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 128extern struct protosw inetsw[]; 129static void udp6_detach(struct socket *so); 130 131static void 132udp6_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 IPSEC6STAT_INC(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 173int 174udp6_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 struct m_tag *fwd_tag; 186 uint16_t uh_sum; 187 188 ifp = m->m_pkthdr.rcvif; 189 ip6 = mtod(m, struct ip6_hdr *); 190 191 if (faithprefix_p != NULL && (*faithprefix_p)(&ip6->ip6_dst)) { 192 /* XXX send icmp6 host/port unreach? */ 193 m_freem(m); 194 return (IPPROTO_DONE); 195 } 196 197#ifndef PULLDOWN_TEST 198 IP6_EXTHDR_CHECK(m, off, sizeof(struct udphdr), IPPROTO_DONE); 199 ip6 = mtod(m, struct ip6_hdr *); 200 uh = (struct udphdr *)((caddr_t)ip6 + off); 201#else 202 IP6_EXTHDR_GET(uh, struct udphdr *, m, off, sizeof(*uh)); 203 if (!uh) 204 return (IPPROTO_DONE); 205#endif 206 207 UDPSTAT_INC(udps_ipackets); 208 209 /* 210 * Destination port of 0 is illegal, based on RFC768. 211 */ 212 if (uh->uh_dport == 0) 213 goto badunlocked; 214 215 plen = ntohs(ip6->ip6_plen) - off + sizeof(*ip6); 216 ulen = ntohs((u_short)uh->uh_ulen); 217 218 if (plen != ulen) { 219 UDPSTAT_INC(udps_badlen); 220 goto badunlocked; 221 } 222 223 /* 224 * Checksum extended UDP header and data. 225 */ 226 if (uh->uh_sum == 0) { 227 UDPSTAT_INC(udps_nosum); 228 goto badunlocked; 229 } 230 231 if (m->m_pkthdr.csum_flags & CSUM_DATA_VALID_IPV6) { 232 if (m->m_pkthdr.csum_flags & CSUM_PSEUDO_HDR) 233 uh_sum = m->m_pkthdr.csum_data; 234 else 235 uh_sum = in6_cksum_pseudo(ip6, ulen, 236 IPPROTO_UDP, m->m_pkthdr.csum_data); 237 uh_sum ^= 0xffff; 238 } else 239 uh_sum = in6_cksum(m, IPPROTO_UDP, off, ulen); 240 241 if (uh_sum != 0) { 242 UDPSTAT_INC(udps_badsum); 243 goto badunlocked; 244 } 245 246 /* 247 * Construct sockaddr format source address. 248 */ 249 init_sin6(&fromsa, m); 250 fromsa.sin6_port = uh->uh_sport; 251 252 if (IN6_IS_ADDR_MULTICAST(&ip6->ip6_dst)) { 253 struct inpcb *last; 254 struct ip6_moptions *imo; 255 256 INP_INFO_RLOCK(&V_udbinfo); 257 /* 258 * In the event that laddr should be set to the link-local 259 * address (this happens in RIPng), the multicast address 260 * specified in the received packet will not match laddr. To 261 * handle this situation, matching is relaxed if the 262 * receiving interface is the same as one specified in the 263 * socket and if the destination multicast address matches 264 * one of the multicast groups specified in the socket. 265 */ 266 267 /* 268 * KAME note: traditionally we dropped udpiphdr from mbuf 269 * here. We need udphdr for IPsec processing so we do that 270 * later. 271 */ 272 last = NULL; 273 LIST_FOREACH(inp, &V_udb, inp_list) { 274 if ((inp->inp_vflag & INP_IPV6) == 0) 275 continue; 276 if (inp->inp_lport != uh->uh_dport) 277 continue; 278 if (inp->inp_fport != 0 && 279 inp->inp_fport != uh->uh_sport) 280 continue; 281 if (!IN6_IS_ADDR_UNSPECIFIED(&inp->in6p_laddr)) { 282 if (!IN6_ARE_ADDR_EQUAL(&inp->in6p_laddr, 283 &ip6->ip6_dst)) 284 continue; 285 } 286 if (!IN6_IS_ADDR_UNSPECIFIED(&inp->in6p_faddr)) { 287 if (!IN6_ARE_ADDR_EQUAL(&inp->in6p_faddr, 288 &ip6->ip6_src) || 289 inp->inp_fport != uh->uh_sport) 290 continue; 291 } 292 293 /* 294 * XXXRW: Because we weren't holding either the inpcb 295 * or the hash lock when we checked for a match 296 * before, we should probably recheck now that the 297 * inpcb lock is (supposed to be) held. 298 */ 299 300 /* 301 * Handle socket delivery policy for any-source 302 * and source-specific multicast. [RFC3678] 303 */ 304 imo = inp->in6p_moptions; 305 if (imo && IN6_IS_ADDR_MULTICAST(&ip6->ip6_dst)) { 306 struct sockaddr_in6 mcaddr; 307 int blocked; 308 309 INP_RLOCK(inp); 310 311 bzero(&mcaddr, sizeof(struct sockaddr_in6)); 312 mcaddr.sin6_len = sizeof(struct sockaddr_in6); 313 mcaddr.sin6_family = AF_INET6; 314 mcaddr.sin6_addr = ip6->ip6_dst; 315 316 blocked = im6o_mc_filter(imo, ifp, 317 (struct sockaddr *)&mcaddr, 318 (struct sockaddr *)&fromsa); 319 if (blocked != MCAST_PASS) { 320 if (blocked == MCAST_NOTGMEMBER) 321 IP6STAT_INC(ip6s_notmember); 322 if (blocked == MCAST_NOTSMEMBER || 323 blocked == MCAST_MUTED) 324 UDPSTAT_INC(udps_filtermcast); 325 INP_RUNLOCK(inp); /* XXX */ 326 continue; 327 } 328 329 INP_RUNLOCK(inp); 330 } 331 if (last != NULL) { 332 struct mbuf *n; 333 334 if ((n = m_copy(m, 0, M_COPYALL)) != NULL) { 335 INP_RLOCK(last); 336 up = intoudpcb(last); 337 if (up->u_tun_func == NULL) { 338 udp6_append(last, n, off, &fromsa); 339 } else { 340 /* 341 * Engage the tunneling 342 * protocol we will have to 343 * leave the info_lock up, 344 * since we are hunting 345 * through multiple UDP's. 346 * 347 */ 348 (*up->u_tun_func)(n, off, last); 349 } 350 INP_RUNLOCK(last); 351 } 352 } 353 last = inp; 354 /* 355 * Don't look for additional matches if this one does 356 * not have either the SO_REUSEPORT or SO_REUSEADDR 357 * socket options set. This heuristic avoids 358 * searching through all pcbs in the common case of a 359 * non-shared port. It assumes that an application 360 * will never clear these options after setting them. 361 */ 362 if ((last->inp_socket->so_options & 363 (SO_REUSEPORT|SO_REUSEADDR)) == 0) 364 break; 365 } 366 367 if (last == NULL) { 368 /* 369 * No matching pcb found; discard datagram. (No need 370 * to send an ICMP Port Unreachable for a broadcast 371 * or multicast datgram.) 372 */ 373 UDPSTAT_INC(udps_noport); 374 UDPSTAT_INC(udps_noportmcast); 375 goto badheadlocked; 376 } 377 INP_RLOCK(last); 378 INP_INFO_RUNLOCK(&V_udbinfo); 379 up = intoudpcb(last); 380 if (up->u_tun_func == NULL) { 381 udp6_append(last, m, off, &fromsa); 382 } else { 383 /* 384 * Engage the tunneling protocol. 385 */ 386 (*up->u_tun_func)(m, off, last); 387 } 388 INP_RUNLOCK(last); 389 return (IPPROTO_DONE); 390 } 391 /* 392 * Locate pcb for datagram. 393 */ 394 395 /* 396 * Grab info from PACKET_TAG_IPFORWARD tag prepended to the chain. 397 */ 398 if ((m->m_flags & M_IP6_NEXTHOP) && 399 (fwd_tag = m_tag_find(m, PACKET_TAG_IPFORWARD, NULL)) != NULL) { 400 struct sockaddr_in6 *next_hop6; 401 402 next_hop6 = (struct sockaddr_in6 *)(fwd_tag + 1); 403 404 /* 405 * Transparently forwarded. Pretend to be the destination. 406 * Already got one like this? 407 */ 408 inp = in6_pcblookup_mbuf(&V_udbinfo, 409 &ip6->ip6_src, uh->uh_sport, &ip6->ip6_dst, uh->uh_dport, 410 INPLOOKUP_RLOCKPCB, m->m_pkthdr.rcvif, m); 411 if (!inp) { 412 /* 413 * It's new. Try to find the ambushing socket. 414 * Because we've rewritten the destination address, 415 * any hardware-generated hash is ignored. 416 */ 417 inp = in6_pcblookup(&V_udbinfo, &ip6->ip6_src, 418 uh->uh_sport, &next_hop6->sin6_addr, 419 next_hop6->sin6_port ? htons(next_hop6->sin6_port) : 420 uh->uh_dport, INPLOOKUP_WILDCARD | 421 INPLOOKUP_RLOCKPCB, m->m_pkthdr.rcvif); 422 } 423 /* Remove the tag from the packet. We don't need it anymore. */ 424 m_tag_delete(m, fwd_tag); 425 m->m_flags &= ~M_IP6_NEXTHOP; 426 } else 427 inp = in6_pcblookup_mbuf(&V_udbinfo, &ip6->ip6_src, 428 uh->uh_sport, &ip6->ip6_dst, uh->uh_dport, 429 INPLOOKUP_WILDCARD | INPLOOKUP_RLOCKPCB, 430 m->m_pkthdr.rcvif, m); 431 if (inp == NULL) { 432 if (udp_log_in_vain) { 433 char ip6bufs[INET6_ADDRSTRLEN]; 434 char ip6bufd[INET6_ADDRSTRLEN]; 435 436 log(LOG_INFO, 437 "Connection attempt to UDP [%s]:%d from [%s]:%d\n", 438 ip6_sprintf(ip6bufd, &ip6->ip6_dst), 439 ntohs(uh->uh_dport), 440 ip6_sprintf(ip6bufs, &ip6->ip6_src), 441 ntohs(uh->uh_sport)); 442 } 443 UDPSTAT_INC(udps_noport); 444 if (m->m_flags & M_MCAST) { 445 printf("UDP6: M_MCAST is set in a unicast packet.\n"); 446 UDPSTAT_INC(udps_noportmcast); 447 goto badunlocked; 448 } 449 if (V_udp_blackhole) 450 goto badunlocked; 451 if (badport_bandlim(BANDLIM_ICMP6_UNREACH) < 0) 452 goto badunlocked; 453 icmp6_error(m, ICMP6_DST_UNREACH, ICMP6_DST_UNREACH_NOPORT, 0); 454 return (IPPROTO_DONE); 455 } 456 INP_RLOCK_ASSERT(inp); 457 up = intoudpcb(inp); 458 if (up->u_tun_func == NULL) { 459 udp6_append(inp, m, off, &fromsa); 460 } else { 461 /* 462 * Engage the tunneling protocol. 463 */ 464 465 (*up->u_tun_func)(m, off, inp); 466 } 467 INP_RUNLOCK(inp); 468 return (IPPROTO_DONE); 469 470badheadlocked: 471 INP_INFO_RUNLOCK(&V_udbinfo); 472badunlocked: 473 if (m) 474 m_freem(m); 475 return (IPPROTO_DONE); 476} 477 478void 479udp6_ctlinput(int cmd, struct sockaddr *sa, void *d) 480{ 481 struct udphdr uh; 482 struct ip6_hdr *ip6; 483 struct mbuf *m; 484 int off = 0; 485 struct ip6ctlparam *ip6cp = NULL; 486 const struct sockaddr_in6 *sa6_src = NULL; 487 void *cmdarg; 488 struct inpcb *(*notify)(struct inpcb *, int) = udp_notify; 489 struct udp_portonly { 490 u_int16_t uh_sport; 491 u_int16_t uh_dport; 492 } *uhp; 493 494 if (sa->sa_family != AF_INET6 || 495 sa->sa_len != sizeof(struct sockaddr_in6)) 496 return; 497 498 if ((unsigned)cmd >= PRC_NCMDS) 499 return; 500 if (PRC_IS_REDIRECT(cmd)) 501 notify = in6_rtchange, d = NULL; 502 else if (cmd == PRC_HOSTDEAD) 503 d = NULL; 504 else if (inet6ctlerrmap[cmd] == 0) 505 return; 506 507 /* if the parameter is from icmp6, decode it. */ 508 if (d != NULL) { 509 ip6cp = (struct ip6ctlparam *)d; 510 m = ip6cp->ip6c_m; 511 ip6 = ip6cp->ip6c_ip6; 512 off = ip6cp->ip6c_off; 513 cmdarg = ip6cp->ip6c_cmdarg; 514 sa6_src = ip6cp->ip6c_src; 515 } else { 516 m = NULL; 517 ip6 = NULL; 518 cmdarg = NULL; 519 sa6_src = &sa6_any; 520 } 521 522 if (ip6) { 523 /* 524 * XXX: We assume that when IPV6 is non NULL, 525 * M and OFF are valid. 526 */ 527 528 /* Check if we can safely examine src and dst ports. */ 529 if (m->m_pkthdr.len < off + sizeof(*uhp)) 530 return; 531 532 bzero(&uh, sizeof(uh)); 533 m_copydata(m, off, sizeof(*uhp), (caddr_t)&uh); 534 535 (void) in6_pcbnotify(&V_udbinfo, sa, uh.uh_dport, 536 (struct sockaddr *)ip6cp->ip6c_src, uh.uh_sport, cmd, 537 cmdarg, notify); 538 } else 539 (void) in6_pcbnotify(&V_udbinfo, sa, 0, 540 (const struct sockaddr *)sa6_src, 0, cmd, cmdarg, notify); 541} 542 543static int 544udp6_getcred(SYSCTL_HANDLER_ARGS) 545{ 546 struct xucred xuc; 547 struct sockaddr_in6 addrs[2]; 548 struct inpcb *inp; 549 int error; 550 551 error = priv_check(req->td, PRIV_NETINET_GETCRED); 552 if (error) 553 return (error); 554 555 if (req->newlen != sizeof(addrs)) 556 return (EINVAL); 557 if (req->oldlen != sizeof(struct xucred)) 558 return (EINVAL); 559 error = SYSCTL_IN(req, addrs, sizeof(addrs)); 560 if (error) 561 return (error); 562 if ((error = sa6_embedscope(&addrs[0], V_ip6_use_defzone)) != 0 || 563 (error = sa6_embedscope(&addrs[1], V_ip6_use_defzone)) != 0) { 564 return (error); 565 } 566 inp = in6_pcblookup(&V_udbinfo, &addrs[1].sin6_addr, 567 addrs[1].sin6_port, &addrs[0].sin6_addr, addrs[0].sin6_port, 568 INPLOOKUP_WILDCARD | INPLOOKUP_RLOCKPCB, NULL); 569 if (inp != NULL) { 570 INP_RLOCK_ASSERT(inp); 571 if (inp->inp_socket == NULL) 572 error = ENOENT; 573 if (error == 0) 574 error = cr_canseesocket(req->td->td_ucred, 575 inp->inp_socket); 576 if (error == 0) 577 cru2x(inp->inp_cred, &xuc); 578 INP_RUNLOCK(inp); 579 } else 580 error = ENOENT; 581 if (error == 0) 582 error = SYSCTL_OUT(req, &xuc, sizeof(struct xucred)); 583 return (error); 584} 585 586SYSCTL_PROC(_net_inet6_udp6, OID_AUTO, getcred, CTLTYPE_OPAQUE|CTLFLAG_RW, 0, 587 0, udp6_getcred, "S,xucred", "Get the xucred of a UDP6 connection"); 588 589static int 590udp6_output(struct inpcb *inp, struct mbuf *m, struct sockaddr *addr6, 591 struct mbuf *control, struct thread *td) 592{ 593 u_int32_t ulen = m->m_pkthdr.len; 594 u_int32_t plen = sizeof(struct udphdr) + ulen; 595 struct ip6_hdr *ip6; 596 struct udphdr *udp6; 597 struct in6_addr *laddr, *faddr, in6a; 598 struct sockaddr_in6 *sin6 = NULL; 599 struct ifnet *oifp = NULL; 600 int scope_ambiguous = 0; 601 u_short fport; 602 int error = 0; 603 struct ip6_pktopts *optp, opt; 604 int af = AF_INET6, hlen = sizeof(struct ip6_hdr); 605 int flags; 606 struct sockaddr_in6 tmp; 607 608 INP_WLOCK_ASSERT(inp); 609 INP_HASH_WLOCK_ASSERT(inp->inp_pcbinfo); 610 611 if (addr6) { 612 /* addr6 has been validated in udp6_send(). */ 613 sin6 = (struct sockaddr_in6 *)addr6; 614 615 /* protect *sin6 from overwrites */ 616 tmp = *sin6; 617 sin6 = &tmp; 618 619 /* 620 * Application should provide a proper zone ID or the use of 621 * default zone IDs should be enabled. Unfortunately, some 622 * applications do not behave as it should, so we need a 623 * workaround. Even if an appropriate ID is not determined, 624 * we'll see if we can determine the outgoing interface. If we 625 * can, determine the zone ID based on the interface below. 626 */ 627 if (sin6->sin6_scope_id == 0 && !V_ip6_use_defzone) 628 scope_ambiguous = 1; 629 if ((error = sa6_embedscope(sin6, V_ip6_use_defzone)) != 0) 630 return (error); 631 } 632 633 if (control) { 634 if ((error = ip6_setpktopts(control, &opt, 635 inp->in6p_outputopts, td->td_ucred, IPPROTO_UDP)) != 0) 636 goto release; 637 optp = &opt; 638 } else 639 optp = inp->in6p_outputopts; 640 641 if (sin6) { 642 faddr = &sin6->sin6_addr; 643 644 /* 645 * IPv4 version of udp_output calls in_pcbconnect in this case, 646 * which needs splnet and affects performance. 647 * Since we saw no essential reason for calling in_pcbconnect, 648 * we get rid of such kind of logic, and call in6_selectsrc 649 * and in6_pcbsetport in order to fill in the local address 650 * and the local port. 651 */ 652 if (sin6->sin6_port == 0) { 653 error = EADDRNOTAVAIL; 654 goto release; 655 } 656 657 if (!IN6_IS_ADDR_UNSPECIFIED(&inp->in6p_faddr)) { 658 /* how about ::ffff:0.0.0.0 case? */ 659 error = EISCONN; 660 goto release; 661 } 662 663 fport = sin6->sin6_port; /* allow 0 port */ 664 665 if (IN6_IS_ADDR_V4MAPPED(faddr)) { 666 if ((inp->inp_flags & IN6P_IPV6_V6ONLY)) { 667 /* 668 * I believe we should explicitly discard the 669 * packet when mapped addresses are disabled, 670 * rather than send the packet as an IPv6 one. 671 * If we chose the latter approach, the packet 672 * might be sent out on the wire based on the 673 * default route, the situation which we'd 674 * probably want to avoid. 675 * (20010421 jinmei@kame.net) 676 */ 677 error = EINVAL; 678 goto release; 679 } 680 if (!IN6_IS_ADDR_UNSPECIFIED(&inp->in6p_laddr) && 681 !IN6_IS_ADDR_V4MAPPED(&inp->in6p_laddr)) { 682 /* 683 * when remote addr is an IPv4-mapped address, 684 * local addr should not be an IPv6 address, 685 * since you cannot determine how to map IPv6 686 * source address to IPv4. 687 */ 688 error = EINVAL; 689 goto release; 690 } 691 692 af = AF_INET; 693 } 694 695 if (!IN6_IS_ADDR_V4MAPPED(faddr)) { 696 error = in6_selectsrc(sin6, optp, inp, NULL, 697 td->td_ucred, &oifp, &in6a); 698 if (error) 699 goto release; 700 if (oifp && scope_ambiguous && 701 (error = in6_setscope(&sin6->sin6_addr, 702 oifp, NULL))) { 703 goto release; 704 } 705 laddr = &in6a; 706 } else 707 laddr = &inp->in6p_laddr; /* XXX */ 708 if (laddr == NULL) { 709 if (error == 0) 710 error = EADDRNOTAVAIL; 711 goto release; 712 } 713 if (inp->inp_lport == 0 && 714 (error = in6_pcbsetport(laddr, inp, td->td_ucred)) != 0) { 715 /* Undo an address bind that may have occurred. */ 716 inp->in6p_laddr = in6addr_any; 717 goto release; 718 } 719 } else { 720 if (IN6_IS_ADDR_UNSPECIFIED(&inp->in6p_faddr)) { 721 error = ENOTCONN; 722 goto release; 723 } 724 if (IN6_IS_ADDR_V4MAPPED(&inp->in6p_faddr)) { 725 if ((inp->inp_flags & IN6P_IPV6_V6ONLY)) { 726 /* 727 * XXX: this case would happen when the 728 * application sets the V6ONLY flag after 729 * connecting the foreign address. 730 * Such applications should be fixed, 731 * so we bark here. 732 */ 733 log(LOG_INFO, "udp6_output: IPV6_V6ONLY " 734 "option was set for a connected socket\n"); 735 error = EINVAL; 736 goto release; 737 } else 738 af = AF_INET; 739 } 740 laddr = &inp->in6p_laddr; 741 faddr = &inp->in6p_faddr; 742 fport = inp->inp_fport; 743 } 744 745 if (af == AF_INET) 746 hlen = sizeof(struct ip); 747 748 /* 749 * Calculate data length and get a mbuf 750 * for UDP and IP6 headers. 751 */ 752 M_PREPEND(m, hlen + sizeof(struct udphdr), M_DONTWAIT); 753 if (m == 0) { 754 error = ENOBUFS; 755 goto release; 756 } 757 758 /* 759 * Stuff checksum and output datagram. 760 */ 761 udp6 = (struct udphdr *)(mtod(m, caddr_t) + hlen); 762 udp6->uh_sport = inp->inp_lport; /* lport is always set in the PCB */ 763 udp6->uh_dport = fport; 764 if (plen <= 0xffff) 765 udp6->uh_ulen = htons((u_short)plen); 766 else 767 udp6->uh_ulen = 0; 768 udp6->uh_sum = 0; 769 770 switch (af) { 771 case AF_INET6: 772 ip6 = mtod(m, struct ip6_hdr *); 773 ip6->ip6_flow = inp->inp_flow & IPV6_FLOWINFO_MASK; 774 ip6->ip6_vfc &= ~IPV6_VERSION_MASK; 775 ip6->ip6_vfc |= IPV6_VERSION; 776#if 0 /* ip6_plen will be filled in ip6_output. */ 777 ip6->ip6_plen = htons((u_short)plen); 778#endif 779 ip6->ip6_nxt = IPPROTO_UDP; 780 ip6->ip6_hlim = in6_selecthlim(inp, NULL); 781 ip6->ip6_src = *laddr; 782 ip6->ip6_dst = *faddr; 783 784 udp6->uh_sum = in6_cksum_pseudo(ip6, plen, IPPROTO_UDP, 0); 785 m->m_pkthdr.csum_flags = CSUM_UDP_IPV6; 786 m->m_pkthdr.csum_data = offsetof(struct udphdr, uh_sum); 787 788 flags = 0; 789 790 UDPSTAT_INC(udps_opackets); 791 error = ip6_output(m, optp, NULL, flags, inp->in6p_moptions, 792 NULL, inp); 793 break; 794 case AF_INET: 795 error = EAFNOSUPPORT; 796 goto release; 797 } 798 goto releaseopt; 799 800release: 801 m_freem(m); 802 803releaseopt: 804 if (control) { 805 ip6_clearpktopts(&opt, -1); 806 m_freem(control); 807 } 808 return (error); 809} 810 811static void 812udp6_abort(struct socket *so) 813{ 814 struct inpcb *inp; 815 816 inp = sotoinpcb(so); 817 KASSERT(inp != NULL, ("udp6_abort: inp == NULL")); 818 819#ifdef INET 820 if (inp->inp_vflag & INP_IPV4) { 821 struct pr_usrreqs *pru; 822 823 pru = inetsw[ip_protox[IPPROTO_UDP]].pr_usrreqs; 824 (*pru->pru_abort)(so); 825 return; 826 } 827#endif 828 829 INP_WLOCK(inp); 830 if (!IN6_IS_ADDR_UNSPECIFIED(&inp->in6p_faddr)) { 831 INP_HASH_WLOCK(&V_udbinfo); 832 in6_pcbdisconnect(inp); 833 inp->in6p_laddr = in6addr_any; 834 INP_HASH_WUNLOCK(&V_udbinfo); 835 soisdisconnected(so); 836 } 837 INP_WUNLOCK(inp); 838} 839 840static int 841udp6_attach(struct socket *so, int proto, struct thread *td) 842{ 843 struct inpcb *inp; 844 int error; 845 846 inp = sotoinpcb(so); 847 KASSERT(inp == NULL, ("udp6_attach: inp != NULL")); 848 849 if (so->so_snd.sb_hiwat == 0 || so->so_rcv.sb_hiwat == 0) { 850 error = soreserve(so, udp_sendspace, udp_recvspace); 851 if (error) 852 return (error); 853 } 854 INP_INFO_WLOCK(&V_udbinfo); 855 error = in_pcballoc(so, &V_udbinfo); 856 if (error) { 857 INP_INFO_WUNLOCK(&V_udbinfo); 858 return (error); 859 } 860 inp = (struct inpcb *)so->so_pcb; 861 inp->inp_vflag |= INP_IPV6; 862 if ((inp->inp_flags & IN6P_IPV6_V6ONLY) == 0) 863 inp->inp_vflag |= INP_IPV4; 864 inp->in6p_hops = -1; /* use kernel default */ 865 inp->in6p_cksum = -1; /* just to be sure */ 866 /* 867 * XXX: ugly!! 868 * IPv4 TTL initialization is necessary for an IPv6 socket as well, 869 * because the socket may be bound to an IPv6 wildcard address, 870 * which may match an IPv4-mapped IPv6 address. 871 */ 872 inp->inp_ip_ttl = V_ip_defttl; 873 874 error = udp_newudpcb(inp); 875 if (error) { 876 in_pcbdetach(inp); 877 in_pcbfree(inp); 878 INP_INFO_WUNLOCK(&V_udbinfo); 879 return (error); 880 } 881 INP_WUNLOCK(inp); 882 INP_INFO_WUNLOCK(&V_udbinfo); 883 return (0); 884} 885 886static int 887udp6_bind(struct socket *so, struct sockaddr *nam, struct thread *td) 888{ 889 struct inpcb *inp; 890 int error; 891 892 inp = sotoinpcb(so); 893 KASSERT(inp != NULL, ("udp6_bind: inp == NULL")); 894 895 INP_WLOCK(inp); 896 INP_HASH_WLOCK(&V_udbinfo); 897 inp->inp_vflag &= ~INP_IPV4; 898 inp->inp_vflag |= INP_IPV6; 899 if ((inp->inp_flags & IN6P_IPV6_V6ONLY) == 0) { 900 struct sockaddr_in6 *sin6_p; 901 902 sin6_p = (struct sockaddr_in6 *)nam; 903 904 if (IN6_IS_ADDR_UNSPECIFIED(&sin6_p->sin6_addr)) 905 inp->inp_vflag |= INP_IPV4; 906#ifdef INET 907 else if (IN6_IS_ADDR_V4MAPPED(&sin6_p->sin6_addr)) { 908 struct sockaddr_in sin; 909 910 in6_sin6_2_sin(&sin, sin6_p); 911 inp->inp_vflag |= INP_IPV4; 912 inp->inp_vflag &= ~INP_IPV6; 913 error = in_pcbbind(inp, (struct sockaddr *)&sin, 914 td->td_ucred); 915 goto out; 916 } 917#endif 918 } 919 920 error = in6_pcbbind(inp, nam, td->td_ucred); 921#ifdef INET 922out: 923#endif 924 INP_HASH_WUNLOCK(&V_udbinfo); 925 INP_WUNLOCK(inp); 926 return (error); 927} 928 929static void 930udp6_close(struct socket *so) 931{ 932 struct inpcb *inp; 933 934 inp = sotoinpcb(so); 935 KASSERT(inp != NULL, ("udp6_close: inp == NULL")); 936 937#ifdef INET 938 if (inp->inp_vflag & INP_IPV4) { 939 struct pr_usrreqs *pru; 940 941 pru = inetsw[ip_protox[IPPROTO_UDP]].pr_usrreqs; 942 (*pru->pru_disconnect)(so); 943 return; 944 } 945#endif 946 INP_WLOCK(inp); 947 if (!IN6_IS_ADDR_UNSPECIFIED(&inp->in6p_faddr)) { 948 INP_HASH_WLOCK(&V_udbinfo); 949 in6_pcbdisconnect(inp); 950 inp->in6p_laddr = in6addr_any; 951 INP_HASH_WUNLOCK(&V_udbinfo); 952 soisdisconnected(so); 953 } 954 INP_WUNLOCK(inp); 955} 956 957static int 958udp6_connect(struct socket *so, struct sockaddr *nam, struct thread *td) 959{ 960 struct inpcb *inp; 961 struct sockaddr_in6 *sin6; 962 int error; 963 964 inp = sotoinpcb(so); 965 sin6 = (struct sockaddr_in6 *)nam; 966 KASSERT(inp != NULL, ("udp6_connect: inp == NULL")); 967 968 /* 969 * XXXRW: Need to clarify locking of v4/v6 flags. 970 */ 971 INP_WLOCK(inp); 972#ifdef INET 973 if (IN6_IS_ADDR_V4MAPPED(&sin6->sin6_addr)) { 974 struct sockaddr_in sin; 975 976 if ((inp->inp_flags & IN6P_IPV6_V6ONLY) != 0) { 977 error = EINVAL; 978 goto out; 979 } 980 if (inp->inp_faddr.s_addr != INADDR_ANY) { 981 error = EISCONN; 982 goto out; 983 } 984 in6_sin6_2_sin(&sin, sin6); 985 inp->inp_vflag |= INP_IPV4; 986 inp->inp_vflag &= ~INP_IPV6; 987 error = prison_remote_ip4(td->td_ucred, &sin.sin_addr); 988 if (error != 0) 989 goto out; 990 INP_HASH_WLOCK(&V_udbinfo); 991 error = in_pcbconnect(inp, (struct sockaddr *)&sin, 992 td->td_ucred); 993 INP_HASH_WUNLOCK(&V_udbinfo); 994 if (error == 0) 995 soisconnected(so); 996 goto out; 997 } 998#endif 999 if (!IN6_IS_ADDR_UNSPECIFIED(&inp->in6p_faddr)) { 1000 error = EISCONN; 1001 goto out; 1002 } 1003 inp->inp_vflag &= ~INP_IPV4; 1004 inp->inp_vflag |= INP_IPV6; 1005 error = prison_remote_ip6(td->td_ucred, &sin6->sin6_addr); 1006 if (error != 0) 1007 goto out; 1008 INP_HASH_WLOCK(&V_udbinfo); 1009 error = in6_pcbconnect(inp, nam, td->td_ucred); 1010 INP_HASH_WUNLOCK(&V_udbinfo); 1011 if (error == 0) 1012 soisconnected(so); 1013out: 1014 INP_WUNLOCK(inp); 1015 return (error); 1016} 1017 1018static void 1019udp6_detach(struct socket *so) 1020{ 1021 struct inpcb *inp; 1022 struct udpcb *up; 1023 1024 inp = sotoinpcb(so); 1025 KASSERT(inp != NULL, ("udp6_detach: inp == NULL")); 1026 1027 INP_INFO_WLOCK(&V_udbinfo); 1028 INP_WLOCK(inp); 1029 up = intoudpcb(inp); 1030 KASSERT(up != NULL, ("%s: up == NULL", __func__)); 1031 in_pcbdetach(inp); 1032 in_pcbfree(inp); 1033 INP_INFO_WUNLOCK(&V_udbinfo); 1034 udp_discardcb(up); 1035} 1036 1037static int 1038udp6_disconnect(struct socket *so) 1039{ 1040 struct inpcb *inp; 1041 int error; 1042 1043 inp = sotoinpcb(so); 1044 KASSERT(inp != NULL, ("udp6_disconnect: inp == NULL")); 1045 1046#ifdef INET 1047 if (inp->inp_vflag & INP_IPV4) { 1048 struct pr_usrreqs *pru; 1049 1050 pru = inetsw[ip_protox[IPPROTO_UDP]].pr_usrreqs; 1051 (void)(*pru->pru_disconnect)(so); 1052 return (0); 1053 } 1054#endif 1055 1056 INP_WLOCK(inp); 1057 1058 if (IN6_IS_ADDR_UNSPECIFIED(&inp->in6p_faddr)) { 1059 error = ENOTCONN; 1060 goto out; 1061 } 1062 1063 INP_HASH_WLOCK(&V_udbinfo); 1064 in6_pcbdisconnect(inp); 1065 inp->in6p_laddr = in6addr_any; 1066 INP_HASH_WUNLOCK(&V_udbinfo); 1067 SOCK_LOCK(so); 1068 so->so_state &= ~SS_ISCONNECTED; /* XXX */ 1069 SOCK_UNLOCK(so); 1070out: 1071 INP_WUNLOCK(inp); 1072 return (0); 1073} 1074 1075static int 1076udp6_send(struct socket *so, int flags, struct mbuf *m, 1077 struct sockaddr *addr, struct mbuf *control, struct thread *td) 1078{ 1079 struct inpcb *inp; 1080 int error = 0; 1081 1082 inp = sotoinpcb(so); 1083 KASSERT(inp != NULL, ("udp6_send: inp == NULL")); 1084 1085 INP_WLOCK(inp); 1086 if (addr) { 1087 if (addr->sa_len != sizeof(struct sockaddr_in6)) { 1088 error = EINVAL; 1089 goto bad; 1090 } 1091 if (addr->sa_family != AF_INET6) { 1092 error = EAFNOSUPPORT; 1093 goto bad; 1094 } 1095 } 1096 1097#ifdef INET 1098 if ((inp->inp_flags & IN6P_IPV6_V6ONLY) == 0) { 1099 int hasv4addr; 1100 struct sockaddr_in6 *sin6 = 0; 1101 1102 if (addr == 0) 1103 hasv4addr = (inp->inp_vflag & INP_IPV4); 1104 else { 1105 sin6 = (struct sockaddr_in6 *)addr; 1106 hasv4addr = IN6_IS_ADDR_V4MAPPED(&sin6->sin6_addr) 1107 ? 1 : 0; 1108 } 1109 if (hasv4addr) { 1110 struct pr_usrreqs *pru; 1111 1112 /* 1113 * XXXRW: We release UDP-layer locks before calling 1114 * udp_send() in order to avoid recursion. However, 1115 * this does mean there is a short window where inp's 1116 * fields are unstable. Could this lead to a 1117 * potential race in which the factors causing us to 1118 * select the UDPv4 output routine are invalidated? 1119 */ 1120 INP_WUNLOCK(inp); 1121 if (sin6) 1122 in6_sin6_2_sin_in_sock(addr); 1123 pru = inetsw[ip_protox[IPPROTO_UDP]].pr_usrreqs; 1124 /* addr will just be freed in sendit(). */ 1125 return ((*pru->pru_send)(so, flags, m, addr, control, 1126 td)); 1127 } 1128 } 1129#endif 1130#ifdef MAC 1131 mac_inpcb_create_mbuf(inp, m); 1132#endif 1133 INP_HASH_WLOCK(&V_udbinfo); 1134 error = udp6_output(inp, m, addr, control, td); 1135 INP_HASH_WUNLOCK(&V_udbinfo); 1136#ifdef INET 1137#endif 1138 INP_WUNLOCK(inp); 1139 return (error); 1140 1141bad: 1142 INP_WUNLOCK(inp); 1143 m_freem(m); 1144 return (error); 1145} 1146 1147struct pr_usrreqs udp6_usrreqs = { 1148 .pru_abort = udp6_abort, 1149 .pru_attach = udp6_attach, 1150 .pru_bind = udp6_bind, 1151 .pru_connect = udp6_connect, 1152 .pru_control = in6_control, 1153 .pru_detach = udp6_detach, 1154 .pru_disconnect = udp6_disconnect, 1155 .pru_peeraddr = in6_mapped_peeraddr, 1156 .pru_send = udp6_send, 1157 .pru_shutdown = udp_shutdown, 1158 .pru_sockaddr = in6_mapped_sockaddr, 1159 .pru_soreceive = soreceive_dgram, 1160 .pru_sosend = sosend_dgram, 1161 .pru_sosetlabel = in_pcbsosetlabel, 1162 .pru_close = udp6_close 1163}; 1164