]>
Commit | Line | Data |
---|---|---|
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" |
7f57883e | 57 | |
d62a17ae | 58 | struct eigrp_interface *eigrp_if_new(struct eigrp *eigrp, struct interface *ifp, |
59 | struct prefix *p) | |
7f57883e | 60 | { |
b748db67 | 61 | struct eigrp_interface *ei = ifp->info; |
d62a17ae | 62 | int i; |
7f57883e | 63 | |
b748db67 | 64 | if (ei) |
d62a17ae | 65 | return ei; |
7f57883e | 66 | |
b748db67 DS |
67 | ei = XCALLOC(MTYPE_EIGRP_IF, sizeof(struct eigrp_interface)); |
68 | ||
d62a17ae | 69 | /* Set zebra interface pointer. */ |
70 | ei->ifp = ifp; | |
71 | ei->address = p; | |
7f57883e | 72 | |
b748db67 | 73 | ifp->info = ei; |
d62a17ae | 74 | listnode_add(eigrp->eiflist, ei); |
7f57883e | 75 | |
d62a17ae | 76 | ei->type = EIGRP_IFTYPE_BROADCAST; |
7f57883e | 77 | |
d62a17ae | 78 | /* Initialize neighbor list. */ |
79 | ei->nbrs = list_new(); | |
7f57883e | 80 | |
d62a17ae | 81 | ei->crypt_seqnum = time(NULL); |
7f57883e | 82 | |
d62a17ae | 83 | /* Initialize lists */ |
84 | for (i = 0; i < EIGRP_FILTER_MAX; i++) { | |
85 | ei->list[i] = NULL; | |
86 | ei->prefix[i] = NULL; | |
87 | ei->routemap[i] = NULL; | |
88 | } | |
7f57883e | 89 | |
b748db67 | 90 | ei->eigrp = eigrp; |
7f57883e | 91 | |
b748db67 DS |
92 | ei->params.v_hello = EIGRP_HELLO_INTERVAL_DEFAULT; |
93 | ei->params.v_wait = EIGRP_HOLD_INTERVAL_DEFAULT; | |
94 | ei->params.bandwidth = EIGRP_BANDWIDTH_DEFAULT; | |
95 | ei->params.delay = EIGRP_DELAY_DEFAULT; | |
96 | ei->params.reliability = EIGRP_RELIABILITY_DEFAULT; | |
97 | ei->params.load = EIGRP_LOAD_DEFAULT; | |
98 | ei->params.auth_type = EIGRP_AUTH_TYPE_NONE; | |
99 | ei->params.auth_keychain = NULL; | |
7f57883e | 100 | |
b748db67 | 101 | return ei; |
7f57883e DS |
102 | } |
103 | ||
d62a17ae | 104 | int eigrp_if_delete_hook(struct interface *ifp) |
7f57883e | 105 | { |
b748db67 DS |
106 | struct eigrp_interface *ei = ifp->info; |
107 | struct eigrp *eigrp; | |
7f57883e | 108 | |
b748db67 DS |
109 | if (!ei) |
110 | return 0; | |
111 | ||
affe9e99 | 112 | list_delete_and_null(&ei->nbrs); |
7f57883e | 113 | |
b748db67 DS |
114 | eigrp = ei->eigrp; |
115 | listnode_delete(eigrp->eiflist, ei); | |
7f57883e | 116 | |
d62a17ae | 117 | XFREE(MTYPE_EIGRP_IF_INFO, ifp->info); |
118 | ifp->info = NULL; | |
7f57883e | 119 | |
d62a17ae | 120 | return 0; |
7f57883e DS |
121 | } |
122 | ||
123 | struct list *eigrp_iflist; | |
124 | ||
d62a17ae | 125 | void eigrp_if_init() |
7f57883e | 126 | { |
d62a17ae | 127 | /* Initialize Zebra interface data structure. */ |
996c9314 | 128 | // hook_register_prio(if_add, 0, eigrp_if_new); |
ce19a04a | 129 | hook_register_prio(if_del, 0, eigrp_if_delete_hook); |
7f57883e DS |
130 | } |
131 | ||
7f57883e | 132 | |
d62a17ae | 133 | void eigrp_del_if_params(struct eigrp_if_params *eip) |
7f57883e | 134 | { |
d62a17ae | 135 | if (eip->auth_keychain) |
136 | free(eip->auth_keychain); | |
7f57883e DS |
137 | } |
138 | ||
d62a17ae | 139 | int eigrp_if_up(struct eigrp_interface *ei) |
7f57883e | 140 | { |
d62a17ae | 141 | struct eigrp_prefix_entry *pe; |
255ab940 | 142 | struct eigrp_nexthop_entry *ne; |
d62a17ae | 143 | struct eigrp_metrics metric; |
144 | struct eigrp_interface *ei2; | |
145 | struct listnode *node, *nnode; | |
dbfd865b | 146 | struct eigrp *eigrp; |
d62a17ae | 147 | |
148 | if (ei == NULL) | |
149 | return 0; | |
150 | ||
dbfd865b DS |
151 | eigrp = ei->eigrp; |
152 | eigrp_adjust_sndbuflen(eigrp, ei->ifp->mtu); | |
153 | ||
d62a17ae | 154 | eigrp_if_stream_set(ei); |
155 | ||
156 | /* Set multicast memberships appropriately for new state. */ | |
157 | eigrp_if_set_multicast(ei); | |
158 | ||
159 | thread_add_event(master, eigrp_hello_timer, ei, (1), NULL); | |
160 | ||
161 | /*Prepare metrics*/ | |
996c9314 | 162 | metric.bandwidth = eigrp_bandwidth_to_scaled(ei->params.bandwidth); |
b748db67 DS |
163 | metric.delay = eigrp_delay_to_scaled(ei->params.delay); |
164 | metric.load = ei->params.load; | |
165 | metric.reliability = ei->params.reliability; | |
d62a17ae | 166 | metric.mtu[0] = 0xDC; |
167 | metric.mtu[1] = 0x05; | |
168 | metric.mtu[2] = 0x00; | |
169 | metric.hop_count = 0; | |
170 | metric.flags = 0; | |
171 | metric.tag = 0; | |
172 | ||
173 | /*Add connected entry to topology table*/ | |
174 | ||
255ab940 | 175 | ne = eigrp_nexthop_entry_new(); |
348addb4 DS |
176 | ne->ei = ei; |
177 | ne->reported_metric = metric; | |
178 | ne->total_metric = metric; | |
179 | ne->distance = eigrp_calculate_metrics(eigrp, metric); | |
180 | ne->reported_distance = 0; | |
181 | ne->adv_router = eigrp->neighbor_self; | |
255ab940 | 182 | ne->flags = EIGRP_NEXTHOP_ENTRY_SUCCESSOR_FLAG; |
348addb4 | 183 | |
02b45998 | 184 | struct prefix dest_addr; |
d62a17ae | 185 | |
186 | dest_addr.family = AF_INET; | |
02b45998 | 187 | dest_addr.u.prefix4 = ei->connected->address->u.prefix4; |
d62a17ae | 188 | dest_addr.prefixlen = ei->connected->address->prefixlen; |
02b45998 | 189 | apply_mask(&dest_addr); |
d62a17ae | 190 | pe = eigrp_topology_table_lookup_ipv4(eigrp->topology_table, |
476a1469 | 191 | &dest_addr); |
d62a17ae | 192 | |
193 | if (pe == NULL) { | |
194 | pe = eigrp_prefix_entry_new(); | |
195 | pe->serno = eigrp->serno; | |
02b45998 DS |
196 | pe->destination = (struct prefix *)prefix_ipv4_new(); |
197 | prefix_copy(pe->destination, &dest_addr); | |
d62a17ae | 198 | pe->af = AF_INET; |
199 | pe->nt = EIGRP_TOPOLOGY_TYPE_CONNECTED; | |
200 | ||
348addb4 | 201 | ne->prefix = pe; |
cd6c573c | 202 | pe->reported_metric = metric; |
d62a17ae | 203 | pe->state = EIGRP_FSM_STATE_PASSIVE; |
204 | pe->fdistance = eigrp_calculate_metrics(eigrp, metric); | |
205 | pe->req_action |= EIGRP_FSM_NEED_UPDATE; | |
206 | eigrp_prefix_entry_add(eigrp->topology_table, pe); | |
207 | listnode_add(eigrp->topology_changes_internalIPV4, pe); | |
d62a17ae | 208 | |
255ab940 | 209 | eigrp_nexthop_entry_add(pe, ne); |
d62a17ae | 210 | |
348addb4 DS |
211 | for (ALL_LIST_ELEMENTS(eigrp->eiflist, node, nnode, ei2)) { |
212 | eigrp_update_send(ei2); | |
213 | } | |
214 | ||
215 | pe->req_action &= ~EIGRP_FSM_NEED_UPDATE; | |
216 | listnode_delete(eigrp->topology_changes_internalIPV4, pe); | |
217 | } else { | |
218 | struct eigrp_fsm_action_message msg; | |
219 | ||
220 | ne->prefix = pe; | |
255ab940 | 221 | eigrp_nexthop_entry_add(pe, ne); |
348addb4 DS |
222 | |
223 | msg.packet_type = EIGRP_OPC_UPDATE; | |
224 | msg.eigrp = eigrp; | |
225 | msg.data_type = EIGRP_CONNECTED; | |
226 | msg.adv_router = NULL; | |
227 | msg.entry = ne; | |
228 | msg.prefix = pe; | |
229 | ||
230 | eigrp_fsm_event(&msg); | |
231 | } | |
d62a17ae | 232 | |
233 | return 1; | |
7f57883e DS |
234 | } |
235 | ||
d62a17ae | 236 | int eigrp_if_down(struct eigrp_interface *ei) |
7f57883e | 237 | { |
d62a17ae | 238 | struct listnode *node, *nnode; |
239 | struct eigrp_neighbor *nbr; | |
7f57883e | 240 | |
d62a17ae | 241 | if (ei == NULL) |
242 | return 0; | |
7f57883e | 243 | |
d62a17ae | 244 | /* Shutdown packet reception and sending */ |
245 | if (ei->t_hello) | |
246 | THREAD_OFF(ei->t_hello); | |
7f57883e | 247 | |
d62a17ae | 248 | eigrp_if_stream_unset(ei); |
7f57883e | 249 | |
d62a17ae | 250 | /*Set infinite metrics to routes learned by this interface and start |
251 | * query process*/ | |
252 | for (ALL_LIST_ELEMENTS(ei->nbrs, node, nnode, nbr)) { | |
253 | eigrp_nbr_delete(nbr); | |
254 | } | |
7f57883e | 255 | |
d62a17ae | 256 | return 1; |
7f57883e DS |
257 | } |
258 | ||
d62a17ae | 259 | void eigrp_if_stream_set(struct eigrp_interface *ei) |
7f57883e | 260 | { |
d62a17ae | 261 | /* set output fifo queue. */ |
262 | if (ei->obuf == NULL) | |
263 | ei->obuf = eigrp_fifo_new(); | |
7f57883e DS |
264 | } |
265 | ||
d62a17ae | 266 | void eigrp_if_stream_unset(struct eigrp_interface *ei) |
7f57883e | 267 | { |
d62a17ae | 268 | struct eigrp *eigrp = ei->eigrp; |
269 | ||
270 | if (ei->obuf) { | |
271 | eigrp_fifo_free(ei->obuf); | |
272 | ei->obuf = NULL; | |
273 | ||
274 | if (ei->on_write_q) { | |
275 | listnode_delete(eigrp->oi_write_q, ei); | |
276 | if (list_isempty(eigrp->oi_write_q)) | |
277 | thread_cancel(eigrp->t_write); | |
278 | ei->on_write_q = 0; | |
279 | } | |
280 | } | |
7f57883e DS |
281 | } |
282 | ||
b748db67 DS |
283 | bool eigrp_if_is_passive(struct eigrp_interface *ei) |
284 | { | |
285 | if (ei->params.passive_interface == EIGRP_IF_ACTIVE) | |
286 | return false; | |
287 | ||
288 | if (ei->eigrp->passive_interface_default == EIGRP_IF_ACTIVE) | |
289 | return false; | |
290 | ||
291 | return true; | |
292 | } | |
293 | ||
d62a17ae | 294 | void eigrp_if_set_multicast(struct eigrp_interface *ei) |
7f57883e | 295 | { |
b748db67 | 296 | if (!eigrp_if_is_passive(ei)) { |
d62a17ae | 297 | /* The interface should belong to the EIGRP-all-routers group. |
298 | */ | |
b748db67 | 299 | if (!ei->member_allrouters |
d62a17ae | 300 | && (eigrp_if_add_allspfrouters(ei->eigrp, ei->address, |
301 | ei->ifp->ifindex) | |
302 | >= 0)) | |
303 | /* Set the flag only if the system call to join | |
304 | * succeeded. */ | |
b748db67 | 305 | ei->member_allrouters = true; |
d62a17ae | 306 | } else { |
307 | /* The interface should NOT belong to the EIGRP-all-routers | |
308 | * group. */ | |
b748db67 | 309 | if (ei->member_allrouters) { |
d62a17ae | 310 | /* Only actually drop if this is the last reference */ |
996c9314 | 311 | eigrp_if_drop_allspfrouters(ei->eigrp, ei->address, |
b748db67 | 312 | ei->ifp->ifindex); |
d62a17ae | 313 | /* Unset the flag regardless of whether the system call |
314 | to leave | |
315 | the group succeeded, since it's much safer to assume | |
316 | that | |
317 | we are not a member. */ | |
b748db67 | 318 | ei->member_allrouters = false; |
d62a17ae | 319 | } |
320 | } | |
7f57883e DS |
321 | } |
322 | ||
d7c0a89a | 323 | uint8_t eigrp_default_iftype(struct interface *ifp) |
7f57883e | 324 | { |
d62a17ae | 325 | if (if_is_pointopoint(ifp)) |
326 | return EIGRP_IFTYPE_POINTOPOINT; | |
327 | else if (if_is_loopback(ifp)) | |
328 | return EIGRP_IFTYPE_LOOPBACK; | |
329 | else | |
330 | return EIGRP_IFTYPE_BROADCAST; | |
7f57883e DS |
331 | } |
332 | ||
996c9314 | 333 | void eigrp_if_free(struct eigrp_interface *ei, int source) |
7f57883e | 334 | { |
476a1469 | 335 | struct prefix dest_addr; |
d62a17ae | 336 | struct eigrp_prefix_entry *pe; |
337 | struct eigrp *eigrp = eigrp_lookup(); | |
338 | ||
0bf75bd5 | 339 | if (!eigrp) |
340 | return; | |
341 | ||
d62a17ae | 342 | if (source == INTERFACE_DOWN_BY_VTY) { |
343 | THREAD_OFF(ei->t_hello); | |
344 | eigrp_hello_send(ei, EIGRP_HELLO_GRACEFUL_SHUTDOWN, NULL); | |
345 | } | |
346 | ||
476a1469 DS |
347 | dest_addr = *ei->connected->address; |
348 | apply_mask(&dest_addr); | |
d62a17ae | 349 | pe = eigrp_topology_table_lookup_ipv4(eigrp->topology_table, |
350 | &dest_addr); | |
351 | if (pe) | |
352 | eigrp_prefix_entry_delete(eigrp->topology_table, pe); | |
353 | ||
354 | eigrp_if_down(ei); | |
355 | ||
affe9e99 | 356 | list_delete_and_null(&ei->nbrs); |
d62a17ae | 357 | listnode_delete(ei->eigrp->eiflist, ei); |
7f57883e DS |
358 | } |
359 | ||
360 | /* Simulate down/up on the interface. This is needed, for example, when | |
f9e5c9ca | 361 | the MTU changes. */ |
d62a17ae | 362 | void eigrp_if_reset(struct interface *ifp) |
7f57883e | 363 | { |
b748db67 | 364 | struct eigrp_interface *ei = ifp->info; |
7f57883e | 365 | |
b748db67 DS |
366 | if (!ei) |
367 | return; | |
7f57883e | 368 | |
b748db67 DS |
369 | eigrp_if_down(ei); |
370 | eigrp_if_up(ei); | |
7f57883e DS |
371 | } |
372 | ||
d62a17ae | 373 | struct eigrp_interface *eigrp_if_lookup_by_local_addr(struct eigrp *eigrp, |
374 | struct interface *ifp, | |
375 | struct in_addr address) | |
7f57883e | 376 | { |
d62a17ae | 377 | struct listnode *node; |
378 | struct eigrp_interface *ei; | |
7f57883e | 379 | |
d62a17ae | 380 | for (ALL_LIST_ELEMENTS_RO(eigrp->eiflist, node, ei)) { |
381 | if (ifp && ei->ifp != ifp) | |
382 | continue; | |
7f57883e | 383 | |
d62a17ae | 384 | if (IPV4_ADDR_SAME(&address, &ei->address->u.prefix4)) |
385 | return ei; | |
386 | } | |
7f57883e | 387 | |
d62a17ae | 388 | return NULL; |
7f57883e DS |
389 | } |
390 | ||
391 | /** | |
392 | * @fn eigrp_if_lookup_by_name | |
393 | * | |
394 | * @param[in] eigrp EIGRP process | |
395 | * @param[in] if_name Name of the interface | |
396 | * | |
397 | * @return struct eigrp_interface * | |
398 | * | |
399 | * @par | |
400 | * Function is used for lookup interface by name. | |
401 | */ | |
d62a17ae | 402 | struct eigrp_interface *eigrp_if_lookup_by_name(struct eigrp *eigrp, |
403 | const char *if_name) | |
7f57883e | 404 | { |
d62a17ae | 405 | struct eigrp_interface *ei; |
406 | struct listnode *node; | |
407 | ||
408 | /* iterate over all eigrp interfaces */ | |
409 | for (ALL_LIST_ELEMENTS_RO(eigrp->eiflist, node, ei)) { | |
410 | /* compare int name with eigrp interface's name */ | |
411 | if (strcmp(ei->ifp->name, if_name) == 0) { | |
412 | return ei; | |
413 | } | |
414 | } | |
415 | ||
416 | return NULL; | |
7f57883e DS |
417 | } |
418 | ||
d7c0a89a | 419 | uint32_t eigrp_bandwidth_to_scaled(uint32_t bandwidth) |
7f57883e | 420 | { |
d62a17ae | 421 | uint64_t temp_bandwidth = (256ull * 10000000) / bandwidth; |
7f57883e | 422 | |
d62a17ae | 423 | temp_bandwidth = temp_bandwidth < EIGRP_MAX_METRIC ? temp_bandwidth |
424 | : EIGRP_MAX_METRIC; | |
7f57883e | 425 | |
d7c0a89a | 426 | return (uint32_t)temp_bandwidth; |
7f57883e DS |
427 | } |
428 | ||
d7c0a89a | 429 | uint32_t eigrp_scaled_to_bandwidth(uint32_t scaled) |
7f57883e | 430 | { |
d62a17ae | 431 | uint64_t temp_scaled = scaled * (256ull * 10000000); |
7f57883e | 432 | |
d62a17ae | 433 | temp_scaled = |
434 | temp_scaled < EIGRP_MAX_METRIC ? temp_scaled : EIGRP_MAX_METRIC; | |
7f57883e | 435 | |
d7c0a89a | 436 | return (uint32_t)temp_scaled; |
7f57883e DS |
437 | } |
438 | ||
d7c0a89a | 439 | uint32_t eigrp_delay_to_scaled(uint32_t delay) |
7f57883e | 440 | { |
d62a17ae | 441 | return delay * 256; |
7f57883e DS |
442 | } |
443 | ||
d7c0a89a | 444 | uint32_t eigrp_scaled_to_delay(uint32_t scaled) |
7f57883e | 445 | { |
d62a17ae | 446 | return scaled / 256; |
7f57883e | 447 | } |