1 /* $FreeBSD$ */ 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 */ 121 122 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 else if (in6_cksum(m, IPPROTO_UDP, off, ulen) != 0) { 174 udpstat.udps_badsum++; 175 goto bad; 176 } 177 178 if (IN6_IS_ADDR_MULTICAST(&ip6->ip6_dst)) { 179 struct inpcb *last; 180 181 /* 182 * Deliver a multicast datagram to all sockets 183 * for which the local and remote addresses and ports match 184 * those of the incoming datagram. This allows more than 185 * one process to receive multicasts on the same port. 186 * (This really ought to be done for unicast datagrams as 187 * well, but that would cause problems with existing 188 * applications that open both address-specific sockets and 189 * a wildcard socket listening to the same port -- they would 190 * end up receiving duplicates of every unicast datagram. 191 * Those applications open the multiple sockets to overcome an 192 * inadequacy of the UDP socket interface, but for backwards 193 * compatibility we avoid the problem here rather than 194 * fixing the interface. Maybe 4.5BSD will remedy this?) 195 */ 196 197 /* 198 * In a case that laddr should be set to the link-local 199 * address (this happens in RIPng), the multicast address 200 * specified in the received packet does not match with 201 * laddr. To cure this situation, the matching is relaxed 202 * if the receiving interface is the same as one specified 203 * in the socket and if the destination multicast address 204 * matches one of the multicast groups specified in the socket. 205 */ 206 207 /* 208 * Construct sockaddr format source address. 209 */ 210 init_sin6(&fromsa, m); 211 fromsa.sin6_port = uh->uh_sport; 212 /* 213 * KAME note: traditionally we dropped udpiphdr from mbuf here. 214 * We need udphdr for IPsec processing so we do that later. 215 */ 216 217 /* 218 * Locate pcb(s) for datagram. 219 * (Algorithm copied from raw_intr().) 220 */ 221 last = NULL; 222 LIST_FOREACH(in6p, &udb, inp_list) { 223 if ((in6p->inp_vflag & INP_IPV6) == 0) 224 continue; 225 if (in6p->in6p_lport != uh->uh_dport) 226 continue; 227 if (!IN6_IS_ADDR_UNSPECIFIED(&in6p->in6p_laddr)) { 228 if (!IN6_ARE_ADDR_EQUAL(&in6p->in6p_laddr, 229 &ip6->ip6_dst)) 230 continue; 231 } 232 if (!IN6_IS_ADDR_UNSPECIFIED(&in6p->in6p_faddr)) { 233 if (!IN6_ARE_ADDR_EQUAL(&in6p->in6p_faddr, 234 &ip6->ip6_src) || 235 in6p->in6p_fport != uh->uh_sport) 236 continue; 237 } 238 239 if (last != NULL) { 240 struct mbuf *n; 241 242 #if defined(IPSEC) || defined(FAST_IPSEC) 243 /* 244 * Check AH/ESP integrity. 245 */ 246 if (ipsec6_in_reject(m, last)) { 247 #ifdef IPSEC 248 ipsec6stat.in_polvio++; 249 #endif /* IPSEC */ 250 /* do not inject data into pcb */ 251 } else 252 #endif /*IPSEC || FAST_IPSEC*/ 253 if ((n = m_copy(m, 0, M_COPYALL)) != NULL) { 254 /* 255 * KAME NOTE: do not 256 * m_copy(m, offset, ...) above. 257 * sbappendaddr() expects M_PKTHDR, 258 * and m_copy() will copy M_PKTHDR 259 * only if offset is 0. 260 */ 261 if (last->in6p_flags & IN6P_CONTROLOPTS 262 || last->in6p_socket->so_options & SO_TIMESTAMP) 263 ip6_savecontrol(last, n, &opts); 264 265 m_adj(n, off + sizeof(struct udphdr)); 266 if (sbappendaddr(&last->in6p_socket->so_rcv, 267 (struct sockaddr *)&fromsa, 268 n, opts) == 0) { 269 m_freem(n); 270 if (opts) 271 m_freem(opts); 272 udpstat.udps_fullsock++; 273 } else 274 sorwakeup(last->in6p_socket); 275 opts = NULL; 276 } 277 } 278 last = in6p; 279 /* 280 * Don't look for additional matches if this one does 281 * not have either the SO_REUSEPORT or SO_REUSEADDR 282 * socket options set. This heuristic avoids searching 283 * through all pcbs in the common case of a non-shared 284 * port. It assumes that an application will never 285 * clear these options after setting them. 286 */ 287 if ((last->in6p_socket->so_options & 288 (SO_REUSEPORT|SO_REUSEADDR)) == 0) 289 break; 290 } 291 292 if (last == NULL) { 293 /* 294 * No matching pcb found; discard datagram. 295 * (No need to send an ICMP Port Unreachable 296 * for a broadcast or multicast datgram.) 297 */ 298 udpstat.udps_noport++; 299 udpstat.udps_noportmcast++; 300 goto bad; 301 } 302 #if defined(IPSEC) || defined(FAST_IPSEC) 303 /* 304 * Check AH/ESP integrity. 305 */ 306 if (ipsec6_in_reject(m, last)) { 307 #ifdef IPSEC 308 ipsec6stat.in_polvio++; 309 #endif /* IPSEC */ 310 goto bad; 311 } 312 #endif /*IPSEC || FAST_IPSEC*/ 313 if (last->in6p_flags & IN6P_CONTROLOPTS 314 || last->in6p_socket->so_options & SO_TIMESTAMP) 315 ip6_savecontrol(last, m, &opts); 316 317 m_adj(m, off + sizeof(struct udphdr)); 318 if (sbappendaddr(&last->in6p_socket->so_rcv, 319 (struct sockaddr *)&fromsa, 320 m, opts) == 0) { 321 udpstat.udps_fullsock++; 322 goto bad; 323 } 324 sorwakeup(last->in6p_socket); 325 return IPPROTO_DONE; 326 } 327 /* 328 * Locate pcb for datagram. 329 */ 330 in6p = in6_pcblookup_hash(&udbinfo, &ip6->ip6_src, uh->uh_sport, 331 &ip6->ip6_dst, uh->uh_dport, 1, 332 m->m_pkthdr.rcvif); 333 if (in6p == 0) { 334 if (log_in_vain) { 335 char buf[INET6_ADDRSTRLEN]; 336 337 strcpy(buf, ip6_sprintf(&ip6->ip6_dst)); 338 log(LOG_INFO, 339 "Connection attempt to UDP [%s]:%d from [%s]:%d\n", 340 buf, ntohs(uh->uh_dport), 341 ip6_sprintf(&ip6->ip6_src), ntohs(uh->uh_sport)); 342 } 343 udpstat.udps_noport++; 344 if (m->m_flags & M_MCAST) { 345 printf("UDP6: M_MCAST is set in a unicast packet.\n"); 346 udpstat.udps_noportmcast++; 347 goto bad; 348 } 349 icmp6_error(m, ICMP6_DST_UNREACH, ICMP6_DST_UNREACH_NOPORT, 0); 350 return IPPROTO_DONE; 351 } 352 #if defined(IPSEC) || defined(FAST_IPSEC) 353 /* 354 * Check AH/ESP integrity. 355 */ 356 if (ipsec6_in_reject(m, in6p)) { 357 #ifdef IPSEC 358 ipsec6stat.in_polvio++; 359 #endif /* IPSEC */ 360 goto bad; 361 } 362 #endif /*IPSEC || FAST_IPSEC*/ 363 364 /* 365 * Construct sockaddr format source address. 366 * Stuff source address and datagram in user buffer. 367 */ 368 init_sin6(&fromsa, m); 369 fromsa.sin6_port = uh->uh_sport; 370 if (in6p->in6p_flags & IN6P_CONTROLOPTS 371 || in6p->in6p_socket->so_options & SO_TIMESTAMP) 372 ip6_savecontrol(in6p, m, &opts); 373 m_adj(m, off + sizeof(struct udphdr)); 374 if (sbappendaddr(&in6p->in6p_socket->so_rcv, 375 (struct sockaddr *)&fromsa, m, opts) == 0) { 376 udpstat.udps_fullsock++; 377 goto bad; 378 } 379 sorwakeup(in6p->in6p_socket); 380 return IPPROTO_DONE; 381 bad: 382 if (m) 383 m_freem(m); 384 if (opts) 385 m_freem(opts); 386 return IPPROTO_DONE; 387 } 388 389 void 390 udp6_ctlinput(cmd, sa, d) 391 int cmd; 392 struct sockaddr *sa; 393 void *d; 394 { 395 struct udphdr uh; 396 struct ip6_hdr *ip6; 397 struct mbuf *m; 398 int off = 0; 399 struct ip6ctlparam *ip6cp = NULL; 400 const struct sockaddr_in6 *sa6_src = NULL; 401 void *cmdarg; 402 struct inpcb *(*notify) __P((struct inpcb *, int)) = udp_notify; 403 struct udp_portonly { 404 u_int16_t uh_sport; 405 u_int16_t uh_dport; 406 } *uhp; 407 408 if (sa->sa_family != AF_INET6 || 409 sa->sa_len != sizeof(struct sockaddr_in6)) 410 return; 411 412 if ((unsigned)cmd >= PRC_NCMDS) 413 return; 414 if (PRC_IS_REDIRECT(cmd)) 415 notify = in6_rtchange, d = NULL; 416 else if (cmd == PRC_HOSTDEAD) 417 d = NULL; 418 else if (inet6ctlerrmap[cmd] == 0) 419 return; 420 421 /* if the parameter is from icmp6, decode it. */ 422 if (d != NULL) { 423 ip6cp = (struct ip6ctlparam *)d; 424 m = ip6cp->ip6c_m; 425 ip6 = ip6cp->ip6c_ip6; 426 off = ip6cp->ip6c_off; 427 cmdarg = ip6cp->ip6c_cmdarg; 428 sa6_src = ip6cp->ip6c_src; 429 } else { 430 m = NULL; 431 ip6 = NULL; 432 cmdarg = NULL; 433 sa6_src = &sa6_any; 434 } 435 436 if (ip6) { 437 /* 438 * XXX: We assume that when IPV6 is non NULL, 439 * M and OFF are valid. 440 */ 441 442 /* check if we can safely examine src and dst ports */ 443 if (m->m_pkthdr.len < off + sizeof(*uhp)) 444 return; 445 446 bzero(&uh, sizeof(uh)); 447 m_copydata(m, off, sizeof(*uhp), (caddr_t)&uh); 448 449 (void) in6_pcbnotify(&udb, sa, uh.uh_dport, 450 (struct sockaddr *)ip6cp->ip6c_src, 451 uh.uh_sport, cmd, cmdarg, notify); 452 } else 453 (void) in6_pcbnotify(&udb, sa, 0, 454 (const struct sockaddr *)sa6_src, 455 0, cmd, cmdarg, notify); 456 } 457 458 static int 459 udp6_getcred(SYSCTL_HANDLER_ARGS) 460 { 461 struct xucred xuc; 462 struct sockaddr_in6 addrs[2]; 463 struct inpcb *inp; 464 int error, s; 465 466 error = suser(req->td); 467 if (error) 468 return (error); 469 470 if (req->newlen != sizeof(addrs)) 471 return (EINVAL); 472 if (req->oldlen != sizeof(struct xucred)) 473 return (EINVAL); 474 error = SYSCTL_IN(req, addrs, sizeof(addrs)); 475 if (error) 476 return (error); 477 s = splnet(); 478 inp = in6_pcblookup_hash(&udbinfo, &addrs[1].sin6_addr, 479 addrs[1].sin6_port, 480 &addrs[0].sin6_addr, addrs[0].sin6_port, 481 1, NULL); 482 if (!inp || !inp->inp_socket) { 483 error = ENOENT; 484 goto out; 485 } 486 cru2x(inp->inp_socket->so_cred, &xuc); 487 error = SYSCTL_OUT(req, &xuc, sizeof(struct xucred)); 488 out: 489 splx(s); 490 return (error); 491 } 492 493 SYSCTL_PROC(_net_inet6_udp6, OID_AUTO, getcred, CTLTYPE_OPAQUE|CTLFLAG_RW, 494 0, 0, 495 udp6_getcred, "S,xucred", "Get the xucred of a UDP6 connection"); 496 497 static int 498 udp6_abort(struct socket *so) 499 { 500 struct inpcb *inp; 501 int s; 502 503 inp = sotoinpcb(so); 504 if (inp == 0) 505 return EINVAL; /* ??? possible? panic instead? */ 506 soisdisconnected(so); 507 s = splnet(); 508 in6_pcbdetach(inp); 509 splx(s); 510 return 0; 511 } 512 513 static int 514 udp6_attach(struct socket *so, int proto, struct thread *td) 515 { 516 struct inpcb *inp; 517 int s, error; 518 519 inp = sotoinpcb(so); 520 if (inp != 0) 521 return EINVAL; 522 523 if (so->so_snd.sb_hiwat == 0 || so->so_rcv.sb_hiwat == 0) { 524 error = soreserve(so, udp_sendspace, udp_recvspace); 525 if (error) 526 return error; 527 } 528 s = splnet(); 529 error = in_pcballoc(so, &udbinfo, td, "udp6inp"); 530 splx(s); 531 if (error) 532 return error; 533 inp = (struct inpcb *)so->so_pcb; 534 inp->inp_vflag |= INP_IPV6; 535 if (!ip6_v6only) 536 inp->inp_vflag |= INP_IPV4; 537 inp->in6p_hops = -1; /* use kernel default */ 538 inp->in6p_cksum = -1; /* just to be sure */ 539 /* 540 * XXX: ugly!! 541 * IPv4 TTL initialization is necessary for an IPv6 socket as well, 542 * because the socket may be bound to an IPv6 wildcard address, 543 * which may match an IPv4-mapped IPv6 address. 544 */ 545 inp->inp_ip_ttl = ip_defttl; 546 return 0; 547 } 548 549 static int 550 udp6_bind(struct socket *so, struct sockaddr *nam, struct thread *td) 551 { 552 struct inpcb *inp; 553 int s, error; 554 555 inp = sotoinpcb(so); 556 if (inp == 0) 557 return EINVAL; 558 559 inp->inp_vflag &= ~INP_IPV4; 560 inp->inp_vflag |= INP_IPV6; 561 if ((inp->inp_flags & IN6P_IPV6_V6ONLY) == 0) { 562 struct sockaddr_in6 *sin6_p; 563 564 sin6_p = (struct sockaddr_in6 *)nam; 565 566 if (IN6_IS_ADDR_UNSPECIFIED(&sin6_p->sin6_addr)) 567 inp->inp_vflag |= INP_IPV4; 568 else if (IN6_IS_ADDR_V4MAPPED(&sin6_p->sin6_addr)) { 569 struct sockaddr_in sin; 570 571 in6_sin6_2_sin(&sin, sin6_p); 572 inp->inp_vflag |= INP_IPV4; 573 inp->inp_vflag &= ~INP_IPV6; 574 s = splnet(); 575 error = in_pcbbind(inp, (struct sockaddr *)&sin, td); 576 splx(s); 577 return error; 578 } 579 } 580 581 s = splnet(); 582 error = in6_pcbbind(inp, nam, td); 583 splx(s); 584 return error; 585 } 586 587 static int 588 udp6_connect(struct socket *so, struct sockaddr *nam, struct thread *td) 589 { 590 struct inpcb *inp; 591 int s, error; 592 593 inp = sotoinpcb(so); 594 if (inp == 0) 595 return EINVAL; 596 597 if ((inp->inp_flags & IN6P_IPV6_V6ONLY) == 0) { 598 struct sockaddr_in6 *sin6_p; 599 600 sin6_p = (struct sockaddr_in6 *)nam; 601 if (IN6_IS_ADDR_V4MAPPED(&sin6_p->sin6_addr)) { 602 struct sockaddr_in sin; 603 604 if (inp->inp_faddr.s_addr != INADDR_ANY) 605 return EISCONN; 606 in6_sin6_2_sin(&sin, sin6_p); 607 s = splnet(); 608 error = in_pcbconnect(inp, (struct sockaddr *)&sin, td); 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); 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 } 632 633 static int 634 udp6_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 } 647 648 static int 649 udp6_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 } 677 678 static int 679 udp6_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 } 753 754 struct 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