in_pcb.c revision 1.99
1 /* $NetBSD: in_pcb.c,v 1.99 2005/05/07 17:42:09 christos 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 1.99 2005/05/07 17:42:09 christos 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> 118 119 #include <net/if.h> 120 #include <net/route.h> 121 122 #include <netinet/in.h> 123 #include <netinet/in_systm.h> 124 #include <netinet/ip.h> 125 #include <netinet/in_pcb.h> 126 #include <netinet/in_var.h> 127 #include <netinet/ip_var.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 <netinet6/ipsec.h> 137 #include <netkey/key.h> 138 #elif FAST_IPSEC 139 #include <netipsec/ipsec.h> 140 #include <netipsec/key.h> 141 #endif /* IPSEC */ 142 143 struct in_addr zeroin_addr; 144 145 #define INPCBHASH_PORT(table, lport) \ 146 &(table)->inpt_porthashtbl[ntohs(lport) & (table)->inpt_porthash] 147 #define INPCBHASH_BIND(table, laddr, lport) \ 148 &(table)->inpt_bindhashtbl[ \ 149 ((ntohl((laddr).s_addr) + ntohs(lport))) & (table)->inpt_bindhash] 150 #define INPCBHASH_CONNECT(table, faddr, fport, laddr, lport) \ 151 &(table)->inpt_connecthashtbl[ \ 152 ((ntohl((faddr).s_addr) + ntohs(fport)) + \ 153 (ntohl((laddr).s_addr) + ntohs(lport))) & (table)->inpt_connecthash] 154 155 int anonportmin = IPPORT_ANONMIN; 156 int anonportmax = IPPORT_ANONMAX; 157 int lowportmin = IPPORT_RESERVEDMIN; 158 int lowportmax = IPPORT_RESERVEDMAX; 159 160 POOL_INIT(inpcb_pool, sizeof(struct inpcb), 0, 0, 0, "inpcbpl", NULL); 161 162 void 163 in_pcbinit(struct inpcbtable *table, int bindhashsize, int connecthashsize) 164 { 165 166 CIRCLEQ_INIT(&table->inpt_queue); 167 table->inpt_porthashtbl = hashinit(bindhashsize, HASH_LIST, M_PCB, 168 M_WAITOK, &table->inpt_porthash); 169 table->inpt_bindhashtbl = hashinit(bindhashsize, HASH_LIST, M_PCB, 170 M_WAITOK, &table->inpt_bindhash); 171 table->inpt_connecthashtbl = hashinit(connecthashsize, HASH_LIST, 172 M_PCB, M_WAITOK, &table->inpt_connecthash); 173 table->inpt_lastlow = IPPORT_RESERVEDMAX; 174 table->inpt_lastport = (u_int16_t)anonportmax; 175 } 176 177 int 178 in_pcballoc(struct socket *so, void *v) 179 { 180 struct inpcbtable *table = v; 181 struct inpcb *inp; 182 int s; 183 #if defined(IPSEC) || defined(FAST_IPSEC) 184 int error; 185 #endif 186 187 inp = pool_get(&inpcb_pool, PR_NOWAIT); 188 if (inp == NULL) 189 return (ENOBUFS); 190 bzero((caddr_t)inp, sizeof(*inp)); 191 inp->inp_af = AF_INET; 192 inp->inp_table = table; 193 inp->inp_socket = so; 194 inp->inp_errormtu = -1; 195 #if defined(IPSEC) || defined(FAST_IPSEC) 196 error = ipsec_init_pcbpolicy(so, &inp->inp_sp); 197 if (error != 0) { 198 pool_put(&inpcb_pool, inp); 199 return error; 200 } 201 #endif 202 so->so_pcb = inp; 203 s = splnet(); 204 CIRCLEQ_INSERT_HEAD(&table->inpt_queue, &inp->inp_head, 205 inph_queue); 206 LIST_INSERT_HEAD(INPCBHASH_PORT(table, inp->inp_lport), &inp->inp_head, 207 inph_lhash); 208 in_pcbstate(inp, INP_ATTACHED); 209 splx(s); 210 return (0); 211 } 212 213 int 214 in_pcbbind(void *v, struct mbuf *nam, struct proc *p) 215 { 216 struct in_ifaddr *ia = NULL; 217 struct inpcb *inp = v; 218 struct socket *so = inp->inp_socket; 219 struct inpcbtable *table = inp->inp_table; 220 struct sockaddr_in *sin; 221 u_int16_t lport = 0; 222 int wild = 0, reuseport = (so->so_options & SO_REUSEPORT); 223 224 if (inp->inp_af != AF_INET) 225 return (EINVAL); 226 227 if (TAILQ_FIRST(&in_ifaddrhead) == 0) 228 return (EADDRNOTAVAIL); 229 if (inp->inp_lport || !in_nullhost(inp->inp_laddr)) 230 return (EINVAL); 231 if ((so->so_options & (SO_REUSEADDR|SO_REUSEPORT)) == 0) 232 wild = 1; 233 if (nam == 0) 234 goto noname; 235 sin = mtod(nam, struct sockaddr_in *); 236 if (nam->m_len != sizeof (*sin)) 237 return (EINVAL); 238 if (sin->sin_family != AF_INET) 239 return (EAFNOSUPPORT); 240 lport = sin->sin_port; 241 if (IN_MULTICAST(sin->sin_addr.s_addr)) { 242 /* 243 * Treat SO_REUSEADDR as SO_REUSEPORT for multicast; 244 * allow complete duplication of binding if 245 * SO_REUSEPORT is set, or if SO_REUSEADDR is set 246 * and a multicast address is bound on both 247 * new and duplicated sockets. 248 */ 249 if (so->so_options & SO_REUSEADDR) 250 reuseport = SO_REUSEADDR|SO_REUSEPORT; 251 } else if (!in_nullhost(sin->sin_addr)) { 252 sin->sin_port = 0; /* yech... */ 253 INADDR_TO_IA(sin->sin_addr, ia); 254 /* check for broadcast addresses */ 255 if (ia == NULL) 256 ia = ifatoia(ifa_ifwithaddr(sintosa(sin))); 257 if (ia == NULL) 258 return (EADDRNOTAVAIL); 259 } 260 if (lport) { 261 struct inpcb *t; 262 #ifdef INET6 263 struct in6pcb *t6; 264 struct in6_addr mapped; 265 #endif 266 #ifndef IPNOPRIVPORTS 267 /* GROSS */ 268 if (ntohs(lport) < IPPORT_RESERVED && 269 (p == 0 || suser(p->p_ucred, &p->p_acflag))) 270 return (EACCES); 271 #endif 272 #ifdef INET6 273 memset(&mapped, 0, sizeof(mapped)); 274 mapped.s6_addr16[5] = 0xffff; 275 memcpy(&mapped.s6_addr32[3], &sin->sin_addr, 276 sizeof(mapped.s6_addr32[3])); 277 t6 = in6_pcblookup_port(table, &mapped, lport, wild); 278 if (t6 && (reuseport & t6->in6p_socket->so_options) == 0) 279 return (EADDRINUSE); 280 #endif 281 if (so->so_uidinfo->ui_uid && !IN_MULTICAST(sin->sin_addr.s_addr)) { 282 t = in_pcblookup_port(table, sin->sin_addr, lport, 1); 283 /* 284 * XXX: investigate ramifications of loosening this 285 * restriction so that as long as both ports have 286 * SO_REUSEPORT allow the bind 287 */ 288 if (t && 289 (!in_nullhost(sin->sin_addr) || 290 !in_nullhost(t->inp_laddr) || 291 (t->inp_socket->so_options & SO_REUSEPORT) == 0) 292 && (so->so_uidinfo->ui_uid != t->inp_socket->so_uidinfo->ui_uid)) { 293 return (EADDRINUSE); 294 } 295 } 296 t = in_pcblookup_port(table, sin->sin_addr, lport, wild); 297 if (t && (reuseport & t->inp_socket->so_options) == 0) 298 return (EADDRINUSE); 299 } 300 inp->inp_laddr = sin->sin_addr; 301 302 noname: 303 if (lport == 0) { 304 int cnt; 305 u_int16_t min, max; 306 u_int16_t *lastport; 307 308 if (inp->inp_flags & INP_LOWPORT) { 309 #ifndef IPNOPRIVPORTS 310 if (p == 0 || suser(p->p_ucred, &p->p_acflag)) 311 return (EACCES); 312 #endif 313 min = lowportmin; 314 max = lowportmax; 315 lastport = &table->inpt_lastlow; 316 } else { 317 min = anonportmin; 318 max = anonportmax; 319 lastport = &table->inpt_lastport; 320 } 321 if (min > max) { /* sanity check */ 322 u_int16_t swp; 323 324 swp = min; 325 min = max; 326 max = swp; 327 } 328 329 lport = *lastport - 1; 330 for (cnt = max - min + 1; cnt; cnt--, lport--) { 331 if (lport < min || lport > max) 332 lport = max; 333 if (!in_pcblookup_port(table, inp->inp_laddr, 334 htons(lport), 1)) 335 goto found; 336 } 337 if (!in_nullhost(inp->inp_laddr)) 338 inp->inp_laddr.s_addr = INADDR_ANY; 339 return (EAGAIN); 340 found: 341 inp->inp_flags |= INP_ANONPORT; 342 *lastport = lport; 343 lport = htons(lport); 344 } 345 inp->inp_lport = lport; 346 LIST_REMOVE(&inp->inp_head, inph_lhash); 347 LIST_INSERT_HEAD(INPCBHASH_PORT(table, inp->inp_lport), &inp->inp_head, 348 inph_lhash); 349 in_pcbstate(inp, INP_BOUND); 350 return (0); 351 } 352 353 /* 354 * Connect from a socket to a specified address. 355 * Both address and port must be specified in argument sin. 356 * If don't have a local address for this socket yet, 357 * then pick one. 358 */ 359 int 360 in_pcbconnect(void *v, struct mbuf *nam) 361 { 362 struct inpcb *inp = v; 363 struct in_ifaddr *ia = NULL; 364 struct sockaddr_in *ifaddr = NULL; 365 struct sockaddr_in *sin = mtod(nam, struct sockaddr_in *); 366 int error; 367 368 if (inp->inp_af != AF_INET) 369 return (EINVAL); 370 371 if (nam->m_len != sizeof (*sin)) 372 return (EINVAL); 373 if (sin->sin_family != AF_INET) 374 return (EAFNOSUPPORT); 375 if (sin->sin_port == 0) 376 return (EADDRNOTAVAIL); 377 if (TAILQ_FIRST(&in_ifaddrhead) != 0) { 378 /* 379 * If the destination address is INADDR_ANY, 380 * use any local address (likely loopback). 381 * If the supplied address is INADDR_BROADCAST, 382 * use the broadcast address of an interface 383 * which supports broadcast. (loopback does not) 384 */ 385 386 if (in_nullhost(sin->sin_addr)) { 387 sin->sin_addr = 388 TAILQ_FIRST(&in_ifaddrhead)->ia_addr.sin_addr; 389 } else if (sin->sin_addr.s_addr == INADDR_BROADCAST) { 390 TAILQ_FOREACH(ia, &in_ifaddrhead, ia_list) { 391 if (ia->ia_ifp->if_flags & IFF_BROADCAST) { 392 sin->sin_addr = 393 ia->ia_broadaddr.sin_addr; 394 break; 395 } 396 } 397 } 398 } 399 /* 400 * If we haven't bound which network number to use as ours, 401 * we will use the number of the outgoing interface. 402 * This depends on having done a routing lookup, which 403 * we will probably have to do anyway, so we might 404 * as well do it now. On the other hand if we are 405 * sending to multiple destinations we may have already 406 * done the lookup, so see if we can use the route 407 * from before. In any case, we only 408 * chose a port number once, even if sending to multiple 409 * destinations. 410 */ 411 if (in_nullhost(inp->inp_laddr)) { 412 int error; 413 ifaddr = in_selectsrc(sin, &inp->inp_route, 414 inp->inp_socket->so_options, inp->inp_moptions, &error); 415 if (ifaddr == NULL) { 416 if (error == 0) 417 error = EADDRNOTAVAIL; 418 return error; 419 } 420 INADDR_TO_IA(ifaddr->sin_addr, ia); 421 if (ia == NULL) 422 return (EADDRNOTAVAIL); 423 } 424 if (in_pcblookup_connect(inp->inp_table, sin->sin_addr, sin->sin_port, 425 !in_nullhost(inp->inp_laddr) ? inp->inp_laddr : ifaddr->sin_addr, 426 inp->inp_lport) != 0) 427 return (EADDRINUSE); 428 if (in_nullhost(inp->inp_laddr)) { 429 if (inp->inp_lport == 0) { 430 error = in_pcbbind(inp, (struct mbuf *)0, 431 (struct proc *)0); 432 /* 433 * This used to ignore the return value 434 * completely, but we need to check for 435 * ephemeral port shortage. 436 * XXX Should we check for other errors, too? 437 */ 438 if (error == EAGAIN) 439 return (error); 440 } 441 inp->inp_laddr = ifaddr->sin_addr; 442 } 443 inp->inp_faddr = sin->sin_addr; 444 inp->inp_fport = sin->sin_port; 445 in_pcbstate(inp, INP_CONNECTED); 446 #if defined(IPSEC) || defined(FAST_IPSEC) 447 if (inp->inp_socket->so_type == SOCK_STREAM) 448 ipsec_pcbconn(inp->inp_sp); 449 #endif 450 return (0); 451 } 452 453 void 454 in_pcbdisconnect(void *v) 455 { 456 struct inpcb *inp = v; 457 458 if (inp->inp_af != AF_INET) 459 return; 460 461 inp->inp_faddr = zeroin_addr; 462 inp->inp_fport = 0; 463 in_pcbstate(inp, INP_BOUND); 464 #if defined(IPSEC) || defined(FAST_IPSEC) 465 ipsec_pcbdisconn(inp->inp_sp); 466 #endif 467 if (inp->inp_socket->so_state & SS_NOFDREF) 468 in_pcbdetach(inp); 469 } 470 471 void 472 in_pcbdetach(void *v) 473 { 474 struct inpcb *inp = v; 475 struct socket *so = inp->inp_socket; 476 int s; 477 478 if (inp->inp_af != AF_INET) 479 return; 480 481 #if defined(IPSEC) || defined(FAST_IPSEC) 482 ipsec4_delete_pcbpolicy(inp); 483 #endif /*IPSEC*/ 484 so->so_pcb = 0; 485 sofree(so); 486 if (inp->inp_options) 487 (void)m_free(inp->inp_options); 488 if (inp->inp_route.ro_rt) 489 rtfree(inp->inp_route.ro_rt); 490 ip_freemoptions(inp->inp_moptions); 491 s = splnet(); 492 in_pcbstate(inp, INP_ATTACHED); 493 LIST_REMOVE(&inp->inp_head, inph_lhash); 494 CIRCLEQ_REMOVE(&inp->inp_table->inpt_queue, &inp->inp_head, 495 inph_queue); 496 splx(s); 497 pool_put(&inpcb_pool, inp); 498 } 499 500 void 501 in_setsockaddr(struct inpcb *inp, struct mbuf *nam) 502 { 503 struct sockaddr_in *sin; 504 505 if (inp->inp_af != AF_INET) 506 return; 507 508 nam->m_len = sizeof (*sin); 509 sin = mtod(nam, struct sockaddr_in *); 510 bzero((caddr_t)sin, sizeof (*sin)); 511 sin->sin_family = AF_INET; 512 sin->sin_len = sizeof(*sin); 513 sin->sin_port = inp->inp_lport; 514 sin->sin_addr = inp->inp_laddr; 515 } 516 517 void 518 in_setpeeraddr(struct inpcb *inp, struct mbuf *nam) 519 { 520 struct sockaddr_in *sin; 521 522 if (inp->inp_af != AF_INET) 523 return; 524 525 nam->m_len = sizeof (*sin); 526 sin = mtod(nam, struct sockaddr_in *); 527 bzero((caddr_t)sin, sizeof (*sin)); 528 sin->sin_family = AF_INET; 529 sin->sin_len = sizeof(*sin); 530 sin->sin_port = inp->inp_fport; 531 sin->sin_addr = inp->inp_faddr; 532 } 533 534 /* 535 * Pass some notification to all connections of a protocol 536 * associated with address dst. The local address and/or port numbers 537 * may be specified to limit the search. The "usual action" will be 538 * taken, depending on the ctlinput cmd. The caller must filter any 539 * cmds that are uninteresting (e.g., no error in the map). 540 * Call the protocol specific routine (if any) to report 541 * any errors for each matching socket. 542 * 543 * Must be called at splsoftnet. 544 */ 545 int 546 in_pcbnotify(struct inpcbtable *table, struct in_addr faddr, u_int fport_arg, 547 struct in_addr laddr, u_int lport_arg, int errno, 548 void (*notify)(struct inpcb *, int)) 549 { 550 struct inpcbhead *head; 551 struct inpcb *inp, *ninp; 552 u_int16_t fport = fport_arg, lport = lport_arg; 553 int nmatch; 554 555 if (in_nullhost(faddr) || notify == 0) 556 return (0); 557 558 nmatch = 0; 559 head = INPCBHASH_CONNECT(table, faddr, fport, laddr, lport); 560 for (inp = (struct inpcb *)LIST_FIRST(head); inp != NULL; inp = ninp) { 561 ninp = (struct inpcb *)LIST_NEXT(inp, inp_hash); 562 if (inp->inp_af != AF_INET) 563 continue; 564 if (in_hosteq(inp->inp_faddr, faddr) && 565 inp->inp_fport == fport && 566 inp->inp_lport == lport && 567 in_hosteq(inp->inp_laddr, laddr)) { 568 (*notify)(inp, errno); 569 nmatch++; 570 } 571 } 572 return (nmatch); 573 } 574 575 void 576 in_pcbnotifyall(struct inpcbtable *table, struct in_addr faddr, int errno, 577 void (*notify)(struct inpcb *, int)) 578 { 579 struct inpcb *inp, *ninp; 580 581 if (in_nullhost(faddr) || notify == 0) 582 return; 583 584 for (inp = (struct inpcb *)CIRCLEQ_FIRST(&table->inpt_queue); 585 inp != (void *)&table->inpt_queue; 586 inp = ninp) { 587 ninp = (struct inpcb *)CIRCLEQ_NEXT(inp, inp_queue); 588 if (inp->inp_af != AF_INET) 589 continue; 590 if (in_hosteq(inp->inp_faddr, faddr)) 591 (*notify)(inp, errno); 592 } 593 } 594 595 void 596 in_pcbpurgeif0(struct inpcbtable *table, struct ifnet *ifp) 597 { 598 struct inpcb *inp, *ninp; 599 struct ip_moptions *imo; 600 int i, gap; 601 602 for (inp = (struct inpcb *)CIRCLEQ_FIRST(&table->inpt_queue); 603 inp != (void *)&table->inpt_queue; 604 inp = ninp) { 605 ninp = (struct inpcb *)CIRCLEQ_NEXT(inp, inp_queue); 606 if (inp->inp_af != AF_INET) 607 continue; 608 imo = inp->inp_moptions; 609 if (imo != NULL) { 610 /* 611 * Unselect the outgoing interface if it is being 612 * detached. 613 */ 614 if (imo->imo_multicast_ifp == ifp) 615 imo->imo_multicast_ifp = NULL; 616 617 /* 618 * Drop multicast group membership if we joined 619 * through the interface being detached. 620 */ 621 for (i = 0, gap = 0; i < imo->imo_num_memberships; 622 i++) { 623 if (imo->imo_membership[i]->inm_ifp == ifp) { 624 in_delmulti(imo->imo_membership[i]); 625 gap++; 626 } else if (gap != 0) 627 imo->imo_membership[i - gap] = 628 imo->imo_membership[i]; 629 } 630 imo->imo_num_memberships -= gap; 631 } 632 } 633 } 634 635 void 636 in_pcbpurgeif(struct inpcbtable *table, struct ifnet *ifp) 637 { 638 struct inpcb *inp, *ninp; 639 640 for (inp = (struct inpcb *)CIRCLEQ_FIRST(&table->inpt_queue); 641 inp != (void *)&table->inpt_queue; 642 inp = ninp) { 643 ninp = (struct inpcb *)CIRCLEQ_NEXT(inp, inp_queue); 644 if (inp->inp_af != AF_INET) 645 continue; 646 if (inp->inp_route.ro_rt != NULL && 647 inp->inp_route.ro_rt->rt_ifp == ifp) 648 in_rtchange(inp, 0); 649 } 650 } 651 652 /* 653 * Check for alternatives when higher level complains 654 * about service problems. For now, invalidate cached 655 * routing information. If the route was created dynamically 656 * (by a redirect), time to try a default gateway again. 657 */ 658 void 659 in_losing(struct inpcb *inp) 660 { 661 struct rtentry *rt; 662 struct rt_addrinfo info; 663 664 if (inp->inp_af != AF_INET) 665 return; 666 667 if ((rt = inp->inp_route.ro_rt)) { 668 inp->inp_route.ro_rt = 0; 669 bzero((caddr_t)&info, sizeof(info)); 670 info.rti_info[RTAX_DST] = &inp->inp_route.ro_dst; 671 info.rti_info[RTAX_GATEWAY] = rt->rt_gateway; 672 info.rti_info[RTAX_NETMASK] = rt_mask(rt); 673 rt_missmsg(RTM_LOSING, &info, rt->rt_flags, 0); 674 if (rt->rt_flags & RTF_DYNAMIC) 675 (void) rtrequest(RTM_DELETE, rt_key(rt), 676 rt->rt_gateway, rt_mask(rt), rt->rt_flags, 677 (struct rtentry **)0); 678 else 679 /* 680 * A new route can be allocated 681 * the next time output is attempted. 682 */ 683 rtfree(rt); 684 } 685 } 686 687 /* 688 * After a routing change, flush old routing 689 * and allocate a (hopefully) better one. 690 */ 691 void 692 in_rtchange(struct inpcb *inp, int errno) 693 { 694 695 if (inp->inp_af != AF_INET) 696 return; 697 698 if (inp->inp_route.ro_rt) { 699 rtfree(inp->inp_route.ro_rt); 700 inp->inp_route.ro_rt = 0; 701 /* 702 * A new route can be allocated the next time 703 * output is attempted. 704 */ 705 } 706 /* XXX SHOULD NOTIFY HIGHER-LEVEL PROTOCOLS */ 707 } 708 709 struct inpcb * 710 in_pcblookup_port(struct inpcbtable *table, struct in_addr laddr, 711 u_int lport_arg, int lookup_wildcard) 712 { 713 struct inpcbhead *head; 714 struct inpcb_hdr *inph; 715 struct inpcb *inp, *match = 0; 716 int matchwild = 3, wildcard; 717 u_int16_t lport = lport_arg; 718 719 head = INPCBHASH_PORT(table, lport); 720 LIST_FOREACH(inph, head, inph_lhash) { 721 inp = (struct inpcb *)inph; 722 if (inp->inp_af != AF_INET) 723 continue; 724 725 if (inp->inp_lport != lport) 726 continue; 727 wildcard = 0; 728 if (!in_nullhost(inp->inp_faddr)) 729 wildcard++; 730 if (in_nullhost(inp->inp_laddr)) { 731 if (!in_nullhost(laddr)) 732 wildcard++; 733 } else { 734 if (in_nullhost(laddr)) 735 wildcard++; 736 else { 737 if (!in_hosteq(inp->inp_laddr, laddr)) 738 continue; 739 } 740 } 741 if (wildcard && !lookup_wildcard) 742 continue; 743 if (wildcard < matchwild) { 744 match = inp; 745 matchwild = wildcard; 746 if (matchwild == 0) 747 break; 748 } 749 } 750 return (match); 751 } 752 753 #ifdef DIAGNOSTIC 754 int in_pcbnotifymiss = 0; 755 #endif 756 757 struct inpcb * 758 in_pcblookup_connect(struct inpcbtable *table, 759 struct in_addr faddr, u_int fport_arg, 760 struct in_addr laddr, u_int lport_arg) 761 { 762 struct inpcbhead *head; 763 struct inpcb_hdr *inph; 764 struct inpcb *inp; 765 u_int16_t fport = fport_arg, lport = lport_arg; 766 767 head = INPCBHASH_CONNECT(table, faddr, fport, laddr, lport); 768 LIST_FOREACH(inph, head, inph_hash) { 769 inp = (struct inpcb *)inph; 770 if (inp->inp_af != AF_INET) 771 continue; 772 773 if (in_hosteq(inp->inp_faddr, faddr) && 774 inp->inp_fport == fport && 775 inp->inp_lport == lport && 776 in_hosteq(inp->inp_laddr, laddr)) 777 goto out; 778 } 779 #ifdef DIAGNOSTIC 780 if (in_pcbnotifymiss) { 781 printf("in_pcblookup_connect: faddr=%08x fport=%d laddr=%08x lport=%d\n", 782 ntohl(faddr.s_addr), ntohs(fport), 783 ntohl(laddr.s_addr), ntohs(lport)); 784 } 785 #endif 786 return (0); 787 788 out: 789 /* Move this PCB to the head of hash chain. */ 790 inph = &inp->inp_head; 791 if (inph != LIST_FIRST(head)) { 792 LIST_REMOVE(inph, inph_hash); 793 LIST_INSERT_HEAD(head, inph, inph_hash); 794 } 795 return (inp); 796 } 797 798 struct inpcb * 799 in_pcblookup_bind(struct inpcbtable *table, 800 struct in_addr laddr, u_int lport_arg) 801 { 802 struct inpcbhead *head; 803 struct inpcb_hdr *inph; 804 struct inpcb *inp; 805 u_int16_t lport = lport_arg; 806 807 head = INPCBHASH_BIND(table, laddr, lport); 808 LIST_FOREACH(inph, head, inph_hash) { 809 inp = (struct inpcb *)inph; 810 if (inp->inp_af != AF_INET) 811 continue; 812 813 if (inp->inp_lport == lport && 814 in_hosteq(inp->inp_laddr, laddr)) 815 goto out; 816 } 817 head = INPCBHASH_BIND(table, zeroin_addr, lport); 818 LIST_FOREACH(inph, head, inph_hash) { 819 inp = (struct inpcb *)inph; 820 if (inp->inp_af != AF_INET) 821 continue; 822 823 if (inp->inp_lport == lport && 824 in_hosteq(inp->inp_laddr, zeroin_addr)) 825 goto out; 826 } 827 #ifdef DIAGNOSTIC 828 if (in_pcbnotifymiss) { 829 printf("in_pcblookup_bind: laddr=%08x lport=%d\n", 830 ntohl(laddr.s_addr), ntohs(lport)); 831 } 832 #endif 833 return (0); 834 835 out: 836 /* Move this PCB to the head of hash chain. */ 837 inph = &inp->inp_head; 838 if (inph != LIST_FIRST(head)) { 839 LIST_REMOVE(inph, inph_hash); 840 LIST_INSERT_HEAD(head, inph, inph_hash); 841 } 842 return (inp); 843 } 844 845 void 846 in_pcbstate(struct inpcb *inp, int state) 847 { 848 849 if (inp->inp_af != AF_INET) 850 return; 851 852 if (inp->inp_state > INP_ATTACHED) 853 LIST_REMOVE(&inp->inp_head, inph_hash); 854 855 switch (state) { 856 case INP_BOUND: 857 LIST_INSERT_HEAD(INPCBHASH_BIND(inp->inp_table, 858 inp->inp_laddr, inp->inp_lport), &inp->inp_head, 859 inph_hash); 860 break; 861 case INP_CONNECTED: 862 LIST_INSERT_HEAD(INPCBHASH_CONNECT(inp->inp_table, 863 inp->inp_faddr, inp->inp_fport, 864 inp->inp_laddr, inp->inp_lport), &inp->inp_head, 865 inph_hash); 866 break; 867 } 868 869 inp->inp_state = state; 870 } 871 872 struct rtentry * 873 in_pcbrtentry(struct inpcb *inp) 874 { 875 struct route *ro; 876 877 if (inp->inp_af != AF_INET) 878 return (NULL); 879 880 ro = &inp->inp_route; 881 882 if (ro->ro_rt && ((ro->ro_rt->rt_flags & RTF_UP) == 0 || 883 !in_hosteq(satosin(&ro->ro_dst)->sin_addr, inp->inp_faddr))) { 884 RTFREE(ro->ro_rt); 885 ro->ro_rt = (struct rtentry *)NULL; 886 } 887 if (ro->ro_rt == (struct rtentry *)NULL && 888 !in_nullhost(inp->inp_faddr)) { 889 bzero(&ro->ro_dst, sizeof(struct sockaddr_in)); 890 ro->ro_dst.sa_family = AF_INET; 891 ro->ro_dst.sa_len = sizeof(ro->ro_dst); 892 satosin(&ro->ro_dst)->sin_addr = inp->inp_faddr; 893 rtalloc(ro); 894 } 895 return (ro->ro_rt); 896 } 897 898 struct sockaddr_in * 899 in_selectsrc(struct sockaddr_in *sin, struct route *ro, 900 int soopts, struct ip_moptions *mopts, int *errorp) 901 { 902 struct in_ifaddr *ia; 903 904 ia = (struct in_ifaddr *)0; 905 /* 906 * If route is known or can be allocated now, 907 * our src addr is taken from the i/f, else punt. 908 * Note that we should check the address family of the cached 909 * destination, in case of sharing the cache with IPv6. 910 */ 911 if (ro->ro_rt && 912 (ro->ro_dst.sa_family != AF_INET || 913 !in_hosteq(satosin(&ro->ro_dst)->sin_addr, sin->sin_addr) || 914 soopts & SO_DONTROUTE)) { 915 RTFREE(ro->ro_rt); 916 ro->ro_rt = (struct rtentry *)0; 917 } 918 if ((soopts & SO_DONTROUTE) == 0 && /*XXX*/ 919 (ro->ro_rt == (struct rtentry *)0 || 920 ro->ro_rt->rt_ifp == (struct ifnet *)0)) { 921 /* No route yet, so try to acquire one */ 922 bzero(&ro->ro_dst, sizeof(struct sockaddr_in)); 923 ro->ro_dst.sa_family = AF_INET; 924 ro->ro_dst.sa_len = sizeof(struct sockaddr_in); 925 satosin(&ro->ro_dst)->sin_addr = sin->sin_addr; 926 rtalloc(ro); 927 } 928 /* 929 * If we found a route, use the address 930 * corresponding to the outgoing interface 931 * unless it is the loopback (in case a route 932 * to our address on another net goes to loopback). 933 * 934 * XXX Is this still true? Do we care? 935 */ 936 if (ro->ro_rt && !(ro->ro_rt->rt_ifp->if_flags & IFF_LOOPBACK)) 937 ia = ifatoia(ro->ro_rt->rt_ifa); 938 if (ia == NULL) { 939 u_int16_t fport = sin->sin_port; 940 941 sin->sin_port = 0; 942 ia = ifatoia(ifa_ifwithladdr(sintosa(sin))); 943 sin->sin_port = fport; 944 if (ia == 0) { 945 /* Find 1st non-loopback AF_INET address */ 946 TAILQ_FOREACH(ia, &in_ifaddrhead, ia_list) { 947 if (!(ia->ia_ifp->if_flags & IFF_LOOPBACK)) 948 break; 949 } 950 } 951 if (ia == NULL) { 952 *errorp = EADDRNOTAVAIL; 953 return NULL; 954 } 955 } 956 /* 957 * If the destination address is multicast and an outgoing 958 * interface has been set as a multicast option, use the 959 * address of that interface as our source address. 960 */ 961 if (IN_MULTICAST(sin->sin_addr.s_addr) && mopts != NULL) { 962 struct ip_moptions *imo; 963 struct ifnet *ifp; 964 965 imo = mopts; 966 if (imo->imo_multicast_ifp != NULL) { 967 ifp = imo->imo_multicast_ifp; 968 IFP_TO_IA(ifp, ia); /* XXX */ 969 if (ia == 0) { 970 *errorp = EADDRNOTAVAIL; 971 return NULL; 972 } 973 } 974 } 975 return satosin(&ia->ia_addr); 976 } 977
Indexes created Tue Sep 23 14:10:03 GMT 2025