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2fb975da TT |
1 | /* NHRP cache |
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 | ||
10 | #include "zebra.h" | |
11 | #include "memory.h" | |
12 | #include "thread.h" | |
13 | #include "hash.h" | |
14 | #include "nhrpd.h" | |
15 | ||
16 | #include "netlink.h" | |
17 | ||
819dc8bb DL |
18 | DEFINE_MTYPE_STATIC(NHRPD, NHRP_CACHE, "NHRP cache entry") |
19 | ||
2fb975da TT |
20 | unsigned long nhrp_cache_counts[NHRP_CACHE_NUM_TYPES]; |
21 | ||
996c9314 LB |
22 | const char *const nhrp_cache_type_str[] = { |
23 | [NHRP_CACHE_INVALID] = "invalid", | |
24 | [NHRP_CACHE_INCOMPLETE] = "incomplete", | |
25 | [NHRP_CACHE_NEGATIVE] = "negative", | |
26 | [NHRP_CACHE_CACHED] = "cached", | |
27 | [NHRP_CACHE_DYNAMIC] = "dynamic", | |
28 | [NHRP_CACHE_NHS] = "nhs", | |
29 | [NHRP_CACHE_STATIC] = "static", | |
30 | [NHRP_CACHE_LOCAL] = "local", | |
2fb975da TT |
31 | }; |
32 | ||
33 | static unsigned int nhrp_cache_protocol_key(void *peer_data) | |
34 | { | |
35 | struct nhrp_cache *p = peer_data; | |
36 | return sockunion_hash(&p->remote_addr); | |
37 | } | |
38 | ||
74df8d6d DS |
39 | static bool nhrp_cache_protocol_cmp(const void *cache_data, |
40 | const void *key_data) | |
2fb975da TT |
41 | { |
42 | const struct nhrp_cache *a = cache_data; | |
43 | const struct nhrp_cache *b = key_data; | |
74df8d6d | 44 | |
2fb975da TT |
45 | return sockunion_same(&a->remote_addr, &b->remote_addr); |
46 | } | |
47 | ||
48 | static void *nhrp_cache_alloc(void *data) | |
49 | { | |
50 | struct nhrp_cache *p, *key = data; | |
51 | ||
52 | p = XMALLOC(MTYPE_NHRP_CACHE, sizeof(struct nhrp_cache)); | |
0ce1ca80 DS |
53 | |
54 | *p = (struct nhrp_cache){ | |
55 | .cur.type = NHRP_CACHE_INVALID, | |
56 | .new.type = NHRP_CACHE_INVALID, | |
57 | .remote_addr = key->remote_addr, | |
58 | .ifp = key->ifp, | |
59 | .notifier_list = | |
60 | NOTIFIER_LIST_INITIALIZER(&p->notifier_list), | |
61 | }; | |
62 | nhrp_cache_counts[p->cur.type]++; | |
2fb975da TT |
63 | |
64 | return p; | |
65 | } | |
66 | ||
67 | static void nhrp_cache_free(struct nhrp_cache *c) | |
68 | { | |
69 | struct nhrp_interface *nifp = c->ifp->info; | |
70 | ||
71 | zassert(c->cur.type == NHRP_CACHE_INVALID && c->cur.peer == NULL); | |
72 | zassert(c->new.type == NHRP_CACHE_INVALID && c->new.peer == NULL); | |
73 | nhrp_cache_counts[c->cur.type]--; | |
74 | notifier_call(&c->notifier_list, NOTIFY_CACHE_DELETE); | |
75 | zassert(!notifier_active(&c->notifier_list)); | |
76 | hash_release(nifp->cache_hash, c); | |
77 | XFREE(MTYPE_NHRP_CACHE, c); | |
78 | } | |
79 | ||
996c9314 LB |
80 | struct nhrp_cache *nhrp_cache_get(struct interface *ifp, |
81 | union sockunion *remote_addr, int create) | |
2fb975da TT |
82 | { |
83 | struct nhrp_interface *nifp = ifp->info; | |
84 | struct nhrp_cache key; | |
85 | ||
86 | if (!nifp->cache_hash) { | |
996c9314 LB |
87 | nifp->cache_hash = |
88 | hash_create(nhrp_cache_protocol_key, | |
89 | nhrp_cache_protocol_cmp, "NHRP Cache"); | |
2fb975da TT |
90 | if (!nifp->cache_hash) |
91 | return NULL; | |
92 | } | |
93 | ||
94 | key.remote_addr = *remote_addr; | |
95 | key.ifp = ifp; | |
96 | ||
996c9314 LB |
97 | return hash_get(nifp->cache_hash, &key, |
98 | create ? nhrp_cache_alloc : NULL); | |
2fb975da TT |
99 | } |
100 | ||
101 | static int nhrp_cache_do_free(struct thread *t) | |
102 | { | |
103 | struct nhrp_cache *c = THREAD_ARG(t); | |
104 | c->t_timeout = NULL; | |
105 | nhrp_cache_free(c); | |
106 | return 0; | |
107 | } | |
108 | ||
109 | static int nhrp_cache_do_timeout(struct thread *t) | |
110 | { | |
111 | struct nhrp_cache *c = THREAD_ARG(t); | |
112 | c->t_timeout = NULL; | |
113 | if (c->cur.type != NHRP_CACHE_INVALID) | |
114 | nhrp_cache_update_binding(c, c->cur.type, -1, NULL, 0, NULL); | |
115 | return 0; | |
116 | } | |
117 | ||
118 | static void nhrp_cache_update_route(struct nhrp_cache *c) | |
119 | { | |
120 | struct prefix pfx; | |
121 | struct nhrp_peer *p = c->cur.peer; | |
122 | ||
123 | sockunion2hostprefix(&c->remote_addr, &pfx); | |
124 | ||
125 | if (p && nhrp_peer_check(p, 1)) { | |
996c9314 LB |
126 | netlink_update_binding(p->ifp, &c->remote_addr, |
127 | &p->vc->remote.nbma); | |
128 | nhrp_route_announce(1, c->cur.type, &pfx, c->ifp, NULL, | |
129 | c->cur.mtu); | |
2fb975da TT |
130 | if (c->cur.type >= NHRP_CACHE_DYNAMIC) { |
131 | nhrp_route_update_nhrp(&pfx, c->ifp); | |
132 | c->nhrp_route_installed = 1; | |
133 | } else if (c->nhrp_route_installed) { | |
134 | nhrp_route_update_nhrp(&pfx, NULL); | |
135 | c->nhrp_route_installed = 0; | |
136 | } | |
137 | if (!c->route_installed) { | |
138 | notifier_call(&c->notifier_list, NOTIFY_CACHE_UP); | |
139 | c->route_installed = 1; | |
140 | } | |
141 | } else { | |
142 | if (c->nhrp_route_installed) { | |
143 | nhrp_route_update_nhrp(&pfx, NULL); | |
144 | c->nhrp_route_installed = 0; | |
145 | } | |
146 | if (c->route_installed) { | |
147 | sockunion2hostprefix(&c->remote_addr, &pfx); | |
148 | notifier_call(&c->notifier_list, NOTIFY_CACHE_DOWN); | |
996c9314 LB |
149 | nhrp_route_announce(0, c->cur.type, &pfx, NULL, NULL, |
150 | 0); | |
2fb975da TT |
151 | c->route_installed = 0; |
152 | } | |
153 | } | |
154 | } | |
155 | ||
996c9314 LB |
156 | static void nhrp_cache_peer_notifier(struct notifier_block *n, |
157 | unsigned long cmd) | |
2fb975da | 158 | { |
996c9314 LB |
159 | struct nhrp_cache *c = |
160 | container_of(n, struct nhrp_cache, peer_notifier); | |
2fb975da TT |
161 | |
162 | switch (cmd) { | |
163 | case NOTIFY_PEER_UP: | |
164 | nhrp_cache_update_route(c); | |
165 | break; | |
166 | case NOTIFY_PEER_DOWN: | |
167 | case NOTIFY_PEER_IFCONFIG_CHANGED: | |
168 | notifier_call(&c->notifier_list, NOTIFY_CACHE_DOWN); | |
169 | nhrp_cache_update_binding(c, c->cur.type, -1, NULL, 0, NULL); | |
170 | break; | |
171 | case NOTIFY_PEER_NBMA_CHANGING: | |
172 | if (c->cur.type == NHRP_CACHE_DYNAMIC) | |
173 | c->cur.peer->vc->abort_migration = 1; | |
174 | break; | |
175 | } | |
176 | } | |
177 | ||
178 | static void nhrp_cache_reset_new(struct nhrp_cache *c) | |
179 | { | |
180 | THREAD_OFF(c->t_auth); | |
181 | if (list_hashed(&c->newpeer_notifier.notifier_entry)) | |
182 | nhrp_peer_notify_del(c->new.peer, &c->newpeer_notifier); | |
183 | nhrp_peer_unref(c->new.peer); | |
184 | memset(&c->new, 0, sizeof(c->new)); | |
185 | c->new.type = NHRP_CACHE_INVALID; | |
186 | } | |
187 | ||
188 | static void nhrp_cache_update_timers(struct nhrp_cache *c) | |
189 | { | |
190 | THREAD_OFF(c->t_timeout); | |
191 | ||
192 | switch (c->cur.type) { | |
193 | case NHRP_CACHE_INVALID: | |
194 | if (!c->t_auth) | |
996c9314 LB |
195 | thread_add_timer_msec(master, nhrp_cache_do_free, c, 10, |
196 | &c->t_timeout); | |
2fb975da TT |
197 | break; |
198 | default: | |
199 | if (c->cur.expires) | |
ffa2c898 QY |
200 | thread_add_timer(master, nhrp_cache_do_timeout, c, |
201 | c->cur.expires - monotime(NULL), | |
202 | &c->t_timeout); | |
2fb975da TT |
203 | break; |
204 | } | |
205 | } | |
206 | ||
207 | static void nhrp_cache_authorize_binding(struct nhrp_reqid *r, void *arg) | |
208 | { | |
209 | struct nhrp_cache *c = container_of(r, struct nhrp_cache, eventid); | |
210 | char buf[SU_ADDRSTRLEN]; | |
211 | ||
996c9314 LB |
212 | debugf(NHRP_DEBUG_COMMON, "cache: %s %s: %s", c->ifp->name, |
213 | sockunion2str(&c->remote_addr, buf, sizeof buf), | |
214 | (const char *)arg); | |
2fb975da TT |
215 | |
216 | nhrp_reqid_free(&nhrp_event_reqid, r); | |
217 | ||
218 | if (arg && strcmp(arg, "accept") == 0) { | |
219 | if (c->cur.peer) { | |
996c9314 LB |
220 | netlink_update_binding(c->cur.peer->ifp, |
221 | &c->remote_addr, NULL); | |
2fb975da TT |
222 | nhrp_peer_notify_del(c->cur.peer, &c->peer_notifier); |
223 | nhrp_peer_unref(c->cur.peer); | |
224 | } | |
225 | nhrp_cache_counts[c->cur.type]--; | |
226 | nhrp_cache_counts[c->new.type]++; | |
227 | c->cur = c->new; | |
228 | c->cur.peer = nhrp_peer_ref(c->cur.peer); | |
229 | nhrp_cache_reset_new(c); | |
230 | if (c->cur.peer) | |
996c9314 LB |
231 | nhrp_peer_notify_add(c->cur.peer, &c->peer_notifier, |
232 | nhrp_cache_peer_notifier); | |
2fb975da TT |
233 | nhrp_cache_update_route(c); |
234 | notifier_call(&c->notifier_list, NOTIFY_CACHE_BINDING_CHANGE); | |
235 | } else { | |
236 | nhrp_cache_reset_new(c); | |
237 | } | |
238 | ||
239 | nhrp_cache_update_timers(c); | |
240 | } | |
241 | ||
242 | static int nhrp_cache_do_auth_timeout(struct thread *t) | |
243 | { | |
244 | struct nhrp_cache *c = THREAD_ARG(t); | |
245 | c->t_auth = NULL; | |
996c9314 | 246 | nhrp_cache_authorize_binding(&c->eventid, (void *)"timeout"); |
2fb975da TT |
247 | return 0; |
248 | } | |
249 | ||
996c9314 LB |
250 | static void nhrp_cache_newpeer_notifier(struct notifier_block *n, |
251 | unsigned long cmd) | |
2fb975da | 252 | { |
996c9314 LB |
253 | struct nhrp_cache *c = |
254 | container_of(n, struct nhrp_cache, newpeer_notifier); | |
2fb975da TT |
255 | |
256 | switch (cmd) { | |
257 | case NOTIFY_PEER_UP: | |
258 | if (nhrp_peer_check(c->new.peer, 1)) { | |
996c9314 LB |
259 | evmgr_notify("authorize-binding", c, |
260 | nhrp_cache_authorize_binding); | |
261 | thread_add_timer(master, nhrp_cache_do_auth_timeout, c, | |
262 | 10, &c->t_auth); | |
2fb975da TT |
263 | } |
264 | break; | |
265 | case NOTIFY_PEER_DOWN: | |
266 | case NOTIFY_PEER_IFCONFIG_CHANGED: | |
267 | nhrp_cache_reset_new(c); | |
268 | break; | |
269 | } | |
270 | } | |
271 | ||
996c9314 LB |
272 | int nhrp_cache_update_binding(struct nhrp_cache *c, enum nhrp_cache_type type, |
273 | int holding_time, struct nhrp_peer *p, | |
274 | uint32_t mtu, union sockunion *nbma_oa) | |
2fb975da TT |
275 | { |
276 | if (c->cur.type > type || c->new.type > type) { | |
277 | nhrp_peer_unref(p); | |
278 | return 0; | |
279 | } | |
280 | ||
281 | /* Sanitize MTU */ | |
282 | switch (sockunion_family(&c->remote_addr)) { | |
283 | case AF_INET: | |
284 | if (mtu < 576 || mtu >= 1500) | |
285 | mtu = 0; | |
286 | /* Opennhrp announces nbma mtu, but we use protocol mtu. | |
287 | * This heuristic tries to fix up it. */ | |
996c9314 LB |
288 | if (mtu > 1420) |
289 | mtu = (mtu & -16) - 80; | |
2fb975da TT |
290 | break; |
291 | default: | |
292 | mtu = 0; | |
293 | break; | |
294 | } | |
295 | ||
296 | nhrp_cache_reset_new(c); | |
297 | if (c->cur.type == type && c->cur.peer == p && c->cur.mtu == mtu) { | |
996c9314 LB |
298 | if (holding_time > 0) |
299 | c->cur.expires = monotime(NULL) + holding_time; | |
300 | if (nbma_oa) | |
301 | c->cur.remote_nbma_natoa = *nbma_oa; | |
302 | else | |
303 | memset(&c->cur.remote_nbma_natoa, 0, | |
304 | sizeof c->cur.remote_nbma_natoa); | |
2fb975da TT |
305 | nhrp_peer_unref(p); |
306 | } else { | |
307 | c->new.type = type; | |
308 | c->new.peer = p; | |
309 | c->new.mtu = mtu; | |
996c9314 LB |
310 | if (nbma_oa) |
311 | c->new.remote_nbma_natoa = *nbma_oa; | |
2fb975da TT |
312 | |
313 | if (holding_time > 0) | |
819dc8bb | 314 | c->new.expires = monotime(NULL) + holding_time; |
2fb975da | 315 | else if (holding_time < 0) |
45c8b07a | 316 | nhrp_cache_reset_new(c); |
2fb975da | 317 | |
996c9314 LB |
318 | if (c->new.type == NHRP_CACHE_INVALID |
319 | || c->new.type >= NHRP_CACHE_STATIC || c->map) { | |
320 | nhrp_cache_authorize_binding(&c->eventid, | |
321 | (void *)"accept"); | |
2fb975da | 322 | } else { |
996c9314 LB |
323 | nhrp_peer_notify_add(c->new.peer, &c->newpeer_notifier, |
324 | nhrp_cache_newpeer_notifier); | |
325 | nhrp_cache_newpeer_notifier(&c->newpeer_notifier, | |
326 | NOTIFY_PEER_UP); | |
327 | thread_add_timer(master, nhrp_cache_do_auth_timeout, c, | |
328 | 60, &c->t_auth); | |
2fb975da TT |
329 | } |
330 | } | |
331 | nhrp_cache_update_timers(c); | |
332 | ||
333 | return 1; | |
334 | } | |
335 | ||
336 | void nhrp_cache_set_used(struct nhrp_cache *c, int used) | |
337 | { | |
338 | c->used = used; | |
339 | if (c->used) | |
340 | notifier_call(&c->notifier_list, NOTIFY_CACHE_USED); | |
341 | } | |
342 | ||
343 | struct nhrp_cache_iterator_ctx { | |
344 | void (*cb)(struct nhrp_cache *, void *); | |
345 | void *ctx; | |
346 | }; | |
347 | ||
e3b78da8 | 348 | static void nhrp_cache_iterator(struct hash_bucket *b, void *ctx) |
2fb975da TT |
349 | { |
350 | struct nhrp_cache_iterator_ctx *ic = ctx; | |
351 | ic->cb(b->data, ic->ctx); | |
352 | } | |
353 | ||
996c9314 LB |
354 | void nhrp_cache_foreach(struct interface *ifp, |
355 | void (*cb)(struct nhrp_cache *, void *), void *ctx) | |
2fb975da TT |
356 | { |
357 | struct nhrp_interface *nifp = ifp->info; | |
358 | struct nhrp_cache_iterator_ctx ic = { | |
996c9314 | 359 | .cb = cb, .ctx = ctx, |
2fb975da TT |
360 | }; |
361 | ||
362 | if (nifp->cache_hash) | |
363 | hash_iterate(nifp->cache_hash, nhrp_cache_iterator, &ic); | |
364 | } | |
365 | ||
996c9314 LB |
366 | void nhrp_cache_notify_add(struct nhrp_cache *c, struct notifier_block *n, |
367 | notifier_fn_t fn) | |
2fb975da TT |
368 | { |
369 | notifier_add(n, &c->notifier_list, fn); | |
370 | } | |
371 | ||
372 | void nhrp_cache_notify_del(struct nhrp_cache *c, struct notifier_block *n) | |
373 | { | |
374 | notifier_del(n); | |
375 | } |