1 /* $NetBSD: if.c,v 1.19 2000/03/02 20:57:42 christos Exp $ */ 2 3 /* 4 * Copyright (c) 1983, 1993 5 * The Regents of the University of California. 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. All advertising materials mentioning features or use of this software 16 * must display the following acknowledgment: 17 * This product includes software developed by the University of 18 * California, Berkeley and its contributors. 19 * 4. Neither the name of the University nor the names of its contributors 20 * may be used to endorse or promote products derived from this software 21 * without specific prior written permission. 22 * 23 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND 24 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 25 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 26 * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE 27 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 28 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 29 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 30 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 31 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 32 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 33 * SUCH DAMAGE. 34 */ 35 36 #if !defined(lint) && !defined(sgi) && !defined(__NetBSD__) 37 static char sccsid[] __attribute__((unused)) = "@(#)if.c 8.1 (Berkeley) 6/5/93"; 38 #elif defined(__NetBSD__) 39 #include <sys/cdefs.h> 40 __RCSID("$NetBSD: if.c,v 1.19 2000/03/02 20:57:42 christos Exp $"); 41 #endif 42 43 #include "defs.h" 44 #include "pathnames.h" 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 != 0) 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) != 0) 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) != 0) 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 != 0) 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 != 0) 138 hifp = &(*hifp)->int_nhash; 139 } 140 ifp->int_nhash_prev = hifp; 141 if ((ifp->int_nhash = *hifp) != 0) 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 = 0; 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 != 0; 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 index, 217 int rescan_ok) 218 { 219 struct interface *ifp; 220 221 for (;;) { 222 for (ifp = ifnet; 0 != ifp; ifp = ifp->int_next) { 223 if (ifp->int_index == index) 224 return ifp; 225 } 226 227 /* If there is no known interface, maybe there is a 228 * new interface. So just once look for new interfaces. 229 */ 230 if (!rescan_ok 231 || IF_RESCAN_DELAY()) 232 return 0; 233 ifinit(); 234 } 235 } 236 237 238 /* Find an interface from which the specified address 239 * should have come from. Used for figuring out which 240 * interface a packet came in on. 241 */ 242 struct interface * 243 iflookup(naddr addr) 244 { 245 struct interface *ifp, *maybe; 246 247 maybe = 0; 248 for (;;) { 249 for (ifp = ifnet; ifp; ifp = ifp->int_next) { 250 if (ifp->int_if_flags & IFF_POINTOPOINT) { 251 /* finished with a match */ 252 if (ifp->int_dstaddr == addr) 253 return ifp; 254 255 } else { 256 /* finished with an exact match */ 257 if (ifp->int_addr == addr) 258 return ifp; 259 260 /* Look for the longest approximate match. 261 */ 262 if (on_net(addr, ifp->int_net, ifp->int_mask) 263 && (maybe == 0 264 || ifp->int_mask > maybe->int_mask)) 265 maybe = ifp; 266 } 267 } 268 269 if (maybe != 0) 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 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 a IP address looks reasonable as a destination 369 */ 370 int /* 0=bad */ 371 check_dst(naddr addr) 372 { 373 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_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 != 0 432 && 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; 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) 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 (void)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 (void)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; 0 != ifp1; ifp1 = ifp1->int_next) { 572 if (ifp1 != ifp 573 && !strcmp(ifp->int_name, ifp1->int_name)) 574 if_bad(ifp1); 575 } 576 (void)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; 0 != 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; 0 != 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 #ifdef RTM_OIFINFO 739 if (ifam->ifam_type == RTM_OIFINFO) { 740 continue; /* just ignore compat message */ 741 } 742 #endif 743 if (ifam->ifam_type == RTM_IFINFO) { 744 struct sockaddr_dl *sdl; 745 746 ifm = (struct if_msghdr *)ifam; 747 /* make prototype structure for the IP aliases 748 */ 749 memset(&ifs0, 0, sizeof(ifs0)); 750 ifs0.int_rip_sock = -1; 751 ifs0.int_index = ifm->ifm_index; 752 ifs0.int_if_flags = ifm->ifm_flags; 753 ifs0.int_state = IS_CHECKED; 754 ifs0.int_query_time = NEVER; 755 ifs0.int_act_time = now.tv_sec; 756 ifs0.int_data.ts = now.tv_sec; 757 ifs0.int_data.ipackets = ifm->ifm_data.ifi_ipackets; 758 ifs0.int_data.ierrors = ifm->ifm_data.ifi_ierrors; 759 ifs0.int_data.opackets = ifm->ifm_data.ifi_opackets; 760 ifs0.int_data.oerrors = ifm->ifm_data.ifi_oerrors; 761 #ifdef sgi 762 ifs0.int_data.odrops = ifm->ifm_data.ifi_odrops; 763 #endif 764 sdl = (struct sockaddr_dl *)(ifm + 1); 765 sdl->sdl_data[sdl->sdl_nlen] = 0; 766 strncpy(ifs0.int_name, sdl->sdl_data, 767 MIN(sizeof(ifs0.int_name), sdl->sdl_nlen)); 768 continue; 769 } 770 if (ifam->ifam_type != RTM_NEWADDR) { 771 logbad(1,"ifinit: out of sync"); 772 continue; 773 } 774 rt_xaddrs(&info, (struct sockaddr *)(ifam+1), 775 (struct sockaddr *)ifam2, 776 ifam->ifam_addrs); 777 778 /* Prepare for the next address of this interface, which 779 * will be an alias. 780 * Do not output RIP or Router-Discovery packets via aliases. 781 */ 782 memcpy(&ifs, &ifs0, sizeof(ifs)); 783 ifs0.int_state |= (IS_ALIAS | IS_NO_RIP_OUT | IS_NO_RDISC); 784 785 if (INFO_IFA(&info) == 0) { 786 if (iff_up(ifs.int_if_flags)) { 787 if (!(prev_complaints & COMP_NOADDR)) 788 msglog("%s has no address", 789 ifs.int_name); 790 complaints |= COMP_NOADDR; 791 } 792 continue; 793 } 794 if (INFO_IFA(&info)->sa_family != AF_INET) { 795 if (iff_up(ifs.int_if_flags)) { 796 if (!(prev_complaints & COMP_NOT_INET)) 797 trace_act("%s: not AF_INET", 798 ifs.int_name); 799 complaints |= COMP_NOT_INET; 800 } 801 continue; 802 } 803 804 ifs.int_addr = S_ADDR(INFO_IFA(&info)); 805 806 if (ntohl(ifs.int_addr)>>24 == 0 807 || ntohl(ifs.int_addr)>>24 == 0xff) { 808 if (iff_up(ifs.int_if_flags)) { 809 if (!(prev_complaints & COMP_BADADDR)) 810 msglog("%s has a bad address", 811 ifs.int_name); 812 complaints |= COMP_BADADDR; 813 } 814 continue; 815 } 816 817 if (ifs.int_if_flags & IFF_LOOPBACK) { 818 ifs.int_state |= IS_PASSIVE | IS_NO_RIP | IS_NO_RDISC; 819 ifs.int_dstaddr = ifs.int_addr; 820 ifs.int_mask = HOST_MASK; 821 ifs.int_ripv1_mask = HOST_MASK; 822 ifs.int_std_mask = std_mask(ifs.int_dstaddr); 823 ifs.int_net = ntohl(ifs.int_dstaddr); 824 if (!foundloopback) { 825 foundloopback = 1; 826 loopaddr = ifs.int_addr; 827 loop_rts.rts_gate = loopaddr; 828 loop_rts.rts_router = loopaddr; 829 } 830 831 } else if (ifs.int_if_flags & IFF_POINTOPOINT) { 832 if (INFO_BRD(&info) == 0 833 || INFO_BRD(&info)->sa_family != AF_INET) { 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_dstaddr = S_ADDR(INFO_BRD(&info)); 844 if (ntohl(ifs.int_dstaddr)>>24 == 0 845 || ntohl(ifs.int_dstaddr)>>24 == 0xff) { 846 if (iff_up(ifs.int_if_flags)) { 847 if (!(prev_complaints & COMP_NODST)) 848 msglog("%s has a bad" 849 " destination address", 850 ifs.int_name); 851 complaints |= COMP_NODST; 852 } 853 continue; 854 } 855 ifs.int_mask = HOST_MASK; 856 ifs.int_ripv1_mask = ntohl(S_ADDR(INFO_MASK(&info))); 857 ifs.int_std_mask = std_mask(ifs.int_dstaddr); 858 ifs.int_net = ntohl(ifs.int_dstaddr); 859 860 } else { 861 if (INFO_MASK(&info) == 0) { 862 if (iff_up(ifs.int_if_flags)) { 863 if (!(prev_complaints & COMP_NOMASK)) 864 msglog("%s has no netmask", 865 ifs.int_name); 866 complaints |= COMP_NOMASK; 867 } 868 continue; 869 } 870 ifs.int_dstaddr = ifs.int_addr; 871 ifs.int_mask = ntohl(S_ADDR(INFO_MASK(&info))); 872 ifs.int_ripv1_mask = ifs.int_mask; 873 ifs.int_std_mask = std_mask(ifs.int_addr); 874 ifs.int_net = ntohl(ifs.int_addr) & ifs.int_mask; 875 if (ifs.int_mask != ifs.int_std_mask) 876 ifs.int_state |= IS_SUBNET; 877 878 if (ifs.int_if_flags & IFF_BROADCAST) { 879 if (INFO_BRD(&info) == 0) { 880 if (iff_up(ifs.int_if_flags)) { 881 if (!(prev_complaints 882 & COMP_NOBADR)) 883 msglog("%s has" 884 "no broadcast address", 885 ifs.int_name); 886 complaints |= COMP_NOBADR; 887 } 888 continue; 889 } 890 ifs.int_brdaddr = S_ADDR(INFO_BRD(&info)); 891 } 892 } 893 ifs.int_std_net = ifs.int_net & ifs.int_std_mask; 894 ifs.int_std_addr = htonl(ifs.int_std_net); 895 896 /* Use a minimum metric of one. Treat the interface metric 897 * (default 0) as an increment to the hop count of one. 898 * 899 * The metric obtained from the routing socket dump of 900 * interface addresses is wrong. It is not set by the 901 * SIOCSIFMETRIC ioctl. 902 */ 903 #ifdef SIOCGIFMETRIC 904 strncpy(ifr.ifr_name, ifs.int_name, sizeof(ifr.ifr_name)); 905 if (ioctl(rt_sock, SIOCGIFMETRIC, &ifr) < 0) { 906 DBGERR(1, "ioctl(SIOCGIFMETRIC)"); 907 ifs.int_metric = 0; 908 } else { 909 ifs.int_metric = ifr.ifr_metric; 910 } 911 #else 912 ifs.int_metric = ifam->ifam_metric; 913 #endif 914 if (ifs.int_metric > HOPCNT_INFINITY) { 915 ifs.int_metric = 0; 916 if (!(prev_complaints & COMP_BAD_METRIC) 917 && iff_up(ifs.int_if_flags)) { 918 complaints |= COMP_BAD_METRIC; 919 msglog("%s has a metric of %d", 920 ifs.int_name, ifs.int_metric); 921 } 922 } 923 924 /* See if this is a familiar interface. 925 * If so, stop worrying about it if it is the same. 926 * Start it over if it now is to somewhere else, as happens 927 * frequently with PPP and SLIP. 928 */ 929 ifp = ifwithname(ifs.int_name, ((ifs.int_state & IS_ALIAS) 930 ? ifs.int_addr 931 : 0)); 932 if (ifp != 0) { 933 ifp->int_state |= IS_CHECKED; 934 935 if (0 != ((ifp->int_if_flags ^ ifs.int_if_flags) 936 & (IFF_BROADCAST 937 | IFF_LOOPBACK 938 | IFF_POINTOPOINT 939 | IFF_MULTICAST)) 940 || 0 != ((ifp->int_state ^ ifs.int_state) 941 & IS_ALIAS) 942 || ifp->int_addr != ifs.int_addr 943 || ifp->int_brdaddr != ifs.int_brdaddr 944 || ifp->int_dstaddr != ifs.int_dstaddr 945 || ifp->int_mask != ifs.int_mask 946 || ifp->int_metric != ifs.int_metric) { 947 /* Forget old information about 948 * a changed interface. 949 */ 950 trace_act("interface %s has changed", 951 ifp->int_name); 952 ifdel(ifp); 953 ifp = 0; 954 } 955 } 956 957 if (ifp != 0) { 958 /* The primary representative of an alias worries 959 * about how things are working. 960 */ 961 if (ifp->int_state & IS_ALIAS) 962 continue; 963 964 /* note interfaces that have been turned off 965 */ 966 if (!iff_up(ifs.int_if_flags)) { 967 if (iff_up(ifp->int_if_flags)) { 968 msglog("interface %s to %s turned off", 969 ifp->int_name, 970 naddr_ntoa(ifp->int_dstaddr)); 971 if_bad(ifp); 972 ifp->int_if_flags &= ~IFF_UP; 973 } else if (now.tv_sec>(ifp->int_data.ts 974 + CHECK_BAD_INTERVAL)) { 975 trace_act("interface %s has been off" 976 " %ld seconds; forget it", 977 ifp->int_name, 978 now.tv_sec-ifp->int_data.ts); 979 ifdel(ifp); 980 } 981 continue; 982 } 983 /* or that were off and are now ok */ 984 if (!iff_up(ifp->int_if_flags)) { 985 ifp->int_if_flags |= IFF_UP; 986 (void)if_ok(ifp, ""); 987 } 988 989 /* If it has been long enough, 990 * see if the interface is broken. 991 */ 992 if (now.tv_sec < ifp->int_data.ts+CHECK_BAD_INTERVAL) 993 continue; 994 995 in = ifs.int_data.ipackets - ifp->int_data.ipackets; 996 ierr = ifs.int_data.ierrors - ifp->int_data.ierrors; 997 out = ifs.int_data.opackets - ifp->int_data.opackets; 998 oerr = ifs.int_data.oerrors - ifp->int_data.oerrors; 999 #ifdef sgi 1000 /* Through at least IRIX 6.2, PPP and SLIP 1001 * count packets dropped by the filters. 1002 * But FDDI rings stuck non-operational count 1003 * dropped packets as they wait for improvement. 1004 */ 1005 if (!(ifp->int_if_flags & IFF_POINTOPOINT)) 1006 oerr += (ifs.int_data.odrops 1007 - ifp->int_data.odrops); 1008 #endif 1009 /* If the interface just awoke, restart the counters. 1010 */ 1011 if (ifp->int_data.ts == 0) { 1012 ifp->int_data = ifs.int_data; 1013 continue; 1014 } 1015 ifp->int_data = ifs.int_data; 1016 1017 /* Withhold judgment when the short error 1018 * counters wrap or the interface is reset. 1019 */ 1020 if (ierr < 0 || in < 0 || oerr < 0 || out < 0) { 1021 LIM_SEC(ifinit_timer, 1022 now.tv_sec+CHECK_BAD_INTERVAL); 1023 continue; 1024 } 1025 1026 /* Withhold judgement when there is no traffic 1027 */ 1028 if (in == 0 && out == 0 && ierr == 0 && oerr == 0) 1029 continue; 1030 1031 /* It is bad if input or output is not working. 1032 * Require presistent problems before marking it dead. 1033 */ 1034 if ((in <= ierr && ierr > 0) 1035 || (out <= oerr && oerr > 0)) { 1036 if (!(ifp->int_state & IS_SICK)) { 1037 trace_act("interface %s to %s" 1038 " sick: in=%d ierr=%d" 1039 " out=%d oerr=%d", 1040 ifp->int_name, 1041 naddr_ntoa(ifp->int_dstaddr), 1042 in, ierr, out, oerr); 1043 if_sick(ifp); 1044 continue; 1045 } 1046 if (!(ifp->int_state & IS_BROKE)) { 1047 msglog("interface %s to %s broken:" 1048 " in=%d ierr=%d out=%d oerr=%d", 1049 ifp->int_name, 1050 naddr_ntoa(ifp->int_dstaddr), 1051 in, ierr, out, oerr); 1052 if_bad(ifp); 1053 } 1054 continue; 1055 } 1056 1057 /* otherwise, it is active and healthy 1058 */ 1059 ifp->int_act_time = now.tv_sec; 1060 (void)if_ok(ifp, ""); 1061 continue; 1062 } 1063 1064 /* This is a new interface. 1065 * If it is dead, forget it. 1066 */ 1067 if (!iff_up(ifs.int_if_flags)) 1068 continue; 1069 1070 /* If it duplicates an existing interface, 1071 * complain about it, mark the other one 1072 * duplicated, and forget this one. 1073 */ 1074 ifp = check_dup(ifs.int_addr,ifs.int_dstaddr,ifs.int_mask, 1075 ifs.int_if_flags); 1076 if (ifp != 0) { 1077 /* Ignore duplicates of itself, caused by having 1078 * IP aliases on the same network. 1079 */ 1080 if (!strcmp(ifp->int_name, ifs.int_name)) 1081 continue; 1082 1083 if (!(prev_complaints & COMP_DUP)) { 1084 complaints |= COMP_DUP; 1085 msglog("%s (%s%s%s) is duplicated by" 1086 " %s (%s%s%s)", 1087 ifs.int_name, 1088 addrname(ifs.int_addr,ifs.int_mask,1), 1089 ((ifs.int_if_flags & IFF_POINTOPOINT) 1090 ? "-->" : ""), 1091 ((ifs.int_if_flags & IFF_POINTOPOINT) 1092 ? naddr_ntoa(ifs.int_dstaddr) : ""), 1093 ifp->int_name, 1094 addrname(ifp->int_addr,ifp->int_mask,1), 1095 ((ifp->int_if_flags & IFF_POINTOPOINT) 1096 ? "-->" : ""), 1097 ((ifp->int_if_flags & IFF_POINTOPOINT) 1098 ? naddr_ntoa(ifp->int_dstaddr) : "")); 1099 } 1100 ifp->int_state |= IS_DUP; 1101 continue; 1102 } 1103 1104 if (0 == (ifs.int_if_flags & (IFF_POINTOPOINT | IFF_BROADCAST)) 1105 && !(ifs.int_state & IS_PASSIVE)) { 1106 trace_act("%s is neither broadcast, point-to-point," 1107 " nor loopback", 1108 ifs.int_name); 1109 if (!(ifs.int_state & IFF_MULTICAST)) 1110 ifs.int_state |= IS_NO_RDISC; 1111 } 1112 1113 1114 /* It is new and ok. Add it to the list of interfaces 1115 */ 1116 ifp = (struct interface *)rtmalloc(sizeof(*ifp), "ifinit ifp"); 1117 memcpy(ifp, &ifs, sizeof(*ifp)); 1118 get_parms(ifp); 1119 if_link(ifp); 1120 trace_if("Add", ifp); 1121 1122 /* Notice likely bad netmask. 1123 */ 1124 if (!(prev_complaints & COMP_NETMASK) 1125 && !(ifp->int_if_flags & IFF_POINTOPOINT) 1126 && ifp->int_addr != RIP_DEFAULT) { 1127 for (ifp1 = ifnet; 0 != ifp1; ifp1 = ifp1->int_next) { 1128 if (ifp1->int_mask == ifp->int_mask) 1129 continue; 1130 if (ifp1->int_if_flags & IFF_POINTOPOINT) 1131 continue; 1132 if (ifp1->int_dstaddr == RIP_DEFAULT) 1133 continue; 1134 if (on_net(ifp->int_dstaddr, 1135 ifp1->int_net, ifp1->int_mask) 1136 || on_net(ifp1->int_dstaddr, 1137 ifp->int_net, ifp->int_mask)) { 1138 msglog("possible netmask problem" 1139 " between %s:%s and %s:%s", 1140 ifp->int_name, 1141 addrname(htonl(ifp->int_net), 1142 ifp->int_mask, 1), 1143 ifp1->int_name, 1144 addrname(htonl(ifp1->int_net), 1145 ifp1->int_mask, 1)); 1146 complaints |= COMP_NETMASK; 1147 } 1148 } 1149 } 1150 1151 if (!(ifp->int_state & IS_ALIAS)) { 1152 /* Count the # of directly connected networks. 1153 */ 1154 if (!(ifp->int_if_flags & IFF_LOOPBACK)) 1155 tot_interfaces++; 1156 if (!IS_RIP_OFF(ifp->int_state)) 1157 rip_interfaces++; 1158 1159 /* turn on router discovery and RIP If needed */ 1160 if_ok_rdisc(ifp); 1161 rip_on(ifp); 1162 } 1163 } 1164 1165 /* If we are multi-homed and have at least two interfaces 1166 * listening to RIP, then output by default. 1167 */ 1168 if (!supplier_set && rip_interfaces > 1) 1169 set_supplier(); 1170 1171 /* If we are multi-homed, optionally advertise a route to 1172 * our main address. 1173 */ 1174 if (advertise_mhome 1175 || (tot_interfaces > 1 1176 && mhome 1177 && (ifp = ifwithaddr(myaddr, 0, 0)) != 0 1178 && foundloopback)) { 1179 advertise_mhome = 1; 1180 rt = rtget(myaddr, HOST_MASK); 1181 if (rt != 0) { 1182 if (rt->rt_ifp != ifp 1183 || rt->rt_router != loopaddr) { 1184 rtdelete(rt); 1185 rt = 0; 1186 } else { 1187 loop_rts.rts_ifp = ifp; 1188 loop_rts.rts_metric = 0; 1189 loop_rts.rts_time = rt->rt_time; 1190 rtchange(rt, rt->rt_state | RS_MHOME, 1191 &loop_rts, 0); 1192 } 1193 } 1194 if (rt == 0) { 1195 loop_rts.rts_ifp = ifp; 1196 loop_rts.rts_metric = 0; 1197 rtadd(myaddr, HOST_MASK, RS_MHOME, &loop_rts); 1198 } 1199 } 1200 1201 for (ifp = ifnet; ifp != 0; ifp = ifp1) { 1202 ifp1 = ifp->int_next; /* because we may delete it */ 1203 1204 /* Forget any interfaces that have disappeared. 1205 */ 1206 if (!(ifp->int_state & (IS_CHECKED | IS_REMOTE))) { 1207 trace_act("interface %s has disappeared", 1208 ifp->int_name); 1209 ifdel(ifp); 1210 continue; 1211 } 1212 1213 if ((ifp->int_state & IS_BROKE) 1214 && !(ifp->int_state & IS_PASSIVE)) 1215 LIM_SEC(ifinit_timer, now.tv_sec+CHECK_BAD_INTERVAL); 1216 1217 /* If we ever have a RIPv1 interface, assume we always will. 1218 * It might come back if it ever goes away. 1219 */ 1220 if (!(ifp->int_state & IS_NO_RIPV1_OUT) && supplier) 1221 have_ripv1_out = 1; 1222 if (!(ifp->int_state & IS_NO_RIPV1_IN)) 1223 have_ripv1_in = 1; 1224 } 1225 1226 for (ifp = ifnet; ifp != 0; ifp = ifp->int_next) { 1227 /* Ensure there is always a network route for interfaces, 1228 * after any dead interfaces have been deleted, which 1229 * might affect routes for point-to-point links. 1230 */ 1231 if (!addrouteforif(ifp)) 1232 continue; 1233 1234 /* Add routes to the local end of point-to-point interfaces 1235 * using loopback. 1236 */ 1237 if ((ifp->int_if_flags & IFF_POINTOPOINT) 1238 && !(ifp->int_state & IS_REMOTE) 1239 && foundloopback) { 1240 /* Delete any routes to the network address through 1241 * foreign routers. Remove even static routes. 1242 */ 1243 del_static(ifp->int_addr, HOST_MASK, 0, 0); 1244 rt = rtget(ifp->int_addr, HOST_MASK); 1245 if (rt != 0 && rt->rt_router != loopaddr) { 1246 rtdelete(rt); 1247 rt = 0; 1248 } 1249 if (rt != 0) { 1250 if (!(rt->rt_state & RS_LOCAL) 1251 || rt->rt_metric > ifp->int_metric) { 1252 ifp1 = ifp; 1253 } else { 1254 ifp1 = rt->rt_ifp; 1255 } 1256 loop_rts.rts_ifp = ifp1; 1257 loop_rts.rts_metric = 0; 1258 loop_rts.rts_time = rt->rt_time; 1259 rtchange(rt, ((rt->rt_state & ~RS_NET_SYN) 1260 | (RS_IF|RS_LOCAL)), 1261 &loop_rts, 0); 1262 } else { 1263 loop_rts.rts_ifp = ifp; 1264 loop_rts.rts_metric = 0; 1265 rtadd(ifp->int_addr, HOST_MASK, 1266 (RS_IF | RS_LOCAL), &loop_rts); 1267 } 1268 } 1269 } 1270 1271 /* add the authority routes */ 1272 for (intnetp = intnets; intnetp!=0; intnetp = intnetp->intnet_next) { 1273 rt = rtget(intnetp->intnet_addr, intnetp->intnet_mask); 1274 if (rt != 0 1275 && !(rt->rt_state & RS_NO_NET_SYN) 1276 && !(rt->rt_state & RS_NET_INT)) { 1277 rtdelete(rt); 1278 rt = 0; 1279 } 1280 if (rt == 0) { 1281 loop_rts.rts_ifp = 0; 1282 loop_rts.rts_metric = intnetp->intnet_metric-1; 1283 rtadd(intnetp->intnet_addr, intnetp->intnet_mask, 1284 RS_NET_SYN | RS_NET_INT, &loop_rts); 1285 } 1286 } 1287 1288 prev_complaints = complaints; 1289 } 1290 1291 1292 static void 1293 check_net_syn(struct interface *ifp) 1294 { 1295 struct rt_entry *rt; 1296 static struct rt_spare new; 1297 1298 1299 /* Turn on the need to automatically synthesize a network route 1300 * for this interface only if we are running RIPv1 on some other 1301 * interface that is on a different class-A,B,or C network. 1302 */ 1303 if (have_ripv1_out || have_ripv1_in) { 1304 ifp->int_state |= IS_NEED_NET_SYN; 1305 rt = rtget(ifp->int_std_addr, ifp->int_std_mask); 1306 if (rt != 0 1307 && 0 == (rt->rt_state & RS_NO_NET_SYN) 1308 && (!(rt->rt_state & RS_NET_SYN) 1309 || rt->rt_metric > ifp->int_metric)) { 1310 rtdelete(rt); 1311 rt = 0; 1312 } 1313 if (rt == 0) { 1314 new.rts_ifp = ifp; 1315 new.rts_gate = ifp->int_addr; 1316 new.rts_router = ifp->int_addr; 1317 new.rts_metric = ifp->int_metric; 1318 rtadd(ifp->int_std_addr, ifp->int_std_mask, 1319 RS_NET_SYN, &new); 1320 } 1321 1322 } else { 1323 ifp->int_state &= ~IS_NEED_NET_SYN; 1324 1325 rt = rtget(ifp->int_std_addr, 1326 ifp->int_std_mask); 1327 if (rt != 0 1328 && (rt->rt_state & RS_NET_SYN) 1329 && rt->rt_ifp == ifp) 1330 rtbad_sub(rt); 1331 } 1332 } 1333 1334 1335 /* Add route for interface if not currently installed. 1336 * Create route to other end if a point-to-point link, 1337 * otherwise a route to this (sub)network. 1338 */ 1339 int /* 0=bad interface */ 1340 addrouteforif(struct interface *ifp) 1341 { 1342 struct rt_entry *rt; 1343 static struct rt_spare new; 1344 naddr dst; 1345 1346 1347 /* skip sick interfaces 1348 */ 1349 if (ifp->int_state & IS_BROKE) 1350 return 0; 1351 1352 /* If the interface on a subnet, then install a RIPv1 route to 1353 * the network as well (unless it is sick). 1354 */ 1355 if (ifp->int_state & IS_SUBNET) 1356 check_net_syn(ifp); 1357 1358 dst = (0 != (ifp->int_if_flags & (IFF_POINTOPOINT | IFF_LOOPBACK)) 1359 ? ifp->int_dstaddr 1360 : htonl(ifp->int_net)); 1361 1362 new.rts_ifp = ifp; 1363 new.rts_router = ifp->int_addr; 1364 new.rts_gate = ifp->int_addr; 1365 new.rts_metric = ifp->int_metric; 1366 new.rts_time = now.tv_sec; 1367 1368 /* If we are going to send packets to the gateway, 1369 * it must be reachable using our physical interfaces 1370 */ 1371 if ((ifp->int_state & IS_REMOTE) 1372 && !(ifp->int_state & IS_EXTERNAL) 1373 && !check_remote(ifp)) 1374 return 0; 1375 1376 /* We are finished if the correct main interface route exists. 1377 * The right route must be for the right interface, not synthesized 1378 * from a subnet, be a "gateway" or not as appropriate, and so forth. 1379 */ 1380 del_static(dst, ifp->int_mask, 0, 0); 1381 rt = rtget(dst, ifp->int_mask); 1382 if (rt != 0) { 1383 if ((rt->rt_ifp != ifp 1384 || rt->rt_router != ifp->int_addr) 1385 && (!(ifp->int_state & IS_DUP) 1386 || rt->rt_ifp == 0 1387 || (rt->rt_ifp->int_state & IS_BROKE))) { 1388 rtdelete(rt); 1389 rt = 0; 1390 } else { 1391 rtchange(rt, ((rt->rt_state | RS_IF) 1392 & ~(RS_NET_SYN | RS_LOCAL)), 1393 &new, 0); 1394 } 1395 } 1396 if (rt == 0) { 1397 if (ifp->int_transitions++ > 0) 1398 trace_act("re-install interface %s", 1399 ifp->int_name); 1400 1401 rtadd(dst, ifp->int_mask, RS_IF, &new); 1402 } 1403 1404 return 1; 1405 } 1406