Now available: The Design and Implementation of the FreeBSD Operating System (Second Edition)
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sys/netinet6/in6_pcb.c
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1 /* $NetBSD: in6_pcb.c,v 1.61.2.1 2004/04/28 05:56:07 jmc 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 1.61.2.1 2004/04/28 05:56:07 jmc 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 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 #ifdef FAST_IPSEC 105 #include <netipsec/ipsec.h> 106 #include <netipsec/ipsec6.h> 107 #include <netipsec/key.h> 108 #endif /* FAST_IPSEC */ 109 110 struct in6_addr zeroin6_addr; 111 112 #define IN6PCBHASH_PORT(table, lport) \ 113 &(table)->inpt_porthashtbl[ntohs(lport) & (table)->inpt_porthash] 114 #define IN6PCBHASH_BIND(table, laddr, lport) \ 115 &(table)->inpt_bindhashtbl[ \ 116 (((laddr)->s6_addr32[0] ^ (laddr)->s6_addr32[1] ^ \ 117 (laddr)->s6_addr32[2] ^ (laddr)->s6_addr32[3]) + ntohs(lport)) & \ 118 (table)->inpt_bindhash] 119 #define IN6PCBHASH_CONNECT(table, faddr, fport, laddr, lport) \ 120 &(table)->inpt_bindhashtbl[ \ 121 ((((faddr)->s6_addr32[0] ^ (faddr)->s6_addr32[1] ^ \ 122 (faddr)->s6_addr32[2] ^ (faddr)->s6_addr32[3]) + ntohs(fport)) + \ 123 (((laddr)->s6_addr32[0] ^ (laddr)->s6_addr32[1] ^ \ 124 (laddr)->s6_addr32[2] ^ (laddr)->s6_addr32[3]) + \ 125 ntohs(lport))) & (table)->inpt_bindhash] 126 127 int ip6_anonportmin = IPV6PORT_ANONMIN; 128 int ip6_anonportmax = IPV6PORT_ANONMAX; 129 int ip6_lowportmin = IPV6PORT_RESERVEDMIN; 130 int ip6_lowportmax = IPV6PORT_RESERVEDMAX; 131 132 struct pool in6pcb_pool; 133 134 void 135 in6_pcbinit(table, bindhashsize, connecthashsize) 136 struct inpcbtable *table; 137 int bindhashsize, connecthashsize; 138 { 139 static int in6pcb_pool_initialized; 140 141 if (in6pcb_pool_initialized == 0) { 142 pool_init(&in6pcb_pool, sizeof(struct in6pcb), 0, 0, 0, 143 "in6pcbpl", NULL); 144 in6pcb_pool_initialized = 1; 145 } 146 147 in_pcbinit(table, bindhashsize, connecthashsize); 148 table->inpt_lastport = (u_int16_t)ip6_anonportmax; 149 } 150 151 int 152 in6_pcballoc(so, v) 153 struct socket *so; 154 void *v; 155 { 156 struct inpcbtable *table = v; 157 struct in6pcb *in6p; 158 int s; 159 #if defined(IPSEC) || defined(FAST_IPSEC) 160 int error; 161 #endif 162 163 in6p = pool_get(&in6pcb_pool, PR_NOWAIT); 164 if (in6p == NULL) 165 return (ENOBUFS); 166 bzero((caddr_t)in6p, sizeof(*in6p)); 167 in6p->in6p_af = AF_INET6; 168 in6p->in6p_table = table; 169 in6p->in6p_socket = so; 170 in6p->in6p_hops = -1; /* use kernel default */ 171 in6p->in6p_icmp6filt = NULL; 172 #if defined(IPSEC) || defined(FAST_IPSEC) 173 error = ipsec_init_pcbpolicy(so, &in6p->in6p_sp); 174 if (error != 0) { 175 pool_put(&in6pcb_pool, in6p); 176 return error; 177 } 178 #endif /* IPSEC */ 179 s = splnet(); 180 CIRCLEQ_INSERT_HEAD(&table->inpt_queue, (struct inpcb_hdr*)in6p, 181 inph_queue); 182 LIST_INSERT_HEAD(IN6PCBHASH_PORT(table, in6p->in6p_lport), 183 &in6p->in6p_head, inph_lhash); 184 in6_pcbstate(in6p, IN6P_ATTACHED); 185 splx(s); 186 if (ip6_v6only) 187 in6p->in6p_flags |= IN6P_IPV6_V6ONLY; 188 so->so_pcb = (caddr_t)in6p; 189 return (0); 190 } 191 192 int 193 in6_pcbbind(v, nam, p) 194 void *v; 195 struct mbuf *nam; 196 struct proc *p; 197 { 198 struct in6pcb *in6p = v; 199 struct socket *so = in6p->in6p_socket; 200 struct inpcbtable *table = in6p->in6p_table; 201 struct sockaddr_in6 *sin6 = (struct sockaddr_in6 *)NULL; 202 u_int16_t lport = 0; 203 int wild = 0, reuseport = (so->so_options & SO_REUSEPORT); 204 205 if (in6p->in6p_af != AF_INET6) 206 return (EINVAL); 207 208 if (in6p->in6p_lport || !IN6_IS_ADDR_UNSPECIFIED(&in6p->in6p_laddr)) 209 return (EINVAL); 210 if ((so->so_options & (SO_REUSEADDR|SO_REUSEPORT)) == 0 && 211 ((so->so_proto->pr_flags & PR_CONNREQUIRED) == 0 || 212 (so->so_options & SO_ACCEPTCONN) == 0)) 213 wild = 1; 214 if (nam) { 215 sin6 = mtod(nam, struct sockaddr_in6 *); 216 if (nam->m_len != sizeof(*sin6)) 217 return (EINVAL); 218 /* 219 * We should check the family, but old programs 220 * incorrectly fail to intialize it. 221 */ 222 if (sin6->sin6_family != AF_INET6) 223 return (EAFNOSUPPORT); 224 225 #ifndef INET 226 if (IN6_IS_ADDR_V4MAPPED(&sin6->sin6_addr)) 227 return (EADDRNOTAVAIL); 228 #endif 229 230 /* KAME hack: embed scopeid */ 231 if (in6_embedscope(&sin6->sin6_addr, sin6, in6p, NULL) != 0) 232 return EINVAL; 233 /* this must be cleared for ifa_ifwithaddr() */ 234 sin6->sin6_scope_id = 0; 235 236 lport = sin6->sin6_port; 237 if (IN6_IS_ADDR_MULTICAST(&sin6->sin6_addr)) { 238 /* 239 * Treat SO_REUSEADDR as SO_REUSEPORT for multicast; 240 * allow compepte duplication of binding if 241 * SO_REUSEPORT is set, or if SO_REUSEADDR is set 242 * and a multicast address is bound on both 243 * new and duplicated sockets. 244 */ 245 if (so->so_options & SO_REUSEADDR) 246 reuseport = SO_REUSEADDR|SO_REUSEPORT; 247 } 248 else if (IN6_IS_ADDR_V4MAPPED(&sin6->sin6_addr)) { 249 if ((in6p->in6p_flags & IN6P_IPV6_V6ONLY) != 0) 250 return (EINVAL); 251 if (sin6->sin6_addr.s6_addr32[3]) { 252 struct sockaddr_in sin; 253 254 bzero(&sin, sizeof(sin)); 255 sin.sin_len = sizeof(sin); 256 sin.sin_family = AF_INET; 257 bcopy(&sin6->sin6_addr.s6_addr32[3], 258 &sin.sin_addr, sizeof(sin.sin_addr)); 259 if (ifa_ifwithaddr((struct sockaddr *)&sin) == 0) 260 return EADDRNOTAVAIL; 261 } 262 } 263 else if (!IN6_IS_ADDR_UNSPECIFIED(&sin6->sin6_addr)) { 264 struct ifaddr *ia = NULL; 265 266 sin6->sin6_port = 0; /* yech... */ 267 if ((in6p->in6p_flags & IN6P_FAITH) == 0 && 268 (ia = ifa_ifwithaddr((struct sockaddr *)sin6)) == 0) 269 return (EADDRNOTAVAIL); 270 271 /* 272 * bind to an anycast address might accidentally 273 * cause sending a packet with an anycast source 274 * address, so we forbid it. 275 * 276 * We should allow to bind to a deprecated address, 277 * since the application dare to use it. 278 * But, can we assume that they are careful enough 279 * to check if the address is deprecated or not? 280 * Maybe, as a safeguard, we should have a setsockopt 281 * flag to control the bind(2) behavior against 282 * deprecated addresses (default: forbid bind(2)). 283 */ 284 if (ia && 285 ((struct in6_ifaddr *)ia)->ia6_flags & 286 (IN6_IFF_ANYCAST|IN6_IFF_NOTREADY|IN6_IFF_DETACHED)) 287 return (EADDRNOTAVAIL); 288 } 289 if (lport) { 290 #ifndef IPNOPRIVPORTS 291 int priv; 292 293 /* 294 * NOTE: all operating systems use suser() for 295 * privilege check! do not rewrite it into SS_PRIV. 296 */ 297 priv = (p && !suser(p->p_ucred, &p->p_acflag)) ? 1 : 0; 298 /* GROSS */ 299 if (ntohs(lport) < IPV6PORT_RESERVED && !priv) 300 return (EACCES); 301 #endif 302 303 if (IN6_IS_ADDR_V4MAPPED(&sin6->sin6_addr)) { 304 #ifdef INET 305 struct inpcb *t; 306 307 t = in_pcblookup_port(table, 308 *(struct in_addr *)&sin6->sin6_addr.s6_addr32[3], 309 lport, wild); 310 if (t && (reuseport & t->inp_socket->so_options) == 0) 311 return (EADDRINUSE); 312 #else 313 return (EADDRNOTAVAIL); 314 #endif 315 } 316 317 { 318 struct in6pcb *t; 319 320 t = in6_pcblookup_port(table, &sin6->sin6_addr, 321 lport, wild); 322 if (t && (reuseport & t->in6p_socket->so_options) == 0) 323 return (EADDRINUSE); 324 } 325 } 326 in6p->in6p_laddr = sin6->sin6_addr; 327 } 328 329 if (lport == 0) { 330 int e; 331 e = in6_pcbsetport(&in6p->in6p_laddr, in6p, p); 332 if (e != 0) 333 return (e); 334 } else { 335 in6p->in6p_lport = lport; 336 in6_pcbstate(in6p, IN6P_BOUND); 337 } 338 339 LIST_REMOVE(&in6p->in6p_head, inph_lhash); 340 LIST_INSERT_HEAD(IN6PCBHASH_PORT(table, in6p->in6p_lport), 341 &in6p->in6p_head, inph_lhash); 342 343 #if 0 344 in6p->in6p_flowinfo = 0; /* XXX */ 345 #endif 346 return (0); 347 } 348 349 /* 350 * Connect from a socket to a specified address. 351 * Both address and port must be specified in argument sin6. 352 * If don't have a local address for this socket yet, 353 * then pick one. 354 */ 355 int 356 in6_pcbconnect(v, nam) 357 void *v; 358 struct mbuf *nam; 359 { 360 struct in6pcb *in6p = v; 361 struct in6_addr *in6a = NULL; 362 struct sockaddr_in6 *sin6 = mtod(nam, struct sockaddr_in6 *); 363 struct ifnet *ifp = NULL; /* outgoing interface */ 364 int error = 0; 365 #ifdef INET 366 struct in6_addr mapped; 367 #endif 368 struct sockaddr_in6 tmp; 369 370 (void)&in6a; /* XXX fool gcc */ 371 372 if (in6p->in6p_af != AF_INET6) 373 return (EINVAL); 374 375 if (nam->m_len != sizeof(*sin6)) 376 return (EINVAL); 377 if (sin6->sin6_family != AF_INET6) 378 return (EAFNOSUPPORT); 379 if (sin6->sin6_port == 0) 380 return (EADDRNOTAVAIL); 381 382 /* sanity check for mapped address case */ 383 if (IN6_IS_ADDR_V4MAPPED(&sin6->sin6_addr)) { 384 if ((in6p->in6p_flags & IN6P_IPV6_V6ONLY) != 0) 385 return EINVAL; 386 if (IN6_IS_ADDR_UNSPECIFIED(&in6p->in6p_laddr)) 387 in6p->in6p_laddr.s6_addr16[5] = htons(0xffff); 388 if (!IN6_IS_ADDR_V4MAPPED(&in6p->in6p_laddr)) 389 return EINVAL; 390 } else 391 { 392 if (IN6_IS_ADDR_V4MAPPED(&in6p->in6p_laddr)) 393 return EINVAL; 394 } 395 396 /* protect *sin6 from overwrites */ 397 tmp = *sin6; 398 sin6 = &tmp; 399 400 /* KAME hack: embed scopeid */ 401 if (in6_embedscope(&sin6->sin6_addr, sin6, in6p, &ifp) != 0) 402 return EINVAL; 403 404 /* Source address selection. */ 405 if (IN6_IS_ADDR_V4MAPPED(&in6p->in6p_laddr) && 406 in6p->in6p_laddr.s6_addr32[3] == 0) { 407 #ifdef INET 408 struct sockaddr_in sin, *sinp; 409 410 bzero(&sin, sizeof(sin)); 411 sin.sin_len = sizeof(sin); 412 sin.sin_family = AF_INET; 413 bcopy(&sin6->sin6_addr.s6_addr32[3], &sin.sin_addr, 414 sizeof(sin.sin_addr)); 415 sinp = in_selectsrc(&sin, (struct route *)&in6p->in6p_route, 416 in6p->in6p_socket->so_options, NULL, &error); 417 if (sinp == 0) { 418 if (error == 0) 419 error = EADDRNOTAVAIL; 420 return (error); 421 } 422 bzero(&mapped, sizeof(mapped)); 423 mapped.s6_addr16[5] = htons(0xffff); 424 bcopy(&sinp->sin_addr, &mapped.s6_addr32[3], sizeof(sinp->sin_addr)); 425 in6a = &mapped; 426 #else 427 return EADDRNOTAVAIL; 428 #endif 429 } else 430 { 431 /* 432 * XXX: in6_selectsrc might replace the bound local address 433 * with the address specified by setsockopt(IPV6_PKTINFO). 434 * Is it the intended behavior? 435 */ 436 in6a = in6_selectsrc(sin6, in6p->in6p_outputopts, 437 in6p->in6p_moptions, 438 &in6p->in6p_route, 439 &in6p->in6p_laddr, &error); 440 if (in6a == 0) { 441 if (error == 0) 442 error = EADDRNOTAVAIL; 443 return (error); 444 } 445 } 446 if (in6p->in6p_route.ro_rt) 447 ifp = in6p->in6p_route.ro_rt->rt_ifp; 448 449 in6p->in6p_ip6.ip6_hlim = (u_int8_t)in6_selecthlim(in6p, ifp); 450 451 if (in6_pcblookup_connect(in6p->in6p_table, &sin6->sin6_addr, 452 sin6->sin6_port, 453 IN6_IS_ADDR_UNSPECIFIED(&in6p->in6p_laddr) ? in6a : &in6p->in6p_laddr, 454 in6p->in6p_lport, 0)) 455 return (EADDRINUSE); 456 if (IN6_IS_ADDR_UNSPECIFIED(&in6p->in6p_laddr) || 457 (IN6_IS_ADDR_V4MAPPED(&in6p->in6p_laddr) && 458 in6p->in6p_laddr.s6_addr32[3] == 0)) 459 { 460 if (in6p->in6p_lport == 0) { 461 (void)in6_pcbbind(in6p, (struct mbuf *)0, 462 (struct proc *)0); 463 } 464 in6p->in6p_laddr = *in6a; 465 } 466 in6p->in6p_faddr = sin6->sin6_addr; 467 in6p->in6p_fport = sin6->sin6_port; 468 in6_pcbstate(in6p, IN6P_CONNECTED); 469 in6p->in6p_flowinfo &= ~IPV6_FLOWLABEL_MASK; 470 if (ip6_auto_flowlabel) 471 in6p->in6p_flowinfo |= 472 (htonl(ip6_randomflowlabel()) & IPV6_FLOWLABEL_MASK); 473 #if defined(IPSEC) || defined(FAST_IPSEC) 474 if (in6p->in6p_socket->so_type == SOCK_STREAM) 475 ipsec_pcbconn(in6p->in6p_sp); 476 #endif 477 return (0); 478 } 479 480 void 481 in6_pcbdisconnect(in6p) 482 struct in6pcb *in6p; 483 { 484 bzero((caddr_t)&in6p->in6p_faddr, sizeof(in6p->in6p_faddr)); 485 in6p->in6p_fport = 0; 486 in6_pcbstate(in6p, IN6P_BOUND); 487 in6p->in6p_flowinfo &= ~IPV6_FLOWLABEL_MASK; 488 #if defined(IPSEC) || defined(FAST_IPSEC) 489 ipsec_pcbdisconn(in6p->in6p_sp); 490 #endif 491 if (in6p->in6p_socket->so_state & SS_NOFDREF) 492 in6_pcbdetach(in6p); 493 } 494 495 void 496 in6_pcbdetach(in6p) 497 struct in6pcb *in6p; 498 { 499 struct socket *so = in6p->in6p_socket; 500 int s; 501 502 if (in6p->in6p_af != AF_INET6) 503 return; 504 505 #if defined(IPSEC) || defined(FAST_IPSEC) 506 ipsec6_delete_pcbpolicy(in6p); 507 #endif /* IPSEC */ 508 sotoin6pcb(so) = 0; 509 sofree(so); 510 if (in6p->in6p_options) 511 m_freem(in6p->in6p_options); 512 if (in6p->in6p_outputopts) { 513 if (in6p->in6p_outputopts->ip6po_rthdr && 514 in6p->in6p_outputopts->ip6po_route.ro_rt) 515 RTFREE(in6p->in6p_outputopts->ip6po_route.ro_rt); 516 if (in6p->in6p_outputopts->ip6po_m) 517 (void)m_free(in6p->in6p_outputopts->ip6po_m); 518 free(in6p->in6p_outputopts, M_IP6OPT); 519 } 520 if (in6p->in6p_route.ro_rt) 521 rtfree(in6p->in6p_route.ro_rt); 522 ip6_freemoptions(in6p->in6p_moptions); 523 s = splnet(); 524 in6_pcbstate(in6p, IN6P_ATTACHED); 525 LIST_REMOVE(&in6p->in6p_head, inph_lhash); 526 CIRCLEQ_REMOVE(&in6p->in6p_table->inpt_queue, &in6p->in6p_head, 527 inph_queue); 528 splx(s); 529 pool_put(&in6pcb_pool, in6p); 530 } 531 532 void 533 in6_setsockaddr(in6p, nam) 534 struct in6pcb *in6p; 535 struct mbuf *nam; 536 { 537 struct sockaddr_in6 *sin6; 538 539 if (in6p->in6p_af != AF_INET6) 540 return; 541 542 nam->m_len = sizeof(*sin6); 543 sin6 = mtod(nam, struct sockaddr_in6 *); 544 bzero((caddr_t)sin6, sizeof(*sin6)); 545 sin6->sin6_family = AF_INET6; 546 sin6->sin6_len = sizeof(struct sockaddr_in6); 547 sin6->sin6_port = in6p->in6p_lport; 548 /* KAME hack: recover scopeid */ 549 (void)in6_recoverscope(sin6, &in6p->in6p_laddr, NULL); 550 } 551 552 void 553 in6_setpeeraddr(in6p, nam) 554 struct in6pcb *in6p; 555 struct mbuf *nam; 556 { 557 struct sockaddr_in6 *sin6; 558 559 if (in6p->in6p_af != AF_INET6) 560 return; 561 562 nam->m_len = sizeof(*sin6); 563 sin6 = mtod(nam, struct sockaddr_in6 *); 564 bzero((caddr_t)sin6, sizeof(*sin6)); 565 sin6->sin6_family = AF_INET6; 566 sin6->sin6_len = sizeof(struct sockaddr_in6); 567 sin6->sin6_port = in6p->in6p_fport; 568 /* KAME hack: recover scopeid */ 569 (void)in6_recoverscope(sin6, &in6p->in6p_faddr, NULL); 570 } 571 572 /* 573 * Pass some notification to all connections of a protocol 574 * associated with address dst. The local address and/or port numbers 575 * may be specified to limit the search. The "usual action" will be 576 * taken, depending on the ctlinput cmd. The caller must filter any 577 * cmds that are uninteresting (e.g., no error in the map). 578 * Call the protocol specific routine (if any) to report 579 * any errors for each matching socket. 580 * 581 * Must be called at splsoftnet. 582 * 583 * Note: src (4th arg) carries the flowlabel value on the original IPv6 584 * header, in sin6_flowinfo member. 585 */ 586 int 587 in6_pcbnotify(table, dst, fport_arg, src, lport_arg, cmd, cmdarg, notify) 588 struct inpcbtable *table; 589 struct sockaddr *dst, *src; 590 u_int fport_arg, lport_arg; 591 int cmd; 592 void *cmdarg; 593 void (*notify) __P((struct in6pcb *, int)); 594 { 595 struct in6pcb *in6p, *nin6p; 596 struct sockaddr_in6 sa6_src, *sa6_dst; 597 u_int16_t fport = fport_arg, lport = lport_arg; 598 int errno; 599 int nmatch = 0; 600 u_int32_t flowinfo; 601 602 if ((unsigned)cmd >= PRC_NCMDS || dst->sa_family != AF_INET6) 603 return 0; 604 605 sa6_dst = (struct sockaddr_in6 *)dst; 606 if (IN6_IS_ADDR_UNSPECIFIED(&sa6_dst->sin6_addr)) 607 return 0; 608 609 /* 610 * note that src can be NULL when we get notify by local fragmentation. 611 */ 612 sa6_src = (src == NULL) ? sa6_any : *(struct sockaddr_in6 *)src; 613 flowinfo = sa6_src.sin6_flowinfo; 614 615 /* 616 * Redirects go to all references to the destination, 617 * and use in6_rtchange to invalidate the route cache. 618 * Dead host indications: also use in6_rtchange to invalidate 619 * the cache, and deliver the error to all the sockets. 620 * Otherwise, if we have knowledge of the local port and address, 621 * deliver only to that socket. 622 */ 623 if (PRC_IS_REDIRECT(cmd) || cmd == PRC_HOSTDEAD) { 624 fport = 0; 625 lport = 0; 626 bzero((caddr_t)&sa6_src.sin6_addr, sizeof(sa6_src.sin6_addr)); 627 628 if (cmd != PRC_HOSTDEAD) 629 notify = in6_rtchange; 630 } 631 632 errno = inet6ctlerrmap[cmd]; 633 for (in6p = (struct in6pcb *)CIRCLEQ_FIRST(&table->inpt_queue); 634 in6p != (void *)&table->inpt_queue; 635 in6p = nin6p) { 636 nin6p = (struct in6pcb *)CIRCLEQ_NEXT(in6p, in6p_queue); 637 638 if (in6p->in6p_af != AF_INET6) 639 continue; 640 641 /* 642 * Under the following condition, notify of redirects 643 * to the pcb, without making address matches against inpcb. 644 * - redirect notification is arrived. 645 * - the inpcb is unconnected. 646 * - the inpcb is caching !RTF_HOST routing entry. 647 * - the ICMPv6 notification is from the gateway cached in the 648 * inpcb. i.e. ICMPv6 notification is from nexthop gateway 649 * the inpcb used very recently. 650 * 651 * This is to improve interaction between netbsd/openbsd 652 * redirect handling code, and inpcb route cache code. 653 * without the clause, !RTF_HOST routing entry (which carries 654 * gateway used by inpcb right before the ICMPv6 redirect) 655 * will be cached forever in unconnected inpcb. 656 * 657 * There still is a question regarding to what is TRT: 658 * - On bsdi/freebsd, RTF_HOST (cloned) routing entry will be 659 * generated on packet output. inpcb will always cache 660 * RTF_HOST routing entry so there's no need for the clause 661 * (ICMPv6 redirect will update RTF_HOST routing entry, 662 * and inpcb is caching it already). 663 * However, bsdi/freebsd are vulnerable to local DoS attacks 664 * due to the cloned routing entries. 665 * - Specwise, "destination cache" is mentioned in RFC2461. 666 * Jinmei says that it implies bsdi/freebsd behavior, itojun 667 * is not really convinced. 668 * - Having hiwat/lowat on # of cloned host route (redirect/ 669 * pmtud) may be a good idea. netbsd/openbsd has it. see 670 * icmp6_mtudisc_update(). 671 */ 672 if ((PRC_IS_REDIRECT(cmd) || cmd == PRC_HOSTDEAD) && 673 IN6_IS_ADDR_UNSPECIFIED(&in6p->in6p_laddr) && 674 in6p->in6p_route.ro_rt && 675 !(in6p->in6p_route.ro_rt->rt_flags & RTF_HOST)) { 676 struct sockaddr_in6 *dst6; 677 678 dst6 = (struct sockaddr_in6 *)&in6p->in6p_route.ro_dst; 679 if (IN6_ARE_ADDR_EQUAL(&dst6->sin6_addr, 680 &sa6_dst->sin6_addr)) 681 goto do_notify; 682 } 683 684 /* 685 * Detect if we should notify the error. If no source and 686 * destination ports are specified, but non-zero flowinfo and 687 * local address match, notify the error. This is the case 688 * when the error is delivered with an encrypted buffer 689 * by ESP. Otherwise, just compare addresses and ports 690 * as usual. 691 */ 692 if (lport == 0 && fport == 0 && flowinfo && 693 in6p->in6p_socket != NULL && 694 flowinfo == (in6p->in6p_flowinfo & IPV6_FLOWLABEL_MASK) && 695 IN6_ARE_ADDR_EQUAL(&in6p->in6p_laddr, &sa6_src.sin6_addr)) 696 goto do_notify; 697 else if (!IN6_ARE_ADDR_EQUAL(&in6p->in6p_faddr, 698 &sa6_dst->sin6_addr) || 699 in6p->in6p_socket == 0 || 700 (lport && in6p->in6p_lport != lport) || 701 (!IN6_IS_ADDR_UNSPECIFIED(&sa6_src.sin6_addr) && 702 !IN6_ARE_ADDR_EQUAL(&in6p->in6p_laddr, 703 &sa6_src.sin6_addr)) || 704 (fport && in6p->in6p_fport != fport)) 705 continue; 706 707 do_notify: 708 if (notify) 709 (*notify)(in6p, errno); 710 nmatch++; 711 } 712 return nmatch; 713 } 714 715 void 716 in6_pcbpurgeif0(table, ifp) 717 struct inpcbtable *table; 718 struct ifnet *ifp; 719 { 720 struct in6pcb *in6p, *nin6p; 721 struct ip6_moptions *im6o; 722 struct in6_multi_mship *imm, *nimm; 723 724 for (in6p = (struct in6pcb *)CIRCLEQ_FIRST(&table->inpt_queue); 725 in6p != (void *)&table->inpt_queue; 726 in6p = nin6p) { 727 nin6p = (struct in6pcb *)CIRCLEQ_NEXT(in6p, in6p_queue); 728 if (in6p->in6p_af != AF_INET6) 729 continue; 730 731 im6o = in6p->in6p_moptions; 732 if (im6o) { 733 /* 734 * Unselect the outgoing interface if it is being 735 * detached. 736 */ 737 if (im6o->im6o_multicast_ifp == ifp) 738 im6o->im6o_multicast_ifp = NULL; 739 740 /* 741 * Drop multicast group membership if we joined 742 * through the interface being detached. 743 * XXX controversial - is it really legal for kernel 744 * to force this? 745 */ 746 for (imm = im6o->im6o_memberships.lh_first; 747 imm != NULL; imm = nimm) { 748 nimm = imm->i6mm_chain.le_next; 749 if (imm->i6mm_maddr->in6m_ifp == ifp) { 750 LIST_REMOVE(imm, i6mm_chain); 751 in6_leavegroup(imm); 752 } 753 } 754 } 755 } 756 } 757 758 void 759 in6_pcbpurgeif(table, ifp) 760 struct inpcbtable *table; 761 struct ifnet *ifp; 762 { 763 struct in6pcb *in6p, *nin6p; 764 765 for (in6p = (struct in6pcb *)CIRCLEQ_FIRST(&table->inpt_queue); 766 in6p != (void *)&table->inpt_queue; 767 in6p = nin6p) { 768 nin6p = (struct in6pcb *)CIRCLEQ_NEXT(in6p, in6p_queue); 769 if (in6p->in6p_af != AF_INET6) 770 continue; 771 if (in6p->in6p_route.ro_rt != NULL && 772 in6p->in6p_route.ro_rt->rt_ifp == ifp) 773 in6_rtchange(in6p, 0); 774 } 775 } 776 777 /* 778 * Check for alternatives when higher level complains 779 * about service problems. For now, invalidate cached 780 * routing information. If the route was created dynamically 781 * (by a redirect), time to try a default gateway again. 782 */ 783 void 784 in6_losing(in6p) 785 struct in6pcb *in6p; 786 { 787 struct rtentry *rt; 788 struct rt_addrinfo info; 789 790 if (in6p->in6p_af != AF_INET6) 791 return; 792 793 if ((rt = in6p->in6p_route.ro_rt) != NULL) { 794 in6p->in6p_route.ro_rt = 0; 795 bzero((caddr_t)&info, sizeof(info)); 796 info.rti_info[RTAX_DST] = 797 (struct sockaddr *)&in6p->in6p_route.ro_dst; 798 info.rti_info[RTAX_GATEWAY] = rt->rt_gateway; 799 info.rti_info[RTAX_NETMASK] = rt_mask(rt); 800 rt_missmsg(RTM_LOSING, &info, rt->rt_flags, 0); 801 if (rt->rt_flags & RTF_DYNAMIC) { 802 (void)rtrequest(RTM_DELETE, rt_key(rt), 803 rt->rt_gateway, rt_mask(rt), rt->rt_flags, 804 (struct rtentry **)0); 805 } else { 806 /* 807 * A new route can be allocated 808 * the next time output is attempted. 809 */ 810 rtfree(rt); 811 } 812 } 813 } 814 815 /* 816 * After a routing change, flush old routing 817 * and allocate a (hopefully) better one. 818 */ 819 void 820 in6_rtchange(in6p, errno) 821 struct in6pcb *in6p; 822 int errno; 823 { 824 if (in6p->in6p_af != AF_INET6) 825 return; 826 827 if (in6p->in6p_route.ro_rt) { 828 rtfree(in6p->in6p_route.ro_rt); 829 in6p->in6p_route.ro_rt = 0; 830 /* 831 * A new route can be allocated the next time 832 * output is attempted. 833 */ 834 } 835 } 836 837 struct in6pcb * 838 in6_pcblookup_port(table, laddr6, lport_arg, lookup_wildcard) 839 struct inpcbtable *table; 840 struct in6_addr *laddr6; 841 u_int lport_arg; 842 int lookup_wildcard; 843 { 844 struct inpcbhead *head; 845 struct inpcb_hdr *inph; 846 struct in6pcb *in6p, *match = 0; 847 int matchwild = 3, wildcard; 848 u_int16_t lport = lport_arg; 849 850 head = IN6PCBHASH_PORT(table, lport); 851 LIST_FOREACH(inph, head, inph_lhash) { 852 in6p = (struct in6pcb *)inph; 853 if (in6p->in6p_af != AF_INET6) 854 continue; 855 856 if (in6p->in6p_lport != lport) 857 continue; 858 wildcard = 0; 859 if (IN6_IS_ADDR_V4MAPPED(&in6p->in6p_faddr)) { 860 if ((in6p->in6p_flags & IN6P_IPV6_V6ONLY) != 0) 861 continue; 862 } 863 if (!IN6_IS_ADDR_UNSPECIFIED(&in6p->in6p_faddr)) 864 wildcard++; 865 if (IN6_IS_ADDR_V4MAPPED(&in6p->in6p_laddr)) { 866 if ((in6p->in6p_flags & IN6P_IPV6_V6ONLY) != 0) 867 continue; 868 if (!IN6_IS_ADDR_V4MAPPED(laddr6)) 869 continue; 870 871 /* duplicate of IPv4 logic */ 872 wildcard = 0; 873 if (IN6_IS_ADDR_V4MAPPED(&in6p->in6p_faddr) && 874 in6p->in6p_faddr.s6_addr32[3]) 875 wildcard++; 876 if (!in6p->in6p_laddr.s6_addr32[3]) { 877 if (laddr6->s6_addr32[3]) 878 wildcard++; 879 } else { 880 if (!laddr6->s6_addr32[3]) 881 wildcard++; 882 else { 883 if (in6p->in6p_laddr.s6_addr32[3] != 884 laddr6->s6_addr32[3]) 885 continue; 886 } 887 } 888 } else if (IN6_IS_ADDR_UNSPECIFIED(&in6p->in6p_laddr)) { 889 if (IN6_IS_ADDR_V4MAPPED(laddr6)) { 890 if ((in6p->in6p_flags & IN6P_IPV6_V6ONLY) != 0) 891 continue; 892 } 893 if (!IN6_IS_ADDR_UNSPECIFIED(laddr6)) 894 wildcard++; 895 } else { 896 if (IN6_IS_ADDR_V4MAPPED(laddr6)) { 897 if ((in6p->in6p_flags & IN6P_IPV6_V6ONLY) != 0) 898 continue; 899 } 900 if (IN6_IS_ADDR_UNSPECIFIED(laddr6)) 901 wildcard++; 902 else { 903 if (!IN6_ARE_ADDR_EQUAL(&in6p->in6p_laddr, 904 laddr6)) 905 continue; 906 } 907 } 908 if (wildcard && !lookup_wildcard) 909 continue; 910 if (wildcard < matchwild) { 911 match = in6p; 912 matchwild = wildcard; 913 if (matchwild == 0) 914 break; 915 } 916 } 917 return (match); 918 } 919 #undef continue 920 921 /* 922 * WARNING: return value (rtentry) could be IPv4 one if in6pcb is connected to 923 * IPv4 mapped address. 924 */ 925 struct rtentry * 926 in6_pcbrtentry(in6p) 927 struct in6pcb *in6p; 928 { 929 struct route_in6 *ro; 930 struct sockaddr_in6 *dst6; 931 932 ro = &in6p->in6p_route; 933 dst6 = (struct sockaddr_in6 *)&ro->ro_dst; 934 935 if (in6p->in6p_af != AF_INET6) 936 return (NULL); 937 938 if (ro->ro_rt && ((ro->ro_rt->rt_flags & RTF_UP) == 0 || 939 !IN6_ARE_ADDR_EQUAL(&dst6->sin6_addr, &in6p->in6p_faddr))) { 940 RTFREE(ro->ro_rt); 941 ro->ro_rt = (struct rtentry *)NULL; 942 } 943 #ifdef INET 944 if (ro->ro_rt == (struct rtentry *)NULL && 945 IN6_IS_ADDR_V4MAPPED(&in6p->in6p_faddr)) { 946 struct sockaddr_in *dst = (struct sockaddr_in *)&ro->ro_dst; 947 948 bzero(dst, sizeof(*dst)); 949 dst->sin_family = AF_INET; 950 dst->sin_len = sizeof(struct sockaddr_in); 951 bcopy(&in6p->in6p_faddr.s6_addr32[3], &dst->sin_addr, 952 sizeof(dst->sin_addr)); 953 rtalloc((struct route *)ro); 954 } else 955 #endif 956 if (ro->ro_rt == (struct rtentry *)NULL && 957 !IN6_IS_ADDR_UNSPECIFIED(&in6p->in6p_faddr)) { 958 bzero(dst6, sizeof(*dst6)); 959 dst6->sin6_family = AF_INET6; 960 dst6->sin6_len = sizeof(struct sockaddr_in6); 961 dst6->sin6_addr = in6p->in6p_faddr; 962 rtalloc((struct route *)ro); 963 } 964 return (ro->ro_rt); 965 } 966 967 struct in6pcb * 968 in6_pcblookup_connect(table, faddr6, fport_arg, laddr6, lport_arg, faith) 969 struct inpcbtable *table; 970 struct in6_addr *faddr6, *laddr6; 971 u_int fport_arg, lport_arg; 972 int faith; 973 { 974 struct inpcbhead *head; 975 struct inpcb_hdr *inph; 976 struct in6pcb *in6p; 977 u_int16_t fport = fport_arg, lport = lport_arg; 978 979 head = IN6PCBHASH_CONNECT(table, faddr6, fport, laddr6, lport); 980 LIST_FOREACH(inph, head, inph_hash) { 981 in6p = (struct in6pcb *)inph; 982 if (in6p->in6p_af != AF_INET6) 983 continue; 984 985 /* find exact match on both source and dest */ 986 if (in6p->in6p_fport != fport) 987 continue; 988 if (in6p->in6p_lport != lport) 989 continue; 990 if (IN6_IS_ADDR_UNSPECIFIED(&in6p->in6p_faddr)) 991 continue; 992 if (!IN6_ARE_ADDR_EQUAL(&in6p->in6p_faddr, faddr6)) 993 continue; 994 if (IN6_IS_ADDR_UNSPECIFIED(&in6p->in6p_laddr)) 995 continue; 996 if (!IN6_ARE_ADDR_EQUAL(&in6p->in6p_laddr, laddr6)) 997 continue; 998 if ((IN6_IS_ADDR_V4MAPPED(laddr6) || 999 IN6_IS_ADDR_V4MAPPED(faddr6)) && 1000 (in6p->in6p_flags & IN6P_IPV6_V6ONLY)) 1001 continue; 1002 return in6p; 1003 } 1004 return NULL; 1005 } 1006 1007 struct in6pcb * 1008 in6_pcblookup_bind(table, laddr6, lport_arg, faith) 1009 struct inpcbtable *table; 1010 struct in6_addr *laddr6; 1011 u_int lport_arg; 1012 int faith; 1013 { 1014 struct inpcbhead *head; 1015 struct inpcb_hdr *inph; 1016 struct in6pcb *in6p; 1017 u_int16_t lport = lport_arg; 1018 #ifdef INET6 1019 struct in6_addr zero_mapped; 1020 #endif 1021 1022 head = IN6PCBHASH_BIND(table, laddr6, lport); 1023 LIST_FOREACH(inph, head, inph_hash) { 1024 in6p = (struct in6pcb *)inph; 1025 if (in6p->in6p_af != AF_INET6) 1026 continue; 1027 1028 if (faith && (in6p->in6p_flags & IN6P_FAITH) == 0) 1029 continue; 1030 if (in6p->in6p_fport != 0) 1031 continue; 1032 if (in6p->in6p_lport != lport) 1033 continue; 1034 if (IN6_IS_ADDR_V4MAPPED(laddr6) && 1035 (in6p->in6p_flags & IN6P_IPV6_V6ONLY) != 0) 1036 continue; 1037 if (IN6_ARE_ADDR_EQUAL(&in6p->in6p_laddr, laddr6)) 1038 goto out; 1039 } 1040 #ifdef INET 1041 if (IN6_IS_ADDR_V4MAPPED(laddr6)) { 1042 memset(&zero_mapped, 0, sizeof(zero_mapped)); 1043 zero_mapped.s6_addr16[5] = 0xffff; 1044 head = IN6PCBHASH_BIND(table, &zero_mapped, lport); 1045 LIST_FOREACH(inph, head, inph_hash) { 1046 in6p = (struct in6pcb *)inph; 1047 if (in6p->in6p_af != AF_INET6) 1048 continue; 1049 1050 if (faith && (in6p->in6p_flags & IN6P_FAITH) == 0) 1051 continue; 1052 if (in6p->in6p_fport != 0) 1053 continue; 1054 if (in6p->in6p_lport != lport) 1055 continue; 1056 if ((in6p->in6p_flags & IN6P_IPV6_V6ONLY) != 0) 1057 continue; 1058 if (IN6_ARE_ADDR_EQUAL(&in6p->in6p_laddr, &zero_mapped)) 1059 goto out; 1060 } 1061 } 1062 #endif 1063 head = IN6PCBHASH_BIND(table, &zeroin6_addr, lport); 1064 LIST_FOREACH(inph, head, inph_hash) { 1065 in6p = (struct in6pcb *)inph; 1066 if (in6p->in6p_af != AF_INET6) 1067 continue; 1068 1069 if (faith && (in6p->in6p_flags & IN6P_FAITH) == 0) 1070 continue; 1071 if (in6p->in6p_fport != 0) 1072 continue; 1073 if (in6p->in6p_lport != lport) 1074 continue; 1075 if (IN6_IS_ADDR_V4MAPPED(laddr6) && 1076 (in6p->in6p_flags & IN6P_IPV6_V6ONLY) != 0) 1077 continue; 1078 if (IN6_ARE_ADDR_EQUAL(&in6p->in6p_laddr, &zeroin6_addr)) 1079 goto out; 1080 } 1081 return (NULL); 1082 1083 out: 1084 inph = &in6p->in6p_head; 1085 if (inph != LIST_FIRST(head)) { 1086 LIST_REMOVE(inph, inph_hash); 1087 LIST_INSERT_HEAD(head, inph, inph_hash); 1088 } 1089 return in6p; 1090 } 1091 1092 void 1093 in6_pcbstate(in6p, state) 1094 struct in6pcb *in6p; 1095 int state; 1096 { 1097 1098 if (in6p->in6p_af != AF_INET6) 1099 return; 1100 1101 if (in6p->in6p_state > IN6P_ATTACHED) 1102 LIST_REMOVE(&in6p->in6p_head, inph_hash); 1103 1104 switch (state) { 1105 case IN6P_BOUND: 1106 LIST_INSERT_HEAD(IN6PCBHASH_BIND(in6p->in6p_table, 1107 &in6p->in6p_laddr, in6p->in6p_lport), &in6p->in6p_head, 1108 inph_hash); 1109 break; 1110 case IN6P_CONNECTED: 1111 LIST_INSERT_HEAD(IN6PCBHASH_CONNECT(in6p->in6p_table, 1112 &in6p->in6p_faddr, in6p->in6p_fport, 1113 &in6p->in6p_laddr, in6p->in6p_lport), &in6p->in6p_head, 1114 inph_hash); 1115 break; 1116 } 1117 1118 in6p->in6p_state = state; 1119 }
Cache object: befa4af4dfe93a95ee67e85201fb6cf8
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