1 /*-
2 * Copyright (c) 2001-2007, by Cisco Systems, Inc. All rights reserved.
3 * Copyright (c) 2008-2012, by Randall Stewart. All rights reserved.
4 * Copyright (c) 2008-2012, by Michael Tuexen. All rights reserved.
5 *
6 * Redistribution and use in source and binary forms, with or without
7 * modification, are permitted provided that the following conditions are met:
8 *
9 * a) Redistributions of source code must retain the above copyright notice,
10 * this list of conditions and the following disclaimer.
11 *
12 * b) Redistributions in binary form must reproduce the above copyright
13 * notice, this list of conditions and the following disclaimer in
14 * the documentation and/or other materials provided with the distribution.
15 *
16 * c) Neither the name of Cisco Systems, Inc. nor the names of its
17 * contributors may be used to endorse or promote products derived
18 * from this software without specific prior written permission.
19 *
20 * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
21 * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO,
22 * THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
23 * ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR CONTRIBUTORS BE
24 * LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
25 * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
26 * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
27 * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
28 * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
29 * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF
30 * THE POSSIBILITY OF SUCH DAMAGE.
31 */
32
33 #include <sys/cdefs.h>
34 __FBSDID("$FreeBSD: releng/10.1/sys/netinet6/sctp6_usrreq.c 293894 2016-01-14 09:11:16Z glebius $");
35
36 #include <netinet/sctp_os.h>
37 #ifdef INET6
38 #include <sys/proc.h>
39 #include <netinet/sctp_pcb.h>
40 #include <netinet/sctp_header.h>
41 #include <netinet/sctp_var.h>
42 #ifdef INET6
43 #include <netinet6/sctp6_var.h>
44 #endif
45 #include <netinet/sctp_sysctl.h>
46 #include <netinet/sctp_output.h>
47 #include <netinet/sctp_uio.h>
48 #include <netinet/sctp_asconf.h>
49 #include <netinet/sctputil.h>
50 #include <netinet/sctp_indata.h>
51 #include <netinet/sctp_timer.h>
52 #include <netinet/sctp_auth.h>
53 #include <netinet/sctp_input.h>
54 #include <netinet/sctp_output.h>
55 #include <netinet/sctp_bsd_addr.h>
56 #include <netinet/sctp_crc32.h>
57 #include <netinet/udp.h>
58
59 #ifdef IPSEC
60 #include <netipsec/ipsec.h>
61 #ifdef INET6
62 #include <netipsec/ipsec6.h>
63 #endif /* INET6 */
64 #endif /* IPSEC */
65
66 extern struct protosw inetsw[];
67
68 int
69 sctp6_input_with_port(struct mbuf **i_pak, int *offp, uint16_t port)
70 {
71 struct mbuf *m;
72 int iphlen;
73 uint32_t vrf_id;
74 uint8_t ecn_bits;
75 struct sockaddr_in6 src, dst;
76 struct ip6_hdr *ip6;
77 struct sctphdr *sh;
78 struct sctp_chunkhdr *ch;
79 int length, offset;
80
81 #if !defined(SCTP_WITH_NO_CSUM)
82 uint8_t compute_crc;
83
84 #endif
85 uint32_t mflowid;
86 uint8_t use_mflowid;
87
88 iphlen = *offp;
89 if (SCTP_GET_PKT_VRFID(*i_pak, vrf_id)) {
90 SCTP_RELEASE_PKT(*i_pak);
91 return (IPPROTO_DONE);
92 }
93 m = SCTP_HEADER_TO_CHAIN(*i_pak);
94 #ifdef SCTP_MBUF_LOGGING
95 /* Log in any input mbufs */
96 if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_MBUF_LOGGING_ENABLE) {
97 struct mbuf *mat;
98
99 for (mat = m; mat; mat = SCTP_BUF_NEXT(mat)) {
100 if (SCTP_BUF_IS_EXTENDED(mat)) {
101 sctp_log_mb(mat, SCTP_MBUF_INPUT);
102 }
103 }
104 }
105 #endif
106 #ifdef SCTP_PACKET_LOGGING
107 if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_LAST_PACKET_TRACING) {
108 sctp_packet_log(m);
109 }
110 #endif
111 SCTPDBG(SCTP_DEBUG_CRCOFFLOAD,
112 "sctp6_input(): Packet of length %d received on %s with csum_flags 0x%b.\n",
113 m->m_pkthdr.len,
114 if_name(m->m_pkthdr.rcvif),
115 (int)m->m_pkthdr.csum_flags, CSUM_BITS);
116 if (m->m_flags & M_FLOWID) {
117 mflowid = m->m_pkthdr.flowid;
118 use_mflowid = 1;
119 } else {
120 mflowid = 0;
121 use_mflowid = 0;
122 }
123 SCTP_STAT_INCR(sctps_recvpackets);
124 SCTP_STAT_INCR_COUNTER64(sctps_inpackets);
125 /* Get IP, SCTP, and first chunk header together in the first mbuf. */
126 offset = iphlen + sizeof(struct sctphdr) + sizeof(struct sctp_chunkhdr);
127 ip6 = mtod(m, struct ip6_hdr *);
128 IP6_EXTHDR_GET(sh, struct sctphdr *, m, iphlen,
129 (int)(sizeof(struct sctphdr) + sizeof(struct sctp_chunkhdr)));
130 if (sh == NULL) {
131 SCTP_STAT_INCR(sctps_hdrops);
132 return (IPPROTO_DONE);
133 }
134 ch = (struct sctp_chunkhdr *)((caddr_t)sh + sizeof(struct sctphdr));
135 offset -= sizeof(struct sctp_chunkhdr);
136 memset(&src, 0, sizeof(struct sockaddr_in6));
137 src.sin6_family = AF_INET6;
138 src.sin6_len = sizeof(struct sockaddr_in6);
139 src.sin6_port = sh->src_port;
140 src.sin6_addr = ip6->ip6_src;
141 if (in6_setscope(&src.sin6_addr, m->m_pkthdr.rcvif, NULL) != 0) {
142 goto out;
143 }
144 memset(&dst, 0, sizeof(struct sockaddr_in6));
145 dst.sin6_family = AF_INET6;
146 dst.sin6_len = sizeof(struct sockaddr_in6);
147 dst.sin6_port = sh->dest_port;
148 dst.sin6_addr = ip6->ip6_dst;
149 if (in6_setscope(&dst.sin6_addr, m->m_pkthdr.rcvif, NULL) != 0) {
150 goto out;
151 }
152 if (faithprefix_p != NULL && (*faithprefix_p) (&dst.sin6_addr)) {
153 /* XXX send icmp6 host/port unreach? */
154 goto out;
155 }
156 length = ntohs(ip6->ip6_plen) + iphlen;
157 /* Validate mbuf chain length with IP payload length. */
158 if (SCTP_HEADER_LEN(m) != length) {
159 SCTPDBG(SCTP_DEBUG_INPUT1,
160 "sctp6_input() length:%d reported length:%d\n", length, SCTP_HEADER_LEN(m));
161 SCTP_STAT_INCR(sctps_hdrops);
162 goto out;
163 }
164 if (IN6_IS_ADDR_MULTICAST(&ip6->ip6_dst)) {
165 goto out;
166 }
167 ecn_bits = ((ntohl(ip6->ip6_flow) >> 20) & 0x000000ff);
168 #if defined(SCTP_WITH_NO_CSUM)
169 SCTP_STAT_INCR(sctps_recvnocrc);
170 #else
171 if (m->m_pkthdr.csum_flags & CSUM_SCTP_VALID) {
172 SCTP_STAT_INCR(sctps_recvhwcrc);
173 compute_crc = 0;
174 } else {
175 SCTP_STAT_INCR(sctps_recvswcrc);
176 compute_crc = 1;
177 }
178 #endif
179 sctp_common_input_processing(&m, iphlen, offset, length,
180 (struct sockaddr *)&src,
181 (struct sockaddr *)&dst,
182 sh, ch,
183 #if !defined(SCTP_WITH_NO_CSUM)
184 compute_crc,
185 #endif
186 ecn_bits,
187 use_mflowid, mflowid,
188 vrf_id, port);
189 out:
190 if (m) {
191 sctp_m_freem(m);
192 }
193 return (IPPROTO_DONE);
194 }
195
196
197 int
198 sctp6_input(struct mbuf **i_pak, int *offp, int proto SCTP_UNUSED)
199 {
200 return (sctp6_input_with_port(i_pak, offp, 0));
201 }
202
203 static void
204 sctp6_notify_mbuf(struct sctp_inpcb *inp, struct icmp6_hdr *icmp6,
205 struct sctphdr *sh, struct sctp_tcb *stcb, struct sctp_nets *net)
206 {
207 uint32_t nxtsz;
208
209 if ((inp == NULL) || (stcb == NULL) || (net == NULL) ||
210 (icmp6 == NULL) || (sh == NULL)) {
211 goto out;
212 }
213 /* First do we even look at it? */
214 if (ntohl(sh->v_tag) != (stcb->asoc.peer_vtag))
215 goto out;
216
217 if (icmp6->icmp6_type != ICMP6_PACKET_TOO_BIG) {
218 /* not PACKET TO BIG */
219 goto out;
220 }
221 /*
222 * ok we need to look closely. We could even get smarter and look at
223 * anyone that we sent to in case we get a different ICMP that tells
224 * us there is no way to reach a host, but for this impl, all we
225 * care about is MTU discovery.
226 */
227 nxtsz = ntohl(icmp6->icmp6_mtu);
228 /* Stop any PMTU timer */
229 sctp_timer_stop(SCTP_TIMER_TYPE_PATHMTURAISE, inp, stcb, NULL, SCTP_FROM_SCTP6_USRREQ + SCTP_LOC_1);
230
231 /* Adjust destination size limit */
232 if (net->mtu > nxtsz) {
233 net->mtu = nxtsz;
234 if (net->port) {
235 net->mtu -= sizeof(struct udphdr);
236 }
237 }
238 /* now what about the ep? */
239 if (stcb->asoc.smallest_mtu > nxtsz) {
240 struct sctp_tmit_chunk *chk;
241
242 /* Adjust that too */
243 stcb->asoc.smallest_mtu = nxtsz;
244 /* now off to subtract IP_DF flag if needed */
245
246 TAILQ_FOREACH(chk, &stcb->asoc.send_queue, sctp_next) {
247 if ((uint32_t) (chk->send_size + IP_HDR_SIZE) > nxtsz) {
248 chk->flags |= CHUNK_FLAGS_FRAGMENT_OK;
249 }
250 }
251 TAILQ_FOREACH(chk, &stcb->asoc.sent_queue, sctp_next) {
252 if ((uint32_t) (chk->send_size + IP_HDR_SIZE) > nxtsz) {
253 /*
254 * For this guy we also mark for immediate
255 * resend since we sent to big of chunk
256 */
257 chk->flags |= CHUNK_FLAGS_FRAGMENT_OK;
258 if (chk->sent != SCTP_DATAGRAM_RESEND)
259 stcb->asoc.sent_queue_retran_cnt++;
260 chk->sent = SCTP_DATAGRAM_RESEND;
261 chk->rec.data.doing_fast_retransmit = 0;
262
263 chk->sent = SCTP_DATAGRAM_RESEND;
264 /* Clear any time so NO RTT is being done */
265 chk->sent_rcv_time.tv_sec = 0;
266 chk->sent_rcv_time.tv_usec = 0;
267 stcb->asoc.total_flight -= chk->send_size;
268 net->flight_size -= chk->send_size;
269 }
270 }
271 }
272 sctp_timer_start(SCTP_TIMER_TYPE_PATHMTURAISE, inp, stcb, NULL);
273 out:
274 if (stcb) {
275 SCTP_TCB_UNLOCK(stcb);
276 }
277 }
278
279
280 void
281 sctp6_notify(struct sctp_inpcb *inp,
282 struct icmp6_hdr *icmph,
283 struct sctphdr *sh,
284 struct sockaddr *to,
285 struct sctp_tcb *stcb,
286 struct sctp_nets *net)
287 {
288 #if defined(__APPLE__) || defined(SCTP_SO_LOCK_TESTING)
289 struct socket *so;
290
291 #endif
292
293 /* protection */
294 if ((inp == NULL) || (stcb == NULL) || (net == NULL) ||
295 (sh == NULL) || (to == NULL)) {
296 if (stcb)
297 SCTP_TCB_UNLOCK(stcb);
298 return;
299 }
300 /* First job is to verify the vtag matches what I would send */
301 if (ntohl(sh->v_tag) != (stcb->asoc.peer_vtag)) {
302 SCTP_TCB_UNLOCK(stcb);
303 return;
304 }
305 if (icmph->icmp6_type != ICMP_UNREACH) {
306 /* We only care about unreachable */
307 SCTP_TCB_UNLOCK(stcb);
308 return;
309 }
310 if ((icmph->icmp6_code == ICMP_UNREACH_NET) ||
311 (icmph->icmp6_code == ICMP_UNREACH_HOST) ||
312 (icmph->icmp6_code == ICMP_UNREACH_NET_UNKNOWN) ||
313 (icmph->icmp6_code == ICMP_UNREACH_HOST_UNKNOWN) ||
314 (icmph->icmp6_code == ICMP_UNREACH_ISOLATED) ||
315 (icmph->icmp6_code == ICMP_UNREACH_NET_PROHIB) ||
316 (icmph->icmp6_code == ICMP_UNREACH_HOST_PROHIB) ||
317 (icmph->icmp6_code == ICMP_UNREACH_FILTER_PROHIB)) {
318
319 /*
320 * Hmm reachablity problems we must examine closely. If its
321 * not reachable, we may have lost a network. Or if there is
322 * NO protocol at the other end named SCTP. well we consider
323 * it a OOTB abort.
324 */
325 if (net->dest_state & SCTP_ADDR_REACHABLE) {
326 /* Ok that destination is NOT reachable */
327 net->dest_state &= ~SCTP_ADDR_REACHABLE;
328 net->dest_state &= ~SCTP_ADDR_PF;
329 sctp_ulp_notify(SCTP_NOTIFY_INTERFACE_DOWN,
330 stcb, 0, (void *)net, SCTP_SO_NOT_LOCKED);
331 }
332 SCTP_TCB_UNLOCK(stcb);
333 } else if ((icmph->icmp6_code == ICMP_UNREACH_PROTOCOL) ||
334 (icmph->icmp6_code == ICMP_UNREACH_PORT)) {
335 /*
336 * Here the peer is either playing tricks on us, including
337 * an address that belongs to someone who does not support
338 * SCTP OR was a userland implementation that shutdown and
339 * now is dead. In either case treat it like a OOTB abort
340 * with no TCB
341 */
342 sctp_abort_notification(stcb, 1, 0, NULL, SCTP_SO_NOT_LOCKED);
343 #if defined(__APPLE__) || defined(SCTP_SO_LOCK_TESTING)
344 so = SCTP_INP_SO(inp);
345 atomic_add_int(&stcb->asoc.refcnt, 1);
346 SCTP_TCB_UNLOCK(stcb);
347 SCTP_SOCKET_LOCK(so, 1);
348 SCTP_TCB_LOCK(stcb);
349 atomic_subtract_int(&stcb->asoc.refcnt, 1);
350 #endif
351 (void)sctp_free_assoc(inp, stcb, SCTP_NORMAL_PROC, SCTP_FROM_SCTP_USRREQ + SCTP_LOC_2);
352 #if defined(__APPLE__) || defined(SCTP_SO_LOCK_TESTING)
353 SCTP_SOCKET_UNLOCK(so, 1);
354 /* SCTP_TCB_UNLOCK(stcb); MT: I think this is not needed. */
355 #endif
356 /* no need to unlock here, since the TCB is gone */
357 } else {
358 SCTP_TCB_UNLOCK(stcb);
359 }
360 }
361
362
363
364 void
365 sctp6_ctlinput(int cmd, struct sockaddr *pktdst, void *d)
366 {
367 struct sctphdr sh;
368 struct ip6ctlparam *ip6cp = NULL;
369 uint32_t vrf_id;
370
371 vrf_id = SCTP_DEFAULT_VRFID;
372
373 if (pktdst->sa_family != AF_INET6 ||
374 pktdst->sa_len != sizeof(struct sockaddr_in6))
375 return;
376
377 if ((unsigned)cmd >= PRC_NCMDS)
378 return;
379 if (PRC_IS_REDIRECT(cmd)) {
380 d = NULL;
381 } else if (inet6ctlerrmap[cmd] == 0) {
382 return;
383 }
384 /* if the parameter is from icmp6, decode it. */
385 if (d != NULL) {
386 ip6cp = (struct ip6ctlparam *)d;
387 } else {
388 ip6cp = (struct ip6ctlparam *)NULL;
389 }
390
391 if (ip6cp) {
392 /*
393 * XXX: We assume that when IPV6 is non NULL, M and OFF are
394 * valid.
395 */
396 struct sctp_inpcb *inp = NULL;
397 struct sctp_tcb *stcb = NULL;
398 struct sctp_nets *net = NULL;
399 struct sockaddr_in6 final;
400
401 if (ip6cp->ip6c_m == NULL)
402 return;
403
404 /* Check if we can safely examine the SCTP header. */
405 if (ip6cp->ip6c_m->m_pkthdr.len < ip6cp->ip6c_off + sizeof(sh))
406 return;
407
408 bzero(&sh, sizeof(sh));
409 bzero(&final, sizeof(final));
410 inp = NULL;
411 net = NULL;
412 m_copydata(ip6cp->ip6c_m, ip6cp->ip6c_off, sizeof(sh),
413 (caddr_t)&sh);
414 ip6cp->ip6c_src->sin6_port = sh.src_port;
415 final.sin6_len = sizeof(final);
416 final.sin6_family = AF_INET6;
417 final.sin6_addr = ((struct sockaddr_in6 *)pktdst)->sin6_addr;
418 final.sin6_port = sh.dest_port;
419 stcb = sctp_findassociation_addr_sa((struct sockaddr *)&final,
420 (struct sockaddr *)ip6cp->ip6c_src,
421 &inp, &net, 1, vrf_id);
422 /* inp's ref-count increased && stcb locked */
423 if (stcb != NULL && inp && (inp->sctp_socket != NULL)) {
424 if (cmd == PRC_MSGSIZE) {
425 sctp6_notify_mbuf(inp,
426 ip6cp->ip6c_icmp6,
427 &sh,
428 stcb,
429 net);
430 /* inp's ref-count reduced && stcb unlocked */
431 } else {
432 sctp6_notify(inp, ip6cp->ip6c_icmp6, &sh,
433 (struct sockaddr *)&final,
434 stcb, net);
435 /* inp's ref-count reduced && stcb unlocked */
436 }
437 } else {
438 if (PRC_IS_REDIRECT(cmd) && inp) {
439 in6_rtchange((struct in6pcb *)inp,
440 inet6ctlerrmap[cmd]);
441 }
442 if (inp) {
443 /* reduce inp's ref-count */
444 SCTP_INP_WLOCK(inp);
445 SCTP_INP_DECR_REF(inp);
446 SCTP_INP_WUNLOCK(inp);
447 }
448 if (stcb)
449 SCTP_TCB_UNLOCK(stcb);
450 }
451 }
452 }
453
454 /*
455 * this routine can probably be collasped into the one in sctp_userreq.c
456 * since they do the same thing and now we lookup with a sockaddr
457 */
458 static int
459 sctp6_getcred(SYSCTL_HANDLER_ARGS)
460 {
461 struct xucred xuc;
462 struct sockaddr_in6 addrs[2];
463 struct sctp_inpcb *inp;
464 struct sctp_nets *net;
465 struct sctp_tcb *stcb;
466 int error;
467 uint32_t vrf_id;
468
469 vrf_id = SCTP_DEFAULT_VRFID;
470
471 error = priv_check(req->td, PRIV_NETINET_GETCRED);
472 if (error)
473 return (error);
474
475 if (req->newlen != sizeof(addrs)) {
476 SCTP_LTRACE_ERR_RET(NULL, NULL, NULL, SCTP_FROM_SCTP6_USRREQ, EINVAL);
477 return (EINVAL);
478 }
479 if (req->oldlen != sizeof(struct ucred)) {
480 SCTP_LTRACE_ERR_RET(NULL, NULL, NULL, SCTP_FROM_SCTP6_USRREQ, EINVAL);
481 return (EINVAL);
482 }
483 error = SYSCTL_IN(req, addrs, sizeof(addrs));
484 if (error)
485 return (error);
486
487 stcb = sctp_findassociation_addr_sa(sin6tosa(&addrs[1]),
488 sin6tosa(&addrs[0]),
489 &inp, &net, 1, vrf_id);
490 if (stcb == NULL || inp == NULL || inp->sctp_socket == NULL) {
491 if ((inp != NULL) && (stcb == NULL)) {
492 /* reduce ref-count */
493 SCTP_INP_WLOCK(inp);
494 SCTP_INP_DECR_REF(inp);
495 goto cred_can_cont;
496 }
497 SCTP_LTRACE_ERR_RET(inp, NULL, NULL, SCTP_FROM_SCTP6_USRREQ, ENOENT);
498 error = ENOENT;
499 goto out;
500 }
501 SCTP_TCB_UNLOCK(stcb);
502 /*
503 * We use the write lock here, only since in the error leg we need
504 * it. If we used RLOCK, then we would have to
505 * wlock/decr/unlock/rlock. Which in theory could create a hole.
506 * Better to use higher wlock.
507 */
508 SCTP_INP_WLOCK(inp);
509 cred_can_cont:
510 error = cr_canseesocket(req->td->td_ucred, inp->sctp_socket);
511 if (error) {
512 SCTP_INP_WUNLOCK(inp);
513 goto out;
514 }
515 cru2x(inp->sctp_socket->so_cred, &xuc);
516 SCTP_INP_WUNLOCK(inp);
517 error = SYSCTL_OUT(req, &xuc, sizeof(struct xucred));
518 out:
519 return (error);
520 }
521
522 SYSCTL_PROC(_net_inet6_sctp6, OID_AUTO, getcred, CTLTYPE_OPAQUE | CTLFLAG_RW,
523 0, 0,
524 sctp6_getcred, "S,ucred", "Get the ucred of a SCTP6 connection");
525
526
527 /* This is the same as the sctp_abort() could be made common */
528 static void
529 sctp6_abort(struct socket *so)
530 {
531 struct sctp_inpcb *inp;
532 uint32_t flags;
533
534 inp = (struct sctp_inpcb *)so->so_pcb;
535 if (inp == NULL) {
536 SCTP_LTRACE_ERR_RET(inp, NULL, NULL, SCTP_FROM_SCTP6_USRREQ, EINVAL);
537 return;
538 }
539 sctp_must_try_again:
540 flags = inp->sctp_flags;
541 #ifdef SCTP_LOG_CLOSING
542 sctp_log_closing(inp, NULL, 17);
543 #endif
544 if (((flags & SCTP_PCB_FLAGS_SOCKET_GONE) == 0) &&
545 (atomic_cmpset_int(&inp->sctp_flags, flags, (flags | SCTP_PCB_FLAGS_SOCKET_GONE | SCTP_PCB_FLAGS_CLOSE_IP)))) {
546 #ifdef SCTP_LOG_CLOSING
547 sctp_log_closing(inp, NULL, 16);
548 #endif
549 sctp_inpcb_free(inp, SCTP_FREE_SHOULD_USE_ABORT,
550 SCTP_CALLED_AFTER_CMPSET_OFCLOSE);
551 SOCK_LOCK(so);
552 SCTP_SB_CLEAR(so->so_snd);
553 /*
554 * same for the rcv ones, they are only here for the
555 * accounting/select.
556 */
557 SCTP_SB_CLEAR(so->so_rcv);
558 /* Now null out the reference, we are completely detached. */
559 so->so_pcb = NULL;
560 SOCK_UNLOCK(so);
561 } else {
562 flags = inp->sctp_flags;
563 if ((flags & SCTP_PCB_FLAGS_SOCKET_GONE) == 0) {
564 goto sctp_must_try_again;
565 }
566 }
567 return;
568 }
569
570 static int
571 sctp6_attach(struct socket *so, int proto SCTP_UNUSED, struct thread *p SCTP_UNUSED)
572 {
573 struct in6pcb *inp6;
574 int error;
575 struct sctp_inpcb *inp;
576 uint32_t vrf_id = SCTP_DEFAULT_VRFID;
577
578 inp = (struct sctp_inpcb *)so->so_pcb;
579 if (inp != NULL) {
580 SCTP_LTRACE_ERR_RET(inp, NULL, NULL, SCTP_FROM_SCTP6_USRREQ, EINVAL);
581 return (EINVAL);
582 }
583 if (so->so_snd.sb_hiwat == 0 || so->so_rcv.sb_hiwat == 0) {
584 error = SCTP_SORESERVE(so, SCTP_BASE_SYSCTL(sctp_sendspace), SCTP_BASE_SYSCTL(sctp_recvspace));
585 if (error)
586 return (error);
587 }
588 error = sctp_inpcb_alloc(so, vrf_id);
589 if (error)
590 return (error);
591 inp = (struct sctp_inpcb *)so->so_pcb;
592 SCTP_INP_WLOCK(inp);
593 inp->sctp_flags |= SCTP_PCB_FLAGS_BOUND_V6; /* I'm v6! */
594 inp6 = (struct in6pcb *)inp;
595
596 inp6->inp_vflag |= INP_IPV6;
597 inp6->in6p_hops = -1; /* use kernel default */
598 inp6->in6p_cksum = -1; /* just to be sure */
599 #ifdef INET
600 /*
601 * XXX: ugly!! IPv4 TTL initialization is necessary for an IPv6
602 * socket as well, because the socket may be bound to an IPv6
603 * wildcard address, which may match an IPv4-mapped IPv6 address.
604 */
605 inp6->inp_ip_ttl = MODULE_GLOBAL(ip_defttl);
606 #endif
607 /*
608 * Hmm what about the IPSEC stuff that is missing here but in
609 * sctp_attach()?
610 */
611 SCTP_INP_WUNLOCK(inp);
612 return (0);
613 }
614
615 static int
616 sctp6_bind(struct socket *so, struct sockaddr *addr, struct thread *p)
617 {
618 struct sctp_inpcb *inp;
619 struct in6pcb *inp6;
620 int error;
621
622 inp = (struct sctp_inpcb *)so->so_pcb;
623 if (inp == NULL) {
624 SCTP_LTRACE_ERR_RET(inp, NULL, NULL, SCTP_FROM_SCTP6_USRREQ, EINVAL);
625 return (EINVAL);
626 }
627 if (addr) {
628 switch (addr->sa_family) {
629 #ifdef INET
630 case AF_INET:
631 if (addr->sa_len != sizeof(struct sockaddr_in)) {
632 SCTP_LTRACE_ERR_RET(inp, NULL, NULL, SCTP_FROM_SCTP6_USRREQ, EINVAL);
633 return (EINVAL);
634 }
635 break;
636 #endif
637 #ifdef INET6
638 case AF_INET6:
639 if (addr->sa_len != sizeof(struct sockaddr_in6)) {
640 SCTP_LTRACE_ERR_RET(inp, NULL, NULL, SCTP_FROM_SCTP6_USRREQ, EINVAL);
641 return (EINVAL);
642 }
643 break;
644 #endif
645 default:
646 SCTP_LTRACE_ERR_RET(inp, NULL, NULL, SCTP_FROM_SCTP6_USRREQ, EINVAL);
647 return (EINVAL);
648 }
649 }
650 inp6 = (struct in6pcb *)inp;
651 inp6->inp_vflag &= ~INP_IPV4;
652 inp6->inp_vflag |= INP_IPV6;
653 if ((addr != NULL) && (SCTP_IPV6_V6ONLY(inp6) == 0)) {
654 switch (addr->sa_family) {
655 #ifdef INET
656 case AF_INET:
657 /* binding v4 addr to v6 socket, so reset flags */
658 inp6->inp_vflag |= INP_IPV4;
659 inp6->inp_vflag &= ~INP_IPV6;
660 break;
661 #endif
662 #ifdef INET6
663 case AF_INET6:
664 {
665 struct sockaddr_in6 *sin6_p;
666
667 sin6_p = (struct sockaddr_in6 *)addr;
668
669 if (IN6_IS_ADDR_UNSPECIFIED(&sin6_p->sin6_addr)) {
670 inp6->inp_vflag |= INP_IPV4;
671 }
672 #ifdef INET
673 if (IN6_IS_ADDR_V4MAPPED(&sin6_p->sin6_addr)) {
674 struct sockaddr_in sin;
675
676 in6_sin6_2_sin(&sin, sin6_p);
677 inp6->inp_vflag |= INP_IPV4;
678 inp6->inp_vflag &= ~INP_IPV6;
679 error = sctp_inpcb_bind(so, (struct sockaddr *)&sin, NULL, p);
680 return (error);
681 }
682 #endif
683 break;
684 }
685 #endif
686 default:
687 break;
688 }
689 } else if (addr != NULL) {
690 struct sockaddr_in6 *sin6_p;
691
692 /* IPV6_V6ONLY socket */
693 #ifdef INET
694 if (addr->sa_family == AF_INET) {
695 /* can't bind v4 addr to v6 only socket! */
696 SCTP_LTRACE_ERR_RET(inp, NULL, NULL, SCTP_FROM_SCTP6_USRREQ, EINVAL);
697 return (EINVAL);
698 }
699 #endif
700 sin6_p = (struct sockaddr_in6 *)addr;
701
702 if (IN6_IS_ADDR_V4MAPPED(&sin6_p->sin6_addr)) {
703 /* can't bind v4-mapped addrs either! */
704 /* NOTE: we don't support SIIT */
705 SCTP_LTRACE_ERR_RET(inp, NULL, NULL, SCTP_FROM_SCTP6_USRREQ, EINVAL);
706 return (EINVAL);
707 }
708 }
709 error = sctp_inpcb_bind(so, addr, NULL, p);
710 return (error);
711 }
712
713
714 static void
715 sctp6_close(struct socket *so)
716 {
717 sctp_close(so);
718 }
719
720 /* This could be made common with sctp_detach() since they are identical */
721
722 static
723 int
724 sctp6_disconnect(struct socket *so)
725 {
726 return (sctp_disconnect(so));
727 }
728
729
730 int
731 sctp_sendm(struct socket *so, int flags, struct mbuf *m, struct sockaddr *addr,
732 struct mbuf *control, struct thread *p);
733
734
735 static int
736 sctp6_send(struct socket *so, int flags, struct mbuf *m, struct sockaddr *addr,
737 struct mbuf *control, struct thread *p)
738 {
739 struct sctp_inpcb *inp;
740 struct in6pcb *inp6;
741
742 #ifdef INET
743 struct sockaddr_in6 *sin6;
744
745 #endif /* INET */
746 /* No SPL needed since sctp_output does this */
747
748 inp = (struct sctp_inpcb *)so->so_pcb;
749 if (inp == NULL) {
750 if (control) {
751 SCTP_RELEASE_PKT(control);
752 control = NULL;
753 }
754 SCTP_RELEASE_PKT(m);
755 SCTP_LTRACE_ERR_RET(inp, NULL, NULL, SCTP_FROM_SCTP6_USRREQ, EINVAL);
756 return (EINVAL);
757 }
758 inp6 = (struct in6pcb *)inp;
759 /*
760 * For the TCP model we may get a NULL addr, if we are a connected
761 * socket thats ok.
762 */
763 if ((inp->sctp_flags & SCTP_PCB_FLAGS_CONNECTED) &&
764 (addr == NULL)) {
765 goto connected_type;
766 }
767 if (addr == NULL) {
768 SCTP_RELEASE_PKT(m);
769 if (control) {
770 SCTP_RELEASE_PKT(control);
771 control = NULL;
772 }
773 SCTP_LTRACE_ERR_RET(inp, NULL, NULL, SCTP_FROM_SCTP6_USRREQ, EDESTADDRREQ);
774 return (EDESTADDRREQ);
775 }
776 #ifdef INET
777 sin6 = (struct sockaddr_in6 *)addr;
778 if (SCTP_IPV6_V6ONLY(inp6)) {
779 /*
780 * if IPV6_V6ONLY flag, we discard datagrams destined to a
781 * v4 addr or v4-mapped addr
782 */
783 if (addr->sa_family == AF_INET) {
784 SCTP_LTRACE_ERR_RET(inp, NULL, NULL, SCTP_FROM_SCTP6_USRREQ, EINVAL);
785 return (EINVAL);
786 }
787 if (IN6_IS_ADDR_V4MAPPED(&sin6->sin6_addr)) {
788 SCTP_LTRACE_ERR_RET(inp, NULL, NULL, SCTP_FROM_SCTP6_USRREQ, EINVAL);
789 return (EINVAL);
790 }
791 }
792 if (IN6_IS_ADDR_V4MAPPED(&sin6->sin6_addr)) {
793 struct sockaddr_in sin;
794
795 /* convert v4-mapped into v4 addr and send */
796 in6_sin6_2_sin(&sin, sin6);
797 return (sctp_sendm(so, flags, m, (struct sockaddr *)&sin, control, p));
798 }
799 #endif /* INET */
800 connected_type:
801 /* now what about control */
802 if (control) {
803 if (inp->control) {
804 SCTP_PRINTF("huh? control set?\n");
805 SCTP_RELEASE_PKT(inp->control);
806 inp->control = NULL;
807 }
808 inp->control = control;
809 }
810 /* Place the data */
811 if (inp->pkt) {
812 SCTP_BUF_NEXT(inp->pkt_last) = m;
813 inp->pkt_last = m;
814 } else {
815 inp->pkt_last = inp->pkt = m;
816 }
817 if (
818 /* FreeBSD and MacOSX uses a flag passed */
819 ((flags & PRUS_MORETOCOME) == 0)
820 ) {
821 /*
822 * note with the current version this code will only be used
823 * by OpenBSD, NetBSD and FreeBSD have methods for
824 * re-defining sosend() to use sctp_sosend(). One can
825 * optionaly switch back to this code (by changing back the
826 * defininitions but this is not advisable.
827 */
828 int ret;
829
830 ret = sctp_output(inp, inp->pkt, addr, inp->control, p, flags);
831 inp->pkt = NULL;
832 inp->control = NULL;
833 return (ret);
834 } else {
835 return (0);
836 }
837 }
838
839 static int
840 sctp6_connect(struct socket *so, struct sockaddr *addr, struct thread *p)
841 {
842 uint32_t vrf_id;
843 int error = 0;
844 struct sctp_inpcb *inp;
845 struct sctp_tcb *stcb;
846
847 #ifdef INET
848 struct in6pcb *inp6;
849 struct sockaddr_in6 *sin6;
850 union sctp_sockstore store;
851
852 #endif
853
854 #ifdef INET
855 inp6 = (struct in6pcb *)so->so_pcb;
856 #endif
857 inp = (struct sctp_inpcb *)so->so_pcb;
858 if (inp == NULL) {
859 SCTP_LTRACE_ERR_RET(inp, NULL, NULL, SCTP_FROM_SCTP6_USRREQ, ECONNRESET);
860 return (ECONNRESET); /* I made the same as TCP since we are
861 * not setup? */
862 }
863 if (addr == NULL) {
864 SCTP_LTRACE_ERR_RET(inp, NULL, NULL, SCTP_FROM_SCTP6_USRREQ, EINVAL);
865 return (EINVAL);
866 }
867 switch (addr->sa_family) {
868 #ifdef INET
869 case AF_INET:
870 if (addr->sa_len != sizeof(struct sockaddr_in)) {
871 SCTP_LTRACE_ERR_RET(inp, NULL, NULL, SCTP_FROM_SCTP6_USRREQ, EINVAL);
872 return (EINVAL);
873 }
874 break;
875 #endif
876 #ifdef INET6
877 case AF_INET6:
878 if (addr->sa_len != sizeof(struct sockaddr_in6)) {
879 SCTP_LTRACE_ERR_RET(inp, NULL, NULL, SCTP_FROM_SCTP6_USRREQ, EINVAL);
880 return (EINVAL);
881 }
882 break;
883 #endif
884 default:
885 SCTP_LTRACE_ERR_RET(inp, NULL, NULL, SCTP_FROM_SCTP6_USRREQ, EINVAL);
886 return (EINVAL);
887 }
888
889 vrf_id = inp->def_vrf_id;
890 SCTP_ASOC_CREATE_LOCK(inp);
891 SCTP_INP_RLOCK(inp);
892 if ((inp->sctp_flags & SCTP_PCB_FLAGS_UNBOUND) ==
893 SCTP_PCB_FLAGS_UNBOUND) {
894 /* Bind a ephemeral port */
895 SCTP_INP_RUNLOCK(inp);
896 error = sctp6_bind(so, NULL, p);
897 if (error) {
898 SCTP_ASOC_CREATE_UNLOCK(inp);
899
900 return (error);
901 }
902 SCTP_INP_RLOCK(inp);
903 }
904 if ((inp->sctp_flags & SCTP_PCB_FLAGS_TCPTYPE) &&
905 (inp->sctp_flags & SCTP_PCB_FLAGS_CONNECTED)) {
906 /* We are already connected AND the TCP model */
907 SCTP_INP_RUNLOCK(inp);
908 SCTP_ASOC_CREATE_UNLOCK(inp);
909 SCTP_LTRACE_ERR_RET(inp, NULL, NULL, SCTP_FROM_SCTP6_USRREQ, EADDRINUSE);
910 return (EADDRINUSE);
911 }
912 #ifdef INET
913 sin6 = (struct sockaddr_in6 *)addr;
914 if (SCTP_IPV6_V6ONLY(inp6)) {
915 /*
916 * if IPV6_V6ONLY flag, ignore connections destined to a v4
917 * addr or v4-mapped addr
918 */
919 if (addr->sa_family == AF_INET) {
920 SCTP_INP_RUNLOCK(inp);
921 SCTP_ASOC_CREATE_UNLOCK(inp);
922 SCTP_LTRACE_ERR_RET(inp, NULL, NULL, SCTP_FROM_SCTP6_USRREQ, EINVAL);
923 return (EINVAL);
924 }
925 if (IN6_IS_ADDR_V4MAPPED(&sin6->sin6_addr)) {
926 SCTP_INP_RUNLOCK(inp);
927 SCTP_ASOC_CREATE_UNLOCK(inp);
928 SCTP_LTRACE_ERR_RET(inp, NULL, NULL, SCTP_FROM_SCTP6_USRREQ, EINVAL);
929 return (EINVAL);
930 }
931 }
932 if (IN6_IS_ADDR_V4MAPPED(&sin6->sin6_addr)) {
933 /* convert v4-mapped into v4 addr */
934 in6_sin6_2_sin(&store.sin, sin6);
935 addr = &store.sa;
936 }
937 #endif /* INET */
938 /* Now do we connect? */
939 if (inp->sctp_flags & SCTP_PCB_FLAGS_CONNECTED) {
940 stcb = LIST_FIRST(&inp->sctp_asoc_list);
941 if (stcb) {
942 SCTP_TCB_UNLOCK(stcb);
943 }
944 SCTP_INP_RUNLOCK(inp);
945 } else {
946 SCTP_INP_RUNLOCK(inp);
947 SCTP_INP_WLOCK(inp);
948 SCTP_INP_INCR_REF(inp);
949 SCTP_INP_WUNLOCK(inp);
950 stcb = sctp_findassociation_ep_addr(&inp, addr, NULL, NULL, NULL);
951 if (stcb == NULL) {
952 SCTP_INP_WLOCK(inp);
953 SCTP_INP_DECR_REF(inp);
954 SCTP_INP_WUNLOCK(inp);
955 }
956 }
957
958 if (stcb != NULL) {
959 /* Already have or am bring up an association */
960 SCTP_ASOC_CREATE_UNLOCK(inp);
961 SCTP_TCB_UNLOCK(stcb);
962 SCTP_LTRACE_ERR_RET(inp, NULL, NULL, SCTP_FROM_SCTP6_USRREQ, EALREADY);
963 return (EALREADY);
964 }
965 /* We are GOOD to go */
966 stcb = sctp_aloc_assoc(inp, addr, &error, 0, vrf_id, p);
967 SCTP_ASOC_CREATE_UNLOCK(inp);
968 if (stcb == NULL) {
969 /* Gak! no memory */
970 return (error);
971 }
972 if (stcb->sctp_ep->sctp_flags & SCTP_PCB_FLAGS_TCPTYPE) {
973 stcb->sctp_ep->sctp_flags |= SCTP_PCB_FLAGS_CONNECTED;
974 /* Set the connected flag so we can queue data */
975 soisconnecting(so);
976 }
977 stcb->asoc.state = SCTP_STATE_COOKIE_WAIT;
978 (void)SCTP_GETTIME_TIMEVAL(&stcb->asoc.time_entered);
979
980 /* initialize authentication parameters for the assoc */
981 sctp_initialize_auth_params(inp, stcb);
982
983 sctp_send_initiate(inp, stcb, SCTP_SO_LOCKED);
984 SCTP_TCB_UNLOCK(stcb);
985 return (error);
986 }
987
988 static int
989 sctp6_getaddr(struct socket *so, struct sockaddr **addr)
990 {
991 struct sockaddr_in6 *sin6;
992 struct sctp_inpcb *inp;
993 uint32_t vrf_id;
994 struct sctp_ifa *sctp_ifa;
995
996 int error;
997
998 /*
999 * Do the malloc first in case it blocks.
1000 */
1001 SCTP_MALLOC_SONAME(sin6, struct sockaddr_in6 *, sizeof(*sin6));
1002 if (sin6 == NULL)
1003 return (ENOMEM);
1004 sin6->sin6_family = AF_INET6;
1005 sin6->sin6_len = sizeof(*sin6);
1006
1007 inp = (struct sctp_inpcb *)so->so_pcb;
1008 if (inp == NULL) {
1009 SCTP_FREE_SONAME(sin6);
1010 SCTP_LTRACE_ERR_RET(inp, NULL, NULL, SCTP_FROM_SCTP6_USRREQ, ECONNRESET);
1011 return (ECONNRESET);
1012 }
1013 SCTP_INP_RLOCK(inp);
1014 sin6->sin6_port = inp->sctp_lport;
1015 if (inp->sctp_flags & SCTP_PCB_FLAGS_BOUNDALL) {
1016 /* For the bound all case you get back 0 */
1017 if (inp->sctp_flags & SCTP_PCB_FLAGS_CONNECTED) {
1018 struct sctp_tcb *stcb;
1019 struct sockaddr_in6 *sin_a6;
1020 struct sctp_nets *net;
1021 int fnd;
1022
1023 stcb = LIST_FIRST(&inp->sctp_asoc_list);
1024 if (stcb == NULL) {
1025 goto notConn6;
1026 }
1027 fnd = 0;
1028 sin_a6 = NULL;
1029 TAILQ_FOREACH(net, &stcb->asoc.nets, sctp_next) {
1030 sin_a6 = (struct sockaddr_in6 *)&net->ro._l_addr;
1031 if (sin_a6 == NULL)
1032 /* this will make coverity happy */
1033 continue;
1034
1035 if (sin_a6->sin6_family == AF_INET6) {
1036 fnd = 1;
1037 break;
1038 }
1039 }
1040 if ((!fnd) || (sin_a6 == NULL)) {
1041 /* punt */
1042 goto notConn6;
1043 }
1044 vrf_id = inp->def_vrf_id;
1045 sctp_ifa = sctp_source_address_selection(inp, stcb, (sctp_route_t *) & net->ro, net, 0, vrf_id);
1046 if (sctp_ifa) {
1047 sin6->sin6_addr = sctp_ifa->address.sin6.sin6_addr;
1048 }
1049 } else {
1050 /* For the bound all case you get back 0 */
1051 notConn6:
1052 memset(&sin6->sin6_addr, 0, sizeof(sin6->sin6_addr));
1053 }
1054 } else {
1055 /* Take the first IPv6 address in the list */
1056 struct sctp_laddr *laddr;
1057 int fnd = 0;
1058
1059 LIST_FOREACH(laddr, &inp->sctp_addr_list, sctp_nxt_addr) {
1060 if (laddr->ifa->address.sa.sa_family == AF_INET6) {
1061 struct sockaddr_in6 *sin_a;
1062
1063 sin_a = &laddr->ifa->address.sin6;
1064 sin6->sin6_addr = sin_a->sin6_addr;
1065 fnd = 1;
1066 break;
1067 }
1068 }
1069 if (!fnd) {
1070 SCTP_FREE_SONAME(sin6);
1071 SCTP_INP_RUNLOCK(inp);
1072 SCTP_LTRACE_ERR_RET(inp, NULL, NULL, SCTP_FROM_SCTP6_USRREQ, ENOENT);
1073 return (ENOENT);
1074 }
1075 }
1076 SCTP_INP_RUNLOCK(inp);
1077 /* Scoping things for v6 */
1078 if ((error = sa6_recoverscope(sin6)) != 0) {
1079 SCTP_FREE_SONAME(sin6);
1080 return (error);
1081 }
1082 (*addr) = (struct sockaddr *)sin6;
1083 return (0);
1084 }
1085
1086 static int
1087 sctp6_peeraddr(struct socket *so, struct sockaddr **addr)
1088 {
1089 struct sockaddr_in6 *sin6;
1090 int fnd;
1091 struct sockaddr_in6 *sin_a6;
1092 struct sctp_inpcb *inp;
1093 struct sctp_tcb *stcb;
1094 struct sctp_nets *net;
1095 int error;
1096
1097 /* Do the malloc first in case it blocks. */
1098 SCTP_MALLOC_SONAME(sin6, struct sockaddr_in6 *, sizeof *sin6);
1099 if (sin6 == NULL)
1100 return (ENOMEM);
1101 sin6->sin6_family = AF_INET6;
1102 sin6->sin6_len = sizeof(*sin6);
1103
1104 inp = (struct sctp_inpcb *)so->so_pcb;
1105 if ((inp == NULL) ||
1106 ((inp->sctp_flags & SCTP_PCB_FLAGS_CONNECTED) == 0)) {
1107 /* UDP type and listeners will drop out here */
1108 SCTP_FREE_SONAME(sin6);
1109 SCTP_LTRACE_ERR_RET(inp, NULL, NULL, SCTP_FROM_SCTP6_USRREQ, ENOTCONN);
1110 return (ENOTCONN);
1111 }
1112 SCTP_INP_RLOCK(inp);
1113 stcb = LIST_FIRST(&inp->sctp_asoc_list);
1114 if (stcb) {
1115 SCTP_TCB_LOCK(stcb);
1116 }
1117 SCTP_INP_RUNLOCK(inp);
1118 if (stcb == NULL) {
1119 SCTP_FREE_SONAME(sin6);
1120 SCTP_LTRACE_ERR_RET(inp, NULL, NULL, SCTP_FROM_SCTP6_USRREQ, ECONNRESET);
1121 return (ECONNRESET);
1122 }
1123 fnd = 0;
1124 TAILQ_FOREACH(net, &stcb->asoc.nets, sctp_next) {
1125 sin_a6 = (struct sockaddr_in6 *)&net->ro._l_addr;
1126 if (sin_a6->sin6_family == AF_INET6) {
1127 fnd = 1;
1128 sin6->sin6_port = stcb->rport;
1129 sin6->sin6_addr = sin_a6->sin6_addr;
1130 break;
1131 }
1132 }
1133 SCTP_TCB_UNLOCK(stcb);
1134 if (!fnd) {
1135 /* No IPv4 address */
1136 SCTP_FREE_SONAME(sin6);
1137 SCTP_LTRACE_ERR_RET(inp, NULL, NULL, SCTP_FROM_SCTP6_USRREQ, ENOENT);
1138 return (ENOENT);
1139 }
1140 if ((error = sa6_recoverscope(sin6)) != 0)
1141 return (error);
1142 *addr = (struct sockaddr *)sin6;
1143 return (0);
1144 }
1145
1146 static int
1147 sctp6_in6getaddr(struct socket *so, struct sockaddr **nam)
1148 {
1149 #ifdef INET
1150 struct sockaddr *addr;
1151
1152 #endif
1153 struct in6pcb *inp6 = sotoin6pcb(so);
1154 int error;
1155
1156 if (inp6 == NULL) {
1157 SCTP_LTRACE_ERR_RET(NULL, NULL, NULL, SCTP_FROM_SCTP6_USRREQ, EINVAL);
1158 return (EINVAL);
1159 }
1160 /* allow v6 addresses precedence */
1161 error = sctp6_getaddr(so, nam);
1162 #ifdef INET
1163 if (error) {
1164 /* try v4 next if v6 failed */
1165 error = sctp_ingetaddr(so, nam);
1166 if (error) {
1167 return (error);
1168 }
1169 addr = *nam;
1170 /* if I'm V6ONLY, convert it to v4-mapped */
1171 if (SCTP_IPV6_V6ONLY(inp6)) {
1172 struct sockaddr_in6 sin6;
1173
1174 in6_sin_2_v4mapsin6((struct sockaddr_in *)addr, &sin6);
1175 memcpy(addr, &sin6, sizeof(struct sockaddr_in6));
1176 }
1177 }
1178 #endif
1179 return (error);
1180 }
1181
1182
1183 static int
1184 sctp6_getpeeraddr(struct socket *so, struct sockaddr **nam)
1185 {
1186 #ifdef INET
1187 struct sockaddr *addr;
1188
1189 #endif
1190 struct in6pcb *inp6 = sotoin6pcb(so);
1191 int error;
1192
1193 if (inp6 == NULL) {
1194 SCTP_LTRACE_ERR_RET(NULL, NULL, NULL, SCTP_FROM_SCTP6_USRREQ, EINVAL);
1195 return (EINVAL);
1196 }
1197 /* allow v6 addresses precedence */
1198 error = sctp6_peeraddr(so, nam);
1199 #ifdef INET
1200 if (error) {
1201 /* try v4 next if v6 failed */
1202 error = sctp_peeraddr(so, nam);
1203 if (error) {
1204 return (error);
1205 }
1206 addr = *nam;
1207 /* if I'm V6ONLY, convert it to v4-mapped */
1208 if (SCTP_IPV6_V6ONLY(inp6)) {
1209 struct sockaddr_in6 sin6;
1210
1211 in6_sin_2_v4mapsin6((struct sockaddr_in *)addr, &sin6);
1212 memcpy(addr, &sin6, sizeof(struct sockaddr_in6));
1213 }
1214 }
1215 #endif
1216 return (error);
1217 }
1218
1219 struct pr_usrreqs sctp6_usrreqs = {
1220 .pru_abort = sctp6_abort,
1221 .pru_accept = sctp_accept,
1222 .pru_attach = sctp6_attach,
1223 .pru_bind = sctp6_bind,
1224 .pru_connect = sctp6_connect,
1225 .pru_control = in6_control,
1226 .pru_close = sctp6_close,
1227 .pru_detach = sctp6_close,
1228 .pru_sopoll = sopoll_generic,
1229 .pru_flush = sctp_flush,
1230 .pru_disconnect = sctp6_disconnect,
1231 .pru_listen = sctp_listen,
1232 .pru_peeraddr = sctp6_getpeeraddr,
1233 .pru_send = sctp6_send,
1234 .pru_shutdown = sctp_shutdown,
1235 .pru_sockaddr = sctp6_in6getaddr,
1236 .pru_sosend = sctp_sosend,
1237 .pru_soreceive = sctp_soreceive
1238 };
1239
1240 #endif
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