sctp6_usrreq.c revision 237888
1/*- 2 * Copyright (c) 2001-2007, by Cisco Systems, Inc. All rights reserved. 3 * Copyright (c) 2008-2011, by Randall Stewart. All rights reserved. 4 * Copyright (c) 2008-2011, by Michael Tuexen. All rights reserved. 5 * 6 * Redistribution and use in source and binary forms, with or without 7 * modification, are permitted provided that the following conditions are met: 8 * 9 * a) Redistributions of source code must retain the above copyright notice, 10 * this list of conditions and the following disclaimer. 11 * 12 * b) Redistributions in binary form must reproduce the above copyright 13 * notice, this list of conditions and the following disclaimer in 14 * the documentation and/or other materials provided with the distribution. 15 * 16 * c) Neither the name of Cisco Systems, Inc. nor the names of its 17 * contributors may be used to endorse or promote products derived 18 * from this software without specific prior written permission. 19 * 20 * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS 21 * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, 22 * THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 23 * ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR CONTRIBUTORS BE 24 * LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR 25 * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF 26 * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS 27 * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN 28 * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) 29 * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF 30 * THE POSSIBILITY OF SUCH DAMAGE. 31 */ 32/* $KAME: sctp6_usrreq.c,v 1.38 2005/08/24 08:08:56 suz Exp $ */ 33 34#include <sys/cdefs.h> 35__FBSDID("$FreeBSD: stable/9/sys/netinet6/sctp6_usrreq.c 237888 2012-07-01 07:39:37Z tuexen $"); 36 37#include <netinet/sctp_os.h> 38#include <sys/proc.h> 39#include <netinet/sctp_pcb.h> 40#include <netinet/sctp_header.h> 41#include <netinet/sctp_var.h> 42#if defined(INET6) 43#include <netinet6/sctp6_var.h> 44#endif 45#include <netinet/sctp_sysctl.h> 46#include <netinet/sctp_output.h> 47#include <netinet/sctp_uio.h> 48#include <netinet/sctp_asconf.h> 49#include <netinet/sctputil.h> 50#include <netinet/sctp_indata.h> 51#include <netinet/sctp_timer.h> 52#include <netinet/sctp_auth.h> 53#include <netinet/sctp_input.h> 54#include <netinet/sctp_output.h> 55#include <netinet/sctp_bsd_addr.h> 56#include <netinet/sctp_crc32.h> 57#include <netinet/udp.h> 58 59#ifdef IPSEC 60#include <netipsec/ipsec.h> 61#if defined(INET6) 62#include <netipsec/ipsec6.h> 63#endif /* INET6 */ 64#endif /* IPSEC */ 65 66extern struct protosw inetsw[]; 67 68int 69sctp6_input(struct mbuf **i_pak, int *offp, int proto) 70{ 71 struct mbuf *m; 72 struct ip6_hdr *ip6; 73 struct sctphdr *sh; 74 struct sctp_inpcb *in6p = NULL; 75 struct sctp_nets *net; 76 int refcount_up = 0; 77 uint32_t vrf_id = 0; 78 79#ifdef IPSEC 80 struct inpcb *in6p_ip; 81 82#endif 83 struct sctp_chunkhdr *ch; 84 int length, offset, iphlen; 85 uint8_t ecn_bits; 86 struct sctp_tcb *stcb = NULL; 87 int pkt_len = 0; 88 89#if !defined(SCTP_WITH_NO_CSUM) 90 uint32_t check, calc_check; 91 92#endif 93 int off = *offp; 94 uint16_t port = 0; 95 96 /* get the VRF and table id's */ 97 if (SCTP_GET_PKT_VRFID(*i_pak, vrf_id)) { 98 SCTP_RELEASE_PKT(*i_pak); 99 return (-1); 100 } 101 m = SCTP_HEADER_TO_CHAIN(*i_pak); 102 pkt_len = SCTP_HEADER_LEN((*i_pak)); 103 104#ifdef SCTP_PACKET_LOGGING 105 sctp_packet_log(m, pkt_len); 106#endif 107 ip6 = mtod(m, struct ip6_hdr *); 108 /* Ensure that (sctphdr + sctp_chunkhdr) in a row. */ 109 IP6_EXTHDR_GET(sh, struct sctphdr *, m, off, 110 (int)(sizeof(*sh) + sizeof(*ch))); 111 if (sh == NULL) { 112 SCTP_STAT_INCR(sctps_hdrops); 113 return (IPPROTO_DONE); 114 } 115 ch = (struct sctp_chunkhdr *)((caddr_t)sh + sizeof(struct sctphdr)); 116 iphlen = off; 117 offset = iphlen + sizeof(*sh) + sizeof(*ch); 118 SCTPDBG(SCTP_DEBUG_INPUT1, 119 "sctp6_input() length:%d iphlen:%d\n", pkt_len, iphlen); 120 121 122#if defined(NFAITH) && NFAITH > 0 123 124 if (faithprefix_p != NULL && (*faithprefix_p) (&ip6->ip6_dst)) { 125 /* XXX send icmp6 host/port unreach? */ 126 goto bad; 127 } 128#endif /* NFAITH defined and > 0 */ 129 SCTP_STAT_INCR(sctps_recvpackets); 130 SCTP_STAT_INCR_COUNTER64(sctps_inpackets); 131 SCTPDBG(SCTP_DEBUG_INPUT1, "V6 input gets a packet iphlen:%d pktlen:%d\n", 132 iphlen, pkt_len); 133 if (IN6_IS_ADDR_MULTICAST(&ip6->ip6_dst)) { 134 /* No multi-cast support in SCTP */ 135 goto bad; 136 } 137 /* destination port of 0 is illegal, based on RFC2960. */ 138 if (sh->dest_port == 0) 139 goto bad; 140 141 SCTPDBG(SCTP_DEBUG_CRCOFFLOAD, 142 "sctp_input(): Packet of length %d received on %s with csum_flags 0x%x.\n", 143 m->m_pkthdr.len, 144 if_name(m->m_pkthdr.rcvif), 145 m->m_pkthdr.csum_flags); 146#if defined(SCTP_WITH_NO_CSUM) 147 SCTP_STAT_INCR(sctps_recvnocrc); 148#else 149 if (m->m_pkthdr.csum_flags & CSUM_SCTP_VALID) { 150 SCTP_STAT_INCR(sctps_recvhwcrc); 151 goto sctp_skip_csum; 152 } 153 check = sh->checksum; /* save incoming checksum */ 154 if ((check == 0) && (SCTP_BASE_SYSCTL(sctp_no_csum_on_loopback)) && 155 (IN6_ARE_ADDR_EQUAL(&ip6->ip6_src, &ip6->ip6_dst))) { 156 SCTP_STAT_INCR(sctps_recvnocrc); 157 goto sctp_skip_csum; 158 } 159 sh->checksum = 0; /* prepare for calc */ 160 calc_check = sctp_calculate_cksum(m, iphlen); 161 SCTP_STAT_INCR(sctps_recvswcrc); 162 if (calc_check != check) { 163 SCTPDBG(SCTP_DEBUG_INPUT1, "Bad CSUM on SCTP packet calc_check:%x check:%x m:%p phlen:%d\n", 164 calc_check, check, m, iphlen); 165 stcb = sctp_findassociation_addr(m, offset - sizeof(*ch), 166 sh, ch, &in6p, &net, vrf_id); 167 if ((net) && (port)) { 168 if (net->port == 0) { 169 sctp_pathmtu_adjustment(stcb, net->mtu - sizeof(struct udphdr)); 170 } 171 net->port = port; 172 } 173 if ((net != NULL) && (m->m_flags & M_FLOWID)) { 174 net->flowid = m->m_pkthdr.flowid; 175#ifdef INVARIANTS 176 net->flowidset = 1; 177#endif 178 } 179 /* in6p's ref-count increased && stcb locked */ 180 if ((in6p) && (stcb)) { 181 sctp_send_packet_dropped(stcb, net, m, iphlen, 1); 182 sctp_chunk_output((struct sctp_inpcb *)in6p, stcb, SCTP_OUTPUT_FROM_INPUT_ERROR, SCTP_SO_NOT_LOCKED); 183 } else if ((in6p != NULL) && (stcb == NULL)) { 184 refcount_up = 1; 185 } 186 SCTP_STAT_INCR(sctps_badsum); 187 SCTP_STAT_INCR_COUNTER32(sctps_checksumerrors); 188 goto bad; 189 } 190 sh->checksum = calc_check; 191 192sctp_skip_csum: 193#endif 194 net = NULL; 195 /* 196 * Locate pcb and tcb for datagram sctp_findassociation_addr() wants 197 * IP/SCTP/first chunk header... 198 */ 199 stcb = sctp_findassociation_addr(m, offset - sizeof(*ch), 200 sh, ch, &in6p, &net, vrf_id); 201 if ((net) && (port)) { 202 if (net->port == 0) { 203 sctp_pathmtu_adjustment(stcb, net->mtu - sizeof(struct udphdr)); 204 } 205 net->port = port; 206 } 207 if ((net != NULL) && (m->m_flags & M_FLOWID)) { 208 net->flowid = m->m_pkthdr.flowid; 209#ifdef INVARIANTS 210 net->flowidset = 1; 211#endif 212 } 213 /* in6p's ref-count increased */ 214 if (in6p == NULL) { 215 struct sctp_init_chunk *init_chk, chunk_buf; 216 217 SCTP_STAT_INCR(sctps_noport); 218 if (ch->chunk_type == SCTP_INITIATION) { 219 /* 220 * we do a trick here to get the INIT tag, dig in 221 * and get the tag from the INIT and put it in the 222 * common header. 223 */ 224 init_chk = (struct sctp_init_chunk *)sctp_m_getptr(m, 225 iphlen + sizeof(*sh), sizeof(*init_chk), 226 (uint8_t *) & chunk_buf); 227 if (init_chk) 228 sh->v_tag = init_chk->init.initiate_tag; 229 else 230 sh->v_tag = 0; 231 } 232 if (ch->chunk_type == SCTP_SHUTDOWN_ACK) { 233 sctp_send_shutdown_complete2(m, sh, vrf_id, port); 234 goto bad; 235 } 236 if (ch->chunk_type == SCTP_SHUTDOWN_COMPLETE) { 237 goto bad; 238 } 239 if (ch->chunk_type != SCTP_ABORT_ASSOCIATION) { 240 if ((SCTP_BASE_SYSCTL(sctp_blackhole) == 0) || 241 ((SCTP_BASE_SYSCTL(sctp_blackhole) == 1) && 242 (ch->chunk_type != SCTP_INIT))) { 243 sctp_send_abort(m, iphlen, sh, 0, NULL, vrf_id, port); 244 } 245 } 246 goto bad; 247 } else if (stcb == NULL) { 248 refcount_up = 1; 249 } 250#ifdef IPSEC 251 /* 252 * Check AH/ESP integrity. 253 */ 254 in6p_ip = (struct inpcb *)in6p; 255 if (in6p_ip && (ipsec6_in_reject(m, in6p_ip))) { 256/* XXX */ 257 MODULE_GLOBAL(ipsec6stat).in_polvio++; 258 goto bad; 259 } 260#endif /* IPSEC */ 261 262 /* 263 * CONTROL chunk processing 264 */ 265 offset -= sizeof(*ch); 266 ecn_bits = ((ntohl(ip6->ip6_flow) >> 20) & 0x000000ff); 267 268 /* Length now holds the total packet length payload + iphlen */ 269 length = ntohs(ip6->ip6_plen) + iphlen; 270 271 /* sa_ignore NO_NULL_CHK */ 272 sctp_common_input_processing(&m, iphlen, offset, length, sh, ch, 273 in6p, stcb, net, ecn_bits, vrf_id, port); 274 /* inp's ref-count reduced && stcb unlocked */ 275 /* XXX this stuff below gets moved to appropriate parts later... */ 276 if (m) 277 sctp_m_freem(m); 278 if ((in6p) && refcount_up) { 279 /* reduce ref-count */ 280 SCTP_INP_WLOCK(in6p); 281 SCTP_INP_DECR_REF(in6p); 282 SCTP_INP_WUNLOCK(in6p); 283 } 284 return (IPPROTO_DONE); 285 286bad: 287 if (stcb) { 288 SCTP_TCB_UNLOCK(stcb); 289 } 290 if ((in6p) && refcount_up) { 291 /* reduce ref-count */ 292 SCTP_INP_WLOCK(in6p); 293 SCTP_INP_DECR_REF(in6p); 294 SCTP_INP_WUNLOCK(in6p); 295 } 296 if (m) 297 sctp_m_freem(m); 298 return (IPPROTO_DONE); 299} 300 301 302static void 303sctp6_notify_mbuf(struct sctp_inpcb *inp, struct icmp6_hdr *icmp6, 304 struct sctphdr *sh, struct sctp_tcb *stcb, struct sctp_nets *net) 305{ 306 uint32_t nxtsz; 307 308 if ((inp == NULL) || (stcb == NULL) || (net == NULL) || 309 (icmp6 == NULL) || (sh == NULL)) { 310 goto out; 311 } 312 /* First do we even look at it? */ 313 if (ntohl(sh->v_tag) != (stcb->asoc.peer_vtag)) 314 goto out; 315 316 if (icmp6->icmp6_type != ICMP6_PACKET_TOO_BIG) { 317 /* not PACKET TO BIG */ 318 goto out; 319 } 320 /* 321 * ok we need to look closely. We could even get smarter and look at 322 * anyone that we sent to in case we get a different ICMP that tells 323 * us there is no way to reach a host, but for this impl, all we 324 * care about is MTU discovery. 325 */ 326 nxtsz = ntohl(icmp6->icmp6_mtu); 327 /* Stop any PMTU timer */ 328 sctp_timer_stop(SCTP_TIMER_TYPE_PATHMTURAISE, inp, stcb, NULL, SCTP_FROM_SCTP6_USRREQ + SCTP_LOC_1); 329 330 /* Adjust destination size limit */ 331 if (net->mtu > nxtsz) { 332 net->mtu = nxtsz; 333 if (net->port) { 334 net->mtu -= sizeof(struct udphdr); 335 } 336 } 337 /* now what about the ep? */ 338 if (stcb->asoc.smallest_mtu > nxtsz) { 339 struct sctp_tmit_chunk *chk; 340 341 /* Adjust that too */ 342 stcb->asoc.smallest_mtu = nxtsz; 343 /* now off to subtract IP_DF flag if needed */ 344 345 TAILQ_FOREACH(chk, &stcb->asoc.send_queue, sctp_next) { 346 if ((uint32_t) (chk->send_size + IP_HDR_SIZE) > nxtsz) { 347 chk->flags |= CHUNK_FLAGS_FRAGMENT_OK; 348 } 349 } 350 TAILQ_FOREACH(chk, &stcb->asoc.sent_queue, sctp_next) { 351 if ((uint32_t) (chk->send_size + IP_HDR_SIZE) > nxtsz) { 352 /* 353 * For this guy we also mark for immediate 354 * resend since we sent to big of chunk 355 */ 356 chk->flags |= CHUNK_FLAGS_FRAGMENT_OK; 357 if (chk->sent != SCTP_DATAGRAM_RESEND) 358 stcb->asoc.sent_queue_retran_cnt++; 359 chk->sent = SCTP_DATAGRAM_RESEND; 360 chk->rec.data.doing_fast_retransmit = 0; 361 362 chk->sent = SCTP_DATAGRAM_RESEND; 363 /* Clear any time so NO RTT is being done */ 364 chk->sent_rcv_time.tv_sec = 0; 365 chk->sent_rcv_time.tv_usec = 0; 366 stcb->asoc.total_flight -= chk->send_size; 367 net->flight_size -= chk->send_size; 368 } 369 } 370 } 371 sctp_timer_start(SCTP_TIMER_TYPE_PATHMTURAISE, inp, stcb, NULL); 372out: 373 if (stcb) { 374 SCTP_TCB_UNLOCK(stcb); 375 } 376} 377 378 379void 380sctp6_notify(struct sctp_inpcb *inp, 381 struct icmp6_hdr *icmph, 382 struct sctphdr *sh, 383 struct sockaddr *to, 384 struct sctp_tcb *stcb, 385 struct sctp_nets *net) 386{ 387#if defined (__APPLE__) || defined(SCTP_SO_LOCK_TESTING) 388 struct socket *so; 389 390#endif 391 392 /* protection */ 393 if ((inp == NULL) || (stcb == NULL) || (net == NULL) || 394 (sh == NULL) || (to == NULL)) { 395 if (stcb) 396 SCTP_TCB_UNLOCK(stcb); 397 return; 398 } 399 /* First job is to verify the vtag matches what I would send */ 400 if (ntohl(sh->v_tag) != (stcb->asoc.peer_vtag)) { 401 SCTP_TCB_UNLOCK(stcb); 402 return; 403 } 404 if (icmph->icmp6_type != ICMP_UNREACH) { 405 /* We only care about unreachable */ 406 SCTP_TCB_UNLOCK(stcb); 407 return; 408 } 409 if ((icmph->icmp6_code == ICMP_UNREACH_NET) || 410 (icmph->icmp6_code == ICMP_UNREACH_HOST) || 411 (icmph->icmp6_code == ICMP_UNREACH_NET_UNKNOWN) || 412 (icmph->icmp6_code == ICMP_UNREACH_HOST_UNKNOWN) || 413 (icmph->icmp6_code == ICMP_UNREACH_ISOLATED) || 414 (icmph->icmp6_code == ICMP_UNREACH_NET_PROHIB) || 415 (icmph->icmp6_code == ICMP_UNREACH_HOST_PROHIB) || 416 (icmph->icmp6_code == ICMP_UNREACH_FILTER_PROHIB)) { 417 418 /* 419 * Hmm reachablity problems we must examine closely. If its 420 * not reachable, we may have lost a network. Or if there is 421 * NO protocol at the other end named SCTP. well we consider 422 * it a OOTB abort. 423 */ 424 if (net->dest_state & SCTP_ADDR_REACHABLE) { 425 /* Ok that destination is NOT reachable */ 426 net->dest_state &= ~SCTP_ADDR_REACHABLE; 427 net->dest_state &= ~SCTP_ADDR_PF; 428 sctp_ulp_notify(SCTP_NOTIFY_INTERFACE_DOWN, 429 stcb, 0, (void *)net, SCTP_SO_NOT_LOCKED); 430 } 431 SCTP_TCB_UNLOCK(stcb); 432 } else if ((icmph->icmp6_code == ICMP_UNREACH_PROTOCOL) || 433 (icmph->icmp6_code == ICMP_UNREACH_PORT)) { 434 /* 435 * Here the peer is either playing tricks on us, including 436 * an address that belongs to someone who does not support 437 * SCTP OR was a userland implementation that shutdown and 438 * now is dead. In either case treat it like a OOTB abort 439 * with no TCB 440 */ 441 sctp_abort_notification(stcb, 1, 0, NULL, SCTP_SO_NOT_LOCKED); 442#if defined (__APPLE__) || defined(SCTP_SO_LOCK_TESTING) 443 so = SCTP_INP_SO(inp); 444 atomic_add_int(&stcb->asoc.refcnt, 1); 445 SCTP_TCB_UNLOCK(stcb); 446 SCTP_SOCKET_LOCK(so, 1); 447 SCTP_TCB_LOCK(stcb); 448 atomic_subtract_int(&stcb->asoc.refcnt, 1); 449#endif 450 (void)sctp_free_assoc(inp, stcb, SCTP_NORMAL_PROC, SCTP_FROM_SCTP_USRREQ + SCTP_LOC_2); 451#if defined (__APPLE__) || defined(SCTP_SO_LOCK_TESTING) 452 SCTP_SOCKET_UNLOCK(so, 1); 453 /* SCTP_TCB_UNLOCK(stcb); MT: I think this is not needed. */ 454#endif 455 /* no need to unlock here, since the TCB is gone */ 456 } else { 457 SCTP_TCB_UNLOCK(stcb); 458 } 459} 460 461 462 463void 464sctp6_ctlinput(int cmd, struct sockaddr *pktdst, void *d) 465{ 466 struct sctphdr sh; 467 struct ip6ctlparam *ip6cp = NULL; 468 uint32_t vrf_id; 469 470 vrf_id = SCTP_DEFAULT_VRFID; 471 472 if (pktdst->sa_family != AF_INET6 || 473 pktdst->sa_len != sizeof(struct sockaddr_in6)) 474 return; 475 476 if ((unsigned)cmd >= PRC_NCMDS) 477 return; 478 if (PRC_IS_REDIRECT(cmd)) { 479 d = NULL; 480 } else if (inet6ctlerrmap[cmd] == 0) { 481 return; 482 } 483 /* if the parameter is from icmp6, decode it. */ 484 if (d != NULL) { 485 ip6cp = (struct ip6ctlparam *)d; 486 } else { 487 ip6cp = (struct ip6ctlparam *)NULL; 488 } 489 490 if (ip6cp) { 491 /* 492 * XXX: We assume that when IPV6 is non NULL, M and OFF are 493 * valid. 494 */ 495 /* check if we can safely examine src and dst ports */ 496 struct sctp_inpcb *inp = NULL; 497 struct sctp_tcb *stcb = NULL; 498 struct sctp_nets *net = NULL; 499 struct sockaddr_in6 final; 500 501 if (ip6cp->ip6c_m == NULL) 502 return; 503 504 bzero(&sh, sizeof(sh)); 505 bzero(&final, sizeof(final)); 506 inp = NULL; 507 net = NULL; 508 m_copydata(ip6cp->ip6c_m, ip6cp->ip6c_off, sizeof(sh), 509 (caddr_t)&sh); 510 ip6cp->ip6c_src->sin6_port = sh.src_port; 511 final.sin6_len = sizeof(final); 512 final.sin6_family = AF_INET6; 513 final.sin6_addr = ((struct sockaddr_in6 *)pktdst)->sin6_addr; 514 final.sin6_port = sh.dest_port; 515 stcb = sctp_findassociation_addr_sa((struct sockaddr *)ip6cp->ip6c_src, 516 (struct sockaddr *)&final, 517 &inp, &net, 1, vrf_id); 518 /* inp's ref-count increased && stcb locked */ 519 if (stcb != NULL && inp && (inp->sctp_socket != NULL)) { 520 if (cmd == PRC_MSGSIZE) { 521 sctp6_notify_mbuf(inp, 522 ip6cp->ip6c_icmp6, 523 &sh, 524 stcb, 525 net); 526 /* inp's ref-count reduced && stcb unlocked */ 527 } else { 528 sctp6_notify(inp, ip6cp->ip6c_icmp6, &sh, 529 (struct sockaddr *)&final, 530 stcb, net); 531 /* inp's ref-count reduced && stcb unlocked */ 532 } 533 } else { 534 if (PRC_IS_REDIRECT(cmd) && inp) { 535 in6_rtchange((struct in6pcb *)inp, 536 inet6ctlerrmap[cmd]); 537 } 538 if (inp) { 539 /* reduce inp's ref-count */ 540 SCTP_INP_WLOCK(inp); 541 SCTP_INP_DECR_REF(inp); 542 SCTP_INP_WUNLOCK(inp); 543 } 544 if (stcb) 545 SCTP_TCB_UNLOCK(stcb); 546 } 547 } 548} 549 550/* 551 * this routine can probably be collasped into the one in sctp_userreq.c 552 * since they do the same thing and now we lookup with a sockaddr 553 */ 554static int 555sctp6_getcred(SYSCTL_HANDLER_ARGS) 556{ 557 struct xucred xuc; 558 struct sockaddr_in6 addrs[2]; 559 struct sctp_inpcb *inp; 560 struct sctp_nets *net; 561 struct sctp_tcb *stcb; 562 int error; 563 uint32_t vrf_id; 564 565 vrf_id = SCTP_DEFAULT_VRFID; 566 567 error = priv_check(req->td, PRIV_NETINET_GETCRED); 568 if (error) 569 return (error); 570 571 if (req->newlen != sizeof(addrs)) { 572 SCTP_LTRACE_ERR_RET(NULL, NULL, NULL, SCTP_FROM_SCTP6_USRREQ, EINVAL); 573 return (EINVAL); 574 } 575 if (req->oldlen != sizeof(struct ucred)) { 576 SCTP_LTRACE_ERR_RET(NULL, NULL, NULL, SCTP_FROM_SCTP6_USRREQ, EINVAL); 577 return (EINVAL); 578 } 579 error = SYSCTL_IN(req, addrs, sizeof(addrs)); 580 if (error) 581 return (error); 582 583 stcb = sctp_findassociation_addr_sa(sin6tosa(&addrs[0]), 584 sin6tosa(&addrs[1]), 585 &inp, &net, 1, vrf_id); 586 if (stcb == NULL || inp == NULL || inp->sctp_socket == NULL) { 587 if ((inp != NULL) && (stcb == NULL)) { 588 /* reduce ref-count */ 589 SCTP_INP_WLOCK(inp); 590 SCTP_INP_DECR_REF(inp); 591 goto cred_can_cont; 592 } 593 SCTP_LTRACE_ERR_RET(inp, NULL, NULL, SCTP_FROM_SCTP6_USRREQ, ENOENT); 594 error = ENOENT; 595 goto out; 596 } 597 SCTP_TCB_UNLOCK(stcb); 598 /* 599 * We use the write lock here, only since in the error leg we need 600 * it. If we used RLOCK, then we would have to 601 * wlock/decr/unlock/rlock. Which in theory could create a hole. 602 * Better to use higher wlock. 603 */ 604 SCTP_INP_WLOCK(inp); 605cred_can_cont: 606 error = cr_canseesocket(req->td->td_ucred, inp->sctp_socket); 607 if (error) { 608 SCTP_INP_WUNLOCK(inp); 609 goto out; 610 } 611 cru2x(inp->sctp_socket->so_cred, &xuc); 612 SCTP_INP_WUNLOCK(inp); 613 error = SYSCTL_OUT(req, &xuc, sizeof(struct xucred)); 614out: 615 return (error); 616} 617 618SYSCTL_PROC(_net_inet6_sctp6, OID_AUTO, getcred, CTLTYPE_OPAQUE | CTLFLAG_RW, 619 0, 0, 620 sctp6_getcred, "S,ucred", "Get the ucred of a SCTP6 connection"); 621 622 623/* This is the same as the sctp_abort() could be made common */ 624static void 625sctp6_abort(struct socket *so) 626{ 627 struct sctp_inpcb *inp; 628 uint32_t flags; 629 630 inp = (struct sctp_inpcb *)so->so_pcb; 631 if (inp == NULL) { 632 SCTP_LTRACE_ERR_RET(inp, NULL, NULL, SCTP_FROM_SCTP6_USRREQ, EINVAL); 633 return; 634 } 635sctp_must_try_again: 636 flags = inp->sctp_flags; 637#ifdef SCTP_LOG_CLOSING 638 sctp_log_closing(inp, NULL, 17); 639#endif 640 if (((flags & SCTP_PCB_FLAGS_SOCKET_GONE) == 0) && 641 (atomic_cmpset_int(&inp->sctp_flags, flags, (flags | SCTP_PCB_FLAGS_SOCKET_GONE | SCTP_PCB_FLAGS_CLOSE_IP)))) { 642#ifdef SCTP_LOG_CLOSING 643 sctp_log_closing(inp, NULL, 16); 644#endif 645 sctp_inpcb_free(inp, SCTP_FREE_SHOULD_USE_ABORT, 646 SCTP_CALLED_AFTER_CMPSET_OFCLOSE); 647 SOCK_LOCK(so); 648 SCTP_SB_CLEAR(so->so_snd); 649 /* 650 * same for the rcv ones, they are only here for the 651 * accounting/select. 652 */ 653 SCTP_SB_CLEAR(so->so_rcv); 654 /* Now null out the reference, we are completely detached. */ 655 so->so_pcb = NULL; 656 SOCK_UNLOCK(so); 657 } else { 658 flags = inp->sctp_flags; 659 if ((flags & SCTP_PCB_FLAGS_SOCKET_GONE) == 0) { 660 goto sctp_must_try_again; 661 } 662 } 663 return; 664} 665 666static int 667sctp6_attach(struct socket *so, int proto SCTP_UNUSED, struct thread *p SCTP_UNUSED) 668{ 669 struct in6pcb *inp6; 670 int error; 671 struct sctp_inpcb *inp; 672 uint32_t vrf_id = SCTP_DEFAULT_VRFID; 673 674 inp = (struct sctp_inpcb *)so->so_pcb; 675 if (inp != NULL) { 676 SCTP_LTRACE_ERR_RET(inp, NULL, NULL, SCTP_FROM_SCTP6_USRREQ, EINVAL); 677 return (EINVAL); 678 } 679 if (so->so_snd.sb_hiwat == 0 || so->so_rcv.sb_hiwat == 0) { 680 error = SCTP_SORESERVE(so, SCTP_BASE_SYSCTL(sctp_sendspace), SCTP_BASE_SYSCTL(sctp_recvspace)); 681 if (error) 682 return (error); 683 } 684 error = sctp_inpcb_alloc(so, vrf_id); 685 if (error) 686 return (error); 687 inp = (struct sctp_inpcb *)so->so_pcb; 688 SCTP_INP_WLOCK(inp); 689 inp->sctp_flags |= SCTP_PCB_FLAGS_BOUND_V6; /* I'm v6! */ 690 inp6 = (struct in6pcb *)inp; 691 692 inp6->inp_vflag |= INP_IPV6; 693 inp6->in6p_hops = -1; /* use kernel default */ 694 inp6->in6p_cksum = -1; /* just to be sure */ 695#ifdef INET 696 /* 697 * XXX: ugly!! IPv4 TTL initialization is necessary for an IPv6 698 * socket as well, because the socket may be bound to an IPv6 699 * wildcard address, which may match an IPv4-mapped IPv6 address. 700 */ 701 inp6->inp_ip_ttl = MODULE_GLOBAL(ip_defttl); 702#endif 703 /* 704 * Hmm what about the IPSEC stuff that is missing here but in 705 * sctp_attach()? 706 */ 707 SCTP_INP_WUNLOCK(inp); 708 return (0); 709} 710 711static int 712sctp6_bind(struct socket *so, struct sockaddr *addr, struct thread *p) 713{ 714 struct sctp_inpcb *inp; 715 struct in6pcb *inp6; 716 int error; 717 718 inp = (struct sctp_inpcb *)so->so_pcb; 719 if (inp == NULL) { 720 SCTP_LTRACE_ERR_RET(inp, NULL, NULL, SCTP_FROM_SCTP6_USRREQ, EINVAL); 721 return (EINVAL); 722 } 723 if (addr) { 724 switch (addr->sa_family) { 725#ifdef INET 726 case AF_INET: 727 if (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 break; 732#endif 733#ifdef INET6 734 case AF_INET6: 735 if (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 break; 740#endif 741 default: 742 SCTP_LTRACE_ERR_RET(inp, NULL, NULL, SCTP_FROM_SCTP6_USRREQ, EINVAL); 743 return (EINVAL); 744 } 745 } 746 inp6 = (struct in6pcb *)inp; 747 inp6->inp_vflag &= ~INP_IPV4; 748 inp6->inp_vflag |= INP_IPV6; 749 if ((addr != NULL) && (SCTP_IPV6_V6ONLY(inp6) == 0)) { 750 switch (addr->sa_family) { 751#ifdef INET 752 case AF_INET: 753 /* binding v4 addr to v6 socket, so reset flags */ 754 inp6->inp_vflag |= INP_IPV4; 755 inp6->inp_vflag &= ~INP_IPV6; 756 break; 757#endif 758#ifdef INET6 759 case AF_INET6: 760 { 761 struct sockaddr_in6 *sin6_p; 762 763 sin6_p = (struct sockaddr_in6 *)addr; 764 765 if (IN6_IS_ADDR_UNSPECIFIED(&sin6_p->sin6_addr)) { 766 inp6->inp_vflag |= INP_IPV4; 767 } 768#ifdef INET 769 if (IN6_IS_ADDR_V4MAPPED(&sin6_p->sin6_addr)) { 770 struct sockaddr_in sin; 771 772 in6_sin6_2_sin(&sin, sin6_p); 773 inp6->inp_vflag |= INP_IPV4; 774 inp6->inp_vflag &= ~INP_IPV6; 775 error = sctp_inpcb_bind(so, (struct sockaddr *)&sin, NULL, p); 776 return (error); 777 } 778#endif 779 break; 780 } 781#endif 782 default: 783 break; 784 } 785 } else if (addr != NULL) { 786 struct sockaddr_in6 *sin6_p; 787 788 /* IPV6_V6ONLY socket */ 789#ifdef INET 790 if (addr->sa_family == AF_INET) { 791 /* can't bind v4 addr to v6 only socket! */ 792 SCTP_LTRACE_ERR_RET(inp, NULL, NULL, SCTP_FROM_SCTP6_USRREQ, EINVAL); 793 return (EINVAL); 794 } 795#endif 796 sin6_p = (struct sockaddr_in6 *)addr; 797 798 if (IN6_IS_ADDR_V4MAPPED(&sin6_p->sin6_addr)) { 799 /* can't bind v4-mapped addrs either! */ 800 /* NOTE: we don't support SIIT */ 801 SCTP_LTRACE_ERR_RET(inp, NULL, NULL, SCTP_FROM_SCTP6_USRREQ, EINVAL); 802 return (EINVAL); 803 } 804 } 805 error = sctp_inpcb_bind(so, addr, NULL, p); 806 return (error); 807} 808 809 810static void 811sctp6_close(struct socket *so) 812{ 813 sctp_close(so); 814} 815 816/* This could be made common with sctp_detach() since they are identical */ 817 818static 819int 820sctp6_disconnect(struct socket *so) 821{ 822 return (sctp_disconnect(so)); 823} 824 825 826int 827sctp_sendm(struct socket *so, int flags, struct mbuf *m, struct sockaddr *addr, 828 struct mbuf *control, struct thread *p); 829 830 831static int 832sctp6_send(struct socket *so, int flags, struct mbuf *m, struct sockaddr *addr, 833 struct mbuf *control, struct thread *p) 834{ 835 struct sctp_inpcb *inp; 836 struct in6pcb *inp6; 837 838#ifdef INET 839 struct sockaddr_in6 *sin6; 840 841#endif /* INET */ 842 /* No SPL needed since sctp_output does this */ 843 844 inp = (struct sctp_inpcb *)so->so_pcb; 845 if (inp == NULL) { 846 if (control) { 847 SCTP_RELEASE_PKT(control); 848 control = NULL; 849 } 850 SCTP_RELEASE_PKT(m); 851 SCTP_LTRACE_ERR_RET(inp, NULL, NULL, SCTP_FROM_SCTP6_USRREQ, EINVAL); 852 return (EINVAL); 853 } 854 inp6 = (struct in6pcb *)inp; 855 /* 856 * For the TCP model we may get a NULL addr, if we are a connected 857 * socket thats ok. 858 */ 859 if ((inp->sctp_flags & SCTP_PCB_FLAGS_CONNECTED) && 860 (addr == NULL)) { 861 goto connected_type; 862 } 863 if (addr == NULL) { 864 SCTP_RELEASE_PKT(m); 865 if (control) { 866 SCTP_RELEASE_PKT(control); 867 control = NULL; 868 } 869 SCTP_LTRACE_ERR_RET(inp, NULL, NULL, SCTP_FROM_SCTP6_USRREQ, EDESTADDRREQ); 870 return (EDESTADDRREQ); 871 } 872#ifdef INET 873 sin6 = (struct sockaddr_in6 *)addr; 874 if (SCTP_IPV6_V6ONLY(inp6)) { 875 /* 876 * if IPV6_V6ONLY flag, we discard datagrams destined to a 877 * v4 addr or v4-mapped addr 878 */ 879 if (addr->sa_family == AF_INET) { 880 SCTP_LTRACE_ERR_RET(inp, NULL, NULL, SCTP_FROM_SCTP6_USRREQ, EINVAL); 881 return (EINVAL); 882 } 883 if (IN6_IS_ADDR_V4MAPPED(&sin6->sin6_addr)) { 884 SCTP_LTRACE_ERR_RET(inp, NULL, NULL, SCTP_FROM_SCTP6_USRREQ, EINVAL); 885 return (EINVAL); 886 } 887 } 888 if (IN6_IS_ADDR_V4MAPPED(&sin6->sin6_addr)) { 889 if (!MODULE_GLOBAL(ip6_v6only)) { 890 struct sockaddr_in sin; 891 892 /* convert v4-mapped into v4 addr and send */ 893 in6_sin6_2_sin(&sin, sin6); 894 return (sctp_sendm(so, flags, m, (struct sockaddr *)&sin, 895 control, p)); 896 } else { 897 /* mapped addresses aren't enabled */ 898 SCTP_LTRACE_ERR_RET(inp, NULL, NULL, SCTP_FROM_SCTP6_USRREQ, EINVAL); 899 return (EINVAL); 900 } 901 } 902#endif /* INET */ 903connected_type: 904 /* now what about control */ 905 if (control) { 906 if (inp->control) { 907 SCTP_PRINTF("huh? control set?\n"); 908 SCTP_RELEASE_PKT(inp->control); 909 inp->control = NULL; 910 } 911 inp->control = control; 912 } 913 /* Place the data */ 914 if (inp->pkt) { 915 SCTP_BUF_NEXT(inp->pkt_last) = m; 916 inp->pkt_last = m; 917 } else { 918 inp->pkt_last = inp->pkt = m; 919 } 920 if ( 921 /* FreeBSD and MacOSX uses a flag passed */ 922 ((flags & PRUS_MORETOCOME) == 0) 923 ) { 924 /* 925 * note with the current version this code will only be used 926 * by OpenBSD, NetBSD and FreeBSD have methods for 927 * re-defining sosend() to use sctp_sosend(). One can 928 * optionaly switch back to this code (by changing back the 929 * defininitions but this is not advisable. 930 */ 931 int ret; 932 933 ret = sctp_output(inp, inp->pkt, addr, inp->control, p, flags); 934 inp->pkt = NULL; 935 inp->control = NULL; 936 return (ret); 937 } else { 938 return (0); 939 } 940} 941 942static int 943sctp6_connect(struct socket *so, struct sockaddr *addr, struct thread *p) 944{ 945 uint32_t vrf_id; 946 int error = 0; 947 struct sctp_inpcb *inp; 948 struct in6pcb *inp6; 949 struct sctp_tcb *stcb; 950 951#ifdef INET 952 struct sockaddr_in6 *sin6; 953 struct sockaddr_storage ss; 954 955#endif 956 957 inp6 = (struct in6pcb *)so->so_pcb; 958 inp = (struct sctp_inpcb *)so->so_pcb; 959 if (inp == NULL) { 960 SCTP_LTRACE_ERR_RET(inp, NULL, NULL, SCTP_FROM_SCTP6_USRREQ, ECONNRESET); 961 return (ECONNRESET); /* I made the same as TCP since we are 962 * not setup? */ 963 } 964 if (addr == NULL) { 965 SCTP_LTRACE_ERR_RET(inp, NULL, NULL, SCTP_FROM_SCTP6_USRREQ, EINVAL); 966 return (EINVAL); 967 } 968 switch (addr->sa_family) { 969#ifdef INET 970 case AF_INET: 971 if (addr->sa_len != sizeof(struct sockaddr_in)) { 972 SCTP_LTRACE_ERR_RET(inp, NULL, NULL, SCTP_FROM_SCTP6_USRREQ, EINVAL); 973 return (EINVAL); 974 } 975 break; 976#endif 977#ifdef INET6 978 case AF_INET6: 979 if (addr->sa_len != sizeof(struct sockaddr_in6)) { 980 SCTP_LTRACE_ERR_RET(inp, NULL, NULL, SCTP_FROM_SCTP6_USRREQ, EINVAL); 981 return (EINVAL); 982 } 983 break; 984#endif 985 default: 986 SCTP_LTRACE_ERR_RET(inp, NULL, NULL, SCTP_FROM_SCTP6_USRREQ, EINVAL); 987 return (EINVAL); 988 } 989 990 vrf_id = inp->def_vrf_id; 991 SCTP_ASOC_CREATE_LOCK(inp); 992 SCTP_INP_RLOCK(inp); 993 if ((inp->sctp_flags & SCTP_PCB_FLAGS_UNBOUND) == 994 SCTP_PCB_FLAGS_UNBOUND) { 995 /* Bind a ephemeral port */ 996 SCTP_INP_RUNLOCK(inp); 997 error = sctp6_bind(so, NULL, p); 998 if (error) { 999 SCTP_ASOC_CREATE_UNLOCK(inp); 1000 1001 return (error); 1002 } 1003 SCTP_INP_RLOCK(inp); 1004 } 1005 if ((inp->sctp_flags & SCTP_PCB_FLAGS_TCPTYPE) && 1006 (inp->sctp_flags & SCTP_PCB_FLAGS_CONNECTED)) { 1007 /* We are already connected AND the TCP model */ 1008 SCTP_INP_RUNLOCK(inp); 1009 SCTP_ASOC_CREATE_UNLOCK(inp); 1010 SCTP_LTRACE_ERR_RET(inp, NULL, NULL, SCTP_FROM_SCTP6_USRREQ, EADDRINUSE); 1011 return (EADDRINUSE); 1012 } 1013#ifdef INET 1014 sin6 = (struct sockaddr_in6 *)addr; 1015 if (SCTP_IPV6_V6ONLY(inp6)) { 1016 /* 1017 * if IPV6_V6ONLY flag, ignore connections destined to a v4 1018 * addr or v4-mapped addr 1019 */ 1020 if (addr->sa_family == AF_INET) { 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 if (IN6_IS_ADDR_V4MAPPED(&sin6->sin6_addr)) { 1027 SCTP_INP_RUNLOCK(inp); 1028 SCTP_ASOC_CREATE_UNLOCK(inp); 1029 SCTP_LTRACE_ERR_RET(inp, NULL, NULL, SCTP_FROM_SCTP6_USRREQ, EINVAL); 1030 return (EINVAL); 1031 } 1032 } 1033 if (IN6_IS_ADDR_V4MAPPED(&sin6->sin6_addr)) { 1034 if (!MODULE_GLOBAL(ip6_v6only)) { 1035 /* convert v4-mapped into v4 addr */ 1036 in6_sin6_2_sin((struct sockaddr_in *)&ss, sin6); 1037 addr = (struct sockaddr *)&ss; 1038 } else { 1039 /* mapped addresses aren't enabled */ 1040 SCTP_INP_RUNLOCK(inp); 1041 SCTP_ASOC_CREATE_UNLOCK(inp); 1042 SCTP_LTRACE_ERR_RET(inp, NULL, NULL, SCTP_FROM_SCTP6_USRREQ, EINVAL); 1043 return (EINVAL); 1044 } 1045 } 1046#endif /* INET */ 1047 /* Now do we connect? */ 1048 if (inp->sctp_flags & SCTP_PCB_FLAGS_CONNECTED) { 1049 stcb = LIST_FIRST(&inp->sctp_asoc_list); 1050 if (stcb) { 1051 SCTP_TCB_UNLOCK(stcb); 1052 } 1053 SCTP_INP_RUNLOCK(inp); 1054 } else { 1055 SCTP_INP_RUNLOCK(inp); 1056 SCTP_INP_WLOCK(inp); 1057 SCTP_INP_INCR_REF(inp); 1058 SCTP_INP_WUNLOCK(inp); 1059 stcb = sctp_findassociation_ep_addr(&inp, addr, NULL, NULL, NULL); 1060 if (stcb == NULL) { 1061 SCTP_INP_WLOCK(inp); 1062 SCTP_INP_DECR_REF(inp); 1063 SCTP_INP_WUNLOCK(inp); 1064 } 1065 } 1066 1067 if (stcb != NULL) { 1068 /* Already have or am bring up an association */ 1069 SCTP_ASOC_CREATE_UNLOCK(inp); 1070 SCTP_TCB_UNLOCK(stcb); 1071 SCTP_LTRACE_ERR_RET(inp, NULL, NULL, SCTP_FROM_SCTP6_USRREQ, EALREADY); 1072 return (EALREADY); 1073 } 1074 /* We are GOOD to go */ 1075 stcb = sctp_aloc_assoc(inp, addr, &error, 0, vrf_id, p); 1076 SCTP_ASOC_CREATE_UNLOCK(inp); 1077 if (stcb == NULL) { 1078 /* Gak! no memory */ 1079 return (error); 1080 } 1081 if (stcb->sctp_ep->sctp_flags & SCTP_PCB_FLAGS_TCPTYPE) { 1082 stcb->sctp_ep->sctp_flags |= SCTP_PCB_FLAGS_CONNECTED; 1083 /* Set the connected flag so we can queue data */ 1084 soisconnecting(so); 1085 } 1086 stcb->asoc.state = SCTP_STATE_COOKIE_WAIT; 1087 (void)SCTP_GETTIME_TIMEVAL(&stcb->asoc.time_entered); 1088 1089 /* initialize authentication parameters for the assoc */ 1090 sctp_initialize_auth_params(inp, stcb); 1091 1092 sctp_send_initiate(inp, stcb, SCTP_SO_LOCKED); 1093 SCTP_TCB_UNLOCK(stcb); 1094 return (error); 1095} 1096 1097static int 1098sctp6_getaddr(struct socket *so, struct sockaddr **addr) 1099{ 1100 struct sockaddr_in6 *sin6; 1101 struct sctp_inpcb *inp; 1102 uint32_t vrf_id; 1103 struct sctp_ifa *sctp_ifa; 1104 1105 int error; 1106 1107 /* 1108 * Do the malloc first in case it blocks. 1109 */ 1110 SCTP_MALLOC_SONAME(sin6, struct sockaddr_in6 *, sizeof(*sin6)); 1111 if (sin6 == NULL) 1112 return (ENOMEM); 1113 sin6->sin6_family = AF_INET6; 1114 sin6->sin6_len = sizeof(*sin6); 1115 1116 inp = (struct sctp_inpcb *)so->so_pcb; 1117 if (inp == NULL) { 1118 SCTP_FREE_SONAME(sin6); 1119 SCTP_LTRACE_ERR_RET(inp, NULL, NULL, SCTP_FROM_SCTP6_USRREQ, ECONNRESET); 1120 return (ECONNRESET); 1121 } 1122 SCTP_INP_RLOCK(inp); 1123 sin6->sin6_port = inp->sctp_lport; 1124 if (inp->sctp_flags & SCTP_PCB_FLAGS_BOUNDALL) { 1125 /* For the bound all case you get back 0 */ 1126 if (inp->sctp_flags & SCTP_PCB_FLAGS_CONNECTED) { 1127 struct sctp_tcb *stcb; 1128 struct sockaddr_in6 *sin_a6; 1129 struct sctp_nets *net; 1130 int fnd; 1131 1132 stcb = LIST_FIRST(&inp->sctp_asoc_list); 1133 if (stcb == NULL) { 1134 goto notConn6; 1135 } 1136 fnd = 0; 1137 sin_a6 = NULL; 1138 TAILQ_FOREACH(net, &stcb->asoc.nets, sctp_next) { 1139 sin_a6 = (struct sockaddr_in6 *)&net->ro._l_addr; 1140 if (sin_a6 == NULL) 1141 /* this will make coverity happy */ 1142 continue; 1143 1144 if (sin_a6->sin6_family == AF_INET6) { 1145 fnd = 1; 1146 break; 1147 } 1148 } 1149 if ((!fnd) || (sin_a6 == NULL)) { 1150 /* punt */ 1151 goto notConn6; 1152 } 1153 vrf_id = inp->def_vrf_id; 1154 sctp_ifa = sctp_source_address_selection(inp, stcb, (sctp_route_t *) & net->ro, net, 0, vrf_id); 1155 if (sctp_ifa) { 1156 sin6->sin6_addr = sctp_ifa->address.sin6.sin6_addr; 1157 } 1158 } else { 1159 /* For the bound all case you get back 0 */ 1160 notConn6: 1161 memset(&sin6->sin6_addr, 0, sizeof(sin6->sin6_addr)); 1162 } 1163 } else { 1164 /* Take the first IPv6 address in the list */ 1165 struct sctp_laddr *laddr; 1166 int fnd = 0; 1167 1168 LIST_FOREACH(laddr, &inp->sctp_addr_list, sctp_nxt_addr) { 1169 if (laddr->ifa->address.sa.sa_family == AF_INET6) { 1170 struct sockaddr_in6 *sin_a; 1171 1172 sin_a = (struct sockaddr_in6 *)&laddr->ifa->address.sin6; 1173 sin6->sin6_addr = sin_a->sin6_addr; 1174 fnd = 1; 1175 break; 1176 } 1177 } 1178 if (!fnd) { 1179 SCTP_FREE_SONAME(sin6); 1180 SCTP_INP_RUNLOCK(inp); 1181 SCTP_LTRACE_ERR_RET(inp, NULL, NULL, SCTP_FROM_SCTP6_USRREQ, ENOENT); 1182 return (ENOENT); 1183 } 1184 } 1185 SCTP_INP_RUNLOCK(inp); 1186 /* Scoping things for v6 */ 1187 if ((error = sa6_recoverscope(sin6)) != 0) { 1188 SCTP_FREE_SONAME(sin6); 1189 return (error); 1190 } 1191 (*addr) = (struct sockaddr *)sin6; 1192 return (0); 1193} 1194 1195static int 1196sctp6_peeraddr(struct socket *so, struct sockaddr **addr) 1197{ 1198 struct sockaddr_in6 *sin6; 1199 int fnd; 1200 struct sockaddr_in6 *sin_a6; 1201 struct sctp_inpcb *inp; 1202 struct sctp_tcb *stcb; 1203 struct sctp_nets *net; 1204 int error; 1205 1206 /* Do the malloc first in case it blocks. */ 1207 SCTP_MALLOC_SONAME(sin6, struct sockaddr_in6 *, sizeof *sin6); 1208 if (sin6 == NULL) 1209 return (ENOMEM); 1210 sin6->sin6_family = AF_INET6; 1211 sin6->sin6_len = sizeof(*sin6); 1212 1213 inp = (struct sctp_inpcb *)so->so_pcb; 1214 if ((inp == NULL) || 1215 ((inp->sctp_flags & SCTP_PCB_FLAGS_CONNECTED) == 0)) { 1216 /* UDP type and listeners will drop out here */ 1217 SCTP_FREE_SONAME(sin6); 1218 SCTP_LTRACE_ERR_RET(inp, NULL, NULL, SCTP_FROM_SCTP6_USRREQ, ENOTCONN); 1219 return (ENOTCONN); 1220 } 1221 SCTP_INP_RLOCK(inp); 1222 stcb = LIST_FIRST(&inp->sctp_asoc_list); 1223 if (stcb) { 1224 SCTP_TCB_LOCK(stcb); 1225 } 1226 SCTP_INP_RUNLOCK(inp); 1227 if (stcb == NULL) { 1228 SCTP_FREE_SONAME(sin6); 1229 SCTP_LTRACE_ERR_RET(inp, NULL, NULL, SCTP_FROM_SCTP6_USRREQ, ECONNRESET); 1230 return (ECONNRESET); 1231 } 1232 fnd = 0; 1233 TAILQ_FOREACH(net, &stcb->asoc.nets, sctp_next) { 1234 sin_a6 = (struct sockaddr_in6 *)&net->ro._l_addr; 1235 if (sin_a6->sin6_family == AF_INET6) { 1236 fnd = 1; 1237 sin6->sin6_port = stcb->rport; 1238 sin6->sin6_addr = sin_a6->sin6_addr; 1239 break; 1240 } 1241 } 1242 SCTP_TCB_UNLOCK(stcb); 1243 if (!fnd) { 1244 /* No IPv4 address */ 1245 SCTP_FREE_SONAME(sin6); 1246 SCTP_LTRACE_ERR_RET(inp, NULL, NULL, SCTP_FROM_SCTP6_USRREQ, ENOENT); 1247 return (ENOENT); 1248 } 1249 if ((error = sa6_recoverscope(sin6)) != 0) 1250 return (error); 1251 *addr = (struct sockaddr *)sin6; 1252 return (0); 1253} 1254 1255static int 1256sctp6_in6getaddr(struct socket *so, struct sockaddr **nam) 1257{ 1258#ifdef INET 1259 struct sockaddr *addr; 1260 1261#endif 1262 struct in6pcb *inp6 = sotoin6pcb(so); 1263 int error; 1264 1265 if (inp6 == NULL) { 1266 SCTP_LTRACE_ERR_RET(NULL, NULL, NULL, SCTP_FROM_SCTP6_USRREQ, EINVAL); 1267 return (EINVAL); 1268 } 1269 /* allow v6 addresses precedence */ 1270 error = sctp6_getaddr(so, nam); 1271#ifdef INET 1272 if (error) { 1273 /* try v4 next if v6 failed */ 1274 error = sctp_ingetaddr(so, nam); 1275 if (error) { 1276 return (error); 1277 } 1278 addr = *nam; 1279 /* if I'm V6ONLY, convert it to v4-mapped */ 1280 if (SCTP_IPV6_V6ONLY(inp6)) { 1281 struct sockaddr_in6 sin6; 1282 1283 in6_sin_2_v4mapsin6((struct sockaddr_in *)addr, &sin6); 1284 memcpy(addr, &sin6, sizeof(struct sockaddr_in6)); 1285 } 1286 } 1287#endif 1288 return (error); 1289} 1290 1291 1292static int 1293sctp6_getpeeraddr(struct socket *so, struct sockaddr **nam) 1294{ 1295#ifdef INET 1296 struct sockaddr *addr; 1297 1298#endif 1299 struct in6pcb *inp6 = sotoin6pcb(so); 1300 int error; 1301 1302 if (inp6 == NULL) { 1303 SCTP_LTRACE_ERR_RET(NULL, NULL, NULL, SCTP_FROM_SCTP6_USRREQ, EINVAL); 1304 return (EINVAL); 1305 } 1306 /* allow v6 addresses precedence */ 1307 error = sctp6_peeraddr(so, nam); 1308#ifdef INET 1309 if (error) { 1310 /* try v4 next if v6 failed */ 1311 error = sctp_peeraddr(so, nam); 1312 if (error) { 1313 return (error); 1314 } 1315 addr = *nam; 1316 /* if I'm V6ONLY, convert it to v4-mapped */ 1317 if (SCTP_IPV6_V6ONLY(inp6)) { 1318 struct sockaddr_in6 sin6; 1319 1320 in6_sin_2_v4mapsin6((struct sockaddr_in *)addr, &sin6); 1321 memcpy(addr, &sin6, sizeof(struct sockaddr_in6)); 1322 } 1323 } 1324#endif 1325 return (error); 1326} 1327 1328struct pr_usrreqs sctp6_usrreqs = { 1329 .pru_abort = sctp6_abort, 1330 .pru_accept = sctp_accept, 1331 .pru_attach = sctp6_attach, 1332 .pru_bind = sctp6_bind, 1333 .pru_connect = sctp6_connect, 1334 .pru_control = in6_control, 1335 .pru_close = sctp6_close, 1336 .pru_detach = sctp6_close, 1337 .pru_sopoll = sopoll_generic, 1338 .pru_flush = sctp_flush, 1339 .pru_disconnect = sctp6_disconnect, 1340 .pru_listen = sctp_listen, 1341 .pru_peeraddr = sctp6_getpeeraddr, 1342 .pru_send = sctp6_send, 1343 .pru_shutdown = sctp_shutdown, 1344 .pru_sockaddr = sctp6_in6getaddr, 1345 .pru_sosend = sctp_sosend, 1346 .pru_soreceive = sctp_soreceive 1347}; 1348