6a43314295988c76067017be5d19de785e404d54
[linux-2.6.git] / net / mac80211 / mesh.c
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 <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 #define IEEE80211_MESH_RANN_INTERVAL         (1 * HZ)
18
19 #define MESHCONF_CAPAB_ACCEPT_PLINKS 0x01
20 #define MESHCONF_CAPAB_FORWARDING    0x08
21
22 #define TMR_RUNNING_HK  0
23 #define TMR_RUNNING_MP  1
24 #define TMR_RUNNING_MPR 2
25
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
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
49         set_bit(MESH_WORK_HOUSEKEEPING, &ifmsh->wrkq_flags);
50
51         if (local->quiescing) {
52                 set_bit(TMR_RUNNING_HK, &ifmsh->timers_running);
53                 return;
54         }
55
56         ieee80211_queue_work(&local->hw, &ifmsh->work);
57 }
58
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
63  * @sdata: local mesh subif
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  */
68 bool mesh_matches_local(struct ieee802_11_elems *ie, struct ieee80211_sub_if_data *sdata)
69 {
70         struct ieee80211_if_mesh *ifmsh = &sdata->u.mesh;
71
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          */
82         if (ifmsh->mesh_id_len == ie->mesh_id_len &&
83                 memcmp(ifmsh->mesh_id, ie->mesh_id, ie->mesh_id_len) == 0 &&
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))
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
98  */
99 bool mesh_peer_accepts_plinks(struct ieee802_11_elems *ie)
100 {
101         return (ie->mesh_config->meshconf_cap &
102             MESHCONF_CAPAB_ACCEPT_PLINKS) != 0;
103 }
104
105 /**
106  * mesh_accept_plinks_update: update accepting_plink in local mesh beacons
107  *
108  * @sdata: mesh interface in which mesh beacons are going to be updated
109  */
110 void mesh_accept_plinks_update(struct ieee80211_sub_if_data *sdata)
111 {
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
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
119          */
120         free_plinks = mesh_plink_availables(sdata);
121
122         if (free_plinks != sdata->u.mesh.accepting_plinks)
123                 ieee80211_mesh_housekeeping_timer((unsigned long) sdata);
124 }
125
126 void mesh_ids_set_default(struct ieee80211_if_mesh *sta)
127 {
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 */
133 }
134
135 int mesh_rmc_init(struct ieee80211_sub_if_data *sdata)
136 {
137         int i;
138
139         sdata->u.mesh.rmc = kmalloc(sizeof(struct mesh_rmc), GFP_KERNEL);
140         if (!sdata->u.mesh.rmc)
141                 return -ENOMEM;
142         sdata->u.mesh.rmc->idx_mask = RMC_BUCKETS - 1;
143         for (i = 0; i < RMC_BUCKETS; i++)
144                 INIT_LIST_HEAD(&sdata->u.mesh.rmc->bucket[i].list);
145         return 0;
146 }
147
148 void mesh_rmc_free(struct ieee80211_sub_if_data *sdata)
149 {
150         struct mesh_rmc *rmc = sdata->u.mesh.rmc;
151         struct rmc_entry *p, *n;
152         int i;
153
154         if (!sdata->u.mesh.rmc)
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);
164         sdata->u.mesh.rmc = NULL;
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,
180                    struct ieee80211_sub_if_data *sdata)
181 {
182         struct mesh_rmc *rmc = sdata->u.mesh.rmc;
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 */
189         memcpy(&seqnum, &mesh_hdr->seqnum, sizeof(mesh_hdr->seqnum));
190         idx = le32_to_cpu(mesh_hdr->seqnum) & rmc->idx_mask;
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;
198                 } else if ((seqnum == p->seqnum) &&
199                            (memcmp(sa, p->sa, ETH_ALEN) == 0))
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
215 void mesh_mgmt_ies_add(struct sk_buff *skb, struct ieee80211_sub_if_data *sdata)
216 {
217         struct ieee80211_local *local = sdata->local;
218         struct ieee80211_supported_band *sband;
219         u8 *pos;
220         int len, i, rate;
221         u8 neighbors;
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
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
252         pos = skb_put(skb, 2 + sdata->u.mesh.mesh_id_len);
253         *pos++ = WLAN_EID_MESH_ID;
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);
257
258         pos = skb_put(skb, 2 + sizeof(struct ieee80211_meshconf_ie));
259         *pos++ = WLAN_EID_MESH_CONFIG;
260         *pos++ = sizeof(struct ieee80211_meshconf_ie);
261
262         /* Active path selection protocol ID */
263         *pos++ = sdata->u.mesh.mesh_pp_id;
264
265         /* Active path selection metric ID   */
266         *pos++ = sdata->u.mesh.mesh_pm_id;
267
268         /* Congestion control mode identifier */
269         *pos++ = sdata->u.mesh.mesh_cc_id;
270
271         /* Synchronization protocol identifier */
272         *pos++ = sdata->u.mesh.mesh_sp_id;
273
274         /* Authentication Protocol identifier */
275         *pos++ = sdata->u.mesh.mesh_auth_id;
276
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;
282
283         /* Mesh capability */
284         sdata->u.mesh.accepting_plinks = mesh_plink_availables(sdata);
285         *pos = MESHCONF_CAPAB_FORWARDING;
286         *pos++ |= sdata->u.mesh.accepting_plinks ?
287             MESHCONF_CAPAB_ACCEPT_PLINKS : 0x00;
288         *pos++ = 0x00;
289
290         return;
291 }
292
293 u32 mesh_table_hash(u8 *addr, struct ieee80211_sub_if_data *sdata, struct mesh_table *tbl)
294 {
295         /* Use last four bytes of hw addr and interface index as hash index */
296         return jhash_2words(*(u32 *)(addr+2), sdata->dev->ifindex, tbl->hash_rnd)
297                 & tbl->hash_mask;
298 }
299
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
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;
341         struct ieee80211_if_mesh *ifmsh = &sdata->u.mesh;
342         struct ieee80211_local *local = sdata->local;
343
344         if (local->quiescing) {
345                 set_bit(TMR_RUNNING_MP, &ifmsh->timers_running);
346                 return;
347         }
348
349         ieee80211_queue_work(&local->hw, &ifmsh->work);
350 }
351
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
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
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  */
390 int ieee80211_fill_mesh_addresses(struct ieee80211_hdr *hdr, __le16 *fc,
391                                   const u8 *meshda, const u8 *meshsa)
392 {
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
412 /**
413  * ieee80211_new_mesh_header - create a new mesh header
414  * @meshhdr:    uninitialized mesh header
415  * @sdata:      mesh interface to be used
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
422  *
423  * Return the header length.
424  */
425 int ieee80211_new_mesh_header(struct ieee80211s_hdr *meshhdr,
426                 struct ieee80211_sub_if_data *sdata, char *addr4,
427                 char *addr5, char *addr6)
428 {
429         int aelen = 0;
430         memset(meshhdr, 0, sizeof(*meshhdr));
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++;
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;
451 }
452
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",
460                sdata->dev->name);
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)
468                 ieee80211_bss_info_change_notify(sdata, BSS_CHANGED_BEACON);
469
470         mod_timer(&ifmsh->housekeeping_timer,
471                   round_jiffies(jiffies + IEEE80211_MESH_HOUSEKEEPING_INTERVAL));
472 }
473
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
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);
497         if (del_timer_sync(&ifmsh->mesh_path_root_timer))
498                 set_bit(TMR_RUNNING_MPR, &ifmsh->timers_running);
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);
509         if (test_and_clear_bit(TMR_RUNNING_MPR, &ifmsh->timers_running))
510                 add_timer(&ifmsh->mesh_path_root_timer);
511         ieee80211_mesh_root_setup(ifmsh);
512 }
513 #endif
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
520         set_bit(MESH_WORK_HOUSEKEEPING, &ifmsh->wrkq_flags);
521         ieee80211_mesh_root_setup(ifmsh);
522         ieee80211_queue_work(&local->hw, &ifmsh->work);
523         sdata->vif.bss_conf.beacon_int = MESH_DEFAULT_BEACON_INTERVAL;
524         ieee80211_bss_info_change_notify(sdata, BSS_CHANGED_BEACON |
525                                                 BSS_CHANGED_BEACON_ENABLED |
526                                                 BSS_CHANGED_BEACON_INT);
527 }
528
529 void ieee80211_stop_mesh(struct ieee80211_sub_if_data *sdata)
530 {
531         del_timer_sync(&sdata->u.mesh.housekeeping_timer);
532         del_timer_sync(&sdata->u.mesh.mesh_path_root_timer);
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
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          */
548         rcu_barrier(); /* Wait for RX path and call_rcu()'s */
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 {
558         struct ieee80211_local *local = sdata->local;
559         struct ieee802_11_elems elems;
560         struct ieee80211_channel *channel;
561         u32 supp_rates = 0;
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 &&
568             compare_ether_addr(mgmt->da, sdata->dev->dev_addr))
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) {
603         case MESH_PLINK_CATEGORY:
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
622         rx_status = IEEE80211_SKB_RXCB(skb);
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
651         if (local->scanning)
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
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))
669                 ieee80211_mesh_housekeeping(sdata, ifmsh);
670
671         if (test_and_clear_bit(MESH_WORK_ROOT, &ifmsh->wrkq_flags))
672                 ieee80211_mesh_rootpath(sdata);
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))
682                         ieee80211_queue_work(&local->hw, &sdata->u.mesh.work);
683         rcu_read_unlock();
684 }
685
686 void ieee80211_mesh_init_sdata(struct ieee80211_sub_if_data *sdata)
687 {
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 =
703                 MESH_MAX_ESTAB_PLINKS;
704         ifmsh->mshcfg.dot11MeshHWMPactivePathTimeout =
705                 MESH_PATH_TIMEOUT;
706         ifmsh->mshcfg.dot11MeshHWMPpreqMinInterval =
707                 MESH_PREQ_MIN_INT;
708         ifmsh->mshcfg.dot11MeshHWMPnetDiameterTraversalTime =
709                 MESH_DIAM_TRAVERSAL_TIME;
710         ifmsh->mshcfg.dot11MeshHWMPmaxPREQretries =
711                 MESH_MAX_PREQ_RETRIES;
712         ifmsh->mshcfg.path_refresh_time =
713                 MESH_PATH_REFRESH_TIME;
714         ifmsh->mshcfg.min_discovery_timeout =
715                 MESH_MIN_DISCOVERY_TIMEOUT;
716         ifmsh->accepting_plinks = true;
717         ifmsh->preq_id = 0;
718         ifmsh->sn = 0;
719         atomic_set(&ifmsh->mpaths, 0);
720         mesh_rmc_init(sdata);
721         ifmsh->last_preq = jiffies;
722         /* Allocate all mesh structures when creating the first mesh interface. */
723         if (!mesh_allocated)
724                 ieee80211s_init();
725         mesh_ids_set_default(ifmsh);
726         setup_timer(&ifmsh->mesh_path_timer,
727                     ieee80211_mesh_path_timer,
728                     (unsigned long) sdata);
729         setup_timer(&ifmsh->mesh_path_root_timer,
730                     ieee80211_mesh_path_root_timer,
731                     (unsigned long) sdata);
732         INIT_LIST_HEAD(&ifmsh->preq_queue.list);
733         spin_lock_init(&ifmsh->mesh_preq_queue_lock);
734 }
735
736 ieee80211_rx_result
737 ieee80211_mesh_rx_mgmt(struct ieee80211_sub_if_data *sdata, struct sk_buff *skb)
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) {
751         case IEEE80211_STYPE_ACTION:
752                 if (skb->len < IEEE80211_MIN_ACTION_SIZE)
753                         return RX_DROP_MONITOR;
754                 /* fall through */
755         case IEEE80211_STYPE_PROBE_RESP:
756         case IEEE80211_STYPE_BEACON:
757                 skb_queue_tail(&ifmsh->skb_queue, skb);
758                 ieee80211_queue_work(&local->hw, &ifmsh->work);
759                 return RX_QUEUED;
760         }
761
762         return RX_CONTINUE;
763 }