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 1.17 2004/10/15 22:59:10 hsu 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 86 #include <net/if.h> 87 #include <net/route.h> 88 #include <net/if_types.h> 89 90 #include <netinet/in.h> 91 #include <netinet/in_systm.h> 92 #include <netinet/ip.h> 93 #include <netinet/in_pcb.h> 94 #include <netinet/in_var.h> 95 #include <netinet/ip_var.h> 96 #include <netinet/udp.h> 97 #include <netinet/udp_var.h> 98 #include <netinet/ip6.h> 99 #include <netinet6/ip6_var.h> 100 #include <netinet6/in6_pcb.h> 101 #include <netinet/icmp6.h> 102 #include <netinet6/udp6_var.h> 103 #include <netinet6/ip6protosw.h> 104 105 #ifdef IPSEC 106 #include <netinet6/ipsec.h> 107 #include <netinet6/ipsec6.h> 108 #endif /* IPSEC */ 109 110 #ifdef FAST_IPSEC 111 #include <netproto/ipsec/ipsec.h> 112 #include <netproto/ipsec/ipsec6.h> 113 #endif /* FAST_IPSEC */ 114 115 /* 116 * UDP protocol inplementation. 117 * Per RFC 768, August, 1980. 118 */ 119 120 extern struct protosw inetsw[]; 121 static int in6_mcmatch (struct inpcb *, struct in6_addr *, struct ifnet *); 122 static int udp6_detach (struct socket *so); 123 124 static int 125 in6_mcmatch(struct inpcb *in6p, struct in6_addr *ia6, struct ifnet *ifp) 126 { 127 struct ip6_moptions *im6o = in6p->in6p_moptions; 128 struct in6_multi_mship *imm; 129 130 if (im6o == NULL) 131 return 0; 132 133 for (imm = im6o->im6o_memberships.lh_first; imm != NULL; 134 imm = imm->i6mm_chain.le_next) { 135 if ((ifp == NULL || 136 imm->i6mm_maddr->in6m_ifp == ifp) && 137 IN6_ARE_ADDR_EQUAL(&imm->i6mm_maddr->in6m_addr, 138 ia6)) 139 return 1; 140 } 141 return 0; 142 } 143 144 int 145 udp6_input(struct mbuf **mp, int *offp, int proto) 146 { 147 struct mbuf *m = *mp; 148 struct ip6_hdr *ip6; 149 struct udphdr *uh; 150 struct inpcb *in6p; 151 struct mbuf *opts = NULL; 152 int off = *offp; 153 int plen, ulen; 154 struct sockaddr_in6 udp_in6; 155 156 IP6_EXTHDR_CHECK(m, off, sizeof(struct udphdr), IPPROTO_DONE); 157 158 ip6 = mtod(m, struct ip6_hdr *); 159 160 if (faithprefix_p != NULL && (*faithprefix_p)(&ip6->ip6_dst)) { 161 /* XXX send icmp6 host/port unreach? */ 162 m_freem(m); 163 return IPPROTO_DONE; 164 } 165 166 udpstat.udps_ipackets++; 167 168 plen = ntohs(ip6->ip6_plen) - off + sizeof(*ip6); 169 uh = (struct udphdr *)((caddr_t)ip6 + off); 170 ulen = ntohs((u_short)uh->uh_ulen); 171 172 if (plen != ulen) { 173 udpstat.udps_badlen++; 174 goto bad; 175 } 176 177 /* 178 * Checksum extended UDP header and data. 179 */ 180 if (uh->uh_sum == 0) 181 udpstat.udps_nosum++; 182 else if (in6_cksum(m, IPPROTO_UDP, off, ulen) != 0) { 183 udpstat.udps_badsum++; 184 goto bad; 185 } 186 187 if (IN6_IS_ADDR_MULTICAST(&ip6->ip6_dst)) { 188 struct inpcb *last; 189 190 /* 191 * Deliver a multicast datagram to all sockets 192 * for which the local and remote addresses and ports match 193 * those of the incoming datagram. This allows more than 194 * one process to receive multicasts on the same port. 195 * (This really ought to be done for unicast datagrams as 196 * well, but that would cause problems with existing 197 * applications that open both address-specific sockets and 198 * a wildcard socket listening to the same port -- they would 199 * end up receiving duplicates of every unicast datagram. 200 * Those applications open the multiple sockets to overcome an 201 * inadequacy of the UDP socket interface, but for backwards 202 * compatibility we avoid the problem here rather than 203 * fixing the interface. Maybe 4.5BSD will remedy this?) 204 */ 205 206 /* 207 * In a case that laddr should be set to the link-local 208 * address (this happens in RIPng), the multicast address 209 * specified in the received packet does not match with 210 * laddr. To cure this situation, the matching is relaxed 211 * if the receiving interface is the same as one specified 212 * in the socket and if the destination multicast address 213 * matches one of the multicast groups specified in the socket. 214 */ 215 216 /* 217 * Construct sockaddr format source address. 218 */ 219 init_sin6(&udp_in6, m); /* general init */ 220 udp_in6.sin6_port = uh->uh_sport; 221 /* 222 * KAME note: traditionally we dropped udpiphdr from mbuf here. 223 * We need udphdr for IPsec processing so we do that later. 224 */ 225 226 /* 227 * Locate pcb(s) for datagram. 228 * (Algorithm copied from raw_intr().) 229 */ 230 last = NULL; 231 LIST_FOREACH(in6p, &udbinfo.pcblisthead, inp_list) { 232 if ((in6p->inp_flags & INP_PLACEMARKER) == 0) 233 continue; 234 if ((in6p->inp_vflag & INP_IPV6) == 0) 235 continue; 236 if (in6p->in6p_lport != uh->uh_dport) 237 continue; 238 if (!IN6_IS_ADDR_UNSPECIFIED(&in6p->in6p_laddr)) { 239 if (!IN6_ARE_ADDR_EQUAL(&in6p->in6p_laddr, 240 &ip6->ip6_dst) && 241 !in6_mcmatch(in6p, &ip6->ip6_dst, 242 m->m_pkthdr.rcvif)) 243 continue; 244 } 245 if (!IN6_IS_ADDR_UNSPECIFIED(&in6p->in6p_faddr)) { 246 if (!IN6_ARE_ADDR_EQUAL(&in6p->in6p_faddr, 247 &ip6->ip6_src) || 248 in6p->in6p_fport != uh->uh_sport) 249 continue; 250 } 251 252 if (last != NULL) { 253 struct mbuf *n; 254 255 #ifdef IPSEC 256 /* 257 * Check AH/ESP integrity. 258 */ 259 if (ipsec6_in_reject_so(m, last->inp_socket)) 260 ipsec6stat.in_polvio++; 261 /* do not inject data into pcb */ 262 else 263 #endif /* IPSEC */ 264 #ifdef FAST_IPSEC 265 /* 266 * Check AH/ESP integrity. 267 */ 268 if (ipsec6_in_reject(m, last)) 269 ; 270 else 271 #endif /* FAST_IPSEC */ 272 if ((n = m_copy(m, 0, M_COPYALL)) != NULL) { 273 /* 274 * KAME NOTE: do not 275 * m_copy(m, offset, ...) above. 276 * sbappendaddr() expects M_PKTHDR, 277 * and m_copy() will copy M_PKTHDR 278 * only if offset is 0. 279 */ 280 if (last->in6p_flags & IN6P_CONTROLOPTS 281 || last->in6p_socket->so_options & SO_TIMESTAMP) 282 ip6_savecontrol(last, &opts, 283 ip6, n); 284 285 m_adj(n, off + sizeof(struct udphdr)); 286 if (sbappendaddr(&last->in6p_socket->so_rcv, 287 (struct sockaddr *)&udp_in6, 288 n, opts) == 0) { 289 m_freem(n); 290 if (opts) 291 m_freem(opts); 292 udpstat.udps_fullsock++; 293 } else 294 sorwakeup(last->in6p_socket); 295 opts = NULL; 296 } 297 } 298 last = in6p; 299 /* 300 * Don't look for additional matches if this one does 301 * not have either the SO_REUSEPORT or SO_REUSEADDR 302 * socket options set. This heuristic avoids searching 303 * through all pcbs in the common case of a non-shared 304 * port. It assumes that an application will never 305 * clear these options after setting them. 306 */ 307 if ((last->in6p_socket->so_options & 308 (SO_REUSEPORT|SO_REUSEADDR)) == 0) 309 break; 310 } 311 312 if (last == NULL) { 313 /* 314 * No matching pcb found; discard datagram. 315 * (No need to send an ICMP Port Unreachable 316 * for a broadcast or multicast datgram.) 317 */ 318 udpstat.udps_noport++; 319 udpstat.udps_noportmcast++; 320 goto bad; 321 } 322 #ifdef IPSEC 323 /* 324 * Check AH/ESP integrity. 325 */ 326 if (ipsec6_in_reject_so(m, last->inp_socket)) { 327 ipsec6stat.in_polvio++; 328 goto bad; 329 } 330 #endif /* IPSEC */ 331 #ifdef FAST_IPSEC 332 /* 333 * Check AH/ESP integrity. 334 */ 335 if (ipsec6_in_reject(m, last)) { 336 goto bad; 337 } 338 #endif /* FAST_IPSEC */ 339 if (last->in6p_flags & IN6P_CONTROLOPTS 340 || last->in6p_socket->so_options & SO_TIMESTAMP) 341 ip6_savecontrol(last, &opts, ip6, m); 342 343 m_adj(m, off + sizeof(struct udphdr)); 344 if (sbappendaddr(&last->in6p_socket->so_rcv, 345 (struct sockaddr *)&udp_in6, 346 m, opts) == 0) { 347 udpstat.udps_fullsock++; 348 goto bad; 349 } 350 sorwakeup(last->in6p_socket); 351 return IPPROTO_DONE; 352 } 353 /* 354 * Locate pcb for datagram. 355 */ 356 in6p = in6_pcblookup_hash(&udbinfo, &ip6->ip6_src, uh->uh_sport, 357 &ip6->ip6_dst, uh->uh_dport, 1, 358 m->m_pkthdr.rcvif); 359 if (in6p == 0) { 360 if (log_in_vain) { 361 char buf[INET6_ADDRSTRLEN]; 362 363 strcpy(buf, ip6_sprintf(&ip6->ip6_dst)); 364 log(LOG_INFO, 365 "Connection attempt to UDP [%s]:%d from [%s]:%d\n", 366 buf, ntohs(uh->uh_dport), 367 ip6_sprintf(&ip6->ip6_src), ntohs(uh->uh_sport)); 368 } 369 udpstat.udps_noport++; 370 if (m->m_flags & M_MCAST) { 371 printf("UDP6: M_MCAST is set in a unicast packet.\n"); 372 udpstat.udps_noportmcast++; 373 goto bad; 374 } 375 icmp6_error(m, ICMP6_DST_UNREACH, ICMP6_DST_UNREACH_NOPORT, 0); 376 return IPPROTO_DONE; 377 } 378 #ifdef IPSEC 379 /* 380 * Check AH/ESP integrity. 381 */ 382 if (ipsec6_in_reject_so(m, in6p->in6p_socket)) { 383 ipsec6stat.in_polvio++; 384 goto bad; 385 } 386 #endif /* IPSEC */ 387 #ifdef FAST_IPSEC 388 /* 389 * Check AH/ESP integrity. 390 */ 391 if (ipsec6_in_reject(m, in6p)) { 392 goto bad; 393 } 394 #endif /* FAST_IPSEC */ 395 396 /* 397 * Construct sockaddr format source address. 398 * Stuff source address and datagram in user buffer. 399 */ 400 init_sin6(&udp_in6, m); /* general init */ 401 udp_in6.sin6_port = uh->uh_sport; 402 if (in6p->in6p_flags & IN6P_CONTROLOPTS 403 || in6p->in6p_socket->so_options & SO_TIMESTAMP) 404 ip6_savecontrol(in6p, &opts, ip6, m); 405 m_adj(m, off + sizeof(struct udphdr)); 406 if (sbappendaddr(&in6p->in6p_socket->so_rcv, 407 (struct sockaddr *)&udp_in6, 408 m, opts) == 0) { 409 udpstat.udps_fullsock++; 410 goto bad; 411 } 412 sorwakeup(in6p->in6p_socket); 413 return IPPROTO_DONE; 414 bad: 415 if (m) 416 m_freem(m); 417 if (opts) 418 m_freem(opts); 419 return IPPROTO_DONE; 420 } 421 422 void 423 udp6_ctlinput(int cmd, struct sockaddr *sa, void *d) 424 { 425 struct udphdr uh; 426 struct ip6_hdr *ip6; 427 struct mbuf *m; 428 int off = 0; 429 struct ip6ctlparam *ip6cp = NULL; 430 const struct sockaddr_in6 *sa6_src = NULL; 431 void (*notify) (struct inpcb *, int) = udp_notify; 432 struct udp_portonly { 433 u_int16_t uh_sport; 434 u_int16_t uh_dport; 435 } *uhp; 436 437 if (sa->sa_family != AF_INET6 || 438 sa->sa_len != sizeof(struct sockaddr_in6)) 439 return; 440 441 if ((unsigned)cmd >= PRC_NCMDS) 442 return; 443 if (PRC_IS_REDIRECT(cmd)) 444 notify = in6_rtchange, d = NULL; 445 else if (cmd == PRC_HOSTDEAD) 446 d = NULL; 447 else if (inet6ctlerrmap[cmd] == 0) 448 return; 449 450 /* if the parameter is from icmp6, decode it. */ 451 if (d != NULL) { 452 ip6cp = (struct ip6ctlparam *)d; 453 m = ip6cp->ip6c_m; 454 ip6 = ip6cp->ip6c_ip6; 455 off = ip6cp->ip6c_off; 456 sa6_src = ip6cp->ip6c_src; 457 } else { 458 m = NULL; 459 ip6 = NULL; 460 sa6_src = &sa6_any; 461 } 462 463 if (ip6) { 464 /* 465 * XXX: We assume that when IPV6 is non NULL, 466 * M and OFF are valid. 467 */ 468 469 /* check if we can safely examine src and dst ports */ 470 if (m->m_pkthdr.len < off + sizeof(*uhp)) 471 return; 472 473 bzero(&uh, sizeof(uh)); 474 m_copydata(m, off, sizeof(*uhp), (caddr_t)&uh); 475 476 (void) in6_pcbnotify(&udbinfo.pcblisthead, sa, uh.uh_dport, 477 (struct sockaddr *)ip6cp->ip6c_src, 478 uh.uh_sport, cmd, notify); 479 } else 480 (void) in6_pcbnotify(&udbinfo.pcblisthead, sa, 0, 481 (const struct sockaddr *)sa6_src, 482 0, cmd, notify); 483 } 484 485 static int 486 udp6_getcred(SYSCTL_HANDLER_ARGS) 487 { 488 struct sockaddr_in6 addrs[2]; 489 struct inpcb *inp; 490 int error, s; 491 492 error = suser(req->td); 493 if (error) 494 return (error); 495 496 if (req->newlen != sizeof(addrs)) 497 return (EINVAL); 498 if (req->oldlen != sizeof(struct ucred)) 499 return (EINVAL); 500 error = SYSCTL_IN(req, addrs, sizeof(addrs)); 501 if (error) 502 return (error); 503 s = splnet(); 504 inp = in6_pcblookup_hash(&udbinfo, &addrs[1].sin6_addr, 505 addrs[1].sin6_port, 506 &addrs[0].sin6_addr, addrs[0].sin6_port, 507 1, NULL); 508 if (!inp || !inp->inp_socket) { 509 error = ENOENT; 510 goto out; 511 } 512 error = SYSCTL_OUT(req, inp->inp_socket->so_cred, 513 sizeof(struct ucred)); 514 515 out: 516 splx(s); 517 return (error); 518 } 519 520 SYSCTL_PROC(_net_inet6_udp6, OID_AUTO, getcred, CTLTYPE_OPAQUE|CTLFLAG_RW, 521 0, 0, 522 udp6_getcred, "S,ucred", "Get the ucred of a UDP6 connection"); 523 524 static int 525 udp6_abort(struct socket *so) 526 { 527 struct inpcb *inp; 528 int s; 529 530 inp = sotoinpcb(so); 531 if (inp == 0) 532 return EINVAL; /* ??? possible? panic instead? */ 533 soisdisconnected(so); 534 s = splnet(); 535 in6_pcbdetach(inp); 536 splx(s); 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 s, error; 545 546 inp = sotoinpcb(so); 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 s = splnet(); 557 error = in_pcballoc(so, &udbinfo); 558 splx(s); 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 s, error; 583 584 inp = sotoinpcb(so); 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 s = splnet(); 600 error = in_pcbbind(inp, (struct sockaddr *)&sin, td); 601 splx(s); 602 return error; 603 } 604 } 605 606 s = splnet(); 607 error = in6_pcbbind(inp, nam, td); 608 splx(s); 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 s, error; 622 623 inp = sotoinpcb(so); 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 s = splnet(); 638 error = in_pcbconnect(inp, (struct sockaddr *)&sin, td); 639 splx(s); 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 s = splnet(); 653 error = in6_pcbconnect(inp, nam, td); 654 splx(s); 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 int s; 679 680 inp = sotoinpcb(so); 681 if (inp == 0) 682 return EINVAL; 683 s = splnet(); 684 in6_pcbdetach(inp); 685 splx(s); 686 return 0; 687 } 688 689 static int 690 udp6_disconnect(struct socket *so) 691 { 692 struct inpcb *inp; 693 int s; 694 695 inp = sotoinpcb(so); 696 if (inp == 0) 697 return EINVAL; 698 699 if (inp->inp_vflag & INP_IPV4) { 700 const struct pr_usrreqs *pru; 701 702 pru = inetsw[ip_protox[IPPROTO_UDP]].pr_usrreqs; 703 return ((*pru->pru_disconnect)(so)); 704 } 705 706 if (IN6_IS_ADDR_UNSPECIFIED(&inp->in6p_faddr)) 707 return ENOTCONN; 708 709 s = splnet(); 710 in6_pcbdisconnect(inp); 711 splx(s); 712 so->so_state &= ~SS_ISCONNECTED; /* XXX */ 713 return 0; 714 } 715 716 static int 717 udp6_send(struct socket *so, int flags, struct mbuf *m, struct sockaddr *addr, 718 struct mbuf *control, struct thread *td) 719 { 720 struct inpcb *inp; 721 int error = 0; 722 723 inp = sotoinpcb(so); 724 if (inp == 0) { 725 error = EINVAL; 726 goto bad; 727 } 728 729 if (addr) { 730 if (addr->sa_len != sizeof(struct sockaddr_in6)) { 731 error = EINVAL; 732 goto bad; 733 } 734 if (addr->sa_family != AF_INET6) { 735 error = EAFNOSUPPORT; 736 goto bad; 737 } 738 } 739 740 if (!ip6_v6only) { 741 int hasv4addr; 742 struct sockaddr_in6 *sin6 = 0; 743 744 if (addr == 0) 745 hasv4addr = (inp->inp_vflag & INP_IPV4); 746 else { 747 sin6 = (struct sockaddr_in6 *)addr; 748 hasv4addr = IN6_IS_ADDR_V4MAPPED(&sin6->sin6_addr) 749 ? 1 : 0; 750 } 751 if (hasv4addr) { 752 const struct pr_usrreqs *pru; 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, 758 control, td)); 759 /* addr will just be freed in sendit(). */ 760 return error; 761 } 762 } 763 764 return udp6_output(inp, m, addr, control, td); 765 766 bad: 767 m_freem(m); 768 return(error); 769 } 770 771 struct pr_usrreqs udp6_usrreqs = { 772 udp6_abort, pru_accept_notsupp, udp6_attach, udp6_bind, udp6_connect, 773 pru_connect2_notsupp, in6_control, udp6_detach, udp6_disconnect, 774 pru_listen_notsupp, in6_mapped_peeraddr, pru_rcvd_notsupp, 775 pru_rcvoob_notsupp, udp6_send, pru_sense_null, udp_shutdown, 776 in6_mapped_sockaddr, sosend, soreceive, sopoll 777 }; 778