1 /* $FreeBSD: src/sys/netinet6/udp6_usrreq.c,v 1.6.2.13 2003/01/24 05:11:35 sam Exp $ */ 2 /* $DragonFly: src/sys/netinet6/udp6_usrreq.c,v 1.20 2005/06/03 19:56:08 eirikn Exp $ */ 3 /* $KAME: udp6_usrreq.c,v 1.27 2001/05/21 05:45:10 jinmei Exp $ */ 4 5 /* 6 * Copyright (C) 1995, 1996, 1997, and 1998 WIDE Project. 7 * All rights reserved. 8 * 9 * Redistribution and use in source and binary forms, with or without 10 * modification, are permitted provided that the following conditions 11 * are met: 12 * 1. Redistributions of source code must retain the above copyright 13 * notice, this list of conditions and the following disclaimer. 14 * 2. Redistributions in binary form must reproduce the above copyright 15 * notice, this list of conditions and the following disclaimer in the 16 * documentation and/or other materials provided with the distribution. 17 * 3. Neither the name of the project nor the names of its contributors 18 * may be used to endorse or promote products derived from this software 19 * without specific prior written permission. 20 * 21 * THIS SOFTWARE IS PROVIDED BY THE PROJECT AND CONTRIBUTORS ``AS IS'' AND 22 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 23 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 24 * ARE DISCLAIMED. IN NO EVENT SHALL THE PROJECT OR CONTRIBUTORS BE LIABLE 25 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 26 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 27 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 28 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 29 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 30 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 31 * SUCH DAMAGE. 32 */ 33 34 /* 35 * Copyright (c) 1982, 1986, 1989, 1993 36 * The Regents of the University of California. All rights reserved. 37 * 38 * Redistribution and use in source and binary forms, with or without 39 * modification, are permitted provided that the following conditions 40 * are met: 41 * 1. Redistributions of source code must retain the above copyright 42 * notice, this list of conditions and the following disclaimer. 43 * 2. Redistributions in binary form must reproduce the above copyright 44 * notice, this list of conditions and the following disclaimer in the 45 * documentation and/or other materials provided with the distribution. 46 * 3. All advertising materials mentioning features or use of this software 47 * must display the following acknowledgement: 48 * This product includes software developed by the University of 49 * California, Berkeley and its contributors. 50 * 4. Neither the name of the University nor the names of its contributors 51 * may be used to endorse or promote products derived from this software 52 * without specific prior written permission. 53 * 54 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND 55 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 56 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 57 * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE 58 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 59 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 60 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 61 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 62 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 63 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 64 * SUCH DAMAGE. 65 * 66 * @(#)udp_var.h 8.1 (Berkeley) 6/10/93 67 */ 68 69 #include "opt_inet.h" 70 #include "opt_inet6.h" 71 #include "opt_ipsec.h" 72 73 #include <sys/param.h> 74 #include <sys/kernel.h> 75 #include <sys/mbuf.h> 76 #include <sys/protosw.h> 77 #include <sys/socket.h> 78 #include <sys/socketvar.h> 79 #include <sys/sysctl.h> 80 #include <sys/errno.h> 81 #include <sys/stat.h> 82 #include <sys/systm.h> 83 #include <sys/syslog.h> 84 #include <sys/proc.h> 85 #include <sys/thread2.h> 86 87 #include <net/if.h> 88 #include <net/route.h> 89 #include <net/if_types.h> 90 91 #include <netinet/in.h> 92 #include <netinet/in_systm.h> 93 #include <netinet/ip.h> 94 #include <netinet/in_pcb.h> 95 #include <netinet/in_var.h> 96 #include <netinet/ip_var.h> 97 #include <netinet/udp.h> 98 #include <netinet/udp_var.h> 99 #include <netinet/ip6.h> 100 #include <netinet6/ip6_var.h> 101 #include <netinet6/in6_pcb.h> 102 #include <netinet/icmp6.h> 103 #include <netinet6/udp6_var.h> 104 #include <netinet6/ip6protosw.h> 105 106 #ifdef IPSEC 107 #include <netinet6/ipsec.h> 108 #include <netinet6/ipsec6.h> 109 #endif /* IPSEC */ 110 111 #ifdef FAST_IPSEC 112 #include <netproto/ipsec/ipsec.h> 113 #include <netproto/ipsec/ipsec6.h> 114 #endif /* FAST_IPSEC */ 115 116 /* 117 * UDP protocol inplementation. 118 * Per RFC 768, August, 1980. 119 */ 120 121 extern struct protosw inetsw[]; 122 static int in6_mcmatch (struct inpcb *, struct in6_addr *, struct ifnet *); 123 static int udp6_detach (struct socket *so); 124 125 static int 126 in6_mcmatch(struct inpcb *in6p, struct in6_addr *ia6, struct ifnet *ifp) 127 { 128 struct ip6_moptions *im6o = in6p->in6p_moptions; 129 struct in6_multi_mship *imm; 130 131 if (im6o == NULL) 132 return 0; 133 134 for (imm = im6o->im6o_memberships.lh_first; imm != NULL; 135 imm = imm->i6mm_chain.le_next) { 136 if ((ifp == NULL || 137 imm->i6mm_maddr->in6m_ifp == ifp) && 138 IN6_ARE_ADDR_EQUAL(&imm->i6mm_maddr->in6m_addr, 139 ia6)) 140 return 1; 141 } 142 return 0; 143 } 144 145 int 146 udp6_input(struct mbuf **mp, int *offp, int proto) 147 { 148 struct mbuf *m = *mp; 149 struct ip6_hdr *ip6; 150 struct udphdr *uh; 151 struct inpcb *in6p; 152 struct mbuf *opts = NULL; 153 int off = *offp; 154 int plen, ulen; 155 struct sockaddr_in6 udp_in6; 156 157 IP6_EXTHDR_CHECK(m, off, sizeof(struct udphdr), IPPROTO_DONE); 158 159 ip6 = mtod(m, struct ip6_hdr *); 160 161 if (faithprefix_p != NULL && (*faithprefix_p)(&ip6->ip6_dst)) { 162 /* XXX send icmp6 host/port unreach? */ 163 m_freem(m); 164 return IPPROTO_DONE; 165 } 166 167 udpstat.udps_ipackets++; 168 169 plen = ntohs(ip6->ip6_plen) - off + sizeof(*ip6); 170 uh = (struct udphdr *)((caddr_t)ip6 + off); 171 ulen = ntohs((u_short)uh->uh_ulen); 172 173 if (plen != ulen) { 174 udpstat.udps_badlen++; 175 goto bad; 176 } 177 178 /* 179 * Checksum extended UDP header and data. 180 */ 181 if (uh->uh_sum == 0) 182 udpstat.udps_nosum++; 183 else if (in6_cksum(m, IPPROTO_UDP, off, ulen) != 0) { 184 udpstat.udps_badsum++; 185 goto bad; 186 } 187 188 if (IN6_IS_ADDR_MULTICAST(&ip6->ip6_dst)) { 189 struct inpcb *last; 190 191 /* 192 * Deliver a multicast datagram to all sockets 193 * for which the local and remote addresses and ports match 194 * those of the incoming datagram. This allows more than 195 * one process to receive multicasts on the same port. 196 * (This really ought to be done for unicast datagrams as 197 * well, but that would cause problems with existing 198 * applications that open both address-specific sockets and 199 * a wildcard socket listening to the same port -- they would 200 * end up receiving duplicates of every unicast datagram. 201 * Those applications open the multiple sockets to overcome an 202 * inadequacy of the UDP socket interface, but for backwards 203 * compatibility we avoid the problem here rather than 204 * fixing the interface. Maybe 4.5BSD will remedy this?) 205 */ 206 207 /* 208 * In a case that laddr should be set to the link-local 209 * address (this happens in RIPng), the multicast address 210 * specified in the received packet does not match with 211 * laddr. To cure this situation, the matching is relaxed 212 * if the receiving interface is the same as one specified 213 * in the socket and if the destination multicast address 214 * matches one of the multicast groups specified in the socket. 215 */ 216 217 /* 218 * Construct sockaddr format source address. 219 */ 220 init_sin6(&udp_in6, m); /* general init */ 221 udp_in6.sin6_port = uh->uh_sport; 222 /* 223 * KAME note: traditionally we dropped udpiphdr from mbuf here. 224 * We need udphdr for IPsec processing so we do that later. 225 */ 226 227 /* 228 * Locate pcb(s) for datagram. 229 * (Algorithm copied from raw_intr().) 230 */ 231 last = NULL; 232 LIST_FOREACH(in6p, &udbinfo.pcblisthead, inp_list) { 233 if ((in6p->inp_flags & INP_PLACEMARKER) == 0) 234 continue; 235 if ((in6p->inp_vflag & INP_IPV6) == 0) 236 continue; 237 if (in6p->in6p_lport != uh->uh_dport) 238 continue; 239 if (!IN6_IS_ADDR_UNSPECIFIED(&in6p->in6p_laddr)) { 240 if (!IN6_ARE_ADDR_EQUAL(&in6p->in6p_laddr, 241 &ip6->ip6_dst) && 242 !in6_mcmatch(in6p, &ip6->ip6_dst, 243 m->m_pkthdr.rcvif)) 244 continue; 245 } 246 if (!IN6_IS_ADDR_UNSPECIFIED(&in6p->in6p_faddr)) { 247 if (!IN6_ARE_ADDR_EQUAL(&in6p->in6p_faddr, 248 &ip6->ip6_src) || 249 in6p->in6p_fport != uh->uh_sport) 250 continue; 251 } 252 253 if (last != NULL) { 254 struct mbuf *n; 255 256 #ifdef IPSEC 257 /* 258 * Check AH/ESP integrity. 259 */ 260 if (ipsec6_in_reject_so(m, last->inp_socket)) 261 ipsec6stat.in_polvio++; 262 /* do not inject data into pcb */ 263 else 264 #endif /* IPSEC */ 265 #ifdef FAST_IPSEC 266 /* 267 * Check AH/ESP integrity. 268 */ 269 if (ipsec6_in_reject(m, last)) 270 ; 271 else 272 #endif /* FAST_IPSEC */ 273 if ((n = m_copy(m, 0, M_COPYALL)) != NULL) { 274 /* 275 * KAME NOTE: do not 276 * m_copy(m, offset, ...) above. 277 * sbappendaddr() expects M_PKTHDR, 278 * and m_copy() will copy M_PKTHDR 279 * only if offset is 0. 280 */ 281 if (last->in6p_flags & IN6P_CONTROLOPTS 282 || last->in6p_socket->so_options & SO_TIMESTAMP) 283 ip6_savecontrol(last, &opts, 284 ip6, n); 285 286 m_adj(n, off + sizeof(struct udphdr)); 287 if (sbappendaddr(&last->in6p_socket->so_rcv, 288 (struct sockaddr *)&udp_in6, 289 n, opts) == 0) { 290 m_freem(n); 291 if (opts) 292 m_freem(opts); 293 udpstat.udps_fullsock++; 294 } else 295 sorwakeup(last->in6p_socket); 296 opts = NULL; 297 } 298 } 299 last = in6p; 300 /* 301 * Don't look for additional matches if this one does 302 * not have either the SO_REUSEPORT or SO_REUSEADDR 303 * socket options set. This heuristic avoids searching 304 * through all pcbs in the common case of a non-shared 305 * port. It assumes that an application will never 306 * clear these options after setting them. 307 */ 308 if ((last->in6p_socket->so_options & 309 (SO_REUSEPORT|SO_REUSEADDR)) == 0) 310 break; 311 } 312 313 if (last == NULL) { 314 /* 315 * No matching pcb found; discard datagram. 316 * (No need to send an ICMP Port Unreachable 317 * for a broadcast or multicast datgram.) 318 */ 319 udpstat.udps_noport++; 320 udpstat.udps_noportmcast++; 321 goto bad; 322 } 323 #ifdef IPSEC 324 /* 325 * Check AH/ESP integrity. 326 */ 327 if (ipsec6_in_reject_so(m, last->inp_socket)) { 328 ipsec6stat.in_polvio++; 329 goto bad; 330 } 331 #endif /* IPSEC */ 332 #ifdef FAST_IPSEC 333 /* 334 * Check AH/ESP integrity. 335 */ 336 if (ipsec6_in_reject(m, last)) { 337 goto bad; 338 } 339 #endif /* FAST_IPSEC */ 340 if (last->in6p_flags & IN6P_CONTROLOPTS 341 || last->in6p_socket->so_options & SO_TIMESTAMP) 342 ip6_savecontrol(last, &opts, ip6, m); 343 344 m_adj(m, off + sizeof(struct udphdr)); 345 if (sbappendaddr(&last->in6p_socket->so_rcv, 346 (struct sockaddr *)&udp_in6, 347 m, opts) == 0) { 348 udpstat.udps_fullsock++; 349 goto bad; 350 } 351 sorwakeup(last->in6p_socket); 352 return IPPROTO_DONE; 353 } 354 /* 355 * Locate pcb for datagram. 356 */ 357 in6p = in6_pcblookup_hash(&udbinfo, &ip6->ip6_src, uh->uh_sport, 358 &ip6->ip6_dst, uh->uh_dport, 1, 359 m->m_pkthdr.rcvif); 360 if (in6p == 0) { 361 if (log_in_vain) { 362 char buf[INET6_ADDRSTRLEN]; 363 364 strcpy(buf, ip6_sprintf(&ip6->ip6_dst)); 365 log(LOG_INFO, 366 "Connection attempt to UDP [%s]:%d from [%s]:%d\n", 367 buf, ntohs(uh->uh_dport), 368 ip6_sprintf(&ip6->ip6_src), ntohs(uh->uh_sport)); 369 } 370 udpstat.udps_noport++; 371 if (m->m_flags & M_MCAST) { 372 printf("UDP6: M_MCAST is set in a unicast packet.\n"); 373 udpstat.udps_noportmcast++; 374 goto bad; 375 } 376 icmp6_error(m, ICMP6_DST_UNREACH, ICMP6_DST_UNREACH_NOPORT, 0); 377 return IPPROTO_DONE; 378 } 379 #ifdef IPSEC 380 /* 381 * Check AH/ESP integrity. 382 */ 383 if (ipsec6_in_reject_so(m, in6p->in6p_socket)) { 384 ipsec6stat.in_polvio++; 385 goto bad; 386 } 387 #endif /* IPSEC */ 388 #ifdef FAST_IPSEC 389 /* 390 * Check AH/ESP integrity. 391 */ 392 if (ipsec6_in_reject(m, in6p)) { 393 goto bad; 394 } 395 #endif /* FAST_IPSEC */ 396 397 /* 398 * Construct sockaddr format source address. 399 * Stuff source address and datagram in user buffer. 400 */ 401 init_sin6(&udp_in6, m); /* general init */ 402 udp_in6.sin6_port = uh->uh_sport; 403 if (in6p->in6p_flags & IN6P_CONTROLOPTS 404 || in6p->in6p_socket->so_options & SO_TIMESTAMP) 405 ip6_savecontrol(in6p, &opts, ip6, m); 406 m_adj(m, off + sizeof(struct udphdr)); 407 if (sbappendaddr(&in6p->in6p_socket->so_rcv, 408 (struct sockaddr *)&udp_in6, 409 m, opts) == 0) { 410 udpstat.udps_fullsock++; 411 goto bad; 412 } 413 sorwakeup(in6p->in6p_socket); 414 return IPPROTO_DONE; 415 bad: 416 if (m) 417 m_freem(m); 418 if (opts) 419 m_freem(opts); 420 return IPPROTO_DONE; 421 } 422 423 void 424 udp6_ctlinput(int cmd, struct sockaddr *sa, void *d) 425 { 426 struct udphdr uh; 427 struct ip6_hdr *ip6; 428 struct mbuf *m; 429 int off = 0; 430 struct ip6ctlparam *ip6cp = NULL; 431 const struct sockaddr_in6 *sa6_src = NULL; 432 void (*notify) (struct inpcb *, int) = udp_notify; 433 struct udp_portonly { 434 u_int16_t uh_sport; 435 u_int16_t uh_dport; 436 } *uhp; 437 438 if (sa->sa_family != AF_INET6 || 439 sa->sa_len != sizeof(struct sockaddr_in6)) 440 return; 441 442 if ((unsigned)cmd >= PRC_NCMDS) 443 return; 444 if (PRC_IS_REDIRECT(cmd)) 445 notify = in6_rtchange, d = NULL; 446 else if (cmd == PRC_HOSTDEAD) 447 d = NULL; 448 else if (inet6ctlerrmap[cmd] == 0) 449 return; 450 451 /* if the parameter is from icmp6, decode it. */ 452 if (d != NULL) { 453 ip6cp = (struct ip6ctlparam *)d; 454 m = ip6cp->ip6c_m; 455 ip6 = ip6cp->ip6c_ip6; 456 off = ip6cp->ip6c_off; 457 sa6_src = ip6cp->ip6c_src; 458 } else { 459 m = NULL; 460 ip6 = NULL; 461 sa6_src = &sa6_any; 462 } 463 464 if (ip6) { 465 /* 466 * XXX: We assume that when IPV6 is non NULL, 467 * M and OFF are valid. 468 */ 469 470 /* check if we can safely examine src and dst ports */ 471 if (m->m_pkthdr.len < off + sizeof(*uhp)) 472 return; 473 474 bzero(&uh, sizeof(uh)); 475 m_copydata(m, off, sizeof(*uhp), (caddr_t)&uh); 476 477 in6_pcbnotify(&udbinfo.pcblisthead, sa, uh.uh_dport, 478 (struct sockaddr *)ip6cp->ip6c_src, uh.uh_sport, 479 cmd, 0, notify); 480 } else 481 in6_pcbnotify(&udbinfo.pcblisthead, sa, 0, 482 (const struct sockaddr *)sa6_src, 0, 483 cmd, 0, notify); 484 } 485 486 static int 487 udp6_getcred(SYSCTL_HANDLER_ARGS) 488 { 489 struct sockaddr_in6 addrs[2]; 490 struct inpcb *inp; 491 int error; 492 493 error = suser(req->td); 494 if (error) 495 return (error); 496 497 if (req->newlen != sizeof(addrs)) 498 return (EINVAL); 499 if (req->oldlen != sizeof(struct ucred)) 500 return (EINVAL); 501 error = SYSCTL_IN(req, addrs, sizeof(addrs)); 502 if (error) 503 return (error); 504 crit_enter(); 505 inp = in6_pcblookup_hash(&udbinfo, &addrs[1].sin6_addr, 506 addrs[1].sin6_port, 507 &addrs[0].sin6_addr, addrs[0].sin6_port, 508 1, NULL); 509 if (!inp || !inp->inp_socket) { 510 error = ENOENT; 511 goto out; 512 } 513 error = SYSCTL_OUT(req, inp->inp_socket->so_cred, 514 sizeof(struct ucred)); 515 516 out: 517 crit_exit(); 518 return (error); 519 } 520 521 SYSCTL_PROC(_net_inet6_udp6, OID_AUTO, getcred, CTLTYPE_OPAQUE|CTLFLAG_RW, 522 0, 0, 523 udp6_getcred, "S,ucred", "Get the ucred of a UDP6 connection"); 524 525 static int 526 udp6_abort(struct socket *so) 527 { 528 struct inpcb *inp; 529 530 inp = so->so_pcb; 531 if (inp == 0) 532 return EINVAL; /* ??? possible? panic instead? */ 533 soisdisconnected(so); 534 crit_enter(); 535 in6_pcbdetach(inp); 536 crit_exit(); 537 return 0; 538 } 539 540 static int 541 udp6_attach(struct socket *so, int proto, struct pru_attach_info *ai) 542 { 543 struct inpcb *inp; 544 int error; 545 546 inp = so->so_pcb; 547 if (inp != 0) 548 return EINVAL; 549 550 if (so->so_snd.sb_hiwat == 0 || so->so_rcv.sb_hiwat == 0) { 551 error = soreserve(so, udp_sendspace, udp_recvspace, 552 ai->sb_rlimit); 553 if (error) 554 return error; 555 } 556 crit_enter(); 557 error = in_pcballoc(so, &udbinfo); 558 crit_exit(); 559 if (error) 560 return error; 561 inp = (struct inpcb *)so->so_pcb; 562 inp->inp_vflag |= INP_IPV6; 563 if (!ip6_v6only) 564 inp->inp_vflag |= INP_IPV4; 565 inp->in6p_hops = -1; /* use kernel default */ 566 inp->in6p_cksum = -1; /* just to be sure */ 567 /* 568 * XXX: ugly!! 569 * IPv4 TTL initialization is necessary for an IPv6 socket as well, 570 * because the socket may be bound to an IPv6 wildcard address, 571 * which may match an IPv4-mapped IPv6 address. 572 */ 573 inp->inp_ip_ttl = ip_defttl; 574 return 0; 575 } 576 577 static int 578 udp6_bind(struct socket *so, struct sockaddr *nam, struct thread *td) 579 { 580 struct sockaddr_in6 *sin6_p = (struct sockaddr_in6 *)nam; 581 struct inpcb *inp; 582 int error; 583 584 inp = so->so_pcb; 585 if (inp == 0) 586 return EINVAL; 587 588 inp->inp_vflag &= ~INP_IPV4; 589 inp->inp_vflag |= INP_IPV6; 590 if ((inp->inp_flags & IN6P_IPV6_V6ONLY) == 0) { 591 if (IN6_IS_ADDR_UNSPECIFIED(&sin6_p->sin6_addr)) 592 inp->inp_vflag |= INP_IPV4; 593 else if (IN6_IS_ADDR_V4MAPPED(&sin6_p->sin6_addr)) { 594 struct sockaddr_in sin; 595 596 in6_sin6_2_sin(&sin, sin6_p); 597 inp->inp_vflag |= INP_IPV4; 598 inp->inp_vflag &= ~INP_IPV6; 599 crit_enter(); 600 error = in_pcbbind(inp, (struct sockaddr *)&sin, td); 601 crit_exit(); 602 return error; 603 } 604 } 605 606 crit_enter(); 607 error = in6_pcbbind(inp, nam, td); 608 crit_exit(); 609 if (error == 0) { 610 if (IN6_IS_ADDR_UNSPECIFIED(&sin6_p->sin6_addr)) 611 inp->inp_flags |= INP_WASBOUND_NOTANY; 612 in_pcbinswildcardhash(inp); 613 } 614 return error; 615 } 616 617 static int 618 udp6_connect(struct socket *so, struct sockaddr *nam, struct thread *td) 619 { 620 struct inpcb *inp; 621 int error; 622 623 inp = so->so_pcb; 624 if (inp == 0) 625 return EINVAL; 626 627 if ((inp->inp_flags & IN6P_IPV6_V6ONLY) == 0) { 628 struct sockaddr_in6 *sin6_p; 629 630 sin6_p = (struct sockaddr_in6 *)nam; 631 if (IN6_IS_ADDR_V4MAPPED(&sin6_p->sin6_addr)) { 632 struct sockaddr_in sin; 633 634 if (inp->inp_faddr.s_addr != INADDR_ANY) 635 return EISCONN; 636 in6_sin6_2_sin(&sin, sin6_p); 637 crit_enter(); 638 error = in_pcbconnect(inp, (struct sockaddr *)&sin, td); 639 crit_exit(); 640 if (error == 0) { 641 inp->inp_vflag |= INP_IPV4; 642 inp->inp_vflag &= ~INP_IPV6; 643 soisconnected(so); 644 } 645 return error; 646 } 647 } 648 if (!IN6_IS_ADDR_UNSPECIFIED(&inp->in6p_faddr)) 649 return EISCONN; 650 if (inp->inp_flags & INP_WILDCARD) 651 in_pcbremwildcardhash(inp); 652 crit_enter(); 653 error = in6_pcbconnect(inp, nam, td); 654 crit_exit(); 655 if (error == 0) { 656 if (!ip6_v6only) { /* should be non mapped addr */ 657 inp->inp_vflag &= ~INP_IPV4; 658 inp->inp_vflag |= INP_IPV6; 659 } 660 soisconnected(so); 661 } else if (error == EAFNOSUPPORT) { /* connection dissolved */ 662 /* 663 * Follow traditional BSD behavior and retain 664 * the local port binding. But, fix the old misbehavior 665 * of overwriting any previously bound local address. 666 */ 667 if (!(inp->inp_flags & INP_WASBOUND_NOTANY)) 668 inp->in6p_laddr = in6addr_any; 669 in_pcbinswildcardhash(inp); 670 } 671 return error; 672 } 673 674 static int 675 udp6_detach(struct socket *so) 676 { 677 struct inpcb *inp; 678 679 inp = so->so_pcb; 680 if (inp == 0) 681 return EINVAL; 682 crit_enter(); 683 in6_pcbdetach(inp); 684 crit_exit(); 685 return 0; 686 } 687 688 static int 689 udp6_disconnect(struct socket *so) 690 { 691 struct inpcb *inp; 692 693 inp = so->so_pcb; 694 if (inp == 0) 695 return EINVAL; 696 697 if (inp->inp_vflag & INP_IPV4) { 698 const struct pr_usrreqs *pru; 699 700 pru = inetsw[ip_protox[IPPROTO_UDP]].pr_usrreqs; 701 return ((*pru->pru_disconnect)(so)); 702 } 703 704 if (IN6_IS_ADDR_UNSPECIFIED(&inp->in6p_faddr)) 705 return ENOTCONN; 706 707 crit_enter(); 708 in6_pcbdisconnect(inp); 709 crit_exit(); 710 so->so_state &= ~SS_ISCONNECTED; /* XXX */ 711 return 0; 712 } 713 714 static int 715 udp6_send(struct socket *so, int flags, struct mbuf *m, struct sockaddr *addr, 716 struct mbuf *control, struct thread *td) 717 { 718 struct inpcb *inp; 719 int error = 0; 720 721 inp = so->so_pcb; 722 if (inp == 0) { 723 error = EINVAL; 724 goto bad; 725 } 726 727 if (addr) { 728 if (addr->sa_len != sizeof(struct sockaddr_in6)) { 729 error = EINVAL; 730 goto bad; 731 } 732 if (addr->sa_family != AF_INET6) { 733 error = EAFNOSUPPORT; 734 goto bad; 735 } 736 } 737 738 if (!ip6_v6only) { 739 int hasv4addr; 740 struct sockaddr_in6 *sin6 = 0; 741 742 if (addr == 0) 743 hasv4addr = (inp->inp_vflag & INP_IPV4); 744 else { 745 sin6 = (struct sockaddr_in6 *)addr; 746 hasv4addr = IN6_IS_ADDR_V4MAPPED(&sin6->sin6_addr) 747 ? 1 : 0; 748 } 749 if (hasv4addr) { 750 const struct pr_usrreqs *pru; 751 752 if (sin6) 753 in6_sin6_2_sin_in_sock(addr); 754 pru = inetsw[ip_protox[IPPROTO_UDP]].pr_usrreqs; 755 error = ((*pru->pru_send)(so, flags, m, addr, 756 control, td)); 757 /* addr will just be freed in sendit(). */ 758 return error; 759 } 760 } 761 762 return udp6_output(inp, m, addr, control, td); 763 764 bad: 765 m_freem(m); 766 return(error); 767 } 768 769 struct pr_usrreqs udp6_usrreqs = { 770 udp6_abort, pru_accept_notsupp, udp6_attach, udp6_bind, udp6_connect, 771 pru_connect2_notsupp, in6_control, udp6_detach, udp6_disconnect, 772 pru_listen_notsupp, in6_mapped_peeraddr, pru_rcvd_notsupp, 773 pru_rcvoob_notsupp, udp6_send, pru_sense_null, udp_shutdown, 774 in6_mapped_sockaddr, sosend, soreceive, sopoll 775 }; 776