sctp6_usrreq.c revision 233005
1/*- 2 * Copyright (c) 2001-2007, by Cisco Systems, Inc. All rights reserved. 3 * Copyright (c) 2008-2011, by Randall Stewart. All rights reserved. 4 * Copyright (c) 2008-2011, 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/* $KAME: sctp6_usrreq.c,v 1.38 2005/08/24 08:08:56 suz Exp $ */ 33 34#include <sys/cdefs.h> 35__FBSDID("$FreeBSD: head/sys/netinet6/sctp6_usrreq.c 233005 2012-03-15 14:22:05Z tuexen $"); 36 37#include <netinet/sctp_os.h> 38#include <sys/proc.h> 39#include <netinet/sctp_pcb.h> 40#include <netinet/sctp_header.h> 41#include <netinet/sctp_var.h> 42#if defined(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#if defined(INET6) 62#include <netipsec/ipsec6.h> 63#endif /* INET6 */ 64#endif /* IPSEC */ 65 66extern struct protosw inetsw[]; 67 68int 69sctp6_input(struct mbuf **i_pak, int *offp, int proto) 70{ 71 struct mbuf *m; 72 struct ip6_hdr *ip6; 73 struct sctphdr *sh; 74 struct sctp_inpcb *in6p = NULL; 75 struct sctp_nets *net; 76 int refcount_up = 0; 77 uint32_t vrf_id = 0; 78 79#ifdef IPSEC 80 struct inpcb *in6p_ip; 81 82#endif 83 struct sctp_chunkhdr *ch; 84 int length, offset, iphlen; 85 uint8_t ecn_bits; 86 struct sctp_tcb *stcb = NULL; 87 int pkt_len = 0; 88 89#if !defined(SCTP_WITH_NO_CSUM) 90 uint32_t check, calc_check; 91 92#endif 93 int off = *offp; 94 uint16_t port = 0; 95 96 /* get the VRF and table id's */ 97 if (SCTP_GET_PKT_VRFID(*i_pak, vrf_id)) { 98 SCTP_RELEASE_PKT(*i_pak); 99 return (-1); 100 } 101 m = SCTP_HEADER_TO_CHAIN(*i_pak); 102 pkt_len = SCTP_HEADER_LEN((*i_pak)); 103 104#ifdef SCTP_PACKET_LOGGING 105 sctp_packet_log(m, pkt_len); 106#endif 107 ip6 = mtod(m, struct ip6_hdr *); 108 /* Ensure that (sctphdr + sctp_chunkhdr) in a row. */ 109 IP6_EXTHDR_GET(sh, struct sctphdr *, m, off, 110 (int)(sizeof(*sh) + sizeof(*ch))); 111 if (sh == NULL) { 112 SCTP_STAT_INCR(sctps_hdrops); 113 return (IPPROTO_DONE); 114 } 115 ch = (struct sctp_chunkhdr *)((caddr_t)sh + sizeof(struct sctphdr)); 116 iphlen = off; 117 offset = iphlen + sizeof(*sh) + sizeof(*ch); 118 SCTPDBG(SCTP_DEBUG_INPUT1, 119 "sctp6_input() length:%d iphlen:%d\n", pkt_len, iphlen); 120 121 122#if defined(NFAITH) && NFAITH > 0 123 124 if (faithprefix_p != NULL && (*faithprefix_p) (&ip6->ip6_dst)) { 125 /* XXX send icmp6 host/port unreach? */ 126 goto bad; 127 } 128#endif /* NFAITH defined and > 0 */ 129 SCTP_STAT_INCR(sctps_recvpackets); 130 SCTP_STAT_INCR_COUNTER64(sctps_inpackets); 131 SCTPDBG(SCTP_DEBUG_INPUT1, "V6 input gets a packet iphlen:%d pktlen:%d\n", 132 iphlen, pkt_len); 133 if (IN6_IS_ADDR_MULTICAST(&ip6->ip6_dst)) { 134 /* No multi-cast support in SCTP */ 135 goto bad; 136 } 137 /* destination port of 0 is illegal, based on RFC2960. */ 138 if (sh->dest_port == 0) 139 goto bad; 140 141 SCTPDBG(SCTP_DEBUG_CRCOFFLOAD, 142 "sctp_input(): Packet of length %d received on %s with csum_flags 0x%x.\n", 143 m->m_pkthdr.len, 144 if_name(m->m_pkthdr.rcvif), 145 m->m_pkthdr.csum_flags); 146#if defined(SCTP_WITH_NO_CSUM) 147 SCTP_STAT_INCR(sctps_recvnocrc); 148#else 149 if (m->m_pkthdr.csum_flags & CSUM_SCTP_VALID) { 150 SCTP_STAT_INCR(sctps_recvhwcrc); 151 goto sctp_skip_csum; 152 } 153 check = sh->checksum; /* save incoming checksum */ 154 if ((check == 0) && (SCTP_BASE_SYSCTL(sctp_no_csum_on_loopback)) && 155 (IN6_ARE_ADDR_EQUAL(&ip6->ip6_src, &ip6->ip6_dst))) { 156 SCTP_STAT_INCR(sctps_recvnocrc); 157 goto sctp_skip_csum; 158 } 159 sh->checksum = 0; /* prepare for calc */ 160 calc_check = sctp_calculate_cksum(m, iphlen); 161 SCTP_STAT_INCR(sctps_recvswcrc); 162 if (calc_check != check) { 163 SCTPDBG(SCTP_DEBUG_INPUT1, "Bad CSUM on SCTP packet calc_check:%x check:%x m:%p phlen:%d\n", 164 calc_check, check, m, iphlen); 165 stcb = sctp_findassociation_addr(m, offset - sizeof(*ch), 166 sh, ch, &in6p, &net, vrf_id); 167 if ((net) && (port)) { 168 if (net->port == 0) { 169 sctp_pathmtu_adjustment(stcb, net->mtu - sizeof(struct udphdr)); 170 } 171 net->port = port; 172 } 173 if ((net != NULL) && (m->m_flags & M_FLOWID)) { 174 net->flowid = m->m_pkthdr.flowid; 175#ifdef INVARIANTS 176 net->flowidset = 1; 177#endif 178 } 179 /* in6p's ref-count increased && stcb locked */ 180 if ((in6p) && (stcb)) { 181 sctp_send_packet_dropped(stcb, net, m, iphlen, 1); 182 sctp_chunk_output((struct sctp_inpcb *)in6p, stcb, SCTP_OUTPUT_FROM_INPUT_ERROR, SCTP_SO_NOT_LOCKED); 183 } else if ((in6p != NULL) && (stcb == NULL)) { 184 refcount_up = 1; 185 } 186 SCTP_STAT_INCR(sctps_badsum); 187 SCTP_STAT_INCR_COUNTER32(sctps_checksumerrors); 188 goto bad; 189 } 190 sh->checksum = calc_check; 191 192sctp_skip_csum: 193#endif 194 net = NULL; 195 /* 196 * Locate pcb and tcb for datagram sctp_findassociation_addr() wants 197 * IP/SCTP/first chunk header... 198 */ 199 stcb = sctp_findassociation_addr(m, offset - sizeof(*ch), 200 sh, ch, &in6p, &net, vrf_id); 201 if ((net) && (port)) { 202 if (net->port == 0) { 203 sctp_pathmtu_adjustment(stcb, net->mtu - sizeof(struct udphdr)); 204 } 205 net->port = port; 206 } 207 if ((net != NULL) && (m->m_flags & M_FLOWID)) { 208 net->flowid = m->m_pkthdr.flowid; 209#ifdef INVARIANTS 210 net->flowidset = 1; 211#endif 212 } 213 /* in6p's ref-count increased */ 214 if (in6p == NULL) { 215 struct sctp_init_chunk *init_chk, chunk_buf; 216 217 SCTP_STAT_INCR(sctps_noport); 218 if (ch->chunk_type == SCTP_INITIATION) { 219 /* 220 * we do a trick here to get the INIT tag, dig in 221 * and get the tag from the INIT and put it in the 222 * common header. 223 */ 224 init_chk = (struct sctp_init_chunk *)sctp_m_getptr(m, 225 iphlen + sizeof(*sh), sizeof(*init_chk), 226 (uint8_t *) & chunk_buf); 227 if (init_chk) 228 sh->v_tag = init_chk->init.initiate_tag; 229 else 230 sh->v_tag = 0; 231 } 232 if (ch->chunk_type == SCTP_SHUTDOWN_ACK) { 233 sctp_send_shutdown_complete2(m, sh, vrf_id, port); 234 goto bad; 235 } 236 if (ch->chunk_type == SCTP_SHUTDOWN_COMPLETE) { 237 goto bad; 238 } 239 if (ch->chunk_type != SCTP_ABORT_ASSOCIATION) { 240 if ((SCTP_BASE_SYSCTL(sctp_blackhole) == 0) || 241 ((SCTP_BASE_SYSCTL(sctp_blackhole) == 1) && 242 (ch->chunk_type != SCTP_INIT))) { 243 sctp_send_abort(m, iphlen, sh, 0, NULL, vrf_id, port); 244 } 245 } 246 goto bad; 247 } else if (stcb == NULL) { 248 refcount_up = 1; 249 } 250#ifdef IPSEC 251 /* 252 * Check AH/ESP integrity. 253 */ 254 in6p_ip = (struct inpcb *)in6p; 255 if (in6p_ip && (ipsec6_in_reject(m, in6p_ip))) { 256/* XXX */ 257 MODULE_GLOBAL(ipsec6stat).in_polvio++; 258 goto bad; 259 } 260#endif /* IPSEC */ 261 262 /* 263 * CONTROL chunk processing 264 */ 265 offset -= sizeof(*ch); 266 ecn_bits = ((ntohl(ip6->ip6_flow) >> 20) & 0x000000ff); 267 268 /* Length now holds the total packet length payload + iphlen */ 269 length = ntohs(ip6->ip6_plen) + iphlen; 270 271 /* sa_ignore NO_NULL_CHK */ 272 sctp_common_input_processing(&m, iphlen, offset, length, sh, ch, 273 in6p, stcb, net, ecn_bits, vrf_id, port); 274 /* inp's ref-count reduced && stcb unlocked */ 275 /* XXX this stuff below gets moved to appropriate parts later... */ 276 if (m) 277 sctp_m_freem(m); 278 if ((in6p) && refcount_up) { 279 /* reduce ref-count */ 280 SCTP_INP_WLOCK(in6p); 281 SCTP_INP_DECR_REF(in6p); 282 SCTP_INP_WUNLOCK(in6p); 283 } 284 return (IPPROTO_DONE); 285 286bad: 287 if (stcb) { 288 SCTP_TCB_UNLOCK(stcb); 289 } 290 if ((in6p) && refcount_up) { 291 /* reduce ref-count */ 292 SCTP_INP_WLOCK(in6p); 293 SCTP_INP_DECR_REF(in6p); 294 SCTP_INP_WUNLOCK(in6p); 295 } 296 if (m) 297 sctp_m_freem(m); 298 return (IPPROTO_DONE); 299} 300 301 302static void 303sctp6_notify_mbuf(struct sctp_inpcb *inp, struct icmp6_hdr *icmp6, 304 struct sctphdr *sh, struct sctp_tcb *stcb, struct sctp_nets *net) 305{ 306 uint32_t nxtsz; 307 308 if ((inp == NULL) || (stcb == NULL) || (net == NULL) || 309 (icmp6 == NULL) || (sh == NULL)) { 310 goto out; 311 } 312 /* First do we even look at it? */ 313 if (ntohl(sh->v_tag) != (stcb->asoc.peer_vtag)) 314 goto out; 315 316 if (icmp6->icmp6_type != ICMP6_PACKET_TOO_BIG) { 317 /* not PACKET TO BIG */ 318 goto out; 319 } 320 /* 321 * ok we need to look closely. We could even get smarter and look at 322 * anyone that we sent to in case we get a different ICMP that tells 323 * us there is no way to reach a host, but for this impl, all we 324 * care about is MTU discovery. 325 */ 326 nxtsz = ntohl(icmp6->icmp6_mtu); 327 /* Stop any PMTU timer */ 328 sctp_timer_stop(SCTP_TIMER_TYPE_PATHMTURAISE, inp, stcb, NULL, SCTP_FROM_SCTP6_USRREQ + SCTP_LOC_1); 329 330 /* Adjust destination size limit */ 331 if (net->mtu > nxtsz) { 332 net->mtu = nxtsz; 333 if (net->port) { 334 net->mtu -= sizeof(struct udphdr); 335 } 336 } 337 /* now what about the ep? */ 338 if (stcb->asoc.smallest_mtu > nxtsz) { 339 struct sctp_tmit_chunk *chk; 340 341 /* Adjust that too */ 342 stcb->asoc.smallest_mtu = nxtsz; 343 /* now off to subtract IP_DF flag if needed */ 344 345 TAILQ_FOREACH(chk, &stcb->asoc.send_queue, sctp_next) { 346 if ((uint32_t) (chk->send_size + IP_HDR_SIZE) > nxtsz) { 347 chk->flags |= CHUNK_FLAGS_FRAGMENT_OK; 348 } 349 } 350 TAILQ_FOREACH(chk, &stcb->asoc.sent_queue, sctp_next) { 351 if ((uint32_t) (chk->send_size + IP_HDR_SIZE) > nxtsz) { 352 /* 353 * For this guy we also mark for immediate 354 * resend since we sent to big of chunk 355 */ 356 chk->flags |= CHUNK_FLAGS_FRAGMENT_OK; 357 if (chk->sent != SCTP_DATAGRAM_RESEND) 358 stcb->asoc.sent_queue_retran_cnt++; 359 chk->sent = SCTP_DATAGRAM_RESEND; 360 chk->rec.data.doing_fast_retransmit = 0; 361 362 chk->sent = SCTP_DATAGRAM_RESEND; 363 /* Clear any time so NO RTT is being done */ 364 chk->sent_rcv_time.tv_sec = 0; 365 chk->sent_rcv_time.tv_usec = 0; 366 stcb->asoc.total_flight -= chk->send_size; 367 net->flight_size -= chk->send_size; 368 } 369 } 370 } 371 sctp_timer_start(SCTP_TIMER_TYPE_PATHMTURAISE, inp, stcb, NULL); 372out: 373 if (stcb) { 374 SCTP_TCB_UNLOCK(stcb); 375 } 376} 377 378 379void 380sctp6_notify(struct sctp_inpcb *inp, 381 struct icmp6_hdr *icmph, 382 struct sctphdr *sh, 383 struct sockaddr *to, 384 struct sctp_tcb *stcb, 385 struct sctp_nets *net) 386{ 387#if defined (__APPLE__) || defined(SCTP_SO_LOCK_TESTING) 388 struct socket *so; 389 390#endif 391 /* protection */ 392 int reason; 393 394 395 if ((inp == NULL) || (stcb == NULL) || (net == NULL) || 396 (sh == NULL) || (to == NULL)) { 397 if (stcb) 398 SCTP_TCB_UNLOCK(stcb); 399 return; 400 } 401 /* First job is to verify the vtag matches what I would send */ 402 if (ntohl(sh->v_tag) != (stcb->asoc.peer_vtag)) { 403 SCTP_TCB_UNLOCK(stcb); 404 return; 405 } 406 if (icmph->icmp6_type != ICMP_UNREACH) { 407 /* We only care about unreachable */ 408 SCTP_TCB_UNLOCK(stcb); 409 return; 410 } 411 if ((icmph->icmp6_code == ICMP_UNREACH_NET) || 412 (icmph->icmp6_code == ICMP_UNREACH_HOST) || 413 (icmph->icmp6_code == ICMP_UNREACH_NET_UNKNOWN) || 414 (icmph->icmp6_code == ICMP_UNREACH_HOST_UNKNOWN) || 415 (icmph->icmp6_code == ICMP_UNREACH_ISOLATED) || 416 (icmph->icmp6_code == ICMP_UNREACH_NET_PROHIB) || 417 (icmph->icmp6_code == ICMP_UNREACH_HOST_PROHIB) || 418 (icmph->icmp6_code == ICMP_UNREACH_FILTER_PROHIB)) { 419 420 /* 421 * Hmm reachablity problems we must examine closely. If its 422 * not reachable, we may have lost a network. Or if there is 423 * NO protocol at the other end named SCTP. well we consider 424 * it a OOTB abort. 425 */ 426 if (net->dest_state & SCTP_ADDR_REACHABLE) { 427 /* Ok that destination is NOT reachable */ 428 net->dest_state &= ~SCTP_ADDR_REACHABLE; 429 net->dest_state &= ~SCTP_ADDR_PF; 430 sctp_ulp_notify(SCTP_NOTIFY_INTERFACE_DOWN, 431 stcb, SCTP_FAILED_THRESHOLD, 432 (void *)net, SCTP_SO_NOT_LOCKED); 433 } 434 SCTP_TCB_UNLOCK(stcb); 435 } else if ((icmph->icmp6_code == ICMP_UNREACH_PROTOCOL) || 436 (icmph->icmp6_code == ICMP_UNREACH_PORT)) { 437 /* 438 * Here the peer is either playing tricks on us, including 439 * an address that belongs to someone who does not support 440 * SCTP OR was a userland implementation that shutdown and 441 * now is dead. In either case treat it like a OOTB abort 442 * with no TCB 443 */ 444 reason = SCTP_PEER_FAULTY; 445 sctp_abort_notification(stcb, reason, SCTP_SO_NOT_LOCKED); 446#if defined (__APPLE__) || defined(SCTP_SO_LOCK_TESTING) 447 so = SCTP_INP_SO(inp); 448 atomic_add_int(&stcb->asoc.refcnt, 1); 449 SCTP_TCB_UNLOCK(stcb); 450 SCTP_SOCKET_LOCK(so, 1); 451 SCTP_TCB_LOCK(stcb); 452 atomic_subtract_int(&stcb->asoc.refcnt, 1); 453#endif 454 (void)sctp_free_assoc(inp, stcb, SCTP_NORMAL_PROC, SCTP_FROM_SCTP_USRREQ + SCTP_LOC_2); 455#if defined (__APPLE__) || defined(SCTP_SO_LOCK_TESTING) 456 SCTP_SOCKET_UNLOCK(so, 1); 457 /* SCTP_TCB_UNLOCK(stcb); MT: I think this is not needed. */ 458#endif 459 /* no need to unlock here, since the TCB is gone */ 460 } else { 461 SCTP_TCB_UNLOCK(stcb); 462 } 463} 464 465 466 467void 468sctp6_ctlinput(int cmd, struct sockaddr *pktdst, void *d) 469{ 470 struct sctphdr sh; 471 struct ip6ctlparam *ip6cp = NULL; 472 uint32_t vrf_id; 473 474 vrf_id = SCTP_DEFAULT_VRFID; 475 476 if (pktdst->sa_family != AF_INET6 || 477 pktdst->sa_len != sizeof(struct sockaddr_in6)) 478 return; 479 480 if ((unsigned)cmd >= PRC_NCMDS) 481 return; 482 if (PRC_IS_REDIRECT(cmd)) { 483 d = NULL; 484 } else if (inet6ctlerrmap[cmd] == 0) { 485 return; 486 } 487 /* if the parameter is from icmp6, decode it. */ 488 if (d != NULL) { 489 ip6cp = (struct ip6ctlparam *)d; 490 } else { 491 ip6cp = (struct ip6ctlparam *)NULL; 492 } 493 494 if (ip6cp) { 495 /* 496 * XXX: We assume that when IPV6 is non NULL, M and OFF are 497 * valid. 498 */ 499 /* check if we can safely examine src and dst ports */ 500 struct sctp_inpcb *inp = NULL; 501 struct sctp_tcb *stcb = NULL; 502 struct sctp_nets *net = NULL; 503 struct sockaddr_in6 final; 504 505 if (ip6cp->ip6c_m == NULL) 506 return; 507 508 bzero(&sh, sizeof(sh)); 509 bzero(&final, sizeof(final)); 510 inp = NULL; 511 net = NULL; 512 m_copydata(ip6cp->ip6c_m, ip6cp->ip6c_off, sizeof(sh), 513 (caddr_t)&sh); 514 ip6cp->ip6c_src->sin6_port = sh.src_port; 515 final.sin6_len = sizeof(final); 516 final.sin6_family = AF_INET6; 517 final.sin6_addr = ((struct sockaddr_in6 *)pktdst)->sin6_addr; 518 final.sin6_port = sh.dest_port; 519 stcb = sctp_findassociation_addr_sa((struct sockaddr *)ip6cp->ip6c_src, 520 (struct sockaddr *)&final, 521 &inp, &net, 1, vrf_id); 522 /* inp's ref-count increased && stcb locked */ 523 if (stcb != NULL && inp && (inp->sctp_socket != NULL)) { 524 if (cmd == PRC_MSGSIZE) { 525 sctp6_notify_mbuf(inp, 526 ip6cp->ip6c_icmp6, 527 &sh, 528 stcb, 529 net); 530 /* inp's ref-count reduced && stcb unlocked */ 531 } else { 532 sctp6_notify(inp, ip6cp->ip6c_icmp6, &sh, 533 (struct sockaddr *)&final, 534 stcb, net); 535 /* inp's ref-count reduced && stcb unlocked */ 536 } 537 } else { 538 if (PRC_IS_REDIRECT(cmd) && inp) { 539 in6_rtchange((struct in6pcb *)inp, 540 inet6ctlerrmap[cmd]); 541 } 542 if (inp) { 543 /* reduce inp's ref-count */ 544 SCTP_INP_WLOCK(inp); 545 SCTP_INP_DECR_REF(inp); 546 SCTP_INP_WUNLOCK(inp); 547 } 548 if (stcb) 549 SCTP_TCB_UNLOCK(stcb); 550 } 551 } 552} 553 554/* 555 * this routine can probably be collasped into the one in sctp_userreq.c 556 * since they do the same thing and now we lookup with a sockaddr 557 */ 558static int 559sctp6_getcred(SYSCTL_HANDLER_ARGS) 560{ 561 struct xucred xuc; 562 struct sockaddr_in6 addrs[2]; 563 struct sctp_inpcb *inp; 564 struct sctp_nets *net; 565 struct sctp_tcb *stcb; 566 int error; 567 uint32_t vrf_id; 568 569 vrf_id = SCTP_DEFAULT_VRFID; 570 571 error = priv_check(req->td, PRIV_NETINET_GETCRED); 572 if (error) 573 return (error); 574 575 if (req->newlen != sizeof(addrs)) { 576 SCTP_LTRACE_ERR_RET(NULL, NULL, NULL, SCTP_FROM_SCTP6_USRREQ, EINVAL); 577 return (EINVAL); 578 } 579 if (req->oldlen != sizeof(struct ucred)) { 580 SCTP_LTRACE_ERR_RET(NULL, NULL, NULL, SCTP_FROM_SCTP6_USRREQ, EINVAL); 581 return (EINVAL); 582 } 583 error = SYSCTL_IN(req, addrs, sizeof(addrs)); 584 if (error) 585 return (error); 586 587 stcb = sctp_findassociation_addr_sa(sin6tosa(&addrs[0]), 588 sin6tosa(&addrs[1]), 589 &inp, &net, 1, vrf_id); 590 if (stcb == NULL || inp == NULL || inp->sctp_socket == NULL) { 591 if ((inp != NULL) && (stcb == NULL)) { 592 /* reduce ref-count */ 593 SCTP_INP_WLOCK(inp); 594 SCTP_INP_DECR_REF(inp); 595 goto cred_can_cont; 596 } 597 SCTP_LTRACE_ERR_RET(inp, NULL, NULL, SCTP_FROM_SCTP6_USRREQ, ENOENT); 598 error = ENOENT; 599 goto out; 600 } 601 SCTP_TCB_UNLOCK(stcb); 602 /* 603 * We use the write lock here, only since in the error leg we need 604 * it. If we used RLOCK, then we would have to 605 * wlock/decr/unlock/rlock. Which in theory could create a hole. 606 * Better to use higher wlock. 607 */ 608 SCTP_INP_WLOCK(inp); 609cred_can_cont: 610 error = cr_canseesocket(req->td->td_ucred, inp->sctp_socket); 611 if (error) { 612 SCTP_INP_WUNLOCK(inp); 613 goto out; 614 } 615 cru2x(inp->sctp_socket->so_cred, &xuc); 616 SCTP_INP_WUNLOCK(inp); 617 error = SYSCTL_OUT(req, &xuc, sizeof(struct xucred)); 618out: 619 return (error); 620} 621 622SYSCTL_PROC(_net_inet6_sctp6, OID_AUTO, getcred, CTLTYPE_OPAQUE | CTLFLAG_RW, 623 0, 0, 624 sctp6_getcred, "S,ucred", "Get the ucred of a SCTP6 connection"); 625 626 627/* This is the same as the sctp_abort() could be made common */ 628static void 629sctp6_abort(struct socket *so) 630{ 631 struct sctp_inpcb *inp; 632 uint32_t flags; 633 634 inp = (struct sctp_inpcb *)so->so_pcb; 635 if (inp == NULL) { 636 SCTP_LTRACE_ERR_RET(inp, NULL, NULL, SCTP_FROM_SCTP6_USRREQ, EINVAL); 637 return; 638 } 639sctp_must_try_again: 640 flags = inp->sctp_flags; 641#ifdef SCTP_LOG_CLOSING 642 sctp_log_closing(inp, NULL, 17); 643#endif 644 if (((flags & SCTP_PCB_FLAGS_SOCKET_GONE) == 0) && 645 (atomic_cmpset_int(&inp->sctp_flags, flags, (flags | SCTP_PCB_FLAGS_SOCKET_GONE | SCTP_PCB_FLAGS_CLOSE_IP)))) { 646#ifdef SCTP_LOG_CLOSING 647 sctp_log_closing(inp, NULL, 16); 648#endif 649 sctp_inpcb_free(inp, SCTP_FREE_SHOULD_USE_ABORT, 650 SCTP_CALLED_AFTER_CMPSET_OFCLOSE); 651 SOCK_LOCK(so); 652 SCTP_SB_CLEAR(so->so_snd); 653 /* 654 * same for the rcv ones, they are only here for the 655 * accounting/select. 656 */ 657 SCTP_SB_CLEAR(so->so_rcv); 658 /* Now null out the reference, we are completely detached. */ 659 so->so_pcb = NULL; 660 SOCK_UNLOCK(so); 661 } else { 662 flags = inp->sctp_flags; 663 if ((flags & SCTP_PCB_FLAGS_SOCKET_GONE) == 0) { 664 goto sctp_must_try_again; 665 } 666 } 667 return; 668} 669 670static int 671sctp6_attach(struct socket *so, int proto SCTP_UNUSED, struct thread *p SCTP_UNUSED) 672{ 673 struct in6pcb *inp6; 674 int error; 675 struct sctp_inpcb *inp; 676 uint32_t vrf_id = SCTP_DEFAULT_VRFID; 677 678 inp = (struct sctp_inpcb *)so->so_pcb; 679 if (inp != NULL) { 680 SCTP_LTRACE_ERR_RET(inp, NULL, NULL, SCTP_FROM_SCTP6_USRREQ, EINVAL); 681 return (EINVAL); 682 } 683 if (so->so_snd.sb_hiwat == 0 || so->so_rcv.sb_hiwat == 0) { 684 error = SCTP_SORESERVE(so, SCTP_BASE_SYSCTL(sctp_sendspace), SCTP_BASE_SYSCTL(sctp_recvspace)); 685 if (error) 686 return (error); 687 } 688 error = sctp_inpcb_alloc(so, vrf_id); 689 if (error) 690 return (error); 691 inp = (struct sctp_inpcb *)so->so_pcb; 692 SCTP_INP_WLOCK(inp); 693 inp->sctp_flags |= SCTP_PCB_FLAGS_BOUND_V6; /* I'm v6! */ 694 inp6 = (struct in6pcb *)inp; 695 696 inp6->inp_vflag |= INP_IPV6; 697 inp6->in6p_hops = -1; /* use kernel default */ 698 inp6->in6p_cksum = -1; /* just to be sure */ 699#ifdef INET 700 /* 701 * XXX: ugly!! IPv4 TTL initialization is necessary for an IPv6 702 * socket as well, because the socket may be bound to an IPv6 703 * wildcard address, which may match an IPv4-mapped IPv6 address. 704 */ 705 inp6->inp_ip_ttl = MODULE_GLOBAL(ip_defttl); 706#endif 707 /* 708 * Hmm what about the IPSEC stuff that is missing here but in 709 * sctp_attach()? 710 */ 711 SCTP_INP_WUNLOCK(inp); 712 return (0); 713} 714 715static int 716sctp6_bind(struct socket *so, struct sockaddr *addr, struct thread *p) 717{ 718 struct sctp_inpcb *inp; 719 struct in6pcb *inp6; 720 int error; 721 722 inp = (struct sctp_inpcb *)so->so_pcb; 723 if (inp == NULL) { 724 SCTP_LTRACE_ERR_RET(inp, NULL, NULL, SCTP_FROM_SCTP6_USRREQ, EINVAL); 725 return (EINVAL); 726 } 727 if (addr) { 728 switch (addr->sa_family) { 729#ifdef INET 730 case AF_INET: 731 if (addr->sa_len != sizeof(struct sockaddr_in)) { 732 SCTP_LTRACE_ERR_RET(inp, NULL, NULL, SCTP_FROM_SCTP6_USRREQ, EINVAL); 733 return (EINVAL); 734 } 735 break; 736#endif 737#ifdef INET6 738 case AF_INET6: 739 if (addr->sa_len != sizeof(struct sockaddr_in6)) { 740 SCTP_LTRACE_ERR_RET(inp, NULL, NULL, SCTP_FROM_SCTP6_USRREQ, EINVAL); 741 return (EINVAL); 742 } 743 break; 744#endif 745 default: 746 SCTP_LTRACE_ERR_RET(inp, NULL, NULL, SCTP_FROM_SCTP6_USRREQ, EINVAL); 747 return (EINVAL); 748 } 749 } 750 inp6 = (struct in6pcb *)inp; 751 inp6->inp_vflag &= ~INP_IPV4; 752 inp6->inp_vflag |= INP_IPV6; 753 if ((addr != NULL) && (SCTP_IPV6_V6ONLY(inp6) == 0)) { 754 switch (addr->sa_family) { 755#ifdef INET 756 case AF_INET: 757 /* binding v4 addr to v6 socket, so reset flags */ 758 inp6->inp_vflag |= INP_IPV4; 759 inp6->inp_vflag &= ~INP_IPV6; 760 break; 761#endif 762#ifdef INET6 763 case AF_INET6: 764 { 765 struct sockaddr_in6 *sin6_p; 766 767 sin6_p = (struct sockaddr_in6 *)addr; 768 769 if (IN6_IS_ADDR_UNSPECIFIED(&sin6_p->sin6_addr)) { 770 inp6->inp_vflag |= INP_IPV4; 771 } 772#ifdef INET 773 if (IN6_IS_ADDR_V4MAPPED(&sin6_p->sin6_addr)) { 774 struct sockaddr_in sin; 775 776 in6_sin6_2_sin(&sin, sin6_p); 777 inp6->inp_vflag |= INP_IPV4; 778 inp6->inp_vflag &= ~INP_IPV6; 779 error = sctp_inpcb_bind(so, (struct sockaddr *)&sin, NULL, p); 780 return (error); 781 } 782#endif 783 break; 784 } 785#endif 786 default: 787 break; 788 } 789 } else if (addr != NULL) { 790 struct sockaddr_in6 *sin6_p; 791 792 /* IPV6_V6ONLY socket */ 793#ifdef INET 794 if (addr->sa_family == AF_INET) { 795 /* can't bind v4 addr to v6 only socket! */ 796 SCTP_LTRACE_ERR_RET(inp, NULL, NULL, SCTP_FROM_SCTP6_USRREQ, EINVAL); 797 return (EINVAL); 798 } 799#endif 800 sin6_p = (struct sockaddr_in6 *)addr; 801 802 if (IN6_IS_ADDR_V4MAPPED(&sin6_p->sin6_addr)) { 803 /* can't bind v4-mapped addrs either! */ 804 /* NOTE: we don't support SIIT */ 805 SCTP_LTRACE_ERR_RET(inp, NULL, NULL, SCTP_FROM_SCTP6_USRREQ, EINVAL); 806 return (EINVAL); 807 } 808 } 809 error = sctp_inpcb_bind(so, addr, NULL, p); 810 return (error); 811} 812 813 814static void 815sctp6_close(struct socket *so) 816{ 817 sctp_close(so); 818} 819 820/* This could be made common with sctp_detach() since they are identical */ 821 822static 823int 824sctp6_disconnect(struct socket *so) 825{ 826 return (sctp_disconnect(so)); 827} 828 829 830int 831sctp_sendm(struct socket *so, int flags, struct mbuf *m, struct sockaddr *addr, 832 struct mbuf *control, struct thread *p); 833 834 835static int 836sctp6_send(struct socket *so, int flags, struct mbuf *m, struct sockaddr *addr, 837 struct mbuf *control, struct thread *p) 838{ 839 struct sctp_inpcb *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 SCTP_RELEASE_PKT(control); 852 control = NULL; 853 } 854 SCTP_RELEASE_PKT(m); 855 SCTP_LTRACE_ERR_RET(inp, NULL, NULL, SCTP_FROM_SCTP6_USRREQ, EINVAL); 856 return (EINVAL); 857 } 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 SCTP_RELEASE_PKT(m); 869 if (control) { 870 SCTP_RELEASE_PKT(control); 871 control = NULL; 872 } 873 SCTP_LTRACE_ERR_RET(inp, NULL, NULL, SCTP_FROM_SCTP6_USRREQ, EDESTADDRREQ); 874 return (EDESTADDRREQ); 875 } 876#ifdef INET 877 sin6 = (struct sockaddr_in6 *)addr; 878 if (SCTP_IPV6_V6ONLY(inp6)) { 879 /* 880 * if IPV6_V6ONLY flag, we discard datagrams destined to a 881 * v4 addr or v4-mapped addr 882 */ 883 if (addr->sa_family == AF_INET) { 884 SCTP_LTRACE_ERR_RET(inp, NULL, NULL, SCTP_FROM_SCTP6_USRREQ, EINVAL); 885 return (EINVAL); 886 } 887 if (IN6_IS_ADDR_V4MAPPED(&sin6->sin6_addr)) { 888 SCTP_LTRACE_ERR_RET(inp, NULL, NULL, SCTP_FROM_SCTP6_USRREQ, EINVAL); 889 return (EINVAL); 890 } 891 } 892 if (IN6_IS_ADDR_V4MAPPED(&sin6->sin6_addr)) { 893 if (!MODULE_GLOBAL(ip6_v6only)) { 894 struct sockaddr_in sin; 895 896 /* convert v4-mapped into v4 addr and send */ 897 in6_sin6_2_sin(&sin, sin6); 898 return (sctp_sendm(so, flags, m, (struct sockaddr *)&sin, 899 control, p)); 900 } else { 901 /* mapped addresses aren't enabled */ 902 SCTP_LTRACE_ERR_RET(inp, NULL, NULL, SCTP_FROM_SCTP6_USRREQ, EINVAL); 903 return (EINVAL); 904 } 905 } 906#endif /* INET */ 907connected_type: 908 /* now what about control */ 909 if (control) { 910 if (inp->control) { 911 SCTP_PRINTF("huh? control set?\n"); 912 SCTP_RELEASE_PKT(inp->control); 913 inp->control = NULL; 914 } 915 inp->control = control; 916 } 917 /* Place the data */ 918 if (inp->pkt) { 919 SCTP_BUF_NEXT(inp->pkt_last) = m; 920 inp->pkt_last = m; 921 } else { 922 inp->pkt_last = inp->pkt = m; 923 } 924 if ( 925 /* FreeBSD and MacOSX uses a flag passed */ 926 ((flags & PRUS_MORETOCOME) == 0) 927 ) { 928 /* 929 * note with the current version this code will only be used 930 * by OpenBSD, NetBSD and FreeBSD have methods for 931 * re-defining sosend() to use sctp_sosend(). One can 932 * optionaly switch back to this code (by changing back the 933 * defininitions but this is not advisable. 934 */ 935 int ret; 936 937 ret = sctp_output(inp, inp->pkt, addr, inp->control, p, flags); 938 inp->pkt = NULL; 939 inp->control = NULL; 940 return (ret); 941 } else { 942 return (0); 943 } 944} 945 946static int 947sctp6_connect(struct socket *so, struct sockaddr *addr, struct thread *p) 948{ 949 uint32_t vrf_id; 950 int error = 0; 951 struct sctp_inpcb *inp; 952 struct in6pcb *inp6; 953 struct sctp_tcb *stcb; 954 955#ifdef INET 956 struct sockaddr_in6 *sin6; 957 struct sockaddr_storage ss; 958 959#endif 960 961 inp6 = (struct in6pcb *)so->so_pcb; 962 inp = (struct sctp_inpcb *)so->so_pcb; 963 if (inp == NULL) { 964 SCTP_LTRACE_ERR_RET(inp, NULL, NULL, SCTP_FROM_SCTP6_USRREQ, ECONNRESET); 965 return (ECONNRESET); /* I made the same as TCP since we are 966 * not setup? */ 967 } 968 if (addr == NULL) { 969 SCTP_LTRACE_ERR_RET(inp, NULL, NULL, SCTP_FROM_SCTP6_USRREQ, EINVAL); 970 return (EINVAL); 971 } 972 switch (addr->sa_family) { 973#ifdef INET 974 case AF_INET: 975 if (addr->sa_len != sizeof(struct sockaddr_in)) { 976 SCTP_LTRACE_ERR_RET(inp, NULL, NULL, SCTP_FROM_SCTP6_USRREQ, EINVAL); 977 return (EINVAL); 978 } 979 break; 980#endif 981#ifdef INET6 982 case AF_INET6: 983 if (addr->sa_len != sizeof(struct sockaddr_in6)) { 984 SCTP_LTRACE_ERR_RET(inp, NULL, NULL, SCTP_FROM_SCTP6_USRREQ, EINVAL); 985 return (EINVAL); 986 } 987 break; 988#endif 989 default: 990 SCTP_LTRACE_ERR_RET(inp, NULL, NULL, SCTP_FROM_SCTP6_USRREQ, EINVAL); 991 return (EINVAL); 992 } 993 994 vrf_id = inp->def_vrf_id; 995 SCTP_ASOC_CREATE_LOCK(inp); 996 SCTP_INP_RLOCK(inp); 997 if ((inp->sctp_flags & SCTP_PCB_FLAGS_UNBOUND) == 998 SCTP_PCB_FLAGS_UNBOUND) { 999 /* Bind a ephemeral port */ 1000 SCTP_INP_RUNLOCK(inp); 1001 error = sctp6_bind(so, NULL, p); 1002 if (error) { 1003 SCTP_ASOC_CREATE_UNLOCK(inp); 1004 1005 return (error); 1006 } 1007 SCTP_INP_RLOCK(inp); 1008 } 1009 if ((inp->sctp_flags & SCTP_PCB_FLAGS_TCPTYPE) && 1010 (inp->sctp_flags & SCTP_PCB_FLAGS_CONNECTED)) { 1011 /* We are already connected AND the TCP model */ 1012 SCTP_INP_RUNLOCK(inp); 1013 SCTP_ASOC_CREATE_UNLOCK(inp); 1014 SCTP_LTRACE_ERR_RET(inp, NULL, NULL, SCTP_FROM_SCTP6_USRREQ, EADDRINUSE); 1015 return (EADDRINUSE); 1016 } 1017#ifdef INET 1018 sin6 = (struct sockaddr_in6 *)addr; 1019 if (SCTP_IPV6_V6ONLY(inp6)) { 1020 /* 1021 * if IPV6_V6ONLY flag, ignore connections destined to a v4 1022 * addr or v4-mapped addr 1023 */ 1024 if (addr->sa_family == AF_INET) { 1025 SCTP_INP_RUNLOCK(inp); 1026 SCTP_ASOC_CREATE_UNLOCK(inp); 1027 SCTP_LTRACE_ERR_RET(inp, NULL, NULL, SCTP_FROM_SCTP6_USRREQ, EINVAL); 1028 return (EINVAL); 1029 } 1030 if (IN6_IS_ADDR_V4MAPPED(&sin6->sin6_addr)) { 1031 SCTP_INP_RUNLOCK(inp); 1032 SCTP_ASOC_CREATE_UNLOCK(inp); 1033 SCTP_LTRACE_ERR_RET(inp, NULL, NULL, SCTP_FROM_SCTP6_USRREQ, EINVAL); 1034 return (EINVAL); 1035 } 1036 } 1037 if (IN6_IS_ADDR_V4MAPPED(&sin6->sin6_addr)) { 1038 if (!MODULE_GLOBAL(ip6_v6only)) { 1039 /* convert v4-mapped into v4 addr */ 1040 in6_sin6_2_sin((struct sockaddr_in *)&ss, sin6); 1041 addr = (struct sockaddr *)&ss; 1042 } else { 1043 /* mapped addresses aren't enabled */ 1044 SCTP_INP_RUNLOCK(inp); 1045 SCTP_ASOC_CREATE_UNLOCK(inp); 1046 SCTP_LTRACE_ERR_RET(inp, NULL, NULL, SCTP_FROM_SCTP6_USRREQ, EINVAL); 1047 return (EINVAL); 1048 } 1049 } 1050#endif /* INET */ 1051 /* Now do we connect? */ 1052 if (inp->sctp_flags & SCTP_PCB_FLAGS_CONNECTED) { 1053 stcb = LIST_FIRST(&inp->sctp_asoc_list); 1054 if (stcb) { 1055 SCTP_TCB_UNLOCK(stcb); 1056 } 1057 SCTP_INP_RUNLOCK(inp); 1058 } else { 1059 SCTP_INP_RUNLOCK(inp); 1060 SCTP_INP_WLOCK(inp); 1061 SCTP_INP_INCR_REF(inp); 1062 SCTP_INP_WUNLOCK(inp); 1063 stcb = sctp_findassociation_ep_addr(&inp, addr, NULL, NULL, NULL); 1064 if (stcb == NULL) { 1065 SCTP_INP_WLOCK(inp); 1066 SCTP_INP_DECR_REF(inp); 1067 SCTP_INP_WUNLOCK(inp); 1068 } 1069 } 1070 1071 if (stcb != NULL) { 1072 /* Already have or am bring up an association */ 1073 SCTP_ASOC_CREATE_UNLOCK(inp); 1074 SCTP_TCB_UNLOCK(stcb); 1075 SCTP_LTRACE_ERR_RET(inp, NULL, NULL, SCTP_FROM_SCTP6_USRREQ, EALREADY); 1076 return (EALREADY); 1077 } 1078 /* We are GOOD to go */ 1079 stcb = sctp_aloc_assoc(inp, addr, &error, 0, vrf_id, p); 1080 SCTP_ASOC_CREATE_UNLOCK(inp); 1081 if (stcb == NULL) { 1082 /* Gak! no memory */ 1083 return (error); 1084 } 1085 if (stcb->sctp_ep->sctp_flags & SCTP_PCB_FLAGS_TCPTYPE) { 1086 stcb->sctp_ep->sctp_flags |= SCTP_PCB_FLAGS_CONNECTED; 1087 /* Set the connected flag so we can queue data */ 1088 soisconnecting(so); 1089 } 1090 stcb->asoc.state = SCTP_STATE_COOKIE_WAIT; 1091 (void)SCTP_GETTIME_TIMEVAL(&stcb->asoc.time_entered); 1092 1093 /* initialize authentication parameters for the assoc */ 1094 sctp_initialize_auth_params(inp, stcb); 1095 1096 sctp_send_initiate(inp, stcb, SCTP_SO_LOCKED); 1097 SCTP_TCB_UNLOCK(stcb); 1098 return (error); 1099} 1100 1101static int 1102sctp6_getaddr(struct socket *so, struct sockaddr **addr) 1103{ 1104 struct sockaddr_in6 *sin6; 1105 struct sctp_inpcb *inp; 1106 uint32_t vrf_id; 1107 struct sctp_ifa *sctp_ifa; 1108 1109 int error; 1110 1111 /* 1112 * Do the malloc first in case it blocks. 1113 */ 1114 SCTP_MALLOC_SONAME(sin6, struct sockaddr_in6 *, sizeof(*sin6)); 1115 if (sin6 == NULL) 1116 return (ENOMEM); 1117 sin6->sin6_family = AF_INET6; 1118 sin6->sin6_len = sizeof(*sin6); 1119 1120 inp = (struct sctp_inpcb *)so->so_pcb; 1121 if (inp == NULL) { 1122 SCTP_FREE_SONAME(sin6); 1123 SCTP_LTRACE_ERR_RET(inp, NULL, NULL, SCTP_FROM_SCTP6_USRREQ, ECONNRESET); 1124 return (ECONNRESET); 1125 } 1126 SCTP_INP_RLOCK(inp); 1127 sin6->sin6_port = inp->sctp_lport; 1128 if (inp->sctp_flags & SCTP_PCB_FLAGS_BOUNDALL) { 1129 /* For the bound all case you get back 0 */ 1130 if (inp->sctp_flags & SCTP_PCB_FLAGS_CONNECTED) { 1131 struct sctp_tcb *stcb; 1132 struct sockaddr_in6 *sin_a6; 1133 struct sctp_nets *net; 1134 int fnd; 1135 1136 stcb = LIST_FIRST(&inp->sctp_asoc_list); 1137 if (stcb == NULL) { 1138 goto notConn6; 1139 } 1140 fnd = 0; 1141 sin_a6 = NULL; 1142 TAILQ_FOREACH(net, &stcb->asoc.nets, sctp_next) { 1143 sin_a6 = (struct sockaddr_in6 *)&net->ro._l_addr; 1144 if (sin_a6 == NULL) 1145 /* this will make coverity happy */ 1146 continue; 1147 1148 if (sin_a6->sin6_family == AF_INET6) { 1149 fnd = 1; 1150 break; 1151 } 1152 } 1153 if ((!fnd) || (sin_a6 == NULL)) { 1154 /* punt */ 1155 goto notConn6; 1156 } 1157 vrf_id = inp->def_vrf_id; 1158 sctp_ifa = sctp_source_address_selection(inp, stcb, (sctp_route_t *) & net->ro, net, 0, vrf_id); 1159 if (sctp_ifa) { 1160 sin6->sin6_addr = sctp_ifa->address.sin6.sin6_addr; 1161 } 1162 } else { 1163 /* For the bound all case you get back 0 */ 1164 notConn6: 1165 memset(&sin6->sin6_addr, 0, sizeof(sin6->sin6_addr)); 1166 } 1167 } else { 1168 /* Take the first IPv6 address in the list */ 1169 struct sctp_laddr *laddr; 1170 int fnd = 0; 1171 1172 LIST_FOREACH(laddr, &inp->sctp_addr_list, sctp_nxt_addr) { 1173 if (laddr->ifa->address.sa.sa_family == AF_INET6) { 1174 struct sockaddr_in6 *sin_a; 1175 1176 sin_a = (struct sockaddr_in6 *)&laddr->ifa->address.sin6; 1177 sin6->sin6_addr = sin_a->sin6_addr; 1178 fnd = 1; 1179 break; 1180 } 1181 } 1182 if (!fnd) { 1183 SCTP_FREE_SONAME(sin6); 1184 SCTP_INP_RUNLOCK(inp); 1185 SCTP_LTRACE_ERR_RET(inp, NULL, NULL, SCTP_FROM_SCTP6_USRREQ, ENOENT); 1186 return (ENOENT); 1187 } 1188 } 1189 SCTP_INP_RUNLOCK(inp); 1190 /* Scoping things for v6 */ 1191 if ((error = sa6_recoverscope(sin6)) != 0) { 1192 SCTP_FREE_SONAME(sin6); 1193 return (error); 1194 } 1195 (*addr) = (struct sockaddr *)sin6; 1196 return (0); 1197} 1198 1199static int 1200sctp6_peeraddr(struct socket *so, struct sockaddr **addr) 1201{ 1202 struct sockaddr_in6 *sin6; 1203 int fnd; 1204 struct sockaddr_in6 *sin_a6; 1205 struct sctp_inpcb *inp; 1206 struct sctp_tcb *stcb; 1207 struct sctp_nets *net; 1208 int error; 1209 1210 /* Do the malloc first in case it blocks. */ 1211 SCTP_MALLOC_SONAME(sin6, struct sockaddr_in6 *, sizeof *sin6); 1212 if (sin6 == NULL) 1213 return (ENOMEM); 1214 sin6->sin6_family = AF_INET6; 1215 sin6->sin6_len = sizeof(*sin6); 1216 1217 inp = (struct sctp_inpcb *)so->so_pcb; 1218 if ((inp == NULL) || 1219 ((inp->sctp_flags & SCTP_PCB_FLAGS_CONNECTED) == 0)) { 1220 /* UDP type and listeners will drop out here */ 1221 SCTP_FREE_SONAME(sin6); 1222 SCTP_LTRACE_ERR_RET(inp, NULL, NULL, SCTP_FROM_SCTP6_USRREQ, ENOTCONN); 1223 return (ENOTCONN); 1224 } 1225 SCTP_INP_RLOCK(inp); 1226 stcb = LIST_FIRST(&inp->sctp_asoc_list); 1227 if (stcb) { 1228 SCTP_TCB_LOCK(stcb); 1229 } 1230 SCTP_INP_RUNLOCK(inp); 1231 if (stcb == NULL) { 1232 SCTP_FREE_SONAME(sin6); 1233 SCTP_LTRACE_ERR_RET(inp, NULL, NULL, SCTP_FROM_SCTP6_USRREQ, ECONNRESET); 1234 return (ECONNRESET); 1235 } 1236 fnd = 0; 1237 TAILQ_FOREACH(net, &stcb->asoc.nets, sctp_next) { 1238 sin_a6 = (struct sockaddr_in6 *)&net->ro._l_addr; 1239 if (sin_a6->sin6_family == AF_INET6) { 1240 fnd = 1; 1241 sin6->sin6_port = stcb->rport; 1242 sin6->sin6_addr = sin_a6->sin6_addr; 1243 break; 1244 } 1245 } 1246 SCTP_TCB_UNLOCK(stcb); 1247 if (!fnd) { 1248 /* No IPv4 address */ 1249 SCTP_FREE_SONAME(sin6); 1250 SCTP_LTRACE_ERR_RET(inp, NULL, NULL, SCTP_FROM_SCTP6_USRREQ, ENOENT); 1251 return (ENOENT); 1252 } 1253 if ((error = sa6_recoverscope(sin6)) != 0) 1254 return (error); 1255 *addr = (struct sockaddr *)sin6; 1256 return (0); 1257} 1258 1259static int 1260sctp6_in6getaddr(struct socket *so, struct sockaddr **nam) 1261{ 1262#ifdef INET 1263 struct sockaddr *addr; 1264 1265#endif 1266 struct in6pcb *inp6 = sotoin6pcb(so); 1267 int error; 1268 1269 if (inp6 == NULL) { 1270 SCTP_LTRACE_ERR_RET(NULL, NULL, NULL, SCTP_FROM_SCTP6_USRREQ, EINVAL); 1271 return (EINVAL); 1272 } 1273 /* allow v6 addresses precedence */ 1274 error = sctp6_getaddr(so, nam); 1275#ifdef INET 1276 if (error) { 1277 /* try v4 next if v6 failed */ 1278 error = sctp_ingetaddr(so, nam); 1279 if (error) { 1280 return (error); 1281 } 1282 addr = *nam; 1283 /* if I'm V6ONLY, convert it to v4-mapped */ 1284 if (SCTP_IPV6_V6ONLY(inp6)) { 1285 struct sockaddr_in6 sin6; 1286 1287 in6_sin_2_v4mapsin6((struct sockaddr_in *)addr, &sin6); 1288 memcpy(addr, &sin6, sizeof(struct sockaddr_in6)); 1289 } 1290 } 1291#endif 1292 return (error); 1293} 1294 1295 1296static int 1297sctp6_getpeeraddr(struct socket *so, struct sockaddr **nam) 1298{ 1299#ifdef INET 1300 struct sockaddr *addr; 1301 1302#endif 1303 struct in6pcb *inp6 = sotoin6pcb(so); 1304 int error; 1305 1306 if (inp6 == NULL) { 1307 SCTP_LTRACE_ERR_RET(NULL, NULL, NULL, SCTP_FROM_SCTP6_USRREQ, EINVAL); 1308 return (EINVAL); 1309 } 1310 /* allow v6 addresses precedence */ 1311 error = sctp6_peeraddr(so, nam); 1312#ifdef INET 1313 if (error) { 1314 /* try v4 next if v6 failed */ 1315 error = sctp_peeraddr(so, nam); 1316 if (error) { 1317 return (error); 1318 } 1319 addr = *nam; 1320 /* if I'm V6ONLY, convert it to v4-mapped */ 1321 if (SCTP_IPV6_V6ONLY(inp6)) { 1322 struct sockaddr_in6 sin6; 1323 1324 in6_sin_2_v4mapsin6((struct sockaddr_in *)addr, &sin6); 1325 memcpy(addr, &sin6, sizeof(struct sockaddr_in6)); 1326 } 1327 } 1328#endif 1329 return (error); 1330} 1331 1332struct pr_usrreqs sctp6_usrreqs = { 1333 .pru_abort = sctp6_abort, 1334 .pru_accept = sctp_accept, 1335 .pru_attach = sctp6_attach, 1336 .pru_bind = sctp6_bind, 1337 .pru_connect = sctp6_connect, 1338 .pru_control = in6_control, 1339 .pru_close = sctp6_close, 1340 .pru_detach = sctp6_close, 1341 .pru_sopoll = sopoll_generic, 1342 .pru_flush = sctp_flush, 1343 .pru_disconnect = sctp6_disconnect, 1344 .pru_listen = sctp_listen, 1345 .pru_peeraddr = sctp6_getpeeraddr, 1346 .pru_send = sctp6_send, 1347 .pru_shutdown = sctp_shutdown, 1348 .pru_sockaddr = sctp6_in6getaddr, 1349 .pru_sosend = sctp_sosend, 1350 .pru_soreceive = sctp_soreceive 1351}; 1352