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 ifp = m->m_pkthdr.rcvif; 223 ip6 = mtod(m, struct ip6_hdr *); 224 225 #ifndef PULLDOWN_TEST 226 IP6_EXTHDR_CHECK(m, off, sizeof(struct udphdr), IPPROTO_DONE); 227 ip6 = mtod(m, struct ip6_hdr *); 228 uh = (struct udphdr *)((caddr_t)ip6 + off); 229 #else 230 IP6_EXTHDR_GET(uh, struct udphdr *, m, off, sizeof(*uh)); 231 if (!uh) 232 return (IPPROTO_DONE); 233 #endif 234 235 UDPSTAT_INC(udps_ipackets); 236 237 /* 238 * Destination port of 0 is illegal, based on RFC768. 239 */ 240 if (uh->uh_dport == 0) 241 goto badunlocked; 242 243 plen = ntohs(ip6->ip6_plen) - off + sizeof(*ip6); 244 ulen = ntohs((u_short)uh->uh_ulen); 245 246 nxt = proto; 247 cscov_partial = (nxt == IPPROTO_UDPLITE) ? 1 : 0; 248 if (nxt == IPPROTO_UDPLITE) { 249 /* Zero means checksum over the complete packet. */ 250 if (ulen == 0) 251 ulen = plen; 252 if (ulen == plen) 253 cscov_partial = 0; 254 if ((ulen < sizeof(struct udphdr)) || (ulen > plen)) { 255 /* XXX: What is the right UDPLite MIB counter? */ 256 goto badunlocked; 257 } 258 if (uh->uh_sum == 0) { 259 /* XXX: What is the right UDPLite MIB counter? */ 260 goto badunlocked; 261 } 262 } else { 263 if ((ulen < sizeof(struct udphdr)) || (plen != ulen)) { 264 UDPSTAT_INC(udps_badlen); 265 goto badunlocked; 266 } 267 if (uh->uh_sum == 0) { 268 UDPSTAT_INC(udps_nosum); 269 goto badunlocked; 270 } 271 } 272 273 if ((m->m_pkthdr.csum_flags & CSUM_DATA_VALID_IPV6) && 274 !cscov_partial) { 275 if (m->m_pkthdr.csum_flags & CSUM_PSEUDO_HDR) 276 uh_sum = m->m_pkthdr.csum_data; 277 else 278 uh_sum = in6_cksum_pseudo(ip6, ulen, nxt, 279 m->m_pkthdr.csum_data); 280 uh_sum ^= 0xffff; 281 } else 282 uh_sum = in6_cksum_partial(m, nxt, off, plen, ulen); 283 284 if (uh_sum != 0) { 285 UDPSTAT_INC(udps_badsum); 286 goto badunlocked; 287 } 288 289 /* 290 * Construct sockaddr format source address. 291 */ 292 init_sin6(&fromsa[0], m, 0); 293 fromsa[0].sin6_port = uh->uh_sport; 294 init_sin6(&fromsa[1], m, 1); 295 fromsa[1].sin6_port = uh->uh_dport; 296 297 pcbinfo = udp_get_inpcbinfo(nxt); 298 if (IN6_IS_ADDR_MULTICAST(&ip6->ip6_dst)) { 299 struct inpcb *last; 300 struct inpcbhead *pcblist; 301 struct ip6_moptions *imo; 302 303 INP_INFO_RLOCK(pcbinfo); 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 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); 358 359 bzero(&mcaddr, sizeof(struct sockaddr_in6)); 360 mcaddr.sin6_len = sizeof(struct sockaddr_in6); 361 mcaddr.sin6_family = AF_INET6; 362 mcaddr.sin6_addr = ip6->ip6_dst; 363 364 blocked = im6o_mc_filter(imo, ifp, 365 (struct sockaddr *)&mcaddr, 366 (struct sockaddr *)&fromsa[0]); 367 if (blocked != MCAST_PASS) { 368 if (blocked == MCAST_NOTGMEMBER) 369 IP6STAT_INC(ip6s_notmember); 370 if (blocked == MCAST_NOTSMEMBER || 371 blocked == MCAST_MUTED) 372 UDPSTAT_INC(udps_filtermcast); 373 INP_RUNLOCK(inp); /* XXX */ 374 continue; 375 } 376 377 INP_RUNLOCK(inp); 378 } 379 if (last != NULL) { 380 struct mbuf *n; 381 382 if ((n = m_copym(m, 0, M_COPYALL, M_NOWAIT)) != 383 NULL) { 384 INP_RLOCK(last); 385 UDP_PROBE(receive, NULL, last, ip6, 386 last, uh); 387 if (udp6_append(last, n, off, fromsa)) 388 goto inp_lost; 389 INP_RUNLOCK(last); 390 } 391 } 392 last = inp; 393 /* 394 * Don't look for additional matches if this one does 395 * not have either the SO_REUSEPORT or SO_REUSEADDR 396 * socket options set. This heuristic avoids 397 * searching through all pcbs in the common case of a 398 * non-shared port. It assumes that an application 399 * will never clear these options after setting them. 400 */ 401 if ((last->inp_socket->so_options & 402 (SO_REUSEPORT|SO_REUSEADDR)) == 0) 403 break; 404 } 405 406 if (last == NULL) { 407 /* 408 * No matching pcb found; discard datagram. (No need 409 * to send an ICMP Port Unreachable for a broadcast 410 * or multicast datgram.) 411 */ 412 UDPSTAT_INC(udps_noport); 413 UDPSTAT_INC(udps_noportmcast); 414 goto badheadlocked; 415 } 416 INP_RLOCK(last); 417 INP_INFO_RUNLOCK(pcbinfo); 418 UDP_PROBE(receive, NULL, last, ip6, last, uh); 419 if (udp6_append(last, m, off, fromsa) == 0) 420 INP_RUNLOCK(last); 421 inp_lost: 422 return (IPPROTO_DONE); 423 } 424 /* 425 * Locate pcb for datagram. 426 */ 427 428 /* 429 * Grab info from PACKET_TAG_IPFORWARD tag prepended to the chain. 430 */ 431 if ((m->m_flags & M_IP6_NEXTHOP) && 432 (fwd_tag = m_tag_find(m, PACKET_TAG_IPFORWARD, NULL)) != NULL) { 433 struct sockaddr_in6 *next_hop6; 434 435 next_hop6 = (struct sockaddr_in6 *)(fwd_tag + 1); 436 437 /* 438 * Transparently forwarded. Pretend to be the destination. 439 * Already got one like this? 440 */ 441 inp = in6_pcblookup_mbuf(pcbinfo, &ip6->ip6_src, 442 uh->uh_sport, &ip6->ip6_dst, uh->uh_dport, 443 INPLOOKUP_RLOCKPCB, m->m_pkthdr.rcvif, m); 444 if (!inp) { 445 /* 446 * It's new. Try to find the ambushing socket. 447 * Because we've rewritten the destination address, 448 * any hardware-generated hash is ignored. 449 */ 450 inp = in6_pcblookup(pcbinfo, &ip6->ip6_src, 451 uh->uh_sport, &next_hop6->sin6_addr, 452 next_hop6->sin6_port ? htons(next_hop6->sin6_port) : 453 uh->uh_dport, INPLOOKUP_WILDCARD | 454 INPLOOKUP_RLOCKPCB, m->m_pkthdr.rcvif); 455 } 456 /* Remove the tag from the packet. We don't need it anymore. */ 457 m_tag_delete(m, fwd_tag); 458 m->m_flags &= ~M_IP6_NEXTHOP; 459 } else 460 inp = in6_pcblookup_mbuf(pcbinfo, &ip6->ip6_src, 461 uh->uh_sport, &ip6->ip6_dst, uh->uh_dport, 462 INPLOOKUP_WILDCARD | INPLOOKUP_RLOCKPCB, 463 m->m_pkthdr.rcvif, m); 464 if (inp == NULL) { 465 if (udp_log_in_vain) { 466 char ip6bufs[INET6_ADDRSTRLEN]; 467 char ip6bufd[INET6_ADDRSTRLEN]; 468 469 log(LOG_INFO, 470 "Connection attempt to UDP [%s]:%d from [%s]:%d\n", 471 ip6_sprintf(ip6bufd, &ip6->ip6_dst), 472 ntohs(uh->uh_dport), 473 ip6_sprintf(ip6bufs, &ip6->ip6_src), 474 ntohs(uh->uh_sport)); 475 } 476 UDPSTAT_INC(udps_noport); 477 if (m->m_flags & M_MCAST) { 478 printf("UDP6: M_MCAST is set in a unicast packet.\n"); 479 UDPSTAT_INC(udps_noportmcast); 480 goto badunlocked; 481 } 482 if (V_udp_blackhole) 483 goto badunlocked; 484 icmp6_error(m, ICMP6_DST_UNREACH, ICMP6_DST_UNREACH_NOPORT, 0); 485 return (IPPROTO_DONE); 486 } 487 INP_RLOCK_ASSERT(inp); 488 up = intoudpcb(inp); 489 if (cscov_partial) { 490 if (up->u_rxcslen == 0 || up->u_rxcslen > ulen) { 491 INP_RUNLOCK(inp); 492 m_freem(m); 493 return (IPPROTO_DONE); 494 } 495 } 496 UDP_PROBE(receive, NULL, inp, ip6, inp, uh); 497 if (udp6_append(inp, m, off, fromsa) == 0) 498 INP_RUNLOCK(inp); 499 return (IPPROTO_DONE); 500 501 badheadlocked: 502 INP_INFO_RUNLOCK(pcbinfo); 503 badunlocked: 504 if (m) 505 m_freem(m); 506 return (IPPROTO_DONE); 507 } 508 509 static void 510 udp6_common_ctlinput(int cmd, struct sockaddr *sa, void *d, 511 struct inpcbinfo *pcbinfo) 512 { 513 struct udphdr uh; 514 struct ip6_hdr *ip6; 515 struct mbuf *m; 516 int off = 0; 517 struct ip6ctlparam *ip6cp = NULL; 518 const struct sockaddr_in6 *sa6_src = NULL; 519 void *cmdarg; 520 struct inpcb *(*notify)(struct inpcb *, int) = udp_notify; 521 struct udp_portonly { 522 u_int16_t uh_sport; 523 u_int16_t uh_dport; 524 } *uhp; 525 526 if (sa->sa_family != AF_INET6 || 527 sa->sa_len != sizeof(struct sockaddr_in6)) 528 return; 529 530 if ((unsigned)cmd >= PRC_NCMDS) 531 return; 532 if (PRC_IS_REDIRECT(cmd)) 533 notify = in6_rtchange, d = NULL; 534 else if (cmd == PRC_HOSTDEAD) 535 d = NULL; 536 else if (inet6ctlerrmap[cmd] == 0) 537 return; 538 539 /* if the parameter is from icmp6, decode it. */ 540 if (d != NULL) { 541 ip6cp = (struct ip6ctlparam *)d; 542 m = ip6cp->ip6c_m; 543 ip6 = ip6cp->ip6c_ip6; 544 off = ip6cp->ip6c_off; 545 cmdarg = ip6cp->ip6c_cmdarg; 546 sa6_src = ip6cp->ip6c_src; 547 } else { 548 m = NULL; 549 ip6 = NULL; 550 cmdarg = NULL; 551 sa6_src = &sa6_any; 552 } 553 554 if (ip6) { 555 /* 556 * XXX: We assume that when IPV6 is non NULL, 557 * M and OFF are valid. 558 */ 559 560 /* Check if we can safely examine src and dst ports. */ 561 if (m->m_pkthdr.len < off + sizeof(*uhp)) 562 return; 563 564 bzero(&uh, sizeof(uh)); 565 m_copydata(m, off, sizeof(*uhp), (caddr_t)&uh); 566 567 if (!PRC_IS_REDIRECT(cmd)) { 568 /* Check to see if its tunneled */ 569 struct inpcb *inp; 570 inp = in6_pcblookup_mbuf(pcbinfo, &ip6->ip6_dst, 571 uh.uh_dport, &ip6->ip6_src, uh.uh_sport, 572 INPLOOKUP_WILDCARD | INPLOOKUP_RLOCKPCB, 573 m->m_pkthdr.rcvif, m); 574 if (inp != NULL) { 575 struct udpcb *up; 576 577 up = intoudpcb(inp); 578 if (up->u_icmp_func) { 579 /* Yes it is. */ 580 INP_RUNLOCK(inp); 581 (*up->u_icmp_func)(cmd, (struct sockaddr *)ip6cp->ip6c_src, 582 d, up->u_tun_ctx); 583 return; 584 } else { 585 /* Can't find it. */ 586 INP_RUNLOCK(inp); 587 } 588 } 589 } 590 (void)in6_pcbnotify(pcbinfo, sa, uh.uh_dport, 591 (struct sockaddr *)ip6cp->ip6c_src, uh.uh_sport, cmd, 592 cmdarg, notify); 593 } else 594 (void)in6_pcbnotify(pcbinfo, sa, 0, 595 (const struct sockaddr *)sa6_src, 0, cmd, cmdarg, notify); 596 } 597 598 void 599 udp6_ctlinput(int cmd, struct sockaddr *sa, void *d) 600 { 601 602 return (udp6_common_ctlinput(cmd, sa, d, &V_udbinfo)); 603 } 604 605 void 606 udplite6_ctlinput(int cmd, struct sockaddr *sa, void *d) 607 { 608 609 return (udp6_common_ctlinput(cmd, sa, d, &V_ulitecbinfo)); 610 } 611 612 static int 613 udp6_getcred(SYSCTL_HANDLER_ARGS) 614 { 615 struct xucred xuc; 616 struct sockaddr_in6 addrs[2]; 617 struct inpcb *inp; 618 int error; 619 620 error = priv_check(req->td, PRIV_NETINET_GETCRED); 621 if (error) 622 return (error); 623 624 if (req->newlen != sizeof(addrs)) 625 return (EINVAL); 626 if (req->oldlen != sizeof(struct xucred)) 627 return (EINVAL); 628 error = SYSCTL_IN(req, addrs, sizeof(addrs)); 629 if (error) 630 return (error); 631 if ((error = sa6_embedscope(&addrs[0], V_ip6_use_defzone)) != 0 || 632 (error = sa6_embedscope(&addrs[1], V_ip6_use_defzone)) != 0) { 633 return (error); 634 } 635 inp = in6_pcblookup(&V_udbinfo, &addrs[1].sin6_addr, 636 addrs[1].sin6_port, &addrs[0].sin6_addr, addrs[0].sin6_port, 637 INPLOOKUP_WILDCARD | INPLOOKUP_RLOCKPCB, NULL); 638 if (inp != NULL) { 639 INP_RLOCK_ASSERT(inp); 640 if (inp->inp_socket == NULL) 641 error = ENOENT; 642 if (error == 0) 643 error = cr_canseesocket(req->td->td_ucred, 644 inp->inp_socket); 645 if (error == 0) 646 cru2x(inp->inp_cred, &xuc); 647 INP_RUNLOCK(inp); 648 } else 649 error = ENOENT; 650 if (error == 0) 651 error = SYSCTL_OUT(req, &xuc, sizeof(struct xucred)); 652 return (error); 653 } 654 655 SYSCTL_PROC(_net_inet6_udp6, OID_AUTO, getcred, CTLTYPE_OPAQUE|CTLFLAG_RW, 0, 656 0, udp6_getcred, "S,xucred", "Get the xucred of a UDP6 connection"); 657 658 static int 659 udp6_output(struct inpcb *inp, struct mbuf *m, struct sockaddr *addr6, 660 struct mbuf *control, struct thread *td) 661 { 662 u_int32_t ulen = m->m_pkthdr.len; 663 u_int32_t plen = sizeof(struct udphdr) + ulen; 664 struct ip6_hdr *ip6; 665 struct udphdr *udp6; 666 struct in6_addr *laddr, *faddr, in6a; 667 struct sockaddr_in6 *sin6 = NULL; 668 int cscov_partial = 0; 669 int scope_ambiguous = 0; 670 u_short fport; 671 int error = 0; 672 uint8_t nxt; 673 uint16_t cscov = 0; 674 struct ip6_pktopts *optp, opt; 675 int af = AF_INET6, hlen = sizeof(struct ip6_hdr); 676 int flags; 677 struct sockaddr_in6 tmp; 678 679 INP_WLOCK_ASSERT(inp); 680 INP_HASH_WLOCK_ASSERT(inp->inp_pcbinfo); 681 682 if (addr6) { 683 /* addr6 has been validated in udp6_send(). */ 684 sin6 = (struct sockaddr_in6 *)addr6; 685 686 /* protect *sin6 from overwrites */ 687 tmp = *sin6; 688 sin6 = &tmp; 689 690 /* 691 * Application should provide a proper zone ID or the use of 692 * default zone IDs should be enabled. Unfortunately, some 693 * applications do not behave as it should, so we need a 694 * workaround. Even if an appropriate ID is not determined, 695 * we'll see if we can determine the outgoing interface. If we 696 * can, determine the zone ID based on the interface below. 697 */ 698 if (sin6->sin6_scope_id == 0 && !V_ip6_use_defzone) 699 scope_ambiguous = 1; 700 if ((error = sa6_embedscope(sin6, V_ip6_use_defzone)) != 0) 701 return (error); 702 } 703 704 nxt = (inp->inp_socket->so_proto->pr_protocol == IPPROTO_UDP) ? 705 IPPROTO_UDP : IPPROTO_UDPLITE; 706 if (control) { 707 if ((error = ip6_setpktopts(control, &opt, 708 inp->in6p_outputopts, td->td_ucred, nxt)) != 0) 709 goto release; 710 optp = &opt; 711 } else 712 optp = inp->in6p_outputopts; 713 714 if (sin6) { 715 faddr = &sin6->sin6_addr; 716 717 /* 718 * Since we saw no essential reason for calling in_pcbconnect, 719 * we get rid of such kind of logic, and call in6_selectsrc 720 * and in6_pcbsetport in order to fill in the local address 721 * and the local port. 722 */ 723 if (sin6->sin6_port == 0) { 724 error = EADDRNOTAVAIL; 725 goto release; 726 } 727 728 if (!IN6_IS_ADDR_UNSPECIFIED(&inp->in6p_faddr)) { 729 /* how about ::ffff:0.0.0.0 case? */ 730 error = EISCONN; 731 goto release; 732 } 733 734 fport = sin6->sin6_port; /* allow 0 port */ 735 736 if (IN6_IS_ADDR_V4MAPPED(faddr)) { 737 if ((inp->inp_flags & IN6P_IPV6_V6ONLY)) { 738 /* 739 * I believe we should explicitly discard the 740 * packet when mapped addresses are disabled, 741 * rather than send the packet as an IPv6 one. 742 * If we chose the latter approach, the packet 743 * might be sent out on the wire based on the 744 * default route, the situation which we'd 745 * probably want to avoid. 746 * (20010421 jinmei@kame.net) 747 */ 748 error = EINVAL; 749 goto release; 750 } 751 if (!IN6_IS_ADDR_UNSPECIFIED(&inp->in6p_laddr) && 752 !IN6_IS_ADDR_V4MAPPED(&inp->in6p_laddr)) { 753 /* 754 * when remote addr is an IPv4-mapped address, 755 * local addr should not be an IPv6 address, 756 * since you cannot determine how to map IPv6 757 * source address to IPv4. 758 */ 759 error = EINVAL; 760 goto release; 761 } 762 763 af = AF_INET; 764 } 765 766 if (!IN6_IS_ADDR_V4MAPPED(faddr)) { 767 error = in6_selectsrc_socket(sin6, optp, inp, 768 td->td_ucred, scope_ambiguous, &in6a, NULL); 769 if (error) 770 goto release; 771 laddr = &in6a; 772 } else 773 laddr = &inp->in6p_laddr; /* XXX */ 774 if (laddr == NULL) { 775 if (error == 0) 776 error = EADDRNOTAVAIL; 777 goto release; 778 } 779 if (inp->inp_lport == 0 && 780 (error = in6_pcbsetport(laddr, inp, td->td_ucred)) != 0) { 781 /* Undo an address bind that may have occurred. */ 782 inp->in6p_laddr = in6addr_any; 783 goto release; 784 } 785 } else { 786 if (IN6_IS_ADDR_UNSPECIFIED(&inp->in6p_faddr)) { 787 error = ENOTCONN; 788 goto release; 789 } 790 if (IN6_IS_ADDR_V4MAPPED(&inp->in6p_faddr)) { 791 if ((inp->inp_flags & IN6P_IPV6_V6ONLY)) { 792 /* 793 * XXX: this case would happen when the 794 * application sets the V6ONLY flag after 795 * connecting the foreign address. 796 * Such applications should be fixed, 797 * so we bark here. 798 */ 799 log(LOG_INFO, "udp6_output: IPV6_V6ONLY " 800 "option was set for a connected socket\n"); 801 error = EINVAL; 802 goto release; 803 } else 804 af = AF_INET; 805 } 806 laddr = &inp->in6p_laddr; 807 faddr = &inp->in6p_faddr; 808 fport = inp->inp_fport; 809 } 810 811 if (af == AF_INET) 812 hlen = sizeof(struct ip); 813 814 /* 815 * Calculate data length and get a mbuf 816 * for UDP and IP6 headers. 817 */ 818 M_PREPEND(m, hlen + sizeof(struct udphdr), M_NOWAIT); 819 if (m == NULL) { 820 error = ENOBUFS; 821 goto release; 822 } 823 824 /* 825 * Stuff checksum and output datagram. 826 */ 827 udp6 = (struct udphdr *)(mtod(m, caddr_t) + hlen); 828 udp6->uh_sport = inp->inp_lport; /* lport is always set in the PCB */ 829 udp6->uh_dport = fport; 830 if (nxt == IPPROTO_UDPLITE) { 831 struct udpcb *up; 832 833 up = intoudpcb(inp); 834 cscov = up->u_txcslen; 835 if (cscov >= plen) 836 cscov = 0; 837 udp6->uh_ulen = htons(cscov); 838 /* 839 * For UDP-Lite, checksum coverage length of zero means 840 * the entire UDPLite packet is covered by the checksum. 841 */ 842 cscov_partial = (cscov == 0) ? 0 : 1; 843 } else if (plen <= 0xffff) 844 udp6->uh_ulen = htons((u_short)plen); 845 else 846 udp6->uh_ulen = 0; 847 udp6->uh_sum = 0; 848 849 switch (af) { 850 case AF_INET6: 851 ip6 = mtod(m, struct ip6_hdr *); 852 ip6->ip6_flow = inp->inp_flow & IPV6_FLOWINFO_MASK; 853 ip6->ip6_vfc &= ~IPV6_VERSION_MASK; 854 ip6->ip6_vfc |= IPV6_VERSION; 855 ip6->ip6_plen = htons((u_short)plen); 856 ip6->ip6_nxt = nxt; 857 ip6->ip6_hlim = in6_selecthlim(inp, NULL); 858 ip6->ip6_src = *laddr; 859 ip6->ip6_dst = *faddr; 860 861 if (cscov_partial) { 862 if ((udp6->uh_sum = in6_cksum_partial(m, nxt, 863 sizeof(struct ip6_hdr), plen, cscov)) == 0) 864 udp6->uh_sum = 0xffff; 865 } else { 866 udp6->uh_sum = in6_cksum_pseudo(ip6, plen, nxt, 0); 867 m->m_pkthdr.csum_flags = CSUM_UDP_IPV6; 868 m->m_pkthdr.csum_data = offsetof(struct udphdr, uh_sum); 869 } 870 871 #ifdef RSS 872 { 873 uint32_t hash_val, hash_type; 874 uint8_t pr; 875 876 pr = inp->inp_socket->so_proto->pr_protocol; 877 /* 878 * Calculate an appropriate RSS hash for UDP and 879 * UDP Lite. 880 * 881 * The called function will take care of figuring out 882 * whether a 2-tuple or 4-tuple hash is required based 883 * on the currently configured scheme. 884 * 885 * Later later on connected socket values should be 886 * cached in the inpcb and reused, rather than constantly 887 * re-calculating it. 888 * 889 * UDP Lite is a different protocol number and will 890 * likely end up being hashed as a 2-tuple until 891 * RSS / NICs grow UDP Lite protocol awareness. 892 */ 893 if (rss_proto_software_hash_v6(faddr, laddr, fport, 894 inp->inp_lport, pr, &hash_val, &hash_type) == 0) { 895 m->m_pkthdr.flowid = hash_val; 896 M_HASHTYPE_SET(m, hash_type); 897 } 898 } 899 #endif 900 flags = 0; 901 #ifdef RSS 902 /* 903 * Don't override with the inp cached flowid. 904 * 905 * Until the whole UDP path is vetted, it may actually 906 * be incorrect. 907 */ 908 flags |= IP_NODEFAULTFLOWID; 909 #endif 910 911 UDP_PROBE(send, NULL, inp, ip6, inp, udp6); 912 UDPSTAT_INC(udps_opackets); 913 error = ip6_output(m, optp, &inp->inp_route6, flags, 914 inp->in6p_moptions, NULL, inp); 915 break; 916 case AF_INET: 917 error = EAFNOSUPPORT; 918 goto release; 919 } 920 goto releaseopt; 921 922 release: 923 m_freem(m); 924 925 releaseopt: 926 if (control) { 927 ip6_clearpktopts(&opt, -1); 928 m_freem(control); 929 } 930 return (error); 931 } 932 933 static void 934 udp6_abort(struct socket *so) 935 { 936 struct inpcb *inp; 937 struct inpcbinfo *pcbinfo; 938 939 pcbinfo = udp_get_inpcbinfo(so->so_proto->pr_protocol); 940 inp = sotoinpcb(so); 941 KASSERT(inp != NULL, ("udp6_abort: inp == NULL")); 942 943 INP_WLOCK(inp); 944 #ifdef INET 945 if (inp->inp_vflag & INP_IPV4) { 946 struct pr_usrreqs *pru; 947 uint8_t nxt; 948 949 nxt = (inp->inp_socket->so_proto->pr_protocol == IPPROTO_UDP) ? 950 IPPROTO_UDP : IPPROTO_UDPLITE; 951 INP_WUNLOCK(inp); 952 pru = inetsw[ip_protox[nxt]].pr_usrreqs; 953 (*pru->pru_abort)(so); 954 return; 955 } 956 #endif 957 958 if (!IN6_IS_ADDR_UNSPECIFIED(&inp->in6p_faddr)) { 959 INP_HASH_WLOCK(pcbinfo); 960 in6_pcbdisconnect(inp); 961 inp->in6p_laddr = in6addr_any; 962 INP_HASH_WUNLOCK(pcbinfo); 963 soisdisconnected(so); 964 } 965 INP_WUNLOCK(inp); 966 } 967 968 static int 969 udp6_attach(struct socket *so, int proto, struct thread *td) 970 { 971 struct inpcb *inp; 972 struct inpcbinfo *pcbinfo; 973 int error; 974 975 pcbinfo = udp_get_inpcbinfo(so->so_proto->pr_protocol); 976 inp = sotoinpcb(so); 977 KASSERT(inp == NULL, ("udp6_attach: inp != NULL")); 978 979 if (so->so_snd.sb_hiwat == 0 || so->so_rcv.sb_hiwat == 0) { 980 error = soreserve(so, udp_sendspace, udp_recvspace); 981 if (error) 982 return (error); 983 } 984 INP_INFO_WLOCK(pcbinfo); 985 error = in_pcballoc(so, pcbinfo); 986 if (error) { 987 INP_INFO_WUNLOCK(pcbinfo); 988 return (error); 989 } 990 inp = (struct inpcb *)so->so_pcb; 991 inp->inp_vflag |= INP_IPV6; 992 if ((inp->inp_flags & IN6P_IPV6_V6ONLY) == 0) 993 inp->inp_vflag |= INP_IPV4; 994 inp->in6p_hops = -1; /* use kernel default */ 995 inp->in6p_cksum = -1; /* just to be sure */ 996 /* 997 * XXX: ugly!! 998 * IPv4 TTL initialization is necessary for an IPv6 socket as well, 999 * because the socket may be bound to an IPv6 wildcard address, 1000 * which may match an IPv4-mapped IPv6 address. 1001 */ 1002 inp->inp_ip_ttl = V_ip_defttl; 1003 1004 error = udp_newudpcb(inp); 1005 if (error) { 1006 in_pcbdetach(inp); 1007 in_pcbfree(inp); 1008 INP_INFO_WUNLOCK(pcbinfo); 1009 return (error); 1010 } 1011 INP_WUNLOCK(inp); 1012 INP_INFO_WUNLOCK(pcbinfo); 1013 return (0); 1014 } 1015 1016 static int 1017 udp6_bind(struct socket *so, struct sockaddr *nam, struct thread *td) 1018 { 1019 struct inpcb *inp; 1020 struct inpcbinfo *pcbinfo; 1021 int error; 1022 1023 pcbinfo = udp_get_inpcbinfo(so->so_proto->pr_protocol); 1024 inp = sotoinpcb(so); 1025 KASSERT(inp != NULL, ("udp6_bind: inp == NULL")); 1026 1027 INP_WLOCK(inp); 1028 INP_HASH_WLOCK(pcbinfo); 1029 inp->inp_vflag &= ~INP_IPV4; 1030 inp->inp_vflag |= INP_IPV6; 1031 if ((inp->inp_flags & IN6P_IPV6_V6ONLY) == 0) { 1032 struct sockaddr_in6 *sin6_p; 1033 1034 sin6_p = (struct sockaddr_in6 *)nam; 1035 1036 if (IN6_IS_ADDR_UNSPECIFIED(&sin6_p->sin6_addr)) 1037 inp->inp_vflag |= INP_IPV4; 1038 #ifdef INET 1039 else if (IN6_IS_ADDR_V4MAPPED(&sin6_p->sin6_addr)) { 1040 struct sockaddr_in sin; 1041 1042 in6_sin6_2_sin(&sin, sin6_p); 1043 inp->inp_vflag |= INP_IPV4; 1044 inp->inp_vflag &= ~INP_IPV6; 1045 error = in_pcbbind(inp, (struct sockaddr *)&sin, 1046 td->td_ucred); 1047 goto out; 1048 } 1049 #endif 1050 } 1051 1052 error = in6_pcbbind(inp, nam, td->td_ucred); 1053 #ifdef INET 1054 out: 1055 #endif 1056 INP_HASH_WUNLOCK(pcbinfo); 1057 INP_WUNLOCK(inp); 1058 return (error); 1059 } 1060 1061 static void 1062 udp6_close(struct socket *so) 1063 { 1064 struct inpcb *inp; 1065 struct inpcbinfo *pcbinfo; 1066 1067 pcbinfo = udp_get_inpcbinfo(so->so_proto->pr_protocol); 1068 inp = sotoinpcb(so); 1069 KASSERT(inp != NULL, ("udp6_close: inp == NULL")); 1070 1071 INP_WLOCK(inp); 1072 #ifdef INET 1073 if (inp->inp_vflag & INP_IPV4) { 1074 struct pr_usrreqs *pru; 1075 uint8_t nxt; 1076 1077 nxt = (inp->inp_socket->so_proto->pr_protocol == IPPROTO_UDP) ? 1078 IPPROTO_UDP : IPPROTO_UDPLITE; 1079 INP_WUNLOCK(inp); 1080 pru = inetsw[ip_protox[nxt]].pr_usrreqs; 1081 (*pru->pru_disconnect)(so); 1082 return; 1083 } 1084 #endif 1085 if (!IN6_IS_ADDR_UNSPECIFIED(&inp->in6p_faddr)) { 1086 INP_HASH_WLOCK(pcbinfo); 1087 in6_pcbdisconnect(inp); 1088 inp->in6p_laddr = in6addr_any; 1089 INP_HASH_WUNLOCK(pcbinfo); 1090 soisdisconnected(so); 1091 } 1092 INP_WUNLOCK(inp); 1093 } 1094 1095 static int 1096 udp6_connect(struct socket *so, struct sockaddr *nam, struct thread *td) 1097 { 1098 struct inpcb *inp; 1099 struct inpcbinfo *pcbinfo; 1100 struct sockaddr_in6 *sin6; 1101 int error; 1102 1103 pcbinfo = udp_get_inpcbinfo(so->so_proto->pr_protocol); 1104 inp = sotoinpcb(so); 1105 sin6 = (struct sockaddr_in6 *)nam; 1106 KASSERT(inp != NULL, ("udp6_connect: inp == NULL")); 1107 1108 /* 1109 * XXXRW: Need to clarify locking of v4/v6 flags. 1110 */ 1111 INP_WLOCK(inp); 1112 #ifdef INET 1113 if (IN6_IS_ADDR_V4MAPPED(&sin6->sin6_addr)) { 1114 struct sockaddr_in sin; 1115 1116 if ((inp->inp_flags & IN6P_IPV6_V6ONLY) != 0) { 1117 error = EINVAL; 1118 goto out; 1119 } 1120 if ((inp->inp_vflag & INP_IPV4) == 0) { 1121 error = EAFNOSUPPORT; 1122 goto out; 1123 } 1124 if (inp->inp_faddr.s_addr != INADDR_ANY) { 1125 error = EISCONN; 1126 goto out; 1127 } 1128 in6_sin6_2_sin(&sin, sin6); 1129 inp->inp_vflag |= INP_IPV4; 1130 inp->inp_vflag &= ~INP_IPV6; 1131 error = prison_remote_ip4(td->td_ucred, &sin.sin_addr); 1132 if (error != 0) 1133 goto out; 1134 INP_HASH_WLOCK(pcbinfo); 1135 error = in_pcbconnect(inp, (struct sockaddr *)&sin, 1136 td->td_ucred); 1137 INP_HASH_WUNLOCK(pcbinfo); 1138 if (error == 0) 1139 soisconnected(so); 1140 goto out; 1141 } else { 1142 if ((inp->inp_vflag & INP_IPV6) == 0) { 1143 error = EAFNOSUPPORT; 1144 goto out; 1145 } 1146 } 1147 #endif 1148 if (!IN6_IS_ADDR_UNSPECIFIED(&inp->in6p_faddr)) { 1149 error = EISCONN; 1150 goto out; 1151 } 1152 inp->inp_vflag &= ~INP_IPV4; 1153 inp->inp_vflag |= INP_IPV6; 1154 error = prison_remote_ip6(td->td_ucred, &sin6->sin6_addr); 1155 if (error != 0) 1156 goto out; 1157 INP_HASH_WLOCK(pcbinfo); 1158 error = in6_pcbconnect(inp, nam, td->td_ucred); 1159 INP_HASH_WUNLOCK(pcbinfo); 1160 if (error == 0) 1161 soisconnected(so); 1162 out: 1163 INP_WUNLOCK(inp); 1164 return (error); 1165 } 1166 1167 static void 1168 udp6_detach(struct socket *so) 1169 { 1170 struct inpcb *inp; 1171 struct inpcbinfo *pcbinfo; 1172 struct udpcb *up; 1173 1174 pcbinfo = udp_get_inpcbinfo(so->so_proto->pr_protocol); 1175 inp = sotoinpcb(so); 1176 KASSERT(inp != NULL, ("udp6_detach: inp == NULL")); 1177 1178 INP_INFO_WLOCK(pcbinfo); 1179 INP_WLOCK(inp); 1180 up = intoudpcb(inp); 1181 KASSERT(up != NULL, ("%s: up == NULL", __func__)); 1182 in_pcbdetach(inp); 1183 in_pcbfree(inp); 1184 INP_INFO_WUNLOCK(pcbinfo); 1185 udp_discardcb(up); 1186 } 1187 1188 static int 1189 udp6_disconnect(struct socket *so) 1190 { 1191 struct inpcb *inp; 1192 struct inpcbinfo *pcbinfo; 1193 int error; 1194 1195 pcbinfo = udp_get_inpcbinfo(so->so_proto->pr_protocol); 1196 inp = sotoinpcb(so); 1197 KASSERT(inp != NULL, ("udp6_disconnect: inp == NULL")); 1198 1199 INP_WLOCK(inp); 1200 #ifdef INET 1201 if (inp->inp_vflag & INP_IPV4) { 1202 struct pr_usrreqs *pru; 1203 uint8_t nxt; 1204 1205 nxt = (inp->inp_socket->so_proto->pr_protocol == IPPROTO_UDP) ? 1206 IPPROTO_UDP : IPPROTO_UDPLITE; 1207 INP_WUNLOCK(inp); 1208 pru = inetsw[ip_protox[nxt]].pr_usrreqs; 1209 (void)(*pru->pru_disconnect)(so); 1210 return (0); 1211 } 1212 #endif 1213 1214 if (IN6_IS_ADDR_UNSPECIFIED(&inp->in6p_faddr)) { 1215 error = ENOTCONN; 1216 goto out; 1217 } 1218 1219 INP_HASH_WLOCK(pcbinfo); 1220 in6_pcbdisconnect(inp); 1221 inp->in6p_laddr = in6addr_any; 1222 INP_HASH_WUNLOCK(pcbinfo); 1223 SOCK_LOCK(so); 1224 so->so_state &= ~SS_ISCONNECTED; /* XXX */ 1225 SOCK_UNLOCK(so); 1226 out: 1227 INP_WUNLOCK(inp); 1228 return (0); 1229 } 1230 1231 static int 1232 udp6_send(struct socket *so, int flags, struct mbuf *m, 1233 struct sockaddr *addr, struct mbuf *control, struct thread *td) 1234 { 1235 struct inpcb *inp; 1236 struct inpcbinfo *pcbinfo; 1237 int error = 0; 1238 1239 pcbinfo = udp_get_inpcbinfo(so->so_proto->pr_protocol); 1240 inp = sotoinpcb(so); 1241 KASSERT(inp != NULL, ("udp6_send: inp == NULL")); 1242 1243 INP_WLOCK(inp); 1244 if (addr) { 1245 if (addr->sa_len != sizeof(struct sockaddr_in6)) { 1246 error = EINVAL; 1247 goto bad; 1248 } 1249 if (addr->sa_family != AF_INET6) { 1250 error = EAFNOSUPPORT; 1251 goto bad; 1252 } 1253 } 1254 1255 #ifdef INET 1256 if ((inp->inp_flags & IN6P_IPV6_V6ONLY) == 0) { 1257 int hasv4addr; 1258 struct sockaddr_in6 *sin6 = NULL; 1259 1260 if (addr == NULL) 1261 hasv4addr = (inp->inp_vflag & INP_IPV4); 1262 else { 1263 sin6 = (struct sockaddr_in6 *)addr; 1264 hasv4addr = IN6_IS_ADDR_V4MAPPED(&sin6->sin6_addr) 1265 ? 1 : 0; 1266 } 1267 if (hasv4addr) { 1268 struct pr_usrreqs *pru; 1269 uint8_t nxt; 1270 1271 nxt = (inp->inp_socket->so_proto->pr_protocol == 1272 IPPROTO_UDP) ? IPPROTO_UDP : IPPROTO_UDPLITE; 1273 /* 1274 * XXXRW: We release UDP-layer locks before calling 1275 * udp_send() in order to avoid recursion. However, 1276 * this does mean there is a short window where inp's 1277 * fields are unstable. Could this lead to a 1278 * potential race in which the factors causing us to 1279 * select the UDPv4 output routine are invalidated? 1280 */ 1281 INP_WUNLOCK(inp); 1282 if (sin6) 1283 in6_sin6_2_sin_in_sock(addr); 1284 pru = inetsw[ip_protox[nxt]].pr_usrreqs; 1285 /* addr will just be freed in sendit(). */ 1286 return ((*pru->pru_send)(so, flags, m, addr, control, 1287 td)); 1288 } 1289 } 1290 #endif 1291 #ifdef MAC 1292 mac_inpcb_create_mbuf(inp, m); 1293 #endif 1294 INP_HASH_WLOCK(pcbinfo); 1295 error = udp6_output(inp, m, addr, control, td); 1296 INP_HASH_WUNLOCK(pcbinfo); 1297 INP_WUNLOCK(inp); 1298 return (error); 1299 1300 bad: 1301 INP_WUNLOCK(inp); 1302 m_freem(m); 1303 return (error); 1304 } 1305 1306 struct pr_usrreqs udp6_usrreqs = { 1307 .pru_abort = udp6_abort, 1308 .pru_attach = udp6_attach, 1309 .pru_bind = udp6_bind, 1310 .pru_connect = udp6_connect, 1311 .pru_control = in6_control, 1312 .pru_detach = udp6_detach, 1313 .pru_disconnect = udp6_disconnect, 1314 .pru_peeraddr = in6_mapped_peeraddr, 1315 .pru_send = udp6_send, 1316 .pru_shutdown = udp_shutdown, 1317 .pru_sockaddr = in6_mapped_sockaddr, 1318 .pru_soreceive = soreceive_dgram, 1319 .pru_sosend = sosend_dgram, 1320 .pru_sosetlabel = in_pcbsosetlabel, 1321 .pru_close = udp6_close 1322 }; 1323