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 * 4. Neither the name of the University nor the names of its contributors 14 * may be used to endorse or promote products derived from this software 15 * without specific prior written permission. 16 * 17 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND 18 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 19 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 20 * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE 21 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 22 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 23 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 24 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 25 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 26 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 27 * SUCH DAMAGE. 28 * 29 * $FreeBSD$ 30 */ 31 32 #include "defs.h" 33 #include "pathnames.h" 34 35 #ifdef __NetBSD__ 36 __RCSID("$NetBSD$"); 37 #elif defined(__FreeBSD__) 38 __RCSID("$FreeBSD$"); 39 #else 40 __RCSID("$Revision: 2.27 $"); 41 #ident "$Revision: 2.27 $" 42 #endif 43 44 struct interface *ifnet; /* all interfaces */ 45 46 /* hash table for all interfaces, big enough to tolerate ridiculous 47 * numbers of IP aliases. Crazy numbers of aliases such as 7000 48 * still will not do well, but not just in looking up interfaces 49 * by name or address. 50 */ 51 #define AHASH_LEN 211 /* must be prime */ 52 #define AHASH(a) &ahash_tbl[(a)%AHASH_LEN] 53 struct interface *ahash_tbl[AHASH_LEN]; 54 55 #define BHASH_LEN 211 /* must be prime */ 56 #define BHASH(a) &bhash_tbl[(a)%BHASH_LEN] 57 struct interface *bhash_tbl[BHASH_LEN]; 58 59 struct interface *remote_if; /* remote interfaces */ 60 61 /* hash for physical interface names. 62 * Assume there are never more 100 or 200 real interfaces, and that 63 * aliases are put on the end of the hash chains. 64 */ 65 #define NHASH_LEN 97 66 struct interface *nhash_tbl[NHASH_LEN]; 67 68 int tot_interfaces; /* # of remote and local interfaces */ 69 int rip_interfaces; /* # of interfaces doing RIP */ 70 int foundloopback; /* valid flag for loopaddr */ 71 naddr loopaddr; /* our address on loopback */ 72 struct rt_spare loop_rts; 73 74 struct timeval ifinit_timer; 75 static struct timeval last_ifinit; 76 #define IF_RESCAN_DELAY() (last_ifinit.tv_sec == now.tv_sec \ 77 && last_ifinit.tv_usec == now.tv_usec \ 78 && timercmp(&ifinit_timer, &now, >)) 79 80 int have_ripv1_out; /* have a RIPv1 interface */ 81 int have_ripv1_in; 82 83 84 static struct interface** 85 nhash(char *p) 86 { 87 u_int i; 88 89 for (i = 0; *p != '\0'; p++) { 90 i = ((i<<1) & 0x7fffffff) | ((i>>31) & 1); 91 i ^= *p; 92 } 93 return &nhash_tbl[i % NHASH_LEN]; 94 } 95 96 97 /* Link a new interface into the lists and hash tables. 98 */ 99 void 100 if_link(struct interface *ifp) 101 { 102 struct interface **hifp; 103 104 ifp->int_prev = &ifnet; 105 ifp->int_next = ifnet; 106 if (ifnet != 0) 107 ifnet->int_prev = &ifp->int_next; 108 ifnet = ifp; 109 110 hifp = AHASH(ifp->int_addr); 111 ifp->int_ahash_prev = hifp; 112 if ((ifp->int_ahash = *hifp) != 0) 113 (*hifp)->int_ahash_prev = &ifp->int_ahash; 114 *hifp = ifp; 115 116 if (ifp->int_if_flags & IFF_BROADCAST) { 117 hifp = BHASH(ifp->int_brdaddr); 118 ifp->int_bhash_prev = hifp; 119 if ((ifp->int_bhash = *hifp) != 0) 120 (*hifp)->int_bhash_prev = &ifp->int_bhash; 121 *hifp = ifp; 122 } 123 124 if (ifp->int_state & IS_REMOTE) { 125 ifp->int_rlink_prev = &remote_if; 126 ifp->int_rlink = remote_if; 127 if (remote_if != 0) 128 remote_if->int_rlink_prev = &ifp->int_rlink; 129 remote_if = ifp; 130 } 131 132 hifp = nhash(ifp->int_name); 133 if (ifp->int_state & IS_ALIAS) { 134 /* put aliases on the end of the hash chain */ 135 while (*hifp != 0) 136 hifp = &(*hifp)->int_nhash; 137 } 138 ifp->int_nhash_prev = hifp; 139 if ((ifp->int_nhash = *hifp) != 0) 140 (*hifp)->int_nhash_prev = &ifp->int_nhash; 141 *hifp = ifp; 142 } 143 144 145 /* Find the interface with an address 146 */ 147 struct interface * 148 ifwithaddr(naddr addr, 149 int bcast, /* notice IFF_BROADCAST address */ 150 int remote) /* include IS_REMOTE interfaces */ 151 { 152 struct interface *ifp, *possible = 0; 153 154 remote = (remote == 0) ? IS_REMOTE : 0; 155 156 for (ifp = *AHASH(addr); ifp; ifp = ifp->int_ahash) { 157 if (ifp->int_addr != addr) 158 continue; 159 if ((ifp->int_state & remote) != 0) 160 continue; 161 if ((ifp->int_state & (IS_BROKE | IS_PASSIVE)) == 0) 162 return ifp; 163 possible = ifp; 164 } 165 166 if (possible || !bcast) 167 return possible; 168 169 for (ifp = *BHASH(addr); ifp; ifp = ifp->int_bhash) { 170 if (ifp->int_brdaddr != addr) 171 continue; 172 if ((ifp->int_state & remote) != 0) 173 continue; 174 if ((ifp->int_state & (IS_BROKE | IS_PASSIVE)) == 0) 175 return ifp; 176 possible = ifp; 177 } 178 179 return possible; 180 } 181 182 183 /* find the interface with a name 184 */ 185 struct interface * 186 ifwithname(char *name, /* "ec0" or whatever */ 187 naddr addr) /* 0 or network address */ 188 { 189 struct interface *ifp; 190 191 for (;;) { 192 for (ifp = *nhash(name); ifp != 0; ifp = ifp->int_nhash) { 193 /* If the network address is not specified, 194 * ignore any alias interfaces. Otherwise, look 195 * for the interface with the target name and address. 196 */ 197 if (!strcmp(ifp->int_name, name) 198 && ((addr == 0 && !(ifp->int_state & IS_ALIAS)) 199 || (ifp->int_addr == addr))) 200 return ifp; 201 } 202 203 /* If there is no known interface, maybe there is a 204 * new interface. So just once look for new interfaces. 205 */ 206 if (IF_RESCAN_DELAY()) 207 return 0; 208 ifinit(); 209 } 210 } 211 212 213 struct interface * 214 ifwithindex(u_short ifindex, 215 int rescan_ok) 216 { 217 struct interface *ifp; 218 219 for (;;) { 220 for (ifp = ifnet; 0 != ifp; ifp = ifp->int_next) { 221 if (ifp->int_index == ifindex) 222 return ifp; 223 } 224 225 /* If there is no known interface, maybe there is a 226 * new interface. So just once look for new interfaces. 227 */ 228 if (!rescan_ok 229 || IF_RESCAN_DELAY()) 230 return 0; 231 ifinit(); 232 } 233 } 234 235 236 /* Find an interface from which the specified address 237 * should have come from. Used for figuring out which 238 * interface a packet came in on. 239 */ 240 struct interface * 241 iflookup(naddr addr) 242 { 243 struct interface *ifp, *maybe; 244 int once = 0; 245 246 maybe = 0; 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 == 0 263 || ifp->int_mask > maybe->int_mask)) 264 maybe = ifp; 265 } 266 } 267 268 if (maybe != 0 || once || IF_RESCAN_DELAY()) 269 return maybe; 270 once = 1; 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 != 0 && 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 != 0; 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 != 0; 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 an 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; 0 != 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_state & IS_REMOTE) || !(if_flags & IS_REMOTE)) 408 && ifp->int_addr == addr 409 && (((if_flags|ifp->int_if_flags) & IFF_POINTOPOINT) == 0)) 410 return ifp; 411 412 if (on_net(ifp->int_dstaddr, ntohl(dstaddr),mask)) 413 return ifp; 414 } 415 return 0; 416 } 417 418 419 /* See that a remote gateway is reachable. 420 * Note that the answer can change as real interfaces come and go. 421 */ 422 int /* 0=bad */ 423 check_remote(struct interface *ifp) 424 { 425 struct rt_entry *rt; 426 427 /* do not worry about other kinds */ 428 if (!(ifp->int_state & IS_REMOTE)) 429 return 1; 430 431 rt = rtfind(ifp->int_addr); 432 if (rt != 0 433 && rt->rt_ifp != 0 434 &&on_net(ifp->int_addr, 435 rt->rt_ifp->int_net, rt->rt_ifp->int_mask)) 436 return 1; 437 438 /* the gateway cannot be reached directly from one of our 439 * interfaces 440 */ 441 if (!(ifp->int_state & IS_BROKE)) { 442 msglog("unreachable gateway %s in "_PATH_GATEWAYS, 443 naddr_ntoa(ifp->int_addr)); 444 if_bad(ifp); 445 } 446 return 0; 447 } 448 449 450 /* Delete an interface. 451 */ 452 static void 453 ifdel(struct interface *ifp) 454 { 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; 0 != 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) && rip_sock >= 0) { 494 struct group_req gr; 495 struct sockaddr_in *sin; 496 497 memset(&gr, 0, sizeof(gr)); 498 gr.gr_interface = ifp->int_index; 499 sin = (struct sockaddr_in *)&gr.gr_group; 500 sin->sin_family = AF_INET; 501 #ifdef _HAVE_SIN_LEN 502 sin->sin_len = sizeof(struct sockaddr_in); 503 #endif 504 sin->sin_addr.s_addr = htonl(INADDR_RIP_GROUP); 505 if (setsockopt(rip_sock, IPPROTO_IP, MCAST_LEAVE_GROUP, 506 &gr, sizeof(gr)) < 0 507 && errno != EADDRNOTAVAIL 508 && !TRACEACTIONS) 509 LOGERR("setsockopt(MCAST_LEAVE_GROUP RIP)"); 510 if (rip_sock_mcast == ifp) 511 rip_sock_mcast = 0; 512 } 513 if (ifp->int_rip_sock >= 0) { 514 (void)close(ifp->int_rip_sock); 515 ifp->int_rip_sock = -1; 516 fix_select(); 517 } 518 519 tot_interfaces--; 520 if (!IS_RIP_OFF(ifp->int_state)) 521 rip_interfaces--; 522 523 /* Zap all routes associated with this interface. 524 * Assume routes just using gateways beyond this interface 525 * will timeout naturally, and have probably already died. 526 */ 527 (void)rn_walktree(rhead, walk_bad, 0); 528 529 set_rdisc_mg(ifp, 0); 530 if_bad_rdisc(ifp); 531 } 532 533 free(ifp); 534 } 535 536 537 /* Mark an interface ill. 538 */ 539 void 540 if_sick(struct interface *ifp) 541 { 542 if (0 == (ifp->int_state & (IS_SICK | IS_BROKE))) { 543 ifp->int_state |= IS_SICK; 544 ifp->int_act_time = NEVER; 545 trace_if("Chg", ifp); 546 547 LIM_SEC(ifinit_timer, now.tv_sec+CHECK_BAD_INTERVAL); 548 } 549 } 550 551 552 /* Mark an interface dead. 553 */ 554 void 555 if_bad(struct interface *ifp) 556 { 557 struct interface *ifp1; 558 559 560 if (ifp->int_state & IS_BROKE) 561 return; 562 563 LIM_SEC(ifinit_timer, now.tv_sec+CHECK_BAD_INTERVAL); 564 565 ifp->int_state |= (IS_BROKE | IS_SICK); 566 ifp->int_act_time = NEVER; 567 ifp->int_query_time = NEVER; 568 ifp->int_data.ts = now.tv_sec; 569 570 trace_if("Chg", ifp); 571 572 if (!(ifp->int_state & IS_ALIAS)) { 573 for (ifp1 = ifnet; 0 != ifp1; ifp1 = ifp1->int_next) { 574 if (ifp1 != ifp 575 && !strcmp(ifp->int_name, ifp1->int_name)) 576 if_bad(ifp1); 577 } 578 (void)rn_walktree(rhead, walk_bad, 0); 579 if_bad_rdisc(ifp); 580 } 581 } 582 583 584 /* Mark an interface alive 585 */ 586 int /* 1=it was dead */ 587 if_ok(struct interface *ifp, 588 const char *type) 589 { 590 struct interface *ifp1; 591 592 593 if (!(ifp->int_state & IS_BROKE)) { 594 if (ifp->int_state & IS_SICK) { 595 trace_act("%sinterface %s to %s working better", 596 type, 597 ifp->int_name, naddr_ntoa(ifp->int_dstaddr)); 598 ifp->int_state &= ~IS_SICK; 599 } 600 return 0; 601 } 602 603 msglog("%sinterface %s to %s restored", 604 type, ifp->int_name, naddr_ntoa(ifp->int_dstaddr)); 605 ifp->int_state &= ~(IS_BROKE | IS_SICK); 606 ifp->int_data.ts = 0; 607 608 if (!(ifp->int_state & IS_ALIAS)) { 609 for (ifp1 = ifnet; 0 != ifp1; ifp1 = ifp1->int_next) { 610 if (ifp1 != ifp 611 && !strcmp(ifp->int_name, ifp1->int_name)) 612 if_ok(ifp1, type); 613 } 614 if_ok_rdisc(ifp); 615 } 616 617 if (ifp->int_state & IS_REMOTE) { 618 if (!addrouteforif(ifp)) 619 return 0; 620 } 621 return 1; 622 } 623 624 625 /* disassemble routing message 626 */ 627 void 628 rt_xaddrs(struct rt_addrinfo *info, 629 struct sockaddr *sa, 630 struct sockaddr *lim, 631 int addrs) 632 { 633 int i; 634 #ifdef _HAVE_SA_LEN 635 static struct sockaddr sa_zero; 636 #endif 637 638 memset(info, 0, sizeof(*info)); 639 info->rti_addrs = addrs; 640 for (i = 0; i < RTAX_MAX && sa < lim; i++) { 641 if ((addrs & (1 << i)) == 0) 642 continue; 643 info->rti_info[i] = (sa->sa_len != 0) ? sa : &sa_zero; 644 sa = (struct sockaddr *)((char*)(sa) + SA_SIZE(sa)); 645 } 646 } 647 648 649 /* Find the network interfaces which have configured themselves. 650 * This must be done regularly, if only for extra addresses 651 * that come and go on interfaces. 652 */ 653 void 654 ifinit(void) 655 { 656 static char *sysctl_buf; 657 static size_t sysctl_buf_size = 0; 658 uint complaints = 0; 659 static u_int prev_complaints = 0; 660 # define COMP_NOT_INET 0x001 661 # define COMP_NOADDR 0x002 662 # define COMP_BADADDR 0x004 663 # define COMP_NODST 0x008 664 # define COMP_NOBADR 0x010 665 # define COMP_NOMASK 0x020 666 # define COMP_DUP 0x040 667 # define COMP_BAD_METRIC 0x080 668 # define COMP_NETMASK 0x100 669 670 struct interface ifs, ifs0, *ifp, *ifp1; 671 struct rt_entry *rt; 672 size_t needed; 673 int mib[6]; 674 struct if_msghdr *ifm; 675 struct ifa_msghdr *ifam, *ifam_lim, *ifam2; 676 int in, ierr, out, oerr; 677 struct intnet *intnetp; 678 struct rt_addrinfo info; 679 #ifdef SIOCGIFMETRIC 680 struct ifreq ifr; 681 #endif 682 683 684 last_ifinit = now; 685 ifinit_timer.tv_sec = now.tv_sec + (supplier 686 ? CHECK_ACT_INTERVAL 687 : CHECK_QUIET_INTERVAL); 688 689 /* mark all interfaces so we can get rid of those that disappear */ 690 for (ifp = ifnet; 0 != ifp; ifp = ifp->int_next) 691 ifp->int_state &= ~(IS_CHECKED | IS_DUP); 692 693 /* Fetch the interface list, without too many system calls 694 * since we do it repeatedly. 695 */ 696 mib[0] = CTL_NET; 697 mib[1] = PF_ROUTE; 698 mib[2] = 0; 699 mib[3] = AF_INET; 700 mib[4] = NET_RT_IFLIST; 701 mib[5] = 0; 702 for (;;) { 703 if ((needed = sysctl_buf_size) != 0) { 704 if (sysctl(mib, 6, sysctl_buf,&needed, 0, 0) >= 0) 705 break; 706 /* retry if the table grew */ 707 if (errno != ENOMEM && errno != EFAULT) 708 BADERR(1, "ifinit: sysctl(RT_IFLIST)"); 709 free(sysctl_buf); 710 needed = 0; 711 } 712 if (sysctl(mib, 6, 0, &needed, 0, 0) < 0) 713 BADERR(1,"ifinit: sysctl(RT_IFLIST) estimate"); 714 sysctl_buf = rtmalloc(sysctl_buf_size = needed, 715 "ifinit sysctl"); 716 } 717 718 ifam_lim = (struct ifa_msghdr *)(sysctl_buf + needed); 719 for (ifam = (struct ifa_msghdr *)sysctl_buf; 720 ifam < ifam_lim; 721 ifam = ifam2) { 722 723 ifam2 = (struct ifa_msghdr*)((char*)ifam + ifam->ifam_msglen); 724 725 #ifdef RTM_OIFINFO 726 if (ifam->ifam_type == RTM_OIFINFO) 727 continue; /* just ignore compat message */ 728 #endif 729 if (ifam->ifam_type == RTM_IFINFO) { 730 struct sockaddr_dl *sdl; 731 732 ifm = (struct if_msghdr *)ifam; 733 /* make prototype structure for the IP aliases 734 */ 735 memset(&ifs0, 0, sizeof(ifs0)); 736 ifs0.int_rip_sock = -1; 737 ifs0.int_index = ifm->ifm_index; 738 ifs0.int_if_flags = ifm->ifm_flags; 739 ifs0.int_state = IS_CHECKED; 740 ifs0.int_query_time = NEVER; 741 ifs0.int_act_time = now.tv_sec; 742 ifs0.int_data.ts = now.tv_sec; 743 ifs0.int_data.ipackets = ifm->ifm_data.ifi_ipackets; 744 ifs0.int_data.ierrors = ifm->ifm_data.ifi_ierrors; 745 ifs0.int_data.opackets = ifm->ifm_data.ifi_opackets; 746 ifs0.int_data.oerrors = ifm->ifm_data.ifi_oerrors; 747 #ifdef sgi 748 ifs0.int_data.odrops = ifm->ifm_data.ifi_odrops; 749 #endif 750 sdl = (struct sockaddr_dl *)(ifm + 1); 751 sdl->sdl_data[sdl->sdl_nlen] = 0; 752 strncpy(ifs0.int_name, sdl->sdl_data, 753 MIN(sizeof(ifs0.int_name), sdl->sdl_nlen)); 754 continue; 755 } 756 if (ifam->ifam_type != RTM_NEWADDR) { 757 logbad(1,"ifinit: out of sync"); 758 continue; 759 } 760 rt_xaddrs(&info, (struct sockaddr *)(ifam+1), 761 (struct sockaddr *)ifam2, 762 ifam->ifam_addrs); 763 764 /* Prepare for the next address of this interface, which 765 * will be an alias. 766 * Do not output RIP or Router-Discovery packets via aliases. 767 */ 768 memcpy(&ifs, &ifs0, sizeof(ifs)); 769 ifs0.int_state |= (IS_ALIAS | IS_NO_RIP_OUT | IS_NO_RDISC); 770 771 if (INFO_IFA(&info) == 0) { 772 if (iff_up(ifs.int_if_flags)) { 773 if (!(prev_complaints & COMP_NOADDR)) 774 msglog("%s has no address", 775 ifs.int_name); 776 complaints |= COMP_NOADDR; 777 } 778 continue; 779 } 780 if (INFO_IFA(&info)->sa_family != AF_INET) { 781 if (iff_up(ifs.int_if_flags)) { 782 if (!(prev_complaints & COMP_NOT_INET)) 783 trace_act("%s: not AF_INET", 784 ifs.int_name); 785 complaints |= COMP_NOT_INET; 786 } 787 continue; 788 } 789 790 ifs.int_addr = S_ADDR(INFO_IFA(&info)); 791 792 if (ntohl(ifs.int_addr)>>24 == 0 793 || ntohl(ifs.int_addr)>>24 == 0xff) { 794 if (iff_up(ifs.int_if_flags)) { 795 if (!(prev_complaints & COMP_BADADDR)) 796 msglog("%s has a bad address", 797 ifs.int_name); 798 complaints |= COMP_BADADDR; 799 } 800 continue; 801 } 802 803 if (ifs.int_if_flags & IFF_LOOPBACK) { 804 ifs.int_state |= IS_NO_RIP | IS_NO_RDISC; 805 if (ifs.int_addr == htonl(INADDR_LOOPBACK)) 806 ifs.int_state |= IS_PASSIVE; 807 ifs.int_dstaddr = ifs.int_addr; 808 ifs.int_mask = HOST_MASK; 809 ifs.int_ripv1_mask = HOST_MASK; 810 ifs.int_std_mask = std_mask(ifs.int_dstaddr); 811 ifs.int_net = ntohl(ifs.int_dstaddr); 812 if (!foundloopback) { 813 foundloopback = 1; 814 loopaddr = ifs.int_addr; 815 loop_rts.rts_gate = loopaddr; 816 loop_rts.rts_router = loopaddr; 817 } 818 819 } else if (ifs.int_if_flags & IFF_POINTOPOINT) { 820 if (INFO_BRD(&info) == 0 821 || INFO_BRD(&info)->sa_family != AF_INET) { 822 if (iff_up(ifs.int_if_flags)) { 823 if (!(prev_complaints & COMP_NODST)) 824 msglog("%s has a bad" 825 " destination address", 826 ifs.int_name); 827 complaints |= COMP_NODST; 828 } 829 continue; 830 } 831 ifs.int_dstaddr = S_ADDR(INFO_BRD(&info)); 832 if (ntohl(ifs.int_dstaddr)>>24 == 0 833 || ntohl(ifs.int_dstaddr)>>24 == 0xff) { 834 if (iff_up(ifs.int_if_flags)) { 835 if (!(prev_complaints & COMP_NODST)) 836 msglog("%s has a bad" 837 " destination address", 838 ifs.int_name); 839 complaints |= COMP_NODST; 840 } 841 continue; 842 } 843 ifs.int_mask = HOST_MASK; 844 ifs.int_ripv1_mask = ntohl(S_ADDR(INFO_MASK(&info))); 845 ifs.int_std_mask = std_mask(ifs.int_dstaddr); 846 ifs.int_net = ntohl(ifs.int_dstaddr); 847 848 } else { 849 if (INFO_MASK(&info) == 0) { 850 if (iff_up(ifs.int_if_flags)) { 851 if (!(prev_complaints & COMP_NOMASK)) 852 msglog("%s has no netmask", 853 ifs.int_name); 854 complaints |= COMP_NOMASK; 855 } 856 continue; 857 } 858 ifs.int_dstaddr = ifs.int_addr; 859 ifs.int_mask = ntohl(S_ADDR(INFO_MASK(&info))); 860 ifs.int_ripv1_mask = ifs.int_mask; 861 ifs.int_std_mask = std_mask(ifs.int_addr); 862 ifs.int_net = ntohl(ifs.int_addr) & ifs.int_mask; 863 if (ifs.int_mask != ifs.int_std_mask) 864 ifs.int_state |= IS_SUBNET; 865 866 if (ifs.int_if_flags & IFF_BROADCAST) { 867 if (INFO_BRD(&info) == 0) { 868 if (iff_up(ifs.int_if_flags)) { 869 if (!(prev_complaints 870 & COMP_NOBADR)) 871 msglog("%s has" 872 "no broadcast address", 873 ifs.int_name); 874 complaints |= COMP_NOBADR; 875 } 876 continue; 877 } 878 ifs.int_brdaddr = S_ADDR(INFO_BRD(&info)); 879 } 880 } 881 ifs.int_std_net = ifs.int_net & ifs.int_std_mask; 882 ifs.int_std_addr = htonl(ifs.int_std_net); 883 884 /* Use a minimum metric of one. Treat the interface metric 885 * (default 0) as an increment to the hop count of one. 886 * 887 * The metric obtained from the routing socket dump of 888 * interface addresses is wrong. It is not set by the 889 * SIOCSIFMETRIC ioctl. 890 */ 891 #ifdef SIOCGIFMETRIC 892 strncpy(ifr.ifr_name, ifs.int_name, sizeof(ifr.ifr_name)); 893 if (ioctl(rt_sock, SIOCGIFMETRIC, &ifr) < 0) { 894 DBGERR(1, "ioctl(SIOCGIFMETRIC)"); 895 ifs.int_metric = 0; 896 } else { 897 ifs.int_metric = ifr.ifr_metric; 898 } 899 #else 900 ifs.int_metric = ifam->ifam_metric; 901 #endif 902 if (ifs.int_metric > HOPCNT_INFINITY) { 903 ifs.int_metric = 0; 904 if (!(prev_complaints & COMP_BAD_METRIC) 905 && iff_up(ifs.int_if_flags)) { 906 complaints |= COMP_BAD_METRIC; 907 msglog("%s has a metric of %d", 908 ifs.int_name, ifs.int_metric); 909 } 910 } 911 912 /* See if this is a familiar interface. 913 * If so, stop worrying about it if it is the same. 914 * Start it over if it now is to somewhere else, as happens 915 * frequently with PPP and SLIP. 916 */ 917 ifp = ifwithname(ifs.int_name, ((ifs.int_state & IS_ALIAS) 918 ? ifs.int_addr 919 : 0)); 920 if (ifp != 0) { 921 ifp->int_state |= IS_CHECKED; 922 923 if (0 != ((ifp->int_if_flags ^ ifs.int_if_flags) 924 & (IFF_BROADCAST 925 | IFF_LOOPBACK 926 | IFF_POINTOPOINT 927 | IFF_MULTICAST)) 928 || 0 != ((ifp->int_state ^ ifs.int_state) 929 & IS_ALIAS) 930 || ifp->int_addr != ifs.int_addr 931 || ifp->int_brdaddr != ifs.int_brdaddr 932 || ifp->int_dstaddr != ifs.int_dstaddr 933 || ifp->int_mask != ifs.int_mask 934 || ifp->int_metric != ifs.int_metric) { 935 /* Forget old information about 936 * a changed interface. 937 */ 938 trace_act("interface %s has changed", 939 ifp->int_name); 940 ifdel(ifp); 941 ifp = 0; 942 } 943 } 944 945 if (ifp != 0) { 946 /* The primary representative of an alias worries 947 * about how things are working. 948 */ 949 if (ifp->int_state & IS_ALIAS) 950 continue; 951 952 /* note interfaces that have been turned off 953 */ 954 if (!iff_up(ifs.int_if_flags)) { 955 if (iff_up(ifp->int_if_flags)) { 956 msglog("interface %s to %s turned off", 957 ifp->int_name, 958 naddr_ntoa(ifp->int_dstaddr)); 959 if_bad(ifp); 960 ifp->int_if_flags &= ~IFF_UP; 961 } else if (now.tv_sec>(ifp->int_data.ts 962 + CHECK_BAD_INTERVAL)) { 963 trace_act("interface %s has been off" 964 " %ld seconds; forget it", 965 ifp->int_name, 966 now.tv_sec-ifp->int_data.ts); 967 ifdel(ifp); 968 } 969 continue; 970 } 971 /* or that were off and are now ok */ 972 if (!iff_up(ifp->int_if_flags)) { 973 ifp->int_if_flags |= IFF_UP; 974 (void)if_ok(ifp, ""); 975 } 976 977 /* If it has been long enough, 978 * see if the interface is broken. 979 */ 980 if (now.tv_sec < ifp->int_data.ts+CHECK_BAD_INTERVAL) 981 continue; 982 983 in = ifs.int_data.ipackets - ifp->int_data.ipackets; 984 ierr = ifs.int_data.ierrors - ifp->int_data.ierrors; 985 out = ifs.int_data.opackets - ifp->int_data.opackets; 986 oerr = ifs.int_data.oerrors - ifp->int_data.oerrors; 987 #ifdef sgi 988 /* Through at least IRIX 6.2, PPP and SLIP 989 * count packets dropped by the filters. 990 * But FDDI rings stuck non-operational count 991 * dropped packets as they wait for improvement. 992 */ 993 if (!(ifp->int_if_flags & IFF_POINTOPOINT)) 994 oerr += (ifs.int_data.odrops 995 - ifp->int_data.odrops); 996 #endif 997 /* If the interface just awoke, restart the counters. 998 */ 999 if (ifp->int_data.ts == 0) { 1000 ifp->int_data = ifs.int_data; 1001 continue; 1002 } 1003 ifp->int_data = ifs.int_data; 1004 1005 /* Withhold judgment when the short error 1006 * counters wrap or the interface is reset. 1007 */ 1008 if (ierr < 0 || in < 0 || oerr < 0 || out < 0) { 1009 LIM_SEC(ifinit_timer, 1010 now.tv_sec+CHECK_BAD_INTERVAL); 1011 continue; 1012 } 1013 1014 /* Withhold judgement when there is no traffic 1015 */ 1016 if (in == 0 && out == 0 && ierr == 0 && oerr == 0) 1017 continue; 1018 1019 /* It is bad if input or output is not working. 1020 * Require presistent problems before marking it dead. 1021 */ 1022 if ((in <= ierr && ierr > 0) 1023 || (out <= oerr && oerr > 0)) { 1024 if (!(ifp->int_state & IS_SICK)) { 1025 trace_act("interface %s to %s" 1026 " sick: in=%d ierr=%d" 1027 " out=%d oerr=%d", 1028 ifp->int_name, 1029 naddr_ntoa(ifp->int_dstaddr), 1030 in, ierr, out, oerr); 1031 if_sick(ifp); 1032 continue; 1033 } 1034 if (!(ifp->int_state & IS_BROKE)) { 1035 msglog("interface %s to %s broken:" 1036 " in=%d ierr=%d out=%d oerr=%d", 1037 ifp->int_name, 1038 naddr_ntoa(ifp->int_dstaddr), 1039 in, ierr, out, oerr); 1040 if_bad(ifp); 1041 } 1042 continue; 1043 } 1044 1045 /* otherwise, it is active and healthy 1046 */ 1047 ifp->int_act_time = now.tv_sec; 1048 (void)if_ok(ifp, ""); 1049 continue; 1050 } 1051 1052 /* This is a new interface. 1053 * If it is dead, forget it. 1054 */ 1055 if (!iff_up(ifs.int_if_flags)) 1056 continue; 1057 1058 /* If it duplicates an existing interface, 1059 * complain about it, mark the other one 1060 * duplicated, and forget this one. 1061 */ 1062 ifp = check_dup(ifs.int_addr,ifs.int_dstaddr,ifs.int_mask, 1063 ifs.int_if_flags); 1064 if (ifp != 0) { 1065 /* Ignore duplicates of itself, caused by having 1066 * IP aliases on the same network. 1067 */ 1068 if (!strcmp(ifp->int_name, ifs.int_name)) 1069 continue; 1070 1071 if (!(prev_complaints & COMP_DUP)) { 1072 complaints |= COMP_DUP; 1073 msglog("%s (%s%s%s) is duplicated by" 1074 " %s (%s%s%s)", 1075 ifs.int_name, 1076 addrname(ifs.int_addr,ifs.int_mask,1), 1077 ((ifs.int_if_flags & IFF_POINTOPOINT) 1078 ? "-->" : ""), 1079 ((ifs.int_if_flags & IFF_POINTOPOINT) 1080 ? naddr_ntoa(ifs.int_dstaddr) : ""), 1081 ifp->int_name, 1082 addrname(ifp->int_addr,ifp->int_mask,1), 1083 ((ifp->int_if_flags & IFF_POINTOPOINT) 1084 ? "-->" : ""), 1085 ((ifp->int_if_flags & IFF_POINTOPOINT) 1086 ? naddr_ntoa(ifp->int_dstaddr) : "")); 1087 } 1088 ifp->int_state |= IS_DUP; 1089 continue; 1090 } 1091 1092 if (0 == (ifs.int_if_flags & (IFF_POINTOPOINT | IFF_BROADCAST | IFF_LOOPBACK))) { 1093 trace_act("%s is neither broadcast, point-to-point," 1094 " nor loopback", 1095 ifs.int_name); 1096 if (!(ifs.int_state & IFF_MULTICAST)) 1097 ifs.int_state |= IS_NO_RDISC; 1098 } 1099 1100 1101 /* It is new and ok. Add it to the list of interfaces 1102 */ 1103 ifp = (struct interface *)rtmalloc(sizeof(*ifp), "ifinit ifp"); 1104 memcpy(ifp, &ifs, sizeof(*ifp)); 1105 get_parms(ifp); 1106 if_link(ifp); 1107 trace_if("Add", ifp); 1108 1109 /* Notice likely bad netmask. 1110 */ 1111 if (!(prev_complaints & COMP_NETMASK) 1112 && !(ifp->int_if_flags & IFF_POINTOPOINT) 1113 && ifp->int_addr != RIP_DEFAULT) { 1114 for (ifp1 = ifnet; 0 != ifp1; ifp1 = ifp1->int_next) { 1115 if (ifp1->int_mask == ifp->int_mask) 1116 continue; 1117 if (ifp1->int_if_flags & IFF_POINTOPOINT) 1118 continue; 1119 if (ifp1->int_dstaddr == RIP_DEFAULT) 1120 continue; 1121 /* ignore aliases on the right network */ 1122 if (!strcmp(ifp->int_name, ifp1->int_name)) 1123 continue; 1124 if (on_net(ifp->int_dstaddr, 1125 ifp1->int_net, ifp1->int_mask) 1126 || on_net(ifp1->int_dstaddr, 1127 ifp->int_net, ifp->int_mask)) { 1128 msglog("possible netmask problem" 1129 " between %s:%s and %s:%s", 1130 ifp->int_name, 1131 addrname(htonl(ifp->int_net), 1132 ifp->int_mask, 1), 1133 ifp1->int_name, 1134 addrname(htonl(ifp1->int_net), 1135 ifp1->int_mask, 1)); 1136 complaints |= COMP_NETMASK; 1137 } 1138 } 1139 } 1140 1141 if (!(ifp->int_state & IS_ALIAS)) { 1142 /* Count the # of directly connected networks. 1143 */ 1144 if (!(ifp->int_if_flags & IFF_LOOPBACK)) 1145 tot_interfaces++; 1146 if (!IS_RIP_OFF(ifp->int_state)) 1147 rip_interfaces++; 1148 1149 /* turn on router discovery and RIP If needed */ 1150 if_ok_rdisc(ifp); 1151 rip_on(ifp); 1152 } 1153 } 1154 1155 /* If we are multi-homed and have at least two interfaces 1156 * listening to RIP, then output by default. 1157 */ 1158 if (!supplier_set && rip_interfaces > 1) 1159 set_supplier(); 1160 1161 /* If we are multi-homed, optionally advertise a route to 1162 * our main address. 1163 */ 1164 if (advertise_mhome 1165 || (tot_interfaces > 1 1166 && mhome 1167 && (ifp = ifwithaddr(myaddr, 0, 0)) != 0 1168 && foundloopback)) { 1169 advertise_mhome = 1; 1170 rt = rtget(myaddr, HOST_MASK); 1171 if (rt != 0) { 1172 if (rt->rt_ifp != ifp 1173 || rt->rt_router != loopaddr) { 1174 rtdelete(rt); 1175 rt = 0; 1176 } else { 1177 loop_rts.rts_ifp = ifp; 1178 loop_rts.rts_metric = 0; 1179 loop_rts.rts_time = rt->rt_time; 1180 rtchange(rt, rt->rt_state | RS_MHOME, 1181 &loop_rts, 0); 1182 } 1183 } 1184 if (rt == 0) { 1185 loop_rts.rts_ifp = ifp; 1186 loop_rts.rts_metric = 0; 1187 rtadd(myaddr, HOST_MASK, RS_MHOME, &loop_rts); 1188 } 1189 } 1190 1191 for (ifp = ifnet; ifp != 0; ifp = ifp1) { 1192 ifp1 = ifp->int_next; /* because we may delete it */ 1193 1194 /* Forget any interfaces that have disappeared. 1195 */ 1196 if (!(ifp->int_state & (IS_CHECKED | IS_REMOTE))) { 1197 trace_act("interface %s has disappeared", 1198 ifp->int_name); 1199 ifdel(ifp); 1200 continue; 1201 } 1202 1203 if ((ifp->int_state & IS_BROKE) 1204 && !(ifp->int_state & IS_PASSIVE)) 1205 LIM_SEC(ifinit_timer, now.tv_sec+CHECK_BAD_INTERVAL); 1206 1207 /* If we ever have a RIPv1 interface, assume we always will. 1208 * It might come back if it ever goes away. 1209 */ 1210 if (!(ifp->int_state & IS_NO_RIPV1_OUT) && supplier) 1211 have_ripv1_out = 1; 1212 if (!(ifp->int_state & IS_NO_RIPV1_IN)) 1213 have_ripv1_in = 1; 1214 } 1215 1216 for (ifp = ifnet; ifp != 0; ifp = ifp->int_next) { 1217 /* Ensure there is always a network route for interfaces, 1218 * after any dead interfaces have been deleted, which 1219 * might affect routes for point-to-point links. 1220 */ 1221 if (!addrouteforif(ifp)) 1222 continue; 1223 1224 /* Add routes to the local end of point-to-point interfaces 1225 * using loopback. 1226 */ 1227 if ((ifp->int_if_flags & IFF_POINTOPOINT) 1228 && !(ifp->int_state & IS_REMOTE) 1229 && foundloopback) { 1230 /* Delete any routes to the network address through 1231 * foreign routers. Remove even static routes. 1232 */ 1233 del_static(ifp->int_addr, HOST_MASK, 0, 0); 1234 rt = rtget(ifp->int_addr, HOST_MASK); 1235 if (rt != 0 && rt->rt_router != loopaddr) { 1236 rtdelete(rt); 1237 rt = 0; 1238 } 1239 if (rt != 0) { 1240 if (!(rt->rt_state & RS_LOCAL) 1241 || rt->rt_metric > ifp->int_metric) { 1242 ifp1 = ifp; 1243 } else { 1244 ifp1 = rt->rt_ifp; 1245 } 1246 loop_rts.rts_ifp = ifp1; 1247 loop_rts.rts_metric = 0; 1248 loop_rts.rts_time = rt->rt_time; 1249 rtchange(rt, ((rt->rt_state & ~RS_NET_SYN) 1250 | (RS_IF|RS_LOCAL)), 1251 &loop_rts, 0); 1252 } else { 1253 loop_rts.rts_ifp = ifp; 1254 loop_rts.rts_metric = 0; 1255 rtadd(ifp->int_addr, HOST_MASK, 1256 (RS_IF | RS_LOCAL), &loop_rts); 1257 } 1258 } 1259 } 1260 1261 /* add the authority routes */ 1262 for (intnetp = intnets; intnetp!=0; intnetp = intnetp->intnet_next) { 1263 rt = rtget(intnetp->intnet_addr, intnetp->intnet_mask); 1264 if (rt != 0 1265 && !(rt->rt_state & RS_NO_NET_SYN) 1266 && !(rt->rt_state & RS_NET_INT)) { 1267 rtdelete(rt); 1268 rt = 0; 1269 } 1270 if (rt == 0) { 1271 loop_rts.rts_ifp = 0; 1272 loop_rts.rts_metric = intnetp->intnet_metric-1; 1273 rtadd(intnetp->intnet_addr, intnetp->intnet_mask, 1274 RS_NET_SYN | RS_NET_INT, &loop_rts); 1275 } 1276 } 1277 1278 prev_complaints = complaints; 1279 } 1280 1281 1282 static void 1283 check_net_syn(struct interface *ifp) 1284 { 1285 struct rt_entry *rt; 1286 static struct rt_spare new; 1287 1288 1289 /* Turn on the need to automatically synthesize a network route 1290 * for this interface only if we are running RIPv1 on some other 1291 * interface that is on a different class-A,B,or C network. 1292 */ 1293 if (have_ripv1_out || have_ripv1_in) { 1294 ifp->int_state |= IS_NEED_NET_SYN; 1295 rt = rtget(ifp->int_std_addr, ifp->int_std_mask); 1296 if (rt != 0 1297 && 0 == (rt->rt_state & RS_NO_NET_SYN) 1298 && (!(rt->rt_state & RS_NET_SYN) 1299 || rt->rt_metric > ifp->int_metric)) { 1300 rtdelete(rt); 1301 rt = 0; 1302 } 1303 if (rt == 0) { 1304 new.rts_ifp = ifp; 1305 new.rts_gate = ifp->int_addr; 1306 new.rts_router = ifp->int_addr; 1307 new.rts_metric = ifp->int_metric; 1308 rtadd(ifp->int_std_addr, ifp->int_std_mask, 1309 RS_NET_SYN, &new); 1310 } 1311 1312 } else { 1313 ifp->int_state &= ~IS_NEED_NET_SYN; 1314 1315 rt = rtget(ifp->int_std_addr, 1316 ifp->int_std_mask); 1317 if (rt != 0 1318 && (rt->rt_state & RS_NET_SYN) 1319 && rt->rt_ifp == ifp) 1320 rtbad_sub(rt); 1321 } 1322 } 1323 1324 1325 /* Add route for interface if not currently installed. 1326 * Create route to other end if a point-to-point link, 1327 * otherwise a route to this (sub)network. 1328 */ 1329 int /* 0=bad interface */ 1330 addrouteforif(struct interface *ifp) 1331 { 1332 struct rt_entry *rt; 1333 static struct rt_spare new; 1334 naddr dst; 1335 1336 1337 /* skip sick interfaces 1338 */ 1339 if (ifp->int_state & IS_BROKE) 1340 return 0; 1341 1342 /* If the interface on a subnet, then install a RIPv1 route to 1343 * the network as well (unless it is sick). 1344 */ 1345 if (ifp->int_state & IS_SUBNET) 1346 check_net_syn(ifp); 1347 1348 dst = (0 != (ifp->int_if_flags & (IFF_POINTOPOINT | IFF_LOOPBACK)) 1349 ? ifp->int_dstaddr 1350 : htonl(ifp->int_net)); 1351 1352 new.rts_ifp = ifp; 1353 new.rts_router = ifp->int_addr; 1354 new.rts_gate = ifp->int_addr; 1355 new.rts_metric = ifp->int_metric; 1356 new.rts_time = now.tv_sec; 1357 1358 /* If we are going to send packets to the gateway, 1359 * it must be reachable using our physical interfaces 1360 */ 1361 if ((ifp->int_state & IS_REMOTE) 1362 && !(ifp->int_state & IS_EXTERNAL) 1363 && !check_remote(ifp)) 1364 return 0; 1365 1366 /* We are finished if the correct main interface route exists. 1367 * The right route must be for the right interface, not synthesized 1368 * from a subnet, be a "gateway" or not as appropriate, and so forth. 1369 */ 1370 del_static(dst, ifp->int_mask, 0, 0); 1371 rt = rtget(dst, ifp->int_mask); 1372 if (rt != 0) { 1373 if ((rt->rt_ifp != ifp 1374 || rt->rt_router != ifp->int_addr) 1375 && (!(ifp->int_state & IS_DUP) 1376 || rt->rt_ifp == 0 1377 || (rt->rt_ifp->int_state & IS_BROKE))) { 1378 rtdelete(rt); 1379 rt = 0; 1380 } else { 1381 rtchange(rt, ((rt->rt_state | RS_IF) 1382 & ~(RS_NET_SYN | RS_LOCAL)), 1383 &new, 0); 1384 } 1385 } 1386 if (rt == 0) { 1387 if (ifp->int_transitions++ > 0) 1388 trace_act("re-install interface %s", 1389 ifp->int_name); 1390 1391 rtadd(dst, ifp->int_mask, RS_IF, &new); 1392 } 1393 1394 return 1; 1395 } 1396