blob: c326e009389d918be75d3ed0cb4c1552c2a8b82b [file] [log] [blame]
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
Tejun Heo5a0e3ad2010-03-24 17:04:11 +090011#include <linux/slab.h>
Luis Carlos Cobo51cedda2008-04-23 12:15:29 -070012#include <asm/unaligned.h>
Luis Carlos Cobo2e3c8732008-02-23 15:17:09 +010013#include "ieee80211_i.h"
14#include "mesh.h"
15
Johannes Berg472dbc42008-09-11 00:01:49 +020016#define IEEE80211_MESH_PEER_INACTIVITY_LIMIT (1800 * HZ)
17#define IEEE80211_MESH_HOUSEKEEPING_INTERVAL (60 * HZ)
Rui Pauloe304bfd2009-11-09 23:46:56 +000018#define IEEE80211_MESH_RANN_INTERVAL (1 * HZ)
Johannes Berg472dbc42008-09-11 00:01:49 +020019
Rui Paulo34917072009-11-09 23:46:39 +000020#define MESHCONF_CAPAB_ACCEPT_PLINKS 0x01
21#define MESHCONF_CAPAB_FORWARDING 0x08
Luis Carlos Cobo2e3c8732008-02-23 15:17:09 +010022
Johannes Berg5bb644a2009-05-17 11:40:42 +020023#define TMR_RUNNING_HK 0
24#define TMR_RUNNING_MP 1
Rui Pauloe304bfd2009-11-09 23:46:56 +000025#define TMR_RUNNING_MPR 2
Johannes Berg5bb644a2009-05-17 11:40:42 +020026
Luis Carlos Cobo2e3c8732008-02-23 15:17:09 +010027int mesh_allocated;
28static struct kmem_cache *rm_cache;
29
30void 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
38void ieee80211s_stop(void)
39{
40 mesh_pathtbl_unregister();
41 kmem_cache_destroy(rm_cache);
42}
43
Johannes Berg472dbc42008-09-11 00:01:49 +020044static 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
Rui Paulo6b9ac442009-10-20 21:21:48 +010050 set_bit(MESH_WORK_HOUSEKEEPING, &ifmsh->wrkq_flags);
Johannes Berg5bb644a2009-05-17 11:40:42 +020051
52 if (local->quiescing) {
53 set_bit(TMR_RUNNING_HK, &ifmsh->timers_running);
54 return;
55 }
56
Johannes Berg64592c82010-06-10 10:21:31 +020057 ieee80211_queue_work(&local->hw, &sdata->work);
Johannes Berg472dbc42008-09-11 00:01:49 +020058}
59
Luis Carlos Cobo2e3c8732008-02-23 15:17:09 +010060/**
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
Jasper Bryant-Greenef698d852008-08-03 12:04:37 +120064 * @sdata: local mesh subif
Luis Carlos Cobo2e3c8732008-02-23 15:17:09 +010065 *
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 */
Jasper Bryant-Greenef698d852008-08-03 12:04:37 +120069bool mesh_matches_local(struct ieee802_11_elems *ie, struct ieee80211_sub_if_data *sdata)
Luis Carlos Cobo2e3c8732008-02-23 15:17:09 +010070{
Johannes Berg472dbc42008-09-11 00:01:49 +020071 struct ieee80211_if_mesh *ifmsh = &sdata->u.mesh;
Luis Carlos Cobo2e3c8732008-02-23 15:17:09 +010072
Luis Carlos Cobo2e3c8732008-02-23 15:17:09 +010073 /*
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 */
Johannes Berg472dbc42008-09-11 00:01:49 +020083 if (ifmsh->mesh_id_len == ie->mesh_id_len &&
84 memcmp(ifmsh->mesh_id, ie->mesh_id, ie->mesh_id_len) == 0 &&
Rui Paulo136cfa22009-11-18 18:40:00 +000085 (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))
Luis Carlos Cobo2e3c8732008-02-23 15:17:09 +010090 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
Luis Carlos Cobo2e3c8732008-02-23 15:17:09 +010099 */
Jasper Bryant-Greenef698d852008-08-03 12:04:37 +1200100bool mesh_peer_accepts_plinks(struct ieee802_11_elems *ie)
Luis Carlos Cobo2e3c8732008-02-23 15:17:09 +0100101{
Rui Paulo136cfa22009-11-18 18:40:00 +0000102 return (ie->mesh_config->meshconf_cap &
Rui Paulo34917072009-11-09 23:46:39 +0000103 MESHCONF_CAPAB_ACCEPT_PLINKS) != 0;
Luis Carlos Cobo2e3c8732008-02-23 15:17:09 +0100104}
105
106/**
107 * mesh_accept_plinks_update: update accepting_plink in local mesh beacons
108 *
Johannes Bergd0709a62008-02-25 16:27:46 +0100109 * @sdata: mesh interface in which mesh beacons are going to be updated
Luis Carlos Cobo2e3c8732008-02-23 15:17:09 +0100110 */
Johannes Bergd0709a62008-02-25 16:27:46 +0100111void mesh_accept_plinks_update(struct ieee80211_sub_if_data *sdata)
Luis Carlos Cobo2e3c8732008-02-23 15:17:09 +0100112{
Luis Carlos Cobo2e3c8732008-02-23 15:17:09 +0100113 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
Luis Carlos Cobob4e08ea2008-02-29 15:46:08 -0800117 * 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
Luis Carlos Cobo2e3c8732008-02-23 15:17:09 +0100120 */
121 free_plinks = mesh_plink_availables(sdata);
122
Johannes Berg472dbc42008-09-11 00:01:49 +0200123 if (free_plinks != sdata->u.mesh.accepting_plinks)
124 ieee80211_mesh_housekeeping_timer((unsigned long) sdata);
Luis Carlos Cobo2e3c8732008-02-23 15:17:09 +0100125}
126
Johannes Berg472dbc42008-09-11 00:01:49 +0200127void mesh_ids_set_default(struct ieee80211_if_mesh *sta)
Luis Carlos Cobo2e3c8732008-02-23 15:17:09 +0100128{
Rui Paulo34917072009-11-09 23:46:39 +0000129 sta->mesh_pp_id = 0; /* HWMP */
130 sta->mesh_pm_id = 0; /* Airtime */
131 sta->mesh_cc_id = 0; /* Disabled */
132 sta->mesh_sp_id = 0; /* Neighbor Offset */
133 sta->mesh_auth_id = 0; /* Disabled */
Luis Carlos Cobo2e3c8732008-02-23 15:17:09 +0100134}
135
Jasper Bryant-Greenef698d852008-08-03 12:04:37 +1200136int mesh_rmc_init(struct ieee80211_sub_if_data *sdata)
Luis Carlos Cobo2e3c8732008-02-23 15:17:09 +0100137{
Luis Carlos Cobo2e3c8732008-02-23 15:17:09 +0100138 int i;
139
Johannes Berg472dbc42008-09-11 00:01:49 +0200140 sdata->u.mesh.rmc = kmalloc(sizeof(struct mesh_rmc), GFP_KERNEL);
141 if (!sdata->u.mesh.rmc)
Luis Carlos Cobo2e3c8732008-02-23 15:17:09 +0100142 return -ENOMEM;
Johannes Berg472dbc42008-09-11 00:01:49 +0200143 sdata->u.mesh.rmc->idx_mask = RMC_BUCKETS - 1;
Luis Carlos Cobo2e3c8732008-02-23 15:17:09 +0100144 for (i = 0; i < RMC_BUCKETS; i++)
Johannes Berg472dbc42008-09-11 00:01:49 +0200145 INIT_LIST_HEAD(&sdata->u.mesh.rmc->bucket[i].list);
Luis Carlos Cobo2e3c8732008-02-23 15:17:09 +0100146 return 0;
147}
148
Jasper Bryant-Greenef698d852008-08-03 12:04:37 +1200149void mesh_rmc_free(struct ieee80211_sub_if_data *sdata)
Luis Carlos Cobo2e3c8732008-02-23 15:17:09 +0100150{
Johannes Berg472dbc42008-09-11 00:01:49 +0200151 struct mesh_rmc *rmc = sdata->u.mesh.rmc;
Luis Carlos Cobo2e3c8732008-02-23 15:17:09 +0100152 struct rmc_entry *p, *n;
153 int i;
154
Johannes Berg472dbc42008-09-11 00:01:49 +0200155 if (!sdata->u.mesh.rmc)
Luis Carlos Cobo2e3c8732008-02-23 15:17:09 +0100156 return;
157
158 for (i = 0; i < RMC_BUCKETS; i++)
159 list_for_each_entry_safe(p, n, &rmc->bucket[i].list, list) {
160 list_del(&p->list);
161 kmem_cache_free(rm_cache, p);
162 }
163
164 kfree(rmc);
Johannes Berg472dbc42008-09-11 00:01:49 +0200165 sdata->u.mesh.rmc = NULL;
Luis Carlos Cobo2e3c8732008-02-23 15:17:09 +0100166}
167
168/**
169 * mesh_rmc_check - Check frame in recent multicast cache and add if absent.
170 *
171 * @sa: source address
172 * @mesh_hdr: mesh_header
173 *
174 * Returns: 0 if the frame is not in the cache, nonzero otherwise.
175 *
176 * Checks using the source address and the mesh sequence number if we have
177 * received this frame lately. If the frame is not in the cache, it is added to
178 * it.
179 */
180int mesh_rmc_check(u8 *sa, struct ieee80211s_hdr *mesh_hdr,
Jasper Bryant-Greenef698d852008-08-03 12:04:37 +1200181 struct ieee80211_sub_if_data *sdata)
Luis Carlos Cobo2e3c8732008-02-23 15:17:09 +0100182{
Johannes Berg472dbc42008-09-11 00:01:49 +0200183 struct mesh_rmc *rmc = sdata->u.mesh.rmc;
Luis Carlos Cobo2e3c8732008-02-23 15:17:09 +0100184 u32 seqnum = 0;
185 int entries = 0;
186 u8 idx;
187 struct rmc_entry *p, *n;
188
189 /* Don't care about endianness since only match matters */
Luis Carlos Cobo51cedda2008-04-23 12:15:29 -0700190 memcpy(&seqnum, &mesh_hdr->seqnum, sizeof(mesh_hdr->seqnum));
191 idx = le32_to_cpu(mesh_hdr->seqnum) & rmc->idx_mask;
Luis Carlos Cobo2e3c8732008-02-23 15:17:09 +0100192 list_for_each_entry_safe(p, n, &rmc->bucket[idx].list, list) {
193 ++entries;
194 if (time_after(jiffies, p->exp_time) ||
195 (entries == RMC_QUEUE_MAX_LEN)) {
196 list_del(&p->list);
197 kmem_cache_free(rm_cache, p);
198 --entries;
Joe Perchesf64f9e72009-11-29 16:55:45 -0800199 } else if ((seqnum == p->seqnum) &&
200 (memcmp(sa, p->sa, ETH_ALEN) == 0))
Luis Carlos Cobo2e3c8732008-02-23 15:17:09 +0100201 return -1;
202 }
203
204 p = kmem_cache_alloc(rm_cache, GFP_ATOMIC);
205 if (!p) {
206 printk(KERN_DEBUG "o11s: could not allocate RMC entry\n");
207 return 0;
208 }
209 p->seqnum = seqnum;
210 p->exp_time = jiffies + RMC_TIMEOUT;
211 memcpy(p->sa, sa, ETH_ALEN);
212 list_add(&p->list, &rmc->bucket[idx].list);
213 return 0;
214}
215
Jasper Bryant-Greenef698d852008-08-03 12:04:37 +1200216void mesh_mgmt_ies_add(struct sk_buff *skb, struct ieee80211_sub_if_data *sdata)
Luis Carlos Cobo2e3c8732008-02-23 15:17:09 +0100217{
Jasper Bryant-Greenef698d852008-08-03 12:04:37 +1200218 struct ieee80211_local *local = sdata->local;
Luis Carlos Cobo2e3c8732008-02-23 15:17:09 +0100219 struct ieee80211_supported_band *sband;
220 u8 *pos;
221 int len, i, rate;
Rui Paulo8f2fda92009-11-09 23:46:41 +0000222 u8 neighbors;
Luis Carlos Cobo2e3c8732008-02-23 15:17:09 +0100223
224 sband = local->hw.wiphy->bands[local->hw.conf.channel->band];
225 len = sband->n_bitrates;
226 if (len > 8)
227 len = 8;
228 pos = skb_put(skb, len + 2);
229 *pos++ = WLAN_EID_SUPP_RATES;
230 *pos++ = len;
231 for (i = 0; i < len; i++) {
232 rate = sband->bitrates[i].bitrate;
233 *pos++ = (u8) (rate / 5);
234 }
235
236 if (sband->n_bitrates > len) {
237 pos = skb_put(skb, sband->n_bitrates - len + 2);
238 *pos++ = WLAN_EID_EXT_SUPP_RATES;
239 *pos++ = sband->n_bitrates - len;
240 for (i = len; i < sband->n_bitrates; i++) {
241 rate = sband->bitrates[i].bitrate;
242 *pos++ = (u8) (rate / 5);
243 }
244 }
245
Rui Paulobe125c62009-11-09 23:46:54 +0000246 if (sband->band == IEEE80211_BAND_2GHZ) {
247 pos = skb_put(skb, 2 + 1);
248 *pos++ = WLAN_EID_DS_PARAMS;
249 *pos++ = 1;
250 *pos++ = ieee80211_frequency_to_channel(local->hw.conf.channel->center_freq);
251 }
252
Johannes Berg472dbc42008-09-11 00:01:49 +0200253 pos = skb_put(skb, 2 + sdata->u.mesh.mesh_id_len);
Luis Carlos Cobo2e3c8732008-02-23 15:17:09 +0100254 *pos++ = WLAN_EID_MESH_ID;
Johannes Berg472dbc42008-09-11 00:01:49 +0200255 *pos++ = sdata->u.mesh.mesh_id_len;
256 if (sdata->u.mesh.mesh_id_len)
257 memcpy(pos, sdata->u.mesh.mesh_id, sdata->u.mesh.mesh_id_len);
Luis Carlos Cobo2e3c8732008-02-23 15:17:09 +0100258
Rui Paulo136cfa22009-11-18 18:40:00 +0000259 pos = skb_put(skb, 2 + sizeof(struct ieee80211_meshconf_ie));
Luis Carlos Cobo2e3c8732008-02-23 15:17:09 +0100260 *pos++ = WLAN_EID_MESH_CONFIG;
Rui Paulo136cfa22009-11-18 18:40:00 +0000261 *pos++ = sizeof(struct ieee80211_meshconf_ie);
Luis Carlos Cobo2e3c8732008-02-23 15:17:09 +0100262
263 /* Active path selection protocol ID */
Rui Paulo34917072009-11-09 23:46:39 +0000264 *pos++ = sdata->u.mesh.mesh_pp_id;
Luis Carlos Cobo2e3c8732008-02-23 15:17:09 +0100265
266 /* Active path selection metric ID */
Rui Paulo34917072009-11-09 23:46:39 +0000267 *pos++ = sdata->u.mesh.mesh_pm_id;
Luis Carlos Cobo2e3c8732008-02-23 15:17:09 +0100268
269 /* Congestion control mode identifier */
Rui Paulo34917072009-11-09 23:46:39 +0000270 *pos++ = sdata->u.mesh.mesh_cc_id;
Luis Carlos Cobo2e3c8732008-02-23 15:17:09 +0100271
Javier Cardona9e03fdf2009-08-20 09:21:45 -0700272 /* Synchronization protocol identifier */
Rui Paulo34917072009-11-09 23:46:39 +0000273 *pos++ = sdata->u.mesh.mesh_sp_id;
Luis Carlos Cobo2e3c8732008-02-23 15:17:09 +0100274
Javier Cardona9e03fdf2009-08-20 09:21:45 -0700275 /* Authentication Protocol identifier */
Rui Paulo34917072009-11-09 23:46:39 +0000276 *pos++ = sdata->u.mesh.mesh_auth_id;
Javier Cardona9e03fdf2009-08-20 09:21:45 -0700277
Rui Paulo8f2fda92009-11-09 23:46:41 +0000278 /* Mesh Formation Info - number of neighbors */
279 neighbors = atomic_read(&sdata->u.mesh.mshstats.estab_plinks);
280 /* Number of neighbor mesh STAs or 15 whichever is smaller */
281 neighbors = (neighbors > 15) ? 15 : neighbors;
282 *pos++ = neighbors << 1;
Javier Cardona9e03fdf2009-08-20 09:21:45 -0700283
Luis Carlos Cobo2e3c8732008-02-23 15:17:09 +0100284 /* Mesh capability */
Johannes Berg472dbc42008-09-11 00:01:49 +0200285 sdata->u.mesh.accepting_plinks = mesh_plink_availables(sdata);
Rui Paulo34917072009-11-09 23:46:39 +0000286 *pos = MESHCONF_CAPAB_FORWARDING;
287 *pos++ |= sdata->u.mesh.accepting_plinks ?
288 MESHCONF_CAPAB_ACCEPT_PLINKS : 0x00;
Luis Carlos Cobo2e3c8732008-02-23 15:17:09 +0100289 *pos++ = 0x00;
Javier Cardonac80d5452010-12-16 17:37:49 -0800290
291 if (sdata->u.mesh.vendor_ie) {
292 int len = sdata->u.mesh.vendor_ie_len;
293 const u8 *data = sdata->u.mesh.vendor_ie;
294 if (skb_tailroom(skb) > len)
295 memcpy(skb_put(skb, len), data, len);
296 }
Luis Carlos Cobo2e3c8732008-02-23 15:17:09 +0100297}
298
Jasper Bryant-Greenef698d852008-08-03 12:04:37 +1200299u32 mesh_table_hash(u8 *addr, struct ieee80211_sub_if_data *sdata, struct mesh_table *tbl)
Luis Carlos Cobo2e3c8732008-02-23 15:17:09 +0100300{
301 /* Use last four bytes of hw addr and interface index as hash index */
Jasper Bryant-Greenef698d852008-08-03 12:04:37 +1200302 return jhash_2words(*(u32 *)(addr+2), sdata->dev->ifindex, tbl->hash_rnd)
Luis Carlos Cobo2e3c8732008-02-23 15:17:09 +0100303 & tbl->hash_mask;
304}
305
Luis Carlos Cobo2e3c8732008-02-23 15:17:09 +0100306struct 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
Luis Carlos Cobo2e3c8732008-02-23 15:17:09 +0100342
343static void ieee80211_mesh_path_timer(unsigned long data)
344{
345 struct ieee80211_sub_if_data *sdata =
346 (struct ieee80211_sub_if_data *) data;
Johannes Berg472dbc42008-09-11 00:01:49 +0200347 struct ieee80211_if_mesh *ifmsh = &sdata->u.mesh;
Johannes Berg133b8222008-09-16 14:18:59 +0200348 struct ieee80211_local *local = sdata->local;
Luis Carlos Cobo2e3c8732008-02-23 15:17:09 +0100349
Johannes Berg5bb644a2009-05-17 11:40:42 +0200350 if (local->quiescing) {
351 set_bit(TMR_RUNNING_MP, &ifmsh->timers_running);
352 return;
353 }
354
Johannes Berg64592c82010-06-10 10:21:31 +0200355 ieee80211_queue_work(&local->hw, &sdata->work);
Luis Carlos Cobo2e3c8732008-02-23 15:17:09 +0100356}
357
Rui Pauloe304bfd2009-11-09 23:46:56 +0000358static void ieee80211_mesh_path_root_timer(unsigned long data)
359{
360 struct ieee80211_sub_if_data *sdata =
361 (struct ieee80211_sub_if_data *) data;
362 struct ieee80211_if_mesh *ifmsh = &sdata->u.mesh;
363 struct ieee80211_local *local = sdata->local;
364
365 set_bit(MESH_WORK_ROOT, &ifmsh->wrkq_flags);
366
367 if (local->quiescing) {
368 set_bit(TMR_RUNNING_MPR, &ifmsh->timers_running);
369 return;
370 }
371
Johannes Berg64592c82010-06-10 10:21:31 +0200372 ieee80211_queue_work(&local->hw, &sdata->work);
Rui Pauloe304bfd2009-11-09 23:46:56 +0000373}
374
Rui Paulo63c57232009-11-09 23:46:57 +0000375void ieee80211_mesh_root_setup(struct ieee80211_if_mesh *ifmsh)
376{
377 if (ifmsh->mshcfg.dot11MeshHWMPRootMode)
378 set_bit(MESH_WORK_ROOT, &ifmsh->wrkq_flags);
379 else {
380 clear_bit(MESH_WORK_ROOT, &ifmsh->wrkq_flags);
381 /* stop running timer */
382 del_timer_sync(&ifmsh->mesh_path_root_timer);
383 }
384}
385
Johannes Berg902acc72008-02-23 15:17:19 +0100386/**
Javier Cardona3c5772a2009-08-10 12:15:48 -0700387 * ieee80211_fill_mesh_addresses - fill addresses of a locally originated mesh frame
388 * @hdr: 802.11 frame header
389 * @fc: frame control field
390 * @meshda: destination address in the mesh
391 * @meshsa: source address address in the mesh. Same as TA, as frame is
392 * locally originated.
393 *
394 * Return the length of the 802.11 (does not include a mesh control header)
395 */
Johannes Berg15ff6362009-11-17 13:34:04 +0100396int ieee80211_fill_mesh_addresses(struct ieee80211_hdr *hdr, __le16 *fc,
397 const u8 *meshda, const u8 *meshsa)
398{
Javier Cardona3c5772a2009-08-10 12:15:48 -0700399 if (is_multicast_ether_addr(meshda)) {
400 *fc |= cpu_to_le16(IEEE80211_FCTL_FROMDS);
401 /* DA TA SA */
402 memcpy(hdr->addr1, meshda, ETH_ALEN);
403 memcpy(hdr->addr2, meshsa, ETH_ALEN);
404 memcpy(hdr->addr3, meshsa, ETH_ALEN);
405 return 24;
406 } else {
407 *fc |= cpu_to_le16(IEEE80211_FCTL_FROMDS |
408 IEEE80211_FCTL_TODS);
409 /* RA TA DA SA */
410 memset(hdr->addr1, 0, ETH_ALEN); /* RA is resolved later */
411 memcpy(hdr->addr2, meshsa, ETH_ALEN);
412 memcpy(hdr->addr3, meshda, ETH_ALEN);
413 memcpy(hdr->addr4, meshsa, ETH_ALEN);
414 return 30;
415 }
416}
417
418/**
Johannes Berg902acc72008-02-23 15:17:19 +0100419 * ieee80211_new_mesh_header - create a new mesh header
420 * @meshhdr: uninitialized mesh header
421 * @sdata: mesh interface to be used
Javier Cardona3c5772a2009-08-10 12:15:48 -0700422 * @addr4: addr4 of the mesh frame (1st in ae header)
423 * may be NULL
424 * @addr5: addr5 of the mesh frame (1st or 2nd in ae header)
425 * may be NULL unless addr6 is present
426 * @addr6: addr6 of the mesh frame (2nd or 3rd in ae header)
427 * may be NULL unless addr5 is present
Johannes Berg902acc72008-02-23 15:17:19 +0100428 *
429 * Return the header length.
430 */
431int ieee80211_new_mesh_header(struct ieee80211s_hdr *meshhdr,
Javier Cardona3c5772a2009-08-10 12:15:48 -0700432 struct ieee80211_sub_if_data *sdata, char *addr4,
433 char *addr5, char *addr6)
Johannes Berg902acc72008-02-23 15:17:19 +0100434{
Javier Cardona3c5772a2009-08-10 12:15:48 -0700435 int aelen = 0;
Julia Lawall0c3cee72009-12-09 20:25:59 +0100436 memset(meshhdr, 0, sizeof(*meshhdr));
Johannes Berg472dbc42008-09-11 00:01:49 +0200437 meshhdr->ttl = sdata->u.mesh.mshcfg.dot11MeshTTL;
438 put_unaligned(cpu_to_le32(sdata->u.mesh.mesh_seqnum), &meshhdr->seqnum);
439 sdata->u.mesh.mesh_seqnum++;
Javier Cardona3c5772a2009-08-10 12:15:48 -0700440 if (addr4) {
441 meshhdr->flags |= MESH_FLAGS_AE_A4;
442 aelen += ETH_ALEN;
443 memcpy(meshhdr->eaddr1, addr4, ETH_ALEN);
444 }
445 if (addr5 && addr6) {
446 meshhdr->flags |= MESH_FLAGS_AE_A5_A6;
447 aelen += 2 * ETH_ALEN;
448 if (!addr4) {
449 memcpy(meshhdr->eaddr1, addr5, ETH_ALEN);
450 memcpy(meshhdr->eaddr2, addr6, ETH_ALEN);
451 } else {
452 memcpy(meshhdr->eaddr2, addr5, ETH_ALEN);
453 memcpy(meshhdr->eaddr3, addr6, ETH_ALEN);
454 }
455 }
456 return 6 + aelen;
Johannes Berg902acc72008-02-23 15:17:19 +0100457}
458
Johannes Berg472dbc42008-09-11 00:01:49 +0200459static void ieee80211_mesh_housekeeping(struct ieee80211_sub_if_data *sdata,
460 struct ieee80211_if_mesh *ifmsh)
461{
462 bool free_plinks;
463
464#ifdef CONFIG_MAC80211_VERBOSE_DEBUG
465 printk(KERN_DEBUG "%s: running mesh housekeeping\n",
Johannes Berg47846c92009-11-25 17:46:19 +0100466 sdata->name);
Johannes Berg472dbc42008-09-11 00:01:49 +0200467#endif
468
469 ieee80211_sta_expire(sdata, IEEE80211_MESH_PEER_INACTIVITY_LIMIT);
470 mesh_path_expire(sdata);
471
472 free_plinks = mesh_plink_availables(sdata);
473 if (free_plinks != sdata->u.mesh.accepting_plinks)
Johannes Berg2d0ddec2009-04-23 16:13:26 +0200474 ieee80211_bss_info_change_notify(sdata, BSS_CHANGED_BEACON);
Johannes Berg472dbc42008-09-11 00:01:49 +0200475
Johannes Berg472dbc42008-09-11 00:01:49 +0200476 mod_timer(&ifmsh->housekeeping_timer,
477 round_jiffies(jiffies + IEEE80211_MESH_HOUSEKEEPING_INTERVAL));
478}
479
Rui Pauloe304bfd2009-11-09 23:46:56 +0000480static void ieee80211_mesh_rootpath(struct ieee80211_sub_if_data *sdata)
481{
482 struct ieee80211_if_mesh *ifmsh = &sdata->u.mesh;
483
484 mesh_path_tx_root_frame(sdata);
485 mod_timer(&ifmsh->mesh_path_root_timer,
486 round_jiffies(jiffies + IEEE80211_MESH_RANN_INTERVAL));
487}
488
Johannes Berg5bb644a2009-05-17 11:40:42 +0200489#ifdef CONFIG_PM
490void ieee80211_mesh_quiesce(struct ieee80211_sub_if_data *sdata)
491{
492 struct ieee80211_if_mesh *ifmsh = &sdata->u.mesh;
493
Johannes Berg5bb644a2009-05-17 11:40:42 +0200494 /* use atomic bitops in case both timers fire at the same time */
495
496 if (del_timer_sync(&ifmsh->housekeeping_timer))
497 set_bit(TMR_RUNNING_HK, &ifmsh->timers_running);
498 if (del_timer_sync(&ifmsh->mesh_path_timer))
499 set_bit(TMR_RUNNING_MP, &ifmsh->timers_running);
Rui Pauloe304bfd2009-11-09 23:46:56 +0000500 if (del_timer_sync(&ifmsh->mesh_path_root_timer))
501 set_bit(TMR_RUNNING_MPR, &ifmsh->timers_running);
Johannes Berg5bb644a2009-05-17 11:40:42 +0200502}
503
504void ieee80211_mesh_restart(struct ieee80211_sub_if_data *sdata)
505{
506 struct ieee80211_if_mesh *ifmsh = &sdata->u.mesh;
507
508 if (test_and_clear_bit(TMR_RUNNING_HK, &ifmsh->timers_running))
509 add_timer(&ifmsh->housekeeping_timer);
510 if (test_and_clear_bit(TMR_RUNNING_MP, &ifmsh->timers_running))
511 add_timer(&ifmsh->mesh_path_timer);
Rui Pauloe304bfd2009-11-09 23:46:56 +0000512 if (test_and_clear_bit(TMR_RUNNING_MPR, &ifmsh->timers_running))
513 add_timer(&ifmsh->mesh_path_root_timer);
Rui Paulo63c57232009-11-09 23:46:57 +0000514 ieee80211_mesh_root_setup(ifmsh);
Johannes Berg5bb644a2009-05-17 11:40:42 +0200515}
516#endif
Johannes Berg472dbc42008-09-11 00:01:49 +0200517
518void ieee80211_start_mesh(struct ieee80211_sub_if_data *sdata)
519{
520 struct ieee80211_if_mesh *ifmsh = &sdata->u.mesh;
521 struct ieee80211_local *local = sdata->local;
522
Johannes Berg09b17472010-12-03 09:20:41 +0100523 local->fif_other_bss++;
524 /* mesh ifaces must set allmulti to forward mcast traffic */
525 atomic_inc(&local->iff_allmultis);
526 ieee80211_configure_filter(local);
527
Rui Paulo6b9ac442009-10-20 21:21:48 +0100528 set_bit(MESH_WORK_HOUSEKEEPING, &ifmsh->wrkq_flags);
Rui Paulo63c57232009-11-09 23:46:57 +0000529 ieee80211_mesh_root_setup(ifmsh);
Johannes Berg64592c82010-06-10 10:21:31 +0200530 ieee80211_queue_work(&local->hw, &sdata->work);
Javier Cardona5b365832009-08-10 12:15:51 -0700531 sdata->vif.bss_conf.beacon_int = MESH_DEFAULT_BEACON_INTERVAL;
Johannes Berg2d0ddec2009-04-23 16:13:26 +0200532 ieee80211_bss_info_change_notify(sdata, BSS_CHANGED_BEACON |
Javier Cardona5b365832009-08-10 12:15:51 -0700533 BSS_CHANGED_BEACON_ENABLED |
534 BSS_CHANGED_BEACON_INT);
Johannes Berg472dbc42008-09-11 00:01:49 +0200535}
536
537void ieee80211_stop_mesh(struct ieee80211_sub_if_data *sdata)
538{
Johannes Berg09b17472010-12-03 09:20:41 +0100539 struct ieee80211_local *local = sdata->local;
Johannes Berg29cbe682010-12-03 09:20:44 +0100540 struct ieee80211_if_mesh *ifmsh = &sdata->u.mesh;
541
542 ifmsh->mesh_id_len = 0;
543 ieee80211_bss_info_change_notify(sdata, BSS_CHANGED_BEACON_ENABLED);
544 sta_info_flush(local, NULL);
Johannes Berg09b17472010-12-03 09:20:41 +0100545
Johannes Berg472dbc42008-09-11 00:01:49 +0200546 del_timer_sync(&sdata->u.mesh.housekeeping_timer);
Rui Pauloe304bfd2009-11-09 23:46:56 +0000547 del_timer_sync(&sdata->u.mesh.mesh_path_root_timer);
Johannes Berg472dbc42008-09-11 00:01:49 +0200548 /*
Johannes Bergb7413432008-09-11 00:01:50 +0200549 * If the timer fired while we waited for it, it will have
550 * requeued the work. Now the work will be running again
551 * but will not rearm the timer again because it checks
552 * whether the interface is running, which, at this point,
553 * it no longer is.
554 */
Johannes Berg64592c82010-06-10 10:21:31 +0200555 cancel_work_sync(&sdata->work);
Johannes Berg09b17472010-12-03 09:20:41 +0100556
557 local->fif_other_bss--;
558 atomic_dec(&local->iff_allmultis);
559 ieee80211_configure_filter(local);
Johannes Berg472dbc42008-09-11 00:01:49 +0200560}
561
562static void ieee80211_mesh_rx_bcn_presp(struct ieee80211_sub_if_data *sdata,
563 u16 stype,
564 struct ieee80211_mgmt *mgmt,
565 size_t len,
566 struct ieee80211_rx_status *rx_status)
567{
Johannes Bergc6a1fa12008-10-07 12:04:32 +0200568 struct ieee80211_local *local = sdata->local;
Johannes Berg472dbc42008-09-11 00:01:49 +0200569 struct ieee802_11_elems elems;
570 struct ieee80211_channel *channel;
Johannes Berg881d9482009-01-21 15:13:48 +0100571 u32 supp_rates = 0;
Johannes Berg472dbc42008-09-11 00:01:49 +0200572 size_t baselen;
573 int freq;
574 enum ieee80211_band band = rx_status->band;
575
576 /* ignore ProbeResp to foreign address */
577 if (stype == IEEE80211_STYPE_PROBE_RESP &&
Johannes Berg47846c92009-11-25 17:46:19 +0100578 compare_ether_addr(mgmt->da, sdata->vif.addr))
Johannes Berg472dbc42008-09-11 00:01:49 +0200579 return;
580
581 baselen = (u8 *) mgmt->u.probe_resp.variable - (u8 *) mgmt;
582 if (baselen > len)
583 return;
584
585 ieee802_11_parse_elems(mgmt->u.probe_resp.variable, len - baselen,
586 &elems);
587
588 if (elems.ds_params && elems.ds_params_len == 1)
589 freq = ieee80211_channel_to_frequency(elems.ds_params[0]);
590 else
591 freq = rx_status->freq;
592
593 channel = ieee80211_get_channel(local->hw.wiphy, freq);
594
595 if (!channel || channel->flags & IEEE80211_CHAN_DISABLED)
596 return;
597
598 if (elems.mesh_id && elems.mesh_config &&
599 mesh_matches_local(&elems, sdata)) {
600 supp_rates = ieee80211_sta_get_rates(local, &elems, band);
601
602 mesh_neighbour_update(mgmt->sa, supp_rates, sdata,
603 mesh_peer_accepts_plinks(&elems));
604 }
605}
606
607static void ieee80211_mesh_rx_mgmt_action(struct ieee80211_sub_if_data *sdata,
608 struct ieee80211_mgmt *mgmt,
609 size_t len,
610 struct ieee80211_rx_status *rx_status)
611{
612 switch (mgmt->u.action.category) {
Javier Cardona97ad9132010-03-29 11:00:21 -0700613 case WLAN_CATEGORY_MESH_PLINK:
Johannes Berg472dbc42008-09-11 00:01:49 +0200614 mesh_rx_plink_frame(sdata, mgmt, len, rx_status);
615 break;
Javier Cardona97ad9132010-03-29 11:00:21 -0700616 case WLAN_CATEGORY_MESH_PATH_SEL:
Johannes Berg472dbc42008-09-11 00:01:49 +0200617 mesh_rx_path_sel_frame(sdata, mgmt, len);
618 break;
619 }
620}
621
Johannes Berg1fa57d02010-06-10 10:21:32 +0200622void ieee80211_mesh_rx_queued_mgmt(struct ieee80211_sub_if_data *sdata,
623 struct sk_buff *skb)
Johannes Berg472dbc42008-09-11 00:01:49 +0200624{
625 struct ieee80211_rx_status *rx_status;
626 struct ieee80211_if_mesh *ifmsh;
627 struct ieee80211_mgmt *mgmt;
628 u16 stype;
629
630 ifmsh = &sdata->u.mesh;
631
Johannes Bergf1d58c22009-06-17 13:13:00 +0200632 rx_status = IEEE80211_SKB_RXCB(skb);
Johannes Berg472dbc42008-09-11 00:01:49 +0200633 mgmt = (struct ieee80211_mgmt *) skb->data;
634 stype = le16_to_cpu(mgmt->frame_control) & IEEE80211_FCTL_STYPE;
635
636 switch (stype) {
637 case IEEE80211_STYPE_PROBE_RESP:
638 case IEEE80211_STYPE_BEACON:
639 ieee80211_mesh_rx_bcn_presp(sdata, stype, mgmt, skb->len,
640 rx_status);
641 break;
642 case IEEE80211_STYPE_ACTION:
643 ieee80211_mesh_rx_mgmt_action(sdata, mgmt, skb->len, rx_status);
644 break;
645 }
Johannes Berg472dbc42008-09-11 00:01:49 +0200646}
647
Johannes Berg1fa57d02010-06-10 10:21:32 +0200648void ieee80211_mesh_work(struct ieee80211_sub_if_data *sdata)
Johannes Berg472dbc42008-09-11 00:01:49 +0200649{
Johannes Berg472dbc42008-09-11 00:01:49 +0200650 struct ieee80211_if_mesh *ifmsh = &sdata->u.mesh;
Johannes Berg472dbc42008-09-11 00:01:49 +0200651
652 if (ifmsh->preq_queue_len &&
653 time_after(jiffies,
654 ifmsh->last_preq + msecs_to_jiffies(ifmsh->mshcfg.dot11MeshHWMPpreqMinInterval)))
655 mesh_path_start_discovery(sdata);
656
Javier Cardona18889232009-08-10 12:15:52 -0700657 if (test_and_clear_bit(MESH_WORK_GROW_MPATH_TABLE, &ifmsh->wrkq_flags))
658 mesh_mpath_table_grow();
659
660 if (test_and_clear_bit(MESH_WORK_GROW_MPATH_TABLE, &ifmsh->wrkq_flags))
661 mesh_mpp_table_grow();
662
663 if (test_and_clear_bit(MESH_WORK_HOUSEKEEPING, &ifmsh->wrkq_flags))
Johannes Berg472dbc42008-09-11 00:01:49 +0200664 ieee80211_mesh_housekeeping(sdata, ifmsh);
Rui Pauloe304bfd2009-11-09 23:46:56 +0000665
666 if (test_and_clear_bit(MESH_WORK_ROOT, &ifmsh->wrkq_flags))
667 ieee80211_mesh_rootpath(sdata);
Johannes Berg472dbc42008-09-11 00:01:49 +0200668}
669
670void ieee80211_mesh_notify_scan_completed(struct ieee80211_local *local)
671{
672 struct ieee80211_sub_if_data *sdata;
673
674 rcu_read_lock();
675 list_for_each_entry_rcu(sdata, &local->interfaces, list)
676 if (ieee80211_vif_is_mesh(&sdata->vif))
Johannes Berg64592c82010-06-10 10:21:31 +0200677 ieee80211_queue_work(&local->hw, &sdata->work);
Johannes Berg472dbc42008-09-11 00:01:49 +0200678 rcu_read_unlock();
679}
680
Johannes Berg902acc72008-02-23 15:17:19 +0100681void ieee80211_mesh_init_sdata(struct ieee80211_sub_if_data *sdata)
682{
Johannes Berg472dbc42008-09-11 00:01:49 +0200683 struct ieee80211_if_mesh *ifmsh = &sdata->u.mesh;
Johannes Berg902acc72008-02-23 15:17:19 +0100684
Johannes Berg472dbc42008-09-11 00:01:49 +0200685 setup_timer(&ifmsh->housekeeping_timer,
686 ieee80211_mesh_housekeeping_timer,
687 (unsigned long) sdata);
Johannes Berg472dbc42008-09-11 00:01:49 +0200688
Johannes Berg472dbc42008-09-11 00:01:49 +0200689 ifmsh->accepting_plinks = true;
690 ifmsh->preq_id = 0;
Rui Paulod19b3bf2009-11-09 23:46:55 +0000691 ifmsh->sn = 0;
Johannes Berg472dbc42008-09-11 00:01:49 +0200692 atomic_set(&ifmsh->mpaths, 0);
Jasper Bryant-Greenef698d852008-08-03 12:04:37 +1200693 mesh_rmc_init(sdata);
Johannes Berg472dbc42008-09-11 00:01:49 +0200694 ifmsh->last_preq = jiffies;
Johannes Berg902acc72008-02-23 15:17:19 +0100695 /* Allocate all mesh structures when creating the first mesh interface. */
696 if (!mesh_allocated)
697 ieee80211s_init();
Johannes Berg472dbc42008-09-11 00:01:49 +0200698 mesh_ids_set_default(ifmsh);
699 setup_timer(&ifmsh->mesh_path_timer,
Johannes Berg902acc72008-02-23 15:17:19 +0100700 ieee80211_mesh_path_timer,
701 (unsigned long) sdata);
Rui Pauloe304bfd2009-11-09 23:46:56 +0000702 setup_timer(&ifmsh->mesh_path_root_timer,
703 ieee80211_mesh_path_root_timer,
704 (unsigned long) sdata);
Johannes Berg472dbc42008-09-11 00:01:49 +0200705 INIT_LIST_HEAD(&ifmsh->preq_queue.list);
706 spin_lock_init(&ifmsh->mesh_preq_queue_lock);
707}