in6_pcb.c revision 1.35
1 /* $NetBSD: in6_pcb.c,v 1.35 2001/02/11 06:49:52 itojun Exp $ */ 2 /* $KAME: in6_pcb.c,v 1.84 2001/02/08 18:02:08 itojun 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, 1991, 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 * 3. All advertising materials mentioning features or use of this software 46 * must display the following acknowledgement: 47 * This product includes software developed by the University of 48 * California, Berkeley and its contributors. 49 * 4. Neither the name of the University nor the names of its contributors 50 * may be used to endorse or promote products derived from this software 51 * without specific prior written permission. 52 * 53 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND 54 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 55 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 56 * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE 57 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 58 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 59 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 60 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 61 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 62 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 63 * SUCH DAMAGE. 64 * 65 * @(#)in_pcb.c 8.2 (Berkeley) 1/4/94 66 */ 67 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/protosw.h> 75 #include <sys/socket.h> 76 #include <sys/socketvar.h> 77 #include <sys/ioctl.h> 78 #include <sys/errno.h> 79 #include <sys/time.h> 80 #include <sys/proc.h> 81 82 #include <net/if.h> 83 #include <net/route.h> 84 85 #include <netinet/in.h> 86 #include <netinet/in_var.h> 87 #include <netinet/in_systm.h> 88 #include <netinet/ip.h> 89 #include <netinet/in_pcb.h> 90 #include <netinet/ip6.h> 91 #include <netinet6/ip6_var.h> 92 #include <netinet6/in6_pcb.h> 93 #include <netinet6/nd6.h> 94 95 #include "loop.h" 96 extern struct ifnet loif[NLOOP]; 97 #include "faith.h" 98 99 #ifdef IPSEC 100 #include <netinet6/ipsec.h> 101 #include <netkey/key.h> 102 #endif /* IPSEC */ 103 104 struct in6_addr zeroin6_addr; 105 106 int ip6_anonportmin = IPV6PORT_ANONMIN; 107 int ip6_anonportmax = IPV6PORT_ANONMAX; 108 int ip6_lowportmin = IPV6PORT_RESERVEDMIN; 109 int ip6_lowportmax = IPV6PORT_RESERVEDMAX; 110 111 int 112 in6_pcballoc(so, head) 113 struct socket *so; 114 struct in6pcb *head; 115 { 116 struct in6pcb *in6p; 117 118 MALLOC(in6p, struct in6pcb *, sizeof(*in6p), M_PCB, M_NOWAIT); 119 if (in6p == NULL) 120 return(ENOBUFS); 121 bzero((caddr_t)in6p, sizeof(*in6p)); 122 in6p->in6p_head = head; 123 in6p->in6p_socket = so; 124 in6p->in6p_hops = -1; /* use kernel default */ 125 in6p->in6p_icmp6filt = NULL; 126 in6p->in6p_next = head->in6p_next; 127 head->in6p_next = in6p; 128 in6p->in6p_prev = head; 129 in6p->in6p_next->in6p_prev = in6p; 130 #ifndef INET6_BINDV6ONLY 131 if (ip6_bindv6only) 132 in6p->in6p_flags |= IN6P_BINDV6ONLY; 133 #else 134 in6p->in6p_flags |= IN6P_BINDV6ONLY; /*just for safety*/ 135 #endif 136 so->so_pcb = (caddr_t)in6p; 137 return(0); 138 } 139 140 int 141 in6_pcbbind(in6p, nam, p) 142 struct in6pcb *in6p; 143 struct mbuf *nam; 144 struct proc *p; 145 { 146 struct socket *so = in6p->in6p_socket; 147 struct in6pcb *head = in6p->in6p_head; 148 struct sockaddr_in6 *sin6 = (struct sockaddr_in6 *)NULL; 149 u_int16_t lport = 0; 150 int wild = 0, reuseport = (so->so_options & SO_REUSEPORT); 151 152 if (in6p->in6p_lport || !IN6_IS_ADDR_UNSPECIFIED(&in6p->in6p_laddr)) 153 return(EINVAL); 154 if ((so->so_options & (SO_REUSEADDR|SO_REUSEPORT)) == 0 && 155 ((so->so_proto->pr_flags & PR_CONNREQUIRED) == 0 || 156 (so->so_options & SO_ACCEPTCONN) == 0)) 157 wild = IN6PLOOKUP_WILDCARD; 158 if (nam) { 159 sin6 = mtod(nam, struct sockaddr_in6 *); 160 if (nam->m_len != sizeof(*sin6)) 161 return(EINVAL); 162 /* 163 * We should check the family, but old programs 164 * incorrectly fail to intialize it. 165 */ 166 if (sin6->sin6_family != AF_INET6) 167 return(EAFNOSUPPORT); 168 169 /* 170 * since we do not check port number duplicate with IPv4 space, 171 * we reject it at this moment. If we leave it, we make normal 172 * user to hijack port number from other users. 173 */ 174 if (IN6_IS_ADDR_V4MAPPED(&sin6->sin6_addr)) 175 return(EADDRNOTAVAIL); 176 177 /* KAME hack: embed scopeid */ 178 if (in6_embedscope(&sin6->sin6_addr, sin6, in6p, NULL) != 0) 179 return EINVAL; 180 /* this must be cleared for ifa_ifwithaddr() */ 181 sin6->sin6_scope_id = 0; 182 183 lport = sin6->sin6_port; 184 if (IN6_IS_ADDR_MULTICAST(&sin6->sin6_addr)) { 185 /* 186 * Treat SO_REUSEADDR as SO_REUSEPORT for multicast; 187 * allow compepte duplication of binding if 188 * SO_REUSEPORT is set, or if SO_REUSEADDR is set 189 * and a multicast address is bound on both 190 * new and duplicated sockets. 191 */ 192 if (so->so_options & SO_REUSEADDR) 193 reuseport = SO_REUSEADDR|SO_REUSEPORT; 194 } else if (IN6_IS_ADDR_V4MAPPED(&sin6->sin6_addr)) { 195 struct sockaddr_in sin; 196 197 bzero(&sin, sizeof(sin)); 198 sin.sin_len = sizeof(sin); 199 sin.sin_family = AF_INET; 200 bcopy(&sin6->sin6_addr.s6_addr32[3], &sin.sin_addr, 201 sizeof(sin.sin_addr)); 202 if (ifa_ifwithaddr((struct sockaddr *)&sin) == 0) 203 return EADDRNOTAVAIL; 204 } else if (!IN6_IS_ADDR_UNSPECIFIED(&sin6->sin6_addr)) { 205 struct ifaddr *ia = NULL; 206 207 sin6->sin6_port = 0; /* yech... */ 208 #if defined(NFAITH) && NFAITH > 0 209 if ((in6p->in6p_flags & IN6P_FAITH) == 0 210 && (ia = ifa_ifwithaddr((struct sockaddr *)sin6)) == 0) 211 #else 212 if ((ia = ifa_ifwithaddr((struct sockaddr *)sin6)) == 0) 213 #endif 214 return(EADDRNOTAVAIL); 215 216 /* 217 * XXX: bind to an anycast address might accidentally 218 * cause sending a packet with anycast source address. 219 */ 220 if (ia && 221 ((struct in6_ifaddr *)ia)->ia6_flags & 222 (IN6_IFF_ANYCAST|IN6_IFF_NOTREADY| 223 IN6_IFF_DETACHED|IN6_IFF_DEPRECATED)) { 224 return(EADDRNOTAVAIL); 225 } 226 } 227 if (lport) { 228 #ifndef IPNOPRIVPORTS 229 int priv; 230 231 /* 232 * NOTE: all operating systems use suser() for 233 * privilege check! do not rewrite it into SS_PRIV. 234 */ 235 priv = (p && !suser(p->p_ucred, &p->p_acflag)) ? 1 : 0; 236 /* GROSS */ 237 if (ntohs(lport) < IPV6PORT_RESERVED && !priv) 238 return(EACCES); 239 #endif 240 241 if (IN6_IS_ADDR_V4MAPPED(&sin6->sin6_addr)) { 242 /* should check this but we can't ... */ 243 #if 0 244 struct inpcb *t; 245 246 t = in_pcblookup_bind(&tcbtable, 247 (struct in_addr *)&sin6->sin6_addr.s6_addr32[3], 248 lport); 249 if (t && (reuseport & t->inp_socket->so_options) == 0) 250 return EADDRINUSE; 251 #endif 252 } else { 253 struct in6pcb *t; 254 255 t = in6_pcblookup(head, &zeroin6_addr, 0, 256 &sin6->sin6_addr, lport, wild); 257 if (t && (reuseport & t->in6p_socket->so_options) == 0) 258 return(EADDRINUSE); 259 } 260 } 261 in6p->in6p_laddr = sin6->sin6_addr; 262 } 263 264 if (lport == 0) { 265 int e; 266 if ((e = in6_pcbsetport(&in6p->in6p_laddr, in6p)) != 0) 267 return(e); 268 } 269 else 270 in6p->in6p_lport = lport; 271 272 in6p->in6p_flowinfo = sin6 ? sin6->sin6_flowinfo : 0; /*XXX*/ 273 return(0); 274 } 275 276 /* 277 * Connect from a socket to a specified address. 278 * Both address and port must be specified in argument sin6. 279 * If don't have a local address for this socket yet, 280 * then pick one. 281 */ 282 int 283 in6_pcbconnect(in6p, nam) 284 struct in6pcb *in6p; 285 struct mbuf *nam; 286 { 287 struct in6_addr *in6a = NULL; 288 struct sockaddr_in6 *sin6 = mtod(nam, struct sockaddr_in6 *); 289 struct ifnet *ifp = NULL; /* outgoing interface */ 290 int error = 0; 291 #ifdef INET 292 struct in6_addr mapped; 293 #endif 294 struct sockaddr_in6 tmp; 295 296 (void)&in6a; /* XXX fool gcc */ 297 298 if (nam->m_len != sizeof(*sin6)) 299 return(EINVAL); 300 if (sin6->sin6_family != AF_INET6) 301 return(EAFNOSUPPORT); 302 if (sin6->sin6_port == 0) 303 return(EADDRNOTAVAIL); 304 305 /* sanity check for mapped address case */ 306 if (IN6_IS_ADDR_V4MAPPED(&sin6->sin6_addr)) { 307 if (IN6_IS_ADDR_UNSPECIFIED(&in6p->in6p_laddr)) 308 in6p->in6p_laddr.s6_addr16[5] = htons(0xffff); 309 if (!IN6_IS_ADDR_V4MAPPED(&in6p->in6p_laddr)) 310 return EINVAL; 311 } else { 312 if (IN6_IS_ADDR_V4MAPPED(&in6p->in6p_laddr)) 313 return EINVAL; 314 } 315 316 /* protect *sin6 from overwrites */ 317 tmp = *sin6; 318 sin6 = &tmp; 319 320 /* KAME hack: embed scopeid */ 321 if (in6_embedscope(&sin6->sin6_addr, sin6, in6p, &ifp) != 0) 322 return EINVAL; 323 324 /* Source address selection. */ 325 if (IN6_IS_ADDR_V4MAPPED(&in6p->in6p_laddr) 326 && in6p->in6p_laddr.s6_addr32[3] == 0) { 327 #ifdef INET 328 struct sockaddr_in sin, *sinp; 329 330 bzero(&sin, sizeof(sin)); 331 sin.sin_len = sizeof(sin); 332 sin.sin_family = AF_INET; 333 bcopy(&sin6->sin6_addr.s6_addr32[3], &sin.sin_addr, 334 sizeof(sin.sin_addr)); 335 sinp = in_selectsrc(&sin, (struct route *)&in6p->in6p_route, 336 in6p->in6p_socket->so_options, NULL, &error); 337 if (sinp == 0) { 338 if (error == 0) 339 error = EADDRNOTAVAIL; 340 return(error); 341 } 342 bzero(&mapped, sizeof(mapped)); 343 mapped.s6_addr16[5] = htons(0xffff); 344 bcopy(&sinp->sin_addr, &mapped.s6_addr32[3], sizeof(sinp->sin_addr)); 345 in6a = &mapped; 346 #else 347 return EADDRNOTAVAIL; 348 #endif 349 } else { 350 /* 351 * XXX: in6_selectsrc might replace the bound local address 352 * with the address specified by setsockopt(IPV6_PKTINFO). 353 * Is it the intended behavior? 354 */ 355 in6a = in6_selectsrc(sin6, in6p->in6p_outputopts, 356 in6p->in6p_moptions, 357 &in6p->in6p_route, 358 &in6p->in6p_laddr, &error); 359 if (in6a == 0) { 360 if (error == 0) 361 error = EADDRNOTAVAIL; 362 return(error); 363 } 364 } 365 if (in6p->in6p_route.ro_rt) 366 ifp = in6p->in6p_route.ro_rt->rt_ifp; 367 368 in6p->in6p_ip6.ip6_hlim = (u_int8_t)in6_selecthlim(in6p, ifp); 369 370 if (in6_pcblookup(in6p->in6p_head, 371 &sin6->sin6_addr, 372 sin6->sin6_port, 373 IN6_IS_ADDR_UNSPECIFIED(&in6p->in6p_laddr) ? 374 in6a : &in6p->in6p_laddr, 375 in6p->in6p_lport, 376 0)) 377 return(EADDRINUSE); 378 if (IN6_IS_ADDR_UNSPECIFIED(&in6p->in6p_laddr) 379 || (IN6_IS_ADDR_V4MAPPED(&in6p->in6p_laddr) 380 && in6p->in6p_laddr.s6_addr32[3] == 0)) { 381 if (in6p->in6p_lport == 0) { 382 (void)in6_pcbbind(in6p, (struct mbuf *)0, 383 (struct proc *)0); 384 } 385 in6p->in6p_laddr = *in6a; 386 } 387 in6p->in6p_faddr = sin6->sin6_addr; 388 in6p->in6p_fport = sin6->sin6_port; 389 /* 390 * xxx kazu flowlabel is necessary for connect? 391 * but if this line is missing, the garbage value remains. 392 */ 393 in6p->in6p_flowinfo = sin6->sin6_flowinfo; 394 return(0); 395 } 396 397 void 398 in6_pcbdisconnect(in6p) 399 struct in6pcb *in6p; 400 { 401 bzero((caddr_t)&in6p->in6p_faddr, sizeof(in6p->in6p_faddr)); 402 in6p->in6p_fport = 0; 403 if (in6p->in6p_socket->so_state & SS_NOFDREF) 404 in6_pcbdetach(in6p); 405 } 406 407 void 408 in6_pcbdetach(in6p) 409 struct in6pcb *in6p; 410 { 411 struct socket *so = in6p->in6p_socket; 412 413 #ifdef IPSEC 414 ipsec6_delete_pcbpolicy(in6p); 415 #endif /* IPSEC */ 416 sotoin6pcb(so) = 0; 417 sofree(so); 418 if (in6p->in6p_options) 419 m_freem(in6p->in6p_options); 420 if (in6p->in6p_outputopts) { 421 if (in6p->in6p_outputopts->ip6po_rthdr && 422 in6p->in6p_outputopts->ip6po_route.ro_rt) 423 RTFREE(in6p->in6p_outputopts->ip6po_route.ro_rt); 424 if (in6p->in6p_outputopts->ip6po_m) 425 (void)m_free(in6p->in6p_outputopts->ip6po_m); 426 free(in6p->in6p_outputopts, M_IP6OPT); 427 } 428 if (in6p->in6p_route.ro_rt) 429 rtfree(in6p->in6p_route.ro_rt); 430 ip6_freemoptions(in6p->in6p_moptions); 431 in6p->in6p_next->in6p_prev = in6p->in6p_prev; 432 in6p->in6p_prev->in6p_next = in6p->in6p_next; 433 in6p->in6p_prev = NULL; 434 FREE(in6p, M_PCB); 435 } 436 437 void 438 in6_setsockaddr(in6p, nam) 439 struct in6pcb *in6p; 440 struct mbuf *nam; 441 { 442 struct sockaddr_in6 *sin6; 443 444 nam->m_len = sizeof(*sin6); 445 sin6 = mtod(nam, struct sockaddr_in6 *); 446 bzero((caddr_t)sin6, sizeof(*sin6)); 447 sin6->sin6_family = AF_INET6; 448 sin6->sin6_len = sizeof(struct sockaddr_in6); 449 sin6->sin6_port = in6p->in6p_lport; 450 /* KAME hack: recover scopeid */ 451 (void)in6_recoverscope(sin6, &in6p->in6p_laddr, NULL); 452 } 453 454 void 455 in6_setpeeraddr(in6p, nam) 456 struct in6pcb *in6p; 457 struct mbuf *nam; 458 { 459 struct sockaddr_in6 *sin6; 460 461 nam->m_len = sizeof(*sin6); 462 sin6 = mtod(nam, struct sockaddr_in6 *); 463 bzero((caddr_t)sin6, sizeof(*sin6)); 464 sin6->sin6_family = AF_INET6; 465 sin6->sin6_len = sizeof(struct sockaddr_in6); 466 sin6->sin6_port = in6p->in6p_fport; 467 /* KAME hack: recover scopeid */ 468 (void)in6_recoverscope(sin6, &in6p->in6p_faddr, NULL); 469 } 470 471 /* 472 * Pass some notification to all connections of a protocol 473 * associated with address dst. The local address and/or port numbers 474 * may be specified to limit the search. The "usual action" will be 475 * taken, depending on the ctlinput cmd. The caller must filter any 476 * cmds that are uninteresting (e.g., no error in the map). 477 * Call the protocol specific routine (if any) to report 478 * any errors for each matching socket. 479 * 480 * Must be called at splsoftnet. 481 * 482 * Note: src (4th arg) carries the flowlabel value on the original IPv6 483 * header, in sin6_flowinfo member. 484 */ 485 int 486 in6_pcbnotify(head, dst, fport_arg, src, lport_arg, cmd, cmdarg, notify) 487 struct in6pcb *head; 488 struct sockaddr *dst, *src; 489 u_int fport_arg, lport_arg; 490 int cmd; 491 void *cmdarg; 492 void (*notify) __P((struct in6pcb *, int)); 493 { 494 struct in6pcb *in6p, *nin6p; 495 struct sockaddr_in6 sa6_src, *sa6_dst; 496 u_int16_t fport = fport_arg, lport = lport_arg; 497 int errno; 498 int nmatch = 0; 499 u_int32_t flowinfo; 500 501 if ((unsigned)cmd > PRC_NCMDS || dst->sa_family != AF_INET6) 502 return 0; 503 504 sa6_dst = (struct sockaddr_in6 *)dst; 505 if (IN6_IS_ADDR_UNSPECIFIED(&sa6_dst->sin6_addr)) 506 return 0; 507 508 /* 509 * note that src can be NULL when we get notify by local fragmentation. 510 */ 511 sa6_src = (src == NULL) ? sa6_any : *(struct sockaddr_in6 *)src; 512 flowinfo = sa6_src.sin6_flowinfo; 513 514 /* 515 * Redirects go to all references to the destination, 516 * and use in6_rtchange to invalidate the route cache. 517 * Dead host indications: also use in6_rtchange to invalidate 518 * the cache, and deliver the error to all the sockets. 519 * Otherwise, if we have knowledge of the local port and address, 520 * deliver only to that socket. 521 */ 522 if (PRC_IS_REDIRECT(cmd) || cmd == PRC_HOSTDEAD) { 523 fport = 0; 524 lport = 0; 525 bzero((caddr_t)&sa6_src.sin6_addr, sizeof(sa6_src.sin6_addr)); 526 527 if (cmd != PRC_HOSTDEAD) 528 notify = in6_rtchange; 529 } 530 531 errno = inet6ctlerrmap[cmd]; 532 for (in6p = head->in6p_next; in6p != head; in6p = nin6p) { 533 nin6p = in6p->in6p_next; 534 535 /* 536 * Under the following condition, notify of redirects 537 * to the pcb, without making address matches against inpcb. 538 * - redirect notification is arrived. 539 * - the inpcb is unconnected. 540 * - the inpcb is caching !RTF_HOST routing entry. 541 * - the ICMPv6 notification is from the gateway cached in the 542 * inpcb. i.e. ICMPv6 notification is from nexthop gateway 543 * the inpcb used very recently. 544 * 545 * This is to improve interaction between netbsd/openbsd 546 * redirect handling code, and inpcb route cache code. 547 * without the clause, !RTF_HOST routing entry (which carries 548 * gateway used by inpcb right before the ICMPv6 redirect) 549 * will be cached forever in unconnected inpcb. 550 * 551 * There still is a question regarding to what is TRT: 552 * - On bsdi/freebsd, RTF_HOST (cloned) routing entry will be 553 * generated on packet output. inpcb will always cache 554 * RTF_HOST routing entry so there's no need for the clause 555 * (ICMPv6 redirect will update RTF_HOST routing entry, 556 * and inpcb is caching it already). 557 * However, bsdi/freebsd are vulnerable to local DoS attacks 558 * due to the cloned routing entries. 559 * - Specwise, "destination cache" is mentioned in RFC2461. 560 * Jinmei says that it implies bsdi/freebsd behavior, itojun 561 * is not really convinced. 562 * - Having hiwat/lowat on # of cloned host route (redirect/ 563 * pmtud) may be a good idea. netbsd/openbsd has it. see 564 * icmp6_mtudisc_update(). 565 */ 566 if ((PRC_IS_REDIRECT(cmd) || cmd == PRC_HOSTDEAD) && 567 IN6_IS_ADDR_UNSPECIFIED(&in6p->in6p_laddr) && 568 in6p->in6p_route.ro_rt && 569 !(in6p->in6p_route.ro_rt->rt_flags & RTF_HOST)) { 570 struct sockaddr_in6 *dst6; 571 572 dst6 = (struct sockaddr_in6 *)&in6p->in6p_route.ro_dst; 573 if (IN6_ARE_ADDR_EQUAL(&dst6->sin6_addr, 574 &sa6_dst->sin6_addr)) 575 goto do_notify; 576 } 577 578 /* 579 * Detect if we should notify the error. If no source and 580 * destination ports are specifed, but non-zero flowinfo and 581 * local address match, notify the error. This is the case 582 * when the error is delivered with an encrypted buffer 583 * by ESP. Otherwise, just compare addresses and ports 584 * as usual. 585 */ 586 if (lport == 0 && fport == 0 && flowinfo && 587 in6p->in6p_socket != NULL && 588 flowinfo == (in6p->in6p_flowinfo & IPV6_FLOWLABEL_MASK) && 589 IN6_ARE_ADDR_EQUAL(&in6p->in6p_laddr, &sa6_src.sin6_addr)) 590 goto do_notify; 591 else if (!IN6_ARE_ADDR_EQUAL(&in6p->in6p_faddr, 592 &sa6_dst->sin6_addr) || 593 in6p->in6p_socket == 0 || 594 (lport && in6p->in6p_lport != lport) || 595 (!IN6_IS_ADDR_UNSPECIFIED(&sa6_src.sin6_addr) && 596 !IN6_ARE_ADDR_EQUAL(&in6p->in6p_laddr, 597 &sa6_src.sin6_addr)) || 598 (fport && in6p->in6p_fport != fport)) 599 continue; 600 601 do_notify: 602 if (notify) 603 (*notify)(in6p, errno); 604 nmatch++; 605 } 606 return nmatch; 607 } 608 609 void 610 in6_pcbpurgeif(head, ifp) 611 struct in6pcb *head; 612 struct ifnet *ifp; 613 { 614 struct in6pcb *in6p, *nin6p; 615 616 for (in6p = head->in6p_next; in6p != head; in6p = nin6p) { 617 nin6p = in6p->in6p_next; 618 if (in6p->in6p_route.ro_rt != NULL && 619 in6p->in6p_route.ro_rt->rt_ifp == ifp) 620 in6_rtchange(in6p, 0); 621 } 622 } 623 624 /* 625 * Check for alternatives when higher level complains 626 * about service problems. For now, invalidate cached 627 * routing information. If the route was created dynamically 628 * (by a redirect), time to try a default gateway again. 629 */ 630 void 631 in6_losing(in6p) 632 struct in6pcb *in6p; 633 { 634 struct rtentry *rt; 635 struct rt_addrinfo info; 636 637 if ((rt = in6p->in6p_route.ro_rt) != NULL) { 638 in6p->in6p_route.ro_rt = 0; 639 bzero((caddr_t)&info, sizeof(info)); 640 info.rti_info[RTAX_DST] = 641 (struct sockaddr *)&in6p->in6p_route.ro_dst; 642 info.rti_info[RTAX_GATEWAY] = rt->rt_gateway; 643 info.rti_info[RTAX_NETMASK] = rt_mask(rt); 644 rt_missmsg(RTM_LOSING, &info, rt->rt_flags, 0); 645 if (rt->rt_flags & RTF_DYNAMIC) 646 (void)rtrequest(RTM_DELETE, rt_key(rt), 647 rt->rt_gateway, rt_mask(rt), rt->rt_flags, 648 (struct rtentry **)0); 649 else 650 /* 651 * A new route can be allocated 652 * the next time output is attempted. 653 */ 654 rtfree(rt); 655 } 656 } 657 658 /* 659 * After a routing change, flush old routing 660 * and allocate a (hopefully) better one. 661 */ 662 void 663 in6_rtchange(in6p, errno) 664 struct in6pcb *in6p; 665 int errno; 666 { 667 if (in6p->in6p_route.ro_rt) { 668 rtfree(in6p->in6p_route.ro_rt); 669 in6p->in6p_route.ro_rt = 0; 670 /* 671 * A new route can be allocated the next time 672 * output is attempted. 673 */ 674 } 675 } 676 677 struct in6pcb * 678 in6_pcblookup(head, faddr6, fport_arg, laddr6, lport_arg, flags) 679 struct in6pcb *head; 680 struct in6_addr *faddr6, *laddr6; 681 u_int fport_arg, lport_arg; 682 int flags; 683 { 684 struct in6pcb *in6p, *match = 0; 685 int matchwild = 3, wildcard; 686 u_int16_t fport = fport_arg, lport = lport_arg; 687 688 for (in6p = head->in6p_next; in6p != head; in6p = in6p->in6p_next) { 689 if (in6p->in6p_lport != lport) 690 continue; 691 wildcard = 0; 692 if (!IN6_IS_ADDR_UNSPECIFIED(&in6p->in6p_laddr)) { 693 if (IN6_IS_ADDR_UNSPECIFIED(laddr6)) 694 wildcard++; 695 else if (!IN6_ARE_ADDR_EQUAL(&in6p->in6p_laddr, laddr6)) 696 continue; 697 } 698 else if (IN6_IS_ADDR_V4MAPPED(&in6p->in6p_laddr) 699 && in6p->in6p_laddr.s6_addr32[3] == 0) { 700 if (!IN6_IS_ADDR_V4MAPPED(laddr6)) 701 continue; 702 if (laddr6->s6_addr32[3] == 0) 703 ; 704 else 705 wildcard++; 706 } 707 else { 708 if (IN6_IS_ADDR_V4MAPPED(laddr6)) { 709 #ifndef INET6_BINDV6ONLY 710 if (in6p->in6p_flags & IN6P_BINDV6ONLY) 711 continue; 712 else 713 wildcard++; 714 #else 715 continue; 716 #endif 717 } else if (!IN6_IS_ADDR_UNSPECIFIED(laddr6)) 718 wildcard++; 719 } 720 if (!IN6_IS_ADDR_UNSPECIFIED(&in6p->in6p_faddr)) { 721 if (IN6_IS_ADDR_UNSPECIFIED(faddr6)) 722 wildcard++; 723 else if (!IN6_ARE_ADDR_EQUAL(&in6p->in6p_faddr, faddr6) 724 || in6p->in6p_fport != fport) 725 continue; 726 } 727 else if (IN6_IS_ADDR_V4MAPPED(&in6p->in6p_faddr) 728 && in6p->in6p_faddr.s6_addr32[3] == 0) { 729 if (!IN6_IS_ADDR_V4MAPPED(faddr6)) 730 continue; 731 if (faddr6->s6_addr32[3] == 0) 732 ; 733 else 734 wildcard++; 735 } 736 else { 737 if (IN6_IS_ADDR_V4MAPPED(faddr6)) { 738 #ifndef INET6_BINDV6ONLY 739 if (in6p->in6p_flags & IN6P_BINDV6ONLY) 740 continue; 741 else 742 wildcard++; 743 #else 744 continue; 745 #endif 746 } else if (!IN6_IS_ADDR_UNSPECIFIED(faddr6)) 747 wildcard++; 748 } 749 750 if (wildcard && (flags & IN6PLOOKUP_WILDCARD) == 0) 751 continue; 752 if (wildcard < matchwild) { 753 match = in6p; 754 matchwild = wildcard; 755 if (matchwild == 0) 756 break; 757 } 758 } 759 return(match); 760 } 761 762 struct rtentry * 763 in6_pcbrtentry(in6p) 764 struct in6pcb *in6p; 765 { 766 struct route_in6 *ro; 767 struct sockaddr_in6 *dst6; 768 769 ro = &in6p->in6p_route; 770 dst6 = (struct sockaddr_in6 *)&ro->ro_dst; 771 772 if (ro->ro_rt == NULL) { 773 /* 774 * No route yet, so try to acquire one. 775 */ 776 if (!IN6_IS_ADDR_UNSPECIFIED(&in6p->in6p_faddr)) { 777 bzero(dst6, sizeof(*dst6)); 778 dst6->sin6_family = AF_INET6; 779 dst6->sin6_len = sizeof(struct sockaddr_in6); 780 dst6->sin6_addr = in6p->in6p_faddr; 781 rtalloc((struct route *)ro); 782 } 783 } 784 return (ro->ro_rt); 785 } 786 787 struct in6pcb * 788 in6_pcblookup_connect(head, faddr6, fport_arg, laddr6, lport_arg, faith) 789 struct in6pcb *head; 790 struct in6_addr *faddr6, *laddr6; 791 u_int fport_arg, lport_arg; 792 int faith; 793 { 794 struct in6pcb *in6p; 795 u_int16_t fport = fport_arg, lport = lport_arg; 796 797 for (in6p = head->in6p_next; in6p != head; in6p = in6p->in6p_next) { 798 /* find exact match on both source and dest */ 799 if (in6p->in6p_fport != fport) 800 continue; 801 if (in6p->in6p_lport != lport) 802 continue; 803 if (IN6_IS_ADDR_UNSPECIFIED(&in6p->in6p_faddr)) 804 continue; 805 if (!IN6_ARE_ADDR_EQUAL(&in6p->in6p_faddr, faddr6)) 806 continue; 807 if (IN6_IS_ADDR_UNSPECIFIED(&in6p->in6p_laddr)) 808 continue; 809 if (!IN6_ARE_ADDR_EQUAL(&in6p->in6p_laddr, laddr6)) 810 continue; 811 return in6p; 812 } 813 return NULL; 814 } 815 816 struct in6pcb * 817 in6_pcblookup_bind(head, laddr6, lport_arg, faith) 818 struct in6pcb *head; 819 struct in6_addr *laddr6; 820 u_int lport_arg; 821 int faith; 822 { 823 struct in6pcb *in6p, *match; 824 u_int16_t lport = lport_arg; 825 826 match = NULL; 827 for (in6p = head->in6p_next; in6p != head; in6p = in6p->in6p_next) { 828 /* 829 * find destination match. exact match is preferred 830 * against wildcard match. 831 */ 832 #if defined(NFAITH) && NFAITH > 0 833 if (faith && (in6p->in6p_flags & IN6P_FAITH) == 0) 834 continue; 835 #endif 836 if (in6p->in6p_fport != 0) 837 continue; 838 if (in6p->in6p_lport != lport) 839 continue; 840 if (IN6_IS_ADDR_UNSPECIFIED(&in6p->in6p_laddr)) { 841 if (IN6_IS_ADDR_V4MAPPED(laddr6)) { 842 #ifndef INET6_BINDV6ONLY 843 if (in6p->in6p_flags & IN6P_BINDV6ONLY) 844 continue; 845 else 846 match = in6p; 847 #else 848 continue; 849 #endif 850 } else 851 match = in6p; 852 } 853 else if (IN6_IS_ADDR_V4MAPPED(&in6p->in6p_laddr) && 854 in6p->in6p_laddr.s6_addr32[3] == 0) { 855 if (IN6_IS_ADDR_V4MAPPED(laddr6) && 856 laddr6->s6_addr32[3] != 0) 857 match = in6p; 858 } 859 else if (IN6_ARE_ADDR_EQUAL(&in6p->in6p_laddr, laddr6)) 860 return in6p; 861 } 862 return match; 863 } 864
Indexes created Tue Sep 23 01:09:51 GMT 2025