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 (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 if (m) 532 m_freem(m); 533 *mp = NULL; 534 return (IPPROTO_DONE); 535 } 536 537 static void 538 udp6_common_ctlinput(int cmd, struct sockaddr *sa, void *d, 539 struct inpcbinfo *pcbinfo) 540 { 541 struct udphdr uh; 542 struct ip6_hdr *ip6; 543 struct mbuf *m; 544 int off = 0; 545 struct ip6ctlparam *ip6cp = NULL; 546 const struct sockaddr_in6 *sa6_src = NULL; 547 void *cmdarg; 548 struct inpcb *(*notify)(struct inpcb *, int) = udp_notify; 549 struct udp_portonly { 550 u_int16_t uh_sport; 551 u_int16_t uh_dport; 552 } *uhp; 553 554 if (sa->sa_family != AF_INET6 || 555 sa->sa_len != sizeof(struct sockaddr_in6)) 556 return; 557 558 if ((unsigned)cmd >= PRC_NCMDS) 559 return; 560 if (PRC_IS_REDIRECT(cmd)) 561 notify = in6_rtchange, d = NULL; 562 else if (cmd == PRC_HOSTDEAD) 563 d = NULL; 564 else if (inet6ctlerrmap[cmd] == 0) 565 return; 566 567 /* if the parameter is from icmp6, decode it. */ 568 if (d != NULL) { 569 ip6cp = (struct ip6ctlparam *)d; 570 m = ip6cp->ip6c_m; 571 ip6 = ip6cp->ip6c_ip6; 572 off = ip6cp->ip6c_off; 573 cmdarg = ip6cp->ip6c_cmdarg; 574 sa6_src = ip6cp->ip6c_src; 575 } else { 576 m = NULL; 577 ip6 = NULL; 578 cmdarg = NULL; 579 sa6_src = &sa6_any; 580 } 581 582 if (ip6) { 583 /* 584 * XXX: We assume that when IPV6 is non NULL, 585 * M and OFF are valid. 586 */ 587 588 /* Check if we can safely examine src and dst ports. */ 589 if (m->m_pkthdr.len < off + sizeof(*uhp)) 590 return; 591 592 bzero(&uh, sizeof(uh)); 593 m_copydata(m, off, sizeof(*uhp), (caddr_t)&uh); 594 595 if (!PRC_IS_REDIRECT(cmd)) { 596 /* Check to see if its tunneled */ 597 struct inpcb *inp; 598 inp = in6_pcblookup_mbuf(pcbinfo, &ip6->ip6_dst, 599 uh.uh_dport, &ip6->ip6_src, uh.uh_sport, 600 INPLOOKUP_WILDCARD | INPLOOKUP_RLOCKPCB, 601 m->m_pkthdr.rcvif, m); 602 if (inp != NULL) { 603 struct udpcb *up; 604 605 up = intoudpcb(inp); 606 if (up->u_icmp_func) { 607 /* Yes it is. */ 608 INP_RUNLOCK(inp); 609 (*up->u_icmp_func)(cmd, (struct sockaddr *)ip6cp->ip6c_src, 610 d, up->u_tun_ctx); 611 return; 612 } else { 613 /* Can't find it. */ 614 INP_RUNLOCK(inp); 615 } 616 } 617 } 618 (void)in6_pcbnotify(pcbinfo, sa, uh.uh_dport, 619 (struct sockaddr *)ip6cp->ip6c_src, uh.uh_sport, cmd, 620 cmdarg, notify); 621 } else 622 (void)in6_pcbnotify(pcbinfo, sa, 0, 623 (const struct sockaddr *)sa6_src, 0, cmd, cmdarg, notify); 624 } 625 626 void 627 udp6_ctlinput(int cmd, struct sockaddr *sa, void *d) 628 { 629 630 return (udp6_common_ctlinput(cmd, sa, d, &V_udbinfo)); 631 } 632 633 void 634 udplite6_ctlinput(int cmd, struct sockaddr *sa, void *d) 635 { 636 637 return (udp6_common_ctlinput(cmd, sa, d, &V_ulitecbinfo)); 638 } 639 640 static int 641 udp6_getcred(SYSCTL_HANDLER_ARGS) 642 { 643 struct xucred xuc; 644 struct sockaddr_in6 addrs[2]; 645 struct epoch_tracker et; 646 struct inpcb *inp; 647 int error; 648 649 error = priv_check(req->td, PRIV_NETINET_GETCRED); 650 if (error) 651 return (error); 652 653 if (req->newlen != sizeof(addrs)) 654 return (EINVAL); 655 if (req->oldlen != sizeof(struct xucred)) 656 return (EINVAL); 657 error = SYSCTL_IN(req, addrs, sizeof(addrs)); 658 if (error) 659 return (error); 660 if ((error = sa6_embedscope(&addrs[0], V_ip6_use_defzone)) != 0 || 661 (error = sa6_embedscope(&addrs[1], V_ip6_use_defzone)) != 0) { 662 return (error); 663 } 664 NET_EPOCH_ENTER(et); 665 inp = in6_pcblookup(&V_udbinfo, &addrs[1].sin6_addr, 666 addrs[1].sin6_port, &addrs[0].sin6_addr, addrs[0].sin6_port, 667 INPLOOKUP_WILDCARD | INPLOOKUP_RLOCKPCB, NULL); 668 NET_EPOCH_EXIT(et); 669 if (inp != NULL) { 670 INP_RLOCK_ASSERT(inp); 671 if (inp->inp_socket == NULL) 672 error = ENOENT; 673 if (error == 0) 674 error = cr_canseesocket(req->td->td_ucred, 675 inp->inp_socket); 676 if (error == 0) 677 cru2x(inp->inp_cred, &xuc); 678 INP_RUNLOCK(inp); 679 } else 680 error = ENOENT; 681 if (error == 0) 682 error = SYSCTL_OUT(req, &xuc, sizeof(struct xucred)); 683 return (error); 684 } 685 686 SYSCTL_PROC(_net_inet6_udp6, OID_AUTO, getcred, CTLTYPE_OPAQUE|CTLFLAG_RW, 0, 687 0, udp6_getcred, "S,xucred", "Get the xucred of a UDP6 connection"); 688 689 static int 690 udp6_output(struct socket *so, int flags_arg, struct mbuf *m, 691 struct sockaddr *addr6, struct mbuf *control, struct thread *td) 692 { 693 struct inpcb *inp; 694 struct ip6_hdr *ip6; 695 struct udphdr *udp6; 696 struct in6_addr *laddr, *faddr, in6a; 697 struct ip6_pktopts *optp, opt; 698 struct sockaddr_in6 *sin6, tmp; 699 struct epoch_tracker et; 700 int cscov_partial, error, flags, hlen, scope_ambiguous; 701 u_int32_t ulen, plen; 702 uint16_t cscov; 703 u_short fport; 704 uint8_t nxt; 705 706 /* addr6 has been validated in udp6_send(). */ 707 sin6 = (struct sockaddr_in6 *)addr6; 708 709 /* 710 * In contrast to to IPv4 we do not validate the max. packet length 711 * here due to IPv6 Jumbograms (RFC2675). 712 */ 713 714 scope_ambiguous = 0; 715 if (sin6) { 716 /* Protect *addr6 from overwrites. */ 717 tmp = *sin6; 718 sin6 = &tmp; 719 720 /* 721 * Application should provide a proper zone ID or the use of 722 * default zone IDs should be enabled. Unfortunately, some 723 * applications do not behave as it should, so we need a 724 * workaround. Even if an appropriate ID is not determined, 725 * we'll see if we can determine the outgoing interface. If we 726 * can, determine the zone ID based on the interface below. 727 */ 728 if (sin6->sin6_scope_id == 0 && !V_ip6_use_defzone) 729 scope_ambiguous = 1; 730 if ((error = sa6_embedscope(sin6, V_ip6_use_defzone)) != 0) { 731 if (control) 732 m_freem(control); 733 m_freem(m); 734 return (error); 735 } 736 } 737 738 inp = sotoinpcb(so); 739 KASSERT(inp != NULL, ("%s: inp == NULL", __func__)); 740 /* 741 * In the following cases we want a write lock on the inp for either 742 * local operations or for possible route cache updates in the IPv6 743 * output path: 744 * - on connected sockets (sin6 is NULL) for route cache updates, 745 * - when we are not bound to an address and source port (it is 746 * in6_pcbsetport() which will require the write lock). 747 * 748 * We check the inp fields before actually locking the inp, so 749 * here exists a race, and we may WLOCK the inp and end with already 750 * bound one by other thread. This is fine. 751 */ 752 if (sin6 == NULL || (IN6_IS_ADDR_UNSPECIFIED(&inp->in6p_laddr) && 753 inp->inp_lport == 0)) 754 INP_WLOCK(inp); 755 else 756 INP_RLOCK(inp); 757 758 nxt = (inp->inp_socket->so_proto->pr_protocol == IPPROTO_UDP) ? 759 IPPROTO_UDP : IPPROTO_UDPLITE; 760 761 #ifdef INET 762 if ((inp->inp_flags & IN6P_IPV6_V6ONLY) == 0) { 763 int hasv4addr; 764 765 if (sin6 == NULL) 766 hasv4addr = (inp->inp_vflag & INP_IPV4); 767 else 768 hasv4addr = IN6_IS_ADDR_V4MAPPED(&sin6->sin6_addr) 769 ? 1 : 0; 770 if (hasv4addr) { 771 struct pr_usrreqs *pru; 772 773 /* 774 * XXXRW: We release UDP-layer locks before calling 775 * udp_send() in order to avoid recursion. However, 776 * this does mean there is a short window where inp's 777 * fields are unstable. Could this lead to a 778 * potential race in which the factors causing us to 779 * select the UDPv4 output routine are invalidated? 780 */ 781 INP_UNLOCK(inp); 782 if (sin6) 783 in6_sin6_2_sin_in_sock((struct sockaddr *)sin6); 784 pru = inetsw[ip_protox[nxt]].pr_usrreqs; 785 /* addr will just be freed in sendit(). */ 786 return ((*pru->pru_send)(so, flags_arg, m, 787 (struct sockaddr *)sin6, control, td)); 788 } 789 } else 790 #endif 791 if (sin6 && IN6_IS_ADDR_V4MAPPED(&sin6->sin6_addr)) { 792 /* 793 * Given this is either an IPv6-only socket or no INET is 794 * supported we will fail the send if the given destination 795 * address is a v4mapped address. 796 * 797 * XXXGL: do we leak m and control? 798 */ 799 INP_UNLOCK(inp); 800 return (EINVAL); 801 } 802 803 if (control) { 804 if ((error = ip6_setpktopts(control, &opt, 805 inp->in6p_outputopts, td->td_ucred, nxt)) != 0) { 806 INP_UNLOCK(inp); 807 ip6_clearpktopts(&opt, -1); 808 if (control) 809 m_freem(control); 810 m_freem(m); 811 return (error); 812 } 813 optp = &opt; 814 } else 815 optp = inp->in6p_outputopts; 816 817 NET_EPOCH_ENTER(et); 818 if (sin6) { 819 820 /* 821 * Since we saw no essential reason for calling in_pcbconnect, 822 * we get rid of such kind of logic, and call in6_selectsrc 823 * and in6_pcbsetport in order to fill in the local address 824 * and the local port. 825 */ 826 if (sin6->sin6_port == 0) { 827 error = EADDRNOTAVAIL; 828 goto release; 829 } 830 831 if (!IN6_IS_ADDR_UNSPECIFIED(&inp->in6p_faddr)) { 832 /* how about ::ffff:0.0.0.0 case? */ 833 error = EISCONN; 834 goto release; 835 } 836 837 /* 838 * Given we handle the v4mapped case in the INET block above 839 * assert here that it must not happen anymore. 840 */ 841 KASSERT(!IN6_IS_ADDR_V4MAPPED(&sin6->sin6_addr), 842 ("%s: sin6(%p)->sin6_addr is v4mapped which we " 843 "should have handled.", __func__, sin6)); 844 845 /* This only requires read-locking. */ 846 error = in6_selectsrc_socket(sin6, optp, inp, 847 td->td_ucred, scope_ambiguous, &in6a, NULL); 848 if (error) 849 goto release; 850 laddr = &in6a; 851 852 if (inp->inp_lport == 0) { 853 struct inpcbinfo *pcbinfo; 854 855 INP_WLOCK_ASSERT(inp); 856 857 pcbinfo = udp_get_inpcbinfo(so->so_proto->pr_protocol); 858 INP_HASH_WLOCK(pcbinfo); 859 error = in6_pcbsetport(laddr, inp, td->td_ucred); 860 INP_HASH_WUNLOCK(pcbinfo); 861 if (error != 0) { 862 /* Undo an address bind that may have occurred. */ 863 inp->in6p_laddr = in6addr_any; 864 goto release; 865 } 866 } 867 faddr = &sin6->sin6_addr; 868 fport = sin6->sin6_port; /* allow 0 port */ 869 870 } else { 871 if (IN6_IS_ADDR_UNSPECIFIED(&inp->in6p_faddr)) { 872 error = ENOTCONN; 873 goto release; 874 } 875 laddr = &inp->in6p_laddr; 876 faddr = &inp->in6p_faddr; 877 fport = inp->inp_fport; 878 } 879 880 ulen = m->m_pkthdr.len; 881 plen = sizeof(struct udphdr) + ulen; 882 hlen = sizeof(struct ip6_hdr); 883 884 /* 885 * Calculate data length and get a mbuf 886 * for UDP and IP6 headers. 887 */ 888 M_PREPEND(m, hlen + sizeof(struct udphdr), M_NOWAIT); 889 if (m == NULL) { 890 error = ENOBUFS; 891 goto release; 892 } 893 894 /* 895 * Stuff checksum and output datagram. 896 */ 897 cscov = cscov_partial = 0; 898 udp6 = (struct udphdr *)(mtod(m, caddr_t) + hlen); 899 udp6->uh_sport = inp->inp_lport; /* lport is always set in the PCB */ 900 udp6->uh_dport = fport; 901 if (nxt == IPPROTO_UDPLITE) { 902 struct udpcb *up; 903 904 up = intoudpcb(inp); 905 cscov = up->u_txcslen; 906 if (cscov >= plen) 907 cscov = 0; 908 udp6->uh_ulen = htons(cscov); 909 /* 910 * For UDP-Lite, checksum coverage length of zero means 911 * the entire UDPLite packet is covered by the checksum. 912 */ 913 cscov_partial = (cscov == 0) ? 0 : 1; 914 } else if (plen <= 0xffff) 915 udp6->uh_ulen = htons((u_short)plen); 916 else 917 udp6->uh_ulen = 0; 918 udp6->uh_sum = 0; 919 920 ip6 = mtod(m, struct ip6_hdr *); 921 ip6->ip6_flow = inp->inp_flow & IPV6_FLOWINFO_MASK; 922 ip6->ip6_vfc &= ~IPV6_VERSION_MASK; 923 ip6->ip6_vfc |= IPV6_VERSION; 924 ip6->ip6_plen = htons((u_short)plen); 925 ip6->ip6_nxt = nxt; 926 ip6->ip6_hlim = in6_selecthlim(inp, NULL); 927 ip6->ip6_src = *laddr; 928 ip6->ip6_dst = *faddr; 929 930 #ifdef MAC 931 mac_inpcb_create_mbuf(inp, m); 932 #endif 933 934 if (cscov_partial) { 935 if ((udp6->uh_sum = in6_cksum_partial(m, nxt, 936 sizeof(struct ip6_hdr), plen, cscov)) == 0) 937 udp6->uh_sum = 0xffff; 938 } else { 939 udp6->uh_sum = in6_cksum_pseudo(ip6, plen, nxt, 0); 940 m->m_pkthdr.csum_flags = CSUM_UDP_IPV6; 941 m->m_pkthdr.csum_data = offsetof(struct udphdr, uh_sum); 942 } 943 944 flags = 0; 945 #ifdef RSS 946 { 947 uint32_t hash_val, hash_type; 948 uint8_t pr; 949 950 pr = inp->inp_socket->so_proto->pr_protocol; 951 /* 952 * Calculate an appropriate RSS hash for UDP and 953 * UDP Lite. 954 * 955 * The called function will take care of figuring out 956 * whether a 2-tuple or 4-tuple hash is required based 957 * on the currently configured scheme. 958 * 959 * Later later on connected socket values should be 960 * cached in the inpcb and reused, rather than constantly 961 * re-calculating it. 962 * 963 * UDP Lite is a different protocol number and will 964 * likely end up being hashed as a 2-tuple until 965 * RSS / NICs grow UDP Lite protocol awareness. 966 */ 967 if (rss_proto_software_hash_v6(faddr, laddr, fport, 968 inp->inp_lport, pr, &hash_val, &hash_type) == 0) { 969 m->m_pkthdr.flowid = hash_val; 970 M_HASHTYPE_SET(m, hash_type); 971 } 972 973 /* 974 * Don't override with the inp cached flowid. 975 * 976 * Until the whole UDP path is vetted, it may actually 977 * be incorrect. 978 */ 979 flags |= IP_NODEFAULTFLOWID; 980 } 981 #endif 982 983 UDPSTAT_INC(udps_opackets); 984 if (nxt == IPPROTO_UDPLITE) 985 UDPLITE_PROBE(send, NULL, inp, ip6, inp, udp6); 986 else 987 UDP_PROBE(send, NULL, inp, ip6, inp, udp6); 988 error = ip6_output(m, optp, 989 INP_WLOCKED(inp) ? &inp->inp_route6 : NULL, flags, 990 inp->in6p_moptions, NULL, inp); 991 INP_UNLOCK(inp); 992 NET_EPOCH_EXIT(et); 993 994 if (control) { 995 ip6_clearpktopts(&opt, -1); 996 m_freem(control); 997 } 998 return (error); 999 1000 release: 1001 INP_UNLOCK(inp); 1002 NET_EPOCH_EXIT(et); 1003 if (control) { 1004 ip6_clearpktopts(&opt, -1); 1005 m_freem(control); 1006 } 1007 m_freem(m); 1008 1009 return (error); 1010 } 1011 1012 static void 1013 udp6_abort(struct socket *so) 1014 { 1015 struct inpcb *inp; 1016 struct inpcbinfo *pcbinfo; 1017 1018 pcbinfo = udp_get_inpcbinfo(so->so_proto->pr_protocol); 1019 inp = sotoinpcb(so); 1020 KASSERT(inp != NULL, ("udp6_abort: inp == NULL")); 1021 1022 INP_WLOCK(inp); 1023 #ifdef INET 1024 if (inp->inp_vflag & INP_IPV4) { 1025 struct pr_usrreqs *pru; 1026 uint8_t nxt; 1027 1028 nxt = (inp->inp_socket->so_proto->pr_protocol == IPPROTO_UDP) ? 1029 IPPROTO_UDP : IPPROTO_UDPLITE; 1030 INP_WUNLOCK(inp); 1031 pru = inetsw[ip_protox[nxt]].pr_usrreqs; 1032 (*pru->pru_abort)(so); 1033 return; 1034 } 1035 #endif 1036 1037 if (!IN6_IS_ADDR_UNSPECIFIED(&inp->in6p_faddr)) { 1038 INP_HASH_WLOCK(pcbinfo); 1039 in6_pcbdisconnect(inp); 1040 inp->in6p_laddr = in6addr_any; 1041 INP_HASH_WUNLOCK(pcbinfo); 1042 soisdisconnected(so); 1043 } 1044 INP_WUNLOCK(inp); 1045 } 1046 1047 static int 1048 udp6_attach(struct socket *so, int proto, struct thread *td) 1049 { 1050 struct inpcb *inp; 1051 struct inpcbinfo *pcbinfo; 1052 int error; 1053 1054 pcbinfo = udp_get_inpcbinfo(so->so_proto->pr_protocol); 1055 inp = sotoinpcb(so); 1056 KASSERT(inp == NULL, ("udp6_attach: inp != NULL")); 1057 1058 if (so->so_snd.sb_hiwat == 0 || so->so_rcv.sb_hiwat == 0) { 1059 error = soreserve(so, udp_sendspace, udp_recvspace); 1060 if (error) 1061 return (error); 1062 } 1063 INP_INFO_WLOCK(pcbinfo); 1064 error = in_pcballoc(so, pcbinfo); 1065 if (error) { 1066 INP_INFO_WUNLOCK(pcbinfo); 1067 return (error); 1068 } 1069 inp = (struct inpcb *)so->so_pcb; 1070 inp->inp_vflag |= INP_IPV6; 1071 if ((inp->inp_flags & IN6P_IPV6_V6ONLY) == 0) 1072 inp->inp_vflag |= INP_IPV4; 1073 inp->in6p_hops = -1; /* use kernel default */ 1074 inp->in6p_cksum = -1; /* just to be sure */ 1075 /* 1076 * XXX: ugly!! 1077 * IPv4 TTL initialization is necessary for an IPv6 socket as well, 1078 * because the socket may be bound to an IPv6 wildcard address, 1079 * which may match an IPv4-mapped IPv6 address. 1080 */ 1081 inp->inp_ip_ttl = V_ip_defttl; 1082 1083 error = udp_newudpcb(inp); 1084 if (error) { 1085 in_pcbdetach(inp); 1086 in_pcbfree(inp); 1087 INP_INFO_WUNLOCK(pcbinfo); 1088 return (error); 1089 } 1090 INP_WUNLOCK(inp); 1091 INP_INFO_WUNLOCK(pcbinfo); 1092 return (0); 1093 } 1094 1095 static int 1096 udp6_bind(struct socket *so, struct sockaddr *nam, struct thread *td) 1097 { 1098 struct inpcb *inp; 1099 struct inpcbinfo *pcbinfo; 1100 int error; 1101 u_char vflagsav; 1102 1103 pcbinfo = udp_get_inpcbinfo(so->so_proto->pr_protocol); 1104 inp = sotoinpcb(so); 1105 KASSERT(inp != NULL, ("udp6_bind: inp == NULL")); 1106 1107 INP_WLOCK(inp); 1108 INP_HASH_WLOCK(pcbinfo); 1109 vflagsav = inp->inp_vflag; 1110 inp->inp_vflag &= ~INP_IPV4; 1111 inp->inp_vflag |= INP_IPV6; 1112 if ((inp->inp_flags & IN6P_IPV6_V6ONLY) == 0) { 1113 struct sockaddr_in6 *sin6_p; 1114 1115 sin6_p = (struct sockaddr_in6 *)nam; 1116 1117 if (IN6_IS_ADDR_UNSPECIFIED(&sin6_p->sin6_addr)) 1118 inp->inp_vflag |= INP_IPV4; 1119 #ifdef INET 1120 else if (IN6_IS_ADDR_V4MAPPED(&sin6_p->sin6_addr)) { 1121 struct sockaddr_in sin; 1122 1123 in6_sin6_2_sin(&sin, sin6_p); 1124 inp->inp_vflag |= INP_IPV4; 1125 inp->inp_vflag &= ~INP_IPV6; 1126 error = in_pcbbind(inp, (struct sockaddr *)&sin, 1127 td->td_ucred); 1128 goto out; 1129 } 1130 #endif 1131 } 1132 1133 error = in6_pcbbind(inp, nam, td->td_ucred); 1134 #ifdef INET 1135 out: 1136 #endif 1137 if (error != 0) 1138 inp->inp_vflag = vflagsav; 1139 INP_HASH_WUNLOCK(pcbinfo); 1140 INP_WUNLOCK(inp); 1141 return (error); 1142 } 1143 1144 static void 1145 udp6_close(struct socket *so) 1146 { 1147 struct inpcb *inp; 1148 struct inpcbinfo *pcbinfo; 1149 1150 pcbinfo = udp_get_inpcbinfo(so->so_proto->pr_protocol); 1151 inp = sotoinpcb(so); 1152 KASSERT(inp != NULL, ("udp6_close: inp == NULL")); 1153 1154 INP_WLOCK(inp); 1155 #ifdef INET 1156 if (inp->inp_vflag & INP_IPV4) { 1157 struct pr_usrreqs *pru; 1158 uint8_t nxt; 1159 1160 nxt = (inp->inp_socket->so_proto->pr_protocol == IPPROTO_UDP) ? 1161 IPPROTO_UDP : IPPROTO_UDPLITE; 1162 INP_WUNLOCK(inp); 1163 pru = inetsw[ip_protox[nxt]].pr_usrreqs; 1164 (*pru->pru_disconnect)(so); 1165 return; 1166 } 1167 #endif 1168 if (!IN6_IS_ADDR_UNSPECIFIED(&inp->in6p_faddr)) { 1169 INP_HASH_WLOCK(pcbinfo); 1170 in6_pcbdisconnect(inp); 1171 inp->in6p_laddr = in6addr_any; 1172 INP_HASH_WUNLOCK(pcbinfo); 1173 soisdisconnected(so); 1174 } 1175 INP_WUNLOCK(inp); 1176 } 1177 1178 static int 1179 udp6_connect(struct socket *so, struct sockaddr *nam, struct thread *td) 1180 { 1181 struct inpcb *inp; 1182 struct inpcbinfo *pcbinfo; 1183 struct sockaddr_in6 *sin6; 1184 int error; 1185 u_char vflagsav; 1186 1187 pcbinfo = udp_get_inpcbinfo(so->so_proto->pr_protocol); 1188 inp = sotoinpcb(so); 1189 sin6 = (struct sockaddr_in6 *)nam; 1190 KASSERT(inp != NULL, ("udp6_connect: inp == NULL")); 1191 1192 /* 1193 * XXXRW: Need to clarify locking of v4/v6 flags. 1194 */ 1195 INP_WLOCK(inp); 1196 #ifdef INET 1197 if (IN6_IS_ADDR_V4MAPPED(&sin6->sin6_addr)) { 1198 struct sockaddr_in sin; 1199 1200 if ((inp->inp_flags & IN6P_IPV6_V6ONLY) != 0) { 1201 error = EINVAL; 1202 goto out; 1203 } 1204 if ((inp->inp_vflag & INP_IPV4) == 0) { 1205 error = EAFNOSUPPORT; 1206 goto out; 1207 } 1208 if (inp->inp_faddr.s_addr != INADDR_ANY) { 1209 error = EISCONN; 1210 goto out; 1211 } 1212 in6_sin6_2_sin(&sin, sin6); 1213 error = prison_remote_ip4(td->td_ucred, &sin.sin_addr); 1214 if (error != 0) 1215 goto out; 1216 vflagsav = inp->inp_vflag; 1217 inp->inp_vflag |= INP_IPV4; 1218 inp->inp_vflag &= ~INP_IPV6; 1219 INP_HASH_WLOCK(pcbinfo); 1220 error = in_pcbconnect(inp, (struct sockaddr *)&sin, 1221 td->td_ucred); 1222 INP_HASH_WUNLOCK(pcbinfo); 1223 /* 1224 * If connect succeeds, mark socket as connected. If 1225 * connect fails and socket is unbound, reset inp_vflag 1226 * field. 1227 */ 1228 if (error == 0) 1229 soisconnected(so); 1230 else if (inp->inp_laddr.s_addr == INADDR_ANY && 1231 inp->inp_lport == 0) 1232 inp->inp_vflag = vflagsav; 1233 goto out; 1234 } else { 1235 if ((inp->inp_vflag & INP_IPV6) == 0) { 1236 error = EAFNOSUPPORT; 1237 goto out; 1238 } 1239 } 1240 #endif 1241 if (!IN6_IS_ADDR_UNSPECIFIED(&inp->in6p_faddr)) { 1242 error = EISCONN; 1243 goto out; 1244 } 1245 error = prison_remote_ip6(td->td_ucred, &sin6->sin6_addr); 1246 if (error != 0) 1247 goto out; 1248 vflagsav = inp->inp_vflag; 1249 inp->inp_vflag &= ~INP_IPV4; 1250 inp->inp_vflag |= INP_IPV6; 1251 INP_HASH_WLOCK(pcbinfo); 1252 error = in6_pcbconnect(inp, nam, td->td_ucred); 1253 INP_HASH_WUNLOCK(pcbinfo); 1254 /* 1255 * If connect succeeds, mark socket as connected. If 1256 * connect fails and socket is unbound, reset inp_vflag 1257 * field. 1258 */ 1259 if (error == 0) 1260 soisconnected(so); 1261 else if (IN6_IS_ADDR_UNSPECIFIED(&inp->in6p_laddr) && 1262 inp->inp_lport == 0) 1263 inp->inp_vflag = vflagsav; 1264 out: 1265 INP_WUNLOCK(inp); 1266 return (error); 1267 } 1268 1269 static void 1270 udp6_detach(struct socket *so) 1271 { 1272 struct inpcb *inp; 1273 struct inpcbinfo *pcbinfo; 1274 struct udpcb *up; 1275 1276 pcbinfo = udp_get_inpcbinfo(so->so_proto->pr_protocol); 1277 inp = sotoinpcb(so); 1278 KASSERT(inp != NULL, ("udp6_detach: inp == NULL")); 1279 1280 INP_INFO_WLOCK(pcbinfo); 1281 INP_WLOCK(inp); 1282 up = intoudpcb(inp); 1283 KASSERT(up != NULL, ("%s: up == NULL", __func__)); 1284 in_pcbdetach(inp); 1285 in_pcbfree(inp); 1286 INP_INFO_WUNLOCK(pcbinfo); 1287 udp_discardcb(up); 1288 } 1289 1290 static int 1291 udp6_disconnect(struct socket *so) 1292 { 1293 struct inpcb *inp; 1294 struct inpcbinfo *pcbinfo; 1295 1296 pcbinfo = udp_get_inpcbinfo(so->so_proto->pr_protocol); 1297 inp = sotoinpcb(so); 1298 KASSERT(inp != NULL, ("udp6_disconnect: inp == NULL")); 1299 1300 INP_WLOCK(inp); 1301 #ifdef INET 1302 if (inp->inp_vflag & INP_IPV4) { 1303 struct pr_usrreqs *pru; 1304 uint8_t nxt; 1305 1306 nxt = (inp->inp_socket->so_proto->pr_protocol == IPPROTO_UDP) ? 1307 IPPROTO_UDP : IPPROTO_UDPLITE; 1308 INP_WUNLOCK(inp); 1309 pru = inetsw[ip_protox[nxt]].pr_usrreqs; 1310 (void)(*pru->pru_disconnect)(so); 1311 return (0); 1312 } 1313 #endif 1314 1315 if (IN6_IS_ADDR_UNSPECIFIED(&inp->in6p_faddr)) { 1316 INP_WUNLOCK(inp); 1317 return (ENOTCONN); 1318 } 1319 1320 INP_HASH_WLOCK(pcbinfo); 1321 in6_pcbdisconnect(inp); 1322 inp->in6p_laddr = in6addr_any; 1323 INP_HASH_WUNLOCK(pcbinfo); 1324 SOCK_LOCK(so); 1325 so->so_state &= ~SS_ISCONNECTED; /* XXX */ 1326 SOCK_UNLOCK(so); 1327 INP_WUNLOCK(inp); 1328 return (0); 1329 } 1330 1331 static int 1332 udp6_send(struct socket *so, int flags, struct mbuf *m, 1333 struct sockaddr *addr, struct mbuf *control, struct thread *td) 1334 { 1335 int error; 1336 1337 if (addr) { 1338 if (addr->sa_len != sizeof(struct sockaddr_in6)) { 1339 error = EINVAL; 1340 goto bad; 1341 } 1342 if (addr->sa_family != AF_INET6) { 1343 error = EAFNOSUPPORT; 1344 goto bad; 1345 } 1346 } 1347 1348 return (udp6_output(so, flags, m, addr, control, td)); 1349 1350 bad: 1351 if (control) 1352 m_freem(control); 1353 m_freem(m); 1354 return (error); 1355 } 1356 1357 struct pr_usrreqs udp6_usrreqs = { 1358 .pru_abort = udp6_abort, 1359 .pru_attach = udp6_attach, 1360 .pru_bind = udp6_bind, 1361 .pru_connect = udp6_connect, 1362 .pru_control = in6_control, 1363 .pru_detach = udp6_detach, 1364 .pru_disconnect = udp6_disconnect, 1365 .pru_peeraddr = in6_mapped_peeraddr, 1366 .pru_send = udp6_send, 1367 .pru_shutdown = udp_shutdown, 1368 .pru_sockaddr = in6_mapped_sockaddr, 1369 .pru_soreceive = soreceive_dgram, 1370 .pru_sosend = sosend_dgram, 1371 .pru_sosetlabel = in_pcbsosetlabel, 1372 .pru_close = udp6_close 1373 }; 1374