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2e3c8736 | 1 | /* |
264d9b7d | 2 | * Copyright (c) 2008, 2009 open80211s Ltd. |
2e3c8736 LCC |
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) | |
e304bfd3 | 17 | #define IEEE80211_MESH_RANN_INTERVAL (1 * HZ) |
472dbc45 | 18 | |
3491707a RP |
19 | #define MESHCONF_CAPAB_ACCEPT_PLINKS 0x01 |
20 | #define MESHCONF_CAPAB_FORWARDING 0x08 | |
2e3c8736 | 21 | |
5bb644a0 JB |
22 | #define TMR_RUNNING_HK 0 |
23 | #define TMR_RUNNING_MP 1 | |
e304bfd3 | 24 | #define TMR_RUNNING_MPR 2 |
5bb644a0 | 25 | |
2e3c8736 LCC |
26 | int mesh_allocated; |
27 | static struct kmem_cache *rm_cache; | |
28 | ||
29 | void ieee80211s_init(void) | |
30 | { | |
31 | mesh_pathtbl_init(); | |
32 | mesh_allocated = 1; | |
33 | rm_cache = kmem_cache_create("mesh_rmc", sizeof(struct rmc_entry), | |
34 | 0, 0, NULL); | |
35 | } | |
36 | ||
37 | void ieee80211s_stop(void) | |
38 | { | |
39 | mesh_pathtbl_unregister(); | |
40 | kmem_cache_destroy(rm_cache); | |
41 | } | |
42 | ||
472dbc45 JB |
43 | static void ieee80211_mesh_housekeeping_timer(unsigned long data) |
44 | { | |
45 | struct ieee80211_sub_if_data *sdata = (void *) data; | |
46 | struct ieee80211_local *local = sdata->local; | |
47 | struct ieee80211_if_mesh *ifmsh = &sdata->u.mesh; | |
48 | ||
6b9ac442 | 49 | set_bit(MESH_WORK_HOUSEKEEPING, &ifmsh->wrkq_flags); |
5bb644a0 JB |
50 | |
51 | if (local->quiescing) { | |
52 | set_bit(TMR_RUNNING_HK, &ifmsh->timers_running); | |
53 | return; | |
54 | } | |
55 | ||
c03e20fc | 56 | ieee80211_queue_work(&local->hw, &ifmsh->work); |
472dbc45 JB |
57 | } |
58 | ||
2e3c8736 LCC |
59 | /** |
60 | * mesh_matches_local - check if the config of a mesh point matches ours | |
61 | * | |
62 | * @ie: information elements of a management frame from the mesh peer | |
f698d856 | 63 | * @sdata: local mesh subif |
2e3c8736 LCC |
64 | * |
65 | * This function checks if the mesh configuration of a mesh point matches the | |
66 | * local mesh configuration, i.e. if both nodes belong to the same mesh network. | |
67 | */ | |
f698d856 | 68 | bool mesh_matches_local(struct ieee802_11_elems *ie, struct ieee80211_sub_if_data *sdata) |
2e3c8736 | 69 | { |
472dbc45 | 70 | struct ieee80211_if_mesh *ifmsh = &sdata->u.mesh; |
2e3c8736 | 71 | |
2e3c8736 LCC |
72 | /* |
73 | * As support for each feature is added, check for matching | |
74 | * - On mesh config capabilities | |
75 | * - Power Save Support En | |
76 | * - Sync support enabled | |
77 | * - Sync support active | |
78 | * - Sync support required from peer | |
79 | * - MDA enabled | |
80 | * - Power management control on fc | |
81 | */ | |
472dbc45 JB |
82 | if (ifmsh->mesh_id_len == ie->mesh_id_len && |
83 | memcmp(ifmsh->mesh_id, ie->mesh_id, ie->mesh_id_len) == 0 && | |
136cfa28 RP |
84 | (ifmsh->mesh_pp_id == ie->mesh_config->meshconf_psel) && |
85 | (ifmsh->mesh_pm_id == ie->mesh_config->meshconf_pmetric) && | |
86 | (ifmsh->mesh_cc_id == ie->mesh_config->meshconf_congest) && | |
87 | (ifmsh->mesh_sp_id == ie->mesh_config->meshconf_synch) && | |
88 | (ifmsh->mesh_auth_id == ie->mesh_config->meshconf_auth)) | |
2e3c8736 LCC |
89 | return true; |
90 | ||
91 | return false; | |
92 | } | |
93 | ||
94 | /** | |
95 | * mesh_peer_accepts_plinks - check if an mp is willing to establish peer links | |
96 | * | |
97 | * @ie: information elements of a management frame from the mesh peer | |
2e3c8736 | 98 | */ |
f698d856 | 99 | bool mesh_peer_accepts_plinks(struct ieee802_11_elems *ie) |
2e3c8736 | 100 | { |
136cfa28 | 101 | return (ie->mesh_config->meshconf_cap & |
3491707a | 102 | MESHCONF_CAPAB_ACCEPT_PLINKS) != 0; |
2e3c8736 LCC |
103 | } |
104 | ||
105 | /** | |
106 | * mesh_accept_plinks_update: update accepting_plink in local mesh beacons | |
107 | * | |
d0709a65 | 108 | * @sdata: mesh interface in which mesh beacons are going to be updated |
2e3c8736 | 109 | */ |
d0709a65 | 110 | void mesh_accept_plinks_update(struct ieee80211_sub_if_data *sdata) |
2e3c8736 | 111 | { |
2e3c8736 LCC |
112 | bool free_plinks; |
113 | ||
114 | /* In case mesh_plink_free_count > 0 and mesh_plinktbl_capacity == 0, | |
115 | * the mesh interface might be able to establish plinks with peers that | |
b4e08ea1 LCC |
116 | * are already on the table but are not on PLINK_ESTAB state. However, |
117 | * in general the mesh interface is not accepting peer link requests | |
118 | * from new peers, and that must be reflected in the beacon | |
2e3c8736 LCC |
119 | */ |
120 | free_plinks = mesh_plink_availables(sdata); | |
121 | ||
472dbc45 JB |
122 | if (free_plinks != sdata->u.mesh.accepting_plinks) |
123 | ieee80211_mesh_housekeeping_timer((unsigned long) sdata); | |
2e3c8736 LCC |
124 | } |
125 | ||
472dbc45 | 126 | void mesh_ids_set_default(struct ieee80211_if_mesh *sta) |
2e3c8736 | 127 | { |
3491707a RP |
128 | sta->mesh_pp_id = 0; /* HWMP */ |
129 | sta->mesh_pm_id = 0; /* Airtime */ | |
130 | sta->mesh_cc_id = 0; /* Disabled */ | |
131 | sta->mesh_sp_id = 0; /* Neighbor Offset */ | |
132 | sta->mesh_auth_id = 0; /* Disabled */ | |
2e3c8736 LCC |
133 | } |
134 | ||
f698d856 | 135 | int mesh_rmc_init(struct ieee80211_sub_if_data *sdata) |
2e3c8736 | 136 | { |
2e3c8736 LCC |
137 | int i; |
138 | ||
472dbc45 JB |
139 | sdata->u.mesh.rmc = kmalloc(sizeof(struct mesh_rmc), GFP_KERNEL); |
140 | if (!sdata->u.mesh.rmc) | |
2e3c8736 | 141 | return -ENOMEM; |
472dbc45 | 142 | sdata->u.mesh.rmc->idx_mask = RMC_BUCKETS - 1; |
2e3c8736 | 143 | for (i = 0; i < RMC_BUCKETS; i++) |
472dbc45 | 144 | INIT_LIST_HEAD(&sdata->u.mesh.rmc->bucket[i].list); |
2e3c8736 LCC |
145 | return 0; |
146 | } | |
147 | ||
f698d856 | 148 | void mesh_rmc_free(struct ieee80211_sub_if_data *sdata) |
2e3c8736 | 149 | { |
472dbc45 | 150 | struct mesh_rmc *rmc = sdata->u.mesh.rmc; |
2e3c8736 LCC |
151 | struct rmc_entry *p, *n; |
152 | int i; | |
153 | ||
472dbc45 | 154 | if (!sdata->u.mesh.rmc) |
2e3c8736 LCC |
155 | return; |
156 | ||
157 | for (i = 0; i < RMC_BUCKETS; i++) | |
158 | list_for_each_entry_safe(p, n, &rmc->bucket[i].list, list) { | |
159 | list_del(&p->list); | |
160 | kmem_cache_free(rm_cache, p); | |
161 | } | |
162 | ||
163 | kfree(rmc); | |
472dbc45 | 164 | sdata->u.mesh.rmc = NULL; |
2e3c8736 LCC |
165 | } |
166 | ||
167 | /** | |
168 | * mesh_rmc_check - Check frame in recent multicast cache and add if absent. | |
169 | * | |
170 | * @sa: source address | |
171 | * @mesh_hdr: mesh_header | |
172 | * | |
173 | * Returns: 0 if the frame is not in the cache, nonzero otherwise. | |
174 | * | |
175 | * Checks using the source address and the mesh sequence number if we have | |
176 | * received this frame lately. If the frame is not in the cache, it is added to | |
177 | * it. | |
178 | */ | |
179 | int mesh_rmc_check(u8 *sa, struct ieee80211s_hdr *mesh_hdr, | |
f698d856 | 180 | struct ieee80211_sub_if_data *sdata) |
2e3c8736 | 181 | { |
472dbc45 | 182 | struct mesh_rmc *rmc = sdata->u.mesh.rmc; |
2e3c8736 LCC |
183 | u32 seqnum = 0; |
184 | int entries = 0; | |
185 | u8 idx; | |
186 | struct rmc_entry *p, *n; | |
187 | ||
188 | /* Don't care about endianness since only match matters */ | |
51ceddad LCC |
189 | memcpy(&seqnum, &mesh_hdr->seqnum, sizeof(mesh_hdr->seqnum)); |
190 | idx = le32_to_cpu(mesh_hdr->seqnum) & rmc->idx_mask; | |
2e3c8736 LCC |
191 | list_for_each_entry_safe(p, n, &rmc->bucket[idx].list, list) { |
192 | ++entries; | |
193 | if (time_after(jiffies, p->exp_time) || | |
194 | (entries == RMC_QUEUE_MAX_LEN)) { | |
195 | list_del(&p->list); | |
196 | kmem_cache_free(rm_cache, p); | |
197 | --entries; | |
f64f9e71 JP |
198 | } else if ((seqnum == p->seqnum) && |
199 | (memcmp(sa, p->sa, ETH_ALEN) == 0)) | |
2e3c8736 LCC |
200 | return -1; |
201 | } | |
202 | ||
203 | p = kmem_cache_alloc(rm_cache, GFP_ATOMIC); | |
204 | if (!p) { | |
205 | printk(KERN_DEBUG "o11s: could not allocate RMC entry\n"); | |
206 | return 0; | |
207 | } | |
208 | p->seqnum = seqnum; | |
209 | p->exp_time = jiffies + RMC_TIMEOUT; | |
210 | memcpy(p->sa, sa, ETH_ALEN); | |
211 | list_add(&p->list, &rmc->bucket[idx].list); | |
212 | return 0; | |
213 | } | |
214 | ||
f698d856 | 215 | void mesh_mgmt_ies_add(struct sk_buff *skb, struct ieee80211_sub_if_data *sdata) |
2e3c8736 | 216 | { |
f698d856 | 217 | struct ieee80211_local *local = sdata->local; |
2e3c8736 LCC |
218 | struct ieee80211_supported_band *sband; |
219 | u8 *pos; | |
220 | int len, i, rate; | |
8f2fda95 | 221 | u8 neighbors; |
2e3c8736 LCC |
222 | |
223 | sband = local->hw.wiphy->bands[local->hw.conf.channel->band]; | |
224 | len = sband->n_bitrates; | |
225 | if (len > 8) | |
226 | len = 8; | |
227 | pos = skb_put(skb, len + 2); | |
228 | *pos++ = WLAN_EID_SUPP_RATES; | |
229 | *pos++ = len; | |
230 | for (i = 0; i < len; i++) { | |
231 | rate = sband->bitrates[i].bitrate; | |
232 | *pos++ = (u8) (rate / 5); | |
233 | } | |
234 | ||
235 | if (sband->n_bitrates > len) { | |
236 | pos = skb_put(skb, sband->n_bitrates - len + 2); | |
237 | *pos++ = WLAN_EID_EXT_SUPP_RATES; | |
238 | *pos++ = sband->n_bitrates - len; | |
239 | for (i = len; i < sband->n_bitrates; i++) { | |
240 | rate = sband->bitrates[i].bitrate; | |
241 | *pos++ = (u8) (rate / 5); | |
242 | } | |
243 | } | |
244 | ||
be125c60 RP |
245 | if (sband->band == IEEE80211_BAND_2GHZ) { |
246 | pos = skb_put(skb, 2 + 1); | |
247 | *pos++ = WLAN_EID_DS_PARAMS; | |
248 | *pos++ = 1; | |
249 | *pos++ = ieee80211_frequency_to_channel(local->hw.conf.channel->center_freq); | |
250 | } | |
251 | ||
472dbc45 | 252 | pos = skb_put(skb, 2 + sdata->u.mesh.mesh_id_len); |
2e3c8736 | 253 | *pos++ = WLAN_EID_MESH_ID; |
472dbc45 JB |
254 | *pos++ = sdata->u.mesh.mesh_id_len; |
255 | if (sdata->u.mesh.mesh_id_len) | |
256 | memcpy(pos, sdata->u.mesh.mesh_id, sdata->u.mesh.mesh_id_len); | |
2e3c8736 | 257 | |
136cfa28 | 258 | pos = skb_put(skb, 2 + sizeof(struct ieee80211_meshconf_ie)); |
2e3c8736 | 259 | *pos++ = WLAN_EID_MESH_CONFIG; |
136cfa28 | 260 | *pos++ = sizeof(struct ieee80211_meshconf_ie); |
2e3c8736 LCC |
261 | |
262 | /* Active path selection protocol ID */ | |
3491707a | 263 | *pos++ = sdata->u.mesh.mesh_pp_id; |
2e3c8736 LCC |
264 | |
265 | /* Active path selection metric ID */ | |
3491707a | 266 | *pos++ = sdata->u.mesh.mesh_pm_id; |
2e3c8736 LCC |
267 | |
268 | /* Congestion control mode identifier */ | |
3491707a | 269 | *pos++ = sdata->u.mesh.mesh_cc_id; |
2e3c8736 | 270 | |
9e03fdfd | 271 | /* Synchronization protocol identifier */ |
3491707a | 272 | *pos++ = sdata->u.mesh.mesh_sp_id; |
2e3c8736 | 273 | |
9e03fdfd | 274 | /* Authentication Protocol identifier */ |
3491707a | 275 | *pos++ = sdata->u.mesh.mesh_auth_id; |
9e03fdfd | 276 | |
8f2fda95 RP |
277 | /* Mesh Formation Info - number of neighbors */ |
278 | neighbors = atomic_read(&sdata->u.mesh.mshstats.estab_plinks); | |
279 | /* Number of neighbor mesh STAs or 15 whichever is smaller */ | |
280 | neighbors = (neighbors > 15) ? 15 : neighbors; | |
281 | *pos++ = neighbors << 1; | |
9e03fdfd | 282 | |
2e3c8736 | 283 | /* Mesh capability */ |
472dbc45 | 284 | sdata->u.mesh.accepting_plinks = mesh_plink_availables(sdata); |
3491707a RP |
285 | *pos = MESHCONF_CAPAB_FORWARDING; |
286 | *pos++ |= sdata->u.mesh.accepting_plinks ? | |
287 | MESHCONF_CAPAB_ACCEPT_PLINKS : 0x00; | |
2e3c8736 LCC |
288 | *pos++ = 0x00; |
289 | ||
290 | return; | |
291 | } | |
292 | ||
f698d856 | 293 | u32 mesh_table_hash(u8 *addr, struct ieee80211_sub_if_data *sdata, struct mesh_table *tbl) |
2e3c8736 LCC |
294 | { |
295 | /* Use last four bytes of hw addr and interface index as hash index */ | |
f698d856 | 296 | return jhash_2words(*(u32 *)(addr+2), sdata->dev->ifindex, tbl->hash_rnd) |
2e3c8736 LCC |
297 | & tbl->hash_mask; |
298 | } | |
299 | ||
2e3c8736 LCC |
300 | struct mesh_table *mesh_table_alloc(int size_order) |
301 | { | |
302 | int i; | |
303 | struct mesh_table *newtbl; | |
304 | ||
305 | newtbl = kmalloc(sizeof(struct mesh_table), GFP_KERNEL); | |
306 | if (!newtbl) | |
307 | return NULL; | |
308 | ||
309 | newtbl->hash_buckets = kzalloc(sizeof(struct hlist_head) * | |
310 | (1 << size_order), GFP_KERNEL); | |
311 | ||
312 | if (!newtbl->hash_buckets) { | |
313 | kfree(newtbl); | |
314 | return NULL; | |
315 | } | |
316 | ||
317 | newtbl->hashwlock = kmalloc(sizeof(spinlock_t) * | |
318 | (1 << size_order), GFP_KERNEL); | |
319 | if (!newtbl->hashwlock) { | |
320 | kfree(newtbl->hash_buckets); | |
321 | kfree(newtbl); | |
322 | return NULL; | |
323 | } | |
324 | ||
325 | newtbl->size_order = size_order; | |
326 | newtbl->hash_mask = (1 << size_order) - 1; | |
327 | atomic_set(&newtbl->entries, 0); | |
328 | get_random_bytes(&newtbl->hash_rnd, | |
329 | sizeof(newtbl->hash_rnd)); | |
330 | for (i = 0; i <= newtbl->hash_mask; i++) | |
331 | spin_lock_init(&newtbl->hashwlock[i]); | |
332 | ||
333 | return newtbl; | |
334 | } | |
335 | ||
2e3c8736 LCC |
336 | |
337 | static void ieee80211_mesh_path_timer(unsigned long data) | |
338 | { | |
339 | struct ieee80211_sub_if_data *sdata = | |
340 | (struct ieee80211_sub_if_data *) data; | |
472dbc45 | 341 | struct ieee80211_if_mesh *ifmsh = &sdata->u.mesh; |
133b8226 | 342 | struct ieee80211_local *local = sdata->local; |
2e3c8736 | 343 | |
5bb644a0 JB |
344 | if (local->quiescing) { |
345 | set_bit(TMR_RUNNING_MP, &ifmsh->timers_running); | |
346 | return; | |
347 | } | |
348 | ||
c03e20fc | 349 | ieee80211_queue_work(&local->hw, &ifmsh->work); |
2e3c8736 LCC |
350 | } |
351 | ||
e304bfd3 RP |
352 | static void ieee80211_mesh_path_root_timer(unsigned long data) |
353 | { | |
354 | struct ieee80211_sub_if_data *sdata = | |
355 | (struct ieee80211_sub_if_data *) data; | |
356 | struct ieee80211_if_mesh *ifmsh = &sdata->u.mesh; | |
357 | struct ieee80211_local *local = sdata->local; | |
358 | ||
359 | set_bit(MESH_WORK_ROOT, &ifmsh->wrkq_flags); | |
360 | ||
361 | if (local->quiescing) { | |
362 | set_bit(TMR_RUNNING_MPR, &ifmsh->timers_running); | |
363 | return; | |
364 | } | |
365 | ||
366 | ieee80211_queue_work(&local->hw, &ifmsh->work); | |
367 | } | |
368 | ||
63c5723b RP |
369 | void ieee80211_mesh_root_setup(struct ieee80211_if_mesh *ifmsh) |
370 | { | |
371 | if (ifmsh->mshcfg.dot11MeshHWMPRootMode) | |
372 | set_bit(MESH_WORK_ROOT, &ifmsh->wrkq_flags); | |
373 | else { | |
374 | clear_bit(MESH_WORK_ROOT, &ifmsh->wrkq_flags); | |
375 | /* stop running timer */ | |
376 | del_timer_sync(&ifmsh->mesh_path_root_timer); | |
377 | } | |
378 | } | |
379 | ||
3c5772a5 JC |
380 | /** |
381 | * ieee80211_fill_mesh_addresses - fill addresses of a locally originated mesh frame | |
382 | * @hdr: 802.11 frame header | |
383 | * @fc: frame control field | |
384 | * @meshda: destination address in the mesh | |
385 | * @meshsa: source address address in the mesh. Same as TA, as frame is | |
386 | * locally originated. | |
387 | * | |
388 | * Return the length of the 802.11 (does not include a mesh control header) | |
389 | */ | |
15ff6365 JB |
390 | int ieee80211_fill_mesh_addresses(struct ieee80211_hdr *hdr, __le16 *fc, |
391 | const u8 *meshda, const u8 *meshsa) | |
392 | { | |
3c5772a5 JC |
393 | if (is_multicast_ether_addr(meshda)) { |
394 | *fc |= cpu_to_le16(IEEE80211_FCTL_FROMDS); | |
395 | /* DA TA SA */ | |
396 | memcpy(hdr->addr1, meshda, ETH_ALEN); | |
397 | memcpy(hdr->addr2, meshsa, ETH_ALEN); | |
398 | memcpy(hdr->addr3, meshsa, ETH_ALEN); | |
399 | return 24; | |
400 | } else { | |
401 | *fc |= cpu_to_le16(IEEE80211_FCTL_FROMDS | | |
402 | IEEE80211_FCTL_TODS); | |
403 | /* RA TA DA SA */ | |
404 | memset(hdr->addr1, 0, ETH_ALEN); /* RA is resolved later */ | |
405 | memcpy(hdr->addr2, meshsa, ETH_ALEN); | |
406 | memcpy(hdr->addr3, meshda, ETH_ALEN); | |
407 | memcpy(hdr->addr4, meshsa, ETH_ALEN); | |
408 | return 30; | |
409 | } | |
410 | } | |
411 | ||
902acc78 JB |
412 | /** |
413 | * ieee80211_new_mesh_header - create a new mesh header | |
414 | * @meshhdr: uninitialized mesh header | |
415 | * @sdata: mesh interface to be used | |
3c5772a5 JC |
416 | * @addr4: addr4 of the mesh frame (1st in ae header) |
417 | * may be NULL | |
418 | * @addr5: addr5 of the mesh frame (1st or 2nd in ae header) | |
419 | * may be NULL unless addr6 is present | |
420 | * @addr6: addr6 of the mesh frame (2nd or 3rd in ae header) | |
421 | * may be NULL unless addr5 is present | |
902acc78 JB |
422 | * |
423 | * Return the header length. | |
424 | */ | |
425 | int ieee80211_new_mesh_header(struct ieee80211s_hdr *meshhdr, | |
3c5772a5 JC |
426 | struct ieee80211_sub_if_data *sdata, char *addr4, |
427 | char *addr5, char *addr6) | |
902acc78 | 428 | { |
3c5772a5 JC |
429 | int aelen = 0; |
430 | memset(meshhdr, 0, sizeof(meshhdr)); | |
472dbc45 JB |
431 | meshhdr->ttl = sdata->u.mesh.mshcfg.dot11MeshTTL; |
432 | put_unaligned(cpu_to_le32(sdata->u.mesh.mesh_seqnum), &meshhdr->seqnum); | |
433 | sdata->u.mesh.mesh_seqnum++; | |
3c5772a5 JC |
434 | if (addr4) { |
435 | meshhdr->flags |= MESH_FLAGS_AE_A4; | |
436 | aelen += ETH_ALEN; | |
437 | memcpy(meshhdr->eaddr1, addr4, ETH_ALEN); | |
438 | } | |
439 | if (addr5 && addr6) { | |
440 | meshhdr->flags |= MESH_FLAGS_AE_A5_A6; | |
441 | aelen += 2 * ETH_ALEN; | |
442 | if (!addr4) { | |
443 | memcpy(meshhdr->eaddr1, addr5, ETH_ALEN); | |
444 | memcpy(meshhdr->eaddr2, addr6, ETH_ALEN); | |
445 | } else { | |
446 | memcpy(meshhdr->eaddr2, addr5, ETH_ALEN); | |
447 | memcpy(meshhdr->eaddr3, addr6, ETH_ALEN); | |
448 | } | |
449 | } | |
450 | return 6 + aelen; | |
902acc78 JB |
451 | } |
452 | ||
472dbc45 JB |
453 | static void ieee80211_mesh_housekeeping(struct ieee80211_sub_if_data *sdata, |
454 | struct ieee80211_if_mesh *ifmsh) | |
455 | { | |
456 | bool free_plinks; | |
457 | ||
458 | #ifdef CONFIG_MAC80211_VERBOSE_DEBUG | |
459 | printk(KERN_DEBUG "%s: running mesh housekeeping\n", | |
47846c9b | 460 | sdata->name); |
472dbc45 JB |
461 | #endif |
462 | ||
463 | ieee80211_sta_expire(sdata, IEEE80211_MESH_PEER_INACTIVITY_LIMIT); | |
464 | mesh_path_expire(sdata); | |
465 | ||
466 | free_plinks = mesh_plink_availables(sdata); | |
467 | if (free_plinks != sdata->u.mesh.accepting_plinks) | |
2d0ddec5 | 468 | ieee80211_bss_info_change_notify(sdata, BSS_CHANGED_BEACON); |
472dbc45 | 469 | |
472dbc45 JB |
470 | mod_timer(&ifmsh->housekeeping_timer, |
471 | round_jiffies(jiffies + IEEE80211_MESH_HOUSEKEEPING_INTERVAL)); | |
472 | } | |
473 | ||
e304bfd3 RP |
474 | static void ieee80211_mesh_rootpath(struct ieee80211_sub_if_data *sdata) |
475 | { | |
476 | struct ieee80211_if_mesh *ifmsh = &sdata->u.mesh; | |
477 | ||
478 | mesh_path_tx_root_frame(sdata); | |
479 | mod_timer(&ifmsh->mesh_path_root_timer, | |
480 | round_jiffies(jiffies + IEEE80211_MESH_RANN_INTERVAL)); | |
481 | } | |
482 | ||
5bb644a0 JB |
483 | #ifdef CONFIG_PM |
484 | void ieee80211_mesh_quiesce(struct ieee80211_sub_if_data *sdata) | |
485 | { | |
486 | struct ieee80211_if_mesh *ifmsh = &sdata->u.mesh; | |
487 | ||
488 | /* might restart the timer but that doesn't matter */ | |
489 | cancel_work_sync(&ifmsh->work); | |
490 | ||
491 | /* use atomic bitops in case both timers fire at the same time */ | |
492 | ||
493 | if (del_timer_sync(&ifmsh->housekeeping_timer)) | |
494 | set_bit(TMR_RUNNING_HK, &ifmsh->timers_running); | |
495 | if (del_timer_sync(&ifmsh->mesh_path_timer)) | |
496 | set_bit(TMR_RUNNING_MP, &ifmsh->timers_running); | |
e304bfd3 RP |
497 | if (del_timer_sync(&ifmsh->mesh_path_root_timer)) |
498 | set_bit(TMR_RUNNING_MPR, &ifmsh->timers_running); | |
5bb644a0 JB |
499 | } |
500 | ||
501 | void ieee80211_mesh_restart(struct ieee80211_sub_if_data *sdata) | |
502 | { | |
503 | struct ieee80211_if_mesh *ifmsh = &sdata->u.mesh; | |
504 | ||
505 | if (test_and_clear_bit(TMR_RUNNING_HK, &ifmsh->timers_running)) | |
506 | add_timer(&ifmsh->housekeeping_timer); | |
507 | if (test_and_clear_bit(TMR_RUNNING_MP, &ifmsh->timers_running)) | |
508 | add_timer(&ifmsh->mesh_path_timer); | |
e304bfd3 RP |
509 | if (test_and_clear_bit(TMR_RUNNING_MPR, &ifmsh->timers_running)) |
510 | add_timer(&ifmsh->mesh_path_root_timer); | |
63c5723b | 511 | ieee80211_mesh_root_setup(ifmsh); |
5bb644a0 JB |
512 | } |
513 | #endif | |
472dbc45 JB |
514 | |
515 | void ieee80211_start_mesh(struct ieee80211_sub_if_data *sdata) | |
516 | { | |
517 | struct ieee80211_if_mesh *ifmsh = &sdata->u.mesh; | |
518 | struct ieee80211_local *local = sdata->local; | |
519 | ||
6b9ac442 | 520 | set_bit(MESH_WORK_HOUSEKEEPING, &ifmsh->wrkq_flags); |
63c5723b | 521 | ieee80211_mesh_root_setup(ifmsh); |
18889231 | 522 | ieee80211_queue_work(&local->hw, &ifmsh->work); |
5b365834 | 523 | sdata->vif.bss_conf.beacon_int = MESH_DEFAULT_BEACON_INTERVAL; |
2d0ddec5 | 524 | ieee80211_bss_info_change_notify(sdata, BSS_CHANGED_BEACON | |
5b365834 JC |
525 | BSS_CHANGED_BEACON_ENABLED | |
526 | BSS_CHANGED_BEACON_INT); | |
472dbc45 JB |
527 | } |
528 | ||
529 | void ieee80211_stop_mesh(struct ieee80211_sub_if_data *sdata) | |
530 | { | |
531 | del_timer_sync(&sdata->u.mesh.housekeeping_timer); | |
e304bfd3 | 532 | del_timer_sync(&sdata->u.mesh.mesh_path_root_timer); |
b7413430 JB |
533 | /* |
534 | * If the timer fired while we waited for it, it will have | |
535 | * requeued the work. Now the work will be running again | |
536 | * but will not rearm the timer again because it checks | |
537 | * whether the interface is running, which, at this point, | |
538 | * it no longer is. | |
539 | */ | |
540 | cancel_work_sync(&sdata->u.mesh.work); | |
541 | ||
472dbc45 JB |
542 | /* |
543 | * When we get here, the interface is marked down. | |
544 | * Call synchronize_rcu() to wait for the RX path | |
545 | * should it be using the interface and enqueuing | |
546 | * frames at this very time on another CPU. | |
547 | */ | |
4a27096b | 548 | rcu_barrier(); /* Wait for RX path and call_rcu()'s */ |
472dbc45 JB |
549 | skb_queue_purge(&sdata->u.mesh.skb_queue); |
550 | } | |
551 | ||
552 | static void ieee80211_mesh_rx_bcn_presp(struct ieee80211_sub_if_data *sdata, | |
553 | u16 stype, | |
554 | struct ieee80211_mgmt *mgmt, | |
555 | size_t len, | |
556 | struct ieee80211_rx_status *rx_status) | |
557 | { | |
c6a1fa12 | 558 | struct ieee80211_local *local = sdata->local; |
472dbc45 JB |
559 | struct ieee802_11_elems elems; |
560 | struct ieee80211_channel *channel; | |
881d948c | 561 | u32 supp_rates = 0; |
472dbc45 JB |
562 | size_t baselen; |
563 | int freq; | |
564 | enum ieee80211_band band = rx_status->band; | |
565 | ||
566 | /* ignore ProbeResp to foreign address */ | |
567 | if (stype == IEEE80211_STYPE_PROBE_RESP && | |
47846c9b | 568 | compare_ether_addr(mgmt->da, sdata->vif.addr)) |
472dbc45 JB |
569 | return; |
570 | ||
571 | baselen = (u8 *) mgmt->u.probe_resp.variable - (u8 *) mgmt; | |
572 | if (baselen > len) | |
573 | return; | |
574 | ||
575 | ieee802_11_parse_elems(mgmt->u.probe_resp.variable, len - baselen, | |
576 | &elems); | |
577 | ||
578 | if (elems.ds_params && elems.ds_params_len == 1) | |
579 | freq = ieee80211_channel_to_frequency(elems.ds_params[0]); | |
580 | else | |
581 | freq = rx_status->freq; | |
582 | ||
583 | channel = ieee80211_get_channel(local->hw.wiphy, freq); | |
584 | ||
585 | if (!channel || channel->flags & IEEE80211_CHAN_DISABLED) | |
586 | return; | |
587 | ||
588 | if (elems.mesh_id && elems.mesh_config && | |
589 | mesh_matches_local(&elems, sdata)) { | |
590 | supp_rates = ieee80211_sta_get_rates(local, &elems, band); | |
591 | ||
592 | mesh_neighbour_update(mgmt->sa, supp_rates, sdata, | |
593 | mesh_peer_accepts_plinks(&elems)); | |
594 | } | |
595 | } | |
596 | ||
597 | static void ieee80211_mesh_rx_mgmt_action(struct ieee80211_sub_if_data *sdata, | |
598 | struct ieee80211_mgmt *mgmt, | |
599 | size_t len, | |
600 | struct ieee80211_rx_status *rx_status) | |
601 | { | |
602 | switch (mgmt->u.action.category) { | |
0938393f | 603 | case MESH_PLINK_CATEGORY: |
472dbc45 JB |
604 | mesh_rx_plink_frame(sdata, mgmt, len, rx_status); |
605 | break; | |
606 | case MESH_PATH_SEL_CATEGORY: | |
607 | mesh_rx_path_sel_frame(sdata, mgmt, len); | |
608 | break; | |
609 | } | |
610 | } | |
611 | ||
612 | static void ieee80211_mesh_rx_queued_mgmt(struct ieee80211_sub_if_data *sdata, | |
613 | struct sk_buff *skb) | |
614 | { | |
615 | struct ieee80211_rx_status *rx_status; | |
616 | struct ieee80211_if_mesh *ifmsh; | |
617 | struct ieee80211_mgmt *mgmt; | |
618 | u16 stype; | |
619 | ||
620 | ifmsh = &sdata->u.mesh; | |
621 | ||
f1d58c25 | 622 | rx_status = IEEE80211_SKB_RXCB(skb); |
472dbc45 JB |
623 | mgmt = (struct ieee80211_mgmt *) skb->data; |
624 | stype = le16_to_cpu(mgmt->frame_control) & IEEE80211_FCTL_STYPE; | |
625 | ||
626 | switch (stype) { | |
627 | case IEEE80211_STYPE_PROBE_RESP: | |
628 | case IEEE80211_STYPE_BEACON: | |
629 | ieee80211_mesh_rx_bcn_presp(sdata, stype, mgmt, skb->len, | |
630 | rx_status); | |
631 | break; | |
632 | case IEEE80211_STYPE_ACTION: | |
633 | ieee80211_mesh_rx_mgmt_action(sdata, mgmt, skb->len, rx_status); | |
634 | break; | |
635 | } | |
636 | ||
637 | kfree_skb(skb); | |
638 | } | |
639 | ||
640 | static void ieee80211_mesh_work(struct work_struct *work) | |
641 | { | |
642 | struct ieee80211_sub_if_data *sdata = | |
643 | container_of(work, struct ieee80211_sub_if_data, u.mesh.work); | |
644 | struct ieee80211_local *local = sdata->local; | |
645 | struct ieee80211_if_mesh *ifmsh = &sdata->u.mesh; | |
646 | struct sk_buff *skb; | |
647 | ||
648 | if (!netif_running(sdata->dev)) | |
649 | return; | |
650 | ||
fbe9c429 | 651 | if (local->scanning) |
472dbc45 JB |
652 | return; |
653 | ||
654 | while ((skb = skb_dequeue(&ifmsh->skb_queue))) | |
655 | ieee80211_mesh_rx_queued_mgmt(sdata, skb); | |
656 | ||
657 | if (ifmsh->preq_queue_len && | |
658 | time_after(jiffies, | |
659 | ifmsh->last_preq + msecs_to_jiffies(ifmsh->mshcfg.dot11MeshHWMPpreqMinInterval))) | |
660 | mesh_path_start_discovery(sdata); | |
661 | ||
18889231 JC |
662 | if (test_and_clear_bit(MESH_WORK_GROW_MPATH_TABLE, &ifmsh->wrkq_flags)) |
663 | mesh_mpath_table_grow(); | |
664 | ||
665 | if (test_and_clear_bit(MESH_WORK_GROW_MPATH_TABLE, &ifmsh->wrkq_flags)) | |
666 | mesh_mpp_table_grow(); | |
667 | ||
668 | if (test_and_clear_bit(MESH_WORK_HOUSEKEEPING, &ifmsh->wrkq_flags)) | |
472dbc45 | 669 | ieee80211_mesh_housekeeping(sdata, ifmsh); |
e304bfd3 RP |
670 | |
671 | if (test_and_clear_bit(MESH_WORK_ROOT, &ifmsh->wrkq_flags)) | |
672 | ieee80211_mesh_rootpath(sdata); | |
472dbc45 JB |
673 | } |
674 | ||
675 | void ieee80211_mesh_notify_scan_completed(struct ieee80211_local *local) | |
676 | { | |
677 | struct ieee80211_sub_if_data *sdata; | |
678 | ||
679 | rcu_read_lock(); | |
680 | list_for_each_entry_rcu(sdata, &local->interfaces, list) | |
681 | if (ieee80211_vif_is_mesh(&sdata->vif)) | |
c03e20fc | 682 | ieee80211_queue_work(&local->hw, &sdata->u.mesh.work); |
472dbc45 JB |
683 | rcu_read_unlock(); |
684 | } | |
685 | ||
902acc78 JB |
686 | void ieee80211_mesh_init_sdata(struct ieee80211_sub_if_data *sdata) |
687 | { | |
472dbc45 JB |
688 | struct ieee80211_if_mesh *ifmsh = &sdata->u.mesh; |
689 | ||
690 | INIT_WORK(&ifmsh->work, ieee80211_mesh_work); | |
691 | setup_timer(&ifmsh->housekeeping_timer, | |
692 | ieee80211_mesh_housekeeping_timer, | |
693 | (unsigned long) sdata); | |
694 | skb_queue_head_init(&sdata->u.mesh.skb_queue); | |
695 | ||
696 | ifmsh->mshcfg.dot11MeshRetryTimeout = MESH_RET_T; | |
697 | ifmsh->mshcfg.dot11MeshConfirmTimeout = MESH_CONF_T; | |
698 | ifmsh->mshcfg.dot11MeshHoldingTimeout = MESH_HOLD_T; | |
699 | ifmsh->mshcfg.dot11MeshMaxRetries = MESH_MAX_RETR; | |
700 | ifmsh->mshcfg.dot11MeshTTL = MESH_TTL; | |
701 | ifmsh->mshcfg.auto_open_plinks = true; | |
702 | ifmsh->mshcfg.dot11MeshMaxPeerLinks = | |
902acc78 | 703 | MESH_MAX_ESTAB_PLINKS; |
472dbc45 | 704 | ifmsh->mshcfg.dot11MeshHWMPactivePathTimeout = |
902acc78 | 705 | MESH_PATH_TIMEOUT; |
472dbc45 | 706 | ifmsh->mshcfg.dot11MeshHWMPpreqMinInterval = |
902acc78 | 707 | MESH_PREQ_MIN_INT; |
472dbc45 | 708 | ifmsh->mshcfg.dot11MeshHWMPnetDiameterTraversalTime = |
902acc78 | 709 | MESH_DIAM_TRAVERSAL_TIME; |
472dbc45 | 710 | ifmsh->mshcfg.dot11MeshHWMPmaxPREQretries = |
902acc78 | 711 | MESH_MAX_PREQ_RETRIES; |
472dbc45 | 712 | ifmsh->mshcfg.path_refresh_time = |
902acc78 | 713 | MESH_PATH_REFRESH_TIME; |
472dbc45 | 714 | ifmsh->mshcfg.min_discovery_timeout = |
902acc78 | 715 | MESH_MIN_DISCOVERY_TIMEOUT; |
472dbc45 JB |
716 | ifmsh->accepting_plinks = true; |
717 | ifmsh->preq_id = 0; | |
d19b3bf6 | 718 | ifmsh->sn = 0; |
472dbc45 | 719 | atomic_set(&ifmsh->mpaths, 0); |
f698d856 | 720 | mesh_rmc_init(sdata); |
472dbc45 | 721 | ifmsh->last_preq = jiffies; |
902acc78 JB |
722 | /* Allocate all mesh structures when creating the first mesh interface. */ |
723 | if (!mesh_allocated) | |
724 | ieee80211s_init(); | |
472dbc45 JB |
725 | mesh_ids_set_default(ifmsh); |
726 | setup_timer(&ifmsh->mesh_path_timer, | |
902acc78 JB |
727 | ieee80211_mesh_path_timer, |
728 | (unsigned long) sdata); | |
e304bfd3 RP |
729 | setup_timer(&ifmsh->mesh_path_root_timer, |
730 | ieee80211_mesh_path_root_timer, | |
731 | (unsigned long) sdata); | |
472dbc45 JB |
732 | INIT_LIST_HEAD(&ifmsh->preq_queue.list); |
733 | spin_lock_init(&ifmsh->mesh_preq_queue_lock); | |
734 | } | |
735 | ||
736 | ieee80211_rx_result | |
f1d58c25 | 737 | ieee80211_mesh_rx_mgmt(struct ieee80211_sub_if_data *sdata, struct sk_buff *skb) |
472dbc45 JB |
738 | { |
739 | struct ieee80211_local *local = sdata->local; | |
740 | struct ieee80211_if_mesh *ifmsh = &sdata->u.mesh; | |
741 | struct ieee80211_mgmt *mgmt; | |
742 | u16 fc; | |
743 | ||
744 | if (skb->len < 24) | |
745 | return RX_DROP_MONITOR; | |
746 | ||
747 | mgmt = (struct ieee80211_mgmt *) skb->data; | |
748 | fc = le16_to_cpu(mgmt->frame_control); | |
749 | ||
750 | switch (fc & IEEE80211_FCTL_STYPE) { | |
a43816df JB |
751 | case IEEE80211_STYPE_ACTION: |
752 | if (skb->len < IEEE80211_MIN_ACTION_SIZE) | |
753 | return RX_DROP_MONITOR; | |
754 | /* fall through */ | |
472dbc45 JB |
755 | case IEEE80211_STYPE_PROBE_RESP: |
756 | case IEEE80211_STYPE_BEACON: | |
472dbc45 | 757 | skb_queue_tail(&ifmsh->skb_queue, skb); |
c03e20fc | 758 | ieee80211_queue_work(&local->hw, &ifmsh->work); |
472dbc45 JB |
759 | return RX_QUEUED; |
760 | } | |
761 | ||
762 | return RX_CONTINUE; | |
902acc78 | 763 | } |