in6_pcb.c revision 1.38.2.3
1 /* $NetBSD: in6_pcb.c,v 1.38.2.3 2002/01/10 20:03:16 thorpej 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 <sys/cdefs.h> 69 __KERNEL_RCSID(0, "$NetBSD: in6_pcb.c,v 1.38.2.3 2002/01/10 20:03:16 thorpej Exp $"); 70 71 #include "opt_ipsec.h" 72 73 #include <sys/param.h> 74 #include <sys/systm.h> 75 #include <sys/malloc.h> 76 #include <sys/mbuf.h> 77 #include <sys/protosw.h> 78 #include <sys/socket.h> 79 #include <sys/socketvar.h> 80 #include <sys/ioctl.h> 81 #include <sys/errno.h> 82 #include <sys/time.h> 83 #include <sys/proc.h> 84 85 #include <net/if.h> 86 #include <net/route.h> 87 88 #include <netinet/in.h> 89 #include <netinet/in_var.h> 90 #include <netinet/in_systm.h> 91 #include <netinet/ip.h> 92 #include <netinet/in_pcb.h> 93 #include <netinet/ip6.h> 94 #include <netinet6/ip6_var.h> 95 #include <netinet6/in6_pcb.h> 96 #include <netinet6/nd6.h> 97 98 #include "loop.h" 99 extern struct ifnet loif[NLOOP]; 100 #include "faith.h" 101 102 #ifdef IPSEC 103 #include <netinet6/ipsec.h> 104 #include <netkey/key.h> 105 #endif /* IPSEC */ 106 107 struct in6_addr zeroin6_addr; 108 109 int ip6_anonportmin = IPV6PORT_ANONMIN; 110 int ip6_anonportmax = IPV6PORT_ANONMAX; 111 int ip6_lowportmin = IPV6PORT_RESERVEDMIN; 112 int ip6_lowportmax = IPV6PORT_RESERVEDMAX; 113 114 int 115 in6_pcballoc(so, head) 116 struct socket *so; 117 struct in6pcb *head; 118 { 119 struct in6pcb *in6p; 120 #ifdef IPSEC 121 int error; 122 #endif 123 124 MALLOC(in6p, struct in6pcb *, sizeof(*in6p), M_PCB, M_NOWAIT); 125 if (in6p == NULL) 126 return(ENOBUFS); 127 bzero((caddr_t)in6p, sizeof(*in6p)); 128 in6p->in6p_head = head; 129 in6p->in6p_socket = so; 130 in6p->in6p_hops = -1; /* use kernel default */ 131 in6p->in6p_icmp6filt = NULL; 132 #ifdef IPSEC 133 error = ipsec_init_policy(so, &in6p->in6p_sp); 134 if (error != 0) { 135 FREE(in6p, M_PCB); 136 return error; 137 } 138 #endif /* IPSEC */ 139 in6p->in6p_next = head->in6p_next; 140 head->in6p_next = in6p; 141 in6p->in6p_prev = head; 142 in6p->in6p_next->in6p_prev = in6p; 143 if (ip6_v6only) 144 in6p->in6p_flags |= IN6P_IPV6_V6ONLY; 145 so->so_pcb = (caddr_t)in6p; 146 return(0); 147 } 148 149 int 150 in6_pcbbind(in6p, nam, p) 151 struct in6pcb *in6p; 152 struct mbuf *nam; 153 struct proc *p; 154 { 155 struct socket *so = in6p->in6p_socket; 156 struct in6pcb *head = in6p->in6p_head; 157 struct sockaddr_in6 *sin6 = (struct sockaddr_in6 *)NULL; 158 u_int16_t lport = 0; 159 int wild = 0, reuseport = (so->so_options & SO_REUSEPORT); 160 161 if (in6p->in6p_lport || !IN6_IS_ADDR_UNSPECIFIED(&in6p->in6p_laddr)) 162 return(EINVAL); 163 if ((so->so_options & (SO_REUSEADDR|SO_REUSEPORT)) == 0 && 164 ((so->so_proto->pr_flags & PR_CONNREQUIRED) == 0 || 165 (so->so_options & SO_ACCEPTCONN) == 0)) 166 wild = IN6PLOOKUP_WILDCARD; 167 if (nam) { 168 sin6 = mtod(nam, struct sockaddr_in6 *); 169 if (nam->m_len != sizeof(*sin6)) 170 return(EINVAL); 171 /* 172 * We should check the family, but old programs 173 * incorrectly fail to intialize it. 174 */ 175 if (sin6->sin6_family != AF_INET6) 176 return(EAFNOSUPPORT); 177 178 /* 179 * since we do not check port number duplicate with IPv4 space, 180 * we reject it at this moment. If we leave it, we would 181 * mistakenly allow normal users to hijack tcp/udp ports from 182 * 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 } 205 else if (IN6_IS_ADDR_V4MAPPED(&sin6->sin6_addr)) { 206 struct sockaddr_in sin; 207 208 bzero(&sin, sizeof(sin)); 209 sin.sin_len = sizeof(sin); 210 sin.sin_family = AF_INET; 211 bcopy(&sin6->sin6_addr.s6_addr32[3], &sin.sin_addr, 212 sizeof(sin.sin_addr)); 213 if (ifa_ifwithaddr((struct sockaddr *)&sin) == 0) 214 return EADDRNOTAVAIL; 215 } 216 else if (!IN6_IS_ADDR_UNSPECIFIED(&sin6->sin6_addr)) { 217 struct ifaddr *ia = NULL; 218 219 sin6->sin6_port = 0; /* yech... */ 220 if ((in6p->in6p_flags & IN6P_FAITH) == 0 && 221 (ia = ifa_ifwithaddr((struct sockaddr *)sin6)) == 0) 222 return(EADDRNOTAVAIL); 223 224 /* 225 * bind to an anycast address might accidentally 226 * cause sending a packet with an anycast source 227 * address, so we forbid it. 228 */ 229 if (ia && 230 ((struct in6_ifaddr *)ia)->ia6_flags & 231 (IN6_IFF_ANYCAST|IN6_IFF_NOTREADY| 232 IN6_IFF_DETACHED|IN6_IFF_DEPRECATED)) { 233 return(EADDRNOTAVAIL); 234 } 235 } 236 if (lport) { 237 #ifndef IPNOPRIVPORTS 238 int priv; 239 240 /* 241 * NOTE: all operating systems use suser() for 242 * privilege check! do not rewrite it into SS_PRIV. 243 */ 244 priv = (p && !suser(p->p_ucred, &p->p_acflag)) ? 1 : 0; 245 /* GROSS */ 246 if (ntohs(lport) < IPV6PORT_RESERVED && !priv) 247 return(EACCES); 248 #endif 249 250 if (IN6_IS_ADDR_V4MAPPED(&sin6->sin6_addr)) { 251 /* should check this but we can't ... */ 252 #if 0 253 struct inpcb *t; 254 255 t = in_pcblookup_bind(&tcbtable, 256 (struct in_addr *)&sin6->sin6_addr.s6_addr32[3], 257 lport); 258 if (t && (reuseport & t->inp_socket->so_options) == 0) 259 return EADDRINUSE; 260 #endif 261 } else 262 { 263 struct in6pcb *t; 264 265 t = in6_pcblookup(head, &zeroin6_addr, 0, 266 &sin6->sin6_addr, lport, wild); 267 if (t && (reuseport & t->in6p_socket->so_options) == 0) 268 return(EADDRINUSE); 269 } 270 } 271 in6p->in6p_laddr = sin6->sin6_addr; 272 } 273 274 if (lport == 0) { 275 int e; 276 if ((e = in6_pcbsetport(&in6p->in6p_laddr, in6p)) != 0) 277 return(e); 278 } 279 else 280 in6p->in6p_lport = lport; 281 282 in6p->in6p_flowinfo = sin6 ? sin6->sin6_flowinfo : 0; /*XXX*/ 283 return(0); 284 } 285 286 /* 287 * Connect from a socket to a specified address. 288 * Both address and port must be specified in argument sin6. 289 * If don't have a local address for this socket yet, 290 * then pick one. 291 */ 292 int 293 in6_pcbconnect(in6p, nam) 294 struct in6pcb *in6p; 295 struct mbuf *nam; 296 { 297 struct in6_addr *in6a = NULL; 298 struct sockaddr_in6 *sin6 = mtod(nam, struct sockaddr_in6 *); 299 struct ifnet *ifp = NULL; /* outgoing interface */ 300 int error = 0; 301 #ifdef INET 302 struct in6_addr mapped; 303 #endif 304 struct sockaddr_in6 tmp; 305 306 (void)&in6a; /* XXX fool gcc */ 307 308 if (nam->m_len != sizeof(*sin6)) 309 return(EINVAL); 310 if (sin6->sin6_family != AF_INET6) 311 return(EAFNOSUPPORT); 312 if (sin6->sin6_port == 0) 313 return(EADDRNOTAVAIL); 314 315 /* sanity check for mapped address case */ 316 if (IN6_IS_ADDR_V4MAPPED(&sin6->sin6_addr)) { 317 if ((in6p->in6p_flags & IN6P_IPV6_V6ONLY) != 0) 318 return EINVAL; 319 if (IN6_IS_ADDR_UNSPECIFIED(&in6p->in6p_laddr)) 320 in6p->in6p_laddr.s6_addr16[5] = htons(0xffff); 321 if (!IN6_IS_ADDR_V4MAPPED(&in6p->in6p_laddr)) 322 return EINVAL; 323 } else 324 { 325 if (IN6_IS_ADDR_V4MAPPED(&in6p->in6p_laddr)) 326 return EINVAL; 327 } 328 329 /* protect *sin6 from overwrites */ 330 tmp = *sin6; 331 sin6 = &tmp; 332 333 /* KAME hack: embed scopeid */ 334 if (in6_embedscope(&sin6->sin6_addr, sin6, in6p, &ifp) != 0) 335 return EINVAL; 336 337 /* Source address selection. */ 338 if (IN6_IS_ADDR_V4MAPPED(&in6p->in6p_laddr) 339 && in6p->in6p_laddr.s6_addr32[3] == 0) { 340 #ifdef INET 341 struct sockaddr_in sin, *sinp; 342 343 bzero(&sin, sizeof(sin)); 344 sin.sin_len = sizeof(sin); 345 sin.sin_family = AF_INET; 346 bcopy(&sin6->sin6_addr.s6_addr32[3], &sin.sin_addr, 347 sizeof(sin.sin_addr)); 348 sinp = in_selectsrc(&sin, (struct route *)&in6p->in6p_route, 349 in6p->in6p_socket->so_options, NULL, &error); 350 if (sinp == 0) { 351 if (error == 0) 352 error = EADDRNOTAVAIL; 353 return(error); 354 } 355 bzero(&mapped, sizeof(mapped)); 356 mapped.s6_addr16[5] = htons(0xffff); 357 bcopy(&sinp->sin_addr, &mapped.s6_addr32[3], sizeof(sinp->sin_addr)); 358 in6a = &mapped; 359 #else 360 return EADDRNOTAVAIL; 361 #endif 362 } else 363 { 364 /* 365 * XXX: in6_selectsrc might replace the bound local address 366 * with the address specified by setsockopt(IPV6_PKTINFO). 367 * Is it the intended behavior? 368 */ 369 in6a = in6_selectsrc(sin6, in6p->in6p_outputopts, 370 in6p->in6p_moptions, 371 &in6p->in6p_route, 372 &in6p->in6p_laddr, &error); 373 if (in6a == 0) { 374 if (error == 0) 375 error = EADDRNOTAVAIL; 376 return(error); 377 } 378 } 379 if (in6p->in6p_route.ro_rt) 380 ifp = in6p->in6p_route.ro_rt->rt_ifp; 381 382 in6p->in6p_ip6.ip6_hlim = (u_int8_t)in6_selecthlim(in6p, ifp); 383 384 if (in6_pcblookup(in6p->in6p_head, 385 &sin6->sin6_addr, 386 sin6->sin6_port, 387 IN6_IS_ADDR_UNSPECIFIED(&in6p->in6p_laddr) ? 388 in6a : &in6p->in6p_laddr, 389 in6p->in6p_lport, 390 0)) 391 return(EADDRINUSE); 392 if (IN6_IS_ADDR_UNSPECIFIED(&in6p->in6p_laddr) 393 || (IN6_IS_ADDR_V4MAPPED(&in6p->in6p_laddr) 394 && in6p->in6p_laddr.s6_addr32[3] == 0)) 395 { 396 /* 397 * XXX in IPv4 mapped address case, we should grab fresh 398 * local port number by in_pcbbind, not in6_pcbbind. 399 * if we are in bad luck, we may assign conflicting port number 400 * between IPv4 and IPv6 unwillingly. 401 */ 402 if (in6p->in6p_lport == 0) { 403 (void)in6_pcbbind(in6p, (struct mbuf *)0, 404 (struct proc *)0); 405 } 406 in6p->in6p_laddr = *in6a; 407 } 408 in6p->in6p_faddr = sin6->sin6_addr; 409 in6p->in6p_fport = sin6->sin6_port; 410 /* 411 * xxx kazu flowlabel is necessary for connect? 412 * but if this line is missing, the garbage value remains. 413 */ 414 in6p->in6p_flowinfo = sin6->sin6_flowinfo; 415 #ifdef IPSEC 416 if (in6p->in6p_socket->so_type == SOCK_STREAM) 417 ipsec_pcbconn(in6p->in6p_sp); 418 #endif 419 return(0); 420 } 421 422 void 423 in6_pcbdisconnect(in6p) 424 struct in6pcb *in6p; 425 { 426 bzero((caddr_t)&in6p->in6p_faddr, sizeof(in6p->in6p_faddr)); 427 in6p->in6p_fport = 0; 428 if (in6p->in6p_socket->so_state & SS_NOFDREF) 429 in6_pcbdetach(in6p); 430 #ifdef IPSEC 431 ipsec_pcbdisconn(in6p->in6p_sp); 432 #endif 433 } 434 435 void 436 in6_pcbdetach(in6p) 437 struct in6pcb *in6p; 438 { 439 struct socket *so = in6p->in6p_socket; 440 441 #ifdef IPSEC 442 ipsec6_delete_pcbpolicy(in6p); 443 #endif /* IPSEC */ 444 sotoin6pcb(so) = 0; 445 sofree(so); 446 if (in6p->in6p_options) 447 m_freem(in6p->in6p_options); 448 if (in6p->in6p_outputopts) { 449 if (in6p->in6p_outputopts->ip6po_rthdr && 450 in6p->in6p_outputopts->ip6po_route.ro_rt) 451 RTFREE(in6p->in6p_outputopts->ip6po_route.ro_rt); 452 if (in6p->in6p_outputopts->ip6po_m) 453 (void)m_free(in6p->in6p_outputopts->ip6po_m); 454 free(in6p->in6p_outputopts, M_IP6OPT); 455 } 456 if (in6p->in6p_route.ro_rt) 457 rtfree(in6p->in6p_route.ro_rt); 458 ip6_freemoptions(in6p->in6p_moptions); 459 in6p->in6p_next->in6p_prev = in6p->in6p_prev; 460 in6p->in6p_prev->in6p_next = in6p->in6p_next; 461 in6p->in6p_prev = NULL; 462 FREE(in6p, M_PCB); 463 } 464 465 void 466 in6_setsockaddr(in6p, nam) 467 struct in6pcb *in6p; 468 struct mbuf *nam; 469 { 470 struct sockaddr_in6 *sin6; 471 472 nam->m_len = sizeof(*sin6); 473 sin6 = mtod(nam, struct sockaddr_in6 *); 474 bzero((caddr_t)sin6, sizeof(*sin6)); 475 sin6->sin6_family = AF_INET6; 476 sin6->sin6_len = sizeof(struct sockaddr_in6); 477 sin6->sin6_port = in6p->in6p_lport; 478 /* KAME hack: recover scopeid */ 479 (void)in6_recoverscope(sin6, &in6p->in6p_laddr, NULL); 480 } 481 482 void 483 in6_setpeeraddr(in6p, nam) 484 struct in6pcb *in6p; 485 struct mbuf *nam; 486 { 487 struct sockaddr_in6 *sin6; 488 489 nam->m_len = sizeof(*sin6); 490 sin6 = mtod(nam, struct sockaddr_in6 *); 491 bzero((caddr_t)sin6, sizeof(*sin6)); 492 sin6->sin6_family = AF_INET6; 493 sin6->sin6_len = sizeof(struct sockaddr_in6); 494 sin6->sin6_port = in6p->in6p_fport; 495 /* KAME hack: recover scopeid */ 496 (void)in6_recoverscope(sin6, &in6p->in6p_faddr, NULL); 497 } 498 499 /* 500 * Pass some notification to all connections of a protocol 501 * associated with address dst. The local address and/or port numbers 502 * may be specified to limit the search. The "usual action" will be 503 * taken, depending on the ctlinput cmd. The caller must filter any 504 * cmds that are uninteresting (e.g., no error in the map). 505 * Call the protocol specific routine (if any) to report 506 * any errors for each matching socket. 507 * 508 * Must be called at splsoftnet. 509 * 510 * Note: src (4th arg) carries the flowlabel value on the original IPv6 511 * header, in sin6_flowinfo member. 512 */ 513 int 514 in6_pcbnotify(head, dst, fport_arg, src, lport_arg, cmd, cmdarg, notify) 515 struct in6pcb *head; 516 struct sockaddr *dst, *src; 517 u_int fport_arg, lport_arg; 518 int cmd; 519 void *cmdarg; 520 void (*notify) __P((struct in6pcb *, int)); 521 { 522 struct in6pcb *in6p, *nin6p; 523 struct sockaddr_in6 sa6_src, *sa6_dst; 524 u_int16_t fport = fport_arg, lport = lport_arg; 525 int errno; 526 int nmatch = 0; 527 u_int32_t flowinfo; 528 529 if ((unsigned)cmd > PRC_NCMDS || dst->sa_family != AF_INET6) 530 return 0; 531 532 sa6_dst = (struct sockaddr_in6 *)dst; 533 if (IN6_IS_ADDR_UNSPECIFIED(&sa6_dst->sin6_addr)) 534 return 0; 535 536 /* 537 * note that src can be NULL when we get notify by local fragmentation. 538 */ 539 sa6_src = (src == NULL) ? sa6_any : *(struct sockaddr_in6 *)src; 540 flowinfo = sa6_src.sin6_flowinfo; 541 542 /* 543 * Redirects go to all references to the destination, 544 * and use in6_rtchange to invalidate the route cache. 545 * Dead host indications: also use in6_rtchange to invalidate 546 * the cache, and deliver the error to all the sockets. 547 * Otherwise, if we have knowledge of the local port and address, 548 * deliver only to that socket. 549 */ 550 if (PRC_IS_REDIRECT(cmd) || cmd == PRC_HOSTDEAD) { 551 fport = 0; 552 lport = 0; 553 bzero((caddr_t)&sa6_src.sin6_addr, sizeof(sa6_src.sin6_addr)); 554 555 if (cmd != PRC_HOSTDEAD) 556 notify = in6_rtchange; 557 } 558 559 errno = inet6ctlerrmap[cmd]; 560 for (in6p = head->in6p_next; in6p != head; in6p = nin6p) { 561 nin6p = in6p->in6p_next; 562 563 /* 564 * Under the following condition, notify of redirects 565 * to the pcb, without making address matches against inpcb. 566 * - redirect notification is arrived. 567 * - the inpcb is unconnected. 568 * - the inpcb is caching !RTF_HOST routing entry. 569 * - the ICMPv6 notification is from the gateway cached in the 570 * inpcb. i.e. ICMPv6 notification is from nexthop gateway 571 * the inpcb used very recently. 572 * 573 * This is to improve interaction between netbsd/openbsd 574 * redirect handling code, and inpcb route cache code. 575 * without the clause, !RTF_HOST routing entry (which carries 576 * gateway used by inpcb right before the ICMPv6 redirect) 577 * will be cached forever in unconnected inpcb. 578 * 579 * There still is a question regarding to what is TRT: 580 * - On bsdi/freebsd, RTF_HOST (cloned) routing entry will be 581 * generated on packet output. inpcb will always cache 582 * RTF_HOST routing entry so there's no need for the clause 583 * (ICMPv6 redirect will update RTF_HOST routing entry, 584 * and inpcb is caching it already). 585 * However, bsdi/freebsd are vulnerable to local DoS attacks 586 * due to the cloned routing entries. 587 * - Specwise, "destination cache" is mentioned in RFC2461. 588 * Jinmei says that it implies bsdi/freebsd behavior, itojun 589 * is not really convinced. 590 * - Having hiwat/lowat on # of cloned host route (redirect/ 591 * pmtud) may be a good idea. netbsd/openbsd has it. see 592 * icmp6_mtudisc_update(). 593 */ 594 if ((PRC_IS_REDIRECT(cmd) || cmd == PRC_HOSTDEAD) && 595 IN6_IS_ADDR_UNSPECIFIED(&in6p->in6p_laddr) && 596 in6p->in6p_route.ro_rt && 597 !(in6p->in6p_route.ro_rt->rt_flags & RTF_HOST)) { 598 struct sockaddr_in6 *dst6; 599 600 dst6 = (struct sockaddr_in6 *)&in6p->in6p_route.ro_dst; 601 if (IN6_ARE_ADDR_EQUAL(&dst6->sin6_addr, 602 &sa6_dst->sin6_addr)) 603 goto do_notify; 604 } 605 606 /* 607 * Detect if we should notify the error. If no source and 608 * destination ports are specified, but non-zero flowinfo and 609 * local address match, notify the error. This is the case 610 * when the error is delivered with an encrypted buffer 611 * by ESP. Otherwise, just compare addresses and ports 612 * as usual. 613 */ 614 if (lport == 0 && fport == 0 && flowinfo && 615 in6p->in6p_socket != NULL && 616 flowinfo == (in6p->in6p_flowinfo & IPV6_FLOWLABEL_MASK) && 617 IN6_ARE_ADDR_EQUAL(&in6p->in6p_laddr, &sa6_src.sin6_addr)) 618 goto do_notify; 619 else if (!IN6_ARE_ADDR_EQUAL(&in6p->in6p_faddr, 620 &sa6_dst->sin6_addr) || 621 in6p->in6p_socket == 0 || 622 (lport && in6p->in6p_lport != lport) || 623 (!IN6_IS_ADDR_UNSPECIFIED(&sa6_src.sin6_addr) && 624 !IN6_ARE_ADDR_EQUAL(&in6p->in6p_laddr, 625 &sa6_src.sin6_addr)) || 626 (fport && in6p->in6p_fport != fport)) 627 continue; 628 629 do_notify: 630 if (notify) 631 (*notify)(in6p, errno); 632 nmatch++; 633 } 634 return nmatch; 635 } 636 637 void 638 in6_pcbpurgeif0(head, ifp) 639 struct in6pcb *head; 640 struct ifnet *ifp; 641 { 642 struct in6pcb *in6p, *nin6p; 643 struct ip6_moptions *im6o; 644 struct in6_multi_mship *imm, *nimm; 645 646 for (in6p = head->in6p_next; in6p != head; in6p = nin6p) { 647 nin6p = in6p->in6p_next; 648 im6o = in6p->in6p_moptions; 649 if (im6o) { 650 /* 651 * Unselect the outgoing interface if it is being 652 * detached. 653 */ 654 if (im6o->im6o_multicast_ifp == ifp) 655 im6o->im6o_multicast_ifp = NULL; 656 657 /* 658 * Drop multicast group membership if we joined 659 * through the interface being detached. 660 * XXX controversial - is it really legal for kernel 661 * to force this? 662 */ 663 for (imm = im6o->im6o_memberships.lh_first; 664 imm != NULL; imm = nimm) { 665 nimm = imm->i6mm_chain.le_next; 666 if (imm->i6mm_maddr->in6m_ifp == ifp) { 667 LIST_REMOVE(imm, i6mm_chain); 668 in6_leavegroup(imm); 669 } 670 } 671 } 672 } 673 } 674 675 void 676 in6_pcbpurgeif(head, ifp) 677 struct in6pcb *head; 678 struct ifnet *ifp; 679 { 680 struct in6pcb *in6p, *nin6p; 681 682 for (in6p = head->in6p_next; in6p != head; in6p = nin6p) { 683 nin6p = in6p->in6p_next; 684 if (in6p->in6p_route.ro_rt != NULL && 685 in6p->in6p_route.ro_rt->rt_ifp == ifp) 686 in6_rtchange(in6p, 0); 687 } 688 } 689 690 /* 691 * Check for alternatives when higher level complains 692 * about service problems. For now, invalidate cached 693 * routing information. If the route was created dynamically 694 * (by a redirect), time to try a default gateway again. 695 */ 696 void 697 in6_losing(in6p) 698 struct in6pcb *in6p; 699 { 700 struct rtentry *rt; 701 struct rt_addrinfo info; 702 703 if ((rt = in6p->in6p_route.ro_rt) != NULL) { 704 in6p->in6p_route.ro_rt = 0; 705 bzero((caddr_t)&info, sizeof(info)); 706 info.rti_info[RTAX_DST] = 707 (struct sockaddr *)&in6p->in6p_route.ro_dst; 708 info.rti_info[RTAX_GATEWAY] = rt->rt_gateway; 709 info.rti_info[RTAX_NETMASK] = rt_mask(rt); 710 rt_missmsg(RTM_LOSING, &info, rt->rt_flags, 0); 711 if (rt->rt_flags & RTF_DYNAMIC) { 712 (void)rtrequest(RTM_DELETE, rt_key(rt), 713 rt->rt_gateway, rt_mask(rt), rt->rt_flags, 714 (struct rtentry **)0); 715 } else { 716 /* 717 * A new route can be allocated 718 * the next time output is attempted. 719 */ 720 rtfree(rt); 721 } 722 } 723 } 724 725 /* 726 * After a routing change, flush old routing 727 * and allocate a (hopefully) better one. 728 */ 729 void 730 in6_rtchange(in6p, errno) 731 struct in6pcb *in6p; 732 int errno; 733 { 734 if (in6p->in6p_route.ro_rt) { 735 rtfree(in6p->in6p_route.ro_rt); 736 in6p->in6p_route.ro_rt = 0; 737 /* 738 * A new route can be allocated the next time 739 * output is attempted. 740 */ 741 } 742 } 743 744 struct in6pcb * 745 in6_pcblookup(head, faddr6, fport_arg, laddr6, lport_arg, flags) 746 struct in6pcb *head; 747 struct in6_addr *faddr6, *laddr6; 748 u_int fport_arg, lport_arg; 749 int flags; 750 { 751 struct in6pcb *in6p, *match = 0; 752 int matchwild = 3, wildcard; 753 u_int16_t fport = fport_arg, lport = lport_arg; 754 755 for (in6p = head->in6p_next; in6p != head; in6p = in6p->in6p_next) { 756 if (in6p->in6p_lport != lport) 757 continue; 758 wildcard = 0; 759 if (!IN6_IS_ADDR_UNSPECIFIED(&in6p->in6p_laddr)) { 760 if (IN6_IS_ADDR_UNSPECIFIED(laddr6)) 761 wildcard++; 762 else if (!IN6_ARE_ADDR_EQUAL(&in6p->in6p_laddr, laddr6)) 763 continue; 764 } 765 else if (IN6_IS_ADDR_V4MAPPED(&in6p->in6p_laddr) 766 && in6p->in6p_laddr.s6_addr32[3] == 0) { 767 if (!IN6_IS_ADDR_V4MAPPED(laddr6)) 768 continue; 769 if (laddr6->s6_addr32[3] == 0) 770 ; 771 else 772 wildcard++; 773 } 774 else { 775 if (IN6_IS_ADDR_V4MAPPED(laddr6)) { 776 if (in6p->in6p_flags & IN6P_IPV6_V6ONLY) 777 continue; 778 else 779 wildcard++; 780 } else if (!IN6_IS_ADDR_UNSPECIFIED(laddr6)) 781 wildcard++; 782 } 783 if (!IN6_IS_ADDR_UNSPECIFIED(&in6p->in6p_faddr)) { 784 if (IN6_IS_ADDR_UNSPECIFIED(faddr6)) 785 wildcard++; 786 else if (!IN6_ARE_ADDR_EQUAL(&in6p->in6p_faddr, faddr6) 787 || in6p->in6p_fport != fport) 788 continue; 789 } 790 else if (IN6_IS_ADDR_V4MAPPED(&in6p->in6p_faddr) 791 && in6p->in6p_faddr.s6_addr32[3] == 0) { 792 if (!IN6_IS_ADDR_V4MAPPED(faddr6)) 793 continue; 794 if (faddr6->s6_addr32[3] == 0) 795 ; 796 else 797 wildcard++; 798 } 799 else { 800 if (IN6_IS_ADDR_V4MAPPED(faddr6)) { 801 if (in6p->in6p_flags & IN6P_IPV6_V6ONLY) 802 continue; 803 else 804 wildcard++; 805 } else if (!IN6_IS_ADDR_UNSPECIFIED(faddr6)) 806 wildcard++; 807 } 808 809 if (wildcard && (flags & IN6PLOOKUP_WILDCARD) == 0) 810 continue; 811 if (wildcard < matchwild) { 812 match = in6p; 813 matchwild = wildcard; 814 if (matchwild == 0) 815 break; 816 } 817 } 818 return(match); 819 } 820 821 struct rtentry * 822 in6_pcbrtentry(in6p) 823 struct in6pcb *in6p; 824 { 825 struct route_in6 *ro; 826 struct sockaddr_in6 *dst6; 827 828 ro = &in6p->in6p_route; 829 dst6 = (struct sockaddr_in6 *)&ro->ro_dst; 830 831 if (ro->ro_rt == NULL) { 832 /* 833 * No route yet, so try to acquire one. 834 */ 835 if (!IN6_IS_ADDR_UNSPECIFIED(&in6p->in6p_faddr)) { 836 bzero(dst6, sizeof(*dst6)); 837 dst6->sin6_family = AF_INET6; 838 dst6->sin6_len = sizeof(struct sockaddr_in6); 839 dst6->sin6_addr = in6p->in6p_faddr; 840 rtalloc((struct route *)ro); 841 } 842 } 843 return (ro->ro_rt); 844 } 845 846 struct in6pcb * 847 in6_pcblookup_connect(head, faddr6, fport_arg, laddr6, lport_arg, faith) 848 struct in6pcb *head; 849 struct in6_addr *faddr6, *laddr6; 850 u_int fport_arg, lport_arg; 851 int faith; 852 { 853 struct in6pcb *in6p; 854 u_int16_t fport = fport_arg, lport = lport_arg; 855 856 for (in6p = head->in6p_next; in6p != head; in6p = in6p->in6p_next) { 857 /* find exact match on both source and dest */ 858 if (in6p->in6p_fport != fport) 859 continue; 860 if (in6p->in6p_lport != lport) 861 continue; 862 if (IN6_IS_ADDR_UNSPECIFIED(&in6p->in6p_faddr)) 863 continue; 864 if (!IN6_ARE_ADDR_EQUAL(&in6p->in6p_faddr, faddr6)) 865 continue; 866 if (IN6_IS_ADDR_UNSPECIFIED(&in6p->in6p_laddr)) 867 continue; 868 if (!IN6_ARE_ADDR_EQUAL(&in6p->in6p_laddr, laddr6)) 869 continue; 870 if ((IN6_IS_ADDR_V4MAPPED(laddr6) || 871 IN6_IS_ADDR_V4MAPPED(faddr6)) && 872 (in6p->in6p_flags & IN6P_IPV6_V6ONLY)) 873 continue; 874 return in6p; 875 } 876 return NULL; 877 } 878 879 struct in6pcb * 880 in6_pcblookup_bind(head, laddr6, lport_arg, faith) 881 struct in6pcb *head; 882 struct in6_addr *laddr6; 883 u_int lport_arg; 884 int faith; 885 { 886 struct in6pcb *in6p, *match; 887 u_int16_t lport = lport_arg; 888 889 match = NULL; 890 for (in6p = head->in6p_next; in6p != head; in6p = in6p->in6p_next) { 891 /* 892 * find destination match. exact match is preferred 893 * against wildcard match. 894 */ 895 if (faith && (in6p->in6p_flags & IN6P_FAITH) == 0) 896 continue; 897 if (in6p->in6p_fport != 0) 898 continue; 899 if (in6p->in6p_lport != lport) 900 continue; 901 if (IN6_IS_ADDR_UNSPECIFIED(&in6p->in6p_laddr)) { 902 if (IN6_IS_ADDR_V4MAPPED(laddr6)) { 903 if ((in6p->in6p_flags & IN6P_IPV6_V6ONLY)) 904 continue; 905 else 906 match = in6p; 907 } else 908 match = in6p; 909 } 910 else if (IN6_IS_ADDR_V4MAPPED(&in6p->in6p_laddr) && 911 !(in6p->in6p_flags & IN6P_IPV6_V6ONLY) && 912 in6p->in6p_laddr.s6_addr32[3] == 0) { 913 if (IN6_IS_ADDR_V4MAPPED(laddr6) && 914 laddr6->s6_addr32[3] != 0) 915 match = in6p; 916 } 917 else if (IN6_ARE_ADDR_EQUAL(&in6p->in6p_laddr, laddr6)) 918 return in6p; 919 } 920 return match; 921 } 922
Indexes created Wed Oct 15 16:09:53 GMT 2025