in_pcb.c revision 1.120
1 /* $NetBSD: in_pcb.c,v 1.120 2007/12/16 14:12:34 elad 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 The NetBSD Foundation, Inc. 34 * All rights reserved. 35 * 36 * This code is derived from software contributed to The NetBSD Foundation 37 * by Public Access Networks Corporation ("Panix"). It was developed under 38 * contract to Panix by Eric Haszlakiewicz and Thor Lancelot Simon. 39 * 40 * Redistribution and use in source and binary forms, with or without 41 * modification, are permitted provided that the following conditions 42 * are met: 43 * 1. Redistributions of source code must retain the above copyright 44 * notice, this list of conditions and the following disclaimer. 45 * 2. Redistributions in binary form must reproduce the above copyright 46 * notice, this list of conditions and the following disclaimer in the 47 * documentation and/or other materials provided with the distribution. 48 * 3. All advertising materials mentioning features or use of this software 49 * must display the following acknowledgement: 50 * This product includes software developed by the NetBSD 51 * Foundation, Inc. and its contributors. 52 * 4. Neither the name of The NetBSD Foundation nor the names of its 53 * contributors may be used to endorse or promote products derived 54 * from this software without specific prior written permission. 55 * 56 * THIS SOFTWARE IS PROVIDED BY THE NETBSD FOUNDATION, INC. AND CONTRIBUTORS 57 * ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED 58 * TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR 59 * PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE FOUNDATION OR CONTRIBUTORS 60 * BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR 61 * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF 62 * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS 63 * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN 64 * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) 65 * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE 66 * POSSIBILITY OF SUCH DAMAGE. 67 */ 68 69 /* 70 * Copyright (c) 1982, 1986, 1991, 1993, 1995 71 * The Regents of the University of California. All rights reserved. 72 * 73 * Redistribution and use in source and binary forms, with or without 74 * modification, are permitted provided that the following conditions 75 * are met: 76 * 1. Redistributions of source code must retain the above copyright 77 * notice, this list of conditions and the following disclaimer. 78 * 2. Redistributions in binary form must reproduce the above copyright 79 * notice, this list of conditions and the following disclaimer in the 80 * documentation and/or other materials provided with the distribution. 81 * 3. Neither the name of the University nor the names of its contributors 82 * may be used to endorse or promote products derived from this software 83 * without specific prior written permission. 84 * 85 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND 86 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 87 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 88 * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE 89 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 90 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 91 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 92 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 93 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 94 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 95 * SUCH DAMAGE. 96 * 97 * @(#)in_pcb.c 8.4 (Berkeley) 5/24/95 98 */ 99 100 #include <sys/cdefs.h> 101 __KERNEL_RCSID(0, "$NetBSD: in_pcb.c,v 1.120 2007/12/16 14:12:34 elad Exp $"); 102 103 #include "opt_inet.h" 104 #include "opt_ipsec.h" 105 106 #include <sys/param.h> 107 #include <sys/systm.h> 108 #include <sys/malloc.h> 109 #include <sys/mbuf.h> 110 #include <sys/protosw.h> 111 #include <sys/socket.h> 112 #include <sys/socketvar.h> 113 #include <sys/ioctl.h> 114 #include <sys/errno.h> 115 #include <sys/time.h> 116 #include <sys/pool.h> 117 #include <sys/proc.h> 118 #include <sys/kauth.h> 119 120 #include <net/if.h> 121 #include <net/route.h> 122 123 #include <netinet/in.h> 124 #include <netinet/in_systm.h> 125 #include <netinet/ip.h> 126 #include <netinet/in_pcb.h> 127 #include <netinet/in_var.h> 128 #include <netinet/ip_var.h> 129 130 #ifdef INET6 131 #include <netinet/ip6.h> 132 #include <netinet6/ip6_var.h> 133 #include <netinet6/in6_pcb.h> 134 #endif 135 136 #ifdef IPSEC 137 #include <netinet6/ipsec.h> 138 #include <netkey/key.h> 139 #elif FAST_IPSEC 140 #include <netipsec/ipsec.h> 141 #include <netipsec/key.h> 142 #endif /* IPSEC */ 143 144 struct in_addr zeroin_addr; 145 146 #define INPCBHASH_PORT(table, lport) \ 147 &(table)->inpt_porthashtbl[ntohs(lport) & (table)->inpt_porthash] 148 #define INPCBHASH_BIND(table, laddr, lport) \ 149 &(table)->inpt_bindhashtbl[ \ 150 ((ntohl((laddr).s_addr) + ntohs(lport))) & (table)->inpt_bindhash] 151 #define INPCBHASH_CONNECT(table, faddr, fport, laddr, lport) \ 152 &(table)->inpt_connecthashtbl[ \ 153 ((ntohl((faddr).s_addr) + ntohs(fport)) + \ 154 (ntohl((laddr).s_addr) + ntohs(lport))) & (table)->inpt_connecthash] 155 156 int anonportmin = IPPORT_ANONMIN; 157 int anonportmax = IPPORT_ANONMAX; 158 int lowportmin = IPPORT_RESERVEDMIN; 159 int lowportmax = IPPORT_RESERVEDMAX; 160 161 POOL_INIT(inpcb_pool, sizeof(struct inpcb), 0, 0, 0, "inpcbpl", NULL, 162 IPL_NET); 163 164 void 165 in_pcbinit(struct inpcbtable *table, int bindhashsize, int connecthashsize) 166 { 167 168 CIRCLEQ_INIT(&table->inpt_queue); 169 table->inpt_porthashtbl = hashinit(bindhashsize, HASH_LIST, M_PCB, 170 M_WAITOK, &table->inpt_porthash); 171 table->inpt_bindhashtbl = hashinit(bindhashsize, HASH_LIST, M_PCB, 172 M_WAITOK, &table->inpt_bindhash); 173 table->inpt_connecthashtbl = hashinit(connecthashsize, HASH_LIST, 174 M_PCB, M_WAITOK, &table->inpt_connecthash); 175 table->inpt_lastlow = IPPORT_RESERVEDMAX; 176 table->inpt_lastport = (u_int16_t)anonportmax; 177 } 178 179 int 180 in_pcballoc(struct socket *so, void *v) 181 { 182 struct inpcbtable *table = v; 183 struct inpcb *inp; 184 int s; 185 #if defined(IPSEC) || defined(FAST_IPSEC) 186 int error; 187 #endif 188 189 s = splnet(); 190 inp = pool_get(&inpcb_pool, PR_NOWAIT); 191 splx(s); 192 if (inp == NULL) 193 return (ENOBUFS); 194 bzero((void *)inp, sizeof(*inp)); 195 inp->inp_af = AF_INET; 196 inp->inp_table = table; 197 inp->inp_socket = so; 198 inp->inp_errormtu = -1; 199 #if defined(IPSEC) || defined(FAST_IPSEC) 200 error = ipsec_init_pcbpolicy(so, &inp->inp_sp); 201 if (error != 0) { 202 s = splnet(); 203 pool_put(&inpcb_pool, inp); 204 splx(s); 205 return error; 206 } 207 #endif 208 so->so_pcb = inp; 209 s = splnet(); 210 CIRCLEQ_INSERT_HEAD(&table->inpt_queue, &inp->inp_head, 211 inph_queue); 212 LIST_INSERT_HEAD(INPCBHASH_PORT(table, inp->inp_lport), &inp->inp_head, 213 inph_lhash); 214 in_pcbstate(inp, INP_ATTACHED); 215 splx(s); 216 return (0); 217 } 218 219 int 220 in_pcbbind(void *v, struct mbuf *nam, struct lwp *l) 221 { 222 struct in_ifaddr *ia = NULL; 223 struct inpcb *inp = v; 224 struct socket *so = inp->inp_socket; 225 struct inpcbtable *table = inp->inp_table; 226 struct sockaddr_in *sin = NULL; /* XXXGCC */ 227 u_int16_t lport = 0; 228 int wild = 0, reuseport = (so->so_options & SO_REUSEPORT); 229 kauth_cred_t cred = l->l_cred; 230 231 if (inp->inp_af != AF_INET) 232 return (EINVAL); 233 234 if (TAILQ_FIRST(&in_ifaddrhead) == 0) 235 return (EADDRNOTAVAIL); 236 if (inp->inp_lport || !in_nullhost(inp->inp_laddr)) 237 return (EINVAL); 238 if ((so->so_options & (SO_REUSEADDR|SO_REUSEPORT)) == 0) 239 wild = 1; 240 if (nam == 0) 241 goto noname; 242 sin = mtod(nam, struct sockaddr_in *); 243 if (nam->m_len != sizeof (*sin)) 244 return (EINVAL); 245 if (sin->sin_family != AF_INET) 246 return (EAFNOSUPPORT); 247 lport = sin->sin_port; 248 if (IN_MULTICAST(sin->sin_addr.s_addr)) { 249 /* 250 * Treat SO_REUSEADDR as SO_REUSEPORT for multicast; 251 * allow complete duplication of binding if 252 * SO_REUSEPORT is set, or if SO_REUSEADDR is set 253 * and a multicast address is bound on both 254 * new and duplicated sockets. 255 */ 256 if (so->so_options & SO_REUSEADDR) 257 reuseport = SO_REUSEADDR|SO_REUSEPORT; 258 } else if (!in_nullhost(sin->sin_addr)) { 259 sin->sin_port = 0; /* yech... */ 260 INADDR_TO_IA(sin->sin_addr, ia); 261 /* check for broadcast addresses */ 262 if (ia == NULL) 263 ia = ifatoia(ifa_ifwithaddr(sintosa(sin))); 264 if (ia == NULL) 265 return (EADDRNOTAVAIL); 266 } 267 if (lport) { 268 struct inpcb *t; 269 #ifdef INET6 270 struct in6pcb *t6; 271 struct in6_addr mapped; 272 #endif 273 #ifndef IPNOPRIVPORTS 274 /* GROSS */ 275 if (ntohs(lport) < IPPORT_RESERVED && 276 kauth_authorize_network(cred, 277 KAUTH_NETWORK_BIND, 278 KAUTH_REQ_NETWORK_BIND_PRIVPORT, so, sin, 279 NULL)) 280 return (EACCES); 281 #endif 282 #ifdef INET6 283 memset(&mapped, 0, sizeof(mapped)); 284 mapped.s6_addr16[5] = 0xffff; 285 memcpy(&mapped.s6_addr32[3], &sin->sin_addr, 286 sizeof(mapped.s6_addr32[3])); 287 t6 = in6_pcblookup_port(table, &mapped, lport, wild); 288 if (t6 && (reuseport & t6->in6p_socket->so_options) == 0) 289 return (EADDRINUSE); 290 #endif 291 if (so->so_uidinfo->ui_uid && !IN_MULTICAST(sin->sin_addr.s_addr)) { 292 t = in_pcblookup_port(table, sin->sin_addr, lport, 1); 293 /* 294 * XXX: investigate ramifications of loosening this 295 * restriction so that as long as both ports have 296 * SO_REUSEPORT allow the bind 297 */ 298 if (t && 299 (!in_nullhost(sin->sin_addr) || 300 !in_nullhost(t->inp_laddr) || 301 (t->inp_socket->so_options & SO_REUSEPORT) == 0) 302 && (so->so_uidinfo->ui_uid != t->inp_socket->so_uidinfo->ui_uid)) { 303 return (EADDRINUSE); 304 } 305 } 306 t = in_pcblookup_port(table, sin->sin_addr, lport, wild); 307 if (t && (reuseport & t->inp_socket->so_options) == 0) 308 return (EADDRINUSE); 309 } 310 inp->inp_laddr = sin->sin_addr; 311 312 noname: 313 if (lport == 0) { 314 int cnt; 315 u_int16_t mymin, mymax; 316 u_int16_t *lastport; 317 318 if (inp->inp_flags & INP_LOWPORT) { 319 #ifndef IPNOPRIVPORTS 320 if (kauth_authorize_network(cred, 321 KAUTH_NETWORK_BIND, 322 KAUTH_REQ_NETWORK_BIND_PRIVPORT, so, 323 sin, NULL)) 324 return (EACCES); 325 #endif 326 mymin = lowportmin; 327 mymax = lowportmax; 328 lastport = &table->inpt_lastlow; 329 } else { 330 mymin = anonportmin; 331 mymax = anonportmax; 332 lastport = &table->inpt_lastport; 333 } 334 if (mymin > mymax) { /* sanity check */ 335 u_int16_t swp; 336 337 swp = mymin; 338 mymin = mymax; 339 mymax = swp; 340 } 341 342 lport = *lastport - 1; 343 for (cnt = mymax - mymin + 1; cnt; cnt--, lport--) { 344 if (lport < mymin || lport > mymax) 345 lport = mymax; 346 if (!in_pcblookup_port(table, inp->inp_laddr, 347 htons(lport), 1)) 348 goto found; 349 } 350 if (!in_nullhost(inp->inp_laddr)) 351 inp->inp_laddr.s_addr = INADDR_ANY; 352 return (EAGAIN); 353 found: 354 inp->inp_flags |= INP_ANONPORT; 355 *lastport = lport; 356 lport = htons(lport); 357 } 358 inp->inp_lport = lport; 359 LIST_REMOVE(&inp->inp_head, inph_lhash); 360 LIST_INSERT_HEAD(INPCBHASH_PORT(table, inp->inp_lport), &inp->inp_head, 361 inph_lhash); 362 in_pcbstate(inp, INP_BOUND); 363 return (0); 364 } 365 366 /* 367 * Connect from a socket to a specified address. 368 * Both address and port must be specified in argument sin. 369 * If don't have a local address for this socket yet, 370 * then pick one. 371 */ 372 int 373 in_pcbconnect(void *v, struct mbuf *nam, struct lwp *l) 374 { 375 struct inpcb *inp = v; 376 struct in_ifaddr *ia = NULL; 377 struct sockaddr_in *ifaddr = NULL; 378 struct sockaddr_in *sin = mtod(nam, struct sockaddr_in *); 379 int error; 380 381 if (inp->inp_af != AF_INET) 382 return (EINVAL); 383 384 if (nam->m_len != sizeof (*sin)) 385 return (EINVAL); 386 if (sin->sin_family != AF_INET) 387 return (EAFNOSUPPORT); 388 if (sin->sin_port == 0) 389 return (EADDRNOTAVAIL); 390 if (TAILQ_FIRST(&in_ifaddrhead) != 0) { 391 /* 392 * If the destination address is INADDR_ANY, 393 * use any local address (likely loopback). 394 * If the supplied address is INADDR_BROADCAST, 395 * use the broadcast address of an interface 396 * which supports broadcast. (loopback does not) 397 */ 398 399 if (in_nullhost(sin->sin_addr)) { 400 sin->sin_addr = 401 TAILQ_FIRST(&in_ifaddrhead)->ia_addr.sin_addr; 402 } else if (sin->sin_addr.s_addr == INADDR_BROADCAST) { 403 TAILQ_FOREACH(ia, &in_ifaddrhead, ia_list) { 404 if (ia->ia_ifp->if_flags & IFF_BROADCAST) { 405 sin->sin_addr = 406 ia->ia_broadaddr.sin_addr; 407 break; 408 } 409 } 410 } 411 } 412 /* 413 * If we haven't bound which network number to use as ours, 414 * we will use the number of the outgoing interface. 415 * This depends on having done a routing lookup, which 416 * we will probably have to do anyway, so we might 417 * as well do it now. On the other hand if we are 418 * sending to multiple destinations we may have already 419 * done the lookup, so see if we can use the route 420 * from before. In any case, we only 421 * chose a port number once, even if sending to multiple 422 * destinations. 423 */ 424 if (in_nullhost(inp->inp_laddr)) { 425 int xerror; 426 ifaddr = in_selectsrc(sin, &inp->inp_route, 427 inp->inp_socket->so_options, inp->inp_moptions, &xerror); 428 if (ifaddr == NULL) { 429 if (xerror == 0) 430 xerror = EADDRNOTAVAIL; 431 return xerror; 432 } 433 INADDR_TO_IA(ifaddr->sin_addr, ia); 434 if (ia == NULL) 435 return (EADDRNOTAVAIL); 436 } 437 if (in_pcblookup_connect(inp->inp_table, sin->sin_addr, sin->sin_port, 438 !in_nullhost(inp->inp_laddr) ? inp->inp_laddr : ifaddr->sin_addr, 439 inp->inp_lport) != 0) 440 return (EADDRINUSE); 441 if (in_nullhost(inp->inp_laddr)) { 442 if (inp->inp_lport == 0) { 443 error = in_pcbbind(inp, NULL, l); 444 /* 445 * This used to ignore the return value 446 * completely, but we need to check for 447 * ephemeral port shortage. 448 * And attempts to request low ports if not root. 449 */ 450 if (error != 0) 451 return (error); 452 } 453 inp->inp_laddr = ifaddr->sin_addr; 454 } 455 inp->inp_faddr = sin->sin_addr; 456 inp->inp_fport = sin->sin_port; 457 in_pcbstate(inp, INP_CONNECTED); 458 #if defined(IPSEC) || defined(FAST_IPSEC) 459 if (inp->inp_socket->so_type == SOCK_STREAM) 460 ipsec_pcbconn(inp->inp_sp); 461 #endif 462 return (0); 463 } 464 465 void 466 in_pcbdisconnect(void *v) 467 { 468 struct inpcb *inp = v; 469 470 if (inp->inp_af != AF_INET) 471 return; 472 473 inp->inp_faddr = zeroin_addr; 474 inp->inp_fport = 0; 475 in_pcbstate(inp, INP_BOUND); 476 #if defined(IPSEC) || defined(FAST_IPSEC) 477 ipsec_pcbdisconn(inp->inp_sp); 478 #endif 479 if (inp->inp_socket->so_state & SS_NOFDREF) 480 in_pcbdetach(inp); 481 } 482 483 void 484 in_pcbdetach(void *v) 485 { 486 struct inpcb *inp = v; 487 struct socket *so = inp->inp_socket; 488 int s; 489 490 if (inp->inp_af != AF_INET) 491 return; 492 493 #if defined(IPSEC) || defined(FAST_IPSEC) 494 ipsec4_delete_pcbpolicy(inp); 495 #endif /*IPSEC*/ 496 so->so_pcb = 0; 497 sofree(so); 498 if (inp->inp_options) 499 (void)m_free(inp->inp_options); 500 rtcache_free(&inp->inp_route); 501 ip_freemoptions(inp->inp_moptions); 502 s = splnet(); 503 in_pcbstate(inp, INP_ATTACHED); 504 LIST_REMOVE(&inp->inp_head, inph_lhash); 505 CIRCLEQ_REMOVE(&inp->inp_table->inpt_queue, &inp->inp_head, 506 inph_queue); 507 pool_put(&inpcb_pool, inp); 508 splx(s); 509 } 510 511 void 512 in_setsockaddr(struct inpcb *inp, struct mbuf *nam) 513 { 514 struct sockaddr_in *sin; 515 516 if (inp->inp_af != AF_INET) 517 return; 518 519 sin = mtod(nam, struct sockaddr_in *); 520 sockaddr_in_init(sin, &inp->inp_laddr, inp->inp_lport); 521 nam->m_len = sin->sin_len; 522 } 523 524 void 525 in_setpeeraddr(struct inpcb *inp, struct mbuf *nam) 526 { 527 struct sockaddr_in *sin; 528 529 if (inp->inp_af != AF_INET) 530 return; 531 532 sin = mtod(nam, struct sockaddr_in *); 533 sockaddr_in_init(sin, &inp->inp_faddr, inp->inp_fport); 534 nam->m_len = sin->sin_len; 535 } 536 537 /* 538 * Pass some notification to all connections of a protocol 539 * associated with address dst. The local address and/or port numbers 540 * may be specified to limit the search. The "usual action" will be 541 * taken, depending on the ctlinput cmd. The caller must filter any 542 * cmds that are uninteresting (e.g., no error in the map). 543 * Call the protocol specific routine (if any) to report 544 * any errors for each matching socket. 545 * 546 * Must be called at splsoftnet. 547 */ 548 int 549 in_pcbnotify(struct inpcbtable *table, struct in_addr faddr, u_int fport_arg, 550 struct in_addr laddr, u_int lport_arg, int errno, 551 void (*notify)(struct inpcb *, int)) 552 { 553 struct inpcbhead *head; 554 struct inpcb *inp, *ninp; 555 u_int16_t fport = fport_arg, lport = lport_arg; 556 int nmatch; 557 558 if (in_nullhost(faddr) || notify == 0) 559 return (0); 560 561 nmatch = 0; 562 head = INPCBHASH_CONNECT(table, faddr, fport, laddr, lport); 563 for (inp = (struct inpcb *)LIST_FIRST(head); inp != NULL; inp = ninp) { 564 ninp = (struct inpcb *)LIST_NEXT(inp, inp_hash); 565 if (inp->inp_af != AF_INET) 566 continue; 567 if (in_hosteq(inp->inp_faddr, faddr) && 568 inp->inp_fport == fport && 569 inp->inp_lport == lport && 570 in_hosteq(inp->inp_laddr, laddr)) { 571 (*notify)(inp, errno); 572 nmatch++; 573 } 574 } 575 return (nmatch); 576 } 577 578 void 579 in_pcbnotifyall(struct inpcbtable *table, struct in_addr faddr, int errno, 580 void (*notify)(struct inpcb *, int)) 581 { 582 struct inpcb *inp, *ninp; 583 584 if (in_nullhost(faddr) || notify == 0) 585 return; 586 587 for (inp = (struct inpcb *)CIRCLEQ_FIRST(&table->inpt_queue); 588 inp != (void *)&table->inpt_queue; 589 inp = ninp) { 590 ninp = (struct inpcb *)CIRCLEQ_NEXT(inp, inp_queue); 591 if (inp->inp_af != AF_INET) 592 continue; 593 if (in_hosteq(inp->inp_faddr, faddr)) 594 (*notify)(inp, errno); 595 } 596 } 597 598 void 599 in_pcbpurgeif0(struct inpcbtable *table, struct ifnet *ifp) 600 { 601 struct inpcb *inp, *ninp; 602 struct ip_moptions *imo; 603 int i, gap; 604 605 for (inp = (struct inpcb *)CIRCLEQ_FIRST(&table->inpt_queue); 606 inp != (void *)&table->inpt_queue; 607 inp = ninp) { 608 ninp = (struct inpcb *)CIRCLEQ_NEXT(inp, inp_queue); 609 if (inp->inp_af != AF_INET) 610 continue; 611 imo = inp->inp_moptions; 612 if (imo != NULL) { 613 /* 614 * Unselect the outgoing interface if it is being 615 * detached. 616 */ 617 if (imo->imo_multicast_ifp == ifp) 618 imo->imo_multicast_ifp = NULL; 619 620 /* 621 * Drop multicast group membership if we joined 622 * through the interface being detached. 623 */ 624 for (i = 0, gap = 0; i < imo->imo_num_memberships; 625 i++) { 626 if (imo->imo_membership[i]->inm_ifp == ifp) { 627 in_delmulti(imo->imo_membership[i]); 628 gap++; 629 } else if (gap != 0) 630 imo->imo_membership[i - gap] = 631 imo->imo_membership[i]; 632 } 633 imo->imo_num_memberships -= gap; 634 } 635 } 636 } 637 638 void 639 in_pcbpurgeif(struct inpcbtable *table, struct ifnet *ifp) 640 { 641 struct inpcb *inp, *ninp; 642 643 for (inp = (struct inpcb *)CIRCLEQ_FIRST(&table->inpt_queue); 644 inp != (void *)&table->inpt_queue; 645 inp = ninp) { 646 ninp = (struct inpcb *)CIRCLEQ_NEXT(inp, inp_queue); 647 if (inp->inp_af != AF_INET) 648 continue; 649 if (inp->inp_route.ro_rt != NULL && 650 inp->inp_route.ro_rt->rt_ifp == ifp) 651 in_rtchange(inp, 0); 652 } 653 } 654 655 /* 656 * Check for alternatives when higher level complains 657 * about service problems. For now, invalidate cached 658 * routing information. If the route was created dynamically 659 * (by a redirect), time to try a default gateway again. 660 */ 661 void 662 in_losing(struct inpcb *inp) 663 { 664 struct rtentry *rt; 665 struct rt_addrinfo info; 666 667 if (inp->inp_af != AF_INET) 668 return; 669 670 if ((rt = inp->inp_route.ro_rt) != NULL) { 671 memset(&info, 0, sizeof(info)); 672 info.rti_info[RTAX_DST] = rtcache_getdst(&inp->inp_route); 673 info.rti_info[RTAX_GATEWAY] = rt->rt_gateway; 674 info.rti_info[RTAX_NETMASK] = rt_mask(rt); 675 rt_missmsg(RTM_LOSING, &info, rt->rt_flags, 0); 676 if (rt->rt_flags & RTF_DYNAMIC) 677 (void) rtrequest(RTM_DELETE, rt_getkey(rt), 678 rt->rt_gateway, rt_mask(rt), rt->rt_flags, 679 NULL); 680 /* 681 * A new route can be allocated 682 * the next time output is attempted. 683 */ 684 rtcache_free(&inp->inp_route); 685 } 686 } 687 688 /* 689 * After a routing change, flush old routing. A new route can be 690 * allocated the next time output is attempted. 691 */ 692 void 693 in_rtchange(struct inpcb *inp, int errno) 694 { 695 696 if (inp->inp_af != AF_INET) 697 return; 698 699 rtcache_free(&inp->inp_route); 700 701 /* XXX SHOULD NOTIFY HIGHER-LEVEL PROTOCOLS */ 702 } 703 704 struct inpcb * 705 in_pcblookup_port(struct inpcbtable *table, struct in_addr laddr, 706 u_int lport_arg, int lookup_wildcard) 707 { 708 struct inpcbhead *head; 709 struct inpcb_hdr *inph; 710 struct inpcb *inp, *match = 0; 711 int matchwild = 3, wildcard; 712 u_int16_t lport = lport_arg; 713 714 head = INPCBHASH_PORT(table, lport); 715 LIST_FOREACH(inph, head, inph_lhash) { 716 inp = (struct inpcb *)inph; 717 if (inp->inp_af != AF_INET) 718 continue; 719 720 if (inp->inp_lport != lport) 721 continue; 722 wildcard = 0; 723 if (!in_nullhost(inp->inp_faddr)) 724 wildcard++; 725 if (in_nullhost(inp->inp_laddr)) { 726 if (!in_nullhost(laddr)) 727 wildcard++; 728 } else { 729 if (in_nullhost(laddr)) 730 wildcard++; 731 else { 732 if (!in_hosteq(inp->inp_laddr, laddr)) 733 continue; 734 } 735 } 736 if (wildcard && !lookup_wildcard) 737 continue; 738 if (wildcard < matchwild) { 739 match = inp; 740 matchwild = wildcard; 741 if (matchwild == 0) 742 break; 743 } 744 } 745 return (match); 746 } 747 748 #ifdef DIAGNOSTIC 749 int in_pcbnotifymiss = 0; 750 #endif 751 752 struct inpcb * 753 in_pcblookup_connect(struct inpcbtable *table, 754 struct in_addr faddr, u_int fport_arg, 755 struct in_addr laddr, u_int lport_arg) 756 { 757 struct inpcbhead *head; 758 struct inpcb_hdr *inph; 759 struct inpcb *inp; 760 u_int16_t fport = fport_arg, lport = lport_arg; 761 762 head = INPCBHASH_CONNECT(table, faddr, fport, laddr, lport); 763 LIST_FOREACH(inph, head, inph_hash) { 764 inp = (struct inpcb *)inph; 765 if (inp->inp_af != AF_INET) 766 continue; 767 768 if (in_hosteq(inp->inp_faddr, faddr) && 769 inp->inp_fport == fport && 770 inp->inp_lport == lport && 771 in_hosteq(inp->inp_laddr, laddr)) 772 goto out; 773 } 774 #ifdef DIAGNOSTIC 775 if (in_pcbnotifymiss) { 776 printf("in_pcblookup_connect: faddr=%08x fport=%d laddr=%08x lport=%d\n", 777 ntohl(faddr.s_addr), ntohs(fport), 778 ntohl(laddr.s_addr), ntohs(lport)); 779 } 780 #endif 781 return (0); 782 783 out: 784 /* Move this PCB to the head of hash chain. */ 785 inph = &inp->inp_head; 786 if (inph != LIST_FIRST(head)) { 787 LIST_REMOVE(inph, inph_hash); 788 LIST_INSERT_HEAD(head, inph, inph_hash); 789 } 790 return (inp); 791 } 792 793 struct inpcb * 794 in_pcblookup_bind(struct inpcbtable *table, 795 struct in_addr laddr, u_int lport_arg) 796 { 797 struct inpcbhead *head; 798 struct inpcb_hdr *inph; 799 struct inpcb *inp; 800 u_int16_t lport = lport_arg; 801 802 head = INPCBHASH_BIND(table, laddr, lport); 803 LIST_FOREACH(inph, head, inph_hash) { 804 inp = (struct inpcb *)inph; 805 if (inp->inp_af != AF_INET) 806 continue; 807 808 if (inp->inp_lport == lport && 809 in_hosteq(inp->inp_laddr, laddr)) 810 goto out; 811 } 812 head = INPCBHASH_BIND(table, zeroin_addr, lport); 813 LIST_FOREACH(inph, head, inph_hash) { 814 inp = (struct inpcb *)inph; 815 if (inp->inp_af != AF_INET) 816 continue; 817 818 if (inp->inp_lport == lport && 819 in_hosteq(inp->inp_laddr, zeroin_addr)) 820 goto out; 821 } 822 #ifdef DIAGNOSTIC 823 if (in_pcbnotifymiss) { 824 printf("in_pcblookup_bind: laddr=%08x lport=%d\n", 825 ntohl(laddr.s_addr), ntohs(lport)); 826 } 827 #endif 828 return (0); 829 830 out: 831 /* Move this PCB to the head of hash chain. */ 832 inph = &inp->inp_head; 833 if (inph != LIST_FIRST(head)) { 834 LIST_REMOVE(inph, inph_hash); 835 LIST_INSERT_HEAD(head, inph, inph_hash); 836 } 837 return (inp); 838 } 839 840 void 841 in_pcbstate(struct inpcb *inp, int state) 842 { 843 844 if (inp->inp_af != AF_INET) 845 return; 846 847 if (inp->inp_state > INP_ATTACHED) 848 LIST_REMOVE(&inp->inp_head, inph_hash); 849 850 switch (state) { 851 case INP_BOUND: 852 LIST_INSERT_HEAD(INPCBHASH_BIND(inp->inp_table, 853 inp->inp_laddr, inp->inp_lport), &inp->inp_head, 854 inph_hash); 855 break; 856 case INP_CONNECTED: 857 LIST_INSERT_HEAD(INPCBHASH_CONNECT(inp->inp_table, 858 inp->inp_faddr, inp->inp_fport, 859 inp->inp_laddr, inp->inp_lport), &inp->inp_head, 860 inph_hash); 861 break; 862 } 863 864 inp->inp_state = state; 865 } 866 867 struct rtentry * 868 in_pcbrtentry(struct inpcb *inp) 869 { 870 struct route *ro; 871 union { 872 struct sockaddr dst; 873 struct sockaddr_in dst4; 874 } u; 875 876 if (inp->inp_af != AF_INET) 877 return (NULL); 878 879 ro = &inp->inp_route; 880 881 sockaddr_in_init(&u.dst4, &inp->inp_faddr, 0); 882 return rtcache_lookup(ro, &u.dst); 883 } 884 885 struct sockaddr_in * 886 in_selectsrc(struct sockaddr_in *sin, struct route *ro, 887 int soopts, struct ip_moptions *mopts, int *errorp) 888 { 889 struct in_ifaddr *ia = NULL; 890 891 /* 892 * If route is known or can be allocated now, take the 893 * source address from the interface. Otherwise, punt. 894 */ 895 if ((soopts & SO_DONTROUTE) != 0) 896 rtcache_free(ro); 897 else { 898 union { 899 struct sockaddr dst; 900 struct sockaddr_in dst4; 901 } u; 902 903 sockaddr_in_init(&u.dst4, &sin->sin_addr, 0); 904 (void)rtcache_lookup(ro, &u.dst); 905 } 906 /* 907 * If we found a route, use the address 908 * corresponding to the outgoing interface 909 * unless it is the loopback (in case a route 910 * to our address on another net goes to loopback). 911 * 912 * XXX Is this still true? Do we care? 913 */ 914 if (ro->ro_rt != NULL && !(ro->ro_rt->rt_ifp->if_flags & IFF_LOOPBACK)) 915 ia = ifatoia(ro->ro_rt->rt_ifa); 916 if (ia == NULL) { 917 u_int16_t fport = sin->sin_port; 918 919 sin->sin_port = 0; 920 ia = ifatoia(ifa_ifwithladdr(sintosa(sin))); 921 sin->sin_port = fport; 922 if (ia == NULL) { 923 /* Find 1st non-loopback AF_INET address */ 924 TAILQ_FOREACH(ia, &in_ifaddrhead, ia_list) { 925 if (!(ia->ia_ifp->if_flags & IFF_LOOPBACK)) 926 break; 927 } 928 } 929 if (ia == NULL) { 930 *errorp = EADDRNOTAVAIL; 931 return NULL; 932 } 933 } 934 /* 935 * If the destination address is multicast and an outgoing 936 * interface has been set as a multicast option, use the 937 * address of that interface as our source address. 938 */ 939 if (IN_MULTICAST(sin->sin_addr.s_addr) && mopts != NULL) { 940 struct ip_moptions *imo; 941 struct ifnet *ifp; 942 943 imo = mopts; 944 if (imo->imo_multicast_ifp != NULL) { 945 ifp = imo->imo_multicast_ifp; 946 IFP_TO_IA(ifp, ia); /* XXX */ 947 if (ia == 0) { 948 *errorp = EADDRNOTAVAIL; 949 return NULL; 950 } 951 } 952 } 953 if (ia->ia_ifa.ifa_getifa != NULL) { 954 ia = ifatoia((*ia->ia_ifa.ifa_getifa)(&ia->ia_ifa, 955 sintosa(sin))); 956 } 957 #ifdef GETIFA_DEBUG 958 else 959 printf("%s: missing ifa_getifa\n", __func__); 960 #endif 961 return satosin(&ia->ia_addr); 962 } 963
Indexes created Tue Sep 23 14:10:03 GMT 2025