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 72 #include <sys/param.h> 73 #include <sys/jail.h> 74 #include <sys/kernel.h> 75 #include <sys/lock.h> 76 #include <sys/mbuf.h> 77 #include <sys/priv.h> 78 #include <sys/proc.h> 79 #include <sys/protosw.h> 80 #include <sys/signalvar.h> 81 #include <sys/socket.h> 82 #include <sys/socketvar.h> 83 #include <sys/sx.h> 84 #include <sys/sysctl.h> 85 #include <sys/syslog.h> 86 #include <sys/systm.h> 87 88 #include <net/if.h> 89 #include <net/if_types.h> 90 #include <net/route.h> 91 92 #include <netinet/in.h> 93 #include <netinet/in_pcb.h> 94 #include <netinet/in_systm.h> 95 #include <netinet/in_var.h> 96 #include <netinet/ip.h> 97 #include <netinet/ip_icmp.h> 98 #include <netinet/ip6.h> 99 #include <netinet/icmp_var.h> 100 #include <netinet/icmp6.h> 101 #include <netinet/ip_var.h> 102 #include <netinet/udp.h> 103 #include <netinet/udp_var.h> 104 105 #include <netinet6/ip6protosw.h> 106 #include <netinet6/ip6_var.h> 107 #include <netinet6/in6_pcb.h> 108 #include <netinet6/udp6_var.h> 109 #include <netinet6/scope6_var.h> 110 111 #ifdef IPSEC 112 #include <netipsec/ipsec.h> 113 #include <netipsec/ipsec6.h> 114 #endif /* IPSEC */ 115 116 #include <security/mac/mac_framework.h> 117 118 /* 119 * UDP protocol implementation. 120 * Per RFC 768, August, 1980. 121 */ 122 123 extern struct protosw inetsw[]; 124 static void udp6_detach(struct socket *so); 125 126 static void 127 udp6_append(struct inpcb *inp, struct mbuf *n, int off, 128 struct sockaddr_in6 *fromsa) 129 { 130 struct socket *so; 131 struct mbuf *opts; 132 133 INP_LOCK_ASSERT(inp); 134 135 #ifdef IPSEC 136 /* Check AH/ESP integrity. */ 137 if (ipsec6_in_reject(n, inp)) { 138 m_freem(n); 139 V_ipsec6stat.in_polvio++; 140 return; 141 } 142 #endif /* IPSEC */ 143 #ifdef MAC 144 if (mac_inpcb_check_deliver(inp, n) != 0) { 145 m_freem(n); 146 return; 147 } 148 #endif 149 opts = NULL; 150 if (inp->inp_flags & INP_CONTROLOPTS || 151 inp->inp_socket->so_options & SO_TIMESTAMP) 152 ip6_savecontrol(inp, n, &opts); 153 m_adj(n, off + sizeof(struct udphdr)); 154 155 so = inp->inp_socket; 156 SOCKBUF_LOCK(&so->so_rcv); 157 if (sbappendaddr_locked(&so->so_rcv, (struct sockaddr *)fromsa, n, 158 opts) == 0) { 159 SOCKBUF_UNLOCK(&so->so_rcv); 160 m_freem(n); 161 if (opts) 162 m_freem(opts); 163 UDPSTAT_INC(udps_fullsock); 164 } else 165 sorwakeup_locked(so); 166 } 167 168 int 169 udp6_input(struct mbuf **mp, int *offp, int proto) 170 { 171 struct mbuf *m = *mp; 172 struct ifnet *ifp; 173 struct ip6_hdr *ip6; 174 struct udphdr *uh; 175 struct inpcb *inp; 176 struct udpcb *up; 177 int off = *offp; 178 int plen, ulen; 179 struct sockaddr_in6 fromsa; 180 181 ifp = m->m_pkthdr.rcvif; 182 ip6 = mtod(m, struct ip6_hdr *); 183 184 if (faithprefix_p != NULL && (*faithprefix_p)(&ip6->ip6_dst)) { 185 /* XXX send icmp6 host/port unreach? */ 186 m_freem(m); 187 return (IPPROTO_DONE); 188 } 189 190 #ifndef PULLDOWN_TEST 191 IP6_EXTHDR_CHECK(m, off, sizeof(struct udphdr), IPPROTO_DONE); 192 ip6 = mtod(m, struct ip6_hdr *); 193 uh = (struct udphdr *)((caddr_t)ip6 + off); 194 #else 195 IP6_EXTHDR_GET(uh, struct udphdr *, m, off, sizeof(*uh)); 196 if (!uh) 197 return (IPPROTO_DONE); 198 #endif 199 200 UDPSTAT_INC(udps_ipackets); 201 202 /* 203 * Destination port of 0 is illegal, based on RFC768. 204 */ 205 if (uh->uh_dport == 0) 206 goto badunlocked; 207 208 plen = ntohs(ip6->ip6_plen) - off + sizeof(*ip6); 209 ulen = ntohs((u_short)uh->uh_ulen); 210 211 if (plen != ulen) { 212 UDPSTAT_INC(udps_badlen); 213 goto badunlocked; 214 } 215 216 /* 217 * Checksum extended UDP header and data. 218 */ 219 if (uh->uh_sum == 0) { 220 UDPSTAT_INC(udps_nosum); 221 goto badunlocked; 222 } 223 if (in6_cksum(m, IPPROTO_UDP, off, ulen) != 0) { 224 UDPSTAT_INC(udps_badsum); 225 goto badunlocked; 226 } 227 228 /* 229 * Construct sockaddr format source address. 230 */ 231 init_sin6(&fromsa, m); 232 fromsa.sin6_port = uh->uh_sport; 233 234 INP_INFO_RLOCK(&V_udbinfo); 235 if (IN6_IS_ADDR_MULTICAST(&ip6->ip6_dst)) { 236 struct inpcb *last; 237 struct ip6_moptions *imo; 238 239 /* 240 * In the event that laddr should be set to the link-local 241 * address (this happens in RIPng), the multicast address 242 * specified in the received packet will not match laddr. To 243 * handle this situation, matching is relaxed if the 244 * receiving interface is the same as one specified in the 245 * socket and if the destination multicast address matches 246 * one of the multicast groups specified in the socket. 247 */ 248 249 /* 250 * KAME note: traditionally we dropped udpiphdr from mbuf 251 * here. We need udphdr for IPsec processing so we do that 252 * later. 253 */ 254 last = NULL; 255 LIST_FOREACH(inp, &V_udb, inp_list) { 256 if ((inp->inp_vflag & INP_IPV6) == 0) 257 continue; 258 if (inp->inp_lport != uh->uh_dport) 259 continue; 260 if (inp->inp_fport != 0 && 261 inp->inp_fport != uh->uh_sport) 262 continue; 263 if (!IN6_IS_ADDR_UNSPECIFIED(&inp->in6p_laddr)) { 264 if (!IN6_ARE_ADDR_EQUAL(&inp->in6p_laddr, 265 &ip6->ip6_dst)) 266 continue; 267 } 268 if (!IN6_IS_ADDR_UNSPECIFIED(&inp->in6p_faddr)) { 269 if (!IN6_ARE_ADDR_EQUAL(&inp->in6p_faddr, 270 &ip6->ip6_src) || 271 inp->inp_fport != uh->uh_sport) 272 continue; 273 } 274 275 /* 276 * Handle socket delivery policy for any-source 277 * and source-specific multicast. [RFC3678] 278 */ 279 imo = inp->in6p_moptions; 280 if (imo && IN6_IS_ADDR_MULTICAST(&ip6->ip6_dst)) { 281 struct sockaddr_in6 mcaddr; 282 int blocked; 283 284 INP_RLOCK(inp); 285 286 bzero(&mcaddr, sizeof(struct sockaddr_in6)); 287 mcaddr.sin6_len = sizeof(struct sockaddr_in6); 288 mcaddr.sin6_family = AF_INET6; 289 mcaddr.sin6_addr = ip6->ip6_dst; 290 291 blocked = im6o_mc_filter(imo, ifp, 292 (struct sockaddr *)&mcaddr, 293 (struct sockaddr *)&fromsa); 294 if (blocked != MCAST_PASS) { 295 if (blocked == MCAST_NOTGMEMBER) 296 IP6STAT_INC(ip6s_notmember); 297 if (blocked == MCAST_NOTSMEMBER || 298 blocked == MCAST_MUTED) 299 UDPSTAT_INC(udps_filtermcast); 300 INP_RUNLOCK(inp); /* XXX */ 301 continue; 302 } 303 304 INP_RUNLOCK(inp); 305 } 306 if (last != NULL) { 307 struct mbuf *n; 308 309 if ((n = m_copy(m, 0, M_COPYALL)) != NULL) { 310 INP_RLOCK(last); 311 up = intoudpcb(last); 312 if (up->u_tun_func == NULL) { 313 udp6_append(last, n, off, &fromsa); 314 } else { 315 /* 316 * Engage the tunneling 317 * protocol we will have to 318 * leave the info_lock up, 319 * since we are hunting 320 * through multiple UDP's. 321 * 322 */ 323 (*up->u_tun_func)(n, off, last); 324 } 325 INP_RUNLOCK(last); 326 } 327 } 328 last = inp; 329 /* 330 * Don't look for additional matches if this one does 331 * not have either the SO_REUSEPORT or SO_REUSEADDR 332 * socket options set. This heuristic avoids 333 * searching through all pcbs in the common case of a 334 * non-shared port. It assumes that an application 335 * will never clear these options after setting them. 336 */ 337 if ((last->inp_socket->so_options & 338 (SO_REUSEPORT|SO_REUSEADDR)) == 0) 339 break; 340 } 341 342 if (last == NULL) { 343 /* 344 * No matching pcb found; discard datagram. (No need 345 * to send an ICMP Port Unreachable for a broadcast 346 * or multicast datgram.) 347 */ 348 UDPSTAT_INC(udps_noport); 349 UDPSTAT_INC(udps_noportmcast); 350 goto badheadlocked; 351 } 352 INP_RLOCK(last); 353 INP_INFO_RUNLOCK(&V_udbinfo); 354 up = intoudpcb(last); 355 if (up->u_tun_func == NULL) { 356 udp6_append(last, m, off, &fromsa); 357 } else { 358 /* 359 * Engage the tunneling protocol. 360 */ 361 (*up->u_tun_func)(m, off, last); 362 } 363 INP_RUNLOCK(last); 364 return (IPPROTO_DONE); 365 } 366 /* 367 * Locate pcb for datagram. 368 */ 369 inp = in6_pcblookup_hash(&V_udbinfo, &ip6->ip6_src, uh->uh_sport, 370 &ip6->ip6_dst, uh->uh_dport, 1, m->m_pkthdr.rcvif); 371 if (inp == NULL) { 372 if (udp_log_in_vain) { 373 char ip6bufs[INET6_ADDRSTRLEN]; 374 char ip6bufd[INET6_ADDRSTRLEN]; 375 376 log(LOG_INFO, 377 "Connection attempt to UDP [%s]:%d from [%s]:%d\n", 378 ip6_sprintf(ip6bufd, &ip6->ip6_dst), 379 ntohs(uh->uh_dport), 380 ip6_sprintf(ip6bufs, &ip6->ip6_src), 381 ntohs(uh->uh_sport)); 382 } 383 UDPSTAT_INC(udps_noport); 384 if (m->m_flags & M_MCAST) { 385 printf("UDP6: M_MCAST is set in a unicast packet.\n"); 386 UDPSTAT_INC(udps_noportmcast); 387 goto badheadlocked; 388 } 389 INP_INFO_RUNLOCK(&V_udbinfo); 390 if (V_udp_blackhole) 391 goto badunlocked; 392 if (badport_bandlim(BANDLIM_ICMP6_UNREACH) < 0) 393 goto badunlocked; 394 icmp6_error(m, ICMP6_DST_UNREACH, ICMP6_DST_UNREACH_NOPORT, 0); 395 return (IPPROTO_DONE); 396 } 397 INP_RLOCK(inp); 398 INP_INFO_RUNLOCK(&V_udbinfo); 399 up = intoudpcb(inp); 400 if (up->u_tun_func == NULL) { 401 udp6_append(inp, m, off, &fromsa); 402 } else { 403 /* 404 * Engage the tunneling protocol. 405 */ 406 407 (*up->u_tun_func)(m, off, inp); 408 } 409 INP_RUNLOCK(inp); 410 return (IPPROTO_DONE); 411 412 badheadlocked: 413 INP_INFO_RUNLOCK(&V_udbinfo); 414 badunlocked: 415 if (m) 416 m_freem(m); 417 return (IPPROTO_DONE); 418 } 419 420 void 421 udp6_ctlinput(int cmd, struct sockaddr *sa, void *d) 422 { 423 struct udphdr uh; 424 struct ip6_hdr *ip6; 425 struct mbuf *m; 426 int off = 0; 427 struct ip6ctlparam *ip6cp = NULL; 428 const struct sockaddr_in6 *sa6_src = NULL; 429 void *cmdarg; 430 struct inpcb *(*notify)(struct inpcb *, int) = udp_notify; 431 struct udp_portonly { 432 u_int16_t uh_sport; 433 u_int16_t uh_dport; 434 } *uhp; 435 436 if (sa->sa_family != AF_INET6 || 437 sa->sa_len != sizeof(struct sockaddr_in6)) 438 return; 439 440 if ((unsigned)cmd >= PRC_NCMDS) 441 return; 442 if (PRC_IS_REDIRECT(cmd)) 443 notify = in6_rtchange, d = NULL; 444 else if (cmd == PRC_HOSTDEAD) 445 d = NULL; 446 else if (inet6ctlerrmap[cmd] == 0) 447 return; 448 449 /* if the parameter is from icmp6, decode it. */ 450 if (d != NULL) { 451 ip6cp = (struct ip6ctlparam *)d; 452 m = ip6cp->ip6c_m; 453 ip6 = ip6cp->ip6c_ip6; 454 off = ip6cp->ip6c_off; 455 cmdarg = ip6cp->ip6c_cmdarg; 456 sa6_src = ip6cp->ip6c_src; 457 } else { 458 m = NULL; 459 ip6 = NULL; 460 cmdarg = NULL; 461 sa6_src = &sa6_any; 462 } 463 464 if (ip6) { 465 /* 466 * XXX: We assume that when IPV6 is non NULL, 467 * M and OFF are valid. 468 */ 469 470 /* Check if we can safely examine src and dst ports. */ 471 if (m->m_pkthdr.len < off + sizeof(*uhp)) 472 return; 473 474 bzero(&uh, sizeof(uh)); 475 m_copydata(m, off, sizeof(*uhp), (caddr_t)&uh); 476 477 (void) in6_pcbnotify(&V_udbinfo, sa, uh.uh_dport, 478 (struct sockaddr *)ip6cp->ip6c_src, uh.uh_sport, cmd, 479 cmdarg, notify); 480 } else 481 (void) in6_pcbnotify(&V_udbinfo, sa, 0, 482 (const struct sockaddr *)sa6_src, 0, cmd, cmdarg, notify); 483 } 484 485 static int 486 udp6_getcred(SYSCTL_HANDLER_ARGS) 487 { 488 struct xucred xuc; 489 struct sockaddr_in6 addrs[2]; 490 struct inpcb *inp; 491 int error; 492 493 error = priv_check(req->td, PRIV_NETINET_GETCRED); 494 if (error) 495 return (error); 496 497 if (req->newlen != sizeof(addrs)) 498 return (EINVAL); 499 if (req->oldlen != sizeof(struct xucred)) 500 return (EINVAL); 501 error = SYSCTL_IN(req, addrs, sizeof(addrs)); 502 if (error) 503 return (error); 504 if ((error = sa6_embedscope(&addrs[0], V_ip6_use_defzone)) != 0 || 505 (error = sa6_embedscope(&addrs[1], V_ip6_use_defzone)) != 0) { 506 return (error); 507 } 508 INP_INFO_RLOCK(&V_udbinfo); 509 inp = in6_pcblookup_hash(&V_udbinfo, &addrs[1].sin6_addr, 510 addrs[1].sin6_port, &addrs[0].sin6_addr, addrs[0].sin6_port, 1, 511 NULL); 512 if (inp != NULL) { 513 INP_RLOCK(inp); 514 INP_INFO_RUNLOCK(&V_udbinfo); 515 if (inp->inp_socket == NULL) 516 error = ENOENT; 517 if (error == 0) 518 error = cr_canseesocket(req->td->td_ucred, 519 inp->inp_socket); 520 if (error == 0) 521 cru2x(inp->inp_cred, &xuc); 522 INP_RUNLOCK(inp); 523 } else { 524 INP_INFO_RUNLOCK(&V_udbinfo); 525 error = ENOENT; 526 } 527 if (error == 0) 528 error = SYSCTL_OUT(req, &xuc, sizeof(struct xucred)); 529 return (error); 530 } 531 532 SYSCTL_PROC(_net_inet6_udp6, OID_AUTO, getcred, CTLTYPE_OPAQUE|CTLFLAG_RW, 0, 533 0, udp6_getcred, "S,xucred", "Get the xucred of a UDP6 connection"); 534 535 static int 536 udp6_output(struct inpcb *inp, struct mbuf *m, struct sockaddr *addr6, 537 struct mbuf *control, struct thread *td) 538 { 539 u_int32_t ulen = m->m_pkthdr.len; 540 u_int32_t plen = sizeof(struct udphdr) + ulen; 541 struct ip6_hdr *ip6; 542 struct udphdr *udp6; 543 struct in6_addr *laddr, *faddr, in6a; 544 struct sockaddr_in6 *sin6 = NULL; 545 struct ifnet *oifp = NULL; 546 int scope_ambiguous = 0; 547 u_short fport; 548 int error = 0; 549 struct ip6_pktopts *optp, opt; 550 int af = AF_INET6, hlen = sizeof(struct ip6_hdr); 551 int flags; 552 struct sockaddr_in6 tmp; 553 554 INP_WLOCK_ASSERT(inp); 555 556 if (addr6) { 557 /* addr6 has been validated in udp6_send(). */ 558 sin6 = (struct sockaddr_in6 *)addr6; 559 560 /* protect *sin6 from overwrites */ 561 tmp = *sin6; 562 sin6 = &tmp; 563 564 /* 565 * Application should provide a proper zone ID or the use of 566 * default zone IDs should be enabled. Unfortunately, some 567 * applications do not behave as it should, so we need a 568 * workaround. Even if an appropriate ID is not determined, 569 * we'll see if we can determine the outgoing interface. If we 570 * can, determine the zone ID based on the interface below. 571 */ 572 if (sin6->sin6_scope_id == 0 && !V_ip6_use_defzone) 573 scope_ambiguous = 1; 574 if ((error = sa6_embedscope(sin6, V_ip6_use_defzone)) != 0) 575 return (error); 576 } 577 578 if (control) { 579 if ((error = ip6_setpktopts(control, &opt, 580 inp->in6p_outputopts, td->td_ucred, IPPROTO_UDP)) != 0) 581 goto release; 582 optp = &opt; 583 } else 584 optp = inp->in6p_outputopts; 585 586 if (sin6) { 587 faddr = &sin6->sin6_addr; 588 589 /* 590 * IPv4 version of udp_output calls in_pcbconnect in this case, 591 * which needs splnet and affects performance. 592 * Since we saw no essential reason for calling in_pcbconnect, 593 * we get rid of such kind of logic, and call in6_selectsrc 594 * and in6_pcbsetport in order to fill in the local address 595 * and the local port. 596 */ 597 if (sin6->sin6_port == 0) { 598 error = EADDRNOTAVAIL; 599 goto release; 600 } 601 602 if (!IN6_IS_ADDR_UNSPECIFIED(&inp->in6p_faddr)) { 603 /* how about ::ffff:0.0.0.0 case? */ 604 error = EISCONN; 605 goto release; 606 } 607 608 fport = sin6->sin6_port; /* allow 0 port */ 609 610 if (IN6_IS_ADDR_V4MAPPED(faddr)) { 611 if ((inp->inp_flags & IN6P_IPV6_V6ONLY)) { 612 /* 613 * I believe we should explicitly discard the 614 * packet when mapped addresses are disabled, 615 * rather than send the packet as an IPv6 one. 616 * If we chose the latter approach, the packet 617 * might be sent out on the wire based on the 618 * default route, the situation which we'd 619 * probably want to avoid. 620 * (20010421 jinmei@kame.net) 621 */ 622 error = EINVAL; 623 goto release; 624 } 625 if (!IN6_IS_ADDR_UNSPECIFIED(&inp->in6p_laddr) && 626 !IN6_IS_ADDR_V4MAPPED(&inp->in6p_laddr)) { 627 /* 628 * when remote addr is an IPv4-mapped address, 629 * local addr should not be an IPv6 address, 630 * since you cannot determine how to map IPv6 631 * source address to IPv4. 632 */ 633 error = EINVAL; 634 goto release; 635 } 636 637 af = AF_INET; 638 } 639 640 if (!IN6_IS_ADDR_V4MAPPED(faddr)) { 641 error = in6_selectsrc(sin6, optp, inp, NULL, 642 td->td_ucred, &oifp, &in6a); 643 if (error) 644 goto release; 645 if (oifp && scope_ambiguous && 646 (error = in6_setscope(&sin6->sin6_addr, 647 oifp, NULL))) { 648 goto release; 649 } 650 laddr = &in6a; 651 } else 652 laddr = &inp->in6p_laddr; /* XXX */ 653 if (laddr == NULL) { 654 if (error == 0) 655 error = EADDRNOTAVAIL; 656 goto release; 657 } 658 if (inp->inp_lport == 0 && 659 (error = in6_pcbsetport(laddr, inp, td->td_ucred)) != 0) 660 goto release; 661 } else { 662 if (IN6_IS_ADDR_UNSPECIFIED(&inp->in6p_faddr)) { 663 error = ENOTCONN; 664 goto release; 665 } 666 if (IN6_IS_ADDR_V4MAPPED(&inp->in6p_faddr)) { 667 if ((inp->inp_flags & IN6P_IPV6_V6ONLY)) { 668 /* 669 * XXX: this case would happen when the 670 * application sets the V6ONLY flag after 671 * connecting the foreign address. 672 * Such applications should be fixed, 673 * so we bark here. 674 */ 675 log(LOG_INFO, "udp6_output: IPV6_V6ONLY " 676 "option was set for a connected socket\n"); 677 error = EINVAL; 678 goto release; 679 } else 680 af = AF_INET; 681 } 682 laddr = &inp->in6p_laddr; 683 faddr = &inp->in6p_faddr; 684 fport = inp->inp_fport; 685 } 686 687 if (af == AF_INET) 688 hlen = sizeof(struct ip); 689 690 /* 691 * Calculate data length and get a mbuf 692 * for UDP and IP6 headers. 693 */ 694 M_PREPEND(m, hlen + sizeof(struct udphdr), M_DONTWAIT); 695 if (m == 0) { 696 error = ENOBUFS; 697 goto release; 698 } 699 700 /* 701 * Stuff checksum and output datagram. 702 */ 703 udp6 = (struct udphdr *)(mtod(m, caddr_t) + hlen); 704 udp6->uh_sport = inp->inp_lport; /* lport is always set in the PCB */ 705 udp6->uh_dport = fport; 706 if (plen <= 0xffff) 707 udp6->uh_ulen = htons((u_short)plen); 708 else 709 udp6->uh_ulen = 0; 710 udp6->uh_sum = 0; 711 712 switch (af) { 713 case AF_INET6: 714 ip6 = mtod(m, struct ip6_hdr *); 715 ip6->ip6_flow = inp->inp_flow & IPV6_FLOWINFO_MASK; 716 ip6->ip6_vfc &= ~IPV6_VERSION_MASK; 717 ip6->ip6_vfc |= IPV6_VERSION; 718 #if 0 /* ip6_plen will be filled in ip6_output. */ 719 ip6->ip6_plen = htons((u_short)plen); 720 #endif 721 ip6->ip6_nxt = IPPROTO_UDP; 722 ip6->ip6_hlim = in6_selecthlim(inp, NULL); 723 ip6->ip6_src = *laddr; 724 ip6->ip6_dst = *faddr; 725 726 if ((udp6->uh_sum = in6_cksum(m, IPPROTO_UDP, 727 sizeof(struct ip6_hdr), plen)) == 0) { 728 udp6->uh_sum = 0xffff; 729 } 730 731 flags = 0; 732 733 UDPSTAT_INC(udps_opackets); 734 error = ip6_output(m, optp, NULL, flags, inp->in6p_moptions, 735 NULL, inp); 736 break; 737 case AF_INET: 738 error = EAFNOSUPPORT; 739 goto release; 740 } 741 goto releaseopt; 742 743 release: 744 m_freem(m); 745 746 releaseopt: 747 if (control) { 748 ip6_clearpktopts(&opt, -1); 749 m_freem(control); 750 } 751 return (error); 752 } 753 754 static void 755 udp6_abort(struct socket *so) 756 { 757 struct inpcb *inp; 758 759 inp = sotoinpcb(so); 760 KASSERT(inp != NULL, ("udp6_abort: inp == NULL")); 761 762 #ifdef INET 763 if (inp->inp_vflag & INP_IPV4) { 764 struct pr_usrreqs *pru; 765 766 pru = inetsw[ip_protox[IPPROTO_UDP]].pr_usrreqs; 767 (*pru->pru_abort)(so); 768 return; 769 } 770 #endif 771 772 INP_INFO_WLOCK(&V_udbinfo); 773 INP_WLOCK(inp); 774 if (!IN6_IS_ADDR_UNSPECIFIED(&inp->in6p_faddr)) { 775 in6_pcbdisconnect(inp); 776 inp->in6p_laddr = in6addr_any; 777 soisdisconnected(so); 778 } 779 INP_WUNLOCK(inp); 780 INP_INFO_WUNLOCK(&V_udbinfo); 781 } 782 783 static int 784 udp6_attach(struct socket *so, int proto, struct thread *td) 785 { 786 struct inpcb *inp; 787 int error; 788 789 inp = sotoinpcb(so); 790 KASSERT(inp == NULL, ("udp6_attach: inp != NULL")); 791 792 if (so->so_snd.sb_hiwat == 0 || so->so_rcv.sb_hiwat == 0) { 793 error = soreserve(so, udp_sendspace, udp_recvspace); 794 if (error) 795 return (error); 796 } 797 INP_INFO_WLOCK(&V_udbinfo); 798 error = in_pcballoc(so, &V_udbinfo); 799 if (error) { 800 INP_INFO_WUNLOCK(&V_udbinfo); 801 return (error); 802 } 803 inp = (struct inpcb *)so->so_pcb; 804 inp->inp_vflag |= INP_IPV6; 805 if ((inp->inp_flags & IN6P_IPV6_V6ONLY) == 0) 806 inp->inp_vflag |= INP_IPV4; 807 inp->in6p_hops = -1; /* use kernel default */ 808 inp->in6p_cksum = -1; /* just to be sure */ 809 /* 810 * XXX: ugly!! 811 * IPv4 TTL initialization is necessary for an IPv6 socket as well, 812 * because the socket may be bound to an IPv6 wildcard address, 813 * which may match an IPv4-mapped IPv6 address. 814 */ 815 inp->inp_ip_ttl = V_ip_defttl; 816 817 error = udp_newudpcb(inp); 818 if (error) { 819 in_pcbdetach(inp); 820 in_pcbfree(inp); 821 INP_INFO_WUNLOCK(&V_udbinfo); 822 return (error); 823 } 824 INP_WUNLOCK(inp); 825 INP_INFO_WUNLOCK(&V_udbinfo); 826 return (0); 827 } 828 829 static int 830 udp6_bind(struct socket *so, struct sockaddr *nam, struct thread *td) 831 { 832 struct inpcb *inp; 833 int error; 834 835 inp = sotoinpcb(so); 836 KASSERT(inp != NULL, ("udp6_bind: inp == NULL")); 837 838 INP_INFO_WLOCK(&V_udbinfo); 839 INP_WLOCK(inp); 840 inp->inp_vflag &= ~INP_IPV4; 841 inp->inp_vflag |= INP_IPV6; 842 if ((inp->inp_flags & IN6P_IPV6_V6ONLY) == 0) { 843 struct sockaddr_in6 *sin6_p; 844 845 sin6_p = (struct sockaddr_in6 *)nam; 846 847 if (IN6_IS_ADDR_UNSPECIFIED(&sin6_p->sin6_addr)) 848 inp->inp_vflag |= INP_IPV4; 849 else if (IN6_IS_ADDR_V4MAPPED(&sin6_p->sin6_addr)) { 850 struct sockaddr_in sin; 851 852 in6_sin6_2_sin(&sin, sin6_p); 853 inp->inp_vflag |= INP_IPV4; 854 inp->inp_vflag &= ~INP_IPV6; 855 error = in_pcbbind(inp, (struct sockaddr *)&sin, 856 td->td_ucred); 857 goto out; 858 } 859 } 860 861 error = in6_pcbbind(inp, nam, td->td_ucred); 862 out: 863 INP_WUNLOCK(inp); 864 INP_INFO_WUNLOCK(&V_udbinfo); 865 return (error); 866 } 867 868 static void 869 udp6_close(struct socket *so) 870 { 871 struct inpcb *inp; 872 873 inp = sotoinpcb(so); 874 KASSERT(inp != NULL, ("udp6_close: inp == NULL")); 875 876 #ifdef INET 877 if (inp->inp_vflag & INP_IPV4) { 878 struct pr_usrreqs *pru; 879 880 pru = inetsw[ip_protox[IPPROTO_UDP]].pr_usrreqs; 881 (*pru->pru_disconnect)(so); 882 return; 883 } 884 #endif 885 INP_INFO_WLOCK(&V_udbinfo); 886 INP_WLOCK(inp); 887 if (!IN6_IS_ADDR_UNSPECIFIED(&inp->in6p_faddr)) { 888 in6_pcbdisconnect(inp); 889 inp->in6p_laddr = in6addr_any; 890 soisdisconnected(so); 891 } 892 INP_WUNLOCK(inp); 893 INP_INFO_WUNLOCK(&V_udbinfo); 894 } 895 896 static int 897 udp6_connect(struct socket *so, struct sockaddr *nam, struct thread *td) 898 { 899 struct inpcb *inp; 900 struct sockaddr_in6 *sin6; 901 int error; 902 903 inp = sotoinpcb(so); 904 sin6 = (struct sockaddr_in6 *)nam; 905 KASSERT(inp != NULL, ("udp6_connect: inp == NULL")); 906 907 INP_INFO_WLOCK(&V_udbinfo); 908 INP_WLOCK(inp); 909 if ((inp->inp_flags & IN6P_IPV6_V6ONLY) == 0 && 910 IN6_IS_ADDR_V4MAPPED(&sin6->sin6_addr)) { 911 struct sockaddr_in sin; 912 913 if (inp->inp_faddr.s_addr != INADDR_ANY) { 914 error = EISCONN; 915 goto out; 916 } 917 in6_sin6_2_sin(&sin, sin6); 918 error = prison_remote_ip4(td->td_ucred, &sin.sin_addr); 919 if (error != 0) 920 goto out; 921 error = in_pcbconnect(inp, (struct sockaddr *)&sin, 922 td->td_ucred); 923 if (error == 0) { 924 inp->inp_vflag |= INP_IPV4; 925 inp->inp_vflag &= ~INP_IPV6; 926 soisconnected(so); 927 } 928 goto out; 929 } 930 if (!IN6_IS_ADDR_UNSPECIFIED(&inp->in6p_faddr)) { 931 error = EISCONN; 932 goto out; 933 } 934 error = prison_remote_ip6(td->td_ucred, &sin6->sin6_addr); 935 if (error != 0) 936 goto out; 937 error = in6_pcbconnect(inp, nam, td->td_ucred); 938 if (error == 0) { 939 if ((inp->inp_flags & IN6P_IPV6_V6ONLY) == 0) { 940 /* should be non mapped addr */ 941 inp->inp_vflag &= ~INP_IPV4; 942 inp->inp_vflag |= INP_IPV6; 943 } 944 soisconnected(so); 945 } 946 out: 947 INP_WUNLOCK(inp); 948 INP_INFO_WUNLOCK(&V_udbinfo); 949 return (error); 950 } 951 952 static void 953 udp6_detach(struct socket *so) 954 { 955 struct inpcb *inp; 956 struct udpcb *up; 957 958 inp = sotoinpcb(so); 959 KASSERT(inp != NULL, ("udp6_detach: inp == NULL")); 960 961 INP_INFO_WLOCK(&V_udbinfo); 962 INP_WLOCK(inp); 963 up = intoudpcb(inp); 964 KASSERT(up != NULL, ("%s: up == NULL", __func__)); 965 in_pcbdetach(inp); 966 in_pcbfree(inp); 967 INP_INFO_WUNLOCK(&V_udbinfo); 968 udp_discardcb(up); 969 } 970 971 static int 972 udp6_disconnect(struct socket *so) 973 { 974 struct inpcb *inp; 975 int error; 976 977 inp = sotoinpcb(so); 978 KASSERT(inp != NULL, ("udp6_disconnect: inp == NULL")); 979 980 INP_INFO_WLOCK(&V_udbinfo); 981 INP_WLOCK(inp); 982 983 #ifdef INET 984 if (inp->inp_vflag & INP_IPV4) { 985 struct pr_usrreqs *pru; 986 987 pru = inetsw[ip_protox[IPPROTO_UDP]].pr_usrreqs; 988 error = (*pru->pru_disconnect)(so); 989 goto out; 990 } 991 #endif 992 993 if (IN6_IS_ADDR_UNSPECIFIED(&inp->in6p_faddr)) { 994 error = ENOTCONN; 995 goto out; 996 } 997 998 in6_pcbdisconnect(inp); 999 inp->in6p_laddr = in6addr_any; 1000 SOCK_LOCK(so); 1001 so->so_state &= ~SS_ISCONNECTED; /* XXX */ 1002 SOCK_UNLOCK(so); 1003 out: 1004 INP_WUNLOCK(inp); 1005 INP_INFO_WUNLOCK(&V_udbinfo); 1006 return (0); 1007 } 1008 1009 static int 1010 udp6_send(struct socket *so, int flags, struct mbuf *m, 1011 struct sockaddr *addr, struct mbuf *control, struct thread *td) 1012 { 1013 struct inpcb *inp; 1014 int error = 0; 1015 1016 inp = sotoinpcb(so); 1017 KASSERT(inp != NULL, ("udp6_send: inp == NULL")); 1018 1019 INP_INFO_WLOCK(&V_udbinfo); 1020 INP_WLOCK(inp); 1021 if (addr) { 1022 if (addr->sa_len != sizeof(struct sockaddr_in6)) { 1023 error = EINVAL; 1024 goto bad; 1025 } 1026 if (addr->sa_family != AF_INET6) { 1027 error = EAFNOSUPPORT; 1028 goto bad; 1029 } 1030 } 1031 1032 #ifdef INET 1033 if ((inp->inp_flags & IN6P_IPV6_V6ONLY) == 0) { 1034 int hasv4addr; 1035 struct sockaddr_in6 *sin6 = 0; 1036 1037 if (addr == 0) 1038 hasv4addr = (inp->inp_vflag & INP_IPV4); 1039 else { 1040 sin6 = (struct sockaddr_in6 *)addr; 1041 hasv4addr = IN6_IS_ADDR_V4MAPPED(&sin6->sin6_addr) 1042 ? 1 : 0; 1043 } 1044 if (hasv4addr) { 1045 struct pr_usrreqs *pru; 1046 1047 if (!IN6_IS_ADDR_UNSPECIFIED(&inp->in6p_laddr) && 1048 !IN6_IS_ADDR_V4MAPPED(&inp->in6p_laddr)) { 1049 /* 1050 * When remote addr is IPv4-mapped address, 1051 * local addr should not be an IPv6 address; 1052 * since you cannot determine how to map IPv6 1053 * source address to IPv4. 1054 */ 1055 error = EINVAL; 1056 goto out; 1057 } 1058 1059 /* 1060 * XXXRW: We release UDP-layer locks before calling 1061 * udp_send() in order to avoid recursion. However, 1062 * this does mean there is a short window where inp's 1063 * fields are unstable. Could this lead to a 1064 * potential race in which the factors causing us to 1065 * select the UDPv4 output routine are invalidated? 1066 */ 1067 INP_WUNLOCK(inp); 1068 INP_INFO_WUNLOCK(&V_udbinfo); 1069 if (sin6) 1070 in6_sin6_2_sin_in_sock(addr); 1071 pru = inetsw[ip_protox[IPPROTO_UDP]].pr_usrreqs; 1072 /* addr will just be freed in sendit(). */ 1073 return ((*pru->pru_send)(so, flags, m, addr, control, 1074 td)); 1075 } 1076 } 1077 #endif 1078 #ifdef MAC 1079 mac_inpcb_create_mbuf(inp, m); 1080 #endif 1081 error = udp6_output(inp, m, addr, control, td); 1082 #ifdef INET 1083 out: 1084 #endif 1085 INP_WUNLOCK(inp); 1086 INP_INFO_WUNLOCK(&V_udbinfo); 1087 return (error); 1088 1089 bad: 1090 INP_WUNLOCK(inp); 1091 INP_INFO_WUNLOCK(&V_udbinfo); 1092 m_freem(m); 1093 return (error); 1094 } 1095 1096 struct pr_usrreqs udp6_usrreqs = { 1097 .pru_abort = udp6_abort, 1098 .pru_attach = udp6_attach, 1099 .pru_bind = udp6_bind, 1100 .pru_connect = udp6_connect, 1101 .pru_control = in6_control, 1102 .pru_detach = udp6_detach, 1103 .pru_disconnect = udp6_disconnect, 1104 .pru_peeraddr = in6_mapped_peeraddr, 1105 .pru_send = udp6_send, 1106 .pru_shutdown = udp_shutdown, 1107 .pru_sockaddr = in6_mapped_sockaddr, 1108 .pru_soreceive = soreceive_dgram, 1109 .pru_sosend = sosend_dgram, 1110 .pru_sosetlabel = in_pcbsosetlabel, 1111 .pru_close = udp6_close 1112 }; 1113