in_pcb.c revision 1.78
1 /* $NetBSD: in_pcb.c,v 1.78 2002/06/09 16:33:38 itojun 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. All advertising materials mentioning features or use of this software 82 * must display the following acknowledgement: 83 * This product includes software developed by the University of 84 * California, Berkeley and its contributors. 85 * 4. Neither the name of the University nor the names of its contributors 86 * may be used to endorse or promote products derived from this software 87 * without specific prior written permission. 88 * 89 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND 90 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 91 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 92 * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE 93 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 94 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 95 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 96 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 97 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 98 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 99 * SUCH DAMAGE. 100 * 101 * @(#)in_pcb.c 8.4 (Berkeley) 5/24/95 102 */ 103 104 #include <sys/cdefs.h> 105 __KERNEL_RCSID(0, "$NetBSD: in_pcb.c,v 1.78 2002/06/09 16:33:38 itojun Exp $"); 106 107 #include "opt_ipsec.h" 108 109 #include <sys/param.h> 110 #include <sys/systm.h> 111 #include <sys/malloc.h> 112 #include <sys/mbuf.h> 113 #include <sys/protosw.h> 114 #include <sys/socket.h> 115 #include <sys/socketvar.h> 116 #include <sys/ioctl.h> 117 #include <sys/errno.h> 118 #include <sys/time.h> 119 #include <sys/pool.h> 120 #include <sys/proc.h> 121 122 #include <net/if.h> 123 #include <net/route.h> 124 125 #include <netinet/in.h> 126 #include <netinet/in_systm.h> 127 #include <netinet/ip.h> 128 #include <netinet/in_pcb.h> 129 #include <netinet/in_var.h> 130 #include <netinet/ip_var.h> 131 132 #ifdef IPSEC 133 #include <netinet6/ipsec.h> 134 #include <netkey/key.h> 135 #endif /* IPSEC */ 136 137 struct in_addr zeroin_addr; 138 139 #define INPCBHASH_BIND(table, laddr, lport) \ 140 &(table)->inpt_bindhashtbl[ \ 141 ((ntohl((laddr).s_addr) + ntohs(lport))) & (table)->inpt_bindhash] 142 #define INPCBHASH_CONNECT(table, faddr, fport, laddr, lport) \ 143 &(table)->inpt_connecthashtbl[ \ 144 ((ntohl((faddr).s_addr) + ntohs(fport)) + \ 145 (ntohl((laddr).s_addr) + ntohs(lport))) & (table)->inpt_connecthash] 146 147 struct inpcb * 148 in_pcblookup_port __P((struct inpcbtable *, 149 struct in_addr, u_int, int)); 150 151 int anonportmin = IPPORT_ANONMIN; 152 int anonportmax = IPPORT_ANONMAX; 153 int lowportmin = IPPORT_RESERVEDMIN; 154 int lowportmax = IPPORT_RESERVEDMAX; 155 156 struct pool inpcb_pool; 157 158 void 159 in_pcbinit(table, bindhashsize, connecthashsize) 160 struct inpcbtable *table; 161 int bindhashsize, connecthashsize; 162 { 163 static int inpcb_pool_initialized; 164 165 if (inpcb_pool_initialized == 0) { 166 pool_init(&inpcb_pool, sizeof(struct inpcb), 0, 0, 0, 167 "inpcbpl", NULL); 168 inpcb_pool_initialized = 1; 169 } 170 171 CIRCLEQ_INIT(&table->inpt_queue); 172 table->inpt_bindhashtbl = hashinit(bindhashsize, HASH_LIST, M_PCB, 173 M_WAITOK, &table->inpt_bindhash); 174 table->inpt_connecthashtbl = hashinit(connecthashsize, HASH_LIST, 175 M_PCB, M_WAITOK, &table->inpt_connecthash); 176 table->inpt_lastlow = IPPORT_RESERVEDMAX; 177 table->inpt_lastport = (u_int16_t)anonportmax; 178 } 179 180 int 181 in_pcballoc(so, v) 182 struct socket *so; 183 void *v; 184 { 185 struct inpcbtable *table = v; 186 struct inpcb *inp; 187 int s; 188 #ifdef IPSEC 189 int error; 190 #endif 191 192 inp = pool_get(&inpcb_pool, PR_NOWAIT); 193 if (inp == NULL) 194 return (ENOBUFS); 195 bzero((caddr_t)inp, sizeof(*inp)); 196 inp->inp_table = table; 197 inp->inp_socket = so; 198 inp->inp_errormtu = -1; 199 #ifdef IPSEC 200 error = ipsec_init_policy(so, &inp->inp_sp); 201 if (error != 0) { 202 pool_put(&inpcb_pool, inp); 203 return error; 204 } 205 #endif 206 so->so_pcb = inp; 207 s = splnet(); 208 CIRCLEQ_INSERT_HEAD(&table->inpt_queue, inp, inp_queue); 209 in_pcbstate(inp, INP_ATTACHED); 210 splx(s); 211 return (0); 212 } 213 214 int 215 in_pcbbind(v, nam, p) 216 void *v; 217 struct mbuf *nam; 218 struct proc *p; 219 { 220 struct inpcb *inp = v; 221 struct socket *so = inp->inp_socket; 222 struct inpcbtable *table = inp->inp_table; 223 struct sockaddr_in *sin; 224 u_int16_t lport = 0; 225 int wild = 0, reuseport = (so->so_options & SO_REUSEPORT); 226 #ifndef IPNOPRIVPORTS 227 int error; 228 #endif 229 230 if (TAILQ_FIRST(&in_ifaddr) == 0) 231 return (EADDRNOTAVAIL); 232 if (inp->inp_lport || !in_nullhost(inp->inp_laddr)) 233 return (EINVAL); 234 if ((so->so_options & (SO_REUSEADDR|SO_REUSEPORT)) == 0) 235 wild = 1; 236 if (nam == 0) 237 goto noname; 238 sin = mtod(nam, struct sockaddr_in *); 239 if (nam->m_len != sizeof (*sin)) 240 return (EINVAL); 241 #ifdef notdef 242 /* 243 * We should check the family, but old programs 244 * incorrectly fail to initialize it. 245 */ 246 if (sin->sin_family != AF_INET) 247 return (EAFNOSUPPORT); 248 #endif 249 lport = sin->sin_port; 250 if (IN_MULTICAST(sin->sin_addr.s_addr)) { 251 /* 252 * Treat SO_REUSEADDR as SO_REUSEPORT for multicast; 253 * allow complete duplication of binding if 254 * SO_REUSEPORT is set, or if SO_REUSEADDR is set 255 * and a multicast address is bound on both 256 * new and duplicated sockets. 257 */ 258 if (so->so_options & SO_REUSEADDR) 259 reuseport = SO_REUSEADDR|SO_REUSEPORT; 260 } else if (!in_nullhost(sin->sin_addr)) { 261 sin->sin_port = 0; /* yech... */ 262 if (ifa_ifwithaddr(sintosa(sin)) == 0) 263 return (EADDRNOTAVAIL); 264 } 265 if (lport) { 266 struct inpcb *t; 267 #ifndef IPNOPRIVPORTS 268 /* GROSS */ 269 if (ntohs(lport) < IPPORT_RESERVED && 270 (p == 0 || (error = suser(p->p_ucred, &p->p_acflag)))) 271 return (EACCES); 272 #endif 273 if (so->so_uid && !IN_MULTICAST(sin->sin_addr.s_addr)) { 274 t = in_pcblookup_port(table, sin->sin_addr, lport, 1); 275 /* 276 * XXX: investigate ramifications of loosening this 277 * restriction so that as long as both ports have 278 * SO_REUSEPORT allow the bind 279 */ 280 if (t && 281 (!in_nullhost(sin->sin_addr) || 282 !in_nullhost(t->inp_laddr) || 283 (t->inp_socket->so_options & SO_REUSEPORT) == 0) 284 && (so->so_uid != t->inp_socket->so_uid)) { 285 return (EADDRINUSE); 286 } 287 } 288 t = in_pcblookup_port(table, sin->sin_addr, lport, wild); 289 if (t && (reuseport & t->inp_socket->so_options) == 0) 290 return (EADDRINUSE); 291 } 292 inp->inp_laddr = sin->sin_addr; 293 294 noname: 295 if (lport == 0) { 296 int cnt; 297 u_int16_t min, max; 298 u_int16_t *lastport; 299 300 if (inp->inp_flags & INP_LOWPORT) { 301 #ifndef IPNOPRIVPORTS 302 if (p == 0 || (error = suser(p->p_ucred, &p->p_acflag))) 303 return (EACCES); 304 #endif 305 min = lowportmin; 306 max = lowportmax; 307 lastport = &table->inpt_lastlow; 308 } else { 309 min = anonportmin; 310 max = anonportmax; 311 lastport = &table->inpt_lastport; 312 } 313 if (min > max) { /* sanity check */ 314 u_int16_t swp; 315 316 swp = min; 317 min = max; 318 max = swp; 319 } 320 321 lport = *lastport - 1; 322 for (cnt = max - min + 1; cnt; cnt--, lport--) { 323 if (lport < min || lport > max) 324 lport = max; 325 if (!in_pcblookup_port(table, inp->inp_laddr, 326 htons(lport), 1)) 327 goto found; 328 } 329 if (!in_nullhost(inp->inp_laddr)) 330 inp->inp_laddr.s_addr = INADDR_ANY; 331 return (EAGAIN); 332 found: 333 inp->inp_flags |= INP_ANONPORT; 334 *lastport = lport; 335 lport = htons(lport); 336 } 337 inp->inp_lport = lport; 338 in_pcbstate(inp, INP_BOUND); 339 return (0); 340 } 341 342 /* 343 * Connect from a socket to a specified address. 344 * Both address and port must be specified in argument sin. 345 * If don't have a local address for this socket yet, 346 * then pick one. 347 */ 348 int 349 in_pcbconnect(v, nam) 350 void *v; 351 struct mbuf *nam; 352 { 353 struct inpcb *inp = v; 354 struct in_ifaddr *ia; 355 struct sockaddr_in *ifaddr = NULL; 356 struct sockaddr_in *sin = mtod(nam, struct sockaddr_in *); 357 int error; 358 359 if (nam->m_len != sizeof (*sin)) 360 return (EINVAL); 361 if (sin->sin_family != AF_INET) 362 return (EAFNOSUPPORT); 363 if (sin->sin_port == 0) 364 return (EADDRNOTAVAIL); 365 if (TAILQ_FIRST(&in_ifaddr) != 0) { 366 /* 367 * If the destination address is INADDR_ANY, 368 * use any local address (likely loopback). 369 * If the supplied address is INADDR_BROADCAST, 370 * use the broadcast address of an interface 371 * which supports broadcast. (loopback does not) 372 */ 373 374 if (in_nullhost(sin->sin_addr)) { 375 sin->sin_addr = 376 TAILQ_FIRST(&in_ifaddr)->ia_addr.sin_addr; 377 } else if (sin->sin_addr.s_addr == INADDR_BROADCAST) { 378 TAILQ_FOREACH(ia, &in_ifaddr, ia_list) { 379 if (ia->ia_ifp->if_flags & IFF_BROADCAST) { 380 sin->sin_addr = 381 ia->ia_broadaddr.sin_addr; 382 break; 383 } 384 } 385 } 386 } 387 /* 388 * If we haven't bound which network number to use as ours, 389 * we will use the number of the outgoing interface. 390 * This depends on having done a routing lookup, which 391 * we will probably have to do anyway, so we might 392 * as well do it now. On the other hand if we are 393 * sending to multiple destinations we may have already 394 * done the lookup, so see if we can use the route 395 * from before. In any case, we only 396 * chose a port number once, even if sending to multiple 397 * destinations. 398 */ 399 if (in_nullhost(inp->inp_laddr)) { 400 int error; 401 ifaddr = in_selectsrc(sin, &inp->inp_route, 402 inp->inp_socket->so_options, inp->inp_moptions, &error); 403 if (ifaddr == NULL) { 404 if (error == 0) 405 error = EADDRNOTAVAIL; 406 return error; 407 } 408 } 409 if (in_pcblookup_connect(inp->inp_table, sin->sin_addr, sin->sin_port, 410 !in_nullhost(inp->inp_laddr) ? inp->inp_laddr : ifaddr->sin_addr, 411 inp->inp_lport) != 0) 412 return (EADDRINUSE); 413 if (in_nullhost(inp->inp_laddr)) { 414 if (inp->inp_lport == 0) { 415 error = in_pcbbind(inp, (struct mbuf *)0, 416 (struct proc *)0); 417 /* 418 * This used to ignore the return value 419 * completely, but we need to check for 420 * ephemeral port shortage. 421 * XXX Should we check for other errors, too? 422 */ 423 if (error == EAGAIN) 424 return (error); 425 } 426 inp->inp_laddr = ifaddr->sin_addr; 427 } 428 inp->inp_faddr = sin->sin_addr; 429 inp->inp_fport = sin->sin_port; 430 in_pcbstate(inp, INP_CONNECTED); 431 #ifdef IPSEC 432 if (inp->inp_socket->so_type == SOCK_STREAM) 433 ipsec_pcbconn(inp->inp_sp); 434 #endif 435 return (0); 436 } 437 438 void 439 in_pcbdisconnect(v) 440 void *v; 441 { 442 struct inpcb *inp = v; 443 444 inp->inp_faddr = zeroin_addr; 445 inp->inp_fport = 0; 446 in_pcbstate(inp, INP_BOUND); 447 if (inp->inp_socket->so_state & SS_NOFDREF) 448 in_pcbdetach(inp); 449 #ifdef IPSEC 450 ipsec_pcbdisconn(inp->inp_sp); 451 #endif 452 } 453 454 void 455 in_pcbdetach(v) 456 void *v; 457 { 458 struct inpcb *inp = v; 459 struct socket *so = inp->inp_socket; 460 int s; 461 462 #ifdef IPSEC 463 ipsec4_delete_pcbpolicy(inp); 464 #endif /*IPSEC*/ 465 so->so_pcb = 0; 466 sofree(so); 467 if (inp->inp_options) 468 (void)m_free(inp->inp_options); 469 if (inp->inp_route.ro_rt) 470 rtfree(inp->inp_route.ro_rt); 471 ip_freemoptions(inp->inp_moptions); 472 s = splnet(); 473 in_pcbstate(inp, INP_ATTACHED); 474 CIRCLEQ_REMOVE(&inp->inp_table->inpt_queue, inp, inp_queue); 475 splx(s); 476 pool_put(&inpcb_pool, inp); 477 } 478 479 void 480 in_setsockaddr(inp, nam) 481 struct inpcb *inp; 482 struct mbuf *nam; 483 { 484 struct sockaddr_in *sin; 485 486 nam->m_len = sizeof (*sin); 487 sin = mtod(nam, struct sockaddr_in *); 488 bzero((caddr_t)sin, sizeof (*sin)); 489 sin->sin_family = AF_INET; 490 sin->sin_len = sizeof(*sin); 491 sin->sin_port = inp->inp_lport; 492 sin->sin_addr = inp->inp_laddr; 493 } 494 495 void 496 in_setpeeraddr(inp, nam) 497 struct inpcb *inp; 498 struct mbuf *nam; 499 { 500 struct sockaddr_in *sin; 501 502 nam->m_len = sizeof (*sin); 503 sin = mtod(nam, struct sockaddr_in *); 504 bzero((caddr_t)sin, sizeof (*sin)); 505 sin->sin_family = AF_INET; 506 sin->sin_len = sizeof(*sin); 507 sin->sin_port = inp->inp_fport; 508 sin->sin_addr = inp->inp_faddr; 509 } 510 511 /* 512 * Pass some notification to all connections of a protocol 513 * associated with address dst. The local address and/or port numbers 514 * may be specified to limit the search. The "usual action" will be 515 * taken, depending on the ctlinput cmd. The caller must filter any 516 * cmds that are uninteresting (e.g., no error in the map). 517 * Call the protocol specific routine (if any) to report 518 * any errors for each matching socket. 519 * 520 * Must be called at splsoftnet. 521 */ 522 int 523 in_pcbnotify(table, faddr, fport_arg, laddr, lport_arg, errno, notify) 524 struct inpcbtable *table; 525 struct in_addr faddr, laddr; 526 u_int fport_arg, lport_arg; 527 int errno; 528 void (*notify) __P((struct inpcb *, int)); 529 { 530 struct inpcbhead *head; 531 struct inpcb *inp, *ninp; 532 u_int16_t fport = fport_arg, lport = lport_arg; 533 int nmatch; 534 535 if (in_nullhost(faddr) || notify == 0) 536 return (0); 537 538 nmatch = 0; 539 head = INPCBHASH_CONNECT(table, faddr, fport, laddr, lport); 540 for (inp = LIST_FIRST(head); inp != NULL; inp = ninp) { 541 ninp = LIST_NEXT(inp, inp_hash); 542 if (in_hosteq(inp->inp_faddr, faddr) && 543 inp->inp_fport == fport && 544 inp->inp_lport == lport && 545 in_hosteq(inp->inp_laddr, laddr)) { 546 (*notify)(inp, errno); 547 nmatch++; 548 } 549 } 550 return (nmatch); 551 } 552 553 void 554 in_pcbnotifyall(table, faddr, errno, notify) 555 struct inpcbtable *table; 556 struct in_addr faddr; 557 int errno; 558 void (*notify) __P((struct inpcb *, int)); 559 { 560 struct inpcb *inp, *ninp; 561 562 if (in_nullhost(faddr) || notify == 0) 563 return; 564 565 for (inp = CIRCLEQ_FIRST(&table->inpt_queue); 566 inp != (void *)&table->inpt_queue; 567 inp = ninp) { 568 ninp = CIRCLEQ_NEXT(inp, inp_queue); 569 if (in_hosteq(inp->inp_faddr, faddr)) 570 (*notify)(inp, errno); 571 } 572 } 573 574 void 575 in_pcbpurgeif0(table, ifp) 576 struct inpcbtable *table; 577 struct ifnet *ifp; 578 { 579 struct inpcb *inp, *ninp; 580 struct ip_moptions *imo; 581 int i, gap; 582 583 for (inp = CIRCLEQ_FIRST(&table->inpt_queue); 584 inp != (void *)&table->inpt_queue; 585 inp = ninp) { 586 ninp = CIRCLEQ_NEXT(inp, inp_queue); 587 imo = inp->inp_moptions; 588 if (imo != NULL) { 589 /* 590 * Unselect the outgoing interface if it is being 591 * detached. 592 */ 593 if (imo->imo_multicast_ifp == ifp) 594 imo->imo_multicast_ifp = NULL; 595 596 /* 597 * Drop multicast group membership if we joined 598 * through the interface being detached. 599 */ 600 for (i = 0, gap = 0; i < imo->imo_num_memberships; 601 i++) { 602 if (imo->imo_membership[i]->inm_ifp == ifp) { 603 in_delmulti(imo->imo_membership[i]); 604 gap++; 605 } else if (gap != 0) 606 imo->imo_membership[i - gap] = 607 imo->imo_membership[i]; 608 } 609 imo->imo_num_memberships -= gap; 610 } 611 } 612 } 613 614 void 615 in_pcbpurgeif(table, ifp) 616 struct inpcbtable *table; 617 struct ifnet *ifp; 618 { 619 struct inpcb *inp, *ninp; 620 621 for (inp = CIRCLEQ_FIRST(&table->inpt_queue); 622 inp != (void *)&table->inpt_queue; 623 inp = ninp) { 624 ninp = CIRCLEQ_NEXT(inp, inp_queue); 625 if (inp->inp_route.ro_rt != NULL && 626 inp->inp_route.ro_rt->rt_ifp == ifp) 627 in_rtchange(inp, 0); 628 } 629 } 630 631 /* 632 * Check for alternatives when higher level complains 633 * about service problems. For now, invalidate cached 634 * routing information. If the route was created dynamically 635 * (by a redirect), time to try a default gateway again. 636 */ 637 void 638 in_losing(inp) 639 struct inpcb *inp; 640 { 641 struct rtentry *rt; 642 struct rt_addrinfo info; 643 644 if ((rt = inp->inp_route.ro_rt)) { 645 inp->inp_route.ro_rt = 0; 646 bzero((caddr_t)&info, sizeof(info)); 647 info.rti_info[RTAX_DST] = &inp->inp_route.ro_dst; 648 info.rti_info[RTAX_GATEWAY] = rt->rt_gateway; 649 info.rti_info[RTAX_NETMASK] = rt_mask(rt); 650 rt_missmsg(RTM_LOSING, &info, rt->rt_flags, 0); 651 if (rt->rt_flags & RTF_DYNAMIC) 652 (void) rtrequest(RTM_DELETE, rt_key(rt), 653 rt->rt_gateway, rt_mask(rt), rt->rt_flags, 654 (struct rtentry **)0); 655 else 656 /* 657 * A new route can be allocated 658 * the next time output is attempted. 659 */ 660 rtfree(rt); 661 } 662 } 663 664 /* 665 * After a routing change, flush old routing 666 * and allocate a (hopefully) better one. 667 */ 668 void 669 in_rtchange(inp, errno) 670 struct inpcb *inp; 671 int errno; 672 { 673 674 if (inp->inp_route.ro_rt) { 675 rtfree(inp->inp_route.ro_rt); 676 inp->inp_route.ro_rt = 0; 677 /* 678 * A new route can be allocated the next time 679 * output is attempted. 680 */ 681 } 682 /* XXX SHOULD NOTIFY HIGHER-LEVEL PROTOCOLS */ 683 } 684 685 struct inpcb * 686 in_pcblookup_port(table, laddr, lport_arg, lookup_wildcard) 687 struct inpcbtable *table; 688 struct in_addr laddr; 689 u_int lport_arg; 690 int lookup_wildcard; 691 { 692 struct inpcb *inp, *match = 0; 693 int matchwild = 3, wildcard; 694 u_int16_t lport = lport_arg; 695 696 CIRCLEQ_FOREACH(inp, &table->inpt_queue, inp_queue) { 697 if (inp->inp_lport != lport) 698 continue; 699 wildcard = 0; 700 if (!in_nullhost(inp->inp_faddr)) 701 wildcard++; 702 if (in_nullhost(inp->inp_laddr)) { 703 if (!in_nullhost(laddr)) 704 wildcard++; 705 } else { 706 if (in_nullhost(laddr)) 707 wildcard++; 708 else { 709 if (!in_hosteq(inp->inp_laddr, laddr)) 710 continue; 711 } 712 } 713 if (wildcard && !lookup_wildcard) 714 continue; 715 if (wildcard < matchwild) { 716 match = inp; 717 matchwild = wildcard; 718 if (matchwild == 0) 719 break; 720 } 721 } 722 return (match); 723 } 724 725 #ifdef DIAGNOSTIC 726 int in_pcbnotifymiss = 0; 727 #endif 728 729 struct inpcb * 730 in_pcblookup_connect(table, faddr, fport_arg, laddr, lport_arg) 731 struct inpcbtable *table; 732 struct in_addr faddr, laddr; 733 u_int fport_arg, lport_arg; 734 { 735 struct inpcbhead *head; 736 struct inpcb *inp; 737 u_int16_t fport = fport_arg, lport = lport_arg; 738 739 head = INPCBHASH_CONNECT(table, faddr, fport, laddr, lport); 740 LIST_FOREACH(inp, head, inp_hash) { 741 if (in_hosteq(inp->inp_faddr, faddr) && 742 inp->inp_fport == fport && 743 inp->inp_lport == lport && 744 in_hosteq(inp->inp_laddr, laddr)) 745 goto out; 746 } 747 #ifdef DIAGNOSTIC 748 if (in_pcbnotifymiss) { 749 printf("in_pcblookup_connect: faddr=%08x fport=%d laddr=%08x lport=%d\n", 750 ntohl(faddr.s_addr), ntohs(fport), 751 ntohl(laddr.s_addr), ntohs(lport)); 752 } 753 #endif 754 return (0); 755 756 out: 757 /* Move this PCB to the head of hash chain. */ 758 if (inp != LIST_FIRST(head)) { 759 LIST_REMOVE(inp, inp_hash); 760 LIST_INSERT_HEAD(head, inp, inp_hash); 761 } 762 return (inp); 763 } 764 765 struct inpcb * 766 in_pcblookup_bind(table, laddr, lport_arg) 767 struct inpcbtable *table; 768 struct in_addr laddr; 769 u_int lport_arg; 770 { 771 struct inpcbhead *head; 772 struct inpcb *inp; 773 u_int16_t lport = lport_arg; 774 775 head = INPCBHASH_BIND(table, laddr, lport); 776 LIST_FOREACH(inp, head, inp_hash) { 777 if (inp->inp_lport == lport && 778 in_hosteq(inp->inp_laddr, laddr)) 779 goto out; 780 } 781 head = INPCBHASH_BIND(table, zeroin_addr, lport); 782 LIST_FOREACH(inp, head, inp_hash) { 783 if (inp->inp_lport == lport && 784 in_hosteq(inp->inp_laddr, zeroin_addr)) 785 goto out; 786 } 787 #ifdef DIAGNOSTIC 788 if (in_pcbnotifymiss) { 789 printf("in_pcblookup_bind: laddr=%08x lport=%d\n", 790 ntohl(laddr.s_addr), ntohs(lport)); 791 } 792 #endif 793 return (0); 794 795 out: 796 /* Move this PCB to the head of hash chain. */ 797 if (inp != LIST_FIRST(head)) { 798 LIST_REMOVE(inp, inp_hash); 799 LIST_INSERT_HEAD(head, inp, inp_hash); 800 } 801 return (inp); 802 } 803 804 void 805 in_pcbstate(inp, state) 806 struct inpcb *inp; 807 int state; 808 { 809 810 if (inp->inp_state > INP_ATTACHED) 811 LIST_REMOVE(inp, inp_hash); 812 813 switch (state) { 814 case INP_BOUND: 815 LIST_INSERT_HEAD(INPCBHASH_BIND(inp->inp_table, 816 inp->inp_laddr, inp->inp_lport), inp, inp_hash); 817 break; 818 case INP_CONNECTED: 819 LIST_INSERT_HEAD(INPCBHASH_CONNECT(inp->inp_table, 820 inp->inp_faddr, inp->inp_fport, 821 inp->inp_laddr, inp->inp_lport), inp, inp_hash); 822 break; 823 } 824 825 inp->inp_state = state; 826 } 827 828 struct rtentry * 829 in_pcbrtentry(inp) 830 struct inpcb *inp; 831 { 832 struct route *ro; 833 834 ro = &inp->inp_route; 835 836 if (ro->ro_rt && ((ro->ro_rt->rt_flags & RTF_UP) == 0 || 837 !in_hosteq(satosin(&ro->ro_dst)->sin_addr, inp->inp_faddr))) { 838 RTFREE(ro->ro_rt); 839 ro->ro_rt = (struct rtentry *)NULL; 840 } 841 if (ro->ro_rt == (struct rtentry *)NULL && 842 !in_nullhost(inp->inp_faddr)) { 843 bzero(&ro->ro_dst, sizeof(struct sockaddr_in)); 844 ro->ro_dst.sa_family = AF_INET; 845 ro->ro_dst.sa_len = sizeof(ro->ro_dst); 846 satosin(&ro->ro_dst)->sin_addr = inp->inp_faddr; 847 rtalloc(ro); 848 } 849 return (ro->ro_rt); 850 } 851 852 struct sockaddr_in * 853 in_selectsrc(sin, ro, soopts, mopts, errorp) 854 struct sockaddr_in *sin; 855 struct route *ro; 856 int soopts; 857 struct ip_moptions *mopts; 858 int *errorp; 859 { 860 struct in_ifaddr *ia; 861 862 ia = (struct in_ifaddr *)0; 863 /* 864 * If route is known or can be allocated now, 865 * our src addr is taken from the i/f, else punt. 866 * Note that we should check the address family of the cached 867 * destination, in case of sharing the cache with IPv6. 868 */ 869 if (ro->ro_rt && 870 (ro->ro_dst.sa_family != AF_INET || 871 !in_hosteq(satosin(&ro->ro_dst)->sin_addr, sin->sin_addr) || 872 soopts & SO_DONTROUTE)) { 873 RTFREE(ro->ro_rt); 874 ro->ro_rt = (struct rtentry *)0; 875 } 876 if ((soopts & SO_DONTROUTE) == 0 && /*XXX*/ 877 (ro->ro_rt == (struct rtentry *)0 || 878 ro->ro_rt->rt_ifp == (struct ifnet *)0)) { 879 /* No route yet, so try to acquire one */ 880 bzero(&ro->ro_dst, sizeof(struct sockaddr_in)); 881 ro->ro_dst.sa_family = AF_INET; 882 ro->ro_dst.sa_len = sizeof(struct sockaddr_in); 883 satosin(&ro->ro_dst)->sin_addr = sin->sin_addr; 884 rtalloc(ro); 885 } 886 /* 887 * If we found a route, use the address 888 * corresponding to the outgoing interface 889 * unless it is the loopback (in case a route 890 * to our address on another net goes to loopback). 891 * 892 * XXX Is this still true? Do we care? 893 */ 894 if (ro->ro_rt && !(ro->ro_rt->rt_ifp->if_flags & IFF_LOOPBACK)) 895 ia = ifatoia(ro->ro_rt->rt_ifa); 896 if (ia == NULL) { 897 u_int16_t fport = sin->sin_port; 898 899 sin->sin_port = 0; 900 ia = ifatoia(ifa_ifwithladdr(sintosa(sin))); 901 sin->sin_port = fport; 902 if (ia == 0) { 903 /* Find 1st non-loopback AF_INET address */ 904 TAILQ_FOREACH(ia, &in_ifaddr, ia_list) { 905 if (!(ia->ia_ifp->if_flags & IFF_LOOPBACK)) 906 break; 907 } 908 } 909 if (ia == NULL) { 910 *errorp = EADDRNOTAVAIL; 911 return NULL; 912 } 913 } 914 /* 915 * If the destination address is multicast and an outgoing 916 * interface has been set as a multicast option, use the 917 * address of that interface as our source address. 918 */ 919 if (IN_MULTICAST(sin->sin_addr.s_addr) && mopts != NULL) { 920 struct ip_moptions *imo; 921 struct ifnet *ifp; 922 923 imo = mopts; 924 if (imo->imo_multicast_ifp != NULL) { 925 ifp = imo->imo_multicast_ifp; 926 IFP_TO_IA(ifp, ia); /* XXX */ 927 if (ia == 0) { 928 *errorp = EADDRNOTAVAIL; 929 return NULL; 930 } 931 } 932 } 933 return satosin(&ia->ia_addr); 934 } 935
Indexes created Mon Sep 22 05:09:51 GMT 2025