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