udp6_usrreq.c revision 170587
1/* $FreeBSD: head/sys/netinet6/udp6_usrreq.c 170587 2007-06-12 00:12:01Z rwatson $ */ 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 * 4. Neither the name of the University nor the names of its contributors 46 * may be used to endorse or promote products derived from this software 47 * without specific prior written permission. 48 * 49 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND 50 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 51 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 52 * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE 53 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 54 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 55 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 56 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 57 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 58 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 59 * SUCH DAMAGE. 60 * 61 * @(#)udp_var.h 8.1 (Berkeley) 6/10/93 62 */ 63 64#include "opt_inet.h" 65#include "opt_inet6.h" 66#include "opt_ipsec.h" 67 68#include <sys/param.h> 69#include <sys/errno.h> 70#include <sys/kernel.h> 71#include <sys/lock.h> 72#include <sys/mbuf.h> 73#include <sys/priv.h> 74#include <sys/proc.h> 75#include <sys/protosw.h> 76#include <sys/signalvar.h> 77#include <sys/socket.h> 78#include <sys/socketvar.h> 79#include <sys/stat.h> 80#include <sys/sx.h> 81#include <sys/sysctl.h> 82#include <sys/syslog.h> 83#include <sys/systm.h> 84 85#include <net/if.h> 86#include <net/if_types.h> 87#include <net/route.h> 88 89#include <netinet/in.h> 90#include <netinet/in_pcb.h> 91#include <netinet/in_systm.h> 92#include <netinet/in_var.h> 93#include <netinet/ip.h> 94#include <netinet/ip6.h> 95#include <netinet/icmp6.h> 96#include <netinet/ip_var.h> 97#include <netinet/udp.h> 98#include <netinet/udp_var.h> 99#include <netinet6/ip6protosw.h> 100#include <netinet6/ip6_var.h> 101#include <netinet6/in6_pcb.h> 102#include <netinet6/udp6_var.h> 103#include <netinet6/scope6_var.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 <netipsec/ipsec.h> 112#include <netipsec/ipsec6.h> 113#endif /* FAST_IPSEC */ 114 115/* 116 * UDP protocol inplementation. 117 * Per RFC 768, August, 1980. 118 */ 119 120extern struct protosw inetsw[]; 121static void udp6_detach __P((struct socket *so)); 122 123static void 124udp6_append(struct inpcb *in6p, struct mbuf *n, int off, 125 struct sockaddr_in6 *fromsa) 126{ 127 struct socket *so; 128 struct mbuf *opts; 129 130 /* XXXRW: Not yet: INP_LOCK_ASSERT(in6p); */ 131 132#if defined(IPSEC) || defined(FAST_IPSEC) 133 /* 134 * Check AH/ESP integrity. 135 */ 136 if (ipsec6_in_reject(n, in6p)) { 137 m_freem(n); 138#ifdef IPSEC 139 ipsec6stat.in_polvio++; 140#endif /* IPSEC */ 141 return; 142 } 143#endif /*IPSEC || FAST_IPSEC*/ 144 145 opts = NULL; 146 if (in6p->in6p_flags & IN6P_CONTROLOPTS || 147 in6p->inp_socket->so_options & SO_TIMESTAMP) 148 ip6_savecontrol(in6p, n, &opts); 149 m_adj(n, off + sizeof(struct udphdr)); 150 151 so = in6p->inp_socket; 152 SOCKBUF_LOCK(&so->so_rcv); 153 if (sbappendaddr_locked(&so->so_rcv, (struct sockaddr *)fromsa, n, 154 opts) == 0) { 155 SOCKBUF_UNLOCK(&so->so_rcv); 156 m_freem(n); 157 if (opts) 158 m_freem(opts); 159 udpstat.udps_fullsock++; 160 } else 161 sorwakeup_locked(so); 162} 163 164int 165udp6_input(mp, offp, proto) 166 struct mbuf **mp; 167 int *offp, proto; 168{ 169 struct mbuf *m = *mp; 170 register struct ip6_hdr *ip6; 171 register struct udphdr *uh; 172 register struct inpcb *in6p; 173 int off = *offp; 174 int plen, ulen; 175 struct sockaddr_in6 fromsa; 176 177 ip6 = mtod(m, struct ip6_hdr *); 178 179 if (faithprefix_p != NULL && (*faithprefix_p)(&ip6->ip6_dst)) { 180 /* XXX send icmp6 host/port unreach? */ 181 m_freem(m); 182 return IPPROTO_DONE; 183 } 184 185#ifndef PULLDOWN_TEST 186 IP6_EXTHDR_CHECK(m, off, sizeof(struct udphdr), IPPROTO_DONE); 187 ip6 = mtod(m, struct ip6_hdr *); 188 uh = (struct udphdr *)((caddr_t)ip6 + off); 189#else 190 IP6_EXTHDR_GET(uh, struct udphdr *, m, off, sizeof(*uh)); 191 if (!uh) 192 return IPPROTO_DONE; 193#endif 194 195 udpstat.udps_ipackets++; 196 197 plen = ntohs(ip6->ip6_plen) - off + sizeof(*ip6); 198 ulen = ntohs((u_short)uh->uh_ulen); 199 200 if (plen != ulen) { 201 udpstat.udps_badlen++; 202 goto bad; 203 } 204 205 /* 206 * Checksum extended UDP header and data. 207 */ 208 if (uh->uh_sum == 0) { 209 udpstat.udps_nosum++; 210 goto bad_unlocked; 211 } 212 if (in6_cksum(m, IPPROTO_UDP, off, ulen) != 0) { 213 udpstat.udps_badsum++; 214 goto bad_unlocked; 215 } 216 217 /* 218 * Construct sockaddr format source address. 219 */ 220 init_sin6(&fromsa, m); 221 fromsa.sin6_port = uh->uh_sport; 222 223 INP_INFO_RLOCK(&udbinfo); 224 if (IN6_IS_ADDR_MULTICAST(&ip6->ip6_dst)) { 225 struct inpcb *last; 226 227 /* 228 * Deliver a multicast datagram to all sockets 229 * for which the local and remote addresses and ports match 230 * those of the incoming datagram. This allows more than 231 * one process to receive multicasts on the same port. 232 * (This really ought to be done for unicast datagrams as 233 * well, but that would cause problems with existing 234 * applications that open both address-specific sockets and 235 * a wildcard socket listening to the same port -- they would 236 * end up receiving duplicates of every unicast datagram. 237 * Those applications open the multiple sockets to overcome an 238 * inadequacy of the UDP socket interface, but for backwards 239 * compatibility we avoid the problem here rather than 240 * fixing the interface. Maybe 4.5BSD will remedy this?) 241 */ 242 243 /* 244 * In a case that laddr should be set to the link-local 245 * address (this happens in RIPng), the multicast address 246 * specified in the received packet does not match with 247 * laddr. To cure this situation, the matching is relaxed 248 * if the receiving interface is the same as one specified 249 * in the socket and if the destination multicast address 250 * matches one of the multicast groups specified in the socket. 251 */ 252 253 /* 254 * KAME note: traditionally we dropped udpiphdr from mbuf here. 255 * We need udphdr for IPsec processing so we do that later. 256 */ 257 258 /* 259 * Locate pcb(s) for datagram. 260 * (Algorithm copied from raw_intr().) 261 * 262 * XXXRW: The individual inpcbs need to be locked in the 263 * style of udp_input(). 264 */ 265 last = NULL; 266 LIST_FOREACH(in6p, &udb, inp_list) { 267 if ((in6p->inp_vflag & INP_IPV6) == 0) 268 continue; 269 if (in6p->in6p_lport != uh->uh_dport) 270 continue; 271 if (!IN6_IS_ADDR_UNSPECIFIED(&in6p->in6p_laddr)) { 272 if (!IN6_ARE_ADDR_EQUAL(&in6p->in6p_laddr, 273 &ip6->ip6_dst)) 274 continue; 275 } 276 if (!IN6_IS_ADDR_UNSPECIFIED(&in6p->in6p_faddr)) { 277 if (!IN6_ARE_ADDR_EQUAL(&in6p->in6p_faddr, 278 &ip6->ip6_src) || 279 in6p->in6p_fport != uh->uh_sport) 280 continue; 281 } 282 283 if (last != NULL) { 284 struct mbuf *n; 285 286 if ((n = m_copy(m, 0, M_COPYALL)) != NULL) { 287 INP_LOCK(last); 288 udp6_append(last, n, off, &fromsa); 289 INP_UNLOCK(last); 290 } 291 } 292 last = in6p; 293 /* 294 * Don't look for additional matches if this one does 295 * not have either the SO_REUSEPORT or SO_REUSEADDR 296 * socket options set. This heuristic avoids searching 297 * through all pcbs in the common case of a non-shared 298 * port. It assumes that an application will never 299 * clear these options after setting them. 300 */ 301 if ((last->in6p_socket->so_options & 302 (SO_REUSEPORT|SO_REUSEADDR)) == 0) 303 break; 304 } 305 306 if (last == NULL) { 307 /* 308 * No matching pcb found; discard datagram. 309 * (No need to send an ICMP Port Unreachable 310 * for a broadcast or multicast datgram.) 311 */ 312 udpstat.udps_noport++; 313 udpstat.udps_noportmcast++; 314 goto bad; 315 } 316 INP_LOCK(last); 317 udp6_append(last, m, off, &fromsa); 318 INP_UNLOCK(last); 319 INP_INFO_RUNLOCK(&udbinfo); 320 return IPPROTO_DONE; 321 } 322 /* 323 * Locate pcb for datagram. 324 */ 325 in6p = in6_pcblookup_hash(&udbinfo, &ip6->ip6_src, uh->uh_sport, 326 &ip6->ip6_dst, uh->uh_dport, 1, 327 m->m_pkthdr.rcvif); 328 if (in6p == NULL) { 329 if (udp_log_in_vain) { 330 char ip6bufs[INET6_ADDRSTRLEN]; 331 char ip6bufd[INET6_ADDRSTRLEN]; 332 333 log(LOG_INFO, 334 "Connection attempt to UDP [%s]:%d from [%s]:%d\n", 335 ip6_sprintf(ip6bufd, &ip6->ip6_dst), 336 ntohs(uh->uh_dport), 337 ip6_sprintf(ip6bufs, &ip6->ip6_src), 338 ntohs(uh->uh_sport)); 339 } 340 udpstat.udps_noport++; 341 if (m->m_flags & M_MCAST) { 342 printf("UDP6: M_MCAST is set in a unicast packet.\n"); 343 udpstat.udps_noportmcast++; 344 goto bad; 345 } 346 INP_INFO_RUNLOCK(&udbinfo); 347 icmp6_error(m, ICMP6_DST_UNREACH, ICMP6_DST_UNREACH_NOPORT, 0); 348 return IPPROTO_DONE; 349 } 350 INP_LOCK(in6p); 351 udp6_append(in6p, m, off, &fromsa); 352 INP_UNLOCK(in6p); 353 INP_INFO_RUNLOCK(&udbinfo); 354 return IPPROTO_DONE; 355bad: 356 INP_INFO_RUNLOCK(&udbinfo); 357bad_unlocked: 358 if (m) 359 m_freem(m); 360 return IPPROTO_DONE; 361} 362 363void 364udp6_ctlinput(cmd, sa, d) 365 int cmd; 366 struct sockaddr *sa; 367 void *d; 368{ 369 struct udphdr uh; 370 struct ip6_hdr *ip6; 371 struct mbuf *m; 372 int off = 0; 373 struct ip6ctlparam *ip6cp = NULL; 374 const struct sockaddr_in6 *sa6_src = NULL; 375 void *cmdarg; 376 struct inpcb *(*notify) __P((struct inpcb *, int)) = udp_notify; 377 struct udp_portonly { 378 u_int16_t uh_sport; 379 u_int16_t uh_dport; 380 } *uhp; 381 382 if (sa->sa_family != AF_INET6 || 383 sa->sa_len != sizeof(struct sockaddr_in6)) 384 return; 385 386 if ((unsigned)cmd >= PRC_NCMDS) 387 return; 388 if (PRC_IS_REDIRECT(cmd)) 389 notify = in6_rtchange, d = NULL; 390 else if (cmd == PRC_HOSTDEAD) 391 d = NULL; 392 else if (inet6ctlerrmap[cmd] == 0) 393 return; 394 395 /* if the parameter is from icmp6, decode it. */ 396 if (d != NULL) { 397 ip6cp = (struct ip6ctlparam *)d; 398 m = ip6cp->ip6c_m; 399 ip6 = ip6cp->ip6c_ip6; 400 off = ip6cp->ip6c_off; 401 cmdarg = ip6cp->ip6c_cmdarg; 402 sa6_src = ip6cp->ip6c_src; 403 } else { 404 m = NULL; 405 ip6 = NULL; 406 cmdarg = NULL; 407 sa6_src = &sa6_any; 408 } 409 410 if (ip6) { 411 /* 412 * XXX: We assume that when IPV6 is non NULL, 413 * M and OFF are valid. 414 */ 415 416 /* check if we can safely examine src and dst ports */ 417 if (m->m_pkthdr.len < off + sizeof(*uhp)) 418 return; 419 420 bzero(&uh, sizeof(uh)); 421 m_copydata(m, off, sizeof(*uhp), (caddr_t)&uh); 422 423 (void) in6_pcbnotify(&udbinfo, sa, uh.uh_dport, 424 (struct sockaddr *)ip6cp->ip6c_src, 425 uh.uh_sport, cmd, cmdarg, notify); 426 } else 427 (void) in6_pcbnotify(&udbinfo, sa, 0, 428 (const struct sockaddr *)sa6_src, 429 0, cmd, cmdarg, notify); 430} 431 432static int 433udp6_getcred(SYSCTL_HANDLER_ARGS) 434{ 435 struct xucred xuc; 436 struct sockaddr_in6 addrs[2]; 437 struct inpcb *inp; 438 int error; 439 440 error = priv_check(req->td, PRIV_NETINET_GETCRED); 441 if (error) 442 return (error); 443 444 if (req->newlen != sizeof(addrs)) 445 return (EINVAL); 446 if (req->oldlen != sizeof(struct xucred)) 447 return (EINVAL); 448 error = SYSCTL_IN(req, addrs, sizeof(addrs)); 449 if (error) 450 return (error); 451 if ((error = sa6_embedscope(&addrs[0], ip6_use_defzone)) != 0 || 452 (error = sa6_embedscope(&addrs[1], ip6_use_defzone)) != 0) { 453 return (error); 454 } 455 INP_INFO_RLOCK(&udbinfo); 456 inp = in6_pcblookup_hash(&udbinfo, &addrs[1].sin6_addr, 457 addrs[1].sin6_port, 458 &addrs[0].sin6_addr, addrs[0].sin6_port, 459 1, NULL); 460 if (inp == NULL) { 461 INP_INFO_RUNLOCK(&udbinfo); 462 return (ENOENT); 463 } 464 INP_LOCK(inp); 465 KASSERT(inp->inp_socket != NULL, 466 ("udp6_getcred: inp_socket == NULL")); 467 /* 468 * XXXRW: There should be a scoping access control check here. 469 */ 470 cru2x(inp->inp_socket->so_cred, &xuc); 471 INP_UNLOCK(inp); 472 INP_INFO_RUNLOCK(&udbinfo); 473 error = SYSCTL_OUT(req, &xuc, sizeof(struct xucred)); 474 return (error); 475} 476 477SYSCTL_PROC(_net_inet6_udp6, OID_AUTO, getcred, CTLTYPE_OPAQUE|CTLFLAG_RW, 478 0, 0, 479 udp6_getcred, "S,xucred", "Get the xucred of a UDP6 connection"); 480 481static void 482udp6_abort(struct socket *so) 483{ 484 struct inpcb *inp; 485 486 inp = sotoinpcb(so); 487 KASSERT(inp != NULL, ("udp6_abort: inp == NULL")); 488 489#ifdef INET 490 if (inp->inp_vflag & INP_IPV4) { 491 struct pr_usrreqs *pru; 492 493 pru = inetsw[ip_protox[IPPROTO_UDP]].pr_usrreqs; 494 (*pru->pru_abort)(so); 495 return; 496 } 497#endif 498 499 INP_INFO_WLOCK(&udbinfo); 500 INP_LOCK(inp); 501 if (!IN6_IS_ADDR_UNSPECIFIED(&inp->in6p_faddr)) { 502 in6_pcbdisconnect(inp); 503 inp->in6p_laddr = in6addr_any; 504 soisdisconnected(so); 505 } 506 INP_UNLOCK(inp); 507 INP_INFO_WUNLOCK(&udbinfo); 508} 509 510static int 511udp6_attach(struct socket *so, int proto, struct thread *td) 512{ 513 struct inpcb *inp; 514 int error; 515 516 inp = sotoinpcb(so); 517 KASSERT(inp == NULL, ("udp6_attach: inp != NULL")); 518 519 if (so->so_snd.sb_hiwat == 0 || so->so_rcv.sb_hiwat == 0) { 520 error = soreserve(so, udp_sendspace, udp_recvspace); 521 if (error) 522 return error; 523 } 524 INP_INFO_WLOCK(&udbinfo); 525 error = in_pcballoc(so, &udbinfo); 526 if (error) { 527 INP_INFO_WUNLOCK(&udbinfo); 528 return error; 529 } 530 inp = (struct inpcb *)so->so_pcb; 531 INP_INFO_WUNLOCK(&udbinfo); 532 inp->inp_vflag |= INP_IPV6; 533 if ((inp->inp_flags & IN6P_IPV6_V6ONLY) == 0) 534 inp->inp_vflag |= INP_IPV4; 535 inp->in6p_hops = -1; /* use kernel default */ 536 inp->in6p_cksum = -1; /* just to be sure */ 537 /* 538 * XXX: ugly!! 539 * IPv4 TTL initialization is necessary for an IPv6 socket as well, 540 * because the socket may be bound to an IPv6 wildcard address, 541 * which may match an IPv4-mapped IPv6 address. 542 */ 543 inp->inp_ip_ttl = ip_defttl; 544 INP_UNLOCK(inp); 545 return 0; 546} 547 548static int 549udp6_bind(struct socket *so, struct sockaddr *nam, struct thread *td) 550{ 551 struct inpcb *inp; 552 int error; 553 554 inp = sotoinpcb(so); 555 KASSERT(inp != NULL, ("udp6_bind: inp == NULL")); 556 557 INP_INFO_WLOCK(&udbinfo); 558 INP_LOCK(inp); 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 error = in_pcbbind(inp, (struct sockaddr *)&sin, 575 td->td_ucred); 576 goto out; 577 } 578 } 579 580 error = in6_pcbbind(inp, nam, td->td_ucred); 581out: 582 INP_UNLOCK(inp); 583 INP_INFO_WUNLOCK(&udbinfo); 584 return error; 585} 586 587static void 588udp6_close(struct socket *so) 589{ 590 struct inpcb *inp; 591 592 inp = sotoinpcb(so); 593 KASSERT(inp != NULL, ("udp6_close: inp == NULL")); 594 595#ifdef INET 596 if (inp->inp_vflag & INP_IPV4) { 597 struct pr_usrreqs *pru; 598 599 pru = inetsw[ip_protox[IPPROTO_UDP]].pr_usrreqs; 600 (*pru->pru_disconnect)(so); 601 return; 602 } 603#endif 604 INP_INFO_WLOCK(&udbinfo); 605 INP_LOCK(inp); 606 if (!IN6_IS_ADDR_UNSPECIFIED(&inp->in6p_faddr)) { 607 in6_pcbdisconnect(inp); 608 inp->in6p_laddr = in6addr_any; 609 soisdisconnected(so); 610 } 611 INP_UNLOCK(inp); 612 INP_INFO_WUNLOCK(&udbinfo); 613} 614 615static int 616udp6_connect(struct socket *so, struct sockaddr *nam, struct thread *td) 617{ 618 struct inpcb *inp; 619 int error; 620 621 inp = sotoinpcb(so); 622 KASSERT(inp != NULL, ("udp6_connect: inp == NULL")); 623 624 INP_INFO_WLOCK(&udbinfo); 625 INP_LOCK(inp); 626 if ((inp->inp_flags & IN6P_IPV6_V6ONLY) == 0) { 627 struct sockaddr_in6 *sin6_p; 628 629 sin6_p = (struct sockaddr_in6 *)nam; 630 if (IN6_IS_ADDR_V4MAPPED(&sin6_p->sin6_addr)) { 631 struct sockaddr_in sin; 632 633 if (inp->inp_faddr.s_addr != INADDR_ANY) { 634 error = EISCONN; 635 goto out; 636 } 637 in6_sin6_2_sin(&sin, sin6_p); 638 error = in_pcbconnect(inp, (struct sockaddr *)&sin, 639 td->td_ucred); 640 if (error == 0) { 641 inp->inp_vflag |= INP_IPV4; 642 inp->inp_vflag &= ~INP_IPV6; 643 soisconnected(so); 644 } 645 goto out; 646 } 647 } 648 if (!IN6_IS_ADDR_UNSPECIFIED(&inp->in6p_faddr)) { 649 error = EISCONN; 650 goto out; 651 } 652 error = in6_pcbconnect(inp, nam, td->td_ucred); 653 if (error == 0) { 654 if ((inp->inp_flags & IN6P_IPV6_V6ONLY) == 0) { 655 /* should be non mapped addr */ 656 inp->inp_vflag &= ~INP_IPV4; 657 inp->inp_vflag |= INP_IPV6; 658 } 659 soisconnected(so); 660 } 661out: 662 INP_UNLOCK(inp); 663 INP_INFO_WUNLOCK(&udbinfo); 664 return error; 665} 666 667static void 668udp6_detach(struct socket *so) 669{ 670 struct inpcb *inp; 671 672 inp = sotoinpcb(so); 673 KASSERT(inp != NULL, ("udp6_detach: inp == NULL")); 674 675 INP_INFO_WLOCK(&udbinfo); 676 INP_LOCK(inp); 677 in6_pcbdetach(inp); 678 in6_pcbfree(inp); 679 INP_INFO_WUNLOCK(&udbinfo); 680} 681 682static int 683udp6_disconnect(struct socket *so) 684{ 685 struct inpcb *inp; 686 int error; 687 688 inp = sotoinpcb(so); 689 KASSERT(inp != NULL, ("udp6_disconnect: inp == NULL")); 690 691 INP_INFO_WLOCK(&udbinfo); 692 INP_LOCK(inp); 693 694#ifdef INET 695 if (inp->inp_vflag & INP_IPV4) { 696 struct pr_usrreqs *pru; 697 698 pru = inetsw[ip_protox[IPPROTO_UDP]].pr_usrreqs; 699 error = (*pru->pru_disconnect)(so); 700 goto out; 701 } 702#endif 703 704 if (IN6_IS_ADDR_UNSPECIFIED(&inp->in6p_faddr)) { 705 error = ENOTCONN; 706 goto out; 707 } 708 709 in6_pcbdisconnect(inp); 710 inp->in6p_laddr = in6addr_any; 711 /* XXXRW: so_state locking? */ 712 so->so_state &= ~SS_ISCONNECTED; /* XXX */ 713out: 714 INP_UNLOCK(inp); 715 INP_INFO_WUNLOCK(&udbinfo); 716 return 0; 717} 718 719static int 720udp6_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 = sotoinpcb(so); 727 KASSERT(inp != NULL, ("udp6_send: inp == NULL")); 728 729 INP_INFO_WLOCK(&udbinfo); 730 INP_LOCK(inp); 731 if (addr) { 732 if (addr->sa_len != sizeof(struct sockaddr_in6)) { 733 error = EINVAL; 734 goto bad; 735 } 736 if (addr->sa_family != AF_INET6) { 737 error = EAFNOSUPPORT; 738 goto bad; 739 } 740 } 741 742#ifdef INET 743 if ((inp->inp_flags & IN6P_IPV6_V6ONLY) == 0) { 744 int hasv4addr; 745 struct sockaddr_in6 *sin6 = 0; 746 747 if (addr == 0) 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 struct pr_usrreqs *pru; 756 757 if (!IN6_IS_ADDR_UNSPECIFIED(&inp->in6p_laddr) && 758 !IN6_IS_ADDR_V4MAPPED(&inp->in6p_laddr)) { 759 /* 760 * when remote addr is IPv4-mapped 761 * address, local addr should not be 762 * an IPv6 address; since you cannot 763 * determine how to map IPv6 source 764 * address to IPv4. 765 */ 766 error = EINVAL; 767 goto out; 768 } 769 if (sin6) 770 in6_sin6_2_sin_in_sock(addr); 771 pru = inetsw[ip_protox[IPPROTO_UDP]].pr_usrreqs; 772 error = ((*pru->pru_send)(so, flags, m, addr, control, 773 td)); 774 /* addr will just be freed in sendit(). */ 775 goto out; 776 } 777 } 778#endif 779 780 error = udp6_output(inp, m, addr, control, td); 781out: 782 INP_UNLOCK(inp); 783 INP_INFO_WUNLOCK(&udbinfo); 784 return error; 785 786 bad: 787 INP_UNLOCK(inp); 788 INP_INFO_WUNLOCK(&udbinfo); 789 m_freem(m); 790 return (error); 791} 792 793struct pr_usrreqs udp6_usrreqs = { 794 .pru_abort = udp6_abort, 795 .pru_attach = udp6_attach, 796 .pru_bind = udp6_bind, 797 .pru_connect = udp6_connect, 798 .pru_control = in6_control, 799 .pru_detach = udp6_detach, 800 .pru_disconnect = udp6_disconnect, 801 .pru_peeraddr = in6_mapped_peeraddr, 802 .pru_send = udp6_send, 803 .pru_shutdown = udp_shutdown, 804 .pru_sockaddr = in6_mapped_sockaddr, 805 .pru_sosetlabel = in_pcbsosetlabel, 806 .pru_close = udp6_close 807}; 808