in_pcb.c revision 1.149
1 /* $NetBSD: in_pcb.c,v 1.149 2014/07/24 15:12:03 rtr Exp $ */ 2 3 /* 4 * Copyright (C) 1995, 1996, 1997, and 1998 WIDE Project. 5 * All rights reserved. 6 * 7 * Redistribution and use in source and binary forms, with or without 8 * modification, are permitted provided that the following conditions 9 * are met: 10 * 1. Redistributions of source code must retain the above copyright 11 * notice, this list of conditions and the following disclaimer. 12 * 2. Redistributions in binary form must reproduce the above copyright 13 * notice, this list of conditions and the following disclaimer in the 14 * documentation and/or other materials provided with the distribution. 15 * 3. Neither the name of the project nor the names of its contributors 16 * may be used to endorse or promote products derived from this software 17 * without specific prior written permission. 18 * 19 * THIS SOFTWARE IS PROVIDED BY THE PROJECT AND CONTRIBUTORS ``AS IS'' AND 20 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 21 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 22 * ARE DISCLAIMED. IN NO EVENT SHALL THE PROJECT OR CONTRIBUTORS BE LIABLE 23 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 24 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 25 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 26 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 27 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 28 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 29 * SUCH DAMAGE. 30 */ 31 32 /*- 33 * Copyright (c) 1998, 2011 The NetBSD Foundation, Inc. 34 * All rights reserved. 35 * 36 * This code is derived from software contributed to The NetBSD Foundation 37 * by Coyote Point Systems, Inc. 38 * This code is derived from software contributed to The NetBSD Foundation 39 * by Public Access Networks Corporation ("Panix"). It was developed under 40 * contract to Panix by Eric Haszlakiewicz and Thor Lancelot Simon. 41 * 42 * Redistribution and use in source and binary forms, with or without 43 * modification, are permitted provided that the following conditions 44 * are met: 45 * 1. Redistributions of source code must retain the above copyright 46 * notice, this list of conditions and the following disclaimer. 47 * 2. Redistributions in binary form must reproduce the above copyright 48 * notice, this list of conditions and the following disclaimer in the 49 * documentation and/or other materials provided with the distribution. 50 * 51 * THIS SOFTWARE IS PROVIDED BY THE NETBSD FOUNDATION, INC. AND CONTRIBUTORS 52 * ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED 53 * TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR 54 * PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE FOUNDATION OR CONTRIBUTORS 55 * BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR 56 * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF 57 * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS 58 * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN 59 * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) 60 * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE 61 * POSSIBILITY OF SUCH DAMAGE. 62 */ 63 64 /* 65 * Copyright (c) 1982, 1986, 1991, 1993, 1995 66 * The Regents of the University of California. All rights reserved. 67 * 68 * Redistribution and use in source and binary forms, with or without 69 * modification, are permitted provided that the following conditions 70 * are met: 71 * 1. Redistributions of source code must retain the above copyright 72 * notice, this list of conditions and the following disclaimer. 73 * 2. Redistributions in binary form must reproduce the above copyright 74 * notice, this list of conditions and the following disclaimer in the 75 * documentation and/or other materials provided with the distribution. 76 * 3. Neither the name of the University nor the names of its contributors 77 * may be used to endorse or promote products derived from this software 78 * without specific prior written permission. 79 * 80 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND 81 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 82 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 83 * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE 84 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 85 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 86 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 87 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 88 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 89 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 90 * SUCH DAMAGE. 91 * 92 * @(#)in_pcb.c 8.4 (Berkeley) 5/24/95 93 */ 94 95 #include <sys/cdefs.h> 96 __KERNEL_RCSID(0, "$NetBSD: in_pcb.c,v 1.149 2014/07/24 15:12:03 rtr Exp $"); 97 98 #include "opt_inet.h" 99 #include "opt_ipsec.h" 100 101 #include <sys/param.h> 102 #include <sys/systm.h> 103 #include <sys/malloc.h> 104 #include <sys/mbuf.h> 105 #include <sys/protosw.h> 106 #include <sys/socket.h> 107 #include <sys/socketvar.h> 108 #include <sys/ioctl.h> 109 #include <sys/errno.h> 110 #include <sys/time.h> 111 #include <sys/once.h> 112 #include <sys/pool.h> 113 #include <sys/proc.h> 114 #include <sys/kauth.h> 115 #include <sys/uidinfo.h> 116 #include <sys/domain.h> 117 118 #include <net/if.h> 119 #include <net/route.h> 120 121 #include <netinet/in.h> 122 #include <netinet/in_systm.h> 123 #include <netinet/ip.h> 124 #include <netinet/in_pcb.h> 125 #include <netinet/in_var.h> 126 #include <netinet/ip_var.h> 127 #include <netinet/portalgo.h> 128 129 #ifdef INET6 130 #include <netinet/ip6.h> 131 #include <netinet6/ip6_var.h> 132 #include <netinet6/in6_pcb.h> 133 #endif 134 135 #ifdef IPSEC 136 #include <netipsec/ipsec.h> 137 #include <netipsec/key.h> 138 #endif /* IPSEC */ 139 140 #include <netinet/tcp_vtw.h> 141 142 struct in_addr zeroin_addr; 143 144 #define INPCBHASH_PORT(table, lport) \ 145 &(table)->inpt_porthashtbl[ntohs(lport) & (table)->inpt_porthash] 146 #define INPCBHASH_BIND(table, laddr, lport) \ 147 &(table)->inpt_bindhashtbl[ \ 148 ((ntohl((laddr).s_addr) + ntohs(lport))) & (table)->inpt_bindhash] 149 #define INPCBHASH_CONNECT(table, faddr, fport, laddr, lport) \ 150 &(table)->inpt_connecthashtbl[ \ 151 ((ntohl((faddr).s_addr) + ntohs(fport)) + \ 152 (ntohl((laddr).s_addr) + ntohs(lport))) & (table)->inpt_connecthash] 153 154 int anonportmin = IPPORT_ANONMIN; 155 int anonportmax = IPPORT_ANONMAX; 156 int lowportmin = IPPORT_RESERVEDMIN; 157 int lowportmax = IPPORT_RESERVEDMAX; 158 159 static struct pool inpcb_pool; 160 161 static int 162 inpcb_poolinit(void) 163 { 164 165 pool_init(&inpcb_pool, sizeof(struct inpcb), 0, 0, 0, "inpcbpl", NULL, 166 IPL_NET); 167 return 0; 168 } 169 170 void 171 in_pcbinit(struct inpcbtable *table, int bindhashsize, int connecthashsize) 172 { 173 static ONCE_DECL(control); 174 175 TAILQ_INIT(&table->inpt_queue); 176 table->inpt_porthashtbl = hashinit(bindhashsize, HASH_LIST, true, 177 &table->inpt_porthash); 178 table->inpt_bindhashtbl = hashinit(bindhashsize, HASH_LIST, true, 179 &table->inpt_bindhash); 180 table->inpt_connecthashtbl = hashinit(connecthashsize, HASH_LIST, true, 181 &table->inpt_connecthash); 182 table->inpt_lastlow = IPPORT_RESERVEDMAX; 183 table->inpt_lastport = (u_int16_t)anonportmax; 184 185 RUN_ONCE(&control, inpcb_poolinit); 186 } 187 188 int 189 in_pcballoc(struct socket *so, void *v) 190 { 191 struct inpcbtable *table = v; 192 struct inpcb *inp; 193 int s; 194 195 s = splnet(); 196 inp = pool_get(&inpcb_pool, PR_NOWAIT); 197 splx(s); 198 if (inp == NULL) 199 return (ENOBUFS); 200 memset(inp, 0, sizeof(*inp)); 201 inp->inp_af = AF_INET; 202 inp->inp_table = table; 203 inp->inp_socket = so; 204 inp->inp_errormtu = -1; 205 inp->inp_portalgo = PORTALGO_DEFAULT; 206 inp->inp_bindportonsend = false; 207 #if defined(IPSEC) 208 if (ipsec_enabled) { 209 int error = ipsec_init_pcbpolicy(so, &inp->inp_sp); 210 if (error != 0) { 211 s = splnet(); 212 pool_put(&inpcb_pool, inp); 213 splx(s); 214 return error; 215 } 216 } 217 #endif 218 so->so_pcb = inp; 219 s = splnet(); 220 TAILQ_INSERT_HEAD(&table->inpt_queue, &inp->inp_head, inph_queue); 221 LIST_INSERT_HEAD(INPCBHASH_PORT(table, inp->inp_lport), &inp->inp_head, 222 inph_lhash); 223 in_pcbstate(inp, INP_ATTACHED); 224 splx(s); 225 return (0); 226 } 227 228 static int 229 in_pcbsetport(struct sockaddr_in *sin, struct inpcb *inp, kauth_cred_t cred) 230 { 231 struct inpcbtable *table = inp->inp_table; 232 struct socket *so = inp->inp_socket; 233 u_int16_t *lastport; 234 u_int16_t lport = 0; 235 enum kauth_network_req req; 236 int error; 237 238 if (inp->inp_flags & INP_LOWPORT) { 239 #ifndef IPNOPRIVPORTS 240 req = KAUTH_REQ_NETWORK_BIND_PRIVPORT; 241 #else 242 req = KAUTH_REQ_NETWORK_BIND_PORT; 243 #endif 244 245 lastport = &table->inpt_lastlow; 246 } else { 247 req = KAUTH_REQ_NETWORK_BIND_PORT; 248 249 lastport = &table->inpt_lastport; 250 } 251 252 /* XXX-kauth: KAUTH_REQ_NETWORK_BIND_AUTOASSIGN_{,PRIV}PORT */ 253 error = kauth_authorize_network(cred, KAUTH_NETWORK_BIND, req, so, sin, 254 NULL); 255 if (error) 256 return (EACCES); 257 258 /* 259 * Use RFC6056 randomized port selection 260 */ 261 error = portalgo_randport(&lport, &inp->inp_head, cred); 262 if (error) 263 return error; 264 265 inp->inp_flags |= INP_ANONPORT; 266 *lastport = lport; 267 lport = htons(lport); 268 inp->inp_lport = lport; 269 in_pcbstate(inp, INP_BOUND); 270 271 return (0); 272 } 273 274 static int 275 in_pcbbind_addr(struct inpcb *inp, struct sockaddr_in *sin, kauth_cred_t cred) 276 { 277 if (sin->sin_family != AF_INET) 278 return (EAFNOSUPPORT); 279 280 if (IN_MULTICAST(sin->sin_addr.s_addr)) { 281 /* Always succeed; port reuse handled in in_pcbbind_port(). */ 282 } else if (!in_nullhost(sin->sin_addr)) { 283 struct in_ifaddr *ia = NULL; 284 285 INADDR_TO_IA(sin->sin_addr, ia); 286 /* check for broadcast addresses */ 287 if (ia == NULL) 288 ia = ifatoia(ifa_ifwithaddr(sintosa(sin))); 289 if (ia == NULL) 290 return (EADDRNOTAVAIL); 291 } 292 293 inp->inp_laddr = sin->sin_addr; 294 295 return (0); 296 } 297 298 static int 299 in_pcbbind_port(struct inpcb *inp, struct sockaddr_in *sin, kauth_cred_t cred) 300 { 301 struct inpcbtable *table = inp->inp_table; 302 struct socket *so = inp->inp_socket; 303 int reuseport = (so->so_options & SO_REUSEPORT); 304 int wild = 0, error; 305 306 if (IN_MULTICAST(sin->sin_addr.s_addr)) { 307 /* 308 * Treat SO_REUSEADDR as SO_REUSEPORT for multicast; 309 * allow complete duplication of binding if 310 * SO_REUSEPORT is set, or if SO_REUSEADDR is set 311 * and a multicast address is bound on both 312 * new and duplicated sockets. 313 */ 314 if (so->so_options & SO_REUSEADDR) 315 reuseport = SO_REUSEADDR|SO_REUSEPORT; 316 } 317 318 if (sin->sin_port == 0) { 319 error = in_pcbsetport(sin, inp, cred); 320 if (error) 321 return (error); 322 } else { 323 struct inpcb *t; 324 vestigial_inpcb_t vestige; 325 #ifdef INET6 326 struct in6pcb *t6; 327 struct in6_addr mapped; 328 #endif 329 enum kauth_network_req req; 330 331 if ((so->so_options & (SO_REUSEADDR|SO_REUSEPORT)) == 0) 332 wild = 1; 333 334 #ifndef IPNOPRIVPORTS 335 if (ntohs(sin->sin_port) < IPPORT_RESERVED) 336 req = KAUTH_REQ_NETWORK_BIND_PRIVPORT; 337 else 338 #endif /* !IPNOPRIVPORTS */ 339 req = KAUTH_REQ_NETWORK_BIND_PORT; 340 341 error = kauth_authorize_network(cred, KAUTH_NETWORK_BIND, req, 342 so, sin, NULL); 343 if (error) 344 return (EACCES); 345 346 #ifdef INET6 347 memset(&mapped, 0, sizeof(mapped)); 348 mapped.s6_addr16[5] = 0xffff; 349 memcpy(&mapped.s6_addr32[3], &sin->sin_addr, 350 sizeof(mapped.s6_addr32[3])); 351 t6 = in6_pcblookup_port(table, &mapped, sin->sin_port, wild, &vestige); 352 if (t6 && (reuseport & t6->in6p_socket->so_options) == 0) 353 return (EADDRINUSE); 354 if (!t6 && vestige.valid) { 355 if (!!reuseport != !!vestige.reuse_port) { 356 return EADDRINUSE; 357 } 358 } 359 #endif 360 361 /* XXX-kauth */ 362 if (so->so_uidinfo->ui_uid && !IN_MULTICAST(sin->sin_addr.s_addr)) { 363 t = in_pcblookup_port(table, sin->sin_addr, sin->sin_port, 1, &vestige); 364 /* 365 * XXX: investigate ramifications of loosening this 366 * restriction so that as long as both ports have 367 * SO_REUSEPORT allow the bind 368 */ 369 if (t && 370 (!in_nullhost(sin->sin_addr) || 371 !in_nullhost(t->inp_laddr) || 372 (t->inp_socket->so_options & SO_REUSEPORT) == 0) 373 && (so->so_uidinfo->ui_uid != t->inp_socket->so_uidinfo->ui_uid)) { 374 return (EADDRINUSE); 375 } 376 if (!t && vestige.valid) { 377 if ((!in_nullhost(sin->sin_addr) 378 || !in_nullhost(vestige.laddr.v4) 379 || !vestige.reuse_port) 380 && so->so_uidinfo->ui_uid != vestige.uid) { 381 return EADDRINUSE; 382 } 383 } 384 } 385 t = in_pcblookup_port(table, sin->sin_addr, sin->sin_port, wild, &vestige); 386 if (t && (reuseport & t->inp_socket->so_options) == 0) 387 return (EADDRINUSE); 388 if (!t 389 && vestige.valid 390 && !(reuseport && vestige.reuse_port)) 391 return EADDRINUSE; 392 393 inp->inp_lport = sin->sin_port; 394 in_pcbstate(inp, INP_BOUND); 395 } 396 397 LIST_REMOVE(&inp->inp_head, inph_lhash); 398 LIST_INSERT_HEAD(INPCBHASH_PORT(table, inp->inp_lport), &inp->inp_head, 399 inph_lhash); 400 401 return (0); 402 } 403 404 int 405 in_pcbbind(void *v, struct mbuf *nam) 406 { 407 struct inpcb *inp = v; 408 struct sockaddr_in *sin = NULL; /* XXXGCC */ 409 struct sockaddr_in lsin; 410 int error; 411 412 if (inp->inp_af != AF_INET) 413 return (EINVAL); 414 415 if (TAILQ_FIRST(&in_ifaddrhead) == 0) 416 return (EADDRNOTAVAIL); 417 if (inp->inp_lport || !in_nullhost(inp->inp_laddr)) 418 return (EINVAL); 419 420 if (nam != NULL) { 421 sin = mtod(nam, struct sockaddr_in *); 422 if (nam->m_len != sizeof (*sin)) 423 return (EINVAL); 424 } else { 425 lsin = *((const struct sockaddr_in *) 426 inp->inp_socket->so_proto->pr_domain->dom_sa_any); 427 sin = &lsin; 428 } 429 430 /* Bind address. */ 431 error = in_pcbbind_addr(inp, sin, curlwp->l_cred); 432 if (error) 433 return (error); 434 435 /* Bind port. */ 436 error = in_pcbbind_port(inp, sin, curlwp->l_cred); 437 if (error) { 438 inp->inp_laddr.s_addr = INADDR_ANY; 439 440 return (error); 441 } 442 443 return (0); 444 } 445 446 /* 447 * Connect from a socket to a specified address. 448 * Both address and port must be specified in argument sin. 449 * If don't have a local address for this socket yet, 450 * then pick one. 451 */ 452 int 453 in_pcbconnect(void *v, struct mbuf *nam, struct lwp *l) 454 { 455 struct inpcb *inp = v; 456 struct in_ifaddr *ia = NULL; 457 struct sockaddr_in *ifaddr = NULL; 458 struct sockaddr_in *sin = mtod(nam, struct sockaddr_in *); 459 vestigial_inpcb_t vestige; 460 int error; 461 462 if (inp->inp_af != AF_INET) 463 return (EINVAL); 464 465 if (nam->m_len != sizeof (*sin)) 466 return (EINVAL); 467 if (sin->sin_family != AF_INET) 468 return (EAFNOSUPPORT); 469 if (sin->sin_port == 0) 470 return (EADDRNOTAVAIL); 471 472 if (IN_MULTICAST(sin->sin_addr.s_addr) && 473 inp->inp_socket->so_type == SOCK_STREAM) 474 return EADDRNOTAVAIL; 475 476 if (TAILQ_FIRST(&in_ifaddrhead) != 0) { 477 /* 478 * If the destination address is INADDR_ANY, 479 * use any local address (likely loopback). 480 * If the supplied address is INADDR_BROADCAST, 481 * use the broadcast address of an interface 482 * which supports broadcast. (loopback does not) 483 */ 484 485 if (in_nullhost(sin->sin_addr)) { 486 sin->sin_addr = 487 TAILQ_FIRST(&in_ifaddrhead)->ia_addr.sin_addr; 488 } else if (sin->sin_addr.s_addr == INADDR_BROADCAST) { 489 TAILQ_FOREACH(ia, &in_ifaddrhead, ia_list) { 490 if (ia->ia_ifp->if_flags & IFF_BROADCAST) { 491 sin->sin_addr = 492 ia->ia_broadaddr.sin_addr; 493 break; 494 } 495 } 496 } 497 } 498 /* 499 * If we haven't bound which network number to use as ours, 500 * we will use the number of the outgoing interface. 501 * This depends on having done a routing lookup, which 502 * we will probably have to do anyway, so we might 503 * as well do it now. On the other hand if we are 504 * sending to multiple destinations we may have already 505 * done the lookup, so see if we can use the route 506 * from before. In any case, we only 507 * chose a port number once, even if sending to multiple 508 * destinations. 509 */ 510 if (in_nullhost(inp->inp_laddr)) { 511 int xerror; 512 ifaddr = in_selectsrc(sin, &inp->inp_route, 513 inp->inp_socket->so_options, inp->inp_moptions, &xerror); 514 if (ifaddr == NULL) { 515 if (xerror == 0) 516 xerror = EADDRNOTAVAIL; 517 return xerror; 518 } 519 INADDR_TO_IA(ifaddr->sin_addr, ia); 520 if (ia == NULL) 521 return (EADDRNOTAVAIL); 522 } 523 if (in_pcblookup_connect(inp->inp_table, sin->sin_addr, sin->sin_port, 524 !in_nullhost(inp->inp_laddr) ? inp->inp_laddr : ifaddr->sin_addr, 525 inp->inp_lport, &vestige) != 0 526 || vestige.valid) 527 return (EADDRINUSE); 528 if (in_nullhost(inp->inp_laddr)) { 529 if (inp->inp_lport == 0) { 530 error = in_pcbbind(inp, NULL); 531 /* 532 * This used to ignore the return value 533 * completely, but we need to check for 534 * ephemeral port shortage. 535 * And attempts to request low ports if not root. 536 */ 537 if (error != 0) 538 return (error); 539 } 540 inp->inp_laddr = ifaddr->sin_addr; 541 } 542 inp->inp_faddr = sin->sin_addr; 543 inp->inp_fport = sin->sin_port; 544 545 /* Late bind, if needed */ 546 if (inp->inp_bindportonsend) { 547 struct sockaddr_in lsin = *((const struct sockaddr_in *) 548 inp->inp_socket->so_proto->pr_domain->dom_sa_any); 549 lsin.sin_addr = inp->inp_laddr; 550 lsin.sin_port = 0; 551 552 if ((error = in_pcbbind_port(inp, &lsin, l->l_cred)) != 0) 553 return error; 554 } 555 556 in_pcbstate(inp, INP_CONNECTED); 557 #if defined(IPSEC) 558 if (ipsec_enabled && inp->inp_socket->so_type == SOCK_STREAM) 559 ipsec_pcbconn(inp->inp_sp); 560 #endif 561 return (0); 562 } 563 564 void 565 in_pcbdisconnect(void *v) 566 { 567 struct inpcb *inp = v; 568 569 if (inp->inp_af != AF_INET) 570 return; 571 572 inp->inp_faddr = zeroin_addr; 573 inp->inp_fport = 0; 574 in_pcbstate(inp, INP_BOUND); 575 #if defined(IPSEC) 576 if (ipsec_enabled) 577 ipsec_pcbdisconn(inp->inp_sp); 578 #endif 579 if (inp->inp_socket->so_state & SS_NOFDREF) 580 in_pcbdetach(inp); 581 } 582 583 void 584 in_pcbdetach(void *v) 585 { 586 struct inpcb *inp = v; 587 struct socket *so = inp->inp_socket; 588 int s; 589 590 if (inp->inp_af != AF_INET) 591 return; 592 593 #if defined(IPSEC) 594 if (ipsec_enabled) 595 ipsec4_delete_pcbpolicy(inp); 596 #endif /* IPSEC */ 597 so->so_pcb = 0; 598 if (inp->inp_options) 599 (void)m_free(inp->inp_options); 600 rtcache_free(&inp->inp_route); 601 ip_freemoptions(inp->inp_moptions); 602 s = splnet(); 603 in_pcbstate(inp, INP_ATTACHED); 604 LIST_REMOVE(&inp->inp_head, inph_lhash); 605 TAILQ_REMOVE(&inp->inp_table->inpt_queue, &inp->inp_head, inph_queue); 606 pool_put(&inpcb_pool, inp); 607 splx(s); 608 sofree(so); /* drops the socket's lock */ 609 mutex_enter(softnet_lock); /* reacquire the softnet_lock */ 610 } 611 612 void 613 in_setsockaddr(struct inpcb *inp, struct mbuf *nam) 614 { 615 struct sockaddr_in *sin; 616 617 if (inp->inp_af != AF_INET) 618 return; 619 620 sin = mtod(nam, struct sockaddr_in *); 621 sockaddr_in_init(sin, &inp->inp_laddr, inp->inp_lport); 622 nam->m_len = sin->sin_len; 623 } 624 625 void 626 in_setpeeraddr(struct inpcb *inp, struct mbuf *nam) 627 { 628 struct sockaddr_in *sin; 629 630 if (inp->inp_af != AF_INET) 631 return; 632 633 sin = mtod(nam, struct sockaddr_in *); 634 sockaddr_in_init(sin, &inp->inp_faddr, inp->inp_fport); 635 nam->m_len = sin->sin_len; 636 } 637 638 /* 639 * Pass some notification to all connections of a protocol 640 * associated with address dst. The local address and/or port numbers 641 * may be specified to limit the search. The "usual action" will be 642 * taken, depending on the ctlinput cmd. The caller must filter any 643 * cmds that are uninteresting (e.g., no error in the map). 644 * Call the protocol specific routine (if any) to report 645 * any errors for each matching socket. 646 * 647 * Must be called at splsoftnet. 648 */ 649 int 650 in_pcbnotify(struct inpcbtable *table, struct in_addr faddr, u_int fport_arg, 651 struct in_addr laddr, u_int lport_arg, int errno, 652 void (*notify)(struct inpcb *, int)) 653 { 654 struct inpcbhead *head; 655 struct inpcb *inp, *ninp; 656 u_int16_t fport = fport_arg, lport = lport_arg; 657 int nmatch; 658 659 if (in_nullhost(faddr) || notify == 0) 660 return (0); 661 662 nmatch = 0; 663 head = INPCBHASH_CONNECT(table, faddr, fport, laddr, lport); 664 for (inp = (struct inpcb *)LIST_FIRST(head); inp != NULL; inp = ninp) { 665 ninp = (struct inpcb *)LIST_NEXT(inp, inp_hash); 666 if (inp->inp_af != AF_INET) 667 continue; 668 if (in_hosteq(inp->inp_faddr, faddr) && 669 inp->inp_fport == fport && 670 inp->inp_lport == lport && 671 in_hosteq(inp->inp_laddr, laddr)) { 672 (*notify)(inp, errno); 673 nmatch++; 674 } 675 } 676 return (nmatch); 677 } 678 679 void 680 in_pcbnotifyall(struct inpcbtable *table, struct in_addr faddr, int errno, 681 void (*notify)(struct inpcb *, int)) 682 { 683 struct inpcb_hdr *inph, *ninph; 684 685 if (in_nullhost(faddr) || notify == 0) 686 return; 687 688 TAILQ_FOREACH_SAFE(inph, &table->inpt_queue, inph_queue, ninph) { 689 struct inpcb *inp = (struct inpcb *)inph; 690 if (inp->inp_af != AF_INET) 691 continue; 692 if (in_hosteq(inp->inp_faddr, faddr)) 693 (*notify)(inp, errno); 694 } 695 } 696 697 void 698 in_pcbpurgeif0(struct inpcbtable *table, struct ifnet *ifp) 699 { 700 struct inpcb_hdr *inph, *ninph; 701 struct ip_moptions *imo; 702 int i, gap; 703 704 TAILQ_FOREACH_SAFE(inph, &table->inpt_queue, inph_queue, ninph) { 705 struct inpcb *inp = (struct inpcb *)inph; 706 if (inp->inp_af != AF_INET) 707 continue; 708 imo = inp->inp_moptions; 709 if (imo != NULL) { 710 /* 711 * Unselect the outgoing interface if it is being 712 * detached. 713 */ 714 if (imo->imo_multicast_ifp == ifp) 715 imo->imo_multicast_ifp = NULL; 716 717 /* 718 * Drop multicast group membership if we joined 719 * through the interface being detached. 720 */ 721 for (i = 0, gap = 0; i < imo->imo_num_memberships; 722 i++) { 723 if (imo->imo_membership[i]->inm_ifp == ifp) { 724 in_delmulti(imo->imo_membership[i]); 725 gap++; 726 } else if (gap != 0) 727 imo->imo_membership[i - gap] = 728 imo->imo_membership[i]; 729 } 730 imo->imo_num_memberships -= gap; 731 } 732 } 733 } 734 735 void 736 in_pcbpurgeif(struct inpcbtable *table, struct ifnet *ifp) 737 { 738 struct rtentry *rt; 739 struct inpcb_hdr *inph, *ninph; 740 741 TAILQ_FOREACH_SAFE(inph, &table->inpt_queue, inph_queue, ninph) { 742 struct inpcb *inp = (struct inpcb *)inph; 743 if (inp->inp_af != AF_INET) 744 continue; 745 if ((rt = rtcache_validate(&inp->inp_route)) != NULL && 746 rt->rt_ifp == ifp) 747 in_rtchange(inp, 0); 748 } 749 } 750 751 /* 752 * Check for alternatives when higher level complains 753 * about service problems. For now, invalidate cached 754 * routing information. If the route was created dynamically 755 * (by a redirect), time to try a default gateway again. 756 */ 757 void 758 in_losing(struct inpcb *inp) 759 { 760 struct rtentry *rt; 761 struct rt_addrinfo info; 762 763 if (inp->inp_af != AF_INET) 764 return; 765 766 if ((rt = rtcache_validate(&inp->inp_route)) == NULL) 767 return; 768 769 memset(&info, 0, sizeof(info)); 770 info.rti_info[RTAX_DST] = rtcache_getdst(&inp->inp_route); 771 info.rti_info[RTAX_GATEWAY] = rt->rt_gateway; 772 info.rti_info[RTAX_NETMASK] = rt_mask(rt); 773 rt_missmsg(RTM_LOSING, &info, rt->rt_flags, 0); 774 if (rt->rt_flags & RTF_DYNAMIC) 775 (void) rtrequest(RTM_DELETE, rt_getkey(rt), 776 rt->rt_gateway, rt_mask(rt), rt->rt_flags, 777 NULL); 778 /* 779 * A new route can be allocated 780 * the next time output is attempted. 781 */ 782 rtcache_free(&inp->inp_route); 783 } 784 785 /* 786 * After a routing change, flush old routing. A new route can be 787 * allocated the next time output is attempted. 788 */ 789 void 790 in_rtchange(struct inpcb *inp, int errno) 791 { 792 793 if (inp->inp_af != AF_INET) 794 return; 795 796 rtcache_free(&inp->inp_route); 797 798 /* XXX SHOULD NOTIFY HIGHER-LEVEL PROTOCOLS */ 799 } 800 801 struct inpcb * 802 in_pcblookup_port(struct inpcbtable *table, struct in_addr laddr, 803 u_int lport_arg, int lookup_wildcard, vestigial_inpcb_t *vp) 804 { 805 struct inpcbhead *head; 806 struct inpcb_hdr *inph; 807 struct inpcb *match = NULL; 808 int matchwild = 3; 809 int wildcard; 810 u_int16_t lport = lport_arg; 811 812 if (vp) 813 vp->valid = 0; 814 815 head = INPCBHASH_PORT(table, lport); 816 LIST_FOREACH(inph, head, inph_lhash) { 817 struct inpcb * const inp = (struct inpcb *)inph; 818 819 if (inp->inp_af != AF_INET) 820 continue; 821 if (inp->inp_lport != lport) 822 continue; 823 /* 824 * check if inp's faddr and laddr match with ours. 825 * our faddr is considered null. 826 * count the number of wildcard matches. (0 - 2) 827 * 828 * null null match 829 * A null wildcard match 830 * null B wildcard match 831 * A B non match 832 * A A match 833 */ 834 wildcard = 0; 835 if (!in_nullhost(inp->inp_faddr)) 836 wildcard++; 837 if (in_nullhost(inp->inp_laddr)) { 838 if (!in_nullhost(laddr)) 839 wildcard++; 840 } else { 841 if (in_nullhost(laddr)) 842 wildcard++; 843 else { 844 if (!in_hosteq(inp->inp_laddr, laddr)) 845 continue; 846 } 847 } 848 if (wildcard && !lookup_wildcard) 849 continue; 850 /* 851 * prefer an address with less wildcards. 852 */ 853 if (wildcard < matchwild) { 854 match = inp; 855 matchwild = wildcard; 856 if (matchwild == 0) 857 break; 858 } 859 } 860 if (match && matchwild == 0) 861 return match; 862 863 if (vp && table->vestige) { 864 void *state = (*table->vestige->init_ports4)(laddr, lport_arg, lookup_wildcard); 865 vestigial_inpcb_t better; 866 867 while (table->vestige 868 && (*table->vestige->next_port4)(state, vp)) { 869 870 if (vp->lport != lport) 871 continue; 872 wildcard = 0; 873 if (!in_nullhost(vp->faddr.v4)) 874 wildcard++; 875 if (in_nullhost(vp->laddr.v4)) { 876 if (!in_nullhost(laddr)) 877 wildcard++; 878 } else { 879 if (in_nullhost(laddr)) 880 wildcard++; 881 else { 882 if (!in_hosteq(vp->laddr.v4, laddr)) 883 continue; 884 } 885 } 886 if (wildcard && !lookup_wildcard) 887 continue; 888 if (wildcard < matchwild) { 889 better = *vp; 890 match = (void*)&better; 891 892 matchwild = wildcard; 893 if (matchwild == 0) 894 break; 895 } 896 } 897 898 if (match) { 899 if (match != (void*)&better) 900 return match; 901 else { 902 *vp = better; 903 return 0; 904 } 905 } 906 } 907 908 return (match); 909 } 910 911 #ifdef DIAGNOSTIC 912 int in_pcbnotifymiss = 0; 913 #endif 914 915 struct inpcb * 916 in_pcblookup_connect(struct inpcbtable *table, 917 struct in_addr faddr, u_int fport_arg, 918 struct in_addr laddr, u_int lport_arg, 919 vestigial_inpcb_t *vp) 920 { 921 struct inpcbhead *head; 922 struct inpcb_hdr *inph; 923 struct inpcb *inp; 924 u_int16_t fport = fport_arg, lport = lport_arg; 925 926 if (vp) 927 vp->valid = 0; 928 929 head = INPCBHASH_CONNECT(table, faddr, fport, laddr, lport); 930 LIST_FOREACH(inph, head, inph_hash) { 931 inp = (struct inpcb *)inph; 932 if (inp->inp_af != AF_INET) 933 continue; 934 935 if (in_hosteq(inp->inp_faddr, faddr) && 936 inp->inp_fport == fport && 937 inp->inp_lport == lport && 938 in_hosteq(inp->inp_laddr, laddr)) 939 goto out; 940 } 941 if (vp && table->vestige) { 942 if ((*table->vestige->lookup4)(faddr, fport_arg, 943 laddr, lport_arg, vp)) 944 return 0; 945 } 946 947 #ifdef DIAGNOSTIC 948 if (in_pcbnotifymiss) { 949 printf("in_pcblookup_connect: faddr=%08x fport=%d laddr=%08x lport=%d\n", 950 ntohl(faddr.s_addr), ntohs(fport), 951 ntohl(laddr.s_addr), ntohs(lport)); 952 } 953 #endif 954 return (0); 955 956 out: 957 /* Move this PCB to the head of hash chain. */ 958 inph = &inp->inp_head; 959 if (inph != LIST_FIRST(head)) { 960 LIST_REMOVE(inph, inph_hash); 961 LIST_INSERT_HEAD(head, inph, inph_hash); 962 } 963 return (inp); 964 } 965 966 struct inpcb * 967 in_pcblookup_bind(struct inpcbtable *table, 968 struct in_addr laddr, u_int lport_arg) 969 { 970 struct inpcbhead *head; 971 struct inpcb_hdr *inph; 972 struct inpcb *inp; 973 u_int16_t lport = lport_arg; 974 975 head = INPCBHASH_BIND(table, laddr, lport); 976 LIST_FOREACH(inph, head, inph_hash) { 977 inp = (struct inpcb *)inph; 978 if (inp->inp_af != AF_INET) 979 continue; 980 981 if (inp->inp_lport == lport && 982 in_hosteq(inp->inp_laddr, laddr)) 983 goto out; 984 } 985 head = INPCBHASH_BIND(table, zeroin_addr, lport); 986 LIST_FOREACH(inph, head, inph_hash) { 987 inp = (struct inpcb *)inph; 988 if (inp->inp_af != AF_INET) 989 continue; 990 991 if (inp->inp_lport == lport && 992 in_hosteq(inp->inp_laddr, zeroin_addr)) 993 goto out; 994 } 995 #ifdef DIAGNOSTIC 996 if (in_pcbnotifymiss) { 997 printf("in_pcblookup_bind: laddr=%08x lport=%d\n", 998 ntohl(laddr.s_addr), ntohs(lport)); 999 } 1000 #endif 1001 return (0); 1002 1003 out: 1004 /* Move this PCB to the head of hash chain. */ 1005 inph = &inp->inp_head; 1006 if (inph != LIST_FIRST(head)) { 1007 LIST_REMOVE(inph, inph_hash); 1008 LIST_INSERT_HEAD(head, inph, inph_hash); 1009 } 1010 return (inp); 1011 } 1012 1013 void 1014 in_pcbstate(struct inpcb *inp, int state) 1015 { 1016 1017 if (inp->inp_af != AF_INET) 1018 return; 1019 1020 if (inp->inp_state > INP_ATTACHED) 1021 LIST_REMOVE(&inp->inp_head, inph_hash); 1022 1023 switch (state) { 1024 case INP_BOUND: 1025 LIST_INSERT_HEAD(INPCBHASH_BIND(inp->inp_table, 1026 inp->inp_laddr, inp->inp_lport), &inp->inp_head, 1027 inph_hash); 1028 break; 1029 case INP_CONNECTED: 1030 LIST_INSERT_HEAD(INPCBHASH_CONNECT(inp->inp_table, 1031 inp->inp_faddr, inp->inp_fport, 1032 inp->inp_laddr, inp->inp_lport), &inp->inp_head, 1033 inph_hash); 1034 break; 1035 } 1036 1037 inp->inp_state = state; 1038 } 1039 1040 struct rtentry * 1041 in_pcbrtentry(struct inpcb *inp) 1042 { 1043 struct route *ro; 1044 union { 1045 struct sockaddr dst; 1046 struct sockaddr_in dst4; 1047 } u; 1048 1049 if (inp->inp_af != AF_INET) 1050 return (NULL); 1051 1052 ro = &inp->inp_route; 1053 1054 sockaddr_in_init(&u.dst4, &inp->inp_faddr, 0); 1055 return rtcache_lookup(ro, &u.dst); 1056 } 1057
Indexes created Tue Sep 23 21:09:50 GMT 2025