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1 | // SPDX-License-Identifier: GPL-2.0-or-later | |
2 | /* RIP version 1 and 2. | |
3 | * Copyright (C) 2005 6WIND <alain.ritoux@6wind.com> | |
4 | * Copyright (C) 1997, 98, 99 Kunihiro Ishiguro <kunihiro@zebra.org> | |
5 | */ | |
6 | ||
7 | #include <zebra.h> | |
8 | ||
9 | #include "vrf.h" | |
10 | #include "if.h" | |
11 | #include "command.h" | |
12 | #include "prefix.h" | |
13 | #include "table.h" | |
14 | #include "frrevent.h" | |
15 | #include "memory.h" | |
16 | #include "log.h" | |
17 | #include "stream.h" | |
18 | #include "filter.h" | |
19 | #include "sockunion.h" | |
20 | #include "sockopt.h" | |
21 | #include "routemap.h" | |
22 | #include "if_rmap.h" | |
23 | #include "plist.h" | |
24 | #include "distribute.h" | |
25 | #ifdef CRYPTO_INTERNAL | |
26 | #include "md5.h" | |
27 | #endif | |
28 | #include "keychain.h" | |
29 | #include "privs.h" | |
30 | #include "lib_errors.h" | |
31 | #include "northbound_cli.h" | |
32 | #include "network.h" | |
33 | #include "lib/printfrr.h" | |
34 | ||
35 | #include "ripd/ripd.h" | |
36 | #include "ripd/rip_nb.h" | |
37 | #include "ripd/rip_debug.h" | |
38 | #include "ripd/rip_errors.h" | |
39 | #include "ripd/rip_interface.h" | |
40 | ||
41 | /* UDP receive buffer size */ | |
42 | #define RIP_UDP_RCV_BUF 41600 | |
43 | ||
44 | DEFINE_MGROUP(RIPD, "ripd"); | |
45 | DEFINE_MTYPE_STATIC(RIPD, RIP, "RIP structure"); | |
46 | DEFINE_MTYPE_STATIC(RIPD, RIP_VRF_NAME, "RIP VRF name"); | |
47 | DEFINE_MTYPE_STATIC(RIPD, RIP_INFO, "RIP route info"); | |
48 | DEFINE_MTYPE_STATIC(RIPD, RIP_DISTANCE, "RIP distance"); | |
49 | ||
50 | /* Prototypes. */ | |
51 | static void rip_output_process(struct connected *, struct sockaddr_in *, int, | |
52 | uint8_t); | |
53 | static void rip_triggered_update(struct event *); | |
54 | static int rip_update_jitter(unsigned long); | |
55 | static void rip_distance_table_node_cleanup(struct route_table *table, | |
56 | struct route_node *node); | |
57 | static void rip_instance_enable(struct rip *rip, struct vrf *vrf, int sock); | |
58 | static void rip_instance_disable(struct rip *rip); | |
59 | ||
60 | static void rip_distribute_update(struct distribute_ctx *ctx, | |
61 | struct distribute *dist); | |
62 | ||
63 | static void rip_if_rmap_update(struct if_rmap_ctx *ctx, | |
64 | struct if_rmap *if_rmap); | |
65 | ||
66 | /* RIP output routes type. */ | |
67 | enum { rip_all_route, rip_changed_route }; | |
68 | ||
69 | /* RIP command strings. */ | |
70 | static const struct message rip_msg[] = {{RIP_REQUEST, "REQUEST"}, | |
71 | {RIP_RESPONSE, "RESPONSE"}, | |
72 | {RIP_TRACEON, "TRACEON"}, | |
73 | {RIP_TRACEOFF, "TRACEOFF"}, | |
74 | {RIP_POLL, "POLL"}, | |
75 | {RIP_POLL_ENTRY, "POLL ENTRY"}, | |
76 | {0}}; | |
77 | ||
78 | /* Generate rb-tree of RIP instances. */ | |
79 | static inline int rip_instance_compare(const struct rip *a, const struct rip *b) | |
80 | { | |
81 | return strcmp(a->vrf_name, b->vrf_name); | |
82 | } | |
83 | RB_GENERATE(rip_instance_head, rip, entry, rip_instance_compare) | |
84 | ||
85 | struct rip_instance_head rip_instances = RB_INITIALIZER(&rip_instances); | |
86 | ||
87 | /* Utility function to set broadcast option to the socket. */ | |
88 | static int sockopt_broadcast(int sock) | |
89 | { | |
90 | int ret; | |
91 | int on = 1; | |
92 | ||
93 | ret = setsockopt(sock, SOL_SOCKET, SO_BROADCAST, (char *)&on, | |
94 | sizeof(on)); | |
95 | if (ret < 0) { | |
96 | zlog_warn("can't set sockopt SO_BROADCAST to socket %d", sock); | |
97 | return -1; | |
98 | } | |
99 | return 0; | |
100 | } | |
101 | ||
102 | int rip_route_rte(struct rip_info *rinfo) | |
103 | { | |
104 | return (rinfo->type == ZEBRA_ROUTE_RIP | |
105 | && rinfo->sub_type == RIP_ROUTE_RTE); | |
106 | } | |
107 | ||
108 | static struct rip_info *rip_info_new(void) | |
109 | { | |
110 | return XCALLOC(MTYPE_RIP_INFO, sizeof(struct rip_info)); | |
111 | } | |
112 | ||
113 | void rip_info_free(struct rip_info *rinfo) | |
114 | { | |
115 | XFREE(MTYPE_RIP_INFO, rinfo); | |
116 | } | |
117 | ||
118 | struct rip *rip_info_get_instance(const struct rip_info *rinfo) | |
119 | { | |
120 | return route_table_get_info(rinfo->rp->table); | |
121 | } | |
122 | ||
123 | /* RIP route garbage collect timer. */ | |
124 | static void rip_garbage_collect(struct event *t) | |
125 | { | |
126 | struct rip_info *rinfo; | |
127 | struct route_node *rp; | |
128 | ||
129 | rinfo = EVENT_ARG(t); | |
130 | ||
131 | /* Off timeout timer. */ | |
132 | EVENT_OFF(rinfo->t_timeout); | |
133 | ||
134 | /* Get route_node pointer. */ | |
135 | rp = rinfo->rp; | |
136 | ||
137 | /* Unlock route_node. */ | |
138 | listnode_delete(rp->info, rinfo); | |
139 | if (list_isempty((struct list *)rp->info)) { | |
140 | list_delete((struct list **)&rp->info); | |
141 | route_unlock_node(rp); | |
142 | } | |
143 | ||
144 | /* Free RIP routing information. */ | |
145 | rip_info_free(rinfo); | |
146 | } | |
147 | ||
148 | static void rip_timeout_update(struct rip *rip, struct rip_info *rinfo); | |
149 | ||
150 | /* Add new route to the ECMP list. | |
151 | * RETURN: the new entry added in the list, or NULL if it is not the first | |
152 | * entry and ECMP is not allowed. | |
153 | */ | |
154 | struct rip_info *rip_ecmp_add(struct rip *rip, struct rip_info *rinfo_new) | |
155 | { | |
156 | struct route_node *rp = rinfo_new->rp; | |
157 | struct rip_info *rinfo = NULL; | |
158 | struct list *list = NULL; | |
159 | ||
160 | if (rp->info == NULL) | |
161 | rp->info = list_new(); | |
162 | list = (struct list *)rp->info; | |
163 | ||
164 | /* If ECMP is not allowed and some entry already exists in the list, | |
165 | * do nothing. */ | |
166 | if (listcount(list) && !rip->ecmp) | |
167 | return NULL; | |
168 | ||
169 | rinfo = rip_info_new(); | |
170 | memcpy(rinfo, rinfo_new, sizeof(struct rip_info)); | |
171 | listnode_add(list, rinfo); | |
172 | ||
173 | if (rip_route_rte(rinfo)) { | |
174 | rip_timeout_update(rip, rinfo); | |
175 | rip_zebra_ipv4_add(rip, rp); | |
176 | } | |
177 | ||
178 | /* Set the route change flag on the first entry. */ | |
179 | rinfo = listgetdata(listhead(list)); | |
180 | SET_FLAG(rinfo->flags, RIP_RTF_CHANGED); | |
181 | ||
182 | /* Signal the output process to trigger an update (see section 2.5). */ | |
183 | rip_event(rip, RIP_TRIGGERED_UPDATE, 0); | |
184 | ||
185 | return rinfo; | |
186 | } | |
187 | ||
188 | /* Replace the ECMP list with the new route. | |
189 | * RETURN: the new entry added in the list | |
190 | */ | |
191 | struct rip_info *rip_ecmp_replace(struct rip *rip, struct rip_info *rinfo_new) | |
192 | { | |
193 | struct route_node *rp = rinfo_new->rp; | |
194 | struct list *list = (struct list *)rp->info; | |
195 | struct rip_info *rinfo = NULL, *tmp_rinfo = NULL; | |
196 | struct listnode *node = NULL, *nextnode = NULL; | |
197 | ||
198 | if (list == NULL || listcount(list) == 0) | |
199 | return rip_ecmp_add(rip, rinfo_new); | |
200 | ||
201 | /* Get the first entry */ | |
202 | rinfo = listgetdata(listhead(list)); | |
203 | ||
204 | /* Learnt route replaced by a local one. Delete it from zebra. */ | |
205 | if (rip_route_rte(rinfo) && !rip_route_rte(rinfo_new)) | |
206 | if (CHECK_FLAG(rinfo->flags, RIP_RTF_FIB)) | |
207 | rip_zebra_ipv4_delete(rip, rp); | |
208 | ||
209 | /* Re-use the first entry, and delete the others. */ | |
210 | for (ALL_LIST_ELEMENTS(list, node, nextnode, tmp_rinfo)) { | |
211 | if (tmp_rinfo == rinfo) | |
212 | continue; | |
213 | ||
214 | EVENT_OFF(tmp_rinfo->t_timeout); | |
215 | EVENT_OFF(tmp_rinfo->t_garbage_collect); | |
216 | list_delete_node(list, node); | |
217 | rip_info_free(tmp_rinfo); | |
218 | } | |
219 | ||
220 | EVENT_OFF(rinfo->t_timeout); | |
221 | EVENT_OFF(rinfo->t_garbage_collect); | |
222 | memcpy(rinfo, rinfo_new, sizeof(struct rip_info)); | |
223 | ||
224 | if (rip_route_rte(rinfo)) { | |
225 | rip_timeout_update(rip, rinfo); | |
226 | /* The ADD message implies an update. */ | |
227 | rip_zebra_ipv4_add(rip, rp); | |
228 | } | |
229 | ||
230 | /* Set the route change flag. */ | |
231 | SET_FLAG(rinfo->flags, RIP_RTF_CHANGED); | |
232 | ||
233 | /* Signal the output process to trigger an update (see section 2.5). */ | |
234 | rip_event(rip, RIP_TRIGGERED_UPDATE, 0); | |
235 | ||
236 | return rinfo; | |
237 | } | |
238 | ||
239 | /* Delete one route from the ECMP list. | |
240 | * RETURN: | |
241 | * null - the entry is freed, and other entries exist in the list | |
242 | * the entry - the entry is the last one in the list; its metric is set | |
243 | * to INFINITY, and the garbage collector is started for it | |
244 | */ | |
245 | struct rip_info *rip_ecmp_delete(struct rip *rip, struct rip_info *rinfo) | |
246 | { | |
247 | struct route_node *rp = rinfo->rp; | |
248 | struct list *list = (struct list *)rp->info; | |
249 | ||
250 | EVENT_OFF(rinfo->t_timeout); | |
251 | ||
252 | if (listcount(list) > 1) { | |
253 | /* Some other ECMP entries still exist. Just delete this entry. | |
254 | */ | |
255 | EVENT_OFF(rinfo->t_garbage_collect); | |
256 | listnode_delete(list, rinfo); | |
257 | if (rip_route_rte(rinfo) | |
258 | && CHECK_FLAG(rinfo->flags, RIP_RTF_FIB)) | |
259 | /* The ADD message implies the update. */ | |
260 | rip_zebra_ipv4_add(rip, rp); | |
261 | rip_info_free(rinfo); | |
262 | rinfo = NULL; | |
263 | } else { | |
264 | assert(rinfo == listgetdata(listhead(list))); | |
265 | ||
266 | /* This is the only entry left in the list. We must keep it in | |
267 | * the list for garbage collection time, with INFINITY metric. | |
268 | */ | |
269 | ||
270 | rinfo->metric = RIP_METRIC_INFINITY; | |
271 | RIP_TIMER_ON(rinfo->t_garbage_collect, rip_garbage_collect, | |
272 | rip->garbage_time); | |
273 | ||
274 | if (rip_route_rte(rinfo) | |
275 | && CHECK_FLAG(rinfo->flags, RIP_RTF_FIB)) | |
276 | rip_zebra_ipv4_delete(rip, rp); | |
277 | } | |
278 | ||
279 | /* Set the route change flag on the first entry. */ | |
280 | rinfo = listgetdata(listhead(list)); | |
281 | SET_FLAG(rinfo->flags, RIP_RTF_CHANGED); | |
282 | ||
283 | /* Signal the output process to trigger an update (see section 2.5). */ | |
284 | rip_event(rip, RIP_TRIGGERED_UPDATE, 0); | |
285 | ||
286 | return rinfo; | |
287 | } | |
288 | ||
289 | /* Timeout RIP routes. */ | |
290 | static void rip_timeout(struct event *t) | |
291 | { | |
292 | struct rip_info *rinfo = EVENT_ARG(t); | |
293 | struct rip *rip = rip_info_get_instance(rinfo); | |
294 | ||
295 | rip_ecmp_delete(rip, rinfo); | |
296 | } | |
297 | ||
298 | static void rip_timeout_update(struct rip *rip, struct rip_info *rinfo) | |
299 | { | |
300 | if (rinfo->metric != RIP_METRIC_INFINITY) { | |
301 | EVENT_OFF(rinfo->t_timeout); | |
302 | event_add_timer(master, rip_timeout, rinfo, rip->timeout_time, | |
303 | &rinfo->t_timeout); | |
304 | } | |
305 | } | |
306 | ||
307 | static int rip_filter(int rip_distribute, struct prefix_ipv4 *p, | |
308 | struct rip_interface *ri) | |
309 | { | |
310 | struct distribute *dist; | |
311 | struct access_list *alist; | |
312 | struct prefix_list *plist; | |
313 | int distribute = rip_distribute == RIP_FILTER_OUT ? DISTRIBUTE_V4_OUT | |
314 | : DISTRIBUTE_V4_IN; | |
315 | const char *inout = rip_distribute == RIP_FILTER_OUT ? "out" : "in"; | |
316 | ||
317 | /* Input distribute-list filtering. */ | |
318 | if (ri->list[rip_distribute] && | |
319 | access_list_apply(ri->list[rip_distribute], (struct prefix *)p) == | |
320 | FILTER_DENY) { | |
321 | if (IS_RIP_DEBUG_PACKET) | |
322 | zlog_debug("%pFX filtered by distribute %s", p, inout); | |
323 | return -1; | |
324 | } | |
325 | ||
326 | if (ri->prefix[rip_distribute] && | |
327 | prefix_list_apply(ri->prefix[rip_distribute], (struct prefix *)p) == | |
328 | PREFIX_DENY) { | |
329 | if (IS_RIP_DEBUG_PACKET) | |
330 | zlog_debug("%pFX filtered by prefix-list %s", p, inout); | |
331 | return -1; | |
332 | } | |
333 | ||
334 | /* All interface filter check. */ | |
335 | dist = distribute_lookup(ri->rip->distribute_ctx, NULL); | |
336 | if (!dist) | |
337 | return 0; | |
338 | ||
339 | if (dist->list[distribute]) { | |
340 | alist = access_list_lookup(AFI_IP, dist->list[distribute]); | |
341 | ||
342 | if (alist) { | |
343 | if (access_list_apply(alist, (struct prefix *)p) == | |
344 | FILTER_DENY) { | |
345 | if (IS_RIP_DEBUG_PACKET) | |
346 | zlog_debug( | |
347 | "%pFX filtered by distribute %s", | |
348 | p, inout); | |
349 | return -1; | |
350 | } | |
351 | } | |
352 | } | |
353 | if (dist->prefix[distribute]) { | |
354 | plist = prefix_list_lookup(AFI_IP, dist->prefix[distribute]); | |
355 | ||
356 | if (plist) { | |
357 | if (prefix_list_apply(plist, (struct prefix *)p) == | |
358 | PREFIX_DENY) { | |
359 | if (IS_RIP_DEBUG_PACKET) | |
360 | zlog_debug( | |
361 | "%pFX filtered by prefix-list %s", | |
362 | p, inout); | |
363 | return -1; | |
364 | } | |
365 | } | |
366 | } | |
367 | ||
368 | return 0; | |
369 | } | |
370 | ||
371 | /* Check nexthop address validity. */ | |
372 | static int rip_nexthop_check(struct rip *rip, struct in_addr *addr) | |
373 | { | |
374 | struct interface *ifp; | |
375 | struct listnode *cnode; | |
376 | struct connected *ifc; | |
377 | struct prefix *p; | |
378 | ||
379 | /* If nexthop address matches local configured address then it is | |
380 | invalid nexthop. */ | |
381 | ||
382 | FOR_ALL_INTERFACES (rip->vrf, ifp) { | |
383 | for (ALL_LIST_ELEMENTS_RO(ifp->connected, cnode, ifc)) { | |
384 | p = ifc->address; | |
385 | ||
386 | if (p->family == AF_INET | |
387 | && IPV4_ADDR_SAME(&p->u.prefix4, addr)) | |
388 | return -1; | |
389 | } | |
390 | } | |
391 | return 0; | |
392 | } | |
393 | ||
394 | /* RIP add route to routing table. */ | |
395 | static void rip_rte_process(struct rte *rte, struct sockaddr_in *from, | |
396 | struct interface *ifp) | |
397 | { | |
398 | struct rip *rip; | |
399 | int ret; | |
400 | struct prefix_ipv4 p; | |
401 | struct route_node *rp; | |
402 | struct rip_info *rinfo = NULL, newinfo; | |
403 | struct rip_interface *ri; | |
404 | struct in_addr *nexthop; | |
405 | int same = 0; | |
406 | unsigned char old_dist, new_dist; | |
407 | struct list *list = NULL; | |
408 | struct listnode *node = NULL; | |
409 | ||
410 | /* Make prefix structure. */ | |
411 | memset(&p, 0, sizeof(struct prefix_ipv4)); | |
412 | p.family = AF_INET; | |
413 | p.prefix = rte->prefix; | |
414 | p.prefixlen = ip_masklen(rte->mask); | |
415 | ||
416 | /* Make sure mask is applied. */ | |
417 | apply_mask_ipv4(&p); | |
418 | ||
419 | ri = ifp->info; | |
420 | rip = ri->rip; | |
421 | ||
422 | /* Apply input filters. */ | |
423 | ret = rip_filter(RIP_FILTER_IN, &p, ri); | |
424 | if (ret < 0) | |
425 | return; | |
426 | ||
427 | memset(&newinfo, 0, sizeof(newinfo)); | |
428 | newinfo.type = ZEBRA_ROUTE_RIP; | |
429 | newinfo.sub_type = RIP_ROUTE_RTE; | |
430 | newinfo.nh.gate.ipv4 = rte->nexthop; | |
431 | newinfo.from = from->sin_addr; | |
432 | newinfo.nh.ifindex = ifp->ifindex; | |
433 | newinfo.nh.type = NEXTHOP_TYPE_IPV4_IFINDEX; | |
434 | newinfo.metric = rte->metric; | |
435 | newinfo.metric_out = rte->metric; /* XXX */ | |
436 | newinfo.tag = ntohs(rte->tag); /* XXX */ | |
437 | ||
438 | /* Modify entry according to the interface routemap. */ | |
439 | if (ri->routemap[RIP_FILTER_IN]) { | |
440 | /* The object should be of the type of rip_info */ | |
441 | ret = route_map_apply(ri->routemap[RIP_FILTER_IN], | |
442 | (struct prefix *)&p, &newinfo); | |
443 | ||
444 | if (ret == RMAP_DENYMATCH) { | |
445 | if (IS_RIP_DEBUG_PACKET) | |
446 | zlog_debug( | |
447 | "RIP %pFX is filtered by route-map in", | |
448 | &p); | |
449 | return; | |
450 | } | |
451 | ||
452 | /* Get back the object */ | |
453 | rte->nexthop = newinfo.nexthop_out; | |
454 | rte->tag = htons(newinfo.tag_out); /* XXX */ | |
455 | rte->metric = newinfo.metric_out; /* XXX: the routemap uses the | |
456 | metric_out field */ | |
457 | } | |
458 | ||
459 | /* Once the entry has been validated, update the metric by | |
460 | adding the cost of the network on which the message | |
461 | arrived. If the result is greater than infinity, use infinity | |
462 | (RFC2453 Sec. 3.9.2) */ | |
463 | /* Zebra ripd can handle offset-list in. */ | |
464 | ret = rip_offset_list_apply_in(&p, ifp, &rte->metric); | |
465 | ||
466 | /* If offset-list does not modify the metric use interface's | |
467 | metric. */ | |
468 | if (!ret) | |
469 | rte->metric += ifp->metric ? ifp->metric : 1; | |
470 | ||
471 | if (rte->metric > RIP_METRIC_INFINITY) | |
472 | rte->metric = RIP_METRIC_INFINITY; | |
473 | ||
474 | /* Set nexthop pointer. */ | |
475 | if (rte->nexthop.s_addr == INADDR_ANY) | |
476 | nexthop = &from->sin_addr; | |
477 | else | |
478 | nexthop = &rte->nexthop; | |
479 | ||
480 | /* Check if nexthop address is myself, then do nothing. */ | |
481 | if (rip_nexthop_check(rip, nexthop) < 0) { | |
482 | if (IS_RIP_DEBUG_PACKET) | |
483 | zlog_debug("Nexthop address %pI4 is myself", | |
484 | nexthop); | |
485 | return; | |
486 | } | |
487 | ||
488 | /* Get index for the prefix. */ | |
489 | rp = route_node_get(rip->table, (struct prefix *)&p); | |
490 | ||
491 | newinfo.rp = rp; | |
492 | newinfo.nh.gate.ipv4 = *nexthop; | |
493 | newinfo.nh.type = NEXTHOP_TYPE_IPV4; | |
494 | newinfo.metric = rte->metric; | |
495 | newinfo.tag = ntohs(rte->tag); | |
496 | newinfo.distance = rip_distance_apply(rip, &newinfo); | |
497 | ||
498 | new_dist = newinfo.distance ? newinfo.distance | |
499 | : ZEBRA_RIP_DISTANCE_DEFAULT; | |
500 | ||
501 | /* Check to see whether there is already RIP route on the table. */ | |
502 | if ((list = rp->info) != NULL) | |
503 | for (ALL_LIST_ELEMENTS_RO(list, node, rinfo)) { | |
504 | /* Need to compare with redistributed entry or local | |
505 | * entry */ | |
506 | if (!rip_route_rte(rinfo)) | |
507 | break; | |
508 | ||
509 | if (IPV4_ADDR_SAME(&rinfo->from, &from->sin_addr) | |
510 | && IPV4_ADDR_SAME(&rinfo->nh.gate.ipv4, nexthop)) | |
511 | break; | |
512 | ||
513 | if (listnextnode(node)) | |
514 | continue; | |
515 | ||
516 | /* Not found in the list */ | |
517 | ||
518 | if (rte->metric > rinfo->metric) { | |
519 | /* New route has a greater metric. | |
520 | * Discard it. */ | |
521 | route_unlock_node(rp); | |
522 | return; | |
523 | } | |
524 | ||
525 | if (rte->metric < rinfo->metric) | |
526 | /* New route has a smaller metric. | |
527 | * Replace the ECMP list | |
528 | * with the new one in below. */ | |
529 | break; | |
530 | ||
531 | /* Metrics are same. We compare the distances. | |
532 | */ | |
533 | old_dist = rinfo->distance ? rinfo->distance | |
534 | : ZEBRA_RIP_DISTANCE_DEFAULT; | |
535 | ||
536 | if (new_dist > old_dist) { | |
537 | /* New route has a greater distance. | |
538 | * Discard it. */ | |
539 | route_unlock_node(rp); | |
540 | return; | |
541 | } | |
542 | ||
543 | if (new_dist < old_dist) | |
544 | /* New route has a smaller distance. | |
545 | * Replace the ECMP list | |
546 | * with the new one in below. */ | |
547 | break; | |
548 | ||
549 | /* Metrics and distances are both same. Keep | |
550 | * "rinfo" null and | |
551 | * the new route is added in the ECMP list in | |
552 | * below. */ | |
553 | } | |
554 | ||
555 | if (rinfo) { | |
556 | /* Local static route. */ | |
557 | if (rinfo->type == ZEBRA_ROUTE_RIP | |
558 | && ((rinfo->sub_type == RIP_ROUTE_STATIC) | |
559 | || (rinfo->sub_type == RIP_ROUTE_DEFAULT)) | |
560 | && rinfo->metric != RIP_METRIC_INFINITY) { | |
561 | route_unlock_node(rp); | |
562 | return; | |
563 | } | |
564 | ||
565 | /* Redistributed route check. */ | |
566 | if (rinfo->type != ZEBRA_ROUTE_RIP | |
567 | && rinfo->metric != RIP_METRIC_INFINITY) { | |
568 | old_dist = rinfo->distance; | |
569 | /* Only routes directly connected to an interface | |
570 | * (nexthop == 0) | |
571 | * may have a valid NULL distance */ | |
572 | if (rinfo->nh.gate.ipv4.s_addr != INADDR_ANY) | |
573 | old_dist = old_dist | |
574 | ? old_dist | |
575 | : ZEBRA_RIP_DISTANCE_DEFAULT; | |
576 | /* If imported route does not have STRICT precedence, | |
577 | mark it as a ghost */ | |
578 | if (new_dist <= old_dist | |
579 | && rte->metric != RIP_METRIC_INFINITY) | |
580 | rip_ecmp_replace(rip, &newinfo); | |
581 | ||
582 | route_unlock_node(rp); | |
583 | return; | |
584 | } | |
585 | } | |
586 | ||
587 | if (!rinfo) { | |
588 | if (rp->info) | |
589 | route_unlock_node(rp); | |
590 | ||
591 | /* Now, check to see whether there is already an explicit route | |
592 | for the destination prefix. If there is no such route, add | |
593 | this route to the routing table, unless the metric is | |
594 | infinity (there is no point in adding a route which | |
595 | unusable). */ | |
596 | if (rte->metric != RIP_METRIC_INFINITY) | |
597 | rip_ecmp_add(rip, &newinfo); | |
598 | } else { | |
599 | /* Route is there but we are not sure the route is RIP or not. | |
600 | */ | |
601 | ||
602 | /* If there is an existing route, compare the next hop address | |
603 | to the address of the router from which the datagram came. | |
604 | If this datagram is from the same router as the existing | |
605 | route, reinitialize the timeout. */ | |
606 | same = (IPV4_ADDR_SAME(&rinfo->from, &from->sin_addr) | |
607 | && (rinfo->nh.ifindex == ifp->ifindex)); | |
608 | ||
609 | old_dist = rinfo->distance ? rinfo->distance | |
610 | : ZEBRA_RIP_DISTANCE_DEFAULT; | |
611 | ||
612 | /* Next, compare the metrics. If the datagram is from the same | |
613 | router as the existing route, and the new metric is different | |
614 | than the old one; or, if the new metric is lower than the old | |
615 | one, or if the tag has been changed; or if there is a route | |
616 | with a lower administrave distance; or an update of the | |
617 | distance on the actual route; do the following actions: */ | |
618 | if ((same && rinfo->metric != rte->metric) | |
619 | || (rte->metric < rinfo->metric) | |
620 | || ((same) && (rinfo->metric == rte->metric) | |
621 | && (newinfo.tag != rinfo->tag)) | |
622 | || (old_dist > new_dist) | |
623 | || ((old_dist != new_dist) && same)) { | |
624 | if (listcount(list) == 1) { | |
625 | if (newinfo.metric != RIP_METRIC_INFINITY) | |
626 | rip_ecmp_replace(rip, &newinfo); | |
627 | else | |
628 | rip_ecmp_delete(rip, rinfo); | |
629 | } else { | |
630 | if (newinfo.metric < rinfo->metric) | |
631 | rip_ecmp_replace(rip, &newinfo); | |
632 | else if (newinfo.metric > rinfo->metric) | |
633 | rip_ecmp_delete(rip, rinfo); | |
634 | else if (new_dist < old_dist) | |
635 | rip_ecmp_replace(rip, &newinfo); | |
636 | else if (new_dist > old_dist) | |
637 | rip_ecmp_delete(rip, rinfo); | |
638 | else { | |
639 | int update = CHECK_FLAG(rinfo->flags, | |
640 | RIP_RTF_FIB) | |
641 | ? 1 | |
642 | : 0; | |
643 | ||
644 | assert(newinfo.metric | |
645 | != RIP_METRIC_INFINITY); | |
646 | ||
647 | EVENT_OFF(rinfo->t_timeout); | |
648 | EVENT_OFF(rinfo->t_garbage_collect); | |
649 | memcpy(rinfo, &newinfo, | |
650 | sizeof(struct rip_info)); | |
651 | rip_timeout_update(rip, rinfo); | |
652 | ||
653 | if (update) | |
654 | rip_zebra_ipv4_add(rip, rp); | |
655 | ||
656 | /* - Set the route change flag on the | |
657 | * first entry. */ | |
658 | rinfo = listgetdata(listhead(list)); | |
659 | SET_FLAG(rinfo->flags, RIP_RTF_CHANGED); | |
660 | rip_event(rip, RIP_TRIGGERED_UPDATE, 0); | |
661 | } | |
662 | } | |
663 | } else /* same & no change */ | |
664 | rip_timeout_update(rip, rinfo); | |
665 | ||
666 | /* Unlock tempolary lock of the route. */ | |
667 | route_unlock_node(rp); | |
668 | } | |
669 | } | |
670 | ||
671 | /* Dump RIP packet */ | |
672 | static void rip_packet_dump(struct rip_packet *packet, int size, | |
673 | const char *sndrcv) | |
674 | { | |
675 | caddr_t lim; | |
676 | struct rte *rte; | |
677 | const char *command_str; | |
678 | uint8_t netmask = 0; | |
679 | uint8_t *p; | |
680 | ||
681 | /* Set command string. */ | |
682 | if (packet->command > 0 && packet->command < RIP_COMMAND_MAX) | |
683 | command_str = lookup_msg(rip_msg, packet->command, NULL); | |
684 | else | |
685 | command_str = "unknown"; | |
686 | ||
687 | /* Dump packet header. */ | |
688 | zlog_debug("%s %s version %d packet size %d", sndrcv, command_str, | |
689 | packet->version, size); | |
690 | ||
691 | /* Dump each routing table entry. */ | |
692 | rte = packet->rte; | |
693 | ||
694 | for (lim = (caddr_t)packet + size; (caddr_t)rte < lim; rte++) { | |
695 | if (packet->version == RIPv2) { | |
696 | netmask = ip_masklen(rte->mask); | |
697 | ||
698 | if (rte->family == htons(RIP_FAMILY_AUTH)) { | |
699 | if (rte->tag | |
700 | == htons(RIP_AUTH_SIMPLE_PASSWORD)) { | |
701 | p = (uint8_t *)&rte->prefix; | |
702 | ||
703 | zlog_debug( | |
704 | " family 0x%X type %d auth string: %s", | |
705 | ntohs(rte->family), | |
706 | ntohs(rte->tag), p); | |
707 | } else if (rte->tag == htons(RIP_AUTH_MD5)) { | |
708 | struct rip_md5_info *md5; | |
709 | ||
710 | md5 = (struct rip_md5_info *)&packet | |
711 | ->rte; | |
712 | ||
713 | zlog_debug( | |
714 | " family 0x%X type %d (MD5 authentication)", | |
715 | ntohs(md5->family), | |
716 | ntohs(md5->type)); | |
717 | zlog_debug( | |
718 | " RIP-2 packet len %d Key ID %d Auth Data len %d", | |
719 | ntohs(md5->packet_len), | |
720 | md5->keyid, md5->auth_len); | |
721 | zlog_debug(" Sequence Number %ld", | |
722 | (unsigned long)ntohl( | |
723 | md5->sequence)); | |
724 | } else if (rte->tag == htons(RIP_AUTH_DATA)) { | |
725 | p = (uint8_t *)&rte->prefix; | |
726 | ||
727 | zlog_debug( | |
728 | " family 0x%X type %d (MD5 data)", | |
729 | ntohs(rte->family), | |
730 | ntohs(rte->tag)); | |
731 | zlog_debug( | |
732 | " MD5: %02X%02X%02X%02X%02X%02X%02X%02X%02X%02X%02X%02X%02X%02X%02X%02X", | |
733 | p[0], p[1], p[2], p[3], p[4], | |
734 | p[5], p[6], p[7], p[8], p[9], | |
735 | p[10], p[11], p[12], p[13], | |
736 | p[14], p[15]); | |
737 | } else { | |
738 | zlog_debug( | |
739 | " family 0x%X type %d (Unknown auth type)", | |
740 | ntohs(rte->family), | |
741 | ntohs(rte->tag)); | |
742 | } | |
743 | } else | |
744 | zlog_debug( | |
745 | " %pI4/%d -> %pI4 family %d tag %" ROUTE_TAG_PRI | |
746 | " metric %ld", | |
747 | &rte->prefix, netmask, &rte->nexthop, | |
748 | ntohs(rte->family), | |
749 | (route_tag_t)ntohs(rte->tag), | |
750 | (unsigned long)ntohl(rte->metric)); | |
751 | } else { | |
752 | zlog_debug(" %pI4 family %d tag %" ROUTE_TAG_PRI | |
753 | " metric %ld", | |
754 | &rte->prefix, ntohs(rte->family), | |
755 | (route_tag_t)ntohs(rte->tag), | |
756 | (unsigned long)ntohl(rte->metric)); | |
757 | } | |
758 | } | |
759 | } | |
760 | ||
761 | /* Check if the destination address is valid (unicast; not net 0 | |
762 | or 127) (RFC2453 Section 3.9.2 - Page 26). But we don't | |
763 | check net 0 because we accept default route. */ | |
764 | static int rip_destination_check(struct in_addr addr) | |
765 | { | |
766 | uint32_t destination; | |
767 | ||
768 | /* Convert to host byte order. */ | |
769 | destination = ntohl(addr.s_addr); | |
770 | ||
771 | if (IPV4_NET127(destination)) | |
772 | return 0; | |
773 | ||
774 | /* Net 0 may match to the default route. */ | |
775 | if (IPV4_NET0(destination) && destination != 0) | |
776 | return 0; | |
777 | ||
778 | /* Unicast address must belong to class A, B, C. */ | |
779 | if (IN_CLASSA(destination)) | |
780 | return 1; | |
781 | if (IN_CLASSB(destination)) | |
782 | return 1; | |
783 | if (IN_CLASSC(destination)) | |
784 | return 1; | |
785 | ||
786 | return 0; | |
787 | } | |
788 | ||
789 | /* RIP version 2 authentication. */ | |
790 | static int rip_auth_simple_password(struct rte *rte, struct sockaddr_in *from, | |
791 | struct interface *ifp) | |
792 | { | |
793 | struct rip_interface *ri; | |
794 | char *auth_str = (char *)rte + offsetof(struct rte, prefix); | |
795 | int i; | |
796 | ||
797 | /* reject passwords with zeros in the middle of the string */ | |
798 | for (i = strnlen(auth_str, 16); i < 16; i++) { | |
799 | if (auth_str[i] != '\0') | |
800 | return 0; | |
801 | } | |
802 | ||
803 | if (IS_RIP_DEBUG_EVENT) | |
804 | zlog_debug("RIPv2 simple password authentication from %pI4", | |
805 | &from->sin_addr); | |
806 | ||
807 | ri = ifp->info; | |
808 | ||
809 | if (ri->auth_type != RIP_AUTH_SIMPLE_PASSWORD | |
810 | || rte->tag != htons(RIP_AUTH_SIMPLE_PASSWORD)) | |
811 | return 0; | |
812 | ||
813 | /* Simple password authentication. */ | |
814 | if (ri->auth_str) { | |
815 | if (strncmp(auth_str, ri->auth_str, 16) == 0) | |
816 | return 1; | |
817 | } | |
818 | if (ri->key_chain) { | |
819 | struct keychain *keychain; | |
820 | struct key *key; | |
821 | ||
822 | keychain = keychain_lookup(ri->key_chain); | |
823 | if (keychain == NULL || keychain->key == NULL) | |
824 | return 0; | |
825 | ||
826 | key = key_match_for_accept(keychain, auth_str); | |
827 | if (key) | |
828 | return 1; | |
829 | } | |
830 | return 0; | |
831 | } | |
832 | ||
833 | /* RIP version 2 authentication with MD5. */ | |
834 | static int rip_auth_md5(struct rip_packet *packet, struct sockaddr_in *from, | |
835 | int length, struct interface *ifp) | |
836 | { | |
837 | struct rip_interface *ri; | |
838 | struct rip_md5_info *md5; | |
839 | struct rip_md5_data *md5data; | |
840 | struct keychain *keychain; | |
841 | struct key *key; | |
842 | #ifdef CRYPTO_OPENSSL | |
843 | EVP_MD_CTX *ctx; | |
844 | #elif CRYPTO_INTERNAL | |
845 | MD5_CTX ctx; | |
846 | #endif | |
847 | uint8_t digest[RIP_AUTH_MD5_SIZE]; | |
848 | uint16_t packet_len; | |
849 | char auth_str[RIP_AUTH_MD5_SIZE] = {}; | |
850 | ||
851 | if (IS_RIP_DEBUG_EVENT) | |
852 | zlog_debug("RIPv2 MD5 authentication from %pI4", | |
853 | &from->sin_addr); | |
854 | ||
855 | ri = ifp->info; | |
856 | md5 = (struct rip_md5_info *)&packet->rte; | |
857 | ||
858 | /* Check auth type. */ | |
859 | if (ri->auth_type != RIP_AUTH_MD5 || md5->type != htons(RIP_AUTH_MD5)) | |
860 | return 0; | |
861 | ||
862 | /* If the authentication length is less than 16, then it must be wrong | |
863 | * for | |
864 | * any interpretation of rfc2082. Some implementations also interpret | |
865 | * this as RIP_HEADER_SIZE+ RIP_AUTH_MD5_SIZE, aka | |
866 | * RIP_AUTH_MD5_COMPAT_SIZE. | |
867 | */ | |
868 | if (!((md5->auth_len == RIP_AUTH_MD5_SIZE) | |
869 | || (md5->auth_len == RIP_AUTH_MD5_COMPAT_SIZE))) { | |
870 | if (IS_RIP_DEBUG_EVENT) | |
871 | zlog_debug( | |
872 | "RIPv2 MD5 authentication, strange authentication length field %d", | |
873 | md5->auth_len); | |
874 | return 0; | |
875 | } | |
876 | ||
877 | /* grab and verify check packet length */ | |
878 | packet_len = ntohs(md5->packet_len); | |
879 | ||
880 | if (packet_len > (length - RIP_HEADER_SIZE - RIP_AUTH_MD5_SIZE)) { | |
881 | if (IS_RIP_DEBUG_EVENT) | |
882 | zlog_debug( | |
883 | "RIPv2 MD5 authentication, packet length field %d greater than received length %d!", | |
884 | md5->packet_len, length); | |
885 | return 0; | |
886 | } | |
887 | ||
888 | /* retrieve authentication data */ | |
889 | md5data = (struct rip_md5_data *)(((uint8_t *)packet) + packet_len); | |
890 | ||
891 | if (ri->key_chain) { | |
892 | keychain = keychain_lookup(ri->key_chain); | |
893 | if (keychain == NULL) | |
894 | return 0; | |
895 | ||
896 | key = key_lookup_for_accept(keychain, md5->keyid); | |
897 | if (key == NULL || key->string == NULL) | |
898 | return 0; | |
899 | ||
900 | memcpy(auth_str, key->string, | |
901 | MIN(sizeof(auth_str), strlen(key->string))); | |
902 | } else if (ri->auth_str) | |
903 | memcpy(auth_str, ri->auth_str, | |
904 | MIN(sizeof(auth_str), strlen(ri->auth_str))); | |
905 | ||
906 | if (auth_str[0] == 0) | |
907 | return 0; | |
908 | ||
909 | /* MD5 digest authentication. */ | |
910 | #ifdef CRYPTO_OPENSSL | |
911 | unsigned int md5_size = RIP_AUTH_MD5_SIZE; | |
912 | ctx = EVP_MD_CTX_new(); | |
913 | EVP_DigestInit(ctx, EVP_md5()); | |
914 | EVP_DigestUpdate(ctx, packet, packet_len + RIP_HEADER_SIZE); | |
915 | EVP_DigestUpdate(ctx, auth_str, RIP_AUTH_MD5_SIZE); | |
916 | EVP_DigestFinal(ctx, digest, &md5_size); | |
917 | EVP_MD_CTX_free(ctx); | |
918 | #elif CRYPTO_INTERNAL | |
919 | memset(&ctx, 0, sizeof(ctx)); | |
920 | MD5Init(&ctx); | |
921 | MD5Update(&ctx, packet, packet_len + RIP_HEADER_SIZE); | |
922 | MD5Update(&ctx, auth_str, RIP_AUTH_MD5_SIZE); | |
923 | MD5Final(digest, &ctx); | |
924 | #endif | |
925 | ||
926 | if (memcmp(md5data->digest, digest, RIP_AUTH_MD5_SIZE) == 0) | |
927 | return packet_len; | |
928 | else | |
929 | return 0; | |
930 | } | |
931 | ||
932 | /* Pick correct auth string for sends, prepare auth_str buffer for use. | |
933 | * (left justified and padded). | |
934 | * | |
935 | * presumes one of ri or key is valid, and that the auth strings they point | |
936 | * to are nul terminated. If neither are present, auth_str will be fully | |
937 | * zero padded. | |
938 | * | |
939 | */ | |
940 | static void rip_auth_prepare_str_send(struct rip_interface *ri, struct key *key, | |
941 | char *auth_str, int len) | |
942 | { | |
943 | assert(ri || key); | |
944 | ||
945 | memset(auth_str, 0, len); | |
946 | if (key && key->string) | |
947 | memcpy(auth_str, key->string, | |
948 | MIN((size_t)len, strlen(key->string))); | |
949 | else if (ri->auth_str) | |
950 | memcpy(auth_str, ri->auth_str, | |
951 | MIN((size_t)len, strlen(ri->auth_str))); | |
952 | ||
953 | return; | |
954 | } | |
955 | ||
956 | /* Write RIPv2 simple password authentication information | |
957 | * | |
958 | * auth_str is presumed to be 2 bytes and correctly prepared | |
959 | * (left justified and zero padded). | |
960 | */ | |
961 | static void rip_auth_simple_write(struct stream *s, char *auth_str, int len) | |
962 | { | |
963 | assert(s && len == RIP_AUTH_SIMPLE_SIZE); | |
964 | ||
965 | stream_putw(s, RIP_FAMILY_AUTH); | |
966 | stream_putw(s, RIP_AUTH_SIMPLE_PASSWORD); | |
967 | stream_put(s, auth_str, RIP_AUTH_SIMPLE_SIZE); | |
968 | ||
969 | return; | |
970 | } | |
971 | ||
972 | /* write RIPv2 MD5 "authentication header" | |
973 | * (uses the auth key data field) | |
974 | * | |
975 | * Digest offset field is set to 0. | |
976 | * | |
977 | * returns: offset of the digest offset field, which must be set when | |
978 | * length to the auth-data MD5 digest is known. | |
979 | */ | |
980 | static size_t rip_auth_md5_ah_write(struct stream *s, struct rip_interface *ri, | |
981 | struct key *key) | |
982 | { | |
983 | size_t doff = 0; | |
984 | static uint32_t seq = 0; | |
985 | ||
986 | assert(s && ri && ri->auth_type == RIP_AUTH_MD5); | |
987 | ||
988 | /* MD5 authentication. */ | |
989 | stream_putw(s, RIP_FAMILY_AUTH); | |
990 | stream_putw(s, RIP_AUTH_MD5); | |
991 | ||
992 | /* MD5 AH digest offset field. | |
993 | * | |
994 | * Set to placeholder value here, to true value when RIP-2 Packet length | |
995 | * is known. Actual value is set in .....(). | |
996 | */ | |
997 | doff = stream_get_endp(s); | |
998 | stream_putw(s, 0); | |
999 | ||
1000 | /* Key ID. */ | |
1001 | if (key) | |
1002 | stream_putc(s, key->index % 256); | |
1003 | else | |
1004 | stream_putc(s, 1); | |
1005 | ||
1006 | /* Auth Data Len. Set 16 for MD5 authentication data. Older ripds | |
1007 | * however expect RIP_HEADER_SIZE + RIP_AUTH_MD5_SIZE so we allow for | |
1008 | * this | |
1009 | * to be configurable. | |
1010 | */ | |
1011 | stream_putc(s, ri->md5_auth_len); | |
1012 | ||
1013 | /* Sequence Number (non-decreasing). */ | |
1014 | /* RFC2080: The value used in the sequence number is | |
1015 | arbitrary, but two suggestions are the time of the | |
1016 | message's creation or a simple message counter. */ | |
1017 | stream_putl(s, ++seq); | |
1018 | ||
1019 | /* Reserved field must be zero. */ | |
1020 | stream_putl(s, 0); | |
1021 | stream_putl(s, 0); | |
1022 | ||
1023 | return doff; | |
1024 | } | |
1025 | ||
1026 | /* If authentication is in used, write the appropriate header | |
1027 | * returns stream offset to which length must later be written | |
1028 | * or 0 if this is not required | |
1029 | */ | |
1030 | static size_t rip_auth_header_write(struct stream *s, struct rip_interface *ri, | |
1031 | struct key *key, char *auth_str, int len) | |
1032 | { | |
1033 | assert(ri->auth_type != RIP_NO_AUTH); | |
1034 | ||
1035 | switch (ri->auth_type) { | |
1036 | case RIP_AUTH_SIMPLE_PASSWORD: | |
1037 | rip_auth_prepare_str_send(ri, key, auth_str, len); | |
1038 | rip_auth_simple_write(s, auth_str, len); | |
1039 | return 0; | |
1040 | case RIP_AUTH_MD5: | |
1041 | return rip_auth_md5_ah_write(s, ri, key); | |
1042 | } | |
1043 | assert(1); | |
1044 | return 0; | |
1045 | } | |
1046 | ||
1047 | /* Write RIPv2 MD5 authentication data trailer */ | |
1048 | static void rip_auth_md5_set(struct stream *s, struct rip_interface *ri, | |
1049 | size_t doff, char *auth_str, int authlen) | |
1050 | { | |
1051 | unsigned long len; | |
1052 | #ifdef CRYPTO_OPENSSL | |
1053 | EVP_MD_CTX *ctx; | |
1054 | #elif CRYPTO_INTERNAL | |
1055 | MD5_CTX ctx; | |
1056 | #endif | |
1057 | unsigned char digest[RIP_AUTH_MD5_SIZE]; | |
1058 | ||
1059 | /* Make it sure this interface is configured as MD5 | |
1060 | authentication. */ | |
1061 | assert((ri->auth_type == RIP_AUTH_MD5) | |
1062 | && (authlen == RIP_AUTH_MD5_SIZE)); | |
1063 | assert(doff > 0); | |
1064 | ||
1065 | /* Get packet length. */ | |
1066 | len = stream_get_endp(s); | |
1067 | ||
1068 | /* Check packet length. */ | |
1069 | if (len < (RIP_HEADER_SIZE + RIP_RTE_SIZE)) { | |
1070 | flog_err(EC_RIP_PACKET, | |
1071 | "%s: packet length %ld is less than minimum length.", | |
1072 | __func__, len); | |
1073 | return; | |
1074 | } | |
1075 | ||
1076 | /* Set the digest offset length in the header */ | |
1077 | stream_putw_at(s, doff, len); | |
1078 | ||
1079 | /* Set authentication data. */ | |
1080 | stream_putw(s, RIP_FAMILY_AUTH); | |
1081 | stream_putw(s, RIP_AUTH_DATA); | |
1082 | ||
1083 | /* Generate a digest for the RIP packet. */ | |
1084 | #ifdef CRYPTO_OPENSSL | |
1085 | unsigned int md5_size = RIP_AUTH_MD5_SIZE; | |
1086 | ctx = EVP_MD_CTX_new(); | |
1087 | EVP_DigestInit(ctx, EVP_md5()); | |
1088 | EVP_DigestUpdate(ctx, STREAM_DATA(s), stream_get_endp(s)); | |
1089 | EVP_DigestUpdate(ctx, auth_str, RIP_AUTH_MD5_SIZE); | |
1090 | EVP_DigestFinal(ctx, digest, &md5_size); | |
1091 | EVP_MD_CTX_free(ctx); | |
1092 | #elif CRYPTO_INTERNAL | |
1093 | memset(&ctx, 0, sizeof(ctx)); | |
1094 | MD5Init(&ctx); | |
1095 | MD5Update(&ctx, STREAM_DATA(s), stream_get_endp(s)); | |
1096 | MD5Update(&ctx, auth_str, RIP_AUTH_MD5_SIZE); | |
1097 | MD5Final(digest, &ctx); | |
1098 | #endif | |
1099 | ||
1100 | /* Copy the digest to the packet. */ | |
1101 | stream_write(s, digest, RIP_AUTH_MD5_SIZE); | |
1102 | } | |
1103 | ||
1104 | /* RIP routing information. */ | |
1105 | static void rip_response_process(struct rip_packet *packet, int size, | |
1106 | struct sockaddr_in *from, | |
1107 | struct connected *ifc) | |
1108 | { | |
1109 | struct rip_interface *ri = ifc->ifp->info; | |
1110 | struct rip *rip = ri->rip; | |
1111 | caddr_t lim; | |
1112 | struct rte *rte; | |
1113 | struct prefix_ipv4 ifaddr; | |
1114 | struct prefix_ipv4 ifaddrclass; | |
1115 | int subnetted; | |
1116 | ||
1117 | memset(&ifaddr, 0, sizeof(ifaddr)); | |
1118 | /* We don't know yet. */ | |
1119 | subnetted = -1; | |
1120 | ||
1121 | /* The Response must be ignored if it is not from the RIP | |
1122 | port. (RFC2453 - Sec. 3.9.2)*/ | |
1123 | if (from->sin_port != htons(RIP_PORT_DEFAULT)) { | |
1124 | zlog_info("response doesn't come from RIP port: %d", | |
1125 | from->sin_port); | |
1126 | rip_peer_bad_packet(rip, from); | |
1127 | return; | |
1128 | } | |
1129 | ||
1130 | /* The datagram's IPv4 source address should be checked to see | |
1131 | whether the datagram is from a valid neighbor; the source of the | |
1132 | datagram must be on a directly connected network (RFC2453 - Sec. | |
1133 | 3.9.2) */ | |
1134 | if (if_lookup_address((void *)&from->sin_addr, AF_INET, | |
1135 | rip->vrf->vrf_id) | |
1136 | == NULL) { | |
1137 | zlog_info( | |
1138 | "This datagram doesn't come from a valid neighbor: %pI4", | |
1139 | &from->sin_addr); | |
1140 | rip_peer_bad_packet(rip, from); | |
1141 | return; | |
1142 | } | |
1143 | ||
1144 | /* It is also worth checking to see whether the response is from one | |
1145 | of the router's own addresses. */ | |
1146 | ||
1147 | ; /* Alredy done in rip_read () */ | |
1148 | ||
1149 | /* Update RIP peer. */ | |
1150 | rip_peer_update(rip, from, packet->version); | |
1151 | ||
1152 | /* Set RTE pointer. */ | |
1153 | rte = packet->rte; | |
1154 | ||
1155 | for (lim = (caddr_t)packet + size; (caddr_t)rte < lim; rte++) { | |
1156 | /* RIPv2 authentication check. */ | |
1157 | /* If the Address Family Identifier of the first (and only the | |
1158 | first) entry in the message is 0xFFFF, then the remainder of | |
1159 | the entry contains the authentication. */ | |
1160 | /* If the packet gets here it means authentication enabled */ | |
1161 | /* Check is done in rip_read(). So, just skipping it */ | |
1162 | if (packet->version == RIPv2 && rte == packet->rte | |
1163 | && rte->family == htons(RIP_FAMILY_AUTH)) | |
1164 | continue; | |
1165 | ||
1166 | if (rte->family != htons(AF_INET)) { | |
1167 | /* Address family check. RIP only supports AF_INET. */ | |
1168 | zlog_info("Unsupported family %d from %pI4", | |
1169 | ntohs(rte->family), | |
1170 | &from->sin_addr); | |
1171 | continue; | |
1172 | } | |
1173 | ||
1174 | /* - is the destination address valid (e.g., unicast; not net 0 | |
1175 | or 127) */ | |
1176 | if (!rip_destination_check(rte->prefix)) { | |
1177 | zlog_info( | |
1178 | "Network is net 0 or net 127 or it is not unicast network"); | |
1179 | rip_peer_bad_route(rip, from); | |
1180 | continue; | |
1181 | } | |
1182 | ||
1183 | /* Convert metric value to host byte order. */ | |
1184 | rte->metric = ntohl(rte->metric); | |
1185 | ||
1186 | /* - is the metric valid (i.e., between 1 and 16, inclusive) */ | |
1187 | if (!(rte->metric >= 1 && rte->metric <= 16)) { | |
1188 | zlog_info("Route's metric is not in the 1-16 range."); | |
1189 | rip_peer_bad_route(rip, from); | |
1190 | continue; | |
1191 | } | |
1192 | ||
1193 | /* RIPv1 does not have nexthop value. */ | |
1194 | if (packet->version == RIPv1 | |
1195 | && rte->nexthop.s_addr != INADDR_ANY) { | |
1196 | zlog_info("RIPv1 packet with nexthop value %pI4", | |
1197 | &rte->nexthop); | |
1198 | rip_peer_bad_route(rip, from); | |
1199 | continue; | |
1200 | } | |
1201 | ||
1202 | /* That is, if the provided information is ignored, a possibly | |
1203 | sub-optimal, but absolutely valid, route may be taken. If | |
1204 | the received Next Hop is not directly reachable, it should be | |
1205 | treated as 0.0.0.0. */ | |
1206 | if (packet->version == RIPv2 | |
1207 | && rte->nexthop.s_addr != INADDR_ANY) { | |
1208 | uint32_t addrval; | |
1209 | ||
1210 | /* Multicast address check. */ | |
1211 | addrval = ntohl(rte->nexthop.s_addr); | |
1212 | if (IN_CLASSD(addrval)) { | |
1213 | zlog_info( | |
1214 | "Nexthop %pI4 is multicast address, skip this rte", | |
1215 | &rte->nexthop); | |
1216 | continue; | |
1217 | } | |
1218 | ||
1219 | if (!if_lookup_address((void *)&rte->nexthop, AF_INET, | |
1220 | rip->vrf->vrf_id)) { | |
1221 | struct route_node *rn; | |
1222 | struct rip_info *rinfo; | |
1223 | ||
1224 | rn = route_node_match_ipv4(rip->table, | |
1225 | &rte->nexthop); | |
1226 | ||
1227 | if (rn) { | |
1228 | rinfo = rn->info; | |
1229 | ||
1230 | if (rinfo->type == ZEBRA_ROUTE_RIP | |
1231 | && rinfo->sub_type | |
1232 | == RIP_ROUTE_RTE) { | |
1233 | if (IS_RIP_DEBUG_EVENT) | |
1234 | zlog_debug( | |
1235 | "Next hop %pI4 is on RIP network. Set nexthop to the packet's originator", | |
1236 | &rte->nexthop); | |
1237 | rte->nexthop = rinfo->from; | |
1238 | } else { | |
1239 | if (IS_RIP_DEBUG_EVENT) | |
1240 | zlog_debug( | |
1241 | "Next hop %pI4 is not directly reachable. Treat it as 0.0.0.0", | |
1242 | &rte->nexthop); | |
1243 | rte->nexthop.s_addr = | |
1244 | INADDR_ANY; | |
1245 | } | |
1246 | ||
1247 | route_unlock_node(rn); | |
1248 | } else { | |
1249 | if (IS_RIP_DEBUG_EVENT) | |
1250 | zlog_debug( | |
1251 | "Next hop %pI4 is not directly reachable. Treat it as 0.0.0.0", | |
1252 | &rte->nexthop); | |
1253 | rte->nexthop.s_addr = INADDR_ANY; | |
1254 | } | |
1255 | } | |
1256 | } | |
1257 | ||
1258 | /* For RIPv1, there won't be a valid netmask. | |
1259 | * This is a best guess at the masks. If everyone was using old | |
1260 | * Ciscos before the 'ip subnet zero' option, it would be almost | |
1261 | * right too :-) | |
1262 | * | |
1263 | * Cisco summarize ripv1 advertisements to the classful boundary | |
1264 | * (/16 for class B's) except when the RIP packet does to inside | |
1265 | * the classful network in question. | |
1266 | */ | |
1267 | if ((packet->version == RIPv1 | |
1268 | && rte->prefix.s_addr != INADDR_ANY) | |
1269 | || (packet->version == RIPv2 | |
1270 | && (rte->prefix.s_addr != INADDR_ANY | |
1271 | && rte->mask.s_addr == INADDR_ANY))) { | |
1272 | uint32_t destination; | |
1273 | ||
1274 | if (subnetted == -1) { | |
1275 | memcpy(&ifaddr, ifc->address, sizeof(ifaddr)); | |
1276 | memcpy(&ifaddrclass, &ifaddr, | |
1277 | sizeof(ifaddrclass)); | |
1278 | apply_classful_mask_ipv4(&ifaddrclass); | |
1279 | subnetted = 0; | |
1280 | if (ifaddr.prefixlen > ifaddrclass.prefixlen) | |
1281 | subnetted = 1; | |
1282 | } | |
1283 | ||
1284 | destination = ntohl(rte->prefix.s_addr); | |
1285 | ||
1286 | if (IN_CLASSA(destination)) | |
1287 | masklen2ip(8, &rte->mask); | |
1288 | else if (IN_CLASSB(destination)) | |
1289 | masklen2ip(16, &rte->mask); | |
1290 | else if (IN_CLASSC(destination)) | |
1291 | masklen2ip(24, &rte->mask); | |
1292 | ||
1293 | if (subnetted == 1) | |
1294 | masklen2ip(ifaddrclass.prefixlen, | |
1295 | (struct in_addr *)&destination); | |
1296 | if ((subnetted == 1) | |
1297 | && ((rte->prefix.s_addr & destination) | |
1298 | == ifaddrclass.prefix.s_addr)) { | |
1299 | masklen2ip(ifaddr.prefixlen, &rte->mask); | |
1300 | if ((rte->prefix.s_addr & rte->mask.s_addr) | |
1301 | != rte->prefix.s_addr) | |
1302 | masklen2ip(32, &rte->mask); | |
1303 | if (IS_RIP_DEBUG_EVENT) | |
1304 | zlog_debug("Subnetted route %pI4", | |
1305 | &rte->prefix); | |
1306 | } else { | |
1307 | if ((rte->prefix.s_addr & rte->mask.s_addr) | |
1308 | != rte->prefix.s_addr) | |
1309 | continue; | |
1310 | } | |
1311 | ||
1312 | if (IS_RIP_DEBUG_EVENT) { | |
1313 | zlog_debug("Resultant route %pI4", | |
1314 | &rte->prefix); | |
1315 | zlog_debug("Resultant mask %pI4", | |
1316 | &rte->mask); | |
1317 | } | |
1318 | } | |
1319 | ||
1320 | /* In case of RIPv2, if prefix in RTE is not netmask applied one | |
1321 | ignore the entry. */ | |
1322 | if ((packet->version == RIPv2) | |
1323 | && (rte->mask.s_addr != INADDR_ANY) | |
1324 | && ((rte->prefix.s_addr & rte->mask.s_addr) | |
1325 | != rte->prefix.s_addr)) { | |
1326 | zlog_warn( | |
1327 | "RIPv2 address %pI4 is not mask /%d applied one", | |
1328 | &rte->prefix, ip_masklen(rte->mask)); | |
1329 | rip_peer_bad_route(rip, from); | |
1330 | continue; | |
1331 | } | |
1332 | ||
1333 | /* Default route's netmask is ignored. */ | |
1334 | if (packet->version == RIPv2 | |
1335 | && (rte->prefix.s_addr == INADDR_ANY) | |
1336 | && (rte->mask.s_addr != INADDR_ANY)) { | |
1337 | if (IS_RIP_DEBUG_EVENT) | |
1338 | zlog_debug( | |
1339 | "Default route with non-zero netmask. Set zero to netmask"); | |
1340 | rte->mask.s_addr = INADDR_ANY; | |
1341 | } | |
1342 | ||
1343 | /* Routing table updates. */ | |
1344 | rip_rte_process(rte, from, ifc->ifp); | |
1345 | } | |
1346 | } | |
1347 | ||
1348 | /* Make socket for RIP protocol. */ | |
1349 | int rip_create_socket(struct vrf *vrf) | |
1350 | { | |
1351 | int ret; | |
1352 | int sock; | |
1353 | struct sockaddr_in addr; | |
1354 | const char *vrf_dev = NULL; | |
1355 | ||
1356 | memset(&addr, 0, sizeof(struct sockaddr_in)); | |
1357 | addr.sin_family = AF_INET; | |
1358 | addr.sin_addr.s_addr = INADDR_ANY; | |
1359 | #ifdef HAVE_STRUCT_SOCKADDR_IN_SIN_LEN | |
1360 | addr.sin_len = sizeof(struct sockaddr_in); | |
1361 | #endif /* HAVE_STRUCT_SOCKADDR_IN_SIN_LEN */ | |
1362 | /* sending port must always be the RIP port */ | |
1363 | addr.sin_port = htons(RIP_PORT_DEFAULT); | |
1364 | ||
1365 | /* Make datagram socket. */ | |
1366 | if (vrf->vrf_id != VRF_DEFAULT) | |
1367 | vrf_dev = vrf->name; | |
1368 | frr_with_privs(&ripd_privs) { | |
1369 | sock = vrf_socket(AF_INET, SOCK_DGRAM, IPPROTO_UDP, vrf->vrf_id, | |
1370 | vrf_dev); | |
1371 | if (sock < 0) { | |
1372 | flog_err_sys(EC_LIB_SOCKET, | |
1373 | "Cannot create UDP socket: %s", | |
1374 | safe_strerror(errno)); | |
1375 | return -1; | |
1376 | } | |
1377 | } | |
1378 | ||
1379 | sockopt_broadcast(sock); | |
1380 | sockopt_reuseaddr(sock); | |
1381 | sockopt_reuseport(sock); | |
1382 | setsockopt_ipv4_multicast_loop(sock, 0); | |
1383 | #ifdef IPTOS_PREC_INTERNETCONTROL | |
1384 | setsockopt_ipv4_tos(sock, IPTOS_PREC_INTERNETCONTROL); | |
1385 | #endif | |
1386 | setsockopt_so_recvbuf(sock, RIP_UDP_RCV_BUF); | |
1387 | ||
1388 | frr_with_privs(&ripd_privs) { | |
1389 | if ((ret = bind(sock, (struct sockaddr *)&addr, sizeof(addr))) | |
1390 | < 0) { | |
1391 | zlog_err("%s: Can't bind socket %d to %pI4 port %d: %s", | |
1392 | __func__, sock, &addr.sin_addr, | |
1393 | (int)ntohs(addr.sin_port), | |
1394 | safe_strerror(errno)); | |
1395 | ||
1396 | close(sock); | |
1397 | return ret; | |
1398 | } | |
1399 | } | |
1400 | ||
1401 | return sock; | |
1402 | } | |
1403 | ||
1404 | /* RIP packet send to destination address, on interface denoted by | |
1405 | * by connected argument. NULL to argument denotes destination should be | |
1406 | * should be RIP multicast group | |
1407 | */ | |
1408 | static int rip_send_packet(uint8_t *buf, int size, struct sockaddr_in *to, | |
1409 | struct connected *ifc) | |
1410 | { | |
1411 | struct rip_interface *ri; | |
1412 | struct rip *rip; | |
1413 | int ret; | |
1414 | struct sockaddr_in sin; | |
1415 | struct msghdr msg; | |
1416 | struct iovec iov; | |
1417 | #ifdef GNU_LINUX | |
1418 | struct cmsghdr *cmsgptr; | |
1419 | char adata[256] = {}; | |
1420 | struct in_pktinfo *pkt; | |
1421 | #endif /* GNU_LINUX */ | |
1422 | ||
1423 | assert(ifc != NULL); | |
1424 | ri = ifc->ifp->info; | |
1425 | rip = ri->rip; | |
1426 | ||
1427 | if (IS_RIP_DEBUG_PACKET) { | |
1428 | #define ADDRESS_SIZE 20 | |
1429 | char dst[ADDRESS_SIZE]; | |
1430 | ||
1431 | if (to) { | |
1432 | inet_ntop(AF_INET, &to->sin_addr, dst, sizeof(dst)); | |
1433 | } else { | |
1434 | sin.sin_addr.s_addr = htonl(INADDR_RIP_GROUP); | |
1435 | inet_ntop(AF_INET, &sin.sin_addr, dst, sizeof(dst)); | |
1436 | } | |
1437 | #undef ADDRESS_SIZE | |
1438 | zlog_debug("%s %pI4 > %s (%s)", __func__, | |
1439 | &ifc->address->u.prefix4, dst, ifc->ifp->name); | |
1440 | } | |
1441 | ||
1442 | if (CHECK_FLAG(ifc->flags, ZEBRA_IFA_SECONDARY)) { | |
1443 | /* | |
1444 | * ZEBRA_IFA_SECONDARY is set on linux when an interface is | |
1445 | * configured with multiple addresses on the same | |
1446 | * subnet: the first address on the subnet is configured | |
1447 | * "primary", and all subsequent addresses on that subnet | |
1448 | * are treated as "secondary" addresses. In order to avoid | |
1449 | * routing-table bloat on other rip listeners, we do not send | |
1450 | * out RIP packets with ZEBRA_IFA_SECONDARY source addrs. | |
1451 | * XXX Since Linux is the only system for which the | |
1452 | * ZEBRA_IFA_SECONDARY flag is set, we would end up | |
1453 | * sending a packet for a "secondary" source address on | |
1454 | * non-linux systems. | |
1455 | */ | |
1456 | if (IS_RIP_DEBUG_PACKET) | |
1457 | zlog_debug("duplicate dropped"); | |
1458 | return 0; | |
1459 | } | |
1460 | ||
1461 | /* Make destination address. */ | |
1462 | memset(&sin, 0, sizeof(sin)); | |
1463 | sin.sin_family = AF_INET; | |
1464 | #ifdef HAVE_STRUCT_SOCKADDR_IN_SIN_LEN | |
1465 | sin.sin_len = sizeof(struct sockaddr_in); | |
1466 | #endif /* HAVE_STRUCT_SOCKADDR_IN_SIN_LEN */ | |
1467 | ||
1468 | /* When destination is specified, use it's port and address. */ | |
1469 | if (to) { | |
1470 | sin.sin_port = to->sin_port; | |
1471 | sin.sin_addr = to->sin_addr; | |
1472 | } else { | |
1473 | sin.sin_port = htons(RIP_PORT_DEFAULT); | |
1474 | sin.sin_addr.s_addr = htonl(INADDR_RIP_GROUP); | |
1475 | ||
1476 | rip_interface_multicast_set(rip->sock, ifc); | |
1477 | } | |
1478 | ||
1479 | memset(&msg, 0, sizeof(msg)); | |
1480 | msg.msg_name = (void *)&sin; | |
1481 | msg.msg_namelen = sizeof(struct sockaddr_in); | |
1482 | msg.msg_iov = &iov; | |
1483 | msg.msg_iovlen = 1; | |
1484 | iov.iov_base = buf; | |
1485 | iov.iov_len = size; | |
1486 | ||
1487 | #ifdef GNU_LINUX | |
1488 | msg.msg_control = (void *)adata; | |
1489 | msg.msg_controllen = CMSG_SPACE(sizeof(struct in_pktinfo)); | |
1490 | ||
1491 | cmsgptr = (struct cmsghdr *)adata; | |
1492 | cmsgptr->cmsg_len = CMSG_LEN(sizeof(struct in_pktinfo)); | |
1493 | cmsgptr->cmsg_level = IPPROTO_IP; | |
1494 | cmsgptr->cmsg_type = IP_PKTINFO; | |
1495 | pkt = (struct in_pktinfo *)CMSG_DATA(cmsgptr); | |
1496 | pkt->ipi_ifindex = ifc->ifp->ifindex; | |
1497 | pkt->ipi_spec_dst.s_addr = ifc->address->u.prefix4.s_addr; | |
1498 | #endif /* GNU_LINUX */ | |
1499 | ||
1500 | ret = sendmsg(rip->sock, &msg, 0); | |
1501 | ||
1502 | if (IS_RIP_DEBUG_EVENT) | |
1503 | zlog_debug("SEND to %pI4 port %d", &sin.sin_addr, | |
1504 | ntohs(sin.sin_port)); | |
1505 | ||
1506 | if (ret < 0) | |
1507 | zlog_warn("can't send packet : %s", safe_strerror(errno)); | |
1508 | ||
1509 | return ret; | |
1510 | } | |
1511 | ||
1512 | /* Add redistributed route to RIP table. */ | |
1513 | void rip_redistribute_add(struct rip *rip, int type, int sub_type, | |
1514 | struct prefix_ipv4 *p, struct nexthop *nh, | |
1515 | unsigned int metric, unsigned char distance, | |
1516 | route_tag_t tag) | |
1517 | { | |
1518 | int ret; | |
1519 | struct route_node *rp = NULL; | |
1520 | struct rip_info *rinfo = NULL, newinfo; | |
1521 | struct list *list = NULL; | |
1522 | ||
1523 | /* Redistribute route */ | |
1524 | ret = rip_destination_check(p->prefix); | |
1525 | if (!ret) | |
1526 | return; | |
1527 | ||
1528 | rp = route_node_get(rip->table, (struct prefix *)p); | |
1529 | ||
1530 | memset(&newinfo, 0, sizeof(newinfo)); | |
1531 | newinfo.type = type; | |
1532 | newinfo.sub_type = sub_type; | |
1533 | newinfo.metric = 1; | |
1534 | newinfo.external_metric = metric; | |
1535 | newinfo.distance = distance; | |
1536 | if (tag <= UINT16_MAX) /* RIP only supports 16 bit tags */ | |
1537 | newinfo.tag = tag; | |
1538 | newinfo.rp = rp; | |
1539 | newinfo.nh = *nh; | |
1540 | ||
1541 | if ((list = rp->info) != NULL && listcount(list) != 0) { | |
1542 | rinfo = listgetdata(listhead(list)); | |
1543 | ||
1544 | if (rinfo->type == ZEBRA_ROUTE_CONNECT | |
1545 | && rinfo->sub_type == RIP_ROUTE_INTERFACE | |
1546 | && rinfo->metric != RIP_METRIC_INFINITY) { | |
1547 | route_unlock_node(rp); | |
1548 | return; | |
1549 | } | |
1550 | ||
1551 | /* Manually configured RIP route check. */ | |
1552 | if (rinfo->type == ZEBRA_ROUTE_RIP | |
1553 | && ((rinfo->sub_type == RIP_ROUTE_STATIC) | |
1554 | || (rinfo->sub_type == RIP_ROUTE_DEFAULT))) { | |
1555 | if (type != ZEBRA_ROUTE_RIP | |
1556 | || ((sub_type != RIP_ROUTE_STATIC) | |
1557 | && (sub_type != RIP_ROUTE_DEFAULT))) { | |
1558 | route_unlock_node(rp); | |
1559 | return; | |
1560 | } | |
1561 | } | |
1562 | ||
1563 | (void)rip_ecmp_replace(rip, &newinfo); | |
1564 | route_unlock_node(rp); | |
1565 | } else | |
1566 | (void)rip_ecmp_add(rip, &newinfo); | |
1567 | ||
1568 | if (IS_RIP_DEBUG_EVENT) { | |
1569 | zlog_debug("Redistribute new prefix %pFX", p); | |
1570 | } | |
1571 | ||
1572 | rip_event(rip, RIP_TRIGGERED_UPDATE, 0); | |
1573 | } | |
1574 | ||
1575 | /* Delete redistributed route from RIP table. */ | |
1576 | void rip_redistribute_delete(struct rip *rip, int type, int sub_type, | |
1577 | struct prefix_ipv4 *p, ifindex_t ifindex) | |
1578 | { | |
1579 | int ret; | |
1580 | struct route_node *rp; | |
1581 | struct rip_info *rinfo; | |
1582 | ||
1583 | ret = rip_destination_check(p->prefix); | |
1584 | if (!ret) | |
1585 | return; | |
1586 | ||
1587 | rp = route_node_lookup(rip->table, (struct prefix *)p); | |
1588 | if (rp) { | |
1589 | struct list *list = rp->info; | |
1590 | ||
1591 | if (list != NULL && listcount(list) != 0) { | |
1592 | rinfo = listgetdata(listhead(list)); | |
1593 | if (rinfo != NULL && rinfo->type == type | |
1594 | && rinfo->sub_type == sub_type | |
1595 | && rinfo->nh.ifindex == ifindex) { | |
1596 | /* Perform poisoned reverse. */ | |
1597 | rinfo->metric = RIP_METRIC_INFINITY; | |
1598 | RIP_TIMER_ON(rinfo->t_garbage_collect, | |
1599 | rip_garbage_collect, | |
1600 | rip->garbage_time); | |
1601 | EVENT_OFF(rinfo->t_timeout); | |
1602 | rinfo->flags |= RIP_RTF_CHANGED; | |
1603 | ||
1604 | if (IS_RIP_DEBUG_EVENT) | |
1605 | zlog_debug( | |
1606 | "Poison %pFX on the interface %s with an infinity metric [delete]", | |
1607 | p, | |
1608 | ifindex2ifname( | |
1609 | ifindex, | |
1610 | rip->vrf->vrf_id)); | |
1611 | ||
1612 | rip_event(rip, RIP_TRIGGERED_UPDATE, 0); | |
1613 | } | |
1614 | } | |
1615 | route_unlock_node(rp); | |
1616 | } | |
1617 | } | |
1618 | ||
1619 | /* Response to request called from rip_read ().*/ | |
1620 | static void rip_request_process(struct rip_packet *packet, int size, | |
1621 | struct sockaddr_in *from, struct connected *ifc) | |
1622 | { | |
1623 | struct rip *rip; | |
1624 | caddr_t lim; | |
1625 | struct rte *rte; | |
1626 | struct prefix_ipv4 p; | |
1627 | struct route_node *rp; | |
1628 | struct rip_info *rinfo; | |
1629 | struct rip_interface *ri; | |
1630 | ||
1631 | /* Does not reponse to the requests on the loopback interfaces */ | |
1632 | if (if_is_loopback(ifc->ifp)) | |
1633 | return; | |
1634 | ||
1635 | /* Check RIP process is enabled on this interface. */ | |
1636 | ri = ifc->ifp->info; | |
1637 | if (!ri->running) | |
1638 | return; | |
1639 | rip = ri->rip; | |
1640 | ||
1641 | /* When passive interface is specified, suppress responses */ | |
1642 | if (ri->passive) | |
1643 | return; | |
1644 | ||
1645 | /* RIP peer update. */ | |
1646 | rip_peer_update(rip, from, packet->version); | |
1647 | ||
1648 | lim = ((caddr_t)packet) + size; | |
1649 | rte = packet->rte; | |
1650 | ||
1651 | /* The Request is processed entry by entry. If there are no | |
1652 | entries, no response is given. */ | |
1653 | if (lim == (caddr_t)rte) | |
1654 | return; | |
1655 | ||
1656 | /* There is one special case. If there is exactly one entry in the | |
1657 | request, and it has an address family identifier of zero and a | |
1658 | metric of infinity (i.e., 16), then this is a request to send the | |
1659 | entire routing table. */ | |
1660 | if (lim == ((caddr_t)(rte + 1)) && ntohs(rte->family) == 0 | |
1661 | && ntohl(rte->metric) == RIP_METRIC_INFINITY) { | |
1662 | /* All route with split horizon */ | |
1663 | rip_output_process(ifc, from, rip_all_route, packet->version); | |
1664 | } else { | |
1665 | if (ntohs(rte->family) != AF_INET) | |
1666 | return; | |
1667 | ||
1668 | /* Examine the list of RTEs in the Request one by one. For each | |
1669 | entry, look up the destination in the router's routing | |
1670 | database and, if there is a route, put that route's metric in | |
1671 | the metric field of the RTE. If there is no explicit route | |
1672 | to the specified destination, put infinity in the metric | |
1673 | field. Once all the entries have been filled in, change the | |
1674 | command from Request to Response and send the datagram back | |
1675 | to the requestor. */ | |
1676 | p.family = AF_INET; | |
1677 | ||
1678 | for (; ((caddr_t)rte) < lim; rte++) { | |
1679 | p.prefix = rte->prefix; | |
1680 | p.prefixlen = ip_masklen(rte->mask); | |
1681 | apply_mask_ipv4(&p); | |
1682 | ||
1683 | rp = route_node_lookup(rip->table, (struct prefix *)&p); | |
1684 | if (rp) { | |
1685 | rinfo = listgetdata( | |
1686 | listhead((struct list *)rp->info)); | |
1687 | rte->metric = htonl(rinfo->metric); | |
1688 | route_unlock_node(rp); | |
1689 | } else | |
1690 | rte->metric = htonl(RIP_METRIC_INFINITY); | |
1691 | } | |
1692 | packet->command = RIP_RESPONSE; | |
1693 | ||
1694 | (void)rip_send_packet((uint8_t *)packet, size, from, ifc); | |
1695 | } | |
1696 | rip->counters.queries++; | |
1697 | } | |
1698 | ||
1699 | /* First entry point of RIP packet. */ | |
1700 | static void rip_read(struct event *t) | |
1701 | { | |
1702 | struct rip *rip = EVENT_ARG(t); | |
1703 | int sock; | |
1704 | int ret; | |
1705 | int rtenum; | |
1706 | union rip_buf rip_buf; | |
1707 | struct rip_packet *packet; | |
1708 | struct sockaddr_in from; | |
1709 | int len; | |
1710 | int vrecv; | |
1711 | socklen_t fromlen; | |
1712 | struct interface *ifp = NULL; | |
1713 | struct connected *ifc; | |
1714 | struct rip_interface *ri; | |
1715 | struct prefix p; | |
1716 | ||
1717 | /* Fetch socket then register myself. */ | |
1718 | sock = EVENT_FD(t); | |
1719 | ||
1720 | /* Add myself to tne next event */ | |
1721 | rip_event(rip, RIP_READ, sock); | |
1722 | ||
1723 | /* RIPd manages only IPv4. */ | |
1724 | memset(&from, 0, sizeof(from)); | |
1725 | fromlen = sizeof(struct sockaddr_in); | |
1726 | ||
1727 | len = recvfrom(sock, (char *)&rip_buf.buf, sizeof(rip_buf.buf), 0, | |
1728 | (struct sockaddr *)&from, &fromlen); | |
1729 | if (len < 0) { | |
1730 | zlog_info("recvfrom failed (VRF %s): %s", rip->vrf_name, | |
1731 | safe_strerror(errno)); | |
1732 | return; | |
1733 | } | |
1734 | ||
1735 | /* Check is this packet comming from myself? */ | |
1736 | if (if_check_address(rip, from.sin_addr)) { | |
1737 | if (IS_RIP_DEBUG_PACKET) | |
1738 | zlog_debug("ignore packet comes from myself (VRF %s)", | |
1739 | rip->vrf_name); | |
1740 | return; | |
1741 | } | |
1742 | ||
1743 | /* Which interface is this packet comes from. */ | |
1744 | ifc = if_lookup_address((void *)&from.sin_addr, AF_INET, | |
1745 | rip->vrf->vrf_id); | |
1746 | if (ifc) | |
1747 | ifp = ifc->ifp; | |
1748 | ||
1749 | /* RIP packet received */ | |
1750 | if (IS_RIP_DEBUG_EVENT) | |
1751 | zlog_debug("RECV packet from %pI4 port %d on %s (VRF %s)", | |
1752 | &from.sin_addr, ntohs(from.sin_port), | |
1753 | ifp ? ifp->name : "unknown", rip->vrf_name); | |
1754 | ||
1755 | /* If this packet come from unknown interface, ignore it. */ | |
1756 | if (ifp == NULL) { | |
1757 | zlog_info( | |
1758 | "%s: cannot find interface for packet from %pI4 port %d (VRF %s)", | |
1759 | __func__, &from.sin_addr, ntohs(from.sin_port), | |
1760 | rip->vrf_name); | |
1761 | return; | |
1762 | } | |
1763 | ||
1764 | p.family = AF_INET; | |
1765 | p.u.prefix4 = from.sin_addr; | |
1766 | p.prefixlen = IPV4_MAX_BITLEN; | |
1767 | ||
1768 | ifc = connected_lookup_prefix(ifp, &p); | |
1769 | ||
1770 | if (ifc == NULL) { | |
1771 | zlog_info( | |
1772 | "%s: cannot find connected address for packet from %pI4 port %d on interface %s (VRF %s)", | |
1773 | __func__, &from.sin_addr, ntohs(from.sin_port), | |
1774 | ifp->name, rip->vrf_name); | |
1775 | return; | |
1776 | } | |
1777 | ||
1778 | /* Packet length check. */ | |
1779 | if (len < RIP_PACKET_MINSIZ) { | |
1780 | zlog_warn("packet size %d is smaller than minimum size %d", len, | |
1781 | RIP_PACKET_MINSIZ); | |
1782 | rip_peer_bad_packet(rip, &from); | |
1783 | return; | |
1784 | } | |
1785 | if (len > RIP_PACKET_MAXSIZ) { | |
1786 | zlog_warn("packet size %d is larger than max size %d", len, | |
1787 | RIP_PACKET_MAXSIZ); | |
1788 | rip_peer_bad_packet(rip, &from); | |
1789 | return; | |
1790 | } | |
1791 | ||
1792 | /* Packet alignment check. */ | |
1793 | if ((len - RIP_PACKET_MINSIZ) % 20) { | |
1794 | zlog_warn("packet size %d is wrong for RIP packet alignment", | |
1795 | len); | |
1796 | rip_peer_bad_packet(rip, &from); | |
1797 | return; | |
1798 | } | |
1799 | ||
1800 | /* Set RTE number. */ | |
1801 | rtenum = ((len - RIP_PACKET_MINSIZ) / 20); | |
1802 | ||
1803 | /* For easy to handle. */ | |
1804 | packet = &rip_buf.rip_packet; | |
1805 | ||
1806 | /* RIP version check. */ | |
1807 | if (packet->version == 0) { | |
1808 | zlog_info("version 0 with command %d received.", | |
1809 | packet->command); | |
1810 | rip_peer_bad_packet(rip, &from); | |
1811 | return; | |
1812 | } | |
1813 | ||
1814 | /* Dump RIP packet. */ | |
1815 | if (IS_RIP_DEBUG_RECV) | |
1816 | rip_packet_dump(packet, len, "RECV"); | |
1817 | ||
1818 | /* RIP version adjust. This code should rethink now. RFC1058 says | |
1819 | that "Version 1 implementations are to ignore this extra data and | |
1820 | process only the fields specified in this document.". So RIPv3 | |
1821 | packet should be treated as RIPv1 ignoring must be zero field. */ | |
1822 | if (packet->version > RIPv2) | |
1823 | packet->version = RIPv2; | |
1824 | ||
1825 | /* Is RIP running or is this RIP neighbor ?*/ | |
1826 | ri = ifp->info; | |
1827 | if (!ri->running && !rip_neighbor_lookup(rip, &from)) { | |
1828 | if (IS_RIP_DEBUG_EVENT) | |
1829 | zlog_debug("RIP is not enabled on interface %s.", | |
1830 | ifp->name); | |
1831 | rip_peer_bad_packet(rip, &from); | |
1832 | return; | |
1833 | } | |
1834 | ||
1835 | /* RIP Version check. RFC2453, 4.6 and 5.1 */ | |
1836 | vrecv = ((ri->ri_receive == RI_RIP_UNSPEC) ? rip->version_recv | |
1837 | : ri->ri_receive); | |
1838 | if (vrecv == RI_RIP_VERSION_NONE | |
1839 | || ((packet->version == RIPv1) && !(vrecv & RIPv1)) | |
1840 | || ((packet->version == RIPv2) && !(vrecv & RIPv2))) { | |
1841 | if (IS_RIP_DEBUG_PACKET) | |
1842 | zlog_debug( | |
1843 | " packet's v%d doesn't fit to if version spec", | |
1844 | packet->version); | |
1845 | rip_peer_bad_packet(rip, &from); | |
1846 | return; | |
1847 | } | |
1848 | ||
1849 | /* RFC2453 5.2 If the router is not configured to authenticate RIP-2 | |
1850 | messages, then RIP-1 and unauthenticated RIP-2 messages will be | |
1851 | accepted; authenticated RIP-2 messages shall be discarded. */ | |
1852 | if ((ri->auth_type == RIP_NO_AUTH) && rtenum | |
1853 | && (packet->version == RIPv2) | |
1854 | && (packet->rte->family == htons(RIP_FAMILY_AUTH))) { | |
1855 | if (IS_RIP_DEBUG_EVENT) | |
1856 | zlog_debug( | |
1857 | "packet RIPv%d is dropped because authentication disabled", | |
1858 | packet->version); | |
1859 | ripd_notif_send_auth_type_failure(ifp->name); | |
1860 | rip_peer_bad_packet(rip, &from); | |
1861 | return; | |
1862 | } | |
1863 | ||
1864 | /* RFC: | |
1865 | If the router is configured to authenticate RIP-2 messages, then | |
1866 | RIP-1 messages and RIP-2 messages which pass authentication | |
1867 | testing shall be accepted; unauthenticated and failed | |
1868 | authentication RIP-2 messages shall be discarded. For maximum | |
1869 | security, RIP-1 messages should be ignored when authentication is | |
1870 | in use (see section 4.1); otherwise, the routing information from | |
1871 | authenticated messages will be propagated by RIP-1 routers in an | |
1872 | unauthenticated manner. | |
1873 | */ | |
1874 | /* We make an exception for RIPv1 REQUEST packets, to which we'll | |
1875 | * always reply regardless of authentication settings, because: | |
1876 | * | |
1877 | * - if there other authorised routers on-link, the REQUESTor can | |
1878 | * passively obtain the routing updates anyway | |
1879 | * - if there are no other authorised routers on-link, RIP can | |
1880 | * easily be disabled for the link to prevent giving out information | |
1881 | * on state of this routers RIP routing table.. | |
1882 | * | |
1883 | * I.e. if RIPv1 has any place anymore these days, it's as a very | |
1884 | * simple way to distribute routing information (e.g. to embedded | |
1885 | * hosts / appliances) and the ability to give out RIPv1 | |
1886 | * routing-information freely, while still requiring RIPv2 | |
1887 | * authentication for any RESPONSEs might be vaguely useful. | |
1888 | */ | |
1889 | if (ri->auth_type != RIP_NO_AUTH && packet->version == RIPv1) { | |
1890 | /* Discard RIPv1 messages other than REQUESTs */ | |
1891 | if (packet->command != RIP_REQUEST) { | |
1892 | if (IS_RIP_DEBUG_PACKET) | |
1893 | zlog_debug( | |
1894 | "RIPv1 dropped because authentication enabled"); | |
1895 | ripd_notif_send_auth_type_failure(ifp->name); | |
1896 | rip_peer_bad_packet(rip, &from); | |
1897 | return; | |
1898 | } | |
1899 | } else if (ri->auth_type != RIP_NO_AUTH) { | |
1900 | const char *auth_desc; | |
1901 | ||
1902 | if (rtenum == 0) { | |
1903 | /* There definitely is no authentication in the packet. | |
1904 | */ | |
1905 | if (IS_RIP_DEBUG_PACKET) | |
1906 | zlog_debug( | |
1907 | "RIPv2 authentication failed: no auth RTE in packet"); | |
1908 | ripd_notif_send_auth_type_failure(ifp->name); | |
1909 | rip_peer_bad_packet(rip, &from); | |
1910 | return; | |
1911 | } | |
1912 | ||
1913 | /* First RTE must be an Authentication Family RTE */ | |
1914 | if (packet->rte->family != htons(RIP_FAMILY_AUTH)) { | |
1915 | if (IS_RIP_DEBUG_PACKET) | |
1916 | zlog_debug( | |
1917 | "RIPv2 dropped because authentication enabled"); | |
1918 | ripd_notif_send_auth_type_failure(ifp->name); | |
1919 | rip_peer_bad_packet(rip, &from); | |
1920 | return; | |
1921 | } | |
1922 | ||
1923 | /* Check RIPv2 authentication. */ | |
1924 | switch (ntohs(packet->rte->tag)) { | |
1925 | case RIP_AUTH_SIMPLE_PASSWORD: | |
1926 | auth_desc = "simple"; | |
1927 | ret = rip_auth_simple_password(packet->rte, &from, ifp); | |
1928 | break; | |
1929 | ||
1930 | case RIP_AUTH_MD5: | |
1931 | auth_desc = "MD5"; | |
1932 | ret = rip_auth_md5(packet, &from, len, ifp); | |
1933 | /* Reset RIP packet length to trim MD5 data. */ | |
1934 | len = ret; | |
1935 | break; | |
1936 | ||
1937 | default: | |
1938 | ret = 0; | |
1939 | auth_desc = "unknown type"; | |
1940 | if (IS_RIP_DEBUG_PACKET) | |
1941 | zlog_debug( | |
1942 | "RIPv2 Unknown authentication type %d", | |
1943 | ntohs(packet->rte->tag)); | |
1944 | } | |
1945 | ||
1946 | if (ret) { | |
1947 | if (IS_RIP_DEBUG_PACKET) | |
1948 | zlog_debug("RIPv2 %s authentication success", | |
1949 | auth_desc); | |
1950 | } else { | |
1951 | if (IS_RIP_DEBUG_PACKET) | |
1952 | zlog_debug("RIPv2 %s authentication failure", | |
1953 | auth_desc); | |
1954 | ripd_notif_send_auth_failure(ifp->name); | |
1955 | rip_peer_bad_packet(rip, &from); | |
1956 | return; | |
1957 | } | |
1958 | } | |
1959 | ||
1960 | /* Process each command. */ | |
1961 | switch (packet->command) { | |
1962 | case RIP_RESPONSE: | |
1963 | rip_response_process(packet, len, &from, ifc); | |
1964 | break; | |
1965 | case RIP_REQUEST: | |
1966 | case RIP_POLL: | |
1967 | rip_request_process(packet, len, &from, ifc); | |
1968 | break; | |
1969 | case RIP_TRACEON: | |
1970 | case RIP_TRACEOFF: | |
1971 | zlog_info( | |
1972 | "Obsolete command %s received, please sent it to routed", | |
1973 | lookup_msg(rip_msg, packet->command, NULL)); | |
1974 | rip_peer_bad_packet(rip, &from); | |
1975 | break; | |
1976 | case RIP_POLL_ENTRY: | |
1977 | zlog_info("Obsolete command %s received", | |
1978 | lookup_msg(rip_msg, packet->command, NULL)); | |
1979 | rip_peer_bad_packet(rip, &from); | |
1980 | break; | |
1981 | default: | |
1982 | zlog_info("Unknown RIP command %d received", packet->command); | |
1983 | rip_peer_bad_packet(rip, &from); | |
1984 | break; | |
1985 | } | |
1986 | } | |
1987 | ||
1988 | /* Write routing table entry to the stream and return next index of | |
1989 | the routing table entry in the stream. */ | |
1990 | static int rip_write_rte(int num, struct stream *s, struct prefix_ipv4 *p, | |
1991 | uint8_t version, struct rip_info *rinfo) | |
1992 | { | |
1993 | struct in_addr mask; | |
1994 | ||
1995 | /* Write routing table entry. */ | |
1996 | if (version == RIPv1) { | |
1997 | stream_putw(s, AF_INET); | |
1998 | stream_putw(s, 0); | |
1999 | stream_put_ipv4(s, p->prefix.s_addr); | |
2000 | stream_put_ipv4(s, 0); | |
2001 | stream_put_ipv4(s, 0); | |
2002 | stream_putl(s, rinfo->metric_out); | |
2003 | } else { | |
2004 | masklen2ip(p->prefixlen, &mask); | |
2005 | ||
2006 | stream_putw(s, AF_INET); | |
2007 | stream_putw(s, rinfo->tag_out); | |
2008 | stream_put_ipv4(s, p->prefix.s_addr); | |
2009 | stream_put_ipv4(s, mask.s_addr); | |
2010 | stream_put_ipv4(s, rinfo->nexthop_out.s_addr); | |
2011 | stream_putl(s, rinfo->metric_out); | |
2012 | } | |
2013 | ||
2014 | return ++num; | |
2015 | } | |
2016 | ||
2017 | /* Send update to the ifp or spcified neighbor. */ | |
2018 | void rip_output_process(struct connected *ifc, struct sockaddr_in *to, | |
2019 | int route_type, uint8_t version) | |
2020 | { | |
2021 | struct rip *rip; | |
2022 | int ret; | |
2023 | struct stream *s; | |
2024 | struct route_node *rp; | |
2025 | struct rip_info *rinfo; | |
2026 | struct rip_interface *ri; | |
2027 | struct prefix_ipv4 *p; | |
2028 | struct prefix_ipv4 classfull; | |
2029 | struct prefix_ipv4 ifaddrclass; | |
2030 | struct key *key = NULL; | |
2031 | /* this might need to made dynamic if RIP ever supported auth methods | |
2032 | with larger key string sizes */ | |
2033 | char auth_str[RIP_AUTH_SIMPLE_SIZE]; | |
2034 | size_t doff = 0; /* offset of digest offset field */ | |
2035 | int num = 0; | |
2036 | int rtemax; | |
2037 | int subnetted = 0; | |
2038 | struct list *list = NULL; | |
2039 | struct listnode *listnode = NULL; | |
2040 | ||
2041 | /* Logging output event. */ | |
2042 | if (IS_RIP_DEBUG_EVENT) { | |
2043 | if (to) | |
2044 | zlog_debug("update routes to neighbor %pI4", | |
2045 | &to->sin_addr); | |
2046 | else | |
2047 | zlog_debug("update routes on interface %s ifindex %d", | |
2048 | ifc->ifp->name, ifc->ifp->ifindex); | |
2049 | } | |
2050 | ||
2051 | /* Get RIP interface. */ | |
2052 | ri = ifc->ifp->info; | |
2053 | rip = ri->rip; | |
2054 | ||
2055 | /* Set output stream. */ | |
2056 | s = rip->obuf; | |
2057 | ||
2058 | /* Reset stream and RTE counter. */ | |
2059 | stream_reset(s); | |
2060 | rtemax = RIP_MAX_RTE; | |
2061 | ||
2062 | /* If output interface is in simple password authentication mode, we | |
2063 | need space for authentication data. */ | |
2064 | if (ri->auth_type == RIP_AUTH_SIMPLE_PASSWORD) | |
2065 | rtemax -= 1; | |
2066 | ||
2067 | /* If output interface is in MD5 authentication mode, we need space | |
2068 | for authentication header and data. */ | |
2069 | if (ri->auth_type == RIP_AUTH_MD5) | |
2070 | rtemax -= 2; | |
2071 | ||
2072 | /* If output interface is in simple password authentication mode | |
2073 | and string or keychain is specified we need space for auth. data */ | |
2074 | if (ri->auth_type != RIP_NO_AUTH) { | |
2075 | if (ri->key_chain) { | |
2076 | struct keychain *keychain; | |
2077 | ||
2078 | keychain = keychain_lookup(ri->key_chain); | |
2079 | if (keychain) | |
2080 | key = key_lookup_for_send(keychain); | |
2081 | } | |
2082 | /* to be passed to auth functions later */ | |
2083 | rip_auth_prepare_str_send(ri, key, auth_str, sizeof(auth_str)); | |
2084 | if (strlen(auth_str) == 0) | |
2085 | return; | |
2086 | } | |
2087 | ||
2088 | if (version == RIPv1) { | |
2089 | memcpy(&ifaddrclass, ifc->address, sizeof(ifaddrclass)); | |
2090 | apply_classful_mask_ipv4(&ifaddrclass); | |
2091 | subnetted = 0; | |
2092 | if (ifc->address->prefixlen > ifaddrclass.prefixlen) | |
2093 | subnetted = 1; | |
2094 | } | |
2095 | ||
2096 | for (rp = route_top(rip->table); rp; rp = route_next(rp)) { | |
2097 | list = rp->info; | |
2098 | ||
2099 | if (list == NULL) | |
2100 | continue; | |
2101 | ||
2102 | if (listcount(list) == 0) | |
2103 | continue; | |
2104 | ||
2105 | rinfo = listgetdata(listhead(list)); | |
2106 | /* | |
2107 | * For RIPv1, if we are subnetted, output subnets in our | |
2108 | * network that have the same mask as the output "interface". | |
2109 | * For other networks, only the classfull version is output. | |
2110 | */ | |
2111 | if (version == RIPv1) { | |
2112 | p = (struct prefix_ipv4 *)&rp->p; | |
2113 | ||
2114 | if (IS_RIP_DEBUG_PACKET) | |
2115 | zlog_debug( | |
2116 | "RIPv1 mask check, %pFX considered for output", | |
2117 | &rp->p); | |
2118 | ||
2119 | if (subnetted && | |
2120 | prefix_match((struct prefix *)&ifaddrclass, | |
2121 | &rp->p)) { | |
2122 | if ((ifc->address->prefixlen != | |
2123 | rp->p.prefixlen) && | |
2124 | (rp->p.prefixlen != IPV4_MAX_BITLEN)) | |
2125 | continue; | |
2126 | } else { | |
2127 | memcpy(&classfull, &rp->p, | |
2128 | sizeof(struct prefix_ipv4)); | |
2129 | apply_classful_mask_ipv4(&classfull); | |
2130 | if (rp->p.u.prefix4.s_addr != INADDR_ANY && | |
2131 | classfull.prefixlen != rp->p.prefixlen) | |
2132 | continue; | |
2133 | } | |
2134 | if (IS_RIP_DEBUG_PACKET) | |
2135 | zlog_debug( | |
2136 | "RIPv1 mask check, %pFX made it through", | |
2137 | &rp->p); | |
2138 | } else | |
2139 | p = (struct prefix_ipv4 *)&rp->p; | |
2140 | ||
2141 | /* Apply output filters. */ | |
2142 | ret = rip_filter(RIP_FILTER_OUT, p, ri); | |
2143 | if (ret < 0) | |
2144 | continue; | |
2145 | ||
2146 | /* Changed route only output. */ | |
2147 | if (route_type == rip_changed_route && | |
2148 | (!(rinfo->flags & RIP_RTF_CHANGED))) | |
2149 | continue; | |
2150 | ||
2151 | /* Split horizon. */ | |
2152 | if (ri->split_horizon == RIP_SPLIT_HORIZON) { | |
2153 | /* | |
2154 | * We perform split horizon for RIP and connected | |
2155 | * route. For rip routes, we want to suppress the | |
2156 | * route if we would end up sending the route back on | |
2157 | * the interface that we learned it from, with a | |
2158 | * higher metric. For connected routes, we suppress | |
2159 | * the route if the prefix is a subset of the source | |
2160 | * address that we are going to use for the packet | |
2161 | * (in order to handle the case when multiple subnets | |
2162 | * are configured on the same interface). | |
2163 | */ | |
2164 | int suppress = 0; | |
2165 | struct rip_info *tmp_rinfo = NULL; | |
2166 | struct connected *tmp_ifc = NULL; | |
2167 | ||
2168 | for (ALL_LIST_ELEMENTS_RO(list, listnode, tmp_rinfo)) | |
2169 | if (tmp_rinfo->type == ZEBRA_ROUTE_RIP && | |
2170 | tmp_rinfo->nh.ifindex == | |
2171 | ifc->ifp->ifindex) { | |
2172 | suppress = 1; | |
2173 | break; | |
2174 | } | |
2175 | ||
2176 | if (!suppress && rinfo->type == ZEBRA_ROUTE_CONNECT) { | |
2177 | for (ALL_LIST_ELEMENTS_RO(ifc->ifp->connected, | |
2178 | listnode, tmp_ifc)) | |
2179 | if (prefix_match((struct prefix *)p, | |
2180 | tmp_ifc->address)) { | |
2181 | suppress = 1; | |
2182 | break; | |
2183 | } | |
2184 | } | |
2185 | ||
2186 | if (suppress) | |
2187 | continue; | |
2188 | } | |
2189 | ||
2190 | /* Preparation for route-map. */ | |
2191 | rinfo->metric_set = 0; | |
2192 | rinfo->nexthop_out.s_addr = 0; | |
2193 | rinfo->metric_out = rinfo->metric; | |
2194 | rinfo->tag_out = rinfo->tag; | |
2195 | rinfo->ifindex_out = ifc->ifp->ifindex; | |
2196 | ||
2197 | /* In order to avoid some local loops, if the RIP route has | |
2198 | * a nexthop via this interface, keep the nexthop, otherwise | |
2199 | * set it to 0. The nexthop should not be propagated beyond | |
2200 | * the local broadcast/multicast area in order to avoid an | |
2201 | * IGP multi-level recursive look-up. see (4.4) | |
2202 | */ | |
2203 | if (rinfo->nh.ifindex == ifc->ifp->ifindex) | |
2204 | rinfo->nexthop_out = rinfo->nh.gate.ipv4; | |
2205 | ||
2206 | /* Interface route-map */ | |
2207 | if (ri->routemap[RIP_FILTER_OUT]) { | |
2208 | ret = route_map_apply(ri->routemap[RIP_FILTER_OUT], | |
2209 | (struct prefix *)p, rinfo); | |
2210 | ||
2211 | if (ret == RMAP_DENYMATCH) { | |
2212 | if (IS_RIP_DEBUG_PACKET) | |
2213 | zlog_debug( | |
2214 | "RIP %pFX is filtered by route-map out", | |
2215 | p); | |
2216 | continue; | |
2217 | } | |
2218 | } | |
2219 | ||
2220 | /* Apply redistribute route map - continue, if deny */ | |
2221 | if (rip->redist[rinfo->type].route_map.name && | |
2222 | rinfo->sub_type != RIP_ROUTE_INTERFACE) { | |
2223 | ret = route_map_apply( | |
2224 | rip->redist[rinfo->type].route_map.map, | |
2225 | (struct prefix *)p, rinfo); | |
2226 | ||
2227 | if (ret == RMAP_DENYMATCH) { | |
2228 | if (IS_RIP_DEBUG_PACKET) | |
2229 | zlog_debug( | |
2230 | "%pFX is filtered by route-map", | |
2231 | p); | |
2232 | continue; | |
2233 | } | |
2234 | } | |
2235 | ||
2236 | /* When route-map does not set metric. */ | |
2237 | if (!rinfo->metric_set) { | |
2238 | /* If redistribute metric is set. */ | |
2239 | if (rip->redist[rinfo->type].metric_config && | |
2240 | rinfo->metric != RIP_METRIC_INFINITY) { | |
2241 | rinfo->metric_out = | |
2242 | rip->redist[rinfo->type].metric; | |
2243 | } else { | |
2244 | /* If the route is not connected or localy | |
2245 | * generated one, use default-metric value | |
2246 | */ | |
2247 | if (rinfo->type != ZEBRA_ROUTE_RIP && | |
2248 | rinfo->type != ZEBRA_ROUTE_CONNECT && | |
2249 | rinfo->metric != RIP_METRIC_INFINITY) | |
2250 | rinfo->metric_out = rip->default_metric; | |
2251 | } | |
2252 | } | |
2253 | ||
2254 | /* Apply offset-list */ | |
2255 | if (rinfo->metric != RIP_METRIC_INFINITY) | |
2256 | rip_offset_list_apply_out(p, ifc->ifp, | |
2257 | &rinfo->metric_out); | |
2258 | ||
2259 | if (rinfo->metric_out > RIP_METRIC_INFINITY) | |
2260 | rinfo->metric_out = RIP_METRIC_INFINITY; | |
2261 | ||
2262 | /* Perform split-horizon with poisoned reverse | |
2263 | * for RIP and connected routes. | |
2264 | **/ | |
2265 | if (ri->split_horizon == RIP_SPLIT_HORIZON_POISONED_REVERSE) { | |
2266 | /* | |
2267 | * We perform split horizon for RIP and connected | |
2268 | * route. For rip routes, we want to suppress the | |
2269 | * route if we would end up sending the route back | |
2270 | * on the interface that we learned it from, with a | |
2271 | * higher metric. For connected routes, we suppress | |
2272 | * the route if the prefix is a subset of the source | |
2273 | * address that we are going to use for the packet | |
2274 | * (in order to handle the case when multiple | |
2275 | * subnets are configured on the same interface). | |
2276 | */ | |
2277 | struct rip_info *tmp_rinfo = NULL; | |
2278 | struct connected *tmp_ifc = NULL; | |
2279 | ||
2280 | for (ALL_LIST_ELEMENTS_RO(list, listnode, tmp_rinfo)) | |
2281 | if (tmp_rinfo->type == ZEBRA_ROUTE_RIP && | |
2282 | tmp_rinfo->nh.ifindex == ifc->ifp->ifindex) | |
2283 | rinfo->metric_out = RIP_METRIC_INFINITY; | |
2284 | ||
2285 | if (rinfo->metric_out != RIP_METRIC_INFINITY && | |
2286 | rinfo->type == ZEBRA_ROUTE_CONNECT) { | |
2287 | for (ALL_LIST_ELEMENTS_RO(ifc->ifp->connected, | |
2288 | listnode, tmp_ifc)) | |
2289 | if (prefix_match((struct prefix *)p, | |
2290 | tmp_ifc->address)) { | |
2291 | rinfo->metric_out = | |
2292 | RIP_METRIC_INFINITY; | |
2293 | break; | |
2294 | } | |
2295 | } | |
2296 | } | |
2297 | ||
2298 | /* Prepare preamble, auth headers, if needs be */ | |
2299 | if (num == 0) { | |
2300 | stream_putc(s, RIP_RESPONSE); | |
2301 | stream_putc(s, version); | |
2302 | stream_putw(s, 0); | |
2303 | ||
2304 | /* auth header for !v1 && !no_auth */ | |
2305 | if ((ri->auth_type != RIP_NO_AUTH) && | |
2306 | (version != RIPv1)) | |
2307 | doff = rip_auth_header_write( | |
2308 | s, ri, key, auth_str, | |
2309 | RIP_AUTH_SIMPLE_SIZE); | |
2310 | } | |
2311 | ||
2312 | /* Write RTE to the stream. */ | |
2313 | num = rip_write_rte(num, s, p, version, rinfo); | |
2314 | if (num == rtemax) { | |
2315 | if (version == RIPv2 && ri->auth_type == RIP_AUTH_MD5) | |
2316 | rip_auth_md5_set(s, ri, doff, auth_str, | |
2317 | RIP_AUTH_SIMPLE_SIZE); | |
2318 | ||
2319 | ret = rip_send_packet(STREAM_DATA(s), | |
2320 | stream_get_endp(s), to, ifc); | |
2321 | ||
2322 | if (ret >= 0 && IS_RIP_DEBUG_SEND) | |
2323 | rip_packet_dump( | |
2324 | (struct rip_packet *)STREAM_DATA(s), | |
2325 | stream_get_endp(s), "SEND"); | |
2326 | num = 0; | |
2327 | stream_reset(s); | |
2328 | } | |
2329 | } | |
2330 | ||
2331 | /* Flush unwritten RTE. */ | |
2332 | if (num != 0) { | |
2333 | if (version == RIPv2 && ri->auth_type == RIP_AUTH_MD5) | |
2334 | rip_auth_md5_set(s, ri, doff, auth_str, | |
2335 | RIP_AUTH_SIMPLE_SIZE); | |
2336 | ||
2337 | ret = rip_send_packet(STREAM_DATA(s), stream_get_endp(s), to, | |
2338 | ifc); | |
2339 | ||
2340 | if (ret >= 0 && IS_RIP_DEBUG_SEND) | |
2341 | rip_packet_dump((struct rip_packet *)STREAM_DATA(s), | |
2342 | stream_get_endp(s), "SEND"); | |
2343 | stream_reset(s); | |
2344 | } | |
2345 | ||
2346 | /* Statistics updates. */ | |
2347 | ri->sent_updates++; | |
2348 | } | |
2349 | ||
2350 | /* Send RIP packet to the interface. */ | |
2351 | static void rip_update_interface(struct connected *ifc, uint8_t version, | |
2352 | int route_type) | |
2353 | { | |
2354 | struct interface *ifp = ifc->ifp; | |
2355 | struct rip_interface *ri = ifp->info; | |
2356 | struct sockaddr_in to; | |
2357 | ||
2358 | /* When RIP version is 2 and multicast enable interface. */ | |
2359 | if (version == RIPv2 && !ri->v2_broadcast && if_is_multicast(ifp)) { | |
2360 | if (IS_RIP_DEBUG_EVENT) | |
2361 | zlog_debug("multicast announce on %s ", ifp->name); | |
2362 | ||
2363 | rip_output_process(ifc, NULL, route_type, version); | |
2364 | return; | |
2365 | } | |
2366 | ||
2367 | /* If we can't send multicast packet, send it with unicast. */ | |
2368 | if (if_is_broadcast(ifp) || if_is_pointopoint(ifp)) { | |
2369 | if (ifc->address->family == AF_INET) { | |
2370 | /* Destination address and port setting. */ | |
2371 | memset(&to, 0, sizeof(to)); | |
2372 | if (ifc->destination) | |
2373 | /* use specified broadcast or peer destination | |
2374 | * addr */ | |
2375 | to.sin_addr = ifc->destination->u.prefix4; | |
2376 | else if (ifc->address->prefixlen < IPV4_MAX_BITLEN) | |
2377 | /* calculate the appropriate broadcast address | |
2378 | */ | |
2379 | to.sin_addr.s_addr = ipv4_broadcast_addr( | |
2380 | ifc->address->u.prefix4.s_addr, | |
2381 | ifc->address->prefixlen); | |
2382 | else | |
2383 | /* do not know where to send the packet */ | |
2384 | return; | |
2385 | to.sin_port = htons(RIP_PORT_DEFAULT); | |
2386 | ||
2387 | if (IS_RIP_DEBUG_EVENT) | |
2388 | zlog_debug("%s announce to %pI4 on %s", | |
2389 | CONNECTED_PEER(ifc) ? "unicast" | |
2390 | : "broadcast", | |
2391 | &to.sin_addr, ifp->name); | |
2392 | ||
2393 | rip_output_process(ifc, &to, route_type, version); | |
2394 | } | |
2395 | } | |
2396 | } | |
2397 | ||
2398 | /* Update send to all interface and neighbor. */ | |
2399 | static void rip_update_process(struct rip *rip, int route_type) | |
2400 | { | |
2401 | struct listnode *ifnode, *ifnnode; | |
2402 | struct connected *connected; | |
2403 | struct interface *ifp; | |
2404 | struct rip_interface *ri; | |
2405 | struct route_node *rp; | |
2406 | struct sockaddr_in to; | |
2407 | struct prefix *p; | |
2408 | ||
2409 | /* Send RIP update to each interface. */ | |
2410 | FOR_ALL_INTERFACES (rip->vrf, ifp) { | |
2411 | if (if_is_loopback(ifp)) | |
2412 | continue; | |
2413 | ||
2414 | if (!if_is_operative(ifp)) | |
2415 | continue; | |
2416 | ||
2417 | /* Fetch RIP interface information. */ | |
2418 | ri = ifp->info; | |
2419 | ||
2420 | /* When passive interface is specified, suppress announce to the | |
2421 | interface. */ | |
2422 | if (ri->passive) | |
2423 | continue; | |
2424 | ||
2425 | if (!ri->running) | |
2426 | continue; | |
2427 | ||
2428 | /* | |
2429 | * If there is no version configuration in the | |
2430 | * interface, use rip's version setting. | |
2431 | */ | |
2432 | int vsend = ((ri->ri_send == RI_RIP_UNSPEC) ? rip->version_send | |
2433 | : ri->ri_send); | |
2434 | ||
2435 | if (IS_RIP_DEBUG_EVENT) | |
2436 | zlog_debug("SEND UPDATE to %s ifindex %d", ifp->name, | |
2437 | ifp->ifindex); | |
2438 | ||
2439 | /* send update on each connected network */ | |
2440 | for (ALL_LIST_ELEMENTS(ifp->connected, ifnode, ifnnode, | |
2441 | connected)) { | |
2442 | if (connected->address->family == AF_INET) { | |
2443 | if (vsend & RIPv1) | |
2444 | rip_update_interface(connected, RIPv1, | |
2445 | route_type); | |
2446 | if ((vsend & RIPv2) && if_is_multicast(ifp)) | |
2447 | rip_update_interface(connected, RIPv2, | |
2448 | route_type); | |
2449 | } | |
2450 | } | |
2451 | } | |
2452 | ||
2453 | /* RIP send updates to each neighbor. */ | |
2454 | for (rp = route_top(rip->neighbor); rp; rp = route_next(rp)) { | |
2455 | if (rp->info == NULL) | |
2456 | continue; | |
2457 | ||
2458 | p = &rp->p; | |
2459 | ||
2460 | connected = if_lookup_address(&p->u.prefix4, AF_INET, | |
2461 | rip->vrf->vrf_id); | |
2462 | if (!connected) { | |
2463 | zlog_warn( | |
2464 | "Neighbor %pI4 doesn't have connected interface!", | |
2465 | &p->u.prefix4); | |
2466 | continue; | |
2467 | } | |
2468 | ||
2469 | /* Set destination address and port */ | |
2470 | memset(&to, 0, sizeof(struct sockaddr_in)); | |
2471 | to.sin_addr = p->u.prefix4; | |
2472 | to.sin_port = htons(RIP_PORT_DEFAULT); | |
2473 | ||
2474 | /* RIP version is rip's configuration. */ | |
2475 | rip_output_process(connected, &to, route_type, | |
2476 | rip->version_send); | |
2477 | } | |
2478 | } | |
2479 | ||
2480 | /* RIP's periodical timer. */ | |
2481 | static void rip_update(struct event *t) | |
2482 | { | |
2483 | struct rip *rip = EVENT_ARG(t); | |
2484 | ||
2485 | if (IS_RIP_DEBUG_EVENT) | |
2486 | zlog_debug("update timer fire!"); | |
2487 | ||
2488 | /* Process update output. */ | |
2489 | rip_update_process(rip, rip_all_route); | |
2490 | ||
2491 | /* Triggered updates may be suppressed if a regular update is due by | |
2492 | the time the triggered update would be sent. */ | |
2493 | EVENT_OFF(rip->t_triggered_interval); | |
2494 | rip->trigger = 0; | |
2495 | ||
2496 | /* Register myself. */ | |
2497 | rip_event(rip, RIP_UPDATE_EVENT, 0); | |
2498 | } | |
2499 | ||
2500 | /* Walk down the RIP routing table then clear changed flag. */ | |
2501 | static void rip_clear_changed_flag(struct rip *rip) | |
2502 | { | |
2503 | struct route_node *rp; | |
2504 | struct rip_info *rinfo = NULL; | |
2505 | struct list *list = NULL; | |
2506 | struct listnode *listnode = NULL; | |
2507 | ||
2508 | for (rp = route_top(rip->table); rp; rp = route_next(rp)) { | |
2509 | list = rp->info; | |
2510 | ||
2511 | if (list == NULL) | |
2512 | continue; | |
2513 | ||
2514 | for (ALL_LIST_ELEMENTS_RO(list, listnode, rinfo)) { | |
2515 | UNSET_FLAG(rinfo->flags, RIP_RTF_CHANGED); | |
2516 | /* This flag can be set only on the first entry. */ | |
2517 | break; | |
2518 | } | |
2519 | } | |
2520 | } | |
2521 | ||
2522 | /* Triggered update interval timer. */ | |
2523 | static void rip_triggered_interval(struct event *t) | |
2524 | { | |
2525 | struct rip *rip = EVENT_ARG(t); | |
2526 | ||
2527 | if (rip->trigger) { | |
2528 | rip->trigger = 0; | |
2529 | rip_triggered_update(t); | |
2530 | } | |
2531 | } | |
2532 | ||
2533 | /* Execute triggered update. */ | |
2534 | static void rip_triggered_update(struct event *t) | |
2535 | { | |
2536 | struct rip *rip = EVENT_ARG(t); | |
2537 | int interval; | |
2538 | ||
2539 | /* Cancel interval timer. */ | |
2540 | EVENT_OFF(rip->t_triggered_interval); | |
2541 | rip->trigger = 0; | |
2542 | ||
2543 | /* Logging triggered update. */ | |
2544 | if (IS_RIP_DEBUG_EVENT) | |
2545 | zlog_debug("triggered update!"); | |
2546 | ||
2547 | /* Split Horizon processing is done when generating triggered | |
2548 | updates as well as normal updates (see section 2.6). */ | |
2549 | rip_update_process(rip, rip_changed_route); | |
2550 | ||
2551 | /* Once all of the triggered updates have been generated, the route | |
2552 | change flags should be cleared. */ | |
2553 | rip_clear_changed_flag(rip); | |
2554 | ||
2555 | /* After a triggered update is sent, a timer should be set for a | |
2556 | random interval between 1 and 5 seconds. If other changes that | |
2557 | would trigger updates occur before the timer expires, a single | |
2558 | update is triggered when the timer expires. */ | |
2559 | interval = (frr_weak_random() % 5) + 1; | |
2560 | ||
2561 | event_add_timer(master, rip_triggered_interval, rip, interval, | |
2562 | &rip->t_triggered_interval); | |
2563 | } | |
2564 | ||
2565 | /* Withdraw redistributed route. */ | |
2566 | void rip_redistribute_withdraw(struct rip *rip, int type) | |
2567 | { | |
2568 | struct route_node *rp; | |
2569 | struct rip_info *rinfo = NULL; | |
2570 | struct list *list = NULL; | |
2571 | ||
2572 | for (rp = route_top(rip->table); rp; rp = route_next(rp)) { | |
2573 | list = rp->info; | |
2574 | ||
2575 | if (list == NULL) | |
2576 | continue; | |
2577 | ||
2578 | rinfo = listgetdata(listhead(list)); | |
2579 | ||
2580 | if (rinfo->type != type) | |
2581 | continue; | |
2582 | ||
2583 | if (rinfo->sub_type == RIP_ROUTE_INTERFACE) | |
2584 | continue; | |
2585 | ||
2586 | /* Perform poisoned reverse. */ | |
2587 | rinfo->metric = RIP_METRIC_INFINITY; | |
2588 | RIP_TIMER_ON(rinfo->t_garbage_collect, rip_garbage_collect, | |
2589 | rip->garbage_time); | |
2590 | EVENT_OFF(rinfo->t_timeout); | |
2591 | rinfo->flags |= RIP_RTF_CHANGED; | |
2592 | ||
2593 | if (IS_RIP_DEBUG_EVENT) { | |
2594 | struct prefix_ipv4 *p = (struct prefix_ipv4 *)&rp->p; | |
2595 | ||
2596 | zlog_debug( | |
2597 | "Poisone %pFX on the interface %s with an infinity metric [withdraw]", | |
2598 | p, | |
2599 | ifindex2ifname(rinfo->nh.ifindex, | |
2600 | rip->vrf->vrf_id)); | |
2601 | } | |
2602 | ||
2603 | rip_event(rip, RIP_TRIGGERED_UPDATE, 0); | |
2604 | } | |
2605 | } | |
2606 | ||
2607 | struct rip *rip_lookup_by_vrf_id(vrf_id_t vrf_id) | |
2608 | { | |
2609 | struct vrf *vrf; | |
2610 | ||
2611 | vrf = vrf_lookup_by_id(vrf_id); | |
2612 | if (!vrf) | |
2613 | return NULL; | |
2614 | ||
2615 | return vrf->info; | |
2616 | } | |
2617 | ||
2618 | struct rip *rip_lookup_by_vrf_name(const char *vrf_name) | |
2619 | { | |
2620 | struct rip rip; | |
2621 | ||
2622 | rip.vrf_name = (char *)vrf_name; | |
2623 | ||
2624 | return RB_FIND(rip_instance_head, &rip_instances, &rip); | |
2625 | } | |
2626 | ||
2627 | /* Create new RIP instance and set it to global variable. */ | |
2628 | struct rip *rip_create(const char *vrf_name, struct vrf *vrf, int socket) | |
2629 | { | |
2630 | struct rip *rip; | |
2631 | ||
2632 | rip = XCALLOC(MTYPE_RIP, sizeof(struct rip)); | |
2633 | rip->vrf_name = XSTRDUP(MTYPE_RIP_VRF_NAME, vrf_name); | |
2634 | ||
2635 | /* Set initial value. */ | |
2636 | rip->ecmp = yang_get_default_bool("%s/allow-ecmp", RIP_INSTANCE); | |
2637 | rip->default_metric = | |
2638 | yang_get_default_uint8("%s/default-metric", RIP_INSTANCE); | |
2639 | rip->distance = | |
2640 | yang_get_default_uint8("%s/distance/default", RIP_INSTANCE); | |
2641 | rip->passive_default = | |
2642 | yang_get_default_bool("%s/passive-default", RIP_INSTANCE); | |
2643 | rip->garbage_time = yang_get_default_uint32("%s/timers/flush-interval", | |
2644 | RIP_INSTANCE); | |
2645 | rip->timeout_time = yang_get_default_uint32( | |
2646 | "%s/timers/holddown-interval", RIP_INSTANCE); | |
2647 | rip->update_time = yang_get_default_uint32("%s/timers/update-interval", | |
2648 | RIP_INSTANCE); | |
2649 | rip->version_send = | |
2650 | yang_get_default_enum("%s/version/send", RIP_INSTANCE); | |
2651 | rip->version_recv = | |
2652 | yang_get_default_enum("%s/version/receive", RIP_INSTANCE); | |
2653 | ||
2654 | /* Initialize RIP data structures. */ | |
2655 | rip->table = route_table_init(); | |
2656 | route_table_set_info(rip->table, rip); | |
2657 | rip->neighbor = route_table_init(); | |
2658 | rip->peer_list = list_new(); | |
2659 | rip->peer_list->cmp = (int (*)(void *, void *))rip_peer_list_cmp; | |
2660 | rip->peer_list->del = rip_peer_list_del; | |
2661 | rip->distance_table = route_table_init(); | |
2662 | rip->distance_table->cleanup = rip_distance_table_node_cleanup; | |
2663 | rip->enable_interface = vector_init(1); | |
2664 | rip->enable_network = route_table_init(); | |
2665 | rip->passive_nondefault = vector_init(1); | |
2666 | rip->offset_list_master = list_new(); | |
2667 | rip->offset_list_master->cmp = (int (*)(void *, void *))offset_list_cmp; | |
2668 | rip->offset_list_master->del = (void (*)(void *))offset_list_free; | |
2669 | ||
2670 | /* Distribute list install. */ | |
2671 | rip->distribute_ctx = distribute_list_ctx_create(vrf); | |
2672 | distribute_list_add_hook(rip->distribute_ctx, rip_distribute_update); | |
2673 | distribute_list_delete_hook(rip->distribute_ctx, rip_distribute_update); | |
2674 | ||
2675 | /* if rmap install. */ | |
2676 | rip->if_rmap_ctx = if_rmap_ctx_create(vrf_name); | |
2677 | if_rmap_hook_add(rip->if_rmap_ctx, rip_if_rmap_update); | |
2678 | if_rmap_hook_delete(rip->if_rmap_ctx, rip_if_rmap_update); | |
2679 | ||
2680 | /* Make output stream. */ | |
2681 | rip->obuf = stream_new(1500); | |
2682 | ||
2683 | /* Enable the routing instance if possible. */ | |
2684 | if (vrf && vrf_is_enabled(vrf)) | |
2685 | rip_instance_enable(rip, vrf, socket); | |
2686 | else { | |
2687 | rip->vrf = NULL; | |
2688 | rip->sock = -1; | |
2689 | } | |
2690 | ||
2691 | RB_INSERT(rip_instance_head, &rip_instances, rip); | |
2692 | ||
2693 | return rip; | |
2694 | } | |
2695 | ||
2696 | /* Sned RIP request to the destination. */ | |
2697 | int rip_request_send(struct sockaddr_in *to, struct interface *ifp, | |
2698 | uint8_t version, struct connected *connected) | |
2699 | { | |
2700 | struct rte *rte; | |
2701 | struct rip_packet rip_packet; | |
2702 | struct listnode *node, *nnode; | |
2703 | ||
2704 | memset(&rip_packet, 0, sizeof(rip_packet)); | |
2705 | ||
2706 | rip_packet.command = RIP_REQUEST; | |
2707 | rip_packet.version = version; | |
2708 | rte = rip_packet.rte; | |
2709 | rte->metric = htonl(RIP_METRIC_INFINITY); | |
2710 | ||
2711 | if (connected) { | |
2712 | /* | |
2713 | * connected is only sent for ripv1 case, or when | |
2714 | * interface does not support multicast. Caller loops | |
2715 | * over each connected address for this case. | |
2716 | */ | |
2717 | if (rip_send_packet((uint8_t *)&rip_packet, sizeof(rip_packet), | |
2718 | to, connected) | |
2719 | != sizeof(rip_packet)) | |
2720 | return -1; | |
2721 | else | |
2722 | return sizeof(rip_packet); | |
2723 | } | |
2724 | ||
2725 | /* send request on each connected network */ | |
2726 | for (ALL_LIST_ELEMENTS(ifp->connected, node, nnode, connected)) { | |
2727 | struct prefix_ipv4 *p; | |
2728 | ||
2729 | p = (struct prefix_ipv4 *)connected->address; | |
2730 | ||
2731 | if (p->family != AF_INET) | |
2732 | continue; | |
2733 | ||
2734 | if (rip_send_packet((uint8_t *)&rip_packet, sizeof(rip_packet), | |
2735 | to, connected) | |
2736 | != sizeof(rip_packet)) | |
2737 | return -1; | |
2738 | } | |
2739 | return sizeof(rip_packet); | |
2740 | } | |
2741 | ||
2742 | static int rip_update_jitter(unsigned long time) | |
2743 | { | |
2744 | #define JITTER_BOUND 4 | |
2745 | /* We want to get the jitter to +/- 1/JITTER_BOUND the interval. | |
2746 | Given that, we cannot let time be less than JITTER_BOUND seconds. | |
2747 | The RIPv2 RFC says jitter should be small compared to | |
2748 | update_time. We consider 1/JITTER_BOUND to be small. | |
2749 | */ | |
2750 | ||
2751 | int jitter_input = time; | |
2752 | int jitter; | |
2753 | ||
2754 | if (jitter_input < JITTER_BOUND) | |
2755 | jitter_input = JITTER_BOUND; | |
2756 | ||
2757 | jitter = (((frr_weak_random() % ((jitter_input * 2) + 1)) | |
2758 | - jitter_input)); | |
2759 | ||
2760 | return jitter / JITTER_BOUND; | |
2761 | } | |
2762 | ||
2763 | void rip_event(struct rip *rip, enum rip_event event, int sock) | |
2764 | { | |
2765 | int jitter = 0; | |
2766 | ||
2767 | switch (event) { | |
2768 | case RIP_READ: | |
2769 | event_add_read(master, rip_read, rip, sock, &rip->t_read); | |
2770 | break; | |
2771 | case RIP_UPDATE_EVENT: | |
2772 | EVENT_OFF(rip->t_update); | |
2773 | jitter = rip_update_jitter(rip->update_time); | |
2774 | event_add_timer(master, rip_update, rip, | |
2775 | sock ? 2 : rip->update_time + jitter, | |
2776 | &rip->t_update); | |
2777 | break; | |
2778 | case RIP_TRIGGERED_UPDATE: | |
2779 | if (rip->t_triggered_interval) | |
2780 | rip->trigger = 1; | |
2781 | else | |
2782 | event_add_event(master, rip_triggered_update, rip, 0, | |
2783 | &rip->t_triggered_update); | |
2784 | break; | |
2785 | default: | |
2786 | break; | |
2787 | } | |
2788 | } | |
2789 | ||
2790 | struct rip_distance *rip_distance_new(void) | |
2791 | { | |
2792 | return XCALLOC(MTYPE_RIP_DISTANCE, sizeof(struct rip_distance)); | |
2793 | } | |
2794 | ||
2795 | void rip_distance_free(struct rip_distance *rdistance) | |
2796 | { | |
2797 | if (rdistance->access_list) | |
2798 | free(rdistance->access_list); | |
2799 | XFREE(MTYPE_RIP_DISTANCE, rdistance); | |
2800 | } | |
2801 | ||
2802 | static void rip_distance_table_node_cleanup(struct route_table *table, | |
2803 | struct route_node *node) | |
2804 | { | |
2805 | struct rip_distance *rdistance; | |
2806 | ||
2807 | rdistance = node->info; | |
2808 | if (rdistance) | |
2809 | rip_distance_free(rdistance); | |
2810 | } | |
2811 | ||
2812 | /* Apply RIP information to distance method. */ | |
2813 | uint8_t rip_distance_apply(struct rip *rip, struct rip_info *rinfo) | |
2814 | { | |
2815 | struct route_node *rn; | |
2816 | struct prefix_ipv4 p; | |
2817 | struct rip_distance *rdistance; | |
2818 | struct access_list *alist; | |
2819 | ||
2820 | memset(&p, 0, sizeof(p)); | |
2821 | p.family = AF_INET; | |
2822 | p.prefix = rinfo->from; | |
2823 | p.prefixlen = IPV4_MAX_BITLEN; | |
2824 | ||
2825 | /* Check source address. */ | |
2826 | rn = route_node_match(rip->distance_table, (struct prefix *)&p); | |
2827 | if (rn) { | |
2828 | rdistance = rn->info; | |
2829 | route_unlock_node(rn); | |
2830 | ||
2831 | if (rdistance->access_list) { | |
2832 | alist = access_list_lookup(AFI_IP, | |
2833 | rdistance->access_list); | |
2834 | if (alist == NULL) | |
2835 | return 0; | |
2836 | if (access_list_apply(alist, &rinfo->rp->p) | |
2837 | == FILTER_DENY) | |
2838 | return 0; | |
2839 | } | |
2840 | return rdistance->distance; | |
2841 | } | |
2842 | ||
2843 | return rip->distance; | |
2844 | } | |
2845 | ||
2846 | static void rip_distance_show(struct vty *vty, struct rip *rip) | |
2847 | { | |
2848 | struct route_node *rn; | |
2849 | struct rip_distance *rdistance; | |
2850 | int header = 1; | |
2851 | char buf[BUFSIZ]; | |
2852 | ||
2853 | vty_out(vty, " Distance: (default is %u)\n", | |
2854 | rip->distance ? rip->distance : ZEBRA_RIP_DISTANCE_DEFAULT); | |
2855 | ||
2856 | for (rn = route_top(rip->distance_table); rn; rn = route_next(rn)) { | |
2857 | rdistance = rn->info; | |
2858 | ||
2859 | if (rdistance == NULL) | |
2860 | continue; | |
2861 | ||
2862 | if (header) { | |
2863 | vty_out(vty, " Address Distance List\n"); | |
2864 | header = 0; | |
2865 | } | |
2866 | snprintfrr(buf, sizeof(buf), "%pFX", &rn->p); | |
2867 | vty_out(vty, " %-20s %4d %s\n", buf, rdistance->distance, | |
2868 | rdistance->access_list ? rdistance->access_list : ""); | |
2869 | } | |
2870 | } | |
2871 | ||
2872 | /* Update ECMP routes to zebra when ECMP is disabled. */ | |
2873 | void rip_ecmp_disable(struct rip *rip) | |
2874 | { | |
2875 | struct route_node *rp; | |
2876 | struct rip_info *rinfo, *tmp_rinfo; | |
2877 | struct list *list; | |
2878 | struct listnode *node, *nextnode; | |
2879 | ||
2880 | for (rp = route_top(rip->table); rp; rp = route_next(rp)) { | |
2881 | list = rp->info; | |
2882 | ||
2883 | if (!list) | |
2884 | continue; | |
2885 | if (listcount(list) == 0) | |
2886 | continue; | |
2887 | ||
2888 | rinfo = listgetdata(listhead(list)); | |
2889 | if (!rip_route_rte(rinfo)) | |
2890 | continue; | |
2891 | ||
2892 | /* Drop all other entries, except the first one. */ | |
2893 | for (ALL_LIST_ELEMENTS(list, node, nextnode, tmp_rinfo)) { | |
2894 | if (tmp_rinfo == rinfo) | |
2895 | continue; | |
2896 | ||
2897 | EVENT_OFF(tmp_rinfo->t_timeout); | |
2898 | EVENT_OFF(tmp_rinfo->t_garbage_collect); | |
2899 | list_delete_node(list, node); | |
2900 | rip_info_free(tmp_rinfo); | |
2901 | } | |
2902 | ||
2903 | /* Update zebra. */ | |
2904 | rip_zebra_ipv4_add(rip, rp); | |
2905 | ||
2906 | /* Set the route change flag. */ | |
2907 | SET_FLAG(rinfo->flags, RIP_RTF_CHANGED); | |
2908 | ||
2909 | /* Signal the output process to trigger an update. */ | |
2910 | rip_event(rip, RIP_TRIGGERED_UPDATE, 0); | |
2911 | } | |
2912 | } | |
2913 | ||
2914 | /* Print out routes update time. */ | |
2915 | static void rip_vty_out_uptime(struct vty *vty, struct rip_info *rinfo) | |
2916 | { | |
2917 | time_t clock; | |
2918 | struct tm tm; | |
2919 | #define TIME_BUF 25 | |
2920 | char timebuf[TIME_BUF]; | |
2921 | struct event *thread; | |
2922 | ||
2923 | if ((thread = rinfo->t_timeout) != NULL) { | |
2924 | clock = event_timer_remain_second(thread); | |
2925 | gmtime_r(&clock, &tm); | |
2926 | strftime(timebuf, TIME_BUF, "%M:%S", &tm); | |
2927 | vty_out(vty, "%5s", timebuf); | |
2928 | } else if ((thread = rinfo->t_garbage_collect) != NULL) { | |
2929 | clock = event_timer_remain_second(thread); | |
2930 | gmtime_r(&clock, &tm); | |
2931 | strftime(timebuf, TIME_BUF, "%M:%S", &tm); | |
2932 | vty_out(vty, "%5s", timebuf); | |
2933 | } | |
2934 | } | |
2935 | ||
2936 | static const char *rip_route_type_print(int sub_type) | |
2937 | { | |
2938 | switch (sub_type) { | |
2939 | case RIP_ROUTE_RTE: | |
2940 | return "n"; | |
2941 | case RIP_ROUTE_STATIC: | |
2942 | return "s"; | |
2943 | case RIP_ROUTE_DEFAULT: | |
2944 | return "d"; | |
2945 | case RIP_ROUTE_REDISTRIBUTE: | |
2946 | return "r"; | |
2947 | case RIP_ROUTE_INTERFACE: | |
2948 | return "i"; | |
2949 | default: | |
2950 | return "?"; | |
2951 | } | |
2952 | } | |
2953 | ||
2954 | DEFUN (show_ip_rip, | |
2955 | show_ip_rip_cmd, | |
2956 | "show ip rip [vrf NAME]", | |
2957 | SHOW_STR | |
2958 | IP_STR | |
2959 | "Show RIP routes\n" | |
2960 | VRF_CMD_HELP_STR) | |
2961 | { | |
2962 | struct rip *rip; | |
2963 | struct route_node *np; | |
2964 | struct rip_info *rinfo = NULL; | |
2965 | struct list *list = NULL; | |
2966 | struct listnode *listnode = NULL; | |
2967 | const char *vrf_name; | |
2968 | int idx = 0; | |
2969 | ||
2970 | if (argv_find(argv, argc, "vrf", &idx)) | |
2971 | vrf_name = argv[idx + 1]->arg; | |
2972 | else | |
2973 | vrf_name = VRF_DEFAULT_NAME; | |
2974 | ||
2975 | rip = rip_lookup_by_vrf_name(vrf_name); | |
2976 | if (!rip) { | |
2977 | vty_out(vty, "%% RIP instance not found\n"); | |
2978 | return CMD_SUCCESS; | |
2979 | } | |
2980 | if (!rip->enabled) { | |
2981 | vty_out(vty, "%% RIP instance is disabled\n"); | |
2982 | return CMD_SUCCESS; | |
2983 | } | |
2984 | ||
2985 | vty_out(vty, | |
2986 | "Codes: R - RIP, C - connected, S - Static, O - OSPF, B - BGP\n" | |
2987 | "Sub-codes:\n" | |
2988 | " (n) - normal, (s) - static, (d) - default, (r) - redistribute,\n" | |
2989 | " (i) - interface\n\n" | |
2990 | " Network Next Hop Metric From Tag Time\n"); | |
2991 | ||
2992 | for (np = route_top(rip->table); np; np = route_next(np)) { | |
2993 | list = np->info; | |
2994 | ||
2995 | if (!list) | |
2996 | continue; | |
2997 | ||
2998 | for (ALL_LIST_ELEMENTS_RO(list, listnode, rinfo)) { | |
2999 | int len; | |
3000 | ||
3001 | len = vty_out(vty, "%c(%s) %pFX", | |
3002 | /* np->lock, For debugging. */ | |
3003 | zebra_route_char(rinfo->type), | |
3004 | rip_route_type_print(rinfo->sub_type), | |
3005 | &np->p); | |
3006 | ||
3007 | len = 24 - len; | |
3008 | ||
3009 | if (len > 0) | |
3010 | vty_out(vty, "%*s", len, " "); | |
3011 | ||
3012 | switch (rinfo->nh.type) { | |
3013 | case NEXTHOP_TYPE_IPV4: | |
3014 | case NEXTHOP_TYPE_IPV4_IFINDEX: | |
3015 | vty_out(vty, "%-20pI4 %2d ", | |
3016 | &rinfo->nh.gate.ipv4, rinfo->metric); | |
3017 | break; | |
3018 | case NEXTHOP_TYPE_IFINDEX: | |
3019 | vty_out(vty, "0.0.0.0 %2d ", | |
3020 | rinfo->metric); | |
3021 | break; | |
3022 | case NEXTHOP_TYPE_BLACKHOLE: | |
3023 | vty_out(vty, "blackhole %2d ", | |
3024 | rinfo->metric); | |
3025 | break; | |
3026 | case NEXTHOP_TYPE_IPV6: | |
3027 | case NEXTHOP_TYPE_IPV6_IFINDEX: | |
3028 | vty_out(vty, "V6 Address Hidden %2d ", | |
3029 | rinfo->metric); | |
3030 | break; | |
3031 | } | |
3032 | ||
3033 | /* Route which exist in kernel routing table. */ | |
3034 | if ((rinfo->type == ZEBRA_ROUTE_RIP) && | |
3035 | (rinfo->sub_type == RIP_ROUTE_RTE)) { | |
3036 | vty_out(vty, "%-15pI4 ", &rinfo->from); | |
3037 | vty_out(vty, "%3" ROUTE_TAG_PRI " ", | |
3038 | (route_tag_t)rinfo->tag); | |
3039 | rip_vty_out_uptime(vty, rinfo); | |
3040 | } else if (rinfo->metric == RIP_METRIC_INFINITY) { | |
3041 | vty_out(vty, "self "); | |
3042 | vty_out(vty, "%3" ROUTE_TAG_PRI " ", | |
3043 | (route_tag_t)rinfo->tag); | |
3044 | rip_vty_out_uptime(vty, rinfo); | |
3045 | } else { | |
3046 | if (rinfo->external_metric) { | |
3047 | len = vty_out( | |
3048 | vty, "self (%s:%d)", | |
3049 | zebra_route_string(rinfo->type), | |
3050 | rinfo->external_metric); | |
3051 | len = 16 - len; | |
3052 | if (len > 0) | |
3053 | vty_out(vty, "%*s", len, " "); | |
3054 | } else | |
3055 | vty_out(vty, "self "); | |
3056 | vty_out(vty, "%3" ROUTE_TAG_PRI, | |
3057 | (route_tag_t)rinfo->tag); | |
3058 | } | |
3059 | ||
3060 | vty_out(vty, "\n"); | |
3061 | } | |
3062 | } | |
3063 | return CMD_SUCCESS; | |
3064 | } | |
3065 | ||
3066 | /* Vincent: formerly, it was show_ip_protocols_rip: "show ip protocols" */ | |
3067 | DEFUN (show_ip_rip_status, | |
3068 | show_ip_rip_status_cmd, | |
3069 | "show ip rip [vrf NAME] status", | |
3070 | SHOW_STR | |
3071 | IP_STR | |
3072 | "Show RIP routes\n" | |
3073 | VRF_CMD_HELP_STR | |
3074 | "IP routing protocol process parameters and statistics\n") | |
3075 | { | |
3076 | struct rip *rip; | |
3077 | struct interface *ifp; | |
3078 | struct rip_interface *ri; | |
3079 | extern const struct message ri_version_msg[]; | |
3080 | const char *send_version; | |
3081 | const char *receive_version; | |
3082 | const char *vrf_name; | |
3083 | int idx = 0; | |
3084 | ||
3085 | if (argv_find(argv, argc, "vrf", &idx)) | |
3086 | vrf_name = argv[idx + 1]->arg; | |
3087 | else | |
3088 | vrf_name = VRF_DEFAULT_NAME; | |
3089 | ||
3090 | rip = rip_lookup_by_vrf_name(vrf_name); | |
3091 | if (!rip) { | |
3092 | vty_out(vty, "%% RIP instance not found\n"); | |
3093 | return CMD_SUCCESS; | |
3094 | } | |
3095 | if (!rip->enabled) { | |
3096 | vty_out(vty, "%% RIP instance is disabled\n"); | |
3097 | return CMD_SUCCESS; | |
3098 | } | |
3099 | ||
3100 | vty_out(vty, "Routing Protocol is \"rip\"\n"); | |
3101 | vty_out(vty, " Sending updates every %u seconds with +/-50%%,", | |
3102 | rip->update_time); | |
3103 | vty_out(vty, " next due in %lu seconds\n", | |
3104 | event_timer_remain_second(rip->t_update)); | |
3105 | vty_out(vty, " Timeout after %u seconds,", rip->timeout_time); | |
3106 | vty_out(vty, " garbage collect after %u seconds\n", rip->garbage_time); | |
3107 | ||
3108 | /* Filtering status show. */ | |
3109 | config_show_distribute(vty, rip->distribute_ctx); | |
3110 | ||
3111 | /* Default metric information. */ | |
3112 | vty_out(vty, " Default redistribution metric is %u\n", | |
3113 | rip->default_metric); | |
3114 | ||
3115 | /* Redistribute information. */ | |
3116 | vty_out(vty, " Redistributing:"); | |
3117 | rip_show_redistribute_config(vty, rip); | |
3118 | vty_out(vty, "\n"); | |
3119 | ||
3120 | vty_out(vty, " Default version control: send version %s,", | |
3121 | lookup_msg(ri_version_msg, rip->version_send, NULL)); | |
3122 | if (rip->version_recv == RI_RIP_VERSION_1_AND_2) | |
3123 | vty_out(vty, " receive any version \n"); | |
3124 | else | |
3125 | vty_out(vty, " receive version %s \n", | |
3126 | lookup_msg(ri_version_msg, rip->version_recv, NULL)); | |
3127 | ||
3128 | vty_out(vty, " Interface Send Recv Key-chain\n"); | |
3129 | ||
3130 | FOR_ALL_INTERFACES (rip->vrf, ifp) { | |
3131 | ri = ifp->info; | |
3132 | ||
3133 | if (!ri->running) | |
3134 | continue; | |
3135 | ||
3136 | if (ri->enable_network || ri->enable_interface) { | |
3137 | if (ri->ri_send == RI_RIP_UNSPEC) | |
3138 | send_version = | |
3139 | lookup_msg(ri_version_msg, | |
3140 | rip->version_send, NULL); | |
3141 | else | |
3142 | send_version = lookup_msg(ri_version_msg, | |
3143 | ri->ri_send, NULL); | |
3144 | ||
3145 | if (ri->ri_receive == RI_RIP_UNSPEC) | |
3146 | receive_version = | |
3147 | lookup_msg(ri_version_msg, | |
3148 | rip->version_recv, NULL); | |
3149 | else | |
3150 | receive_version = lookup_msg( | |
3151 | ri_version_msg, ri->ri_receive, NULL); | |
3152 | ||
3153 | vty_out(vty, " %-17s%-3s %-3s %s\n", ifp->name, | |
3154 | send_version, receive_version, | |
3155 | ri->key_chain ? ri->key_chain : ""); | |
3156 | } | |
3157 | } | |
3158 | ||
3159 | vty_out(vty, " Routing for Networks:\n"); | |
3160 | rip_show_network_config(vty, rip); | |
3161 | ||
3162 | int found_passive = 0; | |
3163 | FOR_ALL_INTERFACES (rip->vrf, ifp) { | |
3164 | ri = ifp->info; | |
3165 | ||
3166 | if ((ri->enable_network || ri->enable_interface) && | |
3167 | ri->passive) { | |
3168 | if (!found_passive) { | |
3169 | vty_out(vty, " Passive Interface(s):\n"); | |
3170 | found_passive = 1; | |
3171 | } | |
3172 | vty_out(vty, " %s\n", ifp->name); | |
3173 | } | |
3174 | } | |
3175 | ||
3176 | vty_out(vty, " Routing Information Sources:\n"); | |
3177 | vty_out(vty, | |
3178 | " Gateway BadPackets BadRoutes Distance Last Update\n"); | |
3179 | rip_peer_display(vty, rip); | |
3180 | ||
3181 | rip_distance_show(vty, rip); | |
3182 | ||
3183 | return CMD_SUCCESS; | |
3184 | } | |
3185 | ||
3186 | /* RIP configuration write function. */ | |
3187 | static int config_write_rip(struct vty *vty) | |
3188 | { | |
3189 | struct rip *rip; | |
3190 | int write = 0; | |
3191 | ||
3192 | RB_FOREACH(rip, rip_instance_head, &rip_instances) { | |
3193 | char xpath[XPATH_MAXLEN]; | |
3194 | struct lyd_node *dnode; | |
3195 | ||
3196 | snprintf(xpath, sizeof(xpath), | |
3197 | "/frr-ripd:ripd/instance[vrf='%s']", rip->vrf_name); | |
3198 | ||
3199 | dnode = yang_dnode_get(running_config->dnode, xpath); | |
3200 | assert(dnode); | |
3201 | ||
3202 | nb_cli_show_dnode_cmds(vty, dnode, false); | |
3203 | ||
3204 | /* Distribute configuration. */ | |
3205 | config_write_distribute(vty, rip->distribute_ctx); | |
3206 | ||
3207 | /* Interface routemap configuration */ | |
3208 | config_write_if_rmap(vty, rip->if_rmap_ctx); | |
3209 | ||
3210 | vty_out(vty, "exit\n"); | |
3211 | ||
3212 | write = 1; | |
3213 | } | |
3214 | ||
3215 | return write; | |
3216 | } | |
3217 | ||
3218 | static int config_write_rip(struct vty *vty); | |
3219 | /* RIP node structure. */ | |
3220 | static struct cmd_node rip_node = { | |
3221 | .name = "rip", | |
3222 | .node = RIP_NODE, | |
3223 | .parent_node = CONFIG_NODE, | |
3224 | .prompt = "%s(config-router)# ", | |
3225 | .config_write = config_write_rip, | |
3226 | }; | |
3227 | ||
3228 | /* Distribute-list update functions. */ | |
3229 | static void rip_distribute_update(struct distribute_ctx *ctx, | |
3230 | struct distribute *dist) | |
3231 | { | |
3232 | struct interface *ifp; | |
3233 | struct rip_interface *ri; | |
3234 | struct access_list *alist; | |
3235 | struct prefix_list *plist; | |
3236 | ||
3237 | if (!ctx->vrf || !dist->ifname) | |
3238 | return; | |
3239 | ||
3240 | ifp = if_lookup_by_name(dist->ifname, ctx->vrf->vrf_id); | |
3241 | if (ifp == NULL) | |
3242 | return; | |
3243 | ||
3244 | ri = ifp->info; | |
3245 | ||
3246 | if (dist->list[DISTRIBUTE_V4_IN]) { | |
3247 | alist = access_list_lookup(AFI_IP, | |
3248 | dist->list[DISTRIBUTE_V4_IN]); | |
3249 | if (alist) | |
3250 | ri->list[RIP_FILTER_IN] = alist; | |
3251 | else | |
3252 | ri->list[RIP_FILTER_IN] = NULL; | |
3253 | } else | |
3254 | ri->list[RIP_FILTER_IN] = NULL; | |
3255 | ||
3256 | if (dist->list[DISTRIBUTE_V4_OUT]) { | |
3257 | alist = access_list_lookup(AFI_IP, | |
3258 | dist->list[DISTRIBUTE_V4_OUT]); | |
3259 | if (alist) | |
3260 | ri->list[RIP_FILTER_OUT] = alist; | |
3261 | else | |
3262 | ri->list[RIP_FILTER_OUT] = NULL; | |
3263 | } else | |
3264 | ri->list[RIP_FILTER_OUT] = NULL; | |
3265 | ||
3266 | if (dist->prefix[DISTRIBUTE_V4_IN]) { | |
3267 | plist = prefix_list_lookup(AFI_IP, | |
3268 | dist->prefix[DISTRIBUTE_V4_IN]); | |
3269 | if (plist) | |
3270 | ri->prefix[RIP_FILTER_IN] = plist; | |
3271 | else | |
3272 | ri->prefix[RIP_FILTER_IN] = NULL; | |
3273 | } else | |
3274 | ri->prefix[RIP_FILTER_IN] = NULL; | |
3275 | ||
3276 | if (dist->prefix[DISTRIBUTE_V4_OUT]) { | |
3277 | plist = prefix_list_lookup(AFI_IP, | |
3278 | dist->prefix[DISTRIBUTE_V4_OUT]); | |
3279 | if (plist) | |
3280 | ri->prefix[RIP_FILTER_OUT] = plist; | |
3281 | else | |
3282 | ri->prefix[RIP_FILTER_OUT] = NULL; | |
3283 | } else | |
3284 | ri->prefix[RIP_FILTER_OUT] = NULL; | |
3285 | } | |
3286 | ||
3287 | void rip_distribute_update_interface(struct interface *ifp) | |
3288 | { | |
3289 | struct rip_interface *ri = ifp->info; | |
3290 | struct rip *rip = ri->rip; | |
3291 | struct distribute *dist; | |
3292 | ||
3293 | if (!rip) | |
3294 | return; | |
3295 | dist = distribute_lookup(rip->distribute_ctx, ifp->name); | |
3296 | if (dist) | |
3297 | rip_distribute_update(rip->distribute_ctx, dist); | |
3298 | } | |
3299 | ||
3300 | /* Update all interface's distribute list. */ | |
3301 | /* ARGSUSED */ | |
3302 | static void rip_distribute_update_all(struct prefix_list *notused) | |
3303 | { | |
3304 | struct vrf *vrf = vrf_lookup_by_id(VRF_DEFAULT); | |
3305 | struct interface *ifp; | |
3306 | ||
3307 | FOR_ALL_INTERFACES (vrf, ifp) | |
3308 | rip_distribute_update_interface(ifp); | |
3309 | } | |
3310 | /* ARGSUSED */ | |
3311 | static void rip_distribute_update_all_wrapper(struct access_list *notused) | |
3312 | { | |
3313 | rip_distribute_update_all(NULL); | |
3314 | } | |
3315 | ||
3316 | /* Delete all added rip route. */ | |
3317 | void rip_clean(struct rip *rip) | |
3318 | { | |
3319 | rip_interfaces_clean(rip); | |
3320 | ||
3321 | if (rip->enabled) | |
3322 | rip_instance_disable(rip); | |
3323 | ||
3324 | stream_free(rip->obuf); | |
3325 | ||
3326 | for (int i = 0; i < ZEBRA_ROUTE_MAX; i++) | |
3327 | if (rip->redist[i].route_map.name) | |
3328 | free(rip->redist[i].route_map.name); | |
3329 | ||
3330 | route_table_finish(rip->table); | |
3331 | route_table_finish(rip->neighbor); | |
3332 | list_delete(&rip->peer_list); | |
3333 | distribute_list_delete(&rip->distribute_ctx); | |
3334 | if_rmap_ctx_delete(rip->if_rmap_ctx); | |
3335 | ||
3336 | rip_clean_network(rip); | |
3337 | rip_passive_nondefault_clean(rip); | |
3338 | vector_free(rip->enable_interface); | |
3339 | route_table_finish(rip->enable_network); | |
3340 | vector_free(rip->passive_nondefault); | |
3341 | list_delete(&rip->offset_list_master); | |
3342 | route_table_finish(rip->distance_table); | |
3343 | ||
3344 | RB_REMOVE(rip_instance_head, &rip_instances, rip); | |
3345 | XFREE(MTYPE_RIP_VRF_NAME, rip->vrf_name); | |
3346 | XFREE(MTYPE_RIP, rip); | |
3347 | } | |
3348 | ||
3349 | static void rip_if_rmap_update(struct if_rmap_ctx *ctx, | |
3350 | struct if_rmap *if_rmap) | |
3351 | { | |
3352 | struct interface *ifp = NULL; | |
3353 | struct rip_interface *ri; | |
3354 | struct route_map *rmap; | |
3355 | struct vrf *vrf = NULL; | |
3356 | ||
3357 | if (ctx->name) | |
3358 | vrf = vrf_lookup_by_name(ctx->name); | |
3359 | if (vrf) | |
3360 | ifp = if_lookup_by_name(if_rmap->ifname, vrf->vrf_id); | |
3361 | if (ifp == NULL) | |
3362 | return; | |
3363 | ||
3364 | ri = ifp->info; | |
3365 | if (if_rmap->routemap[IF_RMAP_IN]) { | |
3366 | rmap = route_map_lookup_by_name(if_rmap->routemap[IF_RMAP_IN]); | |
3367 | if (rmap) | |
3368 | ri->routemap[IF_RMAP_IN] = rmap; | |
3369 | else | |
3370 | ri->routemap[IF_RMAP_IN] = NULL; | |
3371 | } else | |
3372 | ri->routemap[RIP_FILTER_IN] = NULL; | |
3373 | ||
3374 | if (if_rmap->routemap[IF_RMAP_OUT]) { | |
3375 | rmap = route_map_lookup_by_name(if_rmap->routemap[IF_RMAP_OUT]); | |
3376 | if (rmap) | |
3377 | ri->routemap[IF_RMAP_OUT] = rmap; | |
3378 | else | |
3379 | ri->routemap[IF_RMAP_OUT] = NULL; | |
3380 | } else | |
3381 | ri->routemap[RIP_FILTER_OUT] = NULL; | |
3382 | } | |
3383 | ||
3384 | void rip_if_rmap_update_interface(struct interface *ifp) | |
3385 | { | |
3386 | struct rip_interface *ri = ifp->info; | |
3387 | struct rip *rip = ri->rip; | |
3388 | struct if_rmap *if_rmap; | |
3389 | struct if_rmap_ctx *ctx; | |
3390 | ||
3391 | if (!rip) | |
3392 | return; | |
3393 | ctx = rip->if_rmap_ctx; | |
3394 | if (!ctx) | |
3395 | return; | |
3396 | if_rmap = if_rmap_lookup(ctx, ifp->name); | |
3397 | if (if_rmap) | |
3398 | rip_if_rmap_update(ctx, if_rmap); | |
3399 | } | |
3400 | ||
3401 | static void rip_routemap_update_redistribute(struct rip *rip) | |
3402 | { | |
3403 | for (int i = 0; i < ZEBRA_ROUTE_MAX; i++) { | |
3404 | if (rip->redist[i].route_map.name) { | |
3405 | rip->redist[i].route_map.map = route_map_lookup_by_name( | |
3406 | rip->redist[i].route_map.name); | |
3407 | route_map_counter_increment( | |
3408 | rip->redist[i].route_map.map); | |
3409 | } | |
3410 | } | |
3411 | } | |
3412 | ||
3413 | /* ARGSUSED */ | |
3414 | static void rip_routemap_update(const char *notused) | |
3415 | { | |
3416 | struct vrf *vrf = vrf_lookup_by_id(VRF_DEFAULT); | |
3417 | struct rip *rip; | |
3418 | struct interface *ifp; | |
3419 | ||
3420 | FOR_ALL_INTERFACES (vrf, ifp) | |
3421 | rip_if_rmap_update_interface(ifp); | |
3422 | ||
3423 | rip = vrf->info; | |
3424 | if (rip) | |
3425 | rip_routemap_update_redistribute(rip); | |
3426 | } | |
3427 | ||
3428 | /* Link RIP instance to VRF. */ | |
3429 | static void rip_vrf_link(struct rip *rip, struct vrf *vrf) | |
3430 | { | |
3431 | struct interface *ifp; | |
3432 | ||
3433 | rip->vrf = vrf; | |
3434 | rip->distribute_ctx->vrf = vrf; | |
3435 | vrf->info = rip; | |
3436 | ||
3437 | FOR_ALL_INTERFACES (vrf, ifp) | |
3438 | rip_interface_sync(ifp); | |
3439 | } | |
3440 | ||
3441 | /* Unlink RIP instance from VRF. */ | |
3442 | static void rip_vrf_unlink(struct rip *rip, struct vrf *vrf) | |
3443 | { | |
3444 | struct interface *ifp; | |
3445 | ||
3446 | rip->vrf = NULL; | |
3447 | rip->distribute_ctx->vrf = NULL; | |
3448 | vrf->info = NULL; | |
3449 | ||
3450 | FOR_ALL_INTERFACES (vrf, ifp) | |
3451 | rip_interface_sync(ifp); | |
3452 | } | |
3453 | ||
3454 | static void rip_instance_enable(struct rip *rip, struct vrf *vrf, int sock) | |
3455 | { | |
3456 | rip->sock = sock; | |
3457 | ||
3458 | rip_vrf_link(rip, vrf); | |
3459 | rip->enabled = true; | |
3460 | ||
3461 | /* Resend all redistribute requests. */ | |
3462 | rip_redistribute_enable(rip); | |
3463 | ||
3464 | /* Create read and timer thread. */ | |
3465 | rip_event(rip, RIP_READ, rip->sock); | |
3466 | rip_event(rip, RIP_UPDATE_EVENT, 1); | |
3467 | ||
3468 | rip_zebra_vrf_register(vrf); | |
3469 | } | |
3470 | ||
3471 | static void rip_instance_disable(struct rip *rip) | |
3472 | { | |
3473 | struct vrf *vrf = rip->vrf; | |
3474 | struct route_node *rp; | |
3475 | ||
3476 | /* Clear RIP routes */ | |
3477 | for (rp = route_top(rip->table); rp; rp = route_next(rp)) { | |
3478 | struct rip_info *rinfo; | |
3479 | struct list *list; | |
3480 | struct listnode *listnode; | |
3481 | ||
3482 | if ((list = rp->info) == NULL) | |
3483 | continue; | |
3484 | ||
3485 | rinfo = listgetdata(listhead(list)); | |
3486 | if (rip_route_rte(rinfo)) | |
3487 | rip_zebra_ipv4_delete(rip, rp); | |
3488 | ||
3489 | for (ALL_LIST_ELEMENTS_RO(list, listnode, rinfo)) { | |
3490 | EVENT_OFF(rinfo->t_timeout); | |
3491 | EVENT_OFF(rinfo->t_garbage_collect); | |
3492 | rip_info_free(rinfo); | |
3493 | } | |
3494 | list_delete(&list); | |
3495 | rp->info = NULL; | |
3496 | route_unlock_node(rp); | |
3497 | } | |
3498 | ||
3499 | /* Flush all redistribute requests. */ | |
3500 | rip_redistribute_disable(rip); | |
3501 | ||
3502 | /* Cancel RIP related timers. */ | |
3503 | EVENT_OFF(rip->t_update); | |
3504 | EVENT_OFF(rip->t_triggered_update); | |
3505 | EVENT_OFF(rip->t_triggered_interval); | |
3506 | ||
3507 | /* Cancel read thread. */ | |
3508 | EVENT_OFF(rip->t_read); | |
3509 | ||
3510 | /* Close RIP socket. */ | |
3511 | close(rip->sock); | |
3512 | rip->sock = -1; | |
3513 | ||
3514 | /* Clear existing peers. */ | |
3515 | list_delete_all_node(rip->peer_list); | |
3516 | ||
3517 | rip_zebra_vrf_deregister(vrf); | |
3518 | ||
3519 | rip_vrf_unlink(rip, vrf); | |
3520 | rip->enabled = false; | |
3521 | } | |
3522 | ||
3523 | static int rip_vrf_new(struct vrf *vrf) | |
3524 | { | |
3525 | if (IS_RIP_DEBUG_EVENT) | |
3526 | zlog_debug("%s: VRF created: %s(%u)", __func__, vrf->name, | |
3527 | vrf->vrf_id); | |
3528 | ||
3529 | return 0; | |
3530 | } | |
3531 | ||
3532 | static int rip_vrf_delete(struct vrf *vrf) | |
3533 | { | |
3534 | struct rip *rip; | |
3535 | ||
3536 | if (IS_RIP_DEBUG_EVENT) | |
3537 | zlog_debug("%s: VRF deleted: %s(%u)", __func__, vrf->name, | |
3538 | vrf->vrf_id); | |
3539 | ||
3540 | rip = rip_lookup_by_vrf_name(vrf->name); | |
3541 | if (!rip) | |
3542 | return 0; | |
3543 | ||
3544 | rip_clean(rip); | |
3545 | ||
3546 | return 0; | |
3547 | } | |
3548 | ||
3549 | static int rip_vrf_enable(struct vrf *vrf) | |
3550 | { | |
3551 | struct rip *rip; | |
3552 | int socket; | |
3553 | ||
3554 | rip = rip_lookup_by_vrf_name(vrf->name); | |
3555 | if (!rip || rip->enabled) | |
3556 | return 0; | |
3557 | ||
3558 | if (IS_RIP_DEBUG_EVENT) | |
3559 | zlog_debug("%s: VRF %s(%u) enabled", __func__, vrf->name, | |
3560 | vrf->vrf_id); | |
3561 | ||
3562 | /* Activate the VRF RIP instance. */ | |
3563 | if (!rip->enabled) { | |
3564 | socket = rip_create_socket(vrf); | |
3565 | if (socket < 0) | |
3566 | return -1; | |
3567 | ||
3568 | rip_instance_enable(rip, vrf, socket); | |
3569 | } | |
3570 | ||
3571 | return 0; | |
3572 | } | |
3573 | ||
3574 | static int rip_vrf_disable(struct vrf *vrf) | |
3575 | { | |
3576 | struct rip *rip; | |
3577 | ||
3578 | rip = rip_lookup_by_vrf_name(vrf->name); | |
3579 | if (!rip || !rip->enabled) | |
3580 | return 0; | |
3581 | ||
3582 | if (IS_RIP_DEBUG_EVENT) | |
3583 | zlog_debug("%s: VRF %s(%u) disabled", __func__, vrf->name, | |
3584 | vrf->vrf_id); | |
3585 | ||
3586 | /* Deactivate the VRF RIP instance. */ | |
3587 | if (rip->enabled) | |
3588 | rip_instance_disable(rip); | |
3589 | ||
3590 | return 0; | |
3591 | } | |
3592 | ||
3593 | void rip_vrf_init(void) | |
3594 | { | |
3595 | vrf_init(rip_vrf_new, rip_vrf_enable, rip_vrf_disable, rip_vrf_delete); | |
3596 | ||
3597 | vrf_cmd_init(NULL); | |
3598 | } | |
3599 | ||
3600 | void rip_vrf_terminate(void) | |
3601 | { | |
3602 | vrf_terminate(); | |
3603 | } | |
3604 | ||
3605 | /* Allocate new rip structure and set default value. */ | |
3606 | void rip_init(void) | |
3607 | { | |
3608 | /* Install top nodes. */ | |
3609 | install_node(&rip_node); | |
3610 | ||
3611 | /* Install rip commands. */ | |
3612 | install_element(VIEW_NODE, &show_ip_rip_cmd); | |
3613 | install_element(VIEW_NODE, &show_ip_rip_status_cmd); | |
3614 | ||
3615 | install_default(RIP_NODE); | |
3616 | ||
3617 | /* Debug related init. */ | |
3618 | rip_debug_init(); | |
3619 | ||
3620 | /* Access list install. */ | |
3621 | access_list_init(); | |
3622 | access_list_add_hook(rip_distribute_update_all_wrapper); | |
3623 | access_list_delete_hook(rip_distribute_update_all_wrapper); | |
3624 | ||
3625 | /* Prefix list initialize.*/ | |
3626 | prefix_list_init(); | |
3627 | prefix_list_add_hook(rip_distribute_update_all); | |
3628 | prefix_list_delete_hook(rip_distribute_update_all); | |
3629 | ||
3630 | /* Route-map */ | |
3631 | rip_route_map_init(); | |
3632 | ||
3633 | route_map_add_hook(rip_routemap_update); | |
3634 | route_map_delete_hook(rip_routemap_update); | |
3635 | ||
3636 | if_rmap_init(RIP_NODE); | |
3637 | } |