sctp6_usrreq.c revision 235828
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: head/sys/netinet6/sctp6_usrreq.c 235828 2012-05-23 11:26:28Z tuexen $"); 35 36#include <netinet/sctp_os.h> 37#include <sys/proc.h> 38#include <netinet/sctp_pcb.h> 39#include <netinet/sctp_header.h> 40#include <netinet/sctp_var.h> 41#if defined(INET6) 42#include <netinet6/sctp6_var.h> 43#endif 44#include <netinet/sctp_sysctl.h> 45#include <netinet/sctp_output.h> 46#include <netinet/sctp_uio.h> 47#include <netinet/sctp_asconf.h> 48#include <netinet/sctputil.h> 49#include <netinet/sctp_indata.h> 50#include <netinet/sctp_timer.h> 51#include <netinet/sctp_auth.h> 52#include <netinet/sctp_input.h> 53#include <netinet/sctp_output.h> 54#include <netinet/sctp_bsd_addr.h> 55#include <netinet/sctp_crc32.h> 56#include <netinet/udp.h> 57 58#ifdef IPSEC 59#include <netipsec/ipsec.h> 60#if defined(INET6) 61#include <netipsec/ipsec6.h> 62#endif /* INET6 */ 63#endif /* IPSEC */ 64 65extern struct protosw inetsw[]; 66 67int 68sctp6_input(struct mbuf **i_pak, int *offp, int proto) 69{ 70 struct mbuf *m; 71 struct ip6_hdr *ip6; 72 struct sctphdr *sh; 73 struct sctp_inpcb *in6p = NULL; 74 struct sctp_nets *net; 75 int refcount_up = 0; 76 uint32_t vrf_id = 0; 77 78#ifdef IPSEC 79 struct inpcb *in6p_ip; 80 81#endif 82 struct sctp_chunkhdr *ch; 83 int length, offset, iphlen; 84 uint8_t ecn_bits; 85 struct sctp_tcb *stcb = NULL; 86 int pkt_len = 0; 87 88#if !defined(SCTP_WITH_NO_CSUM) 89 uint32_t check, calc_check; 90 91#endif 92 int off = *offp; 93 uint16_t port = 0; 94 95 /* get the VRF and table id's */ 96 if (SCTP_GET_PKT_VRFID(*i_pak, vrf_id)) { 97 SCTP_RELEASE_PKT(*i_pak); 98 return (-1); 99 } 100 m = SCTP_HEADER_TO_CHAIN(*i_pak); 101 pkt_len = SCTP_HEADER_LEN((*i_pak)); 102 103#ifdef SCTP_PACKET_LOGGING 104 sctp_packet_log(m, pkt_len); 105#endif 106 ip6 = mtod(m, struct ip6_hdr *); 107 /* Ensure that (sctphdr + sctp_chunkhdr) in a row. */ 108 IP6_EXTHDR_GET(sh, struct sctphdr *, m, off, 109 (int)(sizeof(*sh) + sizeof(*ch))); 110 if (sh == NULL) { 111 SCTP_STAT_INCR(sctps_hdrops); 112 return (IPPROTO_DONE); 113 } 114 ch = (struct sctp_chunkhdr *)((caddr_t)sh + sizeof(struct sctphdr)); 115 iphlen = off; 116 offset = iphlen + sizeof(*sh) + sizeof(*ch); 117 SCTPDBG(SCTP_DEBUG_INPUT1, 118 "sctp6_input() length:%d iphlen:%d\n", pkt_len, iphlen); 119 120 121#if defined(NFAITH) && NFAITH > 0 122 123 if (faithprefix_p != NULL && (*faithprefix_p) (&ip6->ip6_dst)) { 124 /* XXX send icmp6 host/port unreach? */ 125 goto bad; 126 } 127#endif /* NFAITH defined and > 0 */ 128 SCTP_STAT_INCR(sctps_recvpackets); 129 SCTP_STAT_INCR_COUNTER64(sctps_inpackets); 130 SCTPDBG(SCTP_DEBUG_INPUT1, "V6 input gets a packet iphlen:%d pktlen:%d\n", 131 iphlen, pkt_len); 132 if (IN6_IS_ADDR_MULTICAST(&ip6->ip6_dst)) { 133 /* No multi-cast support in SCTP */ 134 goto bad; 135 } 136 /* destination port of 0 is illegal, based on RFC2960. */ 137 if (sh->dest_port == 0) 138 goto bad; 139 140 SCTPDBG(SCTP_DEBUG_CRCOFFLOAD, 141 "sctp_input(): Packet of length %d received on %s with csum_flags 0x%x.\n", 142 m->m_pkthdr.len, 143 if_name(m->m_pkthdr.rcvif), 144 m->m_pkthdr.csum_flags); 145#if defined(SCTP_WITH_NO_CSUM) 146 SCTP_STAT_INCR(sctps_recvnocrc); 147#else 148 if (m->m_pkthdr.csum_flags & CSUM_SCTP_VALID) { 149 SCTP_STAT_INCR(sctps_recvhwcrc); 150 goto sctp_skip_csum; 151 } 152 check = sh->checksum; /* save incoming checksum */ 153 if ((check == 0) && (SCTP_BASE_SYSCTL(sctp_no_csum_on_loopback)) && 154 (IN6_ARE_ADDR_EQUAL(&ip6->ip6_src, &ip6->ip6_dst))) { 155 SCTP_STAT_INCR(sctps_recvnocrc); 156 goto sctp_skip_csum; 157 } 158 sh->checksum = 0; /* prepare for calc */ 159 calc_check = sctp_calculate_cksum(m, iphlen); 160 SCTP_STAT_INCR(sctps_recvswcrc); 161 if (calc_check != check) { 162 SCTPDBG(SCTP_DEBUG_INPUT1, "Bad CSUM on SCTP packet calc_check:%x check:%x m:%p phlen:%d\n", 163 calc_check, check, m, iphlen); 164 stcb = sctp_findassociation_addr(m, offset - sizeof(*ch), 165 sh, ch, &in6p, &net, vrf_id); 166 if ((net) && (port)) { 167 if (net->port == 0) { 168 sctp_pathmtu_adjustment(stcb, net->mtu - sizeof(struct udphdr)); 169 } 170 net->port = port; 171 } 172 if ((net != NULL) && (m->m_flags & M_FLOWID)) { 173 net->flowid = m->m_pkthdr.flowid; 174#ifdef INVARIANTS 175 net->flowidset = 1; 176#endif 177 } 178 /* in6p's ref-count increased && stcb locked */ 179 if ((in6p) && (stcb)) { 180 sctp_send_packet_dropped(stcb, net, m, iphlen, 1); 181 sctp_chunk_output((struct sctp_inpcb *)in6p, stcb, SCTP_OUTPUT_FROM_INPUT_ERROR, SCTP_SO_NOT_LOCKED); 182 } else if ((in6p != NULL) && (stcb == NULL)) { 183 refcount_up = 1; 184 } 185 SCTP_STAT_INCR(sctps_badsum); 186 SCTP_STAT_INCR_COUNTER32(sctps_checksumerrors); 187 goto bad; 188 } 189 sh->checksum = calc_check; 190 191sctp_skip_csum: 192#endif 193 net = NULL; 194 /* 195 * Locate pcb and tcb for datagram sctp_findassociation_addr() wants 196 * IP/SCTP/first chunk header... 197 */ 198 stcb = sctp_findassociation_addr(m, offset - sizeof(*ch), 199 sh, ch, &in6p, &net, vrf_id); 200 if ((net) && (port)) { 201 if (net->port == 0) { 202 sctp_pathmtu_adjustment(stcb, net->mtu - sizeof(struct udphdr)); 203 } 204 net->port = port; 205 } 206 if ((net != NULL) && (m->m_flags & M_FLOWID)) { 207 net->flowid = m->m_pkthdr.flowid; 208#ifdef INVARIANTS 209 net->flowidset = 1; 210#endif 211 } 212 /* in6p's ref-count increased */ 213 if (in6p == NULL) { 214 struct sctp_init_chunk *init_chk, chunk_buf; 215 216 SCTP_STAT_INCR(sctps_noport); 217 if (ch->chunk_type == SCTP_INITIATION) { 218 /* 219 * we do a trick here to get the INIT tag, dig in 220 * and get the tag from the INIT and put it in the 221 * common header. 222 */ 223 init_chk = (struct sctp_init_chunk *)sctp_m_getptr(m, 224 iphlen + sizeof(*sh), sizeof(*init_chk), 225 (uint8_t *) & chunk_buf); 226 if (init_chk) 227 sh->v_tag = init_chk->init.initiate_tag; 228 else 229 sh->v_tag = 0; 230 } 231 if (ch->chunk_type == SCTP_SHUTDOWN_ACK) { 232 sctp_send_shutdown_complete2(m, sh, vrf_id, port); 233 goto bad; 234 } 235 if (ch->chunk_type == SCTP_SHUTDOWN_COMPLETE) { 236 goto bad; 237 } 238 if (ch->chunk_type != SCTP_ABORT_ASSOCIATION) { 239 if ((SCTP_BASE_SYSCTL(sctp_blackhole) == 0) || 240 ((SCTP_BASE_SYSCTL(sctp_blackhole) == 1) && 241 (ch->chunk_type != SCTP_INIT))) { 242 sctp_send_abort(m, iphlen, sh, 0, NULL, vrf_id, port); 243 } 244 } 245 goto bad; 246 } else if (stcb == NULL) { 247 refcount_up = 1; 248 } 249#ifdef IPSEC 250 /* 251 * Check AH/ESP integrity. 252 */ 253 in6p_ip = (struct inpcb *)in6p; 254 if (in6p_ip && (ipsec6_in_reject(m, in6p_ip))) { 255/* XXX */ 256 MODULE_GLOBAL(ipsec6stat).in_polvio++; 257 goto bad; 258 } 259#endif /* IPSEC */ 260 261 /* 262 * CONTROL chunk processing 263 */ 264 offset -= sizeof(*ch); 265 ecn_bits = ((ntohl(ip6->ip6_flow) >> 20) & 0x000000ff); 266 267 /* Length now holds the total packet length payload + iphlen */ 268 length = ntohs(ip6->ip6_plen) + iphlen; 269 270 /* sa_ignore NO_NULL_CHK */ 271 sctp_common_input_processing(&m, iphlen, offset, length, sh, ch, 272 in6p, stcb, net, ecn_bits, vrf_id, port); 273 /* inp's ref-count reduced && stcb unlocked */ 274 /* XXX this stuff below gets moved to appropriate parts later... */ 275 if (m) 276 sctp_m_freem(m); 277 if ((in6p) && refcount_up) { 278 /* reduce ref-count */ 279 SCTP_INP_WLOCK(in6p); 280 SCTP_INP_DECR_REF(in6p); 281 SCTP_INP_WUNLOCK(in6p); 282 } 283 return (IPPROTO_DONE); 284 285bad: 286 if (stcb) { 287 SCTP_TCB_UNLOCK(stcb); 288 } 289 if ((in6p) && refcount_up) { 290 /* reduce ref-count */ 291 SCTP_INP_WLOCK(in6p); 292 SCTP_INP_DECR_REF(in6p); 293 SCTP_INP_WUNLOCK(in6p); 294 } 295 if (m) 296 sctp_m_freem(m); 297 return (IPPROTO_DONE); 298} 299 300 301static void 302sctp6_notify_mbuf(struct sctp_inpcb *inp, struct icmp6_hdr *icmp6, 303 struct sctphdr *sh, struct sctp_tcb *stcb, struct sctp_nets *net) 304{ 305 uint32_t nxtsz; 306 307 if ((inp == NULL) || (stcb == NULL) || (net == NULL) || 308 (icmp6 == NULL) || (sh == NULL)) { 309 goto out; 310 } 311 /* First do we even look at it? */ 312 if (ntohl(sh->v_tag) != (stcb->asoc.peer_vtag)) 313 goto out; 314 315 if (icmp6->icmp6_type != ICMP6_PACKET_TOO_BIG) { 316 /* not PACKET TO BIG */ 317 goto out; 318 } 319 /* 320 * ok we need to look closely. We could even get smarter and look at 321 * anyone that we sent to in case we get a different ICMP that tells 322 * us there is no way to reach a host, but for this impl, all we 323 * care about is MTU discovery. 324 */ 325 nxtsz = ntohl(icmp6->icmp6_mtu); 326 /* Stop any PMTU timer */ 327 sctp_timer_stop(SCTP_TIMER_TYPE_PATHMTURAISE, inp, stcb, NULL, SCTP_FROM_SCTP6_USRREQ + SCTP_LOC_1); 328 329 /* Adjust destination size limit */ 330 if (net->mtu > nxtsz) { 331 net->mtu = nxtsz; 332 if (net->port) { 333 net->mtu -= sizeof(struct udphdr); 334 } 335 } 336 /* now what about the ep? */ 337 if (stcb->asoc.smallest_mtu > nxtsz) { 338 struct sctp_tmit_chunk *chk; 339 340 /* Adjust that too */ 341 stcb->asoc.smallest_mtu = nxtsz; 342 /* now off to subtract IP_DF flag if needed */ 343 344 TAILQ_FOREACH(chk, &stcb->asoc.send_queue, sctp_next) { 345 if ((uint32_t) (chk->send_size + IP_HDR_SIZE) > nxtsz) { 346 chk->flags |= CHUNK_FLAGS_FRAGMENT_OK; 347 } 348 } 349 TAILQ_FOREACH(chk, &stcb->asoc.sent_queue, sctp_next) { 350 if ((uint32_t) (chk->send_size + IP_HDR_SIZE) > nxtsz) { 351 /* 352 * For this guy we also mark for immediate 353 * resend since we sent to big of chunk 354 */ 355 chk->flags |= CHUNK_FLAGS_FRAGMENT_OK; 356 if (chk->sent != SCTP_DATAGRAM_RESEND) 357 stcb->asoc.sent_queue_retran_cnt++; 358 chk->sent = SCTP_DATAGRAM_RESEND; 359 chk->rec.data.doing_fast_retransmit = 0; 360 361 chk->sent = SCTP_DATAGRAM_RESEND; 362 /* Clear any time so NO RTT is being done */ 363 chk->sent_rcv_time.tv_sec = 0; 364 chk->sent_rcv_time.tv_usec = 0; 365 stcb->asoc.total_flight -= chk->send_size; 366 net->flight_size -= chk->send_size; 367 } 368 } 369 } 370 sctp_timer_start(SCTP_TIMER_TYPE_PATHMTURAISE, inp, stcb, NULL); 371out: 372 if (stcb) { 373 SCTP_TCB_UNLOCK(stcb); 374 } 375} 376 377 378void 379sctp6_notify(struct sctp_inpcb *inp, 380 struct icmp6_hdr *icmph, 381 struct sctphdr *sh, 382 struct sockaddr *to, 383 struct sctp_tcb *stcb, 384 struct sctp_nets *net) 385{ 386#if defined (__APPLE__) || defined(SCTP_SO_LOCK_TESTING) 387 struct socket *so; 388 389#endif 390 391 /* protection */ 392 if ((inp == NULL) || (stcb == NULL) || (net == NULL) || 393 (sh == NULL) || (to == NULL)) { 394 if (stcb) 395 SCTP_TCB_UNLOCK(stcb); 396 return; 397 } 398 /* First job is to verify the vtag matches what I would send */ 399 if (ntohl(sh->v_tag) != (stcb->asoc.peer_vtag)) { 400 SCTP_TCB_UNLOCK(stcb); 401 return; 402 } 403 if (icmph->icmp6_type != ICMP_UNREACH) { 404 /* We only care about unreachable */ 405 SCTP_TCB_UNLOCK(stcb); 406 return; 407 } 408 if ((icmph->icmp6_code == ICMP_UNREACH_NET) || 409 (icmph->icmp6_code == ICMP_UNREACH_HOST) || 410 (icmph->icmp6_code == ICMP_UNREACH_NET_UNKNOWN) || 411 (icmph->icmp6_code == ICMP_UNREACH_HOST_UNKNOWN) || 412 (icmph->icmp6_code == ICMP_UNREACH_ISOLATED) || 413 (icmph->icmp6_code == ICMP_UNREACH_NET_PROHIB) || 414 (icmph->icmp6_code == ICMP_UNREACH_HOST_PROHIB) || 415 (icmph->icmp6_code == ICMP_UNREACH_FILTER_PROHIB)) { 416 417 /* 418 * Hmm reachablity problems we must examine closely. If its 419 * not reachable, we may have lost a network. Or if there is 420 * NO protocol at the other end named SCTP. well we consider 421 * it a OOTB abort. 422 */ 423 if (net->dest_state & SCTP_ADDR_REACHABLE) { 424 /* Ok that destination is NOT reachable */ 425 net->dest_state &= ~SCTP_ADDR_REACHABLE; 426 net->dest_state &= ~SCTP_ADDR_PF; 427 sctp_ulp_notify(SCTP_NOTIFY_INTERFACE_DOWN, 428 stcb, 0, (void *)net, SCTP_SO_NOT_LOCKED); 429 } 430 SCTP_TCB_UNLOCK(stcb); 431 } else if ((icmph->icmp6_code == ICMP_UNREACH_PROTOCOL) || 432 (icmph->icmp6_code == ICMP_UNREACH_PORT)) { 433 /* 434 * Here the peer is either playing tricks on us, including 435 * an address that belongs to someone who does not support 436 * SCTP OR was a userland implementation that shutdown and 437 * now is dead. In either case treat it like a OOTB abort 438 * with no TCB 439 */ 440 sctp_abort_notification(stcb, 1, 0, NULL, SCTP_SO_NOT_LOCKED); 441#if defined (__APPLE__) || defined(SCTP_SO_LOCK_TESTING) 442 so = SCTP_INP_SO(inp); 443 atomic_add_int(&stcb->asoc.refcnt, 1); 444 SCTP_TCB_UNLOCK(stcb); 445 SCTP_SOCKET_LOCK(so, 1); 446 SCTP_TCB_LOCK(stcb); 447 atomic_subtract_int(&stcb->asoc.refcnt, 1); 448#endif 449 (void)sctp_free_assoc(inp, stcb, SCTP_NORMAL_PROC, SCTP_FROM_SCTP_USRREQ + SCTP_LOC_2); 450#if defined (__APPLE__) || defined(SCTP_SO_LOCK_TESTING) 451 SCTP_SOCKET_UNLOCK(so, 1); 452 /* SCTP_TCB_UNLOCK(stcb); MT: I think this is not needed. */ 453#endif 454 /* no need to unlock here, since the TCB is gone */ 455 } else { 456 SCTP_TCB_UNLOCK(stcb); 457 } 458} 459 460 461 462void 463sctp6_ctlinput(int cmd, struct sockaddr *pktdst, void *d) 464{ 465 struct sctphdr sh; 466 struct ip6ctlparam *ip6cp = NULL; 467 uint32_t vrf_id; 468 469 vrf_id = SCTP_DEFAULT_VRFID; 470 471 if (pktdst->sa_family != AF_INET6 || 472 pktdst->sa_len != sizeof(struct sockaddr_in6)) 473 return; 474 475 if ((unsigned)cmd >= PRC_NCMDS) 476 return; 477 if (PRC_IS_REDIRECT(cmd)) { 478 d = NULL; 479 } else if (inet6ctlerrmap[cmd] == 0) { 480 return; 481 } 482 /* if the parameter is from icmp6, decode it. */ 483 if (d != NULL) { 484 ip6cp = (struct ip6ctlparam *)d; 485 } else { 486 ip6cp = (struct ip6ctlparam *)NULL; 487 } 488 489 if (ip6cp) { 490 /* 491 * XXX: We assume that when IPV6 is non NULL, M and OFF are 492 * valid. 493 */ 494 /* check if we can safely examine src and dst ports */ 495 struct sctp_inpcb *inp = NULL; 496 struct sctp_tcb *stcb = NULL; 497 struct sctp_nets *net = NULL; 498 struct sockaddr_in6 final; 499 500 if (ip6cp->ip6c_m == NULL) 501 return; 502 503 bzero(&sh, sizeof(sh)); 504 bzero(&final, sizeof(final)); 505 inp = NULL; 506 net = NULL; 507 m_copydata(ip6cp->ip6c_m, ip6cp->ip6c_off, sizeof(sh), 508 (caddr_t)&sh); 509 ip6cp->ip6c_src->sin6_port = sh.src_port; 510 final.sin6_len = sizeof(final); 511 final.sin6_family = AF_INET6; 512 final.sin6_addr = ((struct sockaddr_in6 *)pktdst)->sin6_addr; 513 final.sin6_port = sh.dest_port; 514 stcb = sctp_findassociation_addr_sa((struct sockaddr *)ip6cp->ip6c_src, 515 (struct sockaddr *)&final, 516 &inp, &net, 1, vrf_id); 517 /* inp's ref-count increased && stcb locked */ 518 if (stcb != NULL && inp && (inp->sctp_socket != NULL)) { 519 if (cmd == PRC_MSGSIZE) { 520 sctp6_notify_mbuf(inp, 521 ip6cp->ip6c_icmp6, 522 &sh, 523 stcb, 524 net); 525 /* inp's ref-count reduced && stcb unlocked */ 526 } else { 527 sctp6_notify(inp, ip6cp->ip6c_icmp6, &sh, 528 (struct sockaddr *)&final, 529 stcb, net); 530 /* inp's ref-count reduced && stcb unlocked */ 531 } 532 } else { 533 if (PRC_IS_REDIRECT(cmd) && inp) { 534 in6_rtchange((struct in6pcb *)inp, 535 inet6ctlerrmap[cmd]); 536 } 537 if (inp) { 538 /* reduce inp's ref-count */ 539 SCTP_INP_WLOCK(inp); 540 SCTP_INP_DECR_REF(inp); 541 SCTP_INP_WUNLOCK(inp); 542 } 543 if (stcb) 544 SCTP_TCB_UNLOCK(stcb); 545 } 546 } 547} 548 549/* 550 * this routine can probably be collasped into the one in sctp_userreq.c 551 * since they do the same thing and now we lookup with a sockaddr 552 */ 553static int 554sctp6_getcred(SYSCTL_HANDLER_ARGS) 555{ 556 struct xucred xuc; 557 struct sockaddr_in6 addrs[2]; 558 struct sctp_inpcb *inp; 559 struct sctp_nets *net; 560 struct sctp_tcb *stcb; 561 int error; 562 uint32_t vrf_id; 563 564 vrf_id = SCTP_DEFAULT_VRFID; 565 566 error = priv_check(req->td, PRIV_NETINET_GETCRED); 567 if (error) 568 return (error); 569 570 if (req->newlen != sizeof(addrs)) { 571 SCTP_LTRACE_ERR_RET(NULL, NULL, NULL, SCTP_FROM_SCTP6_USRREQ, EINVAL); 572 return (EINVAL); 573 } 574 if (req->oldlen != sizeof(struct ucred)) { 575 SCTP_LTRACE_ERR_RET(NULL, NULL, NULL, SCTP_FROM_SCTP6_USRREQ, EINVAL); 576 return (EINVAL); 577 } 578 error = SYSCTL_IN(req, addrs, sizeof(addrs)); 579 if (error) 580 return (error); 581 582 stcb = sctp_findassociation_addr_sa(sin6tosa(&addrs[0]), 583 sin6tosa(&addrs[1]), 584 &inp, &net, 1, vrf_id); 585 if (stcb == NULL || inp == NULL || inp->sctp_socket == NULL) { 586 if ((inp != NULL) && (stcb == NULL)) { 587 /* reduce ref-count */ 588 SCTP_INP_WLOCK(inp); 589 SCTP_INP_DECR_REF(inp); 590 goto cred_can_cont; 591 } 592 SCTP_LTRACE_ERR_RET(inp, NULL, NULL, SCTP_FROM_SCTP6_USRREQ, ENOENT); 593 error = ENOENT; 594 goto out; 595 } 596 SCTP_TCB_UNLOCK(stcb); 597 /* 598 * We use the write lock here, only since in the error leg we need 599 * it. If we used RLOCK, then we would have to 600 * wlock/decr/unlock/rlock. Which in theory could create a hole. 601 * Better to use higher wlock. 602 */ 603 SCTP_INP_WLOCK(inp); 604cred_can_cont: 605 error = cr_canseesocket(req->td->td_ucred, inp->sctp_socket); 606 if (error) { 607 SCTP_INP_WUNLOCK(inp); 608 goto out; 609 } 610 cru2x(inp->sctp_socket->so_cred, &xuc); 611 SCTP_INP_WUNLOCK(inp); 612 error = SYSCTL_OUT(req, &xuc, sizeof(struct xucred)); 613out: 614 return (error); 615} 616 617SYSCTL_PROC(_net_inet6_sctp6, OID_AUTO, getcred, CTLTYPE_OPAQUE | CTLFLAG_RW, 618 0, 0, 619 sctp6_getcred, "S,ucred", "Get the ucred of a SCTP6 connection"); 620 621 622/* This is the same as the sctp_abort() could be made common */ 623static void 624sctp6_abort(struct socket *so) 625{ 626 struct sctp_inpcb *inp; 627 uint32_t flags; 628 629 inp = (struct sctp_inpcb *)so->so_pcb; 630 if (inp == NULL) { 631 SCTP_LTRACE_ERR_RET(inp, NULL, NULL, SCTP_FROM_SCTP6_USRREQ, EINVAL); 632 return; 633 } 634sctp_must_try_again: 635 flags = inp->sctp_flags; 636#ifdef SCTP_LOG_CLOSING 637 sctp_log_closing(inp, NULL, 17); 638#endif 639 if (((flags & SCTP_PCB_FLAGS_SOCKET_GONE) == 0) && 640 (atomic_cmpset_int(&inp->sctp_flags, flags, (flags | SCTP_PCB_FLAGS_SOCKET_GONE | SCTP_PCB_FLAGS_CLOSE_IP)))) { 641#ifdef SCTP_LOG_CLOSING 642 sctp_log_closing(inp, NULL, 16); 643#endif 644 sctp_inpcb_free(inp, SCTP_FREE_SHOULD_USE_ABORT, 645 SCTP_CALLED_AFTER_CMPSET_OFCLOSE); 646 SOCK_LOCK(so); 647 SCTP_SB_CLEAR(so->so_snd); 648 /* 649 * same for the rcv ones, they are only here for the 650 * accounting/select. 651 */ 652 SCTP_SB_CLEAR(so->so_rcv); 653 /* Now null out the reference, we are completely detached. */ 654 so->so_pcb = NULL; 655 SOCK_UNLOCK(so); 656 } else { 657 flags = inp->sctp_flags; 658 if ((flags & SCTP_PCB_FLAGS_SOCKET_GONE) == 0) { 659 goto sctp_must_try_again; 660 } 661 } 662 return; 663} 664 665static int 666sctp6_attach(struct socket *so, int proto SCTP_UNUSED, struct thread *p SCTP_UNUSED) 667{ 668 struct in6pcb *inp6; 669 int error; 670 struct sctp_inpcb *inp; 671 uint32_t vrf_id = SCTP_DEFAULT_VRFID; 672 673 inp = (struct sctp_inpcb *)so->so_pcb; 674 if (inp != NULL) { 675 SCTP_LTRACE_ERR_RET(inp, NULL, NULL, SCTP_FROM_SCTP6_USRREQ, EINVAL); 676 return (EINVAL); 677 } 678 if (so->so_snd.sb_hiwat == 0 || so->so_rcv.sb_hiwat == 0) { 679 error = SCTP_SORESERVE(so, SCTP_BASE_SYSCTL(sctp_sendspace), SCTP_BASE_SYSCTL(sctp_recvspace)); 680 if (error) 681 return (error); 682 } 683 error = sctp_inpcb_alloc(so, vrf_id); 684 if (error) 685 return (error); 686 inp = (struct sctp_inpcb *)so->so_pcb; 687 SCTP_INP_WLOCK(inp); 688 inp->sctp_flags |= SCTP_PCB_FLAGS_BOUND_V6; /* I'm v6! */ 689 inp6 = (struct in6pcb *)inp; 690 691 inp6->inp_vflag |= INP_IPV6; 692 inp6->in6p_hops = -1; /* use kernel default */ 693 inp6->in6p_cksum = -1; /* just to be sure */ 694#ifdef INET 695 /* 696 * XXX: ugly!! IPv4 TTL initialization is necessary for an IPv6 697 * socket as well, because the socket may be bound to an IPv6 698 * wildcard address, which may match an IPv4-mapped IPv6 address. 699 */ 700 inp6->inp_ip_ttl = MODULE_GLOBAL(ip_defttl); 701#endif 702 /* 703 * Hmm what about the IPSEC stuff that is missing here but in 704 * sctp_attach()? 705 */ 706 SCTP_INP_WUNLOCK(inp); 707 return (0); 708} 709 710static int 711sctp6_bind(struct socket *so, struct sockaddr *addr, struct thread *p) 712{ 713 struct sctp_inpcb *inp; 714 struct in6pcb *inp6; 715 int error; 716 717 inp = (struct sctp_inpcb *)so->so_pcb; 718 if (inp == NULL) { 719 SCTP_LTRACE_ERR_RET(inp, NULL, NULL, SCTP_FROM_SCTP6_USRREQ, EINVAL); 720 return (EINVAL); 721 } 722 if (addr) { 723 switch (addr->sa_family) { 724#ifdef INET 725 case AF_INET: 726 if (addr->sa_len != sizeof(struct sockaddr_in)) { 727 SCTP_LTRACE_ERR_RET(inp, NULL, NULL, SCTP_FROM_SCTP6_USRREQ, EINVAL); 728 return (EINVAL); 729 } 730 break; 731#endif 732#ifdef INET6 733 case AF_INET6: 734 if (addr->sa_len != sizeof(struct sockaddr_in6)) { 735 SCTP_LTRACE_ERR_RET(inp, NULL, NULL, SCTP_FROM_SCTP6_USRREQ, EINVAL); 736 return (EINVAL); 737 } 738 break; 739#endif 740 default: 741 SCTP_LTRACE_ERR_RET(inp, NULL, NULL, SCTP_FROM_SCTP6_USRREQ, EINVAL); 742 return (EINVAL); 743 } 744 } 745 inp6 = (struct in6pcb *)inp; 746 inp6->inp_vflag &= ~INP_IPV4; 747 inp6->inp_vflag |= INP_IPV6; 748 if ((addr != NULL) && (SCTP_IPV6_V6ONLY(inp6) == 0)) { 749 switch (addr->sa_family) { 750#ifdef INET 751 case AF_INET: 752 /* binding v4 addr to v6 socket, so reset flags */ 753 inp6->inp_vflag |= INP_IPV4; 754 inp6->inp_vflag &= ~INP_IPV6; 755 break; 756#endif 757#ifdef INET6 758 case AF_INET6: 759 { 760 struct sockaddr_in6 *sin6_p; 761 762 sin6_p = (struct sockaddr_in6 *)addr; 763 764 if (IN6_IS_ADDR_UNSPECIFIED(&sin6_p->sin6_addr)) { 765 inp6->inp_vflag |= INP_IPV4; 766 } 767#ifdef INET 768 if (IN6_IS_ADDR_V4MAPPED(&sin6_p->sin6_addr)) { 769 struct sockaddr_in sin; 770 771 in6_sin6_2_sin(&sin, sin6_p); 772 inp6->inp_vflag |= INP_IPV4; 773 inp6->inp_vflag &= ~INP_IPV6; 774 error = sctp_inpcb_bind(so, (struct sockaddr *)&sin, NULL, p); 775 return (error); 776 } 777#endif 778 break; 779 } 780#endif 781 default: 782 break; 783 } 784 } else if (addr != NULL) { 785 struct sockaddr_in6 *sin6_p; 786 787 /* IPV6_V6ONLY socket */ 788#ifdef INET 789 if (addr->sa_family == AF_INET) { 790 /* can't bind v4 addr to v6 only socket! */ 791 SCTP_LTRACE_ERR_RET(inp, NULL, NULL, SCTP_FROM_SCTP6_USRREQ, EINVAL); 792 return (EINVAL); 793 } 794#endif 795 sin6_p = (struct sockaddr_in6 *)addr; 796 797 if (IN6_IS_ADDR_V4MAPPED(&sin6_p->sin6_addr)) { 798 /* can't bind v4-mapped addrs either! */ 799 /* NOTE: we don't support SIIT */ 800 SCTP_LTRACE_ERR_RET(inp, NULL, NULL, SCTP_FROM_SCTP6_USRREQ, EINVAL); 801 return (EINVAL); 802 } 803 } 804 error = sctp_inpcb_bind(so, addr, NULL, p); 805 return (error); 806} 807 808 809static void 810sctp6_close(struct socket *so) 811{ 812 sctp_close(so); 813} 814 815/* This could be made common with sctp_detach() since they are identical */ 816 817static 818int 819sctp6_disconnect(struct socket *so) 820{ 821 return (sctp_disconnect(so)); 822} 823 824 825int 826sctp_sendm(struct socket *so, int flags, struct mbuf *m, struct sockaddr *addr, 827 struct mbuf *control, struct thread *p); 828 829 830static int 831sctp6_send(struct socket *so, int flags, struct mbuf *m, struct sockaddr *addr, 832 struct mbuf *control, struct thread *p) 833{ 834 struct sctp_inpcb *inp; 835 struct in6pcb *inp6; 836 837#ifdef INET 838 struct sockaddr_in6 *sin6; 839 840#endif /* INET */ 841 /* No SPL needed since sctp_output does this */ 842 843 inp = (struct sctp_inpcb *)so->so_pcb; 844 if (inp == NULL) { 845 if (control) { 846 SCTP_RELEASE_PKT(control); 847 control = NULL; 848 } 849 SCTP_RELEASE_PKT(m); 850 SCTP_LTRACE_ERR_RET(inp, NULL, NULL, SCTP_FROM_SCTP6_USRREQ, EINVAL); 851 return (EINVAL); 852 } 853 inp6 = (struct in6pcb *)inp; 854 /* 855 * For the TCP model we may get a NULL addr, if we are a connected 856 * socket thats ok. 857 */ 858 if ((inp->sctp_flags & SCTP_PCB_FLAGS_CONNECTED) && 859 (addr == NULL)) { 860 goto connected_type; 861 } 862 if (addr == NULL) { 863 SCTP_RELEASE_PKT(m); 864 if (control) { 865 SCTP_RELEASE_PKT(control); 866 control = NULL; 867 } 868 SCTP_LTRACE_ERR_RET(inp, NULL, NULL, SCTP_FROM_SCTP6_USRREQ, EDESTADDRREQ); 869 return (EDESTADDRREQ); 870 } 871#ifdef INET 872 sin6 = (struct sockaddr_in6 *)addr; 873 if (SCTP_IPV6_V6ONLY(inp6)) { 874 /* 875 * if IPV6_V6ONLY flag, we discard datagrams destined to a 876 * v4 addr or v4-mapped addr 877 */ 878 if (addr->sa_family == AF_INET) { 879 SCTP_LTRACE_ERR_RET(inp, NULL, NULL, SCTP_FROM_SCTP6_USRREQ, EINVAL); 880 return (EINVAL); 881 } 882 if (IN6_IS_ADDR_V4MAPPED(&sin6->sin6_addr)) { 883 SCTP_LTRACE_ERR_RET(inp, NULL, NULL, SCTP_FROM_SCTP6_USRREQ, EINVAL); 884 return (EINVAL); 885 } 886 } 887 if (IN6_IS_ADDR_V4MAPPED(&sin6->sin6_addr)) { 888 if (!MODULE_GLOBAL(ip6_v6only)) { 889 struct sockaddr_in sin; 890 891 /* convert v4-mapped into v4 addr and send */ 892 in6_sin6_2_sin(&sin, sin6); 893 return (sctp_sendm(so, flags, m, (struct sockaddr *)&sin, 894 control, p)); 895 } else { 896 /* mapped addresses aren't enabled */ 897 SCTP_LTRACE_ERR_RET(inp, NULL, NULL, SCTP_FROM_SCTP6_USRREQ, EINVAL); 898 return (EINVAL); 899 } 900 } 901#endif /* INET */ 902connected_type: 903 /* now what about control */ 904 if (control) { 905 if (inp->control) { 906 SCTP_PRINTF("huh? control set?\n"); 907 SCTP_RELEASE_PKT(inp->control); 908 inp->control = NULL; 909 } 910 inp->control = control; 911 } 912 /* Place the data */ 913 if (inp->pkt) { 914 SCTP_BUF_NEXT(inp->pkt_last) = m; 915 inp->pkt_last = m; 916 } else { 917 inp->pkt_last = inp->pkt = m; 918 } 919 if ( 920 /* FreeBSD and MacOSX uses a flag passed */ 921 ((flags & PRUS_MORETOCOME) == 0) 922 ) { 923 /* 924 * note with the current version this code will only be used 925 * by OpenBSD, NetBSD and FreeBSD have methods for 926 * re-defining sosend() to use sctp_sosend(). One can 927 * optionaly switch back to this code (by changing back the 928 * defininitions but this is not advisable. 929 */ 930 int ret; 931 932 ret = sctp_output(inp, inp->pkt, addr, inp->control, p, flags); 933 inp->pkt = NULL; 934 inp->control = NULL; 935 return (ret); 936 } else { 937 return (0); 938 } 939} 940 941static int 942sctp6_connect(struct socket *so, struct sockaddr *addr, struct thread *p) 943{ 944 uint32_t vrf_id; 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 955 956 inp6 = (struct in6pcb *)so->so_pcb; 957 inp = (struct sctp_inpcb *)so->so_pcb; 958 if (inp == NULL) { 959 SCTP_LTRACE_ERR_RET(inp, NULL, NULL, SCTP_FROM_SCTP6_USRREQ, ECONNRESET); 960 return (ECONNRESET); /* I made the same as TCP since we are 961 * not setup? */ 962 } 963 if (addr == NULL) { 964 SCTP_LTRACE_ERR_RET(inp, NULL, NULL, SCTP_FROM_SCTP6_USRREQ, EINVAL); 965 return (EINVAL); 966 } 967 switch (addr->sa_family) { 968#ifdef INET 969 case AF_INET: 970 if (addr->sa_len != sizeof(struct sockaddr_in)) { 971 SCTP_LTRACE_ERR_RET(inp, NULL, NULL, SCTP_FROM_SCTP6_USRREQ, EINVAL); 972 return (EINVAL); 973 } 974 break; 975#endif 976#ifdef INET6 977 case AF_INET6: 978 if (addr->sa_len != sizeof(struct sockaddr_in6)) { 979 SCTP_LTRACE_ERR_RET(inp, NULL, NULL, SCTP_FROM_SCTP6_USRREQ, EINVAL); 980 return (EINVAL); 981 } 982 break; 983#endif 984 default: 985 SCTP_LTRACE_ERR_RET(inp, NULL, NULL, SCTP_FROM_SCTP6_USRREQ, EINVAL); 986 return (EINVAL); 987 } 988 989 vrf_id = inp->def_vrf_id; 990 SCTP_ASOC_CREATE_LOCK(inp); 991 SCTP_INP_RLOCK(inp); 992 if ((inp->sctp_flags & SCTP_PCB_FLAGS_UNBOUND) == 993 SCTP_PCB_FLAGS_UNBOUND) { 994 /* Bind a ephemeral port */ 995 SCTP_INP_RUNLOCK(inp); 996 error = sctp6_bind(so, NULL, p); 997 if (error) { 998 SCTP_ASOC_CREATE_UNLOCK(inp); 999 1000 return (error); 1001 } 1002 SCTP_INP_RLOCK(inp); 1003 } 1004 if ((inp->sctp_flags & SCTP_PCB_FLAGS_TCPTYPE) && 1005 (inp->sctp_flags & SCTP_PCB_FLAGS_CONNECTED)) { 1006 /* We are already connected AND the TCP model */ 1007 SCTP_INP_RUNLOCK(inp); 1008 SCTP_ASOC_CREATE_UNLOCK(inp); 1009 SCTP_LTRACE_ERR_RET(inp, NULL, NULL, SCTP_FROM_SCTP6_USRREQ, EADDRINUSE); 1010 return (EADDRINUSE); 1011 } 1012#ifdef INET 1013 sin6 = (struct sockaddr_in6 *)addr; 1014 if (SCTP_IPV6_V6ONLY(inp6)) { 1015 /* 1016 * if IPV6_V6ONLY flag, ignore connections destined to a v4 1017 * addr or v4-mapped addr 1018 */ 1019 if (addr->sa_family == AF_INET) { 1020 SCTP_INP_RUNLOCK(inp); 1021 SCTP_ASOC_CREATE_UNLOCK(inp); 1022 SCTP_LTRACE_ERR_RET(inp, NULL, NULL, SCTP_FROM_SCTP6_USRREQ, EINVAL); 1023 return (EINVAL); 1024 } 1025 if (IN6_IS_ADDR_V4MAPPED(&sin6->sin6_addr)) { 1026 SCTP_INP_RUNLOCK(inp); 1027 SCTP_ASOC_CREATE_UNLOCK(inp); 1028 SCTP_LTRACE_ERR_RET(inp, NULL, NULL, SCTP_FROM_SCTP6_USRREQ, EINVAL); 1029 return (EINVAL); 1030 } 1031 } 1032 if (IN6_IS_ADDR_V4MAPPED(&sin6->sin6_addr)) { 1033 if (!MODULE_GLOBAL(ip6_v6only)) { 1034 /* convert v4-mapped into v4 addr */ 1035 in6_sin6_2_sin((struct sockaddr_in *)&ss, sin6); 1036 addr = (struct sockaddr *)&ss; 1037 } else { 1038 /* mapped addresses aren't enabled */ 1039 SCTP_INP_RUNLOCK(inp); 1040 SCTP_ASOC_CREATE_UNLOCK(inp); 1041 SCTP_LTRACE_ERR_RET(inp, NULL, NULL, SCTP_FROM_SCTP6_USRREQ, EINVAL); 1042 return (EINVAL); 1043 } 1044 } 1045#endif /* INET */ 1046 /* Now do we connect? */ 1047 if (inp->sctp_flags & SCTP_PCB_FLAGS_CONNECTED) { 1048 stcb = LIST_FIRST(&inp->sctp_asoc_list); 1049 if (stcb) { 1050 SCTP_TCB_UNLOCK(stcb); 1051 } 1052 SCTP_INP_RUNLOCK(inp); 1053 } else { 1054 SCTP_INP_RUNLOCK(inp); 1055 SCTP_INP_WLOCK(inp); 1056 SCTP_INP_INCR_REF(inp); 1057 SCTP_INP_WUNLOCK(inp); 1058 stcb = sctp_findassociation_ep_addr(&inp, addr, NULL, NULL, NULL); 1059 if (stcb == NULL) { 1060 SCTP_INP_WLOCK(inp); 1061 SCTP_INP_DECR_REF(inp); 1062 SCTP_INP_WUNLOCK(inp); 1063 } 1064 } 1065 1066 if (stcb != NULL) { 1067 /* Already have or am bring up an association */ 1068 SCTP_ASOC_CREATE_UNLOCK(inp); 1069 SCTP_TCB_UNLOCK(stcb); 1070 SCTP_LTRACE_ERR_RET(inp, NULL, NULL, SCTP_FROM_SCTP6_USRREQ, EALREADY); 1071 return (EALREADY); 1072 } 1073 /* We are GOOD to go */ 1074 stcb = sctp_aloc_assoc(inp, addr, &error, 0, vrf_id, p); 1075 SCTP_ASOC_CREATE_UNLOCK(inp); 1076 if (stcb == NULL) { 1077 /* Gak! no memory */ 1078 return (error); 1079 } 1080 if (stcb->sctp_ep->sctp_flags & SCTP_PCB_FLAGS_TCPTYPE) { 1081 stcb->sctp_ep->sctp_flags |= SCTP_PCB_FLAGS_CONNECTED; 1082 /* Set the connected flag so we can queue data */ 1083 soisconnecting(so); 1084 } 1085 stcb->asoc.state = SCTP_STATE_COOKIE_WAIT; 1086 (void)SCTP_GETTIME_TIMEVAL(&stcb->asoc.time_entered); 1087 1088 /* initialize authentication parameters for the assoc */ 1089 sctp_initialize_auth_params(inp, stcb); 1090 1091 sctp_send_initiate(inp, stcb, SCTP_SO_LOCKED); 1092 SCTP_TCB_UNLOCK(stcb); 1093 return (error); 1094} 1095 1096static int 1097sctp6_getaddr(struct socket *so, struct sockaddr **addr) 1098{ 1099 struct sockaddr_in6 *sin6; 1100 struct sctp_inpcb *inp; 1101 uint32_t vrf_id; 1102 struct sctp_ifa *sctp_ifa; 1103 1104 int error; 1105 1106 /* 1107 * Do the malloc first in case it blocks. 1108 */ 1109 SCTP_MALLOC_SONAME(sin6, struct sockaddr_in6 *, sizeof(*sin6)); 1110 if (sin6 == NULL) 1111 return (ENOMEM); 1112 sin6->sin6_family = AF_INET6; 1113 sin6->sin6_len = sizeof(*sin6); 1114 1115 inp = (struct sctp_inpcb *)so->so_pcb; 1116 if (inp == NULL) { 1117 SCTP_FREE_SONAME(sin6); 1118 SCTP_LTRACE_ERR_RET(inp, NULL, NULL, SCTP_FROM_SCTP6_USRREQ, ECONNRESET); 1119 return (ECONNRESET); 1120 } 1121 SCTP_INP_RLOCK(inp); 1122 sin6->sin6_port = inp->sctp_lport; 1123 if (inp->sctp_flags & SCTP_PCB_FLAGS_BOUNDALL) { 1124 /* For the bound all case you get back 0 */ 1125 if (inp->sctp_flags & SCTP_PCB_FLAGS_CONNECTED) { 1126 struct sctp_tcb *stcb; 1127 struct sockaddr_in6 *sin_a6; 1128 struct sctp_nets *net; 1129 int fnd; 1130 1131 stcb = LIST_FIRST(&inp->sctp_asoc_list); 1132 if (stcb == NULL) { 1133 goto notConn6; 1134 } 1135 fnd = 0; 1136 sin_a6 = NULL; 1137 TAILQ_FOREACH(net, &stcb->asoc.nets, sctp_next) { 1138 sin_a6 = (struct sockaddr_in6 *)&net->ro._l_addr; 1139 if (sin_a6 == NULL) 1140 /* this will make coverity happy */ 1141 continue; 1142 1143 if (sin_a6->sin6_family == AF_INET6) { 1144 fnd = 1; 1145 break; 1146 } 1147 } 1148 if ((!fnd) || (sin_a6 == NULL)) { 1149 /* punt */ 1150 goto notConn6; 1151 } 1152 vrf_id = inp->def_vrf_id; 1153 sctp_ifa = sctp_source_address_selection(inp, stcb, (sctp_route_t *) & net->ro, net, 0, vrf_id); 1154 if (sctp_ifa) { 1155 sin6->sin6_addr = sctp_ifa->address.sin6.sin6_addr; 1156 } 1157 } else { 1158 /* For the bound all case you get back 0 */ 1159 notConn6: 1160 memset(&sin6->sin6_addr, 0, sizeof(sin6->sin6_addr)); 1161 } 1162 } else { 1163 /* Take the first IPv6 address in the list */ 1164 struct sctp_laddr *laddr; 1165 int fnd = 0; 1166 1167 LIST_FOREACH(laddr, &inp->sctp_addr_list, sctp_nxt_addr) { 1168 if (laddr->ifa->address.sa.sa_family == AF_INET6) { 1169 struct sockaddr_in6 *sin_a; 1170 1171 sin_a = (struct sockaddr_in6 *)&laddr->ifa->address.sin6; 1172 sin6->sin6_addr = sin_a->sin6_addr; 1173 fnd = 1; 1174 break; 1175 } 1176 } 1177 if (!fnd) { 1178 SCTP_FREE_SONAME(sin6); 1179 SCTP_INP_RUNLOCK(inp); 1180 SCTP_LTRACE_ERR_RET(inp, NULL, NULL, SCTP_FROM_SCTP6_USRREQ, ENOENT); 1181 return (ENOENT); 1182 } 1183 } 1184 SCTP_INP_RUNLOCK(inp); 1185 /* Scoping things for v6 */ 1186 if ((error = sa6_recoverscope(sin6)) != 0) { 1187 SCTP_FREE_SONAME(sin6); 1188 return (error); 1189 } 1190 (*addr) = (struct sockaddr *)sin6; 1191 return (0); 1192} 1193 1194static int 1195sctp6_peeraddr(struct socket *so, struct sockaddr **addr) 1196{ 1197 struct sockaddr_in6 *sin6; 1198 int fnd; 1199 struct sockaddr_in6 *sin_a6; 1200 struct sctp_inpcb *inp; 1201 struct sctp_tcb *stcb; 1202 struct sctp_nets *net; 1203 int error; 1204 1205 /* Do the malloc first in case it blocks. */ 1206 SCTP_MALLOC_SONAME(sin6, struct sockaddr_in6 *, sizeof *sin6); 1207 if (sin6 == NULL) 1208 return (ENOMEM); 1209 sin6->sin6_family = AF_INET6; 1210 sin6->sin6_len = sizeof(*sin6); 1211 1212 inp = (struct sctp_inpcb *)so->so_pcb; 1213 if ((inp == NULL) || 1214 ((inp->sctp_flags & SCTP_PCB_FLAGS_CONNECTED) == 0)) { 1215 /* UDP type and listeners will drop out here */ 1216 SCTP_FREE_SONAME(sin6); 1217 SCTP_LTRACE_ERR_RET(inp, NULL, NULL, SCTP_FROM_SCTP6_USRREQ, ENOTCONN); 1218 return (ENOTCONN); 1219 } 1220 SCTP_INP_RLOCK(inp); 1221 stcb = LIST_FIRST(&inp->sctp_asoc_list); 1222 if (stcb) { 1223 SCTP_TCB_LOCK(stcb); 1224 } 1225 SCTP_INP_RUNLOCK(inp); 1226 if (stcb == NULL) { 1227 SCTP_FREE_SONAME(sin6); 1228 SCTP_LTRACE_ERR_RET(inp, NULL, NULL, SCTP_FROM_SCTP6_USRREQ, ECONNRESET); 1229 return (ECONNRESET); 1230 } 1231 fnd = 0; 1232 TAILQ_FOREACH(net, &stcb->asoc.nets, sctp_next) { 1233 sin_a6 = (struct sockaddr_in6 *)&net->ro._l_addr; 1234 if (sin_a6->sin6_family == AF_INET6) { 1235 fnd = 1; 1236 sin6->sin6_port = stcb->rport; 1237 sin6->sin6_addr = sin_a6->sin6_addr; 1238 break; 1239 } 1240 } 1241 SCTP_TCB_UNLOCK(stcb); 1242 if (!fnd) { 1243 /* No IPv4 address */ 1244 SCTP_FREE_SONAME(sin6); 1245 SCTP_LTRACE_ERR_RET(inp, NULL, NULL, SCTP_FROM_SCTP6_USRREQ, ENOENT); 1246 return (ENOENT); 1247 } 1248 if ((error = sa6_recoverscope(sin6)) != 0) 1249 return (error); 1250 *addr = (struct sockaddr *)sin6; 1251 return (0); 1252} 1253 1254static int 1255sctp6_in6getaddr(struct socket *so, struct sockaddr **nam) 1256{ 1257#ifdef INET 1258 struct sockaddr *addr; 1259 1260#endif 1261 struct in6pcb *inp6 = sotoin6pcb(so); 1262 int error; 1263 1264 if (inp6 == NULL) { 1265 SCTP_LTRACE_ERR_RET(NULL, NULL, NULL, SCTP_FROM_SCTP6_USRREQ, EINVAL); 1266 return (EINVAL); 1267 } 1268 /* allow v6 addresses precedence */ 1269 error = sctp6_getaddr(so, nam); 1270#ifdef INET 1271 if (error) { 1272 /* try v4 next if v6 failed */ 1273 error = sctp_ingetaddr(so, nam); 1274 if (error) { 1275 return (error); 1276 } 1277 addr = *nam; 1278 /* if I'm V6ONLY, convert it to v4-mapped */ 1279 if (SCTP_IPV6_V6ONLY(inp6)) { 1280 struct sockaddr_in6 sin6; 1281 1282 in6_sin_2_v4mapsin6((struct sockaddr_in *)addr, &sin6); 1283 memcpy(addr, &sin6, sizeof(struct sockaddr_in6)); 1284 } 1285 } 1286#endif 1287 return (error); 1288} 1289 1290 1291static int 1292sctp6_getpeeraddr(struct socket *so, struct sockaddr **nam) 1293{ 1294#ifdef INET 1295 struct sockaddr *addr; 1296 1297#endif 1298 struct in6pcb *inp6 = sotoin6pcb(so); 1299 int error; 1300 1301 if (inp6 == NULL) { 1302 SCTP_LTRACE_ERR_RET(NULL, NULL, NULL, SCTP_FROM_SCTP6_USRREQ, EINVAL); 1303 return (EINVAL); 1304 } 1305 /* allow v6 addresses precedence */ 1306 error = sctp6_peeraddr(so, nam); 1307#ifdef INET 1308 if (error) { 1309 /* try v4 next if v6 failed */ 1310 error = sctp_peeraddr(so, nam); 1311 if (error) { 1312 return (error); 1313 } 1314 addr = *nam; 1315 /* if I'm V6ONLY, convert it to v4-mapped */ 1316 if (SCTP_IPV6_V6ONLY(inp6)) { 1317 struct sockaddr_in6 sin6; 1318 1319 in6_sin_2_v4mapsin6((struct sockaddr_in *)addr, &sin6); 1320 memcpy(addr, &sin6, sizeof(struct sockaddr_in6)); 1321 } 1322 } 1323#endif 1324 return (error); 1325} 1326 1327struct pr_usrreqs sctp6_usrreqs = { 1328 .pru_abort = sctp6_abort, 1329 .pru_accept = sctp_accept, 1330 .pru_attach = sctp6_attach, 1331 .pru_bind = sctp6_bind, 1332 .pru_connect = sctp6_connect, 1333 .pru_control = in6_control, 1334 .pru_close = sctp6_close, 1335 .pru_detach = sctp6_close, 1336 .pru_sopoll = sopoll_generic, 1337 .pru_flush = sctp_flush, 1338 .pru_disconnect = sctp6_disconnect, 1339 .pru_listen = sctp_listen, 1340 .pru_peeraddr = sctp6_getpeeraddr, 1341 .pru_send = sctp6_send, 1342 .pru_shutdown = sctp_shutdown, 1343 .pru_sockaddr = sctp6_in6getaddr, 1344 .pru_sosend = sctp_sosend, 1345 .pru_soreceive = sctp_soreceive 1346}; 1347