1 /*
2 * Copyright (c) 2008, 2009 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
11 #include <linux/slab.h>
12 #include <asm/unaligned.h>
13 #include "ieee80211_i.h"
14 #include "mesh.h"
15
16 #define IEEE80211_MESH_PEER_INACTIVITY_LIMIT (1800 * HZ)
17 #define IEEE80211_MESH_HOUSEKEEPING_INTERVAL (60 * HZ)
18 #define IEEE80211_MESH_RANN_INTERVAL (1 * HZ)
19
20 #define MESHCONF_CAPAB_ACCEPT_PLINKS 0x01
21 #define MESHCONF_CAPAB_FORWARDING 0x08
22
23 #define TMR_RUNNING_HK 0
24 #define TMR_RUNNING_MP 1
25 #define TMR_RUNNING_MPR 2
26
27 int mesh_allocated;
28 static struct kmem_cache *rm_cache;
29
ieee80211s_init(void)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
ieee80211s_stop(void)38 void ieee80211s_stop(void)
39 {
40 mesh_pathtbl_unregister();
41 kmem_cache_destroy(rm_cache);
42 }
43
ieee80211_mesh_housekeeping_timer(unsigned long data)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 set_bit(MESH_WORK_HOUSEKEEPING, &ifmsh->wrkq_flags);
51
52 if (local->quiescing) {
53 set_bit(TMR_RUNNING_HK, &ifmsh->timers_running);
54 return;
55 }
56
57 ieee80211_queue_work(&local->hw, &sdata->work);
58 }
59
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
64 * @sdata: local mesh subif
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 */
mesh_matches_local(struct ieee802_11_elems * ie,struct ieee80211_sub_if_data * sdata)69 bool mesh_matches_local(struct ieee802_11_elems *ie, struct ieee80211_sub_if_data *sdata)
70 {
71 struct ieee80211_if_mesh *ifmsh = &sdata->u.mesh;
72
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 */
83 if (ifmsh->mesh_id_len == ie->mesh_id_len &&
84 memcmp(ifmsh->mesh_id, ie->mesh_id, ie->mesh_id_len) == 0 &&
85 (ifmsh->mesh_pp_id == ie->mesh_config->meshconf_psel) &&
86 (ifmsh->mesh_pm_id == ie->mesh_config->meshconf_pmetric) &&
87 (ifmsh->mesh_cc_id == ie->mesh_config->meshconf_congest) &&
88 (ifmsh->mesh_sp_id == ie->mesh_config->meshconf_synch) &&
89 (ifmsh->mesh_auth_id == ie->mesh_config->meshconf_auth))
90 return true;
91
92 return false;
93 }
94
95 /**
96 * mesh_peer_accepts_plinks - check if an mp is willing to establish peer links
97 *
98 * @ie: information elements of a management frame from the mesh peer
99 */
mesh_peer_accepts_plinks(struct ieee802_11_elems * ie)100 bool mesh_peer_accepts_plinks(struct ieee802_11_elems *ie)
101 {
102 return (ie->mesh_config->meshconf_cap &
103 MESHCONF_CAPAB_ACCEPT_PLINKS) != 0;
104 }
105
106 /**
107 * mesh_accept_plinks_update: update accepting_plink in local mesh beacons
108 *
109 * @sdata: mesh interface in which mesh beacons are going to be updated
110 */
mesh_accept_plinks_update(struct ieee80211_sub_if_data * sdata)111 void mesh_accept_plinks_update(struct ieee80211_sub_if_data *sdata)
112 {
113 bool free_plinks;
114
115 /* In case mesh_plink_free_count > 0 and mesh_plinktbl_capacity == 0,
116 * the mesh interface might be able to establish plinks with peers that
117 * are already on the table but are not on PLINK_ESTAB state. However,
118 * in general the mesh interface is not accepting peer link requests
119 * from new peers, and that must be reflected in the beacon
120 */
121 free_plinks = mesh_plink_availables(sdata);
122
123 if (free_plinks != sdata->u.mesh.accepting_plinks)
124 ieee80211_mesh_housekeeping_timer((unsigned long) sdata);
125 }
126
mesh_rmc_init(struct ieee80211_sub_if_data * sdata)127 int mesh_rmc_init(struct ieee80211_sub_if_data *sdata)
128 {
129 int i;
130
131 sdata->u.mesh.rmc = kmalloc(sizeof(struct mesh_rmc), GFP_KERNEL);
132 if (!sdata->u.mesh.rmc)
133 return -ENOMEM;
134 sdata->u.mesh.rmc->idx_mask = RMC_BUCKETS - 1;
135 for (i = 0; i < RMC_BUCKETS; i++)
136 INIT_LIST_HEAD(&sdata->u.mesh.rmc->bucket[i].list);
137 return 0;
138 }
139
mesh_rmc_free(struct ieee80211_sub_if_data * sdata)140 void mesh_rmc_free(struct ieee80211_sub_if_data *sdata)
141 {
142 struct mesh_rmc *rmc = sdata->u.mesh.rmc;
143 struct rmc_entry *p, *n;
144 int i;
145
146 if (!sdata->u.mesh.rmc)
147 return;
148
149 for (i = 0; i < RMC_BUCKETS; i++)
150 list_for_each_entry_safe(p, n, &rmc->bucket[i].list, list) {
151 list_del(&p->list);
152 kmem_cache_free(rm_cache, p);
153 }
154
155 kfree(rmc);
156 sdata->u.mesh.rmc = NULL;
157 }
158
159 /**
160 * mesh_rmc_check - Check frame in recent multicast cache and add if absent.
161 *
162 * @sa: source address
163 * @mesh_hdr: mesh_header
164 *
165 * Returns: 0 if the frame is not in the cache, nonzero otherwise.
166 *
167 * Checks using the source address and the mesh sequence number if we have
168 * received this frame lately. If the frame is not in the cache, it is added to
169 * it.
170 */
mesh_rmc_check(u8 * sa,struct ieee80211s_hdr * mesh_hdr,struct ieee80211_sub_if_data * sdata)171 int mesh_rmc_check(u8 *sa, struct ieee80211s_hdr *mesh_hdr,
172 struct ieee80211_sub_if_data *sdata)
173 {
174 struct mesh_rmc *rmc = sdata->u.mesh.rmc;
175 u32 seqnum = 0;
176 int entries = 0;
177 u8 idx;
178 struct rmc_entry *p, *n;
179
180 /* Don't care about endianness since only match matters */
181 memcpy(&seqnum, &mesh_hdr->seqnum, sizeof(mesh_hdr->seqnum));
182 idx = le32_to_cpu(mesh_hdr->seqnum) & rmc->idx_mask;
183 list_for_each_entry_safe(p, n, &rmc->bucket[idx].list, list) {
184 ++entries;
185 if (time_after(jiffies, p->exp_time) ||
186 (entries == RMC_QUEUE_MAX_LEN)) {
187 list_del(&p->list);
188 kmem_cache_free(rm_cache, p);
189 --entries;
190 } else if ((seqnum == p->seqnum) &&
191 (memcmp(sa, p->sa, ETH_ALEN) == 0))
192 return -1;
193 }
194
195 p = kmem_cache_alloc(rm_cache, GFP_ATOMIC);
196 if (!p) {
197 printk(KERN_DEBUG "o11s: could not allocate RMC entry\n");
198 return 0;
199 }
200 p->seqnum = seqnum;
201 p->exp_time = jiffies + RMC_TIMEOUT;
202 memcpy(p->sa, sa, ETH_ALEN);
203 list_add(&p->list, &rmc->bucket[idx].list);
204 return 0;
205 }
206
mesh_mgmt_ies_add(struct sk_buff * skb,struct ieee80211_sub_if_data * sdata)207 void mesh_mgmt_ies_add(struct sk_buff *skb, struct ieee80211_sub_if_data *sdata)
208 {
209 struct ieee80211_local *local = sdata->local;
210 struct ieee80211_supported_band *sband;
211 u8 *pos;
212 int len, i, rate;
213 u8 neighbors;
214
215 sband = local->hw.wiphy->bands[local->hw.conf.channel->band];
216 len = sband->n_bitrates;
217 if (len > 8)
218 len = 8;
219 pos = skb_put(skb, len + 2);
220 *pos++ = WLAN_EID_SUPP_RATES;
221 *pos++ = len;
222 for (i = 0; i < len; i++) {
223 rate = sband->bitrates[i].bitrate;
224 *pos++ = (u8) (rate / 5);
225 }
226
227 if (sband->n_bitrates > len) {
228 pos = skb_put(skb, sband->n_bitrates - len + 2);
229 *pos++ = WLAN_EID_EXT_SUPP_RATES;
230 *pos++ = sband->n_bitrates - len;
231 for (i = len; i < sband->n_bitrates; i++) {
232 rate = sband->bitrates[i].bitrate;
233 *pos++ = (u8) (rate / 5);
234 }
235 }
236
237 if (sband->band == IEEE80211_BAND_2GHZ) {
238 pos = skb_put(skb, 2 + 1);
239 *pos++ = WLAN_EID_DS_PARAMS;
240 *pos++ = 1;
241 *pos++ = ieee80211_frequency_to_channel(local->hw.conf.channel->center_freq);
242 }
243
244 pos = skb_put(skb, 2 + sdata->u.mesh.mesh_id_len);
245 *pos++ = WLAN_EID_MESH_ID;
246 *pos++ = sdata->u.mesh.mesh_id_len;
247 if (sdata->u.mesh.mesh_id_len)
248 memcpy(pos, sdata->u.mesh.mesh_id, sdata->u.mesh.mesh_id_len);
249
250 pos = skb_put(skb, 2 + sizeof(struct ieee80211_meshconf_ie));
251 *pos++ = WLAN_EID_MESH_CONFIG;
252 *pos++ = sizeof(struct ieee80211_meshconf_ie);
253
254 /* Active path selection protocol ID */
255 *pos++ = sdata->u.mesh.mesh_pp_id;
256
257 /* Active path selection metric ID */
258 *pos++ = sdata->u.mesh.mesh_pm_id;
259
260 /* Congestion control mode identifier */
261 *pos++ = sdata->u.mesh.mesh_cc_id;
262
263 /* Synchronization protocol identifier */
264 *pos++ = sdata->u.mesh.mesh_sp_id;
265
266 /* Authentication Protocol identifier */
267 *pos++ = sdata->u.mesh.mesh_auth_id;
268
269 /* Mesh Formation Info - number of neighbors */
270 neighbors = atomic_read(&sdata->u.mesh.mshstats.estab_plinks);
271 /* Number of neighbor mesh STAs or 15 whichever is smaller */
272 neighbors = (neighbors > 15) ? 15 : neighbors;
273 *pos++ = neighbors << 1;
274
275 /* Mesh capability */
276 sdata->u.mesh.accepting_plinks = mesh_plink_availables(sdata);
277 *pos = MESHCONF_CAPAB_FORWARDING;
278 *pos++ |= sdata->u.mesh.accepting_plinks ?
279 MESHCONF_CAPAB_ACCEPT_PLINKS : 0x00;
280 *pos++ = 0x00;
281
282 if (sdata->u.mesh.vendor_ie) {
283 int len = sdata->u.mesh.vendor_ie_len;
284 const u8 *data = sdata->u.mesh.vendor_ie;
285 if (skb_tailroom(skb) > len)
286 memcpy(skb_put(skb, len), data, len);
287 }
288 }
289
mesh_table_hash(u8 * addr,struct ieee80211_sub_if_data * sdata,struct mesh_table * tbl)290 u32 mesh_table_hash(u8 *addr, struct ieee80211_sub_if_data *sdata, struct mesh_table *tbl)
291 {
292 /* Use last four bytes of hw addr and interface index as hash index */
293 return jhash_2words(*(u32 *)(addr+2), sdata->dev->ifindex, tbl->hash_rnd)
294 & tbl->hash_mask;
295 }
296
mesh_table_alloc(int size_order)297 struct mesh_table *mesh_table_alloc(int size_order)
298 {
299 int i;
300 struct mesh_table *newtbl;
301
302 newtbl = kmalloc(sizeof(struct mesh_table), GFP_KERNEL);
303 if (!newtbl)
304 return NULL;
305
306 newtbl->hash_buckets = kzalloc(sizeof(struct hlist_head) *
307 (1 << size_order), GFP_KERNEL);
308
309 if (!newtbl->hash_buckets) {
310 kfree(newtbl);
311 return NULL;
312 }
313
314 newtbl->hashwlock = kmalloc(sizeof(spinlock_t) *
315 (1 << size_order), GFP_KERNEL);
316 if (!newtbl->hashwlock) {
317 kfree(newtbl->hash_buckets);
318 kfree(newtbl);
319 return NULL;
320 }
321
322 newtbl->size_order = size_order;
323 newtbl->hash_mask = (1 << size_order) - 1;
324 atomic_set(&newtbl->entries, 0);
325 get_random_bytes(&newtbl->hash_rnd,
326 sizeof(newtbl->hash_rnd));
327 for (i = 0; i <= newtbl->hash_mask; i++)
328 spin_lock_init(&newtbl->hashwlock[i]);
329
330 return newtbl;
331 }
332
333
ieee80211_mesh_path_timer(unsigned long data)334 static void ieee80211_mesh_path_timer(unsigned long data)
335 {
336 struct ieee80211_sub_if_data *sdata =
337 (struct ieee80211_sub_if_data *) data;
338 struct ieee80211_if_mesh *ifmsh = &sdata->u.mesh;
339 struct ieee80211_local *local = sdata->local;
340
341 if (local->quiescing) {
342 set_bit(TMR_RUNNING_MP, &ifmsh->timers_running);
343 return;
344 }
345
346 ieee80211_queue_work(&local->hw, &sdata->work);
347 }
348
ieee80211_mesh_path_root_timer(unsigned long data)349 static void ieee80211_mesh_path_root_timer(unsigned long data)
350 {
351 struct ieee80211_sub_if_data *sdata =
352 (struct ieee80211_sub_if_data *) data;
353 struct ieee80211_if_mesh *ifmsh = &sdata->u.mesh;
354 struct ieee80211_local *local = sdata->local;
355
356 set_bit(MESH_WORK_ROOT, &ifmsh->wrkq_flags);
357
358 if (local->quiescing) {
359 set_bit(TMR_RUNNING_MPR, &ifmsh->timers_running);
360 return;
361 }
362
363 ieee80211_queue_work(&local->hw, &sdata->work);
364 }
365
ieee80211_mesh_root_setup(struct ieee80211_if_mesh * ifmsh)366 void ieee80211_mesh_root_setup(struct ieee80211_if_mesh *ifmsh)
367 {
368 if (ifmsh->mshcfg.dot11MeshHWMPRootMode)
369 set_bit(MESH_WORK_ROOT, &ifmsh->wrkq_flags);
370 else {
371 clear_bit(MESH_WORK_ROOT, &ifmsh->wrkq_flags);
372 /* stop running timer */
373 del_timer_sync(&ifmsh->mesh_path_root_timer);
374 }
375 }
376
377 /**
378 * ieee80211_fill_mesh_addresses - fill addresses of a locally originated mesh frame
379 * @hdr: 802.11 frame header
380 * @fc: frame control field
381 * @meshda: destination address in the mesh
382 * @meshsa: source address address in the mesh. Same as TA, as frame is
383 * locally originated.
384 *
385 * Return the length of the 802.11 (does not include a mesh control header)
386 */
ieee80211_fill_mesh_addresses(struct ieee80211_hdr * hdr,__le16 * fc,const u8 * meshda,const u8 * meshsa)387 int ieee80211_fill_mesh_addresses(struct ieee80211_hdr *hdr, __le16 *fc,
388 const u8 *meshda, const u8 *meshsa)
389 {
390 if (is_multicast_ether_addr(meshda)) {
391 *fc |= cpu_to_le16(IEEE80211_FCTL_FROMDS);
392 /* DA TA SA */
393 memcpy(hdr->addr1, meshda, ETH_ALEN);
394 memcpy(hdr->addr2, meshsa, ETH_ALEN);
395 memcpy(hdr->addr3, meshsa, ETH_ALEN);
396 return 24;
397 } else {
398 *fc |= cpu_to_le16(IEEE80211_FCTL_FROMDS |
399 IEEE80211_FCTL_TODS);
400 /* RA TA DA SA */
401 memset(hdr->addr1, 0, ETH_ALEN); /* RA is resolved later */
402 memcpy(hdr->addr2, meshsa, ETH_ALEN);
403 memcpy(hdr->addr3, meshda, ETH_ALEN);
404 memcpy(hdr->addr4, meshsa, ETH_ALEN);
405 return 30;
406 }
407 }
408
409 /**
410 * ieee80211_new_mesh_header - create a new mesh header
411 * @meshhdr: uninitialized mesh header
412 * @sdata: mesh interface to be used
413 * @addr4or5: 1st address in the ae header, which may correspond to address 4
414 * (if addr6 is NULL) or address 5 (if addr6 is present). It may
415 * be NULL.
416 * @addr6: 2nd address in the ae header, which corresponds to addr6 of the
417 * mesh frame
418 *
419 * Return the header length.
420 */
ieee80211_new_mesh_header(struct ieee80211s_hdr * meshhdr,struct ieee80211_sub_if_data * sdata,char * addr4or5,char * addr6)421 int ieee80211_new_mesh_header(struct ieee80211s_hdr *meshhdr,
422 struct ieee80211_sub_if_data *sdata, char *addr4or5,
423 char *addr6)
424 {
425 int aelen = 0;
426 BUG_ON(!addr4or5 && addr6);
427 memset(meshhdr, 0, sizeof(*meshhdr));
428 meshhdr->ttl = sdata->u.mesh.mshcfg.dot11MeshTTL;
429 put_unaligned(cpu_to_le32(sdata->u.mesh.mesh_seqnum), &meshhdr->seqnum);
430 sdata->u.mesh.mesh_seqnum++;
431 if (addr4or5 && !addr6) {
432 meshhdr->flags |= MESH_FLAGS_AE_A4;
433 aelen += ETH_ALEN;
434 memcpy(meshhdr->eaddr1, addr4or5, ETH_ALEN);
435 } else if (addr4or5 && addr6) {
436 meshhdr->flags |= MESH_FLAGS_AE_A5_A6;
437 aelen += 2 * ETH_ALEN;
438 memcpy(meshhdr->eaddr1, addr4or5, ETH_ALEN);
439 memcpy(meshhdr->eaddr2, addr6, ETH_ALEN);
440 }
441 return 6 + aelen;
442 }
443
ieee80211_mesh_housekeeping(struct ieee80211_sub_if_data * sdata,struct ieee80211_if_mesh * ifmsh)444 static void ieee80211_mesh_housekeeping(struct ieee80211_sub_if_data *sdata,
445 struct ieee80211_if_mesh *ifmsh)
446 {
447 bool free_plinks;
448
449 #ifdef CONFIG_MAC80211_VERBOSE_DEBUG
450 printk(KERN_DEBUG "%s: running mesh housekeeping\n",
451 sdata->name);
452 #endif
453
454 ieee80211_sta_expire(sdata, IEEE80211_MESH_PEER_INACTIVITY_LIMIT);
455 mesh_path_expire(sdata);
456
457 free_plinks = mesh_plink_availables(sdata);
458 if (free_plinks != sdata->u.mesh.accepting_plinks)
459 ieee80211_bss_info_change_notify(sdata, BSS_CHANGED_BEACON);
460
461 mod_timer(&ifmsh->housekeeping_timer,
462 round_jiffies(jiffies + IEEE80211_MESH_HOUSEKEEPING_INTERVAL));
463 }
464
ieee80211_mesh_rootpath(struct ieee80211_sub_if_data * sdata)465 static void ieee80211_mesh_rootpath(struct ieee80211_sub_if_data *sdata)
466 {
467 struct ieee80211_if_mesh *ifmsh = &sdata->u.mesh;
468
469 mesh_path_tx_root_frame(sdata);
470 mod_timer(&ifmsh->mesh_path_root_timer,
471 round_jiffies(jiffies + IEEE80211_MESH_RANN_INTERVAL));
472 }
473
474 #ifdef CONFIG_PM
ieee80211_mesh_quiesce(struct ieee80211_sub_if_data * sdata)475 void ieee80211_mesh_quiesce(struct ieee80211_sub_if_data *sdata)
476 {
477 struct ieee80211_if_mesh *ifmsh = &sdata->u.mesh;
478
479 /* use atomic bitops in case both timers fire at the same time */
480
481 if (del_timer_sync(&ifmsh->housekeeping_timer))
482 set_bit(TMR_RUNNING_HK, &ifmsh->timers_running);
483 if (del_timer_sync(&ifmsh->mesh_path_timer))
484 set_bit(TMR_RUNNING_MP, &ifmsh->timers_running);
485 if (del_timer_sync(&ifmsh->mesh_path_root_timer))
486 set_bit(TMR_RUNNING_MPR, &ifmsh->timers_running);
487 }
488
ieee80211_mesh_restart(struct ieee80211_sub_if_data * sdata)489 void ieee80211_mesh_restart(struct ieee80211_sub_if_data *sdata)
490 {
491 struct ieee80211_if_mesh *ifmsh = &sdata->u.mesh;
492
493 if (test_and_clear_bit(TMR_RUNNING_HK, &ifmsh->timers_running))
494 add_timer(&ifmsh->housekeeping_timer);
495 if (test_and_clear_bit(TMR_RUNNING_MP, &ifmsh->timers_running))
496 add_timer(&ifmsh->mesh_path_timer);
497 if (test_and_clear_bit(TMR_RUNNING_MPR, &ifmsh->timers_running))
498 add_timer(&ifmsh->mesh_path_root_timer);
499 ieee80211_mesh_root_setup(ifmsh);
500 }
501 #endif
502
ieee80211_start_mesh(struct ieee80211_sub_if_data * sdata)503 void ieee80211_start_mesh(struct ieee80211_sub_if_data *sdata)
504 {
505 struct ieee80211_if_mesh *ifmsh = &sdata->u.mesh;
506 struct ieee80211_local *local = sdata->local;
507
508 local->fif_other_bss++;
509 /* mesh ifaces must set allmulti to forward mcast traffic */
510 atomic_inc(&local->iff_allmultis);
511 ieee80211_configure_filter(local);
512
513 ifmsh->mesh_cc_id = 0; /* Disabled */
514 ifmsh->mesh_sp_id = 0; /* Neighbor Offset */
515 ifmsh->mesh_auth_id = 0; /* Disabled */
516 set_bit(MESH_WORK_HOUSEKEEPING, &ifmsh->wrkq_flags);
517 ieee80211_mesh_root_setup(ifmsh);
518 ieee80211_queue_work(&local->hw, &sdata->work);
519 sdata->vif.bss_conf.beacon_int = MESH_DEFAULT_BEACON_INTERVAL;
520 ieee80211_bss_info_change_notify(sdata, BSS_CHANGED_BEACON |
521 BSS_CHANGED_BEACON_ENABLED |
522 BSS_CHANGED_BEACON_INT);
523 }
524
ieee80211_stop_mesh(struct ieee80211_sub_if_data * sdata)525 void ieee80211_stop_mesh(struct ieee80211_sub_if_data *sdata)
526 {
527 struct ieee80211_local *local = sdata->local;
528 struct ieee80211_if_mesh *ifmsh = &sdata->u.mesh;
529
530 ifmsh->mesh_id_len = 0;
531 ieee80211_bss_info_change_notify(sdata, BSS_CHANGED_BEACON_ENABLED);
532 sta_info_flush(local, NULL);
533
534 del_timer_sync(&sdata->u.mesh.housekeeping_timer);
535 del_timer_sync(&sdata->u.mesh.mesh_path_root_timer);
536 /*
537 * If the timer fired while we waited for it, it will have
538 * requeued the work. Now the work will be running again
539 * but will not rearm the timer again because it checks
540 * whether the interface is running, which, at this point,
541 * it no longer is.
542 */
543 cancel_work_sync(&sdata->work);
544
545 local->fif_other_bss--;
546 atomic_dec(&local->iff_allmultis);
547 ieee80211_configure_filter(local);
548 }
549
ieee80211_mesh_rx_bcn_presp(struct ieee80211_sub_if_data * sdata,u16 stype,struct ieee80211_mgmt * mgmt,size_t len,struct ieee80211_rx_status * rx_status)550 static void ieee80211_mesh_rx_bcn_presp(struct ieee80211_sub_if_data *sdata,
551 u16 stype,
552 struct ieee80211_mgmt *mgmt,
553 size_t len,
554 struct ieee80211_rx_status *rx_status)
555 {
556 struct ieee80211_local *local = sdata->local;
557 struct ieee802_11_elems elems;
558 struct ieee80211_channel *channel;
559 u32 supp_rates = 0;
560 size_t baselen;
561 int freq;
562 enum ieee80211_band band = rx_status->band;
563
564 /* ignore ProbeResp to foreign address */
565 if (stype == IEEE80211_STYPE_PROBE_RESP &&
566 compare_ether_addr(mgmt->da, sdata->vif.addr))
567 return;
568
569 baselen = (u8 *) mgmt->u.probe_resp.variable - (u8 *) mgmt;
570 if (baselen > len)
571 return;
572
573 ieee802_11_parse_elems(mgmt->u.probe_resp.variable, len - baselen,
574 &elems);
575
576 if (elems.ds_params && elems.ds_params_len == 1)
577 freq = ieee80211_channel_to_frequency(elems.ds_params[0], band);
578 else
579 freq = rx_status->freq;
580
581 channel = ieee80211_get_channel(local->hw.wiphy, freq);
582
583 if (!channel || channel->flags & IEEE80211_CHAN_DISABLED)
584 return;
585
586 if (elems.mesh_id && elems.mesh_config &&
587 mesh_matches_local(&elems, sdata)) {
588 supp_rates = ieee80211_sta_get_rates(local, &elems, band);
589
590 mesh_neighbour_update(mgmt->sa, supp_rates, sdata,
591 mesh_peer_accepts_plinks(&elems));
592 }
593 }
594
ieee80211_mesh_rx_mgmt_action(struct ieee80211_sub_if_data * sdata,struct ieee80211_mgmt * mgmt,size_t len,struct ieee80211_rx_status * rx_status)595 static void ieee80211_mesh_rx_mgmt_action(struct ieee80211_sub_if_data *sdata,
596 struct ieee80211_mgmt *mgmt,
597 size_t len,
598 struct ieee80211_rx_status *rx_status)
599 {
600 switch (mgmt->u.action.category) {
601 case WLAN_CATEGORY_MESH_PLINK:
602 mesh_rx_plink_frame(sdata, mgmt, len, rx_status);
603 break;
604 case WLAN_CATEGORY_MESH_PATH_SEL:
605 mesh_rx_path_sel_frame(sdata, mgmt, len);
606 break;
607 }
608 }
609
ieee80211_mesh_rx_queued_mgmt(struct ieee80211_sub_if_data * sdata,struct sk_buff * skb)610 void ieee80211_mesh_rx_queued_mgmt(struct ieee80211_sub_if_data *sdata,
611 struct sk_buff *skb)
612 {
613 struct ieee80211_rx_status *rx_status;
614 struct ieee80211_if_mesh *ifmsh;
615 struct ieee80211_mgmt *mgmt;
616 u16 stype;
617
618 ifmsh = &sdata->u.mesh;
619
620 rx_status = IEEE80211_SKB_RXCB(skb);
621 mgmt = (struct ieee80211_mgmt *) skb->data;
622 stype = le16_to_cpu(mgmt->frame_control) & IEEE80211_FCTL_STYPE;
623
624 switch (stype) {
625 case IEEE80211_STYPE_PROBE_RESP:
626 case IEEE80211_STYPE_BEACON:
627 ieee80211_mesh_rx_bcn_presp(sdata, stype, mgmt, skb->len,
628 rx_status);
629 break;
630 case IEEE80211_STYPE_ACTION:
631 ieee80211_mesh_rx_mgmt_action(sdata, mgmt, skb->len, rx_status);
632 break;
633 }
634 }
635
ieee80211_mesh_work(struct ieee80211_sub_if_data * sdata)636 void ieee80211_mesh_work(struct ieee80211_sub_if_data *sdata)
637 {
638 struct ieee80211_if_mesh *ifmsh = &sdata->u.mesh;
639
640 if (ifmsh->preq_queue_len &&
641 time_after(jiffies,
642 ifmsh->last_preq + msecs_to_jiffies(ifmsh->mshcfg.dot11MeshHWMPpreqMinInterval)))
643 mesh_path_start_discovery(sdata);
644
645 if (test_and_clear_bit(MESH_WORK_GROW_MPATH_TABLE, &ifmsh->wrkq_flags))
646 mesh_mpath_table_grow();
647
648 if (test_and_clear_bit(MESH_WORK_GROW_MPP_TABLE, &ifmsh->wrkq_flags))
649 mesh_mpp_table_grow();
650
651 if (test_and_clear_bit(MESH_WORK_HOUSEKEEPING, &ifmsh->wrkq_flags))
652 ieee80211_mesh_housekeeping(sdata, ifmsh);
653
654 if (test_and_clear_bit(MESH_WORK_ROOT, &ifmsh->wrkq_flags))
655 ieee80211_mesh_rootpath(sdata);
656 }
657
ieee80211_mesh_notify_scan_completed(struct ieee80211_local * local)658 void ieee80211_mesh_notify_scan_completed(struct ieee80211_local *local)
659 {
660 struct ieee80211_sub_if_data *sdata;
661
662 rcu_read_lock();
663 list_for_each_entry_rcu(sdata, &local->interfaces, list)
664 if (ieee80211_vif_is_mesh(&sdata->vif))
665 ieee80211_queue_work(&local->hw, &sdata->work);
666 rcu_read_unlock();
667 }
668
ieee80211_mesh_init_sdata(struct ieee80211_sub_if_data * sdata)669 void ieee80211_mesh_init_sdata(struct ieee80211_sub_if_data *sdata)
670 {
671 struct ieee80211_if_mesh *ifmsh = &sdata->u.mesh;
672
673 setup_timer(&ifmsh->housekeeping_timer,
674 ieee80211_mesh_housekeeping_timer,
675 (unsigned long) sdata);
676
677 ifmsh->accepting_plinks = true;
678 ifmsh->preq_id = 0;
679 ifmsh->sn = 0;
680 atomic_set(&ifmsh->mpaths, 0);
681 mesh_rmc_init(sdata);
682 ifmsh->last_preq = jiffies;
683 /* Allocate all mesh structures when creating the first mesh interface. */
684 if (!mesh_allocated)
685 ieee80211s_init();
686 setup_timer(&ifmsh->mesh_path_timer,
687 ieee80211_mesh_path_timer,
688 (unsigned long) sdata);
689 setup_timer(&ifmsh->mesh_path_root_timer,
690 ieee80211_mesh_path_root_timer,
691 (unsigned long) sdata);
692 INIT_LIST_HEAD(&ifmsh->preq_queue.list);
693 spin_lock_init(&ifmsh->mesh_preq_queue_lock);
694 }
695