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 m_adj(n, off + sizeof(struct udphdr)); 188 189 so = inp->inp_socket; 190 SOCKBUF_LOCK(&so->so_rcv); 191 if (sbappendaddr_locked(&so->so_rcv, (struct sockaddr *)&fromsa[0], n, 192 opts) == 0) { 193 SOCKBUF_UNLOCK(&so->so_rcv); 194 m_freem(n); 195 if (opts) 196 m_freem(opts); 197 UDPSTAT_INC(udps_fullsock); 198 } else 199 sorwakeup_locked(so); 200 return (0); 201 } 202 203 int 204 udp6_input(struct mbuf **mp, int *offp, int proto) 205 { 206 struct mbuf *m = *mp; 207 struct ifnet *ifp; 208 struct ip6_hdr *ip6; 209 struct udphdr *uh; 210 struct inpcb *inp; 211 struct inpcbinfo *pcbinfo; 212 struct udpcb *up; 213 int off = *offp; 214 int cscov_partial; 215 int plen, ulen; 216 struct sockaddr_in6 fromsa[2]; 217 struct m_tag *fwd_tag; 218 uint16_t uh_sum; 219 uint8_t nxt; 220 221 NET_EPOCH_ASSERT(); 222 223 ifp = m->m_pkthdr.rcvif; 224 225 if (m->m_len < off + sizeof(struct udphdr)) { 226 m = m_pullup(m, off + sizeof(struct udphdr)); 227 if (m == NULL) { 228 IP6STAT_INC(ip6s_exthdrtoolong); 229 *mp = NULL; 230 return (IPPROTO_DONE); 231 } 232 } 233 ip6 = mtod(m, struct ip6_hdr *); 234 uh = (struct udphdr *)((caddr_t)ip6 + off); 235 236 UDPSTAT_INC(udps_ipackets); 237 238 /* 239 * Destination port of 0 is illegal, based on RFC768. 240 */ 241 if (uh->uh_dport == 0) 242 goto badunlocked; 243 244 plen = ntohs(ip6->ip6_plen) - off + sizeof(*ip6); 245 ulen = ntohs((u_short)uh->uh_ulen); 246 247 nxt = proto; 248 cscov_partial = (nxt == IPPROTO_UDPLITE) ? 1 : 0; 249 if (nxt == IPPROTO_UDPLITE) { 250 /* Zero means checksum over the complete packet. */ 251 if (ulen == 0) 252 ulen = plen; 253 if (ulen == plen) 254 cscov_partial = 0; 255 if ((ulen < sizeof(struct udphdr)) || (ulen > plen)) { 256 /* XXX: What is the right UDPLite MIB counter? */ 257 goto badunlocked; 258 } 259 if (uh->uh_sum == 0) { 260 /* XXX: What is the right UDPLite MIB counter? */ 261 goto badunlocked; 262 } 263 } else { 264 if ((ulen < sizeof(struct udphdr)) || (plen != ulen)) { 265 UDPSTAT_INC(udps_badlen); 266 goto badunlocked; 267 } 268 if (uh->uh_sum == 0) { 269 UDPSTAT_INC(udps_nosum); 270 goto badunlocked; 271 } 272 } 273 274 if ((m->m_pkthdr.csum_flags & CSUM_DATA_VALID_IPV6) && 275 !cscov_partial) { 276 if (m->m_pkthdr.csum_flags & CSUM_PSEUDO_HDR) 277 uh_sum = m->m_pkthdr.csum_data; 278 else 279 uh_sum = in6_cksum_pseudo(ip6, ulen, nxt, 280 m->m_pkthdr.csum_data); 281 uh_sum ^= 0xffff; 282 } else 283 uh_sum = in6_cksum_partial(m, nxt, off, plen, ulen); 284 285 if (uh_sum != 0) { 286 UDPSTAT_INC(udps_badsum); 287 goto badunlocked; 288 } 289 290 /* 291 * Construct sockaddr format source address. 292 */ 293 init_sin6(&fromsa[0], m, 0); 294 fromsa[0].sin6_port = uh->uh_sport; 295 init_sin6(&fromsa[1], m, 1); 296 fromsa[1].sin6_port = uh->uh_dport; 297 298 pcbinfo = udp_get_inpcbinfo(nxt); 299 if (IN6_IS_ADDR_MULTICAST(&ip6->ip6_dst)) { 300 struct inpcb *last; 301 struct inpcbhead *pcblist; 302 struct ip6_moptions *imo; 303 304 /* 305 * In the event that laddr should be set to the link-local 306 * address (this happens in RIPng), the multicast address 307 * specified in the received packet will not match laddr. To 308 * handle this situation, matching is relaxed if the 309 * receiving interface is the same as one specified in the 310 * socket and if the destination multicast address matches 311 * one of the multicast groups specified in the socket. 312 */ 313 314 /* 315 * KAME note: traditionally we dropped udpiphdr from mbuf 316 * here. We need udphdr for IPsec processing so we do that 317 * later. 318 */ 319 pcblist = udp_get_pcblist(nxt); 320 last = NULL; 321 CK_LIST_FOREACH(inp, pcblist, inp_list) { 322 if ((inp->inp_vflag & INP_IPV6) == 0) 323 continue; 324 if (inp->inp_lport != uh->uh_dport) 325 continue; 326 if (inp->inp_fport != 0 && 327 inp->inp_fport != uh->uh_sport) 328 continue; 329 if (!IN6_IS_ADDR_UNSPECIFIED(&inp->in6p_laddr)) { 330 if (!IN6_ARE_ADDR_EQUAL(&inp->in6p_laddr, 331 &ip6->ip6_dst)) 332 continue; 333 } 334 if (!IN6_IS_ADDR_UNSPECIFIED(&inp->in6p_faddr)) { 335 if (!IN6_ARE_ADDR_EQUAL(&inp->in6p_faddr, 336 &ip6->ip6_src) || 337 inp->inp_fport != uh->uh_sport) 338 continue; 339 } 340 341 /* 342 * XXXRW: Because we weren't holding either the inpcb 343 * or the hash lock when we checked for a match 344 * before, we should probably recheck now that the 345 * inpcb lock is (supposed to be) held. 346 */ 347 348 /* 349 * Handle socket delivery policy for any-source 350 * and source-specific multicast. [RFC3678] 351 */ 352 imo = inp->in6p_moptions; 353 if (imo && IN6_IS_ADDR_MULTICAST(&ip6->ip6_dst)) { 354 struct sockaddr_in6 mcaddr; 355 int blocked; 356 357 INP_RLOCK(inp); 358 if (__predict_false(inp->inp_flags2 & INP_FREED)) { 359 INP_RUNLOCK(inp); 360 continue; 361 } 362 363 bzero(&mcaddr, sizeof(struct sockaddr_in6)); 364 mcaddr.sin6_len = sizeof(struct sockaddr_in6); 365 mcaddr.sin6_family = AF_INET6; 366 mcaddr.sin6_addr = ip6->ip6_dst; 367 368 blocked = im6o_mc_filter(imo, ifp, 369 (struct sockaddr *)&mcaddr, 370 (struct sockaddr *)&fromsa[0]); 371 if (blocked != MCAST_PASS) { 372 if (blocked == MCAST_NOTGMEMBER) 373 IP6STAT_INC(ip6s_notmember); 374 if (blocked == MCAST_NOTSMEMBER || 375 blocked == MCAST_MUTED) 376 UDPSTAT_INC(udps_filtermcast); 377 INP_RUNLOCK(inp); /* XXX */ 378 continue; 379 } 380 381 INP_RUNLOCK(inp); 382 } 383 if (last != NULL) { 384 struct mbuf *n; 385 386 if ((n = m_copym(m, 0, M_COPYALL, M_NOWAIT)) != 387 NULL) { 388 INP_RLOCK(last); 389 if (__predict_true(last->inp_flags2 & INP_FREED) == 0) { 390 if (nxt == IPPROTO_UDPLITE) 391 UDPLITE_PROBE(receive, NULL, last, 392 ip6, last, uh); 393 else 394 UDP_PROBE(receive, NULL, last, 395 ip6, last, uh); 396 if (udp6_append(last, n, off, fromsa)) { 397 /* XXX-BZ do we leak m here? */ 398 *mp = NULL; 399 return (IPPROTO_DONE); 400 } 401 } 402 INP_RUNLOCK(last); 403 } 404 } 405 last = inp; 406 /* 407 * Don't look for additional matches if this one does 408 * not have either the SO_REUSEPORT or SO_REUSEADDR 409 * socket options set. This heuristic avoids 410 * searching through all pcbs in the common case of a 411 * non-shared port. It assumes that an application 412 * will never clear these options after setting them. 413 */ 414 if ((last->inp_socket->so_options & 415 (SO_REUSEPORT|SO_REUSEPORT_LB|SO_REUSEADDR)) == 0) 416 break; 417 } 418 419 if (last == NULL) { 420 /* 421 * No matching pcb found; discard datagram. (No need 422 * to send an ICMP Port Unreachable for a broadcast 423 * or multicast datgram.) 424 */ 425 UDPSTAT_INC(udps_noport); 426 UDPSTAT_INC(udps_noportmcast); 427 goto badunlocked; 428 } 429 INP_RLOCK(last); 430 if (__predict_true(last->inp_flags2 & INP_FREED) == 0) { 431 if (nxt == IPPROTO_UDPLITE) 432 UDPLITE_PROBE(receive, NULL, last, ip6, last, uh); 433 else 434 UDP_PROBE(receive, NULL, last, ip6, last, uh); 435 if (udp6_append(last, m, off, fromsa) == 0) 436 INP_RUNLOCK(last); 437 } else 438 INP_RUNLOCK(last); 439 *mp = NULL; 440 return (IPPROTO_DONE); 441 } 442 /* 443 * Locate pcb for datagram. 444 */ 445 446 /* 447 * Grab info from PACKET_TAG_IPFORWARD tag prepended to the chain. 448 */ 449 if ((m->m_flags & M_IP6_NEXTHOP) && 450 (fwd_tag = m_tag_find(m, PACKET_TAG_IPFORWARD, NULL)) != NULL) { 451 struct sockaddr_in6 *next_hop6; 452 453 next_hop6 = (struct sockaddr_in6 *)(fwd_tag + 1); 454 455 /* 456 * Transparently forwarded. Pretend to be the destination. 457 * Already got one like this? 458 */ 459 inp = in6_pcblookup_mbuf(pcbinfo, &ip6->ip6_src, 460 uh->uh_sport, &ip6->ip6_dst, uh->uh_dport, 461 INPLOOKUP_RLOCKPCB, m->m_pkthdr.rcvif, m); 462 if (!inp) { 463 /* 464 * It's new. Try to find the ambushing socket. 465 * Because we've rewritten the destination address, 466 * any hardware-generated hash is ignored. 467 */ 468 inp = in6_pcblookup(pcbinfo, &ip6->ip6_src, 469 uh->uh_sport, &next_hop6->sin6_addr, 470 next_hop6->sin6_port ? htons(next_hop6->sin6_port) : 471 uh->uh_dport, INPLOOKUP_WILDCARD | 472 INPLOOKUP_RLOCKPCB, m->m_pkthdr.rcvif); 473 } 474 /* Remove the tag from the packet. We don't need it anymore. */ 475 m_tag_delete(m, fwd_tag); 476 m->m_flags &= ~M_IP6_NEXTHOP; 477 } else 478 inp = in6_pcblookup_mbuf(pcbinfo, &ip6->ip6_src, 479 uh->uh_sport, &ip6->ip6_dst, uh->uh_dport, 480 INPLOOKUP_WILDCARD | INPLOOKUP_RLOCKPCB, 481 m->m_pkthdr.rcvif, m); 482 if (inp == NULL) { 483 if (V_udp_log_in_vain) { 484 char ip6bufs[INET6_ADDRSTRLEN]; 485 char ip6bufd[INET6_ADDRSTRLEN]; 486 487 log(LOG_INFO, 488 "Connection attempt to UDP [%s]:%d from [%s]:%d\n", 489 ip6_sprintf(ip6bufd, &ip6->ip6_dst), 490 ntohs(uh->uh_dport), 491 ip6_sprintf(ip6bufs, &ip6->ip6_src), 492 ntohs(uh->uh_sport)); 493 } 494 if (nxt == IPPROTO_UDPLITE) 495 UDPLITE_PROBE(receive, NULL, NULL, ip6, NULL, uh); 496 else 497 UDP_PROBE(receive, NULL, NULL, ip6, NULL, uh); 498 UDPSTAT_INC(udps_noport); 499 if (m->m_flags & M_MCAST) { 500 printf("UDP6: M_MCAST is set in a unicast packet.\n"); 501 UDPSTAT_INC(udps_noportmcast); 502 goto badunlocked; 503 } 504 if (V_udp_blackhole) 505 goto badunlocked; 506 icmp6_error(m, ICMP6_DST_UNREACH, ICMP6_DST_UNREACH_NOPORT, 0); 507 *mp = NULL; 508 return (IPPROTO_DONE); 509 } 510 INP_RLOCK_ASSERT(inp); 511 up = intoudpcb(inp); 512 if (cscov_partial) { 513 if (up->u_rxcslen == 0 || up->u_rxcslen > ulen) { 514 INP_RUNLOCK(inp); 515 m_freem(m); 516 *mp = NULL; 517 return (IPPROTO_DONE); 518 } 519 } 520 if (nxt == IPPROTO_UDPLITE) 521 UDPLITE_PROBE(receive, NULL, inp, ip6, inp, uh); 522 else 523 UDP_PROBE(receive, NULL, inp, ip6, inp, uh); 524 if (udp6_append(inp, m, off, fromsa) == 0) 525 INP_RUNLOCK(inp); 526 *mp = NULL; 527 return (IPPROTO_DONE); 528 529 badunlocked: 530 m_freem(m); 531 *mp = NULL; 532 return (IPPROTO_DONE); 533 } 534 535 static void 536 udp6_common_ctlinput(int cmd, struct sockaddr *sa, void *d, 537 struct inpcbinfo *pcbinfo) 538 { 539 struct udphdr uh; 540 struct ip6_hdr *ip6; 541 struct mbuf *m; 542 int off = 0; 543 struct ip6ctlparam *ip6cp = NULL; 544 const struct sockaddr_in6 *sa6_src = NULL; 545 void *cmdarg; 546 struct inpcb *(*notify)(struct inpcb *, int) = udp_notify; 547 struct udp_portonly { 548 u_int16_t uh_sport; 549 u_int16_t uh_dport; 550 } *uhp; 551 552 if (sa->sa_family != AF_INET6 || 553 sa->sa_len != sizeof(struct sockaddr_in6)) 554 return; 555 556 if ((unsigned)cmd >= PRC_NCMDS) 557 return; 558 if (PRC_IS_REDIRECT(cmd)) 559 notify = in6_rtchange, d = NULL; 560 else if (cmd == PRC_HOSTDEAD) 561 d = NULL; 562 else if (inet6ctlerrmap[cmd] == 0) 563 return; 564 565 /* if the parameter is from icmp6, decode it. */ 566 if (d != NULL) { 567 ip6cp = (struct ip6ctlparam *)d; 568 m = ip6cp->ip6c_m; 569 ip6 = ip6cp->ip6c_ip6; 570 off = ip6cp->ip6c_off; 571 cmdarg = ip6cp->ip6c_cmdarg; 572 sa6_src = ip6cp->ip6c_src; 573 } else { 574 m = NULL; 575 ip6 = NULL; 576 cmdarg = NULL; 577 sa6_src = &sa6_any; 578 } 579 580 if (ip6) { 581 /* 582 * XXX: We assume that when IPV6 is non NULL, 583 * M and OFF are valid. 584 */ 585 586 /* Check if we can safely examine src and dst ports. */ 587 if (m->m_pkthdr.len < off + sizeof(*uhp)) 588 return; 589 590 bzero(&uh, sizeof(uh)); 591 m_copydata(m, off, sizeof(*uhp), (caddr_t)&uh); 592 593 if (!PRC_IS_REDIRECT(cmd)) { 594 /* Check to see if its tunneled */ 595 struct inpcb *inp; 596 inp = in6_pcblookup_mbuf(pcbinfo, &ip6->ip6_dst, 597 uh.uh_dport, &ip6->ip6_src, uh.uh_sport, 598 INPLOOKUP_WILDCARD | INPLOOKUP_RLOCKPCB, 599 m->m_pkthdr.rcvif, m); 600 if (inp != NULL) { 601 struct udpcb *up; 602 603 up = intoudpcb(inp); 604 if (up->u_icmp_func) { 605 /* Yes it is. */ 606 INP_RUNLOCK(inp); 607 (*up->u_icmp_func)(cmd, (struct sockaddr *)ip6cp->ip6c_src, 608 d, up->u_tun_ctx); 609 return; 610 } else { 611 /* Can't find it. */ 612 INP_RUNLOCK(inp); 613 } 614 } 615 } 616 (void)in6_pcbnotify(pcbinfo, sa, uh.uh_dport, 617 (struct sockaddr *)ip6cp->ip6c_src, uh.uh_sport, cmd, 618 cmdarg, notify); 619 } else 620 (void)in6_pcbnotify(pcbinfo, sa, 0, 621 (const struct sockaddr *)sa6_src, 0, cmd, cmdarg, notify); 622 } 623 624 void 625 udp6_ctlinput(int cmd, struct sockaddr *sa, void *d) 626 { 627 628 return (udp6_common_ctlinput(cmd, sa, d, &V_udbinfo)); 629 } 630 631 void 632 udplite6_ctlinput(int cmd, struct sockaddr *sa, void *d) 633 { 634 635 return (udp6_common_ctlinput(cmd, sa, d, &V_ulitecbinfo)); 636 } 637 638 static int 639 udp6_getcred(SYSCTL_HANDLER_ARGS) 640 { 641 struct xucred xuc; 642 struct sockaddr_in6 addrs[2]; 643 struct epoch_tracker et; 644 struct inpcb *inp; 645 int error; 646 647 error = priv_check(req->td, PRIV_NETINET_GETCRED); 648 if (error) 649 return (error); 650 651 if (req->newlen != sizeof(addrs)) 652 return (EINVAL); 653 if (req->oldlen != sizeof(struct xucred)) 654 return (EINVAL); 655 error = SYSCTL_IN(req, addrs, sizeof(addrs)); 656 if (error) 657 return (error); 658 if ((error = sa6_embedscope(&addrs[0], V_ip6_use_defzone)) != 0 || 659 (error = sa6_embedscope(&addrs[1], V_ip6_use_defzone)) != 0) { 660 return (error); 661 } 662 NET_EPOCH_ENTER(et); 663 inp = in6_pcblookup(&V_udbinfo, &addrs[1].sin6_addr, 664 addrs[1].sin6_port, &addrs[0].sin6_addr, addrs[0].sin6_port, 665 INPLOOKUP_WILDCARD | INPLOOKUP_RLOCKPCB, NULL); 666 NET_EPOCH_EXIT(et); 667 if (inp != NULL) { 668 INP_RLOCK_ASSERT(inp); 669 if (inp->inp_socket == NULL) 670 error = ENOENT; 671 if (error == 0) 672 error = cr_canseesocket(req->td->td_ucred, 673 inp->inp_socket); 674 if (error == 0) 675 cru2x(inp->inp_cred, &xuc); 676 INP_RUNLOCK(inp); 677 } else 678 error = ENOENT; 679 if (error == 0) 680 error = SYSCTL_OUT(req, &xuc, sizeof(struct xucred)); 681 return (error); 682 } 683 684 SYSCTL_PROC(_net_inet6_udp6, OID_AUTO, getcred, 685 CTLTYPE_OPAQUE | CTLFLAG_RW | CTLFLAG_MPSAFE, 686 0, 0, udp6_getcred, "S,xucred", 687 "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 | PRUS_IPV6, 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 * 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 #ifdef INET 1181 struct epoch_tracker et; 1182 #endif 1183 struct inpcb *inp; 1184 struct inpcbinfo *pcbinfo; 1185 struct sockaddr_in6 *sin6; 1186 int error; 1187 u_char vflagsav; 1188 1189 pcbinfo = udp_get_inpcbinfo(so->so_proto->pr_protocol); 1190 inp = sotoinpcb(so); 1191 sin6 = (struct sockaddr_in6 *)nam; 1192 KASSERT(inp != NULL, ("udp6_connect: inp == NULL")); 1193 1194 /* 1195 * XXXRW: Need to clarify locking of v4/v6 flags. 1196 */ 1197 INP_WLOCK(inp); 1198 #ifdef INET 1199 if (IN6_IS_ADDR_V4MAPPED(&sin6->sin6_addr)) { 1200 struct sockaddr_in sin; 1201 1202 if ((inp->inp_flags & IN6P_IPV6_V6ONLY) != 0) { 1203 error = EINVAL; 1204 goto out; 1205 } 1206 if ((inp->inp_vflag & INP_IPV4) == 0) { 1207 error = EAFNOSUPPORT; 1208 goto out; 1209 } 1210 if (inp->inp_faddr.s_addr != INADDR_ANY) { 1211 error = EISCONN; 1212 goto out; 1213 } 1214 in6_sin6_2_sin(&sin, sin6); 1215 error = prison_remote_ip4(td->td_ucred, &sin.sin_addr); 1216 if (error != 0) 1217 goto out; 1218 vflagsav = inp->inp_vflag; 1219 inp->inp_vflag |= INP_IPV4; 1220 inp->inp_vflag &= ~INP_IPV6; 1221 NET_EPOCH_ENTER(et); 1222 INP_HASH_WLOCK(pcbinfo); 1223 error = in_pcbconnect(inp, (struct sockaddr *)&sin, 1224 td->td_ucred); 1225 INP_HASH_WUNLOCK(pcbinfo); 1226 NET_EPOCH_EXIT(et); 1227 /* 1228 * If connect succeeds, mark socket as connected. If 1229 * connect fails and socket is unbound, reset inp_vflag 1230 * field. 1231 */ 1232 if (error == 0) 1233 soisconnected(so); 1234 else if (inp->inp_laddr.s_addr == INADDR_ANY && 1235 inp->inp_lport == 0) 1236 inp->inp_vflag = vflagsav; 1237 goto out; 1238 } else { 1239 if ((inp->inp_vflag & INP_IPV6) == 0) { 1240 error = EAFNOSUPPORT; 1241 goto out; 1242 } 1243 } 1244 #endif 1245 if (!IN6_IS_ADDR_UNSPECIFIED(&inp->in6p_faddr)) { 1246 error = EISCONN; 1247 goto out; 1248 } 1249 error = prison_remote_ip6(td->td_ucred, &sin6->sin6_addr); 1250 if (error != 0) 1251 goto out; 1252 vflagsav = inp->inp_vflag; 1253 inp->inp_vflag &= ~INP_IPV4; 1254 inp->inp_vflag |= INP_IPV6; 1255 INP_HASH_WLOCK(pcbinfo); 1256 error = in6_pcbconnect(inp, nam, td->td_ucred); 1257 INP_HASH_WUNLOCK(pcbinfo); 1258 /* 1259 * If connect succeeds, mark socket as connected. If 1260 * connect fails and socket is unbound, reset inp_vflag 1261 * field. 1262 */ 1263 if (error == 0) 1264 soisconnected(so); 1265 else if (IN6_IS_ADDR_UNSPECIFIED(&inp->in6p_laddr) && 1266 inp->inp_lport == 0) 1267 inp->inp_vflag = vflagsav; 1268 out: 1269 INP_WUNLOCK(inp); 1270 return (error); 1271 } 1272 1273 static void 1274 udp6_detach(struct socket *so) 1275 { 1276 struct inpcb *inp; 1277 struct inpcbinfo *pcbinfo; 1278 struct udpcb *up; 1279 1280 pcbinfo = udp_get_inpcbinfo(so->so_proto->pr_protocol); 1281 inp = sotoinpcb(so); 1282 KASSERT(inp != NULL, ("udp6_detach: inp == NULL")); 1283 1284 INP_INFO_WLOCK(pcbinfo); 1285 INP_WLOCK(inp); 1286 up = intoudpcb(inp); 1287 KASSERT(up != NULL, ("%s: up == NULL", __func__)); 1288 in_pcbdetach(inp); 1289 in_pcbfree(inp); 1290 INP_INFO_WUNLOCK(pcbinfo); 1291 udp_discardcb(up); 1292 } 1293 1294 static int 1295 udp6_disconnect(struct socket *so) 1296 { 1297 struct inpcb *inp; 1298 struct inpcbinfo *pcbinfo; 1299 1300 pcbinfo = udp_get_inpcbinfo(so->so_proto->pr_protocol); 1301 inp = sotoinpcb(so); 1302 KASSERT(inp != NULL, ("udp6_disconnect: inp == NULL")); 1303 1304 INP_WLOCK(inp); 1305 #ifdef INET 1306 if (inp->inp_vflag & INP_IPV4) { 1307 struct pr_usrreqs *pru; 1308 uint8_t nxt; 1309 1310 nxt = (inp->inp_socket->so_proto->pr_protocol == IPPROTO_UDP) ? 1311 IPPROTO_UDP : IPPROTO_UDPLITE; 1312 INP_WUNLOCK(inp); 1313 pru = inetsw[ip_protox[nxt]].pr_usrreqs; 1314 (void)(*pru->pru_disconnect)(so); 1315 return (0); 1316 } 1317 #endif 1318 1319 if (IN6_IS_ADDR_UNSPECIFIED(&inp->in6p_faddr)) { 1320 INP_WUNLOCK(inp); 1321 return (ENOTCONN); 1322 } 1323 1324 INP_HASH_WLOCK(pcbinfo); 1325 in6_pcbdisconnect(inp); 1326 inp->in6p_laddr = in6addr_any; 1327 INP_HASH_WUNLOCK(pcbinfo); 1328 SOCK_LOCK(so); 1329 so->so_state &= ~SS_ISCONNECTED; /* XXX */ 1330 SOCK_UNLOCK(so); 1331 INP_WUNLOCK(inp); 1332 return (0); 1333 } 1334 1335 static int 1336 udp6_send(struct socket *so, int flags, struct mbuf *m, 1337 struct sockaddr *addr, struct mbuf *control, struct thread *td) 1338 { 1339 int error; 1340 1341 if (addr) { 1342 if (addr->sa_len != sizeof(struct sockaddr_in6)) { 1343 error = EINVAL; 1344 goto bad; 1345 } 1346 if (addr->sa_family != AF_INET6) { 1347 error = EAFNOSUPPORT; 1348 goto bad; 1349 } 1350 } 1351 1352 return (udp6_output(so, flags, m, addr, control, td)); 1353 1354 bad: 1355 if (control) 1356 m_freem(control); 1357 m_freem(m); 1358 return (error); 1359 } 1360 1361 struct pr_usrreqs udp6_usrreqs = { 1362 .pru_abort = udp6_abort, 1363 .pru_attach = udp6_attach, 1364 .pru_bind = udp6_bind, 1365 .pru_connect = udp6_connect, 1366 .pru_control = in6_control, 1367 .pru_detach = udp6_detach, 1368 .pru_disconnect = udp6_disconnect, 1369 .pru_peeraddr = in6_mapped_peeraddr, 1370 .pru_send = udp6_send, 1371 .pru_shutdown = udp_shutdown, 1372 .pru_sockaddr = in6_mapped_sockaddr, 1373 .pru_soreceive = soreceive_dgram, 1374 .pru_sosend = sosend_dgram, 1375 .pru_sosetlabel = in_pcbsosetlabel, 1376 .pru_close = udp6_close 1377 }; 1378