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Luis Carlos Cobo2e3c8732008-02-23 15:17:09 +01001/*
Rui Paulo264d9b72009-11-09 23:46:58 +00002 * Copyright (c) 2008, 2009 open80211s Ltd.
Luis Carlos Cobo2e3c8732008-02-23 15:17:09 +01003 * 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
Luis Carlos Cobo51cedda2008-04-23 12:15:29 -070011#include <asm/unaligned.h>
Luis Carlos Cobo2e3c8732008-02-23 15:17:09 +010012#include "ieee80211_i.h"
13#include "mesh.h"
14
Johannes Berg472dbc42008-09-11 00:01:49 +020015#define IEEE80211_MESH_PEER_INACTIVITY_LIMIT (1800 * HZ)
16#define IEEE80211_MESH_HOUSEKEEPING_INTERVAL (60 * HZ)
Rui Pauloe304bfd2009-11-09 23:46:56 +000017#define IEEE80211_MESH_RANN_INTERVAL (1 * HZ)
Johannes Berg472dbc42008-09-11 00:01:49 +020018
Rui Paulo34917072009-11-09 23:46:39 +000019#define MESHCONF_PP_OFFSET 0 /* Path Selection Protocol */
20#define MESHCONF_PM_OFFSET 1 /* Path Selection Metric */
21#define MESHCONF_CC_OFFSET 2 /* Congestion Control Mode */
22#define MESHCONF_SP_OFFSET 3 /* Synchronization Protocol */
23#define MESHCONF_AUTH_OFFSET 4 /* Authentication Protocol */
24#define MESHCONF_CAPAB_OFFSET 6
25#define MESHCONF_CAPAB_ACCEPT_PLINKS 0x01
26#define MESHCONF_CAPAB_FORWARDING 0x08
Luis Carlos Cobo2e3c8732008-02-23 15:17:09 +010027
Johannes Berg5bb644a2009-05-17 11:40:42 +020028#define TMR_RUNNING_HK 0
29#define TMR_RUNNING_MP 1
Rui Pauloe304bfd2009-11-09 23:46:56 +000030#define TMR_RUNNING_MPR 2
Johannes Berg5bb644a2009-05-17 11:40:42 +020031
Luis Carlos Cobo2e3c8732008-02-23 15:17:09 +010032int mesh_allocated;
33static struct kmem_cache *rm_cache;
34
35void ieee80211s_init(void)
36{
37 mesh_pathtbl_init();
38 mesh_allocated = 1;
39 rm_cache = kmem_cache_create("mesh_rmc", sizeof(struct rmc_entry),
40 0, 0, NULL);
41}
42
43void ieee80211s_stop(void)
44{
45 mesh_pathtbl_unregister();
46 kmem_cache_destroy(rm_cache);
47}
48
Johannes Berg472dbc42008-09-11 00:01:49 +020049static void ieee80211_mesh_housekeeping_timer(unsigned long data)
50{
51 struct ieee80211_sub_if_data *sdata = (void *) data;
52 struct ieee80211_local *local = sdata->local;
53 struct ieee80211_if_mesh *ifmsh = &sdata->u.mesh;
54
Rui Paulo6b9ac442009-10-20 21:21:48 +010055 set_bit(MESH_WORK_HOUSEKEEPING, &ifmsh->wrkq_flags);
Johannes Berg5bb644a2009-05-17 11:40:42 +020056
57 if (local->quiescing) {
58 set_bit(TMR_RUNNING_HK, &ifmsh->timers_running);
59 return;
60 }
61
Luis R. Rodriguezc03e20f2009-08-04 15:06:26 -070062 ieee80211_queue_work(&local->hw, &ifmsh->work);
Johannes Berg472dbc42008-09-11 00:01:49 +020063}
64
Luis Carlos Cobo2e3c8732008-02-23 15:17:09 +010065/**
66 * mesh_matches_local - check if the config of a mesh point matches ours
67 *
68 * @ie: information elements of a management frame from the mesh peer
Jasper Bryant-Greenef698d852008-08-03 12:04:37 +120069 * @sdata: local mesh subif
Luis Carlos Cobo2e3c8732008-02-23 15:17:09 +010070 *
71 * This function checks if the mesh configuration of a mesh point matches the
72 * local mesh configuration, i.e. if both nodes belong to the same mesh network.
73 */
Jasper Bryant-Greenef698d852008-08-03 12:04:37 +120074bool mesh_matches_local(struct ieee802_11_elems *ie, struct ieee80211_sub_if_data *sdata)
Luis Carlos Cobo2e3c8732008-02-23 15:17:09 +010075{
Johannes Berg472dbc42008-09-11 00:01:49 +020076 struct ieee80211_if_mesh *ifmsh = &sdata->u.mesh;
Luis Carlos Cobo2e3c8732008-02-23 15:17:09 +010077
Luis Carlos Cobo2e3c8732008-02-23 15:17:09 +010078 /*
79 * As support for each feature is added, check for matching
80 * - On mesh config capabilities
81 * - Power Save Support En
82 * - Sync support enabled
83 * - Sync support active
84 * - Sync support required from peer
85 * - MDA enabled
86 * - Power management control on fc
87 */
Johannes Berg472dbc42008-09-11 00:01:49 +020088 if (ifmsh->mesh_id_len == ie->mesh_id_len &&
89 memcmp(ifmsh->mesh_id, ie->mesh_id, ie->mesh_id_len) == 0 &&
Rui Paulo34917072009-11-09 23:46:39 +000090 (ifmsh->mesh_pp_id == *(ie->mesh_config + MESHCONF_PP_OFFSET))&&
91 (ifmsh->mesh_pm_id == *(ie->mesh_config + MESHCONF_PM_OFFSET))&&
92 (ifmsh->mesh_cc_id == *(ie->mesh_config + MESHCONF_CC_OFFSET))&&
93 (ifmsh->mesh_sp_id == *(ie->mesh_config + MESHCONF_SP_OFFSET))&&
94 (ifmsh->mesh_auth_id == *(ie->mesh_config +
95 MESHCONF_AUTH_OFFSET)))
Luis Carlos Cobo2e3c8732008-02-23 15:17:09 +010096 return true;
97
98 return false;
99}
100
101/**
102 * mesh_peer_accepts_plinks - check if an mp is willing to establish peer links
103 *
104 * @ie: information elements of a management frame from the mesh peer
Luis Carlos Cobo2e3c8732008-02-23 15:17:09 +0100105 */
Jasper Bryant-Greenef698d852008-08-03 12:04:37 +1200106bool mesh_peer_accepts_plinks(struct ieee802_11_elems *ie)
Luis Carlos Cobo2e3c8732008-02-23 15:17:09 +0100107{
Rui Paulo34917072009-11-09 23:46:39 +0000108 return (*(ie->mesh_config + MESHCONF_CAPAB_OFFSET) &
109 MESHCONF_CAPAB_ACCEPT_PLINKS) != 0;
Luis Carlos Cobo2e3c8732008-02-23 15:17:09 +0100110}
111
112/**
113 * mesh_accept_plinks_update: update accepting_plink in local mesh beacons
114 *
Johannes Bergd0709a62008-02-25 16:27:46 +0100115 * @sdata: mesh interface in which mesh beacons are going to be updated
Luis Carlos Cobo2e3c8732008-02-23 15:17:09 +0100116 */
Johannes Bergd0709a62008-02-25 16:27:46 +0100117void mesh_accept_plinks_update(struct ieee80211_sub_if_data *sdata)
Luis Carlos Cobo2e3c8732008-02-23 15:17:09 +0100118{
Luis Carlos Cobo2e3c8732008-02-23 15:17:09 +0100119 bool free_plinks;
120
121 /* In case mesh_plink_free_count > 0 and mesh_plinktbl_capacity == 0,
122 * the mesh interface might be able to establish plinks with peers that
Luis Carlos Cobob4e08ea2008-02-29 15:46:08 -0800123 * are already on the table but are not on PLINK_ESTAB state. However,
124 * in general the mesh interface is not accepting peer link requests
125 * from new peers, and that must be reflected in the beacon
Luis Carlos Cobo2e3c8732008-02-23 15:17:09 +0100126 */
127 free_plinks = mesh_plink_availables(sdata);
128
Johannes Berg472dbc42008-09-11 00:01:49 +0200129 if (free_plinks != sdata->u.mesh.accepting_plinks)
130 ieee80211_mesh_housekeeping_timer((unsigned long) sdata);
Luis Carlos Cobo2e3c8732008-02-23 15:17:09 +0100131}
132
Johannes Berg472dbc42008-09-11 00:01:49 +0200133void mesh_ids_set_default(struct ieee80211_if_mesh *sta)
Luis Carlos Cobo2e3c8732008-02-23 15:17:09 +0100134{
Rui Paulo34917072009-11-09 23:46:39 +0000135 sta->mesh_pp_id = 0; /* HWMP */
136 sta->mesh_pm_id = 0; /* Airtime */
137 sta->mesh_cc_id = 0; /* Disabled */
138 sta->mesh_sp_id = 0; /* Neighbor Offset */
139 sta->mesh_auth_id = 0; /* Disabled */
Luis Carlos Cobo2e3c8732008-02-23 15:17:09 +0100140}
141
Jasper Bryant-Greenef698d852008-08-03 12:04:37 +1200142int mesh_rmc_init(struct ieee80211_sub_if_data *sdata)
Luis Carlos Cobo2e3c8732008-02-23 15:17:09 +0100143{
Luis Carlos Cobo2e3c8732008-02-23 15:17:09 +0100144 int i;
145
Johannes Berg472dbc42008-09-11 00:01:49 +0200146 sdata->u.mesh.rmc = kmalloc(sizeof(struct mesh_rmc), GFP_KERNEL);
147 if (!sdata->u.mesh.rmc)
Luis Carlos Cobo2e3c8732008-02-23 15:17:09 +0100148 return -ENOMEM;
Johannes Berg472dbc42008-09-11 00:01:49 +0200149 sdata->u.mesh.rmc->idx_mask = RMC_BUCKETS - 1;
Luis Carlos Cobo2e3c8732008-02-23 15:17:09 +0100150 for (i = 0; i < RMC_BUCKETS; i++)
Johannes Berg472dbc42008-09-11 00:01:49 +0200151 INIT_LIST_HEAD(&sdata->u.mesh.rmc->bucket[i].list);
Luis Carlos Cobo2e3c8732008-02-23 15:17:09 +0100152 return 0;
153}
154
Jasper Bryant-Greenef698d852008-08-03 12:04:37 +1200155void mesh_rmc_free(struct ieee80211_sub_if_data *sdata)
Luis Carlos Cobo2e3c8732008-02-23 15:17:09 +0100156{
Johannes Berg472dbc42008-09-11 00:01:49 +0200157 struct mesh_rmc *rmc = sdata->u.mesh.rmc;
Luis Carlos Cobo2e3c8732008-02-23 15:17:09 +0100158 struct rmc_entry *p, *n;
159 int i;
160
Johannes Berg472dbc42008-09-11 00:01:49 +0200161 if (!sdata->u.mesh.rmc)
Luis Carlos Cobo2e3c8732008-02-23 15:17:09 +0100162 return;
163
164 for (i = 0; i < RMC_BUCKETS; i++)
165 list_for_each_entry_safe(p, n, &rmc->bucket[i].list, list) {
166 list_del(&p->list);
167 kmem_cache_free(rm_cache, p);
168 }
169
170 kfree(rmc);
Johannes Berg472dbc42008-09-11 00:01:49 +0200171 sdata->u.mesh.rmc = NULL;
Luis Carlos Cobo2e3c8732008-02-23 15:17:09 +0100172}
173
174/**
175 * mesh_rmc_check - Check frame in recent multicast cache and add if absent.
176 *
177 * @sa: source address
178 * @mesh_hdr: mesh_header
179 *
180 * Returns: 0 if the frame is not in the cache, nonzero otherwise.
181 *
182 * Checks using the source address and the mesh sequence number if we have
183 * received this frame lately. If the frame is not in the cache, it is added to
184 * it.
185 */
186int mesh_rmc_check(u8 *sa, struct ieee80211s_hdr *mesh_hdr,
Jasper Bryant-Greenef698d852008-08-03 12:04:37 +1200187 struct ieee80211_sub_if_data *sdata)
Luis Carlos Cobo2e3c8732008-02-23 15:17:09 +0100188{
Johannes Berg472dbc42008-09-11 00:01:49 +0200189 struct mesh_rmc *rmc = sdata->u.mesh.rmc;
Luis Carlos Cobo2e3c8732008-02-23 15:17:09 +0100190 u32 seqnum = 0;
191 int entries = 0;
192 u8 idx;
193 struct rmc_entry *p, *n;
194
195 /* Don't care about endianness since only match matters */
Luis Carlos Cobo51cedda2008-04-23 12:15:29 -0700196 memcpy(&seqnum, &mesh_hdr->seqnum, sizeof(mesh_hdr->seqnum));
197 idx = le32_to_cpu(mesh_hdr->seqnum) & rmc->idx_mask;
Luis Carlos Cobo2e3c8732008-02-23 15:17:09 +0100198 list_for_each_entry_safe(p, n, &rmc->bucket[idx].list, list) {
199 ++entries;
200 if (time_after(jiffies, p->exp_time) ||
201 (entries == RMC_QUEUE_MAX_LEN)) {
202 list_del(&p->list);
203 kmem_cache_free(rm_cache, p);
204 --entries;
205 } else if ((seqnum == p->seqnum)
206 && (memcmp(sa, p->sa, ETH_ALEN) == 0))
207 return -1;
208 }
209
210 p = kmem_cache_alloc(rm_cache, GFP_ATOMIC);
211 if (!p) {
212 printk(KERN_DEBUG "o11s: could not allocate RMC entry\n");
213 return 0;
214 }
215 p->seqnum = seqnum;
216 p->exp_time = jiffies + RMC_TIMEOUT;
217 memcpy(p->sa, sa, ETH_ALEN);
218 list_add(&p->list, &rmc->bucket[idx].list);
219 return 0;
220}
221
Jasper Bryant-Greenef698d852008-08-03 12:04:37 +1200222void mesh_mgmt_ies_add(struct sk_buff *skb, struct ieee80211_sub_if_data *sdata)
Luis Carlos Cobo2e3c8732008-02-23 15:17:09 +0100223{
Jasper Bryant-Greenef698d852008-08-03 12:04:37 +1200224 struct ieee80211_local *local = sdata->local;
Luis Carlos Cobo2e3c8732008-02-23 15:17:09 +0100225 struct ieee80211_supported_band *sband;
226 u8 *pos;
227 int len, i, rate;
Rui Paulo8f2fda92009-11-09 23:46:41 +0000228 u8 neighbors;
Luis Carlos Cobo2e3c8732008-02-23 15:17:09 +0100229
230 sband = local->hw.wiphy->bands[local->hw.conf.channel->band];
231 len = sband->n_bitrates;
232 if (len > 8)
233 len = 8;
234 pos = skb_put(skb, len + 2);
235 *pos++ = WLAN_EID_SUPP_RATES;
236 *pos++ = len;
237 for (i = 0; i < len; i++) {
238 rate = sband->bitrates[i].bitrate;
239 *pos++ = (u8) (rate / 5);
240 }
241
242 if (sband->n_bitrates > len) {
243 pos = skb_put(skb, sband->n_bitrates - len + 2);
244 *pos++ = WLAN_EID_EXT_SUPP_RATES;
245 *pos++ = sband->n_bitrates - len;
246 for (i = len; i < sband->n_bitrates; i++) {
247 rate = sband->bitrates[i].bitrate;
248 *pos++ = (u8) (rate / 5);
249 }
250 }
251
Rui Paulobe125c62009-11-09 23:46:54 +0000252 if (sband->band == IEEE80211_BAND_2GHZ) {
253 pos = skb_put(skb, 2 + 1);
254 *pos++ = WLAN_EID_DS_PARAMS;
255 *pos++ = 1;
256 *pos++ = ieee80211_frequency_to_channel(local->hw.conf.channel->center_freq);
257 }
258
Johannes Berg472dbc42008-09-11 00:01:49 +0200259 pos = skb_put(skb, 2 + sdata->u.mesh.mesh_id_len);
Luis Carlos Cobo2e3c8732008-02-23 15:17:09 +0100260 *pos++ = WLAN_EID_MESH_ID;
Johannes Berg472dbc42008-09-11 00:01:49 +0200261 *pos++ = sdata->u.mesh.mesh_id_len;
262 if (sdata->u.mesh.mesh_id_len)
263 memcpy(pos, sdata->u.mesh.mesh_id, sdata->u.mesh.mesh_id_len);
Luis Carlos Cobo2e3c8732008-02-23 15:17:09 +0100264
Javier Cardona9e03fdf2009-08-20 09:21:45 -0700265 pos = skb_put(skb, 2 + IEEE80211_MESH_CONFIG_LEN);
Luis Carlos Cobo2e3c8732008-02-23 15:17:09 +0100266 *pos++ = WLAN_EID_MESH_CONFIG;
Johannes Berg1239cd52008-10-28 11:12:57 +0100267 *pos++ = IEEE80211_MESH_CONFIG_LEN;
Luis Carlos Cobo2e3c8732008-02-23 15:17:09 +0100268
269 /* Active path selection protocol ID */
Rui Paulo34917072009-11-09 23:46:39 +0000270 *pos++ = sdata->u.mesh.mesh_pp_id;
Luis Carlos Cobo2e3c8732008-02-23 15:17:09 +0100271
272 /* Active path selection metric ID */
Rui Paulo34917072009-11-09 23:46:39 +0000273 *pos++ = sdata->u.mesh.mesh_pm_id;
Luis Carlos Cobo2e3c8732008-02-23 15:17:09 +0100274
275 /* Congestion control mode identifier */
Rui Paulo34917072009-11-09 23:46:39 +0000276 *pos++ = sdata->u.mesh.mesh_cc_id;
Luis Carlos Cobo2e3c8732008-02-23 15:17:09 +0100277
Javier Cardona9e03fdf2009-08-20 09:21:45 -0700278 /* Synchronization protocol identifier */
Rui Paulo34917072009-11-09 23:46:39 +0000279 *pos++ = sdata->u.mesh.mesh_sp_id;
Luis Carlos Cobo2e3c8732008-02-23 15:17:09 +0100280
Javier Cardona9e03fdf2009-08-20 09:21:45 -0700281 /* Authentication Protocol identifier */
Rui Paulo34917072009-11-09 23:46:39 +0000282 *pos++ = sdata->u.mesh.mesh_auth_id;
Javier Cardona9e03fdf2009-08-20 09:21:45 -0700283
Rui Paulo8f2fda92009-11-09 23:46:41 +0000284 /* Mesh Formation Info - number of neighbors */
285 neighbors = atomic_read(&sdata->u.mesh.mshstats.estab_plinks);
286 /* Number of neighbor mesh STAs or 15 whichever is smaller */
287 neighbors = (neighbors > 15) ? 15 : neighbors;
288 *pos++ = neighbors << 1;
Javier Cardona9e03fdf2009-08-20 09:21:45 -0700289
Luis Carlos Cobo2e3c8732008-02-23 15:17:09 +0100290 /* Mesh capability */
Johannes Berg472dbc42008-09-11 00:01:49 +0200291 sdata->u.mesh.accepting_plinks = mesh_plink_availables(sdata);
Rui Paulo34917072009-11-09 23:46:39 +0000292 *pos = MESHCONF_CAPAB_FORWARDING;
293 *pos++ |= sdata->u.mesh.accepting_plinks ?
294 MESHCONF_CAPAB_ACCEPT_PLINKS : 0x00;
Luis Carlos Cobo2e3c8732008-02-23 15:17:09 +0100295 *pos++ = 0x00;
296
297 return;
298}
299
Jasper Bryant-Greenef698d852008-08-03 12:04:37 +1200300u32 mesh_table_hash(u8 *addr, struct ieee80211_sub_if_data *sdata, struct mesh_table *tbl)
Luis Carlos Cobo2e3c8732008-02-23 15:17:09 +0100301{
302 /* Use last four bytes of hw addr and interface index as hash index */
Jasper Bryant-Greenef698d852008-08-03 12:04:37 +1200303 return jhash_2words(*(u32 *)(addr+2), sdata->dev->ifindex, tbl->hash_rnd)
Luis Carlos Cobo2e3c8732008-02-23 15:17:09 +0100304 & tbl->hash_mask;
305}
306
Luis Carlos Cobo2e3c8732008-02-23 15:17:09 +0100307struct mesh_table *mesh_table_alloc(int size_order)
308{
309 int i;
310 struct mesh_table *newtbl;
311
312 newtbl = kmalloc(sizeof(struct mesh_table), GFP_KERNEL);
313 if (!newtbl)
314 return NULL;
315
316 newtbl->hash_buckets = kzalloc(sizeof(struct hlist_head) *
317 (1 << size_order), GFP_KERNEL);
318
319 if (!newtbl->hash_buckets) {
320 kfree(newtbl);
321 return NULL;
322 }
323
324 newtbl->hashwlock = kmalloc(sizeof(spinlock_t) *
325 (1 << size_order), GFP_KERNEL);
326 if (!newtbl->hashwlock) {
327 kfree(newtbl->hash_buckets);
328 kfree(newtbl);
329 return NULL;
330 }
331
332 newtbl->size_order = size_order;
333 newtbl->hash_mask = (1 << size_order) - 1;
334 atomic_set(&newtbl->entries, 0);
335 get_random_bytes(&newtbl->hash_rnd,
336 sizeof(newtbl->hash_rnd));
337 for (i = 0; i <= newtbl->hash_mask; i++)
338 spin_lock_init(&newtbl->hashwlock[i]);
339
340 return newtbl;
341}
342
Luis Carlos Cobo2e3c8732008-02-23 15:17:09 +0100343
344static void ieee80211_mesh_path_timer(unsigned long data)
345{
346 struct ieee80211_sub_if_data *sdata =
347 (struct ieee80211_sub_if_data *) data;
Johannes Berg472dbc42008-09-11 00:01:49 +0200348 struct ieee80211_if_mesh *ifmsh = &sdata->u.mesh;
Johannes Berg133b8222008-09-16 14:18:59 +0200349 struct ieee80211_local *local = sdata->local;
Luis Carlos Cobo2e3c8732008-02-23 15:17:09 +0100350
Johannes Berg5bb644a2009-05-17 11:40:42 +0200351 if (local->quiescing) {
352 set_bit(TMR_RUNNING_MP, &ifmsh->timers_running);
353 return;
354 }
355
Luis R. Rodriguezc03e20f2009-08-04 15:06:26 -0700356 ieee80211_queue_work(&local->hw, &ifmsh->work);
Luis Carlos Cobo2e3c8732008-02-23 15:17:09 +0100357}
358
Rui Pauloe304bfd2009-11-09 23:46:56 +0000359static void ieee80211_mesh_path_root_timer(unsigned long data)
360{
361 struct ieee80211_sub_if_data *sdata =
362 (struct ieee80211_sub_if_data *) data;
363 struct ieee80211_if_mesh *ifmsh = &sdata->u.mesh;
364 struct ieee80211_local *local = sdata->local;
365
366 set_bit(MESH_WORK_ROOT, &ifmsh->wrkq_flags);
367
368 if (local->quiescing) {
369 set_bit(TMR_RUNNING_MPR, &ifmsh->timers_running);
370 return;
371 }
372
373 ieee80211_queue_work(&local->hw, &ifmsh->work);
374}
375
Rui Paulo63c57232009-11-09 23:46:57 +0000376void ieee80211_mesh_root_setup(struct ieee80211_if_mesh *ifmsh)
377{
378 if (ifmsh->mshcfg.dot11MeshHWMPRootMode)
379 set_bit(MESH_WORK_ROOT, &ifmsh->wrkq_flags);
380 else {
381 clear_bit(MESH_WORK_ROOT, &ifmsh->wrkq_flags);
382 /* stop running timer */
383 del_timer_sync(&ifmsh->mesh_path_root_timer);
384 }
385}
386
Johannes Berg902acc72008-02-23 15:17:19 +0100387/**
Javier Cardona3c5772a2009-08-10 12:15:48 -0700388 * ieee80211_fill_mesh_addresses - fill addresses of a locally originated mesh frame
389 * @hdr: 802.11 frame header
390 * @fc: frame control field
391 * @meshda: destination address in the mesh
392 * @meshsa: source address address in the mesh. Same as TA, as frame is
393 * locally originated.
394 *
395 * Return the length of the 802.11 (does not include a mesh control header)
396 */
Johannes Berg15ff6362009-11-17 13:34:04 +0100397int ieee80211_fill_mesh_addresses(struct ieee80211_hdr *hdr, __le16 *fc,
398 const u8 *meshda, const u8 *meshsa)
399{
Javier Cardona3c5772a2009-08-10 12:15:48 -0700400 if (is_multicast_ether_addr(meshda)) {
401 *fc |= cpu_to_le16(IEEE80211_FCTL_FROMDS);
402 /* DA TA SA */
403 memcpy(hdr->addr1, meshda, ETH_ALEN);
404 memcpy(hdr->addr2, meshsa, ETH_ALEN);
405 memcpy(hdr->addr3, meshsa, ETH_ALEN);
406 return 24;
407 } else {
408 *fc |= cpu_to_le16(IEEE80211_FCTL_FROMDS |
409 IEEE80211_FCTL_TODS);
410 /* RA TA DA SA */
411 memset(hdr->addr1, 0, ETH_ALEN); /* RA is resolved later */
412 memcpy(hdr->addr2, meshsa, ETH_ALEN);
413 memcpy(hdr->addr3, meshda, ETH_ALEN);
414 memcpy(hdr->addr4, meshsa, ETH_ALEN);
415 return 30;
416 }
417}
418
419/**
Johannes Berg902acc72008-02-23 15:17:19 +0100420 * ieee80211_new_mesh_header - create a new mesh header
421 * @meshhdr: uninitialized mesh header
422 * @sdata: mesh interface to be used
Javier Cardona3c5772a2009-08-10 12:15:48 -0700423 * @addr4: addr4 of the mesh frame (1st in ae header)
424 * may be NULL
425 * @addr5: addr5 of the mesh frame (1st or 2nd in ae header)
426 * may be NULL unless addr6 is present
427 * @addr6: addr6 of the mesh frame (2nd or 3rd in ae header)
428 * may be NULL unless addr5 is present
Johannes Berg902acc72008-02-23 15:17:19 +0100429 *
430 * Return the header length.
431 */
432int ieee80211_new_mesh_header(struct ieee80211s_hdr *meshhdr,
Javier Cardona3c5772a2009-08-10 12:15:48 -0700433 struct ieee80211_sub_if_data *sdata, char *addr4,
434 char *addr5, char *addr6)
Johannes Berg902acc72008-02-23 15:17:19 +0100435{
Javier Cardona3c5772a2009-08-10 12:15:48 -0700436 int aelen = 0;
437 memset(meshhdr, 0, sizeof(meshhdr));
Johannes Berg472dbc42008-09-11 00:01:49 +0200438 meshhdr->ttl = sdata->u.mesh.mshcfg.dot11MeshTTL;
439 put_unaligned(cpu_to_le32(sdata->u.mesh.mesh_seqnum), &meshhdr->seqnum);
440 sdata->u.mesh.mesh_seqnum++;
Javier Cardona3c5772a2009-08-10 12:15:48 -0700441 if (addr4) {
442 meshhdr->flags |= MESH_FLAGS_AE_A4;
443 aelen += ETH_ALEN;
444 memcpy(meshhdr->eaddr1, addr4, ETH_ALEN);
445 }
446 if (addr5 && addr6) {
447 meshhdr->flags |= MESH_FLAGS_AE_A5_A6;
448 aelen += 2 * ETH_ALEN;
449 if (!addr4) {
450 memcpy(meshhdr->eaddr1, addr5, ETH_ALEN);
451 memcpy(meshhdr->eaddr2, addr6, ETH_ALEN);
452 } else {
453 memcpy(meshhdr->eaddr2, addr5, ETH_ALEN);
454 memcpy(meshhdr->eaddr3, addr6, ETH_ALEN);
455 }
456 }
457 return 6 + aelen;
Johannes Berg902acc72008-02-23 15:17:19 +0100458}
459
Johannes Berg472dbc42008-09-11 00:01:49 +0200460static void ieee80211_mesh_housekeeping(struct ieee80211_sub_if_data *sdata,
461 struct ieee80211_if_mesh *ifmsh)
462{
463 bool free_plinks;
464
465#ifdef CONFIG_MAC80211_VERBOSE_DEBUG
466 printk(KERN_DEBUG "%s: running mesh housekeeping\n",
467 sdata->dev->name);
468#endif
469
470 ieee80211_sta_expire(sdata, IEEE80211_MESH_PEER_INACTIVITY_LIMIT);
471 mesh_path_expire(sdata);
472
473 free_plinks = mesh_plink_availables(sdata);
474 if (free_plinks != sdata->u.mesh.accepting_plinks)
Johannes Berg2d0ddec2009-04-23 16:13:26 +0200475 ieee80211_bss_info_change_notify(sdata, BSS_CHANGED_BEACON);
Johannes Berg472dbc42008-09-11 00:01:49 +0200476
Johannes Berg472dbc42008-09-11 00:01:49 +0200477 mod_timer(&ifmsh->housekeeping_timer,
478 round_jiffies(jiffies + IEEE80211_MESH_HOUSEKEEPING_INTERVAL));
479}
480
Rui Pauloe304bfd2009-11-09 23:46:56 +0000481static void ieee80211_mesh_rootpath(struct ieee80211_sub_if_data *sdata)
482{
483 struct ieee80211_if_mesh *ifmsh = &sdata->u.mesh;
484
485 mesh_path_tx_root_frame(sdata);
486 mod_timer(&ifmsh->mesh_path_root_timer,
487 round_jiffies(jiffies + IEEE80211_MESH_RANN_INTERVAL));
488}
489
Johannes Berg5bb644a2009-05-17 11:40:42 +0200490#ifdef CONFIG_PM
491void ieee80211_mesh_quiesce(struct ieee80211_sub_if_data *sdata)
492{
493 struct ieee80211_if_mesh *ifmsh = &sdata->u.mesh;
494
495 /* might restart the timer but that doesn't matter */
496 cancel_work_sync(&ifmsh->work);
497
498 /* use atomic bitops in case both timers fire at the same time */
499
500 if (del_timer_sync(&ifmsh->housekeeping_timer))
501 set_bit(TMR_RUNNING_HK, &ifmsh->timers_running);
502 if (del_timer_sync(&ifmsh->mesh_path_timer))
503 set_bit(TMR_RUNNING_MP, &ifmsh->timers_running);
Rui Pauloe304bfd2009-11-09 23:46:56 +0000504 if (del_timer_sync(&ifmsh->mesh_path_root_timer))
505 set_bit(TMR_RUNNING_MPR, &ifmsh->timers_running);
Johannes Berg5bb644a2009-05-17 11:40:42 +0200506}
507
508void ieee80211_mesh_restart(struct ieee80211_sub_if_data *sdata)
509{
510 struct ieee80211_if_mesh *ifmsh = &sdata->u.mesh;
511
512 if (test_and_clear_bit(TMR_RUNNING_HK, &ifmsh->timers_running))
513 add_timer(&ifmsh->housekeeping_timer);
514 if (test_and_clear_bit(TMR_RUNNING_MP, &ifmsh->timers_running))
515 add_timer(&ifmsh->mesh_path_timer);
Rui Pauloe304bfd2009-11-09 23:46:56 +0000516 if (test_and_clear_bit(TMR_RUNNING_MPR, &ifmsh->timers_running))
517 add_timer(&ifmsh->mesh_path_root_timer);
Rui Paulo63c57232009-11-09 23:46:57 +0000518 ieee80211_mesh_root_setup(ifmsh);
Johannes Berg5bb644a2009-05-17 11:40:42 +0200519}
520#endif
Johannes Berg472dbc42008-09-11 00:01:49 +0200521
522void ieee80211_start_mesh(struct ieee80211_sub_if_data *sdata)
523{
524 struct ieee80211_if_mesh *ifmsh = &sdata->u.mesh;
525 struct ieee80211_local *local = sdata->local;
526
Rui Paulo6b9ac442009-10-20 21:21:48 +0100527 set_bit(MESH_WORK_HOUSEKEEPING, &ifmsh->wrkq_flags);
Rui Paulo63c57232009-11-09 23:46:57 +0000528 ieee80211_mesh_root_setup(ifmsh);
Javier Cardona18889232009-08-10 12:15:52 -0700529 ieee80211_queue_work(&local->hw, &ifmsh->work);
Javier Cardona5b365832009-08-10 12:15:51 -0700530 sdata->vif.bss_conf.beacon_int = MESH_DEFAULT_BEACON_INTERVAL;
Johannes Berg2d0ddec2009-04-23 16:13:26 +0200531 ieee80211_bss_info_change_notify(sdata, BSS_CHANGED_BEACON |
Javier Cardona5b365832009-08-10 12:15:51 -0700532 BSS_CHANGED_BEACON_ENABLED |
533 BSS_CHANGED_BEACON_INT);
Johannes Berg472dbc42008-09-11 00:01:49 +0200534}
535
536void ieee80211_stop_mesh(struct ieee80211_sub_if_data *sdata)
537{
538 del_timer_sync(&sdata->u.mesh.housekeeping_timer);
Rui Pauloe304bfd2009-11-09 23:46:56 +0000539 del_timer_sync(&sdata->u.mesh.mesh_path_root_timer);
Johannes Berg472dbc42008-09-11 00:01:49 +0200540 /*
Johannes Bergb7413432008-09-11 00:01:50 +0200541 * If the timer fired while we waited for it, it will have
542 * requeued the work. Now the work will be running again
543 * but will not rearm the timer again because it checks
544 * whether the interface is running, which, at this point,
545 * it no longer is.
546 */
547 cancel_work_sync(&sdata->u.mesh.work);
548
549 /*
Johannes Berg472dbc42008-09-11 00:01:49 +0200550 * When we get here, the interface is marked down.
551 * Call synchronize_rcu() to wait for the RX path
552 * should it be using the interface and enqueuing
553 * frames at this very time on another CPU.
554 */
Jesper Dangaard Brouer4a270962009-06-26 10:45:53 +0000555 rcu_barrier(); /* Wait for RX path and call_rcu()'s */
Johannes Berg472dbc42008-09-11 00:01:49 +0200556 skb_queue_purge(&sdata->u.mesh.skb_queue);
557}
558
559static void ieee80211_mesh_rx_bcn_presp(struct ieee80211_sub_if_data *sdata,
560 u16 stype,
561 struct ieee80211_mgmt *mgmt,
562 size_t len,
563 struct ieee80211_rx_status *rx_status)
564{
Johannes Bergc6a1fa12008-10-07 12:04:32 +0200565 struct ieee80211_local *local = sdata->local;
Johannes Berg472dbc42008-09-11 00:01:49 +0200566 struct ieee802_11_elems elems;
567 struct ieee80211_channel *channel;
Johannes Berg881d9482009-01-21 15:13:48 +0100568 u32 supp_rates = 0;
Johannes Berg472dbc42008-09-11 00:01:49 +0200569 size_t baselen;
570 int freq;
571 enum ieee80211_band band = rx_status->band;
572
573 /* ignore ProbeResp to foreign address */
574 if (stype == IEEE80211_STYPE_PROBE_RESP &&
575 compare_ether_addr(mgmt->da, sdata->dev->dev_addr))
576 return;
577
578 baselen = (u8 *) mgmt->u.probe_resp.variable - (u8 *) mgmt;
579 if (baselen > len)
580 return;
581
582 ieee802_11_parse_elems(mgmt->u.probe_resp.variable, len - baselen,
583 &elems);
584
585 if (elems.ds_params && elems.ds_params_len == 1)
586 freq = ieee80211_channel_to_frequency(elems.ds_params[0]);
587 else
588 freq = rx_status->freq;
589
590 channel = ieee80211_get_channel(local->hw.wiphy, freq);
591
592 if (!channel || channel->flags & IEEE80211_CHAN_DISABLED)
593 return;
594
595 if (elems.mesh_id && elems.mesh_config &&
596 mesh_matches_local(&elems, sdata)) {
597 supp_rates = ieee80211_sta_get_rates(local, &elems, band);
598
599 mesh_neighbour_update(mgmt->sa, supp_rates, sdata,
600 mesh_peer_accepts_plinks(&elems));
601 }
602}
603
604static void ieee80211_mesh_rx_mgmt_action(struct ieee80211_sub_if_data *sdata,
605 struct ieee80211_mgmt *mgmt,
606 size_t len,
607 struct ieee80211_rx_status *rx_status)
608{
609 switch (mgmt->u.action.category) {
Rui Paulo09383932009-11-09 23:46:43 +0000610 case MESH_PLINK_CATEGORY:
Johannes Berg472dbc42008-09-11 00:01:49 +0200611 mesh_rx_plink_frame(sdata, mgmt, len, rx_status);
612 break;
613 case MESH_PATH_SEL_CATEGORY:
614 mesh_rx_path_sel_frame(sdata, mgmt, len);
615 break;
616 }
617}
618
619static void ieee80211_mesh_rx_queued_mgmt(struct ieee80211_sub_if_data *sdata,
620 struct sk_buff *skb)
621{
622 struct ieee80211_rx_status *rx_status;
623 struct ieee80211_if_mesh *ifmsh;
624 struct ieee80211_mgmt *mgmt;
625 u16 stype;
626
627 ifmsh = &sdata->u.mesh;
628
Johannes Bergf1d58c22009-06-17 13:13:00 +0200629 rx_status = IEEE80211_SKB_RXCB(skb);
Johannes Berg472dbc42008-09-11 00:01:49 +0200630 mgmt = (struct ieee80211_mgmt *) skb->data;
631 stype = le16_to_cpu(mgmt->frame_control) & IEEE80211_FCTL_STYPE;
632
633 switch (stype) {
634 case IEEE80211_STYPE_PROBE_RESP:
635 case IEEE80211_STYPE_BEACON:
636 ieee80211_mesh_rx_bcn_presp(sdata, stype, mgmt, skb->len,
637 rx_status);
638 break;
639 case IEEE80211_STYPE_ACTION:
640 ieee80211_mesh_rx_mgmt_action(sdata, mgmt, skb->len, rx_status);
641 break;
642 }
643
644 kfree_skb(skb);
645}
646
647static void ieee80211_mesh_work(struct work_struct *work)
648{
649 struct ieee80211_sub_if_data *sdata =
650 container_of(work, struct ieee80211_sub_if_data, u.mesh.work);
651 struct ieee80211_local *local = sdata->local;
652 struct ieee80211_if_mesh *ifmsh = &sdata->u.mesh;
653 struct sk_buff *skb;
654
655 if (!netif_running(sdata->dev))
656 return;
657
Helmut Schaafbe9c422009-07-23 12:14:04 +0200658 if (local->scanning)
Johannes Berg472dbc42008-09-11 00:01:49 +0200659 return;
660
661 while ((skb = skb_dequeue(&ifmsh->skb_queue)))
662 ieee80211_mesh_rx_queued_mgmt(sdata, skb);
663
664 if (ifmsh->preq_queue_len &&
665 time_after(jiffies,
666 ifmsh->last_preq + msecs_to_jiffies(ifmsh->mshcfg.dot11MeshHWMPpreqMinInterval)))
667 mesh_path_start_discovery(sdata);
668
Javier Cardona18889232009-08-10 12:15:52 -0700669 if (test_and_clear_bit(MESH_WORK_GROW_MPATH_TABLE, &ifmsh->wrkq_flags))
670 mesh_mpath_table_grow();
671
672 if (test_and_clear_bit(MESH_WORK_GROW_MPATH_TABLE, &ifmsh->wrkq_flags))
673 mesh_mpp_table_grow();
674
675 if (test_and_clear_bit(MESH_WORK_HOUSEKEEPING, &ifmsh->wrkq_flags))
Johannes Berg472dbc42008-09-11 00:01:49 +0200676 ieee80211_mesh_housekeeping(sdata, ifmsh);
Rui Pauloe304bfd2009-11-09 23:46:56 +0000677
678 if (test_and_clear_bit(MESH_WORK_ROOT, &ifmsh->wrkq_flags))
679 ieee80211_mesh_rootpath(sdata);
Johannes Berg472dbc42008-09-11 00:01:49 +0200680}
681
682void ieee80211_mesh_notify_scan_completed(struct ieee80211_local *local)
683{
684 struct ieee80211_sub_if_data *sdata;
685
686 rcu_read_lock();
687 list_for_each_entry_rcu(sdata, &local->interfaces, list)
688 if (ieee80211_vif_is_mesh(&sdata->vif))
Luis R. Rodriguezc03e20f2009-08-04 15:06:26 -0700689 ieee80211_queue_work(&local->hw, &sdata->u.mesh.work);
Johannes Berg472dbc42008-09-11 00:01:49 +0200690 rcu_read_unlock();
691}
692
Johannes Berg902acc72008-02-23 15:17:19 +0100693void ieee80211_mesh_init_sdata(struct ieee80211_sub_if_data *sdata)
694{
Johannes Berg472dbc42008-09-11 00:01:49 +0200695 struct ieee80211_if_mesh *ifmsh = &sdata->u.mesh;
Johannes Berg902acc72008-02-23 15:17:19 +0100696
Johannes Berg472dbc42008-09-11 00:01:49 +0200697 INIT_WORK(&ifmsh->work, ieee80211_mesh_work);
698 setup_timer(&ifmsh->housekeeping_timer,
699 ieee80211_mesh_housekeeping_timer,
700 (unsigned long) sdata);
701 skb_queue_head_init(&sdata->u.mesh.skb_queue);
702
703 ifmsh->mshcfg.dot11MeshRetryTimeout = MESH_RET_T;
704 ifmsh->mshcfg.dot11MeshConfirmTimeout = MESH_CONF_T;
705 ifmsh->mshcfg.dot11MeshHoldingTimeout = MESH_HOLD_T;
706 ifmsh->mshcfg.dot11MeshMaxRetries = MESH_MAX_RETR;
707 ifmsh->mshcfg.dot11MeshTTL = MESH_TTL;
708 ifmsh->mshcfg.auto_open_plinks = true;
709 ifmsh->mshcfg.dot11MeshMaxPeerLinks =
Johannes Berg902acc72008-02-23 15:17:19 +0100710 MESH_MAX_ESTAB_PLINKS;
Johannes Berg472dbc42008-09-11 00:01:49 +0200711 ifmsh->mshcfg.dot11MeshHWMPactivePathTimeout =
Johannes Berg902acc72008-02-23 15:17:19 +0100712 MESH_PATH_TIMEOUT;
Johannes Berg472dbc42008-09-11 00:01:49 +0200713 ifmsh->mshcfg.dot11MeshHWMPpreqMinInterval =
Johannes Berg902acc72008-02-23 15:17:19 +0100714 MESH_PREQ_MIN_INT;
Johannes Berg472dbc42008-09-11 00:01:49 +0200715 ifmsh->mshcfg.dot11MeshHWMPnetDiameterTraversalTime =
Johannes Berg902acc72008-02-23 15:17:19 +0100716 MESH_DIAM_TRAVERSAL_TIME;
Johannes Berg472dbc42008-09-11 00:01:49 +0200717 ifmsh->mshcfg.dot11MeshHWMPmaxPREQretries =
Johannes Berg902acc72008-02-23 15:17:19 +0100718 MESH_MAX_PREQ_RETRIES;
Johannes Berg472dbc42008-09-11 00:01:49 +0200719 ifmsh->mshcfg.path_refresh_time =
Johannes Berg902acc72008-02-23 15:17:19 +0100720 MESH_PATH_REFRESH_TIME;
Johannes Berg472dbc42008-09-11 00:01:49 +0200721 ifmsh->mshcfg.min_discovery_timeout =
Johannes Berg902acc72008-02-23 15:17:19 +0100722 MESH_MIN_DISCOVERY_TIMEOUT;
Johannes Berg472dbc42008-09-11 00:01:49 +0200723 ifmsh->accepting_plinks = true;
724 ifmsh->preq_id = 0;
Rui Paulod19b3bf2009-11-09 23:46:55 +0000725 ifmsh->sn = 0;
Johannes Berg472dbc42008-09-11 00:01:49 +0200726 atomic_set(&ifmsh->mpaths, 0);
Jasper Bryant-Greenef698d852008-08-03 12:04:37 +1200727 mesh_rmc_init(sdata);
Johannes Berg472dbc42008-09-11 00:01:49 +0200728 ifmsh->last_preq = jiffies;
Johannes Berg902acc72008-02-23 15:17:19 +0100729 /* Allocate all mesh structures when creating the first mesh interface. */
730 if (!mesh_allocated)
731 ieee80211s_init();
Johannes Berg472dbc42008-09-11 00:01:49 +0200732 mesh_ids_set_default(ifmsh);
733 setup_timer(&ifmsh->mesh_path_timer,
Johannes Berg902acc72008-02-23 15:17:19 +0100734 ieee80211_mesh_path_timer,
735 (unsigned long) sdata);
Rui Pauloe304bfd2009-11-09 23:46:56 +0000736 setup_timer(&ifmsh->mesh_path_root_timer,
737 ieee80211_mesh_path_root_timer,
738 (unsigned long) sdata);
Johannes Berg472dbc42008-09-11 00:01:49 +0200739 INIT_LIST_HEAD(&ifmsh->preq_queue.list);
740 spin_lock_init(&ifmsh->mesh_preq_queue_lock);
741}
742
743ieee80211_rx_result
Johannes Bergf1d58c22009-06-17 13:13:00 +0200744ieee80211_mesh_rx_mgmt(struct ieee80211_sub_if_data *sdata, struct sk_buff *skb)
Johannes Berg472dbc42008-09-11 00:01:49 +0200745{
746 struct ieee80211_local *local = sdata->local;
747 struct ieee80211_if_mesh *ifmsh = &sdata->u.mesh;
748 struct ieee80211_mgmt *mgmt;
749 u16 fc;
750
751 if (skb->len < 24)
752 return RX_DROP_MONITOR;
753
754 mgmt = (struct ieee80211_mgmt *) skb->data;
755 fc = le16_to_cpu(mgmt->frame_control);
756
757 switch (fc & IEEE80211_FCTL_STYPE) {
Johannes Berga43816d2009-07-10 11:39:26 +0200758 case IEEE80211_STYPE_ACTION:
759 if (skb->len < IEEE80211_MIN_ACTION_SIZE)
760 return RX_DROP_MONITOR;
761 /* fall through */
Johannes Berg472dbc42008-09-11 00:01:49 +0200762 case IEEE80211_STYPE_PROBE_RESP:
763 case IEEE80211_STYPE_BEACON:
Johannes Berg472dbc42008-09-11 00:01:49 +0200764 skb_queue_tail(&ifmsh->skb_queue, skb);
Luis R. Rodriguezc03e20f2009-08-04 15:06:26 -0700765 ieee80211_queue_work(&local->hw, &ifmsh->work);
Johannes Berg472dbc42008-09-11 00:01:49 +0200766 return RX_QUEUED;
767 }
768
769 return RX_CONTINUE;
Johannes Berg902acc72008-02-23 15:17:19 +0100770}