mesh: use set_bit() to set MESH_WORK_HOUSEKEEPING.
[linux-2.6.git] / net / mac80211 / mesh.c
1 /*
2  * Copyright (c) 2008 open80211s Ltd.
3  * Authors:    Luis Carlos Cobo <luisca@cozybit.com>
4  *             Javier Cardona <javier@cozybit.com>
5  *
6  * This program is free software; you can redistribute it and/or modify
7  * it under the terms of the GNU General Public License version 2 as
8  * published by the Free Software Foundation.
9  */
10
11 #include <asm/unaligned.h>
12 #include "ieee80211_i.h"
13 #include "mesh.h"
14
15 #define IEEE80211_MESH_PEER_INACTIVITY_LIMIT (1800 * HZ)
16 #define IEEE80211_MESH_HOUSEKEEPING_INTERVAL (60 * HZ)
17
18 #define PP_OFFSET       1               /* Path Selection Protocol */
19 #define PM_OFFSET       5               /* Path Selection Metric   */
20 #define CC_OFFSET       9               /* Congestion Control Mode */
21 #define SP_OFFSET       13              /* Synchronization Protocol */
22 #define AUTH_OFFSET     17              /* Authentication Protocol */
23 #define CAPAB_OFFSET    22
24 #define CAPAB_ACCEPT_PLINKS 0x80
25 #define CAPAB_FORWARDING    0x10
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                 memcmp(ifmsh->mesh_pp_id, ie->mesh_config + PP_OFFSET, 4) == 0 &&
89                 memcmp(ifmsh->mesh_pm_id, ie->mesh_config + PM_OFFSET, 4) == 0 &&
90                 memcmp(ifmsh->mesh_cc_id, ie->mesh_config + CC_OFFSET, 4) == 0 &&
91                 memcmp(ifmsh->mesh_sp_id, ie->mesh_config + SP_OFFSET, 4) == 0 &&
92                 memcmp(ifmsh->mesh_auth_id, ie->mesh_config + AUTH_OFFSET, 4) == 0)
93                 return true;
94
95         return false;
96 }
97
98 /**
99  * mesh_peer_accepts_plinks - check if an mp is willing to establish peer links
100  *
101  * @ie: information elements of a management frame from the mesh peer
102  */
103 bool mesh_peer_accepts_plinks(struct ieee802_11_elems *ie)
104 {
105         return (*(ie->mesh_config + CAPAB_OFFSET) & CAPAB_ACCEPT_PLINKS) != 0;
106 }
107
108 /**
109  * mesh_accept_plinks_update: update accepting_plink in local mesh beacons
110  *
111  * @sdata: mesh interface in which mesh beacons are going to be updated
112  */
113 void mesh_accept_plinks_update(struct ieee80211_sub_if_data *sdata)
114 {
115         bool free_plinks;
116
117         /* In case mesh_plink_free_count > 0 and mesh_plinktbl_capacity == 0,
118          * the mesh interface might be able to establish plinks with peers that
119          * are already on the table but are not on PLINK_ESTAB state. However,
120          * in general the mesh interface is not accepting peer link requests
121          * from new peers, and that must be reflected in the beacon
122          */
123         free_plinks = mesh_plink_availables(sdata);
124
125         if (free_plinks != sdata->u.mesh.accepting_plinks)
126                 ieee80211_mesh_housekeeping_timer((unsigned long) sdata);
127 }
128
129 void mesh_ids_set_default(struct ieee80211_if_mesh *sta)
130 {
131         u8 oui[3] = {0x00, 0x0F, 0xAC};
132
133         memcpy(sta->mesh_pp_id, oui, sizeof(oui));
134         memcpy(sta->mesh_pm_id, oui, sizeof(oui));
135         memcpy(sta->mesh_cc_id, oui, sizeof(oui));
136         memcpy(sta->mesh_sp_id, oui, sizeof(oui));
137         memcpy(sta->mesh_auth_id, oui, sizeof(oui));
138         sta->mesh_pp_id[sizeof(oui)] = 0;
139         sta->mesh_pm_id[sizeof(oui)] = 0;
140         sta->mesh_cc_id[sizeof(oui)] = 0xff;
141         sta->mesh_sp_id[sizeof(oui)] = 0xff;
142         sta->mesh_auth_id[sizeof(oui)] = 0x0;
143 }
144
145 int mesh_rmc_init(struct ieee80211_sub_if_data *sdata)
146 {
147         int i;
148
149         sdata->u.mesh.rmc = kmalloc(sizeof(struct mesh_rmc), GFP_KERNEL);
150         if (!sdata->u.mesh.rmc)
151                 return -ENOMEM;
152         sdata->u.mesh.rmc->idx_mask = RMC_BUCKETS - 1;
153         for (i = 0; i < RMC_BUCKETS; i++)
154                 INIT_LIST_HEAD(&sdata->u.mesh.rmc->bucket[i].list);
155         return 0;
156 }
157
158 void mesh_rmc_free(struct ieee80211_sub_if_data *sdata)
159 {
160         struct mesh_rmc *rmc = sdata->u.mesh.rmc;
161         struct rmc_entry *p, *n;
162         int i;
163
164         if (!sdata->u.mesh.rmc)
165                 return;
166
167         for (i = 0; i < RMC_BUCKETS; i++)
168                 list_for_each_entry_safe(p, n, &rmc->bucket[i].list, list) {
169                         list_del(&p->list);
170                         kmem_cache_free(rm_cache, p);
171                 }
172
173         kfree(rmc);
174         sdata->u.mesh.rmc = NULL;
175 }
176
177 /**
178  * mesh_rmc_check - Check frame in recent multicast cache and add if absent.
179  *
180  * @sa:         source address
181  * @mesh_hdr:   mesh_header
182  *
183  * Returns: 0 if the frame is not in the cache, nonzero otherwise.
184  *
185  * Checks using the source address and the mesh sequence number if we have
186  * received this frame lately. If the frame is not in the cache, it is added to
187  * it.
188  */
189 int mesh_rmc_check(u8 *sa, struct ieee80211s_hdr *mesh_hdr,
190                    struct ieee80211_sub_if_data *sdata)
191 {
192         struct mesh_rmc *rmc = sdata->u.mesh.rmc;
193         u32 seqnum = 0;
194         int entries = 0;
195         u8 idx;
196         struct rmc_entry *p, *n;
197
198         /* Don't care about endianness since only match matters */
199         memcpy(&seqnum, &mesh_hdr->seqnum, sizeof(mesh_hdr->seqnum));
200         idx = le32_to_cpu(mesh_hdr->seqnum) & rmc->idx_mask;
201         list_for_each_entry_safe(p, n, &rmc->bucket[idx].list, list) {
202                 ++entries;
203                 if (time_after(jiffies, p->exp_time) ||
204                                 (entries == RMC_QUEUE_MAX_LEN)) {
205                         list_del(&p->list);
206                         kmem_cache_free(rm_cache, p);
207                         --entries;
208                 } else if ((seqnum == p->seqnum)
209                                 && (memcmp(sa, p->sa, ETH_ALEN) == 0))
210                         return -1;
211         }
212
213         p = kmem_cache_alloc(rm_cache, GFP_ATOMIC);
214         if (!p) {
215                 printk(KERN_DEBUG "o11s: could not allocate RMC entry\n");
216                 return 0;
217         }
218         p->seqnum = seqnum;
219         p->exp_time = jiffies + RMC_TIMEOUT;
220         memcpy(p->sa, sa, ETH_ALEN);
221         list_add(&p->list, &rmc->bucket[idx].list);
222         return 0;
223 }
224
225 void mesh_mgmt_ies_add(struct sk_buff *skb, struct ieee80211_sub_if_data *sdata)
226 {
227         struct ieee80211_local *local = sdata->local;
228         struct ieee80211_supported_band *sband;
229         u8 *pos;
230         int len, i, rate;
231
232         sband = local->hw.wiphy->bands[local->hw.conf.channel->band];
233         len = sband->n_bitrates;
234         if (len > 8)
235                 len = 8;
236         pos = skb_put(skb, len + 2);
237         *pos++ = WLAN_EID_SUPP_RATES;
238         *pos++ = len;
239         for (i = 0; i < len; i++) {
240                 rate = sband->bitrates[i].bitrate;
241                 *pos++ = (u8) (rate / 5);
242         }
243
244         if (sband->n_bitrates > len) {
245                 pos = skb_put(skb, sband->n_bitrates - len + 2);
246                 *pos++ = WLAN_EID_EXT_SUPP_RATES;
247                 *pos++ = sband->n_bitrates - len;
248                 for (i = len; i < sband->n_bitrates; i++) {
249                         rate = sband->bitrates[i].bitrate;
250                         *pos++ = (u8) (rate / 5);
251                 }
252         }
253
254         pos = skb_put(skb, 2 + sdata->u.mesh.mesh_id_len);
255         *pos++ = WLAN_EID_MESH_ID;
256         *pos++ = sdata->u.mesh.mesh_id_len;
257         if (sdata->u.mesh.mesh_id_len)
258                 memcpy(pos, sdata->u.mesh.mesh_id, sdata->u.mesh.mesh_id_len);
259
260         pos = skb_put(skb, 2 + IEEE80211_MESH_CONFIG_LEN);
261         *pos++ = WLAN_EID_MESH_CONFIG;
262         *pos++ = IEEE80211_MESH_CONFIG_LEN;
263         /* Version */
264         *pos++ = 1;
265
266         /* Active path selection protocol ID */
267         memcpy(pos, sdata->u.mesh.mesh_pp_id, 4);
268         pos += 4;
269
270         /* Active path selection metric ID   */
271         memcpy(pos, sdata->u.mesh.mesh_pm_id, 4);
272         pos += 4;
273
274         /* Congestion control mode identifier */
275         memcpy(pos, sdata->u.mesh.mesh_cc_id, 4);
276         pos += 4;
277
278         /* Synchronization protocol identifier */
279         memcpy(pos, sdata->u.mesh.mesh_sp_id, 4);
280         pos += 4;
281
282         /* Authentication Protocol identifier */
283         memcpy(pos, sdata->u.mesh.mesh_auth_id, 4);
284         pos += 4;
285
286         /* Mesh Formation Info */
287         memset(pos, 0x00, 1);
288         pos += 1;
289
290         /* Mesh capability */
291         sdata->u.mesh.accepting_plinks = mesh_plink_availables(sdata);
292         *pos = CAPAB_FORWARDING;
293         *pos++ |= sdata->u.mesh.accepting_plinks ? CAPAB_ACCEPT_PLINKS : 0x00;
294         *pos++ = 0x00;
295
296         return;
297 }
298
299 u32 mesh_table_hash(u8 *addr, struct ieee80211_sub_if_data *sdata, struct mesh_table *tbl)
300 {
301         /* Use last four bytes of hw addr and interface index as hash index */
302         return jhash_2words(*(u32 *)(addr+2), sdata->dev->ifindex, tbl->hash_rnd)
303                 & tbl->hash_mask;
304 }
305
306 struct mesh_table *mesh_table_alloc(int size_order)
307 {
308         int i;
309         struct mesh_table *newtbl;
310
311         newtbl = kmalloc(sizeof(struct mesh_table), GFP_KERNEL);
312         if (!newtbl)
313                 return NULL;
314
315         newtbl->hash_buckets = kzalloc(sizeof(struct hlist_head) *
316                         (1 << size_order), GFP_KERNEL);
317
318         if (!newtbl->hash_buckets) {
319                 kfree(newtbl);
320                 return NULL;
321         }
322
323         newtbl->hashwlock = kmalloc(sizeof(spinlock_t) *
324                         (1 << size_order), GFP_KERNEL);
325         if (!newtbl->hashwlock) {
326                 kfree(newtbl->hash_buckets);
327                 kfree(newtbl);
328                 return NULL;
329         }
330
331         newtbl->size_order = size_order;
332         newtbl->hash_mask = (1 << size_order) - 1;
333         atomic_set(&newtbl->entries,  0);
334         get_random_bytes(&newtbl->hash_rnd,
335                         sizeof(newtbl->hash_rnd));
336         for (i = 0; i <= newtbl->hash_mask; i++)
337                 spin_lock_init(&newtbl->hashwlock[i]);
338
339         return newtbl;
340 }
341
342
343 static void ieee80211_mesh_path_timer(unsigned long data)
344 {
345         struct ieee80211_sub_if_data *sdata =
346                 (struct ieee80211_sub_if_data *) data;
347         struct ieee80211_if_mesh *ifmsh = &sdata->u.mesh;
348         struct ieee80211_local *local = sdata->local;
349
350         if (local->quiescing) {
351                 set_bit(TMR_RUNNING_MP, &ifmsh->timers_running);
352                 return;
353         }
354
355         ieee80211_queue_work(&local->hw, &ifmsh->work);
356 }
357
358 /**
359  * ieee80211_fill_mesh_addresses - fill addresses of a locally originated mesh frame
360  * @hdr:        802.11 frame header
361  * @fc:         frame control field
362  * @meshda:     destination address in the mesh
363  * @meshsa:     source address address in the mesh.  Same as TA, as frame is
364  *              locally originated.
365  *
366  * Return the length of the 802.11 (does not include a mesh control header)
367  */
368 int ieee80211_fill_mesh_addresses(struct ieee80211_hdr *hdr, __le16 *fc, char
369                 *meshda, char *meshsa) {
370         if (is_multicast_ether_addr(meshda)) {
371                 *fc |= cpu_to_le16(IEEE80211_FCTL_FROMDS);
372                 /* DA TA SA */
373                 memcpy(hdr->addr1, meshda, ETH_ALEN);
374                 memcpy(hdr->addr2, meshsa, ETH_ALEN);
375                 memcpy(hdr->addr3, meshsa, ETH_ALEN);
376                 return 24;
377         } else {
378                 *fc |= cpu_to_le16(IEEE80211_FCTL_FROMDS |
379                                 IEEE80211_FCTL_TODS);
380                 /* RA TA DA SA */
381                 memset(hdr->addr1, 0, ETH_ALEN);   /* RA is resolved later */
382                 memcpy(hdr->addr2, meshsa, ETH_ALEN);
383                 memcpy(hdr->addr3, meshda, ETH_ALEN);
384                 memcpy(hdr->addr4, meshsa, ETH_ALEN);
385                 return 30;
386         }
387 }
388
389 /**
390  * ieee80211_new_mesh_header - create a new mesh header
391  * @meshhdr:    uninitialized mesh header
392  * @sdata:      mesh interface to be used
393  * @addr4:      addr4 of the mesh frame (1st in ae header)
394  *              may be NULL
395  * @addr5:      addr5 of the mesh frame (1st or 2nd in ae header)
396  *              may be NULL unless addr6 is present
397  * @addr6:      addr6 of the mesh frame (2nd or 3rd in ae header)
398  *              may be NULL unless addr5 is present
399  *
400  * Return the header length.
401  */
402 int ieee80211_new_mesh_header(struct ieee80211s_hdr *meshhdr,
403                 struct ieee80211_sub_if_data *sdata, char *addr4,
404                 char *addr5, char *addr6)
405 {
406         int aelen = 0;
407         memset(meshhdr, 0, sizeof(meshhdr));
408         meshhdr->ttl = sdata->u.mesh.mshcfg.dot11MeshTTL;
409         put_unaligned(cpu_to_le32(sdata->u.mesh.mesh_seqnum), &meshhdr->seqnum);
410         sdata->u.mesh.mesh_seqnum++;
411         if (addr4) {
412                 meshhdr->flags |= MESH_FLAGS_AE_A4;
413                 aelen += ETH_ALEN;
414                 memcpy(meshhdr->eaddr1, addr4, ETH_ALEN);
415         }
416         if (addr5 && addr6) {
417                 meshhdr->flags |= MESH_FLAGS_AE_A5_A6;
418                 aelen += 2 * ETH_ALEN;
419                 if (!addr4) {
420                         memcpy(meshhdr->eaddr1, addr5, ETH_ALEN);
421                         memcpy(meshhdr->eaddr2, addr6, ETH_ALEN);
422                 } else {
423                         memcpy(meshhdr->eaddr2, addr5, ETH_ALEN);
424                         memcpy(meshhdr->eaddr3, addr6, ETH_ALEN);
425                 }
426         }
427         return 6 + aelen;
428 }
429
430 static void ieee80211_mesh_housekeeping(struct ieee80211_sub_if_data *sdata,
431                            struct ieee80211_if_mesh *ifmsh)
432 {
433         bool free_plinks;
434
435 #ifdef CONFIG_MAC80211_VERBOSE_DEBUG
436         printk(KERN_DEBUG "%s: running mesh housekeeping\n",
437                sdata->dev->name);
438 #endif
439
440         ieee80211_sta_expire(sdata, IEEE80211_MESH_PEER_INACTIVITY_LIMIT);
441         mesh_path_expire(sdata);
442
443         free_plinks = mesh_plink_availables(sdata);
444         if (free_plinks != sdata->u.mesh.accepting_plinks)
445                 ieee80211_bss_info_change_notify(sdata, BSS_CHANGED_BEACON);
446
447         mod_timer(&ifmsh->housekeeping_timer,
448                   round_jiffies(jiffies + IEEE80211_MESH_HOUSEKEEPING_INTERVAL));
449 }
450
451 #ifdef CONFIG_PM
452 void ieee80211_mesh_quiesce(struct ieee80211_sub_if_data *sdata)
453 {
454         struct ieee80211_if_mesh *ifmsh = &sdata->u.mesh;
455
456         /* might restart the timer but that doesn't matter */
457         cancel_work_sync(&ifmsh->work);
458
459         /* use atomic bitops in case both timers fire at the same time */
460
461         if (del_timer_sync(&ifmsh->housekeeping_timer))
462                 set_bit(TMR_RUNNING_HK, &ifmsh->timers_running);
463         if (del_timer_sync(&ifmsh->mesh_path_timer))
464                 set_bit(TMR_RUNNING_MP, &ifmsh->timers_running);
465 }
466
467 void ieee80211_mesh_restart(struct ieee80211_sub_if_data *sdata)
468 {
469         struct ieee80211_if_mesh *ifmsh = &sdata->u.mesh;
470
471         if (test_and_clear_bit(TMR_RUNNING_HK, &ifmsh->timers_running))
472                 add_timer(&ifmsh->housekeeping_timer);
473         if (test_and_clear_bit(TMR_RUNNING_MP, &ifmsh->timers_running))
474                 add_timer(&ifmsh->mesh_path_timer);
475 }
476 #endif
477
478 void ieee80211_start_mesh(struct ieee80211_sub_if_data *sdata)
479 {
480         struct ieee80211_if_mesh *ifmsh = &sdata->u.mesh;
481         struct ieee80211_local *local = sdata->local;
482
483         set_bit(MESH_WORK_HOUSEKEEPING, &ifmsh->wrkq_flags);
484         ieee80211_queue_work(&local->hw, &ifmsh->work);
485         sdata->vif.bss_conf.beacon_int = MESH_DEFAULT_BEACON_INTERVAL;
486         ieee80211_bss_info_change_notify(sdata, BSS_CHANGED_BEACON |
487                                                 BSS_CHANGED_BEACON_ENABLED |
488                                                 BSS_CHANGED_BEACON_INT);
489 }
490
491 void ieee80211_stop_mesh(struct ieee80211_sub_if_data *sdata)
492 {
493         del_timer_sync(&sdata->u.mesh.housekeeping_timer);
494         /*
495          * If the timer fired while we waited for it, it will have
496          * requeued the work. Now the work will be running again
497          * but will not rearm the timer again because it checks
498          * whether the interface is running, which, at this point,
499          * it no longer is.
500          */
501         cancel_work_sync(&sdata->u.mesh.work);
502
503         /*
504          * When we get here, the interface is marked down.
505          * Call synchronize_rcu() to wait for the RX path
506          * should it be using the interface and enqueuing
507          * frames at this very time on another CPU.
508          */
509         rcu_barrier(); /* Wait for RX path and call_rcu()'s */
510         skb_queue_purge(&sdata->u.mesh.skb_queue);
511 }
512
513 static void ieee80211_mesh_rx_bcn_presp(struct ieee80211_sub_if_data *sdata,
514                                         u16 stype,
515                                         struct ieee80211_mgmt *mgmt,
516                                         size_t len,
517                                         struct ieee80211_rx_status *rx_status)
518 {
519         struct ieee80211_local *local = sdata->local;
520         struct ieee802_11_elems elems;
521         struct ieee80211_channel *channel;
522         u32 supp_rates = 0;
523         size_t baselen;
524         int freq;
525         enum ieee80211_band band = rx_status->band;
526
527         /* ignore ProbeResp to foreign address */
528         if (stype == IEEE80211_STYPE_PROBE_RESP &&
529             compare_ether_addr(mgmt->da, sdata->dev->dev_addr))
530                 return;
531
532         baselen = (u8 *) mgmt->u.probe_resp.variable - (u8 *) mgmt;
533         if (baselen > len)
534                 return;
535
536         ieee802_11_parse_elems(mgmt->u.probe_resp.variable, len - baselen,
537                                &elems);
538
539         if (elems.ds_params && elems.ds_params_len == 1)
540                 freq = ieee80211_channel_to_frequency(elems.ds_params[0]);
541         else
542                 freq = rx_status->freq;
543
544         channel = ieee80211_get_channel(local->hw.wiphy, freq);
545
546         if (!channel || channel->flags & IEEE80211_CHAN_DISABLED)
547                 return;
548
549         if (elems.mesh_id && elems.mesh_config &&
550             mesh_matches_local(&elems, sdata)) {
551                 supp_rates = ieee80211_sta_get_rates(local, &elems, band);
552
553                 mesh_neighbour_update(mgmt->sa, supp_rates, sdata,
554                                       mesh_peer_accepts_plinks(&elems));
555         }
556 }
557
558 static void ieee80211_mesh_rx_mgmt_action(struct ieee80211_sub_if_data *sdata,
559                                           struct ieee80211_mgmt *mgmt,
560                                           size_t len,
561                                           struct ieee80211_rx_status *rx_status)
562 {
563         switch (mgmt->u.action.category) {
564         case PLINK_CATEGORY:
565                 mesh_rx_plink_frame(sdata, mgmt, len, rx_status);
566                 break;
567         case MESH_PATH_SEL_CATEGORY:
568                 mesh_rx_path_sel_frame(sdata, mgmt, len);
569                 break;
570         }
571 }
572
573 static void ieee80211_mesh_rx_queued_mgmt(struct ieee80211_sub_if_data *sdata,
574                                           struct sk_buff *skb)
575 {
576         struct ieee80211_rx_status *rx_status;
577         struct ieee80211_if_mesh *ifmsh;
578         struct ieee80211_mgmt *mgmt;
579         u16 stype;
580
581         ifmsh = &sdata->u.mesh;
582
583         rx_status = IEEE80211_SKB_RXCB(skb);
584         mgmt = (struct ieee80211_mgmt *) skb->data;
585         stype = le16_to_cpu(mgmt->frame_control) & IEEE80211_FCTL_STYPE;
586
587         switch (stype) {
588         case IEEE80211_STYPE_PROBE_RESP:
589         case IEEE80211_STYPE_BEACON:
590                 ieee80211_mesh_rx_bcn_presp(sdata, stype, mgmt, skb->len,
591                                             rx_status);
592                 break;
593         case IEEE80211_STYPE_ACTION:
594                 ieee80211_mesh_rx_mgmt_action(sdata, mgmt, skb->len, rx_status);
595                 break;
596         }
597
598         kfree_skb(skb);
599 }
600
601 static void ieee80211_mesh_work(struct work_struct *work)
602 {
603         struct ieee80211_sub_if_data *sdata =
604                 container_of(work, struct ieee80211_sub_if_data, u.mesh.work);
605         struct ieee80211_local *local = sdata->local;
606         struct ieee80211_if_mesh *ifmsh = &sdata->u.mesh;
607         struct sk_buff *skb;
608
609         if (!netif_running(sdata->dev))
610                 return;
611
612         if (local->scanning)
613                 return;
614
615         while ((skb = skb_dequeue(&ifmsh->skb_queue)))
616                 ieee80211_mesh_rx_queued_mgmt(sdata, skb);
617
618         if (ifmsh->preq_queue_len &&
619             time_after(jiffies,
620                        ifmsh->last_preq + msecs_to_jiffies(ifmsh->mshcfg.dot11MeshHWMPpreqMinInterval)))
621                 mesh_path_start_discovery(sdata);
622
623         if (test_and_clear_bit(MESH_WORK_GROW_MPATH_TABLE, &ifmsh->wrkq_flags))
624                 mesh_mpath_table_grow();
625
626         if (test_and_clear_bit(MESH_WORK_GROW_MPATH_TABLE, &ifmsh->wrkq_flags))
627                 mesh_mpp_table_grow();
628
629         if (test_and_clear_bit(MESH_WORK_HOUSEKEEPING, &ifmsh->wrkq_flags))
630                 ieee80211_mesh_housekeeping(sdata, ifmsh);
631 }
632
633 void ieee80211_mesh_notify_scan_completed(struct ieee80211_local *local)
634 {
635         struct ieee80211_sub_if_data *sdata;
636
637         rcu_read_lock();
638         list_for_each_entry_rcu(sdata, &local->interfaces, list)
639                 if (ieee80211_vif_is_mesh(&sdata->vif))
640                         ieee80211_queue_work(&local->hw, &sdata->u.mesh.work);
641         rcu_read_unlock();
642 }
643
644 void ieee80211_mesh_init_sdata(struct ieee80211_sub_if_data *sdata)
645 {
646         struct ieee80211_if_mesh *ifmsh = &sdata->u.mesh;
647
648         INIT_WORK(&ifmsh->work, ieee80211_mesh_work);
649         setup_timer(&ifmsh->housekeeping_timer,
650                     ieee80211_mesh_housekeeping_timer,
651                     (unsigned long) sdata);
652         skb_queue_head_init(&sdata->u.mesh.skb_queue);
653
654         ifmsh->mshcfg.dot11MeshRetryTimeout = MESH_RET_T;
655         ifmsh->mshcfg.dot11MeshConfirmTimeout = MESH_CONF_T;
656         ifmsh->mshcfg.dot11MeshHoldingTimeout = MESH_HOLD_T;
657         ifmsh->mshcfg.dot11MeshMaxRetries = MESH_MAX_RETR;
658         ifmsh->mshcfg.dot11MeshTTL = MESH_TTL;
659         ifmsh->mshcfg.auto_open_plinks = true;
660         ifmsh->mshcfg.dot11MeshMaxPeerLinks =
661                 MESH_MAX_ESTAB_PLINKS;
662         ifmsh->mshcfg.dot11MeshHWMPactivePathTimeout =
663                 MESH_PATH_TIMEOUT;
664         ifmsh->mshcfg.dot11MeshHWMPpreqMinInterval =
665                 MESH_PREQ_MIN_INT;
666         ifmsh->mshcfg.dot11MeshHWMPnetDiameterTraversalTime =
667                 MESH_DIAM_TRAVERSAL_TIME;
668         ifmsh->mshcfg.dot11MeshHWMPmaxPREQretries =
669                 MESH_MAX_PREQ_RETRIES;
670         ifmsh->mshcfg.path_refresh_time =
671                 MESH_PATH_REFRESH_TIME;
672         ifmsh->mshcfg.min_discovery_timeout =
673                 MESH_MIN_DISCOVERY_TIMEOUT;
674         ifmsh->accepting_plinks = true;
675         ifmsh->preq_id = 0;
676         ifmsh->dsn = 0;
677         atomic_set(&ifmsh->mpaths, 0);
678         mesh_rmc_init(sdata);
679         ifmsh->last_preq = jiffies;
680         /* Allocate all mesh structures when creating the first mesh interface. */
681         if (!mesh_allocated)
682                 ieee80211s_init();
683         mesh_ids_set_default(ifmsh);
684         setup_timer(&ifmsh->mesh_path_timer,
685                     ieee80211_mesh_path_timer,
686                     (unsigned long) sdata);
687         INIT_LIST_HEAD(&ifmsh->preq_queue.list);
688         spin_lock_init(&ifmsh->mesh_preq_queue_lock);
689 }
690
691 ieee80211_rx_result
692 ieee80211_mesh_rx_mgmt(struct ieee80211_sub_if_data *sdata, struct sk_buff *skb)
693 {
694         struct ieee80211_local *local = sdata->local;
695         struct ieee80211_if_mesh *ifmsh = &sdata->u.mesh;
696         struct ieee80211_mgmt *mgmt;
697         u16 fc;
698
699         if (skb->len < 24)
700                 return RX_DROP_MONITOR;
701
702         mgmt = (struct ieee80211_mgmt *) skb->data;
703         fc = le16_to_cpu(mgmt->frame_control);
704
705         switch (fc & IEEE80211_FCTL_STYPE) {
706         case IEEE80211_STYPE_ACTION:
707                 if (skb->len < IEEE80211_MIN_ACTION_SIZE)
708                         return RX_DROP_MONITOR;
709                 /* fall through */
710         case IEEE80211_STYPE_PROBE_RESP:
711         case IEEE80211_STYPE_BEACON:
712                 skb_queue_tail(&ifmsh->skb_queue, skb);
713                 ieee80211_queue_work(&local->hw, &ifmsh->work);
714                 return RX_QUEUED;
715         }
716
717         return RX_CONTINUE;
718 }