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2fb975da TT |
1 | /* NHRP interface |
2 | * Copyright (c) 2014-2015 Timo Teräs | |
3 | * | |
4 | * This file is free software: you may copy, redistribute and/or modify | |
5 | * it under the terms of the GNU General Public License as published by | |
6 | * the Free Software Foundation, either version 2 of the License, or | |
7 | * (at your option) any later version. | |
8 | */ | |
9 | ||
b45ac5f5 DL |
10 | #ifdef HAVE_CONFIG_H |
11 | #include "config.h" | |
12 | #endif | |
13 | ||
2fb975da TT |
14 | #include <net/if_arp.h> |
15 | #include "zebra.h" | |
16 | #include "linklist.h" | |
17 | #include "memory.h" | |
18 | #include "thread.h" | |
19 | ||
20 | #include "nhrpd.h" | |
21 | #include "os.h" | |
22 | #include "netlink.h" | |
23 | ||
819dc8bb DL |
24 | DEFINE_MTYPE_STATIC(NHRPD, NHRP_IF, "NHRP interface") |
25 | ||
fef2ed13 PG |
26 | static void nhrp_interface_update_cache_config(struct interface *ifp, |
27 | bool available, | |
28 | uint8_t family); | |
29 | ||
2fb975da TT |
30 | static int nhrp_if_new_hook(struct interface *ifp) |
31 | { | |
32 | struct nhrp_interface *nifp; | |
33 | afi_t afi; | |
34 | ||
35 | nifp = XCALLOC(MTYPE_NHRP_IF, sizeof(struct nhrp_interface)); | |
2fb975da TT |
36 | |
37 | ifp->info = nifp; | |
38 | nifp->ifp = ifp; | |
39 | ||
40 | notifier_init(&nifp->notifier_list); | |
41 | for (afi = 0; afi < AFI_MAX; afi++) { | |
42 | struct nhrp_afi_data *ad = &nifp->afi[afi]; | |
43 | ad->holdtime = NHRPD_DEFAULT_HOLDTIME; | |
44 | list_init(&ad->nhslist_head); | |
45 | } | |
46 | ||
47 | return 0; | |
48 | } | |
49 | ||
50 | static int nhrp_if_delete_hook(struct interface *ifp) | |
51 | { | |
ee72f0a0 RD |
52 | struct nhrp_interface *nifp = ifp->info; |
53 | ||
54 | debugf(NHRP_DEBUG_IF, "Deleted interface (%s)", ifp->name); | |
55 | ||
56 | nhrp_cache_interface_del(ifp); | |
57 | nhrp_nhs_interface_del(ifp); | |
58 | nhrp_peer_interface_del(ifp); | |
59 | ||
60 | if (nifp->ipsec_profile) | |
61 | free(nifp->ipsec_profile); | |
62 | if (nifp->ipsec_fallback_profile) | |
63 | free(nifp->ipsec_fallback_profile); | |
64 | if (nifp->source) | |
65 | free(nifp->source); | |
66 | ||
2fb975da TT |
67 | XFREE(MTYPE_NHRP_IF, ifp->info); |
68 | return 0; | |
69 | } | |
70 | ||
71 | void nhrp_interface_init(void) | |
72 | { | |
ce19a04a DL |
73 | hook_register_prio(if_add, 0, nhrp_if_new_hook); |
74 | hook_register_prio(if_del, 0, nhrp_if_delete_hook); | |
2fb975da TT |
75 | } |
76 | ||
77 | void nhrp_interface_update_mtu(struct interface *ifp, afi_t afi) | |
78 | { | |
79 | struct nhrp_interface *nifp = ifp->info; | |
80 | struct nhrp_afi_data *if_ad = &nifp->afi[afi]; | |
81 | unsigned short new_mtu; | |
82 | ||
83 | if (if_ad->configured_mtu < 0) | |
84 | new_mtu = nifp->nbmaifp ? nifp->nbmaifp->mtu : 0; | |
85 | else | |
86 | new_mtu = if_ad->configured_mtu; | |
87 | if (new_mtu >= 1500) | |
88 | new_mtu = 0; | |
89 | ||
90 | if (new_mtu != if_ad->mtu) { | |
996c9314 LB |
91 | debugf(NHRP_DEBUG_IF, "%s: MTU changed to %d", ifp->name, |
92 | new_mtu); | |
2fb975da | 93 | if_ad->mtu = new_mtu; |
996c9314 LB |
94 | notifier_call(&nifp->notifier_list, |
95 | NOTIFY_INTERFACE_MTU_CHANGED); | |
2fb975da TT |
96 | } |
97 | } | |
98 | ||
99 | static void nhrp_interface_update_source(struct interface *ifp) | |
100 | { | |
101 | struct nhrp_interface *nifp = ifp->info; | |
102 | ||
996c9314 LB |
103 | if (!nifp->source || !nifp->nbmaifp |
104 | || (ifindex_t)nifp->linkidx == nifp->nbmaifp->ifindex) | |
2fb975da TT |
105 | return; |
106 | ||
107 | nifp->linkidx = nifp->nbmaifp->ifindex; | |
996c9314 LB |
108 | debugf(NHRP_DEBUG_IF, "%s: bound device index changed to %d", ifp->name, |
109 | nifp->linkidx); | |
2fb975da TT |
110 | netlink_gre_set_link(ifp->ifindex, nifp->linkidx); |
111 | } | |
112 | ||
996c9314 LB |
113 | static void nhrp_interface_interface_notifier(struct notifier_block *n, |
114 | unsigned long cmd) | |
2fb975da | 115 | { |
996c9314 LB |
116 | struct nhrp_interface *nifp = |
117 | container_of(n, struct nhrp_interface, nbmanifp_notifier); | |
2fb975da TT |
118 | struct interface *nbmaifp = nifp->nbmaifp; |
119 | struct nhrp_interface *nbmanifp = nbmaifp->info; | |
2fb975da TT |
120 | |
121 | switch (cmd) { | |
122 | case NOTIFY_INTERFACE_CHANGED: | |
123 | nhrp_interface_update_mtu(nifp->ifp, AFI_IP); | |
124 | nhrp_interface_update_source(nifp->ifp); | |
125 | break; | |
126 | case NOTIFY_INTERFACE_ADDRESS_CHANGED: | |
127 | nifp->nbma = nbmanifp->afi[AFI_IP].addr; | |
128 | nhrp_interface_update(nifp->ifp); | |
996c9314 LB |
129 | notifier_call(&nifp->notifier_list, |
130 | NOTIFY_INTERFACE_NBMA_CHANGED); | |
b6c48481 DS |
131 | debugf(NHRP_DEBUG_IF, "%s: NBMA change: address %pSU", |
132 | nifp->ifp->name, &nifp->nbma); | |
2fb975da TT |
133 | break; |
134 | } | |
135 | } | |
136 | ||
137 | static void nhrp_interface_update_nbma(struct interface *ifp) | |
138 | { | |
139 | struct nhrp_interface *nifp = ifp->info, *nbmanifp = NULL; | |
140 | struct interface *nbmaifp = NULL; | |
141 | union sockunion nbma; | |
142 | ||
143 | sockunion_family(&nbma) = AF_UNSPEC; | |
144 | ||
145 | if (nifp->source) | |
a36898e7 | 146 | nbmaifp = if_lookup_by_name(nifp->source, VRF_DEFAULT); |
2fb975da TT |
147 | |
148 | switch (ifp->ll_type) { | |
149 | case ZEBRA_LLT_IPGRE: { | |
996c9314 LB |
150 | struct in_addr saddr = {0}; |
151 | netlink_gre_get_info(ifp->ifindex, &nifp->grekey, | |
152 | &nifp->linkidx, &saddr); | |
153 | debugf(NHRP_DEBUG_IF, "%s: GRE: %x %x %x", ifp->name, | |
154 | nifp->grekey, nifp->linkidx, saddr.s_addr); | |
975a328e | 155 | if (saddr.s_addr != INADDR_ANY) |
d7c0a89a | 156 | sockunion_set(&nbma, AF_INET, (uint8_t *)&saddr.s_addr, |
996c9314 LB |
157 | sizeof(saddr.s_addr)); |
158 | else if (!nbmaifp && nifp->linkidx != IFINDEX_INTERNAL) | |
159 | nbmaifp = | |
160 | if_lookup_by_index(nifp->linkidx, VRF_DEFAULT); | |
161 | } break; | |
2fb975da TT |
162 | default: |
163 | break; | |
164 | } | |
165 | ||
166 | if (nbmaifp) | |
167 | nbmanifp = nbmaifp->info; | |
168 | ||
169 | if (nbmaifp != nifp->nbmaifp) { | |
170 | if (nifp->nbmaifp) | |
171 | notifier_del(&nifp->nbmanifp_notifier); | |
172 | nifp->nbmaifp = nbmaifp; | |
173 | if (nbmaifp) { | |
996c9314 LB |
174 | notifier_add(&nifp->nbmanifp_notifier, |
175 | &nbmanifp->notifier_list, | |
176 | nhrp_interface_interface_notifier); | |
177 | debugf(NHRP_DEBUG_IF, "%s: bound to %s", ifp->name, | |
178 | nbmaifp->name); | |
2fb975da TT |
179 | } |
180 | } | |
181 | ||
182 | if (nbmaifp) { | |
183 | if (sockunion_family(&nbma) == AF_UNSPEC) | |
184 | nbma = nbmanifp->afi[AFI_IP].addr; | |
185 | nhrp_interface_update_mtu(ifp, AFI_IP); | |
186 | nhrp_interface_update_source(ifp); | |
187 | } | |
188 | ||
189 | if (!sockunion_same(&nbma, &nifp->nbma)) { | |
190 | nifp->nbma = nbma; | |
191 | nhrp_interface_update(nifp->ifp); | |
192 | debugf(NHRP_DEBUG_IF, "%s: NBMA address changed", ifp->name); | |
996c9314 LB |
193 | notifier_call(&nifp->notifier_list, |
194 | NOTIFY_INTERFACE_NBMA_CHANGED); | |
2fb975da TT |
195 | } |
196 | ||
197 | nhrp_interface_update(ifp); | |
198 | } | |
199 | ||
996c9314 LB |
200 | static void nhrp_interface_update_address(struct interface *ifp, afi_t afi, |
201 | int force) | |
2fb975da TT |
202 | { |
203 | const int family = afi2family(afi); | |
204 | struct nhrp_interface *nifp = ifp->info; | |
205 | struct nhrp_afi_data *if_ad = &nifp->afi[afi]; | |
206 | struct nhrp_cache *nc; | |
207 | struct connected *c, *best; | |
208 | struct listnode *cnode; | |
209 | union sockunion addr; | |
210 | char buf[PREFIX_STRLEN]; | |
211 | ||
212 | /* Select new best match preferring primary address */ | |
213 | best = NULL; | |
214 | for (ALL_LIST_ELEMENTS_RO(ifp->connected, cnode, c)) { | |
215 | if (PREFIX_FAMILY(c->address) != family) | |
216 | continue; | |
217 | if (best == NULL) { | |
218 | best = c; | |
219 | continue; | |
220 | } | |
996c9314 LB |
221 | if ((best->flags & ZEBRA_IFA_SECONDARY) |
222 | && !(c->flags & ZEBRA_IFA_SECONDARY)) { | |
2fb975da TT |
223 | best = c; |
224 | continue; | |
225 | } | |
996c9314 LB |
226 | if (!(best->flags & ZEBRA_IFA_SECONDARY) |
227 | && (c->flags & ZEBRA_IFA_SECONDARY)) | |
2fb975da TT |
228 | continue; |
229 | if (best->address->prefixlen > c->address->prefixlen) { | |
230 | best = c; | |
231 | continue; | |
232 | } | |
233 | if (best->address->prefixlen < c->address->prefixlen) | |
234 | continue; | |
235 | } | |
236 | ||
237 | /* On NHRP interfaces a host prefix is required */ | |
996c9314 LB |
238 | if (best && if_ad->configured |
239 | && best->address->prefixlen != 8 * prefix_blen(best->address)) { | |
2dbe669b DA |
240 | zlog_notice("%s: %pFX is not a host prefix", ifp->name, |
241 | best->address); | |
2fb975da TT |
242 | best = NULL; |
243 | } | |
244 | ||
245 | /* Update address if it changed */ | |
246 | if (best) | |
247 | prefix2sockunion(best->address, &addr); | |
248 | else | |
249 | memset(&addr, 0, sizeof(addr)); | |
250 | ||
251 | if (!force && sockunion_same(&if_ad->addr, &addr)) | |
252 | return; | |
253 | ||
254 | if (sockunion_family(&if_ad->addr) != AF_UNSPEC) { | |
255 | nc = nhrp_cache_get(ifp, &if_ad->addr, 0); | |
996c9314 LB |
256 | if (nc) |
257 | nhrp_cache_update_binding(nc, NHRP_CACHE_LOCAL, -1, | |
258 | NULL, 0, NULL); | |
2fb975da TT |
259 | } |
260 | ||
996c9314 LB |
261 | debugf(NHRP_DEBUG_KERNEL, "%s: IPv%d address changed to %s", ifp->name, |
262 | afi == AFI_IP ? 4 : 6, | |
0d6f7fd6 | 263 | best ? prefix2str(best->address, buf, sizeof(buf)) : "(none)"); |
2fb975da TT |
264 | if_ad->addr = addr; |
265 | ||
266 | if (if_ad->configured && sockunion_family(&if_ad->addr) != AF_UNSPEC) { | |
267 | nc = nhrp_cache_get(ifp, &addr, 1); | |
996c9314 LB |
268 | if (nc) |
269 | nhrp_cache_update_binding(nc, NHRP_CACHE_LOCAL, 0, NULL, | |
270 | 0, NULL); | |
2fb975da TT |
271 | } |
272 | ||
273 | notifier_call(&nifp->notifier_list, NOTIFY_INTERFACE_ADDRESS_CHANGED); | |
274 | } | |
275 | ||
276 | void nhrp_interface_update(struct interface *ifp) | |
277 | { | |
278 | struct nhrp_interface *nifp = ifp->info; | |
279 | struct nhrp_afi_data *if_ad; | |
280 | afi_t afi; | |
281 | int enabled = 0; | |
282 | ||
283 | notifier_call(&nifp->notifier_list, NOTIFY_INTERFACE_CHANGED); | |
284 | ||
285 | for (afi = 0; afi < AFI_MAX; afi++) { | |
286 | if_ad = &nifp->afi[afi]; | |
287 | ||
996c9314 LB |
288 | if (sockunion_family(&nifp->nbma) == AF_UNSPEC |
289 | || ifp->ifindex == IFINDEX_INTERNAL || !if_is_up(ifp) | |
290 | || !if_ad->network_id) { | |
2fb975da TT |
291 | if (if_ad->configured) { |
292 | if_ad->configured = 0; | |
293 | nhrp_interface_update_address(ifp, afi, 1); | |
294 | } | |
295 | continue; | |
296 | } | |
297 | ||
298 | if (!if_ad->configured) { | |
996c9314 LB |
299 | os_configure_dmvpn(ifp->ifindex, ifp->name, |
300 | afi2family(afi)); | |
2fb975da TT |
301 | if_ad->configured = 1; |
302 | nhrp_interface_update_address(ifp, afi, 1); | |
303 | } | |
304 | ||
305 | enabled = 1; | |
306 | } | |
307 | ||
308 | if (enabled != nifp->enabled) { | |
309 | nifp->enabled = enabled; | |
996c9314 LB |
310 | notifier_call(&nifp->notifier_list, |
311 | enabled ? NOTIFY_INTERFACE_UP | |
312 | : NOTIFY_INTERFACE_DOWN); | |
2fb975da TT |
313 | } |
314 | } | |
315 | ||
ef7bd2a3 | 316 | int nhrp_ifp_create(struct interface *ifp) |
2fb975da | 317 | { |
2fb975da | 318 | debugf(NHRP_DEBUG_IF, "if-add: %s, ifindex: %u, hw_type: %d %s", |
996c9314 LB |
319 | ifp->name, ifp->ifindex, ifp->ll_type, |
320 | if_link_type_str(ifp->ll_type)); | |
2fb975da TT |
321 | |
322 | nhrp_interface_update_nbma(ifp); | |
323 | ||
324 | return 0; | |
325 | } | |
326 | ||
3c3c3252 | 327 | int nhrp_ifp_destroy(struct interface *ifp) |
2fb975da | 328 | { |
2fb975da | 329 | debugf(NHRP_DEBUG_IF, "if-delete: %s", ifp->name); |
9d6c33ea | 330 | |
fef2ed13 PG |
331 | nhrp_interface_update_cache_config(ifp, false, AF_INET); |
332 | nhrp_interface_update_cache_config(ifp, false, AF_INET6); | |
2fb975da | 333 | nhrp_interface_update(ifp); |
9d6c33ea | 334 | |
2fb975da TT |
335 | return 0; |
336 | } | |
337 | ||
fef2ed13 PG |
338 | struct map_ctx { |
339 | int family; | |
340 | bool enabled; | |
341 | }; | |
342 | ||
e5773617 MS |
343 | static void interface_config_update_nhrp_map(struct nhrp_cache_config *cc, |
344 | void *data) | |
fef2ed13 PG |
345 | { |
346 | struct map_ctx *ctx = data; | |
347 | struct interface *ifp = cc->ifp; | |
348 | struct nhrp_cache *c; | |
349 | union sockunion nbma_addr; | |
350 | ||
351 | if (sockunion_family(&cc->remote_addr) != ctx->family) | |
352 | return; | |
353 | ||
354 | /* gre layer not ready */ | |
355 | if (ifp->vrf_id == VRF_UNKNOWN) | |
356 | return; | |
357 | ||
358 | c = nhrp_cache_get(ifp, &cc->remote_addr, ctx->enabled ? 1 : 0); | |
359 | if (!c && !ctx->enabled) | |
360 | return; | |
e5773617 | 361 | |
fef2ed13 PG |
362 | /* suppress */ |
363 | if (!ctx->enabled) { | |
364 | if (c && c->map) { | |
e5773617 MS |
365 | nhrp_cache_update_binding( |
366 | c, c->cur.type, -1, | |
367 | nhrp_peer_get(ifp, &nbma_addr), 0, NULL); | |
fef2ed13 PG |
368 | } |
369 | return; | |
370 | } | |
e5773617 MS |
371 | |
372 | /* Newly created */ | |
373 | assert(c != NULL); | |
374 | ||
fef2ed13 PG |
375 | c->map = 1; |
376 | if (cc->type == NHRP_CACHE_LOCAL) | |
377 | nhrp_cache_update_binding(c, NHRP_CACHE_LOCAL, 0, NULL, 0, | |
378 | NULL); | |
379 | else { | |
380 | nhrp_cache_update_binding(c, NHRP_CACHE_STATIC, 0, | |
381 | nhrp_peer_get(ifp, &cc->nbma), 0, | |
382 | NULL); | |
383 | } | |
384 | } | |
385 | ||
386 | static void nhrp_interface_update_cache_config(struct interface *ifp, bool available, uint8_t family) | |
387 | { | |
388 | struct map_ctx mapctx; | |
389 | ||
390 | mapctx = (struct map_ctx){ | |
391 | .family = family, | |
392 | .enabled = available | |
393 | }; | |
394 | nhrp_cache_config_foreach(ifp, interface_config_update_nhrp_map, | |
395 | &mapctx); | |
396 | ||
397 | } | |
398 | ||
ddbf3e60 | 399 | int nhrp_ifp_up(struct interface *ifp) |
2fb975da | 400 | { |
2fb975da TT |
401 | debugf(NHRP_DEBUG_IF, "if-up: %s", ifp->name); |
402 | nhrp_interface_update_nbma(ifp); | |
403 | ||
404 | return 0; | |
405 | } | |
406 | ||
b0b69e59 | 407 | int nhrp_ifp_down(struct interface *ifp) |
2fb975da | 408 | { |
2fb975da TT |
409 | debugf(NHRP_DEBUG_IF, "if-down: %s", ifp->name); |
410 | nhrp_interface_update(ifp); | |
b0b69e59 | 411 | |
2fb975da TT |
412 | return 0; |
413 | } | |
414 | ||
121f9dee | 415 | int nhrp_interface_address_add(ZAPI_CALLBACK_ARGS) |
2fb975da TT |
416 | { |
417 | struct connected *ifc; | |
2fb975da | 418 | |
121f9dee | 419 | ifc = zebra_interface_address_read(cmd, zclient->ibuf, vrf_id); |
2fb975da TT |
420 | if (ifc == NULL) |
421 | return 0; | |
422 | ||
2dbe669b DA |
423 | debugf(NHRP_DEBUG_IF, "if-addr-add: %s: %pFX", ifc->ifp->name, |
424 | ifc->address); | |
2fb975da | 425 | |
996c9314 LB |
426 | nhrp_interface_update_address( |
427 | ifc->ifp, family2afi(PREFIX_FAMILY(ifc->address)), 0); | |
fef2ed13 | 428 | nhrp_interface_update_cache_config(ifc->ifp, true, PREFIX_FAMILY(ifc->address)); |
2fb975da TT |
429 | return 0; |
430 | } | |
431 | ||
121f9dee | 432 | int nhrp_interface_address_delete(ZAPI_CALLBACK_ARGS) |
2fb975da TT |
433 | { |
434 | struct connected *ifc; | |
2fb975da | 435 | |
121f9dee | 436 | ifc = zebra_interface_address_read(cmd, zclient->ibuf, vrf_id); |
2fb975da TT |
437 | if (ifc == NULL) |
438 | return 0; | |
439 | ||
2dbe669b DA |
440 | debugf(NHRP_DEBUG_IF, "if-addr-del: %s: %pFX", ifc->ifp->name, |
441 | ifc->address); | |
2fb975da | 442 | |
996c9314 LB |
443 | nhrp_interface_update_address( |
444 | ifc->ifp, family2afi(PREFIX_FAMILY(ifc->address)), 0); | |
721c0857 | 445 | connected_free(&ifc); |
2fb975da TT |
446 | |
447 | return 0; | |
448 | } | |
449 | ||
996c9314 LB |
450 | void nhrp_interface_notify_add(struct interface *ifp, struct notifier_block *n, |
451 | notifier_fn_t fn) | |
2fb975da TT |
452 | { |
453 | struct nhrp_interface *nifp = ifp->info; | |
454 | notifier_add(n, &nifp->notifier_list, fn); | |
455 | } | |
456 | ||
457 | void nhrp_interface_notify_del(struct interface *ifp, struct notifier_block *n) | |
458 | { | |
459 | notifier_del(n); | |
460 | } | |
461 | ||
996c9314 LB |
462 | void nhrp_interface_set_protection(struct interface *ifp, const char *profile, |
463 | const char *fallback_profile) | |
2fb975da TT |
464 | { |
465 | struct nhrp_interface *nifp = ifp->info; | |
466 | ||
996c9314 | 467 | if (nifp->ipsec_profile) |
083bbfae GG |
468 | { |
469 | vici_terminate_vc_by_profile_name(nifp->ipsec_profile); | |
996c9314 | 470 | free(nifp->ipsec_profile); |
083bbfae | 471 | } |
2fb975da TT |
472 | nifp->ipsec_profile = profile ? strdup(profile) : NULL; |
473 | ||
996c9314 | 474 | if (nifp->ipsec_fallback_profile) |
083bbfae GG |
475 | { |
476 | vici_terminate_vc_by_profile_name(nifp->ipsec_fallback_profile); | |
996c9314 | 477 | free(nifp->ipsec_fallback_profile); |
083bbfae | 478 | } |
996c9314 LB |
479 | nifp->ipsec_fallback_profile = |
480 | fallback_profile ? strdup(fallback_profile) : NULL; | |
111aec1e TT |
481 | |
482 | notifier_call(&nifp->notifier_list, NOTIFY_INTERFACE_ADDRESS_CHANGED); | |
2fb975da TT |
483 | } |
484 | ||
485 | void nhrp_interface_set_source(struct interface *ifp, const char *ifname) | |
486 | { | |
487 | struct nhrp_interface *nifp = ifp->info; | |
488 | ||
996c9314 LB |
489 | if (nifp->source) |
490 | free(nifp->source); | |
2fb975da TT |
491 | nifp->source = ifname ? strdup(ifname) : NULL; |
492 | ||
493 | nhrp_interface_update_nbma(ifp); | |
494 | } |