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 | ||
24 | int mesh_allocated; | |
25 | static struct kmem_cache *rm_cache; | |
26 | ||
27 | void ieee80211s_init(void) | |
28 | { | |
29 | mesh_pathtbl_init(); | |
30 | mesh_allocated = 1; | |
31 | rm_cache = kmem_cache_create("mesh_rmc", sizeof(struct rmc_entry), | |
32 | 0, 0, NULL); | |
33 | } | |
34 | ||
35 | void ieee80211s_stop(void) | |
36 | { | |
37 | mesh_pathtbl_unregister(); | |
38 | kmem_cache_destroy(rm_cache); | |
39 | } | |
40 | ||
472dbc45 JB |
41 | static void ieee80211_mesh_housekeeping_timer(unsigned long data) |
42 | { | |
43 | struct ieee80211_sub_if_data *sdata = (void *) data; | |
44 | struct ieee80211_local *local = sdata->local; | |
45 | struct ieee80211_if_mesh *ifmsh = &sdata->u.mesh; | |
46 | ||
47 | ifmsh->housekeeping = true; | |
48 | queue_work(local->hw.workqueue, &ifmsh->work); | |
49 | } | |
50 | ||
2e3c8736 LCC |
51 | /** |
52 | * mesh_matches_local - check if the config of a mesh point matches ours | |
53 | * | |
54 | * @ie: information elements of a management frame from the mesh peer | |
f698d856 | 55 | * @sdata: local mesh subif |
2e3c8736 LCC |
56 | * |
57 | * This function checks if the mesh configuration of a mesh point matches the | |
58 | * local mesh configuration, i.e. if both nodes belong to the same mesh network. | |
59 | */ | |
f698d856 | 60 | bool mesh_matches_local(struct ieee802_11_elems *ie, struct ieee80211_sub_if_data *sdata) |
2e3c8736 | 61 | { |
472dbc45 | 62 | struct ieee80211_if_mesh *ifmsh = &sdata->u.mesh; |
2e3c8736 | 63 | |
2e3c8736 LCC |
64 | /* |
65 | * As support for each feature is added, check for matching | |
66 | * - On mesh config capabilities | |
67 | * - Power Save Support En | |
68 | * - Sync support enabled | |
69 | * - Sync support active | |
70 | * - Sync support required from peer | |
71 | * - MDA enabled | |
72 | * - Power management control on fc | |
73 | */ | |
472dbc45 JB |
74 | if (ifmsh->mesh_id_len == ie->mesh_id_len && |
75 | memcmp(ifmsh->mesh_id, ie->mesh_id, ie->mesh_id_len) == 0 && | |
76 | memcmp(ifmsh->mesh_pp_id, ie->mesh_config + PP_OFFSET, 4) == 0 && | |
77 | memcmp(ifmsh->mesh_pm_id, ie->mesh_config + PM_OFFSET, 4) == 0 && | |
78 | memcmp(ifmsh->mesh_cc_id, ie->mesh_config + CC_OFFSET, 4) == 0) | |
2e3c8736 LCC |
79 | return true; |
80 | ||
81 | return false; | |
82 | } | |
83 | ||
84 | /** | |
85 | * mesh_peer_accepts_plinks - check if an mp is willing to establish peer links | |
86 | * | |
87 | * @ie: information elements of a management frame from the mesh peer | |
2e3c8736 | 88 | */ |
f698d856 | 89 | bool mesh_peer_accepts_plinks(struct ieee802_11_elems *ie) |
2e3c8736 LCC |
90 | { |
91 | return (*(ie->mesh_config + CAPAB_OFFSET) & ACCEPT_PLINKS) != 0; | |
92 | } | |
93 | ||
94 | /** | |
95 | * mesh_accept_plinks_update: update accepting_plink in local mesh beacons | |
96 | * | |
d0709a65 | 97 | * @sdata: mesh interface in which mesh beacons are going to be updated |
2e3c8736 | 98 | */ |
d0709a65 | 99 | void mesh_accept_plinks_update(struct ieee80211_sub_if_data *sdata) |
2e3c8736 | 100 | { |
2e3c8736 LCC |
101 | bool free_plinks; |
102 | ||
103 | /* In case mesh_plink_free_count > 0 and mesh_plinktbl_capacity == 0, | |
104 | * the mesh interface might be able to establish plinks with peers that | |
b4e08ea1 LCC |
105 | * are already on the table but are not on PLINK_ESTAB state. However, |
106 | * in general the mesh interface is not accepting peer link requests | |
107 | * from new peers, and that must be reflected in the beacon | |
2e3c8736 LCC |
108 | */ |
109 | free_plinks = mesh_plink_availables(sdata); | |
110 | ||
472dbc45 JB |
111 | if (free_plinks != sdata->u.mesh.accepting_plinks) |
112 | ieee80211_mesh_housekeeping_timer((unsigned long) sdata); | |
2e3c8736 LCC |
113 | } |
114 | ||
472dbc45 | 115 | void mesh_ids_set_default(struct ieee80211_if_mesh *sta) |
2e3c8736 LCC |
116 | { |
117 | u8 def_id[4] = {0x00, 0x0F, 0xAC, 0xff}; | |
118 | ||
119 | memcpy(sta->mesh_pp_id, def_id, 4); | |
120 | memcpy(sta->mesh_pm_id, def_id, 4); | |
121 | memcpy(sta->mesh_cc_id, def_id, 4); | |
122 | } | |
123 | ||
f698d856 | 124 | int mesh_rmc_init(struct ieee80211_sub_if_data *sdata) |
2e3c8736 | 125 | { |
2e3c8736 LCC |
126 | int i; |
127 | ||
472dbc45 JB |
128 | sdata->u.mesh.rmc = kmalloc(sizeof(struct mesh_rmc), GFP_KERNEL); |
129 | if (!sdata->u.mesh.rmc) | |
2e3c8736 | 130 | return -ENOMEM; |
472dbc45 | 131 | sdata->u.mesh.rmc->idx_mask = RMC_BUCKETS - 1; |
2e3c8736 | 132 | for (i = 0; i < RMC_BUCKETS; i++) |
472dbc45 | 133 | INIT_LIST_HEAD(&sdata->u.mesh.rmc->bucket[i].list); |
2e3c8736 LCC |
134 | return 0; |
135 | } | |
136 | ||
f698d856 | 137 | void mesh_rmc_free(struct ieee80211_sub_if_data *sdata) |
2e3c8736 | 138 | { |
472dbc45 | 139 | struct mesh_rmc *rmc = sdata->u.mesh.rmc; |
2e3c8736 LCC |
140 | struct rmc_entry *p, *n; |
141 | int i; | |
142 | ||
472dbc45 | 143 | if (!sdata->u.mesh.rmc) |
2e3c8736 LCC |
144 | return; |
145 | ||
146 | for (i = 0; i < RMC_BUCKETS; i++) | |
147 | list_for_each_entry_safe(p, n, &rmc->bucket[i].list, list) { | |
148 | list_del(&p->list); | |
149 | kmem_cache_free(rm_cache, p); | |
150 | } | |
151 | ||
152 | kfree(rmc); | |
472dbc45 | 153 | sdata->u.mesh.rmc = NULL; |
2e3c8736 LCC |
154 | } |
155 | ||
156 | /** | |
157 | * mesh_rmc_check - Check frame in recent multicast cache and add if absent. | |
158 | * | |
159 | * @sa: source address | |
160 | * @mesh_hdr: mesh_header | |
161 | * | |
162 | * Returns: 0 if the frame is not in the cache, nonzero otherwise. | |
163 | * | |
164 | * Checks using the source address and the mesh sequence number if we have | |
165 | * received this frame lately. If the frame is not in the cache, it is added to | |
166 | * it. | |
167 | */ | |
168 | int mesh_rmc_check(u8 *sa, struct ieee80211s_hdr *mesh_hdr, | |
f698d856 | 169 | struct ieee80211_sub_if_data *sdata) |
2e3c8736 | 170 | { |
472dbc45 | 171 | struct mesh_rmc *rmc = sdata->u.mesh.rmc; |
2e3c8736 LCC |
172 | u32 seqnum = 0; |
173 | int entries = 0; | |
174 | u8 idx; | |
175 | struct rmc_entry *p, *n; | |
176 | ||
177 | /* Don't care about endianness since only match matters */ | |
51ceddad LCC |
178 | memcpy(&seqnum, &mesh_hdr->seqnum, sizeof(mesh_hdr->seqnum)); |
179 | idx = le32_to_cpu(mesh_hdr->seqnum) & rmc->idx_mask; | |
2e3c8736 LCC |
180 | list_for_each_entry_safe(p, n, &rmc->bucket[idx].list, list) { |
181 | ++entries; | |
182 | if (time_after(jiffies, p->exp_time) || | |
183 | (entries == RMC_QUEUE_MAX_LEN)) { | |
184 | list_del(&p->list); | |
185 | kmem_cache_free(rm_cache, p); | |
186 | --entries; | |
187 | } else if ((seqnum == p->seqnum) | |
188 | && (memcmp(sa, p->sa, ETH_ALEN) == 0)) | |
189 | return -1; | |
190 | } | |
191 | ||
192 | p = kmem_cache_alloc(rm_cache, GFP_ATOMIC); | |
193 | if (!p) { | |
194 | printk(KERN_DEBUG "o11s: could not allocate RMC entry\n"); | |
195 | return 0; | |
196 | } | |
197 | p->seqnum = seqnum; | |
198 | p->exp_time = jiffies + RMC_TIMEOUT; | |
199 | memcpy(p->sa, sa, ETH_ALEN); | |
200 | list_add(&p->list, &rmc->bucket[idx].list); | |
201 | return 0; | |
202 | } | |
203 | ||
f698d856 | 204 | void mesh_mgmt_ies_add(struct sk_buff *skb, struct ieee80211_sub_if_data *sdata) |
2e3c8736 | 205 | { |
f698d856 | 206 | struct ieee80211_local *local = sdata->local; |
2e3c8736 LCC |
207 | struct ieee80211_supported_band *sband; |
208 | u8 *pos; | |
209 | int len, i, rate; | |
210 | ||
211 | sband = local->hw.wiphy->bands[local->hw.conf.channel->band]; | |
212 | len = sband->n_bitrates; | |
213 | if (len > 8) | |
214 | len = 8; | |
215 | pos = skb_put(skb, len + 2); | |
216 | *pos++ = WLAN_EID_SUPP_RATES; | |
217 | *pos++ = len; | |
218 | for (i = 0; i < len; i++) { | |
219 | rate = sband->bitrates[i].bitrate; | |
220 | *pos++ = (u8) (rate / 5); | |
221 | } | |
222 | ||
223 | if (sband->n_bitrates > len) { | |
224 | pos = skb_put(skb, sband->n_bitrates - len + 2); | |
225 | *pos++ = WLAN_EID_EXT_SUPP_RATES; | |
226 | *pos++ = sband->n_bitrates - len; | |
227 | for (i = len; i < sband->n_bitrates; i++) { | |
228 | rate = sband->bitrates[i].bitrate; | |
229 | *pos++ = (u8) (rate / 5); | |
230 | } | |
231 | } | |
232 | ||
472dbc45 | 233 | pos = skb_put(skb, 2 + sdata->u.mesh.mesh_id_len); |
2e3c8736 | 234 | *pos++ = WLAN_EID_MESH_ID; |
472dbc45 JB |
235 | *pos++ = sdata->u.mesh.mesh_id_len; |
236 | if (sdata->u.mesh.mesh_id_len) | |
237 | memcpy(pos, sdata->u.mesh.mesh_id, sdata->u.mesh.mesh_id_len); | |
2e3c8736 LCC |
238 | |
239 | pos = skb_put(skb, 21); | |
240 | *pos++ = WLAN_EID_MESH_CONFIG; | |
1239cd58 | 241 | *pos++ = IEEE80211_MESH_CONFIG_LEN; |
2e3c8736 LCC |
242 | /* Version */ |
243 | *pos++ = 1; | |
244 | ||
245 | /* Active path selection protocol ID */ | |
472dbc45 | 246 | memcpy(pos, sdata->u.mesh.mesh_pp_id, 4); |
2e3c8736 LCC |
247 | pos += 4; |
248 | ||
249 | /* Active path selection metric ID */ | |
472dbc45 | 250 | memcpy(pos, sdata->u.mesh.mesh_pm_id, 4); |
2e3c8736 LCC |
251 | pos += 4; |
252 | ||
253 | /* Congestion control mode identifier */ | |
472dbc45 | 254 | memcpy(pos, sdata->u.mesh.mesh_cc_id, 4); |
2e3c8736 LCC |
255 | pos += 4; |
256 | ||
257 | /* Channel precedence: | |
258 | * Not running simple channel unification protocol | |
259 | */ | |
260 | memset(pos, 0x00, 4); | |
261 | pos += 4; | |
262 | ||
263 | /* Mesh capability */ | |
472dbc45 JB |
264 | sdata->u.mesh.accepting_plinks = mesh_plink_availables(sdata); |
265 | *pos++ = sdata->u.mesh.accepting_plinks ? ACCEPT_PLINKS : 0x00; | |
2e3c8736 LCC |
266 | *pos++ = 0x00; |
267 | ||
268 | return; | |
269 | } | |
270 | ||
f698d856 | 271 | u32 mesh_table_hash(u8 *addr, struct ieee80211_sub_if_data *sdata, struct mesh_table *tbl) |
2e3c8736 LCC |
272 | { |
273 | /* Use last four bytes of hw addr and interface index as hash index */ | |
f698d856 | 274 | return jhash_2words(*(u32 *)(addr+2), sdata->dev->ifindex, tbl->hash_rnd) |
2e3c8736 LCC |
275 | & tbl->hash_mask; |
276 | } | |
277 | ||
2e3c8736 LCC |
278 | struct mesh_table *mesh_table_alloc(int size_order) |
279 | { | |
280 | int i; | |
281 | struct mesh_table *newtbl; | |
282 | ||
283 | newtbl = kmalloc(sizeof(struct mesh_table), GFP_KERNEL); | |
284 | if (!newtbl) | |
285 | return NULL; | |
286 | ||
287 | newtbl->hash_buckets = kzalloc(sizeof(struct hlist_head) * | |
288 | (1 << size_order), GFP_KERNEL); | |
289 | ||
290 | if (!newtbl->hash_buckets) { | |
291 | kfree(newtbl); | |
292 | return NULL; | |
293 | } | |
294 | ||
295 | newtbl->hashwlock = kmalloc(sizeof(spinlock_t) * | |
296 | (1 << size_order), GFP_KERNEL); | |
297 | if (!newtbl->hashwlock) { | |
298 | kfree(newtbl->hash_buckets); | |
299 | kfree(newtbl); | |
300 | return NULL; | |
301 | } | |
302 | ||
303 | newtbl->size_order = size_order; | |
304 | newtbl->hash_mask = (1 << size_order) - 1; | |
305 | atomic_set(&newtbl->entries, 0); | |
306 | get_random_bytes(&newtbl->hash_rnd, | |
307 | sizeof(newtbl->hash_rnd)); | |
308 | for (i = 0; i <= newtbl->hash_mask; i++) | |
309 | spin_lock_init(&newtbl->hashwlock[i]); | |
310 | ||
311 | return newtbl; | |
312 | } | |
313 | ||
bd9b448f PE |
314 | static void __mesh_table_free(struct mesh_table *tbl) |
315 | { | |
316 | kfree(tbl->hash_buckets); | |
317 | kfree(tbl->hashwlock); | |
318 | kfree(tbl); | |
319 | } | |
320 | ||
2e3c8736 LCC |
321 | void mesh_table_free(struct mesh_table *tbl, bool free_leafs) |
322 | { | |
323 | struct hlist_head *mesh_hash; | |
324 | struct hlist_node *p, *q; | |
325 | int i; | |
326 | ||
327 | mesh_hash = tbl->hash_buckets; | |
328 | for (i = 0; i <= tbl->hash_mask; i++) { | |
329 | spin_lock(&tbl->hashwlock[i]); | |
330 | hlist_for_each_safe(p, q, &mesh_hash[i]) { | |
331 | tbl->free_node(p, free_leafs); | |
332 | atomic_dec(&tbl->entries); | |
333 | } | |
334 | spin_unlock(&tbl->hashwlock[i]); | |
335 | } | |
bd9b448f | 336 | __mesh_table_free(tbl); |
2e3c8736 LCC |
337 | } |
338 | ||
339 | static void ieee80211_mesh_path_timer(unsigned long data) | |
340 | { | |
341 | struct ieee80211_sub_if_data *sdata = | |
342 | (struct ieee80211_sub_if_data *) data; | |
472dbc45 | 343 | struct ieee80211_if_mesh *ifmsh = &sdata->u.mesh; |
133b8226 | 344 | struct ieee80211_local *local = sdata->local; |
2e3c8736 | 345 | |
472dbc45 | 346 | queue_work(local->hw.workqueue, &ifmsh->work); |
2e3c8736 LCC |
347 | } |
348 | ||
349 | struct mesh_table *mesh_table_grow(struct mesh_table *tbl) | |
350 | { | |
351 | struct mesh_table *newtbl; | |
352 | struct hlist_head *oldhash; | |
4caf86c6 | 353 | struct hlist_node *p, *q; |
2e3c8736 LCC |
354 | int i; |
355 | ||
356 | if (atomic_read(&tbl->entries) | |
a3538b19 | 357 | < tbl->mean_chain_len * (tbl->hash_mask + 1)) |
2e3c8736 | 358 | goto endgrow; |
2e3c8736 LCC |
359 | |
360 | newtbl = mesh_table_alloc(tbl->size_order + 1); | |
a3538b19 | 361 | if (!newtbl) |
2e3c8736 | 362 | goto endgrow; |
2e3c8736 LCC |
363 | |
364 | newtbl->free_node = tbl->free_node; | |
365 | newtbl->mean_chain_len = tbl->mean_chain_len; | |
366 | newtbl->copy_node = tbl->copy_node; | |
367 | atomic_set(&newtbl->entries, atomic_read(&tbl->entries)); | |
368 | ||
369 | oldhash = tbl->hash_buckets; | |
370 | for (i = 0; i <= tbl->hash_mask; i++) | |
371 | hlist_for_each(p, &oldhash[i]) | |
4caf86c6 PE |
372 | if (tbl->copy_node(p, newtbl) < 0) |
373 | goto errcopy; | |
2e3c8736 | 374 | |
a3538b19 | 375 | return newtbl; |
4caf86c6 PE |
376 | |
377 | errcopy: | |
378 | for (i = 0; i <= newtbl->hash_mask; i++) { | |
379 | hlist_for_each_safe(p, q, &newtbl->hash_buckets[i]) | |
380 | tbl->free_node(p, 0); | |
381 | } | |
667d8af9 | 382 | __mesh_table_free(newtbl); |
a3538b19 | 383 | endgrow: |
4caf86c6 | 384 | return NULL; |
2e3c8736 | 385 | } |
902acc78 JB |
386 | |
387 | /** | |
388 | * ieee80211_new_mesh_header - create a new mesh header | |
389 | * @meshhdr: uninitialized mesh header | |
390 | * @sdata: mesh interface to be used | |
391 | * | |
392 | * Return the header length. | |
393 | */ | |
394 | int ieee80211_new_mesh_header(struct ieee80211s_hdr *meshhdr, | |
395 | struct ieee80211_sub_if_data *sdata) | |
396 | { | |
397 | meshhdr->flags = 0; | |
472dbc45 JB |
398 | meshhdr->ttl = sdata->u.mesh.mshcfg.dot11MeshTTL; |
399 | put_unaligned(cpu_to_le32(sdata->u.mesh.mesh_seqnum), &meshhdr->seqnum); | |
400 | sdata->u.mesh.mesh_seqnum++; | |
902acc78 | 401 | |
ef269254 | 402 | return 6; |
902acc78 JB |
403 | } |
404 | ||
472dbc45 JB |
405 | static void ieee80211_mesh_housekeeping(struct ieee80211_sub_if_data *sdata, |
406 | struct ieee80211_if_mesh *ifmsh) | |
407 | { | |
408 | bool free_plinks; | |
409 | ||
410 | #ifdef CONFIG_MAC80211_VERBOSE_DEBUG | |
411 | printk(KERN_DEBUG "%s: running mesh housekeeping\n", | |
412 | sdata->dev->name); | |
413 | #endif | |
414 | ||
415 | ieee80211_sta_expire(sdata, IEEE80211_MESH_PEER_INACTIVITY_LIMIT); | |
416 | mesh_path_expire(sdata); | |
417 | ||
418 | free_plinks = mesh_plink_availables(sdata); | |
419 | if (free_plinks != sdata->u.mesh.accepting_plinks) | |
420 | ieee80211_if_config(sdata, IEEE80211_IFCC_BEACON); | |
421 | ||
422 | ifmsh->housekeeping = false; | |
423 | mod_timer(&ifmsh->housekeeping_timer, | |
424 | round_jiffies(jiffies + IEEE80211_MESH_HOUSEKEEPING_INTERVAL)); | |
425 | } | |
426 | ||
427 | ||
428 | void ieee80211_start_mesh(struct ieee80211_sub_if_data *sdata) | |
429 | { | |
430 | struct ieee80211_if_mesh *ifmsh = &sdata->u.mesh; | |
431 | struct ieee80211_local *local = sdata->local; | |
432 | ||
433 | ifmsh->housekeeping = true; | |
434 | queue_work(local->hw.workqueue, &ifmsh->work); | |
078e1e60 JB |
435 | ieee80211_if_config(sdata, IEEE80211_IFCC_BEACON | |
436 | IEEE80211_IFCC_BEACON_ENABLED); | |
472dbc45 JB |
437 | } |
438 | ||
439 | void ieee80211_stop_mesh(struct ieee80211_sub_if_data *sdata) | |
440 | { | |
441 | del_timer_sync(&sdata->u.mesh.housekeeping_timer); | |
b7413430 JB |
442 | /* |
443 | * If the timer fired while we waited for it, it will have | |
444 | * requeued the work. Now the work will be running again | |
445 | * but will not rearm the timer again because it checks | |
446 | * whether the interface is running, which, at this point, | |
447 | * it no longer is. | |
448 | */ | |
449 | cancel_work_sync(&sdata->u.mesh.work); | |
450 | ||
472dbc45 JB |
451 | /* |
452 | * When we get here, the interface is marked down. | |
453 | * Call synchronize_rcu() to wait for the RX path | |
454 | * should it be using the interface and enqueuing | |
455 | * frames at this very time on another CPU. | |
456 | */ | |
457 | synchronize_rcu(); | |
458 | skb_queue_purge(&sdata->u.mesh.skb_queue); | |
459 | } | |
460 | ||
461 | static void ieee80211_mesh_rx_bcn_presp(struct ieee80211_sub_if_data *sdata, | |
462 | u16 stype, | |
463 | struct ieee80211_mgmt *mgmt, | |
464 | size_t len, | |
465 | struct ieee80211_rx_status *rx_status) | |
466 | { | |
c6a1fa12 | 467 | struct ieee80211_local *local = sdata->local; |
472dbc45 JB |
468 | struct ieee802_11_elems elems; |
469 | struct ieee80211_channel *channel; | |
881d948c | 470 | u32 supp_rates = 0; |
472dbc45 JB |
471 | size_t baselen; |
472 | int freq; | |
473 | enum ieee80211_band band = rx_status->band; | |
474 | ||
475 | /* ignore ProbeResp to foreign address */ | |
476 | if (stype == IEEE80211_STYPE_PROBE_RESP && | |
477 | compare_ether_addr(mgmt->da, sdata->dev->dev_addr)) | |
478 | return; | |
479 | ||
480 | baselen = (u8 *) mgmt->u.probe_resp.variable - (u8 *) mgmt; | |
481 | if (baselen > len) | |
482 | return; | |
483 | ||
484 | ieee802_11_parse_elems(mgmt->u.probe_resp.variable, len - baselen, | |
485 | &elems); | |
486 | ||
487 | if (elems.ds_params && elems.ds_params_len == 1) | |
488 | freq = ieee80211_channel_to_frequency(elems.ds_params[0]); | |
489 | else | |
490 | freq = rx_status->freq; | |
491 | ||
492 | channel = ieee80211_get_channel(local->hw.wiphy, freq); | |
493 | ||
494 | if (!channel || channel->flags & IEEE80211_CHAN_DISABLED) | |
495 | return; | |
496 | ||
497 | if (elems.mesh_id && elems.mesh_config && | |
498 | mesh_matches_local(&elems, sdata)) { | |
499 | supp_rates = ieee80211_sta_get_rates(local, &elems, band); | |
500 | ||
501 | mesh_neighbour_update(mgmt->sa, supp_rates, sdata, | |
502 | mesh_peer_accepts_plinks(&elems)); | |
503 | } | |
504 | } | |
505 | ||
506 | static void ieee80211_mesh_rx_mgmt_action(struct ieee80211_sub_if_data *sdata, | |
507 | struct ieee80211_mgmt *mgmt, | |
508 | size_t len, | |
509 | struct ieee80211_rx_status *rx_status) | |
510 | { | |
511 | switch (mgmt->u.action.category) { | |
512 | case PLINK_CATEGORY: | |
513 | mesh_rx_plink_frame(sdata, mgmt, len, rx_status); | |
514 | break; | |
515 | case MESH_PATH_SEL_CATEGORY: | |
516 | mesh_rx_path_sel_frame(sdata, mgmt, len); | |
517 | break; | |
518 | } | |
519 | } | |
520 | ||
521 | static void ieee80211_mesh_rx_queued_mgmt(struct ieee80211_sub_if_data *sdata, | |
522 | struct sk_buff *skb) | |
523 | { | |
524 | struct ieee80211_rx_status *rx_status; | |
525 | struct ieee80211_if_mesh *ifmsh; | |
526 | struct ieee80211_mgmt *mgmt; | |
527 | u16 stype; | |
528 | ||
529 | ifmsh = &sdata->u.mesh; | |
530 | ||
531 | rx_status = (struct ieee80211_rx_status *) skb->cb; | |
532 | mgmt = (struct ieee80211_mgmt *) skb->data; | |
533 | stype = le16_to_cpu(mgmt->frame_control) & IEEE80211_FCTL_STYPE; | |
534 | ||
535 | switch (stype) { | |
536 | case IEEE80211_STYPE_PROBE_RESP: | |
537 | case IEEE80211_STYPE_BEACON: | |
538 | ieee80211_mesh_rx_bcn_presp(sdata, stype, mgmt, skb->len, | |
539 | rx_status); | |
540 | break; | |
541 | case IEEE80211_STYPE_ACTION: | |
542 | ieee80211_mesh_rx_mgmt_action(sdata, mgmt, skb->len, rx_status); | |
543 | break; | |
544 | } | |
545 | ||
546 | kfree_skb(skb); | |
547 | } | |
548 | ||
549 | static void ieee80211_mesh_work(struct work_struct *work) | |
550 | { | |
551 | struct ieee80211_sub_if_data *sdata = | |
552 | container_of(work, struct ieee80211_sub_if_data, u.mesh.work); | |
553 | struct ieee80211_local *local = sdata->local; | |
554 | struct ieee80211_if_mesh *ifmsh = &sdata->u.mesh; | |
555 | struct sk_buff *skb; | |
556 | ||
557 | if (!netif_running(sdata->dev)) | |
558 | return; | |
559 | ||
c2b13452 | 560 | if (local->sw_scanning || local->hw_scanning) |
472dbc45 JB |
561 | return; |
562 | ||
563 | while ((skb = skb_dequeue(&ifmsh->skb_queue))) | |
564 | ieee80211_mesh_rx_queued_mgmt(sdata, skb); | |
565 | ||
566 | if (ifmsh->preq_queue_len && | |
567 | time_after(jiffies, | |
568 | ifmsh->last_preq + msecs_to_jiffies(ifmsh->mshcfg.dot11MeshHWMPpreqMinInterval))) | |
569 | mesh_path_start_discovery(sdata); | |
570 | ||
571 | if (ifmsh->housekeeping) | |
572 | ieee80211_mesh_housekeeping(sdata, ifmsh); | |
573 | } | |
574 | ||
575 | void ieee80211_mesh_notify_scan_completed(struct ieee80211_local *local) | |
576 | { | |
577 | struct ieee80211_sub_if_data *sdata; | |
578 | ||
579 | rcu_read_lock(); | |
580 | list_for_each_entry_rcu(sdata, &local->interfaces, list) | |
581 | if (ieee80211_vif_is_mesh(&sdata->vif)) | |
582 | queue_work(local->hw.workqueue, &sdata->u.mesh.work); | |
583 | rcu_read_unlock(); | |
584 | } | |
585 | ||
902acc78 JB |
586 | void ieee80211_mesh_init_sdata(struct ieee80211_sub_if_data *sdata) |
587 | { | |
472dbc45 JB |
588 | struct ieee80211_if_mesh *ifmsh = &sdata->u.mesh; |
589 | ||
590 | INIT_WORK(&ifmsh->work, ieee80211_mesh_work); | |
591 | setup_timer(&ifmsh->housekeeping_timer, | |
592 | ieee80211_mesh_housekeeping_timer, | |
593 | (unsigned long) sdata); | |
594 | skb_queue_head_init(&sdata->u.mesh.skb_queue); | |
595 | ||
596 | ifmsh->mshcfg.dot11MeshRetryTimeout = MESH_RET_T; | |
597 | ifmsh->mshcfg.dot11MeshConfirmTimeout = MESH_CONF_T; | |
598 | ifmsh->mshcfg.dot11MeshHoldingTimeout = MESH_HOLD_T; | |
599 | ifmsh->mshcfg.dot11MeshMaxRetries = MESH_MAX_RETR; | |
600 | ifmsh->mshcfg.dot11MeshTTL = MESH_TTL; | |
601 | ifmsh->mshcfg.auto_open_plinks = true; | |
602 | ifmsh->mshcfg.dot11MeshMaxPeerLinks = | |
902acc78 | 603 | MESH_MAX_ESTAB_PLINKS; |
472dbc45 | 604 | ifmsh->mshcfg.dot11MeshHWMPactivePathTimeout = |
902acc78 | 605 | MESH_PATH_TIMEOUT; |
472dbc45 | 606 | ifmsh->mshcfg.dot11MeshHWMPpreqMinInterval = |
902acc78 | 607 | MESH_PREQ_MIN_INT; |
472dbc45 | 608 | ifmsh->mshcfg.dot11MeshHWMPnetDiameterTraversalTime = |
902acc78 | 609 | MESH_DIAM_TRAVERSAL_TIME; |
472dbc45 | 610 | ifmsh->mshcfg.dot11MeshHWMPmaxPREQretries = |
902acc78 | 611 | MESH_MAX_PREQ_RETRIES; |
472dbc45 | 612 | ifmsh->mshcfg.path_refresh_time = |
902acc78 | 613 | MESH_PATH_REFRESH_TIME; |
472dbc45 | 614 | ifmsh->mshcfg.min_discovery_timeout = |
902acc78 | 615 | MESH_MIN_DISCOVERY_TIMEOUT; |
472dbc45 JB |
616 | ifmsh->accepting_plinks = true; |
617 | ifmsh->preq_id = 0; | |
618 | ifmsh->dsn = 0; | |
619 | atomic_set(&ifmsh->mpaths, 0); | |
f698d856 | 620 | mesh_rmc_init(sdata); |
472dbc45 | 621 | ifmsh->last_preq = jiffies; |
902acc78 JB |
622 | /* Allocate all mesh structures when creating the first mesh interface. */ |
623 | if (!mesh_allocated) | |
624 | ieee80211s_init(); | |
472dbc45 JB |
625 | mesh_ids_set_default(ifmsh); |
626 | setup_timer(&ifmsh->mesh_path_timer, | |
902acc78 JB |
627 | ieee80211_mesh_path_timer, |
628 | (unsigned long) sdata); | |
472dbc45 JB |
629 | INIT_LIST_HEAD(&ifmsh->preq_queue.list); |
630 | spin_lock_init(&ifmsh->mesh_preq_queue_lock); | |
631 | } | |
632 | ||
633 | ieee80211_rx_result | |
634 | ieee80211_mesh_rx_mgmt(struct ieee80211_sub_if_data *sdata, struct sk_buff *skb, | |
635 | struct ieee80211_rx_status *rx_status) | |
636 | { | |
637 | struct ieee80211_local *local = sdata->local; | |
638 | struct ieee80211_if_mesh *ifmsh = &sdata->u.mesh; | |
639 | struct ieee80211_mgmt *mgmt; | |
640 | u16 fc; | |
641 | ||
642 | if (skb->len < 24) | |
643 | return RX_DROP_MONITOR; | |
644 | ||
645 | mgmt = (struct ieee80211_mgmt *) skb->data; | |
646 | fc = le16_to_cpu(mgmt->frame_control); | |
647 | ||
648 | switch (fc & IEEE80211_FCTL_STYPE) { | |
649 | case IEEE80211_STYPE_PROBE_RESP: | |
650 | case IEEE80211_STYPE_BEACON: | |
651 | case IEEE80211_STYPE_ACTION: | |
652 | memcpy(skb->cb, rx_status, sizeof(*rx_status)); | |
653 | skb_queue_tail(&ifmsh->skb_queue, skb); | |
654 | queue_work(local->hw.workqueue, &ifmsh->work); | |
655 | return RX_QUEUED; | |
656 | } | |
657 | ||
658 | return RX_CONTINUE; | |
902acc78 | 659 | } |