udp6_usrreq.c revision 128019
1/* $FreeBSD: head/sys/netinet6/udp6_usrreq.c 128019 2004-04-07 20:46:16Z imp $ */ 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 * 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_var.h 8.1 (Berkeley) 6/10/93 62 */ 63 64#include "opt_inet.h" 65#include "opt_inet6.h" 66#include "opt_ipsec.h" 67 68#include <sys/param.h> 69#include <sys/errno.h> 70#include <sys/kernel.h> 71#include <sys/lock.h> 72#include <sys/mbuf.h> 73#include <sys/proc.h> 74#include <sys/protosw.h> 75#include <sys/signalvar.h> 76#include <sys/socket.h> 77#include <sys/socketvar.h> 78#include <sys/stat.h> 79#include <sys/sx.h> 80#include <sys/sysctl.h> 81#include <sys/syslog.h> 82#include <sys/systm.h> 83 84#include <net/if.h> 85#include <net/if_types.h> 86#include <net/route.h> 87 88#include <netinet/in.h> 89#include <netinet/in_pcb.h> 90#include <netinet/in_systm.h> 91#include <netinet/in_var.h> 92#include <netinet/ip.h> 93#include <netinet/ip6.h> 94#include <netinet/icmp6.h> 95#include <netinet/ip_var.h> 96#include <netinet/udp.h> 97#include <netinet/udp_var.h> 98#include <netinet6/ip6protosw.h> 99#include <netinet6/ip6_var.h> 100#include <netinet6/in6_pcb.h> 101#include <netinet6/udp6_var.h> 102 103#ifdef IPSEC 104#include <netinet6/ipsec.h> 105#include <netinet6/ipsec6.h> 106#endif /* IPSEC */ 107 108#ifdef FAST_IPSEC 109#include <netipsec/ipsec.h> 110#include <netipsec/ipsec6.h> 111#endif /* FAST_IPSEC */ 112 113/* 114 * UDP protocol inplementation. 115 * Per RFC 768, August, 1980. 116 */ 117 118extern struct protosw inetsw[]; 119static int udp6_detach __P((struct socket *so)); 120 121int 122udp6_input(mp, offp, proto) 123 struct mbuf **mp; 124 int *offp, proto; 125{ 126 struct mbuf *m = *mp, *opts; 127 register struct ip6_hdr *ip6; 128 register struct udphdr *uh; 129 register struct inpcb *in6p; 130 int off = *offp; 131 int plen, ulen; 132 struct sockaddr_in6 fromsa; 133 134 opts = NULL; 135 136 ip6 = mtod(m, struct ip6_hdr *); 137 138 if (faithprefix_p != NULL && (*faithprefix_p)(&ip6->ip6_dst)) { 139 /* XXX send icmp6 host/port unreach? */ 140 m_freem(m); 141 return IPPROTO_DONE; 142 } 143 144#ifndef PULLDOWN_TEST 145 IP6_EXTHDR_CHECK(m, off, sizeof(struct udphdr), IPPROTO_DONE); 146 ip6 = mtod(m, struct ip6_hdr *); 147 uh = (struct udphdr *)((caddr_t)ip6 + off); 148#else 149 IP6_EXTHDR_GET(uh, struct udphdr *, m, off, sizeof(*uh)); 150 if (!uh) 151 return IPPROTO_DONE; 152#endif 153 154 udpstat.udps_ipackets++; 155 156 plen = ntohs(ip6->ip6_plen) - off + sizeof(*ip6); 157 ulen = ntohs((u_short)uh->uh_ulen); 158 159 if (plen != ulen) { 160 udpstat.udps_badlen++; 161 goto bad; 162 } 163 164 /* 165 * Checksum extended UDP header and data. 166 */ 167 if (uh->uh_sum == 0) { 168 udpstat.udps_nosum++; 169 goto bad; 170 } 171 if (in6_cksum(m, IPPROTO_UDP, off, ulen) != 0) { 172 udpstat.udps_badsum++; 173 goto bad; 174 } 175 176 if (IN6_IS_ADDR_MULTICAST(&ip6->ip6_dst)) { 177 struct inpcb *last; 178 179 /* 180 * Deliver a multicast datagram to all sockets 181 * for which the local and remote addresses and ports match 182 * those of the incoming datagram. This allows more than 183 * one process to receive multicasts on the same port. 184 * (This really ought to be done for unicast datagrams as 185 * well, but that would cause problems with existing 186 * applications that open both address-specific sockets and 187 * a wildcard socket listening to the same port -- they would 188 * end up receiving duplicates of every unicast datagram. 189 * Those applications open the multiple sockets to overcome an 190 * inadequacy of the UDP socket interface, but for backwards 191 * compatibility we avoid the problem here rather than 192 * fixing the interface. Maybe 4.5BSD will remedy this?) 193 */ 194 195 /* 196 * In a case that laddr should be set to the link-local 197 * address (this happens in RIPng), the multicast address 198 * specified in the received packet does not match with 199 * laddr. To cure this situation, the matching is relaxed 200 * if the receiving interface is the same as one specified 201 * in the socket and if the destination multicast address 202 * matches one of the multicast groups specified in the socket. 203 */ 204 205 /* 206 * Construct sockaddr format source address. 207 */ 208 init_sin6(&fromsa, m); 209 fromsa.sin6_port = uh->uh_sport; 210 /* 211 * KAME note: traditionally we dropped udpiphdr from mbuf here. 212 * We need udphdr for IPsec processing so we do that later. 213 */ 214 215 /* 216 * Locate pcb(s) for datagram. 217 * (Algorithm copied from raw_intr().) 218 */ 219 last = NULL; 220 LIST_FOREACH(in6p, &udb, inp_list) { 221 if ((in6p->inp_vflag & INP_IPV6) == 0) 222 continue; 223 if (in6p->in6p_lport != uh->uh_dport) 224 continue; 225 if (!IN6_IS_ADDR_UNSPECIFIED(&in6p->in6p_laddr)) { 226 if (!IN6_ARE_ADDR_EQUAL(&in6p->in6p_laddr, 227 &ip6->ip6_dst)) 228 continue; 229 } 230 if (!IN6_IS_ADDR_UNSPECIFIED(&in6p->in6p_faddr)) { 231 if (!IN6_ARE_ADDR_EQUAL(&in6p->in6p_faddr, 232 &ip6->ip6_src) || 233 in6p->in6p_fport != uh->uh_sport) 234 continue; 235 } 236 237 if (last != NULL) { 238 struct mbuf *n; 239 240#if defined(IPSEC) || defined(FAST_IPSEC) 241 /* 242 * Check AH/ESP integrity. 243 */ 244 if (ipsec6_in_reject(m, last)) { 245#ifdef IPSEC 246 ipsec6stat.in_polvio++; 247#endif /* IPSEC */ 248 /* do not inject data into pcb */ 249 } else 250#endif /*IPSEC || FAST_IPSEC*/ 251 if ((n = m_copy(m, 0, M_COPYALL)) != NULL) { 252 /* 253 * KAME NOTE: do not 254 * m_copy(m, offset, ...) above. 255 * sbappendaddr() expects M_PKTHDR, 256 * and m_copy() will copy M_PKTHDR 257 * only if offset is 0. 258 */ 259 if (last->in6p_flags & IN6P_CONTROLOPTS 260 || last->in6p_socket->so_options & SO_TIMESTAMP) 261 ip6_savecontrol(last, n, &opts); 262 263 m_adj(n, off + sizeof(struct udphdr)); 264 if (sbappendaddr(&last->in6p_socket->so_rcv, 265 (struct sockaddr *)&fromsa, 266 n, opts) == 0) { 267 m_freem(n); 268 if (opts) 269 m_freem(opts); 270 udpstat.udps_fullsock++; 271 } else 272 sorwakeup(last->in6p_socket); 273 opts = NULL; 274 } 275 } 276 last = in6p; 277 /* 278 * Don't look for additional matches if this one does 279 * not have either the SO_REUSEPORT or SO_REUSEADDR 280 * socket options set. This heuristic avoids searching 281 * through all pcbs in the common case of a non-shared 282 * port. It assumes that an application will never 283 * clear these options after setting them. 284 */ 285 if ((last->in6p_socket->so_options & 286 (SO_REUSEPORT|SO_REUSEADDR)) == 0) 287 break; 288 } 289 290 if (last == NULL) { 291 /* 292 * No matching pcb found; discard datagram. 293 * (No need to send an ICMP Port Unreachable 294 * for a broadcast or multicast datgram.) 295 */ 296 udpstat.udps_noport++; 297 udpstat.udps_noportmcast++; 298 goto bad; 299 } 300#if defined(IPSEC) || defined(FAST_IPSEC) 301 /* 302 * Check AH/ESP integrity. 303 */ 304 if (ipsec6_in_reject(m, last)) { 305#ifdef IPSEC 306 ipsec6stat.in_polvio++; 307#endif /* IPSEC */ 308 goto bad; 309 } 310#endif /*IPSEC || FAST_IPSEC*/ 311 if (last->in6p_flags & IN6P_CONTROLOPTS 312 || last->in6p_socket->so_options & SO_TIMESTAMP) 313 ip6_savecontrol(last, m, &opts); 314 315 m_adj(m, off + sizeof(struct udphdr)); 316 if (sbappendaddr(&last->in6p_socket->so_rcv, 317 (struct sockaddr *)&fromsa, 318 m, opts) == 0) { 319 udpstat.udps_fullsock++; 320 goto bad; 321 } 322 sorwakeup(last->in6p_socket); 323 return IPPROTO_DONE; 324 } 325 /* 326 * Locate pcb for datagram. 327 */ 328 in6p = in6_pcblookup_hash(&udbinfo, &ip6->ip6_src, uh->uh_sport, 329 &ip6->ip6_dst, uh->uh_dport, 1, 330 m->m_pkthdr.rcvif); 331 if (in6p == 0) { 332 if (log_in_vain) { 333 char buf[INET6_ADDRSTRLEN]; 334 335 strcpy(buf, ip6_sprintf(&ip6->ip6_dst)); 336 log(LOG_INFO, 337 "Connection attempt to UDP [%s]:%d from [%s]:%d\n", 338 buf, ntohs(uh->uh_dport), 339 ip6_sprintf(&ip6->ip6_src), ntohs(uh->uh_sport)); 340 } 341 udpstat.udps_noport++; 342 if (m->m_flags & M_MCAST) { 343 printf("UDP6: M_MCAST is set in a unicast packet.\n"); 344 udpstat.udps_noportmcast++; 345 goto bad; 346 } 347 icmp6_error(m, ICMP6_DST_UNREACH, ICMP6_DST_UNREACH_NOPORT, 0); 348 return IPPROTO_DONE; 349 } 350#if defined(IPSEC) || defined(FAST_IPSEC) 351 /* 352 * Check AH/ESP integrity. 353 */ 354 if (ipsec6_in_reject(m, in6p)) { 355#ifdef IPSEC 356 ipsec6stat.in_polvio++; 357#endif /* IPSEC */ 358 goto bad; 359 } 360#endif /*IPSEC || FAST_IPSEC*/ 361 362 /* 363 * Construct sockaddr format source address. 364 * Stuff source address and datagram in user buffer. 365 */ 366 init_sin6(&fromsa, m); 367 fromsa.sin6_port = uh->uh_sport; 368 if (in6p->in6p_flags & IN6P_CONTROLOPTS 369 || in6p->in6p_socket->so_options & SO_TIMESTAMP) 370 ip6_savecontrol(in6p, m, &opts); 371 m_adj(m, off + sizeof(struct udphdr)); 372 if (sbappendaddr(&in6p->in6p_socket->so_rcv, 373 (struct sockaddr *)&fromsa, m, opts) == 0) { 374 udpstat.udps_fullsock++; 375 goto bad; 376 } 377 sorwakeup(in6p->in6p_socket); 378 return IPPROTO_DONE; 379bad: 380 if (m) 381 m_freem(m); 382 if (opts) 383 m_freem(opts); 384 return IPPROTO_DONE; 385} 386 387void 388udp6_ctlinput(cmd, sa, d) 389 int cmd; 390 struct sockaddr *sa; 391 void *d; 392{ 393 struct udphdr uh; 394 struct ip6_hdr *ip6; 395 struct mbuf *m; 396 int off = 0; 397 struct ip6ctlparam *ip6cp = NULL; 398 const struct sockaddr_in6 *sa6_src = NULL; 399 void *cmdarg; 400 struct inpcb *(*notify) __P((struct inpcb *, int)) = udp_notify; 401 struct udp_portonly { 402 u_int16_t uh_sport; 403 u_int16_t uh_dport; 404 } *uhp; 405 406 if (sa->sa_family != AF_INET6 || 407 sa->sa_len != sizeof(struct sockaddr_in6)) 408 return; 409 410 if ((unsigned)cmd >= PRC_NCMDS) 411 return; 412 if (PRC_IS_REDIRECT(cmd)) 413 notify = in6_rtchange, d = NULL; 414 else if (cmd == PRC_HOSTDEAD) 415 d = NULL; 416 else if (inet6ctlerrmap[cmd] == 0) 417 return; 418 419 /* if the parameter is from icmp6, decode it. */ 420 if (d != NULL) { 421 ip6cp = (struct ip6ctlparam *)d; 422 m = ip6cp->ip6c_m; 423 ip6 = ip6cp->ip6c_ip6; 424 off = ip6cp->ip6c_off; 425 cmdarg = ip6cp->ip6c_cmdarg; 426 sa6_src = ip6cp->ip6c_src; 427 } else { 428 m = NULL; 429 ip6 = NULL; 430 cmdarg = NULL; 431 sa6_src = &sa6_any; 432 } 433 434 if (ip6) { 435 /* 436 * XXX: We assume that when IPV6 is non NULL, 437 * M and OFF are valid. 438 */ 439 440 /* check if we can safely examine src and dst ports */ 441 if (m->m_pkthdr.len < off + sizeof(*uhp)) 442 return; 443 444 bzero(&uh, sizeof(uh)); 445 m_copydata(m, off, sizeof(*uhp), (caddr_t)&uh); 446 447 (void) in6_pcbnotify(&udb, sa, uh.uh_dport, 448 (struct sockaddr *)ip6cp->ip6c_src, 449 uh.uh_sport, cmd, cmdarg, notify); 450 } else 451 (void) in6_pcbnotify(&udb, sa, 0, 452 (const struct sockaddr *)sa6_src, 453 0, cmd, cmdarg, notify); 454} 455 456static int 457udp6_getcred(SYSCTL_HANDLER_ARGS) 458{ 459 struct xucred xuc; 460 struct sockaddr_in6 addrs[2]; 461 struct inpcb *inp; 462 int error, s; 463 464 error = suser(req->td); 465 if (error) 466 return (error); 467 468 if (req->newlen != sizeof(addrs)) 469 return (EINVAL); 470 if (req->oldlen != sizeof(struct xucred)) 471 return (EINVAL); 472 error = SYSCTL_IN(req, addrs, sizeof(addrs)); 473 if (error) 474 return (error); 475 s = splnet(); 476 inp = in6_pcblookup_hash(&udbinfo, &addrs[1].sin6_addr, 477 addrs[1].sin6_port, 478 &addrs[0].sin6_addr, addrs[0].sin6_port, 479 1, NULL); 480 if (!inp || !inp->inp_socket) { 481 error = ENOENT; 482 goto out; 483 } 484 cru2x(inp->inp_socket->so_cred, &xuc); 485 error = SYSCTL_OUT(req, &xuc, sizeof(struct xucred)); 486out: 487 splx(s); 488 return (error); 489} 490 491SYSCTL_PROC(_net_inet6_udp6, OID_AUTO, getcred, CTLTYPE_OPAQUE|CTLFLAG_RW, 492 0, 0, 493 udp6_getcred, "S,xucred", "Get the xucred of a UDP6 connection"); 494 495static int 496udp6_abort(struct socket *so) 497{ 498 struct inpcb *inp; 499 int s; 500 501 inp = sotoinpcb(so); 502 if (inp == 0) 503 return EINVAL; /* ??? possible? panic instead? */ 504 soisdisconnected(so); 505 s = splnet(); 506 in6_pcbdetach(inp); 507 splx(s); 508 return 0; 509} 510 511static int 512udp6_attach(struct socket *so, int proto, struct thread *td) 513{ 514 struct inpcb *inp; 515 int s, error; 516 517 inp = sotoinpcb(so); 518 if (inp != 0) 519 return EINVAL; 520 521 if (so->so_snd.sb_hiwat == 0 || so->so_rcv.sb_hiwat == 0) { 522 error = soreserve(so, udp_sendspace, udp_recvspace); 523 if (error) 524 return error; 525 } 526 s = splnet(); 527 error = in_pcballoc(so, &udbinfo, "udp6inp"); 528 splx(s); 529 if (error) 530 return error; 531 inp = (struct inpcb *)so->so_pcb; 532 inp->inp_vflag |= INP_IPV6; 533 if (!ip6_v6only) 534 inp->inp_vflag |= INP_IPV4; 535 inp->in6p_hops = -1; /* use kernel default */ 536 inp->in6p_cksum = -1; /* just to be sure */ 537 /* 538 * XXX: ugly!! 539 * IPv4 TTL initialization is necessary for an IPv6 socket as well, 540 * because the socket may be bound to an IPv6 wildcard address, 541 * which may match an IPv4-mapped IPv6 address. 542 */ 543 inp->inp_ip_ttl = ip_defttl; 544 return 0; 545} 546 547static int 548udp6_bind(struct socket *so, struct sockaddr *nam, struct thread *td) 549{ 550 struct inpcb *inp; 551 int s, error; 552 553 inp = sotoinpcb(so); 554 if (inp == 0) 555 return EINVAL; 556 557 inp->inp_vflag &= ~INP_IPV4; 558 inp->inp_vflag |= INP_IPV6; 559 if ((inp->inp_flags & IN6P_IPV6_V6ONLY) == 0) { 560 struct sockaddr_in6 *sin6_p; 561 562 sin6_p = (struct sockaddr_in6 *)nam; 563 564 if (IN6_IS_ADDR_UNSPECIFIED(&sin6_p->sin6_addr)) 565 inp->inp_vflag |= INP_IPV4; 566 else if (IN6_IS_ADDR_V4MAPPED(&sin6_p->sin6_addr)) { 567 struct sockaddr_in sin; 568 569 in6_sin6_2_sin(&sin, sin6_p); 570 inp->inp_vflag |= INP_IPV4; 571 inp->inp_vflag &= ~INP_IPV6; 572 s = splnet(); 573 error = in_pcbbind(inp, (struct sockaddr *)&sin, 574 td->td_ucred); 575 splx(s); 576 return error; 577 } 578 } 579 580 s = splnet(); 581 error = in6_pcbbind(inp, nam, td->td_ucred); 582 splx(s); 583 return error; 584} 585 586static int 587udp6_connect(struct socket *so, struct sockaddr *nam, struct thread *td) 588{ 589 struct inpcb *inp; 590 int s, error; 591 592 inp = sotoinpcb(so); 593 if (inp == 0) 594 return EINVAL; 595 596 if ((inp->inp_flags & IN6P_IPV6_V6ONLY) == 0) { 597 struct sockaddr_in6 *sin6_p; 598 599 sin6_p = (struct sockaddr_in6 *)nam; 600 if (IN6_IS_ADDR_V4MAPPED(&sin6_p->sin6_addr)) { 601 struct sockaddr_in sin; 602 603 if (inp->inp_faddr.s_addr != INADDR_ANY) 604 return EISCONN; 605 in6_sin6_2_sin(&sin, sin6_p); 606 s = splnet(); 607 error = in_pcbconnect(inp, (struct sockaddr *)&sin, 608 td->td_ucred); 609 splx(s); 610 if (error == 0) { 611 inp->inp_vflag |= INP_IPV4; 612 inp->inp_vflag &= ~INP_IPV6; 613 soisconnected(so); 614 } 615 return error; 616 } 617 } 618 if (!IN6_IS_ADDR_UNSPECIFIED(&inp->in6p_faddr)) 619 return EISCONN; 620 s = splnet(); 621 error = in6_pcbconnect(inp, nam, td->td_ucred); 622 splx(s); 623 if (error == 0) { 624 if (!ip6_v6only) { /* should be non mapped addr */ 625 inp->inp_vflag &= ~INP_IPV4; 626 inp->inp_vflag |= INP_IPV6; 627 } 628 soisconnected(so); 629 } 630 return error; 631} 632 633static int 634udp6_detach(struct socket *so) 635{ 636 struct inpcb *inp; 637 int s; 638 639 inp = sotoinpcb(so); 640 if (inp == 0) 641 return EINVAL; 642 s = splnet(); 643 in6_pcbdetach(inp); 644 splx(s); 645 return 0; 646} 647 648static int 649udp6_disconnect(struct socket *so) 650{ 651 struct inpcb *inp; 652 int s; 653 654 inp = sotoinpcb(so); 655 if (inp == 0) 656 return EINVAL; 657 658#ifdef INET 659 if (inp->inp_vflag & INP_IPV4) { 660 struct pr_usrreqs *pru; 661 662 pru = inetsw[ip_protox[IPPROTO_UDP]].pr_usrreqs; 663 return ((*pru->pru_disconnect)(so)); 664 } 665#endif 666 667 if (IN6_IS_ADDR_UNSPECIFIED(&inp->in6p_faddr)) 668 return ENOTCONN; 669 670 s = splnet(); 671 in6_pcbdisconnect(inp); 672 inp->in6p_laddr = in6addr_any; 673 splx(s); 674 so->so_state &= ~SS_ISCONNECTED; /* XXX */ 675 return 0; 676} 677 678static int 679udp6_send(struct socket *so, int flags, struct mbuf *m, struct sockaddr *addr, 680 struct mbuf *control, struct thread *td) 681{ 682 struct inpcb *inp; 683 int error = 0; 684 685 inp = sotoinpcb(so); 686 if (inp == 0) { 687 error = EINVAL; 688 goto bad; 689 } 690 691 if (addr) { 692 if (addr->sa_len != sizeof(struct sockaddr_in6)) { 693 error = EINVAL; 694 goto bad; 695 } 696 if (addr->sa_family != AF_INET6) { 697 error = EAFNOSUPPORT; 698 goto bad; 699 } 700 } 701 702#ifdef INET 703 if (!ip6_v6only) { 704 int hasv4addr; 705 struct sockaddr_in6 *sin6 = 0; 706 707 if (addr == 0) 708 hasv4addr = (inp->inp_vflag & INP_IPV4); 709 else { 710 sin6 = (struct sockaddr_in6 *)addr; 711 hasv4addr = IN6_IS_ADDR_V4MAPPED(&sin6->sin6_addr) 712 ? 1 : 0; 713 } 714 if (hasv4addr) { 715 struct pr_usrreqs *pru; 716 717 if ((inp->inp_flags & IN6P_IPV6_V6ONLY)) { 718 /* 719 * since a user of this socket set the 720 * IPV6_V6ONLY flag, we discard this 721 * datagram destined to a v4 addr. 722 */ 723 return EINVAL; 724 } 725 if (!IN6_IS_ADDR_UNSPECIFIED(&inp->in6p_laddr) && 726 !IN6_IS_ADDR_V4MAPPED(&inp->in6p_laddr)) { 727 /* 728 * when remote addr is IPv4-mapped 729 * address, local addr should not be 730 * an IPv6 address; since you cannot 731 * determine how to map IPv6 source 732 * address to IPv4. 733 */ 734 return EINVAL; 735 } 736 if (sin6) 737 in6_sin6_2_sin_in_sock(addr); 738 pru = inetsw[ip_protox[IPPROTO_UDP]].pr_usrreqs; 739 error = ((*pru->pru_send)(so, flags, m, addr, control, 740 td)); 741 /* addr will just be freed in sendit(). */ 742 return error; 743 } 744 } 745#endif 746 747 return udp6_output(inp, m, addr, control, td); 748 749 bad: 750 m_freem(m); 751 return (error); 752} 753 754struct pr_usrreqs udp6_usrreqs = { 755 udp6_abort, pru_accept_notsupp, udp6_attach, udp6_bind, udp6_connect, 756 pru_connect2_notsupp, in6_control, udp6_detach, udp6_disconnect, 757 pru_listen_notsupp, in6_mapped_peeraddr, pru_rcvd_notsupp, 758 pru_rcvoob_notsupp, udp6_send, pru_sense_null, udp_shutdown, 759 in6_mapped_sockaddr, sosend, soreceive, sopoll, in_pcbsosetlabel 760}; 761