sctp6_usrreq.c revision 188067
1/*- 2 * Copyright (c) 2001-2007, by Cisco Systems, Inc. All rights reserved. 3 * 4 * Redistribution and use in source and binary forms, with or without 5 * modification, are permitted provided that the following conditions are met: 6 * 7 * a) Redistributions of source code must retain the above copyright notice, 8 * this list of conditions and the following disclaimer. 9 * 10 * b) Redistributions in binary form must reproduce the above copyright 11 * notice, this list of conditions and the following disclaimer in 12 * the documentation and/or other materials provided with the distribution. 13 * 14 * c) Neither the name of Cisco Systems, Inc. nor the names of its 15 * contributors may be used to endorse or promote products derived 16 * from this software without specific prior written permission. 17 * 18 * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS 19 * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, 20 * THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 21 * ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR CONTRIBUTORS BE 22 * LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR 23 * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF 24 * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS 25 * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN 26 * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) 27 * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF 28 * THE POSSIBILITY OF SUCH DAMAGE. 29 */ 30/* $KAME: sctp6_usrreq.c,v 1.38 2005/08/24 08:08:56 suz Exp $ */ 31 32#include <sys/cdefs.h> 33__FBSDID("$FreeBSD: head/sys/netinet6/sctp6_usrreq.c 188067 2009-02-03 11:04:03Z rrs $"); 34 35#include <netinet/sctp_os.h> 36#include <sys/proc.h> 37#include <netinet/sctp_pcb.h> 38#include <netinet/sctp_header.h> 39#include <netinet/sctp_var.h> 40#if defined(INET6) 41#include <netinet6/sctp6_var.h> 42#endif 43#include <netinet/sctp_sysctl.h> 44#include <netinet/sctp_output.h> 45#include <netinet/sctp_uio.h> 46#include <netinet/sctp_asconf.h> 47#include <netinet/sctputil.h> 48#include <netinet/sctp_indata.h> 49#include <netinet/sctp_timer.h> 50#include <netinet/sctp_auth.h> 51#include <netinet/sctp_input.h> 52#include <netinet/sctp_output.h> 53#include <netinet/sctp_bsd_addr.h> 54#include <netinet/sctp_crc32.h> 55#include <netinet/udp.h> 56 57#ifdef IPSEC 58#include <netipsec/ipsec.h> 59#if defined(INET6) 60#include <netipsec/ipsec6.h> 61#endif /* INET6 */ 62#endif /* IPSEC */ 63 64extern struct protosw inetsw[]; 65 66int 67sctp6_input(struct mbuf **i_pak, int *offp, int proto) 68{ 69 struct mbuf *m; 70 struct ip6_hdr *ip6; 71 struct sctphdr *sh; 72 struct sctp_inpcb *in6p = NULL; 73 struct sctp_nets *net; 74 int refcount_up = 0; 75 uint32_t check, calc_check; 76 uint32_t vrf_id = 0; 77 struct inpcb *in6p_ip; 78 struct sctp_chunkhdr *ch; 79 int length, offset, iphlen; 80 uint8_t ecn_bits; 81 struct sctp_tcb *stcb = NULL; 82 int pkt_len = 0; 83 int off = *offp; 84 uint16_t port = 0; 85 86 /* get the VRF and table id's */ 87 if (SCTP_GET_PKT_VRFID(*i_pak, vrf_id)) { 88 SCTP_RELEASE_PKT(*i_pak); 89 return (-1); 90 } 91 m = SCTP_HEADER_TO_CHAIN(*i_pak); 92 pkt_len = SCTP_HEADER_LEN((*i_pak)); 93 94#ifdef SCTP_PACKET_LOGGING 95 sctp_packet_log(m, pkt_len); 96#endif 97 ip6 = mtod(m, struct ip6_hdr *); 98 /* Ensure that (sctphdr + sctp_chunkhdr) in a row. */ 99 IP6_EXTHDR_GET(sh, struct sctphdr *, m, off, 100 (int)(sizeof(*sh) + sizeof(*ch))); 101 if (sh == NULL) { 102 SCTP_STAT_INCR(sctps_hdrops); 103 return IPPROTO_DONE; 104 } 105 ch = (struct sctp_chunkhdr *)((caddr_t)sh + sizeof(struct sctphdr)); 106 iphlen = off; 107 offset = iphlen + sizeof(*sh) + sizeof(*ch); 108 SCTPDBG(SCTP_DEBUG_INPUT1, 109 "sctp6_input() length:%d iphlen:%d\n", pkt_len, iphlen); 110 111 112#if defined(NFAITH) && NFAITH > 0 113 114 if (faithprefix_p != NULL && (*faithprefix_p) (&ip6->ip6_dst)) { 115 /* XXX send icmp6 host/port unreach? */ 116 goto bad; 117 } 118#endif /* NFAITH defined and > 0 */ 119 SCTP_STAT_INCR(sctps_recvpackets); 120 SCTP_STAT_INCR_COUNTER64(sctps_inpackets); 121 SCTPDBG(SCTP_DEBUG_INPUT1, "V6 input gets a packet iphlen:%d pktlen:%d\n", 122 iphlen, pkt_len); 123 if (IN6_IS_ADDR_MULTICAST(&ip6->ip6_dst)) { 124 /* No multi-cast support in SCTP */ 125 goto bad; 126 } 127 /* destination port of 0 is illegal, based on RFC2960. */ 128 if (sh->dest_port == 0) 129 goto bad; 130 131 SCTPDBG(SCTP_DEBUG_CRCOFFLOAD, 132 "sctp_input(): Packet of length %d received on %s with csum_flags 0x%x.\n", 133 m->m_pkthdr.len, 134 if_name(m->m_pkthdr.rcvif), 135 m->m_pkthdr.csum_flags); 136 if (m->m_pkthdr.csum_flags & CSUM_SCTP_VALID) { 137 SCTP_STAT_INCR(sctps_recvhwcrc); 138 goto sctp_skip_csum; 139 } 140 check = sh->checksum; /* save incoming checksum */ 141 if ((check == 0) && (SCTP_BASE_SYSCTL(sctp_no_csum_on_loopback)) && 142 (IN6_ARE_ADDR_EQUAL(&ip6->ip6_src, &ip6->ip6_dst))) { 143 SCTP_STAT_INCR(sctps_recvnocrc); 144 goto sctp_skip_csum; 145 } 146 sh->checksum = 0; /* prepare for calc */ 147 calc_check = sctp_calculate_cksum(m, iphlen); 148 SCTP_STAT_INCR(sctps_recvswcrc); 149 if (calc_check != check) { 150 SCTPDBG(SCTP_DEBUG_INPUT1, "Bad CSUM on SCTP packet calc_check:%x check:%x m:%p phlen:%d\n", 151 calc_check, check, m, iphlen); 152 stcb = sctp_findassociation_addr(m, iphlen, offset - sizeof(*ch), 153 sh, ch, &in6p, &net, vrf_id); 154 if ((net) && (port)) { 155 if (net->port == 0) { 156 sctp_pathmtu_adjustment(in6p, stcb, net, net->mtu - sizeof(struct udphdr)); 157 } 158 net->port = port; 159 } 160 /* in6p's ref-count increased && stcb locked */ 161 if ((in6p) && (stcb)) { 162 sctp_send_packet_dropped(stcb, net, m, iphlen, 1); 163 sctp_chunk_output((struct sctp_inpcb *)in6p, stcb, SCTP_OUTPUT_FROM_INPUT_ERROR, SCTP_SO_NOT_LOCKED); 164 } else if ((in6p != NULL) && (stcb == NULL)) { 165 refcount_up = 1; 166 } 167 SCTP_STAT_INCR(sctps_badsum); 168 SCTP_STAT_INCR_COUNTER32(sctps_checksumerrors); 169 goto bad; 170 } 171 sh->checksum = calc_check; 172 173sctp_skip_csum: 174 net = NULL; 175 /* 176 * Locate pcb and tcb for datagram sctp_findassociation_addr() wants 177 * IP/SCTP/first chunk header... 178 */ 179 stcb = sctp_findassociation_addr(m, iphlen, offset - sizeof(*ch), 180 sh, ch, &in6p, &net, vrf_id); 181 if ((net) && (port)) { 182 if (net->port == 0) { 183 sctp_pathmtu_adjustment(in6p, stcb, net, net->mtu - sizeof(struct udphdr)); 184 } 185 net->port = port; 186 } 187 /* in6p's ref-count increased */ 188 if (in6p == NULL) { 189 struct sctp_init_chunk *init_chk, chunk_buf; 190 191 SCTP_STAT_INCR(sctps_noport); 192 if (ch->chunk_type == SCTP_INITIATION) { 193 /* 194 * we do a trick here to get the INIT tag, dig in 195 * and get the tag from the INIT and put it in the 196 * common header. 197 */ 198 init_chk = (struct sctp_init_chunk *)sctp_m_getptr(m, 199 iphlen + sizeof(*sh), sizeof(*init_chk), 200 (uint8_t *) & chunk_buf); 201 if (init_chk) 202 sh->v_tag = init_chk->init.initiate_tag; 203 else 204 sh->v_tag = 0; 205 } 206 if (ch->chunk_type == SCTP_SHUTDOWN_ACK) { 207 sctp_send_shutdown_complete2(m, iphlen, sh, vrf_id, port); 208 goto bad; 209 } 210 if (ch->chunk_type == SCTP_SHUTDOWN_COMPLETE) { 211 goto bad; 212 } 213 if (ch->chunk_type != SCTP_ABORT_ASSOCIATION) 214 sctp_send_abort(m, iphlen, sh, 0, NULL, vrf_id, port); 215 goto bad; 216 } else if (stcb == NULL) { 217 refcount_up = 1; 218 } 219 in6p_ip = (struct inpcb *)in6p; 220#ifdef IPSEC 221 /* 222 * Check AH/ESP integrity. 223 */ 224 if (in6p_ip && (ipsec6_in_reject(m, in6p_ip))) { 225/* XXX */ 226 MODULE_GLOBAL(MOD_IPSEC, ipsec6stat).in_polvio++; 227 goto bad; 228 } 229#endif /* IPSEC */ 230 231 /* 232 * CONTROL chunk processing 233 */ 234 offset -= sizeof(*ch); 235 ecn_bits = ((ntohl(ip6->ip6_flow) >> 20) & 0x000000ff); 236 237 /* Length now holds the total packet length payload + iphlen */ 238 length = ntohs(ip6->ip6_plen) + iphlen; 239 240 /* sa_ignore NO_NULL_CHK */ 241 sctp_common_input_processing(&m, iphlen, offset, length, sh, ch, 242 in6p, stcb, net, ecn_bits, vrf_id, port); 243 /* inp's ref-count reduced && stcb unlocked */ 244 /* XXX this stuff below gets moved to appropriate parts later... */ 245 if (m) 246 sctp_m_freem(m); 247 if ((in6p) && refcount_up) { 248 /* reduce ref-count */ 249 SCTP_INP_WLOCK(in6p); 250 SCTP_INP_DECR_REF(in6p); 251 SCTP_INP_WUNLOCK(in6p); 252 } 253 return IPPROTO_DONE; 254 255bad: 256 if (stcb) { 257 SCTP_TCB_UNLOCK(stcb); 258 } 259 if ((in6p) && refcount_up) { 260 /* reduce ref-count */ 261 SCTP_INP_WLOCK(in6p); 262 SCTP_INP_DECR_REF(in6p); 263 SCTP_INP_WUNLOCK(in6p); 264 } 265 if (m) 266 sctp_m_freem(m); 267 return IPPROTO_DONE; 268} 269 270 271static void 272sctp6_notify_mbuf(struct sctp_inpcb *inp, struct icmp6_hdr *icmp6, 273 struct sctphdr *sh, struct sctp_tcb *stcb, struct sctp_nets *net) 274{ 275 uint32_t nxtsz; 276 277 if ((inp == NULL) || (stcb == NULL) || (net == NULL) || 278 (icmp6 == NULL) || (sh == NULL)) { 279 goto out; 280 } 281 /* First do we even look at it? */ 282 if (ntohl(sh->v_tag) != (stcb->asoc.peer_vtag)) 283 goto out; 284 285 if (icmp6->icmp6_type != ICMP6_PACKET_TOO_BIG) { 286 /* not PACKET TO BIG */ 287 goto out; 288 } 289 /* 290 * ok we need to look closely. We could even get smarter and look at 291 * anyone that we sent to in case we get a different ICMP that tells 292 * us there is no way to reach a host, but for this impl, all we 293 * care about is MTU discovery. 294 */ 295 nxtsz = ntohl(icmp6->icmp6_mtu); 296 /* Stop any PMTU timer */ 297 sctp_timer_stop(SCTP_TIMER_TYPE_PATHMTURAISE, inp, stcb, NULL, SCTP_FROM_SCTP6_USRREQ + SCTP_LOC_1); 298 299 /* Adjust destination size limit */ 300 if (net->mtu > nxtsz) { 301 net->mtu = nxtsz; 302 if (net->port) { 303 net->mtu -= sizeof(struct udphdr); 304 } 305 } 306 /* now what about the ep? */ 307 if (stcb->asoc.smallest_mtu > nxtsz) { 308 struct sctp_tmit_chunk *chk; 309 310 /* Adjust that too */ 311 stcb->asoc.smallest_mtu = nxtsz; 312 /* now off to subtract IP_DF flag if needed */ 313 314 TAILQ_FOREACH(chk, &stcb->asoc.send_queue, sctp_next) { 315 if ((uint32_t) (chk->send_size + IP_HDR_SIZE) > nxtsz) { 316 chk->flags |= CHUNK_FLAGS_FRAGMENT_OK; 317 } 318 } 319 TAILQ_FOREACH(chk, &stcb->asoc.sent_queue, sctp_next) { 320 if ((uint32_t) (chk->send_size + IP_HDR_SIZE) > nxtsz) { 321 /* 322 * For this guy we also mark for immediate 323 * resend since we sent to big of chunk 324 */ 325 chk->flags |= CHUNK_FLAGS_FRAGMENT_OK; 326 if (chk->sent != SCTP_DATAGRAM_RESEND) 327 stcb->asoc.sent_queue_retran_cnt++; 328 chk->sent = SCTP_DATAGRAM_RESEND; 329 chk->rec.data.doing_fast_retransmit = 0; 330 331 chk->sent = SCTP_DATAGRAM_RESEND; 332 /* Clear any time so NO RTT is being done */ 333 chk->sent_rcv_time.tv_sec = 0; 334 chk->sent_rcv_time.tv_usec = 0; 335 stcb->asoc.total_flight -= chk->send_size; 336 net->flight_size -= chk->send_size; 337 } 338 } 339 } 340 sctp_timer_start(SCTP_TIMER_TYPE_PATHMTURAISE, inp, stcb, NULL); 341out: 342 if (stcb) { 343 SCTP_TCB_UNLOCK(stcb); 344 } 345} 346 347 348void 349sctp6_notify(struct sctp_inpcb *inp, 350 struct icmp6_hdr *icmph, 351 struct sctphdr *sh, 352 struct sockaddr *to, 353 struct sctp_tcb *stcb, 354 struct sctp_nets *net) 355{ 356#if defined (__APPLE__) || defined(SCTP_SO_LOCK_TESTING) 357 struct socket *so; 358 359#endif 360 /* protection */ 361 int reason; 362 363 364 if ((inp == NULL) || (stcb == NULL) || (net == NULL) || 365 (sh == NULL) || (to == NULL)) { 366 if (stcb) 367 SCTP_TCB_UNLOCK(stcb); 368 return; 369 } 370 /* First job is to verify the vtag matches what I would send */ 371 if (ntohl(sh->v_tag) != (stcb->asoc.peer_vtag)) { 372 SCTP_TCB_UNLOCK(stcb); 373 return; 374 } 375 if (icmph->icmp6_type != ICMP_UNREACH) { 376 /* We only care about unreachable */ 377 SCTP_TCB_UNLOCK(stcb); 378 return; 379 } 380 if ((icmph->icmp6_code == ICMP_UNREACH_NET) || 381 (icmph->icmp6_code == ICMP_UNREACH_HOST) || 382 (icmph->icmp6_code == ICMP_UNREACH_NET_UNKNOWN) || 383 (icmph->icmp6_code == ICMP_UNREACH_HOST_UNKNOWN) || 384 (icmph->icmp6_code == ICMP_UNREACH_ISOLATED) || 385 (icmph->icmp6_code == ICMP_UNREACH_NET_PROHIB) || 386 (icmph->icmp6_code == ICMP_UNREACH_HOST_PROHIB) || 387 (icmph->icmp6_code == ICMP_UNREACH_FILTER_PROHIB)) { 388 389 /* 390 * Hmm reachablity problems we must examine closely. If its 391 * not reachable, we may have lost a network. Or if there is 392 * NO protocol at the other end named SCTP. well we consider 393 * it a OOTB abort. 394 */ 395 if (net->dest_state & SCTP_ADDR_REACHABLE) { 396 /* Ok that destination is NOT reachable */ 397 SCTP_PRINTF("ICMP (thresh %d/%d) takes interface %p down\n", 398 net->error_count, 399 net->failure_threshold, 400 net); 401 402 net->dest_state &= ~SCTP_ADDR_REACHABLE; 403 net->dest_state |= SCTP_ADDR_NOT_REACHABLE; 404 /* 405 * JRS 5/14/07 - If a destination is unreachable, 406 * the PF bit is turned off. This allows an 407 * unambiguous use of the PF bit for destinations 408 * that are reachable but potentially failed. If the 409 * destination is set to the unreachable state, also 410 * set the destination to the PF state. 411 */ 412 /* 413 * Add debug message here if destination is not in 414 * PF state. 415 */ 416 /* Stop any running T3 timers here? */ 417 if (SCTP_BASE_SYSCTL(sctp_cmt_on_off) && SCTP_BASE_SYSCTL(sctp_cmt_pf)) { 418 net->dest_state &= ~SCTP_ADDR_PF; 419 SCTPDBG(SCTP_DEBUG_TIMER4, "Destination %p moved from PF to unreachable.\n", 420 net); 421 } 422 net->error_count = net->failure_threshold + 1; 423 sctp_ulp_notify(SCTP_NOTIFY_INTERFACE_DOWN, 424 stcb, SCTP_FAILED_THRESHOLD, 425 (void *)net, SCTP_SO_NOT_LOCKED); 426 } 427 SCTP_TCB_UNLOCK(stcb); 428 } else if ((icmph->icmp6_code == ICMP_UNREACH_PROTOCOL) || 429 (icmph->icmp6_code == ICMP_UNREACH_PORT)) { 430 /* 431 * Here the peer is either playing tricks on us, including 432 * an address that belongs to someone who does not support 433 * SCTP OR was a userland implementation that shutdown and 434 * now is dead. In either case treat it like a OOTB abort 435 * with no TCB 436 */ 437 reason = SCTP_PEER_FAULTY; 438 sctp_abort_notification(stcb, reason, SCTP_SO_NOT_LOCKED); 439#if defined (__APPLE__) || defined(SCTP_SO_LOCK_TESTING) 440 so = SCTP_INP_SO(inp); 441 atomic_add_int(&stcb->asoc.refcnt, 1); 442 SCTP_TCB_UNLOCK(stcb); 443 SCTP_SOCKET_LOCK(so, 1); 444 SCTP_TCB_LOCK(stcb); 445 atomic_subtract_int(&stcb->asoc.refcnt, 1); 446#endif 447 (void)sctp_free_assoc(inp, stcb, SCTP_NORMAL_PROC, SCTP_FROM_SCTP_USRREQ + SCTP_LOC_2); 448#if defined (__APPLE__) || defined(SCTP_SO_LOCK_TESTING) 449 SCTP_SOCKET_UNLOCK(so, 1); 450 /* SCTP_TCB_UNLOCK(stcb); MT: I think this is not needed. */ 451#endif 452 /* no need to unlock here, since the TCB is gone */ 453 } else { 454 SCTP_TCB_UNLOCK(stcb); 455 } 456} 457 458 459 460void 461sctp6_ctlinput(int cmd, struct sockaddr *pktdst, void *d) 462{ 463 struct sctphdr sh; 464 struct ip6ctlparam *ip6cp = NULL; 465 uint32_t vrf_id; 466 467 vrf_id = SCTP_DEFAULT_VRFID; 468 469 if (pktdst->sa_family != AF_INET6 || 470 pktdst->sa_len != sizeof(struct sockaddr_in6)) 471 return; 472 473 if ((unsigned)cmd >= PRC_NCMDS) 474 return; 475 if (PRC_IS_REDIRECT(cmd)) { 476 d = NULL; 477 } else if (inet6ctlerrmap[cmd] == 0) { 478 return; 479 } 480 /* if the parameter is from icmp6, decode it. */ 481 if (d != NULL) { 482 ip6cp = (struct ip6ctlparam *)d; 483 } else { 484 ip6cp = (struct ip6ctlparam *)NULL; 485 } 486 487 if (ip6cp) { 488 /* 489 * XXX: We assume that when IPV6 is non NULL, M and OFF are 490 * valid. 491 */ 492 /* check if we can safely examine src and dst ports */ 493 struct sctp_inpcb *inp = NULL; 494 struct sctp_tcb *stcb = NULL; 495 struct sctp_nets *net = NULL; 496 struct sockaddr_in6 final; 497 498 if (ip6cp->ip6c_m == NULL) 499 return; 500 501 bzero(&sh, sizeof(sh)); 502 bzero(&final, sizeof(final)); 503 inp = NULL; 504 net = NULL; 505 m_copydata(ip6cp->ip6c_m, ip6cp->ip6c_off, sizeof(sh), 506 (caddr_t)&sh); 507 ip6cp->ip6c_src->sin6_port = sh.src_port; 508 final.sin6_len = sizeof(final); 509 final.sin6_family = AF_INET6; 510 final.sin6_addr = ((struct sockaddr_in6 *)pktdst)->sin6_addr; 511 final.sin6_port = sh.dest_port; 512 stcb = sctp_findassociation_addr_sa((struct sockaddr *)ip6cp->ip6c_src, 513 (struct sockaddr *)&final, 514 &inp, &net, 1, vrf_id); 515 /* inp's ref-count increased && stcb locked */ 516 if (stcb != NULL && inp && (inp->sctp_socket != NULL)) { 517 if (cmd == PRC_MSGSIZE) { 518 sctp6_notify_mbuf(inp, 519 ip6cp->ip6c_icmp6, 520 &sh, 521 stcb, 522 net); 523 /* inp's ref-count reduced && stcb unlocked */ 524 } else { 525 sctp6_notify(inp, ip6cp->ip6c_icmp6, &sh, 526 (struct sockaddr *)&final, 527 stcb, net); 528 /* inp's ref-count reduced && stcb unlocked */ 529 } 530 } else { 531 if (PRC_IS_REDIRECT(cmd) && inp) { 532 in6_rtchange((struct in6pcb *)inp, 533 inet6ctlerrmap[cmd]); 534 } 535 if (inp) { 536 /* reduce inp's ref-count */ 537 SCTP_INP_WLOCK(inp); 538 SCTP_INP_DECR_REF(inp); 539 SCTP_INP_WUNLOCK(inp); 540 } 541 if (stcb) 542 SCTP_TCB_UNLOCK(stcb); 543 } 544 } 545} 546 547/* 548 * this routine can probably be collasped into the one in sctp_userreq.c 549 * since they do the same thing and now we lookup with a sockaddr 550 */ 551static int 552sctp6_getcred(SYSCTL_HANDLER_ARGS) 553{ 554 struct xucred xuc; 555 struct sockaddr_in6 addrs[2]; 556 struct sctp_inpcb *inp; 557 struct sctp_nets *net; 558 struct sctp_tcb *stcb; 559 int error; 560 uint32_t vrf_id; 561 562 vrf_id = SCTP_DEFAULT_VRFID; 563 564 error = priv_check(req->td, PRIV_NETINET_GETCRED); 565 if (error) 566 return (error); 567 568 if (req->newlen != sizeof(addrs)) { 569 SCTP_LTRACE_ERR_RET(NULL, NULL, NULL, SCTP_FROM_SCTP6_USRREQ, EINVAL); 570 return (EINVAL); 571 } 572 if (req->oldlen != sizeof(struct ucred)) { 573 SCTP_LTRACE_ERR_RET(NULL, NULL, NULL, SCTP_FROM_SCTP6_USRREQ, EINVAL); 574 return (EINVAL); 575 } 576 error = SYSCTL_IN(req, addrs, sizeof(addrs)); 577 if (error) 578 return (error); 579 580 stcb = sctp_findassociation_addr_sa(sin6tosa(&addrs[0]), 581 sin6tosa(&addrs[1]), 582 &inp, &net, 1, vrf_id); 583 if (stcb == NULL || inp == NULL || inp->sctp_socket == NULL) { 584 if ((inp != NULL) && (stcb == NULL)) { 585 /* reduce ref-count */ 586 SCTP_INP_WLOCK(inp); 587 SCTP_INP_DECR_REF(inp); 588 goto cred_can_cont; 589 } 590 SCTP_LTRACE_ERR_RET(inp, NULL, NULL, SCTP_FROM_SCTP6_USRREQ, ENOENT); 591 error = ENOENT; 592 goto out; 593 } 594 SCTP_TCB_UNLOCK(stcb); 595 /* 596 * We use the write lock here, only since in the error leg we need 597 * it. If we used RLOCK, then we would have to 598 * wlock/decr/unlock/rlock. Which in theory could create a hole. 599 * Better to use higher wlock. 600 */ 601 SCTP_INP_WLOCK(inp); 602cred_can_cont: 603 error = cr_canseesocket(req->td->td_ucred, inp->sctp_socket); 604 if (error) { 605 SCTP_INP_WUNLOCK(inp); 606 goto out; 607 } 608 cru2x(inp->sctp_socket->so_cred, &xuc); 609 SCTP_INP_WUNLOCK(inp); 610 error = SYSCTL_OUT(req, &xuc, sizeof(struct xucred)); 611out: 612 return (error); 613} 614 615SYSCTL_PROC(_net_inet6_sctp6, OID_AUTO, getcred, CTLTYPE_OPAQUE | CTLFLAG_RW, 616 0, 0, 617 sctp6_getcred, "S,ucred", "Get the ucred of a SCTP6 connection"); 618 619 620/* This is the same as the sctp_abort() could be made common */ 621static void 622sctp6_abort(struct socket *so) 623{ 624 struct sctp_inpcb *inp; 625 uint32_t flags; 626 627 inp = (struct sctp_inpcb *)so->so_pcb; 628 if (inp == 0) { 629 SCTP_LTRACE_ERR_RET(inp, NULL, NULL, SCTP_FROM_SCTP6_USRREQ, EINVAL); 630 return; 631 } 632sctp_must_try_again: 633 flags = inp->sctp_flags; 634#ifdef SCTP_LOG_CLOSING 635 sctp_log_closing(inp, NULL, 17); 636#endif 637 if (((flags & SCTP_PCB_FLAGS_SOCKET_GONE) == 0) && 638 (atomic_cmpset_int(&inp->sctp_flags, flags, (flags | SCTP_PCB_FLAGS_SOCKET_GONE | SCTP_PCB_FLAGS_CLOSE_IP)))) { 639#ifdef SCTP_LOG_CLOSING 640 sctp_log_closing(inp, NULL, 16); 641#endif 642 sctp_inpcb_free(inp, SCTP_FREE_SHOULD_USE_ABORT, 643 SCTP_CALLED_AFTER_CMPSET_OFCLOSE); 644 SOCK_LOCK(so); 645 SCTP_SB_CLEAR(so->so_snd); 646 /* 647 * same for the rcv ones, they are only here for the 648 * accounting/select. 649 */ 650 SCTP_SB_CLEAR(so->so_rcv); 651 /* Now null out the reference, we are completely detached. */ 652 so->so_pcb = NULL; 653 SOCK_UNLOCK(so); 654 } else { 655 flags = inp->sctp_flags; 656 if ((flags & SCTP_PCB_FLAGS_SOCKET_GONE) == 0) { 657 goto sctp_must_try_again; 658 } 659 } 660 return; 661} 662 663static int 664sctp6_attach(struct socket *so, int proto, struct thread *p) 665{ 666 struct in6pcb *inp6; 667 int error; 668 struct sctp_inpcb *inp; 669 uint32_t vrf_id = SCTP_DEFAULT_VRFID; 670 671 inp = (struct sctp_inpcb *)so->so_pcb; 672 if (inp != NULL) { 673 SCTP_LTRACE_ERR_RET(inp, NULL, NULL, SCTP_FROM_SCTP6_USRREQ, EINVAL); 674 return EINVAL; 675 } 676 if (so->so_snd.sb_hiwat == 0 || so->so_rcv.sb_hiwat == 0) { 677 error = SCTP_SORESERVE(so, SCTP_BASE_SYSCTL(sctp_sendspace), SCTP_BASE_SYSCTL(sctp_recvspace)); 678 if (error) 679 return error; 680 } 681 error = sctp_inpcb_alloc(so, vrf_id); 682 if (error) 683 return error; 684 inp = (struct sctp_inpcb *)so->so_pcb; 685 SCTP_INP_WLOCK(inp); 686 inp->sctp_flags |= SCTP_PCB_FLAGS_BOUND_V6; /* I'm v6! */ 687 inp6 = (struct in6pcb *)inp; 688 689 inp6->inp_vflag |= INP_IPV6; 690 inp6->in6p_hops = -1; /* use kernel default */ 691 inp6->in6p_cksum = -1; /* just to be sure */ 692#ifdef INET 693 /* 694 * XXX: ugly!! IPv4 TTL initialization is necessary for an IPv6 695 * socket as well, because the socket may be bound to an IPv6 696 * wildcard address, which may match an IPv4-mapped IPv6 address. 697 */ 698 inp6->inp_ip_ttl = MODULE_GLOBAL(MOD_INET, ip_defttl); 699#endif 700 /* 701 * Hmm what about the IPSEC stuff that is missing here but in 702 * sctp_attach()? 703 */ 704 SCTP_INP_WUNLOCK(inp); 705 return 0; 706} 707 708static int 709sctp6_bind(struct socket *so, struct sockaddr *addr, struct thread *p) 710{ 711 struct sctp_inpcb *inp; 712 struct in6pcb *inp6; 713 int error; 714 715 inp = (struct sctp_inpcb *)so->so_pcb; 716 if (inp == 0) { 717 SCTP_LTRACE_ERR_RET(inp, NULL, NULL, SCTP_FROM_SCTP6_USRREQ, EINVAL); 718 return EINVAL; 719 } 720 if (addr) { 721 if ((addr->sa_family == AF_INET6) && 722 (addr->sa_len != sizeof(struct sockaddr_in6))) { 723 SCTP_LTRACE_ERR_RET(inp, NULL, NULL, SCTP_FROM_SCTP6_USRREQ, EINVAL); 724 return EINVAL; 725 } 726 if ((addr->sa_family == AF_INET) && 727 (addr->sa_len != sizeof(struct sockaddr_in))) { 728 SCTP_LTRACE_ERR_RET(inp, NULL, NULL, SCTP_FROM_SCTP6_USRREQ, EINVAL); 729 return EINVAL; 730 } 731 } 732 inp6 = (struct in6pcb *)inp; 733 inp6->inp_vflag &= ~INP_IPV4; 734 inp6->inp_vflag |= INP_IPV6; 735 if ((addr != NULL) && (SCTP_IPV6_V6ONLY(inp6) == 0)) { 736 if (addr->sa_family == AF_INET) { 737 /* binding v4 addr to v6 socket, so reset flags */ 738 inp6->inp_vflag |= INP_IPV4; 739 inp6->inp_vflag &= ~INP_IPV6; 740 } else { 741 struct sockaddr_in6 *sin6_p; 742 743 sin6_p = (struct sockaddr_in6 *)addr; 744 745 if (IN6_IS_ADDR_UNSPECIFIED(&sin6_p->sin6_addr)) { 746 inp6->inp_vflag |= INP_IPV4; 747 } else if (IN6_IS_ADDR_V4MAPPED(&sin6_p->sin6_addr)) { 748 struct sockaddr_in sin; 749 750 in6_sin6_2_sin(&sin, sin6_p); 751 inp6->inp_vflag |= INP_IPV4; 752 inp6->inp_vflag &= ~INP_IPV6; 753 error = sctp_inpcb_bind(so, (struct sockaddr *)&sin, NULL, p); 754 return error; 755 } 756 } 757 } else if (addr != NULL) { 758 /* IPV6_V6ONLY socket */ 759 if (addr->sa_family == AF_INET) { 760 /* can't bind v4 addr to v6 only socket! */ 761 SCTP_LTRACE_ERR_RET(inp, NULL, NULL, SCTP_FROM_SCTP6_USRREQ, EINVAL); 762 return EINVAL; 763 } else { 764 struct sockaddr_in6 *sin6_p; 765 766 sin6_p = (struct sockaddr_in6 *)addr; 767 768 if (IN6_IS_ADDR_V4MAPPED(&sin6_p->sin6_addr)) { 769 /* can't bind v4-mapped addrs either! */ 770 /* NOTE: we don't support SIIT */ 771 SCTP_LTRACE_ERR_RET(inp, NULL, NULL, SCTP_FROM_SCTP6_USRREQ, EINVAL); 772 return EINVAL; 773 } 774 } 775 } 776 error = sctp_inpcb_bind(so, addr, NULL, p); 777 return error; 778} 779 780 781static void 782sctp6_close(struct socket *so) 783{ 784 sctp_close(so); 785} 786 787/* This could be made common with sctp_detach() since they are identical */ 788 789static 790int 791sctp6_disconnect(struct socket *so) 792{ 793 return (sctp_disconnect(so)); 794} 795 796 797int 798sctp_sendm(struct socket *so, int flags, struct mbuf *m, struct sockaddr *addr, 799 struct mbuf *control, struct thread *p); 800 801 802static int 803sctp6_send(struct socket *so, int flags, struct mbuf *m, struct sockaddr *addr, 804 struct mbuf *control, struct thread *p) 805{ 806 struct sctp_inpcb *inp; 807 struct inpcb *in_inp; 808 struct in6pcb *inp6; 809 810#ifdef INET 811 struct sockaddr_in6 *sin6; 812 813#endif /* INET */ 814 /* No SPL needed since sctp_output does this */ 815 816 inp = (struct sctp_inpcb *)so->so_pcb; 817 if (inp == NULL) { 818 if (control) { 819 SCTP_RELEASE_PKT(control); 820 control = NULL; 821 } 822 SCTP_RELEASE_PKT(m); 823 SCTP_LTRACE_ERR_RET(inp, NULL, NULL, SCTP_FROM_SCTP6_USRREQ, EINVAL); 824 return EINVAL; 825 } 826 in_inp = (struct inpcb *)inp; 827 inp6 = (struct in6pcb *)inp; 828 /* 829 * For the TCP model we may get a NULL addr, if we are a connected 830 * socket thats ok. 831 */ 832 if ((inp->sctp_flags & SCTP_PCB_FLAGS_CONNECTED) && 833 (addr == NULL)) { 834 goto connected_type; 835 } 836 if (addr == NULL) { 837 SCTP_RELEASE_PKT(m); 838 if (control) { 839 SCTP_RELEASE_PKT(control); 840 control = NULL; 841 } 842 SCTP_LTRACE_ERR_RET(inp, NULL, NULL, SCTP_FROM_SCTP6_USRREQ, EDESTADDRREQ); 843 return (EDESTADDRREQ); 844 } 845#ifdef INET 846 sin6 = (struct sockaddr_in6 *)addr; 847 if (SCTP_IPV6_V6ONLY(inp6)) { 848 /* 849 * if IPV6_V6ONLY flag, we discard datagrams destined to a 850 * v4 addr or v4-mapped addr 851 */ 852 if (addr->sa_family == AF_INET) { 853 SCTP_LTRACE_ERR_RET(inp, NULL, NULL, SCTP_FROM_SCTP6_USRREQ, EINVAL); 854 return EINVAL; 855 } 856 if (IN6_IS_ADDR_V4MAPPED(&sin6->sin6_addr)) { 857 SCTP_LTRACE_ERR_RET(inp, NULL, NULL, SCTP_FROM_SCTP6_USRREQ, EINVAL); 858 return EINVAL; 859 } 860 } 861 if (IN6_IS_ADDR_V4MAPPED(&sin6->sin6_addr)) { 862 if (!MODULE_GLOBAL(MOD_INET6, ip6_v6only)) { 863 struct sockaddr_in sin; 864 865 /* convert v4-mapped into v4 addr and send */ 866 in6_sin6_2_sin(&sin, sin6); 867 return sctp_sendm(so, flags, m, (struct sockaddr *)&sin, 868 control, p); 869 } else { 870 /* mapped addresses aren't enabled */ 871 SCTP_LTRACE_ERR_RET(inp, NULL, NULL, SCTP_FROM_SCTP6_USRREQ, EINVAL); 872 return EINVAL; 873 } 874 } 875#endif /* INET */ 876connected_type: 877 /* now what about control */ 878 if (control) { 879 if (inp->control) { 880 SCTP_PRINTF("huh? control set?\n"); 881 SCTP_RELEASE_PKT(inp->control); 882 inp->control = NULL; 883 } 884 inp->control = control; 885 } 886 /* Place the data */ 887 if (inp->pkt) { 888 SCTP_BUF_NEXT(inp->pkt_last) = m; 889 inp->pkt_last = m; 890 } else { 891 inp->pkt_last = inp->pkt = m; 892 } 893 if ( 894 /* FreeBSD and MacOSX uses a flag passed */ 895 ((flags & PRUS_MORETOCOME) == 0) 896 ) { 897 /* 898 * note with the current version this code will only be used 899 * by OpenBSD, NetBSD and FreeBSD have methods for 900 * re-defining sosend() to use sctp_sosend(). One can 901 * optionaly switch back to this code (by changing back the 902 * defininitions but this is not advisable. 903 */ 904 int ret; 905 906 ret = sctp_output(inp, inp->pkt, addr, inp->control, p, flags); 907 inp->pkt = NULL; 908 inp->control = NULL; 909 return (ret); 910 } else { 911 return (0); 912 } 913} 914 915static int 916sctp6_connect(struct socket *so, struct sockaddr *addr, struct thread *p) 917{ 918 uint32_t vrf_id; 919 int error = 0; 920 struct sctp_inpcb *inp; 921 struct in6pcb *inp6; 922 struct sctp_tcb *stcb; 923 924#ifdef INET 925 struct sockaddr_in6 *sin6; 926 struct sockaddr_storage ss; 927 928#endif /* INET */ 929 930 inp6 = (struct in6pcb *)so->so_pcb; 931 inp = (struct sctp_inpcb *)so->so_pcb; 932 if (inp == 0) { 933 SCTP_LTRACE_ERR_RET(inp, NULL, NULL, SCTP_FROM_SCTP6_USRREQ, ECONNRESET); 934 return (ECONNRESET); /* I made the same as TCP since we are 935 * not setup? */ 936 } 937 if (addr == NULL) { 938 SCTP_LTRACE_ERR_RET(inp, NULL, NULL, SCTP_FROM_SCTP6_USRREQ, EINVAL); 939 return (EINVAL); 940 } 941 if ((addr->sa_family == AF_INET6) && (addr->sa_len != sizeof(struct sockaddr_in6))) { 942 SCTP_LTRACE_ERR_RET(inp, NULL, NULL, SCTP_FROM_SCTP6_USRREQ, EINVAL); 943 return (EINVAL); 944 } 945 if ((addr->sa_family == AF_INET) && (addr->sa_len != sizeof(struct sockaddr_in))) { 946 SCTP_LTRACE_ERR_RET(inp, NULL, NULL, SCTP_FROM_SCTP6_USRREQ, EINVAL); 947 return (EINVAL); 948 } 949 vrf_id = inp->def_vrf_id; 950 SCTP_ASOC_CREATE_LOCK(inp); 951 SCTP_INP_RLOCK(inp); 952 if ((inp->sctp_flags & SCTP_PCB_FLAGS_UNBOUND) == 953 SCTP_PCB_FLAGS_UNBOUND) { 954 /* Bind a ephemeral port */ 955 SCTP_INP_RUNLOCK(inp); 956 error = sctp6_bind(so, NULL, p); 957 if (error) { 958 SCTP_ASOC_CREATE_UNLOCK(inp); 959 960 return (error); 961 } 962 SCTP_INP_RLOCK(inp); 963 } 964 if ((inp->sctp_flags & SCTP_PCB_FLAGS_TCPTYPE) && 965 (inp->sctp_flags & SCTP_PCB_FLAGS_CONNECTED)) { 966 /* We are already connected AND the TCP model */ 967 SCTP_INP_RUNLOCK(inp); 968 SCTP_ASOC_CREATE_UNLOCK(inp); 969 SCTP_LTRACE_ERR_RET(inp, NULL, NULL, SCTP_FROM_SCTP6_USRREQ, EADDRINUSE); 970 return (EADDRINUSE); 971 } 972#ifdef INET 973 sin6 = (struct sockaddr_in6 *)addr; 974 if (SCTP_IPV6_V6ONLY(inp6)) { 975 /* 976 * if IPV6_V6ONLY flag, ignore connections destined to a v4 977 * addr or v4-mapped addr 978 */ 979 if (addr->sa_family == AF_INET) { 980 SCTP_INP_RUNLOCK(inp); 981 SCTP_ASOC_CREATE_UNLOCK(inp); 982 SCTP_LTRACE_ERR_RET(inp, NULL, NULL, SCTP_FROM_SCTP6_USRREQ, EINVAL); 983 return EINVAL; 984 } 985 if (IN6_IS_ADDR_V4MAPPED(&sin6->sin6_addr)) { 986 SCTP_INP_RUNLOCK(inp); 987 SCTP_ASOC_CREATE_UNLOCK(inp); 988 SCTP_LTRACE_ERR_RET(inp, NULL, NULL, SCTP_FROM_SCTP6_USRREQ, EINVAL); 989 return EINVAL; 990 } 991 } 992 if (IN6_IS_ADDR_V4MAPPED(&sin6->sin6_addr)) { 993 if (!MODULE_GLOBAL(MOD_INET6, ip6_v6only)) { 994 /* convert v4-mapped into v4 addr */ 995 in6_sin6_2_sin((struct sockaddr_in *)&ss, sin6); 996 addr = (struct sockaddr *)&ss; 997 } else { 998 /* mapped addresses aren't enabled */ 999 SCTP_INP_RUNLOCK(inp); 1000 SCTP_ASOC_CREATE_UNLOCK(inp); 1001 SCTP_LTRACE_ERR_RET(inp, NULL, NULL, SCTP_FROM_SCTP6_USRREQ, EINVAL); 1002 return EINVAL; 1003 } 1004 } else 1005#endif /* INET */ 1006 addr = addr; /* for true v6 address case */ 1007 1008 /* Now do we connect? */ 1009 if (inp->sctp_flags & SCTP_PCB_FLAGS_CONNECTED) { 1010 stcb = LIST_FIRST(&inp->sctp_asoc_list); 1011 if (stcb) { 1012 SCTP_TCB_UNLOCK(stcb); 1013 } 1014 SCTP_INP_RUNLOCK(inp); 1015 } else { 1016 SCTP_INP_RUNLOCK(inp); 1017 SCTP_INP_WLOCK(inp); 1018 SCTP_INP_INCR_REF(inp); 1019 SCTP_INP_WUNLOCK(inp); 1020 stcb = sctp_findassociation_ep_addr(&inp, addr, NULL, NULL, NULL); 1021 if (stcb == NULL) { 1022 SCTP_INP_WLOCK(inp); 1023 SCTP_INP_DECR_REF(inp); 1024 SCTP_INP_WUNLOCK(inp); 1025 } 1026 } 1027 1028 if (stcb != NULL) { 1029 /* Already have or am bring up an association */ 1030 SCTP_ASOC_CREATE_UNLOCK(inp); 1031 SCTP_TCB_UNLOCK(stcb); 1032 SCTP_LTRACE_ERR_RET(inp, NULL, NULL, SCTP_FROM_SCTP6_USRREQ, EALREADY); 1033 return (EALREADY); 1034 } 1035 /* We are GOOD to go */ 1036 stcb = sctp_aloc_assoc(inp, addr, 1, &error, 0, vrf_id, p); 1037 SCTP_ASOC_CREATE_UNLOCK(inp); 1038 if (stcb == NULL) { 1039 /* Gak! no memory */ 1040 return (error); 1041 } 1042 if (stcb->sctp_ep->sctp_flags & SCTP_PCB_FLAGS_TCPTYPE) { 1043 stcb->sctp_ep->sctp_flags |= SCTP_PCB_FLAGS_CONNECTED; 1044 /* Set the connected flag so we can queue data */ 1045 soisconnecting(so); 1046 } 1047 stcb->asoc.state = SCTP_STATE_COOKIE_WAIT; 1048 (void)SCTP_GETTIME_TIMEVAL(&stcb->asoc.time_entered); 1049 1050 /* initialize authentication parameters for the assoc */ 1051 sctp_initialize_auth_params(inp, stcb); 1052 1053 sctp_send_initiate(inp, stcb, SCTP_SO_LOCKED); 1054 SCTP_TCB_UNLOCK(stcb); 1055 return error; 1056} 1057 1058static int 1059sctp6_getaddr(struct socket *so, struct sockaddr **addr) 1060{ 1061 struct sockaddr_in6 *sin6; 1062 struct sctp_inpcb *inp; 1063 uint32_t vrf_id; 1064 struct sctp_ifa *sctp_ifa; 1065 1066 int error; 1067 1068 /* 1069 * Do the malloc first in case it blocks. 1070 */ 1071 SCTP_MALLOC_SONAME(sin6, struct sockaddr_in6 *, sizeof *sin6); 1072 sin6->sin6_family = AF_INET6; 1073 sin6->sin6_len = sizeof(*sin6); 1074 1075 inp = (struct sctp_inpcb *)so->so_pcb; 1076 if (inp == NULL) { 1077 SCTP_FREE_SONAME(sin6); 1078 SCTP_LTRACE_ERR_RET(inp, NULL, NULL, SCTP_FROM_SCTP6_USRREQ, ECONNRESET); 1079 return ECONNRESET; 1080 } 1081 SCTP_INP_RLOCK(inp); 1082 sin6->sin6_port = inp->sctp_lport; 1083 if (inp->sctp_flags & SCTP_PCB_FLAGS_BOUNDALL) { 1084 /* For the bound all case you get back 0 */ 1085 if (inp->sctp_flags & SCTP_PCB_FLAGS_CONNECTED) { 1086 struct sctp_tcb *stcb; 1087 struct sockaddr_in6 *sin_a6; 1088 struct sctp_nets *net; 1089 int fnd; 1090 1091 stcb = LIST_FIRST(&inp->sctp_asoc_list); 1092 if (stcb == NULL) { 1093 goto notConn6; 1094 } 1095 fnd = 0; 1096 sin_a6 = NULL; 1097 TAILQ_FOREACH(net, &stcb->asoc.nets, sctp_next) { 1098 sin_a6 = (struct sockaddr_in6 *)&net->ro._l_addr; 1099 if (sin_a6 == NULL) 1100 /* this will make coverity happy */ 1101 continue; 1102 1103 if (sin_a6->sin6_family == AF_INET6) { 1104 fnd = 1; 1105 break; 1106 } 1107 } 1108 if ((!fnd) || (sin_a6 == NULL)) { 1109 /* punt */ 1110 goto notConn6; 1111 } 1112 vrf_id = inp->def_vrf_id; 1113 sctp_ifa = sctp_source_address_selection(inp, stcb, (sctp_route_t *) & net->ro, net, 0, vrf_id); 1114 if (sctp_ifa) { 1115 sin6->sin6_addr = sctp_ifa->address.sin6.sin6_addr; 1116 } 1117 } else { 1118 /* For the bound all case you get back 0 */ 1119 notConn6: 1120 memset(&sin6->sin6_addr, 0, sizeof(sin6->sin6_addr)); 1121 } 1122 } else { 1123 /* Take the first IPv6 address in the list */ 1124 struct sctp_laddr *laddr; 1125 int fnd = 0; 1126 1127 LIST_FOREACH(laddr, &inp->sctp_addr_list, sctp_nxt_addr) { 1128 if (laddr->ifa->address.sa.sa_family == AF_INET6) { 1129 struct sockaddr_in6 *sin_a; 1130 1131 sin_a = (struct sockaddr_in6 *)&laddr->ifa->address.sin6; 1132 sin6->sin6_addr = sin_a->sin6_addr; 1133 fnd = 1; 1134 break; 1135 } 1136 } 1137 if (!fnd) { 1138 SCTP_FREE_SONAME(sin6); 1139 SCTP_INP_RUNLOCK(inp); 1140 SCTP_LTRACE_ERR_RET(inp, NULL, NULL, SCTP_FROM_SCTP6_USRREQ, ENOENT); 1141 return ENOENT; 1142 } 1143 } 1144 SCTP_INP_RUNLOCK(inp); 1145 /* Scoping things for v6 */ 1146 if ((error = sa6_recoverscope(sin6)) != 0) { 1147 SCTP_FREE_SONAME(sin6); 1148 return (error); 1149 } 1150 (*addr) = (struct sockaddr *)sin6; 1151 return (0); 1152} 1153 1154static int 1155sctp6_peeraddr(struct socket *so, struct sockaddr **addr) 1156{ 1157 struct sockaddr_in6 *sin6 = (struct sockaddr_in6 *)*addr; 1158 int fnd; 1159 struct sockaddr_in6 *sin_a6; 1160 struct sctp_inpcb *inp; 1161 struct sctp_tcb *stcb; 1162 struct sctp_nets *net; 1163 1164 int error; 1165 1166 /* 1167 * Do the malloc first in case it blocks. 1168 */ 1169 inp = (struct sctp_inpcb *)so->so_pcb; 1170 if ((inp->sctp_flags & SCTP_PCB_FLAGS_CONNECTED) == 0) { 1171 /* UDP type and listeners will drop out here */ 1172 SCTP_LTRACE_ERR_RET(inp, NULL, NULL, SCTP_FROM_SCTP6_USRREQ, ENOTCONN); 1173 return (ENOTCONN); 1174 } 1175 SCTP_MALLOC_SONAME(sin6, struct sockaddr_in6 *, sizeof *sin6); 1176 sin6->sin6_family = AF_INET6; 1177 sin6->sin6_len = sizeof(*sin6); 1178 1179 /* We must recapture incase we blocked */ 1180 inp = (struct sctp_inpcb *)so->so_pcb; 1181 if (inp == NULL) { 1182 SCTP_FREE_SONAME(sin6); 1183 SCTP_LTRACE_ERR_RET(inp, NULL, NULL, SCTP_FROM_SCTP6_USRREQ, ECONNRESET); 1184 return ECONNRESET; 1185 } 1186 SCTP_INP_RLOCK(inp); 1187 stcb = LIST_FIRST(&inp->sctp_asoc_list); 1188 if (stcb) { 1189 SCTP_TCB_LOCK(stcb); 1190 } 1191 SCTP_INP_RUNLOCK(inp); 1192 if (stcb == NULL) { 1193 SCTP_FREE_SONAME(sin6); 1194 SCTP_LTRACE_ERR_RET(inp, NULL, NULL, SCTP_FROM_SCTP6_USRREQ, ECONNRESET); 1195 return ECONNRESET; 1196 } 1197 fnd = 0; 1198 TAILQ_FOREACH(net, &stcb->asoc.nets, sctp_next) { 1199 sin_a6 = (struct sockaddr_in6 *)&net->ro._l_addr; 1200 if (sin_a6->sin6_family == AF_INET6) { 1201 fnd = 1; 1202 sin6->sin6_port = stcb->rport; 1203 sin6->sin6_addr = sin_a6->sin6_addr; 1204 break; 1205 } 1206 } 1207 SCTP_TCB_UNLOCK(stcb); 1208 if (!fnd) { 1209 /* No IPv4 address */ 1210 SCTP_FREE_SONAME(sin6); 1211 SCTP_LTRACE_ERR_RET(inp, NULL, NULL, SCTP_FROM_SCTP6_USRREQ, ENOENT); 1212 return ENOENT; 1213 } 1214 if ((error = sa6_recoverscope(sin6)) != 0) 1215 return (error); 1216 *addr = (struct sockaddr *)sin6; 1217 return (0); 1218} 1219 1220static int 1221sctp6_in6getaddr(struct socket *so, struct sockaddr **nam) 1222{ 1223 struct sockaddr *addr; 1224 struct in6pcb *inp6 = sotoin6pcb(so); 1225 int error; 1226 1227 if (inp6 == NULL) { 1228 SCTP_LTRACE_ERR_RET(NULL, NULL, NULL, SCTP_FROM_SCTP6_USRREQ, EINVAL); 1229 return EINVAL; 1230 } 1231 /* allow v6 addresses precedence */ 1232 error = sctp6_getaddr(so, nam); 1233 if (error) { 1234 /* try v4 next if v6 failed */ 1235 error = sctp_ingetaddr(so, nam); 1236 if (error) { 1237 return (error); 1238 } 1239 addr = *nam; 1240 /* if I'm V6ONLY, convert it to v4-mapped */ 1241 if (SCTP_IPV6_V6ONLY(inp6)) { 1242 struct sockaddr_in6 sin6; 1243 1244 in6_sin_2_v4mapsin6((struct sockaddr_in *)addr, &sin6); 1245 memcpy(addr, &sin6, sizeof(struct sockaddr_in6)); 1246 1247 } 1248 } 1249 return (error); 1250} 1251 1252 1253static int 1254sctp6_getpeeraddr(struct socket *so, struct sockaddr **nam) 1255{ 1256 struct sockaddr *addr = *nam; 1257 struct in6pcb *inp6 = sotoin6pcb(so); 1258 int error; 1259 1260 if (inp6 == NULL) { 1261 SCTP_LTRACE_ERR_RET(NULL, NULL, NULL, SCTP_FROM_SCTP6_USRREQ, EINVAL); 1262 return EINVAL; 1263 } 1264 /* allow v6 addresses precedence */ 1265 error = sctp6_peeraddr(so, nam); 1266 if (error) { 1267 /* try v4 next if v6 failed */ 1268 error = sctp_peeraddr(so, nam); 1269 if (error) { 1270 return (error); 1271 } 1272 /* if I'm V6ONLY, convert it to v4-mapped */ 1273 if (SCTP_IPV6_V6ONLY(inp6)) { 1274 struct sockaddr_in6 sin6; 1275 1276 in6_sin_2_v4mapsin6((struct sockaddr_in *)addr, &sin6); 1277 memcpy(addr, &sin6, sizeof(struct sockaddr_in6)); 1278 } 1279 } 1280 return error; 1281} 1282 1283struct pr_usrreqs sctp6_usrreqs = { 1284 .pru_abort = sctp6_abort, 1285 .pru_accept = sctp_accept, 1286 .pru_attach = sctp6_attach, 1287 .pru_bind = sctp6_bind, 1288 .pru_connect = sctp6_connect, 1289 .pru_control = in6_control, 1290 .pru_close = sctp6_close, 1291 .pru_detach = sctp6_close, 1292 .pru_sopoll = sopoll_generic, 1293 .pru_flush = sctp_flush, 1294 .pru_disconnect = sctp6_disconnect, 1295 .pru_listen = sctp_listen, 1296 .pru_peeraddr = sctp6_getpeeraddr, 1297 .pru_send = sctp6_send, 1298 .pru_shutdown = sctp_shutdown, 1299 .pru_sockaddr = sctp6_in6getaddr, 1300 .pru_sosend = sctp_sosend, 1301 .pru_soreceive = sctp_soreceive 1302}; 1303