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("$FreeBSD$"); 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 188 189 ifp = m->m_pkthdr.rcvif; 190 ip6 = mtod(m, struct ip6_hdr *); 191 192 if (faithprefix_p != NULL && (*faithprefix_p)(&ip6->ip6_dst)) { 193 /* XXX send icmp6 host/port unreach? */ 194 m_freem(m); 195 return (IPPROTO_DONE); 196 } 197 198 #ifndef PULLDOWN_TEST 199 IP6_EXTHDR_CHECK(m, off, sizeof(struct udphdr), IPPROTO_DONE); 200 ip6 = mtod(m, struct ip6_hdr *); 201 uh = (struct udphdr *)((caddr_t)ip6 + off); 202 #else 203 IP6_EXTHDR_GET(uh, struct udphdr *, m, off, sizeof(*uh)); 204 if (!uh) 205 return (IPPROTO_DONE); 206 #endif 207 208 UDPSTAT_INC(udps_ipackets); 209 210 /* 211 * Destination port of 0 is illegal, based on RFC768. 212 */ 213 if (uh->uh_dport == 0) 214 goto badunlocked; 215 216 plen = ntohs(ip6->ip6_plen) - off + sizeof(*ip6); 217 ulen = ntohs((u_short)uh->uh_ulen); 218 219 if (plen != ulen) { 220 UDPSTAT_INC(udps_badlen); 221 goto badunlocked; 222 } 223 224 /* 225 * Checksum extended UDP header and data. 226 */ 227 if (uh->uh_sum == 0) { 228 UDPSTAT_INC(udps_nosum); 229 goto badunlocked; 230 } 231 if (in6_cksum(m, IPPROTO_UDP, off, ulen) != 0) { 232 UDPSTAT_INC(udps_badsum); 233 goto badunlocked; 234 } 235 236 /* 237 * Construct sockaddr format source address. 238 */ 239 init_sin6(&fromsa, m); 240 fromsa.sin6_port = uh->uh_sport; 241 242 if (IN6_IS_ADDR_MULTICAST(&ip6->ip6_dst)) { 243 struct inpcb *last; 244 struct ip6_moptions *imo; 245 246 INP_INFO_RLOCK(&V_udbinfo); 247 /* 248 * In the event that laddr should be set to the link-local 249 * address (this happens in RIPng), the multicast address 250 * specified in the received packet will not match laddr. To 251 * handle this situation, matching is relaxed if the 252 * receiving interface is the same as one specified in the 253 * socket and if the destination multicast address matches 254 * one of the multicast groups specified in the socket. 255 */ 256 257 /* 258 * KAME note: traditionally we dropped udpiphdr from mbuf 259 * here. We need udphdr for IPsec processing so we do that 260 * later. 261 */ 262 last = NULL; 263 LIST_FOREACH(inp, &V_udb, inp_list) { 264 if ((inp->inp_vflag & INP_IPV6) == 0) 265 continue; 266 if (inp->inp_lport != uh->uh_dport) 267 continue; 268 if (inp->inp_fport != 0 && 269 inp->inp_fport != uh->uh_sport) 270 continue; 271 if (!IN6_IS_ADDR_UNSPECIFIED(&inp->in6p_laddr)) { 272 if (!IN6_ARE_ADDR_EQUAL(&inp->in6p_laddr, 273 &ip6->ip6_dst)) 274 continue; 275 } 276 if (!IN6_IS_ADDR_UNSPECIFIED(&inp->in6p_faddr)) { 277 if (!IN6_ARE_ADDR_EQUAL(&inp->in6p_faddr, 278 &ip6->ip6_src) || 279 inp->inp_fport != uh->uh_sport) 280 continue; 281 } 282 283 /* 284 * XXXRW: Because we weren't holding either the inpcb 285 * or the hash lock when we checked for a match 286 * before, we should probably recheck now that the 287 * inpcb lock is (supposed to be) held. 288 */ 289 290 /* 291 * Handle socket delivery policy for any-source 292 * and source-specific multicast. [RFC3678] 293 */ 294 imo = inp->in6p_moptions; 295 if (imo && IN6_IS_ADDR_MULTICAST(&ip6->ip6_dst)) { 296 struct sockaddr_in6 mcaddr; 297 int blocked; 298 299 INP_RLOCK(inp); 300 301 bzero(&mcaddr, sizeof(struct sockaddr_in6)); 302 mcaddr.sin6_len = sizeof(struct sockaddr_in6); 303 mcaddr.sin6_family = AF_INET6; 304 mcaddr.sin6_addr = ip6->ip6_dst; 305 306 blocked = im6o_mc_filter(imo, ifp, 307 (struct sockaddr *)&mcaddr, 308 (struct sockaddr *)&fromsa); 309 if (blocked != MCAST_PASS) { 310 if (blocked == MCAST_NOTGMEMBER) 311 IP6STAT_INC(ip6s_notmember); 312 if (blocked == MCAST_NOTSMEMBER || 313 blocked == MCAST_MUTED) 314 UDPSTAT_INC(udps_filtermcast); 315 INP_RUNLOCK(inp); /* XXX */ 316 continue; 317 } 318 319 INP_RUNLOCK(inp); 320 } 321 if (last != NULL) { 322 struct mbuf *n; 323 324 if ((n = m_copy(m, 0, M_COPYALL)) != NULL) { 325 INP_RLOCK(last); 326 up = intoudpcb(last); 327 if (up->u_tun_func == NULL) { 328 udp6_append(last, n, off, &fromsa); 329 } else { 330 /* 331 * Engage the tunneling 332 * protocol we will have to 333 * leave the info_lock up, 334 * since we are hunting 335 * through multiple UDP's. 336 * 337 */ 338 (*up->u_tun_func)(n, off, last); 339 } 340 INP_RUNLOCK(last); 341 } 342 } 343 last = inp; 344 /* 345 * Don't look for additional matches if this one does 346 * not have either the SO_REUSEPORT or SO_REUSEADDR 347 * socket options set. This heuristic avoids 348 * searching through all pcbs in the common case of a 349 * non-shared port. It assumes that an application 350 * will never clear these options after setting them. 351 */ 352 if ((last->inp_socket->so_options & 353 (SO_REUSEPORT|SO_REUSEADDR)) == 0) 354 break; 355 } 356 357 if (last == NULL) { 358 /* 359 * No matching pcb found; discard datagram. (No need 360 * to send an ICMP Port Unreachable for a broadcast 361 * or multicast datgram.) 362 */ 363 UDPSTAT_INC(udps_noport); 364 UDPSTAT_INC(udps_noportmcast); 365 goto badheadlocked; 366 } 367 INP_RLOCK(last); 368 INP_INFO_RUNLOCK(&V_udbinfo); 369 up = intoudpcb(last); 370 if (up->u_tun_func == NULL) { 371 udp6_append(last, m, off, &fromsa); 372 } else { 373 /* 374 * Engage the tunneling protocol. 375 */ 376 (*up->u_tun_func)(m, off, last); 377 } 378 INP_RUNLOCK(last); 379 return (IPPROTO_DONE); 380 } 381 /* 382 * Locate pcb for datagram. 383 */ 384 #ifdef IPFIREWALL_FORWARD 385 /* 386 * Grab info from PACKET_TAG_IPFORWARD tag prepended to the chain. 387 */ 388 fwd_tag = m_tag_find(m, PACKET_TAG_IPFORWARD, NULL); 389 if (fwd_tag != NULL) { 390 struct sockaddr_in6 *next_hop6; 391 392 next_hop6 = (struct sockaddr_in6 *)(fwd_tag + 1); 393 394 /* 395 * Transparently forwarded. Pretend to be the destination. 396 * Already got one like this? 397 */ 398 inp = in6_pcblookup_mbuf(&V_udbinfo, 399 &ip6->ip6_src, uh->uh_sport, &ip6->ip6_dst, uh->uh_dport, 400 INPLOOKUP_RLOCKPCB, m->m_pkthdr.rcvif, m); 401 if (!inp) { 402 /* 403 * It's new. Try to find the ambushing socket. 404 * Because we've rewritten the destination address, 405 * any hardware-generated hash is ignored. 406 */ 407 inp = in6_pcblookup(&V_udbinfo, &ip6->ip6_src, 408 uh->uh_sport, &next_hop6->sin6_addr, 409 next_hop6->sin6_port ? htons(next_hop6->sin6_port) : 410 uh->uh_dport, INPLOOKUP_WILDCARD | 411 INPLOOKUP_RLOCKPCB, m->m_pkthdr.rcvif); 412 } 413 /* Remove the tag from the packet. We don't need it anymore. */ 414 m_tag_delete(m, fwd_tag); 415 } else 416 #endif /* IPFIREWALL_FORWARD */ 417 inp = in6_pcblookup_mbuf(&V_udbinfo, &ip6->ip6_src, 418 uh->uh_sport, &ip6->ip6_dst, uh->uh_dport, 419 INPLOOKUP_WILDCARD | INPLOOKUP_RLOCKPCB, 420 m->m_pkthdr.rcvif, m); 421 if (inp == NULL) { 422 if (udp_log_in_vain) { 423 char ip6bufs[INET6_ADDRSTRLEN]; 424 char ip6bufd[INET6_ADDRSTRLEN]; 425 426 log(LOG_INFO, 427 "Connection attempt to UDP [%s]:%d from [%s]:%d\n", 428 ip6_sprintf(ip6bufd, &ip6->ip6_dst), 429 ntohs(uh->uh_dport), 430 ip6_sprintf(ip6bufs, &ip6->ip6_src), 431 ntohs(uh->uh_sport)); 432 } 433 UDPSTAT_INC(udps_noport); 434 if (m->m_flags & M_MCAST) { 435 printf("UDP6: M_MCAST is set in a unicast packet.\n"); 436 UDPSTAT_INC(udps_noportmcast); 437 goto badunlocked; 438 } 439 if (V_udp_blackhole) 440 goto badunlocked; 441 if (badport_bandlim(BANDLIM_ICMP6_UNREACH) < 0) 442 goto badunlocked; 443 icmp6_error(m, ICMP6_DST_UNREACH, ICMP6_DST_UNREACH_NOPORT, 0); 444 return (IPPROTO_DONE); 445 } 446 INP_RLOCK_ASSERT(inp); 447 up = intoudpcb(inp); 448 if (up->u_tun_func == NULL) { 449 udp6_append(inp, m, off, &fromsa); 450 } else { 451 /* 452 * Engage the tunneling protocol. 453 */ 454 455 (*up->u_tun_func)(m, off, inp); 456 } 457 INP_RUNLOCK(inp); 458 return (IPPROTO_DONE); 459 460 badheadlocked: 461 INP_INFO_RUNLOCK(&V_udbinfo); 462 badunlocked: 463 if (m) 464 m_freem(m); 465 return (IPPROTO_DONE); 466 } 467 468 void 469 udp6_ctlinput(int cmd, struct sockaddr *sa, void *d) 470 { 471 struct udphdr uh; 472 struct ip6_hdr *ip6; 473 struct mbuf *m; 474 int off = 0; 475 struct ip6ctlparam *ip6cp = NULL; 476 const struct sockaddr_in6 *sa6_src = NULL; 477 void *cmdarg; 478 struct inpcb *(*notify)(struct inpcb *, int) = udp_notify; 479 struct udp_portonly { 480 u_int16_t uh_sport; 481 u_int16_t uh_dport; 482 } *uhp; 483 484 if (sa->sa_family != AF_INET6 || 485 sa->sa_len != sizeof(struct sockaddr_in6)) 486 return; 487 488 if ((unsigned)cmd >= PRC_NCMDS) 489 return; 490 if (PRC_IS_REDIRECT(cmd)) 491 notify = in6_rtchange, d = NULL; 492 else if (cmd == PRC_HOSTDEAD) 493 d = NULL; 494 else if (inet6ctlerrmap[cmd] == 0) 495 return; 496 497 /* if the parameter is from icmp6, decode it. */ 498 if (d != NULL) { 499 ip6cp = (struct ip6ctlparam *)d; 500 m = ip6cp->ip6c_m; 501 ip6 = ip6cp->ip6c_ip6; 502 off = ip6cp->ip6c_off; 503 cmdarg = ip6cp->ip6c_cmdarg; 504 sa6_src = ip6cp->ip6c_src; 505 } else { 506 m = NULL; 507 ip6 = NULL; 508 cmdarg = NULL; 509 sa6_src = &sa6_any; 510 } 511 512 if (ip6) { 513 /* 514 * XXX: We assume that when IPV6 is non NULL, 515 * M and OFF are valid. 516 */ 517 518 /* Check if we can safely examine src and dst ports. */ 519 if (m->m_pkthdr.len < off + sizeof(*uhp)) 520 return; 521 522 bzero(&uh, sizeof(uh)); 523 m_copydata(m, off, sizeof(*uhp), (caddr_t)&uh); 524 525 (void) in6_pcbnotify(&V_udbinfo, sa, uh.uh_dport, 526 (struct sockaddr *)ip6cp->ip6c_src, uh.uh_sport, cmd, 527 cmdarg, notify); 528 } else 529 (void) in6_pcbnotify(&V_udbinfo, sa, 0, 530 (const struct sockaddr *)sa6_src, 0, cmd, cmdarg, notify); 531 } 532 533 static int 534 udp6_getcred(SYSCTL_HANDLER_ARGS) 535 { 536 struct xucred xuc; 537 struct sockaddr_in6 addrs[2]; 538 struct inpcb *inp; 539 int error; 540 541 error = priv_check(req->td, PRIV_NETINET_GETCRED); 542 if (error) 543 return (error); 544 545 if (req->newlen != sizeof(addrs)) 546 return (EINVAL); 547 if (req->oldlen != sizeof(struct xucred)) 548 return (EINVAL); 549 error = SYSCTL_IN(req, addrs, sizeof(addrs)); 550 if (error) 551 return (error); 552 if ((error = sa6_embedscope(&addrs[0], V_ip6_use_defzone)) != 0 || 553 (error = sa6_embedscope(&addrs[1], V_ip6_use_defzone)) != 0) { 554 return (error); 555 } 556 inp = in6_pcblookup(&V_udbinfo, &addrs[1].sin6_addr, 557 addrs[1].sin6_port, &addrs[0].sin6_addr, addrs[0].sin6_port, 558 INPLOOKUP_WILDCARD | INPLOOKUP_RLOCKPCB, NULL); 559 if (inp != NULL) { 560 INP_RLOCK_ASSERT(inp); 561 if (inp->inp_socket == NULL) 562 error = ENOENT; 563 if (error == 0) 564 error = cr_canseesocket(req->td->td_ucred, 565 inp->inp_socket); 566 if (error == 0) 567 cru2x(inp->inp_cred, &xuc); 568 INP_RUNLOCK(inp); 569 } else 570 error = ENOENT; 571 if (error == 0) 572 error = SYSCTL_OUT(req, &xuc, sizeof(struct xucred)); 573 return (error); 574 } 575 576 SYSCTL_PROC(_net_inet6_udp6, OID_AUTO, getcred, CTLTYPE_OPAQUE|CTLFLAG_RW, 0, 577 0, udp6_getcred, "S,xucred", "Get the xucred of a UDP6 connection"); 578 579 static int 580 udp6_output(struct inpcb *inp, struct mbuf *m, struct sockaddr *addr6, 581 struct mbuf *control, struct thread *td) 582 { 583 u_int32_t ulen = m->m_pkthdr.len; 584 u_int32_t plen = sizeof(struct udphdr) + ulen; 585 struct ip6_hdr *ip6; 586 struct udphdr *udp6; 587 struct in6_addr *laddr, *faddr, in6a; 588 struct sockaddr_in6 *sin6 = NULL; 589 struct ifnet *oifp = NULL; 590 int scope_ambiguous = 0; 591 u_short fport; 592 int error = 0; 593 struct ip6_pktopts *optp, opt; 594 int af = AF_INET6, hlen = sizeof(struct ip6_hdr); 595 int flags; 596 struct sockaddr_in6 tmp; 597 598 INP_WLOCK_ASSERT(inp); 599 INP_HASH_WLOCK_ASSERT(inp->inp_pcbinfo); 600 601 if (addr6) { 602 /* addr6 has been validated in udp6_send(). */ 603 sin6 = (struct sockaddr_in6 *)addr6; 604 605 /* protect *sin6 from overwrites */ 606 tmp = *sin6; 607 sin6 = &tmp; 608 609 /* 610 * Application should provide a proper zone ID or the use of 611 * default zone IDs should be enabled. Unfortunately, some 612 * applications do not behave as it should, so we need a 613 * workaround. Even if an appropriate ID is not determined, 614 * we'll see if we can determine the outgoing interface. If we 615 * can, determine the zone ID based on the interface below. 616 */ 617 if (sin6->sin6_scope_id == 0 && !V_ip6_use_defzone) 618 scope_ambiguous = 1; 619 if ((error = sa6_embedscope(sin6, V_ip6_use_defzone)) != 0) 620 return (error); 621 } 622 623 if (control) { 624 if ((error = ip6_setpktopts(control, &opt, 625 inp->in6p_outputopts, td->td_ucred, IPPROTO_UDP)) != 0) 626 goto release; 627 optp = &opt; 628 } else 629 optp = inp->in6p_outputopts; 630 631 if (sin6) { 632 faddr = &sin6->sin6_addr; 633 634 /* 635 * IPv4 version of udp_output calls in_pcbconnect in this case, 636 * which needs splnet and affects performance. 637 * Since we saw no essential reason for calling in_pcbconnect, 638 * we get rid of such kind of logic, and call in6_selectsrc 639 * and in6_pcbsetport in order to fill in the local address 640 * and the local port. 641 */ 642 if (sin6->sin6_port == 0) { 643 error = EADDRNOTAVAIL; 644 goto release; 645 } 646 647 if (!IN6_IS_ADDR_UNSPECIFIED(&inp->in6p_faddr)) { 648 /* how about ::ffff:0.0.0.0 case? */ 649 error = EISCONN; 650 goto release; 651 } 652 653 fport = sin6->sin6_port; /* allow 0 port */ 654 655 if (IN6_IS_ADDR_V4MAPPED(faddr)) { 656 if ((inp->inp_flags & IN6P_IPV6_V6ONLY)) { 657 /* 658 * I believe we should explicitly discard the 659 * packet when mapped addresses are disabled, 660 * rather than send the packet as an IPv6 one. 661 * If we chose the latter approach, the packet 662 * might be sent out on the wire based on the 663 * default route, the situation which we'd 664 * probably want to avoid. 665 * (20010421 jinmei@kame.net) 666 */ 667 error = EINVAL; 668 goto release; 669 } 670 if (!IN6_IS_ADDR_UNSPECIFIED(&inp->in6p_laddr) && 671 !IN6_IS_ADDR_V4MAPPED(&inp->in6p_laddr)) { 672 /* 673 * when remote addr is an IPv4-mapped address, 674 * local addr should not be an IPv6 address, 675 * since you cannot determine how to map IPv6 676 * source address to IPv4. 677 */ 678 error = EINVAL; 679 goto release; 680 } 681 682 af = AF_INET; 683 } 684 685 if (!IN6_IS_ADDR_V4MAPPED(faddr)) { 686 error = in6_selectsrc(sin6, optp, inp, NULL, 687 td->td_ucred, &oifp, &in6a); 688 if (error) 689 goto release; 690 if (oifp && scope_ambiguous && 691 (error = in6_setscope(&sin6->sin6_addr, 692 oifp, NULL))) { 693 goto release; 694 } 695 laddr = &in6a; 696 } else 697 laddr = &inp->in6p_laddr; /* XXX */ 698 if (laddr == NULL) { 699 if (error == 0) 700 error = EADDRNOTAVAIL; 701 goto release; 702 } 703 if (inp->inp_lport == 0 && 704 (error = in6_pcbsetport(laddr, inp, td->td_ucred)) != 0) { 705 /* Undo an address bind that may have occurred. */ 706 inp->in6p_laddr = in6addr_any; 707 goto release; 708 } 709 } else { 710 if (IN6_IS_ADDR_UNSPECIFIED(&inp->in6p_faddr)) { 711 error = ENOTCONN; 712 goto release; 713 } 714 if (IN6_IS_ADDR_V4MAPPED(&inp->in6p_faddr)) { 715 if ((inp->inp_flags & IN6P_IPV6_V6ONLY)) { 716 /* 717 * XXX: this case would happen when the 718 * application sets the V6ONLY flag after 719 * connecting the foreign address. 720 * Such applications should be fixed, 721 * so we bark here. 722 */ 723 log(LOG_INFO, "udp6_output: IPV6_V6ONLY " 724 "option was set for a connected socket\n"); 725 error = EINVAL; 726 goto release; 727 } else 728 af = AF_INET; 729 } 730 laddr = &inp->in6p_laddr; 731 faddr = &inp->in6p_faddr; 732 fport = inp->inp_fport; 733 } 734 735 if (af == AF_INET) 736 hlen = sizeof(struct ip); 737 738 /* 739 * Calculate data length and get a mbuf 740 * for UDP and IP6 headers. 741 */ 742 M_PREPEND(m, hlen + sizeof(struct udphdr), M_DONTWAIT); 743 if (m == 0) { 744 error = ENOBUFS; 745 goto release; 746 } 747 748 /* 749 * Stuff checksum and output datagram. 750 */ 751 udp6 = (struct udphdr *)(mtod(m, caddr_t) + hlen); 752 udp6->uh_sport = inp->inp_lport; /* lport is always set in the PCB */ 753 udp6->uh_dport = fport; 754 if (plen <= 0xffff) 755 udp6->uh_ulen = htons((u_short)plen); 756 else 757 udp6->uh_ulen = 0; 758 udp6->uh_sum = 0; 759 760 switch (af) { 761 case AF_INET6: 762 ip6 = mtod(m, struct ip6_hdr *); 763 ip6->ip6_flow = inp->inp_flow & IPV6_FLOWINFO_MASK; 764 ip6->ip6_vfc &= ~IPV6_VERSION_MASK; 765 ip6->ip6_vfc |= IPV6_VERSION; 766 #if 0 /* ip6_plen will be filled in ip6_output. */ 767 ip6->ip6_plen = htons((u_short)plen); 768 #endif 769 ip6->ip6_nxt = IPPROTO_UDP; 770 ip6->ip6_hlim = in6_selecthlim(inp, NULL); 771 ip6->ip6_src = *laddr; 772 ip6->ip6_dst = *faddr; 773 774 if ((udp6->uh_sum = in6_cksum(m, IPPROTO_UDP, 775 sizeof(struct ip6_hdr), plen)) == 0) { 776 udp6->uh_sum = 0xffff; 777 } 778 779 flags = 0; 780 781 UDPSTAT_INC(udps_opackets); 782 error = ip6_output(m, optp, NULL, flags, inp->in6p_moptions, 783 NULL, inp); 784 break; 785 case AF_INET: 786 error = EAFNOSUPPORT; 787 goto release; 788 } 789 goto releaseopt; 790 791 release: 792 m_freem(m); 793 794 releaseopt: 795 if (control) { 796 ip6_clearpktopts(&opt, -1); 797 m_freem(control); 798 } 799 return (error); 800 } 801 802 static void 803 udp6_abort(struct socket *so) 804 { 805 struct inpcb *inp; 806 807 inp = sotoinpcb(so); 808 KASSERT(inp != NULL, ("udp6_abort: inp == NULL")); 809 810 #ifdef INET 811 if (inp->inp_vflag & INP_IPV4) { 812 struct pr_usrreqs *pru; 813 814 pru = inetsw[ip_protox[IPPROTO_UDP]].pr_usrreqs; 815 (*pru->pru_abort)(so); 816 return; 817 } 818 #endif 819 820 INP_WLOCK(inp); 821 if (!IN6_IS_ADDR_UNSPECIFIED(&inp->in6p_faddr)) { 822 INP_HASH_WLOCK(&V_udbinfo); 823 in6_pcbdisconnect(inp); 824 inp->in6p_laddr = in6addr_any; 825 INP_HASH_WUNLOCK(&V_udbinfo); 826 soisdisconnected(so); 827 } 828 INP_WUNLOCK(inp); 829 } 830 831 static int 832 udp6_attach(struct socket *so, int proto, struct thread *td) 833 { 834 struct inpcb *inp; 835 int error; 836 837 inp = sotoinpcb(so); 838 KASSERT(inp == NULL, ("udp6_attach: inp != NULL")); 839 840 if (so->so_snd.sb_hiwat == 0 || so->so_rcv.sb_hiwat == 0) { 841 error = soreserve(so, udp_sendspace, udp_recvspace); 842 if (error) 843 return (error); 844 } 845 INP_INFO_WLOCK(&V_udbinfo); 846 error = in_pcballoc(so, &V_udbinfo); 847 if (error) { 848 INP_INFO_WUNLOCK(&V_udbinfo); 849 return (error); 850 } 851 inp = (struct inpcb *)so->so_pcb; 852 inp->inp_vflag |= INP_IPV6; 853 if ((inp->inp_flags & IN6P_IPV6_V6ONLY) == 0) 854 inp->inp_vflag |= INP_IPV4; 855 inp->in6p_hops = -1; /* use kernel default */ 856 inp->in6p_cksum = -1; /* just to be sure */ 857 /* 858 * XXX: ugly!! 859 * IPv4 TTL initialization is necessary for an IPv6 socket as well, 860 * because the socket may be bound to an IPv6 wildcard address, 861 * which may match an IPv4-mapped IPv6 address. 862 */ 863 inp->inp_ip_ttl = V_ip_defttl; 864 865 error = udp_newudpcb(inp); 866 if (error) { 867 in_pcbdetach(inp); 868 in_pcbfree(inp); 869 INP_INFO_WUNLOCK(&V_udbinfo); 870 return (error); 871 } 872 INP_WUNLOCK(inp); 873 INP_INFO_WUNLOCK(&V_udbinfo); 874 return (0); 875 } 876 877 static int 878 udp6_bind(struct socket *so, struct sockaddr *nam, struct thread *td) 879 { 880 struct inpcb *inp; 881 int error; 882 883 inp = sotoinpcb(so); 884 KASSERT(inp != NULL, ("udp6_bind: inp == NULL")); 885 886 INP_WLOCK(inp); 887 INP_HASH_WLOCK(&V_udbinfo); 888 inp->inp_vflag &= ~INP_IPV4; 889 inp->inp_vflag |= INP_IPV6; 890 if ((inp->inp_flags & IN6P_IPV6_V6ONLY) == 0) { 891 struct sockaddr_in6 *sin6_p; 892 893 sin6_p = (struct sockaddr_in6 *)nam; 894 895 if (IN6_IS_ADDR_UNSPECIFIED(&sin6_p->sin6_addr)) 896 inp->inp_vflag |= INP_IPV4; 897 #ifdef INET 898 else if (IN6_IS_ADDR_V4MAPPED(&sin6_p->sin6_addr)) { 899 struct sockaddr_in sin; 900 901 in6_sin6_2_sin(&sin, sin6_p); 902 inp->inp_vflag |= INP_IPV4; 903 inp->inp_vflag &= ~INP_IPV6; 904 error = in_pcbbind(inp, (struct sockaddr *)&sin, 905 td->td_ucred); 906 goto out; 907 } 908 #endif 909 } 910 911 error = in6_pcbbind(inp, nam, td->td_ucred); 912 #ifdef INET 913 out: 914 #endif 915 INP_HASH_WUNLOCK(&V_udbinfo); 916 INP_WUNLOCK(inp); 917 return (error); 918 } 919 920 static void 921 udp6_close(struct socket *so) 922 { 923 struct inpcb *inp; 924 925 inp = sotoinpcb(so); 926 KASSERT(inp != NULL, ("udp6_close: inp == NULL")); 927 928 #ifdef INET 929 if (inp->inp_vflag & INP_IPV4) { 930 struct pr_usrreqs *pru; 931 932 pru = inetsw[ip_protox[IPPROTO_UDP]].pr_usrreqs; 933 (*pru->pru_disconnect)(so); 934 return; 935 } 936 #endif 937 INP_WLOCK(inp); 938 if (!IN6_IS_ADDR_UNSPECIFIED(&inp->in6p_faddr)) { 939 INP_HASH_WLOCK(&V_udbinfo); 940 in6_pcbdisconnect(inp); 941 inp->in6p_laddr = in6addr_any; 942 INP_HASH_WUNLOCK(&V_udbinfo); 943 soisdisconnected(so); 944 } 945 INP_WUNLOCK(inp); 946 } 947 948 static int 949 udp6_connect(struct socket *so, struct sockaddr *nam, struct thread *td) 950 { 951 struct inpcb *inp; 952 struct sockaddr_in6 *sin6; 953 int error; 954 955 inp = sotoinpcb(so); 956 sin6 = (struct sockaddr_in6 *)nam; 957 KASSERT(inp != NULL, ("udp6_connect: inp == NULL")); 958 959 /* 960 * XXXRW: Need to clarify locking of v4/v6 flags. 961 */ 962 INP_WLOCK(inp); 963 #ifdef INET 964 if (IN6_IS_ADDR_V4MAPPED(&sin6->sin6_addr)) { 965 struct sockaddr_in sin; 966 967 if ((inp->inp_flags & IN6P_IPV6_V6ONLY) != 0) { 968 error = EINVAL; 969 goto out; 970 } 971 if (inp->inp_faddr.s_addr != INADDR_ANY) { 972 error = EISCONN; 973 goto out; 974 } 975 in6_sin6_2_sin(&sin, sin6); 976 inp->inp_vflag |= INP_IPV4; 977 inp->inp_vflag &= ~INP_IPV6; 978 error = prison_remote_ip4(td->td_ucred, &sin.sin_addr); 979 if (error != 0) 980 goto out; 981 INP_HASH_WLOCK(&V_udbinfo); 982 error = in_pcbconnect(inp, (struct sockaddr *)&sin, 983 td->td_ucred); 984 INP_HASH_WUNLOCK(&V_udbinfo); 985 if (error == 0) 986 soisconnected(so); 987 goto out; 988 } 989 #endif 990 if (!IN6_IS_ADDR_UNSPECIFIED(&inp->in6p_faddr)) { 991 error = EISCONN; 992 goto out; 993 } 994 inp->inp_vflag &= ~INP_IPV4; 995 inp->inp_vflag |= INP_IPV6; 996 error = prison_remote_ip6(td->td_ucred, &sin6->sin6_addr); 997 if (error != 0) 998 goto out; 999 INP_HASH_WLOCK(&V_udbinfo); 1000 error = in6_pcbconnect(inp, nam, td->td_ucred); 1001 INP_HASH_WUNLOCK(&V_udbinfo); 1002 if (error == 0) 1003 soisconnected(so); 1004 out: 1005 INP_WUNLOCK(inp); 1006 return (error); 1007 } 1008 1009 static void 1010 udp6_detach(struct socket *so) 1011 { 1012 struct inpcb *inp; 1013 struct udpcb *up; 1014 1015 inp = sotoinpcb(so); 1016 KASSERT(inp != NULL, ("udp6_detach: inp == NULL")); 1017 1018 INP_INFO_WLOCK(&V_udbinfo); 1019 INP_WLOCK(inp); 1020 up = intoudpcb(inp); 1021 KASSERT(up != NULL, ("%s: up == NULL", __func__)); 1022 in_pcbdetach(inp); 1023 in_pcbfree(inp); 1024 INP_INFO_WUNLOCK(&V_udbinfo); 1025 udp_discardcb(up); 1026 } 1027 1028 static int 1029 udp6_disconnect(struct socket *so) 1030 { 1031 struct inpcb *inp; 1032 int error; 1033 1034 inp = sotoinpcb(so); 1035 KASSERT(inp != NULL, ("udp6_disconnect: inp == NULL")); 1036 1037 #ifdef INET 1038 if (inp->inp_vflag & INP_IPV4) { 1039 struct pr_usrreqs *pru; 1040 1041 pru = inetsw[ip_protox[IPPROTO_UDP]].pr_usrreqs; 1042 (void)(*pru->pru_disconnect)(so); 1043 return (0); 1044 } 1045 #endif 1046 1047 INP_WLOCK(inp); 1048 1049 if (IN6_IS_ADDR_UNSPECIFIED(&inp->in6p_faddr)) { 1050 error = ENOTCONN; 1051 goto out; 1052 } 1053 1054 INP_HASH_WLOCK(&V_udbinfo); 1055 in6_pcbdisconnect(inp); 1056 inp->in6p_laddr = in6addr_any; 1057 INP_HASH_WUNLOCK(&V_udbinfo); 1058 SOCK_LOCK(so); 1059 so->so_state &= ~SS_ISCONNECTED; /* XXX */ 1060 SOCK_UNLOCK(so); 1061 out: 1062 INP_WUNLOCK(inp); 1063 return (0); 1064 } 1065 1066 static int 1067 udp6_send(struct socket *so, int flags, struct mbuf *m, 1068 struct sockaddr *addr, struct mbuf *control, struct thread *td) 1069 { 1070 struct inpcb *inp; 1071 int error = 0; 1072 1073 inp = sotoinpcb(so); 1074 KASSERT(inp != NULL, ("udp6_send: inp == NULL")); 1075 1076 INP_WLOCK(inp); 1077 if (addr) { 1078 if (addr->sa_len != sizeof(struct sockaddr_in6)) { 1079 error = EINVAL; 1080 goto bad; 1081 } 1082 if (addr->sa_family != AF_INET6) { 1083 error = EAFNOSUPPORT; 1084 goto bad; 1085 } 1086 } 1087 1088 #ifdef INET 1089 if ((inp->inp_flags & IN6P_IPV6_V6ONLY) == 0) { 1090 int hasv4addr; 1091 struct sockaddr_in6 *sin6 = 0; 1092 1093 if (addr == 0) 1094 hasv4addr = (inp->inp_vflag & INP_IPV4); 1095 else { 1096 sin6 = (struct sockaddr_in6 *)addr; 1097 hasv4addr = IN6_IS_ADDR_V4MAPPED(&sin6->sin6_addr) 1098 ? 1 : 0; 1099 } 1100 if (hasv4addr) { 1101 struct pr_usrreqs *pru; 1102 1103 /* 1104 * XXXRW: We release UDP-layer locks before calling 1105 * udp_send() in order to avoid recursion. However, 1106 * this does mean there is a short window where inp's 1107 * fields are unstable. Could this lead to a 1108 * potential race in which the factors causing us to 1109 * select the UDPv4 output routine are invalidated? 1110 */ 1111 INP_WUNLOCK(inp); 1112 if (sin6) 1113 in6_sin6_2_sin_in_sock(addr); 1114 pru = inetsw[ip_protox[IPPROTO_UDP]].pr_usrreqs; 1115 /* addr will just be freed in sendit(). */ 1116 return ((*pru->pru_send)(so, flags, m, addr, control, 1117 td)); 1118 } 1119 } 1120 #endif 1121 #ifdef MAC 1122 mac_inpcb_create_mbuf(inp, m); 1123 #endif 1124 INP_HASH_WLOCK(&V_udbinfo); 1125 error = udp6_output(inp, m, addr, control, td); 1126 INP_HASH_WUNLOCK(&V_udbinfo); 1127 #ifdef INET 1128 #endif 1129 INP_WUNLOCK(inp); 1130 return (error); 1131 1132 bad: 1133 INP_WUNLOCK(inp); 1134 m_freem(m); 1135 return (error); 1136 } 1137 1138 struct pr_usrreqs udp6_usrreqs = { 1139 .pru_abort = udp6_abort, 1140 .pru_attach = udp6_attach, 1141 .pru_bind = udp6_bind, 1142 .pru_connect = udp6_connect, 1143 .pru_control = in6_control, 1144 .pru_detach = udp6_detach, 1145 .pru_disconnect = udp6_disconnect, 1146 .pru_peeraddr = in6_mapped_peeraddr, 1147 .pru_send = udp6_send, 1148 .pru_shutdown = udp_shutdown, 1149 .pru_sockaddr = in6_mapped_sockaddr, 1150 .pru_soreceive = soreceive_dgram, 1151 .pru_sosend = sosend_dgram, 1152 .pru_sosetlabel = in_pcbsosetlabel, 1153 .pru_close = udp6_close 1154 }; 1155