Now available: The Design and Implementation of the FreeBSD Operating System (Second Edition)
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sys/netinet6/in6_pcb.c
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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 #include "opt_mac.h" 70 71 #include <sys/param.h> 72 #include <sys/systm.h> 73 #include <sys/malloc.h> 74 #include <sys/mbuf.h> 75 #include <sys/domain.h> 76 #include <sys/protosw.h> 77 #include <sys/socket.h> 78 #include <sys/socketvar.h> 79 #include <sys/sockio.h> 80 #include <sys/errno.h> 81 #include <sys/time.h> 82 #include <sys/priv.h> 83 #include <sys/proc.h> 84 #include <sys/jail.h> 85 86 #include <vm/uma.h> 87 88 #include <net/if.h> 89 #include <net/if_types.h> 90 #include <net/route.h> 91 92 #include <netinet/in.h> 93 #include <netinet/in_var.h> 94 #include <netinet/in_systm.h> 95 #include <netinet/tcp_var.h> 96 #include <netinet/ip6.h> 97 #include <netinet/ip_var.h> 98 #include <netinet6/ip6_var.h> 99 #include <netinet6/nd6.h> 100 #include <netinet/in_pcb.h> 101 #include <netinet6/in6_pcb.h> 102 #include <netinet6/scope6_var.h> 103 104 #ifdef IPSEC 105 #include <netipsec/ipsec.h> 106 #include <netipsec/ipsec6.h> 107 #include <netipsec/key.h> 108 #endif /* IPSEC */ 109 110 #include <security/mac/mac_framework.h> 111 112 struct in6_addr zeroin6_addr; 113 114 int 115 in6_pcbbind(register struct inpcb *inp, struct sockaddr *nam, 116 struct ucred *cred) 117 { 118 struct socket *so = inp->inp_socket; 119 struct sockaddr_in6 *sin6 = (struct sockaddr_in6 *)NULL; 120 struct inpcbinfo *pcbinfo = inp->inp_pcbinfo; 121 u_short lport = 0; 122 int wild = 0, reuseport = (so->so_options & SO_REUSEPORT); 123 124 INP_INFO_WLOCK_ASSERT(pcbinfo); 125 INP_WLOCK_ASSERT(inp); 126 127 if (!in6_ifaddr) /* XXX broken! */ 128 return (EADDRNOTAVAIL); 129 if (inp->inp_lport || !IN6_IS_ADDR_UNSPECIFIED(&inp->in6p_laddr)) 130 return (EINVAL); 131 if ((so->so_options & (SO_REUSEADDR|SO_REUSEPORT)) == 0) 132 wild = INPLOOKUP_WILDCARD; 133 if (nam) { 134 int error; 135 136 sin6 = (struct sockaddr_in6 *)nam; 137 if (nam->sa_len != sizeof(*sin6)) 138 return (EINVAL); 139 /* 140 * family check. 141 */ 142 if (nam->sa_family != AF_INET6) 143 return (EAFNOSUPPORT); 144 145 if ((error = sa6_embedscope(sin6, ip6_use_defzone)) != 0) 146 return(error); 147 148 lport = sin6->sin6_port; 149 if (IN6_IS_ADDR_MULTICAST(&sin6->sin6_addr)) { 150 /* 151 * Treat SO_REUSEADDR as SO_REUSEPORT for multicast; 152 * allow compepte duplication of binding if 153 * SO_REUSEPORT is set, or if SO_REUSEADDR is set 154 * and a multicast address is bound on both 155 * new and duplicated sockets. 156 */ 157 if (so->so_options & SO_REUSEADDR) 158 reuseport = SO_REUSEADDR|SO_REUSEPORT; 159 } else if (!IN6_IS_ADDR_UNSPECIFIED(&sin6->sin6_addr)) { 160 struct ifaddr *ia = NULL; 161 162 sin6->sin6_port = 0; /* yech... */ 163 if ((ia = ifa_ifwithaddr((struct sockaddr *)sin6)) == 0) 164 return (EADDRNOTAVAIL); 165 166 /* 167 * XXX: bind to an anycast address might accidentally 168 * cause sending a packet with anycast source address. 169 * We should allow to bind to a deprecated address, since 170 * the application dares to use it. 171 */ 172 if (ia && 173 ((struct in6_ifaddr *)ia)->ia6_flags & 174 (IN6_IFF_ANYCAST|IN6_IFF_NOTREADY|IN6_IFF_DETACHED)) { 175 return (EADDRNOTAVAIL); 176 } 177 } 178 if (lport) { 179 struct inpcb *t; 180 181 /* GROSS */ 182 if (ntohs(lport) <= ipport_reservedhigh && 183 ntohs(lport) >= ipport_reservedlow && 184 priv_check_cred(cred, PRIV_NETINET_RESERVEDPORT, 185 0)) 186 return (EACCES); 187 if (!IN6_IS_ADDR_MULTICAST(&sin6->sin6_addr) && 188 priv_check_cred(inp->inp_cred, 189 PRIV_NETINET_REUSEPORT, 0) != 0) { 190 t = in6_pcblookup_local(pcbinfo, 191 &sin6->sin6_addr, lport, 192 INPLOOKUP_WILDCARD, cred); 193 if (t && 194 ((t->inp_vflag & INP_TIMEWAIT) == 0) && 195 (so->so_type != SOCK_STREAM || 196 IN6_IS_ADDR_UNSPECIFIED(&t->in6p_faddr)) && 197 (!IN6_IS_ADDR_UNSPECIFIED(&sin6->sin6_addr) || 198 !IN6_IS_ADDR_UNSPECIFIED(&t->in6p_laddr) || 199 (t->inp_socket->so_options & SO_REUSEPORT) 200 == 0) && (inp->inp_cred->cr_uid != 201 t->inp_cred->cr_uid)) 202 return (EADDRINUSE); 203 if ((inp->inp_flags & IN6P_IPV6_V6ONLY) == 0 && 204 IN6_IS_ADDR_UNSPECIFIED(&sin6->sin6_addr)) { 205 struct sockaddr_in sin; 206 207 in6_sin6_2_sin(&sin, sin6); 208 t = in_pcblookup_local(pcbinfo, 209 sin.sin_addr, lport, 210 INPLOOKUP_WILDCARD, cred); 211 if (t && 212 ((t->inp_vflag & 213 INP_TIMEWAIT) == 0) && 214 (so->so_type != SOCK_STREAM || 215 ntohl(t->inp_faddr.s_addr) == 216 INADDR_ANY) && 217 (inp->inp_cred->cr_uid != 218 t->inp_cred->cr_uid)) 219 return (EADDRINUSE); 220 } 221 } 222 t = in6_pcblookup_local(pcbinfo, &sin6->sin6_addr, 223 lport, wild, cred); 224 if (t && (reuseport & ((t->inp_vflag & INP_TIMEWAIT) ? 225 intotw(t)->tw_so_options : 226 t->inp_socket->so_options)) == 0) 227 return (EADDRINUSE); 228 if ((inp->inp_flags & IN6P_IPV6_V6ONLY) == 0 && 229 IN6_IS_ADDR_UNSPECIFIED(&sin6->sin6_addr)) { 230 struct sockaddr_in sin; 231 232 in6_sin6_2_sin(&sin, sin6); 233 t = in_pcblookup_local(pcbinfo, sin.sin_addr, 234 lport, wild, cred); 235 if (t && t->inp_vflag & INP_TIMEWAIT) { 236 if ((reuseport & 237 intotw(t)->tw_so_options) == 0 && 238 (ntohl(t->inp_laddr.s_addr) != 239 INADDR_ANY || ((inp->inp_vflag & 240 INP_IPV6PROTO) == 241 (t->inp_vflag & INP_IPV6PROTO)))) 242 return (EADDRINUSE); 243 } 244 else if (t && 245 (reuseport & t->inp_socket->so_options) 246 == 0 && (ntohl(t->inp_laddr.s_addr) != 247 INADDR_ANY || INP_SOCKAF(so) == 248 INP_SOCKAF(t->inp_socket))) 249 return (EADDRINUSE); 250 } 251 } 252 inp->in6p_laddr = sin6->sin6_addr; 253 } 254 if (lport == 0) { 255 int e; 256 if ((e = in6_pcbsetport(&inp->in6p_laddr, inp, cred)) != 0) 257 return (e); 258 } else { 259 inp->inp_lport = lport; 260 if (in_pcbinshash(inp) != 0) { 261 inp->in6p_laddr = in6addr_any; 262 inp->inp_lport = 0; 263 return (EAGAIN); 264 } 265 } 266 return (0); 267 } 268 269 /* 270 * Transform old in6_pcbconnect() into an inner subroutine for new 271 * in6_pcbconnect(): Do some validity-checking on the remote 272 * address (in mbuf 'nam') and then determine local host address 273 * (i.e., which interface) to use to access that remote host. 274 * 275 * This preserves definition of in6_pcbconnect(), while supporting a 276 * slightly different version for T/TCP. (This is more than 277 * a bit of a kludge, but cleaning up the internal interfaces would 278 * have forced minor changes in every protocol). 279 */ 280 int 281 in6_pcbladdr(register struct inpcb *inp, struct sockaddr *nam, 282 struct in6_addr **plocal_addr6) 283 { 284 register struct sockaddr_in6 *sin6 = (struct sockaddr_in6 *)nam; 285 int error = 0; 286 struct ifnet *ifp = NULL; 287 int scope_ambiguous = 0; 288 289 INP_INFO_WLOCK_ASSERT(inp->inp_pcbinfo); 290 INP_WLOCK_ASSERT(inp); 291 292 if (nam->sa_len != sizeof (*sin6)) 293 return (EINVAL); 294 if (sin6->sin6_family != AF_INET6) 295 return (EAFNOSUPPORT); 296 if (sin6->sin6_port == 0) 297 return (EADDRNOTAVAIL); 298 299 if (sin6->sin6_scope_id == 0 && !ip6_use_defzone) 300 scope_ambiguous = 1; 301 if ((error = sa6_embedscope(sin6, ip6_use_defzone)) != 0) 302 return(error); 303 304 if (in6_ifaddr) { 305 /* 306 * If the destination address is UNSPECIFIED addr, 307 * use the loopback addr, e.g ::1. 308 */ 309 if (IN6_IS_ADDR_UNSPECIFIED(&sin6->sin6_addr)) 310 sin6->sin6_addr = in6addr_loopback; 311 } 312 313 /* 314 * XXX: in6_selectsrc might replace the bound local address 315 * with the address specified by setsockopt(IPV6_PKTINFO). 316 * Is it the intended behavior? 317 */ 318 *plocal_addr6 = in6_selectsrc(sin6, inp->in6p_outputopts, 319 inp, NULL, 320 inp->inp_cred, 321 &ifp, &error); 322 if (ifp && scope_ambiguous && 323 (error = in6_setscope(&sin6->sin6_addr, ifp, NULL)) != 0) { 324 return(error); 325 } 326 327 if (*plocal_addr6 == NULL) { 328 if (error == 0) 329 error = EADDRNOTAVAIL; 330 return (error); 331 } 332 /* 333 * Don't do pcblookup call here; return interface in 334 * plocal_addr6 335 * and exit to caller, that will do the lookup. 336 */ 337 338 return (0); 339 } 340 341 /* 342 * Outer subroutine: 343 * Connect from a socket to a specified address. 344 * Both address and port must be specified in argument sin. 345 * If don't have a local address for this socket yet, 346 * then pick one. 347 */ 348 int 349 in6_pcbconnect(register struct inpcb *inp, struct sockaddr *nam, 350 struct ucred *cred) 351 { 352 struct in6_addr *addr6; 353 register struct sockaddr_in6 *sin6 = (struct sockaddr_in6 *)nam; 354 int error; 355 356 INP_INFO_WLOCK_ASSERT(inp->inp_pcbinfo); 357 INP_WLOCK_ASSERT(inp); 358 359 /* 360 * Call inner routine, to assign local interface address. 361 * in6_pcbladdr() may automatically fill in sin6_scope_id. 362 */ 363 if ((error = in6_pcbladdr(inp, nam, &addr6)) != 0) 364 return (error); 365 366 if (in6_pcblookup_hash(inp->inp_pcbinfo, &sin6->sin6_addr, 367 sin6->sin6_port, 368 IN6_IS_ADDR_UNSPECIFIED(&inp->in6p_laddr) 369 ? addr6 : &inp->in6p_laddr, 370 inp->inp_lport, 0, NULL) != NULL) { 371 return (EADDRINUSE); 372 } 373 if (IN6_IS_ADDR_UNSPECIFIED(&inp->in6p_laddr)) { 374 if (inp->inp_lport == 0) { 375 error = in6_pcbbind(inp, (struct sockaddr *)0, cred); 376 if (error) 377 return (error); 378 } 379 inp->in6p_laddr = *addr6; 380 } 381 inp->in6p_faddr = sin6->sin6_addr; 382 inp->inp_fport = sin6->sin6_port; 383 /* update flowinfo - draft-itojun-ipv6-flowlabel-api-00 */ 384 inp->in6p_flowinfo &= ~IPV6_FLOWLABEL_MASK; 385 if (inp->in6p_flags & IN6P_AUTOFLOWLABEL) 386 inp->in6p_flowinfo |= 387 (htonl(ip6_randomflowlabel()) & IPV6_FLOWLABEL_MASK); 388 389 in_pcbrehash(inp); 390 391 return (0); 392 } 393 394 void 395 in6_pcbdisconnect(struct inpcb *inp) 396 { 397 398 INP_INFO_WLOCK_ASSERT(inp->inp_pcbinfo); 399 INP_WLOCK_ASSERT(inp); 400 401 bzero((caddr_t)&inp->in6p_faddr, sizeof(inp->in6p_faddr)); 402 inp->inp_fport = 0; 403 /* clear flowinfo - draft-itojun-ipv6-flowlabel-api-00 */ 404 inp->in6p_flowinfo &= ~IPV6_FLOWLABEL_MASK; 405 in_pcbrehash(inp); 406 } 407 408 void 409 in6_pcbdetach(struct inpcb *inp) 410 { 411 412 KASSERT(inp->inp_socket != NULL, ("in6_pcbdetach: inp_socket == NULL")); 413 inp->inp_socket->so_pcb = NULL; 414 inp->inp_socket = NULL; 415 } 416 417 void 418 in6_pcbfree(struct inpcb *inp) 419 { 420 struct inpcbinfo *ipi = inp->inp_pcbinfo; 421 422 KASSERT(inp->inp_socket == NULL, ("in6_pcbfree: inp_socket != NULL")); 423 INP_INFO_WLOCK_ASSERT(inp->inp_pcbinfo); 424 INP_WLOCK_ASSERT(inp); 425 426 #ifdef IPSEC 427 if (inp->in6p_sp != NULL) 428 ipsec6_delete_pcbpolicy(inp); 429 #endif /* IPSEC */ 430 inp->inp_gencnt = ++ipi->ipi_gencnt; 431 in_pcbremlists(inp); 432 ip6_freepcbopts(inp->in6p_outputopts); 433 ip6_freemoptions(inp->in6p_moptions); 434 /* Check and free IPv4 related resources in case of mapped addr */ 435 if (inp->inp_options) 436 (void)m_free(inp->inp_options); 437 if (inp->inp_moptions != NULL) 438 inp_freemoptions(inp->inp_moptions); 439 inp->inp_vflag = 0; 440 crfree(inp->inp_cred); 441 #ifdef MAC 442 mac_destroy_inpcb(inp); 443 #endif 444 INP_WUNLOCK(inp); 445 uma_zfree(ipi->ipi_zone, inp); 446 } 447 448 struct sockaddr * 449 in6_sockaddr(in_port_t port, struct in6_addr *addr_p) 450 { 451 struct sockaddr_in6 *sin6; 452 453 MALLOC(sin6, struct sockaddr_in6 *, sizeof *sin6, M_SONAME, M_WAITOK); 454 bzero(sin6, sizeof *sin6); 455 sin6->sin6_family = AF_INET6; 456 sin6->sin6_len = sizeof(*sin6); 457 sin6->sin6_port = port; 458 sin6->sin6_addr = *addr_p; 459 (void)sa6_recoverscope(sin6); /* XXX: should catch errors */ 460 461 return (struct sockaddr *)sin6; 462 } 463 464 struct sockaddr * 465 in6_v4mapsin6_sockaddr(in_port_t port, struct in_addr *addr_p) 466 { 467 struct sockaddr_in sin; 468 struct sockaddr_in6 *sin6_p; 469 470 bzero(&sin, sizeof sin); 471 sin.sin_family = AF_INET; 472 sin.sin_len = sizeof(sin); 473 sin.sin_port = port; 474 sin.sin_addr = *addr_p; 475 476 MALLOC(sin6_p, struct sockaddr_in6 *, sizeof *sin6_p, M_SONAME, 477 M_WAITOK); 478 in6_sin_2_v4mapsin6(&sin, sin6_p); 479 480 return (struct sockaddr *)sin6_p; 481 } 482 483 int 484 in6_getsockaddr(struct socket *so, struct sockaddr **nam) 485 { 486 register struct inpcb *inp; 487 struct in6_addr addr; 488 in_port_t port; 489 490 inp = sotoinpcb(so); 491 KASSERT(inp != NULL, ("in6_getsockaddr: inp == NULL")); 492 493 INP_RLOCK(inp); 494 port = inp->inp_lport; 495 addr = inp->in6p_laddr; 496 INP_RUNLOCK(inp); 497 498 *nam = in6_sockaddr(port, &addr); 499 return 0; 500 } 501 502 int 503 in6_getpeeraddr(struct socket *so, struct sockaddr **nam) 504 { 505 struct inpcb *inp; 506 struct in6_addr addr; 507 in_port_t port; 508 509 inp = sotoinpcb(so); 510 KASSERT(inp != NULL, ("in6_getpeeraddr: inp == NULL")); 511 512 INP_RLOCK(inp); 513 port = inp->inp_fport; 514 addr = inp->in6p_faddr; 515 INP_RUNLOCK(inp); 516 517 *nam = in6_sockaddr(port, &addr); 518 return 0; 519 } 520 521 int 522 in6_mapped_sockaddr(struct socket *so, struct sockaddr **nam) 523 { 524 struct inpcb *inp; 525 int error; 526 527 inp = sotoinpcb(so); 528 KASSERT(inp != NULL, ("in6_mapped_sockaddr: inp == NULL")); 529 530 if ((inp->inp_vflag & (INP_IPV4 | INP_IPV6)) == INP_IPV4) { 531 error = in_getsockaddr(so, nam); 532 if (error == 0) 533 in6_sin_2_v4mapsin6_in_sock(nam); 534 } else { 535 /* scope issues will be handled in in6_getsockaddr(). */ 536 error = in6_getsockaddr(so, nam); 537 } 538 539 return error; 540 } 541 542 int 543 in6_mapped_peeraddr(struct socket *so, struct sockaddr **nam) 544 { 545 struct inpcb *inp; 546 int error; 547 548 inp = sotoinpcb(so); 549 KASSERT(inp != NULL, ("in6_mapped_peeraddr: inp == NULL")); 550 551 if ((inp->inp_vflag & (INP_IPV4 | INP_IPV6)) == INP_IPV4) { 552 error = in_getpeeraddr(so, nam); 553 if (error == 0) 554 in6_sin_2_v4mapsin6_in_sock(nam); 555 } else 556 /* scope issues will be handled in in6_getpeeraddr(). */ 557 error = in6_getpeeraddr(so, nam); 558 559 return error; 560 } 561 562 /* 563 * Pass some notification to all connections of a protocol 564 * associated with address dst. The local address and/or port numbers 565 * may be specified to limit the search. The "usual action" will be 566 * taken, depending on the ctlinput cmd. The caller must filter any 567 * cmds that are uninteresting (e.g., no error in the map). 568 * Call the protocol specific routine (if any) to report 569 * any errors for each matching socket. 570 */ 571 void 572 in6_pcbnotify(struct inpcbinfo *pcbinfo, struct sockaddr *dst, 573 u_int fport_arg, const struct sockaddr *src, u_int lport_arg, 574 int cmd, void *cmdarg, 575 struct inpcb *(*notify)(struct inpcb *, int)) 576 { 577 struct inpcb *inp, *inp_temp; 578 struct sockaddr_in6 sa6_src, *sa6_dst; 579 u_short fport = fport_arg, lport = lport_arg; 580 u_int32_t flowinfo; 581 int errno; 582 583 if ((unsigned)cmd >= PRC_NCMDS || dst->sa_family != AF_INET6) 584 return; 585 586 sa6_dst = (struct sockaddr_in6 *)dst; 587 if (IN6_IS_ADDR_UNSPECIFIED(&sa6_dst->sin6_addr)) 588 return; 589 590 /* 591 * note that src can be NULL when we get notify by local fragmentation. 592 */ 593 sa6_src = (src == NULL) ? sa6_any : *(const struct sockaddr_in6 *)src; 594 flowinfo = sa6_src.sin6_flowinfo; 595 596 /* 597 * Redirects go to all references to the destination, 598 * and use in6_rtchange to invalidate the route cache. 599 * Dead host indications: also use in6_rtchange to invalidate 600 * the cache, and deliver the error to all the sockets. 601 * Otherwise, if we have knowledge of the local port and address, 602 * deliver only to that socket. 603 */ 604 if (PRC_IS_REDIRECT(cmd) || cmd == PRC_HOSTDEAD) { 605 fport = 0; 606 lport = 0; 607 bzero((caddr_t)&sa6_src.sin6_addr, sizeof(sa6_src.sin6_addr)); 608 609 if (cmd != PRC_HOSTDEAD) 610 notify = in6_rtchange; 611 } 612 errno = inet6ctlerrmap[cmd]; 613 INP_INFO_WLOCK(pcbinfo); 614 LIST_FOREACH_SAFE(inp, pcbinfo->ipi_listhead, inp_list, inp_temp) { 615 INP_WLOCK(inp); 616 if ((inp->inp_vflag & INP_IPV6) == 0) { 617 INP_WUNLOCK(inp); 618 continue; 619 } 620 621 /* 622 * If the error designates a new path MTU for a destination 623 * and the application (associated with this socket) wanted to 624 * know the value, notify. Note that we notify for all 625 * disconnected sockets if the corresponding application 626 * wanted. This is because some UDP applications keep sending 627 * sockets disconnected. 628 * XXX: should we avoid to notify the value to TCP sockets? 629 */ 630 if (cmd == PRC_MSGSIZE && (inp->inp_flags & IN6P_MTU) != 0 && 631 (IN6_IS_ADDR_UNSPECIFIED(&inp->in6p_faddr) || 632 IN6_ARE_ADDR_EQUAL(&inp->in6p_faddr, &sa6_dst->sin6_addr))) { 633 ip6_notify_pmtu(inp, (struct sockaddr_in6 *)dst, 634 (u_int32_t *)cmdarg); 635 } 636 637 /* 638 * Detect if we should notify the error. If no source and 639 * destination ports are specifed, but non-zero flowinfo and 640 * local address match, notify the error. This is the case 641 * when the error is delivered with an encrypted buffer 642 * by ESP. Otherwise, just compare addresses and ports 643 * as usual. 644 */ 645 if (lport == 0 && fport == 0 && flowinfo && 646 inp->inp_socket != NULL && 647 flowinfo == (inp->in6p_flowinfo & IPV6_FLOWLABEL_MASK) && 648 IN6_ARE_ADDR_EQUAL(&inp->in6p_laddr, &sa6_src.sin6_addr)) 649 goto do_notify; 650 else if (!IN6_ARE_ADDR_EQUAL(&inp->in6p_faddr, 651 &sa6_dst->sin6_addr) || 652 inp->inp_socket == 0 || 653 (lport && inp->inp_lport != lport) || 654 (!IN6_IS_ADDR_UNSPECIFIED(&sa6_src.sin6_addr) && 655 !IN6_ARE_ADDR_EQUAL(&inp->in6p_laddr, 656 &sa6_src.sin6_addr)) || 657 (fport && inp->inp_fport != fport)) { 658 INP_WUNLOCK(inp); 659 continue; 660 } 661 662 do_notify: 663 if (notify) { 664 if ((*notify)(inp, errno)) 665 INP_WUNLOCK(inp); 666 } else 667 INP_WUNLOCK(inp); 668 } 669 INP_INFO_WUNLOCK(pcbinfo); 670 } 671 672 /* 673 * Lookup a PCB based on the local address and port. 674 */ 675 struct inpcb * 676 in6_pcblookup_local(struct inpcbinfo *pcbinfo, struct in6_addr *laddr, 677 u_short lport, int wild_okay, struct ucred *cred) 678 { 679 register struct inpcb *inp; 680 int matchwild = 3, wildcard; 681 682 INP_INFO_WLOCK_ASSERT(pcbinfo); 683 684 if (!wild_okay) { 685 struct inpcbhead *head; 686 /* 687 * Look for an unconnected (wildcard foreign addr) PCB that 688 * matches the local address and port we're looking for. 689 */ 690 head = &pcbinfo->ipi_hashbase[INP_PCBHASH(INADDR_ANY, lport, 691 0, pcbinfo->ipi_hashmask)]; 692 LIST_FOREACH(inp, head, inp_hash) { 693 if ((inp->inp_vflag & INP_IPV6) == 0) 694 continue; 695 if (IN6_IS_ADDR_UNSPECIFIED(&inp->in6p_faddr) && 696 IN6_ARE_ADDR_EQUAL(&inp->in6p_laddr, laddr) && 697 inp->inp_lport == lport) { 698 /* 699 * Found. 700 */ 701 return (inp); 702 } 703 } 704 /* 705 * Not found. 706 */ 707 return (NULL); 708 } else { 709 struct inpcbporthead *porthash; 710 struct inpcbport *phd; 711 struct inpcb *match = NULL; 712 /* 713 * Best fit PCB lookup. 714 * 715 * First see if this local port is in use by looking on the 716 * port hash list. 717 */ 718 porthash = &pcbinfo->ipi_porthashbase[INP_PCBPORTHASH(lport, 719 pcbinfo->ipi_porthashmask)]; 720 LIST_FOREACH(phd, porthash, phd_hash) { 721 if (phd->phd_port == lport) 722 break; 723 } 724 if (phd != NULL) { 725 /* 726 * Port is in use by one or more PCBs. Look for best 727 * fit. 728 */ 729 LIST_FOREACH(inp, &phd->phd_pcblist, inp_portlist) { 730 wildcard = 0; 731 if ((inp->inp_vflag & INP_IPV6) == 0) 732 continue; 733 if (!IN6_IS_ADDR_UNSPECIFIED(&inp->in6p_faddr)) 734 wildcard++; 735 if (!IN6_IS_ADDR_UNSPECIFIED( 736 &inp->in6p_laddr)) { 737 if (IN6_IS_ADDR_UNSPECIFIED(laddr)) 738 wildcard++; 739 else if (!IN6_ARE_ADDR_EQUAL( 740 &inp->in6p_laddr, laddr)) 741 continue; 742 } else { 743 if (!IN6_IS_ADDR_UNSPECIFIED(laddr)) 744 wildcard++; 745 } 746 if (wildcard < matchwild) { 747 match = inp; 748 matchwild = wildcard; 749 if (matchwild == 0) { 750 break; 751 } 752 } 753 } 754 } 755 return (match); 756 } 757 } 758 759 void 760 in6_pcbpurgeif0(struct inpcbinfo *pcbinfo, struct ifnet *ifp) 761 { 762 struct in6pcb *in6p; 763 struct ip6_moptions *im6o; 764 struct in6_multi_mship *imm, *nimm; 765 766 INP_INFO_RLOCK(pcbinfo); 767 LIST_FOREACH(in6p, pcbinfo->ipi_listhead, inp_list) { 768 INP_WLOCK(in6p); 769 im6o = in6p->in6p_moptions; 770 if ((in6p->inp_vflag & INP_IPV6) && 771 im6o) { 772 /* 773 * Unselect the outgoing interface if it is being 774 * detached. 775 */ 776 if (im6o->im6o_multicast_ifp == ifp) 777 im6o->im6o_multicast_ifp = NULL; 778 779 /* 780 * Drop multicast group membership if we joined 781 * through the interface being detached. 782 * XXX controversial - is it really legal for kernel 783 * to force this? 784 */ 785 for (imm = im6o->im6o_memberships.lh_first; 786 imm != NULL; imm = nimm) { 787 nimm = imm->i6mm_chain.le_next; 788 if (imm->i6mm_maddr->in6m_ifp == ifp) { 789 LIST_REMOVE(imm, i6mm_chain); 790 in6_delmulti(imm->i6mm_maddr); 791 free(imm, M_IP6MADDR); 792 } 793 } 794 } 795 INP_WUNLOCK(in6p); 796 } 797 INP_INFO_RUNLOCK(pcbinfo); 798 } 799 800 /* 801 * Check for alternatives when higher level complains 802 * about service problems. For now, invalidate cached 803 * routing information. If the route was created dynamically 804 * (by a redirect), time to try a default gateway again. 805 */ 806 void 807 in6_losing(struct inpcb *in6p) 808 { 809 810 /* 811 * We don't store route pointers in the routing table anymore 812 */ 813 return; 814 } 815 816 /* 817 * After a routing change, flush old routing 818 * and allocate a (hopefully) better one. 819 */ 820 struct inpcb * 821 in6_rtchange(struct inpcb *inp, int errno) 822 { 823 /* 824 * We don't store route pointers in the routing table anymore 825 */ 826 return inp; 827 } 828 829 /* 830 * Lookup PCB in hash list. 831 */ 832 struct inpcb * 833 in6_pcblookup_hash(struct inpcbinfo *pcbinfo, struct in6_addr *faddr, 834 u_int fport_arg, struct in6_addr *laddr, u_int lport_arg, 835 int wildcard, struct ifnet *ifp) 836 { 837 struct inpcbhead *head; 838 register struct inpcb *inp; 839 u_short fport = fport_arg, lport = lport_arg; 840 int faith; 841 842 INP_INFO_LOCK_ASSERT(pcbinfo); 843 844 if (faithprefix_p != NULL) 845 faith = (*faithprefix_p)(laddr); 846 else 847 faith = 0; 848 849 /* 850 * First look for an exact match. 851 */ 852 head = &pcbinfo->ipi_hashbase[ 853 INP_PCBHASH(faddr->s6_addr32[3] /* XXX */, lport, fport, 854 pcbinfo->ipi_hashmask)]; 855 LIST_FOREACH(inp, head, inp_hash) { 856 if ((inp->inp_vflag & INP_IPV6) == 0) 857 continue; 858 if (IN6_ARE_ADDR_EQUAL(&inp->in6p_faddr, faddr) && 859 IN6_ARE_ADDR_EQUAL(&inp->in6p_laddr, laddr) && 860 inp->inp_fport == fport && 861 inp->inp_lport == lport) { 862 /* 863 * Found. 864 */ 865 return (inp); 866 } 867 } 868 if (wildcard) { 869 struct inpcb *local_wild = NULL; 870 871 head = &pcbinfo->ipi_hashbase[INP_PCBHASH(INADDR_ANY, lport, 872 0, pcbinfo->ipi_hashmask)]; 873 LIST_FOREACH(inp, head, inp_hash) { 874 if ((inp->inp_vflag & INP_IPV6) == 0) 875 continue; 876 if (IN6_IS_ADDR_UNSPECIFIED(&inp->in6p_faddr) && 877 inp->inp_lport == lport) { 878 if (faith && (inp->inp_flags & INP_FAITH) == 0) 879 continue; 880 if (IN6_ARE_ADDR_EQUAL(&inp->in6p_laddr, 881 laddr)) 882 return (inp); 883 else if (IN6_IS_ADDR_UNSPECIFIED(&inp->in6p_laddr)) 884 local_wild = inp; 885 } 886 } 887 return (local_wild); 888 } 889 890 /* 891 * Not found. 892 */ 893 return (NULL); 894 } 895 896 void 897 init_sin6(struct sockaddr_in6 *sin6, struct mbuf *m) 898 { 899 struct ip6_hdr *ip; 900 901 ip = mtod(m, struct ip6_hdr *); 902 bzero(sin6, sizeof(*sin6)); 903 sin6->sin6_len = sizeof(*sin6); 904 sin6->sin6_family = AF_INET6; 905 sin6->sin6_addr = ip->ip6_src; 906 907 (void)sa6_recoverscope(sin6); /* XXX: should catch errors... */ 908 909 return; 910 }
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