1 /* 2 * Copyright (c) 1983, 1993 3 * The Regents of the University of California. All rights reserved. 4 * 5 * Redistribution and use in source and binary forms, with or without 6 * modification, are permitted provided that the following conditions 7 * are met: 8 * 1. Redistributions of source code must retain the above copyright 9 * notice, this list of conditions and the following disclaimer. 10 * 2. Redistributions in binary form must reproduce the above copyright 11 * notice, this list of conditions and the following disclaimer in the 12 * documentation and/or other materials provided with the distribution. 13 * 3. All advertising materials mentioning features or use of this software 14 * must display the following acknowledgment: 15 * This product includes software developed by the University of 16 * California, Berkeley and its contributors. 17 * 4. Neither the name of the University nor the names of its contributors 18 * may be used to endorse or promote products derived from this software 19 * without specific prior written permission. 20 * 21 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND 22 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 23 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 24 * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE 25 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 26 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 27 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 28 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 29 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 30 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 31 * SUCH DAMAGE. 32 * 33 * $FreeBSD: src/sbin/routed/if.c,v 1.6.2.1 2000/08/14 17:00:03 sheldonh Exp $ 34 */ 35 36 #include "defs.h" 37 #include "pathnames.h" 38 39 #if !defined(sgi) && !defined(__NetBSD__) 40 static char sccsid[] __attribute__((unused)) = "@(#)if.c 8.1 (Berkeley) 6/5/93"; 41 #elif defined(__NetBSD__) 42 #include <sys/cdefs.h> 43 __RCSID("$NetBSD$"); 44 #endif 45 46 struct interface *ifnet; /* all interfaces */ 47 48 /* hash table for all interfaces, big enough to tolerate ridiculous 49 * numbers of IP aliases. Crazy numbers of aliases such as 7000 50 * still will not do well, but not just in looking up interfaces 51 * by name or address. 52 */ 53 #define AHASH_LEN 211 /* must be prime */ 54 #define AHASH(a) &ahash_tbl[(a)%AHASH_LEN] 55 struct interface *ahash_tbl[AHASH_LEN]; 56 57 #define BHASH_LEN 211 /* must be prime */ 58 #define BHASH(a) &bhash_tbl[(a)%BHASH_LEN] 59 struct interface *bhash_tbl[BHASH_LEN]; 60 61 struct interface *remote_if; /* remote interfaces */ 62 63 /* hash for physical interface names. 64 * Assume there are never more 100 or 200 real interfaces, and that 65 * aliases are put on the end of the hash chains. 66 */ 67 #define NHASH_LEN 97 68 struct interface *nhash_tbl[NHASH_LEN]; 69 70 int tot_interfaces; /* # of remote and local interfaces */ 71 int rip_interfaces; /* # of interfaces doing RIP */ 72 int foundloopback; /* valid flag for loopaddr */ 73 naddr loopaddr; /* our address on loopback */ 74 struct rt_spare loop_rts; 75 76 struct timeval ifinit_timer; 77 static struct timeval last_ifinit; 78 #define IF_RESCAN_DELAY() (last_ifinit.tv_sec == now.tv_sec \ 79 && last_ifinit.tv_usec == now.tv_usec \ 80 && timercmp(&ifinit_timer, &now, >)) 81 82 int have_ripv1_out; /* have a RIPv1 interface */ 83 int have_ripv1_in; 84 85 86 static struct interface** 87 nhash(char *p) 88 { 89 u_int i; 90 91 for (i = 0; *p != '\0'; p++) { 92 i = ((i<<1) & 0x7fffffff) | ((i>>31) & 1); 93 i ^= *p; 94 } 95 return &nhash_tbl[i % NHASH_LEN]; 96 } 97 98 99 /* Link a new interface into the lists and hash tables. 100 */ 101 void 102 if_link(struct interface *ifp) 103 { 104 struct interface **hifp; 105 106 ifp->int_prev = &ifnet; 107 ifp->int_next = ifnet; 108 if (ifnet != NULL) 109 ifnet->int_prev = &ifp->int_next; 110 ifnet = ifp; 111 112 hifp = AHASH(ifp->int_addr); 113 ifp->int_ahash_prev = hifp; 114 if ((ifp->int_ahash = *hifp) != NULL) 115 (*hifp)->int_ahash_prev = &ifp->int_ahash; 116 *hifp = ifp; 117 118 if (ifp->int_if_flags & IFF_BROADCAST) { 119 hifp = BHASH(ifp->int_brdaddr); 120 ifp->int_bhash_prev = hifp; 121 if ((ifp->int_bhash = *hifp) != NULL) 122 (*hifp)->int_bhash_prev = &ifp->int_bhash; 123 *hifp = ifp; 124 } 125 126 if (ifp->int_state & IS_REMOTE) { 127 ifp->int_rlink_prev = &remote_if; 128 ifp->int_rlink = remote_if; 129 if (remote_if != NULL) 130 remote_if->int_rlink_prev = &ifp->int_rlink; 131 remote_if = ifp; 132 } 133 134 hifp = nhash(ifp->int_name); 135 if (ifp->int_state & IS_ALIAS) { 136 /* put aliases on the end of the hash chain */ 137 while (*hifp != NULL) 138 hifp = &(*hifp)->int_nhash; 139 } 140 ifp->int_nhash_prev = hifp; 141 if ((ifp->int_nhash = *hifp) != NULL) 142 (*hifp)->int_nhash_prev = &ifp->int_nhash; 143 *hifp = ifp; 144 } 145 146 147 /* Find the interface with an address 148 */ 149 struct interface * 150 ifwithaddr(naddr addr, 151 int bcast, /* notice IFF_BROADCAST address */ 152 int remote) /* include IS_REMOTE interfaces */ 153 { 154 struct interface *ifp, *possible = NULL; 155 156 remote = (remote == 0) ? IS_REMOTE : 0; 157 158 for (ifp = *AHASH(addr); ifp; ifp = ifp->int_ahash) { 159 if (ifp->int_addr != addr) 160 continue; 161 if ((ifp->int_state & remote) != 0) 162 continue; 163 if ((ifp->int_state & (IS_BROKE | IS_PASSIVE)) == 0) 164 return ifp; 165 possible = ifp; 166 } 167 168 if (possible || !bcast) 169 return possible; 170 171 for (ifp = *BHASH(addr); ifp; ifp = ifp->int_bhash) { 172 if (ifp->int_brdaddr != addr) 173 continue; 174 if ((ifp->int_state & remote) != 0) 175 continue; 176 if ((ifp->int_state & (IS_BROKE | IS_PASSIVE)) == 0) 177 return ifp; 178 possible = ifp; 179 } 180 181 return possible; 182 } 183 184 185 /* find the interface with a name 186 */ 187 struct interface * 188 ifwithname(char *name, /* "ec0" or whatever */ 189 naddr addr) /* 0 or network address */ 190 { 191 struct interface *ifp; 192 193 for (;;) { 194 for (ifp = *nhash(name); ifp != NULL; ifp = ifp->int_nhash) { 195 /* If the network address is not specified, 196 * ignore any alias interfaces. Otherwise, look 197 * for the interface with the target name and address. 198 */ 199 if (!strcmp(ifp->int_name, name) 200 && ((addr == 0 && !(ifp->int_state & IS_ALIAS)) 201 || (ifp->int_addr == addr))) 202 return ifp; 203 } 204 205 /* If there is no known interface, maybe there is a 206 * new interface. So just once look for new interfaces. 207 */ 208 if (IF_RESCAN_DELAY()) 209 return 0; 210 ifinit(); 211 } 212 } 213 214 215 struct interface * 216 ifwithindex(u_short idx, int rescan_ok) 217 { 218 struct interface *ifp; 219 220 for (;;) { 221 for (ifp = ifnet; NULL != ifp; ifp = ifp->int_next) { 222 if (ifp->int_index == idx) 223 return ifp; 224 } 225 226 /* If there is no known interface, maybe there is a 227 * new interface. So just once look for new interfaces. 228 */ 229 if (!rescan_ok 230 || IF_RESCAN_DELAY()) 231 return 0; 232 ifinit(); 233 } 234 } 235 236 237 /* Find an interface from which the specified address 238 * should have come from. Used for figuring out which 239 * interface a packet came in on. 240 */ 241 struct interface * 242 iflookup(naddr addr) 243 { 244 struct interface *ifp, *maybe; 245 246 maybe = NULL; 247 for (;;) { 248 for (ifp = ifnet; ifp; ifp = ifp->int_next) { 249 if (ifp->int_if_flags & IFF_POINTOPOINT) { 250 /* finished with a match */ 251 if (ifp->int_dstaddr == addr) 252 return ifp; 253 254 } else { 255 /* finished with an exact match */ 256 if (ifp->int_addr == addr) 257 return ifp; 258 259 /* Look for the longest approximate match. 260 */ 261 if (on_net(addr, ifp->int_net, ifp->int_mask) 262 && (maybe == NULL 263 || ifp->int_mask > maybe->int_mask)) 264 maybe = ifp; 265 } 266 } 267 268 if (maybe != NULL 269 || IF_RESCAN_DELAY()) 270 return maybe; 271 272 /* If there is no known interface, maybe there is a 273 * new interface. So just once look for new interfaces. 274 */ 275 ifinit(); 276 } 277 } 278 279 280 /* Return the classical netmask for an IP address. 281 */ 282 naddr /* host byte order */ 283 std_mask(naddr addr) /* network byte order */ 284 { 285 addr = ntohl(addr); /* was a host, not a network */ 286 287 if (addr == 0) /* default route has mask 0 */ 288 return 0; 289 if (IN_CLASSA(addr)) 290 return IN_CLASSA_NET; 291 if (IN_CLASSB(addr)) 292 return IN_CLASSB_NET; 293 return IN_CLASSC_NET; 294 } 295 296 297 /* Find the netmask that would be inferred by RIPv1 listeners 298 * on the given interface for a given network. 299 * If no interface is specified, look for the best fitting interface. 300 */ 301 naddr 302 ripv1_mask_net(naddr addr, /* in network byte order */ 303 struct interface *ifp) /* as seen on this interface */ 304 { 305 struct r1net *r1p; 306 naddr mask = 0; 307 308 if (addr == 0) /* default always has 0 mask */ 309 return mask; 310 311 if (ifp != NULL && ifp->int_ripv1_mask != HOST_MASK) { 312 /* If the target network is that of the associated interface 313 * on which it arrived, then use the netmask of the interface. 314 */ 315 if (on_net(addr, ifp->int_net, ifp->int_std_mask)) 316 mask = ifp->int_ripv1_mask; 317 318 } else { 319 /* Examine all interfaces, and if it the target seems 320 * to have the same network number of an interface, use the 321 * netmask of that interface. If there is more than one 322 * such interface, prefer the interface with the longest 323 * match. 324 */ 325 for (ifp = ifnet; ifp != NULL; ifp = ifp->int_next) { 326 if (on_net(addr, ifp->int_std_net, ifp->int_std_mask) 327 && ifp->int_ripv1_mask > mask 328 && ifp->int_ripv1_mask != HOST_MASK) 329 mask = ifp->int_ripv1_mask; 330 } 331 332 } 333 334 /* check special definitions */ 335 if (mask == 0) { 336 for (r1p = r1nets; r1p != NULL; r1p = r1p->r1net_next) { 337 if (on_net(addr, r1p->r1net_net, r1p->r1net_match) 338 && r1p->r1net_mask > mask) 339 mask = r1p->r1net_mask; 340 } 341 342 /* Otherwise, make the classic A/B/C guess. 343 */ 344 if (mask == 0) 345 mask = std_mask(addr); 346 } 347 348 return mask; 349 } 350 351 352 naddr 353 ripv1_mask_host(naddr addr, /* in network byte order */ 354 struct interface *ifp) /* as seen on this interface */ 355 { 356 naddr mask = ripv1_mask_net(addr, ifp); 357 358 359 /* If the computed netmask does not mask the address, 360 * then assume it is a host address 361 */ 362 if ((ntohl(addr) & ~mask) != 0) 363 mask = HOST_MASK; 364 return mask; 365 } 366 367 368 /* See if a IP address looks reasonable as a destination 369 */ 370 int /* 0=bad */ 371 check_dst(naddr addr) 372 { 373 addr = ntohl(addr); 374 375 if (IN_CLASSA(addr)) { 376 if (addr == 0) 377 return 1; /* default */ 378 379 addr >>= IN_CLASSA_NSHIFT; 380 return (addr != 0 && addr != IN_LOOPBACKNET); 381 } 382 383 return (IN_CLASSB(addr) || IN_CLASSC(addr)); 384 } 385 386 387 /* See a new interface duplicates an existing interface. 388 */ 389 struct interface * 390 check_dup(naddr addr, /* IP address, so network byte order */ 391 naddr dstaddr, /* ditto */ 392 naddr mask, /* mask, so host byte order */ 393 int if_flags) 394 { 395 struct interface *ifp; 396 397 for (ifp = ifnet; NULL != ifp; ifp = ifp->int_next) { 398 if (ifp->int_mask != mask) 399 continue; 400 401 if (!iff_up(ifp->int_if_flags)) 402 continue; 403 404 /* The local address can only be shared with a point-to-point 405 * link. 406 */ 407 if (ifp->int_addr == addr 408 && (((if_flags|ifp->int_if_flags) & IFF_POINTOPOINT) == 0)) 409 return ifp; 410 411 if (on_net(ifp->int_dstaddr, ntohl(dstaddr),mask)) 412 return ifp; 413 } 414 return 0; 415 } 416 417 418 /* See that a remote gateway is reachable. 419 * Note that the answer can change as real interfaces come and go. 420 */ 421 int /* 0=bad */ 422 check_remote(struct interface *ifp) 423 { 424 struct rt_entry *rt; 425 426 /* do not worry about other kinds */ 427 if (!(ifp->int_state & IS_REMOTE)) 428 return 1; 429 430 rt = rtfind(ifp->int_addr); 431 if (rt != NULL 432 && rt->rt_ifp != 0 433 &&on_net(ifp->int_addr, 434 rt->rt_ifp->int_net, rt->rt_ifp->int_mask)) 435 return 1; 436 437 /* the gateway cannot be reached directly from one of our 438 * interfaces 439 */ 440 if (!(ifp->int_state & IS_BROKE)) { 441 msglog("unreachable gateway %s in "_PATH_GATEWAYS, 442 naddr_ntoa(ifp->int_addr)); 443 if_bad(ifp); 444 } 445 return 0; 446 } 447 448 449 /* Delete an interface. 450 */ 451 static void 452 ifdel(struct interface *ifp) 453 { 454 struct ip_mreq m; 455 struct interface *ifp1; 456 457 458 trace_if("Del", ifp); 459 460 ifp->int_state |= IS_BROKE; 461 462 /* unlink the interface 463 */ 464 *ifp->int_prev = ifp->int_next; 465 if (ifp->int_next != 0) 466 ifp->int_next->int_prev = ifp->int_prev; 467 *ifp->int_ahash_prev = ifp->int_ahash; 468 if (ifp->int_ahash != 0) 469 ifp->int_ahash->int_ahash_prev = ifp->int_ahash_prev; 470 *ifp->int_nhash_prev = ifp->int_nhash; 471 if (ifp->int_nhash != 0) 472 ifp->int_nhash->int_nhash_prev = ifp->int_nhash_prev; 473 if (ifp->int_if_flags & IFF_BROADCAST) { 474 *ifp->int_bhash_prev = ifp->int_bhash; 475 if (ifp->int_bhash != 0) 476 ifp->int_bhash->int_bhash_prev = ifp->int_bhash_prev; 477 } 478 if (ifp->int_state & IS_REMOTE) { 479 *ifp->int_rlink_prev = ifp->int_rlink; 480 if (ifp->int_rlink != 0) 481 ifp->int_rlink->int_rlink_prev = ifp->int_rlink_prev; 482 } 483 484 if (!(ifp->int_state & IS_ALIAS)) { 485 /* delete aliases when the main interface dies 486 */ 487 for (ifp1 = ifnet; NULL != ifp1; ifp1 = ifp1->int_next) { 488 if (ifp1 != ifp 489 && !strcmp(ifp->int_name, ifp1->int_name)) 490 ifdel(ifp1); 491 } 492 493 if ((ifp->int_if_flags & IFF_MULTICAST) 494 #ifdef MCAST_PPP_BUG 495 && !(ifp->int_if_flags & IFF_POINTOPOINT) 496 #endif 497 && rip_sock >= 0) { 498 m.imr_multiaddr.s_addr = htonl(INADDR_RIP_GROUP); 499 m.imr_interface.s_addr = ((ifp->int_if_flags 500 & IFF_POINTOPOINT) 501 ? ifp->int_dstaddr 502 : ifp->int_addr); 503 if (setsockopt(rip_sock,IPPROTO_IP,IP_DROP_MEMBERSHIP, 504 &m, sizeof(m)) < 0 505 && errno != EADDRNOTAVAIL 506 && !TRACEACTIONS) 507 LOGERR("setsockopt(IP_DROP_MEMBERSHIP RIP)"); 508 if (rip_sock_mcast == ifp) 509 rip_sock_mcast = 0; 510 } 511 if (ifp->int_rip_sock >= 0) { 512 close(ifp->int_rip_sock); 513 ifp->int_rip_sock = -1; 514 fix_select(); 515 } 516 517 tot_interfaces--; 518 if (!IS_RIP_OFF(ifp->int_state)) 519 rip_interfaces--; 520 521 /* Zap all routes associated with this interface. 522 * Assume routes just using gateways beyond this interface 523 * will timeout naturally, and have probably already died. 524 */ 525 rn_walktree(rhead, walk_bad, 0); 526 527 set_rdisc_mg(ifp, 0); 528 if_bad_rdisc(ifp); 529 } 530 531 free(ifp); 532 } 533 534 535 /* Mark an interface ill. 536 */ 537 void 538 if_sick(struct interface *ifp) 539 { 540 if (0 == (ifp->int_state & (IS_SICK | IS_BROKE))) { 541 ifp->int_state |= IS_SICK; 542 ifp->int_act_time = NEVER; 543 trace_if("Chg", ifp); 544 545 LIM_SEC(ifinit_timer, now.tv_sec+CHECK_BAD_INTERVAL); 546 } 547 } 548 549 550 /* Mark an interface dead. 551 */ 552 void 553 if_bad(struct interface *ifp) 554 { 555 struct interface *ifp1; 556 557 558 if (ifp->int_state & IS_BROKE) 559 return; 560 561 LIM_SEC(ifinit_timer, now.tv_sec+CHECK_BAD_INTERVAL); 562 563 ifp->int_state |= (IS_BROKE | IS_SICK); 564 ifp->int_act_time = NEVER; 565 ifp->int_query_time = NEVER; 566 ifp->int_data.ts = now.tv_sec; 567 568 trace_if("Chg", ifp); 569 570 if (!(ifp->int_state & IS_ALIAS)) { 571 for (ifp1 = ifnet; NULL != ifp1; ifp1 = ifp1->int_next) { 572 if (ifp1 != ifp 573 && !strcmp(ifp->int_name, ifp1->int_name)) 574 if_bad(ifp1); 575 } 576 rn_walktree(rhead, walk_bad, 0); 577 if_bad_rdisc(ifp); 578 } 579 } 580 581 582 /* Mark an interface alive 583 */ 584 int /* 1=it was dead */ 585 if_ok(struct interface *ifp, 586 const char *type) 587 { 588 struct interface *ifp1; 589 590 591 if (!(ifp->int_state & IS_BROKE)) { 592 if (ifp->int_state & IS_SICK) { 593 trace_act("%sinterface %s to %s working better", 594 type, 595 ifp->int_name, naddr_ntoa(ifp->int_dstaddr)); 596 ifp->int_state &= ~IS_SICK; 597 } 598 return 0; 599 } 600 601 msglog("%sinterface %s to %s restored", 602 type, ifp->int_name, naddr_ntoa(ifp->int_dstaddr)); 603 ifp->int_state &= ~(IS_BROKE | IS_SICK); 604 ifp->int_data.ts = 0; 605 606 if (!(ifp->int_state & IS_ALIAS)) { 607 for (ifp1 = ifnet; NULL != ifp1; ifp1 = ifp1->int_next) { 608 if (ifp1 != ifp 609 && !strcmp(ifp->int_name, ifp1->int_name)) 610 if_ok(ifp1, type); 611 } 612 if_ok_rdisc(ifp); 613 } 614 615 if (ifp->int_state & IS_REMOTE) { 616 if (!addrouteforif(ifp)) 617 return 0; 618 } 619 return 1; 620 } 621 622 623 /* disassemble routing message 624 */ 625 void 626 rt_xaddrs(struct rt_addrinfo *info, 627 struct sockaddr *sa, 628 struct sockaddr *lim, 629 int addrs) 630 { 631 int i; 632 #ifdef _HAVE_SA_LEN 633 static struct sockaddr sa_zero; 634 #endif 635 #ifdef sgi 636 #define ROUNDUP(a) ((a) > 0 ? (1 + (((a) - 1) | (sizeof(__uint64_t) - 1))) \ 637 : sizeof(__uint64_t)) 638 #else 639 #define ROUNDUP(a) ((a) > 0 ? (1 + (((a) - 1) | (sizeof(long) - 1))) \ 640 : sizeof(long)) 641 #endif 642 643 644 memset(info, 0, sizeof(*info)); 645 info->rti_addrs = addrs; 646 for (i = 0; i < RTAX_MAX && sa < lim; i++) { 647 if ((addrs & (1 << i)) == 0) 648 continue; 649 #ifdef _HAVE_SA_LEN 650 info->rti_info[i] = (sa->sa_len != 0) ? sa : &sa_zero; 651 sa = (struct sockaddr *)((char*)(sa) 652 + ROUNDUP(sa->sa_len)); 653 #else 654 info->rti_info[i] = sa; 655 sa = (struct sockaddr *)((char*)(sa) 656 + ROUNDUP(_FAKE_SA_LEN_DST(sa))); 657 #endif 658 } 659 } 660 661 662 /* Find the network interfaces which have configured themselves. 663 * This must be done regularly, if only for extra addresses 664 * that come and go on interfaces. 665 */ 666 void 667 ifinit(void) 668 { 669 static char *sysctl_buf; 670 static size_t sysctl_buf_size = 0; 671 uint complaints = 0; 672 static u_int prev_complaints = 0; 673 # define COMP_NOT_INET 0x001 674 # define COMP_NOADDR 0x002 675 # define COMP_BADADDR 0x004 676 # define COMP_NODST 0x008 677 # define COMP_NOBADR 0x010 678 # define COMP_NOMASK 0x020 679 # define COMP_DUP 0x040 680 # define COMP_BAD_METRIC 0x080 681 # define COMP_NETMASK 0x100 682 683 struct interface ifs, ifs0, *ifp, *ifp1; 684 struct rt_entry *rt; 685 size_t needed; 686 int mib[6]; 687 struct if_msghdr *ifm; 688 struct ifa_msghdr *ifam, *ifam_lim, *ifam2; 689 int in, ierr, out, oerr; 690 struct intnet *intnetp; 691 struct rt_addrinfo info; 692 #ifdef SIOCGIFMETRIC 693 struct ifreq ifr; 694 #endif 695 696 697 last_ifinit = now; 698 ifinit_timer.tv_sec = now.tv_sec + (supplier 699 ? CHECK_ACT_INTERVAL 700 : CHECK_QUIET_INTERVAL); 701 702 /* mark all interfaces so we can get rid of those that disappear */ 703 for (ifp = ifnet; NULL != ifp; ifp = ifp->int_next) 704 ifp->int_state &= ~(IS_CHECKED | IS_DUP); 705 706 /* Fetch the interface list, without too many system calls 707 * since we do it repeatedly. 708 */ 709 mib[0] = CTL_NET; 710 mib[1] = PF_ROUTE; 711 mib[2] = 0; 712 mib[3] = AF_INET; 713 mib[4] = NET_RT_IFLIST; 714 mib[5] = 0; 715 for (;;) { 716 if ((needed = sysctl_buf_size) != 0) { 717 if (sysctl(mib, 6, sysctl_buf,&needed, 0, 0) >= 0) 718 break; 719 /* retry if the table grew */ 720 if (errno != ENOMEM && errno != EFAULT) 721 BADERR(1, "ifinit: sysctl(RT_IFLIST)"); 722 free(sysctl_buf); 723 needed = 0; 724 } 725 if (sysctl(mib, 6, 0, &needed, 0, 0) < 0) 726 BADERR(1,"ifinit: sysctl(RT_IFLIST) estimate"); 727 sysctl_buf = rtmalloc(sysctl_buf_size = needed, 728 "ifinit sysctl"); 729 } 730 731 ifam_lim = (struct ifa_msghdr *)(sysctl_buf + needed); 732 for (ifam = (struct ifa_msghdr *)sysctl_buf; 733 ifam < ifam_lim; 734 ifam = ifam2) { 735 736 ifam2 = (struct ifa_msghdr*)((char*)ifam + ifam->ifam_msglen); 737 738 if (ifam->ifam_type == RTM_IFINFO) { 739 struct sockaddr_dl *sdl; 740 741 ifm = (struct if_msghdr *)ifam; 742 /* make prototype structure for the IP aliases 743 */ 744 memset(&ifs0, 0, sizeof(ifs0)); 745 ifs0.int_rip_sock = -1; 746 ifs0.int_index = ifm->ifm_index; 747 ifs0.int_if_flags = ifm->ifm_flags; 748 ifs0.int_state = IS_CHECKED; 749 ifs0.int_query_time = NEVER; 750 ifs0.int_act_time = now.tv_sec; 751 ifs0.int_data.ts = now.tv_sec; 752 ifs0.int_data.ipackets = ifm->ifm_data.ifi_ipackets; 753 ifs0.int_data.ierrors = ifm->ifm_data.ifi_ierrors; 754 ifs0.int_data.opackets = ifm->ifm_data.ifi_opackets; 755 ifs0.int_data.oerrors = ifm->ifm_data.ifi_oerrors; 756 #ifdef sgi 757 ifs0.int_data.odrops = ifm->ifm_data.ifi_odrops; 758 #endif 759 sdl = (struct sockaddr_dl *)(ifm + 1); 760 sdl->sdl_data[sdl->sdl_nlen] = 0; 761 strncpy(ifs0.int_name, sdl->sdl_data, 762 MIN(sizeof(ifs0.int_name), sdl->sdl_nlen)); 763 continue; 764 } 765 if (ifam->ifam_type != RTM_NEWADDR) { 766 logbad(1,"ifinit: out of sync"); 767 continue; 768 } 769 rt_xaddrs(&info, (struct sockaddr *)(ifam+1), 770 (struct sockaddr *)ifam2, 771 ifam->ifam_addrs); 772 773 /* Prepare for the next address of this interface, which 774 * will be an alias. 775 * Do not output RIP or Router-Discovery packets via aliases. 776 */ 777 memcpy(&ifs, &ifs0, sizeof(ifs)); 778 ifs0.int_state |= (IS_ALIAS | IS_NO_RIP_OUT | IS_NO_RDISC); 779 780 if (INFO_IFA(&info) == 0) { 781 if (iff_up(ifs.int_if_flags)) { 782 if (!(prev_complaints & COMP_NOADDR)) 783 msglog("%s has no address", 784 ifs.int_name); 785 complaints |= COMP_NOADDR; 786 } 787 continue; 788 } 789 if (INFO_IFA(&info)->sa_family != AF_INET) { 790 if (iff_up(ifs.int_if_flags)) { 791 if (!(prev_complaints & COMP_NOT_INET)) 792 trace_act("%s: not AF_INET", 793 ifs.int_name); 794 complaints |= COMP_NOT_INET; 795 } 796 continue; 797 } 798 799 ifs.int_addr = S_ADDR(INFO_IFA(&info)); 800 801 if (ntohl(ifs.int_addr)>>24 == 0 802 || ntohl(ifs.int_addr)>>24 == 0xff) { 803 if (iff_up(ifs.int_if_flags)) { 804 if (!(prev_complaints & COMP_BADADDR)) 805 msglog("%s has a bad address", 806 ifs.int_name); 807 complaints |= COMP_BADADDR; 808 } 809 continue; 810 } 811 812 if (ifs.int_if_flags & IFF_LOOPBACK) { 813 ifs.int_state |= IS_PASSIVE | IS_NO_RIP | IS_NO_RDISC; 814 ifs.int_dstaddr = ifs.int_addr; 815 ifs.int_mask = HOST_MASK; 816 ifs.int_ripv1_mask = HOST_MASK; 817 ifs.int_std_mask = std_mask(ifs.int_dstaddr); 818 ifs.int_net = ntohl(ifs.int_dstaddr); 819 if (!foundloopback) { 820 foundloopback = 1; 821 loopaddr = ifs.int_addr; 822 loop_rts.rts_gate = loopaddr; 823 loop_rts.rts_router = loopaddr; 824 } 825 826 } else if (ifs.int_if_flags & IFF_POINTOPOINT) { 827 if (INFO_BRD(&info) == 0 828 || INFO_BRD(&info)->sa_family != AF_INET) { 829 if (iff_up(ifs.int_if_flags)) { 830 if (!(prev_complaints & COMP_NODST)) 831 msglog("%s has a bad" 832 " destination address", 833 ifs.int_name); 834 complaints |= COMP_NODST; 835 } 836 continue; 837 } 838 ifs.int_dstaddr = S_ADDR(INFO_BRD(&info)); 839 if (ntohl(ifs.int_dstaddr)>>24 == 0 840 || ntohl(ifs.int_dstaddr)>>24 == 0xff) { 841 if (iff_up(ifs.int_if_flags)) { 842 if (!(prev_complaints & COMP_NODST)) 843 msglog("%s has a bad" 844 " destination address", 845 ifs.int_name); 846 complaints |= COMP_NODST; 847 } 848 continue; 849 } 850 ifs.int_mask = HOST_MASK; 851 ifs.int_ripv1_mask = ntohl(S_ADDR(INFO_MASK(&info))); 852 ifs.int_std_mask = std_mask(ifs.int_dstaddr); 853 ifs.int_net = ntohl(ifs.int_dstaddr); 854 855 } else { 856 if (INFO_MASK(&info) == 0) { 857 if (iff_up(ifs.int_if_flags)) { 858 if (!(prev_complaints & COMP_NOMASK)) 859 msglog("%s has no netmask", 860 ifs.int_name); 861 complaints |= COMP_NOMASK; 862 } 863 continue; 864 } 865 ifs.int_dstaddr = ifs.int_addr; 866 ifs.int_mask = ntohl(S_ADDR(INFO_MASK(&info))); 867 ifs.int_ripv1_mask = ifs.int_mask; 868 ifs.int_std_mask = std_mask(ifs.int_addr); 869 ifs.int_net = ntohl(ifs.int_addr) & ifs.int_mask; 870 if (ifs.int_mask != ifs.int_std_mask) 871 ifs.int_state |= IS_SUBNET; 872 873 if (ifs.int_if_flags & IFF_BROADCAST) { 874 if (INFO_BRD(&info) == 0) { 875 if (iff_up(ifs.int_if_flags)) { 876 if (!(prev_complaints 877 & COMP_NOBADR)) 878 msglog("%s has" 879 "no broadcast address", 880 ifs.int_name); 881 complaints |= COMP_NOBADR; 882 } 883 continue; 884 } 885 ifs.int_brdaddr = S_ADDR(INFO_BRD(&info)); 886 } 887 } 888 ifs.int_std_net = ifs.int_net & ifs.int_std_mask; 889 ifs.int_std_addr = htonl(ifs.int_std_net); 890 891 /* Use a minimum metric of one. Treat the interface metric 892 * (default 0) as an increment to the hop count of one. 893 * 894 * The metric obtained from the routing socket dump of 895 * interface addresses is wrong. It is not set by the 896 * SIOCSIFMETRIC ioctl. 897 */ 898 #ifdef SIOCGIFMETRIC 899 strncpy(ifr.ifr_name, ifs.int_name, sizeof(ifr.ifr_name)); 900 if (ioctl(rt_sock, SIOCGIFMETRIC, &ifr) < 0) { 901 DBGERR(1, "ioctl(SIOCGIFMETRIC)"); 902 ifs.int_metric = 0; 903 } else { 904 ifs.int_metric = ifr.ifr_metric; 905 } 906 #else 907 ifs.int_metric = ifam->ifam_metric; 908 #endif 909 if (ifs.int_metric > HOPCNT_INFINITY) { 910 ifs.int_metric = 0; 911 if (!(prev_complaints & COMP_BAD_METRIC) 912 && iff_up(ifs.int_if_flags)) { 913 complaints |= COMP_BAD_METRIC; 914 msglog("%s has a metric of %d", 915 ifs.int_name, ifs.int_metric); 916 } 917 } 918 919 /* See if this is a familiar interface. 920 * If so, stop worrying about it if it is the same. 921 * Start it over if it now is to somewhere else, as happens 922 * frequently with PPP and SLIP. 923 */ 924 ifp = ifwithname(ifs.int_name, ((ifs.int_state & IS_ALIAS) 925 ? ifs.int_addr 926 : 0)); 927 if (ifp != NULL) { 928 ifp->int_state |= IS_CHECKED; 929 930 if (0 != ((ifp->int_if_flags ^ ifs.int_if_flags) 931 & (IFF_BROADCAST 932 | IFF_LOOPBACK 933 | IFF_POINTOPOINT 934 | IFF_MULTICAST)) 935 || 0 != ((ifp->int_state ^ ifs.int_state) 936 & IS_ALIAS) 937 || ifp->int_addr != ifs.int_addr 938 || ifp->int_brdaddr != ifs.int_brdaddr 939 || ifp->int_dstaddr != ifs.int_dstaddr 940 || ifp->int_mask != ifs.int_mask 941 || ifp->int_metric != ifs.int_metric) { 942 /* Forget old information about 943 * a changed interface. 944 */ 945 trace_act("interface %s has changed", 946 ifp->int_name); 947 ifdel(ifp); 948 ifp = NULL; 949 } 950 } 951 952 if (ifp != NULL) { 953 /* The primary representative of an alias worries 954 * about how things are working. 955 */ 956 if (ifp->int_state & IS_ALIAS) 957 continue; 958 959 /* note interfaces that have been turned off 960 */ 961 if (!iff_up(ifs.int_if_flags)) { 962 if (iff_up(ifp->int_if_flags)) { 963 msglog("interface %s to %s turned off", 964 ifp->int_name, 965 naddr_ntoa(ifp->int_dstaddr)); 966 if_bad(ifp); 967 ifp->int_if_flags &= ~IFF_UP; 968 } else if (now.tv_sec>(ifp->int_data.ts 969 + CHECK_BAD_INTERVAL)) { 970 trace_act("interface %s has been off" 971 " %ld seconds; forget it", 972 ifp->int_name, 973 now.tv_sec-ifp->int_data.ts); 974 ifdel(ifp); 975 } 976 continue; 977 } 978 /* or that were off and are now ok */ 979 if (!iff_up(ifp->int_if_flags)) { 980 ifp->int_if_flags |= IFF_UP; 981 if_ok(ifp, ""); 982 } 983 984 /* If it has been long enough, 985 * see if the interface is broken. 986 */ 987 if (now.tv_sec < ifp->int_data.ts+CHECK_BAD_INTERVAL) 988 continue; 989 990 in = ifs.int_data.ipackets - ifp->int_data.ipackets; 991 ierr = ifs.int_data.ierrors - ifp->int_data.ierrors; 992 out = ifs.int_data.opackets - ifp->int_data.opackets; 993 oerr = ifs.int_data.oerrors - ifp->int_data.oerrors; 994 #ifdef sgi 995 /* Through at least IRIX 6.2, PPP and SLIP 996 * count packets dropped by the filters. 997 * But FDDI rings stuck non-operational count 998 * dropped packets as they wait for improvement. 999 */ 1000 if (!(ifp->int_if_flags & IFF_POINTOPOINT)) 1001 oerr += (ifs.int_data.odrops 1002 - ifp->int_data.odrops); 1003 #endif 1004 /* If the interface just awoke, restart the counters. 1005 */ 1006 if (ifp->int_data.ts == 0) { 1007 ifp->int_data = ifs.int_data; 1008 continue; 1009 } 1010 ifp->int_data = ifs.int_data; 1011 1012 /* Withhold judgment when the short error 1013 * counters wrap or the interface is reset. 1014 */ 1015 if (ierr < 0 || in < 0 || oerr < 0 || out < 0) { 1016 LIM_SEC(ifinit_timer, 1017 now.tv_sec+CHECK_BAD_INTERVAL); 1018 continue; 1019 } 1020 1021 /* Withhold judgement when there is no traffic 1022 */ 1023 if (in == 0 && out == 0 && ierr == 0 && oerr == 0) 1024 continue; 1025 1026 /* It is bad if input or output is not working. 1027 * Require presistent problems before marking it dead. 1028 */ 1029 if ((in <= ierr && ierr > 0) 1030 || (out <= oerr && oerr > 0)) { 1031 if (!(ifp->int_state & IS_SICK)) { 1032 trace_act("interface %s to %s" 1033 " sick: in=%d ierr=%d" 1034 " out=%d oerr=%d", 1035 ifp->int_name, 1036 naddr_ntoa(ifp->int_dstaddr), 1037 in, ierr, out, oerr); 1038 if_sick(ifp); 1039 continue; 1040 } 1041 if (!(ifp->int_state & IS_BROKE)) { 1042 msglog("interface %s to %s broken:" 1043 " in=%d ierr=%d out=%d oerr=%d", 1044 ifp->int_name, 1045 naddr_ntoa(ifp->int_dstaddr), 1046 in, ierr, out, oerr); 1047 if_bad(ifp); 1048 } 1049 continue; 1050 } 1051 1052 /* otherwise, it is active and healthy 1053 */ 1054 ifp->int_act_time = now.tv_sec; 1055 if_ok(ifp, ""); 1056 continue; 1057 } 1058 1059 /* This is a new interface. 1060 * If it is dead, forget it. 1061 */ 1062 if (!iff_up(ifs.int_if_flags)) 1063 continue; 1064 1065 /* If it duplicates an existing interface, 1066 * complain about it, mark the other one 1067 * duplicated, and forget this one. 1068 */ 1069 ifp = check_dup(ifs.int_addr,ifs.int_dstaddr,ifs.int_mask, 1070 ifs.int_if_flags); 1071 if (ifp != NULL) { 1072 /* Ignore duplicates of itself, caused by having 1073 * IP aliases on the same network. 1074 */ 1075 if (!strcmp(ifp->int_name, ifs.int_name)) 1076 continue; 1077 1078 if (!(prev_complaints & COMP_DUP)) { 1079 complaints |= COMP_DUP; 1080 msglog("%s (%s%s%s) is duplicated by" 1081 " %s (%s%s%s)", 1082 ifs.int_name, 1083 addrname(ifs.int_addr,ifs.int_mask,1), 1084 ((ifs.int_if_flags & IFF_POINTOPOINT) 1085 ? "-->" : ""), 1086 ((ifs.int_if_flags & IFF_POINTOPOINT) 1087 ? naddr_ntoa(ifs.int_dstaddr) : ""), 1088 ifp->int_name, 1089 addrname(ifp->int_addr,ifp->int_mask,1), 1090 ((ifp->int_if_flags & IFF_POINTOPOINT) 1091 ? "-->" : ""), 1092 ((ifp->int_if_flags & IFF_POINTOPOINT) 1093 ? naddr_ntoa(ifp->int_dstaddr) : "")); 1094 } 1095 ifp->int_state |= IS_DUP; 1096 continue; 1097 } 1098 1099 if (0 == (ifs.int_if_flags & (IFF_POINTOPOINT | IFF_BROADCAST)) 1100 && !(ifs.int_state & IS_PASSIVE)) { 1101 trace_act("%s is neither broadcast, point-to-point," 1102 " nor loopback", 1103 ifs.int_name); 1104 if (!(ifs.int_state & IFF_MULTICAST)) 1105 ifs.int_state |= IS_NO_RDISC; 1106 } 1107 1108 1109 /* It is new and ok. Add it to the list of interfaces 1110 */ 1111 ifp = (struct interface *)rtmalloc(sizeof(*ifp), "ifinit ifp"); 1112 memcpy(ifp, &ifs, sizeof(*ifp)); 1113 get_parms(ifp); 1114 if_link(ifp); 1115 trace_if("Add", ifp); 1116 1117 /* Notice likely bad netmask. 1118 */ 1119 if (!(prev_complaints & COMP_NETMASK) 1120 && !(ifp->int_if_flags & IFF_POINTOPOINT) 1121 && ifp->int_addr != RIP_DEFAULT) { 1122 for (ifp1 = ifnet; NULL != ifp1; ifp1 = ifp1->int_next) { 1123 if (ifp1->int_mask == ifp->int_mask) 1124 continue; 1125 if (ifp1->int_if_flags & IFF_POINTOPOINT) 1126 continue; 1127 if (ifp1->int_dstaddr == RIP_DEFAULT) 1128 continue; 1129 /* ignore aliases on the right network */ 1130 if (!strcmp(ifp->int_name, ifp1->int_name)) 1131 continue; 1132 if (on_net(ifp->int_dstaddr, 1133 ifp1->int_net, ifp1->int_mask) 1134 || on_net(ifp1->int_dstaddr, 1135 ifp->int_net, ifp->int_mask)) { 1136 msglog("possible netmask problem" 1137 " between %s:%s and %s:%s", 1138 ifp->int_name, 1139 addrname(htonl(ifp->int_net), 1140 ifp->int_mask, 1), 1141 ifp1->int_name, 1142 addrname(htonl(ifp1->int_net), 1143 ifp1->int_mask, 1)); 1144 complaints |= COMP_NETMASK; 1145 } 1146 } 1147 } 1148 1149 if (!(ifp->int_state & IS_ALIAS)) { 1150 /* Count the # of directly connected networks. 1151 */ 1152 if (!(ifp->int_if_flags & IFF_LOOPBACK)) 1153 tot_interfaces++; 1154 if (!IS_RIP_OFF(ifp->int_state)) 1155 rip_interfaces++; 1156 1157 /* turn on router discovery and RIP If needed */ 1158 if_ok_rdisc(ifp); 1159 rip_on(ifp); 1160 } 1161 } 1162 1163 /* If we are multi-homed and have at least two interfaces 1164 * listening to RIP, then output by default. 1165 */ 1166 if (!supplier_set && rip_interfaces > 1) 1167 set_supplier(); 1168 1169 /* If we are multi-homed, optionally advertise a route to 1170 * our main address. 1171 */ 1172 if (advertise_mhome 1173 || (tot_interfaces > 1 1174 && mhome 1175 && (ifp = ifwithaddr(myaddr, 0, 0)) != NULL 1176 && foundloopback)) { 1177 advertise_mhome = 1; 1178 rt = rtget(myaddr, HOST_MASK); 1179 if (rt != NULL) { 1180 if (rt->rt_ifp != ifp 1181 || rt->rt_router != loopaddr) { 1182 rtdelete(rt); 1183 rt = NULL; 1184 } else { 1185 loop_rts.rts_ifp = ifp; 1186 loop_rts.rts_metric = 0; 1187 loop_rts.rts_time = rt->rt_time; 1188 rtchange(rt, rt->rt_state | RS_MHOME, 1189 &loop_rts, 0); 1190 } 1191 } 1192 if (rt == NULL) { 1193 loop_rts.rts_ifp = ifp; 1194 loop_rts.rts_metric = 0; 1195 rtadd(myaddr, HOST_MASK, RS_MHOME, &loop_rts); 1196 } 1197 } 1198 1199 for (ifp = ifnet; ifp != NULL; ifp = ifp1) { 1200 ifp1 = ifp->int_next; /* because we may delete it */ 1201 1202 /* Forget any interfaces that have disappeared. 1203 */ 1204 if (!(ifp->int_state & (IS_CHECKED | IS_REMOTE))) { 1205 trace_act("interface %s has disappeared", 1206 ifp->int_name); 1207 ifdel(ifp); 1208 continue; 1209 } 1210 1211 if ((ifp->int_state & IS_BROKE) 1212 && !(ifp->int_state & IS_PASSIVE)) 1213 LIM_SEC(ifinit_timer, now.tv_sec+CHECK_BAD_INTERVAL); 1214 1215 /* If we ever have a RIPv1 interface, assume we always will. 1216 * It might come back if it ever goes away. 1217 */ 1218 if (!(ifp->int_state & IS_NO_RIPV1_OUT) && supplier) 1219 have_ripv1_out = 1; 1220 if (!(ifp->int_state & IS_NO_RIPV1_IN)) 1221 have_ripv1_in = 1; 1222 } 1223 1224 for (ifp = ifnet; ifp != NULL; ifp = ifp->int_next) { 1225 /* Ensure there is always a network route for interfaces, 1226 * after any dead interfaces have been deleted, which 1227 * might affect routes for point-to-point links. 1228 */ 1229 if (!addrouteforif(ifp)) 1230 continue; 1231 1232 /* Add routes to the local end of point-to-point interfaces 1233 * using loopback. 1234 */ 1235 if ((ifp->int_if_flags & IFF_POINTOPOINT) 1236 && !(ifp->int_state & IS_REMOTE) 1237 && foundloopback) { 1238 /* Delete any routes to the network address through 1239 * foreign routers. Remove even static routes. 1240 */ 1241 del_static(ifp->int_addr, HOST_MASK, 0, 0); 1242 rt = rtget(ifp->int_addr, HOST_MASK); 1243 if (rt != NULL && rt->rt_router != loopaddr) { 1244 rtdelete(rt); 1245 rt = NULL; 1246 } 1247 if (rt != NULL) { 1248 if (!(rt->rt_state & RS_LOCAL) 1249 || rt->rt_metric > ifp->int_metric) { 1250 ifp1 = ifp; 1251 } else { 1252 ifp1 = rt->rt_ifp; 1253 } 1254 loop_rts.rts_ifp = ifp1; 1255 loop_rts.rts_metric = 0; 1256 loop_rts.rts_time = rt->rt_time; 1257 rtchange(rt, ((rt->rt_state & ~RS_NET_SYN) 1258 | (RS_IF|RS_LOCAL)), 1259 &loop_rts, 0); 1260 } else { 1261 loop_rts.rts_ifp = ifp; 1262 loop_rts.rts_metric = 0; 1263 rtadd(ifp->int_addr, HOST_MASK, 1264 (RS_IF | RS_LOCAL), &loop_rts); 1265 } 1266 } 1267 } 1268 1269 /* add the authority routes */ 1270 for (intnetp = intnets; intnetp!=NULL; intnetp = intnetp->intnet_next) { 1271 rt = rtget(intnetp->intnet_addr, intnetp->intnet_mask); 1272 if (rt != NULL 1273 && !(rt->rt_state & RS_NO_NET_SYN) 1274 && !(rt->rt_state & RS_NET_INT)) { 1275 rtdelete(rt); 1276 rt = NULL; 1277 } 1278 if (rt == NULL) { 1279 loop_rts.rts_ifp = 0; 1280 loop_rts.rts_metric = intnetp->intnet_metric-1; 1281 rtadd(intnetp->intnet_addr, intnetp->intnet_mask, 1282 RS_NET_SYN | RS_NET_INT, &loop_rts); 1283 } 1284 } 1285 1286 prev_complaints = complaints; 1287 } 1288 1289 1290 static void 1291 check_net_syn(struct interface *ifp) 1292 { 1293 struct rt_entry *rt; 1294 static struct rt_spare new; 1295 1296 1297 /* Turn on the need to automatically synthesize a network route 1298 * for this interface only if we are running RIPv1 on some other 1299 * interface that is on a different class-A,B,or C network. 1300 */ 1301 if (have_ripv1_out || have_ripv1_in) { 1302 ifp->int_state |= IS_NEED_NET_SYN; 1303 rt = rtget(ifp->int_std_addr, ifp->int_std_mask); 1304 if (rt != NULL 1305 && 0 == (rt->rt_state & RS_NO_NET_SYN) 1306 && (!(rt->rt_state & RS_NET_SYN) 1307 || rt->rt_metric > ifp->int_metric)) { 1308 rtdelete(rt); 1309 rt = NULL; 1310 } 1311 if (rt == NULL) { 1312 new.rts_ifp = ifp; 1313 new.rts_gate = ifp->int_addr; 1314 new.rts_router = ifp->int_addr; 1315 new.rts_metric = ifp->int_metric; 1316 rtadd(ifp->int_std_addr, ifp->int_std_mask, 1317 RS_NET_SYN, &new); 1318 } 1319 1320 } else { 1321 ifp->int_state &= ~IS_NEED_NET_SYN; 1322 1323 rt = rtget(ifp->int_std_addr, 1324 ifp->int_std_mask); 1325 if (rt != NULL 1326 && (rt->rt_state & RS_NET_SYN) 1327 && rt->rt_ifp == ifp) 1328 rtbad_sub(rt); 1329 } 1330 } 1331 1332 1333 /* Add route for interface if not currently installed. 1334 * Create route to other end if a point-to-point link, 1335 * otherwise a route to this (sub)network. 1336 */ 1337 int /* 0=bad interface */ 1338 addrouteforif(struct interface *ifp) 1339 { 1340 struct rt_entry *rt; 1341 static struct rt_spare new; 1342 naddr dst; 1343 1344 1345 /* skip sick interfaces 1346 */ 1347 if (ifp->int_state & IS_BROKE) 1348 return 0; 1349 1350 /* If the interface on a subnet, then install a RIPv1 route to 1351 * the network as well (unless it is sick). 1352 */ 1353 if (ifp->int_state & IS_SUBNET) 1354 check_net_syn(ifp); 1355 1356 dst = (0 != (ifp->int_if_flags & (IFF_POINTOPOINT | IFF_LOOPBACK)) 1357 ? ifp->int_dstaddr 1358 : htonl(ifp->int_net)); 1359 1360 new.rts_ifp = ifp; 1361 new.rts_router = ifp->int_addr; 1362 new.rts_gate = ifp->int_addr; 1363 new.rts_metric = ifp->int_metric; 1364 new.rts_time = now.tv_sec; 1365 1366 /* If we are going to send packets to the gateway, 1367 * it must be reachable using our physical interfaces 1368 */ 1369 if ((ifp->int_state & IS_REMOTE) 1370 && !(ifp->int_state & IS_EXTERNAL) 1371 && !check_remote(ifp)) 1372 return 0; 1373 1374 /* We are finished if the correct main interface route exists. 1375 * The right route must be for the right interface, not synthesized 1376 * from a subnet, be a "gateway" or not as appropriate, and so forth. 1377 */ 1378 del_static(dst, ifp->int_mask, 0, 0); 1379 rt = rtget(dst, ifp->int_mask); 1380 if (rt != NULL) { 1381 if ((rt->rt_ifp != ifp 1382 || rt->rt_router != ifp->int_addr) 1383 && (!(ifp->int_state & IS_DUP) 1384 || rt->rt_ifp == 0 1385 || (rt->rt_ifp->int_state & IS_BROKE))) { 1386 rtdelete(rt); 1387 rt = NULL; 1388 } else { 1389 rtchange(rt, ((rt->rt_state | RS_IF) 1390 & ~(RS_NET_SYN | RS_LOCAL)), 1391 &new, 0); 1392 } 1393 } 1394 if (rt == NULL) { 1395 if (ifp->int_transitions++ > 0) 1396 trace_act("re-install interface %s", 1397 ifp->int_name); 1398 1399 rtadd(dst, ifp->int_mask, RS_IF, &new); 1400 } 1401 1402 return 1; 1403 } 1404