sctp6_usrreq.c revision 231038
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 231038 2012-02-05 19:49:34Z 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 sctp_send_abort(m, iphlen, sh, 0, NULL, vrf_id, port); 241 goto bad; 242 } else if (stcb == NULL) { 243 refcount_up = 1; 244 } 245#ifdef IPSEC 246 /* 247 * Check AH/ESP integrity. 248 */ 249 in6p_ip = (struct inpcb *)in6p; 250 if (in6p_ip && (ipsec6_in_reject(m, in6p_ip))) { 251/* XXX */ 252 MODULE_GLOBAL(ipsec6stat).in_polvio++; 253 goto bad; 254 } 255#endif /* IPSEC */ 256 257 /* 258 * CONTROL chunk processing 259 */ 260 offset -= sizeof(*ch); 261 ecn_bits = ((ntohl(ip6->ip6_flow) >> 20) & 0x000000ff); 262 263 /* Length now holds the total packet length payload + iphlen */ 264 length = ntohs(ip6->ip6_plen) + iphlen; 265 266 /* sa_ignore NO_NULL_CHK */ 267 sctp_common_input_processing(&m, iphlen, offset, length, sh, ch, 268 in6p, stcb, net, ecn_bits, vrf_id, port); 269 /* inp's ref-count reduced && stcb unlocked */ 270 /* XXX this stuff below gets moved to appropriate parts later... */ 271 if (m) 272 sctp_m_freem(m); 273 if ((in6p) && refcount_up) { 274 /* reduce ref-count */ 275 SCTP_INP_WLOCK(in6p); 276 SCTP_INP_DECR_REF(in6p); 277 SCTP_INP_WUNLOCK(in6p); 278 } 279 return IPPROTO_DONE; 280 281bad: 282 if (stcb) { 283 SCTP_TCB_UNLOCK(stcb); 284 } 285 if ((in6p) && refcount_up) { 286 /* reduce ref-count */ 287 SCTP_INP_WLOCK(in6p); 288 SCTP_INP_DECR_REF(in6p); 289 SCTP_INP_WUNLOCK(in6p); 290 } 291 if (m) 292 sctp_m_freem(m); 293 return IPPROTO_DONE; 294} 295 296 297static void 298sctp6_notify_mbuf(struct sctp_inpcb *inp, struct icmp6_hdr *icmp6, 299 struct sctphdr *sh, struct sctp_tcb *stcb, struct sctp_nets *net) 300{ 301 uint32_t nxtsz; 302 303 if ((inp == NULL) || (stcb == NULL) || (net == NULL) || 304 (icmp6 == NULL) || (sh == NULL)) { 305 goto out; 306 } 307 /* First do we even look at it? */ 308 if (ntohl(sh->v_tag) != (stcb->asoc.peer_vtag)) 309 goto out; 310 311 if (icmp6->icmp6_type != ICMP6_PACKET_TOO_BIG) { 312 /* not PACKET TO BIG */ 313 goto out; 314 } 315 /* 316 * ok we need to look closely. We could even get smarter and look at 317 * anyone that we sent to in case we get a different ICMP that tells 318 * us there is no way to reach a host, but for this impl, all we 319 * care about is MTU discovery. 320 */ 321 nxtsz = ntohl(icmp6->icmp6_mtu); 322 /* Stop any PMTU timer */ 323 sctp_timer_stop(SCTP_TIMER_TYPE_PATHMTURAISE, inp, stcb, NULL, SCTP_FROM_SCTP6_USRREQ + SCTP_LOC_1); 324 325 /* Adjust destination size limit */ 326 if (net->mtu > nxtsz) { 327 net->mtu = nxtsz; 328 if (net->port) { 329 net->mtu -= sizeof(struct udphdr); 330 } 331 } 332 /* now what about the ep? */ 333 if (stcb->asoc.smallest_mtu > nxtsz) { 334 struct sctp_tmit_chunk *chk; 335 336 /* Adjust that too */ 337 stcb->asoc.smallest_mtu = nxtsz; 338 /* now off to subtract IP_DF flag if needed */ 339 340 TAILQ_FOREACH(chk, &stcb->asoc.send_queue, sctp_next) { 341 if ((uint32_t) (chk->send_size + IP_HDR_SIZE) > nxtsz) { 342 chk->flags |= CHUNK_FLAGS_FRAGMENT_OK; 343 } 344 } 345 TAILQ_FOREACH(chk, &stcb->asoc.sent_queue, sctp_next) { 346 if ((uint32_t) (chk->send_size + IP_HDR_SIZE) > nxtsz) { 347 /* 348 * For this guy we also mark for immediate 349 * resend since we sent to big of chunk 350 */ 351 chk->flags |= CHUNK_FLAGS_FRAGMENT_OK; 352 if (chk->sent != SCTP_DATAGRAM_RESEND) 353 stcb->asoc.sent_queue_retran_cnt++; 354 chk->sent = SCTP_DATAGRAM_RESEND; 355 chk->rec.data.doing_fast_retransmit = 0; 356 357 chk->sent = SCTP_DATAGRAM_RESEND; 358 /* Clear any time so NO RTT is being done */ 359 chk->sent_rcv_time.tv_sec = 0; 360 chk->sent_rcv_time.tv_usec = 0; 361 stcb->asoc.total_flight -= chk->send_size; 362 net->flight_size -= chk->send_size; 363 } 364 } 365 } 366 sctp_timer_start(SCTP_TIMER_TYPE_PATHMTURAISE, inp, stcb, NULL); 367out: 368 if (stcb) { 369 SCTP_TCB_UNLOCK(stcb); 370 } 371} 372 373 374void 375sctp6_notify(struct sctp_inpcb *inp, 376 struct icmp6_hdr *icmph, 377 struct sctphdr *sh, 378 struct sockaddr *to, 379 struct sctp_tcb *stcb, 380 struct sctp_nets *net) 381{ 382#if defined (__APPLE__) || defined(SCTP_SO_LOCK_TESTING) 383 struct socket *so; 384 385#endif 386 /* protection */ 387 int reason; 388 389 390 if ((inp == NULL) || (stcb == NULL) || (net == NULL) || 391 (sh == NULL) || (to == NULL)) { 392 if (stcb) 393 SCTP_TCB_UNLOCK(stcb); 394 return; 395 } 396 /* First job is to verify the vtag matches what I would send */ 397 if (ntohl(sh->v_tag) != (stcb->asoc.peer_vtag)) { 398 SCTP_TCB_UNLOCK(stcb); 399 return; 400 } 401 if (icmph->icmp6_type != ICMP_UNREACH) { 402 /* We only care about unreachable */ 403 SCTP_TCB_UNLOCK(stcb); 404 return; 405 } 406 if ((icmph->icmp6_code == ICMP_UNREACH_NET) || 407 (icmph->icmp6_code == ICMP_UNREACH_HOST) || 408 (icmph->icmp6_code == ICMP_UNREACH_NET_UNKNOWN) || 409 (icmph->icmp6_code == ICMP_UNREACH_HOST_UNKNOWN) || 410 (icmph->icmp6_code == ICMP_UNREACH_ISOLATED) || 411 (icmph->icmp6_code == ICMP_UNREACH_NET_PROHIB) || 412 (icmph->icmp6_code == ICMP_UNREACH_HOST_PROHIB) || 413 (icmph->icmp6_code == ICMP_UNREACH_FILTER_PROHIB)) { 414 415 /* 416 * Hmm reachablity problems we must examine closely. If its 417 * not reachable, we may have lost a network. Or if there is 418 * NO protocol at the other end named SCTP. well we consider 419 * it a OOTB abort. 420 */ 421 if (net->dest_state & SCTP_ADDR_REACHABLE) { 422 /* Ok that destination is NOT reachable */ 423 net->dest_state &= ~SCTP_ADDR_REACHABLE; 424 net->dest_state &= ~SCTP_ADDR_PF; 425 sctp_ulp_notify(SCTP_NOTIFY_INTERFACE_DOWN, 426 stcb, SCTP_FAILED_THRESHOLD, 427 (void *)net, SCTP_SO_NOT_LOCKED); 428 } 429 SCTP_TCB_UNLOCK(stcb); 430 } else if ((icmph->icmp6_code == ICMP_UNREACH_PROTOCOL) || 431 (icmph->icmp6_code == ICMP_UNREACH_PORT)) { 432 /* 433 * Here the peer is either playing tricks on us, including 434 * an address that belongs to someone who does not support 435 * SCTP OR was a userland implementation that shutdown and 436 * now is dead. In either case treat it like a OOTB abort 437 * with no TCB 438 */ 439 reason = SCTP_PEER_FAULTY; 440 sctp_abort_notification(stcb, reason, SCTP_SO_NOT_LOCKED); 441#if defined (__APPLE__) || defined(SCTP_SO_LOCK_TESTING) 442 so = SCTP_INP_SO(inp); 443 atomic_add_int(&stcb->asoc.refcnt, 1); 444 SCTP_TCB_UNLOCK(stcb); 445 SCTP_SOCKET_LOCK(so, 1); 446 SCTP_TCB_LOCK(stcb); 447 atomic_subtract_int(&stcb->asoc.refcnt, 1); 448#endif 449 (void)sctp_free_assoc(inp, stcb, SCTP_NORMAL_PROC, SCTP_FROM_SCTP_USRREQ + SCTP_LOC_2); 450#if defined (__APPLE__) || defined(SCTP_SO_LOCK_TESTING) 451 SCTP_SOCKET_UNLOCK(so, 1); 452 /* SCTP_TCB_UNLOCK(stcb); MT: I think this is not needed. */ 453#endif 454 /* no need to unlock here, since the TCB is gone */ 455 } else { 456 SCTP_TCB_UNLOCK(stcb); 457 } 458} 459 460 461 462void 463sctp6_ctlinput(int cmd, struct sockaddr *pktdst, void *d) 464{ 465 struct sctphdr sh; 466 struct ip6ctlparam *ip6cp = NULL; 467 uint32_t vrf_id; 468 469 vrf_id = SCTP_DEFAULT_VRFID; 470 471 if (pktdst->sa_family != AF_INET6 || 472 pktdst->sa_len != sizeof(struct sockaddr_in6)) 473 return; 474 475 if ((unsigned)cmd >= PRC_NCMDS) 476 return; 477 if (PRC_IS_REDIRECT(cmd)) { 478 d = NULL; 479 } else if (inet6ctlerrmap[cmd] == 0) { 480 return; 481 } 482 /* if the parameter is from icmp6, decode it. */ 483 if (d != NULL) { 484 ip6cp = (struct ip6ctlparam *)d; 485 } else { 486 ip6cp = (struct ip6ctlparam *)NULL; 487 } 488 489 if (ip6cp) { 490 /* 491 * XXX: We assume that when IPV6 is non NULL, M and OFF are 492 * valid. 493 */ 494 /* check if we can safely examine src and dst ports */ 495 struct sctp_inpcb *inp = NULL; 496 struct sctp_tcb *stcb = NULL; 497 struct sctp_nets *net = NULL; 498 struct sockaddr_in6 final; 499 500 if (ip6cp->ip6c_m == NULL) 501 return; 502 503 bzero(&sh, sizeof(sh)); 504 bzero(&final, sizeof(final)); 505 inp = NULL; 506 net = NULL; 507 m_copydata(ip6cp->ip6c_m, ip6cp->ip6c_off, sizeof(sh), 508 (caddr_t)&sh); 509 ip6cp->ip6c_src->sin6_port = sh.src_port; 510 final.sin6_len = sizeof(final); 511 final.sin6_family = AF_INET6; 512 final.sin6_addr = ((struct sockaddr_in6 *)pktdst)->sin6_addr; 513 final.sin6_port = sh.dest_port; 514 stcb = sctp_findassociation_addr_sa((struct sockaddr *)ip6cp->ip6c_src, 515 (struct sockaddr *)&final, 516 &inp, &net, 1, vrf_id); 517 /* inp's ref-count increased && stcb locked */ 518 if (stcb != NULL && inp && (inp->sctp_socket != NULL)) { 519 if (cmd == PRC_MSGSIZE) { 520 sctp6_notify_mbuf(inp, 521 ip6cp->ip6c_icmp6, 522 &sh, 523 stcb, 524 net); 525 /* inp's ref-count reduced && stcb unlocked */ 526 } else { 527 sctp6_notify(inp, ip6cp->ip6c_icmp6, &sh, 528 (struct sockaddr *)&final, 529 stcb, net); 530 /* inp's ref-count reduced && stcb unlocked */ 531 } 532 } else { 533 if (PRC_IS_REDIRECT(cmd) && inp) { 534 in6_rtchange((struct in6pcb *)inp, 535 inet6ctlerrmap[cmd]); 536 } 537 if (inp) { 538 /* reduce inp's ref-count */ 539 SCTP_INP_WLOCK(inp); 540 SCTP_INP_DECR_REF(inp); 541 SCTP_INP_WUNLOCK(inp); 542 } 543 if (stcb) 544 SCTP_TCB_UNLOCK(stcb); 545 } 546 } 547} 548 549/* 550 * this routine can probably be collasped into the one in sctp_userreq.c 551 * since they do the same thing and now we lookup with a sockaddr 552 */ 553static int 554sctp6_getcred(SYSCTL_HANDLER_ARGS) 555{ 556 struct xucred xuc; 557 struct sockaddr_in6 addrs[2]; 558 struct sctp_inpcb *inp; 559 struct sctp_nets *net; 560 struct sctp_tcb *stcb; 561 int error; 562 uint32_t vrf_id; 563 564 vrf_id = SCTP_DEFAULT_VRFID; 565 566 error = priv_check(req->td, PRIV_NETINET_GETCRED); 567 if (error) 568 return (error); 569 570 if (req->newlen != sizeof(addrs)) { 571 SCTP_LTRACE_ERR_RET(NULL, NULL, NULL, SCTP_FROM_SCTP6_USRREQ, EINVAL); 572 return (EINVAL); 573 } 574 if (req->oldlen != sizeof(struct ucred)) { 575 SCTP_LTRACE_ERR_RET(NULL, NULL, NULL, SCTP_FROM_SCTP6_USRREQ, EINVAL); 576 return (EINVAL); 577 } 578 error = SYSCTL_IN(req, addrs, sizeof(addrs)); 579 if (error) 580 return (error); 581 582 stcb = sctp_findassociation_addr_sa(sin6tosa(&addrs[0]), 583 sin6tosa(&addrs[1]), 584 &inp, &net, 1, vrf_id); 585 if (stcb == NULL || inp == NULL || inp->sctp_socket == NULL) { 586 if ((inp != NULL) && (stcb == NULL)) { 587 /* reduce ref-count */ 588 SCTP_INP_WLOCK(inp); 589 SCTP_INP_DECR_REF(inp); 590 goto cred_can_cont; 591 } 592 SCTP_LTRACE_ERR_RET(inp, NULL, NULL, SCTP_FROM_SCTP6_USRREQ, ENOENT); 593 error = ENOENT; 594 goto out; 595 } 596 SCTP_TCB_UNLOCK(stcb); 597 /* 598 * We use the write lock here, only since in the error leg we need 599 * it. If we used RLOCK, then we would have to 600 * wlock/decr/unlock/rlock. Which in theory could create a hole. 601 * Better to use higher wlock. 602 */ 603 SCTP_INP_WLOCK(inp); 604cred_can_cont: 605 error = cr_canseesocket(req->td->td_ucred, inp->sctp_socket); 606 if (error) { 607 SCTP_INP_WUNLOCK(inp); 608 goto out; 609 } 610 cru2x(inp->sctp_socket->so_cred, &xuc); 611 SCTP_INP_WUNLOCK(inp); 612 error = SYSCTL_OUT(req, &xuc, sizeof(struct xucred)); 613out: 614 return (error); 615} 616 617SYSCTL_PROC(_net_inet6_sctp6, OID_AUTO, getcred, CTLTYPE_OPAQUE | CTLFLAG_RW, 618 0, 0, 619 sctp6_getcred, "S,ucred", "Get the ucred of a SCTP6 connection"); 620 621 622/* This is the same as the sctp_abort() could be made common */ 623static void 624sctp6_abort(struct socket *so) 625{ 626 struct sctp_inpcb *inp; 627 uint32_t flags; 628 629 inp = (struct sctp_inpcb *)so->so_pcb; 630 if (inp == 0) { 631 SCTP_LTRACE_ERR_RET(inp, NULL, NULL, SCTP_FROM_SCTP6_USRREQ, EINVAL); 632 return; 633 } 634sctp_must_try_again: 635 flags = inp->sctp_flags; 636#ifdef SCTP_LOG_CLOSING 637 sctp_log_closing(inp, NULL, 17); 638#endif 639 if (((flags & SCTP_PCB_FLAGS_SOCKET_GONE) == 0) && 640 (atomic_cmpset_int(&inp->sctp_flags, flags, (flags | SCTP_PCB_FLAGS_SOCKET_GONE | SCTP_PCB_FLAGS_CLOSE_IP)))) { 641#ifdef SCTP_LOG_CLOSING 642 sctp_log_closing(inp, NULL, 16); 643#endif 644 sctp_inpcb_free(inp, SCTP_FREE_SHOULD_USE_ABORT, 645 SCTP_CALLED_AFTER_CMPSET_OFCLOSE); 646 SOCK_LOCK(so); 647 SCTP_SB_CLEAR(so->so_snd); 648 /* 649 * same for the rcv ones, they are only here for the 650 * accounting/select. 651 */ 652 SCTP_SB_CLEAR(so->so_rcv); 653 /* Now null out the reference, we are completely detached. */ 654 so->so_pcb = NULL; 655 SOCK_UNLOCK(so); 656 } else { 657 flags = inp->sctp_flags; 658 if ((flags & SCTP_PCB_FLAGS_SOCKET_GONE) == 0) { 659 goto sctp_must_try_again; 660 } 661 } 662 return; 663} 664 665static int 666sctp6_attach(struct socket *so, int proto SCTP_UNUSED, struct thread *p SCTP_UNUSED) 667{ 668 struct in6pcb *inp6; 669 int error; 670 struct sctp_inpcb *inp; 671 uint32_t vrf_id = SCTP_DEFAULT_VRFID; 672 673 inp = (struct sctp_inpcb *)so->so_pcb; 674 if (inp != NULL) { 675 SCTP_LTRACE_ERR_RET(inp, NULL, NULL, SCTP_FROM_SCTP6_USRREQ, EINVAL); 676 return EINVAL; 677 } 678 if (so->so_snd.sb_hiwat == 0 || so->so_rcv.sb_hiwat == 0) { 679 error = SCTP_SORESERVE(so, SCTP_BASE_SYSCTL(sctp_sendspace), SCTP_BASE_SYSCTL(sctp_recvspace)); 680 if (error) 681 return error; 682 } 683 error = sctp_inpcb_alloc(so, vrf_id); 684 if (error) 685 return error; 686 inp = (struct sctp_inpcb *)so->so_pcb; 687 SCTP_INP_WLOCK(inp); 688 inp->sctp_flags |= SCTP_PCB_FLAGS_BOUND_V6; /* I'm v6! */ 689 inp6 = (struct in6pcb *)inp; 690 691 inp6->inp_vflag |= INP_IPV6; 692 inp6->in6p_hops = -1; /* use kernel default */ 693 inp6->in6p_cksum = -1; /* just to be sure */ 694#ifdef INET 695 /* 696 * XXX: ugly!! IPv4 TTL initialization is necessary for an IPv6 697 * socket as well, because the socket may be bound to an IPv6 698 * wildcard address, which may match an IPv4-mapped IPv6 address. 699 */ 700 inp6->inp_ip_ttl = MODULE_GLOBAL(ip_defttl); 701#endif 702 /* 703 * Hmm what about the IPSEC stuff that is missing here but in 704 * sctp_attach()? 705 */ 706 SCTP_INP_WUNLOCK(inp); 707 return 0; 708} 709 710static int 711sctp6_bind(struct socket *so, struct sockaddr *addr, struct thread *p) 712{ 713 struct sctp_inpcb *inp; 714 struct in6pcb *inp6; 715 int error; 716 717 inp = (struct sctp_inpcb *)so->so_pcb; 718 if (inp == 0) { 719 SCTP_LTRACE_ERR_RET(inp, NULL, NULL, SCTP_FROM_SCTP6_USRREQ, EINVAL); 720 return EINVAL; 721 } 722 if (addr) { 723 switch (addr->sa_family) { 724#ifdef INET 725 case AF_INET: 726 if (addr->sa_len != sizeof(struct sockaddr_in)) { 727 SCTP_LTRACE_ERR_RET(inp, NULL, NULL, SCTP_FROM_SCTP6_USRREQ, EINVAL); 728 return EINVAL; 729 } 730 break; 731#endif 732#ifdef INET6 733 case AF_INET6: 734 if (addr->sa_len != sizeof(struct sockaddr_in6)) { 735 SCTP_LTRACE_ERR_RET(inp, NULL, NULL, SCTP_FROM_SCTP6_USRREQ, EINVAL); 736 return EINVAL; 737 } 738 break; 739#endif 740 default: 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 switch (addr->sa_family) { 750#ifdef INET 751 case AF_INET: 752 /* binding v4 addr to v6 socket, so reset flags */ 753 inp6->inp_vflag |= INP_IPV4; 754 inp6->inp_vflag &= ~INP_IPV6; 755 break; 756#endif 757#ifdef INET6 758 case AF_INET6: 759 { 760 struct sockaddr_in6 *sin6_p; 761 762 sin6_p = (struct sockaddr_in6 *)addr; 763 764 if (IN6_IS_ADDR_UNSPECIFIED(&sin6_p->sin6_addr)) { 765 inp6->inp_vflag |= INP_IPV4; 766 } 767#ifdef INET 768 if (IN6_IS_ADDR_V4MAPPED(&sin6_p->sin6_addr)) { 769 struct sockaddr_in sin; 770 771 in6_sin6_2_sin(&sin, sin6_p); 772 inp6->inp_vflag |= INP_IPV4; 773 inp6->inp_vflag &= ~INP_IPV6; 774 error = sctp_inpcb_bind(so, (struct sockaddr *)&sin, NULL, p); 775 return error; 776 } 777#endif 778 break; 779 } 780#endif 781 default: 782 break; 783 } 784 } else if (addr != NULL) { 785 struct sockaddr_in6 *sin6_p; 786 787 /* IPV6_V6ONLY socket */ 788#ifdef INET 789 if (addr->sa_family == AF_INET) { 790 /* can't bind v4 addr to v6 only socket! */ 791 SCTP_LTRACE_ERR_RET(inp, NULL, NULL, SCTP_FROM_SCTP6_USRREQ, EINVAL); 792 return EINVAL; 793 } 794#endif 795 sin6_p = (struct sockaddr_in6 *)addr; 796 797 if (IN6_IS_ADDR_V4MAPPED(&sin6_p->sin6_addr)) { 798 /* can't bind v4-mapped addrs either! */ 799 /* NOTE: we don't support SIIT */ 800 SCTP_LTRACE_ERR_RET(inp, NULL, NULL, SCTP_FROM_SCTP6_USRREQ, EINVAL); 801 return EINVAL; 802 } 803 } 804 error = sctp_inpcb_bind(so, addr, NULL, p); 805 return error; 806} 807 808 809static void 810sctp6_close(struct socket *so) 811{ 812 sctp_close(so); 813} 814 815/* This could be made common with sctp_detach() since they are identical */ 816 817static 818int 819sctp6_disconnect(struct socket *so) 820{ 821 return (sctp_disconnect(so)); 822} 823 824 825int 826sctp_sendm(struct socket *so, int flags, struct mbuf *m, struct sockaddr *addr, 827 struct mbuf *control, struct thread *p); 828 829 830static int 831sctp6_send(struct socket *so, int flags, struct mbuf *m, struct sockaddr *addr, 832 struct mbuf *control, struct thread *p) 833{ 834 struct sctp_inpcb *inp; 835 struct in6pcb *inp6; 836 837#ifdef INET 838 struct sockaddr_in6 *sin6; 839 840#endif /* INET */ 841 /* No SPL needed since sctp_output does this */ 842 843 inp = (struct sctp_inpcb *)so->so_pcb; 844 if (inp == NULL) { 845 if (control) { 846 SCTP_RELEASE_PKT(control); 847 control = NULL; 848 } 849 SCTP_RELEASE_PKT(m); 850 SCTP_LTRACE_ERR_RET(inp, NULL, NULL, SCTP_FROM_SCTP6_USRREQ, EINVAL); 851 return EINVAL; 852 } 853 inp6 = (struct in6pcb *)inp; 854 /* 855 * For the TCP model we may get a NULL addr, if we are a connected 856 * socket thats ok. 857 */ 858 if ((inp->sctp_flags & SCTP_PCB_FLAGS_CONNECTED) && 859 (addr == NULL)) { 860 goto connected_type; 861 } 862 if (addr == NULL) { 863 SCTP_RELEASE_PKT(m); 864 if (control) { 865 SCTP_RELEASE_PKT(control); 866 control = NULL; 867 } 868 SCTP_LTRACE_ERR_RET(inp, NULL, NULL, SCTP_FROM_SCTP6_USRREQ, EDESTADDRREQ); 869 return (EDESTADDRREQ); 870 } 871#ifdef INET 872 sin6 = (struct sockaddr_in6 *)addr; 873 if (SCTP_IPV6_V6ONLY(inp6)) { 874 /* 875 * if IPV6_V6ONLY flag, we discard datagrams destined to a 876 * v4 addr or v4-mapped addr 877 */ 878 if (addr->sa_family == AF_INET) { 879 SCTP_LTRACE_ERR_RET(inp, NULL, NULL, SCTP_FROM_SCTP6_USRREQ, EINVAL); 880 return EINVAL; 881 } 882 if (IN6_IS_ADDR_V4MAPPED(&sin6->sin6_addr)) { 883 SCTP_LTRACE_ERR_RET(inp, NULL, NULL, SCTP_FROM_SCTP6_USRREQ, EINVAL); 884 return EINVAL; 885 } 886 } 887 if (IN6_IS_ADDR_V4MAPPED(&sin6->sin6_addr)) { 888 if (!MODULE_GLOBAL(ip6_v6only)) { 889 struct sockaddr_in sin; 890 891 /* convert v4-mapped into v4 addr and send */ 892 in6_sin6_2_sin(&sin, sin6); 893 return sctp_sendm(so, flags, m, (struct sockaddr *)&sin, 894 control, p); 895 } else { 896 /* mapped addresses aren't enabled */ 897 SCTP_LTRACE_ERR_RET(inp, NULL, NULL, SCTP_FROM_SCTP6_USRREQ, EINVAL); 898 return EINVAL; 899 } 900 } 901#endif /* INET */ 902connected_type: 903 /* now what about control */ 904 if (control) { 905 if (inp->control) { 906 SCTP_PRINTF("huh? control set?\n"); 907 SCTP_RELEASE_PKT(inp->control); 908 inp->control = NULL; 909 } 910 inp->control = control; 911 } 912 /* Place the data */ 913 if (inp->pkt) { 914 SCTP_BUF_NEXT(inp->pkt_last) = m; 915 inp->pkt_last = m; 916 } else { 917 inp->pkt_last = inp->pkt = m; 918 } 919 if ( 920 /* FreeBSD and MacOSX uses a flag passed */ 921 ((flags & PRUS_MORETOCOME) == 0) 922 ) { 923 /* 924 * note with the current version this code will only be used 925 * by OpenBSD, NetBSD and FreeBSD have methods for 926 * re-defining sosend() to use sctp_sosend(). One can 927 * optionaly switch back to this code (by changing back the 928 * defininitions but this is not advisable. 929 */ 930 int ret; 931 932 ret = sctp_output(inp, inp->pkt, addr, inp->control, p, flags); 933 inp->pkt = NULL; 934 inp->control = NULL; 935 return (ret); 936 } else { 937 return (0); 938 } 939} 940 941static int 942sctp6_connect(struct socket *so, struct sockaddr *addr, struct thread *p) 943{ 944 uint32_t vrf_id; 945 int error = 0; 946 struct sctp_inpcb *inp; 947 struct in6pcb *inp6; 948 struct sctp_tcb *stcb; 949 950#ifdef INET 951 struct sockaddr_in6 *sin6; 952 struct sockaddr_storage ss; 953 954#endif 955 956 inp6 = (struct in6pcb *)so->so_pcb; 957 inp = (struct sctp_inpcb *)so->so_pcb; 958 if (inp == 0) { 959 SCTP_LTRACE_ERR_RET(inp, NULL, NULL, SCTP_FROM_SCTP6_USRREQ, ECONNRESET); 960 return (ECONNRESET); /* I made the same as TCP since we are 961 * not setup? */ 962 } 963 if (addr == NULL) { 964 SCTP_LTRACE_ERR_RET(inp, NULL, NULL, SCTP_FROM_SCTP6_USRREQ, EINVAL); 965 return (EINVAL); 966 } 967 switch (addr->sa_family) { 968#ifdef INET 969 case AF_INET: 970 if (addr->sa_len != sizeof(struct sockaddr_in)) { 971 SCTP_LTRACE_ERR_RET(inp, NULL, NULL, SCTP_FROM_SCTP6_USRREQ, EINVAL); 972 return (EINVAL); 973 } 974 break; 975#endif 976#ifdef INET6 977 case AF_INET6: 978 if (addr->sa_len != sizeof(struct sockaddr_in6)) { 979 SCTP_LTRACE_ERR_RET(inp, NULL, NULL, SCTP_FROM_SCTP6_USRREQ, EINVAL); 980 return (EINVAL); 981 } 982 break; 983#endif 984 default: 985 SCTP_LTRACE_ERR_RET(inp, NULL, NULL, SCTP_FROM_SCTP6_USRREQ, EINVAL); 986 return (EINVAL); 987 } 988 989 vrf_id = inp->def_vrf_id; 990 SCTP_ASOC_CREATE_LOCK(inp); 991 SCTP_INP_RLOCK(inp); 992 if ((inp->sctp_flags & SCTP_PCB_FLAGS_UNBOUND) == 993 SCTP_PCB_FLAGS_UNBOUND) { 994 /* Bind a ephemeral port */ 995 SCTP_INP_RUNLOCK(inp); 996 error = sctp6_bind(so, NULL, p); 997 if (error) { 998 SCTP_ASOC_CREATE_UNLOCK(inp); 999 1000 return (error); 1001 } 1002 SCTP_INP_RLOCK(inp); 1003 } 1004 if ((inp->sctp_flags & SCTP_PCB_FLAGS_TCPTYPE) && 1005 (inp->sctp_flags & SCTP_PCB_FLAGS_CONNECTED)) { 1006 /* We are already connected AND the TCP model */ 1007 SCTP_INP_RUNLOCK(inp); 1008 SCTP_ASOC_CREATE_UNLOCK(inp); 1009 SCTP_LTRACE_ERR_RET(inp, NULL, NULL, SCTP_FROM_SCTP6_USRREQ, EADDRINUSE); 1010 return (EADDRINUSE); 1011 } 1012#ifdef INET 1013 sin6 = (struct sockaddr_in6 *)addr; 1014 if (SCTP_IPV6_V6ONLY(inp6)) { 1015 /* 1016 * if IPV6_V6ONLY flag, ignore connections destined to a v4 1017 * addr or v4-mapped addr 1018 */ 1019 if (addr->sa_family == AF_INET) { 1020 SCTP_INP_RUNLOCK(inp); 1021 SCTP_ASOC_CREATE_UNLOCK(inp); 1022 SCTP_LTRACE_ERR_RET(inp, NULL, NULL, SCTP_FROM_SCTP6_USRREQ, EINVAL); 1023 return EINVAL; 1024 } 1025 if (IN6_IS_ADDR_V4MAPPED(&sin6->sin6_addr)) { 1026 SCTP_INP_RUNLOCK(inp); 1027 SCTP_ASOC_CREATE_UNLOCK(inp); 1028 SCTP_LTRACE_ERR_RET(inp, NULL, NULL, SCTP_FROM_SCTP6_USRREQ, EINVAL); 1029 return EINVAL; 1030 } 1031 } 1032 if (IN6_IS_ADDR_V4MAPPED(&sin6->sin6_addr)) { 1033 if (!MODULE_GLOBAL(ip6_v6only)) { 1034 /* convert v4-mapped into v4 addr */ 1035 in6_sin6_2_sin((struct sockaddr_in *)&ss, sin6); 1036 addr = (struct sockaddr *)&ss; 1037 } else { 1038 /* mapped addresses aren't enabled */ 1039 SCTP_INP_RUNLOCK(inp); 1040 SCTP_ASOC_CREATE_UNLOCK(inp); 1041 SCTP_LTRACE_ERR_RET(inp, NULL, NULL, SCTP_FROM_SCTP6_USRREQ, EINVAL); 1042 return EINVAL; 1043 } 1044 } 1045#endif /* INET */ 1046 /* Now do we connect? */ 1047 if (inp->sctp_flags & SCTP_PCB_FLAGS_CONNECTED) { 1048 stcb = LIST_FIRST(&inp->sctp_asoc_list); 1049 if (stcb) { 1050 SCTP_TCB_UNLOCK(stcb); 1051 } 1052 SCTP_INP_RUNLOCK(inp); 1053 } else { 1054 SCTP_INP_RUNLOCK(inp); 1055 SCTP_INP_WLOCK(inp); 1056 SCTP_INP_INCR_REF(inp); 1057 SCTP_INP_WUNLOCK(inp); 1058 stcb = sctp_findassociation_ep_addr(&inp, addr, NULL, NULL, NULL); 1059 if (stcb == NULL) { 1060 SCTP_INP_WLOCK(inp); 1061 SCTP_INP_DECR_REF(inp); 1062 SCTP_INP_WUNLOCK(inp); 1063 } 1064 } 1065 1066 if (stcb != NULL) { 1067 /* Already have or am bring up an association */ 1068 SCTP_ASOC_CREATE_UNLOCK(inp); 1069 SCTP_TCB_UNLOCK(stcb); 1070 SCTP_LTRACE_ERR_RET(inp, NULL, NULL, SCTP_FROM_SCTP6_USRREQ, EALREADY); 1071 return (EALREADY); 1072 } 1073 /* We are GOOD to go */ 1074 stcb = sctp_aloc_assoc(inp, addr, &error, 0, vrf_id, p); 1075 SCTP_ASOC_CREATE_UNLOCK(inp); 1076 if (stcb == NULL) { 1077 /* Gak! no memory */ 1078 return (error); 1079 } 1080 if (stcb->sctp_ep->sctp_flags & SCTP_PCB_FLAGS_TCPTYPE) { 1081 stcb->sctp_ep->sctp_flags |= SCTP_PCB_FLAGS_CONNECTED; 1082 /* Set the connected flag so we can queue data */ 1083 soisconnecting(so); 1084 } 1085 stcb->asoc.state = SCTP_STATE_COOKIE_WAIT; 1086 (void)SCTP_GETTIME_TIMEVAL(&stcb->asoc.time_entered); 1087 1088 /* initialize authentication parameters for the assoc */ 1089 sctp_initialize_auth_params(inp, stcb); 1090 1091 sctp_send_initiate(inp, stcb, SCTP_SO_LOCKED); 1092 SCTP_TCB_UNLOCK(stcb); 1093 return error; 1094} 1095 1096static int 1097sctp6_getaddr(struct socket *so, struct sockaddr **addr) 1098{ 1099 struct sockaddr_in6 *sin6; 1100 struct sctp_inpcb *inp; 1101 uint32_t vrf_id; 1102 struct sctp_ifa *sctp_ifa; 1103 1104 int error; 1105 1106 /* 1107 * Do the malloc first in case it blocks. 1108 */ 1109 SCTP_MALLOC_SONAME(sin6, struct sockaddr_in6 *, sizeof(*sin6)); 1110 if (sin6 == NULL) 1111 return ENOMEM; 1112 sin6->sin6_family = AF_INET6; 1113 sin6->sin6_len = sizeof(*sin6); 1114 1115 inp = (struct sctp_inpcb *)so->so_pcb; 1116 if (inp == NULL) { 1117 SCTP_FREE_SONAME(sin6); 1118 SCTP_LTRACE_ERR_RET(inp, NULL, NULL, SCTP_FROM_SCTP6_USRREQ, ECONNRESET); 1119 return ECONNRESET; 1120 } 1121 SCTP_INP_RLOCK(inp); 1122 sin6->sin6_port = inp->sctp_lport; 1123 if (inp->sctp_flags & SCTP_PCB_FLAGS_BOUNDALL) { 1124 /* For the bound all case you get back 0 */ 1125 if (inp->sctp_flags & SCTP_PCB_FLAGS_CONNECTED) { 1126 struct sctp_tcb *stcb; 1127 struct sockaddr_in6 *sin_a6; 1128 struct sctp_nets *net; 1129 int fnd; 1130 1131 stcb = LIST_FIRST(&inp->sctp_asoc_list); 1132 if (stcb == NULL) { 1133 goto notConn6; 1134 } 1135 fnd = 0; 1136 sin_a6 = NULL; 1137 TAILQ_FOREACH(net, &stcb->asoc.nets, sctp_next) { 1138 sin_a6 = (struct sockaddr_in6 *)&net->ro._l_addr; 1139 if (sin_a6 == NULL) 1140 /* this will make coverity happy */ 1141 continue; 1142 1143 if (sin_a6->sin6_family == AF_INET6) { 1144 fnd = 1; 1145 break; 1146 } 1147 } 1148 if ((!fnd) || (sin_a6 == NULL)) { 1149 /* punt */ 1150 goto notConn6; 1151 } 1152 vrf_id = inp->def_vrf_id; 1153 sctp_ifa = sctp_source_address_selection(inp, stcb, (sctp_route_t *) & net->ro, net, 0, vrf_id); 1154 if (sctp_ifa) { 1155 sin6->sin6_addr = sctp_ifa->address.sin6.sin6_addr; 1156 } 1157 } else { 1158 /* For the bound all case you get back 0 */ 1159 notConn6: 1160 memset(&sin6->sin6_addr, 0, sizeof(sin6->sin6_addr)); 1161 } 1162 } else { 1163 /* Take the first IPv6 address in the list */ 1164 struct sctp_laddr *laddr; 1165 int fnd = 0; 1166 1167 LIST_FOREACH(laddr, &inp->sctp_addr_list, sctp_nxt_addr) { 1168 if (laddr->ifa->address.sa.sa_family == AF_INET6) { 1169 struct sockaddr_in6 *sin_a; 1170 1171 sin_a = (struct sockaddr_in6 *)&laddr->ifa->address.sin6; 1172 sin6->sin6_addr = sin_a->sin6_addr; 1173 fnd = 1; 1174 break; 1175 } 1176 } 1177 if (!fnd) { 1178 SCTP_FREE_SONAME(sin6); 1179 SCTP_INP_RUNLOCK(inp); 1180 SCTP_LTRACE_ERR_RET(inp, NULL, NULL, SCTP_FROM_SCTP6_USRREQ, ENOENT); 1181 return ENOENT; 1182 } 1183 } 1184 SCTP_INP_RUNLOCK(inp); 1185 /* Scoping things for v6 */ 1186 if ((error = sa6_recoverscope(sin6)) != 0) { 1187 SCTP_FREE_SONAME(sin6); 1188 return (error); 1189 } 1190 (*addr) = (struct sockaddr *)sin6; 1191 return (0); 1192} 1193 1194static int 1195sctp6_peeraddr(struct socket *so, struct sockaddr **addr) 1196{ 1197 struct sockaddr_in6 *sin6 = (struct sockaddr_in6 *)*addr; 1198 int fnd; 1199 struct sockaddr_in6 *sin_a6; 1200 struct sctp_inpcb *inp; 1201 struct sctp_tcb *stcb; 1202 struct sctp_nets *net; 1203 1204 int error; 1205 1206 /* 1207 * Do the malloc first in case it blocks. 1208 */ 1209 inp = (struct sctp_inpcb *)so->so_pcb; 1210 if ((inp->sctp_flags & SCTP_PCB_FLAGS_CONNECTED) == 0) { 1211 /* UDP type and listeners will drop out here */ 1212 SCTP_LTRACE_ERR_RET(inp, NULL, NULL, SCTP_FROM_SCTP6_USRREQ, ENOTCONN); 1213 return (ENOTCONN); 1214 } 1215 SCTP_MALLOC_SONAME(sin6, struct sockaddr_in6 *, sizeof *sin6); 1216 if (sin6 == NULL) 1217 return (ENOMEM); 1218 sin6->sin6_family = AF_INET6; 1219 sin6->sin6_len = sizeof(*sin6); 1220 1221 /* We must recapture incase we blocked */ 1222 inp = (struct sctp_inpcb *)so->so_pcb; 1223 if (inp == NULL) { 1224 SCTP_FREE_SONAME(sin6); 1225 SCTP_LTRACE_ERR_RET(inp, NULL, NULL, SCTP_FROM_SCTP6_USRREQ, ECONNRESET); 1226 return ECONNRESET; 1227 } 1228 SCTP_INP_RLOCK(inp); 1229 stcb = LIST_FIRST(&inp->sctp_asoc_list); 1230 if (stcb) { 1231 SCTP_TCB_LOCK(stcb); 1232 } 1233 SCTP_INP_RUNLOCK(inp); 1234 if (stcb == NULL) { 1235 SCTP_FREE_SONAME(sin6); 1236 SCTP_LTRACE_ERR_RET(inp, NULL, NULL, SCTP_FROM_SCTP6_USRREQ, ECONNRESET); 1237 return ECONNRESET; 1238 } 1239 fnd = 0; 1240 TAILQ_FOREACH(net, &stcb->asoc.nets, sctp_next) { 1241 sin_a6 = (struct sockaddr_in6 *)&net->ro._l_addr; 1242 if (sin_a6->sin6_family == AF_INET6) { 1243 fnd = 1; 1244 sin6->sin6_port = stcb->rport; 1245 sin6->sin6_addr = sin_a6->sin6_addr; 1246 break; 1247 } 1248 } 1249 SCTP_TCB_UNLOCK(stcb); 1250 if (!fnd) { 1251 /* No IPv4 address */ 1252 SCTP_FREE_SONAME(sin6); 1253 SCTP_LTRACE_ERR_RET(inp, NULL, NULL, SCTP_FROM_SCTP6_USRREQ, ENOENT); 1254 return ENOENT; 1255 } 1256 if ((error = sa6_recoverscope(sin6)) != 0) 1257 return (error); 1258 *addr = (struct sockaddr *)sin6; 1259 return (0); 1260} 1261 1262static int 1263sctp6_in6getaddr(struct socket *so, struct sockaddr **nam) 1264{ 1265#ifdef INET 1266 struct sockaddr *addr; 1267 1268#endif 1269 struct in6pcb *inp6 = sotoin6pcb(so); 1270 int error; 1271 1272 if (inp6 == NULL) { 1273 SCTP_LTRACE_ERR_RET(NULL, NULL, NULL, SCTP_FROM_SCTP6_USRREQ, EINVAL); 1274 return EINVAL; 1275 } 1276 /* allow v6 addresses precedence */ 1277 error = sctp6_getaddr(so, nam); 1278#ifdef INET 1279 if (error) { 1280 /* try v4 next if v6 failed */ 1281 error = sctp_ingetaddr(so, nam); 1282 if (error) { 1283 return (error); 1284 } 1285 addr = *nam; 1286 /* if I'm V6ONLY, convert it to v4-mapped */ 1287 if (SCTP_IPV6_V6ONLY(inp6)) { 1288 struct sockaddr_in6 sin6; 1289 1290 in6_sin_2_v4mapsin6((struct sockaddr_in *)addr, &sin6); 1291 memcpy(addr, &sin6, sizeof(struct sockaddr_in6)); 1292 } 1293 } 1294#endif 1295 return (error); 1296} 1297 1298 1299static int 1300sctp6_getpeeraddr(struct socket *so, struct sockaddr **nam) 1301{ 1302#ifdef INET 1303 struct sockaddr *addr; 1304 1305#endif 1306 struct in6pcb *inp6 = sotoin6pcb(so); 1307 int error; 1308 1309 if (inp6 == NULL) { 1310 SCTP_LTRACE_ERR_RET(NULL, NULL, NULL, SCTP_FROM_SCTP6_USRREQ, EINVAL); 1311 return EINVAL; 1312 } 1313 /* allow v6 addresses precedence */ 1314 error = sctp6_peeraddr(so, nam); 1315#ifdef INET 1316 if (error) { 1317 /* try v4 next if v6 failed */ 1318 error = sctp_peeraddr(so, nam); 1319 if (error) { 1320 return (error); 1321 } 1322 addr = *nam; 1323 /* if I'm V6ONLY, convert it to v4-mapped */ 1324 if (SCTP_IPV6_V6ONLY(inp6)) { 1325 struct sockaddr_in6 sin6; 1326 1327 in6_sin_2_v4mapsin6((struct sockaddr_in *)addr, &sin6); 1328 memcpy(addr, &sin6, sizeof(struct sockaddr_in6)); 1329 } 1330 } 1331#endif 1332 return error; 1333} 1334 1335struct pr_usrreqs sctp6_usrreqs = { 1336 .pru_abort = sctp6_abort, 1337 .pru_accept = sctp_accept, 1338 .pru_attach = sctp6_attach, 1339 .pru_bind = sctp6_bind, 1340 .pru_connect = sctp6_connect, 1341 .pru_control = in6_control, 1342 .pru_close = sctp6_close, 1343 .pru_detach = sctp6_close, 1344 .pru_sopoll = sopoll_generic, 1345 .pru_flush = sctp_flush, 1346 .pru_disconnect = sctp6_disconnect, 1347 .pru_listen = sctp_listen, 1348 .pru_peeraddr = sctp6_getpeeraddr, 1349 .pru_send = sctp6_send, 1350 .pru_shutdown = sctp_shutdown, 1351 .pru_sockaddr = sctp6_in6getaddr, 1352 .pru_sosend = sctp_sosend, 1353 .pru_soreceive = sctp_soreceive 1354}; 1355