM_SCTP6_USRREQ, error);
1129                 return (error);
1130         }
1131         *addr = (struct sockaddr *)sin6;
1132         return (0);
1133 }
1134
1135 static int
1136 sctp6_in6getaddr(struct socket *so, struct sockaddr **nam)
1137 {
1138 #ifdef INET
1139         struct sockaddr *addr;
1140
1141 #endif
1142         struct in6pcb *inp6 = sotoin6pcb(so);
1143         int error;
1144
1145         if (inp6 == NULL) {
1146                 SCTP_LTRACE_ERR_RET(NULL, NULL, NULL, SCTP_FROM_SCTP6_USRREQ, EINVAL);
1147                 return (EINVAL);
1148         }
1149         /* allow v6 addresses precedence */
1150         error = sctp6_getaddr(so, nam);
1151 #ifdef INET
1152         if (error) {
1153                 /* try v4 next if v6 failed */
1154                 error = sctp_ingetaddr(so, nam);
1155                 if (error) {
1156                         return (error);
1157                 }
1158                 addr = *nam;
1159                 /* if I'm V6ONLY, convert it to v4-mapped */
1160                 if (SCTP_IPV6_V6ONLY(inp6)) {
1161                         struct sockaddr_in6 sin6;
1162
1163                         in6_sin_2_v4mapsin6((struct sockaddr_in *)addr, &sin6);
1164                         memcpy(addr, &sin6, sizeof(struct sockaddr_in6));
1165                 }
1166         }
1167 #endif
1168         return (error);
1169 }
1170
1171
1172 static int
1173 sctp6_getpeeraddr(struct socket *so, struct sockaddr **nam)
1174 {
1175 #ifdef INET
1176         struct sockaddr *addr;
1177
1178 #endif
1179         struct in6pcb *inp6 = sotoin6pcb(so);
1180         int error;
1181
1182         if (inp6 == NULL) {
1183                 SCTP_LTRACE_ERR_RET(NULL, NULL, NULL, SCTP_FROM_SCTP6_USRREQ, EINVAL);
1184                 return (EINVAL);
1185         }
1186         /* allow v6 addresses precedence */
1187         error = sctp6_peeraddr(so, nam);
1188 #ifdef INET
1189         if (error) {
1190                 /* try v4 next if v6 failed */
1191                 error = sctp_peeraddr(so, nam);
1192                 if (error) {
1193                         return (error);
1194                 }
1195                 addr = *nam;
1196                 /* if I'm V6ONLY, convert it to v4-mapped */
1197                 if (SCTP_IPV6_V6ONLY(inp6)) {
1198                         struct sockaddr_in6 sin6;
1199
1200                         in6_sin_2_v4mapsin6((struct sockaddr_in *)addr, &sin6);
1201                         memcpy(addr, &sin6, sizeof(struct sockaddr_in6));
1202                 }
1203         }
1204 #endif
1205         return (error);
1206 }
1207
1208 struct pr_usrreqs sctp6_usrreqs = {
1209         .pru_abort = sctp6_abort,
1210         .pru_accept = sctp_accept,
1211         .pru_attach = sctp6_attach,
1212         .pru_bind = sctp6_bind,
1213         .pru_connect = sctp6_connect,
1214         .pru_control = in6_control,
1215         .pru_close = sctp6_close,
1216         .pru_detach = sctp6_close,
1217         .pru_sopoll = sopoll_generic,
1218         .pru_flush = sctp_flush,
1219         .pru_disconnect = sctp6_disconnect,
1220         .pru_listen = sctp_listen,
1221         .pru_peeraddr = sctp6_getpeeraddr,
1222         .pru_send = sctp6_send,
1223         .pru_shutdown = sctp_shutdown,
1224         .pru_sockaddr = sctp6_in6getaddr,
1225         .pru_sosend = sctp_sosend,
1226         .pru_soreceive = sctp_soreceive
1227 };
1228
1229 #endif