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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 * All rights reserved. 5 * 6 * Portions of this software were developed by Robert N. M. Watson under 7 * contract to Juniper Networks, Inc. 8 * 9 * Redistribution and use in source and binary forms, with or without 10 * modification, are permitted provided that the following conditions 11 * are met: 12 * 1. Redistributions of source code must retain the above copyright 13 * notice, this list of conditions and the following disclaimer. 14 * 2. Redistributions in binary form must reproduce the above copyright 15 * notice, this list of conditions and the following disclaimer in the 16 * documentation and/or other materials provided with the distribution. 17 * 3. Neither the name of the project nor the names of its contributors 18 * may be used to endorse or promote products derived from this software 19 * without specific prior written permission. 20 * 21 * THIS SOFTWARE IS PROVIDED BY THE PROJECT AND CONTRIBUTORS ``AS IS'' AND 22 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 23 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 24 * ARE DISCLAIMED. IN NO EVENT SHALL THE PROJECT OR CONTRIBUTORS BE LIABLE 25 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 26 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 27 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 28 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 29 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 30 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 31 * SUCH DAMAGE. 32 * 33 * $KAME: udp6_usrreq.c,v 1.27 2001/05/21 05:45:10 jinmei Exp $ 34 * $KAME: udp6_output.c,v 1.31 2001/05/21 16:39:15 jinmei Exp $ 35 */ 36 37 /*- 38 * Copyright (c) 1982, 1986, 1988, 1990, 1993, 1995 39 * The Regents of the University of California. 40 * All rights reserved. 41 * 42 * Redistribution and use in source and binary forms, with or without 43 * modification, are permitted provided that the following conditions 44 * are met: 45 * 1. Redistributions of source code must retain the above copyright 46 * notice, this list of conditions and the following disclaimer. 47 * 2. Redistributions in binary form must reproduce the above copyright 48 * notice, this list of conditions and the following disclaimer in the 49 * documentation and/or other materials provided with the distribution. 50 * 4. Neither the name of the University nor the names of its contributors 51 * may be used to endorse or promote products derived from this software 52 * without specific prior written permission. 53 * 54 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND 55 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 56 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 57 * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE 58 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 59 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 60 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 61 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 62 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 63 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 64 * SUCH DAMAGE. 65 * 66 * @(#)udp_usrreq.c 8.6 (Berkeley) 5/23/95 67 */ 68 69 #include <sys/cdefs.h> 70 __FBSDID("$FreeBSD: releng/9.1/sys/netinet6/udp6_usrreq.c 238247 2012-07-08 14:21:36Z bz $"); 71 72 #include "opt_inet.h" 73 #include "opt_inet6.h" 74 #include "opt_ipfw.h" 75 #include "opt_ipsec.h" 76 77 #include <sys/param.h> 78 #include <sys/jail.h> 79 #include <sys/kernel.h> 80 #include <sys/lock.h> 81 #include <sys/mbuf.h> 82 #include <sys/priv.h> 83 #include <sys/proc.h> 84 #include <sys/protosw.h> 85 #include <sys/signalvar.h> 86 #include <sys/socket.h> 87 #include <sys/socketvar.h> 88 #include <sys/sx.h> 89 #include <sys/sysctl.h> 90 #include <sys/syslog.h> 91 #include <sys/systm.h> 92 93 #include <net/if.h> 94 #include <net/if_types.h> 95 #include <net/route.h> 96 97 #include <netinet/in.h> 98 #include <netinet/in_pcb.h> 99 #include <netinet/in_systm.h> 100 #include <netinet/in_var.h> 101 #include <netinet/ip.h> 102 #include <netinet/ip_icmp.h> 103 #include <netinet/ip6.h> 104 #include <netinet/icmp_var.h> 105 #include <netinet/icmp6.h> 106 #include <netinet/ip_var.h> 107 #include <netinet/udp.h> 108 #include <netinet/udp_var.h> 109 110 #include <netinet6/ip6protosw.h> 111 #include <netinet6/ip6_var.h> 112 #include <netinet6/in6_pcb.h> 113 #include <netinet6/udp6_var.h> 114 #include <netinet6/scope6_var.h> 115 116 #ifdef IPSEC 117 #include <netipsec/ipsec.h> 118 #include <netipsec/ipsec6.h> 119 #endif /* IPSEC */ 120 121 #include <security/mac/mac_framework.h> 122 123 /* 124 * UDP protocol implementation. 125 * Per RFC 768, August, 1980. 126 */ 127 128 extern struct protosw inetsw[]; 129 static void udp6_detach(struct socket *so); 130 131 static void 132 udp6_append(struct inpcb *inp, struct mbuf *n, int off, 133 struct sockaddr_in6 *fromsa) 134 { 135 struct socket *so; 136 struct mbuf *opts; 137 138 INP_LOCK_ASSERT(inp); 139 140 #ifdef IPSEC 141 /* Check AH/ESP integrity. */ 142 if (ipsec6_in_reject(n, inp)) { 143 m_freem(n); 144 V_ipsec6stat.in_polvio++; 145 return; 146 } 147 #endif /* IPSEC */ 148 #ifdef MAC 149 if (mac_inpcb_check_deliver(inp, n) != 0) { 150 m_freem(n); 151 return; 152 } 153 #endif 154 opts = NULL; 155 if (inp->inp_flags & INP_CONTROLOPTS || 156 inp->inp_socket->so_options & SO_TIMESTAMP) 157 ip6_savecontrol(inp, n, &opts); 158 m_adj(n, off + sizeof(struct udphdr)); 159 160 so = inp->inp_socket; 161 SOCKBUF_LOCK(&so->so_rcv); 162 if (sbappendaddr_locked(&so->so_rcv, (struct sockaddr *)fromsa, n, 163 opts) == 0) { 164 SOCKBUF_UNLOCK(&so->so_rcv); 165 m_freem(n); 166 if (opts) 167 m_freem(opts); 168 UDPSTAT_INC(udps_fullsock); 169 } else 170 sorwakeup_locked(so); 171 } 172 173 int 174 udp6_input(struct mbuf **mp, int *offp, int proto) 175 { 176 struct mbuf *m = *mp; 177 struct ifnet *ifp; 178 struct ip6_hdr *ip6; 179 struct udphdr *uh; 180 struct inpcb *inp; 181 struct udpcb *up; 182 int off = *offp; 183 int plen, ulen; 184 struct sockaddr_in6 fromsa; 185 #ifdef IPFIREWALL_FORWARD 186 struct m_tag *fwd_tag; 187 #endif 188 uint16_t uh_sum; 189 190 ifp = m->m_pkthdr.rcvif; 191 ip6 = mtod(m, struct ip6_hdr *); 192 193 if (faithprefix_p != NULL && (*faithprefix_p)(&ip6->ip6_dst)) { 194 /* XXX send icmp6 host/port unreach? */ 195 m_freem(m); 196 return (IPPROTO_DONE); 197 } 198 199 #ifndef PULLDOWN_TEST 200 IP6_EXTHDR_CHECK(m, off, sizeof(struct udphdr), IPPROTO_DONE); 201 ip6 = mtod(m, struct ip6_hdr *); 202 uh = (struct udphdr *)((caddr_t)ip6 + off); 203 #else 204 IP6_EXTHDR_GET(uh, struct udphdr *, m, off, sizeof(*uh)); 205 if (!uh) 206 return (IPPROTO_DONE); 207 #endif 208 209 UDPSTAT_INC(udps_ipackets); 210 211 /* 212 * Destination port of 0 is illegal, based on RFC768. 213 */ 214 if (uh->uh_dport == 0) 215 goto badunlocked; 216 217 plen = ntohs(ip6->ip6_plen) - off + sizeof(*ip6); 218 ulen = ntohs((u_short)uh->uh_ulen); 219 220 if (plen != ulen) { 221 UDPSTAT_INC(udps_badlen); 222 goto badunlocked; 223 } 224 225 /* 226 * Checksum extended UDP header and data. 227 */ 228 if (uh->uh_sum == 0) { 229 UDPSTAT_INC(udps_nosum); 230 goto badunlocked; 231 } 232 233 if (m->m_pkthdr.csum_flags & CSUM_DATA_VALID_IPV6) { 234 if (m->m_pkthdr.csum_flags & CSUM_PSEUDO_HDR) 235 uh_sum = m->m_pkthdr.csum_data; 236 else 237 uh_sum = in6_cksum_pseudo(ip6, ulen, 238 IPPROTO_UDP, m->m_pkthdr.csum_data); 239 uh_sum ^= 0xffff; 240 } else 241 uh_sum = in6_cksum(m, IPPROTO_UDP, off, ulen); 242 243 if (uh_sum != 0) { 244 UDPSTAT_INC(udps_badsum); 245 goto badunlocked; 246 } 247 248 /* 249 * Construct sockaddr format source address. 250 */ 251 init_sin6(&fromsa, m); 252 fromsa.sin6_port = uh->uh_sport; 253 254 if (IN6_IS_ADDR_MULTICAST(&ip6->ip6_dst)) { 255 struct inpcb *last; 256 struct ip6_moptions *imo; 257 258 INP_INFO_RLOCK(&V_udbinfo); 259 /* 260 * In the event that laddr should be set to the link-local 261 * address (this happens in RIPng), the multicast address 262 * specified in the received packet will not match laddr. To 263 * handle this situation, matching is relaxed if the 264 * receiving interface is the same as one specified in the 265 * socket and if the destination multicast address matches 266 * one of the multicast groups specified in the socket. 267 */ 268 269 /* 270 * KAME note: traditionally we dropped udpiphdr from mbuf 271 * here. We need udphdr for IPsec processing so we do that 272 * later. 273 */ 274 last = NULL; 275 LIST_FOREACH(inp, &V_udb, inp_list) { 276 if ((inp->inp_vflag & INP_IPV6) == 0) 277 continue; 278 if (inp->inp_lport != uh->uh_dport) 279 continue; 280 if (inp->inp_fport != 0 && 281 inp->inp_fport != uh->uh_sport) 282 continue; 283 if (!IN6_IS_ADDR_UNSPECIFIED(&inp->in6p_laddr)) { 284 if (!IN6_ARE_ADDR_EQUAL(&inp->in6p_laddr, 285 &ip6->ip6_dst)) 286 continue; 287 } 288 if (!IN6_IS_ADDR_UNSPECIFIED(&inp->in6p_faddr)) { 289 if (!IN6_ARE_ADDR_EQUAL(&inp->in6p_faddr, 290 &ip6->ip6_src) || 291 inp->inp_fport != uh->uh_sport) 292 continue; 293 } 294 295 /* 296 * XXXRW: Because we weren't holding either the inpcb 297 * or the hash lock when we checked for a match 298 * before, we should probably recheck now that the 299 * inpcb lock is (supposed to be) held. 300 */ 301 302 /* 303 * Handle socket delivery policy for any-source 304 * and source-specific multicast. [RFC3678] 305 */ 306 imo = inp->in6p_moptions; 307 if (imo && IN6_IS_ADDR_MULTICAST(&ip6->ip6_dst)) { 308 struct sockaddr_in6 mcaddr; 309 int blocked; 310 311 INP_RLOCK(inp); 312 313 bzero(&mcaddr, sizeof(struct sockaddr_in6)); 314 mcaddr.sin6_len = sizeof(struct sockaddr_in6); 315 mcaddr.sin6_family = AF_INET6; 316 mcaddr.sin6_addr = ip6->ip6_dst; 317 318 blocked = im6o_mc_filter(imo, ifp, 319 (struct sockaddr *)&mcaddr, 320 (struct sockaddr *)&fromsa); 321 if (blocked != MCAST_PASS) { 322 if (blocked == MCAST_NOTGMEMBER) 323 IP6STAT_INC(ip6s_notmember); 324 if (blocked == MCAST_NOTSMEMBER || 325 blocked == MCAST_MUTED) 326 UDPSTAT_INC(udps_filtermcast); 327 INP_RUNLOCK(inp); /* XXX */ 328 continue; 329 } 330 331 INP_RUNLOCK(inp); 332 } 333 if (last != NULL) { 334 struct mbuf *n; 335 336 if ((n = m_copy(m, 0, M_COPYALL)) != NULL) { 337 INP_RLOCK(last); 338 up = intoudpcb(last); 339 if (up->u_tun_func == NULL) { 340 udp6_append(last, n, off, &fromsa); 341 } else { 342 /* 343 * Engage the tunneling 344 * protocol we will have to 345 * leave the info_lock up, 346 * since we are hunting 347 * through multiple UDP's. 348 * 349 */ 350 (*up->u_tun_func)(n, off, last); 351 } 352 INP_RUNLOCK(last); 353 } 354 } 355 last = inp; 356 /* 357 * Don't look for additional matches if this one does 358 * not have either the SO_REUSEPORT or SO_REUSEADDR 359 * socket options set. This heuristic avoids 360 * searching through all pcbs in the common case of a 361 * non-shared port. It assumes that an application 362 * will never clear these options after setting them. 363 */ 364 if ((last->inp_socket->so_options & 365 (SO_REUSEPORT|SO_REUSEADDR)) == 0) 366 break; 367 } 368 369 if (last == NULL) { 370 /* 371 * No matching pcb found; discard datagram. (No need 372 * to send an ICMP Port Unreachable for a broadcast 373 * or multicast datgram.) 374 */ 375 UDPSTAT_INC(udps_noport); 376 UDPSTAT_INC(udps_noportmcast); 377 goto badheadlocked; 378 } 379 INP_RLOCK(last); 380 INP_INFO_RUNLOCK(&V_udbinfo); 381 up = intoudpcb(last); 382 if (up->u_tun_func == NULL) { 383 udp6_append(last, m, off, &fromsa); 384 } else { 385 /* 386 * Engage the tunneling protocol. 387 */ 388 (*up->u_tun_func)(m, off, last); 389 } 390 INP_RUNLOCK(last); 391 return (IPPROTO_DONE); 392 } 393 /* 394 * Locate pcb for datagram. 395 */ 396 #ifdef IPFIREWALL_FORWARD 397 /* 398 * Grab info from PACKET_TAG_IPFORWARD tag prepended to the chain. 399 */ 400 fwd_tag = m_tag_find(m, PACKET_TAG_IPFORWARD, NULL); 401 if (fwd_tag != NULL) { 402 struct sockaddr_in6 *next_hop6; 403 404 next_hop6 = (struct sockaddr_in6 *)(fwd_tag + 1); 405 406 /* 407 * Transparently forwarded. Pretend to be the destination. 408 * Already got one like this? 409 */ 410 inp = in6_pcblookup_mbuf(&V_udbinfo, 411 &ip6->ip6_src, uh->uh_sport, &ip6->ip6_dst, uh->uh_dport, 412 INPLOOKUP_RLOCKPCB, m->m_pkthdr.rcvif, m); 413 if (!inp) { 414 /* 415 * It's new. Try to find the ambushing socket. 416 * Because we've rewritten the destination address, 417 * any hardware-generated hash is ignored. 418 */ 419 inp = in6_pcblookup(&V_udbinfo, &ip6->ip6_src, 420 uh->uh_sport, &next_hop6->sin6_addr, 421 next_hop6->sin6_port ? htons(next_hop6->sin6_port) : 422 uh->uh_dport, INPLOOKUP_WILDCARD | 423 INPLOOKUP_RLOCKPCB, m->m_pkthdr.rcvif); 424 } 425 /* Remove the tag from the packet. We don't need it anymore. */ 426 m_tag_delete(m, fwd_tag); 427 } else 428 #endif /* IPFIREWALL_FORWARD */ 429 inp = in6_pcblookup_mbuf(&V_udbinfo, &ip6->ip6_src, 430 uh->uh_sport, &ip6->ip6_dst, uh->uh_dport, 431 INPLOOKUP_WILDCARD | INPLOOKUP_RLOCKPCB, 432 m->m_pkthdr.rcvif, m); 433 if (inp == NULL) { 434 if (udp_log_in_vain) { 435 char ip6bufs[INET6_ADDRSTRLEN]; 436 char ip6bufd[INET6_ADDRSTRLEN]; 437 438 log(LOG_INFO, 439 "Connection attempt to UDP [%s]:%d from [%s]:%d\n", 440 ip6_sprintf(ip6bufd, &ip6->ip6_dst), 441 ntohs(uh->uh_dport), 442 ip6_sprintf(ip6bufs, &ip6->ip6_src), 443 ntohs(uh->uh_sport)); 444 } 445 UDPSTAT_INC(udps_noport); 446 if (m->m_flags & M_MCAST) { 447 printf("UDP6: M_MCAST is set in a unicast packet.\n"); 448 UDPSTAT_INC(udps_noportmcast); 449 goto badunlocked; 450 } 451 if (V_udp_blackhole) 452 goto badunlocked; 453 if (badport_bandlim(BANDLIM_ICMP6_UNREACH) < 0) 454 goto badunlocked; 455 icmp6_error(m, ICMP6_DST_UNREACH, ICMP6_DST_UNREACH_NOPORT, 0); 456 return (IPPROTO_DONE); 457 } 458 INP_RLOCK_ASSERT(inp); 459 up = intoudpcb(inp); 460 if (up->u_tun_func == NULL) { 461 udp6_append(inp, m, off, &fromsa); 462 } else { 463 /* 464 * Engage the tunneling protocol. 465 */ 466 467 (*up->u_tun_func)(m, off, inp); 468 } 469 INP_RUNLOCK(inp); 470 return (IPPROTO_DONE); 471 472 badheadlocked: 473 INP_INFO_RUNLOCK(&V_udbinfo); 474 badunlocked: 475 if (m) 476 m_freem(m); 477 return (IPPROTO_DONE); 478 } 479 480 void 481 udp6_ctlinput(int cmd, struct sockaddr *sa, void *d) 482 { 483 struct udphdr uh; 484 struct ip6_hdr *ip6; 485 struct mbuf *m; 486 int off = 0; 487 struct ip6ctlparam *ip6cp = NULL; 488 const struct sockaddr_in6 *sa6_src = NULL; 489 void *cmdarg; 490 struct inpcb *(*notify)(struct inpcb *, int) = udp_notify; 491 struct udp_portonly { 492 u_int16_t uh_sport; 493 u_int16_t uh_dport; 494 } *uhp; 495 496 if (sa->sa_family != AF_INET6 || 497 sa->sa_len != sizeof(struct sockaddr_in6)) 498 return; 499 500 if ((unsigned)cmd >= PRC_NCMDS) 501 return; 502 if (PRC_IS_REDIRECT(cmd)) 503 notify = in6_rtchange, d = NULL; 504 else if (cmd == PRC_HOSTDEAD) 505 d = NULL; 506 else if (inet6ctlerrmap[cmd] == 0) 507 return; 508 509 /* if the parameter is from icmp6, decode it. */ 510 if (d != NULL) { 511 ip6cp = (struct ip6ctlparam *)d; 512 m = ip6cp->ip6c_m; 513 ip6 = ip6cp->ip6c_ip6; 514 off = ip6cp->ip6c_off; 515 cmdarg = ip6cp->ip6c_cmdarg; 516 sa6_src = ip6cp->ip6c_src; 517 } else { 518 m = NULL; 519 ip6 = NULL; 520 cmdarg = NULL; 521 sa6_src = &sa6_any; 522 } 523 524 if (ip6) { 525 /* 526 * XXX: We assume that when IPV6 is non NULL, 527 * M and OFF are valid. 528 */ 529 530 /* Check if we can safely examine src and dst ports. */ 531 if (m->m_pkthdr.len < off + sizeof(*uhp)) 532 return; 533 534 bzero(&uh, sizeof(uh)); 535 m_copydata(m, off, sizeof(*uhp), (caddr_t)&uh); 536 537 (void) in6_pcbnotify(&V_udbinfo, sa, uh.uh_dport, 538 (struct sockaddr *)ip6cp->ip6c_src, uh.uh_sport, cmd, 539 cmdarg, notify); 540 } else 541 (void) in6_pcbnotify(&V_udbinfo, sa, 0, 542 (const struct sockaddr *)sa6_src, 0, cmd, cmdarg, notify); 543 } 544 545 static int 546 udp6_getcred(SYSCTL_HANDLER_ARGS) 547 { 548 struct xucred xuc; 549 struct sockaddr_in6 addrs[2]; 550 struct inpcb *inp; 551 int error; 552 553 error = priv_check(req->td, PRIV_NETINET_GETCRED); 554 if (error) 555 return (error); 556 557 if (req->newlen != sizeof(addrs)) 558 return (EINVAL); 559 if (req->oldlen != sizeof(struct xucred)) 560 return (EINVAL); 561 error = SYSCTL_IN(req, addrs, sizeof(addrs)); 562 if (error) 563 return (error); 564 if ((error = sa6_embedscope(&addrs[0], V_ip6_use_defzone)) != 0 || 565 (error = sa6_embedscope(&addrs[1], V_ip6_use_defzone)) != 0) { 566 return (error); 567 } 568 inp = in6_pcblookup(&V_udbinfo, &addrs[1].sin6_addr, 569 addrs[1].sin6_port, &addrs[0].sin6_addr, addrs[0].sin6_port, 570 INPLOOKUP_WILDCARD | INPLOOKUP_RLOCKPCB, NULL); 571 if (inp != NULL) { 572 INP_RLOCK_ASSERT(inp); 573 if (inp->inp_socket == NULL) 574 error = ENOENT; 575 if (error == 0) 576 error = cr_canseesocket(req->td->td_ucred, 577 inp->inp_socket); 578 if (error == 0) 579 cru2x(inp->inp_cred, &xuc); 580 INP_RUNLOCK(inp); 581 } else 582 error = ENOENT; 583 if (error == 0) 584 error = SYSCTL_OUT(req, &xuc, sizeof(struct xucred)); 585 return (error); 586 } 587 588 SYSCTL_PROC(_net_inet6_udp6, OID_AUTO, getcred, CTLTYPE_OPAQUE|CTLFLAG_RW, 0, 589 0, udp6_getcred, "S,xucred", "Get the xucred of a UDP6 connection"); 590 591 static int 592 udp6_output(struct inpcb *inp, struct mbuf *m, struct sockaddr *addr6, 593 struct mbuf *control, struct thread *td) 594 { 595 u_int32_t ulen = m->m_pkthdr.len; 596 u_int32_t plen = sizeof(struct udphdr) + ulen; 597 struct ip6_hdr *ip6; 598 struct udphdr *udp6; 599 struct in6_addr *laddr, *faddr, in6a; 600 struct sockaddr_in6 *sin6 = NULL; 601 struct ifnet *oifp = NULL; 602 int scope_ambiguous = 0; 603 u_short fport; 604 int error = 0; 605 struct ip6_pktopts *optp, opt; 606 int af = AF_INET6, hlen = sizeof(struct ip6_hdr); 607 int flags; 608 struct sockaddr_in6 tmp; 609 610 INP_WLOCK_ASSERT(inp); 611 INP_HASH_WLOCK_ASSERT(inp->inp_pcbinfo); 612 613 if (addr6) { 614 /* addr6 has been validated in udp6_send(). */ 615 sin6 = (struct sockaddr_in6 *)addr6; 616 617 /* protect *sin6 from overwrites */ 618 tmp = *sin6; 619 sin6 = &tmp; 620 621 /* 622 * Application should provide a proper zone ID or the use of 623 * default zone IDs should be enabled. Unfortunately, some 624 * applications do not behave as it should, so we need a 625 * workaround. Even if an appropriate ID is not determined, 626 * we'll see if we can determine the outgoing interface. If we 627 * can, determine the zone ID based on the interface below. 628 */ 629 if (sin6->sin6_scope_id == 0 && !V_ip6_use_defzone) 630 scope_ambiguous = 1; 631 if ((error = sa6_embedscope(sin6, V_ip6_use_defzone)) != 0) 632 return (error); 633 } 634 635 if (control) { 636 if ((error = ip6_setpktopts(control, &opt, 637 inp->in6p_outputopts, td->td_ucred, IPPROTO_UDP)) != 0) 638 goto release; 639 optp = &opt; 640 } else 641 optp = inp->in6p_outputopts; 642 643 if (sin6) { 644 faddr = &sin6->sin6_addr; 645 646 /* 647 * IPv4 version of udp_output calls in_pcbconnect in this case, 648 * which needs splnet and affects performance. 649 * Since we saw no essential reason for calling in_pcbconnect, 650 * we get rid of such kind of logic, and call in6_selectsrc 651 * and in6_pcbsetport in order to fill in the local address 652 * and the local port. 653 */ 654 if (sin6->sin6_port == 0) { 655 error = EADDRNOTAVAIL; 656 goto release; 657 } 658 659 if (!IN6_IS_ADDR_UNSPECIFIED(&inp->in6p_faddr)) { 660 /* how about ::ffff:0.0.0.0 case? */ 661 error = EISCONN; 662 goto release; 663 } 664 665 fport = sin6->sin6_port; /* allow 0 port */ 666 667 if (IN6_IS_ADDR_V4MAPPED(faddr)) { 668 if ((inp->inp_flags & IN6P_IPV6_V6ONLY)) { 669 /* 670 * I believe we should explicitly discard the 671 * packet when mapped addresses are disabled, 672 * rather than send the packet as an IPv6 one. 673 * If we chose the latter approach, the packet 674 * might be sent out on the wire based on the 675 * default route, the situation which we'd 676 * probably want to avoid. 677 * (20010421 jinmei@kame.net) 678 */ 679 error = EINVAL; 680 goto release; 681 } 682 if (!IN6_IS_ADDR_UNSPECIFIED(&inp->in6p_laddr) && 683 !IN6_IS_ADDR_V4MAPPED(&inp->in6p_laddr)) { 684 /* 685 * when remote addr is an IPv4-mapped address, 686 * local addr should not be an IPv6 address, 687 * since you cannot determine how to map IPv6 688 * source address to IPv4. 689 */ 690 error = EINVAL; 691 goto release; 692 } 693 694 af = AF_INET; 695 } 696 697 if (!IN6_IS_ADDR_V4MAPPED(faddr)) { 698 error = in6_selectsrc(sin6, optp, inp, NULL, 699 td->td_ucred, &oifp, &in6a); 700 if (error) 701 goto release; 702 if (oifp && scope_ambiguous && 703 (error = in6_setscope(&sin6->sin6_addr, 704 oifp, NULL))) { 705 goto release; 706 } 707 laddr = &in6a; 708 } else 709 laddr = &inp->in6p_laddr; /* XXX */ 710 if (laddr == NULL) { 711 if (error == 0) 712 error = EADDRNOTAVAIL; 713 goto release; 714 } 715 if (inp->inp_lport == 0 && 716 (error = in6_pcbsetport(laddr, inp, td->td_ucred)) != 0) { 717 /* Undo an address bind that may have occurred. */ 718 inp->in6p_laddr = in6addr_any; 719 goto release; 720 } 721 } else { 722 if (IN6_IS_ADDR_UNSPECIFIED(&inp->in6p_faddr)) { 723 error = ENOTCONN; 724 goto release; 725 } 726 if (IN6_IS_ADDR_V4MAPPED(&inp->in6p_faddr)) { 727 if ((inp->inp_flags & IN6P_IPV6_V6ONLY)) { 728 /* 729 * XXX: this case would happen when the 730 * application sets the V6ONLY flag after 731 * connecting the foreign address. 732 * Such applications should be fixed, 733 * so we bark here. 734 */ 735 log(LOG_INFO, "udp6_output: IPV6_V6ONLY " 736 "option was set for a connected socket\n"); 737 error = EINVAL; 738 goto release; 739 } else 740 af = AF_INET; 741 } 742 laddr = &inp->in6p_laddr; 743 faddr = &inp->in6p_faddr; 744 fport = inp->inp_fport; 745 } 746 747 if (af == AF_INET) 748 hlen = sizeof(struct ip); 749 750 /* 751 * Calculate data length and get a mbuf 752 * for UDP and IP6 headers. 753 */ 754 M_PREPEND(m, hlen + sizeof(struct udphdr), M_DONTWAIT); 755 if (m == 0) { 756 error = ENOBUFS; 757 goto release; 758 } 759 760 /* 761 * Stuff checksum and output datagram. 762 */ 763 udp6 = (struct udphdr *)(mtod(m, caddr_t) + hlen); 764 udp6->uh_sport = inp->inp_lport; /* lport is always set in the PCB */ 765 udp6->uh_dport = fport; 766 if (plen <= 0xffff) 767 udp6->uh_ulen = htons((u_short)plen); 768 else 769 udp6->uh_ulen = 0; 770 udp6->uh_sum = 0; 771 772 switch (af) { 773 case AF_INET6: 774 ip6 = mtod(m, struct ip6_hdr *); 775 ip6->ip6_flow = inp->inp_flow & IPV6_FLOWINFO_MASK; 776 ip6->ip6_vfc &= ~IPV6_VERSION_MASK; 777 ip6->ip6_vfc |= IPV6_VERSION; 778 #if 0 /* ip6_plen will be filled in ip6_output. */ 779 ip6->ip6_plen = htons((u_short)plen); 780 #endif 781 ip6->ip6_nxt = IPPROTO_UDP; 782 ip6->ip6_hlim = in6_selecthlim(inp, NULL); 783 ip6->ip6_src = *laddr; 784 ip6->ip6_dst = *faddr; 785 786 udp6->uh_sum = in6_cksum_pseudo(ip6, plen, IPPROTO_UDP, 0); 787 m->m_pkthdr.csum_flags = CSUM_UDP_IPV6; 788 m->m_pkthdr.csum_data = offsetof(struct udphdr, uh_sum); 789 790 flags = 0; 791 792 UDPSTAT_INC(udps_opackets); 793 error = ip6_output(m, optp, NULL, flags, inp->in6p_moptions, 794 NULL, inp); 795 break; 796 case AF_INET: 797 error = EAFNOSUPPORT; 798 goto release; 799 } 800 goto releaseopt; 801 802 release: 803 m_freem(m); 804 805 releaseopt: 806 if (control) { 807 ip6_clearpktopts(&opt, -1); 808 m_freem(control); 809 } 810 return (error); 811 } 812 813 static void 814 udp6_abort(struct socket *so) 815 { 816 struct inpcb *inp; 817 818 inp = sotoinpcb(so); 819 KASSERT(inp != NULL, ("udp6_abort: inp == NULL")); 820 821 #ifdef INET 822 if (inp->inp_vflag & INP_IPV4) { 823 struct pr_usrreqs *pru; 824 825 pru = inetsw[ip_protox[IPPROTO_UDP]].pr_usrreqs; 826 (*pru->pru_abort)(so); 827 return; 828 } 829 #endif 830 831 INP_WLOCK(inp); 832 if (!IN6_IS_ADDR_UNSPECIFIED(&inp->in6p_faddr)) { 833 INP_HASH_WLOCK(&V_udbinfo); 834 in6_pcbdisconnect(inp); 835 inp->in6p_laddr = in6addr_any; 836 INP_HASH_WUNLOCK(&V_udbinfo); 837 soisdisconnected(so); 838 } 839 INP_WUNLOCK(inp); 840 } 841 842 static int 843 udp6_attach(struct socket *so, int proto, struct thread *td) 844 { 845 struct inpcb *inp; 846 int error; 847 848 inp = sotoinpcb(so); 849 KASSERT(inp == NULL, ("udp6_attach: inp != NULL")); 850 851 if (so->so_snd.sb_hiwat == 0 || so->so_rcv.sb_hiwat == 0) { 852 error = soreserve(so, udp_sendspace, udp_recvspace); 853 if (error) 854 return (error); 855 } 856 INP_INFO_WLOCK(&V_udbinfo); 857 error = in_pcballoc(so, &V_udbinfo); 858 if (error) { 859 INP_INFO_WUNLOCK(&V_udbinfo); 860 return (error); 861 } 862 inp = (struct inpcb *)so->so_pcb; 863 inp->inp_vflag |= INP_IPV6; 864 if ((inp->inp_flags & IN6P_IPV6_V6ONLY) == 0) 865 inp->inp_vflag |= INP_IPV4; 866 inp->in6p_hops = -1; /* use kernel default */ 867 inp->in6p_cksum = -1; /* just to be sure */ 868 /* 869 * XXX: ugly!! 870 * IPv4 TTL initialization is necessary for an IPv6 socket as well, 871 * because the socket may be bound to an IPv6 wildcard address, 872 * which may match an IPv4-mapped IPv6 address. 873 */ 874 inp->inp_ip_ttl = V_ip_defttl; 875 876 error = udp_newudpcb(inp); 877 if (error) { 878 in_pcbdetach(inp); 879 in_pcbfree(inp); 880 INP_INFO_WUNLOCK(&V_udbinfo); 881 return (error); 882 } 883 INP_WUNLOCK(inp); 884 INP_INFO_WUNLOCK(&V_udbinfo); 885 return (0); 886 } 887 888 static int 889 udp6_bind(struct socket *so, struct sockaddr *nam, struct thread *td) 890 { 891 struct inpcb *inp; 892 int error; 893 894 inp = sotoinpcb(so); 895 KASSERT(inp != NULL, ("udp6_bind: inp == NULL")); 896 897 INP_WLOCK(inp); 898 INP_HASH_WLOCK(&V_udbinfo); 899 inp->inp_vflag &= ~INP_IPV4; 900 inp->inp_vflag |= INP_IPV6; 901 if ((inp->inp_flags & IN6P_IPV6_V6ONLY) == 0) { 902 struct sockaddr_in6 *sin6_p; 903 904 sin6_p = (struct sockaddr_in6 *)nam; 905 906 if (IN6_IS_ADDR_UNSPECIFIED(&sin6_p->sin6_addr)) 907 inp->inp_vflag |= INP_IPV4; 908 #ifdef INET 909 else if (IN6_IS_ADDR_V4MAPPED(&sin6_p->sin6_addr)) { 910 struct sockaddr_in sin; 911 912 in6_sin6_2_sin(&sin, sin6_p); 913 inp->inp_vflag |= INP_IPV4; 914 inp->inp_vflag &= ~INP_IPV6; 915 error = in_pcbbind(inp, (struct sockaddr *)&sin, 916 td->td_ucred); 917 goto out; 918 } 919 #endif 920 } 921 922 error = in6_pcbbind(inp, nam, td->td_ucred); 923 #ifdef INET 924 out: 925 #endif 926 INP_HASH_WUNLOCK(&V_udbinfo); 927 INP_WUNLOCK(inp); 928 return (error); 929 } 930 931 static void 932 udp6_close(struct socket *so) 933 { 934 struct inpcb *inp; 935 936 inp = sotoinpcb(so); 937 KASSERT(inp != NULL, ("udp6_close: inp == NULL")); 938 939 #ifdef INET 940 if (inp->inp_vflag & INP_IPV4) { 941 struct pr_usrreqs *pru; 942 943 pru = inetsw[ip_protox[IPPROTO_UDP]].pr_usrreqs; 944 (*pru->pru_disconnect)(so); 945 return; 946 } 947 #endif 948 INP_WLOCK(inp); 949 if (!IN6_IS_ADDR_UNSPECIFIED(&inp->in6p_faddr)) { 950 INP_HASH_WLOCK(&V_udbinfo); 951 in6_pcbdisconnect(inp); 952 inp->in6p_laddr = in6addr_any; 953 INP_HASH_WUNLOCK(&V_udbinfo); 954 soisdisconnected(so); 955 } 956 INP_WUNLOCK(inp); 957 } 958 959 static int 960 udp6_connect(struct socket *so, struct sockaddr *nam, struct thread *td) 961 { 962 struct inpcb *inp; 963 struct sockaddr_in6 *sin6; 964 int error; 965 966 inp = sotoinpcb(so); 967 sin6 = (struct sockaddr_in6 *)nam; 968 KASSERT(inp != NULL, ("udp6_connect: inp == NULL")); 969 970 /* 971 * XXXRW: Need to clarify locking of v4/v6 flags. 972 */ 973 INP_WLOCK(inp); 974 #ifdef INET 975 if (IN6_IS_ADDR_V4MAPPED(&sin6->sin6_addr)) { 976 struct sockaddr_in sin; 977 978 if ((inp->inp_flags & IN6P_IPV6_V6ONLY) != 0) { 979 error = EINVAL; 980 goto out; 981 } 982 if (inp->inp_faddr.s_addr != INADDR_ANY) { 983 error = EISCONN; 984 goto out; 985 } 986 in6_sin6_2_sin(&sin, sin6); 987 inp->inp_vflag |= INP_IPV4; 988 inp->inp_vflag &= ~INP_IPV6; 989 error = prison_remote_ip4(td->td_ucred, &sin.sin_addr); 990 if (error != 0) 991 goto out; 992 INP_HASH_WLOCK(&V_udbinfo); 993 error = in_pcbconnect(inp, (struct sockaddr *)&sin, 994 td->td_ucred); 995 INP_HASH_WUNLOCK(&V_udbinfo); 996 if (error == 0) 997 soisconnected(so); 998 goto out; 999 } 1000 #endif 1001 if (!IN6_IS_ADDR_UNSPECIFIED(&inp->in6p_faddr)) { 1002 error = EISCONN; 1003 goto out; 1004 } 1005 inp->inp_vflag &= ~INP_IPV4; 1006 inp->inp_vflag |= INP_IPV6; 1007 error = prison_remote_ip6(td->td_ucred, &sin6->sin6_addr); 1008 if (error != 0) 1009 goto out; 1010 INP_HASH_WLOCK(&V_udbinfo); 1011 error = in6_pcbconnect(inp, nam, td->td_ucred); 1012 INP_HASH_WUNLOCK(&V_udbinfo); 1013 if (error == 0) 1014 soisconnected(so); 1015 out: 1016 INP_WUNLOCK(inp); 1017 return (error); 1018 } 1019 1020 static void 1021 udp6_detach(struct socket *so) 1022 { 1023 struct inpcb *inp; 1024 struct udpcb *up; 1025 1026 inp = sotoinpcb(so); 1027 KASSERT(inp != NULL, ("udp6_detach: inp == NULL")); 1028 1029 INP_INFO_WLOCK(&V_udbinfo); 1030 INP_WLOCK(inp); 1031 up = intoudpcb(inp); 1032 KASSERT(up != NULL, ("%s: up == NULL", __func__)); 1033 in_pcbdetach(inp); 1034 in_pcbfree(inp); 1035 INP_INFO_WUNLOCK(&V_udbinfo); 1036 udp_discardcb(up); 1037 } 1038 1039 static int 1040 udp6_disconnect(struct socket *so) 1041 { 1042 struct inpcb *inp; 1043 int error; 1044 1045 inp = sotoinpcb(so); 1046 KASSERT(inp != NULL, ("udp6_disconnect: inp == NULL")); 1047 1048 #ifdef INET 1049 if (inp->inp_vflag & INP_IPV4) { 1050 struct pr_usrreqs *pru; 1051 1052 pru = inetsw[ip_protox[IPPROTO_UDP]].pr_usrreqs; 1053 (void)(*pru->pru_disconnect)(so); 1054 return (0); 1055 } 1056 #endif 1057 1058 INP_WLOCK(inp); 1059 1060 if (IN6_IS_ADDR_UNSPECIFIED(&inp->in6p_faddr)) { 1061 error = ENOTCONN; 1062 goto out; 1063 } 1064 1065 INP_HASH_WLOCK(&V_udbinfo); 1066 in6_pcbdisconnect(inp); 1067 inp->in6p_laddr = in6addr_any; 1068 INP_HASH_WUNLOCK(&V_udbinfo); 1069 SOCK_LOCK(so); 1070 so->so_state &= ~SS_ISCONNECTED; /* XXX */ 1071 SOCK_UNLOCK(so); 1072 out: 1073 INP_WUNLOCK(inp); 1074 return (0); 1075 } 1076 1077 static int 1078 udp6_send(struct socket *so, int flags, struct mbuf *m, 1079 struct sockaddr *addr, struct mbuf *control, struct thread *td) 1080 { 1081 struct inpcb *inp; 1082 int error = 0; 1083 1084 inp = sotoinpcb(so); 1085 KASSERT(inp != NULL, ("udp6_send: inp == NULL")); 1086 1087 INP_WLOCK(inp); 1088 if (addr) { 1089 if (addr->sa_len != sizeof(struct sockaddr_in6)) { 1090 error = EINVAL; 1091 goto bad; 1092 } 1093 if (addr->sa_family != AF_INET6) { 1094 error = EAFNOSUPPORT; 1095 goto bad; 1096 } 1097 } 1098 1099 #ifdef INET 1100 if ((inp->inp_flags & IN6P_IPV6_V6ONLY) == 0) { 1101 int hasv4addr; 1102 struct sockaddr_in6 *sin6 = 0; 1103 1104 if (addr == 0) 1105 hasv4addr = (inp->inp_vflag & INP_IPV4); 1106 else { 1107 sin6 = (struct sockaddr_in6 *)addr; 1108 hasv4addr = IN6_IS_ADDR_V4MAPPED(&sin6->sin6_addr) 1109 ? 1 : 0; 1110 } 1111 if (hasv4addr) { 1112 struct pr_usrreqs *pru; 1113 1114 /* 1115 * XXXRW: We release UDP-layer locks before calling 1116 * udp_send() in order to avoid recursion. However, 1117 * this does mean there is a short window where inp's 1118 * fields are unstable. Could this lead to a 1119 * potential race in which the factors causing us to 1120 * select the UDPv4 output routine are invalidated? 1121 */ 1122 INP_WUNLOCK(inp); 1123 if (sin6) 1124 in6_sin6_2_sin_in_sock(addr); 1125 pru = inetsw[ip_protox[IPPROTO_UDP]].pr_usrreqs; 1126 /* addr will just be freed in sendit(). */ 1127 return ((*pru->pru_send)(so, flags, m, addr, control, 1128 td)); 1129 } 1130 } 1131 #endif 1132 #ifdef MAC 1133 mac_inpcb_create_mbuf(inp, m); 1134 #endif 1135 INP_HASH_WLOCK(&V_udbinfo); 1136 error = udp6_output(inp, m, addr, control, td); 1137 INP_HASH_WUNLOCK(&V_udbinfo); 1138 #ifdef INET 1139 #endif 1140 INP_WUNLOCK(inp); 1141 return (error); 1142 1143 bad: 1144 INP_WUNLOCK(inp); 1145 m_freem(m); 1146 return (error); 1147 } 1148 1149 struct pr_usrreqs udp6_usrreqs = { 1150 .pru_abort = udp6_abort, 1151 .pru_attach = udp6_attach, 1152 .pru_bind = udp6_bind, 1153 .pru_connect = udp6_connect, 1154 .pru_control = in6_control, 1155 .pru_detach = udp6_detach, 1156 .pru_disconnect = udp6_disconnect, 1157 .pru_peeraddr = in6_mapped_peeraddr, 1158 .pru_send = udp6_send, 1159 .pru_shutdown = udp_shutdown, 1160 .pru_sockaddr = in6_mapped_sockaddr, 1161 .pru_soreceive = soreceive_dgram, 1162 .pru_sosend = sosend_dgram, 1163 .pru_sosetlabel = in_pcbsosetlabel, 1164 .pru_close = udp6_close 1165 };
Cache object: 23e8d74f0777cdcfe81118ded44a2921
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