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