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_rss.h" 79 80 #include <sys/param.h> 81 #include <sys/jail.h> 82 #include <sys/kernel.h> 83 #include <sys/lock.h> 84 #include <sys/mbuf.h> 85 #include <sys/priv.h> 86 #include <sys/proc.h> 87 #include <sys/protosw.h> 88 #include <sys/sdt.h> 89 #include <sys/signalvar.h> 90 #include <sys/socket.h> 91 #include <sys/socketvar.h> 92 #include <sys/sx.h> 93 #include <sys/sysctl.h> 94 #include <sys/syslog.h> 95 #include <sys/systm.h> 96 97 #include <net/if.h> 98 #include <net/if_var.h> 99 #include <net/if_types.h> 100 #include <net/route.h> 101 #include <net/rss_config.h> 102 103 #include <netinet/in.h> 104 #include <netinet/in_kdtrace.h> 105 #include <netinet/in_pcb.h> 106 #include <netinet/in_systm.h> 107 #include <netinet/in_var.h> 108 #include <netinet/ip.h> 109 #include <netinet/ip6.h> 110 #include <netinet/icmp6.h> 111 #include <netinet/ip_var.h> 112 #include <netinet/udp.h> 113 #include <netinet/udp_var.h> 114 #include <netinet/udplite.h> 115 116 #include <netinet6/ip6protosw.h> 117 #include <netinet6/ip6_var.h> 118 #include <netinet6/in6_pcb.h> 119 #include <netinet6/in6_rss.h> 120 #include <netinet6/udp6_var.h> 121 #include <netinet6/scope6_var.h> 122 123 #include <netipsec/ipsec_support.h> 124 125 #include <security/mac/mac_framework.h> 126 127 /* 128 * UDP protocol implementation. 129 * Per RFC 768, August, 1980. 130 */ 131 132 extern struct protosw inetsw[]; 133 static void udp6_detach(struct socket *so); 134 135 static int 136 udp6_append(struct inpcb *inp, struct mbuf *n, int off, 137 struct sockaddr_in6 *fromsa) 138 { 139 struct socket *so; 140 struct mbuf *opts = NULL, *tmp_opts; 141 struct udpcb *up; 142 143 INP_LOCK_ASSERT(inp); 144 145 /* 146 * Engage the tunneling protocol. 147 */ 148 up = intoudpcb(inp); 149 if (up->u_tun_func != NULL) { 150 in_pcbref(inp); 151 INP_RUNLOCK(inp); 152 (*up->u_tun_func)(n, off, inp, (struct sockaddr *)&fromsa[0], 153 up->u_tun_ctx); 154 INP_RLOCK(inp); 155 return (in_pcbrele_rlocked(inp)); 156 } 157 #if defined(IPSEC) || defined(IPSEC_SUPPORT) 158 /* Check AH/ESP integrity. */ 159 if (IPSEC_ENABLED(ipv6)) { 160 if (IPSEC_CHECK_POLICY(ipv6, n, inp) != 0) { 161 m_freem(n); 162 return (0); 163 } 164 } 165 #endif /* IPSEC */ 166 #ifdef MAC 167 if (mac_inpcb_check_deliver(inp, n) != 0) { 168 m_freem(n); 169 return (0); 170 } 171 #endif 172 opts = NULL; 173 if (inp->inp_flags & INP_CONTROLOPTS || 174 inp->inp_socket->so_options & SO_TIMESTAMP) 175 ip6_savecontrol(inp, n, &opts); 176 if ((inp->inp_vflag & INP_IPV6) && (inp->inp_flags2 & INP_ORIGDSTADDR)) { 177 tmp_opts = sbcreatecontrol((caddr_t)&fromsa[1], 178 sizeof(struct sockaddr_in6), IPV6_ORIGDSTADDR, IPPROTO_IPV6); 179 if (tmp_opts) { 180 if (opts) { 181 tmp_opts->m_next = opts; 182 opts = tmp_opts; 183 } else 184 opts = tmp_opts; 185 } 186 187 } 188 m_adj(n, off + sizeof(struct udphdr)); 189 190 so = inp->inp_socket; 191 SOCKBUF_LOCK(&so->so_rcv); 192 if (sbappendaddr_locked(&so->so_rcv, (struct sockaddr *)&fromsa[0], n, 193 opts) == 0) { 194 SOCKBUF_UNLOCK(&so->so_rcv); 195 m_freem(n); 196 if (opts) 197 m_freem(opts); 198 UDPSTAT_INC(udps_fullsock); 199 } else 200 sorwakeup_locked(so); 201 return (0); 202 } 203 204 int 205 udp6_input(struct mbuf **mp, int *offp, int proto) 206 { 207 struct mbuf *m = *mp; 208 struct ifnet *ifp; 209 struct ip6_hdr *ip6; 210 struct udphdr *uh; 211 struct inpcb *inp; 212 struct inpcbinfo *pcbinfo; 213 struct udpcb *up; 214 int off = *offp; 215 int cscov_partial; 216 int plen, ulen; 217 struct sockaddr_in6 fromsa[2]; 218 struct m_tag *fwd_tag; 219 uint16_t uh_sum; 220 uint8_t nxt; 221 222 NET_EPOCH_ASSERT(); 223 224 ifp = m->m_pkthdr.rcvif; 225 226 if (m->m_len < off + sizeof(struct udphdr)) { 227 m = m_pullup(m, off + sizeof(struct udphdr)); 228 if (m == NULL) { 229 IP6STAT_INC(ip6s_exthdrtoolong); 230 *mp = NULL; 231 return (IPPROTO_DONE); 232 } 233 } 234 ip6 = mtod(m, struct ip6_hdr *); 235 uh = (struct udphdr *)((caddr_t)ip6 + off); 236 237 UDPSTAT_INC(udps_ipackets); 238 239 /* 240 * Destination port of 0 is illegal, based on RFC768. 241 */ 242 if (uh->uh_dport == 0) 243 goto badunlocked; 244 245 plen = ntohs(ip6->ip6_plen) - off + sizeof(*ip6); 246 ulen = ntohs((u_short)uh->uh_ulen); 247 248 nxt = proto; 249 cscov_partial = (nxt == IPPROTO_UDPLITE) ? 1 : 0; 250 if (nxt == IPPROTO_UDPLITE) { 251 /* Zero means checksum over the complete packet. */ 252 if (ulen == 0) 253 ulen = plen; 254 if (ulen == plen) 255 cscov_partial = 0; 256 if ((ulen < sizeof(struct udphdr)) || (ulen > plen)) { 257 /* XXX: What is the right UDPLite MIB counter? */ 258 goto badunlocked; 259 } 260 if (uh->uh_sum == 0) { 261 /* XXX: What is the right UDPLite MIB counter? */ 262 goto badunlocked; 263 } 264 } else { 265 if ((ulen < sizeof(struct udphdr)) || (plen != ulen)) { 266 UDPSTAT_INC(udps_badlen); 267 goto badunlocked; 268 } 269 if (uh->uh_sum == 0) { 270 UDPSTAT_INC(udps_nosum); 271 goto badunlocked; 272 } 273 } 274 275 if ((m->m_pkthdr.csum_flags & CSUM_DATA_VALID_IPV6) && 276 !cscov_partial) { 277 if (m->m_pkthdr.csum_flags & CSUM_PSEUDO_HDR) 278 uh_sum = m->m_pkthdr.csum_data; 279 else 280 uh_sum = in6_cksum_pseudo(ip6, ulen, nxt, 281 m->m_pkthdr.csum_data); 282 uh_sum ^= 0xffff; 283 } else 284 uh_sum = in6_cksum_partial(m, nxt, off, plen, ulen); 285 286 if (uh_sum != 0) { 287 UDPSTAT_INC(udps_badsum); 288 goto badunlocked; 289 } 290 291 /* 292 * Construct sockaddr format source address. 293 */ 294 init_sin6(&fromsa[0], m, 0); 295 fromsa[0].sin6_port = uh->uh_sport; 296 init_sin6(&fromsa[1], m, 1); 297 fromsa[1].sin6_port = uh->uh_dport; 298 299 pcbinfo = udp_get_inpcbinfo(nxt); 300 if (IN6_IS_ADDR_MULTICAST(&ip6->ip6_dst)) { 301 struct inpcb *last; 302 struct inpcbhead *pcblist; 303 struct ip6_moptions *imo; 304 305 /* 306 * In the event that laddr should be set to the link-local 307 * address (this happens in RIPng), the multicast address 308 * specified in the received packet will not match laddr. To 309 * handle this situation, matching is relaxed if the 310 * receiving interface is the same as one specified in the 311 * socket and if the destination multicast address matches 312 * one of the multicast groups specified in the socket. 313 */ 314 315 /* 316 * KAME note: traditionally we dropped udpiphdr from mbuf 317 * here. We need udphdr for IPsec processing so we do that 318 * later. 319 */ 320 pcblist = udp_get_pcblist(nxt); 321 last = NULL; 322 CK_LIST_FOREACH(inp, pcblist, inp_list) { 323 if ((inp->inp_vflag & INP_IPV6) == 0) 324 continue; 325 if (inp->inp_lport != uh->uh_dport) 326 continue; 327 if (inp->inp_fport != 0 && 328 inp->inp_fport != uh->uh_sport) 329 continue; 330 if (!IN6_IS_ADDR_UNSPECIFIED(&inp->in6p_laddr)) { 331 if (!IN6_ARE_ADDR_EQUAL(&inp->in6p_laddr, 332 &ip6->ip6_dst)) 333 continue; 334 } 335 if (!IN6_IS_ADDR_UNSPECIFIED(&inp->in6p_faddr)) { 336 if (!IN6_ARE_ADDR_EQUAL(&inp->in6p_faddr, 337 &ip6->ip6_src) || 338 inp->inp_fport != uh->uh_sport) 339 continue; 340 } 341 342 /* 343 * XXXRW: Because we weren't holding either the inpcb 344 * or the hash lock when we checked for a match 345 * before, we should probably recheck now that the 346 * inpcb lock is (supposed to be) held. 347 */ 348 349 /* 350 * Handle socket delivery policy for any-source 351 * and source-specific multicast. [RFC3678] 352 */ 353 imo = inp->in6p_moptions; 354 if (imo && IN6_IS_ADDR_MULTICAST(&ip6->ip6_dst)) { 355 struct sockaddr_in6 mcaddr; 356 int blocked; 357 358 INP_RLOCK(inp); 359 if (__predict_false(inp->inp_flags2 & INP_FREED)) { 360 INP_RUNLOCK(inp); 361 continue; 362 } 363 364 bzero(&mcaddr, sizeof(struct sockaddr_in6)); 365 mcaddr.sin6_len = sizeof(struct sockaddr_in6); 366 mcaddr.sin6_family = AF_INET6; 367 mcaddr.sin6_addr = ip6->ip6_dst; 368 369 blocked = im6o_mc_filter(imo, ifp, 370 (struct sockaddr *)&mcaddr, 371 (struct sockaddr *)&fromsa[0]); 372 if (blocked != MCAST_PASS) { 373 if (blocked == MCAST_NOTGMEMBER) 374 IP6STAT_INC(ip6s_notmember); 375 if (blocked == MCAST_NOTSMEMBER || 376 blocked == MCAST_MUTED) 377 UDPSTAT_INC(udps_filtermcast); 378 INP_RUNLOCK(inp); /* XXX */ 379 continue; 380 } 381 382 INP_RUNLOCK(inp); 383 } 384 if (last != NULL) { 385 struct mbuf *n; 386 387 if ((n = m_copym(m, 0, M_COPYALL, M_NOWAIT)) != 388 NULL) { 389 INP_RLOCK(last); 390 if (__predict_true(last->inp_flags2 & INP_FREED) == 0) { 391 if (nxt == IPPROTO_UDPLITE) 392 UDPLITE_PROBE(receive, NULL, last, 393 ip6, last, uh); 394 else 395 UDP_PROBE(receive, NULL, last, 396 ip6, last, uh); 397 if (udp6_append(last, n, off, fromsa)) { 398 /* XXX-BZ do we leak m here? */ 399 *mp = NULL; 400 return (IPPROTO_DONE); 401 } 402 } 403 INP_RUNLOCK(last); 404 } 405 } 406 last = inp; 407 /* 408 * Don't look for additional matches if this one does 409 * not have either the SO_REUSEPORT or SO_REUSEADDR 410 * socket options set. This heuristic avoids 411 * searching through all pcbs in the common case of a 412 * non-shared port. It assumes that an application 413 * will never clear these options after setting them. 414 */ 415 if ((last->inp_socket->so_options & 416 (SO_REUSEPORT|SO_REUSEPORT_LB|SO_REUSEADDR)) == 0) 417 break; 418 } 419 420 if (last == NULL) { 421 /* 422 * No matching pcb found; discard datagram. (No need 423 * to send an ICMP Port Unreachable for a broadcast 424 * or multicast datgram.) 425 */ 426 UDPSTAT_INC(udps_noport); 427 UDPSTAT_INC(udps_noportmcast); 428 goto badunlocked; 429 } 430 INP_RLOCK(last); 431 if (__predict_true(last->inp_flags2 & INP_FREED) == 0) { 432 if (nxt == IPPROTO_UDPLITE) 433 UDPLITE_PROBE(receive, NULL, last, ip6, last, uh); 434 else 435 UDP_PROBE(receive, NULL, last, ip6, last, uh); 436 if (udp6_append(last, m, off, fromsa) == 0) 437 INP_RUNLOCK(last); 438 } else 439 INP_RUNLOCK(last); 440 *mp = NULL; 441 return (IPPROTO_DONE); 442 } 443 /* 444 * Locate pcb for datagram. 445 */ 446 447 /* 448 * Grab info from PACKET_TAG_IPFORWARD tag prepended to the chain. 449 */ 450 if ((m->m_flags & M_IP6_NEXTHOP) && 451 (fwd_tag = m_tag_find(m, PACKET_TAG_IPFORWARD, NULL)) != NULL) { 452 struct sockaddr_in6 *next_hop6; 453 454 next_hop6 = (struct sockaddr_in6 *)(fwd_tag + 1); 455 456 /* 457 * Transparently forwarded. Pretend to be the destination. 458 * Already got one like this? 459 */ 460 inp = in6_pcblookup_mbuf(pcbinfo, &ip6->ip6_src, 461 uh->uh_sport, &ip6->ip6_dst, uh->uh_dport, 462 INPLOOKUP_RLOCKPCB, m->m_pkthdr.rcvif, m); 463 if (!inp) { 464 /* 465 * It's new. Try to find the ambushing socket. 466 * Because we've rewritten the destination address, 467 * any hardware-generated hash is ignored. 468 */ 469 inp = in6_pcblookup(pcbinfo, &ip6->ip6_src, 470 uh->uh_sport, &next_hop6->sin6_addr, 471 next_hop6->sin6_port ? htons(next_hop6->sin6_port) : 472 uh->uh_dport, INPLOOKUP_WILDCARD | 473 INPLOOKUP_RLOCKPCB, m->m_pkthdr.rcvif); 474 } 475 /* Remove the tag from the packet. We don't need it anymore. */ 476 m_tag_delete(m, fwd_tag); 477 m->m_flags &= ~M_IP6_NEXTHOP; 478 } else 479 inp = in6_pcblookup_mbuf(pcbinfo, &ip6->ip6_src, 480 uh->uh_sport, &ip6->ip6_dst, uh->uh_dport, 481 INPLOOKUP_WILDCARD | INPLOOKUP_RLOCKPCB, 482 m->m_pkthdr.rcvif, m); 483 if (inp == NULL) { 484 if (V_udp_log_in_vain) { 485 char ip6bufs[INET6_ADDRSTRLEN]; 486 char ip6bufd[INET6_ADDRSTRLEN]; 487 488 log(LOG_INFO, 489 "Connection attempt to UDP [%s]:%d from [%s]:%d\n", 490 ip6_sprintf(ip6bufd, &ip6->ip6_dst), 491 ntohs(uh->uh_dport), 492 ip6_sprintf(ip6bufs, &ip6->ip6_src), 493 ntohs(uh->uh_sport)); 494 } 495 if (nxt == IPPROTO_UDPLITE) 496 UDPLITE_PROBE(receive, NULL, NULL, ip6, NULL, uh); 497 else 498 UDP_PROBE(receive, NULL, NULL, ip6, NULL, uh); 499 UDPSTAT_INC(udps_noport); 500 if (m->m_flags & M_MCAST) { 501 printf("UDP6: M_MCAST is set in a unicast packet.\n"); 502 UDPSTAT_INC(udps_noportmcast); 503 goto badunlocked; 504 } 505 if (V_udp_blackhole) 506 goto badunlocked; 507 icmp6_error(m, ICMP6_DST_UNREACH, ICMP6_DST_UNREACH_NOPORT, 0); 508 *mp = NULL; 509 return (IPPROTO_DONE); 510 } 511 INP_RLOCK_ASSERT(inp); 512 up = intoudpcb(inp); 513 if (cscov_partial) { 514 if (up->u_rxcslen == 0 || up->u_rxcslen > ulen) { 515 INP_RUNLOCK(inp); 516 m_freem(m); 517 *mp = NULL; 518 return (IPPROTO_DONE); 519 } 520 } 521 if (nxt == IPPROTO_UDPLITE) 522 UDPLITE_PROBE(receive, NULL, inp, ip6, inp, uh); 523 else 524 UDP_PROBE(receive, NULL, inp, ip6, inp, uh); 525 if (udp6_append(inp, m, off, fromsa) == 0) 526 INP_RUNLOCK(inp); 527 *mp = NULL; 528 return (IPPROTO_DONE); 529 530 badunlocked: 531 m_freem(m); 532 *mp = NULL; 533 return (IPPROTO_DONE); 534 } 535 536 static void 537 udp6_common_ctlinput(int cmd, struct sockaddr *sa, void *d, 538 struct inpcbinfo *pcbinfo) 539 { 540 struct udphdr uh; 541 struct ip6_hdr *ip6; 542 struct mbuf *m; 543 int off = 0; 544 struct ip6ctlparam *ip6cp = NULL; 545 const struct sockaddr_in6 *sa6_src = NULL; 546 void *cmdarg; 547 struct inpcb *(*notify)(struct inpcb *, int) = udp_notify; 548 struct udp_portonly { 549 u_int16_t uh_sport; 550 u_int16_t uh_dport; 551 } *uhp; 552 553 if (sa->sa_family != AF_INET6 || 554 sa->sa_len != sizeof(struct sockaddr_in6)) 555 return; 556 557 if ((unsigned)cmd >= PRC_NCMDS) 558 return; 559 if (PRC_IS_REDIRECT(cmd)) 560 notify = in6_rtchange, d = NULL; 561 else if (cmd == PRC_HOSTDEAD) 562 d = NULL; 563 else if (inet6ctlerrmap[cmd] == 0) 564 return; 565 566 /* if the parameter is from icmp6, decode it. */ 567 if (d != NULL) { 568 ip6cp = (struct ip6ctlparam *)d; 569 m = ip6cp->ip6c_m; 570 ip6 = ip6cp->ip6c_ip6; 571 off = ip6cp->ip6c_off; 572 cmdarg = ip6cp->ip6c_cmdarg; 573 sa6_src = ip6cp->ip6c_src; 574 } else { 575 m = NULL; 576 ip6 = NULL; 577 cmdarg = NULL; 578 sa6_src = &sa6_any; 579 } 580 581 if (ip6) { 582 /* 583 * XXX: We assume that when IPV6 is non NULL, 584 * M and OFF are valid. 585 */ 586 587 /* Check if we can safely examine src and dst ports. */ 588 if (m->m_pkthdr.len < off + sizeof(*uhp)) 589 return; 590 591 bzero(&uh, sizeof(uh)); 592 m_copydata(m, off, sizeof(*uhp), (caddr_t)&uh); 593 594 if (!PRC_IS_REDIRECT(cmd)) { 595 /* Check to see if its tunneled */ 596 struct inpcb *inp; 597 inp = in6_pcblookup_mbuf(pcbinfo, &ip6->ip6_dst, 598 uh.uh_dport, &ip6->ip6_src, uh.uh_sport, 599 INPLOOKUP_WILDCARD | INPLOOKUP_RLOCKPCB, 600 m->m_pkthdr.rcvif, m); 601 if (inp != NULL) { 602 struct udpcb *up; 603 604 up = intoudpcb(inp); 605 if (up->u_icmp_func) { 606 /* Yes it is. */ 607 INP_RUNLOCK(inp); 608 (*up->u_icmp_func)(cmd, (struct sockaddr *)ip6cp->ip6c_src, 609 d, up->u_tun_ctx); 610 return; 611 } else { 612 /* Can't find it. */ 613 INP_RUNLOCK(inp); 614 } 615 } 616 } 617 (void)in6_pcbnotify(pcbinfo, sa, uh.uh_dport, 618 (struct sockaddr *)ip6cp->ip6c_src, uh.uh_sport, cmd, 619 cmdarg, notify); 620 } else 621 (void)in6_pcbnotify(pcbinfo, sa, 0, 622 (const struct sockaddr *)sa6_src, 0, cmd, cmdarg, notify); 623 } 624 625 void 626 udp6_ctlinput(int cmd, struct sockaddr *sa, void *d) 627 { 628 629 return (udp6_common_ctlinput(cmd, sa, d, &V_udbinfo)); 630 } 631 632 void 633 udplite6_ctlinput(int cmd, struct sockaddr *sa, void *d) 634 { 635 636 return (udp6_common_ctlinput(cmd, sa, d, &V_ulitecbinfo)); 637 } 638 639 static int 640 udp6_getcred(SYSCTL_HANDLER_ARGS) 641 { 642 struct xucred xuc; 643 struct sockaddr_in6 addrs[2]; 644 struct epoch_tracker et; 645 struct inpcb *inp; 646 int error; 647 648 error = priv_check(req->td, PRIV_NETINET_GETCRED); 649 if (error) 650 return (error); 651 652 if (req->newlen != sizeof(addrs)) 653 return (EINVAL); 654 if (req->oldlen != sizeof(struct xucred)) 655 return (EINVAL); 656 error = SYSCTL_IN(req, addrs, sizeof(addrs)); 657 if (error) 658 return (error); 659 if ((error = sa6_embedscope(&addrs[0], V_ip6_use_defzone)) != 0 || 660 (error = sa6_embedscope(&addrs[1], V_ip6_use_defzone)) != 0) { 661 return (error); 662 } 663 NET_EPOCH_ENTER(et); 664 inp = in6_pcblookup(&V_udbinfo, &addrs[1].sin6_addr, 665 addrs[1].sin6_port, &addrs[0].sin6_addr, addrs[0].sin6_port, 666 INPLOOKUP_WILDCARD | INPLOOKUP_RLOCKPCB, NULL); 667 NET_EPOCH_EXIT(et); 668 if (inp != NULL) { 669 INP_RLOCK_ASSERT(inp); 670 if (inp->inp_socket == NULL) 671 error = ENOENT; 672 if (error == 0) 673 error = cr_canseesocket(req->td->td_ucred, 674 inp->inp_socket); 675 if (error == 0) 676 cru2x(inp->inp_cred, &xuc); 677 INP_RUNLOCK(inp); 678 } else 679 error = ENOENT; 680 if (error == 0) 681 error = SYSCTL_OUT(req, &xuc, sizeof(struct xucred)); 682 return (error); 683 } 684 685 SYSCTL_PROC(_net_inet6_udp6, OID_AUTO, getcred, CTLTYPE_OPAQUE|CTLFLAG_RW, 0, 686 0, udp6_getcred, "S,xucred", "Get the xucred of a UDP6 connection"); 687 688 static int 689 udp6_output(struct socket *so, int flags_arg, struct mbuf *m, 690 struct sockaddr *addr6, struct mbuf *control, struct thread *td) 691 { 692 struct inpcb *inp; 693 struct ip6_hdr *ip6; 694 struct udphdr *udp6; 695 struct in6_addr *laddr, *faddr, in6a; 696 struct ip6_pktopts *optp, opt; 697 struct sockaddr_in6 *sin6, tmp; 698 struct epoch_tracker et; 699 int cscov_partial, error, flags, hlen, scope_ambiguous; 700 u_int32_t ulen, plen; 701 uint16_t cscov; 702 u_short fport; 703 uint8_t nxt; 704 705 /* addr6 has been validated in udp6_send(). */ 706 sin6 = (struct sockaddr_in6 *)addr6; 707 708 /* 709 * In contrast to to IPv4 we do not validate the max. packet length 710 * here due to IPv6 Jumbograms (RFC2675). 711 */ 712 713 scope_ambiguous = 0; 714 if (sin6) { 715 /* Protect *addr6 from overwrites. */ 716 tmp = *sin6; 717 sin6 = &tmp; 718 719 /* 720 * Application should provide a proper zone ID or the use of 721 * default zone IDs should be enabled. Unfortunately, some 722 * applications do not behave as it should, so we need a 723 * workaround. Even if an appropriate ID is not determined, 724 * we'll see if we can determine the outgoing interface. If we 725 * can, determine the zone ID based on the interface below. 726 */ 727 if (sin6->sin6_scope_id == 0 && !V_ip6_use_defzone) 728 scope_ambiguous = 1; 729 if ((error = sa6_embedscope(sin6, V_ip6_use_defzone)) != 0) { 730 if (control) 731 m_freem(control); 732 m_freem(m); 733 return (error); 734 } 735 } 736 737 inp = sotoinpcb(so); 738 KASSERT(inp != NULL, ("%s: inp == NULL", __func__)); 739 /* 740 * In the following cases we want a write lock on the inp for either 741 * local operations or for possible route cache updates in the IPv6 742 * output path: 743 * - on connected sockets (sin6 is NULL) for route cache updates, 744 * - when we are not bound to an address and source port (it is 745 * in6_pcbsetport() which will require the write lock). 746 * 747 * We check the inp fields before actually locking the inp, so 748 * here exists a race, and we may WLOCK the inp and end with already 749 * bound one by other thread. This is fine. 750 */ 751 if (sin6 == NULL || (IN6_IS_ADDR_UNSPECIFIED(&inp->in6p_laddr) && 752 inp->inp_lport == 0)) 753 INP_WLOCK(inp); 754 else 755 INP_RLOCK(inp); 756 757 nxt = (inp->inp_socket->so_proto->pr_protocol == IPPROTO_UDP) ? 758 IPPROTO_UDP : IPPROTO_UDPLITE; 759 760 #ifdef INET 761 if ((inp->inp_flags & IN6P_IPV6_V6ONLY) == 0) { 762 int hasv4addr; 763 764 if (sin6 == NULL) 765 hasv4addr = (inp->inp_vflag & INP_IPV4); 766 else 767 hasv4addr = IN6_IS_ADDR_V4MAPPED(&sin6->sin6_addr) 768 ? 1 : 0; 769 if (hasv4addr) { 770 struct pr_usrreqs *pru; 771 772 /* 773 * XXXRW: We release UDP-layer locks before calling 774 * udp_send() in order to avoid recursion. However, 775 * this does mean there is a short window where inp's 776 * fields are unstable. Could this lead to a 777 * potential race in which the factors causing us to 778 * select the UDPv4 output routine are invalidated? 779 */ 780 INP_UNLOCK(inp); 781 if (sin6) 782 in6_sin6_2_sin_in_sock((struct sockaddr *)sin6); 783 pru = inetsw[ip_protox[nxt]].pr_usrreqs; 784 /* addr will just be freed in sendit(). */ 785 return ((*pru->pru_send)(so, flags_arg, m, 786 (struct sockaddr *)sin6, control, td)); 787 } 788 } else 789 #endif 790 if (sin6 && IN6_IS_ADDR_V4MAPPED(&sin6->sin6_addr)) { 791 /* 792 * Given this is either an IPv6-only socket or no INET is 793 * supported we will fail the send if the given destination 794 * address is a v4mapped address. 795 * 796 * XXXGL: do we leak m and control? 797 */ 798 INP_UNLOCK(inp); 799 return (EINVAL); 800 } 801 802 if (control) { 803 if ((error = ip6_setpktopts(control, &opt, 804 inp->in6p_outputopts, td->td_ucred, nxt)) != 0) { 805 INP_UNLOCK(inp); 806 ip6_clearpktopts(&opt, -1); 807 if (control) 808 m_freem(control); 809 m_freem(m); 810 return (error); 811 } 812 optp = &opt; 813 } else 814 optp = inp->in6p_outputopts; 815 816 NET_EPOCH_ENTER(et); 817 if (sin6) { 818 819 /* 820 * Since we saw no essential reason for calling in_pcbconnect, 821 * we get rid of such kind of logic, and call in6_selectsrc 822 * and in6_pcbsetport in order to fill in the local address 823 * and the local port. 824 */ 825 if (sin6->sin6_port == 0) { 826 error = EADDRNOTAVAIL; 827 goto release; 828 } 829 830 if (!IN6_IS_ADDR_UNSPECIFIED(&inp->in6p_faddr)) { 831 /* how about ::ffff:0.0.0.0 case? */ 832 error = EISCONN; 833 goto release; 834 } 835 836 /* 837 * Given we handle the v4mapped case in the INET block above 838 * assert here that it must not happen anymore. 839 */ 840 KASSERT(!IN6_IS_ADDR_V4MAPPED(&sin6->sin6_addr), 841 ("%s: sin6(%p)->sin6_addr is v4mapped which we " 842 "should have handled.", __func__, sin6)); 843 844 /* This only requires read-locking. */ 845 error = in6_selectsrc_socket(sin6, optp, inp, 846 td->td_ucred, scope_ambiguous, &in6a, NULL); 847 if (error) 848 goto release; 849 laddr = &in6a; 850 851 if (inp->inp_lport == 0) { 852 struct inpcbinfo *pcbinfo; 853 854 INP_WLOCK_ASSERT(inp); 855 856 pcbinfo = udp_get_inpcbinfo(so->so_proto->pr_protocol); 857 INP_HASH_WLOCK(pcbinfo); 858 error = in6_pcbsetport(laddr, inp, td->td_ucred); 859 INP_HASH_WUNLOCK(pcbinfo); 860 if (error != 0) { 861 /* Undo an address bind that may have occurred. */ 862 inp->in6p_laddr = in6addr_any; 863 goto release; 864 } 865 } 866 faddr = &sin6->sin6_addr; 867 fport = sin6->sin6_port; /* allow 0 port */ 868 869 } else { 870 if (IN6_IS_ADDR_UNSPECIFIED(&inp->in6p_faddr)) { 871 error = ENOTCONN; 872 goto release; 873 } 874 laddr = &inp->in6p_laddr; 875 faddr = &inp->in6p_faddr; 876 fport = inp->inp_fport; 877 } 878 879 ulen = m->m_pkthdr.len; 880 plen = sizeof(struct udphdr) + ulen; 881 hlen = sizeof(struct ip6_hdr); 882 883 /* 884 * Calculate data length and get a mbuf 885 * for UDP and IP6 headers. 886 */ 887 M_PREPEND(m, hlen + sizeof(struct udphdr), M_NOWAIT); 888 if (m == NULL) { 889 error = ENOBUFS; 890 goto release; 891 } 892 893 /* 894 * Stuff checksum and output datagram. 895 */ 896 cscov = cscov_partial = 0; 897 udp6 = (struct udphdr *)(mtod(m, caddr_t) + hlen); 898 udp6->uh_sport = inp->inp_lport; /* lport is always set in the PCB */ 899 udp6->uh_dport = fport; 900 if (nxt == IPPROTO_UDPLITE) { 901 struct udpcb *up; 902 903 up = intoudpcb(inp); 904 cscov = up->u_txcslen; 905 if (cscov >= plen) 906 cscov = 0; 907 udp6->uh_ulen = htons(cscov); 908 /* 909 * For UDP-Lite, checksum coverage length of zero means 910 * the entire UDPLite packet is covered by the checksum. 911 */ 912 cscov_partial = (cscov == 0) ? 0 : 1; 913 } else if (plen <= 0xffff) 914 udp6->uh_ulen = htons((u_short)plen); 915 else 916 udp6->uh_ulen = 0; 917 udp6->uh_sum = 0; 918 919 ip6 = mtod(m, struct ip6_hdr *); 920 ip6->ip6_flow = inp->inp_flow & IPV6_FLOWINFO_MASK; 921 ip6->ip6_vfc &= ~IPV6_VERSION_MASK; 922 ip6->ip6_vfc |= IPV6_VERSION; 923 ip6->ip6_plen = htons((u_short)plen); 924 ip6->ip6_nxt = nxt; 925 ip6->ip6_hlim = in6_selecthlim(inp, NULL); 926 ip6->ip6_src = *laddr; 927 ip6->ip6_dst = *faddr; 928 929 #ifdef MAC 930 mac_inpcb_create_mbuf(inp, m); 931 #endif 932 933 if (cscov_partial) { 934 if ((udp6->uh_sum = in6_cksum_partial(m, nxt, 935 sizeof(struct ip6_hdr), plen, cscov)) == 0) 936 udp6->uh_sum = 0xffff; 937 } else { 938 udp6->uh_sum = in6_cksum_pseudo(ip6, plen, nxt, 0); 939 m->m_pkthdr.csum_flags = CSUM_UDP_IPV6; 940 m->m_pkthdr.csum_data = offsetof(struct udphdr, uh_sum); 941 } 942 943 flags = 0; 944 #ifdef RSS 945 { 946 uint32_t hash_val, hash_type; 947 uint8_t pr; 948 949 pr = inp->inp_socket->so_proto->pr_protocol; 950 /* 951 * Calculate an appropriate RSS hash for UDP and 952 * UDP Lite. 953 * 954 * The called function will take care of figuring out 955 * whether a 2-tuple or 4-tuple hash is required based 956 * on the currently configured scheme. 957 * 958 * Later later on connected socket values should be 959 * cached in the inpcb and reused, rather than constantly 960 * re-calculating it. 961 * 962 * UDP Lite is a different protocol number and will 963 * likely end up being hashed as a 2-tuple until 964 * RSS / NICs grow UDP Lite protocol awareness. 965 */ 966 if (rss_proto_software_hash_v6(faddr, laddr, fport, 967 inp->inp_lport, pr, &hash_val, &hash_type) == 0) { 968 m->m_pkthdr.flowid = hash_val; 969 M_HASHTYPE_SET(m, hash_type); 970 } 971 972 /* 973 * Don't override with the inp cached flowid. 974 * 975 * Until the whole UDP path is vetted, it may actually 976 * be incorrect. 977 */ 978 flags |= IP_NODEFAULTFLOWID; 979 } 980 #endif 981 982 UDPSTAT_INC(udps_opackets); 983 if (nxt == IPPROTO_UDPLITE) 984 UDPLITE_PROBE(send, NULL, inp, ip6, inp, udp6); 985 else 986 UDP_PROBE(send, NULL, inp, ip6, inp, udp6); 987 error = ip6_output(m, optp, 988 INP_WLOCKED(inp) ? &inp->inp_route6 : NULL, flags, 989 inp->in6p_moptions, NULL, inp); 990 INP_UNLOCK(inp); 991 NET_EPOCH_EXIT(et); 992 993 if (control) { 994 ip6_clearpktopts(&opt, -1); 995 m_freem(control); 996 } 997 return (error); 998 999 release: 1000 INP_UNLOCK(inp); 1001 NET_EPOCH_EXIT(et); 1002 if (control) { 1003 ip6_clearpktopts(&opt, -1); 1004 m_freem(control); 1005 } 1006 m_freem(m); 1007 1008 return (error); 1009 } 1010 1011 static void 1012 udp6_abort(struct socket *so) 1013 { 1014 struct inpcb *inp; 1015 struct inpcbinfo *pcbinfo; 1016 1017 pcbinfo = udp_get_inpcbinfo(so->so_proto->pr_protocol); 1018 inp = sotoinpcb(so); 1019 KASSERT(inp != NULL, ("udp6_abort: inp == NULL")); 1020 1021 INP_WLOCK(inp); 1022 #ifdef INET 1023 if (inp->inp_vflag & INP_IPV4) { 1024 struct pr_usrreqs *pru; 1025 uint8_t nxt; 1026 1027 nxt = (inp->inp_socket->so_proto->pr_protocol == IPPROTO_UDP) ? 1028 IPPROTO_UDP : IPPROTO_UDPLITE; 1029 INP_WUNLOCK(inp); 1030 pru = inetsw[ip_protox[nxt]].pr_usrreqs; 1031 (*pru->pru_abort)(so); 1032 return; 1033 } 1034 #endif 1035 1036 if (!IN6_IS_ADDR_UNSPECIFIED(&inp->in6p_faddr)) { 1037 INP_HASH_WLOCK(pcbinfo); 1038 in6_pcbdisconnect(inp); 1039 inp->in6p_laddr = in6addr_any; 1040 INP_HASH_WUNLOCK(pcbinfo); 1041 soisdisconnected(so); 1042 } 1043 INP_WUNLOCK(inp); 1044 } 1045 1046 static int 1047 udp6_attach(struct socket *so, int proto, struct thread *td) 1048 { 1049 struct inpcb *inp; 1050 struct inpcbinfo *pcbinfo; 1051 int error; 1052 1053 pcbinfo = udp_get_inpcbinfo(so->so_proto->pr_protocol); 1054 inp = sotoinpcb(so); 1055 KASSERT(inp == NULL, ("udp6_attach: inp != NULL")); 1056 1057 if (so->so_snd.sb_hiwat == 0 || so->so_rcv.sb_hiwat == 0) { 1058 error = soreserve(so, udp_sendspace, udp_recvspace); 1059 if (error) 1060 return (error); 1061 } 1062 INP_INFO_WLOCK(pcbinfo); 1063 error = in_pcballoc(so, pcbinfo); 1064 if (error) { 1065 INP_INFO_WUNLOCK(pcbinfo); 1066 return (error); 1067 } 1068 inp = (struct inpcb *)so->so_pcb; 1069 inp->inp_vflag |= INP_IPV6; 1070 if ((inp->inp_flags & IN6P_IPV6_V6ONLY) == 0) 1071 inp->inp_vflag |= INP_IPV4; 1072 inp->in6p_hops = -1; /* use kernel default */ 1073 inp->in6p_cksum = -1; /* just to be sure */ 1074 /* 1075 * XXX: ugly!! 1076 * IPv4 TTL initialization is necessary for an IPv6 socket as well, 1077 * because the socket may be bound to an IPv6 wildcard address, 1078 * which may match an IPv4-mapped IPv6 address. 1079 */ 1080 inp->inp_ip_ttl = V_ip_defttl; 1081 1082 error = udp_newudpcb(inp); 1083 if (error) { 1084 in_pcbdetach(inp); 1085 in_pcbfree(inp); 1086 INP_INFO_WUNLOCK(pcbinfo); 1087 return (error); 1088 } 1089 INP_WUNLOCK(inp); 1090 INP_INFO_WUNLOCK(pcbinfo); 1091 return (0); 1092 } 1093 1094 static int 1095 udp6_bind(struct socket *so, struct sockaddr *nam, struct thread *td) 1096 { 1097 struct inpcb *inp; 1098 struct inpcbinfo *pcbinfo; 1099 int error; 1100 u_char vflagsav; 1101 1102 pcbinfo = udp_get_inpcbinfo(so->so_proto->pr_protocol); 1103 inp = sotoinpcb(so); 1104 KASSERT(inp != NULL, ("udp6_bind: inp == NULL")); 1105 1106 INP_WLOCK(inp); 1107 INP_HASH_WLOCK(pcbinfo); 1108 vflagsav = inp->inp_vflag; 1109 inp->inp_vflag &= ~INP_IPV4; 1110 inp->inp_vflag |= INP_IPV6; 1111 if ((inp->inp_flags & IN6P_IPV6_V6ONLY) == 0) { 1112 struct sockaddr_in6 *sin6_p; 1113 1114 sin6_p = (struct sockaddr_in6 *)nam; 1115 1116 if (IN6_IS_ADDR_UNSPECIFIED(&sin6_p->sin6_addr)) 1117 inp->inp_vflag |= INP_IPV4; 1118 #ifdef INET 1119 else if (IN6_IS_ADDR_V4MAPPED(&sin6_p->sin6_addr)) { 1120 struct sockaddr_in sin; 1121 1122 in6_sin6_2_sin(&sin, sin6_p); 1123 inp->inp_vflag |= INP_IPV4; 1124 inp->inp_vflag &= ~INP_IPV6; 1125 error = in_pcbbind(inp, (struct sockaddr *)&sin, 1126 td->td_ucred); 1127 goto out; 1128 } 1129 #endif 1130 } 1131 1132 error = in6_pcbbind(inp, nam, td->td_ucred); 1133 #ifdef INET 1134 out: 1135 #endif 1136 if (error != 0) 1137 inp->inp_vflag = vflagsav; 1138 INP_HASH_WUNLOCK(pcbinfo); 1139 INP_WUNLOCK(inp); 1140 return (error); 1141 } 1142 1143 static void 1144 udp6_close(struct socket *so) 1145 { 1146 struct inpcb *inp; 1147 struct inpcbinfo *pcbinfo; 1148 1149 pcbinfo = udp_get_inpcbinfo(so->so_proto->pr_protocol); 1150 inp = sotoinpcb(so); 1151 KASSERT(inp != NULL, ("udp6_close: inp == NULL")); 1152 1153 INP_WLOCK(inp); 1154 #ifdef INET 1155 if (inp->inp_vflag & INP_IPV4) { 1156 struct pr_usrreqs *pru; 1157 uint8_t nxt; 1158 1159 nxt = (inp->inp_socket->so_proto->pr_protocol == IPPROTO_UDP) ? 1160 IPPROTO_UDP : IPPROTO_UDPLITE; 1161 INP_WUNLOCK(inp); 1162 pru = inetsw[ip_protox[nxt]].pr_usrreqs; 1163 (*pru->pru_disconnect)(so); 1164 return; 1165 } 1166 #endif 1167 if (!IN6_IS_ADDR_UNSPECIFIED(&inp->in6p_faddr)) { 1168 INP_HASH_WLOCK(pcbinfo); 1169 in6_pcbdisconnect(inp); 1170 inp->in6p_laddr = in6addr_any; 1171 INP_HASH_WUNLOCK(pcbinfo); 1172 soisdisconnected(so); 1173 } 1174 INP_WUNLOCK(inp); 1175 } 1176 1177 static int 1178 udp6_connect(struct socket *so, struct sockaddr *nam, struct thread *td) 1179 { 1180 struct inpcb *inp; 1181 struct inpcbinfo *pcbinfo; 1182 struct sockaddr_in6 *sin6; 1183 int error; 1184 u_char vflagsav; 1185 1186 pcbinfo = udp_get_inpcbinfo(so->so_proto->pr_protocol); 1187 inp = sotoinpcb(so); 1188 sin6 = (struct sockaddr_in6 *)nam; 1189 KASSERT(inp != NULL, ("udp6_connect: inp == NULL")); 1190 1191 /* 1192 * XXXRW: Need to clarify locking of v4/v6 flags. 1193 */ 1194 INP_WLOCK(inp); 1195 #ifdef INET 1196 if (IN6_IS_ADDR_V4MAPPED(&sin6->sin6_addr)) { 1197 struct sockaddr_in sin; 1198 1199 if ((inp->inp_flags & IN6P_IPV6_V6ONLY) != 0) { 1200 error = EINVAL; 1201 goto out; 1202 } 1203 if ((inp->inp_vflag & INP_IPV4) == 0) { 1204 error = EAFNOSUPPORT; 1205 goto out; 1206 } 1207 if (inp->inp_faddr.s_addr != INADDR_ANY) { 1208 error = EISCONN; 1209 goto out; 1210 } 1211 in6_sin6_2_sin(&sin, sin6); 1212 error = prison_remote_ip4(td->td_ucred, &sin.sin_addr); 1213 if (error != 0) 1214 goto out; 1215 vflagsav = inp->inp_vflag; 1216 inp->inp_vflag |= INP_IPV4; 1217 inp->inp_vflag &= ~INP_IPV6; 1218 INP_HASH_WLOCK(pcbinfo); 1219 error = in_pcbconnect(inp, (struct sockaddr *)&sin, 1220 td->td_ucred); 1221 INP_HASH_WUNLOCK(pcbinfo); 1222 /* 1223 * If connect succeeds, mark socket as connected. If 1224 * connect fails and socket is unbound, reset inp_vflag 1225 * field. 1226 */ 1227 if (error == 0) 1228 soisconnected(so); 1229 else if (inp->inp_laddr.s_addr == INADDR_ANY && 1230 inp->inp_lport == 0) 1231 inp->inp_vflag = vflagsav; 1232 goto out; 1233 } else { 1234 if ((inp->inp_vflag & INP_IPV6) == 0) { 1235 error = EAFNOSUPPORT; 1236 goto out; 1237 } 1238 } 1239 #endif 1240 if (!IN6_IS_ADDR_UNSPECIFIED(&inp->in6p_faddr)) { 1241 error = EISCONN; 1242 goto out; 1243 } 1244 error = prison_remote_ip6(td->td_ucred, &sin6->sin6_addr); 1245 if (error != 0) 1246 goto out; 1247 vflagsav = inp->inp_vflag; 1248 inp->inp_vflag &= ~INP_IPV4; 1249 inp->inp_vflag |= INP_IPV6; 1250 INP_HASH_WLOCK(pcbinfo); 1251 error = in6_pcbconnect(inp, nam, td->td_ucred); 1252 INP_HASH_WUNLOCK(pcbinfo); 1253 /* 1254 * If connect succeeds, mark socket as connected. If 1255 * connect fails and socket is unbound, reset inp_vflag 1256 * field. 1257 */ 1258 if (error == 0) 1259 soisconnected(so); 1260 else if (IN6_IS_ADDR_UNSPECIFIED(&inp->in6p_laddr) && 1261 inp->inp_lport == 0) 1262 inp->inp_vflag = vflagsav; 1263 out: 1264 INP_WUNLOCK(inp); 1265 return (error); 1266 } 1267 1268 static void 1269 udp6_detach(struct socket *so) 1270 { 1271 struct inpcb *inp; 1272 struct inpcbinfo *pcbinfo; 1273 struct udpcb *up; 1274 1275 pcbinfo = udp_get_inpcbinfo(so->so_proto->pr_protocol); 1276 inp = sotoinpcb(so); 1277 KASSERT(inp != NULL, ("udp6_detach: inp == NULL")); 1278 1279 INP_INFO_WLOCK(pcbinfo); 1280 INP_WLOCK(inp); 1281 up = intoudpcb(inp); 1282 KASSERT(up != NULL, ("%s: up == NULL", __func__)); 1283 in_pcbdetach(inp); 1284 in_pcbfree(inp); 1285 INP_INFO_WUNLOCK(pcbinfo); 1286 udp_discardcb(up); 1287 } 1288 1289 static int 1290 udp6_disconnect(struct socket *so) 1291 { 1292 struct inpcb *inp; 1293 struct inpcbinfo *pcbinfo; 1294 1295 pcbinfo = udp_get_inpcbinfo(so->so_proto->pr_protocol); 1296 inp = sotoinpcb(so); 1297 KASSERT(inp != NULL, ("udp6_disconnect: inp == NULL")); 1298 1299 INP_WLOCK(inp); 1300 #ifdef INET 1301 if (inp->inp_vflag & INP_IPV4) { 1302 struct pr_usrreqs *pru; 1303 uint8_t nxt; 1304 1305 nxt = (inp->inp_socket->so_proto->pr_protocol == IPPROTO_UDP) ? 1306 IPPROTO_UDP : IPPROTO_UDPLITE; 1307 INP_WUNLOCK(inp); 1308 pru = inetsw[ip_protox[nxt]].pr_usrreqs; 1309 (void)(*pru->pru_disconnect)(so); 1310 return (0); 1311 } 1312 #endif 1313 1314 if (IN6_IS_ADDR_UNSPECIFIED(&inp->in6p_faddr)) { 1315 INP_WUNLOCK(inp); 1316 return (ENOTCONN); 1317 } 1318 1319 INP_HASH_WLOCK(pcbinfo); 1320 in6_pcbdisconnect(inp); 1321 inp->in6p_laddr = in6addr_any; 1322 INP_HASH_WUNLOCK(pcbinfo); 1323 SOCK_LOCK(so); 1324 so->so_state &= ~SS_ISCONNECTED; /* XXX */ 1325 SOCK_UNLOCK(so); 1326 INP_WUNLOCK(inp); 1327 return (0); 1328 } 1329 1330 static int 1331 udp6_send(struct socket *so, int flags, struct mbuf *m, 1332 struct sockaddr *addr, struct mbuf *control, struct thread *td) 1333 { 1334 int error; 1335 1336 if (addr) { 1337 if (addr->sa_len != sizeof(struct sockaddr_in6)) { 1338 error = EINVAL; 1339 goto bad; 1340 } 1341 if (addr->sa_family != AF_INET6) { 1342 error = EAFNOSUPPORT; 1343 goto bad; 1344 } 1345 } 1346 1347 return (udp6_output(so, flags, m, addr, control, td)); 1348 1349 bad: 1350 if (control) 1351 m_freem(control); 1352 m_freem(m); 1353 return (error); 1354 } 1355 1356 struct pr_usrreqs udp6_usrreqs = { 1357 .pru_abort = udp6_abort, 1358 .pru_attach = udp6_attach, 1359 .pru_bind = udp6_bind, 1360 .pru_connect = udp6_connect, 1361 .pru_control = in6_control, 1362 .pru_detach = udp6_detach, 1363 .pru_disconnect = udp6_disconnect, 1364 .pru_peeraddr = in6_mapped_peeraddr, 1365 .pru_send = udp6_send, 1366 .pru_shutdown = udp_shutdown, 1367 .pru_sockaddr = in6_mapped_sockaddr, 1368 .pru_soreceive = soreceive_dgram, 1369 .pru_sosend = sosend_dgram, 1370 .pru_sosetlabel = in_pcbsosetlabel, 1371 .pru_close = udp6_close 1372 }; 1373