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 1.26 2007/04/22 01:13:14 dillon 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/priv.h> 86 #include <sys/thread2.h> 87 88 #include <net/if.h> 89 #include <net/route.h> 90 #include <net/if_types.h> 91 92 #include <netinet/in.h> 93 #include <netinet/in_systm.h> 94 #include <netinet/ip.h> 95 #include <netinet/in_pcb.h> 96 #include <netinet/in_var.h> 97 #include <netinet/ip_var.h> 98 #include <netinet/udp.h> 99 #include <netinet/udp_var.h> 100 #include <netinet/ip6.h> 101 #include <netinet6/ip6_var.h> 102 #include <netinet6/in6_pcb.h> 103 #include <netinet/icmp6.h> 104 #include <netinet6/udp6_var.h> 105 #include <netinet6/ip6protosw.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 <netproto/ipsec/ipsec.h> 114 #include <netproto/ipsec/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 in6_mcmatch (struct inpcb *, struct in6_addr *, struct ifnet *); 124 static int udp6_detach (struct socket *so); 125 126 static int 127 in6_mcmatch(struct inpcb *in6p, struct in6_addr *ia6, struct ifnet *ifp) 128 { 129 struct ip6_moptions *im6o = in6p->in6p_moptions; 130 struct in6_multi_mship *imm; 131 132 if (im6o == NULL) 133 return 0; 134 135 for (imm = im6o->im6o_memberships.lh_first; imm != NULL; 136 imm = imm->i6mm_chain.le_next) { 137 if ((ifp == NULL || 138 imm->i6mm_maddr->in6m_ifp == ifp) && 139 IN6_ARE_ADDR_EQUAL(&imm->i6mm_maddr->in6m_addr, 140 ia6)) 141 return 1; 142 } 143 return 0; 144 } 145 146 int 147 udp6_input(struct mbuf **mp, int *offp, int proto) 148 { 149 struct mbuf *m = *mp; 150 struct ip6_hdr *ip6; 151 struct udphdr *uh; 152 struct inpcb *in6p; 153 struct mbuf *opts = NULL; 154 int off = *offp; 155 int plen, ulen; 156 struct sockaddr_in6 udp_in6; 157 158 IP6_EXTHDR_CHECK(m, off, sizeof(struct udphdr), IPPROTO_DONE); 159 160 ip6 = mtod(m, struct ip6_hdr *); 161 162 if (faithprefix_p != NULL && (*faithprefix_p)(&ip6->ip6_dst)) { 163 /* XXX send icmp6 host/port unreach? */ 164 m_freem(m); 165 return IPPROTO_DONE; 166 } 167 168 udpstat.udps_ipackets++; 169 170 plen = ntohs(ip6->ip6_plen) - off + sizeof(*ip6); 171 uh = (struct udphdr *)((caddr_t)ip6 + off); 172 ulen = ntohs((u_short)uh->uh_ulen); 173 174 if (plen != ulen) { 175 udpstat.udps_badlen++; 176 goto bad; 177 } 178 179 /* 180 * Checksum extended UDP header and data. 181 */ 182 if (uh->uh_sum == 0) 183 udpstat.udps_nosum++; 184 else if (in6_cksum(m, IPPROTO_UDP, off, ulen) != 0) { 185 udpstat.udps_badsum++; 186 goto bad; 187 } 188 189 if (IN6_IS_ADDR_MULTICAST(&ip6->ip6_dst)) { 190 struct inpcb *last; 191 192 /* 193 * Deliver a multicast datagram to all sockets 194 * for which the local and remote addresses and ports match 195 * those of the incoming datagram. This allows more than 196 * one process to receive multicasts on the same port. 197 * (This really ought to be done for unicast datagrams as 198 * well, but that would cause problems with existing 199 * applications that open both address-specific sockets and 200 * a wildcard socket listening to the same port -- they would 201 * end up receiving duplicates of every unicast datagram. 202 * Those applications open the multiple sockets to overcome an 203 * inadequacy of the UDP socket interface, but for backwards 204 * compatibility we avoid the problem here rather than 205 * fixing the interface. Maybe 4.5BSD will remedy this?) 206 */ 207 208 /* 209 * In a case that laddr should be set to the link-local 210 * address (this happens in RIPng), the multicast address 211 * specified in the received packet does not match with 212 * laddr. To cure this situation, the matching is relaxed 213 * if the receiving interface is the same as one specified 214 * in the socket and if the destination multicast address 215 * matches one of the multicast groups specified in the socket. 216 */ 217 218 /* 219 * Construct sockaddr format source address. 220 */ 221 init_sin6(&udp_in6, m); /* general init */ 222 udp_in6.sin6_port = uh->uh_sport; 223 /* 224 * KAME note: traditionally we dropped udpiphdr from mbuf here. 225 * We need udphdr for IPsec processing so we do that later. 226 */ 227 228 /* 229 * Locate pcb(s) for datagram. 230 * (Algorithm copied from raw_intr().) 231 */ 232 last = NULL; 233 LIST_FOREACH(in6p, &udbinfo.pcblisthead, inp_list) { 234 if (in6p->inp_flags & INP_PLACEMARKER) 235 continue; 236 if (!(in6p->inp_vflag & INP_IPV6)) 237 continue; 238 if (in6p->in6p_lport != uh->uh_dport) 239 continue; 240 if (!IN6_IS_ADDR_UNSPECIFIED(&in6p->in6p_laddr)) { 241 if (!IN6_ARE_ADDR_EQUAL(&in6p->in6p_laddr, 242 &ip6->ip6_dst) && 243 !in6_mcmatch(in6p, &ip6->ip6_dst, 244 m->m_pkthdr.rcvif)) 245 continue; 246 } 247 if (!IN6_IS_ADDR_UNSPECIFIED(&in6p->in6p_faddr)) { 248 if (!IN6_ARE_ADDR_EQUAL(&in6p->in6p_faddr, 249 &ip6->ip6_src) || 250 in6p->in6p_fport != uh->uh_sport) 251 continue; 252 } 253 254 if (last != NULL) { 255 struct mbuf *n; 256 257 #ifdef IPSEC 258 /* 259 * Check AH/ESP integrity. 260 */ 261 if (ipsec6_in_reject_so(m, last->inp_socket)) 262 ipsec6stat.in_polvio++; 263 /* do not inject data into pcb */ 264 else 265 #endif /* IPSEC */ 266 #ifdef FAST_IPSEC 267 /* 268 * Check AH/ESP integrity. 269 */ 270 if (ipsec6_in_reject(m, last)) 271 ; 272 else 273 #endif /* FAST_IPSEC */ 274 if ((n = m_copy(m, 0, M_COPYALL)) != NULL) { 275 /* 276 * KAME NOTE: do not 277 * m_copy(m, offset, ...) above. 278 * ssb_appendaddr() expects M_PKTHDR, 279 * and m_copy() will copy M_PKTHDR 280 * only if offset is 0. 281 */ 282 if (last->in6p_flags & IN6P_CONTROLOPTS 283 || last->in6p_socket->so_options & SO_TIMESTAMP) 284 ip6_savecontrol(last, &opts, 285 ip6, n); 286 287 m_adj(n, off + sizeof(struct udphdr)); 288 if (ssb_appendaddr(&last->in6p_socket->so_rcv, 289 (struct sockaddr *)&udp_in6, 290 n, opts) == 0) { 291 m_freem(n); 292 if (opts) 293 m_freem(opts); 294 udpstat.udps_fullsock++; 295 } else 296 sorwakeup(last->in6p_socket); 297 opts = NULL; 298 } 299 } 300 last = in6p; 301 /* 302 * Don't look for additional matches if this one does 303 * not have either the SO_REUSEPORT or SO_REUSEADDR 304 * socket options set. This heuristic avoids searching 305 * through all pcbs in the common case of a non-shared 306 * port. It assumes that an application will never 307 * clear these options after setting them. 308 */ 309 if ((last->in6p_socket->so_options & 310 (SO_REUSEPORT | SO_REUSEADDR)) == 0) 311 break; 312 } 313 314 if (last == NULL) { 315 /* 316 * No matching pcb found; discard datagram. 317 * (No need to send an ICMP Port Unreachable 318 * for a broadcast or multicast datgram.) 319 */ 320 udpstat.udps_noport++; 321 udpstat.udps_noportmcast++; 322 goto bad; 323 } 324 #ifdef IPSEC 325 /* 326 * Check AH/ESP integrity. 327 */ 328 if (ipsec6_in_reject_so(m, last->inp_socket)) { 329 ipsec6stat.in_polvio++; 330 goto bad; 331 } 332 #endif /* IPSEC */ 333 #ifdef FAST_IPSEC 334 /* 335 * Check AH/ESP integrity. 336 */ 337 if (ipsec6_in_reject(m, last)) { 338 goto bad; 339 } 340 #endif /* FAST_IPSEC */ 341 if (last->in6p_flags & IN6P_CONTROLOPTS 342 || last->in6p_socket->so_options & SO_TIMESTAMP) 343 ip6_savecontrol(last, &opts, ip6, m); 344 345 m_adj(m, off + sizeof(struct udphdr)); 346 if (ssb_appendaddr(&last->in6p_socket->so_rcv, 347 (struct sockaddr *)&udp_in6, 348 m, opts) == 0) { 349 udpstat.udps_fullsock++; 350 goto bad; 351 } 352 sorwakeup(last->in6p_socket); 353 return IPPROTO_DONE; 354 } 355 /* 356 * Locate pcb for datagram. 357 */ 358 in6p = in6_pcblookup_hash(&udbinfo, &ip6->ip6_src, uh->uh_sport, 359 &ip6->ip6_dst, uh->uh_dport, 1, 360 m->m_pkthdr.rcvif); 361 if (in6p == NULL) { 362 if (log_in_vain) { 363 char buf[INET6_ADDRSTRLEN]; 364 365 strcpy(buf, ip6_sprintf(&ip6->ip6_dst)); 366 log(LOG_INFO, 367 "Connection attempt to UDP [%s]:%d from [%s]:%d\n", 368 buf, ntohs(uh->uh_dport), 369 ip6_sprintf(&ip6->ip6_src), ntohs(uh->uh_sport)); 370 } 371 udpstat.udps_noport++; 372 if (m->m_flags & M_MCAST) { 373 kprintf("UDP6: M_MCAST is set in a unicast packet.\n"); 374 udpstat.udps_noportmcast++; 375 goto bad; 376 } 377 icmp6_error(m, ICMP6_DST_UNREACH, ICMP6_DST_UNREACH_NOPORT, 0); 378 return IPPROTO_DONE; 379 } 380 #ifdef IPSEC 381 /* 382 * Check AH/ESP integrity. 383 */ 384 if (ipsec6_in_reject_so(m, in6p->in6p_socket)) { 385 ipsec6stat.in_polvio++; 386 goto bad; 387 } 388 #endif /* IPSEC */ 389 #ifdef FAST_IPSEC 390 /* 391 * Check AH/ESP integrity. 392 */ 393 if (ipsec6_in_reject(m, in6p)) { 394 goto bad; 395 } 396 #endif /* FAST_IPSEC */ 397 398 /* 399 * Construct sockaddr format source address. 400 * Stuff source address and datagram in user buffer. 401 */ 402 init_sin6(&udp_in6, m); /* general init */ 403 udp_in6.sin6_port = uh->uh_sport; 404 if (in6p->in6p_flags & IN6P_CONTROLOPTS 405 || in6p->in6p_socket->so_options & SO_TIMESTAMP) 406 ip6_savecontrol(in6p, &opts, ip6, m); 407 m_adj(m, off + sizeof(struct udphdr)); 408 if (ssb_appendaddr(&in6p->in6p_socket->so_rcv, 409 (struct sockaddr *)&udp_in6, 410 m, opts) == 0) { 411 udpstat.udps_fullsock++; 412 goto bad; 413 } 414 sorwakeup(in6p->in6p_socket); 415 return IPPROTO_DONE; 416 bad: 417 if (m) 418 m_freem(m); 419 if (opts) 420 m_freem(opts); 421 return IPPROTO_DONE; 422 } 423 424 void 425 udp6_ctlinput(int cmd, struct sockaddr *sa, void *d) 426 { 427 struct udphdr uh; 428 struct ip6_hdr *ip6; 429 struct mbuf *m; 430 int off = 0; 431 struct ip6ctlparam *ip6cp = NULL; 432 const struct sockaddr_in6 *sa6_src = NULL; 433 void (*notify) (struct inpcb *, int) = udp_notify; 434 struct udp_portonly { 435 u_int16_t uh_sport; 436 u_int16_t uh_dport; 437 } *uhp; 438 439 if (sa->sa_family != AF_INET6 || 440 sa->sa_len != sizeof(struct sockaddr_in6)) 441 return; 442 443 if ((unsigned)cmd >= PRC_NCMDS) 444 return; 445 if (PRC_IS_REDIRECT(cmd)) 446 notify = in6_rtchange, d = NULL; 447 else if (cmd == PRC_HOSTDEAD) 448 d = NULL; 449 else if (inet6ctlerrmap[cmd] == 0) 450 return; 451 452 /* if the parameter is from icmp6, decode it. */ 453 if (d != NULL) { 454 ip6cp = (struct ip6ctlparam *)d; 455 m = ip6cp->ip6c_m; 456 ip6 = ip6cp->ip6c_ip6; 457 off = ip6cp->ip6c_off; 458 sa6_src = ip6cp->ip6c_src; 459 } else { 460 m = NULL; 461 ip6 = NULL; 462 sa6_src = &sa6_any; 463 } 464 465 if (ip6) { 466 /* 467 * XXX: We assume that when IPV6 is non NULL, 468 * M and OFF are valid. 469 */ 470 471 /* check if we can safely examine src and dst ports */ 472 if (m->m_pkthdr.len < off + sizeof(*uhp)) 473 return; 474 475 bzero(&uh, sizeof(uh)); 476 m_copydata(m, off, sizeof(*uhp), (caddr_t)&uh); 477 478 in6_pcbnotify(&udbinfo.pcblisthead, sa, uh.uh_dport, 479 (struct sockaddr *)ip6cp->ip6c_src, uh.uh_sport, 480 cmd, 0, notify); 481 } else 482 in6_pcbnotify(&udbinfo.pcblisthead, sa, 0, 483 (const struct sockaddr *)sa6_src, 0, 484 cmd, 0, notify); 485 } 486 487 static int 488 udp6_getcred(SYSCTL_HANDLER_ARGS) 489 { 490 struct sockaddr_in6 addrs[2]; 491 struct inpcb *inp; 492 int error; 493 494 error = priv_check(req->td, PRIV_ROOT); 495 if (error) 496 return (error); 497 498 if (req->newlen != sizeof(addrs)) 499 return (EINVAL); 500 if (req->oldlen != sizeof(struct ucred)) 501 return (EINVAL); 502 error = SYSCTL_IN(req, addrs, sizeof(addrs)); 503 if (error) 504 return (error); 505 crit_enter(); 506 inp = in6_pcblookup_hash(&udbinfo, &addrs[1].sin6_addr, 507 addrs[1].sin6_port, 508 &addrs[0].sin6_addr, addrs[0].sin6_port, 509 1, NULL); 510 if (!inp || !inp->inp_socket) { 511 error = ENOENT; 512 goto out; 513 } 514 error = SYSCTL_OUT(req, inp->inp_socket->so_cred, 515 sizeof(struct ucred)); 516 517 out: 518 crit_exit(); 519 return (error); 520 } 521 522 SYSCTL_PROC(_net_inet6_udp6, OID_AUTO, getcred, CTLTYPE_OPAQUE|CTLFLAG_RW, 523 0, 0, 524 udp6_getcred, "S,ucred", "Get the ucred of a UDP6 connection"); 525 526 static int 527 udp6_abort(struct socket *so) 528 { 529 struct inpcb *inp; 530 531 inp = so->so_pcb; 532 if (inp == NULL) 533 return EINVAL; /* ??? possible? panic instead? */ 534 soisdisconnected(so); 535 crit_enter(); 536 in6_pcbdetach(inp); 537 crit_exit(); 538 return 0; 539 } 540 541 static int 542 udp6_attach(struct socket *so, int proto, struct pru_attach_info *ai) 543 { 544 struct inpcb *inp; 545 int error; 546 547 inp = so->so_pcb; 548 if (inp != NULL) 549 return EINVAL; 550 551 if (so->so_snd.ssb_hiwat == 0 || so->so_rcv.ssb_hiwat == 0) { 552 error = soreserve(so, udp_sendspace, udp_recvspace, 553 ai->sb_rlimit); 554 if (error) 555 return error; 556 } 557 crit_enter(); 558 error = in_pcballoc(so, &udbinfo); 559 crit_exit(); 560 if (error) 561 return error; 562 so->so_port = udp_soport_attach(so); 563 inp = (struct inpcb *)so->so_pcb; 564 inp->inp_vflag |= INP_IPV6; 565 if (!ip6_v6only) 566 inp->inp_vflag |= INP_IPV4; 567 inp->in6p_hops = -1; /* use kernel default */ 568 inp->in6p_cksum = -1; /* just to be sure */ 569 /* 570 * XXX: ugly!! 571 * IPv4 TTL initialization is necessary for an IPv6 socket as well, 572 * because the socket may be bound to an IPv6 wildcard address, 573 * which may match an IPv4-mapped IPv6 address. 574 */ 575 inp->inp_ip_ttl = ip_defttl; 576 return 0; 577 } 578 579 static int 580 udp6_bind(struct socket *so, struct sockaddr *nam, struct thread *td) 581 { 582 struct sockaddr_in6 *sin6_p = (struct sockaddr_in6 *)nam; 583 struct inpcb *inp; 584 int error; 585 586 inp = so->so_pcb; 587 if (inp == NULL) 588 return EINVAL; 589 590 inp->inp_vflag &= ~INP_IPV4; 591 inp->inp_vflag |= INP_IPV6; 592 if (!(inp->inp_flags & IN6P_IPV6_V6ONLY)) { 593 if (IN6_IS_ADDR_UNSPECIFIED(&sin6_p->sin6_addr)) 594 inp->inp_vflag |= INP_IPV4; 595 else if (IN6_IS_ADDR_V4MAPPED(&sin6_p->sin6_addr)) { 596 struct sockaddr_in sin; 597 598 in6_sin6_2_sin(&sin, sin6_p); 599 inp->inp_vflag |= INP_IPV4; 600 inp->inp_vflag &= ~INP_IPV6; 601 crit_enter(); 602 error = in_pcbbind(inp, (struct sockaddr *)&sin, td); 603 crit_exit(); 604 return error; 605 } 606 } 607 608 crit_enter(); 609 error = in6_pcbbind(inp, nam, td); 610 crit_exit(); 611 if (error == 0) { 612 if (IN6_IS_ADDR_UNSPECIFIED(&sin6_p->sin6_addr)) 613 inp->inp_flags |= INP_WASBOUND_NOTANY; 614 in_pcbinswildcardhash(inp); 615 } 616 return error; 617 } 618 619 static int 620 udp6_connect(struct socket *so, struct sockaddr *nam, struct thread *td) 621 { 622 struct inpcb *inp; 623 int error; 624 625 inp = so->so_pcb; 626 if (inp == NULL) 627 return EINVAL; 628 629 if (!(inp->inp_flags & IN6P_IPV6_V6ONLY)) { 630 struct sockaddr_in6 *sin6_p; 631 632 sin6_p = (struct sockaddr_in6 *)nam; 633 if (IN6_IS_ADDR_V4MAPPED(&sin6_p->sin6_addr)) { 634 struct sockaddr_in sin; 635 636 if (inp->inp_faddr.s_addr != INADDR_ANY) 637 return EISCONN; 638 in6_sin6_2_sin(&sin, sin6_p); 639 crit_enter(); 640 error = in_pcbconnect(inp, (struct sockaddr *)&sin, td); 641 crit_exit(); 642 if (error == 0) { 643 inp->inp_vflag |= INP_IPV4; 644 inp->inp_vflag &= ~INP_IPV6; 645 soisconnected(so); 646 } 647 return error; 648 } 649 } 650 if (!IN6_IS_ADDR_UNSPECIFIED(&inp->in6p_faddr)) 651 return EISCONN; 652 if (inp->inp_flags & INP_WILDCARD) 653 in_pcbremwildcardhash(inp); 654 if (!prison_remote_ip(td, nam)) 655 return(EAFNOSUPPORT); /* IPv4 only jail */ 656 crit_enter(); 657 error = in6_pcbconnect(inp, nam, td); 658 crit_exit(); 659 if (error == 0) { 660 if (!ip6_v6only) { /* should be non mapped addr */ 661 inp->inp_vflag &= ~INP_IPV4; 662 inp->inp_vflag |= INP_IPV6; 663 } 664 /* sosetport(so, port); here, see udp v4 code */ 665 soisconnected(so); 666 } else if (error == EAFNOSUPPORT) { /* connection dissolved */ 667 /* 668 * Follow traditional BSD behavior and retain 669 * the local port binding. But, fix the old misbehavior 670 * of overwriting any previously bound local address. 671 */ 672 if (!(inp->inp_flags & INP_WASBOUND_NOTANY)) 673 inp->in6p_laddr = kin6addr_any; 674 in_pcbinswildcardhash(inp); 675 } 676 return error; 677 } 678 679 static int 680 udp6_detach(struct socket *so) 681 { 682 struct inpcb *inp; 683 684 inp = so->so_pcb; 685 if (inp == NULL) 686 return EINVAL; 687 crit_enter(); 688 in6_pcbdetach(inp); 689 crit_exit(); 690 return 0; 691 } 692 693 static int 694 udp6_disconnect(struct socket *so) 695 { 696 struct inpcb *inp; 697 698 inp = so->so_pcb; 699 if (inp == NULL) 700 return EINVAL; 701 702 if (inp->inp_vflag & INP_IPV4) { 703 const struct pr_usrreqs *pru; 704 705 pru = inetsw[ip_protox[IPPROTO_UDP]].pr_usrreqs; 706 return ((*pru->pru_disconnect)(so)); 707 } 708 709 if (IN6_IS_ADDR_UNSPECIFIED(&inp->in6p_faddr)) 710 return ENOTCONN; 711 712 crit_enter(); 713 in6_pcbdisconnect(inp); 714 crit_exit(); 715 so->so_state &= ~SS_ISCONNECTED; /* XXX */ 716 return 0; 717 } 718 719 static int 720 udp6_send(struct socket *so, int flags, struct mbuf *m, struct sockaddr *addr, 721 struct mbuf *control, struct thread *td) 722 { 723 struct inpcb *inp; 724 int error = 0; 725 726 inp = so->so_pcb; 727 if (inp == NULL) { 728 error = EINVAL; 729 goto bad; 730 } 731 732 if (addr) { 733 if (addr->sa_len != sizeof(struct sockaddr_in6)) { 734 error = EINVAL; 735 goto bad; 736 } 737 if (addr->sa_family != AF_INET6) { 738 error = EAFNOSUPPORT; 739 goto bad; 740 } 741 } 742 743 if (!ip6_v6only) { 744 int hasv4addr; 745 struct sockaddr_in6 *sin6 = 0; 746 747 if (addr == NULL) 748 hasv4addr = (inp->inp_vflag & INP_IPV4); 749 else { 750 sin6 = (struct sockaddr_in6 *)addr; 751 hasv4addr = IN6_IS_ADDR_V4MAPPED(&sin6->sin6_addr) 752 ? 1 : 0; 753 } 754 if (hasv4addr) { 755 const struct pr_usrreqs *pru; 756 757 if (sin6) 758 in6_sin6_2_sin_in_sock(addr); 759 pru = inetsw[ip_protox[IPPROTO_UDP]].pr_usrreqs; 760 error = ((*pru->pru_send)(so, flags, m, addr, 761 control, td)); 762 /* addr will just be freed in sendit(). */ 763 return error; 764 } 765 } 766 767 return udp6_output(inp, m, addr, control, td); 768 769 bad: 770 m_freem(m); 771 return (error); 772 } 773 774 struct pr_usrreqs udp6_usrreqs = { 775 .pru_abort = udp6_abort, 776 .pru_accept = pru_accept_notsupp, 777 .pru_attach = udp6_attach, 778 .pru_bind = udp6_bind, 779 .pru_connect = udp6_connect, 780 .pru_connect2 = pru_connect2_notsupp, 781 .pru_control = in6_control, 782 .pru_detach = udp6_detach, 783 .pru_disconnect = udp6_disconnect, 784 .pru_listen = pru_listen_notsupp, 785 .pru_peeraddr = in6_mapped_peeraddr, 786 .pru_rcvd = pru_rcvd_notsupp, 787 .pru_rcvoob = pru_rcvoob_notsupp, 788 .pru_send = udp6_send, 789 .pru_sense = pru_sense_null, 790 .pru_shutdown = udp_shutdown, 791 .pru_sockaddr = in6_mapped_sockaddr, 792 .pru_sosend = sosend, 793 .pru_soreceive = soreceive 794 }; 795 796