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718e3744 | 1 | /* RIP version 1 and 2. |
fbf5d033 | 2 | * Copyright (C) 2005 6WIND <alain.ritoux@6wind.com> |
718e3744 | 3 | * Copyright (C) 1997, 98, 99 Kunihiro Ishiguro <kunihiro@zebra.org> |
4 | * | |
5 | * This file is part of GNU Zebra. | |
6 | * | |
7 | * GNU Zebra is free software; you can redistribute it and/or modify it | |
8 | * under the terms of the GNU General Public License as published by the | |
9 | * Free Software Foundation; either version 2, or (at your option) any | |
10 | * later version. | |
11 | * | |
12 | * GNU Zebra is distributed in the hope that it will be useful, but | |
13 | * WITHOUT ANY WARRANTY; without even the implied warranty of | |
14 | * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU | |
15 | * General Public License for more details. | |
16 | * | |
896014f4 DL |
17 | * You should have received a copy of the GNU General Public License along |
18 | * with this program; see the file COPYING; if not, write to the Free Software | |
19 | * Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA | |
718e3744 | 20 | */ |
21 | ||
22 | #include <zebra.h> | |
23 | ||
b2d7c082 | 24 | #include "vrf.h" |
718e3744 | 25 | #include "if.h" |
26 | #include "command.h" | |
27 | #include "prefix.h" | |
28 | #include "table.h" | |
29 | #include "thread.h" | |
30 | #include "memory.h" | |
31 | #include "log.h" | |
32 | #include "stream.h" | |
33 | #include "filter.h" | |
34 | #include "sockunion.h" | |
1af81933 | 35 | #include "sockopt.h" |
718e3744 | 36 | #include "routemap.h" |
16705130 | 37 | #include "if_rmap.h" |
718e3744 | 38 | #include "plist.h" |
39 | #include "distribute.h" | |
c1a03d47 | 40 | #include "md5.h" |
718e3744 | 41 | #include "keychain.h" |
edd7c245 | 42 | #include "privs.h" |
718e3744 | 43 | |
44 | #include "ripd/ripd.h" | |
45 | #include "ripd/rip_debug.h" | |
46 | ||
f6eacff4 DL |
47 | DEFINE_QOBJ_TYPE(rip) |
48 | ||
0b3acf4f | 49 | /* UDP receive buffer size */ |
50 | #define RIP_UDP_RCV_BUF 41600 | |
51 | ||
52 | /* privileges global */ | |
edd7c245 | 53 | extern struct zebra_privs_t ripd_privs; |
54 | ||
718e3744 | 55 | /* RIP Structure. */ |
56 | struct rip *rip = NULL; | |
57 | ||
58 | /* RIP neighbor address table. */ | |
59 | struct route_table *rip_neighbor_table; | |
60 | ||
61 | /* RIP route changes. */ | |
62 | long rip_global_route_changes = 0; | |
63 | ||
64 | /* RIP queries. */ | |
65 | long rip_global_queries = 0; | |
6b0655a2 | 66 | |
718e3744 | 67 | /* Prototypes. */ |
d62a17ae | 68 | static void rip_event(enum rip_event, int); |
69 | static void rip_output_process(struct connected *, struct sockaddr_in *, int, | |
70 | u_char); | |
71 | static int rip_triggered_update(struct thread *); | |
72 | static int rip_update_jitter(unsigned long); | |
6b0655a2 | 73 | |
718e3744 | 74 | /* RIP output routes type. */ |
d62a17ae | 75 | enum { rip_all_route, rip_changed_route }; |
6b0655a2 | 76 | |
718e3744 | 77 | /* RIP command strings. */ |
d62a17ae | 78 | static const struct message rip_msg[] = {{RIP_REQUEST, "REQUEST"}, |
79 | {RIP_RESPONSE, "RESPONSE"}, | |
80 | {RIP_TRACEON, "TRACEON"}, | |
81 | {RIP_TRACEOFF, "TRACEOFF"}, | |
82 | {RIP_POLL, "POLL"}, | |
83 | {RIP_POLL_ENTRY, "POLL ENTRY"}, | |
84 | {0}}; | |
6b0655a2 | 85 | |
718e3744 | 86 | /* Utility function to set boradcast option to the socket. */ |
d62a17ae | 87 | static int sockopt_broadcast(int sock) |
718e3744 | 88 | { |
d62a17ae | 89 | int ret; |
90 | int on = 1; | |
718e3744 | 91 | |
d62a17ae | 92 | ret = setsockopt(sock, SOL_SOCKET, SO_BROADCAST, (char *)&on, |
93 | sizeof on); | |
94 | if (ret < 0) { | |
95 | zlog_warn("can't set sockopt SO_BROADCAST to socket %d", sock); | |
96 | return -1; | |
97 | } | |
98 | return 0; | |
718e3744 | 99 | } |
100 | ||
d62a17ae | 101 | static int rip_route_rte(struct rip_info *rinfo) |
718e3744 | 102 | { |
d62a17ae | 103 | return (rinfo->type == ZEBRA_ROUTE_RIP |
104 | && rinfo->sub_type == RIP_ROUTE_RTE); | |
718e3744 | 105 | } |
106 | ||
d62a17ae | 107 | static struct rip_info *rip_info_new(void) |
718e3744 | 108 | { |
d62a17ae | 109 | return XCALLOC(MTYPE_RIP_INFO, sizeof(struct rip_info)); |
718e3744 | 110 | } |
111 | ||
d62a17ae | 112 | void rip_info_free(struct rip_info *rinfo) |
718e3744 | 113 | { |
d62a17ae | 114 | XFREE(MTYPE_RIP_INFO, rinfo); |
718e3744 | 115 | } |
116 | ||
117 | /* RIP route garbage collect timer. */ | |
d62a17ae | 118 | static int rip_garbage_collect(struct thread *t) |
718e3744 | 119 | { |
d62a17ae | 120 | struct rip_info *rinfo; |
121 | struct route_node *rp; | |
122 | ||
123 | rinfo = THREAD_ARG(t); | |
124 | rinfo->t_garbage_collect = NULL; | |
718e3744 | 125 | |
d62a17ae | 126 | /* Off timeout timer. */ |
127 | RIP_TIMER_OFF(rinfo->t_timeout); | |
718e3744 | 128 | |
d62a17ae | 129 | /* Get route_node pointer. */ |
130 | rp = rinfo->rp; | |
718e3744 | 131 | |
d62a17ae | 132 | /* Unlock route_node. */ |
133 | listnode_delete(rp->info, rinfo); | |
134 | if (list_isempty((struct list *)rp->info)) { | |
135 | list_free(rp->info); | |
136 | rp->info = NULL; | |
137 | route_unlock_node(rp); | |
138 | } | |
718e3744 | 139 | |
d62a17ae | 140 | /* Free RIP routing information. */ |
141 | rip_info_free(rinfo); | |
718e3744 | 142 | |
d62a17ae | 143 | return 0; |
718e3744 | 144 | } |
145 | ||
d62a17ae | 146 | static void rip_timeout_update(struct rip_info *rinfo); |
bce8e868 LF |
147 | |
148 | /* Add new route to the ECMP list. | |
8478ae7e LF |
149 | * RETURN: the new entry added in the list, or NULL if it is not the first |
150 | * entry and ECMP is not allowed. | |
bce8e868 | 151 | */ |
d62a17ae | 152 | struct rip_info *rip_ecmp_add(struct rip_info *rinfo_new) |
718e3744 | 153 | { |
d62a17ae | 154 | struct route_node *rp = rinfo_new->rp; |
155 | struct rip_info *rinfo = NULL; | |
156 | struct list *list = NULL; | |
718e3744 | 157 | |
d62a17ae | 158 | if (rp->info == NULL) |
159 | rp->info = list_new(); | |
160 | list = (struct list *)rp->info; | |
bce8e868 | 161 | |
d62a17ae | 162 | /* If ECMP is not allowed and some entry already exists in the list, |
163 | * do nothing. */ | |
164 | if (listcount(list) && !rip->ecmp) | |
165 | return NULL; | |
8478ae7e | 166 | |
d62a17ae | 167 | rinfo = rip_info_new(); |
168 | memcpy(rinfo, rinfo_new, sizeof(struct rip_info)); | |
169 | listnode_add(list, rinfo); | |
bce8e868 | 170 | |
d62a17ae | 171 | if (rip_route_rte(rinfo)) { |
172 | rip_timeout_update(rinfo); | |
173 | rip_zebra_ipv4_add(rp); | |
174 | } | |
bce8e868 | 175 | |
d62a17ae | 176 | /* Set the route change flag on the first entry. */ |
177 | rinfo = listgetdata(listhead(list)); | |
178 | SET_FLAG(rinfo->flags, RIP_RTF_CHANGED); | |
bce8e868 | 179 | |
d62a17ae | 180 | /* Signal the output process to trigger an update (see section 2.5). */ |
181 | rip_event(RIP_TRIGGERED_UPDATE, 0); | |
718e3744 | 182 | |
d62a17ae | 183 | return rinfo; |
bce8e868 LF |
184 | } |
185 | ||
186 | /* Replace the ECMP list with the new route. | |
187 | * RETURN: the new entry added in the list | |
188 | */ | |
d62a17ae | 189 | struct rip_info *rip_ecmp_replace(struct rip_info *rinfo_new) |
190 | { | |
191 | struct route_node *rp = rinfo_new->rp; | |
192 | struct list *list = (struct list *)rp->info; | |
193 | struct rip_info *rinfo = NULL, *tmp_rinfo = NULL; | |
194 | struct listnode *node = NULL, *nextnode = NULL; | |
195 | ||
196 | if (list == NULL || listcount(list) == 0) | |
197 | return rip_ecmp_add(rinfo_new); | |
198 | ||
199 | /* Get the first entry */ | |
200 | rinfo = listgetdata(listhead(list)); | |
201 | ||
202 | /* Learnt route replaced by a local one. Delete it from zebra. */ | |
203 | if (rip_route_rte(rinfo) && !rip_route_rte(rinfo_new)) | |
204 | if (CHECK_FLAG(rinfo->flags, RIP_RTF_FIB)) | |
205 | rip_zebra_ipv4_delete(rp); | |
206 | ||
207 | /* Re-use the first entry, and delete the others. */ | |
208 | for (ALL_LIST_ELEMENTS(list, node, nextnode, tmp_rinfo)) | |
209 | if (tmp_rinfo != rinfo) { | |
210 | RIP_TIMER_OFF(tmp_rinfo->t_timeout); | |
211 | RIP_TIMER_OFF(tmp_rinfo->t_garbage_collect); | |
212 | list_delete_node(list, node); | |
213 | rip_info_free(tmp_rinfo); | |
214 | } | |
718e3744 | 215 | |
d62a17ae | 216 | RIP_TIMER_OFF(rinfo->t_timeout); |
217 | RIP_TIMER_OFF(rinfo->t_garbage_collect); | |
218 | memcpy(rinfo, rinfo_new, sizeof(struct rip_info)); | |
718e3744 | 219 | |
d62a17ae | 220 | if (rip_route_rte(rinfo)) { |
221 | rip_timeout_update(rinfo); | |
222 | /* The ADD message implies an update. */ | |
223 | rip_zebra_ipv4_add(rp); | |
224 | } | |
718e3744 | 225 | |
d62a17ae | 226 | /* Set the route change flag. */ |
227 | SET_FLAG(rinfo->flags, RIP_RTF_CHANGED); | |
718e3744 | 228 | |
d62a17ae | 229 | /* Signal the output process to trigger an update (see section 2.5). */ |
230 | rip_event(RIP_TRIGGERED_UPDATE, 0); | |
718e3744 | 231 | |
d62a17ae | 232 | return rinfo; |
bce8e868 LF |
233 | } |
234 | ||
235 | /* Delete one route from the ECMP list. | |
236 | * RETURN: | |
237 | * null - the entry is freed, and other entries exist in the list | |
238 | * the entry - the entry is the last one in the list; its metric is set | |
239 | * to INFINITY, and the garbage collector is started for it | |
240 | */ | |
d62a17ae | 241 | struct rip_info *rip_ecmp_delete(struct rip_info *rinfo) |
242 | { | |
243 | struct route_node *rp = rinfo->rp; | |
244 | struct list *list = (struct list *)rp->info; | |
245 | ||
246 | RIP_TIMER_OFF(rinfo->t_timeout); | |
247 | ||
248 | if (listcount(list) > 1) { | |
249 | /* Some other ECMP entries still exist. Just delete this entry. | |
250 | */ | |
251 | RIP_TIMER_OFF(rinfo->t_garbage_collect); | |
252 | listnode_delete(list, rinfo); | |
253 | if (rip_route_rte(rinfo) | |
254 | && CHECK_FLAG(rinfo->flags, RIP_RTF_FIB)) | |
255 | /* The ADD message implies the update. */ | |
256 | rip_zebra_ipv4_add(rp); | |
257 | rip_info_free(rinfo); | |
258 | rinfo = NULL; | |
259 | } else { | |
260 | assert(rinfo == listgetdata(listhead(list))); | |
261 | ||
262 | /* This is the only entry left in the list. We must keep it in | |
263 | * the list for garbage collection time, with INFINITY metric. | |
264 | */ | |
265 | ||
266 | rinfo->metric = RIP_METRIC_INFINITY; | |
267 | RIP_TIMER_ON(rinfo->t_garbage_collect, rip_garbage_collect, | |
268 | rip->garbage_time); | |
269 | ||
270 | if (rip_route_rte(rinfo) | |
271 | && CHECK_FLAG(rinfo->flags, RIP_RTF_FIB)) | |
272 | rip_zebra_ipv4_delete(rp); | |
273 | } | |
bce8e868 | 274 | |
d62a17ae | 275 | /* Set the route change flag on the first entry. */ |
276 | rinfo = listgetdata(listhead(list)); | |
277 | SET_FLAG(rinfo->flags, RIP_RTF_CHANGED); | |
bce8e868 | 278 | |
d62a17ae | 279 | /* Signal the output process to trigger an update (see section 2.5). */ |
280 | rip_event(RIP_TRIGGERED_UPDATE, 0); | |
bce8e868 | 281 | |
d62a17ae | 282 | return rinfo; |
bce8e868 LF |
283 | } |
284 | ||
285 | /* Timeout RIP routes. */ | |
d62a17ae | 286 | static int rip_timeout(struct thread *t) |
bce8e868 | 287 | { |
d62a17ae | 288 | rip_ecmp_delete((struct rip_info *)THREAD_ARG(t)); |
289 | return 0; | |
718e3744 | 290 | } |
291 | ||
d62a17ae | 292 | static void rip_timeout_update(struct rip_info *rinfo) |
718e3744 | 293 | { |
d62a17ae | 294 | if (rinfo->metric != RIP_METRIC_INFINITY) { |
295 | RIP_TIMER_OFF(rinfo->t_timeout); | |
296 | RIP_TIMER_ON(rinfo->t_timeout, rip_timeout, rip->timeout_time); | |
297 | } | |
298 | } | |
299 | ||
300 | static int rip_filter(int rip_distribute, struct prefix_ipv4 *p, | |
301 | struct rip_interface *ri) | |
302 | { | |
303 | struct distribute *dist; | |
304 | struct access_list *alist; | |
305 | struct prefix_list *plist; | |
306 | int distribute = rip_distribute == RIP_FILTER_OUT ? DISTRIBUTE_V4_OUT | |
307 | : DISTRIBUTE_V4_IN; | |
308 | const char *inout = rip_distribute == RIP_FILTER_OUT ? "out" : "in"; | |
309 | ||
310 | /* Input distribute-list filtering. */ | |
311 | if (ri->list[rip_distribute]) { | |
312 | if (access_list_apply(ri->list[rip_distribute], | |
313 | (struct prefix *)p) | |
314 | == FILTER_DENY) { | |
315 | if (IS_RIP_DEBUG_PACKET) | |
316 | zlog_debug("%s/%d filtered by distribute %s", | |
317 | inet_ntoa(p->prefix), p->prefixlen, | |
318 | inout); | |
319 | return -1; | |
718e3744 | 320 | } |
718e3744 | 321 | } |
d62a17ae | 322 | if (ri->prefix[rip_distribute]) { |
323 | if (prefix_list_apply(ri->prefix[rip_distribute], | |
324 | (struct prefix *)p) | |
325 | == PREFIX_DENY) { | |
326 | if (IS_RIP_DEBUG_PACKET) | |
327 | zlog_debug("%s/%d filtered by prefix-list %s", | |
328 | inet_ntoa(p->prefix), p->prefixlen, | |
329 | inout); | |
330 | return -1; | |
718e3744 | 331 | } |
718e3744 | 332 | } |
d62a17ae | 333 | |
334 | /* All interface filter check. */ | |
335 | dist = distribute_lookup(NULL); | |
336 | if (dist) { | |
337 | if (dist->list[distribute]) { | |
338 | alist = access_list_lookup(AFI_IP, | |
339 | dist->list[distribute]); | |
340 | ||
341 | if (alist) { | |
342 | if (access_list_apply(alist, (struct prefix *)p) | |
343 | == FILTER_DENY) { | |
344 | if (IS_RIP_DEBUG_PACKET) | |
345 | zlog_debug( | |
346 | "%s/%d filtered by distribute %s", | |
347 | inet_ntoa(p->prefix), | |
348 | p->prefixlen, inout); | |
349 | return -1; | |
350 | } | |
351 | } | |
352 | } | |
353 | if (dist->prefix[distribute]) { | |
354 | plist = prefix_list_lookup(AFI_IP, | |
355 | dist->prefix[distribute]); | |
356 | ||
357 | if (plist) { | |
358 | if (prefix_list_apply(plist, (struct prefix *)p) | |
359 | == PREFIX_DENY) { | |
360 | if (IS_RIP_DEBUG_PACKET) | |
361 | zlog_debug( | |
362 | "%s/%d filtered by prefix-list %s", | |
363 | inet_ntoa(p->prefix), | |
364 | p->prefixlen, inout); | |
365 | return -1; | |
366 | } | |
367 | } | |
368 | } | |
369 | } | |
370 | return 0; | |
718e3744 | 371 | } |
372 | ||
373 | /* Check nexthop address validity. */ | |
d62a17ae | 374 | static int rip_nexthop_check(struct in_addr *addr) |
718e3744 | 375 | { |
d62a17ae | 376 | struct listnode *node; |
377 | struct listnode *cnode; | |
378 | struct interface *ifp; | |
379 | struct connected *ifc; | |
380 | struct prefix *p; | |
718e3744 | 381 | |
d62a17ae | 382 | /* If nexthop address matches local configured address then it is |
383 | invalid nexthop. */ | |
b2d7c082 | 384 | |
d62a17ae | 385 | for (ALL_LIST_ELEMENTS_RO(vrf_iflist(VRF_DEFAULT), node, ifp)) { |
386 | for (ALL_LIST_ELEMENTS_RO(ifp->connected, cnode, ifc)) { | |
387 | p = ifc->address; | |
718e3744 | 388 | |
d62a17ae | 389 | if (p->family == AF_INET |
390 | && IPV4_ADDR_SAME(&p->u.prefix4, addr)) | |
391 | return -1; | |
392 | } | |
718e3744 | 393 | } |
d62a17ae | 394 | return 0; |
718e3744 | 395 | } |
396 | ||
397 | /* RIP add route to routing table. */ | |
d62a17ae | 398 | static void rip_rte_process(struct rte *rte, struct sockaddr_in *from, |
399 | struct interface *ifp) | |
400 | { | |
401 | int ret; | |
402 | struct prefix_ipv4 p; | |
403 | struct route_node *rp; | |
404 | struct rip_info *rinfo = NULL, newinfo; | |
405 | struct rip_interface *ri; | |
406 | struct in_addr *nexthop; | |
407 | int same = 0; | |
408 | unsigned char old_dist, new_dist; | |
409 | struct list *list = NULL; | |
410 | struct listnode *node = NULL; | |
411 | ||
412 | /* Make prefix structure. */ | |
413 | memset(&p, 0, sizeof(struct prefix_ipv4)); | |
414 | p.family = AF_INET; | |
415 | p.prefix = rte->prefix; | |
416 | p.prefixlen = ip_masklen(rte->mask); | |
417 | ||
418 | /* Make sure mask is applied. */ | |
419 | apply_mask_ipv4(&p); | |
420 | ||
421 | /* Apply input filters. */ | |
422 | ri = ifp->info; | |
718e3744 | 423 | |
d62a17ae | 424 | ret = rip_filter(RIP_FILTER_IN, &p, ri); |
425 | if (ret < 0) | |
426 | return; | |
427 | ||
428 | memset(&newinfo, 0, sizeof(newinfo)); | |
429 | newinfo.type = ZEBRA_ROUTE_RIP; | |
430 | newinfo.sub_type = RIP_ROUTE_RTE; | |
431 | newinfo.nexthop = rte->nexthop; | |
432 | newinfo.from = from->sin_addr; | |
433 | newinfo.ifindex = ifp->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 | int ret; | |
441 | ||
442 | /* The object should be of the type of rip_info */ | |
443 | ret = route_map_apply(ri->routemap[RIP_FILTER_IN], | |
444 | (struct prefix *)&p, RMAP_RIP, &newinfo); | |
445 | ||
446 | if (ret == RMAP_DENYMATCH) { | |
447 | if (IS_RIP_DEBUG_PACKET) | |
448 | zlog_debug( | |
449 | "RIP %s/%d is filtered by route-map in", | |
450 | inet_ntoa(p.prefix), p.prefixlen); | |
451 | return; | |
452 | } | |
453 | ||
454 | /* Get back the object */ | |
455 | rte->nexthop = newinfo.nexthop_out; | |
456 | rte->tag = htons(newinfo.tag_out); /* XXX */ | |
457 | rte->metric = | |
458 | newinfo.metric_out; /* XXX: the routemap uses the | |
459 | metric_out field */ | |
460 | } | |
461 | ||
462 | /* Once the entry has been validated, update the metric by | |
463 | adding the cost of the network on wich the message | |
464 | arrived. If the result is greater than infinity, use infinity | |
465 | (RFC2453 Sec. 3.9.2) */ | |
466 | /* Zebra ripd can handle offset-list in. */ | |
467 | ret = rip_offset_list_apply_in(&p, ifp, &rte->metric); | |
718e3744 | 468 | |
d62a17ae | 469 | /* If offset-list does not modify the metric use interface's |
470 | metric. */ | |
471 | if (!ret) | |
472 | rte->metric += ifp->metric ? ifp->metric : 1; | |
718e3744 | 473 | |
d62a17ae | 474 | if (rte->metric > RIP_METRIC_INFINITY) |
475 | rte->metric = RIP_METRIC_INFINITY; | |
476 | ||
477 | /* Set nexthop pointer. */ | |
478 | if (rte->nexthop.s_addr == 0) | |
479 | nexthop = &from->sin_addr; | |
480 | else | |
481 | nexthop = &rte->nexthop; | |
482 | ||
483 | /* Check if nexthop address is myself, then do nothing. */ | |
484 | if (rip_nexthop_check(nexthop) < 0) { | |
485 | if (IS_RIP_DEBUG_PACKET) | |
486 | zlog_debug("Nexthop address %s is myself", | |
487 | inet_ntoa(*nexthop)); | |
488 | return; | |
489 | } | |
490 | ||
491 | /* Get index for the prefix. */ | |
492 | rp = route_node_get(rip->table, (struct prefix *)&p); | |
493 | ||
494 | newinfo.rp = rp; | |
495 | newinfo.nexthop = *nexthop; | |
496 | newinfo.metric = rte->metric; | |
497 | newinfo.tag = ntohs(rte->tag); | |
498 | newinfo.distance = rip_distance_apply(&newinfo); | |
499 | ||
500 | new_dist = newinfo.distance ? newinfo.distance | |
501 | : ZEBRA_RIP_DISTANCE_DEFAULT; | |
502 | ||
503 | /* Check to see whether there is already RIP route on the table. */ | |
504 | if ((list = rp->info) != NULL) | |
505 | for (ALL_LIST_ELEMENTS_RO(list, node, rinfo)) { | |
506 | /* Need to compare with redistributed entry or local | |
507 | * entry */ | |
508 | if (!rip_route_rte(rinfo)) | |
509 | break; | |
510 | ||
511 | if (IPV4_ADDR_SAME(&rinfo->from, &from->sin_addr) | |
512 | && IPV4_ADDR_SAME(&rinfo->nexthop, nexthop)) | |
513 | break; | |
514 | ||
515 | if (!listnextnode(node)) { | |
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 | |
534 | ? rinfo->distance | |
535 | : ZEBRA_RIP_DISTANCE_DEFAULT; | |
536 | ||
537 | if (new_dist > old_dist) { | |
538 | /* New route has a greater distance. | |
539 | * Discard it. */ | |
540 | route_unlock_node(rp); | |
541 | return; | |
542 | } | |
543 | ||
544 | if (new_dist < old_dist) | |
545 | /* New route has a smaller distance. | |
546 | * Replace the ECMP list | |
547 | * with the new one in below. */ | |
548 | break; | |
549 | ||
550 | /* Metrics and distances are both same. Keep | |
551 | * "rinfo" null and | |
552 | * the new route is added in the ECMP list in | |
553 | * below. */ | |
554 | } | |
718e3744 | 555 | } |
d62a17ae | 556 | |
557 | if (rinfo) { | |
558 | /* Local static route. */ | |
559 | if (rinfo->type == ZEBRA_ROUTE_RIP | |
560 | && ((rinfo->sub_type == RIP_ROUTE_STATIC) | |
561 | || (rinfo->sub_type == RIP_ROUTE_DEFAULT)) | |
562 | && rinfo->metric != RIP_METRIC_INFINITY) { | |
563 | route_unlock_node(rp); | |
564 | return; | |
718e3744 | 565 | } |
d62a17ae | 566 | |
567 | /* Redistributed route check. */ | |
568 | if (rinfo->type != ZEBRA_ROUTE_RIP | |
569 | && rinfo->metric != RIP_METRIC_INFINITY) { | |
570 | old_dist = rinfo->distance; | |
571 | /* Only routes directly connected to an interface | |
572 | * (nexthop == 0) | |
573 | * may have a valid NULL distance */ | |
574 | if (rinfo->nexthop.s_addr != 0) | |
575 | old_dist = old_dist | |
576 | ? old_dist | |
577 | : ZEBRA_RIP_DISTANCE_DEFAULT; | |
578 | /* If imported route does not have STRICT precedence, | |
579 | mark it as a ghost */ | |
580 | if (new_dist <= old_dist | |
581 | && rte->metric != RIP_METRIC_INFINITY) | |
582 | rip_ecmp_replace(&newinfo); | |
583 | ||
584 | route_unlock_node(rp); | |
585 | return; | |
718e3744 | 586 | } |
d62a17ae | 587 | } |
588 | ||
589 | if (!rinfo) { | |
590 | if (rp->info) | |
591 | route_unlock_node(rp); | |
592 | ||
593 | /* Now, check to see whether there is already an explicit route | |
594 | for the destination prefix. If there is no such route, add | |
595 | this route to the routing table, unless the metric is | |
596 | infinity (there is no point in adding a route which | |
597 | unusable). */ | |
598 | if (rte->metric != RIP_METRIC_INFINITY) | |
599 | rip_ecmp_add(&newinfo); | |
600 | } else { | |
601 | /* Route is there but we are not sure the route is RIP or not. | |
602 | */ | |
603 | ||
604 | /* If there is an existing route, compare the next hop address | |
605 | to the address of the router from which the datagram came. | |
606 | If this datagram is from the same router as the existing | |
607 | route, reinitialize the timeout. */ | |
608 | same = (IPV4_ADDR_SAME(&rinfo->from, &from->sin_addr) | |
609 | && (rinfo->ifindex == ifp->ifindex)); | |
610 | ||
611 | old_dist = rinfo->distance ? rinfo->distance | |
612 | : ZEBRA_RIP_DISTANCE_DEFAULT; | |
613 | ||
614 | /* Next, compare the metrics. If the datagram is from the same | |
615 | router as the existing route, and the new metric is different | |
616 | than the old one; or, if the new metric is lower than the old | |
617 | one, or if the tag has been changed; or if there is a route | |
618 | with a lower administrave distance; or an update of the | |
619 | distance on the actual route; do the following actions: */ | |
620 | if ((same && rinfo->metric != rte->metric) | |
621 | || (rte->metric < rinfo->metric) | |
622 | || ((same) && (rinfo->metric == rte->metric) | |
623 | && (newinfo.tag != rinfo->tag)) | |
624 | || (old_dist > new_dist) | |
625 | || ((old_dist != new_dist) && same)) { | |
626 | if (listcount(list) == 1) { | |
627 | if (newinfo.metric != RIP_METRIC_INFINITY) | |
628 | rip_ecmp_replace(&newinfo); | |
629 | else | |
630 | rip_ecmp_delete(rinfo); | |
631 | } else { | |
632 | if (newinfo.metric < rinfo->metric) | |
633 | rip_ecmp_replace(&newinfo); | |
634 | else if (newinfo.metric > rinfo->metric) | |
635 | rip_ecmp_delete(rinfo); | |
636 | else if (new_dist < old_dist) | |
637 | rip_ecmp_replace(&newinfo); | |
638 | else if (new_dist > old_dist) | |
639 | rip_ecmp_delete(rinfo); | |
640 | else { | |
641 | int update = CHECK_FLAG(rinfo->flags, | |
642 | RIP_RTF_FIB) | |
643 | ? 1 | |
644 | : 0; | |
645 | ||
646 | assert(newinfo.metric | |
647 | != RIP_METRIC_INFINITY); | |
648 | ||
649 | RIP_TIMER_OFF(rinfo->t_timeout); | |
650 | RIP_TIMER_OFF(rinfo->t_garbage_collect); | |
651 | memcpy(rinfo, &newinfo, | |
652 | sizeof(struct rip_info)); | |
653 | rip_timeout_update(rinfo); | |
654 | ||
655 | if (update) | |
656 | rip_zebra_ipv4_add(rp); | |
657 | ||
658 | /* - Set the route change flag on the | |
659 | * first entry. */ | |
660 | rinfo = listgetdata(listhead(list)); | |
661 | SET_FLAG(rinfo->flags, RIP_RTF_CHANGED); | |
662 | rip_event(RIP_TRIGGERED_UPDATE, 0); | |
663 | } | |
664 | } | |
665 | } else /* same & no change */ | |
666 | rip_timeout_update(rinfo); | |
667 | ||
668 | /* Unlock tempolary lock of the route. */ | |
669 | route_unlock_node(rp); | |
670 | } | |
671 | } | |
672 | ||
673 | /* Dump RIP packet */ | |
674 | static void rip_packet_dump(struct rip_packet *packet, int size, | |
675 | const char *sndrcv) | |
676 | { | |
677 | caddr_t lim; | |
678 | struct rte *rte; | |
679 | const char *command_str; | |
680 | char pbuf[BUFSIZ], nbuf[BUFSIZ]; | |
681 | u_char netmask = 0; | |
682 | u_char *p; | |
683 | ||
684 | /* Set command string. */ | |
685 | if (packet->command > 0 && packet->command < RIP_COMMAND_MAX) | |
686 | command_str = lookup_msg(rip_msg, packet->command, NULL); | |
687 | else | |
688 | command_str = "unknown"; | |
689 | ||
690 | /* Dump packet header. */ | |
691 | zlog_debug("%s %s version %d packet size %d", sndrcv, command_str, | |
692 | packet->version, size); | |
693 | ||
694 | /* Dump each routing table entry. */ | |
695 | rte = packet->rte; | |
696 | ||
697 | for (lim = (caddr_t)packet + size; (caddr_t)rte < lim; rte++) { | |
698 | if (packet->version == RIPv2) { | |
699 | netmask = ip_masklen(rte->mask); | |
700 | ||
701 | if (rte->family == htons(RIP_FAMILY_AUTH)) { | |
702 | if (rte->tag | |
703 | == htons(RIP_AUTH_SIMPLE_PASSWORD)) { | |
704 | p = (u_char *)&rte->prefix; | |
705 | ||
706 | zlog_debug( | |
707 | " family 0x%X type %d auth string: %s", | |
708 | ntohs(rte->family), | |
709 | ntohs(rte->tag), p); | |
710 | } else if (rte->tag == htons(RIP_AUTH_MD5)) { | |
711 | struct rip_md5_info *md5; | |
712 | ||
713 | md5 = (struct rip_md5_info *)&packet | |
714 | ->rte; | |
715 | ||
716 | zlog_debug( | |
717 | " family 0x%X type %d (MD5 authentication)", | |
718 | ntohs(md5->family), | |
719 | ntohs(md5->type)); | |
720 | zlog_debug( | |
721 | " RIP-2 packet len %d Key ID %d" | |
722 | " Auth Data len %d", | |
723 | ntohs(md5->packet_len), | |
724 | md5->keyid, md5->auth_len); | |
725 | zlog_debug( | |
726 | " Sequence Number %ld", | |
727 | (u_long)ntohl(md5->sequence)); | |
728 | } else if (rte->tag == htons(RIP_AUTH_DATA)) { | |
729 | p = (u_char *)&rte->prefix; | |
730 | ||
731 | zlog_debug( | |
732 | " family 0x%X type %d (MD5 data)", | |
733 | ntohs(rte->family), | |
734 | ntohs(rte->tag)); | |
735 | zlog_debug( | |
736 | " MD5: %02X%02X%02X%02X%02X%02X%02X%02X" | |
737 | "%02X%02X%02X%02X%02X%02X%02X%02X", | |
738 | p[0], p[1], p[2], p[3], p[4], | |
739 | p[5], p[6], p[7], p[8], p[9], | |
740 | p[10], p[11], p[12], p[13], | |
741 | p[14], p[15]); | |
742 | } else { | |
743 | zlog_debug( | |
744 | " family 0x%X type %d (Unknown auth type)", | |
745 | ntohs(rte->family), | |
746 | ntohs(rte->tag)); | |
747 | } | |
748 | } else | |
749 | zlog_debug( | |
750 | " %s/%d -> %s family %d tag %" ROUTE_TAG_PRI | |
751 | " metric %ld", | |
752 | inet_ntop(AF_INET, &rte->prefix, pbuf, | |
753 | BUFSIZ), | |
754 | netmask, | |
755 | inet_ntop(AF_INET, &rte->nexthop, nbuf, | |
756 | BUFSIZ), | |
757 | ntohs(rte->family), | |
758 | (route_tag_t)ntohs(rte->tag), | |
759 | (u_long)ntohl(rte->metric)); | |
760 | } else { | |
761 | zlog_debug( | |
762 | " %s family %d tag %" ROUTE_TAG_PRI | |
763 | " metric %ld", | |
764 | inet_ntop(AF_INET, &rte->prefix, pbuf, BUFSIZ), | |
765 | ntohs(rte->family), | |
766 | (route_tag_t)ntohs(rte->tag), | |
767 | (u_long)ntohl(rte->metric)); | |
718e3744 | 768 | } |
718e3744 | 769 | } |
718e3744 | 770 | } |
771 | ||
772 | /* Check if the destination address is valid (unicast; not net 0 | |
773 | or 127) (RFC2453 Section 3.9.2 - Page 26). But we don't | |
774 | check net 0 because we accept default route. */ | |
d62a17ae | 775 | static int rip_destination_check(struct in_addr addr) |
718e3744 | 776 | { |
d62a17ae | 777 | u_int32_t destination; |
718e3744 | 778 | |
d62a17ae | 779 | /* Convert to host byte order. */ |
780 | destination = ntohl(addr.s_addr); | |
718e3744 | 781 | |
d62a17ae | 782 | if (IPV4_NET127(destination)) |
783 | return 0; | |
718e3744 | 784 | |
d62a17ae | 785 | /* Net 0 may match to the default route. */ |
786 | if (IPV4_NET0(destination) && destination != 0) | |
787 | return 0; | |
718e3744 | 788 | |
d62a17ae | 789 | /* Unicast address must belong to class A, B, C. */ |
790 | if (IN_CLASSA(destination)) | |
791 | return 1; | |
792 | if (IN_CLASSB(destination)) | |
793 | return 1; | |
794 | if (IN_CLASSC(destination)) | |
795 | return 1; | |
718e3744 | 796 | |
d62a17ae | 797 | return 0; |
718e3744 | 798 | } |
799 | ||
800 | /* RIP version 2 authentication. */ | |
d62a17ae | 801 | static int rip_auth_simple_password(struct rte *rte, struct sockaddr_in *from, |
802 | struct interface *ifp) | |
803 | { | |
804 | struct rip_interface *ri; | |
805 | char *auth_str = (char *)&rte->prefix; | |
806 | int i; | |
807 | ||
808 | /* reject passwords with zeros in the middle of the string */ | |
809 | for (i = strlen(auth_str); i < 16; i++) { | |
810 | if (auth_str[i] != '\0') | |
811 | return 0; | |
812 | } | |
813 | ||
814 | if (IS_RIP_DEBUG_EVENT) | |
815 | zlog_debug("RIPv2 simple password authentication from %s", | |
816 | inet_ntoa(from->sin_addr)); | |
817 | ||
818 | ri = ifp->info; | |
819 | ||
820 | if (ri->auth_type != RIP_AUTH_SIMPLE_PASSWORD | |
821 | || rte->tag != htons(RIP_AUTH_SIMPLE_PASSWORD)) | |
822 | return 0; | |
718e3744 | 823 | |
d62a17ae | 824 | /* Simple password authentication. */ |
825 | if (ri->auth_str) { | |
826 | if (strncmp(auth_str, ri->auth_str, 16) == 0) | |
827 | return 1; | |
828 | } | |
829 | if (ri->key_chain) { | |
830 | struct keychain *keychain; | |
831 | struct key *key; | |
832 | ||
833 | keychain = keychain_lookup(ri->key_chain); | |
834 | if (keychain == NULL) | |
835 | return 0; | |
836 | ||
837 | key = key_match_for_accept(keychain, auth_str); | |
838 | if (key) | |
839 | return 1; | |
840 | } | |
841 | return 0; | |
718e3744 | 842 | } |
843 | ||
844 | /* RIP version 2 authentication with MD5. */ | |
d62a17ae | 845 | static int rip_auth_md5(struct rip_packet *packet, struct sockaddr_in *from, |
846 | int length, struct interface *ifp) | |
847 | { | |
848 | struct rip_interface *ri; | |
849 | struct rip_md5_info *md5; | |
850 | struct rip_md5_data *md5data; | |
851 | struct keychain *keychain; | |
852 | struct key *key; | |
853 | MD5_CTX ctx; | |
854 | u_char digest[RIP_AUTH_MD5_SIZE]; | |
855 | u_int16_t packet_len; | |
856 | char auth_str[RIP_AUTH_MD5_SIZE]; | |
857 | ||
858 | if (IS_RIP_DEBUG_EVENT) | |
859 | zlog_debug("RIPv2 MD5 authentication from %s", | |
860 | inet_ntoa(from->sin_addr)); | |
718e3744 | 861 | |
d62a17ae | 862 | ri = ifp->info; |
863 | md5 = (struct rip_md5_info *)&packet->rte; | |
864 | ||
865 | /* Check auth type. */ | |
866 | if (ri->auth_type != RIP_AUTH_MD5 || md5->type != htons(RIP_AUTH_MD5)) | |
867 | return 0; | |
868 | ||
869 | /* If the authentication length is less than 16, then it must be wrong | |
870 | * for | |
871 | * any interpretation of rfc2082. Some implementations also interpret | |
872 | * this as RIP_HEADER_SIZE+ RIP_AUTH_MD5_SIZE, aka | |
873 | * RIP_AUTH_MD5_COMPAT_SIZE. | |
874 | */ | |
875 | if (!((md5->auth_len == RIP_AUTH_MD5_SIZE) | |
876 | || (md5->auth_len == RIP_AUTH_MD5_COMPAT_SIZE))) { | |
877 | if (IS_RIP_DEBUG_EVENT) | |
878 | zlog_debug( | |
879 | "RIPv2 MD5 authentication, strange authentication " | |
880 | "length field %d", | |
881 | md5->auth_len); | |
882 | return 0; | |
883 | } | |
884 | ||
885 | /* grab and verify check packet length */ | |
886 | packet_len = ntohs(md5->packet_len); | |
718e3744 | 887 | |
d62a17ae | 888 | if (packet_len > (length - RIP_HEADER_SIZE - RIP_AUTH_MD5_SIZE)) { |
889 | if (IS_RIP_DEBUG_EVENT) | |
890 | zlog_debug( | |
891 | "RIPv2 MD5 authentication, packet length field %d " | |
892 | "greater than received length %d!", | |
893 | md5->packet_len, length); | |
894 | return 0; | |
895 | } | |
896 | ||
897 | /* retrieve authentication data */ | |
898 | md5data = (struct rip_md5_data *)(((u_char *)packet) + packet_len); | |
899 | ||
900 | memset(auth_str, 0, RIP_AUTH_MD5_SIZE); | |
901 | ||
902 | if (ri->key_chain) { | |
903 | keychain = keychain_lookup(ri->key_chain); | |
904 | if (keychain == NULL) | |
905 | return 0; | |
906 | ||
907 | key = key_lookup_for_accept(keychain, md5->keyid); | |
908 | if (key == NULL) | |
909 | return 0; | |
910 | ||
911 | strncpy(auth_str, key->string, RIP_AUTH_MD5_SIZE); | |
912 | } else if (ri->auth_str) | |
913 | strncpy(auth_str, ri->auth_str, RIP_AUTH_MD5_SIZE); | |
914 | ||
915 | if (auth_str[0] == 0) | |
916 | return 0; | |
917 | ||
918 | /* MD5 digest authentication. */ | |
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 | ||
925 | if (memcmp(md5data->digest, digest, RIP_AUTH_MD5_SIZE) == 0) | |
926 | return packet_len; | |
927 | else | |
928 | return 0; | |
718e3744 | 929 | } |
930 | ||
b14ee00b | 931 | /* Pick correct auth string for sends, prepare auth_str buffer for use. |
932 | * (left justified and padded). | |
933 | * | |
934 | * presumes one of ri or key is valid, and that the auth strings they point | |
935 | * to are nul terminated. If neither are present, auth_str will be fully | |
936 | * zero padded. | |
937 | * | |
938 | */ | |
d62a17ae | 939 | static void rip_auth_prepare_str_send(struct rip_interface *ri, struct key *key, |
940 | char *auth_str, int len) | |
718e3744 | 941 | { |
d62a17ae | 942 | assert(ri || key); |
718e3744 | 943 | |
d62a17ae | 944 | memset(auth_str, 0, len); |
945 | if (key && key->string) | |
946 | strncpy(auth_str, key->string, len); | |
947 | else if (ri->auth_str) | |
948 | strncpy(auth_str, ri->auth_str, len); | |
718e3744 | 949 | |
d62a17ae | 950 | return; |
b14ee00b | 951 | } |
718e3744 | 952 | |
b14ee00b | 953 | /* Write RIPv2 simple password authentication information |
954 | * | |
d62a17ae | 955 | * auth_str is presumed to be 2 bytes and correctly prepared |
b14ee00b | 956 | * (left justified and zero padded). |
957 | */ | |
d62a17ae | 958 | static void rip_auth_simple_write(struct stream *s, char *auth_str, int len) |
b14ee00b | 959 | { |
d62a17ae | 960 | assert(s && len == RIP_AUTH_SIMPLE_SIZE); |
961 | ||
962 | stream_putw(s, RIP_FAMILY_AUTH); | |
963 | stream_putw(s, RIP_AUTH_SIMPLE_PASSWORD); | |
964 | stream_put(s, auth_str, RIP_AUTH_SIMPLE_SIZE); | |
965 | ||
966 | return; | |
b14ee00b | 967 | } |
718e3744 | 968 | |
d62a17ae | 969 | /* write RIPv2 MD5 "authentication header" |
b14ee00b | 970 | * (uses the auth key data field) |
971 | * | |
972 | * Digest offset field is set to 0. | |
973 | * | |
974 | * returns: offset of the digest offset field, which must be set when | |
975 | * length to the auth-data MD5 digest is known. | |
976 | */ | |
d62a17ae | 977 | static size_t rip_auth_md5_ah_write(struct stream *s, struct rip_interface *ri, |
978 | struct key *key) | |
979 | { | |
980 | size_t doff = 0; | |
981 | ||
982 | assert(s && ri && ri->auth_type == RIP_AUTH_MD5); | |
983 | ||
984 | /* MD5 authentication. */ | |
985 | stream_putw(s, RIP_FAMILY_AUTH); | |
986 | stream_putw(s, RIP_AUTH_MD5); | |
987 | ||
988 | /* MD5 AH digest offset field. | |
989 | * | |
990 | * Set to placeholder value here, to true value when RIP-2 Packet length | |
991 | * is known. Actual value is set in .....(). | |
992 | */ | |
993 | doff = stream_get_endp(s); | |
994 | stream_putw(s, 0); | |
995 | ||
996 | /* Key ID. */ | |
997 | if (key) | |
998 | stream_putc(s, key->index % 256); | |
999 | else | |
1000 | stream_putc(s, 1); | |
1001 | ||
1002 | /* Auth Data Len. Set 16 for MD5 authentication data. Older ripds | |
1003 | * however expect RIP_HEADER_SIZE + RIP_AUTH_MD5_SIZE so we allow for | |
1004 | * this | |
1005 | * to be configurable. | |
1006 | */ | |
1007 | stream_putc(s, ri->md5_auth_len); | |
1008 | ||
1009 | /* Sequence Number (non-decreasing). */ | |
1010 | /* RFC2080: The value used in the sequence number is | |
1011 | arbitrary, but two suggestions are the time of the | |
1012 | message's creation or a simple message counter. */ | |
1013 | stream_putl(s, time(NULL)); | |
1014 | ||
1015 | /* Reserved field must be zero. */ | |
1016 | stream_putl(s, 0); | |
1017 | stream_putl(s, 0); | |
1018 | ||
1019 | return doff; | |
b14ee00b | 1020 | } |
1021 | ||
1022 | /* If authentication is in used, write the appropriate header | |
1023 | * returns stream offset to which length must later be written | |
1024 | * or 0 if this is not required | |
1025 | */ | |
d62a17ae | 1026 | static size_t rip_auth_header_write(struct stream *s, struct rip_interface *ri, |
1027 | struct key *key, char *auth_str, int len) | |
1028 | { | |
1029 | assert(ri->auth_type != RIP_NO_AUTH); | |
1030 | ||
1031 | switch (ri->auth_type) { | |
1032 | case RIP_AUTH_SIMPLE_PASSWORD: | |
1033 | rip_auth_prepare_str_send(ri, key, auth_str, len); | |
1034 | rip_auth_simple_write(s, auth_str, len); | |
1035 | return 0; | |
1036 | case RIP_AUTH_MD5: | |
1037 | return rip_auth_md5_ah_write(s, ri, key); | |
1038 | } | |
1039 | assert(1); | |
1040 | return 0; | |
b14ee00b | 1041 | } |
1042 | ||
1043 | /* Write RIPv2 MD5 authentication data trailer */ | |
d62a17ae | 1044 | static void rip_auth_md5_set(struct stream *s, struct rip_interface *ri, |
1045 | size_t doff, char *auth_str, int authlen) | |
1046 | { | |
1047 | unsigned long len; | |
1048 | MD5_CTX ctx; | |
1049 | unsigned char digest[RIP_AUTH_MD5_SIZE]; | |
1050 | ||
1051 | /* Make it sure this interface is configured as MD5 | |
1052 | authentication. */ | |
1053 | assert((ri->auth_type == RIP_AUTH_MD5) | |
1054 | && (authlen == RIP_AUTH_MD5_SIZE)); | |
1055 | assert(doff > 0); | |
1056 | ||
1057 | /* Get packet length. */ | |
1058 | len = stream_get_endp(s); | |
1059 | ||
1060 | /* Check packet length. */ | |
1061 | if (len < (RIP_HEADER_SIZE + RIP_RTE_SIZE)) { | |
1062 | zlog_err( | |
1063 | "rip_auth_md5_set(): packet length %ld is less than minimum length.", | |
1064 | len); | |
1065 | return; | |
1066 | } | |
1067 | ||
1068 | /* Set the digest offset length in the header */ | |
1069 | stream_putw_at(s, doff, len); | |
1070 | ||
1071 | /* Set authentication data. */ | |
1072 | stream_putw(s, RIP_FAMILY_AUTH); | |
1073 | stream_putw(s, RIP_AUTH_DATA); | |
1074 | ||
1075 | /* Generate a digest for the RIP packet. */ | |
1076 | memset(&ctx, 0, sizeof(ctx)); | |
1077 | MD5Init(&ctx); | |
1078 | MD5Update(&ctx, STREAM_DATA(s), stream_get_endp(s)); | |
1079 | MD5Update(&ctx, auth_str, RIP_AUTH_MD5_SIZE); | |
1080 | MD5Final(digest, &ctx); | |
1081 | ||
1082 | /* Copy the digest to the packet. */ | |
1083 | stream_write(s, digest, RIP_AUTH_MD5_SIZE); | |
718e3744 | 1084 | } |
1085 | ||
1086 | /* RIP routing information. */ | |
d62a17ae | 1087 | static void rip_response_process(struct rip_packet *packet, int size, |
1088 | struct sockaddr_in *from, | |
1089 | struct connected *ifc) | |
1090 | { | |
1091 | caddr_t lim; | |
1092 | struct rte *rte; | |
1093 | struct prefix_ipv4 ifaddr; | |
1094 | struct prefix_ipv4 ifaddrclass; | |
1095 | int subnetted; | |
1096 | ||
1097 | memset(&ifaddr, 0, sizeof(ifaddr)); | |
1098 | /* We don't know yet. */ | |
1099 | subnetted = -1; | |
1100 | ||
1101 | /* The Response must be ignored if it is not from the RIP | |
1102 | port. (RFC2453 - Sec. 3.9.2)*/ | |
1103 | if (from->sin_port != htons(RIP_PORT_DEFAULT)) { | |
1104 | zlog_info("response doesn't come from RIP port: %d", | |
1105 | from->sin_port); | |
1106 | rip_peer_bad_packet(from); | |
1107 | return; | |
718e3744 | 1108 | } |
1109 | ||
d62a17ae | 1110 | /* The datagram's IPv4 source address should be checked to see |
1111 | whether the datagram is from a valid neighbor; the source of the | |
1112 | datagram must be on a directly connected network (RFC2453 - Sec. | |
1113 | 3.9.2) */ | |
1114 | if (if_lookup_address((void *)&from->sin_addr, AF_INET, VRF_DEFAULT) | |
1115 | == NULL) { | |
1116 | zlog_info( | |
1117 | "This datagram doesn't came from a valid neighbor: %s", | |
1118 | inet_ntoa(from->sin_addr)); | |
1119 | rip_peer_bad_packet(from); | |
1120 | return; | |
718e3744 | 1121 | } |
1122 | ||
d62a17ae | 1123 | /* It is also worth checking to see whether the response is from one |
1124 | of the router's own addresses. */ | |
1125 | ||
1126 | ; /* Alredy done in rip_read () */ | |
1127 | ||
1128 | /* Update RIP peer. */ | |
1129 | rip_peer_update(from, packet->version); | |
1130 | ||
1131 | /* Set RTE pointer. */ | |
1132 | rte = packet->rte; | |
1133 | ||
1134 | for (lim = (caddr_t)packet + size; (caddr_t)rte < lim; rte++) { | |
1135 | /* RIPv2 authentication check. */ | |
1136 | /* If the Address Family Identifier of the first (and only the | |
1137 | first) entry in the message is 0xFFFF, then the remainder of | |
1138 | the entry contains the authentication. */ | |
1139 | /* If the packet gets here it means authentication enabled */ | |
1140 | /* Check is done in rip_read(). So, just skipping it */ | |
1141 | if (packet->version == RIPv2 && rte == packet->rte | |
1142 | && rte->family == htons(RIP_FAMILY_AUTH)) | |
1143 | continue; | |
1144 | ||
1145 | if (rte->family != htons(AF_INET)) { | |
1146 | /* Address family check. RIP only supports AF_INET. */ | |
1147 | zlog_info("Unsupported family %d from %s.", | |
1148 | ntohs(rte->family), | |
1149 | inet_ntoa(from->sin_addr)); | |
1150 | continue; | |
718e3744 | 1151 | } |
d62a17ae | 1152 | |
1153 | /* - is the destination address valid (e.g., unicast; not net 0 | |
1154 | or 127) */ | |
1155 | if (!rip_destination_check(rte->prefix)) { | |
1156 | zlog_info( | |
1157 | "Network is net 0 or net 127 or it is not unicast network"); | |
1158 | rip_peer_bad_route(from); | |
1159 | continue; | |
718e3744 | 1160 | } |
1161 | ||
d62a17ae | 1162 | /* Convert metric value to host byte order. */ |
1163 | rte->metric = ntohl(rte->metric); | |
718e3744 | 1164 | |
d62a17ae | 1165 | /* - is the metric valid (i.e., between 1 and 16, inclusive) */ |
1166 | if (!(rte->metric >= 1 && rte->metric <= 16)) { | |
1167 | zlog_info("Route's metric is not in the 1-16 range."); | |
1168 | rip_peer_bad_route(from); | |
1169 | continue; | |
1170 | } | |
718e3744 | 1171 | |
d62a17ae | 1172 | /* RIPv1 does not have nexthop value. */ |
1173 | if (packet->version == RIPv1 && rte->nexthop.s_addr != 0) { | |
1174 | zlog_info("RIPv1 packet with nexthop value %s", | |
1175 | inet_ntoa(rte->nexthop)); | |
1176 | rip_peer_bad_route(from); | |
1177 | continue; | |
1178 | } | |
718e3744 | 1179 | |
d62a17ae | 1180 | /* That is, if the provided information is ignored, a possibly |
1181 | sub-optimal, but absolutely valid, route may be taken. If | |
1182 | the received Next Hop is not directly reachable, it should be | |
1183 | treated as 0.0.0.0. */ | |
1184 | if (packet->version == RIPv2 && rte->nexthop.s_addr != 0) { | |
1185 | u_int32_t addrval; | |
1186 | ||
1187 | /* Multicast address check. */ | |
1188 | addrval = ntohl(rte->nexthop.s_addr); | |
1189 | if (IN_CLASSD(addrval)) { | |
1190 | zlog_info( | |
1191 | "Nexthop %s is multicast address, skip this rte", | |
1192 | inet_ntoa(rte->nexthop)); | |
1193 | continue; | |
1194 | } | |
1195 | ||
1196 | if (!if_lookup_address((void *)&rte->nexthop, AF_INET, | |
1197 | VRF_DEFAULT)) { | |
1198 | struct route_node *rn; | |
1199 | struct rip_info *rinfo; | |
1200 | ||
1201 | rn = route_node_match_ipv4(rip->table, | |
1202 | &rte->nexthop); | |
1203 | ||
1204 | if (rn) { | |
1205 | rinfo = rn->info; | |
1206 | ||
1207 | if (rinfo->type == ZEBRA_ROUTE_RIP | |
1208 | && rinfo->sub_type | |
1209 | == RIP_ROUTE_RTE) { | |
1210 | if (IS_RIP_DEBUG_EVENT) | |
1211 | zlog_debug( | |
1212 | "Next hop %s is on RIP network. Set nexthop to the packet's originator", | |
1213 | inet_ntoa( | |
1214 | rte->nexthop)); | |
1215 | rte->nexthop = rinfo->from; | |
1216 | } else { | |
1217 | if (IS_RIP_DEBUG_EVENT) | |
1218 | zlog_debug( | |
1219 | "Next hop %s is not directly reachable. Treat it as 0.0.0.0", | |
1220 | inet_ntoa( | |
1221 | rte->nexthop)); | |
1222 | rte->nexthop.s_addr = 0; | |
1223 | } | |
1224 | ||
1225 | route_unlock_node(rn); | |
1226 | } else { | |
1227 | if (IS_RIP_DEBUG_EVENT) | |
1228 | zlog_debug( | |
1229 | "Next hop %s is not directly reachable. Treat it as 0.0.0.0", | |
1230 | inet_ntoa( | |
1231 | rte->nexthop)); | |
1232 | rte->nexthop.s_addr = 0; | |
1233 | } | |
1234 | } | |
1235 | } | |
718e3744 | 1236 | |
d62a17ae | 1237 | /* For RIPv1, there won't be a valid netmask. |
1238 | ||
1239 | This is a best guess at the masks. If everyone was using old | |
1240 | Ciscos before the 'ip subnet zero' option, it would be almost | |
1241 | right too :-) | |
1242 | ||
1243 | Cisco summarize ripv1 advertisments to the classful boundary | |
1244 | (/16 for class B's) except when the RIP packet does to inside | |
1245 | the classful network in question. */ | |
1246 | ||
1247 | if ((packet->version == RIPv1 && rte->prefix.s_addr != 0) | |
1248 | || (packet->version == RIPv2 | |
1249 | && (rte->prefix.s_addr != 0 | |
1250 | && rte->mask.s_addr == 0))) { | |
1251 | u_int32_t destination; | |
1252 | ||
1253 | if (subnetted == -1) { | |
1254 | memcpy(&ifaddr, ifc->address, | |
1255 | sizeof(struct prefix_ipv4)); | |
1256 | memcpy(&ifaddrclass, &ifaddr, | |
1257 | sizeof(struct prefix_ipv4)); | |
1258 | apply_classful_mask_ipv4(&ifaddrclass); | |
1259 | subnetted = 0; | |
1260 | if (ifaddr.prefixlen > ifaddrclass.prefixlen) | |
1261 | subnetted = 1; | |
1262 | } | |
1263 | ||
1264 | destination = ntohl(rte->prefix.s_addr); | |
1265 | ||
1266 | if (IN_CLASSA(destination)) | |
1267 | masklen2ip(8, &rte->mask); | |
1268 | else if (IN_CLASSB(destination)) | |
1269 | masklen2ip(16, &rte->mask); | |
1270 | else if (IN_CLASSC(destination)) | |
1271 | masklen2ip(24, &rte->mask); | |
1272 | ||
1273 | if (subnetted == 1) | |
1274 | masklen2ip(ifaddrclass.prefixlen, | |
1275 | (struct in_addr *)&destination); | |
1276 | if ((subnetted == 1) | |
1277 | && ((rte->prefix.s_addr & destination) | |
1278 | == ifaddrclass.prefix.s_addr)) { | |
1279 | masklen2ip(ifaddr.prefixlen, &rte->mask); | |
1280 | if ((rte->prefix.s_addr & rte->mask.s_addr) | |
1281 | != rte->prefix.s_addr) | |
1282 | masklen2ip(32, &rte->mask); | |
1283 | if (IS_RIP_DEBUG_EVENT) | |
1284 | zlog_debug("Subnetted route %s", | |
1285 | inet_ntoa(rte->prefix)); | |
1286 | } else { | |
1287 | if ((rte->prefix.s_addr & rte->mask.s_addr) | |
1288 | != rte->prefix.s_addr) | |
1289 | continue; | |
1290 | } | |
1291 | ||
1292 | if (IS_RIP_DEBUG_EVENT) { | |
1293 | zlog_debug("Resultant route %s", | |
1294 | inet_ntoa(rte->prefix)); | |
1295 | zlog_debug("Resultant mask %s", | |
1296 | inet_ntoa(rte->mask)); | |
1297 | } | |
1298 | } | |
1299 | ||
1300 | /* In case of RIPv2, if prefix in RTE is not netmask applied one | |
1301 | ignore the entry. */ | |
1302 | if ((packet->version == RIPv2) && (rte->mask.s_addr != 0) | |
1303 | && ((rte->prefix.s_addr & rte->mask.s_addr) | |
1304 | != rte->prefix.s_addr)) { | |
1305 | zlog_warn( | |
1306 | "RIPv2 address %s is not mask /%d applied one", | |
1307 | inet_ntoa(rte->prefix), ip_masklen(rte->mask)); | |
1308 | rip_peer_bad_route(from); | |
1309 | continue; | |
1310 | } | |
1311 | ||
1312 | /* Default route's netmask is ignored. */ | |
1313 | if (packet->version == RIPv2 && (rte->prefix.s_addr == 0) | |
1314 | && (rte->mask.s_addr != 0)) { | |
1315 | if (IS_RIP_DEBUG_EVENT) | |
1316 | zlog_debug( | |
1317 | "Default route with non-zero netmask. Set zero to netmask"); | |
1318 | rte->mask.s_addr = 0; | |
1319 | } | |
1320 | ||
1321 | /* Routing table updates. */ | |
1322 | rip_rte_process(rte, from, ifc->ifp); | |
718e3744 | 1323 | } |
718e3744 | 1324 | } |
1325 | ||
a4e987e0 | 1326 | /* Make socket for RIP protocol. */ |
d62a17ae | 1327 | static int rip_create_socket(void) |
1328 | { | |
1329 | int ret; | |
1330 | int sock; | |
1331 | struct sockaddr_in addr; | |
1332 | ||
1333 | memset(&addr, 0, sizeof(struct sockaddr_in)); | |
1334 | addr.sin_family = AF_INET; | |
1335 | addr.sin_addr.s_addr = INADDR_ANY; | |
6f0e3f6e | 1336 | #ifdef HAVE_STRUCT_SOCKADDR_IN_SIN_LEN |
d62a17ae | 1337 | addr.sin_len = sizeof(struct sockaddr_in); |
6f0e3f6e | 1338 | #endif /* HAVE_STRUCT_SOCKADDR_IN_SIN_LEN */ |
d62a17ae | 1339 | /* sending port must always be the RIP port */ |
1340 | addr.sin_port = htons(RIP_PORT_DEFAULT); | |
1341 | ||
1342 | /* Make datagram socket. */ | |
1343 | sock = socket(AF_INET, SOCK_DGRAM, IPPROTO_UDP); | |
1344 | if (sock < 0) { | |
1345 | zlog_err("Cannot create UDP socket: %s", safe_strerror(errno)); | |
1346 | exit(1); | |
1347 | } | |
1348 | ||
1349 | sockopt_broadcast(sock); | |
1350 | sockopt_reuseaddr(sock); | |
1351 | sockopt_reuseport(sock); | |
1352 | setsockopt_ipv4_multicast_loop(sock, 0); | |
a4e987e0 | 1353 | #ifdef RIP_RECVMSG |
d62a17ae | 1354 | setsockopt_pktinfo(sock); |
a4e987e0 | 1355 | #endif /* RIP_RECVMSG */ |
78b31d5c | 1356 | #ifdef IPTOS_PREC_INTERNETCONTROL |
d62a17ae | 1357 | setsockopt_ipv4_tos(sock, IPTOS_PREC_INTERNETCONTROL); |
78b31d5c | 1358 | #endif |
a4e987e0 | 1359 | |
d62a17ae | 1360 | if (ripd_privs.change(ZPRIVS_RAISE)) |
1361 | zlog_err("rip_create_socket: could not raise privs"); | |
1362 | setsockopt_so_recvbuf(sock, RIP_UDP_RCV_BUF); | |
1363 | if ((ret = bind(sock, (struct sockaddr *)&addr, sizeof(addr))) < 0) | |
1364 | ||
1365 | { | |
1366 | int save_errno = errno; | |
1367 | if (ripd_privs.change(ZPRIVS_LOWER)) | |
1368 | zlog_err("rip_create_socket: could not lower privs"); | |
1369 | ||
1370 | zlog_err("%s: Can't bind socket %d to %s port %d: %s", __func__, | |
1371 | sock, inet_ntoa(addr.sin_addr), | |
1372 | (int)ntohs(addr.sin_port), safe_strerror(save_errno)); | |
1373 | ||
1374 | close(sock); | |
1375 | return ret; | |
1376 | } | |
1377 | ||
1378 | if (ripd_privs.change(ZPRIVS_LOWER)) | |
1379 | zlog_err("rip_create_socket: could not lower privs"); | |
1380 | ||
1381 | return sock; | |
a4e987e0 | 1382 | } |
1383 | ||
c49ad8f1 | 1384 | /* RIP packet send to destination address, on interface denoted by |
1385 | * by connected argument. NULL to argument denotes destination should be | |
1386 | * should be RIP multicast group | |
1387 | */ | |
d62a17ae | 1388 | static int rip_send_packet(u_char *buf, int size, struct sockaddr_in *to, |
1389 | struct connected *ifc) | |
1390 | { | |
1391 | int ret; | |
1392 | struct sockaddr_in sin; | |
1393 | ||
1394 | assert(ifc != NULL); | |
1395 | ||
1396 | if (IS_RIP_DEBUG_PACKET) { | |
f69bd9da | 1397 | #define ADDRESS_SIZE 20 |
d62a17ae | 1398 | char dst[ADDRESS_SIZE]; |
1399 | dst[ADDRESS_SIZE - 1] = '\0'; | |
1400 | ||
1401 | if (to) { | |
1402 | strncpy(dst, inet_ntoa(to->sin_addr), ADDRESS_SIZE - 1); | |
1403 | } else { | |
1404 | sin.sin_addr.s_addr = htonl(INADDR_RIP_GROUP); | |
1405 | strncpy(dst, inet_ntoa(sin.sin_addr), ADDRESS_SIZE - 1); | |
1406 | } | |
f69bd9da | 1407 | #undef ADDRESS_SIZE |
d62a17ae | 1408 | zlog_debug("rip_send_packet %s > %s (%s)", |
1409 | inet_ntoa(ifc->address->u.prefix4), dst, | |
1410 | ifc->ifp->name); | |
1411 | } | |
1412 | ||
1413 | if (CHECK_FLAG(ifc->flags, ZEBRA_IFA_SECONDARY)) { | |
1414 | /* | |
1415 | * ZEBRA_IFA_SECONDARY is set on linux when an interface is | |
1416 | * configured | |
1417 | * with multiple addresses on the same subnet: the first address | |
1418 | * on the subnet is configured "primary", and all subsequent | |
1419 | * addresses | |
1420 | * on that subnet are treated as "secondary" addresses. | |
1421 | * In order to avoid routing-table bloat on other rip listeners, | |
1422 | * we do not send out RIP packets with ZEBRA_IFA_SECONDARY | |
1423 | * source addrs. | |
1424 | * XXX Since Linux is the only system for which the | |
1425 | * ZEBRA_IFA_SECONDARY | |
1426 | * flag is set, we would end up sending a packet for a | |
1427 | * "secondary" | |
1428 | * source address on non-linux systems. | |
1429 | */ | |
1430 | if (IS_RIP_DEBUG_PACKET) | |
1431 | zlog_debug("duplicate dropped"); | |
1432 | return 0; | |
1433 | } | |
1434 | ||
1435 | /* Make destination address. */ | |
1436 | memset(&sin, 0, sizeof(struct sockaddr_in)); | |
1437 | sin.sin_family = AF_INET; | |
6f0e3f6e | 1438 | #ifdef HAVE_STRUCT_SOCKADDR_IN_SIN_LEN |
d62a17ae | 1439 | sin.sin_len = sizeof(struct sockaddr_in); |
6f0e3f6e | 1440 | #endif /* HAVE_STRUCT_SOCKADDR_IN_SIN_LEN */ |
718e3744 | 1441 | |
d62a17ae | 1442 | /* When destination is specified, use it's port and address. */ |
1443 | if (to) { | |
1444 | sin.sin_port = to->sin_port; | |
1445 | sin.sin_addr = to->sin_addr; | |
1446 | } else { | |
1447 | sin.sin_port = htons(RIP_PORT_DEFAULT); | |
1448 | sin.sin_addr.s_addr = htonl(INADDR_RIP_GROUP); | |
ae735d2d | 1449 | |
d62a17ae | 1450 | rip_interface_multicast_set(rip->sock, ifc); |
1451 | } | |
718e3744 | 1452 | |
d62a17ae | 1453 | ret = sendto(rip->sock, buf, size, 0, (struct sockaddr *)&sin, |
1454 | sizeof(struct sockaddr_in)); | |
718e3744 | 1455 | |
d62a17ae | 1456 | if (IS_RIP_DEBUG_EVENT) |
1457 | zlog_debug("SEND to %s.%d", inet_ntoa(sin.sin_addr), | |
1458 | ntohs(sin.sin_port)); | |
718e3744 | 1459 | |
d62a17ae | 1460 | if (ret < 0) |
1461 | zlog_warn("can't send packet : %s", safe_strerror(errno)); | |
718e3744 | 1462 | |
d62a17ae | 1463 | return ret; |
718e3744 | 1464 | } |
1465 | ||
1466 | /* Add redistributed route to RIP table. */ | |
d62a17ae | 1467 | void rip_redistribute_add(int type, int sub_type, struct prefix_ipv4 *p, |
1468 | ifindex_t ifindex, struct in_addr *nexthop, | |
1469 | unsigned int metric, unsigned char distance, | |
1470 | route_tag_t tag) | |
1471 | { | |
1472 | int ret; | |
1473 | struct route_node *rp = NULL; | |
1474 | struct rip_info *rinfo = NULL, newinfo; | |
1475 | struct list *list = NULL; | |
1476 | ||
1477 | /* Redistribute route */ | |
1478 | ret = rip_destination_check(p->prefix); | |
1479 | if (!ret) | |
1480 | return; | |
1481 | ||
1482 | rp = route_node_get(rip->table, (struct prefix *)p); | |
1483 | ||
1484 | memset(&newinfo, 0, sizeof(struct rip_info)); | |
1485 | newinfo.type = type; | |
1486 | newinfo.sub_type = sub_type; | |
1487 | newinfo.ifindex = ifindex; | |
1488 | newinfo.metric = 1; | |
1489 | newinfo.external_metric = metric; | |
1490 | newinfo.distance = distance; | |
1491 | if (tag <= UINT16_MAX) /* RIP only supports 16 bit tags */ | |
1492 | newinfo.tag = tag; | |
1493 | newinfo.rp = rp; | |
1494 | if (nexthop) | |
1495 | newinfo.nexthop = *nexthop; | |
1496 | ||
1497 | if ((list = rp->info) != NULL && listcount(list) != 0) { | |
1498 | rinfo = listgetdata(listhead(list)); | |
1499 | ||
1500 | if (rinfo->type == ZEBRA_ROUTE_CONNECT | |
1501 | && rinfo->sub_type == RIP_ROUTE_INTERFACE | |
1502 | && rinfo->metric != RIP_METRIC_INFINITY) { | |
1503 | route_unlock_node(rp); | |
1504 | return; | |
1505 | } | |
718e3744 | 1506 | |
d62a17ae | 1507 | /* Manually configured RIP route check. */ |
1508 | if (rinfo->type == ZEBRA_ROUTE_RIP | |
1509 | && ((rinfo->sub_type == RIP_ROUTE_STATIC) | |
1510 | || (rinfo->sub_type == RIP_ROUTE_DEFAULT))) { | |
1511 | if (type != ZEBRA_ROUTE_RIP | |
1512 | || ((sub_type != RIP_ROUTE_STATIC) | |
1513 | && (sub_type != RIP_ROUTE_DEFAULT))) { | |
1514 | route_unlock_node(rp); | |
1515 | return; | |
1516 | } | |
1517 | } | |
1518 | ||
1519 | rinfo = rip_ecmp_replace(&newinfo); | |
1520 | route_unlock_node(rp); | |
1521 | } else | |
1522 | rinfo = rip_ecmp_add(&newinfo); | |
1523 | ||
1524 | if (IS_RIP_DEBUG_EVENT) { | |
1525 | if (!nexthop) | |
1526 | zlog_debug( | |
1527 | "Redistribute new prefix %s/%d on the interface %s", | |
1528 | inet_ntoa(p->prefix), p->prefixlen, | |
1529 | ifindex2ifname(ifindex, VRF_DEFAULT)); | |
1530 | else | |
1531 | zlog_debug( | |
1532 | "Redistribute new prefix %s/%d with nexthop %s on the interface %s", | |
1533 | inet_ntoa(p->prefix), p->prefixlen, | |
1534 | inet_ntoa(rinfo->nexthop), | |
1535 | ifindex2ifname(ifindex, VRF_DEFAULT)); | |
718e3744 | 1536 | } |
1537 | ||
d62a17ae | 1538 | rip_event(RIP_TRIGGERED_UPDATE, 0); |
718e3744 | 1539 | } |
1540 | ||
1541 | /* Delete redistributed route from RIP table. */ | |
d62a17ae | 1542 | void rip_redistribute_delete(int type, int sub_type, struct prefix_ipv4 *p, |
1543 | ifindex_t ifindex) | |
1544 | { | |
1545 | int ret; | |
1546 | struct route_node *rp; | |
1547 | struct rip_info *rinfo; | |
1548 | ||
1549 | ret = rip_destination_check(p->prefix); | |
1550 | if (!ret) | |
1551 | return; | |
1552 | ||
1553 | rp = route_node_lookup(rip->table, (struct prefix *)p); | |
1554 | if (rp) { | |
1555 | struct list *list = rp->info; | |
1556 | ||
1557 | if (list != NULL && listcount(list) != 0) { | |
1558 | rinfo = listgetdata(listhead(list)); | |
1559 | if (rinfo != NULL && rinfo->type == type | |
1560 | && rinfo->sub_type == sub_type | |
1561 | && rinfo->ifindex == ifindex) { | |
1562 | /* Perform poisoned reverse. */ | |
1563 | rinfo->metric = RIP_METRIC_INFINITY; | |
1564 | RIP_TIMER_ON(rinfo->t_garbage_collect, | |
1565 | rip_garbage_collect, | |
1566 | rip->garbage_time); | |
1567 | RIP_TIMER_OFF(rinfo->t_timeout); | |
1568 | rinfo->flags |= RIP_RTF_CHANGED; | |
1569 | ||
1570 | if (IS_RIP_DEBUG_EVENT) | |
1571 | zlog_debug( | |
1572 | "Poisone %s/%d on the interface %s with an " | |
1573 | "infinity metric [delete]", | |
1574 | inet_ntoa(p->prefix), | |
1575 | p->prefixlen, | |
1576 | ifindex2ifname(ifindex, | |
1577 | VRF_DEFAULT)); | |
1578 | ||
1579 | rip_event(RIP_TRIGGERED_UPDATE, 0); | |
1580 | } | |
1581 | } | |
1582 | route_unlock_node(rp); | |
1583 | } | |
718e3744 | 1584 | } |
1585 | ||
1586 | /* Response to request called from rip_read ().*/ | |
d62a17ae | 1587 | static void rip_request_process(struct rip_packet *packet, int size, |
1588 | struct sockaddr_in *from, struct connected *ifc) | |
1589 | { | |
1590 | caddr_t lim; | |
1591 | struct rte *rte; | |
1592 | struct prefix_ipv4 p; | |
1593 | struct route_node *rp; | |
1594 | struct rip_info *rinfo; | |
1595 | struct rip_interface *ri; | |
1596 | ||
1597 | /* Does not reponse to the requests on the loopback interfaces */ | |
1598 | if (if_is_loopback(ifc->ifp)) | |
1599 | return; | |
1600 | ||
1601 | /* Check RIP process is enabled on this interface. */ | |
1602 | ri = ifc->ifp->info; | |
1603 | if (!ri->running) | |
1604 | return; | |
1605 | ||
1606 | /* When passive interface is specified, suppress responses */ | |
1607 | if (ri->passive) | |
1608 | return; | |
1609 | ||
1610 | /* RIP peer update. */ | |
1611 | rip_peer_update(from, packet->version); | |
1612 | ||
1613 | lim = ((caddr_t)packet) + size; | |
1614 | rte = packet->rte; | |
1615 | ||
1616 | /* The Request is processed entry by entry. If there are no | |
1617 | entries, no response is given. */ | |
1618 | if (lim == (caddr_t)rte) | |
1619 | return; | |
1620 | ||
1621 | /* There is one special case. If there is exactly one entry in the | |
1622 | request, and it has an address family identifier of zero and a | |
1623 | metric of infinity (i.e., 16), then this is a request to send the | |
1624 | entire routing table. */ | |
1625 | if (lim == ((caddr_t)(rte + 1)) && ntohs(rte->family) == 0 | |
1626 | && ntohl(rte->metric) == RIP_METRIC_INFINITY) { | |
1627 | /* All route with split horizon */ | |
1628 | rip_output_process(ifc, from, rip_all_route, packet->version); | |
1629 | } else { | |
1630 | if (ntohs(rte->family) != AF_INET) | |
1631 | return; | |
1632 | ||
1633 | /* Examine the list of RTEs in the Request one by one. For each | |
1634 | entry, look up the destination in the router's routing | |
1635 | database and, if there is a route, put that route's metric in | |
1636 | the metric field of the RTE. If there is no explicit route | |
1637 | to the specified destination, put infinity in the metric | |
1638 | field. Once all the entries have been filled in, change the | |
1639 | command from Request to Response and send the datagram back | |
1640 | to the requestor. */ | |
1641 | p.family = AF_INET; | |
1642 | ||
1643 | for (; ((caddr_t)rte) < lim; rte++) { | |
1644 | p.prefix = rte->prefix; | |
1645 | p.prefixlen = ip_masklen(rte->mask); | |
1646 | apply_mask_ipv4(&p); | |
1647 | ||
1648 | rp = route_node_lookup(rip->table, (struct prefix *)&p); | |
1649 | if (rp) { | |
1650 | rinfo = listgetdata( | |
1651 | listhead((struct list *)rp->info)); | |
1652 | rte->metric = htonl(rinfo->metric); | |
1653 | route_unlock_node(rp); | |
1654 | } else | |
1655 | rte->metric = htonl(RIP_METRIC_INFINITY); | |
1656 | } | |
1657 | packet->command = RIP_RESPONSE; | |
4e054866 | 1658 | |
d62a17ae | 1659 | rip_send_packet((u_char *)packet, size, from, ifc); |
1660 | } | |
1661 | rip_global_queries++; | |
718e3744 | 1662 | } |
1663 | ||
1664 | #if RIP_RECVMSG | |
1665 | /* Set IPv6 packet info to the socket. */ | |
d62a17ae | 1666 | static int setsockopt_pktinfo(int sock) |
718e3744 | 1667 | { |
d62a17ae | 1668 | int ret; |
1669 | int val = 1; | |
1670 | ||
1671 | ret = setsockopt(sock, IPPROTO_IP, IP_PKTINFO, &val, sizeof(val)); | |
1672 | if (ret < 0) | |
1673 | zlog_warn("Can't setsockopt IP_PKTINFO : %s", | |
1674 | safe_strerror(errno)); | |
1675 | return ret; | |
718e3744 | 1676 | } |
1677 | ||
1678 | /* Read RIP packet by recvmsg function. */ | |
d62a17ae | 1679 | int rip_recvmsg(int sock, u_char *buf, int size, struct sockaddr_in *from, |
1680 | ifindex_t *ifindex) | |
1681 | { | |
1682 | int ret; | |
1683 | struct msghdr msg; | |
1684 | struct iovec iov; | |
1685 | struct cmsghdr *ptr; | |
1686 | char adata[1024]; | |
1687 | ||
1688 | msg.msg_name = (void *)from; | |
1689 | msg.msg_namelen = sizeof(struct sockaddr_in); | |
1690 | msg.msg_iov = &iov; | |
1691 | msg.msg_iovlen = 1; | |
1692 | msg.msg_control = (void *)adata; | |
1693 | msg.msg_controllen = sizeof adata; | |
1694 | iov.iov_base = buf; | |
1695 | iov.iov_len = size; | |
1696 | ||
1697 | ret = recvmsg(sock, &msg, 0); | |
1698 | if (ret < 0) | |
1699 | return ret; | |
718e3744 | 1700 | |
d62a17ae | 1701 | for (ptr = ZCMSG_FIRSTHDR(&msg); ptr != NULL; |
1702 | ptr = CMSG_NXTHDR(&msg, ptr)) | |
1703 | if (ptr->cmsg_level == IPPROTO_IP | |
1704 | && ptr->cmsg_type == IP_PKTINFO) { | |
1705 | struct in_pktinfo *pktinfo; | |
1706 | int i; | |
1707 | ||
1708 | pktinfo = (struct in_pktinfo *)CMSG_DATA(ptr); | |
1709 | i = pktinfo->ipi_ifindex; | |
1710 | } | |
1711 | return ret; | |
718e3744 | 1712 | } |
1713 | ||
1714 | /* RIP packet read function. */ | |
d62a17ae | 1715 | int rip_read_new(struct thread *t) |
1716 | { | |
1717 | int ret; | |
1718 | int sock; | |
1719 | char buf[RIP_PACKET_MAXSIZ]; | |
1720 | struct sockaddr_in from; | |
1721 | ifindex_t ifindex; | |
1722 | ||
1723 | /* Fetch socket then register myself. */ | |
1724 | sock = THREAD_FD(t); | |
1725 | rip_event(RIP_READ, sock); | |
1726 | ||
1727 | /* Read RIP packet. */ | |
1728 | ret = rip_recvmsg(sock, buf, RIP_PACKET_MAXSIZ, &from, (int *)&ifindex); | |
1729 | if (ret < 0) { | |
1730 | zlog_warn("Can't read RIP packet: %s", safe_strerror(errno)); | |
1731 | return ret; | |
1732 | } | |
1733 | ||
1734 | return ret; | |
718e3744 | 1735 | } |
1736 | #endif /* RIP_RECVMSG */ | |
1737 | ||
1738 | /* First entry point of RIP packet. */ | |
d62a17ae | 1739 | static int rip_read(struct thread *t) |
1740 | { | |
1741 | int sock; | |
1742 | int ret; | |
1743 | int rtenum; | |
1744 | union rip_buf rip_buf; | |
1745 | struct rip_packet *packet; | |
1746 | struct sockaddr_in from; | |
1747 | int len; | |
1748 | int vrecv; | |
1749 | socklen_t fromlen; | |
1750 | struct interface *ifp = NULL; | |
1751 | struct connected *ifc; | |
1752 | struct rip_interface *ri; | |
1753 | struct prefix p; | |
1754 | ||
1755 | /* Fetch socket then register myself. */ | |
1756 | sock = THREAD_FD(t); | |
1757 | rip->t_read = NULL; | |
1758 | ||
1759 | /* Add myself to tne next event */ | |
1760 | rip_event(RIP_READ, sock); | |
1761 | ||
1762 | /* RIPd manages only IPv4. */ | |
1763 | memset(&from, 0, sizeof(struct sockaddr_in)); | |
1764 | fromlen = sizeof(struct sockaddr_in); | |
1765 | ||
1766 | len = recvfrom(sock, (char *)&rip_buf.buf, sizeof(rip_buf.buf), 0, | |
1767 | (struct sockaddr *)&from, &fromlen); | |
1768 | if (len < 0) { | |
1769 | zlog_info("recvfrom failed: %s", safe_strerror(errno)); | |
1770 | return len; | |
1771 | } | |
1772 | ||
1773 | /* Check is this packet comming from myself? */ | |
1774 | if (if_check_address(from.sin_addr)) { | |
1775 | if (IS_RIP_DEBUG_PACKET) | |
1776 | zlog_debug("ignore packet comes from myself"); | |
1777 | return -1; | |
1778 | } | |
1779 | ||
1780 | /* Which interface is this packet comes from. */ | |
1781 | ifc = if_lookup_address((void *)&from.sin_addr, AF_INET, VRF_DEFAULT); | |
1782 | if (ifc) | |
1783 | ifp = ifc->ifp; | |
1784 | ||
1785 | /* RIP packet received */ | |
1786 | if (IS_RIP_DEBUG_EVENT) | |
1787 | zlog_debug("RECV packet from %s port %d on %s", | |
1788 | inet_ntoa(from.sin_addr), ntohs(from.sin_port), | |
1789 | ifp ? ifp->name : "unknown"); | |
1790 | ||
1791 | /* If this packet come from unknown interface, ignore it. */ | |
1792 | if (ifp == NULL) { | |
1793 | zlog_info( | |
1794 | "rip_read: cannot find interface for packet from %s port %d", | |
1795 | inet_ntoa(from.sin_addr), ntohs(from.sin_port)); | |
1796 | return -1; | |
1797 | } | |
1798 | ||
1799 | p.family = AF_INET; | |
1800 | p.u.prefix4 = from.sin_addr; | |
1801 | p.prefixlen = IPV4_MAX_BITLEN; | |
1802 | ||
1803 | ifc = connected_lookup_prefix(ifp, &p); | |
1804 | ||
1805 | if (ifc == NULL) { | |
1806 | zlog_info( | |
1807 | "rip_read: cannot find connected address for packet from %s " | |
1808 | "port %d on interface %s", | |
1809 | inet_ntoa(from.sin_addr), ntohs(from.sin_port), | |
1810 | ifp->name); | |
1811 | return -1; | |
1812 | } | |
1813 | ||
1814 | /* Packet length check. */ | |
1815 | if (len < RIP_PACKET_MINSIZ) { | |
1816 | zlog_warn("packet size %d is smaller than minimum size %d", len, | |
1817 | RIP_PACKET_MINSIZ); | |
1818 | rip_peer_bad_packet(&from); | |
1819 | return len; | |
1820 | } | |
1821 | if (len > RIP_PACKET_MAXSIZ) { | |
1822 | zlog_warn("packet size %d is larger than max size %d", len, | |
1823 | RIP_PACKET_MAXSIZ); | |
1824 | rip_peer_bad_packet(&from); | |
1825 | return len; | |
1826 | } | |
1827 | ||
1828 | /* Packet alignment check. */ | |
1829 | if ((len - RIP_PACKET_MINSIZ) % 20) { | |
1830 | zlog_warn("packet size %d is wrong for RIP packet alignment", | |
1831 | len); | |
1832 | rip_peer_bad_packet(&from); | |
1833 | return len; | |
1834 | } | |
1835 | ||
1836 | /* Set RTE number. */ | |
1837 | rtenum = ((len - RIP_PACKET_MINSIZ) / 20); | |
1838 | ||
1839 | /* For easy to handle. */ | |
1840 | packet = &rip_buf.rip_packet; | |
1841 | ||
1842 | /* RIP version check. */ | |
1843 | if (packet->version == 0) { | |
1844 | zlog_info("version 0 with command %d received.", | |
1845 | packet->command); | |
1846 | rip_peer_bad_packet(&from); | |
1847 | return -1; | |
1848 | } | |
1849 | ||
1850 | /* Dump RIP packet. */ | |
1851 | if (IS_RIP_DEBUG_RECV) | |
1852 | rip_packet_dump(packet, len, "RECV"); | |
1853 | ||
1854 | /* RIP version adjust. This code should rethink now. RFC1058 says | |
1855 | that "Version 1 implementations are to ignore this extra data and | |
1856 | process only the fields specified in this document.". So RIPv3 | |
1857 | packet should be treated as RIPv1 ignoring must be zero field. */ | |
1858 | if (packet->version > RIPv2) | |
1859 | packet->version = RIPv2; | |
1860 | ||
1861 | /* Is RIP running or is this RIP neighbor ?*/ | |
1862 | ri = ifp->info; | |
1863 | if (!ri->running && !rip_neighbor_lookup(&from)) { | |
1864 | if (IS_RIP_DEBUG_EVENT) | |
1865 | zlog_debug("RIP is not enabled on interface %s.", | |
1866 | ifp->name); | |
1867 | rip_peer_bad_packet(&from); | |
1868 | return -1; | |
1869 | } | |
1870 | ||
1871 | /* RIP Version check. RFC2453, 4.6 and 5.1 */ | |
1872 | vrecv = ((ri->ri_receive == RI_RIP_UNSPEC) ? rip->version_recv | |
1873 | : ri->ri_receive); | |
1874 | if (vrecv == RI_RIP_VERSION_NONE | |
1875 | || ((packet->version == RIPv1) && !(vrecv & RIPv1)) | |
1876 | || ((packet->version == RIPv2) && !(vrecv & RIPv2))) { | |
1877 | if (IS_RIP_DEBUG_PACKET) | |
1878 | zlog_debug( | |
1879 | " packet's v%d doesn't fit to if version spec", | |
1880 | packet->version); | |
1881 | rip_peer_bad_packet(&from); | |
1882 | return -1; | |
1883 | } | |
1884 | ||
1885 | /* RFC2453 5.2 If the router is not configured to authenticate RIP-2 | |
1886 | messages, then RIP-1 and unauthenticated RIP-2 messages will be | |
1887 | accepted; authenticated RIP-2 messages shall be discarded. */ | |
1888 | if ((ri->auth_type == RIP_NO_AUTH) && rtenum | |
1889 | && (packet->version == RIPv2) | |
1890 | && (packet->rte->family == htons(RIP_FAMILY_AUTH))) { | |
1891 | if (IS_RIP_DEBUG_EVENT) | |
1892 | zlog_debug( | |
1893 | "packet RIPv%d is dropped because authentication disabled", | |
1894 | packet->version); | |
1895 | rip_peer_bad_packet(&from); | |
1896 | return -1; | |
1897 | } | |
1898 | ||
1899 | /* RFC: | |
1900 | If the router is configured to authenticate RIP-2 messages, then | |
1901 | RIP-1 messages and RIP-2 messages which pass authentication | |
1902 | testing shall be accepted; unauthenticated and failed | |
1903 | authentication RIP-2 messages shall be discarded. For maximum | |
1904 | security, RIP-1 messages should be ignored when authentication is | |
1905 | in use (see section 4.1); otherwise, the routing information from | |
1906 | authenticated messages will be propagated by RIP-1 routers in an | |
1907 | unauthenticated manner. | |
1908 | */ | |
1909 | /* We make an exception for RIPv1 REQUEST packets, to which we'll | |
1910 | * always reply regardless of authentication settings, because: | |
1911 | * | |
1912 | * - if there other authorised routers on-link, the REQUESTor can | |
1913 | * passively obtain the routing updates anyway | |
1914 | * - if there are no other authorised routers on-link, RIP can | |
1915 | * easily be disabled for the link to prevent giving out information | |
1916 | * on state of this routers RIP routing table.. | |
1917 | * | |
1918 | * I.e. if RIPv1 has any place anymore these days, it's as a very | |
1919 | * simple way to distribute routing information (e.g. to embedded | |
1920 | * hosts / appliances) and the ability to give out RIPv1 | |
1921 | * routing-information freely, while still requiring RIPv2 | |
1922 | * authentication for any RESPONSEs might be vaguely useful. | |
1923 | */ | |
1924 | if (ri->auth_type != RIP_NO_AUTH && packet->version == RIPv1) { | |
1925 | /* Discard RIPv1 messages other than REQUESTs */ | |
1926 | if (packet->command != RIP_REQUEST) { | |
1927 | if (IS_RIP_DEBUG_PACKET) | |
1928 | zlog_debug( | |
1929 | "RIPv1" | |
1930 | " dropped because authentication enabled"); | |
1931 | rip_peer_bad_packet(&from); | |
1932 | return -1; | |
1933 | } | |
1934 | } else if (ri->auth_type != RIP_NO_AUTH) { | |
1935 | const char *auth_desc; | |
1936 | ||
1937 | if (rtenum == 0) { | |
1938 | /* There definitely is no authentication in the packet. | |
1939 | */ | |
1940 | if (IS_RIP_DEBUG_PACKET) | |
1941 | zlog_debug( | |
1942 | "RIPv2 authentication failed: no auth RTE in packet"); | |
1943 | rip_peer_bad_packet(&from); | |
1944 | return -1; | |
1945 | } | |
1946 | ||
1947 | /* First RTE must be an Authentication Family RTE */ | |
1948 | if (packet->rte->family != htons(RIP_FAMILY_AUTH)) { | |
1949 | if (IS_RIP_DEBUG_PACKET) | |
1950 | zlog_debug( | |
1951 | "RIPv2" | |
1952 | " dropped because authentication enabled"); | |
1953 | rip_peer_bad_packet(&from); | |
1954 | return -1; | |
1955 | } | |
1956 | ||
1957 | /* Check RIPv2 authentication. */ | |
1958 | switch (ntohs(packet->rte->tag)) { | |
1959 | case RIP_AUTH_SIMPLE_PASSWORD: | |
1960 | auth_desc = "simple"; | |
1961 | ret = rip_auth_simple_password(packet->rte, &from, ifp); | |
1962 | break; | |
1963 | ||
1964 | case RIP_AUTH_MD5: | |
1965 | auth_desc = "MD5"; | |
1966 | ret = rip_auth_md5(packet, &from, len, ifp); | |
1967 | /* Reset RIP packet length to trim MD5 data. */ | |
1968 | len = ret; | |
1969 | break; | |
1970 | ||
1971 | default: | |
1972 | ret = 0; | |
1973 | auth_desc = "unknown type"; | |
1974 | if (IS_RIP_DEBUG_PACKET) | |
1975 | zlog_debug( | |
1976 | "RIPv2 Unknown authentication type %d", | |
1977 | ntohs(packet->rte->tag)); | |
1978 | } | |
1979 | ||
1980 | if (ret) { | |
1981 | if (IS_RIP_DEBUG_PACKET) | |
1982 | zlog_debug("RIPv2 %s authentication success", | |
1983 | auth_desc); | |
1984 | } else { | |
1985 | if (IS_RIP_DEBUG_PACKET) | |
1986 | zlog_debug("RIPv2 %s authentication failure", | |
1987 | auth_desc); | |
1988 | rip_peer_bad_packet(&from); | |
1989 | return -1; | |
1990 | } | |
1991 | } | |
1992 | ||
1993 | /* Process each command. */ | |
1994 | switch (packet->command) { | |
1995 | case RIP_RESPONSE: | |
1996 | rip_response_process(packet, len, &from, ifc); | |
1997 | break; | |
1998 | case RIP_REQUEST: | |
1999 | case RIP_POLL: | |
2000 | rip_request_process(packet, len, &from, ifc); | |
2001 | break; | |
2002 | case RIP_TRACEON: | |
2003 | case RIP_TRACEOFF: | |
2004 | zlog_info( | |
2005 | "Obsolete command %s received, please sent it to routed", | |
2006 | lookup_msg(rip_msg, packet->command, NULL)); | |
2007 | rip_peer_bad_packet(&from); | |
2008 | break; | |
2009 | case RIP_POLL_ENTRY: | |
2010 | zlog_info("Obsolete command %s received", | |
2011 | lookup_msg(rip_msg, packet->command, NULL)); | |
2012 | rip_peer_bad_packet(&from); | |
2013 | break; | |
2014 | default: | |
2015 | zlog_info("Unknown RIP command %d received", packet->command); | |
2016 | rip_peer_bad_packet(&from); | |
2017 | break; | |
2018 | } | |
2019 | ||
2020 | return len; | |
718e3744 | 2021 | } |
2022 | ||
718e3744 | 2023 | /* Write routing table entry to the stream and return next index of |
2024 | the routing table entry in the stream. */ | |
d62a17ae | 2025 | static int rip_write_rte(int num, struct stream *s, struct prefix_ipv4 *p, |
2026 | u_char version, struct rip_info *rinfo) | |
2027 | { | |
2028 | struct in_addr mask; | |
2029 | ||
2030 | /* Write routing table entry. */ | |
2031 | if (version == RIPv1) { | |
2032 | stream_putw(s, AF_INET); | |
2033 | stream_putw(s, 0); | |
2034 | stream_put_ipv4(s, p->prefix.s_addr); | |
2035 | stream_put_ipv4(s, 0); | |
2036 | stream_put_ipv4(s, 0); | |
2037 | stream_putl(s, rinfo->metric_out); | |
2038 | } else { | |
2039 | masklen2ip(p->prefixlen, &mask); | |
2040 | ||
2041 | stream_putw(s, AF_INET); | |
2042 | stream_putw(s, rinfo->tag_out); | |
2043 | stream_put_ipv4(s, p->prefix.s_addr); | |
2044 | stream_put_ipv4(s, mask.s_addr); | |
2045 | stream_put_ipv4(s, rinfo->nexthop_out.s_addr); | |
2046 | stream_putl(s, rinfo->metric_out); | |
2047 | } | |
2048 | ||
2049 | return ++num; | |
718e3744 | 2050 | } |
2051 | ||
2052 | /* Send update to the ifp or spcified neighbor. */ | |
d62a17ae | 2053 | void rip_output_process(struct connected *ifc, struct sockaddr_in *to, |
2054 | int route_type, u_char version) | |
2055 | { | |
2056 | int ret; | |
2057 | struct stream *s; | |
2058 | struct route_node *rp; | |
2059 | struct rip_info *rinfo; | |
2060 | struct rip_interface *ri; | |
2061 | struct prefix_ipv4 *p; | |
2062 | struct prefix_ipv4 classfull; | |
2063 | struct prefix_ipv4 ifaddrclass; | |
2064 | struct key *key = NULL; | |
2065 | /* this might need to made dynamic if RIP ever supported auth methods | |
2066 | with larger key string sizes */ | |
2067 | char auth_str[RIP_AUTH_SIMPLE_SIZE]; | |
2068 | size_t doff = 0; /* offset of digest offset field */ | |
2069 | int num = 0; | |
2070 | int rtemax; | |
2071 | int subnetted = 0; | |
2072 | struct list *list = NULL; | |
2073 | struct listnode *listnode = NULL; | |
2074 | ||
2075 | /* Logging output event. */ | |
2076 | if (IS_RIP_DEBUG_EVENT) { | |
2077 | if (to) | |
2078 | zlog_debug("update routes to neighbor %s", | |
2079 | inet_ntoa(to->sin_addr)); | |
2080 | else | |
2081 | zlog_debug("update routes on interface %s ifindex %d", | |
2082 | ifc->ifp->name, ifc->ifp->ifindex); | |
2083 | } | |
718e3744 | 2084 | |
d62a17ae | 2085 | /* Set output stream. */ |
2086 | s = rip->obuf; | |
2087 | ||
2088 | /* Reset stream and RTE counter. */ | |
2089 | stream_reset(s); | |
2090 | rtemax = RIP_MAX_RTE; | |
2091 | ||
2092 | /* Get RIP interface. */ | |
2093 | ri = ifc->ifp->info; | |
2094 | ||
2095 | /* If output interface is in simple password authentication mode, we | |
2096 | need space for authentication data. */ | |
2097 | if (ri->auth_type == RIP_AUTH_SIMPLE_PASSWORD) | |
2098 | rtemax -= 1; | |
2099 | ||
2100 | /* If output interface is in MD5 authentication mode, we need space | |
2101 | for authentication header and data. */ | |
2102 | if (ri->auth_type == RIP_AUTH_MD5) | |
2103 | rtemax -= 2; | |
2104 | ||
2105 | /* If output interface is in simple password authentication mode | |
2106 | and string or keychain is specified we need space for auth. data */ | |
2107 | if (ri->auth_type != RIP_NO_AUTH) { | |
2108 | if (ri->key_chain) { | |
2109 | struct keychain *keychain; | |
2110 | ||
2111 | keychain = keychain_lookup(ri->key_chain); | |
2112 | if (keychain) | |
2113 | key = key_lookup_for_send(keychain); | |
2114 | } | |
2115 | /* to be passed to auth functions later */ | |
2116 | rip_auth_prepare_str_send(ri, key, auth_str, | |
2117 | RIP_AUTH_SIMPLE_SIZE); | |
2118 | } | |
2119 | ||
2120 | if (version == RIPv1) { | |
2121 | memcpy(&ifaddrclass, ifc->address, sizeof(struct prefix_ipv4)); | |
2122 | apply_classful_mask_ipv4(&ifaddrclass); | |
2123 | subnetted = 0; | |
2124 | if (ifc->address->prefixlen > ifaddrclass.prefixlen) | |
2125 | subnetted = 1; | |
2126 | } | |
2127 | ||
2128 | for (rp = route_top(rip->table); rp; rp = route_next(rp)) | |
2129 | if ((list = rp->info) != NULL && listcount(list) != 0) { | |
2130 | rinfo = listgetdata(listhead(list)); | |
2131 | /* For RIPv1, if we are subnetted, output subnets in our | |
2132 | * network */ | |
2133 | /* that have the same mask as the output "interface". | |
2134 | * For other */ | |
2135 | /* networks, only the classfull version is output. */ | |
2136 | ||
2137 | if (version == RIPv1) { | |
2138 | p = (struct prefix_ipv4 *)&rp->p; | |
2139 | ||
2140 | if (IS_RIP_DEBUG_PACKET) | |
2141 | zlog_debug( | |
2142 | "RIPv1 mask check, %s/%d considered for output", | |
2143 | inet_ntoa(rp->p.u.prefix4), | |
2144 | rp->p.prefixlen); | |
2145 | ||
2146 | if (subnetted | |
2147 | && prefix_match( | |
2148 | (struct prefix *)&ifaddrclass, | |
2149 | &rp->p)) { | |
2150 | if ((ifc->address->prefixlen | |
2151 | != rp->p.prefixlen) | |
2152 | && (rp->p.prefixlen != 32)) | |
2153 | continue; | |
2154 | } else { | |
2155 | memcpy(&classfull, &rp->p, | |
2156 | sizeof(struct prefix_ipv4)); | |
2157 | apply_classful_mask_ipv4(&classfull); | |
2158 | if (rp->p.u.prefix4.s_addr != 0 | |
2159 | && classfull.prefixlen | |
2160 | != rp->p.prefixlen) | |
2161 | continue; | |
2162 | } | |
2163 | if (IS_RIP_DEBUG_PACKET) | |
2164 | zlog_debug( | |
2165 | "RIPv1 mask check, %s/%d made it through", | |
2166 | inet_ntoa(rp->p.u.prefix4), | |
2167 | rp->p.prefixlen); | |
2168 | } else | |
2169 | p = (struct prefix_ipv4 *)&rp->p; | |
2170 | ||
2171 | /* Apply output filters. */ | |
2172 | ret = rip_filter(RIP_FILTER_OUT, p, ri); | |
2173 | if (ret < 0) | |
2174 | continue; | |
2175 | ||
2176 | /* Changed route only output. */ | |
2177 | if (route_type == rip_changed_route | |
2178 | && (!(rinfo->flags & RIP_RTF_CHANGED))) | |
2179 | continue; | |
2180 | ||
2181 | /* Split horizon. */ | |
2182 | /* if (split_horizon == rip_split_horizon) */ | |
2183 | if (ri->split_horizon == RIP_SPLIT_HORIZON) { | |
2184 | /* | |
2185 | * We perform split horizon for RIP and | |
2186 | * connected route. | |
2187 | * For rip routes, we want to suppress the route | |
2188 | * if we would | |
2189 | * end up sending the route back on the | |
2190 | * interface that we | |
2191 | * learned it from, with a higher metric. For | |
2192 | * connected routes, | |
2193 | * we suppress the route if the prefix is a | |
2194 | * subset of the | |
2195 | * source address that we are going to use for | |
2196 | * the packet | |
2197 | * (in order to handle the case when multiple | |
2198 | * subnets are | |
2199 | * configured on the same interface). | |
2200 | */ | |
2201 | int suppress = 0; | |
2202 | struct rip_info *tmp_rinfo = NULL; | |
2203 | ||
2204 | for (ALL_LIST_ELEMENTS_RO(list, listnode, | |
2205 | tmp_rinfo)) | |
2206 | if (tmp_rinfo->type == ZEBRA_ROUTE_RIP | |
2207 | && tmp_rinfo->ifindex | |
2208 | == ifc->ifp->ifindex) { | |
2209 | suppress = 1; | |
2210 | break; | |
2211 | } | |
2212 | ||
2213 | if (!suppress | |
2214 | && rinfo->type == ZEBRA_ROUTE_CONNECT | |
2215 | && prefix_match((struct prefix *)p, | |
2216 | ifc->address)) | |
2217 | suppress = 1; | |
2218 | ||
2219 | if (suppress) | |
2220 | continue; | |
2221 | } | |
2222 | ||
2223 | /* Preparation for route-map. */ | |
2224 | rinfo->metric_set = 0; | |
2225 | rinfo->nexthop_out.s_addr = 0; | |
2226 | rinfo->metric_out = rinfo->metric; | |
2227 | rinfo->tag_out = rinfo->tag; | |
2228 | rinfo->ifindex_out = ifc->ifp->ifindex; | |
2229 | ||
2230 | /* In order to avoid some local loops, | |
2231 | * if the RIP route has a nexthop via this interface, | |
2232 | * keep the nexthop, | |
2233 | * otherwise set it to 0. The nexthop should not be | |
2234 | * propagated | |
2235 | * beyond the local broadcast/multicast area in order | |
2236 | * to avoid an IGP multi-level recursive look-up. | |
2237 | * see (4.4) | |
2238 | */ | |
2239 | if (rinfo->ifindex == ifc->ifp->ifindex) | |
2240 | rinfo->nexthop_out = rinfo->nexthop; | |
2241 | ||
2242 | /* Interface route-map */ | |
2243 | if (ri->routemap[RIP_FILTER_OUT]) { | |
2244 | ret = route_map_apply( | |
2245 | ri->routemap[RIP_FILTER_OUT], | |
2246 | (struct prefix *)p, RMAP_RIP, rinfo); | |
2247 | ||
2248 | if (ret == RMAP_DENYMATCH) { | |
2249 | if (IS_RIP_DEBUG_PACKET) | |
2250 | zlog_debug( | |
2251 | "RIP %s/%d is filtered by route-map out", | |
2252 | inet_ntoa(p->prefix), | |
2253 | p->prefixlen); | |
2254 | continue; | |
2255 | } | |
2256 | } | |
2257 | ||
2258 | /* Apply redistribute route map - continue, if deny */ | |
2259 | if (rip->route_map[rinfo->type].name | |
2260 | && rinfo->sub_type != RIP_ROUTE_INTERFACE) { | |
2261 | ret = route_map_apply( | |
2262 | rip->route_map[rinfo->type].map, | |
2263 | (struct prefix *)p, RMAP_RIP, rinfo); | |
2264 | ||
2265 | if (ret == RMAP_DENYMATCH) { | |
2266 | if (IS_RIP_DEBUG_PACKET) | |
2267 | zlog_debug( | |
2268 | "%s/%d is filtered by route-map", | |
2269 | inet_ntoa(p->prefix), | |
2270 | p->prefixlen); | |
2271 | continue; | |
2272 | } | |
2273 | } | |
2274 | ||
2275 | /* When route-map does not set metric. */ | |
2276 | if (!rinfo->metric_set) { | |
2277 | /* If redistribute metric is set. */ | |
2278 | if (rip->route_map[rinfo->type].metric_config | |
2279 | && rinfo->metric != RIP_METRIC_INFINITY) { | |
2280 | rinfo->metric_out = | |
2281 | rip->route_map[rinfo->type] | |
2282 | .metric; | |
2283 | } else { | |
2284 | /* If the route is not connected or | |
2285 | localy generated | |
2286 | one, use default-metric value*/ | |
2287 | if (rinfo->type != ZEBRA_ROUTE_RIP | |
2288 | && rinfo->type | |
2289 | != ZEBRA_ROUTE_CONNECT | |
2290 | && rinfo->metric | |
2291 | != RIP_METRIC_INFINITY) | |
2292 | rinfo->metric_out = | |
2293 | rip->default_metric; | |
2294 | } | |
2295 | } | |
2296 | ||
2297 | /* Apply offset-list */ | |
2298 | if (rinfo->metric != RIP_METRIC_INFINITY) | |
2299 | rip_offset_list_apply_out(p, ifc->ifp, | |
2300 | &rinfo->metric_out); | |
2301 | ||
2302 | if (rinfo->metric_out > RIP_METRIC_INFINITY) | |
2303 | rinfo->metric_out = RIP_METRIC_INFINITY; | |
2304 | ||
2305 | /* Perform split-horizon with poisoned reverse | |
2306 | * for RIP and connected routes. | |
2307 | **/ | |
2308 | if (ri->split_horizon | |
2309 | == RIP_SPLIT_HORIZON_POISONED_REVERSE) { | |
2310 | /* | |
2311 | * We perform split horizon for RIP and | |
2312 | * connected route. | |
2313 | * For rip routes, we want to suppress the route | |
2314 | * if we would | |
2315 | * end up sending the route back on the | |
2316 | * interface that we | |
2317 | * learned it from, with a higher metric. For | |
2318 | * connected routes, | |
2319 | * we suppress the route if the prefix is a | |
2320 | * subset of the | |
2321 | * source address that we are going to use for | |
2322 | * the packet | |
2323 | * (in order to handle the case when multiple | |
2324 | * subnets are | |
2325 | * configured on the same interface). | |
2326 | */ | |
2327 | struct rip_info *tmp_rinfo = NULL; | |
2328 | ||
2329 | for (ALL_LIST_ELEMENTS_RO(list, listnode, | |
2330 | tmp_rinfo)) | |
2331 | if (tmp_rinfo->type == ZEBRA_ROUTE_RIP | |
2332 | && tmp_rinfo->ifindex | |
2333 | == ifc->ifp->ifindex) | |
2334 | rinfo->metric_out = | |
2335 | RIP_METRIC_INFINITY; | |
2336 | if (tmp_rinfo->type == ZEBRA_ROUTE_CONNECT | |
2337 | && prefix_match((struct prefix *)p, | |
2338 | ifc->address)) | |
2339 | rinfo->metric_out = RIP_METRIC_INFINITY; | |
2340 | } | |
2341 | ||
2342 | /* Prepare preamble, auth headers, if needs be */ | |
2343 | if (num == 0) { | |
2344 | stream_putc(s, RIP_RESPONSE); | |
2345 | stream_putc(s, version); | |
2346 | stream_putw(s, 0); | |
2347 | ||
2348 | /* auth header for !v1 && !no_auth */ | |
2349 | if ((ri->auth_type != RIP_NO_AUTH) | |
2350 | && (version != RIPv1)) | |
2351 | doff = rip_auth_header_write( | |
2352 | s, ri, key, auth_str, | |
2353 | RIP_AUTH_SIMPLE_SIZE); | |
2354 | } | |
2355 | ||
2356 | /* Write RTE to the stream. */ | |
2357 | num = rip_write_rte(num, s, p, version, rinfo); | |
2358 | if (num == rtemax) { | |
2359 | if (version == RIPv2 | |
2360 | && ri->auth_type == RIP_AUTH_MD5) | |
2361 | rip_auth_md5_set(s, ri, doff, auth_str, | |
2362 | RIP_AUTH_SIMPLE_SIZE); | |
2363 | ||
2364 | ret = rip_send_packet(STREAM_DATA(s), | |
2365 | stream_get_endp(s), to, | |
2366 | ifc); | |
2367 | ||
2368 | if (ret >= 0 && IS_RIP_DEBUG_SEND) | |
2369 | rip_packet_dump((struct rip_packet *) | |
2370 | STREAM_DATA(s), | |
2371 | stream_get_endp(s), | |
2372 | "SEND"); | |
2373 | num = 0; | |
2374 | stream_reset(s); | |
2375 | } | |
2376 | } | |
2377 | ||
2378 | /* Flush unwritten RTE. */ | |
2379 | if (num != 0) { | |
2380 | if (version == RIPv2 && ri->auth_type == RIP_AUTH_MD5) | |
2381 | rip_auth_md5_set(s, ri, doff, auth_str, | |
2382 | RIP_AUTH_SIMPLE_SIZE); | |
2383 | ||
2384 | ret = rip_send_packet(STREAM_DATA(s), stream_get_endp(s), to, | |
2385 | ifc); | |
2386 | ||
2387 | if (ret >= 0 && IS_RIP_DEBUG_SEND) | |
2388 | rip_packet_dump((struct rip_packet *)STREAM_DATA(s), | |
2389 | stream_get_endp(s), "SEND"); | |
2390 | stream_reset(s); | |
2391 | } | |
2392 | ||
2393 | /* Statistics updates. */ | |
2394 | ri->sent_updates++; | |
718e3744 | 2395 | } |
2396 | ||
2397 | /* Send RIP packet to the interface. */ | |
d62a17ae | 2398 | static void rip_update_interface(struct connected *ifc, u_char version, |
2399 | int route_type) | |
2400 | { | |
2401 | struct interface *ifp = ifc->ifp; | |
2402 | struct rip_interface *ri = ifp->info; | |
2403 | struct sockaddr_in to; | |
2404 | ||
2405 | /* When RIP version is 2 and multicast enable interface. */ | |
2406 | if (version == RIPv2 && !ri->v2_broadcast && if_is_multicast(ifp)) { | |
2407 | if (IS_RIP_DEBUG_EVENT) | |
2408 | zlog_debug("multicast announce on %s ", ifp->name); | |
2409 | ||
2410 | rip_output_process(ifc, NULL, route_type, version); | |
2411 | return; | |
2412 | } | |
2413 | ||
2414 | /* If we can't send multicast packet, send it with unicast. */ | |
2415 | if (if_is_broadcast(ifp) || if_is_pointopoint(ifp)) { | |
2416 | if (ifc->address->family == AF_INET) { | |
2417 | /* Destination address and port setting. */ | |
2418 | memset(&to, 0, sizeof(struct sockaddr_in)); | |
2419 | if (ifc->destination) | |
2420 | /* use specified broadcast or peer destination | |
2421 | * addr */ | |
2422 | to.sin_addr = ifc->destination->u.prefix4; | |
2423 | else if (ifc->address->prefixlen < IPV4_MAX_PREFIXLEN) | |
2424 | /* calculate the appropriate broadcast address | |
2425 | */ | |
2426 | to.sin_addr.s_addr = ipv4_broadcast_addr( | |
2427 | ifc->address->u.prefix4.s_addr, | |
2428 | ifc->address->prefixlen); | |
2429 | else | |
2430 | /* do not know where to send the packet */ | |
2431 | return; | |
2432 | to.sin_port = htons(RIP_PORT_DEFAULT); | |
2433 | ||
2434 | if (IS_RIP_DEBUG_EVENT) | |
2435 | zlog_debug("%s announce to %s on %s", | |
2436 | CONNECTED_PEER(ifc) ? "unicast" | |
2437 | : "broadcast", | |
2438 | inet_ntoa(to.sin_addr), ifp->name); | |
2439 | ||
2440 | rip_output_process(ifc, &to, route_type, version); | |
2441 | } | |
2442 | } | |
718e3744 | 2443 | } |
2444 | ||
2445 | /* Update send to all interface and neighbor. */ | |
d62a17ae | 2446 | static void rip_update_process(int route_type) |
2447 | { | |
2448 | struct listnode *node; | |
2449 | struct listnode *ifnode, *ifnnode; | |
2450 | struct connected *connected; | |
2451 | struct interface *ifp; | |
2452 | struct rip_interface *ri; | |
2453 | struct route_node *rp; | |
2454 | struct sockaddr_in to; | |
2455 | struct prefix *p; | |
2456 | ||
2457 | /* Send RIP update to each interface. */ | |
2458 | for (ALL_LIST_ELEMENTS_RO(vrf_iflist(VRF_DEFAULT), node, ifp)) { | |
2459 | if (if_is_loopback(ifp)) | |
2460 | continue; | |
2461 | ||
2462 | if (!if_is_operative(ifp)) | |
2463 | continue; | |
2464 | ||
2465 | /* Fetch RIP interface information. */ | |
2466 | ri = ifp->info; | |
2467 | ||
2468 | /* When passive interface is specified, suppress announce to the | |
2469 | interface. */ | |
2470 | if (ri->passive) | |
2471 | continue; | |
2472 | ||
2473 | if (ri->running) { | |
2474 | /* | |
2475 | * If there is no version configuration in the | |
2476 | * interface, | |
2477 | * use rip's version setting. | |
2478 | */ | |
2479 | int vsend = ((ri->ri_send == RI_RIP_UNSPEC) | |
2480 | ? rip->version_send | |
2481 | : ri->ri_send); | |
2482 | ||
2483 | if (IS_RIP_DEBUG_EVENT) | |
2484 | zlog_debug("SEND UPDATE to %s ifindex %d", | |
2485 | ifp->name, ifp->ifindex); | |
2486 | ||
2487 | /* send update on each connected network */ | |
2488 | for (ALL_LIST_ELEMENTS(ifp->connected, ifnode, ifnnode, | |
2489 | connected)) { | |
2490 | if (connected->address->family == AF_INET) { | |
2491 | if (vsend & RIPv1) | |
2492 | rip_update_interface( | |
2493 | connected, RIPv1, | |
2494 | route_type); | |
2495 | if ((vsend & RIPv2) | |
2496 | && if_is_multicast(ifp)) | |
2497 | rip_update_interface( | |
2498 | connected, RIPv2, | |
2499 | route_type); | |
2500 | } | |
2501 | } | |
2502 | } | |
2503 | } | |
2504 | ||
2505 | /* RIP send updates to each neighbor. */ | |
2506 | for (rp = route_top(rip->neighbor); rp; rp = route_next(rp)) | |
2507 | if (rp->info != NULL) { | |
2508 | p = &rp->p; | |
2509 | ||
2510 | connected = if_lookup_address(&p->u.prefix4, AF_INET, | |
2511 | VRF_DEFAULT); | |
2512 | if (!connected) { | |
2513 | zlog_warn( | |
2514 | "Neighbor %s doesnt have connected interface!", | |
2515 | inet_ntoa(p->u.prefix4)); | |
2516 | continue; | |
2517 | } | |
2518 | ||
2519 | /* Set destination address and port */ | |
2520 | memset(&to, 0, sizeof(struct sockaddr_in)); | |
2521 | to.sin_addr = p->u.prefix4; | |
2522 | to.sin_port = htons(RIP_PORT_DEFAULT); | |
2523 | ||
2524 | /* RIP version is rip's configuration. */ | |
2525 | rip_output_process(connected, &to, route_type, | |
2526 | rip->version_send); | |
b9d92881 | 2527 | } |
718e3744 | 2528 | } |
2529 | ||
2530 | /* RIP's periodical timer. */ | |
d62a17ae | 2531 | static int rip_update(struct thread *t) |
718e3744 | 2532 | { |
d62a17ae | 2533 | /* Clear timer pointer. */ |
2534 | rip->t_update = NULL; | |
718e3744 | 2535 | |
d62a17ae | 2536 | if (IS_RIP_DEBUG_EVENT) |
2537 | zlog_debug("update timer fire!"); | |
718e3744 | 2538 | |
d62a17ae | 2539 | /* Process update output. */ |
2540 | rip_update_process(rip_all_route); | |
718e3744 | 2541 | |
d62a17ae | 2542 | /* Triggered updates may be suppressed if a regular update is due by |
2543 | the time the triggered update would be sent. */ | |
2544 | RIP_TIMER_OFF(rip->t_triggered_interval); | |
2545 | rip->trigger = 0; | |
718e3744 | 2546 | |
d62a17ae | 2547 | /* Register myself. */ |
2548 | rip_event(RIP_UPDATE_EVENT, 0); | |
718e3744 | 2549 | |
d62a17ae | 2550 | return 0; |
718e3744 | 2551 | } |
2552 | ||
2553 | /* Walk down the RIP routing table then clear changed flag. */ | |
d62a17ae | 2554 | static void rip_clear_changed_flag(void) |
718e3744 | 2555 | { |
d62a17ae | 2556 | struct route_node *rp; |
2557 | struct rip_info *rinfo = NULL; | |
2558 | struct list *list = NULL; | |
2559 | struct listnode *listnode = NULL; | |
718e3744 | 2560 | |
d62a17ae | 2561 | for (rp = route_top(rip->table); rp; rp = route_next(rp)) |
2562 | if ((list = rp->info) != NULL) | |
2563 | for (ALL_LIST_ELEMENTS_RO(list, listnode, rinfo)) { | |
2564 | UNSET_FLAG(rinfo->flags, RIP_RTF_CHANGED); | |
2565 | /* This flag can be set only on the first entry. | |
2566 | */ | |
2567 | break; | |
2568 | } | |
718e3744 | 2569 | } |
2570 | ||
2571 | /* Triggered update interval timer. */ | |
d62a17ae | 2572 | static int rip_triggered_interval(struct thread *t) |
718e3744 | 2573 | { |
d62a17ae | 2574 | int rip_triggered_update(struct thread *); |
718e3744 | 2575 | |
d62a17ae | 2576 | rip->t_triggered_interval = NULL; |
718e3744 | 2577 | |
d62a17ae | 2578 | if (rip->trigger) { |
2579 | rip->trigger = 0; | |
2580 | rip_triggered_update(t); | |
2581 | } | |
2582 | return 0; | |
2583 | } | |
718e3744 | 2584 | |
2585 | /* Execute triggered update. */ | |
d62a17ae | 2586 | static int rip_triggered_update(struct thread *t) |
718e3744 | 2587 | { |
d62a17ae | 2588 | int interval; |
718e3744 | 2589 | |
d62a17ae | 2590 | /* Clear thred pointer. */ |
2591 | rip->t_triggered_update = NULL; | |
718e3744 | 2592 | |
d62a17ae | 2593 | /* Cancel interval timer. */ |
2594 | RIP_TIMER_OFF(rip->t_triggered_interval); | |
2595 | rip->trigger = 0; | |
718e3744 | 2596 | |
d62a17ae | 2597 | /* Logging triggered update. */ |
2598 | if (IS_RIP_DEBUG_EVENT) | |
2599 | zlog_debug("triggered update!"); | |
718e3744 | 2600 | |
d62a17ae | 2601 | /* Split Horizon processing is done when generating triggered |
2602 | updates as well as normal updates (see section 2.6). */ | |
2603 | rip_update_process(rip_changed_route); | |
718e3744 | 2604 | |
d62a17ae | 2605 | /* Once all of the triggered updates have been generated, the route |
2606 | change flags should be cleared. */ | |
2607 | rip_clear_changed_flag(); | |
718e3744 | 2608 | |
d62a17ae | 2609 | /* After a triggered update is sent, a timer should be set for a |
2610 | random interval between 1 and 5 seconds. If other changes that | |
2611 | would trigger updates occur before the timer expires, a single | |
2612 | update is triggered when the timer expires. */ | |
2613 | interval = (random() % 5) + 1; | |
718e3744 | 2614 | |
d62a17ae | 2615 | rip->t_triggered_interval = NULL; |
2616 | thread_add_timer(master, rip_triggered_interval, NULL, interval, | |
2617 | &rip->t_triggered_interval); | |
718e3744 | 2618 | |
d62a17ae | 2619 | return 0; |
718e3744 | 2620 | } |
2621 | ||
2622 | /* Withdraw redistributed route. */ | |
d62a17ae | 2623 | void rip_redistribute_withdraw(int type) |
2624 | { | |
2625 | struct route_node *rp; | |
2626 | struct rip_info *rinfo = NULL; | |
2627 | struct list *list = NULL; | |
2628 | ||
2629 | if (!rip) | |
2630 | return; | |
2631 | ||
2632 | for (rp = route_top(rip->table); rp; rp = route_next(rp)) | |
2633 | if ((list = rp->info) != NULL) { | |
2634 | rinfo = listgetdata(listhead(list)); | |
2635 | if (rinfo->type == type | |
2636 | && rinfo->sub_type != RIP_ROUTE_INTERFACE) { | |
2637 | /* Perform poisoned reverse. */ | |
2638 | rinfo->metric = RIP_METRIC_INFINITY; | |
2639 | RIP_TIMER_ON(rinfo->t_garbage_collect, | |
2640 | rip_garbage_collect, | |
2641 | rip->garbage_time); | |
2642 | RIP_TIMER_OFF(rinfo->t_timeout); | |
2643 | rinfo->flags |= RIP_RTF_CHANGED; | |
2644 | ||
2645 | if (IS_RIP_DEBUG_EVENT) { | |
2646 | struct prefix_ipv4 *p = | |
2647 | (struct prefix_ipv4 *)&rp->p; | |
2648 | ||
2649 | zlog_debug( | |
2650 | "Poisone %s/%d on the interface %s with an infinity metric [withdraw]", | |
2651 | inet_ntoa(p->prefix), | |
2652 | p->prefixlen, | |
2653 | ifindex2ifname(rinfo->ifindex, | |
2654 | VRF_DEFAULT)); | |
2655 | } | |
2656 | ||
2657 | rip_event(RIP_TRIGGERED_UPDATE, 0); | |
2658 | } | |
2659 | } | |
2660 | } | |
2661 | ||
2662 | /* Create new RIP instance and set it to global variable. */ | |
2663 | static int rip_create(void) | |
718e3744 | 2664 | { |
d62a17ae | 2665 | rip = XCALLOC(MTYPE_RIP, sizeof(struct rip)); |
718e3744 | 2666 | |
d62a17ae | 2667 | /* Set initial value. */ |
2668 | rip->version_send = RI_RIP_VERSION_2; | |
2669 | rip->version_recv = RI_RIP_VERSION_1_AND_2; | |
2670 | rip->update_time = RIP_UPDATE_TIMER_DEFAULT; | |
2671 | rip->timeout_time = RIP_TIMEOUT_TIMER_DEFAULT; | |
2672 | rip->garbage_time = RIP_GARBAGE_TIMER_DEFAULT; | |
2673 | rip->default_metric = RIP_DEFAULT_METRIC_DEFAULT; | |
718e3744 | 2674 | |
d62a17ae | 2675 | /* Initialize RIP routig table. */ |
2676 | rip->table = route_table_init(); | |
2677 | rip->route = route_table_init(); | |
2678 | rip->neighbor = route_table_init(); | |
718e3744 | 2679 | |
d62a17ae | 2680 | /* Make output stream. */ |
2681 | rip->obuf = stream_new(1500); | |
16705130 | 2682 | |
d62a17ae | 2683 | /* Make socket. */ |
2684 | rip->sock = rip_create_socket(); | |
2685 | if (rip->sock < 0) | |
2686 | return rip->sock; | |
16705130 | 2687 | |
d62a17ae | 2688 | /* Create read and timer thread. */ |
2689 | rip_event(RIP_READ, rip->sock); | |
2690 | rip_event(RIP_UPDATE_EVENT, 1); | |
718e3744 | 2691 | |
d62a17ae | 2692 | QOBJ_REG(rip, rip); |
718e3744 | 2693 | |
d62a17ae | 2694 | return 0; |
2695 | } | |
718e3744 | 2696 | |
d62a17ae | 2697 | /* Sned RIP request to the destination. */ |
2698 | int rip_request_send(struct sockaddr_in *to, struct interface *ifp, | |
2699 | u_char version, struct connected *connected) | |
2700 | { | |
2701 | struct rte *rte; | |
2702 | struct rip_packet rip_packet; | |
2703 | struct listnode *node, *nnode; | |
2704 | ||
2705 | memset(&rip_packet, 0, sizeof(rip_packet)); | |
2706 | ||
2707 | rip_packet.command = RIP_REQUEST; | |
2708 | rip_packet.version = version; | |
2709 | rte = rip_packet.rte; | |
2710 | rte->metric = htonl(RIP_METRIC_INFINITY); | |
2711 | ||
2712 | if (connected) { | |
2713 | /* | |
2714 | * connected is only sent for ripv1 case, or when | |
2715 | * interface does not support multicast. Caller loops | |
2716 | * over each connected address for this case. | |
2717 | */ | |
2718 | if (rip_send_packet((u_char *)&rip_packet, sizeof(rip_packet), | |
2719 | to, connected) | |
2720 | != sizeof(rip_packet)) | |
2721 | return -1; | |
2722 | else | |
2723 | return sizeof(rip_packet); | |
2724 | } | |
718e3744 | 2725 | |
d62a17ae | 2726 | /* send request on each connected network */ |
2727 | for (ALL_LIST_ELEMENTS(ifp->connected, node, nnode, connected)) { | |
2728 | struct prefix_ipv4 *p; | |
718e3744 | 2729 | |
d62a17ae | 2730 | p = (struct prefix_ipv4 *)connected->address; |
718e3744 | 2731 | |
d62a17ae | 2732 | if (p->family != AF_INET) |
2733 | continue; | |
f6eacff4 | 2734 | |
d62a17ae | 2735 | if (rip_send_packet((u_char *)&rip_packet, sizeof(rip_packet), |
2736 | to, connected) | |
2737 | != sizeof(rip_packet)) | |
2738 | return -1; | |
2739 | } | |
2740 | return sizeof(rip_packet); | |
718e3744 | 2741 | } |
2742 | ||
d62a17ae | 2743 | static int rip_update_jitter(unsigned long time) |
718e3744 | 2744 | { |
239389ba | 2745 | #define JITTER_BOUND 4 |
d62a17ae | 2746 | /* We want to get the jitter to +/- 1/JITTER_BOUND the interval. |
2747 | Given that, we cannot let time be less than JITTER_BOUND seconds. | |
2748 | The RIPv2 RFC says jitter should be small compared to | |
2749 | update_time. We consider 1/JITTER_BOUND to be small. | |
2750 | */ | |
2751 | ||
2752 | int jitter_input = time; | |
2753 | int jitter; | |
2754 | ||
2755 | if (jitter_input < JITTER_BOUND) | |
2756 | jitter_input = JITTER_BOUND; | |
2757 | ||
2758 | jitter = (((random() % ((jitter_input * 2) + 1)) - jitter_input)); | |
2759 | ||
2760 | return jitter / JITTER_BOUND; | |
2761 | } | |
2762 | ||
2763 | void rip_event(enum rip_event event, int sock) | |
2764 | { | |
2765 | int jitter = 0; | |
2766 | ||
2767 | switch (event) { | |
2768 | case RIP_READ: | |
2769 | rip->t_read = NULL; | |
2770 | thread_add_read(master, rip_read, NULL, sock, &rip->t_read); | |
2771 | break; | |
2772 | case RIP_UPDATE_EVENT: | |
2773 | RIP_TIMER_OFF(rip->t_update); | |
2774 | jitter = rip_update_jitter(rip->update_time); | |
2775 | thread_add_timer(master, rip_update, NULL, | |
2776 | sock ? 2 : rip->update_time + jitter, | |
2777 | &rip->t_update); | |
2778 | break; | |
2779 | case RIP_TRIGGERED_UPDATE: | |
2780 | if (rip->t_triggered_interval) | |
2781 | rip->trigger = 1; | |
2782 | else | |
2783 | thread_add_event(master, rip_triggered_update, NULL, 0, | |
2784 | &rip->t_triggered_update); | |
2785 | break; | |
2786 | default: | |
2787 | break; | |
2788 | } | |
718e3744 | 2789 | } |
6b0655a2 | 2790 | |
505e5056 | 2791 | DEFUN_NOSH (router_rip, |
718e3744 | 2792 | router_rip_cmd, |
2793 | "router rip", | |
2794 | "Enable a routing process\n" | |
2795 | "Routing Information Protocol (RIP)\n") | |
2796 | { | |
d62a17ae | 2797 | int ret; |
718e3744 | 2798 | |
d62a17ae | 2799 | /* If rip is not enabled before. */ |
2800 | if (!rip) { | |
2801 | ret = rip_create(); | |
2802 | if (ret < 0) { | |
2803 | zlog_info("Can't create RIP"); | |
2804 | return CMD_WARNING_CONFIG_FAILED; | |
2805 | } | |
718e3744 | 2806 | } |
d62a17ae | 2807 | VTY_PUSH_CONTEXT(RIP_NODE, rip); |
718e3744 | 2808 | |
d62a17ae | 2809 | return CMD_SUCCESS; |
718e3744 | 2810 | } |
2811 | ||
2812 | DEFUN (no_router_rip, | |
2813 | no_router_rip_cmd, | |
2814 | "no router rip", | |
2815 | NO_STR | |
2816 | "Enable a routing process\n" | |
2817 | "Routing Information Protocol (RIP)\n") | |
2818 | { | |
d62a17ae | 2819 | if (rip) |
2820 | rip_clean(); | |
2821 | return CMD_SUCCESS; | |
718e3744 | 2822 | } |
2823 | ||
2824 | DEFUN (rip_version, | |
2825 | rip_version_cmd, | |
6147e2c6 | 2826 | "version (1-2)", |
718e3744 | 2827 | "Set routing protocol version\n" |
2828 | "version\n") | |
2829 | { | |
d62a17ae | 2830 | int idx_number = 1; |
2831 | int version; | |
718e3744 | 2832 | |
d62a17ae | 2833 | version = atoi(argv[idx_number]->arg); |
2834 | if (version != RIPv1 && version != RIPv2) { | |
2835 | vty_out(vty, "invalid rip version %d\n", version); | |
2836 | return CMD_WARNING_CONFIG_FAILED; | |
2837 | } | |
2838 | rip->version_send = version; | |
2839 | rip->version_recv = version; | |
718e3744 | 2840 | |
d62a17ae | 2841 | return CMD_SUCCESS; |
80fa0c69 | 2842 | } |
718e3744 | 2843 | |
2844 | DEFUN (no_rip_version, | |
2845 | no_rip_version_cmd, | |
55c727dd | 2846 | "no version [(1-2)]", |
718e3744 | 2847 | NO_STR |
55c727dd QY |
2848 | "Set routing protocol version\n" |
2849 | "Version\n") | |
718e3744 | 2850 | { |
d62a17ae | 2851 | /* Set RIP version to the default. */ |
2852 | rip->version_send = RI_RIP_VERSION_2; | |
2853 | rip->version_recv = RI_RIP_VERSION_1_AND_2; | |
718e3744 | 2854 | |
d62a17ae | 2855 | return CMD_SUCCESS; |
80fa0c69 | 2856 | } |
718e3744 | 2857 | |
718e3744 | 2858 | |
2859 | DEFUN (rip_route, | |
2860 | rip_route_cmd, | |
2861 | "route A.B.C.D/M", | |
2862 | "RIP static route configuration\n" | |
2863 | "IP prefix <network>/<length>\n") | |
2864 | { | |
d62a17ae | 2865 | int idx_ipv4_prefixlen = 1; |
2866 | int ret; | |
2867 | struct prefix_ipv4 p; | |
2868 | struct route_node *node; | |
718e3744 | 2869 | |
d62a17ae | 2870 | ret = str2prefix_ipv4(argv[idx_ipv4_prefixlen]->arg, &p); |
2871 | if (ret < 0) { | |
2872 | vty_out(vty, "Malformed address\n"); | |
2873 | return CMD_WARNING_CONFIG_FAILED; | |
2874 | } | |
2875 | apply_mask_ipv4(&p); | |
718e3744 | 2876 | |
d62a17ae | 2877 | /* For router rip configuration. */ |
2878 | node = route_node_get(rip->route, (struct prefix *)&p); | |
718e3744 | 2879 | |
d62a17ae | 2880 | if (node->info) { |
2881 | vty_out(vty, "There is already same static route.\n"); | |
2882 | route_unlock_node(node); | |
2883 | return CMD_WARNING_CONFIG_FAILED; | |
2884 | } | |
718e3744 | 2885 | |
d62a17ae | 2886 | node->info = (void *)1; |
718e3744 | 2887 | |
d62a17ae | 2888 | rip_redistribute_add(ZEBRA_ROUTE_RIP, RIP_ROUTE_STATIC, &p, 0, NULL, 0, |
2889 | 0, 0); | |
718e3744 | 2890 | |
d62a17ae | 2891 | return CMD_SUCCESS; |
718e3744 | 2892 | } |
2893 | ||
2894 | DEFUN (no_rip_route, | |
2895 | no_rip_route_cmd, | |
2896 | "no route A.B.C.D/M", | |
2897 | NO_STR | |
2898 | "RIP static route configuration\n" | |
2899 | "IP prefix <network>/<length>\n") | |
2900 | { | |
d62a17ae | 2901 | int idx_ipv4_prefixlen = 2; |
2902 | int ret; | |
2903 | struct prefix_ipv4 p; | |
2904 | struct route_node *node; | |
718e3744 | 2905 | |
d62a17ae | 2906 | ret = str2prefix_ipv4(argv[idx_ipv4_prefixlen]->arg, &p); |
2907 | if (ret < 0) { | |
2908 | vty_out(vty, "Malformed address\n"); | |
2909 | return CMD_WARNING_CONFIG_FAILED; | |
2910 | } | |
2911 | apply_mask_ipv4(&p); | |
2912 | ||
2913 | /* For router rip configuration. */ | |
2914 | node = route_node_lookup(rip->route, (struct prefix *)&p); | |
2915 | if (!node) { | |
2916 | vty_out(vty, "Can't find route %s.\n", | |
2917 | argv[idx_ipv4_prefixlen]->arg); | |
2918 | return CMD_WARNING_CONFIG_FAILED; | |
2919 | } | |
718e3744 | 2920 | |
d62a17ae | 2921 | rip_redistribute_delete(ZEBRA_ROUTE_RIP, RIP_ROUTE_STATIC, &p, 0); |
2922 | route_unlock_node(node); | |
718e3744 | 2923 | |
d62a17ae | 2924 | node->info = NULL; |
2925 | route_unlock_node(node); | |
718e3744 | 2926 | |
d62a17ae | 2927 | return CMD_SUCCESS; |
718e3744 | 2928 | } |
2929 | ||
2c239705 | 2930 | #if 0 |
dc63bfd4 | 2931 | static void |
216565ab | 2932 | rip_update_default_metric (void) |
718e3744 | 2933 | { |
2934 | struct route_node *np; | |
bce8e868 LF |
2935 | struct rip_info *rinfo = NULL; |
2936 | struct list *list = NULL; | |
2937 | struct listnode *listnode = NULL; | |
718e3744 | 2938 | |
2939 | for (np = route_top (rip->table); np; np = route_next (np)) | |
bce8e868 LF |
2940 | if ((list = np->info) != NULL) |
2941 | for (ALL_LIST_ELEMENTS_RO (list, listnode, rinfo)) | |
2942 | if (rinfo->type != ZEBRA_ROUTE_RIP && rinfo->type != ZEBRA_ROUTE_CONNECT) | |
2943 | rinfo->metric = rip->default_metric; | |
718e3744 | 2944 | } |
2c239705 | 2945 | #endif |
718e3744 | 2946 | |
2947 | DEFUN (rip_default_metric, | |
2948 | rip_default_metric_cmd, | |
6147e2c6 | 2949 | "default-metric (1-16)", |
718e3744 | 2950 | "Set a metric of redistribute routes\n" |
2951 | "Default metric\n") | |
2952 | { | |
d62a17ae | 2953 | int idx_number = 1; |
2954 | if (rip) { | |
2955 | rip->default_metric = atoi(argv[idx_number]->arg); | |
2956 | /* rip_update_default_metric (); */ | |
2957 | } | |
2958 | return CMD_SUCCESS; | |
718e3744 | 2959 | } |
2960 | ||
2961 | DEFUN (no_rip_default_metric, | |
2962 | no_rip_default_metric_cmd, | |
55c727dd | 2963 | "no default-metric [(1-16)]", |
718e3744 | 2964 | NO_STR |
2965 | "Set a metric of redistribute routes\n" | |
2966 | "Default metric\n") | |
2967 | { | |
d62a17ae | 2968 | if (rip) { |
2969 | rip->default_metric = RIP_DEFAULT_METRIC_DEFAULT; | |
2970 | /* rip_update_default_metric (); */ | |
2971 | } | |
2972 | return CMD_SUCCESS; | |
718e3744 | 2973 | } |
2974 | ||
718e3744 | 2975 | |
2976 | DEFUN (rip_timers, | |
2977 | rip_timers_cmd, | |
6147e2c6 | 2978 | "timers basic (5-2147483647) (5-2147483647) (5-2147483647)", |
718e3744 | 2979 | "Adjust routing timers\n" |
2980 | "Basic routing protocol update timers\n" | |
2981 | "Routing table update timer value in second. Default is 30.\n" | |
2982 | "Routing information timeout timer. Default is 180.\n" | |
2983 | "Garbage collection timer. Default is 120.\n") | |
2984 | { | |
d62a17ae | 2985 | int idx_number = 2; |
2986 | int idx_number_2 = 3; | |
2987 | int idx_number_3 = 4; | |
2988 | unsigned long update; | |
2989 | unsigned long timeout; | |
2990 | unsigned long garbage; | |
2991 | char *endptr = NULL; | |
2992 | unsigned long RIP_TIMER_MAX = 2147483647; | |
2993 | unsigned long RIP_TIMER_MIN = 5; | |
2994 | ||
2995 | update = strtoul(argv[idx_number]->arg, &endptr, 10); | |
2996 | if (update > RIP_TIMER_MAX || update < RIP_TIMER_MIN | |
2997 | || *endptr != '\0') { | |
2998 | vty_out(vty, "update timer value error\n"); | |
2999 | return CMD_WARNING_CONFIG_FAILED; | |
3000 | } | |
3001 | ||
3002 | timeout = strtoul(argv[idx_number_2]->arg, &endptr, 10); | |
3003 | if (timeout > RIP_TIMER_MAX || timeout < RIP_TIMER_MIN | |
3004 | || *endptr != '\0') { | |
3005 | vty_out(vty, "timeout timer value error\n"); | |
3006 | return CMD_WARNING_CONFIG_FAILED; | |
3007 | } | |
3008 | ||
3009 | garbage = strtoul(argv[idx_number_3]->arg, &endptr, 10); | |
3010 | if (garbage > RIP_TIMER_MAX || garbage < RIP_TIMER_MIN | |
3011 | || *endptr != '\0') { | |
3012 | vty_out(vty, "garbage timer value error\n"); | |
3013 | return CMD_WARNING_CONFIG_FAILED; | |
3014 | } | |
3015 | ||
3016 | /* Set each timer value. */ | |
3017 | rip->update_time = update; | |
3018 | rip->timeout_time = timeout; | |
3019 | rip->garbage_time = garbage; | |
3020 | ||
3021 | /* Reset update timer thread. */ | |
3022 | rip_event(RIP_UPDATE_EVENT, 0); | |
3023 | ||
3024 | return CMD_SUCCESS; | |
718e3744 | 3025 | } |
3026 | ||
3027 | DEFUN (no_rip_timers, | |
3028 | no_rip_timers_cmd, | |
55c727dd | 3029 | "no timers basic [(0-65535) (0-65535) (0-65535)]", |
718e3744 | 3030 | NO_STR |
3031 | "Adjust routing timers\n" | |
55c727dd QY |
3032 | "Basic routing protocol update timers\n" |
3033 | "Routing table update timer value in second. Default is 30.\n" | |
3034 | "Routing information timeout timer. Default is 180.\n" | |
3035 | "Garbage collection timer. Default is 120.\n") | |
718e3744 | 3036 | { |
d62a17ae | 3037 | /* Set each timer value to the default. */ |
3038 | rip->update_time = RIP_UPDATE_TIMER_DEFAULT; | |
3039 | rip->timeout_time = RIP_TIMEOUT_TIMER_DEFAULT; | |
3040 | rip->garbage_time = RIP_GARBAGE_TIMER_DEFAULT; | |
718e3744 | 3041 | |
d62a17ae | 3042 | /* Reset update timer thread. */ |
3043 | rip_event(RIP_UPDATE_EVENT, 0); | |
718e3744 | 3044 | |
d62a17ae | 3045 | return CMD_SUCCESS; |
718e3744 | 3046 | } |
16705130 | 3047 | |
16705130 | 3048 | |
718e3744 | 3049 | struct route_table *rip_distance_table; |
3050 | ||
d62a17ae | 3051 | struct rip_distance { |
3052 | /* Distance value for the IP source prefix. */ | |
3053 | u_char distance; | |
718e3744 | 3054 | |
d62a17ae | 3055 | /* Name of the access-list to be matched. */ |
3056 | char *access_list; | |
718e3744 | 3057 | }; |
3058 | ||
d62a17ae | 3059 | static struct rip_distance *rip_distance_new(void) |
718e3744 | 3060 | { |
d62a17ae | 3061 | return XCALLOC(MTYPE_RIP_DISTANCE, sizeof(struct rip_distance)); |
718e3744 | 3062 | } |
3063 | ||
d62a17ae | 3064 | static void rip_distance_free(struct rip_distance *rdistance) |
3065 | { | |
3066 | XFREE(MTYPE_RIP_DISTANCE, rdistance); | |
718e3744 | 3067 | } |
3068 | ||
d62a17ae | 3069 | static int rip_distance_set(struct vty *vty, const char *distance_str, |
3070 | const char *ip_str, const char *access_list_str) | |
718e3744 | 3071 | { |
d62a17ae | 3072 | int ret; |
3073 | struct prefix_ipv4 p; | |
3074 | u_char distance; | |
3075 | struct route_node *rn; | |
3076 | struct rip_distance *rdistance; | |
3077 | ||
3078 | ret = str2prefix_ipv4(ip_str, &p); | |
3079 | if (ret == 0) { | |
3080 | vty_out(vty, "Malformed prefix\n"); | |
3081 | return CMD_WARNING_CONFIG_FAILED; | |
3082 | } | |
3083 | ||
3084 | distance = atoi(distance_str); | |
3085 | ||
3086 | /* Get RIP distance node. */ | |
3087 | rn = route_node_get(rip_distance_table, (struct prefix *)&p); | |
3088 | if (rn->info) { | |
3089 | rdistance = rn->info; | |
3090 | route_unlock_node(rn); | |
3091 | } else { | |
3092 | rdistance = rip_distance_new(); | |
3093 | rn->info = rdistance; | |
3094 | } | |
3095 | ||
3096 | /* Set distance value. */ | |
3097 | rdistance->distance = distance; | |
3098 | ||
3099 | /* Reset access-list configuration. */ | |
3100 | if (rdistance->access_list) { | |
3101 | free(rdistance->access_list); | |
3102 | rdistance->access_list = NULL; | |
3103 | } | |
3104 | if (access_list_str) | |
3105 | rdistance->access_list = strdup(access_list_str); | |
3106 | ||
3107 | return CMD_SUCCESS; | |
3108 | } | |
3109 | ||
3110 | static int rip_distance_unset(struct vty *vty, const char *distance_str, | |
3111 | const char *ip_str, const char *access_list_str) | |
3112 | { | |
3113 | int ret; | |
3114 | struct prefix_ipv4 p; | |
3115 | struct route_node *rn; | |
3116 | struct rip_distance *rdistance; | |
3117 | ||
3118 | ret = str2prefix_ipv4(ip_str, &p); | |
3119 | if (ret == 0) { | |
3120 | vty_out(vty, "Malformed prefix\n"); | |
3121 | return CMD_WARNING_CONFIG_FAILED; | |
3122 | } | |
3123 | ||
3124 | rn = route_node_lookup(rip_distance_table, (struct prefix *)&p); | |
3125 | if (!rn) { | |
3126 | vty_out(vty, "Can't find specified prefix\n"); | |
3127 | return CMD_WARNING_CONFIG_FAILED; | |
3128 | } | |
3129 | ||
3130 | rdistance = rn->info; | |
718e3744 | 3131 | |
718e3744 | 3132 | if (rdistance->access_list) |
d62a17ae | 3133 | free(rdistance->access_list); |
3134 | rip_distance_free(rdistance); | |
3135 | ||
718e3744 | 3136 | rn->info = NULL; |
d62a17ae | 3137 | route_unlock_node(rn); |
3138 | route_unlock_node(rn); | |
3139 | ||
3140 | return CMD_SUCCESS; | |
718e3744 | 3141 | } |
3142 | ||
d62a17ae | 3143 | static void rip_distance_reset(void) |
3144 | { | |
3145 | struct route_node *rn; | |
3146 | struct rip_distance *rdistance; | |
718e3744 | 3147 | |
d62a17ae | 3148 | for (rn = route_top(rip_distance_table); rn; rn = route_next(rn)) |
3149 | if ((rdistance = rn->info) != NULL) { | |
3150 | if (rdistance->access_list) | |
3151 | free(rdistance->access_list); | |
3152 | rip_distance_free(rdistance); | |
3153 | rn->info = NULL; | |
3154 | route_unlock_node(rn); | |
3155 | } | |
3156 | } | |
3157 | ||
3158 | /* Apply RIP information to distance method. */ | |
3159 | u_char rip_distance_apply(struct rip_info *rinfo) | |
3160 | { | |
3161 | struct route_node *rn; | |
3162 | struct prefix_ipv4 p; | |
3163 | struct rip_distance *rdistance; | |
3164 | struct access_list *alist; | |
3165 | ||
3166 | if (!rip) | |
3167 | return 0; | |
3168 | ||
3169 | memset(&p, 0, sizeof(struct prefix_ipv4)); | |
3170 | p.family = AF_INET; | |
3171 | p.prefix = rinfo->from; | |
3172 | p.prefixlen = IPV4_MAX_BITLEN; | |
3173 | ||
3174 | /* Check source address. */ | |
3175 | rn = route_node_match(rip_distance_table, (struct prefix *)&p); | |
3176 | if (rn) { | |
3177 | rdistance = rn->info; | |
3178 | route_unlock_node(rn); | |
3179 | ||
3180 | if (rdistance->access_list) { | |
3181 | alist = access_list_lookup(AFI_IP, | |
3182 | rdistance->access_list); | |
3183 | if (alist == NULL) | |
3184 | return 0; | |
3185 | if (access_list_apply(alist, &rinfo->rp->p) | |
3186 | == FILTER_DENY) | |
3187 | return 0; | |
3188 | ||
3189 | return rdistance->distance; | |
3190 | } else | |
3191 | return rdistance->distance; | |
718e3744 | 3192 | } |
718e3744 | 3193 | |
d62a17ae | 3194 | if (rip->distance) |
3195 | return rip->distance; | |
718e3744 | 3196 | |
d62a17ae | 3197 | return 0; |
718e3744 | 3198 | } |
3199 | ||
d62a17ae | 3200 | static void rip_distance_show(struct vty *vty) |
3201 | { | |
3202 | struct route_node *rn; | |
3203 | struct rip_distance *rdistance; | |
3204 | int header = 1; | |
3205 | char buf[BUFSIZ]; | |
3206 | ||
3207 | vty_out(vty, " Distance: (default is %d)\n", | |
3208 | rip->distance ? rip->distance : ZEBRA_RIP_DISTANCE_DEFAULT); | |
3209 | ||
3210 | for (rn = route_top(rip_distance_table); rn; rn = route_next(rn)) | |
3211 | if ((rdistance = rn->info) != NULL) { | |
3212 | if (header) { | |
3213 | vty_out(vty, | |
3214 | " Address Distance List\n"); | |
3215 | header = 0; | |
3216 | } | |
3217 | sprintf(buf, "%s/%d", inet_ntoa(rn->p.u.prefix4), | |
3218 | rn->p.prefixlen); | |
3219 | vty_out(vty, " %-20s %4d %s\n", buf, | |
3220 | rdistance->distance, | |
3221 | rdistance->access_list ? rdistance->access_list | |
3222 | : ""); | |
3223 | } | |
718e3744 | 3224 | } |
3225 | ||
3226 | DEFUN (rip_distance, | |
3227 | rip_distance_cmd, | |
6147e2c6 | 3228 | "distance (1-255)", |
718e3744 | 3229 | "Administrative distance\n" |
3230 | "Distance value\n") | |
3231 | { | |
d62a17ae | 3232 | int idx_number = 1; |
3233 | rip->distance = atoi(argv[idx_number]->arg); | |
3234 | return CMD_SUCCESS; | |
718e3744 | 3235 | } |
3236 | ||
3237 | DEFUN (no_rip_distance, | |
3238 | no_rip_distance_cmd, | |
6147e2c6 | 3239 | "no distance (1-255)", |
718e3744 | 3240 | NO_STR |
3241 | "Administrative distance\n" | |
3242 | "Distance value\n") | |
3243 | { | |
d62a17ae | 3244 | rip->distance = 0; |
3245 | return CMD_SUCCESS; | |
718e3744 | 3246 | } |
3247 | ||
3248 | DEFUN (rip_distance_source, | |
3249 | rip_distance_source_cmd, | |
6147e2c6 | 3250 | "distance (1-255) A.B.C.D/M", |
718e3744 | 3251 | "Administrative distance\n" |
3252 | "Distance value\n" | |
3253 | "IP source prefix\n") | |
3254 | { | |
d62a17ae | 3255 | int idx_number = 1; |
3256 | int idx_ipv4_prefixlen = 2; | |
3257 | rip_distance_set(vty, argv[idx_number]->arg, | |
3258 | argv[idx_ipv4_prefixlen]->arg, NULL); | |
3259 | return CMD_SUCCESS; | |
718e3744 | 3260 | } |
3261 | ||
3262 | DEFUN (no_rip_distance_source, | |
3263 | no_rip_distance_source_cmd, | |
6147e2c6 | 3264 | "no distance (1-255) A.B.C.D/M", |
718e3744 | 3265 | NO_STR |
3266 | "Administrative distance\n" | |
3267 | "Distance value\n" | |
3268 | "IP source prefix\n") | |
3269 | { | |
d62a17ae | 3270 | int idx_number = 2; |
3271 | int idx_ipv4_prefixlen = 3; | |
3272 | rip_distance_unset(vty, argv[idx_number]->arg, | |
3273 | argv[idx_ipv4_prefixlen]->arg, NULL); | |
3274 | return CMD_SUCCESS; | |
718e3744 | 3275 | } |
3276 | ||
3277 | DEFUN (rip_distance_source_access_list, | |
3278 | rip_distance_source_access_list_cmd, | |
6147e2c6 | 3279 | "distance (1-255) A.B.C.D/M WORD", |
718e3744 | 3280 | "Administrative distance\n" |
3281 | "Distance value\n" | |
3282 | "IP source prefix\n" | |
3283 | "Access list name\n") | |
3284 | { | |
d62a17ae | 3285 | int idx_number = 1; |
3286 | int idx_ipv4_prefixlen = 2; | |
3287 | int idx_word = 3; | |
3288 | rip_distance_set(vty, argv[idx_number]->arg, | |
3289 | argv[idx_ipv4_prefixlen]->arg, argv[idx_word]->arg); | |
3290 | return CMD_SUCCESS; | |
718e3744 | 3291 | } |
3292 | ||
3293 | DEFUN (no_rip_distance_source_access_list, | |
3294 | no_rip_distance_source_access_list_cmd, | |
6147e2c6 | 3295 | "no distance (1-255) A.B.C.D/M WORD", |
718e3744 | 3296 | NO_STR |
3297 | "Administrative distance\n" | |
3298 | "Distance value\n" | |
3299 | "IP source prefix\n" | |
3300 | "Access list name\n") | |
3301 | { | |
d62a17ae | 3302 | int idx_number = 2; |
3303 | int idx_ipv4_prefixlen = 3; | |
3304 | int idx_word = 4; | |
3305 | rip_distance_unset(vty, argv[idx_number]->arg, | |
3306 | argv[idx_ipv4_prefixlen]->arg, argv[idx_word]->arg); | |
3307 | return CMD_SUCCESS; | |
718e3744 | 3308 | } |
6b0655a2 | 3309 | |
8478ae7e | 3310 | /* Update ECMP routes to zebra when ECMP is disabled. */ |
d62a17ae | 3311 | static void rip_ecmp_disable(void) |
3312 | { | |
3313 | struct route_node *rp; | |
3314 | struct rip_info *rinfo, *tmp_rinfo; | |
3315 | struct list *list; | |
3316 | struct listnode *node, *nextnode; | |
3317 | ||
3318 | if (!rip) | |
3319 | return; | |
3320 | ||
3321 | for (rp = route_top(rip->table); rp; rp = route_next(rp)) | |
3322 | if ((list = rp->info) != NULL && listcount(list) > 1) { | |
3323 | rinfo = listgetdata(listhead(list)); | |
3324 | if (!rip_route_rte(rinfo)) | |
3325 | continue; | |
3326 | ||
3327 | /* Drop all other entries, except the first one. */ | |
3328 | for (ALL_LIST_ELEMENTS(list, node, nextnode, tmp_rinfo)) | |
3329 | if (tmp_rinfo != rinfo) { | |
3330 | RIP_TIMER_OFF(tmp_rinfo->t_timeout); | |
3331 | RIP_TIMER_OFF( | |
3332 | tmp_rinfo->t_garbage_collect); | |
3333 | list_delete_node(list, node); | |
3334 | rip_info_free(tmp_rinfo); | |
3335 | } | |
3336 | ||
3337 | /* Update zebra. */ | |
3338 | rip_zebra_ipv4_add(rp); | |
3339 | ||
3340 | /* Set the route change flag. */ | |
3341 | SET_FLAG(rinfo->flags, RIP_RTF_CHANGED); | |
3342 | ||
3343 | /* Signal the output process to trigger an update. */ | |
3344 | rip_event(RIP_TRIGGERED_UPDATE, 0); | |
3345 | } | |
8478ae7e LF |
3346 | } |
3347 | ||
3348 | DEFUN (rip_allow_ecmp, | |
3349 | rip_allow_ecmp_cmd, | |
3350 | "allow-ecmp", | |
3351 | "Allow Equal Cost MultiPath\n") | |
3352 | { | |
d62a17ae | 3353 | if (rip->ecmp) { |
3354 | vty_out(vty, "ECMP is already enabled.\n"); | |
3355 | return CMD_WARNING_CONFIG_FAILED; | |
3356 | } | |
8478ae7e | 3357 | |
d62a17ae | 3358 | rip->ecmp = 1; |
3359 | zlog_info("ECMP is enabled."); | |
3360 | return CMD_SUCCESS; | |
8478ae7e LF |
3361 | } |
3362 | ||
3363 | DEFUN (no_rip_allow_ecmp, | |
3364 | no_rip_allow_ecmp_cmd, | |
3365 | "no allow-ecmp", | |
3366 | NO_STR | |
3367 | "Allow Equal Cost MultiPath\n") | |
3368 | { | |
d62a17ae | 3369 | if (!rip->ecmp) { |
3370 | vty_out(vty, "ECMP is already disabled.\n"); | |
3371 | return CMD_WARNING_CONFIG_FAILED; | |
3372 | } | |
8478ae7e | 3373 | |
d62a17ae | 3374 | rip->ecmp = 0; |
3375 | zlog_info("ECMP is disabled."); | |
3376 | rip_ecmp_disable(); | |
3377 | return CMD_SUCCESS; | |
8478ae7e LF |
3378 | } |
3379 | ||
718e3744 | 3380 | /* Print out routes update time. */ |
d62a17ae | 3381 | static void rip_vty_out_uptime(struct vty *vty, struct rip_info *rinfo) |
718e3744 | 3382 | { |
d62a17ae | 3383 | time_t clock; |
3384 | struct tm *tm; | |
718e3744 | 3385 | #define TIME_BUF 25 |
d62a17ae | 3386 | char timebuf[TIME_BUF]; |
3387 | struct thread *thread; | |
3388 | ||
3389 | if ((thread = rinfo->t_timeout) != NULL) { | |
3390 | clock = thread_timer_remain_second(thread); | |
3391 | tm = gmtime(&clock); | |
3392 | strftime(timebuf, TIME_BUF, "%M:%S", tm); | |
3393 | vty_out(vty, "%5s", timebuf); | |
3394 | } else if ((thread = rinfo->t_garbage_collect) != NULL) { | |
3395 | clock = thread_timer_remain_second(thread); | |
3396 | tm = gmtime(&clock); | |
3397 | strftime(timebuf, TIME_BUF, "%M:%S", tm); | |
3398 | vty_out(vty, "%5s", timebuf); | |
3399 | } | |
3400 | } | |
3401 | ||
3402 | static const char *rip_route_type_print(int sub_type) | |
3403 | { | |
3404 | switch (sub_type) { | |
3405 | case RIP_ROUTE_RTE: | |
3406 | return "n"; | |
3407 | case RIP_ROUTE_STATIC: | |
3408 | return "s"; | |
3409 | case RIP_ROUTE_DEFAULT: | |
3410 | return "d"; | |
3411 | case RIP_ROUTE_REDISTRIBUTE: | |
3412 | return "r"; | |
3413 | case RIP_ROUTE_INTERFACE: | |
3414 | return "i"; | |
3415 | default: | |
3416 | return "?"; | |
3417 | } | |
718e3744 | 3418 | } |
3419 | ||
3420 | DEFUN (show_ip_rip, | |
3421 | show_ip_rip_cmd, | |
3422 | "show ip rip", | |
3423 | SHOW_STR | |
3424 | IP_STR | |
3425 | "Show RIP routes\n") | |
3426 | { | |
d62a17ae | 3427 | struct route_node *np; |
3428 | struct rip_info *rinfo = NULL; | |
3429 | struct list *list = NULL; | |
3430 | struct listnode *listnode = NULL; | |
3431 | ||
3432 | if (!rip) | |
3433 | return CMD_SUCCESS; | |
3434 | ||
3435 | vty_out(vty, | |
3436 | "Codes: R - RIP, C - connected, S - Static, O - OSPF, B - BGP\n" | |
3437 | "Sub-codes:\n" | |
3438 | " (n) - normal, (s) - static, (d) - default, (r) - redistribute,\n" | |
3439 | " (i) - interface\n\n" | |
3440 | " Network Next Hop Metric From Tag Time\n"); | |
3441 | ||
3442 | for (np = route_top(rip->table); np; np = route_next(np)) | |
3443 | if ((list = np->info) != NULL) | |
3444 | for (ALL_LIST_ELEMENTS_RO(list, listnode, rinfo)) { | |
3445 | int len; | |
3446 | ||
3447 | len = vty_out( | |
3448 | vty, "%c(%s) %s/%d", | |
3449 | /* np->lock, For debugging. */ | |
3450 | zebra_route_char(rinfo->type), | |
3451 | rip_route_type_print(rinfo->sub_type), | |
3452 | inet_ntoa(np->p.u.prefix4), | |
3453 | np->p.prefixlen); | |
3454 | ||
3455 | len = 24 - len; | |
3456 | ||
3457 | if (len > 0) | |
3458 | vty_out(vty, "%*s", len, " "); | |
3459 | ||
3460 | if (rinfo->nexthop.s_addr) | |
3461 | vty_out(vty, "%-20s %2d ", | |
3462 | inet_ntoa(rinfo->nexthop), | |
3463 | rinfo->metric); | |
3464 | else | |
3465 | vty_out(vty, | |
3466 | "0.0.0.0 %2d ", | |
3467 | rinfo->metric); | |
3468 | ||
3469 | /* Route which exist in kernel routing table. */ | |
3470 | if ((rinfo->type == ZEBRA_ROUTE_RIP) | |
3471 | && (rinfo->sub_type == RIP_ROUTE_RTE)) { | |
3472 | vty_out(vty, "%-15s ", | |
3473 | inet_ntoa(rinfo->from)); | |
3474 | vty_out(vty, "%3" ROUTE_TAG_PRI " ", | |
3475 | (route_tag_t)rinfo->tag); | |
3476 | rip_vty_out_uptime(vty, rinfo); | |
3477 | } else if (rinfo->metric | |
3478 | == RIP_METRIC_INFINITY) { | |
3479 | vty_out(vty, "self "); | |
3480 | vty_out(vty, "%3" ROUTE_TAG_PRI " ", | |
3481 | (route_tag_t)rinfo->tag); | |
3482 | rip_vty_out_uptime(vty, rinfo); | |
3483 | } else { | |
3484 | if (rinfo->external_metric) { | |
3485 | len = vty_out( | |
3486 | vty, "self (%s:%d)", | |
3487 | zebra_route_string( | |
3488 | rinfo->type), | |
3489 | rinfo->external_metric); | |
3490 | len = 16 - len; | |
3491 | if (len > 0) | |
3492 | vty_out(vty, "%*s", len, | |
3493 | " "); | |
3494 | } else | |
3495 | vty_out(vty, | |
3496 | "self "); | |
3497 | vty_out(vty, "%3" ROUTE_TAG_PRI, | |
3498 | (route_tag_t)rinfo->tag); | |
3499 | } | |
3500 | ||
3501 | vty_out(vty, "\n"); | |
3502 | } | |
3503 | return CMD_SUCCESS; | |
718e3744 | 3504 | } |
3505 | ||
16705130 | 3506 | /* Vincent: formerly, it was show_ip_protocols_rip: "show ip protocols" */ |
3507 | DEFUN (show_ip_rip_status, | |
3508 | show_ip_rip_status_cmd, | |
3509 | "show ip rip status", | |
718e3744 | 3510 | SHOW_STR |
3511 | IP_STR | |
16705130 | 3512 | "Show RIP routes\n" |
718e3744 | 3513 | "IP routing protocol process parameters and statistics\n") |
3514 | { | |
d62a17ae | 3515 | struct listnode *node; |
3516 | struct interface *ifp; | |
3517 | struct rip_interface *ri; | |
3518 | extern const struct message ri_version_msg[]; | |
3519 | const char *send_version; | |
3520 | const char *receive_version; | |
3521 | ||
3522 | if (!rip) | |
3523 | return CMD_SUCCESS; | |
3524 | ||
3525 | vty_out(vty, "Routing Protocol is \"rip\"\n"); | |
3526 | vty_out(vty, " Sending updates every %ld seconds with +/-50%%,", | |
3527 | rip->update_time); | |
3528 | vty_out(vty, " next due in %lu seconds\n", | |
3529 | thread_timer_remain_second(rip->t_update)); | |
3530 | vty_out(vty, " Timeout after %ld seconds,", rip->timeout_time); | |
3531 | vty_out(vty, " garbage collect after %ld seconds\n", rip->garbage_time); | |
3532 | ||
3533 | /* Filtering status show. */ | |
3534 | config_show_distribute(vty); | |
3535 | ||
3536 | /* Default metric information. */ | |
3537 | vty_out(vty, " Default redistribution metric is %d\n", | |
3538 | rip->default_metric); | |
3539 | ||
3540 | /* Redistribute information. */ | |
3541 | vty_out(vty, " Redistributing:"); | |
3542 | config_write_rip_redistribute(vty, 0); | |
3543 | vty_out(vty, "\n"); | |
3544 | ||
3545 | vty_out(vty, " Default version control: send version %s,", | |
3546 | lookup_msg(ri_version_msg, rip->version_send, NULL)); | |
3547 | if (rip->version_recv == RI_RIP_VERSION_1_AND_2) | |
3548 | vty_out(vty, " receive any version \n"); | |
3549 | else | |
3550 | vty_out(vty, " receive version %s \n", | |
3551 | lookup_msg(ri_version_msg, rip->version_recv, NULL)); | |
3552 | ||
3553 | vty_out(vty, " Interface Send Recv Key-chain\n"); | |
3554 | ||
3555 | for (ALL_LIST_ELEMENTS_RO(vrf_iflist(VRF_DEFAULT), node, ifp)) { | |
3556 | ri = ifp->info; | |
3557 | ||
3558 | if (!ri->running) | |
3559 | continue; | |
3560 | ||
3561 | if (ri->enable_network || ri->enable_interface) { | |
3562 | if (ri->ri_send == RI_RIP_UNSPEC) | |
3563 | send_version = | |
3564 | lookup_msg(ri_version_msg, | |
3565 | rip->version_send, NULL); | |
3566 | else | |
3567 | send_version = lookup_msg(ri_version_msg, | |
3568 | ri->ri_send, NULL); | |
3569 | ||
3570 | if (ri->ri_receive == RI_RIP_UNSPEC) | |
3571 | receive_version = | |
3572 | lookup_msg(ri_version_msg, | |
3573 | rip->version_recv, NULL); | |
3574 | else | |
3575 | receive_version = lookup_msg( | |
3576 | ri_version_msg, ri->ri_receive, NULL); | |
3577 | ||
3578 | vty_out(vty, " %-17s%-3s %-3s %s\n", ifp->name, | |
3579 | send_version, receive_version, | |
3580 | ri->key_chain ? ri->key_chain : ""); | |
3581 | } | |
3582 | } | |
718e3744 | 3583 | |
d62a17ae | 3584 | vty_out(vty, " Routing for Networks:\n"); |
3585 | config_write_rip_network(vty, 0); | |
718e3744 | 3586 | |
718e3744 | 3587 | { |
d62a17ae | 3588 | int found_passive = 0; |
3589 | for (ALL_LIST_ELEMENTS_RO(vrf_iflist(VRF_DEFAULT), node, ifp)) { | |
3590 | ri = ifp->info; | |
3591 | ||
3592 | if ((ri->enable_network || ri->enable_interface) | |
3593 | && ri->passive) { | |
3594 | if (!found_passive) { | |
3595 | vty_out(vty, | |
3596 | " Passive Interface(s):\n"); | |
3597 | found_passive = 1; | |
3598 | } | |
3599 | vty_out(vty, " %s\n", ifp->name); | |
3600 | } | |
3601 | } | |
718e3744 | 3602 | } |
3603 | ||
d62a17ae | 3604 | vty_out(vty, " Routing Information Sources:\n"); |
3605 | vty_out(vty, | |
3606 | " Gateway BadPackets BadRoutes Distance Last Update\n"); | |
3607 | rip_peer_display(vty); | |
718e3744 | 3608 | |
d62a17ae | 3609 | rip_distance_show(vty); |
718e3744 | 3610 | |
d62a17ae | 3611 | return CMD_SUCCESS; |
3612 | } | |
718e3744 | 3613 | |
d62a17ae | 3614 | /* RIP configuration write function. */ |
3615 | static int config_write_rip(struct vty *vty) | |
3616 | { | |
3617 | int write = 0; | |
3618 | struct route_node *rn; | |
3619 | struct rip_distance *rdistance; | |
3620 | ||
3621 | if (rip) { | |
3622 | /* Router RIP statement. */ | |
3623 | vty_out(vty, "router rip\n"); | |
3624 | write++; | |
3625 | ||
3626 | /* RIP version statement. Default is RIP version 2. */ | |
3627 | if (rip->version_send != RI_RIP_VERSION_2 | |
3628 | || rip->version_recv != RI_RIP_VERSION_1_AND_2) | |
3629 | vty_out(vty, " version %d\n", rip->version_send); | |
3630 | ||
3631 | /* RIP timer configuration. */ | |
3632 | if (rip->update_time != RIP_UPDATE_TIMER_DEFAULT | |
3633 | || rip->timeout_time != RIP_TIMEOUT_TIMER_DEFAULT | |
3634 | || rip->garbage_time != RIP_GARBAGE_TIMER_DEFAULT) | |
3635 | vty_out(vty, " timers basic %lu %lu %lu\n", | |
3636 | rip->update_time, rip->timeout_time, | |
3637 | rip->garbage_time); | |
3638 | ||
3639 | /* Default information configuration. */ | |
3640 | if (rip->default_information) { | |
3641 | if (rip->default_information_route_map) | |
3642 | vty_out(vty, | |
3643 | " default-information originate route-map %s\n", | |
3644 | rip->default_information_route_map); | |
3645 | else | |
3646 | vty_out(vty, | |
3647 | " default-information originate\n"); | |
3648 | } | |
16705130 | 3649 | |
d62a17ae | 3650 | /* Redistribute configuration. */ |
3651 | config_write_rip_redistribute(vty, 1); | |
3652 | ||
3653 | /* RIP offset-list configuration. */ | |
3654 | config_write_rip_offset_list(vty); | |
3655 | ||
3656 | /* RIP enabled network and interface configuration. */ | |
3657 | config_write_rip_network(vty, 1); | |
3658 | ||
3659 | /* RIP default metric configuration */ | |
3660 | if (rip->default_metric != RIP_DEFAULT_METRIC_DEFAULT) | |
3661 | vty_out(vty, " default-metric %d\n", | |
3662 | rip->default_metric); | |
3663 | ||
3664 | /* Distribute configuration. */ | |
3665 | write += config_write_distribute(vty); | |
3666 | ||
3667 | /* Interface routemap configuration */ | |
3668 | write += config_write_if_rmap(vty); | |
3669 | ||
3670 | /* Distance configuration. */ | |
3671 | if (rip->distance) | |
3672 | vty_out(vty, " distance %d\n", rip->distance); | |
3673 | ||
3674 | /* RIP source IP prefix distance configuration. */ | |
3675 | for (rn = route_top(rip_distance_table); rn; | |
3676 | rn = route_next(rn)) | |
3677 | if ((rdistance = rn->info) != NULL) | |
3678 | vty_out(vty, " distance %d %s/%d %s\n", | |
3679 | rdistance->distance, | |
3680 | inet_ntoa(rn->p.u.prefix4), | |
3681 | rn->p.prefixlen, | |
3682 | rdistance->access_list | |
3683 | ? rdistance->access_list | |
3684 | : ""); | |
3685 | ||
3686 | /* ECMP configuration. */ | |
3687 | if (rip->ecmp) | |
3688 | vty_out(vty, " allow-ecmp\n"); | |
3689 | ||
3690 | /* RIP static route configuration. */ | |
3691 | for (rn = route_top(rip->route); rn; rn = route_next(rn)) | |
3692 | if (rn->info) | |
3693 | vty_out(vty, " route %s/%d\n", | |
3694 | inet_ntoa(rn->p.u.prefix4), | |
3695 | rn->p.prefixlen); | |
3696 | } | |
3697 | return write; | |
3698 | } | |
718e3744 | 3699 | |
d62a17ae | 3700 | /* RIP node structure. */ |
3701 | static struct cmd_node rip_node = {RIP_NODE, "%s(config-router)# ", 1}; | |
718e3744 | 3702 | |
d62a17ae | 3703 | /* Distribute-list update functions. */ |
3704 | static void rip_distribute_update(struct distribute *dist) | |
3705 | { | |
3706 | struct interface *ifp; | |
3707 | struct rip_interface *ri; | |
3708 | struct access_list *alist; | |
3709 | struct prefix_list *plist; | |
8478ae7e | 3710 | |
d62a17ae | 3711 | if (!dist->ifname) |
3712 | return; | |
718e3744 | 3713 | |
d62a17ae | 3714 | ifp = if_lookup_by_name(dist->ifname, VRF_DEFAULT); |
3715 | if (ifp == NULL) | |
3716 | return; | |
718e3744 | 3717 | |
d62a17ae | 3718 | ri = ifp->info; |
6b0655a2 | 3719 | |
d62a17ae | 3720 | if (dist->list[DISTRIBUTE_V4_IN]) { |
3721 | alist = access_list_lookup(AFI_IP, | |
3722 | dist->list[DISTRIBUTE_V4_IN]); | |
3723 | if (alist) | |
3724 | ri->list[RIP_FILTER_IN] = alist; | |
3725 | else | |
3726 | ri->list[RIP_FILTER_IN] = NULL; | |
3727 | } else | |
3728 | ri->list[RIP_FILTER_IN] = NULL; | |
3729 | ||
3730 | if (dist->list[DISTRIBUTE_V4_OUT]) { | |
3731 | alist = access_list_lookup(AFI_IP, | |
3732 | dist->list[DISTRIBUTE_V4_OUT]); | |
3733 | if (alist) | |
3734 | ri->list[RIP_FILTER_OUT] = alist; | |
3735 | else | |
3736 | ri->list[RIP_FILTER_OUT] = NULL; | |
3737 | } else | |
3738 | ri->list[RIP_FILTER_OUT] = NULL; | |
3739 | ||
3740 | if (dist->prefix[DISTRIBUTE_V4_IN]) { | |
3741 | plist = prefix_list_lookup(AFI_IP, | |
3742 | dist->prefix[DISTRIBUTE_V4_IN]); | |
3743 | if (plist) | |
3744 | ri->prefix[RIP_FILTER_IN] = plist; | |
3745 | else | |
3746 | ri->prefix[RIP_FILTER_IN] = NULL; | |
3747 | } else | |
3748 | ri->prefix[RIP_FILTER_IN] = NULL; | |
3749 | ||
3750 | if (dist->prefix[DISTRIBUTE_V4_OUT]) { | |
3751 | plist = prefix_list_lookup(AFI_IP, | |
3752 | dist->prefix[DISTRIBUTE_V4_OUT]); | |
3753 | if (plist) | |
3754 | ri->prefix[RIP_FILTER_OUT] = plist; | |
3755 | else | |
3756 | ri->prefix[RIP_FILTER_OUT] = NULL; | |
3757 | } else | |
3758 | ri->prefix[RIP_FILTER_OUT] = NULL; | |
3759 | } | |
3760 | ||
3761 | void rip_distribute_update_interface(struct interface *ifp) | |
3762 | { | |
3763 | struct distribute *dist; | |
3764 | ||
3765 | dist = distribute_lookup(ifp->name); | |
3766 | if (dist) | |
3767 | rip_distribute_update(dist); | |
718e3744 | 3768 | } |
3769 | ||
3770 | /* Update all interface's distribute list. */ | |
02ff83c5 | 3771 | /* ARGSUSED */ |
d62a17ae | 3772 | static void rip_distribute_update_all(struct prefix_list *notused) |
718e3744 | 3773 | { |
d62a17ae | 3774 | struct interface *ifp; |
3775 | struct listnode *node, *nnode; | |
718e3744 | 3776 | |
d62a17ae | 3777 | for (ALL_LIST_ELEMENTS(vrf_iflist(VRF_DEFAULT), node, nnode, ifp)) |
3778 | rip_distribute_update_interface(ifp); | |
718e3744 | 3779 | } |
11dde9c2 | 3780 | /* ARGSUSED */ |
d62a17ae | 3781 | static void rip_distribute_update_all_wrapper(struct access_list *notused) |
11dde9c2 | 3782 | { |
d62a17ae | 3783 | rip_distribute_update_all(NULL); |
11dde9c2 | 3784 | } |
6b0655a2 | 3785 | |
718e3744 | 3786 | /* Delete all added rip route. */ |
d62a17ae | 3787 | void rip_clean(void) |
718e3744 | 3788 | { |
d62a17ae | 3789 | int i; |
3790 | struct route_node *rp; | |
3791 | struct rip_info *rinfo = NULL; | |
3792 | struct list *list = NULL; | |
3793 | struct listnode *listnode = NULL; | |
3794 | ||
3795 | if (rip) { | |
3796 | QOBJ_UNREG(rip); | |
3797 | ||
3798 | /* Clear RIP routes */ | |
3799 | for (rp = route_top(rip->table); rp; rp = route_next(rp)) | |
3800 | if ((list = rp->info) != NULL) { | |
3801 | rinfo = listgetdata(listhead(list)); | |
3802 | if (rip_route_rte(rinfo)) | |
3803 | rip_zebra_ipv4_delete(rp); | |
3804 | ||
3805 | for (ALL_LIST_ELEMENTS_RO(list, listnode, | |
3806 | rinfo)) { | |
3807 | RIP_TIMER_OFF(rinfo->t_timeout); | |
3808 | RIP_TIMER_OFF(rinfo->t_garbage_collect); | |
3809 | rip_info_free(rinfo); | |
3810 | } | |
3811 | list_delete(list); | |
3812 | rp->info = NULL; | |
3813 | route_unlock_node(rp); | |
3814 | } | |
3815 | ||
3816 | /* Cancel RIP related timers. */ | |
3817 | RIP_TIMER_OFF(rip->t_update); | |
3818 | RIP_TIMER_OFF(rip->t_triggered_update); | |
3819 | RIP_TIMER_OFF(rip->t_triggered_interval); | |
3820 | ||
3821 | /* Cancel read thread. */ | |
3822 | THREAD_READ_OFF(rip->t_read); | |
3823 | ||
3824 | /* Close RIP socket. */ | |
3825 | if (rip->sock >= 0) { | |
3826 | close(rip->sock); | |
3827 | rip->sock = -1; | |
3828 | } | |
718e3744 | 3829 | |
d62a17ae | 3830 | /* Static RIP route configuration. */ |
3831 | for (rp = route_top(rip->route); rp; rp = route_next(rp)) | |
3832 | if (rp->info) { | |
3833 | rp->info = NULL; | |
3834 | route_unlock_node(rp); | |
3835 | } | |
3836 | ||
3837 | /* RIP neighbor configuration. */ | |
3838 | for (rp = route_top(rip->neighbor); rp; rp = route_next(rp)) | |
3839 | if (rp->info) { | |
3840 | rp->info = NULL; | |
3841 | route_unlock_node(rp); | |
3842 | } | |
3843 | ||
3844 | /* Redistribute related clear. */ | |
3845 | if (rip->default_information_route_map) | |
3846 | free(rip->default_information_route_map); | |
3847 | ||
3848 | for (i = 0; i < ZEBRA_ROUTE_MAX; i++) | |
3849 | if (rip->route_map[i].name) | |
3850 | free(rip->route_map[i].name); | |
3851 | ||
3852 | XFREE(MTYPE_ROUTE_TABLE, rip->table); | |
3853 | XFREE(MTYPE_ROUTE_TABLE, rip->route); | |
3854 | XFREE(MTYPE_ROUTE_TABLE, rip->neighbor); | |
3855 | ||
3856 | XFREE(MTYPE_RIP, rip); | |
3857 | rip = NULL; | |
3858 | } | |
3859 | ||
3860 | rip_clean_network(); | |
3861 | rip_passive_nondefault_clean(); | |
3862 | rip_offset_clean(); | |
3863 | rip_interfaces_clean(); | |
3864 | rip_distance_reset(); | |
3865 | rip_redistribute_clean(); | |
718e3744 | 3866 | } |
3867 | ||
3868 | /* Reset all values to the default settings. */ | |
d62a17ae | 3869 | void rip_reset(void) |
718e3744 | 3870 | { |
d62a17ae | 3871 | /* Reset global counters. */ |
3872 | rip_global_route_changes = 0; | |
3873 | rip_global_queries = 0; | |
718e3744 | 3874 | |
d62a17ae | 3875 | /* Call ripd related reset functions. */ |
3876 | rip_debug_reset(); | |
3877 | rip_route_map_reset(); | |
718e3744 | 3878 | |
d62a17ae | 3879 | /* Call library reset functions. */ |
3880 | vty_reset(); | |
3881 | access_list_reset(); | |
3882 | prefix_list_reset(); | |
718e3744 | 3883 | |
d62a17ae | 3884 | distribute_list_reset(); |
718e3744 | 3885 | |
d62a17ae | 3886 | rip_interfaces_reset(); |
3887 | rip_distance_reset(); | |
718e3744 | 3888 | |
d62a17ae | 3889 | rip_zclient_reset(); |
718e3744 | 3890 | } |
3891 | ||
d62a17ae | 3892 | static void rip_if_rmap_update(struct if_rmap *if_rmap) |
16705130 | 3893 | { |
d62a17ae | 3894 | struct interface *ifp; |
3895 | struct rip_interface *ri; | |
3896 | struct route_map *rmap; | |
16705130 | 3897 | |
d62a17ae | 3898 | ifp = if_lookup_by_name(if_rmap->ifname, VRF_DEFAULT); |
3899 | if (ifp == NULL) | |
3900 | return; | |
16705130 | 3901 | |
d62a17ae | 3902 | ri = ifp->info; |
16705130 | 3903 | |
d62a17ae | 3904 | if (if_rmap->routemap[IF_RMAP_IN]) { |
3905 | rmap = route_map_lookup_by_name(if_rmap->routemap[IF_RMAP_IN]); | |
3906 | if (rmap) | |
3907 | ri->routemap[IF_RMAP_IN] = rmap; | |
3908 | else | |
3909 | ri->routemap[IF_RMAP_IN] = NULL; | |
3910 | } else | |
3911 | ri->routemap[RIP_FILTER_IN] = NULL; | |
16705130 | 3912 | |
d62a17ae | 3913 | if (if_rmap->routemap[IF_RMAP_OUT]) { |
3914 | rmap = route_map_lookup_by_name(if_rmap->routemap[IF_RMAP_OUT]); | |
3915 | if (rmap) | |
3916 | ri->routemap[IF_RMAP_OUT] = rmap; | |
3917 | else | |
3918 | ri->routemap[IF_RMAP_OUT] = NULL; | |
3919 | } else | |
3920 | ri->routemap[RIP_FILTER_OUT] = NULL; | |
16705130 | 3921 | } |
3922 | ||
d62a17ae | 3923 | void rip_if_rmap_update_interface(struct interface *ifp) |
16705130 | 3924 | { |
d62a17ae | 3925 | struct if_rmap *if_rmap; |
16705130 | 3926 | |
d62a17ae | 3927 | if_rmap = if_rmap_lookup(ifp->name); |
3928 | if (if_rmap) | |
3929 | rip_if_rmap_update(if_rmap); | |
16705130 | 3930 | } |
3931 | ||
d62a17ae | 3932 | static void rip_routemap_update_redistribute(void) |
16705130 | 3933 | { |
d62a17ae | 3934 | int i; |
16705130 | 3935 | |
d62a17ae | 3936 | if (rip) { |
3937 | for (i = 0; i < ZEBRA_ROUTE_MAX; i++) { | |
3938 | if (rip->route_map[i].name) | |
3939 | rip->route_map[i].map = | |
3940 | route_map_lookup_by_name( | |
3941 | rip->route_map[i].name); | |
3942 | } | |
16705130 | 3943 | } |
16705130 | 3944 | } |
3945 | ||
11dde9c2 | 3946 | /* ARGSUSED */ |
d62a17ae | 3947 | static void rip_routemap_update(const char *notused) |
16705130 | 3948 | { |
d62a17ae | 3949 | struct interface *ifp; |
3950 | struct listnode *node, *nnode; | |
16705130 | 3951 | |
d62a17ae | 3952 | for (ALL_LIST_ELEMENTS(vrf_iflist(VRF_DEFAULT), node, nnode, ifp)) |
3953 | rip_if_rmap_update_interface(ifp); | |
16705130 | 3954 | |
d62a17ae | 3955 | rip_routemap_update_redistribute(); |
16705130 | 3956 | } |
3957 | ||
718e3744 | 3958 | /* Allocate new rip structure and set default value. */ |
d62a17ae | 3959 | void rip_init(void) |
3960 | { | |
3961 | /* Install top nodes. */ | |
3962 | install_node(&rip_node, config_write_rip); | |
3963 | ||
3964 | /* Install rip commands. */ | |
3965 | install_element(VIEW_NODE, &show_ip_rip_cmd); | |
3966 | install_element(VIEW_NODE, &show_ip_rip_status_cmd); | |
3967 | install_element(CONFIG_NODE, &router_rip_cmd); | |
3968 | install_element(CONFIG_NODE, &no_router_rip_cmd); | |
3969 | ||
3970 | install_default(RIP_NODE); | |
3971 | install_element(RIP_NODE, &rip_version_cmd); | |
3972 | install_element(RIP_NODE, &no_rip_version_cmd); | |
3973 | install_element(RIP_NODE, &rip_default_metric_cmd); | |
3974 | install_element(RIP_NODE, &no_rip_default_metric_cmd); | |
3975 | install_element(RIP_NODE, &rip_timers_cmd); | |
3976 | install_element(RIP_NODE, &no_rip_timers_cmd); | |
3977 | install_element(RIP_NODE, &rip_route_cmd); | |
3978 | install_element(RIP_NODE, &no_rip_route_cmd); | |
3979 | install_element(RIP_NODE, &rip_distance_cmd); | |
3980 | install_element(RIP_NODE, &no_rip_distance_cmd); | |
3981 | install_element(RIP_NODE, &rip_distance_source_cmd); | |
3982 | install_element(RIP_NODE, &no_rip_distance_source_cmd); | |
3983 | install_element(RIP_NODE, &rip_distance_source_access_list_cmd); | |
3984 | install_element(RIP_NODE, &no_rip_distance_source_access_list_cmd); | |
3985 | install_element(RIP_NODE, &rip_allow_ecmp_cmd); | |
3986 | install_element(RIP_NODE, &no_rip_allow_ecmp_cmd); | |
3987 | ||
3988 | /* Debug related init. */ | |
3989 | rip_debug_init(); | |
3990 | ||
3991 | /* Access list install. */ | |
3992 | access_list_init(); | |
3993 | access_list_add_hook(rip_distribute_update_all_wrapper); | |
3994 | access_list_delete_hook(rip_distribute_update_all_wrapper); | |
3995 | ||
3996 | /* Prefix list initialize.*/ | |
3997 | prefix_list_init(); | |
3998 | prefix_list_add_hook(rip_distribute_update_all); | |
3999 | prefix_list_delete_hook(rip_distribute_update_all); | |
4000 | ||
4001 | /* Distribute list install. */ | |
4002 | distribute_list_init(RIP_NODE); | |
4003 | distribute_list_add_hook(rip_distribute_update); | |
4004 | distribute_list_delete_hook(rip_distribute_update); | |
4005 | ||
4006 | /* Route-map */ | |
4007 | rip_route_map_init(); | |
4008 | rip_offset_init(); | |
4009 | ||
4010 | route_map_add_hook(rip_routemap_update); | |
4011 | route_map_delete_hook(rip_routemap_update); | |
4012 | ||
4013 | if_rmap_init(RIP_NODE); | |
4014 | if_rmap_hook_add(rip_if_rmap_update); | |
4015 | if_rmap_hook_delete(rip_if_rmap_update); | |
4016 | ||
4017 | /* Distance control. */ | |
4018 | rip_distance_table = route_table_init(); | |
718e3744 | 4019 | } |