sctp6_usrreq.c revision 216669
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 216669 2010-12-22 17:59:38Z tuexen $"); 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 vrf_id = 0; 76 77#ifdef IPSEC 78 struct inpcb *in6p_ip; 79 80#endif 81 struct sctp_chunkhdr *ch; 82 int length, offset, iphlen; 83 uint8_t ecn_bits; 84 struct sctp_tcb *stcb = NULL; 85 int pkt_len = 0; 86 87#if !defined(SCTP_WITH_NO_CSUM) 88 uint32_t check, calc_check; 89 90#endif 91 int off = *offp; 92 uint16_t port = 0; 93 94 /* get the VRF and table id's */ 95 if (SCTP_GET_PKT_VRFID(*i_pak, vrf_id)) { 96 SCTP_RELEASE_PKT(*i_pak); 97 return (-1); 98 } 99 m = SCTP_HEADER_TO_CHAIN(*i_pak); 100 pkt_len = SCTP_HEADER_LEN((*i_pak)); 101 102#ifdef SCTP_PACKET_LOGGING 103 sctp_packet_log(m, pkt_len); 104#endif 105 ip6 = mtod(m, struct ip6_hdr *); 106 /* Ensure that (sctphdr + sctp_chunkhdr) in a row. */ 107 IP6_EXTHDR_GET(sh, struct sctphdr *, m, off, 108 (int)(sizeof(*sh) + sizeof(*ch))); 109 if (sh == NULL) { 110 SCTP_STAT_INCR(sctps_hdrops); 111 return IPPROTO_DONE; 112 } 113 ch = (struct sctp_chunkhdr *)((caddr_t)sh + sizeof(struct sctphdr)); 114 iphlen = off; 115 offset = iphlen + sizeof(*sh) + sizeof(*ch); 116 SCTPDBG(SCTP_DEBUG_INPUT1, 117 "sctp6_input() length:%d iphlen:%d\n", pkt_len, iphlen); 118 119 120#if defined(NFAITH) && NFAITH > 0 121 122 if (faithprefix_p != NULL && (*faithprefix_p) (&ip6->ip6_dst)) { 123 /* XXX send icmp6 host/port unreach? */ 124 goto bad; 125 } 126#endif /* NFAITH defined and > 0 */ 127 SCTP_STAT_INCR(sctps_recvpackets); 128 SCTP_STAT_INCR_COUNTER64(sctps_inpackets); 129 SCTPDBG(SCTP_DEBUG_INPUT1, "V6 input gets a packet iphlen:%d pktlen:%d\n", 130 iphlen, pkt_len); 131 if (IN6_IS_ADDR_MULTICAST(&ip6->ip6_dst)) { 132 /* No multi-cast support in SCTP */ 133 goto bad; 134 } 135 /* destination port of 0 is illegal, based on RFC2960. */ 136 if (sh->dest_port == 0) 137 goto bad; 138 139 SCTPDBG(SCTP_DEBUG_CRCOFFLOAD, 140 "sctp_input(): Packet of length %d received on %s with csum_flags 0x%x.\n", 141 m->m_pkthdr.len, 142 if_name(m->m_pkthdr.rcvif), 143 m->m_pkthdr.csum_flags); 144#if defined(SCTP_WITH_NO_CSUM) 145 SCTP_STAT_INCR(sctps_recvnocrc); 146#else 147 if (m->m_pkthdr.csum_flags & CSUM_SCTP_VALID) { 148 SCTP_STAT_INCR(sctps_recvhwcrc); 149 goto sctp_skip_csum; 150 } 151 check = sh->checksum; /* save incoming checksum */ 152 if ((check == 0) && (SCTP_BASE_SYSCTL(sctp_no_csum_on_loopback)) && 153 (IN6_ARE_ADDR_EQUAL(&ip6->ip6_src, &ip6->ip6_dst))) { 154 SCTP_STAT_INCR(sctps_recvnocrc); 155 goto sctp_skip_csum; 156 } 157 sh->checksum = 0; /* prepare for calc */ 158 calc_check = sctp_calculate_cksum(m, iphlen); 159 SCTP_STAT_INCR(sctps_recvswcrc); 160 if (calc_check != check) { 161 SCTPDBG(SCTP_DEBUG_INPUT1, "Bad CSUM on SCTP packet calc_check:%x check:%x m:%p phlen:%d\n", 162 calc_check, check, m, iphlen); 163 stcb = sctp_findassociation_addr(m, iphlen, offset - sizeof(*ch), 164 sh, ch, &in6p, &net, vrf_id); 165 if ((net) && (port)) { 166 if (net->port == 0) { 167 sctp_pathmtu_adjustment(in6p, stcb, net, net->mtu - sizeof(struct udphdr)); 168 } 169 net->port = port; 170 } 171 /* in6p's ref-count increased && stcb locked */ 172 if ((in6p) && (stcb)) { 173 sctp_send_packet_dropped(stcb, net, m, iphlen, 1); 174 sctp_chunk_output((struct sctp_inpcb *)in6p, stcb, SCTP_OUTPUT_FROM_INPUT_ERROR, SCTP_SO_NOT_LOCKED); 175 } else if ((in6p != NULL) && (stcb == NULL)) { 176 refcount_up = 1; 177 } 178 SCTP_STAT_INCR(sctps_badsum); 179 SCTP_STAT_INCR_COUNTER32(sctps_checksumerrors); 180 goto bad; 181 } 182 sh->checksum = calc_check; 183 184sctp_skip_csum: 185#endif 186 net = NULL; 187 /* 188 * Locate pcb and tcb for datagram sctp_findassociation_addr() wants 189 * IP/SCTP/first chunk header... 190 */ 191 stcb = sctp_findassociation_addr(m, iphlen, offset - sizeof(*ch), 192 sh, ch, &in6p, &net, vrf_id); 193 if ((net) && (port)) { 194 if (net->port == 0) { 195 sctp_pathmtu_adjustment(in6p, stcb, net, net->mtu - sizeof(struct udphdr)); 196 } 197 net->port = port; 198 } 199 /* in6p's ref-count increased */ 200 if (in6p == NULL) { 201 struct sctp_init_chunk *init_chk, chunk_buf; 202 203 SCTP_STAT_INCR(sctps_noport); 204 if (ch->chunk_type == SCTP_INITIATION) { 205 /* 206 * we do a trick here to get the INIT tag, dig in 207 * and get the tag from the INIT and put it in the 208 * common header. 209 */ 210 init_chk = (struct sctp_init_chunk *)sctp_m_getptr(m, 211 iphlen + sizeof(*sh), sizeof(*init_chk), 212 (uint8_t *) & chunk_buf); 213 if (init_chk) 214 sh->v_tag = init_chk->init.initiate_tag; 215 else 216 sh->v_tag = 0; 217 } 218 if (ch->chunk_type == SCTP_SHUTDOWN_ACK) { 219 sctp_send_shutdown_complete2(m, iphlen, sh, vrf_id, port); 220 goto bad; 221 } 222 if (ch->chunk_type == SCTP_SHUTDOWN_COMPLETE) { 223 goto bad; 224 } 225 if (ch->chunk_type != SCTP_ABORT_ASSOCIATION) 226 sctp_send_abort(m, iphlen, sh, 0, NULL, vrf_id, port); 227 goto bad; 228 } else if (stcb == NULL) { 229 refcount_up = 1; 230 } 231#ifdef IPSEC 232 /* 233 * Check AH/ESP integrity. 234 */ 235 in6p_ip = (struct inpcb *)in6p; 236 if (in6p_ip && (ipsec6_in_reject(m, in6p_ip))) { 237/* XXX */ 238 MODULE_GLOBAL(ipsec6stat).in_polvio++; 239 goto bad; 240 } 241#endif /* IPSEC */ 242 243 /* 244 * CONTROL chunk processing 245 */ 246 offset -= sizeof(*ch); 247 ecn_bits = ((ntohl(ip6->ip6_flow) >> 20) & 0x000000ff); 248 249 /* Length now holds the total packet length payload + iphlen */ 250 length = ntohs(ip6->ip6_plen) + iphlen; 251 252 /* sa_ignore NO_NULL_CHK */ 253 sctp_common_input_processing(&m, iphlen, offset, length, sh, ch, 254 in6p, stcb, net, ecn_bits, vrf_id, port); 255 /* inp's ref-count reduced && stcb unlocked */ 256 /* XXX this stuff below gets moved to appropriate parts later... */ 257 if (m) 258 sctp_m_freem(m); 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 return IPPROTO_DONE; 266 267bad: 268 if (stcb) { 269 SCTP_TCB_UNLOCK(stcb); 270 } 271 if ((in6p) && refcount_up) { 272 /* reduce ref-count */ 273 SCTP_INP_WLOCK(in6p); 274 SCTP_INP_DECR_REF(in6p); 275 SCTP_INP_WUNLOCK(in6p); 276 } 277 if (m) 278 sctp_m_freem(m); 279 return IPPROTO_DONE; 280} 281 282 283static void 284sctp6_notify_mbuf(struct sctp_inpcb *inp, struct icmp6_hdr *icmp6, 285 struct sctphdr *sh, struct sctp_tcb *stcb, struct sctp_nets *net) 286{ 287 uint32_t nxtsz; 288 289 if ((inp == NULL) || (stcb == NULL) || (net == NULL) || 290 (icmp6 == NULL) || (sh == NULL)) { 291 goto out; 292 } 293 /* First do we even look at it? */ 294 if (ntohl(sh->v_tag) != (stcb->asoc.peer_vtag)) 295 goto out; 296 297 if (icmp6->icmp6_type != ICMP6_PACKET_TOO_BIG) { 298 /* not PACKET TO BIG */ 299 goto out; 300 } 301 /* 302 * ok we need to look closely. We could even get smarter and look at 303 * anyone that we sent to in case we get a different ICMP that tells 304 * us there is no way to reach a host, but for this impl, all we 305 * care about is MTU discovery. 306 */ 307 nxtsz = ntohl(icmp6->icmp6_mtu); 308 /* Stop any PMTU timer */ 309 sctp_timer_stop(SCTP_TIMER_TYPE_PATHMTURAISE, inp, stcb, NULL, SCTP_FROM_SCTP6_USRREQ + SCTP_LOC_1); 310 311 /* Adjust destination size limit */ 312 if (net->mtu > nxtsz) { 313 net->mtu = nxtsz; 314 if (net->port) { 315 net->mtu -= sizeof(struct udphdr); 316 } 317 } 318 /* now what about the ep? */ 319 if (stcb->asoc.smallest_mtu > nxtsz) { 320 struct sctp_tmit_chunk *chk; 321 322 /* Adjust that too */ 323 stcb->asoc.smallest_mtu = nxtsz; 324 /* now off to subtract IP_DF flag if needed */ 325 326 TAILQ_FOREACH(chk, &stcb->asoc.send_queue, sctp_next) { 327 if ((uint32_t) (chk->send_size + IP_HDR_SIZE) > nxtsz) { 328 chk->flags |= CHUNK_FLAGS_FRAGMENT_OK; 329 } 330 } 331 TAILQ_FOREACH(chk, &stcb->asoc.sent_queue, sctp_next) { 332 if ((uint32_t) (chk->send_size + IP_HDR_SIZE) > nxtsz) { 333 /* 334 * For this guy we also mark for immediate 335 * resend since we sent to big of chunk 336 */ 337 chk->flags |= CHUNK_FLAGS_FRAGMENT_OK; 338 if (chk->sent != SCTP_DATAGRAM_RESEND) 339 stcb->asoc.sent_queue_retran_cnt++; 340 chk->sent = SCTP_DATAGRAM_RESEND; 341 chk->rec.data.doing_fast_retransmit = 0; 342 343 chk->sent = SCTP_DATAGRAM_RESEND; 344 /* Clear any time so NO RTT is being done */ 345 chk->sent_rcv_time.tv_sec = 0; 346 chk->sent_rcv_time.tv_usec = 0; 347 stcb->asoc.total_flight -= chk->send_size; 348 net->flight_size -= chk->send_size; 349 } 350 } 351 } 352 sctp_timer_start(SCTP_TIMER_TYPE_PATHMTURAISE, inp, stcb, NULL); 353out: 354 if (stcb) { 355 SCTP_TCB_UNLOCK(stcb); 356 } 357} 358 359 360void 361sctp6_notify(struct sctp_inpcb *inp, 362 struct icmp6_hdr *icmph, 363 struct sctphdr *sh, 364 struct sockaddr *to, 365 struct sctp_tcb *stcb, 366 struct sctp_nets *net) 367{ 368#if defined (__APPLE__) || defined(SCTP_SO_LOCK_TESTING) 369 struct socket *so; 370 371#endif 372 /* protection */ 373 int reason; 374 375 376 if ((inp == NULL) || (stcb == NULL) || (net == NULL) || 377 (sh == NULL) || (to == NULL)) { 378 if (stcb) 379 SCTP_TCB_UNLOCK(stcb); 380 return; 381 } 382 /* First job is to verify the vtag matches what I would send */ 383 if (ntohl(sh->v_tag) != (stcb->asoc.peer_vtag)) { 384 SCTP_TCB_UNLOCK(stcb); 385 return; 386 } 387 if (icmph->icmp6_type != ICMP_UNREACH) { 388 /* We only care about unreachable */ 389 SCTP_TCB_UNLOCK(stcb); 390 return; 391 } 392 if ((icmph->icmp6_code == ICMP_UNREACH_NET) || 393 (icmph->icmp6_code == ICMP_UNREACH_HOST) || 394 (icmph->icmp6_code == ICMP_UNREACH_NET_UNKNOWN) || 395 (icmph->icmp6_code == ICMP_UNREACH_HOST_UNKNOWN) || 396 (icmph->icmp6_code == ICMP_UNREACH_ISOLATED) || 397 (icmph->icmp6_code == ICMP_UNREACH_NET_PROHIB) || 398 (icmph->icmp6_code == ICMP_UNREACH_HOST_PROHIB) || 399 (icmph->icmp6_code == ICMP_UNREACH_FILTER_PROHIB)) { 400 401 /* 402 * Hmm reachablity problems we must examine closely. If its 403 * not reachable, we may have lost a network. Or if there is 404 * NO protocol at the other end named SCTP. well we consider 405 * it a OOTB abort. 406 */ 407 if (net->dest_state & SCTP_ADDR_REACHABLE) { 408 /* Ok that destination is NOT reachable */ 409 SCTP_PRINTF("ICMP (thresh %d/%d) takes interface %p down\n", 410 net->error_count, 411 net->failure_threshold, 412 net); 413 414 net->dest_state &= ~SCTP_ADDR_REACHABLE; 415 net->dest_state |= SCTP_ADDR_NOT_REACHABLE; 416 /* 417 * JRS 5/14/07 - If a destination is unreachable, 418 * the PF bit is turned off. This allows an 419 * unambiguous use of the PF bit for destinations 420 * that are reachable but potentially failed. If the 421 * destination is set to the unreachable state, also 422 * set the destination to the PF state. 423 */ 424 /* 425 * Add debug message here if destination is not in 426 * PF state. 427 */ 428 /* Stop any running T3 timers here? */ 429 if ((stcb->asoc.sctp_cmt_on_off > 0) && 430 (stcb->asoc.sctp_cmt_pf > 0)) { 431 net->dest_state &= ~SCTP_ADDR_PF; 432 SCTPDBG(SCTP_DEBUG_TIMER4, "Destination %p moved from PF to unreachable.\n", 433 net); 434 } 435 net->error_count = net->failure_threshold + 1; 436 sctp_ulp_notify(SCTP_NOTIFY_INTERFACE_DOWN, 437 stcb, SCTP_FAILED_THRESHOLD, 438 (void *)net, SCTP_SO_NOT_LOCKED); 439 } 440 SCTP_TCB_UNLOCK(stcb); 441 } else if ((icmph->icmp6_code == ICMP_UNREACH_PROTOCOL) || 442 (icmph->icmp6_code == ICMP_UNREACH_PORT)) { 443 /* 444 * Here the peer is either playing tricks on us, including 445 * an address that belongs to someone who does not support 446 * SCTP OR was a userland implementation that shutdown and 447 * now is dead. In either case treat it like a OOTB abort 448 * with no TCB 449 */ 450 reason = SCTP_PEER_FAULTY; 451 sctp_abort_notification(stcb, reason, SCTP_SO_NOT_LOCKED); 452#if defined (__APPLE__) || defined(SCTP_SO_LOCK_TESTING) 453 so = SCTP_INP_SO(inp); 454 atomic_add_int(&stcb->asoc.refcnt, 1); 455 SCTP_TCB_UNLOCK(stcb); 456 SCTP_SOCKET_LOCK(so, 1); 457 SCTP_TCB_LOCK(stcb); 458 atomic_subtract_int(&stcb->asoc.refcnt, 1); 459#endif 460 (void)sctp_free_assoc(inp, stcb, SCTP_NORMAL_PROC, SCTP_FROM_SCTP_USRREQ + SCTP_LOC_2); 461#if defined (__APPLE__) || defined(SCTP_SO_LOCK_TESTING) 462 SCTP_SOCKET_UNLOCK(so, 1); 463 /* SCTP_TCB_UNLOCK(stcb); MT: I think this is not needed. */ 464#endif 465 /* no need to unlock here, since the TCB is gone */ 466 } else { 467 SCTP_TCB_UNLOCK(stcb); 468 } 469} 470 471 472 473void 474sctp6_ctlinput(int cmd, struct sockaddr *pktdst, void *d) 475{ 476 struct sctphdr sh; 477 struct ip6ctlparam *ip6cp = NULL; 478 uint32_t vrf_id; 479 480 vrf_id = SCTP_DEFAULT_VRFID; 481 482 if (pktdst->sa_family != AF_INET6 || 483 pktdst->sa_len != sizeof(struct sockaddr_in6)) 484 return; 485 486 if ((unsigned)cmd >= PRC_NCMDS) 487 return; 488 if (PRC_IS_REDIRECT(cmd)) { 489 d = NULL; 490 } else if (inet6ctlerrmap[cmd] == 0) { 491 return; 492 } 493 /* if the parameter is from icmp6, decode it. */ 494 if (d != NULL) { 495 ip6cp = (struct ip6ctlparam *)d; 496 } else { 497 ip6cp = (struct ip6ctlparam *)NULL; 498 } 499 500 if (ip6cp) { 501 /* 502 * XXX: We assume that when IPV6 is non NULL, M and OFF are 503 * valid. 504 */ 505 /* check if we can safely examine src and dst ports */ 506 struct sctp_inpcb *inp = NULL; 507 struct sctp_tcb *stcb = NULL; 508 struct sctp_nets *net = NULL; 509 struct sockaddr_in6 final; 510 511 if (ip6cp->ip6c_m == NULL) 512 return; 513 514 bzero(&sh, sizeof(sh)); 515 bzero(&final, sizeof(final)); 516 inp = NULL; 517 net = NULL; 518 m_copydata(ip6cp->ip6c_m, ip6cp->ip6c_off, sizeof(sh), 519 (caddr_t)&sh); 520 ip6cp->ip6c_src->sin6_port = sh.src_port; 521 final.sin6_len = sizeof(final); 522 final.sin6_family = AF_INET6; 523 final.sin6_addr = ((struct sockaddr_in6 *)pktdst)->sin6_addr; 524 final.sin6_port = sh.dest_port; 525 stcb = sctp_findassociation_addr_sa((struct sockaddr *)ip6cp->ip6c_src, 526 (struct sockaddr *)&final, 527 &inp, &net, 1, vrf_id); 528 /* inp's ref-count increased && stcb locked */ 529 if (stcb != NULL && inp && (inp->sctp_socket != NULL)) { 530 if (cmd == PRC_MSGSIZE) { 531 sctp6_notify_mbuf(inp, 532 ip6cp->ip6c_icmp6, 533 &sh, 534 stcb, 535 net); 536 /* inp's ref-count reduced && stcb unlocked */ 537 } else { 538 sctp6_notify(inp, ip6cp->ip6c_icmp6, &sh, 539 (struct sockaddr *)&final, 540 stcb, net); 541 /* inp's ref-count reduced && stcb unlocked */ 542 } 543 } else { 544 if (PRC_IS_REDIRECT(cmd) && inp) { 545 in6_rtchange((struct in6pcb *)inp, 546 inet6ctlerrmap[cmd]); 547 } 548 if (inp) { 549 /* reduce inp's ref-count */ 550 SCTP_INP_WLOCK(inp); 551 SCTP_INP_DECR_REF(inp); 552 SCTP_INP_WUNLOCK(inp); 553 } 554 if (stcb) 555 SCTP_TCB_UNLOCK(stcb); 556 } 557 } 558} 559 560/* 561 * this routine can probably be collasped into the one in sctp_userreq.c 562 * since they do the same thing and now we lookup with a sockaddr 563 */ 564static int 565sctp6_getcred(SYSCTL_HANDLER_ARGS) 566{ 567 struct xucred xuc; 568 struct sockaddr_in6 addrs[2]; 569 struct sctp_inpcb *inp; 570 struct sctp_nets *net; 571 struct sctp_tcb *stcb; 572 int error; 573 uint32_t vrf_id; 574 575 vrf_id = SCTP_DEFAULT_VRFID; 576 577 error = priv_check(req->td, PRIV_NETINET_GETCRED); 578 if (error) 579 return (error); 580 581 if (req->newlen != sizeof(addrs)) { 582 SCTP_LTRACE_ERR_RET(NULL, NULL, NULL, SCTP_FROM_SCTP6_USRREQ, EINVAL); 583 return (EINVAL); 584 } 585 if (req->oldlen != sizeof(struct ucred)) { 586 SCTP_LTRACE_ERR_RET(NULL, NULL, NULL, SCTP_FROM_SCTP6_USRREQ, EINVAL); 587 return (EINVAL); 588 } 589 error = SYSCTL_IN(req, addrs, sizeof(addrs)); 590 if (error) 591 return (error); 592 593 stcb = sctp_findassociation_addr_sa(sin6tosa(&addrs[0]), 594 sin6tosa(&addrs[1]), 595 &inp, &net, 1, vrf_id); 596 if (stcb == NULL || inp == NULL || inp->sctp_socket == NULL) { 597 if ((inp != NULL) && (stcb == NULL)) { 598 /* reduce ref-count */ 599 SCTP_INP_WLOCK(inp); 600 SCTP_INP_DECR_REF(inp); 601 goto cred_can_cont; 602 } 603 SCTP_LTRACE_ERR_RET(inp, NULL, NULL, SCTP_FROM_SCTP6_USRREQ, ENOENT); 604 error = ENOENT; 605 goto out; 606 } 607 SCTP_TCB_UNLOCK(stcb); 608 /* 609 * We use the write lock here, only since in the error leg we need 610 * it. If we used RLOCK, then we would have to 611 * wlock/decr/unlock/rlock. Which in theory could create a hole. 612 * Better to use higher wlock. 613 */ 614 SCTP_INP_WLOCK(inp); 615cred_can_cont: 616 error = cr_canseesocket(req->td->td_ucred, inp->sctp_socket); 617 if (error) { 618 SCTP_INP_WUNLOCK(inp); 619 goto out; 620 } 621 cru2x(inp->sctp_socket->so_cred, &xuc); 622 SCTP_INP_WUNLOCK(inp); 623 error = SYSCTL_OUT(req, &xuc, sizeof(struct xucred)); 624out: 625 return (error); 626} 627 628SYSCTL_PROC(_net_inet6_sctp6, OID_AUTO, getcred, CTLTYPE_OPAQUE | CTLFLAG_RW, 629 0, 0, 630 sctp6_getcred, "S,ucred", "Get the ucred of a SCTP6 connection"); 631 632 633/* This is the same as the sctp_abort() could be made common */ 634static void 635sctp6_abort(struct socket *so) 636{ 637 struct sctp_inpcb *inp; 638 uint32_t flags; 639 640 inp = (struct sctp_inpcb *)so->so_pcb; 641 if (inp == 0) { 642 SCTP_LTRACE_ERR_RET(inp, NULL, NULL, SCTP_FROM_SCTP6_USRREQ, EINVAL); 643 return; 644 } 645sctp_must_try_again: 646 flags = inp->sctp_flags; 647#ifdef SCTP_LOG_CLOSING 648 sctp_log_closing(inp, NULL, 17); 649#endif 650 if (((flags & SCTP_PCB_FLAGS_SOCKET_GONE) == 0) && 651 (atomic_cmpset_int(&inp->sctp_flags, flags, (flags | SCTP_PCB_FLAGS_SOCKET_GONE | SCTP_PCB_FLAGS_CLOSE_IP)))) { 652#ifdef SCTP_LOG_CLOSING 653 sctp_log_closing(inp, NULL, 16); 654#endif 655 sctp_inpcb_free(inp, SCTP_FREE_SHOULD_USE_ABORT, 656 SCTP_CALLED_AFTER_CMPSET_OFCLOSE); 657 SOCK_LOCK(so); 658 SCTP_SB_CLEAR(so->so_snd); 659 /* 660 * same for the rcv ones, they are only here for the 661 * accounting/select. 662 */ 663 SCTP_SB_CLEAR(so->so_rcv); 664 /* Now null out the reference, we are completely detached. */ 665 so->so_pcb = NULL; 666 SOCK_UNLOCK(so); 667 } else { 668 flags = inp->sctp_flags; 669 if ((flags & SCTP_PCB_FLAGS_SOCKET_GONE) == 0) { 670 goto sctp_must_try_again; 671 } 672 } 673 return; 674} 675 676static int 677sctp6_attach(struct socket *so, int proto, struct thread *p) 678{ 679 struct in6pcb *inp6; 680 int error; 681 struct sctp_inpcb *inp; 682 uint32_t vrf_id = SCTP_DEFAULT_VRFID; 683 684 inp = (struct sctp_inpcb *)so->so_pcb; 685 if (inp != NULL) { 686 SCTP_LTRACE_ERR_RET(inp, NULL, NULL, SCTP_FROM_SCTP6_USRREQ, EINVAL); 687 return EINVAL; 688 } 689 if (so->so_snd.sb_hiwat == 0 || so->so_rcv.sb_hiwat == 0) { 690 error = SCTP_SORESERVE(so, SCTP_BASE_SYSCTL(sctp_sendspace), SCTP_BASE_SYSCTL(sctp_recvspace)); 691 if (error) 692 return error; 693 } 694 error = sctp_inpcb_alloc(so, vrf_id); 695 if (error) 696 return error; 697 inp = (struct sctp_inpcb *)so->so_pcb; 698 SCTP_INP_WLOCK(inp); 699 inp->sctp_flags |= SCTP_PCB_FLAGS_BOUND_V6; /* I'm v6! */ 700 inp6 = (struct in6pcb *)inp; 701 702 inp6->inp_vflag |= INP_IPV6; 703 inp6->in6p_hops = -1; /* use kernel default */ 704 inp6->in6p_cksum = -1; /* just to be sure */ 705#ifdef INET 706 /* 707 * XXX: ugly!! IPv4 TTL initialization is necessary for an IPv6 708 * socket as well, because the socket may be bound to an IPv6 709 * wildcard address, which may match an IPv4-mapped IPv6 address. 710 */ 711 inp6->inp_ip_ttl = MODULE_GLOBAL(ip_defttl); 712#endif 713 /* 714 * Hmm what about the IPSEC stuff that is missing here but in 715 * sctp_attach()? 716 */ 717 SCTP_INP_WUNLOCK(inp); 718 return 0; 719} 720 721static int 722sctp6_bind(struct socket *so, struct sockaddr *addr, struct thread *p) 723{ 724 struct sctp_inpcb *inp; 725 struct in6pcb *inp6; 726 int error; 727 728 inp = (struct sctp_inpcb *)so->so_pcb; 729 if (inp == 0) { 730 SCTP_LTRACE_ERR_RET(inp, NULL, NULL, SCTP_FROM_SCTP6_USRREQ, EINVAL); 731 return EINVAL; 732 } 733 if (addr) { 734 if ((addr->sa_family == AF_INET6) && 735 (addr->sa_len != sizeof(struct sockaddr_in6))) { 736 SCTP_LTRACE_ERR_RET(inp, NULL, NULL, SCTP_FROM_SCTP6_USRREQ, EINVAL); 737 return EINVAL; 738 } 739 if ((addr->sa_family == AF_INET) && 740 (addr->sa_len != sizeof(struct sockaddr_in))) { 741 SCTP_LTRACE_ERR_RET(inp, NULL, NULL, SCTP_FROM_SCTP6_USRREQ, EINVAL); 742 return EINVAL; 743 } 744 } 745 inp6 = (struct in6pcb *)inp; 746 inp6->inp_vflag &= ~INP_IPV4; 747 inp6->inp_vflag |= INP_IPV6; 748 if ((addr != NULL) && (SCTP_IPV6_V6ONLY(inp6) == 0)) { 749 if (addr->sa_family == AF_INET) { 750 /* binding v4 addr to v6 socket, so reset flags */ 751 inp6->inp_vflag |= INP_IPV4; 752 inp6->inp_vflag &= ~INP_IPV6; 753 } else { 754 struct sockaddr_in6 *sin6_p; 755 756 sin6_p = (struct sockaddr_in6 *)addr; 757 758 if (IN6_IS_ADDR_UNSPECIFIED(&sin6_p->sin6_addr)) { 759 inp6->inp_vflag |= INP_IPV4; 760 } else if (IN6_IS_ADDR_V4MAPPED(&sin6_p->sin6_addr)) { 761 struct sockaddr_in sin; 762 763 in6_sin6_2_sin(&sin, sin6_p); 764 inp6->inp_vflag |= INP_IPV4; 765 inp6->inp_vflag &= ~INP_IPV6; 766 error = sctp_inpcb_bind(so, (struct sockaddr *)&sin, NULL, p); 767 return error; 768 } 769 } 770 } else if (addr != NULL) { 771 /* IPV6_V6ONLY socket */ 772 if (addr->sa_family == AF_INET) { 773 /* can't bind v4 addr to v6 only socket! */ 774 SCTP_LTRACE_ERR_RET(inp, NULL, NULL, SCTP_FROM_SCTP6_USRREQ, EINVAL); 775 return EINVAL; 776 } else { 777 struct sockaddr_in6 *sin6_p; 778 779 sin6_p = (struct sockaddr_in6 *)addr; 780 781 if (IN6_IS_ADDR_V4MAPPED(&sin6_p->sin6_addr)) { 782 /* can't bind v4-mapped addrs either! */ 783 /* NOTE: we don't support SIIT */ 784 SCTP_LTRACE_ERR_RET(inp, NULL, NULL, SCTP_FROM_SCTP6_USRREQ, EINVAL); 785 return EINVAL; 786 } 787 } 788 } 789 error = sctp_inpcb_bind(so, addr, NULL, p); 790 return error; 791} 792 793 794static void 795sctp6_close(struct socket *so) 796{ 797 sctp_close(so); 798} 799 800/* This could be made common with sctp_detach() since they are identical */ 801 802static 803int 804sctp6_disconnect(struct socket *so) 805{ 806 return (sctp_disconnect(so)); 807} 808 809 810int 811sctp_sendm(struct socket *so, int flags, struct mbuf *m, struct sockaddr *addr, 812 struct mbuf *control, struct thread *p); 813 814 815static int 816sctp6_send(struct socket *so, int flags, struct mbuf *m, struct sockaddr *addr, 817 struct mbuf *control, struct thread *p) 818{ 819 struct sctp_inpcb *inp; 820 struct in6pcb *inp6; 821 822#ifdef INET 823 struct sockaddr_in6 *sin6; 824 825#endif /* INET */ 826 /* No SPL needed since sctp_output does this */ 827 828 inp = (struct sctp_inpcb *)so->so_pcb; 829 if (inp == NULL) { 830 if (control) { 831 SCTP_RELEASE_PKT(control); 832 control = NULL; 833 } 834 SCTP_RELEASE_PKT(m); 835 SCTP_LTRACE_ERR_RET(inp, NULL, NULL, SCTP_FROM_SCTP6_USRREQ, EINVAL); 836 return EINVAL; 837 } 838 inp6 = (struct in6pcb *)inp; 839 /* 840 * For the TCP model we may get a NULL addr, if we are a connected 841 * socket thats ok. 842 */ 843 if ((inp->sctp_flags & SCTP_PCB_FLAGS_CONNECTED) && 844 (addr == NULL)) { 845 goto connected_type; 846 } 847 if (addr == NULL) { 848 SCTP_RELEASE_PKT(m); 849 if (control) { 850 SCTP_RELEASE_PKT(control); 851 control = NULL; 852 } 853 SCTP_LTRACE_ERR_RET(inp, NULL, NULL, SCTP_FROM_SCTP6_USRREQ, EDESTADDRREQ); 854 return (EDESTADDRREQ); 855 } 856#ifdef INET 857 sin6 = (struct sockaddr_in6 *)addr; 858 if (SCTP_IPV6_V6ONLY(inp6)) { 859 /* 860 * if IPV6_V6ONLY flag, we discard datagrams destined to a 861 * v4 addr or v4-mapped addr 862 */ 863 if (addr->sa_family == AF_INET) { 864 SCTP_LTRACE_ERR_RET(inp, NULL, NULL, SCTP_FROM_SCTP6_USRREQ, EINVAL); 865 return EINVAL; 866 } 867 if (IN6_IS_ADDR_V4MAPPED(&sin6->sin6_addr)) { 868 SCTP_LTRACE_ERR_RET(inp, NULL, NULL, SCTP_FROM_SCTP6_USRREQ, EINVAL); 869 return EINVAL; 870 } 871 } 872 if (IN6_IS_ADDR_V4MAPPED(&sin6->sin6_addr)) { 873 if (!MODULE_GLOBAL(ip6_v6only)) { 874 struct sockaddr_in sin; 875 876 /* convert v4-mapped into v4 addr and send */ 877 in6_sin6_2_sin(&sin, sin6); 878 return sctp_sendm(so, flags, m, (struct sockaddr *)&sin, 879 control, p); 880 } else { 881 /* mapped addresses aren't enabled */ 882 SCTP_LTRACE_ERR_RET(inp, NULL, NULL, SCTP_FROM_SCTP6_USRREQ, EINVAL); 883 return EINVAL; 884 } 885 } 886#endif /* INET */ 887connected_type: 888 /* now what about control */ 889 if (control) { 890 if (inp->control) { 891 SCTP_PRINTF("huh? control set?\n"); 892 SCTP_RELEASE_PKT(inp->control); 893 inp->control = NULL; 894 } 895 inp->control = control; 896 } 897 /* Place the data */ 898 if (inp->pkt) { 899 SCTP_BUF_NEXT(inp->pkt_last) = m; 900 inp->pkt_last = m; 901 } else { 902 inp->pkt_last = inp->pkt = m; 903 } 904 if ( 905 /* FreeBSD and MacOSX uses a flag passed */ 906 ((flags & PRUS_MORETOCOME) == 0) 907 ) { 908 /* 909 * note with the current version this code will only be used 910 * by OpenBSD, NetBSD and FreeBSD have methods for 911 * re-defining sosend() to use sctp_sosend(). One can 912 * optionaly switch back to this code (by changing back the 913 * defininitions but this is not advisable. 914 */ 915 int ret; 916 917 ret = sctp_output(inp, inp->pkt, addr, inp->control, p, flags); 918 inp->pkt = NULL; 919 inp->control = NULL; 920 return (ret); 921 } else { 922 return (0); 923 } 924} 925 926static int 927sctp6_connect(struct socket *so, struct sockaddr *addr, struct thread *p) 928{ 929 uint32_t vrf_id; 930 int error = 0; 931 struct sctp_inpcb *inp; 932 struct in6pcb *inp6; 933 struct sctp_tcb *stcb; 934 935#ifdef INET 936 struct sockaddr_in6 *sin6; 937 struct sockaddr_storage ss; 938 939#endif /* INET */ 940 941 inp6 = (struct in6pcb *)so->so_pcb; 942 inp = (struct sctp_inpcb *)so->so_pcb; 943 if (inp == 0) { 944 SCTP_LTRACE_ERR_RET(inp, NULL, NULL, SCTP_FROM_SCTP6_USRREQ, ECONNRESET); 945 return (ECONNRESET); /* I made the same as TCP since we are 946 * not setup? */ 947 } 948 if (addr == NULL) { 949 SCTP_LTRACE_ERR_RET(inp, NULL, NULL, SCTP_FROM_SCTP6_USRREQ, EINVAL); 950 return (EINVAL); 951 } 952 if ((addr->sa_family == AF_INET6) && (addr->sa_len != sizeof(struct sockaddr_in6))) { 953 SCTP_LTRACE_ERR_RET(inp, NULL, NULL, SCTP_FROM_SCTP6_USRREQ, EINVAL); 954 return (EINVAL); 955 } 956 if ((addr->sa_family == AF_INET) && (addr->sa_len != sizeof(struct sockaddr_in))) { 957 SCTP_LTRACE_ERR_RET(inp, NULL, NULL, SCTP_FROM_SCTP6_USRREQ, EINVAL); 958 return (EINVAL); 959 } 960 vrf_id = inp->def_vrf_id; 961 SCTP_ASOC_CREATE_LOCK(inp); 962 SCTP_INP_RLOCK(inp); 963 if ((inp->sctp_flags & SCTP_PCB_FLAGS_UNBOUND) == 964 SCTP_PCB_FLAGS_UNBOUND) { 965 /* Bind a ephemeral port */ 966 SCTP_INP_RUNLOCK(inp); 967 error = sctp6_bind(so, NULL, p); 968 if (error) { 969 SCTP_ASOC_CREATE_UNLOCK(inp); 970 971 return (error); 972 } 973 SCTP_INP_RLOCK(inp); 974 } 975 if ((inp->sctp_flags & SCTP_PCB_FLAGS_TCPTYPE) && 976 (inp->sctp_flags & SCTP_PCB_FLAGS_CONNECTED)) { 977 /* We are already connected AND the TCP model */ 978 SCTP_INP_RUNLOCK(inp); 979 SCTP_ASOC_CREATE_UNLOCK(inp); 980 SCTP_LTRACE_ERR_RET(inp, NULL, NULL, SCTP_FROM_SCTP6_USRREQ, EADDRINUSE); 981 return (EADDRINUSE); 982 } 983#ifdef INET 984 sin6 = (struct sockaddr_in6 *)addr; 985 if (SCTP_IPV6_V6ONLY(inp6)) { 986 /* 987 * if IPV6_V6ONLY flag, ignore connections destined to a v4 988 * addr or v4-mapped addr 989 */ 990 if (addr->sa_family == AF_INET) { 991 SCTP_INP_RUNLOCK(inp); 992 SCTP_ASOC_CREATE_UNLOCK(inp); 993 SCTP_LTRACE_ERR_RET(inp, NULL, NULL, SCTP_FROM_SCTP6_USRREQ, EINVAL); 994 return EINVAL; 995 } 996 if (IN6_IS_ADDR_V4MAPPED(&sin6->sin6_addr)) { 997 SCTP_INP_RUNLOCK(inp); 998 SCTP_ASOC_CREATE_UNLOCK(inp); 999 SCTP_LTRACE_ERR_RET(inp, NULL, NULL, SCTP_FROM_SCTP6_USRREQ, EINVAL); 1000 return EINVAL; 1001 } 1002 } 1003 if (IN6_IS_ADDR_V4MAPPED(&sin6->sin6_addr)) { 1004 if (!MODULE_GLOBAL(ip6_v6only)) { 1005 /* convert v4-mapped into v4 addr */ 1006 in6_sin6_2_sin((struct sockaddr_in *)&ss, sin6); 1007 addr = (struct sockaddr *)&ss; 1008 } else { 1009 /* mapped addresses aren't enabled */ 1010 SCTP_INP_RUNLOCK(inp); 1011 SCTP_ASOC_CREATE_UNLOCK(inp); 1012 SCTP_LTRACE_ERR_RET(inp, NULL, NULL, SCTP_FROM_SCTP6_USRREQ, EINVAL); 1013 return EINVAL; 1014 } 1015 } else 1016#endif /* INET */ 1017 addr = addr; /* for true v6 address case */ 1018 1019 /* Now do we connect? */ 1020 if (inp->sctp_flags & SCTP_PCB_FLAGS_CONNECTED) { 1021 stcb = LIST_FIRST(&inp->sctp_asoc_list); 1022 if (stcb) { 1023 SCTP_TCB_UNLOCK(stcb); 1024 } 1025 SCTP_INP_RUNLOCK(inp); 1026 } else { 1027 SCTP_INP_RUNLOCK(inp); 1028 SCTP_INP_WLOCK(inp); 1029 SCTP_INP_INCR_REF(inp); 1030 SCTP_INP_WUNLOCK(inp); 1031 stcb = sctp_findassociation_ep_addr(&inp, addr, NULL, NULL, NULL); 1032 if (stcb == NULL) { 1033 SCTP_INP_WLOCK(inp); 1034 SCTP_INP_DECR_REF(inp); 1035 SCTP_INP_WUNLOCK(inp); 1036 } 1037 } 1038 1039 if (stcb != NULL) { 1040 /* Already have or am bring up an association */ 1041 SCTP_ASOC_CREATE_UNLOCK(inp); 1042 SCTP_TCB_UNLOCK(stcb); 1043 SCTP_LTRACE_ERR_RET(inp, NULL, NULL, SCTP_FROM_SCTP6_USRREQ, EALREADY); 1044 return (EALREADY); 1045 } 1046 /* We are GOOD to go */ 1047 stcb = sctp_aloc_assoc(inp, addr, &error, 0, vrf_id, p); 1048 SCTP_ASOC_CREATE_UNLOCK(inp); 1049 if (stcb == NULL) { 1050 /* Gak! no memory */ 1051 return (error); 1052 } 1053 if (stcb->sctp_ep->sctp_flags & SCTP_PCB_FLAGS_TCPTYPE) { 1054 stcb->sctp_ep->sctp_flags |= SCTP_PCB_FLAGS_CONNECTED; 1055 /* Set the connected flag so we can queue data */ 1056 soisconnecting(so); 1057 } 1058 stcb->asoc.state = SCTP_STATE_COOKIE_WAIT; 1059 (void)SCTP_GETTIME_TIMEVAL(&stcb->asoc.time_entered); 1060 1061 /* initialize authentication parameters for the assoc */ 1062 sctp_initialize_auth_params(inp, stcb); 1063 1064 sctp_send_initiate(inp, stcb, SCTP_SO_LOCKED); 1065 SCTP_TCB_UNLOCK(stcb); 1066 return error; 1067} 1068 1069static int 1070sctp6_getaddr(struct socket *so, struct sockaddr **addr) 1071{ 1072 struct sockaddr_in6 *sin6; 1073 struct sctp_inpcb *inp; 1074 uint32_t vrf_id; 1075 struct sctp_ifa *sctp_ifa; 1076 1077 int error; 1078 1079 /* 1080 * Do the malloc first in case it blocks. 1081 */ 1082 SCTP_MALLOC_SONAME(sin6, struct sockaddr_in6 *, sizeof *sin6); 1083 if (sin6 == NULL) 1084 return ENOMEM; 1085 sin6->sin6_family = AF_INET6; 1086 sin6->sin6_len = sizeof(*sin6); 1087 1088 inp = (struct sctp_inpcb *)so->so_pcb; 1089 if (inp == NULL) { 1090 SCTP_FREE_SONAME(sin6); 1091 SCTP_LTRACE_ERR_RET(inp, NULL, NULL, SCTP_FROM_SCTP6_USRREQ, ECONNRESET); 1092 return ECONNRESET; 1093 } 1094 SCTP_INP_RLOCK(inp); 1095 sin6->sin6_port = inp->sctp_lport; 1096 if (inp->sctp_flags & SCTP_PCB_FLAGS_BOUNDALL) { 1097 /* For the bound all case you get back 0 */ 1098 if (inp->sctp_flags & SCTP_PCB_FLAGS_CONNECTED) { 1099 struct sctp_tcb *stcb; 1100 struct sockaddr_in6 *sin_a6; 1101 struct sctp_nets *net; 1102 int fnd; 1103 1104 stcb = LIST_FIRST(&inp->sctp_asoc_list); 1105 if (stcb == NULL) { 1106 goto notConn6; 1107 } 1108 fnd = 0; 1109 sin_a6 = NULL; 1110 TAILQ_FOREACH(net, &stcb->asoc.nets, sctp_next) { 1111 sin_a6 = (struct sockaddr_in6 *)&net->ro._l_addr; 1112 if (sin_a6 == NULL) 1113 /* this will make coverity happy */ 1114 continue; 1115 1116 if (sin_a6->sin6_family == AF_INET6) { 1117 fnd = 1; 1118 break; 1119 } 1120 } 1121 if ((!fnd) || (sin_a6 == NULL)) { 1122 /* punt */ 1123 goto notConn6; 1124 } 1125 vrf_id = inp->def_vrf_id; 1126 sctp_ifa = sctp_source_address_selection(inp, stcb, (sctp_route_t *) & net->ro, net, 0, vrf_id); 1127 if (sctp_ifa) { 1128 sin6->sin6_addr = sctp_ifa->address.sin6.sin6_addr; 1129 } 1130 } else { 1131 /* For the bound all case you get back 0 */ 1132 notConn6: 1133 memset(&sin6->sin6_addr, 0, sizeof(sin6->sin6_addr)); 1134 } 1135 } else { 1136 /* Take the first IPv6 address in the list */ 1137 struct sctp_laddr *laddr; 1138 int fnd = 0; 1139 1140 LIST_FOREACH(laddr, &inp->sctp_addr_list, sctp_nxt_addr) { 1141 if (laddr->ifa->address.sa.sa_family == AF_INET6) { 1142 struct sockaddr_in6 *sin_a; 1143 1144 sin_a = (struct sockaddr_in6 *)&laddr->ifa->address.sin6; 1145 sin6->sin6_addr = sin_a->sin6_addr; 1146 fnd = 1; 1147 break; 1148 } 1149 } 1150 if (!fnd) { 1151 SCTP_FREE_SONAME(sin6); 1152 SCTP_INP_RUNLOCK(inp); 1153 SCTP_LTRACE_ERR_RET(inp, NULL, NULL, SCTP_FROM_SCTP6_USRREQ, ENOENT); 1154 return ENOENT; 1155 } 1156 } 1157 SCTP_INP_RUNLOCK(inp); 1158 /* Scoping things for v6 */ 1159 if ((error = sa6_recoverscope(sin6)) != 0) { 1160 SCTP_FREE_SONAME(sin6); 1161 return (error); 1162 } 1163 (*addr) = (struct sockaddr *)sin6; 1164 return (0); 1165} 1166 1167static int 1168sctp6_peeraddr(struct socket *so, struct sockaddr **addr) 1169{ 1170 struct sockaddr_in6 *sin6 = (struct sockaddr_in6 *)*addr; 1171 int fnd; 1172 struct sockaddr_in6 *sin_a6; 1173 struct sctp_inpcb *inp; 1174 struct sctp_tcb *stcb; 1175 struct sctp_nets *net; 1176 1177 int error; 1178 1179 /* 1180 * Do the malloc first in case it blocks. 1181 */ 1182 inp = (struct sctp_inpcb *)so->so_pcb; 1183 if ((inp->sctp_flags & SCTP_PCB_FLAGS_CONNECTED) == 0) { 1184 /* UDP type and listeners will drop out here */ 1185 SCTP_LTRACE_ERR_RET(inp, NULL, NULL, SCTP_FROM_SCTP6_USRREQ, ENOTCONN); 1186 return (ENOTCONN); 1187 } 1188 SCTP_MALLOC_SONAME(sin6, struct sockaddr_in6 *, sizeof *sin6); 1189 if (sin6 == NULL) 1190 return (ENOMEM); 1191 sin6->sin6_family = AF_INET6; 1192 sin6->sin6_len = sizeof(*sin6); 1193 1194 /* We must recapture incase we blocked */ 1195 inp = (struct sctp_inpcb *)so->so_pcb; 1196 if (inp == NULL) { 1197 SCTP_FREE_SONAME(sin6); 1198 SCTP_LTRACE_ERR_RET(inp, NULL, NULL, SCTP_FROM_SCTP6_USRREQ, ECONNRESET); 1199 return ECONNRESET; 1200 } 1201 SCTP_INP_RLOCK(inp); 1202 stcb = LIST_FIRST(&inp->sctp_asoc_list); 1203 if (stcb) { 1204 SCTP_TCB_LOCK(stcb); 1205 } 1206 SCTP_INP_RUNLOCK(inp); 1207 if (stcb == NULL) { 1208 SCTP_FREE_SONAME(sin6); 1209 SCTP_LTRACE_ERR_RET(inp, NULL, NULL, SCTP_FROM_SCTP6_USRREQ, ECONNRESET); 1210 return ECONNRESET; 1211 } 1212 fnd = 0; 1213 TAILQ_FOREACH(net, &stcb->asoc.nets, sctp_next) { 1214 sin_a6 = (struct sockaddr_in6 *)&net->ro._l_addr; 1215 if (sin_a6->sin6_family == AF_INET6) { 1216 fnd = 1; 1217 sin6->sin6_port = stcb->rport; 1218 sin6->sin6_addr = sin_a6->sin6_addr; 1219 break; 1220 } 1221 } 1222 SCTP_TCB_UNLOCK(stcb); 1223 if (!fnd) { 1224 /* No IPv4 address */ 1225 SCTP_FREE_SONAME(sin6); 1226 SCTP_LTRACE_ERR_RET(inp, NULL, NULL, SCTP_FROM_SCTP6_USRREQ, ENOENT); 1227 return ENOENT; 1228 } 1229 if ((error = sa6_recoverscope(sin6)) != 0) 1230 return (error); 1231 *addr = (struct sockaddr *)sin6; 1232 return (0); 1233} 1234 1235static int 1236sctp6_in6getaddr(struct socket *so, struct sockaddr **nam) 1237{ 1238 struct sockaddr *addr; 1239 struct in6pcb *inp6 = sotoin6pcb(so); 1240 int error; 1241 1242 if (inp6 == NULL) { 1243 SCTP_LTRACE_ERR_RET(NULL, NULL, NULL, SCTP_FROM_SCTP6_USRREQ, EINVAL); 1244 return EINVAL; 1245 } 1246 /* allow v6 addresses precedence */ 1247 error = sctp6_getaddr(so, nam); 1248 if (error) { 1249 /* try v4 next if v6 failed */ 1250 error = sctp_ingetaddr(so, nam); 1251 if (error) { 1252 return (error); 1253 } 1254 addr = *nam; 1255 /* if I'm V6ONLY, convert it to v4-mapped */ 1256 if (SCTP_IPV6_V6ONLY(inp6)) { 1257 struct sockaddr_in6 sin6; 1258 1259 in6_sin_2_v4mapsin6((struct sockaddr_in *)addr, &sin6); 1260 memcpy(addr, &sin6, sizeof(struct sockaddr_in6)); 1261 1262 } 1263 } 1264 return (error); 1265} 1266 1267 1268static int 1269sctp6_getpeeraddr(struct socket *so, struct sockaddr **nam) 1270{ 1271 struct sockaddr *addr = *nam; 1272 struct in6pcb *inp6 = sotoin6pcb(so); 1273 int error; 1274 1275 if (inp6 == NULL) { 1276 SCTP_LTRACE_ERR_RET(NULL, NULL, NULL, SCTP_FROM_SCTP6_USRREQ, EINVAL); 1277 return EINVAL; 1278 } 1279 /* allow v6 addresses precedence */ 1280 error = sctp6_peeraddr(so, nam); 1281 if (error) { 1282 /* try v4 next if v6 failed */ 1283 error = sctp_peeraddr(so, nam); 1284 if (error) { 1285 return (error); 1286 } 1287 /* if I'm V6ONLY, convert it to v4-mapped */ 1288 if (SCTP_IPV6_V6ONLY(inp6)) { 1289 struct sockaddr_in6 sin6; 1290 1291 in6_sin_2_v4mapsin6((struct sockaddr_in *)addr, &sin6); 1292 memcpy(addr, &sin6, sizeof(struct sockaddr_in6)); 1293 } 1294 } 1295 return error; 1296} 1297 1298struct pr_usrreqs sctp6_usrreqs = { 1299 .pru_abort = sctp6_abort, 1300 .pru_accept = sctp_accept, 1301 .pru_attach = sctp6_attach, 1302 .pru_bind = sctp6_bind, 1303 .pru_connect = sctp6_connect, 1304 .pru_control = in6_control, 1305 .pru_close = sctp6_close, 1306 .pru_detach = sctp6_close, 1307 .pru_sopoll = sopoll_generic, 1308 .pru_flush = sctp_flush, 1309 .pru_disconnect = sctp6_disconnect, 1310 .pru_listen = sctp_listen, 1311 .pru_peeraddr = sctp6_getpeeraddr, 1312 .pru_send = sctp6_send, 1313 .pru_shutdown = sctp_shutdown, 1314 .pru_sockaddr = sctp6_in6getaddr, 1315 .pru_sosend = sctp_sosend, 1316 .pru_soreceive = sctp_soreceive 1317}; 1318