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("$FreeBSD$"); 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 #include <sys/vimage.h> 89 90 #include <net/if.h> 91 #include <net/if_types.h> 92 #include <net/route.h> 93 94 #include <netinet/in.h> 95 #include <netinet/in_pcb.h> 96 #include <netinet/in_systm.h> 97 #include <netinet/in_var.h> 98 #include <netinet/ip.h> 99 #include <netinet/ip_icmp.h> 100 #include <netinet/ip6.h> 101 #include <netinet/icmp_var.h> 102 #include <netinet/icmp6.h> 103 #include <netinet/ip_var.h> 104 #include <netinet/udp.h> 105 #include <netinet/udp_var.h> 106 #include <netinet/vinet.h> 107 108 #include <netinet6/ip6protosw.h> 109 #include <netinet6/ip6_var.h> 110 #include <netinet6/in6_pcb.h> 111 #include <netinet6/udp6_var.h> 112 #include <netinet6/scope6_var.h> 113 #include <netinet6/vinet6.h> 114 115 #ifdef IPSEC 116 #include <netipsec/ipsec.h> 117 #include <netipsec/ipsec6.h> 118 #endif /* IPSEC */ 119 120 #include <security/mac/mac_framework.h> 121 122 /* 123 * UDP protocol implementation. 124 * Per RFC 768, August, 1980. 125 */ 126 127 extern struct protosw inetsw[]; 128 static void udp6_detach(struct socket *so); 129 130 static void 131 udp6_append(struct inpcb *inp, struct mbuf *n, int off, 132 struct sockaddr_in6 *fromsa) 133 { 134 INIT_VNET_INET(inp->inp_vnet); 135 struct socket *so; 136 struct mbuf *opts; 137 138 INP_LOCK_ASSERT(inp); 139 140 #ifdef IPSEC 141 /* Check AH/ESP integrity. */ 142 if (ipsec6_in_reject(n, inp)) { 143 INIT_VNET_IPSEC(inp->inp_vnet); 144 m_freem(n); 145 V_ipsec6stat.in_polvio++; 146 return; 147 } 148 #endif /* IPSEC */ 149 #ifdef MAC 150 if (mac_inpcb_check_deliver(inp, n) != 0) { 151 m_freem(n); 152 return; 153 } 154 #endif 155 opts = NULL; 156 if (inp->inp_flags & INP_CONTROLOPTS || 157 inp->inp_socket->so_options & SO_TIMESTAMP) 158 ip6_savecontrol(inp, n, &opts); 159 m_adj(n, off + sizeof(struct udphdr)); 160 161 so = inp->inp_socket; 162 SOCKBUF_LOCK(&so->so_rcv); 163 if (sbappendaddr_locked(&so->so_rcv, (struct sockaddr *)fromsa, n, 164 opts) == 0) { 165 SOCKBUF_UNLOCK(&so->so_rcv); 166 m_freem(n); 167 if (opts) 168 m_freem(opts); 169 UDPSTAT_INC(udps_fullsock); 170 } else 171 sorwakeup_locked(so); 172 } 173 174 int 175 udp6_input(struct mbuf **mp, int *offp, int proto) 176 { 177 INIT_VNET_INET(curvnet); 178 INIT_VNET_INET6(curvnet); 179 struct mbuf *m = *mp; 180 struct ifnet *ifp; 181 struct ip6_hdr *ip6; 182 struct udphdr *uh; 183 struct inpcb *inp; 184 int off = *offp; 185 int plen, ulen; 186 struct sockaddr_in6 fromsa; 187 188 ifp = m->m_pkthdr.rcvif; 189 ip6 = mtod(m, struct ip6_hdr *); 190 191 if (faithprefix_p != NULL && (*faithprefix_p)(&ip6->ip6_dst)) { 192 /* XXX send icmp6 host/port unreach? */ 193 m_freem(m); 194 return (IPPROTO_DONE); 195 } 196 197 #ifndef PULLDOWN_TEST 198 IP6_EXTHDR_CHECK(m, off, sizeof(struct udphdr), IPPROTO_DONE); 199 ip6 = mtod(m, struct ip6_hdr *); 200 uh = (struct udphdr *)((caddr_t)ip6 + off); 201 #else 202 IP6_EXTHDR_GET(uh, struct udphdr *, m, off, sizeof(*uh)); 203 if (!uh) 204 return (IPPROTO_DONE); 205 #endif 206 207 UDPSTAT_INC(udps_ipackets); 208 209 /* 210 * Destination port of 0 is illegal, based on RFC768. 211 */ 212 if (uh->uh_dport == 0) 213 goto badunlocked; 214 215 plen = ntohs(ip6->ip6_plen) - off + sizeof(*ip6); 216 ulen = ntohs((u_short)uh->uh_ulen); 217 218 if (plen != ulen) { 219 UDPSTAT_INC(udps_badlen); 220 goto badunlocked; 221 } 222 223 /* 224 * Checksum extended UDP header and data. 225 */ 226 if (uh->uh_sum == 0) { 227 UDPSTAT_INC(udps_nosum); 228 goto badunlocked; 229 } 230 if (in6_cksum(m, IPPROTO_UDP, off, ulen) != 0) { 231 UDPSTAT_INC(udps_badsum); 232 goto badunlocked; 233 } 234 235 /* 236 * Construct sockaddr format source address. 237 */ 238 init_sin6(&fromsa, m); 239 fromsa.sin6_port = uh->uh_sport; 240 241 INP_INFO_RLOCK(&V_udbinfo); 242 if (IN6_IS_ADDR_MULTICAST(&ip6->ip6_dst)) { 243 struct inpcb *last; 244 struct ip6_moptions *imo; 245 246 /* 247 * In the event that laddr should be set to the link-local 248 * address (this happens in RIPng), the multicast address 249 * specified in the received packet will not match laddr. To 250 * handle this situation, matching is relaxed if the 251 * receiving interface is the same as one specified in the 252 * socket and if the destination multicast address matches 253 * one of the multicast groups specified in the socket. 254 */ 255 256 /* 257 * KAME note: traditionally we dropped udpiphdr from mbuf 258 * here. We need udphdr for IPsec processing so we do that 259 * later. 260 */ 261 last = NULL; 262 LIST_FOREACH(inp, &V_udb, inp_list) { 263 if ((inp->inp_vflag & INP_IPV6) == 0) 264 continue; 265 if (inp->inp_lport != uh->uh_dport) 266 continue; 267 if (inp->inp_fport != 0 && 268 inp->inp_fport != uh->uh_sport) 269 continue; 270 if (!IN6_IS_ADDR_UNSPECIFIED(&inp->in6p_laddr)) { 271 if (!IN6_ARE_ADDR_EQUAL(&inp->in6p_laddr, 272 &ip6->ip6_dst)) 273 continue; 274 } 275 if (!IN6_IS_ADDR_UNSPECIFIED(&inp->in6p_faddr)) { 276 if (!IN6_ARE_ADDR_EQUAL(&inp->in6p_faddr, 277 &ip6->ip6_src) || 278 inp->inp_fport != uh->uh_sport) 279 continue; 280 } 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 if (last->inp_ppcb != NULL) { 319 /* 320 * Engage the tunneling 321 * protocol we will have to 322 * leave the info_lock up, 323 * since we are hunting 324 * through multiple UDP's. 325 * 326 */ 327 udp_tun_func_t tunnel_func; 328 329 tunnel_func = (udp_tun_func_t)last->inp_ppcb; 330 tunnel_func(n, off, last); 331 INP_RUNLOCK(last); 332 } else { 333 udp6_append(last, n, off, &fromsa); 334 INP_RUNLOCK(last); 335 } 336 } 337 } 338 last = inp; 339 /* 340 * Don't look for additional matches if this one does 341 * not have either the SO_REUSEPORT or SO_REUSEADDR 342 * socket options set. This heuristic avoids 343 * searching through all pcbs in the common case of a 344 * non-shared port. It assumes that an application 345 * will never clear these options after setting them. 346 */ 347 if ((last->inp_socket->so_options & 348 (SO_REUSEPORT|SO_REUSEADDR)) == 0) 349 break; 350 } 351 352 if (last == NULL) { 353 /* 354 * No matching pcb found; discard datagram. (No need 355 * to send an ICMP Port Unreachable for a broadcast 356 * or multicast datgram.) 357 */ 358 UDPSTAT_INC(udps_noport); 359 UDPSTAT_INC(udps_noportmcast); 360 goto badheadlocked; 361 } 362 INP_RLOCK(last); 363 INP_INFO_RUNLOCK(&V_udbinfo); 364 if (last->inp_ppcb != NULL) { 365 /* 366 * Engage the tunneling protocol. 367 */ 368 udp_tun_func_t tunnel_func; 369 370 tunnel_func = (udp_tun_func_t)inp->inp_ppcb; 371 tunnel_func(m, off, last); 372 INP_RUNLOCK(last); 373 return (IPPROTO_DONE); 374 } 375 udp6_append(last, m, off, &fromsa); 376 INP_RUNLOCK(last); 377 return (IPPROTO_DONE); 378 } 379 /* 380 * Locate pcb for datagram. 381 */ 382 inp = in6_pcblookup_hash(&V_udbinfo, &ip6->ip6_src, uh->uh_sport, 383 &ip6->ip6_dst, uh->uh_dport, 1, m->m_pkthdr.rcvif); 384 if (inp == NULL) { 385 if (udp_log_in_vain) { 386 char ip6bufs[INET6_ADDRSTRLEN]; 387 char ip6bufd[INET6_ADDRSTRLEN]; 388 389 log(LOG_INFO, 390 "Connection attempt to UDP [%s]:%d from [%s]:%d\n", 391 ip6_sprintf(ip6bufd, &ip6->ip6_dst), 392 ntohs(uh->uh_dport), 393 ip6_sprintf(ip6bufs, &ip6->ip6_src), 394 ntohs(uh->uh_sport)); 395 } 396 UDPSTAT_INC(udps_noport); 397 if (m->m_flags & M_MCAST) { 398 printf("UDP6: M_MCAST is set in a unicast packet.\n"); 399 UDPSTAT_INC(udps_noportmcast); 400 goto badheadlocked; 401 } 402 INP_INFO_RUNLOCK(&V_udbinfo); 403 if (V_udp_blackhole) 404 goto badunlocked; 405 if (badport_bandlim(BANDLIM_ICMP6_UNREACH) < 0) 406 goto badunlocked; 407 icmp6_error(m, ICMP6_DST_UNREACH, ICMP6_DST_UNREACH_NOPORT, 0); 408 return (IPPROTO_DONE); 409 } 410 INP_RLOCK(inp); 411 INP_INFO_RUNLOCK(&V_udbinfo); 412 if (inp->inp_ppcb != NULL) { 413 /* 414 * Engage the tunneling protocol. 415 */ 416 udp_tun_func_t tunnel_func; 417 418 tunnel_func = (udp_tun_func_t)inp->inp_ppcb; 419 tunnel_func(m, off, inp); 420 INP_RUNLOCK(inp); 421 return (IPPROTO_DONE); 422 } 423 udp6_append(inp, m, off, &fromsa); 424 INP_RUNLOCK(inp); 425 return (IPPROTO_DONE); 426 427 badheadlocked: 428 INP_INFO_RUNLOCK(&V_udbinfo); 429 badunlocked: 430 if (m) 431 m_freem(m); 432 return (IPPROTO_DONE); 433 } 434 435 void 436 udp6_ctlinput(int cmd, struct sockaddr *sa, void *d) 437 { 438 INIT_VNET_INET(curvnet); 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 INIT_VNET_INET(curvnet); 505 INIT_VNET_INET6(curvnet); 506 struct xucred xuc; 507 struct sockaddr_in6 addrs[2]; 508 struct inpcb *inp; 509 int error; 510 511 error = priv_check(req->td, PRIV_NETINET_GETCRED); 512 if (error) 513 return (error); 514 515 if (req->newlen != sizeof(addrs)) 516 return (EINVAL); 517 if (req->oldlen != sizeof(struct xucred)) 518 return (EINVAL); 519 error = SYSCTL_IN(req, addrs, sizeof(addrs)); 520 if (error) 521 return (error); 522 if ((error = sa6_embedscope(&addrs[0], V_ip6_use_defzone)) != 0 || 523 (error = sa6_embedscope(&addrs[1], V_ip6_use_defzone)) != 0) { 524 return (error); 525 } 526 INP_INFO_RLOCK(&V_udbinfo); 527 inp = in6_pcblookup_hash(&V_udbinfo, &addrs[1].sin6_addr, 528 addrs[1].sin6_port, &addrs[0].sin6_addr, addrs[0].sin6_port, 1, 529 NULL); 530 if (inp != NULL) { 531 INP_RLOCK(inp); 532 INP_INFO_RUNLOCK(&V_udbinfo); 533 if (inp->inp_socket == NULL) 534 error = ENOENT; 535 if (error == 0) 536 error = cr_canseesocket(req->td->td_ucred, 537 inp->inp_socket); 538 if (error == 0) 539 cru2x(inp->inp_cred, &xuc); 540 INP_RUNLOCK(inp); 541 } else { 542 INP_INFO_RUNLOCK(&V_udbinfo); 543 error = ENOENT; 544 } 545 if (error == 0) 546 error = SYSCTL_OUT(req, &xuc, sizeof(struct xucred)); 547 return (error); 548 } 549 550 SYSCTL_PROC(_net_inet6_udp6, OID_AUTO, getcred, CTLTYPE_OPAQUE|CTLFLAG_RW, 0, 551 0, udp6_getcred, "S,xucred", "Get the xucred of a UDP6 connection"); 552 553 static int 554 udp6_output(struct inpcb *inp, struct mbuf *m, struct sockaddr *addr6, 555 struct mbuf *control, struct thread *td) 556 { 557 INIT_VNET_INET(curvnet); 558 INIT_VNET_INET6(curvnet); 559 u_int32_t ulen = m->m_pkthdr.len; 560 u_int32_t plen = sizeof(struct udphdr) + ulen; 561 struct ip6_hdr *ip6; 562 struct udphdr *udp6; 563 struct in6_addr *laddr, *faddr; 564 struct sockaddr_in6 *sin6 = NULL; 565 struct ifnet *oifp = NULL; 566 int scope_ambiguous = 0; 567 u_short fport; 568 int error = 0; 569 struct ip6_pktopts *optp, opt; 570 int af = AF_INET6, hlen = sizeof(struct ip6_hdr); 571 int flags; 572 struct sockaddr_in6 tmp; 573 574 INP_WLOCK_ASSERT(inp); 575 576 if (addr6) { 577 /* addr6 has been validated in udp6_send(). */ 578 sin6 = (struct sockaddr_in6 *)addr6; 579 580 /* protect *sin6 from overwrites */ 581 tmp = *sin6; 582 sin6 = &tmp; 583 584 /* 585 * Application should provide a proper zone ID or the use of 586 * default zone IDs should be enabled. Unfortunately, some 587 * applications do not behave as it should, so we need a 588 * workaround. Even if an appropriate ID is not determined, 589 * we'll see if we can determine the outgoing interface. If we 590 * can, determine the zone ID based on the interface below. 591 */ 592 if (sin6->sin6_scope_id == 0 && !V_ip6_use_defzone) 593 scope_ambiguous = 1; 594 if ((error = sa6_embedscope(sin6, V_ip6_use_defzone)) != 0) 595 return (error); 596 } 597 598 if (control) { 599 if ((error = ip6_setpktopts(control, &opt, 600 inp->in6p_outputopts, td->td_ucred, IPPROTO_UDP)) != 0) 601 goto release; 602 optp = &opt; 603 } else 604 optp = inp->in6p_outputopts; 605 606 if (sin6) { 607 faddr = &sin6->sin6_addr; 608 609 /* 610 * IPv4 version of udp_output calls in_pcbconnect in this case, 611 * which needs splnet and affects performance. 612 * Since we saw no essential reason for calling in_pcbconnect, 613 * we get rid of such kind of logic, and call in6_selectsrc 614 * and in6_pcbsetport in order to fill in the local address 615 * and the local port. 616 */ 617 if (sin6->sin6_port == 0) { 618 error = EADDRNOTAVAIL; 619 goto release; 620 } 621 622 if (!IN6_IS_ADDR_UNSPECIFIED(&inp->in6p_faddr)) { 623 /* how about ::ffff:0.0.0.0 case? */ 624 error = EISCONN; 625 goto release; 626 } 627 628 fport = sin6->sin6_port; /* allow 0 port */ 629 630 if (IN6_IS_ADDR_V4MAPPED(faddr)) { 631 if ((inp->inp_flags & IN6P_IPV6_V6ONLY)) { 632 /* 633 * I believe we should explicitly discard the 634 * packet when mapped addresses are disabled, 635 * rather than send the packet as an IPv6 one. 636 * If we chose the latter approach, the packet 637 * might be sent out on the wire based on the 638 * default route, the situation which we'd 639 * probably want to avoid. 640 * (20010421 jinmei@kame.net) 641 */ 642 error = EINVAL; 643 goto release; 644 } 645 if (!IN6_IS_ADDR_UNSPECIFIED(&inp->in6p_laddr) && 646 !IN6_IS_ADDR_V4MAPPED(&inp->in6p_laddr)) { 647 /* 648 * when remote addr is an IPv4-mapped address, 649 * local addr should not be an IPv6 address, 650 * since you cannot determine how to map IPv6 651 * source address to IPv4. 652 */ 653 error = EINVAL; 654 goto release; 655 } 656 657 af = AF_INET; 658 } 659 660 if (!IN6_IS_ADDR_V4MAPPED(faddr)) { 661 laddr = in6_selectsrc(sin6, optp, inp, NULL, 662 td->td_ucred, &oifp, &error); 663 if (oifp && scope_ambiguous && 664 (error = in6_setscope(&sin6->sin6_addr, 665 oifp, NULL))) { 666 goto release; 667 } 668 } else 669 laddr = &inp->in6p_laddr; /* XXX */ 670 if (laddr == NULL) { 671 if (error == 0) 672 error = EADDRNOTAVAIL; 673 goto release; 674 } 675 if (inp->inp_lport == 0 && 676 (error = in6_pcbsetport(laddr, inp, td->td_ucred)) != 0) 677 goto release; 678 } else { 679 if (IN6_IS_ADDR_UNSPECIFIED(&inp->in6p_faddr)) { 680 error = ENOTCONN; 681 goto release; 682 } 683 if (IN6_IS_ADDR_V4MAPPED(&inp->in6p_faddr)) { 684 if ((inp->inp_flags & IN6P_IPV6_V6ONLY)) { 685 /* 686 * XXX: this case would happen when the 687 * application sets the V6ONLY flag after 688 * connecting the foreign address. 689 * Such applications should be fixed, 690 * so we bark here. 691 */ 692 log(LOG_INFO, "udp6_output: IPV6_V6ONLY " 693 "option was set for a connected socket\n"); 694 error = EINVAL; 695 goto release; 696 } else 697 af = AF_INET; 698 } 699 laddr = &inp->in6p_laddr; 700 faddr = &inp->in6p_faddr; 701 fport = inp->inp_fport; 702 } 703 704 if (af == AF_INET) 705 hlen = sizeof(struct ip); 706 707 /* 708 * Calculate data length and get a mbuf 709 * for UDP and IP6 headers. 710 */ 711 M_PREPEND(m, hlen + sizeof(struct udphdr), M_DONTWAIT); 712 if (m == 0) { 713 error = ENOBUFS; 714 goto release; 715 } 716 717 /* 718 * Stuff checksum and output datagram. 719 */ 720 udp6 = (struct udphdr *)(mtod(m, caddr_t) + hlen); 721 udp6->uh_sport = inp->inp_lport; /* lport is always set in the PCB */ 722 udp6->uh_dport = fport; 723 if (plen <= 0xffff) 724 udp6->uh_ulen = htons((u_short)plen); 725 else 726 udp6->uh_ulen = 0; 727 udp6->uh_sum = 0; 728 729 switch (af) { 730 case AF_INET6: 731 ip6 = mtod(m, struct ip6_hdr *); 732 ip6->ip6_flow = inp->inp_flow & IPV6_FLOWINFO_MASK; 733 ip6->ip6_vfc &= ~IPV6_VERSION_MASK; 734 ip6->ip6_vfc |= IPV6_VERSION; 735 #if 0 /* ip6_plen will be filled in ip6_output. */ 736 ip6->ip6_plen = htons((u_short)plen); 737 #endif 738 ip6->ip6_nxt = IPPROTO_UDP; 739 ip6->ip6_hlim = in6_selecthlim(inp, NULL); 740 ip6->ip6_src = *laddr; 741 ip6->ip6_dst = *faddr; 742 743 if ((udp6->uh_sum = in6_cksum(m, IPPROTO_UDP, 744 sizeof(struct ip6_hdr), plen)) == 0) { 745 udp6->uh_sum = 0xffff; 746 } 747 748 flags = 0; 749 750 UDPSTAT_INC(udps_opackets); 751 error = ip6_output(m, optp, NULL, flags, inp->in6p_moptions, 752 NULL, inp); 753 break; 754 case AF_INET: 755 error = EAFNOSUPPORT; 756 goto release; 757 } 758 goto releaseopt; 759 760 release: 761 m_freem(m); 762 763 releaseopt: 764 if (control) { 765 ip6_clearpktopts(&opt, -1); 766 m_freem(control); 767 } 768 return (error); 769 } 770 771 static void 772 udp6_abort(struct socket *so) 773 { 774 INIT_VNET_INET(so->so_vnet); 775 struct inpcb *inp; 776 777 inp = sotoinpcb(so); 778 KASSERT(inp != NULL, ("udp6_abort: inp == NULL")); 779 780 #ifdef INET 781 if (inp->inp_vflag & INP_IPV4) { 782 struct pr_usrreqs *pru; 783 784 pru = inetsw[ip_protox[IPPROTO_UDP]].pr_usrreqs; 785 (*pru->pru_abort)(so); 786 return; 787 } 788 #endif 789 790 INP_INFO_WLOCK(&V_udbinfo); 791 INP_WLOCK(inp); 792 if (!IN6_IS_ADDR_UNSPECIFIED(&inp->in6p_faddr)) { 793 in6_pcbdisconnect(inp); 794 inp->in6p_laddr = in6addr_any; 795 soisdisconnected(so); 796 } 797 INP_WUNLOCK(inp); 798 INP_INFO_WUNLOCK(&V_udbinfo); 799 } 800 801 static int 802 udp6_attach(struct socket *so, int proto, struct thread *td) 803 { 804 INIT_VNET_INET(so->so_vnet); 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_INFO_WUNLOCK(&V_udbinfo); 824 inp->inp_vflag |= INP_IPV6; 825 if ((inp->inp_flags & IN6P_IPV6_V6ONLY) == 0) 826 inp->inp_vflag |= INP_IPV4; 827 inp->in6p_hops = -1; /* use kernel default */ 828 inp->in6p_cksum = -1; /* just to be sure */ 829 /* 830 * XXX: ugly!! 831 * IPv4 TTL initialization is necessary for an IPv6 socket as well, 832 * because the socket may be bound to an IPv6 wildcard address, 833 * which may match an IPv4-mapped IPv6 address. 834 */ 835 inp->inp_ip_ttl = V_ip_defttl; 836 INP_WUNLOCK(inp); 837 return (0); 838 } 839 840 static int 841 udp6_bind(struct socket *so, struct sockaddr *nam, struct thread *td) 842 { 843 INIT_VNET_INET(so->so_vnet); 844 struct inpcb *inp; 845 int error; 846 847 inp = sotoinpcb(so); 848 KASSERT(inp != NULL, ("udp6_bind: inp == NULL")); 849 850 INP_INFO_WLOCK(&V_udbinfo); 851 INP_WLOCK(inp); 852 inp->inp_vflag &= ~INP_IPV4; 853 inp->inp_vflag |= INP_IPV6; 854 if ((inp->inp_flags & IN6P_IPV6_V6ONLY) == 0) { 855 struct sockaddr_in6 *sin6_p; 856 857 sin6_p = (struct sockaddr_in6 *)nam; 858 859 if (IN6_IS_ADDR_UNSPECIFIED(&sin6_p->sin6_addr)) 860 inp->inp_vflag |= INP_IPV4; 861 else if (IN6_IS_ADDR_V4MAPPED(&sin6_p->sin6_addr)) { 862 struct sockaddr_in sin; 863 864 in6_sin6_2_sin(&sin, sin6_p); 865 inp->inp_vflag |= INP_IPV4; 866 inp->inp_vflag &= ~INP_IPV6; 867 error = in_pcbbind(inp, (struct sockaddr *)&sin, 868 td->td_ucred); 869 goto out; 870 } 871 } 872 873 error = in6_pcbbind(inp, nam, td->td_ucred); 874 out: 875 INP_WUNLOCK(inp); 876 INP_INFO_WUNLOCK(&V_udbinfo); 877 return (error); 878 } 879 880 static void 881 udp6_close(struct socket *so) 882 { 883 INIT_VNET_INET(so->so_vnet); 884 struct inpcb *inp; 885 886 inp = sotoinpcb(so); 887 KASSERT(inp != NULL, ("udp6_close: inp == NULL")); 888 889 #ifdef INET 890 if (inp->inp_vflag & INP_IPV4) { 891 struct pr_usrreqs *pru; 892 893 pru = inetsw[ip_protox[IPPROTO_UDP]].pr_usrreqs; 894 (*pru->pru_disconnect)(so); 895 return; 896 } 897 #endif 898 INP_INFO_WLOCK(&V_udbinfo); 899 INP_WLOCK(inp); 900 if (!IN6_IS_ADDR_UNSPECIFIED(&inp->in6p_faddr)) { 901 in6_pcbdisconnect(inp); 902 inp->in6p_laddr = in6addr_any; 903 soisdisconnected(so); 904 } 905 INP_WUNLOCK(inp); 906 INP_INFO_WUNLOCK(&V_udbinfo); 907 } 908 909 static int 910 udp6_connect(struct socket *so, struct sockaddr *nam, struct thread *td) 911 { 912 INIT_VNET_INET(so->so_vnet); 913 struct inpcb *inp; 914 struct sockaddr_in6 *sin6; 915 int error; 916 917 inp = sotoinpcb(so); 918 sin6 = (struct sockaddr_in6 *)nam; 919 KASSERT(inp != NULL, ("udp6_connect: inp == NULL")); 920 921 INP_INFO_WLOCK(&V_udbinfo); 922 INP_WLOCK(inp); 923 if ((inp->inp_flags & IN6P_IPV6_V6ONLY) == 0 && 924 IN6_IS_ADDR_V4MAPPED(&sin6->sin6_addr)) { 925 struct sockaddr_in sin; 926 927 if (inp->inp_faddr.s_addr != INADDR_ANY) { 928 error = EISCONN; 929 goto out; 930 } 931 in6_sin6_2_sin(&sin, sin6); 932 error = prison_remote_ip4(td->td_ucred, &sin.sin_addr); 933 if (error != 0) 934 goto out; 935 error = in_pcbconnect(inp, (struct sockaddr *)&sin, 936 td->td_ucred); 937 if (error == 0) { 938 inp->inp_vflag |= INP_IPV4; 939 inp->inp_vflag &= ~INP_IPV6; 940 soisconnected(so); 941 } 942 goto out; 943 } 944 if (!IN6_IS_ADDR_UNSPECIFIED(&inp->in6p_faddr)) { 945 error = EISCONN; 946 goto out; 947 } 948 error = prison_remote_ip6(td->td_ucred, &sin6->sin6_addr); 949 if (error != 0) 950 goto out; 951 error = in6_pcbconnect(inp, nam, td->td_ucred); 952 if (error == 0) { 953 if ((inp->inp_flags & IN6P_IPV6_V6ONLY) == 0) { 954 /* should be non mapped addr */ 955 inp->inp_vflag &= ~INP_IPV4; 956 inp->inp_vflag |= INP_IPV6; 957 } 958 soisconnected(so); 959 } 960 out: 961 INP_WUNLOCK(inp); 962 INP_INFO_WUNLOCK(&V_udbinfo); 963 return (error); 964 } 965 966 static void 967 udp6_detach(struct socket *so) 968 { 969 INIT_VNET_INET(so->so_vnet); 970 struct inpcb *inp; 971 972 inp = sotoinpcb(so); 973 KASSERT(inp != NULL, ("udp6_detach: inp == NULL")); 974 975 INP_INFO_WLOCK(&V_udbinfo); 976 INP_WLOCK(inp); 977 in_pcbdetach(inp); 978 in_pcbfree(inp); 979 INP_INFO_WUNLOCK(&V_udbinfo); 980 } 981 982 static int 983 udp6_disconnect(struct socket *so) 984 { 985 INIT_VNET_INET(so->so_vnet); 986 struct inpcb *inp; 987 int error; 988 989 inp = sotoinpcb(so); 990 KASSERT(inp != NULL, ("udp6_disconnect: inp == NULL")); 991 992 INP_INFO_WLOCK(&V_udbinfo); 993 INP_WLOCK(inp); 994 995 #ifdef INET 996 if (inp->inp_vflag & INP_IPV4) { 997 struct pr_usrreqs *pru; 998 999 pru = inetsw[ip_protox[IPPROTO_UDP]].pr_usrreqs; 1000 error = (*pru->pru_disconnect)(so); 1001 goto out; 1002 } 1003 #endif 1004 1005 if (IN6_IS_ADDR_UNSPECIFIED(&inp->in6p_faddr)) { 1006 error = ENOTCONN; 1007 goto out; 1008 } 1009 1010 in6_pcbdisconnect(inp); 1011 inp->in6p_laddr = in6addr_any; 1012 SOCK_LOCK(so); 1013 so->so_state &= ~SS_ISCONNECTED; /* XXX */ 1014 SOCK_UNLOCK(so); 1015 out: 1016 INP_WUNLOCK(inp); 1017 INP_INFO_WUNLOCK(&V_udbinfo); 1018 return (0); 1019 } 1020 1021 static int 1022 udp6_send(struct socket *so, int flags, struct mbuf *m, 1023 struct sockaddr *addr, struct mbuf *control, struct thread *td) 1024 { 1025 INIT_VNET_INET(so->so_vnet); 1026 struct inpcb *inp; 1027 int error = 0; 1028 1029 inp = sotoinpcb(so); 1030 KASSERT(inp != NULL, ("udp6_send: inp == NULL")); 1031 1032 INP_INFO_WLOCK(&V_udbinfo); 1033 INP_WLOCK(inp); 1034 if (addr) { 1035 if (addr->sa_len != sizeof(struct sockaddr_in6)) { 1036 error = EINVAL; 1037 goto bad; 1038 } 1039 if (addr->sa_family != AF_INET6) { 1040 error = EAFNOSUPPORT; 1041 goto bad; 1042 } 1043 } 1044 1045 #ifdef INET 1046 if ((inp->inp_flags & IN6P_IPV6_V6ONLY) == 0) { 1047 int hasv4addr; 1048 struct sockaddr_in6 *sin6 = 0; 1049 1050 if (addr == 0) 1051 hasv4addr = (inp->inp_vflag & INP_IPV4); 1052 else { 1053 sin6 = (struct sockaddr_in6 *)addr; 1054 hasv4addr = IN6_IS_ADDR_V4MAPPED(&sin6->sin6_addr) 1055 ? 1 : 0; 1056 } 1057 if (hasv4addr) { 1058 struct pr_usrreqs *pru; 1059 1060 if (!IN6_IS_ADDR_UNSPECIFIED(&inp->in6p_laddr) && 1061 !IN6_IS_ADDR_V4MAPPED(&inp->in6p_laddr)) { 1062 /* 1063 * When remote addr is IPv4-mapped address, 1064 * local addr should not be an IPv6 address; 1065 * since you cannot determine how to map IPv6 1066 * source address to IPv4. 1067 */ 1068 error = EINVAL; 1069 goto out; 1070 } 1071 1072 /* 1073 * XXXRW: We release UDP-layer locks before calling 1074 * udp_send() in order to avoid recursion. However, 1075 * this does mean there is a short window where inp's 1076 * fields are unstable. Could this lead to a 1077 * potential race in which the factors causing us to 1078 * select the UDPv4 output routine are invalidated? 1079 */ 1080 INP_WUNLOCK(inp); 1081 INP_INFO_WUNLOCK(&V_udbinfo); 1082 if (sin6) 1083 in6_sin6_2_sin_in_sock(addr); 1084 pru = inetsw[ip_protox[IPPROTO_UDP]].pr_usrreqs; 1085 /* addr will just be freed in sendit(). */ 1086 return ((*pru->pru_send)(so, flags, m, addr, control, 1087 td)); 1088 } 1089 } 1090 #endif 1091 #ifdef MAC 1092 mac_inpcb_create_mbuf(inp, m); 1093 #endif 1094 error = udp6_output(inp, m, addr, control, td); 1095 out: 1096 INP_WUNLOCK(inp); 1097 INP_INFO_WUNLOCK(&V_udbinfo); 1098 return (error); 1099 1100 bad: 1101 INP_WUNLOCK(inp); 1102 INP_INFO_WUNLOCK(&V_udbinfo); 1103 m_freem(m); 1104 return (error); 1105 } 1106 1107 struct pr_usrreqs udp6_usrreqs = { 1108 .pru_abort = udp6_abort, 1109 .pru_attach = udp6_attach, 1110 .pru_bind = udp6_bind, 1111 .pru_connect = udp6_connect, 1112 .pru_control = in6_control, 1113 .pru_detach = udp6_detach, 1114 .pru_disconnect = udp6_disconnect, 1115 .pru_peeraddr = in6_mapped_peeraddr, 1116 .pru_send = udp6_send, 1117 .pru_shutdown = udp_shutdown, 1118 .pru_sockaddr = in6_mapped_sockaddr, 1119 .pru_soreceive = soreceive_dgram, 1120 .pru_sosend = sosend_dgram, 1121 .pru_sosetlabel = in_pcbsosetlabel, 1122 .pru_close = udp6_close 1123 }; 1124