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, 686 CTLTYPE_OPAQUE | CTLFLAG_RW | CTLFLAG_MPSAFE, 687 0, 0, udp6_getcred, "S,xucred", 688 "Get the xucred of a UDP6 connection"); 689 690 static int 691 udp6_output(struct socket *so, int flags_arg, struct mbuf *m, 692 struct sockaddr *addr6, struct mbuf *control, struct thread *td) 693 { 694 struct inpcb *inp; 695 struct ip6_hdr *ip6; 696 struct udphdr *udp6; 697 struct in6_addr *laddr, *faddr, in6a; 698 struct ip6_pktopts *optp, opt; 699 struct sockaddr_in6 *sin6, tmp; 700 struct epoch_tracker et; 701 int cscov_partial, error, flags, hlen, scope_ambiguous; 702 u_int32_t ulen, plen; 703 uint16_t cscov; 704 u_short fport; 705 uint8_t nxt; 706 707 /* addr6 has been validated in udp6_send(). */ 708 sin6 = (struct sockaddr_in6 *)addr6; 709 710 /* 711 * In contrast to to IPv4 we do not validate the max. packet length 712 * here due to IPv6 Jumbograms (RFC2675). 713 */ 714 715 scope_ambiguous = 0; 716 if (sin6) { 717 /* Protect *addr6 from overwrites. */ 718 tmp = *sin6; 719 sin6 = &tmp; 720 721 /* 722 * Application should provide a proper zone ID or the use of 723 * default zone IDs should be enabled. Unfortunately, some 724 * applications do not behave as it should, so we need a 725 * workaround. Even if an appropriate ID is not determined, 726 * we'll see if we can determine the outgoing interface. If we 727 * can, determine the zone ID based on the interface below. 728 */ 729 if (sin6->sin6_scope_id == 0 && !V_ip6_use_defzone) 730 scope_ambiguous = 1; 731 if ((error = sa6_embedscope(sin6, V_ip6_use_defzone)) != 0) { 732 if (control) 733 m_freem(control); 734 m_freem(m); 735 return (error); 736 } 737 } 738 739 inp = sotoinpcb(so); 740 KASSERT(inp != NULL, ("%s: inp == NULL", __func__)); 741 /* 742 * In the following cases we want a write lock on the inp for either 743 * local operations or for possible route cache updates in the IPv6 744 * output path: 745 * - on connected sockets (sin6 is NULL) for route cache updates, 746 * - when we are not bound to an address and source port (it is 747 * in6_pcbsetport() which will require the write lock). 748 * 749 * We check the inp fields before actually locking the inp, so 750 * here exists a race, and we may WLOCK the inp and end with already 751 * bound one by other thread. This is fine. 752 */ 753 if (sin6 == NULL || (IN6_IS_ADDR_UNSPECIFIED(&inp->in6p_laddr) && 754 inp->inp_lport == 0)) 755 INP_WLOCK(inp); 756 else 757 INP_RLOCK(inp); 758 759 nxt = (inp->inp_socket->so_proto->pr_protocol == IPPROTO_UDP) ? 760 IPPROTO_UDP : IPPROTO_UDPLITE; 761 762 #ifdef INET 763 if ((inp->inp_flags & IN6P_IPV6_V6ONLY) == 0) { 764 int hasv4addr; 765 766 if (sin6 == NULL) 767 hasv4addr = (inp->inp_vflag & INP_IPV4); 768 else 769 hasv4addr = IN6_IS_ADDR_V4MAPPED(&sin6->sin6_addr) 770 ? 1 : 0; 771 if (hasv4addr) { 772 struct pr_usrreqs *pru; 773 774 /* 775 * XXXRW: We release UDP-layer locks before calling 776 * udp_send() in order to avoid recursion. However, 777 * this does mean there is a short window where inp's 778 * fields are unstable. Could this lead to a 779 * potential race in which the factors causing us to 780 * select the UDPv4 output routine are invalidated? 781 */ 782 INP_UNLOCK(inp); 783 if (sin6) 784 in6_sin6_2_sin_in_sock((struct sockaddr *)sin6); 785 pru = inetsw[ip_protox[nxt]].pr_usrreqs; 786 /* addr will just be freed in sendit(). */ 787 return ((*pru->pru_send)(so, flags_arg | PRUS_IPV6, m, 788 (struct sockaddr *)sin6, control, td)); 789 } 790 } else 791 #endif 792 if (sin6 && IN6_IS_ADDR_V4MAPPED(&sin6->sin6_addr)) { 793 /* 794 * Given this is either an IPv6-only socket or no INET is 795 * supported we will fail the send if the given destination 796 * address is a v4mapped address. 797 * 798 * XXXGL: do we leak m and control? 799 */ 800 INP_UNLOCK(inp); 801 return (EINVAL); 802 } 803 804 if (control) { 805 if ((error = ip6_setpktopts(control, &opt, 806 inp->in6p_outputopts, td->td_ucred, nxt)) != 0) { 807 INP_UNLOCK(inp); 808 ip6_clearpktopts(&opt, -1); 809 if (control) 810 m_freem(control); 811 m_freem(m); 812 return (error); 813 } 814 optp = &opt; 815 } else 816 optp = inp->in6p_outputopts; 817 818 NET_EPOCH_ENTER(et); 819 if (sin6) { 820 821 /* 822 * Since we saw no essential reason for calling in_pcbconnect, 823 * we get rid of such kind of logic, and call in6_selectsrc 824 * and in6_pcbsetport in order to fill in the local address 825 * and the local port. 826 */ 827 if (sin6->sin6_port == 0) { 828 error = EADDRNOTAVAIL; 829 goto release; 830 } 831 832 if (!IN6_IS_ADDR_UNSPECIFIED(&inp->in6p_faddr)) { 833 /* how about ::ffff:0.0.0.0 case? */ 834 error = EISCONN; 835 goto release; 836 } 837 838 /* 839 * Given we handle the v4mapped case in the INET block above 840 * assert here that it must not happen anymore. 841 */ 842 KASSERT(!IN6_IS_ADDR_V4MAPPED(&sin6->sin6_addr), 843 ("%s: sin6(%p)->sin6_addr is v4mapped which we " 844 "should have handled.", __func__, sin6)); 845 846 /* This only requires read-locking. */ 847 error = in6_selectsrc_socket(sin6, optp, inp, 848 td->td_ucred, scope_ambiguous, &in6a, NULL); 849 if (error) 850 goto release; 851 laddr = &in6a; 852 853 if (inp->inp_lport == 0) { 854 struct inpcbinfo *pcbinfo; 855 856 INP_WLOCK_ASSERT(inp); 857 858 pcbinfo = udp_get_inpcbinfo(so->so_proto->pr_protocol); 859 INP_HASH_WLOCK(pcbinfo); 860 error = in6_pcbsetport(laddr, inp, td->td_ucred); 861 INP_HASH_WUNLOCK(pcbinfo); 862 if (error != 0) { 863 /* Undo an address bind that may have occurred. */ 864 inp->in6p_laddr = in6addr_any; 865 goto release; 866 } 867 } 868 faddr = &sin6->sin6_addr; 869 fport = sin6->sin6_port; /* allow 0 port */ 870 871 } else { 872 if (IN6_IS_ADDR_UNSPECIFIED(&inp->in6p_faddr)) { 873 error = ENOTCONN; 874 goto release; 875 } 876 laddr = &inp->in6p_laddr; 877 faddr = &inp->in6p_faddr; 878 fport = inp->inp_fport; 879 } 880 881 ulen = m->m_pkthdr.len; 882 plen = sizeof(struct udphdr) + ulen; 883 hlen = sizeof(struct ip6_hdr); 884 885 /* 886 * Calculate data length and get a mbuf 887 * for UDP and IP6 headers. 888 */ 889 M_PREPEND(m, hlen + sizeof(struct udphdr), M_NOWAIT); 890 if (m == NULL) { 891 error = ENOBUFS; 892 goto release; 893 } 894 895 /* 896 * Stuff checksum and output datagram. 897 */ 898 cscov = cscov_partial = 0; 899 udp6 = (struct udphdr *)(mtod(m, caddr_t) + hlen); 900 udp6->uh_sport = inp->inp_lport; /* lport is always set in the PCB */ 901 udp6->uh_dport = fport; 902 if (nxt == IPPROTO_UDPLITE) { 903 struct udpcb *up; 904 905 up = intoudpcb(inp); 906 cscov = up->u_txcslen; 907 if (cscov >= plen) 908 cscov = 0; 909 udp6->uh_ulen = htons(cscov); 910 /* 911 * For UDP-Lite, checksum coverage length of zero means 912 * the entire UDPLite packet is covered by the checksum. 913 */ 914 cscov_partial = (cscov == 0) ? 0 : 1; 915 } else if (plen <= 0xffff) 916 udp6->uh_ulen = htons((u_short)plen); 917 else 918 udp6->uh_ulen = 0; 919 udp6->uh_sum = 0; 920 921 ip6 = mtod(m, struct ip6_hdr *); 922 ip6->ip6_flow = inp->inp_flow & IPV6_FLOWINFO_MASK; 923 ip6->ip6_vfc &= ~IPV6_VERSION_MASK; 924 ip6->ip6_vfc |= IPV6_VERSION; 925 ip6->ip6_plen = htons((u_short)plen); 926 ip6->ip6_nxt = nxt; 927 ip6->ip6_hlim = in6_selecthlim(inp, NULL); 928 ip6->ip6_src = *laddr; 929 ip6->ip6_dst = *faddr; 930 931 #ifdef MAC 932 mac_inpcb_create_mbuf(inp, m); 933 #endif 934 935 if (cscov_partial) { 936 if ((udp6->uh_sum = in6_cksum_partial(m, nxt, 937 sizeof(struct ip6_hdr), plen, cscov)) == 0) 938 udp6->uh_sum = 0xffff; 939 } else { 940 udp6->uh_sum = in6_cksum_pseudo(ip6, plen, nxt, 0); 941 m->m_pkthdr.csum_flags = CSUM_UDP_IPV6; 942 m->m_pkthdr.csum_data = offsetof(struct udphdr, uh_sum); 943 } 944 945 flags = 0; 946 #ifdef RSS 947 { 948 uint32_t hash_val, hash_type; 949 uint8_t pr; 950 951 pr = inp->inp_socket->so_proto->pr_protocol; 952 /* 953 * Calculate an appropriate RSS hash for UDP and 954 * UDP Lite. 955 * 956 * The called function will take care of figuring out 957 * whether a 2-tuple or 4-tuple hash is required based 958 * on the currently configured scheme. 959 * 960 * Later later on connected socket values should be 961 * cached in the inpcb and reused, rather than constantly 962 * re-calculating it. 963 * 964 * UDP Lite is a different protocol number and will 965 * likely end up being hashed as a 2-tuple until 966 * RSS / NICs grow UDP Lite protocol awareness. 967 */ 968 if (rss_proto_software_hash_v6(faddr, laddr, fport, 969 inp->inp_lport, pr, &hash_val, &hash_type) == 0) { 970 m->m_pkthdr.flowid = hash_val; 971 M_HASHTYPE_SET(m, hash_type); 972 } 973 974 /* 975 * Don't override with the inp cached flowid. 976 * 977 * Until the whole UDP path is vetted, it may actually 978 * be incorrect. 979 */ 980 flags |= IP_NODEFAULTFLOWID; 981 } 982 #endif 983 984 UDPSTAT_INC(udps_opackets); 985 if (nxt == IPPROTO_UDPLITE) 986 UDPLITE_PROBE(send, NULL, inp, ip6, inp, udp6); 987 else 988 UDP_PROBE(send, NULL, inp, ip6, inp, udp6); 989 error = ip6_output(m, optp, 990 INP_WLOCKED(inp) ? &inp->inp_route6 : NULL, flags, 991 inp->in6p_moptions, NULL, inp); 992 INP_UNLOCK(inp); 993 NET_EPOCH_EXIT(et); 994 995 if (control) { 996 ip6_clearpktopts(&opt, -1); 997 m_freem(control); 998 } 999 return (error); 1000 1001 release: 1002 INP_UNLOCK(inp); 1003 NET_EPOCH_EXIT(et); 1004 if (control) { 1005 ip6_clearpktopts(&opt, -1); 1006 m_freem(control); 1007 } 1008 m_freem(m); 1009 1010 return (error); 1011 } 1012 1013 static void 1014 udp6_abort(struct socket *so) 1015 { 1016 struct inpcb *inp; 1017 struct inpcbinfo *pcbinfo; 1018 1019 pcbinfo = udp_get_inpcbinfo(so->so_proto->pr_protocol); 1020 inp = sotoinpcb(so); 1021 KASSERT(inp != NULL, ("udp6_abort: inp == NULL")); 1022 1023 INP_WLOCK(inp); 1024 #ifdef INET 1025 if (inp->inp_vflag & INP_IPV4) { 1026 struct pr_usrreqs *pru; 1027 uint8_t nxt; 1028 1029 nxt = (inp->inp_socket->so_proto->pr_protocol == IPPROTO_UDP) ? 1030 IPPROTO_UDP : IPPROTO_UDPLITE; 1031 INP_WUNLOCK(inp); 1032 pru = inetsw[ip_protox[nxt]].pr_usrreqs; 1033 (*pru->pru_abort)(so); 1034 return; 1035 } 1036 #endif 1037 1038 if (!IN6_IS_ADDR_UNSPECIFIED(&inp->in6p_faddr)) { 1039 INP_HASH_WLOCK(pcbinfo); 1040 in6_pcbdisconnect(inp); 1041 inp->in6p_laddr = in6addr_any; 1042 INP_HASH_WUNLOCK(pcbinfo); 1043 soisdisconnected(so); 1044 } 1045 INP_WUNLOCK(inp); 1046 } 1047 1048 static int 1049 udp6_attach(struct socket *so, int proto, struct thread *td) 1050 { 1051 struct inpcb *inp; 1052 struct inpcbinfo *pcbinfo; 1053 int error; 1054 1055 pcbinfo = udp_get_inpcbinfo(so->so_proto->pr_protocol); 1056 inp = sotoinpcb(so); 1057 KASSERT(inp == NULL, ("udp6_attach: inp != NULL")); 1058 1059 if (so->so_snd.sb_hiwat == 0 || so->so_rcv.sb_hiwat == 0) { 1060 error = soreserve(so, udp_sendspace, udp_recvspace); 1061 if (error) 1062 return (error); 1063 } 1064 INP_INFO_WLOCK(pcbinfo); 1065 error = in_pcballoc(so, pcbinfo); 1066 if (error) { 1067 INP_INFO_WUNLOCK(pcbinfo); 1068 return (error); 1069 } 1070 inp = (struct inpcb *)so->so_pcb; 1071 inp->inp_vflag |= INP_IPV6; 1072 if ((inp->inp_flags & IN6P_IPV6_V6ONLY) == 0) 1073 inp->inp_vflag |= INP_IPV4; 1074 inp->in6p_hops = -1; /* use kernel default */ 1075 inp->in6p_cksum = -1; /* just to be sure */ 1076 /* 1077 * XXX: ugly!! 1078 * IPv4 TTL initialization is necessary for an IPv6 socket as well, 1079 * because the socket may be bound to an IPv6 wildcard address, 1080 * which may match an IPv4-mapped IPv6 address. 1081 */ 1082 inp->inp_ip_ttl = V_ip_defttl; 1083 1084 error = udp_newudpcb(inp); 1085 if (error) { 1086 in_pcbdetach(inp); 1087 in_pcbfree(inp); 1088 INP_INFO_WUNLOCK(pcbinfo); 1089 return (error); 1090 } 1091 INP_WUNLOCK(inp); 1092 INP_INFO_WUNLOCK(pcbinfo); 1093 return (0); 1094 } 1095 1096 static int 1097 udp6_bind(struct socket *so, struct sockaddr *nam, struct thread *td) 1098 { 1099 struct inpcb *inp; 1100 struct inpcbinfo *pcbinfo; 1101 int error; 1102 u_char vflagsav; 1103 1104 pcbinfo = udp_get_inpcbinfo(so->so_proto->pr_protocol); 1105 inp = sotoinpcb(so); 1106 KASSERT(inp != NULL, ("udp6_bind: inp == NULL")); 1107 1108 INP_WLOCK(inp); 1109 INP_HASH_WLOCK(pcbinfo); 1110 vflagsav = inp->inp_vflag; 1111 inp->inp_vflag &= ~INP_IPV4; 1112 inp->inp_vflag |= INP_IPV6; 1113 if ((inp->inp_flags & IN6P_IPV6_V6ONLY) == 0) { 1114 struct sockaddr_in6 *sin6_p; 1115 1116 sin6_p = (struct sockaddr_in6 *)nam; 1117 1118 if (IN6_IS_ADDR_UNSPECIFIED(&sin6_p->sin6_addr)) 1119 inp->inp_vflag |= INP_IPV4; 1120 #ifdef INET 1121 else if (IN6_IS_ADDR_V4MAPPED(&sin6_p->sin6_addr)) { 1122 struct sockaddr_in sin; 1123 1124 in6_sin6_2_sin(&sin, sin6_p); 1125 inp->inp_vflag |= INP_IPV4; 1126 inp->inp_vflag &= ~INP_IPV6; 1127 error = in_pcbbind(inp, (struct sockaddr *)&sin, 1128 td->td_ucred); 1129 goto out; 1130 } 1131 #endif 1132 } 1133 1134 error = in6_pcbbind(inp, nam, td->td_ucred); 1135 #ifdef INET 1136 out: 1137 #endif 1138 if (error != 0) 1139 inp->inp_vflag = vflagsav; 1140 INP_HASH_WUNLOCK(pcbinfo); 1141 INP_WUNLOCK(inp); 1142 return (error); 1143 } 1144 1145 static void 1146 udp6_close(struct socket *so) 1147 { 1148 struct inpcb *inp; 1149 struct inpcbinfo *pcbinfo; 1150 1151 pcbinfo = udp_get_inpcbinfo(so->so_proto->pr_protocol); 1152 inp = sotoinpcb(so); 1153 KASSERT(inp != NULL, ("udp6_close: inp == NULL")); 1154 1155 INP_WLOCK(inp); 1156 #ifdef INET 1157 if (inp->inp_vflag & INP_IPV4) { 1158 struct pr_usrreqs *pru; 1159 uint8_t nxt; 1160 1161 nxt = (inp->inp_socket->so_proto->pr_protocol == IPPROTO_UDP) ? 1162 IPPROTO_UDP : IPPROTO_UDPLITE; 1163 INP_WUNLOCK(inp); 1164 pru = inetsw[ip_protox[nxt]].pr_usrreqs; 1165 (*pru->pru_disconnect)(so); 1166 return; 1167 } 1168 #endif 1169 if (!IN6_IS_ADDR_UNSPECIFIED(&inp->in6p_faddr)) { 1170 INP_HASH_WLOCK(pcbinfo); 1171 in6_pcbdisconnect(inp); 1172 inp->in6p_laddr = in6addr_any; 1173 INP_HASH_WUNLOCK(pcbinfo); 1174 soisdisconnected(so); 1175 } 1176 INP_WUNLOCK(inp); 1177 } 1178 1179 static int 1180 udp6_connect(struct socket *so, struct sockaddr *nam, struct thread *td) 1181 { 1182 #ifdef INET 1183 struct epoch_tracker et; 1184 #endif 1185 struct inpcb *inp; 1186 struct inpcbinfo *pcbinfo; 1187 struct sockaddr_in6 *sin6; 1188 int error; 1189 u_char vflagsav; 1190 1191 pcbinfo = udp_get_inpcbinfo(so->so_proto->pr_protocol); 1192 inp = sotoinpcb(so); 1193 sin6 = (struct sockaddr_in6 *)nam; 1194 KASSERT(inp != NULL, ("udp6_connect: inp == NULL")); 1195 1196 /* 1197 * XXXRW: Need to clarify locking of v4/v6 flags. 1198 */ 1199 INP_WLOCK(inp); 1200 #ifdef INET 1201 if (IN6_IS_ADDR_V4MAPPED(&sin6->sin6_addr)) { 1202 struct sockaddr_in sin; 1203 1204 if ((inp->inp_flags & IN6P_IPV6_V6ONLY) != 0) { 1205 error = EINVAL; 1206 goto out; 1207 } 1208 if ((inp->inp_vflag & INP_IPV4) == 0) { 1209 error = EAFNOSUPPORT; 1210 goto out; 1211 } 1212 if (inp->inp_faddr.s_addr != INADDR_ANY) { 1213 error = EISCONN; 1214 goto out; 1215 } 1216 in6_sin6_2_sin(&sin, sin6); 1217 error = prison_remote_ip4(td->td_ucred, &sin.sin_addr); 1218 if (error != 0) 1219 goto out; 1220 vflagsav = inp->inp_vflag; 1221 inp->inp_vflag |= INP_IPV4; 1222 inp->inp_vflag &= ~INP_IPV6; 1223 NET_EPOCH_ENTER(et); 1224 INP_HASH_WLOCK(pcbinfo); 1225 error = in_pcbconnect(inp, (struct sockaddr *)&sin, 1226 td->td_ucred); 1227 INP_HASH_WUNLOCK(pcbinfo); 1228 NET_EPOCH_EXIT(et); 1229 /* 1230 * If connect succeeds, mark socket as connected. If 1231 * connect fails and socket is unbound, reset inp_vflag 1232 * field. 1233 */ 1234 if (error == 0) 1235 soisconnected(so); 1236 else if (inp->inp_laddr.s_addr == INADDR_ANY && 1237 inp->inp_lport == 0) 1238 inp->inp_vflag = vflagsav; 1239 goto out; 1240 } else { 1241 if ((inp->inp_vflag & INP_IPV6) == 0) { 1242 error = EAFNOSUPPORT; 1243 goto out; 1244 } 1245 } 1246 #endif 1247 if (!IN6_IS_ADDR_UNSPECIFIED(&inp->in6p_faddr)) { 1248 error = EISCONN; 1249 goto out; 1250 } 1251 error = prison_remote_ip6(td->td_ucred, &sin6->sin6_addr); 1252 if (error != 0) 1253 goto out; 1254 vflagsav = inp->inp_vflag; 1255 inp->inp_vflag &= ~INP_IPV4; 1256 inp->inp_vflag |= INP_IPV6; 1257 INP_HASH_WLOCK(pcbinfo); 1258 error = in6_pcbconnect(inp, nam, td->td_ucred); 1259 INP_HASH_WUNLOCK(pcbinfo); 1260 /* 1261 * If connect succeeds, mark socket as connected. If 1262 * connect fails and socket is unbound, reset inp_vflag 1263 * field. 1264 */ 1265 if (error == 0) 1266 soisconnected(so); 1267 else if (IN6_IS_ADDR_UNSPECIFIED(&inp->in6p_laddr) && 1268 inp->inp_lport == 0) 1269 inp->inp_vflag = vflagsav; 1270 out: 1271 INP_WUNLOCK(inp); 1272 return (error); 1273 } 1274 1275 static void 1276 udp6_detach(struct socket *so) 1277 { 1278 struct inpcb *inp; 1279 struct inpcbinfo *pcbinfo; 1280 struct udpcb *up; 1281 1282 pcbinfo = udp_get_inpcbinfo(so->so_proto->pr_protocol); 1283 inp = sotoinpcb(so); 1284 KASSERT(inp != NULL, ("udp6_detach: inp == NULL")); 1285 1286 INP_INFO_WLOCK(pcbinfo); 1287 INP_WLOCK(inp); 1288 up = intoudpcb(inp); 1289 KASSERT(up != NULL, ("%s: up == NULL", __func__)); 1290 in_pcbdetach(inp); 1291 in_pcbfree(inp); 1292 INP_INFO_WUNLOCK(pcbinfo); 1293 udp_discardcb(up); 1294 } 1295 1296 static int 1297 udp6_disconnect(struct socket *so) 1298 { 1299 struct inpcb *inp; 1300 struct inpcbinfo *pcbinfo; 1301 1302 pcbinfo = udp_get_inpcbinfo(so->so_proto->pr_protocol); 1303 inp = sotoinpcb(so); 1304 KASSERT(inp != NULL, ("udp6_disconnect: inp == NULL")); 1305 1306 INP_WLOCK(inp); 1307 #ifdef INET 1308 if (inp->inp_vflag & INP_IPV4) { 1309 struct pr_usrreqs *pru; 1310 uint8_t nxt; 1311 1312 nxt = (inp->inp_socket->so_proto->pr_protocol == IPPROTO_UDP) ? 1313 IPPROTO_UDP : IPPROTO_UDPLITE; 1314 INP_WUNLOCK(inp); 1315 pru = inetsw[ip_protox[nxt]].pr_usrreqs; 1316 (void)(*pru->pru_disconnect)(so); 1317 return (0); 1318 } 1319 #endif 1320 1321 if (IN6_IS_ADDR_UNSPECIFIED(&inp->in6p_faddr)) { 1322 INP_WUNLOCK(inp); 1323 return (ENOTCONN); 1324 } 1325 1326 INP_HASH_WLOCK(pcbinfo); 1327 in6_pcbdisconnect(inp); 1328 inp->in6p_laddr = in6addr_any; 1329 INP_HASH_WUNLOCK(pcbinfo); 1330 SOCK_LOCK(so); 1331 so->so_state &= ~SS_ISCONNECTED; /* XXX */ 1332 SOCK_UNLOCK(so); 1333 INP_WUNLOCK(inp); 1334 return (0); 1335 } 1336 1337 static int 1338 udp6_send(struct socket *so, int flags, struct mbuf *m, 1339 struct sockaddr *addr, struct mbuf *control, struct thread *td) 1340 { 1341 int error; 1342 1343 if (addr) { 1344 if (addr->sa_len != sizeof(struct sockaddr_in6)) { 1345 error = EINVAL; 1346 goto bad; 1347 } 1348 if (addr->sa_family != AF_INET6) { 1349 error = EAFNOSUPPORT; 1350 goto bad; 1351 } 1352 } 1353 1354 return (udp6_output(so, flags, m, addr, control, td)); 1355 1356 bad: 1357 if (control) 1358 m_freem(control); 1359 m_freem(m); 1360 return (error); 1361 } 1362 1363 struct pr_usrreqs udp6_usrreqs = { 1364 .pru_abort = udp6_abort, 1365 .pru_attach = udp6_attach, 1366 .pru_bind = udp6_bind, 1367 .pru_connect = udp6_connect, 1368 .pru_control = in6_control, 1369 .pru_detach = udp6_detach, 1370 .pru_disconnect = udp6_disconnect, 1371 .pru_peeraddr = in6_mapped_peeraddr, 1372 .pru_send = udp6_send, 1373 .pru_shutdown = udp_shutdown, 1374 .pru_sockaddr = in6_mapped_sockaddr, 1375 .pru_soreceive = soreceive_dgram, 1376 .pru_sosend = sosend_dgram, 1377 .pru_sosetlabel = in_pcbsosetlabel, 1378 .pru_close = udp6_close 1379 }; 1380