sctp6_usrreq.c revision 238249
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 238249 2012-07-08 15:37:58Z 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 sh->checksum = 0; /* prepare for calc */ 154 calc_check = sctp_calculate_cksum(m, iphlen); 155 SCTP_STAT_INCR(sctps_recvswcrc); 156 if (calc_check != check) { 157 SCTPDBG(SCTP_DEBUG_INPUT1, "Bad CSUM on SCTP packet calc_check:%x check:%x m:%p phlen:%d\n", 158 calc_check, check, m, iphlen); 159 stcb = sctp_findassociation_addr(m, offset - sizeof(*ch), 160 sh, ch, &in6p, &net, vrf_id); 161 if ((net) && (port)) { 162 if (net->port == 0) { 163 sctp_pathmtu_adjustment(stcb, net->mtu - sizeof(struct udphdr)); 164 } 165 net->port = port; 166 } 167 if ((net != NULL) && (m->m_flags & M_FLOWID)) { 168 net->flowid = m->m_pkthdr.flowid; 169#ifdef INVARIANTS 170 net->flowidset = 1; 171#endif 172 } 173 /* in6p's ref-count increased && stcb locked */ 174 if ((in6p) && (stcb)) { 175 sctp_send_packet_dropped(stcb, net, m, iphlen, 1); 176 sctp_chunk_output((struct sctp_inpcb *)in6p, stcb, SCTP_OUTPUT_FROM_INPUT_ERROR, SCTP_SO_NOT_LOCKED); 177 } else if ((in6p != NULL) && (stcb == NULL)) { 178 refcount_up = 1; 179 } 180 SCTP_STAT_INCR(sctps_badsum); 181 SCTP_STAT_INCR_COUNTER32(sctps_checksumerrors); 182 goto bad; 183 } 184 sh->checksum = calc_check; 185 186sctp_skip_csum: 187#endif 188 net = NULL; 189 /* 190 * Locate pcb and tcb for datagram sctp_findassociation_addr() wants 191 * IP/SCTP/first chunk header... 192 */ 193 stcb = sctp_findassociation_addr(m, offset - sizeof(*ch), 194 sh, ch, &in6p, &net, vrf_id); 195 if ((net) && (port)) { 196 if (net->port == 0) { 197 sctp_pathmtu_adjustment(stcb, net->mtu - sizeof(struct udphdr)); 198 } 199 net->port = port; 200 } 201 if ((net != NULL) && (m->m_flags & M_FLOWID)) { 202 net->flowid = m->m_pkthdr.flowid; 203#ifdef INVARIANTS 204 net->flowidset = 1; 205#endif 206 } 207 /* in6p's ref-count increased */ 208 if (in6p == NULL) { 209 struct sctp_init_chunk *init_chk, chunk_buf; 210 211 SCTP_STAT_INCR(sctps_noport); 212 if (ch->chunk_type == SCTP_INITIATION) { 213 /* 214 * we do a trick here to get the INIT tag, dig in 215 * and get the tag from the INIT and put it in the 216 * common header. 217 */ 218 init_chk = (struct sctp_init_chunk *)sctp_m_getptr(m, 219 iphlen + sizeof(*sh), sizeof(*init_chk), 220 (uint8_t *) & chunk_buf); 221 if (init_chk) 222 sh->v_tag = init_chk->init.initiate_tag; 223 else 224 sh->v_tag = 0; 225 } 226 if (ch->chunk_type == SCTP_SHUTDOWN_ACK) { 227 sctp_send_shutdown_complete2(m, sh, vrf_id, port); 228 goto bad; 229 } 230 if (ch->chunk_type == SCTP_SHUTDOWN_COMPLETE) { 231 goto bad; 232 } 233 if (ch->chunk_type != SCTP_ABORT_ASSOCIATION) { 234 if ((SCTP_BASE_SYSCTL(sctp_blackhole) == 0) || 235 ((SCTP_BASE_SYSCTL(sctp_blackhole) == 1) && 236 (ch->chunk_type != SCTP_INIT))) { 237 sctp_send_abort(m, iphlen, sh, 0, NULL, vrf_id, port); 238 } 239 } 240 goto bad; 241 } else if (stcb == NULL) { 242 refcount_up = 1; 243 } 244#ifdef IPSEC 245 /* 246 * Check AH/ESP integrity. 247 */ 248 in6p_ip = (struct inpcb *)in6p; 249 if (in6p_ip && (ipsec6_in_reject(m, in6p_ip))) { 250/* XXX */ 251 MODULE_GLOBAL(ipsec6stat).in_polvio++; 252 goto bad; 253 } 254#endif /* IPSEC */ 255 256 /* 257 * CONTROL chunk processing 258 */ 259 offset -= sizeof(*ch); 260 ecn_bits = ((ntohl(ip6->ip6_flow) >> 20) & 0x000000ff); 261 262 /* Length now holds the total packet length payload + iphlen */ 263 length = ntohs(ip6->ip6_plen) + iphlen; 264 265 /* sa_ignore NO_NULL_CHK */ 266 sctp_common_input_processing(&m, iphlen, offset, length, sh, ch, 267 in6p, stcb, net, ecn_bits, vrf_id, port); 268 /* inp's ref-count reduced && stcb unlocked */ 269 /* XXX this stuff below gets moved to appropriate parts later... */ 270 if (m) 271 sctp_m_freem(m); 272 if ((in6p) && refcount_up) { 273 /* reduce ref-count */ 274 SCTP_INP_WLOCK(in6p); 275 SCTP_INP_DECR_REF(in6p); 276 SCTP_INP_WUNLOCK(in6p); 277 } 278 return (IPPROTO_DONE); 279 280bad: 281 if (stcb) { 282 SCTP_TCB_UNLOCK(stcb); 283 } 284 if ((in6p) && refcount_up) { 285 /* reduce ref-count */ 286 SCTP_INP_WLOCK(in6p); 287 SCTP_INP_DECR_REF(in6p); 288 SCTP_INP_WUNLOCK(in6p); 289 } 290 if (m) 291 sctp_m_freem(m); 292 return (IPPROTO_DONE); 293} 294 295 296static void 297sctp6_notify_mbuf(struct sctp_inpcb *inp, struct icmp6_hdr *icmp6, 298 struct sctphdr *sh, struct sctp_tcb *stcb, struct sctp_nets *net) 299{ 300 uint32_t nxtsz; 301 302 if ((inp == NULL) || (stcb == NULL) || (net == NULL) || 303 (icmp6 == NULL) || (sh == NULL)) { 304 goto out; 305 } 306 /* First do we even look at it? */ 307 if (ntohl(sh->v_tag) != (stcb->asoc.peer_vtag)) 308 goto out; 309 310 if (icmp6->icmp6_type != ICMP6_PACKET_TOO_BIG) { 311 /* not PACKET TO BIG */ 312 goto out; 313 } 314 /* 315 * ok we need to look closely. We could even get smarter and look at 316 * anyone that we sent to in case we get a different ICMP that tells 317 * us there is no way to reach a host, but for this impl, all we 318 * care about is MTU discovery. 319 */ 320 nxtsz = ntohl(icmp6->icmp6_mtu); 321 /* Stop any PMTU timer */ 322 sctp_timer_stop(SCTP_TIMER_TYPE_PATHMTURAISE, inp, stcb, NULL, SCTP_FROM_SCTP6_USRREQ + SCTP_LOC_1); 323 324 /* Adjust destination size limit */ 325 if (net->mtu > nxtsz) { 326 net->mtu = nxtsz; 327 if (net->port) { 328 net->mtu -= sizeof(struct udphdr); 329 } 330 } 331 /* now what about the ep? */ 332 if (stcb->asoc.smallest_mtu > nxtsz) { 333 struct sctp_tmit_chunk *chk; 334 335 /* Adjust that too */ 336 stcb->asoc.smallest_mtu = nxtsz; 337 /* now off to subtract IP_DF flag if needed */ 338 339 TAILQ_FOREACH(chk, &stcb->asoc.send_queue, sctp_next) { 340 if ((uint32_t) (chk->send_size + IP_HDR_SIZE) > nxtsz) { 341 chk->flags |= CHUNK_FLAGS_FRAGMENT_OK; 342 } 343 } 344 TAILQ_FOREACH(chk, &stcb->asoc.sent_queue, sctp_next) { 345 if ((uint32_t) (chk->send_size + IP_HDR_SIZE) > nxtsz) { 346 /* 347 * For this guy we also mark for immediate 348 * resend since we sent to big of chunk 349 */ 350 chk->flags |= CHUNK_FLAGS_FRAGMENT_OK; 351 if (chk->sent != SCTP_DATAGRAM_RESEND) 352 stcb->asoc.sent_queue_retran_cnt++; 353 chk->sent = SCTP_DATAGRAM_RESEND; 354 chk->rec.data.doing_fast_retransmit = 0; 355 356 chk->sent = SCTP_DATAGRAM_RESEND; 357 /* Clear any time so NO RTT is being done */ 358 chk->sent_rcv_time.tv_sec = 0; 359 chk->sent_rcv_time.tv_usec = 0; 360 stcb->asoc.total_flight -= chk->send_size; 361 net->flight_size -= chk->send_size; 362 } 363 } 364 } 365 sctp_timer_start(SCTP_TIMER_TYPE_PATHMTURAISE, inp, stcb, NULL); 366out: 367 if (stcb) { 368 SCTP_TCB_UNLOCK(stcb); 369 } 370} 371 372 373void 374sctp6_notify(struct sctp_inpcb *inp, 375 struct icmp6_hdr *icmph, 376 struct sctphdr *sh, 377 struct sockaddr *to, 378 struct sctp_tcb *stcb, 379 struct sctp_nets *net) 380{ 381#if defined (__APPLE__) || defined(SCTP_SO_LOCK_TESTING) 382 struct socket *so; 383 384#endif 385 386 /* protection */ 387 if ((inp == NULL) || (stcb == NULL) || (net == NULL) || 388 (sh == NULL) || (to == NULL)) { 389 if (stcb) 390 SCTP_TCB_UNLOCK(stcb); 391 return; 392 } 393 /* First job is to verify the vtag matches what I would send */ 394 if (ntohl(sh->v_tag) != (stcb->asoc.peer_vtag)) { 395 SCTP_TCB_UNLOCK(stcb); 396 return; 397 } 398 if (icmph->icmp6_type != ICMP_UNREACH) { 399 /* We only care about unreachable */ 400 SCTP_TCB_UNLOCK(stcb); 401 return; 402 } 403 if ((icmph->icmp6_code == ICMP_UNREACH_NET) || 404 (icmph->icmp6_code == ICMP_UNREACH_HOST) || 405 (icmph->icmp6_code == ICMP_UNREACH_NET_UNKNOWN) || 406 (icmph->icmp6_code == ICMP_UNREACH_HOST_UNKNOWN) || 407 (icmph->icmp6_code == ICMP_UNREACH_ISOLATED) || 408 (icmph->icmp6_code == ICMP_UNREACH_NET_PROHIB) || 409 (icmph->icmp6_code == ICMP_UNREACH_HOST_PROHIB) || 410 (icmph->icmp6_code == ICMP_UNREACH_FILTER_PROHIB)) { 411 412 /* 413 * Hmm reachablity problems we must examine closely. If its 414 * not reachable, we may have lost a network. Or if there is 415 * NO protocol at the other end named SCTP. well we consider 416 * it a OOTB abort. 417 */ 418 if (net->dest_state & SCTP_ADDR_REACHABLE) { 419 /* Ok that destination is NOT reachable */ 420 net->dest_state &= ~SCTP_ADDR_REACHABLE; 421 net->dest_state &= ~SCTP_ADDR_PF; 422 sctp_ulp_notify(SCTP_NOTIFY_INTERFACE_DOWN, 423 stcb, 0, (void *)net, SCTP_SO_NOT_LOCKED); 424 } 425 SCTP_TCB_UNLOCK(stcb); 426 } else if ((icmph->icmp6_code == ICMP_UNREACH_PROTOCOL) || 427 (icmph->icmp6_code == ICMP_UNREACH_PORT)) { 428 /* 429 * Here the peer is either playing tricks on us, including 430 * an address that belongs to someone who does not support 431 * SCTP OR was a userland implementation that shutdown and 432 * now is dead. In either case treat it like a OOTB abort 433 * with no TCB 434 */ 435 sctp_abort_notification(stcb, 1, 0, NULL, SCTP_SO_NOT_LOCKED); 436#if defined (__APPLE__) || defined(SCTP_SO_LOCK_TESTING) 437 so = SCTP_INP_SO(inp); 438 atomic_add_int(&stcb->asoc.refcnt, 1); 439 SCTP_TCB_UNLOCK(stcb); 440 SCTP_SOCKET_LOCK(so, 1); 441 SCTP_TCB_LOCK(stcb); 442 atomic_subtract_int(&stcb->asoc.refcnt, 1); 443#endif 444 (void)sctp_free_assoc(inp, stcb, SCTP_NORMAL_PROC, SCTP_FROM_SCTP_USRREQ + SCTP_LOC_2); 445#if defined (__APPLE__) || defined(SCTP_SO_LOCK_TESTING) 446 SCTP_SOCKET_UNLOCK(so, 1); 447 /* SCTP_TCB_UNLOCK(stcb); MT: I think this is not needed. */ 448#endif 449 /* no need to unlock here, since the TCB is gone */ 450 } else { 451 SCTP_TCB_UNLOCK(stcb); 452 } 453} 454 455 456 457void 458sctp6_ctlinput(int cmd, struct sockaddr *pktdst, void *d) 459{ 460 struct sctphdr sh; 461 struct ip6ctlparam *ip6cp = NULL; 462 uint32_t vrf_id; 463 464 vrf_id = SCTP_DEFAULT_VRFID; 465 466 if (pktdst->sa_family != AF_INET6 || 467 pktdst->sa_len != sizeof(struct sockaddr_in6)) 468 return; 469 470 if ((unsigned)cmd >= PRC_NCMDS) 471 return; 472 if (PRC_IS_REDIRECT(cmd)) { 473 d = NULL; 474 } else if (inet6ctlerrmap[cmd] == 0) { 475 return; 476 } 477 /* if the parameter is from icmp6, decode it. */ 478 if (d != NULL) { 479 ip6cp = (struct ip6ctlparam *)d; 480 } else { 481 ip6cp = (struct ip6ctlparam *)NULL; 482 } 483 484 if (ip6cp) { 485 /* 486 * XXX: We assume that when IPV6 is non NULL, M and OFF are 487 * valid. 488 */ 489 /* check if we can safely examine src and dst ports */ 490 struct sctp_inpcb *inp = NULL; 491 struct sctp_tcb *stcb = NULL; 492 struct sctp_nets *net = NULL; 493 struct sockaddr_in6 final; 494 495 if (ip6cp->ip6c_m == NULL) 496 return; 497 498 bzero(&sh, sizeof(sh)); 499 bzero(&final, sizeof(final)); 500 inp = NULL; 501 net = NULL; 502 m_copydata(ip6cp->ip6c_m, ip6cp->ip6c_off, sizeof(sh), 503 (caddr_t)&sh); 504 ip6cp->ip6c_src->sin6_port = sh.src_port; 505 final.sin6_len = sizeof(final); 506 final.sin6_family = AF_INET6; 507 final.sin6_addr = ((struct sockaddr_in6 *)pktdst)->sin6_addr; 508 final.sin6_port = sh.dest_port; 509 stcb = sctp_findassociation_addr_sa((struct sockaddr *)ip6cp->ip6c_src, 510 (struct sockaddr *)&final, 511 &inp, &net, 1, vrf_id); 512 /* inp's ref-count increased && stcb locked */ 513 if (stcb != NULL && inp && (inp->sctp_socket != NULL)) { 514 if (cmd == PRC_MSGSIZE) { 515 sctp6_notify_mbuf(inp, 516 ip6cp->ip6c_icmp6, 517 &sh, 518 stcb, 519 net); 520 /* inp's ref-count reduced && stcb unlocked */ 521 } else { 522 sctp6_notify(inp, ip6cp->ip6c_icmp6, &sh, 523 (struct sockaddr *)&final, 524 stcb, net); 525 /* inp's ref-count reduced && stcb unlocked */ 526 } 527 } else { 528 if (PRC_IS_REDIRECT(cmd) && inp) { 529 in6_rtchange((struct in6pcb *)inp, 530 inet6ctlerrmap[cmd]); 531 } 532 if (inp) { 533 /* reduce inp's ref-count */ 534 SCTP_INP_WLOCK(inp); 535 SCTP_INP_DECR_REF(inp); 536 SCTP_INP_WUNLOCK(inp); 537 } 538 if (stcb) 539 SCTP_TCB_UNLOCK(stcb); 540 } 541 } 542} 543 544/* 545 * this routine can probably be collasped into the one in sctp_userreq.c 546 * since they do the same thing and now we lookup with a sockaddr 547 */ 548static int 549sctp6_getcred(SYSCTL_HANDLER_ARGS) 550{ 551 struct xucred xuc; 552 struct sockaddr_in6 addrs[2]; 553 struct sctp_inpcb *inp; 554 struct sctp_nets *net; 555 struct sctp_tcb *stcb; 556 int error; 557 uint32_t vrf_id; 558 559 vrf_id = SCTP_DEFAULT_VRFID; 560 561 error = priv_check(req->td, PRIV_NETINET_GETCRED); 562 if (error) 563 return (error); 564 565 if (req->newlen != sizeof(addrs)) { 566 SCTP_LTRACE_ERR_RET(NULL, NULL, NULL, SCTP_FROM_SCTP6_USRREQ, EINVAL); 567 return (EINVAL); 568 } 569 if (req->oldlen != sizeof(struct ucred)) { 570 SCTP_LTRACE_ERR_RET(NULL, NULL, NULL, SCTP_FROM_SCTP6_USRREQ, EINVAL); 571 return (EINVAL); 572 } 573 error = SYSCTL_IN(req, addrs, sizeof(addrs)); 574 if (error) 575 return (error); 576 577 stcb = sctp_findassociation_addr_sa(sin6tosa(&addrs[0]), 578 sin6tosa(&addrs[1]), 579 &inp, &net, 1, vrf_id); 580 if (stcb == NULL || inp == NULL || inp->sctp_socket == NULL) { 581 if ((inp != NULL) && (stcb == NULL)) { 582 /* reduce ref-count */ 583 SCTP_INP_WLOCK(inp); 584 SCTP_INP_DECR_REF(inp); 585 goto cred_can_cont; 586 } 587 SCTP_LTRACE_ERR_RET(inp, NULL, NULL, SCTP_FROM_SCTP6_USRREQ, ENOENT); 588 error = ENOENT; 589 goto out; 590 } 591 SCTP_TCB_UNLOCK(stcb); 592 /* 593 * We use the write lock here, only since in the error leg we need 594 * it. If we used RLOCK, then we would have to 595 * wlock/decr/unlock/rlock. Which in theory could create a hole. 596 * Better to use higher wlock. 597 */ 598 SCTP_INP_WLOCK(inp); 599cred_can_cont: 600 error = cr_canseesocket(req->td->td_ucred, inp->sctp_socket); 601 if (error) { 602 SCTP_INP_WUNLOCK(inp); 603 goto out; 604 } 605 cru2x(inp->sctp_socket->so_cred, &xuc); 606 SCTP_INP_WUNLOCK(inp); 607 error = SYSCTL_OUT(req, &xuc, sizeof(struct xucred)); 608out: 609 return (error); 610} 611 612SYSCTL_PROC(_net_inet6_sctp6, OID_AUTO, getcred, CTLTYPE_OPAQUE | CTLFLAG_RW, 613 0, 0, 614 sctp6_getcred, "S,ucred", "Get the ucred of a SCTP6 connection"); 615 616 617/* This is the same as the sctp_abort() could be made common */ 618static void 619sctp6_abort(struct socket *so) 620{ 621 struct sctp_inpcb *inp; 622 uint32_t flags; 623 624 inp = (struct sctp_inpcb *)so->so_pcb; 625 if (inp == NULL) { 626 SCTP_LTRACE_ERR_RET(inp, NULL, NULL, SCTP_FROM_SCTP6_USRREQ, EINVAL); 627 return; 628 } 629sctp_must_try_again: 630 flags = inp->sctp_flags; 631#ifdef SCTP_LOG_CLOSING 632 sctp_log_closing(inp, NULL, 17); 633#endif 634 if (((flags & SCTP_PCB_FLAGS_SOCKET_GONE) == 0) && 635 (atomic_cmpset_int(&inp->sctp_flags, flags, (flags | SCTP_PCB_FLAGS_SOCKET_GONE | SCTP_PCB_FLAGS_CLOSE_IP)))) { 636#ifdef SCTP_LOG_CLOSING 637 sctp_log_closing(inp, NULL, 16); 638#endif 639 sctp_inpcb_free(inp, SCTP_FREE_SHOULD_USE_ABORT, 640 SCTP_CALLED_AFTER_CMPSET_OFCLOSE); 641 SOCK_LOCK(so); 642 SCTP_SB_CLEAR(so->so_snd); 643 /* 644 * same for the rcv ones, they are only here for the 645 * accounting/select. 646 */ 647 SCTP_SB_CLEAR(so->so_rcv); 648 /* Now null out the reference, we are completely detached. */ 649 so->so_pcb = NULL; 650 SOCK_UNLOCK(so); 651 } else { 652 flags = inp->sctp_flags; 653 if ((flags & SCTP_PCB_FLAGS_SOCKET_GONE) == 0) { 654 goto sctp_must_try_again; 655 } 656 } 657 return; 658} 659 660static int 661sctp6_attach(struct socket *so, int proto SCTP_UNUSED, struct thread *p SCTP_UNUSED) 662{ 663 struct in6pcb *inp6; 664 int error; 665 struct sctp_inpcb *inp; 666 uint32_t vrf_id = SCTP_DEFAULT_VRFID; 667 668 inp = (struct sctp_inpcb *)so->so_pcb; 669 if (inp != NULL) { 670 SCTP_LTRACE_ERR_RET(inp, NULL, NULL, SCTP_FROM_SCTP6_USRREQ, EINVAL); 671 return (EINVAL); 672 } 673 if (so->so_snd.sb_hiwat == 0 || so->so_rcv.sb_hiwat == 0) { 674 error = SCTP_SORESERVE(so, SCTP_BASE_SYSCTL(sctp_sendspace), SCTP_BASE_SYSCTL(sctp_recvspace)); 675 if (error) 676 return (error); 677 } 678 error = sctp_inpcb_alloc(so, vrf_id); 679 if (error) 680 return (error); 681 inp = (struct sctp_inpcb *)so->so_pcb; 682 SCTP_INP_WLOCK(inp); 683 inp->sctp_flags |= SCTP_PCB_FLAGS_BOUND_V6; /* I'm v6! */ 684 inp6 = (struct in6pcb *)inp; 685 686 inp6->inp_vflag |= INP_IPV6; 687 inp6->in6p_hops = -1; /* use kernel default */ 688 inp6->in6p_cksum = -1; /* just to be sure */ 689#ifdef INET 690 /* 691 * XXX: ugly!! IPv4 TTL initialization is necessary for an IPv6 692 * socket as well, because the socket may be bound to an IPv6 693 * wildcard address, which may match an IPv4-mapped IPv6 address. 694 */ 695 inp6->inp_ip_ttl = MODULE_GLOBAL(ip_defttl); 696#endif 697 /* 698 * Hmm what about the IPSEC stuff that is missing here but in 699 * sctp_attach()? 700 */ 701 SCTP_INP_WUNLOCK(inp); 702 return (0); 703} 704 705static int 706sctp6_bind(struct socket *so, struct sockaddr *addr, struct thread *p) 707{ 708 struct sctp_inpcb *inp; 709 struct in6pcb *inp6; 710 int error; 711 712 inp = (struct sctp_inpcb *)so->so_pcb; 713 if (inp == NULL) { 714 SCTP_LTRACE_ERR_RET(inp, NULL, NULL, SCTP_FROM_SCTP6_USRREQ, EINVAL); 715 return (EINVAL); 716 } 717 if (addr) { 718 switch (addr->sa_family) { 719#ifdef INET 720 case AF_INET: 721 if (addr->sa_len != sizeof(struct sockaddr_in)) { 722 SCTP_LTRACE_ERR_RET(inp, NULL, NULL, SCTP_FROM_SCTP6_USRREQ, EINVAL); 723 return (EINVAL); 724 } 725 break; 726#endif 727#ifdef INET6 728 case AF_INET6: 729 if (addr->sa_len != sizeof(struct sockaddr_in6)) { 730 SCTP_LTRACE_ERR_RET(inp, NULL, NULL, SCTP_FROM_SCTP6_USRREQ, EINVAL); 731 return (EINVAL); 732 } 733 break; 734#endif 735 default: 736 SCTP_LTRACE_ERR_RET(inp, NULL, NULL, SCTP_FROM_SCTP6_USRREQ, EINVAL); 737 return (EINVAL); 738 } 739 } 740 inp6 = (struct in6pcb *)inp; 741 inp6->inp_vflag &= ~INP_IPV4; 742 inp6->inp_vflag |= INP_IPV6; 743 if ((addr != NULL) && (SCTP_IPV6_V6ONLY(inp6) == 0)) { 744 switch (addr->sa_family) { 745#ifdef INET 746 case AF_INET: 747 /* binding v4 addr to v6 socket, so reset flags */ 748 inp6->inp_vflag |= INP_IPV4; 749 inp6->inp_vflag &= ~INP_IPV6; 750 break; 751#endif 752#ifdef INET6 753 case AF_INET6: 754 { 755 struct sockaddr_in6 *sin6_p; 756 757 sin6_p = (struct sockaddr_in6 *)addr; 758 759 if (IN6_IS_ADDR_UNSPECIFIED(&sin6_p->sin6_addr)) { 760 inp6->inp_vflag |= INP_IPV4; 761 } 762#ifdef INET 763 if (IN6_IS_ADDR_V4MAPPED(&sin6_p->sin6_addr)) { 764 struct sockaddr_in sin; 765 766 in6_sin6_2_sin(&sin, sin6_p); 767 inp6->inp_vflag |= INP_IPV4; 768 inp6->inp_vflag &= ~INP_IPV6; 769 error = sctp_inpcb_bind(so, (struct sockaddr *)&sin, NULL, p); 770 return (error); 771 } 772#endif 773 break; 774 } 775#endif 776 default: 777 break; 778 } 779 } else if (addr != NULL) { 780 struct sockaddr_in6 *sin6_p; 781 782 /* IPV6_V6ONLY socket */ 783#ifdef INET 784 if (addr->sa_family == AF_INET) { 785 /* can't bind v4 addr to v6 only socket! */ 786 SCTP_LTRACE_ERR_RET(inp, NULL, NULL, SCTP_FROM_SCTP6_USRREQ, EINVAL); 787 return (EINVAL); 788 } 789#endif 790 sin6_p = (struct sockaddr_in6 *)addr; 791 792 if (IN6_IS_ADDR_V4MAPPED(&sin6_p->sin6_addr)) { 793 /* can't bind v4-mapped addrs either! */ 794 /* NOTE: we don't support SIIT */ 795 SCTP_LTRACE_ERR_RET(inp, NULL, NULL, SCTP_FROM_SCTP6_USRREQ, EINVAL); 796 return (EINVAL); 797 } 798 } 799 error = sctp_inpcb_bind(so, addr, NULL, p); 800 return (error); 801} 802 803 804static void 805sctp6_close(struct socket *so) 806{ 807 sctp_close(so); 808} 809 810/* This could be made common with sctp_detach() since they are identical */ 811 812static 813int 814sctp6_disconnect(struct socket *so) 815{ 816 return (sctp_disconnect(so)); 817} 818 819 820int 821sctp_sendm(struct socket *so, int flags, struct mbuf *m, struct sockaddr *addr, 822 struct mbuf *control, struct thread *p); 823 824 825static int 826sctp6_send(struct socket *so, int flags, struct mbuf *m, struct sockaddr *addr, 827 struct mbuf *control, struct thread *p) 828{ 829 struct sctp_inpcb *inp; 830 struct in6pcb *inp6; 831 832#ifdef INET 833 struct sockaddr_in6 *sin6; 834 835#endif /* INET */ 836 /* No SPL needed since sctp_output does this */ 837 838 inp = (struct sctp_inpcb *)so->so_pcb; 839 if (inp == NULL) { 840 if (control) { 841 SCTP_RELEASE_PKT(control); 842 control = NULL; 843 } 844 SCTP_RELEASE_PKT(m); 845 SCTP_LTRACE_ERR_RET(inp, NULL, NULL, SCTP_FROM_SCTP6_USRREQ, EINVAL); 846 return (EINVAL); 847 } 848 inp6 = (struct in6pcb *)inp; 849 /* 850 * For the TCP model we may get a NULL addr, if we are a connected 851 * socket thats ok. 852 */ 853 if ((inp->sctp_flags & SCTP_PCB_FLAGS_CONNECTED) && 854 (addr == NULL)) { 855 goto connected_type; 856 } 857 if (addr == NULL) { 858 SCTP_RELEASE_PKT(m); 859 if (control) { 860 SCTP_RELEASE_PKT(control); 861 control = NULL; 862 } 863 SCTP_LTRACE_ERR_RET(inp, NULL, NULL, SCTP_FROM_SCTP6_USRREQ, EDESTADDRREQ); 864 return (EDESTADDRREQ); 865 } 866#ifdef INET 867 sin6 = (struct sockaddr_in6 *)addr; 868 if (SCTP_IPV6_V6ONLY(inp6)) { 869 /* 870 * if IPV6_V6ONLY flag, we discard datagrams destined to a 871 * v4 addr or v4-mapped addr 872 */ 873 if (addr->sa_family == AF_INET) { 874 SCTP_LTRACE_ERR_RET(inp, NULL, NULL, SCTP_FROM_SCTP6_USRREQ, EINVAL); 875 return (EINVAL); 876 } 877 if (IN6_IS_ADDR_V4MAPPED(&sin6->sin6_addr)) { 878 SCTP_LTRACE_ERR_RET(inp, NULL, NULL, SCTP_FROM_SCTP6_USRREQ, EINVAL); 879 return (EINVAL); 880 } 881 } 882 if (IN6_IS_ADDR_V4MAPPED(&sin6->sin6_addr)) { 883 if (!MODULE_GLOBAL(ip6_v6only)) { 884 struct sockaddr_in sin; 885 886 /* convert v4-mapped into v4 addr and send */ 887 in6_sin6_2_sin(&sin, sin6); 888 return (sctp_sendm(so, flags, m, (struct sockaddr *)&sin, 889 control, p)); 890 } else { 891 /* mapped addresses aren't enabled */ 892 SCTP_LTRACE_ERR_RET(inp, NULL, NULL, SCTP_FROM_SCTP6_USRREQ, EINVAL); 893 return (EINVAL); 894 } 895 } 896#endif /* INET */ 897connected_type: 898 /* now what about control */ 899 if (control) { 900 if (inp->control) { 901 SCTP_PRINTF("huh? control set?\n"); 902 SCTP_RELEASE_PKT(inp->control); 903 inp->control = NULL; 904 } 905 inp->control = control; 906 } 907 /* Place the data */ 908 if (inp->pkt) { 909 SCTP_BUF_NEXT(inp->pkt_last) = m; 910 inp->pkt_last = m; 911 } else { 912 inp->pkt_last = inp->pkt = m; 913 } 914 if ( 915 /* FreeBSD and MacOSX uses a flag passed */ 916 ((flags & PRUS_MORETOCOME) == 0) 917 ) { 918 /* 919 * note with the current version this code will only be used 920 * by OpenBSD, NetBSD and FreeBSD have methods for 921 * re-defining sosend() to use sctp_sosend(). One can 922 * optionaly switch back to this code (by changing back the 923 * defininitions but this is not advisable. 924 */ 925 int ret; 926 927 ret = sctp_output(inp, inp->pkt, addr, inp->control, p, flags); 928 inp->pkt = NULL; 929 inp->control = NULL; 930 return (ret); 931 } else { 932 return (0); 933 } 934} 935 936static int 937sctp6_connect(struct socket *so, struct sockaddr *addr, struct thread *p) 938{ 939 uint32_t vrf_id; 940 int error = 0; 941 struct sctp_inpcb *inp; 942 struct in6pcb *inp6; 943 struct sctp_tcb *stcb; 944 945#ifdef INET 946 struct sockaddr_in6 *sin6; 947 struct sockaddr_storage ss; 948 949#endif 950 951 inp6 = (struct in6pcb *)so->so_pcb; 952 inp = (struct sctp_inpcb *)so->so_pcb; 953 if (inp == NULL) { 954 SCTP_LTRACE_ERR_RET(inp, NULL, NULL, SCTP_FROM_SCTP6_USRREQ, ECONNRESET); 955 return (ECONNRESET); /* I made the same as TCP since we are 956 * not setup? */ 957 } 958 if (addr == NULL) { 959 SCTP_LTRACE_ERR_RET(inp, NULL, NULL, SCTP_FROM_SCTP6_USRREQ, EINVAL); 960 return (EINVAL); 961 } 962 switch (addr->sa_family) { 963#ifdef INET 964 case AF_INET: 965 if (addr->sa_len != sizeof(struct sockaddr_in)) { 966 SCTP_LTRACE_ERR_RET(inp, NULL, NULL, SCTP_FROM_SCTP6_USRREQ, EINVAL); 967 return (EINVAL); 968 } 969 break; 970#endif 971#ifdef INET6 972 case AF_INET6: 973 if (addr->sa_len != sizeof(struct sockaddr_in6)) { 974 SCTP_LTRACE_ERR_RET(inp, NULL, NULL, SCTP_FROM_SCTP6_USRREQ, EINVAL); 975 return (EINVAL); 976 } 977 break; 978#endif 979 default: 980 SCTP_LTRACE_ERR_RET(inp, NULL, NULL, SCTP_FROM_SCTP6_USRREQ, EINVAL); 981 return (EINVAL); 982 } 983 984 vrf_id = inp->def_vrf_id; 985 SCTP_ASOC_CREATE_LOCK(inp); 986 SCTP_INP_RLOCK(inp); 987 if ((inp->sctp_flags & SCTP_PCB_FLAGS_UNBOUND) == 988 SCTP_PCB_FLAGS_UNBOUND) { 989 /* Bind a ephemeral port */ 990 SCTP_INP_RUNLOCK(inp); 991 error = sctp6_bind(so, NULL, p); 992 if (error) { 993 SCTP_ASOC_CREATE_UNLOCK(inp); 994 995 return (error); 996 } 997 SCTP_INP_RLOCK(inp); 998 } 999 if ((inp->sctp_flags & SCTP_PCB_FLAGS_TCPTYPE) && 1000 (inp->sctp_flags & SCTP_PCB_FLAGS_CONNECTED)) { 1001 /* We are already connected AND the TCP model */ 1002 SCTP_INP_RUNLOCK(inp); 1003 SCTP_ASOC_CREATE_UNLOCK(inp); 1004 SCTP_LTRACE_ERR_RET(inp, NULL, NULL, SCTP_FROM_SCTP6_USRREQ, EADDRINUSE); 1005 return (EADDRINUSE); 1006 } 1007#ifdef INET 1008 sin6 = (struct sockaddr_in6 *)addr; 1009 if (SCTP_IPV6_V6ONLY(inp6)) { 1010 /* 1011 * if IPV6_V6ONLY flag, ignore connections destined to a v4 1012 * addr or v4-mapped addr 1013 */ 1014 if (addr->sa_family == AF_INET) { 1015 SCTP_INP_RUNLOCK(inp); 1016 SCTP_ASOC_CREATE_UNLOCK(inp); 1017 SCTP_LTRACE_ERR_RET(inp, NULL, NULL, SCTP_FROM_SCTP6_USRREQ, EINVAL); 1018 return (EINVAL); 1019 } 1020 if (IN6_IS_ADDR_V4MAPPED(&sin6->sin6_addr)) { 1021 SCTP_INP_RUNLOCK(inp); 1022 SCTP_ASOC_CREATE_UNLOCK(inp); 1023 SCTP_LTRACE_ERR_RET(inp, NULL, NULL, SCTP_FROM_SCTP6_USRREQ, EINVAL); 1024 return (EINVAL); 1025 } 1026 } 1027 if (IN6_IS_ADDR_V4MAPPED(&sin6->sin6_addr)) { 1028 if (!MODULE_GLOBAL(ip6_v6only)) { 1029 /* convert v4-mapped into v4 addr */ 1030 in6_sin6_2_sin((struct sockaddr_in *)&ss, sin6); 1031 addr = (struct sockaddr *)&ss; 1032 } else { 1033 /* mapped addresses aren't enabled */ 1034 SCTP_INP_RUNLOCK(inp); 1035 SCTP_ASOC_CREATE_UNLOCK(inp); 1036 SCTP_LTRACE_ERR_RET(inp, NULL, NULL, SCTP_FROM_SCTP6_USRREQ, EINVAL); 1037 return (EINVAL); 1038 } 1039 } 1040#endif /* INET */ 1041 /* Now do we connect? */ 1042 if (inp->sctp_flags & SCTP_PCB_FLAGS_CONNECTED) { 1043 stcb = LIST_FIRST(&inp->sctp_asoc_list); 1044 if (stcb) { 1045 SCTP_TCB_UNLOCK(stcb); 1046 } 1047 SCTP_INP_RUNLOCK(inp); 1048 } else { 1049 SCTP_INP_RUNLOCK(inp); 1050 SCTP_INP_WLOCK(inp); 1051 SCTP_INP_INCR_REF(inp); 1052 SCTP_INP_WUNLOCK(inp); 1053 stcb = sctp_findassociation_ep_addr(&inp, addr, NULL, NULL, NULL); 1054 if (stcb == NULL) { 1055 SCTP_INP_WLOCK(inp); 1056 SCTP_INP_DECR_REF(inp); 1057 SCTP_INP_WUNLOCK(inp); 1058 } 1059 } 1060 1061 if (stcb != NULL) { 1062 /* Already have or am bring up an association */ 1063 SCTP_ASOC_CREATE_UNLOCK(inp); 1064 SCTP_TCB_UNLOCK(stcb); 1065 SCTP_LTRACE_ERR_RET(inp, NULL, NULL, SCTP_FROM_SCTP6_USRREQ, EALREADY); 1066 return (EALREADY); 1067 } 1068 /* We are GOOD to go */ 1069 stcb = sctp_aloc_assoc(inp, addr, &error, 0, vrf_id, p); 1070 SCTP_ASOC_CREATE_UNLOCK(inp); 1071 if (stcb == NULL) { 1072 /* Gak! no memory */ 1073 return (error); 1074 } 1075 if (stcb->sctp_ep->sctp_flags & SCTP_PCB_FLAGS_TCPTYPE) { 1076 stcb->sctp_ep->sctp_flags |= SCTP_PCB_FLAGS_CONNECTED; 1077 /* Set the connected flag so we can queue data */ 1078 soisconnecting(so); 1079 } 1080 stcb->asoc.state = SCTP_STATE_COOKIE_WAIT; 1081 (void)SCTP_GETTIME_TIMEVAL(&stcb->asoc.time_entered); 1082 1083 /* initialize authentication parameters for the assoc */ 1084 sctp_initialize_auth_params(inp, stcb); 1085 1086 sctp_send_initiate(inp, stcb, SCTP_SO_LOCKED); 1087 SCTP_TCB_UNLOCK(stcb); 1088 return (error); 1089} 1090 1091static int 1092sctp6_getaddr(struct socket *so, struct sockaddr **addr) 1093{ 1094 struct sockaddr_in6 *sin6; 1095 struct sctp_inpcb *inp; 1096 uint32_t vrf_id; 1097 struct sctp_ifa *sctp_ifa; 1098 1099 int error; 1100 1101 /* 1102 * Do the malloc first in case it blocks. 1103 */ 1104 SCTP_MALLOC_SONAME(sin6, struct sockaddr_in6 *, sizeof(*sin6)); 1105 if (sin6 == NULL) 1106 return (ENOMEM); 1107 sin6->sin6_family = AF_INET6; 1108 sin6->sin6_len = sizeof(*sin6); 1109 1110 inp = (struct sctp_inpcb *)so->so_pcb; 1111 if (inp == NULL) { 1112 SCTP_FREE_SONAME(sin6); 1113 SCTP_LTRACE_ERR_RET(inp, NULL, NULL, SCTP_FROM_SCTP6_USRREQ, ECONNRESET); 1114 return (ECONNRESET); 1115 } 1116 SCTP_INP_RLOCK(inp); 1117 sin6->sin6_port = inp->sctp_lport; 1118 if (inp->sctp_flags & SCTP_PCB_FLAGS_BOUNDALL) { 1119 /* For the bound all case you get back 0 */ 1120 if (inp->sctp_flags & SCTP_PCB_FLAGS_CONNECTED) { 1121 struct sctp_tcb *stcb; 1122 struct sockaddr_in6 *sin_a6; 1123 struct sctp_nets *net; 1124 int fnd; 1125 1126 stcb = LIST_FIRST(&inp->sctp_asoc_list); 1127 if (stcb == NULL) { 1128 goto notConn6; 1129 } 1130 fnd = 0; 1131 sin_a6 = NULL; 1132 TAILQ_FOREACH(net, &stcb->asoc.nets, sctp_next) { 1133 sin_a6 = (struct sockaddr_in6 *)&net->ro._l_addr; 1134 if (sin_a6 == NULL) 1135 /* this will make coverity happy */ 1136 continue; 1137 1138 if (sin_a6->sin6_family == AF_INET6) { 1139 fnd = 1; 1140 break; 1141 } 1142 } 1143 if ((!fnd) || (sin_a6 == NULL)) { 1144 /* punt */ 1145 goto notConn6; 1146 } 1147 vrf_id = inp->def_vrf_id; 1148 sctp_ifa = sctp_source_address_selection(inp, stcb, (sctp_route_t *) & net->ro, net, 0, vrf_id); 1149 if (sctp_ifa) { 1150 sin6->sin6_addr = sctp_ifa->address.sin6.sin6_addr; 1151 } 1152 } else { 1153 /* For the bound all case you get back 0 */ 1154 notConn6: 1155 memset(&sin6->sin6_addr, 0, sizeof(sin6->sin6_addr)); 1156 } 1157 } else { 1158 /* Take the first IPv6 address in the list */ 1159 struct sctp_laddr *laddr; 1160 int fnd = 0; 1161 1162 LIST_FOREACH(laddr, &inp->sctp_addr_list, sctp_nxt_addr) { 1163 if (laddr->ifa->address.sa.sa_family == AF_INET6) { 1164 struct sockaddr_in6 *sin_a; 1165 1166 sin_a = (struct sockaddr_in6 *)&laddr->ifa->address.sin6; 1167 sin6->sin6_addr = sin_a->sin6_addr; 1168 fnd = 1; 1169 break; 1170 } 1171 } 1172 if (!fnd) { 1173 SCTP_FREE_SONAME(sin6); 1174 SCTP_INP_RUNLOCK(inp); 1175 SCTP_LTRACE_ERR_RET(inp, NULL, NULL, SCTP_FROM_SCTP6_USRREQ, ENOENT); 1176 return (ENOENT); 1177 } 1178 } 1179 SCTP_INP_RUNLOCK(inp); 1180 /* Scoping things for v6 */ 1181 if ((error = sa6_recoverscope(sin6)) != 0) { 1182 SCTP_FREE_SONAME(sin6); 1183 return (error); 1184 } 1185 (*addr) = (struct sockaddr *)sin6; 1186 return (0); 1187} 1188 1189static int 1190sctp6_peeraddr(struct socket *so, struct sockaddr **addr) 1191{ 1192 struct sockaddr_in6 *sin6; 1193 int fnd; 1194 struct sockaddr_in6 *sin_a6; 1195 struct sctp_inpcb *inp; 1196 struct sctp_tcb *stcb; 1197 struct sctp_nets *net; 1198 int error; 1199 1200 /* Do the malloc first in case it blocks. */ 1201 SCTP_MALLOC_SONAME(sin6, struct sockaddr_in6 *, sizeof *sin6); 1202 if (sin6 == NULL) 1203 return (ENOMEM); 1204 sin6->sin6_family = AF_INET6; 1205 sin6->sin6_len = sizeof(*sin6); 1206 1207 inp = (struct sctp_inpcb *)so->so_pcb; 1208 if ((inp == NULL) || 1209 ((inp->sctp_flags & SCTP_PCB_FLAGS_CONNECTED) == 0)) { 1210 /* UDP type and listeners will drop out here */ 1211 SCTP_FREE_SONAME(sin6); 1212 SCTP_LTRACE_ERR_RET(inp, NULL, NULL, SCTP_FROM_SCTP6_USRREQ, ENOTCONN); 1213 return (ENOTCONN); 1214 } 1215 SCTP_INP_RLOCK(inp); 1216 stcb = LIST_FIRST(&inp->sctp_asoc_list); 1217 if (stcb) { 1218 SCTP_TCB_LOCK(stcb); 1219 } 1220 SCTP_INP_RUNLOCK(inp); 1221 if (stcb == NULL) { 1222 SCTP_FREE_SONAME(sin6); 1223 SCTP_LTRACE_ERR_RET(inp, NULL, NULL, SCTP_FROM_SCTP6_USRREQ, ECONNRESET); 1224 return (ECONNRESET); 1225 } 1226 fnd = 0; 1227 TAILQ_FOREACH(net, &stcb->asoc.nets, sctp_next) { 1228 sin_a6 = (struct sockaddr_in6 *)&net->ro._l_addr; 1229 if (sin_a6->sin6_family == AF_INET6) { 1230 fnd = 1; 1231 sin6->sin6_port = stcb->rport; 1232 sin6->sin6_addr = sin_a6->sin6_addr; 1233 break; 1234 } 1235 } 1236 SCTP_TCB_UNLOCK(stcb); 1237 if (!fnd) { 1238 /* No IPv4 address */ 1239 SCTP_FREE_SONAME(sin6); 1240 SCTP_LTRACE_ERR_RET(inp, NULL, NULL, SCTP_FROM_SCTP6_USRREQ, ENOENT); 1241 return (ENOENT); 1242 } 1243 if ((error = sa6_recoverscope(sin6)) != 0) 1244 return (error); 1245 *addr = (struct sockaddr *)sin6; 1246 return (0); 1247} 1248 1249static int 1250sctp6_in6getaddr(struct socket *so, struct sockaddr **nam) 1251{ 1252#ifdef INET 1253 struct sockaddr *addr; 1254 1255#endif 1256 struct in6pcb *inp6 = sotoin6pcb(so); 1257 int error; 1258 1259 if (inp6 == NULL) { 1260 SCTP_LTRACE_ERR_RET(NULL, NULL, NULL, SCTP_FROM_SCTP6_USRREQ, EINVAL); 1261 return (EINVAL); 1262 } 1263 /* allow v6 addresses precedence */ 1264 error = sctp6_getaddr(so, nam); 1265#ifdef INET 1266 if (error) { 1267 /* try v4 next if v6 failed */ 1268 error = sctp_ingetaddr(so, nam); 1269 if (error) { 1270 return (error); 1271 } 1272 addr = *nam; 1273 /* if I'm V6ONLY, convert it to v4-mapped */ 1274 if (SCTP_IPV6_V6ONLY(inp6)) { 1275 struct sockaddr_in6 sin6; 1276 1277 in6_sin_2_v4mapsin6((struct sockaddr_in *)addr, &sin6); 1278 memcpy(addr, &sin6, sizeof(struct sockaddr_in6)); 1279 } 1280 } 1281#endif 1282 return (error); 1283} 1284 1285 1286static int 1287sctp6_getpeeraddr(struct socket *so, struct sockaddr **nam) 1288{ 1289#ifdef INET 1290 struct sockaddr *addr; 1291 1292#endif 1293 struct in6pcb *inp6 = sotoin6pcb(so); 1294 int error; 1295 1296 if (inp6 == NULL) { 1297 SCTP_LTRACE_ERR_RET(NULL, NULL, NULL, SCTP_FROM_SCTP6_USRREQ, EINVAL); 1298 return (EINVAL); 1299 } 1300 /* allow v6 addresses precedence */ 1301 error = sctp6_peeraddr(so, nam); 1302#ifdef INET 1303 if (error) { 1304 /* try v4 next if v6 failed */ 1305 error = sctp_peeraddr(so, nam); 1306 if (error) { 1307 return (error); 1308 } 1309 addr = *nam; 1310 /* if I'm V6ONLY, convert it to v4-mapped */ 1311 if (SCTP_IPV6_V6ONLY(inp6)) { 1312 struct sockaddr_in6 sin6; 1313 1314 in6_sin_2_v4mapsin6((struct sockaddr_in *)addr, &sin6); 1315 memcpy(addr, &sin6, sizeof(struct sockaddr_in6)); 1316 } 1317 } 1318#endif 1319 return (error); 1320} 1321 1322struct pr_usrreqs sctp6_usrreqs = { 1323 .pru_abort = sctp6_abort, 1324 .pru_accept = sctp_accept, 1325 .pru_attach = sctp6_attach, 1326 .pru_bind = sctp6_bind, 1327 .pru_connect = sctp6_connect, 1328 .pru_control = in6_control, 1329 .pru_close = sctp6_close, 1330 .pru_detach = sctp6_close, 1331 .pru_sopoll = sopoll_generic, 1332 .pru_flush = sctp_flush, 1333 .pru_disconnect = sctp6_disconnect, 1334 .pru_listen = sctp_listen, 1335 .pru_peeraddr = sctp6_getpeeraddr, 1336 .pru_send = sctp6_send, 1337 .pru_shutdown = sctp_shutdown, 1338 .pru_sockaddr = sctp6_in6getaddr, 1339 .pru_sosend = sctp_sosend, 1340 .pru_soreceive = sctp_soreceive 1341}; 1342