in_pcb.c revision 1.119
1 /* $NetBSD: in_pcb.c,v 1.119 2007/08/21 08:34:33 dyoung 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 1.119 2007/08/21 08:34:33 dyoung 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); 229 230 if (inp->inp_af != AF_INET) 231 return (EINVAL); 232 233 if (TAILQ_FIRST(&in_ifaddrhead) == 0) 234 return (EADDRNOTAVAIL); 235 if (inp->inp_lport || !in_nullhost(inp->inp_laddr)) 236 return (EINVAL); 237 if ((so->so_options & (SO_REUSEADDR|SO_REUSEPORT)) == 0) 238 wild = 1; 239 if (nam == 0) 240 goto noname; 241 sin = mtod(nam, struct sockaddr_in *); 242 if (nam->m_len != sizeof (*sin)) 243 return (EINVAL); 244 if (sin->sin_family != AF_INET) 245 return (EAFNOSUPPORT); 246 lport = sin->sin_port; 247 if (IN_MULTICAST(sin->sin_addr.s_addr)) { 248 /* 249 * Treat SO_REUSEADDR as SO_REUSEPORT for multicast; 250 * allow complete duplication of binding if 251 * SO_REUSEPORT is set, or if SO_REUSEADDR is set 252 * and a multicast address is bound on both 253 * new and duplicated sockets. 254 */ 255 if (so->so_options & SO_REUSEADDR) 256 reuseport = SO_REUSEADDR|SO_REUSEPORT; 257 } else if (!in_nullhost(sin->sin_addr)) { 258 sin->sin_port = 0; /* yech... */ 259 INADDR_TO_IA(sin->sin_addr, ia); 260 /* check for broadcast addresses */ 261 if (ia == NULL) 262 ia = ifatoia(ifa_ifwithaddr(sintosa(sin))); 263 if (ia == NULL) 264 return (EADDRNOTAVAIL); 265 } 266 if (lport) { 267 struct inpcb *t; 268 #ifdef INET6 269 struct in6pcb *t6; 270 struct in6_addr mapped; 271 #endif 272 #ifndef IPNOPRIVPORTS 273 /* GROSS */ 274 if (ntohs(lport) < IPPORT_RESERVED && 275 (l == 0 || kauth_authorize_network(l->l_cred, 276 KAUTH_NETWORK_BIND, 277 KAUTH_REQ_NETWORK_BIND_PRIVPORT, so, sin, 278 NULL))) 279 return (EACCES); 280 #endif 281 #ifdef INET6 282 memset(&mapped, 0, sizeof(mapped)); 283 mapped.s6_addr16[5] = 0xffff; 284 memcpy(&mapped.s6_addr32[3], &sin->sin_addr, 285 sizeof(mapped.s6_addr32[3])); 286 t6 = in6_pcblookup_port(table, &mapped, lport, wild); 287 if (t6 && (reuseport & t6->in6p_socket->so_options) == 0) 288 return (EADDRINUSE); 289 #endif 290 if (so->so_uidinfo->ui_uid && !IN_MULTICAST(sin->sin_addr.s_addr)) { 291 t = in_pcblookup_port(table, sin->sin_addr, lport, 1); 292 /* 293 * XXX: investigate ramifications of loosening this 294 * restriction so that as long as both ports have 295 * SO_REUSEPORT allow the bind 296 */ 297 if (t && 298 (!in_nullhost(sin->sin_addr) || 299 !in_nullhost(t->inp_laddr) || 300 (t->inp_socket->so_options & SO_REUSEPORT) == 0) 301 && (so->so_uidinfo->ui_uid != t->inp_socket->so_uidinfo->ui_uid)) { 302 return (EADDRINUSE); 303 } 304 } 305 t = in_pcblookup_port(table, sin->sin_addr, lport, wild); 306 if (t && (reuseport & t->inp_socket->so_options) == 0) 307 return (EADDRINUSE); 308 } 309 inp->inp_laddr = sin->sin_addr; 310 311 noname: 312 if (lport == 0) { 313 int cnt; 314 u_int16_t mymin, mymax; 315 u_int16_t *lastport; 316 317 if (inp->inp_flags & INP_LOWPORT) { 318 #ifndef IPNOPRIVPORTS 319 if (l == 0 || kauth_authorize_network(l->l_cred, 320 KAUTH_NETWORK_BIND, 321 KAUTH_REQ_NETWORK_BIND_PRIVPORT, so, 322 sin, NULL)) 323 return (EACCES); 324 #endif 325 mymin = lowportmin; 326 mymax = lowportmax; 327 lastport = &table->inpt_lastlow; 328 } else { 329 mymin = anonportmin; 330 mymax = anonportmax; 331 lastport = &table->inpt_lastport; 332 } 333 if (mymin > mymax) { /* sanity check */ 334 u_int16_t swp; 335 336 swp = mymin; 337 mymin = mymax; 338 mymax = swp; 339 } 340 341 lport = *lastport - 1; 342 for (cnt = mymax - mymin + 1; cnt; cnt--, lport--) { 343 if (lport < mymin || lport > mymax) 344 lport = mymax; 345 if (!in_pcblookup_port(table, inp->inp_laddr, 346 htons(lport), 1)) 347 goto found; 348 } 349 if (!in_nullhost(inp->inp_laddr)) 350 inp->inp_laddr.s_addr = INADDR_ANY; 351 return (EAGAIN); 352 found: 353 inp->inp_flags |= INP_ANONPORT; 354 *lastport = lport; 355 lport = htons(lport); 356 } 357 inp->inp_lport = lport; 358 LIST_REMOVE(&inp->inp_head, inph_lhash); 359 LIST_INSERT_HEAD(INPCBHASH_PORT(table, inp->inp_lport), &inp->inp_head, 360 inph_lhash); 361 in_pcbstate(inp, INP_BOUND); 362 return (0); 363 } 364 365 /* 366 * Connect from a socket to a specified address. 367 * Both address and port must be specified in argument sin. 368 * If don't have a local address for this socket yet, 369 * then pick one. 370 */ 371 int 372 in_pcbconnect(void *v, struct mbuf *nam, struct lwp *l) 373 { 374 struct inpcb *inp = v; 375 struct in_ifaddr *ia = NULL; 376 struct sockaddr_in *ifaddr = NULL; 377 struct sockaddr_in *sin = mtod(nam, struct sockaddr_in *); 378 int error; 379 380 if (inp->inp_af != AF_INET) 381 return (EINVAL); 382 383 if (nam->m_len != sizeof (*sin)) 384 return (EINVAL); 385 if (sin->sin_family != AF_INET) 386 return (EAFNOSUPPORT); 387 if (sin->sin_port == 0) 388 return (EADDRNOTAVAIL); 389 if (TAILQ_FIRST(&in_ifaddrhead) != 0) { 390 /* 391 * If the destination address is INADDR_ANY, 392 * use any local address (likely loopback). 393 * If the supplied address is INADDR_BROADCAST, 394 * use the broadcast address of an interface 395 * which supports broadcast. (loopback does not) 396 */ 397 398 if (in_nullhost(sin->sin_addr)) { 399 sin->sin_addr = 400 TAILQ_FIRST(&in_ifaddrhead)->ia_addr.sin_addr; 401 } else if (sin->sin_addr.s_addr == INADDR_BROADCAST) { 402 TAILQ_FOREACH(ia, &in_ifaddrhead, ia_list) { 403 if (ia->ia_ifp->if_flags & IFF_BROADCAST) { 404 sin->sin_addr = 405 ia->ia_broadaddr.sin_addr; 406 break; 407 } 408 } 409 } 410 } 411 /* 412 * If we haven't bound which network number to use as ours, 413 * we will use the number of the outgoing interface. 414 * This depends on having done a routing lookup, which 415 * we will probably have to do anyway, so we might 416 * as well do it now. On the other hand if we are 417 * sending to multiple destinations we may have already 418 * done the lookup, so see if we can use the route 419 * from before. In any case, we only 420 * chose a port number once, even if sending to multiple 421 * destinations. 422 */ 423 if (in_nullhost(inp->inp_laddr)) { 424 int xerror; 425 ifaddr = in_selectsrc(sin, &inp->inp_route, 426 inp->inp_socket->so_options, inp->inp_moptions, &xerror); 427 if (ifaddr == NULL) { 428 if (xerror == 0) 429 xerror = EADDRNOTAVAIL; 430 return xerror; 431 } 432 INADDR_TO_IA(ifaddr->sin_addr, ia); 433 if (ia == NULL) 434 return (EADDRNOTAVAIL); 435 } 436 if (in_pcblookup_connect(inp->inp_table, sin->sin_addr, sin->sin_port, 437 !in_nullhost(inp->inp_laddr) ? inp->inp_laddr : ifaddr->sin_addr, 438 inp->inp_lport) != 0) 439 return (EADDRINUSE); 440 if (in_nullhost(inp->inp_laddr)) { 441 if (inp->inp_lport == 0) { 442 error = in_pcbbind(inp, NULL, l); 443 /* 444 * This used to ignore the return value 445 * completely, but we need to check for 446 * ephemeral port shortage. 447 * And attempts to request low ports if not root. 448 */ 449 if (error != 0) 450 return (error); 451 } 452 inp->inp_laddr = ifaddr->sin_addr; 453 } 454 inp->inp_faddr = sin->sin_addr; 455 inp->inp_fport = sin->sin_port; 456 in_pcbstate(inp, INP_CONNECTED); 457 #if defined(IPSEC) || defined(FAST_IPSEC) 458 if (inp->inp_socket->so_type == SOCK_STREAM) 459 ipsec_pcbconn(inp->inp_sp); 460 #endif 461 return (0); 462 } 463 464 void 465 in_pcbdisconnect(void *v) 466 { 467 struct inpcb *inp = v; 468 469 if (inp->inp_af != AF_INET) 470 return; 471 472 inp->inp_faddr = zeroin_addr; 473 inp->inp_fport = 0; 474 in_pcbstate(inp, INP_BOUND); 475 #if defined(IPSEC) || defined(FAST_IPSEC) 476 ipsec_pcbdisconn(inp->inp_sp); 477 #endif 478 if (inp->inp_socket->so_state & SS_NOFDREF) 479 in_pcbdetach(inp); 480 } 481 482 void 483 in_pcbdetach(void *v) 484 { 485 struct inpcb *inp = v; 486 struct socket *so = inp->inp_socket; 487 int s; 488 489 if (inp->inp_af != AF_INET) 490 return; 491 492 #if defined(IPSEC) || defined(FAST_IPSEC) 493 ipsec4_delete_pcbpolicy(inp); 494 #endif /*IPSEC*/ 495 so->so_pcb = 0; 496 sofree(so); 497 if (inp->inp_options) 498 (void)m_free(inp->inp_options); 499 rtcache_free(&inp->inp_route); 500 ip_freemoptions(inp->inp_moptions); 501 s = splnet(); 502 in_pcbstate(inp, INP_ATTACHED); 503 LIST_REMOVE(&inp->inp_head, inph_lhash); 504 CIRCLEQ_REMOVE(&inp->inp_table->inpt_queue, &inp->inp_head, 505 inph_queue); 506 pool_put(&inpcb_pool, inp); 507 splx(s); 508 } 509 510 void 511 in_setsockaddr(struct inpcb *inp, struct mbuf *nam) 512 { 513 struct sockaddr_in *sin; 514 515 if (inp->inp_af != AF_INET) 516 return; 517 518 sin = mtod(nam, struct sockaddr_in *); 519 sockaddr_in_init(sin, &inp->inp_laddr, inp->inp_lport); 520 nam->m_len = sin->sin_len; 521 } 522 523 void 524 in_setpeeraddr(struct inpcb *inp, struct mbuf *nam) 525 { 526 struct sockaddr_in *sin; 527 528 if (inp->inp_af != AF_INET) 529 return; 530 531 sin = mtod(nam, struct sockaddr_in *); 532 sockaddr_in_init(sin, &inp->inp_faddr, inp->inp_fport); 533 nam->m_len = sin->sin_len; 534 } 535 536 /* 537 * Pass some notification to all connections of a protocol 538 * associated with address dst. The local address and/or port numbers 539 * may be specified to limit the search. The "usual action" will be 540 * taken, depending on the ctlinput cmd. The caller must filter any 541 * cmds that are uninteresting (e.g., no error in the map). 542 * Call the protocol specific routine (if any) to report 543 * any errors for each matching socket. 544 * 545 * Must be called at splsoftnet. 546 */ 547 int 548 in_pcbnotify(struct inpcbtable *table, struct in_addr faddr, u_int fport_arg, 549 struct in_addr laddr, u_int lport_arg, int errno, 550 void (*notify)(struct inpcb *, int)) 551 { 552 struct inpcbhead *head; 553 struct inpcb *inp, *ninp; 554 u_int16_t fport = fport_arg, lport = lport_arg; 555 int nmatch; 556 557 if (in_nullhost(faddr) || notify == 0) 558 return (0); 559 560 nmatch = 0; 561 head = INPCBHASH_CONNECT(table, faddr, fport, laddr, lport); 562 for (inp = (struct inpcb *)LIST_FIRST(head); inp != NULL; inp = ninp) { 563 ninp = (struct inpcb *)LIST_NEXT(inp, inp_hash); 564 if (inp->inp_af != AF_INET) 565 continue; 566 if (in_hosteq(inp->inp_faddr, faddr) && 567 inp->inp_fport == fport && 568 inp->inp_lport == lport && 569 in_hosteq(inp->inp_laddr, laddr)) { 570 (*notify)(inp, errno); 571 nmatch++; 572 } 573 } 574 return (nmatch); 575 } 576 577 void 578 in_pcbnotifyall(struct inpcbtable *table, struct in_addr faddr, int errno, 579 void (*notify)(struct inpcb *, int)) 580 { 581 struct inpcb *inp, *ninp; 582 583 if (in_nullhost(faddr) || notify == 0) 584 return; 585 586 for (inp = (struct inpcb *)CIRCLEQ_FIRST(&table->inpt_queue); 587 inp != (void *)&table->inpt_queue; 588 inp = ninp) { 589 ninp = (struct inpcb *)CIRCLEQ_NEXT(inp, inp_queue); 590 if (inp->inp_af != AF_INET) 591 continue; 592 if (in_hosteq(inp->inp_faddr, faddr)) 593 (*notify)(inp, errno); 594 } 595 } 596 597 void 598 in_pcbpurgeif0(struct inpcbtable *table, struct ifnet *ifp) 599 { 600 struct inpcb *inp, *ninp; 601 struct ip_moptions *imo; 602 int i, gap; 603 604 for (inp = (struct inpcb *)CIRCLEQ_FIRST(&table->inpt_queue); 605 inp != (void *)&table->inpt_queue; 606 inp = ninp) { 607 ninp = (struct inpcb *)CIRCLEQ_NEXT(inp, inp_queue); 608 if (inp->inp_af != AF_INET) 609 continue; 610 imo = inp->inp_moptions; 611 if (imo != NULL) { 612 /* 613 * Unselect the outgoing interface if it is being 614 * detached. 615 */ 616 if (imo->imo_multicast_ifp == ifp) 617 imo->imo_multicast_ifp = NULL; 618 619 /* 620 * Drop multicast group membership if we joined 621 * through the interface being detached. 622 */ 623 for (i = 0, gap = 0; i < imo->imo_num_memberships; 624 i++) { 625 if (imo->imo_membership[i]->inm_ifp == ifp) { 626 in_delmulti(imo->imo_membership[i]); 627 gap++; 628 } else if (gap != 0) 629 imo->imo_membership[i - gap] = 630 imo->imo_membership[i]; 631 } 632 imo->imo_num_memberships -= gap; 633 } 634 } 635 } 636 637 void 638 in_pcbpurgeif(struct inpcbtable *table, struct ifnet *ifp) 639 { 640 struct inpcb *inp, *ninp; 641 642 for (inp = (struct inpcb *)CIRCLEQ_FIRST(&table->inpt_queue); 643 inp != (void *)&table->inpt_queue; 644 inp = ninp) { 645 ninp = (struct inpcb *)CIRCLEQ_NEXT(inp, inp_queue); 646 if (inp->inp_af != AF_INET) 647 continue; 648 if (inp->inp_route.ro_rt != NULL && 649 inp->inp_route.ro_rt->rt_ifp == ifp) 650 in_rtchange(inp, 0); 651 } 652 } 653 654 /* 655 * Check for alternatives when higher level complains 656 * about service problems. For now, invalidate cached 657 * routing information. If the route was created dynamically 658 * (by a redirect), time to try a default gateway again. 659 */ 660 void 661 in_losing(struct inpcb *inp) 662 { 663 struct rtentry *rt; 664 struct rt_addrinfo info; 665 666 if (inp->inp_af != AF_INET) 667 return; 668 669 if ((rt = inp->inp_route.ro_rt) != NULL) { 670 memset(&info, 0, sizeof(info)); 671 info.rti_info[RTAX_DST] = rtcache_getdst(&inp->inp_route); 672 info.rti_info[RTAX_GATEWAY] = rt->rt_gateway; 673 info.rti_info[RTAX_NETMASK] = rt_mask(rt); 674 rt_missmsg(RTM_LOSING, &info, rt->rt_flags, 0); 675 if (rt->rt_flags & RTF_DYNAMIC) 676 (void) rtrequest(RTM_DELETE, rt_getkey(rt), 677 rt->rt_gateway, rt_mask(rt), rt->rt_flags, 678 NULL); 679 /* 680 * A new route can be allocated 681 * the next time output is attempted. 682 */ 683 rtcache_free(&inp->inp_route); 684 } 685 } 686 687 /* 688 * After a routing change, flush old routing. A new route can be 689 * allocated the next time output is attempted. 690 */ 691 void 692 in_rtchange(struct inpcb *inp, int errno) 693 { 694 695 if (inp->inp_af != AF_INET) 696 return; 697 698 rtcache_free(&inp->inp_route); 699 700 /* XXX SHOULD NOTIFY HIGHER-LEVEL PROTOCOLS */ 701 } 702 703 struct inpcb * 704 in_pcblookup_port(struct inpcbtable *table, struct in_addr laddr, 705 u_int lport_arg, int lookup_wildcard) 706 { 707 struct inpcbhead *head; 708 struct inpcb_hdr *inph; 709 struct inpcb *inp, *match = 0; 710 int matchwild = 3, wildcard; 711 u_int16_t lport = lport_arg; 712 713 head = INPCBHASH_PORT(table, lport); 714 LIST_FOREACH(inph, head, inph_lhash) { 715 inp = (struct inpcb *)inph; 716 if (inp->inp_af != AF_INET) 717 continue; 718 719 if (inp->inp_lport != lport) 720 continue; 721 wildcard = 0; 722 if (!in_nullhost(inp->inp_faddr)) 723 wildcard++; 724 if (in_nullhost(inp->inp_laddr)) { 725 if (!in_nullhost(laddr)) 726 wildcard++; 727 } else { 728 if (in_nullhost(laddr)) 729 wildcard++; 730 else { 731 if (!in_hosteq(inp->inp_laddr, laddr)) 732 continue; 733 } 734 } 735 if (wildcard && !lookup_wildcard) 736 continue; 737 if (wildcard < matchwild) { 738 match = inp; 739 matchwild = wildcard; 740 if (matchwild == 0) 741 break; 742 } 743 } 744 return (match); 745 } 746 747 #ifdef DIAGNOSTIC 748 int in_pcbnotifymiss = 0; 749 #endif 750 751 struct inpcb * 752 in_pcblookup_connect(struct inpcbtable *table, 753 struct in_addr faddr, u_int fport_arg, 754 struct in_addr laddr, u_int lport_arg) 755 { 756 struct inpcbhead *head; 757 struct inpcb_hdr *inph; 758 struct inpcb *inp; 759 u_int16_t fport = fport_arg, lport = lport_arg; 760 761 head = INPCBHASH_CONNECT(table, faddr, fport, laddr, lport); 762 LIST_FOREACH(inph, head, inph_hash) { 763 inp = (struct inpcb *)inph; 764 if (inp->inp_af != AF_INET) 765 continue; 766 767 if (in_hosteq(inp->inp_faddr, faddr) && 768 inp->inp_fport == fport && 769 inp->inp_lport == lport && 770 in_hosteq(inp->inp_laddr, laddr)) 771 goto out; 772 } 773 #ifdef DIAGNOSTIC 774 if (in_pcbnotifymiss) { 775 printf("in_pcblookup_connect: faddr=%08x fport=%d laddr=%08x lport=%d\n", 776 ntohl(faddr.s_addr), ntohs(fport), 777 ntohl(laddr.s_addr), ntohs(lport)); 778 } 779 #endif 780 return (0); 781 782 out: 783 /* Move this PCB to the head of hash chain. */ 784 inph = &inp->inp_head; 785 if (inph != LIST_FIRST(head)) { 786 LIST_REMOVE(inph, inph_hash); 787 LIST_INSERT_HEAD(head, inph, inph_hash); 788 } 789 return (inp); 790 } 791 792 struct inpcb * 793 in_pcblookup_bind(struct inpcbtable *table, 794 struct in_addr laddr, u_int lport_arg) 795 { 796 struct inpcbhead *head; 797 struct inpcb_hdr *inph; 798 struct inpcb *inp; 799 u_int16_t lport = lport_arg; 800 801 head = INPCBHASH_BIND(table, laddr, lport); 802 LIST_FOREACH(inph, head, inph_hash) { 803 inp = (struct inpcb *)inph; 804 if (inp->inp_af != AF_INET) 805 continue; 806 807 if (inp->inp_lport == lport && 808 in_hosteq(inp->inp_laddr, laddr)) 809 goto out; 810 } 811 head = INPCBHASH_BIND(table, zeroin_addr, lport); 812 LIST_FOREACH(inph, head, inph_hash) { 813 inp = (struct inpcb *)inph; 814 if (inp->inp_af != AF_INET) 815 continue; 816 817 if (inp->inp_lport == lport && 818 in_hosteq(inp->inp_laddr, zeroin_addr)) 819 goto out; 820 } 821 #ifdef DIAGNOSTIC 822 if (in_pcbnotifymiss) { 823 printf("in_pcblookup_bind: laddr=%08x lport=%d\n", 824 ntohl(laddr.s_addr), ntohs(lport)); 825 } 826 #endif 827 return (0); 828 829 out: 830 /* Move this PCB to the head of hash chain. */ 831 inph = &inp->inp_head; 832 if (inph != LIST_FIRST(head)) { 833 LIST_REMOVE(inph, inph_hash); 834 LIST_INSERT_HEAD(head, inph, inph_hash); 835 } 836 return (inp); 837 } 838 839 void 840 in_pcbstate(struct inpcb *inp, int state) 841 { 842 843 if (inp->inp_af != AF_INET) 844 return; 845 846 if (inp->inp_state > INP_ATTACHED) 847 LIST_REMOVE(&inp->inp_head, inph_hash); 848 849 switch (state) { 850 case INP_BOUND: 851 LIST_INSERT_HEAD(INPCBHASH_BIND(inp->inp_table, 852 inp->inp_laddr, inp->inp_lport), &inp->inp_head, 853 inph_hash); 854 break; 855 case INP_CONNECTED: 856 LIST_INSERT_HEAD(INPCBHASH_CONNECT(inp->inp_table, 857 inp->inp_faddr, inp->inp_fport, 858 inp->inp_laddr, inp->inp_lport), &inp->inp_head, 859 inph_hash); 860 break; 861 } 862 863 inp->inp_state = state; 864 } 865 866 struct rtentry * 867 in_pcbrtentry(struct inpcb *inp) 868 { 869 struct route *ro; 870 union { 871 struct sockaddr dst; 872 struct sockaddr_in dst4; 873 } u; 874 875 if (inp->inp_af != AF_INET) 876 return (NULL); 877 878 ro = &inp->inp_route; 879 880 sockaddr_in_init(&u.dst4, &inp->inp_faddr, 0); 881 return rtcache_lookup(ro, &u.dst); 882 } 883 884 struct sockaddr_in * 885 in_selectsrc(struct sockaddr_in *sin, struct route *ro, 886 int soopts, struct ip_moptions *mopts, int *errorp) 887 { 888 struct in_ifaddr *ia = NULL; 889 890 /* 891 * If route is known or can be allocated now, take the 892 * source address from the interface. Otherwise, punt. 893 */ 894 if ((soopts & SO_DONTROUTE) != 0) 895 rtcache_free(ro); 896 else { 897 union { 898 struct sockaddr dst; 899 struct sockaddr_in dst4; 900 } u; 901 902 sockaddr_in_init(&u.dst4, &sin->sin_addr, 0); 903 (void)rtcache_lookup(ro, &u.dst); 904 } 905 /* 906 * If we found a route, use the address 907 * corresponding to the outgoing interface 908 * unless it is the loopback (in case a route 909 * to our address on another net goes to loopback). 910 * 911 * XXX Is this still true? Do we care? 912 */ 913 if (ro->ro_rt != NULL && !(ro->ro_rt->rt_ifp->if_flags & IFF_LOOPBACK)) 914 ia = ifatoia(ro->ro_rt->rt_ifa); 915 if (ia == NULL) { 916 u_int16_t fport = sin->sin_port; 917 918 sin->sin_port = 0; 919 ia = ifatoia(ifa_ifwithladdr(sintosa(sin))); 920 sin->sin_port = fport; 921 if (ia == NULL) { 922 /* Find 1st non-loopback AF_INET address */ 923 TAILQ_FOREACH(ia, &in_ifaddrhead, ia_list) { 924 if (!(ia->ia_ifp->if_flags & IFF_LOOPBACK)) 925 break; 926 } 927 } 928 if (ia == NULL) { 929 *errorp = EADDRNOTAVAIL; 930 return NULL; 931 } 932 } 933 /* 934 * If the destination address is multicast and an outgoing 935 * interface has been set as a multicast option, use the 936 * address of that interface as our source address. 937 */ 938 if (IN_MULTICAST(sin->sin_addr.s_addr) && mopts != NULL) { 939 struct ip_moptions *imo; 940 struct ifnet *ifp; 941 942 imo = mopts; 943 if (imo->imo_multicast_ifp != NULL) { 944 ifp = imo->imo_multicast_ifp; 945 IFP_TO_IA(ifp, ia); /* XXX */ 946 if (ia == 0) { 947 *errorp = EADDRNOTAVAIL; 948 return NULL; 949 } 950 } 951 } 952 if (ia->ia_ifa.ifa_getifa != NULL) { 953 ia = ifatoia((*ia->ia_ifa.ifa_getifa)(&ia->ia_ifa, 954 sintosa(sin))); 955 } 956 #ifdef GETIFA_DEBUG 957 else 958 printf("%s: missing ifa_getifa\n", __func__); 959 #endif 960 return satosin(&ia->ia_addr); 961 } 962
Indexes created Sun Sep 21 20:09:37 GMT 2025