udp6_usrreq.c revision 125777
1/* $FreeBSD: head/sys/netinet6/udp6_usrreq.c 125777 2004-02-13 15:11:47Z ume $ */ 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 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#ifdef IPSEC 243 /* 244 * Check AH/ESP integrity. 245 */ 246 if (ipsec6_in_reject(m, last)) 247 ipsec6stat.in_polvio++; 248 /* do not inject data into pcb */ 249 else 250#endif /* IPSEC */ 251#ifdef FAST_IPSEC 252 /* 253 * Check AH/ESP integrity. 254 */ 255 if (ipsec6_in_reject(m, last)) 256 ; 257 else 258#endif /* FAST_IPSEC */ 259 if ((n = m_copy(m, 0, M_COPYALL)) != NULL) { 260 /* 261 * KAME NOTE: do not 262 * m_copy(m, offset, ...) above. 263 * sbappendaddr() expects M_PKTHDR, 264 * and m_copy() will copy M_PKTHDR 265 * only if offset is 0. 266 */ 267 if (last->in6p_flags & IN6P_CONTROLOPTS 268 || last->in6p_socket->so_options & SO_TIMESTAMP) 269 ip6_savecontrol(last, n, &opts); 270 271 m_adj(n, off + sizeof(struct udphdr)); 272 if (sbappendaddr(&last->in6p_socket->so_rcv, 273 (struct sockaddr *)&fromsa, 274 n, opts) == 0) { 275 m_freem(n); 276 if (opts) 277 m_freem(opts); 278 udpstat.udps_fullsock++; 279 } else 280 sorwakeup(last->in6p_socket); 281 opts = NULL; 282 } 283 } 284 last = in6p; 285 /* 286 * Don't look for additional matches if this one does 287 * not have either the SO_REUSEPORT or SO_REUSEADDR 288 * socket options set. This heuristic avoids searching 289 * through all pcbs in the common case of a non-shared 290 * port. It assumes that an application will never 291 * clear these options after setting them. 292 */ 293 if ((last->in6p_socket->so_options & 294 (SO_REUSEPORT|SO_REUSEADDR)) == 0) 295 break; 296 } 297 298 if (last == NULL) { 299 /* 300 * No matching pcb found; discard datagram. 301 * (No need to send an ICMP Port Unreachable 302 * for a broadcast or multicast datgram.) 303 */ 304 udpstat.udps_noport++; 305 udpstat.udps_noportmcast++; 306 goto bad; 307 } 308#ifdef IPSEC 309 /* 310 * Check AH/ESP integrity. 311 */ 312 if (ipsec6_in_reject(m, last)) { 313 ipsec6stat.in_polvio++; 314 goto bad; 315 } 316#endif /* IPSEC */ 317#ifdef FAST_IPSEC 318 /* 319 * Check AH/ESP integrity. 320 */ 321 if (ipsec6_in_reject(m, last)) { 322 goto bad; 323 } 324#endif /* FAST_IPSEC */ 325 if (last->in6p_flags & IN6P_CONTROLOPTS 326 || last->in6p_socket->so_options & SO_TIMESTAMP) 327 ip6_savecontrol(last, m, &opts); 328 329 m_adj(m, off + sizeof(struct udphdr)); 330 if (sbappendaddr(&last->in6p_socket->so_rcv, 331 (struct sockaddr *)&fromsa, 332 m, opts) == 0) { 333 udpstat.udps_fullsock++; 334 goto bad; 335 } 336 sorwakeup(last->in6p_socket); 337 return IPPROTO_DONE; 338 } 339 /* 340 * Locate pcb for datagram. 341 */ 342 in6p = in6_pcblookup_hash(&udbinfo, &ip6->ip6_src, uh->uh_sport, 343 &ip6->ip6_dst, uh->uh_dport, 1, 344 m->m_pkthdr.rcvif); 345 if (in6p == 0) { 346 if (log_in_vain) { 347 char buf[INET6_ADDRSTRLEN]; 348 349 strcpy(buf, ip6_sprintf(&ip6->ip6_dst)); 350 log(LOG_INFO, 351 "Connection attempt to UDP [%s]:%d from [%s]:%d\n", 352 buf, ntohs(uh->uh_dport), 353 ip6_sprintf(&ip6->ip6_src), ntohs(uh->uh_sport)); 354 } 355 udpstat.udps_noport++; 356 if (m->m_flags & M_MCAST) { 357 printf("UDP6: M_MCAST is set in a unicast packet.\n"); 358 udpstat.udps_noportmcast++; 359 goto bad; 360 } 361 icmp6_error(m, ICMP6_DST_UNREACH, ICMP6_DST_UNREACH_NOPORT, 0); 362 return IPPROTO_DONE; 363 } 364#ifdef IPSEC 365 /* 366 * Check AH/ESP integrity. 367 */ 368 if (ipsec6_in_reject(m, in6p)) { 369 ipsec6stat.in_polvio++; 370 goto bad; 371 } 372#endif /* IPSEC */ 373#ifdef FAST_IPSEC 374 /* 375 * Check AH/ESP integrity. 376 */ 377 if (ipsec6_in_reject(m, in6p)) { 378 goto bad; 379 } 380#endif /* FAST_IPSEC */ 381 382 /* 383 * Construct sockaddr format source address. 384 * Stuff source address and datagram in user buffer. 385 */ 386 init_sin6(&fromsa, m); 387 fromsa.sin6_port = uh->uh_sport; 388 if (in6p->in6p_flags & IN6P_CONTROLOPTS 389 || in6p->in6p_socket->so_options & SO_TIMESTAMP) 390 ip6_savecontrol(in6p, m, &opts); 391 m_adj(m, off + sizeof(struct udphdr)); 392 if (sbappendaddr(&in6p->in6p_socket->so_rcv, 393 (struct sockaddr *)&fromsa, m, opts) == 0) { 394 udpstat.udps_fullsock++; 395 goto bad; 396 } 397 sorwakeup(in6p->in6p_socket); 398 return IPPROTO_DONE; 399bad: 400 if (m) 401 m_freem(m); 402 if (opts) 403 m_freem(opts); 404 return IPPROTO_DONE; 405} 406 407void 408udp6_ctlinput(cmd, sa, d) 409 int cmd; 410 struct sockaddr *sa; 411 void *d; 412{ 413 struct udphdr uh; 414 struct ip6_hdr *ip6; 415 struct mbuf *m; 416 int off = 0; 417 struct ip6ctlparam *ip6cp = NULL; 418 const struct sockaddr_in6 *sa6_src = NULL; 419 void *cmdarg; 420 struct inpcb *(*notify) __P((struct inpcb *, int)) = udp_notify; 421 struct udp_portonly { 422 u_int16_t uh_sport; 423 u_int16_t uh_dport; 424 } *uhp; 425 426 if (sa->sa_family != AF_INET6 || 427 sa->sa_len != sizeof(struct sockaddr_in6)) 428 return; 429 430 if ((unsigned)cmd >= PRC_NCMDS) 431 return; 432 if (PRC_IS_REDIRECT(cmd)) 433 notify = in6_rtchange, d = NULL; 434 else if (cmd == PRC_HOSTDEAD) 435 d = NULL; 436 else if (inet6ctlerrmap[cmd] == 0) 437 return; 438 439 /* if the parameter is from icmp6, decode it. */ 440 if (d != NULL) { 441 ip6cp = (struct ip6ctlparam *)d; 442 m = ip6cp->ip6c_m; 443 ip6 = ip6cp->ip6c_ip6; 444 off = ip6cp->ip6c_off; 445 cmdarg = ip6cp->ip6c_cmdarg; 446 sa6_src = ip6cp->ip6c_src; 447 } else { 448 m = NULL; 449 ip6 = NULL; 450 cmdarg = NULL; 451 sa6_src = &sa6_any; 452 } 453 454 if (ip6) { 455 /* 456 * XXX: We assume that when IPV6 is non NULL, 457 * M and OFF are valid. 458 */ 459 460 /* check if we can safely examine src and dst ports */ 461 if (m->m_pkthdr.len < off + sizeof(*uhp)) 462 return; 463 464 bzero(&uh, sizeof(uh)); 465 m_copydata(m, off, sizeof(*uhp), (caddr_t)&uh); 466 467 (void) in6_pcbnotify(&udb, sa, uh.uh_dport, 468 (struct sockaddr *)ip6cp->ip6c_src, 469 uh.uh_sport, cmd, cmdarg, notify); 470 } else 471 (void) in6_pcbnotify(&udb, sa, 0, 472 (const struct sockaddr *)sa6_src, 473 0, cmd, cmdarg, notify); 474} 475 476static int 477udp6_getcred(SYSCTL_HANDLER_ARGS) 478{ 479 struct xucred xuc; 480 struct sockaddr_in6 addrs[2]; 481 struct inpcb *inp; 482 int error, s; 483 484 error = suser(req->td); 485 if (error) 486 return (error); 487 488 if (req->newlen != sizeof(addrs)) 489 return (EINVAL); 490 if (req->oldlen != sizeof(struct xucred)) 491 return (EINVAL); 492 error = SYSCTL_IN(req, addrs, sizeof(addrs)); 493 if (error) 494 return (error); 495 s = splnet(); 496 inp = in6_pcblookup_hash(&udbinfo, &addrs[1].sin6_addr, 497 addrs[1].sin6_port, 498 &addrs[0].sin6_addr, addrs[0].sin6_port, 499 1, NULL); 500 if (!inp || !inp->inp_socket) { 501 error = ENOENT; 502 goto out; 503 } 504 cru2x(inp->inp_socket->so_cred, &xuc); 505 error = SYSCTL_OUT(req, &xuc, sizeof(struct xucred)); 506out: 507 splx(s); 508 return (error); 509} 510 511SYSCTL_PROC(_net_inet6_udp6, OID_AUTO, getcred, CTLTYPE_OPAQUE|CTLFLAG_RW, 512 0, 0, 513 udp6_getcred, "S,xucred", "Get the xucred of a UDP6 connection"); 514 515static int 516udp6_abort(struct socket *so) 517{ 518 struct inpcb *inp; 519 int s; 520 521 inp = sotoinpcb(so); 522 if (inp == 0) 523 return EINVAL; /* ??? possible? panic instead? */ 524 soisdisconnected(so); 525 s = splnet(); 526 in6_pcbdetach(inp); 527 splx(s); 528 return 0; 529} 530 531static int 532udp6_attach(struct socket *so, int proto, struct thread *td) 533{ 534 struct inpcb *inp; 535 int s, error; 536 537 inp = sotoinpcb(so); 538 if (inp != 0) 539 return EINVAL; 540 541 if (so->so_snd.sb_hiwat == 0 || so->so_rcv.sb_hiwat == 0) { 542 error = soreserve(so, udp_sendspace, udp_recvspace); 543 if (error) 544 return error; 545 } 546 s = splnet(); 547 error = in_pcballoc(so, &udbinfo, td, "udp6inp"); 548 splx(s); 549 if (error) 550 return error; 551 inp = (struct inpcb *)so->so_pcb; 552 inp->inp_vflag |= INP_IPV6; 553 if (!ip6_v6only) 554 inp->inp_vflag |= INP_IPV4; 555 inp->in6p_hops = -1; /* use kernel default */ 556 inp->in6p_cksum = -1; /* just to be sure */ 557 /* 558 * XXX: ugly!! 559 * IPv4 TTL initialization is necessary for an IPv6 socket as well, 560 * because the socket may be bound to an IPv6 wildcard address, 561 * which may match an IPv4-mapped IPv6 address. 562 */ 563 inp->inp_ip_ttl = ip_defttl; 564 return 0; 565} 566 567static int 568udp6_bind(struct socket *so, struct sockaddr *nam, struct thread *td) 569{ 570 struct inpcb *inp; 571 int s, error; 572 573 inp = sotoinpcb(so); 574 if (inp == 0) 575 return EINVAL; 576 577 inp->inp_vflag &= ~INP_IPV4; 578 inp->inp_vflag |= INP_IPV6; 579 if ((inp->inp_flags & IN6P_IPV6_V6ONLY) == 0) { 580 struct sockaddr_in6 *sin6_p; 581 582 sin6_p = (struct sockaddr_in6 *)nam; 583 584 if (IN6_IS_ADDR_UNSPECIFIED(&sin6_p->sin6_addr)) 585 inp->inp_vflag |= INP_IPV4; 586 else if (IN6_IS_ADDR_V4MAPPED(&sin6_p->sin6_addr)) { 587 struct sockaddr_in sin; 588 589 in6_sin6_2_sin(&sin, sin6_p); 590 inp->inp_vflag |= INP_IPV4; 591 inp->inp_vflag &= ~INP_IPV6; 592 s = splnet(); 593 error = in_pcbbind(inp, (struct sockaddr *)&sin, td); 594 splx(s); 595 return error; 596 } 597 } 598 599 s = splnet(); 600 error = in6_pcbbind(inp, nam, td); 601 splx(s); 602 return error; 603} 604 605static int 606udp6_connect(struct socket *so, struct sockaddr *nam, struct thread *td) 607{ 608 struct inpcb *inp; 609 int s, error; 610 611 inp = sotoinpcb(so); 612 if (inp == 0) 613 return EINVAL; 614 615 if ((inp->inp_flags & IN6P_IPV6_V6ONLY) == 0) { 616 struct sockaddr_in6 *sin6_p; 617 618 sin6_p = (struct sockaddr_in6 *)nam; 619 if (IN6_IS_ADDR_V4MAPPED(&sin6_p->sin6_addr)) { 620 struct sockaddr_in sin; 621 622 if (inp->inp_faddr.s_addr != INADDR_ANY) 623 return EISCONN; 624 in6_sin6_2_sin(&sin, sin6_p); 625 s = splnet(); 626 error = in_pcbconnect(inp, (struct sockaddr *)&sin, td); 627 splx(s); 628 if (error == 0) { 629 inp->inp_vflag |= INP_IPV4; 630 inp->inp_vflag &= ~INP_IPV6; 631 soisconnected(so); 632 } 633 return error; 634 } 635 } 636 if (!IN6_IS_ADDR_UNSPECIFIED(&inp->in6p_faddr)) 637 return EISCONN; 638 s = splnet(); 639 error = in6_pcbconnect(inp, nam, td); 640 splx(s); 641 if (error == 0) { 642 if (!ip6_v6only) { /* should be non mapped addr */ 643 inp->inp_vflag &= ~INP_IPV4; 644 inp->inp_vflag |= INP_IPV6; 645 } 646 soisconnected(so); 647 } 648 return error; 649} 650 651static int 652udp6_detach(struct socket *so) 653{ 654 struct inpcb *inp; 655 int s; 656 657 inp = sotoinpcb(so); 658 if (inp == 0) 659 return EINVAL; 660 s = splnet(); 661 in6_pcbdetach(inp); 662 splx(s); 663 return 0; 664} 665 666static int 667udp6_disconnect(struct socket *so) 668{ 669 struct inpcb *inp; 670 int s; 671 672 inp = sotoinpcb(so); 673 if (inp == 0) 674 return EINVAL; 675 676#ifdef INET 677 if (inp->inp_vflag & INP_IPV4) { 678 struct pr_usrreqs *pru; 679 680 pru = inetsw[ip_protox[IPPROTO_UDP]].pr_usrreqs; 681 return ((*pru->pru_disconnect)(so)); 682 } 683#endif 684 685 if (IN6_IS_ADDR_UNSPECIFIED(&inp->in6p_faddr)) 686 return ENOTCONN; 687 688 s = splnet(); 689 in6_pcbdisconnect(inp); 690 inp->in6p_laddr = in6addr_any; 691 splx(s); 692 so->so_state &= ~SS_ISCONNECTED; /* XXX */ 693 return 0; 694} 695 696static int 697udp6_send(struct socket *so, int flags, struct mbuf *m, struct sockaddr *addr, 698 struct mbuf *control, struct thread *td) 699{ 700 struct inpcb *inp; 701 int error = 0; 702 703 inp = sotoinpcb(so); 704 if (inp == 0) { 705 error = EINVAL; 706 goto bad; 707 } 708 709 if (addr) { 710 if (addr->sa_len != sizeof(struct sockaddr_in6)) { 711 error = EINVAL; 712 goto bad; 713 } 714 if (addr->sa_family != AF_INET6) { 715 error = EAFNOSUPPORT; 716 goto bad; 717 } 718 } 719 720#ifdef INET 721 if (!ip6_v6only) { 722 int hasv4addr; 723 struct sockaddr_in6 *sin6 = 0; 724 725 if (addr == 0) 726 hasv4addr = (inp->inp_vflag & INP_IPV4); 727 else { 728 sin6 = (struct sockaddr_in6 *)addr; 729 hasv4addr = IN6_IS_ADDR_V4MAPPED(&sin6->sin6_addr) 730 ? 1 : 0; 731 } 732 if (hasv4addr) { 733 struct pr_usrreqs *pru; 734 735 if ((inp->inp_flags & IN6P_IPV6_V6ONLY)) { 736 /* 737 * since a user of this socket set the 738 * IPV6_V6ONLY flag, we discard this 739 * datagram destined to a v4 addr. 740 */ 741 return EINVAL; 742 } 743 if (!IN6_IS_ADDR_UNSPECIFIED(&inp->in6p_laddr) && 744 !IN6_IS_ADDR_V4MAPPED(&inp->in6p_laddr)) { 745 /* 746 * when remote addr is IPv4-mapped 747 * address, local addr should not be 748 * an IPv6 address; since you cannot 749 * determine how to map IPv6 source 750 * address to IPv4. 751 */ 752 return EINVAL; 753 } 754 if (sin6) 755 in6_sin6_2_sin_in_sock(addr); 756 pru = inetsw[ip_protox[IPPROTO_UDP]].pr_usrreqs; 757 error = ((*pru->pru_send)(so, flags, m, addr, control, 758 td)); 759 /* addr will just be freed in sendit(). */ 760 return error; 761 } 762 } 763#endif 764 765 return udp6_output(inp, m, addr, control, td); 766 767 bad: 768 m_freem(m); 769 return (error); 770} 771 772struct pr_usrreqs udp6_usrreqs = { 773 udp6_abort, pru_accept_notsupp, udp6_attach, udp6_bind, udp6_connect, 774 pru_connect2_notsupp, in6_control, udp6_detach, udp6_disconnect, 775 pru_listen_notsupp, in6_mapped_peeraddr, pru_rcvd_notsupp, 776 pru_rcvoob_notsupp, udp6_send, pru_sense_null, udp_shutdown, 777 in6_mapped_sockaddr, sosend, soreceive, sopoll, in_pcbsosetlabel 778}; 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