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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 | ||
718e3744 | 52 | /* RIP Structure. */ |
53 | struct rip *rip = NULL; | |
54 | ||
55 | /* RIP neighbor address table. */ | |
56 | struct route_table *rip_neighbor_table; | |
57 | ||
58 | /* RIP route changes. */ | |
59 | long rip_global_route_changes = 0; | |
60 | ||
61 | /* RIP queries. */ | |
62 | long rip_global_queries = 0; | |
6b0655a2 | 63 | |
718e3744 | 64 | /* Prototypes. */ |
d62a17ae | 65 | static void rip_event(enum rip_event, int); |
66 | static void rip_output_process(struct connected *, struct sockaddr_in *, int, | |
67 | u_char); | |
68 | static int rip_triggered_update(struct thread *); | |
69 | static int rip_update_jitter(unsigned long); | |
6b0655a2 | 70 | |
718e3744 | 71 | /* RIP output routes type. */ |
d62a17ae | 72 | enum { rip_all_route, rip_changed_route }; |
6b0655a2 | 73 | |
718e3744 | 74 | /* RIP command strings. */ |
d62a17ae | 75 | static const struct message rip_msg[] = {{RIP_REQUEST, "REQUEST"}, |
76 | {RIP_RESPONSE, "RESPONSE"}, | |
77 | {RIP_TRACEON, "TRACEON"}, | |
78 | {RIP_TRACEOFF, "TRACEOFF"}, | |
79 | {RIP_POLL, "POLL"}, | |
80 | {RIP_POLL_ENTRY, "POLL ENTRY"}, | |
81 | {0}}; | |
6b0655a2 | 82 | |
718e3744 | 83 | /* Utility function to set boradcast option to the socket. */ |
d62a17ae | 84 | static int sockopt_broadcast(int sock) |
718e3744 | 85 | { |
d62a17ae | 86 | int ret; |
87 | int on = 1; | |
718e3744 | 88 | |
d62a17ae | 89 | ret = setsockopt(sock, SOL_SOCKET, SO_BROADCAST, (char *)&on, |
90 | sizeof on); | |
91 | if (ret < 0) { | |
92 | zlog_warn("can't set sockopt SO_BROADCAST to socket %d", sock); | |
93 | return -1; | |
94 | } | |
95 | return 0; | |
718e3744 | 96 | } |
97 | ||
d62a17ae | 98 | static int rip_route_rte(struct rip_info *rinfo) |
718e3744 | 99 | { |
d62a17ae | 100 | return (rinfo->type == ZEBRA_ROUTE_RIP |
101 | && rinfo->sub_type == RIP_ROUTE_RTE); | |
718e3744 | 102 | } |
103 | ||
d62a17ae | 104 | static struct rip_info *rip_info_new(void) |
718e3744 | 105 | { |
d62a17ae | 106 | return XCALLOC(MTYPE_RIP_INFO, sizeof(struct rip_info)); |
718e3744 | 107 | } |
108 | ||
d62a17ae | 109 | void rip_info_free(struct rip_info *rinfo) |
718e3744 | 110 | { |
d62a17ae | 111 | XFREE(MTYPE_RIP_INFO, rinfo); |
718e3744 | 112 | } |
113 | ||
114 | /* RIP route garbage collect timer. */ | |
d62a17ae | 115 | static int rip_garbage_collect(struct thread *t) |
718e3744 | 116 | { |
d62a17ae | 117 | struct rip_info *rinfo; |
118 | struct route_node *rp; | |
119 | ||
120 | rinfo = THREAD_ARG(t); | |
121 | rinfo->t_garbage_collect = NULL; | |
718e3744 | 122 | |
d62a17ae | 123 | /* Off timeout timer. */ |
124 | RIP_TIMER_OFF(rinfo->t_timeout); | |
718e3744 | 125 | |
d62a17ae | 126 | /* Get route_node pointer. */ |
127 | rp = rinfo->rp; | |
718e3744 | 128 | |
d62a17ae | 129 | /* Unlock route_node. */ |
130 | listnode_delete(rp->info, rinfo); | |
131 | if (list_isempty((struct list *)rp->info)) { | |
acdf5e25 | 132 | list_delete_and_null((struct list **)&rp->info); |
d62a17ae | 133 | route_unlock_node(rp); |
134 | } | |
718e3744 | 135 | |
d62a17ae | 136 | /* Free RIP routing information. */ |
137 | rip_info_free(rinfo); | |
718e3744 | 138 | |
d62a17ae | 139 | return 0; |
718e3744 | 140 | } |
141 | ||
d62a17ae | 142 | static void rip_timeout_update(struct rip_info *rinfo); |
bce8e868 LF |
143 | |
144 | /* Add new route to the ECMP list. | |
8478ae7e LF |
145 | * RETURN: the new entry added in the list, or NULL if it is not the first |
146 | * entry and ECMP is not allowed. | |
bce8e868 | 147 | */ |
d62a17ae | 148 | struct rip_info *rip_ecmp_add(struct rip_info *rinfo_new) |
718e3744 | 149 | { |
d62a17ae | 150 | struct route_node *rp = rinfo_new->rp; |
151 | struct rip_info *rinfo = NULL; | |
152 | struct list *list = NULL; | |
718e3744 | 153 | |
d62a17ae | 154 | if (rp->info == NULL) |
155 | rp->info = list_new(); | |
156 | list = (struct list *)rp->info; | |
bce8e868 | 157 | |
d62a17ae | 158 | /* If ECMP is not allowed and some entry already exists in the list, |
159 | * do nothing. */ | |
160 | if (listcount(list) && !rip->ecmp) | |
161 | return NULL; | |
8478ae7e | 162 | |
d62a17ae | 163 | rinfo = rip_info_new(); |
164 | memcpy(rinfo, rinfo_new, sizeof(struct rip_info)); | |
165 | listnode_add(list, rinfo); | |
bce8e868 | 166 | |
d62a17ae | 167 | if (rip_route_rte(rinfo)) { |
168 | rip_timeout_update(rinfo); | |
169 | rip_zebra_ipv4_add(rp); | |
170 | } | |
bce8e868 | 171 | |
d62a17ae | 172 | /* Set the route change flag on the first entry. */ |
173 | rinfo = listgetdata(listhead(list)); | |
174 | SET_FLAG(rinfo->flags, RIP_RTF_CHANGED); | |
bce8e868 | 175 | |
d62a17ae | 176 | /* Signal the output process to trigger an update (see section 2.5). */ |
177 | rip_event(RIP_TRIGGERED_UPDATE, 0); | |
718e3744 | 178 | |
d62a17ae | 179 | return rinfo; |
bce8e868 LF |
180 | } |
181 | ||
182 | /* Replace the ECMP list with the new route. | |
183 | * RETURN: the new entry added in the list | |
184 | */ | |
d62a17ae | 185 | struct rip_info *rip_ecmp_replace(struct rip_info *rinfo_new) |
186 | { | |
187 | struct route_node *rp = rinfo_new->rp; | |
188 | struct list *list = (struct list *)rp->info; | |
189 | struct rip_info *rinfo = NULL, *tmp_rinfo = NULL; | |
190 | struct listnode *node = NULL, *nextnode = NULL; | |
191 | ||
192 | if (list == NULL || listcount(list) == 0) | |
193 | return rip_ecmp_add(rinfo_new); | |
194 | ||
195 | /* Get the first entry */ | |
196 | rinfo = listgetdata(listhead(list)); | |
197 | ||
198 | /* Learnt route replaced by a local one. Delete it from zebra. */ | |
199 | if (rip_route_rte(rinfo) && !rip_route_rte(rinfo_new)) | |
200 | if (CHECK_FLAG(rinfo->flags, RIP_RTF_FIB)) | |
201 | rip_zebra_ipv4_delete(rp); | |
202 | ||
203 | /* Re-use the first entry, and delete the others. */ | |
204 | for (ALL_LIST_ELEMENTS(list, node, nextnode, tmp_rinfo)) | |
205 | if (tmp_rinfo != rinfo) { | |
206 | RIP_TIMER_OFF(tmp_rinfo->t_timeout); | |
207 | RIP_TIMER_OFF(tmp_rinfo->t_garbage_collect); | |
208 | list_delete_node(list, node); | |
209 | rip_info_free(tmp_rinfo); | |
210 | } | |
718e3744 | 211 | |
d62a17ae | 212 | RIP_TIMER_OFF(rinfo->t_timeout); |
213 | RIP_TIMER_OFF(rinfo->t_garbage_collect); | |
214 | memcpy(rinfo, rinfo_new, sizeof(struct rip_info)); | |
718e3744 | 215 | |
d62a17ae | 216 | if (rip_route_rte(rinfo)) { |
217 | rip_timeout_update(rinfo); | |
218 | /* The ADD message implies an update. */ | |
219 | rip_zebra_ipv4_add(rp); | |
220 | } | |
718e3744 | 221 | |
d62a17ae | 222 | /* Set the route change flag. */ |
223 | SET_FLAG(rinfo->flags, RIP_RTF_CHANGED); | |
718e3744 | 224 | |
d62a17ae | 225 | /* Signal the output process to trigger an update (see section 2.5). */ |
226 | rip_event(RIP_TRIGGERED_UPDATE, 0); | |
718e3744 | 227 | |
d62a17ae | 228 | return rinfo; |
bce8e868 LF |
229 | } |
230 | ||
231 | /* Delete one route from the ECMP list. | |
232 | * RETURN: | |
233 | * null - the entry is freed, and other entries exist in the list | |
234 | * the entry - the entry is the last one in the list; its metric is set | |
235 | * to INFINITY, and the garbage collector is started for it | |
236 | */ | |
d62a17ae | 237 | struct rip_info *rip_ecmp_delete(struct rip_info *rinfo) |
238 | { | |
239 | struct route_node *rp = rinfo->rp; | |
240 | struct list *list = (struct list *)rp->info; | |
241 | ||
242 | RIP_TIMER_OFF(rinfo->t_timeout); | |
243 | ||
244 | if (listcount(list) > 1) { | |
245 | /* Some other ECMP entries still exist. Just delete this entry. | |
246 | */ | |
247 | RIP_TIMER_OFF(rinfo->t_garbage_collect); | |
248 | listnode_delete(list, rinfo); | |
249 | if (rip_route_rte(rinfo) | |
250 | && CHECK_FLAG(rinfo->flags, RIP_RTF_FIB)) | |
251 | /* The ADD message implies the update. */ | |
252 | rip_zebra_ipv4_add(rp); | |
253 | rip_info_free(rinfo); | |
254 | rinfo = NULL; | |
255 | } else { | |
256 | assert(rinfo == listgetdata(listhead(list))); | |
257 | ||
258 | /* This is the only entry left in the list. We must keep it in | |
259 | * the list for garbage collection time, with INFINITY metric. | |
260 | */ | |
261 | ||
262 | rinfo->metric = RIP_METRIC_INFINITY; | |
263 | RIP_TIMER_ON(rinfo->t_garbage_collect, rip_garbage_collect, | |
264 | rip->garbage_time); | |
265 | ||
266 | if (rip_route_rte(rinfo) | |
267 | && CHECK_FLAG(rinfo->flags, RIP_RTF_FIB)) | |
268 | rip_zebra_ipv4_delete(rp); | |
269 | } | |
bce8e868 | 270 | |
d62a17ae | 271 | /* Set the route change flag on the first entry. */ |
272 | rinfo = listgetdata(listhead(list)); | |
273 | SET_FLAG(rinfo->flags, RIP_RTF_CHANGED); | |
bce8e868 | 274 | |
d62a17ae | 275 | /* Signal the output process to trigger an update (see section 2.5). */ |
276 | rip_event(RIP_TRIGGERED_UPDATE, 0); | |
bce8e868 | 277 | |
d62a17ae | 278 | return rinfo; |
bce8e868 LF |
279 | } |
280 | ||
281 | /* Timeout RIP routes. */ | |
d62a17ae | 282 | static int rip_timeout(struct thread *t) |
bce8e868 | 283 | { |
d62a17ae | 284 | rip_ecmp_delete((struct rip_info *)THREAD_ARG(t)); |
285 | return 0; | |
718e3744 | 286 | } |
287 | ||
d62a17ae | 288 | static void rip_timeout_update(struct rip_info *rinfo) |
718e3744 | 289 | { |
d62a17ae | 290 | if (rinfo->metric != RIP_METRIC_INFINITY) { |
291 | RIP_TIMER_OFF(rinfo->t_timeout); | |
292 | RIP_TIMER_ON(rinfo->t_timeout, rip_timeout, rip->timeout_time); | |
293 | } | |
294 | } | |
295 | ||
296 | static int rip_filter(int rip_distribute, struct prefix_ipv4 *p, | |
297 | struct rip_interface *ri) | |
298 | { | |
299 | struct distribute *dist; | |
300 | struct access_list *alist; | |
301 | struct prefix_list *plist; | |
302 | int distribute = rip_distribute == RIP_FILTER_OUT ? DISTRIBUTE_V4_OUT | |
303 | : DISTRIBUTE_V4_IN; | |
304 | const char *inout = rip_distribute == RIP_FILTER_OUT ? "out" : "in"; | |
305 | ||
306 | /* Input distribute-list filtering. */ | |
307 | if (ri->list[rip_distribute]) { | |
308 | if (access_list_apply(ri->list[rip_distribute], | |
309 | (struct prefix *)p) | |
310 | == FILTER_DENY) { | |
311 | if (IS_RIP_DEBUG_PACKET) | |
312 | zlog_debug("%s/%d filtered by distribute %s", | |
313 | inet_ntoa(p->prefix), p->prefixlen, | |
314 | inout); | |
315 | return -1; | |
718e3744 | 316 | } |
718e3744 | 317 | } |
d62a17ae | 318 | if (ri->prefix[rip_distribute]) { |
319 | if (prefix_list_apply(ri->prefix[rip_distribute], | |
320 | (struct prefix *)p) | |
321 | == PREFIX_DENY) { | |
322 | if (IS_RIP_DEBUG_PACKET) | |
323 | zlog_debug("%s/%d filtered by prefix-list %s", | |
324 | inet_ntoa(p->prefix), p->prefixlen, | |
325 | inout); | |
326 | return -1; | |
718e3744 | 327 | } |
718e3744 | 328 | } |
d62a17ae | 329 | |
330 | /* All interface filter check. */ | |
331 | dist = distribute_lookup(NULL); | |
332 | if (dist) { | |
333 | if (dist->list[distribute]) { | |
334 | alist = access_list_lookup(AFI_IP, | |
335 | dist->list[distribute]); | |
336 | ||
337 | if (alist) { | |
338 | if (access_list_apply(alist, (struct prefix *)p) | |
339 | == FILTER_DENY) { | |
340 | if (IS_RIP_DEBUG_PACKET) | |
341 | zlog_debug( | |
342 | "%s/%d filtered by distribute %s", | |
343 | inet_ntoa(p->prefix), | |
344 | p->prefixlen, inout); | |
345 | return -1; | |
346 | } | |
347 | } | |
348 | } | |
349 | if (dist->prefix[distribute]) { | |
350 | plist = prefix_list_lookup(AFI_IP, | |
351 | dist->prefix[distribute]); | |
352 | ||
353 | if (plist) { | |
354 | if (prefix_list_apply(plist, (struct prefix *)p) | |
355 | == PREFIX_DENY) { | |
356 | if (IS_RIP_DEBUG_PACKET) | |
357 | zlog_debug( | |
358 | "%s/%d filtered by prefix-list %s", | |
359 | inet_ntoa(p->prefix), | |
360 | p->prefixlen, inout); | |
361 | return -1; | |
362 | } | |
363 | } | |
364 | } | |
365 | } | |
366 | return 0; | |
718e3744 | 367 | } |
368 | ||
369 | /* Check nexthop address validity. */ | |
d62a17ae | 370 | static int rip_nexthop_check(struct in_addr *addr) |
718e3744 | 371 | { |
f4e14fdb | 372 | struct vrf *vrf = vrf_lookup_by_id(VRF_DEFAULT); |
d62a17ae | 373 | struct interface *ifp; |
f4e14fdb | 374 | struct listnode *cnode; |
d62a17ae | 375 | struct connected *ifc; |
376 | struct prefix *p; | |
718e3744 | 377 | |
d62a17ae | 378 | /* If nexthop address matches local configured address then it is |
379 | invalid nexthop. */ | |
b2d7c082 | 380 | |
451fda4f | 381 | FOR_ALL_INTERFACES (vrf, ifp) { |
d62a17ae | 382 | for (ALL_LIST_ELEMENTS_RO(ifp->connected, cnode, ifc)) { |
383 | p = ifc->address; | |
718e3744 | 384 | |
d62a17ae | 385 | if (p->family == AF_INET |
386 | && IPV4_ADDR_SAME(&p->u.prefix4, addr)) | |
387 | return -1; | |
388 | } | |
718e3744 | 389 | } |
d62a17ae | 390 | return 0; |
718e3744 | 391 | } |
392 | ||
393 | /* RIP add route to routing table. */ | |
d62a17ae | 394 | static void rip_rte_process(struct rte *rte, struct sockaddr_in *from, |
395 | struct interface *ifp) | |
396 | { | |
397 | int ret; | |
398 | struct prefix_ipv4 p; | |
399 | struct route_node *rp; | |
400 | struct rip_info *rinfo = NULL, newinfo; | |
401 | struct rip_interface *ri; | |
402 | struct in_addr *nexthop; | |
403 | int same = 0; | |
404 | unsigned char old_dist, new_dist; | |
405 | struct list *list = NULL; | |
406 | struct listnode *node = NULL; | |
407 | ||
408 | /* Make prefix structure. */ | |
409 | memset(&p, 0, sizeof(struct prefix_ipv4)); | |
410 | p.family = AF_INET; | |
411 | p.prefix = rte->prefix; | |
412 | p.prefixlen = ip_masklen(rte->mask); | |
413 | ||
414 | /* Make sure mask is applied. */ | |
415 | apply_mask_ipv4(&p); | |
416 | ||
417 | /* Apply input filters. */ | |
418 | ri = ifp->info; | |
718e3744 | 419 | |
d62a17ae | 420 | ret = rip_filter(RIP_FILTER_IN, &p, ri); |
421 | if (ret < 0) | |
422 | return; | |
423 | ||
424 | memset(&newinfo, 0, sizeof(newinfo)); | |
425 | newinfo.type = ZEBRA_ROUTE_RIP; | |
426 | newinfo.sub_type = RIP_ROUTE_RTE; | |
dd127197 | 427 | newinfo.nh.gate.ipv4 = rte->nexthop; |
d62a17ae | 428 | newinfo.from = from->sin_addr; |
dd127197 DS |
429 | newinfo.nh.ifindex = ifp->ifindex; |
430 | newinfo.nh.type = NEXTHOP_TYPE_IPV4_IFINDEX; | |
d62a17ae | 431 | newinfo.metric = rte->metric; |
432 | newinfo.metric_out = rte->metric; /* XXX */ | |
433 | newinfo.tag = ntohs(rte->tag); /* XXX */ | |
434 | ||
435 | /* Modify entry according to the interface routemap. */ | |
436 | if (ri->routemap[RIP_FILTER_IN]) { | |
437 | int ret; | |
438 | ||
439 | /* The object should be of the type of rip_info */ | |
440 | ret = route_map_apply(ri->routemap[RIP_FILTER_IN], | |
441 | (struct prefix *)&p, RMAP_RIP, &newinfo); | |
442 | ||
443 | if (ret == RMAP_DENYMATCH) { | |
444 | if (IS_RIP_DEBUG_PACKET) | |
445 | zlog_debug( | |
446 | "RIP %s/%d is filtered by route-map in", | |
447 | inet_ntoa(p.prefix), p.prefixlen); | |
448 | return; | |
449 | } | |
450 | ||
451 | /* Get back the object */ | |
452 | rte->nexthop = newinfo.nexthop_out; | |
453 | rte->tag = htons(newinfo.tag_out); /* XXX */ | |
9d303b37 DL |
454 | rte->metric = |
455 | newinfo.metric_out; /* XXX: the routemap uses the | |
456 | metric_out field */ | |
d62a17ae | 457 | } |
458 | ||
459 | /* Once the entry has been validated, update the metric by | |
460 | adding the cost of the network on wich the message | |
461 | arrived. If the result is greater than infinity, use infinity | |
462 | (RFC2453 Sec. 3.9.2) */ | |
463 | /* Zebra ripd can handle offset-list in. */ | |
464 | ret = rip_offset_list_apply_in(&p, ifp, &rte->metric); | |
718e3744 | 465 | |
d62a17ae | 466 | /* If offset-list does not modify the metric use interface's |
467 | metric. */ | |
468 | if (!ret) | |
469 | rte->metric += ifp->metric ? ifp->metric : 1; | |
718e3744 | 470 | |
d62a17ae | 471 | if (rte->metric > RIP_METRIC_INFINITY) |
472 | rte->metric = RIP_METRIC_INFINITY; | |
473 | ||
474 | /* Set nexthop pointer. */ | |
475 | if (rte->nexthop.s_addr == 0) | |
476 | nexthop = &from->sin_addr; | |
477 | else | |
478 | nexthop = &rte->nexthop; | |
479 | ||
480 | /* Check if nexthop address is myself, then do nothing. */ | |
481 | if (rip_nexthop_check(nexthop) < 0) { | |
482 | if (IS_RIP_DEBUG_PACKET) | |
483 | zlog_debug("Nexthop address %s is myself", | |
484 | inet_ntoa(*nexthop)); | |
485 | return; | |
486 | } | |
487 | ||
488 | /* Get index for the prefix. */ | |
489 | rp = route_node_get(rip->table, (struct prefix *)&p); | |
490 | ||
491 | newinfo.rp = rp; | |
dd127197 DS |
492 | newinfo.nh.gate.ipv4 = *nexthop; |
493 | newinfo.nh.type = NEXTHOP_TYPE_IPV4; | |
d62a17ae | 494 | newinfo.metric = rte->metric; |
495 | newinfo.tag = ntohs(rte->tag); | |
496 | newinfo.distance = rip_distance_apply(&newinfo); | |
497 | ||
498 | new_dist = newinfo.distance ? newinfo.distance | |
499 | : ZEBRA_RIP_DISTANCE_DEFAULT; | |
500 | ||
501 | /* Check to see whether there is already RIP route on the table. */ | |
502 | if ((list = rp->info) != NULL) | |
503 | for (ALL_LIST_ELEMENTS_RO(list, node, rinfo)) { | |
504 | /* Need to compare with redistributed entry or local | |
505 | * entry */ | |
506 | if (!rip_route_rte(rinfo)) | |
507 | break; | |
508 | ||
509 | if (IPV4_ADDR_SAME(&rinfo->from, &from->sin_addr) | |
dd127197 | 510 | && IPV4_ADDR_SAME(&rinfo->nh.gate.ipv4, nexthop)) |
d62a17ae | 511 | break; |
512 | ||
513 | if (!listnextnode(node)) { | |
514 | /* Not found in the list */ | |
515 | ||
516 | if (rte->metric > rinfo->metric) { | |
517 | /* New route has a greater metric. | |
518 | * Discard it. */ | |
519 | route_unlock_node(rp); | |
520 | return; | |
521 | } | |
522 | ||
523 | if (rte->metric < rinfo->metric) | |
524 | /* New route has a smaller metric. | |
525 | * Replace the ECMP list | |
526 | * with the new one in below. */ | |
527 | break; | |
528 | ||
529 | /* Metrics are same. We compare the distances. | |
530 | */ | |
531 | old_dist = rinfo->distance | |
532 | ? rinfo->distance | |
533 | : ZEBRA_RIP_DISTANCE_DEFAULT; | |
534 | ||
535 | if (new_dist > old_dist) { | |
536 | /* New route has a greater distance. | |
537 | * Discard it. */ | |
538 | route_unlock_node(rp); | |
539 | return; | |
540 | } | |
541 | ||
542 | if (new_dist < old_dist) | |
543 | /* New route has a smaller distance. | |
544 | * Replace the ECMP list | |
545 | * with the new one in below. */ | |
546 | break; | |
547 | ||
548 | /* Metrics and distances are both same. Keep | |
549 | * "rinfo" null and | |
550 | * the new route is added in the ECMP list in | |
551 | * below. */ | |
552 | } | |
718e3744 | 553 | } |
d62a17ae | 554 | |
555 | if (rinfo) { | |
556 | /* Local static route. */ | |
557 | if (rinfo->type == ZEBRA_ROUTE_RIP | |
558 | && ((rinfo->sub_type == RIP_ROUTE_STATIC) | |
559 | || (rinfo->sub_type == RIP_ROUTE_DEFAULT)) | |
560 | && rinfo->metric != RIP_METRIC_INFINITY) { | |
561 | route_unlock_node(rp); | |
562 | return; | |
718e3744 | 563 | } |
d62a17ae | 564 | |
565 | /* Redistributed route check. */ | |
566 | if (rinfo->type != ZEBRA_ROUTE_RIP | |
567 | && rinfo->metric != RIP_METRIC_INFINITY) { | |
568 | old_dist = rinfo->distance; | |
569 | /* Only routes directly connected to an interface | |
570 | * (nexthop == 0) | |
571 | * may have a valid NULL distance */ | |
dd127197 | 572 | if (rinfo->nh.gate.ipv4.s_addr != 0) |
d62a17ae | 573 | old_dist = old_dist |
574 | ? old_dist | |
575 | : ZEBRA_RIP_DISTANCE_DEFAULT; | |
576 | /* If imported route does not have STRICT precedence, | |
577 | mark it as a ghost */ | |
578 | if (new_dist <= old_dist | |
579 | && rte->metric != RIP_METRIC_INFINITY) | |
580 | rip_ecmp_replace(&newinfo); | |
581 | ||
582 | route_unlock_node(rp); | |
583 | return; | |
718e3744 | 584 | } |
d62a17ae | 585 | } |
586 | ||
587 | if (!rinfo) { | |
588 | if (rp->info) | |
589 | route_unlock_node(rp); | |
590 | ||
591 | /* Now, check to see whether there is already an explicit route | |
592 | for the destination prefix. If there is no such route, add | |
593 | this route to the routing table, unless the metric is | |
594 | infinity (there is no point in adding a route which | |
595 | unusable). */ | |
596 | if (rte->metric != RIP_METRIC_INFINITY) | |
597 | rip_ecmp_add(&newinfo); | |
598 | } else { | |
599 | /* Route is there but we are not sure the route is RIP or not. | |
600 | */ | |
601 | ||
602 | /* If there is an existing route, compare the next hop address | |
603 | to the address of the router from which the datagram came. | |
604 | If this datagram is from the same router as the existing | |
605 | route, reinitialize the timeout. */ | |
606 | same = (IPV4_ADDR_SAME(&rinfo->from, &from->sin_addr) | |
dd127197 | 607 | && (rinfo->nh.ifindex == ifp->ifindex)); |
d62a17ae | 608 | |
609 | old_dist = rinfo->distance ? rinfo->distance | |
610 | : ZEBRA_RIP_DISTANCE_DEFAULT; | |
611 | ||
612 | /* Next, compare the metrics. If the datagram is from the same | |
613 | router as the existing route, and the new metric is different | |
614 | than the old one; or, if the new metric is lower than the old | |
615 | one, or if the tag has been changed; or if there is a route | |
616 | with a lower administrave distance; or an update of the | |
617 | distance on the actual route; do the following actions: */ | |
618 | if ((same && rinfo->metric != rte->metric) | |
619 | || (rte->metric < rinfo->metric) | |
620 | || ((same) && (rinfo->metric == rte->metric) | |
621 | && (newinfo.tag != rinfo->tag)) | |
622 | || (old_dist > new_dist) | |
623 | || ((old_dist != new_dist) && same)) { | |
624 | if (listcount(list) == 1) { | |
625 | if (newinfo.metric != RIP_METRIC_INFINITY) | |
626 | rip_ecmp_replace(&newinfo); | |
627 | else | |
628 | rip_ecmp_delete(rinfo); | |
629 | } else { | |
630 | if (newinfo.metric < rinfo->metric) | |
631 | rip_ecmp_replace(&newinfo); | |
632 | else if (newinfo.metric > rinfo->metric) | |
633 | rip_ecmp_delete(rinfo); | |
634 | else if (new_dist < old_dist) | |
635 | rip_ecmp_replace(&newinfo); | |
636 | else if (new_dist > old_dist) | |
637 | rip_ecmp_delete(rinfo); | |
638 | else { | |
639 | int update = CHECK_FLAG(rinfo->flags, | |
640 | RIP_RTF_FIB) | |
641 | ? 1 | |
642 | : 0; | |
643 | ||
644 | assert(newinfo.metric | |
645 | != RIP_METRIC_INFINITY); | |
646 | ||
647 | RIP_TIMER_OFF(rinfo->t_timeout); | |
648 | RIP_TIMER_OFF(rinfo->t_garbage_collect); | |
649 | memcpy(rinfo, &newinfo, | |
650 | sizeof(struct rip_info)); | |
651 | rip_timeout_update(rinfo); | |
652 | ||
653 | if (update) | |
654 | rip_zebra_ipv4_add(rp); | |
655 | ||
656 | /* - Set the route change flag on the | |
657 | * first entry. */ | |
658 | rinfo = listgetdata(listhead(list)); | |
659 | SET_FLAG(rinfo->flags, RIP_RTF_CHANGED); | |
660 | rip_event(RIP_TRIGGERED_UPDATE, 0); | |
661 | } | |
662 | } | |
663 | } else /* same & no change */ | |
664 | rip_timeout_update(rinfo); | |
665 | ||
666 | /* Unlock tempolary lock of the route. */ | |
667 | route_unlock_node(rp); | |
668 | } | |
669 | } | |
670 | ||
671 | /* Dump RIP packet */ | |
672 | static void rip_packet_dump(struct rip_packet *packet, int size, | |
673 | const char *sndrcv) | |
674 | { | |
675 | caddr_t lim; | |
676 | struct rte *rte; | |
677 | const char *command_str; | |
678 | char pbuf[BUFSIZ], nbuf[BUFSIZ]; | |
679 | u_char netmask = 0; | |
680 | u_char *p; | |
681 | ||
682 | /* Set command string. */ | |
683 | if (packet->command > 0 && packet->command < RIP_COMMAND_MAX) | |
684 | command_str = lookup_msg(rip_msg, packet->command, NULL); | |
685 | else | |
686 | command_str = "unknown"; | |
687 | ||
688 | /* Dump packet header. */ | |
689 | zlog_debug("%s %s version %d packet size %d", sndrcv, command_str, | |
690 | packet->version, size); | |
691 | ||
692 | /* Dump each routing table entry. */ | |
693 | rte = packet->rte; | |
694 | ||
695 | for (lim = (caddr_t)packet + size; (caddr_t)rte < lim; rte++) { | |
696 | if (packet->version == RIPv2) { | |
697 | netmask = ip_masklen(rte->mask); | |
698 | ||
699 | if (rte->family == htons(RIP_FAMILY_AUTH)) { | |
700 | if (rte->tag | |
701 | == htons(RIP_AUTH_SIMPLE_PASSWORD)) { | |
702 | p = (u_char *)&rte->prefix; | |
703 | ||
704 | zlog_debug( | |
705 | " family 0x%X type %d auth string: %s", | |
706 | ntohs(rte->family), | |
707 | ntohs(rte->tag), p); | |
708 | } else if (rte->tag == htons(RIP_AUTH_MD5)) { | |
709 | struct rip_md5_info *md5; | |
710 | ||
711 | md5 = (struct rip_md5_info *)&packet | |
712 | ->rte; | |
713 | ||
714 | zlog_debug( | |
715 | " family 0x%X type %d (MD5 authentication)", | |
716 | ntohs(md5->family), | |
717 | ntohs(md5->type)); | |
718 | zlog_debug( | |
719 | " RIP-2 packet len %d Key ID %d" | |
720 | " Auth Data len %d", | |
721 | ntohs(md5->packet_len), | |
722 | md5->keyid, md5->auth_len); | |
723 | zlog_debug( | |
724 | " Sequence Number %ld", | |
725 | (u_long)ntohl(md5->sequence)); | |
726 | } else if (rte->tag == htons(RIP_AUTH_DATA)) { | |
727 | p = (u_char *)&rte->prefix; | |
728 | ||
729 | zlog_debug( | |
730 | " family 0x%X type %d (MD5 data)", | |
731 | ntohs(rte->family), | |
732 | ntohs(rte->tag)); | |
733 | zlog_debug( | |
734 | " MD5: %02X%02X%02X%02X%02X%02X%02X%02X" | |
735 | "%02X%02X%02X%02X%02X%02X%02X%02X", | |
736 | p[0], p[1], p[2], p[3], p[4], | |
737 | p[5], p[6], p[7], p[8], p[9], | |
738 | p[10], p[11], p[12], p[13], | |
739 | p[14], p[15]); | |
740 | } else { | |
741 | zlog_debug( | |
742 | " family 0x%X type %d (Unknown auth type)", | |
743 | ntohs(rte->family), | |
744 | ntohs(rte->tag)); | |
745 | } | |
746 | } else | |
747 | zlog_debug( | |
748 | " %s/%d -> %s family %d tag %" ROUTE_TAG_PRI | |
749 | " metric %ld", | |
750 | inet_ntop(AF_INET, &rte->prefix, pbuf, | |
751 | BUFSIZ), | |
752 | netmask, | |
753 | inet_ntop(AF_INET, &rte->nexthop, nbuf, | |
754 | BUFSIZ), | |
755 | ntohs(rte->family), | |
756 | (route_tag_t)ntohs(rte->tag), | |
757 | (u_long)ntohl(rte->metric)); | |
758 | } else { | |
759 | zlog_debug( | |
760 | " %s family %d tag %" ROUTE_TAG_PRI | |
761 | " metric %ld", | |
762 | inet_ntop(AF_INET, &rte->prefix, pbuf, BUFSIZ), | |
763 | ntohs(rte->family), | |
764 | (route_tag_t)ntohs(rte->tag), | |
765 | (u_long)ntohl(rte->metric)); | |
718e3744 | 766 | } |
718e3744 | 767 | } |
718e3744 | 768 | } |
769 | ||
770 | /* Check if the destination address is valid (unicast; not net 0 | |
771 | or 127) (RFC2453 Section 3.9.2 - Page 26). But we don't | |
772 | check net 0 because we accept default route. */ | |
d62a17ae | 773 | static int rip_destination_check(struct in_addr addr) |
718e3744 | 774 | { |
d62a17ae | 775 | u_int32_t destination; |
718e3744 | 776 | |
d62a17ae | 777 | /* Convert to host byte order. */ |
778 | destination = ntohl(addr.s_addr); | |
718e3744 | 779 | |
d62a17ae | 780 | if (IPV4_NET127(destination)) |
781 | return 0; | |
718e3744 | 782 | |
d62a17ae | 783 | /* Net 0 may match to the default route. */ |
784 | if (IPV4_NET0(destination) && destination != 0) | |
785 | return 0; | |
718e3744 | 786 | |
d62a17ae | 787 | /* Unicast address must belong to class A, B, C. */ |
788 | if (IN_CLASSA(destination)) | |
789 | return 1; | |
790 | if (IN_CLASSB(destination)) | |
791 | return 1; | |
792 | if (IN_CLASSC(destination)) | |
793 | return 1; | |
718e3744 | 794 | |
d62a17ae | 795 | return 0; |
718e3744 | 796 | } |
797 | ||
798 | /* RIP version 2 authentication. */ | |
d62a17ae | 799 | static int rip_auth_simple_password(struct rte *rte, struct sockaddr_in *from, |
800 | struct interface *ifp) | |
801 | { | |
802 | struct rip_interface *ri; | |
803 | char *auth_str = (char *)&rte->prefix; | |
804 | int i; | |
805 | ||
806 | /* reject passwords with zeros in the middle of the string */ | |
807 | for (i = strlen(auth_str); i < 16; i++) { | |
808 | if (auth_str[i] != '\0') | |
809 | return 0; | |
810 | } | |
811 | ||
812 | if (IS_RIP_DEBUG_EVENT) | |
813 | zlog_debug("RIPv2 simple password authentication from %s", | |
814 | inet_ntoa(from->sin_addr)); | |
815 | ||
816 | ri = ifp->info; | |
817 | ||
818 | if (ri->auth_type != RIP_AUTH_SIMPLE_PASSWORD | |
819 | || rte->tag != htons(RIP_AUTH_SIMPLE_PASSWORD)) | |
820 | return 0; | |
718e3744 | 821 | |
d62a17ae | 822 | /* Simple password authentication. */ |
823 | if (ri->auth_str) { | |
824 | if (strncmp(auth_str, ri->auth_str, 16) == 0) | |
825 | return 1; | |
826 | } | |
827 | if (ri->key_chain) { | |
828 | struct keychain *keychain; | |
829 | struct key *key; | |
830 | ||
831 | keychain = keychain_lookup(ri->key_chain); | |
832 | if (keychain == NULL) | |
833 | return 0; | |
834 | ||
835 | key = key_match_for_accept(keychain, auth_str); | |
836 | if (key) | |
837 | return 1; | |
838 | } | |
839 | return 0; | |
718e3744 | 840 | } |
841 | ||
842 | /* RIP version 2 authentication with MD5. */ | |
d62a17ae | 843 | static int rip_auth_md5(struct rip_packet *packet, struct sockaddr_in *from, |
844 | int length, struct interface *ifp) | |
845 | { | |
846 | struct rip_interface *ri; | |
847 | struct rip_md5_info *md5; | |
848 | struct rip_md5_data *md5data; | |
849 | struct keychain *keychain; | |
850 | struct key *key; | |
851 | MD5_CTX ctx; | |
852 | u_char digest[RIP_AUTH_MD5_SIZE]; | |
853 | u_int16_t packet_len; | |
854 | char auth_str[RIP_AUTH_MD5_SIZE]; | |
855 | ||
856 | if (IS_RIP_DEBUG_EVENT) | |
857 | zlog_debug("RIPv2 MD5 authentication from %s", | |
858 | inet_ntoa(from->sin_addr)); | |
718e3744 | 859 | |
d62a17ae | 860 | ri = ifp->info; |
861 | md5 = (struct rip_md5_info *)&packet->rte; | |
862 | ||
863 | /* Check auth type. */ | |
864 | if (ri->auth_type != RIP_AUTH_MD5 || md5->type != htons(RIP_AUTH_MD5)) | |
865 | return 0; | |
866 | ||
867 | /* If the authentication length is less than 16, then it must be wrong | |
868 | * for | |
869 | * any interpretation of rfc2082. Some implementations also interpret | |
870 | * this as RIP_HEADER_SIZE+ RIP_AUTH_MD5_SIZE, aka | |
871 | * RIP_AUTH_MD5_COMPAT_SIZE. | |
872 | */ | |
873 | if (!((md5->auth_len == RIP_AUTH_MD5_SIZE) | |
874 | || (md5->auth_len == RIP_AUTH_MD5_COMPAT_SIZE))) { | |
875 | if (IS_RIP_DEBUG_EVENT) | |
876 | zlog_debug( | |
877 | "RIPv2 MD5 authentication, strange authentication " | |
878 | "length field %d", | |
879 | md5->auth_len); | |
880 | return 0; | |
881 | } | |
882 | ||
883 | /* grab and verify check packet length */ | |
884 | packet_len = ntohs(md5->packet_len); | |
718e3744 | 885 | |
d62a17ae | 886 | if (packet_len > (length - RIP_HEADER_SIZE - RIP_AUTH_MD5_SIZE)) { |
887 | if (IS_RIP_DEBUG_EVENT) | |
888 | zlog_debug( | |
889 | "RIPv2 MD5 authentication, packet length field %d " | |
890 | "greater than received length %d!", | |
891 | md5->packet_len, length); | |
892 | return 0; | |
893 | } | |
894 | ||
895 | /* retrieve authentication data */ | |
896 | md5data = (struct rip_md5_data *)(((u_char *)packet) + packet_len); | |
897 | ||
898 | memset(auth_str, 0, RIP_AUTH_MD5_SIZE); | |
899 | ||
900 | if (ri->key_chain) { | |
901 | keychain = keychain_lookup(ri->key_chain); | |
902 | if (keychain == NULL) | |
903 | return 0; | |
904 | ||
905 | key = key_lookup_for_accept(keychain, md5->keyid); | |
906 | if (key == NULL) | |
907 | return 0; | |
908 | ||
909 | strncpy(auth_str, key->string, RIP_AUTH_MD5_SIZE); | |
910 | } else if (ri->auth_str) | |
911 | strncpy(auth_str, ri->auth_str, RIP_AUTH_MD5_SIZE); | |
912 | ||
913 | if (auth_str[0] == 0) | |
914 | return 0; | |
915 | ||
916 | /* MD5 digest authentication. */ | |
917 | memset(&ctx, 0, sizeof(ctx)); | |
918 | MD5Init(&ctx); | |
919 | MD5Update(&ctx, packet, packet_len + RIP_HEADER_SIZE); | |
920 | MD5Update(&ctx, auth_str, RIP_AUTH_MD5_SIZE); | |
921 | MD5Final(digest, &ctx); | |
922 | ||
923 | if (memcmp(md5data->digest, digest, RIP_AUTH_MD5_SIZE) == 0) | |
924 | return packet_len; | |
925 | else | |
926 | return 0; | |
718e3744 | 927 | } |
928 | ||
b14ee00b | 929 | /* Pick correct auth string for sends, prepare auth_str buffer for use. |
930 | * (left justified and padded). | |
931 | * | |
932 | * presumes one of ri or key is valid, and that the auth strings they point | |
933 | * to are nul terminated. If neither are present, auth_str will be fully | |
934 | * zero padded. | |
935 | * | |
936 | */ | |
d62a17ae | 937 | static void rip_auth_prepare_str_send(struct rip_interface *ri, struct key *key, |
938 | char *auth_str, int len) | |
718e3744 | 939 | { |
d62a17ae | 940 | assert(ri || key); |
718e3744 | 941 | |
d62a17ae | 942 | memset(auth_str, 0, len); |
943 | if (key && key->string) | |
944 | strncpy(auth_str, key->string, len); | |
945 | else if (ri->auth_str) | |
946 | strncpy(auth_str, ri->auth_str, len); | |
718e3744 | 947 | |
d62a17ae | 948 | return; |
b14ee00b | 949 | } |
718e3744 | 950 | |
b14ee00b | 951 | /* Write RIPv2 simple password authentication information |
952 | * | |
d62a17ae | 953 | * auth_str is presumed to be 2 bytes and correctly prepared |
b14ee00b | 954 | * (left justified and zero padded). |
955 | */ | |
d62a17ae | 956 | static void rip_auth_simple_write(struct stream *s, char *auth_str, int len) |
b14ee00b | 957 | { |
d62a17ae | 958 | assert(s && len == RIP_AUTH_SIMPLE_SIZE); |
959 | ||
960 | stream_putw(s, RIP_FAMILY_AUTH); | |
961 | stream_putw(s, RIP_AUTH_SIMPLE_PASSWORD); | |
962 | stream_put(s, auth_str, RIP_AUTH_SIMPLE_SIZE); | |
963 | ||
964 | return; | |
b14ee00b | 965 | } |
718e3744 | 966 | |
d62a17ae | 967 | /* write RIPv2 MD5 "authentication header" |
b14ee00b | 968 | * (uses the auth key data field) |
969 | * | |
970 | * Digest offset field is set to 0. | |
971 | * | |
972 | * returns: offset of the digest offset field, which must be set when | |
973 | * length to the auth-data MD5 digest is known. | |
974 | */ | |
d62a17ae | 975 | static size_t rip_auth_md5_ah_write(struct stream *s, struct rip_interface *ri, |
976 | struct key *key) | |
977 | { | |
978 | size_t doff = 0; | |
979 | ||
980 | assert(s && ri && ri->auth_type == RIP_AUTH_MD5); | |
981 | ||
982 | /* MD5 authentication. */ | |
983 | stream_putw(s, RIP_FAMILY_AUTH); | |
984 | stream_putw(s, RIP_AUTH_MD5); | |
985 | ||
986 | /* MD5 AH digest offset field. | |
987 | * | |
988 | * Set to placeholder value here, to true value when RIP-2 Packet length | |
989 | * is known. Actual value is set in .....(). | |
990 | */ | |
991 | doff = stream_get_endp(s); | |
992 | stream_putw(s, 0); | |
993 | ||
994 | /* Key ID. */ | |
995 | if (key) | |
996 | stream_putc(s, key->index % 256); | |
997 | else | |
998 | stream_putc(s, 1); | |
999 | ||
1000 | /* Auth Data Len. Set 16 for MD5 authentication data. Older ripds | |
1001 | * however expect RIP_HEADER_SIZE + RIP_AUTH_MD5_SIZE so we allow for | |
1002 | * this | |
1003 | * to be configurable. | |
1004 | */ | |
1005 | stream_putc(s, ri->md5_auth_len); | |
1006 | ||
1007 | /* Sequence Number (non-decreasing). */ | |
1008 | /* RFC2080: The value used in the sequence number is | |
1009 | arbitrary, but two suggestions are the time of the | |
1010 | message's creation or a simple message counter. */ | |
1011 | stream_putl(s, time(NULL)); | |
1012 | ||
1013 | /* Reserved field must be zero. */ | |
1014 | stream_putl(s, 0); | |
1015 | stream_putl(s, 0); | |
1016 | ||
1017 | return doff; | |
b14ee00b | 1018 | } |
1019 | ||
1020 | /* If authentication is in used, write the appropriate header | |
1021 | * returns stream offset to which length must later be written | |
1022 | * or 0 if this is not required | |
1023 | */ | |
d62a17ae | 1024 | static size_t rip_auth_header_write(struct stream *s, struct rip_interface *ri, |
1025 | struct key *key, char *auth_str, int len) | |
1026 | { | |
1027 | assert(ri->auth_type != RIP_NO_AUTH); | |
1028 | ||
1029 | switch (ri->auth_type) { | |
1030 | case RIP_AUTH_SIMPLE_PASSWORD: | |
1031 | rip_auth_prepare_str_send(ri, key, auth_str, len); | |
1032 | rip_auth_simple_write(s, auth_str, len); | |
1033 | return 0; | |
1034 | case RIP_AUTH_MD5: | |
1035 | return rip_auth_md5_ah_write(s, ri, key); | |
1036 | } | |
1037 | assert(1); | |
1038 | return 0; | |
b14ee00b | 1039 | } |
1040 | ||
1041 | /* Write RIPv2 MD5 authentication data trailer */ | |
d62a17ae | 1042 | static void rip_auth_md5_set(struct stream *s, struct rip_interface *ri, |
1043 | size_t doff, char *auth_str, int authlen) | |
1044 | { | |
1045 | unsigned long len; | |
1046 | MD5_CTX ctx; | |
1047 | unsigned char digest[RIP_AUTH_MD5_SIZE]; | |
1048 | ||
1049 | /* Make it sure this interface is configured as MD5 | |
1050 | authentication. */ | |
1051 | assert((ri->auth_type == RIP_AUTH_MD5) | |
1052 | && (authlen == RIP_AUTH_MD5_SIZE)); | |
1053 | assert(doff > 0); | |
1054 | ||
1055 | /* Get packet length. */ | |
1056 | len = stream_get_endp(s); | |
1057 | ||
1058 | /* Check packet length. */ | |
1059 | if (len < (RIP_HEADER_SIZE + RIP_RTE_SIZE)) { | |
1060 | zlog_err( | |
1061 | "rip_auth_md5_set(): packet length %ld is less than minimum length.", | |
1062 | len); | |
1063 | return; | |
1064 | } | |
1065 | ||
1066 | /* Set the digest offset length in the header */ | |
1067 | stream_putw_at(s, doff, len); | |
1068 | ||
1069 | /* Set authentication data. */ | |
1070 | stream_putw(s, RIP_FAMILY_AUTH); | |
1071 | stream_putw(s, RIP_AUTH_DATA); | |
1072 | ||
1073 | /* Generate a digest for the RIP packet. */ | |
1074 | memset(&ctx, 0, sizeof(ctx)); | |
1075 | MD5Init(&ctx); | |
1076 | MD5Update(&ctx, STREAM_DATA(s), stream_get_endp(s)); | |
1077 | MD5Update(&ctx, auth_str, RIP_AUTH_MD5_SIZE); | |
1078 | MD5Final(digest, &ctx); | |
1079 | ||
1080 | /* Copy the digest to the packet. */ | |
1081 | stream_write(s, digest, RIP_AUTH_MD5_SIZE); | |
718e3744 | 1082 | } |
1083 | ||
1084 | /* RIP routing information. */ | |
d62a17ae | 1085 | static void rip_response_process(struct rip_packet *packet, int size, |
1086 | struct sockaddr_in *from, | |
1087 | struct connected *ifc) | |
1088 | { | |
1089 | caddr_t lim; | |
1090 | struct rte *rte; | |
1091 | struct prefix_ipv4 ifaddr; | |
1092 | struct prefix_ipv4 ifaddrclass; | |
1093 | int subnetted; | |
1094 | ||
1095 | memset(&ifaddr, 0, sizeof(ifaddr)); | |
1096 | /* We don't know yet. */ | |
1097 | subnetted = -1; | |
1098 | ||
1099 | /* The Response must be ignored if it is not from the RIP | |
1100 | port. (RFC2453 - Sec. 3.9.2)*/ | |
1101 | if (from->sin_port != htons(RIP_PORT_DEFAULT)) { | |
1102 | zlog_info("response doesn't come from RIP port: %d", | |
1103 | from->sin_port); | |
1104 | rip_peer_bad_packet(from); | |
1105 | return; | |
718e3744 | 1106 | } |
1107 | ||
d62a17ae | 1108 | /* The datagram's IPv4 source address should be checked to see |
1109 | whether the datagram is from a valid neighbor; the source of the | |
1110 | datagram must be on a directly connected network (RFC2453 - Sec. | |
1111 | 3.9.2) */ | |
1112 | if (if_lookup_address((void *)&from->sin_addr, AF_INET, VRF_DEFAULT) | |
1113 | == NULL) { | |
1114 | zlog_info( | |
1115 | "This datagram doesn't came from a valid neighbor: %s", | |
1116 | inet_ntoa(from->sin_addr)); | |
1117 | rip_peer_bad_packet(from); | |
1118 | return; | |
718e3744 | 1119 | } |
1120 | ||
d62a17ae | 1121 | /* It is also worth checking to see whether the response is from one |
1122 | of the router's own addresses. */ | |
1123 | ||
1124 | ; /* Alredy done in rip_read () */ | |
1125 | ||
1126 | /* Update RIP peer. */ | |
1127 | rip_peer_update(from, packet->version); | |
1128 | ||
1129 | /* Set RTE pointer. */ | |
1130 | rte = packet->rte; | |
1131 | ||
1132 | for (lim = (caddr_t)packet + size; (caddr_t)rte < lim; rte++) { | |
1133 | /* RIPv2 authentication check. */ | |
1134 | /* If the Address Family Identifier of the first (and only the | |
1135 | first) entry in the message is 0xFFFF, then the remainder of | |
1136 | the entry contains the authentication. */ | |
1137 | /* If the packet gets here it means authentication enabled */ | |
1138 | /* Check is done in rip_read(). So, just skipping it */ | |
1139 | if (packet->version == RIPv2 && rte == packet->rte | |
1140 | && rte->family == htons(RIP_FAMILY_AUTH)) | |
1141 | continue; | |
1142 | ||
1143 | if (rte->family != htons(AF_INET)) { | |
1144 | /* Address family check. RIP only supports AF_INET. */ | |
1145 | zlog_info("Unsupported family %d from %s.", | |
1146 | ntohs(rte->family), | |
1147 | inet_ntoa(from->sin_addr)); | |
1148 | continue; | |
718e3744 | 1149 | } |
d62a17ae | 1150 | |
1151 | /* - is the destination address valid (e.g., unicast; not net 0 | |
1152 | or 127) */ | |
1153 | if (!rip_destination_check(rte->prefix)) { | |
1154 | zlog_info( | |
1155 | "Network is net 0 or net 127 or it is not unicast network"); | |
1156 | rip_peer_bad_route(from); | |
1157 | continue; | |
718e3744 | 1158 | } |
1159 | ||
d62a17ae | 1160 | /* Convert metric value to host byte order. */ |
1161 | rte->metric = ntohl(rte->metric); | |
718e3744 | 1162 | |
d62a17ae | 1163 | /* - is the metric valid (i.e., between 1 and 16, inclusive) */ |
1164 | if (!(rte->metric >= 1 && rte->metric <= 16)) { | |
1165 | zlog_info("Route's metric is not in the 1-16 range."); | |
1166 | rip_peer_bad_route(from); | |
1167 | continue; | |
1168 | } | |
718e3744 | 1169 | |
d62a17ae | 1170 | /* RIPv1 does not have nexthop value. */ |
1171 | if (packet->version == RIPv1 && rte->nexthop.s_addr != 0) { | |
1172 | zlog_info("RIPv1 packet with nexthop value %s", | |
1173 | inet_ntoa(rte->nexthop)); | |
1174 | rip_peer_bad_route(from); | |
1175 | continue; | |
1176 | } | |
718e3744 | 1177 | |
d62a17ae | 1178 | /* That is, if the provided information is ignored, a possibly |
1179 | sub-optimal, but absolutely valid, route may be taken. If | |
1180 | the received Next Hop is not directly reachable, it should be | |
1181 | treated as 0.0.0.0. */ | |
1182 | if (packet->version == RIPv2 && rte->nexthop.s_addr != 0) { | |
1183 | u_int32_t addrval; | |
1184 | ||
1185 | /* Multicast address check. */ | |
1186 | addrval = ntohl(rte->nexthop.s_addr); | |
1187 | if (IN_CLASSD(addrval)) { | |
1188 | zlog_info( | |
1189 | "Nexthop %s is multicast address, skip this rte", | |
1190 | inet_ntoa(rte->nexthop)); | |
1191 | continue; | |
1192 | } | |
1193 | ||
1194 | if (!if_lookup_address((void *)&rte->nexthop, AF_INET, | |
1195 | VRF_DEFAULT)) { | |
1196 | struct route_node *rn; | |
1197 | struct rip_info *rinfo; | |
1198 | ||
1199 | rn = route_node_match_ipv4(rip->table, | |
1200 | &rte->nexthop); | |
1201 | ||
1202 | if (rn) { | |
1203 | rinfo = rn->info; | |
1204 | ||
1205 | if (rinfo->type == ZEBRA_ROUTE_RIP | |
1206 | && rinfo->sub_type | |
1207 | == RIP_ROUTE_RTE) { | |
1208 | if (IS_RIP_DEBUG_EVENT) | |
1209 | zlog_debug( | |
1210 | "Next hop %s is on RIP network. Set nexthop to the packet's originator", | |
1211 | inet_ntoa( | |
1212 | rte->nexthop)); | |
1213 | rte->nexthop = rinfo->from; | |
1214 | } else { | |
1215 | if (IS_RIP_DEBUG_EVENT) | |
1216 | zlog_debug( | |
1217 | "Next hop %s is not directly reachable. Treat it as 0.0.0.0", | |
1218 | inet_ntoa( | |
1219 | rte->nexthop)); | |
1220 | rte->nexthop.s_addr = 0; | |
1221 | } | |
1222 | ||
1223 | route_unlock_node(rn); | |
1224 | } else { | |
1225 | if (IS_RIP_DEBUG_EVENT) | |
1226 | zlog_debug( | |
1227 | "Next hop %s is not directly reachable. Treat it as 0.0.0.0", | |
1228 | inet_ntoa( | |
1229 | rte->nexthop)); | |
1230 | rte->nexthop.s_addr = 0; | |
1231 | } | |
1232 | } | |
1233 | } | |
718e3744 | 1234 | |
d62a17ae | 1235 | /* For RIPv1, there won't be a valid netmask. |
1236 | ||
1237 | This is a best guess at the masks. If everyone was using old | |
1238 | Ciscos before the 'ip subnet zero' option, it would be almost | |
1239 | right too :-) | |
1240 | ||
1241 | Cisco summarize ripv1 advertisments to the classful boundary | |
1242 | (/16 for class B's) except when the RIP packet does to inside | |
1243 | the classful network in question. */ | |
1244 | ||
1245 | if ((packet->version == RIPv1 && rte->prefix.s_addr != 0) | |
1246 | || (packet->version == RIPv2 | |
1247 | && (rte->prefix.s_addr != 0 | |
1248 | && rte->mask.s_addr == 0))) { | |
1249 | u_int32_t destination; | |
1250 | ||
1251 | if (subnetted == -1) { | |
1252 | memcpy(&ifaddr, ifc->address, | |
1253 | sizeof(struct prefix_ipv4)); | |
1254 | memcpy(&ifaddrclass, &ifaddr, | |
1255 | sizeof(struct prefix_ipv4)); | |
1256 | apply_classful_mask_ipv4(&ifaddrclass); | |
1257 | subnetted = 0; | |
1258 | if (ifaddr.prefixlen > ifaddrclass.prefixlen) | |
1259 | subnetted = 1; | |
1260 | } | |
1261 | ||
1262 | destination = ntohl(rte->prefix.s_addr); | |
1263 | ||
1264 | if (IN_CLASSA(destination)) | |
1265 | masklen2ip(8, &rte->mask); | |
1266 | else if (IN_CLASSB(destination)) | |
1267 | masklen2ip(16, &rte->mask); | |
1268 | else if (IN_CLASSC(destination)) | |
1269 | masklen2ip(24, &rte->mask); | |
1270 | ||
1271 | if (subnetted == 1) | |
1272 | masklen2ip(ifaddrclass.prefixlen, | |
1273 | (struct in_addr *)&destination); | |
1274 | if ((subnetted == 1) | |
1275 | && ((rte->prefix.s_addr & destination) | |
1276 | == ifaddrclass.prefix.s_addr)) { | |
1277 | masklen2ip(ifaddr.prefixlen, &rte->mask); | |
1278 | if ((rte->prefix.s_addr & rte->mask.s_addr) | |
1279 | != rte->prefix.s_addr) | |
1280 | masklen2ip(32, &rte->mask); | |
1281 | if (IS_RIP_DEBUG_EVENT) | |
1282 | zlog_debug("Subnetted route %s", | |
1283 | inet_ntoa(rte->prefix)); | |
1284 | } else { | |
1285 | if ((rte->prefix.s_addr & rte->mask.s_addr) | |
1286 | != rte->prefix.s_addr) | |
1287 | continue; | |
1288 | } | |
1289 | ||
1290 | if (IS_RIP_DEBUG_EVENT) { | |
1291 | zlog_debug("Resultant route %s", | |
1292 | inet_ntoa(rte->prefix)); | |
1293 | zlog_debug("Resultant mask %s", | |
1294 | inet_ntoa(rte->mask)); | |
1295 | } | |
1296 | } | |
1297 | ||
1298 | /* In case of RIPv2, if prefix in RTE is not netmask applied one | |
1299 | ignore the entry. */ | |
1300 | if ((packet->version == RIPv2) && (rte->mask.s_addr != 0) | |
1301 | && ((rte->prefix.s_addr & rte->mask.s_addr) | |
1302 | != rte->prefix.s_addr)) { | |
1303 | zlog_warn( | |
1304 | "RIPv2 address %s is not mask /%d applied one", | |
1305 | inet_ntoa(rte->prefix), ip_masklen(rte->mask)); | |
1306 | rip_peer_bad_route(from); | |
1307 | continue; | |
1308 | } | |
1309 | ||
1310 | /* Default route's netmask is ignored. */ | |
1311 | if (packet->version == RIPv2 && (rte->prefix.s_addr == 0) | |
1312 | && (rte->mask.s_addr != 0)) { | |
1313 | if (IS_RIP_DEBUG_EVENT) | |
1314 | zlog_debug( | |
1315 | "Default route with non-zero netmask. Set zero to netmask"); | |
1316 | rte->mask.s_addr = 0; | |
1317 | } | |
1318 | ||
1319 | /* Routing table updates. */ | |
1320 | rip_rte_process(rte, from, ifc->ifp); | |
718e3744 | 1321 | } |
718e3744 | 1322 | } |
1323 | ||
a4e987e0 | 1324 | /* Make socket for RIP protocol. */ |
d62a17ae | 1325 | static int rip_create_socket(void) |
1326 | { | |
1327 | int ret; | |
1328 | int sock; | |
1329 | struct sockaddr_in addr; | |
1330 | ||
1331 | memset(&addr, 0, sizeof(struct sockaddr_in)); | |
1332 | addr.sin_family = AF_INET; | |
1333 | addr.sin_addr.s_addr = INADDR_ANY; | |
6f0e3f6e | 1334 | #ifdef HAVE_STRUCT_SOCKADDR_IN_SIN_LEN |
d62a17ae | 1335 | addr.sin_len = sizeof(struct sockaddr_in); |
6f0e3f6e | 1336 | #endif /* HAVE_STRUCT_SOCKADDR_IN_SIN_LEN */ |
d62a17ae | 1337 | /* sending port must always be the RIP port */ |
1338 | addr.sin_port = htons(RIP_PORT_DEFAULT); | |
1339 | ||
1340 | /* Make datagram socket. */ | |
1341 | sock = socket(AF_INET, SOCK_DGRAM, IPPROTO_UDP); | |
1342 | if (sock < 0) { | |
1343 | zlog_err("Cannot create UDP socket: %s", safe_strerror(errno)); | |
1344 | exit(1); | |
1345 | } | |
1346 | ||
1347 | sockopt_broadcast(sock); | |
1348 | sockopt_reuseaddr(sock); | |
1349 | sockopt_reuseport(sock); | |
1350 | setsockopt_ipv4_multicast_loop(sock, 0); | |
a4e987e0 | 1351 | #ifdef RIP_RECVMSG |
d62a17ae | 1352 | setsockopt_pktinfo(sock); |
a4e987e0 | 1353 | #endif /* RIP_RECVMSG */ |
78b31d5c | 1354 | #ifdef IPTOS_PREC_INTERNETCONTROL |
d62a17ae | 1355 | setsockopt_ipv4_tos(sock, IPTOS_PREC_INTERNETCONTROL); |
78b31d5c | 1356 | #endif |
a4e987e0 | 1357 | |
d62a17ae | 1358 | if (ripd_privs.change(ZPRIVS_RAISE)) |
1359 | zlog_err("rip_create_socket: could not raise privs"); | |
1360 | setsockopt_so_recvbuf(sock, RIP_UDP_RCV_BUF); | |
1361 | if ((ret = bind(sock, (struct sockaddr *)&addr, sizeof(addr))) < 0) | |
1362 | ||
1363 | { | |
1364 | int save_errno = errno; | |
1365 | if (ripd_privs.change(ZPRIVS_LOWER)) | |
1366 | zlog_err("rip_create_socket: could not lower privs"); | |
1367 | ||
1368 | zlog_err("%s: Can't bind socket %d to %s port %d: %s", __func__, | |
1369 | sock, inet_ntoa(addr.sin_addr), | |
1370 | (int)ntohs(addr.sin_port), safe_strerror(save_errno)); | |
1371 | ||
1372 | close(sock); | |
1373 | return ret; | |
1374 | } | |
1375 | ||
1376 | if (ripd_privs.change(ZPRIVS_LOWER)) | |
1377 | zlog_err("rip_create_socket: could not lower privs"); | |
1378 | ||
1379 | return sock; | |
a4e987e0 | 1380 | } |
1381 | ||
c49ad8f1 | 1382 | /* RIP packet send to destination address, on interface denoted by |
1383 | * by connected argument. NULL to argument denotes destination should be | |
1384 | * should be RIP multicast group | |
1385 | */ | |
d62a17ae | 1386 | static int rip_send_packet(u_char *buf, int size, struct sockaddr_in *to, |
1387 | struct connected *ifc) | |
1388 | { | |
1389 | int ret; | |
1390 | struct sockaddr_in sin; | |
1391 | ||
1392 | assert(ifc != NULL); | |
1393 | ||
1394 | if (IS_RIP_DEBUG_PACKET) { | |
f69bd9da | 1395 | #define ADDRESS_SIZE 20 |
d62a17ae | 1396 | char dst[ADDRESS_SIZE]; |
1397 | dst[ADDRESS_SIZE - 1] = '\0'; | |
1398 | ||
1399 | if (to) { | |
1400 | strncpy(dst, inet_ntoa(to->sin_addr), ADDRESS_SIZE - 1); | |
1401 | } else { | |
1402 | sin.sin_addr.s_addr = htonl(INADDR_RIP_GROUP); | |
1403 | strncpy(dst, inet_ntoa(sin.sin_addr), ADDRESS_SIZE - 1); | |
1404 | } | |
f69bd9da | 1405 | #undef ADDRESS_SIZE |
d62a17ae | 1406 | zlog_debug("rip_send_packet %s > %s (%s)", |
1407 | inet_ntoa(ifc->address->u.prefix4), dst, | |
1408 | ifc->ifp->name); | |
1409 | } | |
1410 | ||
1411 | if (CHECK_FLAG(ifc->flags, ZEBRA_IFA_SECONDARY)) { | |
1412 | /* | |
1413 | * ZEBRA_IFA_SECONDARY is set on linux when an interface is | |
1414 | * configured | |
1415 | * with multiple addresses on the same subnet: the first address | |
1416 | * on the subnet is configured "primary", and all subsequent | |
1417 | * addresses | |
1418 | * on that subnet are treated as "secondary" addresses. | |
1419 | * In order to avoid routing-table bloat on other rip listeners, | |
1420 | * we do not send out RIP packets with ZEBRA_IFA_SECONDARY | |
1421 | * source addrs. | |
1422 | * XXX Since Linux is the only system for which the | |
1423 | * ZEBRA_IFA_SECONDARY | |
1424 | * flag is set, we would end up sending a packet for a | |
1425 | * "secondary" | |
1426 | * source address on non-linux systems. | |
1427 | */ | |
1428 | if (IS_RIP_DEBUG_PACKET) | |
1429 | zlog_debug("duplicate dropped"); | |
1430 | return 0; | |
1431 | } | |
1432 | ||
1433 | /* Make destination address. */ | |
1434 | memset(&sin, 0, sizeof(struct sockaddr_in)); | |
1435 | sin.sin_family = AF_INET; | |
6f0e3f6e | 1436 | #ifdef HAVE_STRUCT_SOCKADDR_IN_SIN_LEN |
d62a17ae | 1437 | sin.sin_len = sizeof(struct sockaddr_in); |
6f0e3f6e | 1438 | #endif /* HAVE_STRUCT_SOCKADDR_IN_SIN_LEN */ |
718e3744 | 1439 | |
d62a17ae | 1440 | /* When destination is specified, use it's port and address. */ |
1441 | if (to) { | |
1442 | sin.sin_port = to->sin_port; | |
1443 | sin.sin_addr = to->sin_addr; | |
1444 | } else { | |
1445 | sin.sin_port = htons(RIP_PORT_DEFAULT); | |
1446 | sin.sin_addr.s_addr = htonl(INADDR_RIP_GROUP); | |
ae735d2d | 1447 | |
d62a17ae | 1448 | rip_interface_multicast_set(rip->sock, ifc); |
1449 | } | |
718e3744 | 1450 | |
d62a17ae | 1451 | ret = sendto(rip->sock, buf, size, 0, (struct sockaddr *)&sin, |
1452 | sizeof(struct sockaddr_in)); | |
718e3744 | 1453 | |
d62a17ae | 1454 | if (IS_RIP_DEBUG_EVENT) |
1455 | zlog_debug("SEND to %s.%d", inet_ntoa(sin.sin_addr), | |
1456 | ntohs(sin.sin_port)); | |
718e3744 | 1457 | |
d62a17ae | 1458 | if (ret < 0) |
1459 | zlog_warn("can't send packet : %s", safe_strerror(errno)); | |
718e3744 | 1460 | |
d62a17ae | 1461 | return ret; |
718e3744 | 1462 | } |
1463 | ||
1464 | /* Add redistributed route to RIP table. */ | |
d62a17ae | 1465 | void rip_redistribute_add(int type, int sub_type, struct prefix_ipv4 *p, |
3f5682c8 | 1466 | struct nexthop *nh, |
d62a17ae | 1467 | unsigned int metric, unsigned char distance, |
1468 | route_tag_t tag) | |
1469 | { | |
1470 | int ret; | |
1471 | struct route_node *rp = NULL; | |
1472 | struct rip_info *rinfo = NULL, newinfo; | |
1473 | struct list *list = NULL; | |
1474 | ||
1475 | /* Redistribute route */ | |
1476 | ret = rip_destination_check(p->prefix); | |
1477 | if (!ret) | |
1478 | return; | |
1479 | ||
1480 | rp = route_node_get(rip->table, (struct prefix *)p); | |
1481 | ||
1482 | memset(&newinfo, 0, sizeof(struct rip_info)); | |
1483 | newinfo.type = type; | |
1484 | newinfo.sub_type = sub_type; | |
d62a17ae | 1485 | newinfo.metric = 1; |
1486 | newinfo.external_metric = metric; | |
1487 | newinfo.distance = distance; | |
1488 | if (tag <= UINT16_MAX) /* RIP only supports 16 bit tags */ | |
1489 | newinfo.tag = tag; | |
1490 | newinfo.rp = rp; | |
3f5682c8 | 1491 | newinfo.nh = *nh; |
d62a17ae | 1492 | |
1493 | if ((list = rp->info) != NULL && listcount(list) != 0) { | |
1494 | rinfo = listgetdata(listhead(list)); | |
1495 | ||
1496 | if (rinfo->type == ZEBRA_ROUTE_CONNECT | |
1497 | && rinfo->sub_type == RIP_ROUTE_INTERFACE | |
1498 | && rinfo->metric != RIP_METRIC_INFINITY) { | |
1499 | route_unlock_node(rp); | |
1500 | return; | |
1501 | } | |
718e3744 | 1502 | |
d62a17ae | 1503 | /* Manually configured RIP route check. */ |
1504 | if (rinfo->type == ZEBRA_ROUTE_RIP | |
1505 | && ((rinfo->sub_type == RIP_ROUTE_STATIC) | |
1506 | || (rinfo->sub_type == RIP_ROUTE_DEFAULT))) { | |
1507 | if (type != ZEBRA_ROUTE_RIP | |
1508 | || ((sub_type != RIP_ROUTE_STATIC) | |
1509 | && (sub_type != RIP_ROUTE_DEFAULT))) { | |
1510 | route_unlock_node(rp); | |
1511 | return; | |
1512 | } | |
1513 | } | |
1514 | ||
11ff7164 | 1515 | (void)rip_ecmp_replace(&newinfo); |
d62a17ae | 1516 | route_unlock_node(rp); |
1517 | } else | |
11ff7164 | 1518 | (void)rip_ecmp_add(&newinfo); |
d62a17ae | 1519 | |
1520 | if (IS_RIP_DEBUG_EVENT) { | |
3f5682c8 DS |
1521 | zlog_debug( |
1522 | "Redistribute new prefix %s/%d", | |
1523 | inet_ntoa(p->prefix), p->prefixlen); | |
718e3744 | 1524 | } |
1525 | ||
d62a17ae | 1526 | rip_event(RIP_TRIGGERED_UPDATE, 0); |
718e3744 | 1527 | } |
1528 | ||
1529 | /* Delete redistributed route from RIP table. */ | |
d62a17ae | 1530 | void rip_redistribute_delete(int type, int sub_type, struct prefix_ipv4 *p, |
1531 | ifindex_t ifindex) | |
1532 | { | |
1533 | int ret; | |
1534 | struct route_node *rp; | |
1535 | struct rip_info *rinfo; | |
1536 | ||
1537 | ret = rip_destination_check(p->prefix); | |
1538 | if (!ret) | |
1539 | return; | |
1540 | ||
1541 | rp = route_node_lookup(rip->table, (struct prefix *)p); | |
1542 | if (rp) { | |
1543 | struct list *list = rp->info; | |
1544 | ||
1545 | if (list != NULL && listcount(list) != 0) { | |
1546 | rinfo = listgetdata(listhead(list)); | |
1547 | if (rinfo != NULL && rinfo->type == type | |
1548 | && rinfo->sub_type == sub_type | |
dd127197 | 1549 | && rinfo->nh.ifindex == ifindex) { |
d62a17ae | 1550 | /* Perform poisoned reverse. */ |
1551 | rinfo->metric = RIP_METRIC_INFINITY; | |
1552 | RIP_TIMER_ON(rinfo->t_garbage_collect, | |
1553 | rip_garbage_collect, | |
1554 | rip->garbage_time); | |
1555 | RIP_TIMER_OFF(rinfo->t_timeout); | |
1556 | rinfo->flags |= RIP_RTF_CHANGED; | |
1557 | ||
1558 | if (IS_RIP_DEBUG_EVENT) | |
1559 | zlog_debug( | |
14aa0c3d | 1560 | "Poison %s/%d on the interface %s with an " |
d62a17ae | 1561 | "infinity metric [delete]", |
1562 | inet_ntoa(p->prefix), | |
1563 | p->prefixlen, | |
1564 | ifindex2ifname(ifindex, | |
1565 | VRF_DEFAULT)); | |
1566 | ||
1567 | rip_event(RIP_TRIGGERED_UPDATE, 0); | |
1568 | } | |
1569 | } | |
1570 | route_unlock_node(rp); | |
1571 | } | |
718e3744 | 1572 | } |
1573 | ||
1574 | /* Response to request called from rip_read ().*/ | |
d62a17ae | 1575 | static void rip_request_process(struct rip_packet *packet, int size, |
1576 | struct sockaddr_in *from, struct connected *ifc) | |
1577 | { | |
1578 | caddr_t lim; | |
1579 | struct rte *rte; | |
1580 | struct prefix_ipv4 p; | |
1581 | struct route_node *rp; | |
1582 | struct rip_info *rinfo; | |
1583 | struct rip_interface *ri; | |
1584 | ||
1585 | /* Does not reponse to the requests on the loopback interfaces */ | |
1586 | if (if_is_loopback(ifc->ifp)) | |
1587 | return; | |
1588 | ||
1589 | /* Check RIP process is enabled on this interface. */ | |
1590 | ri = ifc->ifp->info; | |
1591 | if (!ri->running) | |
1592 | return; | |
1593 | ||
1594 | /* When passive interface is specified, suppress responses */ | |
1595 | if (ri->passive) | |
1596 | return; | |
1597 | ||
1598 | /* RIP peer update. */ | |
1599 | rip_peer_update(from, packet->version); | |
1600 | ||
1601 | lim = ((caddr_t)packet) + size; | |
1602 | rte = packet->rte; | |
1603 | ||
1604 | /* The Request is processed entry by entry. If there are no | |
1605 | entries, no response is given. */ | |
1606 | if (lim == (caddr_t)rte) | |
1607 | return; | |
1608 | ||
1609 | /* There is one special case. If there is exactly one entry in the | |
1610 | request, and it has an address family identifier of zero and a | |
1611 | metric of infinity (i.e., 16), then this is a request to send the | |
1612 | entire routing table. */ | |
1613 | if (lim == ((caddr_t)(rte + 1)) && ntohs(rte->family) == 0 | |
1614 | && ntohl(rte->metric) == RIP_METRIC_INFINITY) { | |
1615 | /* All route with split horizon */ | |
1616 | rip_output_process(ifc, from, rip_all_route, packet->version); | |
1617 | } else { | |
1618 | if (ntohs(rte->family) != AF_INET) | |
1619 | return; | |
1620 | ||
1621 | /* Examine the list of RTEs in the Request one by one. For each | |
1622 | entry, look up the destination in the router's routing | |
1623 | database and, if there is a route, put that route's metric in | |
1624 | the metric field of the RTE. If there is no explicit route | |
1625 | to the specified destination, put infinity in the metric | |
1626 | field. Once all the entries have been filled in, change the | |
1627 | command from Request to Response and send the datagram back | |
1628 | to the requestor. */ | |
1629 | p.family = AF_INET; | |
1630 | ||
1631 | for (; ((caddr_t)rte) < lim; rte++) { | |
1632 | p.prefix = rte->prefix; | |
1633 | p.prefixlen = ip_masklen(rte->mask); | |
1634 | apply_mask_ipv4(&p); | |
1635 | ||
1636 | rp = route_node_lookup(rip->table, (struct prefix *)&p); | |
1637 | if (rp) { | |
1638 | rinfo = listgetdata( | |
1639 | listhead((struct list *)rp->info)); | |
1640 | rte->metric = htonl(rinfo->metric); | |
1641 | route_unlock_node(rp); | |
1642 | } else | |
1643 | rte->metric = htonl(RIP_METRIC_INFINITY); | |
1644 | } | |
1645 | packet->command = RIP_RESPONSE; | |
4e054866 | 1646 | |
d62a17ae | 1647 | rip_send_packet((u_char *)packet, size, from, ifc); |
1648 | } | |
1649 | rip_global_queries++; | |
718e3744 | 1650 | } |
1651 | ||
1652 | #if RIP_RECVMSG | |
1653 | /* Set IPv6 packet info to the socket. */ | |
d62a17ae | 1654 | static int setsockopt_pktinfo(int sock) |
718e3744 | 1655 | { |
d62a17ae | 1656 | int ret; |
1657 | int val = 1; | |
1658 | ||
1659 | ret = setsockopt(sock, IPPROTO_IP, IP_PKTINFO, &val, sizeof(val)); | |
1660 | if (ret < 0) | |
1661 | zlog_warn("Can't setsockopt IP_PKTINFO : %s", | |
1662 | safe_strerror(errno)); | |
1663 | return ret; | |
718e3744 | 1664 | } |
1665 | ||
1666 | /* Read RIP packet by recvmsg function. */ | |
d62a17ae | 1667 | int rip_recvmsg(int sock, u_char *buf, int size, struct sockaddr_in *from, |
1668 | ifindex_t *ifindex) | |
1669 | { | |
1670 | int ret; | |
1671 | struct msghdr msg; | |
1672 | struct iovec iov; | |
1673 | struct cmsghdr *ptr; | |
1674 | char adata[1024]; | |
1675 | ||
0af35d90 | 1676 | memset(&msg, 0, sizeof(msg)); |
d62a17ae | 1677 | msg.msg_name = (void *)from; |
1678 | msg.msg_namelen = sizeof(struct sockaddr_in); | |
1679 | msg.msg_iov = &iov; | |
1680 | msg.msg_iovlen = 1; | |
1681 | msg.msg_control = (void *)adata; | |
1682 | msg.msg_controllen = sizeof adata; | |
1683 | iov.iov_base = buf; | |
1684 | iov.iov_len = size; | |
1685 | ||
1686 | ret = recvmsg(sock, &msg, 0); | |
1687 | if (ret < 0) | |
1688 | return ret; | |
718e3744 | 1689 | |
d62a17ae | 1690 | for (ptr = ZCMSG_FIRSTHDR(&msg); ptr != NULL; |
1691 | ptr = CMSG_NXTHDR(&msg, ptr)) | |
1692 | if (ptr->cmsg_level == IPPROTO_IP | |
1693 | && ptr->cmsg_type == IP_PKTINFO) { | |
1694 | struct in_pktinfo *pktinfo; | |
1695 | int i; | |
1696 | ||
1697 | pktinfo = (struct in_pktinfo *)CMSG_DATA(ptr); | |
1698 | i = pktinfo->ipi_ifindex; | |
1699 | } | |
1700 | return ret; | |
718e3744 | 1701 | } |
1702 | ||
1703 | /* RIP packet read function. */ | |
d62a17ae | 1704 | int rip_read_new(struct thread *t) |
1705 | { | |
1706 | int ret; | |
1707 | int sock; | |
1708 | char buf[RIP_PACKET_MAXSIZ]; | |
1709 | struct sockaddr_in from; | |
1710 | ifindex_t ifindex; | |
1711 | ||
1712 | /* Fetch socket then register myself. */ | |
1713 | sock = THREAD_FD(t); | |
1714 | rip_event(RIP_READ, sock); | |
1715 | ||
1716 | /* Read RIP packet. */ | |
1717 | ret = rip_recvmsg(sock, buf, RIP_PACKET_MAXSIZ, &from, (int *)&ifindex); | |
1718 | if (ret < 0) { | |
1719 | zlog_warn("Can't read RIP packet: %s", safe_strerror(errno)); | |
1720 | return ret; | |
1721 | } | |
1722 | ||
1723 | return ret; | |
718e3744 | 1724 | } |
1725 | #endif /* RIP_RECVMSG */ | |
1726 | ||
1727 | /* First entry point of RIP packet. */ | |
d62a17ae | 1728 | static int rip_read(struct thread *t) |
1729 | { | |
1730 | int sock; | |
1731 | int ret; | |
1732 | int rtenum; | |
1733 | union rip_buf rip_buf; | |
1734 | struct rip_packet *packet; | |
1735 | struct sockaddr_in from; | |
1736 | int len; | |
1737 | int vrecv; | |
1738 | socklen_t fromlen; | |
1739 | struct interface *ifp = NULL; | |
1740 | struct connected *ifc; | |
1741 | struct rip_interface *ri; | |
1742 | struct prefix p; | |
1743 | ||
1744 | /* Fetch socket then register myself. */ | |
1745 | sock = THREAD_FD(t); | |
1746 | rip->t_read = NULL; | |
1747 | ||
1748 | /* Add myself to tne next event */ | |
1749 | rip_event(RIP_READ, sock); | |
1750 | ||
1751 | /* RIPd manages only IPv4. */ | |
1752 | memset(&from, 0, sizeof(struct sockaddr_in)); | |
1753 | fromlen = sizeof(struct sockaddr_in); | |
1754 | ||
1755 | len = recvfrom(sock, (char *)&rip_buf.buf, sizeof(rip_buf.buf), 0, | |
1756 | (struct sockaddr *)&from, &fromlen); | |
1757 | if (len < 0) { | |
1758 | zlog_info("recvfrom failed: %s", safe_strerror(errno)); | |
1759 | return len; | |
1760 | } | |
1761 | ||
1762 | /* Check is this packet comming from myself? */ | |
1763 | if (if_check_address(from.sin_addr)) { | |
1764 | if (IS_RIP_DEBUG_PACKET) | |
1765 | zlog_debug("ignore packet comes from myself"); | |
1766 | return -1; | |
1767 | } | |
1768 | ||
1769 | /* Which interface is this packet comes from. */ | |
1770 | ifc = if_lookup_address((void *)&from.sin_addr, AF_INET, VRF_DEFAULT); | |
1771 | if (ifc) | |
1772 | ifp = ifc->ifp; | |
1773 | ||
1774 | /* RIP packet received */ | |
1775 | if (IS_RIP_DEBUG_EVENT) | |
1776 | zlog_debug("RECV packet from %s port %d on %s", | |
1777 | inet_ntoa(from.sin_addr), ntohs(from.sin_port), | |
1778 | ifp ? ifp->name : "unknown"); | |
1779 | ||
1780 | /* If this packet come from unknown interface, ignore it. */ | |
1781 | if (ifp == NULL) { | |
1782 | zlog_info( | |
1783 | "rip_read: cannot find interface for packet from %s port %d", | |
1784 | inet_ntoa(from.sin_addr), ntohs(from.sin_port)); | |
1785 | return -1; | |
1786 | } | |
1787 | ||
1788 | p.family = AF_INET; | |
1789 | p.u.prefix4 = from.sin_addr; | |
1790 | p.prefixlen = IPV4_MAX_BITLEN; | |
1791 | ||
1792 | ifc = connected_lookup_prefix(ifp, &p); | |
1793 | ||
1794 | if (ifc == NULL) { | |
1795 | zlog_info( | |
1796 | "rip_read: cannot find connected address for packet from %s " | |
1797 | "port %d on interface %s", | |
1798 | inet_ntoa(from.sin_addr), ntohs(from.sin_port), | |
1799 | ifp->name); | |
1800 | return -1; | |
1801 | } | |
1802 | ||
1803 | /* Packet length check. */ | |
1804 | if (len < RIP_PACKET_MINSIZ) { | |
1805 | zlog_warn("packet size %d is smaller than minimum size %d", len, | |
1806 | RIP_PACKET_MINSIZ); | |
1807 | rip_peer_bad_packet(&from); | |
1808 | return len; | |
1809 | } | |
1810 | if (len > RIP_PACKET_MAXSIZ) { | |
1811 | zlog_warn("packet size %d is larger than max size %d", len, | |
1812 | RIP_PACKET_MAXSIZ); | |
1813 | rip_peer_bad_packet(&from); | |
1814 | return len; | |
1815 | } | |
1816 | ||
1817 | /* Packet alignment check. */ | |
1818 | if ((len - RIP_PACKET_MINSIZ) % 20) { | |
1819 | zlog_warn("packet size %d is wrong for RIP packet alignment", | |
1820 | len); | |
1821 | rip_peer_bad_packet(&from); | |
1822 | return len; | |
1823 | } | |
1824 | ||
1825 | /* Set RTE number. */ | |
1826 | rtenum = ((len - RIP_PACKET_MINSIZ) / 20); | |
1827 | ||
1828 | /* For easy to handle. */ | |
1829 | packet = &rip_buf.rip_packet; | |
1830 | ||
1831 | /* RIP version check. */ | |
1832 | if (packet->version == 0) { | |
1833 | zlog_info("version 0 with command %d received.", | |
1834 | packet->command); | |
1835 | rip_peer_bad_packet(&from); | |
1836 | return -1; | |
1837 | } | |
1838 | ||
1839 | /* Dump RIP packet. */ | |
1840 | if (IS_RIP_DEBUG_RECV) | |
1841 | rip_packet_dump(packet, len, "RECV"); | |
1842 | ||
1843 | /* RIP version adjust. This code should rethink now. RFC1058 says | |
1844 | that "Version 1 implementations are to ignore this extra data and | |
1845 | process only the fields specified in this document.". So RIPv3 | |
1846 | packet should be treated as RIPv1 ignoring must be zero field. */ | |
1847 | if (packet->version > RIPv2) | |
1848 | packet->version = RIPv2; | |
1849 | ||
1850 | /* Is RIP running or is this RIP neighbor ?*/ | |
1851 | ri = ifp->info; | |
1852 | if (!ri->running && !rip_neighbor_lookup(&from)) { | |
1853 | if (IS_RIP_DEBUG_EVENT) | |
1854 | zlog_debug("RIP is not enabled on interface %s.", | |
1855 | ifp->name); | |
1856 | rip_peer_bad_packet(&from); | |
1857 | return -1; | |
1858 | } | |
1859 | ||
1860 | /* RIP Version check. RFC2453, 4.6 and 5.1 */ | |
1861 | vrecv = ((ri->ri_receive == RI_RIP_UNSPEC) ? rip->version_recv | |
1862 | : ri->ri_receive); | |
1863 | if (vrecv == RI_RIP_VERSION_NONE | |
1864 | || ((packet->version == RIPv1) && !(vrecv & RIPv1)) | |
1865 | || ((packet->version == RIPv2) && !(vrecv & RIPv2))) { | |
1866 | if (IS_RIP_DEBUG_PACKET) | |
1867 | zlog_debug( | |
1868 | " packet's v%d doesn't fit to if version spec", | |
1869 | packet->version); | |
1870 | rip_peer_bad_packet(&from); | |
1871 | return -1; | |
1872 | } | |
1873 | ||
1874 | /* RFC2453 5.2 If the router is not configured to authenticate RIP-2 | |
1875 | messages, then RIP-1 and unauthenticated RIP-2 messages will be | |
1876 | accepted; authenticated RIP-2 messages shall be discarded. */ | |
1877 | if ((ri->auth_type == RIP_NO_AUTH) && rtenum | |
1878 | && (packet->version == RIPv2) | |
1879 | && (packet->rte->family == htons(RIP_FAMILY_AUTH))) { | |
1880 | if (IS_RIP_DEBUG_EVENT) | |
1881 | zlog_debug( | |
1882 | "packet RIPv%d is dropped because authentication disabled", | |
1883 | packet->version); | |
1884 | rip_peer_bad_packet(&from); | |
1885 | return -1; | |
1886 | } | |
1887 | ||
1888 | /* RFC: | |
1889 | If the router is configured to authenticate RIP-2 messages, then | |
1890 | RIP-1 messages and RIP-2 messages which pass authentication | |
1891 | testing shall be accepted; unauthenticated and failed | |
1892 | authentication RIP-2 messages shall be discarded. For maximum | |
1893 | security, RIP-1 messages should be ignored when authentication is | |
1894 | in use (see section 4.1); otherwise, the routing information from | |
1895 | authenticated messages will be propagated by RIP-1 routers in an | |
1896 | unauthenticated manner. | |
1897 | */ | |
1898 | /* We make an exception for RIPv1 REQUEST packets, to which we'll | |
1899 | * always reply regardless of authentication settings, because: | |
1900 | * | |
1901 | * - if there other authorised routers on-link, the REQUESTor can | |
1902 | * passively obtain the routing updates anyway | |
1903 | * - if there are no other authorised routers on-link, RIP can | |
1904 | * easily be disabled for the link to prevent giving out information | |
1905 | * on state of this routers RIP routing table.. | |
1906 | * | |
1907 | * I.e. if RIPv1 has any place anymore these days, it's as a very | |
1908 | * simple way to distribute routing information (e.g. to embedded | |
1909 | * hosts / appliances) and the ability to give out RIPv1 | |
1910 | * routing-information freely, while still requiring RIPv2 | |
1911 | * authentication for any RESPONSEs might be vaguely useful. | |
1912 | */ | |
1913 | if (ri->auth_type != RIP_NO_AUTH && packet->version == RIPv1) { | |
1914 | /* Discard RIPv1 messages other than REQUESTs */ | |
1915 | if (packet->command != RIP_REQUEST) { | |
1916 | if (IS_RIP_DEBUG_PACKET) | |
1917 | zlog_debug( | |
1918 | "RIPv1" | |
1919 | " dropped because authentication enabled"); | |
1920 | rip_peer_bad_packet(&from); | |
1921 | return -1; | |
1922 | } | |
1923 | } else if (ri->auth_type != RIP_NO_AUTH) { | |
1924 | const char *auth_desc; | |
1925 | ||
1926 | if (rtenum == 0) { | |
1927 | /* There definitely is no authentication in the packet. | |
1928 | */ | |
1929 | if (IS_RIP_DEBUG_PACKET) | |
1930 | zlog_debug( | |
1931 | "RIPv2 authentication failed: no auth RTE in packet"); | |
1932 | rip_peer_bad_packet(&from); | |
1933 | return -1; | |
1934 | } | |
1935 | ||
1936 | /* First RTE must be an Authentication Family RTE */ | |
1937 | if (packet->rte->family != htons(RIP_FAMILY_AUTH)) { | |
1938 | if (IS_RIP_DEBUG_PACKET) | |
1939 | zlog_debug( | |
1940 | "RIPv2" | |
1941 | " dropped because authentication enabled"); | |
1942 | rip_peer_bad_packet(&from); | |
1943 | return -1; | |
1944 | } | |
1945 | ||
1946 | /* Check RIPv2 authentication. */ | |
1947 | switch (ntohs(packet->rte->tag)) { | |
1948 | case RIP_AUTH_SIMPLE_PASSWORD: | |
1949 | auth_desc = "simple"; | |
1950 | ret = rip_auth_simple_password(packet->rte, &from, ifp); | |
1951 | break; | |
1952 | ||
1953 | case RIP_AUTH_MD5: | |
1954 | auth_desc = "MD5"; | |
1955 | ret = rip_auth_md5(packet, &from, len, ifp); | |
1956 | /* Reset RIP packet length to trim MD5 data. */ | |
1957 | len = ret; | |
1958 | break; | |
1959 | ||
1960 | default: | |
1961 | ret = 0; | |
1962 | auth_desc = "unknown type"; | |
1963 | if (IS_RIP_DEBUG_PACKET) | |
1964 | zlog_debug( | |
1965 | "RIPv2 Unknown authentication type %d", | |
1966 | ntohs(packet->rte->tag)); | |
1967 | } | |
1968 | ||
1969 | if (ret) { | |
1970 | if (IS_RIP_DEBUG_PACKET) | |
1971 | zlog_debug("RIPv2 %s authentication success", | |
1972 | auth_desc); | |
1973 | } else { | |
1974 | if (IS_RIP_DEBUG_PACKET) | |
1975 | zlog_debug("RIPv2 %s authentication failure", | |
1976 | auth_desc); | |
1977 | rip_peer_bad_packet(&from); | |
1978 | return -1; | |
1979 | } | |
1980 | } | |
1981 | ||
1982 | /* Process each command. */ | |
1983 | switch (packet->command) { | |
1984 | case RIP_RESPONSE: | |
1985 | rip_response_process(packet, len, &from, ifc); | |
1986 | break; | |
1987 | case RIP_REQUEST: | |
1988 | case RIP_POLL: | |
1989 | rip_request_process(packet, len, &from, ifc); | |
1990 | break; | |
1991 | case RIP_TRACEON: | |
1992 | case RIP_TRACEOFF: | |
1993 | zlog_info( | |
1994 | "Obsolete command %s received, please sent it to routed", | |
1995 | lookup_msg(rip_msg, packet->command, NULL)); | |
1996 | rip_peer_bad_packet(&from); | |
1997 | break; | |
1998 | case RIP_POLL_ENTRY: | |
1999 | zlog_info("Obsolete command %s received", | |
2000 | lookup_msg(rip_msg, packet->command, NULL)); | |
2001 | rip_peer_bad_packet(&from); | |
2002 | break; | |
2003 | default: | |
2004 | zlog_info("Unknown RIP command %d received", packet->command); | |
2005 | rip_peer_bad_packet(&from); | |
2006 | break; | |
2007 | } | |
2008 | ||
2009 | return len; | |
718e3744 | 2010 | } |
2011 | ||
718e3744 | 2012 | /* Write routing table entry to the stream and return next index of |
2013 | the routing table entry in the stream. */ | |
d62a17ae | 2014 | static int rip_write_rte(int num, struct stream *s, struct prefix_ipv4 *p, |
2015 | u_char version, struct rip_info *rinfo) | |
2016 | { | |
2017 | struct in_addr mask; | |
2018 | ||
2019 | /* Write routing table entry. */ | |
2020 | if (version == RIPv1) { | |
2021 | stream_putw(s, AF_INET); | |
2022 | stream_putw(s, 0); | |
2023 | stream_put_ipv4(s, p->prefix.s_addr); | |
2024 | stream_put_ipv4(s, 0); | |
2025 | stream_put_ipv4(s, 0); | |
2026 | stream_putl(s, rinfo->metric_out); | |
2027 | } else { | |
2028 | masklen2ip(p->prefixlen, &mask); | |
2029 | ||
2030 | stream_putw(s, AF_INET); | |
2031 | stream_putw(s, rinfo->tag_out); | |
2032 | stream_put_ipv4(s, p->prefix.s_addr); | |
2033 | stream_put_ipv4(s, mask.s_addr); | |
2034 | stream_put_ipv4(s, rinfo->nexthop_out.s_addr); | |
2035 | stream_putl(s, rinfo->metric_out); | |
2036 | } | |
2037 | ||
2038 | return ++num; | |
718e3744 | 2039 | } |
2040 | ||
2041 | /* Send update to the ifp or spcified neighbor. */ | |
d62a17ae | 2042 | void rip_output_process(struct connected *ifc, struct sockaddr_in *to, |
2043 | int route_type, u_char version) | |
2044 | { | |
2045 | int ret; | |
2046 | struct stream *s; | |
2047 | struct route_node *rp; | |
2048 | struct rip_info *rinfo; | |
2049 | struct rip_interface *ri; | |
2050 | struct prefix_ipv4 *p; | |
2051 | struct prefix_ipv4 classfull; | |
2052 | struct prefix_ipv4 ifaddrclass; | |
2053 | struct key *key = NULL; | |
2054 | /* this might need to made dynamic if RIP ever supported auth methods | |
2055 | with larger key string sizes */ | |
2056 | char auth_str[RIP_AUTH_SIMPLE_SIZE]; | |
2057 | size_t doff = 0; /* offset of digest offset field */ | |
2058 | int num = 0; | |
2059 | int rtemax; | |
2060 | int subnetted = 0; | |
2061 | struct list *list = NULL; | |
2062 | struct listnode *listnode = NULL; | |
2063 | ||
2064 | /* Logging output event. */ | |
2065 | if (IS_RIP_DEBUG_EVENT) { | |
2066 | if (to) | |
2067 | zlog_debug("update routes to neighbor %s", | |
2068 | inet_ntoa(to->sin_addr)); | |
2069 | else | |
2070 | zlog_debug("update routes on interface %s ifindex %d", | |
2071 | ifc->ifp->name, ifc->ifp->ifindex); | |
2072 | } | |
718e3744 | 2073 | |
d62a17ae | 2074 | /* Set output stream. */ |
2075 | s = rip->obuf; | |
2076 | ||
2077 | /* Reset stream and RTE counter. */ | |
2078 | stream_reset(s); | |
2079 | rtemax = RIP_MAX_RTE; | |
2080 | ||
2081 | /* Get RIP interface. */ | |
2082 | ri = ifc->ifp->info; | |
2083 | ||
2084 | /* If output interface is in simple password authentication mode, we | |
2085 | need space for authentication data. */ | |
2086 | if (ri->auth_type == RIP_AUTH_SIMPLE_PASSWORD) | |
2087 | rtemax -= 1; | |
2088 | ||
2089 | /* If output interface is in MD5 authentication mode, we need space | |
2090 | for authentication header and data. */ | |
2091 | if (ri->auth_type == RIP_AUTH_MD5) | |
2092 | rtemax -= 2; | |
2093 | ||
2094 | /* If output interface is in simple password authentication mode | |
2095 | and string or keychain is specified we need space for auth. data */ | |
2096 | if (ri->auth_type != RIP_NO_AUTH) { | |
2097 | if (ri->key_chain) { | |
2098 | struct keychain *keychain; | |
2099 | ||
2100 | keychain = keychain_lookup(ri->key_chain); | |
2101 | if (keychain) | |
2102 | key = key_lookup_for_send(keychain); | |
2103 | } | |
2104 | /* to be passed to auth functions later */ | |
2105 | rip_auth_prepare_str_send(ri, key, auth_str, | |
2106 | RIP_AUTH_SIMPLE_SIZE); | |
2107 | } | |
2108 | ||
2109 | if (version == RIPv1) { | |
2110 | memcpy(&ifaddrclass, ifc->address, sizeof(struct prefix_ipv4)); | |
2111 | apply_classful_mask_ipv4(&ifaddrclass); | |
2112 | subnetted = 0; | |
2113 | if (ifc->address->prefixlen > ifaddrclass.prefixlen) | |
2114 | subnetted = 1; | |
2115 | } | |
2116 | ||
2117 | for (rp = route_top(rip->table); rp; rp = route_next(rp)) | |
2118 | if ((list = rp->info) != NULL && listcount(list) != 0) { | |
2119 | rinfo = listgetdata(listhead(list)); | |
2120 | /* For RIPv1, if we are subnetted, output subnets in our | |
2121 | * network */ | |
2122 | /* that have the same mask as the output "interface". | |
2123 | * For other */ | |
2124 | /* networks, only the classfull version is output. */ | |
2125 | ||
2126 | if (version == RIPv1) { | |
2127 | p = (struct prefix_ipv4 *)&rp->p; | |
2128 | ||
2129 | if (IS_RIP_DEBUG_PACKET) | |
2130 | zlog_debug( | |
2131 | "RIPv1 mask check, %s/%d considered for output", | |
2132 | inet_ntoa(rp->p.u.prefix4), | |
2133 | rp->p.prefixlen); | |
2134 | ||
2135 | if (subnetted | |
2136 | && prefix_match( | |
2137 | (struct prefix *)&ifaddrclass, | |
2138 | &rp->p)) { | |
2139 | if ((ifc->address->prefixlen | |
2140 | != rp->p.prefixlen) | |
2141 | && (rp->p.prefixlen != 32)) | |
2142 | continue; | |
2143 | } else { | |
2144 | memcpy(&classfull, &rp->p, | |
2145 | sizeof(struct prefix_ipv4)); | |
2146 | apply_classful_mask_ipv4(&classfull); | |
2147 | if (rp->p.u.prefix4.s_addr != 0 | |
2148 | && classfull.prefixlen | |
2149 | != rp->p.prefixlen) | |
2150 | continue; | |
2151 | } | |
2152 | if (IS_RIP_DEBUG_PACKET) | |
2153 | zlog_debug( | |
2154 | "RIPv1 mask check, %s/%d made it through", | |
2155 | inet_ntoa(rp->p.u.prefix4), | |
2156 | rp->p.prefixlen); | |
2157 | } else | |
2158 | p = (struct prefix_ipv4 *)&rp->p; | |
2159 | ||
2160 | /* Apply output filters. */ | |
2161 | ret = rip_filter(RIP_FILTER_OUT, p, ri); | |
2162 | if (ret < 0) | |
2163 | continue; | |
2164 | ||
2165 | /* Changed route only output. */ | |
2166 | if (route_type == rip_changed_route | |
2167 | && (!(rinfo->flags & RIP_RTF_CHANGED))) | |
2168 | continue; | |
2169 | ||
2170 | /* Split horizon. */ | |
2171 | /* if (split_horizon == rip_split_horizon) */ | |
2172 | if (ri->split_horizon == RIP_SPLIT_HORIZON) { | |
2173 | /* | |
2174 | * We perform split horizon for RIP and | |
2175 | * connected route. | |
2176 | * For rip routes, we want to suppress the route | |
2177 | * if we would | |
2178 | * end up sending the route back on the | |
2179 | * interface that we | |
2180 | * learned it from, with a higher metric. For | |
2181 | * connected routes, | |
2182 | * we suppress the route if the prefix is a | |
2183 | * subset of the | |
2184 | * source address that we are going to use for | |
2185 | * the packet | |
2186 | * (in order to handle the case when multiple | |
2187 | * subnets are | |
2188 | * configured on the same interface). | |
2189 | */ | |
2190 | int suppress = 0; | |
2191 | struct rip_info *tmp_rinfo = NULL; | |
2192 | ||
2193 | for (ALL_LIST_ELEMENTS_RO(list, listnode, | |
2194 | tmp_rinfo)) | |
2195 | if (tmp_rinfo->type == ZEBRA_ROUTE_RIP | |
dd127197 | 2196 | && tmp_rinfo->nh.ifindex |
d62a17ae | 2197 | == ifc->ifp->ifindex) { |
2198 | suppress = 1; | |
2199 | break; | |
2200 | } | |
2201 | ||
2202 | if (!suppress | |
2203 | && rinfo->type == ZEBRA_ROUTE_CONNECT | |
2204 | && prefix_match((struct prefix *)p, | |
2205 | ifc->address)) | |
2206 | suppress = 1; | |
2207 | ||
2208 | if (suppress) | |
2209 | continue; | |
2210 | } | |
2211 | ||
2212 | /* Preparation for route-map. */ | |
2213 | rinfo->metric_set = 0; | |
2214 | rinfo->nexthop_out.s_addr = 0; | |
2215 | rinfo->metric_out = rinfo->metric; | |
2216 | rinfo->tag_out = rinfo->tag; | |
2217 | rinfo->ifindex_out = ifc->ifp->ifindex; | |
2218 | ||
2219 | /* In order to avoid some local loops, | |
2220 | * if the RIP route has a nexthop via this interface, | |
2221 | * keep the nexthop, | |
2222 | * otherwise set it to 0. The nexthop should not be | |
2223 | * propagated | |
2224 | * beyond the local broadcast/multicast area in order | |
2225 | * to avoid an IGP multi-level recursive look-up. | |
2226 | * see (4.4) | |
2227 | */ | |
dd127197 DS |
2228 | if (rinfo->nh.ifindex == ifc->ifp->ifindex) |
2229 | rinfo->nexthop_out = rinfo->nh.gate.ipv4; | |
d62a17ae | 2230 | |
2231 | /* Interface route-map */ | |
2232 | if (ri->routemap[RIP_FILTER_OUT]) { | |
2233 | ret = route_map_apply( | |
2234 | ri->routemap[RIP_FILTER_OUT], | |
2235 | (struct prefix *)p, RMAP_RIP, rinfo); | |
2236 | ||
2237 | if (ret == RMAP_DENYMATCH) { | |
2238 | if (IS_RIP_DEBUG_PACKET) | |
2239 | zlog_debug( | |
2240 | "RIP %s/%d is filtered by route-map out", | |
2241 | inet_ntoa(p->prefix), | |
2242 | p->prefixlen); | |
2243 | continue; | |
2244 | } | |
2245 | } | |
2246 | ||
2247 | /* Apply redistribute route map - continue, if deny */ | |
2248 | if (rip->route_map[rinfo->type].name | |
2249 | && rinfo->sub_type != RIP_ROUTE_INTERFACE) { | |
2250 | ret = route_map_apply( | |
2251 | rip->route_map[rinfo->type].map, | |
2252 | (struct prefix *)p, RMAP_RIP, rinfo); | |
2253 | ||
2254 | if (ret == RMAP_DENYMATCH) { | |
2255 | if (IS_RIP_DEBUG_PACKET) | |
2256 | zlog_debug( | |
2257 | "%s/%d is filtered by route-map", | |
2258 | inet_ntoa(p->prefix), | |
2259 | p->prefixlen); | |
2260 | continue; | |
2261 | } | |
2262 | } | |
2263 | ||
2264 | /* When route-map does not set metric. */ | |
2265 | if (!rinfo->metric_set) { | |
2266 | /* If redistribute metric is set. */ | |
2267 | if (rip->route_map[rinfo->type].metric_config | |
2268 | && rinfo->metric != RIP_METRIC_INFINITY) { | |
2269 | rinfo->metric_out = | |
2270 | rip->route_map[rinfo->type] | |
2271 | .metric; | |
2272 | } else { | |
2273 | /* If the route is not connected or | |
2274 | localy generated | |
2275 | one, use default-metric value*/ | |
2276 | if (rinfo->type != ZEBRA_ROUTE_RIP | |
2277 | && rinfo->type | |
2278 | != ZEBRA_ROUTE_CONNECT | |
2279 | && rinfo->metric | |
2280 | != RIP_METRIC_INFINITY) | |
2281 | rinfo->metric_out = | |
2282 | rip->default_metric; | |
2283 | } | |
2284 | } | |
2285 | ||
2286 | /* Apply offset-list */ | |
2287 | if (rinfo->metric != RIP_METRIC_INFINITY) | |
2288 | rip_offset_list_apply_out(p, ifc->ifp, | |
2289 | &rinfo->metric_out); | |
2290 | ||
2291 | if (rinfo->metric_out > RIP_METRIC_INFINITY) | |
2292 | rinfo->metric_out = RIP_METRIC_INFINITY; | |
2293 | ||
2294 | /* Perform split-horizon with poisoned reverse | |
2295 | * for RIP and connected routes. | |
2296 | **/ | |
2297 | if (ri->split_horizon | |
2298 | == RIP_SPLIT_HORIZON_POISONED_REVERSE) { | |
2299 | /* | |
2300 | * We perform split horizon for RIP and | |
2301 | * connected route. | |
2302 | * For rip routes, we want to suppress the route | |
2303 | * if we would | |
2304 | * end up sending the route back on the | |
2305 | * interface that we | |
2306 | * learned it from, with a higher metric. For | |
2307 | * connected routes, | |
2308 | * we suppress the route if the prefix is a | |
2309 | * subset of the | |
2310 | * source address that we are going to use for | |
2311 | * the packet | |
2312 | * (in order to handle the case when multiple | |
2313 | * subnets are | |
2314 | * configured on the same interface). | |
2315 | */ | |
2316 | struct rip_info *tmp_rinfo = NULL; | |
2317 | ||
2318 | for (ALL_LIST_ELEMENTS_RO(list, listnode, | |
2319 | tmp_rinfo)) | |
2320 | if (tmp_rinfo->type == ZEBRA_ROUTE_RIP | |
dd127197 | 2321 | && tmp_rinfo->nh.ifindex |
d62a17ae | 2322 | == ifc->ifp->ifindex) |
2323 | rinfo->metric_out = | |
2324 | RIP_METRIC_INFINITY; | |
2325 | if (tmp_rinfo->type == ZEBRA_ROUTE_CONNECT | |
2326 | && prefix_match((struct prefix *)p, | |
2327 | ifc->address)) | |
2328 | rinfo->metric_out = RIP_METRIC_INFINITY; | |
2329 | } | |
2330 | ||
2331 | /* Prepare preamble, auth headers, if needs be */ | |
2332 | if (num == 0) { | |
2333 | stream_putc(s, RIP_RESPONSE); | |
2334 | stream_putc(s, version); | |
2335 | stream_putw(s, 0); | |
2336 | ||
2337 | /* auth header for !v1 && !no_auth */ | |
2338 | if ((ri->auth_type != RIP_NO_AUTH) | |
2339 | && (version != RIPv1)) | |
2340 | doff = rip_auth_header_write( | |
2341 | s, ri, key, auth_str, | |
2342 | RIP_AUTH_SIMPLE_SIZE); | |
2343 | } | |
2344 | ||
2345 | /* Write RTE to the stream. */ | |
2346 | num = rip_write_rte(num, s, p, version, rinfo); | |
2347 | if (num == rtemax) { | |
2348 | if (version == RIPv2 | |
2349 | && ri->auth_type == RIP_AUTH_MD5) | |
2350 | rip_auth_md5_set(s, ri, doff, auth_str, | |
2351 | RIP_AUTH_SIMPLE_SIZE); | |
2352 | ||
2353 | ret = rip_send_packet(STREAM_DATA(s), | |
2354 | stream_get_endp(s), to, | |
2355 | ifc); | |
2356 | ||
2357 | if (ret >= 0 && IS_RIP_DEBUG_SEND) | |
2358 | rip_packet_dump((struct rip_packet *) | |
2359 | STREAM_DATA(s), | |
2360 | stream_get_endp(s), | |
2361 | "SEND"); | |
2362 | num = 0; | |
2363 | stream_reset(s); | |
2364 | } | |
2365 | } | |
2366 | ||
2367 | /* Flush unwritten RTE. */ | |
2368 | if (num != 0) { | |
2369 | if (version == RIPv2 && ri->auth_type == RIP_AUTH_MD5) | |
2370 | rip_auth_md5_set(s, ri, doff, auth_str, | |
2371 | RIP_AUTH_SIMPLE_SIZE); | |
2372 | ||
2373 | ret = rip_send_packet(STREAM_DATA(s), stream_get_endp(s), to, | |
2374 | ifc); | |
2375 | ||
2376 | if (ret >= 0 && IS_RIP_DEBUG_SEND) | |
2377 | rip_packet_dump((struct rip_packet *)STREAM_DATA(s), | |
2378 | stream_get_endp(s), "SEND"); | |
2379 | stream_reset(s); | |
2380 | } | |
2381 | ||
2382 | /* Statistics updates. */ | |
2383 | ri->sent_updates++; | |
718e3744 | 2384 | } |
2385 | ||
2386 | /* Send RIP packet to the interface. */ | |
d62a17ae | 2387 | static void rip_update_interface(struct connected *ifc, u_char version, |
2388 | int route_type) | |
2389 | { | |
2390 | struct interface *ifp = ifc->ifp; | |
2391 | struct rip_interface *ri = ifp->info; | |
2392 | struct sockaddr_in to; | |
2393 | ||
2394 | /* When RIP version is 2 and multicast enable interface. */ | |
2395 | if (version == RIPv2 && !ri->v2_broadcast && if_is_multicast(ifp)) { | |
2396 | if (IS_RIP_DEBUG_EVENT) | |
2397 | zlog_debug("multicast announce on %s ", ifp->name); | |
2398 | ||
2399 | rip_output_process(ifc, NULL, route_type, version); | |
2400 | return; | |
2401 | } | |
2402 | ||
2403 | /* If we can't send multicast packet, send it with unicast. */ | |
2404 | if (if_is_broadcast(ifp) || if_is_pointopoint(ifp)) { | |
2405 | if (ifc->address->family == AF_INET) { | |
2406 | /* Destination address and port setting. */ | |
2407 | memset(&to, 0, sizeof(struct sockaddr_in)); | |
2408 | if (ifc->destination) | |
2409 | /* use specified broadcast or peer destination | |
2410 | * addr */ | |
2411 | to.sin_addr = ifc->destination->u.prefix4; | |
2412 | else if (ifc->address->prefixlen < IPV4_MAX_PREFIXLEN) | |
2413 | /* calculate the appropriate broadcast address | |
2414 | */ | |
2415 | to.sin_addr.s_addr = ipv4_broadcast_addr( | |
2416 | ifc->address->u.prefix4.s_addr, | |
2417 | ifc->address->prefixlen); | |
2418 | else | |
2419 | /* do not know where to send the packet */ | |
2420 | return; | |
2421 | to.sin_port = htons(RIP_PORT_DEFAULT); | |
2422 | ||
2423 | if (IS_RIP_DEBUG_EVENT) | |
2424 | zlog_debug("%s announce to %s on %s", | |
2425 | CONNECTED_PEER(ifc) ? "unicast" | |
2426 | : "broadcast", | |
2427 | inet_ntoa(to.sin_addr), ifp->name); | |
2428 | ||
2429 | rip_output_process(ifc, &to, route_type, version); | |
2430 | } | |
2431 | } | |
718e3744 | 2432 | } |
2433 | ||
2434 | /* Update send to all interface and neighbor. */ | |
d62a17ae | 2435 | static void rip_update_process(int route_type) |
2436 | { | |
f4e14fdb | 2437 | struct vrf *vrf = vrf_lookup_by_id(VRF_DEFAULT); |
d62a17ae | 2438 | struct listnode *ifnode, *ifnnode; |
2439 | struct connected *connected; | |
2440 | struct interface *ifp; | |
2441 | struct rip_interface *ri; | |
2442 | struct route_node *rp; | |
2443 | struct sockaddr_in to; | |
2444 | struct prefix *p; | |
2445 | ||
2446 | /* Send RIP update to each interface. */ | |
451fda4f | 2447 | FOR_ALL_INTERFACES (vrf, ifp) { |
d62a17ae | 2448 | if (if_is_loopback(ifp)) |
2449 | continue; | |
2450 | ||
2451 | if (!if_is_operative(ifp)) | |
2452 | continue; | |
2453 | ||
2454 | /* Fetch RIP interface information. */ | |
2455 | ri = ifp->info; | |
2456 | ||
2457 | /* When passive interface is specified, suppress announce to the | |
2458 | interface. */ | |
2459 | if (ri->passive) | |
2460 | continue; | |
2461 | ||
2462 | if (ri->running) { | |
2463 | /* | |
2464 | * If there is no version configuration in the | |
2465 | * interface, | |
2466 | * use rip's version setting. | |
2467 | */ | |
2468 | int vsend = ((ri->ri_send == RI_RIP_UNSPEC) | |
2469 | ? rip->version_send | |
2470 | : ri->ri_send); | |
2471 | ||
2472 | if (IS_RIP_DEBUG_EVENT) | |
2473 | zlog_debug("SEND UPDATE to %s ifindex %d", | |
2474 | ifp->name, ifp->ifindex); | |
2475 | ||
2476 | /* send update on each connected network */ | |
2477 | for (ALL_LIST_ELEMENTS(ifp->connected, ifnode, ifnnode, | |
2478 | connected)) { | |
2479 | if (connected->address->family == AF_INET) { | |
2480 | if (vsend & RIPv1) | |
2481 | rip_update_interface( | |
2482 | connected, RIPv1, | |
2483 | route_type); | |
2484 | if ((vsend & RIPv2) | |
2485 | && if_is_multicast(ifp)) | |
2486 | rip_update_interface( | |
2487 | connected, RIPv2, | |
2488 | route_type); | |
2489 | } | |
2490 | } | |
2491 | } | |
2492 | } | |
2493 | ||
2494 | /* RIP send updates to each neighbor. */ | |
2495 | for (rp = route_top(rip->neighbor); rp; rp = route_next(rp)) | |
2496 | if (rp->info != NULL) { | |
2497 | p = &rp->p; | |
2498 | ||
2499 | connected = if_lookup_address(&p->u.prefix4, AF_INET, | |
2500 | VRF_DEFAULT); | |
2501 | if (!connected) { | |
2502 | zlog_warn( | |
2503 | "Neighbor %s doesnt have connected interface!", | |
2504 | inet_ntoa(p->u.prefix4)); | |
2505 | continue; | |
2506 | } | |
2507 | ||
2508 | /* Set destination address and port */ | |
2509 | memset(&to, 0, sizeof(struct sockaddr_in)); | |
2510 | to.sin_addr = p->u.prefix4; | |
2511 | to.sin_port = htons(RIP_PORT_DEFAULT); | |
2512 | ||
2513 | /* RIP version is rip's configuration. */ | |
2514 | rip_output_process(connected, &to, route_type, | |
2515 | rip->version_send); | |
b9d92881 | 2516 | } |
718e3744 | 2517 | } |
2518 | ||
2519 | /* RIP's periodical timer. */ | |
d62a17ae | 2520 | static int rip_update(struct thread *t) |
718e3744 | 2521 | { |
d62a17ae | 2522 | /* Clear timer pointer. */ |
2523 | rip->t_update = NULL; | |
718e3744 | 2524 | |
d62a17ae | 2525 | if (IS_RIP_DEBUG_EVENT) |
2526 | zlog_debug("update timer fire!"); | |
718e3744 | 2527 | |
d62a17ae | 2528 | /* Process update output. */ |
2529 | rip_update_process(rip_all_route); | |
718e3744 | 2530 | |
d62a17ae | 2531 | /* Triggered updates may be suppressed if a regular update is due by |
2532 | the time the triggered update would be sent. */ | |
2533 | RIP_TIMER_OFF(rip->t_triggered_interval); | |
2534 | rip->trigger = 0; | |
718e3744 | 2535 | |
d62a17ae | 2536 | /* Register myself. */ |
2537 | rip_event(RIP_UPDATE_EVENT, 0); | |
718e3744 | 2538 | |
d62a17ae | 2539 | return 0; |
718e3744 | 2540 | } |
2541 | ||
2542 | /* Walk down the RIP routing table then clear changed flag. */ | |
d62a17ae | 2543 | static void rip_clear_changed_flag(void) |
718e3744 | 2544 | { |
d62a17ae | 2545 | struct route_node *rp; |
2546 | struct rip_info *rinfo = NULL; | |
2547 | struct list *list = NULL; | |
2548 | struct listnode *listnode = NULL; | |
718e3744 | 2549 | |
d62a17ae | 2550 | for (rp = route_top(rip->table); rp; rp = route_next(rp)) |
2551 | if ((list = rp->info) != NULL) | |
2552 | for (ALL_LIST_ELEMENTS_RO(list, listnode, rinfo)) { | |
2553 | UNSET_FLAG(rinfo->flags, RIP_RTF_CHANGED); | |
2554 | /* This flag can be set only on the first entry. | |
2555 | */ | |
2556 | break; | |
2557 | } | |
718e3744 | 2558 | } |
2559 | ||
2560 | /* Triggered update interval timer. */ | |
d62a17ae | 2561 | static int rip_triggered_interval(struct thread *t) |
718e3744 | 2562 | { |
d62a17ae | 2563 | int rip_triggered_update(struct thread *); |
718e3744 | 2564 | |
d62a17ae | 2565 | rip->t_triggered_interval = NULL; |
718e3744 | 2566 | |
d62a17ae | 2567 | if (rip->trigger) { |
2568 | rip->trigger = 0; | |
2569 | rip_triggered_update(t); | |
2570 | } | |
2571 | return 0; | |
2572 | } | |
718e3744 | 2573 | |
2574 | /* Execute triggered update. */ | |
d62a17ae | 2575 | static int rip_triggered_update(struct thread *t) |
718e3744 | 2576 | { |
d62a17ae | 2577 | int interval; |
718e3744 | 2578 | |
d62a17ae | 2579 | /* Clear thred pointer. */ |
2580 | rip->t_triggered_update = NULL; | |
718e3744 | 2581 | |
d62a17ae | 2582 | /* Cancel interval timer. */ |
2583 | RIP_TIMER_OFF(rip->t_triggered_interval); | |
2584 | rip->trigger = 0; | |
718e3744 | 2585 | |
d62a17ae | 2586 | /* Logging triggered update. */ |
2587 | if (IS_RIP_DEBUG_EVENT) | |
2588 | zlog_debug("triggered update!"); | |
718e3744 | 2589 | |
d62a17ae | 2590 | /* Split Horizon processing is done when generating triggered |
2591 | updates as well as normal updates (see section 2.6). */ | |
2592 | rip_update_process(rip_changed_route); | |
718e3744 | 2593 | |
d62a17ae | 2594 | /* Once all of the triggered updates have been generated, the route |
2595 | change flags should be cleared. */ | |
2596 | rip_clear_changed_flag(); | |
718e3744 | 2597 | |
d62a17ae | 2598 | /* After a triggered update is sent, a timer should be set for a |
2599 | random interval between 1 and 5 seconds. If other changes that | |
2600 | would trigger updates occur before the timer expires, a single | |
2601 | update is triggered when the timer expires. */ | |
2602 | interval = (random() % 5) + 1; | |
718e3744 | 2603 | |
d62a17ae | 2604 | rip->t_triggered_interval = NULL; |
2605 | thread_add_timer(master, rip_triggered_interval, NULL, interval, | |
2606 | &rip->t_triggered_interval); | |
718e3744 | 2607 | |
d62a17ae | 2608 | return 0; |
718e3744 | 2609 | } |
2610 | ||
2611 | /* Withdraw redistributed route. */ | |
d62a17ae | 2612 | void rip_redistribute_withdraw(int type) |
2613 | { | |
2614 | struct route_node *rp; | |
2615 | struct rip_info *rinfo = NULL; | |
2616 | struct list *list = NULL; | |
2617 | ||
2618 | if (!rip) | |
2619 | return; | |
2620 | ||
2621 | for (rp = route_top(rip->table); rp; rp = route_next(rp)) | |
2622 | if ((list = rp->info) != NULL) { | |
2623 | rinfo = listgetdata(listhead(list)); | |
2624 | if (rinfo->type == type | |
2625 | && rinfo->sub_type != RIP_ROUTE_INTERFACE) { | |
2626 | /* Perform poisoned reverse. */ | |
2627 | rinfo->metric = RIP_METRIC_INFINITY; | |
2628 | RIP_TIMER_ON(rinfo->t_garbage_collect, | |
2629 | rip_garbage_collect, | |
2630 | rip->garbage_time); | |
2631 | RIP_TIMER_OFF(rinfo->t_timeout); | |
2632 | rinfo->flags |= RIP_RTF_CHANGED; | |
2633 | ||
2634 | if (IS_RIP_DEBUG_EVENT) { | |
2635 | struct prefix_ipv4 *p = | |
2636 | (struct prefix_ipv4 *)&rp->p; | |
2637 | ||
2638 | zlog_debug( | |
2639 | "Poisone %s/%d on the interface %s with an infinity metric [withdraw]", | |
2640 | inet_ntoa(p->prefix), | |
2641 | p->prefixlen, | |
dd127197 DS |
2642 | ifindex2ifname( |
2643 | rinfo->nh.ifindex, | |
2644 | VRF_DEFAULT)); | |
d62a17ae | 2645 | } |
2646 | ||
2647 | rip_event(RIP_TRIGGERED_UPDATE, 0); | |
2648 | } | |
2649 | } | |
2650 | } | |
2651 | ||
2652 | /* Create new RIP instance and set it to global variable. */ | |
2653 | static int rip_create(void) | |
718e3744 | 2654 | { |
d62a17ae | 2655 | rip = XCALLOC(MTYPE_RIP, sizeof(struct rip)); |
718e3744 | 2656 | |
d62a17ae | 2657 | /* Set initial value. */ |
2658 | rip->version_send = RI_RIP_VERSION_2; | |
2659 | rip->version_recv = RI_RIP_VERSION_1_AND_2; | |
2660 | rip->update_time = RIP_UPDATE_TIMER_DEFAULT; | |
2661 | rip->timeout_time = RIP_TIMEOUT_TIMER_DEFAULT; | |
2662 | rip->garbage_time = RIP_GARBAGE_TIMER_DEFAULT; | |
2663 | rip->default_metric = RIP_DEFAULT_METRIC_DEFAULT; | |
718e3744 | 2664 | |
d62a17ae | 2665 | /* Initialize RIP routig table. */ |
2666 | rip->table = route_table_init(); | |
2667 | rip->route = route_table_init(); | |
2668 | rip->neighbor = route_table_init(); | |
718e3744 | 2669 | |
d62a17ae | 2670 | /* Make output stream. */ |
2671 | rip->obuf = stream_new(1500); | |
16705130 | 2672 | |
d62a17ae | 2673 | /* Make socket. */ |
2674 | rip->sock = rip_create_socket(); | |
2675 | if (rip->sock < 0) | |
2676 | return rip->sock; | |
16705130 | 2677 | |
d62a17ae | 2678 | /* Create read and timer thread. */ |
2679 | rip_event(RIP_READ, rip->sock); | |
2680 | rip_event(RIP_UPDATE_EVENT, 1); | |
718e3744 | 2681 | |
d62a17ae | 2682 | QOBJ_REG(rip, rip); |
718e3744 | 2683 | |
d62a17ae | 2684 | return 0; |
2685 | } | |
718e3744 | 2686 | |
d62a17ae | 2687 | /* Sned RIP request to the destination. */ |
2688 | int rip_request_send(struct sockaddr_in *to, struct interface *ifp, | |
2689 | u_char version, struct connected *connected) | |
2690 | { | |
2691 | struct rte *rte; | |
2692 | struct rip_packet rip_packet; | |
2693 | struct listnode *node, *nnode; | |
2694 | ||
2695 | memset(&rip_packet, 0, sizeof(rip_packet)); | |
2696 | ||
2697 | rip_packet.command = RIP_REQUEST; | |
2698 | rip_packet.version = version; | |
2699 | rte = rip_packet.rte; | |
2700 | rte->metric = htonl(RIP_METRIC_INFINITY); | |
2701 | ||
2702 | if (connected) { | |
2703 | /* | |
2704 | * connected is only sent for ripv1 case, or when | |
2705 | * interface does not support multicast. Caller loops | |
2706 | * over each connected address for this case. | |
2707 | */ | |
2708 | if (rip_send_packet((u_char *)&rip_packet, sizeof(rip_packet), | |
2709 | to, connected) | |
2710 | != sizeof(rip_packet)) | |
2711 | return -1; | |
2712 | else | |
2713 | return sizeof(rip_packet); | |
2714 | } | |
718e3744 | 2715 | |
d62a17ae | 2716 | /* send request on each connected network */ |
2717 | for (ALL_LIST_ELEMENTS(ifp->connected, node, nnode, connected)) { | |
2718 | struct prefix_ipv4 *p; | |
718e3744 | 2719 | |
d62a17ae | 2720 | p = (struct prefix_ipv4 *)connected->address; |
718e3744 | 2721 | |
d62a17ae | 2722 | if (p->family != AF_INET) |
2723 | continue; | |
f6eacff4 | 2724 | |
d62a17ae | 2725 | if (rip_send_packet((u_char *)&rip_packet, sizeof(rip_packet), |
2726 | to, connected) | |
2727 | != sizeof(rip_packet)) | |
2728 | return -1; | |
2729 | } | |
2730 | return sizeof(rip_packet); | |
718e3744 | 2731 | } |
2732 | ||
d62a17ae | 2733 | static int rip_update_jitter(unsigned long time) |
718e3744 | 2734 | { |
239389ba | 2735 | #define JITTER_BOUND 4 |
d62a17ae | 2736 | /* We want to get the jitter to +/- 1/JITTER_BOUND the interval. |
2737 | Given that, we cannot let time be less than JITTER_BOUND seconds. | |
2738 | The RIPv2 RFC says jitter should be small compared to | |
2739 | update_time. We consider 1/JITTER_BOUND to be small. | |
2740 | */ | |
2741 | ||
2742 | int jitter_input = time; | |
2743 | int jitter; | |
2744 | ||
2745 | if (jitter_input < JITTER_BOUND) | |
2746 | jitter_input = JITTER_BOUND; | |
2747 | ||
2748 | jitter = (((random() % ((jitter_input * 2) + 1)) - jitter_input)); | |
2749 | ||
2750 | return jitter / JITTER_BOUND; | |
2751 | } | |
2752 | ||
2753 | void rip_event(enum rip_event event, int sock) | |
2754 | { | |
2755 | int jitter = 0; | |
2756 | ||
2757 | switch (event) { | |
2758 | case RIP_READ: | |
2759 | rip->t_read = NULL; | |
2760 | thread_add_read(master, rip_read, NULL, sock, &rip->t_read); | |
2761 | break; | |
2762 | case RIP_UPDATE_EVENT: | |
2763 | RIP_TIMER_OFF(rip->t_update); | |
2764 | jitter = rip_update_jitter(rip->update_time); | |
2765 | thread_add_timer(master, rip_update, NULL, | |
2766 | sock ? 2 : rip->update_time + jitter, | |
2767 | &rip->t_update); | |
2768 | break; | |
2769 | case RIP_TRIGGERED_UPDATE: | |
2770 | if (rip->t_triggered_interval) | |
2771 | rip->trigger = 1; | |
2772 | else | |
2773 | thread_add_event(master, rip_triggered_update, NULL, 0, | |
2774 | &rip->t_triggered_update); | |
2775 | break; | |
2776 | default: | |
2777 | break; | |
2778 | } | |
718e3744 | 2779 | } |
6b0655a2 | 2780 | |
505e5056 | 2781 | DEFUN_NOSH (router_rip, |
718e3744 | 2782 | router_rip_cmd, |
2783 | "router rip", | |
2784 | "Enable a routing process\n" | |
2785 | "Routing Information Protocol (RIP)\n") | |
2786 | { | |
d62a17ae | 2787 | int ret; |
718e3744 | 2788 | |
d62a17ae | 2789 | /* If rip is not enabled before. */ |
2790 | if (!rip) { | |
2791 | ret = rip_create(); | |
2792 | if (ret < 0) { | |
2793 | zlog_info("Can't create RIP"); | |
2794 | return CMD_WARNING_CONFIG_FAILED; | |
2795 | } | |
718e3744 | 2796 | } |
d62a17ae | 2797 | VTY_PUSH_CONTEXT(RIP_NODE, rip); |
718e3744 | 2798 | |
d62a17ae | 2799 | return CMD_SUCCESS; |
718e3744 | 2800 | } |
2801 | ||
2802 | DEFUN (no_router_rip, | |
2803 | no_router_rip_cmd, | |
2804 | "no router rip", | |
2805 | NO_STR | |
2806 | "Enable a routing process\n" | |
2807 | "Routing Information Protocol (RIP)\n") | |
2808 | { | |
d62a17ae | 2809 | if (rip) |
2810 | rip_clean(); | |
2811 | return CMD_SUCCESS; | |
718e3744 | 2812 | } |
2813 | ||
2814 | DEFUN (rip_version, | |
2815 | rip_version_cmd, | |
6147e2c6 | 2816 | "version (1-2)", |
718e3744 | 2817 | "Set routing protocol version\n" |
2818 | "version\n") | |
2819 | { | |
d62a17ae | 2820 | int idx_number = 1; |
2821 | int version; | |
718e3744 | 2822 | |
d62a17ae | 2823 | version = atoi(argv[idx_number]->arg); |
2824 | if (version != RIPv1 && version != RIPv2) { | |
2825 | vty_out(vty, "invalid rip version %d\n", version); | |
2826 | return CMD_WARNING_CONFIG_FAILED; | |
2827 | } | |
2828 | rip->version_send = version; | |
2829 | rip->version_recv = version; | |
718e3744 | 2830 | |
d62a17ae | 2831 | return CMD_SUCCESS; |
80fa0c69 | 2832 | } |
718e3744 | 2833 | |
2834 | DEFUN (no_rip_version, | |
2835 | no_rip_version_cmd, | |
55c727dd | 2836 | "no version [(1-2)]", |
718e3744 | 2837 | NO_STR |
55c727dd QY |
2838 | "Set routing protocol version\n" |
2839 | "Version\n") | |
718e3744 | 2840 | { |
d62a17ae | 2841 | /* Set RIP version to the default. */ |
2842 | rip->version_send = RI_RIP_VERSION_2; | |
2843 | rip->version_recv = RI_RIP_VERSION_1_AND_2; | |
718e3744 | 2844 | |
d62a17ae | 2845 | return CMD_SUCCESS; |
80fa0c69 | 2846 | } |
718e3744 | 2847 | |
718e3744 | 2848 | |
2849 | DEFUN (rip_route, | |
2850 | rip_route_cmd, | |
2851 | "route A.B.C.D/M", | |
2852 | "RIP static route configuration\n" | |
2853 | "IP prefix <network>/<length>\n") | |
2854 | { | |
d62a17ae | 2855 | int idx_ipv4_prefixlen = 1; |
2856 | int ret; | |
3f5682c8 | 2857 | struct nexthop nh; |
d62a17ae | 2858 | struct prefix_ipv4 p; |
2859 | struct route_node *node; | |
718e3744 | 2860 | |
3f5682c8 DS |
2861 | memset(&nh, 0, sizeof(nh)); |
2862 | nh.type = NEXTHOP_TYPE_IPV4; | |
2863 | ||
d62a17ae | 2864 | ret = str2prefix_ipv4(argv[idx_ipv4_prefixlen]->arg, &p); |
2865 | if (ret < 0) { | |
2866 | vty_out(vty, "Malformed address\n"); | |
2867 | return CMD_WARNING_CONFIG_FAILED; | |
2868 | } | |
2869 | apply_mask_ipv4(&p); | |
718e3744 | 2870 | |
d62a17ae | 2871 | /* For router rip configuration. */ |
2872 | node = route_node_get(rip->route, (struct prefix *)&p); | |
718e3744 | 2873 | |
d62a17ae | 2874 | if (node->info) { |
2875 | vty_out(vty, "There is already same static route.\n"); | |
2876 | route_unlock_node(node); | |
851fcbae | 2877 | return CMD_WARNING; |
d62a17ae | 2878 | } |
718e3744 | 2879 | |
d62a17ae | 2880 | node->info = (void *)1; |
718e3744 | 2881 | |
3f5682c8 | 2882 | rip_redistribute_add(ZEBRA_ROUTE_RIP, RIP_ROUTE_STATIC, &p, &nh, 0, |
d62a17ae | 2883 | 0, 0); |
718e3744 | 2884 | |
d62a17ae | 2885 | return CMD_SUCCESS; |
718e3744 | 2886 | } |
2887 | ||
2888 | DEFUN (no_rip_route, | |
2889 | no_rip_route_cmd, | |
2890 | "no route A.B.C.D/M", | |
2891 | NO_STR | |
2892 | "RIP static route configuration\n" | |
2893 | "IP prefix <network>/<length>\n") | |
2894 | { | |
d62a17ae | 2895 | int idx_ipv4_prefixlen = 2; |
2896 | int ret; | |
2897 | struct prefix_ipv4 p; | |
2898 | struct route_node *node; | |
718e3744 | 2899 | |
d62a17ae | 2900 | ret = str2prefix_ipv4(argv[idx_ipv4_prefixlen]->arg, &p); |
2901 | if (ret < 0) { | |
2902 | vty_out(vty, "Malformed address\n"); | |
2903 | return CMD_WARNING_CONFIG_FAILED; | |
2904 | } | |
2905 | apply_mask_ipv4(&p); | |
2906 | ||
2907 | /* For router rip configuration. */ | |
2908 | node = route_node_lookup(rip->route, (struct prefix *)&p); | |
2909 | if (!node) { | |
2910 | vty_out(vty, "Can't find route %s.\n", | |
2911 | argv[idx_ipv4_prefixlen]->arg); | |
2912 | return CMD_WARNING_CONFIG_FAILED; | |
2913 | } | |
718e3744 | 2914 | |
d62a17ae | 2915 | rip_redistribute_delete(ZEBRA_ROUTE_RIP, RIP_ROUTE_STATIC, &p, 0); |
2916 | route_unlock_node(node); | |
718e3744 | 2917 | |
d62a17ae | 2918 | node->info = NULL; |
2919 | route_unlock_node(node); | |
718e3744 | 2920 | |
d62a17ae | 2921 | return CMD_SUCCESS; |
718e3744 | 2922 | } |
2923 | ||
2c239705 | 2924 | #if 0 |
dc63bfd4 | 2925 | static void |
216565ab | 2926 | rip_update_default_metric (void) |
718e3744 | 2927 | { |
2928 | struct route_node *np; | |
bce8e868 LF |
2929 | struct rip_info *rinfo = NULL; |
2930 | struct list *list = NULL; | |
2931 | struct listnode *listnode = NULL; | |
718e3744 | 2932 | |
2933 | for (np = route_top (rip->table); np; np = route_next (np)) | |
bce8e868 LF |
2934 | if ((list = np->info) != NULL) |
2935 | for (ALL_LIST_ELEMENTS_RO (list, listnode, rinfo)) | |
2936 | if (rinfo->type != ZEBRA_ROUTE_RIP && rinfo->type != ZEBRA_ROUTE_CONNECT) | |
2937 | rinfo->metric = rip->default_metric; | |
718e3744 | 2938 | } |
2c239705 | 2939 | #endif |
718e3744 | 2940 | |
2941 | DEFUN (rip_default_metric, | |
2942 | rip_default_metric_cmd, | |
6147e2c6 | 2943 | "default-metric (1-16)", |
718e3744 | 2944 | "Set a metric of redistribute routes\n" |
2945 | "Default metric\n") | |
2946 | { | |
d62a17ae | 2947 | int idx_number = 1; |
2948 | if (rip) { | |
2949 | rip->default_metric = atoi(argv[idx_number]->arg); | |
2950 | /* rip_update_default_metric (); */ | |
2951 | } | |
2952 | return CMD_SUCCESS; | |
718e3744 | 2953 | } |
2954 | ||
2955 | DEFUN (no_rip_default_metric, | |
2956 | no_rip_default_metric_cmd, | |
55c727dd | 2957 | "no default-metric [(1-16)]", |
718e3744 | 2958 | NO_STR |
2959 | "Set a metric of redistribute routes\n" | |
2960 | "Default metric\n") | |
2961 | { | |
d62a17ae | 2962 | if (rip) { |
2963 | rip->default_metric = RIP_DEFAULT_METRIC_DEFAULT; | |
2964 | /* rip_update_default_metric (); */ | |
2965 | } | |
2966 | return CMD_SUCCESS; | |
718e3744 | 2967 | } |
2968 | ||
718e3744 | 2969 | |
2970 | DEFUN (rip_timers, | |
2971 | rip_timers_cmd, | |
6147e2c6 | 2972 | "timers basic (5-2147483647) (5-2147483647) (5-2147483647)", |
718e3744 | 2973 | "Adjust routing timers\n" |
2974 | "Basic routing protocol update timers\n" | |
2975 | "Routing table update timer value in second. Default is 30.\n" | |
2976 | "Routing information timeout timer. Default is 180.\n" | |
2977 | "Garbage collection timer. Default is 120.\n") | |
2978 | { | |
d62a17ae | 2979 | int idx_number = 2; |
2980 | int idx_number_2 = 3; | |
2981 | int idx_number_3 = 4; | |
2982 | unsigned long update; | |
2983 | unsigned long timeout; | |
2984 | unsigned long garbage; | |
2985 | char *endptr = NULL; | |
2986 | unsigned long RIP_TIMER_MAX = 2147483647; | |
2987 | unsigned long RIP_TIMER_MIN = 5; | |
2988 | ||
2989 | update = strtoul(argv[idx_number]->arg, &endptr, 10); | |
2990 | if (update > RIP_TIMER_MAX || update < RIP_TIMER_MIN | |
2991 | || *endptr != '\0') { | |
2992 | vty_out(vty, "update timer value error\n"); | |
2993 | return CMD_WARNING_CONFIG_FAILED; | |
2994 | } | |
2995 | ||
2996 | timeout = strtoul(argv[idx_number_2]->arg, &endptr, 10); | |
2997 | if (timeout > RIP_TIMER_MAX || timeout < RIP_TIMER_MIN | |
2998 | || *endptr != '\0') { | |
2999 | vty_out(vty, "timeout timer value error\n"); | |
3000 | return CMD_WARNING_CONFIG_FAILED; | |
3001 | } | |
3002 | ||
3003 | garbage = strtoul(argv[idx_number_3]->arg, &endptr, 10); | |
3004 | if (garbage > RIP_TIMER_MAX || garbage < RIP_TIMER_MIN | |
3005 | || *endptr != '\0') { | |
3006 | vty_out(vty, "garbage timer value error\n"); | |
3007 | return CMD_WARNING_CONFIG_FAILED; | |
3008 | } | |
3009 | ||
3010 | /* Set each timer value. */ | |
3011 | rip->update_time = update; | |
3012 | rip->timeout_time = timeout; | |
3013 | rip->garbage_time = garbage; | |
3014 | ||
3015 | /* Reset update timer thread. */ | |
3016 | rip_event(RIP_UPDATE_EVENT, 0); | |
3017 | ||
3018 | return CMD_SUCCESS; | |
718e3744 | 3019 | } |
3020 | ||
3021 | DEFUN (no_rip_timers, | |
3022 | no_rip_timers_cmd, | |
55c727dd | 3023 | "no timers basic [(0-65535) (0-65535) (0-65535)]", |
718e3744 | 3024 | NO_STR |
3025 | "Adjust routing timers\n" | |
55c727dd QY |
3026 | "Basic routing protocol update timers\n" |
3027 | "Routing table update timer value in second. Default is 30.\n" | |
3028 | "Routing information timeout timer. Default is 180.\n" | |
3029 | "Garbage collection timer. Default is 120.\n") | |
718e3744 | 3030 | { |
d62a17ae | 3031 | /* Set each timer value to the default. */ |
3032 | rip->update_time = RIP_UPDATE_TIMER_DEFAULT; | |
3033 | rip->timeout_time = RIP_TIMEOUT_TIMER_DEFAULT; | |
3034 | rip->garbage_time = RIP_GARBAGE_TIMER_DEFAULT; | |
718e3744 | 3035 | |
d62a17ae | 3036 | /* Reset update timer thread. */ |
3037 | rip_event(RIP_UPDATE_EVENT, 0); | |
718e3744 | 3038 | |
d62a17ae | 3039 | return CMD_SUCCESS; |
718e3744 | 3040 | } |
16705130 | 3041 | |
16705130 | 3042 | |
718e3744 | 3043 | struct route_table *rip_distance_table; |
3044 | ||
d62a17ae | 3045 | struct rip_distance { |
3046 | /* Distance value for the IP source prefix. */ | |
3047 | u_char distance; | |
718e3744 | 3048 | |
d62a17ae | 3049 | /* Name of the access-list to be matched. */ |
3050 | char *access_list; | |
718e3744 | 3051 | }; |
3052 | ||
d62a17ae | 3053 | static struct rip_distance *rip_distance_new(void) |
718e3744 | 3054 | { |
d62a17ae | 3055 | return XCALLOC(MTYPE_RIP_DISTANCE, sizeof(struct rip_distance)); |
718e3744 | 3056 | } |
3057 | ||
d62a17ae | 3058 | static void rip_distance_free(struct rip_distance *rdistance) |
3059 | { | |
3060 | XFREE(MTYPE_RIP_DISTANCE, rdistance); | |
718e3744 | 3061 | } |
3062 | ||
d62a17ae | 3063 | static int rip_distance_set(struct vty *vty, const char *distance_str, |
3064 | const char *ip_str, const char *access_list_str) | |
718e3744 | 3065 | { |
d62a17ae | 3066 | int ret; |
3067 | struct prefix_ipv4 p; | |
3068 | u_char distance; | |
3069 | struct route_node *rn; | |
3070 | struct rip_distance *rdistance; | |
3071 | ||
3072 | ret = str2prefix_ipv4(ip_str, &p); | |
3073 | if (ret == 0) { | |
3074 | vty_out(vty, "Malformed prefix\n"); | |
3075 | return CMD_WARNING_CONFIG_FAILED; | |
3076 | } | |
3077 | ||
3078 | distance = atoi(distance_str); | |
3079 | ||
3080 | /* Get RIP distance node. */ | |
3081 | rn = route_node_get(rip_distance_table, (struct prefix *)&p); | |
3082 | if (rn->info) { | |
3083 | rdistance = rn->info; | |
3084 | route_unlock_node(rn); | |
3085 | } else { | |
3086 | rdistance = rip_distance_new(); | |
3087 | rn->info = rdistance; | |
3088 | } | |
3089 | ||
3090 | /* Set distance value. */ | |
3091 | rdistance->distance = distance; | |
3092 | ||
3093 | /* Reset access-list configuration. */ | |
3094 | if (rdistance->access_list) { | |
3095 | free(rdistance->access_list); | |
3096 | rdistance->access_list = NULL; | |
3097 | } | |
3098 | if (access_list_str) | |
3099 | rdistance->access_list = strdup(access_list_str); | |
3100 | ||
3101 | return CMD_SUCCESS; | |
3102 | } | |
3103 | ||
3104 | static int rip_distance_unset(struct vty *vty, const char *distance_str, | |
3105 | const char *ip_str, const char *access_list_str) | |
3106 | { | |
3107 | int ret; | |
3108 | struct prefix_ipv4 p; | |
3109 | struct route_node *rn; | |
3110 | struct rip_distance *rdistance; | |
3111 | ||
3112 | ret = str2prefix_ipv4(ip_str, &p); | |
3113 | if (ret == 0) { | |
3114 | vty_out(vty, "Malformed prefix\n"); | |
3115 | return CMD_WARNING_CONFIG_FAILED; | |
3116 | } | |
3117 | ||
3118 | rn = route_node_lookup(rip_distance_table, (struct prefix *)&p); | |
3119 | if (!rn) { | |
3120 | vty_out(vty, "Can't find specified prefix\n"); | |
3121 | return CMD_WARNING_CONFIG_FAILED; | |
3122 | } | |
3123 | ||
3124 | rdistance = rn->info; | |
718e3744 | 3125 | |
718e3744 | 3126 | if (rdistance->access_list) |
d62a17ae | 3127 | free(rdistance->access_list); |
3128 | rip_distance_free(rdistance); | |
3129 | ||
718e3744 | 3130 | rn->info = NULL; |
d62a17ae | 3131 | route_unlock_node(rn); |
3132 | route_unlock_node(rn); | |
3133 | ||
3134 | return CMD_SUCCESS; | |
718e3744 | 3135 | } |
3136 | ||
d62a17ae | 3137 | static void rip_distance_reset(void) |
3138 | { | |
3139 | struct route_node *rn; | |
3140 | struct rip_distance *rdistance; | |
718e3744 | 3141 | |
d62a17ae | 3142 | for (rn = route_top(rip_distance_table); rn; rn = route_next(rn)) |
3143 | if ((rdistance = rn->info) != NULL) { | |
3144 | if (rdistance->access_list) | |
3145 | free(rdistance->access_list); | |
3146 | rip_distance_free(rdistance); | |
3147 | rn->info = NULL; | |
3148 | route_unlock_node(rn); | |
3149 | } | |
3150 | } | |
3151 | ||
3152 | /* Apply RIP information to distance method. */ | |
3153 | u_char rip_distance_apply(struct rip_info *rinfo) | |
3154 | { | |
3155 | struct route_node *rn; | |
3156 | struct prefix_ipv4 p; | |
3157 | struct rip_distance *rdistance; | |
3158 | struct access_list *alist; | |
3159 | ||
3160 | if (!rip) | |
3161 | return 0; | |
3162 | ||
3163 | memset(&p, 0, sizeof(struct prefix_ipv4)); | |
3164 | p.family = AF_INET; | |
3165 | p.prefix = rinfo->from; | |
3166 | p.prefixlen = IPV4_MAX_BITLEN; | |
3167 | ||
3168 | /* Check source address. */ | |
3169 | rn = route_node_match(rip_distance_table, (struct prefix *)&p); | |
3170 | if (rn) { | |
3171 | rdistance = rn->info; | |
3172 | route_unlock_node(rn); | |
3173 | ||
3174 | if (rdistance->access_list) { | |
3175 | alist = access_list_lookup(AFI_IP, | |
3176 | rdistance->access_list); | |
3177 | if (alist == NULL) | |
3178 | return 0; | |
3179 | if (access_list_apply(alist, &rinfo->rp->p) | |
3180 | == FILTER_DENY) | |
3181 | return 0; | |
3182 | ||
3183 | return rdistance->distance; | |
3184 | } else | |
3185 | return rdistance->distance; | |
718e3744 | 3186 | } |
718e3744 | 3187 | |
d62a17ae | 3188 | if (rip->distance) |
3189 | return rip->distance; | |
718e3744 | 3190 | |
d62a17ae | 3191 | return 0; |
718e3744 | 3192 | } |
3193 | ||
d62a17ae | 3194 | static void rip_distance_show(struct vty *vty) |
3195 | { | |
3196 | struct route_node *rn; | |
3197 | struct rip_distance *rdistance; | |
3198 | int header = 1; | |
3199 | char buf[BUFSIZ]; | |
3200 | ||
3201 | vty_out(vty, " Distance: (default is %d)\n", | |
3202 | rip->distance ? rip->distance : ZEBRA_RIP_DISTANCE_DEFAULT); | |
3203 | ||
3204 | for (rn = route_top(rip_distance_table); rn; rn = route_next(rn)) | |
3205 | if ((rdistance = rn->info) != NULL) { | |
3206 | if (header) { | |
3207 | vty_out(vty, | |
3208 | " Address Distance List\n"); | |
3209 | header = 0; | |
3210 | } | |
3211 | sprintf(buf, "%s/%d", inet_ntoa(rn->p.u.prefix4), | |
3212 | rn->p.prefixlen); | |
3213 | vty_out(vty, " %-20s %4d %s\n", buf, | |
3214 | rdistance->distance, | |
3215 | rdistance->access_list ? rdistance->access_list | |
3216 | : ""); | |
3217 | } | |
718e3744 | 3218 | } |
3219 | ||
3220 | DEFUN (rip_distance, | |
3221 | rip_distance_cmd, | |
6147e2c6 | 3222 | "distance (1-255)", |
718e3744 | 3223 | "Administrative distance\n" |
3224 | "Distance value\n") | |
3225 | { | |
d62a17ae | 3226 | int idx_number = 1; |
3227 | rip->distance = atoi(argv[idx_number]->arg); | |
3228 | return CMD_SUCCESS; | |
718e3744 | 3229 | } |
3230 | ||
3231 | DEFUN (no_rip_distance, | |
3232 | no_rip_distance_cmd, | |
6147e2c6 | 3233 | "no distance (1-255)", |
718e3744 | 3234 | NO_STR |
3235 | "Administrative distance\n" | |
3236 | "Distance value\n") | |
3237 | { | |
d62a17ae | 3238 | rip->distance = 0; |
3239 | return CMD_SUCCESS; | |
718e3744 | 3240 | } |
3241 | ||
3242 | DEFUN (rip_distance_source, | |
3243 | rip_distance_source_cmd, | |
6147e2c6 | 3244 | "distance (1-255) A.B.C.D/M", |
718e3744 | 3245 | "Administrative distance\n" |
3246 | "Distance value\n" | |
3247 | "IP source prefix\n") | |
3248 | { | |
d62a17ae | 3249 | int idx_number = 1; |
3250 | int idx_ipv4_prefixlen = 2; | |
3251 | rip_distance_set(vty, argv[idx_number]->arg, | |
3252 | argv[idx_ipv4_prefixlen]->arg, NULL); | |
3253 | return CMD_SUCCESS; | |
718e3744 | 3254 | } |
3255 | ||
3256 | DEFUN (no_rip_distance_source, | |
3257 | no_rip_distance_source_cmd, | |
6147e2c6 | 3258 | "no distance (1-255) A.B.C.D/M", |
718e3744 | 3259 | NO_STR |
3260 | "Administrative distance\n" | |
3261 | "Distance value\n" | |
3262 | "IP source prefix\n") | |
3263 | { | |
d62a17ae | 3264 | int idx_number = 2; |
3265 | int idx_ipv4_prefixlen = 3; | |
3266 | rip_distance_unset(vty, argv[idx_number]->arg, | |
3267 | argv[idx_ipv4_prefixlen]->arg, NULL); | |
3268 | return CMD_SUCCESS; | |
718e3744 | 3269 | } |
3270 | ||
3271 | DEFUN (rip_distance_source_access_list, | |
3272 | rip_distance_source_access_list_cmd, | |
6147e2c6 | 3273 | "distance (1-255) A.B.C.D/M WORD", |
718e3744 | 3274 | "Administrative distance\n" |
3275 | "Distance value\n" | |
3276 | "IP source prefix\n" | |
3277 | "Access list name\n") | |
3278 | { | |
d62a17ae | 3279 | int idx_number = 1; |
3280 | int idx_ipv4_prefixlen = 2; | |
3281 | int idx_word = 3; | |
3282 | rip_distance_set(vty, argv[idx_number]->arg, | |
3283 | argv[idx_ipv4_prefixlen]->arg, argv[idx_word]->arg); | |
3284 | return CMD_SUCCESS; | |
718e3744 | 3285 | } |
3286 | ||
3287 | DEFUN (no_rip_distance_source_access_list, | |
3288 | no_rip_distance_source_access_list_cmd, | |
6147e2c6 | 3289 | "no distance (1-255) A.B.C.D/M WORD", |
718e3744 | 3290 | NO_STR |
3291 | "Administrative distance\n" | |
3292 | "Distance value\n" | |
3293 | "IP source prefix\n" | |
3294 | "Access list name\n") | |
3295 | { | |
d62a17ae | 3296 | int idx_number = 2; |
3297 | int idx_ipv4_prefixlen = 3; | |
3298 | int idx_word = 4; | |
3299 | rip_distance_unset(vty, argv[idx_number]->arg, | |
3300 | argv[idx_ipv4_prefixlen]->arg, argv[idx_word]->arg); | |
3301 | return CMD_SUCCESS; | |
718e3744 | 3302 | } |
6b0655a2 | 3303 | |
8478ae7e | 3304 | /* Update ECMP routes to zebra when ECMP is disabled. */ |
d62a17ae | 3305 | static void rip_ecmp_disable(void) |
3306 | { | |
3307 | struct route_node *rp; | |
3308 | struct rip_info *rinfo, *tmp_rinfo; | |
3309 | struct list *list; | |
3310 | struct listnode *node, *nextnode; | |
3311 | ||
3312 | if (!rip) | |
3313 | return; | |
3314 | ||
3315 | for (rp = route_top(rip->table); rp; rp = route_next(rp)) | |
3316 | if ((list = rp->info) != NULL && listcount(list) > 1) { | |
3317 | rinfo = listgetdata(listhead(list)); | |
3318 | if (!rip_route_rte(rinfo)) | |
3319 | continue; | |
3320 | ||
3321 | /* Drop all other entries, except the first one. */ | |
3322 | for (ALL_LIST_ELEMENTS(list, node, nextnode, tmp_rinfo)) | |
3323 | if (tmp_rinfo != rinfo) { | |
3324 | RIP_TIMER_OFF(tmp_rinfo->t_timeout); | |
3325 | RIP_TIMER_OFF( | |
3326 | tmp_rinfo->t_garbage_collect); | |
3327 | list_delete_node(list, node); | |
3328 | rip_info_free(tmp_rinfo); | |
3329 | } | |
3330 | ||
3331 | /* Update zebra. */ | |
3332 | rip_zebra_ipv4_add(rp); | |
3333 | ||
3334 | /* Set the route change flag. */ | |
3335 | SET_FLAG(rinfo->flags, RIP_RTF_CHANGED); | |
3336 | ||
3337 | /* Signal the output process to trigger an update. */ | |
3338 | rip_event(RIP_TRIGGERED_UPDATE, 0); | |
3339 | } | |
8478ae7e LF |
3340 | } |
3341 | ||
3342 | DEFUN (rip_allow_ecmp, | |
3343 | rip_allow_ecmp_cmd, | |
3344 | "allow-ecmp", | |
3345 | "Allow Equal Cost MultiPath\n") | |
3346 | { | |
d62a17ae | 3347 | if (rip->ecmp) { |
3348 | vty_out(vty, "ECMP is already enabled.\n"); | |
851fcbae | 3349 | return CMD_WARNING; |
d62a17ae | 3350 | } |
8478ae7e | 3351 | |
d62a17ae | 3352 | rip->ecmp = 1; |
3353 | zlog_info("ECMP is enabled."); | |
3354 | return CMD_SUCCESS; | |
8478ae7e LF |
3355 | } |
3356 | ||
3357 | DEFUN (no_rip_allow_ecmp, | |
3358 | no_rip_allow_ecmp_cmd, | |
3359 | "no allow-ecmp", | |
3360 | NO_STR | |
3361 | "Allow Equal Cost MultiPath\n") | |
3362 | { | |
d62a17ae | 3363 | if (!rip->ecmp) { |
3364 | vty_out(vty, "ECMP is already disabled.\n"); | |
851fcbae | 3365 | return CMD_WARNING; |
d62a17ae | 3366 | } |
8478ae7e | 3367 | |
d62a17ae | 3368 | rip->ecmp = 0; |
3369 | zlog_info("ECMP is disabled."); | |
3370 | rip_ecmp_disable(); | |
3371 | return CMD_SUCCESS; | |
8478ae7e LF |
3372 | } |
3373 | ||
718e3744 | 3374 | /* Print out routes update time. */ |
d62a17ae | 3375 | static void rip_vty_out_uptime(struct vty *vty, struct rip_info *rinfo) |
718e3744 | 3376 | { |
d62a17ae | 3377 | time_t clock; |
3378 | struct tm *tm; | |
718e3744 | 3379 | #define TIME_BUF 25 |
d62a17ae | 3380 | char timebuf[TIME_BUF]; |
3381 | struct thread *thread; | |
3382 | ||
3383 | if ((thread = rinfo->t_timeout) != NULL) { | |
3384 | clock = thread_timer_remain_second(thread); | |
3385 | tm = gmtime(&clock); | |
3386 | strftime(timebuf, TIME_BUF, "%M:%S", tm); | |
3387 | vty_out(vty, "%5s", timebuf); | |
3388 | } else if ((thread = rinfo->t_garbage_collect) != NULL) { | |
3389 | clock = thread_timer_remain_second(thread); | |
3390 | tm = gmtime(&clock); | |
3391 | strftime(timebuf, TIME_BUF, "%M:%S", tm); | |
3392 | vty_out(vty, "%5s", timebuf); | |
3393 | } | |
3394 | } | |
3395 | ||
3396 | static const char *rip_route_type_print(int sub_type) | |
3397 | { | |
3398 | switch (sub_type) { | |
3399 | case RIP_ROUTE_RTE: | |
3400 | return "n"; | |
3401 | case RIP_ROUTE_STATIC: | |
3402 | return "s"; | |
3403 | case RIP_ROUTE_DEFAULT: | |
3404 | return "d"; | |
3405 | case RIP_ROUTE_REDISTRIBUTE: | |
3406 | return "r"; | |
3407 | case RIP_ROUTE_INTERFACE: | |
3408 | return "i"; | |
3409 | default: | |
3410 | return "?"; | |
3411 | } | |
718e3744 | 3412 | } |
3413 | ||
3414 | DEFUN (show_ip_rip, | |
3415 | show_ip_rip_cmd, | |
3416 | "show ip rip", | |
3417 | SHOW_STR | |
3418 | IP_STR | |
3419 | "Show RIP routes\n") | |
3420 | { | |
d62a17ae | 3421 | struct route_node *np; |
3422 | struct rip_info *rinfo = NULL; | |
3423 | struct list *list = NULL; | |
3424 | struct listnode *listnode = NULL; | |
3425 | ||
3426 | if (!rip) | |
3427 | return CMD_SUCCESS; | |
3428 | ||
3429 | vty_out(vty, | |
3430 | "Codes: R - RIP, C - connected, S - Static, O - OSPF, B - BGP\n" | |
3431 | "Sub-codes:\n" | |
3432 | " (n) - normal, (s) - static, (d) - default, (r) - redistribute,\n" | |
3433 | " (i) - interface\n\n" | |
3434 | " Network Next Hop Metric From Tag Time\n"); | |
3435 | ||
3436 | for (np = route_top(rip->table); np; np = route_next(np)) | |
3437 | if ((list = np->info) != NULL) | |
3438 | for (ALL_LIST_ELEMENTS_RO(list, listnode, rinfo)) { | |
3439 | int len; | |
3440 | ||
3441 | len = vty_out( | |
3442 | vty, "%c(%s) %s/%d", | |
3443 | /* np->lock, For debugging. */ | |
3444 | zebra_route_char(rinfo->type), | |
3445 | rip_route_type_print(rinfo->sub_type), | |
3446 | inet_ntoa(np->p.u.prefix4), | |
3447 | np->p.prefixlen); | |
3448 | ||
3449 | len = 24 - len; | |
3450 | ||
3451 | if (len > 0) | |
3452 | vty_out(vty, "%*s", len, " "); | |
3453 | ||
3f5682c8 DS |
3454 | switch(rinfo->nh.type) { |
3455 | case NEXTHOP_TYPE_IPV4: | |
3456 | case NEXTHOP_TYPE_IPV4_IFINDEX: | |
d62a17ae | 3457 | vty_out(vty, "%-20s %2d ", |
dd127197 | 3458 | inet_ntoa(rinfo->nh.gate.ipv4), |
d62a17ae | 3459 | rinfo->metric); |
3f5682c8 DS |
3460 | break; |
3461 | case NEXTHOP_TYPE_IFINDEX: | |
d62a17ae | 3462 | vty_out(vty, |
3463 | "0.0.0.0 %2d ", | |
3464 | rinfo->metric); | |
3f5682c8 DS |
3465 | break; |
3466 | case NEXTHOP_TYPE_BLACKHOLE: | |
3467 | vty_out(vty, | |
3468 | "blackhole %2d ", | |
3469 | rinfo->metric); | |
3470 | break; | |
3471 | case NEXTHOP_TYPE_IPV6: | |
3472 | case NEXTHOP_TYPE_IPV6_IFINDEX: | |
3473 | vty_out(vty, | |
3474 | "V6 Address Hidden %2d ", | |
3475 | rinfo->metric); | |
3476 | break; | |
3477 | } | |
d62a17ae | 3478 | |
3479 | /* Route which exist in kernel routing table. */ | |
3480 | if ((rinfo->type == ZEBRA_ROUTE_RIP) | |
3481 | && (rinfo->sub_type == RIP_ROUTE_RTE)) { | |
3482 | vty_out(vty, "%-15s ", | |
3483 | inet_ntoa(rinfo->from)); | |
3484 | vty_out(vty, "%3" ROUTE_TAG_PRI " ", | |
3485 | (route_tag_t)rinfo->tag); | |
3486 | rip_vty_out_uptime(vty, rinfo); | |
3487 | } else if (rinfo->metric | |
3488 | == RIP_METRIC_INFINITY) { | |
3489 | vty_out(vty, "self "); | |
3490 | vty_out(vty, "%3" ROUTE_TAG_PRI " ", | |
3491 | (route_tag_t)rinfo->tag); | |
3492 | rip_vty_out_uptime(vty, rinfo); | |
3493 | } else { | |
3494 | if (rinfo->external_metric) { | |
3495 | len = vty_out( | |
3496 | vty, "self (%s:%d)", | |
3497 | zebra_route_string( | |
3498 | rinfo->type), | |
3499 | rinfo->external_metric); | |
3500 | len = 16 - len; | |
3501 | if (len > 0) | |
3502 | vty_out(vty, "%*s", len, | |
3503 | " "); | |
3504 | } else | |
3505 | vty_out(vty, | |
3506 | "self "); | |
3507 | vty_out(vty, "%3" ROUTE_TAG_PRI, | |
3508 | (route_tag_t)rinfo->tag); | |
3509 | } | |
3510 | ||
3511 | vty_out(vty, "\n"); | |
3512 | } | |
3513 | return CMD_SUCCESS; | |
718e3744 | 3514 | } |
3515 | ||
16705130 | 3516 | /* Vincent: formerly, it was show_ip_protocols_rip: "show ip protocols" */ |
3517 | DEFUN (show_ip_rip_status, | |
3518 | show_ip_rip_status_cmd, | |
3519 | "show ip rip status", | |
718e3744 | 3520 | SHOW_STR |
3521 | IP_STR | |
16705130 | 3522 | "Show RIP routes\n" |
718e3744 | 3523 | "IP routing protocol process parameters and statistics\n") |
3524 | { | |
f4e14fdb | 3525 | struct vrf *vrf = vrf_lookup_by_id(VRF_DEFAULT); |
d62a17ae | 3526 | struct interface *ifp; |
3527 | struct rip_interface *ri; | |
3528 | extern const struct message ri_version_msg[]; | |
3529 | const char *send_version; | |
3530 | const char *receive_version; | |
3531 | ||
3532 | if (!rip) | |
3533 | return CMD_SUCCESS; | |
3534 | ||
3535 | vty_out(vty, "Routing Protocol is \"rip\"\n"); | |
3536 | vty_out(vty, " Sending updates every %ld seconds with +/-50%%,", | |
3537 | rip->update_time); | |
3538 | vty_out(vty, " next due in %lu seconds\n", | |
3539 | thread_timer_remain_second(rip->t_update)); | |
3540 | vty_out(vty, " Timeout after %ld seconds,", rip->timeout_time); | |
3541 | vty_out(vty, " garbage collect after %ld seconds\n", rip->garbage_time); | |
3542 | ||
3543 | /* Filtering status show. */ | |
3544 | config_show_distribute(vty); | |
3545 | ||
3546 | /* Default metric information. */ | |
3547 | vty_out(vty, " Default redistribution metric is %d\n", | |
3548 | rip->default_metric); | |
3549 | ||
3550 | /* Redistribute information. */ | |
3551 | vty_out(vty, " Redistributing:"); | |
3552 | config_write_rip_redistribute(vty, 0); | |
3553 | vty_out(vty, "\n"); | |
3554 | ||
3555 | vty_out(vty, " Default version control: send version %s,", | |
3556 | lookup_msg(ri_version_msg, rip->version_send, NULL)); | |
3557 | if (rip->version_recv == RI_RIP_VERSION_1_AND_2) | |
3558 | vty_out(vty, " receive any version \n"); | |
3559 | else | |
3560 | vty_out(vty, " receive version %s \n", | |
3561 | lookup_msg(ri_version_msg, rip->version_recv, NULL)); | |
3562 | ||
3563 | vty_out(vty, " Interface Send Recv Key-chain\n"); | |
3564 | ||
451fda4f | 3565 | FOR_ALL_INTERFACES (vrf, ifp) { |
d62a17ae | 3566 | ri = ifp->info; |
3567 | ||
3568 | if (!ri->running) | |
3569 | continue; | |
3570 | ||
3571 | if (ri->enable_network || ri->enable_interface) { | |
3572 | if (ri->ri_send == RI_RIP_UNSPEC) | |
3573 | send_version = | |
3574 | lookup_msg(ri_version_msg, | |
3575 | rip->version_send, NULL); | |
3576 | else | |
3577 | send_version = lookup_msg(ri_version_msg, | |
3578 | ri->ri_send, NULL); | |
3579 | ||
3580 | if (ri->ri_receive == RI_RIP_UNSPEC) | |
3581 | receive_version = | |
3582 | lookup_msg(ri_version_msg, | |
3583 | rip->version_recv, NULL); | |
3584 | else | |
3585 | receive_version = lookup_msg( | |
3586 | ri_version_msg, ri->ri_receive, NULL); | |
3587 | ||
3588 | vty_out(vty, " %-17s%-3s %-3s %s\n", ifp->name, | |
3589 | send_version, receive_version, | |
3590 | ri->key_chain ? ri->key_chain : ""); | |
3591 | } | |
3592 | } | |
718e3744 | 3593 | |
d62a17ae | 3594 | vty_out(vty, " Routing for Networks:\n"); |
3595 | config_write_rip_network(vty, 0); | |
718e3744 | 3596 | |
718e3744 | 3597 | { |
d62a17ae | 3598 | int found_passive = 0; |
451fda4f | 3599 | FOR_ALL_INTERFACES (vrf, ifp) { |
d62a17ae | 3600 | ri = ifp->info; |
3601 | ||
3602 | if ((ri->enable_network || ri->enable_interface) | |
3603 | && ri->passive) { | |
3604 | if (!found_passive) { | |
3605 | vty_out(vty, | |
3606 | " Passive Interface(s):\n"); | |
3607 | found_passive = 1; | |
3608 | } | |
3609 | vty_out(vty, " %s\n", ifp->name); | |
3610 | } | |
3611 | } | |
718e3744 | 3612 | } |
3613 | ||
d62a17ae | 3614 | vty_out(vty, " Routing Information Sources:\n"); |
3615 | vty_out(vty, | |
3616 | " Gateway BadPackets BadRoutes Distance Last Update\n"); | |
3617 | rip_peer_display(vty); | |
718e3744 | 3618 | |
d62a17ae | 3619 | rip_distance_show(vty); |
718e3744 | 3620 | |
d62a17ae | 3621 | return CMD_SUCCESS; |
3622 | } | |
718e3744 | 3623 | |
d62a17ae | 3624 | /* RIP configuration write function. */ |
3625 | static int config_write_rip(struct vty *vty) | |
3626 | { | |
3627 | int write = 0; | |
3628 | struct route_node *rn; | |
3629 | struct rip_distance *rdistance; | |
3630 | ||
3631 | if (rip) { | |
3632 | /* Router RIP statement. */ | |
3633 | vty_out(vty, "router rip\n"); | |
3634 | write++; | |
3635 | ||
3636 | /* RIP version statement. Default is RIP version 2. */ | |
3637 | if (rip->version_send != RI_RIP_VERSION_2 | |
3638 | || rip->version_recv != RI_RIP_VERSION_1_AND_2) | |
3639 | vty_out(vty, " version %d\n", rip->version_send); | |
3640 | ||
3641 | /* RIP timer configuration. */ | |
3642 | if (rip->update_time != RIP_UPDATE_TIMER_DEFAULT | |
3643 | || rip->timeout_time != RIP_TIMEOUT_TIMER_DEFAULT | |
3644 | || rip->garbage_time != RIP_GARBAGE_TIMER_DEFAULT) | |
3645 | vty_out(vty, " timers basic %lu %lu %lu\n", | |
3646 | rip->update_time, rip->timeout_time, | |
3647 | rip->garbage_time); | |
3648 | ||
3649 | /* Default information configuration. */ | |
3650 | if (rip->default_information) { | |
3651 | if (rip->default_information_route_map) | |
3652 | vty_out(vty, | |
3653 | " default-information originate route-map %s\n", | |
3654 | rip->default_information_route_map); | |
3655 | else | |
3656 | vty_out(vty, | |
3657 | " default-information originate\n"); | |
3658 | } | |
16705130 | 3659 | |
d62a17ae | 3660 | /* Redistribute configuration. */ |
3661 | config_write_rip_redistribute(vty, 1); | |
3662 | ||
3663 | /* RIP offset-list configuration. */ | |
3664 | config_write_rip_offset_list(vty); | |
3665 | ||
3666 | /* RIP enabled network and interface configuration. */ | |
3667 | config_write_rip_network(vty, 1); | |
3668 | ||
3669 | /* RIP default metric configuration */ | |
3670 | if (rip->default_metric != RIP_DEFAULT_METRIC_DEFAULT) | |
3671 | vty_out(vty, " default-metric %d\n", | |
3672 | rip->default_metric); | |
3673 | ||
3674 | /* Distribute configuration. */ | |
3675 | write += config_write_distribute(vty); | |
3676 | ||
3677 | /* Interface routemap configuration */ | |
3678 | write += config_write_if_rmap(vty); | |
3679 | ||
3680 | /* Distance configuration. */ | |
3681 | if (rip->distance) | |
3682 | vty_out(vty, " distance %d\n", rip->distance); | |
3683 | ||
3684 | /* RIP source IP prefix distance configuration. */ | |
3685 | for (rn = route_top(rip_distance_table); rn; | |
3686 | rn = route_next(rn)) | |
3687 | if ((rdistance = rn->info) != NULL) | |
3688 | vty_out(vty, " distance %d %s/%d %s\n", | |
3689 | rdistance->distance, | |
3690 | inet_ntoa(rn->p.u.prefix4), | |
3691 | rn->p.prefixlen, | |
3692 | rdistance->access_list | |
3693 | ? rdistance->access_list | |
3694 | : ""); | |
3695 | ||
3696 | /* ECMP configuration. */ | |
3697 | if (rip->ecmp) | |
3698 | vty_out(vty, " allow-ecmp\n"); | |
3699 | ||
3700 | /* RIP static route configuration. */ | |
3701 | for (rn = route_top(rip->route); rn; rn = route_next(rn)) | |
3702 | if (rn->info) | |
3703 | vty_out(vty, " route %s/%d\n", | |
3704 | inet_ntoa(rn->p.u.prefix4), | |
3705 | rn->p.prefixlen); | |
3706 | } | |
3707 | return write; | |
3708 | } | |
718e3744 | 3709 | |
d62a17ae | 3710 | /* RIP node structure. */ |
3711 | static struct cmd_node rip_node = {RIP_NODE, "%s(config-router)# ", 1}; | |
718e3744 | 3712 | |
d62a17ae | 3713 | /* Distribute-list update functions. */ |
3714 | static void rip_distribute_update(struct distribute *dist) | |
3715 | { | |
3716 | struct interface *ifp; | |
3717 | struct rip_interface *ri; | |
3718 | struct access_list *alist; | |
3719 | struct prefix_list *plist; | |
8478ae7e | 3720 | |
d62a17ae | 3721 | if (!dist->ifname) |
3722 | return; | |
718e3744 | 3723 | |
d62a17ae | 3724 | ifp = if_lookup_by_name(dist->ifname, VRF_DEFAULT); |
3725 | if (ifp == NULL) | |
3726 | return; | |
718e3744 | 3727 | |
d62a17ae | 3728 | ri = ifp->info; |
6b0655a2 | 3729 | |
d62a17ae | 3730 | if (dist->list[DISTRIBUTE_V4_IN]) { |
3731 | alist = access_list_lookup(AFI_IP, | |
3732 | dist->list[DISTRIBUTE_V4_IN]); | |
3733 | if (alist) | |
3734 | ri->list[RIP_FILTER_IN] = alist; | |
3735 | else | |
3736 | ri->list[RIP_FILTER_IN] = NULL; | |
3737 | } else | |
3738 | ri->list[RIP_FILTER_IN] = NULL; | |
3739 | ||
3740 | if (dist->list[DISTRIBUTE_V4_OUT]) { | |
3741 | alist = access_list_lookup(AFI_IP, | |
3742 | dist->list[DISTRIBUTE_V4_OUT]); | |
3743 | if (alist) | |
3744 | ri->list[RIP_FILTER_OUT] = alist; | |
3745 | else | |
3746 | ri->list[RIP_FILTER_OUT] = NULL; | |
3747 | } else | |
3748 | ri->list[RIP_FILTER_OUT] = NULL; | |
3749 | ||
3750 | if (dist->prefix[DISTRIBUTE_V4_IN]) { | |
3751 | plist = prefix_list_lookup(AFI_IP, | |
3752 | dist->prefix[DISTRIBUTE_V4_IN]); | |
3753 | if (plist) | |
3754 | ri->prefix[RIP_FILTER_IN] = plist; | |
3755 | else | |
3756 | ri->prefix[RIP_FILTER_IN] = NULL; | |
3757 | } else | |
3758 | ri->prefix[RIP_FILTER_IN] = NULL; | |
3759 | ||
3760 | if (dist->prefix[DISTRIBUTE_V4_OUT]) { | |
3761 | plist = prefix_list_lookup(AFI_IP, | |
3762 | dist->prefix[DISTRIBUTE_V4_OUT]); | |
3763 | if (plist) | |
3764 | ri->prefix[RIP_FILTER_OUT] = plist; | |
3765 | else | |
3766 | ri->prefix[RIP_FILTER_OUT] = NULL; | |
3767 | } else | |
3768 | ri->prefix[RIP_FILTER_OUT] = NULL; | |
3769 | } | |
3770 | ||
3771 | void rip_distribute_update_interface(struct interface *ifp) | |
3772 | { | |
3773 | struct distribute *dist; | |
3774 | ||
3775 | dist = distribute_lookup(ifp->name); | |
3776 | if (dist) | |
3777 | rip_distribute_update(dist); | |
718e3744 | 3778 | } |
3779 | ||
3780 | /* Update all interface's distribute list. */ | |
02ff83c5 | 3781 | /* ARGSUSED */ |
d62a17ae | 3782 | static void rip_distribute_update_all(struct prefix_list *notused) |
718e3744 | 3783 | { |
f4e14fdb | 3784 | struct vrf *vrf = vrf_lookup_by_id(VRF_DEFAULT); |
d62a17ae | 3785 | struct interface *ifp; |
718e3744 | 3786 | |
451fda4f | 3787 | FOR_ALL_INTERFACES (vrf, ifp) |
d62a17ae | 3788 | rip_distribute_update_interface(ifp); |
718e3744 | 3789 | } |
11dde9c2 | 3790 | /* ARGSUSED */ |
d62a17ae | 3791 | static void rip_distribute_update_all_wrapper(struct access_list *notused) |
11dde9c2 | 3792 | { |
d62a17ae | 3793 | rip_distribute_update_all(NULL); |
11dde9c2 | 3794 | } |
6b0655a2 | 3795 | |
718e3744 | 3796 | /* Delete all added rip route. */ |
d62a17ae | 3797 | void rip_clean(void) |
718e3744 | 3798 | { |
d62a17ae | 3799 | int i; |
3800 | struct route_node *rp; | |
3801 | struct rip_info *rinfo = NULL; | |
3802 | struct list *list = NULL; | |
3803 | struct listnode *listnode = NULL; | |
3804 | ||
3805 | if (rip) { | |
3806 | QOBJ_UNREG(rip); | |
3807 | ||
3808 | /* Clear RIP routes */ | |
3809 | for (rp = route_top(rip->table); rp; rp = route_next(rp)) | |
3810 | if ((list = rp->info) != NULL) { | |
3811 | rinfo = listgetdata(listhead(list)); | |
3812 | if (rip_route_rte(rinfo)) | |
3813 | rip_zebra_ipv4_delete(rp); | |
3814 | ||
3815 | for (ALL_LIST_ELEMENTS_RO(list, listnode, | |
3816 | rinfo)) { | |
3817 | RIP_TIMER_OFF(rinfo->t_timeout); | |
3818 | RIP_TIMER_OFF(rinfo->t_garbage_collect); | |
3819 | rip_info_free(rinfo); | |
3820 | } | |
affe9e99 | 3821 | list_delete_and_null(&list); |
d62a17ae | 3822 | rp->info = NULL; |
3823 | route_unlock_node(rp); | |
3824 | } | |
3825 | ||
3826 | /* Cancel RIP related timers. */ | |
3827 | RIP_TIMER_OFF(rip->t_update); | |
3828 | RIP_TIMER_OFF(rip->t_triggered_update); | |
3829 | RIP_TIMER_OFF(rip->t_triggered_interval); | |
3830 | ||
3831 | /* Cancel read thread. */ | |
3832 | THREAD_READ_OFF(rip->t_read); | |
3833 | ||
3834 | /* Close RIP socket. */ | |
3835 | if (rip->sock >= 0) { | |
3836 | close(rip->sock); | |
3837 | rip->sock = -1; | |
3838 | } | |
718e3744 | 3839 | |
00c9a53d | 3840 | stream_free(rip->obuf); |
d62a17ae | 3841 | /* Static RIP route configuration. */ |
3842 | for (rp = route_top(rip->route); rp; rp = route_next(rp)) | |
3843 | if (rp->info) { | |
3844 | rp->info = NULL; | |
3845 | route_unlock_node(rp); | |
3846 | } | |
3847 | ||
3848 | /* RIP neighbor configuration. */ | |
3849 | for (rp = route_top(rip->neighbor); rp; rp = route_next(rp)) | |
3850 | if (rp->info) { | |
3851 | rp->info = NULL; | |
3852 | route_unlock_node(rp); | |
3853 | } | |
3854 | ||
3855 | /* Redistribute related clear. */ | |
3856 | if (rip->default_information_route_map) | |
3857 | free(rip->default_information_route_map); | |
3858 | ||
3859 | for (i = 0; i < ZEBRA_ROUTE_MAX; i++) | |
3860 | if (rip->route_map[i].name) | |
3861 | free(rip->route_map[i].name); | |
3862 | ||
3863 | XFREE(MTYPE_ROUTE_TABLE, rip->table); | |
3864 | XFREE(MTYPE_ROUTE_TABLE, rip->route); | |
3865 | XFREE(MTYPE_ROUTE_TABLE, rip->neighbor); | |
3866 | ||
3867 | XFREE(MTYPE_RIP, rip); | |
3868 | rip = NULL; | |
3869 | } | |
3870 | ||
3871 | rip_clean_network(); | |
3872 | rip_passive_nondefault_clean(); | |
3873 | rip_offset_clean(); | |
3874 | rip_interfaces_clean(); | |
3875 | rip_distance_reset(); | |
3876 | rip_redistribute_clean(); | |
718e3744 | 3877 | } |
3878 | ||
3879 | /* Reset all values to the default settings. */ | |
d62a17ae | 3880 | void rip_reset(void) |
718e3744 | 3881 | { |
d62a17ae | 3882 | /* Reset global counters. */ |
3883 | rip_global_route_changes = 0; | |
3884 | rip_global_queries = 0; | |
718e3744 | 3885 | |
d62a17ae | 3886 | /* Call ripd related reset functions. */ |
3887 | rip_debug_reset(); | |
3888 | rip_route_map_reset(); | |
718e3744 | 3889 | |
d62a17ae | 3890 | /* Call library reset functions. */ |
3891 | vty_reset(); | |
3892 | access_list_reset(); | |
3893 | prefix_list_reset(); | |
718e3744 | 3894 | |
d62a17ae | 3895 | distribute_list_reset(); |
718e3744 | 3896 | |
d62a17ae | 3897 | rip_interfaces_reset(); |
3898 | rip_distance_reset(); | |
718e3744 | 3899 | |
d62a17ae | 3900 | rip_zclient_reset(); |
718e3744 | 3901 | } |
3902 | ||
d62a17ae | 3903 | static void rip_if_rmap_update(struct if_rmap *if_rmap) |
16705130 | 3904 | { |
d62a17ae | 3905 | struct interface *ifp; |
3906 | struct rip_interface *ri; | |
3907 | struct route_map *rmap; | |
16705130 | 3908 | |
d62a17ae | 3909 | ifp = if_lookup_by_name(if_rmap->ifname, VRF_DEFAULT); |
3910 | if (ifp == NULL) | |
3911 | return; | |
16705130 | 3912 | |
d62a17ae | 3913 | ri = ifp->info; |
16705130 | 3914 | |
d62a17ae | 3915 | if (if_rmap->routemap[IF_RMAP_IN]) { |
3916 | rmap = route_map_lookup_by_name(if_rmap->routemap[IF_RMAP_IN]); | |
3917 | if (rmap) | |
3918 | ri->routemap[IF_RMAP_IN] = rmap; | |
3919 | else | |
3920 | ri->routemap[IF_RMAP_IN] = NULL; | |
3921 | } else | |
3922 | ri->routemap[RIP_FILTER_IN] = NULL; | |
16705130 | 3923 | |
d62a17ae | 3924 | if (if_rmap->routemap[IF_RMAP_OUT]) { |
3925 | rmap = route_map_lookup_by_name(if_rmap->routemap[IF_RMAP_OUT]); | |
3926 | if (rmap) | |
3927 | ri->routemap[IF_RMAP_OUT] = rmap; | |
3928 | else | |
3929 | ri->routemap[IF_RMAP_OUT] = NULL; | |
3930 | } else | |
3931 | ri->routemap[RIP_FILTER_OUT] = NULL; | |
16705130 | 3932 | } |
3933 | ||
d62a17ae | 3934 | void rip_if_rmap_update_interface(struct interface *ifp) |
16705130 | 3935 | { |
d62a17ae | 3936 | struct if_rmap *if_rmap; |
16705130 | 3937 | |
d62a17ae | 3938 | if_rmap = if_rmap_lookup(ifp->name); |
3939 | if (if_rmap) | |
3940 | rip_if_rmap_update(if_rmap); | |
16705130 | 3941 | } |
3942 | ||
d62a17ae | 3943 | static void rip_routemap_update_redistribute(void) |
16705130 | 3944 | { |
d62a17ae | 3945 | int i; |
16705130 | 3946 | |
d62a17ae | 3947 | if (rip) { |
3948 | for (i = 0; i < ZEBRA_ROUTE_MAX; i++) { | |
3949 | if (rip->route_map[i].name) | |
3950 | rip->route_map[i].map = | |
3951 | route_map_lookup_by_name( | |
3952 | rip->route_map[i].name); | |
3953 | } | |
16705130 | 3954 | } |
16705130 | 3955 | } |
3956 | ||
11dde9c2 | 3957 | /* ARGSUSED */ |
d62a17ae | 3958 | static void rip_routemap_update(const char *notused) |
16705130 | 3959 | { |
f4e14fdb | 3960 | struct vrf *vrf = vrf_lookup_by_id(VRF_DEFAULT); |
d62a17ae | 3961 | struct interface *ifp; |
16705130 | 3962 | |
451fda4f | 3963 | FOR_ALL_INTERFACES (vrf, ifp) |
d62a17ae | 3964 | rip_if_rmap_update_interface(ifp); |
16705130 | 3965 | |
d62a17ae | 3966 | rip_routemap_update_redistribute(); |
16705130 | 3967 | } |
3968 | ||
718e3744 | 3969 | /* Allocate new rip structure and set default value. */ |
d62a17ae | 3970 | void rip_init(void) |
3971 | { | |
3972 | /* Install top nodes. */ | |
3973 | install_node(&rip_node, config_write_rip); | |
3974 | ||
3975 | /* Install rip commands. */ | |
3976 | install_element(VIEW_NODE, &show_ip_rip_cmd); | |
3977 | install_element(VIEW_NODE, &show_ip_rip_status_cmd); | |
3978 | install_element(CONFIG_NODE, &router_rip_cmd); | |
3979 | install_element(CONFIG_NODE, &no_router_rip_cmd); | |
3980 | ||
3981 | install_default(RIP_NODE); | |
3982 | install_element(RIP_NODE, &rip_version_cmd); | |
3983 | install_element(RIP_NODE, &no_rip_version_cmd); | |
3984 | install_element(RIP_NODE, &rip_default_metric_cmd); | |
3985 | install_element(RIP_NODE, &no_rip_default_metric_cmd); | |
3986 | install_element(RIP_NODE, &rip_timers_cmd); | |
3987 | install_element(RIP_NODE, &no_rip_timers_cmd); | |
3988 | install_element(RIP_NODE, &rip_route_cmd); | |
3989 | install_element(RIP_NODE, &no_rip_route_cmd); | |
3990 | install_element(RIP_NODE, &rip_distance_cmd); | |
3991 | install_element(RIP_NODE, &no_rip_distance_cmd); | |
3992 | install_element(RIP_NODE, &rip_distance_source_cmd); | |
3993 | install_element(RIP_NODE, &no_rip_distance_source_cmd); | |
3994 | install_element(RIP_NODE, &rip_distance_source_access_list_cmd); | |
3995 | install_element(RIP_NODE, &no_rip_distance_source_access_list_cmd); | |
3996 | install_element(RIP_NODE, &rip_allow_ecmp_cmd); | |
3997 | install_element(RIP_NODE, &no_rip_allow_ecmp_cmd); | |
3998 | ||
3999 | /* Debug related init. */ | |
4000 | rip_debug_init(); | |
4001 | ||
4002 | /* Access list install. */ | |
4003 | access_list_init(); | |
4004 | access_list_add_hook(rip_distribute_update_all_wrapper); | |
4005 | access_list_delete_hook(rip_distribute_update_all_wrapper); | |
4006 | ||
4007 | /* Prefix list initialize.*/ | |
4008 | prefix_list_init(); | |
4009 | prefix_list_add_hook(rip_distribute_update_all); | |
4010 | prefix_list_delete_hook(rip_distribute_update_all); | |
4011 | ||
4012 | /* Distribute list install. */ | |
4013 | distribute_list_init(RIP_NODE); | |
4014 | distribute_list_add_hook(rip_distribute_update); | |
4015 | distribute_list_delete_hook(rip_distribute_update); | |
4016 | ||
4017 | /* Route-map */ | |
4018 | rip_route_map_init(); | |
4019 | rip_offset_init(); | |
4020 | ||
4021 | route_map_add_hook(rip_routemap_update); | |
4022 | route_map_delete_hook(rip_routemap_update); | |
4023 | ||
4024 | if_rmap_init(RIP_NODE); | |
4025 | if_rmap_hook_add(rip_if_rmap_update); | |
4026 | if_rmap_hook_delete(rip_if_rmap_update); | |
4027 | ||
4028 | /* Distance control. */ | |
4029 | rip_distance_table = route_table_init(); | |
718e3744 | 4030 | } |