1 /*- 2 * Copyright (C) 1995, 1996, 1997, and 1998 WIDE Project. 3 * Copyright (c) 2010-2011 Juniper Networks, Inc. 4 * Copyright (c) 2014 Kevin Lo 5 * All rights reserved. 6 * 7 * Portions of this software were developed by Robert N. M. Watson under 8 * contract to Juniper Networks, Inc. 9 * 10 * Redistribution and use in source and binary forms, with or without 11 * modification, are permitted provided that the following conditions 12 * are met: 13 * 1. Redistributions of source code must retain the above copyright 14 * notice, this list of conditions and the following disclaimer. 15 * 2. Redistributions in binary form must reproduce the above copyright 16 * notice, this list of conditions and the following disclaimer in the 17 * documentation and/or other materials provided with the distribution. 18 * 3. Neither the name of the project nor the names of its contributors 19 * may be used to endorse or promote products derived from this software 20 * without specific prior written permission. 21 * 22 * THIS SOFTWARE IS PROVIDED BY THE PROJECT AND CONTRIBUTORS ``AS IS'' AND 23 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 24 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 25 * ARE DISCLAIMED. IN NO EVENT SHALL THE PROJECT OR CONTRIBUTORS BE LIABLE 26 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 27 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 28 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 29 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 30 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 31 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 32 * SUCH DAMAGE. 33 * 34 * $KAME: udp6_usrreq.c,v 1.27 2001/05/21 05:45:10 jinmei Exp $ 35 * $KAME: udp6_output.c,v 1.31 2001/05/21 16:39:15 jinmei Exp $ 36 */ 37 38 /*- 39 * Copyright (c) 1982, 1986, 1988, 1990, 1993, 1995 40 * The Regents of the University of California. 41 * All rights reserved. 42 * 43 * Redistribution and use in source and binary forms, with or without 44 * modification, are permitted provided that the following conditions 45 * are met: 46 * 1. Redistributions of source code must retain the above copyright 47 * notice, this list of conditions and the following disclaimer. 48 * 2. Redistributions in binary form must reproduce the above copyright 49 * notice, this list of conditions and the following disclaimer in the 50 * documentation and/or other materials provided with the distribution. 51 * 3. Neither the name of the University nor the names of its contributors 52 * may be used to endorse or promote products derived from this software 53 * without specific prior written permission. 54 * 55 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND 56 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 57 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 58 * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE 59 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 60 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 61 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 62 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 63 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 64 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 65 * SUCH DAMAGE. 66 * 67 * @(#)udp_usrreq.c 8.6 (Berkeley) 5/23/95 68 */ 69 70 #include <sys/cdefs.h> 71 __FBSDID("$FreeBSD$"); 72 73 #include "opt_inet.h" 74 #include "opt_inet6.h" 75 #include "opt_ipsec.h" 76 #include "opt_rss.h" 77 78 #include <sys/param.h> 79 #include <sys/jail.h> 80 #include <sys/kernel.h> 81 #include <sys/lock.h> 82 #include <sys/mbuf.h> 83 #include <sys/priv.h> 84 #include <sys/proc.h> 85 #include <sys/protosw.h> 86 #include <sys/sdt.h> 87 #include <sys/signalvar.h> 88 #include <sys/socket.h> 89 #include <sys/socketvar.h> 90 #include <sys/sx.h> 91 #include <sys/sysctl.h> 92 #include <sys/syslog.h> 93 #include <sys/systm.h> 94 95 #include <net/if.h> 96 #include <net/if_var.h> 97 #include <net/if_types.h> 98 #include <net/route.h> 99 #include <net/rss_config.h> 100 101 #include <netinet/in.h> 102 #include <netinet/in_kdtrace.h> 103 #include <netinet/in_pcb.h> 104 #include <netinet/in_systm.h> 105 #include <netinet/in_var.h> 106 #include <netinet/ip.h> 107 #include <netinet/ip6.h> 108 #include <netinet/icmp6.h> 109 #include <netinet/ip_var.h> 110 #include <netinet/udp.h> 111 #include <netinet/udp_var.h> 112 #include <netinet/udplite.h> 113 114 #include <netinet6/ip6protosw.h> 115 #include <netinet6/ip6_var.h> 116 #include <netinet6/in6_pcb.h> 117 #include <netinet6/in6_rss.h> 118 #include <netinet6/udp6_var.h> 119 #include <netinet6/scope6_var.h> 120 121 #include <netipsec/ipsec_support.h> 122 123 #include <security/mac/mac_framework.h> 124 125 /* 126 * UDP protocol implementation. 127 * Per RFC 768, August, 1980. 128 */ 129 130 extern struct protosw inetsw[]; 131 static void udp6_detach(struct socket *so); 132 133 static int 134 udp6_append(struct inpcb *inp, struct mbuf *n, int off, 135 struct sockaddr_in6 *fromsa) 136 { 137 struct socket *so; 138 struct mbuf *opts = NULL, *tmp_opts; 139 struct udpcb *up; 140 141 INP_LOCK_ASSERT(inp); 142 143 /* 144 * Engage the tunneling protocol. 145 */ 146 up = intoudpcb(inp); 147 if (up->u_tun_func != NULL) { 148 in_pcbref(inp); 149 INP_RUNLOCK(inp); 150 (*up->u_tun_func)(n, off, inp, (struct sockaddr *)&fromsa[0], 151 up->u_tun_ctx); 152 INP_RLOCK(inp); 153 return (in_pcbrele_rlocked(inp)); 154 } 155 #if defined(IPSEC) || defined(IPSEC_SUPPORT) 156 /* Check AH/ESP integrity. */ 157 if (IPSEC_ENABLED(ipv6)) { 158 if (IPSEC_CHECK_POLICY(ipv6, n, inp) != 0) { 159 m_freem(n); 160 return (0); 161 } 162 } 163 #endif /* IPSEC */ 164 #ifdef MAC 165 if (mac_inpcb_check_deliver(inp, n) != 0) { 166 m_freem(n); 167 return (0); 168 } 169 #endif 170 opts = NULL; 171 if (inp->inp_flags & INP_CONTROLOPTS || 172 inp->inp_socket->so_options & SO_TIMESTAMP) 173 ip6_savecontrol(inp, n, &opts); 174 if ((inp->inp_vflag & INP_IPV6) && (inp->inp_flags2 & INP_ORIGDSTADDR)) { 175 tmp_opts = sbcreatecontrol((caddr_t)&fromsa[1], 176 sizeof(struct sockaddr_in6), IPV6_ORIGDSTADDR, IPPROTO_IPV6); 177 if (tmp_opts) { 178 if (opts) { 179 tmp_opts->m_next = opts; 180 opts = tmp_opts; 181 } else 182 opts = tmp_opts; 183 } 184 185 } 186 m_adj(n, off + sizeof(struct udphdr)); 187 188 so = inp->inp_socket; 189 SOCKBUF_LOCK(&so->so_rcv); 190 if (sbappendaddr_locked(&so->so_rcv, (struct sockaddr *)&fromsa[0], n, 191 opts) == 0) { 192 SOCKBUF_UNLOCK(&so->so_rcv); 193 m_freem(n); 194 if (opts) 195 m_freem(opts); 196 UDPSTAT_INC(udps_fullsock); 197 } else 198 sorwakeup_locked(so); 199 return (0); 200 } 201 202 int 203 udp6_input(struct mbuf **mp, int *offp, int proto) 204 { 205 struct mbuf *m = *mp; 206 struct ifnet *ifp; 207 struct ip6_hdr *ip6; 208 struct udphdr *uh; 209 struct inpcb *inp; 210 struct inpcbinfo *pcbinfo; 211 struct udpcb *up; 212 int off = *offp; 213 int cscov_partial; 214 int plen, ulen; 215 struct sockaddr_in6 fromsa[2]; 216 struct m_tag *fwd_tag; 217 uint16_t uh_sum; 218 uint8_t nxt; 219 220 ifp = m->m_pkthdr.rcvif; 221 ip6 = mtod(m, struct ip6_hdr *); 222 223 #ifndef PULLDOWN_TEST 224 IP6_EXTHDR_CHECK(m, off, sizeof(struct udphdr), IPPROTO_DONE); 225 ip6 = mtod(m, struct ip6_hdr *); 226 uh = (struct udphdr *)((caddr_t)ip6 + off); 227 #else 228 IP6_EXTHDR_GET(uh, struct udphdr *, m, off, sizeof(*uh)); 229 if (!uh) 230 return (IPPROTO_DONE); 231 #endif 232 233 UDPSTAT_INC(udps_ipackets); 234 235 /* 236 * Destination port of 0 is illegal, based on RFC768. 237 */ 238 if (uh->uh_dport == 0) 239 goto badunlocked; 240 241 plen = ntohs(ip6->ip6_plen) - off + sizeof(*ip6); 242 ulen = ntohs((u_short)uh->uh_ulen); 243 244 nxt = proto; 245 cscov_partial = (nxt == IPPROTO_UDPLITE) ? 1 : 0; 246 if (nxt == IPPROTO_UDPLITE) { 247 /* Zero means checksum over the complete packet. */ 248 if (ulen == 0) 249 ulen = plen; 250 if (ulen == plen) 251 cscov_partial = 0; 252 if ((ulen < sizeof(struct udphdr)) || (ulen > plen)) { 253 /* XXX: What is the right UDPLite MIB counter? */ 254 goto badunlocked; 255 } 256 if (uh->uh_sum == 0) { 257 /* XXX: What is the right UDPLite MIB counter? */ 258 goto badunlocked; 259 } 260 } else { 261 if ((ulen < sizeof(struct udphdr)) || (plen != ulen)) { 262 UDPSTAT_INC(udps_badlen); 263 goto badunlocked; 264 } 265 if (uh->uh_sum == 0) { 266 UDPSTAT_INC(udps_nosum); 267 goto badunlocked; 268 } 269 } 270 271 if ((m->m_pkthdr.csum_flags & CSUM_DATA_VALID_IPV6) && 272 !cscov_partial) { 273 if (m->m_pkthdr.csum_flags & CSUM_PSEUDO_HDR) 274 uh_sum = m->m_pkthdr.csum_data; 275 else 276 uh_sum = in6_cksum_pseudo(ip6, ulen, nxt, 277 m->m_pkthdr.csum_data); 278 uh_sum ^= 0xffff; 279 } else 280 uh_sum = in6_cksum_partial(m, nxt, off, plen, ulen); 281 282 if (uh_sum != 0) { 283 UDPSTAT_INC(udps_badsum); 284 goto badunlocked; 285 } 286 287 /* 288 * Construct sockaddr format source address. 289 */ 290 init_sin6(&fromsa[0], m, 0); 291 fromsa[0].sin6_port = uh->uh_sport; 292 init_sin6(&fromsa[1], m, 1); 293 fromsa[1].sin6_port = uh->uh_dport; 294 295 pcbinfo = udp_get_inpcbinfo(nxt); 296 if (IN6_IS_ADDR_MULTICAST(&ip6->ip6_dst)) { 297 struct inpcb *last; 298 struct inpcbhead *pcblist; 299 struct ip6_moptions *imo; 300 301 INP_INFO_RLOCK(pcbinfo); 302 /* 303 * In the event that laddr should be set to the link-local 304 * address (this happens in RIPng), the multicast address 305 * specified in the received packet will not match laddr. To 306 * handle this situation, matching is relaxed if the 307 * receiving interface is the same as one specified in the 308 * socket and if the destination multicast address matches 309 * one of the multicast groups specified in the socket. 310 */ 311 312 /* 313 * KAME note: traditionally we dropped udpiphdr from mbuf 314 * here. We need udphdr for IPsec processing so we do that 315 * later. 316 */ 317 pcblist = udp_get_pcblist(nxt); 318 last = NULL; 319 LIST_FOREACH(inp, pcblist, inp_list) { 320 if ((inp->inp_vflag & INP_IPV6) == 0) 321 continue; 322 if (inp->inp_lport != uh->uh_dport) 323 continue; 324 if (inp->inp_fport != 0 && 325 inp->inp_fport != uh->uh_sport) 326 continue; 327 if (!IN6_IS_ADDR_UNSPECIFIED(&inp->in6p_laddr)) { 328 if (!IN6_ARE_ADDR_EQUAL(&inp->in6p_laddr, 329 &ip6->ip6_dst)) 330 continue; 331 } 332 if (!IN6_IS_ADDR_UNSPECIFIED(&inp->in6p_faddr)) { 333 if (!IN6_ARE_ADDR_EQUAL(&inp->in6p_faddr, 334 &ip6->ip6_src) || 335 inp->inp_fport != uh->uh_sport) 336 continue; 337 } 338 339 /* 340 * XXXRW: Because we weren't holding either the inpcb 341 * or the hash lock when we checked for a match 342 * before, we should probably recheck now that the 343 * inpcb lock is (supposed to be) held. 344 */ 345 346 /* 347 * Handle socket delivery policy for any-source 348 * and source-specific multicast. [RFC3678] 349 */ 350 imo = inp->in6p_moptions; 351 if (imo && IN6_IS_ADDR_MULTICAST(&ip6->ip6_dst)) { 352 struct sockaddr_in6 mcaddr; 353 int blocked; 354 355 INP_RLOCK(inp); 356 357 bzero(&mcaddr, sizeof(struct sockaddr_in6)); 358 mcaddr.sin6_len = sizeof(struct sockaddr_in6); 359 mcaddr.sin6_family = AF_INET6; 360 mcaddr.sin6_addr = ip6->ip6_dst; 361 362 blocked = im6o_mc_filter(imo, ifp, 363 (struct sockaddr *)&mcaddr, 364 (struct sockaddr *)&fromsa[0]); 365 if (blocked != MCAST_PASS) { 366 if (blocked == MCAST_NOTGMEMBER) 367 IP6STAT_INC(ip6s_notmember); 368 if (blocked == MCAST_NOTSMEMBER || 369 blocked == MCAST_MUTED) 370 UDPSTAT_INC(udps_filtermcast); 371 INP_RUNLOCK(inp); /* XXX */ 372 continue; 373 } 374 375 INP_RUNLOCK(inp); 376 } 377 if (last != NULL) { 378 struct mbuf *n; 379 380 if ((n = m_copym(m, 0, M_COPYALL, M_NOWAIT)) != 381 NULL) { 382 INP_RLOCK(last); 383 UDP_PROBE(receive, NULL, last, ip6, 384 last, uh); 385 if (udp6_append(last, n, off, fromsa)) 386 goto inp_lost; 387 INP_RUNLOCK(last); 388 } 389 } 390 last = inp; 391 /* 392 * Don't look for additional matches if this one does 393 * not have either the SO_REUSEPORT or SO_REUSEADDR 394 * socket options set. This heuristic avoids 395 * searching through all pcbs in the common case of a 396 * non-shared port. It assumes that an application 397 * will never clear these options after setting them. 398 */ 399 if ((last->inp_socket->so_options & 400 (SO_REUSEPORT|SO_REUSEADDR)) == 0) 401 break; 402 } 403 404 if (last == NULL) { 405 /* 406 * No matching pcb found; discard datagram. (No need 407 * to send an ICMP Port Unreachable for a broadcast 408 * or multicast datgram.) 409 */ 410 UDPSTAT_INC(udps_noport); 411 UDPSTAT_INC(udps_noportmcast); 412 goto badheadlocked; 413 } 414 INP_RLOCK(last); 415 INP_INFO_RUNLOCK(pcbinfo); 416 UDP_PROBE(receive, NULL, last, ip6, last, uh); 417 if (udp6_append(last, m, off, fromsa) == 0) 418 INP_RUNLOCK(last); 419 inp_lost: 420 return (IPPROTO_DONE); 421 } 422 /* 423 * Locate pcb for datagram. 424 */ 425 426 /* 427 * Grab info from PACKET_TAG_IPFORWARD tag prepended to the chain. 428 */ 429 if ((m->m_flags & M_IP6_NEXTHOP) && 430 (fwd_tag = m_tag_find(m, PACKET_TAG_IPFORWARD, NULL)) != NULL) { 431 struct sockaddr_in6 *next_hop6; 432 433 next_hop6 = (struct sockaddr_in6 *)(fwd_tag + 1); 434 435 /* 436 * Transparently forwarded. Pretend to be the destination. 437 * Already got one like this? 438 */ 439 inp = in6_pcblookup_mbuf(pcbinfo, &ip6->ip6_src, 440 uh->uh_sport, &ip6->ip6_dst, uh->uh_dport, 441 INPLOOKUP_RLOCKPCB, m->m_pkthdr.rcvif, m); 442 if (!inp) { 443 /* 444 * It's new. Try to find the ambushing socket. 445 * Because we've rewritten the destination address, 446 * any hardware-generated hash is ignored. 447 */ 448 inp = in6_pcblookup(pcbinfo, &ip6->ip6_src, 449 uh->uh_sport, &next_hop6->sin6_addr, 450 next_hop6->sin6_port ? htons(next_hop6->sin6_port) : 451 uh->uh_dport, INPLOOKUP_WILDCARD | 452 INPLOOKUP_RLOCKPCB, m->m_pkthdr.rcvif); 453 } 454 /* Remove the tag from the packet. We don't need it anymore. */ 455 m_tag_delete(m, fwd_tag); 456 m->m_flags &= ~M_IP6_NEXTHOP; 457 } else 458 inp = in6_pcblookup_mbuf(pcbinfo, &ip6->ip6_src, 459 uh->uh_sport, &ip6->ip6_dst, uh->uh_dport, 460 INPLOOKUP_WILDCARD | INPLOOKUP_RLOCKPCB, 461 m->m_pkthdr.rcvif, m); 462 if (inp == NULL) { 463 if (udp_log_in_vain) { 464 char ip6bufs[INET6_ADDRSTRLEN]; 465 char ip6bufd[INET6_ADDRSTRLEN]; 466 467 log(LOG_INFO, 468 "Connection attempt to UDP [%s]:%d from [%s]:%d\n", 469 ip6_sprintf(ip6bufd, &ip6->ip6_dst), 470 ntohs(uh->uh_dport), 471 ip6_sprintf(ip6bufs, &ip6->ip6_src), 472 ntohs(uh->uh_sport)); 473 } 474 UDPSTAT_INC(udps_noport); 475 if (m->m_flags & M_MCAST) { 476 printf("UDP6: M_MCAST is set in a unicast packet.\n"); 477 UDPSTAT_INC(udps_noportmcast); 478 goto badunlocked; 479 } 480 if (V_udp_blackhole) 481 goto badunlocked; 482 icmp6_error(m, ICMP6_DST_UNREACH, ICMP6_DST_UNREACH_NOPORT, 0); 483 return (IPPROTO_DONE); 484 } 485 INP_RLOCK_ASSERT(inp); 486 up = intoudpcb(inp); 487 if (cscov_partial) { 488 if (up->u_rxcslen == 0 || up->u_rxcslen > ulen) { 489 INP_RUNLOCK(inp); 490 m_freem(m); 491 return (IPPROTO_DONE); 492 } 493 } 494 UDP_PROBE(receive, NULL, inp, ip6, inp, uh); 495 if (udp6_append(inp, m, off, fromsa) == 0) 496 INP_RUNLOCK(inp); 497 return (IPPROTO_DONE); 498 499 badheadlocked: 500 INP_INFO_RUNLOCK(pcbinfo); 501 badunlocked: 502 if (m) 503 m_freem(m); 504 return (IPPROTO_DONE); 505 } 506 507 static void 508 udp6_common_ctlinput(int cmd, struct sockaddr *sa, void *d, 509 struct inpcbinfo *pcbinfo) 510 { 511 struct udphdr uh; 512 struct ip6_hdr *ip6; 513 struct mbuf *m; 514 int off = 0; 515 struct ip6ctlparam *ip6cp = NULL; 516 const struct sockaddr_in6 *sa6_src = NULL; 517 void *cmdarg; 518 struct inpcb *(*notify)(struct inpcb *, int) = udp_notify; 519 struct udp_portonly { 520 u_int16_t uh_sport; 521 u_int16_t uh_dport; 522 } *uhp; 523 524 if (sa->sa_family != AF_INET6 || 525 sa->sa_len != sizeof(struct sockaddr_in6)) 526 return; 527 528 if ((unsigned)cmd >= PRC_NCMDS) 529 return; 530 if (PRC_IS_REDIRECT(cmd)) 531 notify = in6_rtchange, d = NULL; 532 else if (cmd == PRC_HOSTDEAD) 533 d = NULL; 534 else if (inet6ctlerrmap[cmd] == 0) 535 return; 536 537 /* if the parameter is from icmp6, decode it. */ 538 if (d != NULL) { 539 ip6cp = (struct ip6ctlparam *)d; 540 m = ip6cp->ip6c_m; 541 ip6 = ip6cp->ip6c_ip6; 542 off = ip6cp->ip6c_off; 543 cmdarg = ip6cp->ip6c_cmdarg; 544 sa6_src = ip6cp->ip6c_src; 545 } else { 546 m = NULL; 547 ip6 = NULL; 548 cmdarg = NULL; 549 sa6_src = &sa6_any; 550 } 551 552 if (ip6) { 553 /* 554 * XXX: We assume that when IPV6 is non NULL, 555 * M and OFF are valid. 556 */ 557 558 /* Check if we can safely examine src and dst ports. */ 559 if (m->m_pkthdr.len < off + sizeof(*uhp)) 560 return; 561 562 bzero(&uh, sizeof(uh)); 563 m_copydata(m, off, sizeof(*uhp), (caddr_t)&uh); 564 565 if (!PRC_IS_REDIRECT(cmd)) { 566 /* Check to see if its tunneled */ 567 struct inpcb *inp; 568 inp = in6_pcblookup_mbuf(pcbinfo, &ip6->ip6_dst, 569 uh.uh_dport, &ip6->ip6_src, uh.uh_sport, 570 INPLOOKUP_WILDCARD | INPLOOKUP_RLOCKPCB, 571 m->m_pkthdr.rcvif, m); 572 if (inp != NULL) { 573 struct udpcb *up; 574 575 up = intoudpcb(inp); 576 if (up->u_icmp_func) { 577 /* Yes it is. */ 578 INP_RUNLOCK(inp); 579 (*up->u_icmp_func)(cmd, (struct sockaddr *)ip6cp->ip6c_src, 580 d, up->u_tun_ctx); 581 return; 582 } else { 583 /* Can't find it. */ 584 INP_RUNLOCK(inp); 585 } 586 } 587 } 588 (void)in6_pcbnotify(pcbinfo, sa, uh.uh_dport, 589 (struct sockaddr *)ip6cp->ip6c_src, uh.uh_sport, cmd, 590 cmdarg, notify); 591 } else 592 (void)in6_pcbnotify(pcbinfo, sa, 0, 593 (const struct sockaddr *)sa6_src, 0, cmd, cmdarg, notify); 594 } 595 596 void 597 udp6_ctlinput(int cmd, struct sockaddr *sa, void *d) 598 { 599 600 return (udp6_common_ctlinput(cmd, sa, d, &V_udbinfo)); 601 } 602 603 void 604 udplite6_ctlinput(int cmd, struct sockaddr *sa, void *d) 605 { 606 607 return (udp6_common_ctlinput(cmd, sa, d, &V_ulitecbinfo)); 608 } 609 610 static int 611 udp6_getcred(SYSCTL_HANDLER_ARGS) 612 { 613 struct xucred xuc; 614 struct sockaddr_in6 addrs[2]; 615 struct inpcb *inp; 616 int error; 617 618 error = priv_check(req->td, PRIV_NETINET_GETCRED); 619 if (error) 620 return (error); 621 622 if (req->newlen != sizeof(addrs)) 623 return (EINVAL); 624 if (req->oldlen != sizeof(struct xucred)) 625 return (EINVAL); 626 error = SYSCTL_IN(req, addrs, sizeof(addrs)); 627 if (error) 628 return (error); 629 if ((error = sa6_embedscope(&addrs[0], V_ip6_use_defzone)) != 0 || 630 (error = sa6_embedscope(&addrs[1], V_ip6_use_defzone)) != 0) { 631 return (error); 632 } 633 inp = in6_pcblookup(&V_udbinfo, &addrs[1].sin6_addr, 634 addrs[1].sin6_port, &addrs[0].sin6_addr, addrs[0].sin6_port, 635 INPLOOKUP_WILDCARD | INPLOOKUP_RLOCKPCB, NULL); 636 if (inp != NULL) { 637 INP_RLOCK_ASSERT(inp); 638 if (inp->inp_socket == NULL) 639 error = ENOENT; 640 if (error == 0) 641 error = cr_canseesocket(req->td->td_ucred, 642 inp->inp_socket); 643 if (error == 0) 644 cru2x(inp->inp_cred, &xuc); 645 INP_RUNLOCK(inp); 646 } else 647 error = ENOENT; 648 if (error == 0) 649 error = SYSCTL_OUT(req, &xuc, sizeof(struct xucred)); 650 return (error); 651 } 652 653 SYSCTL_PROC(_net_inet6_udp6, OID_AUTO, getcred, CTLTYPE_OPAQUE|CTLFLAG_RW, 0, 654 0, udp6_getcred, "S,xucred", "Get the xucred of a UDP6 connection"); 655 656 static int 657 udp6_output(struct inpcb *inp, struct mbuf *m, struct sockaddr *addr6, 658 struct mbuf *control, struct thread *td) 659 { 660 u_int32_t ulen = m->m_pkthdr.len; 661 u_int32_t plen = sizeof(struct udphdr) + ulen; 662 struct ip6_hdr *ip6; 663 struct udphdr *udp6; 664 struct in6_addr *laddr, *faddr, in6a; 665 struct sockaddr_in6 *sin6 = NULL; 666 int cscov_partial = 0; 667 int scope_ambiguous = 0; 668 u_short fport; 669 int error = 0; 670 uint8_t nxt; 671 uint16_t cscov = 0; 672 struct ip6_pktopts *optp, opt; 673 int af = AF_INET6, hlen = sizeof(struct ip6_hdr); 674 int flags; 675 struct sockaddr_in6 tmp; 676 677 INP_WLOCK_ASSERT(inp); 678 INP_HASH_WLOCK_ASSERT(inp->inp_pcbinfo); 679 680 if (addr6) { 681 /* addr6 has been validated in udp6_send(). */ 682 sin6 = (struct sockaddr_in6 *)addr6; 683 684 /* protect *sin6 from overwrites */ 685 tmp = *sin6; 686 sin6 = &tmp; 687 688 /* 689 * Application should provide a proper zone ID or the use of 690 * default zone IDs should be enabled. Unfortunately, some 691 * applications do not behave as it should, so we need a 692 * workaround. Even if an appropriate ID is not determined, 693 * we'll see if we can determine the outgoing interface. If we 694 * can, determine the zone ID based on the interface below. 695 */ 696 if (sin6->sin6_scope_id == 0 && !V_ip6_use_defzone) 697 scope_ambiguous = 1; 698 if ((error = sa6_embedscope(sin6, V_ip6_use_defzone)) != 0) 699 return (error); 700 } 701 702 nxt = (inp->inp_socket->so_proto->pr_protocol == IPPROTO_UDP) ? 703 IPPROTO_UDP : IPPROTO_UDPLITE; 704 if (control) { 705 if ((error = ip6_setpktopts(control, &opt, 706 inp->in6p_outputopts, td->td_ucred, nxt)) != 0) 707 goto release; 708 optp = &opt; 709 } else 710 optp = inp->in6p_outputopts; 711 712 if (sin6) { 713 faddr = &sin6->sin6_addr; 714 715 /* 716 * Since we saw no essential reason for calling in_pcbconnect, 717 * we get rid of such kind of logic, and call in6_selectsrc 718 * and in6_pcbsetport in order to fill in the local address 719 * and the local port. 720 */ 721 if (sin6->sin6_port == 0) { 722 error = EADDRNOTAVAIL; 723 goto release; 724 } 725 726 if (!IN6_IS_ADDR_UNSPECIFIED(&inp->in6p_faddr)) { 727 /* how about ::ffff:0.0.0.0 case? */ 728 error = EISCONN; 729 goto release; 730 } 731 732 fport = sin6->sin6_port; /* allow 0 port */ 733 734 if (IN6_IS_ADDR_V4MAPPED(faddr)) { 735 if ((inp->inp_flags & IN6P_IPV6_V6ONLY)) { 736 /* 737 * I believe we should explicitly discard the 738 * packet when mapped addresses are disabled, 739 * rather than send the packet as an IPv6 one. 740 * If we chose the latter approach, the packet 741 * might be sent out on the wire based on the 742 * default route, the situation which we'd 743 * probably want to avoid. 744 * (20010421 jinmei@kame.net) 745 */ 746 error = EINVAL; 747 goto release; 748 } 749 if (!IN6_IS_ADDR_UNSPECIFIED(&inp->in6p_laddr) && 750 !IN6_IS_ADDR_V4MAPPED(&inp->in6p_laddr)) { 751 /* 752 * when remote addr is an IPv4-mapped address, 753 * local addr should not be an IPv6 address, 754 * since you cannot determine how to map IPv6 755 * source address to IPv4. 756 */ 757 error = EINVAL; 758 goto release; 759 } 760 761 af = AF_INET; 762 } 763 764 if (!IN6_IS_ADDR_V4MAPPED(faddr)) { 765 error = in6_selectsrc_socket(sin6, optp, inp, 766 td->td_ucred, scope_ambiguous, &in6a, NULL); 767 if (error) 768 goto release; 769 laddr = &in6a; 770 } else 771 laddr = &inp->in6p_laddr; /* XXX */ 772 if (laddr == NULL) { 773 if (error == 0) 774 error = EADDRNOTAVAIL; 775 goto release; 776 } 777 if (inp->inp_lport == 0 && 778 (error = in6_pcbsetport(laddr, inp, td->td_ucred)) != 0) { 779 /* Undo an address bind that may have occurred. */ 780 inp->in6p_laddr = in6addr_any; 781 goto release; 782 } 783 } else { 784 if (IN6_IS_ADDR_UNSPECIFIED(&inp->in6p_faddr)) { 785 error = ENOTCONN; 786 goto release; 787 } 788 if (IN6_IS_ADDR_V4MAPPED(&inp->in6p_faddr)) { 789 if ((inp->inp_flags & IN6P_IPV6_V6ONLY)) { 790 /* 791 * XXX: this case would happen when the 792 * application sets the V6ONLY flag after 793 * connecting the foreign address. 794 * Such applications should be fixed, 795 * so we bark here. 796 */ 797 log(LOG_INFO, "udp6_output: IPV6_V6ONLY " 798 "option was set for a connected socket\n"); 799 error = EINVAL; 800 goto release; 801 } else 802 af = AF_INET; 803 } 804 laddr = &inp->in6p_laddr; 805 faddr = &inp->in6p_faddr; 806 fport = inp->inp_fport; 807 } 808 809 if (af == AF_INET) 810 hlen = sizeof(struct ip); 811 812 /* 813 * Calculate data length and get a mbuf 814 * for UDP and IP6 headers. 815 */ 816 M_PREPEND(m, hlen + sizeof(struct udphdr), M_NOWAIT); 817 if (m == NULL) { 818 error = ENOBUFS; 819 goto release; 820 } 821 822 /* 823 * Stuff checksum and output datagram. 824 */ 825 udp6 = (struct udphdr *)(mtod(m, caddr_t) + hlen); 826 udp6->uh_sport = inp->inp_lport; /* lport is always set in the PCB */ 827 udp6->uh_dport = fport; 828 if (nxt == IPPROTO_UDPLITE) { 829 struct udpcb *up; 830 831 up = intoudpcb(inp); 832 cscov = up->u_txcslen; 833 if (cscov >= plen) 834 cscov = 0; 835 udp6->uh_ulen = htons(cscov); 836 /* 837 * For UDP-Lite, checksum coverage length of zero means 838 * the entire UDPLite packet is covered by the checksum. 839 */ 840 cscov_partial = (cscov == 0) ? 0 : 1; 841 } else if (plen <= 0xffff) 842 udp6->uh_ulen = htons((u_short)plen); 843 else 844 udp6->uh_ulen = 0; 845 udp6->uh_sum = 0; 846 847 switch (af) { 848 case AF_INET6: 849 ip6 = mtod(m, struct ip6_hdr *); 850 ip6->ip6_flow = inp->inp_flow & IPV6_FLOWINFO_MASK; 851 ip6->ip6_vfc &= ~IPV6_VERSION_MASK; 852 ip6->ip6_vfc |= IPV6_VERSION; 853 ip6->ip6_plen = htons((u_short)plen); 854 ip6->ip6_nxt = nxt; 855 ip6->ip6_hlim = in6_selecthlim(inp, NULL); 856 ip6->ip6_src = *laddr; 857 ip6->ip6_dst = *faddr; 858 859 if (cscov_partial) { 860 if ((udp6->uh_sum = in6_cksum_partial(m, nxt, 861 sizeof(struct ip6_hdr), plen, cscov)) == 0) 862 udp6->uh_sum = 0xffff; 863 } else { 864 udp6->uh_sum = in6_cksum_pseudo(ip6, plen, nxt, 0); 865 m->m_pkthdr.csum_flags = CSUM_UDP_IPV6; 866 m->m_pkthdr.csum_data = offsetof(struct udphdr, uh_sum); 867 } 868 869 #ifdef RSS 870 { 871 uint32_t hash_val, hash_type; 872 uint8_t pr; 873 874 pr = inp->inp_socket->so_proto->pr_protocol; 875 /* 876 * Calculate an appropriate RSS hash for UDP and 877 * UDP Lite. 878 * 879 * The called function will take care of figuring out 880 * whether a 2-tuple or 4-tuple hash is required based 881 * on the currently configured scheme. 882 * 883 * Later later on connected socket values should be 884 * cached in the inpcb and reused, rather than constantly 885 * re-calculating it. 886 * 887 * UDP Lite is a different protocol number and will 888 * likely end up being hashed as a 2-tuple until 889 * RSS / NICs grow UDP Lite protocol awareness. 890 */ 891 if (rss_proto_software_hash_v6(faddr, laddr, fport, 892 inp->inp_lport, pr, &hash_val, &hash_type) == 0) { 893 m->m_pkthdr.flowid = hash_val; 894 M_HASHTYPE_SET(m, hash_type); 895 } 896 } 897 #endif 898 flags = 0; 899 #ifdef RSS 900 /* 901 * Don't override with the inp cached flowid. 902 * 903 * Until the whole UDP path is vetted, it may actually 904 * be incorrect. 905 */ 906 flags |= IP_NODEFAULTFLOWID; 907 #endif 908 909 UDP_PROBE(send, NULL, inp, ip6, inp, udp6); 910 UDPSTAT_INC(udps_opackets); 911 error = ip6_output(m, optp, &inp->inp_route6, flags, 912 inp->in6p_moptions, NULL, inp); 913 break; 914 case AF_INET: 915 error = EAFNOSUPPORT; 916 goto release; 917 } 918 goto releaseopt; 919 920 release: 921 m_freem(m); 922 923 releaseopt: 924 if (control) { 925 ip6_clearpktopts(&opt, -1); 926 m_freem(control); 927 } 928 return (error); 929 } 930 931 static void 932 udp6_abort(struct socket *so) 933 { 934 struct inpcb *inp; 935 struct inpcbinfo *pcbinfo; 936 937 pcbinfo = udp_get_inpcbinfo(so->so_proto->pr_protocol); 938 inp = sotoinpcb(so); 939 KASSERT(inp != NULL, ("udp6_abort: inp == NULL")); 940 941 INP_WLOCK(inp); 942 #ifdef INET 943 if (inp->inp_vflag & INP_IPV4) { 944 struct pr_usrreqs *pru; 945 uint8_t nxt; 946 947 nxt = (inp->inp_socket->so_proto->pr_protocol == IPPROTO_UDP) ? 948 IPPROTO_UDP : IPPROTO_UDPLITE; 949 INP_WUNLOCK(inp); 950 pru = inetsw[ip_protox[nxt]].pr_usrreqs; 951 (*pru->pru_abort)(so); 952 return; 953 } 954 #endif 955 956 if (!IN6_IS_ADDR_UNSPECIFIED(&inp->in6p_faddr)) { 957 INP_HASH_WLOCK(pcbinfo); 958 in6_pcbdisconnect(inp); 959 inp->in6p_laddr = in6addr_any; 960 INP_HASH_WUNLOCK(pcbinfo); 961 soisdisconnected(so); 962 } 963 INP_WUNLOCK(inp); 964 } 965 966 static int 967 udp6_attach(struct socket *so, int proto, struct thread *td) 968 { 969 struct inpcb *inp; 970 struct inpcbinfo *pcbinfo; 971 int error; 972 973 pcbinfo = udp_get_inpcbinfo(so->so_proto->pr_protocol); 974 inp = sotoinpcb(so); 975 KASSERT(inp == NULL, ("udp6_attach: inp != NULL")); 976 977 if (so->so_snd.sb_hiwat == 0 || so->so_rcv.sb_hiwat == 0) { 978 error = soreserve(so, udp_sendspace, udp_recvspace); 979 if (error) 980 return (error); 981 } 982 INP_INFO_WLOCK(pcbinfo); 983 error = in_pcballoc(so, pcbinfo); 984 if (error) { 985 INP_INFO_WUNLOCK(pcbinfo); 986 return (error); 987 } 988 inp = (struct inpcb *)so->so_pcb; 989 inp->inp_vflag |= INP_IPV6; 990 if ((inp->inp_flags & IN6P_IPV6_V6ONLY) == 0) 991 inp->inp_vflag |= INP_IPV4; 992 inp->in6p_hops = -1; /* use kernel default */ 993 inp->in6p_cksum = -1; /* just to be sure */ 994 /* 995 * XXX: ugly!! 996 * IPv4 TTL initialization is necessary for an IPv6 socket as well, 997 * because the socket may be bound to an IPv6 wildcard address, 998 * which may match an IPv4-mapped IPv6 address. 999 */ 1000 inp->inp_ip_ttl = V_ip_defttl; 1001 1002 error = udp_newudpcb(inp); 1003 if (error) { 1004 in_pcbdetach(inp); 1005 in_pcbfree(inp); 1006 INP_INFO_WUNLOCK(pcbinfo); 1007 return (error); 1008 } 1009 INP_WUNLOCK(inp); 1010 INP_INFO_WUNLOCK(pcbinfo); 1011 return (0); 1012 } 1013 1014 static int 1015 udp6_bind(struct socket *so, struct sockaddr *nam, struct thread *td) 1016 { 1017 struct inpcb *inp; 1018 struct inpcbinfo *pcbinfo; 1019 int error; 1020 1021 pcbinfo = udp_get_inpcbinfo(so->so_proto->pr_protocol); 1022 inp = sotoinpcb(so); 1023 KASSERT(inp != NULL, ("udp6_bind: inp == NULL")); 1024 1025 INP_WLOCK(inp); 1026 INP_HASH_WLOCK(pcbinfo); 1027 inp->inp_vflag &= ~INP_IPV4; 1028 inp->inp_vflag |= INP_IPV6; 1029 if ((inp->inp_flags & IN6P_IPV6_V6ONLY) == 0) { 1030 struct sockaddr_in6 *sin6_p; 1031 1032 sin6_p = (struct sockaddr_in6 *)nam; 1033 1034 if (IN6_IS_ADDR_UNSPECIFIED(&sin6_p->sin6_addr)) 1035 inp->inp_vflag |= INP_IPV4; 1036 #ifdef INET 1037 else if (IN6_IS_ADDR_V4MAPPED(&sin6_p->sin6_addr)) { 1038 struct sockaddr_in sin; 1039 1040 in6_sin6_2_sin(&sin, sin6_p); 1041 inp->inp_vflag |= INP_IPV4; 1042 inp->inp_vflag &= ~INP_IPV6; 1043 error = in_pcbbind(inp, (struct sockaddr *)&sin, 1044 td->td_ucred); 1045 goto out; 1046 } 1047 #endif 1048 } 1049 1050 error = in6_pcbbind(inp, nam, td->td_ucred); 1051 #ifdef INET 1052 out: 1053 #endif 1054 INP_HASH_WUNLOCK(pcbinfo); 1055 INP_WUNLOCK(inp); 1056 return (error); 1057 } 1058 1059 static void 1060 udp6_close(struct socket *so) 1061 { 1062 struct inpcb *inp; 1063 struct inpcbinfo *pcbinfo; 1064 1065 pcbinfo = udp_get_inpcbinfo(so->so_proto->pr_protocol); 1066 inp = sotoinpcb(so); 1067 KASSERT(inp != NULL, ("udp6_close: inp == NULL")); 1068 1069 INP_WLOCK(inp); 1070 #ifdef INET 1071 if (inp->inp_vflag & INP_IPV4) { 1072 struct pr_usrreqs *pru; 1073 uint8_t nxt; 1074 1075 nxt = (inp->inp_socket->so_proto->pr_protocol == IPPROTO_UDP) ? 1076 IPPROTO_UDP : IPPROTO_UDPLITE; 1077 INP_WUNLOCK(inp); 1078 pru = inetsw[ip_protox[nxt]].pr_usrreqs; 1079 (*pru->pru_disconnect)(so); 1080 return; 1081 } 1082 #endif 1083 if (!IN6_IS_ADDR_UNSPECIFIED(&inp->in6p_faddr)) { 1084 INP_HASH_WLOCK(pcbinfo); 1085 in6_pcbdisconnect(inp); 1086 inp->in6p_laddr = in6addr_any; 1087 INP_HASH_WUNLOCK(pcbinfo); 1088 soisdisconnected(so); 1089 } 1090 INP_WUNLOCK(inp); 1091 } 1092 1093 static int 1094 udp6_connect(struct socket *so, struct sockaddr *nam, struct thread *td) 1095 { 1096 struct inpcb *inp; 1097 struct inpcbinfo *pcbinfo; 1098 struct sockaddr_in6 *sin6; 1099 int error; 1100 1101 pcbinfo = udp_get_inpcbinfo(so->so_proto->pr_protocol); 1102 inp = sotoinpcb(so); 1103 sin6 = (struct sockaddr_in6 *)nam; 1104 KASSERT(inp != NULL, ("udp6_connect: inp == NULL")); 1105 1106 /* 1107 * XXXRW: Need to clarify locking of v4/v6 flags. 1108 */ 1109 INP_WLOCK(inp); 1110 #ifdef INET 1111 if (IN6_IS_ADDR_V4MAPPED(&sin6->sin6_addr)) { 1112 struct sockaddr_in sin; 1113 1114 if ((inp->inp_flags & IN6P_IPV6_V6ONLY) != 0) { 1115 error = EINVAL; 1116 goto out; 1117 } 1118 if ((inp->inp_vflag & INP_IPV4) == 0) { 1119 error = EAFNOSUPPORT; 1120 goto out; 1121 } 1122 if (inp->inp_faddr.s_addr != INADDR_ANY) { 1123 error = EISCONN; 1124 goto out; 1125 } 1126 in6_sin6_2_sin(&sin, sin6); 1127 inp->inp_vflag |= INP_IPV4; 1128 inp->inp_vflag &= ~INP_IPV6; 1129 error = prison_remote_ip4(td->td_ucred, &sin.sin_addr); 1130 if (error != 0) 1131 goto out; 1132 INP_HASH_WLOCK(pcbinfo); 1133 error = in_pcbconnect(inp, (struct sockaddr *)&sin, 1134 td->td_ucred); 1135 INP_HASH_WUNLOCK(pcbinfo); 1136 if (error == 0) 1137 soisconnected(so); 1138 goto out; 1139 } else { 1140 if ((inp->inp_vflag & INP_IPV6) == 0) { 1141 error = EAFNOSUPPORT; 1142 goto out; 1143 } 1144 } 1145 #endif 1146 if (!IN6_IS_ADDR_UNSPECIFIED(&inp->in6p_faddr)) { 1147 error = EISCONN; 1148 goto out; 1149 } 1150 inp->inp_vflag &= ~INP_IPV4; 1151 inp->inp_vflag |= INP_IPV6; 1152 error = prison_remote_ip6(td->td_ucred, &sin6->sin6_addr); 1153 if (error != 0) 1154 goto out; 1155 INP_HASH_WLOCK(pcbinfo); 1156 error = in6_pcbconnect(inp, nam, td->td_ucred); 1157 INP_HASH_WUNLOCK(pcbinfo); 1158 if (error == 0) 1159 soisconnected(so); 1160 out: 1161 INP_WUNLOCK(inp); 1162 return (error); 1163 } 1164 1165 static void 1166 udp6_detach(struct socket *so) 1167 { 1168 struct inpcb *inp; 1169 struct inpcbinfo *pcbinfo; 1170 struct udpcb *up; 1171 1172 pcbinfo = udp_get_inpcbinfo(so->so_proto->pr_protocol); 1173 inp = sotoinpcb(so); 1174 KASSERT(inp != NULL, ("udp6_detach: inp == NULL")); 1175 1176 INP_INFO_WLOCK(pcbinfo); 1177 INP_WLOCK(inp); 1178 up = intoudpcb(inp); 1179 KASSERT(up != NULL, ("%s: up == NULL", __func__)); 1180 in_pcbdetach(inp); 1181 in_pcbfree(inp); 1182 INP_INFO_WUNLOCK(pcbinfo); 1183 udp_discardcb(up); 1184 } 1185 1186 static int 1187 udp6_disconnect(struct socket *so) 1188 { 1189 struct inpcb *inp; 1190 struct inpcbinfo *pcbinfo; 1191 int error; 1192 1193 pcbinfo = udp_get_inpcbinfo(so->so_proto->pr_protocol); 1194 inp = sotoinpcb(so); 1195 KASSERT(inp != NULL, ("udp6_disconnect: inp == NULL")); 1196 1197 INP_WLOCK(inp); 1198 #ifdef INET 1199 if (inp->inp_vflag & INP_IPV4) { 1200 struct pr_usrreqs *pru; 1201 uint8_t nxt; 1202 1203 nxt = (inp->inp_socket->so_proto->pr_protocol == IPPROTO_UDP) ? 1204 IPPROTO_UDP : IPPROTO_UDPLITE; 1205 INP_WUNLOCK(inp); 1206 pru = inetsw[ip_protox[nxt]].pr_usrreqs; 1207 (void)(*pru->pru_disconnect)(so); 1208 return (0); 1209 } 1210 #endif 1211 1212 if (IN6_IS_ADDR_UNSPECIFIED(&inp->in6p_faddr)) { 1213 error = ENOTCONN; 1214 goto out; 1215 } 1216 1217 INP_HASH_WLOCK(pcbinfo); 1218 in6_pcbdisconnect(inp); 1219 inp->in6p_laddr = in6addr_any; 1220 INP_HASH_WUNLOCK(pcbinfo); 1221 SOCK_LOCK(so); 1222 so->so_state &= ~SS_ISCONNECTED; /* XXX */ 1223 SOCK_UNLOCK(so); 1224 out: 1225 INP_WUNLOCK(inp); 1226 return (0); 1227 } 1228 1229 static int 1230 udp6_send(struct socket *so, int flags, struct mbuf *m, 1231 struct sockaddr *addr, struct mbuf *control, struct thread *td) 1232 { 1233 struct inpcb *inp; 1234 struct inpcbinfo *pcbinfo; 1235 int error = 0; 1236 1237 pcbinfo = udp_get_inpcbinfo(so->so_proto->pr_protocol); 1238 inp = sotoinpcb(so); 1239 KASSERT(inp != NULL, ("udp6_send: inp == NULL")); 1240 1241 INP_WLOCK(inp); 1242 if (addr) { 1243 if (addr->sa_len != sizeof(struct sockaddr_in6)) { 1244 error = EINVAL; 1245 goto bad; 1246 } 1247 if (addr->sa_family != AF_INET6) { 1248 error = EAFNOSUPPORT; 1249 goto bad; 1250 } 1251 } 1252 1253 #ifdef INET 1254 if ((inp->inp_flags & IN6P_IPV6_V6ONLY) == 0) { 1255 int hasv4addr; 1256 struct sockaddr_in6 *sin6 = NULL; 1257 1258 if (addr == NULL) 1259 hasv4addr = (inp->inp_vflag & INP_IPV4); 1260 else { 1261 sin6 = (struct sockaddr_in6 *)addr; 1262 hasv4addr = IN6_IS_ADDR_V4MAPPED(&sin6->sin6_addr) 1263 ? 1 : 0; 1264 } 1265 if (hasv4addr) { 1266 struct pr_usrreqs *pru; 1267 uint8_t nxt; 1268 1269 nxt = (inp->inp_socket->so_proto->pr_protocol == 1270 IPPROTO_UDP) ? IPPROTO_UDP : IPPROTO_UDPLITE; 1271 /* 1272 * XXXRW: We release UDP-layer locks before calling 1273 * udp_send() in order to avoid recursion. However, 1274 * this does mean there is a short window where inp's 1275 * fields are unstable. Could this lead to a 1276 * potential race in which the factors causing us to 1277 * select the UDPv4 output routine are invalidated? 1278 */ 1279 INP_WUNLOCK(inp); 1280 if (sin6) 1281 in6_sin6_2_sin_in_sock(addr); 1282 pru = inetsw[ip_protox[nxt]].pr_usrreqs; 1283 /* addr will just be freed in sendit(). */ 1284 return ((*pru->pru_send)(so, flags, m, addr, control, 1285 td)); 1286 } 1287 } 1288 #endif 1289 #ifdef MAC 1290 mac_inpcb_create_mbuf(inp, m); 1291 #endif 1292 INP_HASH_WLOCK(pcbinfo); 1293 error = udp6_output(inp, m, addr, control, td); 1294 INP_HASH_WUNLOCK(pcbinfo); 1295 INP_WUNLOCK(inp); 1296 return (error); 1297 1298 bad: 1299 INP_WUNLOCK(inp); 1300 m_freem(m); 1301 return (error); 1302 } 1303 1304 struct pr_usrreqs udp6_usrreqs = { 1305 .pru_abort = udp6_abort, 1306 .pru_attach = udp6_attach, 1307 .pru_bind = udp6_bind, 1308 .pru_connect = udp6_connect, 1309 .pru_control = in6_control, 1310 .pru_detach = udp6_detach, 1311 .pru_disconnect = udp6_disconnect, 1312 .pru_peeraddr = in6_mapped_peeraddr, 1313 .pru_send = udp6_send, 1314 .pru_shutdown = udp_shutdown, 1315 .pru_sockaddr = in6_mapped_sockaddr, 1316 .pru_soreceive = soreceive_dgram, 1317 .pru_sosend = sosend_dgram, 1318 .pru_sosetlabel = in_pcbsosetlabel, 1319 .pru_close = udp6_close 1320 }; 1321