udp6_usrreq.c revision 186223
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: head/sys/netinet6/udp6_usrreq.c 186223 2008-12-17 13:00:18Z bz $"); 67 68#include "opt_inet.h" 69#include "opt_inet6.h" 70#include "opt_ipsec.h" 71#include "opt_mac.h" 72 73#include <sys/param.h> 74#include <sys/jail.h> 75#include <sys/kernel.h> 76#include <sys/lock.h> 77#include <sys/mbuf.h> 78#include <sys/priv.h> 79#include <sys/proc.h> 80#include <sys/protosw.h> 81#include <sys/signalvar.h> 82#include <sys/socket.h> 83#include <sys/socketvar.h> 84#include <sys/sx.h> 85#include <sys/sysctl.h> 86#include <sys/syslog.h> 87#include <sys/systm.h> 88#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 127extern struct protosw inetsw[]; 128static void udp6_detach(struct socket *so); 129 130static void 131udp6_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 V_udpstat.udps_fullsock++; 170 } else 171 sorwakeup_locked(so); 172} 173 174int 175udp6_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 ip6_hdr *ip6; 181 struct udphdr *uh; 182 struct inpcb *inp; 183 int off = *offp; 184 int plen, ulen; 185 struct sockaddr_in6 fromsa; 186 187 ip6 = mtod(m, struct ip6_hdr *); 188 189 if (faithprefix_p != NULL && (*faithprefix_p)(&ip6->ip6_dst)) { 190 /* XXX send icmp6 host/port unreach? */ 191 m_freem(m); 192 return (IPPROTO_DONE); 193 } 194 195#ifndef PULLDOWN_TEST 196 IP6_EXTHDR_CHECK(m, off, sizeof(struct udphdr), IPPROTO_DONE); 197 ip6 = mtod(m, struct ip6_hdr *); 198 uh = (struct udphdr *)((caddr_t)ip6 + off); 199#else 200 IP6_EXTHDR_GET(uh, struct udphdr *, m, off, sizeof(*uh)); 201 if (!uh) 202 return (IPPROTO_DONE); 203#endif 204 205 V_udpstat.udps_ipackets++; 206 207 /* 208 * Destination port of 0 is illegal, based on RFC768. 209 */ 210 if (uh->uh_dport == 0) 211 goto badunlocked; 212 213 plen = ntohs(ip6->ip6_plen) - off + sizeof(*ip6); 214 ulen = ntohs((u_short)uh->uh_ulen); 215 216 if (plen != ulen) { 217 V_udpstat.udps_badlen++; 218 goto badunlocked; 219 } 220 221 /* 222 * Checksum extended UDP header and data. 223 */ 224 if (uh->uh_sum == 0) { 225 V_udpstat.udps_nosum++; 226 goto badunlocked; 227 } 228 if (in6_cksum(m, IPPROTO_UDP, off, ulen) != 0) { 229 V_udpstat.udps_badsum++; 230 goto badunlocked; 231 } 232 233 /* 234 * Construct sockaddr format source address. 235 */ 236 init_sin6(&fromsa, m); 237 fromsa.sin6_port = uh->uh_sport; 238 239 INP_INFO_RLOCK(&V_udbinfo); 240 if (IN6_IS_ADDR_MULTICAST(&ip6->ip6_dst)) { 241 struct inpcb *last; 242 243 /* 244 * In the event that laddr should be set to the link-local 245 * address (this happens in RIPng), the multicast address 246 * specified in the received packet will not match laddr. To 247 * handle this situation, matching is relaxed if the 248 * receiving interface is the same as one specified in the 249 * socket and if the destination multicast address matches 250 * one of the multicast groups specified in the socket. 251 */ 252 253 /* 254 * KAME note: traditionally we dropped udpiphdr from mbuf 255 * here. We need udphdr for IPsec processing so we do that 256 * later. 257 */ 258 last = NULL; 259 LIST_FOREACH(inp, &V_udb, inp_list) { 260 if ((inp->inp_vflag & INP_IPV6) == 0) 261 continue; 262 if (inp->inp_lport != uh->uh_dport) 263 continue; 264 /* 265 * XXX: Do not check source port of incoming datagram 266 * unless inp_connect() has been called to bind the 267 * fport part of the 4-tuple; the source could be 268 * trying to talk to us with an ephemeral port. 269 */ 270 if (inp->inp_fport != 0 && 271 inp->inp_fport != uh->uh_sport) 272 continue; 273 if (!IN6_IS_ADDR_UNSPECIFIED(&inp->in6p_laddr)) { 274 if (!IN6_ARE_ADDR_EQUAL(&inp->in6p_laddr, 275 &ip6->ip6_dst)) 276 continue; 277 } 278 if (!IN6_IS_ADDR_UNSPECIFIED(&inp->in6p_faddr)) { 279 if (!IN6_ARE_ADDR_EQUAL(&inp->in6p_faddr, 280 &ip6->ip6_src) || 281 inp->inp_fport != uh->uh_sport) 282 continue; 283 } 284 285 if (last != NULL) { 286 struct mbuf *n; 287 288 if ((n = m_copy(m, 0, M_COPYALL)) != NULL) { 289 INP_RLOCK(last); 290 udp6_append(last, n, off, &fromsa); 291 INP_RUNLOCK(last); 292 } 293 } 294 last = inp; 295 /* 296 * Don't look for additional matches if this one does 297 * not have either the SO_REUSEPORT or SO_REUSEADDR 298 * socket options set. This heuristic avoids 299 * searching through all pcbs in the common case of a 300 * non-shared port. It assumes that an application 301 * will never clear these options after setting them. 302 */ 303 if ((last->inp_socket->so_options & 304 (SO_REUSEPORT|SO_REUSEADDR)) == 0) 305 break; 306 } 307 308 if (last == NULL) { 309 /* 310 * No matching pcb found; discard datagram. (No need 311 * to send an ICMP Port Unreachable for a broadcast 312 * or multicast datgram.) 313 */ 314 V_udpstat.udps_noport++; 315 V_udpstat.udps_noportmcast++; 316 goto badheadlocked; 317 } 318 INP_RLOCK(last); 319 INP_INFO_RUNLOCK(&V_udbinfo); 320 udp6_append(last, m, off, &fromsa); 321 INP_RUNLOCK(last); 322 return (IPPROTO_DONE); 323 } 324 /* 325 * Locate pcb for datagram. 326 */ 327 inp = in6_pcblookup_hash(&V_udbinfo, &ip6->ip6_src, uh->uh_sport, 328 &ip6->ip6_dst, uh->uh_dport, 1, m->m_pkthdr.rcvif); 329 if (inp == NULL) { 330 if (udp_log_in_vain) { 331 char ip6bufs[INET6_ADDRSTRLEN]; 332 char ip6bufd[INET6_ADDRSTRLEN]; 333 334 log(LOG_INFO, 335 "Connection attempt to UDP [%s]:%d from [%s]:%d\n", 336 ip6_sprintf(ip6bufd, &ip6->ip6_dst), 337 ntohs(uh->uh_dport), 338 ip6_sprintf(ip6bufs, &ip6->ip6_src), 339 ntohs(uh->uh_sport)); 340 } 341 V_udpstat.udps_noport++; 342 if (m->m_flags & M_MCAST) { 343 printf("UDP6: M_MCAST is set in a unicast packet.\n"); 344 V_udpstat.udps_noportmcast++; 345 goto badheadlocked; 346 } 347 INP_INFO_RUNLOCK(&V_udbinfo); 348 if (V_udp_blackhole) 349 goto badunlocked; 350 if (badport_bandlim(BANDLIM_ICMP6_UNREACH) < 0) 351 goto badunlocked; 352 icmp6_error(m, ICMP6_DST_UNREACH, ICMP6_DST_UNREACH_NOPORT, 0); 353 return (IPPROTO_DONE); 354 } 355 INP_RLOCK(inp); 356 INP_INFO_RUNLOCK(&V_udbinfo); 357 udp6_append(inp, m, off, &fromsa); 358 INP_RUNLOCK(inp); 359 return (IPPROTO_DONE); 360 361badheadlocked: 362 INP_INFO_RUNLOCK(&V_udbinfo); 363badunlocked: 364 if (m) 365 m_freem(m); 366 return (IPPROTO_DONE); 367} 368 369void 370udp6_ctlinput(int cmd, struct sockaddr *sa, void *d) 371{ 372 INIT_VNET_INET(curvnet); 373 struct udphdr uh; 374 struct ip6_hdr *ip6; 375 struct mbuf *m; 376 int off = 0; 377 struct ip6ctlparam *ip6cp = NULL; 378 const struct sockaddr_in6 *sa6_src = NULL; 379 void *cmdarg; 380 struct inpcb *(*notify)(struct inpcb *, int) = udp_notify; 381 struct udp_portonly { 382 u_int16_t uh_sport; 383 u_int16_t uh_dport; 384 } *uhp; 385 386 if (sa->sa_family != AF_INET6 || 387 sa->sa_len != sizeof(struct sockaddr_in6)) 388 return; 389 390 if ((unsigned)cmd >= PRC_NCMDS) 391 return; 392 if (PRC_IS_REDIRECT(cmd)) 393 notify = in6_rtchange, d = NULL; 394 else if (cmd == PRC_HOSTDEAD) 395 d = NULL; 396 else if (inet6ctlerrmap[cmd] == 0) 397 return; 398 399 /* if the parameter is from icmp6, decode it. */ 400 if (d != NULL) { 401 ip6cp = (struct ip6ctlparam *)d; 402 m = ip6cp->ip6c_m; 403 ip6 = ip6cp->ip6c_ip6; 404 off = ip6cp->ip6c_off; 405 cmdarg = ip6cp->ip6c_cmdarg; 406 sa6_src = ip6cp->ip6c_src; 407 } else { 408 m = NULL; 409 ip6 = NULL; 410 cmdarg = NULL; 411 sa6_src = &sa6_any; 412 } 413 414 if (ip6) { 415 /* 416 * XXX: We assume that when IPV6 is non NULL, 417 * M and OFF are valid. 418 */ 419 420 /* Check if we can safely examine src and dst ports. */ 421 if (m->m_pkthdr.len < off + sizeof(*uhp)) 422 return; 423 424 bzero(&uh, sizeof(uh)); 425 m_copydata(m, off, sizeof(*uhp), (caddr_t)&uh); 426 427 (void) in6_pcbnotify(&V_udbinfo, sa, uh.uh_dport, 428 (struct sockaddr *)ip6cp->ip6c_src, uh.uh_sport, cmd, 429 cmdarg, notify); 430 } else 431 (void) in6_pcbnotify(&V_udbinfo, sa, 0, 432 (const struct sockaddr *)sa6_src, 0, cmd, cmdarg, notify); 433} 434 435static int 436udp6_getcred(SYSCTL_HANDLER_ARGS) 437{ 438 INIT_VNET_INET(curvnet); 439 INIT_VNET_INET6(curvnet); 440 struct xucred xuc; 441 struct sockaddr_in6 addrs[2]; 442 struct inpcb *inp; 443 int error; 444 445 error = priv_check(req->td, PRIV_NETINET_GETCRED); 446 if (error) 447 return (error); 448 449 if (req->newlen != sizeof(addrs)) 450 return (EINVAL); 451 if (req->oldlen != sizeof(struct xucred)) 452 return (EINVAL); 453 error = SYSCTL_IN(req, addrs, sizeof(addrs)); 454 if (error) 455 return (error); 456 if ((error = sa6_embedscope(&addrs[0], V_ip6_use_defzone)) != 0 || 457 (error = sa6_embedscope(&addrs[1], V_ip6_use_defzone)) != 0) { 458 return (error); 459 } 460 INP_INFO_RLOCK(&V_udbinfo); 461 inp = in6_pcblookup_hash(&V_udbinfo, &addrs[1].sin6_addr, 462 addrs[1].sin6_port, &addrs[0].sin6_addr, addrs[0].sin6_port, 1, 463 NULL); 464 if (inp != NULL) { 465 INP_RLOCK(inp); 466 INP_INFO_RUNLOCK(&V_udbinfo); 467 if (inp->inp_socket == NULL) 468 error = ENOENT; 469 if (error == 0) 470 error = cr_canseesocket(req->td->td_ucred, 471 inp->inp_socket); 472 if (error == 0) 473 cru2x(inp->inp_cred, &xuc); 474 INP_RUNLOCK(inp); 475 } else { 476 INP_INFO_RUNLOCK(&V_udbinfo); 477 error = ENOENT; 478 } 479 if (error == 0) 480 error = SYSCTL_OUT(req, &xuc, sizeof(struct xucred)); 481 return (error); 482} 483 484SYSCTL_PROC(_net_inet6_udp6, OID_AUTO, getcred, CTLTYPE_OPAQUE|CTLFLAG_RW, 0, 485 0, udp6_getcred, "S,xucred", "Get the xucred of a UDP6 connection"); 486 487static int 488udp6_output(struct inpcb *inp, struct mbuf *m, struct sockaddr *addr6, 489 struct mbuf *control, struct thread *td) 490{ 491 INIT_VNET_INET(curvnet); 492 INIT_VNET_INET6(curvnet); 493 u_int32_t ulen = m->m_pkthdr.len; 494 u_int32_t plen = sizeof(struct udphdr) + ulen; 495 struct ip6_hdr *ip6; 496 struct udphdr *udp6; 497 struct in6_addr *laddr, *faddr; 498 struct sockaddr_in6 *sin6 = NULL; 499 struct ifnet *oifp = NULL; 500 int scope_ambiguous = 0; 501 u_short fport; 502 int error = 0; 503 struct ip6_pktopts *optp, opt; 504 int af = AF_INET6, hlen = sizeof(struct ip6_hdr); 505 int flags; 506 struct sockaddr_in6 tmp; 507 508 INP_WLOCK_ASSERT(inp); 509 510 if (addr6) { 511 /* addr6 has been validated in udp6_send(). */ 512 sin6 = (struct sockaddr_in6 *)addr6; 513 514 /* protect *sin6 from overwrites */ 515 tmp = *sin6; 516 sin6 = &tmp; 517 518 /* 519 * Application should provide a proper zone ID or the use of 520 * default zone IDs should be enabled. Unfortunately, some 521 * applications do not behave as it should, so we need a 522 * workaround. Even if an appropriate ID is not determined, 523 * we'll see if we can determine the outgoing interface. If we 524 * can, determine the zone ID based on the interface below. 525 */ 526 if (sin6->sin6_scope_id == 0 && !V_ip6_use_defzone) 527 scope_ambiguous = 1; 528 if ((error = sa6_embedscope(sin6, V_ip6_use_defzone)) != 0) 529 return (error); 530 } 531 532 if (control) { 533 if ((error = ip6_setpktopts(control, &opt, 534 inp->in6p_outputopts, td->td_ucred, IPPROTO_UDP)) != 0) 535 goto release; 536 optp = &opt; 537 } else 538 optp = inp->in6p_outputopts; 539 540 if (sin6) { 541 faddr = &sin6->sin6_addr; 542 543 /* 544 * IPv4 version of udp_output calls in_pcbconnect in this case, 545 * which needs splnet and affects performance. 546 * Since we saw no essential reason for calling in_pcbconnect, 547 * we get rid of such kind of logic, and call in6_selectsrc 548 * and in6_pcbsetport in order to fill in the local address 549 * and the local port. 550 */ 551 if (sin6->sin6_port == 0) { 552 error = EADDRNOTAVAIL; 553 goto release; 554 } 555 556 if (!IN6_IS_ADDR_UNSPECIFIED(&inp->in6p_faddr)) { 557 /* how about ::ffff:0.0.0.0 case? */ 558 error = EISCONN; 559 goto release; 560 } 561 562 fport = sin6->sin6_port; /* allow 0 port */ 563 564 if (IN6_IS_ADDR_V4MAPPED(faddr)) { 565 if ((inp->inp_flags & IN6P_IPV6_V6ONLY)) { 566 /* 567 * I believe we should explicitly discard the 568 * packet when mapped addresses are disabled, 569 * rather than send the packet as an IPv6 one. 570 * If we chose the latter approach, the packet 571 * might be sent out on the wire based on the 572 * default route, the situation which we'd 573 * probably want to avoid. 574 * (20010421 jinmei@kame.net) 575 */ 576 error = EINVAL; 577 goto release; 578 } 579 if (!IN6_IS_ADDR_UNSPECIFIED(&inp->in6p_laddr) && 580 !IN6_IS_ADDR_V4MAPPED(&inp->in6p_laddr)) { 581 /* 582 * when remote addr is an IPv4-mapped address, 583 * local addr should not be an IPv6 address, 584 * since you cannot determine how to map IPv6 585 * source address to IPv4. 586 */ 587 error = EINVAL; 588 goto release; 589 } 590 591 af = AF_INET; 592 } 593 594 if (!IN6_IS_ADDR_V4MAPPED(faddr)) { 595 laddr = in6_selectsrc(sin6, optp, inp, NULL, 596 td->td_ucred, &oifp, &error); 597 if (oifp && scope_ambiguous && 598 (error = in6_setscope(&sin6->sin6_addr, 599 oifp, NULL))) { 600 goto release; 601 } 602 } else 603 laddr = &inp->in6p_laddr; /* XXX */ 604 if (laddr == NULL) { 605 if (error == 0) 606 error = EADDRNOTAVAIL; 607 goto release; 608 } 609 if (inp->inp_lport == 0 && 610 (error = in6_pcbsetport(laddr, inp, td->td_ucred)) != 0) 611 goto release; 612 } else { 613 if (IN6_IS_ADDR_UNSPECIFIED(&inp->in6p_faddr)) { 614 error = ENOTCONN; 615 goto release; 616 } 617 if (IN6_IS_ADDR_V4MAPPED(&inp->in6p_faddr)) { 618 if ((inp->inp_flags & IN6P_IPV6_V6ONLY)) { 619 /* 620 * XXX: this case would happen when the 621 * application sets the V6ONLY flag after 622 * connecting the foreign address. 623 * Such applications should be fixed, 624 * so we bark here. 625 */ 626 log(LOG_INFO, "udp6_output: IPV6_V6ONLY " 627 "option was set for a connected socket\n"); 628 error = EINVAL; 629 goto release; 630 } else 631 af = AF_INET; 632 } 633 laddr = &inp->in6p_laddr; 634 faddr = &inp->in6p_faddr; 635 fport = inp->inp_fport; 636 } 637 638 if (af == AF_INET) 639 hlen = sizeof(struct ip); 640 641 /* 642 * Calculate data length and get a mbuf 643 * for UDP and IP6 headers. 644 */ 645 M_PREPEND(m, hlen + sizeof(struct udphdr), M_DONTWAIT); 646 if (m == 0) { 647 error = ENOBUFS; 648 goto release; 649 } 650 651 /* 652 * Stuff checksum and output datagram. 653 */ 654 udp6 = (struct udphdr *)(mtod(m, caddr_t) + hlen); 655 udp6->uh_sport = inp->inp_lport; /* lport is always set in the PCB */ 656 udp6->uh_dport = fport; 657 if (plen <= 0xffff) 658 udp6->uh_ulen = htons((u_short)plen); 659 else 660 udp6->uh_ulen = 0; 661 udp6->uh_sum = 0; 662 663 switch (af) { 664 case AF_INET6: 665 ip6 = mtod(m, struct ip6_hdr *); 666 ip6->ip6_flow = inp->inp_flow & IPV6_FLOWINFO_MASK; 667 ip6->ip6_vfc &= ~IPV6_VERSION_MASK; 668 ip6->ip6_vfc |= IPV6_VERSION; 669#if 0 /* ip6_plen will be filled in ip6_output. */ 670 ip6->ip6_plen = htons((u_short)plen); 671#endif 672 ip6->ip6_nxt = IPPROTO_UDP; 673 ip6->ip6_hlim = in6_selecthlim(inp, NULL); 674 ip6->ip6_src = *laddr; 675 ip6->ip6_dst = *faddr; 676 677 if ((udp6->uh_sum = in6_cksum(m, IPPROTO_UDP, 678 sizeof(struct ip6_hdr), plen)) == 0) { 679 udp6->uh_sum = 0xffff; 680 } 681 682 flags = 0; 683 684 V_udpstat.udps_opackets++; 685 error = ip6_output(m, optp, NULL, flags, inp->in6p_moptions, 686 NULL, inp); 687 break; 688 case AF_INET: 689 error = EAFNOSUPPORT; 690 goto release; 691 } 692 goto releaseopt; 693 694release: 695 m_freem(m); 696 697releaseopt: 698 if (control) { 699 ip6_clearpktopts(&opt, -1); 700 m_freem(control); 701 } 702 return (error); 703} 704 705static void 706udp6_abort(struct socket *so) 707{ 708 INIT_VNET_INET(so->so_vnet); 709 struct inpcb *inp; 710 711 inp = sotoinpcb(so); 712 KASSERT(inp != NULL, ("udp6_abort: inp == NULL")); 713 714#ifdef INET 715 if (inp->inp_vflag & INP_IPV4) { 716 struct pr_usrreqs *pru; 717 718 pru = inetsw[ip_protox[IPPROTO_UDP]].pr_usrreqs; 719 (*pru->pru_abort)(so); 720 return; 721 } 722#endif 723 724 INP_INFO_WLOCK(&V_udbinfo); 725 INP_WLOCK(inp); 726 if (!IN6_IS_ADDR_UNSPECIFIED(&inp->in6p_faddr)) { 727 in6_pcbdisconnect(inp); 728 inp->in6p_laddr = in6addr_any; 729 soisdisconnected(so); 730 } 731 INP_WUNLOCK(inp); 732 INP_INFO_WUNLOCK(&V_udbinfo); 733} 734 735static int 736udp6_attach(struct socket *so, int proto, struct thread *td) 737{ 738 INIT_VNET_INET(so->so_vnet); 739 struct inpcb *inp; 740 int error; 741 742 inp = sotoinpcb(so); 743 KASSERT(inp == NULL, ("udp6_attach: inp != NULL")); 744 745 if (so->so_snd.sb_hiwat == 0 || so->so_rcv.sb_hiwat == 0) { 746 error = soreserve(so, udp_sendspace, udp_recvspace); 747 if (error) 748 return (error); 749 } 750 INP_INFO_WLOCK(&V_udbinfo); 751 error = in_pcballoc(so, &V_udbinfo); 752 if (error) { 753 INP_INFO_WUNLOCK(&V_udbinfo); 754 return (error); 755 } 756 inp = (struct inpcb *)so->so_pcb; 757 INP_INFO_WUNLOCK(&V_udbinfo); 758 inp->inp_vflag |= INP_IPV6; 759 if ((inp->inp_flags & IN6P_IPV6_V6ONLY) == 0) 760 inp->inp_vflag |= INP_IPV4; 761 inp->in6p_hops = -1; /* use kernel default */ 762 inp->in6p_cksum = -1; /* just to be sure */ 763 /* 764 * XXX: ugly!! 765 * IPv4 TTL initialization is necessary for an IPv6 socket as well, 766 * because the socket may be bound to an IPv6 wildcard address, 767 * which may match an IPv4-mapped IPv6 address. 768 */ 769 inp->inp_ip_ttl = V_ip_defttl; 770 INP_WUNLOCK(inp); 771 return (0); 772} 773 774static int 775udp6_bind(struct socket *so, struct sockaddr *nam, struct thread *td) 776{ 777 INIT_VNET_INET(so->so_vnet); 778 struct inpcb *inp; 779 int error; 780 781 inp = sotoinpcb(so); 782 KASSERT(inp != NULL, ("udp6_bind: inp == NULL")); 783 784 INP_INFO_WLOCK(&V_udbinfo); 785 INP_WLOCK(inp); 786 inp->inp_vflag &= ~INP_IPV4; 787 inp->inp_vflag |= INP_IPV6; 788 if ((inp->inp_flags & IN6P_IPV6_V6ONLY) == 0) { 789 struct sockaddr_in6 *sin6_p; 790 791 sin6_p = (struct sockaddr_in6 *)nam; 792 793 if (IN6_IS_ADDR_UNSPECIFIED(&sin6_p->sin6_addr)) 794 inp->inp_vflag |= INP_IPV4; 795 else if (IN6_IS_ADDR_V4MAPPED(&sin6_p->sin6_addr)) { 796 struct sockaddr_in sin; 797 798 in6_sin6_2_sin(&sin, sin6_p); 799 inp->inp_vflag |= INP_IPV4; 800 inp->inp_vflag &= ~INP_IPV6; 801 error = in_pcbbind(inp, (struct sockaddr *)&sin, 802 td->td_ucred); 803 goto out; 804 } 805 } 806 807 error = in6_pcbbind(inp, nam, td->td_ucred); 808out: 809 INP_WUNLOCK(inp); 810 INP_INFO_WUNLOCK(&V_udbinfo); 811 return (error); 812} 813 814static void 815udp6_close(struct socket *so) 816{ 817 INIT_VNET_INET(so->so_vnet); 818 struct inpcb *inp; 819 820 inp = sotoinpcb(so); 821 KASSERT(inp != NULL, ("udp6_close: inp == NULL")); 822 823#ifdef INET 824 if (inp->inp_vflag & INP_IPV4) { 825 struct pr_usrreqs *pru; 826 827 pru = inetsw[ip_protox[IPPROTO_UDP]].pr_usrreqs; 828 (*pru->pru_disconnect)(so); 829 return; 830 } 831#endif 832 INP_INFO_WLOCK(&V_udbinfo); 833 INP_WLOCK(inp); 834 if (!IN6_IS_ADDR_UNSPECIFIED(&inp->in6p_faddr)) { 835 in6_pcbdisconnect(inp); 836 inp->in6p_laddr = in6addr_any; 837 soisdisconnected(so); 838 } 839 INP_WUNLOCK(inp); 840 INP_INFO_WUNLOCK(&V_udbinfo); 841} 842 843static int 844udp6_connect(struct socket *so, struct sockaddr *nam, struct thread *td) 845{ 846 INIT_VNET_INET(so->so_vnet); 847 struct inpcb *inp; 848 int error; 849 850 inp = sotoinpcb(so); 851 KASSERT(inp != NULL, ("udp6_connect: inp == NULL")); 852 853 INP_INFO_WLOCK(&V_udbinfo); 854 INP_WLOCK(inp); 855 if ((inp->inp_flags & IN6P_IPV6_V6ONLY) == 0) { 856 struct sockaddr_in6 *sin6_p; 857 858 sin6_p = (struct sockaddr_in6 *)nam; 859 if (IN6_IS_ADDR_V4MAPPED(&sin6_p->sin6_addr)) { 860 struct sockaddr_in sin; 861 862 if (inp->inp_faddr.s_addr != INADDR_ANY) { 863 error = EISCONN; 864 goto out; 865 } 866 in6_sin6_2_sin(&sin, sin6_p); 867 if (td && jailed(td->td_ucred)) 868 if (prison_remote_ip4(td->td_ucred, 869 &sin.sin_addr) != 0) { 870 error = EAFNOSUPPORT; 871 goto out; 872 } 873 error = in_pcbconnect(inp, (struct sockaddr *)&sin, 874 td->td_ucred); 875 if (error == 0) { 876 inp->inp_vflag |= INP_IPV4; 877 inp->inp_vflag &= ~INP_IPV6; 878 soisconnected(so); 879 } 880 goto out; 881 } 882 } 883 if (!IN6_IS_ADDR_UNSPECIFIED(&inp->in6p_faddr)) { 884 error = EISCONN; 885 goto out; 886 } 887 if (td && jailed(td->td_ucred)) { 888 struct sockaddr_in6 *sin6 = (struct sockaddr_in6 *)nam; 889 if (prison_remote_ip6(td->td_ucred, &sin6->sin6_addr) != 0) { 890 error = EAFNOSUPPORT; 891 goto out; 892 } 893 } 894 error = in6_pcbconnect(inp, nam, td->td_ucred); 895 if (error == 0) { 896 if ((inp->inp_flags & IN6P_IPV6_V6ONLY) == 0) { 897 /* should be non mapped addr */ 898 inp->inp_vflag &= ~INP_IPV4; 899 inp->inp_vflag |= INP_IPV6; 900 } 901 soisconnected(so); 902 } 903out: 904 INP_WUNLOCK(inp); 905 INP_INFO_WUNLOCK(&V_udbinfo); 906 return (error); 907} 908 909static void 910udp6_detach(struct socket *so) 911{ 912 INIT_VNET_INET(so->so_vnet); 913 struct inpcb *inp; 914 915 inp = sotoinpcb(so); 916 KASSERT(inp != NULL, ("udp6_detach: inp == NULL")); 917 918 INP_INFO_WLOCK(&V_udbinfo); 919 INP_WLOCK(inp); 920 in_pcbdetach(inp); 921 in_pcbfree(inp); 922 INP_INFO_WUNLOCK(&V_udbinfo); 923} 924 925static int 926udp6_disconnect(struct socket *so) 927{ 928 INIT_VNET_INET(so->so_vnet); 929 struct inpcb *inp; 930 int error; 931 932 inp = sotoinpcb(so); 933 KASSERT(inp != NULL, ("udp6_disconnect: inp == NULL")); 934 935 INP_INFO_WLOCK(&V_udbinfo); 936 INP_WLOCK(inp); 937 938#ifdef INET 939 if (inp->inp_vflag & INP_IPV4) { 940 struct pr_usrreqs *pru; 941 942 pru = inetsw[ip_protox[IPPROTO_UDP]].pr_usrreqs; 943 error = (*pru->pru_disconnect)(so); 944 goto out; 945 } 946#endif 947 948 if (IN6_IS_ADDR_UNSPECIFIED(&inp->in6p_faddr)) { 949 error = ENOTCONN; 950 goto out; 951 } 952 953 in6_pcbdisconnect(inp); 954 inp->in6p_laddr = in6addr_any; 955 SOCK_LOCK(so); 956 so->so_state &= ~SS_ISCONNECTED; /* XXX */ 957 SOCK_UNLOCK(so); 958out: 959 INP_WUNLOCK(inp); 960 INP_INFO_WUNLOCK(&V_udbinfo); 961 return (0); 962} 963 964static int 965udp6_send(struct socket *so, int flags, struct mbuf *m, 966 struct sockaddr *addr, struct mbuf *control, struct thread *td) 967{ 968 INIT_VNET_INET(so->so_vnet); 969 struct inpcb *inp; 970 int error = 0; 971 972 inp = sotoinpcb(so); 973 KASSERT(inp != NULL, ("udp6_send: inp == NULL")); 974 975 INP_INFO_WLOCK(&V_udbinfo); 976 INP_WLOCK(inp); 977 if (addr) { 978 if (addr->sa_len != sizeof(struct sockaddr_in6)) { 979 error = EINVAL; 980 goto bad; 981 } 982 if (addr->sa_family != AF_INET6) { 983 error = EAFNOSUPPORT; 984 goto bad; 985 } 986 } 987 988#ifdef INET 989 if ((inp->inp_flags & IN6P_IPV6_V6ONLY) == 0) { 990 int hasv4addr; 991 struct sockaddr_in6 *sin6 = 0; 992 993 if (addr == 0) 994 hasv4addr = (inp->inp_vflag & INP_IPV4); 995 else { 996 sin6 = (struct sockaddr_in6 *)addr; 997 hasv4addr = IN6_IS_ADDR_V4MAPPED(&sin6->sin6_addr) 998 ? 1 : 0; 999 } 1000 if (hasv4addr) { 1001 struct pr_usrreqs *pru; 1002 1003 if (!IN6_IS_ADDR_UNSPECIFIED(&inp->in6p_laddr) && 1004 !IN6_IS_ADDR_V4MAPPED(&inp->in6p_laddr)) { 1005 /* 1006 * When remote addr is IPv4-mapped address, 1007 * local addr should not be an IPv6 address; 1008 * since you cannot determine how to map IPv6 1009 * source address to IPv4. 1010 */ 1011 error = EINVAL; 1012 goto out; 1013 } 1014 1015 /* 1016 * XXXRW: We release UDP-layer locks before calling 1017 * udp_send() in order to avoid recursion. However, 1018 * this does mean there is a short window where inp's 1019 * fields are unstable. Could this lead to a 1020 * potential race in which the factors causing us to 1021 * select the UDPv4 output routine are invalidated? 1022 */ 1023 INP_WUNLOCK(inp); 1024 INP_INFO_WUNLOCK(&V_udbinfo); 1025 if (sin6) 1026 in6_sin6_2_sin_in_sock(addr); 1027 pru = inetsw[ip_protox[IPPROTO_UDP]].pr_usrreqs; 1028 /* addr will just be freed in sendit(). */ 1029 return ((*pru->pru_send)(so, flags, m, addr, control, 1030 td)); 1031 } 1032 } 1033#endif 1034#ifdef MAC 1035 mac_inpcb_create_mbuf(inp, m); 1036#endif 1037 error = udp6_output(inp, m, addr, control, td); 1038out: 1039 INP_WUNLOCK(inp); 1040 INP_INFO_WUNLOCK(&V_udbinfo); 1041 return (error); 1042 1043bad: 1044 INP_WUNLOCK(inp); 1045 INP_INFO_WUNLOCK(&V_udbinfo); 1046 m_freem(m); 1047 return (error); 1048} 1049 1050struct pr_usrreqs udp6_usrreqs = { 1051 .pru_abort = udp6_abort, 1052 .pru_attach = udp6_attach, 1053 .pru_bind = udp6_bind, 1054 .pru_connect = udp6_connect, 1055 .pru_control = in6_control, 1056 .pru_detach = udp6_detach, 1057 .pru_disconnect = udp6_disconnect, 1058 .pru_peeraddr = in6_mapped_peeraddr, 1059 .pru_send = udp6_send, 1060 .pru_shutdown = udp_shutdown, 1061 .pru_sockaddr = in6_mapped_sockaddr, 1062 .pru_soreceive = soreceive_dgram, 1063 .pru_sosend = sosend_dgram, 1064 .pru_sosetlabel = in_pcbsosetlabel, 1065 .pru_close = udp6_close 1066}; 1067