1 /*- 2 * Copyright (C) 1995, 1996, 1997, and 1998 WIDE Project. 3 * All rights reserved. 4 * 5 * Redistribution and use in source and binary forms, with or without 6 * modification, are permitted provided that the following conditions 7 * are met: 8 * 1. Redistributions of source code must retain the above copyright 9 * notice, this list of conditions and the following disclaimer. 10 * 2. Redistributions in binary form must reproduce the above copyright 11 * notice, this list of conditions and the following disclaimer in the 12 * documentation and/or other materials provided with the distribution. 13 * 3. Neither the name of the project nor the names of its contributors 14 * may be used to endorse or promote products derived from this software 15 * without specific prior written permission. 16 * 17 * THIS SOFTWARE IS PROVIDED BY THE PROJECT AND CONTRIBUTORS ``AS IS'' AND 18 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 19 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 20 * ARE DISCLAIMED. IN NO EVENT SHALL THE PROJECT OR CONTRIBUTORS BE LIABLE 21 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 22 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 23 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 24 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 25 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 26 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 27 * SUCH DAMAGE. 28 * 29 * $KAME: in6_pcb.c,v 1.31 2001/05/21 05:45:10 jinmei Exp $ 30 */ 31 32 /*- 33 * Copyright (c) 1982, 1986, 1991, 1993 34 * The Regents of the University of California. All rights reserved. 35 * 36 * Redistribution and use in source and binary forms, with or without 37 * modification, are permitted provided that the following conditions 38 * are met: 39 * 1. Redistributions of source code must retain the above copyright 40 * notice, this list of conditions and the following disclaimer. 41 * 2. Redistributions in binary form must reproduce the above copyright 42 * notice, this list of conditions and the following disclaimer in the 43 * documentation and/or other materials provided with the distribution. 44 * 4. Neither the name of the University nor the names of its contributors 45 * may be used to endorse or promote products derived from this software 46 * without specific prior written permission. 47 * 48 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND 49 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 50 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 51 * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE 52 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 53 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 54 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 55 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 56 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 57 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 58 * SUCH DAMAGE. 59 * 60 * @(#)in_pcb.c 8.2 (Berkeley) 1/4/94 61 */ 62 63 #include <sys/cdefs.h> 64 __FBSDID("$FreeBSD$"); 65 66 #include "opt_inet.h" 67 #include "opt_inet6.h" 68 #include "opt_ipsec.h" 69 70 #include <sys/param.h> 71 #include <sys/systm.h> 72 #include <sys/malloc.h> 73 #include <sys/mbuf.h> 74 #include <sys/domain.h> 75 #include <sys/protosw.h> 76 #include <sys/socket.h> 77 #include <sys/socketvar.h> 78 #include <sys/sockio.h> 79 #include <sys/errno.h> 80 #include <sys/time.h> 81 #include <sys/priv.h> 82 #include <sys/proc.h> 83 #include <sys/jail.h> 84 85 #include <vm/uma.h> 86 87 #include <net/if.h> 88 #include <net/if_types.h> 89 #include <net/route.h> 90 91 #include <netinet/in.h> 92 #include <netinet/in_var.h> 93 #include <netinet/in_systm.h> 94 #include <netinet/tcp_var.h> 95 #include <netinet/ip6.h> 96 #include <netinet/ip_var.h> 97 #include <netinet6/ip6_var.h> 98 #include <netinet6/nd6.h> 99 #include <netinet/in_pcb.h> 100 #include <netinet6/in6_pcb.h> 101 #include <netinet6/scope6_var.h> 102 103 #ifdef IPSEC 104 #include <netipsec/ipsec.h> 105 #include <netipsec/ipsec6.h> 106 #include <netipsec/key.h> 107 #endif /* IPSEC */ 108 109 struct in6_addr zeroin6_addr; 110 111 int 112 in6_pcbbind(register struct inpcb *inp, struct sockaddr *nam, 113 struct ucred *cred) 114 { 115 struct socket *so = inp->inp_socket; 116 struct sockaddr_in6 *sin6 = (struct sockaddr_in6 *)NULL; 117 struct inpcbinfo *pcbinfo = inp->inp_pcbinfo; 118 u_short lport = 0; 119 int wild = 0, reuseport = (so->so_options & SO_REUSEPORT); 120 121 INP_INFO_WLOCK_ASSERT(pcbinfo); 122 INP_LOCK_ASSERT(inp); 123 124 if (!in6_ifaddr) /* XXX broken! */ 125 return (EADDRNOTAVAIL); 126 if (inp->inp_lport || !IN6_IS_ADDR_UNSPECIFIED(&inp->in6p_laddr)) 127 return (EINVAL); 128 if ((so->so_options & (SO_REUSEADDR|SO_REUSEPORT)) == 0) 129 wild = INPLOOKUP_WILDCARD; 130 if (nam) { 131 int error; 132 133 sin6 = (struct sockaddr_in6 *)nam; 134 if (nam->sa_len != sizeof(*sin6)) 135 return (EINVAL); 136 /* 137 * family check. 138 */ 139 if (nam->sa_family != AF_INET6) 140 return (EAFNOSUPPORT); 141 142 if ((error = sa6_embedscope(sin6, ip6_use_defzone)) != 0) 143 return(error); 144 145 lport = sin6->sin6_port; 146 if (IN6_IS_ADDR_MULTICAST(&sin6->sin6_addr)) { 147 /* 148 * Treat SO_REUSEADDR as SO_REUSEPORT for multicast; 149 * allow compepte duplication of binding if 150 * SO_REUSEPORT is set, or if SO_REUSEADDR is set 151 * and a multicast address is bound on both 152 * new and duplicated sockets. 153 */ 154 if (so->so_options & SO_REUSEADDR) 155 reuseport = SO_REUSEADDR|SO_REUSEPORT; 156 } else if (!IN6_IS_ADDR_UNSPECIFIED(&sin6->sin6_addr)) { 157 struct ifaddr *ia = NULL; 158 159 sin6->sin6_port = 0; /* yech... */ 160 if ((ia = ifa_ifwithaddr((struct sockaddr *)sin6)) == 0) 161 return (EADDRNOTAVAIL); 162 163 /* 164 * XXX: bind to an anycast address might accidentally 165 * cause sending a packet with anycast source address. 166 * We should allow to bind to a deprecated address, since 167 * the application dares to use it. 168 */ 169 if (ia && 170 ((struct in6_ifaddr *)ia)->ia6_flags & 171 (IN6_IFF_ANYCAST|IN6_IFF_NOTREADY|IN6_IFF_DETACHED)) { 172 return (EADDRNOTAVAIL); 173 } 174 } 175 if (lport) { 176 struct inpcb *t; 177 178 /* GROSS */ 179 if (ntohs(lport) <= ipport_reservedhigh && 180 ntohs(lport) >= ipport_reservedlow && 181 priv_check_cred(cred, PRIV_NETINET_RESERVEDPORT, 182 0)) 183 return (EACCES); 184 if (!IN6_IS_ADDR_MULTICAST(&sin6->sin6_addr) && 185 priv_check_cred(so->so_cred, 186 PRIV_NETINET_REUSEPORT, 0) != 0) { 187 t = in6_pcblookup_local(pcbinfo, 188 &sin6->sin6_addr, lport, 189 INPLOOKUP_WILDCARD); 190 if (t && 191 ((t->inp_vflag & INP_TIMEWAIT) == 0) && 192 (so->so_type != SOCK_STREAM || 193 IN6_IS_ADDR_UNSPECIFIED(&t->in6p_faddr)) && 194 (!IN6_IS_ADDR_UNSPECIFIED(&sin6->sin6_addr) || 195 !IN6_IS_ADDR_UNSPECIFIED(&t->in6p_laddr) || 196 (t->inp_socket->so_options & SO_REUSEPORT) 197 == 0) && (so->so_cred->cr_uid != 198 t->inp_socket->so_cred->cr_uid)) 199 return (EADDRINUSE); 200 if ((inp->inp_flags & IN6P_IPV6_V6ONLY) == 0 && 201 IN6_IS_ADDR_UNSPECIFIED(&sin6->sin6_addr)) { 202 struct sockaddr_in sin; 203 204 in6_sin6_2_sin(&sin, sin6); 205 t = in_pcblookup_local(pcbinfo, 206 sin.sin_addr, lport, 207 INPLOOKUP_WILDCARD); 208 if (t && 209 ((t->inp_vflag & 210 INP_TIMEWAIT) == 0) && 211 (so->so_type != SOCK_STREAM || 212 ntohl(t->inp_faddr.s_addr) == 213 INADDR_ANY) && 214 (so->so_cred->cr_uid != 215 t->inp_socket->so_cred->cr_uid)) 216 return (EADDRINUSE); 217 } 218 } 219 t = in6_pcblookup_local(pcbinfo, &sin6->sin6_addr, 220 lport, wild); 221 if (t && (reuseport & ((t->inp_vflag & INP_TIMEWAIT) ? 222 intotw(t)->tw_so_options : 223 t->inp_socket->so_options)) == 0) 224 return (EADDRINUSE); 225 if ((inp->inp_flags & IN6P_IPV6_V6ONLY) == 0 && 226 IN6_IS_ADDR_UNSPECIFIED(&sin6->sin6_addr)) { 227 struct sockaddr_in sin; 228 229 in6_sin6_2_sin(&sin, sin6); 230 t = in_pcblookup_local(pcbinfo, sin.sin_addr, 231 lport, wild); 232 if (t && t->inp_vflag & INP_TIMEWAIT) { 233 if ((reuseport & 234 intotw(t)->tw_so_options) == 0 && 235 (ntohl(t->inp_laddr.s_addr) != 236 INADDR_ANY || ((inp->inp_vflag & 237 INP_IPV6PROTO) == 238 (t->inp_vflag & INP_IPV6PROTO)))) 239 return (EADDRINUSE); 240 } 241 else if (t && 242 (reuseport & t->inp_socket->so_options) 243 == 0 && (ntohl(t->inp_laddr.s_addr) != 244 INADDR_ANY || INP_SOCKAF(so) == 245 INP_SOCKAF(t->inp_socket))) 246 return (EADDRINUSE); 247 } 248 } 249 inp->in6p_laddr = sin6->sin6_addr; 250 } 251 if (lport == 0) { 252 int e; 253 if ((e = in6_pcbsetport(&inp->in6p_laddr, inp, cred)) != 0) 254 return (e); 255 } 256 else { 257 inp->inp_lport = lport; 258 if (in_pcbinshash(inp) != 0) { 259 inp->in6p_laddr = in6addr_any; 260 inp->inp_lport = 0; 261 return (EAGAIN); 262 } 263 } 264 return (0); 265 } 266 267 /* 268 * Transform old in6_pcbconnect() into an inner subroutine for new 269 * in6_pcbconnect(): Do some validity-checking on the remote 270 * address (in mbuf 'nam') and then determine local host address 271 * (i.e., which interface) to use to access that remote host. 272 * 273 * This preserves definition of in6_pcbconnect(), while supporting a 274 * slightly different version for T/TCP. (This is more than 275 * a bit of a kludge, but cleaning up the internal interfaces would 276 * have forced minor changes in every protocol). 277 */ 278 int 279 in6_pcbladdr(register struct inpcb *inp, struct sockaddr *nam, 280 struct in6_addr **plocal_addr6) 281 { 282 register struct sockaddr_in6 *sin6 = (struct sockaddr_in6 *)nam; 283 int error = 0; 284 struct ifnet *ifp = NULL; 285 int scope_ambiguous = 0; 286 287 INP_INFO_WLOCK_ASSERT(inp->inp_pcbinfo); 288 INP_LOCK_ASSERT(inp); 289 290 if (nam->sa_len != sizeof (*sin6)) 291 return (EINVAL); 292 if (sin6->sin6_family != AF_INET6) 293 return (EAFNOSUPPORT); 294 if (sin6->sin6_port == 0) 295 return (EADDRNOTAVAIL); 296 297 if (sin6->sin6_scope_id == 0 && !ip6_use_defzone) 298 scope_ambiguous = 1; 299 if ((error = sa6_embedscope(sin6, ip6_use_defzone)) != 0) 300 return(error); 301 302 if (in6_ifaddr) { 303 /* 304 * If the destination address is UNSPECIFIED addr, 305 * use the loopback addr, e.g ::1. 306 */ 307 if (IN6_IS_ADDR_UNSPECIFIED(&sin6->sin6_addr)) 308 sin6->sin6_addr = in6addr_loopback; 309 } 310 311 /* 312 * XXX: in6_selectsrc might replace the bound local address 313 * with the address specified by setsockopt(IPV6_PKTINFO). 314 * Is it the intended behavior? 315 */ 316 *plocal_addr6 = in6_selectsrc(sin6, inp->in6p_outputopts, 317 inp->in6p_moptions, NULL, 318 &inp->in6p_laddr, &ifp, &error); 319 if (ifp && scope_ambiguous && 320 (error = in6_setscope(&sin6->sin6_addr, ifp, NULL)) != 0) { 321 return(error); 322 } 323 324 if (*plocal_addr6 == 0) { 325 if (error == 0) 326 error = EADDRNOTAVAIL; 327 return (error); 328 } 329 /* 330 * Don't do pcblookup call here; return interface in 331 * plocal_addr6 332 * and exit to caller, that will do the lookup. 333 */ 334 335 return (0); 336 } 337 338 /* 339 * Outer subroutine: 340 * Connect from a socket to a specified address. 341 * Both address and port must be specified in argument sin. 342 * If don't have a local address for this socket yet, 343 * then pick one. 344 */ 345 int 346 in6_pcbconnect(register struct inpcb *inp, struct sockaddr *nam, 347 struct ucred *cred) 348 { 349 struct in6_addr *addr6; 350 register struct sockaddr_in6 *sin6 = (struct sockaddr_in6 *)nam; 351 int error; 352 353 INP_INFO_WLOCK_ASSERT(inp->inp_pcbinfo); 354 INP_LOCK_ASSERT(inp); 355 356 /* 357 * Call inner routine, to assign local interface address. 358 * in6_pcbladdr() may automatically fill in sin6_scope_id. 359 */ 360 if ((error = in6_pcbladdr(inp, nam, &addr6)) != 0) 361 return (error); 362 363 if (in6_pcblookup_hash(inp->inp_pcbinfo, &sin6->sin6_addr, 364 sin6->sin6_port, 365 IN6_IS_ADDR_UNSPECIFIED(&inp->in6p_laddr) 366 ? addr6 : &inp->in6p_laddr, 367 inp->inp_lport, 0, NULL) != NULL) { 368 return (EADDRINUSE); 369 } 370 if (IN6_IS_ADDR_UNSPECIFIED(&inp->in6p_laddr)) { 371 if (inp->inp_lport == 0) { 372 error = in6_pcbbind(inp, (struct sockaddr *)0, cred); 373 if (error) 374 return (error); 375 } 376 inp->in6p_laddr = *addr6; 377 } 378 inp->in6p_faddr = sin6->sin6_addr; 379 inp->inp_fport = sin6->sin6_port; 380 /* update flowinfo - draft-itojun-ipv6-flowlabel-api-00 */ 381 inp->in6p_flowinfo &= ~IPV6_FLOWLABEL_MASK; 382 if (inp->in6p_flags & IN6P_AUTOFLOWLABEL) 383 inp->in6p_flowinfo |= 384 (htonl(ip6_randomflowlabel()) & IPV6_FLOWLABEL_MASK); 385 386 in_pcbrehash(inp); 387 388 return (0); 389 } 390 391 void 392 in6_pcbdisconnect(struct inpcb *inp) 393 { 394 395 INP_INFO_WLOCK_ASSERT(inp->inp_pcbinfo); 396 INP_LOCK_ASSERT(inp); 397 398 bzero((caddr_t)&inp->in6p_faddr, sizeof(inp->in6p_faddr)); 399 inp->inp_fport = 0; 400 /* clear flowinfo - draft-itojun-ipv6-flowlabel-api-00 */ 401 inp->in6p_flowinfo &= ~IPV6_FLOWLABEL_MASK; 402 in_pcbrehash(inp); 403 } 404 405 void 406 in6_pcbdetach(struct inpcb *inp) 407 { 408 409 KASSERT(inp->inp_socket != NULL, ("in6_pcbdetach: inp_socket == NULL")); 410 inp->inp_socket->so_pcb = NULL; 411 inp->inp_socket = NULL; 412 } 413 414 void 415 in6_pcbfree(struct inpcb *inp) 416 { 417 struct inpcbinfo *ipi = inp->inp_pcbinfo; 418 419 KASSERT(inp->inp_socket == NULL, ("in6_pcbfree: inp_socket != NULL")); 420 INP_INFO_WLOCK_ASSERT(inp->inp_pcbinfo); 421 INP_LOCK_ASSERT(inp); 422 423 #ifdef IPSEC 424 if (inp->in6p_sp != NULL) 425 ipsec6_delete_pcbpolicy(inp); 426 #endif /* IPSEC */ 427 inp->inp_gencnt = ++ipi->ipi_gencnt; 428 in_pcbremlists(inp); 429 ip6_freepcbopts(inp->in6p_outputopts); 430 ip6_freemoptions(inp->in6p_moptions); 431 /* Check and free IPv4 related resources in case of mapped addr */ 432 if (inp->inp_options) 433 (void)m_free(inp->inp_options); 434 if (inp->inp_moptions != NULL) 435 inp_freemoptions(inp->inp_moptions); 436 inp->inp_vflag = 0; 437 INP_UNLOCK(inp); 438 uma_zfree(ipi->ipi_zone, inp); 439 } 440 441 struct sockaddr * 442 in6_sockaddr(in_port_t port, struct in6_addr *addr_p) 443 { 444 struct sockaddr_in6 *sin6; 445 446 MALLOC(sin6, struct sockaddr_in6 *, sizeof *sin6, M_SONAME, M_WAITOK); 447 bzero(sin6, sizeof *sin6); 448 sin6->sin6_family = AF_INET6; 449 sin6->sin6_len = sizeof(*sin6); 450 sin6->sin6_port = port; 451 sin6->sin6_addr = *addr_p; 452 (void)sa6_recoverscope(sin6); /* XXX: should catch errors */ 453 454 return (struct sockaddr *)sin6; 455 } 456 457 struct sockaddr * 458 in6_v4mapsin6_sockaddr(in_port_t port, struct in_addr *addr_p) 459 { 460 struct sockaddr_in sin; 461 struct sockaddr_in6 *sin6_p; 462 463 bzero(&sin, sizeof sin); 464 sin.sin_family = AF_INET; 465 sin.sin_len = sizeof(sin); 466 sin.sin_port = port; 467 sin.sin_addr = *addr_p; 468 469 MALLOC(sin6_p, struct sockaddr_in6 *, sizeof *sin6_p, M_SONAME, 470 M_WAITOK); 471 in6_sin_2_v4mapsin6(&sin, sin6_p); 472 473 return (struct sockaddr *)sin6_p; 474 } 475 476 int 477 in6_getsockaddr(struct socket *so, struct sockaddr **nam) 478 { 479 register struct inpcb *inp; 480 struct in6_addr addr; 481 in_port_t port; 482 483 inp = sotoinpcb(so); 484 KASSERT(inp != NULL, ("in6_getsockaddr: inp == NULL")); 485 486 INP_LOCK(inp); 487 port = inp->inp_lport; 488 addr = inp->in6p_laddr; 489 INP_UNLOCK(inp); 490 491 *nam = in6_sockaddr(port, &addr); 492 return 0; 493 } 494 495 int 496 in6_getpeeraddr(struct socket *so, struct sockaddr **nam) 497 { 498 struct inpcb *inp; 499 struct in6_addr addr; 500 in_port_t port; 501 502 inp = sotoinpcb(so); 503 KASSERT(inp != NULL, ("in6_getpeeraddr: inp == NULL")); 504 505 INP_LOCK(inp); 506 port = inp->inp_fport; 507 addr = inp->in6p_faddr; 508 INP_UNLOCK(inp); 509 510 *nam = in6_sockaddr(port, &addr); 511 return 0; 512 } 513 514 int 515 in6_mapped_sockaddr(struct socket *so, struct sockaddr **nam) 516 { 517 struct inpcb *inp; 518 int error; 519 520 inp = sotoinpcb(so); 521 KASSERT(inp != NULL, ("in6_mapped_sockaddr: inp == NULL")); 522 523 if ((inp->inp_vflag & (INP_IPV4 | INP_IPV6)) == INP_IPV4) { 524 error = in_getsockaddr(so, nam); 525 if (error == 0) 526 in6_sin_2_v4mapsin6_in_sock(nam); 527 } else { 528 /* scope issues will be handled in in6_getsockaddr(). */ 529 error = in6_getsockaddr(so, nam); 530 } 531 532 return error; 533 } 534 535 int 536 in6_mapped_peeraddr(struct socket *so, struct sockaddr **nam) 537 { 538 struct inpcb *inp; 539 int error; 540 541 inp = sotoinpcb(so); 542 KASSERT(inp != NULL, ("in6_mapped_peeraddr: inp == NULL")); 543 544 if ((inp->inp_vflag & (INP_IPV4 | INP_IPV6)) == INP_IPV4) { 545 error = in_getpeeraddr(so, nam); 546 if (error == 0) 547 in6_sin_2_v4mapsin6_in_sock(nam); 548 } else 549 /* scope issues will be handled in in6_getpeeraddr(). */ 550 error = in6_getpeeraddr(so, nam); 551 552 return error; 553 } 554 555 /* 556 * Pass some notification to all connections of a protocol 557 * associated with address dst. The local address and/or port numbers 558 * may be specified to limit the search. The "usual action" will be 559 * taken, depending on the ctlinput cmd. The caller must filter any 560 * cmds that are uninteresting (e.g., no error in the map). 561 * Call the protocol specific routine (if any) to report 562 * any errors for each matching socket. 563 */ 564 void 565 in6_pcbnotify(struct inpcbinfo *pcbinfo, struct sockaddr *dst, 566 u_int fport_arg, const struct sockaddr *src, u_int lport_arg, 567 int cmd, void *cmdarg, 568 struct inpcb *(*notify) __P((struct inpcb *, int))) 569 { 570 struct inpcbhead *head; 571 struct inpcb *inp, *ninp; 572 struct sockaddr_in6 sa6_src, *sa6_dst; 573 u_short fport = fport_arg, lport = lport_arg; 574 u_int32_t flowinfo; 575 int errno; 576 577 if ((unsigned)cmd >= PRC_NCMDS || dst->sa_family != AF_INET6) 578 return; 579 580 sa6_dst = (struct sockaddr_in6 *)dst; 581 if (IN6_IS_ADDR_UNSPECIFIED(&sa6_dst->sin6_addr)) 582 return; 583 584 /* 585 * note that src can be NULL when we get notify by local fragmentation. 586 */ 587 sa6_src = (src == NULL) ? sa6_any : *(const struct sockaddr_in6 *)src; 588 flowinfo = sa6_src.sin6_flowinfo; 589 590 /* 591 * Redirects go to all references to the destination, 592 * and use in6_rtchange to invalidate the route cache. 593 * Dead host indications: also use in6_rtchange to invalidate 594 * the cache, and deliver the error to all the sockets. 595 * Otherwise, if we have knowledge of the local port and address, 596 * deliver only to that socket. 597 */ 598 if (PRC_IS_REDIRECT(cmd) || cmd == PRC_HOSTDEAD) { 599 fport = 0; 600 lport = 0; 601 bzero((caddr_t)&sa6_src.sin6_addr, sizeof(sa6_src.sin6_addr)); 602 603 if (cmd != PRC_HOSTDEAD) 604 notify = in6_rtchange; 605 } 606 errno = inet6ctlerrmap[cmd]; 607 head = pcbinfo->ipi_listhead; 608 INP_INFO_WLOCK(pcbinfo); 609 for (inp = LIST_FIRST(head); inp != NULL; inp = ninp) { 610 INP_LOCK(inp); 611 ninp = LIST_NEXT(inp, inp_list); 612 613 if ((inp->inp_vflag & INP_IPV6) == 0) { 614 INP_UNLOCK(inp); 615 continue; 616 } 617 618 /* 619 * If the error designates a new path MTU for a destination 620 * and the application (associated with this socket) wanted to 621 * know the value, notify. Note that we notify for all 622 * disconnected sockets if the corresponding application 623 * wanted. This is because some UDP applications keep sending 624 * sockets disconnected. 625 * XXX: should we avoid to notify the value to TCP sockets? 626 */ 627 if (cmd == PRC_MSGSIZE && (inp->inp_flags & IN6P_MTU) != 0 && 628 (IN6_IS_ADDR_UNSPECIFIED(&inp->in6p_faddr) || 629 IN6_ARE_ADDR_EQUAL(&inp->in6p_faddr, &sa6_dst->sin6_addr))) { 630 ip6_notify_pmtu(inp, (struct sockaddr_in6 *)dst, 631 (u_int32_t *)cmdarg); 632 } 633 634 /* 635 * Detect if we should notify the error. If no source and 636 * destination ports are specifed, but non-zero flowinfo and 637 * local address match, notify the error. This is the case 638 * when the error is delivered with an encrypted buffer 639 * by ESP. Otherwise, just compare addresses and ports 640 * as usual. 641 */ 642 if (lport == 0 && fport == 0 && flowinfo && 643 inp->inp_socket != NULL && 644 flowinfo == (inp->in6p_flowinfo & IPV6_FLOWLABEL_MASK) && 645 IN6_ARE_ADDR_EQUAL(&inp->in6p_laddr, &sa6_src.sin6_addr)) 646 goto do_notify; 647 else if (!IN6_ARE_ADDR_EQUAL(&inp->in6p_faddr, 648 &sa6_dst->sin6_addr) || 649 inp->inp_socket == 0 || 650 (lport && inp->inp_lport != lport) || 651 (!IN6_IS_ADDR_UNSPECIFIED(&sa6_src.sin6_addr) && 652 !IN6_ARE_ADDR_EQUAL(&inp->in6p_laddr, 653 &sa6_src.sin6_addr)) || 654 (fport && inp->inp_fport != fport)) { 655 INP_UNLOCK(inp); 656 continue; 657 } 658 659 do_notify: 660 if (notify) { 661 if ((*notify)(inp, errno)) 662 INP_UNLOCK(inp); 663 } else 664 INP_UNLOCK(inp); 665 } 666 INP_INFO_WUNLOCK(pcbinfo); 667 } 668 669 /* 670 * Lookup a PCB based on the local address and port. 671 */ 672 struct inpcb * 673 in6_pcblookup_local(struct inpcbinfo *pcbinfo, struct in6_addr *laddr, 674 u_int lport_arg, int wild_okay) 675 { 676 register struct inpcb *inp; 677 int matchwild = 3, wildcard; 678 u_short lport = lport_arg; 679 680 INP_INFO_WLOCK_ASSERT(pcbinfo); 681 682 if (!wild_okay) { 683 struct inpcbhead *head; 684 /* 685 * Look for an unconnected (wildcard foreign addr) PCB that 686 * matches the local address and port we're looking for. 687 */ 688 head = &pcbinfo->ipi_hashbase[INP_PCBHASH(INADDR_ANY, lport, 689 0, pcbinfo->ipi_hashmask)]; 690 LIST_FOREACH(inp, head, inp_hash) { 691 if ((inp->inp_vflag & INP_IPV6) == 0) 692 continue; 693 if (IN6_IS_ADDR_UNSPECIFIED(&inp->in6p_faddr) && 694 IN6_ARE_ADDR_EQUAL(&inp->in6p_laddr, laddr) && 695 inp->inp_lport == lport) { 696 /* 697 * Found. 698 */ 699 return (inp); 700 } 701 } 702 /* 703 * Not found. 704 */ 705 return (NULL); 706 } else { 707 struct inpcbporthead *porthash; 708 struct inpcbport *phd; 709 struct inpcb *match = NULL; 710 /* 711 * Best fit PCB lookup. 712 * 713 * First see if this local port is in use by looking on the 714 * port hash list. 715 */ 716 porthash = &pcbinfo->ipi_porthashbase[INP_PCBPORTHASH(lport, 717 pcbinfo->ipi_porthashmask)]; 718 LIST_FOREACH(phd, porthash, phd_hash) { 719 if (phd->phd_port == lport) 720 break; 721 } 722 if (phd != NULL) { 723 /* 724 * Port is in use by one or more PCBs. Look for best 725 * fit. 726 */ 727 LIST_FOREACH(inp, &phd->phd_pcblist, inp_portlist) { 728 wildcard = 0; 729 if ((inp->inp_vflag & INP_IPV6) == 0) 730 continue; 731 if (!IN6_IS_ADDR_UNSPECIFIED(&inp->in6p_faddr)) 732 wildcard++; 733 if (!IN6_IS_ADDR_UNSPECIFIED( 734 &inp->in6p_laddr)) { 735 if (IN6_IS_ADDR_UNSPECIFIED(laddr)) 736 wildcard++; 737 else if (!IN6_ARE_ADDR_EQUAL( 738 &inp->in6p_laddr, laddr)) 739 continue; 740 } else { 741 if (!IN6_IS_ADDR_UNSPECIFIED(laddr)) 742 wildcard++; 743 } 744 if (wildcard < matchwild) { 745 match = inp; 746 matchwild = wildcard; 747 if (matchwild == 0) { 748 break; 749 } 750 } 751 } 752 } 753 return (match); 754 } 755 } 756 757 void 758 in6_pcbpurgeif0(struct inpcbinfo *pcbinfo, struct ifnet *ifp) 759 { 760 struct in6pcb *in6p; 761 struct ip6_moptions *im6o; 762 struct in6_multi_mship *imm, *nimm; 763 764 INP_INFO_RLOCK(pcbinfo); 765 LIST_FOREACH(in6p, pcbinfo->ipi_listhead, inp_list) { 766 INP_LOCK(in6p); 767 im6o = in6p->in6p_moptions; 768 if ((in6p->inp_vflag & INP_IPV6) && 769 im6o) { 770 /* 771 * Unselect the outgoing interface if it is being 772 * detached. 773 */ 774 if (im6o->im6o_multicast_ifp == ifp) 775 im6o->im6o_multicast_ifp = NULL; 776 777 /* 778 * Drop multicast group membership if we joined 779 * through the interface being detached. 780 * XXX controversial - is it really legal for kernel 781 * to force this? 782 */ 783 for (imm = im6o->im6o_memberships.lh_first; 784 imm != NULL; imm = nimm) { 785 nimm = imm->i6mm_chain.le_next; 786 if (imm->i6mm_maddr->in6m_ifp == ifp) { 787 LIST_REMOVE(imm, i6mm_chain); 788 in6_delmulti(imm->i6mm_maddr); 789 free(imm, M_IP6MADDR); 790 } 791 } 792 } 793 INP_UNLOCK(in6p); 794 } 795 INP_INFO_RUNLOCK(pcbinfo); 796 } 797 798 /* 799 * Check for alternatives when higher level complains 800 * about service problems. For now, invalidate cached 801 * routing information. If the route was created dynamically 802 * (by a redirect), time to try a default gateway again. 803 */ 804 void 805 in6_losing(struct inpcb *in6p) 806 { 807 808 /* 809 * We don't store route pointers in the routing table anymore 810 */ 811 return; 812 } 813 814 /* 815 * After a routing change, flush old routing 816 * and allocate a (hopefully) better one. 817 */ 818 struct inpcb * 819 in6_rtchange(struct inpcb *inp, int errno) 820 { 821 /* 822 * We don't store route pointers in the routing table anymore 823 */ 824 return inp; 825 } 826 827 /* 828 * Lookup PCB in hash list. 829 */ 830 struct inpcb * 831 in6_pcblookup_hash(struct inpcbinfo *pcbinfo, struct in6_addr *faddr, 832 u_int fport_arg, struct in6_addr *laddr, u_int lport_arg, 833 int wildcard, struct ifnet *ifp) 834 { 835 struct inpcbhead *head; 836 register struct inpcb *inp; 837 u_short fport = fport_arg, lport = lport_arg; 838 int faith; 839 840 INP_INFO_RLOCK_ASSERT(pcbinfo); 841 842 if (faithprefix_p != NULL) 843 faith = (*faithprefix_p)(laddr); 844 else 845 faith = 0; 846 847 /* 848 * First look for an exact match. 849 */ 850 head = &pcbinfo->ipi_hashbase[ 851 INP_PCBHASH(faddr->s6_addr32[3] /* XXX */, lport, fport, 852 pcbinfo->ipi_hashmask)]; 853 LIST_FOREACH(inp, head, inp_hash) { 854 if ((inp->inp_vflag & INP_IPV6) == 0) 855 continue; 856 if (IN6_ARE_ADDR_EQUAL(&inp->in6p_faddr, faddr) && 857 IN6_ARE_ADDR_EQUAL(&inp->in6p_laddr, laddr) && 858 inp->inp_fport == fport && 859 inp->inp_lport == lport) { 860 /* 861 * Found. 862 */ 863 return (inp); 864 } 865 } 866 if (wildcard) { 867 struct inpcb *local_wild = NULL; 868 869 head = &pcbinfo->ipi_hashbase[INP_PCBHASH(INADDR_ANY, lport, 870 0, pcbinfo->ipi_hashmask)]; 871 LIST_FOREACH(inp, head, inp_hash) { 872 if ((inp->inp_vflag & INP_IPV6) == 0) 873 continue; 874 if (IN6_IS_ADDR_UNSPECIFIED(&inp->in6p_faddr) && 875 inp->inp_lport == lport) { 876 if (faith && (inp->inp_flags & INP_FAITH) == 0) 877 continue; 878 if (IN6_ARE_ADDR_EQUAL(&inp->in6p_laddr, 879 laddr)) 880 return (inp); 881 else if (IN6_IS_ADDR_UNSPECIFIED(&inp->in6p_laddr)) 882 local_wild = inp; 883 } 884 } 885 return (local_wild); 886 } 887 888 /* 889 * Not found. 890 */ 891 return (NULL); 892 } 893 894 void 895 init_sin6(struct sockaddr_in6 *sin6, struct mbuf *m) 896 { 897 struct ip6_hdr *ip; 898 899 ip = mtod(m, struct ip6_hdr *); 900 bzero(sin6, sizeof(*sin6)); 901 sin6->sin6_len = sizeof(*sin6); 902 sin6->sin6_family = AF_INET6; 903 sin6->sin6_addr = ip->ip6_src; 904 905 (void)sa6_recoverscope(sin6); /* XXX: should catch errors... */ 906 907 return; 908 } 909