in6_pcb.c revision 1.69.2.2
1 /* $NetBSD: in6_pcb.c,v 1.69.2.2 2006/09/09 02:58:55 rpaulo 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. Neither the name of the University nor the names of its contributors 46 * may be used to endorse or promote products derived from this software 47 * without specific prior written permission. 48 * 49 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND 50 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 51 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 52 * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE 53 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 54 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 55 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 56 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 57 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 58 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 59 * SUCH DAMAGE. 60 * 61 * @(#)in_pcb.c 8.2 (Berkeley) 1/4/94 62 */ 63 64 #include <sys/cdefs.h> 65 __KERNEL_RCSID(0, "$NetBSD: in6_pcb.c,v 1.69.2.2 2006/09/09 02:58:55 rpaulo Exp $"); 66 67 #include "opt_inet.h" 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 #include <sys/kauth.h> 82 83 #include <net/if.h> 84 #include <net/route.h> 85 86 #include <netinet/in.h> 87 #include <netinet/in_var.h> 88 #include <netinet/in_systm.h> 89 #include <netinet/ip.h> 90 #include <netinet/in_pcb.h> 91 #include <netinet/ip6.h> 92 #include <netinet6/ip6_var.h> 93 #include <netinet6/scope6_var.h> 94 #include <netinet6/nd6.h> 95 96 #include "faith.h" 97 98 #ifdef IPSEC 99 #include <netinet6/ipsec.h> 100 #include <netkey/key.h> 101 #endif /* IPSEC */ 102 103 #ifdef FAST_IPSEC 104 #include <netipsec/ipsec.h> 105 #include <netipsec/ipsec6.h> 106 #include <netipsec/key.h> 107 #endif /* FAST_IPSEC */ 108 109 struct in6_addr zeroin6_addr; 110 111 #define IN6PCBHASH_PORT(table, lport) \ 112 &(table)->inpt_porthashtbl[ntohs(lport) & (table)->inpt_porthash] 113 #define IN6PCBHASH_BIND(table, laddr, lport) \ 114 &(table)->inpt_bindhashtbl[ \ 115 (((laddr)->s6_addr32[0] ^ (laddr)->s6_addr32[1] ^ \ 116 (laddr)->s6_addr32[2] ^ (laddr)->s6_addr32[3]) + ntohs(lport)) & \ 117 (table)->inpt_bindhash] 118 #define IN6PCBHASH_CONNECT(table, faddr, fport, laddr, lport) \ 119 &(table)->inpt_bindhashtbl[ \ 120 ((((faddr)->s6_addr32[0] ^ (faddr)->s6_addr32[1] ^ \ 121 (faddr)->s6_addr32[2] ^ (faddr)->s6_addr32[3]) + ntohs(fport)) + \ 122 (((laddr)->s6_addr32[0] ^ (laddr)->s6_addr32[1] ^ \ 123 (laddr)->s6_addr32[2] ^ (laddr)->s6_addr32[3]) + \ 124 ntohs(lport))) & (table)->inpt_bindhash] 125 126 int ip6_anonportmin = IPV6PORT_ANONMIN; 127 int ip6_anonportmax = IPV6PORT_ANONMAX; 128 int ip6_lowportmin = IPV6PORT_RESERVEDMIN; 129 int ip6_lowportmax = IPV6PORT_RESERVEDMAX; 130 131 POOL_INIT(in6pcb_pool, sizeof(struct in6pcb), 0, 0, 0, "in6pcbpl", NULL); 132 133 void 134 in6_pcbinit(table, bindhashsize, connecthashsize) 135 struct inpcbtable *table; 136 int bindhashsize, connecthashsize; 137 { 138 139 in_pcbinit(table, bindhashsize, connecthashsize); 140 table->inpt_lastport = (u_int16_t)ip6_anonportmax; 141 } 142 143 int 144 in6_pcballoc(so, v) 145 struct socket *so; 146 void *v; 147 { 148 struct inpcbtable *table = v; 149 struct in6pcb *in6p; 150 int s; 151 #if defined(IPSEC) || defined(FAST_IPSEC) 152 int error; 153 #endif 154 155 in6p = pool_get(&in6pcb_pool, PR_NOWAIT); 156 if (in6p == NULL) 157 return (ENOBUFS); 158 bzero((caddr_t)in6p, sizeof(*in6p)); 159 in6p->in6p_af = AF_INET6; 160 in6p->in6p_table = table; 161 in6p->in6p_socket = so; 162 in6p->in6p_hops = -1; /* use kernel default */ 163 in6p->in6p_icmp6filt = NULL; 164 #if defined(IPSEC) || defined(FAST_IPSEC) 165 error = ipsec_init_pcbpolicy(so, &in6p->in6p_sp); 166 if (error != 0) { 167 pool_put(&in6pcb_pool, in6p); 168 return error; 169 } 170 #endif /* IPSEC */ 171 s = splnet(); 172 CIRCLEQ_INSERT_HEAD(&table->inpt_queue, (struct inpcb_hdr*)in6p, 173 inph_queue); 174 LIST_INSERT_HEAD(IN6PCBHASH_PORT(table, in6p->in6p_lport), 175 &in6p->in6p_head, inph_lhash); 176 in6_pcbstate(in6p, IN6P_ATTACHED); 177 splx(s); 178 if (ip6_v6only) 179 in6p->in6p_flags |= IN6P_IPV6_V6ONLY; 180 so->so_pcb = (caddr_t)in6p; 181 return (0); 182 } 183 184 int 185 in6_pcbbind(v, nam, l) 186 void *v; 187 struct mbuf *nam; 188 struct lwp *l; 189 { 190 struct in6pcb *in6p = v; 191 struct socket *so = in6p->in6p_socket; 192 struct inpcbtable *table = in6p->in6p_table; 193 struct sockaddr_in6 *sin6 = (struct sockaddr_in6 *)NULL; 194 u_int16_t lport = 0; 195 int wild = 0, reuseport = (so->so_options & SO_REUSEPORT); 196 197 if (in6p->in6p_af != AF_INET6) 198 return (EINVAL); 199 200 if (in6p->in6p_lport || !IN6_IS_ADDR_UNSPECIFIED(&in6p->in6p_laddr)) 201 return (EINVAL); 202 if ((so->so_options & (SO_REUSEADDR|SO_REUSEPORT)) == 0 && 203 ((so->so_proto->pr_flags & PR_CONNREQUIRED) == 0 || 204 (so->so_options & SO_ACCEPTCONN) == 0)) 205 wild = 1; 206 if (nam) { 207 int error; 208 209 sin6 = mtod(nam, struct sockaddr_in6 *); 210 if (nam->m_len != sizeof(*sin6)) 211 return (EINVAL); 212 /* 213 * We should check the family, but old programs 214 * incorrectly fail to intialize it. 215 */ 216 if (sin6->sin6_family != AF_INET6) 217 return (EAFNOSUPPORT); 218 219 #ifndef INET 220 if (IN6_IS_ADDR_V4MAPPED(&sin6->sin6_addr)) 221 return (EADDRNOTAVAIL); 222 #endif 223 224 if ((error = sa6_embedscope(sin6, ip6_use_defzone)) != 0) 225 return (error); 226 227 lport = sin6->sin6_port; 228 if (IN6_IS_ADDR_MULTICAST(&sin6->sin6_addr)) { 229 /* 230 * Treat SO_REUSEADDR as SO_REUSEPORT for multicast; 231 * allow compepte duplication of binding if 232 * SO_REUSEPORT is set, or if SO_REUSEADDR is set 233 * and a multicast address is bound on both 234 * new and duplicated sockets. 235 */ 236 if (so->so_options & SO_REUSEADDR) 237 reuseport = SO_REUSEADDR|SO_REUSEPORT; 238 } else if (IN6_IS_ADDR_V4MAPPED(&sin6->sin6_addr)) { 239 if ((in6p->in6p_flags & IN6P_IPV6_V6ONLY) != 0) 240 return (EINVAL); 241 if (sin6->sin6_addr.s6_addr32[3]) { 242 struct sockaddr_in sin; 243 244 bzero(&sin, sizeof(sin)); 245 sin.sin_len = sizeof(sin); 246 sin.sin_family = AF_INET; 247 bcopy(&sin6->sin6_addr.s6_addr32[3], 248 &sin.sin_addr, sizeof(sin.sin_addr)); 249 if (ifa_ifwithaddr((struct sockaddr *)&sin) == 0) 250 return EADDRNOTAVAIL; 251 } 252 } else if (!IN6_IS_ADDR_UNSPECIFIED(&sin6->sin6_addr)) { 253 struct ifaddr *ia = NULL; 254 255 sin6->sin6_port = 0; /* yech... */ 256 if ((in6p->in6p_flags & IN6P_FAITH) == 0 && 257 (ia = ifa_ifwithaddr((struct sockaddr *)sin6)) == 0) 258 return (EADDRNOTAVAIL); 259 260 /* 261 * bind to an anycast address might accidentally 262 * cause sending a packet with an anycast source 263 * address, so we forbid it. 264 * 265 * We should allow to bind to a deprecated address, 266 * since the application dare to use it. 267 * But, can we assume that they are careful enough 268 * to check if the address is deprecated or not? 269 * Maybe, as a safeguard, we should have a setsockopt 270 * flag to control the bind(2) behavior against 271 * deprecated addresses (default: forbid bind(2)). 272 */ 273 if (ia && 274 ((struct in6_ifaddr *)ia)->ia6_flags & 275 (IN6_IFF_ANYCAST|IN6_IFF_NOTREADY|IN6_IFF_DETACHED)) 276 return (EADDRNOTAVAIL); 277 } 278 if (lport) { 279 #ifndef IPNOPRIVPORTS 280 int priv; 281 282 /* 283 * NOTE: all operating systems use suser() for 284 * privilege check! do not rewrite it into SS_PRIV. 285 */ 286 priv = (l && !kauth_authorize_generic(l->l_cred, 287 KAUTH_GENERIC_ISSUSER, &l->l_acflag)) ? 1 : 0; 288 /* GROSS */ 289 if (ntohs(lport) < IPV6PORT_RESERVED && !priv) 290 return (EACCES); 291 #endif 292 293 if (IN6_IS_ADDR_V4MAPPED(&sin6->sin6_addr)) { 294 #ifdef INET 295 struct inpcb *t; 296 297 t = in_pcblookup_port(table, 298 *(struct in_addr *)&sin6->sin6_addr.s6_addr32[3], 299 lport, wild); 300 if (t && (reuseport & t->inp_socket->so_options) == 0) 301 return (EADDRINUSE); 302 #else 303 return (EADDRNOTAVAIL); 304 #endif 305 } 306 307 { 308 struct in6pcb *t; 309 310 t = in6_pcblookup_port(table, &sin6->sin6_addr, 311 lport, wild); 312 if (t && (reuseport & t->in6p_socket->so_options) == 0) 313 return (EADDRINUSE); 314 } 315 } 316 in6p->in6p_laddr = sin6->sin6_addr; 317 } 318 319 if (lport == 0) { 320 int e; 321 e = in6_pcbsetport(&in6p->in6p_laddr, in6p, l); 322 if (e != 0) 323 return (e); 324 } else { 325 in6p->in6p_lport = lport; 326 in6_pcbstate(in6p, IN6P_BOUND); 327 } 328 329 LIST_REMOVE(&in6p->in6p_head, inph_lhash); 330 LIST_INSERT_HEAD(IN6PCBHASH_PORT(table, in6p->in6p_lport), 331 &in6p->in6p_head, inph_lhash); 332 333 #if 0 334 in6p->in6p_flowinfo = 0; /* XXX */ 335 #endif 336 return (0); 337 } 338 339 /* 340 * Connect from a socket to a specified address. 341 * Both address and port must be specified in argument sin6. 342 * If don't have a local address for this socket yet, 343 * then pick one. 344 */ 345 int 346 in6_pcbconnect(v, nam, l) 347 void *v; 348 struct mbuf *nam; 349 struct lwp *l; 350 { 351 struct in6pcb *in6p = v; 352 struct in6_addr *in6a = NULL; 353 struct sockaddr_in6 *sin6 = mtod(nam, struct sockaddr_in6 *); 354 struct ifnet *ifp = NULL; /* outgoing interface */ 355 int error = 0; 356 int scope_ambiguous = 0; 357 #ifdef INET 358 struct in6_addr mapped; 359 #endif 360 struct sockaddr_in6 tmp; 361 362 (void)&in6a; /* XXX fool gcc */ 363 364 if (in6p->in6p_af != AF_INET6) 365 return (EINVAL); 366 367 if (nam->m_len != sizeof(*sin6)) 368 return (EINVAL); 369 if (sin6->sin6_family != AF_INET6) 370 return (EAFNOSUPPORT); 371 if (sin6->sin6_port == 0) 372 return (EADDRNOTAVAIL); 373 374 if (sin6->sin6_scope_id == 0 && !ip6_use_defzone) 375 scope_ambiguous = 1; 376 if ((error = sa6_embedscope(sin6, ip6_use_defzone)) != 0) 377 return(error); 378 379 /* sanity check for mapped address case */ 380 if (IN6_IS_ADDR_V4MAPPED(&sin6->sin6_addr)) { 381 if ((in6p->in6p_flags & IN6P_IPV6_V6ONLY) != 0) 382 return EINVAL; 383 if (IN6_IS_ADDR_UNSPECIFIED(&in6p->in6p_laddr)) 384 in6p->in6p_laddr.s6_addr16[5] = htons(0xffff); 385 if (!IN6_IS_ADDR_V4MAPPED(&in6p->in6p_laddr)) 386 return EINVAL; 387 } else 388 { 389 if (IN6_IS_ADDR_V4MAPPED(&in6p->in6p_laddr)) 390 return EINVAL; 391 } 392 393 /* protect *sin6 from overwrites */ 394 tmp = *sin6; 395 sin6 = &tmp; 396 397 /* Source address selection. */ 398 if (IN6_IS_ADDR_V4MAPPED(&in6p->in6p_laddr) && 399 in6p->in6p_laddr.s6_addr32[3] == 0) { 400 #ifdef INET 401 struct sockaddr_in sin, *sinp; 402 403 bzero(&sin, sizeof(sin)); 404 sin.sin_len = sizeof(sin); 405 sin.sin_family = AF_INET; 406 bcopy(&sin6->sin6_addr.s6_addr32[3], &sin.sin_addr, 407 sizeof(sin.sin_addr)); 408 sinp = in_selectsrc(&sin, (struct route *)&in6p->in6p_route, 409 in6p->in6p_socket->so_options, NULL, &error); 410 if (sinp == 0) { 411 if (error == 0) 412 error = EADDRNOTAVAIL; 413 return (error); 414 } 415 bzero(&mapped, sizeof(mapped)); 416 mapped.s6_addr16[5] = htons(0xffff); 417 bcopy(&sinp->sin_addr, &mapped.s6_addr32[3], sizeof(sinp->sin_addr)); 418 in6a = &mapped; 419 #else 420 return EADDRNOTAVAIL; 421 #endif 422 } else { 423 /* 424 * XXX: in6_selectsrc might replace the bound local address 425 * with the address specified by setsockopt(IPV6_PKTINFO). 426 * Is it the intended behavior? 427 */ 428 in6a = in6_selectsrc(sin6, in6p->in6p_outputopts, 429 in6p->in6p_moptions, 430 &in6p->in6p_route, 431 &in6p->in6p_laddr, &ifp, &error); 432 if (ifp && scope_ambiguous && 433 (error = in6_setscope(&sin6->sin6_addr, ifp, NULL)) != 0) { 434 return(error); 435 } 436 437 if (in6a == 0) { 438 if (error == 0) 439 error = EADDRNOTAVAIL; 440 return (error); 441 } 442 } 443 if (ifp == NULL && in6p->in6p_route.ro_rt) 444 ifp = in6p->in6p_route.ro_rt->rt_ifp; 445 446 in6p->in6p_ip6.ip6_hlim = (u_int8_t)in6_selecthlim(in6p, ifp); 447 448 if (in6_pcblookup_connect(in6p->in6p_table, &sin6->sin6_addr, 449 sin6->sin6_port, 450 IN6_IS_ADDR_UNSPECIFIED(&in6p->in6p_laddr) ? in6a : &in6p->in6p_laddr, 451 in6p->in6p_lport, 0)) 452 return (EADDRINUSE); 453 if (IN6_IS_ADDR_UNSPECIFIED(&in6p->in6p_laddr) || 454 (IN6_IS_ADDR_V4MAPPED(&in6p->in6p_laddr) && 455 in6p->in6p_laddr.s6_addr32[3] == 0)) 456 { 457 if (in6p->in6p_lport == 0) { 458 error = in6_pcbbind(in6p, (struct mbuf *)0, l); 459 if (error != 0) 460 return error; 461 } 462 in6p->in6p_laddr = *in6a; 463 } 464 in6p->in6p_faddr = sin6->sin6_addr; 465 in6p->in6p_fport = sin6->sin6_port; 466 in6_pcbstate(in6p, IN6P_CONNECTED); 467 in6p->in6p_flowinfo &= ~IPV6_FLOWLABEL_MASK; 468 if (ip6_auto_flowlabel) 469 in6p->in6p_flowinfo |= 470 (htonl(ip6_randomflowlabel()) & IPV6_FLOWLABEL_MASK); 471 #if defined(IPSEC) || defined(FAST_IPSEC) 472 if (in6p->in6p_socket->so_type == SOCK_STREAM) 473 ipsec_pcbconn(in6p->in6p_sp); 474 #endif 475 return (0); 476 } 477 478 void 479 in6_pcbdisconnect(in6p) 480 struct in6pcb *in6p; 481 { 482 bzero((caddr_t)&in6p->in6p_faddr, sizeof(in6p->in6p_faddr)); 483 in6p->in6p_fport = 0; 484 in6_pcbstate(in6p, IN6P_BOUND); 485 in6p->in6p_flowinfo &= ~IPV6_FLOWLABEL_MASK; 486 #if defined(IPSEC) || defined(FAST_IPSEC) 487 ipsec_pcbdisconn(in6p->in6p_sp); 488 #endif 489 if (in6p->in6p_socket->so_state & SS_NOFDREF) 490 in6_pcbdetach(in6p); 491 } 492 493 void 494 in6_pcbdetach(in6p) 495 struct in6pcb *in6p; 496 { 497 struct socket *so = in6p->in6p_socket; 498 int s; 499 500 if (in6p->in6p_af != AF_INET6) 501 return; 502 503 #if defined(IPSEC) || defined(FAST_IPSEC) 504 ipsec6_delete_pcbpolicy(in6p); 505 #endif /* IPSEC */ 506 so->so_pcb = 0; 507 sofree(so); 508 if (in6p->in6p_options) 509 m_freem(in6p->in6p_options); 510 if (in6p->in6p_outputopts) { 511 if (in6p->in6p_outputopts->ip6po_rthdr && 512 in6p->in6p_outputopts->ip6po_route.ro_rt) 513 RTFREE(in6p->in6p_outputopts->ip6po_route.ro_rt); 514 if (in6p->in6p_outputopts->ip6po_m) 515 (void)m_free(in6p->in6p_outputopts->ip6po_m); 516 free(in6p->in6p_outputopts, M_IP6OPT); 517 } 518 if (in6p->in6p_route.ro_rt) 519 rtfree(in6p->in6p_route.ro_rt); 520 ip6_freemoptions(in6p->in6p_moptions); 521 s = splnet(); 522 in6_pcbstate(in6p, IN6P_ATTACHED); 523 LIST_REMOVE(&in6p->in6p_head, inph_lhash); 524 CIRCLEQ_REMOVE(&in6p->in6p_table->inpt_queue, &in6p->in6p_head, 525 inph_queue); 526 splx(s); 527 pool_put(&in6pcb_pool, in6p); 528 } 529 530 void 531 in6_setsockaddr(in6p, nam) 532 struct in6pcb *in6p; 533 struct mbuf *nam; 534 { 535 struct sockaddr_in6 *sin6; 536 537 if (in6p->in6p_af != AF_INET6) 538 return; 539 540 nam->m_len = sizeof(*sin6); 541 sin6 = mtod(nam, struct sockaddr_in6 *); 542 bzero((caddr_t)sin6, sizeof(*sin6)); 543 sin6->sin6_family = AF_INET6; 544 sin6->sin6_len = sizeof(struct sockaddr_in6); 545 sin6->sin6_port = in6p->in6p_lport; 546 sin6->sin6_addr = in6p->in6p_laddr; 547 (void)sa6_recoverscope(sin6); /* XXX: should catch errors */ 548 } 549 550 void 551 in6_setpeeraddr(in6p, nam) 552 struct in6pcb *in6p; 553 struct mbuf *nam; 554 { 555 struct sockaddr_in6 *sin6; 556 557 if (in6p->in6p_af != AF_INET6) 558 return; 559 560 nam->m_len = sizeof(*sin6); 561 sin6 = mtod(nam, struct sockaddr_in6 *); 562 bzero((caddr_t)sin6, sizeof(*sin6)); 563 sin6->sin6_family = AF_INET6; 564 sin6->sin6_len = sizeof(struct sockaddr_in6); 565 sin6->sin6_port = in6p->in6p_fport; 566 sin6->sin6_addr = in6p->in6p_faddr; 567 (void)sa6_recoverscope(sin6); /* XXX: should catch errors */ 568 } 569 570 /* 571 * Pass some notification to all connections of a protocol 572 * associated with address dst. The local address and/or port numbers 573 * may be specified to limit the search. The "usual action" will be 574 * taken, depending on the ctlinput cmd. The caller must filter any 575 * cmds that are uninteresting (e.g., no error in the map). 576 * Call the protocol specific routine (if any) to report 577 * any errors for each matching socket. 578 * 579 * Must be called at splsoftnet. 580 * 581 * Note: src (4th arg) carries the flowlabel value on the original IPv6 582 * header, in sin6_flowinfo member. 583 */ 584 int 585 in6_pcbnotify(table, dst, fport_arg, src, lport_arg, cmd, cmdarg, notify) 586 struct inpcbtable *table; 587 struct sockaddr *dst; 588 const struct sockaddr *src; 589 u_int fport_arg, lport_arg; 590 int cmd; 591 void *cmdarg; 592 void (*notify) __P((struct in6pcb *, int)); 593 { 594 struct in6pcb *in6p, *nin6p; 595 struct sockaddr_in6 sa6_src, *sa6_dst; 596 u_int16_t fport = fport_arg, lport = lport_arg; 597 int errno; 598 int nmatch = 0; 599 u_int32_t flowinfo; 600 601 if ((unsigned)cmd >= PRC_NCMDS || dst->sa_family != AF_INET6) 602 return 0; 603 604 sa6_dst = (struct sockaddr_in6 *)dst; 605 if (IN6_IS_ADDR_UNSPECIFIED(&sa6_dst->sin6_addr)) 606 return 0; 607 608 /* 609 * note that src can be NULL when we get notify by local fragmentation. 610 */ 611 sa6_src = (src == NULL) ? sa6_any : *(const struct sockaddr_in6 *)src; 612 flowinfo = sa6_src.sin6_flowinfo; 613 614 /* 615 * Redirects go to all references to the destination, 616 * and use in6_rtchange to invalidate the route cache. 617 * Dead host indications: also use in6_rtchange to invalidate 618 * the cache, and deliver the error to all the sockets. 619 * Otherwise, if we have knowledge of the local port and address, 620 * deliver only to that socket. 621 */ 622 if (PRC_IS_REDIRECT(cmd) || cmd == PRC_HOSTDEAD) { 623 fport = 0; 624 lport = 0; 625 bzero((caddr_t)&sa6_src.sin6_addr, sizeof(sa6_src.sin6_addr)); 626 627 if (cmd != PRC_HOSTDEAD) 628 notify = in6_rtchange; 629 } 630 631 errno = inet6ctlerrmap[cmd]; 632 for (in6p = (struct in6pcb *)CIRCLEQ_FIRST(&table->inpt_queue); 633 in6p != (void *)&table->inpt_queue; 634 in6p = nin6p) { 635 nin6p = (struct in6pcb *)CIRCLEQ_NEXT(in6p, in6p_queue); 636 637 if (in6p->in6p_af != AF_INET6) 638 continue; 639 640 /* 641 * Under the following condition, notify of redirects 642 * to the pcb, without making address matches against inpcb. 643 * - redirect notification is arrived. 644 * - the inpcb is unconnected. 645 * - the inpcb is caching !RTF_HOST routing entry. 646 * - the ICMPv6 notification is from the gateway cached in the 647 * inpcb. i.e. ICMPv6 notification is from nexthop gateway 648 * the inpcb used very recently. 649 * 650 * This is to improve interaction between netbsd/openbsd 651 * redirect handling code, and inpcb route cache code. 652 * without the clause, !RTF_HOST routing entry (which carries 653 * gateway used by inpcb right before the ICMPv6 redirect) 654 * will be cached forever in unconnected inpcb. 655 * 656 * There still is a question regarding to what is TRT: 657 * - On bsdi/freebsd, RTF_HOST (cloned) routing entry will be 658 * generated on packet output. inpcb will always cache 659 * RTF_HOST routing entry so there's no need for the clause 660 * (ICMPv6 redirect will update RTF_HOST routing entry, 661 * and inpcb is caching it already). 662 * However, bsdi/freebsd are vulnerable to local DoS attacks 663 * due to the cloned routing entries. 664 * - Specwise, "destination cache" is mentioned in RFC2461. 665 * Jinmei says that it implies bsdi/freebsd behavior, itojun 666 * is not really convinced. 667 * - Having hiwat/lowat on # of cloned host route (redirect/ 668 * pmtud) may be a good idea. netbsd/openbsd has it. see 669 * icmp6_mtudisc_update(). 670 */ 671 if ((PRC_IS_REDIRECT(cmd) || cmd == PRC_HOSTDEAD) && 672 IN6_IS_ADDR_UNSPECIFIED(&in6p->in6p_laddr) && 673 in6p->in6p_route.ro_rt && 674 !(in6p->in6p_route.ro_rt->rt_flags & RTF_HOST)) { 675 struct sockaddr_in6 *dst6; 676 677 dst6 = (struct sockaddr_in6 *)&in6p->in6p_route.ro_dst; 678 if (IN6_ARE_ADDR_EQUAL(&dst6->sin6_addr, 679 &sa6_dst->sin6_addr)) 680 goto do_notify; 681 } 682 683 /* 684 * If the error designates a new path MTU for a destination 685 * and the application (associated with this socket) wanted to 686 * know the value, notify. Note that we notify for all 687 * disconnected sockets if the corresponding application 688 * wanted. This is because some UDP applications keep sending 689 * sockets disconnected. 690 * XXX: should we avoid to notify the value to TCP sockets? 691 */ 692 if (cmd == PRC_MSGSIZE && (in6p->in6p_flags & IN6P_MTU) != 0 && 693 (IN6_IS_ADDR_UNSPECIFIED(&in6p->in6p_faddr) || 694 IN6_ARE_ADDR_EQUAL(&in6p->in6p_faddr, &sa6_dst->sin6_addr))) { 695 ip6_notify_pmtu(in6p, (struct sockaddr_in6 *)dst, 696 (u_int32_t *)cmdarg); 697 } 698 699 /* 700 * Detect if we should notify the error. If no source and 701 * destination ports are specified, but non-zero flowinfo and 702 * local address match, notify the error. This is the case 703 * when the error is delivered with an encrypted buffer 704 * by ESP. Otherwise, just compare addresses and ports 705 * as usual. 706 */ 707 if (lport == 0 && fport == 0 && flowinfo && 708 in6p->in6p_socket != NULL && 709 flowinfo == (in6p->in6p_flowinfo & IPV6_FLOWLABEL_MASK) && 710 IN6_ARE_ADDR_EQUAL(&in6p->in6p_laddr, &sa6_src.sin6_addr)) 711 goto do_notify; 712 else if (!IN6_ARE_ADDR_EQUAL(&in6p->in6p_faddr, 713 &sa6_dst->sin6_addr) || 714 in6p->in6p_socket == 0 || 715 (lport && in6p->in6p_lport != lport) || 716 (!IN6_IS_ADDR_UNSPECIFIED(&sa6_src.sin6_addr) && 717 !IN6_ARE_ADDR_EQUAL(&in6p->in6p_laddr, 718 &sa6_src.sin6_addr)) || 719 (fport && in6p->in6p_fport != fport)) 720 continue; 721 722 do_notify: 723 if (notify) 724 (*notify)(in6p, errno); 725 nmatch++; 726 } 727 return nmatch; 728 } 729 730 void 731 in6_pcbpurgeif0(table, ifp) 732 struct inpcbtable *table; 733 struct ifnet *ifp; 734 { 735 struct in6pcb *in6p, *nin6p; 736 struct ip6_moptions *im6o; 737 struct in6_multi_mship *imm, *nimm; 738 739 for (in6p = (struct in6pcb *)CIRCLEQ_FIRST(&table->inpt_queue); 740 in6p != (void *)&table->inpt_queue; 741 in6p = nin6p) { 742 nin6p = (struct in6pcb *)CIRCLEQ_NEXT(in6p, in6p_queue); 743 if (in6p->in6p_af != AF_INET6) 744 continue; 745 746 im6o = in6p->in6p_moptions; 747 if (im6o) { 748 /* 749 * Unselect the outgoing interface if it is being 750 * detached. 751 */ 752 if (im6o->im6o_multicast_ifp == ifp) 753 im6o->im6o_multicast_ifp = NULL; 754 755 /* 756 * Drop multicast group membership if we joined 757 * through the interface being detached. 758 * XXX controversial - is it really legal for kernel 759 * to force this? 760 */ 761 for (imm = im6o->im6o_memberships.lh_first; 762 imm != NULL; imm = nimm) { 763 nimm = imm->i6mm_chain.le_next; 764 if (imm->i6mm_maddr->in6m_ifp == ifp) { 765 LIST_REMOVE(imm, i6mm_chain); 766 in6_leavegroup(imm); 767 } 768 } 769 } 770 } 771 } 772 773 void 774 in6_pcbpurgeif(table, ifp) 775 struct inpcbtable *table; 776 struct ifnet *ifp; 777 { 778 struct in6pcb *in6p, *nin6p; 779 780 for (in6p = (struct in6pcb *)CIRCLEQ_FIRST(&table->inpt_queue); 781 in6p != (void *)&table->inpt_queue; 782 in6p = nin6p) { 783 nin6p = (struct in6pcb *)CIRCLEQ_NEXT(in6p, in6p_queue); 784 if (in6p->in6p_af != AF_INET6) 785 continue; 786 if (in6p->in6p_route.ro_rt != NULL && 787 in6p->in6p_route.ro_rt->rt_ifp == ifp) 788 in6_rtchange(in6p, 0); 789 } 790 } 791 792 /* 793 * Check for alternatives when higher level complains 794 * about service problems. For now, invalidate cached 795 * routing information. If the route was created dynamically 796 * (by a redirect), time to try a default gateway again. 797 */ 798 void 799 in6_losing(in6p) 800 struct in6pcb *in6p; 801 { 802 struct rtentry *rt; 803 struct rt_addrinfo info; 804 805 if (in6p->in6p_af != AF_INET6) 806 return; 807 808 if ((rt = in6p->in6p_route.ro_rt) != NULL) { 809 in6p->in6p_route.ro_rt = 0; 810 bzero((caddr_t)&info, sizeof(info)); 811 info.rti_info[RTAX_DST] = 812 (struct sockaddr *)&in6p->in6p_route.ro_dst; 813 info.rti_info[RTAX_GATEWAY] = rt->rt_gateway; 814 info.rti_info[RTAX_NETMASK] = rt_mask(rt); 815 rt_missmsg(RTM_LOSING, &info, rt->rt_flags, 0); 816 if (rt->rt_flags & RTF_DYNAMIC) { 817 (void)rtrequest(RTM_DELETE, rt_key(rt), 818 rt->rt_gateway, rt_mask(rt), rt->rt_flags, 819 (struct rtentry **)0); 820 } else { 821 /* 822 * A new route can be allocated 823 * the next time output is attempted. 824 */ 825 rtfree(rt); 826 } 827 } 828 } 829 830 /* 831 * After a routing change, flush old routing 832 * and allocate a (hopefully) better one. 833 */ 834 void 835 in6_rtchange(in6p, errno) 836 struct in6pcb *in6p; 837 int errno; 838 { 839 if (in6p->in6p_af != AF_INET6) 840 return; 841 842 if (in6p->in6p_route.ro_rt) { 843 rtfree(in6p->in6p_route.ro_rt); 844 in6p->in6p_route.ro_rt = 0; 845 /* 846 * A new route can be allocated the next time 847 * output is attempted. 848 */ 849 } 850 } 851 852 struct in6pcb * 853 in6_pcblookup_port(table, laddr6, lport_arg, lookup_wildcard) 854 struct inpcbtable *table; 855 struct in6_addr *laddr6; 856 u_int lport_arg; 857 int lookup_wildcard; 858 { 859 struct inpcbhead *head; 860 struct inpcb_hdr *inph; 861 struct in6pcb *in6p, *match = 0; 862 int matchwild = 3, wildcard; 863 u_int16_t lport = lport_arg; 864 865 head = IN6PCBHASH_PORT(table, lport); 866 LIST_FOREACH(inph, head, inph_lhash) { 867 in6p = (struct in6pcb *)inph; 868 if (in6p->in6p_af != AF_INET6) 869 continue; 870 871 if (in6p->in6p_lport != lport) 872 continue; 873 wildcard = 0; 874 if (IN6_IS_ADDR_V4MAPPED(&in6p->in6p_faddr)) { 875 if ((in6p->in6p_flags & IN6P_IPV6_V6ONLY) != 0) 876 continue; 877 } 878 if (!IN6_IS_ADDR_UNSPECIFIED(&in6p->in6p_faddr)) 879 wildcard++; 880 if (IN6_IS_ADDR_V4MAPPED(&in6p->in6p_laddr)) { 881 if ((in6p->in6p_flags & IN6P_IPV6_V6ONLY) != 0) 882 continue; 883 if (!IN6_IS_ADDR_V4MAPPED(laddr6)) 884 continue; 885 886 /* duplicate of IPv4 logic */ 887 wildcard = 0; 888 if (IN6_IS_ADDR_V4MAPPED(&in6p->in6p_faddr) && 889 in6p->in6p_faddr.s6_addr32[3]) 890 wildcard++; 891 if (!in6p->in6p_laddr.s6_addr32[3]) { 892 if (laddr6->s6_addr32[3]) 893 wildcard++; 894 } else { 895 if (!laddr6->s6_addr32[3]) 896 wildcard++; 897 else { 898 if (in6p->in6p_laddr.s6_addr32[3] != 899 laddr6->s6_addr32[3]) 900 continue; 901 } 902 } 903 } else if (IN6_IS_ADDR_UNSPECIFIED(&in6p->in6p_laddr)) { 904 if (IN6_IS_ADDR_V4MAPPED(laddr6)) { 905 if ((in6p->in6p_flags & IN6P_IPV6_V6ONLY) != 0) 906 continue; 907 } 908 if (!IN6_IS_ADDR_UNSPECIFIED(laddr6)) 909 wildcard++; 910 } else { 911 if (IN6_IS_ADDR_V4MAPPED(laddr6)) { 912 if ((in6p->in6p_flags & IN6P_IPV6_V6ONLY) != 0) 913 continue; 914 } 915 if (IN6_IS_ADDR_UNSPECIFIED(laddr6)) 916 wildcard++; 917 else { 918 if (!IN6_ARE_ADDR_EQUAL(&in6p->in6p_laddr, 919 laddr6)) 920 continue; 921 } 922 } 923 if (wildcard && !lookup_wildcard) 924 continue; 925 if (wildcard < matchwild) { 926 match = in6p; 927 matchwild = wildcard; 928 if (matchwild == 0) 929 break; 930 } 931 } 932 return (match); 933 } 934 #undef continue 935 936 /* 937 * WARNING: return value (rtentry) could be IPv4 one if in6pcb is connected to 938 * IPv4 mapped address. 939 */ 940 struct rtentry * 941 in6_pcbrtentry(in6p) 942 struct in6pcb *in6p; 943 { 944 struct route_in6 *ro; 945 struct sockaddr_in6 *dst6; 946 947 ro = &in6p->in6p_route; 948 dst6 = (struct sockaddr_in6 *)&ro->ro_dst; 949 950 if (in6p->in6p_af != AF_INET6) 951 return (NULL); 952 953 if (ro->ro_rt && ((ro->ro_rt->rt_flags & RTF_UP) == 0 || 954 !IN6_ARE_ADDR_EQUAL(&dst6->sin6_addr, &in6p->in6p_faddr))) { 955 RTFREE(ro->ro_rt); 956 ro->ro_rt = (struct rtentry *)NULL; 957 } 958 #ifdef INET 959 if (ro->ro_rt == (struct rtentry *)NULL && 960 IN6_IS_ADDR_V4MAPPED(&in6p->in6p_faddr)) { 961 struct sockaddr_in *dst = (struct sockaddr_in *)&ro->ro_dst; 962 963 bzero(dst, sizeof(*dst)); 964 dst->sin_family = AF_INET; 965 dst->sin_len = sizeof(struct sockaddr_in); 966 bcopy(&in6p->in6p_faddr.s6_addr32[3], &dst->sin_addr, 967 sizeof(dst->sin_addr)); 968 rtalloc((struct route *)ro); 969 } else 970 #endif 971 if (ro->ro_rt == (struct rtentry *)NULL && 972 !IN6_IS_ADDR_UNSPECIFIED(&in6p->in6p_faddr)) { 973 bzero(dst6, sizeof(*dst6)); 974 dst6->sin6_family = AF_INET6; 975 dst6->sin6_len = sizeof(struct sockaddr_in6); 976 dst6->sin6_addr = in6p->in6p_faddr; 977 rtalloc((struct route *)ro); 978 } 979 return (ro->ro_rt); 980 } 981 982 struct in6pcb * 983 in6_pcblookup_connect(table, faddr6, fport_arg, laddr6, lport_arg, faith) 984 struct inpcbtable *table; 985 struct in6_addr *faddr6; 986 const struct in6_addr *laddr6; 987 u_int fport_arg, lport_arg; 988 int faith; 989 { 990 struct inpcbhead *head; 991 struct inpcb_hdr *inph; 992 struct in6pcb *in6p; 993 u_int16_t fport = fport_arg, lport = lport_arg; 994 995 head = IN6PCBHASH_CONNECT(table, faddr6, fport, laddr6, lport); 996 LIST_FOREACH(inph, head, inph_hash) { 997 in6p = (struct in6pcb *)inph; 998 if (in6p->in6p_af != AF_INET6) 999 continue; 1000 1001 /* find exact match on both source and dest */ 1002 if (in6p->in6p_fport != fport) 1003 continue; 1004 if (in6p->in6p_lport != lport) 1005 continue; 1006 if (IN6_IS_ADDR_UNSPECIFIED(&in6p->in6p_faddr)) 1007 continue; 1008 if (!IN6_ARE_ADDR_EQUAL(&in6p->in6p_faddr, faddr6)) 1009 continue; 1010 if (IN6_IS_ADDR_UNSPECIFIED(&in6p->in6p_laddr)) 1011 continue; 1012 if (!IN6_ARE_ADDR_EQUAL(&in6p->in6p_laddr, laddr6)) 1013 continue; 1014 if ((IN6_IS_ADDR_V4MAPPED(laddr6) || 1015 IN6_IS_ADDR_V4MAPPED(faddr6)) && 1016 (in6p->in6p_flags & IN6P_IPV6_V6ONLY)) 1017 continue; 1018 return in6p; 1019 } 1020 return NULL; 1021 } 1022 1023 struct in6pcb * 1024 in6_pcblookup_bind(table, laddr6, lport_arg, faith) 1025 struct inpcbtable *table; 1026 struct in6_addr *laddr6; 1027 u_int lport_arg; 1028 int faith; 1029 { 1030 struct inpcbhead *head; 1031 struct inpcb_hdr *inph; 1032 struct in6pcb *in6p; 1033 u_int16_t lport = lport_arg; 1034 #ifdef INET 1035 struct in6_addr zero_mapped; 1036 #endif 1037 1038 head = IN6PCBHASH_BIND(table, laddr6, lport); 1039 LIST_FOREACH(inph, head, inph_hash) { 1040 in6p = (struct in6pcb *)inph; 1041 if (in6p->in6p_af != AF_INET6) 1042 continue; 1043 1044 if (faith && (in6p->in6p_flags & IN6P_FAITH) == 0) 1045 continue; 1046 if (in6p->in6p_fport != 0) 1047 continue; 1048 if (in6p->in6p_lport != lport) 1049 continue; 1050 if (IN6_IS_ADDR_V4MAPPED(laddr6) && 1051 (in6p->in6p_flags & IN6P_IPV6_V6ONLY) != 0) 1052 continue; 1053 if (IN6_ARE_ADDR_EQUAL(&in6p->in6p_laddr, laddr6)) 1054 goto out; 1055 } 1056 #ifdef INET 1057 if (IN6_IS_ADDR_V4MAPPED(laddr6)) { 1058 memset(&zero_mapped, 0, sizeof(zero_mapped)); 1059 zero_mapped.s6_addr16[5] = 0xffff; 1060 head = IN6PCBHASH_BIND(table, &zero_mapped, lport); 1061 LIST_FOREACH(inph, head, inph_hash) { 1062 in6p = (struct in6pcb *)inph; 1063 if (in6p->in6p_af != AF_INET6) 1064 continue; 1065 1066 if (faith && (in6p->in6p_flags & IN6P_FAITH) == 0) 1067 continue; 1068 if (in6p->in6p_fport != 0) 1069 continue; 1070 if (in6p->in6p_lport != lport) 1071 continue; 1072 if ((in6p->in6p_flags & IN6P_IPV6_V6ONLY) != 0) 1073 continue; 1074 if (IN6_ARE_ADDR_EQUAL(&in6p->in6p_laddr, &zero_mapped)) 1075 goto out; 1076 } 1077 } 1078 #endif 1079 head = IN6PCBHASH_BIND(table, &zeroin6_addr, lport); 1080 LIST_FOREACH(inph, head, inph_hash) { 1081 in6p = (struct in6pcb *)inph; 1082 if (in6p->in6p_af != AF_INET6) 1083 continue; 1084 1085 if (faith && (in6p->in6p_flags & IN6P_FAITH) == 0) 1086 continue; 1087 if (in6p->in6p_fport != 0) 1088 continue; 1089 if (in6p->in6p_lport != lport) 1090 continue; 1091 if (IN6_IS_ADDR_V4MAPPED(laddr6) && 1092 (in6p->in6p_flags & IN6P_IPV6_V6ONLY) != 0) 1093 continue; 1094 if (IN6_ARE_ADDR_EQUAL(&in6p->in6p_laddr, &zeroin6_addr)) 1095 goto out; 1096 } 1097 return (NULL); 1098 1099 out: 1100 inph = &in6p->in6p_head; 1101 if (inph != LIST_FIRST(head)) { 1102 LIST_REMOVE(inph, inph_hash); 1103 LIST_INSERT_HEAD(head, inph, inph_hash); 1104 } 1105 return in6p; 1106 } 1107 1108 void 1109 in6_pcbstate(in6p, state) 1110 struct in6pcb *in6p; 1111 int state; 1112 { 1113 1114 if (in6p->in6p_af != AF_INET6) 1115 return; 1116 1117 if (in6p->in6p_state > IN6P_ATTACHED) 1118 LIST_REMOVE(&in6p->in6p_head, inph_hash); 1119 1120 switch (state) { 1121 case IN6P_BOUND: 1122 LIST_INSERT_HEAD(IN6PCBHASH_BIND(in6p->in6p_table, 1123 &in6p->in6p_laddr, in6p->in6p_lport), &in6p->in6p_head, 1124 inph_hash); 1125 break; 1126 case IN6P_CONNECTED: 1127 LIST_INSERT_HEAD(IN6PCBHASH_CONNECT(in6p->in6p_table, 1128 &in6p->in6p_faddr, in6p->in6p_fport, 1129 &in6p->in6p_laddr, in6p->in6p_lport), &in6p->in6p_head, 1130 inph_hash); 1131 break; 1132 } 1133 1134 in6p->in6p_state = state; 1135 } 1136
Indexes created Sun Oct 19 02:09:48 GMT 2025