in_pcb.c revision 1.105
1 /* $NetBSD: in_pcb.c,v 1.105 2006/09/19 21:42:30 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 1.105 2006/09/19 21:42:30 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); 162 163 void 164 in_pcbinit(struct inpcbtable *table, int bindhashsize, int connecthashsize) 165 { 166 167 CIRCLEQ_INIT(&table->inpt_queue); 168 table->inpt_porthashtbl = hashinit(bindhashsize, HASH_LIST, M_PCB, 169 M_WAITOK, &table->inpt_porthash); 170 table->inpt_bindhashtbl = hashinit(bindhashsize, HASH_LIST, M_PCB, 171 M_WAITOK, &table->inpt_bindhash); 172 table->inpt_connecthashtbl = hashinit(connecthashsize, HASH_LIST, 173 M_PCB, M_WAITOK, &table->inpt_connecthash); 174 table->inpt_lastlow = IPPORT_RESERVEDMAX; 175 table->inpt_lastport = (u_int16_t)anonportmax; 176 } 177 178 int 179 in_pcballoc(struct socket *so, void *v) 180 { 181 struct inpcbtable *table = v; 182 struct inpcb *inp; 183 int s; 184 #if defined(IPSEC) || defined(FAST_IPSEC) 185 int error; 186 #endif 187 188 inp = pool_get(&inpcb_pool, PR_NOWAIT); 189 if (inp == NULL) 190 return (ENOBUFS); 191 bzero((caddr_t)inp, sizeof(*inp)); 192 inp->inp_af = AF_INET; 193 inp->inp_table = table; 194 inp->inp_socket = so; 195 inp->inp_errormtu = -1; 196 #if defined(IPSEC) || defined(FAST_IPSEC) 197 error = ipsec_init_pcbpolicy(so, &inp->inp_sp); 198 if (error != 0) { 199 pool_put(&inpcb_pool, inp); 200 return error; 201 } 202 #endif 203 so->so_pcb = inp; 204 s = splnet(); 205 CIRCLEQ_INSERT_HEAD(&table->inpt_queue, &inp->inp_head, 206 inph_queue); 207 LIST_INSERT_HEAD(INPCBHASH_PORT(table, inp->inp_lport), &inp->inp_head, 208 inph_lhash); 209 in_pcbstate(inp, INP_ATTACHED); 210 splx(s); 211 return (0); 212 } 213 214 int 215 in_pcbbind(void *v, struct mbuf *nam, struct lwp *l) 216 { 217 struct in_ifaddr *ia = NULL; 218 struct inpcb *inp = v; 219 struct socket *so = inp->inp_socket; 220 struct inpcbtable *table = inp->inp_table; 221 struct sockaddr_in *sin = NULL; /* XXXGCC */ 222 u_int16_t lport = 0; 223 int wild = 0, reuseport = (so->so_options & SO_REUSEPORT); 224 225 if (inp->inp_af != AF_INET) 226 return (EINVAL); 227 228 if (TAILQ_FIRST(&in_ifaddrhead) == 0) 229 return (EADDRNOTAVAIL); 230 if (inp->inp_lport || !in_nullhost(inp->inp_laddr)) 231 return (EINVAL); 232 if ((so->so_options & (SO_REUSEADDR|SO_REUSEPORT)) == 0) 233 wild = 1; 234 if (nam == 0) 235 goto noname; 236 sin = mtod(nam, struct sockaddr_in *); 237 if (nam->m_len != sizeof (*sin)) 238 return (EINVAL); 239 if (sin->sin_family != AF_INET) 240 return (EAFNOSUPPORT); 241 lport = sin->sin_port; 242 if (IN_MULTICAST(sin->sin_addr.s_addr)) { 243 /* 244 * Treat SO_REUSEADDR as SO_REUSEPORT for multicast; 245 * allow complete duplication of binding if 246 * SO_REUSEPORT is set, or if SO_REUSEADDR is set 247 * and a multicast address is bound on both 248 * new and duplicated sockets. 249 */ 250 if (so->so_options & SO_REUSEADDR) 251 reuseport = SO_REUSEADDR|SO_REUSEPORT; 252 } else if (!in_nullhost(sin->sin_addr)) { 253 sin->sin_port = 0; /* yech... */ 254 INADDR_TO_IA(sin->sin_addr, ia); 255 /* check for broadcast addresses */ 256 if (ia == NULL) 257 ia = ifatoia(ifa_ifwithaddr(sintosa(sin))); 258 if (ia == NULL) 259 return (EADDRNOTAVAIL); 260 } 261 if (lport) { 262 struct inpcb *t; 263 #ifdef INET6 264 struct in6pcb *t6; 265 struct in6_addr mapped; 266 #endif 267 #ifndef IPNOPRIVPORTS 268 /* GROSS */ 269 if (ntohs(lport) < IPPORT_RESERVED && 270 (l == 0 || kauth_authorize_network(l->l_cred, 271 KAUTH_NETWORK_BIND, 272 KAUTH_REQ_NETWORK_BIND_PRIVPORT, so, sin, 273 NULL))) 274 return (EACCES); 275 #endif 276 #ifdef INET6 277 memset(&mapped, 0, sizeof(mapped)); 278 mapped.s6_addr16[5] = 0xffff; 279 memcpy(&mapped.s6_addr32[3], &sin->sin_addr, 280 sizeof(mapped.s6_addr32[3])); 281 t6 = in6_pcblookup_port(table, &mapped, lport, wild); 282 if (t6 && (reuseport & t6->in6p_socket->so_options) == 0) 283 return (EADDRINUSE); 284 #endif 285 if (so->so_uidinfo->ui_uid && !IN_MULTICAST(sin->sin_addr.s_addr)) { 286 t = in_pcblookup_port(table, sin->sin_addr, lport, 1); 287 /* 288 * XXX: investigate ramifications of loosening this 289 * restriction so that as long as both ports have 290 * SO_REUSEPORT allow the bind 291 */ 292 if (t && 293 (!in_nullhost(sin->sin_addr) || 294 !in_nullhost(t->inp_laddr) || 295 (t->inp_socket->so_options & SO_REUSEPORT) == 0) 296 && (so->so_uidinfo->ui_uid != t->inp_socket->so_uidinfo->ui_uid)) { 297 return (EADDRINUSE); 298 } 299 } 300 t = in_pcblookup_port(table, sin->sin_addr, lport, wild); 301 if (t && (reuseport & t->inp_socket->so_options) == 0) 302 return (EADDRINUSE); 303 } 304 inp->inp_laddr = sin->sin_addr; 305 306 noname: 307 if (lport == 0) { 308 int cnt; 309 u_int16_t mymin, mymax; 310 u_int16_t *lastport; 311 312 if (inp->inp_flags & INP_LOWPORT) { 313 #ifndef IPNOPRIVPORTS 314 if (l == 0 || kauth_authorize_network(l->l_cred, 315 KAUTH_NETWORK_BIND, 316 KAUTH_REQ_NETWORK_BIND_PRIVPORT, so, 317 sin, NULL)) 318 return (EACCES); 319 #endif 320 mymin = lowportmin; 321 mymax = lowportmax; 322 lastport = &table->inpt_lastlow; 323 } else { 324 mymin = anonportmin; 325 mymax = anonportmax; 326 lastport = &table->inpt_lastport; 327 } 328 if (mymin > mymax) { /* sanity check */ 329 u_int16_t swp; 330 331 swp = mymin; 332 mymin = mymax; 333 mymax = swp; 334 } 335 336 lport = *lastport - 1; 337 for (cnt = mymax - mymin + 1; cnt; cnt--, lport--) { 338 if (lport < mymin || lport > mymax) 339 lport = mymax; 340 if (!in_pcblookup_port(table, inp->inp_laddr, 341 htons(lport), 1)) 342 goto found; 343 } 344 if (!in_nullhost(inp->inp_laddr)) 345 inp->inp_laddr.s_addr = INADDR_ANY; 346 return (EAGAIN); 347 found: 348 inp->inp_flags |= INP_ANONPORT; 349 *lastport = lport; 350 lport = htons(lport); 351 } 352 inp->inp_lport = lport; 353 LIST_REMOVE(&inp->inp_head, inph_lhash); 354 LIST_INSERT_HEAD(INPCBHASH_PORT(table, inp->inp_lport), &inp->inp_head, 355 inph_lhash); 356 in_pcbstate(inp, INP_BOUND); 357 return (0); 358 } 359 360 /* 361 * Connect from a socket to a specified address. 362 * Both address and port must be specified in argument sin. 363 * If don't have a local address for this socket yet, 364 * then pick one. 365 */ 366 int 367 in_pcbconnect(void *v, struct mbuf *nam, struct lwp *l) 368 { 369 struct inpcb *inp = v; 370 struct in_ifaddr *ia = NULL; 371 struct sockaddr_in *ifaddr = NULL; 372 struct sockaddr_in *sin = mtod(nam, struct sockaddr_in *); 373 int error; 374 375 if (inp->inp_af != AF_INET) 376 return (EINVAL); 377 378 if (nam->m_len != sizeof (*sin)) 379 return (EINVAL); 380 if (sin->sin_family != AF_INET) 381 return (EAFNOSUPPORT); 382 if (sin->sin_port == 0) 383 return (EADDRNOTAVAIL); 384 if (TAILQ_FIRST(&in_ifaddrhead) != 0) { 385 /* 386 * If the destination address is INADDR_ANY, 387 * use any local address (likely loopback). 388 * If the supplied address is INADDR_BROADCAST, 389 * use the broadcast address of an interface 390 * which supports broadcast. (loopback does not) 391 */ 392 393 if (in_nullhost(sin->sin_addr)) { 394 sin->sin_addr = 395 TAILQ_FIRST(&in_ifaddrhead)->ia_addr.sin_addr; 396 } else if (sin->sin_addr.s_addr == INADDR_BROADCAST) { 397 TAILQ_FOREACH(ia, &in_ifaddrhead, ia_list) { 398 if (ia->ia_ifp->if_flags & IFF_BROADCAST) { 399 sin->sin_addr = 400 ia->ia_broadaddr.sin_addr; 401 break; 402 } 403 } 404 } 405 } 406 /* 407 * If we haven't bound which network number to use as ours, 408 * we will use the number of the outgoing interface. 409 * This depends on having done a routing lookup, which 410 * we will probably have to do anyway, so we might 411 * as well do it now. On the other hand if we are 412 * sending to multiple destinations we may have already 413 * done the lookup, so see if we can use the route 414 * from before. In any case, we only 415 * chose a port number once, even if sending to multiple 416 * destinations. 417 */ 418 if (in_nullhost(inp->inp_laddr)) { 419 int xerror; 420 ifaddr = in_selectsrc(sin, &inp->inp_route, 421 inp->inp_socket->so_options, inp->inp_moptions, &xerror); 422 if (ifaddr == NULL) { 423 if (xerror == 0) 424 xerror = EADDRNOTAVAIL; 425 return xerror; 426 } 427 INADDR_TO_IA(ifaddr->sin_addr, ia); 428 if (ia == NULL) 429 return (EADDRNOTAVAIL); 430 } 431 if (in_pcblookup_connect(inp->inp_table, sin->sin_addr, sin->sin_port, 432 !in_nullhost(inp->inp_laddr) ? inp->inp_laddr : ifaddr->sin_addr, 433 inp->inp_lport) != 0) 434 return (EADDRINUSE); 435 if (in_nullhost(inp->inp_laddr)) { 436 if (inp->inp_lport == 0) { 437 error = in_pcbbind(inp, NULL, l); 438 /* 439 * This used to ignore the return value 440 * completely, but we need to check for 441 * ephemeral port shortage. 442 * And attempts to request low ports if not root. 443 */ 444 if (error != 0) 445 return (error); 446 } 447 inp->inp_laddr = ifaddr->sin_addr; 448 } 449 inp->inp_faddr = sin->sin_addr; 450 inp->inp_fport = sin->sin_port; 451 in_pcbstate(inp, INP_CONNECTED); 452 #if defined(IPSEC) || defined(FAST_IPSEC) 453 if (inp->inp_socket->so_type == SOCK_STREAM) 454 ipsec_pcbconn(inp->inp_sp); 455 #endif 456 return (0); 457 } 458 459 void 460 in_pcbdisconnect(void *v) 461 { 462 struct inpcb *inp = v; 463 464 if (inp->inp_af != AF_INET) 465 return; 466 467 inp->inp_faddr = zeroin_addr; 468 inp->inp_fport = 0; 469 in_pcbstate(inp, INP_BOUND); 470 #if defined(IPSEC) || defined(FAST_IPSEC) 471 ipsec_pcbdisconn(inp->inp_sp); 472 #endif 473 if (inp->inp_socket->so_state & SS_NOFDREF) 474 in_pcbdetach(inp); 475 } 476 477 void 478 in_pcbdetach(void *v) 479 { 480 struct inpcb *inp = v; 481 struct socket *so = inp->inp_socket; 482 int s; 483 484 if (inp->inp_af != AF_INET) 485 return; 486 487 #if defined(IPSEC) || defined(FAST_IPSEC) 488 ipsec4_delete_pcbpolicy(inp); 489 #endif /*IPSEC*/ 490 so->so_pcb = 0; 491 sofree(so); 492 if (inp->inp_options) 493 (void)m_free(inp->inp_options); 494 if (inp->inp_route.ro_rt) 495 rtfree(inp->inp_route.ro_rt); 496 ip_freemoptions(inp->inp_moptions); 497 s = splnet(); 498 in_pcbstate(inp, INP_ATTACHED); 499 LIST_REMOVE(&inp->inp_head, inph_lhash); 500 CIRCLEQ_REMOVE(&inp->inp_table->inpt_queue, &inp->inp_head, 501 inph_queue); 502 splx(s); 503 pool_put(&inpcb_pool, inp); 504 } 505 506 void 507 in_setsockaddr(struct inpcb *inp, struct mbuf *nam) 508 { 509 struct sockaddr_in *sin; 510 511 if (inp->inp_af != AF_INET) 512 return; 513 514 nam->m_len = sizeof (*sin); 515 sin = mtod(nam, struct sockaddr_in *); 516 bzero((caddr_t)sin, sizeof (*sin)); 517 sin->sin_family = AF_INET; 518 sin->sin_len = sizeof(*sin); 519 sin->sin_port = inp->inp_lport; 520 sin->sin_addr = inp->inp_laddr; 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 nam->m_len = sizeof (*sin); 532 sin = mtod(nam, struct sockaddr_in *); 533 bzero((caddr_t)sin, sizeof (*sin)); 534 sin->sin_family = AF_INET; 535 sin->sin_len = sizeof(*sin); 536 sin->sin_port = inp->inp_fport; 537 sin->sin_addr = inp->inp_faddr; 538 } 539 540 /* 541 * Pass some notification to all connections of a protocol 542 * associated with address dst. The local address and/or port numbers 543 * may be specified to limit the search. The "usual action" will be 544 * taken, depending on the ctlinput cmd. The caller must filter any 545 * cmds that are uninteresting (e.g., no error in the map). 546 * Call the protocol specific routine (if any) to report 547 * any errors for each matching socket. 548 * 549 * Must be called at splsoftnet. 550 */ 551 int 552 in_pcbnotify(struct inpcbtable *table, struct in_addr faddr, u_int fport_arg, 553 struct in_addr laddr, u_int lport_arg, int errno, 554 void (*notify)(struct inpcb *, int)) 555 { 556 struct inpcbhead *head; 557 struct inpcb *inp, *ninp; 558 u_int16_t fport = fport_arg, lport = lport_arg; 559 int nmatch; 560 561 if (in_nullhost(faddr) || notify == 0) 562 return (0); 563 564 nmatch = 0; 565 head = INPCBHASH_CONNECT(table, faddr, fport, laddr, lport); 566 for (inp = (struct inpcb *)LIST_FIRST(head); inp != NULL; inp = ninp) { 567 ninp = (struct inpcb *)LIST_NEXT(inp, inp_hash); 568 if (inp->inp_af != AF_INET) 569 continue; 570 if (in_hosteq(inp->inp_faddr, faddr) && 571 inp->inp_fport == fport && 572 inp->inp_lport == lport && 573 in_hosteq(inp->inp_laddr, laddr)) { 574 (*notify)(inp, errno); 575 nmatch++; 576 } 577 } 578 return (nmatch); 579 } 580 581 void 582 in_pcbnotifyall(struct inpcbtable *table, struct in_addr faddr, int errno, 583 void (*notify)(struct inpcb *, int)) 584 { 585 struct inpcb *inp, *ninp; 586 587 if (in_nullhost(faddr) || notify == 0) 588 return; 589 590 for (inp = (struct inpcb *)CIRCLEQ_FIRST(&table->inpt_queue); 591 inp != (void *)&table->inpt_queue; 592 inp = ninp) { 593 ninp = (struct inpcb *)CIRCLEQ_NEXT(inp, inp_queue); 594 if (inp->inp_af != AF_INET) 595 continue; 596 if (in_hosteq(inp->inp_faddr, faddr)) 597 (*notify)(inp, errno); 598 } 599 } 600 601 void 602 in_pcbpurgeif0(struct inpcbtable *table, struct ifnet *ifp) 603 { 604 struct inpcb *inp, *ninp; 605 struct ip_moptions *imo; 606 int i, gap; 607 608 for (inp = (struct inpcb *)CIRCLEQ_FIRST(&table->inpt_queue); 609 inp != (void *)&table->inpt_queue; 610 inp = ninp) { 611 ninp = (struct inpcb *)CIRCLEQ_NEXT(inp, inp_queue); 612 if (inp->inp_af != AF_INET) 613 continue; 614 imo = inp->inp_moptions; 615 if (imo != NULL) { 616 /* 617 * Unselect the outgoing interface if it is being 618 * detached. 619 */ 620 if (imo->imo_multicast_ifp == ifp) 621 imo->imo_multicast_ifp = NULL; 622 623 /* 624 * Drop multicast group membership if we joined 625 * through the interface being detached. 626 */ 627 for (i = 0, gap = 0; i < imo->imo_num_memberships; 628 i++) { 629 if (imo->imo_membership[i]->inm_ifp == ifp) { 630 in_delmulti(imo->imo_membership[i]); 631 gap++; 632 } else if (gap != 0) 633 imo->imo_membership[i - gap] = 634 imo->imo_membership[i]; 635 } 636 imo->imo_num_memberships -= gap; 637 } 638 } 639 } 640 641 void 642 in_pcbpurgeif(struct inpcbtable *table, struct ifnet *ifp) 643 { 644 struct inpcb *inp, *ninp; 645 646 for (inp = (struct inpcb *)CIRCLEQ_FIRST(&table->inpt_queue); 647 inp != (void *)&table->inpt_queue; 648 inp = ninp) { 649 ninp = (struct inpcb *)CIRCLEQ_NEXT(inp, inp_queue); 650 if (inp->inp_af != AF_INET) 651 continue; 652 if (inp->inp_route.ro_rt != NULL && 653 inp->inp_route.ro_rt->rt_ifp == ifp) 654 in_rtchange(inp, 0); 655 } 656 } 657 658 /* 659 * Check for alternatives when higher level complains 660 * about service problems. For now, invalidate cached 661 * routing information. If the route was created dynamically 662 * (by a redirect), time to try a default gateway again. 663 */ 664 void 665 in_losing(struct inpcb *inp) 666 { 667 struct rtentry *rt; 668 struct rt_addrinfo info; 669 670 if (inp->inp_af != AF_INET) 671 return; 672 673 if ((rt = inp->inp_route.ro_rt)) { 674 inp->inp_route.ro_rt = 0; 675 bzero((caddr_t)&info, sizeof(info)); 676 info.rti_info[RTAX_DST] = &inp->inp_route.ro_dst; 677 info.rti_info[RTAX_GATEWAY] = rt->rt_gateway; 678 info.rti_info[RTAX_NETMASK] = rt_mask(rt); 679 rt_missmsg(RTM_LOSING, &info, rt->rt_flags, 0); 680 if (rt->rt_flags & RTF_DYNAMIC) 681 (void) rtrequest(RTM_DELETE, rt_key(rt), 682 rt->rt_gateway, rt_mask(rt), rt->rt_flags, 683 (struct rtentry **)0); 684 else 685 /* 686 * A new route can be allocated 687 * the next time output is attempted. 688 */ 689 rtfree(rt); 690 } 691 } 692 693 /* 694 * After a routing change, flush old routing 695 * and allocate a (hopefully) better one. 696 */ 697 void 698 in_rtchange(struct inpcb *inp, int errno) 699 { 700 701 if (inp->inp_af != AF_INET) 702 return; 703 704 if (inp->inp_route.ro_rt) { 705 rtfree(inp->inp_route.ro_rt); 706 inp->inp_route.ro_rt = 0; 707 /* 708 * A new route can be allocated the next time 709 * output is attempted. 710 */ 711 } 712 /* XXX SHOULD NOTIFY HIGHER-LEVEL PROTOCOLS */ 713 } 714 715 struct inpcb * 716 in_pcblookup_port(struct inpcbtable *table, struct in_addr laddr, 717 u_int lport_arg, int lookup_wildcard) 718 { 719 struct inpcbhead *head; 720 struct inpcb_hdr *inph; 721 struct inpcb *inp, *match = 0; 722 int matchwild = 3, wildcard; 723 u_int16_t lport = lport_arg; 724 725 head = INPCBHASH_PORT(table, lport); 726 LIST_FOREACH(inph, head, inph_lhash) { 727 inp = (struct inpcb *)inph; 728 if (inp->inp_af != AF_INET) 729 continue; 730 731 if (inp->inp_lport != lport) 732 continue; 733 wildcard = 0; 734 if (!in_nullhost(inp->inp_faddr)) 735 wildcard++; 736 if (in_nullhost(inp->inp_laddr)) { 737 if (!in_nullhost(laddr)) 738 wildcard++; 739 } else { 740 if (in_nullhost(laddr)) 741 wildcard++; 742 else { 743 if (!in_hosteq(inp->inp_laddr, laddr)) 744 continue; 745 } 746 } 747 if (wildcard && !lookup_wildcard) 748 continue; 749 if (wildcard < matchwild) { 750 match = inp; 751 matchwild = wildcard; 752 if (matchwild == 0) 753 break; 754 } 755 } 756 return (match); 757 } 758 759 #ifdef DIAGNOSTIC 760 int in_pcbnotifymiss = 0; 761 #endif 762 763 struct inpcb * 764 in_pcblookup_connect(struct inpcbtable *table, 765 struct in_addr faddr, u_int fport_arg, 766 struct in_addr laddr, u_int lport_arg) 767 { 768 struct inpcbhead *head; 769 struct inpcb_hdr *inph; 770 struct inpcb *inp; 771 u_int16_t fport = fport_arg, lport = lport_arg; 772 773 head = INPCBHASH_CONNECT(table, faddr, fport, laddr, lport); 774 LIST_FOREACH(inph, head, inph_hash) { 775 inp = (struct inpcb *)inph; 776 if (inp->inp_af != AF_INET) 777 continue; 778 779 if (in_hosteq(inp->inp_faddr, faddr) && 780 inp->inp_fport == fport && 781 inp->inp_lport == lport && 782 in_hosteq(inp->inp_laddr, laddr)) 783 goto out; 784 } 785 #ifdef DIAGNOSTIC 786 if (in_pcbnotifymiss) { 787 printf("in_pcblookup_connect: faddr=%08x fport=%d laddr=%08x lport=%d\n", 788 ntohl(faddr.s_addr), ntohs(fport), 789 ntohl(laddr.s_addr), ntohs(lport)); 790 } 791 #endif 792 return (0); 793 794 out: 795 /* Move this PCB to the head of hash chain. */ 796 inph = &inp->inp_head; 797 if (inph != LIST_FIRST(head)) { 798 LIST_REMOVE(inph, inph_hash); 799 LIST_INSERT_HEAD(head, inph, inph_hash); 800 } 801 return (inp); 802 } 803 804 struct inpcb * 805 in_pcblookup_bind(struct inpcbtable *table, 806 struct in_addr laddr, u_int lport_arg) 807 { 808 struct inpcbhead *head; 809 struct inpcb_hdr *inph; 810 struct inpcb *inp; 811 u_int16_t lport = lport_arg; 812 813 head = INPCBHASH_BIND(table, laddr, lport); 814 LIST_FOREACH(inph, head, inph_hash) { 815 inp = (struct inpcb *)inph; 816 if (inp->inp_af != AF_INET) 817 continue; 818 819 if (inp->inp_lport == lport && 820 in_hosteq(inp->inp_laddr, laddr)) 821 goto out; 822 } 823 head = INPCBHASH_BIND(table, zeroin_addr, lport); 824 LIST_FOREACH(inph, head, inph_hash) { 825 inp = (struct inpcb *)inph; 826 if (inp->inp_af != AF_INET) 827 continue; 828 829 if (inp->inp_lport == lport && 830 in_hosteq(inp->inp_laddr, zeroin_addr)) 831 goto out; 832 } 833 #ifdef DIAGNOSTIC 834 if (in_pcbnotifymiss) { 835 printf("in_pcblookup_bind: laddr=%08x lport=%d\n", 836 ntohl(laddr.s_addr), ntohs(lport)); 837 } 838 #endif 839 return (0); 840 841 out: 842 /* Move this PCB to the head of hash chain. */ 843 inph = &inp->inp_head; 844 if (inph != LIST_FIRST(head)) { 845 LIST_REMOVE(inph, inph_hash); 846 LIST_INSERT_HEAD(head, inph, inph_hash); 847 } 848 return (inp); 849 } 850 851 void 852 in_pcbstate(struct inpcb *inp, int state) 853 { 854 855 if (inp->inp_af != AF_INET) 856 return; 857 858 if (inp->inp_state > INP_ATTACHED) 859 LIST_REMOVE(&inp->inp_head, inph_hash); 860 861 switch (state) { 862 case INP_BOUND: 863 LIST_INSERT_HEAD(INPCBHASH_BIND(inp->inp_table, 864 inp->inp_laddr, inp->inp_lport), &inp->inp_head, 865 inph_hash); 866 break; 867 case INP_CONNECTED: 868 LIST_INSERT_HEAD(INPCBHASH_CONNECT(inp->inp_table, 869 inp->inp_faddr, inp->inp_fport, 870 inp->inp_laddr, inp->inp_lport), &inp->inp_head, 871 inph_hash); 872 break; 873 } 874 875 inp->inp_state = state; 876 } 877 878 struct rtentry * 879 in_pcbrtentry(struct inpcb *inp) 880 { 881 struct route *ro; 882 883 if (inp->inp_af != AF_INET) 884 return (NULL); 885 886 ro = &inp->inp_route; 887 888 if (ro->ro_rt && ((ro->ro_rt->rt_flags & RTF_UP) == 0 || 889 !in_hosteq(satosin(&ro->ro_dst)->sin_addr, inp->inp_faddr))) { 890 RTFREE(ro->ro_rt); 891 ro->ro_rt = (struct rtentry *)NULL; 892 } 893 if (ro->ro_rt == (struct rtentry *)NULL && 894 !in_nullhost(inp->inp_faddr)) { 895 bzero(&ro->ro_dst, sizeof(struct sockaddr_in)); 896 ro->ro_dst.sa_family = AF_INET; 897 ro->ro_dst.sa_len = sizeof(ro->ro_dst); 898 satosin(&ro->ro_dst)->sin_addr = inp->inp_faddr; 899 rtalloc(ro); 900 } 901 return (ro->ro_rt); 902 } 903 904 struct sockaddr_in * 905 in_selectsrc(struct sockaddr_in *sin, struct route *ro, 906 int soopts, struct ip_moptions *mopts, int *errorp) 907 { 908 struct in_ifaddr *ia; 909 910 ia = (struct in_ifaddr *)0; 911 /* 912 * If route is known or can be allocated now, 913 * our src addr is taken from the i/f, else punt. 914 * Note that we should check the address family of the cached 915 * destination, in case of sharing the cache with IPv6. 916 */ 917 if (ro->ro_rt && 918 (ro->ro_dst.sa_family != AF_INET || 919 !in_hosteq(satosin(&ro->ro_dst)->sin_addr, sin->sin_addr) || 920 soopts & SO_DONTROUTE)) { 921 RTFREE(ro->ro_rt); 922 ro->ro_rt = (struct rtentry *)0; 923 } 924 if ((soopts & SO_DONTROUTE) == 0 && /*XXX*/ 925 (ro->ro_rt == (struct rtentry *)0 || 926 ro->ro_rt->rt_ifp == (struct ifnet *)0)) { 927 /* No route yet, so try to acquire one */ 928 bzero(&ro->ro_dst, sizeof(struct sockaddr_in)); 929 ro->ro_dst.sa_family = AF_INET; 930 ro->ro_dst.sa_len = sizeof(struct sockaddr_in); 931 satosin(&ro->ro_dst)->sin_addr = sin->sin_addr; 932 rtalloc(ro); 933 } 934 /* 935 * If we found a route, use the address 936 * corresponding to the outgoing interface 937 * unless it is the loopback (in case a route 938 * to our address on another net goes to loopback). 939 * 940 * XXX Is this still true? Do we care? 941 */ 942 if (ro->ro_rt && !(ro->ro_rt->rt_ifp->if_flags & IFF_LOOPBACK)) 943 ia = ifatoia(ro->ro_rt->rt_ifa); 944 if (ia == NULL) { 945 u_int16_t fport = sin->sin_port; 946 947 sin->sin_port = 0; 948 ia = ifatoia(ifa_ifwithladdr(sintosa(sin))); 949 sin->sin_port = fport; 950 if (ia == 0) { 951 /* Find 1st non-loopback AF_INET address */ 952 TAILQ_FOREACH(ia, &in_ifaddrhead, ia_list) { 953 if (!(ia->ia_ifp->if_flags & IFF_LOOPBACK)) 954 break; 955 } 956 } 957 if (ia == NULL) { 958 *errorp = EADDRNOTAVAIL; 959 return NULL; 960 } 961 } 962 /* 963 * If the destination address is multicast and an outgoing 964 * interface has been set as a multicast option, use the 965 * address of that interface as our source address. 966 */ 967 if (IN_MULTICAST(sin->sin_addr.s_addr) && mopts != NULL) { 968 struct ip_moptions *imo; 969 struct ifnet *ifp; 970 971 imo = mopts; 972 if (imo->imo_multicast_ifp != NULL) { 973 ifp = imo->imo_multicast_ifp; 974 IFP_TO_IA(ifp, ia); /* XXX */ 975 if (ia == 0) { 976 *errorp = EADDRNOTAVAIL; 977 return NULL; 978 } 979 } 980 } 981 return satosin(&ia->ia_addr); 982 } 983
Indexes created Tue Sep 23 07:09:52 GMT 2025