mac80211: update peer link management IE and action frames
[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         pos = skb_put(skb, 2 + sdata->u.mesh.mesh_id_len);
251         *pos++ = WLAN_EID_MESH_ID;
252         *pos++ = sdata->u.mesh.mesh_id_len;
253         if (sdata->u.mesh.mesh_id_len)
254                 memcpy(pos, sdata->u.mesh.mesh_id, sdata->u.mesh.mesh_id_len);
255
256         pos = skb_put(skb, 2 + IEEE80211_MESH_CONFIG_LEN);
257         *pos++ = WLAN_EID_MESH_CONFIG;
258         *pos++ = IEEE80211_MESH_CONFIG_LEN;
259
260         /* Active path selection protocol ID */
261         *pos++ = sdata->u.mesh.mesh_pp_id;
262
263         /* Active path selection metric ID   */
264         *pos++ = sdata->u.mesh.mesh_pm_id;
265
266         /* Congestion control mode identifier */
267         *pos++ = sdata->u.mesh.mesh_cc_id;
268
269         /* Synchronization protocol identifier */
270         *pos++ = sdata->u.mesh.mesh_sp_id;
271
272         /* Authentication Protocol identifier */
273         *pos++ = sdata->u.mesh.mesh_auth_id;
274
275         /* Mesh Formation Info - number of neighbors */
276         neighbors = atomic_read(&sdata->u.mesh.mshstats.estab_plinks);
277         /* Number of neighbor mesh STAs or 15 whichever is smaller */
278         neighbors = (neighbors > 15) ? 15 : neighbors;
279         *pos++ = neighbors << 1;
280
281         /* Mesh capability */
282         sdata->u.mesh.accepting_plinks = mesh_plink_availables(sdata);
283         *pos = MESHCONF_CAPAB_FORWARDING;
284         *pos++ |= sdata->u.mesh.accepting_plinks ?
285             MESHCONF_CAPAB_ACCEPT_PLINKS : 0x00;
286         *pos++ = 0x00;
287
288         return;
289 }
290
291 u32 mesh_table_hash(u8 *addr, struct ieee80211_sub_if_data *sdata, struct mesh_table *tbl)
292 {
293         /* Use last four bytes of hw addr and interface index as hash index */
294         return jhash_2words(*(u32 *)(addr+2), sdata->dev->ifindex, tbl->hash_rnd)
295                 & tbl->hash_mask;
296 }
297
298 struct mesh_table *mesh_table_alloc(int size_order)
299 {
300         int i;
301         struct mesh_table *newtbl;
302
303         newtbl = kmalloc(sizeof(struct mesh_table), GFP_KERNEL);
304         if (!newtbl)
305                 return NULL;
306
307         newtbl->hash_buckets = kzalloc(sizeof(struct hlist_head) *
308                         (1 << size_order), GFP_KERNEL);
309
310         if (!newtbl->hash_buckets) {
311                 kfree(newtbl);
312                 return NULL;
313         }
314
315         newtbl->hashwlock = kmalloc(sizeof(spinlock_t) *
316                         (1 << size_order), GFP_KERNEL);
317         if (!newtbl->hashwlock) {
318                 kfree(newtbl->hash_buckets);
319                 kfree(newtbl);
320                 return NULL;
321         }
322
323         newtbl->size_order = size_order;
324         newtbl->hash_mask = (1 << size_order) - 1;
325         atomic_set(&newtbl->entries,  0);
326         get_random_bytes(&newtbl->hash_rnd,
327                         sizeof(newtbl->hash_rnd));
328         for (i = 0; i <= newtbl->hash_mask; i++)
329                 spin_lock_init(&newtbl->hashwlock[i]);
330
331         return newtbl;
332 }
333
334
335 static void ieee80211_mesh_path_timer(unsigned long data)
336 {
337         struct ieee80211_sub_if_data *sdata =
338                 (struct ieee80211_sub_if_data *) data;
339         struct ieee80211_if_mesh *ifmsh = &sdata->u.mesh;
340         struct ieee80211_local *local = sdata->local;
341
342         if (local->quiescing) {
343                 set_bit(TMR_RUNNING_MP, &ifmsh->timers_running);
344                 return;
345         }
346
347         ieee80211_queue_work(&local->hw, &ifmsh->work);
348 }
349
350 /**
351  * ieee80211_fill_mesh_addresses - fill addresses of a locally originated mesh frame
352  * @hdr:        802.11 frame header
353  * @fc:         frame control field
354  * @meshda:     destination address in the mesh
355  * @meshsa:     source address address in the mesh.  Same as TA, as frame is
356  *              locally originated.
357  *
358  * Return the length of the 802.11 (does not include a mesh control header)
359  */
360 int ieee80211_fill_mesh_addresses(struct ieee80211_hdr *hdr, __le16 *fc, char
361                 *meshda, char *meshsa) {
362         if (is_multicast_ether_addr(meshda)) {
363                 *fc |= cpu_to_le16(IEEE80211_FCTL_FROMDS);
364                 /* DA TA SA */
365                 memcpy(hdr->addr1, meshda, ETH_ALEN);
366                 memcpy(hdr->addr2, meshsa, ETH_ALEN);
367                 memcpy(hdr->addr3, meshsa, ETH_ALEN);
368                 return 24;
369         } else {
370                 *fc |= cpu_to_le16(IEEE80211_FCTL_FROMDS |
371                                 IEEE80211_FCTL_TODS);
372                 /* RA TA DA SA */
373                 memset(hdr->addr1, 0, ETH_ALEN);   /* RA is resolved later */
374                 memcpy(hdr->addr2, meshsa, ETH_ALEN);
375                 memcpy(hdr->addr3, meshda, ETH_ALEN);
376                 memcpy(hdr->addr4, meshsa, ETH_ALEN);
377                 return 30;
378         }
379 }
380
381 /**
382  * ieee80211_new_mesh_header - create a new mesh header
383  * @meshhdr:    uninitialized mesh header
384  * @sdata:      mesh interface to be used
385  * @addr4:      addr4 of the mesh frame (1st in ae header)
386  *              may be NULL
387  * @addr5:      addr5 of the mesh frame (1st or 2nd in ae header)
388  *              may be NULL unless addr6 is present
389  * @addr6:      addr6 of the mesh frame (2nd or 3rd in ae header)
390  *              may be NULL unless addr5 is present
391  *
392  * Return the header length.
393  */
394 int ieee80211_new_mesh_header(struct ieee80211s_hdr *meshhdr,
395                 struct ieee80211_sub_if_data *sdata, char *addr4,
396                 char *addr5, char *addr6)
397 {
398         int aelen = 0;
399         memset(meshhdr, 0, sizeof(meshhdr));
400         meshhdr->ttl = sdata->u.mesh.mshcfg.dot11MeshTTL;
401         put_unaligned(cpu_to_le32(sdata->u.mesh.mesh_seqnum), &meshhdr->seqnum);
402         sdata->u.mesh.mesh_seqnum++;
403         if (addr4) {
404                 meshhdr->flags |= MESH_FLAGS_AE_A4;
405                 aelen += ETH_ALEN;
406                 memcpy(meshhdr->eaddr1, addr4, ETH_ALEN);
407         }
408         if (addr5 && addr6) {
409                 meshhdr->flags |= MESH_FLAGS_AE_A5_A6;
410                 aelen += 2 * ETH_ALEN;
411                 if (!addr4) {
412                         memcpy(meshhdr->eaddr1, addr5, ETH_ALEN);
413                         memcpy(meshhdr->eaddr2, addr6, ETH_ALEN);
414                 } else {
415                         memcpy(meshhdr->eaddr2, addr5, ETH_ALEN);
416                         memcpy(meshhdr->eaddr3, addr6, ETH_ALEN);
417                 }
418         }
419         return 6 + aelen;
420 }
421
422 static void ieee80211_mesh_housekeeping(struct ieee80211_sub_if_data *sdata,
423                            struct ieee80211_if_mesh *ifmsh)
424 {
425         bool free_plinks;
426
427 #ifdef CONFIG_MAC80211_VERBOSE_DEBUG
428         printk(KERN_DEBUG "%s: running mesh housekeeping\n",
429                sdata->dev->name);
430 #endif
431
432         ieee80211_sta_expire(sdata, IEEE80211_MESH_PEER_INACTIVITY_LIMIT);
433         mesh_path_expire(sdata);
434
435         free_plinks = mesh_plink_availables(sdata);
436         if (free_plinks != sdata->u.mesh.accepting_plinks)
437                 ieee80211_bss_info_change_notify(sdata, BSS_CHANGED_BEACON);
438
439         mod_timer(&ifmsh->housekeeping_timer,
440                   round_jiffies(jiffies + IEEE80211_MESH_HOUSEKEEPING_INTERVAL));
441 }
442
443 #ifdef CONFIG_PM
444 void ieee80211_mesh_quiesce(struct ieee80211_sub_if_data *sdata)
445 {
446         struct ieee80211_if_mesh *ifmsh = &sdata->u.mesh;
447
448         /* might restart the timer but that doesn't matter */
449         cancel_work_sync(&ifmsh->work);
450
451         /* use atomic bitops in case both timers fire at the same time */
452
453         if (del_timer_sync(&ifmsh->housekeeping_timer))
454                 set_bit(TMR_RUNNING_HK, &ifmsh->timers_running);
455         if (del_timer_sync(&ifmsh->mesh_path_timer))
456                 set_bit(TMR_RUNNING_MP, &ifmsh->timers_running);
457 }
458
459 void ieee80211_mesh_restart(struct ieee80211_sub_if_data *sdata)
460 {
461         struct ieee80211_if_mesh *ifmsh = &sdata->u.mesh;
462
463         if (test_and_clear_bit(TMR_RUNNING_HK, &ifmsh->timers_running))
464                 add_timer(&ifmsh->housekeeping_timer);
465         if (test_and_clear_bit(TMR_RUNNING_MP, &ifmsh->timers_running))
466                 add_timer(&ifmsh->mesh_path_timer);
467 }
468 #endif
469
470 void ieee80211_start_mesh(struct ieee80211_sub_if_data *sdata)
471 {
472         struct ieee80211_if_mesh *ifmsh = &sdata->u.mesh;
473         struct ieee80211_local *local = sdata->local;
474
475         set_bit(MESH_WORK_HOUSEKEEPING, &ifmsh->wrkq_flags);
476         ieee80211_queue_work(&local->hw, &ifmsh->work);
477         sdata->vif.bss_conf.beacon_int = MESH_DEFAULT_BEACON_INTERVAL;
478         ieee80211_bss_info_change_notify(sdata, BSS_CHANGED_BEACON |
479                                                 BSS_CHANGED_BEACON_ENABLED |
480                                                 BSS_CHANGED_BEACON_INT);
481 }
482
483 void ieee80211_stop_mesh(struct ieee80211_sub_if_data *sdata)
484 {
485         del_timer_sync(&sdata->u.mesh.housekeeping_timer);
486         /*
487          * If the timer fired while we waited for it, it will have
488          * requeued the work. Now the work will be running again
489          * but will not rearm the timer again because it checks
490          * whether the interface is running, which, at this point,
491          * it no longer is.
492          */
493         cancel_work_sync(&sdata->u.mesh.work);
494
495         /*
496          * When we get here, the interface is marked down.
497          * Call synchronize_rcu() to wait for the RX path
498          * should it be using the interface and enqueuing
499          * frames at this very time on another CPU.
500          */
501         rcu_barrier(); /* Wait for RX path and call_rcu()'s */
502         skb_queue_purge(&sdata->u.mesh.skb_queue);
503 }
504
505 static void ieee80211_mesh_rx_bcn_presp(struct ieee80211_sub_if_data *sdata,
506                                         u16 stype,
507                                         struct ieee80211_mgmt *mgmt,
508                                         size_t len,
509                                         struct ieee80211_rx_status *rx_status)
510 {
511         struct ieee80211_local *local = sdata->local;
512         struct ieee802_11_elems elems;
513         struct ieee80211_channel *channel;
514         u32 supp_rates = 0;
515         size_t baselen;
516         int freq;
517         enum ieee80211_band band = rx_status->band;
518
519         /* ignore ProbeResp to foreign address */
520         if (stype == IEEE80211_STYPE_PROBE_RESP &&
521             compare_ether_addr(mgmt->da, sdata->dev->dev_addr))
522                 return;
523
524         baselen = (u8 *) mgmt->u.probe_resp.variable - (u8 *) mgmt;
525         if (baselen > len)
526                 return;
527
528         ieee802_11_parse_elems(mgmt->u.probe_resp.variable, len - baselen,
529                                &elems);
530
531         if (elems.ds_params && elems.ds_params_len == 1)
532                 freq = ieee80211_channel_to_frequency(elems.ds_params[0]);
533         else
534                 freq = rx_status->freq;
535
536         channel = ieee80211_get_channel(local->hw.wiphy, freq);
537
538         if (!channel || channel->flags & IEEE80211_CHAN_DISABLED)
539                 return;
540
541         if (elems.mesh_id && elems.mesh_config &&
542             mesh_matches_local(&elems, sdata)) {
543                 supp_rates = ieee80211_sta_get_rates(local, &elems, band);
544
545                 mesh_neighbour_update(mgmt->sa, supp_rates, sdata,
546                                       mesh_peer_accepts_plinks(&elems));
547         }
548 }
549
550 static void ieee80211_mesh_rx_mgmt_action(struct ieee80211_sub_if_data *sdata,
551                                           struct ieee80211_mgmt *mgmt,
552                                           size_t len,
553                                           struct ieee80211_rx_status *rx_status)
554 {
555         switch (mgmt->u.action.category) {
556         case MESH_PLINK_CATEGORY:
557                 mesh_rx_plink_frame(sdata, mgmt, len, rx_status);
558                 break;
559         case MESH_PATH_SEL_CATEGORY:
560                 mesh_rx_path_sel_frame(sdata, mgmt, len);
561                 break;
562         }
563 }
564
565 static void ieee80211_mesh_rx_queued_mgmt(struct ieee80211_sub_if_data *sdata,
566                                           struct sk_buff *skb)
567 {
568         struct ieee80211_rx_status *rx_status;
569         struct ieee80211_if_mesh *ifmsh;
570         struct ieee80211_mgmt *mgmt;
571         u16 stype;
572
573         ifmsh = &sdata->u.mesh;
574
575         rx_status = IEEE80211_SKB_RXCB(skb);
576         mgmt = (struct ieee80211_mgmt *) skb->data;
577         stype = le16_to_cpu(mgmt->frame_control) & IEEE80211_FCTL_STYPE;
578
579         switch (stype) {
580         case IEEE80211_STYPE_PROBE_RESP:
581         case IEEE80211_STYPE_BEACON:
582                 ieee80211_mesh_rx_bcn_presp(sdata, stype, mgmt, skb->len,
583                                             rx_status);
584                 break;
585         case IEEE80211_STYPE_ACTION:
586                 ieee80211_mesh_rx_mgmt_action(sdata, mgmt, skb->len, rx_status);
587                 break;
588         }
589
590         kfree_skb(skb);
591 }
592
593 static void ieee80211_mesh_work(struct work_struct *work)
594 {
595         struct ieee80211_sub_if_data *sdata =
596                 container_of(work, struct ieee80211_sub_if_data, u.mesh.work);
597         struct ieee80211_local *local = sdata->local;
598         struct ieee80211_if_mesh *ifmsh = &sdata->u.mesh;
599         struct sk_buff *skb;
600
601         if (!netif_running(sdata->dev))
602                 return;
603
604         if (local->scanning)
605                 return;
606
607         while ((skb = skb_dequeue(&ifmsh->skb_queue)))
608                 ieee80211_mesh_rx_queued_mgmt(sdata, skb);
609
610         if (ifmsh->preq_queue_len &&
611             time_after(jiffies,
612                        ifmsh->last_preq + msecs_to_jiffies(ifmsh->mshcfg.dot11MeshHWMPpreqMinInterval)))
613                 mesh_path_start_discovery(sdata);
614
615         if (test_and_clear_bit(MESH_WORK_GROW_MPATH_TABLE, &ifmsh->wrkq_flags))
616                 mesh_mpath_table_grow();
617
618         if (test_and_clear_bit(MESH_WORK_GROW_MPATH_TABLE, &ifmsh->wrkq_flags))
619                 mesh_mpp_table_grow();
620
621         if (test_and_clear_bit(MESH_WORK_HOUSEKEEPING, &ifmsh->wrkq_flags))
622                 ieee80211_mesh_housekeeping(sdata, ifmsh);
623 }
624
625 void ieee80211_mesh_notify_scan_completed(struct ieee80211_local *local)
626 {
627         struct ieee80211_sub_if_data *sdata;
628
629         rcu_read_lock();
630         list_for_each_entry_rcu(sdata, &local->interfaces, list)
631                 if (ieee80211_vif_is_mesh(&sdata->vif))
632                         ieee80211_queue_work(&local->hw, &sdata->u.mesh.work);
633         rcu_read_unlock();
634 }
635
636 void ieee80211_mesh_init_sdata(struct ieee80211_sub_if_data *sdata)
637 {
638         struct ieee80211_if_mesh *ifmsh = &sdata->u.mesh;
639
640         INIT_WORK(&ifmsh->work, ieee80211_mesh_work);
641         setup_timer(&ifmsh->housekeeping_timer,
642                     ieee80211_mesh_housekeeping_timer,
643                     (unsigned long) sdata);
644         skb_queue_head_init(&sdata->u.mesh.skb_queue);
645
646         ifmsh->mshcfg.dot11MeshRetryTimeout = MESH_RET_T;
647         ifmsh->mshcfg.dot11MeshConfirmTimeout = MESH_CONF_T;
648         ifmsh->mshcfg.dot11MeshHoldingTimeout = MESH_HOLD_T;
649         ifmsh->mshcfg.dot11MeshMaxRetries = MESH_MAX_RETR;
650         ifmsh->mshcfg.dot11MeshTTL = MESH_TTL;
651         ifmsh->mshcfg.auto_open_plinks = true;
652         ifmsh->mshcfg.dot11MeshMaxPeerLinks =
653                 MESH_MAX_ESTAB_PLINKS;
654         ifmsh->mshcfg.dot11MeshHWMPactivePathTimeout =
655                 MESH_PATH_TIMEOUT;
656         ifmsh->mshcfg.dot11MeshHWMPpreqMinInterval =
657                 MESH_PREQ_MIN_INT;
658         ifmsh->mshcfg.dot11MeshHWMPnetDiameterTraversalTime =
659                 MESH_DIAM_TRAVERSAL_TIME;
660         ifmsh->mshcfg.dot11MeshHWMPmaxPREQretries =
661                 MESH_MAX_PREQ_RETRIES;
662         ifmsh->mshcfg.path_refresh_time =
663                 MESH_PATH_REFRESH_TIME;
664         ifmsh->mshcfg.min_discovery_timeout =
665                 MESH_MIN_DISCOVERY_TIMEOUT;
666         ifmsh->accepting_plinks = true;
667         ifmsh->preq_id = 0;
668         ifmsh->dsn = 0;
669         atomic_set(&ifmsh->mpaths, 0);
670         mesh_rmc_init(sdata);
671         ifmsh->last_preq = jiffies;
672         /* Allocate all mesh structures when creating the first mesh interface. */
673         if (!mesh_allocated)
674                 ieee80211s_init();
675         mesh_ids_set_default(ifmsh);
676         setup_timer(&ifmsh->mesh_path_timer,
677                     ieee80211_mesh_path_timer,
678                     (unsigned long) sdata);
679         INIT_LIST_HEAD(&ifmsh->preq_queue.list);
680         spin_lock_init(&ifmsh->mesh_preq_queue_lock);
681 }
682
683 ieee80211_rx_result
684 ieee80211_mesh_rx_mgmt(struct ieee80211_sub_if_data *sdata, struct sk_buff *skb)
685 {
686         struct ieee80211_local *local = sdata->local;
687         struct ieee80211_if_mesh *ifmsh = &sdata->u.mesh;
688         struct ieee80211_mgmt *mgmt;
689         u16 fc;
690
691         if (skb->len < 24)
692                 return RX_DROP_MONITOR;
693
694         mgmt = (struct ieee80211_mgmt *) skb->data;
695         fc = le16_to_cpu(mgmt->frame_control);
696
697         switch (fc & IEEE80211_FCTL_STYPE) {
698         case IEEE80211_STYPE_ACTION:
699                 if (skb->len < IEEE80211_MIN_ACTION_SIZE)
700                         return RX_DROP_MONITOR;
701                 /* fall through */
702         case IEEE80211_STYPE_PROBE_RESP:
703         case IEEE80211_STYPE_BEACON:
704                 skb_queue_tail(&ifmsh->skb_queue, skb);
705                 ieee80211_queue_work(&local->hw, &ifmsh->work);
706                 return RX_QUEUED;
707         }
708
709         return RX_CONTINUE;
710 }