Now available: The Design and Implementation of the FreeBSD Operating System (Second Edition)
[ source navigation ] [ diff markup ] [ identifier search ] [ freetext search ] [ file search ] [ list types ] [ track identifier ]
FreeBSD/Linux Kernel Cross Reference
sys/netinet6/udp6_usrreq.c
Version:
- FREEBSD - FREEBSD-13-STABLE - FREEBSD-13-0 - FREEBSD-12-STABLE - FREEBSD-12-0 - FREEBSD-11-STABLE - FREEBSD-11-0 - FREEBSD-10-STABLE - FREEBSD-10-0 - FREEBSD-9-STABLE - FREEBSD-9-0 - FREEBSD-8-STABLE - FREEBSD-8-0 - FREEBSD-7-STABLE - FREEBSD-7-0 - FREEBSD-6-STABLE - FREEBSD-6-0 - FREEBSD-5-STABLE - FREEBSD-5-0 - FREEBSD-4-STABLE - FREEBSD-3-STABLE - FREEBSD22 - l41 - OPENBSD - linux-2.6 - MK84 - PLAN9 - xnu-8792
SearchContext: - none - 3 - 10
SearchContext: - none - 3 - 10
1 /*- 2 * Copyright (C) 1995, 1996, 1997, and 1998 WIDE Project. 3 * All rights reserved. 4 * 5 * Redistribution and use in source and binary forms, with or without 6 * modification, are permitted provided that the following conditions 7 * are met: 8 * 1. Redistributions of source code must retain the above copyright 9 * notice, this list of conditions and the following disclaimer. 10 * 2. Redistributions in binary form must reproduce the above copyright 11 * notice, this list of conditions and the following disclaimer in the 12 * documentation and/or other materials provided with the distribution. 13 * 3. Neither the name of the project nor the names of its contributors 14 * may be used to endorse or promote products derived from this software 15 * without specific prior written permission. 16 * 17 * THIS SOFTWARE IS PROVIDED BY THE PROJECT AND CONTRIBUTORS ``AS IS'' AND 18 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 19 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 20 * ARE DISCLAIMED. IN NO EVENT SHALL THE PROJECT OR CONTRIBUTORS BE LIABLE 21 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 22 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 23 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 24 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 25 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 26 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 27 * SUCH DAMAGE. 28 * 29 * $KAME: udp6_usrreq.c,v 1.27 2001/05/21 05:45:10 jinmei Exp $ 30 * $KAME: udp6_output.c,v 1.31 2001/05/21 16:39:15 jinmei Exp $ 31 */ 32 33 /*- 34 * Copyright (c) 1982, 1986, 1988, 1990, 1993, 1995 35 * The Regents of the University of California. 36 * All rights reserved. 37 * 38 * Redistribution and use in source and binary forms, with or without 39 * modification, are permitted provided that the following conditions 40 * are met: 41 * 1. Redistributions of source code must retain the above copyright 42 * notice, this list of conditions and the following disclaimer. 43 * 2. Redistributions in binary form must reproduce the above copyright 44 * notice, this list of conditions and the following disclaimer in the 45 * documentation and/or other materials provided with the distribution. 46 * 4. Neither the name of the University nor the names of its contributors 47 * may be used to endorse or promote products derived from this software 48 * without specific prior written permission. 49 * 50 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND 51 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 52 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 53 * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE 54 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 55 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 56 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 57 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 58 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 59 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 60 * SUCH DAMAGE. 61 * 62 * @(#)udp_usrreq.c 8.6 (Berkeley) 5/23/95 63 */ 64 65 #include <sys/cdefs.h> 66 __FBSDID("$FreeBSD: releng/8.4/sys/netinet6/udp6_usrreq.c 249660 2013-04-19 21:08:56Z rwatson $"); 67 68 #include "opt_inet.h" 69 #include "opt_inet6.h" 70 #include "opt_ipsec.h" 71 72 #include <sys/param.h> 73 #include <sys/jail.h> 74 #include <sys/kernel.h> 75 #include <sys/lock.h> 76 #include <sys/mbuf.h> 77 #include <sys/priv.h> 78 #include <sys/proc.h> 79 #include <sys/protosw.h> 80 #include <sys/signalvar.h> 81 #include <sys/socket.h> 82 #include <sys/socketvar.h> 83 #include <sys/sx.h> 84 #include <sys/sysctl.h> 85 #include <sys/syslog.h> 86 #include <sys/systm.h> 87 88 #include <net/if.h> 89 #include <net/if_types.h> 90 #include <net/route.h> 91 92 #include <netinet/in.h> 93 #include <netinet/in_pcb.h> 94 #include <netinet/in_systm.h> 95 #include <netinet/in_var.h> 96 #include <netinet/ip.h> 97 #include <netinet/ip_icmp.h> 98 #include <netinet/ip6.h> 99 #include <netinet/icmp_var.h> 100 #include <netinet/icmp6.h> 101 #include <netinet/ip_var.h> 102 #include <netinet/udp.h> 103 #include <netinet/udp_var.h> 104 105 #include <netinet6/ip6protosw.h> 106 #include <netinet6/ip6_var.h> 107 #include <netinet6/in6_pcb.h> 108 #include <netinet6/udp6_var.h> 109 #include <netinet6/scope6_var.h> 110 111 #ifdef IPSEC 112 #include <netipsec/ipsec.h> 113 #include <netipsec/ipsec6.h> 114 #endif /* IPSEC */ 115 116 #include <security/mac/mac_framework.h> 117 118 /* 119 * UDP protocol implementation. 120 * Per RFC 768, August, 1980. 121 */ 122 123 extern struct protosw inetsw[]; 124 static void udp6_detach(struct socket *so); 125 126 static void 127 udp6_append(struct inpcb *inp, struct mbuf *n, int off, 128 struct sockaddr_in6 *fromsa) 129 { 130 struct socket *so; 131 struct mbuf *opts; 132 133 INP_LOCK_ASSERT(inp); 134 135 #ifdef IPSEC 136 /* Check AH/ESP integrity. */ 137 if (ipsec6_in_reject(n, inp)) { 138 m_freem(n); 139 V_ipsec6stat.in_polvio++; 140 return; 141 } 142 #endif /* IPSEC */ 143 #ifdef MAC 144 if (mac_inpcb_check_deliver(inp, n) != 0) { 145 m_freem(n); 146 return; 147 } 148 #endif 149 opts = NULL; 150 if (inp->inp_flags & INP_CONTROLOPTS || 151 inp->inp_socket->so_options & SO_TIMESTAMP) 152 ip6_savecontrol(inp, n, &opts); 153 m_adj(n, off + sizeof(struct udphdr)); 154 155 so = inp->inp_socket; 156 SOCKBUF_LOCK(&so->so_rcv); 157 if (sbappendaddr_locked(&so->so_rcv, (struct sockaddr *)fromsa, n, 158 opts) == 0) { 159 SOCKBUF_UNLOCK(&so->so_rcv); 160 m_freem(n); 161 if (opts) 162 m_freem(opts); 163 UDPSTAT_INC(udps_fullsock); 164 } else 165 sorwakeup_locked(so); 166 } 167 168 int 169 udp6_input(struct mbuf **mp, int *offp, int proto) 170 { 171 struct mbuf *m = *mp; 172 struct ifnet *ifp; 173 struct ip6_hdr *ip6; 174 struct udphdr *uh; 175 struct inpcb *inp; 176 struct udpcb *up; 177 int off = *offp; 178 int plen, ulen; 179 struct sockaddr_in6 fromsa; 180 181 ifp = m->m_pkthdr.rcvif; 182 ip6 = mtod(m, struct ip6_hdr *); 183 184 if (faithprefix_p != NULL && (*faithprefix_p)(&ip6->ip6_dst)) { 185 /* XXX send icmp6 host/port unreach? */ 186 m_freem(m); 187 return (IPPROTO_DONE); 188 } 189 190 #ifndef PULLDOWN_TEST 191 IP6_EXTHDR_CHECK(m, off, sizeof(struct udphdr), IPPROTO_DONE); 192 ip6 = mtod(m, struct ip6_hdr *); 193 uh = (struct udphdr *)((caddr_t)ip6 + off); 194 #else 195 IP6_EXTHDR_GET(uh, struct udphdr *, m, off, sizeof(*uh)); 196 if (!uh) 197 return (IPPROTO_DONE); 198 #endif 199 200 UDPSTAT_INC(udps_ipackets); 201 202 /* 203 * Destination port of 0 is illegal, based on RFC768. 204 */ 205 if (uh->uh_dport == 0) 206 goto badunlocked; 207 208 plen = ntohs(ip6->ip6_plen) - off + sizeof(*ip6); 209 ulen = ntohs((u_short)uh->uh_ulen); 210 211 if (plen != ulen) { 212 UDPSTAT_INC(udps_badlen); 213 goto badunlocked; 214 } 215 216 /* 217 * Checksum extended UDP header and data. 218 */ 219 if (uh->uh_sum == 0) { 220 UDPSTAT_INC(udps_nosum); 221 goto badunlocked; 222 } 223 if (in6_cksum(m, IPPROTO_UDP, off, ulen) != 0) { 224 UDPSTAT_INC(udps_badsum); 225 goto badunlocked; 226 } 227 228 /* 229 * Construct sockaddr format source address. 230 */ 231 init_sin6(&fromsa, m); 232 fromsa.sin6_port = uh->uh_sport; 233 234 INP_INFO_RLOCK(&V_udbinfo); 235 if (IN6_IS_ADDR_MULTICAST(&ip6->ip6_dst)) { 236 struct inpcb *last; 237 struct ip6_moptions *imo; 238 239 /* 240 * In the event that laddr should be set to the link-local 241 * address (this happens in RIPng), the multicast address 242 * specified in the received packet will not match laddr. To 243 * handle this situation, matching is relaxed if the 244 * receiving interface is the same as one specified in the 245 * socket and if the destination multicast address matches 246 * one of the multicast groups specified in the socket. 247 */ 248 249 /* 250 * KAME note: traditionally we dropped udpiphdr from mbuf 251 * here. We need udphdr for IPsec processing so we do that 252 * later. 253 */ 254 last = NULL; 255 LIST_FOREACH(inp, &V_udb, inp_list) { 256 if ((inp->inp_vflag & INP_IPV6) == 0) 257 continue; 258 if (inp->inp_lport != uh->uh_dport) 259 continue; 260 if (inp->inp_fport != 0 && 261 inp->inp_fport != uh->uh_sport) 262 continue; 263 if (!IN6_IS_ADDR_UNSPECIFIED(&inp->in6p_laddr)) { 264 if (!IN6_ARE_ADDR_EQUAL(&inp->in6p_laddr, 265 &ip6->ip6_dst)) 266 continue; 267 } 268 if (!IN6_IS_ADDR_UNSPECIFIED(&inp->in6p_faddr)) { 269 if (!IN6_ARE_ADDR_EQUAL(&inp->in6p_faddr, 270 &ip6->ip6_src) || 271 inp->inp_fport != uh->uh_sport) 272 continue; 273 } 274 275 /* 276 * Detached PCBs can linger in the list if someone 277 * holds a reference. (e.g. udp_pcblist) 278 */ 279 if (inp->inp_socket == NULL) 280 continue; 281 282 /* 283 * Handle socket delivery policy for any-source 284 * and source-specific multicast. [RFC3678] 285 */ 286 imo = inp->in6p_moptions; 287 if (imo && IN6_IS_ADDR_MULTICAST(&ip6->ip6_dst)) { 288 struct sockaddr_in6 mcaddr; 289 int blocked; 290 291 INP_RLOCK(inp); 292 293 bzero(&mcaddr, sizeof(struct sockaddr_in6)); 294 mcaddr.sin6_len = sizeof(struct sockaddr_in6); 295 mcaddr.sin6_family = AF_INET6; 296 mcaddr.sin6_addr = ip6->ip6_dst; 297 298 blocked = im6o_mc_filter(imo, ifp, 299 (struct sockaddr *)&mcaddr, 300 (struct sockaddr *)&fromsa); 301 if (blocked != MCAST_PASS) { 302 if (blocked == MCAST_NOTGMEMBER) 303 IP6STAT_INC(ip6s_notmember); 304 if (blocked == MCAST_NOTSMEMBER || 305 blocked == MCAST_MUTED) 306 UDPSTAT_INC(udps_filtermcast); 307 INP_RUNLOCK(inp); /* XXX */ 308 continue; 309 } 310 311 INP_RUNLOCK(inp); 312 } 313 if (last != NULL) { 314 struct mbuf *n; 315 316 if ((n = m_copy(m, 0, M_COPYALL)) != NULL) { 317 INP_RLOCK(last); 318 up = intoudpcb(last); 319 if (up->u_tun_func == NULL) { 320 udp6_append(last, n, off, &fromsa); 321 } else { 322 /* 323 * Engage the tunneling 324 * protocol we will have to 325 * leave the info_lock up, 326 * since we are hunting 327 * through multiple UDP's. 328 * 329 */ 330 (*up->u_tun_func)(n, off, last); 331 } 332 INP_RUNLOCK(last); 333 } 334 } 335 last = inp; 336 /* 337 * Don't look for additional matches if this one does 338 * not have either the SO_REUSEPORT or SO_REUSEADDR 339 * socket options set. This heuristic avoids 340 * searching through all pcbs in the common case of a 341 * non-shared port. It assumes that an application 342 * will never clear these options after setting them. 343 */ 344 if ((last->inp_socket->so_options & 345 (SO_REUSEPORT|SO_REUSEADDR)) == 0) 346 break; 347 } 348 349 if (last == NULL) { 350 /* 351 * No matching pcb found; discard datagram. (No need 352 * to send an ICMP Port Unreachable for a broadcast 353 * or multicast datgram.) 354 */ 355 UDPSTAT_INC(udps_noport); 356 UDPSTAT_INC(udps_noportmcast); 357 goto badheadlocked; 358 } 359 INP_RLOCK(last); 360 INP_INFO_RUNLOCK(&V_udbinfo); 361 up = intoudpcb(last); 362 if (up->u_tun_func == NULL) { 363 udp6_append(last, m, off, &fromsa); 364 } else { 365 /* 366 * Engage the tunneling protocol. 367 */ 368 (*up->u_tun_func)(m, off, last); 369 } 370 INP_RUNLOCK(last); 371 return (IPPROTO_DONE); 372 } 373 /* 374 * Locate pcb for datagram. 375 */ 376 inp = in6_pcblookup_hash(&V_udbinfo, &ip6->ip6_src, uh->uh_sport, 377 &ip6->ip6_dst, uh->uh_dport, 1, m->m_pkthdr.rcvif); 378 if (inp == NULL) { 379 if (udp_log_in_vain) { 380 char ip6bufs[INET6_ADDRSTRLEN]; 381 char ip6bufd[INET6_ADDRSTRLEN]; 382 383 log(LOG_INFO, 384 "Connection attempt to UDP [%s]:%d from [%s]:%d\n", 385 ip6_sprintf(ip6bufd, &ip6->ip6_dst), 386 ntohs(uh->uh_dport), 387 ip6_sprintf(ip6bufs, &ip6->ip6_src), 388 ntohs(uh->uh_sport)); 389 } 390 UDPSTAT_INC(udps_noport); 391 if (m->m_flags & M_MCAST) { 392 printf("UDP6: M_MCAST is set in a unicast packet.\n"); 393 UDPSTAT_INC(udps_noportmcast); 394 goto badheadlocked; 395 } 396 INP_INFO_RUNLOCK(&V_udbinfo); 397 if (V_udp_blackhole) 398 goto badunlocked; 399 if (badport_bandlim(BANDLIM_ICMP6_UNREACH) < 0) 400 goto badunlocked; 401 icmp6_error(m, ICMP6_DST_UNREACH, ICMP6_DST_UNREACH_NOPORT, 0); 402 return (IPPROTO_DONE); 403 } 404 INP_RLOCK(inp); 405 INP_INFO_RUNLOCK(&V_udbinfo); 406 407 /* 408 * Detached PCBs can linger in the hash table if someone holds a 409 * reference. (e.g. udp_pcblist) 410 */ 411 if (inp->inp_socket == NULL) { 412 INP_RUNLOCK(inp); 413 goto badunlocked; 414 } 415 up = intoudpcb(inp); 416 if (up->u_tun_func == NULL) { 417 udp6_append(inp, m, off, &fromsa); 418 } else { 419 /* 420 * Engage the tunneling protocol. 421 */ 422 423 (*up->u_tun_func)(m, off, inp); 424 } 425 INP_RUNLOCK(inp); 426 return (IPPROTO_DONE); 427 428 badheadlocked: 429 INP_INFO_RUNLOCK(&V_udbinfo); 430 badunlocked: 431 if (m) 432 m_freem(m); 433 return (IPPROTO_DONE); 434 } 435 436 void 437 udp6_ctlinput(int cmd, struct sockaddr *sa, void *d) 438 { 439 struct udphdr uh; 440 struct ip6_hdr *ip6; 441 struct mbuf *m; 442 int off = 0; 443 struct ip6ctlparam *ip6cp = NULL; 444 const struct sockaddr_in6 *sa6_src = NULL; 445 void *cmdarg; 446 struct inpcb *(*notify)(struct inpcb *, int) = udp_notify; 447 struct udp_portonly { 448 u_int16_t uh_sport; 449 u_int16_t uh_dport; 450 } *uhp; 451 452 if (sa->sa_family != AF_INET6 || 453 sa->sa_len != sizeof(struct sockaddr_in6)) 454 return; 455 456 if ((unsigned)cmd >= PRC_NCMDS) 457 return; 458 if (PRC_IS_REDIRECT(cmd)) 459 notify = in6_rtchange, d = NULL; 460 else if (cmd == PRC_HOSTDEAD) 461 d = NULL; 462 else if (inet6ctlerrmap[cmd] == 0) 463 return; 464 465 /* if the parameter is from icmp6, decode it. */ 466 if (d != NULL) { 467 ip6cp = (struct ip6ctlparam *)d; 468 m = ip6cp->ip6c_m; 469 ip6 = ip6cp->ip6c_ip6; 470 off = ip6cp->ip6c_off; 471 cmdarg = ip6cp->ip6c_cmdarg; 472 sa6_src = ip6cp->ip6c_src; 473 } else { 474 m = NULL; 475 ip6 = NULL; 476 cmdarg = NULL; 477 sa6_src = &sa6_any; 478 } 479 480 if (ip6) { 481 /* 482 * XXX: We assume that when IPV6 is non NULL, 483 * M and OFF are valid. 484 */ 485 486 /* Check if we can safely examine src and dst ports. */ 487 if (m->m_pkthdr.len < off + sizeof(*uhp)) 488 return; 489 490 bzero(&uh, sizeof(uh)); 491 m_copydata(m, off, sizeof(*uhp), (caddr_t)&uh); 492 493 (void) in6_pcbnotify(&V_udbinfo, sa, uh.uh_dport, 494 (struct sockaddr *)ip6cp->ip6c_src, uh.uh_sport, cmd, 495 cmdarg, notify); 496 } else 497 (void) in6_pcbnotify(&V_udbinfo, sa, 0, 498 (const struct sockaddr *)sa6_src, 0, cmd, cmdarg, notify); 499 } 500 501 static int 502 udp6_getcred(SYSCTL_HANDLER_ARGS) 503 { 504 struct xucred xuc; 505 struct sockaddr_in6 addrs[2]; 506 struct inpcb *inp; 507 int error; 508 509 error = priv_check(req->td, PRIV_NETINET_GETCRED); 510 if (error) 511 return (error); 512 513 if (req->newlen != sizeof(addrs)) 514 return (EINVAL); 515 if (req->oldlen != sizeof(struct xucred)) 516 return (EINVAL); 517 error = SYSCTL_IN(req, addrs, sizeof(addrs)); 518 if (error) 519 return (error); 520 if ((error = sa6_embedscope(&addrs[0], V_ip6_use_defzone)) != 0 || 521 (error = sa6_embedscope(&addrs[1], V_ip6_use_defzone)) != 0) { 522 return (error); 523 } 524 INP_INFO_RLOCK(&V_udbinfo); 525 inp = in6_pcblookup_hash(&V_udbinfo, &addrs[1].sin6_addr, 526 addrs[1].sin6_port, &addrs[0].sin6_addr, addrs[0].sin6_port, 1, 527 NULL); 528 if (inp != NULL) { 529 INP_RLOCK(inp); 530 INP_INFO_RUNLOCK(&V_udbinfo); 531 if (inp->inp_socket == NULL) 532 error = ENOENT; 533 if (error == 0) 534 error = cr_canseesocket(req->td->td_ucred, 535 inp->inp_socket); 536 if (error == 0) 537 cru2x(inp->inp_cred, &xuc); 538 INP_RUNLOCK(inp); 539 } else { 540 INP_INFO_RUNLOCK(&V_udbinfo); 541 error = ENOENT; 542 } 543 if (error == 0) 544 error = SYSCTL_OUT(req, &xuc, sizeof(struct xucred)); 545 return (error); 546 } 547 548 SYSCTL_PROC(_net_inet6_udp6, OID_AUTO, getcred, CTLTYPE_OPAQUE|CTLFLAG_RW, 0, 549 0, udp6_getcred, "S,xucred", "Get the xucred of a UDP6 connection"); 550 551 static int 552 udp6_output(struct inpcb *inp, struct mbuf *m, struct sockaddr *addr6, 553 struct mbuf *control, struct thread *td) 554 { 555 u_int32_t ulen = m->m_pkthdr.len; 556 u_int32_t plen = sizeof(struct udphdr) + ulen; 557 struct ip6_hdr *ip6; 558 struct udphdr *udp6; 559 struct in6_addr *laddr, *faddr, in6a; 560 struct sockaddr_in6 *sin6 = NULL; 561 struct ifnet *oifp = NULL; 562 int scope_ambiguous = 0; 563 u_short fport; 564 int error = 0; 565 struct ip6_pktopts *optp, opt; 566 int af = AF_INET6, hlen = sizeof(struct ip6_hdr); 567 int flags; 568 struct sockaddr_in6 tmp; 569 570 INP_WLOCK_ASSERT(inp); 571 572 if (addr6) { 573 /* addr6 has been validated in udp6_send(). */ 574 sin6 = (struct sockaddr_in6 *)addr6; 575 576 /* protect *sin6 from overwrites */ 577 tmp = *sin6; 578 sin6 = &tmp; 579 580 /* 581 * Application should provide a proper zone ID or the use of 582 * default zone IDs should be enabled. Unfortunately, some 583 * applications do not behave as it should, so we need a 584 * workaround. Even if an appropriate ID is not determined, 585 * we'll see if we can determine the outgoing interface. If we 586 * can, determine the zone ID based on the interface below. 587 */ 588 if (sin6->sin6_scope_id == 0 && !V_ip6_use_defzone) 589 scope_ambiguous = 1; 590 if ((error = sa6_embedscope(sin6, V_ip6_use_defzone)) != 0) 591 return (error); 592 } 593 594 if (control) { 595 if ((error = ip6_setpktopts(control, &opt, 596 inp->in6p_outputopts, td->td_ucred, IPPROTO_UDP)) != 0) 597 goto release; 598 optp = &opt; 599 } else 600 optp = inp->in6p_outputopts; 601 602 if (sin6) { 603 faddr = &sin6->sin6_addr; 604 605 /* 606 * IPv4 version of udp_output calls in_pcbconnect in this case, 607 * which needs splnet and affects performance. 608 * Since we saw no essential reason for calling in_pcbconnect, 609 * we get rid of such kind of logic, and call in6_selectsrc 610 * and in6_pcbsetport in order to fill in the local address 611 * and the local port. 612 */ 613 if (sin6->sin6_port == 0) { 614 error = EADDRNOTAVAIL; 615 goto release; 616 } 617 618 if (!IN6_IS_ADDR_UNSPECIFIED(&inp->in6p_faddr)) { 619 /* how about ::ffff:0.0.0.0 case? */ 620 error = EISCONN; 621 goto release; 622 } 623 624 fport = sin6->sin6_port; /* allow 0 port */ 625 626 if (IN6_IS_ADDR_V4MAPPED(faddr)) { 627 if ((inp->inp_flags & IN6P_IPV6_V6ONLY)) { 628 /* 629 * I believe we should explicitly discard the 630 * packet when mapped addresses are disabled, 631 * rather than send the packet as an IPv6 one. 632 * If we chose the latter approach, the packet 633 * might be sent out on the wire based on the 634 * default route, the situation which we'd 635 * probably want to avoid. 636 * (20010421 jinmei@kame.net) 637 */ 638 error = EINVAL; 639 goto release; 640 } 641 if (!IN6_IS_ADDR_UNSPECIFIED(&inp->in6p_laddr) && 642 !IN6_IS_ADDR_V4MAPPED(&inp->in6p_laddr)) { 643 /* 644 * when remote addr is an IPv4-mapped address, 645 * local addr should not be an IPv6 address, 646 * since you cannot determine how to map IPv6 647 * source address to IPv4. 648 */ 649 error = EINVAL; 650 goto release; 651 } 652 653 af = AF_INET; 654 } 655 656 if (!IN6_IS_ADDR_V4MAPPED(faddr)) { 657 error = in6_selectsrc(sin6, optp, inp, NULL, 658 td->td_ucred, &oifp, &in6a); 659 if (error) 660 goto release; 661 if (oifp && scope_ambiguous && 662 (error = in6_setscope(&sin6->sin6_addr, 663 oifp, NULL))) { 664 goto release; 665 } 666 laddr = &in6a; 667 } else 668 laddr = &inp->in6p_laddr; /* XXX */ 669 if (laddr == NULL) { 670 if (error == 0) 671 error = EADDRNOTAVAIL; 672 goto release; 673 } 674 if (inp->inp_lport == 0 && 675 (error = in6_pcbsetport(laddr, inp, td->td_ucred)) != 0) { 676 /* Undo an address bind that may have occurred. */ 677 inp->in6p_laddr = in6addr_any; 678 goto release; 679 } 680 } else { 681 if (IN6_IS_ADDR_UNSPECIFIED(&inp->in6p_faddr)) { 682 error = ENOTCONN; 683 goto release; 684 } 685 if (IN6_IS_ADDR_V4MAPPED(&inp->in6p_faddr)) { 686 if ((inp->inp_flags & IN6P_IPV6_V6ONLY)) { 687 /* 688 * XXX: this case would happen when the 689 * application sets the V6ONLY flag after 690 * connecting the foreign address. 691 * Such applications should be fixed, 692 * so we bark here. 693 */ 694 log(LOG_INFO, "udp6_output: IPV6_V6ONLY " 695 "option was set for a connected socket\n"); 696 error = EINVAL; 697 goto release; 698 } else 699 af = AF_INET; 700 } 701 laddr = &inp->in6p_laddr; 702 faddr = &inp->in6p_faddr; 703 fport = inp->inp_fport; 704 } 705 706 if (af == AF_INET) 707 hlen = sizeof(struct ip); 708 709 /* 710 * Calculate data length and get a mbuf 711 * for UDP and IP6 headers. 712 */ 713 M_PREPEND(m, hlen + sizeof(struct udphdr), M_DONTWAIT); 714 if (m == 0) { 715 error = ENOBUFS; 716 goto release; 717 } 718 719 /* 720 * Stuff checksum and output datagram. 721 */ 722 udp6 = (struct udphdr *)(mtod(m, caddr_t) + hlen); 723 udp6->uh_sport = inp->inp_lport; /* lport is always set in the PCB */ 724 udp6->uh_dport = fport; 725 if (plen <= 0xffff) 726 udp6->uh_ulen = htons((u_short)plen); 727 else 728 udp6->uh_ulen = 0; 729 udp6->uh_sum = 0; 730 731 switch (af) { 732 case AF_INET6: 733 ip6 = mtod(m, struct ip6_hdr *); 734 ip6->ip6_flow = inp->inp_flow & IPV6_FLOWINFO_MASK; 735 ip6->ip6_vfc &= ~IPV6_VERSION_MASK; 736 ip6->ip6_vfc |= IPV6_VERSION; 737 #if 0 /* ip6_plen will be filled in ip6_output. */ 738 ip6->ip6_plen = htons((u_short)plen); 739 #endif 740 ip6->ip6_nxt = IPPROTO_UDP; 741 ip6->ip6_hlim = in6_selecthlim(inp, NULL); 742 ip6->ip6_src = *laddr; 743 ip6->ip6_dst = *faddr; 744 745 if ((udp6->uh_sum = in6_cksum(m, IPPROTO_UDP, 746 sizeof(struct ip6_hdr), plen)) == 0) { 747 udp6->uh_sum = 0xffff; 748 } 749 750 flags = 0; 751 752 UDPSTAT_INC(udps_opackets); 753 error = ip6_output(m, optp, NULL, flags, inp->in6p_moptions, 754 NULL, inp); 755 break; 756 case AF_INET: 757 error = EAFNOSUPPORT; 758 goto release; 759 } 760 goto releaseopt; 761 762 release: 763 m_freem(m); 764 765 releaseopt: 766 if (control) { 767 ip6_clearpktopts(&opt, -1); 768 m_freem(control); 769 } 770 return (error); 771 } 772 773 static void 774 udp6_abort(struct socket *so) 775 { 776 struct inpcb *inp; 777 778 inp = sotoinpcb(so); 779 KASSERT(inp != NULL, ("udp6_abort: inp == NULL")); 780 781 #ifdef INET 782 if (inp->inp_vflag & INP_IPV4) { 783 struct pr_usrreqs *pru; 784 785 pru = inetsw[ip_protox[IPPROTO_UDP]].pr_usrreqs; 786 (*pru->pru_abort)(so); 787 return; 788 } 789 #endif 790 791 INP_INFO_WLOCK(&V_udbinfo); 792 INP_WLOCK(inp); 793 if (!IN6_IS_ADDR_UNSPECIFIED(&inp->in6p_faddr)) { 794 in6_pcbdisconnect(inp); 795 inp->in6p_laddr = in6addr_any; 796 soisdisconnected(so); 797 } 798 INP_WUNLOCK(inp); 799 INP_INFO_WUNLOCK(&V_udbinfo); 800 } 801 802 static int 803 udp6_attach(struct socket *so, int proto, struct thread *td) 804 { 805 struct inpcb *inp; 806 int error; 807 808 inp = sotoinpcb(so); 809 KASSERT(inp == NULL, ("udp6_attach: inp != NULL")); 810 811 if (so->so_snd.sb_hiwat == 0 || so->so_rcv.sb_hiwat == 0) { 812 error = soreserve(so, udp_sendspace, udp_recvspace); 813 if (error) 814 return (error); 815 } 816 INP_INFO_WLOCK(&V_udbinfo); 817 error = in_pcballoc(so, &V_udbinfo); 818 if (error) { 819 INP_INFO_WUNLOCK(&V_udbinfo); 820 return (error); 821 } 822 inp = (struct inpcb *)so->so_pcb; 823 inp->inp_vflag |= INP_IPV6; 824 if ((inp->inp_flags & IN6P_IPV6_V6ONLY) == 0) 825 inp->inp_vflag |= INP_IPV4; 826 inp->in6p_hops = -1; /* use kernel default */ 827 inp->in6p_cksum = -1; /* just to be sure */ 828 /* 829 * XXX: ugly!! 830 * IPv4 TTL initialization is necessary for an IPv6 socket as well, 831 * because the socket may be bound to an IPv6 wildcard address, 832 * which may match an IPv4-mapped IPv6 address. 833 */ 834 inp->inp_ip_ttl = V_ip_defttl; 835 836 error = udp_newudpcb(inp); 837 if (error) { 838 in_pcbdetach(inp); 839 in_pcbfree(inp); 840 INP_INFO_WUNLOCK(&V_udbinfo); 841 return (error); 842 } 843 INP_WUNLOCK(inp); 844 INP_INFO_WUNLOCK(&V_udbinfo); 845 return (0); 846 } 847 848 static int 849 udp6_bind(struct socket *so, struct sockaddr *nam, struct thread *td) 850 { 851 struct inpcb *inp; 852 int error; 853 854 inp = sotoinpcb(so); 855 KASSERT(inp != NULL, ("udp6_bind: inp == NULL")); 856 857 INP_INFO_WLOCK(&V_udbinfo); 858 INP_WLOCK(inp); 859 inp->inp_vflag &= ~INP_IPV4; 860 inp->inp_vflag |= INP_IPV6; 861 if ((inp->inp_flags & IN6P_IPV6_V6ONLY) == 0) { 862 struct sockaddr_in6 *sin6_p; 863 864 sin6_p = (struct sockaddr_in6 *)nam; 865 866 if (IN6_IS_ADDR_UNSPECIFIED(&sin6_p->sin6_addr)) 867 inp->inp_vflag |= INP_IPV4; 868 else if (IN6_IS_ADDR_V4MAPPED(&sin6_p->sin6_addr)) { 869 struct sockaddr_in sin; 870 871 in6_sin6_2_sin(&sin, sin6_p); 872 inp->inp_vflag |= INP_IPV4; 873 inp->inp_vflag &= ~INP_IPV6; 874 error = in_pcbbind(inp, (struct sockaddr *)&sin, 875 td->td_ucred); 876 goto out; 877 } 878 } 879 880 error = in6_pcbbind(inp, nam, td->td_ucred); 881 out: 882 INP_WUNLOCK(inp); 883 INP_INFO_WUNLOCK(&V_udbinfo); 884 return (error); 885 } 886 887 static void 888 udp6_close(struct socket *so) 889 { 890 struct inpcb *inp; 891 892 inp = sotoinpcb(so); 893 KASSERT(inp != NULL, ("udp6_close: inp == NULL")); 894 895 #ifdef INET 896 if (inp->inp_vflag & INP_IPV4) { 897 struct pr_usrreqs *pru; 898 899 pru = inetsw[ip_protox[IPPROTO_UDP]].pr_usrreqs; 900 (*pru->pru_disconnect)(so); 901 return; 902 } 903 #endif 904 INP_INFO_WLOCK(&V_udbinfo); 905 INP_WLOCK(inp); 906 if (!IN6_IS_ADDR_UNSPECIFIED(&inp->in6p_faddr)) { 907 in6_pcbdisconnect(inp); 908 inp->in6p_laddr = in6addr_any; 909 soisdisconnected(so); 910 } 911 INP_WUNLOCK(inp); 912 INP_INFO_WUNLOCK(&V_udbinfo); 913 } 914 915 static int 916 udp6_connect(struct socket *so, struct sockaddr *nam, struct thread *td) 917 { 918 struct inpcb *inp; 919 struct sockaddr_in6 *sin6; 920 int error; 921 922 inp = sotoinpcb(so); 923 sin6 = (struct sockaddr_in6 *)nam; 924 KASSERT(inp != NULL, ("udp6_connect: inp == NULL")); 925 926 INP_INFO_WLOCK(&V_udbinfo); 927 INP_WLOCK(inp); 928 if (IN6_IS_ADDR_V4MAPPED(&sin6->sin6_addr)) { 929 struct sockaddr_in sin; 930 931 if ((inp->inp_flags & IN6P_IPV6_V6ONLY) != 0) { 932 error = EINVAL; 933 goto out; 934 } 935 if (inp->inp_faddr.s_addr != INADDR_ANY) { 936 error = EISCONN; 937 goto out; 938 } 939 in6_sin6_2_sin(&sin, sin6); 940 inp->inp_vflag |= INP_IPV4; 941 inp->inp_vflag &= ~INP_IPV6; 942 error = prison_remote_ip4(td->td_ucred, &sin.sin_addr); 943 if (error != 0) 944 goto out; 945 error = in_pcbconnect(inp, (struct sockaddr *)&sin, 946 td->td_ucred); 947 if (error == 0) 948 soisconnected(so); 949 goto out; 950 } 951 if (!IN6_IS_ADDR_UNSPECIFIED(&inp->in6p_faddr)) { 952 error = EISCONN; 953 goto out; 954 } 955 inp->inp_vflag &= ~INP_IPV4; 956 inp->inp_vflag |= INP_IPV6; 957 error = prison_remote_ip6(td->td_ucred, &sin6->sin6_addr); 958 if (error != 0) 959 goto out; 960 error = in6_pcbconnect(inp, nam, td->td_ucred); 961 if (error == 0) 962 soisconnected(so); 963 out: 964 INP_WUNLOCK(inp); 965 INP_INFO_WUNLOCK(&V_udbinfo); 966 return (error); 967 } 968 969 static void 970 udp6_detach(struct socket *so) 971 { 972 struct inpcb *inp; 973 struct udpcb *up; 974 975 inp = sotoinpcb(so); 976 KASSERT(inp != NULL, ("udp6_detach: inp == NULL")); 977 978 INP_INFO_WLOCK(&V_udbinfo); 979 INP_WLOCK(inp); 980 up = intoudpcb(inp); 981 KASSERT(up != NULL, ("%s: up == NULL", __func__)); 982 in_pcbdetach(inp); 983 in_pcbfree(inp); 984 INP_INFO_WUNLOCK(&V_udbinfo); 985 udp_discardcb(up); 986 } 987 988 static int 989 udp6_disconnect(struct socket *so) 990 { 991 struct inpcb *inp; 992 int error; 993 994 inp = sotoinpcb(so); 995 KASSERT(inp != NULL, ("udp6_disconnect: inp == NULL")); 996 997 INP_INFO_WLOCK(&V_udbinfo); 998 INP_WLOCK(inp); 999 1000 #ifdef INET 1001 if (inp->inp_vflag & INP_IPV4) { 1002 struct pr_usrreqs *pru; 1003 1004 pru = inetsw[ip_protox[IPPROTO_UDP]].pr_usrreqs; 1005 error = (*pru->pru_disconnect)(so); 1006 goto out; 1007 } 1008 #endif 1009 1010 if (IN6_IS_ADDR_UNSPECIFIED(&inp->in6p_faddr)) { 1011 error = ENOTCONN; 1012 goto out; 1013 } 1014 1015 in6_pcbdisconnect(inp); 1016 inp->in6p_laddr = in6addr_any; 1017 SOCK_LOCK(so); 1018 so->so_state &= ~SS_ISCONNECTED; /* XXX */ 1019 SOCK_UNLOCK(so); 1020 out: 1021 INP_WUNLOCK(inp); 1022 INP_INFO_WUNLOCK(&V_udbinfo); 1023 return (0); 1024 } 1025 1026 static int 1027 udp6_send(struct socket *so, int flags, struct mbuf *m, 1028 struct sockaddr *addr, struct mbuf *control, struct thread *td) 1029 { 1030 struct inpcb *inp; 1031 int error = 0; 1032 1033 inp = sotoinpcb(so); 1034 KASSERT(inp != NULL, ("udp6_send: inp == NULL")); 1035 1036 INP_INFO_WLOCK(&V_udbinfo); 1037 INP_WLOCK(inp); 1038 if (addr) { 1039 if (addr->sa_len != sizeof(struct sockaddr_in6)) { 1040 error = EINVAL; 1041 goto bad; 1042 } 1043 if (addr->sa_family != AF_INET6) { 1044 error = EAFNOSUPPORT; 1045 goto bad; 1046 } 1047 } 1048 1049 #ifdef INET 1050 if ((inp->inp_flags & IN6P_IPV6_V6ONLY) == 0) { 1051 int hasv4addr; 1052 struct sockaddr_in6 *sin6 = 0; 1053 1054 if (addr == 0) 1055 hasv4addr = (inp->inp_vflag & INP_IPV4); 1056 else { 1057 sin6 = (struct sockaddr_in6 *)addr; 1058 hasv4addr = IN6_IS_ADDR_V4MAPPED(&sin6->sin6_addr) 1059 ? 1 : 0; 1060 } 1061 if (hasv4addr) { 1062 struct pr_usrreqs *pru; 1063 1064 /* 1065 * XXXRW: We release UDP-layer locks before calling 1066 * udp_send() in order to avoid recursion. However, 1067 * this does mean there is a short window where inp's 1068 * fields are unstable. Could this lead to a 1069 * potential race in which the factors causing us to 1070 * select the UDPv4 output routine are invalidated? 1071 */ 1072 INP_WUNLOCK(inp); 1073 INP_INFO_WUNLOCK(&V_udbinfo); 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 error = udp6_output(inp, m, addr, control, td); 1087 INP_WUNLOCK(inp); 1088 INP_INFO_WUNLOCK(&V_udbinfo); 1089 return (error); 1090 1091 bad: 1092 INP_WUNLOCK(inp); 1093 INP_INFO_WUNLOCK(&V_udbinfo); 1094 m_freem(m); 1095 return (error); 1096 } 1097 1098 struct pr_usrreqs udp6_usrreqs = { 1099 .pru_abort = udp6_abort, 1100 .pru_attach = udp6_attach, 1101 .pru_bind = udp6_bind, 1102 .pru_connect = udp6_connect, 1103 .pru_control = in6_control, 1104 .pru_detach = udp6_detach, 1105 .pru_disconnect = udp6_disconnect, 1106 .pru_peeraddr = in6_mapped_peeraddr, 1107 .pru_send = udp6_send, 1108 .pru_shutdown = udp_shutdown, 1109 .pru_sockaddr = in6_mapped_sockaddr, 1110 .pru_soreceive = soreceive_dgram, 1111 .pru_sosend = sosend_dgram, 1112 .pru_sosetlabel = in_pcbsosetlabel, 1113 .pru_close = udp6_close 1114 };
Cache object: ad264fde64d12b86b8e1c849840cfdbf
[ source navigation ] [ diff markup ] [ identifier search ] [ freetext search ] [ file search ] [ list types ] [ track identifier ]