0f3e1147ec4f2b5a640f69df4a71d2766e1d2187
[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 MESHCONF_PP_OFFSET      0               /* Path Selection Protocol */
19 #define MESHCONF_PM_OFFSET      1               /* Path Selection Metric   */
20 #define MESHCONF_CC_OFFSET      2               /* Congestion Control Mode */
21 #define MESHCONF_SP_OFFSET      3               /* Synchronization Protocol */
22 #define MESHCONF_AUTH_OFFSET    4               /* Authentication Protocol */
23 #define MESHCONF_CAPAB_OFFSET   6
24 #define MESHCONF_CAPAB_ACCEPT_PLINKS 0x01
25 #define MESHCONF_CAPAB_FORWARDING    0x08
26
27 #define TMR_RUNNING_HK  0
28 #define TMR_RUNNING_MP  1
29
30 int mesh_allocated;
31 static struct kmem_cache *rm_cache;
32
33 void ieee80211s_init(void)
34 {
35         mesh_pathtbl_init();
36         mesh_allocated = 1;
37         rm_cache = kmem_cache_create("mesh_rmc", sizeof(struct rmc_entry),
38                                      0, 0, NULL);
39 }
40
41 void ieee80211s_stop(void)
42 {
43         mesh_pathtbl_unregister();
44         kmem_cache_destroy(rm_cache);
45 }
46
47 static void ieee80211_mesh_housekeeping_timer(unsigned long data)
48 {
49         struct ieee80211_sub_if_data *sdata = (void *) data;
50         struct ieee80211_local *local = sdata->local;
51         struct ieee80211_if_mesh *ifmsh = &sdata->u.mesh;
52
53         set_bit(MESH_WORK_HOUSEKEEPING, &ifmsh->wrkq_flags);
54
55         if (local->quiescing) {
56                 set_bit(TMR_RUNNING_HK, &ifmsh->timers_running);
57                 return;
58         }
59
60         ieee80211_queue_work(&local->hw, &ifmsh->work);
61 }
62
63 /**
64  * mesh_matches_local - check if the config of a mesh point matches ours
65  *
66  * @ie: information elements of a management frame from the mesh peer
67  * @sdata: local mesh subif
68  *
69  * This function checks if the mesh configuration of a mesh point matches the
70  * local mesh configuration, i.e. if both nodes belong to the same mesh network.
71  */
72 bool mesh_matches_local(struct ieee802_11_elems *ie, struct ieee80211_sub_if_data *sdata)
73 {
74         struct ieee80211_if_mesh *ifmsh = &sdata->u.mesh;
75
76         /*
77          * As support for each feature is added, check for matching
78          * - On mesh config capabilities
79          *   - Power Save Support En
80          *   - Sync support enabled
81          *   - Sync support active
82          *   - Sync support required from peer
83          *   - MDA enabled
84          * - Power management control on fc
85          */
86         if (ifmsh->mesh_id_len == ie->mesh_id_len &&
87                 memcmp(ifmsh->mesh_id, ie->mesh_id, ie->mesh_id_len) == 0 &&
88                 (ifmsh->mesh_pp_id == *(ie->mesh_config + MESHCONF_PP_OFFSET))&&
89                 (ifmsh->mesh_pm_id == *(ie->mesh_config + MESHCONF_PM_OFFSET))&&
90                 (ifmsh->mesh_cc_id == *(ie->mesh_config + MESHCONF_CC_OFFSET))&&
91                 (ifmsh->mesh_sp_id == *(ie->mesh_config + MESHCONF_SP_OFFSET))&&
92                 (ifmsh->mesh_auth_id == *(ie->mesh_config +
93                     MESHCONF_AUTH_OFFSET)))
94                 return true;
95
96         return false;
97 }
98
99 /**
100  * mesh_peer_accepts_plinks - check if an mp is willing to establish peer links
101  *
102  * @ie: information elements of a management frame from the mesh peer
103  */
104 bool mesh_peer_accepts_plinks(struct ieee802_11_elems *ie)
105 {
106         return (*(ie->mesh_config + MESHCONF_CAPAB_OFFSET) &
107             MESHCONF_CAPAB_ACCEPT_PLINKS) != 0;
108 }
109
110 /**
111  * mesh_accept_plinks_update: update accepting_plink in local mesh beacons
112  *
113  * @sdata: mesh interface in which mesh beacons are going to be updated
114  */
115 void mesh_accept_plinks_update(struct ieee80211_sub_if_data *sdata)
116 {
117         bool free_plinks;
118
119         /* In case mesh_plink_free_count > 0 and mesh_plinktbl_capacity == 0,
120          * the mesh interface might be able to establish plinks with peers that
121          * are already on the table but are not on PLINK_ESTAB state. However,
122          * in general the mesh interface is not accepting peer link requests
123          * from new peers, and that must be reflected in the beacon
124          */
125         free_plinks = mesh_plink_availables(sdata);
126
127         if (free_plinks != sdata->u.mesh.accepting_plinks)
128                 ieee80211_mesh_housekeeping_timer((unsigned long) sdata);
129 }
130
131 void mesh_ids_set_default(struct ieee80211_if_mesh *sta)
132 {
133         sta->mesh_pp_id = 0;    /* HWMP */
134         sta->mesh_pm_id = 0;    /* Airtime */
135         sta->mesh_cc_id = 0;    /* Disabled */
136         sta->mesh_sp_id = 0;    /* Neighbor Offset */
137         sta->mesh_auth_id = 0;  /* Disabled */
138 }
139
140 int mesh_rmc_init(struct ieee80211_sub_if_data *sdata)
141 {
142         int i;
143
144         sdata->u.mesh.rmc = kmalloc(sizeof(struct mesh_rmc), GFP_KERNEL);
145         if (!sdata->u.mesh.rmc)
146                 return -ENOMEM;
147         sdata->u.mesh.rmc->idx_mask = RMC_BUCKETS - 1;
148         for (i = 0; i < RMC_BUCKETS; i++)
149                 INIT_LIST_HEAD(&sdata->u.mesh.rmc->bucket[i].list);
150         return 0;
151 }
152
153 void mesh_rmc_free(struct ieee80211_sub_if_data *sdata)
154 {
155         struct mesh_rmc *rmc = sdata->u.mesh.rmc;
156         struct rmc_entry *p, *n;
157         int i;
158
159         if (!sdata->u.mesh.rmc)
160                 return;
161
162         for (i = 0; i < RMC_BUCKETS; i++)
163                 list_for_each_entry_safe(p, n, &rmc->bucket[i].list, list) {
164                         list_del(&p->list);
165                         kmem_cache_free(rm_cache, p);
166                 }
167
168         kfree(rmc);
169         sdata->u.mesh.rmc = NULL;
170 }
171
172 /**
173  * mesh_rmc_check - Check frame in recent multicast cache and add if absent.
174  *
175  * @sa:         source address
176  * @mesh_hdr:   mesh_header
177  *
178  * Returns: 0 if the frame is not in the cache, nonzero otherwise.
179  *
180  * Checks using the source address and the mesh sequence number if we have
181  * received this frame lately. If the frame is not in the cache, it is added to
182  * it.
183  */
184 int mesh_rmc_check(u8 *sa, struct ieee80211s_hdr *mesh_hdr,
185                    struct ieee80211_sub_if_data *sdata)
186 {
187         struct mesh_rmc *rmc = sdata->u.mesh.rmc;
188         u32 seqnum = 0;
189         int entries = 0;
190         u8 idx;
191         struct rmc_entry *p, *n;
192
193         /* Don't care about endianness since only match matters */
194         memcpy(&seqnum, &mesh_hdr->seqnum, sizeof(mesh_hdr->seqnum));
195         idx = le32_to_cpu(mesh_hdr->seqnum) & rmc->idx_mask;
196         list_for_each_entry_safe(p, n, &rmc->bucket[idx].list, list) {
197                 ++entries;
198                 if (time_after(jiffies, p->exp_time) ||
199                                 (entries == RMC_QUEUE_MAX_LEN)) {
200                         list_del(&p->list);
201                         kmem_cache_free(rm_cache, p);
202                         --entries;
203                 } else if ((seqnum == p->seqnum)
204                                 && (memcmp(sa, p->sa, ETH_ALEN) == 0))
205                         return -1;
206         }
207
208         p = kmem_cache_alloc(rm_cache, GFP_ATOMIC);
209         if (!p) {
210                 printk(KERN_DEBUG "o11s: could not allocate RMC entry\n");
211                 return 0;
212         }
213         p->seqnum = seqnum;
214         p->exp_time = jiffies + RMC_TIMEOUT;
215         memcpy(p->sa, sa, ETH_ALEN);
216         list_add(&p->list, &rmc->bucket[idx].list);
217         return 0;
218 }
219
220 void mesh_mgmt_ies_add(struct sk_buff *skb, struct ieee80211_sub_if_data *sdata)
221 {
222         struct ieee80211_local *local = sdata->local;
223         struct ieee80211_supported_band *sband;
224         u8 *pos;
225         int len, i, rate;
226         u8 neighbors;
227
228         sband = local->hw.wiphy->bands[local->hw.conf.channel->band];
229         len = sband->n_bitrates;
230         if (len > 8)
231                 len = 8;
232         pos = skb_put(skb, len + 2);
233         *pos++ = WLAN_EID_SUPP_RATES;
234         *pos++ = len;
235         for (i = 0; i < len; i++) {
236                 rate = sband->bitrates[i].bitrate;
237                 *pos++ = (u8) (rate / 5);
238         }
239
240         if (sband->n_bitrates > len) {
241                 pos = skb_put(skb, sband->n_bitrates - len + 2);
242                 *pos++ = WLAN_EID_EXT_SUPP_RATES;
243                 *pos++ = sband->n_bitrates - len;
244                 for (i = len; i < sband->n_bitrates; i++) {
245                         rate = sband->bitrates[i].bitrate;
246                         *pos++ = (u8) (rate / 5);
247                 }
248         }
249
250         if (sband->band == IEEE80211_BAND_2GHZ) {
251                 pos = skb_put(skb, 2 + 1);
252                 *pos++ = WLAN_EID_DS_PARAMS;
253                 *pos++ = 1;
254                 *pos++ = ieee80211_frequency_to_channel(local->hw.conf.channel->center_freq);
255         }
256
257         pos = skb_put(skb, 2 + sdata->u.mesh.mesh_id_len);
258         *pos++ = WLAN_EID_MESH_ID;
259         *pos++ = sdata->u.mesh.mesh_id_len;
260         if (sdata->u.mesh.mesh_id_len)
261                 memcpy(pos, sdata->u.mesh.mesh_id, sdata->u.mesh.mesh_id_len);
262
263         pos = skb_put(skb, 2 + IEEE80211_MESH_CONFIG_LEN);
264         *pos++ = WLAN_EID_MESH_CONFIG;
265         *pos++ = IEEE80211_MESH_CONFIG_LEN;
266
267         /* Active path selection protocol ID */
268         *pos++ = sdata->u.mesh.mesh_pp_id;
269
270         /* Active path selection metric ID   */
271         *pos++ = sdata->u.mesh.mesh_pm_id;
272
273         /* Congestion control mode identifier */
274         *pos++ = sdata->u.mesh.mesh_cc_id;
275
276         /* Synchronization protocol identifier */
277         *pos++ = sdata->u.mesh.mesh_sp_id;
278
279         /* Authentication Protocol identifier */
280         *pos++ = sdata->u.mesh.mesh_auth_id;
281
282         /* Mesh Formation Info - number of neighbors */
283         neighbors = atomic_read(&sdata->u.mesh.mshstats.estab_plinks);
284         /* Number of neighbor mesh STAs or 15 whichever is smaller */
285         neighbors = (neighbors > 15) ? 15 : neighbors;
286         *pos++ = neighbors << 1;
287
288         /* Mesh capability */
289         sdata->u.mesh.accepting_plinks = mesh_plink_availables(sdata);
290         *pos = MESHCONF_CAPAB_FORWARDING;
291         *pos++ |= sdata->u.mesh.accepting_plinks ?
292             MESHCONF_CAPAB_ACCEPT_PLINKS : 0x00;
293         *pos++ = 0x00;
294
295         return;
296 }
297
298 u32 mesh_table_hash(u8 *addr, struct ieee80211_sub_if_data *sdata, struct mesh_table *tbl)
299 {
300         /* Use last four bytes of hw addr and interface index as hash index */
301         return jhash_2words(*(u32 *)(addr+2), sdata->dev->ifindex, tbl->hash_rnd)
302                 & tbl->hash_mask;
303 }
304
305 struct mesh_table *mesh_table_alloc(int size_order)
306 {
307         int i;
308         struct mesh_table *newtbl;
309
310         newtbl = kmalloc(sizeof(struct mesh_table), GFP_KERNEL);
311         if (!newtbl)
312                 return NULL;
313
314         newtbl->hash_buckets = kzalloc(sizeof(struct hlist_head) *
315                         (1 << size_order), GFP_KERNEL);
316
317         if (!newtbl->hash_buckets) {
318                 kfree(newtbl);
319                 return NULL;
320         }
321
322         newtbl->hashwlock = kmalloc(sizeof(spinlock_t) *
323                         (1 << size_order), GFP_KERNEL);
324         if (!newtbl->hashwlock) {
325                 kfree(newtbl->hash_buckets);
326                 kfree(newtbl);
327                 return NULL;
328         }
329
330         newtbl->size_order = size_order;
331         newtbl->hash_mask = (1 << size_order) - 1;
332         atomic_set(&newtbl->entries,  0);
333         get_random_bytes(&newtbl->hash_rnd,
334                         sizeof(newtbl->hash_rnd));
335         for (i = 0; i <= newtbl->hash_mask; i++)
336                 spin_lock_init(&newtbl->hashwlock[i]);
337
338         return newtbl;
339 }
340
341
342 static void ieee80211_mesh_path_timer(unsigned long data)
343 {
344         struct ieee80211_sub_if_data *sdata =
345                 (struct ieee80211_sub_if_data *) data;
346         struct ieee80211_if_mesh *ifmsh = &sdata->u.mesh;
347         struct ieee80211_local *local = sdata->local;
348
349         if (local->quiescing) {
350                 set_bit(TMR_RUNNING_MP, &ifmsh->timers_running);
351                 return;
352         }
353
354         ieee80211_queue_work(&local->hw, &ifmsh->work);
355 }
356
357 /**
358  * ieee80211_fill_mesh_addresses - fill addresses of a locally originated mesh frame
359  * @hdr:        802.11 frame header
360  * @fc:         frame control field
361  * @meshda:     destination address in the mesh
362  * @meshsa:     source address address in the mesh.  Same as TA, as frame is
363  *              locally originated.
364  *
365  * Return the length of the 802.11 (does not include a mesh control header)
366  */
367 int ieee80211_fill_mesh_addresses(struct ieee80211_hdr *hdr, __le16 *fc, char
368                 *meshda, char *meshsa) {
369         if (is_multicast_ether_addr(meshda)) {
370                 *fc |= cpu_to_le16(IEEE80211_FCTL_FROMDS);
371                 /* DA TA SA */
372                 memcpy(hdr->addr1, meshda, ETH_ALEN);
373                 memcpy(hdr->addr2, meshsa, ETH_ALEN);
374                 memcpy(hdr->addr3, meshsa, ETH_ALEN);
375                 return 24;
376         } else {
377                 *fc |= cpu_to_le16(IEEE80211_FCTL_FROMDS |
378                                 IEEE80211_FCTL_TODS);
379                 /* RA TA DA SA */
380                 memset(hdr->addr1, 0, ETH_ALEN);   /* RA is resolved later */
381                 memcpy(hdr->addr2, meshsa, ETH_ALEN);
382                 memcpy(hdr->addr3, meshda, ETH_ALEN);
383                 memcpy(hdr->addr4, meshsa, ETH_ALEN);
384                 return 30;
385         }
386 }
387
388 /**
389  * ieee80211_new_mesh_header - create a new mesh header
390  * @meshhdr:    uninitialized mesh header
391  * @sdata:      mesh interface to be used
392  * @addr4:      addr4 of the mesh frame (1st in ae header)
393  *              may be NULL
394  * @addr5:      addr5 of the mesh frame (1st or 2nd in ae header)
395  *              may be NULL unless addr6 is present
396  * @addr6:      addr6 of the mesh frame (2nd or 3rd in ae header)
397  *              may be NULL unless addr5 is present
398  *
399  * Return the header length.
400  */
401 int ieee80211_new_mesh_header(struct ieee80211s_hdr *meshhdr,
402                 struct ieee80211_sub_if_data *sdata, char *addr4,
403                 char *addr5, char *addr6)
404 {
405         int aelen = 0;
406         memset(meshhdr, 0, sizeof(meshhdr));
407         meshhdr->ttl = sdata->u.mesh.mshcfg.dot11MeshTTL;
408         put_unaligned(cpu_to_le32(sdata->u.mesh.mesh_seqnum), &meshhdr->seqnum);
409         sdata->u.mesh.mesh_seqnum++;
410         if (addr4) {
411                 meshhdr->flags |= MESH_FLAGS_AE_A4;
412                 aelen += ETH_ALEN;
413                 memcpy(meshhdr->eaddr1, addr4, ETH_ALEN);
414         }
415         if (addr5 && addr6) {
416                 meshhdr->flags |= MESH_FLAGS_AE_A5_A6;
417                 aelen += 2 * ETH_ALEN;
418                 if (!addr4) {
419                         memcpy(meshhdr->eaddr1, addr5, ETH_ALEN);
420                         memcpy(meshhdr->eaddr2, addr6, ETH_ALEN);
421                 } else {
422                         memcpy(meshhdr->eaddr2, addr5, ETH_ALEN);
423                         memcpy(meshhdr->eaddr3, addr6, ETH_ALEN);
424                 }
425         }
426         return 6 + aelen;
427 }
428
429 static void ieee80211_mesh_housekeeping(struct ieee80211_sub_if_data *sdata,
430                            struct ieee80211_if_mesh *ifmsh)
431 {
432         bool free_plinks;
433
434 #ifdef CONFIG_MAC80211_VERBOSE_DEBUG
435         printk(KERN_DEBUG "%s: running mesh housekeeping\n",
436                sdata->dev->name);
437 #endif
438
439         ieee80211_sta_expire(sdata, IEEE80211_MESH_PEER_INACTIVITY_LIMIT);
440         mesh_path_expire(sdata);
441
442         free_plinks = mesh_plink_availables(sdata);
443         if (free_plinks != sdata->u.mesh.accepting_plinks)
444                 ieee80211_bss_info_change_notify(sdata, BSS_CHANGED_BEACON);
445
446         mod_timer(&ifmsh->housekeeping_timer,
447                   round_jiffies(jiffies + IEEE80211_MESH_HOUSEKEEPING_INTERVAL));
448 }
449
450 #ifdef CONFIG_PM
451 void ieee80211_mesh_quiesce(struct ieee80211_sub_if_data *sdata)
452 {
453         struct ieee80211_if_mesh *ifmsh = &sdata->u.mesh;
454
455         /* might restart the timer but that doesn't matter */
456         cancel_work_sync(&ifmsh->work);
457
458         /* use atomic bitops in case both timers fire at the same time */
459
460         if (del_timer_sync(&ifmsh->housekeeping_timer))
461                 set_bit(TMR_RUNNING_HK, &ifmsh->timers_running);
462         if (del_timer_sync(&ifmsh->mesh_path_timer))
463                 set_bit(TMR_RUNNING_MP, &ifmsh->timers_running);
464 }
465
466 void ieee80211_mesh_restart(struct ieee80211_sub_if_data *sdata)
467 {
468         struct ieee80211_if_mesh *ifmsh = &sdata->u.mesh;
469
470         if (test_and_clear_bit(TMR_RUNNING_HK, &ifmsh->timers_running))
471                 add_timer(&ifmsh->housekeeping_timer);
472         if (test_and_clear_bit(TMR_RUNNING_MP, &ifmsh->timers_running))
473                 add_timer(&ifmsh->mesh_path_timer);
474 }
475 #endif
476
477 void ieee80211_start_mesh(struct ieee80211_sub_if_data *sdata)
478 {
479         struct ieee80211_if_mesh *ifmsh = &sdata->u.mesh;
480         struct ieee80211_local *local = sdata->local;
481
482         set_bit(MESH_WORK_HOUSEKEEPING, &ifmsh->wrkq_flags);
483         ieee80211_queue_work(&local->hw, &ifmsh->work);
484         sdata->vif.bss_conf.beacon_int = MESH_DEFAULT_BEACON_INTERVAL;
485         ieee80211_bss_info_change_notify(sdata, BSS_CHANGED_BEACON |
486                                                 BSS_CHANGED_BEACON_ENABLED |
487                                                 BSS_CHANGED_BEACON_INT);
488 }
489
490 void ieee80211_stop_mesh(struct ieee80211_sub_if_data *sdata)
491 {
492         del_timer_sync(&sdata->u.mesh.housekeeping_timer);
493         /*
494          * If the timer fired while we waited for it, it will have
495          * requeued the work. Now the work will be running again
496          * but will not rearm the timer again because it checks
497          * whether the interface is running, which, at this point,
498          * it no longer is.
499          */
500         cancel_work_sync(&sdata->u.mesh.work);
501
502         /*
503          * When we get here, the interface is marked down.
504          * Call synchronize_rcu() to wait for the RX path
505          * should it be using the interface and enqueuing
506          * frames at this very time on another CPU.
507          */
508         rcu_barrier(); /* Wait for RX path and call_rcu()'s */
509         skb_queue_purge(&sdata->u.mesh.skb_queue);
510 }
511
512 static void ieee80211_mesh_rx_bcn_presp(struct ieee80211_sub_if_data *sdata,
513                                         u16 stype,
514                                         struct ieee80211_mgmt *mgmt,
515                                         size_t len,
516                                         struct ieee80211_rx_status *rx_status)
517 {
518         struct ieee80211_local *local = sdata->local;
519         struct ieee802_11_elems elems;
520         struct ieee80211_channel *channel;
521         u32 supp_rates = 0;
522         size_t baselen;
523         int freq;
524         enum ieee80211_band band = rx_status->band;
525
526         /* ignore ProbeResp to foreign address */
527         if (stype == IEEE80211_STYPE_PROBE_RESP &&
528             compare_ether_addr(mgmt->da, sdata->dev->dev_addr))
529                 return;
530
531         baselen = (u8 *) mgmt->u.probe_resp.variable - (u8 *) mgmt;
532         if (baselen > len)
533                 return;
534
535         ieee802_11_parse_elems(mgmt->u.probe_resp.variable, len - baselen,
536                                &elems);
537
538         if (elems.ds_params && elems.ds_params_len == 1)
539                 freq = ieee80211_channel_to_frequency(elems.ds_params[0]);
540         else
541                 freq = rx_status->freq;
542
543         channel = ieee80211_get_channel(local->hw.wiphy, freq);
544
545         if (!channel || channel->flags & IEEE80211_CHAN_DISABLED)
546                 return;
547
548         if (elems.mesh_id && elems.mesh_config &&
549             mesh_matches_local(&elems, sdata)) {
550                 supp_rates = ieee80211_sta_get_rates(local, &elems, band);
551
552                 mesh_neighbour_update(mgmt->sa, supp_rates, sdata,
553                                       mesh_peer_accepts_plinks(&elems));
554         }
555 }
556
557 static void ieee80211_mesh_rx_mgmt_action(struct ieee80211_sub_if_data *sdata,
558                                           struct ieee80211_mgmt *mgmt,
559                                           size_t len,
560                                           struct ieee80211_rx_status *rx_status)
561 {
562         switch (mgmt->u.action.category) {
563         case MESH_PLINK_CATEGORY:
564                 mesh_rx_plink_frame(sdata, mgmt, len, rx_status);
565                 break;
566         case MESH_PATH_SEL_CATEGORY:
567                 mesh_rx_path_sel_frame(sdata, mgmt, len);
568                 break;
569         }
570 }
571
572 static void ieee80211_mesh_rx_queued_mgmt(struct ieee80211_sub_if_data *sdata,
573                                           struct sk_buff *skb)
574 {
575         struct ieee80211_rx_status *rx_status;
576         struct ieee80211_if_mesh *ifmsh;
577         struct ieee80211_mgmt *mgmt;
578         u16 stype;
579
580         ifmsh = &sdata->u.mesh;
581
582         rx_status = IEEE80211_SKB_RXCB(skb);
583         mgmt = (struct ieee80211_mgmt *) skb->data;
584         stype = le16_to_cpu(mgmt->frame_control) & IEEE80211_FCTL_STYPE;
585
586         switch (stype) {
587         case IEEE80211_STYPE_PROBE_RESP:
588         case IEEE80211_STYPE_BEACON:
589                 ieee80211_mesh_rx_bcn_presp(sdata, stype, mgmt, skb->len,
590                                             rx_status);
591                 break;
592         case IEEE80211_STYPE_ACTION:
593                 ieee80211_mesh_rx_mgmt_action(sdata, mgmt, skb->len, rx_status);
594                 break;
595         }
596
597         kfree_skb(skb);
598 }
599
600 static void ieee80211_mesh_work(struct work_struct *work)
601 {
602         struct ieee80211_sub_if_data *sdata =
603                 container_of(work, struct ieee80211_sub_if_data, u.mesh.work);
604         struct ieee80211_local *local = sdata->local;
605         struct ieee80211_if_mesh *ifmsh = &sdata->u.mesh;
606         struct sk_buff *skb;
607
608         if (!netif_running(sdata->dev))
609                 return;
610
611         if (local->scanning)
612                 return;
613
614         while ((skb = skb_dequeue(&ifmsh->skb_queue)))
615                 ieee80211_mesh_rx_queued_mgmt(sdata, skb);
616
617         if (ifmsh->preq_queue_len &&
618             time_after(jiffies,
619                        ifmsh->last_preq + msecs_to_jiffies(ifmsh->mshcfg.dot11MeshHWMPpreqMinInterval)))
620                 mesh_path_start_discovery(sdata);
621
622         if (test_and_clear_bit(MESH_WORK_GROW_MPATH_TABLE, &ifmsh->wrkq_flags))
623                 mesh_mpath_table_grow();
624
625         if (test_and_clear_bit(MESH_WORK_GROW_MPATH_TABLE, &ifmsh->wrkq_flags))
626                 mesh_mpp_table_grow();
627
628         if (test_and_clear_bit(MESH_WORK_HOUSEKEEPING, &ifmsh->wrkq_flags))
629                 ieee80211_mesh_housekeeping(sdata, ifmsh);
630 }
631
632 void ieee80211_mesh_notify_scan_completed(struct ieee80211_local *local)
633 {
634         struct ieee80211_sub_if_data *sdata;
635
636         rcu_read_lock();
637         list_for_each_entry_rcu(sdata, &local->interfaces, list)
638                 if (ieee80211_vif_is_mesh(&sdata->vif))
639                         ieee80211_queue_work(&local->hw, &sdata->u.mesh.work);
640         rcu_read_unlock();
641 }
642
643 void ieee80211_mesh_init_sdata(struct ieee80211_sub_if_data *sdata)
644 {
645         struct ieee80211_if_mesh *ifmsh = &sdata->u.mesh;
646
647         INIT_WORK(&ifmsh->work, ieee80211_mesh_work);
648         setup_timer(&ifmsh->housekeeping_timer,
649                     ieee80211_mesh_housekeeping_timer,
650                     (unsigned long) sdata);
651         skb_queue_head_init(&sdata->u.mesh.skb_queue);
652
653         ifmsh->mshcfg.dot11MeshRetryTimeout = MESH_RET_T;
654         ifmsh->mshcfg.dot11MeshConfirmTimeout = MESH_CONF_T;
655         ifmsh->mshcfg.dot11MeshHoldingTimeout = MESH_HOLD_T;
656         ifmsh->mshcfg.dot11MeshMaxRetries = MESH_MAX_RETR;
657         ifmsh->mshcfg.dot11MeshTTL = MESH_TTL;
658         ifmsh->mshcfg.auto_open_plinks = true;
659         ifmsh->mshcfg.dot11MeshMaxPeerLinks =
660                 MESH_MAX_ESTAB_PLINKS;
661         ifmsh->mshcfg.dot11MeshHWMPactivePathTimeout =
662                 MESH_PATH_TIMEOUT;
663         ifmsh->mshcfg.dot11MeshHWMPpreqMinInterval =
664                 MESH_PREQ_MIN_INT;
665         ifmsh->mshcfg.dot11MeshHWMPnetDiameterTraversalTime =
666                 MESH_DIAM_TRAVERSAL_TIME;
667         ifmsh->mshcfg.dot11MeshHWMPmaxPREQretries =
668                 MESH_MAX_PREQ_RETRIES;
669         ifmsh->mshcfg.path_refresh_time =
670                 MESH_PATH_REFRESH_TIME;
671         ifmsh->mshcfg.min_discovery_timeout =
672                 MESH_MIN_DISCOVERY_TIMEOUT;
673         ifmsh->accepting_plinks = true;
674         ifmsh->preq_id = 0;
675         ifmsh->sn = 0;
676         atomic_set(&ifmsh->mpaths, 0);
677         mesh_rmc_init(sdata);
678         ifmsh->last_preq = jiffies;
679         /* Allocate all mesh structures when creating the first mesh interface. */
680         if (!mesh_allocated)
681                 ieee80211s_init();
682         mesh_ids_set_default(ifmsh);
683         setup_timer(&ifmsh->mesh_path_timer,
684                     ieee80211_mesh_path_timer,
685                     (unsigned long) sdata);
686         INIT_LIST_HEAD(&ifmsh->preq_queue.list);
687         spin_lock_init(&ifmsh->mesh_preq_queue_lock);
688 }
689
690 ieee80211_rx_result
691 ieee80211_mesh_rx_mgmt(struct ieee80211_sub_if_data *sdata, struct sk_buff *skb)
692 {
693         struct ieee80211_local *local = sdata->local;
694         struct ieee80211_if_mesh *ifmsh = &sdata->u.mesh;
695         struct ieee80211_mgmt *mgmt;
696         u16 fc;
697
698         if (skb->len < 24)
699                 return RX_DROP_MONITOR;
700
701         mgmt = (struct ieee80211_mgmt *) skb->data;
702         fc = le16_to_cpu(mgmt->frame_control);
703
704         switch (fc & IEEE80211_FCTL_STYPE) {
705         case IEEE80211_STYPE_ACTION:
706                 if (skb->len < IEEE80211_MIN_ACTION_SIZE)
707                         return RX_DROP_MONITOR;
708                 /* fall through */
709         case IEEE80211_STYPE_PROBE_RESP:
710         case IEEE80211_STYPE_BEACON:
711                 skb_queue_tail(&ifmsh->skb_queue, skb);
712                 ieee80211_queue_work(&local->hw, &ifmsh->work);
713                 return RX_QUEUED;
714         }
715
716         return RX_CONTINUE;
717 }