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acddc0ed | 1 | // SPDX-License-Identifier: GPL-2.0-or-later |
718e3744 | 2 | /* RIP version 1 and 2. |
fbf5d033 | 3 | * Copyright (C) 2005 6WIND <alain.ritoux@6wind.com> |
718e3744 | 4 | * Copyright (C) 1997, 98, 99 Kunihiro Ishiguro <kunihiro@zebra.org> |
718e3744 | 5 | */ |
6 | ||
7 | #include <zebra.h> | |
8 | ||
b2d7c082 | 9 | #include "vrf.h" |
718e3744 | 10 | #include "if.h" |
11 | #include "command.h" | |
12 | #include "prefix.h" | |
13 | #include "table.h" | |
24a58196 | 14 | #include "frrevent.h" |
718e3744 | 15 | #include "memory.h" |
16 | #include "log.h" | |
17 | #include "stream.h" | |
18 | #include "filter.h" | |
19 | #include "sockunion.h" | |
1af81933 | 20 | #include "sockopt.h" |
718e3744 | 21 | #include "routemap.h" |
16705130 | 22 | #include "if_rmap.h" |
718e3744 | 23 | #include "plist.h" |
24 | #include "distribute.h" | |
0513a271 | 25 | #ifdef CRYPTO_INTERNAL |
c1a03d47 | 26 | #include "md5.h" |
0513a271 | 27 | #endif |
718e3744 | 28 | #include "keychain.h" |
edd7c245 | 29 | #include "privs.h" |
77cbe4a1 | 30 | #include "lib_errors.h" |
8c9226c2 | 31 | #include "northbound_cli.h" |
5920b3eb | 32 | #include "network.h" |
53bb7f9b | 33 | #include "lib/printfrr.h" |
718e3744 | 34 | |
35 | #include "ripd/ripd.h" | |
f80ec39e | 36 | #include "ripd/rip_nb.h" |
718e3744 | 37 | #include "ripd/rip_debug.h" |
518e377f | 38 | #include "ripd/rip_errors.h" |
ae7b826a | 39 | #include "ripd/rip_interface.h" |
718e3744 | 40 | |
0b3acf4f | 41 | /* UDP receive buffer size */ |
42 | #define RIP_UDP_RCV_BUF 41600 | |
43 | ||
bf8d3d6a DL |
44 | DEFINE_MGROUP(RIPD, "ripd"); |
45 | DEFINE_MTYPE_STATIC(RIPD, RIP, "RIP structure"); | |
46 | DEFINE_MTYPE_STATIC(RIPD, RIP_VRF_NAME, "RIP VRF name"); | |
47 | DEFINE_MTYPE_STATIC(RIPD, RIP_INFO, "RIP route info"); | |
48 | DEFINE_MTYPE_STATIC(RIPD, RIP_DISTANCE, "RIP distance"); | |
814a2585 | 49 | |
718e3744 | 50 | /* Prototypes. */ |
d62a17ae | 51 | static void rip_output_process(struct connected *, struct sockaddr_in *, int, |
d7c0a89a | 52 | uint8_t); |
e6685141 | 53 | static void rip_triggered_update(struct event *); |
d62a17ae | 54 | static int rip_update_jitter(unsigned long); |
2826309c RW |
55 | static void rip_distance_table_node_cleanup(struct route_table *table, |
56 | struct route_node *node); | |
ae7b826a RW |
57 | static void rip_instance_enable(struct rip *rip, struct vrf *vrf, int sock); |
58 | static void rip_instance_disable(struct rip *rip); | |
6b0655a2 | 59 | |
03a38493 PG |
60 | static void rip_distribute_update(struct distribute_ctx *ctx, |
61 | struct distribute *dist); | |
62 | ||
4b23867c PG |
63 | static void rip_if_rmap_update(struct if_rmap_ctx *ctx, |
64 | struct if_rmap *if_rmap); | |
65 | ||
718e3744 | 66 | /* RIP output routes type. */ |
d62a17ae | 67 | enum { rip_all_route, rip_changed_route }; |
6b0655a2 | 68 | |
718e3744 | 69 | /* RIP command strings. */ |
d62a17ae | 70 | static const struct message rip_msg[] = {{RIP_REQUEST, "REQUEST"}, |
71 | {RIP_RESPONSE, "RESPONSE"}, | |
72 | {RIP_TRACEON, "TRACEON"}, | |
73 | {RIP_TRACEOFF, "TRACEOFF"}, | |
74 | {RIP_POLL, "POLL"}, | |
75 | {RIP_POLL_ENTRY, "POLL ENTRY"}, | |
76 | {0}}; | |
6b0655a2 | 77 | |
ae7b826a RW |
78 | /* Generate rb-tree of RIP instances. */ |
79 | static inline int rip_instance_compare(const struct rip *a, const struct rip *b) | |
80 | { | |
81 | return strcmp(a->vrf_name, b->vrf_name); | |
82 | } | |
83 | RB_GENERATE(rip_instance_head, rip, entry, rip_instance_compare) | |
84 | ||
85 | struct rip_instance_head rip_instances = RB_INITIALIZER(&rip_instances); | |
86 | ||
ab9939f2 | 87 | /* Utility function to set broadcast option to the socket. */ |
d62a17ae | 88 | static int sockopt_broadcast(int sock) |
718e3744 | 89 | { |
d62a17ae | 90 | int ret; |
91 | int on = 1; | |
718e3744 | 92 | |
d62a17ae | 93 | ret = setsockopt(sock, SOL_SOCKET, SO_BROADCAST, (char *)&on, |
0d6f7fd6 | 94 | sizeof(on)); |
d62a17ae | 95 | if (ret < 0) { |
96 | zlog_warn("can't set sockopt SO_BROADCAST to socket %d", sock); | |
97 | return -1; | |
98 | } | |
99 | return 0; | |
718e3744 | 100 | } |
101 | ||
1137aef4 | 102 | int rip_route_rte(struct rip_info *rinfo) |
718e3744 | 103 | { |
d62a17ae | 104 | return (rinfo->type == ZEBRA_ROUTE_RIP |
105 | && rinfo->sub_type == RIP_ROUTE_RTE); | |
718e3744 | 106 | } |
107 | ||
d62a17ae | 108 | static struct rip_info *rip_info_new(void) |
718e3744 | 109 | { |
d62a17ae | 110 | return XCALLOC(MTYPE_RIP_INFO, sizeof(struct rip_info)); |
718e3744 | 111 | } |
112 | ||
d62a17ae | 113 | void rip_info_free(struct rip_info *rinfo) |
718e3744 | 114 | { |
d62a17ae | 115 | XFREE(MTYPE_RIP_INFO, rinfo); |
718e3744 | 116 | } |
117 | ||
045c5389 RW |
118 | struct rip *rip_info_get_instance(const struct rip_info *rinfo) |
119 | { | |
120 | return route_table_get_info(rinfo->rp->table); | |
121 | } | |
122 | ||
718e3744 | 123 | /* RIP route garbage collect timer. */ |
e6685141 | 124 | static void rip_garbage_collect(struct event *t) |
718e3744 | 125 | { |
d62a17ae | 126 | struct rip_info *rinfo; |
127 | struct route_node *rp; | |
128 | ||
e16d030c | 129 | rinfo = EVENT_ARG(t); |
718e3744 | 130 | |
d62a17ae | 131 | /* Off timeout timer. */ |
e16d030c | 132 | EVENT_OFF(rinfo->t_timeout); |
718e3744 | 133 | |
d62a17ae | 134 | /* Get route_node pointer. */ |
135 | rp = rinfo->rp; | |
718e3744 | 136 | |
d62a17ae | 137 | /* Unlock route_node. */ |
138 | listnode_delete(rp->info, rinfo); | |
139 | if (list_isempty((struct list *)rp->info)) { | |
6a154c88 | 140 | list_delete((struct list **)&rp->info); |
d62a17ae | 141 | route_unlock_node(rp); |
142 | } | |
718e3744 | 143 | |
d62a17ae | 144 | /* Free RIP routing information. */ |
145 | rip_info_free(rinfo); | |
718e3744 | 146 | } |
147 | ||
045c5389 | 148 | static void rip_timeout_update(struct rip *rip, struct rip_info *rinfo); |
bce8e868 LF |
149 | |
150 | /* Add new route to the ECMP list. | |
8478ae7e LF |
151 | * RETURN: the new entry added in the list, or NULL if it is not the first |
152 | * entry and ECMP is not allowed. | |
bce8e868 | 153 | */ |
045c5389 | 154 | struct rip_info *rip_ecmp_add(struct rip *rip, struct rip_info *rinfo_new) |
718e3744 | 155 | { |
d62a17ae | 156 | struct route_node *rp = rinfo_new->rp; |
157 | struct rip_info *rinfo = NULL; | |
75fce464 | 158 | struct rip_info *rinfo_exist = NULL; |
d62a17ae | 159 | struct list *list = NULL; |
75fce464 DA |
160 | struct listnode *node = NULL; |
161 | struct listnode *nnode = NULL; | |
718e3744 | 162 | |
d62a17ae | 163 | if (rp->info == NULL) |
164 | rp->info = list_new(); | |
165 | list = (struct list *)rp->info; | |
bce8e868 | 166 | |
d62a17ae | 167 | /* If ECMP is not allowed and some entry already exists in the list, |
168 | * do nothing. */ | |
169 | if (listcount(list) && !rip->ecmp) | |
170 | return NULL; | |
8478ae7e | 171 | |
75fce464 DA |
172 | /* Add or replace an existing ECMP path with lower neighbor IP */ |
173 | if (listcount(list) && listcount(list) >= rip->ecmp) { | |
174 | struct rip_info *from_highest = NULL; | |
175 | ||
176 | /* Find the rip_info struct that has the highest nexthop IP */ | |
177 | for (ALL_LIST_ELEMENTS(list, node, nnode, rinfo_exist)) | |
178 | if (!from_highest || | |
179 | (from_highest && | |
180 | IPV4_ADDR_CMP(&rinfo_exist->from, | |
181 | &from_highest->from) > 0)) { | |
182 | from_highest = rinfo_exist; | |
183 | } | |
184 | ||
185 | /* If we have a route in ECMP group, delete the old | |
186 | * one that has a higher next-hop address. Lower IP is | |
187 | * preferred. | |
188 | */ | |
189 | if (rip->ecmp > 1 && from_highest && | |
190 | IPV4_ADDR_CMP(&from_highest->from, &rinfo_new->from) > 0) { | |
191 | rip_ecmp_delete(rip, from_highest); | |
192 | goto add_or_replace; | |
193 | } | |
194 | ||
195 | return NULL; | |
196 | } | |
197 | ||
198 | add_or_replace: | |
d62a17ae | 199 | rinfo = rip_info_new(); |
200 | memcpy(rinfo, rinfo_new, sizeof(struct rip_info)); | |
201 | listnode_add(list, rinfo); | |
bce8e868 | 202 | |
d62a17ae | 203 | if (rip_route_rte(rinfo)) { |
045c5389 RW |
204 | rip_timeout_update(rip, rinfo); |
205 | rip_zebra_ipv4_add(rip, rp); | |
d62a17ae | 206 | } |
bce8e868 | 207 | |
d62a17ae | 208 | /* Set the route change flag on the first entry. */ |
209 | rinfo = listgetdata(listhead(list)); | |
210 | SET_FLAG(rinfo->flags, RIP_RTF_CHANGED); | |
bce8e868 | 211 | |
d62a17ae | 212 | /* Signal the output process to trigger an update (see section 2.5). */ |
045c5389 | 213 | rip_event(rip, RIP_TRIGGERED_UPDATE, 0); |
718e3744 | 214 | |
d62a17ae | 215 | return rinfo; |
bce8e868 LF |
216 | } |
217 | ||
218 | /* Replace the ECMP list with the new route. | |
219 | * RETURN: the new entry added in the list | |
220 | */ | |
045c5389 | 221 | struct rip_info *rip_ecmp_replace(struct rip *rip, struct rip_info *rinfo_new) |
d62a17ae | 222 | { |
223 | struct route_node *rp = rinfo_new->rp; | |
224 | struct list *list = (struct list *)rp->info; | |
225 | struct rip_info *rinfo = NULL, *tmp_rinfo = NULL; | |
226 | struct listnode *node = NULL, *nextnode = NULL; | |
227 | ||
228 | if (list == NULL || listcount(list) == 0) | |
045c5389 | 229 | return rip_ecmp_add(rip, rinfo_new); |
d62a17ae | 230 | |
231 | /* Get the first entry */ | |
232 | rinfo = listgetdata(listhead(list)); | |
233 | ||
234 | /* Learnt route replaced by a local one. Delete it from zebra. */ | |
235 | if (rip_route_rte(rinfo) && !rip_route_rte(rinfo_new)) | |
236 | if (CHECK_FLAG(rinfo->flags, RIP_RTF_FIB)) | |
045c5389 | 237 | rip_zebra_ipv4_delete(rip, rp); |
d62a17ae | 238 | |
239 | /* Re-use the first entry, and delete the others. */ | |
91b508dc DS |
240 | for (ALL_LIST_ELEMENTS(list, node, nextnode, tmp_rinfo)) { |
241 | if (tmp_rinfo == rinfo) | |
242 | continue; | |
243 | ||
e16d030c DS |
244 | EVENT_OFF(tmp_rinfo->t_timeout); |
245 | EVENT_OFF(tmp_rinfo->t_garbage_collect); | |
91b508dc DS |
246 | list_delete_node(list, node); |
247 | rip_info_free(tmp_rinfo); | |
248 | } | |
718e3744 | 249 | |
e16d030c DS |
250 | EVENT_OFF(rinfo->t_timeout); |
251 | EVENT_OFF(rinfo->t_garbage_collect); | |
d62a17ae | 252 | memcpy(rinfo, rinfo_new, sizeof(struct rip_info)); |
718e3744 | 253 | |
d62a17ae | 254 | if (rip_route_rte(rinfo)) { |
045c5389 | 255 | rip_timeout_update(rip, rinfo); |
d62a17ae | 256 | /* The ADD message implies an update. */ |
045c5389 | 257 | rip_zebra_ipv4_add(rip, rp); |
d62a17ae | 258 | } |
718e3744 | 259 | |
d62a17ae | 260 | /* Set the route change flag. */ |
261 | SET_FLAG(rinfo->flags, RIP_RTF_CHANGED); | |
718e3744 | 262 | |
d62a17ae | 263 | /* Signal the output process to trigger an update (see section 2.5). */ |
045c5389 | 264 | rip_event(rip, RIP_TRIGGERED_UPDATE, 0); |
718e3744 | 265 | |
d62a17ae | 266 | return rinfo; |
bce8e868 LF |
267 | } |
268 | ||
269 | /* Delete one route from the ECMP list. | |
270 | * RETURN: | |
271 | * null - the entry is freed, and other entries exist in the list | |
272 | * the entry - the entry is the last one in the list; its metric is set | |
273 | * to INFINITY, and the garbage collector is started for it | |
274 | */ | |
045c5389 | 275 | struct rip_info *rip_ecmp_delete(struct rip *rip, struct rip_info *rinfo) |
d62a17ae | 276 | { |
277 | struct route_node *rp = rinfo->rp; | |
278 | struct list *list = (struct list *)rp->info; | |
279 | ||
e16d030c | 280 | EVENT_OFF(rinfo->t_timeout); |
d62a17ae | 281 | |
282 | if (listcount(list) > 1) { | |
283 | /* Some other ECMP entries still exist. Just delete this entry. | |
284 | */ | |
e16d030c | 285 | EVENT_OFF(rinfo->t_garbage_collect); |
d62a17ae | 286 | listnode_delete(list, rinfo); |
287 | if (rip_route_rte(rinfo) | |
288 | && CHECK_FLAG(rinfo->flags, RIP_RTF_FIB)) | |
289 | /* The ADD message implies the update. */ | |
045c5389 | 290 | rip_zebra_ipv4_add(rip, rp); |
d62a17ae | 291 | rip_info_free(rinfo); |
292 | rinfo = NULL; | |
293 | } else { | |
294 | assert(rinfo == listgetdata(listhead(list))); | |
295 | ||
296 | /* This is the only entry left in the list. We must keep it in | |
297 | * the list for garbage collection time, with INFINITY metric. | |
298 | */ | |
299 | ||
300 | rinfo->metric = RIP_METRIC_INFINITY; | |
301 | RIP_TIMER_ON(rinfo->t_garbage_collect, rip_garbage_collect, | |
302 | rip->garbage_time); | |
303 | ||
304 | if (rip_route_rte(rinfo) | |
305 | && CHECK_FLAG(rinfo->flags, RIP_RTF_FIB)) | |
045c5389 | 306 | rip_zebra_ipv4_delete(rip, rp); |
d62a17ae | 307 | } |
bce8e868 | 308 | |
d62a17ae | 309 | /* Set the route change flag on the first entry. */ |
310 | rinfo = listgetdata(listhead(list)); | |
311 | SET_FLAG(rinfo->flags, RIP_RTF_CHANGED); | |
bce8e868 | 312 | |
d62a17ae | 313 | /* Signal the output process to trigger an update (see section 2.5). */ |
045c5389 | 314 | rip_event(rip, RIP_TRIGGERED_UPDATE, 0); |
bce8e868 | 315 | |
d62a17ae | 316 | return rinfo; |
bce8e868 LF |
317 | } |
318 | ||
319 | /* Timeout RIP routes. */ | |
e6685141 | 320 | static void rip_timeout(struct event *t) |
bce8e868 | 321 | { |
e16d030c | 322 | struct rip_info *rinfo = EVENT_ARG(t); |
045c5389 RW |
323 | struct rip *rip = rip_info_get_instance(rinfo); |
324 | ||
325 | rip_ecmp_delete(rip, rinfo); | |
718e3744 | 326 | } |
327 | ||
045c5389 | 328 | static void rip_timeout_update(struct rip *rip, struct rip_info *rinfo) |
718e3744 | 329 | { |
d62a17ae | 330 | if (rinfo->metric != RIP_METRIC_INFINITY) { |
e16d030c | 331 | EVENT_OFF(rinfo->t_timeout); |
907a2395 DS |
332 | event_add_timer(master, rip_timeout, rinfo, rip->timeout_time, |
333 | &rinfo->t_timeout); | |
d62a17ae | 334 | } |
335 | } | |
336 | ||
337 | static int rip_filter(int rip_distribute, struct prefix_ipv4 *p, | |
338 | struct rip_interface *ri) | |
339 | { | |
340 | struct distribute *dist; | |
341 | struct access_list *alist; | |
342 | struct prefix_list *plist; | |
343 | int distribute = rip_distribute == RIP_FILTER_OUT ? DISTRIBUTE_V4_OUT | |
344 | : DISTRIBUTE_V4_IN; | |
345 | const char *inout = rip_distribute == RIP_FILTER_OUT ? "out" : "in"; | |
346 | ||
347 | /* Input distribute-list filtering. */ | |
91b508dc DS |
348 | if (ri->list[rip_distribute] && |
349 | access_list_apply(ri->list[rip_distribute], (struct prefix *)p) == | |
350 | FILTER_DENY) { | |
351 | if (IS_RIP_DEBUG_PACKET) | |
352 | zlog_debug("%pFX filtered by distribute %s", p, inout); | |
353 | return -1; | |
718e3744 | 354 | } |
91b508dc DS |
355 | |
356 | if (ri->prefix[rip_distribute] && | |
357 | prefix_list_apply(ri->prefix[rip_distribute], (struct prefix *)p) == | |
358 | PREFIX_DENY) { | |
359 | if (IS_RIP_DEBUG_PACKET) | |
360 | zlog_debug("%pFX filtered by prefix-list %s", p, inout); | |
361 | return -1; | |
718e3744 | 362 | } |
d62a17ae | 363 | |
364 | /* All interface filter check. */ | |
045c5389 | 365 | dist = distribute_lookup(ri->rip->distribute_ctx, NULL); |
91b508dc DS |
366 | if (!dist) |
367 | return 0; | |
d62a17ae | 368 | |
91b508dc DS |
369 | if (dist->list[distribute]) { |
370 | alist = access_list_lookup(AFI_IP, dist->list[distribute]); | |
371 | ||
372 | if (alist) { | |
373 | if (access_list_apply(alist, (struct prefix *)p) == | |
374 | FILTER_DENY) { | |
375 | if (IS_RIP_DEBUG_PACKET) | |
376 | zlog_debug( | |
377 | "%pFX filtered by distribute %s", | |
378 | p, inout); | |
379 | return -1; | |
d62a17ae | 380 | } |
381 | } | |
91b508dc DS |
382 | } |
383 | if (dist->prefix[distribute]) { | |
384 | plist = prefix_list_lookup(AFI_IP, dist->prefix[distribute]); | |
385 | ||
386 | if (plist) { | |
387 | if (prefix_list_apply(plist, (struct prefix *)p) == | |
388 | PREFIX_DENY) { | |
389 | if (IS_RIP_DEBUG_PACKET) | |
390 | zlog_debug( | |
391 | "%pFX filtered by prefix-list %s", | |
392 | p, inout); | |
393 | return -1; | |
d62a17ae | 394 | } |
395 | } | |
396 | } | |
91b508dc | 397 | |
d62a17ae | 398 | return 0; |
718e3744 | 399 | } |
400 | ||
401 | /* Check nexthop address validity. */ | |
045c5389 | 402 | static int rip_nexthop_check(struct rip *rip, struct in_addr *addr) |
718e3744 | 403 | { |
d62a17ae | 404 | struct interface *ifp; |
f4e14fdb | 405 | struct listnode *cnode; |
d62a17ae | 406 | struct connected *ifc; |
407 | struct prefix *p; | |
718e3744 | 408 | |
d62a17ae | 409 | /* If nexthop address matches local configured address then it is |
410 | invalid nexthop. */ | |
b2d7c082 | 411 | |
ae7b826a | 412 | FOR_ALL_INTERFACES (rip->vrf, ifp) { |
d62a17ae | 413 | for (ALL_LIST_ELEMENTS_RO(ifp->connected, cnode, ifc)) { |
414 | p = ifc->address; | |
718e3744 | 415 | |
d62a17ae | 416 | if (p->family == AF_INET |
417 | && IPV4_ADDR_SAME(&p->u.prefix4, addr)) | |
418 | return -1; | |
419 | } | |
718e3744 | 420 | } |
d62a17ae | 421 | return 0; |
718e3744 | 422 | } |
423 | ||
424 | /* RIP add route to routing table. */ | |
d62a17ae | 425 | static void rip_rte_process(struct rte *rte, struct sockaddr_in *from, |
426 | struct interface *ifp) | |
427 | { | |
045c5389 | 428 | struct rip *rip; |
d62a17ae | 429 | int ret; |
430 | struct prefix_ipv4 p; | |
431 | struct route_node *rp; | |
432 | struct rip_info *rinfo = NULL, newinfo; | |
433 | struct rip_interface *ri; | |
434 | struct in_addr *nexthop; | |
435 | int same = 0; | |
436 | unsigned char old_dist, new_dist; | |
437 | struct list *list = NULL; | |
438 | struct listnode *node = NULL; | |
439 | ||
440 | /* Make prefix structure. */ | |
441 | memset(&p, 0, sizeof(struct prefix_ipv4)); | |
442 | p.family = AF_INET; | |
443 | p.prefix = rte->prefix; | |
444 | p.prefixlen = ip_masklen(rte->mask); | |
445 | ||
446 | /* Make sure mask is applied. */ | |
447 | apply_mask_ipv4(&p); | |
448 | ||
d62a17ae | 449 | ri = ifp->info; |
045c5389 | 450 | rip = ri->rip; |
718e3744 | 451 | |
045c5389 | 452 | /* Apply input filters. */ |
d62a17ae | 453 | ret = rip_filter(RIP_FILTER_IN, &p, ri); |
454 | if (ret < 0) | |
455 | return; | |
456 | ||
457 | memset(&newinfo, 0, sizeof(newinfo)); | |
458 | newinfo.type = ZEBRA_ROUTE_RIP; | |
459 | newinfo.sub_type = RIP_ROUTE_RTE; | |
dd127197 | 460 | newinfo.nh.gate.ipv4 = rte->nexthop; |
d62a17ae | 461 | newinfo.from = from->sin_addr; |
dd127197 DS |
462 | newinfo.nh.ifindex = ifp->ifindex; |
463 | newinfo.nh.type = NEXTHOP_TYPE_IPV4_IFINDEX; | |
d62a17ae | 464 | newinfo.metric = rte->metric; |
465 | newinfo.metric_out = rte->metric; /* XXX */ | |
466 | newinfo.tag = ntohs(rte->tag); /* XXX */ | |
467 | ||
468 | /* Modify entry according to the interface routemap. */ | |
469 | if (ri->routemap[RIP_FILTER_IN]) { | |
d62a17ae | 470 | /* The object should be of the type of rip_info */ |
471 | ret = route_map_apply(ri->routemap[RIP_FILTER_IN], | |
1782514f | 472 | (struct prefix *)&p, &newinfo); |
d62a17ae | 473 | |
474 | if (ret == RMAP_DENYMATCH) { | |
475 | if (IS_RIP_DEBUG_PACKET) | |
476 | zlog_debug( | |
53bb7f9b MS |
477 | "RIP %pFX is filtered by route-map in", |
478 | &p); | |
d62a17ae | 479 | return; |
480 | } | |
481 | ||
482 | /* Get back the object */ | |
483 | rte->nexthop = newinfo.nexthop_out; | |
484 | rte->tag = htons(newinfo.tag_out); /* XXX */ | |
996c9314 LB |
485 | rte->metric = newinfo.metric_out; /* XXX: the routemap uses the |
486 | metric_out field */ | |
d62a17ae | 487 | } |
488 | ||
489 | /* Once the entry has been validated, update the metric by | |
ab9939f2 | 490 | adding the cost of the network on which the message |
d62a17ae | 491 | arrived. If the result is greater than infinity, use infinity |
492 | (RFC2453 Sec. 3.9.2) */ | |
493 | /* Zebra ripd can handle offset-list in. */ | |
494 | ret = rip_offset_list_apply_in(&p, ifp, &rte->metric); | |
718e3744 | 495 | |
d62a17ae | 496 | /* If offset-list does not modify the metric use interface's |
497 | metric. */ | |
498 | if (!ret) | |
499 | rte->metric += ifp->metric ? ifp->metric : 1; | |
718e3744 | 500 | |
d62a17ae | 501 | if (rte->metric > RIP_METRIC_INFINITY) |
502 | rte->metric = RIP_METRIC_INFINITY; | |
503 | ||
504 | /* Set nexthop pointer. */ | |
3a6290bd | 505 | if (rte->nexthop.s_addr == INADDR_ANY) |
d62a17ae | 506 | nexthop = &from->sin_addr; |
507 | else | |
508 | nexthop = &rte->nexthop; | |
509 | ||
510 | /* Check if nexthop address is myself, then do nothing. */ | |
045c5389 | 511 | if (rip_nexthop_check(rip, nexthop) < 0) { |
d62a17ae | 512 | if (IS_RIP_DEBUG_PACKET) |
53bb7f9b MS |
513 | zlog_debug("Nexthop address %pI4 is myself", |
514 | nexthop); | |
d62a17ae | 515 | return; |
516 | } | |
517 | ||
518 | /* Get index for the prefix. */ | |
519 | rp = route_node_get(rip->table, (struct prefix *)&p); | |
520 | ||
521 | newinfo.rp = rp; | |
dd127197 DS |
522 | newinfo.nh.gate.ipv4 = *nexthop; |
523 | newinfo.nh.type = NEXTHOP_TYPE_IPV4; | |
d62a17ae | 524 | newinfo.metric = rte->metric; |
525 | newinfo.tag = ntohs(rte->tag); | |
045c5389 | 526 | newinfo.distance = rip_distance_apply(rip, &newinfo); |
d62a17ae | 527 | |
528 | new_dist = newinfo.distance ? newinfo.distance | |
529 | : ZEBRA_RIP_DISTANCE_DEFAULT; | |
530 | ||
531 | /* Check to see whether there is already RIP route on the table. */ | |
532 | if ((list = rp->info) != NULL) | |
533 | for (ALL_LIST_ELEMENTS_RO(list, node, rinfo)) { | |
534 | /* Need to compare with redistributed entry or local | |
535 | * entry */ | |
536 | if (!rip_route_rte(rinfo)) | |
537 | break; | |
538 | ||
539 | if (IPV4_ADDR_SAME(&rinfo->from, &from->sin_addr) | |
dd127197 | 540 | && IPV4_ADDR_SAME(&rinfo->nh.gate.ipv4, nexthop)) |
d62a17ae | 541 | break; |
542 | ||
91b508dc DS |
543 | if (listnextnode(node)) |
544 | continue; | |
d62a17ae | 545 | |
91b508dc | 546 | /* Not found in the list */ |
d62a17ae | 547 | |
91b508dc DS |
548 | if (rte->metric > rinfo->metric) { |
549 | /* New route has a greater metric. | |
550 | * Discard it. */ | |
551 | route_unlock_node(rp); | |
552 | return; | |
553 | } | |
d62a17ae | 554 | |
91b508dc DS |
555 | if (rte->metric < rinfo->metric) |
556 | /* New route has a smaller metric. | |
557 | * Replace the ECMP list | |
558 | * with the new one in below. */ | |
559 | break; | |
560 | ||
561 | /* Metrics are same. We compare the distances. | |
562 | */ | |
563 | old_dist = rinfo->distance ? rinfo->distance | |
d62a17ae | 564 | : ZEBRA_RIP_DISTANCE_DEFAULT; |
565 | ||
91b508dc DS |
566 | if (new_dist > old_dist) { |
567 | /* New route has a greater distance. | |
568 | * Discard it. */ | |
569 | route_unlock_node(rp); | |
570 | return; | |
571 | } | |
d62a17ae | 572 | |
91b508dc DS |
573 | if (new_dist < old_dist) |
574 | /* New route has a smaller distance. | |
575 | * Replace the ECMP list | |
576 | * with the new one in below. */ | |
577 | break; | |
d62a17ae | 578 | |
91b508dc DS |
579 | /* Metrics and distances are both same. Keep |
580 | * "rinfo" null and | |
581 | * the new route is added in the ECMP list in | |
582 | * below. */ | |
718e3744 | 583 | } |
d62a17ae | 584 | |
585 | if (rinfo) { | |
586 | /* Local static route. */ | |
587 | if (rinfo->type == ZEBRA_ROUTE_RIP | |
588 | && ((rinfo->sub_type == RIP_ROUTE_STATIC) | |
589 | || (rinfo->sub_type == RIP_ROUTE_DEFAULT)) | |
590 | && rinfo->metric != RIP_METRIC_INFINITY) { | |
591 | route_unlock_node(rp); | |
592 | return; | |
718e3744 | 593 | } |
d62a17ae | 594 | |
595 | /* Redistributed route check. */ | |
596 | if (rinfo->type != ZEBRA_ROUTE_RIP | |
597 | && rinfo->metric != RIP_METRIC_INFINITY) { | |
598 | old_dist = rinfo->distance; | |
599 | /* Only routes directly connected to an interface | |
600 | * (nexthop == 0) | |
601 | * may have a valid NULL distance */ | |
3a6290bd | 602 | if (rinfo->nh.gate.ipv4.s_addr != INADDR_ANY) |
d62a17ae | 603 | old_dist = old_dist |
604 | ? old_dist | |
605 | : ZEBRA_RIP_DISTANCE_DEFAULT; | |
606 | /* If imported route does not have STRICT precedence, | |
607 | mark it as a ghost */ | |
608 | if (new_dist <= old_dist | |
609 | && rte->metric != RIP_METRIC_INFINITY) | |
045c5389 | 610 | rip_ecmp_replace(rip, &newinfo); |
d62a17ae | 611 | |
612 | route_unlock_node(rp); | |
613 | return; | |
718e3744 | 614 | } |
d62a17ae | 615 | } |
616 | ||
617 | if (!rinfo) { | |
618 | if (rp->info) | |
619 | route_unlock_node(rp); | |
620 | ||
621 | /* Now, check to see whether there is already an explicit route | |
622 | for the destination prefix. If there is no such route, add | |
623 | this route to the routing table, unless the metric is | |
624 | infinity (there is no point in adding a route which | |
625 | unusable). */ | |
626 | if (rte->metric != RIP_METRIC_INFINITY) | |
045c5389 | 627 | rip_ecmp_add(rip, &newinfo); |
d62a17ae | 628 | } else { |
629 | /* Route is there but we are not sure the route is RIP or not. | |
630 | */ | |
631 | ||
632 | /* If there is an existing route, compare the next hop address | |
633 | to the address of the router from which the datagram came. | |
634 | If this datagram is from the same router as the existing | |
635 | route, reinitialize the timeout. */ | |
636 | same = (IPV4_ADDR_SAME(&rinfo->from, &from->sin_addr) | |
dd127197 | 637 | && (rinfo->nh.ifindex == ifp->ifindex)); |
d62a17ae | 638 | |
639 | old_dist = rinfo->distance ? rinfo->distance | |
640 | : ZEBRA_RIP_DISTANCE_DEFAULT; | |
641 | ||
642 | /* Next, compare the metrics. If the datagram is from the same | |
643 | router as the existing route, and the new metric is different | |
644 | than the old one; or, if the new metric is lower than the old | |
645 | one, or if the tag has been changed; or if there is a route | |
646 | with a lower administrave distance; or an update of the | |
647 | distance on the actual route; do the following actions: */ | |
648 | if ((same && rinfo->metric != rte->metric) | |
649 | || (rte->metric < rinfo->metric) | |
650 | || ((same) && (rinfo->metric == rte->metric) | |
651 | && (newinfo.tag != rinfo->tag)) | |
652 | || (old_dist > new_dist) | |
653 | || ((old_dist != new_dist) && same)) { | |
654 | if (listcount(list) == 1) { | |
655 | if (newinfo.metric != RIP_METRIC_INFINITY) | |
045c5389 | 656 | rip_ecmp_replace(rip, &newinfo); |
d62a17ae | 657 | else |
045c5389 | 658 | rip_ecmp_delete(rip, rinfo); |
d62a17ae | 659 | } else { |
660 | if (newinfo.metric < rinfo->metric) | |
045c5389 | 661 | rip_ecmp_replace(rip, &newinfo); |
d62a17ae | 662 | else if (newinfo.metric > rinfo->metric) |
045c5389 | 663 | rip_ecmp_delete(rip, rinfo); |
d62a17ae | 664 | else if (new_dist < old_dist) |
045c5389 | 665 | rip_ecmp_replace(rip, &newinfo); |
d62a17ae | 666 | else if (new_dist > old_dist) |
045c5389 | 667 | rip_ecmp_delete(rip, rinfo); |
d62a17ae | 668 | else { |
669 | int update = CHECK_FLAG(rinfo->flags, | |
670 | RIP_RTF_FIB) | |
671 | ? 1 | |
672 | : 0; | |
673 | ||
674 | assert(newinfo.metric | |
675 | != RIP_METRIC_INFINITY); | |
676 | ||
e16d030c DS |
677 | EVENT_OFF(rinfo->t_timeout); |
678 | EVENT_OFF(rinfo->t_garbage_collect); | |
d62a17ae | 679 | memcpy(rinfo, &newinfo, |
680 | sizeof(struct rip_info)); | |
045c5389 | 681 | rip_timeout_update(rip, rinfo); |
d62a17ae | 682 | |
683 | if (update) | |
045c5389 | 684 | rip_zebra_ipv4_add(rip, rp); |
d62a17ae | 685 | |
686 | /* - Set the route change flag on the | |
687 | * first entry. */ | |
688 | rinfo = listgetdata(listhead(list)); | |
689 | SET_FLAG(rinfo->flags, RIP_RTF_CHANGED); | |
045c5389 | 690 | rip_event(rip, RIP_TRIGGERED_UPDATE, 0); |
d62a17ae | 691 | } |
692 | } | |
693 | } else /* same & no change */ | |
045c5389 | 694 | rip_timeout_update(rip, rinfo); |
d62a17ae | 695 | |
696 | /* Unlock tempolary lock of the route. */ | |
697 | route_unlock_node(rp); | |
698 | } | |
699 | } | |
700 | ||
701 | /* Dump RIP packet */ | |
702 | static void rip_packet_dump(struct rip_packet *packet, int size, | |
703 | const char *sndrcv) | |
704 | { | |
705 | caddr_t lim; | |
706 | struct rte *rte; | |
707 | const char *command_str; | |
d7c0a89a QY |
708 | uint8_t netmask = 0; |
709 | uint8_t *p; | |
d62a17ae | 710 | |
711 | /* Set command string. */ | |
712 | if (packet->command > 0 && packet->command < RIP_COMMAND_MAX) | |
713 | command_str = lookup_msg(rip_msg, packet->command, NULL); | |
714 | else | |
715 | command_str = "unknown"; | |
716 | ||
717 | /* Dump packet header. */ | |
718 | zlog_debug("%s %s version %d packet size %d", sndrcv, command_str, | |
719 | packet->version, size); | |
720 | ||
721 | /* Dump each routing table entry. */ | |
722 | rte = packet->rte; | |
723 | ||
724 | for (lim = (caddr_t)packet + size; (caddr_t)rte < lim; rte++) { | |
725 | if (packet->version == RIPv2) { | |
726 | netmask = ip_masklen(rte->mask); | |
727 | ||
728 | if (rte->family == htons(RIP_FAMILY_AUTH)) { | |
729 | if (rte->tag | |
730 | == htons(RIP_AUTH_SIMPLE_PASSWORD)) { | |
d7c0a89a | 731 | p = (uint8_t *)&rte->prefix; |
d62a17ae | 732 | |
733 | zlog_debug( | |
734 | " family 0x%X type %d auth string: %s", | |
735 | ntohs(rte->family), | |
736 | ntohs(rte->tag), p); | |
737 | } else if (rte->tag == htons(RIP_AUTH_MD5)) { | |
738 | struct rip_md5_info *md5; | |
739 | ||
740 | md5 = (struct rip_md5_info *)&packet | |
741 | ->rte; | |
742 | ||
743 | zlog_debug( | |
744 | " family 0x%X type %d (MD5 authentication)", | |
745 | ntohs(md5->family), | |
746 | ntohs(md5->type)); | |
747 | zlog_debug( | |
3efd0893 | 748 | " RIP-2 packet len %d Key ID %d Auth Data len %d", |
d62a17ae | 749 | ntohs(md5->packet_len), |
750 | md5->keyid, md5->auth_len); | |
d7c0a89a QY |
751 | zlog_debug(" Sequence Number %ld", |
752 | (unsigned long)ntohl( | |
753 | md5->sequence)); | |
d62a17ae | 754 | } else if (rte->tag == htons(RIP_AUTH_DATA)) { |
d7c0a89a | 755 | p = (uint8_t *)&rte->prefix; |
d62a17ae | 756 | |
757 | zlog_debug( | |
758 | " family 0x%X type %d (MD5 data)", | |
759 | ntohs(rte->family), | |
760 | ntohs(rte->tag)); | |
761 | zlog_debug( | |
3efd0893 | 762 | " MD5: %02X%02X%02X%02X%02X%02X%02X%02X%02X%02X%02X%02X%02X%02X%02X%02X", |
d62a17ae | 763 | p[0], p[1], p[2], p[3], p[4], |
764 | p[5], p[6], p[7], p[8], p[9], | |
765 | p[10], p[11], p[12], p[13], | |
766 | p[14], p[15]); | |
767 | } else { | |
768 | zlog_debug( | |
769 | " family 0x%X type %d (Unknown auth type)", | |
770 | ntohs(rte->family), | |
771 | ntohs(rte->tag)); | |
772 | } | |
773 | } else | |
774 | zlog_debug( | |
2e2262fe | 775 | " %pI4/%d -> %pI4 family %d tag %" ROUTE_TAG_PRI |
d62a17ae | 776 | " metric %ld", |
2e2262fe | 777 | &rte->prefix, netmask, &rte->nexthop, |
d62a17ae | 778 | ntohs(rte->family), |
779 | (route_tag_t)ntohs(rte->tag), | |
d7c0a89a | 780 | (unsigned long)ntohl(rte->metric)); |
d62a17ae | 781 | } else { |
2e2262fe DS |
782 | zlog_debug(" %pI4 family %d tag %" ROUTE_TAG_PRI |
783 | " metric %ld", | |
784 | &rte->prefix, ntohs(rte->family), | |
785 | (route_tag_t)ntohs(rte->tag), | |
786 | (unsigned long)ntohl(rte->metric)); | |
718e3744 | 787 | } |
718e3744 | 788 | } |
718e3744 | 789 | } |
790 | ||
791 | /* Check if the destination address is valid (unicast; not net 0 | |
792 | or 127) (RFC2453 Section 3.9.2 - Page 26). But we don't | |
793 | check net 0 because we accept default route. */ | |
d62a17ae | 794 | static int rip_destination_check(struct in_addr addr) |
718e3744 | 795 | { |
d7c0a89a | 796 | uint32_t destination; |
718e3744 | 797 | |
d62a17ae | 798 | /* Convert to host byte order. */ |
799 | destination = ntohl(addr.s_addr); | |
718e3744 | 800 | |
d62a17ae | 801 | if (IPV4_NET127(destination)) |
802 | return 0; | |
718e3744 | 803 | |
d62a17ae | 804 | /* Net 0 may match to the default route. */ |
805 | if (IPV4_NET0(destination) && destination != 0) | |
806 | return 0; | |
718e3744 | 807 | |
d62a17ae | 808 | /* Unicast address must belong to class A, B, C. */ |
809 | if (IN_CLASSA(destination)) | |
810 | return 1; | |
811 | if (IN_CLASSB(destination)) | |
812 | return 1; | |
813 | if (IN_CLASSC(destination)) | |
814 | return 1; | |
718e3744 | 815 | |
d62a17ae | 816 | return 0; |
718e3744 | 817 | } |
818 | ||
819 | /* RIP version 2 authentication. */ | |
d62a17ae | 820 | static int rip_auth_simple_password(struct rte *rte, struct sockaddr_in *from, |
821 | struct interface *ifp) | |
822 | { | |
823 | struct rip_interface *ri; | |
0961ea93 | 824 | char *auth_str = (char *)rte + offsetof(struct rte, prefix); |
d62a17ae | 825 | int i; |
826 | ||
827 | /* reject passwords with zeros in the middle of the string */ | |
0961ea93 | 828 | for (i = strnlen(auth_str, 16); i < 16; i++) { |
d62a17ae | 829 | if (auth_str[i] != '\0') |
830 | return 0; | |
831 | } | |
832 | ||
833 | if (IS_RIP_DEBUG_EVENT) | |
53bb7f9b MS |
834 | zlog_debug("RIPv2 simple password authentication from %pI4", |
835 | &from->sin_addr); | |
d62a17ae | 836 | |
837 | ri = ifp->info; | |
838 | ||
839 | if (ri->auth_type != RIP_AUTH_SIMPLE_PASSWORD | |
840 | || rte->tag != htons(RIP_AUTH_SIMPLE_PASSWORD)) | |
841 | return 0; | |
718e3744 | 842 | |
d62a17ae | 843 | /* Simple password authentication. */ |
844 | if (ri->auth_str) { | |
845 | if (strncmp(auth_str, ri->auth_str, 16) == 0) | |
846 | return 1; | |
847 | } | |
848 | if (ri->key_chain) { | |
849 | struct keychain *keychain; | |
850 | struct key *key; | |
851 | ||
852 | keychain = keychain_lookup(ri->key_chain); | |
c4efb224 | 853 | if (keychain == NULL || keychain->key == NULL) |
d62a17ae | 854 | return 0; |
855 | ||
856 | key = key_match_for_accept(keychain, auth_str); | |
857 | if (key) | |
858 | return 1; | |
859 | } | |
860 | return 0; | |
718e3744 | 861 | } |
862 | ||
863 | /* RIP version 2 authentication with MD5. */ | |
d62a17ae | 864 | static int rip_auth_md5(struct rip_packet *packet, struct sockaddr_in *from, |
865 | int length, struct interface *ifp) | |
866 | { | |
867 | struct rip_interface *ri; | |
868 | struct rip_md5_info *md5; | |
869 | struct rip_md5_data *md5data; | |
870 | struct keychain *keychain; | |
871 | struct key *key; | |
0513a271 MR |
872 | #ifdef CRYPTO_OPENSSL |
873 | EVP_MD_CTX *ctx; | |
874 | #elif CRYPTO_INTERNAL | |
d62a17ae | 875 | MD5_CTX ctx; |
0513a271 | 876 | #endif |
d7c0a89a QY |
877 | uint8_t digest[RIP_AUTH_MD5_SIZE]; |
878 | uint16_t packet_len; | |
5c84f238 | 879 | char auth_str[RIP_AUTH_MD5_SIZE] = {}; |
d62a17ae | 880 | |
881 | if (IS_RIP_DEBUG_EVENT) | |
53bb7f9b MS |
882 | zlog_debug("RIPv2 MD5 authentication from %pI4", |
883 | &from->sin_addr); | |
718e3744 | 884 | |
d62a17ae | 885 | ri = ifp->info; |
886 | md5 = (struct rip_md5_info *)&packet->rte; | |
887 | ||
888 | /* Check auth type. */ | |
889 | if (ri->auth_type != RIP_AUTH_MD5 || md5->type != htons(RIP_AUTH_MD5)) | |
890 | return 0; | |
891 | ||
892 | /* If the authentication length is less than 16, then it must be wrong | |
893 | * for | |
894 | * any interpretation of rfc2082. Some implementations also interpret | |
895 | * this as RIP_HEADER_SIZE+ RIP_AUTH_MD5_SIZE, aka | |
896 | * RIP_AUTH_MD5_COMPAT_SIZE. | |
897 | */ | |
898 | if (!((md5->auth_len == RIP_AUTH_MD5_SIZE) | |
899 | || (md5->auth_len == RIP_AUTH_MD5_COMPAT_SIZE))) { | |
900 | if (IS_RIP_DEBUG_EVENT) | |
901 | zlog_debug( | |
3efd0893 | 902 | "RIPv2 MD5 authentication, strange authentication length field %d", |
d62a17ae | 903 | md5->auth_len); |
904 | return 0; | |
905 | } | |
906 | ||
907 | /* grab and verify check packet length */ | |
908 | packet_len = ntohs(md5->packet_len); | |
718e3744 | 909 | |
d62a17ae | 910 | if (packet_len > (length - RIP_HEADER_SIZE - RIP_AUTH_MD5_SIZE)) { |
911 | if (IS_RIP_DEBUG_EVENT) | |
912 | zlog_debug( | |
3efd0893 | 913 | "RIPv2 MD5 authentication, packet length field %d greater than received length %d!", |
d62a17ae | 914 | md5->packet_len, length); |
915 | return 0; | |
916 | } | |
917 | ||
918 | /* retrieve authentication data */ | |
d7c0a89a | 919 | md5data = (struct rip_md5_data *)(((uint8_t *)packet) + packet_len); |
d62a17ae | 920 | |
d62a17ae | 921 | if (ri->key_chain) { |
922 | keychain = keychain_lookup(ri->key_chain); | |
923 | if (keychain == NULL) | |
924 | return 0; | |
925 | ||
926 | key = key_lookup_for_accept(keychain, md5->keyid); | |
e65e227f | 927 | if (key == NULL || key->string == NULL) |
d62a17ae | 928 | return 0; |
929 | ||
b5b4f44e IR |
930 | memcpy(auth_str, key->string, |
931 | MIN(sizeof(auth_str), strlen(key->string))); | |
d62a17ae | 932 | } else if (ri->auth_str) |
b5b4f44e IR |
933 | memcpy(auth_str, ri->auth_str, |
934 | MIN(sizeof(auth_str), strlen(ri->auth_str))); | |
d62a17ae | 935 | |
936 | if (auth_str[0] == 0) | |
937 | return 0; | |
938 | ||
939 | /* MD5 digest authentication. */ | |
0513a271 MR |
940 | #ifdef CRYPTO_OPENSSL |
941 | unsigned int md5_size = RIP_AUTH_MD5_SIZE; | |
942 | ctx = EVP_MD_CTX_new(); | |
943 | EVP_DigestInit(ctx, EVP_md5()); | |
944 | EVP_DigestUpdate(ctx, packet, packet_len + RIP_HEADER_SIZE); | |
945 | EVP_DigestUpdate(ctx, auth_str, RIP_AUTH_MD5_SIZE); | |
946 | EVP_DigestFinal(ctx, digest, &md5_size); | |
947 | EVP_MD_CTX_free(ctx); | |
948 | #elif CRYPTO_INTERNAL | |
d62a17ae | 949 | memset(&ctx, 0, sizeof(ctx)); |
950 | MD5Init(&ctx); | |
951 | MD5Update(&ctx, packet, packet_len + RIP_HEADER_SIZE); | |
952 | MD5Update(&ctx, auth_str, RIP_AUTH_MD5_SIZE); | |
953 | MD5Final(digest, &ctx); | |
0513a271 | 954 | #endif |
d62a17ae | 955 | |
956 | if (memcmp(md5data->digest, digest, RIP_AUTH_MD5_SIZE) == 0) | |
957 | return packet_len; | |
958 | else | |
959 | return 0; | |
718e3744 | 960 | } |
961 | ||
b14ee00b | 962 | /* Pick correct auth string for sends, prepare auth_str buffer for use. |
963 | * (left justified and padded). | |
964 | * | |
965 | * presumes one of ri or key is valid, and that the auth strings they point | |
966 | * to are nul terminated. If neither are present, auth_str will be fully | |
967 | * zero padded. | |
968 | * | |
969 | */ | |
d62a17ae | 970 | static void rip_auth_prepare_str_send(struct rip_interface *ri, struct key *key, |
971 | char *auth_str, int len) | |
718e3744 | 972 | { |
d62a17ae | 973 | assert(ri || key); |
718e3744 | 974 | |
d62a17ae | 975 | memset(auth_str, 0, len); |
976 | if (key && key->string) | |
b5b4f44e IR |
977 | memcpy(auth_str, key->string, |
978 | MIN((size_t)len, strlen(key->string))); | |
d62a17ae | 979 | else if (ri->auth_str) |
b5b4f44e IR |
980 | memcpy(auth_str, ri->auth_str, |
981 | MIN((size_t)len, strlen(ri->auth_str))); | |
718e3744 | 982 | |
d62a17ae | 983 | return; |
b14ee00b | 984 | } |
718e3744 | 985 | |
b14ee00b | 986 | /* Write RIPv2 simple password authentication information |
987 | * | |
d62a17ae | 988 | * auth_str is presumed to be 2 bytes and correctly prepared |
b14ee00b | 989 | * (left justified and zero padded). |
990 | */ | |
d62a17ae | 991 | static void rip_auth_simple_write(struct stream *s, char *auth_str, int len) |
b14ee00b | 992 | { |
d62a17ae | 993 | assert(s && len == RIP_AUTH_SIMPLE_SIZE); |
994 | ||
995 | stream_putw(s, RIP_FAMILY_AUTH); | |
996 | stream_putw(s, RIP_AUTH_SIMPLE_PASSWORD); | |
997 | stream_put(s, auth_str, RIP_AUTH_SIMPLE_SIZE); | |
998 | ||
999 | return; | |
b14ee00b | 1000 | } |
718e3744 | 1001 | |
d62a17ae | 1002 | /* write RIPv2 MD5 "authentication header" |
b14ee00b | 1003 | * (uses the auth key data field) |
1004 | * | |
1005 | * Digest offset field is set to 0. | |
1006 | * | |
1007 | * returns: offset of the digest offset field, which must be set when | |
1008 | * length to the auth-data MD5 digest is known. | |
1009 | */ | |
d62a17ae | 1010 | static size_t rip_auth_md5_ah_write(struct stream *s, struct rip_interface *ri, |
1011 | struct key *key) | |
1012 | { | |
1013 | size_t doff = 0; | |
1568e88a | 1014 | static uint32_t seq = 0; |
d62a17ae | 1015 | |
1016 | assert(s && ri && ri->auth_type == RIP_AUTH_MD5); | |
1017 | ||
1018 | /* MD5 authentication. */ | |
1019 | stream_putw(s, RIP_FAMILY_AUTH); | |
1020 | stream_putw(s, RIP_AUTH_MD5); | |
1021 | ||
1022 | /* MD5 AH digest offset field. | |
1023 | * | |
1024 | * Set to placeholder value here, to true value when RIP-2 Packet length | |
1025 | * is known. Actual value is set in .....(). | |
1026 | */ | |
1027 | doff = stream_get_endp(s); | |
1028 | stream_putw(s, 0); | |
1029 | ||
1030 | /* Key ID. */ | |
1031 | if (key) | |
1032 | stream_putc(s, key->index % 256); | |
1033 | else | |
1034 | stream_putc(s, 1); | |
1035 | ||
1036 | /* Auth Data Len. Set 16 for MD5 authentication data. Older ripds | |
1037 | * however expect RIP_HEADER_SIZE + RIP_AUTH_MD5_SIZE so we allow for | |
1038 | * this | |
1039 | * to be configurable. | |
1040 | */ | |
1041 | stream_putc(s, ri->md5_auth_len); | |
1042 | ||
1043 | /* Sequence Number (non-decreasing). */ | |
1044 | /* RFC2080: The value used in the sequence number is | |
1045 | arbitrary, but two suggestions are the time of the | |
1046 | message's creation or a simple message counter. */ | |
1568e88a | 1047 | stream_putl(s, ++seq); |
d62a17ae | 1048 | |
1049 | /* Reserved field must be zero. */ | |
1050 | stream_putl(s, 0); | |
1051 | stream_putl(s, 0); | |
1052 | ||
1053 | return doff; | |
b14ee00b | 1054 | } |
1055 | ||
1056 | /* If authentication is in used, write the appropriate header | |
1057 | * returns stream offset to which length must later be written | |
1058 | * or 0 if this is not required | |
1059 | */ | |
d62a17ae | 1060 | static size_t rip_auth_header_write(struct stream *s, struct rip_interface *ri, |
1061 | struct key *key, char *auth_str, int len) | |
1062 | { | |
1063 | assert(ri->auth_type != RIP_NO_AUTH); | |
1064 | ||
1065 | switch (ri->auth_type) { | |
1066 | case RIP_AUTH_SIMPLE_PASSWORD: | |
1067 | rip_auth_prepare_str_send(ri, key, auth_str, len); | |
1068 | rip_auth_simple_write(s, auth_str, len); | |
1069 | return 0; | |
1070 | case RIP_AUTH_MD5: | |
1071 | return rip_auth_md5_ah_write(s, ri, key); | |
1072 | } | |
1073 | assert(1); | |
1074 | return 0; | |
b14ee00b | 1075 | } |
1076 | ||
1077 | /* Write RIPv2 MD5 authentication data trailer */ | |
d62a17ae | 1078 | static void rip_auth_md5_set(struct stream *s, struct rip_interface *ri, |
1079 | size_t doff, char *auth_str, int authlen) | |
1080 | { | |
1081 | unsigned long len; | |
0513a271 MR |
1082 | #ifdef CRYPTO_OPENSSL |
1083 | EVP_MD_CTX *ctx; | |
1084 | #elif CRYPTO_INTERNAL | |
d62a17ae | 1085 | MD5_CTX ctx; |
0513a271 | 1086 | #endif |
d62a17ae | 1087 | unsigned char digest[RIP_AUTH_MD5_SIZE]; |
1088 | ||
1089 | /* Make it sure this interface is configured as MD5 | |
1090 | authentication. */ | |
1091 | assert((ri->auth_type == RIP_AUTH_MD5) | |
1092 | && (authlen == RIP_AUTH_MD5_SIZE)); | |
1093 | assert(doff > 0); | |
1094 | ||
1095 | /* Get packet length. */ | |
1096 | len = stream_get_endp(s); | |
1097 | ||
1098 | /* Check packet length. */ | |
1099 | if (len < (RIP_HEADER_SIZE + RIP_RTE_SIZE)) { | |
99404729 | 1100 | flog_err(EC_RIP_PACKET, |
1101 | "%s: packet length %ld is less than minimum length.", | |
1102 | __func__, len); | |
d62a17ae | 1103 | return; |
1104 | } | |
1105 | ||
1106 | /* Set the digest offset length in the header */ | |
1107 | stream_putw_at(s, doff, len); | |
1108 | ||
1109 | /* Set authentication data. */ | |
1110 | stream_putw(s, RIP_FAMILY_AUTH); | |
1111 | stream_putw(s, RIP_AUTH_DATA); | |
1112 | ||
1113 | /* Generate a digest for the RIP packet. */ | |
0513a271 MR |
1114 | #ifdef CRYPTO_OPENSSL |
1115 | unsigned int md5_size = RIP_AUTH_MD5_SIZE; | |
1116 | ctx = EVP_MD_CTX_new(); | |
1117 | EVP_DigestInit(ctx, EVP_md5()); | |
1118 | EVP_DigestUpdate(ctx, STREAM_DATA(s), stream_get_endp(s)); | |
1119 | EVP_DigestUpdate(ctx, auth_str, RIP_AUTH_MD5_SIZE); | |
1120 | EVP_DigestFinal(ctx, digest, &md5_size); | |
1121 | EVP_MD_CTX_free(ctx); | |
1122 | #elif CRYPTO_INTERNAL | |
d62a17ae | 1123 | memset(&ctx, 0, sizeof(ctx)); |
1124 | MD5Init(&ctx); | |
1125 | MD5Update(&ctx, STREAM_DATA(s), stream_get_endp(s)); | |
1126 | MD5Update(&ctx, auth_str, RIP_AUTH_MD5_SIZE); | |
1127 | MD5Final(digest, &ctx); | |
0513a271 | 1128 | #endif |
d62a17ae | 1129 | |
1130 | /* Copy the digest to the packet. */ | |
1131 | stream_write(s, digest, RIP_AUTH_MD5_SIZE); | |
718e3744 | 1132 | } |
1133 | ||
1134 | /* RIP routing information. */ | |
d62a17ae | 1135 | static void rip_response_process(struct rip_packet *packet, int size, |
1136 | struct sockaddr_in *from, | |
1137 | struct connected *ifc) | |
1138 | { | |
045c5389 RW |
1139 | struct rip_interface *ri = ifc->ifp->info; |
1140 | struct rip *rip = ri->rip; | |
d62a17ae | 1141 | caddr_t lim; |
1142 | struct rte *rte; | |
1143 | struct prefix_ipv4 ifaddr; | |
1144 | struct prefix_ipv4 ifaddrclass; | |
1145 | int subnetted; | |
1146 | ||
1147 | memset(&ifaddr, 0, sizeof(ifaddr)); | |
1148 | /* We don't know yet. */ | |
1149 | subnetted = -1; | |
1150 | ||
1151 | /* The Response must be ignored if it is not from the RIP | |
1152 | port. (RFC2453 - Sec. 3.9.2)*/ | |
1153 | if (from->sin_port != htons(RIP_PORT_DEFAULT)) { | |
1154 | zlog_info("response doesn't come from RIP port: %d", | |
1155 | from->sin_port); | |
c262df82 | 1156 | rip_peer_bad_packet(rip, ri, from); |
d62a17ae | 1157 | return; |
718e3744 | 1158 | } |
1159 | ||
d62a17ae | 1160 | /* The datagram's IPv4 source address should be checked to see |
1161 | whether the datagram is from a valid neighbor; the source of the | |
1162 | datagram must be on a directly connected network (RFC2453 - Sec. | |
1163 | 3.9.2) */ | |
ae7b826a RW |
1164 | if (if_lookup_address((void *)&from->sin_addr, AF_INET, |
1165 | rip->vrf->vrf_id) | |
d62a17ae | 1166 | == NULL) { |
1167 | zlog_info( | |
53bb7f9b MS |
1168 | "This datagram doesn't come from a valid neighbor: %pI4", |
1169 | &from->sin_addr); | |
c262df82 | 1170 | rip_peer_bad_packet(rip, ri, from); |
d62a17ae | 1171 | return; |
718e3744 | 1172 | } |
1173 | ||
d62a17ae | 1174 | /* It is also worth checking to see whether the response is from one |
1175 | of the router's own addresses. */ | |
1176 | ||
1177 | ; /* Alredy done in rip_read () */ | |
1178 | ||
1179 | /* Update RIP peer. */ | |
c262df82 | 1180 | rip_peer_update(rip, ri, from, packet->version); |
d62a17ae | 1181 | |
1182 | /* Set RTE pointer. */ | |
1183 | rte = packet->rte; | |
1184 | ||
1185 | for (lim = (caddr_t)packet + size; (caddr_t)rte < lim; rte++) { | |
1186 | /* RIPv2 authentication check. */ | |
1187 | /* If the Address Family Identifier of the first (and only the | |
1188 | first) entry in the message is 0xFFFF, then the remainder of | |
1189 | the entry contains the authentication. */ | |
1190 | /* If the packet gets here it means authentication enabled */ | |
1191 | /* Check is done in rip_read(). So, just skipping it */ | |
1192 | if (packet->version == RIPv2 && rte == packet->rte | |
1193 | && rte->family == htons(RIP_FAMILY_AUTH)) | |
1194 | continue; | |
1195 | ||
1196 | if (rte->family != htons(AF_INET)) { | |
1197 | /* Address family check. RIP only supports AF_INET. */ | |
53bb7f9b | 1198 | zlog_info("Unsupported family %d from %pI4", |
d62a17ae | 1199 | ntohs(rte->family), |
53bb7f9b | 1200 | &from->sin_addr); |
d62a17ae | 1201 | continue; |
718e3744 | 1202 | } |
d62a17ae | 1203 | |
762f54f0 | 1204 | if (packet->version == RIPv1 && rte->tag != 0) { |
1205 | zlog_warn("RIPv1 reserved field is nonzero: %d", | |
1206 | ntohs(rte->tag)); | |
1207 | continue; | |
1208 | } | |
1209 | ||
d62a17ae | 1210 | /* - is the destination address valid (e.g., unicast; not net 0 |
1211 | or 127) */ | |
1212 | if (!rip_destination_check(rte->prefix)) { | |
1213 | zlog_info( | |
1214 | "Network is net 0 or net 127 or it is not unicast network"); | |
c262df82 | 1215 | rip_peer_bad_route(rip, ri, from); |
d62a17ae | 1216 | continue; |
718e3744 | 1217 | } |
1218 | ||
d62a17ae | 1219 | /* Convert metric value to host byte order. */ |
1220 | rte->metric = ntohl(rte->metric); | |
718e3744 | 1221 | |
d62a17ae | 1222 | /* - is the metric valid (i.e., between 1 and 16, inclusive) */ |
1223 | if (!(rte->metric >= 1 && rte->metric <= 16)) { | |
1224 | zlog_info("Route's metric is not in the 1-16 range."); | |
c262df82 | 1225 | rip_peer_bad_route(rip, ri, from); |
d62a17ae | 1226 | continue; |
1227 | } | |
718e3744 | 1228 | |
d62a17ae | 1229 | /* RIPv1 does not have nexthop value. */ |
975a328e DA |
1230 | if (packet->version == RIPv1 |
1231 | && rte->nexthop.s_addr != INADDR_ANY) { | |
53bb7f9b MS |
1232 | zlog_info("RIPv1 packet with nexthop value %pI4", |
1233 | &rte->nexthop); | |
c262df82 | 1234 | rip_peer_bad_route(rip, ri, from); |
d62a17ae | 1235 | continue; |
1236 | } | |
718e3744 | 1237 | |
d62a17ae | 1238 | /* That is, if the provided information is ignored, a possibly |
1239 | sub-optimal, but absolutely valid, route may be taken. If | |
1240 | the received Next Hop is not directly reachable, it should be | |
1241 | treated as 0.0.0.0. */ | |
975a328e DA |
1242 | if (packet->version == RIPv2 |
1243 | && rte->nexthop.s_addr != INADDR_ANY) { | |
d7c0a89a | 1244 | uint32_t addrval; |
d62a17ae | 1245 | |
1246 | /* Multicast address check. */ | |
1247 | addrval = ntohl(rte->nexthop.s_addr); | |
1248 | if (IN_CLASSD(addrval)) { | |
1249 | zlog_info( | |
53bb7f9b MS |
1250 | "Nexthop %pI4 is multicast address, skip this rte", |
1251 | &rte->nexthop); | |
d62a17ae | 1252 | continue; |
1253 | } | |
1254 | ||
1255 | if (!if_lookup_address((void *)&rte->nexthop, AF_INET, | |
ae7b826a | 1256 | rip->vrf->vrf_id)) { |
d62a17ae | 1257 | struct route_node *rn; |
1258 | struct rip_info *rinfo; | |
1259 | ||
1260 | rn = route_node_match_ipv4(rip->table, | |
1261 | &rte->nexthop); | |
1262 | ||
1263 | if (rn) { | |
1264 | rinfo = rn->info; | |
1265 | ||
1266 | if (rinfo->type == ZEBRA_ROUTE_RIP | |
1267 | && rinfo->sub_type | |
1268 | == RIP_ROUTE_RTE) { | |
1269 | if (IS_RIP_DEBUG_EVENT) | |
1270 | zlog_debug( | |
53bb7f9b MS |
1271 | "Next hop %pI4 is on RIP network. Set nexthop to the packet's originator", |
1272 | &rte->nexthop); | |
d62a17ae | 1273 | rte->nexthop = rinfo->from; |
1274 | } else { | |
1275 | if (IS_RIP_DEBUG_EVENT) | |
1276 | zlog_debug( | |
53bb7f9b MS |
1277 | "Next hop %pI4 is not directly reachable. Treat it as 0.0.0.0", |
1278 | &rte->nexthop); | |
975a328e DA |
1279 | rte->nexthop.s_addr = |
1280 | INADDR_ANY; | |
d62a17ae | 1281 | } |
1282 | ||
1283 | route_unlock_node(rn); | |
1284 | } else { | |
1285 | if (IS_RIP_DEBUG_EVENT) | |
1286 | zlog_debug( | |
53bb7f9b MS |
1287 | "Next hop %pI4 is not directly reachable. Treat it as 0.0.0.0", |
1288 | &rte->nexthop); | |
975a328e | 1289 | rte->nexthop.s_addr = INADDR_ANY; |
d62a17ae | 1290 | } |
1291 | } | |
1292 | } | |
718e3744 | 1293 | |
d62a17ae | 1294 | /* For RIPv1, there won't be a valid netmask. |
91b508dc DS |
1295 | * This is a best guess at the masks. If everyone was using old |
1296 | * Ciscos before the 'ip subnet zero' option, it would be almost | |
1297 | * right too :-) | |
1298 | * | |
1299 | * Cisco summarize ripv1 advertisements to the classful boundary | |
1300 | * (/16 for class B's) except when the RIP packet does to inside | |
1301 | * the classful network in question. | |
1302 | */ | |
975a328e DA |
1303 | if ((packet->version == RIPv1 |
1304 | && rte->prefix.s_addr != INADDR_ANY) | |
d62a17ae | 1305 | || (packet->version == RIPv2 |
975a328e DA |
1306 | && (rte->prefix.s_addr != INADDR_ANY |
1307 | && rte->mask.s_addr == INADDR_ANY))) { | |
d7c0a89a | 1308 | uint32_t destination; |
d62a17ae | 1309 | |
1310 | if (subnetted == -1) { | |
f51eeb86 | 1311 | memcpy(&ifaddr, ifc->address, sizeof(ifaddr)); |
d62a17ae | 1312 | memcpy(&ifaddrclass, &ifaddr, |
f51eeb86 | 1313 | sizeof(ifaddrclass)); |
d62a17ae | 1314 | apply_classful_mask_ipv4(&ifaddrclass); |
1315 | subnetted = 0; | |
1316 | if (ifaddr.prefixlen > ifaddrclass.prefixlen) | |
1317 | subnetted = 1; | |
1318 | } | |
1319 | ||
1320 | destination = ntohl(rte->prefix.s_addr); | |
1321 | ||
1322 | if (IN_CLASSA(destination)) | |
1323 | masklen2ip(8, &rte->mask); | |
1324 | else if (IN_CLASSB(destination)) | |
1325 | masklen2ip(16, &rte->mask); | |
1326 | else if (IN_CLASSC(destination)) | |
1327 | masklen2ip(24, &rte->mask); | |
1328 | ||
1329 | if (subnetted == 1) | |
1330 | masklen2ip(ifaddrclass.prefixlen, | |
1331 | (struct in_addr *)&destination); | |
1332 | if ((subnetted == 1) | |
1333 | && ((rte->prefix.s_addr & destination) | |
1334 | == ifaddrclass.prefix.s_addr)) { | |
1335 | masklen2ip(ifaddr.prefixlen, &rte->mask); | |
1336 | if ((rte->prefix.s_addr & rte->mask.s_addr) | |
1337 | != rte->prefix.s_addr) | |
1338 | masklen2ip(32, &rte->mask); | |
1339 | if (IS_RIP_DEBUG_EVENT) | |
53bb7f9b MS |
1340 | zlog_debug("Subnetted route %pI4", |
1341 | &rte->prefix); | |
d62a17ae | 1342 | } else { |
1343 | if ((rte->prefix.s_addr & rte->mask.s_addr) | |
1344 | != rte->prefix.s_addr) | |
1345 | continue; | |
1346 | } | |
1347 | ||
1348 | if (IS_RIP_DEBUG_EVENT) { | |
53bb7f9b MS |
1349 | zlog_debug("Resultant route %pI4", |
1350 | &rte->prefix); | |
1351 | zlog_debug("Resultant mask %pI4", | |
1352 | &rte->mask); | |
d62a17ae | 1353 | } |
1354 | } | |
1355 | ||
1356 | /* In case of RIPv2, if prefix in RTE is not netmask applied one | |
1357 | ignore the entry. */ | |
975a328e DA |
1358 | if ((packet->version == RIPv2) |
1359 | && (rte->mask.s_addr != INADDR_ANY) | |
d62a17ae | 1360 | && ((rte->prefix.s_addr & rte->mask.s_addr) |
1361 | != rte->prefix.s_addr)) { | |
1362 | zlog_warn( | |
53bb7f9b MS |
1363 | "RIPv2 address %pI4 is not mask /%d applied one", |
1364 | &rte->prefix, ip_masklen(rte->mask)); | |
c262df82 | 1365 | rip_peer_bad_route(rip, ri, from); |
d62a17ae | 1366 | continue; |
1367 | } | |
1368 | ||
1369 | /* Default route's netmask is ignored. */ | |
975a328e DA |
1370 | if (packet->version == RIPv2 |
1371 | && (rte->prefix.s_addr == INADDR_ANY) | |
1372 | && (rte->mask.s_addr != INADDR_ANY)) { | |
d62a17ae | 1373 | if (IS_RIP_DEBUG_EVENT) |
1374 | zlog_debug( | |
1375 | "Default route with non-zero netmask. Set zero to netmask"); | |
975a328e | 1376 | rte->mask.s_addr = INADDR_ANY; |
d62a17ae | 1377 | } |
1378 | ||
1379 | /* Routing table updates. */ | |
1380 | rip_rte_process(rte, from, ifc->ifp); | |
718e3744 | 1381 | } |
718e3744 | 1382 | } |
1383 | ||
a4e987e0 | 1384 | /* Make socket for RIP protocol. */ |
ae7b826a | 1385 | int rip_create_socket(struct vrf *vrf) |
d62a17ae | 1386 | { |
1387 | int ret; | |
1388 | int sock; | |
1389 | struct sockaddr_in addr; | |
ae7b826a | 1390 | const char *vrf_dev = NULL; |
d62a17ae | 1391 | |
1392 | memset(&addr, 0, sizeof(struct sockaddr_in)); | |
1393 | addr.sin_family = AF_INET; | |
1394 | addr.sin_addr.s_addr = INADDR_ANY; | |
6f0e3f6e | 1395 | #ifdef HAVE_STRUCT_SOCKADDR_IN_SIN_LEN |
d62a17ae | 1396 | addr.sin_len = sizeof(struct sockaddr_in); |
6f0e3f6e | 1397 | #endif /* HAVE_STRUCT_SOCKADDR_IN_SIN_LEN */ |
d62a17ae | 1398 | /* sending port must always be the RIP port */ |
1399 | addr.sin_port = htons(RIP_PORT_DEFAULT); | |
1400 | ||
1401 | /* Make datagram socket. */ | |
ae7b826a RW |
1402 | if (vrf->vrf_id != VRF_DEFAULT) |
1403 | vrf_dev = vrf->name; | |
0cf6db21 | 1404 | frr_with_privs(&ripd_privs) { |
ae7b826a RW |
1405 | sock = vrf_socket(AF_INET, SOCK_DGRAM, IPPROTO_UDP, vrf->vrf_id, |
1406 | vrf_dev); | |
1407 | if (sock < 0) { | |
1408 | flog_err_sys(EC_LIB_SOCKET, | |
1409 | "Cannot create UDP socket: %s", | |
1410 | safe_strerror(errno)); | |
1411 | return -1; | |
1412 | } | |
d62a17ae | 1413 | } |
1414 | ||
1415 | sockopt_broadcast(sock); | |
1416 | sockopt_reuseaddr(sock); | |
1417 | sockopt_reuseport(sock); | |
1418 | setsockopt_ipv4_multicast_loop(sock, 0); | |
78b31d5c | 1419 | #ifdef IPTOS_PREC_INTERNETCONTROL |
d62a17ae | 1420 | setsockopt_ipv4_tos(sock, IPTOS_PREC_INTERNETCONTROL); |
78b31d5c | 1421 | #endif |
338b8e91 | 1422 | setsockopt_so_recvbuf(sock, RIP_UDP_RCV_BUF); |
a4e987e0 | 1423 | |
0cf6db21 | 1424 | frr_with_privs(&ripd_privs) { |
633fc9b1 DL |
1425 | if ((ret = bind(sock, (struct sockaddr *)&addr, sizeof(addr))) |
1426 | < 0) { | |
53bb7f9b MS |
1427 | zlog_err("%s: Can't bind socket %d to %pI4 port %d: %s", |
1428 | __func__, sock, &addr.sin_addr, | |
633fc9b1 DL |
1429 | (int)ntohs(addr.sin_port), |
1430 | safe_strerror(errno)); | |
d62a17ae | 1431 | |
01b9e3fd DL |
1432 | close(sock); |
1433 | return ret; | |
1434 | } | |
01b9e3fd | 1435 | } |
d62a17ae | 1436 | |
1437 | return sock; | |
a4e987e0 | 1438 | } |
1439 | ||
c49ad8f1 | 1440 | /* RIP packet send to destination address, on interface denoted by |
1441 | * by connected argument. NULL to argument denotes destination should be | |
1442 | * should be RIP multicast group | |
1443 | */ | |
d7c0a89a | 1444 | static int rip_send_packet(uint8_t *buf, int size, struct sockaddr_in *to, |
d62a17ae | 1445 | struct connected *ifc) |
1446 | { | |
045c5389 RW |
1447 | struct rip_interface *ri; |
1448 | struct rip *rip; | |
d62a17ae | 1449 | int ret; |
1450 | struct sockaddr_in sin; | |
e35356af RW |
1451 | struct msghdr msg; |
1452 | struct iovec iov; | |
1453 | #ifdef GNU_LINUX | |
1454 | struct cmsghdr *cmsgptr; | |
1455 | char adata[256] = {}; | |
1456 | struct in_pktinfo *pkt; | |
1457 | #endif /* GNU_LINUX */ | |
d62a17ae | 1458 | |
1459 | assert(ifc != NULL); | |
045c5389 RW |
1460 | ri = ifc->ifp->info; |
1461 | rip = ri->rip; | |
d62a17ae | 1462 | |
1463 | if (IS_RIP_DEBUG_PACKET) { | |
f69bd9da | 1464 | #define ADDRESS_SIZE 20 |
d62a17ae | 1465 | char dst[ADDRESS_SIZE]; |
d62a17ae | 1466 | |
1467 | if (to) { | |
53bb7f9b | 1468 | inet_ntop(AF_INET, &to->sin_addr, dst, sizeof(dst)); |
d62a17ae | 1469 | } else { |
1470 | sin.sin_addr.s_addr = htonl(INADDR_RIP_GROUP); | |
53bb7f9b | 1471 | inet_ntop(AF_INET, &sin.sin_addr, dst, sizeof(dst)); |
d62a17ae | 1472 | } |
f69bd9da | 1473 | #undef ADDRESS_SIZE |
99404729 | 1474 | zlog_debug("%s %pI4 > %s (%s)", __func__, |
1475 | &ifc->address->u.prefix4, dst, ifc->ifp->name); | |
d62a17ae | 1476 | } |
1477 | ||
1478 | if (CHECK_FLAG(ifc->flags, ZEBRA_IFA_SECONDARY)) { | |
1479 | /* | |
1480 | * ZEBRA_IFA_SECONDARY is set on linux when an interface is | |
91b508dc DS |
1481 | * configured with multiple addresses on the same |
1482 | * subnet: the first address on the subnet is configured | |
1483 | * "primary", and all subsequent addresses on that subnet | |
1484 | * are treated as "secondary" addresses. In order to avoid | |
1485 | * routing-table bloat on other rip listeners, we do not send | |
1486 | * out RIP packets with ZEBRA_IFA_SECONDARY source addrs. | |
d62a17ae | 1487 | * XXX Since Linux is the only system for which the |
91b508dc DS |
1488 | * ZEBRA_IFA_SECONDARY flag is set, we would end up |
1489 | * sending a packet for a "secondary" source address on | |
1490 | * non-linux systems. | |
d62a17ae | 1491 | */ |
1492 | if (IS_RIP_DEBUG_PACKET) | |
1493 | zlog_debug("duplicate dropped"); | |
1494 | return 0; | |
1495 | } | |
1496 | ||
1497 | /* Make destination address. */ | |
6006b807 | 1498 | memset(&sin, 0, sizeof(sin)); |
d62a17ae | 1499 | sin.sin_family = AF_INET; |
6f0e3f6e | 1500 | #ifdef HAVE_STRUCT_SOCKADDR_IN_SIN_LEN |
d62a17ae | 1501 | sin.sin_len = sizeof(struct sockaddr_in); |
6f0e3f6e | 1502 | #endif /* HAVE_STRUCT_SOCKADDR_IN_SIN_LEN */ |
718e3744 | 1503 | |
d62a17ae | 1504 | /* When destination is specified, use it's port and address. */ |
1505 | if (to) { | |
1506 | sin.sin_port = to->sin_port; | |
1507 | sin.sin_addr = to->sin_addr; | |
1508 | } else { | |
1509 | sin.sin_port = htons(RIP_PORT_DEFAULT); | |
1510 | sin.sin_addr.s_addr = htonl(INADDR_RIP_GROUP); | |
ae735d2d | 1511 | |
d62a17ae | 1512 | rip_interface_multicast_set(rip->sock, ifc); |
1513 | } | |
718e3744 | 1514 | |
e35356af RW |
1515 | memset(&msg, 0, sizeof(msg)); |
1516 | msg.msg_name = (void *)&sin; | |
1517 | msg.msg_namelen = sizeof(struct sockaddr_in); | |
1518 | msg.msg_iov = &iov; | |
1519 | msg.msg_iovlen = 1; | |
1520 | iov.iov_base = buf; | |
1521 | iov.iov_len = size; | |
1522 | ||
1523 | #ifdef GNU_LINUX | |
1524 | msg.msg_control = (void *)adata; | |
1525 | msg.msg_controllen = CMSG_SPACE(sizeof(struct in_pktinfo)); | |
1526 | ||
1527 | cmsgptr = (struct cmsghdr *)adata; | |
1528 | cmsgptr->cmsg_len = CMSG_LEN(sizeof(struct in_pktinfo)); | |
1529 | cmsgptr->cmsg_level = IPPROTO_IP; | |
1530 | cmsgptr->cmsg_type = IP_PKTINFO; | |
1531 | pkt = (struct in_pktinfo *)CMSG_DATA(cmsgptr); | |
1532 | pkt->ipi_ifindex = ifc->ifp->ifindex; | |
114918bd | 1533 | pkt->ipi_spec_dst.s_addr = ifc->address->u.prefix4.s_addr; |
e35356af RW |
1534 | #endif /* GNU_LINUX */ |
1535 | ||
1536 | ret = sendmsg(rip->sock, &msg, 0); | |
718e3744 | 1537 | |
d62a17ae | 1538 | if (IS_RIP_DEBUG_EVENT) |
fa930785 | 1539 | zlog_debug("SEND to %pI4 port %d", &sin.sin_addr, |
d62a17ae | 1540 | ntohs(sin.sin_port)); |
718e3744 | 1541 | |
d62a17ae | 1542 | if (ret < 0) |
1543 | zlog_warn("can't send packet : %s", safe_strerror(errno)); | |
718e3744 | 1544 | |
d62a17ae | 1545 | return ret; |
718e3744 | 1546 | } |
1547 | ||
1548 | /* Add redistributed route to RIP table. */ | |
045c5389 RW |
1549 | void rip_redistribute_add(struct rip *rip, int type, int sub_type, |
1550 | struct prefix_ipv4 *p, struct nexthop *nh, | |
1551 | unsigned int metric, unsigned char distance, | |
1552 | route_tag_t tag) | |
d62a17ae | 1553 | { |
1554 | int ret; | |
1555 | struct route_node *rp = NULL; | |
1556 | struct rip_info *rinfo = NULL, newinfo; | |
1557 | struct list *list = NULL; | |
1558 | ||
1559 | /* Redistribute route */ | |
1560 | ret = rip_destination_check(p->prefix); | |
1561 | if (!ret) | |
1562 | return; | |
1563 | ||
1564 | rp = route_node_get(rip->table, (struct prefix *)p); | |
1565 | ||
6006b807 | 1566 | memset(&newinfo, 0, sizeof(newinfo)); |
d62a17ae | 1567 | newinfo.type = type; |
1568 | newinfo.sub_type = sub_type; | |
d62a17ae | 1569 | newinfo.metric = 1; |
1570 | newinfo.external_metric = metric; | |
1571 | newinfo.distance = distance; | |
1572 | if (tag <= UINT16_MAX) /* RIP only supports 16 bit tags */ | |
1573 | newinfo.tag = tag; | |
1574 | newinfo.rp = rp; | |
3f5682c8 | 1575 | newinfo.nh = *nh; |
d62a17ae | 1576 | |
1577 | if ((list = rp->info) != NULL && listcount(list) != 0) { | |
1578 | rinfo = listgetdata(listhead(list)); | |
1579 | ||
1580 | if (rinfo->type == ZEBRA_ROUTE_CONNECT | |
1581 | && rinfo->sub_type == RIP_ROUTE_INTERFACE | |
1582 | && rinfo->metric != RIP_METRIC_INFINITY) { | |
1583 | route_unlock_node(rp); | |
1584 | return; | |
1585 | } | |
718e3744 | 1586 | |
d62a17ae | 1587 | /* Manually configured RIP route check. */ |
1588 | if (rinfo->type == ZEBRA_ROUTE_RIP | |
1589 | && ((rinfo->sub_type == RIP_ROUTE_STATIC) | |
1590 | || (rinfo->sub_type == RIP_ROUTE_DEFAULT))) { | |
1591 | if (type != ZEBRA_ROUTE_RIP | |
1592 | || ((sub_type != RIP_ROUTE_STATIC) | |
1593 | && (sub_type != RIP_ROUTE_DEFAULT))) { | |
1594 | route_unlock_node(rp); | |
1595 | return; | |
1596 | } | |
1597 | } | |
1598 | ||
045c5389 | 1599 | (void)rip_ecmp_replace(rip, &newinfo); |
d62a17ae | 1600 | route_unlock_node(rp); |
1601 | } else | |
045c5389 | 1602 | (void)rip_ecmp_add(rip, &newinfo); |
d62a17ae | 1603 | |
1604 | if (IS_RIP_DEBUG_EVENT) { | |
f42238f8 | 1605 | zlog_debug("Redistribute new prefix %pFX", p); |
718e3744 | 1606 | } |
1607 | ||
045c5389 | 1608 | rip_event(rip, RIP_TRIGGERED_UPDATE, 0); |
718e3744 | 1609 | } |
1610 | ||
1611 | /* Delete redistributed route from RIP table. */ | |
045c5389 RW |
1612 | void rip_redistribute_delete(struct rip *rip, int type, int sub_type, |
1613 | struct prefix_ipv4 *p, ifindex_t ifindex) | |
d62a17ae | 1614 | { |
1615 | int ret; | |
1616 | struct route_node *rp; | |
1617 | struct rip_info *rinfo; | |
1618 | ||
1619 | ret = rip_destination_check(p->prefix); | |
1620 | if (!ret) | |
1621 | return; | |
1622 | ||
1623 | rp = route_node_lookup(rip->table, (struct prefix *)p); | |
1624 | if (rp) { | |
1625 | struct list *list = rp->info; | |
1626 | ||
1627 | if (list != NULL && listcount(list) != 0) { | |
1628 | rinfo = listgetdata(listhead(list)); | |
1629 | if (rinfo != NULL && rinfo->type == type | |
1630 | && rinfo->sub_type == sub_type | |
dd127197 | 1631 | && rinfo->nh.ifindex == ifindex) { |
d62a17ae | 1632 | /* Perform poisoned reverse. */ |
1633 | rinfo->metric = RIP_METRIC_INFINITY; | |
1634 | RIP_TIMER_ON(rinfo->t_garbage_collect, | |
1635 | rip_garbage_collect, | |
1636 | rip->garbage_time); | |
e16d030c | 1637 | EVENT_OFF(rinfo->t_timeout); |
d62a17ae | 1638 | rinfo->flags |= RIP_RTF_CHANGED; |
1639 | ||
1640 | if (IS_RIP_DEBUG_EVENT) | |
1641 | zlog_debug( | |
f42238f8 DS |
1642 | "Poison %pFX on the interface %s with an infinity metric [delete]", |
1643 | p, | |
ae7b826a RW |
1644 | ifindex2ifname( |
1645 | ifindex, | |
1646 | rip->vrf->vrf_id)); | |
d62a17ae | 1647 | |
045c5389 | 1648 | rip_event(rip, RIP_TRIGGERED_UPDATE, 0); |
d62a17ae | 1649 | } |
1650 | } | |
1651 | route_unlock_node(rp); | |
1652 | } | |
718e3744 | 1653 | } |
1654 | ||
1655 | /* Response to request called from rip_read ().*/ | |
d62a17ae | 1656 | static void rip_request_process(struct rip_packet *packet, int size, |
1657 | struct sockaddr_in *from, struct connected *ifc) | |
1658 | { | |
045c5389 | 1659 | struct rip *rip; |
d62a17ae | 1660 | caddr_t lim; |
1661 | struct rte *rte; | |
1662 | struct prefix_ipv4 p; | |
1663 | struct route_node *rp; | |
1664 | struct rip_info *rinfo; | |
1665 | struct rip_interface *ri; | |
1666 | ||
1667 | /* Does not reponse to the requests on the loopback interfaces */ | |
1668 | if (if_is_loopback(ifc->ifp)) | |
1669 | return; | |
1670 | ||
1671 | /* Check RIP process is enabled on this interface. */ | |
1672 | ri = ifc->ifp->info; | |
1673 | if (!ri->running) | |
1674 | return; | |
045c5389 | 1675 | rip = ri->rip; |
d62a17ae | 1676 | |
1677 | /* When passive interface is specified, suppress responses */ | |
1678 | if (ri->passive) | |
1679 | return; | |
1680 | ||
1681 | /* RIP peer update. */ | |
c262df82 | 1682 | rip_peer_update(rip, ri, from, packet->version); |
d62a17ae | 1683 | |
1684 | lim = ((caddr_t)packet) + size; | |
1685 | rte = packet->rte; | |
1686 | ||
1687 | /* The Request is processed entry by entry. If there are no | |
1688 | entries, no response is given. */ | |
1689 | if (lim == (caddr_t)rte) | |
1690 | return; | |
1691 | ||
1692 | /* There is one special case. If there is exactly one entry in the | |
1693 | request, and it has an address family identifier of zero and a | |
1694 | metric of infinity (i.e., 16), then this is a request to send the | |
1695 | entire routing table. */ | |
1696 | if (lim == ((caddr_t)(rte + 1)) && ntohs(rte->family) == 0 | |
1697 | && ntohl(rte->metric) == RIP_METRIC_INFINITY) { | |
1698 | /* All route with split horizon */ | |
1699 | rip_output_process(ifc, from, rip_all_route, packet->version); | |
1700 | } else { | |
1701 | if (ntohs(rte->family) != AF_INET) | |
1702 | return; | |
1703 | ||
1704 | /* Examine the list of RTEs in the Request one by one. For each | |
1705 | entry, look up the destination in the router's routing | |
1706 | database and, if there is a route, put that route's metric in | |
1707 | the metric field of the RTE. If there is no explicit route | |
1708 | to the specified destination, put infinity in the metric | |
1709 | field. Once all the entries have been filled in, change the | |
1710 | command from Request to Response and send the datagram back | |
1711 | to the requestor. */ | |
1712 | p.family = AF_INET; | |
1713 | ||
1714 | for (; ((caddr_t)rte) < lim; rte++) { | |
1715 | p.prefix = rte->prefix; | |
1716 | p.prefixlen = ip_masklen(rte->mask); | |
1717 | apply_mask_ipv4(&p); | |
1718 | ||
1719 | rp = route_node_lookup(rip->table, (struct prefix *)&p); | |
1720 | if (rp) { | |
1721 | rinfo = listgetdata( | |
1722 | listhead((struct list *)rp->info)); | |
1723 | rte->metric = htonl(rinfo->metric); | |
1724 | route_unlock_node(rp); | |
1725 | } else | |
1726 | rte->metric = htonl(RIP_METRIC_INFINITY); | |
1727 | } | |
1728 | packet->command = RIP_RESPONSE; | |
4e054866 | 1729 | |
b2608623 | 1730 | (void)rip_send_packet((uint8_t *)packet, size, from, ifc); |
d62a17ae | 1731 | } |
c08a2107 | 1732 | rip->counters.queries++; |
718e3744 | 1733 | } |
1734 | ||
718e3744 | 1735 | /* First entry point of RIP packet. */ |
e6685141 | 1736 | static void rip_read(struct event *t) |
d62a17ae | 1737 | { |
e16d030c | 1738 | struct rip *rip = EVENT_ARG(t); |
d62a17ae | 1739 | int sock; |
1740 | int ret; | |
1741 | int rtenum; | |
1742 | union rip_buf rip_buf; | |
1743 | struct rip_packet *packet; | |
1744 | struct sockaddr_in from; | |
1745 | int len; | |
1746 | int vrecv; | |
1747 | socklen_t fromlen; | |
1748 | struct interface *ifp = NULL; | |
1749 | struct connected *ifc; | |
c262df82 | 1750 | struct rip_interface *ri = NULL; |
d62a17ae | 1751 | struct prefix p; |
1752 | ||
1753 | /* Fetch socket then register myself. */ | |
e16d030c | 1754 | sock = EVENT_FD(t); |
d62a17ae | 1755 | |
1756 | /* Add myself to tne next event */ | |
045c5389 | 1757 | rip_event(rip, RIP_READ, sock); |
d62a17ae | 1758 | |
1759 | /* RIPd manages only IPv4. */ | |
6006b807 | 1760 | memset(&from, 0, sizeof(from)); |
d62a17ae | 1761 | fromlen = sizeof(struct sockaddr_in); |
1762 | ||
1763 | len = recvfrom(sock, (char *)&rip_buf.buf, sizeof(rip_buf.buf), 0, | |
1764 | (struct sockaddr *)&from, &fromlen); | |
1765 | if (len < 0) { | |
ae7b826a RW |
1766 | zlog_info("recvfrom failed (VRF %s): %s", rip->vrf_name, |
1767 | safe_strerror(errno)); | |
cc9f21da | 1768 | return; |
d62a17ae | 1769 | } |
1770 | ||
1771 | /* Check is this packet comming from myself? */ | |
045c5389 | 1772 | if (if_check_address(rip, from.sin_addr)) { |
d62a17ae | 1773 | if (IS_RIP_DEBUG_PACKET) |
ae7b826a RW |
1774 | zlog_debug("ignore packet comes from myself (VRF %s)", |
1775 | rip->vrf_name); | |
cc9f21da | 1776 | return; |
d62a17ae | 1777 | } |
1778 | ||
1779 | /* Which interface is this packet comes from. */ | |
ae7b826a RW |
1780 | ifc = if_lookup_address((void *)&from.sin_addr, AF_INET, |
1781 | rip->vrf->vrf_id); | |
c262df82 | 1782 | if (ifc) { |
d62a17ae | 1783 | ifp = ifc->ifp; |
c262df82 RW |
1784 | ri = ifp->info; |
1785 | } | |
d62a17ae | 1786 | |
1787 | /* RIP packet received */ | |
1788 | if (IS_RIP_DEBUG_EVENT) | |
53bb7f9b MS |
1789 | zlog_debug("RECV packet from %pI4 port %d on %s (VRF %s)", |
1790 | &from.sin_addr, ntohs(from.sin_port), | |
ae7b826a | 1791 | ifp ? ifp->name : "unknown", rip->vrf_name); |
d62a17ae | 1792 | |
1793 | /* If this packet come from unknown interface, ignore it. */ | |
c262df82 | 1794 | if (ifp == NULL || ri == NULL) { |
d62a17ae | 1795 | zlog_info( |
99404729 | 1796 | "%s: cannot find interface for packet from %pI4 port %d (VRF %s)", |
1797 | __func__, &from.sin_addr, ntohs(from.sin_port), | |
ae7b826a | 1798 | rip->vrf_name); |
cc9f21da | 1799 | return; |
d62a17ae | 1800 | } |
1801 | ||
1802 | p.family = AF_INET; | |
1803 | p.u.prefix4 = from.sin_addr; | |
1804 | p.prefixlen = IPV4_MAX_BITLEN; | |
1805 | ||
1806 | ifc = connected_lookup_prefix(ifp, &p); | |
1807 | ||
1808 | if (ifc == NULL) { | |
1809 | zlog_info( | |
99404729 | 1810 | "%s: cannot find connected address for packet from %pI4 port %d on interface %s (VRF %s)", |
1811 | __func__, &from.sin_addr, ntohs(from.sin_port), | |
ae7b826a | 1812 | ifp->name, rip->vrf_name); |
cc9f21da | 1813 | return; |
d62a17ae | 1814 | } |
1815 | ||
1816 | /* Packet length check. */ | |
1817 | if (len < RIP_PACKET_MINSIZ) { | |
1818 | zlog_warn("packet size %d is smaller than minimum size %d", len, | |
1819 | RIP_PACKET_MINSIZ); | |
c262df82 | 1820 | rip_peer_bad_packet(rip, ri, &from); |
cc9f21da | 1821 | return; |
d62a17ae | 1822 | } |
1823 | if (len > RIP_PACKET_MAXSIZ) { | |
1824 | zlog_warn("packet size %d is larger than max size %d", len, | |
1825 | RIP_PACKET_MAXSIZ); | |
c262df82 | 1826 | rip_peer_bad_packet(rip, ri, &from); |
cc9f21da | 1827 | return; |
d62a17ae | 1828 | } |
1829 | ||
1830 | /* Packet alignment check. */ | |
1831 | if ((len - RIP_PACKET_MINSIZ) % 20) { | |
1832 | zlog_warn("packet size %d is wrong for RIP packet alignment", | |
1833 | len); | |
c262df82 | 1834 | rip_peer_bad_packet(rip, ri, &from); |
cc9f21da | 1835 | return; |
d62a17ae | 1836 | } |
1837 | ||
1838 | /* Set RTE number. */ | |
1839 | rtenum = ((len - RIP_PACKET_MINSIZ) / 20); | |
1840 | ||
1841 | /* For easy to handle. */ | |
1842 | packet = &rip_buf.rip_packet; | |
1843 | ||
1844 | /* RIP version check. */ | |
1845 | if (packet->version == 0) { | |
1846 | zlog_info("version 0 with command %d received.", | |
1847 | packet->command); | |
c262df82 | 1848 | rip_peer_bad_packet(rip, ri, &from); |
cc9f21da | 1849 | return; |
d62a17ae | 1850 | } |
1851 | ||
1852 | /* Dump RIP packet. */ | |
1853 | if (IS_RIP_DEBUG_RECV) | |
1854 | rip_packet_dump(packet, len, "RECV"); | |
1855 | ||
1856 | /* RIP version adjust. This code should rethink now. RFC1058 says | |
1857 | that "Version 1 implementations are to ignore this extra data and | |
1858 | process only the fields specified in this document.". So RIPv3 | |
1859 | packet should be treated as RIPv1 ignoring must be zero field. */ | |
1860 | if (packet->version > RIPv2) | |
1861 | packet->version = RIPv2; | |
1862 | ||
1863 | /* Is RIP running or is this RIP neighbor ?*/ | |
045c5389 | 1864 | if (!ri->running && !rip_neighbor_lookup(rip, &from)) { |
d62a17ae | 1865 | if (IS_RIP_DEBUG_EVENT) |
1866 | zlog_debug("RIP is not enabled on interface %s.", | |
1867 | ifp->name); | |
c262df82 | 1868 | rip_peer_bad_packet(rip, ri, &from); |
cc9f21da | 1869 | return; |
d62a17ae | 1870 | } |
1871 | ||
1872 | /* RIP Version check. RFC2453, 4.6 and 5.1 */ | |
1873 | vrecv = ((ri->ri_receive == RI_RIP_UNSPEC) ? rip->version_recv | |
1874 | : ri->ri_receive); | |
1875 | if (vrecv == RI_RIP_VERSION_NONE | |
1876 | || ((packet->version == RIPv1) && !(vrecv & RIPv1)) | |
1877 | || ((packet->version == RIPv2) && !(vrecv & RIPv2))) { | |
1878 | if (IS_RIP_DEBUG_PACKET) | |
1879 | zlog_debug( | |
1880 | " packet's v%d doesn't fit to if version spec", | |
1881 | packet->version); | |
c262df82 | 1882 | rip_peer_bad_packet(rip, ri, &from); |
cc9f21da | 1883 | return; |
d62a17ae | 1884 | } |
1885 | ||
1886 | /* RFC2453 5.2 If the router is not configured to authenticate RIP-2 | |
1887 | messages, then RIP-1 and unauthenticated RIP-2 messages will be | |
1888 | accepted; authenticated RIP-2 messages shall be discarded. */ | |
1889 | if ((ri->auth_type == RIP_NO_AUTH) && rtenum | |
1890 | && (packet->version == RIPv2) | |
1891 | && (packet->rte->family == htons(RIP_FAMILY_AUTH))) { | |
1892 | if (IS_RIP_DEBUG_EVENT) | |
1893 | zlog_debug( | |
1894 | "packet RIPv%d is dropped because authentication disabled", | |
1895 | packet->version); | |
fe339c95 | 1896 | ripd_notif_send_auth_type_failure(ifp->name); |
c262df82 | 1897 | rip_peer_bad_packet(rip, ri, &from); |
cc9f21da | 1898 | return; |
d62a17ae | 1899 | } |
1900 | ||
1901 | /* RFC: | |
1902 | If the router is configured to authenticate RIP-2 messages, then | |
1903 | RIP-1 messages and RIP-2 messages which pass authentication | |
1904 | testing shall be accepted; unauthenticated and failed | |
1905 | authentication RIP-2 messages shall be discarded. For maximum | |
1906 | security, RIP-1 messages should be ignored when authentication is | |
1907 | in use (see section 4.1); otherwise, the routing information from | |
1908 | authenticated messages will be propagated by RIP-1 routers in an | |
1909 | unauthenticated manner. | |
1910 | */ | |
1911 | /* We make an exception for RIPv1 REQUEST packets, to which we'll | |
1912 | * always reply regardless of authentication settings, because: | |
1913 | * | |
1914 | * - if there other authorised routers on-link, the REQUESTor can | |
1915 | * passively obtain the routing updates anyway | |
1916 | * - if there are no other authorised routers on-link, RIP can | |
1917 | * easily be disabled for the link to prevent giving out information | |
1918 | * on state of this routers RIP routing table.. | |
1919 | * | |
1920 | * I.e. if RIPv1 has any place anymore these days, it's as a very | |
1921 | * simple way to distribute routing information (e.g. to embedded | |
1922 | * hosts / appliances) and the ability to give out RIPv1 | |
1923 | * routing-information freely, while still requiring RIPv2 | |
1924 | * authentication for any RESPONSEs might be vaguely useful. | |
1925 | */ | |
1926 | if (ri->auth_type != RIP_NO_AUTH && packet->version == RIPv1) { | |
1927 | /* Discard RIPv1 messages other than REQUESTs */ | |
1928 | if (packet->command != RIP_REQUEST) { | |
1929 | if (IS_RIP_DEBUG_PACKET) | |
1930 | zlog_debug( | |
3efd0893 | 1931 | "RIPv1 dropped because authentication enabled"); |
fe339c95 | 1932 | ripd_notif_send_auth_type_failure(ifp->name); |
c262df82 | 1933 | rip_peer_bad_packet(rip, ri, &from); |
cc9f21da | 1934 | return; |
d62a17ae | 1935 | } |
1936 | } else if (ri->auth_type != RIP_NO_AUTH) { | |
1937 | const char *auth_desc; | |
1938 | ||
1939 | if (rtenum == 0) { | |
1940 | /* There definitely is no authentication in the packet. | |
1941 | */ | |
1942 | if (IS_RIP_DEBUG_PACKET) | |
1943 | zlog_debug( | |
1944 | "RIPv2 authentication failed: no auth RTE in packet"); | |
fe339c95 | 1945 | ripd_notif_send_auth_type_failure(ifp->name); |
c262df82 | 1946 | rip_peer_bad_packet(rip, ri, &from); |
cc9f21da | 1947 | return; |
d62a17ae | 1948 | } |
1949 | ||
1950 | /* First RTE must be an Authentication Family RTE */ | |
1951 | if (packet->rte->family != htons(RIP_FAMILY_AUTH)) { | |
1952 | if (IS_RIP_DEBUG_PACKET) | |
1953 | zlog_debug( | |
3efd0893 | 1954 | "RIPv2 dropped because authentication enabled"); |
fe339c95 | 1955 | ripd_notif_send_auth_type_failure(ifp->name); |
c262df82 | 1956 | rip_peer_bad_packet(rip, ri, &from); |
cc9f21da | 1957 | return; |
d62a17ae | 1958 | } |
1959 | ||
1960 | /* Check RIPv2 authentication. */ | |
1961 | switch (ntohs(packet->rte->tag)) { | |
1962 | case RIP_AUTH_SIMPLE_PASSWORD: | |
1963 | auth_desc = "simple"; | |
1964 | ret = rip_auth_simple_password(packet->rte, &from, ifp); | |
1965 | break; | |
1966 | ||
1967 | case RIP_AUTH_MD5: | |
1968 | auth_desc = "MD5"; | |
1969 | ret = rip_auth_md5(packet, &from, len, ifp); | |
1970 | /* Reset RIP packet length to trim MD5 data. */ | |
1971 | len = ret; | |
1972 | break; | |
1973 | ||
1974 | default: | |
1975 | ret = 0; | |
1976 | auth_desc = "unknown type"; | |
1977 | if (IS_RIP_DEBUG_PACKET) | |
1978 | zlog_debug( | |
1979 | "RIPv2 Unknown authentication type %d", | |
1980 | ntohs(packet->rte->tag)); | |
1981 | } | |
1982 | ||
1983 | if (ret) { | |
1984 | if (IS_RIP_DEBUG_PACKET) | |
1985 | zlog_debug("RIPv2 %s authentication success", | |
1986 | auth_desc); | |
1987 | } else { | |
1988 | if (IS_RIP_DEBUG_PACKET) | |
1989 | zlog_debug("RIPv2 %s authentication failure", | |
1990 | auth_desc); | |
fe339c95 | 1991 | ripd_notif_send_auth_failure(ifp->name); |
c262df82 | 1992 | rip_peer_bad_packet(rip, ri, &from); |
cc9f21da | 1993 | return; |
d62a17ae | 1994 | } |
1995 | } | |
1996 | ||
1997 | /* Process each command. */ | |
1998 | switch (packet->command) { | |
1999 | case RIP_RESPONSE: | |
2000 | rip_response_process(packet, len, &from, ifc); | |
2001 | break; | |
2002 | case RIP_REQUEST: | |
2003 | case RIP_POLL: | |
2004 | rip_request_process(packet, len, &from, ifc); | |
2005 | break; | |
2006 | case RIP_TRACEON: | |
2007 | case RIP_TRACEOFF: | |
2008 | zlog_info( | |
2009 | "Obsolete command %s received, please sent it to routed", | |
2010 | lookup_msg(rip_msg, packet->command, NULL)); | |
c262df82 | 2011 | rip_peer_bad_packet(rip, ri, &from); |
d62a17ae | 2012 | break; |
2013 | case RIP_POLL_ENTRY: | |
2014 | zlog_info("Obsolete command %s received", | |
2015 | lookup_msg(rip_msg, packet->command, NULL)); | |
c262df82 | 2016 | rip_peer_bad_packet(rip, ri, &from); |
d62a17ae | 2017 | break; |
2018 | default: | |
2019 | zlog_info("Unknown RIP command %d received", packet->command); | |
c262df82 | 2020 | rip_peer_bad_packet(rip, ri, &from); |
d62a17ae | 2021 | break; |
2022 | } | |
718e3744 | 2023 | } |
2024 | ||
718e3744 | 2025 | /* Write routing table entry to the stream and return next index of |
2026 | the routing table entry in the stream. */ | |
d62a17ae | 2027 | static int rip_write_rte(int num, struct stream *s, struct prefix_ipv4 *p, |
d7c0a89a | 2028 | uint8_t version, struct rip_info *rinfo) |
d62a17ae | 2029 | { |
2030 | struct in_addr mask; | |
2031 | ||
2032 | /* Write routing table entry. */ | |
2033 | if (version == RIPv1) { | |
2034 | stream_putw(s, AF_INET); | |
2035 | stream_putw(s, 0); | |
2036 | stream_put_ipv4(s, p->prefix.s_addr); | |
2037 | stream_put_ipv4(s, 0); | |
2038 | stream_put_ipv4(s, 0); | |
2039 | stream_putl(s, rinfo->metric_out); | |
2040 | } else { | |
2041 | masklen2ip(p->prefixlen, &mask); | |
2042 | ||
2043 | stream_putw(s, AF_INET); | |
2044 | stream_putw(s, rinfo->tag_out); | |
2045 | stream_put_ipv4(s, p->prefix.s_addr); | |
2046 | stream_put_ipv4(s, mask.s_addr); | |
2047 | stream_put_ipv4(s, rinfo->nexthop_out.s_addr); | |
2048 | stream_putl(s, rinfo->metric_out); | |
2049 | } | |
2050 | ||
2051 | return ++num; | |
718e3744 | 2052 | } |
2053 | ||
2054 | /* Send update to the ifp or spcified neighbor. */ | |
d62a17ae | 2055 | void rip_output_process(struct connected *ifc, struct sockaddr_in *to, |
d7c0a89a | 2056 | int route_type, uint8_t version) |
d62a17ae | 2057 | { |
045c5389 | 2058 | struct rip *rip; |
d62a17ae | 2059 | int ret; |
2060 | struct stream *s; | |
2061 | struct route_node *rp; | |
2062 | struct rip_info *rinfo; | |
2063 | struct rip_interface *ri; | |
2064 | struct prefix_ipv4 *p; | |
2065 | struct prefix_ipv4 classfull; | |
2066 | struct prefix_ipv4 ifaddrclass; | |
2067 | struct key *key = NULL; | |
2068 | /* this might need to made dynamic if RIP ever supported auth methods | |
2069 | with larger key string sizes */ | |
2070 | char auth_str[RIP_AUTH_SIMPLE_SIZE]; | |
2071 | size_t doff = 0; /* offset of digest offset field */ | |
2072 | int num = 0; | |
2073 | int rtemax; | |
2074 | int subnetted = 0; | |
2075 | struct list *list = NULL; | |
2076 | struct listnode *listnode = NULL; | |
2077 | ||
2078 | /* Logging output event. */ | |
2079 | if (IS_RIP_DEBUG_EVENT) { | |
2080 | if (to) | |
53bb7f9b MS |
2081 | zlog_debug("update routes to neighbor %pI4", |
2082 | &to->sin_addr); | |
d62a17ae | 2083 | else |
2084 | zlog_debug("update routes on interface %s ifindex %d", | |
2085 | ifc->ifp->name, ifc->ifp->ifindex); | |
2086 | } | |
718e3744 | 2087 | |
045c5389 RW |
2088 | /* Get RIP interface. */ |
2089 | ri = ifc->ifp->info; | |
2090 | rip = ri->rip; | |
2091 | ||
d62a17ae | 2092 | /* Set output stream. */ |
2093 | s = rip->obuf; | |
2094 | ||
2095 | /* Reset stream and RTE counter. */ | |
2096 | stream_reset(s); | |
2097 | rtemax = RIP_MAX_RTE; | |
2098 | ||
d62a17ae | 2099 | /* If output interface is in simple password authentication mode, we |
2100 | need space for authentication data. */ | |
2101 | if (ri->auth_type == RIP_AUTH_SIMPLE_PASSWORD) | |
2102 | rtemax -= 1; | |
2103 | ||
2104 | /* If output interface is in MD5 authentication mode, we need space | |
2105 | for authentication header and data. */ | |
2106 | if (ri->auth_type == RIP_AUTH_MD5) | |
2107 | rtemax -= 2; | |
2108 | ||
2109 | /* If output interface is in simple password authentication mode | |
2110 | and string or keychain is specified we need space for auth. data */ | |
2111 | if (ri->auth_type != RIP_NO_AUTH) { | |
2112 | if (ri->key_chain) { | |
2113 | struct keychain *keychain; | |
2114 | ||
2115 | keychain = keychain_lookup(ri->key_chain); | |
2116 | if (keychain) | |
2117 | key = key_lookup_for_send(keychain); | |
2118 | } | |
2119 | /* to be passed to auth functions later */ | |
5c84f238 | 2120 | rip_auth_prepare_str_send(ri, key, auth_str, sizeof(auth_str)); |
558c6842 | 2121 | if (strlen(auth_str) == 0) |
2122 | return; | |
d62a17ae | 2123 | } |
2124 | ||
2125 | if (version == RIPv1) { | |
f51eeb86 | 2126 | memcpy(&ifaddrclass, ifc->address, sizeof(ifaddrclass)); |
d62a17ae | 2127 | apply_classful_mask_ipv4(&ifaddrclass); |
2128 | subnetted = 0; | |
2129 | if (ifc->address->prefixlen > ifaddrclass.prefixlen) | |
2130 | subnetted = 1; | |
2131 | } | |
2132 | ||
91b508dc DS |
2133 | for (rp = route_top(rip->table); rp; rp = route_next(rp)) { |
2134 | list = rp->info; | |
d62a17ae | 2135 | |
91b508dc DS |
2136 | if (list == NULL) |
2137 | continue; | |
d62a17ae | 2138 | |
91b508dc DS |
2139 | if (listcount(list) == 0) |
2140 | continue; | |
d62a17ae | 2141 | |
91b508dc DS |
2142 | rinfo = listgetdata(listhead(list)); |
2143 | /* | |
2144 | * For RIPv1, if we are subnetted, output subnets in our | |
2145 | * network that have the same mask as the output "interface". | |
2146 | * For other networks, only the classfull version is output. | |
2147 | */ | |
2148 | if (version == RIPv1) { | |
2149 | p = (struct prefix_ipv4 *)&rp->p; | |
d62a17ae | 2150 | |
91b508dc DS |
2151 | if (IS_RIP_DEBUG_PACKET) |
2152 | zlog_debug( | |
2153 | "RIPv1 mask check, %pFX considered for output", | |
2154 | &rp->p); | |
2155 | ||
2156 | if (subnetted && | |
2157 | prefix_match((struct prefix *)&ifaddrclass, | |
2158 | &rp->p)) { | |
2159 | if ((ifc->address->prefixlen != | |
2160 | rp->p.prefixlen) && | |
2161 | (rp->p.prefixlen != IPV4_MAX_BITLEN)) | |
2162 | continue; | |
2163 | } else { | |
2164 | memcpy(&classfull, &rp->p, | |
2165 | sizeof(struct prefix_ipv4)); | |
2166 | apply_classful_mask_ipv4(&classfull); | |
2167 | if (rp->p.u.prefix4.s_addr != INADDR_ANY && | |
2168 | classfull.prefixlen != rp->p.prefixlen) | |
2169 | continue; | |
2170 | } | |
2171 | if (IS_RIP_DEBUG_PACKET) | |
2172 | zlog_debug( | |
2173 | "RIPv1 mask check, %pFX made it through", | |
2174 | &rp->p); | |
2175 | } else | |
2176 | p = (struct prefix_ipv4 *)&rp->p; | |
d62a17ae | 2177 | |
91b508dc DS |
2178 | /* Apply output filters. */ |
2179 | ret = rip_filter(RIP_FILTER_OUT, p, ri); | |
2180 | if (ret < 0) | |
2181 | continue; | |
d62a17ae | 2182 | |
91b508dc DS |
2183 | /* Changed route only output. */ |
2184 | if (route_type == rip_changed_route && | |
2185 | (!(rinfo->flags & RIP_RTF_CHANGED))) | |
2186 | continue; | |
2187 | ||
2188 | /* Split horizon. */ | |
2189 | if (ri->split_horizon == RIP_SPLIT_HORIZON) { | |
2190 | /* | |
2191 | * We perform split horizon for RIP and connected | |
2192 | * route. For rip routes, we want to suppress the | |
2193 | * route if we would end up sending the route back on | |
2194 | * the interface that we learned it from, with a | |
2195 | * higher metric. For connected routes, we suppress | |
2196 | * the route if the prefix is a subset of the source | |
2197 | * address that we are going to use for the packet | |
2198 | * (in order to handle the case when multiple subnets | |
2199 | * are configured on the same interface). | |
2200 | */ | |
2201 | int suppress = 0; | |
2202 | struct rip_info *tmp_rinfo = NULL; | |
2203 | struct connected *tmp_ifc = NULL; | |
2204 | ||
2205 | for (ALL_LIST_ELEMENTS_RO(list, listnode, tmp_rinfo)) | |
2206 | if (tmp_rinfo->type == ZEBRA_ROUTE_RIP && | |
2207 | tmp_rinfo->nh.ifindex == | |
2208 | ifc->ifp->ifindex) { | |
2209 | suppress = 1; | |
2210 | break; | |
9920df07 | 2211 | } |
d62a17ae | 2212 | |
91b508dc DS |
2213 | if (!suppress && rinfo->type == ZEBRA_ROUTE_CONNECT) { |
2214 | for (ALL_LIST_ELEMENTS_RO(ifc->ifp->connected, | |
2215 | listnode, tmp_ifc)) | |
2216 | if (prefix_match((struct prefix *)p, | |
2217 | tmp_ifc->address)) { | |
2218 | suppress = 1; | |
2219 | break; | |
2220 | } | |
d62a17ae | 2221 | } |
2222 | ||
91b508dc DS |
2223 | if (suppress) |
2224 | continue; | |
2225 | } | |
d62a17ae | 2226 | |
91b508dc DS |
2227 | /* Preparation for route-map. */ |
2228 | rinfo->metric_set = 0; | |
2229 | rinfo->nexthop_out.s_addr = 0; | |
2230 | rinfo->metric_out = rinfo->metric; | |
2231 | rinfo->tag_out = rinfo->tag; | |
2232 | rinfo->ifindex_out = ifc->ifp->ifindex; | |
2233 | ||
2234 | /* In order to avoid some local loops, if the RIP route has | |
2235 | * a nexthop via this interface, keep the nexthop, otherwise | |
2236 | * set it to 0. The nexthop should not be propagated beyond | |
2237 | * the local broadcast/multicast area in order to avoid an | |
2238 | * IGP multi-level recursive look-up. see (4.4) | |
2239 | */ | |
2240 | if (rinfo->nh.ifindex == ifc->ifp->ifindex) | |
2241 | rinfo->nexthop_out = rinfo->nh.gate.ipv4; | |
d62a17ae | 2242 | |
91b508dc DS |
2243 | /* Interface route-map */ |
2244 | if (ri->routemap[RIP_FILTER_OUT]) { | |
2245 | ret = route_map_apply(ri->routemap[RIP_FILTER_OUT], | |
2246 | (struct prefix *)p, rinfo); | |
2247 | ||
2248 | if (ret == RMAP_DENYMATCH) { | |
2249 | if (IS_RIP_DEBUG_PACKET) | |
2250 | zlog_debug( | |
2251 | "RIP %pFX is filtered by route-map out", | |
2252 | p); | |
2253 | continue; | |
d62a17ae | 2254 | } |
91b508dc | 2255 | } |
d62a17ae | 2256 | |
91b508dc DS |
2257 | /* Apply redistribute route map - continue, if deny */ |
2258 | if (rip->redist[rinfo->type].route_map.name && | |
2259 | rinfo->sub_type != RIP_ROUTE_INTERFACE) { | |
2260 | ret = route_map_apply( | |
2261 | rip->redist[rinfo->type].route_map.map, | |
2262 | (struct prefix *)p, rinfo); | |
d62a17ae | 2263 | |
91b508dc DS |
2264 | if (ret == RMAP_DENYMATCH) { |
2265 | if (IS_RIP_DEBUG_PACKET) | |
2266 | zlog_debug( | |
2267 | "%pFX is filtered by route-map", | |
2268 | p); | |
2269 | continue; | |
d62a17ae | 2270 | } |
91b508dc | 2271 | } |
d62a17ae | 2272 | |
91b508dc DS |
2273 | /* When route-map does not set metric. */ |
2274 | if (!rinfo->metric_set) { | |
2275 | /* If redistribute metric is set. */ | |
2276 | if (rip->redist[rinfo->type].metric_config && | |
2277 | rinfo->metric != RIP_METRIC_INFINITY) { | |
2278 | rinfo->metric_out = | |
2279 | rip->redist[rinfo->type].metric; | |
2280 | } else { | |
2281 | /* If the route is not connected or localy | |
2282 | * generated one, use default-metric value | |
2283 | */ | |
2284 | if (rinfo->type != ZEBRA_ROUTE_RIP && | |
2285 | rinfo->type != ZEBRA_ROUTE_CONNECT && | |
2286 | rinfo->metric != RIP_METRIC_INFINITY) | |
2287 | rinfo->metric_out = rip->default_metric; | |
d62a17ae | 2288 | } |
91b508dc | 2289 | } |
d62a17ae | 2290 | |
91b508dc DS |
2291 | /* Apply offset-list */ |
2292 | if (rinfo->metric != RIP_METRIC_INFINITY) | |
2293 | rip_offset_list_apply_out(p, ifc->ifp, | |
2294 | &rinfo->metric_out); | |
2295 | ||
2296 | if (rinfo->metric_out > RIP_METRIC_INFINITY) | |
2297 | rinfo->metric_out = RIP_METRIC_INFINITY; | |
2298 | ||
2299 | /* Perform split-horizon with poisoned reverse | |
2300 | * for RIP and connected routes. | |
2301 | **/ | |
2302 | if (ri->split_horizon == RIP_SPLIT_HORIZON_POISONED_REVERSE) { | |
2303 | /* | |
2304 | * We perform split horizon for RIP and connected | |
2305 | * route. For rip routes, we want to suppress the | |
2306 | * route if we would end up sending the route back | |
2307 | * on the interface that we learned it from, with a | |
2308 | * higher metric. For connected routes, we suppress | |
2309 | * the route if the prefix is a subset of the source | |
2310 | * address that we are going to use for the packet | |
2311 | * (in order to handle the case when multiple | |
2312 | * subnets are configured on the same interface). | |
2313 | */ | |
2314 | struct rip_info *tmp_rinfo = NULL; | |
2315 | struct connected *tmp_ifc = NULL; | |
2316 | ||
2317 | for (ALL_LIST_ELEMENTS_RO(list, listnode, tmp_rinfo)) | |
2318 | if (tmp_rinfo->type == ZEBRA_ROUTE_RIP && | |
2319 | tmp_rinfo->nh.ifindex == ifc->ifp->ifindex) | |
2320 | rinfo->metric_out = RIP_METRIC_INFINITY; | |
2321 | ||
2322 | if (rinfo->metric_out != RIP_METRIC_INFINITY && | |
2323 | rinfo->type == ZEBRA_ROUTE_CONNECT) { | |
2324 | for (ALL_LIST_ELEMENTS_RO(ifc->ifp->connected, | |
2325 | listnode, tmp_ifc)) | |
2326 | if (prefix_match((struct prefix *)p, | |
2327 | tmp_ifc->address)) { | |
9920df07 | 2328 | rinfo->metric_out = |
d62a17ae | 2329 | RIP_METRIC_INFINITY; |
91b508dc DS |
2330 | break; |
2331 | } | |
d62a17ae | 2332 | } |
91b508dc | 2333 | } |
d62a17ae | 2334 | |
91b508dc DS |
2335 | /* Prepare preamble, auth headers, if needs be */ |
2336 | if (num == 0) { | |
2337 | stream_putc(s, RIP_RESPONSE); | |
2338 | stream_putc(s, version); | |
2339 | stream_putw(s, 0); | |
2340 | ||
2341 | /* auth header for !v1 && !no_auth */ | |
2342 | if ((ri->auth_type != RIP_NO_AUTH) && | |
2343 | (version != RIPv1)) | |
2344 | doff = rip_auth_header_write( | |
2345 | s, ri, key, auth_str, | |
2346 | RIP_AUTH_SIMPLE_SIZE); | |
2347 | } | |
d62a17ae | 2348 | |
91b508dc DS |
2349 | /* Write RTE to the stream. */ |
2350 | num = rip_write_rte(num, s, p, version, rinfo); | |
2351 | if (num == rtemax) { | |
2352 | if (version == RIPv2 && ri->auth_type == RIP_AUTH_MD5) | |
2353 | rip_auth_md5_set(s, ri, doff, auth_str, | |
2354 | RIP_AUTH_SIMPLE_SIZE); | |
2355 | ||
2356 | ret = rip_send_packet(STREAM_DATA(s), | |
2357 | stream_get_endp(s), to, ifc); | |
2358 | ||
2359 | if (ret >= 0 && IS_RIP_DEBUG_SEND) | |
2360 | rip_packet_dump( | |
2361 | (struct rip_packet *)STREAM_DATA(s), | |
2362 | stream_get_endp(s), "SEND"); | |
2363 | num = 0; | |
2364 | stream_reset(s); | |
d62a17ae | 2365 | } |
91b508dc | 2366 | } |
d62a17ae | 2367 | |
2368 | /* Flush unwritten RTE. */ | |
2369 | if (num != 0) { | |
2370 | if (version == RIPv2 && ri->auth_type == RIP_AUTH_MD5) | |
2371 | rip_auth_md5_set(s, ri, doff, auth_str, | |
2372 | RIP_AUTH_SIMPLE_SIZE); | |
2373 | ||
2374 | ret = rip_send_packet(STREAM_DATA(s), stream_get_endp(s), to, | |
2375 | ifc); | |
2376 | ||
2377 | if (ret >= 0 && IS_RIP_DEBUG_SEND) | |
2378 | rip_packet_dump((struct rip_packet *)STREAM_DATA(s), | |
2379 | stream_get_endp(s), "SEND"); | |
2380 | stream_reset(s); | |
2381 | } | |
2382 | ||
2383 | /* Statistics updates. */ | |
2384 | ri->sent_updates++; | |
718e3744 | 2385 | } |
2386 | ||
2387 | /* Send RIP packet to the interface. */ | |
d7c0a89a | 2388 | static void rip_update_interface(struct connected *ifc, uint8_t version, |
d62a17ae | 2389 | int route_type) |
2390 | { | |
2391 | struct interface *ifp = ifc->ifp; | |
2392 | struct rip_interface *ri = ifp->info; | |
2393 | struct sockaddr_in to; | |
2394 | ||
2395 | /* When RIP version is 2 and multicast enable interface. */ | |
2396 | if (version == RIPv2 && !ri->v2_broadcast && if_is_multicast(ifp)) { | |
2397 | if (IS_RIP_DEBUG_EVENT) | |
2398 | zlog_debug("multicast announce on %s ", ifp->name); | |
2399 | ||
2400 | rip_output_process(ifc, NULL, route_type, version); | |
2401 | return; | |
2402 | } | |
2403 | ||
2404 | /* If we can't send multicast packet, send it with unicast. */ | |
2405 | if (if_is_broadcast(ifp) || if_is_pointopoint(ifp)) { | |
2406 | if (ifc->address->family == AF_INET) { | |
2407 | /* Destination address and port setting. */ | |
6006b807 | 2408 | memset(&to, 0, sizeof(to)); |
d62a17ae | 2409 | if (ifc->destination) |
2410 | /* use specified broadcast or peer destination | |
2411 | * addr */ | |
2412 | to.sin_addr = ifc->destination->u.prefix4; | |
936fbaef | 2413 | else if (ifc->address->prefixlen < IPV4_MAX_BITLEN) |
d62a17ae | 2414 | /* calculate the appropriate broadcast address |
2415 | */ | |
2416 | to.sin_addr.s_addr = ipv4_broadcast_addr( | |
2417 | ifc->address->u.prefix4.s_addr, | |
2418 | ifc->address->prefixlen); | |
2419 | else | |
2420 | /* do not know where to send the packet */ | |
2421 | return; | |
2422 | to.sin_port = htons(RIP_PORT_DEFAULT); | |
2423 | ||
2424 | if (IS_RIP_DEBUG_EVENT) | |
53bb7f9b | 2425 | zlog_debug("%s announce to %pI4 on %s", |
d62a17ae | 2426 | CONNECTED_PEER(ifc) ? "unicast" |
2427 | : "broadcast", | |
53bb7f9b | 2428 | &to.sin_addr, ifp->name); |
d62a17ae | 2429 | |
2430 | rip_output_process(ifc, &to, route_type, version); | |
2431 | } | |
2432 | } | |
718e3744 | 2433 | } |
2434 | ||
2435 | /* Update send to all interface and neighbor. */ | |
045c5389 | 2436 | static void rip_update_process(struct rip *rip, int route_type) |
d62a17ae | 2437 | { |
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. */ | |
ae7b826a | 2447 | FOR_ALL_INTERFACES (rip->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 | ||
91b508dc DS |
2462 | if (!ri->running) |
2463 | continue; | |
d62a17ae | 2464 | |
91b508dc DS |
2465 | /* |
2466 | * If there is no version configuration in the | |
2467 | * interface, use rip's version setting. | |
2468 | */ | |
2469 | int vsend = ((ri->ri_send == RI_RIP_UNSPEC) ? rip->version_send | |
2470 | : ri->ri_send); | |
2471 | ||
2472 | if (IS_RIP_DEBUG_EVENT) | |
2473 | zlog_debug("SEND UPDATE to %s ifindex %d", ifp->name, | |
2474 | 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(connected, RIPv1, | |
2482 | route_type); | |
2483 | if ((vsend & RIPv2) && if_is_multicast(ifp)) | |
2484 | rip_update_interface(connected, RIPv2, | |
2485 | route_type); | |
d62a17ae | 2486 | } |
2487 | } | |
2488 | } | |
2489 | ||
2490 | /* RIP send updates to each neighbor. */ | |
91b508dc DS |
2491 | for (rp = route_top(rip->neighbor); rp; rp = route_next(rp)) { |
2492 | if (rp->info == NULL) | |
2493 | continue; | |
d62a17ae | 2494 | |
91b508dc | 2495 | p = &rp->p; |
d62a17ae | 2496 | |
91b508dc DS |
2497 | connected = if_lookup_address(&p->u.prefix4, AF_INET, |
2498 | rip->vrf->vrf_id); | |
2499 | if (!connected) { | |
2500 | zlog_warn( | |
2501 | "Neighbor %pI4 doesn't have connected interface!", | |
2502 | &p->u.prefix4); | |
2503 | continue; | |
b9d92881 | 2504 | } |
91b508dc DS |
2505 | |
2506 | /* Set destination address and port */ | |
2507 | memset(&to, 0, sizeof(struct sockaddr_in)); | |
2508 | to.sin_addr = p->u.prefix4; | |
2509 | to.sin_port = htons(RIP_PORT_DEFAULT); | |
2510 | ||
2511 | /* RIP version is rip's configuration. */ | |
2512 | rip_output_process(connected, &to, route_type, | |
2513 | rip->version_send); | |
2514 | } | |
718e3744 | 2515 | } |
2516 | ||
2517 | /* RIP's periodical timer. */ | |
e6685141 | 2518 | static void rip_update(struct event *t) |
718e3744 | 2519 | { |
e16d030c | 2520 | struct rip *rip = EVENT_ARG(t); |
045c5389 | 2521 | |
d62a17ae | 2522 | if (IS_RIP_DEBUG_EVENT) |
2523 | zlog_debug("update timer fire!"); | |
718e3744 | 2524 | |
d62a17ae | 2525 | /* Process update output. */ |
045c5389 | 2526 | rip_update_process(rip, rip_all_route); |
718e3744 | 2527 | |
d62a17ae | 2528 | /* Triggered updates may be suppressed if a regular update is due by |
2529 | the time the triggered update would be sent. */ | |
e16d030c | 2530 | EVENT_OFF(rip->t_triggered_interval); |
d62a17ae | 2531 | rip->trigger = 0; |
718e3744 | 2532 | |
d62a17ae | 2533 | /* Register myself. */ |
045c5389 | 2534 | rip_event(rip, RIP_UPDATE_EVENT, 0); |
718e3744 | 2535 | } |
2536 | ||
2537 | /* Walk down the RIP routing table then clear changed flag. */ | |
045c5389 | 2538 | static void rip_clear_changed_flag(struct rip *rip) |
718e3744 | 2539 | { |
d62a17ae | 2540 | struct route_node *rp; |
2541 | struct rip_info *rinfo = NULL; | |
2542 | struct list *list = NULL; | |
2543 | struct listnode *listnode = NULL; | |
718e3744 | 2544 | |
91b508dc DS |
2545 | for (rp = route_top(rip->table); rp; rp = route_next(rp)) { |
2546 | list = rp->info; | |
2547 | ||
2548 | if (list == NULL) | |
2549 | continue; | |
2550 | ||
2551 | for (ALL_LIST_ELEMENTS_RO(list, listnode, rinfo)) { | |
2552 | UNSET_FLAG(rinfo->flags, RIP_RTF_CHANGED); | |
2553 | /* This flag can be set only on the first entry. */ | |
2554 | break; | |
2555 | } | |
2556 | } | |
718e3744 | 2557 | } |
2558 | ||
2559 | /* Triggered update interval timer. */ | |
e6685141 | 2560 | static void rip_triggered_interval(struct event *t) |
718e3744 | 2561 | { |
e16d030c | 2562 | struct rip *rip = EVENT_ARG(t); |
718e3744 | 2563 | |
d62a17ae | 2564 | if (rip->trigger) { |
2565 | rip->trigger = 0; | |
2566 | rip_triggered_update(t); | |
2567 | } | |
d62a17ae | 2568 | } |
718e3744 | 2569 | |
2570 | /* Execute triggered update. */ | |
e6685141 | 2571 | static void rip_triggered_update(struct event *t) |
718e3744 | 2572 | { |
e16d030c | 2573 | struct rip *rip = EVENT_ARG(t); |
d62a17ae | 2574 | int interval; |
718e3744 | 2575 | |
d62a17ae | 2576 | /* Cancel interval timer. */ |
e16d030c | 2577 | EVENT_OFF(rip->t_triggered_interval); |
d62a17ae | 2578 | rip->trigger = 0; |
718e3744 | 2579 | |
d62a17ae | 2580 | /* Logging triggered update. */ |
2581 | if (IS_RIP_DEBUG_EVENT) | |
2582 | zlog_debug("triggered update!"); | |
718e3744 | 2583 | |
d62a17ae | 2584 | /* Split Horizon processing is done when generating triggered |
2585 | updates as well as normal updates (see section 2.6). */ | |
045c5389 | 2586 | rip_update_process(rip, rip_changed_route); |
718e3744 | 2587 | |
d62a17ae | 2588 | /* Once all of the triggered updates have been generated, the route |
2589 | change flags should be cleared. */ | |
045c5389 | 2590 | rip_clear_changed_flag(rip); |
718e3744 | 2591 | |
d62a17ae | 2592 | /* After a triggered update is sent, a timer should be set for a |
2593 | random interval between 1 and 5 seconds. If other changes that | |
2594 | would trigger updates occur before the timer expires, a single | |
2595 | update is triggered when the timer expires. */ | |
5920b3eb | 2596 | interval = (frr_weak_random() % 5) + 1; |
718e3744 | 2597 | |
907a2395 DS |
2598 | event_add_timer(master, rip_triggered_interval, rip, interval, |
2599 | &rip->t_triggered_interval); | |
718e3744 | 2600 | } |
2601 | ||
2602 | /* Withdraw redistributed route. */ | |
045c5389 | 2603 | void rip_redistribute_withdraw(struct rip *rip, int type) |
d62a17ae | 2604 | { |
2605 | struct route_node *rp; | |
2606 | struct rip_info *rinfo = NULL; | |
2607 | struct list *list = NULL; | |
2608 | ||
91b508dc DS |
2609 | for (rp = route_top(rip->table); rp; rp = route_next(rp)) { |
2610 | list = rp->info; | |
d62a17ae | 2611 | |
91b508dc DS |
2612 | if (list == NULL) |
2613 | continue; | |
d62a17ae | 2614 | |
91b508dc | 2615 | rinfo = listgetdata(listhead(list)); |
d62a17ae | 2616 | |
91b508dc DS |
2617 | if (rinfo->type != type) |
2618 | continue; | |
2619 | ||
2620 | if (rinfo->sub_type == RIP_ROUTE_INTERFACE) | |
2621 | continue; | |
2622 | ||
2623 | /* Perform poisoned reverse. */ | |
2624 | rinfo->metric = RIP_METRIC_INFINITY; | |
2625 | RIP_TIMER_ON(rinfo->t_garbage_collect, rip_garbage_collect, | |
2626 | rip->garbage_time); | |
e16d030c | 2627 | EVENT_OFF(rinfo->t_timeout); |
91b508dc DS |
2628 | rinfo->flags |= RIP_RTF_CHANGED; |
2629 | ||
2630 | if (IS_RIP_DEBUG_EVENT) { | |
2631 | struct prefix_ipv4 *p = (struct prefix_ipv4 *)&rp->p; | |
2632 | ||
2633 | zlog_debug( | |
2634 | "Poisone %pFX on the interface %s with an infinity metric [withdraw]", | |
2635 | p, | |
2636 | ifindex2ifname(rinfo->nh.ifindex, | |
2637 | rip->vrf->vrf_id)); | |
d62a17ae | 2638 | } |
91b508dc DS |
2639 | |
2640 | rip_event(rip, RIP_TRIGGERED_UPDATE, 0); | |
2641 | } | |
d62a17ae | 2642 | } |
2643 | ||
045c5389 RW |
2644 | struct rip *rip_lookup_by_vrf_id(vrf_id_t vrf_id) |
2645 | { | |
2646 | struct vrf *vrf; | |
2647 | ||
2648 | vrf = vrf_lookup_by_id(vrf_id); | |
2649 | if (!vrf) | |
2650 | return NULL; | |
2651 | ||
2652 | return vrf->info; | |
2653 | } | |
2654 | ||
ae7b826a RW |
2655 | struct rip *rip_lookup_by_vrf_name(const char *vrf_name) |
2656 | { | |
2657 | struct rip rip; | |
2658 | ||
2659 | rip.vrf_name = (char *)vrf_name; | |
2660 | ||
2661 | return RB_FIND(rip_instance_head, &rip_instances, &rip); | |
2662 | } | |
2663 | ||
75fce464 DA |
2664 | /* Update ECMP routes to zebra when `allow-ecmp` changed. */ |
2665 | void rip_ecmp_change(struct rip *rip) | |
2666 | { | |
2667 | struct route_node *rp; | |
2668 | struct rip_info *rinfo; | |
2669 | struct list *list; | |
2670 | struct listnode *node, *nextnode; | |
2671 | ||
2672 | for (rp = route_top(rip->table); rp; rp = route_next(rp)) { | |
2673 | list = rp->info; | |
2674 | if (list && listcount(list) > 1) { | |
2675 | while (listcount(list) > rip->ecmp) { | |
2676 | struct rip_info *from_highest = NULL; | |
2677 | ||
2678 | for (ALL_LIST_ELEMENTS(list, node, nextnode, | |
2679 | rinfo)) { | |
2680 | if (!from_highest || | |
2681 | (from_highest && | |
2682 | IPV4_ADDR_CMP( | |
2683 | &rinfo->from, | |
2684 | &from_highest->from) > 0)) | |
2685 | from_highest = rinfo; | |
2686 | } | |
2687 | ||
2688 | rip_ecmp_delete(rip, from_highest); | |
2689 | } | |
2690 | } | |
2691 | } | |
2692 | } | |
2693 | ||
d62a17ae | 2694 | /* Create new RIP instance and set it to global variable. */ |
ae7b826a | 2695 | struct rip *rip_create(const char *vrf_name, struct vrf *vrf, int socket) |
718e3744 | 2696 | { |
045c5389 | 2697 | struct rip *rip; |
045c5389 | 2698 | |
d62a17ae | 2699 | rip = XCALLOC(MTYPE_RIP, sizeof(struct rip)); |
ae7b826a | 2700 | rip->vrf_name = XSTRDUP(MTYPE_RIP_VRF_NAME, vrf_name); |
718e3744 | 2701 | |
d62a17ae | 2702 | /* Set initial value. */ |
75fce464 | 2703 | rip->ecmp = yang_get_default_uint8("%s/allow-ecmp", RIP_INSTANCE); |
8c9226c2 RW |
2704 | rip->default_metric = |
2705 | yang_get_default_uint8("%s/default-metric", RIP_INSTANCE); | |
2706 | rip->distance = | |
2707 | yang_get_default_uint8("%s/distance/default", RIP_INSTANCE); | |
44f2f852 RW |
2708 | rip->passive_default = |
2709 | yang_get_default_bool("%s/passive-default", RIP_INSTANCE); | |
8c9226c2 RW |
2710 | rip->garbage_time = yang_get_default_uint32("%s/timers/flush-interval", |
2711 | RIP_INSTANCE); | |
2712 | rip->timeout_time = yang_get_default_uint32( | |
2713 | "%s/timers/holddown-interval", RIP_INSTANCE); | |
2714 | rip->update_time = yang_get_default_uint32("%s/timers/update-interval", | |
2715 | RIP_INSTANCE); | |
2716 | rip->version_send = | |
2717 | yang_get_default_enum("%s/version/send", RIP_INSTANCE); | |
2718 | rip->version_recv = | |
2719 | yang_get_default_enum("%s/version/receive", RIP_INSTANCE); | |
718e3744 | 2720 | |
ca046902 | 2721 | /* Initialize RIP data structures. */ |
d62a17ae | 2722 | rip->table = route_table_init(); |
045c5389 | 2723 | route_table_set_info(rip->table, rip); |
d62a17ae | 2724 | rip->neighbor = route_table_init(); |
29e897ad RW |
2725 | rip->peer_list = list_new(); |
2726 | rip->peer_list->cmp = (int (*)(void *, void *))rip_peer_list_cmp; | |
711915d2 | 2727 | rip->peer_list->del = rip_peer_list_del; |
2826309c RW |
2728 | rip->distance_table = route_table_init(); |
2729 | rip->distance_table->cleanup = rip_distance_table_node_cleanup; | |
ca046902 | 2730 | rip->enable_interface = vector_init(1); |
1205fdc4 | 2731 | rip->enable_network = route_table_init(); |
5a29c0d5 | 2732 | rip->passive_nondefault = vector_init(1); |
3f21c8c4 RW |
2733 | rip->offset_list_master = list_new(); |
2734 | rip->offset_list_master->cmp = (int (*)(void *, void *))offset_list_cmp; | |
6c4c3561 | 2735 | rip->offset_list_master->del = (void (*)(void *))offset_list_free; |
718e3744 | 2736 | |
2d2eaa13 | 2737 | /* Distribute list install. */ |
ae7b826a | 2738 | rip->distribute_ctx = distribute_list_ctx_create(vrf); |
2d2eaa13 RW |
2739 | distribute_list_add_hook(rip->distribute_ctx, rip_distribute_update); |
2740 | distribute_list_delete_hook(rip->distribute_ctx, rip_distribute_update); | |
2741 | ||
4b23867c | 2742 | /* if rmap install. */ |
8f88441d | 2743 | rip->if_rmap_ctx = if_rmap_ctx_create(vrf_name); |
4b23867c PG |
2744 | if_rmap_hook_add(rip->if_rmap_ctx, rip_if_rmap_update); |
2745 | if_rmap_hook_delete(rip->if_rmap_ctx, rip_if_rmap_update); | |
2746 | ||
d62a17ae | 2747 | /* Make output stream. */ |
2748 | rip->obuf = stream_new(1500); | |
16705130 | 2749 | |
ae7b826a RW |
2750 | /* Enable the routing instance if possible. */ |
2751 | if (vrf && vrf_is_enabled(vrf)) | |
2752 | rip_instance_enable(rip, vrf, socket); | |
2753 | else { | |
2754 | rip->vrf = NULL; | |
2755 | rip->sock = -1; | |
045c5389 RW |
2756 | } |
2757 | ||
ae7b826a RW |
2758 | RB_INSERT(rip_instance_head, &rip_instances, rip); |
2759 | ||
045c5389 | 2760 | return rip; |
d62a17ae | 2761 | } |
718e3744 | 2762 | |
d62a17ae | 2763 | /* Sned RIP request to the destination. */ |
2764 | int rip_request_send(struct sockaddr_in *to, struct interface *ifp, | |
d7c0a89a | 2765 | uint8_t version, struct connected *connected) |
d62a17ae | 2766 | { |
2767 | struct rte *rte; | |
2768 | struct rip_packet rip_packet; | |
2769 | struct listnode *node, *nnode; | |
2770 | ||
2771 | memset(&rip_packet, 0, sizeof(rip_packet)); | |
2772 | ||
2773 | rip_packet.command = RIP_REQUEST; | |
2774 | rip_packet.version = version; | |
2775 | rte = rip_packet.rte; | |
2776 | rte->metric = htonl(RIP_METRIC_INFINITY); | |
2777 | ||
2778 | if (connected) { | |
2779 | /* | |
2780 | * connected is only sent for ripv1 case, or when | |
2781 | * interface does not support multicast. Caller loops | |
2782 | * over each connected address for this case. | |
2783 | */ | |
d7c0a89a | 2784 | if (rip_send_packet((uint8_t *)&rip_packet, sizeof(rip_packet), |
d62a17ae | 2785 | to, connected) |
2786 | != sizeof(rip_packet)) | |
2787 | return -1; | |
2788 | else | |
2789 | return sizeof(rip_packet); | |
2790 | } | |
718e3744 | 2791 | |
d62a17ae | 2792 | /* send request on each connected network */ |
2793 | for (ALL_LIST_ELEMENTS(ifp->connected, node, nnode, connected)) { | |
2794 | struct prefix_ipv4 *p; | |
718e3744 | 2795 | |
d62a17ae | 2796 | p = (struct prefix_ipv4 *)connected->address; |
718e3744 | 2797 | |
d62a17ae | 2798 | if (p->family != AF_INET) |
2799 | continue; | |
f6eacff4 | 2800 | |
d7c0a89a | 2801 | if (rip_send_packet((uint8_t *)&rip_packet, sizeof(rip_packet), |
d62a17ae | 2802 | to, connected) |
2803 | != sizeof(rip_packet)) | |
2804 | return -1; | |
2805 | } | |
2806 | return sizeof(rip_packet); | |
718e3744 | 2807 | } |
2808 | ||
d62a17ae | 2809 | static int rip_update_jitter(unsigned long time) |
718e3744 | 2810 | { |
239389ba | 2811 | #define JITTER_BOUND 4 |
d62a17ae | 2812 | /* We want to get the jitter to +/- 1/JITTER_BOUND the interval. |
2813 | Given that, we cannot let time be less than JITTER_BOUND seconds. | |
2814 | The RIPv2 RFC says jitter should be small compared to | |
2815 | update_time. We consider 1/JITTER_BOUND to be small. | |
2816 | */ | |
2817 | ||
2818 | int jitter_input = time; | |
2819 | int jitter; | |
2820 | ||
2821 | if (jitter_input < JITTER_BOUND) | |
2822 | jitter_input = JITTER_BOUND; | |
2823 | ||
5920b3eb RZ |
2824 | jitter = (((frr_weak_random() % ((jitter_input * 2) + 1)) |
2825 | - jitter_input)); | |
d62a17ae | 2826 | |
2827 | return jitter / JITTER_BOUND; | |
2828 | } | |
2829 | ||
045c5389 | 2830 | void rip_event(struct rip *rip, enum rip_event event, int sock) |
d62a17ae | 2831 | { |
2832 | int jitter = 0; | |
2833 | ||
2834 | switch (event) { | |
2835 | case RIP_READ: | |
907a2395 | 2836 | event_add_read(master, rip_read, rip, sock, &rip->t_read); |
d62a17ae | 2837 | break; |
2838 | case RIP_UPDATE_EVENT: | |
e16d030c | 2839 | EVENT_OFF(rip->t_update); |
d62a17ae | 2840 | jitter = rip_update_jitter(rip->update_time); |
907a2395 DS |
2841 | event_add_timer(master, rip_update, rip, |
2842 | sock ? 2 : rip->update_time + jitter, | |
2843 | &rip->t_update); | |
d62a17ae | 2844 | break; |
2845 | case RIP_TRIGGERED_UPDATE: | |
2846 | if (rip->t_triggered_interval) | |
2847 | rip->trigger = 1; | |
2848 | else | |
907a2395 DS |
2849 | event_add_event(master, rip_triggered_update, rip, 0, |
2850 | &rip->t_triggered_update); | |
d62a17ae | 2851 | break; |
2852 | default: | |
2853 | break; | |
2854 | } | |
718e3744 | 2855 | } |
6b0655a2 | 2856 | |
23b23d8c | 2857 | struct rip_distance *rip_distance_new(void) |
718e3744 | 2858 | { |
d62a17ae | 2859 | return XCALLOC(MTYPE_RIP_DISTANCE, sizeof(struct rip_distance)); |
718e3744 | 2860 | } |
2861 | ||
23b23d8c | 2862 | void rip_distance_free(struct rip_distance *rdistance) |
d62a17ae | 2863 | { |
2826309c RW |
2864 | if (rdistance->access_list) |
2865 | free(rdistance->access_list); | |
d62a17ae | 2866 | XFREE(MTYPE_RIP_DISTANCE, rdistance); |
718e3744 | 2867 | } |
2868 | ||
2826309c RW |
2869 | static void rip_distance_table_node_cleanup(struct route_table *table, |
2870 | struct route_node *node) | |
d62a17ae | 2871 | { |
d62a17ae | 2872 | struct rip_distance *rdistance; |
718e3744 | 2873 | |
2826309c RW |
2874 | rdistance = node->info; |
2875 | if (rdistance) | |
2876 | rip_distance_free(rdistance); | |
d62a17ae | 2877 | } |
2878 | ||
2879 | /* Apply RIP information to distance method. */ | |
045c5389 | 2880 | uint8_t rip_distance_apply(struct rip *rip, struct rip_info *rinfo) |
d62a17ae | 2881 | { |
2882 | struct route_node *rn; | |
2883 | struct prefix_ipv4 p; | |
2884 | struct rip_distance *rdistance; | |
2885 | struct access_list *alist; | |
2886 | ||
6006b807 | 2887 | memset(&p, 0, sizeof(p)); |
d62a17ae | 2888 | p.family = AF_INET; |
2889 | p.prefix = rinfo->from; | |
2890 | p.prefixlen = IPV4_MAX_BITLEN; | |
2891 | ||
2892 | /* Check source address. */ | |
2826309c | 2893 | rn = route_node_match(rip->distance_table, (struct prefix *)&p); |
d62a17ae | 2894 | if (rn) { |
2895 | rdistance = rn->info; | |
2896 | route_unlock_node(rn); | |
2897 | ||
2898 | if (rdistance->access_list) { | |
2899 | alist = access_list_lookup(AFI_IP, | |
2900 | rdistance->access_list); | |
2901 | if (alist == NULL) | |
2902 | return 0; | |
2903 | if (access_list_apply(alist, &rinfo->rp->p) | |
2904 | == FILTER_DENY) | |
2905 | return 0; | |
b769fdc8 | 2906 | } |
2907 | return rdistance->distance; | |
718e3744 | 2908 | } |
718e3744 | 2909 | |
b769fdc8 | 2910 | return rip->distance; |
718e3744 | 2911 | } |
2912 | ||
045c5389 | 2913 | static void rip_distance_show(struct vty *vty, struct rip *rip) |
d62a17ae | 2914 | { |
2915 | struct route_node *rn; | |
2916 | struct rip_distance *rdistance; | |
2917 | int header = 1; | |
2918 | char buf[BUFSIZ]; | |
2919 | ||
7f8a9cba | 2920 | vty_out(vty, " Distance: (default is %u)\n", |
d62a17ae | 2921 | rip->distance ? rip->distance : ZEBRA_RIP_DISTANCE_DEFAULT); |
2922 | ||
91b508dc DS |
2923 | for (rn = route_top(rip->distance_table); rn; rn = route_next(rn)) { |
2924 | rdistance = rn->info; | |
2925 | ||
2926 | if (rdistance == NULL) | |
2927 | continue; | |
2928 | ||
2929 | if (header) { | |
2930 | vty_out(vty, " Address Distance List\n"); | |
2931 | header = 0; | |
d62a17ae | 2932 | } |
91b508dc DS |
2933 | snprintfrr(buf, sizeof(buf), "%pFX", &rn->p); |
2934 | vty_out(vty, " %-20s %4d %s\n", buf, rdistance->distance, | |
2935 | rdistance->access_list ? rdistance->access_list : ""); | |
2936 | } | |
718e3744 | 2937 | } |
2938 | ||
8478ae7e | 2939 | /* Update ECMP routes to zebra when ECMP is disabled. */ |
045c5389 | 2940 | void rip_ecmp_disable(struct rip *rip) |
d62a17ae | 2941 | { |
2942 | struct route_node *rp; | |
2943 | struct rip_info *rinfo, *tmp_rinfo; | |
2944 | struct list *list; | |
2945 | struct listnode *node, *nextnode; | |
2946 | ||
91b508dc DS |
2947 | for (rp = route_top(rip->table); rp; rp = route_next(rp)) { |
2948 | list = rp->info; | |
d62a17ae | 2949 | |
91b508dc DS |
2950 | if (!list) |
2951 | continue; | |
2952 | if (listcount(list) == 0) | |
2953 | continue; | |
d62a17ae | 2954 | |
91b508dc DS |
2955 | rinfo = listgetdata(listhead(list)); |
2956 | if (!rip_route_rte(rinfo)) | |
2957 | continue; | |
d62a17ae | 2958 | |
91b508dc DS |
2959 | /* Drop all other entries, except the first one. */ |
2960 | for (ALL_LIST_ELEMENTS(list, node, nextnode, tmp_rinfo)) { | |
2961 | if (tmp_rinfo == rinfo) | |
2962 | continue; | |
d62a17ae | 2963 | |
e16d030c DS |
2964 | EVENT_OFF(tmp_rinfo->t_timeout); |
2965 | EVENT_OFF(tmp_rinfo->t_garbage_collect); | |
91b508dc DS |
2966 | list_delete_node(list, node); |
2967 | rip_info_free(tmp_rinfo); | |
d62a17ae | 2968 | } |
91b508dc DS |
2969 | |
2970 | /* Update zebra. */ | |
2971 | rip_zebra_ipv4_add(rip, rp); | |
2972 | ||
2973 | /* Set the route change flag. */ | |
2974 | SET_FLAG(rinfo->flags, RIP_RTF_CHANGED); | |
2975 | ||
2976 | /* Signal the output process to trigger an update. */ | |
2977 | rip_event(rip, RIP_TRIGGERED_UPDATE, 0); | |
2978 | } | |
8478ae7e LF |
2979 | } |
2980 | ||
718e3744 | 2981 | /* Print out routes update time. */ |
d62a17ae | 2982 | static void rip_vty_out_uptime(struct vty *vty, struct rip_info *rinfo) |
718e3744 | 2983 | { |
d62a17ae | 2984 | time_t clock; |
a2700b50 | 2985 | struct tm tm; |
718e3744 | 2986 | #define TIME_BUF 25 |
d62a17ae | 2987 | char timebuf[TIME_BUF]; |
e6685141 | 2988 | struct event *thread; |
d62a17ae | 2989 | |
2990 | if ((thread = rinfo->t_timeout) != NULL) { | |
4f830a07 | 2991 | clock = event_timer_remain_second(thread); |
a2700b50 MS |
2992 | gmtime_r(&clock, &tm); |
2993 | strftime(timebuf, TIME_BUF, "%M:%S", &tm); | |
d62a17ae | 2994 | vty_out(vty, "%5s", timebuf); |
2995 | } else if ((thread = rinfo->t_garbage_collect) != NULL) { | |
4f830a07 | 2996 | clock = event_timer_remain_second(thread); |
a2700b50 MS |
2997 | gmtime_r(&clock, &tm); |
2998 | strftime(timebuf, TIME_BUF, "%M:%S", &tm); | |
d62a17ae | 2999 | vty_out(vty, "%5s", timebuf); |
3000 | } | |
3001 | } | |
3002 | ||
3003 | static const char *rip_route_type_print(int sub_type) | |
3004 | { | |
3005 | switch (sub_type) { | |
3006 | case RIP_ROUTE_RTE: | |
3007 | return "n"; | |
3008 | case RIP_ROUTE_STATIC: | |
3009 | return "s"; | |
3010 | case RIP_ROUTE_DEFAULT: | |
3011 | return "d"; | |
3012 | case RIP_ROUTE_REDISTRIBUTE: | |
3013 | return "r"; | |
3014 | case RIP_ROUTE_INTERFACE: | |
3015 | return "i"; | |
3016 | default: | |
3017 | return "?"; | |
3018 | } | |
718e3744 | 3019 | } |
3020 | ||
3021 | DEFUN (show_ip_rip, | |
3022 | show_ip_rip_cmd, | |
ae7b826a | 3023 | "show ip rip [vrf NAME]", |
718e3744 | 3024 | SHOW_STR |
3025 | IP_STR | |
ae7b826a RW |
3026 | "Show RIP routes\n" |
3027 | VRF_CMD_HELP_STR) | |
718e3744 | 3028 | { |
045c5389 | 3029 | struct rip *rip; |
d62a17ae | 3030 | struct route_node *np; |
3031 | struct rip_info *rinfo = NULL; | |
3032 | struct list *list = NULL; | |
3033 | struct listnode *listnode = NULL; | |
ae7b826a RW |
3034 | const char *vrf_name; |
3035 | int idx = 0; | |
d62a17ae | 3036 | |
ae7b826a RW |
3037 | if (argv_find(argv, argc, "vrf", &idx)) |
3038 | vrf_name = argv[idx + 1]->arg; | |
3039 | else | |
3040 | vrf_name = VRF_DEFAULT_NAME; | |
3041 | ||
3042 | rip = rip_lookup_by_vrf_name(vrf_name); | |
3043 | if (!rip) { | |
3044 | vty_out(vty, "%% RIP instance not found\n"); | |
3045 | return CMD_SUCCESS; | |
3046 | } | |
3047 | if (!rip->enabled) { | |
3048 | vty_out(vty, "%% RIP instance is disabled\n"); | |
d62a17ae | 3049 | return CMD_SUCCESS; |
ae7b826a | 3050 | } |
d62a17ae | 3051 | |
3052 | vty_out(vty, | |
3053 | "Codes: R - RIP, C - connected, S - Static, O - OSPF, B - BGP\n" | |
3054 | "Sub-codes:\n" | |
3055 | " (n) - normal, (s) - static, (d) - default, (r) - redistribute,\n" | |
3056 | " (i) - interface\n\n" | |
3057 | " Network Next Hop Metric From Tag Time\n"); | |
3058 | ||
91b508dc DS |
3059 | for (np = route_top(rip->table); np; np = route_next(np)) { |
3060 | list = np->info; | |
d62a17ae | 3061 | |
91b508dc DS |
3062 | if (!list) |
3063 | continue; | |
3064 | ||
3065 | for (ALL_LIST_ELEMENTS_RO(list, listnode, rinfo)) { | |
3066 | int len; | |
3067 | ||
3068 | len = vty_out(vty, "%c(%s) %pFX", | |
3069 | /* np->lock, For debugging. */ | |
3070 | zebra_route_char(rinfo->type), | |
3071 | rip_route_type_print(rinfo->sub_type), | |
3072 | &np->p); | |
3073 | ||
3074 | len = 24 - len; | |
3075 | ||
3076 | if (len > 0) | |
3077 | vty_out(vty, "%*s", len, " "); | |
d62a17ae | 3078 | |
91b508dc DS |
3079 | switch (rinfo->nh.type) { |
3080 | case NEXTHOP_TYPE_IPV4: | |
3081 | case NEXTHOP_TYPE_IPV4_IFINDEX: | |
3082 | vty_out(vty, "%-20pI4 %2d ", | |
3083 | &rinfo->nh.gate.ipv4, rinfo->metric); | |
3084 | break; | |
3085 | case NEXTHOP_TYPE_IFINDEX: | |
3086 | vty_out(vty, "0.0.0.0 %2d ", | |
3087 | rinfo->metric); | |
3088 | break; | |
3089 | case NEXTHOP_TYPE_BLACKHOLE: | |
3090 | vty_out(vty, "blackhole %2d ", | |
3091 | rinfo->metric); | |
3092 | break; | |
3093 | case NEXTHOP_TYPE_IPV6: | |
3094 | case NEXTHOP_TYPE_IPV6_IFINDEX: | |
3095 | vty_out(vty, "V6 Address Hidden %2d ", | |
3096 | rinfo->metric); | |
3097 | break; | |
3098 | } | |
3099 | ||
3100 | /* Route which exist in kernel routing table. */ | |
3101 | if ((rinfo->type == ZEBRA_ROUTE_RIP) && | |
3102 | (rinfo->sub_type == RIP_ROUTE_RTE)) { | |
3103 | vty_out(vty, "%-15pI4 ", &rinfo->from); | |
3104 | vty_out(vty, "%3" ROUTE_TAG_PRI " ", | |
3105 | (route_tag_t)rinfo->tag); | |
3106 | rip_vty_out_uptime(vty, rinfo); | |
3107 | } else if (rinfo->metric == RIP_METRIC_INFINITY) { | |
3108 | vty_out(vty, "self "); | |
3109 | vty_out(vty, "%3" ROUTE_TAG_PRI " ", | |
3110 | (route_tag_t)rinfo->tag); | |
3111 | rip_vty_out_uptime(vty, rinfo); | |
3112 | } else { | |
3113 | if (rinfo->external_metric) { | |
3114 | len = vty_out( | |
3115 | vty, "self (%s:%d)", | |
3116 | zebra_route_string(rinfo->type), | |
3117 | rinfo->external_metric); | |
3118 | len = 16 - len; | |
3119 | if (len > 0) | |
3120 | vty_out(vty, "%*s", len, " "); | |
3121 | } else | |
3122 | vty_out(vty, "self "); | |
3123 | vty_out(vty, "%3" ROUTE_TAG_PRI, | |
3124 | (route_tag_t)rinfo->tag); | |
d62a17ae | 3125 | } |
91b508dc DS |
3126 | |
3127 | vty_out(vty, "\n"); | |
3128 | } | |
3129 | } | |
d62a17ae | 3130 | return CMD_SUCCESS; |
718e3744 | 3131 | } |
3132 | ||
16705130 | 3133 | /* Vincent: formerly, it was show_ip_protocols_rip: "show ip protocols" */ |
3134 | DEFUN (show_ip_rip_status, | |
3135 | show_ip_rip_status_cmd, | |
ae7b826a | 3136 | "show ip rip [vrf NAME] status", |
718e3744 | 3137 | SHOW_STR |
3138 | IP_STR | |
16705130 | 3139 | "Show RIP routes\n" |
ae7b826a | 3140 | VRF_CMD_HELP_STR |
718e3744 | 3141 | "IP routing protocol process parameters and statistics\n") |
3142 | { | |
045c5389 | 3143 | struct rip *rip; |
d62a17ae | 3144 | struct interface *ifp; |
3145 | struct rip_interface *ri; | |
3146 | extern const struct message ri_version_msg[]; | |
3147 | const char *send_version; | |
3148 | const char *receive_version; | |
ae7b826a RW |
3149 | const char *vrf_name; |
3150 | int idx = 0; | |
d62a17ae | 3151 | |
ae7b826a RW |
3152 | if (argv_find(argv, argc, "vrf", &idx)) |
3153 | vrf_name = argv[idx + 1]->arg; | |
3154 | else | |
3155 | vrf_name = VRF_DEFAULT_NAME; | |
3156 | ||
3157 | rip = rip_lookup_by_vrf_name(vrf_name); | |
3158 | if (!rip) { | |
3159 | vty_out(vty, "%% RIP instance not found\n"); | |
d62a17ae | 3160 | return CMD_SUCCESS; |
ae7b826a RW |
3161 | } |
3162 | if (!rip->enabled) { | |
3163 | vty_out(vty, "%% RIP instance is disabled\n"); | |
3164 | return CMD_SUCCESS; | |
3165 | } | |
d62a17ae | 3166 | |
3167 | vty_out(vty, "Routing Protocol is \"rip\"\n"); | |
b745780b | 3168 | vty_out(vty, " Sending updates every %u seconds with +/-50%%,", |
d62a17ae | 3169 | rip->update_time); |
3170 | vty_out(vty, " next due in %lu seconds\n", | |
4f830a07 | 3171 | event_timer_remain_second(rip->t_update)); |
b745780b RW |
3172 | vty_out(vty, " Timeout after %u seconds,", rip->timeout_time); |
3173 | vty_out(vty, " garbage collect after %u seconds\n", rip->garbage_time); | |
d62a17ae | 3174 | |
3175 | /* Filtering status show. */ | |
03a38493 | 3176 | config_show_distribute(vty, rip->distribute_ctx); |
d62a17ae | 3177 | |
3178 | /* Default metric information. */ | |
282ae30c | 3179 | vty_out(vty, " Default redistribution metric is %u\n", |
d62a17ae | 3180 | rip->default_metric); |
3181 | ||
3182 | /* Redistribute information. */ | |
3183 | vty_out(vty, " Redistributing:"); | |
045c5389 | 3184 | rip_show_redistribute_config(vty, rip); |
d62a17ae | 3185 | vty_out(vty, "\n"); |
3186 | ||
3187 | vty_out(vty, " Default version control: send version %s,", | |
3188 | lookup_msg(ri_version_msg, rip->version_send, NULL)); | |
3189 | if (rip->version_recv == RI_RIP_VERSION_1_AND_2) | |
3190 | vty_out(vty, " receive any version \n"); | |
3191 | else | |
3192 | vty_out(vty, " receive version %s \n", | |
3193 | lookup_msg(ri_version_msg, rip->version_recv, NULL)); | |
3194 | ||
3195 | vty_out(vty, " Interface Send Recv Key-chain\n"); | |
3196 | ||
ae7b826a | 3197 | FOR_ALL_INTERFACES (rip->vrf, ifp) { |
d62a17ae | 3198 | ri = ifp->info; |
3199 | ||
3200 | if (!ri->running) | |
3201 | continue; | |
3202 | ||
3203 | if (ri->enable_network || ri->enable_interface) { | |
3204 | if (ri->ri_send == RI_RIP_UNSPEC) | |
3205 | send_version = | |
3206 | lookup_msg(ri_version_msg, | |
3207 | rip->version_send, NULL); | |
3208 | else | |
3209 | send_version = lookup_msg(ri_version_msg, | |
3210 | ri->ri_send, NULL); | |
3211 | ||
3212 | if (ri->ri_receive == RI_RIP_UNSPEC) | |
3213 | receive_version = | |
3214 | lookup_msg(ri_version_msg, | |
3215 | rip->version_recv, NULL); | |
3216 | else | |
3217 | receive_version = lookup_msg( | |
3218 | ri_version_msg, ri->ri_receive, NULL); | |
3219 | ||
3220 | vty_out(vty, " %-17s%-3s %-3s %s\n", ifp->name, | |
3221 | send_version, receive_version, | |
3222 | ri->key_chain ? ri->key_chain : ""); | |
3223 | } | |
3224 | } | |
718e3744 | 3225 | |
d62a17ae | 3226 | vty_out(vty, " Routing for Networks:\n"); |
045c5389 | 3227 | rip_show_network_config(vty, rip); |
718e3744 | 3228 | |
91b508dc DS |
3229 | int found_passive = 0; |
3230 | FOR_ALL_INTERFACES (rip->vrf, ifp) { | |
3231 | ri = ifp->info; | |
3232 | ||
3233 | if ((ri->enable_network || ri->enable_interface) && | |
3234 | ri->passive) { | |
3235 | if (!found_passive) { | |
3236 | vty_out(vty, " Passive Interface(s):\n"); | |
3237 | found_passive = 1; | |
d62a17ae | 3238 | } |
91b508dc | 3239 | vty_out(vty, " %s\n", ifp->name); |
d62a17ae | 3240 | } |
718e3744 | 3241 | } |
3242 | ||
d62a17ae | 3243 | vty_out(vty, " Routing Information Sources:\n"); |
3244 | vty_out(vty, | |
3245 | " Gateway BadPackets BadRoutes Distance Last Update\n"); | |
045c5389 | 3246 | rip_peer_display(vty, rip); |
718e3744 | 3247 | |
045c5389 | 3248 | rip_distance_show(vty, rip); |
718e3744 | 3249 | |
d62a17ae | 3250 | return CMD_SUCCESS; |
3251 | } | |
718e3744 | 3252 | |
d62a17ae | 3253 | /* RIP configuration write function. */ |
3254 | static int config_write_rip(struct vty *vty) | |
3255 | { | |
ae7b826a | 3256 | struct rip *rip; |
d62a17ae | 3257 | int write = 0; |
d62a17ae | 3258 | |
ae7b826a RW |
3259 | RB_FOREACH(rip, rip_instance_head, &rip_instances) { |
3260 | char xpath[XPATH_MAXLEN]; | |
3261 | struct lyd_node *dnode; | |
045c5389 | 3262 | |
ae7b826a RW |
3263 | snprintf(xpath, sizeof(xpath), |
3264 | "/frr-ripd:ripd/instance[vrf='%s']", rip->vrf_name); | |
3265 | ||
3266 | dnode = yang_dnode_get(running_config->dnode, xpath); | |
3267 | assert(dnode); | |
d62a17ae | 3268 | |
8c9226c2 RW |
3269 | nb_cli_show_dnode_cmds(vty, dnode, false); |
3270 | ||
ae7b826a RW |
3271 | /* Distribute configuration. */ |
3272 | config_write_distribute(vty, rip->distribute_ctx); | |
d62a17ae | 3273 | |
07679ad9 IR |
3274 | vty_out(vty, "exit\n"); |
3275 | ||
ae7b826a | 3276 | write = 1; |
d62a17ae | 3277 | } |
ae7b826a | 3278 | |
d62a17ae | 3279 | return write; |
3280 | } | |
718e3744 | 3281 | |
612c2c15 | 3282 | static int config_write_rip(struct vty *vty); |
d62a17ae | 3283 | /* RIP node structure. */ |
62b346ee | 3284 | static struct cmd_node rip_node = { |
f4b8291f | 3285 | .name = "rip", |
62b346ee | 3286 | .node = RIP_NODE, |
24389580 | 3287 | .parent_node = CONFIG_NODE, |
62b346ee | 3288 | .prompt = "%s(config-router)# ", |
612c2c15 | 3289 | .config_write = config_write_rip, |
62b346ee | 3290 | }; |
718e3744 | 3291 | |
d62a17ae | 3292 | /* Distribute-list update functions. */ |
03a38493 PG |
3293 | static void rip_distribute_update(struct distribute_ctx *ctx, |
3294 | struct distribute *dist) | |
d62a17ae | 3295 | { |
3296 | struct interface *ifp; | |
3297 | struct rip_interface *ri; | |
3298 | struct access_list *alist; | |
3299 | struct prefix_list *plist; | |
8478ae7e | 3300 | |
ae7b826a | 3301 | if (!ctx->vrf || !dist->ifname) |
d62a17ae | 3302 | return; |
718e3744 | 3303 | |
a36898e7 | 3304 | ifp = if_lookup_by_name(dist->ifname, ctx->vrf->vrf_id); |
d62a17ae | 3305 | if (ifp == NULL) |
3306 | return; | |
718e3744 | 3307 | |
d62a17ae | 3308 | ri = ifp->info; |
6b0655a2 | 3309 | |
d62a17ae | 3310 | if (dist->list[DISTRIBUTE_V4_IN]) { |
3311 | alist = access_list_lookup(AFI_IP, | |
3312 | dist->list[DISTRIBUTE_V4_IN]); | |
3313 | if (alist) | |
3314 | ri->list[RIP_FILTER_IN] = alist; | |
3315 | else | |
3316 | ri->list[RIP_FILTER_IN] = NULL; | |
3317 | } else | |
3318 | ri->list[RIP_FILTER_IN] = NULL; | |
3319 | ||
3320 | if (dist->list[DISTRIBUTE_V4_OUT]) { | |
3321 | alist = access_list_lookup(AFI_IP, | |
3322 | dist->list[DISTRIBUTE_V4_OUT]); | |
3323 | if (alist) | |
3324 | ri->list[RIP_FILTER_OUT] = alist; | |
3325 | else | |
3326 | ri->list[RIP_FILTER_OUT] = NULL; | |
3327 | } else | |
3328 | ri->list[RIP_FILTER_OUT] = NULL; | |
3329 | ||
3330 | if (dist->prefix[DISTRIBUTE_V4_IN]) { | |
3331 | plist = prefix_list_lookup(AFI_IP, | |
3332 | dist->prefix[DISTRIBUTE_V4_IN]); | |
3333 | if (plist) | |
3334 | ri->prefix[RIP_FILTER_IN] = plist; | |
3335 | else | |
3336 | ri->prefix[RIP_FILTER_IN] = NULL; | |
3337 | } else | |
3338 | ri->prefix[RIP_FILTER_IN] = NULL; | |
3339 | ||
3340 | if (dist->prefix[DISTRIBUTE_V4_OUT]) { | |
3341 | plist = prefix_list_lookup(AFI_IP, | |
3342 | dist->prefix[DISTRIBUTE_V4_OUT]); | |
3343 | if (plist) | |
3344 | ri->prefix[RIP_FILTER_OUT] = plist; | |
3345 | else | |
3346 | ri->prefix[RIP_FILTER_OUT] = NULL; | |
3347 | } else | |
3348 | ri->prefix[RIP_FILTER_OUT] = NULL; | |
3349 | } | |
3350 | ||
3351 | void rip_distribute_update_interface(struct interface *ifp) | |
3352 | { | |
045c5389 RW |
3353 | struct rip_interface *ri = ifp->info; |
3354 | struct rip *rip = ri->rip; | |
d62a17ae | 3355 | struct distribute *dist; |
3356 | ||
03a38493 PG |
3357 | if (!rip) |
3358 | return; | |
3359 | dist = distribute_lookup(rip->distribute_ctx, ifp->name); | |
d62a17ae | 3360 | if (dist) |
03a38493 | 3361 | rip_distribute_update(rip->distribute_ctx, dist); |
718e3744 | 3362 | } |
3363 | ||
3364 | /* Update all interface's distribute list. */ | |
02ff83c5 | 3365 | /* ARGSUSED */ |
d62a17ae | 3366 | static void rip_distribute_update_all(struct prefix_list *notused) |
718e3744 | 3367 | { |
f4e14fdb | 3368 | struct vrf *vrf = vrf_lookup_by_id(VRF_DEFAULT); |
d62a17ae | 3369 | struct interface *ifp; |
718e3744 | 3370 | |
451fda4f | 3371 | FOR_ALL_INTERFACES (vrf, ifp) |
d62a17ae | 3372 | rip_distribute_update_interface(ifp); |
718e3744 | 3373 | } |
11dde9c2 | 3374 | /* ARGSUSED */ |
d62a17ae | 3375 | static void rip_distribute_update_all_wrapper(struct access_list *notused) |
11dde9c2 | 3376 | { |
d62a17ae | 3377 | rip_distribute_update_all(NULL); |
11dde9c2 | 3378 | } |
6b0655a2 | 3379 | |
718e3744 | 3380 | /* Delete all added rip route. */ |
045c5389 | 3381 | void rip_clean(struct rip *rip) |
718e3744 | 3382 | { |
eb6b3885 IR |
3383 | rip_interfaces_clean(rip); |
3384 | ||
ae7b826a RW |
3385 | if (rip->enabled) |
3386 | rip_instance_disable(rip); | |
d62a17ae | 3387 | |
2d2eaa13 | 3388 | stream_free(rip->obuf); |
d62a17ae | 3389 | |
2d2eaa13 | 3390 | for (int i = 0; i < ZEBRA_ROUTE_MAX; i++) |
f9120f71 RW |
3391 | if (rip->redist[i].route_map.name) |
3392 | free(rip->redist[i].route_map.name); | |
2d2eaa13 RW |
3393 | |
3394 | route_table_finish(rip->table); | |
3395 | route_table_finish(rip->neighbor); | |
711915d2 | 3396 | list_delete(&rip->peer_list); |
2d2eaa13 | 3397 | distribute_list_delete(&rip->distribute_ctx); |
8f88441d | 3398 | if_rmap_ctx_delete(rip->if_rmap_ctx); |
d62a17ae | 3399 | |
045c5389 RW |
3400 | rip_clean_network(rip); |
3401 | rip_passive_nondefault_clean(rip); | |
ca046902 | 3402 | vector_free(rip->enable_interface); |
1205fdc4 | 3403 | route_table_finish(rip->enable_network); |
5a29c0d5 | 3404 | vector_free(rip->passive_nondefault); |
3f21c8c4 | 3405 | list_delete(&rip->offset_list_master); |
2826309c | 3406 | route_table_finish(rip->distance_table); |
045c5389 | 3407 | |
ae7b826a | 3408 | RB_REMOVE(rip_instance_head, &rip_instances, rip); |
c262df82 | 3409 | XFREE(MTYPE_TMP, rip->default_bfd_profile); |
ae7b826a | 3410 | XFREE(MTYPE_RIP_VRF_NAME, rip->vrf_name); |
2d2eaa13 | 3411 | XFREE(MTYPE_RIP, rip); |
718e3744 | 3412 | } |
3413 | ||
4b23867c PG |
3414 | static void rip_if_rmap_update(struct if_rmap_ctx *ctx, |
3415 | struct if_rmap *if_rmap) | |
16705130 | 3416 | { |
aec0d756 | 3417 | struct interface *ifp = NULL; |
d62a17ae | 3418 | struct rip_interface *ri; |
3419 | struct route_map *rmap; | |
aec0d756 | 3420 | struct vrf *vrf = NULL; |
16705130 | 3421 | |
aec0d756 PG |
3422 | if (ctx->name) |
3423 | vrf = vrf_lookup_by_name(ctx->name); | |
3424 | if (vrf) | |
a36898e7 | 3425 | ifp = if_lookup_by_name(if_rmap->ifname, vrf->vrf_id); |
d62a17ae | 3426 | if (ifp == NULL) |
3427 | return; | |
16705130 | 3428 | |
d62a17ae | 3429 | ri = ifp->info; |
d62a17ae | 3430 | if (if_rmap->routemap[IF_RMAP_IN]) { |
3431 | rmap = route_map_lookup_by_name(if_rmap->routemap[IF_RMAP_IN]); | |
3432 | if (rmap) | |
3433 | ri->routemap[IF_RMAP_IN] = rmap; | |
3434 | else | |
3435 | ri->routemap[IF_RMAP_IN] = NULL; | |
3436 | } else | |
3437 | ri->routemap[RIP_FILTER_IN] = NULL; | |
16705130 | 3438 | |
d62a17ae | 3439 | if (if_rmap->routemap[IF_RMAP_OUT]) { |
3440 | rmap = route_map_lookup_by_name(if_rmap->routemap[IF_RMAP_OUT]); | |
3441 | if (rmap) | |
3442 | ri->routemap[IF_RMAP_OUT] = rmap; | |
3443 | else | |
3444 | ri->routemap[IF_RMAP_OUT] = NULL; | |
3445 | } else | |
3446 | ri->routemap[RIP_FILTER_OUT] = NULL; | |
16705130 | 3447 | } |
3448 | ||
d62a17ae | 3449 | void rip_if_rmap_update_interface(struct interface *ifp) |
16705130 | 3450 | { |
8f88441d RW |
3451 | struct rip_interface *ri = ifp->info; |
3452 | struct rip *rip = ri->rip; | |
d62a17ae | 3453 | struct if_rmap *if_rmap; |
4b23867c | 3454 | struct if_rmap_ctx *ctx; |
16705130 | 3455 | |
4b23867c PG |
3456 | if (!rip) |
3457 | return; | |
4b23867c PG |
3458 | ctx = rip->if_rmap_ctx; |
3459 | if (!ctx) | |
3460 | return; | |
3461 | if_rmap = if_rmap_lookup(ctx, ifp->name); | |
d62a17ae | 3462 | if (if_rmap) |
4b23867c | 3463 | rip_if_rmap_update(ctx, if_rmap); |
16705130 | 3464 | } |
3465 | ||
045c5389 | 3466 | static void rip_routemap_update_redistribute(struct rip *rip) |
16705130 | 3467 | { |
045c5389 | 3468 | for (int i = 0; i < ZEBRA_ROUTE_MAX; i++) { |
8f88441d | 3469 | if (rip->redist[i].route_map.name) { |
f9120f71 RW |
3470 | rip->redist[i].route_map.map = route_map_lookup_by_name( |
3471 | rip->redist[i].route_map.name); | |
8f88441d RW |
3472 | route_map_counter_increment( |
3473 | rip->redist[i].route_map.map); | |
d62a17ae | 3474 | } |
16705130 | 3475 | } |
16705130 | 3476 | } |
3477 | ||
11dde9c2 | 3478 | /* ARGSUSED */ |
d62a17ae | 3479 | static void rip_routemap_update(const char *notused) |
16705130 | 3480 | { |
f4e14fdb | 3481 | struct vrf *vrf = vrf_lookup_by_id(VRF_DEFAULT); |
045c5389 | 3482 | struct rip *rip; |
d62a17ae | 3483 | struct interface *ifp; |
16705130 | 3484 | |
451fda4f | 3485 | FOR_ALL_INTERFACES (vrf, ifp) |
d62a17ae | 3486 | rip_if_rmap_update_interface(ifp); |
16705130 | 3487 | |
045c5389 RW |
3488 | rip = vrf->info; |
3489 | if (rip) | |
3490 | rip_routemap_update_redistribute(rip); | |
16705130 | 3491 | } |
3492 | ||
ae7b826a RW |
3493 | /* Link RIP instance to VRF. */ |
3494 | static void rip_vrf_link(struct rip *rip, struct vrf *vrf) | |
3495 | { | |
3496 | struct interface *ifp; | |
3497 | ||
3498 | rip->vrf = vrf; | |
3499 | rip->distribute_ctx->vrf = vrf; | |
3500 | vrf->info = rip; | |
3501 | ||
3502 | FOR_ALL_INTERFACES (vrf, ifp) | |
3503 | rip_interface_sync(ifp); | |
3504 | } | |
3505 | ||
3506 | /* Unlink RIP instance from VRF. */ | |
3507 | static void rip_vrf_unlink(struct rip *rip, struct vrf *vrf) | |
3508 | { | |
3509 | struct interface *ifp; | |
3510 | ||
3511 | rip->vrf = NULL; | |
3512 | rip->distribute_ctx->vrf = NULL; | |
3513 | vrf->info = NULL; | |
3514 | ||
3515 | FOR_ALL_INTERFACES (vrf, ifp) | |
3516 | rip_interface_sync(ifp); | |
3517 | } | |
3518 | ||
3519 | static void rip_instance_enable(struct rip *rip, struct vrf *vrf, int sock) | |
3520 | { | |
3521 | rip->sock = sock; | |
3522 | ||
3523 | rip_vrf_link(rip, vrf); | |
3524 | rip->enabled = true; | |
3525 | ||
f9120f71 RW |
3526 | /* Resend all redistribute requests. */ |
3527 | rip_redistribute_enable(rip); | |
3528 | ||
ae7b826a RW |
3529 | /* Create read and timer thread. */ |
3530 | rip_event(rip, RIP_READ, rip->sock); | |
3531 | rip_event(rip, RIP_UPDATE_EVENT, 1); | |
3532 | ||
3533 | rip_zebra_vrf_register(vrf); | |
3534 | } | |
3535 | ||
3536 | static void rip_instance_disable(struct rip *rip) | |
3537 | { | |
3538 | struct vrf *vrf = rip->vrf; | |
3539 | struct route_node *rp; | |
3540 | ||
3541 | /* Clear RIP routes */ | |
3542 | for (rp = route_top(rip->table); rp; rp = route_next(rp)) { | |
3543 | struct rip_info *rinfo; | |
3544 | struct list *list; | |
3545 | struct listnode *listnode; | |
3546 | ||
3547 | if ((list = rp->info) == NULL) | |
3548 | continue; | |
3549 | ||
3550 | rinfo = listgetdata(listhead(list)); | |
3551 | if (rip_route_rte(rinfo)) | |
3552 | rip_zebra_ipv4_delete(rip, rp); | |
3553 | ||
3554 | for (ALL_LIST_ELEMENTS_RO(list, listnode, rinfo)) { | |
e16d030c DS |
3555 | EVENT_OFF(rinfo->t_timeout); |
3556 | EVENT_OFF(rinfo->t_garbage_collect); | |
ae7b826a RW |
3557 | rip_info_free(rinfo); |
3558 | } | |
3559 | list_delete(&list); | |
3560 | rp->info = NULL; | |
3561 | route_unlock_node(rp); | |
3562 | } | |
3563 | ||
f9120f71 RW |
3564 | /* Flush all redistribute requests. */ |
3565 | rip_redistribute_disable(rip); | |
3566 | ||
ae7b826a | 3567 | /* Cancel RIP related timers. */ |
e16d030c DS |
3568 | EVENT_OFF(rip->t_update); |
3569 | EVENT_OFF(rip->t_triggered_update); | |
3570 | EVENT_OFF(rip->t_triggered_interval); | |
ae7b826a RW |
3571 | |
3572 | /* Cancel read thread. */ | |
e16d030c | 3573 | EVENT_OFF(rip->t_read); |
ae7b826a RW |
3574 | |
3575 | /* Close RIP socket. */ | |
3576 | close(rip->sock); | |
3577 | rip->sock = -1; | |
3578 | ||
3579 | /* Clear existing peers. */ | |
3580 | list_delete_all_node(rip->peer_list); | |
3581 | ||
3582 | rip_zebra_vrf_deregister(vrf); | |
3583 | ||
3584 | rip_vrf_unlink(rip, vrf); | |
3585 | rip->enabled = false; | |
3586 | } | |
3587 | ||
3588 | static int rip_vrf_new(struct vrf *vrf) | |
3589 | { | |
3590 | if (IS_RIP_DEBUG_EVENT) | |
3591 | zlog_debug("%s: VRF created: %s(%u)", __func__, vrf->name, | |
3592 | vrf->vrf_id); | |
3593 | ||
3594 | return 0; | |
3595 | } | |
3596 | ||
3597 | static int rip_vrf_delete(struct vrf *vrf) | |
3598 | { | |
3d1588d8 DS |
3599 | struct rip *rip; |
3600 | ||
ae7b826a RW |
3601 | if (IS_RIP_DEBUG_EVENT) |
3602 | zlog_debug("%s: VRF deleted: %s(%u)", __func__, vrf->name, | |
3603 | vrf->vrf_id); | |
3604 | ||
3d1588d8 DS |
3605 | rip = rip_lookup_by_vrf_name(vrf->name); |
3606 | if (!rip) | |
3607 | return 0; | |
3608 | ||
3609 | rip_clean(rip); | |
3610 | ||
ae7b826a RW |
3611 | return 0; |
3612 | } | |
3613 | ||
3614 | static int rip_vrf_enable(struct vrf *vrf) | |
3615 | { | |
3616 | struct rip *rip; | |
3617 | int socket; | |
3618 | ||
3619 | rip = rip_lookup_by_vrf_name(vrf->name); | |
3620 | if (!rip || rip->enabled) | |
3621 | return 0; | |
3622 | ||
3623 | if (IS_RIP_DEBUG_EVENT) | |
3624 | zlog_debug("%s: VRF %s(%u) enabled", __func__, vrf->name, | |
3625 | vrf->vrf_id); | |
3626 | ||
3627 | /* Activate the VRF RIP instance. */ | |
3628 | if (!rip->enabled) { | |
3629 | socket = rip_create_socket(vrf); | |
3630 | if (socket < 0) | |
3631 | return -1; | |
3632 | ||
3633 | rip_instance_enable(rip, vrf, socket); | |
3634 | } | |
3635 | ||
3636 | return 0; | |
3637 | } | |
3638 | ||
3639 | static int rip_vrf_disable(struct vrf *vrf) | |
3640 | { | |
3641 | struct rip *rip; | |
3642 | ||
3643 | rip = rip_lookup_by_vrf_name(vrf->name); | |
3644 | if (!rip || !rip->enabled) | |
3645 | return 0; | |
3646 | ||
3647 | if (IS_RIP_DEBUG_EVENT) | |
3648 | zlog_debug("%s: VRF %s(%u) disabled", __func__, vrf->name, | |
3649 | vrf->vrf_id); | |
3650 | ||
3651 | /* Deactivate the VRF RIP instance. */ | |
3652 | if (rip->enabled) | |
3653 | rip_instance_disable(rip); | |
3654 | ||
3655 | return 0; | |
3656 | } | |
3657 | ||
3658 | void rip_vrf_init(void) | |
3659 | { | |
ac2cb9bf | 3660 | vrf_init(rip_vrf_new, rip_vrf_enable, rip_vrf_disable, rip_vrf_delete); |
f5eef2d5 | 3661 | |
cfc369c4 | 3662 | vrf_cmd_init(NULL); |
ae7b826a RW |
3663 | } |
3664 | ||
3665 | void rip_vrf_terminate(void) | |
3666 | { | |
3667 | vrf_terminate(); | |
3668 | } | |
3669 | ||
718e3744 | 3670 | /* Allocate new rip structure and set default value. */ |
d62a17ae | 3671 | void rip_init(void) |
3672 | { | |
3673 | /* Install top nodes. */ | |
612c2c15 | 3674 | install_node(&rip_node); |
d62a17ae | 3675 | |
3676 | /* Install rip commands. */ | |
3677 | install_element(VIEW_NODE, &show_ip_rip_cmd); | |
3678 | install_element(VIEW_NODE, &show_ip_rip_status_cmd); | |
d62a17ae | 3679 | |
3680 | install_default(RIP_NODE); | |
d62a17ae | 3681 | |
3682 | /* Debug related init. */ | |
3683 | rip_debug_init(); | |
3684 | ||
3685 | /* Access list install. */ | |
3686 | access_list_init(); | |
3687 | access_list_add_hook(rip_distribute_update_all_wrapper); | |
3688 | access_list_delete_hook(rip_distribute_update_all_wrapper); | |
3689 | ||
3690 | /* Prefix list initialize.*/ | |
3691 | prefix_list_init(); | |
3692 | prefix_list_add_hook(rip_distribute_update_all); | |
3693 | prefix_list_delete_hook(rip_distribute_update_all); | |
3694 | ||
d62a17ae | 3695 | /* Route-map */ |
3696 | rip_route_map_init(); | |
d62a17ae | 3697 | |
3698 | route_map_add_hook(rip_routemap_update); | |
3699 | route_map_delete_hook(rip_routemap_update); | |
3700 | ||
3701 | if_rmap_init(RIP_NODE); | |
718e3744 | 3702 | } |