Commit | Line | Data |
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2e3c8736 LCC |
1 | /* |
2 | * Copyright (c) 2008 open80211s Ltd. | |
3 | * Authors: Luis Carlos Cobo <luisca@cozybit.com> | |
4 | * Javier Cardona <javier@cozybit.com> | |
5 | * | |
6 | * This program is free software; you can redistribute it and/or modify | |
7 | * it under the terms of the GNU General Public License version 2 as | |
8 | * published by the Free Software Foundation. | |
9 | */ | |
10 | ||
51ceddad | 11 | #include <asm/unaligned.h> |
2e3c8736 LCC |
12 | #include "ieee80211_i.h" |
13 | #include "mesh.h" | |
14 | ||
472dbc45 JB |
15 | #define IEEE80211_MESH_PEER_INACTIVITY_LIMIT (1800 * HZ) |
16 | #define IEEE80211_MESH_HOUSEKEEPING_INTERVAL (60 * HZ) | |
17 | ||
24736701 JL |
18 | #define PP_OFFSET 1 /* Path Selection Protocol */ |
19 | #define PM_OFFSET 5 /* Path Selection Metric */ | |
20 | #define CC_OFFSET 9 /* Congestion Control Mode */ | |
21 | #define CAPAB_OFFSET 17 | |
2e3c8736 LCC |
22 | #define ACCEPT_PLINKS 0x80 |
23 | ||
5bb644a0 JB |
24 | #define TMR_RUNNING_HK 0 |
25 | #define TMR_RUNNING_MP 1 | |
26 | ||
2e3c8736 LCC |
27 | int mesh_allocated; |
28 | static struct kmem_cache *rm_cache; | |
29 | ||
30 | void ieee80211s_init(void) | |
31 | { | |
32 | mesh_pathtbl_init(); | |
33 | mesh_allocated = 1; | |
34 | rm_cache = kmem_cache_create("mesh_rmc", sizeof(struct rmc_entry), | |
35 | 0, 0, NULL); | |
36 | } | |
37 | ||
38 | void ieee80211s_stop(void) | |
39 | { | |
40 | mesh_pathtbl_unregister(); | |
41 | kmem_cache_destroy(rm_cache); | |
42 | } | |
43 | ||
472dbc45 JB |
44 | static void ieee80211_mesh_housekeeping_timer(unsigned long data) |
45 | { | |
46 | struct ieee80211_sub_if_data *sdata = (void *) data; | |
47 | struct ieee80211_local *local = sdata->local; | |
48 | struct ieee80211_if_mesh *ifmsh = &sdata->u.mesh; | |
49 | ||
50 | ifmsh->housekeeping = true; | |
5bb644a0 JB |
51 | |
52 | if (local->quiescing) { | |
53 | set_bit(TMR_RUNNING_HK, &ifmsh->timers_running); | |
54 | return; | |
55 | } | |
56 | ||
472dbc45 JB |
57 | queue_work(local->hw.workqueue, &ifmsh->work); |
58 | } | |
59 | ||
2e3c8736 LCC |
60 | /** |
61 | * mesh_matches_local - check if the config of a mesh point matches ours | |
62 | * | |
63 | * @ie: information elements of a management frame from the mesh peer | |
f698d856 | 64 | * @sdata: local mesh subif |
2e3c8736 LCC |
65 | * |
66 | * This function checks if the mesh configuration of a mesh point matches the | |
67 | * local mesh configuration, i.e. if both nodes belong to the same mesh network. | |
68 | */ | |
f698d856 | 69 | bool mesh_matches_local(struct ieee802_11_elems *ie, struct ieee80211_sub_if_data *sdata) |
2e3c8736 | 70 | { |
472dbc45 | 71 | struct ieee80211_if_mesh *ifmsh = &sdata->u.mesh; |
2e3c8736 | 72 | |
2e3c8736 LCC |
73 | /* |
74 | * As support for each feature is added, check for matching | |
75 | * - On mesh config capabilities | |
76 | * - Power Save Support En | |
77 | * - Sync support enabled | |
78 | * - Sync support active | |
79 | * - Sync support required from peer | |
80 | * - MDA enabled | |
81 | * - Power management control on fc | |
82 | */ | |
472dbc45 JB |
83 | if (ifmsh->mesh_id_len == ie->mesh_id_len && |
84 | memcmp(ifmsh->mesh_id, ie->mesh_id, ie->mesh_id_len) == 0 && | |
85 | memcmp(ifmsh->mesh_pp_id, ie->mesh_config + PP_OFFSET, 4) == 0 && | |
86 | memcmp(ifmsh->mesh_pm_id, ie->mesh_config + PM_OFFSET, 4) == 0 && | |
87 | memcmp(ifmsh->mesh_cc_id, ie->mesh_config + CC_OFFSET, 4) == 0) | |
2e3c8736 LCC |
88 | return true; |
89 | ||
90 | return false; | |
91 | } | |
92 | ||
93 | /** | |
94 | * mesh_peer_accepts_plinks - check if an mp is willing to establish peer links | |
95 | * | |
96 | * @ie: information elements of a management frame from the mesh peer | |
2e3c8736 | 97 | */ |
f698d856 | 98 | bool mesh_peer_accepts_plinks(struct ieee802_11_elems *ie) |
2e3c8736 LCC |
99 | { |
100 | return (*(ie->mesh_config + CAPAB_OFFSET) & ACCEPT_PLINKS) != 0; | |
101 | } | |
102 | ||
103 | /** | |
104 | * mesh_accept_plinks_update: update accepting_plink in local mesh beacons | |
105 | * | |
d0709a65 | 106 | * @sdata: mesh interface in which mesh beacons are going to be updated |
2e3c8736 | 107 | */ |
d0709a65 | 108 | void mesh_accept_plinks_update(struct ieee80211_sub_if_data *sdata) |
2e3c8736 | 109 | { |
2e3c8736 LCC |
110 | bool free_plinks; |
111 | ||
112 | /* In case mesh_plink_free_count > 0 and mesh_plinktbl_capacity == 0, | |
113 | * the mesh interface might be able to establish plinks with peers that | |
b4e08ea1 LCC |
114 | * are already on the table but are not on PLINK_ESTAB state. However, |
115 | * in general the mesh interface is not accepting peer link requests | |
116 | * from new peers, and that must be reflected in the beacon | |
2e3c8736 LCC |
117 | */ |
118 | free_plinks = mesh_plink_availables(sdata); | |
119 | ||
472dbc45 JB |
120 | if (free_plinks != sdata->u.mesh.accepting_plinks) |
121 | ieee80211_mesh_housekeeping_timer((unsigned long) sdata); | |
2e3c8736 LCC |
122 | } |
123 | ||
472dbc45 | 124 | void mesh_ids_set_default(struct ieee80211_if_mesh *sta) |
2e3c8736 LCC |
125 | { |
126 | u8 def_id[4] = {0x00, 0x0F, 0xAC, 0xff}; | |
127 | ||
128 | memcpy(sta->mesh_pp_id, def_id, 4); | |
129 | memcpy(sta->mesh_pm_id, def_id, 4); | |
130 | memcpy(sta->mesh_cc_id, def_id, 4); | |
131 | } | |
132 | ||
f698d856 | 133 | int mesh_rmc_init(struct ieee80211_sub_if_data *sdata) |
2e3c8736 | 134 | { |
2e3c8736 LCC |
135 | int i; |
136 | ||
472dbc45 JB |
137 | sdata->u.mesh.rmc = kmalloc(sizeof(struct mesh_rmc), GFP_KERNEL); |
138 | if (!sdata->u.mesh.rmc) | |
2e3c8736 | 139 | return -ENOMEM; |
472dbc45 | 140 | sdata->u.mesh.rmc->idx_mask = RMC_BUCKETS - 1; |
2e3c8736 | 141 | for (i = 0; i < RMC_BUCKETS; i++) |
472dbc45 | 142 | INIT_LIST_HEAD(&sdata->u.mesh.rmc->bucket[i].list); |
2e3c8736 LCC |
143 | return 0; |
144 | } | |
145 | ||
f698d856 | 146 | void mesh_rmc_free(struct ieee80211_sub_if_data *sdata) |
2e3c8736 | 147 | { |
472dbc45 | 148 | struct mesh_rmc *rmc = sdata->u.mesh.rmc; |
2e3c8736 LCC |
149 | struct rmc_entry *p, *n; |
150 | int i; | |
151 | ||
472dbc45 | 152 | if (!sdata->u.mesh.rmc) |
2e3c8736 LCC |
153 | return; |
154 | ||
155 | for (i = 0; i < RMC_BUCKETS; i++) | |
156 | list_for_each_entry_safe(p, n, &rmc->bucket[i].list, list) { | |
157 | list_del(&p->list); | |
158 | kmem_cache_free(rm_cache, p); | |
159 | } | |
160 | ||
161 | kfree(rmc); | |
472dbc45 | 162 | sdata->u.mesh.rmc = NULL; |
2e3c8736 LCC |
163 | } |
164 | ||
165 | /** | |
166 | * mesh_rmc_check - Check frame in recent multicast cache and add if absent. | |
167 | * | |
168 | * @sa: source address | |
169 | * @mesh_hdr: mesh_header | |
170 | * | |
171 | * Returns: 0 if the frame is not in the cache, nonzero otherwise. | |
172 | * | |
173 | * Checks using the source address and the mesh sequence number if we have | |
174 | * received this frame lately. If the frame is not in the cache, it is added to | |
175 | * it. | |
176 | */ | |
177 | int mesh_rmc_check(u8 *sa, struct ieee80211s_hdr *mesh_hdr, | |
f698d856 | 178 | struct ieee80211_sub_if_data *sdata) |
2e3c8736 | 179 | { |
472dbc45 | 180 | struct mesh_rmc *rmc = sdata->u.mesh.rmc; |
2e3c8736 LCC |
181 | u32 seqnum = 0; |
182 | int entries = 0; | |
183 | u8 idx; | |
184 | struct rmc_entry *p, *n; | |
185 | ||
186 | /* Don't care about endianness since only match matters */ | |
51ceddad LCC |
187 | memcpy(&seqnum, &mesh_hdr->seqnum, sizeof(mesh_hdr->seqnum)); |
188 | idx = le32_to_cpu(mesh_hdr->seqnum) & rmc->idx_mask; | |
2e3c8736 LCC |
189 | list_for_each_entry_safe(p, n, &rmc->bucket[idx].list, list) { |
190 | ++entries; | |
191 | if (time_after(jiffies, p->exp_time) || | |
192 | (entries == RMC_QUEUE_MAX_LEN)) { | |
193 | list_del(&p->list); | |
194 | kmem_cache_free(rm_cache, p); | |
195 | --entries; | |
196 | } else if ((seqnum == p->seqnum) | |
197 | && (memcmp(sa, p->sa, ETH_ALEN) == 0)) | |
198 | return -1; | |
199 | } | |
200 | ||
201 | p = kmem_cache_alloc(rm_cache, GFP_ATOMIC); | |
202 | if (!p) { | |
203 | printk(KERN_DEBUG "o11s: could not allocate RMC entry\n"); | |
204 | return 0; | |
205 | } | |
206 | p->seqnum = seqnum; | |
207 | p->exp_time = jiffies + RMC_TIMEOUT; | |
208 | memcpy(p->sa, sa, ETH_ALEN); | |
209 | list_add(&p->list, &rmc->bucket[idx].list); | |
210 | return 0; | |
211 | } | |
212 | ||
f698d856 | 213 | void mesh_mgmt_ies_add(struct sk_buff *skb, struct ieee80211_sub_if_data *sdata) |
2e3c8736 | 214 | { |
f698d856 | 215 | struct ieee80211_local *local = sdata->local; |
2e3c8736 LCC |
216 | struct ieee80211_supported_band *sband; |
217 | u8 *pos; | |
218 | int len, i, rate; | |
219 | ||
220 | sband = local->hw.wiphy->bands[local->hw.conf.channel->band]; | |
221 | len = sband->n_bitrates; | |
222 | if (len > 8) | |
223 | len = 8; | |
224 | pos = skb_put(skb, len + 2); | |
225 | *pos++ = WLAN_EID_SUPP_RATES; | |
226 | *pos++ = len; | |
227 | for (i = 0; i < len; i++) { | |
228 | rate = sband->bitrates[i].bitrate; | |
229 | *pos++ = (u8) (rate / 5); | |
230 | } | |
231 | ||
232 | if (sband->n_bitrates > len) { | |
233 | pos = skb_put(skb, sband->n_bitrates - len + 2); | |
234 | *pos++ = WLAN_EID_EXT_SUPP_RATES; | |
235 | *pos++ = sband->n_bitrates - len; | |
236 | for (i = len; i < sband->n_bitrates; i++) { | |
237 | rate = sband->bitrates[i].bitrate; | |
238 | *pos++ = (u8) (rate / 5); | |
239 | } | |
240 | } | |
241 | ||
472dbc45 | 242 | pos = skb_put(skb, 2 + sdata->u.mesh.mesh_id_len); |
2e3c8736 | 243 | *pos++ = WLAN_EID_MESH_ID; |
472dbc45 JB |
244 | *pos++ = sdata->u.mesh.mesh_id_len; |
245 | if (sdata->u.mesh.mesh_id_len) | |
246 | memcpy(pos, sdata->u.mesh.mesh_id, sdata->u.mesh.mesh_id_len); | |
2e3c8736 LCC |
247 | |
248 | pos = skb_put(skb, 21); | |
249 | *pos++ = WLAN_EID_MESH_CONFIG; | |
1239cd58 | 250 | *pos++ = IEEE80211_MESH_CONFIG_LEN; |
2e3c8736 LCC |
251 | /* Version */ |
252 | *pos++ = 1; | |
253 | ||
254 | /* Active path selection protocol ID */ | |
472dbc45 | 255 | memcpy(pos, sdata->u.mesh.mesh_pp_id, 4); |
2e3c8736 LCC |
256 | pos += 4; |
257 | ||
258 | /* Active path selection metric ID */ | |
472dbc45 | 259 | memcpy(pos, sdata->u.mesh.mesh_pm_id, 4); |
2e3c8736 LCC |
260 | pos += 4; |
261 | ||
262 | /* Congestion control mode identifier */ | |
472dbc45 | 263 | memcpy(pos, sdata->u.mesh.mesh_cc_id, 4); |
2e3c8736 LCC |
264 | pos += 4; |
265 | ||
266 | /* Channel precedence: | |
267 | * Not running simple channel unification protocol | |
268 | */ | |
269 | memset(pos, 0x00, 4); | |
270 | pos += 4; | |
271 | ||
272 | /* Mesh capability */ | |
472dbc45 JB |
273 | sdata->u.mesh.accepting_plinks = mesh_plink_availables(sdata); |
274 | *pos++ = sdata->u.mesh.accepting_plinks ? ACCEPT_PLINKS : 0x00; | |
2e3c8736 LCC |
275 | *pos++ = 0x00; |
276 | ||
277 | return; | |
278 | } | |
279 | ||
f698d856 | 280 | u32 mesh_table_hash(u8 *addr, struct ieee80211_sub_if_data *sdata, struct mesh_table *tbl) |
2e3c8736 LCC |
281 | { |
282 | /* Use last four bytes of hw addr and interface index as hash index */ | |
f698d856 | 283 | return jhash_2words(*(u32 *)(addr+2), sdata->dev->ifindex, tbl->hash_rnd) |
2e3c8736 LCC |
284 | & tbl->hash_mask; |
285 | } | |
286 | ||
2e3c8736 LCC |
287 | struct mesh_table *mesh_table_alloc(int size_order) |
288 | { | |
289 | int i; | |
290 | struct mesh_table *newtbl; | |
291 | ||
292 | newtbl = kmalloc(sizeof(struct mesh_table), GFP_KERNEL); | |
293 | if (!newtbl) | |
294 | return NULL; | |
295 | ||
296 | newtbl->hash_buckets = kzalloc(sizeof(struct hlist_head) * | |
297 | (1 << size_order), GFP_KERNEL); | |
298 | ||
299 | if (!newtbl->hash_buckets) { | |
300 | kfree(newtbl); | |
301 | return NULL; | |
302 | } | |
303 | ||
304 | newtbl->hashwlock = kmalloc(sizeof(spinlock_t) * | |
305 | (1 << size_order), GFP_KERNEL); | |
306 | if (!newtbl->hashwlock) { | |
307 | kfree(newtbl->hash_buckets); | |
308 | kfree(newtbl); | |
309 | return NULL; | |
310 | } | |
311 | ||
312 | newtbl->size_order = size_order; | |
313 | newtbl->hash_mask = (1 << size_order) - 1; | |
314 | atomic_set(&newtbl->entries, 0); | |
315 | get_random_bytes(&newtbl->hash_rnd, | |
316 | sizeof(newtbl->hash_rnd)); | |
317 | for (i = 0; i <= newtbl->hash_mask; i++) | |
318 | spin_lock_init(&newtbl->hashwlock[i]); | |
319 | ||
320 | return newtbl; | |
321 | } | |
322 | ||
bd9b448f PE |
323 | static void __mesh_table_free(struct mesh_table *tbl) |
324 | { | |
325 | kfree(tbl->hash_buckets); | |
326 | kfree(tbl->hashwlock); | |
327 | kfree(tbl); | |
328 | } | |
329 | ||
2e3c8736 LCC |
330 | void mesh_table_free(struct mesh_table *tbl, bool free_leafs) |
331 | { | |
332 | struct hlist_head *mesh_hash; | |
333 | struct hlist_node *p, *q; | |
334 | int i; | |
335 | ||
336 | mesh_hash = tbl->hash_buckets; | |
337 | for (i = 0; i <= tbl->hash_mask; i++) { | |
338 | spin_lock(&tbl->hashwlock[i]); | |
339 | hlist_for_each_safe(p, q, &mesh_hash[i]) { | |
340 | tbl->free_node(p, free_leafs); | |
341 | atomic_dec(&tbl->entries); | |
342 | } | |
343 | spin_unlock(&tbl->hashwlock[i]); | |
344 | } | |
bd9b448f | 345 | __mesh_table_free(tbl); |
2e3c8736 LCC |
346 | } |
347 | ||
348 | static void ieee80211_mesh_path_timer(unsigned long data) | |
349 | { | |
350 | struct ieee80211_sub_if_data *sdata = | |
351 | (struct ieee80211_sub_if_data *) data; | |
472dbc45 | 352 | struct ieee80211_if_mesh *ifmsh = &sdata->u.mesh; |
133b8226 | 353 | struct ieee80211_local *local = sdata->local; |
2e3c8736 | 354 | |
5bb644a0 JB |
355 | if (local->quiescing) { |
356 | set_bit(TMR_RUNNING_MP, &ifmsh->timers_running); | |
357 | return; | |
358 | } | |
359 | ||
472dbc45 | 360 | queue_work(local->hw.workqueue, &ifmsh->work); |
2e3c8736 LCC |
361 | } |
362 | ||
363 | struct mesh_table *mesh_table_grow(struct mesh_table *tbl) | |
364 | { | |
365 | struct mesh_table *newtbl; | |
366 | struct hlist_head *oldhash; | |
4caf86c6 | 367 | struct hlist_node *p, *q; |
2e3c8736 LCC |
368 | int i; |
369 | ||
370 | if (atomic_read(&tbl->entries) | |
a3538b19 | 371 | < tbl->mean_chain_len * (tbl->hash_mask + 1)) |
2e3c8736 | 372 | goto endgrow; |
2e3c8736 LCC |
373 | |
374 | newtbl = mesh_table_alloc(tbl->size_order + 1); | |
a3538b19 | 375 | if (!newtbl) |
2e3c8736 | 376 | goto endgrow; |
2e3c8736 LCC |
377 | |
378 | newtbl->free_node = tbl->free_node; | |
379 | newtbl->mean_chain_len = tbl->mean_chain_len; | |
380 | newtbl->copy_node = tbl->copy_node; | |
381 | atomic_set(&newtbl->entries, atomic_read(&tbl->entries)); | |
382 | ||
383 | oldhash = tbl->hash_buckets; | |
384 | for (i = 0; i <= tbl->hash_mask; i++) | |
385 | hlist_for_each(p, &oldhash[i]) | |
4caf86c6 PE |
386 | if (tbl->copy_node(p, newtbl) < 0) |
387 | goto errcopy; | |
2e3c8736 | 388 | |
a3538b19 | 389 | return newtbl; |
4caf86c6 PE |
390 | |
391 | errcopy: | |
392 | for (i = 0; i <= newtbl->hash_mask; i++) { | |
393 | hlist_for_each_safe(p, q, &newtbl->hash_buckets[i]) | |
394 | tbl->free_node(p, 0); | |
395 | } | |
667d8af9 | 396 | __mesh_table_free(newtbl); |
a3538b19 | 397 | endgrow: |
4caf86c6 | 398 | return NULL; |
2e3c8736 | 399 | } |
902acc78 JB |
400 | |
401 | /** | |
402 | * ieee80211_new_mesh_header - create a new mesh header | |
403 | * @meshhdr: uninitialized mesh header | |
404 | * @sdata: mesh interface to be used | |
405 | * | |
406 | * Return the header length. | |
407 | */ | |
408 | int ieee80211_new_mesh_header(struct ieee80211s_hdr *meshhdr, | |
409 | struct ieee80211_sub_if_data *sdata) | |
410 | { | |
411 | meshhdr->flags = 0; | |
472dbc45 JB |
412 | meshhdr->ttl = sdata->u.mesh.mshcfg.dot11MeshTTL; |
413 | put_unaligned(cpu_to_le32(sdata->u.mesh.mesh_seqnum), &meshhdr->seqnum); | |
414 | sdata->u.mesh.mesh_seqnum++; | |
902acc78 | 415 | |
ef269254 | 416 | return 6; |
902acc78 JB |
417 | } |
418 | ||
472dbc45 JB |
419 | static void ieee80211_mesh_housekeeping(struct ieee80211_sub_if_data *sdata, |
420 | struct ieee80211_if_mesh *ifmsh) | |
421 | { | |
422 | bool free_plinks; | |
423 | ||
424 | #ifdef CONFIG_MAC80211_VERBOSE_DEBUG | |
425 | printk(KERN_DEBUG "%s: running mesh housekeeping\n", | |
426 | sdata->dev->name); | |
427 | #endif | |
428 | ||
429 | ieee80211_sta_expire(sdata, IEEE80211_MESH_PEER_INACTIVITY_LIMIT); | |
430 | mesh_path_expire(sdata); | |
431 | ||
432 | free_plinks = mesh_plink_availables(sdata); | |
433 | if (free_plinks != sdata->u.mesh.accepting_plinks) | |
2d0ddec5 | 434 | ieee80211_bss_info_change_notify(sdata, BSS_CHANGED_BEACON); |
472dbc45 JB |
435 | |
436 | ifmsh->housekeeping = false; | |
437 | mod_timer(&ifmsh->housekeeping_timer, | |
438 | round_jiffies(jiffies + IEEE80211_MESH_HOUSEKEEPING_INTERVAL)); | |
439 | } | |
440 | ||
5bb644a0 JB |
441 | #ifdef CONFIG_PM |
442 | void ieee80211_mesh_quiesce(struct ieee80211_sub_if_data *sdata) | |
443 | { | |
444 | struct ieee80211_if_mesh *ifmsh = &sdata->u.mesh; | |
445 | ||
446 | /* might restart the timer but that doesn't matter */ | |
447 | cancel_work_sync(&ifmsh->work); | |
448 | ||
449 | /* use atomic bitops in case both timers fire at the same time */ | |
450 | ||
451 | if (del_timer_sync(&ifmsh->housekeeping_timer)) | |
452 | set_bit(TMR_RUNNING_HK, &ifmsh->timers_running); | |
453 | if (del_timer_sync(&ifmsh->mesh_path_timer)) | |
454 | set_bit(TMR_RUNNING_MP, &ifmsh->timers_running); | |
455 | } | |
456 | ||
457 | void ieee80211_mesh_restart(struct ieee80211_sub_if_data *sdata) | |
458 | { | |
459 | struct ieee80211_if_mesh *ifmsh = &sdata->u.mesh; | |
460 | ||
461 | if (test_and_clear_bit(TMR_RUNNING_HK, &ifmsh->timers_running)) | |
462 | add_timer(&ifmsh->housekeeping_timer); | |
463 | if (test_and_clear_bit(TMR_RUNNING_MP, &ifmsh->timers_running)) | |
464 | add_timer(&ifmsh->mesh_path_timer); | |
465 | } | |
466 | #endif | |
472dbc45 JB |
467 | |
468 | void ieee80211_start_mesh(struct ieee80211_sub_if_data *sdata) | |
469 | { | |
470 | struct ieee80211_if_mesh *ifmsh = &sdata->u.mesh; | |
471 | struct ieee80211_local *local = sdata->local; | |
472 | ||
473 | ifmsh->housekeeping = true; | |
474 | queue_work(local->hw.workqueue, &ifmsh->work); | |
2d0ddec5 JB |
475 | ieee80211_bss_info_change_notify(sdata, BSS_CHANGED_BEACON | |
476 | BSS_CHANGED_BEACON_ENABLED); | |
472dbc45 JB |
477 | } |
478 | ||
479 | void ieee80211_stop_mesh(struct ieee80211_sub_if_data *sdata) | |
480 | { | |
481 | del_timer_sync(&sdata->u.mesh.housekeeping_timer); | |
b7413430 JB |
482 | /* |
483 | * If the timer fired while we waited for it, it will have | |
484 | * requeued the work. Now the work will be running again | |
485 | * but will not rearm the timer again because it checks | |
486 | * whether the interface is running, which, at this point, | |
487 | * it no longer is. | |
488 | */ | |
489 | cancel_work_sync(&sdata->u.mesh.work); | |
490 | ||
472dbc45 JB |
491 | /* |
492 | * When we get here, the interface is marked down. | |
493 | * Call synchronize_rcu() to wait for the RX path | |
494 | * should it be using the interface and enqueuing | |
495 | * frames at this very time on another CPU. | |
496 | */ | |
4a27096b | 497 | rcu_barrier(); /* Wait for RX path and call_rcu()'s */ |
472dbc45 JB |
498 | skb_queue_purge(&sdata->u.mesh.skb_queue); |
499 | } | |
500 | ||
501 | static void ieee80211_mesh_rx_bcn_presp(struct ieee80211_sub_if_data *sdata, | |
502 | u16 stype, | |
503 | struct ieee80211_mgmt *mgmt, | |
504 | size_t len, | |
505 | struct ieee80211_rx_status *rx_status) | |
506 | { | |
c6a1fa12 | 507 | struct ieee80211_local *local = sdata->local; |
472dbc45 JB |
508 | struct ieee802_11_elems elems; |
509 | struct ieee80211_channel *channel; | |
881d948c | 510 | u32 supp_rates = 0; |
472dbc45 JB |
511 | size_t baselen; |
512 | int freq; | |
513 | enum ieee80211_band band = rx_status->band; | |
514 | ||
515 | /* ignore ProbeResp to foreign address */ | |
516 | if (stype == IEEE80211_STYPE_PROBE_RESP && | |
517 | compare_ether_addr(mgmt->da, sdata->dev->dev_addr)) | |
518 | return; | |
519 | ||
520 | baselen = (u8 *) mgmt->u.probe_resp.variable - (u8 *) mgmt; | |
521 | if (baselen > len) | |
522 | return; | |
523 | ||
524 | ieee802_11_parse_elems(mgmt->u.probe_resp.variable, len - baselen, | |
525 | &elems); | |
526 | ||
527 | if (elems.ds_params && elems.ds_params_len == 1) | |
528 | freq = ieee80211_channel_to_frequency(elems.ds_params[0]); | |
529 | else | |
530 | freq = rx_status->freq; | |
531 | ||
532 | channel = ieee80211_get_channel(local->hw.wiphy, freq); | |
533 | ||
534 | if (!channel || channel->flags & IEEE80211_CHAN_DISABLED) | |
535 | return; | |
536 | ||
537 | if (elems.mesh_id && elems.mesh_config && | |
538 | mesh_matches_local(&elems, sdata)) { | |
539 | supp_rates = ieee80211_sta_get_rates(local, &elems, band); | |
540 | ||
541 | mesh_neighbour_update(mgmt->sa, supp_rates, sdata, | |
542 | mesh_peer_accepts_plinks(&elems)); | |
543 | } | |
544 | } | |
545 | ||
546 | static void ieee80211_mesh_rx_mgmt_action(struct ieee80211_sub_if_data *sdata, | |
547 | struct ieee80211_mgmt *mgmt, | |
548 | size_t len, | |
549 | struct ieee80211_rx_status *rx_status) | |
550 | { | |
551 | switch (mgmt->u.action.category) { | |
552 | case PLINK_CATEGORY: | |
553 | mesh_rx_plink_frame(sdata, mgmt, len, rx_status); | |
554 | break; | |
555 | case MESH_PATH_SEL_CATEGORY: | |
556 | mesh_rx_path_sel_frame(sdata, mgmt, len); | |
557 | break; | |
558 | } | |
559 | } | |
560 | ||
561 | static void ieee80211_mesh_rx_queued_mgmt(struct ieee80211_sub_if_data *sdata, | |
562 | struct sk_buff *skb) | |
563 | { | |
564 | struct ieee80211_rx_status *rx_status; | |
565 | struct ieee80211_if_mesh *ifmsh; | |
566 | struct ieee80211_mgmt *mgmt; | |
567 | u16 stype; | |
568 | ||
569 | ifmsh = &sdata->u.mesh; | |
570 | ||
f1d58c25 | 571 | rx_status = IEEE80211_SKB_RXCB(skb); |
472dbc45 JB |
572 | mgmt = (struct ieee80211_mgmt *) skb->data; |
573 | stype = le16_to_cpu(mgmt->frame_control) & IEEE80211_FCTL_STYPE; | |
574 | ||
575 | switch (stype) { | |
576 | case IEEE80211_STYPE_PROBE_RESP: | |
577 | case IEEE80211_STYPE_BEACON: | |
578 | ieee80211_mesh_rx_bcn_presp(sdata, stype, mgmt, skb->len, | |
579 | rx_status); | |
580 | break; | |
581 | case IEEE80211_STYPE_ACTION: | |
582 | ieee80211_mesh_rx_mgmt_action(sdata, mgmt, skb->len, rx_status); | |
583 | break; | |
584 | } | |
585 | ||
586 | kfree_skb(skb); | |
587 | } | |
588 | ||
589 | static void ieee80211_mesh_work(struct work_struct *work) | |
590 | { | |
591 | struct ieee80211_sub_if_data *sdata = | |
592 | container_of(work, struct ieee80211_sub_if_data, u.mesh.work); | |
593 | struct ieee80211_local *local = sdata->local; | |
594 | struct ieee80211_if_mesh *ifmsh = &sdata->u.mesh; | |
595 | struct sk_buff *skb; | |
596 | ||
597 | if (!netif_running(sdata->dev)) | |
598 | return; | |
599 | ||
c2b13452 | 600 | if (local->sw_scanning || local->hw_scanning) |
472dbc45 JB |
601 | return; |
602 | ||
603 | while ((skb = skb_dequeue(&ifmsh->skb_queue))) | |
604 | ieee80211_mesh_rx_queued_mgmt(sdata, skb); | |
605 | ||
606 | if (ifmsh->preq_queue_len && | |
607 | time_after(jiffies, | |
608 | ifmsh->last_preq + msecs_to_jiffies(ifmsh->mshcfg.dot11MeshHWMPpreqMinInterval))) | |
609 | mesh_path_start_discovery(sdata); | |
610 | ||
611 | if (ifmsh->housekeeping) | |
612 | ieee80211_mesh_housekeeping(sdata, ifmsh); | |
613 | } | |
614 | ||
615 | void ieee80211_mesh_notify_scan_completed(struct ieee80211_local *local) | |
616 | { | |
617 | struct ieee80211_sub_if_data *sdata; | |
618 | ||
619 | rcu_read_lock(); | |
620 | list_for_each_entry_rcu(sdata, &local->interfaces, list) | |
621 | if (ieee80211_vif_is_mesh(&sdata->vif)) | |
622 | queue_work(local->hw.workqueue, &sdata->u.mesh.work); | |
623 | rcu_read_unlock(); | |
624 | } | |
625 | ||
902acc78 JB |
626 | void ieee80211_mesh_init_sdata(struct ieee80211_sub_if_data *sdata) |
627 | { | |
472dbc45 JB |
628 | struct ieee80211_if_mesh *ifmsh = &sdata->u.mesh; |
629 | ||
630 | INIT_WORK(&ifmsh->work, ieee80211_mesh_work); | |
631 | setup_timer(&ifmsh->housekeeping_timer, | |
632 | ieee80211_mesh_housekeeping_timer, | |
633 | (unsigned long) sdata); | |
634 | skb_queue_head_init(&sdata->u.mesh.skb_queue); | |
635 | ||
636 | ifmsh->mshcfg.dot11MeshRetryTimeout = MESH_RET_T; | |
637 | ifmsh->mshcfg.dot11MeshConfirmTimeout = MESH_CONF_T; | |
638 | ifmsh->mshcfg.dot11MeshHoldingTimeout = MESH_HOLD_T; | |
639 | ifmsh->mshcfg.dot11MeshMaxRetries = MESH_MAX_RETR; | |
640 | ifmsh->mshcfg.dot11MeshTTL = MESH_TTL; | |
641 | ifmsh->mshcfg.auto_open_plinks = true; | |
642 | ifmsh->mshcfg.dot11MeshMaxPeerLinks = | |
902acc78 | 643 | MESH_MAX_ESTAB_PLINKS; |
472dbc45 | 644 | ifmsh->mshcfg.dot11MeshHWMPactivePathTimeout = |
902acc78 | 645 | MESH_PATH_TIMEOUT; |
472dbc45 | 646 | ifmsh->mshcfg.dot11MeshHWMPpreqMinInterval = |
902acc78 | 647 | MESH_PREQ_MIN_INT; |
472dbc45 | 648 | ifmsh->mshcfg.dot11MeshHWMPnetDiameterTraversalTime = |
902acc78 | 649 | MESH_DIAM_TRAVERSAL_TIME; |
472dbc45 | 650 | ifmsh->mshcfg.dot11MeshHWMPmaxPREQretries = |
902acc78 | 651 | MESH_MAX_PREQ_RETRIES; |
472dbc45 | 652 | ifmsh->mshcfg.path_refresh_time = |
902acc78 | 653 | MESH_PATH_REFRESH_TIME; |
472dbc45 | 654 | ifmsh->mshcfg.min_discovery_timeout = |
902acc78 | 655 | MESH_MIN_DISCOVERY_TIMEOUT; |
472dbc45 JB |
656 | ifmsh->accepting_plinks = true; |
657 | ifmsh->preq_id = 0; | |
658 | ifmsh->dsn = 0; | |
659 | atomic_set(&ifmsh->mpaths, 0); | |
f698d856 | 660 | mesh_rmc_init(sdata); |
472dbc45 | 661 | ifmsh->last_preq = jiffies; |
902acc78 JB |
662 | /* Allocate all mesh structures when creating the first mesh interface. */ |
663 | if (!mesh_allocated) | |
664 | ieee80211s_init(); | |
472dbc45 JB |
665 | mesh_ids_set_default(ifmsh); |
666 | setup_timer(&ifmsh->mesh_path_timer, | |
902acc78 JB |
667 | ieee80211_mesh_path_timer, |
668 | (unsigned long) sdata); | |
472dbc45 JB |
669 | INIT_LIST_HEAD(&ifmsh->preq_queue.list); |
670 | spin_lock_init(&ifmsh->mesh_preq_queue_lock); | |
671 | } | |
672 | ||
673 | ieee80211_rx_result | |
f1d58c25 | 674 | ieee80211_mesh_rx_mgmt(struct ieee80211_sub_if_data *sdata, struct sk_buff *skb) |
472dbc45 JB |
675 | { |
676 | struct ieee80211_local *local = sdata->local; | |
677 | struct ieee80211_if_mesh *ifmsh = &sdata->u.mesh; | |
678 | struct ieee80211_mgmt *mgmt; | |
679 | u16 fc; | |
680 | ||
681 | if (skb->len < 24) | |
682 | return RX_DROP_MONITOR; | |
683 | ||
684 | mgmt = (struct ieee80211_mgmt *) skb->data; | |
685 | fc = le16_to_cpu(mgmt->frame_control); | |
686 | ||
687 | switch (fc & IEEE80211_FCTL_STYPE) { | |
688 | case IEEE80211_STYPE_PROBE_RESP: | |
689 | case IEEE80211_STYPE_BEACON: | |
690 | case IEEE80211_STYPE_ACTION: | |
472dbc45 JB |
691 | skb_queue_tail(&ifmsh->skb_queue, skb); |
692 | queue_work(local->hw.workqueue, &ifmsh->work); | |
693 | return RX_QUEUED; | |
694 | } | |
695 | ||
696 | return RX_CONTINUE; | |
902acc78 | 697 | } |