mac80211: minor code cleanups
[linux-2.6.git] / net / mac80211 / mesh.c
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
11 #include <asm/unaligned.h>
12 #include "ieee80211_i.h"
13 #include "mesh.h"
14
15 #define IEEE80211_MESH_PEER_INACTIVITY_LIMIT (1800 * HZ)
16 #define IEEE80211_MESH_HOUSEKEEPING_INTERVAL (60 * HZ)
17
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
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
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
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
55  * @sdata: local mesh subif
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  */
60 bool mesh_matches_local(struct ieee802_11_elems *ie, struct ieee80211_sub_if_data *sdata)
61 {
62         struct ieee80211_if_mesh *ifmsh = &sdata->u.mesh;
63
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          */
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)
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
88  */
89 bool mesh_peer_accepts_plinks(struct ieee802_11_elems *ie)
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  *
97  * @sdata: mesh interface in which mesh beacons are going to be updated
98  */
99 void mesh_accept_plinks_update(struct ieee80211_sub_if_data *sdata)
100 {
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
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
108          */
109         free_plinks = mesh_plink_availables(sdata);
110
111         if (free_plinks != sdata->u.mesh.accepting_plinks)
112                 ieee80211_mesh_housekeeping_timer((unsigned long) sdata);
113 }
114
115 void mesh_ids_set_default(struct ieee80211_if_mesh *sta)
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
124 int mesh_rmc_init(struct ieee80211_sub_if_data *sdata)
125 {
126         int i;
127
128         sdata->u.mesh.rmc = kmalloc(sizeof(struct mesh_rmc), GFP_KERNEL);
129         if (!sdata->u.mesh.rmc)
130                 return -ENOMEM;
131         sdata->u.mesh.rmc->idx_mask = RMC_BUCKETS - 1;
132         for (i = 0; i < RMC_BUCKETS; i++)
133                 INIT_LIST_HEAD(&sdata->u.mesh.rmc->bucket[i].list);
134         return 0;
135 }
136
137 void mesh_rmc_free(struct ieee80211_sub_if_data *sdata)
138 {
139         struct mesh_rmc *rmc = sdata->u.mesh.rmc;
140         struct rmc_entry *p, *n;
141         int i;
142
143         if (!sdata->u.mesh.rmc)
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);
153         sdata->u.mesh.rmc = NULL;
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,
169                    struct ieee80211_sub_if_data *sdata)
170 {
171         struct mesh_rmc *rmc = sdata->u.mesh.rmc;
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 */
178         memcpy(&seqnum, &mesh_hdr->seqnum, sizeof(mesh_hdr->seqnum));
179         idx = le32_to_cpu(mesh_hdr->seqnum) & rmc->idx_mask;
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
204 void mesh_mgmt_ies_add(struct sk_buff *skb, struct ieee80211_sub_if_data *sdata)
205 {
206         struct ieee80211_local *local = sdata->local;
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
233         pos = skb_put(skb, 2 + sdata->u.mesh.mesh_id_len);
234         *pos++ = WLAN_EID_MESH_ID;
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);
238
239         pos = skb_put(skb, 21);
240         *pos++ = WLAN_EID_MESH_CONFIG;
241         *pos++ = MESH_CFG_LEN;
242         /* Version */
243         *pos++ = 1;
244
245         /* Active path selection protocol ID */
246         memcpy(pos, sdata->u.mesh.mesh_pp_id, 4);
247         pos += 4;
248
249         /* Active path selection metric ID   */
250         memcpy(pos, sdata->u.mesh.mesh_pm_id, 4);
251         pos += 4;
252
253         /* Congestion control mode identifier */
254         memcpy(pos, sdata->u.mesh.mesh_cc_id, 4);
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 */
264         sdata->u.mesh.accepting_plinks = mesh_plink_availables(sdata);
265         *pos++ = sdata->u.mesh.accepting_plinks ? ACCEPT_PLINKS : 0x00;
266         *pos++ = 0x00;
267
268         return;
269 }
270
271 u32 mesh_table_hash(u8 *addr, struct ieee80211_sub_if_data *sdata, struct mesh_table *tbl)
272 {
273         /* Use last four bytes of hw addr and interface index as hash index */
274         return jhash_2words(*(u32 *)(addr+2), sdata->dev->ifindex, tbl->hash_rnd)
275                 & tbl->hash_mask;
276 }
277
278 u8 mesh_id_hash(u8 *mesh_id, int mesh_id_len)
279 {
280         if (!mesh_id_len)
281                 return 1;
282         else if (mesh_id_len == 1)
283                 return (u8) mesh_id[0];
284         else
285                 return (u8) (mesh_id[0] + 2 * mesh_id[1]);
286 }
287
288 struct mesh_table *mesh_table_alloc(int size_order)
289 {
290         int i;
291         struct mesh_table *newtbl;
292
293         newtbl = kmalloc(sizeof(struct mesh_table), GFP_KERNEL);
294         if (!newtbl)
295                 return NULL;
296
297         newtbl->hash_buckets = kzalloc(sizeof(struct hlist_head) *
298                         (1 << size_order), GFP_KERNEL);
299
300         if (!newtbl->hash_buckets) {
301                 kfree(newtbl);
302                 return NULL;
303         }
304
305         newtbl->hashwlock = kmalloc(sizeof(spinlock_t) *
306                         (1 << size_order), GFP_KERNEL);
307         if (!newtbl->hashwlock) {
308                 kfree(newtbl->hash_buckets);
309                 kfree(newtbl);
310                 return NULL;
311         }
312
313         newtbl->size_order = size_order;
314         newtbl->hash_mask = (1 << size_order) - 1;
315         atomic_set(&newtbl->entries,  0);
316         get_random_bytes(&newtbl->hash_rnd,
317                         sizeof(newtbl->hash_rnd));
318         for (i = 0; i <= newtbl->hash_mask; i++)
319                 spin_lock_init(&newtbl->hashwlock[i]);
320
321         return newtbl;
322 }
323
324 static void __mesh_table_free(struct mesh_table *tbl)
325 {
326         kfree(tbl->hash_buckets);
327         kfree(tbl->hashwlock);
328         kfree(tbl);
329 }
330
331 void mesh_table_free(struct mesh_table *tbl, bool free_leafs)
332 {
333         struct hlist_head *mesh_hash;
334         struct hlist_node *p, *q;
335         int i;
336
337         mesh_hash = tbl->hash_buckets;
338         for (i = 0; i <= tbl->hash_mask; i++) {
339                 spin_lock(&tbl->hashwlock[i]);
340                 hlist_for_each_safe(p, q, &mesh_hash[i]) {
341                         tbl->free_node(p, free_leafs);
342                         atomic_dec(&tbl->entries);
343                 }
344                 spin_unlock(&tbl->hashwlock[i]);
345         }
346         __mesh_table_free(tbl);
347 }
348
349 static void ieee80211_mesh_path_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         queue_work(local->hw.workqueue, &ifmsh->work);
357 }
358
359 struct mesh_table *mesh_table_grow(struct mesh_table *tbl)
360 {
361         struct mesh_table *newtbl;
362         struct hlist_head *oldhash;
363         struct hlist_node *p, *q;
364         int i;
365
366         if (atomic_read(&tbl->entries)
367                         < tbl->mean_chain_len * (tbl->hash_mask + 1))
368                 goto endgrow;
369
370         newtbl = mesh_table_alloc(tbl->size_order + 1);
371         if (!newtbl)
372                 goto endgrow;
373
374         newtbl->free_node = tbl->free_node;
375         newtbl->mean_chain_len = tbl->mean_chain_len;
376         newtbl->copy_node = tbl->copy_node;
377         atomic_set(&newtbl->entries, atomic_read(&tbl->entries));
378
379         oldhash = tbl->hash_buckets;
380         for (i = 0; i <= tbl->hash_mask; i++)
381                 hlist_for_each(p, &oldhash[i])
382                         if (tbl->copy_node(p, newtbl) < 0)
383                                 goto errcopy;
384
385         return newtbl;
386
387 errcopy:
388         for (i = 0; i <= newtbl->hash_mask; i++) {
389                 hlist_for_each_safe(p, q, &newtbl->hash_buckets[i])
390                         tbl->free_node(p, 0);
391         }
392         __mesh_table_free(newtbl);
393 endgrow:
394         return NULL;
395 }
396
397 /**
398  * ieee80211_new_mesh_header - create a new mesh header
399  * @meshhdr:    uninitialized mesh header
400  * @sdata:      mesh interface to be used
401  *
402  * Return the header length.
403  */
404 int ieee80211_new_mesh_header(struct ieee80211s_hdr *meshhdr,
405                 struct ieee80211_sub_if_data *sdata)
406 {
407         meshhdr->flags = 0;
408         meshhdr->ttl = sdata->u.mesh.mshcfg.dot11MeshTTL;
409         put_unaligned(cpu_to_le32(sdata->u.mesh.mesh_seqnum), &meshhdr->seqnum);
410         sdata->u.mesh.mesh_seqnum++;
411
412         return 6;
413 }
414
415 static void ieee80211_mesh_housekeeping(struct ieee80211_sub_if_data *sdata,
416                            struct ieee80211_if_mesh *ifmsh)
417 {
418         bool free_plinks;
419
420 #ifdef CONFIG_MAC80211_VERBOSE_DEBUG
421         printk(KERN_DEBUG "%s: running mesh housekeeping\n",
422                sdata->dev->name);
423 #endif
424
425         ieee80211_sta_expire(sdata, IEEE80211_MESH_PEER_INACTIVITY_LIMIT);
426         mesh_path_expire(sdata);
427
428         free_plinks = mesh_plink_availables(sdata);
429         if (free_plinks != sdata->u.mesh.accepting_plinks)
430                 ieee80211_if_config(sdata, IEEE80211_IFCC_BEACON);
431
432         ifmsh->housekeeping = false;
433         mod_timer(&ifmsh->housekeeping_timer,
434                   round_jiffies(jiffies + IEEE80211_MESH_HOUSEKEEPING_INTERVAL));
435 }
436
437
438 void ieee80211_start_mesh(struct ieee80211_sub_if_data *sdata)
439 {
440         struct ieee80211_if_mesh *ifmsh = &sdata->u.mesh;
441         struct ieee80211_local *local = sdata->local;
442
443         ifmsh->housekeeping = true;
444         queue_work(local->hw.workqueue, &ifmsh->work);
445         ieee80211_if_config(sdata, IEEE80211_IFCC_BEACON);
446 }
447
448 void ieee80211_stop_mesh(struct ieee80211_sub_if_data *sdata)
449 {
450         del_timer_sync(&sdata->u.mesh.housekeeping_timer);
451         /*
452          * If the timer fired while we waited for it, it will have
453          * requeued the work. Now the work will be running again
454          * but will not rearm the timer again because it checks
455          * whether the interface is running, which, at this point,
456          * it no longer is.
457          */
458         cancel_work_sync(&sdata->u.mesh.work);
459
460         /*
461          * When we get here, the interface is marked down.
462          * Call synchronize_rcu() to wait for the RX path
463          * should it be using the interface and enqueuing
464          * frames at this very time on another CPU.
465          */
466         synchronize_rcu();
467         skb_queue_purge(&sdata->u.mesh.skb_queue);
468 }
469
470 static void ieee80211_mesh_rx_bcn_presp(struct ieee80211_sub_if_data *sdata,
471                                         u16 stype,
472                                         struct ieee80211_mgmt *mgmt,
473                                         size_t len,
474                                         struct ieee80211_rx_status *rx_status)
475 {
476         struct ieee80211_local *local = sdata->local;
477         struct ieee802_11_elems elems;
478         struct ieee80211_channel *channel;
479         u64 supp_rates = 0;
480         size_t baselen;
481         int freq;
482         enum ieee80211_band band = rx_status->band;
483
484         /* ignore ProbeResp to foreign address */
485         if (stype == IEEE80211_STYPE_PROBE_RESP &&
486             compare_ether_addr(mgmt->da, sdata->dev->dev_addr))
487                 return;
488
489         baselen = (u8 *) mgmt->u.probe_resp.variable - (u8 *) mgmt;
490         if (baselen > len)
491                 return;
492
493         ieee802_11_parse_elems(mgmt->u.probe_resp.variable, len - baselen,
494                                &elems);
495
496         if (elems.ds_params && elems.ds_params_len == 1)
497                 freq = ieee80211_channel_to_frequency(elems.ds_params[0]);
498         else
499                 freq = rx_status->freq;
500
501         channel = ieee80211_get_channel(local->hw.wiphy, freq);
502
503         if (!channel || channel->flags & IEEE80211_CHAN_DISABLED)
504                 return;
505
506         if (elems.mesh_id && elems.mesh_config &&
507             mesh_matches_local(&elems, sdata)) {
508                 supp_rates = ieee80211_sta_get_rates(local, &elems, band);
509
510                 mesh_neighbour_update(mgmt->sa, supp_rates, sdata,
511                                       mesh_peer_accepts_plinks(&elems));
512         }
513 }
514
515 static void ieee80211_mesh_rx_mgmt_action(struct ieee80211_sub_if_data *sdata,
516                                           struct ieee80211_mgmt *mgmt,
517                                           size_t len,
518                                           struct ieee80211_rx_status *rx_status)
519 {
520         switch (mgmt->u.action.category) {
521         case PLINK_CATEGORY:
522                 mesh_rx_plink_frame(sdata, mgmt, len, rx_status);
523                 break;
524         case MESH_PATH_SEL_CATEGORY:
525                 mesh_rx_path_sel_frame(sdata, mgmt, len);
526                 break;
527         }
528 }
529
530 static void ieee80211_mesh_rx_queued_mgmt(struct ieee80211_sub_if_data *sdata,
531                                           struct sk_buff *skb)
532 {
533         struct ieee80211_rx_status *rx_status;
534         struct ieee80211_if_mesh *ifmsh;
535         struct ieee80211_mgmt *mgmt;
536         u16 stype;
537
538         ifmsh = &sdata->u.mesh;
539
540         rx_status = (struct ieee80211_rx_status *) skb->cb;
541         mgmt = (struct ieee80211_mgmt *) skb->data;
542         stype = le16_to_cpu(mgmt->frame_control) & IEEE80211_FCTL_STYPE;
543
544         switch (stype) {
545         case IEEE80211_STYPE_PROBE_RESP:
546         case IEEE80211_STYPE_BEACON:
547                 ieee80211_mesh_rx_bcn_presp(sdata, stype, mgmt, skb->len,
548                                             rx_status);
549                 break;
550         case IEEE80211_STYPE_ACTION:
551                 ieee80211_mesh_rx_mgmt_action(sdata, mgmt, skb->len, rx_status);
552                 break;
553         }
554
555         kfree_skb(skb);
556 }
557
558 static void ieee80211_mesh_work(struct work_struct *work)
559 {
560         struct ieee80211_sub_if_data *sdata =
561                 container_of(work, struct ieee80211_sub_if_data, u.mesh.work);
562         struct ieee80211_local *local = sdata->local;
563         struct ieee80211_if_mesh *ifmsh = &sdata->u.mesh;
564         struct sk_buff *skb;
565
566         if (!netif_running(sdata->dev))
567                 return;
568
569         if (local->sw_scanning || local->hw_scanning)
570                 return;
571
572         while ((skb = skb_dequeue(&ifmsh->skb_queue)))
573                 ieee80211_mesh_rx_queued_mgmt(sdata, skb);
574
575         if (ifmsh->preq_queue_len &&
576             time_after(jiffies,
577                        ifmsh->last_preq + msecs_to_jiffies(ifmsh->mshcfg.dot11MeshHWMPpreqMinInterval)))
578                 mesh_path_start_discovery(sdata);
579
580         if (ifmsh->housekeeping)
581                 ieee80211_mesh_housekeeping(sdata, ifmsh);
582 }
583
584 void ieee80211_mesh_notify_scan_completed(struct ieee80211_local *local)
585 {
586         struct ieee80211_sub_if_data *sdata;
587
588         rcu_read_lock();
589         list_for_each_entry_rcu(sdata, &local->interfaces, list)
590                 if (ieee80211_vif_is_mesh(&sdata->vif))
591                         queue_work(local->hw.workqueue, &sdata->u.mesh.work);
592         rcu_read_unlock();
593 }
594
595 void ieee80211_mesh_init_sdata(struct ieee80211_sub_if_data *sdata)
596 {
597         struct ieee80211_if_mesh *ifmsh = &sdata->u.mesh;
598
599         INIT_WORK(&ifmsh->work, ieee80211_mesh_work);
600         setup_timer(&ifmsh->housekeeping_timer,
601                     ieee80211_mesh_housekeeping_timer,
602                     (unsigned long) sdata);
603         skb_queue_head_init(&sdata->u.mesh.skb_queue);
604
605         ifmsh->mshcfg.dot11MeshRetryTimeout = MESH_RET_T;
606         ifmsh->mshcfg.dot11MeshConfirmTimeout = MESH_CONF_T;
607         ifmsh->mshcfg.dot11MeshHoldingTimeout = MESH_HOLD_T;
608         ifmsh->mshcfg.dot11MeshMaxRetries = MESH_MAX_RETR;
609         ifmsh->mshcfg.dot11MeshTTL = MESH_TTL;
610         ifmsh->mshcfg.auto_open_plinks = true;
611         ifmsh->mshcfg.dot11MeshMaxPeerLinks =
612                 MESH_MAX_ESTAB_PLINKS;
613         ifmsh->mshcfg.dot11MeshHWMPactivePathTimeout =
614                 MESH_PATH_TIMEOUT;
615         ifmsh->mshcfg.dot11MeshHWMPpreqMinInterval =
616                 MESH_PREQ_MIN_INT;
617         ifmsh->mshcfg.dot11MeshHWMPnetDiameterTraversalTime =
618                 MESH_DIAM_TRAVERSAL_TIME;
619         ifmsh->mshcfg.dot11MeshHWMPmaxPREQretries =
620                 MESH_MAX_PREQ_RETRIES;
621         ifmsh->mshcfg.path_refresh_time =
622                 MESH_PATH_REFRESH_TIME;
623         ifmsh->mshcfg.min_discovery_timeout =
624                 MESH_MIN_DISCOVERY_TIMEOUT;
625         ifmsh->accepting_plinks = true;
626         ifmsh->preq_id = 0;
627         ifmsh->dsn = 0;
628         atomic_set(&ifmsh->mpaths, 0);
629         mesh_rmc_init(sdata);
630         ifmsh->last_preq = jiffies;
631         /* Allocate all mesh structures when creating the first mesh interface. */
632         if (!mesh_allocated)
633                 ieee80211s_init();
634         mesh_ids_set_default(ifmsh);
635         setup_timer(&ifmsh->mesh_path_timer,
636                     ieee80211_mesh_path_timer,
637                     (unsigned long) sdata);
638         INIT_LIST_HEAD(&ifmsh->preq_queue.list);
639         spin_lock_init(&ifmsh->mesh_preq_queue_lock);
640 }
641
642 ieee80211_rx_result
643 ieee80211_mesh_rx_mgmt(struct ieee80211_sub_if_data *sdata, struct sk_buff *skb,
644                        struct ieee80211_rx_status *rx_status)
645 {
646         struct ieee80211_local *local = sdata->local;
647         struct ieee80211_if_mesh *ifmsh = &sdata->u.mesh;
648         struct ieee80211_mgmt *mgmt;
649         u16 fc;
650
651         if (skb->len < 24)
652                 return RX_DROP_MONITOR;
653
654         mgmt = (struct ieee80211_mgmt *) skb->data;
655         fc = le16_to_cpu(mgmt->frame_control);
656
657         switch (fc & IEEE80211_FCTL_STYPE) {
658         case IEEE80211_STYPE_PROBE_RESP:
659         case IEEE80211_STYPE_BEACON:
660         case IEEE80211_STYPE_ACTION:
661                 memcpy(skb->cb, rx_status, sizeof(*rx_status));
662                 skb_queue_tail(&ifmsh->skb_queue, skb);
663                 queue_work(local->hw.workqueue, &ifmsh->work);
664                 return RX_QUEUED;
665         }
666
667         return RX_CONTINUE;
668 }