in6_pcb.c revision 1.39
1 /* $NetBSD: in6_pcb.c,v 1.39 2001/07/25 23:28:03 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 #ifdef IPSEC 118 int error; 119 #endif 120 121 MALLOC(in6p, struct in6pcb *, sizeof(*in6p), M_PCB, M_NOWAIT); 122 if (in6p == NULL) 123 return(ENOBUFS); 124 bzero((caddr_t)in6p, sizeof(*in6p)); 125 in6p->in6p_head = head; 126 in6p->in6p_socket = so; 127 in6p->in6p_hops = -1; /* use kernel default */ 128 in6p->in6p_icmp6filt = NULL; 129 #ifdef IPSEC 130 error = ipsec_init_policy(so, &in6p->in6p_sp); 131 if (error != 0) { 132 FREE(in6p, M_PCB); 133 return error; 134 } 135 #endif /*IPSEC*/ 136 in6p->in6p_next = head->in6p_next; 137 head->in6p_next = in6p; 138 in6p->in6p_prev = head; 139 in6p->in6p_next->in6p_prev = in6p; 140 #ifndef INET6_BINDV6ONLY 141 if (ip6_bindv6only) 142 in6p->in6p_flags |= IN6P_BINDV6ONLY; 143 #else 144 in6p->in6p_flags |= IN6P_BINDV6ONLY; /*just for safety*/ 145 #endif 146 so->so_pcb = (caddr_t)in6p; 147 return(0); 148 } 149 150 int 151 in6_pcbbind(in6p, nam, p) 152 struct in6pcb *in6p; 153 struct mbuf *nam; 154 struct proc *p; 155 { 156 struct socket *so = in6p->in6p_socket; 157 struct in6pcb *head = in6p->in6p_head; 158 struct sockaddr_in6 *sin6 = (struct sockaddr_in6 *)NULL; 159 u_int16_t lport = 0; 160 int wild = 0, reuseport = (so->so_options & SO_REUSEPORT); 161 162 if (in6p->in6p_lport || !IN6_IS_ADDR_UNSPECIFIED(&in6p->in6p_laddr)) 163 return(EINVAL); 164 if ((so->so_options & (SO_REUSEADDR|SO_REUSEPORT)) == 0 && 165 ((so->so_proto->pr_flags & PR_CONNREQUIRED) == 0 || 166 (so->so_options & SO_ACCEPTCONN) == 0)) 167 wild = IN6PLOOKUP_WILDCARD; 168 if (nam) { 169 sin6 = mtod(nam, struct sockaddr_in6 *); 170 if (nam->m_len != sizeof(*sin6)) 171 return(EINVAL); 172 /* 173 * We should check the family, but old programs 174 * incorrectly fail to intialize it. 175 */ 176 if (sin6->sin6_family != AF_INET6) 177 return(EAFNOSUPPORT); 178 179 /* 180 * since we do not check port number duplicate with IPv4 space, 181 * we reject it at this moment. If we leave it, we make normal 182 * user to hijack port number from other users. 183 */ 184 if (IN6_IS_ADDR_V4MAPPED(&sin6->sin6_addr)) 185 return(EADDRNOTAVAIL); 186 187 /* KAME hack: embed scopeid */ 188 if (in6_embedscope(&sin6->sin6_addr, sin6, in6p, NULL) != 0) 189 return EINVAL; 190 /* this must be cleared for ifa_ifwithaddr() */ 191 sin6->sin6_scope_id = 0; 192 193 lport = sin6->sin6_port; 194 if (IN6_IS_ADDR_MULTICAST(&sin6->sin6_addr)) { 195 /* 196 * Treat SO_REUSEADDR as SO_REUSEPORT for multicast; 197 * allow compepte duplication of binding if 198 * SO_REUSEPORT is set, or if SO_REUSEADDR is set 199 * and a multicast address is bound on both 200 * new and duplicated sockets. 201 */ 202 if (so->so_options & SO_REUSEADDR) 203 reuseport = SO_REUSEADDR|SO_REUSEPORT; 204 } else if (IN6_IS_ADDR_V4MAPPED(&sin6->sin6_addr)) { 205 struct sockaddr_in sin; 206 207 bzero(&sin, sizeof(sin)); 208 sin.sin_len = sizeof(sin); 209 sin.sin_family = AF_INET; 210 bcopy(&sin6->sin6_addr.s6_addr32[3], &sin.sin_addr, 211 sizeof(sin.sin_addr)); 212 if (ifa_ifwithaddr((struct sockaddr *)&sin) == 0) 213 return EADDRNOTAVAIL; 214 } else if (!IN6_IS_ADDR_UNSPECIFIED(&sin6->sin6_addr)) { 215 struct ifaddr *ia = NULL; 216 217 sin6->sin6_port = 0; /* yech... */ 218 if ((in6p->in6p_flags & IN6P_FAITH) == 0 && 219 (ia = ifa_ifwithaddr((struct sockaddr *)sin6)) == 0) 220 return(EADDRNOTAVAIL); 221 222 /* 223 * XXX: bind to an anycast address might accidentally 224 * cause sending a packet with anycast source address. 225 */ 226 if (ia && 227 ((struct in6_ifaddr *)ia)->ia6_flags & 228 (IN6_IFF_ANYCAST|IN6_IFF_NOTREADY| 229 IN6_IFF_DETACHED|IN6_IFF_DEPRECATED)) { 230 return(EADDRNOTAVAIL); 231 } 232 } 233 if (lport) { 234 #ifndef IPNOPRIVPORTS 235 int priv; 236 237 /* 238 * NOTE: all operating systems use suser() for 239 * privilege check! do not rewrite it into SS_PRIV. 240 */ 241 priv = (p && !suser(p->p_ucred, &p->p_acflag)) ? 1 : 0; 242 /* GROSS */ 243 if (ntohs(lport) < IPV6PORT_RESERVED && !priv) 244 return(EACCES); 245 #endif 246 247 if (IN6_IS_ADDR_V4MAPPED(&sin6->sin6_addr)) { 248 /* should check this but we can't ... */ 249 #if 0 250 struct inpcb *t; 251 252 t = in_pcblookup_bind(&tcbtable, 253 (struct in_addr *)&sin6->sin6_addr.s6_addr32[3], 254 lport); 255 if (t && (reuseport & t->inp_socket->so_options) == 0) 256 return EADDRINUSE; 257 #endif 258 } else { 259 struct in6pcb *t; 260 261 t = in6_pcblookup(head, &zeroin6_addr, 0, 262 &sin6->sin6_addr, lport, wild); 263 if (t && (reuseport & t->in6p_socket->so_options) == 0) 264 return(EADDRINUSE); 265 } 266 } 267 in6p->in6p_laddr = sin6->sin6_addr; 268 } 269 270 if (lport == 0) { 271 int e; 272 if ((e = in6_pcbsetport(&in6p->in6p_laddr, in6p)) != 0) 273 return(e); 274 } 275 else 276 in6p->in6p_lport = lport; 277 278 in6p->in6p_flowinfo = sin6 ? sin6->sin6_flowinfo : 0; /*XXX*/ 279 return(0); 280 } 281 282 /* 283 * Connect from a socket to a specified address. 284 * Both address and port must be specified in argument sin6. 285 * If don't have a local address for this socket yet, 286 * then pick one. 287 */ 288 int 289 in6_pcbconnect(in6p, nam) 290 struct in6pcb *in6p; 291 struct mbuf *nam; 292 { 293 struct in6_addr *in6a = NULL; 294 struct sockaddr_in6 *sin6 = mtod(nam, struct sockaddr_in6 *); 295 struct ifnet *ifp = NULL; /* outgoing interface */ 296 int error = 0; 297 #ifdef INET 298 struct in6_addr mapped; 299 #endif 300 struct sockaddr_in6 tmp; 301 302 (void)&in6a; /* XXX fool gcc */ 303 304 if (nam->m_len != sizeof(*sin6)) 305 return(EINVAL); 306 if (sin6->sin6_family != AF_INET6) 307 return(EAFNOSUPPORT); 308 if (sin6->sin6_port == 0) 309 return(EADDRNOTAVAIL); 310 311 /* sanity check for mapped address case */ 312 if (IN6_IS_ADDR_V4MAPPED(&sin6->sin6_addr)) { 313 if (IN6_IS_ADDR_UNSPECIFIED(&in6p->in6p_laddr)) 314 in6p->in6p_laddr.s6_addr16[5] = htons(0xffff); 315 if (!IN6_IS_ADDR_V4MAPPED(&in6p->in6p_laddr)) 316 return EINVAL; 317 } else { 318 if (IN6_IS_ADDR_V4MAPPED(&in6p->in6p_laddr)) 319 return EINVAL; 320 } 321 322 /* protect *sin6 from overwrites */ 323 tmp = *sin6; 324 sin6 = &tmp; 325 326 /* KAME hack: embed scopeid */ 327 if (in6_embedscope(&sin6->sin6_addr, sin6, in6p, &ifp) != 0) 328 return EINVAL; 329 330 /* Source address selection. */ 331 if (IN6_IS_ADDR_V4MAPPED(&in6p->in6p_laddr) 332 && in6p->in6p_laddr.s6_addr32[3] == 0) { 333 #ifdef INET 334 struct sockaddr_in sin, *sinp; 335 336 bzero(&sin, sizeof(sin)); 337 sin.sin_len = sizeof(sin); 338 sin.sin_family = AF_INET; 339 bcopy(&sin6->sin6_addr.s6_addr32[3], &sin.sin_addr, 340 sizeof(sin.sin_addr)); 341 sinp = in_selectsrc(&sin, (struct route *)&in6p->in6p_route, 342 in6p->in6p_socket->so_options, NULL, &error); 343 if (sinp == 0) { 344 if (error == 0) 345 error = EADDRNOTAVAIL; 346 return(error); 347 } 348 bzero(&mapped, sizeof(mapped)); 349 mapped.s6_addr16[5] = htons(0xffff); 350 bcopy(&sinp->sin_addr, &mapped.s6_addr32[3], sizeof(sinp->sin_addr)); 351 in6a = &mapped; 352 #else 353 return EADDRNOTAVAIL; 354 #endif 355 } else { 356 /* 357 * XXX: in6_selectsrc might replace the bound local address 358 * with the address specified by setsockopt(IPV6_PKTINFO). 359 * Is it the intended behavior? 360 */ 361 in6a = in6_selectsrc(sin6, in6p->in6p_outputopts, 362 in6p->in6p_moptions, 363 &in6p->in6p_route, 364 &in6p->in6p_laddr, &error); 365 if (in6a == 0) { 366 if (error == 0) 367 error = EADDRNOTAVAIL; 368 return(error); 369 } 370 } 371 if (in6p->in6p_route.ro_rt) 372 ifp = in6p->in6p_route.ro_rt->rt_ifp; 373 374 in6p->in6p_ip6.ip6_hlim = (u_int8_t)in6_selecthlim(in6p, ifp); 375 376 if (in6_pcblookup(in6p->in6p_head, 377 &sin6->sin6_addr, 378 sin6->sin6_port, 379 IN6_IS_ADDR_UNSPECIFIED(&in6p->in6p_laddr) ? 380 in6a : &in6p->in6p_laddr, 381 in6p->in6p_lport, 382 0)) 383 return(EADDRINUSE); 384 if (IN6_IS_ADDR_UNSPECIFIED(&in6p->in6p_laddr) 385 || (IN6_IS_ADDR_V4MAPPED(&in6p->in6p_laddr) 386 && in6p->in6p_laddr.s6_addr32[3] == 0)) { 387 if (in6p->in6p_lport == 0) { 388 (void)in6_pcbbind(in6p, (struct mbuf *)0, 389 (struct proc *)0); 390 } 391 in6p->in6p_laddr = *in6a; 392 } 393 in6p->in6p_faddr = sin6->sin6_addr; 394 in6p->in6p_fport = sin6->sin6_port; 395 /* 396 * xxx kazu flowlabel is necessary for connect? 397 * but if this line is missing, the garbage value remains. 398 */ 399 in6p->in6p_flowinfo = sin6->sin6_flowinfo; 400 return(0); 401 } 402 403 void 404 in6_pcbdisconnect(in6p) 405 struct in6pcb *in6p; 406 { 407 bzero((caddr_t)&in6p->in6p_faddr, sizeof(in6p->in6p_faddr)); 408 in6p->in6p_fport = 0; 409 if (in6p->in6p_socket->so_state & SS_NOFDREF) 410 in6_pcbdetach(in6p); 411 } 412 413 void 414 in6_pcbdetach(in6p) 415 struct in6pcb *in6p; 416 { 417 struct socket *so = in6p->in6p_socket; 418 419 #ifdef IPSEC 420 ipsec6_delete_pcbpolicy(in6p); 421 #endif /* IPSEC */ 422 sotoin6pcb(so) = 0; 423 sofree(so); 424 if (in6p->in6p_options) 425 m_freem(in6p->in6p_options); 426 if (in6p->in6p_outputopts) { 427 if (in6p->in6p_outputopts->ip6po_rthdr && 428 in6p->in6p_outputopts->ip6po_route.ro_rt) 429 RTFREE(in6p->in6p_outputopts->ip6po_route.ro_rt); 430 if (in6p->in6p_outputopts->ip6po_m) 431 (void)m_free(in6p->in6p_outputopts->ip6po_m); 432 free(in6p->in6p_outputopts, M_IP6OPT); 433 } 434 if (in6p->in6p_route.ro_rt) 435 rtfree(in6p->in6p_route.ro_rt); 436 ip6_freemoptions(in6p->in6p_moptions); 437 in6p->in6p_next->in6p_prev = in6p->in6p_prev; 438 in6p->in6p_prev->in6p_next = in6p->in6p_next; 439 in6p->in6p_prev = NULL; 440 FREE(in6p, M_PCB); 441 } 442 443 void 444 in6_setsockaddr(in6p, nam) 445 struct in6pcb *in6p; 446 struct mbuf *nam; 447 { 448 struct sockaddr_in6 *sin6; 449 450 nam->m_len = sizeof(*sin6); 451 sin6 = mtod(nam, struct sockaddr_in6 *); 452 bzero((caddr_t)sin6, sizeof(*sin6)); 453 sin6->sin6_family = AF_INET6; 454 sin6->sin6_len = sizeof(struct sockaddr_in6); 455 sin6->sin6_port = in6p->in6p_lport; 456 /* KAME hack: recover scopeid */ 457 (void)in6_recoverscope(sin6, &in6p->in6p_laddr, NULL); 458 } 459 460 void 461 in6_setpeeraddr(in6p, nam) 462 struct in6pcb *in6p; 463 struct mbuf *nam; 464 { 465 struct sockaddr_in6 *sin6; 466 467 nam->m_len = sizeof(*sin6); 468 sin6 = mtod(nam, struct sockaddr_in6 *); 469 bzero((caddr_t)sin6, sizeof(*sin6)); 470 sin6->sin6_family = AF_INET6; 471 sin6->sin6_len = sizeof(struct sockaddr_in6); 472 sin6->sin6_port = in6p->in6p_fport; 473 /* KAME hack: recover scopeid */ 474 (void)in6_recoverscope(sin6, &in6p->in6p_faddr, NULL); 475 } 476 477 /* 478 * Pass some notification to all connections of a protocol 479 * associated with address dst. The local address and/or port numbers 480 * may be specified to limit the search. The "usual action" will be 481 * taken, depending on the ctlinput cmd. The caller must filter any 482 * cmds that are uninteresting (e.g., no error in the map). 483 * Call the protocol specific routine (if any) to report 484 * any errors for each matching socket. 485 * 486 * Must be called at splsoftnet. 487 * 488 * Note: src (4th arg) carries the flowlabel value on the original IPv6 489 * header, in sin6_flowinfo member. 490 */ 491 int 492 in6_pcbnotify(head, dst, fport_arg, src, lport_arg, cmd, cmdarg, notify) 493 struct in6pcb *head; 494 struct sockaddr *dst, *src; 495 u_int fport_arg, lport_arg; 496 int cmd; 497 void *cmdarg; 498 void (*notify) __P((struct in6pcb *, int)); 499 { 500 struct in6pcb *in6p, *nin6p; 501 struct sockaddr_in6 sa6_src, *sa6_dst; 502 u_int16_t fport = fport_arg, lport = lport_arg; 503 int errno; 504 int nmatch = 0; 505 u_int32_t flowinfo; 506 507 if ((unsigned)cmd > PRC_NCMDS || dst->sa_family != AF_INET6) 508 return 0; 509 510 sa6_dst = (struct sockaddr_in6 *)dst; 511 if (IN6_IS_ADDR_UNSPECIFIED(&sa6_dst->sin6_addr)) 512 return 0; 513 514 /* 515 * note that src can be NULL when we get notify by local fragmentation. 516 */ 517 sa6_src = (src == NULL) ? sa6_any : *(struct sockaddr_in6 *)src; 518 flowinfo = sa6_src.sin6_flowinfo; 519 520 /* 521 * Redirects go to all references to the destination, 522 * and use in6_rtchange to invalidate the route cache. 523 * Dead host indications: also use in6_rtchange to invalidate 524 * the cache, and deliver the error to all the sockets. 525 * Otherwise, if we have knowledge of the local port and address, 526 * deliver only to that socket. 527 */ 528 if (PRC_IS_REDIRECT(cmd) || cmd == PRC_HOSTDEAD) { 529 fport = 0; 530 lport = 0; 531 bzero((caddr_t)&sa6_src.sin6_addr, sizeof(sa6_src.sin6_addr)); 532 533 if (cmd != PRC_HOSTDEAD) 534 notify = in6_rtchange; 535 } 536 537 errno = inet6ctlerrmap[cmd]; 538 for (in6p = head->in6p_next; in6p != head; in6p = nin6p) { 539 nin6p = in6p->in6p_next; 540 541 /* 542 * Under the following condition, notify of redirects 543 * to the pcb, without making address matches against inpcb. 544 * - redirect notification is arrived. 545 * - the inpcb is unconnected. 546 * - the inpcb is caching !RTF_HOST routing entry. 547 * - the ICMPv6 notification is from the gateway cached in the 548 * inpcb. i.e. ICMPv6 notification is from nexthop gateway 549 * the inpcb used very recently. 550 * 551 * This is to improve interaction between netbsd/openbsd 552 * redirect handling code, and inpcb route cache code. 553 * without the clause, !RTF_HOST routing entry (which carries 554 * gateway used by inpcb right before the ICMPv6 redirect) 555 * will be cached forever in unconnected inpcb. 556 * 557 * There still is a question regarding to what is TRT: 558 * - On bsdi/freebsd, RTF_HOST (cloned) routing entry will be 559 * generated on packet output. inpcb will always cache 560 * RTF_HOST routing entry so there's no need for the clause 561 * (ICMPv6 redirect will update RTF_HOST routing entry, 562 * and inpcb is caching it already). 563 * However, bsdi/freebsd are vulnerable to local DoS attacks 564 * due to the cloned routing entries. 565 * - Specwise, "destination cache" is mentioned in RFC2461. 566 * Jinmei says that it implies bsdi/freebsd behavior, itojun 567 * is not really convinced. 568 * - Having hiwat/lowat on # of cloned host route (redirect/ 569 * pmtud) may be a good idea. netbsd/openbsd has it. see 570 * icmp6_mtudisc_update(). 571 */ 572 if ((PRC_IS_REDIRECT(cmd) || cmd == PRC_HOSTDEAD) && 573 IN6_IS_ADDR_UNSPECIFIED(&in6p->in6p_laddr) && 574 in6p->in6p_route.ro_rt && 575 !(in6p->in6p_route.ro_rt->rt_flags & RTF_HOST)) { 576 struct sockaddr_in6 *dst6; 577 578 dst6 = (struct sockaddr_in6 *)&in6p->in6p_route.ro_dst; 579 if (IN6_ARE_ADDR_EQUAL(&dst6->sin6_addr, 580 &sa6_dst->sin6_addr)) 581 goto do_notify; 582 } 583 584 /* 585 * Detect if we should notify the error. If no source and 586 * destination ports are specifed, but non-zero flowinfo and 587 * local address match, notify the error. This is the case 588 * when the error is delivered with an encrypted buffer 589 * by ESP. Otherwise, just compare addresses and ports 590 * as usual. 591 */ 592 if (lport == 0 && fport == 0 && flowinfo && 593 in6p->in6p_socket != NULL && 594 flowinfo == (in6p->in6p_flowinfo & IPV6_FLOWLABEL_MASK) && 595 IN6_ARE_ADDR_EQUAL(&in6p->in6p_laddr, &sa6_src.sin6_addr)) 596 goto do_notify; 597 else if (!IN6_ARE_ADDR_EQUAL(&in6p->in6p_faddr, 598 &sa6_dst->sin6_addr) || 599 in6p->in6p_socket == 0 || 600 (lport && in6p->in6p_lport != lport) || 601 (!IN6_IS_ADDR_UNSPECIFIED(&sa6_src.sin6_addr) && 602 !IN6_ARE_ADDR_EQUAL(&in6p->in6p_laddr, 603 &sa6_src.sin6_addr)) || 604 (fport && in6p->in6p_fport != fport)) 605 continue; 606 607 do_notify: 608 if (notify) 609 (*notify)(in6p, errno); 610 nmatch++; 611 } 612 return nmatch; 613 } 614 615 void 616 in6_pcbpurgeif0(head, ifp) 617 struct in6pcb *head; 618 struct ifnet *ifp; 619 { 620 struct in6pcb *in6p, *nin6p; 621 struct ip6_moptions *im6o; 622 struct in6_multi_mship *imm, *nimm; 623 624 for (in6p = head->in6p_next; in6p != head; in6p = nin6p) { 625 nin6p = in6p->in6p_next; 626 im6o = in6p->in6p_moptions; 627 if (im6o) { 628 /* 629 * Unselect the outgoing interface if it is being 630 * detached. 631 */ 632 if (im6o->im6o_multicast_ifp == ifp) 633 im6o->im6o_multicast_ifp = NULL; 634 635 /* 636 * Drop multicast group membership if we joined 637 * through the interface being detached. 638 * XXX controversial - is it really legal for kernel 639 * to force this? 640 */ 641 for (imm = im6o->im6o_memberships.lh_first; 642 imm != NULL; imm = nimm) { 643 nimm = imm->i6mm_chain.le_next; 644 if (imm->i6mm_maddr->in6m_ifp == ifp) { 645 LIST_REMOVE(imm, i6mm_chain); 646 in6_delmulti(imm->i6mm_maddr); 647 free(imm, M_IPMADDR); 648 } 649 } 650 } 651 } 652 } 653 654 void 655 in6_pcbpurgeif(head, ifp) 656 struct in6pcb *head; 657 struct ifnet *ifp; 658 { 659 struct in6pcb *in6p, *nin6p; 660 661 for (in6p = head->in6p_next; in6p != head; in6p = nin6p) { 662 nin6p = in6p->in6p_next; 663 if (in6p->in6p_route.ro_rt != NULL && 664 in6p->in6p_route.ro_rt->rt_ifp == ifp) 665 in6_rtchange(in6p, 0); 666 } 667 } 668 669 /* 670 * Check for alternatives when higher level complains 671 * about service problems. For now, invalidate cached 672 * routing information. If the route was created dynamically 673 * (by a redirect), time to try a default gateway again. 674 */ 675 void 676 in6_losing(in6p) 677 struct in6pcb *in6p; 678 { 679 struct rtentry *rt; 680 struct rt_addrinfo info; 681 682 if ((rt = in6p->in6p_route.ro_rt) != NULL) { 683 in6p->in6p_route.ro_rt = 0; 684 bzero((caddr_t)&info, sizeof(info)); 685 info.rti_info[RTAX_DST] = 686 (struct sockaddr *)&in6p->in6p_route.ro_dst; 687 info.rti_info[RTAX_GATEWAY] = rt->rt_gateway; 688 info.rti_info[RTAX_NETMASK] = rt_mask(rt); 689 rt_missmsg(RTM_LOSING, &info, rt->rt_flags, 0); 690 if (rt->rt_flags & RTF_DYNAMIC) 691 (void)rtrequest(RTM_DELETE, rt_key(rt), 692 rt->rt_gateway, rt_mask(rt), rt->rt_flags, 693 (struct rtentry **)0); 694 else 695 /* 696 * A new route can be allocated 697 * the next time output is attempted. 698 */ 699 rtfree(rt); 700 } 701 } 702 703 /* 704 * After a routing change, flush old routing 705 * and allocate a (hopefully) better one. 706 */ 707 void 708 in6_rtchange(in6p, errno) 709 struct in6pcb *in6p; 710 int errno; 711 { 712 if (in6p->in6p_route.ro_rt) { 713 rtfree(in6p->in6p_route.ro_rt); 714 in6p->in6p_route.ro_rt = 0; 715 /* 716 * A new route can be allocated the next time 717 * output is attempted. 718 */ 719 } 720 } 721 722 struct in6pcb * 723 in6_pcblookup(head, faddr6, fport_arg, laddr6, lport_arg, flags) 724 struct in6pcb *head; 725 struct in6_addr *faddr6, *laddr6; 726 u_int fport_arg, lport_arg; 727 int flags; 728 { 729 struct in6pcb *in6p, *match = 0; 730 int matchwild = 3, wildcard; 731 u_int16_t fport = fport_arg, lport = lport_arg; 732 733 for (in6p = head->in6p_next; in6p != head; in6p = in6p->in6p_next) { 734 if (in6p->in6p_lport != lport) 735 continue; 736 wildcard = 0; 737 if (!IN6_IS_ADDR_UNSPECIFIED(&in6p->in6p_laddr)) { 738 if (IN6_IS_ADDR_UNSPECIFIED(laddr6)) 739 wildcard++; 740 else if (!IN6_ARE_ADDR_EQUAL(&in6p->in6p_laddr, laddr6)) 741 continue; 742 } 743 else if (IN6_IS_ADDR_V4MAPPED(&in6p->in6p_laddr) 744 && in6p->in6p_laddr.s6_addr32[3] == 0) { 745 if (!IN6_IS_ADDR_V4MAPPED(laddr6)) 746 continue; 747 if (laddr6->s6_addr32[3] == 0) 748 ; 749 else 750 wildcard++; 751 } 752 else { 753 if (IN6_IS_ADDR_V4MAPPED(laddr6)) { 754 #ifndef INET6_BINDV6ONLY 755 if (in6p->in6p_flags & IN6P_BINDV6ONLY) 756 continue; 757 else 758 wildcard++; 759 #else 760 continue; 761 #endif 762 } else if (!IN6_IS_ADDR_UNSPECIFIED(laddr6)) 763 wildcard++; 764 } 765 if (!IN6_IS_ADDR_UNSPECIFIED(&in6p->in6p_faddr)) { 766 if (IN6_IS_ADDR_UNSPECIFIED(faddr6)) 767 wildcard++; 768 else if (!IN6_ARE_ADDR_EQUAL(&in6p->in6p_faddr, faddr6) 769 || in6p->in6p_fport != fport) 770 continue; 771 } 772 else if (IN6_IS_ADDR_V4MAPPED(&in6p->in6p_faddr) 773 && in6p->in6p_faddr.s6_addr32[3] == 0) { 774 if (!IN6_IS_ADDR_V4MAPPED(faddr6)) 775 continue; 776 if (faddr6->s6_addr32[3] == 0) 777 ; 778 else 779 wildcard++; 780 } 781 else { 782 if (IN6_IS_ADDR_V4MAPPED(faddr6)) { 783 #ifndef INET6_BINDV6ONLY 784 if (in6p->in6p_flags & IN6P_BINDV6ONLY) 785 continue; 786 else 787 wildcard++; 788 #else 789 continue; 790 #endif 791 } else if (!IN6_IS_ADDR_UNSPECIFIED(faddr6)) 792 wildcard++; 793 } 794 795 if (wildcard && (flags & IN6PLOOKUP_WILDCARD) == 0) 796 continue; 797 if (wildcard < matchwild) { 798 match = in6p; 799 matchwild = wildcard; 800 if (matchwild == 0) 801 break; 802 } 803 } 804 return(match); 805 } 806 807 struct rtentry * 808 in6_pcbrtentry(in6p) 809 struct in6pcb *in6p; 810 { 811 struct route_in6 *ro; 812 struct sockaddr_in6 *dst6; 813 814 ro = &in6p->in6p_route; 815 dst6 = (struct sockaddr_in6 *)&ro->ro_dst; 816 817 if (ro->ro_rt == NULL) { 818 /* 819 * No route yet, so try to acquire one. 820 */ 821 if (!IN6_IS_ADDR_UNSPECIFIED(&in6p->in6p_faddr)) { 822 bzero(dst6, sizeof(*dst6)); 823 dst6->sin6_family = AF_INET6; 824 dst6->sin6_len = sizeof(struct sockaddr_in6); 825 dst6->sin6_addr = in6p->in6p_faddr; 826 rtalloc((struct route *)ro); 827 } 828 } 829 return (ro->ro_rt); 830 } 831 832 struct in6pcb * 833 in6_pcblookup_connect(head, faddr6, fport_arg, laddr6, lport_arg, faith) 834 struct in6pcb *head; 835 struct in6_addr *faddr6, *laddr6; 836 u_int fport_arg, lport_arg; 837 int faith; 838 { 839 struct in6pcb *in6p; 840 u_int16_t fport = fport_arg, lport = lport_arg; 841 842 for (in6p = head->in6p_next; in6p != head; in6p = in6p->in6p_next) { 843 /* find exact match on both source and dest */ 844 if (in6p->in6p_fport != fport) 845 continue; 846 if (in6p->in6p_lport != lport) 847 continue; 848 if (IN6_IS_ADDR_UNSPECIFIED(&in6p->in6p_faddr)) 849 continue; 850 if (!IN6_ARE_ADDR_EQUAL(&in6p->in6p_faddr, faddr6)) 851 continue; 852 if (IN6_IS_ADDR_UNSPECIFIED(&in6p->in6p_laddr)) 853 continue; 854 if (!IN6_ARE_ADDR_EQUAL(&in6p->in6p_laddr, laddr6)) 855 continue; 856 return in6p; 857 } 858 return NULL; 859 } 860 861 struct in6pcb * 862 in6_pcblookup_bind(head, laddr6, lport_arg, faith) 863 struct in6pcb *head; 864 struct in6_addr *laddr6; 865 u_int lport_arg; 866 int faith; 867 { 868 struct in6pcb *in6p, *match; 869 u_int16_t lport = lport_arg; 870 871 match = NULL; 872 for (in6p = head->in6p_next; in6p != head; in6p = in6p->in6p_next) { 873 /* 874 * find destination match. exact match is preferred 875 * against wildcard match. 876 */ 877 if (faith && (in6p->in6p_flags & IN6P_FAITH) == 0) 878 continue; 879 if (in6p->in6p_fport != 0) 880 continue; 881 if (in6p->in6p_lport != lport) 882 continue; 883 if (IN6_IS_ADDR_UNSPECIFIED(&in6p->in6p_laddr)) { 884 if (IN6_IS_ADDR_V4MAPPED(laddr6)) { 885 #ifndef INET6_BINDV6ONLY 886 if (in6p->in6p_flags & IN6P_BINDV6ONLY) 887 continue; 888 else 889 match = in6p; 890 #else 891 continue; 892 #endif 893 } else 894 match = in6p; 895 } 896 else if (IN6_IS_ADDR_V4MAPPED(&in6p->in6p_laddr) && 897 in6p->in6p_laddr.s6_addr32[3] == 0) { 898 if (IN6_IS_ADDR_V4MAPPED(laddr6) && 899 laddr6->s6_addr32[3] != 0) 900 match = in6p; 901 } 902 else if (IN6_ARE_ADDR_EQUAL(&in6p->in6p_laddr, laddr6)) 903 return in6p; 904 } 905 return match; 906 } 907
Indexes created Thu Sep 25 16:09:42 GMT 2025