sctp6_usrreq.c revision 252879
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: stable/9/sys/netinet6/sctp6_usrreq.c 252879 2013-07-06 09:04:55Z tuexen $"); 35 36#include <netinet/sctp_os.h> 37#ifdef INET6 38#include <sys/proc.h> 39#include <netinet/sctp_pcb.h> 40#include <netinet/sctp_header.h> 41#include <netinet/sctp_var.h> 42#ifdef INET6 43#include <netinet6/sctp6_var.h> 44#endif 45#include <netinet/sctp_sysctl.h> 46#include <netinet/sctp_output.h> 47#include <netinet/sctp_uio.h> 48#include <netinet/sctp_asconf.h> 49#include <netinet/sctputil.h> 50#include <netinet/sctp_indata.h> 51#include <netinet/sctp_timer.h> 52#include <netinet/sctp_auth.h> 53#include <netinet/sctp_input.h> 54#include <netinet/sctp_output.h> 55#include <netinet/sctp_bsd_addr.h> 56#include <netinet/sctp_crc32.h> 57#include <netinet/udp.h> 58 59#ifdef IPSEC 60#include <netipsec/ipsec.h> 61#ifdef INET6 62#include <netipsec/ipsec6.h> 63#endif /* INET6 */ 64#endif /* IPSEC */ 65 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 uint32_t mflowid; 89 uint8_t use_mflowid; 90 91#if !defined(SCTP_WITH_NO_CSUM) 92 uint32_t check, calc_check; 93 94#endif 95 int off = *offp; 96 uint16_t port = 0; 97 98 /* get the VRF and table id's */ 99 if (SCTP_GET_PKT_VRFID(*i_pak, vrf_id)) { 100 SCTP_RELEASE_PKT(*i_pak); 101 return (-1); 102 } 103 m = SCTP_HEADER_TO_CHAIN(*i_pak); 104 pkt_len = SCTP_HEADER_LEN(*i_pak); 105 106#ifdef SCTP_PACKET_LOGGING 107 if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_LAST_PACKET_TRACING) { 108 sctp_packet_log(m); 109 } 110#endif 111 if (m->m_flags & M_FLOWID) { 112 mflowid = m->m_pkthdr.flowid; 113 use_mflowid = 1; 114 } else { 115 mflowid = 0; 116 use_mflowid = 0; 117 } 118 ip6 = mtod(m, struct ip6_hdr *); 119 /* Ensure that (sctphdr + sctp_chunkhdr) in a row. */ 120 IP6_EXTHDR_GET(sh, struct sctphdr *, m, off, 121 (int)(sizeof(*sh) + sizeof(*ch))); 122 if (sh == NULL) { 123 SCTP_STAT_INCR(sctps_hdrops); 124 return (IPPROTO_DONE); 125 } 126 ch = (struct sctp_chunkhdr *)((caddr_t)sh + sizeof(struct sctphdr)); 127 iphlen = off; 128 offset = iphlen + sizeof(*sh) + sizeof(*ch); 129 SCTPDBG(SCTP_DEBUG_INPUT1, 130 "sctp6_input() length:%d iphlen:%d\n", pkt_len, iphlen); 131 132 133#if defined(NFAITH) && NFAITH > 0 134 135 if (faithprefix_p != NULL && (*faithprefix_p) (&ip6->ip6_dst)) { 136 /* XXX send icmp6 host/port unreach? */ 137 goto bad; 138 } 139#endif /* NFAITH defined and > 0 */ 140 SCTP_STAT_INCR(sctps_recvpackets); 141 SCTP_STAT_INCR_COUNTER64(sctps_inpackets); 142 SCTPDBG(SCTP_DEBUG_INPUT1, "V6 input gets a packet iphlen:%d pktlen:%d\n", 143 iphlen, pkt_len); 144 if (IN6_IS_ADDR_MULTICAST(&ip6->ip6_dst)) { 145 /* No multi-cast support in SCTP */ 146 goto bad; 147 } 148 /* destination port of 0 is illegal, based on RFC2960. */ 149 if (sh->dest_port == 0) 150 goto bad; 151 152 SCTPDBG(SCTP_DEBUG_CRCOFFLOAD, 153 "sctp_input(): Packet of length %d received on %s with csum_flags 0x%x.\n", 154 m->m_pkthdr.len, 155 if_name(m->m_pkthdr.rcvif), 156 m->m_pkthdr.csum_flags); 157#if defined(SCTP_WITH_NO_CSUM) 158 SCTP_STAT_INCR(sctps_recvnocrc); 159#else 160 if (m->m_pkthdr.csum_flags & CSUM_SCTP_VALID) { 161 SCTP_STAT_INCR(sctps_recvhwcrc); 162 goto sctp_skip_csum; 163 } 164 check = sh->checksum; /* save incoming checksum */ 165 sh->checksum = 0; /* prepare for calc */ 166 calc_check = sctp_calculate_cksum(m, iphlen); 167 SCTP_STAT_INCR(sctps_recvswcrc); 168 if (calc_check != check) { 169 SCTPDBG(SCTP_DEBUG_INPUT1, "Bad CSUM on SCTP packet calc_check:%x check:%x m:%p phlen:%d\n", 170 calc_check, check, m, iphlen); 171 stcb = sctp_findassociation_addr(m, offset - sizeof(*ch), 172 sh, ch, &in6p, &net, vrf_id); 173 if ((net) && (port)) { 174 if (net->port == 0) { 175 sctp_pathmtu_adjustment(stcb, net->mtu - sizeof(struct udphdr)); 176 } 177 net->port = port; 178 } 179 if ((net != NULL) && (use_mflowid != 0)) { 180 net->flowid = mflowid; 181#ifdef INVARIANTS 182 net->flowidset = 1; 183#endif 184 } 185 /* in6p's ref-count increased && stcb locked */ 186 if ((in6p) && (stcb)) { 187 sctp_send_packet_dropped(stcb, net, m, iphlen, 1); 188 sctp_chunk_output((struct sctp_inpcb *)in6p, stcb, SCTP_OUTPUT_FROM_INPUT_ERROR, SCTP_SO_NOT_LOCKED); 189 } else if ((in6p != NULL) && (stcb == NULL)) { 190 refcount_up = 1; 191 } 192 SCTP_STAT_INCR(sctps_badsum); 193 SCTP_STAT_INCR_COUNTER32(sctps_checksumerrors); 194 goto bad; 195 } 196 sh->checksum = calc_check; 197 198sctp_skip_csum: 199#endif 200 net = NULL; 201 /* 202 * Locate pcb and tcb for datagram sctp_findassociation_addr() wants 203 * IP/SCTP/first chunk header... 204 */ 205 stcb = sctp_findassociation_addr(m, offset - sizeof(*ch), 206 sh, ch, &in6p, &net, vrf_id); 207 if ((net) && (port)) { 208 if (net->port == 0) { 209 sctp_pathmtu_adjustment(stcb, net->mtu - sizeof(struct udphdr)); 210 } 211 net->port = port; 212 } 213 if ((net != NULL) && (use_mflowid != 0)) { 214 net->flowid = mflowid; 215#ifdef INVARIANTS 216 net->flowidset = 1; 217#endif 218 } 219 /* in6p's ref-count increased */ 220 if (in6p == NULL) { 221 struct sctp_init_chunk *init_chk, chunk_buf; 222 223 SCTP_STAT_INCR(sctps_noport); 224 if (ch->chunk_type == SCTP_INITIATION) { 225 /* 226 * we do a trick here to get the INIT tag, dig in 227 * and get the tag from the INIT and put it in the 228 * common header. 229 */ 230 init_chk = (struct sctp_init_chunk *)sctp_m_getptr(m, 231 iphlen + sizeof(*sh), sizeof(*init_chk), 232 (uint8_t *) & chunk_buf); 233 if (init_chk) 234 sh->v_tag = init_chk->init.initiate_tag; 235 else 236 sh->v_tag = 0; 237 } 238 if (ch->chunk_type == SCTP_SHUTDOWN_ACK) { 239 sctp_send_shutdown_complete2(m, sh, 240 use_mflowid, mflowid, 241 vrf_id, port); 242 goto bad; 243 } 244 if (ch->chunk_type == SCTP_SHUTDOWN_COMPLETE) { 245 goto bad; 246 } 247 if (ch->chunk_type != SCTP_ABORT_ASSOCIATION) { 248 if ((SCTP_BASE_SYSCTL(sctp_blackhole) == 0) || 249 ((SCTP_BASE_SYSCTL(sctp_blackhole) == 1) && 250 (ch->chunk_type != SCTP_INIT))) { 251 sctp_send_abort(m, iphlen, sh, 0, NULL, 252 use_mflowid, mflowid, 253 vrf_id, port); 254 } 255 } 256 goto bad; 257 } else if (stcb == NULL) { 258 refcount_up = 1; 259 } 260#ifdef IPSEC 261 /* 262 * Check AH/ESP integrity. 263 */ 264 in6p_ip = (struct inpcb *)in6p; 265 if (in6p_ip && (ipsec6_in_reject(m, in6p_ip))) { 266/* XXX */ 267 MODULE_GLOBAL(ipsec6stat).in_polvio++; 268 goto bad; 269 } 270#endif /* IPSEC */ 271 272 /* 273 * CONTROL chunk processing 274 */ 275 offset -= sizeof(*ch); 276 ecn_bits = ((ntohl(ip6->ip6_flow) >> 20) & 0x000000ff); 277 278 /* Length now holds the total packet length payload + iphlen */ 279 length = ntohs(ip6->ip6_plen) + iphlen; 280 281 /* sa_ignore NO_NULL_CHK */ 282 sctp_common_input_processing(&m, iphlen, offset, length, sh, ch, 283 in6p, stcb, net, ecn_bits, 284 use_mflowid, mflowid, 285 vrf_id, port); 286 /* inp's ref-count reduced && stcb unlocked */ 287 /* XXX this stuff below gets moved to appropriate parts later... */ 288 if (m) 289 sctp_m_freem(m); 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 return (IPPROTO_DONE); 297 298bad: 299 if (stcb) { 300 SCTP_TCB_UNLOCK(stcb); 301 } 302 if ((in6p) && refcount_up) { 303 /* reduce ref-count */ 304 SCTP_INP_WLOCK(in6p); 305 SCTP_INP_DECR_REF(in6p); 306 SCTP_INP_WUNLOCK(in6p); 307 } 308 if (m) 309 sctp_m_freem(m); 310 return (IPPROTO_DONE); 311} 312 313 314static void 315sctp6_notify_mbuf(struct sctp_inpcb *inp, struct icmp6_hdr *icmp6, 316 struct sctphdr *sh, struct sctp_tcb *stcb, struct sctp_nets *net) 317{ 318 uint32_t nxtsz; 319 320 if ((inp == NULL) || (stcb == NULL) || (net == NULL) || 321 (icmp6 == NULL) || (sh == NULL)) { 322 goto out; 323 } 324 /* First do we even look at it? */ 325 if (ntohl(sh->v_tag) != (stcb->asoc.peer_vtag)) 326 goto out; 327 328 if (icmp6->icmp6_type != ICMP6_PACKET_TOO_BIG) { 329 /* not PACKET TO BIG */ 330 goto out; 331 } 332 /* 333 * ok we need to look closely. We could even get smarter and look at 334 * anyone that we sent to in case we get a different ICMP that tells 335 * us there is no way to reach a host, but for this impl, all we 336 * care about is MTU discovery. 337 */ 338 nxtsz = ntohl(icmp6->icmp6_mtu); 339 /* Stop any PMTU timer */ 340 sctp_timer_stop(SCTP_TIMER_TYPE_PATHMTURAISE, inp, stcb, NULL, SCTP_FROM_SCTP6_USRREQ + SCTP_LOC_1); 341 342 /* Adjust destination size limit */ 343 if (net->mtu > nxtsz) { 344 net->mtu = nxtsz; 345 if (net->port) { 346 net->mtu -= sizeof(struct udphdr); 347 } 348 } 349 /* now what about the ep? */ 350 if (stcb->asoc.smallest_mtu > nxtsz) { 351 struct sctp_tmit_chunk *chk; 352 353 /* Adjust that too */ 354 stcb->asoc.smallest_mtu = nxtsz; 355 /* now off to subtract IP_DF flag if needed */ 356 357 TAILQ_FOREACH(chk, &stcb->asoc.send_queue, sctp_next) { 358 if ((uint32_t) (chk->send_size + IP_HDR_SIZE) > nxtsz) { 359 chk->flags |= CHUNK_FLAGS_FRAGMENT_OK; 360 } 361 } 362 TAILQ_FOREACH(chk, &stcb->asoc.sent_queue, sctp_next) { 363 if ((uint32_t) (chk->send_size + IP_HDR_SIZE) > nxtsz) { 364 /* 365 * For this guy we also mark for immediate 366 * resend since we sent to big of chunk 367 */ 368 chk->flags |= CHUNK_FLAGS_FRAGMENT_OK; 369 if (chk->sent != SCTP_DATAGRAM_RESEND) 370 stcb->asoc.sent_queue_retran_cnt++; 371 chk->sent = SCTP_DATAGRAM_RESEND; 372 chk->rec.data.doing_fast_retransmit = 0; 373 374 chk->sent = SCTP_DATAGRAM_RESEND; 375 /* Clear any time so NO RTT is being done */ 376 chk->sent_rcv_time.tv_sec = 0; 377 chk->sent_rcv_time.tv_usec = 0; 378 stcb->asoc.total_flight -= chk->send_size; 379 net->flight_size -= chk->send_size; 380 } 381 } 382 } 383 sctp_timer_start(SCTP_TIMER_TYPE_PATHMTURAISE, inp, stcb, NULL); 384out: 385 if (stcb) { 386 SCTP_TCB_UNLOCK(stcb); 387 } 388} 389 390 391void 392sctp6_notify(struct sctp_inpcb *inp, 393 struct icmp6_hdr *icmph, 394 struct sctphdr *sh, 395 struct sockaddr *to, 396 struct sctp_tcb *stcb, 397 struct sctp_nets *net) 398{ 399#if defined (__APPLE__) || defined(SCTP_SO_LOCK_TESTING) 400 struct socket *so; 401 402#endif 403 404 /* protection */ 405 if ((inp == NULL) || (stcb == NULL) || (net == NULL) || 406 (sh == NULL) || (to == NULL)) { 407 if (stcb) 408 SCTP_TCB_UNLOCK(stcb); 409 return; 410 } 411 /* First job is to verify the vtag matches what I would send */ 412 if (ntohl(sh->v_tag) != (stcb->asoc.peer_vtag)) { 413 SCTP_TCB_UNLOCK(stcb); 414 return; 415 } 416 if (icmph->icmp6_type != ICMP_UNREACH) { 417 /* We only care about unreachable */ 418 SCTP_TCB_UNLOCK(stcb); 419 return; 420 } 421 if ((icmph->icmp6_code == ICMP_UNREACH_NET) || 422 (icmph->icmp6_code == ICMP_UNREACH_HOST) || 423 (icmph->icmp6_code == ICMP_UNREACH_NET_UNKNOWN) || 424 (icmph->icmp6_code == ICMP_UNREACH_HOST_UNKNOWN) || 425 (icmph->icmp6_code == ICMP_UNREACH_ISOLATED) || 426 (icmph->icmp6_code == ICMP_UNREACH_NET_PROHIB) || 427 (icmph->icmp6_code == ICMP_UNREACH_HOST_PROHIB) || 428 (icmph->icmp6_code == ICMP_UNREACH_FILTER_PROHIB)) { 429 430 /* 431 * Hmm reachablity problems we must examine closely. If its 432 * not reachable, we may have lost a network. Or if there is 433 * NO protocol at the other end named SCTP. well we consider 434 * it a OOTB abort. 435 */ 436 if (net->dest_state & SCTP_ADDR_REACHABLE) { 437 /* Ok that destination is NOT reachable */ 438 net->dest_state &= ~SCTP_ADDR_REACHABLE; 439 net->dest_state &= ~SCTP_ADDR_PF; 440 sctp_ulp_notify(SCTP_NOTIFY_INTERFACE_DOWN, 441 stcb, 0, (void *)net, SCTP_SO_NOT_LOCKED); 442 } 443 SCTP_TCB_UNLOCK(stcb); 444 } else if ((icmph->icmp6_code == ICMP_UNREACH_PROTOCOL) || 445 (icmph->icmp6_code == ICMP_UNREACH_PORT)) { 446 /* 447 * Here the peer is either playing tricks on us, including 448 * an address that belongs to someone who does not support 449 * SCTP OR was a userland implementation that shutdown and 450 * now is dead. In either case treat it like a OOTB abort 451 * with no TCB 452 */ 453 sctp_abort_notification(stcb, 1, 0, NULL, SCTP_SO_NOT_LOCKED); 454#if defined (__APPLE__) || defined(SCTP_SO_LOCK_TESTING) 455 so = SCTP_INP_SO(inp); 456 atomic_add_int(&stcb->asoc.refcnt, 1); 457 SCTP_TCB_UNLOCK(stcb); 458 SCTP_SOCKET_LOCK(so, 1); 459 SCTP_TCB_LOCK(stcb); 460 atomic_subtract_int(&stcb->asoc.refcnt, 1); 461#endif 462 (void)sctp_free_assoc(inp, stcb, SCTP_NORMAL_PROC, SCTP_FROM_SCTP_USRREQ + SCTP_LOC_2); 463#if defined (__APPLE__) || defined(SCTP_SO_LOCK_TESTING) 464 SCTP_SOCKET_UNLOCK(so, 1); 465 /* SCTP_TCB_UNLOCK(stcb); MT: I think this is not needed. */ 466#endif 467 /* no need to unlock here, since the TCB is gone */ 468 } else { 469 SCTP_TCB_UNLOCK(stcb); 470 } 471} 472 473 474 475void 476sctp6_ctlinput(int cmd, struct sockaddr *pktdst, void *d) 477{ 478 struct sctphdr sh; 479 struct ip6ctlparam *ip6cp = NULL; 480 uint32_t vrf_id; 481 482 vrf_id = SCTP_DEFAULT_VRFID; 483 484 if (pktdst->sa_family != AF_INET6 || 485 pktdst->sa_len != sizeof(struct sockaddr_in6)) 486 return; 487 488 if ((unsigned)cmd >= PRC_NCMDS) 489 return; 490 if (PRC_IS_REDIRECT(cmd)) { 491 d = NULL; 492 } else if (inet6ctlerrmap[cmd] == 0) { 493 return; 494 } 495 /* if the parameter is from icmp6, decode it. */ 496 if (d != NULL) { 497 ip6cp = (struct ip6ctlparam *)d; 498 } else { 499 ip6cp = (struct ip6ctlparam *)NULL; 500 } 501 502 if (ip6cp) { 503 /* 504 * XXX: We assume that when IPV6 is non NULL, M and OFF are 505 * valid. 506 */ 507 /* check if we can safely examine src and dst ports */ 508 struct sctp_inpcb *inp = NULL; 509 struct sctp_tcb *stcb = NULL; 510 struct sctp_nets *net = NULL; 511 struct sockaddr_in6 final; 512 513 if (ip6cp->ip6c_m == NULL) 514 return; 515 516 bzero(&sh, sizeof(sh)); 517 bzero(&final, sizeof(final)); 518 inp = NULL; 519 net = NULL; 520 m_copydata(ip6cp->ip6c_m, ip6cp->ip6c_off, sizeof(sh), 521 (caddr_t)&sh); 522 ip6cp->ip6c_src->sin6_port = sh.src_port; 523 final.sin6_len = sizeof(final); 524 final.sin6_family = AF_INET6; 525 final.sin6_addr = ((struct sockaddr_in6 *)pktdst)->sin6_addr; 526 final.sin6_port = sh.dest_port; 527 stcb = sctp_findassociation_addr_sa((struct sockaddr *)ip6cp->ip6c_src, 528 (struct sockaddr *)&final, 529 &inp, &net, 1, vrf_id); 530 /* inp's ref-count increased && stcb locked */ 531 if (stcb != NULL && inp && (inp->sctp_socket != NULL)) { 532 if (cmd == PRC_MSGSIZE) { 533 sctp6_notify_mbuf(inp, 534 ip6cp->ip6c_icmp6, 535 &sh, 536 stcb, 537 net); 538 /* inp's ref-count reduced && stcb unlocked */ 539 } else { 540 sctp6_notify(inp, ip6cp->ip6c_icmp6, &sh, 541 (struct sockaddr *)&final, 542 stcb, net); 543 /* inp's ref-count reduced && stcb unlocked */ 544 } 545 } else { 546 if (PRC_IS_REDIRECT(cmd) && inp) { 547 in6_rtchange((struct in6pcb *)inp, 548 inet6ctlerrmap[cmd]); 549 } 550 if (inp) { 551 /* reduce inp's ref-count */ 552 SCTP_INP_WLOCK(inp); 553 SCTP_INP_DECR_REF(inp); 554 SCTP_INP_WUNLOCK(inp); 555 } 556 if (stcb) 557 SCTP_TCB_UNLOCK(stcb); 558 } 559 } 560} 561 562/* 563 * this routine can probably be collasped into the one in sctp_userreq.c 564 * since they do the same thing and now we lookup with a sockaddr 565 */ 566static int 567sctp6_getcred(SYSCTL_HANDLER_ARGS) 568{ 569 struct xucred xuc; 570 struct sockaddr_in6 addrs[2]; 571 struct sctp_inpcb *inp; 572 struct sctp_nets *net; 573 struct sctp_tcb *stcb; 574 int error; 575 uint32_t vrf_id; 576 577 vrf_id = SCTP_DEFAULT_VRFID; 578 579 error = priv_check(req->td, PRIV_NETINET_GETCRED); 580 if (error) 581 return (error); 582 583 if (req->newlen != sizeof(addrs)) { 584 SCTP_LTRACE_ERR_RET(NULL, NULL, NULL, SCTP_FROM_SCTP6_USRREQ, EINVAL); 585 return (EINVAL); 586 } 587 if (req->oldlen != sizeof(struct ucred)) { 588 SCTP_LTRACE_ERR_RET(NULL, NULL, NULL, SCTP_FROM_SCTP6_USRREQ, EINVAL); 589 return (EINVAL); 590 } 591 error = SYSCTL_IN(req, addrs, sizeof(addrs)); 592 if (error) 593 return (error); 594 595 stcb = sctp_findassociation_addr_sa(sin6tosa(&addrs[0]), 596 sin6tosa(&addrs[1]), 597 &inp, &net, 1, vrf_id); 598 if (stcb == NULL || inp == NULL || inp->sctp_socket == NULL) { 599 if ((inp != NULL) && (stcb == NULL)) { 600 /* reduce ref-count */ 601 SCTP_INP_WLOCK(inp); 602 SCTP_INP_DECR_REF(inp); 603 goto cred_can_cont; 604 } 605 SCTP_LTRACE_ERR_RET(inp, NULL, NULL, SCTP_FROM_SCTP6_USRREQ, ENOENT); 606 error = ENOENT; 607 goto out; 608 } 609 SCTP_TCB_UNLOCK(stcb); 610 /* 611 * We use the write lock here, only since in the error leg we need 612 * it. If we used RLOCK, then we would have to 613 * wlock/decr/unlock/rlock. Which in theory could create a hole. 614 * Better to use higher wlock. 615 */ 616 SCTP_INP_WLOCK(inp); 617cred_can_cont: 618 error = cr_canseesocket(req->td->td_ucred, inp->sctp_socket); 619 if (error) { 620 SCTP_INP_WUNLOCK(inp); 621 goto out; 622 } 623 cru2x(inp->sctp_socket->so_cred, &xuc); 624 SCTP_INP_WUNLOCK(inp); 625 error = SYSCTL_OUT(req, &xuc, sizeof(struct xucred)); 626out: 627 return (error); 628} 629 630SYSCTL_PROC(_net_inet6_sctp6, OID_AUTO, getcred, CTLTYPE_OPAQUE | CTLFLAG_RW, 631 0, 0, 632 sctp6_getcred, "S,ucred", "Get the ucred of a SCTP6 connection"); 633 634 635/* This is the same as the sctp_abort() could be made common */ 636static void 637sctp6_abort(struct socket *so) 638{ 639 struct sctp_inpcb *inp; 640 uint32_t flags; 641 642 inp = (struct sctp_inpcb *)so->so_pcb; 643 if (inp == NULL) { 644 SCTP_LTRACE_ERR_RET(inp, NULL, NULL, SCTP_FROM_SCTP6_USRREQ, EINVAL); 645 return; 646 } 647sctp_must_try_again: 648 flags = inp->sctp_flags; 649#ifdef SCTP_LOG_CLOSING 650 sctp_log_closing(inp, NULL, 17); 651#endif 652 if (((flags & SCTP_PCB_FLAGS_SOCKET_GONE) == 0) && 653 (atomic_cmpset_int(&inp->sctp_flags, flags, (flags | SCTP_PCB_FLAGS_SOCKET_GONE | SCTP_PCB_FLAGS_CLOSE_IP)))) { 654#ifdef SCTP_LOG_CLOSING 655 sctp_log_closing(inp, NULL, 16); 656#endif 657 sctp_inpcb_free(inp, SCTP_FREE_SHOULD_USE_ABORT, 658 SCTP_CALLED_AFTER_CMPSET_OFCLOSE); 659 SOCK_LOCK(so); 660 SCTP_SB_CLEAR(so->so_snd); 661 /* 662 * same for the rcv ones, they are only here for the 663 * accounting/select. 664 */ 665 SCTP_SB_CLEAR(so->so_rcv); 666 /* Now null out the reference, we are completely detached. */ 667 so->so_pcb = NULL; 668 SOCK_UNLOCK(so); 669 } else { 670 flags = inp->sctp_flags; 671 if ((flags & SCTP_PCB_FLAGS_SOCKET_GONE) == 0) { 672 goto sctp_must_try_again; 673 } 674 } 675 return; 676} 677 678static int 679sctp6_attach(struct socket *so, int proto SCTP_UNUSED, struct thread *p SCTP_UNUSED) 680{ 681 struct in6pcb *inp6; 682 int error; 683 struct sctp_inpcb *inp; 684 uint32_t vrf_id = SCTP_DEFAULT_VRFID; 685 686 inp = (struct sctp_inpcb *)so->so_pcb; 687 if (inp != NULL) { 688 SCTP_LTRACE_ERR_RET(inp, NULL, NULL, SCTP_FROM_SCTP6_USRREQ, EINVAL); 689 return (EINVAL); 690 } 691 if (so->so_snd.sb_hiwat == 0 || so->so_rcv.sb_hiwat == 0) { 692 error = SCTP_SORESERVE(so, SCTP_BASE_SYSCTL(sctp_sendspace), SCTP_BASE_SYSCTL(sctp_recvspace)); 693 if (error) 694 return (error); 695 } 696 error = sctp_inpcb_alloc(so, vrf_id); 697 if (error) 698 return (error); 699 inp = (struct sctp_inpcb *)so->so_pcb; 700 SCTP_INP_WLOCK(inp); 701 inp->sctp_flags |= SCTP_PCB_FLAGS_BOUND_V6; /* I'm v6! */ 702 inp6 = (struct in6pcb *)inp; 703 704 inp6->inp_vflag |= INP_IPV6; 705 inp6->in6p_hops = -1; /* use kernel default */ 706 inp6->in6p_cksum = -1; /* just to be sure */ 707#ifdef INET 708 /* 709 * XXX: ugly!! IPv4 TTL initialization is necessary for an IPv6 710 * socket as well, because the socket may be bound to an IPv6 711 * wildcard address, which may match an IPv4-mapped IPv6 address. 712 */ 713 inp6->inp_ip_ttl = MODULE_GLOBAL(ip_defttl); 714#endif 715 /* 716 * Hmm what about the IPSEC stuff that is missing here but in 717 * sctp_attach()? 718 */ 719 SCTP_INP_WUNLOCK(inp); 720 return (0); 721} 722 723static int 724sctp6_bind(struct socket *so, struct sockaddr *addr, struct thread *p) 725{ 726 struct sctp_inpcb *inp; 727 struct in6pcb *inp6; 728 int error; 729 730 inp = (struct sctp_inpcb *)so->so_pcb; 731 if (inp == NULL) { 732 SCTP_LTRACE_ERR_RET(inp, NULL, NULL, SCTP_FROM_SCTP6_USRREQ, EINVAL); 733 return (EINVAL); 734 } 735 if (addr) { 736 switch (addr->sa_family) { 737#ifdef INET 738 case AF_INET: 739 if (addr->sa_len != sizeof(struct sockaddr_in)) { 740 SCTP_LTRACE_ERR_RET(inp, NULL, NULL, SCTP_FROM_SCTP6_USRREQ, EINVAL); 741 return (EINVAL); 742 } 743 break; 744#endif 745#ifdef INET6 746 case AF_INET6: 747 if (addr->sa_len != sizeof(struct sockaddr_in6)) { 748 SCTP_LTRACE_ERR_RET(inp, NULL, NULL, SCTP_FROM_SCTP6_USRREQ, EINVAL); 749 return (EINVAL); 750 } 751 break; 752#endif 753 default: 754 SCTP_LTRACE_ERR_RET(inp, NULL, NULL, SCTP_FROM_SCTP6_USRREQ, EINVAL); 755 return (EINVAL); 756 } 757 } 758 inp6 = (struct in6pcb *)inp; 759 inp6->inp_vflag &= ~INP_IPV4; 760 inp6->inp_vflag |= INP_IPV6; 761 if ((addr != NULL) && (SCTP_IPV6_V6ONLY(inp6) == 0)) { 762 switch (addr->sa_family) { 763#ifdef INET 764 case AF_INET: 765 /* binding v4 addr to v6 socket, so reset flags */ 766 inp6->inp_vflag |= INP_IPV4; 767 inp6->inp_vflag &= ~INP_IPV6; 768 break; 769#endif 770#ifdef INET6 771 case AF_INET6: 772 { 773 struct sockaddr_in6 *sin6_p; 774 775 sin6_p = (struct sockaddr_in6 *)addr; 776 777 if (IN6_IS_ADDR_UNSPECIFIED(&sin6_p->sin6_addr)) { 778 inp6->inp_vflag |= INP_IPV4; 779 } 780#ifdef INET 781 if (IN6_IS_ADDR_V4MAPPED(&sin6_p->sin6_addr)) { 782 struct sockaddr_in sin; 783 784 in6_sin6_2_sin(&sin, sin6_p); 785 inp6->inp_vflag |= INP_IPV4; 786 inp6->inp_vflag &= ~INP_IPV6; 787 error = sctp_inpcb_bind(so, (struct sockaddr *)&sin, NULL, p); 788 return (error); 789 } 790#endif 791 break; 792 } 793#endif 794 default: 795 break; 796 } 797 } else if (addr != NULL) { 798 struct sockaddr_in6 *sin6_p; 799 800 /* IPV6_V6ONLY socket */ 801#ifdef INET 802 if (addr->sa_family == AF_INET) { 803 /* can't bind v4 addr to v6 only socket! */ 804 SCTP_LTRACE_ERR_RET(inp, NULL, NULL, SCTP_FROM_SCTP6_USRREQ, EINVAL); 805 return (EINVAL); 806 } 807#endif 808 sin6_p = (struct sockaddr_in6 *)addr; 809 810 if (IN6_IS_ADDR_V4MAPPED(&sin6_p->sin6_addr)) { 811 /* can't bind v4-mapped addrs either! */ 812 /* NOTE: we don't support SIIT */ 813 SCTP_LTRACE_ERR_RET(inp, NULL, NULL, SCTP_FROM_SCTP6_USRREQ, EINVAL); 814 return (EINVAL); 815 } 816 } 817 error = sctp_inpcb_bind(so, addr, NULL, p); 818 return (error); 819} 820 821 822static void 823sctp6_close(struct socket *so) 824{ 825 sctp_close(so); 826} 827 828/* This could be made common with sctp_detach() since they are identical */ 829 830static 831int 832sctp6_disconnect(struct socket *so) 833{ 834 return (sctp_disconnect(so)); 835} 836 837 838int 839sctp_sendm(struct socket *so, int flags, struct mbuf *m, struct sockaddr *addr, 840 struct mbuf *control, struct thread *p); 841 842 843static int 844sctp6_send(struct socket *so, int flags, struct mbuf *m, struct sockaddr *addr, 845 struct mbuf *control, struct thread *p) 846{ 847 struct sctp_inpcb *inp; 848 struct in6pcb *inp6; 849 850#ifdef INET 851 struct sockaddr_in6 *sin6; 852 853#endif /* INET */ 854 /* No SPL needed since sctp_output does this */ 855 856 inp = (struct sctp_inpcb *)so->so_pcb; 857 if (inp == NULL) { 858 if (control) { 859 SCTP_RELEASE_PKT(control); 860 control = NULL; 861 } 862 SCTP_RELEASE_PKT(m); 863 SCTP_LTRACE_ERR_RET(inp, NULL, NULL, SCTP_FROM_SCTP6_USRREQ, EINVAL); 864 return (EINVAL); 865 } 866 inp6 = (struct in6pcb *)inp; 867 /* 868 * For the TCP model we may get a NULL addr, if we are a connected 869 * socket thats ok. 870 */ 871 if ((inp->sctp_flags & SCTP_PCB_FLAGS_CONNECTED) && 872 (addr == NULL)) { 873 goto connected_type; 874 } 875 if (addr == NULL) { 876 SCTP_RELEASE_PKT(m); 877 if (control) { 878 SCTP_RELEASE_PKT(control); 879 control = NULL; 880 } 881 SCTP_LTRACE_ERR_RET(inp, NULL, NULL, SCTP_FROM_SCTP6_USRREQ, EDESTADDRREQ); 882 return (EDESTADDRREQ); 883 } 884#ifdef INET 885 sin6 = (struct sockaddr_in6 *)addr; 886 if (SCTP_IPV6_V6ONLY(inp6)) { 887 /* 888 * if IPV6_V6ONLY flag, we discard datagrams destined to a 889 * v4 addr or v4-mapped addr 890 */ 891 if (addr->sa_family == AF_INET) { 892 SCTP_LTRACE_ERR_RET(inp, NULL, NULL, SCTP_FROM_SCTP6_USRREQ, EINVAL); 893 return (EINVAL); 894 } 895 if (IN6_IS_ADDR_V4MAPPED(&sin6->sin6_addr)) { 896 SCTP_LTRACE_ERR_RET(inp, NULL, NULL, SCTP_FROM_SCTP6_USRREQ, EINVAL); 897 return (EINVAL); 898 } 899 } 900 if (IN6_IS_ADDR_V4MAPPED(&sin6->sin6_addr)) { 901 if (!MODULE_GLOBAL(ip6_v6only)) { 902 struct sockaddr_in sin; 903 904 /* convert v4-mapped into v4 addr and send */ 905 in6_sin6_2_sin(&sin, sin6); 906 return (sctp_sendm(so, flags, m, (struct sockaddr *)&sin, 907 control, p)); 908 } else { 909 /* mapped addresses aren't enabled */ 910 SCTP_LTRACE_ERR_RET(inp, NULL, NULL, SCTP_FROM_SCTP6_USRREQ, EINVAL); 911 return (EINVAL); 912 } 913 } 914#endif /* INET */ 915connected_type: 916 /* now what about control */ 917 if (control) { 918 if (inp->control) { 919 SCTP_PRINTF("huh? control set?\n"); 920 SCTP_RELEASE_PKT(inp->control); 921 inp->control = NULL; 922 } 923 inp->control = control; 924 } 925 /* Place the data */ 926 if (inp->pkt) { 927 SCTP_BUF_NEXT(inp->pkt_last) = m; 928 inp->pkt_last = m; 929 } else { 930 inp->pkt_last = inp->pkt = m; 931 } 932 if ( 933 /* FreeBSD and MacOSX uses a flag passed */ 934 ((flags & PRUS_MORETOCOME) == 0) 935 ) { 936 /* 937 * note with the current version this code will only be used 938 * by OpenBSD, NetBSD and FreeBSD have methods for 939 * re-defining sosend() to use sctp_sosend(). One can 940 * optionaly switch back to this code (by changing back the 941 * defininitions but this is not advisable. 942 */ 943 int ret; 944 945 ret = sctp_output(inp, inp->pkt, addr, inp->control, p, flags); 946 inp->pkt = NULL; 947 inp->control = NULL; 948 return (ret); 949 } else { 950 return (0); 951 } 952} 953 954static int 955sctp6_connect(struct socket *so, struct sockaddr *addr, struct thread *p) 956{ 957 uint32_t vrf_id; 958 int error = 0; 959 struct sctp_inpcb *inp; 960 struct in6pcb *inp6; 961 struct sctp_tcb *stcb; 962 963#ifdef INET 964 struct sockaddr_in6 *sin6; 965 struct sockaddr_storage ss; 966 967#endif 968 969 inp6 = (struct in6pcb *)so->so_pcb; 970 inp = (struct sctp_inpcb *)so->so_pcb; 971 if (inp == NULL) { 972 SCTP_LTRACE_ERR_RET(inp, NULL, NULL, SCTP_FROM_SCTP6_USRREQ, ECONNRESET); 973 return (ECONNRESET); /* I made the same as TCP since we are 974 * not setup? */ 975 } 976 if (addr == NULL) { 977 SCTP_LTRACE_ERR_RET(inp, NULL, NULL, SCTP_FROM_SCTP6_USRREQ, EINVAL); 978 return (EINVAL); 979 } 980 switch (addr->sa_family) { 981#ifdef INET 982 case AF_INET: 983 if (addr->sa_len != sizeof(struct sockaddr_in)) { 984 SCTP_LTRACE_ERR_RET(inp, NULL, NULL, SCTP_FROM_SCTP6_USRREQ, EINVAL); 985 return (EINVAL); 986 } 987 break; 988#endif 989#ifdef INET6 990 case AF_INET6: 991 if (addr->sa_len != sizeof(struct sockaddr_in6)) { 992 SCTP_LTRACE_ERR_RET(inp, NULL, NULL, SCTP_FROM_SCTP6_USRREQ, EINVAL); 993 return (EINVAL); 994 } 995 break; 996#endif 997 default: 998 SCTP_LTRACE_ERR_RET(inp, NULL, NULL, SCTP_FROM_SCTP6_USRREQ, EINVAL); 999 return (EINVAL); 1000 } 1001 1002 vrf_id = inp->def_vrf_id; 1003 SCTP_ASOC_CREATE_LOCK(inp); 1004 SCTP_INP_RLOCK(inp); 1005 if ((inp->sctp_flags & SCTP_PCB_FLAGS_UNBOUND) == 1006 SCTP_PCB_FLAGS_UNBOUND) { 1007 /* Bind a ephemeral port */ 1008 SCTP_INP_RUNLOCK(inp); 1009 error = sctp6_bind(so, NULL, p); 1010 if (error) { 1011 SCTP_ASOC_CREATE_UNLOCK(inp); 1012 1013 return (error); 1014 } 1015 SCTP_INP_RLOCK(inp); 1016 } 1017 if ((inp->sctp_flags & SCTP_PCB_FLAGS_TCPTYPE) && 1018 (inp->sctp_flags & SCTP_PCB_FLAGS_CONNECTED)) { 1019 /* We are already connected AND the TCP model */ 1020 SCTP_INP_RUNLOCK(inp); 1021 SCTP_ASOC_CREATE_UNLOCK(inp); 1022 SCTP_LTRACE_ERR_RET(inp, NULL, NULL, SCTP_FROM_SCTP6_USRREQ, EADDRINUSE); 1023 return (EADDRINUSE); 1024 } 1025#ifdef INET 1026 sin6 = (struct sockaddr_in6 *)addr; 1027 if (SCTP_IPV6_V6ONLY(inp6)) { 1028 /* 1029 * if IPV6_V6ONLY flag, ignore connections destined to a v4 1030 * addr or v4-mapped addr 1031 */ 1032 if (addr->sa_family == AF_INET) { 1033 SCTP_INP_RUNLOCK(inp); 1034 SCTP_ASOC_CREATE_UNLOCK(inp); 1035 SCTP_LTRACE_ERR_RET(inp, NULL, NULL, SCTP_FROM_SCTP6_USRREQ, EINVAL); 1036 return (EINVAL); 1037 } 1038 if (IN6_IS_ADDR_V4MAPPED(&sin6->sin6_addr)) { 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 if (IN6_IS_ADDR_V4MAPPED(&sin6->sin6_addr)) { 1046 if (!MODULE_GLOBAL(ip6_v6only)) { 1047 /* convert v4-mapped into v4 addr */ 1048 in6_sin6_2_sin((struct sockaddr_in *)&ss, sin6); 1049 addr = (struct sockaddr *)&ss; 1050 } else { 1051 /* mapped addresses aren't enabled */ 1052 SCTP_INP_RUNLOCK(inp); 1053 SCTP_ASOC_CREATE_UNLOCK(inp); 1054 SCTP_LTRACE_ERR_RET(inp, NULL, NULL, SCTP_FROM_SCTP6_USRREQ, EINVAL); 1055 return (EINVAL); 1056 } 1057 } 1058#endif /* INET */ 1059 /* Now do we connect? */ 1060 if (inp->sctp_flags & SCTP_PCB_FLAGS_CONNECTED) { 1061 stcb = LIST_FIRST(&inp->sctp_asoc_list); 1062 if (stcb) { 1063 SCTP_TCB_UNLOCK(stcb); 1064 } 1065 SCTP_INP_RUNLOCK(inp); 1066 } else { 1067 SCTP_INP_RUNLOCK(inp); 1068 SCTP_INP_WLOCK(inp); 1069 SCTP_INP_INCR_REF(inp); 1070 SCTP_INP_WUNLOCK(inp); 1071 stcb = sctp_findassociation_ep_addr(&inp, addr, NULL, NULL, NULL); 1072 if (stcb == NULL) { 1073 SCTP_INP_WLOCK(inp); 1074 SCTP_INP_DECR_REF(inp); 1075 SCTP_INP_WUNLOCK(inp); 1076 } 1077 } 1078 1079 if (stcb != NULL) { 1080 /* Already have or am bring up an association */ 1081 SCTP_ASOC_CREATE_UNLOCK(inp); 1082 SCTP_TCB_UNLOCK(stcb); 1083 SCTP_LTRACE_ERR_RET(inp, NULL, NULL, SCTP_FROM_SCTP6_USRREQ, EALREADY); 1084 return (EALREADY); 1085 } 1086 /* We are GOOD to go */ 1087 stcb = sctp_aloc_assoc(inp, addr, &error, 0, vrf_id, p); 1088 SCTP_ASOC_CREATE_UNLOCK(inp); 1089 if (stcb == NULL) { 1090 /* Gak! no memory */ 1091 return (error); 1092 } 1093 if (stcb->sctp_ep->sctp_flags & SCTP_PCB_FLAGS_TCPTYPE) { 1094 stcb->sctp_ep->sctp_flags |= SCTP_PCB_FLAGS_CONNECTED; 1095 /* Set the connected flag so we can queue data */ 1096 soisconnecting(so); 1097 } 1098 stcb->asoc.state = SCTP_STATE_COOKIE_WAIT; 1099 (void)SCTP_GETTIME_TIMEVAL(&stcb->asoc.time_entered); 1100 1101 /* initialize authentication parameters for the assoc */ 1102 sctp_initialize_auth_params(inp, stcb); 1103 1104 sctp_send_initiate(inp, stcb, SCTP_SO_LOCKED); 1105 SCTP_TCB_UNLOCK(stcb); 1106 return (error); 1107} 1108 1109static int 1110sctp6_getaddr(struct socket *so, struct sockaddr **addr) 1111{ 1112 struct sockaddr_in6 *sin6; 1113 struct sctp_inpcb *inp; 1114 uint32_t vrf_id; 1115 struct sctp_ifa *sctp_ifa; 1116 1117 int error; 1118 1119 /* 1120 * Do the malloc first in case it blocks. 1121 */ 1122 SCTP_MALLOC_SONAME(sin6, struct sockaddr_in6 *, sizeof(*sin6)); 1123 if (sin6 == NULL) 1124 return (ENOMEM); 1125 sin6->sin6_family = AF_INET6; 1126 sin6->sin6_len = sizeof(*sin6); 1127 1128 inp = (struct sctp_inpcb *)so->so_pcb; 1129 if (inp == NULL) { 1130 SCTP_FREE_SONAME(sin6); 1131 SCTP_LTRACE_ERR_RET(inp, NULL, NULL, SCTP_FROM_SCTP6_USRREQ, ECONNRESET); 1132 return (ECONNRESET); 1133 } 1134 SCTP_INP_RLOCK(inp); 1135 sin6->sin6_port = inp->sctp_lport; 1136 if (inp->sctp_flags & SCTP_PCB_FLAGS_BOUNDALL) { 1137 /* For the bound all case you get back 0 */ 1138 if (inp->sctp_flags & SCTP_PCB_FLAGS_CONNECTED) { 1139 struct sctp_tcb *stcb; 1140 struct sockaddr_in6 *sin_a6; 1141 struct sctp_nets *net; 1142 int fnd; 1143 1144 stcb = LIST_FIRST(&inp->sctp_asoc_list); 1145 if (stcb == NULL) { 1146 goto notConn6; 1147 } 1148 fnd = 0; 1149 sin_a6 = NULL; 1150 TAILQ_FOREACH(net, &stcb->asoc.nets, sctp_next) { 1151 sin_a6 = (struct sockaddr_in6 *)&net->ro._l_addr; 1152 if (sin_a6 == NULL) 1153 /* this will make coverity happy */ 1154 continue; 1155 1156 if (sin_a6->sin6_family == AF_INET6) { 1157 fnd = 1; 1158 break; 1159 } 1160 } 1161 if ((!fnd) || (sin_a6 == NULL)) { 1162 /* punt */ 1163 goto notConn6; 1164 } 1165 vrf_id = inp->def_vrf_id; 1166 sctp_ifa = sctp_source_address_selection(inp, stcb, (sctp_route_t *) & net->ro, net, 0, vrf_id); 1167 if (sctp_ifa) { 1168 sin6->sin6_addr = sctp_ifa->address.sin6.sin6_addr; 1169 } 1170 } else { 1171 /* For the bound all case you get back 0 */ 1172 notConn6: 1173 memset(&sin6->sin6_addr, 0, sizeof(sin6->sin6_addr)); 1174 } 1175 } else { 1176 /* Take the first IPv6 address in the list */ 1177 struct sctp_laddr *laddr; 1178 int fnd = 0; 1179 1180 LIST_FOREACH(laddr, &inp->sctp_addr_list, sctp_nxt_addr) { 1181 if (laddr->ifa->address.sa.sa_family == AF_INET6) { 1182 struct sockaddr_in6 *sin_a; 1183 1184 sin_a = (struct sockaddr_in6 *)&laddr->ifa->address.sin6; 1185 sin6->sin6_addr = sin_a->sin6_addr; 1186 fnd = 1; 1187 break; 1188 } 1189 } 1190 if (!fnd) { 1191 SCTP_FREE_SONAME(sin6); 1192 SCTP_INP_RUNLOCK(inp); 1193 SCTP_LTRACE_ERR_RET(inp, NULL, NULL, SCTP_FROM_SCTP6_USRREQ, ENOENT); 1194 return (ENOENT); 1195 } 1196 } 1197 SCTP_INP_RUNLOCK(inp); 1198 /* Scoping things for v6 */ 1199 if ((error = sa6_recoverscope(sin6)) != 0) { 1200 SCTP_FREE_SONAME(sin6); 1201 return (error); 1202 } 1203 (*addr) = (struct sockaddr *)sin6; 1204 return (0); 1205} 1206 1207static int 1208sctp6_peeraddr(struct socket *so, struct sockaddr **addr) 1209{ 1210 struct sockaddr_in6 *sin6; 1211 int fnd; 1212 struct sockaddr_in6 *sin_a6; 1213 struct sctp_inpcb *inp; 1214 struct sctp_tcb *stcb; 1215 struct sctp_nets *net; 1216 int error; 1217 1218 /* Do the malloc first in case it blocks. */ 1219 SCTP_MALLOC_SONAME(sin6, struct sockaddr_in6 *, sizeof *sin6); 1220 if (sin6 == NULL) 1221 return (ENOMEM); 1222 sin6->sin6_family = AF_INET6; 1223 sin6->sin6_len = sizeof(*sin6); 1224 1225 inp = (struct sctp_inpcb *)so->so_pcb; 1226 if ((inp == NULL) || 1227 ((inp->sctp_flags & SCTP_PCB_FLAGS_CONNECTED) == 0)) { 1228 /* UDP type and listeners will drop out here */ 1229 SCTP_FREE_SONAME(sin6); 1230 SCTP_LTRACE_ERR_RET(inp, NULL, NULL, SCTP_FROM_SCTP6_USRREQ, ENOTCONN); 1231 return (ENOTCONN); 1232 } 1233 SCTP_INP_RLOCK(inp); 1234 stcb = LIST_FIRST(&inp->sctp_asoc_list); 1235 if (stcb) { 1236 SCTP_TCB_LOCK(stcb); 1237 } 1238 SCTP_INP_RUNLOCK(inp); 1239 if (stcb == NULL) { 1240 SCTP_FREE_SONAME(sin6); 1241 SCTP_LTRACE_ERR_RET(inp, NULL, NULL, SCTP_FROM_SCTP6_USRREQ, ECONNRESET); 1242 return (ECONNRESET); 1243 } 1244 fnd = 0; 1245 TAILQ_FOREACH(net, &stcb->asoc.nets, sctp_next) { 1246 sin_a6 = (struct sockaddr_in6 *)&net->ro._l_addr; 1247 if (sin_a6->sin6_family == AF_INET6) { 1248 fnd = 1; 1249 sin6->sin6_port = stcb->rport; 1250 sin6->sin6_addr = sin_a6->sin6_addr; 1251 break; 1252 } 1253 } 1254 SCTP_TCB_UNLOCK(stcb); 1255 if (!fnd) { 1256 /* No IPv4 address */ 1257 SCTP_FREE_SONAME(sin6); 1258 SCTP_LTRACE_ERR_RET(inp, NULL, NULL, SCTP_FROM_SCTP6_USRREQ, ENOENT); 1259 return (ENOENT); 1260 } 1261 if ((error = sa6_recoverscope(sin6)) != 0) 1262 return (error); 1263 *addr = (struct sockaddr *)sin6; 1264 return (0); 1265} 1266 1267static int 1268sctp6_in6getaddr(struct socket *so, struct sockaddr **nam) 1269{ 1270#ifdef INET 1271 struct sockaddr *addr; 1272 1273#endif 1274 struct in6pcb *inp6 = sotoin6pcb(so); 1275 int error; 1276 1277 if (inp6 == NULL) { 1278 SCTP_LTRACE_ERR_RET(NULL, NULL, NULL, SCTP_FROM_SCTP6_USRREQ, EINVAL); 1279 return (EINVAL); 1280 } 1281 /* allow v6 addresses precedence */ 1282 error = sctp6_getaddr(so, nam); 1283#ifdef INET 1284 if (error) { 1285 /* try v4 next if v6 failed */ 1286 error = sctp_ingetaddr(so, nam); 1287 if (error) { 1288 return (error); 1289 } 1290 addr = *nam; 1291 /* if I'm V6ONLY, convert it to v4-mapped */ 1292 if (SCTP_IPV6_V6ONLY(inp6)) { 1293 struct sockaddr_in6 sin6; 1294 1295 in6_sin_2_v4mapsin6((struct sockaddr_in *)addr, &sin6); 1296 memcpy(addr, &sin6, sizeof(struct sockaddr_in6)); 1297 } 1298 } 1299#endif 1300 return (error); 1301} 1302 1303 1304static int 1305sctp6_getpeeraddr(struct socket *so, struct sockaddr **nam) 1306{ 1307#ifdef INET 1308 struct sockaddr *addr; 1309 1310#endif 1311 struct in6pcb *inp6 = sotoin6pcb(so); 1312 int error; 1313 1314 if (inp6 == NULL) { 1315 SCTP_LTRACE_ERR_RET(NULL, NULL, NULL, SCTP_FROM_SCTP6_USRREQ, EINVAL); 1316 return (EINVAL); 1317 } 1318 /* allow v6 addresses precedence */ 1319 error = sctp6_peeraddr(so, nam); 1320#ifdef INET 1321 if (error) { 1322 /* try v4 next if v6 failed */ 1323 error = sctp_peeraddr(so, nam); 1324 if (error) { 1325 return (error); 1326 } 1327 addr = *nam; 1328 /* if I'm V6ONLY, convert it to v4-mapped */ 1329 if (SCTP_IPV6_V6ONLY(inp6)) { 1330 struct sockaddr_in6 sin6; 1331 1332 in6_sin_2_v4mapsin6((struct sockaddr_in *)addr, &sin6); 1333 memcpy(addr, &sin6, sizeof(struct sockaddr_in6)); 1334 } 1335 } 1336#endif 1337 return (error); 1338} 1339 1340struct pr_usrreqs sctp6_usrreqs = { 1341 .pru_abort = sctp6_abort, 1342 .pru_accept = sctp_accept, 1343 .pru_attach = sctp6_attach, 1344 .pru_bind = sctp6_bind, 1345 .pru_connect = sctp6_connect, 1346 .pru_control = in6_control, 1347 .pru_close = sctp6_close, 1348 .pru_detach = sctp6_close, 1349 .pru_sopoll = sopoll_generic, 1350 .pru_flush = sctp_flush, 1351 .pru_disconnect = sctp6_disconnect, 1352 .pru_listen = sctp_listen, 1353 .pru_peeraddr = sctp6_getpeeraddr, 1354 .pru_send = sctp6_send, 1355 .pru_shutdown = sctp_shutdown, 1356 .pru_sockaddr = sctp6_in6getaddr, 1357 .pru_sosend = sctp_sosend, 1358 .pru_soreceive = sctp_soreceive 1359}; 1360 1361#endif 1362