udp6_usrreq.c revision 127711
1/* $FreeBSD: head/sys/netinet6/udp6_usrreq.c 127711 2004-04-01 13:48:23Z suz $ */ 2/* $KAME: udp6_usrreq.c,v 1.27 2001/05/21 05:45:10 jinmei Exp $ */ 3 4/* 5 * Copyright (C) 1995, 1996, 1997, and 1998 WIDE Project. 6 * All rights reserved. 7 * 8 * Redistribution and use in source and binary forms, with or without 9 * modification, are permitted provided that the following conditions 10 * are met: 11 * 1. Redistributions of source code must retain the above copyright 12 * notice, this list of conditions and the following disclaimer. 13 * 2. Redistributions in binary form must reproduce the above copyright 14 * notice, this list of conditions and the following disclaimer in the 15 * documentation and/or other materials provided with the distribution. 16 * 3. Neither the name of the project nor the names of its contributors 17 * may be used to endorse or promote products derived from this software 18 * without specific prior written permission. 19 * 20 * THIS SOFTWARE IS PROVIDED BY THE PROJECT AND CONTRIBUTORS ``AS IS'' AND 21 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 22 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 23 * ARE DISCLAIMED. IN NO EVENT SHALL THE PROJECT OR CONTRIBUTORS BE LIABLE 24 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 25 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 26 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 27 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 28 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 29 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 30 * SUCH DAMAGE. 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 * 3. All advertising materials mentioning features or use of this software 46 * must display the following acknowledgement: 47 * This product includes software developed by the University of 48 * California, Berkeley and its contributors. 49 * 4. Neither the name of the University nor the names of its contributors 50 * may be used to endorse or promote products derived from this software 51 * without specific prior written permission. 52 * 53 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND 54 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 55 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 56 * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE 57 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 58 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 59 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 60 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 61 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 62 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 63 * SUCH DAMAGE. 64 * 65 * @(#)udp_var.h 8.1 (Berkeley) 6/10/93 66 */ 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/errno.h> 74#include <sys/kernel.h> 75#include <sys/lock.h> 76#include <sys/mbuf.h> 77#include <sys/proc.h> 78#include <sys/protosw.h> 79#include <sys/signalvar.h> 80#include <sys/socket.h> 81#include <sys/socketvar.h> 82#include <sys/stat.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/ip6.h> 98#include <netinet/icmp6.h> 99#include <netinet/ip_var.h> 100#include <netinet/udp.h> 101#include <netinet/udp_var.h> 102#include <netinet6/ip6protosw.h> 103#include <netinet6/ip6_var.h> 104#include <netinet6/in6_pcb.h> 105#include <netinet6/udp6_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 122extern struct protosw inetsw[]; 123static int udp6_detach __P((struct socket *so)); 124 125int 126udp6_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; 383bad: 384 if (m) 385 m_freem(m); 386 if (opts) 387 m_freem(opts); 388 return IPPROTO_DONE; 389} 390 391void 392udp6_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) __P((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(&udb, sa, uh.uh_dport, 452 (struct sockaddr *)ip6cp->ip6c_src, 453 uh.uh_sport, cmd, cmdarg, notify); 454 } else 455 (void) in6_pcbnotify(&udb, sa, 0, 456 (const struct sockaddr *)sa6_src, 457 0, cmd, cmdarg, notify); 458} 459 460static int 461udp6_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 s = splnet(); 480 inp = in6_pcblookup_hash(&udbinfo, &addrs[1].sin6_addr, 481 addrs[1].sin6_port, 482 &addrs[0].sin6_addr, addrs[0].sin6_port, 483 1, NULL); 484 if (!inp || !inp->inp_socket) { 485 error = ENOENT; 486 goto out; 487 } 488 cru2x(inp->inp_socket->so_cred, &xuc); 489 error = SYSCTL_OUT(req, &xuc, sizeof(struct xucred)); 490out: 491 splx(s); 492 return (error); 493} 494 495SYSCTL_PROC(_net_inet6_udp6, OID_AUTO, getcred, CTLTYPE_OPAQUE|CTLFLAG_RW, 496 0, 0, 497 udp6_getcred, "S,xucred", "Get the xucred of a UDP6 connection"); 498 499static int 500udp6_abort(struct socket *so) 501{ 502 struct inpcb *inp; 503 int s; 504 505 inp = sotoinpcb(so); 506 if (inp == 0) 507 return EINVAL; /* ??? possible? panic instead? */ 508 soisdisconnected(so); 509 s = splnet(); 510 in6_pcbdetach(inp); 511 splx(s); 512 return 0; 513} 514 515static int 516udp6_attach(struct socket *so, int proto, struct thread *td) 517{ 518 struct inpcb *inp; 519 int s, error; 520 521 inp = sotoinpcb(so); 522 if (inp != 0) 523 return EINVAL; 524 525 if (so->so_snd.sb_hiwat == 0 || so->so_rcv.sb_hiwat == 0) { 526 error = soreserve(so, udp_sendspace, udp_recvspace); 527 if (error) 528 return error; 529 } 530 s = splnet(); 531 error = in_pcballoc(so, &udbinfo, "udp6inp"); 532 splx(s); 533 if (error) 534 return error; 535 inp = (struct inpcb *)so->so_pcb; 536 inp->inp_vflag |= INP_IPV6; 537 if (!ip6_v6only) 538 inp->inp_vflag |= INP_IPV4; 539 inp->in6p_hops = -1; /* use kernel default */ 540 inp->in6p_cksum = -1; /* just to be sure */ 541 /* 542 * XXX: ugly!! 543 * IPv4 TTL initialization is necessary for an IPv6 socket as well, 544 * because the socket may be bound to an IPv6 wildcard address, 545 * which may match an IPv4-mapped IPv6 address. 546 */ 547 inp->inp_ip_ttl = ip_defttl; 548 return 0; 549} 550 551static int 552udp6_bind(struct socket *so, struct sockaddr *nam, struct thread *td) 553{ 554 struct inpcb *inp; 555 int s, error; 556 557 inp = sotoinpcb(so); 558 if (inp == 0) 559 return EINVAL; 560 561 inp->inp_vflag &= ~INP_IPV4; 562 inp->inp_vflag |= INP_IPV6; 563 if ((inp->inp_flags & IN6P_IPV6_V6ONLY) == 0) { 564 struct sockaddr_in6 *sin6_p; 565 566 sin6_p = (struct sockaddr_in6 *)nam; 567 568 if (IN6_IS_ADDR_UNSPECIFIED(&sin6_p->sin6_addr)) 569 inp->inp_vflag |= INP_IPV4; 570 else if (IN6_IS_ADDR_V4MAPPED(&sin6_p->sin6_addr)) { 571 struct sockaddr_in sin; 572 573 in6_sin6_2_sin(&sin, sin6_p); 574 inp->inp_vflag |= INP_IPV4; 575 inp->inp_vflag &= ~INP_IPV6; 576 s = splnet(); 577 error = in_pcbbind(inp, (struct sockaddr *)&sin, 578 td->td_ucred); 579 splx(s); 580 return error; 581 } 582 } 583 584 s = splnet(); 585 error = in6_pcbbind(inp, nam, td->td_ucred); 586 splx(s); 587 return error; 588} 589 590static int 591udp6_connect(struct socket *so, struct sockaddr *nam, struct thread *td) 592{ 593 struct inpcb *inp; 594 int s, error; 595 596 inp = sotoinpcb(so); 597 if (inp == 0) 598 return EINVAL; 599 600 if ((inp->inp_flags & IN6P_IPV6_V6ONLY) == 0) { 601 struct sockaddr_in6 *sin6_p; 602 603 sin6_p = (struct sockaddr_in6 *)nam; 604 if (IN6_IS_ADDR_V4MAPPED(&sin6_p->sin6_addr)) { 605 struct sockaddr_in sin; 606 607 if (inp->inp_faddr.s_addr != INADDR_ANY) 608 return EISCONN; 609 in6_sin6_2_sin(&sin, sin6_p); 610 s = splnet(); 611 error = in_pcbconnect(inp, (struct sockaddr *)&sin, 612 td->td_ucred); 613 splx(s); 614 if (error == 0) { 615 inp->inp_vflag |= INP_IPV4; 616 inp->inp_vflag &= ~INP_IPV6; 617 soisconnected(so); 618 } 619 return error; 620 } 621 } 622 if (!IN6_IS_ADDR_UNSPECIFIED(&inp->in6p_faddr)) 623 return EISCONN; 624 s = splnet(); 625 error = in6_pcbconnect(inp, nam, td->td_ucred); 626 splx(s); 627 if (error == 0) { 628 if (!ip6_v6only) { /* should be non mapped addr */ 629 inp->inp_vflag &= ~INP_IPV4; 630 inp->inp_vflag |= INP_IPV6; 631 } 632 soisconnected(so); 633 } 634 return error; 635} 636 637static int 638udp6_detach(struct socket *so) 639{ 640 struct inpcb *inp; 641 int s; 642 643 inp = sotoinpcb(so); 644 if (inp == 0) 645 return EINVAL; 646 s = splnet(); 647 in6_pcbdetach(inp); 648 splx(s); 649 return 0; 650} 651 652static int 653udp6_disconnect(struct socket *so) 654{ 655 struct inpcb *inp; 656 int s; 657 658 inp = sotoinpcb(so); 659 if (inp == 0) 660 return EINVAL; 661 662#ifdef INET 663 if (inp->inp_vflag & INP_IPV4) { 664 struct pr_usrreqs *pru; 665 666 pru = inetsw[ip_protox[IPPROTO_UDP]].pr_usrreqs; 667 return ((*pru->pru_disconnect)(so)); 668 } 669#endif 670 671 if (IN6_IS_ADDR_UNSPECIFIED(&inp->in6p_faddr)) 672 return ENOTCONN; 673 674 s = splnet(); 675 in6_pcbdisconnect(inp); 676 inp->in6p_laddr = in6addr_any; 677 splx(s); 678 so->so_state &= ~SS_ISCONNECTED; /* XXX */ 679 return 0; 680} 681 682static int 683udp6_send(struct socket *so, int flags, struct mbuf *m, struct sockaddr *addr, 684 struct mbuf *control, struct thread *td) 685{ 686 struct inpcb *inp; 687 int error = 0; 688 689 inp = sotoinpcb(so); 690 if (inp == 0) { 691 error = EINVAL; 692 goto bad; 693 } 694 695 if (addr) { 696 if (addr->sa_len != sizeof(struct sockaddr_in6)) { 697 error = EINVAL; 698 goto bad; 699 } 700 if (addr->sa_family != AF_INET6) { 701 error = EAFNOSUPPORT; 702 goto bad; 703 } 704 } 705 706#ifdef INET 707 if (!ip6_v6only) { 708 int hasv4addr; 709 struct sockaddr_in6 *sin6 = 0; 710 711 if (addr == 0) 712 hasv4addr = (inp->inp_vflag & INP_IPV4); 713 else { 714 sin6 = (struct sockaddr_in6 *)addr; 715 hasv4addr = IN6_IS_ADDR_V4MAPPED(&sin6->sin6_addr) 716 ? 1 : 0; 717 } 718 if (hasv4addr) { 719 struct pr_usrreqs *pru; 720 721 if ((inp->inp_flags & IN6P_IPV6_V6ONLY)) { 722 /* 723 * since a user of this socket set the 724 * IPV6_V6ONLY flag, we discard this 725 * datagram destined to a v4 addr. 726 */ 727 return EINVAL; 728 } 729 if (!IN6_IS_ADDR_UNSPECIFIED(&inp->in6p_laddr) && 730 !IN6_IS_ADDR_V4MAPPED(&inp->in6p_laddr)) { 731 /* 732 * when remote addr is IPv4-mapped 733 * address, local addr should not be 734 * an IPv6 address; since you cannot 735 * determine how to map IPv6 source 736 * address to IPv4. 737 */ 738 return EINVAL; 739 } 740 if (sin6) 741 in6_sin6_2_sin_in_sock(addr); 742 pru = inetsw[ip_protox[IPPROTO_UDP]].pr_usrreqs; 743 error = ((*pru->pru_send)(so, flags, m, addr, control, 744 td)); 745 /* addr will just be freed in sendit(). */ 746 return error; 747 } 748 } 749#endif 750 751 return udp6_output(inp, m, addr, control, td); 752 753 bad: 754 m_freem(m); 755 return (error); 756} 757 758struct pr_usrreqs udp6_usrreqs = { 759 udp6_abort, pru_accept_notsupp, udp6_attach, udp6_bind, udp6_connect, 760 pru_connect2_notsupp, in6_control, udp6_detach, udp6_disconnect, 761 pru_listen_notsupp, in6_mapped_peeraddr, pru_rcvd_notsupp, 762 pru_rcvoob_notsupp, udp6_send, pru_sense_null, udp_shutdown, 763 in6_mapped_sockaddr, sosend, soreceive, sopoll, in_pcbsosetlabel 764}; 765