Merge branch 'misc' of git://git.kernel.org/pub/scm/linux/kernel/git/mmarek/kbuild-2.6
[linux-2.6-microblaze.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 <linux/slab.h>
12 #include <asm/unaligned.h>
13 #include "ieee80211_i.h"
14 #include "mesh.h"
15
16 #define IEEE80211_MESH_PEER_INACTIVITY_LIMIT (1800 * HZ)
17 #define IEEE80211_MESH_HOUSEKEEPING_INTERVAL (60 * HZ)
18 #define IEEE80211_MESH_RANN_INTERVAL         (1 * HZ)
19
20 #define MESHCONF_CAPAB_ACCEPT_PLINKS 0x01
21 #define MESHCONF_CAPAB_FORWARDING    0x08
22
23 #define TMR_RUNNING_HK  0
24 #define TMR_RUNNING_MP  1
25 #define TMR_RUNNING_MPR 2
26
27 int mesh_allocated;
28 static struct kmem_cache *rm_cache;
29
30 void ieee80211s_init(void)
31 {
32         mesh_pathtbl_init();
33         mesh_allocated = 1;
34         rm_cache = kmem_cache_create("mesh_rmc", sizeof(struct rmc_entry),
35                                      0, 0, NULL);
36 }
37
38 void ieee80211s_stop(void)
39 {
40         mesh_pathtbl_unregister();
41         kmem_cache_destroy(rm_cache);
42 }
43
44 static void ieee80211_mesh_housekeeping_timer(unsigned long data)
45 {
46         struct ieee80211_sub_if_data *sdata = (void *) data;
47         struct ieee80211_local *local = sdata->local;
48         struct ieee80211_if_mesh *ifmsh = &sdata->u.mesh;
49
50         set_bit(MESH_WORK_HOUSEKEEPING, &ifmsh->wrkq_flags);
51
52         if (local->quiescing) {
53                 set_bit(TMR_RUNNING_HK, &ifmsh->timers_running);
54                 return;
55         }
56
57         ieee80211_queue_work(&local->hw, &sdata->work);
58 }
59
60 /**
61  * mesh_matches_local - check if the config of a mesh point matches ours
62  *
63  * @ie: information elements of a management frame from the mesh peer
64  * @sdata: local mesh subif
65  *
66  * This function checks if the mesh configuration of a mesh point matches the
67  * local mesh configuration, i.e. if both nodes belong to the same mesh network.
68  */
69 bool mesh_matches_local(struct ieee802_11_elems *ie, struct ieee80211_sub_if_data *sdata)
70 {
71         struct ieee80211_if_mesh *ifmsh = &sdata->u.mesh;
72
73         /*
74          * As support for each feature is added, check for matching
75          * - On mesh config capabilities
76          *   - Power Save Support En
77          *   - Sync support enabled
78          *   - Sync support active
79          *   - Sync support required from peer
80          *   - MDA enabled
81          * - Power management control on fc
82          */
83         if (ifmsh->mesh_id_len == ie->mesh_id_len &&
84                 memcmp(ifmsh->mesh_id, ie->mesh_id, ie->mesh_id_len) == 0 &&
85                 (ifmsh->mesh_pp_id == ie->mesh_config->meshconf_psel) &&
86                 (ifmsh->mesh_pm_id == ie->mesh_config->meshconf_pmetric) &&
87                 (ifmsh->mesh_cc_id == ie->mesh_config->meshconf_congest) &&
88                 (ifmsh->mesh_sp_id == ie->mesh_config->meshconf_synch) &&
89                 (ifmsh->mesh_auth_id == ie->mesh_config->meshconf_auth))
90                 return true;
91
92         return false;
93 }
94
95 /**
96  * mesh_peer_accepts_plinks - check if an mp is willing to establish peer links
97  *
98  * @ie: information elements of a management frame from the mesh peer
99  */
100 bool mesh_peer_accepts_plinks(struct ieee802_11_elems *ie)
101 {
102         return (ie->mesh_config->meshconf_cap &
103             MESHCONF_CAPAB_ACCEPT_PLINKS) != 0;
104 }
105
106 /**
107  * mesh_accept_plinks_update: update accepting_plink in local mesh beacons
108  *
109  * @sdata: mesh interface in which mesh beacons are going to be updated
110  */
111 void mesh_accept_plinks_update(struct ieee80211_sub_if_data *sdata)
112 {
113         bool free_plinks;
114
115         /* In case mesh_plink_free_count > 0 and mesh_plinktbl_capacity == 0,
116          * the mesh interface might be able to establish plinks with peers that
117          * are already on the table but are not on PLINK_ESTAB state. However,
118          * in general the mesh interface is not accepting peer link requests
119          * from new peers, and that must be reflected in the beacon
120          */
121         free_plinks = mesh_plink_availables(sdata);
122
123         if (free_plinks != sdata->u.mesh.accepting_plinks)
124                 ieee80211_mesh_housekeeping_timer((unsigned long) sdata);
125 }
126
127 int mesh_rmc_init(struct ieee80211_sub_if_data *sdata)
128 {
129         int i;
130
131         sdata->u.mesh.rmc = kmalloc(sizeof(struct mesh_rmc), GFP_KERNEL);
132         if (!sdata->u.mesh.rmc)
133                 return -ENOMEM;
134         sdata->u.mesh.rmc->idx_mask = RMC_BUCKETS - 1;
135         for (i = 0; i < RMC_BUCKETS; i++)
136                 INIT_LIST_HEAD(&sdata->u.mesh.rmc->bucket[i].list);
137         return 0;
138 }
139
140 void mesh_rmc_free(struct ieee80211_sub_if_data *sdata)
141 {
142         struct mesh_rmc *rmc = sdata->u.mesh.rmc;
143         struct rmc_entry *p, *n;
144         int i;
145
146         if (!sdata->u.mesh.rmc)
147                 return;
148
149         for (i = 0; i < RMC_BUCKETS; i++)
150                 list_for_each_entry_safe(p, n, &rmc->bucket[i].list, list) {
151                         list_del(&p->list);
152                         kmem_cache_free(rm_cache, p);
153                 }
154
155         kfree(rmc);
156         sdata->u.mesh.rmc = NULL;
157 }
158
159 /**
160  * mesh_rmc_check - Check frame in recent multicast cache and add if absent.
161  *
162  * @sa:         source address
163  * @mesh_hdr:   mesh_header
164  *
165  * Returns: 0 if the frame is not in the cache, nonzero otherwise.
166  *
167  * Checks using the source address and the mesh sequence number if we have
168  * received this frame lately. If the frame is not in the cache, it is added to
169  * it.
170  */
171 int mesh_rmc_check(u8 *sa, struct ieee80211s_hdr *mesh_hdr,
172                    struct ieee80211_sub_if_data *sdata)
173 {
174         struct mesh_rmc *rmc = sdata->u.mesh.rmc;
175         u32 seqnum = 0;
176         int entries = 0;
177         u8 idx;
178         struct rmc_entry *p, *n;
179
180         /* Don't care about endianness since only match matters */
181         memcpy(&seqnum, &mesh_hdr->seqnum, sizeof(mesh_hdr->seqnum));
182         idx = le32_to_cpu(mesh_hdr->seqnum) & rmc->idx_mask;
183         list_for_each_entry_safe(p, n, &rmc->bucket[idx].list, list) {
184                 ++entries;
185                 if (time_after(jiffies, p->exp_time) ||
186                                 (entries == RMC_QUEUE_MAX_LEN)) {
187                         list_del(&p->list);
188                         kmem_cache_free(rm_cache, p);
189                         --entries;
190                 } else if ((seqnum == p->seqnum) &&
191                            (memcmp(sa, p->sa, ETH_ALEN) == 0))
192                         return -1;
193         }
194
195         p = kmem_cache_alloc(rm_cache, GFP_ATOMIC);
196         if (!p) {
197                 printk(KERN_DEBUG "o11s: could not allocate RMC entry\n");
198                 return 0;
199         }
200         p->seqnum = seqnum;
201         p->exp_time = jiffies + RMC_TIMEOUT;
202         memcpy(p->sa, sa, ETH_ALEN);
203         list_add(&p->list, &rmc->bucket[idx].list);
204         return 0;
205 }
206
207 void mesh_mgmt_ies_add(struct sk_buff *skb, struct ieee80211_sub_if_data *sdata)
208 {
209         struct ieee80211_local *local = sdata->local;
210         struct ieee80211_supported_band *sband;
211         u8 *pos;
212         int len, i, rate;
213         u8 neighbors;
214
215         sband = local->hw.wiphy->bands[local->hw.conf.channel->band];
216         len = sband->n_bitrates;
217         if (len > 8)
218                 len = 8;
219         pos = skb_put(skb, len + 2);
220         *pos++ = WLAN_EID_SUPP_RATES;
221         *pos++ = len;
222         for (i = 0; i < len; i++) {
223                 rate = sband->bitrates[i].bitrate;
224                 *pos++ = (u8) (rate / 5);
225         }
226
227         if (sband->n_bitrates > len) {
228                 pos = skb_put(skb, sband->n_bitrates - len + 2);
229                 *pos++ = WLAN_EID_EXT_SUPP_RATES;
230                 *pos++ = sband->n_bitrates - len;
231                 for (i = len; i < sband->n_bitrates; i++) {
232                         rate = sband->bitrates[i].bitrate;
233                         *pos++ = (u8) (rate / 5);
234                 }
235         }
236
237         if (sband->band == IEEE80211_BAND_2GHZ) {
238                 pos = skb_put(skb, 2 + 1);
239                 *pos++ = WLAN_EID_DS_PARAMS;
240                 *pos++ = 1;
241                 *pos++ = ieee80211_frequency_to_channel(local->hw.conf.channel->center_freq);
242         }
243
244         pos = skb_put(skb, 2 + sdata->u.mesh.mesh_id_len);
245         *pos++ = WLAN_EID_MESH_ID;
246         *pos++ = sdata->u.mesh.mesh_id_len;
247         if (sdata->u.mesh.mesh_id_len)
248                 memcpy(pos, sdata->u.mesh.mesh_id, sdata->u.mesh.mesh_id_len);
249
250         pos = skb_put(skb, 2 + sizeof(struct ieee80211_meshconf_ie));
251         *pos++ = WLAN_EID_MESH_CONFIG;
252         *pos++ = sizeof(struct ieee80211_meshconf_ie);
253
254         /* Active path selection protocol ID */
255         *pos++ = sdata->u.mesh.mesh_pp_id;
256
257         /* Active path selection metric ID   */
258         *pos++ = sdata->u.mesh.mesh_pm_id;
259
260         /* Congestion control mode identifier */
261         *pos++ = sdata->u.mesh.mesh_cc_id;
262
263         /* Synchronization protocol identifier */
264         *pos++ = sdata->u.mesh.mesh_sp_id;
265
266         /* Authentication Protocol identifier */
267         *pos++ = sdata->u.mesh.mesh_auth_id;
268
269         /* Mesh Formation Info - number of neighbors */
270         neighbors = atomic_read(&sdata->u.mesh.mshstats.estab_plinks);
271         /* Number of neighbor mesh STAs or 15 whichever is smaller */
272         neighbors = (neighbors > 15) ? 15 : neighbors;
273         *pos++ = neighbors << 1;
274
275         /* Mesh capability */
276         sdata->u.mesh.accepting_plinks = mesh_plink_availables(sdata);
277         *pos = MESHCONF_CAPAB_FORWARDING;
278         *pos++ |= sdata->u.mesh.accepting_plinks ?
279             MESHCONF_CAPAB_ACCEPT_PLINKS : 0x00;
280         *pos++ = 0x00;
281
282         if (sdata->u.mesh.vendor_ie) {
283                 int len = sdata->u.mesh.vendor_ie_len;
284                 const u8 *data = sdata->u.mesh.vendor_ie;
285                 if (skb_tailroom(skb) > len)
286                         memcpy(skb_put(skb, len), data, len);
287         }
288 }
289
290 u32 mesh_table_hash(u8 *addr, struct ieee80211_sub_if_data *sdata, struct mesh_table *tbl)
291 {
292         /* Use last four bytes of hw addr and interface index as hash index */
293         return jhash_2words(*(u32 *)(addr+2), sdata->dev->ifindex, tbl->hash_rnd)
294                 & tbl->hash_mask;
295 }
296
297 struct mesh_table *mesh_table_alloc(int size_order)
298 {
299         int i;
300         struct mesh_table *newtbl;
301
302         newtbl = kmalloc(sizeof(struct mesh_table), GFP_KERNEL);
303         if (!newtbl)
304                 return NULL;
305
306         newtbl->hash_buckets = kzalloc(sizeof(struct hlist_head) *
307                         (1 << size_order), GFP_KERNEL);
308
309         if (!newtbl->hash_buckets) {
310                 kfree(newtbl);
311                 return NULL;
312         }
313
314         newtbl->hashwlock = kmalloc(sizeof(spinlock_t) *
315                         (1 << size_order), GFP_KERNEL);
316         if (!newtbl->hashwlock) {
317                 kfree(newtbl->hash_buckets);
318                 kfree(newtbl);
319                 return NULL;
320         }
321
322         newtbl->size_order = size_order;
323         newtbl->hash_mask = (1 << size_order) - 1;
324         atomic_set(&newtbl->entries,  0);
325         get_random_bytes(&newtbl->hash_rnd,
326                         sizeof(newtbl->hash_rnd));
327         for (i = 0; i <= newtbl->hash_mask; i++)
328                 spin_lock_init(&newtbl->hashwlock[i]);
329
330         return newtbl;
331 }
332
333
334 static void ieee80211_mesh_path_timer(unsigned long data)
335 {
336         struct ieee80211_sub_if_data *sdata =
337                 (struct ieee80211_sub_if_data *) data;
338         struct ieee80211_if_mesh *ifmsh = &sdata->u.mesh;
339         struct ieee80211_local *local = sdata->local;
340
341         if (local->quiescing) {
342                 set_bit(TMR_RUNNING_MP, &ifmsh->timers_running);
343                 return;
344         }
345
346         ieee80211_queue_work(&local->hw, &sdata->work);
347 }
348
349 static void ieee80211_mesh_path_root_timer(unsigned long data)
350 {
351         struct ieee80211_sub_if_data *sdata =
352                 (struct ieee80211_sub_if_data *) data;
353         struct ieee80211_if_mesh *ifmsh = &sdata->u.mesh;
354         struct ieee80211_local *local = sdata->local;
355
356         set_bit(MESH_WORK_ROOT, &ifmsh->wrkq_flags);
357
358         if (local->quiescing) {
359                 set_bit(TMR_RUNNING_MPR, &ifmsh->timers_running);
360                 return;
361         }
362
363         ieee80211_queue_work(&local->hw, &sdata->work);
364 }
365
366 void ieee80211_mesh_root_setup(struct ieee80211_if_mesh *ifmsh)
367 {
368         if (ifmsh->mshcfg.dot11MeshHWMPRootMode)
369                 set_bit(MESH_WORK_ROOT, &ifmsh->wrkq_flags);
370         else {
371                 clear_bit(MESH_WORK_ROOT, &ifmsh->wrkq_flags);
372                 /* stop running timer */
373                 del_timer_sync(&ifmsh->mesh_path_root_timer);
374         }
375 }
376
377 /**
378  * ieee80211_fill_mesh_addresses - fill addresses of a locally originated mesh frame
379  * @hdr:        802.11 frame header
380  * @fc:         frame control field
381  * @meshda:     destination address in the mesh
382  * @meshsa:     source address address in the mesh.  Same as TA, as frame is
383  *              locally originated.
384  *
385  * Return the length of the 802.11 (does not include a mesh control header)
386  */
387 int ieee80211_fill_mesh_addresses(struct ieee80211_hdr *hdr, __le16 *fc,
388                                   const u8 *meshda, const u8 *meshsa)
389 {
390         if (is_multicast_ether_addr(meshda)) {
391                 *fc |= cpu_to_le16(IEEE80211_FCTL_FROMDS);
392                 /* DA TA SA */
393                 memcpy(hdr->addr1, meshda, ETH_ALEN);
394                 memcpy(hdr->addr2, meshsa, ETH_ALEN);
395                 memcpy(hdr->addr3, meshsa, ETH_ALEN);
396                 return 24;
397         } else {
398                 *fc |= cpu_to_le16(IEEE80211_FCTL_FROMDS |
399                                 IEEE80211_FCTL_TODS);
400                 /* RA TA DA SA */
401                 memset(hdr->addr1, 0, ETH_ALEN);   /* RA is resolved later */
402                 memcpy(hdr->addr2, meshsa, ETH_ALEN);
403                 memcpy(hdr->addr3, meshda, ETH_ALEN);
404                 memcpy(hdr->addr4, meshsa, ETH_ALEN);
405                 return 30;
406         }
407 }
408
409 /**
410  * ieee80211_new_mesh_header - create a new mesh header
411  * @meshhdr:    uninitialized mesh header
412  * @sdata:      mesh interface to be used
413  * @addr4or5:   1st address in the ae header, which may correspond to address 4
414  *              (if addr6 is NULL) or address 5 (if addr6 is present). It may
415  *              be NULL.
416  * @addr6:      2nd address in the ae header, which corresponds to addr6 of the
417  *              mesh frame
418  *
419  * Return the header length.
420  */
421 int ieee80211_new_mesh_header(struct ieee80211s_hdr *meshhdr,
422                 struct ieee80211_sub_if_data *sdata, char *addr4or5,
423                 char *addr6)
424 {
425         int aelen = 0;
426         BUG_ON(!addr4or5 && addr6);
427         memset(meshhdr, 0, sizeof(*meshhdr));
428         meshhdr->ttl = sdata->u.mesh.mshcfg.dot11MeshTTL;
429         put_unaligned(cpu_to_le32(sdata->u.mesh.mesh_seqnum), &meshhdr->seqnum);
430         sdata->u.mesh.mesh_seqnum++;
431         if (addr4or5 && !addr6) {
432                 meshhdr->flags |= MESH_FLAGS_AE_A4;
433                 aelen += ETH_ALEN;
434                 memcpy(meshhdr->eaddr1, addr4or5, ETH_ALEN);
435         } else if (addr4or5 && addr6) {
436                 meshhdr->flags |= MESH_FLAGS_AE_A5_A6;
437                 aelen += 2 * ETH_ALEN;
438                 memcpy(meshhdr->eaddr1, addr4or5, ETH_ALEN);
439                 memcpy(meshhdr->eaddr2, addr6, ETH_ALEN);
440         }
441         return 6 + aelen;
442 }
443
444 static void ieee80211_mesh_housekeeping(struct ieee80211_sub_if_data *sdata,
445                            struct ieee80211_if_mesh *ifmsh)
446 {
447         bool free_plinks;
448
449 #ifdef CONFIG_MAC80211_VERBOSE_DEBUG
450         printk(KERN_DEBUG "%s: running mesh housekeeping\n",
451                sdata->name);
452 #endif
453
454         ieee80211_sta_expire(sdata, IEEE80211_MESH_PEER_INACTIVITY_LIMIT);
455         mesh_path_expire(sdata);
456
457         free_plinks = mesh_plink_availables(sdata);
458         if (free_plinks != sdata->u.mesh.accepting_plinks)
459                 ieee80211_bss_info_change_notify(sdata, BSS_CHANGED_BEACON);
460
461         mod_timer(&ifmsh->housekeeping_timer,
462                   round_jiffies(jiffies + IEEE80211_MESH_HOUSEKEEPING_INTERVAL));
463 }
464
465 static void ieee80211_mesh_rootpath(struct ieee80211_sub_if_data *sdata)
466 {
467         struct ieee80211_if_mesh *ifmsh = &sdata->u.mesh;
468
469         mesh_path_tx_root_frame(sdata);
470         mod_timer(&ifmsh->mesh_path_root_timer,
471                   round_jiffies(jiffies + IEEE80211_MESH_RANN_INTERVAL));
472 }
473
474 #ifdef CONFIG_PM
475 void ieee80211_mesh_quiesce(struct ieee80211_sub_if_data *sdata)
476 {
477         struct ieee80211_if_mesh *ifmsh = &sdata->u.mesh;
478
479         /* use atomic bitops in case both timers fire at the same time */
480
481         if (del_timer_sync(&ifmsh->housekeeping_timer))
482                 set_bit(TMR_RUNNING_HK, &ifmsh->timers_running);
483         if (del_timer_sync(&ifmsh->mesh_path_timer))
484                 set_bit(TMR_RUNNING_MP, &ifmsh->timers_running);
485         if (del_timer_sync(&ifmsh->mesh_path_root_timer))
486                 set_bit(TMR_RUNNING_MPR, &ifmsh->timers_running);
487 }
488
489 void ieee80211_mesh_restart(struct ieee80211_sub_if_data *sdata)
490 {
491         struct ieee80211_if_mesh *ifmsh = &sdata->u.mesh;
492
493         if (test_and_clear_bit(TMR_RUNNING_HK, &ifmsh->timers_running))
494                 add_timer(&ifmsh->housekeeping_timer);
495         if (test_and_clear_bit(TMR_RUNNING_MP, &ifmsh->timers_running))
496                 add_timer(&ifmsh->mesh_path_timer);
497         if (test_and_clear_bit(TMR_RUNNING_MPR, &ifmsh->timers_running))
498                 add_timer(&ifmsh->mesh_path_root_timer);
499         ieee80211_mesh_root_setup(ifmsh);
500 }
501 #endif
502
503 void ieee80211_start_mesh(struct ieee80211_sub_if_data *sdata)
504 {
505         struct ieee80211_if_mesh *ifmsh = &sdata->u.mesh;
506         struct ieee80211_local *local = sdata->local;
507
508         local->fif_other_bss++;
509         /* mesh ifaces must set allmulti to forward mcast traffic */
510         atomic_inc(&local->iff_allmultis);
511         ieee80211_configure_filter(local);
512
513         ifmsh->mesh_cc_id = 0;  /* Disabled */
514         ifmsh->mesh_sp_id = 0;  /* Neighbor Offset */
515         ifmsh->mesh_auth_id = 0;        /* Disabled */
516         set_bit(MESH_WORK_HOUSEKEEPING, &ifmsh->wrkq_flags);
517         ieee80211_mesh_root_setup(ifmsh);
518         ieee80211_queue_work(&local->hw, &sdata->work);
519         sdata->vif.bss_conf.beacon_int = MESH_DEFAULT_BEACON_INTERVAL;
520         ieee80211_bss_info_change_notify(sdata, BSS_CHANGED_BEACON |
521                                                 BSS_CHANGED_BEACON_ENABLED |
522                                                 BSS_CHANGED_BEACON_INT);
523 }
524
525 void ieee80211_stop_mesh(struct ieee80211_sub_if_data *sdata)
526 {
527         struct ieee80211_local *local = sdata->local;
528         struct ieee80211_if_mesh *ifmsh = &sdata->u.mesh;
529
530         ifmsh->mesh_id_len = 0;
531         ieee80211_bss_info_change_notify(sdata, BSS_CHANGED_BEACON_ENABLED);
532         sta_info_flush(local, NULL);
533
534         del_timer_sync(&sdata->u.mesh.housekeeping_timer);
535         del_timer_sync(&sdata->u.mesh.mesh_path_root_timer);
536         /*
537          * If the timer fired while we waited for it, it will have
538          * requeued the work. Now the work will be running again
539          * but will not rearm the timer again because it checks
540          * whether the interface is running, which, at this point,
541          * it no longer is.
542          */
543         cancel_work_sync(&sdata->work);
544
545         local->fif_other_bss--;
546         atomic_dec(&local->iff_allmultis);
547         ieee80211_configure_filter(local);
548 }
549
550 static void ieee80211_mesh_rx_bcn_presp(struct ieee80211_sub_if_data *sdata,
551                                         u16 stype,
552                                         struct ieee80211_mgmt *mgmt,
553                                         size_t len,
554                                         struct ieee80211_rx_status *rx_status)
555 {
556         struct ieee80211_local *local = sdata->local;
557         struct ieee802_11_elems elems;
558         struct ieee80211_channel *channel;
559         u32 supp_rates = 0;
560         size_t baselen;
561         int freq;
562         enum ieee80211_band band = rx_status->band;
563
564         /* ignore ProbeResp to foreign address */
565         if (stype == IEEE80211_STYPE_PROBE_RESP &&
566             compare_ether_addr(mgmt->da, sdata->vif.addr))
567                 return;
568
569         baselen = (u8 *) mgmt->u.probe_resp.variable - (u8 *) mgmt;
570         if (baselen > len)
571                 return;
572
573         ieee802_11_parse_elems(mgmt->u.probe_resp.variable, len - baselen,
574                                &elems);
575
576         if (elems.ds_params && elems.ds_params_len == 1)
577                 freq = ieee80211_channel_to_frequency(elems.ds_params[0], band);
578         else
579                 freq = rx_status->freq;
580
581         channel = ieee80211_get_channel(local->hw.wiphy, freq);
582
583         if (!channel || channel->flags & IEEE80211_CHAN_DISABLED)
584                 return;
585
586         if (elems.mesh_id && elems.mesh_config &&
587             mesh_matches_local(&elems, sdata)) {
588                 supp_rates = ieee80211_sta_get_rates(local, &elems, band);
589
590                 mesh_neighbour_update(mgmt->sa, supp_rates, sdata,
591                                       mesh_peer_accepts_plinks(&elems));
592         }
593 }
594
595 static void ieee80211_mesh_rx_mgmt_action(struct ieee80211_sub_if_data *sdata,
596                                           struct ieee80211_mgmt *mgmt,
597                                           size_t len,
598                                           struct ieee80211_rx_status *rx_status)
599 {
600         switch (mgmt->u.action.category) {
601         case WLAN_CATEGORY_MESH_PLINK:
602                 mesh_rx_plink_frame(sdata, mgmt, len, rx_status);
603                 break;
604         case WLAN_CATEGORY_MESH_PATH_SEL:
605                 mesh_rx_path_sel_frame(sdata, mgmt, len);
606                 break;
607         }
608 }
609
610 void ieee80211_mesh_rx_queued_mgmt(struct ieee80211_sub_if_data *sdata,
611                                    struct sk_buff *skb)
612 {
613         struct ieee80211_rx_status *rx_status;
614         struct ieee80211_if_mesh *ifmsh;
615         struct ieee80211_mgmt *mgmt;
616         u16 stype;
617
618         ifmsh = &sdata->u.mesh;
619
620         rx_status = IEEE80211_SKB_RXCB(skb);
621         mgmt = (struct ieee80211_mgmt *) skb->data;
622         stype = le16_to_cpu(mgmt->frame_control) & IEEE80211_FCTL_STYPE;
623
624         switch (stype) {
625         case IEEE80211_STYPE_PROBE_RESP:
626         case IEEE80211_STYPE_BEACON:
627                 ieee80211_mesh_rx_bcn_presp(sdata, stype, mgmt, skb->len,
628                                             rx_status);
629                 break;
630         case IEEE80211_STYPE_ACTION:
631                 ieee80211_mesh_rx_mgmt_action(sdata, mgmt, skb->len, rx_status);
632                 break;
633         }
634 }
635
636 void ieee80211_mesh_work(struct ieee80211_sub_if_data *sdata)
637 {
638         struct ieee80211_if_mesh *ifmsh = &sdata->u.mesh;
639
640         if (ifmsh->preq_queue_len &&
641             time_after(jiffies,
642                        ifmsh->last_preq + msecs_to_jiffies(ifmsh->mshcfg.dot11MeshHWMPpreqMinInterval)))
643                 mesh_path_start_discovery(sdata);
644
645         if (test_and_clear_bit(MESH_WORK_GROW_MPATH_TABLE, &ifmsh->wrkq_flags))
646                 mesh_mpath_table_grow();
647
648         if (test_and_clear_bit(MESH_WORK_GROW_MPP_TABLE, &ifmsh->wrkq_flags))
649                 mesh_mpp_table_grow();
650
651         if (test_and_clear_bit(MESH_WORK_HOUSEKEEPING, &ifmsh->wrkq_flags))
652                 ieee80211_mesh_housekeeping(sdata, ifmsh);
653
654         if (test_and_clear_bit(MESH_WORK_ROOT, &ifmsh->wrkq_flags))
655                 ieee80211_mesh_rootpath(sdata);
656 }
657
658 void ieee80211_mesh_notify_scan_completed(struct ieee80211_local *local)
659 {
660         struct ieee80211_sub_if_data *sdata;
661
662         rcu_read_lock();
663         list_for_each_entry_rcu(sdata, &local->interfaces, list)
664                 if (ieee80211_vif_is_mesh(&sdata->vif))
665                         ieee80211_queue_work(&local->hw, &sdata->work);
666         rcu_read_unlock();
667 }
668
669 void ieee80211_mesh_init_sdata(struct ieee80211_sub_if_data *sdata)
670 {
671         struct ieee80211_if_mesh *ifmsh = &sdata->u.mesh;
672
673         setup_timer(&ifmsh->housekeeping_timer,
674                     ieee80211_mesh_housekeeping_timer,
675                     (unsigned long) sdata);
676
677         ifmsh->accepting_plinks = true;
678         ifmsh->preq_id = 0;
679         ifmsh->sn = 0;
680         atomic_set(&ifmsh->mpaths, 0);
681         mesh_rmc_init(sdata);
682         ifmsh->last_preq = jiffies;
683         /* Allocate all mesh structures when creating the first mesh interface. */
684         if (!mesh_allocated)
685                 ieee80211s_init();
686         setup_timer(&ifmsh->mesh_path_timer,
687                     ieee80211_mesh_path_timer,
688                     (unsigned long) sdata);
689         setup_timer(&ifmsh->mesh_path_root_timer,
690                     ieee80211_mesh_path_root_timer,
691                     (unsigned long) sdata);
692         INIT_LIST_HEAD(&ifmsh->preq_queue.list);
693         spin_lock_init(&ifmsh->mesh_preq_queue_lock);
694 }