in6_pcb.c revision 1.51
1 /* $NetBSD: in6_pcb.c,v 1.51 2002/08/26 14:25:00 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 <sys/cdefs.h> 69 __KERNEL_RCSID(0, "$NetBSD: in6_pcb.c,v 1.51 2002/08/26 14:25:00 itojun 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 int s; 121 #ifdef IPSEC 122 int error; 123 #endif 124 125 MALLOC(in6p, struct in6pcb *, sizeof(*in6p), M_PCB, M_NOWAIT); 126 if (in6p == NULL) 127 return(ENOBUFS); 128 bzero((caddr_t)in6p, sizeof(*in6p)); 129 in6p->in6p_head = head; 130 in6p->in6p_socket = so; 131 in6p->in6p_hops = -1; /* use kernel default */ 132 in6p->in6p_icmp6filt = NULL; 133 #ifdef IPSEC 134 error = ipsec_init_pcbpolicy(so, &in6p->in6p_sp); 135 if (error != 0) { 136 FREE(in6p, M_PCB); 137 return error; 138 } 139 #endif /* IPSEC */ 140 s = splnet(); 141 in6p->in6p_next = head->in6p_next; 142 head->in6p_next = in6p; 143 in6p->in6p_prev = head; 144 in6p->in6p_next->in6p_prev = in6p; 145 splx(s); 146 if (ip6_v6only) 147 in6p->in6p_flags |= IN6P_IPV6_V6ONLY; 148 so->so_pcb = (caddr_t)in6p; 149 return(0); 150 } 151 152 int 153 in6_pcbbind(in6p, nam, p) 154 struct in6pcb *in6p; 155 struct mbuf *nam; 156 struct proc *p; 157 { 158 struct socket *so = in6p->in6p_socket; 159 struct in6pcb *head = in6p->in6p_head; 160 struct sockaddr_in6 *sin6 = (struct sockaddr_in6 *)NULL; 161 u_int16_t lport = 0; 162 int wild = 0, reuseport = (so->so_options & SO_REUSEPORT); 163 164 if (in6p->in6p_lport || !IN6_IS_ADDR_UNSPECIFIED(&in6p->in6p_laddr)) 165 return(EINVAL); 166 if ((so->so_options & (SO_REUSEADDR|SO_REUSEPORT)) == 0 && 167 ((so->so_proto->pr_flags & PR_CONNREQUIRED) == 0 || 168 (so->so_options & SO_ACCEPTCONN) == 0)) 169 wild = IN6PLOOKUP_WILDCARD; 170 if (nam) { 171 sin6 = mtod(nam, struct sockaddr_in6 *); 172 if (nam->m_len != sizeof(*sin6)) 173 return(EINVAL); 174 /* 175 * We should check the family, but old programs 176 * incorrectly fail to intialize it. 177 */ 178 if (sin6->sin6_family != AF_INET6) 179 return(EAFNOSUPPORT); 180 181 /* 182 * since we do not check port number duplicate with IPv4 space, 183 * we reject it at this moment. If we leave it, we would 184 * mistakenly allow normal users to hijack tcp/udp ports from 185 * other users. 186 */ 187 if (IN6_IS_ADDR_V4MAPPED(&sin6->sin6_addr)) 188 return(EADDRNOTAVAIL); 189 190 /* KAME hack: embed scopeid */ 191 if (in6_embedscope(&sin6->sin6_addr, sin6, in6p, NULL) != 0) 192 return EINVAL; 193 /* this must be cleared for ifa_ifwithaddr() */ 194 sin6->sin6_scope_id = 0; 195 196 lport = sin6->sin6_port; 197 if (IN6_IS_ADDR_MULTICAST(&sin6->sin6_addr)) { 198 /* 199 * Treat SO_REUSEADDR as SO_REUSEPORT for multicast; 200 * allow compepte duplication of binding if 201 * SO_REUSEPORT is set, or if SO_REUSEADDR is set 202 * and a multicast address is bound on both 203 * new and duplicated sockets. 204 */ 205 if (so->so_options & SO_REUSEADDR) 206 reuseport = SO_REUSEADDR|SO_REUSEPORT; 207 } 208 else if (IN6_IS_ADDR_V4MAPPED(&sin6->sin6_addr)) { 209 struct sockaddr_in sin; 210 211 bzero(&sin, sizeof(sin)); 212 sin.sin_len = sizeof(sin); 213 sin.sin_family = AF_INET; 214 bcopy(&sin6->sin6_addr.s6_addr32[3], &sin.sin_addr, 215 sizeof(sin.sin_addr)); 216 if (ifa_ifwithaddr((struct sockaddr *)&sin) == 0) 217 return EADDRNOTAVAIL; 218 } 219 else if (!IN6_IS_ADDR_UNSPECIFIED(&sin6->sin6_addr)) { 220 struct ifaddr *ia = NULL; 221 222 sin6->sin6_port = 0; /* yech... */ 223 if ((in6p->in6p_flags & IN6P_FAITH) == 0 && 224 (ia = ifa_ifwithaddr((struct sockaddr *)sin6)) == 0) 225 return(EADDRNOTAVAIL); 226 227 /* 228 * bind to an anycast address might accidentally 229 * cause sending a packet with an anycast source 230 * address, so we forbid it. 231 * 232 * We should allow to bind to a deprecated address, 233 * since the application dare to use it. 234 * But, can we assume that they are careful enough 235 * to check if the address is deprecated or not? 236 * Maybe, as a safeguard, we should have a setsockopt 237 * flag to control the bind(2) behavior against 238 * deprecated addresses (default: forbid bind(2)). 239 */ 240 if (ia && 241 ((struct in6_ifaddr *)ia)->ia6_flags & 242 (IN6_IFF_ANYCAST|IN6_IFF_NOTREADY|IN6_IFF_DETACHED)) 243 return(EADDRNOTAVAIL); 244 } 245 if (lport) { 246 #ifndef IPNOPRIVPORTS 247 int priv; 248 249 /* 250 * NOTE: all operating systems use suser() for 251 * privilege check! do not rewrite it into SS_PRIV. 252 */ 253 priv = (p && !suser(p->p_ucred, &p->p_acflag)) ? 1 : 0; 254 /* GROSS */ 255 if (ntohs(lport) < IPV6PORT_RESERVED && !priv) 256 return(EACCES); 257 #endif 258 259 if (IN6_IS_ADDR_V4MAPPED(&sin6->sin6_addr)) { 260 /* should check this but we can't ... */ 261 #if 0 262 struct inpcb *t; 263 264 t = in_pcblookup_bind(&tcbtable, 265 (struct in_addr *)&sin6->sin6_addr.s6_addr32[3], 266 lport); 267 if (t && (reuseport & t->inp_socket->so_options) == 0) 268 return EADDRINUSE; 269 #endif 270 } else 271 { 272 struct in6pcb *t; 273 274 t = in6_pcblookup(head, &zeroin6_addr, 0, 275 &sin6->sin6_addr, lport, wild); 276 if (t && (reuseport & t->in6p_socket->so_options) == 0) 277 return(EADDRINUSE); 278 } 279 } 280 in6p->in6p_laddr = sin6->sin6_addr; 281 } 282 283 if (lport == 0) { 284 int e; 285 if ((e = in6_pcbsetport(&in6p->in6p_laddr, in6p, p)) != 0) 286 return(e); 287 } 288 else 289 in6p->in6p_lport = lport; 290 291 in6p->in6p_flowinfo = sin6 ? sin6->sin6_flowinfo : 0; /*XXX*/ 292 return(0); 293 } 294 295 /* 296 * Connect from a socket to a specified address. 297 * Both address and port must be specified in argument sin6. 298 * If don't have a local address for this socket yet, 299 * then pick one. 300 */ 301 int 302 in6_pcbconnect(in6p, nam) 303 struct in6pcb *in6p; 304 struct mbuf *nam; 305 { 306 struct in6_addr *in6a = NULL; 307 struct sockaddr_in6 *sin6 = mtod(nam, struct sockaddr_in6 *); 308 struct ifnet *ifp = NULL; /* outgoing interface */ 309 int error = 0; 310 #ifdef INET 311 struct in6_addr mapped; 312 #endif 313 struct sockaddr_in6 tmp; 314 315 (void)&in6a; /* XXX fool gcc */ 316 317 if (nam->m_len != sizeof(*sin6)) 318 return(EINVAL); 319 if (sin6->sin6_family != AF_INET6) 320 return(EAFNOSUPPORT); 321 if (sin6->sin6_port == 0) 322 return(EADDRNOTAVAIL); 323 324 /* sanity check for mapped address case */ 325 if (IN6_IS_ADDR_V4MAPPED(&sin6->sin6_addr)) { 326 if ((in6p->in6p_flags & IN6P_IPV6_V6ONLY) != 0) 327 return EINVAL; 328 if (IN6_IS_ADDR_UNSPECIFIED(&in6p->in6p_laddr)) 329 in6p->in6p_laddr.s6_addr16[5] = htons(0xffff); 330 if (!IN6_IS_ADDR_V4MAPPED(&in6p->in6p_laddr)) 331 return EINVAL; 332 } else 333 { 334 if (IN6_IS_ADDR_V4MAPPED(&in6p->in6p_laddr)) 335 return EINVAL; 336 } 337 338 /* protect *sin6 from overwrites */ 339 tmp = *sin6; 340 sin6 = &tmp; 341 342 /* KAME hack: embed scopeid */ 343 if (in6_embedscope(&sin6->sin6_addr, sin6, in6p, &ifp) != 0) 344 return EINVAL; 345 346 /* Source address selection. */ 347 if (IN6_IS_ADDR_V4MAPPED(&in6p->in6p_laddr) 348 && in6p->in6p_laddr.s6_addr32[3] == 0) { 349 #ifdef INET 350 struct sockaddr_in sin, *sinp; 351 352 bzero(&sin, sizeof(sin)); 353 sin.sin_len = sizeof(sin); 354 sin.sin_family = AF_INET; 355 bcopy(&sin6->sin6_addr.s6_addr32[3], &sin.sin_addr, 356 sizeof(sin.sin_addr)); 357 sinp = in_selectsrc(&sin, (struct route *)&in6p->in6p_route, 358 in6p->in6p_socket->so_options, NULL, &error); 359 if (sinp == 0) { 360 if (error == 0) 361 error = EADDRNOTAVAIL; 362 return(error); 363 } 364 bzero(&mapped, sizeof(mapped)); 365 mapped.s6_addr16[5] = htons(0xffff); 366 bcopy(&sinp->sin_addr, &mapped.s6_addr32[3], sizeof(sinp->sin_addr)); 367 in6a = &mapped; 368 #else 369 return EADDRNOTAVAIL; 370 #endif 371 } else 372 { 373 /* 374 * XXX: in6_selectsrc might replace the bound local address 375 * with the address specified by setsockopt(IPV6_PKTINFO). 376 * Is it the intended behavior? 377 */ 378 in6a = in6_selectsrc(sin6, in6p->in6p_outputopts, 379 in6p->in6p_moptions, 380 &in6p->in6p_route, 381 &in6p->in6p_laddr, &error); 382 if (in6a == 0) { 383 if (error == 0) 384 error = EADDRNOTAVAIL; 385 return(error); 386 } 387 } 388 if (in6p->in6p_route.ro_rt) 389 ifp = in6p->in6p_route.ro_rt->rt_ifp; 390 391 in6p->in6p_ip6.ip6_hlim = (u_int8_t)in6_selecthlim(in6p, ifp); 392 393 if (in6_pcblookup(in6p->in6p_head, 394 &sin6->sin6_addr, 395 sin6->sin6_port, 396 IN6_IS_ADDR_UNSPECIFIED(&in6p->in6p_laddr) ? 397 in6a : &in6p->in6p_laddr, 398 in6p->in6p_lport, 399 0)) 400 return(EADDRINUSE); 401 if (IN6_IS_ADDR_UNSPECIFIED(&in6p->in6p_laddr) 402 || (IN6_IS_ADDR_V4MAPPED(&in6p->in6p_laddr) 403 && in6p->in6p_laddr.s6_addr32[3] == 0)) 404 { 405 /* 406 * XXX in IPv4 mapped address case, we should grab fresh 407 * local port number by in_pcbbind, not in6_pcbbind. 408 * if we are in bad luck, we may assign conflicting port number 409 * between IPv4 and IPv6 unwillingly. 410 */ 411 if (in6p->in6p_lport == 0) { 412 (void)in6_pcbbind(in6p, (struct mbuf *)0, 413 (struct proc *)0); 414 } 415 in6p->in6p_laddr = *in6a; 416 } 417 in6p->in6p_faddr = sin6->sin6_addr; 418 in6p->in6p_fport = sin6->sin6_port; 419 /* 420 * xxx kazu flowlabel is necessary for connect? 421 * but if this line is missing, the garbage value remains. 422 */ 423 in6p->in6p_flowinfo = sin6->sin6_flowinfo; 424 #ifdef IPSEC 425 if (in6p->in6p_socket->so_type == SOCK_STREAM) 426 ipsec_pcbconn(in6p->in6p_sp); 427 #endif 428 return(0); 429 } 430 431 void 432 in6_pcbdisconnect(in6p) 433 struct in6pcb *in6p; 434 { 435 bzero((caddr_t)&in6p->in6p_faddr, sizeof(in6p->in6p_faddr)); 436 in6p->in6p_fport = 0; 437 if (in6p->in6p_socket->so_state & SS_NOFDREF) 438 in6_pcbdetach(in6p); 439 #ifdef IPSEC 440 ipsec_pcbdisconn(in6p->in6p_sp); 441 #endif 442 } 443 444 void 445 in6_pcbdetach(in6p) 446 struct in6pcb *in6p; 447 { 448 struct socket *so = in6p->in6p_socket; 449 int s; 450 451 #ifdef IPSEC 452 ipsec6_delete_pcbpolicy(in6p); 453 #endif /* IPSEC */ 454 sotoin6pcb(so) = 0; 455 sofree(so); 456 if (in6p->in6p_options) 457 m_freem(in6p->in6p_options); 458 if (in6p->in6p_outputopts) { 459 if (in6p->in6p_outputopts->ip6po_rthdr && 460 in6p->in6p_outputopts->ip6po_route.ro_rt) 461 RTFREE(in6p->in6p_outputopts->ip6po_route.ro_rt); 462 if (in6p->in6p_outputopts->ip6po_m) 463 (void)m_free(in6p->in6p_outputopts->ip6po_m); 464 free(in6p->in6p_outputopts, M_IP6OPT); 465 } 466 if (in6p->in6p_route.ro_rt) 467 rtfree(in6p->in6p_route.ro_rt); 468 ip6_freemoptions(in6p->in6p_moptions); 469 s = splnet(); 470 in6p->in6p_next->in6p_prev = in6p->in6p_prev; 471 in6p->in6p_prev->in6p_next = in6p->in6p_next; 472 in6p->in6p_prev = NULL; 473 splx(s); 474 FREE(in6p, M_PCB); 475 } 476 477 void 478 in6_setsockaddr(in6p, nam) 479 struct in6pcb *in6p; 480 struct mbuf *nam; 481 { 482 struct sockaddr_in6 *sin6; 483 484 nam->m_len = sizeof(*sin6); 485 sin6 = mtod(nam, struct sockaddr_in6 *); 486 bzero((caddr_t)sin6, sizeof(*sin6)); 487 sin6->sin6_family = AF_INET6; 488 sin6->sin6_len = sizeof(struct sockaddr_in6); 489 sin6->sin6_port = in6p->in6p_lport; 490 /* KAME hack: recover scopeid */ 491 (void)in6_recoverscope(sin6, &in6p->in6p_laddr, NULL); 492 } 493 494 void 495 in6_setpeeraddr(in6p, nam) 496 struct in6pcb *in6p; 497 struct mbuf *nam; 498 { 499 struct sockaddr_in6 *sin6; 500 501 nam->m_len = sizeof(*sin6); 502 sin6 = mtod(nam, struct sockaddr_in6 *); 503 bzero((caddr_t)sin6, sizeof(*sin6)); 504 sin6->sin6_family = AF_INET6; 505 sin6->sin6_len = sizeof(struct sockaddr_in6); 506 sin6->sin6_port = in6p->in6p_fport; 507 /* KAME hack: recover scopeid */ 508 (void)in6_recoverscope(sin6, &in6p->in6p_faddr, NULL); 509 } 510 511 /* 512 * Pass some notification to all connections of a protocol 513 * associated with address dst. The local address and/or port numbers 514 * may be specified to limit the search. The "usual action" will be 515 * taken, depending on the ctlinput cmd. The caller must filter any 516 * cmds that are uninteresting (e.g., no error in the map). 517 * Call the protocol specific routine (if any) to report 518 * any errors for each matching socket. 519 * 520 * Must be called at splsoftnet. 521 * 522 * Note: src (4th arg) carries the flowlabel value on the original IPv6 523 * header, in sin6_flowinfo member. 524 */ 525 int 526 in6_pcbnotify(head, dst, fport_arg, src, lport_arg, cmd, cmdarg, notify) 527 struct in6pcb *head; 528 struct sockaddr *dst, *src; 529 u_int fport_arg, lport_arg; 530 int cmd; 531 void *cmdarg; 532 void (*notify) __P((struct in6pcb *, int)); 533 { 534 struct in6pcb *in6p, *nin6p; 535 struct sockaddr_in6 sa6_src, *sa6_dst; 536 u_int16_t fport = fport_arg, lport = lport_arg; 537 int errno; 538 int nmatch = 0; 539 u_int32_t flowinfo; 540 541 if ((unsigned)cmd > PRC_NCMDS || dst->sa_family != AF_INET6) 542 return 0; 543 544 sa6_dst = (struct sockaddr_in6 *)dst; 545 if (IN6_IS_ADDR_UNSPECIFIED(&sa6_dst->sin6_addr)) 546 return 0; 547 548 /* 549 * note that src can be NULL when we get notify by local fragmentation. 550 */ 551 sa6_src = (src == NULL) ? sa6_any : *(struct sockaddr_in6 *)src; 552 flowinfo = sa6_src.sin6_flowinfo; 553 554 /* 555 * Redirects go to all references to the destination, 556 * and use in6_rtchange to invalidate the route cache. 557 * Dead host indications: also use in6_rtchange to invalidate 558 * the cache, and deliver the error to all the sockets. 559 * Otherwise, if we have knowledge of the local port and address, 560 * deliver only to that socket. 561 */ 562 if (PRC_IS_REDIRECT(cmd) || cmd == PRC_HOSTDEAD) { 563 fport = 0; 564 lport = 0; 565 bzero((caddr_t)&sa6_src.sin6_addr, sizeof(sa6_src.sin6_addr)); 566 567 if (cmd != PRC_HOSTDEAD) 568 notify = in6_rtchange; 569 } 570 571 errno = inet6ctlerrmap[cmd]; 572 for (in6p = head->in6p_next; in6p != head; in6p = nin6p) { 573 nin6p = in6p->in6p_next; 574 575 /* 576 * Under the following condition, notify of redirects 577 * to the pcb, without making address matches against inpcb. 578 * - redirect notification is arrived. 579 * - the inpcb is unconnected. 580 * - the inpcb is caching !RTF_HOST routing entry. 581 * - the ICMPv6 notification is from the gateway cached in the 582 * inpcb. i.e. ICMPv6 notification is from nexthop gateway 583 * the inpcb used very recently. 584 * 585 * This is to improve interaction between netbsd/openbsd 586 * redirect handling code, and inpcb route cache code. 587 * without the clause, !RTF_HOST routing entry (which carries 588 * gateway used by inpcb right before the ICMPv6 redirect) 589 * will be cached forever in unconnected inpcb. 590 * 591 * There still is a question regarding to what is TRT: 592 * - On bsdi/freebsd, RTF_HOST (cloned) routing entry will be 593 * generated on packet output. inpcb will always cache 594 * RTF_HOST routing entry so there's no need for the clause 595 * (ICMPv6 redirect will update RTF_HOST routing entry, 596 * and inpcb is caching it already). 597 * However, bsdi/freebsd are vulnerable to local DoS attacks 598 * due to the cloned routing entries. 599 * - Specwise, "destination cache" is mentioned in RFC2461. 600 * Jinmei says that it implies bsdi/freebsd behavior, itojun 601 * is not really convinced. 602 * - Having hiwat/lowat on # of cloned host route (redirect/ 603 * pmtud) may be a good idea. netbsd/openbsd has it. see 604 * icmp6_mtudisc_update(). 605 */ 606 if ((PRC_IS_REDIRECT(cmd) || cmd == PRC_HOSTDEAD) && 607 IN6_IS_ADDR_UNSPECIFIED(&in6p->in6p_laddr) && 608 in6p->in6p_route.ro_rt && 609 !(in6p->in6p_route.ro_rt->rt_flags & RTF_HOST)) { 610 struct sockaddr_in6 *dst6; 611 612 dst6 = (struct sockaddr_in6 *)&in6p->in6p_route.ro_dst; 613 if (IN6_ARE_ADDR_EQUAL(&dst6->sin6_addr, 614 &sa6_dst->sin6_addr)) 615 goto do_notify; 616 } 617 618 /* 619 * Detect if we should notify the error. If no source and 620 * destination ports are specified, but non-zero flowinfo and 621 * local address match, notify the error. This is the case 622 * when the error is delivered with an encrypted buffer 623 * by ESP. Otherwise, just compare addresses and ports 624 * as usual. 625 */ 626 if (lport == 0 && fport == 0 && flowinfo && 627 in6p->in6p_socket != NULL && 628 flowinfo == (in6p->in6p_flowinfo & IPV6_FLOWLABEL_MASK) && 629 IN6_ARE_ADDR_EQUAL(&in6p->in6p_laddr, &sa6_src.sin6_addr)) 630 goto do_notify; 631 else if (!IN6_ARE_ADDR_EQUAL(&in6p->in6p_faddr, 632 &sa6_dst->sin6_addr) || 633 in6p->in6p_socket == 0 || 634 (lport && in6p->in6p_lport != lport) || 635 (!IN6_IS_ADDR_UNSPECIFIED(&sa6_src.sin6_addr) && 636 !IN6_ARE_ADDR_EQUAL(&in6p->in6p_laddr, 637 &sa6_src.sin6_addr)) || 638 (fport && in6p->in6p_fport != fport)) 639 continue; 640 641 do_notify: 642 if (notify) 643 (*notify)(in6p, errno); 644 nmatch++; 645 } 646 return nmatch; 647 } 648 649 void 650 in6_pcbpurgeif0(head, ifp) 651 struct in6pcb *head; 652 struct ifnet *ifp; 653 { 654 struct in6pcb *in6p, *nin6p; 655 struct ip6_moptions *im6o; 656 struct in6_multi_mship *imm, *nimm; 657 658 for (in6p = head->in6p_next; in6p != head; in6p = nin6p) { 659 nin6p = in6p->in6p_next; 660 im6o = in6p->in6p_moptions; 661 if (im6o) { 662 /* 663 * Unselect the outgoing interface if it is being 664 * detached. 665 */ 666 if (im6o->im6o_multicast_ifp == ifp) 667 im6o->im6o_multicast_ifp = NULL; 668 669 /* 670 * Drop multicast group membership if we joined 671 * through the interface being detached. 672 * XXX controversial - is it really legal for kernel 673 * to force this? 674 */ 675 for (imm = im6o->im6o_memberships.lh_first; 676 imm != NULL; imm = nimm) { 677 nimm = imm->i6mm_chain.le_next; 678 if (imm->i6mm_maddr->in6m_ifp == ifp) { 679 LIST_REMOVE(imm, i6mm_chain); 680 in6_leavegroup(imm); 681 } 682 } 683 } 684 } 685 } 686 687 void 688 in6_pcbpurgeif(head, ifp) 689 struct in6pcb *head; 690 struct ifnet *ifp; 691 { 692 struct in6pcb *in6p, *nin6p; 693 694 for (in6p = head->in6p_next; in6p != head; in6p = nin6p) { 695 nin6p = in6p->in6p_next; 696 if (in6p->in6p_route.ro_rt != NULL && 697 in6p->in6p_route.ro_rt->rt_ifp == ifp) 698 in6_rtchange(in6p, 0); 699 } 700 } 701 702 /* 703 * Check for alternatives when higher level complains 704 * about service problems. For now, invalidate cached 705 * routing information. If the route was created dynamically 706 * (by a redirect), time to try a default gateway again. 707 */ 708 void 709 in6_losing(in6p) 710 struct in6pcb *in6p; 711 { 712 struct rtentry *rt; 713 struct rt_addrinfo info; 714 715 if ((rt = in6p->in6p_route.ro_rt) != NULL) { 716 in6p->in6p_route.ro_rt = 0; 717 bzero((caddr_t)&info, sizeof(info)); 718 info.rti_info[RTAX_DST] = 719 (struct sockaddr *)&in6p->in6p_route.ro_dst; 720 info.rti_info[RTAX_GATEWAY] = rt->rt_gateway; 721 info.rti_info[RTAX_NETMASK] = rt_mask(rt); 722 rt_missmsg(RTM_LOSING, &info, rt->rt_flags, 0); 723 if (rt->rt_flags & RTF_DYNAMIC) { 724 (void)rtrequest(RTM_DELETE, rt_key(rt), 725 rt->rt_gateway, rt_mask(rt), rt->rt_flags, 726 (struct rtentry **)0); 727 } else { 728 /* 729 * A new route can be allocated 730 * the next time output is attempted. 731 */ 732 rtfree(rt); 733 } 734 } 735 } 736 737 /* 738 * After a routing change, flush old routing 739 * and allocate a (hopefully) better one. 740 */ 741 void 742 in6_rtchange(in6p, errno) 743 struct in6pcb *in6p; 744 int errno; 745 { 746 if (in6p->in6p_route.ro_rt) { 747 rtfree(in6p->in6p_route.ro_rt); 748 in6p->in6p_route.ro_rt = 0; 749 /* 750 * A new route can be allocated the next time 751 * output is attempted. 752 */ 753 } 754 } 755 756 struct in6pcb * 757 in6_pcblookup(head, faddr6, fport_arg, laddr6, lport_arg, flags) 758 struct in6pcb *head; 759 struct in6_addr *faddr6, *laddr6; 760 u_int fport_arg, lport_arg; 761 int flags; 762 { 763 struct in6pcb *in6p, *match = 0; 764 int matchwild = 3, wildcard; 765 u_int16_t fport = fport_arg, lport = lport_arg; 766 767 for (in6p = head->in6p_next; in6p != head; in6p = in6p->in6p_next) { 768 if (in6p->in6p_lport != lport) 769 continue; 770 wildcard = 0; 771 if (!IN6_IS_ADDR_UNSPECIFIED(&in6p->in6p_laddr)) { 772 if (IN6_IS_ADDR_UNSPECIFIED(laddr6)) 773 wildcard++; 774 else if (!IN6_ARE_ADDR_EQUAL(&in6p->in6p_laddr, laddr6)) 775 continue; 776 } 777 else if (IN6_IS_ADDR_V4MAPPED(&in6p->in6p_laddr) 778 && in6p->in6p_laddr.s6_addr32[3] == 0) { 779 if (!IN6_IS_ADDR_V4MAPPED(laddr6)) 780 continue; 781 if (laddr6->s6_addr32[3] == 0) 782 ; 783 else 784 wildcard++; 785 } 786 else { 787 if (IN6_IS_ADDR_V4MAPPED(laddr6)) { 788 if (in6p->in6p_flags & IN6P_IPV6_V6ONLY) 789 continue; 790 else 791 wildcard++; 792 } else if (!IN6_IS_ADDR_UNSPECIFIED(laddr6)) 793 wildcard++; 794 } 795 if (!IN6_IS_ADDR_UNSPECIFIED(&in6p->in6p_faddr)) { 796 if (IN6_IS_ADDR_UNSPECIFIED(faddr6)) 797 wildcard++; 798 else if (!IN6_ARE_ADDR_EQUAL(&in6p->in6p_faddr, faddr6) 799 || in6p->in6p_fport != fport) 800 continue; 801 } 802 else if (IN6_IS_ADDR_V4MAPPED(&in6p->in6p_faddr) 803 && in6p->in6p_faddr.s6_addr32[3] == 0) { 804 if (!IN6_IS_ADDR_V4MAPPED(faddr6)) 805 continue; 806 if (faddr6->s6_addr32[3] == 0) 807 ; 808 else 809 wildcard++; 810 } 811 else { 812 if (IN6_IS_ADDR_V4MAPPED(faddr6)) { 813 if (in6p->in6p_flags & IN6P_IPV6_V6ONLY) 814 continue; 815 else 816 wildcard++; 817 } else if (!IN6_IS_ADDR_UNSPECIFIED(faddr6)) 818 wildcard++; 819 } 820 821 if (wildcard && (flags & IN6PLOOKUP_WILDCARD) == 0) 822 continue; 823 if (wildcard < matchwild) { 824 match = in6p; 825 matchwild = wildcard; 826 if (matchwild == 0) 827 break; 828 } 829 } 830 return(match); 831 } 832 833 struct rtentry * 834 in6_pcbrtentry(in6p) 835 struct in6pcb *in6p; 836 { 837 struct route_in6 *ro; 838 struct sockaddr_in6 *dst6; 839 840 ro = &in6p->in6p_route; 841 dst6 = (struct sockaddr_in6 *)&ro->ro_dst; 842 843 if (ro->ro_rt && ((ro->ro_rt->rt_flags & RTF_UP) == 0 || 844 !IN6_ARE_ADDR_EQUAL(&dst6->sin6_addr, &in6p->in6p_faddr))) { 845 RTFREE(ro->ro_rt); 846 ro->ro_rt = (struct rtentry *)NULL; 847 } 848 if (ro->ro_rt == (struct rtentry *)NULL && 849 !IN6_IS_ADDR_UNSPECIFIED(&in6p->in6p_faddr)) { 850 bzero(dst6, sizeof(*dst6)); 851 dst6->sin6_family = AF_INET6; 852 dst6->sin6_len = sizeof(struct sockaddr_in6); 853 dst6->sin6_addr = in6p->in6p_faddr; 854 rtalloc((struct route *)ro); 855 } 856 return (ro->ro_rt); 857 } 858 859 struct in6pcb * 860 in6_pcblookup_connect(head, faddr6, fport_arg, laddr6, lport_arg, faith) 861 struct in6pcb *head; 862 struct in6_addr *faddr6, *laddr6; 863 u_int fport_arg, lport_arg; 864 int faith; 865 { 866 struct in6pcb *in6p; 867 u_int16_t fport = fport_arg, lport = lport_arg; 868 869 for (in6p = head->in6p_next; in6p != head; in6p = in6p->in6p_next) { 870 /* find exact match on both source and dest */ 871 if (in6p->in6p_fport != fport) 872 continue; 873 if (in6p->in6p_lport != lport) 874 continue; 875 if (IN6_IS_ADDR_UNSPECIFIED(&in6p->in6p_faddr)) 876 continue; 877 if (!IN6_ARE_ADDR_EQUAL(&in6p->in6p_faddr, faddr6)) 878 continue; 879 if (IN6_IS_ADDR_UNSPECIFIED(&in6p->in6p_laddr)) 880 continue; 881 if (!IN6_ARE_ADDR_EQUAL(&in6p->in6p_laddr, laddr6)) 882 continue; 883 if ((IN6_IS_ADDR_V4MAPPED(laddr6) || 884 IN6_IS_ADDR_V4MAPPED(faddr6)) && 885 (in6p->in6p_flags & IN6P_IPV6_V6ONLY)) 886 continue; 887 return in6p; 888 } 889 return NULL; 890 } 891 892 struct in6pcb * 893 in6_pcblookup_bind(head, laddr6, lport_arg, faith) 894 struct in6pcb *head; 895 struct in6_addr *laddr6; 896 u_int lport_arg; 897 int faith; 898 { 899 struct in6pcb *in6p, *match; 900 u_int16_t lport = lport_arg; 901 902 match = NULL; 903 for (in6p = head->in6p_next; in6p != head; in6p = in6p->in6p_next) { 904 /* 905 * find destination match. exact match is preferred 906 * against wildcard match. 907 */ 908 if (faith && (in6p->in6p_flags & IN6P_FAITH) == 0) 909 continue; 910 if (in6p->in6p_fport != 0) 911 continue; 912 if (in6p->in6p_lport != lport) 913 continue; 914 if (IN6_IS_ADDR_UNSPECIFIED(&in6p->in6p_laddr)) { 915 if (IN6_IS_ADDR_V4MAPPED(laddr6)) { 916 if ((in6p->in6p_flags & IN6P_IPV6_V6ONLY)) 917 continue; 918 else 919 match = in6p; 920 } else 921 match = in6p; 922 } 923 else if (IN6_IS_ADDR_V4MAPPED(&in6p->in6p_laddr) && 924 !(in6p->in6p_flags & IN6P_IPV6_V6ONLY) && 925 in6p->in6p_laddr.s6_addr32[3] == 0) { 926 if (IN6_IS_ADDR_V4MAPPED(laddr6) && 927 laddr6->s6_addr32[3] != 0) 928 match = in6p; 929 } 930 else if (IN6_ARE_ADDR_EQUAL(&in6p->in6p_laddr, laddr6)) 931 return in6p; 932 } 933 return match; 934 } 935
Indexes created Tue Sep 23 07:09:52 GMT 2025