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