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sys/netinet6/udp6_usrreq.c
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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 * 4. 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; 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, 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 m_adj(n, off + sizeof(struct udphdr)); 175 176 so = inp->inp_socket; 177 SOCKBUF_LOCK(&so->so_rcv); 178 if (sbappendaddr_locked(&so->so_rcv, (struct sockaddr *)fromsa, n, 179 opts) == 0) { 180 SOCKBUF_UNLOCK(&so->so_rcv); 181 m_freem(n); 182 if (opts) 183 m_freem(opts); 184 UDPSTAT_INC(udps_fullsock); 185 } else 186 sorwakeup_locked(so); 187 return (0); 188 } 189 190 int 191 udp6_input(struct mbuf **mp, int *offp, int proto) 192 { 193 struct mbuf *m = *mp; 194 struct ifnet *ifp; 195 struct ip6_hdr *ip6; 196 struct udphdr *uh; 197 struct inpcb *inp; 198 struct inpcbinfo *pcbinfo; 199 struct udpcb *up; 200 int off = *offp; 201 int cscov_partial; 202 int plen, ulen; 203 struct sockaddr_in6 fromsa; 204 struct m_tag *fwd_tag; 205 uint16_t uh_sum; 206 uint8_t nxt; 207 208 ifp = m->m_pkthdr.rcvif; 209 210 #ifndef PULLDOWN_TEST 211 IP6_EXTHDR_CHECK(m, off, sizeof(struct udphdr), IPPROTO_DONE); 212 ip6 = mtod(m, struct ip6_hdr *); 213 uh = (struct udphdr *)((caddr_t)ip6 + off); 214 #else 215 IP6_EXTHDR_GET(uh, struct udphdr *, m, off, sizeof(*uh)); 216 if (!uh) 217 return (IPPROTO_DONE); 218 ip6 = mtod(m, struct ip6_hdr *); 219 #endif 220 221 UDPSTAT_INC(udps_ipackets); 222 223 /* 224 * Destination port of 0 is illegal, based on RFC768. 225 */ 226 if (uh->uh_dport == 0) 227 goto badunlocked; 228 229 plen = ntohs(ip6->ip6_plen) - off + sizeof(*ip6); 230 ulen = ntohs((u_short)uh->uh_ulen); 231 232 nxt = proto; 233 cscov_partial = (nxt == IPPROTO_UDPLITE) ? 1 : 0; 234 if (nxt == IPPROTO_UDPLITE) { 235 /* Zero means checksum over the complete packet. */ 236 if (ulen == 0) 237 ulen = plen; 238 if (ulen == plen) 239 cscov_partial = 0; 240 if ((ulen < sizeof(struct udphdr)) || (ulen > plen)) { 241 /* XXX: What is the right UDPLite MIB counter? */ 242 goto badunlocked; 243 } 244 if (uh->uh_sum == 0) { 245 /* XXX: What is the right UDPLite MIB counter? */ 246 goto badunlocked; 247 } 248 } else { 249 if ((ulen < sizeof(struct udphdr)) || (plen != ulen)) { 250 UDPSTAT_INC(udps_badlen); 251 goto badunlocked; 252 } 253 if (uh->uh_sum == 0) { 254 UDPSTAT_INC(udps_nosum); 255 goto badunlocked; 256 } 257 } 258 259 if ((m->m_pkthdr.csum_flags & CSUM_DATA_VALID_IPV6) && 260 !cscov_partial) { 261 if (m->m_pkthdr.csum_flags & CSUM_PSEUDO_HDR) 262 uh_sum = m->m_pkthdr.csum_data; 263 else 264 uh_sum = in6_cksum_pseudo(ip6, ulen, nxt, 265 m->m_pkthdr.csum_data); 266 uh_sum ^= 0xffff; 267 } else 268 uh_sum = in6_cksum_partial(m, nxt, off, plen, ulen); 269 270 if (uh_sum != 0) { 271 UDPSTAT_INC(udps_badsum); 272 goto badunlocked; 273 } 274 275 /* 276 * Construct sockaddr format source address. 277 */ 278 init_sin6(&fromsa, m); 279 fromsa.sin6_port = uh->uh_sport; 280 281 pcbinfo = udp_get_inpcbinfo(nxt); 282 if (IN6_IS_ADDR_MULTICAST(&ip6->ip6_dst)) { 283 struct inpcb *last; 284 struct inpcbhead *pcblist; 285 struct ip6_moptions *imo; 286 287 INP_INFO_RLOCK(pcbinfo); 288 /* 289 * In the event that laddr should be set to the link-local 290 * address (this happens in RIPng), the multicast address 291 * specified in the received packet will not match laddr. To 292 * handle this situation, matching is relaxed if the 293 * receiving interface is the same as one specified in the 294 * socket and if the destination multicast address matches 295 * one of the multicast groups specified in the socket. 296 */ 297 298 /* 299 * KAME note: traditionally we dropped udpiphdr from mbuf 300 * here. We need udphdr for IPsec processing so we do that 301 * later. 302 */ 303 pcblist = udp_get_pcblist(nxt); 304 last = NULL; 305 LIST_FOREACH(inp, pcblist, inp_list) { 306 if ((inp->inp_vflag & INP_IPV6) == 0) 307 continue; 308 if (inp->inp_lport != uh->uh_dport) 309 continue; 310 if (inp->inp_fport != 0 && 311 inp->inp_fport != uh->uh_sport) 312 continue; 313 if (!IN6_IS_ADDR_UNSPECIFIED(&inp->in6p_laddr)) { 314 if (!IN6_ARE_ADDR_EQUAL(&inp->in6p_laddr, 315 &ip6->ip6_dst)) 316 continue; 317 } 318 if (!IN6_IS_ADDR_UNSPECIFIED(&inp->in6p_faddr)) { 319 if (!IN6_ARE_ADDR_EQUAL(&inp->in6p_faddr, 320 &ip6->ip6_src) || 321 inp->inp_fport != uh->uh_sport) 322 continue; 323 } 324 325 /* 326 * XXXRW: Because we weren't holding either the inpcb 327 * or the hash lock when we checked for a match 328 * before, we should probably recheck now that the 329 * inpcb lock is (supposed to be) held. 330 */ 331 332 /* 333 * Handle socket delivery policy for any-source 334 * and source-specific multicast. [RFC3678] 335 */ 336 imo = inp->in6p_moptions; 337 if (imo && IN6_IS_ADDR_MULTICAST(&ip6->ip6_dst)) { 338 struct sockaddr_in6 mcaddr; 339 int blocked; 340 341 INP_RLOCK(inp); 342 343 bzero(&mcaddr, sizeof(struct sockaddr_in6)); 344 mcaddr.sin6_len = sizeof(struct sockaddr_in6); 345 mcaddr.sin6_family = AF_INET6; 346 mcaddr.sin6_addr = ip6->ip6_dst; 347 348 blocked = im6o_mc_filter(imo, ifp, 349 (struct sockaddr *)&mcaddr, 350 (struct sockaddr *)&fromsa); 351 if (blocked != MCAST_PASS) { 352 if (blocked == MCAST_NOTGMEMBER) 353 IP6STAT_INC(ip6s_notmember); 354 if (blocked == MCAST_NOTSMEMBER || 355 blocked == MCAST_MUTED) 356 UDPSTAT_INC(udps_filtermcast); 357 INP_RUNLOCK(inp); /* XXX */ 358 continue; 359 } 360 361 INP_RUNLOCK(inp); 362 } 363 if (last != NULL) { 364 struct mbuf *n; 365 366 if ((n = m_copy(m, 0, M_COPYALL)) != NULL) { 367 INP_RLOCK(last); 368 UDP_PROBE(receive, NULL, last, ip6, 369 last, uh); 370 if (udp6_append(last, n, off, &fromsa)) 371 goto inp_lost; 372 INP_RUNLOCK(last); 373 } 374 } 375 last = inp; 376 /* 377 * Don't look for additional matches if this one does 378 * not have either the SO_REUSEPORT or SO_REUSEADDR 379 * socket options set. This heuristic avoids 380 * searching through all pcbs in the common case of a 381 * non-shared port. It assumes that an application 382 * will never clear these options after setting them. 383 */ 384 if ((last->inp_socket->so_options & 385 (SO_REUSEPORT|SO_REUSEADDR)) == 0) 386 break; 387 } 388 389 if (last == NULL) { 390 /* 391 * No matching pcb found; discard datagram. (No need 392 * to send an ICMP Port Unreachable for a broadcast 393 * or multicast datgram.) 394 */ 395 UDPSTAT_INC(udps_noport); 396 UDPSTAT_INC(udps_noportmcast); 397 goto badheadlocked; 398 } 399 INP_RLOCK(last); 400 INP_INFO_RUNLOCK(pcbinfo); 401 UDP_PROBE(receive, NULL, last, ip6, last, uh); 402 if (udp6_append(last, m, off, &fromsa) == 0) 403 INP_RUNLOCK(last); 404 inp_lost: 405 return (IPPROTO_DONE); 406 } 407 /* 408 * Locate pcb for datagram. 409 */ 410 411 /* 412 * Grab info from PACKET_TAG_IPFORWARD tag prepended to the chain. 413 */ 414 if ((m->m_flags & M_IP6_NEXTHOP) && 415 (fwd_tag = m_tag_find(m, PACKET_TAG_IPFORWARD, NULL)) != NULL) { 416 struct sockaddr_in6 *next_hop6; 417 418 next_hop6 = (struct sockaddr_in6 *)(fwd_tag + 1); 419 420 /* 421 * Transparently forwarded. Pretend to be the destination. 422 * Already got one like this? 423 */ 424 inp = in6_pcblookup_mbuf(pcbinfo, &ip6->ip6_src, 425 uh->uh_sport, &ip6->ip6_dst, uh->uh_dport, 426 INPLOOKUP_RLOCKPCB, m->m_pkthdr.rcvif, m); 427 if (!inp) { 428 /* 429 * It's new. Try to find the ambushing socket. 430 * Because we've rewritten the destination address, 431 * any hardware-generated hash is ignored. 432 */ 433 inp = in6_pcblookup(pcbinfo, &ip6->ip6_src, 434 uh->uh_sport, &next_hop6->sin6_addr, 435 next_hop6->sin6_port ? htons(next_hop6->sin6_port) : 436 uh->uh_dport, INPLOOKUP_WILDCARD | 437 INPLOOKUP_RLOCKPCB, m->m_pkthdr.rcvif); 438 } 439 /* Remove the tag from the packet. We don't need it anymore. */ 440 m_tag_delete(m, fwd_tag); 441 m->m_flags &= ~M_IP6_NEXTHOP; 442 } else 443 inp = in6_pcblookup_mbuf(pcbinfo, &ip6->ip6_src, 444 uh->uh_sport, &ip6->ip6_dst, uh->uh_dport, 445 INPLOOKUP_WILDCARD | INPLOOKUP_RLOCKPCB, 446 m->m_pkthdr.rcvif, m); 447 if (inp == NULL) { 448 if (udp_log_in_vain) { 449 char ip6bufs[INET6_ADDRSTRLEN]; 450 char ip6bufd[INET6_ADDRSTRLEN]; 451 452 log(LOG_INFO, 453 "Connection attempt to UDP [%s]:%d from [%s]:%d\n", 454 ip6_sprintf(ip6bufd, &ip6->ip6_dst), 455 ntohs(uh->uh_dport), 456 ip6_sprintf(ip6bufs, &ip6->ip6_src), 457 ntohs(uh->uh_sport)); 458 } 459 UDP_PROBE(receive, NULL, NULL, ip6, NULL, uh); 460 UDPSTAT_INC(udps_noport); 461 if (m->m_flags & M_MCAST) { 462 printf("UDP6: M_MCAST is set in a unicast packet.\n"); 463 UDPSTAT_INC(udps_noportmcast); 464 goto badunlocked; 465 } 466 if (V_udp_blackhole) 467 goto badunlocked; 468 icmp6_error(m, ICMP6_DST_UNREACH, ICMP6_DST_UNREACH_NOPORT, 0); 469 return (IPPROTO_DONE); 470 } 471 INP_RLOCK_ASSERT(inp); 472 up = intoudpcb(inp); 473 if (cscov_partial) { 474 if (up->u_rxcslen == 0 || up->u_rxcslen > ulen) { 475 INP_RUNLOCK(inp); 476 m_freem(m); 477 return (IPPROTO_DONE); 478 } 479 } 480 UDP_PROBE(receive, NULL, inp, ip6, inp, uh); 481 if (udp6_append(inp, m, off, &fromsa) == 0) 482 INP_RUNLOCK(inp); 483 return (IPPROTO_DONE); 484 485 badheadlocked: 486 INP_INFO_RUNLOCK(pcbinfo); 487 badunlocked: 488 if (m) 489 m_freem(m); 490 return (IPPROTO_DONE); 491 } 492 493 static void 494 udp6_common_ctlinput(int cmd, struct sockaddr *sa, void *d, 495 struct inpcbinfo *pcbinfo) 496 { 497 struct udphdr uh; 498 struct ip6_hdr *ip6; 499 struct mbuf *m; 500 int off = 0; 501 struct ip6ctlparam *ip6cp = NULL; 502 const struct sockaddr_in6 *sa6_src = NULL; 503 void *cmdarg; 504 struct inpcb *(*notify)(struct inpcb *, int) = udp_notify; 505 struct udp_portonly { 506 u_int16_t uh_sport; 507 u_int16_t uh_dport; 508 } *uhp; 509 510 if (sa->sa_family != AF_INET6 || 511 sa->sa_len != sizeof(struct sockaddr_in6)) 512 return; 513 514 if ((unsigned)cmd >= PRC_NCMDS) 515 return; 516 if (PRC_IS_REDIRECT(cmd)) 517 notify = in6_rtchange, d = NULL; 518 else if (cmd == PRC_HOSTDEAD) 519 d = NULL; 520 else if (inet6ctlerrmap[cmd] == 0) 521 return; 522 523 /* if the parameter is from icmp6, decode it. */ 524 if (d != NULL) { 525 ip6cp = (struct ip6ctlparam *)d; 526 m = ip6cp->ip6c_m; 527 ip6 = ip6cp->ip6c_ip6; 528 off = ip6cp->ip6c_off; 529 cmdarg = ip6cp->ip6c_cmdarg; 530 sa6_src = ip6cp->ip6c_src; 531 } else { 532 m = NULL; 533 ip6 = NULL; 534 cmdarg = NULL; 535 sa6_src = &sa6_any; 536 } 537 538 if (ip6) { 539 /* 540 * XXX: We assume that when IPV6 is non NULL, 541 * M and OFF are valid. 542 */ 543 544 /* Check if we can safely examine src and dst ports. */ 545 if (m->m_pkthdr.len < off + sizeof(*uhp)) 546 return; 547 548 bzero(&uh, sizeof(uh)); 549 m_copydata(m, off, sizeof(*uhp), (caddr_t)&uh); 550 551 if (!PRC_IS_REDIRECT(cmd)) { 552 /* Check to see if its tunneled */ 553 struct inpcb *inp; 554 inp = in6_pcblookup_mbuf(pcbinfo, &ip6->ip6_dst, 555 uh.uh_dport, &ip6->ip6_src, uh.uh_sport, 556 INPLOOKUP_WILDCARD | INPLOOKUP_RLOCKPCB, 557 m->m_pkthdr.rcvif, m); 558 if (inp != NULL) { 559 struct udpcb *up; 560 561 up = intoudpcb(inp); 562 if (up->u_icmp_func) { 563 /* Yes it is. */ 564 INP_RUNLOCK(inp); 565 (*up->u_icmp_func)(cmd, (struct sockaddr *)ip6cp->ip6c_src, 566 d, up->u_tun_ctx); 567 return; 568 } else { 569 /* Can't find it. */ 570 INP_RUNLOCK(inp); 571 } 572 } 573 } 574 (void)in6_pcbnotify(pcbinfo, sa, uh.uh_dport, 575 (struct sockaddr *)ip6cp->ip6c_src, uh.uh_sport, cmd, 576 cmdarg, notify); 577 } else 578 (void)in6_pcbnotify(pcbinfo, sa, 0, 579 (const struct sockaddr *)sa6_src, 0, cmd, cmdarg, notify); 580 } 581 582 void 583 udp6_ctlinput(int cmd, struct sockaddr *sa, void *d) 584 { 585 586 return (udp6_common_ctlinput(cmd, sa, d, &V_udbinfo)); 587 } 588 589 void 590 udplite6_ctlinput(int cmd, struct sockaddr *sa, void *d) 591 { 592 593 return (udp6_common_ctlinput(cmd, sa, d, &V_ulitecbinfo)); 594 } 595 596 static int 597 udp6_getcred(SYSCTL_HANDLER_ARGS) 598 { 599 struct xucred xuc; 600 struct sockaddr_in6 addrs[2]; 601 struct inpcb *inp; 602 int error; 603 604 error = priv_check(req->td, PRIV_NETINET_GETCRED); 605 if (error) 606 return (error); 607 608 if (req->newlen != sizeof(addrs)) 609 return (EINVAL); 610 if (req->oldlen != sizeof(struct xucred)) 611 return (EINVAL); 612 error = SYSCTL_IN(req, addrs, sizeof(addrs)); 613 if (error) 614 return (error); 615 if ((error = sa6_embedscope(&addrs[0], V_ip6_use_defzone)) != 0 || 616 (error = sa6_embedscope(&addrs[1], V_ip6_use_defzone)) != 0) { 617 return (error); 618 } 619 inp = in6_pcblookup(&V_udbinfo, &addrs[1].sin6_addr, 620 addrs[1].sin6_port, &addrs[0].sin6_addr, addrs[0].sin6_port, 621 INPLOOKUP_WILDCARD | INPLOOKUP_RLOCKPCB, NULL); 622 if (inp != NULL) { 623 INP_RLOCK_ASSERT(inp); 624 if (inp->inp_socket == NULL) 625 error = ENOENT; 626 if (error == 0) 627 error = cr_canseesocket(req->td->td_ucred, 628 inp->inp_socket); 629 if (error == 0) 630 cru2x(inp->inp_cred, &xuc); 631 INP_RUNLOCK(inp); 632 } else 633 error = ENOENT; 634 if (error == 0) 635 error = SYSCTL_OUT(req, &xuc, sizeof(struct xucred)); 636 return (error); 637 } 638 639 SYSCTL_PROC(_net_inet6_udp6, OID_AUTO, getcred, CTLTYPE_OPAQUE|CTLFLAG_RW, 0, 640 0, udp6_getcred, "S,xucred", "Get the xucred of a UDP6 connection"); 641 642 static int 643 udp6_output(struct inpcb *inp, struct mbuf *m, struct sockaddr *addr6, 644 struct mbuf *control, struct thread *td) 645 { 646 u_int32_t ulen = m->m_pkthdr.len; 647 u_int32_t plen = sizeof(struct udphdr) + ulen; 648 struct ip6_hdr *ip6; 649 struct udphdr *udp6; 650 struct in6_addr *laddr, *faddr, in6a; 651 struct sockaddr_in6 *sin6 = NULL; 652 int cscov_partial = 0; 653 int scope_ambiguous = 0; 654 u_short fport; 655 int error = 0; 656 uint8_t nxt; 657 uint16_t cscov = 0; 658 struct ip6_pktopts *optp, opt; 659 int af = AF_INET6, hlen = sizeof(struct ip6_hdr); 660 int flags; 661 struct sockaddr_in6 tmp; 662 663 INP_WLOCK_ASSERT(inp); 664 INP_HASH_WLOCK_ASSERT(inp->inp_pcbinfo); 665 666 if (addr6) { 667 /* addr6 has been validated in udp6_send(). */ 668 sin6 = (struct sockaddr_in6 *)addr6; 669 670 /* protect *sin6 from overwrites */ 671 tmp = *sin6; 672 sin6 = &tmp; 673 674 /* 675 * Application should provide a proper zone ID or the use of 676 * default zone IDs should be enabled. Unfortunately, some 677 * applications do not behave as it should, so we need a 678 * workaround. Even if an appropriate ID is not determined, 679 * we'll see if we can determine the outgoing interface. If we 680 * can, determine the zone ID based on the interface below. 681 */ 682 if (sin6->sin6_scope_id == 0 && !V_ip6_use_defzone) 683 scope_ambiguous = 1; 684 if ((error = sa6_embedscope(sin6, V_ip6_use_defzone)) != 0) 685 return (error); 686 } 687 688 nxt = (inp->inp_socket->so_proto->pr_protocol == IPPROTO_UDP) ? 689 IPPROTO_UDP : IPPROTO_UDPLITE; 690 if (control) { 691 if ((error = ip6_setpktopts(control, &opt, 692 inp->in6p_outputopts, td->td_ucred, nxt)) != 0) 693 goto release; 694 optp = &opt; 695 } else 696 optp = inp->in6p_outputopts; 697 698 if (sin6) { 699 faddr = &sin6->sin6_addr; 700 701 /* 702 * Since we saw no essential reason for calling in_pcbconnect, 703 * we get rid of such kind of logic, and call in6_selectsrc 704 * and in6_pcbsetport in order to fill in the local address 705 * and the local port. 706 */ 707 if (sin6->sin6_port == 0) { 708 error = EADDRNOTAVAIL; 709 goto release; 710 } 711 712 if (!IN6_IS_ADDR_UNSPECIFIED(&inp->in6p_faddr)) { 713 /* how about ::ffff:0.0.0.0 case? */ 714 error = EISCONN; 715 goto release; 716 } 717 718 fport = sin6->sin6_port; /* allow 0 port */ 719 720 if (IN6_IS_ADDR_V4MAPPED(faddr)) { 721 if ((inp->inp_flags & IN6P_IPV6_V6ONLY)) { 722 /* 723 * I believe we should explicitly discard the 724 * packet when mapped addresses are disabled, 725 * rather than send the packet as an IPv6 one. 726 * If we chose the latter approach, the packet 727 * might be sent out on the wire based on the 728 * default route, the situation which we'd 729 * probably want to avoid. 730 * (20010421 jinmei@kame.net) 731 */ 732 error = EINVAL; 733 goto release; 734 } 735 if (!IN6_IS_ADDR_UNSPECIFIED(&inp->in6p_laddr) && 736 !IN6_IS_ADDR_V4MAPPED(&inp->in6p_laddr)) { 737 /* 738 * when remote addr is an IPv4-mapped address, 739 * local addr should not be an IPv6 address, 740 * since you cannot determine how to map IPv6 741 * source address to IPv4. 742 */ 743 error = EINVAL; 744 goto release; 745 } 746 747 af = AF_INET; 748 } 749 750 if (!IN6_IS_ADDR_V4MAPPED(faddr)) { 751 error = in6_selectsrc_socket(sin6, optp, inp, 752 td->td_ucred, scope_ambiguous, &in6a, NULL); 753 if (error) 754 goto release; 755 laddr = &in6a; 756 } else 757 laddr = &inp->in6p_laddr; /* XXX */ 758 if (laddr == NULL) { 759 if (error == 0) 760 error = EADDRNOTAVAIL; 761 goto release; 762 } 763 if (inp->inp_lport == 0 && 764 (error = in6_pcbsetport(laddr, inp, td->td_ucred)) != 0) { 765 /* Undo an address bind that may have occurred. */ 766 inp->in6p_laddr = in6addr_any; 767 goto release; 768 } 769 } else { 770 if (IN6_IS_ADDR_UNSPECIFIED(&inp->in6p_faddr)) { 771 error = ENOTCONN; 772 goto release; 773 } 774 if (IN6_IS_ADDR_V4MAPPED(&inp->in6p_faddr)) { 775 if ((inp->inp_flags & IN6P_IPV6_V6ONLY)) { 776 /* 777 * XXX: this case would happen when the 778 * application sets the V6ONLY flag after 779 * connecting the foreign address. 780 * Such applications should be fixed, 781 * so we bark here. 782 */ 783 log(LOG_INFO, "udp6_output: IPV6_V6ONLY " 784 "option was set for a connected socket\n"); 785 error = EINVAL; 786 goto release; 787 } else 788 af = AF_INET; 789 } 790 laddr = &inp->in6p_laddr; 791 faddr = &inp->in6p_faddr; 792 fport = inp->inp_fport; 793 } 794 795 if (af == AF_INET) 796 hlen = sizeof(struct ip); 797 798 /* 799 * Calculate data length and get a mbuf 800 * for UDP and IP6 headers. 801 */ 802 M_PREPEND(m, hlen + sizeof(struct udphdr), M_NOWAIT); 803 if (m == NULL) { 804 error = ENOBUFS; 805 goto release; 806 } 807 808 /* 809 * Stuff checksum and output datagram. 810 */ 811 udp6 = (struct udphdr *)(mtod(m, caddr_t) + hlen); 812 udp6->uh_sport = inp->inp_lport; /* lport is always set in the PCB */ 813 udp6->uh_dport = fport; 814 if (nxt == IPPROTO_UDPLITE) { 815 struct udpcb *up; 816 817 up = intoudpcb(inp); 818 cscov = up->u_txcslen; 819 if (cscov >= plen) 820 cscov = 0; 821 udp6->uh_ulen = htons(cscov); 822 /* 823 * For UDP-Lite, checksum coverage length of zero means 824 * the entire UDPLite packet is covered by the checksum. 825 */ 826 cscov_partial = (cscov == 0) ? 0 : 1; 827 } else if (plen <= 0xffff) 828 udp6->uh_ulen = htons((u_short)plen); 829 else 830 udp6->uh_ulen = 0; 831 udp6->uh_sum = 0; 832 833 switch (af) { 834 case AF_INET6: 835 ip6 = mtod(m, struct ip6_hdr *); 836 ip6->ip6_flow = inp->inp_flow & IPV6_FLOWINFO_MASK; 837 ip6->ip6_vfc &= ~IPV6_VERSION_MASK; 838 ip6->ip6_vfc |= IPV6_VERSION; 839 ip6->ip6_plen = htons((u_short)plen); 840 ip6->ip6_nxt = nxt; 841 ip6->ip6_hlim = in6_selecthlim(inp, NULL); 842 ip6->ip6_src = *laddr; 843 ip6->ip6_dst = *faddr; 844 845 if (cscov_partial) { 846 if ((udp6->uh_sum = in6_cksum_partial(m, nxt, 847 sizeof(struct ip6_hdr), plen, cscov)) == 0) 848 udp6->uh_sum = 0xffff; 849 } else { 850 udp6->uh_sum = in6_cksum_pseudo(ip6, plen, nxt, 0); 851 m->m_pkthdr.csum_flags = CSUM_UDP_IPV6; 852 m->m_pkthdr.csum_data = offsetof(struct udphdr, uh_sum); 853 } 854 855 #ifdef RSS 856 { 857 uint32_t hash_val, hash_type; 858 uint8_t pr; 859 860 pr = inp->inp_socket->so_proto->pr_protocol; 861 /* 862 * Calculate an appropriate RSS hash for UDP and 863 * UDP Lite. 864 * 865 * The called function will take care of figuring out 866 * whether a 2-tuple or 4-tuple hash is required based 867 * on the currently configured scheme. 868 * 869 * Later later on connected socket values should be 870 * cached in the inpcb and reused, rather than constantly 871 * re-calculating it. 872 * 873 * UDP Lite is a different protocol number and will 874 * likely end up being hashed as a 2-tuple until 875 * RSS / NICs grow UDP Lite protocol awareness. 876 */ 877 if (rss_proto_software_hash_v6(faddr, laddr, fport, 878 inp->inp_lport, pr, &hash_val, &hash_type) == 0) { 879 m->m_pkthdr.flowid = hash_val; 880 M_HASHTYPE_SET(m, hash_type); 881 } 882 } 883 #endif 884 flags = 0; 885 #ifdef RSS 886 /* 887 * Don't override with the inp cached flowid. 888 * 889 * Until the whole UDP path is vetted, it may actually 890 * be incorrect. 891 */ 892 flags |= IP_NODEFAULTFLOWID; 893 #endif 894 895 UDP_PROBE(send, NULL, inp, ip6, inp, udp6); 896 UDPSTAT_INC(udps_opackets); 897 error = ip6_output(m, optp, &inp->inp_route6, flags, 898 inp->in6p_moptions, NULL, inp); 899 break; 900 case AF_INET: 901 error = EAFNOSUPPORT; 902 goto release; 903 } 904 goto releaseopt; 905 906 release: 907 m_freem(m); 908 909 releaseopt: 910 if (control) { 911 ip6_clearpktopts(&opt, -1); 912 m_freem(control); 913 } 914 return (error); 915 } 916 917 static void 918 udp6_abort(struct socket *so) 919 { 920 struct inpcb *inp; 921 struct inpcbinfo *pcbinfo; 922 923 pcbinfo = udp_get_inpcbinfo(so->so_proto->pr_protocol); 924 inp = sotoinpcb(so); 925 KASSERT(inp != NULL, ("udp6_abort: inp == NULL")); 926 927 INP_WLOCK(inp); 928 #ifdef INET 929 if (inp->inp_vflag & INP_IPV4) { 930 struct pr_usrreqs *pru; 931 uint8_t nxt; 932 933 nxt = (inp->inp_socket->so_proto->pr_protocol == IPPROTO_UDP) ? 934 IPPROTO_UDP : IPPROTO_UDPLITE; 935 INP_WUNLOCK(inp); 936 pru = inetsw[ip_protox[nxt]].pr_usrreqs; 937 (*pru->pru_abort)(so); 938 return; 939 } 940 #endif 941 942 if (!IN6_IS_ADDR_UNSPECIFIED(&inp->in6p_faddr)) { 943 INP_HASH_WLOCK(pcbinfo); 944 in6_pcbdisconnect(inp); 945 inp->in6p_laddr = in6addr_any; 946 INP_HASH_WUNLOCK(pcbinfo); 947 soisdisconnected(so); 948 } 949 INP_WUNLOCK(inp); 950 } 951 952 static int 953 udp6_attach(struct socket *so, int proto, struct thread *td) 954 { 955 struct inpcb *inp; 956 struct inpcbinfo *pcbinfo; 957 int error; 958 959 pcbinfo = udp_get_inpcbinfo(so->so_proto->pr_protocol); 960 inp = sotoinpcb(so); 961 KASSERT(inp == NULL, ("udp6_attach: inp != NULL")); 962 963 if (so->so_snd.sb_hiwat == 0 || so->so_rcv.sb_hiwat == 0) { 964 error = soreserve(so, udp_sendspace, udp_recvspace); 965 if (error) 966 return (error); 967 } 968 INP_INFO_WLOCK(pcbinfo); 969 error = in_pcballoc(so, pcbinfo); 970 if (error) { 971 INP_INFO_WUNLOCK(pcbinfo); 972 return (error); 973 } 974 inp = (struct inpcb *)so->so_pcb; 975 inp->inp_vflag |= INP_IPV6; 976 if ((inp->inp_flags & IN6P_IPV6_V6ONLY) == 0) 977 inp->inp_vflag |= INP_IPV4; 978 inp->in6p_hops = -1; /* use kernel default */ 979 inp->in6p_cksum = -1; /* just to be sure */ 980 /* 981 * XXX: ugly!! 982 * IPv4 TTL initialization is necessary for an IPv6 socket as well, 983 * because the socket may be bound to an IPv6 wildcard address, 984 * which may match an IPv4-mapped IPv6 address. 985 */ 986 inp->inp_ip_ttl = V_ip_defttl; 987 988 error = udp_newudpcb(inp); 989 if (error) { 990 in_pcbdetach(inp); 991 in_pcbfree(inp); 992 INP_INFO_WUNLOCK(pcbinfo); 993 return (error); 994 } 995 INP_WUNLOCK(inp); 996 INP_INFO_WUNLOCK(pcbinfo); 997 return (0); 998 } 999 1000 static int 1001 udp6_bind(struct socket *so, struct sockaddr *nam, struct thread *td) 1002 { 1003 struct inpcb *inp; 1004 struct inpcbinfo *pcbinfo; 1005 int error; 1006 u_char vflagsav; 1007 1008 pcbinfo = udp_get_inpcbinfo(so->so_proto->pr_protocol); 1009 inp = sotoinpcb(so); 1010 KASSERT(inp != NULL, ("udp6_bind: inp == NULL")); 1011 1012 INP_WLOCK(inp); 1013 INP_HASH_WLOCK(pcbinfo); 1014 vflagsav = inp->inp_vflag; 1015 inp->inp_vflag &= ~INP_IPV4; 1016 inp->inp_vflag |= INP_IPV6; 1017 if ((inp->inp_flags & IN6P_IPV6_V6ONLY) == 0) { 1018 struct sockaddr_in6 *sin6_p; 1019 1020 sin6_p = (struct sockaddr_in6 *)nam; 1021 1022 if (IN6_IS_ADDR_UNSPECIFIED(&sin6_p->sin6_addr)) 1023 inp->inp_vflag |= INP_IPV4; 1024 #ifdef INET 1025 else if (IN6_IS_ADDR_V4MAPPED(&sin6_p->sin6_addr)) { 1026 struct sockaddr_in sin; 1027 1028 in6_sin6_2_sin(&sin, sin6_p); 1029 inp->inp_vflag |= INP_IPV4; 1030 inp->inp_vflag &= ~INP_IPV6; 1031 error = in_pcbbind(inp, (struct sockaddr *)&sin, 1032 td->td_ucred); 1033 goto out; 1034 } 1035 #endif 1036 } 1037 1038 error = in6_pcbbind(inp, nam, td->td_ucred); 1039 #ifdef INET 1040 out: 1041 #endif 1042 if (error != 0) 1043 inp->inp_vflag = vflagsav; 1044 INP_HASH_WUNLOCK(pcbinfo); 1045 INP_WUNLOCK(inp); 1046 return (error); 1047 } 1048 1049 static void 1050 udp6_close(struct socket *so) 1051 { 1052 struct inpcb *inp; 1053 struct inpcbinfo *pcbinfo; 1054 1055 pcbinfo = udp_get_inpcbinfo(so->so_proto->pr_protocol); 1056 inp = sotoinpcb(so); 1057 KASSERT(inp != NULL, ("udp6_close: inp == NULL")); 1058 1059 INP_WLOCK(inp); 1060 #ifdef INET 1061 if (inp->inp_vflag & INP_IPV4) { 1062 struct pr_usrreqs *pru; 1063 uint8_t nxt; 1064 1065 nxt = (inp->inp_socket->so_proto->pr_protocol == IPPROTO_UDP) ? 1066 IPPROTO_UDP : IPPROTO_UDPLITE; 1067 INP_WUNLOCK(inp); 1068 pru = inetsw[ip_protox[nxt]].pr_usrreqs; 1069 (*pru->pru_disconnect)(so); 1070 return; 1071 } 1072 #endif 1073 if (!IN6_IS_ADDR_UNSPECIFIED(&inp->in6p_faddr)) { 1074 INP_HASH_WLOCK(pcbinfo); 1075 in6_pcbdisconnect(inp); 1076 inp->in6p_laddr = in6addr_any; 1077 INP_HASH_WUNLOCK(pcbinfo); 1078 soisdisconnected(so); 1079 } 1080 INP_WUNLOCK(inp); 1081 } 1082 1083 static int 1084 udp6_connect(struct socket *so, struct sockaddr *nam, struct thread *td) 1085 { 1086 struct inpcb *inp; 1087 struct inpcbinfo *pcbinfo; 1088 struct sockaddr_in6 *sin6; 1089 int error; 1090 u_char vflagsav; 1091 1092 pcbinfo = udp_get_inpcbinfo(so->so_proto->pr_protocol); 1093 inp = sotoinpcb(so); 1094 sin6 = (struct sockaddr_in6 *)nam; 1095 KASSERT(inp != NULL, ("udp6_connect: inp == NULL")); 1096 1097 /* 1098 * XXXRW: Need to clarify locking of v4/v6 flags. 1099 */ 1100 INP_WLOCK(inp); 1101 #ifdef INET 1102 if (IN6_IS_ADDR_V4MAPPED(&sin6->sin6_addr)) { 1103 struct sockaddr_in sin; 1104 1105 if ((inp->inp_flags & IN6P_IPV6_V6ONLY) != 0) { 1106 error = EINVAL; 1107 goto out; 1108 } 1109 if ((inp->inp_vflag & INP_IPV4) == 0) { 1110 error = EAFNOSUPPORT; 1111 goto out; 1112 } 1113 if (inp->inp_faddr.s_addr != INADDR_ANY) { 1114 error = EISCONN; 1115 goto out; 1116 } 1117 in6_sin6_2_sin(&sin, sin6); 1118 error = prison_remote_ip4(td->td_ucred, &sin.sin_addr); 1119 if (error != 0) 1120 goto out; 1121 vflagsav = inp->inp_vflag; 1122 inp->inp_vflag |= INP_IPV4; 1123 inp->inp_vflag &= ~INP_IPV6; 1124 INP_HASH_WLOCK(pcbinfo); 1125 error = in_pcbconnect(inp, (struct sockaddr *)&sin, 1126 td->td_ucred); 1127 INP_HASH_WUNLOCK(pcbinfo); 1128 /* 1129 * If connect succeeds, mark socket as connected. If 1130 * connect fails and socket is unbound, reset inp_vflag 1131 * field. 1132 */ 1133 if (error == 0) 1134 soisconnected(so); 1135 else if (inp->inp_laddr.s_addr == INADDR_ANY && 1136 inp->inp_lport == 0) 1137 inp->inp_vflag = vflagsav; 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 error = prison_remote_ip6(td->td_ucred, &sin6->sin6_addr); 1151 if (error != 0) 1152 goto out; 1153 vflagsav = inp->inp_vflag; 1154 inp->inp_vflag &= ~INP_IPV4; 1155 inp->inp_vflag |= INP_IPV6; 1156 INP_HASH_WLOCK(pcbinfo); 1157 error = in6_pcbconnect(inp, nam, td->td_ucred); 1158 INP_HASH_WUNLOCK(pcbinfo); 1159 /* 1160 * If connect succeeds, mark socket as connected. If 1161 * connect fails and socket is unbound, reset inp_vflag 1162 * field. 1163 */ 1164 if (error == 0) 1165 soisconnected(so); 1166 else if (IN6_IS_ADDR_UNSPECIFIED(&inp->in6p_laddr) && 1167 inp->inp_lport == 0) 1168 inp->inp_vflag = vflagsav; 1169 out: 1170 INP_WUNLOCK(inp); 1171 return (error); 1172 } 1173 1174 static void 1175 udp6_detach(struct socket *so) 1176 { 1177 struct inpcb *inp; 1178 struct inpcbinfo *pcbinfo; 1179 struct udpcb *up; 1180 1181 pcbinfo = udp_get_inpcbinfo(so->so_proto->pr_protocol); 1182 inp = sotoinpcb(so); 1183 KASSERT(inp != NULL, ("udp6_detach: inp == NULL")); 1184 1185 INP_INFO_WLOCK(pcbinfo); 1186 INP_WLOCK(inp); 1187 up = intoudpcb(inp); 1188 KASSERT(up != NULL, ("%s: up == NULL", __func__)); 1189 in_pcbdetach(inp); 1190 in_pcbfree(inp); 1191 INP_INFO_WUNLOCK(pcbinfo); 1192 udp_discardcb(up); 1193 } 1194 1195 static int 1196 udp6_disconnect(struct socket *so) 1197 { 1198 struct inpcb *inp; 1199 struct inpcbinfo *pcbinfo; 1200 int error; 1201 1202 pcbinfo = udp_get_inpcbinfo(so->so_proto->pr_protocol); 1203 inp = sotoinpcb(so); 1204 KASSERT(inp != NULL, ("udp6_disconnect: inp == NULL")); 1205 1206 INP_WLOCK(inp); 1207 #ifdef INET 1208 if (inp->inp_vflag & INP_IPV4) { 1209 struct pr_usrreqs *pru; 1210 uint8_t nxt; 1211 1212 nxt = (inp->inp_socket->so_proto->pr_protocol == IPPROTO_UDP) ? 1213 IPPROTO_UDP : IPPROTO_UDPLITE; 1214 INP_WUNLOCK(inp); 1215 pru = inetsw[ip_protox[nxt]].pr_usrreqs; 1216 (void)(*pru->pru_disconnect)(so); 1217 return (0); 1218 } 1219 #endif 1220 1221 if (IN6_IS_ADDR_UNSPECIFIED(&inp->in6p_faddr)) { 1222 error = ENOTCONN; 1223 goto out; 1224 } 1225 1226 INP_HASH_WLOCK(pcbinfo); 1227 in6_pcbdisconnect(inp); 1228 inp->in6p_laddr = in6addr_any; 1229 INP_HASH_WUNLOCK(pcbinfo); 1230 SOCK_LOCK(so); 1231 so->so_state &= ~SS_ISCONNECTED; /* XXX */ 1232 SOCK_UNLOCK(so); 1233 out: 1234 INP_WUNLOCK(inp); 1235 return (0); 1236 } 1237 1238 static int 1239 udp6_send(struct socket *so, int flags, struct mbuf *m, 1240 struct sockaddr *addr, struct mbuf *control, struct thread *td) 1241 { 1242 struct inpcb *inp; 1243 struct inpcbinfo *pcbinfo; 1244 int error = 0; 1245 1246 pcbinfo = udp_get_inpcbinfo(so->so_proto->pr_protocol); 1247 inp = sotoinpcb(so); 1248 KASSERT(inp != NULL, ("udp6_send: inp == NULL")); 1249 1250 INP_WLOCK(inp); 1251 if (addr) { 1252 if (addr->sa_len != sizeof(struct sockaddr_in6)) { 1253 error = EINVAL; 1254 goto bad; 1255 } 1256 if (addr->sa_family != AF_INET6) { 1257 error = EAFNOSUPPORT; 1258 goto bad; 1259 } 1260 } 1261 1262 #ifdef INET 1263 if ((inp->inp_flags & IN6P_IPV6_V6ONLY) == 0) { 1264 int hasv4addr; 1265 struct sockaddr_in6 *sin6 = NULL; 1266 1267 if (addr == NULL) 1268 hasv4addr = (inp->inp_vflag & INP_IPV4); 1269 else { 1270 sin6 = (struct sockaddr_in6 *)addr; 1271 hasv4addr = IN6_IS_ADDR_V4MAPPED(&sin6->sin6_addr) 1272 ? 1 : 0; 1273 } 1274 if (hasv4addr) { 1275 struct pr_usrreqs *pru; 1276 uint8_t nxt; 1277 1278 nxt = (inp->inp_socket->so_proto->pr_protocol == 1279 IPPROTO_UDP) ? IPPROTO_UDP : IPPROTO_UDPLITE; 1280 /* 1281 * XXXRW: We release UDP-layer locks before calling 1282 * udp_send() in order to avoid recursion. However, 1283 * this does mean there is a short window where inp's 1284 * fields are unstable. Could this lead to a 1285 * potential race in which the factors causing us to 1286 * select the UDPv4 output routine are invalidated? 1287 */ 1288 INP_WUNLOCK(inp); 1289 if (sin6) 1290 in6_sin6_2_sin_in_sock(addr); 1291 pru = inetsw[ip_protox[nxt]].pr_usrreqs; 1292 /* addr will just be freed in sendit(). */ 1293 return ((*pru->pru_send)(so, flags, m, addr, control, 1294 td)); 1295 } 1296 } 1297 #endif 1298 #ifdef MAC 1299 mac_inpcb_create_mbuf(inp, m); 1300 #endif 1301 INP_HASH_WLOCK(pcbinfo); 1302 error = udp6_output(inp, m, addr, control, td); 1303 INP_HASH_WUNLOCK(pcbinfo); 1304 INP_WUNLOCK(inp); 1305 return (error); 1306 1307 bad: 1308 INP_WUNLOCK(inp); 1309 m_freem(m); 1310 return (error); 1311 } 1312 1313 struct pr_usrreqs udp6_usrreqs = { 1314 .pru_abort = udp6_abort, 1315 .pru_attach = udp6_attach, 1316 .pru_bind = udp6_bind, 1317 .pru_connect = udp6_connect, 1318 .pru_control = in6_control, 1319 .pru_detach = udp6_detach, 1320 .pru_disconnect = udp6_disconnect, 1321 .pru_peeraddr = in6_mapped_peeraddr, 1322 .pru_send = udp6_send, 1323 .pru_shutdown = udp_shutdown, 1324 .pru_sockaddr = in6_mapped_sockaddr, 1325 .pru_soreceive = soreceive_dgram, 1326 .pru_sosend = sosend_dgram, 1327 .pru_sosetlabel = in_pcbsosetlabel, 1328 .pru_close = udp6_close 1329 };
Cache object: d9fada02e367567d4ff30427254b6932
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