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#ifdef __NetBSD__ 37__RCSID("$NetBSD$"); 38#elif defined(__FreeBSD__) 39__RCSID("$FreeBSD$"); 40#else 41__RCSID("$Revision: 2.27 $"); 42#ident "$Revision: 2.27 $" 43#endif 44 45 46u_int update_seqno; 47 48 49/* walk the tree of routes with this for output 50 */ 51static struct { 52 struct sockaddr_in to; 53 naddr to_mask; 54 naddr to_net; 55 naddr to_std_mask; 56 naddr to_std_net; 57 struct interface *ifp; /* usually output interface */ 58 struct auth *a; 59 char metric; /* adjust metrics by interface */ 60 int npackets; 61 int gen_limit; 62 u_int state; 63#define WS_ST_FLASH 0x001 /* send only changed routes */ 64#define WS_ST_RIP2_ALL 0x002 /* send full featured RIPv2 */ 65#define WS_ST_AG 0x004 /* ok to aggregate subnets */ 66#define WS_ST_SUPER_AG 0x008 /* ok to aggregate networks */ 67#define WS_ST_QUERY 0x010 /* responding to a query */ 68#define WS_ST_TO_ON_NET 0x020 /* sending onto one of our nets */ 69#define WS_ST_DEFAULT 0x040 /* faking a default */ 70} ws; 71 72/* A buffer for what can be heard by both RIPv1 and RIPv2 listeners */ 73struct ws_buf v12buf; 74static union pkt_buf ripv12_buf; 75 76/* Another for only RIPv2 listeners */ 77static struct ws_buf v2buf; 78static union pkt_buf rip_v2_buf; 79 80 81 82void 83bufinit(void) 84{ 85 ripv12_buf.rip.rip_cmd = RIPCMD_RESPONSE; 86 v12buf.buf = &ripv12_buf.rip; 87 v12buf.base = &v12buf.buf->rip_nets[0]; 88 89 rip_v2_buf.rip.rip_cmd = RIPCMD_RESPONSE; 90 rip_v2_buf.rip.rip_vers = RIPv2; 91 v2buf.buf = &rip_v2_buf.rip; 92 v2buf.base = &v2buf.buf->rip_nets[0]; 93} 94 95 96/* Send the contents of the global buffer via the non-multicast socket 97 */ 98int /* <0 on failure */ 99output(enum output_type type, 100 struct sockaddr_in *dst, /* send to here */ 101 struct interface *ifp, 102 struct rip *buf, 103 int size) /* this many bytes */ 104{ 105 struct sockaddr_in osin; 106 int flags; 107 const char *msg; 108 int res; 109 int soc; 110 int serrno; 111 112 assert(ifp != NULL); 113 osin = *dst; 114 if (osin.sin_port == 0) 115 osin.sin_port = htons(RIP_PORT); 116#ifdef _HAVE_SIN_LEN 117 if (osin.sin_len == 0) 118 osin.sin_len = sizeof(osin); 119#endif 120 121 soc = rip_sock; 122 flags = 0; 123 124 switch (type) { 125 case OUT_QUERY: 126 msg = "Answer Query"; 127 if (soc < 0) 128 soc = ifp->int_rip_sock; 129 break; 130 case OUT_UNICAST: 131 msg = "Send"; 132 if (soc < 0) 133 soc = ifp->int_rip_sock; 134 flags = MSG_DONTROUTE; 135 break; 136 case OUT_BROADCAST: 137 if (ifp->int_if_flags & IFF_POINTOPOINT) { 138 msg = "Send"; 139 } else { 140 msg = "Send bcast"; 141 } 142 flags = MSG_DONTROUTE; 143 break; 144 case OUT_MULTICAST: 145 if ((ifp->int_if_flags & (IFF_POINTOPOINT|IFF_MULTICAST)) == 146 IFF_POINTOPOINT) { 147 msg = "Send pt-to-pt"; 148 } else if (ifp->int_state & IS_DUP) { 149 trace_act("abort multicast output via %s" 150 " with duplicate address", 151 ifp->int_name); 152 return 0; 153 } else { 154 msg = "Send mcast"; 155 if (rip_sock_mcast != ifp) { 156 struct ip_mreqn mreqn; 157 158 memset(&mreqn, 0, sizeof(struct ip_mreqn)); 159 mreqn.imr_ifindex = ifp->int_index; 160 if (0 > setsockopt(rip_sock, 161 IPPROTO_IP, 162 IP_MULTICAST_IF, 163 &mreqn, 164 sizeof(mreqn))) { 165 serrno = errno; 166 LOGERR("setsockopt(rip_sock, " 167 "IP_MULTICAST_IF)"); 168 errno = serrno; 169 ifp = NULL; 170 return -1; 171 } 172 rip_sock_mcast = ifp; 173 } 174 osin.sin_addr.s_addr = htonl(INADDR_RIP_GROUP); 175 } 176 break; 177 178 case NO_OUT_MULTICAST: 179 case NO_OUT_RIPV2: 180 default: 181#ifdef DEBUG 182 abort(); 183#endif 184 return -1; 185 } 186 187 trace_rip(msg, "to", &osin, ifp, buf, size); 188 189 res = sendto(soc, buf, size, flags, 190 (struct sockaddr *)&osin, sizeof(osin)); 191 if (res < 0 192 && (ifp == NULL || !(ifp->int_state & IS_BROKE))) { 193 serrno = errno; 194 msglog("%s sendto(%s%s%s.%d): %s", msg, 195 ifp != NULL ? ifp->int_name : "", 196 ifp != NULL ? ", " : "", 197 inet_ntoa(osin.sin_addr), 198 ntohs(osin.sin_port), 199 strerror(errno)); 200 errno = serrno; 201 } 202 203 return res; 204} 205 206 207/* Find the first key for a packet to send. 208 * Try for a key that is eligible and has not expired, but settle for 209 * the last key if they have all expired. 210 * If no key is ready yet, give up. 211 */ 212struct auth * 213find_auth(struct interface *ifp) 214{ 215 struct auth *ap, *res; 216 int i; 217 218 219 if (ifp == NULL) 220 return 0; 221 222 res = NULL; 223 ap = ifp->int_auth; 224 for (i = 0; i < MAX_AUTH_KEYS; i++, ap++) { 225 /* stop looking after the last key */ 226 if (ap->type == RIP_AUTH_NONE) 227 break; 228 229 /* ignore keys that are not ready yet */ 230 if ((u_long)ap->start > (u_long)clk.tv_sec) 231 continue; 232 233 if ((u_long)ap->end < (u_long)clk.tv_sec) { 234 /* note best expired password as a fall-back */ 235 if (res == NULL || (u_long)ap->end > (u_long)res->end) 236 res = ap; 237 continue; 238 } 239 240 /* note key with the best future */ 241 if (res == NULL || (u_long)res->end < (u_long)ap->end) 242 res = ap; 243 } 244 return res; 245} 246 247 248void 249clr_ws_buf(struct ws_buf *wb, 250 struct auth *ap) 251{ 252 struct netauth *na; 253 254 wb->lim = wb->base + NETS_LEN; 255 wb->n = wb->base; 256 memset(wb->n, 0, NETS_LEN*sizeof(*wb->n)); 257 258 /* (start to) install authentication if appropriate 259 */ 260 if (ap == NULL) 261 return; 262 263 na = (struct netauth*)wb->n; 264 if (ap->type == RIP_AUTH_PW) { 265 na->a_family = RIP_AF_AUTH; 266 na->a_type = RIP_AUTH_PW; 267 memcpy(na->au.au_pw, ap->key, sizeof(na->au.au_pw)); 268 wb->n++; 269 270 } else if (ap->type == RIP_AUTH_MD5) { 271 na->a_family = RIP_AF_AUTH; 272 na->a_type = RIP_AUTH_MD5; 273 na->au.a_md5.md5_keyid = ap->keyid; 274 na->au.a_md5.md5_auth_len = RIP_AUTH_MD5_KEY_LEN; 275 na->au.a_md5.md5_seqno = htonl(clk.tv_sec); 276 wb->n++; 277 wb->lim--; /* make room for trailer */ 278 } 279} 280 281 282void 283end_md5_auth(struct ws_buf *wb, 284 struct auth *ap) 285{ 286 struct netauth *na, *na2; 287 MD5_CTX md5_ctx; 288 int len; 289 290 291 na = (struct netauth*)wb->base; 292 na2 = (struct netauth*)wb->n; 293 len = (char *)na2-(char *)wb->buf; 294 na2->a_family = RIP_AF_AUTH; 295 na2->a_type = htons(1); 296 na->au.a_md5.md5_pkt_len = htons(len); 297 MD5Init(&md5_ctx); 298 MD5Update(&md5_ctx, (u_char *)wb->buf, len + RIP_AUTH_MD5_HASH_XTRA); 299 MD5Update(&md5_ctx, ap->key, RIP_AUTH_MD5_KEY_LEN); 300 MD5Final(na2->au.au_pw, &md5_ctx); 301 wb->n++; 302} 303 304 305/* Send the buffer 306 */ 307static void 308supply_write(struct ws_buf *wb) 309{ 310 /* Output multicast only if legal. 311 * If we would multicast and it would be illegal, then discard the 312 * packet. 313 */ 314 switch (wb->type) { 315 case NO_OUT_MULTICAST: 316 trace_pkt("skip multicast to %s because impossible", 317 naddr_ntoa(ws.to.sin_addr.s_addr)); 318 break; 319 case NO_OUT_RIPV2: 320 break; 321 default: 322 if (ws.a != NULL && ws.a->type == RIP_AUTH_MD5) 323 end_md5_auth(wb,ws.a); 324 if (output(wb->type, &ws.to, ws.ifp, wb->buf, 325 ((char *)wb->n - (char*)wb->buf)) < 0 326 && ws.ifp != NULL) 327 if_sick(ws.ifp); 328 ws.npackets++; 329 break; 330 } 331 332 clr_ws_buf(wb,ws.a); 333} 334 335 336/* put an entry into the packet 337 */ 338static void 339supply_out(struct ag_info *ag) 340{ 341 int i; 342 naddr mask, v1_mask, dst_h, ddst_h = 0; 343 struct ws_buf *wb; 344 345 346 /* Skip this route if doing a flash update and it and the routes 347 * it aggregates have not changed recently. 348 */ 349 if (ag->ag_seqno < update_seqno 350 && (ws.state & WS_ST_FLASH)) 351 return; 352 353 dst_h = ag->ag_dst_h; 354 mask = ag->ag_mask; 355 v1_mask = ripv1_mask_host(htonl(dst_h), 356 (ws.state & WS_ST_TO_ON_NET) ? ws.ifp : 0); 357 i = 0; 358 359 /* If we are sending RIPv2 packets that cannot (or must not) be 360 * heard by RIPv1 listeners, do not worry about sub- or supernets. 361 * Subnets (from other networks) can only be sent via multicast. 362 * A pair of subnet routes might have been promoted so that they 363 * are legal to send by RIPv1. 364 * If RIPv1 is off, use the multicast buffer. 365 */ 366 if ((ws.state & WS_ST_RIP2_ALL) 367 || ((ag->ag_state & AGS_RIPV2) && v1_mask != mask)) { 368 /* use the RIPv2-only buffer */ 369 wb = &v2buf; 370 371 } else { 372 /* use the RIPv1-or-RIPv2 buffer */ 373 wb = &v12buf; 374 375 /* Convert supernet route into corresponding set of network 376 * routes for RIPv1, but leave non-contiguous netmasks 377 * to ag_check(). 378 */ 379 if (v1_mask > mask 380 && mask + (mask & -mask) == 0) { 381 ddst_h = v1_mask & -v1_mask; 382 i = (v1_mask & ~mask)/ddst_h; 383 384 if (i > ws.gen_limit) { 385 /* Punt if we would have to generate an 386 * unreasonable number of routes. 387 */ 388 if (TRACECONTENTS) 389 trace_misc("sending %s-->%s as 1" 390 " instead of %d routes", 391 addrname(htonl(dst_h), mask, 392 1), 393 naddr_ntoa(ws.to.sin_addr 394 .s_addr), 395 i+1); 396 i = 0; 397 398 } else { 399 mask = v1_mask; 400 ws.gen_limit -= i; 401 } 402 } 403 } 404 405 do { 406 wb->n->n_family = RIP_AF_INET; 407 wb->n->n_dst = htonl(dst_h); 408 /* If the route is from router-discovery or we are 409 * shutting down, admit only a bad metric. 410 */ 411 wb->n->n_metric = ((stopint || ag->ag_metric < 1) 412 ? HOPCNT_INFINITY 413 : ag->ag_metric); 414 wb->n->n_metric = htonl(wb->n->n_metric); 415 /* Any non-zero bits in the supposedly unused RIPv1 fields 416 * cause the old `routed` to ignore the route. 417 * That means the mask and so forth cannot be sent 418 * in the hybrid RIPv1/RIPv2 mode. 419 */ 420 if (ws.state & WS_ST_RIP2_ALL) { 421 if (ag->ag_nhop != 0 422 && ((ws.state & WS_ST_QUERY) 423 || (ag->ag_nhop != ws.ifp->int_addr 424 && on_net(ag->ag_nhop, 425 ws.ifp->int_net, 426 ws.ifp->int_mask)))) 427 wb->n->n_nhop = ag->ag_nhop; 428 wb->n->n_mask = htonl(mask); 429 wb->n->n_tag = ag->ag_tag; 430 } 431 dst_h += ddst_h; 432 433 if (++wb->n >= wb->lim) 434 supply_write(wb); 435 } while (i-- != 0); 436} 437 438 439/* supply one route from the table 440 */ 441/* ARGSUSED */ 442static int 443walk_supply(struct radix_node *rn, 444 struct walkarg *argp UNUSED) 445{ 446#define RT ((struct rt_entry *)rn) 447 u_short ags; 448 char metric, pref; 449 naddr dst, nhop; 450 struct rt_spare *rts; 451 int i; 452 453 454 /* Do not advertise external remote interfaces or passive interfaces. 455 */ 456 if ((RT->rt_state & RS_IF) 457 && RT->rt_ifp != 0 458 && (RT->rt_ifp->int_state & IS_PASSIVE) 459 && !(RT->rt_state & RS_MHOME)) 460 return 0; 461 462 /* If being quiet about our ability to forward, then 463 * do not say anything unless responding to a query, 464 * except about our main interface. 465 */ 466 if (!supplier && !(ws.state & WS_ST_QUERY) 467 && !(RT->rt_state & RS_MHOME)) 468 return 0; 469 470 dst = RT->rt_dst; 471 472 /* do not collide with the fake default route */ 473 if (dst == RIP_DEFAULT 474 && (ws.state & WS_ST_DEFAULT)) 475 return 0; 476 477 if (RT->rt_state & RS_NET_SYN) { 478 if (RT->rt_state & RS_NET_INT) { 479 /* Do not send manual synthetic network routes 480 * into the subnet. 481 */ 482 if (on_net(ws.to.sin_addr.s_addr, 483 ntohl(dst), RT->rt_mask)) 484 return 0; 485 486 } else { 487 /* Do not send automatic synthetic network routes 488 * if they are not needed because no RIPv1 listeners 489 * can hear them. 490 */ 491 if (ws.state & WS_ST_RIP2_ALL) 492 return 0; 493 494 /* Do not send automatic synthetic network routes to 495 * the real subnet. 496 */ 497 if (on_net(ws.to.sin_addr.s_addr, 498 ntohl(dst), RT->rt_mask)) 499 return 0; 500 } 501 nhop = 0; 502 503 } else { 504 /* Advertise the next hop if this is not a route for one 505 * of our interfaces and the next hop is on the same 506 * network as the target. 507 * The final determination is made by supply_out(). 508 */ 509 if (!(RT->rt_state & RS_IF) 510 && RT->rt_gate != myaddr 511 && RT->rt_gate != loopaddr) 512 nhop = RT->rt_gate; 513 else 514 nhop = 0; 515 } 516 517 metric = RT->rt_metric; 518 ags = 0; 519 520 if (RT->rt_state & RS_MHOME) { 521 /* retain host route of multi-homed servers */ 522 ; 523 524 } else if (RT_ISHOST(RT)) { 525 /* We should always suppress (into existing network routes) 526 * the host routes for the local end of our point-to-point 527 * links. 528 * If we are suppressing host routes in general, then do so. 529 * Avoid advertising host routes onto their own network, 530 * where they should be handled by proxy-ARP. 531 */ 532 if ((RT->rt_state & RS_LOCAL) 533 || ridhosts 534 || on_net(dst, ws.to_net, ws.to_mask)) 535 ags |= AGS_SUPPRESS; 536 537 /* Aggregate stray host routes into network routes if allowed. 538 * We cannot aggregate host routes into small network routes 539 * without confusing RIPv1 listeners into thinking the 540 * network routes are host routes. 541 */ 542 if ((ws.state & WS_ST_AG) && (ws.state & WS_ST_RIP2_ALL)) 543 ags |= AGS_AGGREGATE; 544 545 } else { 546 /* Always suppress network routes into other, existing 547 * network routes 548 */ 549 ags |= AGS_SUPPRESS; 550 551 /* Generate supernets if allowed. 552 * If we can be heard by RIPv1 systems, we will 553 * later convert back to ordinary nets. 554 * This unifies dealing with received supernets. 555 */ 556 if ((ws.state & WS_ST_AG) 557 && ((RT->rt_state & RS_SUBNET) 558 || (ws.state & WS_ST_SUPER_AG))) 559 ags |= AGS_AGGREGATE; 560 } 561 562 /* Do not send RIPv1 advertisements of subnets to other 563 * networks. If possible, multicast them by RIPv2. 564 */ 565 if ((RT->rt_state & RS_SUBNET) 566 && !(ws.state & WS_ST_RIP2_ALL) 567 && !on_net(dst, ws.to_std_net, ws.to_std_mask)) 568 ags |= AGS_RIPV2 | AGS_AGGREGATE; 569 570 571 /* Do not send a route back to where it came from, except in 572 * response to a query. This is "split-horizon". That means not 573 * advertising back to the same network and so via the same interface. 574 * 575 * We want to suppress routes that might have been fragmented 576 * from this route by a RIPv1 router and sent back to us, and so we 577 * cannot forget this route here. Let the split-horizon route 578 * suppress the fragmented routes and then itself be forgotten. 579 * 580 * Include the routes for both ends of point-to-point interfaces 581 * among those suppressed by split-horizon, since the other side 582 * should knows them as well as we do. 583 * 584 * Notice spare routes with the same metric that we are about to 585 * advertise, to split the horizon on redundant, inactive paths. 586 * 587 * Do not suppress advertisements of interface-related addresses on 588 * non-point-to-point interfaces. This ensures that we have something 589 * to say every 30 seconds to help detect broken Ethernets or 590 * other interfaces where one packet every 30 seconds costs nothing. 591 */ 592 if (ws.ifp != NULL 593 && !(ws.state & WS_ST_QUERY) 594 && (ws.state & WS_ST_TO_ON_NET) 595 && (!(RT->rt_state & RS_IF) 596 || ws.ifp->int_if_flags & IFF_POINTOPOINT)) { 597 for (rts = RT->rt_spares, i = NUM_SPARES; i != 0; i--, rts++) { 598 if (rts->rts_metric > metric 599 || rts->rts_ifp != ws.ifp) 600 continue; 601 602 /* If we do not mark the route with AGS_SPLIT_HZ here, 603 * it will be poisoned-reverse, or advertised back 604 * toward its source with an infinite metric. 605 * If we have recently advertised the route with a 606 * better metric than we now have, then we should 607 * poison-reverse the route before suppressing it for 608 * split-horizon. 609 * 610 * In almost all cases, if there is no spare for the 611 * route then it is either old and dead or a brand 612 * new route. If it is brand new, there is no need 613 * for poison-reverse. If it is old and dead, it 614 * is already poisoned. 615 */ 616 if (RT->rt_poison_time < now_expire 617 || RT->rt_poison_metric >= metric 618 || RT->rt_spares[1].rts_gate == 0) { 619 ags |= AGS_SPLIT_HZ; 620 ags &= ~AGS_SUPPRESS; 621 } 622 metric = HOPCNT_INFINITY; 623 break; 624 } 625 } 626 627 /* Keep track of the best metric with which the 628 * route has been advertised recently. 629 */ 630 if (RT->rt_poison_metric >= metric 631 || RT->rt_poison_time < now_expire) { 632 RT->rt_poison_time = now.tv_sec; 633 RT->rt_poison_metric = metric; 634 } 635 636 /* Adjust the outgoing metric by the cost of the link. 637 * Avoid aggregation when a route is counting to infinity. 638 */ 639 pref = RT->rt_poison_metric + ws.metric; 640 metric += ws.metric; 641 642 /* Do not advertise stable routes that will be ignored, 643 * unless we are answering a query. 644 * If the route recently was advertised with a metric that 645 * would have been less than infinity through this interface, 646 * we need to continue to advertise it in order to poison it. 647 */ 648 if (metric >= HOPCNT_INFINITY) { 649 if (!(ws.state & WS_ST_QUERY) 650 && (pref >= HOPCNT_INFINITY 651 || RT->rt_poison_time < now_garbage)) 652 return 0; 653 654 metric = HOPCNT_INFINITY; 655 } 656 657 ag_check(dst, RT->rt_mask, 0, nhop, metric, pref, 658 RT->rt_seqno, RT->rt_tag, ags, supply_out); 659 return 0; 660#undef RT 661} 662 663 664/* Supply dst with the contents of the routing tables. 665 * If this won't fit in one packet, chop it up into several. 666 */ 667void 668supply(struct sockaddr_in *dst, 669 struct interface *ifp, /* output interface */ 670 enum output_type type, 671 int flash, /* 1=flash update */ 672 int vers, /* RIP version */ 673 int passwd_ok) /* OK to include cleartext password */ 674{ 675 struct rt_entry *rt; 676 int def_metric; 677 678 ws.state = 0; 679 ws.gen_limit = 1024; 680 681 ws.to = *dst; 682 ws.to_std_mask = std_mask(ws.to.sin_addr.s_addr); 683 ws.to_std_net = ntohl(ws.to.sin_addr.s_addr) & ws.to_std_mask; 684 685 if (ifp != NULL) { 686 ws.to_mask = ifp->int_mask; 687 ws.to_net = ifp->int_net; 688 if (on_net(ws.to.sin_addr.s_addr, ws.to_net, ws.to_mask)) 689 ws.state |= WS_ST_TO_ON_NET; 690 691 } else { 692 ws.to_mask = ripv1_mask_net(ws.to.sin_addr.s_addr, 0); 693 ws.to_net = ntohl(ws.to.sin_addr.s_addr) & ws.to_mask; 694 rt = rtfind(dst->sin_addr.s_addr); 695 if (rt) 696 ifp = rt->rt_ifp; 697 } 698 699 ws.npackets = 0; 700 if (flash) 701 ws.state |= WS_ST_FLASH; 702 703 if ((ws.ifp = ifp) == NULL) { 704 ws.metric = 1; 705 } else { 706 /* Adjust the advertised metric by the outgoing interface 707 * metric. 708 */ 709 ws.metric = ifp->int_metric + 1 + ifp->int_adj_outmetric; 710 } 711 712 ripv12_buf.rip.rip_vers = vers; 713 714 switch (type) { 715 case OUT_MULTICAST: 716 if (ifp != NULL && ifp->int_if_flags & IFF_MULTICAST) 717 v2buf.type = OUT_MULTICAST; 718 else 719 v2buf.type = NO_OUT_MULTICAST; 720 v12buf.type = OUT_BROADCAST; 721 break; 722 723 case OUT_QUERY: 724 ws.state |= WS_ST_QUERY; 725 /* FALLTHROUGH */ 726 case OUT_BROADCAST: 727 case OUT_UNICAST: 728 v2buf.type = (vers == RIPv2) ? type : NO_OUT_RIPV2; 729 v12buf.type = type; 730 break; 731 732 case NO_OUT_MULTICAST: 733 case NO_OUT_RIPV2: 734 break; /* no output */ 735 } 736 737 if (vers == RIPv2) { 738 /* full RIPv2 only if cannot be heard by RIPv1 listeners */ 739 if (type != OUT_BROADCAST) 740 ws.state |= WS_ST_RIP2_ALL; 741 if ((ws.state & WS_ST_QUERY) 742 || !(ws.state & WS_ST_TO_ON_NET)) { 743 ws.state |= (WS_ST_AG | WS_ST_SUPER_AG); 744 } else if (ifp == NULL || !(ifp->int_state & IS_NO_AG)) { 745 ws.state |= WS_ST_AG; 746 if (type != OUT_BROADCAST 747 && (ifp == NULL 748 || !(ifp->int_state & IS_NO_SUPER_AG))) 749 ws.state |= WS_ST_SUPER_AG; 750 } 751 } 752 753 ws.a = (vers == RIPv2) ? find_auth(ifp) : 0; 754 if (!passwd_ok && ws.a != NULL && ws.a->type == RIP_AUTH_PW) 755 ws.a = NULL; 756 clr_ws_buf(&v12buf,ws.a); 757 clr_ws_buf(&v2buf,ws.a); 758 759 /* Fake a default route if asked and if there is not already 760 * a better, real default route. 761 */ 762 if (supplier && ifp && (def_metric = ifp->int_d_metric) != 0) { 763 if ((rt = rtget(RIP_DEFAULT, 0)) == NULL 764 || rt->rt_metric+ws.metric >= def_metric) { 765 ws.state |= WS_ST_DEFAULT; 766 ag_check(0, 0, 0, 0, def_metric, def_metric, 767 0, 0, 0, supply_out); 768 } else { 769 def_metric = rt->rt_metric+ws.metric; 770 } 771 772 /* If both RIPv2 and the poor-man's router discovery 773 * kludge are on, arrange to advertise an extra 774 * default route via RIPv1. 775 */ 776 if ((ws.state & WS_ST_RIP2_ALL) 777 && (ifp->int_state & IS_PM_RDISC)) { 778 ripv12_buf.rip.rip_vers = RIPv1; 779 v12buf.n->n_family = RIP_AF_INET; 780 v12buf.n->n_dst = htonl(RIP_DEFAULT); 781 v12buf.n->n_metric = htonl(def_metric); 782 v12buf.n++; 783 } 784 } 785 786 (void)rn_walktree(rhead, walk_supply, 0); 787 ag_flush(0,0,supply_out); 788 789 /* Flush the packet buffers, provided they are not empty and 790 * do not contain only the password. 791 */ 792 if (v12buf.n != v12buf.base 793 && (v12buf.n > v12buf.base+1 794 || v12buf.base->n_family != RIP_AF_AUTH)) 795 supply_write(&v12buf); 796 if (v2buf.n != v2buf.base 797 && (v2buf.n > v2buf.base+1 798 || v2buf.base->n_family != RIP_AF_AUTH)) 799 supply_write(&v2buf); 800 801 /* If we sent nothing and this is an answer to a query, send 802 * an empty buffer. 803 */ 804 if (ws.npackets == 0 805 && (ws.state & WS_ST_QUERY)) 806 supply_write(&v12buf); 807} 808 809 810/* send all of the routing table or just do a flash update 811 */ 812void 813rip_bcast(int flash) 814{ 815#ifdef _HAVE_SIN_LEN 816 static struct sockaddr_in dst = {sizeof(dst), AF_INET, 0, {0}, {0}}; 817#else 818 static struct sockaddr_in dst = {AF_INET}; 819#endif 820 struct interface *ifp; 821 enum output_type type; 822 int vers; 823 struct timeval rtime; 824 825 826 need_flash = 0; 827 intvl_random(&rtime, MIN_WAITTIME, MAX_WAITTIME); 828 no_flash = rtime; 829 timevaladd(&no_flash, &now); 830 831 if (rip_sock < 0) 832 return; 833 834 trace_act("send %s and inhibit dynamic updates for %.3f sec", 835 flash ? "dynamic update" : "all routes", 836 rtime.tv_sec + ((float)rtime.tv_usec)/1000000.0); 837 838 LIST_FOREACH(ifp, &ifnet, int_list) { 839 /* Skip interfaces not doing RIP. 840 * Do try broken interfaces to see if they have healed. 841 */ 842 if (IS_RIP_OUT_OFF(ifp->int_state)) 843 continue; 844 845 /* skip turned off interfaces */ 846 if (!iff_up(ifp->int_if_flags)) 847 continue; 848 849 vers = (ifp->int_state & IS_NO_RIPV1_OUT) ? RIPv2 : RIPv1; 850 851 if (ifp->int_if_flags & IFF_BROADCAST) { 852 /* ordinary, hardware interface */ 853 dst.sin_addr.s_addr = ifp->int_brdaddr; 854 855 if (vers == RIPv2 856 && !(ifp->int_state & IS_NO_RIP_MCAST)) { 857 type = OUT_MULTICAST; 858 } else { 859 type = OUT_BROADCAST; 860 } 861 862 } else if (ifp->int_if_flags & IFF_POINTOPOINT) { 863 /* point-to-point hardware interface */ 864 dst.sin_addr.s_addr = ifp->int_dstaddr; 865 if (vers == RIPv2 && 866 ifp->int_if_flags & IFF_MULTICAST && 867 !(ifp->int_state & IS_NO_RIP_MCAST)) { 868 type = OUT_MULTICAST; 869 } else { 870 type = OUT_UNICAST; 871 } 872 873 } else if (ifp->int_state & IS_REMOTE) { 874 /* remote interface */ 875 dst.sin_addr.s_addr = ifp->int_addr; 876 type = OUT_UNICAST; 877 878 } else { 879 /* ATM, HIPPI, etc. */ 880 continue; 881 } 882 883 supply(&dst, ifp, type, flash, vers, 1); 884 } 885 886 update_seqno++; /* all routes are up to date */ 887} 888 889 890/* Ask for routes 891 * Do it only once to an interface, and not even after the interface 892 * was broken and recovered. 893 */ 894void 895rip_query(void) 896{ 897#ifdef _HAVE_SIN_LEN 898 static struct sockaddr_in dst = {sizeof(dst), AF_INET, 0, {0}, {0}}; 899#else 900 static struct sockaddr_in dst = {AF_INET}; 901#endif 902 struct interface *ifp; 903 struct rip buf; 904 enum output_type type; 905 906 907 if (rip_sock < 0) 908 return; 909 910 memset(&buf, 0, sizeof(buf)); 911 912 LIST_FOREACH(ifp, &ifnet, int_list) { 913 /* Skip interfaces those already queried. 914 * Do not ask via interfaces through which we don't 915 * accept input. Do not ask via interfaces that cannot 916 * send RIP packets. 917 * Do try broken interfaces to see if they have healed. 918 */ 919 if (IS_RIP_IN_OFF(ifp->int_state) 920 || ifp->int_query_time != NEVER) 921 continue; 922 923 /* skip turned off interfaces */ 924 if (!iff_up(ifp->int_if_flags)) 925 continue; 926 927 buf.rip_vers = (ifp->int_state&IS_NO_RIPV1_OUT) ? RIPv2:RIPv1; 928 buf.rip_cmd = RIPCMD_REQUEST; 929 buf.rip_nets[0].n_family = RIP_AF_UNSPEC; 930 buf.rip_nets[0].n_metric = htonl(HOPCNT_INFINITY); 931 932 /* Send a RIPv1 query only if allowed and if we will 933 * listen to RIPv1 routers. 934 */ 935 if ((ifp->int_state & IS_NO_RIPV1_OUT) 936 || (ifp->int_state & IS_NO_RIPV1_IN)) { 937 buf.rip_vers = RIPv2; 938 } else { 939 buf.rip_vers = RIPv1; 940 } 941 942 if (ifp->int_if_flags & IFF_BROADCAST) { 943 /* ordinary, hardware interface */ 944 dst.sin_addr.s_addr = ifp->int_brdaddr; 945 946 /* Broadcast RIPv1 queries and RIPv2 queries 947 * when the hardware cannot multicast. 948 */ 949 if (buf.rip_vers == RIPv2 950 && (ifp->int_if_flags & IFF_MULTICAST) 951 && !(ifp->int_state & IS_NO_RIP_MCAST)) { 952 type = OUT_MULTICAST; 953 } else { 954 type = OUT_BROADCAST; 955 } 956 957 } else if (ifp->int_if_flags & IFF_POINTOPOINT) { 958 /* point-to-point hardware interface */ 959 dst.sin_addr.s_addr = ifp->int_dstaddr; 960 type = OUT_UNICAST; 961 962 } else if (ifp->int_state & IS_REMOTE) { 963 /* remote interface */ 964 dst.sin_addr.s_addr = ifp->int_addr; 965 type = OUT_UNICAST; 966 967 } else { 968 /* ATM, HIPPI, etc. */ 969 continue; 970 } 971 972 ifp->int_query_time = now.tv_sec+SUPPLY_INTERVAL; 973 if (output(type, &dst, ifp, &buf, sizeof(buf)) < 0) 974 if_sick(ifp); 975 } 976} 977