1 /*- 2 * SPDX-License-Identifier: BSD-3-Clause 3 * 4 * Copyright (C) 1995, 1996, 1997, and 1998 WIDE Project. 5 * Copyright (c) 2010-2011 Juniper Networks, Inc. 6 * Copyright (c) 2014 Kevin Lo 7 * All rights reserved. 8 * 9 * Portions of this software were developed by Robert N. M. Watson under 10 * contract to Juniper Networks, Inc. 11 * 12 * Redistribution and use in source and binary forms, with or without 13 * modification, are permitted provided that the following conditions 14 * are met: 15 * 1. Redistributions of source code must retain the above copyright 16 * notice, this list of conditions and the following disclaimer. 17 * 2. Redistributions in binary form must reproduce the above copyright 18 * notice, this list of conditions and the following disclaimer in the 19 * documentation and/or other materials provided with the distribution. 20 * 3. Neither the name of the project nor the names of its contributors 21 * may be used to endorse or promote products derived from this software 22 * without specific prior written permission. 23 * 24 * THIS SOFTWARE IS PROVIDED BY THE PROJECT AND CONTRIBUTORS ``AS IS'' AND 25 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 26 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 27 * ARE DISCLAIMED. IN NO EVENT SHALL THE PROJECT OR CONTRIBUTORS BE LIABLE 28 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 29 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 30 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 31 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 32 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 33 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 34 * SUCH DAMAGE. 35 * 36 * $KAME: udp6_usrreq.c,v 1.27 2001/05/21 05:45:10 jinmei Exp $ 37 * $KAME: udp6_output.c,v 1.31 2001/05/21 16:39:15 jinmei Exp $ 38 */ 39 40 /*- 41 * Copyright (c) 1982, 1986, 1988, 1990, 1993, 1995 42 * The Regents of the University of California. 43 * All rights reserved. 44 * 45 * Redistribution and use in source and binary forms, with or without 46 * modification, are permitted provided that the following conditions 47 * are met: 48 * 1. Redistributions of source code must retain the above copyright 49 * notice, this list of conditions and the following disclaimer. 50 * 2. Redistributions in binary form must reproduce the above copyright 51 * notice, this list of conditions and the following disclaimer in the 52 * documentation and/or other materials provided with the distribution. 53 * 3. Neither the name of the University nor the names of its contributors 54 * may be used to endorse or promote products derived from this software 55 * without specific prior written permission. 56 * 57 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND 58 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 59 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 60 * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE 61 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 62 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 63 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 64 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 65 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 66 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 67 * SUCH DAMAGE. 68 * 69 * @(#)udp_usrreq.c 8.6 (Berkeley) 5/23/95 70 */ 71 72 #include <sys/cdefs.h> 73 __FBSDID("$FreeBSD$"); 74 75 #include "opt_inet.h" 76 #include "opt_inet6.h" 77 #include "opt_ipsec.h" 78 #include "opt_route.h" 79 #include "opt_rss.h" 80 81 #include <sys/param.h> 82 #include <sys/jail.h> 83 #include <sys/kernel.h> 84 #include <sys/lock.h> 85 #include <sys/mbuf.h> 86 #include <sys/priv.h> 87 #include <sys/proc.h> 88 #include <sys/protosw.h> 89 #include <sys/sdt.h> 90 #include <sys/signalvar.h> 91 #include <sys/socket.h> 92 #include <sys/socketvar.h> 93 #include <sys/sx.h> 94 #include <sys/sysctl.h> 95 #include <sys/syslog.h> 96 #include <sys/systm.h> 97 98 #include <net/if.h> 99 #include <net/if_var.h> 100 #include <net/if_types.h> 101 #include <net/route.h> 102 #include <net/rss_config.h> 103 104 #include <netinet/in.h> 105 #include <netinet/in_kdtrace.h> 106 #include <netinet/in_pcb.h> 107 #include <netinet/in_systm.h> 108 #include <netinet/in_var.h> 109 #include <netinet/ip.h> 110 #include <netinet/ip6.h> 111 #include <netinet/icmp6.h> 112 #include <netinet/ip_var.h> 113 #include <netinet/udp.h> 114 #include <netinet/udp_var.h> 115 #include <netinet/udplite.h> 116 117 #include <netinet6/ip6protosw.h> 118 #include <netinet6/ip6_var.h> 119 #include <netinet6/in6_fib.h> 120 #include <netinet6/in6_pcb.h> 121 #include <netinet6/in6_rss.h> 122 #include <netinet6/udp6_var.h> 123 #include <netinet6/scope6_var.h> 124 125 #include <netipsec/ipsec_support.h> 126 127 #include <security/mac/mac_framework.h> 128 129 VNET_DEFINE(int, zero_checksum_port) = 0; 130 #define V_zero_checksum_port VNET(zero_checksum_port) 131 SYSCTL_INT(_net_inet6_udp6, OID_AUTO, rfc6935_port, CTLFLAG_VNET | CTLFLAG_RW, 132 &VNET_NAME(zero_checksum_port), 0, 133 "Zero UDP checksum allowed for traffic to/from this port."); 134 135 136 /* netinet/udp_usrreqs.c */ 137 pr_abort_t udp_abort; 138 pr_disconnect_t udp_disconnect; 139 pr_send_t udp_send; 140 141 /* 142 * UDP protocol implementation. 143 * Per RFC 768, August, 1980. 144 */ 145 146 static void udp6_detach(struct socket *so); 147 148 static int 149 udp6_append(struct inpcb *inp, struct mbuf *n, int off, 150 struct sockaddr_in6 *fromsa) 151 { 152 struct socket *so; 153 struct mbuf *opts = NULL, *tmp_opts; 154 struct udpcb *up; 155 bool filtered; 156 157 INP_LOCK_ASSERT(inp); 158 159 /* 160 * Engage the tunneling protocol. 161 */ 162 up = intoudpcb(inp); 163 if (up->u_tun_func != NULL) { 164 in_pcbref(inp); 165 INP_RUNLOCK(inp); 166 filtered = (*up->u_tun_func)(n, off, inp, 167 (struct sockaddr *)&fromsa[0], up->u_tun_ctx); 168 INP_RLOCK(inp); 169 if (filtered) 170 return (in_pcbrele_rlocked(inp)); 171 } 172 #if defined(IPSEC) || defined(IPSEC_SUPPORT) 173 /* Check AH/ESP integrity. */ 174 if (IPSEC_ENABLED(ipv6)) { 175 if (IPSEC_CHECK_POLICY(ipv6, n, inp) != 0) { 176 m_freem(n); 177 return (0); 178 } 179 } 180 #endif /* IPSEC */ 181 #ifdef MAC 182 if (mac_inpcb_check_deliver(inp, n) != 0) { 183 m_freem(n); 184 return (0); 185 } 186 #endif 187 opts = NULL; 188 if (inp->inp_flags & INP_CONTROLOPTS || 189 inp->inp_socket->so_options & SO_TIMESTAMP) 190 ip6_savecontrol(inp, n, &opts); 191 if ((inp->inp_vflag & INP_IPV6) && (inp->inp_flags2 & INP_ORIGDSTADDR)) { 192 tmp_opts = sbcreatecontrol(&fromsa[1], 193 sizeof(struct sockaddr_in6), IPV6_ORIGDSTADDR, 194 IPPROTO_IPV6, M_NOWAIT); 195 if (tmp_opts) { 196 if (opts) { 197 tmp_opts->m_next = opts; 198 opts = tmp_opts; 199 } else 200 opts = tmp_opts; 201 } 202 } 203 m_adj(n, off + sizeof(struct udphdr)); 204 205 so = inp->inp_socket; 206 SOCKBUF_LOCK(&so->so_rcv); 207 if (sbappendaddr_locked(&so->so_rcv, (struct sockaddr *)&fromsa[0], n, 208 opts) == 0) { 209 soroverflow_locked(so); 210 m_freem(n); 211 if (opts) 212 m_freem(opts); 213 UDPSTAT_INC(udps_fullsock); 214 } else 215 sorwakeup_locked(so); 216 return (0); 217 } 218 219 struct udp6_multi_match_ctx { 220 struct ip6_hdr *ip6; 221 struct udphdr *uh; 222 }; 223 224 static bool 225 udp6_multi_match(const struct inpcb *inp, void *v) 226 { 227 struct udp6_multi_match_ctx *ctx = v; 228 229 if ((inp->inp_vflag & INP_IPV6) == 0) 230 return(false); 231 if (inp->inp_lport != ctx->uh->uh_dport) 232 return(false); 233 if (inp->inp_fport != 0 && inp->inp_fport != ctx->uh->uh_sport) 234 return(false); 235 if (!IN6_IS_ADDR_UNSPECIFIED(&inp->in6p_laddr) && 236 !IN6_ARE_ADDR_EQUAL(&inp->in6p_laddr, &ctx->ip6->ip6_dst)) 237 return (false); 238 if (!IN6_IS_ADDR_UNSPECIFIED(&inp->in6p_faddr) && 239 (!IN6_ARE_ADDR_EQUAL(&inp->in6p_faddr, &ctx->ip6->ip6_src) || 240 inp->inp_fport != ctx->uh->uh_sport)) 241 return (false); 242 243 return (true); 244 } 245 246 static int 247 udp6_multi_input(struct mbuf *m, int off, int proto, 248 struct sockaddr_in6 *fromsa) 249 { 250 struct udp6_multi_match_ctx ctx; 251 struct inpcb_iterator inpi = INP_ITERATOR(udp_get_inpcbinfo(proto), 252 INPLOOKUP_RLOCKPCB, udp6_multi_match, &ctx); 253 struct inpcb *inp; 254 struct ip6_moptions *imo; 255 struct mbuf *n; 256 int appends = 0; 257 258 /* 259 * In the event that laddr should be set to the link-local 260 * address (this happens in RIPng), the multicast address 261 * specified in the received packet will not match laddr. To 262 * handle this situation, matching is relaxed if the 263 * receiving interface is the same as one specified in the 264 * socket and if the destination multicast address matches 265 * one of the multicast groups specified in the socket. 266 */ 267 268 /* 269 * KAME note: traditionally we dropped udpiphdr from mbuf 270 * here. We need udphdr for IPsec processing so we do that 271 * later. 272 */ 273 ctx.ip6 = mtod(m, struct ip6_hdr *); 274 ctx.uh = (struct udphdr *)((char *)ctx.ip6 + off); 275 while ((inp = inp_next(&inpi)) != NULL) { 276 INP_RLOCK_ASSERT(inp); 277 /* 278 * XXXRW: Because we weren't holding either the inpcb 279 * or the hash lock when we checked for a match 280 * before, we should probably recheck now that the 281 * inpcb lock is (supposed to be) held. 282 */ 283 /* 284 * Handle socket delivery policy for any-source 285 * and source-specific multicast. [RFC3678] 286 */ 287 if ((imo = inp->in6p_moptions) != NULL) { 288 struct sockaddr_in6 mcaddr; 289 int blocked; 290 291 bzero(&mcaddr, sizeof(struct sockaddr_in6)); 292 mcaddr.sin6_len = sizeof(struct sockaddr_in6); 293 mcaddr.sin6_family = AF_INET6; 294 mcaddr.sin6_addr = ctx.ip6->ip6_dst; 295 296 blocked = im6o_mc_filter(imo, m->m_pkthdr.rcvif, 297 (struct sockaddr *)&mcaddr, 298 (struct sockaddr *)&fromsa[0]); 299 if (blocked != MCAST_PASS) { 300 if (blocked == MCAST_NOTGMEMBER) 301 IP6STAT_INC(ip6s_notmember); 302 if (blocked == MCAST_NOTSMEMBER || 303 blocked == MCAST_MUTED) 304 UDPSTAT_INC(udps_filtermcast); 305 continue; 306 } 307 } 308 if ((n = m_copym(m, 0, M_COPYALL, M_NOWAIT)) != NULL) { 309 if (proto == IPPROTO_UDPLITE) 310 UDPLITE_PROBE(receive, NULL, inp, ctx.ip6, 311 inp, ctx.uh); 312 else 313 UDP_PROBE(receive, NULL, inp, ctx.ip6, inp, 314 ctx.uh); 315 if (udp6_append(inp, n, off, fromsa)) { 316 INP_RUNLOCK(inp); 317 break; 318 } else 319 appends++; 320 } 321 /* 322 * Don't look for additional matches if this one does 323 * not have either the SO_REUSEPORT or SO_REUSEADDR 324 * socket options set. This heuristic avoids 325 * searching through all pcbs in the common case of a 326 * non-shared port. It assumes that an application 327 * will never clear these options after setting them. 328 */ 329 if ((inp->inp_socket->so_options & 330 (SO_REUSEPORT|SO_REUSEPORT_LB|SO_REUSEADDR)) == 0) { 331 INP_RUNLOCK(inp); 332 break; 333 } 334 } 335 m_freem(m); 336 337 if (appends == 0) { 338 /* 339 * No matching pcb found; discard datagram. (No need 340 * to send an ICMP Port Unreachable for a broadcast 341 * or multicast datgram.) 342 */ 343 UDPSTAT_INC(udps_noport); 344 UDPSTAT_INC(udps_noportmcast); 345 } 346 347 return (IPPROTO_DONE); 348 } 349 350 int 351 udp6_input(struct mbuf **mp, int *offp, int proto) 352 { 353 struct mbuf *m = *mp; 354 struct ip6_hdr *ip6; 355 struct udphdr *uh; 356 struct inpcb *inp; 357 struct inpcbinfo *pcbinfo; 358 struct udpcb *up; 359 int off = *offp; 360 int cscov_partial; 361 int plen, ulen; 362 struct sockaddr_in6 fromsa[2]; 363 struct m_tag *fwd_tag; 364 uint16_t uh_sum; 365 uint8_t nxt; 366 367 NET_EPOCH_ASSERT(); 368 369 if (m->m_len < off + sizeof(struct udphdr)) { 370 m = m_pullup(m, off + sizeof(struct udphdr)); 371 if (m == NULL) { 372 IP6STAT_INC(ip6s_exthdrtoolong); 373 *mp = NULL; 374 return (IPPROTO_DONE); 375 } 376 } 377 ip6 = mtod(m, struct ip6_hdr *); 378 uh = (struct udphdr *)((caddr_t)ip6 + off); 379 380 UDPSTAT_INC(udps_ipackets); 381 382 /* 383 * Destination port of 0 is illegal, based on RFC768. 384 */ 385 if (uh->uh_dport == 0) 386 goto badunlocked; 387 388 plen = ntohs(ip6->ip6_plen) - off + sizeof(*ip6); 389 ulen = ntohs((u_short)uh->uh_ulen); 390 391 nxt = proto; 392 cscov_partial = (nxt == IPPROTO_UDPLITE) ? 1 : 0; 393 if (nxt == IPPROTO_UDPLITE) { 394 /* Zero means checksum over the complete packet. */ 395 if (ulen == 0) 396 ulen = plen; 397 if (ulen == plen) 398 cscov_partial = 0; 399 if ((ulen < sizeof(struct udphdr)) || (ulen > plen)) { 400 /* XXX: What is the right UDPLite MIB counter? */ 401 goto badunlocked; 402 } 403 if (uh->uh_sum == 0) { 404 /* XXX: What is the right UDPLite MIB counter? */ 405 goto badunlocked; 406 } 407 } else { 408 if ((ulen < sizeof(struct udphdr)) || (plen != ulen)) { 409 UDPSTAT_INC(udps_badlen); 410 goto badunlocked; 411 } 412 if (uh->uh_sum == 0) { 413 UDPSTAT_INC(udps_nosum); 414 /* 415 * dport 0 was rejected earlier so this is OK even if 416 * zero_checksum_port is 0 (which is its default value). 417 */ 418 if (ntohs(uh->uh_dport) == V_zero_checksum_port) 419 goto skip_checksum; 420 else 421 goto badunlocked; 422 } 423 } 424 425 if ((m->m_pkthdr.csum_flags & CSUM_DATA_VALID_IPV6) && 426 !cscov_partial) { 427 if (m->m_pkthdr.csum_flags & CSUM_PSEUDO_HDR) 428 uh_sum = m->m_pkthdr.csum_data; 429 else 430 uh_sum = in6_cksum_pseudo(ip6, ulen, nxt, 431 m->m_pkthdr.csum_data); 432 uh_sum ^= 0xffff; 433 } else 434 uh_sum = in6_cksum_partial(m, nxt, off, plen, ulen); 435 436 if (uh_sum != 0) { 437 UDPSTAT_INC(udps_badsum); 438 goto badunlocked; 439 } 440 441 skip_checksum: 442 /* 443 * Construct sockaddr format source address. 444 */ 445 init_sin6(&fromsa[0], m, 0); 446 fromsa[0].sin6_port = uh->uh_sport; 447 init_sin6(&fromsa[1], m, 1); 448 fromsa[1].sin6_port = uh->uh_dport; 449 450 pcbinfo = udp_get_inpcbinfo(nxt); 451 if (IN6_IS_ADDR_MULTICAST(&ip6->ip6_dst)) { 452 *mp = NULL; 453 return (udp6_multi_input(m, off, proto, fromsa)); 454 } 455 456 /* 457 * Locate pcb for datagram. 458 */ 459 460 /* 461 * Grab info from PACKET_TAG_IPFORWARD tag prepended to the chain. 462 */ 463 if ((m->m_flags & M_IP6_NEXTHOP) && 464 (fwd_tag = m_tag_find(m, PACKET_TAG_IPFORWARD, NULL)) != NULL) { 465 struct sockaddr_in6 *next_hop6; 466 467 next_hop6 = (struct sockaddr_in6 *)(fwd_tag + 1); 468 469 /* 470 * Transparently forwarded. Pretend to be the destination. 471 * Already got one like this? 472 */ 473 inp = in6_pcblookup_mbuf(pcbinfo, &ip6->ip6_src, 474 uh->uh_sport, &ip6->ip6_dst, uh->uh_dport, 475 INPLOOKUP_RLOCKPCB, m->m_pkthdr.rcvif, m); 476 if (!inp) { 477 /* 478 * It's new. Try to find the ambushing socket. 479 * Because we've rewritten the destination address, 480 * any hardware-generated hash is ignored. 481 */ 482 inp = in6_pcblookup(pcbinfo, &ip6->ip6_src, 483 uh->uh_sport, &next_hop6->sin6_addr, 484 next_hop6->sin6_port ? htons(next_hop6->sin6_port) : 485 uh->uh_dport, INPLOOKUP_WILDCARD | 486 INPLOOKUP_RLOCKPCB, m->m_pkthdr.rcvif); 487 } 488 /* Remove the tag from the packet. We don't need it anymore. */ 489 m_tag_delete(m, fwd_tag); 490 m->m_flags &= ~M_IP6_NEXTHOP; 491 } else 492 inp = in6_pcblookup_mbuf(pcbinfo, &ip6->ip6_src, 493 uh->uh_sport, &ip6->ip6_dst, uh->uh_dport, 494 INPLOOKUP_WILDCARD | INPLOOKUP_RLOCKPCB, 495 m->m_pkthdr.rcvif, m); 496 if (inp == NULL) { 497 if (V_udp_log_in_vain) { 498 char ip6bufs[INET6_ADDRSTRLEN]; 499 char ip6bufd[INET6_ADDRSTRLEN]; 500 501 log(LOG_INFO, 502 "Connection attempt to UDP [%s]:%d from [%s]:%d\n", 503 ip6_sprintf(ip6bufd, &ip6->ip6_dst), 504 ntohs(uh->uh_dport), 505 ip6_sprintf(ip6bufs, &ip6->ip6_src), 506 ntohs(uh->uh_sport)); 507 } 508 if (nxt == IPPROTO_UDPLITE) 509 UDPLITE_PROBE(receive, NULL, NULL, ip6, NULL, uh); 510 else 511 UDP_PROBE(receive, NULL, NULL, ip6, NULL, uh); 512 UDPSTAT_INC(udps_noport); 513 if (m->m_flags & M_MCAST) { 514 printf("UDP6: M_MCAST is set in a unicast packet.\n"); 515 UDPSTAT_INC(udps_noportmcast); 516 goto badunlocked; 517 } 518 if (V_udp_blackhole && (V_udp_blackhole_local || 519 !in6_localaddr(&ip6->ip6_src))) 520 goto badunlocked; 521 icmp6_error(m, ICMP6_DST_UNREACH, ICMP6_DST_UNREACH_NOPORT, 0); 522 *mp = NULL; 523 return (IPPROTO_DONE); 524 } 525 INP_RLOCK_ASSERT(inp); 526 up = intoudpcb(inp); 527 if (cscov_partial) { 528 if (up->u_rxcslen == 0 || up->u_rxcslen > ulen) { 529 INP_RUNLOCK(inp); 530 m_freem(m); 531 *mp = NULL; 532 return (IPPROTO_DONE); 533 } 534 } 535 if (nxt == IPPROTO_UDPLITE) 536 UDPLITE_PROBE(receive, NULL, inp, ip6, inp, uh); 537 else 538 UDP_PROBE(receive, NULL, inp, ip6, inp, uh); 539 if (udp6_append(inp, m, off, fromsa) == 0) 540 INP_RUNLOCK(inp); 541 *mp = NULL; 542 return (IPPROTO_DONE); 543 544 badunlocked: 545 m_freem(m); 546 *mp = NULL; 547 return (IPPROTO_DONE); 548 } 549 550 static void 551 udp6_common_ctlinput(int cmd, struct sockaddr *sa, void *d, 552 struct inpcbinfo *pcbinfo) 553 { 554 struct udphdr uh; 555 struct ip6_hdr *ip6; 556 struct mbuf *m; 557 int off = 0; 558 struct ip6ctlparam *ip6cp = NULL; 559 const struct sockaddr_in6 *sa6_src = NULL; 560 void *cmdarg; 561 struct inpcb *(*notify)(struct inpcb *, int) = udp_notify; 562 struct udp_portonly { 563 u_int16_t uh_sport; 564 u_int16_t uh_dport; 565 } *uhp; 566 567 if (sa->sa_family != AF_INET6 || 568 sa->sa_len != sizeof(struct sockaddr_in6)) 569 return; 570 571 if ((unsigned)cmd >= PRC_NCMDS) 572 return; 573 if (PRC_IS_REDIRECT(cmd)) 574 notify = in6_rtchange, d = NULL; 575 else if (cmd == PRC_HOSTDEAD) 576 d = NULL; 577 else if (inet6ctlerrmap[cmd] == 0) 578 return; 579 580 /* if the parameter is from icmp6, decode it. */ 581 if (d != NULL) { 582 ip6cp = (struct ip6ctlparam *)d; 583 m = ip6cp->ip6c_m; 584 ip6 = ip6cp->ip6c_ip6; 585 off = ip6cp->ip6c_off; 586 cmdarg = ip6cp->ip6c_cmdarg; 587 sa6_src = ip6cp->ip6c_src; 588 } else { 589 m = NULL; 590 ip6 = NULL; 591 cmdarg = NULL; 592 sa6_src = &sa6_any; 593 } 594 595 if (ip6) { 596 /* 597 * XXX: We assume that when IPV6 is non NULL, 598 * M and OFF are valid. 599 */ 600 601 /* Check if we can safely examine src and dst ports. */ 602 if (m->m_pkthdr.len < off + sizeof(*uhp)) 603 return; 604 605 bzero(&uh, sizeof(uh)); 606 m_copydata(m, off, sizeof(*uhp), (caddr_t)&uh); 607 608 if (!PRC_IS_REDIRECT(cmd)) { 609 /* Check to see if its tunneled */ 610 struct inpcb *inp; 611 inp = in6_pcblookup_mbuf(pcbinfo, &ip6->ip6_dst, 612 uh.uh_dport, &ip6->ip6_src, uh.uh_sport, 613 INPLOOKUP_WILDCARD | INPLOOKUP_RLOCKPCB, 614 m->m_pkthdr.rcvif, m); 615 if (inp != NULL) { 616 struct udpcb *up; 617 618 up = intoudpcb(inp); 619 if (up->u_icmp_func) { 620 /* Yes it is. */ 621 INP_RUNLOCK(inp); 622 (*up->u_icmp_func)(cmd, (struct sockaddr *)ip6cp->ip6c_src, 623 d, up->u_tun_ctx); 624 return; 625 } else { 626 /* Can't find it. */ 627 INP_RUNLOCK(inp); 628 } 629 } 630 } 631 (void)in6_pcbnotify(pcbinfo, sa, uh.uh_dport, 632 (struct sockaddr *)ip6cp->ip6c_src, uh.uh_sport, cmd, 633 cmdarg, notify); 634 } else 635 (void)in6_pcbnotify(pcbinfo, sa, 0, 636 (const struct sockaddr *)sa6_src, 0, cmd, cmdarg, notify); 637 } 638 639 void 640 udp6_ctlinput(int cmd, struct sockaddr *sa, void *d) 641 { 642 643 return (udp6_common_ctlinput(cmd, sa, d, &V_udbinfo)); 644 } 645 646 void 647 udplite6_ctlinput(int cmd, struct sockaddr *sa, void *d) 648 { 649 650 return (udp6_common_ctlinput(cmd, sa, d, &V_ulitecbinfo)); 651 } 652 653 static int 654 udp6_getcred(SYSCTL_HANDLER_ARGS) 655 { 656 struct xucred xuc; 657 struct sockaddr_in6 addrs[2]; 658 struct epoch_tracker et; 659 struct inpcb *inp; 660 int error; 661 662 error = priv_check(req->td, PRIV_NETINET_GETCRED); 663 if (error) 664 return (error); 665 666 if (req->newlen != sizeof(addrs)) 667 return (EINVAL); 668 if (req->oldlen != sizeof(struct xucred)) 669 return (EINVAL); 670 error = SYSCTL_IN(req, addrs, sizeof(addrs)); 671 if (error) 672 return (error); 673 if ((error = sa6_embedscope(&addrs[0], V_ip6_use_defzone)) != 0 || 674 (error = sa6_embedscope(&addrs[1], V_ip6_use_defzone)) != 0) { 675 return (error); 676 } 677 NET_EPOCH_ENTER(et); 678 inp = in6_pcblookup(&V_udbinfo, &addrs[1].sin6_addr, 679 addrs[1].sin6_port, &addrs[0].sin6_addr, addrs[0].sin6_port, 680 INPLOOKUP_WILDCARD | INPLOOKUP_RLOCKPCB, NULL); 681 NET_EPOCH_EXIT(et); 682 if (inp != NULL) { 683 INP_RLOCK_ASSERT(inp); 684 if (inp->inp_socket == NULL) 685 error = ENOENT; 686 if (error == 0) 687 error = cr_canseesocket(req->td->td_ucred, 688 inp->inp_socket); 689 if (error == 0) 690 cru2x(inp->inp_cred, &xuc); 691 INP_RUNLOCK(inp); 692 } else 693 error = ENOENT; 694 if (error == 0) 695 error = SYSCTL_OUT(req, &xuc, sizeof(struct xucred)); 696 return (error); 697 } 698 699 SYSCTL_PROC(_net_inet6_udp6, OID_AUTO, getcred, 700 CTLTYPE_OPAQUE | CTLFLAG_RW | CTLFLAG_MPSAFE, 701 0, 0, udp6_getcred, "S,xucred", 702 "Get the xucred of a UDP6 connection"); 703 704 static int 705 udp6_output(struct socket *so, int flags_arg, struct mbuf *m, 706 struct sockaddr *addr6, struct mbuf *control, struct thread *td) 707 { 708 struct inpcb *inp; 709 struct ip6_hdr *ip6; 710 struct udphdr *udp6; 711 struct in6_addr *laddr, *faddr, in6a; 712 struct ip6_pktopts *optp, opt; 713 struct sockaddr_in6 *sin6, tmp; 714 struct epoch_tracker et; 715 int cscov_partial, error, flags, hlen, scope_ambiguous; 716 u_int32_t ulen, plen; 717 uint16_t cscov; 718 u_short fport; 719 uint8_t nxt; 720 721 /* addr6 has been validated in udp6_send(). */ 722 sin6 = (struct sockaddr_in6 *)addr6; 723 724 /* 725 * In contrast to IPv4 we do not validate the max. packet length 726 * here due to IPv6 Jumbograms (RFC2675). 727 */ 728 729 scope_ambiguous = 0; 730 if (sin6) { 731 /* Protect *addr6 from overwrites. */ 732 tmp = *sin6; 733 sin6 = &tmp; 734 735 /* 736 * Application should provide a proper zone ID or the use of 737 * default zone IDs should be enabled. Unfortunately, some 738 * applications do not behave as it should, so we need a 739 * workaround. Even if an appropriate ID is not determined, 740 * we'll see if we can determine the outgoing interface. If we 741 * can, determine the zone ID based on the interface below. 742 */ 743 if (sin6->sin6_scope_id == 0 && !V_ip6_use_defzone) 744 scope_ambiguous = 1; 745 if ((error = sa6_embedscope(sin6, V_ip6_use_defzone)) != 0) { 746 if (control) 747 m_freem(control); 748 m_freem(m); 749 return (error); 750 } 751 } 752 753 inp = sotoinpcb(so); 754 KASSERT(inp != NULL, ("%s: inp == NULL", __func__)); 755 /* 756 * In the following cases we want a write lock on the inp for either 757 * local operations or for possible route cache updates in the IPv6 758 * output path: 759 * - on connected sockets (sin6 is NULL) for route cache updates, 760 * - when we are not bound to an address and source port (it is 761 * in6_pcbsetport() which will require the write lock). 762 * 763 * We check the inp fields before actually locking the inp, so 764 * here exists a race, and we may WLOCK the inp and end with already 765 * bound one by other thread. This is fine. 766 */ 767 if (sin6 == NULL || (IN6_IS_ADDR_UNSPECIFIED(&inp->in6p_laddr) && 768 inp->inp_lport == 0)) 769 INP_WLOCK(inp); 770 else 771 INP_RLOCK(inp); 772 773 nxt = (inp->inp_socket->so_proto->pr_protocol == IPPROTO_UDP) ? 774 IPPROTO_UDP : IPPROTO_UDPLITE; 775 776 #ifdef INET 777 if ((inp->inp_flags & IN6P_IPV6_V6ONLY) == 0) { 778 int hasv4addr; 779 780 if (sin6 == NULL) 781 hasv4addr = (inp->inp_vflag & INP_IPV4); 782 else 783 hasv4addr = IN6_IS_ADDR_V4MAPPED(&sin6->sin6_addr) 784 ? 1 : 0; 785 if (hasv4addr) { 786 /* 787 * XXXRW: We release UDP-layer locks before calling 788 * udp_send() in order to avoid recursion. However, 789 * this does mean there is a short window where inp's 790 * fields are unstable. Could this lead to a 791 * potential race in which the factors causing us to 792 * select the UDPv4 output routine are invalidated? 793 */ 794 INP_UNLOCK(inp); 795 if (sin6) 796 in6_sin6_2_sin_in_sock((struct sockaddr *)sin6); 797 /* addr will just be freed in sendit(). */ 798 return (udp_send(so, flags_arg | PRUS_IPV6, m, 799 (struct sockaddr *)sin6, control, td)); 800 } 801 } else 802 #endif 803 if (sin6 && IN6_IS_ADDR_V4MAPPED(&sin6->sin6_addr)) { 804 /* 805 * Given this is either an IPv6-only socket or no INET is 806 * supported we will fail the send if the given destination 807 * address is a v4mapped address. 808 * 809 * XXXGL: do we leak m and control? 810 */ 811 INP_UNLOCK(inp); 812 return (EINVAL); 813 } 814 815 NET_EPOCH_ENTER(et); 816 if (control) { 817 if ((error = ip6_setpktopts(control, &opt, 818 inp->in6p_outputopts, td->td_ucred, nxt)) != 0) { 819 goto release; 820 } 821 optp = &opt; 822 } else 823 optp = inp->in6p_outputopts; 824 825 if (sin6) { 826 /* 827 * Since we saw no essential reason for calling in_pcbconnect, 828 * we get rid of such kind of logic, and call in6_selectsrc 829 * and in6_pcbsetport in order to fill in the local address 830 * and the local port. 831 */ 832 if (sin6->sin6_port == 0) { 833 error = EADDRNOTAVAIL; 834 goto release; 835 } 836 837 if (!IN6_IS_ADDR_UNSPECIFIED(&inp->in6p_faddr)) { 838 /* how about ::ffff:0.0.0.0 case? */ 839 error = EISCONN; 840 goto release; 841 } 842 843 /* 844 * Given we handle the v4mapped case in the INET block above 845 * assert here that it must not happen anymore. 846 */ 847 KASSERT(!IN6_IS_ADDR_V4MAPPED(&sin6->sin6_addr), 848 ("%s: sin6(%p)->sin6_addr is v4mapped which we " 849 "should have handled.", __func__, sin6)); 850 851 /* This only requires read-locking. */ 852 error = in6_selectsrc_socket(sin6, optp, inp, 853 td->td_ucred, scope_ambiguous, &in6a, NULL); 854 if (error) 855 goto release; 856 laddr = &in6a; 857 858 if (inp->inp_lport == 0) { 859 struct inpcbinfo *pcbinfo; 860 861 INP_WLOCK_ASSERT(inp); 862 863 pcbinfo = udp_get_inpcbinfo(so->so_proto->pr_protocol); 864 INP_HASH_WLOCK(pcbinfo); 865 error = in6_pcbsetport(laddr, inp, td->td_ucred); 866 INP_HASH_WUNLOCK(pcbinfo); 867 if (error != 0) { 868 /* Undo an address bind that may have occurred. */ 869 inp->in6p_laddr = in6addr_any; 870 goto release; 871 } 872 } 873 faddr = &sin6->sin6_addr; 874 fport = sin6->sin6_port; /* allow 0 port */ 875 876 } else { 877 if (IN6_IS_ADDR_UNSPECIFIED(&inp->in6p_faddr)) { 878 error = ENOTCONN; 879 goto release; 880 } 881 laddr = &inp->in6p_laddr; 882 faddr = &inp->in6p_faddr; 883 fport = inp->inp_fport; 884 } 885 886 ulen = m->m_pkthdr.len; 887 plen = sizeof(struct udphdr) + ulen; 888 hlen = sizeof(struct ip6_hdr); 889 890 /* 891 * Calculate data length and get a mbuf 892 * for UDP and IP6 headers. 893 */ 894 M_PREPEND(m, hlen + sizeof(struct udphdr), M_NOWAIT); 895 if (m == NULL) { 896 error = ENOBUFS; 897 goto release; 898 } 899 900 /* 901 * Stuff checksum and output datagram. 902 */ 903 cscov = cscov_partial = 0; 904 udp6 = (struct udphdr *)(mtod(m, caddr_t) + hlen); 905 udp6->uh_sport = inp->inp_lport; /* lport is always set in the PCB */ 906 udp6->uh_dport = fport; 907 if (nxt == IPPROTO_UDPLITE) { 908 struct udpcb *up; 909 910 up = intoudpcb(inp); 911 cscov = up->u_txcslen; 912 if (cscov >= plen) 913 cscov = 0; 914 udp6->uh_ulen = htons(cscov); 915 /* 916 * For UDP-Lite, checksum coverage length of zero means 917 * the entire UDPLite packet is covered by the checksum. 918 */ 919 cscov_partial = (cscov == 0) ? 0 : 1; 920 } else if (plen <= 0xffff) 921 udp6->uh_ulen = htons((u_short)plen); 922 else 923 udp6->uh_ulen = 0; 924 udp6->uh_sum = 0; 925 926 ip6 = mtod(m, struct ip6_hdr *); 927 ip6->ip6_flow = inp->inp_flow & IPV6_FLOWINFO_MASK; 928 ip6->ip6_vfc &= ~IPV6_VERSION_MASK; 929 ip6->ip6_vfc |= IPV6_VERSION; 930 ip6->ip6_plen = htons((u_short)plen); 931 ip6->ip6_nxt = nxt; 932 ip6->ip6_hlim = in6_selecthlim(inp, NULL); 933 ip6->ip6_src = *laddr; 934 ip6->ip6_dst = *faddr; 935 936 #ifdef MAC 937 mac_inpcb_create_mbuf(inp, m); 938 #endif 939 940 if (cscov_partial) { 941 if ((udp6->uh_sum = in6_cksum_partial(m, nxt, 942 sizeof(struct ip6_hdr), plen, cscov)) == 0) 943 udp6->uh_sum = 0xffff; 944 } else { 945 udp6->uh_sum = in6_cksum_pseudo(ip6, plen, nxt, 0); 946 m->m_pkthdr.csum_flags = CSUM_UDP_IPV6; 947 m->m_pkthdr.csum_data = offsetof(struct udphdr, uh_sum); 948 } 949 950 flags = 0; 951 #if defined(ROUTE_MPATH) || defined(RSS) 952 if (CALC_FLOWID_OUTBOUND_SENDTO) { 953 uint32_t hash_type, hash_val; 954 uint8_t pr; 955 956 pr = inp->inp_socket->so_proto->pr_protocol; 957 958 hash_val = fib6_calc_packet_hash(laddr, faddr, 959 inp->inp_lport, fport, pr, &hash_type); 960 m->m_pkthdr.flowid = hash_val; 961 M_HASHTYPE_SET(m, hash_type); 962 } 963 /* do not use inp flowid */ 964 flags |= IP_NODEFAULTFLOWID; 965 #endif 966 967 UDPSTAT_INC(udps_opackets); 968 if (nxt == IPPROTO_UDPLITE) 969 UDPLITE_PROBE(send, NULL, inp, ip6, inp, udp6); 970 else 971 UDP_PROBE(send, NULL, inp, ip6, inp, udp6); 972 error = ip6_output(m, optp, 973 INP_WLOCKED(inp) ? &inp->inp_route6 : NULL, flags, 974 inp->in6p_moptions, NULL, inp); 975 INP_UNLOCK(inp); 976 NET_EPOCH_EXIT(et); 977 978 if (control) { 979 ip6_clearpktopts(&opt, -1); 980 m_freem(control); 981 } 982 return (error); 983 984 release: 985 INP_UNLOCK(inp); 986 NET_EPOCH_EXIT(et); 987 if (control) { 988 ip6_clearpktopts(&opt, -1); 989 m_freem(control); 990 } 991 m_freem(m); 992 993 return (error); 994 } 995 996 static void 997 udp6_abort(struct socket *so) 998 { 999 struct inpcb *inp; 1000 struct inpcbinfo *pcbinfo; 1001 1002 pcbinfo = udp_get_inpcbinfo(so->so_proto->pr_protocol); 1003 inp = sotoinpcb(so); 1004 KASSERT(inp != NULL, ("udp6_abort: inp == NULL")); 1005 1006 INP_WLOCK(inp); 1007 #ifdef INET 1008 if (inp->inp_vflag & INP_IPV4) { 1009 INP_WUNLOCK(inp); 1010 udp_abort(so); 1011 return; 1012 } 1013 #endif 1014 1015 if (!IN6_IS_ADDR_UNSPECIFIED(&inp->in6p_faddr)) { 1016 INP_HASH_WLOCK(pcbinfo); 1017 in6_pcbdisconnect(inp); 1018 inp->in6p_laddr = in6addr_any; 1019 INP_HASH_WUNLOCK(pcbinfo); 1020 soisdisconnected(so); 1021 } 1022 INP_WUNLOCK(inp); 1023 } 1024 1025 static int 1026 udp6_attach(struct socket *so, int proto, struct thread *td) 1027 { 1028 struct inpcb *inp; 1029 struct inpcbinfo *pcbinfo; 1030 int error; 1031 1032 pcbinfo = udp_get_inpcbinfo(so->so_proto->pr_protocol); 1033 inp = sotoinpcb(so); 1034 KASSERT(inp == NULL, ("udp6_attach: inp != NULL")); 1035 1036 if (so->so_snd.sb_hiwat == 0 || so->so_rcv.sb_hiwat == 0) { 1037 error = soreserve(so, udp_sendspace, udp_recvspace); 1038 if (error) 1039 return (error); 1040 } 1041 error = in_pcballoc(so, pcbinfo); 1042 if (error) 1043 return (error); 1044 inp = (struct inpcb *)so->so_pcb; 1045 inp->in6p_cksum = -1; /* just to be sure */ 1046 /* 1047 * XXX: ugly!! 1048 * IPv4 TTL initialization is necessary for an IPv6 socket as well, 1049 * because the socket may be bound to an IPv6 wildcard address, 1050 * which may match an IPv4-mapped IPv6 address. 1051 */ 1052 inp->inp_ip_ttl = V_ip_defttl; 1053 1054 error = udp_newudpcb(inp); 1055 if (error) { 1056 in_pcbdetach(inp); 1057 in_pcbfree(inp); 1058 return (error); 1059 } 1060 INP_WUNLOCK(inp); 1061 return (0); 1062 } 1063 1064 static int 1065 udp6_bind(struct socket *so, struct sockaddr *nam, struct thread *td) 1066 { 1067 struct inpcb *inp; 1068 struct inpcbinfo *pcbinfo; 1069 int error; 1070 u_char vflagsav; 1071 1072 pcbinfo = udp_get_inpcbinfo(so->so_proto->pr_protocol); 1073 inp = sotoinpcb(so); 1074 KASSERT(inp != NULL, ("udp6_bind: inp == NULL")); 1075 1076 if (nam->sa_family != AF_INET6) 1077 return (EAFNOSUPPORT); 1078 if (nam->sa_len != sizeof(struct sockaddr_in6)) 1079 return (EINVAL); 1080 1081 INP_WLOCK(inp); 1082 INP_HASH_WLOCK(pcbinfo); 1083 vflagsav = inp->inp_vflag; 1084 inp->inp_vflag &= ~INP_IPV4; 1085 inp->inp_vflag |= INP_IPV6; 1086 if ((inp->inp_flags & IN6P_IPV6_V6ONLY) == 0) { 1087 struct sockaddr_in6 *sin6_p; 1088 1089 sin6_p = (struct sockaddr_in6 *)nam; 1090 1091 if (IN6_IS_ADDR_UNSPECIFIED(&sin6_p->sin6_addr)) 1092 inp->inp_vflag |= INP_IPV4; 1093 #ifdef INET 1094 else if (IN6_IS_ADDR_V4MAPPED(&sin6_p->sin6_addr)) { 1095 struct sockaddr_in sin; 1096 1097 in6_sin6_2_sin(&sin, sin6_p); 1098 inp->inp_vflag |= INP_IPV4; 1099 inp->inp_vflag &= ~INP_IPV6; 1100 error = in_pcbbind(inp, (struct sockaddr *)&sin, 1101 td->td_ucred); 1102 goto out; 1103 } 1104 #endif 1105 } 1106 1107 error = in6_pcbbind(inp, nam, td->td_ucred); 1108 #ifdef INET 1109 out: 1110 #endif 1111 if (error != 0) 1112 inp->inp_vflag = vflagsav; 1113 INP_HASH_WUNLOCK(pcbinfo); 1114 INP_WUNLOCK(inp); 1115 return (error); 1116 } 1117 1118 static void 1119 udp6_close(struct socket *so) 1120 { 1121 struct inpcb *inp; 1122 struct inpcbinfo *pcbinfo; 1123 1124 pcbinfo = udp_get_inpcbinfo(so->so_proto->pr_protocol); 1125 inp = sotoinpcb(so); 1126 KASSERT(inp != NULL, ("udp6_close: inp == NULL")); 1127 1128 INP_WLOCK(inp); 1129 #ifdef INET 1130 if (inp->inp_vflag & INP_IPV4) { 1131 INP_WUNLOCK(inp); 1132 (void)udp_disconnect(so); 1133 return; 1134 } 1135 #endif 1136 if (!IN6_IS_ADDR_UNSPECIFIED(&inp->in6p_faddr)) { 1137 INP_HASH_WLOCK(pcbinfo); 1138 in6_pcbdisconnect(inp); 1139 inp->in6p_laddr = in6addr_any; 1140 INP_HASH_WUNLOCK(pcbinfo); 1141 soisdisconnected(so); 1142 } 1143 INP_WUNLOCK(inp); 1144 } 1145 1146 static int 1147 udp6_connect(struct socket *so, struct sockaddr *nam, struct thread *td) 1148 { 1149 #ifdef INET 1150 struct epoch_tracker et; 1151 #endif 1152 struct inpcb *inp; 1153 struct inpcbinfo *pcbinfo; 1154 struct sockaddr_in6 *sin6; 1155 int error; 1156 u_char vflagsav; 1157 1158 pcbinfo = udp_get_inpcbinfo(so->so_proto->pr_protocol); 1159 inp = sotoinpcb(so); 1160 KASSERT(inp != NULL, ("udp6_connect: inp == NULL")); 1161 1162 sin6 = (struct sockaddr_in6 *)nam; 1163 if (sin6->sin6_family != AF_INET6) 1164 return (EAFNOSUPPORT); 1165 if (sin6->sin6_len != sizeof(*sin6)) 1166 return (EINVAL); 1167 1168 /* 1169 * XXXRW: Need to clarify locking of v4/v6 flags. 1170 */ 1171 INP_WLOCK(inp); 1172 #ifdef INET 1173 if (IN6_IS_ADDR_V4MAPPED(&sin6->sin6_addr)) { 1174 struct sockaddr_in sin; 1175 1176 if ((inp->inp_flags & IN6P_IPV6_V6ONLY) != 0) { 1177 error = EINVAL; 1178 goto out; 1179 } 1180 if ((inp->inp_vflag & INP_IPV4) == 0) { 1181 error = EAFNOSUPPORT; 1182 goto out; 1183 } 1184 if (inp->inp_faddr.s_addr != INADDR_ANY) { 1185 error = EISCONN; 1186 goto out; 1187 } 1188 in6_sin6_2_sin(&sin, sin6); 1189 error = prison_remote_ip4(td->td_ucred, &sin.sin_addr); 1190 if (error != 0) 1191 goto out; 1192 vflagsav = inp->inp_vflag; 1193 inp->inp_vflag |= INP_IPV4; 1194 inp->inp_vflag &= ~INP_IPV6; 1195 NET_EPOCH_ENTER(et); 1196 INP_HASH_WLOCK(pcbinfo); 1197 error = in_pcbconnect(inp, (struct sockaddr *)&sin, 1198 td->td_ucred, true); 1199 INP_HASH_WUNLOCK(pcbinfo); 1200 NET_EPOCH_EXIT(et); 1201 /* 1202 * If connect succeeds, mark socket as connected. If 1203 * connect fails and socket is unbound, reset inp_vflag 1204 * field. 1205 */ 1206 if (error == 0) 1207 soisconnected(so); 1208 else if (inp->inp_laddr.s_addr == INADDR_ANY && 1209 inp->inp_lport == 0) 1210 inp->inp_vflag = vflagsav; 1211 goto out; 1212 } else { 1213 if ((inp->inp_vflag & INP_IPV6) == 0) { 1214 error = EAFNOSUPPORT; 1215 goto out; 1216 } 1217 } 1218 #endif 1219 if (!IN6_IS_ADDR_UNSPECIFIED(&inp->in6p_faddr)) { 1220 error = EISCONN; 1221 goto out; 1222 } 1223 error = prison_remote_ip6(td->td_ucred, &sin6->sin6_addr); 1224 if (error != 0) 1225 goto out; 1226 vflagsav = inp->inp_vflag; 1227 inp->inp_vflag &= ~INP_IPV4; 1228 inp->inp_vflag |= INP_IPV6; 1229 INP_HASH_WLOCK(pcbinfo); 1230 error = in6_pcbconnect(inp, nam, td->td_ucred); 1231 INP_HASH_WUNLOCK(pcbinfo); 1232 /* 1233 * If connect succeeds, mark socket as connected. If 1234 * connect fails and socket is unbound, reset inp_vflag 1235 * field. 1236 */ 1237 if (error == 0) 1238 soisconnected(so); 1239 else if (IN6_IS_ADDR_UNSPECIFIED(&inp->in6p_laddr) && 1240 inp->inp_lport == 0) 1241 inp->inp_vflag = vflagsav; 1242 out: 1243 INP_WUNLOCK(inp); 1244 return (error); 1245 } 1246 1247 static void 1248 udp6_detach(struct socket *so) 1249 { 1250 struct inpcb *inp; 1251 struct udpcb *up; 1252 1253 inp = sotoinpcb(so); 1254 KASSERT(inp != NULL, ("udp6_detach: inp == NULL")); 1255 1256 INP_WLOCK(inp); 1257 up = intoudpcb(inp); 1258 KASSERT(up != NULL, ("%s: up == NULL", __func__)); 1259 in_pcbdetach(inp); 1260 in_pcbfree(inp); 1261 udp_discardcb(up); 1262 } 1263 1264 static int 1265 udp6_disconnect(struct socket *so) 1266 { 1267 struct inpcb *inp; 1268 struct inpcbinfo *pcbinfo; 1269 1270 pcbinfo = udp_get_inpcbinfo(so->so_proto->pr_protocol); 1271 inp = sotoinpcb(so); 1272 KASSERT(inp != NULL, ("udp6_disconnect: inp == NULL")); 1273 1274 INP_WLOCK(inp); 1275 #ifdef INET 1276 if (inp->inp_vflag & INP_IPV4) { 1277 INP_WUNLOCK(inp); 1278 (void)udp_disconnect(so); 1279 return (0); 1280 } 1281 #endif 1282 1283 if (IN6_IS_ADDR_UNSPECIFIED(&inp->in6p_faddr)) { 1284 INP_WUNLOCK(inp); 1285 return (ENOTCONN); 1286 } 1287 1288 INP_HASH_WLOCK(pcbinfo); 1289 in6_pcbdisconnect(inp); 1290 inp->in6p_laddr = in6addr_any; 1291 INP_HASH_WUNLOCK(pcbinfo); 1292 SOCK_LOCK(so); 1293 so->so_state &= ~SS_ISCONNECTED; /* XXX */ 1294 SOCK_UNLOCK(so); 1295 INP_WUNLOCK(inp); 1296 return (0); 1297 } 1298 1299 static int 1300 udp6_send(struct socket *so, int flags, struct mbuf *m, 1301 struct sockaddr *addr, struct mbuf *control, struct thread *td) 1302 { 1303 int error; 1304 1305 if (addr) { 1306 if (addr->sa_len != sizeof(struct sockaddr_in6)) { 1307 error = EINVAL; 1308 goto bad; 1309 } 1310 if (addr->sa_family != AF_INET6) { 1311 error = EAFNOSUPPORT; 1312 goto bad; 1313 } 1314 } 1315 1316 return (udp6_output(so, flags, m, addr, control, td)); 1317 1318 bad: 1319 if (control) 1320 m_freem(control); 1321 m_freem(m); 1322 return (error); 1323 } 1324 1325 #define UDP6_PROTOSW \ 1326 .pr_type = SOCK_DGRAM, \ 1327 .pr_flags = PR_ATOMIC|PR_ADDR|PR_CAPATTACH, \ 1328 .pr_ctloutput = ip6_ctloutput, \ 1329 .pr_abort = udp6_abort, \ 1330 .pr_attach = udp6_attach, \ 1331 .pr_bind = udp6_bind, \ 1332 .pr_connect = udp6_connect, \ 1333 .pr_control = in6_control, \ 1334 .pr_detach = udp6_detach, \ 1335 .pr_disconnect = udp6_disconnect, \ 1336 .pr_peeraddr = in6_mapped_peeraddr, \ 1337 .pr_send = udp6_send, \ 1338 .pr_shutdown = udp_shutdown, \ 1339 .pr_sockaddr = in6_mapped_sockaddr, \ 1340 .pr_soreceive = soreceive_dgram, \ 1341 .pr_sosend = sosend_dgram, \ 1342 .pr_sosetlabel = in_pcbsosetlabel, \ 1343 .pr_close = udp6_close 1344 1345 struct protosw udp6_protosw = { 1346 .pr_protocol = IPPROTO_UDP, 1347 UDP6_PROTOSW 1348 }; 1349 1350 struct protosw udplite6_protosw = { 1351 .pr_protocol = IPPROTO_UDPLITE, 1352 UDP6_PROTOSW 1353 }; 1354 1355 static void 1356 udp6_init(void *arg __unused) 1357 { 1358 1359 IP6PROTO_REGISTER(IPPROTO_UDP, udp6_input, udp6_ctlinput); 1360 IP6PROTO_REGISTER(IPPROTO_UDPLITE, udp6_input, udplite6_ctlinput); 1361 } 1362 SYSINIT(udp6_init, SI_SUB_PROTO_DOMAIN, SI_ORDER_THIRD, udp6_init, NULL); 1363