1 /*- 2 * Copyright (c) 2001-2007, Cisco Systems, Inc. All rights reserved. 3 * 4 * Redistribution and use in source and binary forms, with or without 5 * modification, are permitted provided that the following conditions are met: 6 * 7 * a) Redistributions of source code must retain the above copyright notice, 8 * this list of conditions and the following disclaimer. 9 * 10 * b) Redistributions in binary form must reproduce the above copyright 11 * notice, this list of conditions and the following disclaimer in 12 * the documentation and/or other materials provided with the distribution. 13 * 14 * c) Neither the name of Cisco Systems, Inc. nor the names of its 15 * contributors may be used to endorse or promote products derived 16 * from this software without specific prior written permission. 17 * 18 * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS 19 * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, 20 * THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 21 * ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR CONTRIBUTORS BE 22 * LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR 23 * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF 24 * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS 25 * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN 26 * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) 27 * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF 28 * THE POSSIBILITY OF SUCH DAMAGE. 29 */ 30 /* $KAME: sctp6_usrreq.c,v 1.38 2005/08/24 08:08:56 suz Exp $ */ 31 #include <sys/cdefs.h> 32 __FBSDID("$FreeBSD$"); 33 34 #include <netinet/sctp_os.h> 35 #include <sys/proc.h> 36 #include <netinet/sctp_pcb.h> 37 #include <netinet/sctp_header.h> 38 #include <netinet/sctp_var.h> 39 #include <netinet/sctp_output.h> 40 #include <netinet/sctp_input.h> 41 #include <netinet/sctp_bsd_addr.h> 42 #include <netinet/sctp_uio.h> 43 #include <netinet/sctp_asconf.h> 44 #include <netinet/sctputil.h> 45 #include <netinet/sctp_indata.h> 46 #include <netinet/sctp_asconf.h> 47 #include <netinet/sctp_timer.h> 48 #include <netinet/sctp_auth.h> 49 #include <netinet6/sctp6_var.h> 50 51 52 53 #ifdef SCTP_DEBUG 54 extern uint32_t sctp_debug_on; 55 56 #endif /* SCTP_DEBUG */ 57 58 extern struct protosw inetsw[]; 59 60 61 62 extern int sctp_no_csum_on_loopback; 63 64 int 65 sctp6_input(mp, offp, proto) 66 struct mbuf **mp; 67 int *offp; 68 69 int proto; 70 71 { 72 struct mbuf *m; 73 struct ip6_hdr *ip6; 74 struct sctphdr *sh; 75 struct sctp_inpcb *in6p = NULL; 76 struct sctp_nets *net; 77 int refcount_up = 0; 78 u_int32_t check, calc_check; 79 struct inpcb *in6p_ip; 80 struct sctp_chunkhdr *ch; 81 int length, mlen, offset, iphlen; 82 u_int8_t ecn_bits; 83 struct sctp_tcb *stcb = NULL; 84 int off = *offp; 85 86 m = SCTP_HEADER_TO_CHAIN(*mp); 87 88 ip6 = mtod(m, struct ip6_hdr *); 89 #ifndef PULLDOWN_TEST 90 /* If PULLDOWN_TEST off, must be in a single mbuf. */ 91 IP6_EXTHDR_CHECK(m, off, (int)(sizeof(*sh) + sizeof(*ch)), IPPROTO_DONE); 92 sh = (struct sctphdr *)((caddr_t)ip6 + off); 93 ch = (struct sctp_chunkhdr *)((caddr_t)sh + sizeof(*sh)); 94 #else 95 /* Ensure that (sctphdr + sctp_chunkhdr) in a row. */ 96 IP6_EXTHDR_GET(sh, struct sctphdr *, m, off, sizeof(*sh) + sizeof(*ch)); 97 if (sh == NULL) { 98 SCTP_STAT_INCR(sctps_hdrops); 99 return IPPROTO_DONE; 100 } 101 ch = (struct sctp_chunkhdr *)((caddr_t)sh + sizeof(struct sctphdr)); 102 #endif 103 104 iphlen = off; 105 offset = iphlen + sizeof(*sh) + sizeof(*ch); 106 107 #if defined(NFAITH) && NFAITH > 0 108 109 if (faithprefix_p != NULL && (*faithprefix_p) (&ip6->ip6_dst)) { 110 /* XXX send icmp6 host/port unreach? */ 111 goto bad; 112 } 113 #endif /* NFAITH defined and > 0 */ 114 SCTP_STAT_INCR(sctps_recvpackets); 115 SCTP_STAT_INCR_COUNTER64(sctps_inpackets); 116 #ifdef SCTP_DEBUG 117 if (sctp_debug_on & SCTP_DEBUG_INPUT1) { 118 printf("V6 input gets a packet iphlen:%d pktlen:%d\n", iphlen, SCTP_HEADER_LEN((*mp))); 119 } 120 #endif 121 if (IN6_IS_ADDR_MULTICAST(&ip6->ip6_dst)) { 122 /* No multi-cast support in SCTP */ 123 goto bad; 124 } 125 /* destination port of 0 is illegal, based on RFC2960. */ 126 if (sh->dest_port == 0) 127 goto bad; 128 if ((sctp_no_csum_on_loopback == 0) || 129 (!SCTP_IS_IT_LOOPBACK(m))) { 130 /* 131 * we do NOT validate things from the loopback if the sysctl 132 * is set to 1. 133 */ 134 check = sh->checksum; /* save incoming checksum */ 135 if ((check == 0) && (sctp_no_csum_on_loopback)) { 136 /* 137 * special hook for where we got a local address 138 * somehow routed across a non IFT_LOOP type 139 * interface 140 */ 141 if (IN6_ARE_ADDR_EQUAL(&ip6->ip6_src, &ip6->ip6_dst)) 142 goto sctp_skip_csum; 143 } 144 sh->checksum = 0; /* prepare for calc */ 145 calc_check = sctp_calculate_sum(m, &mlen, iphlen); 146 if (calc_check != check) { 147 #ifdef SCTP_DEBUG 148 if (sctp_debug_on & SCTP_DEBUG_INPUT1) { 149 printf("Bad CSUM on SCTP packet calc_check:%x check:%x m:%p mlen:%d iphlen:%d\n", 150 calc_check, check, m, 151 mlen, iphlen); 152 } 153 #endif 154 stcb = sctp_findassociation_addr(m, iphlen, offset - sizeof(*ch), 155 sh, ch, &in6p, &net); 156 /* in6p's ref-count increased && stcb locked */ 157 if ((in6p) && (stcb)) { 158 sctp_send_packet_dropped(stcb, net, m, iphlen, 1); 159 sctp_chunk_output((struct sctp_inpcb *)in6p, stcb, 2); 160 } else if ((in6p != NULL) && (stcb == NULL)) { 161 refcount_up = 1; 162 } 163 SCTP_STAT_INCR(sctps_badsum); 164 SCTP_STAT_INCR_COUNTER32(sctps_checksumerrors); 165 goto bad; 166 } 167 sh->checksum = calc_check; 168 } 169 sctp_skip_csum: 170 net = NULL; 171 /* 172 * Locate pcb and tcb for datagram sctp_findassociation_addr() wants 173 * IP/SCTP/first chunk header... 174 */ 175 stcb = sctp_findassociation_addr(m, iphlen, offset - sizeof(*ch), 176 sh, ch, &in6p, &net); 177 /* in6p's ref-count increased */ 178 if (in6p == NULL) { 179 struct sctp_init_chunk *init_chk, chunk_buf; 180 181 SCTP_STAT_INCR(sctps_noport); 182 if (ch->chunk_type == SCTP_INITIATION) { 183 /* 184 * we do a trick here to get the INIT tag, dig in 185 * and get the tag from the INIT and put it in the 186 * common header. 187 */ 188 init_chk = (struct sctp_init_chunk *)sctp_m_getptr(m, 189 iphlen + sizeof(*sh), sizeof(*init_chk), 190 (u_int8_t *) & chunk_buf); 191 sh->v_tag = init_chk->init.initiate_tag; 192 } 193 if (ch->chunk_type == SCTP_SHUTDOWN_ACK) { 194 sctp_send_shutdown_complete2(m, iphlen, sh); 195 goto bad; 196 } 197 if (ch->chunk_type == SCTP_SHUTDOWN_COMPLETE) { 198 goto bad; 199 } 200 if (ch->chunk_type != SCTP_ABORT_ASSOCIATION) 201 sctp_send_abort(m, iphlen, sh, 0, NULL); 202 goto bad; 203 } else if (stcb == NULL) { 204 refcount_up = 1; 205 } 206 in6p_ip = (struct inpcb *)in6p; 207 #ifdef IPSEC 208 /* 209 * Check AH/ESP integrity. 210 */ 211 if (in6p_ip && (ipsec6_in_reject(m, in6p_ip))) { 212 /* XXX */ 213 ipsec6stat.in_polvio++; 214 goto bad; 215 } 216 #endif /* IPSEC */ 217 218 219 /* 220 * CONTROL chunk processing 221 */ 222 offset -= sizeof(*ch); 223 ecn_bits = ((ntohl(ip6->ip6_flow) >> 20) & 0x000000ff); 224 225 /* Length now holds the total packet length payload + iphlen */ 226 length = ntohs(ip6->ip6_plen) + iphlen; 227 228 (void)sctp_common_input_processing(&m, iphlen, offset, length, sh, ch, 229 in6p, stcb, net, ecn_bits); 230 /* inp's ref-count reduced && stcb unlocked */ 231 /* XXX this stuff below gets moved to appropriate parts later... */ 232 if (m) 233 m_freem(m); 234 if ((in6p) && refcount_up) { 235 /* reduce ref-count */ 236 SCTP_INP_WLOCK(in6p); 237 SCTP_INP_DECR_REF(in6p); 238 SCTP_INP_WUNLOCK(in6p); 239 } 240 return IPPROTO_DONE; 241 242 bad: 243 if (stcb) 244 SCTP_TCB_UNLOCK(stcb); 245 246 if ((in6p) && refcount_up) { 247 /* reduce ref-count */ 248 SCTP_INP_WLOCK(in6p); 249 SCTP_INP_DECR_REF(in6p); 250 SCTP_INP_WUNLOCK(in6p); 251 } 252 if (m) 253 m_freem(m); 254 return IPPROTO_DONE; 255 } 256 257 258 static void 259 sctp6_notify_mbuf(struct sctp_inpcb *inp, 260 struct icmp6_hdr *icmp6, 261 struct sctphdr *sh, 262 struct sctp_tcb *stcb, 263 struct sctp_nets *net) 264 { 265 u_int32_t nxtsz; 266 267 if ((inp == NULL) || (stcb == NULL) || (net == NULL) || 268 (icmp6 == NULL) || (sh == NULL)) { 269 goto out; 270 } 271 /* First do we even look at it? */ 272 if (ntohl(sh->v_tag) != (stcb->asoc.peer_vtag)) 273 goto out; 274 275 if (icmp6->icmp6_type != ICMP6_PACKET_TOO_BIG) { 276 /* not PACKET TO BIG */ 277 goto out; 278 } 279 /* 280 * ok we need to look closely. We could even get smarter and look at 281 * anyone that we sent to in case we get a different ICMP that tells 282 * us there is no way to reach a host, but for this impl, all we 283 * care about is MTU discovery. 284 */ 285 nxtsz = ntohl(icmp6->icmp6_mtu); 286 /* Stop any PMTU timer */ 287 sctp_timer_stop(SCTP_TIMER_TYPE_PATHMTURAISE, inp, stcb, NULL, SCTP_FROM_SCTP6_USRREQ + SCTP_LOC_1); 288 289 /* Adjust destination size limit */ 290 if (net->mtu > nxtsz) { 291 net->mtu = nxtsz; 292 } 293 /* now what about the ep? */ 294 if (stcb->asoc.smallest_mtu > nxtsz) { 295 struct sctp_tmit_chunk *chk; 296 297 /* Adjust that too */ 298 stcb->asoc.smallest_mtu = nxtsz; 299 /* now off to subtract IP_DF flag if needed */ 300 301 TAILQ_FOREACH(chk, &stcb->asoc.send_queue, sctp_next) { 302 if ((u_int32_t) (chk->send_size + IP_HDR_SIZE) > nxtsz) { 303 chk->flags |= CHUNK_FLAGS_FRAGMENT_OK; 304 } 305 } 306 TAILQ_FOREACH(chk, &stcb->asoc.sent_queue, sctp_next) { 307 if ((u_int32_t) (chk->send_size + IP_HDR_SIZE) > nxtsz) { 308 /* 309 * For this guy we also mark for immediate 310 * resend since we sent to big of chunk 311 */ 312 chk->flags |= CHUNK_FLAGS_FRAGMENT_OK; 313 if (chk->sent != SCTP_DATAGRAM_RESEND) 314 stcb->asoc.sent_queue_retran_cnt++; 315 chk->sent = SCTP_DATAGRAM_RESEND; 316 chk->rec.data.doing_fast_retransmit = 0; 317 318 chk->sent = SCTP_DATAGRAM_RESEND; 319 /* Clear any time so NO RTT is being done */ 320 chk->sent_rcv_time.tv_sec = 0; 321 chk->sent_rcv_time.tv_usec = 0; 322 stcb->asoc.total_flight -= chk->send_size; 323 net->flight_size -= chk->send_size; 324 } 325 } 326 } 327 sctp_timer_start(SCTP_TIMER_TYPE_PATHMTURAISE, inp, stcb, NULL); 328 out: 329 if (stcb) 330 SCTP_TCB_UNLOCK(stcb); 331 } 332 333 334 void 335 sctp6_ctlinput(cmd, pktdst, d) 336 int cmd; 337 struct sockaddr *pktdst; 338 void *d; 339 { 340 struct sctphdr sh; 341 struct ip6ctlparam *ip6cp = NULL; 342 int cm; 343 344 if (pktdst->sa_family != AF_INET6 || 345 pktdst->sa_len != sizeof(struct sockaddr_in6)) 346 return; 347 348 if ((unsigned)cmd >= PRC_NCMDS) 349 return; 350 if (PRC_IS_REDIRECT(cmd)) { 351 d = NULL; 352 } else if (inet6ctlerrmap[cmd] == 0) { 353 return; 354 } 355 /* if the parameter is from icmp6, decode it. */ 356 if (d != NULL) { 357 ip6cp = (struct ip6ctlparam *)d; 358 } else { 359 ip6cp = (struct ip6ctlparam *)NULL; 360 } 361 362 if (ip6cp) { 363 /* 364 * XXX: We assume that when IPV6 is non NULL, M and OFF are 365 * valid. 366 */ 367 /* check if we can safely examine src and dst ports */ 368 struct sctp_inpcb *inp = NULL; 369 struct sctp_tcb *stcb = NULL; 370 struct sctp_nets *net = NULL; 371 struct sockaddr_in6 final; 372 373 if (ip6cp->ip6c_m == NULL) 374 return; 375 376 bzero(&sh, sizeof(sh)); 377 bzero(&final, sizeof(final)); 378 inp = NULL; 379 net = NULL; 380 m_copydata(ip6cp->ip6c_m, ip6cp->ip6c_off, sizeof(sh), 381 (caddr_t)&sh); 382 ip6cp->ip6c_src->sin6_port = sh.src_port; 383 final.sin6_len = sizeof(final); 384 final.sin6_family = AF_INET6; 385 final.sin6_addr = ((struct sockaddr_in6 *)pktdst)->sin6_addr; 386 final.sin6_port = sh.dest_port; 387 stcb = sctp_findassociation_addr_sa((struct sockaddr *)ip6cp->ip6c_src, 388 (struct sockaddr *)&final, 389 &inp, &net, 1); 390 /* inp's ref-count increased && stcb locked */ 391 if (stcb != NULL && inp && (inp->sctp_socket != NULL)) { 392 if (cmd == PRC_MSGSIZE) { 393 sctp6_notify_mbuf(inp, 394 ip6cp->ip6c_icmp6, 395 &sh, 396 stcb, 397 net); 398 /* inp's ref-count reduced && stcb unlocked */ 399 } else { 400 if (cmd == PRC_HOSTDEAD) { 401 cm = EHOSTUNREACH; 402 } else { 403 cm = inet6ctlerrmap[cmd]; 404 } 405 sctp_notify(inp, cm, &sh, 406 (struct sockaddr *)&final, 407 stcb, net); 408 /* inp's ref-count reduced && stcb unlocked */ 409 } 410 } else { 411 if (PRC_IS_REDIRECT(cmd) && inp) { 412 in6_rtchange((struct in6pcb *)inp, 413 inet6ctlerrmap[cmd]); 414 } 415 if (inp) { 416 /* reduce inp's ref-count */ 417 SCTP_INP_WLOCK(inp); 418 SCTP_INP_DECR_REF(inp); 419 SCTP_INP_WUNLOCK(inp); 420 } 421 if (stcb) 422 SCTP_TCB_UNLOCK(stcb); 423 } 424 } 425 } 426 427 /* 428 * this routine can probably be collasped into the one in sctp_userreq.c 429 * since they do the same thing and now we lookup with a sockaddr 430 */ 431 static int 432 sctp6_getcred(SYSCTL_HANDLER_ARGS) 433 { 434 struct xucred xuc; 435 struct sockaddr_in6 addrs[2]; 436 struct sctp_inpcb *inp; 437 struct sctp_nets *net; 438 struct sctp_tcb *stcb; 439 int error; 440 441 /* 442 * XXXRW: Other instances of getcred use SUSER_ALLOWJAIL, as socket 443 * visibility is scoped using cr_canseesocket(), which it is not 444 * here. 445 */ 446 error = priv_check_cred(req->td->td_ucred, PRIV_NETINET_RESERVEDPORT, 447 0); 448 if (error) 449 return (error); 450 451 if (req->newlen != sizeof(addrs)) 452 return (EINVAL); 453 if (req->oldlen != sizeof(struct ucred)) 454 return (EINVAL); 455 error = SYSCTL_IN(req, addrs, sizeof(addrs)); 456 if (error) 457 return (error); 458 459 stcb = sctp_findassociation_addr_sa(sin6tosa(&addrs[0]), 460 sin6tosa(&addrs[1]), 461 &inp, &net, 1); 462 if (stcb == NULL || inp == NULL || inp->sctp_socket == NULL) { 463 if ((inp != NULL) && (stcb == NULL)) { 464 /* reduce ref-count */ 465 SCTP_INP_WLOCK(inp); 466 SCTP_INP_DECR_REF(inp); 467 goto cred_can_cont; 468 } 469 error = ENOENT; 470 goto out; 471 } 472 SCTP_TCB_UNLOCK(stcb); 473 /* 474 * We use the write lock here, only since in the error leg we need 475 * it. If we used RLOCK, then we would have to 476 * wlock/decr/unlock/rlock. Which in theory could create a hole. 477 * Better to use higher wlock. 478 */ 479 SCTP_INP_WLOCK(inp); 480 cred_can_cont: 481 error = cr_canseesocket(req->td->td_ucred, inp->sctp_socket); 482 if (error) { 483 SCTP_INP_WUNLOCK(inp); 484 goto out; 485 } 486 cru2x(inp->sctp_socket->so_cred, &xuc); 487 SCTP_INP_WUNLOCK(inp); 488 error = SYSCTL_OUT(req, &xuc, sizeof(struct xucred)); 489 out: 490 return (error); 491 } 492 493 SYSCTL_PROC(_net_inet6_sctp6, OID_AUTO, getcred, CTLTYPE_OPAQUE | CTLFLAG_RW, 494 0, 0, 495 sctp6_getcred, "S,ucred", "Get the ucred of a SCTP6 connection"); 496 497 498 /* This is the same as the sctp_abort() could be made common */ 499 static void 500 sctp6_abort(struct socket *so) 501 { 502 struct sctp_inpcb *inp; 503 uint32_t flags; 504 505 inp = (struct sctp_inpcb *)so->so_pcb; 506 if (inp == 0) 507 return; 508 sctp_must_try_again: 509 flags = inp->sctp_flags; 510 #ifdef SCTP_LOG_CLOSING 511 sctp_log_closing(inp, NULL, 17); 512 #endif 513 if (((flags & SCTP_PCB_FLAGS_SOCKET_GONE) == 0) && 514 (atomic_cmpset_int(&inp->sctp_flags, flags, (flags | SCTP_PCB_FLAGS_SOCKET_GONE | SCTP_PCB_FLAGS_CLOSE_IP)))) { 515 #ifdef SCTP_LOG_CLOSING 516 sctp_log_closing(inp, NULL, 16); 517 #endif 518 sctp_inpcb_free(inp, 1, 0); 519 SOCK_LOCK(so); 520 so->so_snd.sb_cc = 0; 521 so->so_snd.sb_mb = NULL; 522 so->so_snd.sb_mbcnt = 0; 523 524 /* 525 * same for the rcv ones, they are only here for the 526 * accounting/select. 527 */ 528 so->so_rcv.sb_cc = 0; 529 so->so_rcv.sb_mb = NULL; 530 so->so_rcv.sb_mbcnt = 0; 531 /* 532 * Now null out the reference, we are completely detached. 533 */ 534 so->so_pcb = NULL; 535 SOCK_UNLOCK(so); 536 } else { 537 flags = inp->sctp_flags; 538 if ((flags & SCTP_PCB_FLAGS_SOCKET_GONE) == 0) { 539 goto sctp_must_try_again; 540 } 541 } 542 return; 543 } 544 545 static int 546 sctp6_attach(struct socket *so, int proto, struct thread *p) 547 { 548 struct in6pcb *inp6; 549 int error; 550 struct sctp_inpcb *inp; 551 552 inp = (struct sctp_inpcb *)so->so_pcb; 553 if (inp != NULL) 554 return EINVAL; 555 556 if (so->so_snd.sb_hiwat == 0 || so->so_rcv.sb_hiwat == 0) { 557 error = soreserve(so, sctp_sendspace, sctp_recvspace); 558 if (error) 559 return error; 560 } 561 error = sctp_inpcb_alloc(so); 562 if (error) 563 return error; 564 inp = (struct sctp_inpcb *)so->so_pcb; 565 inp->sctp_flags |= SCTP_PCB_FLAGS_BOUND_V6; /* I'm v6! */ 566 inp6 = (struct in6pcb *)inp; 567 568 inp6->inp_vflag |= INP_IPV6; 569 inp6->in6p_hops = -1; /* use kernel default */ 570 inp6->in6p_cksum = -1; /* just to be sure */ 571 #ifdef INET 572 /* 573 * XXX: ugly!! IPv4 TTL initialization is necessary for an IPv6 574 * socket as well, because the socket may be bound to an IPv6 575 * wildcard address, which may match an IPv4-mapped IPv6 address. 576 */ 577 inp6->inp_ip_ttl = ip_defttl; 578 #endif 579 /* 580 * Hmm what about the IPSEC stuff that is missing here but in 581 * sctp_attach()? 582 */ 583 return 0; 584 } 585 586 static int 587 sctp6_bind(struct socket *so, struct sockaddr *addr, struct thread *p) 588 { 589 struct sctp_inpcb *inp; 590 struct in6pcb *inp6; 591 int error; 592 593 inp = (struct sctp_inpcb *)so->so_pcb; 594 if (inp == 0) 595 return EINVAL; 596 597 inp6 = (struct in6pcb *)inp; 598 inp6->inp_vflag &= ~INP_IPV4; 599 inp6->inp_vflag |= INP_IPV6; 600 if ((addr != NULL) && (SCTP_IPV6_V6ONLY(inp6) == 0)) { 601 if (addr->sa_family == AF_INET) { 602 /* binding v4 addr to v6 socket, so reset flags */ 603 inp6->inp_vflag |= INP_IPV4; 604 inp6->inp_vflag &= ~INP_IPV6; 605 } else { 606 struct sockaddr_in6 *sin6_p; 607 608 sin6_p = (struct sockaddr_in6 *)addr; 609 610 if (IN6_IS_ADDR_UNSPECIFIED(&sin6_p->sin6_addr)) { 611 inp6->inp_vflag |= INP_IPV4; 612 } else if (IN6_IS_ADDR_V4MAPPED(&sin6_p->sin6_addr)) { 613 struct sockaddr_in sin; 614 615 in6_sin6_2_sin(&sin, sin6_p); 616 inp6->inp_vflag |= INP_IPV4; 617 inp6->inp_vflag &= ~INP_IPV6; 618 error = sctp_inpcb_bind(so, (struct sockaddr *)&sin, p); 619 return error; 620 } 621 } 622 } else if (addr != NULL) { 623 /* IPV6_V6ONLY socket */ 624 if (addr->sa_family == AF_INET) { 625 /* can't bind v4 addr to v6 only socket! */ 626 return EINVAL; 627 } else { 628 struct sockaddr_in6 *sin6_p; 629 630 sin6_p = (struct sockaddr_in6 *)addr; 631 632 if (IN6_IS_ADDR_V4MAPPED(&sin6_p->sin6_addr)) 633 /* can't bind v4-mapped addrs either! */ 634 /* NOTE: we don't support SIIT */ 635 return EINVAL; 636 } 637 } 638 error = sctp_inpcb_bind(so, addr, p); 639 return error; 640 } 641 642 643 static void 644 sctp6_close(struct socket *so) 645 { 646 struct sctp_inpcb *inp; 647 uint32_t flags; 648 649 inp = (struct sctp_inpcb *)so->so_pcb; 650 if (inp == 0) 651 return; 652 653 /* 654 * Inform all the lower layer assoc that we are done. 655 */ 656 sctp_must_try_again: 657 flags = inp->sctp_flags; 658 #ifdef SCTP_LOG_CLOSING 659 sctp_log_closing(inp, NULL, 17); 660 #endif 661 if (((flags & SCTP_PCB_FLAGS_SOCKET_GONE) == 0) && 662 (atomic_cmpset_int(&inp->sctp_flags, flags, (flags | SCTP_PCB_FLAGS_SOCKET_GONE | SCTP_PCB_FLAGS_CLOSE_IP)))) { 663 if (((so->so_options & SO_LINGER) && (so->so_linger == 0)) || 664 (so->so_rcv.sb_cc > 0)) { 665 #ifdef SCTP_LOG_CLOSING 666 sctp_log_closing(inp, NULL, 13); 667 #endif 668 sctp_inpcb_free(inp, 1, 1); 669 } else { 670 #ifdef SCTP_LOG_CLOSING 671 sctp_log_closing(inp, NULL, 14); 672 #endif 673 sctp_inpcb_free(inp, 0, 1); 674 } 675 /* 676 * The socket is now detached, no matter what the state of 677 * the SCTP association. 678 */ 679 SOCK_LOCK(so); 680 so->so_snd.sb_cc = 0; 681 so->so_snd.sb_mb = NULL; 682 so->so_snd.sb_mbcnt = 0; 683 684 /* 685 * same for the rcv ones, they are only here for the 686 * accounting/select. 687 */ 688 so->so_rcv.sb_cc = 0; 689 so->so_rcv.sb_mb = NULL; 690 so->so_rcv.sb_mbcnt = 0; 691 /* 692 * Now null out the reference, we are completely detached. 693 */ 694 so->so_pcb = NULL; 695 SOCK_UNLOCK(so); 696 } else { 697 flags = inp->sctp_flags; 698 if ((flags & SCTP_PCB_FLAGS_SOCKET_GONE) == 0) { 699 goto sctp_must_try_again; 700 } 701 } 702 return; 703 704 } 705 706 707 static int 708 sctp6_disconnect(struct socket *so) 709 { 710 struct sctp_inpcb *inp; 711 712 inp = (struct sctp_inpcb *)so->so_pcb; 713 if (inp == NULL) { 714 return (ENOTCONN); 715 } 716 SCTP_INP_RLOCK(inp); 717 if (inp->sctp_flags & SCTP_PCB_FLAGS_TCPTYPE) { 718 if (SCTP_LIST_EMPTY(&inp->sctp_asoc_list)) { 719 /* No connection */ 720 SCTP_INP_RUNLOCK(inp); 721 return (ENOTCONN); 722 } else { 723 int some_on_streamwheel = 0; 724 struct sctp_association *asoc; 725 struct sctp_tcb *stcb; 726 727 stcb = LIST_FIRST(&inp->sctp_asoc_list); 728 if (stcb == NULL) { 729 SCTP_INP_RUNLOCK(inp); 730 return (EINVAL); 731 } 732 SCTP_TCB_LOCK(stcb); 733 asoc = &stcb->asoc; 734 if (((so->so_options & SO_LINGER) && 735 (so->so_linger == 0)) || 736 (so->so_rcv.sb_cc > 0)) { 737 if (SCTP_GET_STATE(asoc) != 738 SCTP_STATE_COOKIE_WAIT) { 739 /* Left with Data unread */ 740 struct mbuf *err; 741 742 err = NULL; 743 MGET(err, M_DONTWAIT, MT_DATA); 744 if (err) { 745 /* 746 * Fill in the user 747 * initiated abort 748 */ 749 struct sctp_paramhdr *ph; 750 751 ph = mtod(err, struct sctp_paramhdr *); 752 SCTP_BUF_LEN(err) = sizeof(struct sctp_paramhdr); 753 ph->param_type = htons(SCTP_CAUSE_USER_INITIATED_ABT); 754 ph->param_length = htons(SCTP_BUF_LEN(err)); 755 } 756 sctp_send_abort_tcb(stcb, err); 757 SCTP_STAT_INCR_COUNTER32(sctps_aborted); 758 } 759 SCTP_INP_RUNLOCK(inp); 760 if ((SCTP_GET_STATE(&stcb->asoc) == SCTP_STATE_OPEN) || 761 (SCTP_GET_STATE(&stcb->asoc) == SCTP_STATE_SHUTDOWN_RECEIVED)) { 762 SCTP_STAT_DECR_GAUGE32(sctps_currestab); 763 } 764 sctp_free_assoc(inp, stcb, SCTP_DONOT_SETSCOPE, 765 SCTP_FROM_SCTP6_USRREQ + SCTP_LOC_2); 766 /* No unlock tcb assoc is gone */ 767 return (0); 768 } 769 if (!TAILQ_EMPTY(&asoc->out_wheel)) { 770 /* Check to see if some data queued */ 771 struct sctp_stream_out *outs; 772 773 TAILQ_FOREACH(outs, &asoc->out_wheel, 774 next_spoke) { 775 if (!TAILQ_EMPTY(&outs->outqueue)) { 776 some_on_streamwheel = 1; 777 break; 778 } 779 } 780 } 781 if (TAILQ_EMPTY(&asoc->send_queue) && 782 TAILQ_EMPTY(&asoc->sent_queue) && 783 (some_on_streamwheel == 0)) { 784 /* nothing queued to send, so I'm done... */ 785 if ((SCTP_GET_STATE(asoc) != 786 SCTP_STATE_SHUTDOWN_SENT) && 787 (SCTP_GET_STATE(asoc) != 788 SCTP_STATE_SHUTDOWN_ACK_SENT)) { 789 /* only send SHUTDOWN the first time */ 790 sctp_send_shutdown(stcb, stcb->asoc.primary_destination); 791 sctp_chunk_output(stcb->sctp_ep, stcb, 1); 792 if ((SCTP_GET_STATE(asoc) == SCTP_STATE_OPEN) || 793 (SCTP_GET_STATE(asoc) == SCTP_STATE_SHUTDOWN_RECEIVED)) { 794 SCTP_STAT_DECR_GAUGE32(sctps_currestab); 795 } 796 asoc->state = SCTP_STATE_SHUTDOWN_SENT; 797 sctp_timer_start(SCTP_TIMER_TYPE_SHUTDOWN, 798 stcb->sctp_ep, stcb, 799 asoc->primary_destination); 800 sctp_timer_start(SCTP_TIMER_TYPE_SHUTDOWNGUARD, 801 stcb->sctp_ep, stcb, 802 asoc->primary_destination); 803 } 804 } else { 805 /* 806 * we still got (or just got) data to send, 807 * so set SHUTDOWN_PENDING 808 */ 809 /* 810 * XXX sockets draft says that MSG_EOF 811 * should be sent with no data. currently, 812 * we will allow user data to be sent first 813 * and move to SHUTDOWN-PENDING 814 */ 815 asoc->state |= SCTP_STATE_SHUTDOWN_PENDING; 816 } 817 SCTP_TCB_UNLOCK(stcb); 818 SCTP_INP_RUNLOCK(inp); 819 return (0); 820 } 821 } else { 822 /* UDP model does not support this */ 823 SCTP_INP_RUNLOCK(inp); 824 return EOPNOTSUPP; 825 } 826 } 827 828 int 829 sctp_sendm(struct socket *so, int flags, struct mbuf *m, struct sockaddr *addr, 830 struct mbuf *control, struct thread *p); 831 832 833 834 static int 835 sctp6_send(struct socket *so, int flags, struct mbuf *m, struct sockaddr *addr, 836 struct mbuf *control, struct thread *p) 837 { 838 struct sctp_inpcb *inp; 839 struct inpcb *in_inp; 840 struct in6pcb *inp6; 841 842 #ifdef INET 843 struct sockaddr_in6 *sin6; 844 845 #endif /* INET */ 846 /* No SPL needed since sctp_output does this */ 847 848 inp = (struct sctp_inpcb *)so->so_pcb; 849 if (inp == NULL) { 850 if (control) { 851 m_freem(control); 852 control = NULL; 853 } 854 m_freem(m); 855 return EINVAL; 856 } 857 in_inp = (struct inpcb *)inp; 858 inp6 = (struct in6pcb *)inp; 859 /* 860 * For the TCP model we may get a NULL addr, if we are a connected 861 * socket thats ok. 862 */ 863 if ((inp->sctp_flags & SCTP_PCB_FLAGS_CONNECTED) && 864 (addr == NULL)) { 865 goto connected_type; 866 } 867 if (addr == NULL) { 868 m_freem(m); 869 if (control) { 870 m_freem(control); 871 control = NULL; 872 } 873 return (EDESTADDRREQ); 874 } 875 #ifdef INET 876 sin6 = (struct sockaddr_in6 *)addr; 877 if (SCTP_IPV6_V6ONLY(inp6)) { 878 /* 879 * if IPV6_V6ONLY flag, we discard datagrams destined to a 880 * v4 addr or v4-mapped addr 881 */ 882 if (addr->sa_family == AF_INET) { 883 return EINVAL; 884 } 885 if (IN6_IS_ADDR_V4MAPPED(&sin6->sin6_addr)) { 886 return EINVAL; 887 } 888 } 889 if (IN6_IS_ADDR_V4MAPPED(&sin6->sin6_addr)) { 890 if (!ip6_v6only) { 891 struct sockaddr_in sin; 892 893 /* convert v4-mapped into v4 addr and send */ 894 in6_sin6_2_sin(&sin, sin6); 895 return sctp_sendm(so, flags, m, (struct sockaddr *)&sin, 896 control, p); 897 } else { 898 /* mapped addresses aren't enabled */ 899 return EINVAL; 900 } 901 } 902 #endif /* INET */ 903 connected_type: 904 /* now what about control */ 905 if (control) { 906 if (inp->control) { 907 printf("huh? control set?\n"); 908 m_freem(inp->control); 909 inp->control = NULL; 910 } 911 inp->control = control; 912 } 913 /* Place the data */ 914 if (inp->pkt) { 915 SCTP_BUF_NEXT(inp->pkt_last) = m; 916 inp->pkt_last = m; 917 } else { 918 inp->pkt_last = inp->pkt = m; 919 } 920 if ( 921 /* FreeBSD and MacOSX uses a flag passed */ 922 ((flags & PRUS_MORETOCOME) == 0) 923 ) { 924 /* 925 * note with the current version this code will only be used 926 * by OpenBSD, NetBSD and FreeBSD have methods for 927 * re-defining sosend() to use sctp_sosend(). One can 928 * optionaly switch back to this code (by changing back the 929 * defininitions but this is not advisable. 930 */ 931 int ret; 932 933 ret = sctp_output(inp, inp->pkt, addr, inp->control, p, flags); 934 inp->pkt = NULL; 935 inp->control = NULL; 936 return (ret); 937 } else { 938 return (0); 939 } 940 } 941 942 static int 943 sctp6_connect(struct socket *so, struct sockaddr *addr, struct thread *p) 944 { 945 int error = 0; 946 struct sctp_inpcb *inp; 947 struct in6pcb *inp6; 948 struct sctp_tcb *stcb; 949 950 #ifdef INET 951 struct sockaddr_in6 *sin6; 952 struct sockaddr_storage ss; 953 954 #endif /* INET */ 955 956 inp6 = (struct in6pcb *)so->so_pcb; 957 inp = (struct sctp_inpcb *)so->so_pcb; 958 if (inp == 0) { 959 return (ECONNRESET); /* I made the same as TCP since we are 960 * not setup? */ 961 } 962 SCTP_ASOC_CREATE_LOCK(inp); 963 SCTP_INP_RLOCK(inp); 964 if ((inp->sctp_flags & SCTP_PCB_FLAGS_UNBOUND) == 965 SCTP_PCB_FLAGS_UNBOUND) { 966 /* Bind a ephemeral port */ 967 SCTP_INP_RUNLOCK(inp); 968 error = sctp6_bind(so, NULL, p); 969 if (error) { 970 SCTP_ASOC_CREATE_UNLOCK(inp); 971 972 return (error); 973 } 974 SCTP_INP_RLOCK(inp); 975 } 976 if ((inp->sctp_flags & SCTP_PCB_FLAGS_TCPTYPE) && 977 (inp->sctp_flags & SCTP_PCB_FLAGS_CONNECTED)) { 978 /* We are already connected AND the TCP model */ 979 SCTP_INP_RUNLOCK(inp); 980 SCTP_ASOC_CREATE_UNLOCK(inp); 981 return (EADDRINUSE); 982 } 983 #ifdef INET 984 sin6 = (struct sockaddr_in6 *)addr; 985 if (SCTP_IPV6_V6ONLY(inp6)) { 986 /* 987 * if IPV6_V6ONLY flag, ignore connections destined to a v4 988 * addr or v4-mapped addr 989 */ 990 if (addr->sa_family == AF_INET) { 991 SCTP_INP_RUNLOCK(inp); 992 SCTP_ASOC_CREATE_UNLOCK(inp); 993 return EINVAL; 994 } 995 if (IN6_IS_ADDR_V4MAPPED(&sin6->sin6_addr)) { 996 SCTP_INP_RUNLOCK(inp); 997 SCTP_ASOC_CREATE_UNLOCK(inp); 998 return EINVAL; 999 } 1000 } 1001 if (IN6_IS_ADDR_V4MAPPED(&sin6->sin6_addr)) { 1002 if (!ip6_v6only) { 1003 /* convert v4-mapped into v4 addr */ 1004 in6_sin6_2_sin((struct sockaddr_in *)&ss, sin6); 1005 addr = (struct sockaddr *)&ss; 1006 } else { 1007 /* mapped addresses aren't enabled */ 1008 SCTP_INP_RUNLOCK(inp); 1009 SCTP_ASOC_CREATE_UNLOCK(inp); 1010 return EINVAL; 1011 } 1012 } else 1013 #endif /* INET */ 1014 addr = addr; /* for true v6 address case */ 1015 1016 /* Now do we connect? */ 1017 if (inp->sctp_flags & SCTP_PCB_FLAGS_CONNECTED) { 1018 stcb = LIST_FIRST(&inp->sctp_asoc_list); 1019 if (stcb) 1020 SCTP_TCB_UNLOCK(stcb); 1021 SCTP_INP_RUNLOCK(inp); 1022 } else { 1023 SCTP_INP_RUNLOCK(inp); 1024 SCTP_INP_WLOCK(inp); 1025 SCTP_INP_INCR_REF(inp); 1026 SCTP_INP_WUNLOCK(inp); 1027 stcb = sctp_findassociation_ep_addr(&inp, addr, NULL, NULL, NULL); 1028 if (stcb == NULL) { 1029 SCTP_INP_WLOCK(inp); 1030 SCTP_INP_DECR_REF(inp); 1031 SCTP_INP_WUNLOCK(inp); 1032 } 1033 } 1034 1035 if (stcb != NULL) { 1036 /* Already have or am bring up an association */ 1037 SCTP_ASOC_CREATE_UNLOCK(inp); 1038 SCTP_TCB_UNLOCK(stcb); 1039 return (EALREADY); 1040 } 1041 /* We are GOOD to go */ 1042 stcb = sctp_aloc_assoc(inp, addr, 1, &error, 0); 1043 SCTP_ASOC_CREATE_UNLOCK(inp); 1044 if (stcb == NULL) { 1045 /* Gak! no memory */ 1046 return (error); 1047 } 1048 if (stcb->sctp_ep->sctp_flags & SCTP_PCB_FLAGS_TCPTYPE) { 1049 stcb->sctp_ep->sctp_flags |= SCTP_PCB_FLAGS_CONNECTED; 1050 /* Set the connected flag so we can queue data */ 1051 soisconnecting(so); 1052 } 1053 stcb->asoc.state = SCTP_STATE_COOKIE_WAIT; 1054 SCTP_GETTIME_TIMEVAL(&stcb->asoc.time_entered); 1055 1056 /* initialize authentication parameters for the assoc */ 1057 sctp_initialize_auth_params(inp, stcb); 1058 1059 sctp_send_initiate(inp, stcb); 1060 SCTP_TCB_UNLOCK(stcb); 1061 return error; 1062 } 1063 1064 static int 1065 sctp6_getaddr(struct socket *so, struct sockaddr **addr) 1066 { 1067 struct sockaddr_in6 *sin6; 1068 1069 struct sctp_inpcb *inp; 1070 1071 int error; 1072 1073 1074 /* 1075 * Do the malloc first in case it blocks. 1076 */ 1077 SCTP_MALLOC_SONAME(sin6, struct sockaddr_in6 *, sizeof *sin6); 1078 sin6->sin6_family = AF_INET6; 1079 sin6->sin6_len = sizeof(*sin6); 1080 1081 inp = (struct sctp_inpcb *)so->so_pcb; 1082 if (inp == NULL) { 1083 SCTP_FREE_SONAME(sin6); 1084 return ECONNRESET; 1085 } 1086 SCTP_INP_RLOCK(inp); 1087 sin6->sin6_port = inp->sctp_lport; 1088 if (inp->sctp_flags & SCTP_PCB_FLAGS_BOUNDALL) { 1089 /* For the bound all case you get back 0 */ 1090 if (inp->sctp_flags & SCTP_PCB_FLAGS_CONNECTED) { 1091 struct sctp_tcb *stcb; 1092 struct sockaddr_in6 *sin_a6; 1093 struct sctp_nets *net; 1094 int fnd; 1095 1096 stcb = LIST_FIRST(&inp->sctp_asoc_list); 1097 if (stcb == NULL) { 1098 goto notConn6; 1099 } 1100 fnd = 0; 1101 sin_a6 = NULL; 1102 TAILQ_FOREACH(net, &stcb->asoc.nets, sctp_next) { 1103 sin_a6 = (struct sockaddr_in6 *)&net->ro._l_addr; 1104 if (sin_a6 == NULL) 1105 /* this will make coverity happy */ 1106 continue; 1107 1108 if (sin_a6->sin6_family == AF_INET6) { 1109 fnd = 1; 1110 break; 1111 } 1112 } 1113 if ((!fnd) || (sin_a6 == NULL)) { 1114 /* punt */ 1115 goto notConn6; 1116 } 1117 sin6->sin6_addr = sctp_ipv6_source_address_selection( 1118 inp, stcb, (struct route *)&net->ro, net, 0); 1119 1120 } else { 1121 /* For the bound all case you get back 0 */ 1122 notConn6: 1123 memset(&sin6->sin6_addr, 0, sizeof(sin6->sin6_addr)); 1124 } 1125 } else { 1126 /* Take the first IPv6 address in the list */ 1127 struct sctp_laddr *laddr; 1128 int fnd = 0; 1129 1130 LIST_FOREACH(laddr, &inp->sctp_addr_list, sctp_nxt_addr) { 1131 if (laddr->ifa->ifa_addr->sa_family == AF_INET6) { 1132 struct sockaddr_in6 *sin_a; 1133 1134 sin_a = (struct sockaddr_in6 *)laddr->ifa->ifa_addr; 1135 sin6->sin6_addr = sin_a->sin6_addr; 1136 fnd = 1; 1137 break; 1138 } 1139 } 1140 if (!fnd) { 1141 SCTP_FREE_SONAME(sin6); 1142 SCTP_INP_RUNLOCK(inp); 1143 return ENOENT; 1144 } 1145 } 1146 SCTP_INP_RUNLOCK(inp); 1147 /* Scoping things for v6 */ 1148 if ((error = sa6_recoverscope(sin6)) != 0) { 1149 SCTP_FREE_SONAME(sin6); 1150 return (error); 1151 } 1152 (*addr) = (struct sockaddr *)sin6; 1153 return (0); 1154 } 1155 1156 static int 1157 sctp6_peeraddr(struct socket *so, struct sockaddr **addr) 1158 { 1159 struct sockaddr_in6 *sin6 = (struct sockaddr_in6 *)*addr; 1160 1161 int fnd; 1162 struct sockaddr_in6 *sin_a6; 1163 struct sctp_inpcb *inp; 1164 struct sctp_tcb *stcb; 1165 struct sctp_nets *net; 1166 1167 int error; 1168 1169 1170 /* 1171 * Do the malloc first in case it blocks. 1172 */ 1173 inp = (struct sctp_inpcb *)so->so_pcb; 1174 if ((inp->sctp_flags & SCTP_PCB_FLAGS_CONNECTED) == 0) { 1175 /* UDP type and listeners will drop out here */ 1176 return (ENOTCONN); 1177 } 1178 SCTP_MALLOC_SONAME(sin6, struct sockaddr_in6 *, sizeof *sin6); 1179 sin6->sin6_family = AF_INET6; 1180 sin6->sin6_len = sizeof(*sin6); 1181 1182 /* We must recapture incase we blocked */ 1183 inp = (struct sctp_inpcb *)so->so_pcb; 1184 if (inp == NULL) { 1185 SCTP_FREE_SONAME(sin6); 1186 return ECONNRESET; 1187 } 1188 SCTP_INP_RLOCK(inp); 1189 stcb = LIST_FIRST(&inp->sctp_asoc_list); 1190 if (stcb) 1191 SCTP_TCB_LOCK(stcb); 1192 SCTP_INP_RUNLOCK(inp); 1193 if (stcb == NULL) { 1194 SCTP_FREE_SONAME(sin6); 1195 return ECONNRESET; 1196 } 1197 fnd = 0; 1198 TAILQ_FOREACH(net, &stcb->asoc.nets, sctp_next) { 1199 sin_a6 = (struct sockaddr_in6 *)&net->ro._l_addr; 1200 if (sin_a6->sin6_family == AF_INET6) { 1201 fnd = 1; 1202 sin6->sin6_port = stcb->rport; 1203 sin6->sin6_addr = sin_a6->sin6_addr; 1204 break; 1205 } 1206 } 1207 SCTP_TCB_UNLOCK(stcb); 1208 if (!fnd) { 1209 /* No IPv4 address */ 1210 SCTP_FREE_SONAME(sin6); 1211 return ENOENT; 1212 } 1213 if ((error = sa6_recoverscope(sin6)) != 0) 1214 return (error); 1215 *addr = (struct sockaddr *)sin6; 1216 return (0); 1217 } 1218 1219 static int 1220 sctp6_in6getaddr(struct socket *so, struct sockaddr **nam) 1221 { 1222 struct sockaddr *addr; 1223 1224 struct in6pcb *inp6 = sotoin6pcb(so); 1225 int error; 1226 1227 if (inp6 == NULL) 1228 return EINVAL; 1229 1230 /* allow v6 addresses precedence */ 1231 error = sctp6_getaddr(so, nam); 1232 if (error) { 1233 /* try v4 next if v6 failed */ 1234 error = sctp_ingetaddr(so, nam); 1235 if (error) { 1236 return (error); 1237 } 1238 addr = *nam; 1239 /* if I'm V6ONLY, convert it to v4-mapped */ 1240 if (SCTP_IPV6_V6ONLY(inp6)) { 1241 struct sockaddr_in6 sin6; 1242 1243 in6_sin_2_v4mapsin6((struct sockaddr_in *)addr, &sin6); 1244 memcpy(addr, &sin6, sizeof(struct sockaddr_in6)); 1245 } 1246 } 1247 return (error); 1248 } 1249 1250 1251 static int 1252 sctp6_getpeeraddr(struct socket *so, struct sockaddr **nam) 1253 { 1254 struct sockaddr *addr = *nam; 1255 1256 struct in6pcb *inp6 = sotoin6pcb(so); 1257 int error; 1258 1259 if (inp6 == NULL) 1260 return EINVAL; 1261 1262 /* allow v6 addresses precedence */ 1263 error = sctp6_peeraddr(so, nam); 1264 if (error) { 1265 /* try v4 next if v6 failed */ 1266 error = sctp_peeraddr(so, nam); 1267 if (error) { 1268 return (error); 1269 } 1270 /* if I'm V6ONLY, convert it to v4-mapped */ 1271 if (SCTP_IPV6_V6ONLY(inp6)) { 1272 struct sockaddr_in6 sin6; 1273 1274 in6_sin_2_v4mapsin6((struct sockaddr_in *)addr, &sin6); 1275 memcpy(addr, &sin6, sizeof(struct sockaddr_in6)); 1276 } 1277 } 1278 return error; 1279 } 1280 1281 struct pr_usrreqs sctp6_usrreqs = { 1282 .pru_abort = sctp6_abort, 1283 .pru_accept = sctp_accept, 1284 .pru_attach = sctp6_attach, 1285 .pru_bind = sctp6_bind, 1286 .pru_connect = sctp6_connect, 1287 .pru_control = in6_control, 1288 .pru_close = sctp6_close, 1289 .pru_detach = sctp6_close, 1290 .pru_sopoll = sopoll_generic, 1291 .pru_disconnect = sctp6_disconnect, 1292 .pru_listen = sctp_listen, 1293 .pru_peeraddr = sctp6_getpeeraddr, 1294 .pru_send = sctp6_send, 1295 .pru_shutdown = sctp_shutdown, 1296 .pru_sockaddr = sctp6_in6getaddr, 1297 .pru_sosend = sctp_sosend, 1298 .pru_soreceive = sctp_soreceive 1299 }; 1300