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sbin/hammer: Make hammer_parsedevs() take open(2) flag
[dragonfly.git] / sbin / routed / output.c
blobcc5248ef771260c8a251aa80dd055f3c654e4d23
1 /*
2 * Copyright (c) 1983, 1988, 1993
3 * The Regents of the University of California. All rights reserved.
4 *
5 * Redistribution and use in source and binary forms, with or without
6 * modification, are permitted provided that the following conditions
7 * are met:
8 * 1. Redistributions of source code must retain the above copyright
9 * notice, this list of conditions and the following disclaimer.
10 * 2. Redistributions in binary form must reproduce the above copyright
11 * notice, this list of conditions and the following disclaimer in the
12 * documentation and/or other materials provided with the distribution.
13 * 3. Neither the name of the University nor the names of its contributors
14 * may be used to endorse or promote products derived from this software
15 * without specific prior written permission.
16 *
17 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
18 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
19 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
20 * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
21 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
22 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
23 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
24 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
25 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
26 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
27 * SUCH DAMAGE.
28 *
29 * $FreeBSD: src/sbin/routed/output.c,v 1.5.2.1 2000/08/14 17:00:03 sheldonh Exp $
30 */
31
32 #include "defs.h"
33
34 #if !defined(__NetBSD__)
35 static char sccsid[] __attribute__((unused)) = "@(#)output.c 8.1 (Berkeley) 6/5/93";
36 #elif defined(__NetBSD__)
37 __RCSID("$NetBSD$");
38 #endif
39
40
41 u_int update_seqno;
42
43
44 /* walk the tree of routes with this for output
45 */
46 struct {
47 struct sockaddr_in to;
48 naddr to_mask;
49 naddr to_net;
50 naddr to_std_mask;
51 naddr to_std_net;
52 struct interface *ifp; /* usually output interface */
53 struct auth *a;
54 char metric; /* adjust metrics by interface */
55 int npackets;
56 int gen_limit;
57 u_int state;
58 #define WS_ST_FLASH 0x001 /* send only changed routes */
59 #define WS_ST_RIP2_ALL 0x002 /* send full featured RIPv2 */
60 #define WS_ST_AG 0x004 /* ok to aggregate subnets */
61 #define WS_ST_SUPER_AG 0x008 /* ok to aggregate networks */
62 #define WS_ST_QUERY 0x010 /* responding to a query */
63 #define WS_ST_TO_ON_NET 0x020 /* sending onto one of our nets */
64 #define WS_ST_DEFAULT 0x040 /* faking a default */
65 } ws;
66
67 /* A buffer for what can be heard by both RIPv1 and RIPv2 listeners */
68 struct ws_buf v12buf;
69 union pkt_buf ripv12_buf;
70
71 /* Another for only RIPv2 listeners */
72 struct ws_buf v2buf;
73 union pkt_buf rip_v2_buf;
74
75
76
77 void
78 bufinit(void)
79 {
80 ripv12_buf.rip.rip_cmd = RIPCMD_RESPONSE;
81 v12buf.buf = &ripv12_buf.rip;
82 v12buf.base = &v12buf.buf->rip_nets[0];
83
84 rip_v2_buf.rip.rip_cmd = RIPCMD_RESPONSE;
85 rip_v2_buf.rip.rip_vers = RIPv2;
86 v2buf.buf = &rip_v2_buf.rip;
87 v2buf.base = &v2buf.buf->rip_nets[0];
88 }
89
90
91 /* Send the contents of the global buffer via the non-multicast socket
92 */
93 int /* <0 on failure */
94 output(enum output_type type,
95 struct sockaddr_in *dst, /* send to here */
96 struct interface *ifp,
97 struct rip *buf,
98 int size) /* this many bytes */
99 {
100 struct sockaddr_in in;
101 int flags;
102 const char *msg;
103 int res;
104 naddr tgt_mcast;
105 int soc;
106 int serrno;
107
108 in = *dst;
109 if (in.sin_port == 0)
110 in.sin_port = htons(RIP_PORT);
111 #ifdef _HAVE_SIN_LEN
112 if (in.sin_len == 0)
113 in.sin_len = sizeof(in);
114 #endif
115
116 soc = rip_sock;
117 flags = 0;
118
119 switch (type) {
120 case OUT_QUERY:
121 msg = "Answer Query";
122 if (soc < 0)
123 soc = ifp->int_rip_sock;
124 break;
125 case OUT_UNICAST:
126 msg = "Send";
127 if (soc < 0)
128 soc = ifp->int_rip_sock;
129 flags = MSG_DONTROUTE;
130 break;
131 case OUT_BROADCAST:
132 if (ifp->int_if_flags & IFF_POINTOPOINT) {
133 msg = "Send";
134 } else {
135 msg = "Send bcast";
136 }
137 flags = MSG_DONTROUTE;
138 break;
139 case OUT_MULTICAST:
140 if (ifp->int_if_flags & IFF_POINTOPOINT) {
141 msg = "Send pt-to-pt";
142 } else if (ifp->int_state & IS_DUP) {
143 trace_act("abort multicast output via %s"
144 " with duplicate address",
145 ifp->int_name);
146 return 0;
147 } else {
148 msg = "Send mcast";
149 if (rip_sock_mcast != ifp) {
150 #ifdef MCAST_PPP_BUG
151 /* Do not specify the primary interface
152 * explicitly if we have the multicast
153 * point-to-point kernel bug, since the
154 * kernel will do the wrong thing if the
155 * local address of a point-to-point link
156 * is the same as the address of an ordinary
157 * interface.
158 */
159 if (ifp->int_addr == myaddr) {
160 tgt_mcast = 0;
161 } else
162 #endif
163 tgt_mcast = ifp->int_addr;
164 if (0 > setsockopt(rip_sock,
165 IPPROTO_IP, IP_MULTICAST_IF,
166 &tgt_mcast,
167 sizeof(tgt_mcast))) {
168 serrno = errno;
169 LOGERR("setsockopt(rip_sock,"
170 "IP_MULTICAST_IF)");
171 errno = serrno;
172 ifp = NULL;
173 return -1;
174 }
175 rip_sock_mcast = ifp;
176 }
177 in.sin_addr.s_addr = htonl(INADDR_RIP_GROUP);
178 }
179 break;
180
181 case NO_OUT_MULTICAST:
182 case NO_OUT_RIPV2:
183 default:
184 #ifdef DEBUG
185 abort();
186 #endif
187 return -1;
188 }
189
190 trace_rip(msg, "to", &in, ifp, buf, size);
191
192 res = sendto(soc, buf, size, flags,
193 (struct sockaddr *)&in, sizeof(in));
194 if (res < 0
195 && (ifp == NULL || !(ifp->int_state & IS_BROKE))) {
196 serrno = errno;
197 msglog("%s sendto(%s%s%s.%d): %s", msg,
198 ifp != NULL ? ifp->int_name : "",
199 ifp != NULL ? ", " : "",
200 inet_ntoa(in.sin_addr),
201 ntohs(in.sin_port),
202 strerror(errno));
203 errno = serrno;
204 }
205
206 return res;
207 }
208
209
210 /* Find the first key for a packet to send.
211 * Try for a key that is eligible and has not expired, but settle for
212 * the last key if they have all expired.
213 * If no key is ready yet, give up.
214 */
215 struct auth *
216 find_auth(struct interface *ifp)
217 {
218 struct auth *ap, *res;
219 int i;
220
221
222 if (ifp == NULL)
223 return 0;
224
225 res = NULL;
226 ap = ifp->int_auth;
227 for (i = 0; i < MAX_AUTH_KEYS; i++, ap++) {
228 /* stop looking after the last key */
229 if (ap->type == RIP_AUTH_NONE)
230 break;
231
232 /* ignore keys that are not ready yet */
233 if ((u_long)ap->start > (u_long)clk.tv_sec)
234 continue;
235
236 if ((u_long)ap->end < (u_long)clk.tv_sec) {
237 /* note best expired password as a fall-back */
238 if (res == NULL || (u_long)ap->end > (u_long)res->end)
239 res = ap;
240 continue;
241 }
242
243 /* note key with the best future */
244 if (res == NULL || (u_long)res->end < (u_long)ap->end)
245 res = ap;
246 }
247 return res;
248 }
249
250
251 void
252 clr_ws_buf(struct ws_buf *wb,
253 struct auth *ap)
254 {
255 struct netauth *na;
256
257 wb->lim = wb->base + NETS_LEN;
258 wb->n = wb->base;
259 memset(wb->n, 0, NETS_LEN*sizeof(*wb->n));
260
261 /* (start to) install authentication if appropriate
262 */
263 if (ap == NULL)
264 return;
265
266 na = (struct netauth*)wb->n;
267 if (ap->type == RIP_AUTH_PW) {
268 na->a_family = RIP_AF_AUTH;
269 na->a_type = RIP_AUTH_PW;
270 memcpy(na->au.au_pw, ap->key, sizeof(na->au.au_pw));
271 wb->n++;
272
273 } else if (ap->type == RIP_AUTH_MD5) {
274 na->a_family = RIP_AF_AUTH;
275 na->a_type = RIP_AUTH_MD5;
276 na->au.a_md5.md5_keyid = ap->keyid;
277 na->au.a_md5.md5_auth_len = RIP_AUTH_MD5_LEN;
278 na->au.a_md5.md5_seqno = htonl(clk.tv_sec);
279 wb->n++;
280 wb->lim--; /* make room for trailer */
281 }
282 }
283
284
285 void
286 end_md5_auth(struct ws_buf *wb,
287 struct auth *ap)
288 {
289 struct netauth *na, *na2;
290 MD5_CTX md5_ctx;
291 int len;
292
293
294 na = (struct netauth*)wb->base;
295 na2 = (struct netauth*)wb->n;
296 len = (char *)na2-(char *)wb->buf;
297 na2->a_family = RIP_AF_AUTH;
298 na2->a_type = htons(1);
299 na->au.a_md5.md5_pkt_len = htons(len);
300 MD5Init(&md5_ctx);
301 MD5Update(&md5_ctx, (u_char *)wb->buf, len);
302 MD5Update(&md5_ctx, ap->key, RIP_AUTH_MD5_LEN);
303 MD5Final(na2->au.au_pw, &md5_ctx);
304 wb->n++;
305 }
306
307
308 /* Send the buffer
309 */
310 static void
311 supply_write(struct ws_buf *wb)
312 {
313 /* Output multicast only if legal.
314 * If we would multicast and it would be illegal, then discard the
315 * packet.
316 */
317 switch (wb->type) {
318 case NO_OUT_MULTICAST:
319 trace_pkt("skip multicast to %s because impossible",
320 naddr_ntoa(ws.to.sin_addr.s_addr));
321 break;
322 case NO_OUT_RIPV2:
323 break;
324 default:
325 if (ws.a != NULL && ws.a->type == RIP_AUTH_MD5)
326 end_md5_auth(wb,ws.a);
327 if (output(wb->type, &ws.to, ws.ifp, wb->buf,
328 ((char *)wb->n - (char*)wb->buf)) < 0
329 && ws.ifp != NULL)
330 if_sick(ws.ifp);
331 ws.npackets++;
332 break;
333 }
334
335 clr_ws_buf(wb,ws.a);
336 }
337
338
339 /* put an entry into the packet
340 */
341 static void
342 supply_out(struct ag_info *ag)
343 {
344 int i;
345 naddr mask, v1_mask, dst_h, ddst_h = 0;
346 struct ws_buf *wb;
347
348
349 /* Skip this route if doing a flash update and it and the routes
350 * it aggregates have not changed recently.
351 */
352 if (ag->ag_seqno < update_seqno
353 && (ws.state & WS_ST_FLASH))
354 return;
355
356 dst_h = ag->ag_dst_h;
357 mask = ag->ag_mask;
358 v1_mask = ripv1_mask_host(htonl(dst_h),
359 (ws.state & WS_ST_TO_ON_NET) ? ws.ifp : 0);
360 i = 0;
361
362 /* If we are sending RIPv2 packets that cannot (or must not) be
363 * heard by RIPv1 listeners, do not worry about sub- or supernets.
364 * Subnets (from other networks) can only be sent via multicast.
365 * A pair of subnet routes might have been promoted so that they
366 * are legal to send by RIPv1.
367 * If RIPv1 is off, use the multicast buffer.
368 */
369 if ((ws.state & WS_ST_RIP2_ALL)
370 || ((ag->ag_state & AGS_RIPV2) && v1_mask != mask)) {
371 /* use the RIPv2-only buffer */
372 wb = &v2buf;
373
374 } else {
375 /* use the RIPv1-or-RIPv2 buffer */
376 wb = &v12buf;
377
378 /* Convert supernet route into corresponding set of network
379 * routes for RIPv1, but leave non-contiguous netmasks
380 * to ag_check().
381 */
382 if (v1_mask > mask
383 && mask + (mask & -mask) == 0) {
384 ddst_h = v1_mask & -v1_mask;
385 i = (v1_mask & ~mask)/ddst_h;
386
387 if (i > ws.gen_limit) {
388 /* Punt if we would have to generate an
389 * unreasonable number of routes.
390 */
391 if (TRACECONTENTS)
392 trace_misc("sending %s-->%s as 1"
393 " instead of %d routes",
394 addrname(htonl(dst_h), mask,
395 1),
396 naddr_ntoa(ws.to.sin_addr
397 .s_addr),
398 i+1);
399 i = 0;
400
401 } else {
402 mask = v1_mask;
403 ws.gen_limit -= i;
404 }
405 }
406 }
407
408 do {
409 wb->n->n_family = RIP_AF_INET;
410 wb->n->n_dst = htonl(dst_h);
411 /* If the route is from router-discovery or we are
412 * shutting down, admit only a bad metric.
413 */
414 wb->n->n_metric = ((stopint || ag->ag_metric < 1)
415 ? HOPCNT_INFINITY
416 : ag->ag_metric);
417 wb->n->n_metric = htonl(wb->n->n_metric);
418 /* Any non-zero bits in the supposedly unused RIPv1 fields
419 * cause the old `routed` to ignore the route.
420 * That means the mask and so forth cannot be sent
421 * in the hybrid RIPv1/RIPv2 mode.
422 */
423 if (ws.state & WS_ST_RIP2_ALL) {
424 if (ag->ag_nhop != 0
425 && ((ws.state & WS_ST_QUERY)
426 || (ag->ag_nhop != ws.ifp->int_addr
427 && on_net(ag->ag_nhop,
428 ws.ifp->int_net,
429 ws.ifp->int_mask))))
430 wb->n->n_nhop = ag->ag_nhop;
431 wb->n->n_mask = htonl(mask);
432 wb->n->n_tag = ag->ag_tag;
433 }
434 dst_h += ddst_h;
435
436 if (++wb->n >= wb->lim)
437 supply_write(wb);
438 } while (i-- != 0);
439 }
440
441
442 /* supply one route from the table
443 */
444 /* ARGSUSED */
445 static int
446 walk_supply(struct radix_node *rn,
447 struct walkarg *argp UNUSED)
448 {
449 #define RT ((struct rt_entry *)rn)
450 u_short ags;
451 char metric, pref;
452 naddr dst, nhop;
453 struct rt_spare *rts;
454 int i;
455
456
457 /* Do not advertise external remote interfaces or passive interfaces.
458 */
459 if ((RT->rt_state & RS_IF)
460 && RT->rt_ifp != 0
461 && (RT->rt_ifp->int_state & IS_PASSIVE)
462 && !(RT->rt_state & RS_MHOME))
463 return 0;
464
465 /* If being quiet about our ability to forward, then
466 * do not say anything unless responding to a query,
467 * except about our main interface.
468 */
469 if (!supplier && !(ws.state & WS_ST_QUERY)
470 && !(RT->rt_state & RS_MHOME))
471 return 0;
472
473 dst = RT->rt_dst;
474
475 /* do not collide with the fake default route */
476 if (dst == RIP_DEFAULT
477 && (ws.state & WS_ST_DEFAULT))
478 return 0;
479
480 if (RT->rt_state & RS_NET_SYN) {
481 if (RT->rt_state & RS_NET_INT) {
482 /* Do not send manual synthetic network routes
483 * into the subnet.
484 */
485 if (on_net(ws.to.sin_addr.s_addr,
486 ntohl(dst), RT->rt_mask))
487 return 0;
488
489 } else {
490 /* Do not send automatic synthetic network routes
491 * if they are not needed because no RIPv1 listeners
492 * can hear them.
493 */
494 if (ws.state & WS_ST_RIP2_ALL)
495 return 0;
496
497 /* Do not send automatic synthetic network routes to
498 * the real subnet.
499 */
500 if (on_net(ws.to.sin_addr.s_addr,
501 ntohl(dst), RT->rt_mask))
502 return 0;
503 }
504 nhop = 0;
505
506 } else {
507 /* Advertise the next hop if this is not a route for one
508 * of our interfaces and the next hop is on the same
509 * network as the target.
510 * The final determination is made by supply_out().
511 */
512 if (!(RT->rt_state & RS_IF)
513 && RT->rt_gate != myaddr
514 && RT->rt_gate != loopaddr)
515 nhop = RT->rt_gate;
516 else
517 nhop = 0;
518 }
519
520 metric = RT->rt_metric;
521 ags = 0;
522
523 if (RT->rt_state & RS_MHOME) {
524 /* retain host route of multi-homed servers */
525 ;
526
527 } else if (RT_ISHOST(RT)) {
528 /* We should always suppress (into existing network routes)
529 * the host routes for the local end of our point-to-point
530 * links.
531 * If we are suppressing host routes in general, then do so.
532 * Avoid advertising host routes onto their own network,
533 * where they should be handled by proxy-ARP.
534 */
535 if ((RT->rt_state & RS_LOCAL)
536 || ridhosts
537 || on_net(dst, ws.to_net, ws.to_mask))
538 ags |= AGS_SUPPRESS;
539
540 /* Aggregate stray host routes into network routes if allowed.
541 * We cannot aggregate host routes into small network routes
542 * without confusing RIPv1 listeners into thinking the
543 * network routes are host routes.
544 */
545 if ((ws.state & WS_ST_AG)
546 && !(ws.state & WS_ST_RIP2_ALL))
547 ags |= AGS_AGGREGATE;
548
549 } else {
550 /* Always suppress network routes into other, existing
551 * network routes
552 */
553 ags |= AGS_SUPPRESS;
554
555 /* Generate supernets if allowed.
556 * If we can be heard by RIPv1 systems, we will
557 * later convert back to ordinary nets.
558 * This unifies dealing with received supernets.
559 */
560 if ((ws.state & WS_ST_AG)
561 && ((RT->rt_state & RS_SUBNET)
562 || (ws.state & WS_ST_SUPER_AG)))
563 ags |= AGS_AGGREGATE;
564 }
565
566 /* Do not send RIPv1 advertisements of subnets to other
567 * networks. If possible, multicast them by RIPv2.
568 */
569 if ((RT->rt_state & RS_SUBNET)
570 && !(ws.state & WS_ST_RIP2_ALL)
571 && !on_net(dst, ws.to_std_net, ws.to_std_mask))
572 ags |= AGS_RIPV2 | AGS_AGGREGATE;
573
574
575 /* Do not send a route back to where it came from, except in
576 * response to a query. This is "split-horizon". That means not
577 * advertising back to the same network and so via the same interface.
578 *
579 * We want to suppress routes that might have been fragmented
580 * from this route by a RIPv1 router and sent back to us, and so we
581 * cannot forget this route here. Let the split-horizon route
582 * suppress the fragmented routes and then itself be forgotten.
583 *
584 * Include the routes for both ends of point-to-point interfaces
585 * among those suppressed by split-horizon, since the other side
586 * should knows them as well as we do.
587 *
588 * Notice spare routes with the same metric that we are about to
589 * advertise, to split the horizon on redundant, inactive paths.
590 */
591 if (ws.ifp != 0
592 && !(ws.state & WS_ST_QUERY)
593 && (ws.state & WS_ST_TO_ON_NET)
594 && (!(RT->rt_state & RS_IF)
595 || ws.ifp->int_if_flags & IFF_POINTOPOINT)) {
596 for (rts = RT->rt_spares, i = NUM_SPARES; i != 0; i--, rts++) {
597 if (rts->rts_metric > metric
598 || rts->rts_ifp != ws.ifp)
599 continue;
600
601 /* If we do not mark the route with AGS_SPLIT_HZ here,
602 * it will be poisoned-reverse, or advertised back
603 * toward its source with an infinite metric.
604 * If we have recently advertised the route with a
605 * better metric than we now have, then we should
606 * poison-reverse the route before suppressing it for
607 * split-horizon.
608 *
609 * In almost all cases, if there is no spare for the
610 * route then it is either old and dead or a brand
611 * new route. If it is brand new, there is no need
612 * for poison-reverse. If it is old and dead, it
613 * is already poisoned.
614 */
615 if (RT->rt_poison_time < now_expire
616 || RT->rt_poison_metric >= metric
617 || RT->rt_spares[1].rts_gate == 0) {
618 ags |= AGS_SPLIT_HZ;
619 ags &= ~AGS_SUPPRESS;
620 }
621 metric = HOPCNT_INFINITY;
622 break;
623 }
624 }
625
626 /* Keep track of the best metric with which the
627 * route has been advertised recently.
628 */
629 if (RT->rt_poison_metric >= metric
630 || RT->rt_poison_time < now_expire) {
631 RT->rt_poison_time = now.tv_sec;
632 RT->rt_poison_metric = metric;
633 }
634
635 /* Adjust the outgoing metric by the cost of the link.
636 * Avoid aggregation when a route is counting to infinity.
637 */
638 pref = RT->rt_poison_metric + ws.metric;
639 metric += ws.metric;
640
641 /* Do not advertise stable routes that will be ignored,
642 * unless we are answering a query.
643 * If the route recently was advertised with a metric that
644 * would have been less than infinity through this interface,
645 * we need to continue to advertise it in order to poison it.
646 */
647 if (metric >= HOPCNT_INFINITY) {
648 if (!(ws.state & WS_ST_QUERY)
649 && (pref >= HOPCNT_INFINITY
650 || RT->rt_poison_time < now_garbage))
651 return 0;
652
653 metric = HOPCNT_INFINITY;
654 }
655
656 ag_check(dst, RT->rt_mask, 0, nhop, metric, pref,
657 RT->rt_seqno, RT->rt_tag, ags, supply_out);
658 return 0;
659 #undef RT
660 }
661
662
663 /* Supply dst with the contents of the routing tables.
664 * If this won't fit in one packet, chop it up into several.
665 */
666 void
667 supply(struct sockaddr_in *dst,
668 struct interface *ifp, /* output interface */
669 enum output_type type,
670 int flash, /* 1=flash update */
671 int vers, /* RIP version */
672 int passwd_ok) /* OK to include cleartext password */
673 {
674 struct rt_entry *rt;
675 int def_metric;
676
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;
710 }
711
712 ripv12_buf.rip.rip_vers = vers;
713
714 switch (type) {
715 case OUT_MULTICAST:
716 if (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 /* fall through */
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 && (def_metric = ifp->int_d_metric) != 0) {
763 if (NULL == (rt = rtget(RIP_DEFAULT, 0))
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 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 */
812 void
813 rip_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 for (ifp = ifnet; ifp != NULL; ifp = ifp->int_next) {
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 type = OUT_UNICAST;
866
867 } else if (ifp->int_state & IS_REMOTE) {
868 /* remote interface */
869 dst.sin_addr.s_addr = ifp->int_addr;
870 type = OUT_UNICAST;
871
872 } else {
873 /* ATM, HIPPI, etc. */
874 continue;
875 }
876
877 supply(&dst, ifp, type, flash, vers, 1);
878 }
879
880 update_seqno++; /* all routes are up to date */
881 }
882
883
884 /* Ask for routes
885 * Do it only once to an interface, and not even after the interface
886 * was broken and recovered.
887 */
888 void
889 rip_query(void)
890 {
891 #ifdef _HAVE_SIN_LEN
892 static struct sockaddr_in dst = {sizeof(dst), AF_INET, 0, {0}, {0}};
893 #else
894 static struct sockaddr_in dst = {AF_INET};
895 #endif
896 struct interface *ifp;
897 struct rip buf;
898 enum output_type type;
899
900
901 if (rip_sock < 0)
902 return;
903
904 memset(&buf, 0, sizeof(buf));
905
906 for (ifp = ifnet; ifp; ifp = ifp->int_next) {
907 /* Skip interfaces those already queried.
908 * Do not ask via interfaces through which we don't
909 * accept input. Do not ask via interfaces that cannot
910 * send RIP packets.
911 * Do try broken interfaces to see if they have healed.
912 */
913 if (IS_RIP_IN_OFF(ifp->int_state)
914 || ifp->int_query_time != NEVER)
915 continue;
916
917 /* skip turned off interfaces */
918 if (!iff_up(ifp->int_if_flags))
919 continue;
920
921 buf.rip_vers = (ifp->int_state&IS_NO_RIPV1_OUT) ? RIPv2:RIPv1;
922 buf.rip_cmd = RIPCMD_REQUEST;
923 buf.rip_nets[0].n_family = RIP_AF_UNSPEC;
924 buf.rip_nets[0].n_metric = htonl(HOPCNT_INFINITY);
925
926 /* Send a RIPv1 query only if allowed and if we will
927 * listen to RIPv1 routers.
928 */
929 if ((ifp->int_state & IS_NO_RIPV1_OUT)
930 || (ifp->int_state & IS_NO_RIPV1_IN)) {
931 buf.rip_vers = RIPv2;
932 } else {
933 buf.rip_vers = RIPv1;
934 }
935
936 if (ifp->int_if_flags & IFF_BROADCAST) {
937 /* ordinary, hardware interface */
938 dst.sin_addr.s_addr = ifp->int_brdaddr;
939
940 /* Broadcast RIPv1 queries and RIPv2 queries
941 * when the hardware cannot multicast.
942 */
943 if (buf.rip_vers == RIPv2
944 && (ifp->int_if_flags & IFF_MULTICAST)
945 && !(ifp->int_state & IS_NO_RIP_MCAST)) {
946 type = OUT_MULTICAST;
947 } else {
948 type = OUT_BROADCAST;
949 }
950
951 } else if (ifp->int_if_flags & IFF_POINTOPOINT) {
952 /* point-to-point hardware interface */
953 dst.sin_addr.s_addr = ifp->int_dstaddr;
954 type = OUT_UNICAST;
955
956 } else if (ifp->int_state & IS_REMOTE) {
957 /* remote interface */
958 dst.sin_addr.s_addr = ifp->int_addr;
959 type = OUT_UNICAST;
960
961 } else {
962 /* ATM, HIPPI, etc. */
963 continue;
964 }
965
966 ifp->int_query_time = now.tv_sec+SUPPLY_INTERVAL;
967 if (output(type, &dst, ifp, &buf, sizeof(buf)) < 0)
968 if_sick(ifp);
969 }
970 }
DragonFly BSD