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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
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;
Luis Carlos Cobo2e3c8732008-02-23 15:17:09 +0100290}
291
Jasper Bryant-Greenef698d852008-08-03 12:04:37 +1200292u32 mesh_table_hash(u8 *addr, struct ieee80211_sub_if_data *sdata, struct mesh_table *tbl)
Luis Carlos Cobo2e3c8732008-02-23 15:17:09 +0100293{
294 /* Use last four bytes of hw addr and interface index as hash index */
Jasper Bryant-Greenef698d852008-08-03 12:04:37 +1200295 return jhash_2words(*(u32 *)(addr+2), sdata->dev->ifindex, tbl->hash_rnd)
Luis Carlos Cobo2e3c8732008-02-23 15:17:09 +0100296 & tbl->hash_mask;
297}
298
Luis Carlos Cobo2e3c8732008-02-23 15:17:09 +0100299struct mesh_table *mesh_table_alloc(int size_order)
300{
301 int i;
302 struct mesh_table *newtbl;
303
304 newtbl = kmalloc(sizeof(struct mesh_table), GFP_KERNEL);
305 if (!newtbl)
306 return NULL;
307
308 newtbl->hash_buckets = kzalloc(sizeof(struct hlist_head) *
309 (1 << size_order), GFP_KERNEL);
310
311 if (!newtbl->hash_buckets) {
312 kfree(newtbl);
313 return NULL;
314 }
315
316 newtbl->hashwlock = kmalloc(sizeof(spinlock_t) *
317 (1 << size_order), GFP_KERNEL);
318 if (!newtbl->hashwlock) {
319 kfree(newtbl->hash_buckets);
320 kfree(newtbl);
321 return NULL;
322 }
323
324 newtbl->size_order = size_order;
325 newtbl->hash_mask = (1 << size_order) - 1;
326 atomic_set(&newtbl->entries, 0);
327 get_random_bytes(&newtbl->hash_rnd,
328 sizeof(newtbl->hash_rnd));
329 for (i = 0; i <= newtbl->hash_mask; i++)
330 spin_lock_init(&newtbl->hashwlock[i]);
331
332 return newtbl;
333}
334
Luis Carlos Cobo2e3c8732008-02-23 15:17:09 +0100335
336static void ieee80211_mesh_path_timer(unsigned long data)
337{
338 struct ieee80211_sub_if_data *sdata =
339 (struct ieee80211_sub_if_data *) data;
Johannes Berg472dbc42008-09-11 00:01:49 +0200340 struct ieee80211_if_mesh *ifmsh = &sdata->u.mesh;
Johannes Berg133b8222008-09-16 14:18:59 +0200341 struct ieee80211_local *local = sdata->local;
Luis Carlos Cobo2e3c8732008-02-23 15:17:09 +0100342
Johannes Berg5bb644a2009-05-17 11:40:42 +0200343 if (local->quiescing) {
344 set_bit(TMR_RUNNING_MP, &ifmsh->timers_running);
345 return;
346 }
347
Johannes Berg64592c82010-06-10 10:21:31 +0200348 ieee80211_queue_work(&local->hw, &sdata->work);
Luis Carlos Cobo2e3c8732008-02-23 15:17:09 +0100349}
350
Rui Pauloe304bfd2009-11-09 23:46:56 +0000351static void ieee80211_mesh_path_root_timer(unsigned long data)
352{
353 struct ieee80211_sub_if_data *sdata =
354 (struct ieee80211_sub_if_data *) data;
355 struct ieee80211_if_mesh *ifmsh = &sdata->u.mesh;
356 struct ieee80211_local *local = sdata->local;
357
358 set_bit(MESH_WORK_ROOT, &ifmsh->wrkq_flags);
359
360 if (local->quiescing) {
361 set_bit(TMR_RUNNING_MPR, &ifmsh->timers_running);
362 return;
363 }
364
Johannes Berg64592c82010-06-10 10:21:31 +0200365 ieee80211_queue_work(&local->hw, &sdata->work);
Rui Pauloe304bfd2009-11-09 23:46:56 +0000366}
367
Rui Paulo63c57232009-11-09 23:46:57 +0000368void ieee80211_mesh_root_setup(struct ieee80211_if_mesh *ifmsh)
369{
370 if (ifmsh->mshcfg.dot11MeshHWMPRootMode)
371 set_bit(MESH_WORK_ROOT, &ifmsh->wrkq_flags);
372 else {
373 clear_bit(MESH_WORK_ROOT, &ifmsh->wrkq_flags);
374 /* stop running timer */
375 del_timer_sync(&ifmsh->mesh_path_root_timer);
376 }
377}
378
Johannes Berg902acc72008-02-23 15:17:19 +0100379/**
Javier Cardona3c5772a2009-08-10 12:15:48 -0700380 * ieee80211_fill_mesh_addresses - fill addresses of a locally originated mesh frame
381 * @hdr: 802.11 frame header
382 * @fc: frame control field
383 * @meshda: destination address in the mesh
384 * @meshsa: source address address in the mesh. Same as TA, as frame is
385 * locally originated.
386 *
387 * Return the length of the 802.11 (does not include a mesh control header)
388 */
Johannes Berg15ff6362009-11-17 13:34:04 +0100389int ieee80211_fill_mesh_addresses(struct ieee80211_hdr *hdr, __le16 *fc,
390 const u8 *meshda, const u8 *meshsa)
391{
Javier Cardona3c5772a2009-08-10 12:15:48 -0700392 if (is_multicast_ether_addr(meshda)) {
393 *fc |= cpu_to_le16(IEEE80211_FCTL_FROMDS);
394 /* DA TA SA */
395 memcpy(hdr->addr1, meshda, ETH_ALEN);
396 memcpy(hdr->addr2, meshsa, ETH_ALEN);
397 memcpy(hdr->addr3, meshsa, ETH_ALEN);
398 return 24;
399 } else {
400 *fc |= cpu_to_le16(IEEE80211_FCTL_FROMDS |
401 IEEE80211_FCTL_TODS);
402 /* RA TA DA SA */
403 memset(hdr->addr1, 0, ETH_ALEN); /* RA is resolved later */
404 memcpy(hdr->addr2, meshsa, ETH_ALEN);
405 memcpy(hdr->addr3, meshda, ETH_ALEN);
406 memcpy(hdr->addr4, meshsa, ETH_ALEN);
407 return 30;
408 }
409}
410
411/**
Johannes Berg902acc72008-02-23 15:17:19 +0100412 * ieee80211_new_mesh_header - create a new mesh header
413 * @meshhdr: uninitialized mesh header
414 * @sdata: mesh interface to be used
Javier Cardona3c5772a2009-08-10 12:15:48 -0700415 * @addr4: addr4 of the mesh frame (1st in ae header)
416 * may be NULL
417 * @addr5: addr5 of the mesh frame (1st or 2nd in ae header)
418 * may be NULL unless addr6 is present
419 * @addr6: addr6 of the mesh frame (2nd or 3rd in ae header)
420 * may be NULL unless addr5 is present
Johannes Berg902acc72008-02-23 15:17:19 +0100421 *
422 * Return the header length.
423 */
424int ieee80211_new_mesh_header(struct ieee80211s_hdr *meshhdr,
Javier Cardona3c5772a2009-08-10 12:15:48 -0700425 struct ieee80211_sub_if_data *sdata, char *addr4,
426 char *addr5, char *addr6)
Johannes Berg902acc72008-02-23 15:17:19 +0100427{
Javier Cardona3c5772a2009-08-10 12:15:48 -0700428 int aelen = 0;
Julia Lawall0c3cee72009-12-09 20:25:59 +0100429 memset(meshhdr, 0, sizeof(*meshhdr));
Johannes Berg472dbc42008-09-11 00:01:49 +0200430 meshhdr->ttl = sdata->u.mesh.mshcfg.dot11MeshTTL;
431 put_unaligned(cpu_to_le32(sdata->u.mesh.mesh_seqnum), &meshhdr->seqnum);
432 sdata->u.mesh.mesh_seqnum++;
Javier Cardona3c5772a2009-08-10 12:15:48 -0700433 if (addr4) {
434 meshhdr->flags |= MESH_FLAGS_AE_A4;
435 aelen += ETH_ALEN;
436 memcpy(meshhdr->eaddr1, addr4, ETH_ALEN);
437 }
438 if (addr5 && addr6) {
439 meshhdr->flags |= MESH_FLAGS_AE_A5_A6;
440 aelen += 2 * ETH_ALEN;
441 if (!addr4) {
442 memcpy(meshhdr->eaddr1, addr5, ETH_ALEN);
443 memcpy(meshhdr->eaddr2, addr6, ETH_ALEN);
444 } else {
445 memcpy(meshhdr->eaddr2, addr5, ETH_ALEN);
446 memcpy(meshhdr->eaddr3, addr6, ETH_ALEN);
447 }
448 }
449 return 6 + aelen;
Johannes Berg902acc72008-02-23 15:17:19 +0100450}
451
Johannes Berg472dbc42008-09-11 00:01:49 +0200452static void ieee80211_mesh_housekeeping(struct ieee80211_sub_if_data *sdata,
453 struct ieee80211_if_mesh *ifmsh)
454{
455 bool free_plinks;
456
457#ifdef CONFIG_MAC80211_VERBOSE_DEBUG
458 printk(KERN_DEBUG "%s: running mesh housekeeping\n",
Johannes Berg47846c92009-11-25 17:46:19 +0100459 sdata->name);
Johannes Berg472dbc42008-09-11 00:01:49 +0200460#endif
461
462 ieee80211_sta_expire(sdata, IEEE80211_MESH_PEER_INACTIVITY_LIMIT);
463 mesh_path_expire(sdata);
464
465 free_plinks = mesh_plink_availables(sdata);
466 if (free_plinks != sdata->u.mesh.accepting_plinks)
Johannes Berg2d0ddec2009-04-23 16:13:26 +0200467 ieee80211_bss_info_change_notify(sdata, BSS_CHANGED_BEACON);
Johannes Berg472dbc42008-09-11 00:01:49 +0200468
Johannes Berg472dbc42008-09-11 00:01:49 +0200469 mod_timer(&ifmsh->housekeeping_timer,
470 round_jiffies(jiffies + IEEE80211_MESH_HOUSEKEEPING_INTERVAL));
471}
472
Rui Pauloe304bfd2009-11-09 23:46:56 +0000473static void ieee80211_mesh_rootpath(struct ieee80211_sub_if_data *sdata)
474{
475 struct ieee80211_if_mesh *ifmsh = &sdata->u.mesh;
476
477 mesh_path_tx_root_frame(sdata);
478 mod_timer(&ifmsh->mesh_path_root_timer,
479 round_jiffies(jiffies + IEEE80211_MESH_RANN_INTERVAL));
480}
481
Johannes Berg5bb644a2009-05-17 11:40:42 +0200482#ifdef CONFIG_PM
483void ieee80211_mesh_quiesce(struct ieee80211_sub_if_data *sdata)
484{
485 struct ieee80211_if_mesh *ifmsh = &sdata->u.mesh;
486
Johannes Berg5bb644a2009-05-17 11:40:42 +0200487 /* use atomic bitops in case both timers fire at the same time */
488
489 if (del_timer_sync(&ifmsh->housekeeping_timer))
490 set_bit(TMR_RUNNING_HK, &ifmsh->timers_running);
491 if (del_timer_sync(&ifmsh->mesh_path_timer))
492 set_bit(TMR_RUNNING_MP, &ifmsh->timers_running);
Rui Pauloe304bfd2009-11-09 23:46:56 +0000493 if (del_timer_sync(&ifmsh->mesh_path_root_timer))
494 set_bit(TMR_RUNNING_MPR, &ifmsh->timers_running);
Johannes Berg5bb644a2009-05-17 11:40:42 +0200495}
496
497void ieee80211_mesh_restart(struct ieee80211_sub_if_data *sdata)
498{
499 struct ieee80211_if_mesh *ifmsh = &sdata->u.mesh;
500
501 if (test_and_clear_bit(TMR_RUNNING_HK, &ifmsh->timers_running))
502 add_timer(&ifmsh->housekeeping_timer);
503 if (test_and_clear_bit(TMR_RUNNING_MP, &ifmsh->timers_running))
504 add_timer(&ifmsh->mesh_path_timer);
Rui Pauloe304bfd2009-11-09 23:46:56 +0000505 if (test_and_clear_bit(TMR_RUNNING_MPR, &ifmsh->timers_running))
506 add_timer(&ifmsh->mesh_path_root_timer);
Rui Paulo63c57232009-11-09 23:46:57 +0000507 ieee80211_mesh_root_setup(ifmsh);
Johannes Berg5bb644a2009-05-17 11:40:42 +0200508}
509#endif
Johannes Berg472dbc42008-09-11 00:01:49 +0200510
511void ieee80211_start_mesh(struct ieee80211_sub_if_data *sdata)
512{
513 struct ieee80211_if_mesh *ifmsh = &sdata->u.mesh;
514 struct ieee80211_local *local = sdata->local;
515
Johannes Berg09b17472010-12-03 09:20:41 +0100516 local->fif_other_bss++;
517 /* mesh ifaces must set allmulti to forward mcast traffic */
518 atomic_inc(&local->iff_allmultis);
519 ieee80211_configure_filter(local);
520
Rui Paulo6b9ac442009-10-20 21:21:48 +0100521 set_bit(MESH_WORK_HOUSEKEEPING, &ifmsh->wrkq_flags);
Rui Paulo63c57232009-11-09 23:46:57 +0000522 ieee80211_mesh_root_setup(ifmsh);
Johannes Berg64592c82010-06-10 10:21:31 +0200523 ieee80211_queue_work(&local->hw, &sdata->work);
Javier Cardona5b365832009-08-10 12:15:51 -0700524 sdata->vif.bss_conf.beacon_int = MESH_DEFAULT_BEACON_INTERVAL;
Johannes Berg2d0ddec2009-04-23 16:13:26 +0200525 ieee80211_bss_info_change_notify(sdata, BSS_CHANGED_BEACON |
Javier Cardona5b365832009-08-10 12:15:51 -0700526 BSS_CHANGED_BEACON_ENABLED |
527 BSS_CHANGED_BEACON_INT);
Johannes Berg472dbc42008-09-11 00:01:49 +0200528}
529
530void ieee80211_stop_mesh(struct ieee80211_sub_if_data *sdata)
531{
Johannes Berg09b17472010-12-03 09:20:41 +0100532 struct ieee80211_local *local = sdata->local;
533
Johannes Berg472dbc42008-09-11 00:01:49 +0200534 del_timer_sync(&sdata->u.mesh.housekeeping_timer);
Rui Pauloe304bfd2009-11-09 23:46:56 +0000535 del_timer_sync(&sdata->u.mesh.mesh_path_root_timer);
Johannes Berg472dbc42008-09-11 00:01:49 +0200536 /*
Johannes Bergb7413432008-09-11 00:01:50 +0200537 * If the timer fired while we waited for it, it will have
538 * requeued the work. Now the work will be running again
539 * but will not rearm the timer again because it checks
540 * whether the interface is running, which, at this point,
541 * it no longer is.
542 */
Johannes Berg64592c82010-06-10 10:21:31 +0200543 cancel_work_sync(&sdata->work);
Johannes Berg09b17472010-12-03 09:20:41 +0100544
545 local->fif_other_bss--;
546 atomic_dec(&local->iff_allmultis);
547 ieee80211_configure_filter(local);
Johannes Berg472dbc42008-09-11 00:01:49 +0200548}
549
550static void ieee80211_mesh_rx_bcn_presp(struct ieee80211_sub_if_data *sdata,
551 u16 stype,
552 struct ieee80211_mgmt *mgmt,
553 size_t len,
554 struct ieee80211_rx_status *rx_status)
555{
Johannes Bergc6a1fa12008-10-07 12:04:32 +0200556 struct ieee80211_local *local = sdata->local;
Johannes Berg472dbc42008-09-11 00:01:49 +0200557 struct ieee802_11_elems elems;
558 struct ieee80211_channel *channel;
Johannes Berg881d9482009-01-21 15:13:48 +0100559 u32 supp_rates = 0;
Johannes Berg472dbc42008-09-11 00:01:49 +0200560 size_t baselen;
561 int freq;
562 enum ieee80211_band band = rx_status->band;
563
564 /* ignore ProbeResp to foreign address */
565 if (stype == IEEE80211_STYPE_PROBE_RESP &&
Johannes Berg47846c92009-11-25 17:46:19 +0100566 compare_ether_addr(mgmt->da, sdata->vif.addr))
Johannes Berg472dbc42008-09-11 00:01:49 +0200567 return;
568
569 baselen = (u8 *) mgmt->u.probe_resp.variable - (u8 *) mgmt;
570 if (baselen > len)
571 return;
572
573 ieee802_11_parse_elems(mgmt->u.probe_resp.variable, len - baselen,
574 &elems);
575
576 if (elems.ds_params && elems.ds_params_len == 1)
577 freq = ieee80211_channel_to_frequency(elems.ds_params[0]);
578 else
579 freq = rx_status->freq;
580
581 channel = ieee80211_get_channel(local->hw.wiphy, freq);
582
583 if (!channel || channel->flags & IEEE80211_CHAN_DISABLED)
584 return;
585
586 if (elems.mesh_id && elems.mesh_config &&
587 mesh_matches_local(&elems, sdata)) {
588 supp_rates = ieee80211_sta_get_rates(local, &elems, band);
589
590 mesh_neighbour_update(mgmt->sa, supp_rates, sdata,
591 mesh_peer_accepts_plinks(&elems));
592 }
593}
594
595static void ieee80211_mesh_rx_mgmt_action(struct ieee80211_sub_if_data *sdata,
596 struct ieee80211_mgmt *mgmt,
597 size_t len,
598 struct ieee80211_rx_status *rx_status)
599{
600 switch (mgmt->u.action.category) {
Javier Cardona97ad9132010-03-29 11:00:21 -0700601 case WLAN_CATEGORY_MESH_PLINK:
Johannes Berg472dbc42008-09-11 00:01:49 +0200602 mesh_rx_plink_frame(sdata, mgmt, len, rx_status);
603 break;
Javier Cardona97ad9132010-03-29 11:00:21 -0700604 case WLAN_CATEGORY_MESH_PATH_SEL:
Johannes Berg472dbc42008-09-11 00:01:49 +0200605 mesh_rx_path_sel_frame(sdata, mgmt, len);
606 break;
607 }
608}
609
Johannes Berg1fa57d02010-06-10 10:21:32 +0200610void ieee80211_mesh_rx_queued_mgmt(struct ieee80211_sub_if_data *sdata,
611 struct sk_buff *skb)
Johannes Berg472dbc42008-09-11 00:01:49 +0200612{
613 struct ieee80211_rx_status *rx_status;
614 struct ieee80211_if_mesh *ifmsh;
615 struct ieee80211_mgmt *mgmt;
616 u16 stype;
617
618 ifmsh = &sdata->u.mesh;
619
Johannes Bergf1d58c22009-06-17 13:13:00 +0200620 rx_status = IEEE80211_SKB_RXCB(skb);
Johannes Berg472dbc42008-09-11 00:01:49 +0200621 mgmt = (struct ieee80211_mgmt *) skb->data;
622 stype = le16_to_cpu(mgmt->frame_control) & IEEE80211_FCTL_STYPE;
623
624 switch (stype) {
625 case IEEE80211_STYPE_PROBE_RESP:
626 case IEEE80211_STYPE_BEACON:
627 ieee80211_mesh_rx_bcn_presp(sdata, stype, mgmt, skb->len,
628 rx_status);
629 break;
630 case IEEE80211_STYPE_ACTION:
631 ieee80211_mesh_rx_mgmt_action(sdata, mgmt, skb->len, rx_status);
632 break;
633 }
Johannes Berg472dbc42008-09-11 00:01:49 +0200634}
635
Johannes Berg1fa57d02010-06-10 10:21:32 +0200636void ieee80211_mesh_work(struct ieee80211_sub_if_data *sdata)
Johannes Berg472dbc42008-09-11 00:01:49 +0200637{
Johannes Berg472dbc42008-09-11 00:01:49 +0200638 struct ieee80211_if_mesh *ifmsh = &sdata->u.mesh;
Johannes Berg472dbc42008-09-11 00:01:49 +0200639
640 if (ifmsh->preq_queue_len &&
641 time_after(jiffies,
642 ifmsh->last_preq + msecs_to_jiffies(ifmsh->mshcfg.dot11MeshHWMPpreqMinInterval)))
643 mesh_path_start_discovery(sdata);
644
Javier Cardona18889232009-08-10 12:15:52 -0700645 if (test_and_clear_bit(MESH_WORK_GROW_MPATH_TABLE, &ifmsh->wrkq_flags))
646 mesh_mpath_table_grow();
647
648 if (test_and_clear_bit(MESH_WORK_GROW_MPATH_TABLE, &ifmsh->wrkq_flags))
649 mesh_mpp_table_grow();
650
651 if (test_and_clear_bit(MESH_WORK_HOUSEKEEPING, &ifmsh->wrkq_flags))
Johannes Berg472dbc42008-09-11 00:01:49 +0200652 ieee80211_mesh_housekeeping(sdata, ifmsh);
Rui Pauloe304bfd2009-11-09 23:46:56 +0000653
654 if (test_and_clear_bit(MESH_WORK_ROOT, &ifmsh->wrkq_flags))
655 ieee80211_mesh_rootpath(sdata);
Johannes Berg472dbc42008-09-11 00:01:49 +0200656}
657
658void ieee80211_mesh_notify_scan_completed(struct ieee80211_local *local)
659{
660 struct ieee80211_sub_if_data *sdata;
661
662 rcu_read_lock();
663 list_for_each_entry_rcu(sdata, &local->interfaces, list)
664 if (ieee80211_vif_is_mesh(&sdata->vif))
Johannes Berg64592c82010-06-10 10:21:31 +0200665 ieee80211_queue_work(&local->hw, &sdata->work);
Johannes Berg472dbc42008-09-11 00:01:49 +0200666 rcu_read_unlock();
667}
668
Johannes Berg902acc72008-02-23 15:17:19 +0100669void ieee80211_mesh_init_sdata(struct ieee80211_sub_if_data *sdata)
670{
Johannes Berg472dbc42008-09-11 00:01:49 +0200671 struct ieee80211_if_mesh *ifmsh = &sdata->u.mesh;
Johannes Berg902acc72008-02-23 15:17:19 +0100672
Johannes Berg472dbc42008-09-11 00:01:49 +0200673 setup_timer(&ifmsh->housekeeping_timer,
674 ieee80211_mesh_housekeeping_timer,
675 (unsigned long) sdata);
Johannes Berg472dbc42008-09-11 00:01:49 +0200676
677 ifmsh->mshcfg.dot11MeshRetryTimeout = MESH_RET_T;
678 ifmsh->mshcfg.dot11MeshConfirmTimeout = MESH_CONF_T;
679 ifmsh->mshcfg.dot11MeshHoldingTimeout = MESH_HOLD_T;
680 ifmsh->mshcfg.dot11MeshMaxRetries = MESH_MAX_RETR;
681 ifmsh->mshcfg.dot11MeshTTL = MESH_TTL;
Javier Cardona45904f22010-12-03 09:20:40 +0100682 ifmsh->mshcfg.element_ttl = MESH_DEFAULT_ELEMENT_TTL;
Johannes Berg472dbc42008-09-11 00:01:49 +0200683 ifmsh->mshcfg.auto_open_plinks = true;
684 ifmsh->mshcfg.dot11MeshMaxPeerLinks =
Johannes Berg902acc72008-02-23 15:17:19 +0100685 MESH_MAX_ESTAB_PLINKS;
Johannes Berg472dbc42008-09-11 00:01:49 +0200686 ifmsh->mshcfg.dot11MeshHWMPactivePathTimeout =
Johannes Berg902acc72008-02-23 15:17:19 +0100687 MESH_PATH_TIMEOUT;
Johannes Berg472dbc42008-09-11 00:01:49 +0200688 ifmsh->mshcfg.dot11MeshHWMPpreqMinInterval =
Johannes Berg902acc72008-02-23 15:17:19 +0100689 MESH_PREQ_MIN_INT;
Johannes Berg472dbc42008-09-11 00:01:49 +0200690 ifmsh->mshcfg.dot11MeshHWMPnetDiameterTraversalTime =
Johannes Berg902acc72008-02-23 15:17:19 +0100691 MESH_DIAM_TRAVERSAL_TIME;
Johannes Berg472dbc42008-09-11 00:01:49 +0200692 ifmsh->mshcfg.dot11MeshHWMPmaxPREQretries =
Johannes Berg902acc72008-02-23 15:17:19 +0100693 MESH_MAX_PREQ_RETRIES;
Johannes Berg472dbc42008-09-11 00:01:49 +0200694 ifmsh->mshcfg.path_refresh_time =
Johannes Berg902acc72008-02-23 15:17:19 +0100695 MESH_PATH_REFRESH_TIME;
Johannes Berg472dbc42008-09-11 00:01:49 +0200696 ifmsh->mshcfg.min_discovery_timeout =
Johannes Berg902acc72008-02-23 15:17:19 +0100697 MESH_MIN_DISCOVERY_TIMEOUT;
Johannes Berg472dbc42008-09-11 00:01:49 +0200698 ifmsh->accepting_plinks = true;
699 ifmsh->preq_id = 0;
Rui Paulod19b3bf2009-11-09 23:46:55 +0000700 ifmsh->sn = 0;
Johannes Berg472dbc42008-09-11 00:01:49 +0200701 atomic_set(&ifmsh->mpaths, 0);
Jasper Bryant-Greenef698d852008-08-03 12:04:37 +1200702 mesh_rmc_init(sdata);
Johannes Berg472dbc42008-09-11 00:01:49 +0200703 ifmsh->last_preq = jiffies;
Johannes Berg902acc72008-02-23 15:17:19 +0100704 /* Allocate all mesh structures when creating the first mesh interface. */
705 if (!mesh_allocated)
706 ieee80211s_init();
Johannes Berg472dbc42008-09-11 00:01:49 +0200707 mesh_ids_set_default(ifmsh);
708 setup_timer(&ifmsh->mesh_path_timer,
Johannes Berg902acc72008-02-23 15:17:19 +0100709 ieee80211_mesh_path_timer,
710 (unsigned long) sdata);
Rui Pauloe304bfd2009-11-09 23:46:56 +0000711 setup_timer(&ifmsh->mesh_path_root_timer,
712 ieee80211_mesh_path_root_timer,
713 (unsigned long) sdata);
Johannes Berg472dbc42008-09-11 00:01:49 +0200714 INIT_LIST_HEAD(&ifmsh->preq_queue.list);
715 spin_lock_init(&ifmsh->mesh_preq_queue_lock);
716}