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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" | |
348addb4 | 55 | #include "eigrpd/eigrp_fsm.h" |
ddbf3e60 | 56 | #include "eigrpd/eigrp_dump.h" |
e9f1847e DS |
57 | #include "eigrpd/eigrp_types.h" |
58 | #include "eigrpd/eigrp_metric.h" | |
7f57883e | 59 | |
b4216e2c DL |
60 | DEFINE_MTYPE_STATIC(EIGRPD, EIGRP_IF, "EIGRP interface"); |
61 | DEFINE_MTYPE_STATIC(EIGRPD, EIGRP_IF_INFO, "EIGRP Interface Information"); | |
62 | ||
d62a17ae | 63 | struct eigrp_interface *eigrp_if_new(struct eigrp *eigrp, struct interface *ifp, |
64 | struct prefix *p) | |
7f57883e | 65 | { |
b748db67 | 66 | struct eigrp_interface *ei = ifp->info; |
d62a17ae | 67 | int i; |
7f57883e | 68 | |
b748db67 | 69 | if (ei) |
d62a17ae | 70 | return ei; |
7f57883e | 71 | |
b748db67 DS |
72 | ei = XCALLOC(MTYPE_EIGRP_IF, sizeof(struct eigrp_interface)); |
73 | ||
d62a17ae | 74 | /* Set zebra interface pointer. */ |
75 | ei->ifp = ifp; | |
b245781a | 76 | prefix_copy(&ei->address, p); |
7f57883e | 77 | |
b748db67 | 78 | ifp->info = ei; |
d62a17ae | 79 | listnode_add(eigrp->eiflist, ei); |
7f57883e | 80 | |
d62a17ae | 81 | ei->type = EIGRP_IFTYPE_BROADCAST; |
7f57883e | 82 | |
d62a17ae | 83 | /* Initialize neighbor list. */ |
84 | ei->nbrs = list_new(); | |
7f57883e | 85 | |
d62a17ae | 86 | ei->crypt_seqnum = time(NULL); |
7f57883e | 87 | |
d62a17ae | 88 | /* Initialize lists */ |
89 | for (i = 0; i < EIGRP_FILTER_MAX; i++) { | |
90 | ei->list[i] = NULL; | |
91 | ei->prefix[i] = NULL; | |
92 | ei->routemap[i] = NULL; | |
93 | } | |
7f57883e | 94 | |
b748db67 | 95 | ei->eigrp = eigrp; |
7f57883e | 96 | |
b748db67 DS |
97 | ei->params.v_hello = EIGRP_HELLO_INTERVAL_DEFAULT; |
98 | ei->params.v_wait = EIGRP_HOLD_INTERVAL_DEFAULT; | |
99 | ei->params.bandwidth = EIGRP_BANDWIDTH_DEFAULT; | |
100 | ei->params.delay = EIGRP_DELAY_DEFAULT; | |
101 | ei->params.reliability = EIGRP_RELIABILITY_DEFAULT; | |
102 | ei->params.load = EIGRP_LOAD_DEFAULT; | |
103 | ei->params.auth_type = EIGRP_AUTH_TYPE_NONE; | |
104 | ei->params.auth_keychain = NULL; | |
7f57883e | 105 | |
85d25587 DS |
106 | ei->curr_bandwidth = ifp->bandwidth; |
107 | ei->curr_mtu = ifp->mtu; | |
108 | ||
b748db67 | 109 | return ei; |
7f57883e DS |
110 | } |
111 | ||
d62a17ae | 112 | int eigrp_if_delete_hook(struct interface *ifp) |
7f57883e | 113 | { |
b748db67 DS |
114 | struct eigrp_interface *ei = ifp->info; |
115 | struct eigrp *eigrp; | |
7f57883e | 116 | |
b748db67 DS |
117 | if (!ei) |
118 | return 0; | |
119 | ||
6a154c88 | 120 | list_delete(&ei->nbrs); |
7f57883e | 121 | |
b748db67 DS |
122 | eigrp = ei->eigrp; |
123 | listnode_delete(eigrp->eiflist, ei); | |
7f57883e | 124 | |
c45db77d DS |
125 | eigrp_fifo_free(ei->obuf); |
126 | ||
d62a17ae | 127 | XFREE(MTYPE_EIGRP_IF_INFO, ifp->info); |
7f57883e | 128 | |
d62a17ae | 129 | return 0; |
7f57883e DS |
130 | } |
131 | ||
138c5a74 DS |
132 | static int eigrp_ifp_create(struct interface *ifp) |
133 | { | |
ef7bd2a3 DS |
134 | struct eigrp_interface *ei = ifp->info; |
135 | ||
136 | if (!ei) | |
137 | return 0; | |
138 | ||
139 | ei->params.type = eigrp_default_iftype(ifp); | |
140 | ||
141 | eigrp_if_update(ifp); | |
142 | ||
138c5a74 DS |
143 | return 0; |
144 | } | |
145 | ||
146 | static int eigrp_ifp_up(struct interface *ifp) | |
147 | { | |
85d25587 | 148 | struct eigrp_interface *ei = ifp->info; |
ddbf3e60 DS |
149 | |
150 | if (IS_DEBUG_EIGRP(zebra, ZEBRA_INTERFACE)) | |
151 | zlog_debug("Zebra: Interface[%s] state change to up.", | |
152 | ifp->name); | |
153 | ||
85d25587 DS |
154 | if (!ei) |
155 | return 0; | |
156 | ||
157 | if (ei->curr_bandwidth != ifp->bandwidth) { | |
158 | if (IS_DEBUG_EIGRP(zebra, ZEBRA_INTERFACE)) | |
159 | zlog_debug( | |
160 | "Zebra: Interface[%s] bandwidth change %d -> %d.", | |
161 | ifp->name, ei->curr_bandwidth, | |
162 | ifp->bandwidth); | |
163 | ||
164 | ei->curr_bandwidth = ifp->bandwidth; | |
165 | // eigrp_if_recalculate_output_cost (ifp); | |
166 | } | |
167 | ||
168 | if (ei->curr_mtu != ifp->mtu) { | |
169 | if (IS_DEBUG_EIGRP(zebra, ZEBRA_INTERFACE)) | |
170 | zlog_debug( | |
171 | "Zebra: Interface[%s] MTU change %u -> %u.", | |
172 | ifp->name, ei->curr_mtu, ifp->mtu); | |
173 | ||
174 | ei->curr_mtu = ifp->mtu; | |
175 | /* Must reset the interface (simulate down/up) when MTU | |
176 | * changes. */ | |
177 | eigrp_if_reset(ifp); | |
178 | return 0; | |
179 | } | |
180 | ||
181 | eigrp_if_up(ifp->info); | |
ddbf3e60 | 182 | |
138c5a74 DS |
183 | return 0; |
184 | } | |
185 | ||
186 | static int eigrp_ifp_down(struct interface *ifp) | |
187 | { | |
b0b69e59 DS |
188 | if (IS_DEBUG_EIGRP(zebra, ZEBRA_INTERFACE)) |
189 | zlog_debug("Zebra: Interface[%s] state change to down.", | |
190 | ifp->name); | |
191 | ||
192 | if (ifp->info) | |
193 | eigrp_if_down(ifp->info); | |
194 | ||
138c5a74 DS |
195 | return 0; |
196 | } | |
197 | ||
198 | static int eigrp_ifp_destroy(struct interface *ifp) | |
199 | { | |
3c3c3252 DS |
200 | if (if_is_up(ifp)) |
201 | zlog_warn("Zebra: got delete of %s, but interface is still up", | |
202 | ifp->name); | |
203 | ||
204 | if (IS_DEBUG_EIGRP(zebra, ZEBRA_INTERFACE)) | |
205 | zlog_debug( | |
206 | "Zebra: interface delete %s index %d flags %llx metric %d mtu %d", | |
207 | ifp->name, ifp->ifindex, (unsigned long long)ifp->flags, | |
208 | ifp->metric, ifp->mtu); | |
209 | ||
210 | if (ifp->info) | |
211 | eigrp_if_free(ifp->info, INTERFACE_DOWN_BY_ZEBRA); | |
212 | ||
138c5a74 DS |
213 | return 0; |
214 | } | |
215 | ||
7f57883e DS |
216 | struct list *eigrp_iflist; |
217 | ||
4d762f26 | 218 | void eigrp_if_init(void) |
7f57883e | 219 | { |
138c5a74 DS |
220 | if_zapi_callbacks(eigrp_ifp_create, eigrp_ifp_up, |
221 | eigrp_ifp_down, eigrp_ifp_destroy); | |
d62a17ae | 222 | /* Initialize Zebra interface data structure. */ |
996c9314 | 223 | // hook_register_prio(if_add, 0, eigrp_if_new); |
ce19a04a | 224 | hook_register_prio(if_del, 0, eigrp_if_delete_hook); |
7f57883e DS |
225 | } |
226 | ||
7f57883e | 227 | |
d62a17ae | 228 | void eigrp_del_if_params(struct eigrp_if_params *eip) |
7f57883e | 229 | { |
d62a17ae | 230 | if (eip->auth_keychain) |
231 | free(eip->auth_keychain); | |
7f57883e DS |
232 | } |
233 | ||
7c6ff2c5 DS |
234 | /* |
235 | * Set the network byte order of the 3 bytes we send | |
236 | * of the mtu of the link. | |
237 | */ | |
238 | static void eigrp_mtu_convert(struct eigrp_metrics *metric, uint32_t host_mtu) | |
239 | { | |
240 | uint32_t network_mtu = htonl(host_mtu); | |
241 | uint8_t *nm = (uint8_t *)&network_mtu; | |
242 | ||
243 | metric->mtu[0] = nm[1]; | |
244 | metric->mtu[1] = nm[2]; | |
245 | metric->mtu[2] = nm[3]; | |
246 | } | |
247 | ||
d62a17ae | 248 | int eigrp_if_up(struct eigrp_interface *ei) |
7f57883e | 249 | { |
dc4accdd DS |
250 | struct eigrp_prefix_descriptor *pe; |
251 | struct eigrp_route_descriptor *ne; | |
d62a17ae | 252 | struct eigrp_metrics metric; |
253 | struct eigrp_interface *ei2; | |
254 | struct listnode *node, *nnode; | |
dbfd865b | 255 | struct eigrp *eigrp; |
d62a17ae | 256 | |
257 | if (ei == NULL) | |
258 | return 0; | |
259 | ||
dbfd865b DS |
260 | eigrp = ei->eigrp; |
261 | eigrp_adjust_sndbuflen(eigrp, ei->ifp->mtu); | |
262 | ||
d62a17ae | 263 | eigrp_if_stream_set(ei); |
264 | ||
265 | /* Set multicast memberships appropriately for new state. */ | |
266 | eigrp_if_set_multicast(ei); | |
267 | ||
268 | thread_add_event(master, eigrp_hello_timer, ei, (1), NULL); | |
269 | ||
270 | /*Prepare metrics*/ | |
996c9314 | 271 | metric.bandwidth = eigrp_bandwidth_to_scaled(ei->params.bandwidth); |
b748db67 DS |
272 | metric.delay = eigrp_delay_to_scaled(ei->params.delay); |
273 | metric.load = ei->params.load; | |
274 | metric.reliability = ei->params.reliability; | |
7c6ff2c5 | 275 | eigrp_mtu_convert(&metric, ei->ifp->mtu); |
d62a17ae | 276 | metric.hop_count = 0; |
277 | metric.flags = 0; | |
278 | metric.tag = 0; | |
279 | ||
280 | /*Add connected entry to topology table*/ | |
281 | ||
dc4accdd | 282 | ne = eigrp_route_descriptor_new(); |
348addb4 DS |
283 | ne->ei = ei; |
284 | ne->reported_metric = metric; | |
285 | ne->total_metric = metric; | |
286 | ne->distance = eigrp_calculate_metrics(eigrp, metric); | |
287 | ne->reported_distance = 0; | |
288 | ne->adv_router = eigrp->neighbor_self; | |
dc4accdd | 289 | ne->flags = EIGRP_ROUTE_DESCRIPTOR_SUCCESSOR_FLAG; |
348addb4 | 290 | |
02b45998 | 291 | struct prefix dest_addr; |
d62a17ae | 292 | |
b245781a | 293 | dest_addr = ei->address; |
02b45998 | 294 | apply_mask(&dest_addr); |
d62a17ae | 295 | pe = eigrp_topology_table_lookup_ipv4(eigrp->topology_table, |
476a1469 | 296 | &dest_addr); |
d62a17ae | 297 | |
298 | if (pe == NULL) { | |
dc4accdd | 299 | pe = eigrp_prefix_descriptor_new(); |
d62a17ae | 300 | pe->serno = eigrp->serno; |
02b45998 DS |
301 | pe->destination = (struct prefix *)prefix_ipv4_new(); |
302 | prefix_copy(pe->destination, &dest_addr); | |
d62a17ae | 303 | pe->af = AF_INET; |
304 | pe->nt = EIGRP_TOPOLOGY_TYPE_CONNECTED; | |
305 | ||
348addb4 | 306 | ne->prefix = pe; |
cd6c573c | 307 | pe->reported_metric = metric; |
d62a17ae | 308 | pe->state = EIGRP_FSM_STATE_PASSIVE; |
309 | pe->fdistance = eigrp_calculate_metrics(eigrp, metric); | |
310 | pe->req_action |= EIGRP_FSM_NEED_UPDATE; | |
dc4accdd | 311 | eigrp_prefix_descriptor_add(eigrp->topology_table, pe); |
d62a17ae | 312 | listnode_add(eigrp->topology_changes_internalIPV4, pe); |
d62a17ae | 313 | |
dc4accdd | 314 | eigrp_route_descriptor_add(eigrp, pe, ne); |
d62a17ae | 315 | |
348addb4 DS |
316 | for (ALL_LIST_ELEMENTS(eigrp->eiflist, node, nnode, ei2)) { |
317 | eigrp_update_send(ei2); | |
318 | } | |
319 | ||
320 | pe->req_action &= ~EIGRP_FSM_NEED_UPDATE; | |
321 | listnode_delete(eigrp->topology_changes_internalIPV4, pe); | |
322 | } else { | |
323 | struct eigrp_fsm_action_message msg; | |
324 | ||
325 | ne->prefix = pe; | |
dc4accdd | 326 | eigrp_route_descriptor_add(eigrp, pe, ne); |
348addb4 DS |
327 | |
328 | msg.packet_type = EIGRP_OPC_UPDATE; | |
329 | msg.eigrp = eigrp; | |
330 | msg.data_type = EIGRP_CONNECTED; | |
331 | msg.adv_router = NULL; | |
332 | msg.entry = ne; | |
333 | msg.prefix = pe; | |
334 | ||
335 | eigrp_fsm_event(&msg); | |
336 | } | |
d62a17ae | 337 | |
338 | return 1; | |
7f57883e DS |
339 | } |
340 | ||
d62a17ae | 341 | int eigrp_if_down(struct eigrp_interface *ei) |
7f57883e | 342 | { |
d62a17ae | 343 | struct listnode *node, *nnode; |
344 | struct eigrp_neighbor *nbr; | |
7f57883e | 345 | |
d62a17ae | 346 | if (ei == NULL) |
347 | return 0; | |
7f57883e | 348 | |
d62a17ae | 349 | /* Shutdown packet reception and sending */ |
28ef0ee1 | 350 | THREAD_OFF(ei->t_hello); |
7f57883e | 351 | |
d62a17ae | 352 | eigrp_if_stream_unset(ei); |
7f57883e | 353 | |
d62a17ae | 354 | /*Set infinite metrics to routes learned by this interface and start |
355 | * query process*/ | |
356 | for (ALL_LIST_ELEMENTS(ei->nbrs, node, nnode, nbr)) { | |
357 | eigrp_nbr_delete(nbr); | |
358 | } | |
7f57883e | 359 | |
d62a17ae | 360 | return 1; |
7f57883e DS |
361 | } |
362 | ||
d62a17ae | 363 | void eigrp_if_stream_set(struct eigrp_interface *ei) |
7f57883e | 364 | { |
d62a17ae | 365 | /* set output fifo queue. */ |
366 | if (ei->obuf == NULL) | |
367 | ei->obuf = eigrp_fifo_new(); | |
7f57883e DS |
368 | } |
369 | ||
d62a17ae | 370 | void eigrp_if_stream_unset(struct eigrp_interface *ei) |
7f57883e | 371 | { |
d62a17ae | 372 | struct eigrp *eigrp = ei->eigrp; |
373 | ||
c45db77d DS |
374 | if (ei->on_write_q) { |
375 | listnode_delete(eigrp->oi_write_q, ei); | |
376 | if (list_isempty(eigrp->oi_write_q)) | |
b3d6bc6e | 377 | thread_cancel(&(eigrp->t_write)); |
c45db77d | 378 | ei->on_write_q = 0; |
d62a17ae | 379 | } |
7f57883e DS |
380 | } |
381 | ||
b748db67 DS |
382 | bool eigrp_if_is_passive(struct eigrp_interface *ei) |
383 | { | |
384 | if (ei->params.passive_interface == EIGRP_IF_ACTIVE) | |
385 | return false; | |
386 | ||
387 | if (ei->eigrp->passive_interface_default == EIGRP_IF_ACTIVE) | |
388 | return false; | |
389 | ||
390 | return true; | |
391 | } | |
392 | ||
d62a17ae | 393 | void eigrp_if_set_multicast(struct eigrp_interface *ei) |
7f57883e | 394 | { |
b748db67 | 395 | if (!eigrp_if_is_passive(ei)) { |
d62a17ae | 396 | /* The interface should belong to the EIGRP-all-routers group. |
397 | */ | |
b748db67 | 398 | if (!ei->member_allrouters |
b245781a | 399 | && (eigrp_if_add_allspfrouters(ei->eigrp, &ei->address, |
d62a17ae | 400 | ei->ifp->ifindex) |
401 | >= 0)) | |
402 | /* Set the flag only if the system call to join | |
403 | * succeeded. */ | |
b748db67 | 404 | ei->member_allrouters = true; |
d62a17ae | 405 | } else { |
406 | /* The interface should NOT belong to the EIGRP-all-routers | |
407 | * group. */ | |
b748db67 | 408 | if (ei->member_allrouters) { |
d62a17ae | 409 | /* Only actually drop if this is the last reference */ |
b245781a | 410 | eigrp_if_drop_allspfrouters(ei->eigrp, &ei->address, |
b748db67 | 411 | ei->ifp->ifindex); |
d62a17ae | 412 | /* Unset the flag regardless of whether the system call |
413 | to leave | |
414 | the group succeeded, since it's much safer to assume | |
415 | that | |
416 | we are not a member. */ | |
b748db67 | 417 | ei->member_allrouters = false; |
d62a17ae | 418 | } |
419 | } | |
7f57883e DS |
420 | } |
421 | ||
d7c0a89a | 422 | uint8_t eigrp_default_iftype(struct interface *ifp) |
7f57883e | 423 | { |
d62a17ae | 424 | if (if_is_pointopoint(ifp)) |
425 | return EIGRP_IFTYPE_POINTOPOINT; | |
426 | else if (if_is_loopback(ifp)) | |
427 | return EIGRP_IFTYPE_LOOPBACK; | |
428 | else | |
429 | return EIGRP_IFTYPE_BROADCAST; | |
7f57883e DS |
430 | } |
431 | ||
996c9314 | 432 | void eigrp_if_free(struct eigrp_interface *ei, int source) |
7f57883e | 433 | { |
476a1469 | 434 | struct prefix dest_addr; |
dc4accdd | 435 | struct eigrp_prefix_descriptor *pe; |
e9449961 | 436 | struct eigrp *eigrp = ei->eigrp; |
0bf75bd5 | 437 | |
d62a17ae | 438 | if (source == INTERFACE_DOWN_BY_VTY) { |
50478845 | 439 | thread_cancel(&ei->t_hello); |
d62a17ae | 440 | eigrp_hello_send(ei, EIGRP_HELLO_GRACEFUL_SHUTDOWN, NULL); |
441 | } | |
442 | ||
b245781a | 443 | dest_addr = ei->address; |
476a1469 | 444 | apply_mask(&dest_addr); |
d62a17ae | 445 | pe = eigrp_topology_table_lookup_ipv4(eigrp->topology_table, |
446 | &dest_addr); | |
447 | if (pe) | |
dc4accdd DS |
448 | eigrp_prefix_descriptor_delete(eigrp, eigrp->topology_table, |
449 | pe); | |
d62a17ae | 450 | |
451 | eigrp_if_down(ei); | |
452 | ||
d62a17ae | 453 | listnode_delete(ei->eigrp->eiflist, ei); |
7f57883e DS |
454 | } |
455 | ||
456 | /* Simulate down/up on the interface. This is needed, for example, when | |
f9e5c9ca | 457 | the MTU changes. */ |
d62a17ae | 458 | void eigrp_if_reset(struct interface *ifp) |
7f57883e | 459 | { |
b748db67 | 460 | struct eigrp_interface *ei = ifp->info; |
7f57883e | 461 | |
b748db67 DS |
462 | if (!ei) |
463 | return; | |
7f57883e | 464 | |
b748db67 DS |
465 | eigrp_if_down(ei); |
466 | eigrp_if_up(ei); | |
7f57883e DS |
467 | } |
468 | ||
d62a17ae | 469 | struct eigrp_interface *eigrp_if_lookup_by_local_addr(struct eigrp *eigrp, |
470 | struct interface *ifp, | |
471 | struct in_addr address) | |
7f57883e | 472 | { |
d62a17ae | 473 | struct listnode *node; |
474 | struct eigrp_interface *ei; | |
7f57883e | 475 | |
d62a17ae | 476 | for (ALL_LIST_ELEMENTS_RO(eigrp->eiflist, node, ei)) { |
477 | if (ifp && ei->ifp != ifp) | |
478 | continue; | |
7f57883e | 479 | |
b245781a | 480 | if (IPV4_ADDR_SAME(&address, &ei->address.u.prefix4)) |
d62a17ae | 481 | return ei; |
482 | } | |
7f57883e | 483 | |
d62a17ae | 484 | return NULL; |
7f57883e DS |
485 | } |
486 | ||
487 | /** | |
488 | * @fn eigrp_if_lookup_by_name | |
489 | * | |
490 | * @param[in] eigrp EIGRP process | |
491 | * @param[in] if_name Name of the interface | |
492 | * | |
493 | * @return struct eigrp_interface * | |
494 | * | |
495 | * @par | |
496 | * Function is used for lookup interface by name. | |
497 | */ | |
d62a17ae | 498 | struct eigrp_interface *eigrp_if_lookup_by_name(struct eigrp *eigrp, |
499 | const char *if_name) | |
7f57883e | 500 | { |
d62a17ae | 501 | struct eigrp_interface *ei; |
502 | struct listnode *node; | |
503 | ||
504 | /* iterate over all eigrp interfaces */ | |
505 | for (ALL_LIST_ELEMENTS_RO(eigrp->eiflist, node, ei)) { | |
506 | /* compare int name with eigrp interface's name */ | |
507 | if (strcmp(ei->ifp->name, if_name) == 0) { | |
508 | return ei; | |
509 | } | |
510 | } | |
511 | ||
512 | return NULL; | |
7f57883e | 513 | } |