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 #ifndef PULLDOWN_TEST 227 IP6_EXTHDR_CHECK(m, off, sizeof(struct udphdr), IPPROTO_DONE); 228 ip6 = mtod(m, struct ip6_hdr *); 229 uh = (struct udphdr *)((caddr_t)ip6 + off); 230 #else 231 IP6_EXTHDR_GET(uh, struct udphdr *, m, off, sizeof(*uh)); 232 if (!uh) 233 return (IPPROTO_DONE); 234 ip6 = mtod(m, struct ip6_hdr *); 235 #endif 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 return (IPPROTO_DONE); 399 } 400 INP_RUNLOCK(last); 401 } 402 } 403 last = inp; 404 /* 405 * Don't look for additional matches if this one does 406 * not have either the SO_REUSEPORT or SO_REUSEADDR 407 * socket options set. This heuristic avoids 408 * searching through all pcbs in the common case of a 409 * non-shared port. It assumes that an application 410 * will never clear these options after setting them. 411 */ 412 if ((last->inp_socket->so_options & 413 (SO_REUSEPORT|SO_REUSEPORT_LB|SO_REUSEADDR)) == 0) 414 break; 415 } 416 417 if (last == NULL) { 418 /* 419 * No matching pcb found; discard datagram. (No need 420 * to send an ICMP Port Unreachable for a broadcast 421 * or multicast datgram.) 422 */ 423 UDPSTAT_INC(udps_noport); 424 UDPSTAT_INC(udps_noportmcast); 425 goto badunlocked; 426 } 427 INP_RLOCK(last); 428 if (__predict_true(last->inp_flags2 & INP_FREED) == 0) { 429 if (nxt == IPPROTO_UDPLITE) 430 UDPLITE_PROBE(receive, NULL, last, ip6, last, uh); 431 else 432 UDP_PROBE(receive, NULL, last, ip6, last, uh); 433 if (udp6_append(last, m, off, fromsa) == 0) 434 INP_RUNLOCK(last); 435 } else 436 INP_RUNLOCK(last); 437 return (IPPROTO_DONE); 438 } 439 /* 440 * Locate pcb for datagram. 441 */ 442 443 /* 444 * Grab info from PACKET_TAG_IPFORWARD tag prepended to the chain. 445 */ 446 if ((m->m_flags & M_IP6_NEXTHOP) && 447 (fwd_tag = m_tag_find(m, PACKET_TAG_IPFORWARD, NULL)) != NULL) { 448 struct sockaddr_in6 *next_hop6; 449 450 next_hop6 = (struct sockaddr_in6 *)(fwd_tag + 1); 451 452 /* 453 * Transparently forwarded. Pretend to be the destination. 454 * Already got one like this? 455 */ 456 inp = in6_pcblookup_mbuf(pcbinfo, &ip6->ip6_src, 457 uh->uh_sport, &ip6->ip6_dst, uh->uh_dport, 458 INPLOOKUP_RLOCKPCB, m->m_pkthdr.rcvif, m); 459 if (!inp) { 460 /* 461 * It's new. Try to find the ambushing socket. 462 * Because we've rewritten the destination address, 463 * any hardware-generated hash is ignored. 464 */ 465 inp = in6_pcblookup(pcbinfo, &ip6->ip6_src, 466 uh->uh_sport, &next_hop6->sin6_addr, 467 next_hop6->sin6_port ? htons(next_hop6->sin6_port) : 468 uh->uh_dport, INPLOOKUP_WILDCARD | 469 INPLOOKUP_RLOCKPCB, m->m_pkthdr.rcvif); 470 } 471 /* Remove the tag from the packet. We don't need it anymore. */ 472 m_tag_delete(m, fwd_tag); 473 m->m_flags &= ~M_IP6_NEXTHOP; 474 } else 475 inp = in6_pcblookup_mbuf(pcbinfo, &ip6->ip6_src, 476 uh->uh_sport, &ip6->ip6_dst, uh->uh_dport, 477 INPLOOKUP_WILDCARD | INPLOOKUP_RLOCKPCB, 478 m->m_pkthdr.rcvif, m); 479 if (inp == NULL) { 480 if (udp_log_in_vain) { 481 char ip6bufs[INET6_ADDRSTRLEN]; 482 char ip6bufd[INET6_ADDRSTRLEN]; 483 484 log(LOG_INFO, 485 "Connection attempt to UDP [%s]:%d from [%s]:%d\n", 486 ip6_sprintf(ip6bufd, &ip6->ip6_dst), 487 ntohs(uh->uh_dport), 488 ip6_sprintf(ip6bufs, &ip6->ip6_src), 489 ntohs(uh->uh_sport)); 490 } 491 if (nxt == IPPROTO_UDPLITE) 492 UDPLITE_PROBE(receive, NULL, NULL, ip6, NULL, uh); 493 else 494 UDP_PROBE(receive, NULL, NULL, ip6, NULL, uh); 495 UDPSTAT_INC(udps_noport); 496 if (m->m_flags & M_MCAST) { 497 printf("UDP6: M_MCAST is set in a unicast packet.\n"); 498 UDPSTAT_INC(udps_noportmcast); 499 goto badunlocked; 500 } 501 if (V_udp_blackhole) 502 goto badunlocked; 503 icmp6_error(m, ICMP6_DST_UNREACH, ICMP6_DST_UNREACH_NOPORT, 0); 504 return (IPPROTO_DONE); 505 } 506 INP_RLOCK_ASSERT(inp); 507 up = intoudpcb(inp); 508 if (cscov_partial) { 509 if (up->u_rxcslen == 0 || up->u_rxcslen > ulen) { 510 INP_RUNLOCK(inp); 511 m_freem(m); 512 return (IPPROTO_DONE); 513 } 514 } 515 if (nxt == IPPROTO_UDPLITE) 516 UDPLITE_PROBE(receive, NULL, inp, ip6, inp, uh); 517 else 518 UDP_PROBE(receive, NULL, inp, ip6, inp, uh); 519 if (udp6_append(inp, m, off, fromsa) == 0) 520 INP_RUNLOCK(inp); 521 return (IPPROTO_DONE); 522 523 badunlocked: 524 if (m) 525 m_freem(m); 526 return (IPPROTO_DONE); 527 } 528 529 static void 530 udp6_common_ctlinput(int cmd, struct sockaddr *sa, void *d, 531 struct inpcbinfo *pcbinfo) 532 { 533 struct udphdr uh; 534 struct ip6_hdr *ip6; 535 struct mbuf *m; 536 int off = 0; 537 struct ip6ctlparam *ip6cp = NULL; 538 const struct sockaddr_in6 *sa6_src = NULL; 539 void *cmdarg; 540 struct inpcb *(*notify)(struct inpcb *, int) = udp_notify; 541 struct udp_portonly { 542 u_int16_t uh_sport; 543 u_int16_t uh_dport; 544 } *uhp; 545 546 if (sa->sa_family != AF_INET6 || 547 sa->sa_len != sizeof(struct sockaddr_in6)) 548 return; 549 550 if ((unsigned)cmd >= PRC_NCMDS) 551 return; 552 if (PRC_IS_REDIRECT(cmd)) 553 notify = in6_rtchange, d = NULL; 554 else if (cmd == PRC_HOSTDEAD) 555 d = NULL; 556 else if (inet6ctlerrmap[cmd] == 0) 557 return; 558 559 /* if the parameter is from icmp6, decode it. */ 560 if (d != NULL) { 561 ip6cp = (struct ip6ctlparam *)d; 562 m = ip6cp->ip6c_m; 563 ip6 = ip6cp->ip6c_ip6; 564 off = ip6cp->ip6c_off; 565 cmdarg = ip6cp->ip6c_cmdarg; 566 sa6_src = ip6cp->ip6c_src; 567 } else { 568 m = NULL; 569 ip6 = NULL; 570 cmdarg = NULL; 571 sa6_src = &sa6_any; 572 } 573 574 if (ip6) { 575 /* 576 * XXX: We assume that when IPV6 is non NULL, 577 * M and OFF are valid. 578 */ 579 580 /* Check if we can safely examine src and dst ports. */ 581 if (m->m_pkthdr.len < off + sizeof(*uhp)) 582 return; 583 584 bzero(&uh, sizeof(uh)); 585 m_copydata(m, off, sizeof(*uhp), (caddr_t)&uh); 586 587 if (!PRC_IS_REDIRECT(cmd)) { 588 /* Check to see if its tunneled */ 589 struct inpcb *inp; 590 inp = in6_pcblookup_mbuf(pcbinfo, &ip6->ip6_dst, 591 uh.uh_dport, &ip6->ip6_src, uh.uh_sport, 592 INPLOOKUP_WILDCARD | INPLOOKUP_RLOCKPCB, 593 m->m_pkthdr.rcvif, m); 594 if (inp != NULL) { 595 struct udpcb *up; 596 597 up = intoudpcb(inp); 598 if (up->u_icmp_func) { 599 /* Yes it is. */ 600 INP_RUNLOCK(inp); 601 (*up->u_icmp_func)(cmd, (struct sockaddr *)ip6cp->ip6c_src, 602 d, up->u_tun_ctx); 603 return; 604 } else { 605 /* Can't find it. */ 606 INP_RUNLOCK(inp); 607 } 608 } 609 } 610 (void)in6_pcbnotify(pcbinfo, sa, uh.uh_dport, 611 (struct sockaddr *)ip6cp->ip6c_src, uh.uh_sport, cmd, 612 cmdarg, notify); 613 } else 614 (void)in6_pcbnotify(pcbinfo, sa, 0, 615 (const struct sockaddr *)sa6_src, 0, cmd, cmdarg, notify); 616 } 617 618 void 619 udp6_ctlinput(int cmd, struct sockaddr *sa, void *d) 620 { 621 622 return (udp6_common_ctlinput(cmd, sa, d, &V_udbinfo)); 623 } 624 625 void 626 udplite6_ctlinput(int cmd, struct sockaddr *sa, void *d) 627 { 628 629 return (udp6_common_ctlinput(cmd, sa, d, &V_ulitecbinfo)); 630 } 631 632 static int 633 udp6_getcred(SYSCTL_HANDLER_ARGS) 634 { 635 struct xucred xuc; 636 struct sockaddr_in6 addrs[2]; 637 struct epoch_tracker et; 638 struct inpcb *inp; 639 int error; 640 641 error = priv_check(req->td, PRIV_NETINET_GETCRED); 642 if (error) 643 return (error); 644 645 if (req->newlen != sizeof(addrs)) 646 return (EINVAL); 647 if (req->oldlen != sizeof(struct xucred)) 648 return (EINVAL); 649 error = SYSCTL_IN(req, addrs, sizeof(addrs)); 650 if (error) 651 return (error); 652 if ((error = sa6_embedscope(&addrs[0], V_ip6_use_defzone)) != 0 || 653 (error = sa6_embedscope(&addrs[1], V_ip6_use_defzone)) != 0) { 654 return (error); 655 } 656 NET_EPOCH_ENTER(et); 657 inp = in6_pcblookup(&V_udbinfo, &addrs[1].sin6_addr, 658 addrs[1].sin6_port, &addrs[0].sin6_addr, addrs[0].sin6_port, 659 INPLOOKUP_WILDCARD | INPLOOKUP_RLOCKPCB, NULL); 660 NET_EPOCH_EXIT(et); 661 if (inp != NULL) { 662 INP_RLOCK_ASSERT(inp); 663 if (inp->inp_socket == NULL) 664 error = ENOENT; 665 if (error == 0) 666 error = cr_canseesocket(req->td->td_ucred, 667 inp->inp_socket); 668 if (error == 0) 669 cru2x(inp->inp_cred, &xuc); 670 INP_RUNLOCK(inp); 671 } else 672 error = ENOENT; 673 if (error == 0) 674 error = SYSCTL_OUT(req, &xuc, sizeof(struct xucred)); 675 return (error); 676 } 677 678 SYSCTL_PROC(_net_inet6_udp6, OID_AUTO, getcred, CTLTYPE_OPAQUE|CTLFLAG_RW, 0, 679 0, udp6_getcred, "S,xucred", "Get the xucred of a UDP6 connection"); 680 681 static int 682 udp6_output(struct socket *so, int flags_arg, struct mbuf *m, 683 struct sockaddr *addr6, struct mbuf *control, struct thread *td) 684 { 685 struct inpcb *inp; 686 struct ip6_hdr *ip6; 687 struct udphdr *udp6; 688 struct in6_addr *laddr, *faddr, in6a; 689 struct ip6_pktopts *optp, opt; 690 struct sockaddr_in6 *sin6, tmp; 691 struct epoch_tracker et; 692 int cscov_partial, error, flags, hlen, scope_ambiguous; 693 u_int32_t ulen, plen; 694 uint16_t cscov; 695 u_short fport; 696 uint8_t nxt; 697 698 /* addr6 has been validated in udp6_send(). */ 699 sin6 = (struct sockaddr_in6 *)addr6; 700 701 /* 702 * In contrast to to IPv4 we do not validate the max. packet length 703 * here due to IPv6 Jumbograms (RFC2675). 704 */ 705 706 scope_ambiguous = 0; 707 if (sin6) { 708 /* Protect *addr6 from overwrites. */ 709 tmp = *sin6; 710 sin6 = &tmp; 711 712 /* 713 * Application should provide a proper zone ID or the use of 714 * default zone IDs should be enabled. Unfortunately, some 715 * applications do not behave as it should, so we need a 716 * workaround. Even if an appropriate ID is not determined, 717 * we'll see if we can determine the outgoing interface. If we 718 * can, determine the zone ID based on the interface below. 719 */ 720 if (sin6->sin6_scope_id == 0 && !V_ip6_use_defzone) 721 scope_ambiguous = 1; 722 if ((error = sa6_embedscope(sin6, V_ip6_use_defzone)) != 0) { 723 if (control) 724 m_freem(control); 725 m_freem(m); 726 return (error); 727 } 728 } 729 730 inp = sotoinpcb(so); 731 KASSERT(inp != NULL, ("%s: inp == NULL", __func__)); 732 /* 733 * In the following cases we want a write lock on the inp for either 734 * local operations or for possible route cache updates in the IPv6 735 * output path: 736 * - on connected sockets (sin6 is NULL) for route cache updates, 737 * - when we are not bound to an address and source port (it is 738 * in6_pcbsetport() which will require the write lock). 739 * 740 * We check the inp fields before actually locking the inp, so 741 * here exists a race, and we may WLOCK the inp and end with already 742 * bound one by other thread. This is fine. 743 */ 744 if (sin6 == NULL || (IN6_IS_ADDR_UNSPECIFIED(&inp->in6p_laddr) && 745 inp->inp_lport == 0)) 746 INP_WLOCK(inp); 747 else 748 INP_RLOCK(inp); 749 750 nxt = (inp->inp_socket->so_proto->pr_protocol == IPPROTO_UDP) ? 751 IPPROTO_UDP : IPPROTO_UDPLITE; 752 753 #ifdef INET 754 if ((inp->inp_flags & IN6P_IPV6_V6ONLY) == 0) { 755 int hasv4addr; 756 757 if (sin6 == NULL) 758 hasv4addr = (inp->inp_vflag & INP_IPV4); 759 else 760 hasv4addr = IN6_IS_ADDR_V4MAPPED(&sin6->sin6_addr) 761 ? 1 : 0; 762 if (hasv4addr) { 763 struct pr_usrreqs *pru; 764 765 /* 766 * XXXRW: We release UDP-layer locks before calling 767 * udp_send() in order to avoid recursion. However, 768 * this does mean there is a short window where inp's 769 * fields are unstable. Could this lead to a 770 * potential race in which the factors causing us to 771 * select the UDPv4 output routine are invalidated? 772 */ 773 INP_UNLOCK(inp); 774 if (sin6) 775 in6_sin6_2_sin_in_sock((struct sockaddr *)sin6); 776 pru = inetsw[ip_protox[nxt]].pr_usrreqs; 777 /* addr will just be freed in sendit(). */ 778 return ((*pru->pru_send)(so, flags_arg, m, 779 (struct sockaddr *)sin6, control, td)); 780 } 781 } else 782 #endif 783 if (sin6 && IN6_IS_ADDR_V4MAPPED(&sin6->sin6_addr)) { 784 /* 785 * Given this is either an IPv6-only socket or no INET is 786 * supported we will fail the send if the given destination 787 * address is a v4mapped address. 788 * 789 * XXXGL: do we leak m and control? 790 */ 791 INP_UNLOCK(inp); 792 return (EINVAL); 793 } 794 795 if (control) { 796 if ((error = ip6_setpktopts(control, &opt, 797 inp->in6p_outputopts, td->td_ucred, nxt)) != 0) { 798 INP_UNLOCK(inp); 799 ip6_clearpktopts(&opt, -1); 800 if (control) 801 m_freem(control); 802 m_freem(m); 803 return (error); 804 } 805 optp = &opt; 806 } else 807 optp = inp->in6p_outputopts; 808 809 NET_EPOCH_ENTER(et); 810 if (sin6) { 811 812 /* 813 * Since we saw no essential reason for calling in_pcbconnect, 814 * we get rid of such kind of logic, and call in6_selectsrc 815 * and in6_pcbsetport in order to fill in the local address 816 * and the local port. 817 */ 818 if (sin6->sin6_port == 0) { 819 error = EADDRNOTAVAIL; 820 goto release; 821 } 822 823 if (!IN6_IS_ADDR_UNSPECIFIED(&inp->in6p_faddr)) { 824 /* how about ::ffff:0.0.0.0 case? */ 825 error = EISCONN; 826 goto release; 827 } 828 829 /* 830 * Given we handle the v4mapped case in the INET block above 831 * assert here that it must not happen anymore. 832 */ 833 KASSERT(!IN6_IS_ADDR_V4MAPPED(&sin6->sin6_addr), 834 ("%s: sin6(%p)->sin6_addr is v4mapped which we " 835 "should have handled.", __func__, sin6)); 836 837 /* This only requires read-locking. */ 838 error = in6_selectsrc_socket(sin6, optp, inp, 839 td->td_ucred, scope_ambiguous, &in6a, NULL); 840 if (error) 841 goto release; 842 laddr = &in6a; 843 844 if (inp->inp_lport == 0) { 845 struct inpcbinfo *pcbinfo; 846 847 INP_WLOCK_ASSERT(inp); 848 849 pcbinfo = udp_get_inpcbinfo(so->so_proto->pr_protocol); 850 INP_HASH_WLOCK(pcbinfo); 851 error = in6_pcbsetport(laddr, inp, td->td_ucred); 852 INP_HASH_WUNLOCK(pcbinfo); 853 if (error != 0) { 854 /* Undo an address bind that may have occurred. */ 855 inp->in6p_laddr = in6addr_any; 856 goto release; 857 } 858 } 859 faddr = &sin6->sin6_addr; 860 fport = sin6->sin6_port; /* allow 0 port */ 861 862 } else { 863 if (IN6_IS_ADDR_UNSPECIFIED(&inp->in6p_faddr)) { 864 error = ENOTCONN; 865 goto release; 866 } 867 laddr = &inp->in6p_laddr; 868 faddr = &inp->in6p_faddr; 869 fport = inp->inp_fport; 870 } 871 872 ulen = m->m_pkthdr.len; 873 plen = sizeof(struct udphdr) + ulen; 874 hlen = sizeof(struct ip6_hdr); 875 876 /* 877 * Calculate data length and get a mbuf 878 * for UDP and IP6 headers. 879 */ 880 M_PREPEND(m, hlen + sizeof(struct udphdr), M_NOWAIT); 881 if (m == NULL) { 882 error = ENOBUFS; 883 goto release; 884 } 885 886 /* 887 * Stuff checksum and output datagram. 888 */ 889 cscov = cscov_partial = 0; 890 udp6 = (struct udphdr *)(mtod(m, caddr_t) + hlen); 891 udp6->uh_sport = inp->inp_lport; /* lport is always set in the PCB */ 892 udp6->uh_dport = fport; 893 if (nxt == IPPROTO_UDPLITE) { 894 struct udpcb *up; 895 896 up = intoudpcb(inp); 897 cscov = up->u_txcslen; 898 if (cscov >= plen) 899 cscov = 0; 900 udp6->uh_ulen = htons(cscov); 901 /* 902 * For UDP-Lite, checksum coverage length of zero means 903 * the entire UDPLite packet is covered by the checksum. 904 */ 905 cscov_partial = (cscov == 0) ? 0 : 1; 906 } else if (plen <= 0xffff) 907 udp6->uh_ulen = htons((u_short)plen); 908 else 909 udp6->uh_ulen = 0; 910 udp6->uh_sum = 0; 911 912 ip6 = mtod(m, struct ip6_hdr *); 913 ip6->ip6_flow = inp->inp_flow & IPV6_FLOWINFO_MASK; 914 ip6->ip6_vfc &= ~IPV6_VERSION_MASK; 915 ip6->ip6_vfc |= IPV6_VERSION; 916 ip6->ip6_plen = htons((u_short)plen); 917 ip6->ip6_nxt = nxt; 918 ip6->ip6_hlim = in6_selecthlim(inp, NULL); 919 ip6->ip6_src = *laddr; 920 ip6->ip6_dst = *faddr; 921 922 #ifdef MAC 923 mac_inpcb_create_mbuf(inp, m); 924 #endif 925 926 if (cscov_partial) { 927 if ((udp6->uh_sum = in6_cksum_partial(m, nxt, 928 sizeof(struct ip6_hdr), plen, cscov)) == 0) 929 udp6->uh_sum = 0xffff; 930 } else { 931 udp6->uh_sum = in6_cksum_pseudo(ip6, plen, nxt, 0); 932 m->m_pkthdr.csum_flags = CSUM_UDP_IPV6; 933 m->m_pkthdr.csum_data = offsetof(struct udphdr, uh_sum); 934 } 935 936 flags = 0; 937 #ifdef RSS 938 { 939 uint32_t hash_val, hash_type; 940 uint8_t pr; 941 942 pr = inp->inp_socket->so_proto->pr_protocol; 943 /* 944 * Calculate an appropriate RSS hash for UDP and 945 * UDP Lite. 946 * 947 * The called function will take care of figuring out 948 * whether a 2-tuple or 4-tuple hash is required based 949 * on the currently configured scheme. 950 * 951 * Later later on connected socket values should be 952 * cached in the inpcb and reused, rather than constantly 953 * re-calculating it. 954 * 955 * UDP Lite is a different protocol number and will 956 * likely end up being hashed as a 2-tuple until 957 * RSS / NICs grow UDP Lite protocol awareness. 958 */ 959 if (rss_proto_software_hash_v6(faddr, laddr, fport, 960 inp->inp_lport, pr, &hash_val, &hash_type) == 0) { 961 m->m_pkthdr.flowid = hash_val; 962 M_HASHTYPE_SET(m, hash_type); 963 } 964 965 /* 966 * Don't override with the inp cached flowid. 967 * 968 * Until the whole UDP path is vetted, it may actually 969 * be incorrect. 970 */ 971 flags |= IP_NODEFAULTFLOWID; 972 } 973 #endif 974 975 UDPSTAT_INC(udps_opackets); 976 if (nxt == IPPROTO_UDPLITE) 977 UDPLITE_PROBE(send, NULL, inp, ip6, inp, udp6); 978 else 979 UDP_PROBE(send, NULL, inp, ip6, inp, udp6); 980 error = ip6_output(m, optp, 981 INP_WLOCKED(inp) ? &inp->inp_route6 : NULL, flags, 982 inp->in6p_moptions, NULL, inp); 983 INP_UNLOCK(inp); 984 NET_EPOCH_EXIT(et); 985 986 if (control) { 987 ip6_clearpktopts(&opt, -1); 988 m_freem(control); 989 } 990 return (error); 991 992 release: 993 INP_UNLOCK(inp); 994 NET_EPOCH_EXIT(et); 995 if (control) { 996 ip6_clearpktopts(&opt, -1); 997 m_freem(control); 998 } 999 m_freem(m); 1000 1001 return (error); 1002 } 1003 1004 static void 1005 udp6_abort(struct socket *so) 1006 { 1007 struct inpcb *inp; 1008 struct inpcbinfo *pcbinfo; 1009 1010 pcbinfo = udp_get_inpcbinfo(so->so_proto->pr_protocol); 1011 inp = sotoinpcb(so); 1012 KASSERT(inp != NULL, ("udp6_abort: inp == NULL")); 1013 1014 INP_WLOCK(inp); 1015 #ifdef INET 1016 if (inp->inp_vflag & INP_IPV4) { 1017 struct pr_usrreqs *pru; 1018 uint8_t nxt; 1019 1020 nxt = (inp->inp_socket->so_proto->pr_protocol == IPPROTO_UDP) ? 1021 IPPROTO_UDP : IPPROTO_UDPLITE; 1022 INP_WUNLOCK(inp); 1023 pru = inetsw[ip_protox[nxt]].pr_usrreqs; 1024 (*pru->pru_abort)(so); 1025 return; 1026 } 1027 #endif 1028 1029 if (!IN6_IS_ADDR_UNSPECIFIED(&inp->in6p_faddr)) { 1030 INP_HASH_WLOCK(pcbinfo); 1031 in6_pcbdisconnect(inp); 1032 inp->in6p_laddr = in6addr_any; 1033 INP_HASH_WUNLOCK(pcbinfo); 1034 soisdisconnected(so); 1035 } 1036 INP_WUNLOCK(inp); 1037 } 1038 1039 static int 1040 udp6_attach(struct socket *so, int proto, struct thread *td) 1041 { 1042 struct inpcb *inp; 1043 struct inpcbinfo *pcbinfo; 1044 int error; 1045 1046 pcbinfo = udp_get_inpcbinfo(so->so_proto->pr_protocol); 1047 inp = sotoinpcb(so); 1048 KASSERT(inp == NULL, ("udp6_attach: inp != NULL")); 1049 1050 if (so->so_snd.sb_hiwat == 0 || so->so_rcv.sb_hiwat == 0) { 1051 error = soreserve(so, udp_sendspace, udp_recvspace); 1052 if (error) 1053 return (error); 1054 } 1055 INP_INFO_WLOCK(pcbinfo); 1056 error = in_pcballoc(so, pcbinfo); 1057 if (error) { 1058 INP_INFO_WUNLOCK(pcbinfo); 1059 return (error); 1060 } 1061 inp = (struct inpcb *)so->so_pcb; 1062 inp->inp_vflag |= INP_IPV6; 1063 if ((inp->inp_flags & IN6P_IPV6_V6ONLY) == 0) 1064 inp->inp_vflag |= INP_IPV4; 1065 inp->in6p_hops = -1; /* use kernel default */ 1066 inp->in6p_cksum = -1; /* just to be sure */ 1067 /* 1068 * XXX: ugly!! 1069 * IPv4 TTL initialization is necessary for an IPv6 socket as well, 1070 * because the socket may be bound to an IPv6 wildcard address, 1071 * which may match an IPv4-mapped IPv6 address. 1072 */ 1073 inp->inp_ip_ttl = V_ip_defttl; 1074 1075 error = udp_newudpcb(inp); 1076 if (error) { 1077 in_pcbdetach(inp); 1078 in_pcbfree(inp); 1079 INP_INFO_WUNLOCK(pcbinfo); 1080 return (error); 1081 } 1082 INP_WUNLOCK(inp); 1083 INP_INFO_WUNLOCK(pcbinfo); 1084 return (0); 1085 } 1086 1087 static int 1088 udp6_bind(struct socket *so, struct sockaddr *nam, struct thread *td) 1089 { 1090 struct inpcb *inp; 1091 struct inpcbinfo *pcbinfo; 1092 int error; 1093 u_char vflagsav; 1094 1095 pcbinfo = udp_get_inpcbinfo(so->so_proto->pr_protocol); 1096 inp = sotoinpcb(so); 1097 KASSERT(inp != NULL, ("udp6_bind: inp == NULL")); 1098 1099 INP_WLOCK(inp); 1100 INP_HASH_WLOCK(pcbinfo); 1101 vflagsav = inp->inp_vflag; 1102 inp->inp_vflag &= ~INP_IPV4; 1103 inp->inp_vflag |= INP_IPV6; 1104 if ((inp->inp_flags & IN6P_IPV6_V6ONLY) == 0) { 1105 struct sockaddr_in6 *sin6_p; 1106 1107 sin6_p = (struct sockaddr_in6 *)nam; 1108 1109 if (IN6_IS_ADDR_UNSPECIFIED(&sin6_p->sin6_addr)) 1110 inp->inp_vflag |= INP_IPV4; 1111 #ifdef INET 1112 else if (IN6_IS_ADDR_V4MAPPED(&sin6_p->sin6_addr)) { 1113 struct sockaddr_in sin; 1114 1115 in6_sin6_2_sin(&sin, sin6_p); 1116 inp->inp_vflag |= INP_IPV4; 1117 inp->inp_vflag &= ~INP_IPV6; 1118 error = in_pcbbind(inp, (struct sockaddr *)&sin, 1119 td->td_ucred); 1120 goto out; 1121 } 1122 #endif 1123 } 1124 1125 error = in6_pcbbind(inp, nam, td->td_ucred); 1126 #ifdef INET 1127 out: 1128 #endif 1129 if (error != 0) 1130 inp->inp_vflag = vflagsav; 1131 INP_HASH_WUNLOCK(pcbinfo); 1132 INP_WUNLOCK(inp); 1133 return (error); 1134 } 1135 1136 static void 1137 udp6_close(struct socket *so) 1138 { 1139 struct inpcb *inp; 1140 struct inpcbinfo *pcbinfo; 1141 1142 pcbinfo = udp_get_inpcbinfo(so->so_proto->pr_protocol); 1143 inp = sotoinpcb(so); 1144 KASSERT(inp != NULL, ("udp6_close: inp == NULL")); 1145 1146 INP_WLOCK(inp); 1147 #ifdef INET 1148 if (inp->inp_vflag & INP_IPV4) { 1149 struct pr_usrreqs *pru; 1150 uint8_t nxt; 1151 1152 nxt = (inp->inp_socket->so_proto->pr_protocol == IPPROTO_UDP) ? 1153 IPPROTO_UDP : IPPROTO_UDPLITE; 1154 INP_WUNLOCK(inp); 1155 pru = inetsw[ip_protox[nxt]].pr_usrreqs; 1156 (*pru->pru_disconnect)(so); 1157 return; 1158 } 1159 #endif 1160 if (!IN6_IS_ADDR_UNSPECIFIED(&inp->in6p_faddr)) { 1161 INP_HASH_WLOCK(pcbinfo); 1162 in6_pcbdisconnect(inp); 1163 inp->in6p_laddr = in6addr_any; 1164 INP_HASH_WUNLOCK(pcbinfo); 1165 soisdisconnected(so); 1166 } 1167 INP_WUNLOCK(inp); 1168 } 1169 1170 static int 1171 udp6_connect(struct socket *so, struct sockaddr *nam, struct thread *td) 1172 { 1173 struct inpcb *inp; 1174 struct inpcbinfo *pcbinfo; 1175 struct sockaddr_in6 *sin6; 1176 int error; 1177 u_char vflagsav; 1178 1179 pcbinfo = udp_get_inpcbinfo(so->so_proto->pr_protocol); 1180 inp = sotoinpcb(so); 1181 sin6 = (struct sockaddr_in6 *)nam; 1182 KASSERT(inp != NULL, ("udp6_connect: inp == NULL")); 1183 1184 /* 1185 * XXXRW: Need to clarify locking of v4/v6 flags. 1186 */ 1187 INP_WLOCK(inp); 1188 #ifdef INET 1189 if (IN6_IS_ADDR_V4MAPPED(&sin6->sin6_addr)) { 1190 struct sockaddr_in sin; 1191 1192 if ((inp->inp_flags & IN6P_IPV6_V6ONLY) != 0) { 1193 error = EINVAL; 1194 goto out; 1195 } 1196 if ((inp->inp_vflag & INP_IPV4) == 0) { 1197 error = EAFNOSUPPORT; 1198 goto out; 1199 } 1200 if (inp->inp_faddr.s_addr != INADDR_ANY) { 1201 error = EISCONN; 1202 goto out; 1203 } 1204 in6_sin6_2_sin(&sin, sin6); 1205 error = prison_remote_ip4(td->td_ucred, &sin.sin_addr); 1206 if (error != 0) 1207 goto out; 1208 vflagsav = inp->inp_vflag; 1209 inp->inp_vflag |= INP_IPV4; 1210 inp->inp_vflag &= ~INP_IPV6; 1211 INP_HASH_WLOCK(pcbinfo); 1212 error = in_pcbconnect(inp, (struct sockaddr *)&sin, 1213 td->td_ucred); 1214 INP_HASH_WUNLOCK(pcbinfo); 1215 /* 1216 * If connect succeeds, mark socket as connected. If 1217 * connect fails and socket is unbound, reset inp_vflag 1218 * field. 1219 */ 1220 if (error == 0) 1221 soisconnected(so); 1222 else if (inp->inp_laddr.s_addr == INADDR_ANY && 1223 inp->inp_lport == 0) 1224 inp->inp_vflag = vflagsav; 1225 goto out; 1226 } else { 1227 if ((inp->inp_vflag & INP_IPV6) == 0) { 1228 error = EAFNOSUPPORT; 1229 goto out; 1230 } 1231 } 1232 #endif 1233 if (!IN6_IS_ADDR_UNSPECIFIED(&inp->in6p_faddr)) { 1234 error = EISCONN; 1235 goto out; 1236 } 1237 error = prison_remote_ip6(td->td_ucred, &sin6->sin6_addr); 1238 if (error != 0) 1239 goto out; 1240 vflagsav = inp->inp_vflag; 1241 inp->inp_vflag &= ~INP_IPV4; 1242 inp->inp_vflag |= INP_IPV6; 1243 INP_HASH_WLOCK(pcbinfo); 1244 error = in6_pcbconnect(inp, nam, td->td_ucred); 1245 INP_HASH_WUNLOCK(pcbinfo); 1246 /* 1247 * If connect succeeds, mark socket as connected. If 1248 * connect fails and socket is unbound, reset inp_vflag 1249 * field. 1250 */ 1251 if (error == 0) 1252 soisconnected(so); 1253 else if (IN6_IS_ADDR_UNSPECIFIED(&inp->in6p_laddr) && 1254 inp->inp_lport == 0) 1255 inp->inp_vflag = vflagsav; 1256 out: 1257 INP_WUNLOCK(inp); 1258 return (error); 1259 } 1260 1261 static void 1262 udp6_detach(struct socket *so) 1263 { 1264 struct inpcb *inp; 1265 struct inpcbinfo *pcbinfo; 1266 struct udpcb *up; 1267 1268 pcbinfo = udp_get_inpcbinfo(so->so_proto->pr_protocol); 1269 inp = sotoinpcb(so); 1270 KASSERT(inp != NULL, ("udp6_detach: inp == NULL")); 1271 1272 INP_INFO_WLOCK(pcbinfo); 1273 INP_WLOCK(inp); 1274 up = intoudpcb(inp); 1275 KASSERT(up != NULL, ("%s: up == NULL", __func__)); 1276 in_pcbdetach(inp); 1277 in_pcbfree(inp); 1278 INP_INFO_WUNLOCK(pcbinfo); 1279 udp_discardcb(up); 1280 } 1281 1282 static int 1283 udp6_disconnect(struct socket *so) 1284 { 1285 struct inpcb *inp; 1286 struct inpcbinfo *pcbinfo; 1287 1288 pcbinfo = udp_get_inpcbinfo(so->so_proto->pr_protocol); 1289 inp = sotoinpcb(so); 1290 KASSERT(inp != NULL, ("udp6_disconnect: inp == NULL")); 1291 1292 INP_WLOCK(inp); 1293 #ifdef INET 1294 if (inp->inp_vflag & INP_IPV4) { 1295 struct pr_usrreqs *pru; 1296 uint8_t nxt; 1297 1298 nxt = (inp->inp_socket->so_proto->pr_protocol == IPPROTO_UDP) ? 1299 IPPROTO_UDP : IPPROTO_UDPLITE; 1300 INP_WUNLOCK(inp); 1301 pru = inetsw[ip_protox[nxt]].pr_usrreqs; 1302 (void)(*pru->pru_disconnect)(so); 1303 return (0); 1304 } 1305 #endif 1306 1307 if (IN6_IS_ADDR_UNSPECIFIED(&inp->in6p_faddr)) { 1308 INP_WUNLOCK(inp); 1309 return (ENOTCONN); 1310 } 1311 1312 INP_HASH_WLOCK(pcbinfo); 1313 in6_pcbdisconnect(inp); 1314 inp->in6p_laddr = in6addr_any; 1315 INP_HASH_WUNLOCK(pcbinfo); 1316 SOCK_LOCK(so); 1317 so->so_state &= ~SS_ISCONNECTED; /* XXX */ 1318 SOCK_UNLOCK(so); 1319 INP_WUNLOCK(inp); 1320 return (0); 1321 } 1322 1323 static int 1324 udp6_send(struct socket *so, int flags, struct mbuf *m, 1325 struct sockaddr *addr, struct mbuf *control, struct thread *td) 1326 { 1327 int error; 1328 1329 if (addr) { 1330 if (addr->sa_len != sizeof(struct sockaddr_in6)) { 1331 error = EINVAL; 1332 goto bad; 1333 } 1334 if (addr->sa_family != AF_INET6) { 1335 error = EAFNOSUPPORT; 1336 goto bad; 1337 } 1338 } 1339 1340 return (udp6_output(so, flags, m, addr, control, td)); 1341 1342 bad: 1343 if (control) 1344 m_freem(control); 1345 m_freem(m); 1346 return (error); 1347 } 1348 1349 struct pr_usrreqs udp6_usrreqs = { 1350 .pru_abort = udp6_abort, 1351 .pru_attach = udp6_attach, 1352 .pru_bind = udp6_bind, 1353 .pru_connect = udp6_connect, 1354 .pru_control = in6_control, 1355 .pru_detach = udp6_detach, 1356 .pru_disconnect = udp6_disconnect, 1357 .pru_peeraddr = in6_mapped_peeraddr, 1358 .pru_send = udp6_send, 1359 .pru_shutdown = udp_shutdown, 1360 .pru_sockaddr = in6_mapped_sockaddr, 1361 .pru_soreceive = soreceive_dgram, 1362 .pru_sosend = sosend_dgram, 1363 .pru_sosetlabel = in_pcbsosetlabel, 1364 .pru_close = udp6_close 1365 }; 1366