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Add another Qualcomm device ID.
[dragonfly/netmp.git] / sbin / routed / output.c
blob43cc1845bdd5b07e111e46ec0bb9816856453a1f
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. All advertising materials mentioning features or use of this software
14 * must display the following acknowledgment:
15 * This product includes software developed by the University of
16 * California, Berkeley and its contributors.
17 * 4. Neither the name of the University nor the names of its contributors
18 * may be used to endorse or promote products derived from this software
19 * without specific prior written permission.
20 *
21 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
22 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
23 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
24 * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
25 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
26 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
27 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
28 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
29 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
30 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
31 * SUCH DAMAGE.
32 *
33 * $FreeBSD: src/sbin/routed/output.c,v 1.5.2.1 2000/08/14 17:00:03 sheldonh Exp $
34 * $DragonFly: src/sbin/routed/output.c,v 1.5 2005/03/16 21:21:34 cpressey Exp $
35 */
36
37 #include "defs.h"
38
39 #if !defined(sgi) && !defined(__NetBSD__)
40 static char sccsid[] __attribute__((unused)) = "@(#)output.c 8.1 (Berkeley) 6/5/93";
41 #elif defined(__NetBSD__)
42 __RCSID("$NetBSD$");
43 #endif
44 #ident "$FreeBSD: src/sbin/routed/output.c,v 1.5.2.1 2000/08/14 17:00:03 sheldonh Exp $"
45
46
47 u_int update_seqno;
48
49
50 /* walk the tree of routes with this for output
51 */
52 struct {
53 struct sockaddr_in to;
54 naddr to_mask;
55 naddr to_net;
56 naddr to_std_mask;
57 naddr to_std_net;
58 struct interface *ifp; /* usually output interface */
59 struct auth *a;
60 char metric; /* adjust metrics by interface */
61 int npackets;
62 int gen_limit;
63 u_int state;
64 #define WS_ST_FLASH 0x001 /* send only changed routes */
65 #define WS_ST_RIP2_ALL 0x002 /* send full featured RIPv2 */
66 #define WS_ST_AG 0x004 /* ok to aggregate subnets */
67 #define WS_ST_SUPER_AG 0x008 /* ok to aggregate networks */
68 #define WS_ST_QUERY 0x010 /* responding to a query */
69 #define WS_ST_TO_ON_NET 0x020 /* sending onto one of our nets */
70 #define WS_ST_DEFAULT 0x040 /* faking a default */
71 } ws;
72
73 /* A buffer for what can be heard by both RIPv1 and RIPv2 listeners */
74 struct ws_buf v12buf;
75 union pkt_buf ripv12_buf;
76
77 /* Another for only RIPv2 listeners */
78 struct ws_buf v2buf;
79 union pkt_buf rip_v2_buf;
80
81
82
83 void
84 bufinit(void)
85 {
86 ripv12_buf.rip.rip_cmd = RIPCMD_RESPONSE;
87 v12buf.buf = &ripv12_buf.rip;
88 v12buf.base = &v12buf.buf->rip_nets[0];
89
90 rip_v2_buf.rip.rip_cmd = RIPCMD_RESPONSE;
91 rip_v2_buf.rip.rip_vers = RIPv2;
92 v2buf.buf = &rip_v2_buf.rip;
93 v2buf.base = &v2buf.buf->rip_nets[0];
94 }
95
96
97 /* Send the contents of the global buffer via the non-multicast socket
98 */
99 int /* <0 on failure */
100 output(enum output_type type,
101 struct sockaddr_in *dst, /* send to here */
102 struct interface *ifp,
103 struct rip *buf,
104 int size) /* this many bytes */
105 {
106 struct sockaddr_in in;
107 int flags;
108 const char *msg;
109 int res;
110 naddr tgt_mcast;
111 int soc;
112 int serrno;
113
114 in = *dst;
115 if (in.sin_port == 0)
116 in.sin_port = htons(RIP_PORT);
117 #ifdef _HAVE_SIN_LEN
118 if (in.sin_len == 0)
119 in.sin_len = sizeof(in);
120 #endif
121
122 soc = rip_sock;
123 flags = 0;
124
125 switch (type) {
126 case OUT_QUERY:
127 msg = "Answer Query";
128 if (soc < 0)
129 soc = ifp->int_rip_sock;
130 break;
131 case OUT_UNICAST:
132 msg = "Send";
133 if (soc < 0)
134 soc = ifp->int_rip_sock;
135 flags = MSG_DONTROUTE;
136 break;
137 case OUT_BROADCAST:
138 if (ifp->int_if_flags & IFF_POINTOPOINT) {
139 msg = "Send";
140 } else {
141 msg = "Send bcast";
142 }
143 flags = MSG_DONTROUTE;
144 break;
145 case OUT_MULTICAST:
146 if (ifp->int_if_flags & 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 #ifdef MCAST_PPP_BUG
157 /* Do not specify the primary interface
158 * explicitly if we have the multicast
159 * point-to-point kernel bug, since the
160 * kernel will do the wrong thing if the
161 * local address of a point-to-point link
162 * is the same as the address of an ordinary
163 * interface.
164 */
165 if (ifp->int_addr == myaddr) {
166 tgt_mcast = 0;
167 } else
168 #endif
169 tgt_mcast = ifp->int_addr;
170 if (0 > setsockopt(rip_sock,
171 IPPROTO_IP, IP_MULTICAST_IF,
172 &tgt_mcast,
173 sizeof(tgt_mcast))) {
174 serrno = errno;
175 LOGERR("setsockopt(rip_sock,"
176 "IP_MULTICAST_IF)");
177 errno = serrno;
178 ifp = 0;
179 return -1;
180 }
181 rip_sock_mcast = ifp;
182 }
183 in.sin_addr.s_addr = htonl(INADDR_RIP_GROUP);
184 }
185 break;
186
187 case NO_OUT_MULTICAST:
188 case NO_OUT_RIPV2:
189 default:
190 #ifdef DEBUG
191 abort();
192 #endif
193 return -1;
194 }
195
196 trace_rip(msg, "to", &in, ifp, buf, size);
197
198 res = sendto(soc, buf, size, flags,
199 (struct sockaddr *)&in, sizeof(in));
200 if (res < 0
201 && (ifp == 0 || !(ifp->int_state & IS_BROKE))) {
202 serrno = errno;
203 msglog("%s sendto(%s%s%s.%d): %s", msg,
204 ifp != 0 ? ifp->int_name : "",
205 ifp != 0 ? ", " : "",
206 inet_ntoa(in.sin_addr),
207 ntohs(in.sin_port),
208 strerror(errno));
209 errno = serrno;
210 }
211
212 return res;
213 }
214
215
216 /* Find the first key for a packet to send.
217 * Try for a key that is eligible and has not expired, but settle for
218 * the last key if they have all expired.
219 * If no key is ready yet, give up.
220 */
221 struct auth *
222 find_auth(struct interface *ifp)
223 {
224 struct auth *ap, *res;
225 int i;
226
227
228 if (ifp == 0)
229 return 0;
230
231 res = 0;
232 ap = ifp->int_auth;
233 for (i = 0; i < MAX_AUTH_KEYS; i++, ap++) {
234 /* stop looking after the last key */
235 if (ap->type == RIP_AUTH_NONE)
236 break;
237
238 /* ignore keys that are not ready yet */
239 if ((u_long)ap->start > (u_long)clk.tv_sec)
240 continue;
241
242 if ((u_long)ap->end < (u_long)clk.tv_sec) {
243 /* note best expired password as a fall-back */
244 if (res == 0 || (u_long)ap->end > (u_long)res->end)
245 res = ap;
246 continue;
247 }
248
249 /* note key with the best future */
250 if (res == 0 || (u_long)res->end < (u_long)ap->end)
251 res = ap;
252 }
253 return res;
254 }
255
256
257 void
258 clr_ws_buf(struct ws_buf *wb,
259 struct auth *ap)
260 {
261 struct netauth *na;
262
263 wb->lim = wb->base + NETS_LEN;
264 wb->n = wb->base;
265 memset(wb->n, 0, NETS_LEN*sizeof(*wb->n));
266
267 /* (start to) install authentication if appropriate
268 */
269 if (ap == 0)
270 return;
271
272 na = (struct netauth*)wb->n;
273 if (ap->type == RIP_AUTH_PW) {
274 na->a_family = RIP_AF_AUTH;
275 na->a_type = RIP_AUTH_PW;
276 memcpy(na->au.au_pw, ap->key, sizeof(na->au.au_pw));
277 wb->n++;
278
279 } else if (ap->type == RIP_AUTH_MD5) {
280 na->a_family = RIP_AF_AUTH;
281 na->a_type = RIP_AUTH_MD5;
282 na->au.a_md5.md5_keyid = ap->keyid;
283 na->au.a_md5.md5_auth_len = RIP_AUTH_MD5_LEN;
284 na->au.a_md5.md5_seqno = htonl(clk.tv_sec);
285 wb->n++;
286 wb->lim--; /* make room for trailer */
287 }
288 }
289
290
291 void
292 end_md5_auth(struct ws_buf *wb,
293 struct auth *ap)
294 {
295 struct netauth *na, *na2;
296 MD5_CTX md5_ctx;
297 int len;
298
299
300 na = (struct netauth*)wb->base;
301 na2 = (struct netauth*)wb->n;
302 len = (char *)na2-(char *)wb->buf;
303 na2->a_family = RIP_AF_AUTH;
304 na2->a_type = htons(1);
305 na->au.a_md5.md5_pkt_len = htons(len);
306 MD5Init(&md5_ctx);
307 MD5Update(&md5_ctx, (u_char *)wb->buf, len);
308 MD5Update(&md5_ctx, ap->key, RIP_AUTH_MD5_LEN);
309 MD5Final(na2->au.au_pw, &md5_ctx);
310 wb->n++;
311 }
312
313
314 /* Send the buffer
315 */
316 static void
317 supply_write(struct ws_buf *wb)
318 {
319 /* Output multicast only if legal.
320 * If we would multicast and it would be illegal, then discard the
321 * packet.
322 */
323 switch (wb->type) {
324 case NO_OUT_MULTICAST:
325 trace_pkt("skip multicast to %s because impossible",
326 naddr_ntoa(ws.to.sin_addr.s_addr));
327 break;
328 case NO_OUT_RIPV2:
329 break;
330 default:
331 if (ws.a != 0 && ws.a->type == RIP_AUTH_MD5)
332 end_md5_auth(wb,ws.a);
333 if (output(wb->type, &ws.to, ws.ifp, wb->buf,
334 ((char *)wb->n - (char*)wb->buf)) < 0
335 && ws.ifp != 0)
336 if_sick(ws.ifp);
337 ws.npackets++;
338 break;
339 }
340
341 clr_ws_buf(wb,ws.a);
342 }
343
344
345 /* put an entry into the packet
346 */
347 static void
348 supply_out(struct ag_info *ag)
349 {
350 int i;
351 naddr mask, v1_mask, dst_h, ddst_h = 0;
352 struct ws_buf *wb;
353
354
355 /* Skip this route if doing a flash update and it and the routes
356 * it aggregates have not changed recently.
357 */
358 if (ag->ag_seqno < update_seqno
359 && (ws.state & WS_ST_FLASH))
360 return;
361
362 dst_h = ag->ag_dst_h;
363 mask = ag->ag_mask;
364 v1_mask = ripv1_mask_host(htonl(dst_h),
365 (ws.state & WS_ST_TO_ON_NET) ? ws.ifp : 0);
366 i = 0;
367
368 /* If we are sending RIPv2 packets that cannot (or must not) be
369 * heard by RIPv1 listeners, do not worry about sub- or supernets.
370 * Subnets (from other networks) can only be sent via multicast.
371 * A pair of subnet routes might have been promoted so that they
372 * are legal to send by RIPv1.
373 * If RIPv1 is off, use the multicast buffer.
374 */
375 if ((ws.state & WS_ST_RIP2_ALL)
376 || ((ag->ag_state & AGS_RIPV2) && v1_mask != mask)) {
377 /* use the RIPv2-only buffer */
378 wb = &v2buf;
379
380 } else {
381 /* use the RIPv1-or-RIPv2 buffer */
382 wb = &v12buf;
383
384 /* Convert supernet route into corresponding set of network
385 * routes for RIPv1, but leave non-contiguous netmasks
386 * to ag_check().
387 */
388 if (v1_mask > mask
389 && mask + (mask & -mask) == 0) {
390 ddst_h = v1_mask & -v1_mask;
391 i = (v1_mask & ~mask)/ddst_h;
392
393 if (i > ws.gen_limit) {
394 /* Punt if we would have to generate an
395 * unreasonable number of routes.
396 */
397 if (TRACECONTENTS)
398 trace_misc("sending %s-->%s as 1"
399 " instead of %d routes",
400 addrname(htonl(dst_h), mask,
401 1),
402 naddr_ntoa(ws.to.sin_addr
403 .s_addr),
404 i+1);
405 i = 0;
406
407 } else {
408 mask = v1_mask;
409 ws.gen_limit -= i;
410 }
411 }
412 }
413
414 do {
415 wb->n->n_family = RIP_AF_INET;
416 wb->n->n_dst = htonl(dst_h);
417 /* If the route is from router-discovery or we are
418 * shutting down, admit only a bad metric.
419 */
420 wb->n->n_metric = ((stopint || ag->ag_metric < 1)
421 ? HOPCNT_INFINITY
422 : ag->ag_metric);
423 wb->n->n_metric = htonl(wb->n->n_metric);
424 /* Any non-zero bits in the supposedly unused RIPv1 fields
425 * cause the old `routed` to ignore the route.
426 * That means the mask and so forth cannot be sent
427 * in the hybrid RIPv1/RIPv2 mode.
428 */
429 if (ws.state & WS_ST_RIP2_ALL) {
430 if (ag->ag_nhop != 0
431 && ((ws.state & WS_ST_QUERY)
432 || (ag->ag_nhop != ws.ifp->int_addr
433 && on_net(ag->ag_nhop,
434 ws.ifp->int_net,
435 ws.ifp->int_mask))))
436 wb->n->n_nhop = ag->ag_nhop;
437 wb->n->n_mask = htonl(mask);
438 wb->n->n_tag = ag->ag_tag;
439 }
440 dst_h += ddst_h;
441
442 if (++wb->n >= wb->lim)
443 supply_write(wb);
444 } while (i-- != 0);
445 }
446
447
448 /* supply one route from the table
449 */
450 /* ARGSUSED */
451 static int
452 walk_supply(struct radix_node *rn,
453 struct walkarg *argp UNUSED)
454 {
455 #define RT ((struct rt_entry *)rn)
456 u_short ags;
457 char metric, pref;
458 naddr dst, nhop;
459 struct rt_spare *rts;
460 int i;
461
462
463 /* Do not advertise external remote interfaces or passive interfaces.
464 */
465 if ((RT->rt_state & RS_IF)
466 && RT->rt_ifp != 0
467 && (RT->rt_ifp->int_state & IS_PASSIVE)
468 && !(RT->rt_state & RS_MHOME))
469 return 0;
470
471 /* If being quiet about our ability to forward, then
472 * do not say anything unless responding to a query,
473 * except about our main interface.
474 */
475 if (!supplier && !(ws.state & WS_ST_QUERY)
476 && !(RT->rt_state & RS_MHOME))
477 return 0;
478
479 dst = RT->rt_dst;
480
481 /* do not collide with the fake default route */
482 if (dst == RIP_DEFAULT
483 && (ws.state & WS_ST_DEFAULT))
484 return 0;
485
486 if (RT->rt_state & RS_NET_SYN) {
487 if (RT->rt_state & RS_NET_INT) {
488 /* Do not send manual synthetic network routes
489 * into the subnet.
490 */
491 if (on_net(ws.to.sin_addr.s_addr,
492 ntohl(dst), RT->rt_mask))
493 return 0;
494
495 } else {
496 /* Do not send automatic synthetic network routes
497 * if they are not needed because no RIPv1 listeners
498 * can hear them.
499 */
500 if (ws.state & WS_ST_RIP2_ALL)
501 return 0;
502
503 /* Do not send automatic synthetic network routes to
504 * the real subnet.
505 */
506 if (on_net(ws.to.sin_addr.s_addr,
507 ntohl(dst), RT->rt_mask))
508 return 0;
509 }
510 nhop = 0;
511
512 } else {
513 /* Advertise the next hop if this is not a route for one
514 * of our interfaces and the next hop is on the same
515 * network as the target.
516 * The final determination is made by supply_out().
517 */
518 if (!(RT->rt_state & RS_IF)
519 && RT->rt_gate != myaddr
520 && RT->rt_gate != loopaddr)
521 nhop = RT->rt_gate;
522 else
523 nhop = 0;
524 }
525
526 metric = RT->rt_metric;
527 ags = 0;
528
529 if (RT->rt_state & RS_MHOME) {
530 /* retain host route of multi-homed servers */
531 ;
532
533 } else if (RT_ISHOST(RT)) {
534 /* We should always suppress (into existing network routes)
535 * the host routes for the local end of our point-to-point
536 * links.
537 * If we are suppressing host routes in general, then do so.
538 * Avoid advertising host routes onto their own network,
539 * where they should be handled by proxy-ARP.
540 */
541 if ((RT->rt_state & RS_LOCAL)
542 || ridhosts
543 || on_net(dst, ws.to_net, ws.to_mask))
544 ags |= AGS_SUPPRESS;
545
546 /* Aggregate stray host routes into network routes if allowed.
547 * We cannot aggregate host routes into small network routes
548 * without confusing RIPv1 listeners into thinking the
549 * network routes are host routes.
550 */
551 if ((ws.state & WS_ST_AG)
552 && !(ws.state & WS_ST_RIP2_ALL))
553 ags |= AGS_AGGREGATE;
554
555 } else {
556 /* Always suppress network routes into other, existing
557 * network routes
558 */
559 ags |= AGS_SUPPRESS;
560
561 /* Generate supernets if allowed.
562 * If we can be heard by RIPv1 systems, we will
563 * later convert back to ordinary nets.
564 * This unifies dealing with received supernets.
565 */
566 if ((ws.state & WS_ST_AG)
567 && ((RT->rt_state & RS_SUBNET)
568 || (ws.state & WS_ST_SUPER_AG)))
569 ags |= AGS_AGGREGATE;
570 }
571
572 /* Do not send RIPv1 advertisements of subnets to other
573 * networks. If possible, multicast them by RIPv2.
574 */
575 if ((RT->rt_state & RS_SUBNET)
576 && !(ws.state & WS_ST_RIP2_ALL)
577 && !on_net(dst, ws.to_std_net, ws.to_std_mask))
578 ags |= AGS_RIPV2 | AGS_AGGREGATE;
579
580
581 /* Do not send a route back to where it came from, except in
582 * response to a query. This is "split-horizon". That means not
583 * advertising back to the same network and so via the same interface.
584 *
585 * We want to suppress routes that might have been fragmented
586 * from this route by a RIPv1 router and sent back to us, and so we
587 * cannot forget this route here. Let the split-horizon route
588 * suppress the fragmented routes and then itself be forgotten.
589 *
590 * Include the routes for both ends of point-to-point interfaces
591 * among those suppressed by split-horizon, since the other side
592 * should knows them as well as we do.
593 *
594 * Notice spare routes with the same metric that we are about to
595 * advertise, to split the horizon on redundant, inactive paths.
596 */
597 if (ws.ifp != 0
598 && !(ws.state & WS_ST_QUERY)
599 && (ws.state & WS_ST_TO_ON_NET)
600 && (!(RT->rt_state & RS_IF)
601 || ws.ifp->int_if_flags & IFF_POINTOPOINT)) {
602 for (rts = RT->rt_spares, i = NUM_SPARES; i != 0; i--, rts++) {
603 if (rts->rts_metric > metric
604 || rts->rts_ifp != ws.ifp)
605 continue;
606
607 /* If we do not mark the route with AGS_SPLIT_HZ here,
608 * it will be poisoned-reverse, or advertised back
609 * toward its source with an infinite metric.
610 * If we have recently advertised the route with a
611 * better metric than we now have, then we should
612 * poison-reverse the route before suppressing it for
613 * split-horizon.
614 *
615 * In almost all cases, if there is no spare for the
616 * route then it is either old and dead or a brand
617 * new route. If it is brand new, there is no need
618 * for poison-reverse. If it is old and dead, it
619 * is already poisoned.
620 */
621 if (RT->rt_poison_time < now_expire
622 || RT->rt_poison_metric >= metric
623 || RT->rt_spares[1].rts_gate == 0) {
624 ags |= AGS_SPLIT_HZ;
625 ags &= ~AGS_SUPPRESS;
626 }
627 metric = HOPCNT_INFINITY;
628 break;
629 }
630 }
631
632 /* Keep track of the best metric with which the
633 * route has been advertised recently.
634 */
635 if (RT->rt_poison_metric >= metric
636 || RT->rt_poison_time < now_expire) {
637 RT->rt_poison_time = now.tv_sec;
638 RT->rt_poison_metric = metric;
639 }
640
641 /* Adjust the outgoing metric by the cost of the link.
642 * Avoid aggregation when a route is counting to infinity.
643 */
644 pref = RT->rt_poison_metric + ws.metric;
645 metric += ws.metric;
646
647 /* Do not advertise stable routes that will be ignored,
648 * unless we are answering a query.
649 * If the route recently was advertised with a metric that
650 * would have been less than infinity through this interface,
651 * we need to continue to advertise it in order to poison it.
652 */
653 if (metric >= HOPCNT_INFINITY) {
654 if (!(ws.state & WS_ST_QUERY)
655 && (pref >= HOPCNT_INFINITY
656 || RT->rt_poison_time < now_garbage))
657 return 0;
658
659 metric = HOPCNT_INFINITY;
660 }
661
662 ag_check(dst, RT->rt_mask, 0, nhop, metric, pref,
663 RT->rt_seqno, RT->rt_tag, ags, supply_out);
664 return 0;
665 #undef RT
666 }
667
668
669 /* Supply dst with the contents of the routing tables.
670 * If this won't fit in one packet, chop it up into several.
671 */
672 void
673 supply(struct sockaddr_in *dst,
674 struct interface *ifp, /* output interface */
675 enum output_type type,
676 int flash, /* 1=flash update */
677 int vers, /* RIP version */
678 int passwd_ok) /* OK to include cleartext password */
679 {
680 struct rt_entry *rt;
681 int def_metric;
682
683
684 ws.state = 0;
685 ws.gen_limit = 1024;
686
687 ws.to = *dst;
688 ws.to_std_mask = std_mask(ws.to.sin_addr.s_addr);
689 ws.to_std_net = ntohl(ws.to.sin_addr.s_addr) & ws.to_std_mask;
690
691 if (ifp != 0) {
692 ws.to_mask = ifp->int_mask;
693 ws.to_net = ifp->int_net;
694 if (on_net(ws.to.sin_addr.s_addr, ws.to_net, ws.to_mask))
695 ws.state |= WS_ST_TO_ON_NET;
696
697 } else {
698 ws.to_mask = ripv1_mask_net(ws.to.sin_addr.s_addr, 0);
699 ws.to_net = ntohl(ws.to.sin_addr.s_addr) & ws.to_mask;
700 rt = rtfind(dst->sin_addr.s_addr);
701 if (rt)
702 ifp = rt->rt_ifp;
703 }
704
705 ws.npackets = 0;
706 if (flash)
707 ws.state |= WS_ST_FLASH;
708
709 if ((ws.ifp = ifp) == 0) {
710 ws.metric = 1;
711 } else {
712 /* Adjust the advertised metric by the outgoing interface
713 * metric.
714 */
715 ws.metric = ifp->int_metric+1;
716 }
717
718 ripv12_buf.rip.rip_vers = vers;
719
720 switch (type) {
721 case OUT_MULTICAST:
722 if (ifp->int_if_flags & IFF_MULTICAST)
723 v2buf.type = OUT_MULTICAST;
724 else
725 v2buf.type = NO_OUT_MULTICAST;
726 v12buf.type = OUT_BROADCAST;
727 break;
728
729 case OUT_QUERY:
730 ws.state |= WS_ST_QUERY;
731 /* fall through */
732 case OUT_BROADCAST:
733 case OUT_UNICAST:
734 v2buf.type = (vers == RIPv2) ? type : NO_OUT_RIPV2;
735 v12buf.type = type;
736 break;
737
738 case NO_OUT_MULTICAST:
739 case NO_OUT_RIPV2:
740 break; /* no output */
741 }
742
743 if (vers == RIPv2) {
744 /* full RIPv2 only if cannot be heard by RIPv1 listeners */
745 if (type != OUT_BROADCAST)
746 ws.state |= WS_ST_RIP2_ALL;
747 if ((ws.state & WS_ST_QUERY)
748 || !(ws.state & WS_ST_TO_ON_NET)) {
749 ws.state |= (WS_ST_AG | WS_ST_SUPER_AG);
750 } else if (ifp == 0 || !(ifp->int_state & IS_NO_AG)) {
751 ws.state |= WS_ST_AG;
752 if (type != OUT_BROADCAST
753 && (ifp == 0
754 || !(ifp->int_state & IS_NO_SUPER_AG)))
755 ws.state |= WS_ST_SUPER_AG;
756 }
757 }
758
759 ws.a = (vers == RIPv2) ? find_auth(ifp) : 0;
760 if (!passwd_ok && ws.a != 0 && ws.a->type == RIP_AUTH_PW)
761 ws.a = 0;
762 clr_ws_buf(&v12buf,ws.a);
763 clr_ws_buf(&v2buf,ws.a);
764
765 /* Fake a default route if asked and if there is not already
766 * a better, real default route.
767 */
768 if (supplier && (def_metric = ifp->int_d_metric) != 0) {
769 if (0 == (rt = rtget(RIP_DEFAULT, 0))
770 || rt->rt_metric+ws.metric >= def_metric) {
771 ws.state |= WS_ST_DEFAULT;
772 ag_check(0, 0, 0, 0, def_metric, def_metric,
773 0, 0, 0, supply_out);
774 } else {
775 def_metric = rt->rt_metric+ws.metric;
776 }
777
778 /* If both RIPv2 and the poor-man's router discovery
779 * kludge are on, arrange to advertise an extra
780 * default route via RIPv1.
781 */
782 if ((ws.state & WS_ST_RIP2_ALL)
783 && (ifp->int_state & IS_PM_RDISC)) {
784 ripv12_buf.rip.rip_vers = RIPv1;
785 v12buf.n->n_family = RIP_AF_INET;
786 v12buf.n->n_dst = htonl(RIP_DEFAULT);
787 v12buf.n->n_metric = htonl(def_metric);
788 v12buf.n++;
789 }
790 }
791
792 rn_walktree(rhead, walk_supply, 0);
793 ag_flush(0,0,supply_out);
794
795 /* Flush the packet buffers, provided they are not empty and
796 * do not contain only the password.
797 */
798 if (v12buf.n != v12buf.base
799 && (v12buf.n > v12buf.base+1
800 || v12buf.base->n_family != RIP_AF_AUTH))
801 supply_write(&v12buf);
802 if (v2buf.n != v2buf.base
803 && (v2buf.n > v2buf.base+1
804 || v2buf.base->n_family != RIP_AF_AUTH))
805 supply_write(&v2buf);
806
807 /* If we sent nothing and this is an answer to a query, send
808 * an empty buffer.
809 */
810 if (ws.npackets == 0
811 && (ws.state & WS_ST_QUERY))
812 supply_write(&v12buf);
813 }
814
815
816 /* send all of the routing table or just do a flash update
817 */
818 void
819 rip_bcast(int flash)
820 {
821 #ifdef _HAVE_SIN_LEN
822 static struct sockaddr_in dst = {sizeof(dst), AF_INET, 0, {0}, {0}};
823 #else
824 static struct sockaddr_in dst = {AF_INET};
825 #endif
826 struct interface *ifp;
827 enum output_type type;
828 int vers;
829 struct timeval rtime;
830
831
832 need_flash = 0;
833 intvl_random(&rtime, MIN_WAITTIME, MAX_WAITTIME);
834 no_flash = rtime;
835 timevaladd(&no_flash, &now);
836
837 if (rip_sock < 0)
838 return;
839
840 trace_act("send %s and inhibit dynamic updates for %.3f sec",
841 flash ? "dynamic update" : "all routes",
842 rtime.tv_sec + ((float)rtime.tv_usec)/1000000.0);
843
844 for (ifp = ifnet; ifp != 0; ifp = ifp->int_next) {
845 /* Skip interfaces not doing RIP.
846 * Do try broken interfaces to see if they have healed.
847 */
848 if (IS_RIP_OUT_OFF(ifp->int_state))
849 continue;
850
851 /* skip turned off interfaces */
852 if (!iff_up(ifp->int_if_flags))
853 continue;
854
855 vers = (ifp->int_state & IS_NO_RIPV1_OUT) ? RIPv2 : RIPv1;
856
857 if (ifp->int_if_flags & IFF_BROADCAST) {
858 /* ordinary, hardware interface */
859 dst.sin_addr.s_addr = ifp->int_brdaddr;
860
861 if (vers == RIPv2
862 && !(ifp->int_state & IS_NO_RIP_MCAST)) {
863 type = OUT_MULTICAST;
864 } else {
865 type = OUT_BROADCAST;
866 }
867
868 } else if (ifp->int_if_flags & IFF_POINTOPOINT) {
869 /* point-to-point hardware interface */
870 dst.sin_addr.s_addr = ifp->int_dstaddr;
871 type = OUT_UNICAST;
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 */
894 void
895 rip_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 for (ifp = ifnet; ifp; ifp = ifp->int_next) {
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 }
MP support for (parts of) the network stack