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sys/netinet6/udp6_usrreq.c
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1 /*- 2 * Copyright (C) 1995, 1996, 1997, and 1998 WIDE Project. 3 * Copyright (c) 2010-2011 Juniper Networks, Inc. 4 * Copyright (c) 2014 Kevin Lo 5 * All rights reserved. 6 * 7 * Portions of this software were developed by Robert N. M. Watson under 8 * contract to Juniper Networks, Inc. 9 * 10 * Redistribution and use in source and binary forms, with or without 11 * modification, are permitted provided that the following conditions 12 * are met: 13 * 1. Redistributions of source code must retain the above copyright 14 * notice, this list of conditions and the following disclaimer. 15 * 2. Redistributions in binary form must reproduce the above copyright 16 * notice, this list of conditions and the following disclaimer in the 17 * documentation and/or other materials provided with the distribution. 18 * 3. Neither the name of the project nor the names of its contributors 19 * may be used to endorse or promote products derived from this software 20 * without specific prior written permission. 21 * 22 * THIS SOFTWARE IS PROVIDED BY THE PROJECT AND CONTRIBUTORS ``AS IS'' AND 23 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 24 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 25 * ARE DISCLAIMED. IN NO EVENT SHALL THE PROJECT OR CONTRIBUTORS BE LIABLE 26 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 27 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 28 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 29 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 30 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 31 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 32 * SUCH DAMAGE. 33 * 34 * $KAME: udp6_usrreq.c,v 1.27 2001/05/21 05:45:10 jinmei Exp $ 35 * $KAME: udp6_output.c,v 1.31 2001/05/21 16:39:15 jinmei Exp $ 36 */ 37 38 /*- 39 * Copyright (c) 1982, 1986, 1988, 1990, 1993, 1995 40 * The Regents of the University of California. 41 * All rights reserved. 42 * 43 * Redistribution and use in source and binary forms, with or without 44 * modification, are permitted provided that the following conditions 45 * are met: 46 * 1. Redistributions of source code must retain the above copyright 47 * notice, this list of conditions and the following disclaimer. 48 * 2. Redistributions in binary form must reproduce the above copyright 49 * notice, this list of conditions and the following disclaimer in the 50 * documentation and/or other materials provided with the distribution. 51 * 4. Neither the name of the University nor the names of its contributors 52 * may be used to endorse or promote products derived from this software 53 * without specific prior written permission. 54 * 55 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND 56 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 57 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 58 * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE 59 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 60 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 61 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 62 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 63 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 64 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 65 * SUCH DAMAGE. 66 * 67 * @(#)udp_usrreq.c 8.6 (Berkeley) 5/23/95 68 */ 69 70 #include <sys/cdefs.h> 71 __FBSDID("$FreeBSD: releng/10.1/sys/netinet6/udp6_usrreq.c 272991 2014-10-12 17:07:15Z tuexen $"); 72 73 #include "opt_inet.h" 74 #include "opt_inet6.h" 75 #include "opt_ipfw.h" 76 #include "opt_ipsec.h" 77 #include "opt_kdtrace.h" 78 79 #include <sys/param.h> 80 #include <sys/jail.h> 81 #include <sys/kernel.h> 82 #include <sys/lock.h> 83 #include <sys/mbuf.h> 84 #include <sys/priv.h> 85 #include <sys/proc.h> 86 #include <sys/protosw.h> 87 #include <sys/sdt.h> 88 #include <sys/signalvar.h> 89 #include <sys/socket.h> 90 #include <sys/socketvar.h> 91 #include <sys/sx.h> 92 #include <sys/sysctl.h> 93 #include <sys/syslog.h> 94 #include <sys/systm.h> 95 96 #include <net/if.h> 97 #include <net/if_types.h> 98 #include <net/route.h> 99 100 #include <netinet/in.h> 101 #include <netinet/in_kdtrace.h> 102 #include <netinet/in_pcb.h> 103 #include <netinet/in_systm.h> 104 #include <netinet/in_var.h> 105 #include <netinet/ip.h> 106 #include <netinet/ip_icmp.h> 107 #include <netinet/ip6.h> 108 #include <netinet/icmp_var.h> 109 #include <netinet/icmp6.h> 110 #include <netinet/ip_var.h> 111 #include <netinet/udp.h> 112 #include <netinet/udp_var.h> 113 #include <netinet/udplite.h> 114 115 #include <netinet6/ip6protosw.h> 116 #include <netinet6/ip6_var.h> 117 #include <netinet6/in6_pcb.h> 118 #include <netinet6/udp6_var.h> 119 #include <netinet6/scope6_var.h> 120 121 #ifdef IPSEC 122 #include <netipsec/ipsec.h> 123 #include <netipsec/ipsec6.h> 124 #endif /* IPSEC */ 125 126 #include <security/mac/mac_framework.h> 127 128 /* 129 * UDP protocol implementation. 130 * Per RFC 768, August, 1980. 131 */ 132 133 extern struct protosw inetsw[]; 134 static void udp6_detach(struct socket *so); 135 136 static void 137 udp6_append(struct inpcb *inp, struct mbuf *n, int off, 138 struct sockaddr_in6 *fromsa) 139 { 140 struct socket *so; 141 struct mbuf *opts; 142 143 INP_LOCK_ASSERT(inp); 144 145 #ifdef IPSEC 146 /* Check AH/ESP integrity. */ 147 if (ipsec6_in_reject(n, inp)) { 148 m_freem(n); 149 IPSEC6STAT_INC(ips_in_polvio); 150 return; 151 } 152 #endif /* IPSEC */ 153 #ifdef MAC 154 if (mac_inpcb_check_deliver(inp, n) != 0) { 155 m_freem(n); 156 return; 157 } 158 #endif 159 opts = NULL; 160 if (inp->inp_flags & INP_CONTROLOPTS || 161 inp->inp_socket->so_options & SO_TIMESTAMP) 162 ip6_savecontrol(inp, n, &opts); 163 m_adj(n, off + sizeof(struct udphdr)); 164 165 so = inp->inp_socket; 166 SOCKBUF_LOCK(&so->so_rcv); 167 if (sbappendaddr_locked(&so->so_rcv, (struct sockaddr *)fromsa, n, 168 opts) == 0) { 169 SOCKBUF_UNLOCK(&so->so_rcv); 170 m_freem(n); 171 if (opts) 172 m_freem(opts); 173 UDPSTAT_INC(udps_fullsock); 174 } else 175 sorwakeup_locked(so); 176 } 177 178 int 179 udp6_input(struct mbuf **mp, int *offp, int proto) 180 { 181 struct mbuf *m = *mp; 182 struct ifnet *ifp; 183 struct ip6_hdr *ip6; 184 struct udphdr *uh; 185 struct inpcb *inp; 186 struct inpcbinfo *pcbinfo; 187 struct udpcb *up; 188 int off = *offp; 189 int cscov_partial; 190 int plen, ulen; 191 struct sockaddr_in6 fromsa; 192 struct m_tag *fwd_tag; 193 uint16_t uh_sum; 194 uint8_t nxt; 195 196 ifp = m->m_pkthdr.rcvif; 197 ip6 = mtod(m, struct ip6_hdr *); 198 199 if (faithprefix_p != NULL && (*faithprefix_p)(&ip6->ip6_dst)) { 200 /* XXX send icmp6 host/port unreach? */ 201 m_freem(m); 202 return (IPPROTO_DONE); 203 } 204 205 #ifndef PULLDOWN_TEST 206 IP6_EXTHDR_CHECK(m, off, sizeof(struct udphdr), IPPROTO_DONE); 207 ip6 = mtod(m, struct ip6_hdr *); 208 uh = (struct udphdr *)((caddr_t)ip6 + off); 209 #else 210 IP6_EXTHDR_GET(uh, struct udphdr *, m, off, sizeof(*uh)); 211 if (!uh) 212 return (IPPROTO_DONE); 213 #endif 214 215 UDPSTAT_INC(udps_ipackets); 216 217 /* 218 * Destination port of 0 is illegal, based on RFC768. 219 */ 220 if (uh->uh_dport == 0) 221 goto badunlocked; 222 223 plen = ntohs(ip6->ip6_plen) - off + sizeof(*ip6); 224 ulen = ntohs((u_short)uh->uh_ulen); 225 226 nxt = ip6->ip6_nxt; 227 cscov_partial = (nxt == IPPROTO_UDPLITE) ? 1 : 0; 228 if (nxt == IPPROTO_UDPLITE) { 229 /* Zero means checksum over the complete packet. */ 230 if (ulen == 0) 231 ulen = plen; 232 if (ulen == plen) 233 cscov_partial = 0; 234 if ((ulen < sizeof(struct udphdr)) || (ulen > plen)) { 235 /* XXX: What is the right UDPLite MIB counter? */ 236 goto badunlocked; 237 } 238 if (uh->uh_sum == 0) { 239 /* XXX: What is the right UDPLite MIB counter? */ 240 goto badunlocked; 241 } 242 } else { 243 if ((ulen < sizeof(struct udphdr)) || (plen != ulen)) { 244 UDPSTAT_INC(udps_badlen); 245 goto badunlocked; 246 } 247 if (uh->uh_sum == 0) { 248 UDPSTAT_INC(udps_nosum); 249 goto badunlocked; 250 } 251 } 252 253 if ((m->m_pkthdr.csum_flags & CSUM_DATA_VALID_IPV6) && 254 !cscov_partial) { 255 if (m->m_pkthdr.csum_flags & CSUM_PSEUDO_HDR) 256 uh_sum = m->m_pkthdr.csum_data; 257 else 258 uh_sum = in6_cksum_pseudo(ip6, ulen, nxt, 259 m->m_pkthdr.csum_data); 260 uh_sum ^= 0xffff; 261 } else 262 uh_sum = in6_cksum_partial(m, nxt, off, plen, ulen); 263 264 if (uh_sum != 0) { 265 UDPSTAT_INC(udps_badsum); 266 goto badunlocked; 267 } 268 269 /* 270 * Construct sockaddr format source address. 271 */ 272 init_sin6(&fromsa, m); 273 fromsa.sin6_port = uh->uh_sport; 274 275 pcbinfo = get_inpcbinfo(nxt); 276 if (IN6_IS_ADDR_MULTICAST(&ip6->ip6_dst)) { 277 struct inpcb *last; 278 struct inpcbhead *pcblist; 279 struct ip6_moptions *imo; 280 281 INP_INFO_RLOCK(pcbinfo); 282 /* 283 * In the event that laddr should be set to the link-local 284 * address (this happens in RIPng), the multicast address 285 * specified in the received packet will not match laddr. To 286 * handle this situation, matching is relaxed if the 287 * receiving interface is the same as one specified in the 288 * socket and if the destination multicast address matches 289 * one of the multicast groups specified in the socket. 290 */ 291 292 /* 293 * KAME note: traditionally we dropped udpiphdr from mbuf 294 * here. We need udphdr for IPsec processing so we do that 295 * later. 296 */ 297 pcblist = get_pcblist(nxt); 298 last = NULL; 299 LIST_FOREACH(inp, pcblist, inp_list) { 300 if ((inp->inp_vflag & INP_IPV6) == 0) 301 continue; 302 if (inp->inp_lport != uh->uh_dport) 303 continue; 304 if (inp->inp_fport != 0 && 305 inp->inp_fport != uh->uh_sport) 306 continue; 307 if (!IN6_IS_ADDR_UNSPECIFIED(&inp->in6p_laddr)) { 308 if (!IN6_ARE_ADDR_EQUAL(&inp->in6p_laddr, 309 &ip6->ip6_dst)) 310 continue; 311 } 312 if (!IN6_IS_ADDR_UNSPECIFIED(&inp->in6p_faddr)) { 313 if (!IN6_ARE_ADDR_EQUAL(&inp->in6p_faddr, 314 &ip6->ip6_src) || 315 inp->inp_fport != uh->uh_sport) 316 continue; 317 } 318 319 /* 320 * XXXRW: Because we weren't holding either the inpcb 321 * or the hash lock when we checked for a match 322 * before, we should probably recheck now that the 323 * inpcb lock is (supposed to be) held. 324 */ 325 326 /* 327 * Handle socket delivery policy for any-source 328 * and source-specific multicast. [RFC3678] 329 */ 330 imo = inp->in6p_moptions; 331 if (imo && IN6_IS_ADDR_MULTICAST(&ip6->ip6_dst)) { 332 struct sockaddr_in6 mcaddr; 333 int blocked; 334 335 INP_RLOCK(inp); 336 337 bzero(&mcaddr, sizeof(struct sockaddr_in6)); 338 mcaddr.sin6_len = sizeof(struct sockaddr_in6); 339 mcaddr.sin6_family = AF_INET6; 340 mcaddr.sin6_addr = ip6->ip6_dst; 341 342 blocked = im6o_mc_filter(imo, ifp, 343 (struct sockaddr *)&mcaddr, 344 (struct sockaddr *)&fromsa); 345 if (blocked != MCAST_PASS) { 346 if (blocked == MCAST_NOTGMEMBER) 347 IP6STAT_INC(ip6s_notmember); 348 if (blocked == MCAST_NOTSMEMBER || 349 blocked == MCAST_MUTED) 350 UDPSTAT_INC(udps_filtermcast); 351 INP_RUNLOCK(inp); /* XXX */ 352 continue; 353 } 354 355 INP_RUNLOCK(inp); 356 } 357 if (last != NULL) { 358 struct mbuf *n; 359 360 if ((n = m_copy(m, 0, M_COPYALL)) != NULL) { 361 INP_RLOCK(last); 362 up = intoudpcb(last); 363 if (up->u_tun_func == NULL) { 364 udp6_append(last, n, off, &fromsa); 365 } else { 366 /* 367 * Engage the tunneling 368 * protocol we will have to 369 * leave the info_lock up, 370 * since we are hunting 371 * through multiple UDP's. 372 * 373 */ 374 (*up->u_tun_func)(n, off, last); 375 } 376 INP_RUNLOCK(last); 377 } 378 } 379 last = inp; 380 /* 381 * Don't look for additional matches if this one does 382 * not have either the SO_REUSEPORT or SO_REUSEADDR 383 * socket options set. This heuristic avoids 384 * searching through all pcbs in the common case of a 385 * non-shared port. It assumes that an application 386 * will never clear these options after setting them. 387 */ 388 if ((last->inp_socket->so_options & 389 (SO_REUSEPORT|SO_REUSEADDR)) == 0) 390 break; 391 } 392 393 if (last == NULL) { 394 /* 395 * No matching pcb found; discard datagram. (No need 396 * to send an ICMP Port Unreachable for a broadcast 397 * or multicast datgram.) 398 */ 399 UDPSTAT_INC(udps_noport); 400 UDPSTAT_INC(udps_noportmcast); 401 goto badheadlocked; 402 } 403 INP_RLOCK(last); 404 INP_INFO_RUNLOCK(pcbinfo); 405 up = intoudpcb(last); 406 UDP_PROBE(receive, NULL, last, ip6, last, uh); 407 if (up->u_tun_func == NULL) { 408 udp6_append(last, m, off, &fromsa); 409 } else { 410 /* 411 * Engage the tunneling protocol. 412 */ 413 (*up->u_tun_func)(m, off, last); 414 } 415 INP_RUNLOCK(last); 416 return (IPPROTO_DONE); 417 } 418 /* 419 * Locate pcb for datagram. 420 */ 421 422 /* 423 * Grab info from PACKET_TAG_IPFORWARD tag prepended to the chain. 424 */ 425 if ((m->m_flags & M_IP6_NEXTHOP) && 426 (fwd_tag = m_tag_find(m, PACKET_TAG_IPFORWARD, NULL)) != NULL) { 427 struct sockaddr_in6 *next_hop6; 428 429 next_hop6 = (struct sockaddr_in6 *)(fwd_tag + 1); 430 431 /* 432 * Transparently forwarded. Pretend to be the destination. 433 * Already got one like this? 434 */ 435 inp = in6_pcblookup_mbuf(pcbinfo, &ip6->ip6_src, 436 uh->uh_sport, &ip6->ip6_dst, uh->uh_dport, 437 INPLOOKUP_RLOCKPCB, m->m_pkthdr.rcvif, m); 438 if (!inp) { 439 /* 440 * It's new. Try to find the ambushing socket. 441 * Because we've rewritten the destination address, 442 * any hardware-generated hash is ignored. 443 */ 444 inp = in6_pcblookup(pcbinfo, &ip6->ip6_src, 445 uh->uh_sport, &next_hop6->sin6_addr, 446 next_hop6->sin6_port ? htons(next_hop6->sin6_port) : 447 uh->uh_dport, INPLOOKUP_WILDCARD | 448 INPLOOKUP_RLOCKPCB, m->m_pkthdr.rcvif); 449 } 450 /* Remove the tag from the packet. We don't need it anymore. */ 451 m_tag_delete(m, fwd_tag); 452 m->m_flags &= ~M_IP6_NEXTHOP; 453 } else 454 inp = in6_pcblookup_mbuf(pcbinfo, &ip6->ip6_src, 455 uh->uh_sport, &ip6->ip6_dst, uh->uh_dport, 456 INPLOOKUP_WILDCARD | INPLOOKUP_RLOCKPCB, 457 m->m_pkthdr.rcvif, m); 458 if (inp == NULL) { 459 if (udp_log_in_vain) { 460 char ip6bufs[INET6_ADDRSTRLEN]; 461 char ip6bufd[INET6_ADDRSTRLEN]; 462 463 log(LOG_INFO, 464 "Connection attempt to UDP [%s]:%d from [%s]:%d\n", 465 ip6_sprintf(ip6bufd, &ip6->ip6_dst), 466 ntohs(uh->uh_dport), 467 ip6_sprintf(ip6bufs, &ip6->ip6_src), 468 ntohs(uh->uh_sport)); 469 } 470 UDPSTAT_INC(udps_noport); 471 if (m->m_flags & M_MCAST) { 472 printf("UDP6: M_MCAST is set in a unicast packet.\n"); 473 UDPSTAT_INC(udps_noportmcast); 474 goto badunlocked; 475 } 476 if (V_udp_blackhole) 477 goto badunlocked; 478 if (badport_bandlim(BANDLIM_ICMP6_UNREACH) < 0) 479 goto badunlocked; 480 icmp6_error(m, ICMP6_DST_UNREACH, ICMP6_DST_UNREACH_NOPORT, 0); 481 return (IPPROTO_DONE); 482 } 483 INP_RLOCK_ASSERT(inp); 484 up = intoudpcb(inp); 485 if (cscov_partial) { 486 if (up->u_rxcslen == 0 || up->u_rxcslen > ulen) { 487 INP_RUNLOCK(inp); 488 m_freem(m); 489 return (IPPROTO_DONE); 490 } 491 } 492 UDP_PROBE(receive, NULL, inp, ip6, inp, uh); 493 if (up->u_tun_func == NULL) { 494 udp6_append(inp, m, off, &fromsa); 495 } else { 496 /* 497 * Engage the tunneling protocol. 498 */ 499 500 (*up->u_tun_func)(m, off, inp); 501 } 502 INP_RUNLOCK(inp); 503 return (IPPROTO_DONE); 504 505 badheadlocked: 506 INP_INFO_RUNLOCK(pcbinfo); 507 badunlocked: 508 if (m) 509 m_freem(m); 510 return (IPPROTO_DONE); 511 } 512 513 static void 514 udp6_common_ctlinput(int cmd, struct sockaddr *sa, void *d, 515 struct inpcbinfo *pcbinfo) 516 { 517 struct udphdr uh; 518 struct ip6_hdr *ip6; 519 struct mbuf *m; 520 int off = 0; 521 struct ip6ctlparam *ip6cp = NULL; 522 const struct sockaddr_in6 *sa6_src = NULL; 523 void *cmdarg; 524 struct inpcb *(*notify)(struct inpcb *, int) = udp_notify; 525 struct udp_portonly { 526 u_int16_t uh_sport; 527 u_int16_t uh_dport; 528 } *uhp; 529 530 if (sa->sa_family != AF_INET6 || 531 sa->sa_len != sizeof(struct sockaddr_in6)) 532 return; 533 534 if ((unsigned)cmd >= PRC_NCMDS) 535 return; 536 if (PRC_IS_REDIRECT(cmd)) 537 notify = in6_rtchange, d = NULL; 538 else if (cmd == PRC_HOSTDEAD) 539 d = NULL; 540 else if (inet6ctlerrmap[cmd] == 0) 541 return; 542 543 /* if the parameter is from icmp6, decode it. */ 544 if (d != NULL) { 545 ip6cp = (struct ip6ctlparam *)d; 546 m = ip6cp->ip6c_m; 547 ip6 = ip6cp->ip6c_ip6; 548 off = ip6cp->ip6c_off; 549 cmdarg = ip6cp->ip6c_cmdarg; 550 sa6_src = ip6cp->ip6c_src; 551 } else { 552 m = NULL; 553 ip6 = NULL; 554 cmdarg = NULL; 555 sa6_src = &sa6_any; 556 } 557 558 if (ip6) { 559 /* 560 * XXX: We assume that when IPV6 is non NULL, 561 * M and OFF are valid. 562 */ 563 564 /* Check if we can safely examine src and dst ports. */ 565 if (m->m_pkthdr.len < off + sizeof(*uhp)) 566 return; 567 568 bzero(&uh, sizeof(uh)); 569 m_copydata(m, off, sizeof(*uhp), (caddr_t)&uh); 570 571 (void)in6_pcbnotify(pcbinfo, sa, uh.uh_dport, 572 (struct sockaddr *)ip6cp->ip6c_src, uh.uh_sport, cmd, 573 cmdarg, notify); 574 } else 575 (void)in6_pcbnotify(pcbinfo, sa, 0, 576 (const struct sockaddr *)sa6_src, 0, cmd, cmdarg, notify); 577 } 578 579 void 580 udp6_ctlinput(int cmd, struct sockaddr *sa, void *d) 581 { 582 583 return (udp6_common_ctlinput(cmd, sa, d, &V_udbinfo)); 584 } 585 586 void 587 udplite6_ctlinput(int cmd, struct sockaddr *sa, void *d) 588 { 589 590 return (udp6_common_ctlinput(cmd, sa, d, &V_ulitecbinfo)); 591 } 592 593 static int 594 udp6_getcred(SYSCTL_HANDLER_ARGS) 595 { 596 struct xucred xuc; 597 struct sockaddr_in6 addrs[2]; 598 struct inpcb *inp; 599 int error; 600 601 error = priv_check(req->td, PRIV_NETINET_GETCRED); 602 if (error) 603 return (error); 604 605 if (req->newlen != sizeof(addrs)) 606 return (EINVAL); 607 if (req->oldlen != sizeof(struct xucred)) 608 return (EINVAL); 609 error = SYSCTL_IN(req, addrs, sizeof(addrs)); 610 if (error) 611 return (error); 612 if ((error = sa6_embedscope(&addrs[0], V_ip6_use_defzone)) != 0 || 613 (error = sa6_embedscope(&addrs[1], V_ip6_use_defzone)) != 0) { 614 return (error); 615 } 616 inp = in6_pcblookup(&V_udbinfo, &addrs[1].sin6_addr, 617 addrs[1].sin6_port, &addrs[0].sin6_addr, addrs[0].sin6_port, 618 INPLOOKUP_WILDCARD | INPLOOKUP_RLOCKPCB, NULL); 619 if (inp != NULL) { 620 INP_RLOCK_ASSERT(inp); 621 if (inp->inp_socket == NULL) 622 error = ENOENT; 623 if (error == 0) 624 error = cr_canseesocket(req->td->td_ucred, 625 inp->inp_socket); 626 if (error == 0) 627 cru2x(inp->inp_cred, &xuc); 628 INP_RUNLOCK(inp); 629 } else 630 error = ENOENT; 631 if (error == 0) 632 error = SYSCTL_OUT(req, &xuc, sizeof(struct xucred)); 633 return (error); 634 } 635 636 SYSCTL_PROC(_net_inet6_udp6, OID_AUTO, getcred, CTLTYPE_OPAQUE|CTLFLAG_RW, 0, 637 0, udp6_getcred, "S,xucred", "Get the xucred of a UDP6 connection"); 638 639 static int 640 udp6_output(struct inpcb *inp, struct mbuf *m, struct sockaddr *addr6, 641 struct mbuf *control, struct thread *td) 642 { 643 u_int32_t ulen = m->m_pkthdr.len; 644 u_int32_t plen = sizeof(struct udphdr) + ulen; 645 struct ip6_hdr *ip6; 646 struct udphdr *udp6; 647 struct in6_addr *laddr, *faddr, in6a; 648 struct sockaddr_in6 *sin6 = NULL; 649 struct ifnet *oifp = NULL; 650 int cscov_partial = 0; 651 int scope_ambiguous = 0; 652 u_short fport; 653 int error = 0; 654 uint8_t nxt; 655 uint16_t cscov = 0; 656 struct ip6_pktopts *optp, opt; 657 int af = AF_INET6, hlen = sizeof(struct ip6_hdr); 658 int flags; 659 struct sockaddr_in6 tmp; 660 661 INP_WLOCK_ASSERT(inp); 662 INP_HASH_WLOCK_ASSERT(inp->inp_pcbinfo); 663 664 if (addr6) { 665 /* addr6 has been validated in udp6_send(). */ 666 sin6 = (struct sockaddr_in6 *)addr6; 667 668 /* protect *sin6 from overwrites */ 669 tmp = *sin6; 670 sin6 = &tmp; 671 672 /* 673 * Application should provide a proper zone ID or the use of 674 * default zone IDs should be enabled. Unfortunately, some 675 * applications do not behave as it should, so we need a 676 * workaround. Even if an appropriate ID is not determined, 677 * we'll see if we can determine the outgoing interface. If we 678 * can, determine the zone ID based on the interface below. 679 */ 680 if (sin6->sin6_scope_id == 0 && !V_ip6_use_defzone) 681 scope_ambiguous = 1; 682 if ((error = sa6_embedscope(sin6, V_ip6_use_defzone)) != 0) 683 return (error); 684 } 685 686 if (control) { 687 if ((error = ip6_setpktopts(control, &opt, 688 inp->in6p_outputopts, td->td_ucred, IPPROTO_UDP)) != 0) 689 goto release; 690 optp = &opt; 691 } else 692 optp = inp->in6p_outputopts; 693 694 if (sin6) { 695 faddr = &sin6->sin6_addr; 696 697 /* 698 * Since we saw no essential reason for calling in_pcbconnect, 699 * we get rid of such kind of logic, and call in6_selectsrc 700 * and in6_pcbsetport in order to fill in the local address 701 * and the local port. 702 */ 703 if (sin6->sin6_port == 0) { 704 error = EADDRNOTAVAIL; 705 goto release; 706 } 707 708 if (!IN6_IS_ADDR_UNSPECIFIED(&inp->in6p_faddr)) { 709 /* how about ::ffff:0.0.0.0 case? */ 710 error = EISCONN; 711 goto release; 712 } 713 714 fport = sin6->sin6_port; /* allow 0 port */ 715 716 if (IN6_IS_ADDR_V4MAPPED(faddr)) { 717 if ((inp->inp_flags & IN6P_IPV6_V6ONLY)) { 718 /* 719 * I believe we should explicitly discard the 720 * packet when mapped addresses are disabled, 721 * rather than send the packet as an IPv6 one. 722 * If we chose the latter approach, the packet 723 * might be sent out on the wire based on the 724 * default route, the situation which we'd 725 * probably want to avoid. 726 * (20010421 jinmei@kame.net) 727 */ 728 error = EINVAL; 729 goto release; 730 } 731 if (!IN6_IS_ADDR_UNSPECIFIED(&inp->in6p_laddr) && 732 !IN6_IS_ADDR_V4MAPPED(&inp->in6p_laddr)) { 733 /* 734 * when remote addr is an IPv4-mapped address, 735 * local addr should not be an IPv6 address, 736 * since you cannot determine how to map IPv6 737 * source address to IPv4. 738 */ 739 error = EINVAL; 740 goto release; 741 } 742 743 af = AF_INET; 744 } 745 746 if (!IN6_IS_ADDR_V4MAPPED(faddr)) { 747 error = in6_selectsrc(sin6, optp, inp, NULL, 748 td->td_ucred, &oifp, &in6a); 749 if (error) 750 goto release; 751 if (oifp && scope_ambiguous && 752 (error = in6_setscope(&sin6->sin6_addr, 753 oifp, NULL))) { 754 goto release; 755 } 756 laddr = &in6a; 757 } else 758 laddr = &inp->in6p_laddr; /* XXX */ 759 if (laddr == NULL) { 760 if (error == 0) 761 error = EADDRNOTAVAIL; 762 goto release; 763 } 764 if (inp->inp_lport == 0 && 765 (error = in6_pcbsetport(laddr, inp, td->td_ucred)) != 0) { 766 /* Undo an address bind that may have occurred. */ 767 inp->in6p_laddr = in6addr_any; 768 goto release; 769 } 770 } else { 771 if (IN6_IS_ADDR_UNSPECIFIED(&inp->in6p_faddr)) { 772 error = ENOTCONN; 773 goto release; 774 } 775 if (IN6_IS_ADDR_V4MAPPED(&inp->in6p_faddr)) { 776 if ((inp->inp_flags & IN6P_IPV6_V6ONLY)) { 777 /* 778 * XXX: this case would happen when the 779 * application sets the V6ONLY flag after 780 * connecting the foreign address. 781 * Such applications should be fixed, 782 * so we bark here. 783 */ 784 log(LOG_INFO, "udp6_output: IPV6_V6ONLY " 785 "option was set for a connected socket\n"); 786 error = EINVAL; 787 goto release; 788 } else 789 af = AF_INET; 790 } 791 laddr = &inp->in6p_laddr; 792 faddr = &inp->in6p_faddr; 793 fport = inp->inp_fport; 794 } 795 796 if (af == AF_INET) 797 hlen = sizeof(struct ip); 798 799 /* 800 * Calculate data length and get a mbuf 801 * for UDP and IP6 headers. 802 */ 803 M_PREPEND(m, hlen + sizeof(struct udphdr), M_NOWAIT); 804 if (m == 0) { 805 error = ENOBUFS; 806 goto release; 807 } 808 809 /* 810 * Stuff checksum and output datagram. 811 */ 812 nxt = (inp->inp_socket->so_proto->pr_protocol == IPPROTO_UDP) ? 813 IPPROTO_UDP : IPPROTO_UDPLITE; 814 udp6 = (struct udphdr *)(mtod(m, caddr_t) + hlen); 815 udp6->uh_sport = inp->inp_lport; /* lport is always set in the PCB */ 816 udp6->uh_dport = fport; 817 if (nxt == IPPROTO_UDPLITE) { 818 struct udpcb *up; 819 820 up = intoudpcb(inp); 821 cscov = up->u_txcslen; 822 if (cscov >= plen) 823 cscov = 0; 824 udp6->uh_ulen = htons(cscov); 825 /* 826 * For UDP-Lite, checksum coverage length of zero means 827 * the entire UDPLite packet is covered by the checksum. 828 */ 829 cscov_partial = (cscov == 0) ? 0 : 1; 830 } else if (plen <= 0xffff) 831 udp6->uh_ulen = htons((u_short)plen); 832 else 833 udp6->uh_ulen = 0; 834 udp6->uh_sum = 0; 835 836 switch (af) { 837 case AF_INET6: 838 ip6 = mtod(m, struct ip6_hdr *); 839 ip6->ip6_flow = inp->inp_flow & IPV6_FLOWINFO_MASK; 840 ip6->ip6_vfc &= ~IPV6_VERSION_MASK; 841 ip6->ip6_vfc |= IPV6_VERSION; 842 ip6->ip6_plen = htons((u_short)plen); 843 ip6->ip6_nxt = nxt; 844 ip6->ip6_hlim = in6_selecthlim(inp, NULL); 845 ip6->ip6_src = *laddr; 846 ip6->ip6_dst = *faddr; 847 848 if (cscov_partial) { 849 if ((udp6->uh_sum = in6_cksum_partial(m, nxt, 850 sizeof(struct ip6_hdr), plen, cscov)) == 0) 851 udp6->uh_sum = 0xffff; 852 } else { 853 udp6->uh_sum = in6_cksum_pseudo(ip6, plen, nxt, 0); 854 m->m_pkthdr.csum_flags = CSUM_UDP_IPV6; 855 m->m_pkthdr.csum_data = offsetof(struct udphdr, uh_sum); 856 } 857 858 flags = 0; 859 860 UDP_PROBE(send, NULL, inp, ip6, inp, udp6); 861 UDPSTAT_INC(udps_opackets); 862 error = ip6_output(m, optp, NULL, flags, inp->in6p_moptions, 863 NULL, inp); 864 break; 865 case AF_INET: 866 error = EAFNOSUPPORT; 867 goto release; 868 } 869 goto releaseopt; 870 871 release: 872 m_freem(m); 873 874 releaseopt: 875 if (control) { 876 ip6_clearpktopts(&opt, -1); 877 m_freem(control); 878 } 879 return (error); 880 } 881 882 static void 883 udp6_abort(struct socket *so) 884 { 885 struct inpcb *inp; 886 struct inpcbinfo *pcbinfo; 887 888 pcbinfo = get_inpcbinfo(so->so_proto->pr_protocol); 889 inp = sotoinpcb(so); 890 KASSERT(inp != NULL, ("udp6_abort: inp == NULL")); 891 892 #ifdef INET 893 if (inp->inp_vflag & INP_IPV4) { 894 struct pr_usrreqs *pru; 895 896 pru = inetsw[ip_protox[IPPROTO_UDP]].pr_usrreqs; 897 (*pru->pru_abort)(so); 898 return; 899 } 900 #endif 901 902 INP_WLOCK(inp); 903 if (!IN6_IS_ADDR_UNSPECIFIED(&inp->in6p_faddr)) { 904 INP_HASH_WLOCK(pcbinfo); 905 in6_pcbdisconnect(inp); 906 inp->in6p_laddr = in6addr_any; 907 INP_HASH_WUNLOCK(pcbinfo); 908 soisdisconnected(so); 909 } 910 INP_WUNLOCK(inp); 911 } 912 913 static int 914 udp6_attach(struct socket *so, int proto, struct thread *td) 915 { 916 struct inpcb *inp; 917 struct inpcbinfo *pcbinfo; 918 int error; 919 920 pcbinfo = get_inpcbinfo(so->so_proto->pr_protocol); 921 inp = sotoinpcb(so); 922 KASSERT(inp == NULL, ("udp6_attach: inp != NULL")); 923 924 if (so->so_snd.sb_hiwat == 0 || so->so_rcv.sb_hiwat == 0) { 925 error = soreserve(so, udp_sendspace, udp_recvspace); 926 if (error) 927 return (error); 928 } 929 INP_INFO_WLOCK(pcbinfo); 930 error = in_pcballoc(so, pcbinfo); 931 if (error) { 932 INP_INFO_WUNLOCK(pcbinfo); 933 return (error); 934 } 935 inp = (struct inpcb *)so->so_pcb; 936 inp->inp_vflag |= INP_IPV6; 937 if ((inp->inp_flags & IN6P_IPV6_V6ONLY) == 0) 938 inp->inp_vflag |= INP_IPV4; 939 inp->in6p_hops = -1; /* use kernel default */ 940 inp->in6p_cksum = -1; /* just to be sure */ 941 /* 942 * XXX: ugly!! 943 * IPv4 TTL initialization is necessary for an IPv6 socket as well, 944 * because the socket may be bound to an IPv6 wildcard address, 945 * which may match an IPv4-mapped IPv6 address. 946 */ 947 inp->inp_ip_ttl = V_ip_defttl; 948 949 error = udp_newudpcb(inp); 950 if (error) { 951 in_pcbdetach(inp); 952 in_pcbfree(inp); 953 INP_INFO_WUNLOCK(pcbinfo); 954 return (error); 955 } 956 INP_WUNLOCK(inp); 957 INP_INFO_WUNLOCK(pcbinfo); 958 return (0); 959 } 960 961 static int 962 udp6_bind(struct socket *so, struct sockaddr *nam, struct thread *td) 963 { 964 struct inpcb *inp; 965 struct inpcbinfo *pcbinfo; 966 int error; 967 968 pcbinfo = get_inpcbinfo(so->so_proto->pr_protocol); 969 inp = sotoinpcb(so); 970 KASSERT(inp != NULL, ("udp6_bind: inp == NULL")); 971 972 INP_WLOCK(inp); 973 INP_HASH_WLOCK(pcbinfo); 974 inp->inp_vflag &= ~INP_IPV4; 975 inp->inp_vflag |= INP_IPV6; 976 if ((inp->inp_flags & IN6P_IPV6_V6ONLY) == 0) { 977 struct sockaddr_in6 *sin6_p; 978 979 sin6_p = (struct sockaddr_in6 *)nam; 980 981 if (IN6_IS_ADDR_UNSPECIFIED(&sin6_p->sin6_addr)) 982 inp->inp_vflag |= INP_IPV4; 983 #ifdef INET 984 else if (IN6_IS_ADDR_V4MAPPED(&sin6_p->sin6_addr)) { 985 struct sockaddr_in sin; 986 987 in6_sin6_2_sin(&sin, sin6_p); 988 inp->inp_vflag |= INP_IPV4; 989 inp->inp_vflag &= ~INP_IPV6; 990 error = in_pcbbind(inp, (struct sockaddr *)&sin, 991 td->td_ucred); 992 goto out; 993 } 994 #endif 995 } 996 997 error = in6_pcbbind(inp, nam, td->td_ucred); 998 #ifdef INET 999 out: 1000 #endif 1001 INP_HASH_WUNLOCK(pcbinfo); 1002 INP_WUNLOCK(inp); 1003 return (error); 1004 } 1005 1006 static void 1007 udp6_close(struct socket *so) 1008 { 1009 struct inpcb *inp; 1010 struct inpcbinfo *pcbinfo; 1011 1012 pcbinfo = get_inpcbinfo(so->so_proto->pr_protocol); 1013 inp = sotoinpcb(so); 1014 KASSERT(inp != NULL, ("udp6_close: inp == NULL")); 1015 1016 #ifdef INET 1017 if (inp->inp_vflag & INP_IPV4) { 1018 struct pr_usrreqs *pru; 1019 1020 pru = inetsw[ip_protox[IPPROTO_UDP]].pr_usrreqs; 1021 (*pru->pru_disconnect)(so); 1022 return; 1023 } 1024 #endif 1025 INP_WLOCK(inp); 1026 if (!IN6_IS_ADDR_UNSPECIFIED(&inp->in6p_faddr)) { 1027 INP_HASH_WLOCK(pcbinfo); 1028 in6_pcbdisconnect(inp); 1029 inp->in6p_laddr = in6addr_any; 1030 INP_HASH_WUNLOCK(pcbinfo); 1031 soisdisconnected(so); 1032 } 1033 INP_WUNLOCK(inp); 1034 } 1035 1036 static int 1037 udp6_connect(struct socket *so, struct sockaddr *nam, struct thread *td) 1038 { 1039 struct inpcb *inp; 1040 struct inpcbinfo *pcbinfo; 1041 struct sockaddr_in6 *sin6; 1042 int error; 1043 1044 pcbinfo = get_inpcbinfo(so->so_proto->pr_protocol); 1045 inp = sotoinpcb(so); 1046 sin6 = (struct sockaddr_in6 *)nam; 1047 KASSERT(inp != NULL, ("udp6_connect: inp == NULL")); 1048 1049 /* 1050 * XXXRW: Need to clarify locking of v4/v6 flags. 1051 */ 1052 INP_WLOCK(inp); 1053 #ifdef INET 1054 if (IN6_IS_ADDR_V4MAPPED(&sin6->sin6_addr)) { 1055 struct sockaddr_in sin; 1056 1057 if ((inp->inp_flags & IN6P_IPV6_V6ONLY) != 0) { 1058 error = EINVAL; 1059 goto out; 1060 } 1061 if (inp->inp_faddr.s_addr != INADDR_ANY) { 1062 error = EISCONN; 1063 goto out; 1064 } 1065 in6_sin6_2_sin(&sin, sin6); 1066 inp->inp_vflag |= INP_IPV4; 1067 inp->inp_vflag &= ~INP_IPV6; 1068 error = prison_remote_ip4(td->td_ucred, &sin.sin_addr); 1069 if (error != 0) 1070 goto out; 1071 INP_HASH_WLOCK(pcbinfo); 1072 error = in_pcbconnect(inp, (struct sockaddr *)&sin, 1073 td->td_ucred); 1074 INP_HASH_WUNLOCK(pcbinfo); 1075 if (error == 0) 1076 soisconnected(so); 1077 goto out; 1078 } 1079 #endif 1080 if (!IN6_IS_ADDR_UNSPECIFIED(&inp->in6p_faddr)) { 1081 error = EISCONN; 1082 goto out; 1083 } 1084 inp->inp_vflag &= ~INP_IPV4; 1085 inp->inp_vflag |= INP_IPV6; 1086 error = prison_remote_ip6(td->td_ucred, &sin6->sin6_addr); 1087 if (error != 0) 1088 goto out; 1089 INP_HASH_WLOCK(pcbinfo); 1090 error = in6_pcbconnect(inp, nam, td->td_ucred); 1091 INP_HASH_WUNLOCK(pcbinfo); 1092 if (error == 0) 1093 soisconnected(so); 1094 out: 1095 INP_WUNLOCK(inp); 1096 return (error); 1097 } 1098 1099 static void 1100 udp6_detach(struct socket *so) 1101 { 1102 struct inpcb *inp; 1103 struct inpcbinfo *pcbinfo; 1104 struct udpcb *up; 1105 1106 pcbinfo = get_inpcbinfo(so->so_proto->pr_protocol); 1107 inp = sotoinpcb(so); 1108 KASSERT(inp != NULL, ("udp6_detach: inp == NULL")); 1109 1110 INP_INFO_WLOCK(pcbinfo); 1111 INP_WLOCK(inp); 1112 up = intoudpcb(inp); 1113 KASSERT(up != NULL, ("%s: up == NULL", __func__)); 1114 in_pcbdetach(inp); 1115 in_pcbfree(inp); 1116 INP_INFO_WUNLOCK(pcbinfo); 1117 udp_discardcb(up); 1118 } 1119 1120 static int 1121 udp6_disconnect(struct socket *so) 1122 { 1123 struct inpcb *inp; 1124 struct inpcbinfo *pcbinfo; 1125 int error; 1126 1127 pcbinfo = get_inpcbinfo(so->so_proto->pr_protocol); 1128 inp = sotoinpcb(so); 1129 KASSERT(inp != NULL, ("udp6_disconnect: inp == NULL")); 1130 1131 #ifdef INET 1132 if (inp->inp_vflag & INP_IPV4) { 1133 struct pr_usrreqs *pru; 1134 1135 pru = inetsw[ip_protox[IPPROTO_UDP]].pr_usrreqs; 1136 (void)(*pru->pru_disconnect)(so); 1137 return (0); 1138 } 1139 #endif 1140 1141 INP_WLOCK(inp); 1142 1143 if (IN6_IS_ADDR_UNSPECIFIED(&inp->in6p_faddr)) { 1144 error = ENOTCONN; 1145 goto out; 1146 } 1147 1148 INP_HASH_WLOCK(pcbinfo); 1149 in6_pcbdisconnect(inp); 1150 inp->in6p_laddr = in6addr_any; 1151 INP_HASH_WUNLOCK(pcbinfo); 1152 SOCK_LOCK(so); 1153 so->so_state &= ~SS_ISCONNECTED; /* XXX */ 1154 SOCK_UNLOCK(so); 1155 out: 1156 INP_WUNLOCK(inp); 1157 return (0); 1158 } 1159 1160 static int 1161 udp6_send(struct socket *so, int flags, struct mbuf *m, 1162 struct sockaddr *addr, struct mbuf *control, struct thread *td) 1163 { 1164 struct inpcb *inp; 1165 struct inpcbinfo *pcbinfo; 1166 int error = 0; 1167 1168 pcbinfo = get_inpcbinfo(so->so_proto->pr_protocol); 1169 inp = sotoinpcb(so); 1170 KASSERT(inp != NULL, ("udp6_send: inp == NULL")); 1171 1172 INP_WLOCK(inp); 1173 if (addr) { 1174 if (addr->sa_len != sizeof(struct sockaddr_in6)) { 1175 error = EINVAL; 1176 goto bad; 1177 } 1178 if (addr->sa_family != AF_INET6) { 1179 error = EAFNOSUPPORT; 1180 goto bad; 1181 } 1182 } 1183 1184 #ifdef INET 1185 if ((inp->inp_flags & IN6P_IPV6_V6ONLY) == 0) { 1186 int hasv4addr; 1187 struct sockaddr_in6 *sin6 = 0; 1188 1189 if (addr == 0) 1190 hasv4addr = (inp->inp_vflag & INP_IPV4); 1191 else { 1192 sin6 = (struct sockaddr_in6 *)addr; 1193 hasv4addr = IN6_IS_ADDR_V4MAPPED(&sin6->sin6_addr) 1194 ? 1 : 0; 1195 } 1196 if (hasv4addr) { 1197 struct pr_usrreqs *pru; 1198 1199 /* 1200 * XXXRW: We release UDP-layer locks before calling 1201 * udp_send() in order to avoid recursion. However, 1202 * this does mean there is a short window where inp's 1203 * fields are unstable. Could this lead to a 1204 * potential race in which the factors causing us to 1205 * select the UDPv4 output routine are invalidated? 1206 */ 1207 INP_WUNLOCK(inp); 1208 if (sin6) 1209 in6_sin6_2_sin_in_sock(addr); 1210 pru = inetsw[ip_protox[IPPROTO_UDP]].pr_usrreqs; 1211 /* addr will just be freed in sendit(). */ 1212 return ((*pru->pru_send)(so, flags, m, addr, control, 1213 td)); 1214 } 1215 } 1216 #endif 1217 #ifdef MAC 1218 mac_inpcb_create_mbuf(inp, m); 1219 #endif 1220 INP_HASH_WLOCK(pcbinfo); 1221 error = udp6_output(inp, m, addr, control, td); 1222 INP_HASH_WUNLOCK(pcbinfo); 1223 #ifdef INET 1224 #endif 1225 INP_WUNLOCK(inp); 1226 return (error); 1227 1228 bad: 1229 INP_WUNLOCK(inp); 1230 m_freem(m); 1231 return (error); 1232 } 1233 1234 struct pr_usrreqs udp6_usrreqs = { 1235 .pru_abort = udp6_abort, 1236 .pru_attach = udp6_attach, 1237 .pru_bind = udp6_bind, 1238 .pru_connect = udp6_connect, 1239 .pru_control = in6_control, 1240 .pru_detach = udp6_detach, 1241 .pru_disconnect = udp6_disconnect, 1242 .pru_peeraddr = in6_mapped_peeraddr, 1243 .pru_send = udp6_send, 1244 .pru_shutdown = udp_shutdown, 1245 .pru_sockaddr = in6_mapped_sockaddr, 1246 .pru_soreceive = soreceive_dgram, 1247 .pru_sosend = sosend_dgram, 1248 .pru_sosetlabel = in_pcbsosetlabel, 1249 .pru_close = udp6_close 1250 };
Cache object: 353f3fc6b81699961ddeca189fc0a7e9
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