in6_pcb.c revision 181803
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: head/sys/netinet6/in6_pcb.c 181803 2008-08-17 23:27:27Z bz $"); 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#include <sys/vimage.h> 86 87#include <vm/uma.h> 88 89#include <net/if.h> 90#include <net/if_types.h> 91#include <net/route.h> 92 93#include <netinet/in.h> 94#include <netinet/in_var.h> 95#include <netinet/in_systm.h> 96#include <netinet/tcp_var.h> 97#include <netinet/ip6.h> 98#include <netinet/ip_var.h> 99#include <netinet6/ip6_var.h> 100#include <netinet6/nd6.h> 101#include <netinet/in_pcb.h> 102#include <netinet6/in6_pcb.h> 103#include <netinet6/scope6_var.h> 104 105#ifdef IPSEC 106#include <netipsec/ipsec.h> 107#include <netipsec/ipsec6.h> 108#include <netipsec/key.h> 109#endif /* IPSEC */ 110 111#include <security/mac/mac_framework.h> 112 113struct in6_addr zeroin6_addr; 114 115int 116in6_pcbbind(register struct inpcb *inp, struct sockaddr *nam, 117 struct ucred *cred) 118{ 119 struct socket *so = inp->inp_socket; 120 struct sockaddr_in6 *sin6 = (struct sockaddr_in6 *)NULL; 121 struct inpcbinfo *pcbinfo = inp->inp_pcbinfo; 122 u_short lport = 0; 123 int wild = 0, reuseport = (so->so_options & SO_REUSEPORT); 124 125 INP_INFO_WLOCK_ASSERT(pcbinfo); 126 INP_WLOCK_ASSERT(inp); 127 128 if (!V_in6_ifaddr) /* XXX broken! */ 129 return (EADDRNOTAVAIL); 130 if (inp->inp_lport || !IN6_IS_ADDR_UNSPECIFIED(&inp->in6p_laddr)) 131 return (EINVAL); 132 if ((so->so_options & (SO_REUSEADDR|SO_REUSEPORT)) == 0) 133 wild = INPLOOKUP_WILDCARD; 134 if (nam) { 135 int error; 136 137 sin6 = (struct sockaddr_in6 *)nam; 138 if (nam->sa_len != sizeof(*sin6)) 139 return (EINVAL); 140 /* 141 * family check. 142 */ 143 if (nam->sa_family != AF_INET6) 144 return (EAFNOSUPPORT); 145 146 if ((error = sa6_embedscope(sin6, V_ip6_use_defzone)) != 0) 147 return(error); 148 149 lport = sin6->sin6_port; 150 if (IN6_IS_ADDR_MULTICAST(&sin6->sin6_addr)) { 151 /* 152 * Treat SO_REUSEADDR as SO_REUSEPORT for multicast; 153 * allow compepte duplication of binding if 154 * SO_REUSEPORT is set, or if SO_REUSEADDR is set 155 * and a multicast address is bound on both 156 * new and duplicated sockets. 157 */ 158 if (so->so_options & SO_REUSEADDR) 159 reuseport = SO_REUSEADDR|SO_REUSEPORT; 160 } else if (!IN6_IS_ADDR_UNSPECIFIED(&sin6->sin6_addr)) { 161 struct ifaddr *ia = NULL; 162 163 sin6->sin6_port = 0; /* yech... */ 164 if ((ia = ifa_ifwithaddr((struct sockaddr *)sin6)) == 0) 165 return (EADDRNOTAVAIL); 166 167 /* 168 * XXX: bind to an anycast address might accidentally 169 * cause sending a packet with anycast source address. 170 * We should allow to bind to a deprecated address, since 171 * the application dares to use it. 172 */ 173 if (ia && 174 ((struct in6_ifaddr *)ia)->ia6_flags & 175 (IN6_IFF_ANYCAST|IN6_IFF_NOTREADY|IN6_IFF_DETACHED)) { 176 return (EADDRNOTAVAIL); 177 } 178 } 179 if (lport) { 180 struct inpcb *t; 181 182 /* GROSS */ 183 if (ntohs(lport) <= V_ipport_reservedhigh && 184 ntohs(lport) >= V_ipport_reservedlow && 185 priv_check_cred(cred, PRIV_NETINET_RESERVEDPORT, 186 0)) 187 return (EACCES); 188 if (!IN6_IS_ADDR_MULTICAST(&sin6->sin6_addr) && 189 priv_check_cred(so->so_cred, 190 PRIV_NETINET_REUSEPORT, 0) != 0) { 191 t = in6_pcblookup_local(pcbinfo, 192 &sin6->sin6_addr, lport, 193 INPLOOKUP_WILDCARD, cred); 194 if (t && 195 ((t->inp_vflag & INP_TIMEWAIT) == 0) && 196 (so->so_type != SOCK_STREAM || 197 IN6_IS_ADDR_UNSPECIFIED(&t->in6p_faddr)) && 198 (!IN6_IS_ADDR_UNSPECIFIED(&sin6->sin6_addr) || 199 !IN6_IS_ADDR_UNSPECIFIED(&t->in6p_laddr) || 200 (t->inp_socket->so_options & SO_REUSEPORT) 201 == 0) && (so->so_cred->cr_uid != 202 t->inp_socket->so_cred->cr_uid)) 203 return (EADDRINUSE); 204 if ((inp->inp_flags & IN6P_IPV6_V6ONLY) == 0 && 205 IN6_IS_ADDR_UNSPECIFIED(&sin6->sin6_addr)) { 206 struct sockaddr_in sin; 207 208 in6_sin6_2_sin(&sin, sin6); 209 t = in_pcblookup_local(pcbinfo, 210 sin.sin_addr, lport, 211 INPLOOKUP_WILDCARD, cred); 212 if (t && 213 ((t->inp_vflag & 214 INP_TIMEWAIT) == 0) && 215 (so->so_type != SOCK_STREAM || 216 ntohl(t->inp_faddr.s_addr) == 217 INADDR_ANY) && 218 (so->so_cred->cr_uid != 219 t->inp_socket->so_cred->cr_uid)) 220 return (EADDRINUSE); 221 } 222 } 223 t = in6_pcblookup_local(pcbinfo, &sin6->sin6_addr, 224 lport, wild, cred); 225 if (t && (reuseport & ((t->inp_vflag & INP_TIMEWAIT) ? 226 intotw(t)->tw_so_options : 227 t->inp_socket->so_options)) == 0) 228 return (EADDRINUSE); 229 if ((inp->inp_flags & IN6P_IPV6_V6ONLY) == 0 && 230 IN6_IS_ADDR_UNSPECIFIED(&sin6->sin6_addr)) { 231 struct sockaddr_in sin; 232 233 in6_sin6_2_sin(&sin, sin6); 234 t = in_pcblookup_local(pcbinfo, sin.sin_addr, 235 lport, wild, cred); 236 if (t && t->inp_vflag & INP_TIMEWAIT) { 237 if ((reuseport & 238 intotw(t)->tw_so_options) == 0 && 239 (ntohl(t->inp_laddr.s_addr) != 240 INADDR_ANY || ((inp->inp_vflag & 241 INP_IPV6PROTO) == 242 (t->inp_vflag & INP_IPV6PROTO)))) 243 return (EADDRINUSE); 244 } 245 else if (t && 246 (reuseport & t->inp_socket->so_options) 247 == 0 && (ntohl(t->inp_laddr.s_addr) != 248 INADDR_ANY || INP_SOCKAF(so) == 249 INP_SOCKAF(t->inp_socket))) 250 return (EADDRINUSE); 251 } 252 } 253 inp->in6p_laddr = sin6->sin6_addr; 254 } 255 if (lport == 0) { 256 int e; 257 if ((e = in6_pcbsetport(&inp->in6p_laddr, inp, cred)) != 0) 258 return (e); 259 } 260 else { 261 inp->inp_lport = lport; 262 if (in_pcbinshash(inp) != 0) { 263 inp->in6p_laddr = in6addr_any; 264 inp->inp_lport = 0; 265 return (EAGAIN); 266 } 267 } 268 return (0); 269} 270 271/* 272 * Transform old in6_pcbconnect() into an inner subroutine for new 273 * in6_pcbconnect(): Do some validity-checking on the remote 274 * address (in mbuf 'nam') and then determine local host address 275 * (i.e., which interface) to use to access that remote host. 276 * 277 * This preserves definition of in6_pcbconnect(), while supporting a 278 * slightly different version for T/TCP. (This is more than 279 * a bit of a kludge, but cleaning up the internal interfaces would 280 * have forced minor changes in every protocol). 281 */ 282int 283in6_pcbladdr(register struct inpcb *inp, struct sockaddr *nam, 284 struct in6_addr **plocal_addr6) 285{ 286 register struct sockaddr_in6 *sin6 = (struct sockaddr_in6 *)nam; 287 int error = 0; 288 struct ifnet *ifp = NULL; 289 int scope_ambiguous = 0; 290 291 INP_INFO_WLOCK_ASSERT(inp->inp_pcbinfo); 292 INP_WLOCK_ASSERT(inp); 293 294 if (nam->sa_len != sizeof (*sin6)) 295 return (EINVAL); 296 if (sin6->sin6_family != AF_INET6) 297 return (EAFNOSUPPORT); 298 if (sin6->sin6_port == 0) 299 return (EADDRNOTAVAIL); 300 301 if (sin6->sin6_scope_id == 0 && !V_ip6_use_defzone) 302 scope_ambiguous = 1; 303 if ((error = sa6_embedscope(sin6, V_ip6_use_defzone)) != 0) 304 return(error); 305 306 if (V_in6_ifaddr) { 307 /* 308 * If the destination address is UNSPECIFIED addr, 309 * use the loopback addr, e.g ::1. 310 */ 311 if (IN6_IS_ADDR_UNSPECIFIED(&sin6->sin6_addr)) 312 sin6->sin6_addr = in6addr_loopback; 313 } 314 315 /* 316 * XXX: in6_selectsrc might replace the bound local address 317 * with the address specified by setsockopt(IPV6_PKTINFO). 318 * Is it the intended behavior? 319 */ 320 *plocal_addr6 = in6_selectsrc(sin6, inp->in6p_outputopts, 321 inp, NULL, 322 inp->inp_socket->so_cred, 323 &ifp, &error); 324 if (ifp && scope_ambiguous && 325 (error = in6_setscope(&sin6->sin6_addr, ifp, NULL)) != 0) { 326 return(error); 327 } 328 329 if (*plocal_addr6 == 0) { 330 if (error == 0) 331 error = EADDRNOTAVAIL; 332 return (error); 333 } 334 /* 335 * Don't do pcblookup call here; return interface in 336 * plocal_addr6 337 * and exit to caller, that will do the lookup. 338 */ 339 340 return (0); 341} 342 343/* 344 * Outer subroutine: 345 * Connect from a socket to a specified address. 346 * Both address and port must be specified in argument sin. 347 * If don't have a local address for this socket yet, 348 * then pick one. 349 */ 350int 351in6_pcbconnect(register struct inpcb *inp, struct sockaddr *nam, 352 struct ucred *cred) 353{ 354 struct in6_addr *addr6; 355 register struct sockaddr_in6 *sin6 = (struct sockaddr_in6 *)nam; 356 int error; 357 358 INP_INFO_WLOCK_ASSERT(inp->inp_pcbinfo); 359 INP_WLOCK_ASSERT(inp); 360 361 /* 362 * Call inner routine, to assign local interface address. 363 * in6_pcbladdr() may automatically fill in sin6_scope_id. 364 */ 365 if ((error = in6_pcbladdr(inp, nam, &addr6)) != 0) 366 return (error); 367 368 if (in6_pcblookup_hash(inp->inp_pcbinfo, &sin6->sin6_addr, 369 sin6->sin6_port, 370 IN6_IS_ADDR_UNSPECIFIED(&inp->in6p_laddr) 371 ? addr6 : &inp->in6p_laddr, 372 inp->inp_lport, 0, NULL) != NULL) { 373 return (EADDRINUSE); 374 } 375 if (IN6_IS_ADDR_UNSPECIFIED(&inp->in6p_laddr)) { 376 if (inp->inp_lport == 0) { 377 error = in6_pcbbind(inp, (struct sockaddr *)0, cred); 378 if (error) 379 return (error); 380 } 381 inp->in6p_laddr = *addr6; 382 } 383 inp->in6p_faddr = sin6->sin6_addr; 384 inp->inp_fport = sin6->sin6_port; 385 /* update flowinfo - draft-itojun-ipv6-flowlabel-api-00 */ 386 inp->in6p_flowinfo &= ~IPV6_FLOWLABEL_MASK; 387 if (inp->in6p_flags & IN6P_AUTOFLOWLABEL) 388 inp->in6p_flowinfo |= 389 (htonl(ip6_randomflowlabel()) & IPV6_FLOWLABEL_MASK); 390 391 in_pcbrehash(inp); 392 393 return (0); 394} 395 396void 397in6_pcbdisconnect(struct inpcb *inp) 398{ 399 400 INP_INFO_WLOCK_ASSERT(inp->inp_pcbinfo); 401 INP_WLOCK_ASSERT(inp); 402 403 bzero((caddr_t)&inp->in6p_faddr, sizeof(inp->in6p_faddr)); 404 inp->inp_fport = 0; 405 /* clear flowinfo - draft-itojun-ipv6-flowlabel-api-00 */ 406 inp->in6p_flowinfo &= ~IPV6_FLOWLABEL_MASK; 407 in_pcbrehash(inp); 408} 409 410void 411in6_pcbdetach(struct inpcb *inp) 412{ 413 414 KASSERT(inp->inp_socket != NULL, ("in6_pcbdetach: inp_socket == NULL")); 415 inp->inp_socket->so_pcb = NULL; 416 inp->inp_socket = NULL; 417} 418 419void 420in6_pcbfree(struct inpcb *inp) 421{ 422 struct inpcbinfo *ipi = inp->inp_pcbinfo; 423 424 KASSERT(inp->inp_socket == NULL, ("in6_pcbfree: inp_socket != NULL")); 425 INP_INFO_WLOCK_ASSERT(inp->inp_pcbinfo); 426 INP_WLOCK_ASSERT(inp); 427 428#ifdef IPSEC 429 if (inp->in6p_sp != NULL) 430 ipsec6_delete_pcbpolicy(inp); 431#endif /* IPSEC */ 432 inp->inp_gencnt = ++ipi->ipi_gencnt; 433 in_pcbremlists(inp); 434 ip6_freepcbopts(inp->in6p_outputopts); 435 ip6_freemoptions(inp->in6p_moptions); 436 /* Check and free IPv4 related resources in case of mapped addr */ 437 if (inp->inp_options) 438 (void)m_free(inp->inp_options); 439 if (inp->inp_moptions != NULL) 440 inp_freemoptions(inp->inp_moptions); 441 inp->inp_vflag = 0; 442#ifdef MAC 443 mac_inpcb_destroy(inp); 444#endif 445 INP_WUNLOCK(inp); 446 uma_zfree(ipi->ipi_zone, inp); 447} 448 449struct sockaddr * 450in6_sockaddr(in_port_t port, struct in6_addr *addr_p) 451{ 452 struct sockaddr_in6 *sin6; 453 454 MALLOC(sin6, struct sockaddr_in6 *, sizeof *sin6, M_SONAME, M_WAITOK); 455 bzero(sin6, sizeof *sin6); 456 sin6->sin6_family = AF_INET6; 457 sin6->sin6_len = sizeof(*sin6); 458 sin6->sin6_port = port; 459 sin6->sin6_addr = *addr_p; 460 (void)sa6_recoverscope(sin6); /* XXX: should catch errors */ 461 462 return (struct sockaddr *)sin6; 463} 464 465struct sockaddr * 466in6_v4mapsin6_sockaddr(in_port_t port, struct in_addr *addr_p) 467{ 468 struct sockaddr_in sin; 469 struct sockaddr_in6 *sin6_p; 470 471 bzero(&sin, sizeof sin); 472 sin.sin_family = AF_INET; 473 sin.sin_len = sizeof(sin); 474 sin.sin_port = port; 475 sin.sin_addr = *addr_p; 476 477 MALLOC(sin6_p, struct sockaddr_in6 *, sizeof *sin6_p, M_SONAME, 478 M_WAITOK); 479 in6_sin_2_v4mapsin6(&sin, sin6_p); 480 481 return (struct sockaddr *)sin6_p; 482} 483 484int 485in6_getsockaddr(struct socket *so, struct sockaddr **nam) 486{ 487 register struct inpcb *inp; 488 struct in6_addr addr; 489 in_port_t port; 490 491 inp = sotoinpcb(so); 492 KASSERT(inp != NULL, ("in6_getsockaddr: inp == NULL")); 493 494 INP_RLOCK(inp); 495 port = inp->inp_lport; 496 addr = inp->in6p_laddr; 497 INP_RUNLOCK(inp); 498 499 *nam = in6_sockaddr(port, &addr); 500 return 0; 501} 502 503int 504in6_getpeeraddr(struct socket *so, struct sockaddr **nam) 505{ 506 struct inpcb *inp; 507 struct in6_addr addr; 508 in_port_t port; 509 510 inp = sotoinpcb(so); 511 KASSERT(inp != NULL, ("in6_getpeeraddr: inp == NULL")); 512 513 INP_RLOCK(inp); 514 port = inp->inp_fport; 515 addr = inp->in6p_faddr; 516 INP_RUNLOCK(inp); 517 518 *nam = in6_sockaddr(port, &addr); 519 return 0; 520} 521 522int 523in6_mapped_sockaddr(struct socket *so, struct sockaddr **nam) 524{ 525 struct inpcb *inp; 526 int error; 527 528 inp = sotoinpcb(so); 529 KASSERT(inp != NULL, ("in6_mapped_sockaddr: inp == NULL")); 530 531 if ((inp->inp_vflag & (INP_IPV4 | INP_IPV6)) == INP_IPV4) { 532 error = in_getsockaddr(so, nam); 533 if (error == 0) 534 in6_sin_2_v4mapsin6_in_sock(nam); 535 } else { 536 /* scope issues will be handled in in6_getsockaddr(). */ 537 error = in6_getsockaddr(so, nam); 538 } 539 540 return error; 541} 542 543int 544in6_mapped_peeraddr(struct socket *so, struct sockaddr **nam) 545{ 546 struct inpcb *inp; 547 int error; 548 549 inp = sotoinpcb(so); 550 KASSERT(inp != NULL, ("in6_mapped_peeraddr: inp == NULL")); 551 552 if ((inp->inp_vflag & (INP_IPV4 | INP_IPV6)) == INP_IPV4) { 553 error = in_getpeeraddr(so, nam); 554 if (error == 0) 555 in6_sin_2_v4mapsin6_in_sock(nam); 556 } else 557 /* scope issues will be handled in in6_getpeeraddr(). */ 558 error = in6_getpeeraddr(so, nam); 559 560 return error; 561} 562 563/* 564 * Pass some notification to all connections of a protocol 565 * associated with address dst. The local address and/or port numbers 566 * may be specified to limit the search. The "usual action" will be 567 * taken, depending on the ctlinput cmd. The caller must filter any 568 * cmds that are uninteresting (e.g., no error in the map). 569 * Call the protocol specific routine (if any) to report 570 * any errors for each matching socket. 571 */ 572void 573in6_pcbnotify(struct inpcbinfo *pcbinfo, struct sockaddr *dst, 574 u_int fport_arg, const struct sockaddr *src, u_int lport_arg, 575 int cmd, void *cmdarg, 576 struct inpcb *(*notify)(struct inpcb *, int)) 577{ 578 struct inpcb *inp, *inp_temp; 579 struct sockaddr_in6 sa6_src, *sa6_dst; 580 u_short fport = fport_arg, lport = lport_arg; 581 u_int32_t flowinfo; 582 int errno; 583 584 if ((unsigned)cmd >= PRC_NCMDS || dst->sa_family != AF_INET6) 585 return; 586 587 sa6_dst = (struct sockaddr_in6 *)dst; 588 if (IN6_IS_ADDR_UNSPECIFIED(&sa6_dst->sin6_addr)) 589 return; 590 591 /* 592 * note that src can be NULL when we get notify by local fragmentation. 593 */ 594 sa6_src = (src == NULL) ? sa6_any : *(const struct sockaddr_in6 *)src; 595 flowinfo = sa6_src.sin6_flowinfo; 596 597 /* 598 * Redirects go to all references to the destination, 599 * and use in6_rtchange to invalidate the route cache. 600 * Dead host indications: also use in6_rtchange to invalidate 601 * the cache, and deliver the error to all the sockets. 602 * Otherwise, if we have knowledge of the local port and address, 603 * deliver only to that socket. 604 */ 605 if (PRC_IS_REDIRECT(cmd) || cmd == PRC_HOSTDEAD) { 606 fport = 0; 607 lport = 0; 608 bzero((caddr_t)&sa6_src.sin6_addr, sizeof(sa6_src.sin6_addr)); 609 610 if (cmd != PRC_HOSTDEAD) 611 notify = in6_rtchange; 612 } 613 errno = inet6ctlerrmap[cmd]; 614 INP_INFO_WLOCK(pcbinfo); 615 LIST_FOREACH_SAFE(inp, pcbinfo->ipi_listhead, inp_list, inp_temp) { 616 INP_WLOCK(inp); 617 if ((inp->inp_vflag & INP_IPV6) == 0) { 618 INP_WUNLOCK(inp); 619 continue; 620 } 621 622 /* 623 * If the error designates a new path MTU for a destination 624 * and the application (associated with this socket) wanted to 625 * know the value, notify. Note that we notify for all 626 * disconnected sockets if the corresponding application 627 * wanted. This is because some UDP applications keep sending 628 * sockets disconnected. 629 * XXX: should we avoid to notify the value to TCP sockets? 630 */ 631 if (cmd == PRC_MSGSIZE && (inp->inp_flags & IN6P_MTU) != 0 && 632 (IN6_IS_ADDR_UNSPECIFIED(&inp->in6p_faddr) || 633 IN6_ARE_ADDR_EQUAL(&inp->in6p_faddr, &sa6_dst->sin6_addr))) { 634 ip6_notify_pmtu(inp, (struct sockaddr_in6 *)dst, 635 (u_int32_t *)cmdarg); 636 } 637 638 /* 639 * Detect if we should notify the error. If no source and 640 * destination ports are specifed, but non-zero flowinfo and 641 * local address match, notify the error. This is the case 642 * when the error is delivered with an encrypted buffer 643 * by ESP. Otherwise, just compare addresses and ports 644 * as usual. 645 */ 646 if (lport == 0 && fport == 0 && flowinfo && 647 inp->inp_socket != NULL && 648 flowinfo == (inp->in6p_flowinfo & IPV6_FLOWLABEL_MASK) && 649 IN6_ARE_ADDR_EQUAL(&inp->in6p_laddr, &sa6_src.sin6_addr)) 650 goto do_notify; 651 else if (!IN6_ARE_ADDR_EQUAL(&inp->in6p_faddr, 652 &sa6_dst->sin6_addr) || 653 inp->inp_socket == 0 || 654 (lport && inp->inp_lport != lport) || 655 (!IN6_IS_ADDR_UNSPECIFIED(&sa6_src.sin6_addr) && 656 !IN6_ARE_ADDR_EQUAL(&inp->in6p_laddr, 657 &sa6_src.sin6_addr)) || 658 (fport && inp->inp_fport != fport)) { 659 INP_WUNLOCK(inp); 660 continue; 661 } 662 663 do_notify: 664 if (notify) { 665 if ((*notify)(inp, errno)) 666 INP_WUNLOCK(inp); 667 } else 668 INP_WUNLOCK(inp); 669 } 670 INP_INFO_WUNLOCK(pcbinfo); 671} 672 673/* 674 * Lookup a PCB based on the local address and port. 675 */ 676struct inpcb * 677in6_pcblookup_local(struct inpcbinfo *pcbinfo, struct in6_addr *laddr, 678 u_short lport, int wild_okay, struct ucred *cred) 679{ 680 register struct inpcb *inp; 681 int matchwild = 3, wildcard; 682 683 INP_INFO_WLOCK_ASSERT(pcbinfo); 684 685 if (!wild_okay) { 686 struct inpcbhead *head; 687 /* 688 * Look for an unconnected (wildcard foreign addr) PCB that 689 * matches the local address and port we're looking for. 690 */ 691 head = &pcbinfo->ipi_hashbase[INP_PCBHASH(INADDR_ANY, lport, 692 0, pcbinfo->ipi_hashmask)]; 693 LIST_FOREACH(inp, head, inp_hash) { 694 if ((inp->inp_vflag & INP_IPV6) == 0) 695 continue; 696 if (IN6_IS_ADDR_UNSPECIFIED(&inp->in6p_faddr) && 697 IN6_ARE_ADDR_EQUAL(&inp->in6p_laddr, laddr) && 698 inp->inp_lport == lport) { 699 /* 700 * Found. 701 */ 702 return (inp); 703 } 704 } 705 /* 706 * Not found. 707 */ 708 return (NULL); 709 } else { 710 struct inpcbporthead *porthash; 711 struct inpcbport *phd; 712 struct inpcb *match = NULL; 713 /* 714 * Best fit PCB lookup. 715 * 716 * First see if this local port is in use by looking on the 717 * port hash list. 718 */ 719 porthash = &pcbinfo->ipi_porthashbase[INP_PCBPORTHASH(lport, 720 pcbinfo->ipi_porthashmask)]; 721 LIST_FOREACH(phd, porthash, phd_hash) { 722 if (phd->phd_port == lport) 723 break; 724 } 725 if (phd != NULL) { 726 /* 727 * Port is in use by one or more PCBs. Look for best 728 * fit. 729 */ 730 LIST_FOREACH(inp, &phd->phd_pcblist, inp_portlist) { 731 wildcard = 0; 732 if ((inp->inp_vflag & INP_IPV6) == 0) 733 continue; 734 if (!IN6_IS_ADDR_UNSPECIFIED(&inp->in6p_faddr)) 735 wildcard++; 736 if (!IN6_IS_ADDR_UNSPECIFIED( 737 &inp->in6p_laddr)) { 738 if (IN6_IS_ADDR_UNSPECIFIED(laddr)) 739 wildcard++; 740 else if (!IN6_ARE_ADDR_EQUAL( 741 &inp->in6p_laddr, laddr)) 742 continue; 743 } else { 744 if (!IN6_IS_ADDR_UNSPECIFIED(laddr)) 745 wildcard++; 746 } 747 if (wildcard < matchwild) { 748 match = inp; 749 matchwild = wildcard; 750 if (matchwild == 0) { 751 break; 752 } 753 } 754 } 755 } 756 return (match); 757 } 758} 759 760void 761in6_pcbpurgeif0(struct inpcbinfo *pcbinfo, struct ifnet *ifp) 762{ 763 struct in6pcb *in6p; 764 struct ip6_moptions *im6o; 765 struct in6_multi_mship *imm, *nimm; 766 767 INP_INFO_RLOCK(pcbinfo); 768 LIST_FOREACH(in6p, pcbinfo->ipi_listhead, inp_list) { 769 INP_WLOCK(in6p); 770 im6o = in6p->in6p_moptions; 771 if ((in6p->inp_vflag & INP_IPV6) && 772 im6o) { 773 /* 774 * Unselect the outgoing interface if it is being 775 * detached. 776 */ 777 if (im6o->im6o_multicast_ifp == ifp) 778 im6o->im6o_multicast_ifp = NULL; 779 780 /* 781 * Drop multicast group membership if we joined 782 * through the interface being detached. 783 * XXX controversial - is it really legal for kernel 784 * to force this? 785 */ 786 for (imm = im6o->im6o_memberships.lh_first; 787 imm != NULL; imm = nimm) { 788 nimm = imm->i6mm_chain.le_next; 789 if (imm->i6mm_maddr->in6m_ifp == ifp) { 790 LIST_REMOVE(imm, i6mm_chain); 791 in6_delmulti(imm->i6mm_maddr); 792 free(imm, M_IP6MADDR); 793 } 794 } 795 } 796 INP_WUNLOCK(in6p); 797 } 798 INP_INFO_RUNLOCK(pcbinfo); 799} 800 801/* 802 * Check for alternatives when higher level complains 803 * about service problems. For now, invalidate cached 804 * routing information. If the route was created dynamically 805 * (by a redirect), time to try a default gateway again. 806 */ 807void 808in6_losing(struct inpcb *in6p) 809{ 810 811 /* 812 * We don't store route pointers in the routing table anymore 813 */ 814 return; 815} 816 817/* 818 * After a routing change, flush old routing 819 * and allocate a (hopefully) better one. 820 */ 821struct inpcb * 822in6_rtchange(struct inpcb *inp, int errno) 823{ 824 /* 825 * We don't store route pointers in the routing table anymore 826 */ 827 return inp; 828} 829 830/* 831 * Lookup PCB in hash list. 832 */ 833struct inpcb * 834in6_pcblookup_hash(struct inpcbinfo *pcbinfo, struct in6_addr *faddr, 835 u_int fport_arg, struct in6_addr *laddr, u_int lport_arg, 836 int wildcard, struct ifnet *ifp) 837{ 838 struct inpcbhead *head; 839 register struct inpcb *inp; 840 u_short fport = fport_arg, lport = lport_arg; 841 int faith; 842 843 INP_INFO_LOCK_ASSERT(pcbinfo); 844 845 if (faithprefix_p != NULL) 846 faith = (*faithprefix_p)(laddr); 847 else 848 faith = 0; 849 850 /* 851 * First look for an exact match. 852 */ 853 head = &pcbinfo->ipi_hashbase[ 854 INP_PCBHASH(faddr->s6_addr32[3] /* XXX */, lport, fport, 855 pcbinfo->ipi_hashmask)]; 856 LIST_FOREACH(inp, head, inp_hash) { 857 if ((inp->inp_vflag & INP_IPV6) == 0) 858 continue; 859 if (IN6_ARE_ADDR_EQUAL(&inp->in6p_faddr, faddr) && 860 IN6_ARE_ADDR_EQUAL(&inp->in6p_laddr, laddr) && 861 inp->inp_fport == fport && 862 inp->inp_lport == lport) { 863 /* 864 * Found. 865 */ 866 return (inp); 867 } 868 } 869 if (wildcard) { 870 struct inpcb *local_wild = NULL; 871 872 head = &pcbinfo->ipi_hashbase[INP_PCBHASH(INADDR_ANY, lport, 873 0, pcbinfo->ipi_hashmask)]; 874 LIST_FOREACH(inp, head, inp_hash) { 875 if ((inp->inp_vflag & INP_IPV6) == 0) 876 continue; 877 if (IN6_IS_ADDR_UNSPECIFIED(&inp->in6p_faddr) && 878 inp->inp_lport == lport) { 879 if (faith && (inp->inp_flags & INP_FAITH) == 0) 880 continue; 881 if (IN6_ARE_ADDR_EQUAL(&inp->in6p_laddr, 882 laddr)) 883 return (inp); 884 else if (IN6_IS_ADDR_UNSPECIFIED(&inp->in6p_laddr)) 885 local_wild = inp; 886 } 887 } 888 return (local_wild); 889 } 890 891 /* 892 * Not found. 893 */ 894 return (NULL); 895} 896 897void 898init_sin6(struct sockaddr_in6 *sin6, struct mbuf *m) 899{ 900 struct ip6_hdr *ip; 901 902 ip = mtod(m, struct ip6_hdr *); 903 bzero(sin6, sizeof(*sin6)); 904 sin6->sin6_len = sizeof(*sin6); 905 sin6->sin6_family = AF_INET6; 906 sin6->sin6_addr = ip->ip6_src; 907 908 (void)sa6_recoverscope(sin6); /* XXX: should catch errors... */ 909 910 return; 911} 912