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 * UDP protocol implementation. 136 * Per RFC 768, August, 1980. 137 */ 138 139 extern struct protosw inetsw[]; 140 static void udp6_detach(struct socket *so); 141 142 static int 143 udp6_append(struct inpcb *inp, struct mbuf *n, int off, 144 struct sockaddr_in6 *fromsa) 145 { 146 struct socket *so; 147 struct mbuf *opts = NULL, *tmp_opts; 148 struct udpcb *up; 149 bool filtered; 150 151 INP_LOCK_ASSERT(inp); 152 153 /* 154 * Engage the tunneling protocol. 155 */ 156 up = intoudpcb(inp); 157 if (up->u_tun_func != NULL) { 158 in_pcbref(inp); 159 INP_RUNLOCK(inp); 160 filtered = (*up->u_tun_func)(n, off, inp, 161 (struct sockaddr *)&fromsa[0], up->u_tun_ctx); 162 INP_RLOCK(inp); 163 if (filtered) 164 return (in_pcbrele_rlocked(inp)); 165 } 166 #if defined(IPSEC) || defined(IPSEC_SUPPORT) 167 /* Check AH/ESP integrity. */ 168 if (IPSEC_ENABLED(ipv6)) { 169 if (IPSEC_CHECK_POLICY(ipv6, n, inp) != 0) { 170 m_freem(n); 171 return (0); 172 } 173 } 174 #endif /* IPSEC */ 175 #ifdef MAC 176 if (mac_inpcb_check_deliver(inp, n) != 0) { 177 m_freem(n); 178 return (0); 179 } 180 #endif 181 opts = NULL; 182 if (inp->inp_flags & INP_CONTROLOPTS || 183 inp->inp_socket->so_options & SO_TIMESTAMP) 184 ip6_savecontrol(inp, n, &opts); 185 if ((inp->inp_vflag & INP_IPV6) && (inp->inp_flags2 & INP_ORIGDSTADDR)) { 186 tmp_opts = sbcreatecontrol((caddr_t)&fromsa[1], 187 sizeof(struct sockaddr_in6), IPV6_ORIGDSTADDR, IPPROTO_IPV6); 188 if (tmp_opts) { 189 if (opts) { 190 tmp_opts->m_next = opts; 191 opts = tmp_opts; 192 } else 193 opts = tmp_opts; 194 } 195 } 196 m_adj(n, off + sizeof(struct udphdr)); 197 198 so = inp->inp_socket; 199 SOCKBUF_LOCK(&so->so_rcv); 200 if (sbappendaddr_locked(&so->so_rcv, (struct sockaddr *)&fromsa[0], n, 201 opts) == 0) { 202 soroverflow_locked(so); 203 m_freem(n); 204 if (opts) 205 m_freem(opts); 206 UDPSTAT_INC(udps_fullsock); 207 } else 208 sorwakeup_locked(so); 209 return (0); 210 } 211 212 struct udp6_multi_match_ctx { 213 struct ip6_hdr *ip6; 214 struct udphdr *uh; 215 }; 216 217 static bool 218 udp6_multi_match(const struct inpcb *inp, void *v) 219 { 220 struct udp6_multi_match_ctx *ctx = v; 221 222 if ((inp->inp_vflag & INP_IPV6) == 0) 223 return(false); 224 if (inp->inp_lport != ctx->uh->uh_dport) 225 return(false); 226 if (inp->inp_fport != 0 && inp->inp_fport != ctx->uh->uh_sport) 227 return(false); 228 if (!IN6_IS_ADDR_UNSPECIFIED(&inp->in6p_laddr) && 229 !IN6_ARE_ADDR_EQUAL(&inp->in6p_laddr, &ctx->ip6->ip6_dst)) 230 return (false); 231 if (!IN6_IS_ADDR_UNSPECIFIED(&inp->in6p_faddr) && 232 (!IN6_ARE_ADDR_EQUAL(&inp->in6p_faddr, &ctx->ip6->ip6_src) || 233 inp->inp_fport != ctx->uh->uh_sport)) 234 return (false); 235 236 return (true); 237 } 238 239 static int 240 udp6_multi_input(struct mbuf *m, int off, int proto, 241 struct sockaddr_in6 *fromsa) 242 { 243 struct udp6_multi_match_ctx ctx; 244 struct inpcb_iterator inpi = INP_ITERATOR(udp_get_inpcbinfo(proto), 245 INPLOOKUP_RLOCKPCB, udp6_multi_match, &ctx); 246 struct inpcb *inp; 247 struct ip6_moptions *imo; 248 struct mbuf *n; 249 int appends = 0; 250 251 /* 252 * In the event that laddr should be set to the link-local 253 * address (this happens in RIPng), the multicast address 254 * specified in the received packet will not match laddr. To 255 * handle this situation, matching is relaxed if the 256 * receiving interface is the same as one specified in the 257 * socket and if the destination multicast address matches 258 * one of the multicast groups specified in the socket. 259 */ 260 261 /* 262 * KAME note: traditionally we dropped udpiphdr from mbuf 263 * here. We need udphdr for IPsec processing so we do that 264 * later. 265 */ 266 ctx.ip6 = mtod(m, struct ip6_hdr *); 267 ctx.uh = (struct udphdr *)((char *)ctx.ip6 + off); 268 while ((inp = inp_next(&inpi)) != NULL) { 269 INP_RLOCK_ASSERT(inp); 270 /* 271 * XXXRW: Because we weren't holding either the inpcb 272 * or the hash lock when we checked for a match 273 * before, we should probably recheck now that the 274 * inpcb lock is (supposed to be) held. 275 */ 276 /* 277 * Handle socket delivery policy for any-source 278 * and source-specific multicast. [RFC3678] 279 */ 280 if ((imo = inp->in6p_moptions) != NULL) { 281 struct sockaddr_in6 mcaddr; 282 int blocked; 283 284 bzero(&mcaddr, sizeof(struct sockaddr_in6)); 285 mcaddr.sin6_len = sizeof(struct sockaddr_in6); 286 mcaddr.sin6_family = AF_INET6; 287 mcaddr.sin6_addr = ctx.ip6->ip6_dst; 288 289 blocked = im6o_mc_filter(imo, m->m_pkthdr.rcvif, 290 (struct sockaddr *)&mcaddr, 291 (struct sockaddr *)&fromsa[0]); 292 if (blocked != MCAST_PASS) { 293 if (blocked == MCAST_NOTGMEMBER) 294 IP6STAT_INC(ip6s_notmember); 295 if (blocked == MCAST_NOTSMEMBER || 296 blocked == MCAST_MUTED) 297 UDPSTAT_INC(udps_filtermcast); 298 continue; 299 } 300 } 301 if ((n = m_copym(m, 0, M_COPYALL, M_NOWAIT)) != NULL) { 302 if (proto == IPPROTO_UDPLITE) 303 UDPLITE_PROBE(receive, NULL, inp, ctx.ip6, 304 inp, ctx.uh); 305 else 306 UDP_PROBE(receive, NULL, inp, ctx.ip6, inp, 307 ctx.uh); 308 if (udp6_append(inp, n, off, fromsa)) { 309 INP_RUNLOCK(inp); 310 break; 311 } else 312 appends++; 313 } 314 /* 315 * Don't look for additional matches if this one does 316 * not have either the SO_REUSEPORT or SO_REUSEADDR 317 * socket options set. This heuristic avoids 318 * searching through all pcbs in the common case of a 319 * non-shared port. It assumes that an application 320 * will never clear these options after setting them. 321 */ 322 if ((inp->inp_socket->so_options & 323 (SO_REUSEPORT|SO_REUSEPORT_LB|SO_REUSEADDR)) == 0) { 324 INP_RUNLOCK(inp); 325 break; 326 } 327 } 328 m_freem(m); 329 330 if (appends == 0) { 331 /* 332 * No matching pcb found; discard datagram. (No need 333 * to send an ICMP Port Unreachable for a broadcast 334 * or multicast datgram.) 335 */ 336 UDPSTAT_INC(udps_noport); 337 UDPSTAT_INC(udps_noportmcast); 338 } 339 340 return (IPPROTO_DONE); 341 } 342 343 int 344 udp6_input(struct mbuf **mp, int *offp, int proto) 345 { 346 struct mbuf *m = *mp; 347 struct ip6_hdr *ip6; 348 struct udphdr *uh; 349 struct inpcb *inp; 350 struct inpcbinfo *pcbinfo; 351 struct udpcb *up; 352 int off = *offp; 353 int cscov_partial; 354 int plen, ulen; 355 struct sockaddr_in6 fromsa[2]; 356 struct m_tag *fwd_tag; 357 uint16_t uh_sum; 358 uint8_t nxt; 359 360 NET_EPOCH_ASSERT(); 361 362 if (m->m_len < off + sizeof(struct udphdr)) { 363 m = m_pullup(m, off + sizeof(struct udphdr)); 364 if (m == NULL) { 365 IP6STAT_INC(ip6s_exthdrtoolong); 366 *mp = NULL; 367 return (IPPROTO_DONE); 368 } 369 } 370 ip6 = mtod(m, struct ip6_hdr *); 371 uh = (struct udphdr *)((caddr_t)ip6 + off); 372 373 UDPSTAT_INC(udps_ipackets); 374 375 /* 376 * Destination port of 0 is illegal, based on RFC768. 377 */ 378 if (uh->uh_dport == 0) 379 goto badunlocked; 380 381 plen = ntohs(ip6->ip6_plen) - off + sizeof(*ip6); 382 ulen = ntohs((u_short)uh->uh_ulen); 383 384 nxt = proto; 385 cscov_partial = (nxt == IPPROTO_UDPLITE) ? 1 : 0; 386 if (nxt == IPPROTO_UDPLITE) { 387 /* Zero means checksum over the complete packet. */ 388 if (ulen == 0) 389 ulen = plen; 390 if (ulen == plen) 391 cscov_partial = 0; 392 if ((ulen < sizeof(struct udphdr)) || (ulen > plen)) { 393 /* XXX: What is the right UDPLite MIB counter? */ 394 goto badunlocked; 395 } 396 if (uh->uh_sum == 0) { 397 /* XXX: What is the right UDPLite MIB counter? */ 398 goto badunlocked; 399 } 400 } else { 401 if ((ulen < sizeof(struct udphdr)) || (plen != ulen)) { 402 UDPSTAT_INC(udps_badlen); 403 goto badunlocked; 404 } 405 if (uh->uh_sum == 0) { 406 UDPSTAT_INC(udps_nosum); 407 /* 408 * dport 0 was rejected earlier so this is OK even if 409 * zero_checksum_port is 0 (which is its default value). 410 */ 411 if (ntohs(uh->uh_dport) == V_zero_checksum_port) 412 goto skip_checksum; 413 else 414 goto badunlocked; 415 } 416 } 417 418 if ((m->m_pkthdr.csum_flags & CSUM_DATA_VALID_IPV6) && 419 !cscov_partial) { 420 if (m->m_pkthdr.csum_flags & CSUM_PSEUDO_HDR) 421 uh_sum = m->m_pkthdr.csum_data; 422 else 423 uh_sum = in6_cksum_pseudo(ip6, ulen, nxt, 424 m->m_pkthdr.csum_data); 425 uh_sum ^= 0xffff; 426 } else 427 uh_sum = in6_cksum_partial(m, nxt, off, plen, ulen); 428 429 if (uh_sum != 0) { 430 UDPSTAT_INC(udps_badsum); 431 goto badunlocked; 432 } 433 434 skip_checksum: 435 /* 436 * Construct sockaddr format source address. 437 */ 438 init_sin6(&fromsa[0], m, 0); 439 fromsa[0].sin6_port = uh->uh_sport; 440 init_sin6(&fromsa[1], m, 1); 441 fromsa[1].sin6_port = uh->uh_dport; 442 443 pcbinfo = udp_get_inpcbinfo(nxt); 444 if (IN6_IS_ADDR_MULTICAST(&ip6->ip6_dst)) { 445 *mp = NULL; 446 return (udp6_multi_input(m, off, proto, fromsa)); 447 } 448 449 /* 450 * Locate pcb for datagram. 451 */ 452 453 /* 454 * Grab info from PACKET_TAG_IPFORWARD tag prepended to the chain. 455 */ 456 if ((m->m_flags & M_IP6_NEXTHOP) && 457 (fwd_tag = m_tag_find(m, PACKET_TAG_IPFORWARD, NULL)) != NULL) { 458 struct sockaddr_in6 *next_hop6; 459 460 next_hop6 = (struct sockaddr_in6 *)(fwd_tag + 1); 461 462 /* 463 * Transparently forwarded. Pretend to be the destination. 464 * Already got one like this? 465 */ 466 inp = in6_pcblookup_mbuf(pcbinfo, &ip6->ip6_src, 467 uh->uh_sport, &ip6->ip6_dst, uh->uh_dport, 468 INPLOOKUP_RLOCKPCB, m->m_pkthdr.rcvif, m); 469 if (!inp) { 470 /* 471 * It's new. Try to find the ambushing socket. 472 * Because we've rewritten the destination address, 473 * any hardware-generated hash is ignored. 474 */ 475 inp = in6_pcblookup(pcbinfo, &ip6->ip6_src, 476 uh->uh_sport, &next_hop6->sin6_addr, 477 next_hop6->sin6_port ? htons(next_hop6->sin6_port) : 478 uh->uh_dport, INPLOOKUP_WILDCARD | 479 INPLOOKUP_RLOCKPCB, m->m_pkthdr.rcvif); 480 } 481 /* Remove the tag from the packet. We don't need it anymore. */ 482 m_tag_delete(m, fwd_tag); 483 m->m_flags &= ~M_IP6_NEXTHOP; 484 } else 485 inp = in6_pcblookup_mbuf(pcbinfo, &ip6->ip6_src, 486 uh->uh_sport, &ip6->ip6_dst, uh->uh_dport, 487 INPLOOKUP_WILDCARD | INPLOOKUP_RLOCKPCB, 488 m->m_pkthdr.rcvif, m); 489 if (inp == NULL) { 490 if (V_udp_log_in_vain) { 491 char ip6bufs[INET6_ADDRSTRLEN]; 492 char ip6bufd[INET6_ADDRSTRLEN]; 493 494 log(LOG_INFO, 495 "Connection attempt to UDP [%s]:%d from [%s]:%d\n", 496 ip6_sprintf(ip6bufd, &ip6->ip6_dst), 497 ntohs(uh->uh_dport), 498 ip6_sprintf(ip6bufs, &ip6->ip6_src), 499 ntohs(uh->uh_sport)); 500 } 501 if (nxt == IPPROTO_UDPLITE) 502 UDPLITE_PROBE(receive, NULL, NULL, ip6, NULL, uh); 503 else 504 UDP_PROBE(receive, NULL, NULL, ip6, NULL, uh); 505 UDPSTAT_INC(udps_noport); 506 if (m->m_flags & M_MCAST) { 507 printf("UDP6: M_MCAST is set in a unicast packet.\n"); 508 UDPSTAT_INC(udps_noportmcast); 509 goto badunlocked; 510 } 511 if (V_udp_blackhole && (V_udp_blackhole_local || 512 !in6_localaddr(&ip6->ip6_src))) 513 goto badunlocked; 514 icmp6_error(m, ICMP6_DST_UNREACH, ICMP6_DST_UNREACH_NOPORT, 0); 515 *mp = NULL; 516 return (IPPROTO_DONE); 517 } 518 INP_RLOCK_ASSERT(inp); 519 up = intoudpcb(inp); 520 if (cscov_partial) { 521 if (up->u_rxcslen == 0 || up->u_rxcslen > ulen) { 522 INP_RUNLOCK(inp); 523 m_freem(m); 524 *mp = NULL; 525 return (IPPROTO_DONE); 526 } 527 } 528 if (nxt == IPPROTO_UDPLITE) 529 UDPLITE_PROBE(receive, NULL, inp, ip6, inp, uh); 530 else 531 UDP_PROBE(receive, NULL, inp, ip6, inp, uh); 532 if (udp6_append(inp, m, off, fromsa) == 0) 533 INP_RUNLOCK(inp); 534 *mp = NULL; 535 return (IPPROTO_DONE); 536 537 badunlocked: 538 m_freem(m); 539 *mp = NULL; 540 return (IPPROTO_DONE); 541 } 542 543 static void 544 udp6_common_ctlinput(int cmd, struct sockaddr *sa, void *d, 545 struct inpcbinfo *pcbinfo) 546 { 547 struct udphdr uh; 548 struct ip6_hdr *ip6; 549 struct mbuf *m; 550 int off = 0; 551 struct ip6ctlparam *ip6cp = NULL; 552 const struct sockaddr_in6 *sa6_src = NULL; 553 void *cmdarg; 554 struct inpcb *(*notify)(struct inpcb *, int) = udp_notify; 555 struct udp_portonly { 556 u_int16_t uh_sport; 557 u_int16_t uh_dport; 558 } *uhp; 559 560 if (sa->sa_family != AF_INET6 || 561 sa->sa_len != sizeof(struct sockaddr_in6)) 562 return; 563 564 if ((unsigned)cmd >= PRC_NCMDS) 565 return; 566 if (PRC_IS_REDIRECT(cmd)) 567 notify = in6_rtchange, d = NULL; 568 else if (cmd == PRC_HOSTDEAD) 569 d = NULL; 570 else if (inet6ctlerrmap[cmd] == 0) 571 return; 572 573 /* if the parameter is from icmp6, decode it. */ 574 if (d != NULL) { 575 ip6cp = (struct ip6ctlparam *)d; 576 m = ip6cp->ip6c_m; 577 ip6 = ip6cp->ip6c_ip6; 578 off = ip6cp->ip6c_off; 579 cmdarg = ip6cp->ip6c_cmdarg; 580 sa6_src = ip6cp->ip6c_src; 581 } else { 582 m = NULL; 583 ip6 = NULL; 584 cmdarg = NULL; 585 sa6_src = &sa6_any; 586 } 587 588 if (ip6) { 589 /* 590 * XXX: We assume that when IPV6 is non NULL, 591 * M and OFF are valid. 592 */ 593 594 /* Check if we can safely examine src and dst ports. */ 595 if (m->m_pkthdr.len < off + sizeof(*uhp)) 596 return; 597 598 bzero(&uh, sizeof(uh)); 599 m_copydata(m, off, sizeof(*uhp), (caddr_t)&uh); 600 601 if (!PRC_IS_REDIRECT(cmd)) { 602 /* Check to see if its tunneled */ 603 struct inpcb *inp; 604 inp = in6_pcblookup_mbuf(pcbinfo, &ip6->ip6_dst, 605 uh.uh_dport, &ip6->ip6_src, uh.uh_sport, 606 INPLOOKUP_WILDCARD | INPLOOKUP_RLOCKPCB, 607 m->m_pkthdr.rcvif, m); 608 if (inp != NULL) { 609 struct udpcb *up; 610 611 up = intoudpcb(inp); 612 if (up->u_icmp_func) { 613 /* Yes it is. */ 614 INP_RUNLOCK(inp); 615 (*up->u_icmp_func)(cmd, (struct sockaddr *)ip6cp->ip6c_src, 616 d, up->u_tun_ctx); 617 return; 618 } else { 619 /* Can't find it. */ 620 INP_RUNLOCK(inp); 621 } 622 } 623 } 624 (void)in6_pcbnotify(pcbinfo, sa, uh.uh_dport, 625 (struct sockaddr *)ip6cp->ip6c_src, uh.uh_sport, cmd, 626 cmdarg, notify); 627 } else 628 (void)in6_pcbnotify(pcbinfo, sa, 0, 629 (const struct sockaddr *)sa6_src, 0, cmd, cmdarg, notify); 630 } 631 632 void 633 udp6_ctlinput(int cmd, struct sockaddr *sa, void *d) 634 { 635 636 return (udp6_common_ctlinput(cmd, sa, d, &V_udbinfo)); 637 } 638 639 void 640 udplite6_ctlinput(int cmd, struct sockaddr *sa, void *d) 641 { 642 643 return (udp6_common_ctlinput(cmd, sa, d, &V_ulitecbinfo)); 644 } 645 646 static int 647 udp6_getcred(SYSCTL_HANDLER_ARGS) 648 { 649 struct xucred xuc; 650 struct sockaddr_in6 addrs[2]; 651 struct epoch_tracker et; 652 struct inpcb *inp; 653 int error; 654 655 error = priv_check(req->td, PRIV_NETINET_GETCRED); 656 if (error) 657 return (error); 658 659 if (req->newlen != sizeof(addrs)) 660 return (EINVAL); 661 if (req->oldlen != sizeof(struct xucred)) 662 return (EINVAL); 663 error = SYSCTL_IN(req, addrs, sizeof(addrs)); 664 if (error) 665 return (error); 666 if ((error = sa6_embedscope(&addrs[0], V_ip6_use_defzone)) != 0 || 667 (error = sa6_embedscope(&addrs[1], V_ip6_use_defzone)) != 0) { 668 return (error); 669 } 670 NET_EPOCH_ENTER(et); 671 inp = in6_pcblookup(&V_udbinfo, &addrs[1].sin6_addr, 672 addrs[1].sin6_port, &addrs[0].sin6_addr, addrs[0].sin6_port, 673 INPLOOKUP_WILDCARD | INPLOOKUP_RLOCKPCB, NULL); 674 NET_EPOCH_EXIT(et); 675 if (inp != NULL) { 676 INP_RLOCK_ASSERT(inp); 677 if (inp->inp_socket == NULL) 678 error = ENOENT; 679 if (error == 0) 680 error = cr_canseesocket(req->td->td_ucred, 681 inp->inp_socket); 682 if (error == 0) 683 cru2x(inp->inp_cred, &xuc); 684 INP_RUNLOCK(inp); 685 } else 686 error = ENOENT; 687 if (error == 0) 688 error = SYSCTL_OUT(req, &xuc, sizeof(struct xucred)); 689 return (error); 690 } 691 692 SYSCTL_PROC(_net_inet6_udp6, OID_AUTO, getcred, 693 CTLTYPE_OPAQUE | CTLFLAG_RW | CTLFLAG_MPSAFE, 694 0, 0, udp6_getcred, "S,xucred", 695 "Get the xucred of a UDP6 connection"); 696 697 static int 698 udp6_output(struct socket *so, int flags_arg, struct mbuf *m, 699 struct sockaddr *addr6, struct mbuf *control, struct thread *td) 700 { 701 struct inpcb *inp; 702 struct ip6_hdr *ip6; 703 struct udphdr *udp6; 704 struct in6_addr *laddr, *faddr, in6a; 705 struct ip6_pktopts *optp, opt; 706 struct sockaddr_in6 *sin6, tmp; 707 struct epoch_tracker et; 708 int cscov_partial, error, flags, hlen, scope_ambiguous; 709 u_int32_t ulen, plen; 710 uint16_t cscov; 711 u_short fport; 712 uint8_t nxt; 713 714 /* addr6 has been validated in udp6_send(). */ 715 sin6 = (struct sockaddr_in6 *)addr6; 716 717 /* 718 * In contrast to to IPv4 we do not validate the max. packet length 719 * here due to IPv6 Jumbograms (RFC2675). 720 */ 721 722 scope_ambiguous = 0; 723 if (sin6) { 724 /* Protect *addr6 from overwrites. */ 725 tmp = *sin6; 726 sin6 = &tmp; 727 728 /* 729 * Application should provide a proper zone ID or the use of 730 * default zone IDs should be enabled. Unfortunately, some 731 * applications do not behave as it should, so we need a 732 * workaround. Even if an appropriate ID is not determined, 733 * we'll see if we can determine the outgoing interface. If we 734 * can, determine the zone ID based on the interface below. 735 */ 736 if (sin6->sin6_scope_id == 0 && !V_ip6_use_defzone) 737 scope_ambiguous = 1; 738 if ((error = sa6_embedscope(sin6, V_ip6_use_defzone)) != 0) { 739 if (control) 740 m_freem(control); 741 m_freem(m); 742 return (error); 743 } 744 } 745 746 inp = sotoinpcb(so); 747 KASSERT(inp != NULL, ("%s: inp == NULL", __func__)); 748 /* 749 * In the following cases we want a write lock on the inp for either 750 * local operations or for possible route cache updates in the IPv6 751 * output path: 752 * - on connected sockets (sin6 is NULL) for route cache updates, 753 * - when we are not bound to an address and source port (it is 754 * in6_pcbsetport() which will require the write lock). 755 * 756 * We check the inp fields before actually locking the inp, so 757 * here exists a race, and we may WLOCK the inp and end with already 758 * bound one by other thread. This is fine. 759 */ 760 if (sin6 == NULL || (IN6_IS_ADDR_UNSPECIFIED(&inp->in6p_laddr) && 761 inp->inp_lport == 0)) 762 INP_WLOCK(inp); 763 else 764 INP_RLOCK(inp); 765 766 nxt = (inp->inp_socket->so_proto->pr_protocol == IPPROTO_UDP) ? 767 IPPROTO_UDP : IPPROTO_UDPLITE; 768 769 #ifdef INET 770 if ((inp->inp_flags & IN6P_IPV6_V6ONLY) == 0) { 771 int hasv4addr; 772 773 if (sin6 == NULL) 774 hasv4addr = (inp->inp_vflag & INP_IPV4); 775 else 776 hasv4addr = IN6_IS_ADDR_V4MAPPED(&sin6->sin6_addr) 777 ? 1 : 0; 778 if (hasv4addr) { 779 struct pr_usrreqs *pru; 780 781 /* 782 * XXXRW: We release UDP-layer locks before calling 783 * udp_send() in order to avoid recursion. However, 784 * this does mean there is a short window where inp's 785 * fields are unstable. Could this lead to a 786 * potential race in which the factors causing us to 787 * select the UDPv4 output routine are invalidated? 788 */ 789 INP_UNLOCK(inp); 790 if (sin6) 791 in6_sin6_2_sin_in_sock((struct sockaddr *)sin6); 792 pru = inetsw[ip_protox[nxt]].pr_usrreqs; 793 /* addr will just be freed in sendit(). */ 794 return ((*pru->pru_send)(so, flags_arg | PRUS_IPV6, m, 795 (struct sockaddr *)sin6, control, td)); 796 } 797 } else 798 #endif 799 if (sin6 && IN6_IS_ADDR_V4MAPPED(&sin6->sin6_addr)) { 800 /* 801 * Given this is either an IPv6-only socket or no INET is 802 * supported we will fail the send if the given destination 803 * address is a v4mapped address. 804 * 805 * XXXGL: do we leak m and control? 806 */ 807 INP_UNLOCK(inp); 808 return (EINVAL); 809 } 810 811 NET_EPOCH_ENTER(et); 812 if (control) { 813 if ((error = ip6_setpktopts(control, &opt, 814 inp->in6p_outputopts, td->td_ucred, nxt)) != 0) { 815 goto release; 816 } 817 optp = &opt; 818 } else 819 optp = inp->in6p_outputopts; 820 821 if (sin6) { 822 /* 823 * Since we saw no essential reason for calling in_pcbconnect, 824 * we get rid of such kind of logic, and call in6_selectsrc 825 * and in6_pcbsetport in order to fill in the local address 826 * and the local port. 827 */ 828 if (sin6->sin6_port == 0) { 829 error = EADDRNOTAVAIL; 830 goto release; 831 } 832 833 if (!IN6_IS_ADDR_UNSPECIFIED(&inp->in6p_faddr)) { 834 /* how about ::ffff:0.0.0.0 case? */ 835 error = EISCONN; 836 goto release; 837 } 838 839 /* 840 * Given we handle the v4mapped case in the INET block above 841 * assert here that it must not happen anymore. 842 */ 843 KASSERT(!IN6_IS_ADDR_V4MAPPED(&sin6->sin6_addr), 844 ("%s: sin6(%p)->sin6_addr is v4mapped which we " 845 "should have handled.", __func__, sin6)); 846 847 /* This only requires read-locking. */ 848 error = in6_selectsrc_socket(sin6, optp, inp, 849 td->td_ucred, scope_ambiguous, &in6a, NULL); 850 if (error) 851 goto release; 852 laddr = &in6a; 853 854 if (inp->inp_lport == 0) { 855 struct inpcbinfo *pcbinfo; 856 857 INP_WLOCK_ASSERT(inp); 858 859 pcbinfo = udp_get_inpcbinfo(so->so_proto->pr_protocol); 860 INP_HASH_WLOCK(pcbinfo); 861 error = in6_pcbsetport(laddr, inp, td->td_ucred); 862 INP_HASH_WUNLOCK(pcbinfo); 863 if (error != 0) { 864 /* Undo an address bind that may have occurred. */ 865 inp->in6p_laddr = in6addr_any; 866 goto release; 867 } 868 } 869 faddr = &sin6->sin6_addr; 870 fport = sin6->sin6_port; /* allow 0 port */ 871 872 } else { 873 if (IN6_IS_ADDR_UNSPECIFIED(&inp->in6p_faddr)) { 874 error = ENOTCONN; 875 goto release; 876 } 877 laddr = &inp->in6p_laddr; 878 faddr = &inp->in6p_faddr; 879 fport = inp->inp_fport; 880 } 881 882 ulen = m->m_pkthdr.len; 883 plen = sizeof(struct udphdr) + ulen; 884 hlen = sizeof(struct ip6_hdr); 885 886 /* 887 * Calculate data length and get a mbuf 888 * for UDP and IP6 headers. 889 */ 890 M_PREPEND(m, hlen + sizeof(struct udphdr), M_NOWAIT); 891 if (m == NULL) { 892 error = ENOBUFS; 893 goto release; 894 } 895 896 /* 897 * Stuff checksum and output datagram. 898 */ 899 cscov = cscov_partial = 0; 900 udp6 = (struct udphdr *)(mtod(m, caddr_t) + hlen); 901 udp6->uh_sport = inp->inp_lport; /* lport is always set in the PCB */ 902 udp6->uh_dport = fport; 903 if (nxt == IPPROTO_UDPLITE) { 904 struct udpcb *up; 905 906 up = intoudpcb(inp); 907 cscov = up->u_txcslen; 908 if (cscov >= plen) 909 cscov = 0; 910 udp6->uh_ulen = htons(cscov); 911 /* 912 * For UDP-Lite, checksum coverage length of zero means 913 * the entire UDPLite packet is covered by the checksum. 914 */ 915 cscov_partial = (cscov == 0) ? 0 : 1; 916 } else if (plen <= 0xffff) 917 udp6->uh_ulen = htons((u_short)plen); 918 else 919 udp6->uh_ulen = 0; 920 udp6->uh_sum = 0; 921 922 ip6 = mtod(m, struct ip6_hdr *); 923 ip6->ip6_flow = inp->inp_flow & IPV6_FLOWINFO_MASK; 924 ip6->ip6_vfc &= ~IPV6_VERSION_MASK; 925 ip6->ip6_vfc |= IPV6_VERSION; 926 ip6->ip6_plen = htons((u_short)plen); 927 ip6->ip6_nxt = nxt; 928 ip6->ip6_hlim = in6_selecthlim(inp, NULL); 929 ip6->ip6_src = *laddr; 930 ip6->ip6_dst = *faddr; 931 932 #ifdef MAC 933 mac_inpcb_create_mbuf(inp, m); 934 #endif 935 936 if (cscov_partial) { 937 if ((udp6->uh_sum = in6_cksum_partial(m, nxt, 938 sizeof(struct ip6_hdr), plen, cscov)) == 0) 939 udp6->uh_sum = 0xffff; 940 } else { 941 udp6->uh_sum = in6_cksum_pseudo(ip6, plen, nxt, 0); 942 m->m_pkthdr.csum_flags = CSUM_UDP_IPV6; 943 m->m_pkthdr.csum_data = offsetof(struct udphdr, uh_sum); 944 } 945 946 flags = 0; 947 #if defined(ROUTE_MPATH) || defined(RSS) 948 if (CALC_FLOWID_OUTBOUND_SENDTO) { 949 uint32_t hash_type, hash_val; 950 uint8_t pr; 951 952 pr = inp->inp_socket->so_proto->pr_protocol; 953 954 hash_val = fib6_calc_packet_hash(laddr, faddr, 955 inp->inp_lport, fport, pr, &hash_type); 956 m->m_pkthdr.flowid = hash_val; 957 M_HASHTYPE_SET(m, hash_type); 958 } 959 /* do not use inp flowid */ 960 flags |= IP_NODEFAULTFLOWID; 961 #endif 962 963 UDPSTAT_INC(udps_opackets); 964 if (nxt == IPPROTO_UDPLITE) 965 UDPLITE_PROBE(send, NULL, inp, ip6, inp, udp6); 966 else 967 UDP_PROBE(send, NULL, inp, ip6, inp, udp6); 968 error = ip6_output(m, optp, 969 INP_WLOCKED(inp) ? &inp->inp_route6 : NULL, flags, 970 inp->in6p_moptions, NULL, inp); 971 INP_UNLOCK(inp); 972 NET_EPOCH_EXIT(et); 973 974 if (control) { 975 ip6_clearpktopts(&opt, -1); 976 m_freem(control); 977 } 978 return (error); 979 980 release: 981 INP_UNLOCK(inp); 982 NET_EPOCH_EXIT(et); 983 if (control) { 984 ip6_clearpktopts(&opt, -1); 985 m_freem(control); 986 } 987 m_freem(m); 988 989 return (error); 990 } 991 992 static void 993 udp6_abort(struct socket *so) 994 { 995 struct inpcb *inp; 996 struct inpcbinfo *pcbinfo; 997 998 pcbinfo = udp_get_inpcbinfo(so->so_proto->pr_protocol); 999 inp = sotoinpcb(so); 1000 KASSERT(inp != NULL, ("udp6_abort: inp == NULL")); 1001 1002 INP_WLOCK(inp); 1003 #ifdef INET 1004 if (inp->inp_vflag & INP_IPV4) { 1005 struct pr_usrreqs *pru; 1006 uint8_t nxt; 1007 1008 nxt = (inp->inp_socket->so_proto->pr_protocol == IPPROTO_UDP) ? 1009 IPPROTO_UDP : IPPROTO_UDPLITE; 1010 INP_WUNLOCK(inp); 1011 pru = inetsw[ip_protox[nxt]].pr_usrreqs; 1012 (*pru->pru_abort)(so); 1013 return; 1014 } 1015 #endif 1016 1017 if (!IN6_IS_ADDR_UNSPECIFIED(&inp->in6p_faddr)) { 1018 INP_HASH_WLOCK(pcbinfo); 1019 in6_pcbdisconnect(inp); 1020 inp->in6p_laddr = in6addr_any; 1021 INP_HASH_WUNLOCK(pcbinfo); 1022 soisdisconnected(so); 1023 } 1024 INP_WUNLOCK(inp); 1025 } 1026 1027 static int 1028 udp6_attach(struct socket *so, int proto, struct thread *td) 1029 { 1030 struct inpcb *inp; 1031 struct inpcbinfo *pcbinfo; 1032 int error; 1033 1034 pcbinfo = udp_get_inpcbinfo(so->so_proto->pr_protocol); 1035 inp = sotoinpcb(so); 1036 KASSERT(inp == NULL, ("udp6_attach: inp != NULL")); 1037 1038 if (so->so_snd.sb_hiwat == 0 || so->so_rcv.sb_hiwat == 0) { 1039 error = soreserve(so, udp_sendspace, udp_recvspace); 1040 if (error) 1041 return (error); 1042 } 1043 error = in_pcballoc(so, pcbinfo); 1044 if (error) 1045 return (error); 1046 inp = (struct inpcb *)so->so_pcb; 1047 inp->inp_vflag |= INP_IPV6; 1048 if ((inp->inp_flags & IN6P_IPV6_V6ONLY) == 0) 1049 inp->inp_vflag |= INP_IPV4; 1050 inp->in6p_hops = -1; /* use kernel default */ 1051 inp->in6p_cksum = -1; /* just to be sure */ 1052 /* 1053 * XXX: ugly!! 1054 * IPv4 TTL initialization is necessary for an IPv6 socket as well, 1055 * because the socket may be bound to an IPv6 wildcard address, 1056 * which may match an IPv4-mapped IPv6 address. 1057 */ 1058 inp->inp_ip_ttl = V_ip_defttl; 1059 1060 error = udp_newudpcb(inp); 1061 if (error) { 1062 in_pcbdetach(inp); 1063 in_pcbfree(inp); 1064 return (error); 1065 } 1066 INP_WUNLOCK(inp); 1067 return (0); 1068 } 1069 1070 static int 1071 udp6_bind(struct socket *so, struct sockaddr *nam, struct thread *td) 1072 { 1073 struct inpcb *inp; 1074 struct inpcbinfo *pcbinfo; 1075 int error; 1076 u_char vflagsav; 1077 1078 pcbinfo = udp_get_inpcbinfo(so->so_proto->pr_protocol); 1079 inp = sotoinpcb(so); 1080 KASSERT(inp != NULL, ("udp6_bind: inp == NULL")); 1081 1082 if (nam->sa_family != AF_INET6) 1083 return (EAFNOSUPPORT); 1084 if (nam->sa_len != sizeof(struct sockaddr_in6)) 1085 return (EINVAL); 1086 1087 INP_WLOCK(inp); 1088 INP_HASH_WLOCK(pcbinfo); 1089 vflagsav = inp->inp_vflag; 1090 inp->inp_vflag &= ~INP_IPV4; 1091 inp->inp_vflag |= INP_IPV6; 1092 if ((inp->inp_flags & IN6P_IPV6_V6ONLY) == 0) { 1093 struct sockaddr_in6 *sin6_p; 1094 1095 sin6_p = (struct sockaddr_in6 *)nam; 1096 1097 if (IN6_IS_ADDR_UNSPECIFIED(&sin6_p->sin6_addr)) 1098 inp->inp_vflag |= INP_IPV4; 1099 #ifdef INET 1100 else if (IN6_IS_ADDR_V4MAPPED(&sin6_p->sin6_addr)) { 1101 struct sockaddr_in sin; 1102 1103 in6_sin6_2_sin(&sin, sin6_p); 1104 inp->inp_vflag |= INP_IPV4; 1105 inp->inp_vflag &= ~INP_IPV6; 1106 error = in_pcbbind(inp, (struct sockaddr *)&sin, 1107 td->td_ucred); 1108 goto out; 1109 } 1110 #endif 1111 } 1112 1113 error = in6_pcbbind(inp, nam, td->td_ucred); 1114 #ifdef INET 1115 out: 1116 #endif 1117 if (error != 0) 1118 inp->inp_vflag = vflagsav; 1119 INP_HASH_WUNLOCK(pcbinfo); 1120 INP_WUNLOCK(inp); 1121 return (error); 1122 } 1123 1124 static void 1125 udp6_close(struct socket *so) 1126 { 1127 struct inpcb *inp; 1128 struct inpcbinfo *pcbinfo; 1129 1130 pcbinfo = udp_get_inpcbinfo(so->so_proto->pr_protocol); 1131 inp = sotoinpcb(so); 1132 KASSERT(inp != NULL, ("udp6_close: inp == NULL")); 1133 1134 INP_WLOCK(inp); 1135 #ifdef INET 1136 if (inp->inp_vflag & INP_IPV4) { 1137 struct pr_usrreqs *pru; 1138 uint8_t nxt; 1139 1140 nxt = (inp->inp_socket->so_proto->pr_protocol == IPPROTO_UDP) ? 1141 IPPROTO_UDP : IPPROTO_UDPLITE; 1142 INP_WUNLOCK(inp); 1143 pru = inetsw[ip_protox[nxt]].pr_usrreqs; 1144 (*pru->pru_disconnect)(so); 1145 return; 1146 } 1147 #endif 1148 if (!IN6_IS_ADDR_UNSPECIFIED(&inp->in6p_faddr)) { 1149 INP_HASH_WLOCK(pcbinfo); 1150 in6_pcbdisconnect(inp); 1151 inp->in6p_laddr = in6addr_any; 1152 INP_HASH_WUNLOCK(pcbinfo); 1153 soisdisconnected(so); 1154 } 1155 INP_WUNLOCK(inp); 1156 } 1157 1158 static int 1159 udp6_connect(struct socket *so, struct sockaddr *nam, struct thread *td) 1160 { 1161 #ifdef INET 1162 struct epoch_tracker et; 1163 #endif 1164 struct inpcb *inp; 1165 struct inpcbinfo *pcbinfo; 1166 struct sockaddr_in6 *sin6; 1167 int error; 1168 u_char vflagsav; 1169 1170 pcbinfo = udp_get_inpcbinfo(so->so_proto->pr_protocol); 1171 inp = sotoinpcb(so); 1172 KASSERT(inp != NULL, ("udp6_connect: inp == NULL")); 1173 1174 sin6 = (struct sockaddr_in6 *)nam; 1175 if (sin6->sin6_family != AF_INET6) 1176 return (EAFNOSUPPORT); 1177 if (sin6->sin6_len != sizeof(*sin6)) 1178 return (EINVAL); 1179 1180 /* 1181 * XXXRW: Need to clarify locking of v4/v6 flags. 1182 */ 1183 INP_WLOCK(inp); 1184 #ifdef INET 1185 if (IN6_IS_ADDR_V4MAPPED(&sin6->sin6_addr)) { 1186 struct sockaddr_in sin; 1187 1188 if ((inp->inp_flags & IN6P_IPV6_V6ONLY) != 0) { 1189 error = EINVAL; 1190 goto out; 1191 } 1192 if ((inp->inp_vflag & INP_IPV4) == 0) { 1193 error = EAFNOSUPPORT; 1194 goto out; 1195 } 1196 if (inp->inp_faddr.s_addr != INADDR_ANY) { 1197 error = EISCONN; 1198 goto out; 1199 } 1200 in6_sin6_2_sin(&sin, sin6); 1201 error = prison_remote_ip4(td->td_ucred, &sin.sin_addr); 1202 if (error != 0) 1203 goto out; 1204 vflagsav = inp->inp_vflag; 1205 inp->inp_vflag |= INP_IPV4; 1206 inp->inp_vflag &= ~INP_IPV6; 1207 NET_EPOCH_ENTER(et); 1208 INP_HASH_WLOCK(pcbinfo); 1209 error = in_pcbconnect(inp, (struct sockaddr *)&sin, 1210 td->td_ucred, true); 1211 INP_HASH_WUNLOCK(pcbinfo); 1212 NET_EPOCH_EXIT(et); 1213 /* 1214 * If connect succeeds, mark socket as connected. If 1215 * connect fails and socket is unbound, reset inp_vflag 1216 * field. 1217 */ 1218 if (error == 0) 1219 soisconnected(so); 1220 else if (inp->inp_laddr.s_addr == INADDR_ANY && 1221 inp->inp_lport == 0) 1222 inp->inp_vflag = vflagsav; 1223 goto out; 1224 } else { 1225 if ((inp->inp_vflag & INP_IPV6) == 0) { 1226 error = EAFNOSUPPORT; 1227 goto out; 1228 } 1229 } 1230 #endif 1231 if (!IN6_IS_ADDR_UNSPECIFIED(&inp->in6p_faddr)) { 1232 error = EISCONN; 1233 goto out; 1234 } 1235 error = prison_remote_ip6(td->td_ucred, &sin6->sin6_addr); 1236 if (error != 0) 1237 goto out; 1238 vflagsav = inp->inp_vflag; 1239 inp->inp_vflag &= ~INP_IPV4; 1240 inp->inp_vflag |= INP_IPV6; 1241 INP_HASH_WLOCK(pcbinfo); 1242 error = in6_pcbconnect(inp, nam, td->td_ucred); 1243 INP_HASH_WUNLOCK(pcbinfo); 1244 /* 1245 * If connect succeeds, mark socket as connected. If 1246 * connect fails and socket is unbound, reset inp_vflag 1247 * field. 1248 */ 1249 if (error == 0) 1250 soisconnected(so); 1251 else if (IN6_IS_ADDR_UNSPECIFIED(&inp->in6p_laddr) && 1252 inp->inp_lport == 0) 1253 inp->inp_vflag = vflagsav; 1254 out: 1255 INP_WUNLOCK(inp); 1256 return (error); 1257 } 1258 1259 static void 1260 udp6_detach(struct socket *so) 1261 { 1262 struct inpcb *inp; 1263 struct udpcb *up; 1264 1265 inp = sotoinpcb(so); 1266 KASSERT(inp != NULL, ("udp6_detach: inp == NULL")); 1267 1268 INP_WLOCK(inp); 1269 up = intoudpcb(inp); 1270 KASSERT(up != NULL, ("%s: up == NULL", __func__)); 1271 in_pcbdetach(inp); 1272 in_pcbfree(inp); 1273 udp_discardcb(up); 1274 } 1275 1276 static int 1277 udp6_disconnect(struct socket *so) 1278 { 1279 struct inpcb *inp; 1280 struct inpcbinfo *pcbinfo; 1281 1282 pcbinfo = udp_get_inpcbinfo(so->so_proto->pr_protocol); 1283 inp = sotoinpcb(so); 1284 KASSERT(inp != NULL, ("udp6_disconnect: inp == NULL")); 1285 1286 INP_WLOCK(inp); 1287 #ifdef INET 1288 if (inp->inp_vflag & INP_IPV4) { 1289 struct pr_usrreqs *pru; 1290 uint8_t nxt; 1291 1292 nxt = (inp->inp_socket->so_proto->pr_protocol == IPPROTO_UDP) ? 1293 IPPROTO_UDP : IPPROTO_UDPLITE; 1294 INP_WUNLOCK(inp); 1295 pru = inetsw[ip_protox[nxt]].pr_usrreqs; 1296 (void)(*pru->pru_disconnect)(so); 1297 return (0); 1298 } 1299 #endif 1300 1301 if (IN6_IS_ADDR_UNSPECIFIED(&inp->in6p_faddr)) { 1302 INP_WUNLOCK(inp); 1303 return (ENOTCONN); 1304 } 1305 1306 INP_HASH_WLOCK(pcbinfo); 1307 in6_pcbdisconnect(inp); 1308 inp->in6p_laddr = in6addr_any; 1309 INP_HASH_WUNLOCK(pcbinfo); 1310 SOCK_LOCK(so); 1311 so->so_state &= ~SS_ISCONNECTED; /* XXX */ 1312 SOCK_UNLOCK(so); 1313 INP_WUNLOCK(inp); 1314 return (0); 1315 } 1316 1317 static int 1318 udp6_send(struct socket *so, int flags, struct mbuf *m, 1319 struct sockaddr *addr, struct mbuf *control, struct thread *td) 1320 { 1321 int error; 1322 1323 if (addr) { 1324 if (addr->sa_len != sizeof(struct sockaddr_in6)) { 1325 error = EINVAL; 1326 goto bad; 1327 } 1328 if (addr->sa_family != AF_INET6) { 1329 error = EAFNOSUPPORT; 1330 goto bad; 1331 } 1332 } 1333 1334 return (udp6_output(so, flags, m, addr, control, td)); 1335 1336 bad: 1337 if (control) 1338 m_freem(control); 1339 m_freem(m); 1340 return (error); 1341 } 1342 1343 struct pr_usrreqs udp6_usrreqs = { 1344 .pru_abort = udp6_abort, 1345 .pru_attach = udp6_attach, 1346 .pru_bind = udp6_bind, 1347 .pru_connect = udp6_connect, 1348 .pru_control = in6_control, 1349 .pru_detach = udp6_detach, 1350 .pru_disconnect = udp6_disconnect, 1351 .pru_peeraddr = in6_mapped_peeraddr, 1352 .pru_send = udp6_send, 1353 .pru_shutdown = udp_shutdown, 1354 .pru_sockaddr = in6_mapped_sockaddr, 1355 .pru_soreceive = soreceive_dgram, 1356 .pru_sosend = sosend_dgram, 1357 .pru_sosetlabel = in_pcbsosetlabel, 1358 .pru_close = udp6_close 1359 }; 1360