1/*- 2 * SPDX-License-Identifier: BSD-3-Clause 3 * 4 * Copyright (c) 1983, 1988, 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. Neither the name of the University nor the names of its contributors 16 * may be used to endorse or promote products derived from this software 17 * without specific prior written permission. 18 * 19 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND 20 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 21 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 22 * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE 23 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 24 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 25 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 26 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 27 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 28 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 29 * SUCH DAMAGE. 30 * 31 * $FreeBSD$ 32 */ 33 34#include "defs.h" 35 36__RCSID("$FreeBSD$"); 37 38 39u_int update_seqno; 40 41 42/* walk the tree of routes with this for output 43 */ 44static struct { 45 struct sockaddr_in to; 46 naddr to_mask; 47 naddr to_net; 48 naddr to_std_mask; 49 naddr to_std_net; 50 struct interface *ifp; /* usually output interface */ 51 struct auth *a; 52 char metric; /* adjust metrics by interface */ 53 int npackets; 54 int gen_limit; 55 u_int state; 56#define WS_ST_FLASH 0x001 /* send only changed routes */ 57#define WS_ST_RIP2_ALL 0x002 /* send full featured RIPv2 */ 58#define WS_ST_AG 0x004 /* ok to aggregate subnets */ 59#define WS_ST_SUPER_AG 0x008 /* ok to aggregate networks */ 60#define WS_ST_QUERY 0x010 /* responding to a query */ 61#define WS_ST_TO_ON_NET 0x020 /* sending onto one of our nets */ 62#define WS_ST_DEFAULT 0x040 /* faking a default */ 63} ws; 64 65/* A buffer for what can be heard by both RIPv1 and RIPv2 listeners */ 66struct ws_buf v12buf; 67static union pkt_buf ripv12_buf; 68 69/* Another for only RIPv2 listeners */ 70static struct ws_buf v2buf; 71static union pkt_buf rip_v2_buf; 72 73 74 75void 76bufinit(void) 77{ 78 ripv12_buf.rip.rip_cmd = RIPCMD_RESPONSE; 79 v12buf.buf = &ripv12_buf.rip; 80 v12buf.base = &v12buf.buf->rip_nets[0]; 81 82 rip_v2_buf.rip.rip_cmd = RIPCMD_RESPONSE; 83 rip_v2_buf.rip.rip_vers = RIPv2; 84 v2buf.buf = &rip_v2_buf.rip; 85 v2buf.base = &v2buf.buf->rip_nets[0]; 86} 87 88 89/* Send the contents of the global buffer via the non-multicast socket 90 */ 91int /* <0 on failure */ 92output(enum output_type type, 93 struct sockaddr_in *dst, /* send to here */ 94 struct interface *ifp, 95 struct rip *buf, 96 int size) /* this many bytes */ 97{ 98 struct sockaddr_in osin; 99 int flags; 100 const char *msg; 101 int res; 102 int soc; 103 int serrno; 104 105 assert(ifp != NULL); 106 osin = *dst; 107 if (osin.sin_port == 0) 108 osin.sin_port = htons(RIP_PORT); 109#ifdef _HAVE_SIN_LEN 110 if (osin.sin_len == 0) 111 osin.sin_len = sizeof(osin); 112#endif 113 114 soc = rip_sock; 115 flags = 0; 116 117 switch (type) { 118 case OUT_QUERY: 119 msg = "Answer Query"; 120 if (soc < 0) 121 soc = ifp->int_rip_sock; 122 break; 123 case OUT_UNICAST: 124 msg = "Send"; 125 if (soc < 0) 126 soc = ifp->int_rip_sock; 127 flags = MSG_DONTROUTE; 128 break; 129 case OUT_BROADCAST: 130 if (ifp->int_if_flags & IFF_POINTOPOINT) { 131 msg = "Send"; 132 } else { 133 msg = "Send bcast"; 134 } 135 flags = MSG_DONTROUTE; 136 break; 137 case OUT_MULTICAST: 138 if ((ifp->int_if_flags & (IFF_POINTOPOINT|IFF_MULTICAST)) == 139 IFF_POINTOPOINT) { 140 msg = "Send pt-to-pt"; 141 } else if (ifp->int_state & IS_DUP) { 142 trace_act("abort multicast output via %s" 143 " with duplicate address", 144 ifp->int_name); 145 return 0; 146 } else { 147 msg = "Send mcast"; 148 if (rip_sock_mcast != ifp) { 149 struct ip_mreqn mreqn; 150 151 memset(&mreqn, 0, sizeof(struct ip_mreqn)); 152 mreqn.imr_ifindex = ifp->int_index; 153 if (0 > setsockopt(rip_sock, 154 IPPROTO_IP, 155 IP_MULTICAST_IF, 156 &mreqn, 157 sizeof(mreqn))) { 158 serrno = errno; 159 LOGERR("setsockopt(rip_sock, " 160 "IP_MULTICAST_IF)"); 161 errno = serrno; 162 ifp = NULL; 163 return -1; 164 } 165 rip_sock_mcast = ifp; 166 } 167 osin.sin_addr.s_addr = htonl(INADDR_RIP_GROUP); 168 } 169 break; 170 171 case NO_OUT_MULTICAST: 172 case NO_OUT_RIPV2: 173 default: 174#ifdef DEBUG 175 abort(); 176#endif 177 return -1; 178 } 179 180 trace_rip(msg, "to", &osin, ifp, buf, size); 181 182 res = sendto(soc, buf, size, flags, 183 (struct sockaddr *)&osin, sizeof(osin)); 184 if (res < 0 185 && (ifp == NULL || !(ifp->int_state & IS_BROKE))) { 186 serrno = errno; 187 msglog("%s sendto(%s%s%s.%d): %s", msg, 188 ifp != NULL ? ifp->int_name : "", 189 ifp != NULL ? ", " : "", 190 inet_ntoa(osin.sin_addr), 191 ntohs(osin.sin_port), 192 strerror(errno)); 193 errno = serrno; 194 } 195 196 return res; 197} 198 199 200/* Find the first key for a packet to send. 201 * Try for a key that is eligible and has not expired, but settle for 202 * the last key if they have all expired. 203 * If no key is ready yet, give up. 204 */ 205struct auth * 206find_auth(struct interface *ifp) 207{ 208 struct auth *ap, *res; 209 int i; 210 211 212 if (ifp == NULL) 213 return 0; 214 215 res = NULL; 216 ap = ifp->int_auth; 217 for (i = 0; i < MAX_AUTH_KEYS; i++, ap++) { 218 /* stop looking after the last key */ 219 if (ap->type == RIP_AUTH_NONE) 220 break; 221 222 /* ignore keys that are not ready yet */ 223 if ((u_long)ap->start > (u_long)clk.tv_sec) 224 continue; 225 226 if ((u_long)ap->end < (u_long)clk.tv_sec) { 227 /* note best expired password as a fall-back */ 228 if (res == NULL || (u_long)ap->end > (u_long)res->end) 229 res = ap; 230 continue; 231 } 232 233 /* note key with the best future */ 234 if (res == NULL || (u_long)res->end < (u_long)ap->end) 235 res = ap; 236 } 237 return res; 238} 239 240 241void 242clr_ws_buf(struct ws_buf *wb, 243 struct auth *ap) 244{ 245 struct netauth *na; 246 247 wb->lim = wb->base + NETS_LEN; 248 wb->n = wb->base; 249 memset(wb->n, 0, NETS_LEN*sizeof(*wb->n)); 250 251 /* (start to) install authentication if appropriate 252 */ 253 if (ap == NULL) 254 return; 255 256 na = (struct netauth*)wb->n; 257 if (ap->type == RIP_AUTH_PW) { 258 na->a_family = RIP_AF_AUTH; 259 na->a_type = RIP_AUTH_PW; 260 memcpy(na->au.au_pw, ap->key, sizeof(na->au.au_pw)); 261 wb->n++; 262 263 } else if (ap->type == RIP_AUTH_MD5) { 264 na->a_family = RIP_AF_AUTH; 265 na->a_type = RIP_AUTH_MD5; 266 na->au.a_md5.md5_keyid = ap->keyid; 267 na->au.a_md5.md5_auth_len = RIP_AUTH_MD5_KEY_LEN; 268 na->au.a_md5.md5_seqno = htonl(clk.tv_sec); 269 wb->n++; 270 wb->lim--; /* make room for trailer */ 271 } 272} 273 274 275void 276end_md5_auth(struct ws_buf *wb, 277 struct auth *ap) 278{ 279 struct netauth *na, *na2; 280 MD5_CTX md5_ctx; 281 int len; 282 283 284 na = (struct netauth*)wb->base; 285 na2 = (struct netauth*)wb->n; 286 len = (char *)na2-(char *)wb->buf; 287 na2->a_family = RIP_AF_AUTH; 288 na2->a_type = htons(1); 289 na->au.a_md5.md5_pkt_len = htons(len); 290 MD5Init(&md5_ctx); 291 MD5Update(&md5_ctx, (u_char *)wb->buf, len + RIP_AUTH_MD5_HASH_XTRA); 292 MD5Update(&md5_ctx, ap->key, RIP_AUTH_MD5_KEY_LEN); 293 MD5Final(na2->au.au_pw, &md5_ctx); 294 wb->n++; 295} 296 297 298/* Send the buffer 299 */ 300static void 301supply_write(struct ws_buf *wb) 302{ 303 /* Output multicast only if legal. 304 * If we would multicast and it would be illegal, then discard the 305 * packet. 306 */ 307 switch (wb->type) { 308 case NO_OUT_MULTICAST: 309 trace_pkt("skip multicast to %s because impossible", 310 naddr_ntoa(ws.to.sin_addr.s_addr)); 311 break; 312 case NO_OUT_RIPV2: 313 break; 314 default: 315 if (ws.a != NULL && ws.a->type == RIP_AUTH_MD5) 316 end_md5_auth(wb,ws.a); 317 if (output(wb->type, &ws.to, ws.ifp, wb->buf, 318 ((char *)wb->n - (char*)wb->buf)) < 0 319 && ws.ifp != NULL) 320 if_sick(ws.ifp); 321 ws.npackets++; 322 break; 323 } 324 325 clr_ws_buf(wb,ws.a); 326} 327 328 329/* put an entry into the packet 330 */ 331static void 332supply_out(struct ag_info *ag) 333{ 334 int i; 335 naddr mask, v1_mask, dst_h, ddst_h = 0; 336 struct ws_buf *wb; 337 338 339 /* Skip this route if doing a flash update and it and the routes 340 * it aggregates have not changed recently. 341 */ 342 if (ag->ag_seqno < update_seqno 343 && (ws.state & WS_ST_FLASH)) 344 return; 345 346 dst_h = ag->ag_dst_h; 347 mask = ag->ag_mask; 348 v1_mask = ripv1_mask_host(htonl(dst_h), 349 (ws.state & WS_ST_TO_ON_NET) ? ws.ifp : 0); 350 i = 0; 351 352 /* If we are sending RIPv2 packets that cannot (or must not) be 353 * heard by RIPv1 listeners, do not worry about sub- or supernets. 354 * Subnets (from other networks) can only be sent via multicast. 355 * A pair of subnet routes might have been promoted so that they 356 * are legal to send by RIPv1. 357 * If RIPv1 is off, use the multicast buffer. 358 */ 359 if ((ws.state & WS_ST_RIP2_ALL) 360 || ((ag->ag_state & AGS_RIPV2) && v1_mask != mask)) { 361 /* use the RIPv2-only buffer */ 362 wb = &v2buf; 363 364 } else { 365 /* use the RIPv1-or-RIPv2 buffer */ 366 wb = &v12buf; 367 368 /* Convert supernet route into corresponding set of network 369 * routes for RIPv1, but leave non-contiguous netmasks 370 * to ag_check(). 371 */ 372 if (v1_mask > mask 373 && mask + (mask & -mask) == 0) { 374 ddst_h = v1_mask & -v1_mask; 375 i = (v1_mask & ~mask)/ddst_h; 376 377 if (i > ws.gen_limit) { 378 /* Punt if we would have to generate an 379 * unreasonable number of routes. 380 */ 381 if (TRACECONTENTS) 382 trace_misc("sending %s-->%s as 1" 383 " instead of %d routes", 384 addrname(htonl(dst_h), mask, 385 1), 386 naddr_ntoa(ws.to.sin_addr 387 .s_addr), 388 i+1); 389 i = 0; 390 391 } else { 392 mask = v1_mask; 393 ws.gen_limit -= i; 394 } 395 } 396 } 397 398 do { 399 wb->n->n_family = RIP_AF_INET; 400 wb->n->n_dst = htonl(dst_h); 401 /* If the route is from router-discovery or we are 402 * shutting down, admit only a bad metric. 403 */ 404 wb->n->n_metric = ((stopint || ag->ag_metric < 1) 405 ? HOPCNT_INFINITY 406 : ag->ag_metric); 407 wb->n->n_metric = htonl(wb->n->n_metric); 408 /* Any non-zero bits in the supposedly unused RIPv1 fields 409 * cause the old `routed` to ignore the route. 410 * That means the mask and so forth cannot be sent 411 * in the hybrid RIPv1/RIPv2 mode. 412 */ 413 if (ws.state & WS_ST_RIP2_ALL) { 414 if (ag->ag_nhop != 0 415 && ((ws.state & WS_ST_QUERY) 416 || (ag->ag_nhop != ws.ifp->int_addr 417 && on_net(ag->ag_nhop, 418 ws.ifp->int_net, 419 ws.ifp->int_mask)))) 420 wb->n->n_nhop = ag->ag_nhop; 421 wb->n->n_mask = htonl(mask); 422 wb->n->n_tag = ag->ag_tag; 423 } 424 dst_h += ddst_h; 425 426 if (++wb->n >= wb->lim) 427 supply_write(wb); 428 } while (i-- != 0); 429} 430 431 432/* supply one route from the table 433 */ 434/* ARGSUSED */ 435static int 436walk_supply(struct radix_node *rn, 437 struct walkarg *argp UNUSED) 438{ 439#define RT ((struct rt_entry *)rn) 440 u_short ags; 441 char metric, pref; 442 naddr dst, nhop; 443 struct rt_spare *rts; 444 int i; 445 446 447 /* Do not advertise external remote interfaces or passive interfaces. 448 */ 449 if ((RT->rt_state & RS_IF) 450 && RT->rt_ifp != 0 451 && (RT->rt_ifp->int_state & IS_PASSIVE) 452 && !(RT->rt_state & RS_MHOME)) 453 return 0; 454 455 /* If being quiet about our ability to forward, then 456 * do not say anything unless responding to a query, 457 * except about our main interface. 458 */ 459 if (!supplier && !(ws.state & WS_ST_QUERY) 460 && !(RT->rt_state & RS_MHOME)) 461 return 0; 462 463 dst = RT->rt_dst; 464 465 /* do not collide with the fake default route */ 466 if (dst == RIP_DEFAULT 467 && (ws.state & WS_ST_DEFAULT)) 468 return 0; 469 470 if (RT->rt_state & RS_NET_SYN) { 471 if (RT->rt_state & RS_NET_INT) { 472 /* Do not send manual synthetic network routes 473 * into the subnet. 474 */ 475 if (on_net(ws.to.sin_addr.s_addr, 476 ntohl(dst), RT->rt_mask)) 477 return 0; 478 479 } else { 480 /* Do not send automatic synthetic network routes 481 * if they are not needed because no RIPv1 listeners 482 * can hear them. 483 */ 484 if (ws.state & WS_ST_RIP2_ALL) 485 return 0; 486 487 /* Do not send automatic synthetic network routes to 488 * the real subnet. 489 */ 490 if (on_net(ws.to.sin_addr.s_addr, 491 ntohl(dst), RT->rt_mask)) 492 return 0; 493 } 494 nhop = 0; 495 496 } else { 497 /* Advertise the next hop if this is not a route for one 498 * of our interfaces and the next hop is on the same 499 * network as the target. 500 * The final determination is made by supply_out(). 501 */ 502 if (!(RT->rt_state & RS_IF) 503 && RT->rt_gate != myaddr 504 && RT->rt_gate != loopaddr) 505 nhop = RT->rt_gate; 506 else 507 nhop = 0; 508 } 509 510 metric = RT->rt_metric; 511 ags = 0; 512 513 if (RT->rt_state & RS_MHOME) { 514 /* retain host route of multi-homed servers */ 515 ; 516 517 } else if (RT_ISHOST(RT)) { 518 /* We should always suppress (into existing network routes) 519 * the host routes for the local end of our point-to-point 520 * links. 521 * If we are suppressing host routes in general, then do so. 522 * Avoid advertising host routes onto their own network, 523 * where they should be handled by proxy-ARP. 524 */ 525 if ((RT->rt_state & RS_LOCAL) 526 || ridhosts 527 || on_net(dst, ws.to_net, ws.to_mask)) 528 ags |= AGS_SUPPRESS; 529 530 /* Aggregate stray host routes into network routes if allowed. 531 * We cannot aggregate host routes into small network routes 532 * without confusing RIPv1 listeners into thinking the 533 * network routes are host routes. 534 */ 535 if ((ws.state & WS_ST_AG) && (ws.state & WS_ST_RIP2_ALL)) 536 ags |= AGS_AGGREGATE; 537 538 } else { 539 /* Always suppress network routes into other, existing 540 * network routes 541 */ 542 ags |= AGS_SUPPRESS; 543 544 /* Generate supernets if allowed. 545 * If we can be heard by RIPv1 systems, we will 546 * later convert back to ordinary nets. 547 * This unifies dealing with received supernets. 548 */ 549 if ((ws.state & WS_ST_AG) 550 && ((RT->rt_state & RS_SUBNET) 551 || (ws.state & WS_ST_SUPER_AG))) 552 ags |= AGS_AGGREGATE; 553 } 554 555 /* Do not send RIPv1 advertisements of subnets to other 556 * networks. If possible, multicast them by RIPv2. 557 */ 558 if ((RT->rt_state & RS_SUBNET) 559 && !(ws.state & WS_ST_RIP2_ALL) 560 && !on_net(dst, ws.to_std_net, ws.to_std_mask)) 561 ags |= AGS_RIPV2 | AGS_AGGREGATE; 562 563 564 /* Do not send a route back to where it came from, except in 565 * response to a query. This is "split-horizon". That means not 566 * advertising back to the same network and so via the same interface. 567 * 568 * We want to suppress routes that might have been fragmented 569 * from this route by a RIPv1 router and sent back to us, and so we 570 * cannot forget this route here. Let the split-horizon route 571 * suppress the fragmented routes and then itself be forgotten. 572 * 573 * Include the routes for both ends of point-to-point interfaces 574 * among those suppressed by split-horizon, since the other side 575 * should knows them as well as we do. 576 * 577 * Notice spare routes with the same metric that we are about to 578 * advertise, to split the horizon on redundant, inactive paths. 579 * 580 * Do not suppress advertisements of interface-related addresses on 581 * non-point-to-point interfaces. This ensures that we have something 582 * to say every 30 seconds to help detect broken Ethernets or 583 * other interfaces where one packet every 30 seconds costs nothing. 584 */ 585 if (ws.ifp != NULL 586 && !(ws.state & WS_ST_QUERY) 587 && (ws.state & WS_ST_TO_ON_NET) 588 && (!(RT->rt_state & RS_IF) 589 || ws.ifp->int_if_flags & IFF_POINTOPOINT)) { 590 for (rts = RT->rt_spares, i = NUM_SPARES; i != 0; i--, rts++) { 591 if (rts->rts_metric > metric 592 || rts->rts_ifp != ws.ifp) 593 continue; 594 595 /* If we do not mark the route with AGS_SPLIT_HZ here, 596 * it will be poisoned-reverse, or advertised back 597 * toward its source with an infinite metric. 598 * If we have recently advertised the route with a 599 * better metric than we now have, then we should 600 * poison-reverse the route before suppressing it for 601 * split-horizon. 602 * 603 * In almost all cases, if there is no spare for the 604 * route then it is either old and dead or a brand 605 * new route. If it is brand new, there is no need 606 * for poison-reverse. If it is old and dead, it 607 * is already poisoned. 608 */ 609 if (RT->rt_poison_time < now_expire 610 || RT->rt_poison_metric >= metric 611 || RT->rt_spares[1].rts_gate == 0) { 612 ags |= AGS_SPLIT_HZ; 613 ags &= ~AGS_SUPPRESS; 614 } 615 metric = HOPCNT_INFINITY; 616 break; 617 } 618 } 619 620 /* Keep track of the best metric with which the 621 * route has been advertised recently. 622 */ 623 if (RT->rt_poison_metric >= metric 624 || RT->rt_poison_time < now_expire) { 625 RT->rt_poison_time = now.tv_sec; 626 RT->rt_poison_metric = metric; 627 } 628 629 /* Adjust the outgoing metric by the cost of the link. 630 * Avoid aggregation when a route is counting to infinity. 631 */ 632 pref = RT->rt_poison_metric + ws.metric; 633 metric += ws.metric; 634 635 /* Do not advertise stable routes that will be ignored, 636 * unless we are answering a query. 637 * If the route recently was advertised with a metric that 638 * would have been less than infinity through this interface, 639 * we need to continue to advertise it in order to poison it. 640 */ 641 if (metric >= HOPCNT_INFINITY) { 642 if (!(ws.state & WS_ST_QUERY) 643 && (pref >= HOPCNT_INFINITY 644 || RT->rt_poison_time < now_garbage)) 645 return 0; 646 647 metric = HOPCNT_INFINITY; 648 } 649 650 ag_check(dst, RT->rt_mask, 0, nhop, metric, pref, 651 RT->rt_seqno, RT->rt_tag, ags, supply_out); 652 return 0; 653#undef RT 654} 655 656 657/* Supply dst with the contents of the routing tables. 658 * If this won't fit in one packet, chop it up into several. 659 */ 660void 661supply(struct sockaddr_in *dst, 662 struct interface *ifp, /* output interface */ 663 enum output_type type, 664 int flash, /* 1=flash update */ 665 int vers, /* RIP version */ 666 int passwd_ok) /* OK to include cleartext password */ 667{ 668 struct rt_entry *rt; 669 int def_metric; 670 671 ws.state = 0; 672 ws.gen_limit = 1024; 673 674 ws.to = *dst; 675 ws.to_std_mask = std_mask(ws.to.sin_addr.s_addr); 676 ws.to_std_net = ntohl(ws.to.sin_addr.s_addr) & ws.to_std_mask; 677 678 if (ifp != NULL) { 679 ws.to_mask = ifp->int_mask; 680 ws.to_net = ifp->int_net; 681 if (on_net(ws.to.sin_addr.s_addr, ws.to_net, ws.to_mask)) 682 ws.state |= WS_ST_TO_ON_NET; 683 684 } else { 685 ws.to_mask = ripv1_mask_net(ws.to.sin_addr.s_addr, 0); 686 ws.to_net = ntohl(ws.to.sin_addr.s_addr) & ws.to_mask; 687 rt = rtfind(dst->sin_addr.s_addr); 688 if (rt) 689 ifp = rt->rt_ifp; 690 } 691 692 ws.npackets = 0; 693 if (flash) 694 ws.state |= WS_ST_FLASH; 695 696 if ((ws.ifp = ifp) == NULL) { 697 ws.metric = 1; 698 } else { 699 /* Adjust the advertised metric by the outgoing interface 700 * metric. 701 */ 702 ws.metric = ifp->int_metric + 1 + ifp->int_adj_outmetric; 703 } 704 705 ripv12_buf.rip.rip_vers = vers; 706 707 switch (type) { 708 case OUT_MULTICAST: 709 if (ifp != NULL && ifp->int_if_flags & IFF_MULTICAST) 710 v2buf.type = OUT_MULTICAST; 711 else 712 v2buf.type = NO_OUT_MULTICAST; 713 v12buf.type = OUT_BROADCAST; 714 break; 715 716 case OUT_QUERY: 717 ws.state |= WS_ST_QUERY; 718 /* FALLTHROUGH */ 719 case OUT_BROADCAST: 720 case OUT_UNICAST: 721 v2buf.type = (vers == RIPv2) ? type : NO_OUT_RIPV2; 722 v12buf.type = type; 723 break; 724 725 case NO_OUT_MULTICAST: 726 case NO_OUT_RIPV2: 727 break; /* no output */ 728 } 729 730 if (vers == RIPv2) { 731 /* full RIPv2 only if cannot be heard by RIPv1 listeners */ 732 if (type != OUT_BROADCAST) 733 ws.state |= WS_ST_RIP2_ALL; 734 if ((ws.state & WS_ST_QUERY) 735 || !(ws.state & WS_ST_TO_ON_NET)) { 736 ws.state |= (WS_ST_AG | WS_ST_SUPER_AG); 737 } else if (ifp == NULL || !(ifp->int_state & IS_NO_AG)) { 738 ws.state |= WS_ST_AG; 739 if (type != OUT_BROADCAST 740 && (ifp == NULL 741 || !(ifp->int_state & IS_NO_SUPER_AG))) 742 ws.state |= WS_ST_SUPER_AG; 743 } 744 } 745 746 ws.a = (vers == RIPv2) ? find_auth(ifp) : 0; 747 if (!passwd_ok && ws.a != NULL && ws.a->type == RIP_AUTH_PW) 748 ws.a = NULL; 749 clr_ws_buf(&v12buf,ws.a); 750 clr_ws_buf(&v2buf,ws.a); 751 752 /* Fake a default route if asked and if there is not already 753 * a better, real default route. 754 */ 755 if (supplier && ifp && (def_metric = ifp->int_d_metric) != 0) { 756 if ((rt = rtget(RIP_DEFAULT, 0)) == NULL 757 || rt->rt_metric+ws.metric >= def_metric) { 758 ws.state |= WS_ST_DEFAULT; 759 ag_check(0, 0, 0, 0, def_metric, def_metric, 760 0, 0, 0, supply_out); 761 } else { 762 def_metric = rt->rt_metric+ws.metric; 763 } 764 765 /* If both RIPv2 and the poor-man's router discovery 766 * kludge are on, arrange to advertise an extra 767 * default route via RIPv1. 768 */ 769 if ((ws.state & WS_ST_RIP2_ALL) 770 && (ifp->int_state & IS_PM_RDISC)) { 771 ripv12_buf.rip.rip_vers = RIPv1; 772 v12buf.n->n_family = RIP_AF_INET; 773 v12buf.n->n_dst = htonl(RIP_DEFAULT); 774 v12buf.n->n_metric = htonl(def_metric); 775 v12buf.n++; 776 } 777 } 778 779 (void)rn_walktree(rhead, walk_supply, 0); 780 ag_flush(0,0,supply_out); 781 782 /* Flush the packet buffers, provided they are not empty and 783 * do not contain only the password. 784 */ 785 if (v12buf.n != v12buf.base 786 && (v12buf.n > v12buf.base+1 787 || v12buf.base->n_family != RIP_AF_AUTH)) 788 supply_write(&v12buf); 789 if (v2buf.n != v2buf.base 790 && (v2buf.n > v2buf.base+1 791 || v2buf.base->n_family != RIP_AF_AUTH)) 792 supply_write(&v2buf); 793 794 /* If we sent nothing and this is an answer to a query, send 795 * an empty buffer. 796 */ 797 if (ws.npackets == 0 798 && (ws.state & WS_ST_QUERY)) 799 supply_write(&v12buf); 800} 801 802 803/* send all of the routing table or just do a flash update 804 */ 805void 806rip_bcast(int flash) 807{ 808#ifdef _HAVE_SIN_LEN 809 static struct sockaddr_in dst = {sizeof(dst), AF_INET, 0, {0}, {0}}; 810#else 811 static struct sockaddr_in dst = {AF_INET}; 812#endif 813 struct interface *ifp; 814 enum output_type type; 815 int vers; 816 struct timeval rtime; 817 818 819 need_flash = 0; 820 intvl_random(&rtime, MIN_WAITTIME, MAX_WAITTIME); 821 no_flash = rtime; 822 timevaladd(&no_flash, &now); 823 824 if (rip_sock < 0) 825 return; 826 827 trace_act("send %s and inhibit dynamic updates for %.3f sec", 828 flash ? "dynamic update" : "all routes", 829 rtime.tv_sec + ((float)rtime.tv_usec)/1000000.0); 830 831 LIST_FOREACH(ifp, &ifnet, int_list) { 832 /* Skip interfaces not doing RIP. 833 * Do try broken interfaces to see if they have healed. 834 */ 835 if (IS_RIP_OUT_OFF(ifp->int_state)) 836 continue; 837 838 /* skip turned off interfaces */ 839 if (!iff_up(ifp->int_if_flags)) 840 continue; 841 842 vers = (ifp->int_state & IS_NO_RIPV1_OUT) ? RIPv2 : RIPv1; 843 844 if (ifp->int_if_flags & IFF_BROADCAST) { 845 /* ordinary, hardware interface */ 846 dst.sin_addr.s_addr = ifp->int_brdaddr; 847 848 if (vers == RIPv2 849 && !(ifp->int_state & IS_NO_RIP_MCAST)) { 850 type = OUT_MULTICAST; 851 } else { 852 type = OUT_BROADCAST; 853 } 854 855 } else if (ifp->int_if_flags & IFF_POINTOPOINT) { 856 /* point-to-point hardware interface */ 857 dst.sin_addr.s_addr = ifp->int_dstaddr; 858 if (vers == RIPv2 && 859 ifp->int_if_flags & IFF_MULTICAST && 860 !(ifp->int_state & IS_NO_RIP_MCAST)) { 861 type = OUT_MULTICAST; 862 } else { 863 type = OUT_UNICAST; 864 } 865 866 } else if (ifp->int_state & IS_REMOTE) { 867 /* remote interface */ 868 dst.sin_addr.s_addr = ifp->int_addr; 869 type = OUT_UNICAST; 870 871 } else { 872 /* ATM, HIPPI, etc. */ 873 continue; 874 } 875 876 supply(&dst, ifp, type, flash, vers, 1); 877 } 878 879 update_seqno++; /* all routes are up to date */ 880} 881 882 883/* Ask for routes 884 * Do it only once to an interface, and not even after the interface 885 * was broken and recovered. 886 */ 887void 888rip_query(void) 889{ 890#ifdef _HAVE_SIN_LEN 891 static struct sockaddr_in dst = {sizeof(dst), AF_INET, 0, {0}, {0}}; 892#else 893 static struct sockaddr_in dst = {AF_INET}; 894#endif 895 struct interface *ifp; 896 struct rip buf; 897 enum output_type type; 898 899 900 if (rip_sock < 0) 901 return; 902 903 memset(&buf, 0, sizeof(buf)); 904 905 LIST_FOREACH(ifp, &ifnet, int_list) { 906 /* Skip interfaces those already queried. 907 * Do not ask via interfaces through which we don't 908 * accept input. Do not ask via interfaces that cannot 909 * send RIP packets. 910 * Do try broken interfaces to see if they have healed. 911 */ 912 if (IS_RIP_IN_OFF(ifp->int_state) 913 || ifp->int_query_time != NEVER) 914 continue; 915 916 /* skip turned off interfaces */ 917 if (!iff_up(ifp->int_if_flags)) 918 continue; 919 920 buf.rip_vers = (ifp->int_state&IS_NO_RIPV1_OUT) ? RIPv2:RIPv1; 921 buf.rip_cmd = RIPCMD_REQUEST; 922 buf.rip_nets[0].n_family = RIP_AF_UNSPEC; 923 buf.rip_nets[0].n_metric = htonl(HOPCNT_INFINITY); 924 925 /* Send a RIPv1 query only if allowed and if we will 926 * listen to RIPv1 routers. 927 */ 928 if ((ifp->int_state & IS_NO_RIPV1_OUT) 929 || (ifp->int_state & IS_NO_RIPV1_IN)) { 930 buf.rip_vers = RIPv2; 931 } else { 932 buf.rip_vers = RIPv1; 933 } 934 935 if (ifp->int_if_flags & IFF_BROADCAST) { 936 /* ordinary, hardware interface */ 937 dst.sin_addr.s_addr = ifp->int_brdaddr; 938 939 /* Broadcast RIPv1 queries and RIPv2 queries 940 * when the hardware cannot multicast. 941 */ 942 if (buf.rip_vers == RIPv2 943 && (ifp->int_if_flags & IFF_MULTICAST) 944 && !(ifp->int_state & IS_NO_RIP_MCAST)) { 945 type = OUT_MULTICAST; 946 } else { 947 type = OUT_BROADCAST; 948 } 949 950 } else if (ifp->int_if_flags & IFF_POINTOPOINT) { 951 /* point-to-point hardware interface */ 952 dst.sin_addr.s_addr = ifp->int_dstaddr; 953 type = OUT_UNICAST; 954 955 } else if (ifp->int_state & IS_REMOTE) { 956 /* remote interface */ 957 dst.sin_addr.s_addr = ifp->int_addr; 958 type = OUT_UNICAST; 959 960 } else { 961 /* ATM, HIPPI, etc. */ 962 continue; 963 } 964 965 ifp->int_query_time = now.tv_sec+SUPPLY_INTERVAL; 966 if (output(type, &dst, ifp, &buf, sizeof(buf)) < 0) 967 if_sick(ifp); 968 } 969} 970