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7f57883e DS |
1 | /* |
2 | * EIGRP Interface Functions. | |
3 | * Copyright (C) 2013-2016 | |
4 | * Authors: | |
5 | * Donnie Savage | |
6 | * Jan Janovic | |
7 | * Matej Perina | |
8 | * Peter Orsag | |
9 | * Peter Paluch | |
10 | * Frantisek Gazo | |
11 | * Tomas Hvorkovy | |
12 | * Martin Kontsek | |
13 | * Lukas Koribsky | |
14 | * | |
15 | * This file is part of GNU Zebra. | |
16 | * | |
17 | * GNU Zebra is free software; you can redistribute it and/or modify it | |
18 | * under the terms of the GNU General Public License as published by the | |
19 | * Free Software Foundation; either version 2, or (at your option) any | |
20 | * later version. | |
21 | * | |
22 | * GNU Zebra is distributed in the hope that it will be useful, but | |
23 | * WITHOUT ANY WARRANTY; without even the implied warranty of | |
24 | * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU | |
25 | * General Public License for more details. | |
26 | * | |
896014f4 DL |
27 | * You should have received a copy of the GNU General Public License along |
28 | * with this program; see the file COPYING; if not, write to the Free Software | |
29 | * Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA | |
7f57883e DS |
30 | */ |
31 | ||
32 | #include <zebra.h> | |
33 | ||
34 | #include "thread.h" | |
35 | #include "linklist.h" | |
36 | #include "prefix.h" | |
37 | #include "if.h" | |
38 | #include "table.h" | |
39 | #include "memory.h" | |
40 | #include "command.h" | |
41 | #include "stream.h" | |
42 | #include "log.h" | |
43 | #include "keychain.h" | |
44 | #include "vrf.h" | |
45 | ||
46 | #include "eigrpd/eigrp_structs.h" | |
47 | #include "eigrpd/eigrpd.h" | |
48 | #include "eigrpd/eigrp_interface.h" | |
49 | #include "eigrpd/eigrp_neighbor.h" | |
50 | #include "eigrpd/eigrp_packet.h" | |
51 | #include "eigrpd/eigrp_zebra.h" | |
52 | #include "eigrpd/eigrp_vty.h" | |
53 | #include "eigrpd/eigrp_network.h" | |
54 | #include "eigrpd/eigrp_topology.h" | |
55 | #include "eigrpd/eigrp_memory.h" | |
348addb4 | 56 | #include "eigrpd/eigrp_fsm.h" |
ddbf3e60 | 57 | #include "eigrpd/eigrp_dump.h" |
e9f1847e DS |
58 | #include "eigrpd/eigrp_types.h" |
59 | #include "eigrpd/eigrp_metric.h" | |
7f57883e | 60 | |
d62a17ae | 61 | struct eigrp_interface *eigrp_if_new(struct eigrp *eigrp, struct interface *ifp, |
62 | struct prefix *p) | |
7f57883e | 63 | { |
b748db67 | 64 | struct eigrp_interface *ei = ifp->info; |
d62a17ae | 65 | int i; |
7f57883e | 66 | |
b748db67 | 67 | if (ei) |
d62a17ae | 68 | return ei; |
7f57883e | 69 | |
b748db67 DS |
70 | ei = XCALLOC(MTYPE_EIGRP_IF, sizeof(struct eigrp_interface)); |
71 | ||
d62a17ae | 72 | /* Set zebra interface pointer. */ |
73 | ei->ifp = ifp; | |
b245781a | 74 | prefix_copy(&ei->address, p); |
7f57883e | 75 | |
b748db67 | 76 | ifp->info = ei; |
d62a17ae | 77 | listnode_add(eigrp->eiflist, ei); |
7f57883e | 78 | |
d62a17ae | 79 | ei->type = EIGRP_IFTYPE_BROADCAST; |
7f57883e | 80 | |
d62a17ae | 81 | /* Initialize neighbor list. */ |
82 | ei->nbrs = list_new(); | |
7f57883e | 83 | |
d62a17ae | 84 | ei->crypt_seqnum = time(NULL); |
7f57883e | 85 | |
d62a17ae | 86 | /* Initialize lists */ |
87 | for (i = 0; i < EIGRP_FILTER_MAX; i++) { | |
88 | ei->list[i] = NULL; | |
89 | ei->prefix[i] = NULL; | |
90 | ei->routemap[i] = NULL; | |
91 | } | |
7f57883e | 92 | |
b748db67 | 93 | ei->eigrp = eigrp; |
7f57883e | 94 | |
b748db67 DS |
95 | ei->params.v_hello = EIGRP_HELLO_INTERVAL_DEFAULT; |
96 | ei->params.v_wait = EIGRP_HOLD_INTERVAL_DEFAULT; | |
97 | ei->params.bandwidth = EIGRP_BANDWIDTH_DEFAULT; | |
98 | ei->params.delay = EIGRP_DELAY_DEFAULT; | |
99 | ei->params.reliability = EIGRP_RELIABILITY_DEFAULT; | |
100 | ei->params.load = EIGRP_LOAD_DEFAULT; | |
101 | ei->params.auth_type = EIGRP_AUTH_TYPE_NONE; | |
102 | ei->params.auth_keychain = NULL; | |
7f57883e | 103 | |
85d25587 DS |
104 | ei->curr_bandwidth = ifp->bandwidth; |
105 | ei->curr_mtu = ifp->mtu; | |
106 | ||
b748db67 | 107 | return ei; |
7f57883e DS |
108 | } |
109 | ||
d62a17ae | 110 | int eigrp_if_delete_hook(struct interface *ifp) |
7f57883e | 111 | { |
b748db67 DS |
112 | struct eigrp_interface *ei = ifp->info; |
113 | struct eigrp *eigrp; | |
7f57883e | 114 | |
b748db67 DS |
115 | if (!ei) |
116 | return 0; | |
117 | ||
6a154c88 | 118 | list_delete(&ei->nbrs); |
7f57883e | 119 | |
b748db67 DS |
120 | eigrp = ei->eigrp; |
121 | listnode_delete(eigrp->eiflist, ei); | |
7f57883e | 122 | |
c45db77d DS |
123 | eigrp_fifo_free(ei->obuf); |
124 | ||
d62a17ae | 125 | XFREE(MTYPE_EIGRP_IF_INFO, ifp->info); |
7f57883e | 126 | |
d62a17ae | 127 | return 0; |
7f57883e DS |
128 | } |
129 | ||
138c5a74 DS |
130 | static int eigrp_ifp_create(struct interface *ifp) |
131 | { | |
ef7bd2a3 DS |
132 | struct eigrp_interface *ei = ifp->info; |
133 | ||
134 | if (!ei) | |
135 | return 0; | |
136 | ||
137 | ei->params.type = eigrp_default_iftype(ifp); | |
138 | ||
139 | eigrp_if_update(ifp); | |
140 | ||
138c5a74 DS |
141 | return 0; |
142 | } | |
143 | ||
144 | static int eigrp_ifp_up(struct interface *ifp) | |
145 | { | |
85d25587 | 146 | struct eigrp_interface *ei = ifp->info; |
ddbf3e60 DS |
147 | |
148 | if (IS_DEBUG_EIGRP(zebra, ZEBRA_INTERFACE)) | |
149 | zlog_debug("Zebra: Interface[%s] state change to up.", | |
150 | ifp->name); | |
151 | ||
85d25587 DS |
152 | if (!ei) |
153 | return 0; | |
154 | ||
155 | if (ei->curr_bandwidth != ifp->bandwidth) { | |
156 | if (IS_DEBUG_EIGRP(zebra, ZEBRA_INTERFACE)) | |
157 | zlog_debug( | |
158 | "Zebra: Interface[%s] bandwidth change %d -> %d.", | |
159 | ifp->name, ei->curr_bandwidth, | |
160 | ifp->bandwidth); | |
161 | ||
162 | ei->curr_bandwidth = ifp->bandwidth; | |
163 | // eigrp_if_recalculate_output_cost (ifp); | |
164 | } | |
165 | ||
166 | if (ei->curr_mtu != ifp->mtu) { | |
167 | if (IS_DEBUG_EIGRP(zebra, ZEBRA_INTERFACE)) | |
168 | zlog_debug( | |
169 | "Zebra: Interface[%s] MTU change %u -> %u.", | |
170 | ifp->name, ei->curr_mtu, ifp->mtu); | |
171 | ||
172 | ei->curr_mtu = ifp->mtu; | |
173 | /* Must reset the interface (simulate down/up) when MTU | |
174 | * changes. */ | |
175 | eigrp_if_reset(ifp); | |
176 | return 0; | |
177 | } | |
178 | ||
179 | eigrp_if_up(ifp->info); | |
ddbf3e60 | 180 | |
138c5a74 DS |
181 | return 0; |
182 | } | |
183 | ||
184 | static int eigrp_ifp_down(struct interface *ifp) | |
185 | { | |
b0b69e59 DS |
186 | if (IS_DEBUG_EIGRP(zebra, ZEBRA_INTERFACE)) |
187 | zlog_debug("Zebra: Interface[%s] state change to down.", | |
188 | ifp->name); | |
189 | ||
190 | if (ifp->info) | |
191 | eigrp_if_down(ifp->info); | |
192 | ||
138c5a74 DS |
193 | return 0; |
194 | } | |
195 | ||
196 | static int eigrp_ifp_destroy(struct interface *ifp) | |
197 | { | |
3c3c3252 DS |
198 | if (if_is_up(ifp)) |
199 | zlog_warn("Zebra: got delete of %s, but interface is still up", | |
200 | ifp->name); | |
201 | ||
202 | if (IS_DEBUG_EIGRP(zebra, ZEBRA_INTERFACE)) | |
203 | zlog_debug( | |
204 | "Zebra: interface delete %s index %d flags %llx metric %d mtu %d", | |
205 | ifp->name, ifp->ifindex, (unsigned long long)ifp->flags, | |
206 | ifp->metric, ifp->mtu); | |
207 | ||
208 | if (ifp->info) | |
209 | eigrp_if_free(ifp->info, INTERFACE_DOWN_BY_ZEBRA); | |
210 | ||
138c5a74 DS |
211 | return 0; |
212 | } | |
213 | ||
7f57883e DS |
214 | struct list *eigrp_iflist; |
215 | ||
4d762f26 | 216 | void eigrp_if_init(void) |
7f57883e | 217 | { |
138c5a74 DS |
218 | if_zapi_callbacks(eigrp_ifp_create, eigrp_ifp_up, |
219 | eigrp_ifp_down, eigrp_ifp_destroy); | |
d62a17ae | 220 | /* Initialize Zebra interface data structure. */ |
996c9314 | 221 | // hook_register_prio(if_add, 0, eigrp_if_new); |
ce19a04a | 222 | hook_register_prio(if_del, 0, eigrp_if_delete_hook); |
7f57883e DS |
223 | } |
224 | ||
7f57883e | 225 | |
d62a17ae | 226 | void eigrp_del_if_params(struct eigrp_if_params *eip) |
7f57883e | 227 | { |
d62a17ae | 228 | if (eip->auth_keychain) |
229 | free(eip->auth_keychain); | |
7f57883e DS |
230 | } |
231 | ||
7c6ff2c5 DS |
232 | /* |
233 | * Set the network byte order of the 3 bytes we send | |
234 | * of the mtu of the link. | |
235 | */ | |
236 | static void eigrp_mtu_convert(struct eigrp_metrics *metric, uint32_t host_mtu) | |
237 | { | |
238 | uint32_t network_mtu = htonl(host_mtu); | |
239 | uint8_t *nm = (uint8_t *)&network_mtu; | |
240 | ||
241 | metric->mtu[0] = nm[1]; | |
242 | metric->mtu[1] = nm[2]; | |
243 | metric->mtu[2] = nm[3]; | |
244 | } | |
245 | ||
d62a17ae | 246 | int eigrp_if_up(struct eigrp_interface *ei) |
7f57883e | 247 | { |
dc4accdd DS |
248 | struct eigrp_prefix_descriptor *pe; |
249 | struct eigrp_route_descriptor *ne; | |
d62a17ae | 250 | struct eigrp_metrics metric; |
251 | struct eigrp_interface *ei2; | |
252 | struct listnode *node, *nnode; | |
dbfd865b | 253 | struct eigrp *eigrp; |
d62a17ae | 254 | |
255 | if (ei == NULL) | |
256 | return 0; | |
257 | ||
dbfd865b DS |
258 | eigrp = ei->eigrp; |
259 | eigrp_adjust_sndbuflen(eigrp, ei->ifp->mtu); | |
260 | ||
d62a17ae | 261 | eigrp_if_stream_set(ei); |
262 | ||
263 | /* Set multicast memberships appropriately for new state. */ | |
264 | eigrp_if_set_multicast(ei); | |
265 | ||
266 | thread_add_event(master, eigrp_hello_timer, ei, (1), NULL); | |
267 | ||
268 | /*Prepare metrics*/ | |
996c9314 | 269 | metric.bandwidth = eigrp_bandwidth_to_scaled(ei->params.bandwidth); |
b748db67 DS |
270 | metric.delay = eigrp_delay_to_scaled(ei->params.delay); |
271 | metric.load = ei->params.load; | |
272 | metric.reliability = ei->params.reliability; | |
7c6ff2c5 | 273 | eigrp_mtu_convert(&metric, ei->ifp->mtu); |
d62a17ae | 274 | metric.hop_count = 0; |
275 | metric.flags = 0; | |
276 | metric.tag = 0; | |
277 | ||
278 | /*Add connected entry to topology table*/ | |
279 | ||
dc4accdd | 280 | ne = eigrp_route_descriptor_new(); |
348addb4 DS |
281 | ne->ei = ei; |
282 | ne->reported_metric = metric; | |
283 | ne->total_metric = metric; | |
284 | ne->distance = eigrp_calculate_metrics(eigrp, metric); | |
285 | ne->reported_distance = 0; | |
286 | ne->adv_router = eigrp->neighbor_self; | |
dc4accdd | 287 | ne->flags = EIGRP_ROUTE_DESCRIPTOR_SUCCESSOR_FLAG; |
348addb4 | 288 | |
02b45998 | 289 | struct prefix dest_addr; |
d62a17ae | 290 | |
b245781a | 291 | dest_addr = ei->address; |
02b45998 | 292 | apply_mask(&dest_addr); |
d62a17ae | 293 | pe = eigrp_topology_table_lookup_ipv4(eigrp->topology_table, |
476a1469 | 294 | &dest_addr); |
d62a17ae | 295 | |
296 | if (pe == NULL) { | |
dc4accdd | 297 | pe = eigrp_prefix_descriptor_new(); |
d62a17ae | 298 | pe->serno = eigrp->serno; |
02b45998 DS |
299 | pe->destination = (struct prefix *)prefix_ipv4_new(); |
300 | prefix_copy(pe->destination, &dest_addr); | |
d62a17ae | 301 | pe->af = AF_INET; |
302 | pe->nt = EIGRP_TOPOLOGY_TYPE_CONNECTED; | |
303 | ||
348addb4 | 304 | ne->prefix = pe; |
cd6c573c | 305 | pe->reported_metric = metric; |
d62a17ae | 306 | pe->state = EIGRP_FSM_STATE_PASSIVE; |
307 | pe->fdistance = eigrp_calculate_metrics(eigrp, metric); | |
308 | pe->req_action |= EIGRP_FSM_NEED_UPDATE; | |
dc4accdd | 309 | eigrp_prefix_descriptor_add(eigrp->topology_table, pe); |
d62a17ae | 310 | listnode_add(eigrp->topology_changes_internalIPV4, pe); |
d62a17ae | 311 | |
dc4accdd | 312 | eigrp_route_descriptor_add(eigrp, pe, ne); |
d62a17ae | 313 | |
348addb4 DS |
314 | for (ALL_LIST_ELEMENTS(eigrp->eiflist, node, nnode, ei2)) { |
315 | eigrp_update_send(ei2); | |
316 | } | |
317 | ||
318 | pe->req_action &= ~EIGRP_FSM_NEED_UPDATE; | |
319 | listnode_delete(eigrp->topology_changes_internalIPV4, pe); | |
320 | } else { | |
321 | struct eigrp_fsm_action_message msg; | |
322 | ||
323 | ne->prefix = pe; | |
dc4accdd | 324 | eigrp_route_descriptor_add(eigrp, pe, ne); |
348addb4 DS |
325 | |
326 | msg.packet_type = EIGRP_OPC_UPDATE; | |
327 | msg.eigrp = eigrp; | |
328 | msg.data_type = EIGRP_CONNECTED; | |
329 | msg.adv_router = NULL; | |
330 | msg.entry = ne; | |
331 | msg.prefix = pe; | |
332 | ||
333 | eigrp_fsm_event(&msg); | |
334 | } | |
d62a17ae | 335 | |
336 | return 1; | |
7f57883e DS |
337 | } |
338 | ||
d62a17ae | 339 | int eigrp_if_down(struct eigrp_interface *ei) |
7f57883e | 340 | { |
d62a17ae | 341 | struct listnode *node, *nnode; |
342 | struct eigrp_neighbor *nbr; | |
7f57883e | 343 | |
d62a17ae | 344 | if (ei == NULL) |
345 | return 0; | |
7f57883e | 346 | |
d62a17ae | 347 | /* Shutdown packet reception and sending */ |
28ef0ee1 | 348 | THREAD_OFF(ei->t_hello); |
7f57883e | 349 | |
d62a17ae | 350 | eigrp_if_stream_unset(ei); |
7f57883e | 351 | |
d62a17ae | 352 | /*Set infinite metrics to routes learned by this interface and start |
353 | * query process*/ | |
354 | for (ALL_LIST_ELEMENTS(ei->nbrs, node, nnode, nbr)) { | |
355 | eigrp_nbr_delete(nbr); | |
356 | } | |
7f57883e | 357 | |
d62a17ae | 358 | return 1; |
7f57883e DS |
359 | } |
360 | ||
d62a17ae | 361 | void eigrp_if_stream_set(struct eigrp_interface *ei) |
7f57883e | 362 | { |
d62a17ae | 363 | /* set output fifo queue. */ |
364 | if (ei->obuf == NULL) | |
365 | ei->obuf = eigrp_fifo_new(); | |
7f57883e DS |
366 | } |
367 | ||
d62a17ae | 368 | void eigrp_if_stream_unset(struct eigrp_interface *ei) |
7f57883e | 369 | { |
d62a17ae | 370 | struct eigrp *eigrp = ei->eigrp; |
371 | ||
c45db77d DS |
372 | if (ei->on_write_q) { |
373 | listnode_delete(eigrp->oi_write_q, ei); | |
374 | if (list_isempty(eigrp->oi_write_q)) | |
b3d6bc6e | 375 | thread_cancel(&(eigrp->t_write)); |
c45db77d | 376 | ei->on_write_q = 0; |
d62a17ae | 377 | } |
7f57883e DS |
378 | } |
379 | ||
b748db67 DS |
380 | bool eigrp_if_is_passive(struct eigrp_interface *ei) |
381 | { | |
382 | if (ei->params.passive_interface == EIGRP_IF_ACTIVE) | |
383 | return false; | |
384 | ||
385 | if (ei->eigrp->passive_interface_default == EIGRP_IF_ACTIVE) | |
386 | return false; | |
387 | ||
388 | return true; | |
389 | } | |
390 | ||
d62a17ae | 391 | void eigrp_if_set_multicast(struct eigrp_interface *ei) |
7f57883e | 392 | { |
b748db67 | 393 | if (!eigrp_if_is_passive(ei)) { |
d62a17ae | 394 | /* The interface should belong to the EIGRP-all-routers group. |
395 | */ | |
b748db67 | 396 | if (!ei->member_allrouters |
b245781a | 397 | && (eigrp_if_add_allspfrouters(ei->eigrp, &ei->address, |
d62a17ae | 398 | ei->ifp->ifindex) |
399 | >= 0)) | |
400 | /* Set the flag only if the system call to join | |
401 | * succeeded. */ | |
b748db67 | 402 | ei->member_allrouters = true; |
d62a17ae | 403 | } else { |
404 | /* The interface should NOT belong to the EIGRP-all-routers | |
405 | * group. */ | |
b748db67 | 406 | if (ei->member_allrouters) { |
d62a17ae | 407 | /* Only actually drop if this is the last reference */ |
b245781a | 408 | eigrp_if_drop_allspfrouters(ei->eigrp, &ei->address, |
b748db67 | 409 | ei->ifp->ifindex); |
d62a17ae | 410 | /* Unset the flag regardless of whether the system call |
411 | to leave | |
412 | the group succeeded, since it's much safer to assume | |
413 | that | |
414 | we are not a member. */ | |
b748db67 | 415 | ei->member_allrouters = false; |
d62a17ae | 416 | } |
417 | } | |
7f57883e DS |
418 | } |
419 | ||
d7c0a89a | 420 | uint8_t eigrp_default_iftype(struct interface *ifp) |
7f57883e | 421 | { |
d62a17ae | 422 | if (if_is_pointopoint(ifp)) |
423 | return EIGRP_IFTYPE_POINTOPOINT; | |
424 | else if (if_is_loopback(ifp)) | |
425 | return EIGRP_IFTYPE_LOOPBACK; | |
426 | else | |
427 | return EIGRP_IFTYPE_BROADCAST; | |
7f57883e DS |
428 | } |
429 | ||
996c9314 | 430 | void eigrp_if_free(struct eigrp_interface *ei, int source) |
7f57883e | 431 | { |
476a1469 | 432 | struct prefix dest_addr; |
dc4accdd | 433 | struct eigrp_prefix_descriptor *pe; |
e9449961 | 434 | struct eigrp *eigrp = ei->eigrp; |
0bf75bd5 | 435 | |
d62a17ae | 436 | if (source == INTERFACE_DOWN_BY_VTY) { |
50478845 | 437 | thread_cancel(&ei->t_hello); |
d62a17ae | 438 | eigrp_hello_send(ei, EIGRP_HELLO_GRACEFUL_SHUTDOWN, NULL); |
439 | } | |
440 | ||
b245781a | 441 | dest_addr = ei->address; |
476a1469 | 442 | apply_mask(&dest_addr); |
d62a17ae | 443 | pe = eigrp_topology_table_lookup_ipv4(eigrp->topology_table, |
444 | &dest_addr); | |
445 | if (pe) | |
dc4accdd DS |
446 | eigrp_prefix_descriptor_delete(eigrp, eigrp->topology_table, |
447 | pe); | |
d62a17ae | 448 | |
449 | eigrp_if_down(ei); | |
450 | ||
d62a17ae | 451 | listnode_delete(ei->eigrp->eiflist, ei); |
7f57883e DS |
452 | } |
453 | ||
454 | /* Simulate down/up on the interface. This is needed, for example, when | |
f9e5c9ca | 455 | the MTU changes. */ |
d62a17ae | 456 | void eigrp_if_reset(struct interface *ifp) |
7f57883e | 457 | { |
b748db67 | 458 | struct eigrp_interface *ei = ifp->info; |
7f57883e | 459 | |
b748db67 DS |
460 | if (!ei) |
461 | return; | |
7f57883e | 462 | |
b748db67 DS |
463 | eigrp_if_down(ei); |
464 | eigrp_if_up(ei); | |
7f57883e DS |
465 | } |
466 | ||
d62a17ae | 467 | struct eigrp_interface *eigrp_if_lookup_by_local_addr(struct eigrp *eigrp, |
468 | struct interface *ifp, | |
469 | struct in_addr address) | |
7f57883e | 470 | { |
d62a17ae | 471 | struct listnode *node; |
472 | struct eigrp_interface *ei; | |
7f57883e | 473 | |
d62a17ae | 474 | for (ALL_LIST_ELEMENTS_RO(eigrp->eiflist, node, ei)) { |
475 | if (ifp && ei->ifp != ifp) | |
476 | continue; | |
7f57883e | 477 | |
b245781a | 478 | if (IPV4_ADDR_SAME(&address, &ei->address.u.prefix4)) |
d62a17ae | 479 | return ei; |
480 | } | |
7f57883e | 481 | |
d62a17ae | 482 | return NULL; |
7f57883e DS |
483 | } |
484 | ||
485 | /** | |
486 | * @fn eigrp_if_lookup_by_name | |
487 | * | |
488 | * @param[in] eigrp EIGRP process | |
489 | * @param[in] if_name Name of the interface | |
490 | * | |
491 | * @return struct eigrp_interface * | |
492 | * | |
493 | * @par | |
494 | * Function is used for lookup interface by name. | |
495 | */ | |
d62a17ae | 496 | struct eigrp_interface *eigrp_if_lookup_by_name(struct eigrp *eigrp, |
497 | const char *if_name) | |
7f57883e | 498 | { |
d62a17ae | 499 | struct eigrp_interface *ei; |
500 | struct listnode *node; | |
501 | ||
502 | /* iterate over all eigrp interfaces */ | |
503 | for (ALL_LIST_ELEMENTS_RO(eigrp->eiflist, node, ei)) { | |
504 | /* compare int name with eigrp interface's name */ | |
505 | if (strcmp(ei->ifp->name, if_name) == 0) { | |
506 | return ei; | |
507 | } | |
508 | } | |
509 | ||
510 | return NULL; | |
7f57883e | 511 | } |