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/7.3/sys/netinet6/udp6_usrreq.c 202914 2010-01-24 10:08:54Z bz $"); 67 68 #include "opt_inet.h" 69 #include "opt_inet6.h" 70 #include "opt_ipsec.h" 71 #include "opt_mac.h" 72 73 #include <sys/param.h> 74 #include <sys/jail.h> 75 #include <sys/kernel.h> 76 #include <sys/lock.h> 77 #include <sys/mbuf.h> 78 #include <sys/priv.h> 79 #include <sys/proc.h> 80 #include <sys/protosw.h> 81 #include <sys/signalvar.h> 82 #include <sys/socket.h> 83 #include <sys/socketvar.h> 84 #include <sys/sx.h> 85 #include <sys/sysctl.h> 86 #include <sys/syslog.h> 87 #include <sys/systm.h> 88 89 #include <net/if.h> 90 #include <net/if_types.h> 91 #include <net/route.h> 92 93 #include <netinet/in.h> 94 #include <netinet/in_pcb.h> 95 #include <netinet/in_systm.h> 96 #include <netinet/in_var.h> 97 #include <netinet/ip.h> 98 #include <netinet/ip_icmp.h> 99 #include <netinet/ip6.h> 100 #include <netinet/icmp_var.h> 101 #include <netinet/icmp6.h> 102 #include <netinet/ip_var.h> 103 #include <netinet/udp.h> 104 #include <netinet/udp_var.h> 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 ipsec6stat.in_polvio++; 140 return; 141 } 142 #endif /* IPSEC */ 143 #ifdef MAC 144 if (mac_check_inpcb_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.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 ip6_hdr *ip6; 173 struct udphdr *uh; 174 struct inpcb *inp; 175 int off = *offp; 176 int plen, ulen; 177 struct sockaddr_in6 fromsa; 178 179 ip6 = mtod(m, struct ip6_hdr *); 180 181 if (faithprefix_p != NULL && (*faithprefix_p)(&ip6->ip6_dst)) { 182 /* XXX send icmp6 host/port unreach? */ 183 m_freem(m); 184 return (IPPROTO_DONE); 185 } 186 187 #ifndef PULLDOWN_TEST 188 IP6_EXTHDR_CHECK(m, off, sizeof(struct udphdr), IPPROTO_DONE); 189 ip6 = mtod(m, struct ip6_hdr *); 190 uh = (struct udphdr *)((caddr_t)ip6 + off); 191 #else 192 IP6_EXTHDR_GET(uh, struct udphdr *, m, off, sizeof(*uh)); 193 if (!uh) 194 return (IPPROTO_DONE); 195 #endif 196 197 udpstat.udps_ipackets++; 198 199 /* 200 * Destination port of 0 is illegal, based on RFC768. 201 */ 202 if (uh->uh_dport == 0) 203 goto badunlocked; 204 205 plen = ntohs(ip6->ip6_plen) - off + sizeof(*ip6); 206 ulen = ntohs((u_short)uh->uh_ulen); 207 208 if (plen != ulen) { 209 udpstat.udps_badlen++; 210 goto badunlocked; 211 } 212 213 /* 214 * Checksum extended UDP header and data. 215 */ 216 if (uh->uh_sum == 0) { 217 udpstat.udps_nosum++; 218 goto badunlocked; 219 } 220 if (in6_cksum(m, IPPROTO_UDP, off, ulen) != 0) { 221 udpstat.udps_badsum++; 222 goto badunlocked; 223 } 224 225 /* 226 * Construct sockaddr format source address. 227 */ 228 init_sin6(&fromsa, m); 229 fromsa.sin6_port = uh->uh_sport; 230 231 INP_INFO_RLOCK(&udbinfo); 232 if (IN6_IS_ADDR_MULTICAST(&ip6->ip6_dst)) { 233 struct inpcb *last; 234 235 /* 236 * In the event that laddr should be set to the link-local 237 * address (this happens in RIPng), the multicast address 238 * specified in the received packet will not match laddr. To 239 * handle this situation, matching is relaxed if the 240 * receiving interface is the same as one specified in the 241 * socket and if the destination multicast address matches 242 * one of the multicast groups specified in the socket. 243 */ 244 245 /* 246 * KAME note: traditionally we dropped udpiphdr from mbuf 247 * here. We need udphdr for IPsec processing so we do that 248 * later. 249 */ 250 last = NULL; 251 LIST_FOREACH(inp, &udb, inp_list) { 252 if ((inp->inp_vflag & INP_IPV6) == 0) 253 continue; 254 if (inp->inp_lport != uh->uh_dport) 255 continue; 256 /* 257 * XXX: Do not check source port of incoming datagram 258 * unless inp_connect() has been called to bind the 259 * fport part of the 4-tuple; the source could be 260 * trying to talk to us with an ephemeral port. 261 */ 262 if (inp->inp_fport != 0 && 263 inp->inp_fport != uh->uh_sport) 264 continue; 265 if (!IN6_IS_ADDR_UNSPECIFIED(&inp->in6p_laddr)) { 266 if (!IN6_ARE_ADDR_EQUAL(&inp->in6p_laddr, 267 &ip6->ip6_dst)) 268 continue; 269 } 270 if (!IN6_IS_ADDR_UNSPECIFIED(&inp->in6p_faddr)) { 271 if (!IN6_ARE_ADDR_EQUAL(&inp->in6p_faddr, 272 &ip6->ip6_src) || 273 inp->inp_fport != uh->uh_sport) 274 continue; 275 } 276 277 if (last != NULL) { 278 struct mbuf *n; 279 280 if ((n = m_copy(m, 0, M_COPYALL)) != NULL) { 281 INP_RLOCK(last); 282 udp6_append(last, n, off, &fromsa); 283 INP_RUNLOCK(last); 284 } 285 } 286 last = inp; 287 /* 288 * Don't look for additional matches if this one does 289 * not have either the SO_REUSEPORT or SO_REUSEADDR 290 * socket options set. This heuristic avoids 291 * searching through all pcbs in the common case of a 292 * non-shared port. It assumes that an application 293 * will never clear these options after setting them. 294 */ 295 if ((last->inp_socket->so_options & 296 (SO_REUSEPORT|SO_REUSEADDR)) == 0) 297 break; 298 } 299 300 if (last == NULL) { 301 /* 302 * No matching pcb found; discard datagram. (No need 303 * to send an ICMP Port Unreachable for a broadcast 304 * or multicast datgram.) 305 */ 306 udpstat.udps_noport++; 307 udpstat.udps_noportmcast++; 308 goto badheadlocked; 309 } 310 INP_RLOCK(last); 311 INP_INFO_RUNLOCK(&udbinfo); 312 udp6_append(last, m, off, &fromsa); 313 INP_RUNLOCK(last); 314 return (IPPROTO_DONE); 315 } 316 /* 317 * Locate pcb for datagram. 318 */ 319 inp = in6_pcblookup_hash(&udbinfo, &ip6->ip6_src, uh->uh_sport, 320 &ip6->ip6_dst, uh->uh_dport, 1, m->m_pkthdr.rcvif); 321 if (inp == NULL) { 322 if (udp_log_in_vain) { 323 char ip6bufs[INET6_ADDRSTRLEN]; 324 char ip6bufd[INET6_ADDRSTRLEN]; 325 326 log(LOG_INFO, 327 "Connection attempt to UDP [%s]:%d from [%s]:%d\n", 328 ip6_sprintf(ip6bufd, &ip6->ip6_dst), 329 ntohs(uh->uh_dport), 330 ip6_sprintf(ip6bufs, &ip6->ip6_src), 331 ntohs(uh->uh_sport)); 332 } 333 udpstat.udps_noport++; 334 if (m->m_flags & M_MCAST) { 335 printf("UDP6: M_MCAST is set in a unicast packet.\n"); 336 udpstat.udps_noportmcast++; 337 goto badheadlocked; 338 } 339 INP_INFO_RUNLOCK(&udbinfo); 340 if (udp_blackhole) 341 goto badunlocked; 342 if (badport_bandlim(BANDLIM_ICMP6_UNREACH) < 0) 343 goto badunlocked; 344 icmp6_error(m, ICMP6_DST_UNREACH, ICMP6_DST_UNREACH_NOPORT, 0); 345 return (IPPROTO_DONE); 346 } 347 INP_RLOCK(inp); 348 INP_INFO_RUNLOCK(&udbinfo); 349 udp6_append(inp, m, off, &fromsa); 350 INP_RUNLOCK(inp); 351 return (IPPROTO_DONE); 352 353 badheadlocked: 354 INP_INFO_RUNLOCK(&udbinfo); 355 badunlocked: 356 if (m) 357 m_freem(m); 358 return (IPPROTO_DONE); 359 } 360 361 void 362 udp6_ctlinput(int cmd, struct sockaddr *sa, void *d) 363 { 364 struct udphdr uh; 365 struct ip6_hdr *ip6; 366 struct mbuf *m; 367 int off = 0; 368 struct ip6ctlparam *ip6cp = NULL; 369 const struct sockaddr_in6 *sa6_src = NULL; 370 void *cmdarg; 371 struct inpcb *(*notify)(struct inpcb *, int) = udp_notify; 372 struct udp_portonly { 373 u_int16_t uh_sport; 374 u_int16_t uh_dport; 375 } *uhp; 376 377 if (sa->sa_family != AF_INET6 || 378 sa->sa_len != sizeof(struct sockaddr_in6)) 379 return; 380 381 if ((unsigned)cmd >= PRC_NCMDS) 382 return; 383 if (PRC_IS_REDIRECT(cmd)) 384 notify = in6_rtchange, d = NULL; 385 else if (cmd == PRC_HOSTDEAD) 386 d = NULL; 387 else if (inet6ctlerrmap[cmd] == 0) 388 return; 389 390 /* if the parameter is from icmp6, decode it. */ 391 if (d != NULL) { 392 ip6cp = (struct ip6ctlparam *)d; 393 m = ip6cp->ip6c_m; 394 ip6 = ip6cp->ip6c_ip6; 395 off = ip6cp->ip6c_off; 396 cmdarg = ip6cp->ip6c_cmdarg; 397 sa6_src = ip6cp->ip6c_src; 398 } else { 399 m = NULL; 400 ip6 = NULL; 401 cmdarg = NULL; 402 sa6_src = &sa6_any; 403 } 404 405 if (ip6) { 406 /* 407 * XXX: We assume that when IPV6 is non NULL, 408 * M and OFF are valid. 409 */ 410 411 /* Check if we can safely examine src and dst ports. */ 412 if (m->m_pkthdr.len < off + sizeof(*uhp)) 413 return; 414 415 bzero(&uh, sizeof(uh)); 416 m_copydata(m, off, sizeof(*uhp), (caddr_t)&uh); 417 418 (void) in6_pcbnotify(&udbinfo, sa, uh.uh_dport, 419 (struct sockaddr *)ip6cp->ip6c_src, uh.uh_sport, cmd, 420 cmdarg, notify); 421 } else 422 (void) in6_pcbnotify(&udbinfo, sa, 0, 423 (const struct sockaddr *)sa6_src, 0, cmd, cmdarg, notify); 424 } 425 426 static int 427 udp6_getcred(SYSCTL_HANDLER_ARGS) 428 { 429 struct xucred xuc; 430 struct sockaddr_in6 addrs[2]; 431 struct inpcb *inp; 432 int error; 433 434 error = priv_check(req->td, PRIV_NETINET_GETCRED); 435 if (error) 436 return (error); 437 438 if (req->newlen != sizeof(addrs)) 439 return (EINVAL); 440 if (req->oldlen != sizeof(struct xucred)) 441 return (EINVAL); 442 error = SYSCTL_IN(req, addrs, sizeof(addrs)); 443 if (error) 444 return (error); 445 if ((error = sa6_embedscope(&addrs[0], ip6_use_defzone)) != 0 || 446 (error = sa6_embedscope(&addrs[1], ip6_use_defzone)) != 0) { 447 return (error); 448 } 449 INP_INFO_RLOCK(&udbinfo); 450 inp = in6_pcblookup_hash(&udbinfo, &addrs[1].sin6_addr, 451 addrs[1].sin6_port, &addrs[0].sin6_addr, addrs[0].sin6_port, 1, 452 NULL); 453 if (inp != NULL) { 454 INP_RLOCK(inp); 455 INP_INFO_RUNLOCK(&udbinfo); 456 if (inp->inp_socket == NULL) 457 error = ENOENT; 458 if (error == 0) 459 error = cr_canseesocket(req->td->td_ucred, 460 inp->inp_socket); 461 if (error == 0) 462 cru2x(inp->inp_cred, &xuc); 463 INP_RUNLOCK(inp); 464 } else { 465 INP_INFO_RUNLOCK(&udbinfo); 466 error = ENOENT; 467 } 468 if (error == 0) 469 error = SYSCTL_OUT(req, &xuc, sizeof(struct xucred)); 470 return (error); 471 } 472 473 SYSCTL_PROC(_net_inet6_udp6, OID_AUTO, getcred, CTLTYPE_OPAQUE|CTLFLAG_RW, 0, 474 0, udp6_getcred, "S,xucred", "Get the xucred of a UDP6 connection"); 475 476 static int 477 udp6_output(struct inpcb *inp, struct mbuf *m, struct sockaddr *addr6, 478 struct mbuf *control, struct thread *td) 479 { 480 u_int32_t ulen = m->m_pkthdr.len; 481 u_int32_t plen = sizeof(struct udphdr) + ulen; 482 struct ip6_hdr *ip6; 483 struct udphdr *udp6; 484 struct in6_addr *laddr, *faddr, in6a; 485 struct sockaddr_in6 *sin6 = NULL; 486 struct ifnet *oifp = NULL; 487 int scope_ambiguous = 0; 488 u_short fport; 489 int error = 0; 490 struct ip6_pktopts *optp, opt; 491 int af = AF_INET6, hlen = sizeof(struct ip6_hdr); 492 int flags; 493 struct sockaddr_in6 tmp; 494 495 INP_WLOCK_ASSERT(inp); 496 497 if (addr6) { 498 /* addr6 has been validated in udp6_send(). */ 499 sin6 = (struct sockaddr_in6 *)addr6; 500 501 /* protect *sin6 from overwrites */ 502 tmp = *sin6; 503 sin6 = &tmp; 504 505 /* 506 * Application should provide a proper zone ID or the use of 507 * default zone IDs should be enabled. Unfortunately, some 508 * applications do not behave as it should, so we need a 509 * workaround. Even if an appropriate ID is not determined, 510 * we'll see if we can determine the outgoing interface. If we 511 * can, determine the zone ID based on the interface below. 512 */ 513 if (sin6->sin6_scope_id == 0 && !ip6_use_defzone) 514 scope_ambiguous = 1; 515 if ((error = sa6_embedscope(sin6, ip6_use_defzone)) != 0) 516 return (error); 517 } 518 519 if (control) { 520 if ((error = ip6_setpktopts(control, &opt, 521 inp->in6p_outputopts, td->td_ucred, IPPROTO_UDP)) != 0) 522 goto release; 523 optp = &opt; 524 } else 525 optp = inp->in6p_outputopts; 526 527 if (sin6) { 528 faddr = &sin6->sin6_addr; 529 530 /* 531 * IPv4 version of udp_output calls in_pcbconnect in this case, 532 * which needs splnet and affects performance. 533 * Since we saw no essential reason for calling in_pcbconnect, 534 * we get rid of such kind of logic, and call in6_selectsrc 535 * and in6_pcbsetport in order to fill in the local address 536 * and the local port. 537 */ 538 if (sin6->sin6_port == 0) { 539 error = EADDRNOTAVAIL; 540 goto release; 541 } 542 543 if (!IN6_IS_ADDR_UNSPECIFIED(&inp->in6p_faddr)) { 544 /* how about ::ffff:0.0.0.0 case? */ 545 error = EISCONN; 546 goto release; 547 } 548 549 fport = sin6->sin6_port; /* allow 0 port */ 550 551 if (IN6_IS_ADDR_V4MAPPED(faddr)) { 552 if ((inp->inp_flags & IN6P_IPV6_V6ONLY)) { 553 /* 554 * I believe we should explicitly discard the 555 * packet when mapped addresses are disabled, 556 * rather than send the packet as an IPv6 one. 557 * If we chose the latter approach, the packet 558 * might be sent out on the wire based on the 559 * default route, the situation which we'd 560 * probably want to avoid. 561 * (20010421 jinmei@kame.net) 562 */ 563 error = EINVAL; 564 goto release; 565 } 566 if (!IN6_IS_ADDR_UNSPECIFIED(&inp->in6p_laddr) && 567 !IN6_IS_ADDR_V4MAPPED(&inp->in6p_laddr)) { 568 /* 569 * when remote addr is an IPv4-mapped address, 570 * local addr should not be an IPv6 address, 571 * since you cannot determine how to map IPv6 572 * source address to IPv4. 573 */ 574 error = EINVAL; 575 goto release; 576 } 577 578 af = AF_INET; 579 } 580 581 if (!IN6_IS_ADDR_V4MAPPED(faddr)) { 582 error = in6_selectsrc(sin6, optp, inp, NULL, 583 td->td_ucred, &oifp, &in6a); 584 if (error) 585 goto release; 586 if (oifp && scope_ambiguous && 587 (error = in6_setscope(&sin6->sin6_addr, 588 oifp, NULL))) { 589 goto release; 590 } 591 laddr = &in6a; 592 } else 593 laddr = &inp->in6p_laddr; /* XXX */ 594 if (laddr == NULL) { 595 if (error == 0) 596 error = EADDRNOTAVAIL; 597 goto release; 598 } 599 if (inp->inp_lport == 0 && 600 (error = in6_pcbsetport(laddr, inp, td->td_ucred)) != 0) 601 goto release; 602 } else { 603 if (IN6_IS_ADDR_UNSPECIFIED(&inp->in6p_faddr)) { 604 error = ENOTCONN; 605 goto release; 606 } 607 if (IN6_IS_ADDR_V4MAPPED(&inp->in6p_faddr)) { 608 if ((inp->inp_flags & IN6P_IPV6_V6ONLY)) { 609 /* 610 * XXX: this case would happen when the 611 * application sets the V6ONLY flag after 612 * connecting the foreign address. 613 * Such applications should be fixed, 614 * so we bark here. 615 */ 616 log(LOG_INFO, "udp6_output: IPV6_V6ONLY " 617 "option was set for a connected socket\n"); 618 error = EINVAL; 619 goto release; 620 } else 621 af = AF_INET; 622 } 623 laddr = &inp->in6p_laddr; 624 faddr = &inp->in6p_faddr; 625 fport = inp->inp_fport; 626 } 627 628 if (af == AF_INET) 629 hlen = sizeof(struct ip); 630 631 /* 632 * Calculate data length and get a mbuf 633 * for UDP and IP6 headers. 634 */ 635 M_PREPEND(m, hlen + sizeof(struct udphdr), M_DONTWAIT); 636 if (m == 0) { 637 error = ENOBUFS; 638 goto release; 639 } 640 641 /* 642 * Stuff checksum and output datagram. 643 */ 644 udp6 = (struct udphdr *)(mtod(m, caddr_t) + hlen); 645 udp6->uh_sport = inp->inp_lport; /* lport is always set in the PCB */ 646 udp6->uh_dport = fport; 647 if (plen <= 0xffff) 648 udp6->uh_ulen = htons((u_short)plen); 649 else 650 udp6->uh_ulen = 0; 651 udp6->uh_sum = 0; 652 653 switch (af) { 654 case AF_INET6: 655 ip6 = mtod(m, struct ip6_hdr *); 656 ip6->ip6_flow = inp->inp_flow & IPV6_FLOWINFO_MASK; 657 ip6->ip6_vfc &= ~IPV6_VERSION_MASK; 658 ip6->ip6_vfc |= IPV6_VERSION; 659 #if 0 /* ip6_plen will be filled in ip6_output. */ 660 ip6->ip6_plen = htons((u_short)plen); 661 #endif 662 ip6->ip6_nxt = IPPROTO_UDP; 663 ip6->ip6_hlim = in6_selecthlim(inp, NULL); 664 ip6->ip6_src = *laddr; 665 ip6->ip6_dst = *faddr; 666 667 if ((udp6->uh_sum = in6_cksum(m, IPPROTO_UDP, 668 sizeof(struct ip6_hdr), plen)) == 0) { 669 udp6->uh_sum = 0xffff; 670 } 671 672 flags = 0; 673 674 udpstat.udps_opackets++; 675 error = ip6_output(m, optp, NULL, flags, inp->in6p_moptions, 676 NULL, inp); 677 break; 678 case AF_INET: 679 error = EAFNOSUPPORT; 680 goto release; 681 } 682 goto releaseopt; 683 684 release: 685 m_freem(m); 686 687 releaseopt: 688 if (control) { 689 ip6_clearpktopts(&opt, -1); 690 m_freem(control); 691 } 692 return (error); 693 } 694 695 static void 696 udp6_abort(struct socket *so) 697 { 698 struct inpcb *inp; 699 700 inp = sotoinpcb(so); 701 KASSERT(inp != NULL, ("udp6_abort: inp == NULL")); 702 703 #ifdef INET 704 if (inp->inp_vflag & INP_IPV4) { 705 struct pr_usrreqs *pru; 706 707 pru = inetsw[ip_protox[IPPROTO_UDP]].pr_usrreqs; 708 (*pru->pru_abort)(so); 709 return; 710 } 711 #endif 712 713 INP_INFO_WLOCK(&udbinfo); 714 INP_WLOCK(inp); 715 if (!IN6_IS_ADDR_UNSPECIFIED(&inp->in6p_faddr)) { 716 in6_pcbdisconnect(inp); 717 inp->in6p_laddr = in6addr_any; 718 soisdisconnected(so); 719 } 720 INP_WUNLOCK(inp); 721 INP_INFO_WUNLOCK(&udbinfo); 722 } 723 724 static int 725 udp6_attach(struct socket *so, int proto, struct thread *td) 726 { 727 struct inpcb *inp; 728 int error; 729 730 inp = sotoinpcb(so); 731 KASSERT(inp == NULL, ("udp6_attach: inp != NULL")); 732 733 if (so->so_snd.sb_hiwat == 0 || so->so_rcv.sb_hiwat == 0) { 734 error = soreserve(so, udp_sendspace, udp_recvspace); 735 if (error) 736 return (error); 737 } 738 INP_INFO_WLOCK(&udbinfo); 739 error = in_pcballoc(so, &udbinfo); 740 if (error) { 741 INP_INFO_WUNLOCK(&udbinfo); 742 return (error); 743 } 744 inp = (struct inpcb *)so->so_pcb; 745 inp->inp_vflag |= INP_IPV6; 746 if ((inp->inp_flags & IN6P_IPV6_V6ONLY) == 0) 747 inp->inp_vflag |= INP_IPV4; 748 inp->in6p_hops = -1; /* use kernel default */ 749 inp->in6p_cksum = -1; /* just to be sure */ 750 /* 751 * XXX: ugly!! 752 * IPv4 TTL initialization is necessary for an IPv6 socket as well, 753 * because the socket may be bound to an IPv6 wildcard address, 754 * which may match an IPv4-mapped IPv6 address. 755 */ 756 inp->inp_ip_ttl = ip_defttl; 757 758 error = udp_newudpcb(inp); 759 if (error) { 760 in_pcbdetach(inp); 761 in_pcbfree(inp); 762 INP_INFO_WUNLOCK(&udbinfo); 763 return (error); 764 } 765 INP_WUNLOCK(inp); 766 INP_INFO_WUNLOCK(&udbinfo); 767 return (0); 768 } 769 770 static int 771 udp6_bind(struct socket *so, struct sockaddr *nam, struct thread *td) 772 { 773 struct inpcb *inp; 774 int error; 775 776 inp = sotoinpcb(so); 777 KASSERT(inp != NULL, ("udp6_bind: inp == NULL")); 778 779 INP_INFO_WLOCK(&udbinfo); 780 INP_WLOCK(inp); 781 inp->inp_vflag &= ~INP_IPV4; 782 inp->inp_vflag |= INP_IPV6; 783 if ((inp->inp_flags & IN6P_IPV6_V6ONLY) == 0) { 784 struct sockaddr_in6 *sin6_p; 785 786 sin6_p = (struct sockaddr_in6 *)nam; 787 788 if (IN6_IS_ADDR_UNSPECIFIED(&sin6_p->sin6_addr)) 789 inp->inp_vflag |= INP_IPV4; 790 else if (IN6_IS_ADDR_V4MAPPED(&sin6_p->sin6_addr)) { 791 struct sockaddr_in sin; 792 793 in6_sin6_2_sin(&sin, sin6_p); 794 inp->inp_vflag |= INP_IPV4; 795 inp->inp_vflag &= ~INP_IPV6; 796 error = in_pcbbind(inp, (struct sockaddr *)&sin, 797 td->td_ucred); 798 goto out; 799 } 800 } 801 802 error = in6_pcbbind(inp, nam, td->td_ucred); 803 out: 804 INP_WUNLOCK(inp); 805 INP_INFO_WUNLOCK(&udbinfo); 806 return (error); 807 } 808 809 static void 810 udp6_close(struct socket *so) 811 { 812 struct inpcb *inp; 813 814 inp = sotoinpcb(so); 815 KASSERT(inp != NULL, ("udp6_close: inp == NULL")); 816 817 #ifdef INET 818 if (inp->inp_vflag & INP_IPV4) { 819 struct pr_usrreqs *pru; 820 821 pru = inetsw[ip_protox[IPPROTO_UDP]].pr_usrreqs; 822 (*pru->pru_disconnect)(so); 823 return; 824 } 825 #endif 826 INP_INFO_WLOCK(&udbinfo); 827 INP_WLOCK(inp); 828 if (!IN6_IS_ADDR_UNSPECIFIED(&inp->in6p_faddr)) { 829 in6_pcbdisconnect(inp); 830 inp->in6p_laddr = in6addr_any; 831 soisdisconnected(so); 832 } 833 INP_WUNLOCK(inp); 834 INP_INFO_WUNLOCK(&udbinfo); 835 } 836 837 static int 838 udp6_connect(struct socket *so, struct sockaddr *nam, struct thread *td) 839 { 840 struct inpcb *inp; 841 struct sockaddr_in6 *sin6; 842 int error; 843 844 inp = sotoinpcb(so); 845 sin6 = (struct sockaddr_in6 *)nam; 846 KASSERT(inp != NULL, ("udp6_connect: inp == NULL")); 847 848 INP_INFO_WLOCK(&udbinfo); 849 INP_WLOCK(inp); 850 if ((inp->inp_flags & IN6P_IPV6_V6ONLY) == 0 && 851 IN6_IS_ADDR_V4MAPPED(&sin6->sin6_addr)) { 852 struct sockaddr_in sin; 853 854 if (inp->inp_faddr.s_addr != INADDR_ANY) { 855 error = EISCONN; 856 goto out; 857 } 858 in6_sin6_2_sin(&sin, sin6); 859 error = prison_remote_ip4(td->td_ucred, &sin.sin_addr); 860 if (error != 0) 861 goto out; 862 error = in_pcbconnect(inp, (struct sockaddr *)&sin, 863 td->td_ucred); 864 if (error == 0) { 865 inp->inp_vflag |= INP_IPV4; 866 inp->inp_vflag &= ~INP_IPV6; 867 soisconnected(so); 868 } 869 goto out; 870 } 871 if (!IN6_IS_ADDR_UNSPECIFIED(&inp->in6p_faddr)) { 872 error = EISCONN; 873 goto out; 874 } 875 error = prison_remote_ip6(td->td_ucred, &sin6->sin6_addr); 876 if (error != 0) 877 goto out; 878 error = in6_pcbconnect(inp, nam, td->td_ucred); 879 if (error == 0) { 880 if ((inp->inp_flags & IN6P_IPV6_V6ONLY) == 0) { 881 /* should be non mapped addr */ 882 inp->inp_vflag &= ~INP_IPV4; 883 inp->inp_vflag |= INP_IPV6; 884 } 885 soisconnected(so); 886 } 887 out: 888 INP_WUNLOCK(inp); 889 INP_INFO_WUNLOCK(&udbinfo); 890 return (error); 891 } 892 893 static void 894 udp6_detach(struct socket *so) 895 { 896 struct inpcb *inp; 897 struct udpcb *up; 898 899 inp = sotoinpcb(so); 900 KASSERT(inp != NULL, ("udp6_detach: inp == NULL")); 901 902 INP_INFO_WLOCK(&udbinfo); 903 INP_WLOCK(inp); 904 up = intoudpcb(inp); 905 KASSERT(up != NULL, ("%s: up == NULL", __func__)); 906 in_pcbdetach(inp); 907 in_pcbfree(inp); 908 INP_INFO_WUNLOCK(&udbinfo); 909 udp_discardcb(up); 910 } 911 912 static int 913 udp6_disconnect(struct socket *so) 914 { 915 struct inpcb *inp; 916 int error; 917 918 inp = sotoinpcb(so); 919 KASSERT(inp != NULL, ("udp6_disconnect: inp == NULL")); 920 921 INP_INFO_WLOCK(&udbinfo); 922 INP_WLOCK(inp); 923 924 #ifdef INET 925 if (inp->inp_vflag & INP_IPV4) { 926 struct pr_usrreqs *pru; 927 928 pru = inetsw[ip_protox[IPPROTO_UDP]].pr_usrreqs; 929 error = (*pru->pru_disconnect)(so); 930 goto out; 931 } 932 #endif 933 934 if (IN6_IS_ADDR_UNSPECIFIED(&inp->in6p_faddr)) { 935 error = ENOTCONN; 936 goto out; 937 } 938 939 in6_pcbdisconnect(inp); 940 inp->in6p_laddr = in6addr_any; 941 SOCK_LOCK(so); 942 so->so_state &= ~SS_ISCONNECTED; /* XXX */ 943 SOCK_UNLOCK(so); 944 out: 945 INP_WUNLOCK(inp); 946 INP_INFO_WUNLOCK(&udbinfo); 947 return (0); 948 } 949 950 static int 951 udp6_send(struct socket *so, int flags, struct mbuf *m, 952 struct sockaddr *addr, struct mbuf *control, struct thread *td) 953 { 954 struct inpcb *inp; 955 int error = 0; 956 957 inp = sotoinpcb(so); 958 KASSERT(inp != NULL, ("udp6_send: inp == NULL")); 959 960 INP_INFO_WLOCK(&udbinfo); 961 INP_WLOCK(inp); 962 if (addr) { 963 if (addr->sa_len != sizeof(struct sockaddr_in6)) { 964 error = EINVAL; 965 goto bad; 966 } 967 if (addr->sa_family != AF_INET6) { 968 error = EAFNOSUPPORT; 969 goto bad; 970 } 971 } 972 973 #ifdef INET 974 if ((inp->inp_flags & IN6P_IPV6_V6ONLY) == 0) { 975 int hasv4addr; 976 struct sockaddr_in6 *sin6 = 0; 977 978 if (addr == 0) 979 hasv4addr = (inp->inp_vflag & INP_IPV4); 980 else { 981 sin6 = (struct sockaddr_in6 *)addr; 982 hasv4addr = IN6_IS_ADDR_V4MAPPED(&sin6->sin6_addr) 983 ? 1 : 0; 984 } 985 if (hasv4addr) { 986 struct pr_usrreqs *pru; 987 988 if (!IN6_IS_ADDR_UNSPECIFIED(&inp->in6p_laddr) && 989 !IN6_IS_ADDR_V4MAPPED(&inp->in6p_laddr)) { 990 /* 991 * When remote addr is IPv4-mapped address, 992 * local addr should not be an IPv6 address; 993 * since you cannot determine how to map IPv6 994 * source address to IPv4. 995 */ 996 error = EINVAL; 997 goto out; 998 } 999 1000 /* 1001 * XXXRW: We release UDP-layer locks before calling 1002 * udp_send() in order to avoid recursion. However, 1003 * this does mean there is a short window where inp's 1004 * fields are unstable. Could this lead to a 1005 * potential race in which the factors causing us to 1006 * select the UDPv4 output routine are invalidated? 1007 */ 1008 INP_WUNLOCK(inp); 1009 INP_INFO_WUNLOCK(&udbinfo); 1010 if (sin6) 1011 in6_sin6_2_sin_in_sock(addr); 1012 pru = inetsw[ip_protox[IPPROTO_UDP]].pr_usrreqs; 1013 /* addr will just be freed in sendit(). */ 1014 return ((*pru->pru_send)(so, flags, m, addr, control, 1015 td)); 1016 } 1017 } 1018 #endif 1019 #ifdef MAC 1020 mac_create_mbuf_from_inpcb(inp, m); 1021 #endif 1022 error = udp6_output(inp, m, addr, control, td); 1023 out: 1024 INP_WUNLOCK(inp); 1025 INP_INFO_WUNLOCK(&udbinfo); 1026 return (error); 1027 1028 bad: 1029 INP_WUNLOCK(inp); 1030 INP_INFO_WUNLOCK(&udbinfo); 1031 m_freem(m); 1032 return (error); 1033 } 1034 1035 struct pr_usrreqs udp6_usrreqs = { 1036 .pru_abort = udp6_abort, 1037 .pru_attach = udp6_attach, 1038 .pru_bind = udp6_bind, 1039 .pru_connect = udp6_connect, 1040 .pru_control = in6_control, 1041 .pru_detach = udp6_detach, 1042 .pru_disconnect = udp6_disconnect, 1043 .pru_peeraddr = in6_mapped_peeraddr, 1044 .pru_send = udp6_send, 1045 .pru_shutdown = udp_shutdown, 1046 .pru_sockaddr = in6_mapped_sockaddr, 1047 .pru_sosend = sosend_dgram, 1048 .pru_sosetlabel = in_pcbsosetlabel, 1049 .pru_close = udp6_close 1050 };
Cache object: 6ba54ecf7e3c681b33dc6c5d73ca5120
[ source navigation ] [ diff markup ] [ identifier search ] [ freetext search ] [ file search ] [ list types ] [ track identifier ]