output.c revision 1.15
1 /* $NetBSD: output.c,v 1.15 1998/06/02 18:02:55 thorpej Exp $ */ 2 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. All advertising materials mentioning features or use of this software 16 * must display the following acknowledgement: 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[] = "@(#)output.c 8.1 (Berkeley) 6/5/93"; 38 #elif defined(__NetBSD__) 39 #include <sys/cdefs.h> 40 __RCSID("$NetBSD: output.c,v 1.15 1998/06/02 18:02:55 thorpej Exp $"); 41 #endif 42 43 #include "defs.h" 44 45 46 int update_seqno; 47 48 49 /* walk the tree of routes with this for output 50 */ 51 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 */ 73 struct ws_buf v12buf; 74 union pkt_buf ripv12_buf; 75 76 /* Another for only RIPv2 listeners */ 77 struct ws_buf v2buf; 78 union pkt_buf rip_v2_buf; 79 80 81 82 void 83 bufinit(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 */ 98 int /* <0 on failure */ 99 output(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 sin; 106 int flags; 107 char *msg; 108 int res; 109 naddr tgt_mcast; 110 int soc; 111 int serrno; 112 113 sin = *dst; 114 if (sin.sin_port == 0) 115 sin.sin_port = htons(RIP_PORT); 116 #ifdef _HAVE_SIN_LEN 117 if (sin.sin_len == 0) 118 sin.sin_len = sizeof(sin); 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) { 146 msg = "Send pt-to-pt"; 147 } else if (ifp->int_state & IS_DUP) { 148 trace_act("abort multicast output via %s" 149 " with duplicate address", 150 ifp->int_name); 151 return 0; 152 } else { 153 msg = "Send mcast"; 154 if (rip_sock_mcast != ifp) { 155 #ifdef MCAST_PPP_BUG 156 /* Do not specifiy the primary interface 157 * explicitly if we have the multicast 158 * point-to-point kernel bug, since the 159 * kernel will do the wrong thing if the 160 * local address of a point-to-point link 161 * is the same as the address of an ordinary 162 * interface. 163 */ 164 if (ifp->int_addr == myaddr) { 165 tgt_mcast = 0; 166 } else 167 #endif 168 tgt_mcast = ifp->int_addr; 169 if (0 > setsockopt(rip_sock, 170 IPPROTO_IP, IP_MULTICAST_IF, 171 &tgt_mcast, 172 sizeof(tgt_mcast))) { 173 serrno = errno; 174 LOGERR("setsockopt(rip_sock," 175 "IP_MULTICAST_IF)"); 176 errno = serrno; 177 ifp = 0; 178 return -1; 179 } 180 rip_sock_mcast = ifp; 181 } 182 sin.sin_addr.s_addr = htonl(INADDR_RIP_GROUP); 183 } 184 break; 185 186 case NO_OUT_MULTICAST: 187 case NO_OUT_RIPV2: 188 default: 189 #ifdef DEBUG 190 abort(); 191 #endif 192 return -1; 193 } 194 195 trace_rip(msg, "to", &sin, ifp, buf, size); 196 197 res = sendto(soc, buf, size, flags, 198 (struct sockaddr *)&sin, sizeof(sin)); 199 if (res < 0 200 && (ifp == 0 || !(ifp->int_state & IS_BROKE))) { 201 serrno = errno; 202 msglog("%s sendto(%s%s%s.%d): %s", msg, 203 ifp != 0 ? ifp->int_name : "", 204 ifp != 0 ? ", " : "", 205 inet_ntoa(sin.sin_addr), 206 ntohs(sin.sin_port), 207 strerror(errno)); 208 errno = serrno; 209 } 210 211 return res; 212 } 213 214 215 /* Find the first key for a packet to send. 216 * Try for a key that is eligable and has not expired, but settle for 217 * the last key if they have all expired. 218 * If no key is ready yet, give up. 219 */ 220 struct auth * 221 find_auth(struct interface *ifp) 222 { 223 struct auth *ap, *res; 224 int i; 225 226 227 if (ifp == 0) 228 return 0; 229 230 res = 0; 231 ap = ifp->int_auth; 232 for (i = 0; i < MAX_AUTH_KEYS; i++, ap++) { 233 /* stop looking after the last key */ 234 if (ap->type == RIP_AUTH_NONE) 235 break; 236 237 /* ignore keys that are not ready yet */ 238 if ((u_long)ap->start > (u_long)clk.tv_sec) 239 continue; 240 241 if ((u_long)ap->end < (u_long)clk.tv_sec) { 242 /* note best expired password as a fall-back */ 243 if (res == 0 || (u_long)ap->end > (u_long)res->end) 244 res = ap; 245 continue; 246 } 247 248 /* note key with the best future */ 249 if (res == 0 || (u_long)res->end < (u_long)ap->end) 250 res = ap; 251 } 252 return res; 253 } 254 255 256 void 257 clr_ws_buf(struct ws_buf *wb, 258 struct auth *ap) 259 { 260 struct netauth *na; 261 262 wb->lim = wb->base + NETS_LEN; 263 wb->n = wb->base; 264 memset(wb->n, 0, NETS_LEN*sizeof(*wb->n)); 265 266 /* install authentication if appropriate 267 */ 268 if (ap == 0) 269 return; 270 na = (struct netauth*)wb->n; 271 if (ap->type == RIP_AUTH_PW) { 272 na->a_family = RIP_AF_AUTH; 273 na->a_type = RIP_AUTH_PW; 274 memmove(na->au.au_pw, ap->key, sizeof(na->au.au_pw)); 275 wb->n++; 276 277 } else if (ap->type == RIP_AUTH_MD5) { 278 na->a_family = RIP_AF_AUTH; 279 na->a_type = RIP_AUTH_MD5; 280 na->au.a_md5.md5_keyid = ap->keyid; 281 na->au.a_md5.md5_auth_len = RIP_AUTH_PW_LEN; 282 na->au.a_md5.md5_seqno = clk.tv_sec; 283 wb->n++; 284 wb->lim--; /* make room for trailer */ 285 } 286 } 287 288 289 void 290 end_md5_auth(struct ws_buf *wb, 291 struct auth *ap) 292 { 293 struct netauth *na, *na2; 294 MD5_CTX md5_ctx; 295 296 297 na = (struct netauth*)wb->base; 298 na2 = (struct netauth*)wb->n; 299 na2->a_family = RIP_AF_AUTH; 300 na2->a_type = 1; 301 memmove(na2->au.au_pw, ap->key, sizeof(na2->au.au_pw)); 302 na->au.a_md5.md5_pkt_len = (char *)na2-(char *)(na+1); 303 MD5Init(&md5_ctx); 304 MD5Update(&md5_ctx, (u_char *)na, 305 (char *)(na2+1) - (char *)na); 306 MD5Final(na2->au.au_pw, &md5_ctx); 307 wb->n++; 308 } 309 310 311 /* Send the buffer 312 */ 313 static void 314 supply_write(struct ws_buf *wb) 315 { 316 /* Output multicast only if legal. 317 * If we would multcast and it would be illegal, then discard the 318 * packet. 319 */ 320 switch (wb->type) { 321 case NO_OUT_MULTICAST: 322 trace_pkt("skip multicast to %s because impossible", 323 naddr_ntoa(ws.to.sin_addr.s_addr)); 324 break; 325 case NO_OUT_RIPV2: 326 break; 327 default: 328 if (ws.a != 0 && ws.a->type == RIP_AUTH_MD5) 329 end_md5_auth(wb,ws.a); 330 if (output(wb->type, &ws.to, ws.ifp, wb->buf, 331 ((char *)wb->n - (char*)wb->buf)) < 0 332 && ws.ifp != 0) 333 if_sick(ws.ifp); 334 ws.npackets++; 335 break; 336 } 337 338 clr_ws_buf(wb,ws.a); 339 } 340 341 342 /* put an entry into the packet 343 */ 344 static void 345 supply_out(struct ag_info *ag) 346 { 347 int i; 348 naddr mask, v1_mask, dst_h, ddst_h = 0; 349 struct ws_buf *wb; 350 351 352 /* Skip this route if doing a flash update and it and the routes 353 * it aggregates have not changed recently. 354 */ 355 if (ag->ag_seqno < update_seqno 356 && (ws.state & WS_ST_FLASH)) 357 return; 358 359 dst_h = ag->ag_dst_h; 360 mask = ag->ag_mask; 361 v1_mask = ripv1_mask_host(htonl(dst_h), 362 (ws.state & WS_ST_TO_ON_NET) ? ws.ifp : 0); 363 i = 0; 364 365 /* If we are sending RIPv2 packets that cannot (or must not) be 366 * heard by RIPv1 listeners, do not worry about sub- or supernets. 367 * Subnets (from other networks) can only be sent via multicast. 368 * A pair of subnet routes might have been promoted so that they 369 * are legal to send by RIPv1. 370 * If RIPv1 is off, use the multicast buffer. 371 */ 372 if ((ws.state & WS_ST_RIP2_ALL) 373 || ((ag->ag_state & AGS_RIPV2) && v1_mask != mask)) { 374 /* use the RIPv2-only buffer */ 375 wb = &v2buf; 376 377 } else { 378 /* use the RIPv1-or-RIPv2 buffer */ 379 wb = &v12buf; 380 381 /* Convert supernet route into corresponding set of network 382 * routes for RIPv1, but leave non-contiguous netmasks 383 * to ag_check(). 384 */ 385 if (v1_mask > mask 386 && mask + (mask & -mask) == 0) { 387 ddst_h = v1_mask & -v1_mask; 388 i = (v1_mask & ~mask)/ddst_h; 389 390 if (i > ws.gen_limit) { 391 /* Punt if we would have to generate an 392 * unreasonable number of routes. 393 */ 394 if (TRACECONTENTS) 395 trace_misc("sending %s-->%s as 1" 396 " instead of %d routes", 397 addrname(htonl(dst_h), mask, 398 1), 399 naddr_ntoa(ws.to.sin_addr 400 .s_addr), 401 i+1); 402 i = 0; 403 404 } else { 405 mask = v1_mask; 406 ws.gen_limit -= i; 407 } 408 } 409 } 410 411 do { 412 wb->n->n_family = RIP_AF_INET; 413 wb->n->n_dst = htonl(dst_h); 414 /* If the route is from router-discovery or we are 415 * shutting down, admit only a bad metric. 416 */ 417 wb->n->n_metric = ((stopint || ag->ag_metric < 1) 418 ? HOPCNT_INFINITY 419 : ag->ag_metric); 420 HTONL(wb->n->n_metric); 421 /* Any non-zero bits in the supposedly unused RIPv1 fields 422 * cause the old `routed` to ignore the route. 423 * That means the mask and so forth cannot be sent 424 * in the hybrid RIPv1/RIPv2 mode. 425 */ 426 if (ws.state & WS_ST_RIP2_ALL) { 427 if (ag->ag_nhop != 0 428 && ((ws.state & WS_ST_QUERY) 429 || (ag->ag_nhop != ws.ifp->int_addr 430 && on_net(ag->ag_nhop, 431 ws.ifp->int_net, 432 ws.ifp->int_mask)))) 433 wb->n->n_nhop = ag->ag_nhop; 434 wb->n->n_mask = htonl(mask); 435 wb->n->n_tag = ag->ag_tag; 436 } 437 dst_h += ddst_h; 438 439 if (++wb->n >= wb->lim) 440 supply_write(wb); 441 } while (i-- != 0); 442 } 443 444 445 /* supply one route from the table 446 */ 447 /* ARGSUSED */ 448 static int 449 walk_supply(struct radix_node *rn, struct walkarg *argp) 450 { 451 #define RT ((struct rt_entry *)rn) 452 u_short ags; 453 char metric, pref; 454 naddr dst, nhop; 455 struct rt_spare *rts; 456 int i; 457 458 459 /* Do not advertise external remote interfaces or passive interfaces. 460 */ 461 if ((RT->rt_state & RS_IF) 462 && RT->rt_ifp != 0 463 && (RT->rt_ifp->int_if_flags & IS_PASSIVE) 464 && !(RT->rt_state & RS_MHOME)) 465 return 0; 466 467 /* If being quiet about our ability to forward, then 468 * do not say anything unless responding to a query, 469 * except about our main interface. 470 */ 471 if (!supplier && !(ws.state & WS_ST_QUERY) 472 && !(RT->rt_state & RS_MHOME)) 473 return 0; 474 475 dst = RT->rt_dst; 476 477 /* do not collide with the fake default route */ 478 if (dst == RIP_DEFAULT 479 && (ws.state & WS_ST_DEFAULT)) 480 return 0; 481 482 if (RT->rt_state & RS_NET_SYN) { 483 if (RT->rt_state & RS_NET_INT) { 484 /* Do not send manual synthetic network routes 485 * into the subnet. 486 */ 487 if (on_net(ws.to.sin_addr.s_addr, 488 ntohl(dst), RT->rt_mask)) 489 return 0; 490 491 } else { 492 /* Do not send automatic synthetic network routes 493 * if they are not needed because no RIPv1 listeners 494 * can hear them. 495 */ 496 if (ws.state & WS_ST_RIP2_ALL) 497 return 0; 498 499 /* Do not send automatic synthetic network routes to 500 * the real subnet. 501 */ 502 if (on_net(ws.to.sin_addr.s_addr, 503 ntohl(dst), RT->rt_mask)) 504 return 0; 505 } 506 nhop = 0; 507 508 } else { 509 /* Advertise the next hop if this is not a route for one 510 * of our interfaces and the next hop is on the same 511 * network as the target. 512 * The final determination is made by supply_out(). 513 */ 514 if (!(RT->rt_state & RS_IF) 515 && RT->rt_gate != myaddr 516 && RT->rt_gate != loopaddr) 517 nhop = RT->rt_gate; 518 else 519 nhop = 0; 520 } 521 522 metric = RT->rt_metric; 523 ags = 0; 524 525 if (RT->rt_state & RS_MHOME) { 526 /* retain host route of multi-homed servers */ 527 ; 528 529 } else if (RT_ISHOST(RT)) { 530 /* We should always suppress (into existing network routes) 531 * the host routes for the local end of our point-to-point 532 * links. 533 * If we are suppressing host routes in general, then do so. 534 * Avoid advertising host routes onto their own network, 535 * where they should be handled by proxy-ARP. 536 */ 537 if ((RT->rt_state & RS_LOCAL) 538 || ridhosts 539 || on_net(dst, ws.to_net, ws.to_mask)) 540 ags |= AGS_SUPPRESS; 541 542 /* Aggregate stray host routes into network routes if allowed. 543 * We cannot aggregate host routes into small network routes 544 * without confusing RIPv1 listeners into thinking the 545 * network routes are host routes. 546 */ 547 if ((ws.state & WS_ST_AG) 548 && !(ws.state & WS_ST_RIP2_ALL)) 549 ags |= AGS_AGGREGATE; 550 551 } else { 552 /* Always suppress network routes into other, existing 553 * network routes 554 */ 555 ags |= AGS_SUPPRESS; 556 557 /* Generate supernets if allowed. 558 * If we can be heard by RIPv1 systems, we will 559 * later convert back to ordinary nets. 560 * This unifies dealing with received supernets. 561 */ 562 if ((ws.state & WS_ST_AG) 563 && ((RT->rt_state & RS_SUBNET) 564 || (ws.state & WS_ST_SUPER_AG))) 565 ags |= AGS_AGGREGATE; 566 } 567 568 /* Do not send RIPv1 advertisements of subnets to other 569 * networks. If possible, multicast them by RIPv2. 570 */ 571 if ((RT->rt_state & RS_SUBNET) 572 && !(ws.state & WS_ST_RIP2_ALL) 573 && !on_net(dst, ws.to_std_net, ws.to_std_mask)) 574 ags |= AGS_RIPV2 | AGS_AGGREGATE; 575 576 577 /* Do not send a route back to where it came from, except in 578 * response to a query. This is "split-horizon". That means not 579 * advertising back to the same network and so via the same interface. 580 * 581 * We want to suppress routes that might have been fragmented 582 * from this route by a RIPv1 router and sent back to us, and so we 583 * cannot forget this route here. Let the split-horizon route 584 * suppress the fragmented routes and then itself be forgotten. 585 * 586 * Include the routes for both ends of point-to-point interfaces 587 * among those suppressed by split-horizon, since the other side 588 * should knows them as well as we do. 589 * 590 * Notice spare routes with the same metric that we are about to 591 * advertise, to split the horizon on redunant, inactive paths. 592 */ 593 if (ws.ifp != 0 594 && !(ws.state & WS_ST_QUERY) 595 && (ws.state & WS_ST_TO_ON_NET) 596 && (!(RT->rt_state & RS_IF) 597 || ws.ifp->int_if_flags & IFF_POINTOPOINT)) { 598 for (rts = RT->rt_spares, i = NUM_SPARES; i != 0; i--, rts++) { 599 if (rts->rts_metric > metric 600 || rts->rts_ifp != ws.ifp) 601 continue; 602 603 /* If we do not mark the route with AGS_SPLIT_HZ here, 604 * it will be poisoned-reverse, or advertised back 605 * toward its source with an infinite metric. 606 * If we have recently advertised the route with a 607 * better metric than we now have, then we should 608 * poison-reverse the route before suppressing it for 609 * split-horizon. 610 * 611 * In almost all cases, if there is no spare for the 612 * route then it is either old and dead or a brand 613 * new route. If it is brand new, there is no need 614 * for poison-reverse. If it is old and dead, it 615 * is already poisoned. 616 */ 617 if (RT->rt_poison_time < now_expire 618 || RT->rt_poison_metric >= metric 619 || RT->rt_spares[1].rts_gate == 0) { 620 ags |= AGS_SPLIT_HZ; 621 ags &= ~AGS_SUPPRESS; 622 } 623 metric = HOPCNT_INFINITY; 624 break; 625 } 626 } 627 628 /* Keep track of the best metric with which the 629 * route has been advertised recently. 630 */ 631 if (RT->rt_poison_metric >= metric 632 || RT->rt_poison_time < now_expire) { 633 RT->rt_poison_time = now.tv_sec; 634 RT->rt_poison_metric = metric; 635 } 636 637 /* Adjust the outgoing metric by the cost of the link. 638 * Avoid aggregation when a route is counting to infinity. 639 */ 640 pref = RT->rt_poison_metric + ws.metric; 641 metric += ws.metric; 642 643 /* Do not advertise stable routes that will be ignored, 644 * unless we are answering a query. 645 * If the route recently was advertised with a metric that 646 * would have been less than infinity through this interface, 647 * we need to continue to advertise it in order to poison it. 648 */ 649 if (metric >= HOPCNT_INFINITY) { 650 if (!(ws.state & WS_ST_QUERY) 651 && (pref >= HOPCNT_INFINITY 652 || RT->rt_poison_time < now_garbage)) 653 return 0; 654 655 metric = HOPCNT_INFINITY; 656 } 657 658 ag_check(dst, RT->rt_mask, 0, nhop, metric, pref, 659 RT->rt_seqno, RT->rt_tag, ags, supply_out); 660 return 0; 661 #undef RT 662 } 663 664 665 /* Supply dst with the contents of the routing tables. 666 * If this won't fit in one packet, chop it up into several. 667 */ 668 void 669 supply(struct sockaddr_in *dst, 670 struct interface *ifp, /* output interface */ 671 enum output_type type, 672 int flash, /* 1=flash update */ 673 int vers, /* RIP version */ 674 int passwd_ok) /* OK to include cleartext password */ 675 { 676 struct rt_entry *rt; 677 int def_metric; 678 679 680 ws.state = 0; 681 ws.gen_limit = 1024; 682 683 ws.to = *dst; 684 ws.to_std_mask = std_mask(ws.to.sin_addr.s_addr); 685 ws.to_std_net = ntohl(ws.to.sin_addr.s_addr) & ws.to_std_mask; 686 687 if (ifp != 0) { 688 ws.to_mask = ifp->int_mask; 689 ws.to_net = ifp->int_net; 690 if (on_net(ws.to.sin_addr.s_addr, ws.to_net, ws.to_mask)) 691 ws.state |= WS_ST_TO_ON_NET; 692 693 } else { 694 ws.to_mask = ripv1_mask_net(ws.to.sin_addr.s_addr, 0); 695 ws.to_net = ntohl(ws.to.sin_addr.s_addr) & ws.to_mask; 696 rt = rtfind(dst->sin_addr.s_addr); 697 if (rt) 698 ifp = rt->rt_ifp; 699 } 700 701 ws.npackets = 0; 702 if (flash) 703 ws.state |= WS_ST_FLASH; 704 705 if ((ws.ifp = ifp) == 0) { 706 ws.metric = 1; 707 } else { 708 /* Adjust the advertised metric by the outgoing interface 709 * metric. 710 */ 711 ws.metric = ifp->int_metric+1; 712 } 713 714 ripv12_buf.rip.rip_vers = vers; 715 716 switch (type) { 717 case OUT_MULTICAST: 718 if (ifp->int_if_flags & IFF_MULTICAST) 719 v2buf.type = OUT_MULTICAST; 720 else 721 v2buf.type = NO_OUT_MULTICAST; 722 v12buf.type = OUT_BROADCAST; 723 break; 724 725 case OUT_QUERY: 726 ws.state |= WS_ST_QUERY; 727 /* fall through */ 728 case OUT_BROADCAST: 729 case OUT_UNICAST: 730 v2buf.type = (vers == RIPv2) ? type : NO_OUT_RIPV2; 731 v12buf.type = type; 732 break; 733 734 case NO_OUT_MULTICAST: 735 case NO_OUT_RIPV2: 736 break; /* no output */ 737 } 738 739 if (vers == RIPv2) { 740 /* full RIPv2 only if cannot be heard by RIPv1 listeners */ 741 if (type != OUT_BROADCAST) 742 ws.state |= WS_ST_RIP2_ALL; 743 if ((ws.state & WS_ST_QUERY) 744 || !(ws.state & WS_ST_TO_ON_NET)) { 745 ws.state |= (WS_ST_AG | WS_ST_SUPER_AG); 746 } else if (ifp == 0 || !(ifp->int_state & IS_NO_AG)) { 747 ws.state |= WS_ST_AG; 748 if (type != OUT_BROADCAST 749 && (ifp == 0 750 || !(ifp->int_state & IS_NO_SUPER_AG))) 751 ws.state |= WS_ST_SUPER_AG; 752 } 753 } 754 755 ws.a = (vers == RIPv2) ? find_auth(ifp) : 0; 756 if (!passwd_ok && ws.a != 0 && ws.a->type == RIP_AUTH_PW) 757 ws.a = 0; 758 clr_ws_buf(&v12buf,ws.a); 759 clr_ws_buf(&v2buf,ws.a); 760 761 /* Fake a default route if asked and if there is not already 762 * a better, real default route. 763 */ 764 if (supplier && (def_metric = ifp->int_d_metric) != 0) { 765 if (0 == (rt = rtget(RIP_DEFAULT, 0)) 766 || rt->rt_metric+ws.metric >= def_metric) { 767 ws.state |= WS_ST_DEFAULT; 768 ag_check(0, 0, 0, 0, def_metric, def_metric, 769 0, 0, 0, supply_out); 770 } else { 771 def_metric = rt->rt_metric+ws.metric; 772 } 773 774 /* If both RIPv2 and the poor-man's router discovery 775 * kludge are on, arrange to advertise an extra 776 * default route via RIPv1. 777 */ 778 if ((ws.state & WS_ST_RIP2_ALL) 779 && (ifp->int_state & IS_PM_RDISC)) { 780 ripv12_buf.rip.rip_vers = RIPv1; 781 v12buf.n->n_family = RIP_AF_INET; 782 v12buf.n->n_dst = htonl(RIP_DEFAULT); 783 v12buf.n->n_metric = htonl(def_metric); 784 v12buf.n++; 785 } 786 } 787 788 (void)rn_walktree(rhead, walk_supply, 0); 789 ag_flush(0,0,supply_out); 790 791 /* Flush the packet buffers, provided they are not empty and 792 * do not contain only the password. 793 */ 794 if (v12buf.n != v12buf.base 795 && (v12buf.n > v12buf.base+1 796 || v12buf.base->n_family != RIP_AF_AUTH)) 797 supply_write(&v12buf); 798 if (v2buf.n != v2buf.base 799 && (v2buf.n > v2buf.base+1 800 || v2buf.base->n_family != RIP_AF_AUTH)) 801 supply_write(&v2buf); 802 803 /* If we sent nothing and this is an answer to a query, send 804 * an empty buffer. 805 */ 806 if (ws.npackets == 0 807 && (ws.state & WS_ST_QUERY)) 808 supply_write(&v12buf); 809 } 810 811 812 /* send all of the routing table or just do a flash update 813 */ 814 void 815 rip_bcast(int flash) 816 { 817 #ifdef _HAVE_SIN_LEN 818 static struct sockaddr_in dst = {sizeof(dst), AF_INET}; 819 #else 820 static struct sockaddr_in dst = {AF_INET}; 821 #endif 822 struct interface *ifp; 823 enum output_type type; 824 int vers; 825 struct timeval rtime; 826 827 828 need_flash = 0; 829 intvl_random(&rtime, MIN_WAITTIME, MAX_WAITTIME); 830 no_flash = rtime; 831 timevaladd(&no_flash, &now); 832 833 if (rip_sock < 0) 834 return; 835 836 trace_act("send %s and inhibit dynamic updates for %.3f sec", 837 flash ? "dynamic update" : "all routes", 838 rtime.tv_sec + ((float)rtime.tv_usec)/1000000.0); 839 840 for (ifp = ifnet; ifp != 0; ifp = ifp->int_next) { 841 /* Skip interfaces not doing RIP. 842 * Do try broken interfaces to see if they have healed. 843 */ 844 if (IS_RIP_OUT_OFF(ifp->int_state)) 845 continue; 846 847 /* skip turned off interfaces */ 848 if (!iff_up(ifp->int_if_flags)) 849 continue; 850 851 vers = (ifp->int_state & IS_NO_RIPV1_OUT) ? RIPv2 : RIPv1; 852 853 if (ifp->int_if_flags & IFF_BROADCAST) { 854 /* ordinary, hardware interface */ 855 dst.sin_addr.s_addr = ifp->int_brdaddr; 856 857 if (vers == RIPv2 858 && !(ifp->int_state & IS_NO_RIP_MCAST)) { 859 type = OUT_MULTICAST; 860 } else { 861 type = OUT_BROADCAST; 862 } 863 864 } else if (ifp->int_if_flags & IFF_POINTOPOINT) { 865 /* point-to-point hardware interface */ 866 dst.sin_addr.s_addr = ifp->int_dstaddr; 867 type = OUT_UNICAST; 868 869 } else if (ifp->int_state & IS_REMOTE) { 870 /* remote interface */ 871 dst.sin_addr.s_addr = ifp->int_addr; 872 type = OUT_UNICAST; 873 874 } else { 875 /* ATM, HIPPI, etc. */ 876 continue; 877 } 878 879 supply(&dst, ifp, type, flash, vers, 1); 880 } 881 882 update_seqno++; /* all routes are up to date */ 883 } 884 885 886 /* Ask for routes 887 * Do it only once to an interface, and not even after the interface 888 * was broken and recovered. 889 */ 890 void 891 rip_query(void) 892 { 893 #ifdef _HAVE_SIN_LEN 894 static struct sockaddr_in dst = {sizeof(dst), AF_INET}; 895 #else 896 static struct sockaddr_in dst = {AF_INET}; 897 #endif 898 struct interface *ifp; 899 struct rip buf; 900 enum output_type type; 901 902 903 if (rip_sock < 0) 904 return; 905 906 memset(&buf, 0, sizeof(buf)); 907 908 for (ifp = ifnet; ifp; ifp = ifp->int_next) { 909 /* Skip interfaces those already queried. 910 * Do not ask via interfaces through which we don't 911 * accept input. Do not ask via interfaces that cannot 912 * send RIP packets. 913 * Do try broken interfaces to see if they have healed. 914 */ 915 if (IS_RIP_IN_OFF(ifp->int_state) 916 || ifp->int_query_time != NEVER) 917 continue; 918 919 /* skip turned off interfaces */ 920 if (!iff_up(ifp->int_if_flags)) 921 continue; 922 923 buf.rip_vers = (ifp->int_state&IS_NO_RIPV1_OUT) ? RIPv2:RIPv1; 924 buf.rip_cmd = RIPCMD_REQUEST; 925 buf.rip_nets[0].n_family = RIP_AF_UNSPEC; 926 buf.rip_nets[0].n_metric = htonl(HOPCNT_INFINITY); 927 928 /* Send a RIPv1 query only if allowed and if we will 929 * listen to RIPv1 routers. 930 */ 931 if ((ifp->int_state & IS_NO_RIPV1_OUT) 932 || (ifp->int_state & IS_NO_RIPV1_IN)) { 933 buf.rip_vers = RIPv2; 934 } else { 935 buf.rip_vers = RIPv1; 936 } 937 938 if (ifp->int_if_flags & IFF_BROADCAST) { 939 /* ordinary, hardware interface */ 940 dst.sin_addr.s_addr = ifp->int_brdaddr; 941 942 /* Broadcast RIPv1 queries and RIPv2 queries 943 * when the hardware cannot multicast. 944 */ 945 if (buf.rip_vers == RIPv2 946 && (ifp->int_if_flags & IFF_MULTICAST) 947 && !(ifp->int_state & IS_NO_RIP_MCAST)) { 948 type = OUT_MULTICAST; 949 } else { 950 type = OUT_BROADCAST; 951 } 952 953 } else if (ifp->int_if_flags & IFF_POINTOPOINT) { 954 /* point-to-point hardware interface */ 955 dst.sin_addr.s_addr = ifp->int_dstaddr; 956 type = OUT_UNICAST; 957 958 } else if (ifp->int_state & IS_REMOTE) { 959 /* remote interface */ 960 dst.sin_addr.s_addr = ifp->int_addr; 961 type = OUT_UNICAST; 962 963 } else { 964 /* ATM, HIPPI, etc. */ 965 continue; 966 } 967 968 ifp->int_query_time = now.tv_sec+SUPPLY_INTERVAL; 969 if (output(type, &dst, ifp, &buf, sizeof(buf)) < 0) 970 if_sick(ifp); 971 } 972 } 973
Indexes created Tue Sep 30 17:09:57 GMT 2025