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FreeBSD/Linux Kernel Cross Reference
sys/netinet6/udp6_usrreq.c
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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, 1989, 1993 35 * The Regents of the University of California. All rights reserved. 36 * 37 * Redistribution and use in source and binary forms, with or without 38 * modification, are permitted provided that the following conditions 39 * are met: 40 * 1. Redistributions of source code must retain the above copyright 41 * notice, this list of conditions and the following disclaimer. 42 * 2. Redistributions in binary form must reproduce the above copyright 43 * notice, this list of conditions and the following disclaimer in the 44 * documentation and/or other materials provided with the distribution. 45 * 4. Neither the name of the University nor the names of its contributors 46 * may be used to endorse or promote products derived from this software 47 * without specific prior written permission. 48 * 49 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND 50 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 51 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 52 * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE 53 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 54 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 55 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 56 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 57 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 58 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 59 * SUCH DAMAGE. 60 * 61 * @(#)udp_usrreq.c 8.6 (Berkeley) 5/23/95 62 */ 63 64 #include <sys/cdefs.h> 65 __FBSDID("$FreeBSD: releng/6.4/sys/netinet6/udp6_usrreq.c 182649 2008-09-01 22:57:56Z obrien $"); 66 67 #include "opt_inet.h" 68 #include "opt_inet6.h" 69 #include "opt_ipsec.h" 70 71 #include <sys/param.h> 72 #include <sys/errno.h> 73 #include <sys/kernel.h> 74 #include <sys/lock.h> 75 #include <sys/mbuf.h> 76 #include <sys/proc.h> 77 #include <sys/protosw.h> 78 #include <sys/signalvar.h> 79 #include <sys/socket.h> 80 #include <sys/socketvar.h> 81 #include <sys/stat.h> 82 #include <sys/sx.h> 83 #include <sys/sysctl.h> 84 #include <sys/syslog.h> 85 #include <sys/systm.h> 86 87 #include <net/if.h> 88 #include <net/if_types.h> 89 #include <net/route.h> 90 91 #include <netinet/in.h> 92 #include <netinet/in_pcb.h> 93 #include <netinet/in_systm.h> 94 #include <netinet/in_var.h> 95 #include <netinet/ip.h> 96 #include <netinet/ip6.h> 97 #include <netinet/icmp6.h> 98 #include <netinet/ip_var.h> 99 #include <netinet/udp.h> 100 #include <netinet/udp_var.h> 101 #include <netinet6/ip6protosw.h> 102 #include <netinet6/ip6_var.h> 103 #include <netinet6/in6_pcb.h> 104 #include <netinet6/udp6_var.h> 105 #include <netinet6/scope6_var.h> 106 107 #ifdef IPSEC 108 #include <netinet6/ipsec.h> 109 #include <netinet6/ipsec6.h> 110 #endif /* IPSEC */ 111 112 #ifdef FAST_IPSEC 113 #include <netipsec/ipsec.h> 114 #include <netipsec/ipsec6.h> 115 #endif /* FAST_IPSEC */ 116 117 /* 118 * UDP protocol inplementation. 119 * Per RFC 768, August, 1980. 120 */ 121 122 extern struct protosw inetsw[]; 123 static int udp6_detach __P((struct socket *so)); 124 125 int 126 udp6_input(mp, offp, proto) 127 struct mbuf **mp; 128 int *offp, proto; 129 { 130 struct mbuf *m = *mp, *opts; 131 register struct ip6_hdr *ip6; 132 register struct udphdr *uh; 133 register struct inpcb *in6p; 134 int off = *offp; 135 int plen, ulen; 136 struct sockaddr_in6 fromsa; 137 138 opts = NULL; 139 140 ip6 = mtod(m, struct ip6_hdr *); 141 142 if (faithprefix_p != NULL && (*faithprefix_p)(&ip6->ip6_dst)) { 143 /* XXX send icmp6 host/port unreach? */ 144 m_freem(m); 145 return IPPROTO_DONE; 146 } 147 148 #ifndef PULLDOWN_TEST 149 IP6_EXTHDR_CHECK(m, off, sizeof(struct udphdr), IPPROTO_DONE); 150 ip6 = mtod(m, struct ip6_hdr *); 151 uh = (struct udphdr *)((caddr_t)ip6 + off); 152 #else 153 IP6_EXTHDR_GET(uh, struct udphdr *, m, off, sizeof(*uh)); 154 if (!uh) 155 return IPPROTO_DONE; 156 #endif 157 158 udpstat.udps_ipackets++; 159 160 plen = ntohs(ip6->ip6_plen) - off + sizeof(*ip6); 161 ulen = ntohs((u_short)uh->uh_ulen); 162 163 if (plen != ulen) { 164 udpstat.udps_badlen++; 165 goto bad; 166 } 167 168 /* 169 * Checksum extended UDP header and data. 170 */ 171 if (uh->uh_sum == 0) { 172 udpstat.udps_nosum++; 173 goto bad; 174 } 175 if (in6_cksum(m, IPPROTO_UDP, off, ulen) != 0) { 176 udpstat.udps_badsum++; 177 goto bad; 178 } 179 180 if (IN6_IS_ADDR_MULTICAST(&ip6->ip6_dst)) { 181 struct inpcb *last; 182 183 /* 184 * Deliver a multicast datagram to all sockets 185 * for which the local and remote addresses and ports match 186 * those of the incoming datagram. This allows more than 187 * one process to receive multicasts on the same port. 188 * (This really ought to be done for unicast datagrams as 189 * well, but that would cause problems with existing 190 * applications that open both address-specific sockets and 191 * a wildcard socket listening to the same port -- they would 192 * end up receiving duplicates of every unicast datagram. 193 * Those applications open the multiple sockets to overcome an 194 * inadequacy of the UDP socket interface, but for backwards 195 * compatibility we avoid the problem here rather than 196 * fixing the interface. Maybe 4.5BSD will remedy this?) 197 */ 198 199 /* 200 * In a case that laddr should be set to the link-local 201 * address (this happens in RIPng), the multicast address 202 * specified in the received packet does not match with 203 * laddr. To cure this situation, the matching is relaxed 204 * if the receiving interface is the same as one specified 205 * in the socket and if the destination multicast address 206 * matches one of the multicast groups specified in the socket. 207 */ 208 209 /* 210 * Construct sockaddr format source address. 211 */ 212 init_sin6(&fromsa, m); 213 fromsa.sin6_port = uh->uh_sport; 214 /* 215 * KAME note: traditionally we dropped udpiphdr from mbuf here. 216 * We need udphdr for IPsec processing so we do that later. 217 */ 218 219 /* 220 * Locate pcb(s) for datagram. 221 * (Algorithm copied from raw_intr().) 222 */ 223 last = NULL; 224 LIST_FOREACH(in6p, &udb, inp_list) { 225 if ((in6p->inp_vflag & INP_IPV6) == 0) 226 continue; 227 if (in6p->in6p_lport != uh->uh_dport) 228 continue; 229 if (!IN6_IS_ADDR_UNSPECIFIED(&in6p->in6p_laddr)) { 230 if (!IN6_ARE_ADDR_EQUAL(&in6p->in6p_laddr, 231 &ip6->ip6_dst)) 232 continue; 233 } 234 if (!IN6_IS_ADDR_UNSPECIFIED(&in6p->in6p_faddr)) { 235 if (!IN6_ARE_ADDR_EQUAL(&in6p->in6p_faddr, 236 &ip6->ip6_src) || 237 in6p->in6p_fport != uh->uh_sport) 238 continue; 239 } 240 241 if (last != NULL) { 242 struct mbuf *n; 243 244 #if defined(IPSEC) || defined(FAST_IPSEC) 245 /* 246 * Check AH/ESP integrity. 247 */ 248 if (ipsec6_in_reject(m, last)) { 249 #ifdef IPSEC 250 ipsec6stat.in_polvio++; 251 #endif /* IPSEC */ 252 /* do not inject data into pcb */ 253 } else 254 #endif /*IPSEC || FAST_IPSEC*/ 255 if ((n = m_copy(m, 0, M_COPYALL)) != NULL) { 256 /* 257 * KAME NOTE: do not 258 * m_copy(m, offset, ...) above. 259 * sbappendaddr() expects M_PKTHDR, 260 * and m_copy() will copy M_PKTHDR 261 * only if offset is 0. 262 */ 263 if (last->in6p_flags & IN6P_CONTROLOPTS 264 || last->in6p_socket->so_options & SO_TIMESTAMP) 265 ip6_savecontrol(last, n, &opts); 266 267 m_adj(n, off + sizeof(struct udphdr)); 268 if (sbappendaddr(&last->in6p_socket->so_rcv, 269 (struct sockaddr *)&fromsa, 270 n, opts) == 0) { 271 m_freem(n); 272 if (opts) 273 m_freem(opts); 274 udpstat.udps_fullsock++; 275 } else 276 sorwakeup(last->in6p_socket); 277 opts = NULL; 278 } 279 } 280 last = in6p; 281 /* 282 * Don't look for additional matches if this one does 283 * not have either the SO_REUSEPORT or SO_REUSEADDR 284 * socket options set. This heuristic avoids searching 285 * through all pcbs in the common case of a non-shared 286 * port. It assumes that an application will never 287 * clear these options after setting them. 288 */ 289 if ((last->in6p_socket->so_options & 290 (SO_REUSEPORT|SO_REUSEADDR)) == 0) 291 break; 292 } 293 294 if (last == NULL) { 295 /* 296 * No matching pcb found; discard datagram. 297 * (No need to send an ICMP Port Unreachable 298 * for a broadcast or multicast datgram.) 299 */ 300 udpstat.udps_noport++; 301 udpstat.udps_noportmcast++; 302 goto bad; 303 } 304 #if defined(IPSEC) || defined(FAST_IPSEC) 305 /* 306 * Check AH/ESP integrity. 307 */ 308 if (ipsec6_in_reject(m, last)) { 309 #ifdef IPSEC 310 ipsec6stat.in_polvio++; 311 #endif /* IPSEC */ 312 goto bad; 313 } 314 #endif /*IPSEC || FAST_IPSEC*/ 315 if (last->in6p_flags & IN6P_CONTROLOPTS 316 || last->in6p_socket->so_options & SO_TIMESTAMP) 317 ip6_savecontrol(last, m, &opts); 318 319 m_adj(m, off + sizeof(struct udphdr)); 320 if (sbappendaddr(&last->in6p_socket->so_rcv, 321 (struct sockaddr *)&fromsa, 322 m, opts) == 0) { 323 udpstat.udps_fullsock++; 324 goto bad; 325 } 326 sorwakeup(last->in6p_socket); 327 return IPPROTO_DONE; 328 } 329 /* 330 * Locate pcb for datagram. 331 */ 332 in6p = in6_pcblookup_hash(&udbinfo, &ip6->ip6_src, uh->uh_sport, 333 &ip6->ip6_dst, uh->uh_dport, 1, 334 m->m_pkthdr.rcvif); 335 if (in6p == 0) { 336 if (log_in_vain) { 337 char buf[INET6_ADDRSTRLEN]; 338 339 strcpy(buf, ip6_sprintf(&ip6->ip6_dst)); 340 log(LOG_INFO, 341 "Connection attempt to UDP [%s]:%d from [%s]:%d\n", 342 buf, ntohs(uh->uh_dport), 343 ip6_sprintf(&ip6->ip6_src), ntohs(uh->uh_sport)); 344 } 345 udpstat.udps_noport++; 346 if (m->m_flags & M_MCAST) { 347 printf("UDP6: M_MCAST is set in a unicast packet.\n"); 348 udpstat.udps_noportmcast++; 349 goto bad; 350 } 351 icmp6_error(m, ICMP6_DST_UNREACH, ICMP6_DST_UNREACH_NOPORT, 0); 352 return IPPROTO_DONE; 353 } 354 #if defined(IPSEC) || defined(FAST_IPSEC) 355 /* 356 * Check AH/ESP integrity. 357 */ 358 if (ipsec6_in_reject(m, in6p)) { 359 #ifdef IPSEC 360 ipsec6stat.in_polvio++; 361 #endif /* IPSEC */ 362 goto bad; 363 } 364 #endif /*IPSEC || FAST_IPSEC*/ 365 366 /* 367 * Construct sockaddr format source address. 368 * Stuff source address and datagram in user buffer. 369 */ 370 init_sin6(&fromsa, m); 371 fromsa.sin6_port = uh->uh_sport; 372 if (in6p->in6p_flags & IN6P_CONTROLOPTS 373 || in6p->in6p_socket->so_options & SO_TIMESTAMP) 374 ip6_savecontrol(in6p, m, &opts); 375 m_adj(m, off + sizeof(struct udphdr)); 376 if (sbappendaddr(&in6p->in6p_socket->so_rcv, 377 (struct sockaddr *)&fromsa, m, opts) == 0) { 378 udpstat.udps_fullsock++; 379 goto bad; 380 } 381 sorwakeup(in6p->in6p_socket); 382 return IPPROTO_DONE; 383 bad: 384 if (m) 385 m_freem(m); 386 if (opts) 387 m_freem(opts); 388 return IPPROTO_DONE; 389 } 390 391 void 392 udp6_ctlinput(cmd, sa, d) 393 int cmd; 394 struct sockaddr *sa; 395 void *d; 396 { 397 struct udphdr uh; 398 struct ip6_hdr *ip6; 399 struct mbuf *m; 400 int off = 0; 401 struct ip6ctlparam *ip6cp = NULL; 402 const struct sockaddr_in6 *sa6_src = NULL; 403 void *cmdarg; 404 struct inpcb *(*notify)(struct inpcb *, int) = udp_notify; 405 struct udp_portonly { 406 u_int16_t uh_sport; 407 u_int16_t uh_dport; 408 } *uhp; 409 410 if (sa->sa_family != AF_INET6 || 411 sa->sa_len != sizeof(struct sockaddr_in6)) 412 return; 413 414 if ((unsigned)cmd >= PRC_NCMDS) 415 return; 416 if (PRC_IS_REDIRECT(cmd)) 417 notify = in6_rtchange, d = NULL; 418 else if (cmd == PRC_HOSTDEAD) 419 d = NULL; 420 else if (inet6ctlerrmap[cmd] == 0) 421 return; 422 423 /* if the parameter is from icmp6, decode it. */ 424 if (d != NULL) { 425 ip6cp = (struct ip6ctlparam *)d; 426 m = ip6cp->ip6c_m; 427 ip6 = ip6cp->ip6c_ip6; 428 off = ip6cp->ip6c_off; 429 cmdarg = ip6cp->ip6c_cmdarg; 430 sa6_src = ip6cp->ip6c_src; 431 } else { 432 m = NULL; 433 ip6 = NULL; 434 cmdarg = NULL; 435 sa6_src = &sa6_any; 436 } 437 438 if (ip6) { 439 /* 440 * XXX: We assume that when IPV6 is non NULL, 441 * M and OFF are valid. 442 */ 443 444 /* check if we can safely examine src and dst ports */ 445 if (m->m_pkthdr.len < off + sizeof(*uhp)) 446 return; 447 448 bzero(&uh, sizeof(uh)); 449 m_copydata(m, off, sizeof(*uhp), (caddr_t)&uh); 450 451 (void) in6_pcbnotify(&udbinfo, sa, uh.uh_dport, 452 (struct sockaddr *)ip6cp->ip6c_src, 453 uh.uh_sport, cmd, cmdarg, notify); 454 } else 455 (void) in6_pcbnotify(&udbinfo, sa, 0, 456 (const struct sockaddr *)sa6_src, 457 0, cmd, cmdarg, notify); 458 } 459 460 static int 461 udp6_getcred(SYSCTL_HANDLER_ARGS) 462 { 463 struct xucred xuc; 464 struct sockaddr_in6 addrs[2]; 465 struct inpcb *inp; 466 int error, s; 467 468 error = suser(req->td); 469 if (error) 470 return (error); 471 472 if (req->newlen != sizeof(addrs)) 473 return (EINVAL); 474 if (req->oldlen != sizeof(struct xucred)) 475 return (EINVAL); 476 error = SYSCTL_IN(req, addrs, sizeof(addrs)); 477 if (error) 478 return (error); 479 if ((error = sa6_embedscope(&addrs[0], ip6_use_defzone)) != 0 || 480 (error = sa6_embedscope(&addrs[1], ip6_use_defzone)) != 0) { 481 return (error); 482 } 483 s = splnet(); 484 inp = in6_pcblookup_hash(&udbinfo, &addrs[1].sin6_addr, 485 addrs[1].sin6_port, 486 &addrs[0].sin6_addr, addrs[0].sin6_port, 487 1, NULL); 488 if (!inp || !inp->inp_socket) { 489 error = ENOENT; 490 goto out; 491 } 492 cru2x(inp->inp_socket->so_cred, &xuc); 493 error = SYSCTL_OUT(req, &xuc, sizeof(struct xucred)); 494 out: 495 splx(s); 496 return (error); 497 } 498 499 SYSCTL_PROC(_net_inet6_udp6, OID_AUTO, getcred, CTLTYPE_OPAQUE|CTLFLAG_RW, 500 0, 0, 501 udp6_getcred, "S,xucred", "Get the xucred of a UDP6 connection"); 502 503 static int 504 udp6_abort(struct socket *so) 505 { 506 struct inpcb *inp; 507 int s; 508 509 INP_INFO_WLOCK(&udbinfo); 510 inp = sotoinpcb(so); 511 if (inp == 0) { 512 INP_INFO_WUNLOCK(&udbinfo); 513 return EINVAL; /* ??? possible? panic instead? */ 514 } 515 soisdisconnected(so); 516 s = splnet(); 517 INP_LOCK(inp); 518 in6_pcbdetach(inp); 519 INP_INFO_WUNLOCK(&udbinfo); 520 splx(s); 521 return 0; 522 } 523 524 static int 525 udp6_attach(struct socket *so, int proto, struct thread *td) 526 { 527 struct inpcb *inp; 528 int s, error; 529 530 INP_INFO_WLOCK(&udbinfo); 531 inp = sotoinpcb(so); 532 if (inp != 0) { 533 INP_INFO_WUNLOCK(&udbinfo); 534 return EINVAL; 535 } 536 537 if (so->so_snd.sb_hiwat == 0 || so->so_rcv.sb_hiwat == 0) { 538 error = soreserve(so, udp_sendspace, udp_recvspace); 539 if (error) { 540 INP_INFO_WUNLOCK(&udbinfo); 541 return error; 542 } 543 } 544 s = splnet(); 545 error = in_pcballoc(so, &udbinfo); 546 splx(s); 547 if (error) { 548 INP_INFO_WUNLOCK(&udbinfo); 549 return error; 550 } 551 inp = (struct inpcb *)so->so_pcb; 552 INP_INFO_WUNLOCK(&udbinfo); 553 inp->inp_vflag |= INP_IPV6; 554 if ((inp->inp_flags & IN6P_IPV6_V6ONLY) == 0) 555 inp->inp_vflag |= INP_IPV4; 556 inp->in6p_hops = -1; /* use kernel default */ 557 inp->in6p_cksum = -1; /* just to be sure */ 558 /* 559 * XXX: ugly!! 560 * IPv4 TTL initialization is necessary for an IPv6 socket as well, 561 * because the socket may be bound to an IPv6 wildcard address, 562 * which may match an IPv4-mapped IPv6 address. 563 */ 564 inp->inp_ip_ttl = ip_defttl; 565 INP_UNLOCK(inp); 566 return 0; 567 } 568 569 static int 570 udp6_bind(struct socket *so, struct sockaddr *nam, struct thread *td) 571 { 572 struct inpcb *inp; 573 int s, error; 574 575 INP_INFO_WLOCK(&udbinfo); 576 inp = sotoinpcb(so); 577 if (inp == 0) { 578 INP_INFO_WUNLOCK(&udbinfo); 579 return EINVAL; 580 } 581 INP_LOCK(inp); 582 583 inp->inp_vflag &= ~INP_IPV4; 584 inp->inp_vflag |= INP_IPV6; 585 if ((inp->inp_flags & IN6P_IPV6_V6ONLY) == 0) { 586 struct sockaddr_in6 *sin6_p; 587 588 sin6_p = (struct sockaddr_in6 *)nam; 589 590 if (IN6_IS_ADDR_UNSPECIFIED(&sin6_p->sin6_addr)) 591 inp->inp_vflag |= INP_IPV4; 592 else if (IN6_IS_ADDR_V4MAPPED(&sin6_p->sin6_addr)) { 593 struct sockaddr_in sin; 594 595 in6_sin6_2_sin(&sin, sin6_p); 596 inp->inp_vflag |= INP_IPV4; 597 inp->inp_vflag &= ~INP_IPV6; 598 s = splnet(); 599 error = in_pcbbind(inp, (struct sockaddr *)&sin, 600 td->td_ucred); 601 goto out; 602 } 603 } 604 605 s = splnet(); 606 error = in6_pcbbind(inp, nam, td->td_ucred); 607 out: 608 INP_UNLOCK(inp); 609 INP_INFO_WUNLOCK(&udbinfo); 610 splx(s); 611 return error; 612 } 613 614 static int 615 udp6_connect(struct socket *so, struct sockaddr *nam, struct thread *td) 616 { 617 struct inpcb *inp; 618 int s, error; 619 620 INP_INFO_WLOCK(&udbinfo); 621 inp = sotoinpcb(so); 622 if (inp == 0) { 623 INP_INFO_WUNLOCK(&udbinfo); 624 return EINVAL; 625 } 626 INP_LOCK(inp); 627 628 if ((inp->inp_flags & IN6P_IPV6_V6ONLY) == 0) { 629 struct sockaddr_in6 *sin6_p; 630 631 sin6_p = (struct sockaddr_in6 *)nam; 632 if (IN6_IS_ADDR_V4MAPPED(&sin6_p->sin6_addr)) { 633 struct sockaddr_in sin; 634 635 if (inp->inp_faddr.s_addr != INADDR_ANY) 636 return EISCONN; 637 in6_sin6_2_sin(&sin, sin6_p); 638 s = splnet(); 639 error = in_pcbconnect(inp, (struct sockaddr *)&sin, 640 td->td_ucred); 641 splx(s); 642 if (error == 0) { 643 inp->inp_vflag |= INP_IPV4; 644 inp->inp_vflag &= ~INP_IPV6; 645 soisconnected(so); 646 } 647 goto out; 648 } 649 } 650 if (!IN6_IS_ADDR_UNSPECIFIED(&inp->in6p_faddr)) { 651 error = EISCONN; 652 goto out; 653 } 654 s = splnet(); 655 error = in6_pcbconnect(inp, nam, td->td_ucred); 656 splx(s); 657 if (error == 0) { 658 if ((inp->inp_flags & IN6P_IPV6_V6ONLY) == 0) { 659 /* should be non mapped addr */ 660 inp->inp_vflag &= ~INP_IPV4; 661 inp->inp_vflag |= INP_IPV6; 662 } 663 soisconnected(so); 664 } 665 out: 666 INP_UNLOCK(inp); 667 INP_INFO_WUNLOCK(&udbinfo); 668 return error; 669 } 670 671 static int 672 udp6_detach(struct socket *so) 673 { 674 struct inpcb *inp; 675 int s; 676 677 INP_INFO_WLOCK(&udbinfo); 678 inp = sotoinpcb(so); 679 if (inp == 0) { 680 INP_INFO_WUNLOCK(&udbinfo); 681 return EINVAL; 682 } 683 INP_LOCK(inp); 684 s = splnet(); 685 in6_pcbdetach(inp); 686 splx(s); 687 INP_INFO_WUNLOCK(&udbinfo); 688 return 0; 689 } 690 691 static int 692 udp6_disconnect(struct socket *so) 693 { 694 struct inpcb *inp; 695 int error, s; 696 697 INP_INFO_WLOCK(&udbinfo); 698 inp = sotoinpcb(so); 699 if (inp == 0) { 700 INP_INFO_WUNLOCK(&udbinfo); 701 return EINVAL; 702 } 703 INP_LOCK(inp); 704 705 #ifdef INET 706 if (inp->inp_vflag & INP_IPV4) { 707 struct pr_usrreqs *pru; 708 709 pru = inetsw[ip_protox[IPPROTO_UDP]].pr_usrreqs; 710 error = (*pru->pru_disconnect)(so); 711 goto out; 712 } 713 #endif 714 715 if (IN6_IS_ADDR_UNSPECIFIED(&inp->in6p_faddr)) { 716 error = ENOTCONN; 717 goto out; 718 } 719 720 s = splnet(); 721 in6_pcbdisconnect(inp); 722 inp->in6p_laddr = in6addr_any; 723 splx(s); 724 /* XXXRW: so_state locking? */ 725 so->so_state &= ~SS_ISCONNECTED; /* XXX */ 726 out: 727 INP_UNLOCK(inp); 728 INP_INFO_WUNLOCK(&udbinfo); 729 return 0; 730 } 731 732 static int 733 udp6_send(struct socket *so, int flags, struct mbuf *m, struct sockaddr *addr, 734 struct mbuf *control, struct thread *td) 735 { 736 struct inpcb *inp; 737 int error = 0; 738 739 INP_INFO_WLOCK(&udbinfo); 740 inp = sotoinpcb(so); 741 if (inp == 0) { 742 INP_INFO_WUNLOCK(&udbinfo); 743 m_freem(m); 744 return EINVAL; 745 } 746 INP_LOCK(inp); 747 748 if (addr) { 749 if (addr->sa_len != sizeof(struct sockaddr_in6)) { 750 error = EINVAL; 751 goto bad; 752 } 753 if (addr->sa_family != AF_INET6) { 754 error = EAFNOSUPPORT; 755 goto bad; 756 } 757 } 758 759 #ifdef INET 760 if ((inp->inp_flags & IN6P_IPV6_V6ONLY) == 0) { 761 int hasv4addr; 762 struct sockaddr_in6 *sin6 = 0; 763 764 if (addr == 0) 765 hasv4addr = (inp->inp_vflag & INP_IPV4); 766 else { 767 sin6 = (struct sockaddr_in6 *)addr; 768 hasv4addr = IN6_IS_ADDR_V4MAPPED(&sin6->sin6_addr) 769 ? 1 : 0; 770 } 771 if (hasv4addr) { 772 struct pr_usrreqs *pru; 773 774 if (!IN6_IS_ADDR_UNSPECIFIED(&inp->in6p_laddr) && 775 !IN6_IS_ADDR_V4MAPPED(&inp->in6p_laddr)) { 776 /* 777 * when remote addr is IPv4-mapped 778 * address, local addr should not be 779 * an IPv6 address; since you cannot 780 * determine how to map IPv6 source 781 * address to IPv4. 782 */ 783 error = EINVAL; 784 goto out; 785 } 786 if (sin6) 787 in6_sin6_2_sin_in_sock(addr); 788 pru = inetsw[ip_protox[IPPROTO_UDP]].pr_usrreqs; 789 error = ((*pru->pru_send)(so, flags, m, addr, control, 790 td)); 791 /* addr will just be freed in sendit(). */ 792 goto out; 793 } 794 } 795 #endif 796 797 error = udp6_output(inp, m, addr, control, td); 798 out: 799 INP_UNLOCK(inp); 800 INP_INFO_WUNLOCK(&udbinfo); 801 return error; 802 803 bad: 804 INP_UNLOCK(inp); 805 INP_INFO_WUNLOCK(&udbinfo); 806 m_freem(m); 807 return (error); 808 } 809 810 struct pr_usrreqs udp6_usrreqs = { 811 .pru_abort = udp6_abort, 812 .pru_attach = udp6_attach, 813 .pru_bind = udp6_bind, 814 .pru_connect = udp6_connect, 815 .pru_control = in6_control, 816 .pru_detach = udp6_detach, 817 .pru_disconnect = udp6_disconnect, 818 .pru_peeraddr = in6_mapped_peeraddr, 819 .pru_send = udp6_send, 820 .pru_shutdown = udp_shutdown, 821 .pru_sockaddr = in6_mapped_sockaddr, 822 .pru_sosetlabel = in_pcbsosetlabel 823 };
Cache object: 82642f35fd5f81318be7167eb03e56e3
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