1 /*- 2 * SPDX-License-Identifier: BSD-3-Clause 3 * 4 * Copyright (c) 2001-2007, by Cisco Systems, Inc. All rights reserved. 5 * Copyright (c) 2008-2012, by Randall Stewart. All rights reserved. 6 * Copyright (c) 2008-2012, by Michael Tuexen. All rights reserved. 7 * 8 * Redistribution and use in source and binary forms, with or without 9 * modification, are permitted provided that the following conditions are met: 10 * 11 * a) Redistributions of source code must retain the above copyright notice, 12 * this list of conditions and the following disclaimer. 13 * 14 * b) Redistributions in binary form must reproduce the above copyright 15 * notice, this list of conditions and the following disclaimer in 16 * the documentation and/or other materials provided with the distribution. 17 * 18 * c) Neither the name of Cisco Systems, Inc. nor the names of its 19 * contributors may be used to endorse or promote products derived 20 * from this software without specific prior written permission. 21 * 22 * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS 23 * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, 24 * THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 25 * ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR CONTRIBUTORS BE 26 * LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR 27 * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF 28 * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS 29 * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN 30 * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) 31 * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF 32 * THE POSSIBILITY OF SUCH DAMAGE. 33 */ 34 35 #include <netinet/sctp_os.h> 36 #ifdef INET6 37 #include <sys/proc.h> 38 #include <netinet/sctp_pcb.h> 39 #include <netinet/sctp_header.h> 40 #include <netinet/sctp_var.h> 41 #include <netinet6/sctp6_var.h> 42 #include <netinet/sctp_sysctl.h> 43 #include <netinet/sctp_output.h> 44 #include <netinet/sctp_uio.h> 45 #include <netinet/sctp_asconf.h> 46 #include <netinet/sctputil.h> 47 #include <netinet/sctp_indata.h> 48 #include <netinet/sctp_timer.h> 49 #include <netinet/sctp_auth.h> 50 #include <netinet/sctp_input.h> 51 #include <netinet/sctp_output.h> 52 #include <netinet/sctp_bsd_addr.h> 53 #include <netinet/sctp_crc32.h> 54 #include <netinet/icmp6.h> 55 #include <netinet/udp.h> 56 57 int 58 sctp6_input_with_port(struct mbuf **i_pak, int *offp, uint16_t port) 59 { 60 struct mbuf *m; 61 int iphlen; 62 uint32_t vrf_id; 63 uint8_t ecn_bits; 64 struct sockaddr_in6 src, dst; 65 struct ip6_hdr *ip6; 66 struct sctphdr *sh; 67 struct sctp_chunkhdr *ch; 68 int length, offset; 69 uint8_t compute_crc; 70 uint32_t mflowid; 71 uint8_t mflowtype; 72 uint16_t fibnum; 73 74 iphlen = *offp; 75 if (SCTP_GET_PKT_VRFID(*i_pak, vrf_id)) { 76 SCTP_RELEASE_PKT(*i_pak); 77 return (IPPROTO_DONE); 78 } 79 m = SCTP_HEADER_TO_CHAIN(*i_pak); 80 #ifdef SCTP_MBUF_LOGGING 81 /* Log in any input mbufs */ 82 if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_MBUF_LOGGING_ENABLE) { 83 sctp_log_mbc(m, SCTP_MBUF_INPUT); 84 } 85 #endif 86 #ifdef SCTP_PACKET_LOGGING 87 if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_LAST_PACKET_TRACING) { 88 sctp_packet_log(m); 89 } 90 #endif 91 SCTPDBG(SCTP_DEBUG_CRCOFFLOAD, 92 "sctp6_input(): Packet of length %d received on %s with csum_flags 0x%b.\n", 93 m->m_pkthdr.len, 94 if_name(m->m_pkthdr.rcvif), 95 (int)m->m_pkthdr.csum_flags, CSUM_BITS); 96 mflowid = m->m_pkthdr.flowid; 97 mflowtype = M_HASHTYPE_GET(m); 98 fibnum = M_GETFIB(m); 99 SCTP_STAT_INCR(sctps_recvpackets); 100 SCTP_STAT_INCR_COUNTER64(sctps_inpackets); 101 /* Get IP, SCTP, and first chunk header together in the first mbuf. */ 102 offset = iphlen + sizeof(struct sctphdr) + sizeof(struct sctp_chunkhdr); 103 if (m->m_len < offset) { 104 m = m_pullup(m, offset); 105 if (m == NULL) { 106 SCTP_STAT_INCR(sctps_hdrops); 107 return (IPPROTO_DONE); 108 } 109 } 110 ip6 = mtod(m, struct ip6_hdr *); 111 sh = (struct sctphdr *)(mtod(m, caddr_t)+iphlen); 112 ch = (struct sctp_chunkhdr *)((caddr_t)sh + sizeof(struct sctphdr)); 113 offset -= sizeof(struct sctp_chunkhdr); 114 memset(&src, 0, sizeof(struct sockaddr_in6)); 115 src.sin6_family = AF_INET6; 116 src.sin6_len = sizeof(struct sockaddr_in6); 117 src.sin6_port = sh->src_port; 118 src.sin6_addr = ip6->ip6_src; 119 if (in6_setscope(&src.sin6_addr, m->m_pkthdr.rcvif, NULL) != 0) { 120 goto out; 121 } 122 memset(&dst, 0, sizeof(struct sockaddr_in6)); 123 dst.sin6_family = AF_INET6; 124 dst.sin6_len = sizeof(struct sockaddr_in6); 125 dst.sin6_port = sh->dest_port; 126 dst.sin6_addr = ip6->ip6_dst; 127 if (in6_setscope(&dst.sin6_addr, m->m_pkthdr.rcvif, NULL) != 0) { 128 goto out; 129 } 130 length = ntohs(ip6->ip6_plen) + iphlen; 131 /* Validate mbuf chain length with IP payload length. */ 132 if (SCTP_HEADER_LEN(m) != length) { 133 SCTPDBG(SCTP_DEBUG_INPUT1, 134 "sctp6_input() length:%d reported length:%d\n", length, SCTP_HEADER_LEN(m)); 135 SCTP_STAT_INCR(sctps_hdrops); 136 goto out; 137 } 138 if (IN6_IS_ADDR_MULTICAST(&ip6->ip6_dst)) { 139 goto out; 140 } 141 ecn_bits = IPV6_TRAFFIC_CLASS(ip6); 142 if (m->m_pkthdr.csum_flags & (CSUM_SCTP_VALID | CSUM_IP6_SCTP)) { 143 /* 144 * Packet with CSUM_IP6_SCTP were sent from local host using 145 * checksum offloading. Checksum not required. 146 */ 147 SCTP_STAT_INCR(sctps_recvhwcrc); 148 compute_crc = 0; 149 } else { 150 SCTP_STAT_INCR(sctps_recvswcrc); 151 compute_crc = 1; 152 } 153 sctp_common_input_processing(&m, iphlen, offset, length, 154 (struct sockaddr *)&src, 155 (struct sockaddr *)&dst, 156 sh, ch, 157 compute_crc, 158 ecn_bits, 159 mflowtype, mflowid, fibnum, 160 vrf_id, port); 161 out: 162 if (m) { 163 sctp_m_freem(m); 164 } 165 return (IPPROTO_DONE); 166 } 167 168 int 169 sctp6_input(struct mbuf **i_pak, int *offp, int proto SCTP_UNUSED) 170 { 171 return (sctp6_input_with_port(i_pak, offp, 0)); 172 } 173 174 void 175 sctp6_notify(struct sctp_inpcb *inp, 176 struct sctp_tcb *stcb, 177 struct sctp_nets *net, 178 uint8_t icmp6_type, 179 uint8_t icmp6_code, 180 uint32_t next_mtu) 181 { 182 int timer_stopped; 183 184 switch (icmp6_type) { 185 case ICMP6_DST_UNREACH: 186 if ((icmp6_code == ICMP6_DST_UNREACH_NOROUTE) || 187 (icmp6_code == ICMP6_DST_UNREACH_ADMIN) || 188 (icmp6_code == ICMP6_DST_UNREACH_BEYONDSCOPE) || 189 (icmp6_code == ICMP6_DST_UNREACH_ADDR)) { 190 /* Mark the net unreachable. */ 191 if (net->dest_state & SCTP_ADDR_REACHABLE) { 192 /* Ok that destination is not reachable */ 193 net->dest_state &= ~SCTP_ADDR_REACHABLE; 194 net->dest_state &= ~SCTP_ADDR_PF; 195 sctp_ulp_notify(SCTP_NOTIFY_INTERFACE_DOWN, 196 stcb, 0, (void *)net, SCTP_SO_NOT_LOCKED); 197 } 198 } 199 SCTP_TCB_UNLOCK(stcb); 200 break; 201 case ICMP6_PARAM_PROB: 202 /* Treat it like an ABORT. */ 203 if (icmp6_code == ICMP6_PARAMPROB_NEXTHEADER) { 204 sctp_abort_notification(stcb, true, false, 0, NULL, SCTP_SO_NOT_LOCKED); 205 (void)sctp_free_assoc(inp, stcb, SCTP_NORMAL_PROC, 206 SCTP_FROM_SCTP_USRREQ + SCTP_LOC_2); 207 } else { 208 SCTP_TCB_UNLOCK(stcb); 209 } 210 break; 211 case ICMP6_PACKET_TOO_BIG: 212 if (net->dest_state & SCTP_ADDR_NO_PMTUD) { 213 SCTP_TCB_UNLOCK(stcb); 214 break; 215 } 216 if (SCTP_OS_TIMER_PENDING(&net->pmtu_timer.timer)) { 217 timer_stopped = 1; 218 sctp_timer_stop(SCTP_TIMER_TYPE_PATHMTURAISE, inp, stcb, net, 219 SCTP_FROM_SCTP_USRREQ + SCTP_LOC_1); 220 } else { 221 timer_stopped = 0; 222 } 223 /* Update the path MTU. */ 224 if (net->port) { 225 next_mtu -= sizeof(struct udphdr); 226 } 227 if (net->mtu > next_mtu) { 228 net->mtu = next_mtu; 229 if (net->port) { 230 sctp_hc_set_mtu(&net->ro._l_addr, inp->fibnum, next_mtu + sizeof(struct udphdr)); 231 } else { 232 sctp_hc_set_mtu(&net->ro._l_addr, inp->fibnum, next_mtu); 233 } 234 } 235 /* Update the association MTU */ 236 if (stcb->asoc.smallest_mtu > next_mtu) { 237 sctp_pathmtu_adjustment(stcb, next_mtu, true); 238 } 239 /* Finally, start the PMTU timer if it was running before. */ 240 if (timer_stopped) { 241 sctp_timer_start(SCTP_TIMER_TYPE_PATHMTURAISE, inp, stcb, net); 242 } 243 SCTP_TCB_UNLOCK(stcb); 244 break; 245 default: 246 SCTP_TCB_UNLOCK(stcb); 247 break; 248 } 249 } 250 251 void 252 sctp6_ctlinput(struct ip6ctlparam *ip6cp) 253 { 254 struct sctp_inpcb *inp; 255 struct sctp_tcb *stcb; 256 struct sctp_nets *net; 257 struct sctphdr sh; 258 struct sockaddr_in6 src, dst; 259 260 if (icmp6_errmap(ip6cp->ip6c_icmp6) == 0) { 261 return; 262 } 263 264 /* 265 * Check if we can safely examine the ports and the verification tag 266 * of the SCTP common header. 267 */ 268 if (ip6cp->ip6c_m->m_pkthdr.len < 269 (int32_t)(ip6cp->ip6c_off + offsetof(struct sctphdr, checksum))) { 270 return; 271 } 272 273 /* Copy out the port numbers and the verification tag. */ 274 memset(&sh, 0, sizeof(sh)); 275 m_copydata(ip6cp->ip6c_m, 276 ip6cp->ip6c_off, 277 sizeof(uint16_t) + sizeof(uint16_t) + sizeof(uint32_t), 278 (caddr_t)&sh); 279 memset(&src, 0, sizeof(struct sockaddr_in6)); 280 src.sin6_family = AF_INET6; 281 src.sin6_len = sizeof(struct sockaddr_in6); 282 src.sin6_port = sh.src_port; 283 src.sin6_addr = ip6cp->ip6c_ip6->ip6_src; 284 if (in6_setscope(&src.sin6_addr, ip6cp->ip6c_m->m_pkthdr.rcvif, NULL) != 0) { 285 return; 286 } 287 memset(&dst, 0, sizeof(struct sockaddr_in6)); 288 dst.sin6_family = AF_INET6; 289 dst.sin6_len = sizeof(struct sockaddr_in6); 290 dst.sin6_port = sh.dest_port; 291 dst.sin6_addr = ip6cp->ip6c_ip6->ip6_dst; 292 if (in6_setscope(&dst.sin6_addr, ip6cp->ip6c_m->m_pkthdr.rcvif, NULL) != 0) { 293 return; 294 } 295 inp = NULL; 296 net = NULL; 297 stcb = sctp_findassociation_addr_sa((struct sockaddr *)&dst, 298 (struct sockaddr *)&src, 299 &inp, &net, 1, SCTP_DEFAULT_VRFID); 300 if ((stcb != NULL) && 301 (net != NULL) && 302 (inp != NULL)) { 303 /* Check the verification tag */ 304 if (ntohl(sh.v_tag) != 0) { 305 /* 306 * This must be the verification tag used for 307 * sending out packets. We don't consider packets 308 * reflecting the verification tag. 309 */ 310 if (ntohl(sh.v_tag) != stcb->asoc.peer_vtag) { 311 SCTP_TCB_UNLOCK(stcb); 312 return; 313 } 314 } else { 315 if (ip6cp->ip6c_m->m_pkthdr.len >= 316 ip6cp->ip6c_off + sizeof(struct sctphdr) + 317 sizeof(struct sctp_chunkhdr) + 318 offsetof(struct sctp_init, a_rwnd)) { 319 /* 320 * In this case we can check if we got an 321 * INIT chunk and if the initiate tag 322 * matches. 323 */ 324 uint32_t initiate_tag; 325 uint8_t chunk_type; 326 327 m_copydata(ip6cp->ip6c_m, 328 ip6cp->ip6c_off + 329 sizeof(struct sctphdr), 330 sizeof(uint8_t), 331 (caddr_t)&chunk_type); 332 m_copydata(ip6cp->ip6c_m, 333 ip6cp->ip6c_off + 334 sizeof(struct sctphdr) + 335 sizeof(struct sctp_chunkhdr), 336 sizeof(uint32_t), 337 (caddr_t)&initiate_tag); 338 if ((chunk_type != SCTP_INITIATION) || 339 (ntohl(initiate_tag) != stcb->asoc.my_vtag)) { 340 SCTP_TCB_UNLOCK(stcb); 341 return; 342 } 343 } else { 344 SCTP_TCB_UNLOCK(stcb); 345 return; 346 } 347 } 348 sctp6_notify(inp, stcb, net, 349 ip6cp->ip6c_icmp6->icmp6_type, 350 ip6cp->ip6c_icmp6->icmp6_code, 351 ntohl(ip6cp->ip6c_icmp6->icmp6_mtu)); 352 } else { 353 if ((stcb == NULL) && (inp != NULL)) { 354 /* reduce inp's ref-count */ 355 SCTP_INP_WLOCK(inp); 356 SCTP_INP_DECR_REF(inp); 357 SCTP_INP_WUNLOCK(inp); 358 } 359 if (stcb) { 360 SCTP_TCB_UNLOCK(stcb); 361 } 362 } 363 } 364 365 /* 366 * this routine can probably be collapsed into the one in sctp_userreq.c 367 * since they do the same thing and now we lookup with a sockaddr 368 */ 369 static int 370 sctp6_getcred(SYSCTL_HANDLER_ARGS) 371 { 372 struct xucred xuc; 373 struct sockaddr_in6 addrs[2]; 374 struct sctp_inpcb *inp; 375 struct sctp_nets *net; 376 struct sctp_tcb *stcb; 377 int error; 378 uint32_t vrf_id; 379 380 vrf_id = SCTP_DEFAULT_VRFID; 381 382 if (req->newptr == NULL) 383 return (EINVAL); 384 error = priv_check(req->td, PRIV_NETINET_GETCRED); 385 if (error) 386 return (error); 387 388 if (req->newlen != sizeof(addrs)) { 389 SCTP_LTRACE_ERR_RET(NULL, NULL, NULL, SCTP_FROM_SCTP6_USRREQ, EINVAL); 390 return (EINVAL); 391 } 392 if (req->oldlen != sizeof(struct ucred)) { 393 SCTP_LTRACE_ERR_RET(NULL, NULL, NULL, SCTP_FROM_SCTP6_USRREQ, EINVAL); 394 return (EINVAL); 395 } 396 error = SYSCTL_IN(req, addrs, sizeof(addrs)); 397 if (error) 398 return (error); 399 400 stcb = sctp_findassociation_addr_sa(sin6tosa(&addrs[1]), 401 sin6tosa(&addrs[0]), 402 &inp, &net, 1, vrf_id); 403 if (stcb == NULL || inp == NULL || inp->sctp_socket == NULL) { 404 if ((inp != NULL) && (stcb == NULL)) { 405 /* reduce ref-count */ 406 SCTP_INP_WLOCK(inp); 407 SCTP_INP_DECR_REF(inp); 408 goto cred_can_cont; 409 } 410 SCTP_LTRACE_ERR_RET(inp, NULL, NULL, SCTP_FROM_SCTP6_USRREQ, ENOENT); 411 error = ENOENT; 412 goto out; 413 } 414 SCTP_TCB_UNLOCK(stcb); 415 /* 416 * We use the write lock here, only since in the error leg we need 417 * it. If we used RLOCK, then we would have to 418 * wlock/decr/unlock/rlock. Which in theory could create a hole. 419 * Better to use higher wlock. 420 */ 421 SCTP_INP_WLOCK(inp); 422 cred_can_cont: 423 error = cr_canseesocket(req->td->td_ucred, inp->sctp_socket); 424 if (error) { 425 SCTP_INP_WUNLOCK(inp); 426 goto out; 427 } 428 cru2x(inp->sctp_socket->so_cred, &xuc); 429 SCTP_INP_WUNLOCK(inp); 430 error = SYSCTL_OUT(req, &xuc, sizeof(struct xucred)); 431 out: 432 return (error); 433 } 434 435 SYSCTL_PROC(_net_inet6_sctp6, OID_AUTO, getcred, 436 CTLTYPE_OPAQUE | CTLFLAG_RW | CTLFLAG_NEEDGIANT, 437 0, 0, sctp6_getcred, "S,ucred", 438 "Get the ucred of a SCTP6 connection"); 439 440 static int 441 sctp6_attach(struct socket *so, int proto SCTP_UNUSED, struct thread *p SCTP_UNUSED) 442 { 443 int error; 444 struct sctp_inpcb *inp; 445 uint32_t vrf_id = SCTP_DEFAULT_VRFID; 446 447 inp = (struct sctp_inpcb *)so->so_pcb; 448 if (inp != NULL) { 449 SCTP_LTRACE_ERR_RET(inp, NULL, NULL, SCTP_FROM_SCTP6_USRREQ, EINVAL); 450 return (EINVAL); 451 } 452 453 if (so->so_snd.sb_hiwat == 0 || so->so_rcv.sb_hiwat == 0) { 454 error = SCTP_SORESERVE(so, SCTP_BASE_SYSCTL(sctp_sendspace), SCTP_BASE_SYSCTL(sctp_recvspace)); 455 if (error) 456 return (error); 457 } 458 error = sctp_inpcb_alloc(so, vrf_id); 459 if (error) 460 return (error); 461 inp = (struct sctp_inpcb *)so->so_pcb; 462 SCTP_INP_WLOCK(inp); 463 inp->sctp_flags |= SCTP_PCB_FLAGS_BOUND_V6; /* I'm v6! */ 464 465 inp->ip_inp.inp.inp_vflag |= INP_IPV6; 466 inp->ip_inp.inp.in6p_hops = -1; /* use kernel default */ 467 inp->ip_inp.inp.in6p_cksum = -1; /* just to be sure */ 468 #ifdef INET 469 /* 470 * XXX: ugly!! IPv4 TTL initialization is necessary for an IPv6 471 * socket as well, because the socket may be bound to an IPv6 472 * wildcard address, which may match an IPv4-mapped IPv6 address. 473 */ 474 inp->ip_inp.inp.inp_ip_ttl = MODULE_GLOBAL(ip_defttl); 475 #endif 476 SCTP_INP_WUNLOCK(inp); 477 return (0); 478 } 479 480 static int 481 sctp6_bind(struct socket *so, struct sockaddr *addr, struct thread *p) 482 { 483 struct sctp_inpcb *inp; 484 int error; 485 u_char vflagsav; 486 487 inp = (struct sctp_inpcb *)so->so_pcb; 488 if (inp == NULL) { 489 SCTP_LTRACE_ERR_RET(inp, NULL, NULL, SCTP_FROM_SCTP6_USRREQ, EINVAL); 490 return (EINVAL); 491 } 492 493 if (addr) { 494 switch (addr->sa_family) { 495 #ifdef INET 496 case AF_INET: 497 if (addr->sa_len != sizeof(struct sockaddr_in)) { 498 SCTP_LTRACE_ERR_RET(inp, NULL, NULL, SCTP_FROM_SCTP6_USRREQ, EINVAL); 499 return (EINVAL); 500 } 501 break; 502 #endif 503 #ifdef INET6 504 case AF_INET6: 505 if (addr->sa_len != sizeof(struct sockaddr_in6)) { 506 SCTP_LTRACE_ERR_RET(inp, NULL, NULL, SCTP_FROM_SCTP6_USRREQ, EINVAL); 507 return (EINVAL); 508 } 509 break; 510 #endif 511 default: 512 SCTP_LTRACE_ERR_RET(inp, NULL, NULL, SCTP_FROM_SCTP6_USRREQ, EINVAL); 513 return (EINVAL); 514 } 515 } 516 vflagsav = inp->ip_inp.inp.inp_vflag; 517 inp->ip_inp.inp.inp_vflag &= ~INP_IPV4; 518 inp->ip_inp.inp.inp_vflag |= INP_IPV6; 519 if ((addr != NULL) && (SCTP_IPV6_V6ONLY(inp) == 0)) { 520 switch (addr->sa_family) { 521 #ifdef INET 522 case AF_INET: 523 /* binding v4 addr to v6 socket, so reset flags */ 524 inp->ip_inp.inp.inp_vflag |= INP_IPV4; 525 inp->ip_inp.inp.inp_vflag &= ~INP_IPV6; 526 break; 527 #endif 528 #ifdef INET6 529 case AF_INET6: 530 { 531 struct sockaddr_in6 *sin6_p; 532 533 sin6_p = (struct sockaddr_in6 *)addr; 534 535 if (IN6_IS_ADDR_UNSPECIFIED(&sin6_p->sin6_addr)) { 536 inp->ip_inp.inp.inp_vflag |= INP_IPV4; 537 } 538 #ifdef INET 539 if (IN6_IS_ADDR_V4MAPPED(&sin6_p->sin6_addr)) { 540 struct sockaddr_in sin; 541 542 in6_sin6_2_sin(&sin, sin6_p); 543 inp->ip_inp.inp.inp_vflag |= INP_IPV4; 544 inp->ip_inp.inp.inp_vflag &= ~INP_IPV6; 545 error = sctp_inpcb_bind(so, (struct sockaddr *)&sin, NULL, p); 546 goto out; 547 } 548 #endif 549 break; 550 } 551 #endif 552 default: 553 break; 554 } 555 } else if (addr != NULL) { 556 struct sockaddr_in6 *sin6_p; 557 558 /* IPV6_V6ONLY socket */ 559 #ifdef INET 560 if (addr->sa_family == AF_INET) { 561 /* can't bind v4 addr to v6 only socket! */ 562 SCTP_LTRACE_ERR_RET(inp, NULL, NULL, SCTP_FROM_SCTP6_USRREQ, EINVAL); 563 error = EINVAL; 564 goto out; 565 } 566 #endif 567 sin6_p = (struct sockaddr_in6 *)addr; 568 569 if (IN6_IS_ADDR_V4MAPPED(&sin6_p->sin6_addr)) { 570 /* can't bind v4-mapped addrs either! */ 571 /* NOTE: we don't support SIIT */ 572 SCTP_LTRACE_ERR_RET(inp, NULL, NULL, SCTP_FROM_SCTP6_USRREQ, EINVAL); 573 error = EINVAL; 574 goto out; 575 } 576 } 577 error = sctp_inpcb_bind(so, addr, NULL, p); 578 out: 579 if (error != 0) 580 inp->ip_inp.inp.inp_vflag = vflagsav; 581 return (error); 582 } 583 584 static void 585 sctp6_close(struct socket *so) 586 { 587 sctp_close(so); 588 } 589 590 /* This could be made common with sctp_detach() since they are identical */ 591 592 int 593 sctp_sendm(struct socket *so, int flags, struct mbuf *m, struct sockaddr *addr, 594 struct mbuf *control, struct thread *p); 595 596 static int 597 sctp6_send(struct socket *so, int flags, struct mbuf *m, struct sockaddr *addr, 598 struct mbuf *control, struct thread *p) 599 { 600 struct sctp_inpcb *inp; 601 602 #ifdef INET 603 struct sockaddr_in6 *sin6; 604 #endif /* INET */ 605 /* No SPL needed since sctp_output does this */ 606 607 inp = (struct sctp_inpcb *)so->so_pcb; 608 if (inp == NULL) { 609 if (control) { 610 SCTP_RELEASE_PKT(control); 611 control = NULL; 612 } 613 SCTP_RELEASE_PKT(m); 614 SCTP_LTRACE_ERR_RET(inp, NULL, NULL, SCTP_FROM_SCTP6_USRREQ, EINVAL); 615 return (EINVAL); 616 } 617 /* 618 * For the TCP model we may get a NULL addr, if we are a connected 619 * socket thats ok. 620 */ 621 if ((inp->sctp_flags & SCTP_PCB_FLAGS_CONNECTED) && 622 (addr == NULL)) { 623 goto connected_type; 624 } 625 if (addr == NULL) { 626 SCTP_RELEASE_PKT(m); 627 if (control) { 628 SCTP_RELEASE_PKT(control); 629 control = NULL; 630 } 631 SCTP_LTRACE_ERR_RET(inp, NULL, NULL, SCTP_FROM_SCTP6_USRREQ, EDESTADDRREQ); 632 return (EDESTADDRREQ); 633 } 634 switch (addr->sa_family) { 635 #ifdef INET 636 case AF_INET: 637 if (addr->sa_len != sizeof(struct sockaddr_in)) { 638 if (control) { 639 SCTP_RELEASE_PKT(control); 640 control = NULL; 641 } 642 SCTP_RELEASE_PKT(m); 643 SCTP_LTRACE_ERR_RET(inp, NULL, NULL, SCTP_FROM_SCTP6_USRREQ, EINVAL); 644 return (EINVAL); 645 } 646 break; 647 #endif 648 #ifdef INET6 649 case AF_INET6: 650 if (addr->sa_len != sizeof(struct sockaddr_in6)) { 651 if (control) { 652 SCTP_RELEASE_PKT(control); 653 control = NULL; 654 } 655 SCTP_RELEASE_PKT(m); 656 SCTP_LTRACE_ERR_RET(inp, NULL, NULL, SCTP_FROM_SCTP6_USRREQ, EINVAL); 657 return (EINVAL); 658 } 659 break; 660 #endif 661 default: 662 if (control) { 663 SCTP_RELEASE_PKT(control); 664 control = NULL; 665 } 666 SCTP_RELEASE_PKT(m); 667 SCTP_LTRACE_ERR_RET(inp, NULL, NULL, SCTP_FROM_SCTP6_USRREQ, EINVAL); 668 return (EINVAL); 669 } 670 #ifdef INET 671 sin6 = (struct sockaddr_in6 *)addr; 672 if (SCTP_IPV6_V6ONLY(inp)) { 673 /* 674 * if IPV6_V6ONLY flag, we discard datagrams destined to a 675 * v4 addr or v4-mapped addr 676 */ 677 if (addr->sa_family == AF_INET) { 678 if (control) { 679 SCTP_RELEASE_PKT(control); 680 control = NULL; 681 } 682 SCTP_RELEASE_PKT(m); 683 SCTP_LTRACE_ERR_RET(inp, NULL, NULL, SCTP_FROM_SCTP6_USRREQ, EINVAL); 684 return (EINVAL); 685 } 686 if (IN6_IS_ADDR_V4MAPPED(&sin6->sin6_addr)) { 687 if (control) { 688 SCTP_RELEASE_PKT(control); 689 control = NULL; 690 } 691 SCTP_RELEASE_PKT(m); 692 SCTP_LTRACE_ERR_RET(inp, NULL, NULL, SCTP_FROM_SCTP6_USRREQ, EINVAL); 693 return (EINVAL); 694 } 695 } 696 if ((addr->sa_family == AF_INET6) && 697 IN6_IS_ADDR_V4MAPPED(&sin6->sin6_addr)) { 698 struct sockaddr_in sin; 699 700 /* convert v4-mapped into v4 addr and send */ 701 in6_sin6_2_sin(&sin, sin6); 702 return (sctp_sendm(so, flags, m, (struct sockaddr *)&sin, control, p)); 703 } 704 #endif /* INET */ 705 connected_type: 706 /* now what about control */ 707 if (control) { 708 if (inp->control) { 709 SCTP_PRINTF("huh? control set?\n"); 710 SCTP_RELEASE_PKT(inp->control); 711 inp->control = NULL; 712 } 713 inp->control = control; 714 } 715 /* Place the data */ 716 if (inp->pkt) { 717 SCTP_BUF_NEXT(inp->pkt_last) = m; 718 inp->pkt_last = m; 719 } else { 720 inp->pkt_last = inp->pkt = m; 721 } 722 if ( 723 /* FreeBSD and MacOSX uses a flag passed */ 724 ((flags & PRUS_MORETOCOME) == 0) 725 ) { 726 /* 727 * note with the current version this code will only be used 728 * by OpenBSD, NetBSD and FreeBSD have methods for 729 * re-defining sosend() to use sctp_sosend(). One can 730 * optionally switch back to this code (by changing back the 731 * definitions but this is not advisable. 732 */ 733 struct epoch_tracker et; 734 int ret; 735 736 NET_EPOCH_ENTER(et); 737 ret = sctp_output(inp, inp->pkt, addr, inp->control, p, flags); 738 NET_EPOCH_EXIT(et); 739 inp->pkt = NULL; 740 inp->control = NULL; 741 return (ret); 742 } else { 743 return (0); 744 } 745 } 746 747 static int 748 sctp6_connect(struct socket *so, struct sockaddr *addr, struct thread *p) 749 { 750 struct epoch_tracker et; 751 uint32_t vrf_id; 752 int error = 0; 753 struct sctp_inpcb *inp; 754 struct sctp_tcb *stcb; 755 #ifdef INET 756 struct sockaddr_in6 *sin6; 757 union sctp_sockstore store; 758 #endif 759 760 inp = (struct sctp_inpcb *)so->so_pcb; 761 if (inp == NULL) { 762 SCTP_LTRACE_ERR_RET(inp, NULL, NULL, SCTP_FROM_SCTP6_USRREQ, ECONNRESET); 763 return (ECONNRESET); /* I made the same as TCP since we are 764 * not setup? */ 765 } 766 if (addr == NULL) { 767 SCTP_LTRACE_ERR_RET(inp, NULL, NULL, SCTP_FROM_SCTP6_USRREQ, EINVAL); 768 return (EINVAL); 769 } 770 switch (addr->sa_family) { 771 #ifdef INET 772 case AF_INET: 773 if (addr->sa_len != sizeof(struct sockaddr_in)) { 774 SCTP_LTRACE_ERR_RET(inp, NULL, NULL, SCTP_FROM_SCTP6_USRREQ, EINVAL); 775 return (EINVAL); 776 } 777 break; 778 #endif 779 #ifdef INET6 780 case AF_INET6: 781 if (addr->sa_len != sizeof(struct sockaddr_in6)) { 782 SCTP_LTRACE_ERR_RET(inp, NULL, NULL, SCTP_FROM_SCTP6_USRREQ, EINVAL); 783 return (EINVAL); 784 } 785 break; 786 #endif 787 default: 788 SCTP_LTRACE_ERR_RET(inp, NULL, NULL, SCTP_FROM_SCTP6_USRREQ, EINVAL); 789 return (EINVAL); 790 } 791 792 vrf_id = inp->def_vrf_id; 793 SCTP_ASOC_CREATE_LOCK(inp); 794 SCTP_INP_RLOCK(inp); 795 if ((inp->sctp_flags & SCTP_PCB_FLAGS_UNBOUND) == 796 SCTP_PCB_FLAGS_UNBOUND) { 797 /* Bind a ephemeral port */ 798 SCTP_INP_RUNLOCK(inp); 799 error = sctp6_bind(so, NULL, p); 800 if (error) { 801 SCTP_ASOC_CREATE_UNLOCK(inp); 802 803 return (error); 804 } 805 SCTP_INP_RLOCK(inp); 806 } 807 if ((inp->sctp_flags & SCTP_PCB_FLAGS_TCPTYPE) && 808 (inp->sctp_flags & SCTP_PCB_FLAGS_CONNECTED)) { 809 /* We are already connected AND the TCP model */ 810 SCTP_INP_RUNLOCK(inp); 811 SCTP_ASOC_CREATE_UNLOCK(inp); 812 SCTP_LTRACE_ERR_RET(inp, NULL, NULL, SCTP_FROM_SCTP6_USRREQ, EADDRINUSE); 813 return (EADDRINUSE); 814 } 815 #ifdef INET 816 sin6 = (struct sockaddr_in6 *)addr; 817 if (SCTP_IPV6_V6ONLY(inp)) { 818 /* 819 * if IPV6_V6ONLY flag, ignore connections destined to a v4 820 * addr or v4-mapped addr 821 */ 822 if (addr->sa_family == AF_INET) { 823 SCTP_INP_RUNLOCK(inp); 824 SCTP_ASOC_CREATE_UNLOCK(inp); 825 SCTP_LTRACE_ERR_RET(inp, NULL, NULL, SCTP_FROM_SCTP6_USRREQ, EINVAL); 826 return (EINVAL); 827 } 828 if (IN6_IS_ADDR_V4MAPPED(&sin6->sin6_addr)) { 829 SCTP_INP_RUNLOCK(inp); 830 SCTP_ASOC_CREATE_UNLOCK(inp); 831 SCTP_LTRACE_ERR_RET(inp, NULL, NULL, SCTP_FROM_SCTP6_USRREQ, EINVAL); 832 return (EINVAL); 833 } 834 } 835 if ((addr->sa_family == AF_INET6) && 836 IN6_IS_ADDR_V4MAPPED(&sin6->sin6_addr)) { 837 /* convert v4-mapped into v4 addr */ 838 in6_sin6_2_sin(&store.sin, sin6); 839 addr = &store.sa; 840 } 841 #endif /* INET */ 842 /* Now do we connect? */ 843 if (inp->sctp_flags & SCTP_PCB_FLAGS_CONNECTED) { 844 stcb = LIST_FIRST(&inp->sctp_asoc_list); 845 if (stcb) { 846 SCTP_TCB_LOCK(stcb); 847 } 848 SCTP_INP_RUNLOCK(inp); 849 } else { 850 SCTP_INP_RUNLOCK(inp); 851 SCTP_INP_WLOCK(inp); 852 SCTP_INP_INCR_REF(inp); 853 SCTP_INP_WUNLOCK(inp); 854 stcb = sctp_findassociation_ep_addr(&inp, addr, NULL, NULL, NULL); 855 if (stcb == NULL) { 856 SCTP_INP_WLOCK(inp); 857 SCTP_INP_DECR_REF(inp); 858 SCTP_INP_WUNLOCK(inp); 859 } 860 } 861 862 if (stcb != NULL) { 863 /* Already have or am bring up an association */ 864 SCTP_ASOC_CREATE_UNLOCK(inp); 865 SCTP_TCB_UNLOCK(stcb); 866 SCTP_LTRACE_ERR_RET(inp, NULL, NULL, SCTP_FROM_SCTP6_USRREQ, EALREADY); 867 return (EALREADY); 868 } 869 /* We are GOOD to go */ 870 stcb = sctp_aloc_assoc_connected(inp, addr, &error, 0, 0, vrf_id, 871 inp->sctp_ep.pre_open_stream_count, 872 inp->sctp_ep.port, p, 873 SCTP_INITIALIZE_AUTH_PARAMS); 874 SCTP_ASOC_CREATE_UNLOCK(inp); 875 if (stcb == NULL) { 876 /* Gak! no memory */ 877 return (error); 878 } 879 SCTP_SET_STATE(stcb, SCTP_STATE_COOKIE_WAIT); 880 (void)SCTP_GETTIME_TIMEVAL(&stcb->asoc.time_entered); 881 NET_EPOCH_ENTER(et); 882 sctp_send_initiate(inp, stcb, SCTP_SO_LOCKED); 883 SCTP_TCB_UNLOCK(stcb); 884 NET_EPOCH_EXIT(et); 885 return (error); 886 } 887 888 static int 889 sctp6_getaddr(struct socket *so, struct sockaddr *sa) 890 { 891 struct sockaddr_in6 *sin6 = (struct sockaddr_in6 *)sa; 892 struct sctp_inpcb *inp; 893 uint32_t vrf_id; 894 struct sctp_ifa *sctp_ifa; 895 int error; 896 897 *sin6 = (struct sockaddr_in6 ){ 898 .sin6_len = sizeof(struct sockaddr_in6), 899 .sin6_family = AF_INET6, 900 }; 901 902 inp = (struct sctp_inpcb *)so->so_pcb; 903 if (inp == NULL) { 904 SCTP_LTRACE_ERR_RET(inp, NULL, NULL, SCTP_FROM_SCTP6_USRREQ, ECONNRESET); 905 return (ECONNRESET); 906 } 907 SCTP_INP_RLOCK(inp); 908 sin6->sin6_port = inp->sctp_lport; 909 if (inp->sctp_flags & SCTP_PCB_FLAGS_BOUNDALL) { 910 /* For the bound all case you get back 0 */ 911 if (inp->sctp_flags & SCTP_PCB_FLAGS_CONNECTED) { 912 struct sctp_tcb *stcb; 913 struct sockaddr_in6 *sin_a6; 914 struct sctp_nets *net; 915 int fnd; 916 917 stcb = LIST_FIRST(&inp->sctp_asoc_list); 918 if (stcb == NULL) { 919 SCTP_INP_RUNLOCK(inp); 920 SCTP_LTRACE_ERR_RET(inp, NULL, NULL, SCTP_FROM_SCTP6_USRREQ, ENOENT); 921 return (ENOENT); 922 } 923 fnd = 0; 924 sin_a6 = NULL; 925 TAILQ_FOREACH(net, &stcb->asoc.nets, sctp_next) { 926 sin_a6 = (struct sockaddr_in6 *)&net->ro._l_addr; 927 if (sin_a6 == NULL) 928 /* this will make coverity happy */ 929 continue; 930 931 if (sin_a6->sin6_family == AF_INET6) { 932 fnd = 1; 933 break; 934 } 935 } 936 if ((!fnd) || (sin_a6 == NULL)) { 937 /* punt */ 938 SCTP_INP_RUNLOCK(inp); 939 SCTP_LTRACE_ERR_RET(inp, NULL, NULL, SCTP_FROM_SCTP6_USRREQ, ENOENT); 940 return (ENOENT); 941 } 942 vrf_id = inp->def_vrf_id; 943 sctp_ifa = sctp_source_address_selection(inp, stcb, (sctp_route_t *)&net->ro, net, 0, vrf_id); 944 if (sctp_ifa) { 945 sin6->sin6_addr = sctp_ifa->address.sin6.sin6_addr; 946 } 947 } else { 948 /* For the bound all case you get back 0 */ 949 memset(&sin6->sin6_addr, 0, sizeof(sin6->sin6_addr)); 950 } 951 } else { 952 /* Take the first IPv6 address in the list */ 953 struct sctp_laddr *laddr; 954 int fnd = 0; 955 956 LIST_FOREACH(laddr, &inp->sctp_addr_list, sctp_nxt_addr) { 957 if (laddr->ifa->address.sa.sa_family == AF_INET6) { 958 struct sockaddr_in6 *sin_a; 959 960 sin_a = &laddr->ifa->address.sin6; 961 sin6->sin6_addr = sin_a->sin6_addr; 962 fnd = 1; 963 break; 964 } 965 } 966 if (!fnd) { 967 SCTP_INP_RUNLOCK(inp); 968 SCTP_LTRACE_ERR_RET(inp, NULL, NULL, SCTP_FROM_SCTP6_USRREQ, ENOENT); 969 return (ENOENT); 970 } 971 } 972 SCTP_INP_RUNLOCK(inp); 973 /* Scoping things for v6 */ 974 if ((error = sa6_recoverscope(sin6)) != 0) { 975 return (error); 976 } 977 978 return (0); 979 } 980 981 static int 982 sctp6_peeraddr(struct socket *so, struct sockaddr *sa) 983 { 984 struct sockaddr_in6 *sin6 = (struct sockaddr_in6 *)sa; 985 int fnd; 986 struct sockaddr_in6 *sin_a6; 987 struct sctp_inpcb *inp; 988 struct sctp_tcb *stcb; 989 struct sctp_nets *net; 990 int error; 991 992 *sin6 = (struct sockaddr_in6 ){ 993 .sin6_len = sizeof(struct sockaddr_in6), 994 .sin6_family = AF_INET6, 995 }; 996 997 inp = (struct sctp_inpcb *)so->so_pcb; 998 if ((inp == NULL) || 999 ((inp->sctp_flags & SCTP_PCB_FLAGS_CONNECTED) == 0)) { 1000 /* UDP type and listeners will drop out here */ 1001 SCTP_LTRACE_ERR_RET(inp, NULL, NULL, SCTP_FROM_SCTP6_USRREQ, ENOTCONN); 1002 return (ENOTCONN); 1003 } 1004 SCTP_INP_RLOCK(inp); 1005 stcb = LIST_FIRST(&inp->sctp_asoc_list); 1006 if (stcb) { 1007 SCTP_TCB_LOCK(stcb); 1008 } 1009 SCTP_INP_RUNLOCK(inp); 1010 if (stcb == NULL) { 1011 SCTP_LTRACE_ERR_RET(inp, NULL, NULL, SCTP_FROM_SCTP6_USRREQ, ECONNRESET); 1012 return (ECONNRESET); 1013 } 1014 fnd = 0; 1015 TAILQ_FOREACH(net, &stcb->asoc.nets, sctp_next) { 1016 sin_a6 = (struct sockaddr_in6 *)&net->ro._l_addr; 1017 if (sin_a6->sin6_family == AF_INET6) { 1018 fnd = 1; 1019 sin6->sin6_port = stcb->rport; 1020 sin6->sin6_addr = sin_a6->sin6_addr; 1021 break; 1022 } 1023 } 1024 SCTP_TCB_UNLOCK(stcb); 1025 if (!fnd) { 1026 /* No IPv4 address */ 1027 SCTP_LTRACE_ERR_RET(inp, NULL, NULL, SCTP_FROM_SCTP6_USRREQ, ENOENT); 1028 return (ENOENT); 1029 } 1030 if ((error = sa6_recoverscope(sin6)) != 0) { 1031 SCTP_LTRACE_ERR_RET(inp, NULL, NULL, SCTP_FROM_SCTP6_USRREQ, error); 1032 return (error); 1033 } 1034 1035 return (0); 1036 } 1037 1038 static int 1039 sctp6_in6getaddr(struct socket *so, struct sockaddr *sa) 1040 { 1041 struct inpcb *inp = sotoinpcb(so); 1042 int error; 1043 1044 if (inp == NULL) { 1045 SCTP_LTRACE_ERR_RET(NULL, NULL, NULL, SCTP_FROM_SCTP6_USRREQ, EINVAL); 1046 return (EINVAL); 1047 } 1048 1049 /* allow v6 addresses precedence */ 1050 error = sctp6_getaddr(so, sa); 1051 #ifdef INET 1052 if (error) { 1053 struct sockaddr_in sin; 1054 1055 /* try v4 next if v6 failed */ 1056 error = sctp_ingetaddr(so, (struct sockaddr *)&sin); 1057 if (error) 1058 return (error); 1059 in6_sin_2_v4mapsin6(&sin, (struct sockaddr_in6 *)sa); 1060 } 1061 #endif 1062 return (error); 1063 } 1064 1065 static int 1066 sctp6_getpeeraddr(struct socket *so, struct sockaddr *sa) 1067 { 1068 struct inpcb *inp = sotoinpcb(so); 1069 int error; 1070 1071 if (inp == NULL) { 1072 SCTP_LTRACE_ERR_RET(NULL, NULL, NULL, SCTP_FROM_SCTP6_USRREQ, EINVAL); 1073 return (EINVAL); 1074 } 1075 1076 /* allow v6 addresses precedence */ 1077 error = sctp6_peeraddr(so, sa); 1078 #ifdef INET 1079 if (error) { 1080 struct sockaddr_in sin; 1081 1082 /* try v4 next if v6 failed */ 1083 error = sctp_peeraddr(so, (struct sockaddr *)&sin); 1084 if (error) 1085 return (error); 1086 in6_sin_2_v4mapsin6(&sin, (struct sockaddr_in6 *)sa); 1087 } 1088 #endif 1089 return (error); 1090 } 1091 1092 #define SCTP6_PROTOSW \ 1093 .pr_protocol = IPPROTO_SCTP, \ 1094 .pr_ctloutput = sctp_ctloutput, \ 1095 .pr_abort = sctp_abort, \ 1096 .pr_accept = sctp_accept, \ 1097 .pr_attach = sctp6_attach, \ 1098 .pr_bind = sctp6_bind, \ 1099 .pr_connect = sctp6_connect, \ 1100 .pr_control = in6_control, \ 1101 .pr_close = sctp6_close, \ 1102 .pr_detach = sctp6_close, \ 1103 .pr_disconnect = sctp_disconnect, \ 1104 .pr_listen = sctp_listen, \ 1105 .pr_peeraddr = sctp6_getpeeraddr, \ 1106 .pr_send = sctp6_send, \ 1107 .pr_shutdown = sctp_shutdown, \ 1108 .pr_sockaddr = sctp6_in6getaddr, \ 1109 .pr_sosend = sctp_sosend, \ 1110 .pr_soreceive = sctp_soreceive 1111 1112 struct protosw sctp6_seqpacket_protosw = { 1113 .pr_type = SOCK_SEQPACKET, 1114 .pr_flags = PR_WANTRCVD, 1115 SCTP6_PROTOSW 1116 }; 1117 1118 struct protosw sctp6_stream_protosw = { 1119 .pr_type = SOCK_STREAM, 1120 .pr_flags = PR_CONNREQUIRED | PR_WANTRCVD, 1121 SCTP6_PROTOSW 1122 }; 1123 #endif 1124