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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
Luis R. Rodriguezc03e20f2009-08-04 15:06:26 -070057 ieee80211_queue_work(&local->hw, &ifmsh->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;
290
291 return;
292}
293
Jasper Bryant-Greenef698d852008-08-03 12:04:37 +1200294u32 mesh_table_hash(u8 *addr, struct ieee80211_sub_if_data *sdata, struct mesh_table *tbl)
Luis Carlos Cobo2e3c8732008-02-23 15:17:09 +0100295{
296 /* Use last four bytes of hw addr and interface index as hash index */
Jasper Bryant-Greenef698d852008-08-03 12:04:37 +1200297 return jhash_2words(*(u32 *)(addr+2), sdata->dev->ifindex, tbl->hash_rnd)
Luis Carlos Cobo2e3c8732008-02-23 15:17:09 +0100298 & tbl->hash_mask;
299}
300
Luis Carlos Cobo2e3c8732008-02-23 15:17:09 +0100301struct mesh_table *mesh_table_alloc(int size_order)
302{
303 int i;
304 struct mesh_table *newtbl;
305
306 newtbl = kmalloc(sizeof(struct mesh_table), GFP_KERNEL);
307 if (!newtbl)
308 return NULL;
309
310 newtbl->hash_buckets = kzalloc(sizeof(struct hlist_head) *
311 (1 << size_order), GFP_KERNEL);
312
313 if (!newtbl->hash_buckets) {
314 kfree(newtbl);
315 return NULL;
316 }
317
318 newtbl->hashwlock = kmalloc(sizeof(spinlock_t) *
319 (1 << size_order), GFP_KERNEL);
320 if (!newtbl->hashwlock) {
321 kfree(newtbl->hash_buckets);
322 kfree(newtbl);
323 return NULL;
324 }
325
326 newtbl->size_order = size_order;
327 newtbl->hash_mask = (1 << size_order) - 1;
328 atomic_set(&newtbl->entries, 0);
329 get_random_bytes(&newtbl->hash_rnd,
330 sizeof(newtbl->hash_rnd));
331 for (i = 0; i <= newtbl->hash_mask; i++)
332 spin_lock_init(&newtbl->hashwlock[i]);
333
334 return newtbl;
335}
336
Luis Carlos Cobo2e3c8732008-02-23 15:17:09 +0100337
338static void ieee80211_mesh_path_timer(unsigned long data)
339{
340 struct ieee80211_sub_if_data *sdata =
341 (struct ieee80211_sub_if_data *) data;
Johannes Berg472dbc42008-09-11 00:01:49 +0200342 struct ieee80211_if_mesh *ifmsh = &sdata->u.mesh;
Johannes Berg133b8222008-09-16 14:18:59 +0200343 struct ieee80211_local *local = sdata->local;
Luis Carlos Cobo2e3c8732008-02-23 15:17:09 +0100344
Johannes Berg5bb644a2009-05-17 11:40:42 +0200345 if (local->quiescing) {
346 set_bit(TMR_RUNNING_MP, &ifmsh->timers_running);
347 return;
348 }
349
Luis R. Rodriguezc03e20f2009-08-04 15:06:26 -0700350 ieee80211_queue_work(&local->hw, &ifmsh->work);
Luis Carlos Cobo2e3c8732008-02-23 15:17:09 +0100351}
352
Rui Pauloe304bfd2009-11-09 23:46:56 +0000353static void ieee80211_mesh_path_root_timer(unsigned long data)
354{
355 struct ieee80211_sub_if_data *sdata =
356 (struct ieee80211_sub_if_data *) data;
357 struct ieee80211_if_mesh *ifmsh = &sdata->u.mesh;
358 struct ieee80211_local *local = sdata->local;
359
360 set_bit(MESH_WORK_ROOT, &ifmsh->wrkq_flags);
361
362 if (local->quiescing) {
363 set_bit(TMR_RUNNING_MPR, &ifmsh->timers_running);
364 return;
365 }
366
367 ieee80211_queue_work(&local->hw, &ifmsh->work);
368}
369
Rui Paulo63c57232009-11-09 23:46:57 +0000370void ieee80211_mesh_root_setup(struct ieee80211_if_mesh *ifmsh)
371{
372 if (ifmsh->mshcfg.dot11MeshHWMPRootMode)
373 set_bit(MESH_WORK_ROOT, &ifmsh->wrkq_flags);
374 else {
375 clear_bit(MESH_WORK_ROOT, &ifmsh->wrkq_flags);
376 /* stop running timer */
377 del_timer_sync(&ifmsh->mesh_path_root_timer);
378 }
379}
380
Johannes Berg902acc72008-02-23 15:17:19 +0100381/**
Javier Cardona3c5772a2009-08-10 12:15:48 -0700382 * ieee80211_fill_mesh_addresses - fill addresses of a locally originated mesh frame
383 * @hdr: 802.11 frame header
384 * @fc: frame control field
385 * @meshda: destination address in the mesh
386 * @meshsa: source address address in the mesh. Same as TA, as frame is
387 * locally originated.
388 *
389 * Return the length of the 802.11 (does not include a mesh control header)
390 */
Johannes Berg15ff6362009-11-17 13:34:04 +0100391int ieee80211_fill_mesh_addresses(struct ieee80211_hdr *hdr, __le16 *fc,
392 const u8 *meshda, const u8 *meshsa)
393{
Javier Cardona3c5772a2009-08-10 12:15:48 -0700394 if (is_multicast_ether_addr(meshda)) {
395 *fc |= cpu_to_le16(IEEE80211_FCTL_FROMDS);
396 /* DA TA SA */
397 memcpy(hdr->addr1, meshda, ETH_ALEN);
398 memcpy(hdr->addr2, meshsa, ETH_ALEN);
399 memcpy(hdr->addr3, meshsa, ETH_ALEN);
400 return 24;
401 } else {
402 *fc |= cpu_to_le16(IEEE80211_FCTL_FROMDS |
403 IEEE80211_FCTL_TODS);
404 /* RA TA DA SA */
405 memset(hdr->addr1, 0, ETH_ALEN); /* RA is resolved later */
406 memcpy(hdr->addr2, meshsa, ETH_ALEN);
407 memcpy(hdr->addr3, meshda, ETH_ALEN);
408 memcpy(hdr->addr4, meshsa, ETH_ALEN);
409 return 30;
410 }
411}
412
413/**
Johannes Berg902acc72008-02-23 15:17:19 +0100414 * ieee80211_new_mesh_header - create a new mesh header
415 * @meshhdr: uninitialized mesh header
416 * @sdata: mesh interface to be used
Javier Cardona3c5772a2009-08-10 12:15:48 -0700417 * @addr4: addr4 of the mesh frame (1st in ae header)
418 * may be NULL
419 * @addr5: addr5 of the mesh frame (1st or 2nd in ae header)
420 * may be NULL unless addr6 is present
421 * @addr6: addr6 of the mesh frame (2nd or 3rd in ae header)
422 * may be NULL unless addr5 is present
Johannes Berg902acc72008-02-23 15:17:19 +0100423 *
424 * Return the header length.
425 */
426int ieee80211_new_mesh_header(struct ieee80211s_hdr *meshhdr,
Javier Cardona3c5772a2009-08-10 12:15:48 -0700427 struct ieee80211_sub_if_data *sdata, char *addr4,
428 char *addr5, char *addr6)
Johannes Berg902acc72008-02-23 15:17:19 +0100429{
Javier Cardona3c5772a2009-08-10 12:15:48 -0700430 int aelen = 0;
Julia Lawall0c3cee72009-12-09 20:25:59 +0100431 memset(meshhdr, 0, sizeof(*meshhdr));
Johannes Berg472dbc42008-09-11 00:01:49 +0200432 meshhdr->ttl = sdata->u.mesh.mshcfg.dot11MeshTTL;
433 put_unaligned(cpu_to_le32(sdata->u.mesh.mesh_seqnum), &meshhdr->seqnum);
434 sdata->u.mesh.mesh_seqnum++;
Javier Cardona3c5772a2009-08-10 12:15:48 -0700435 if (addr4) {
436 meshhdr->flags |= MESH_FLAGS_AE_A4;
437 aelen += ETH_ALEN;
438 memcpy(meshhdr->eaddr1, addr4, ETH_ALEN);
439 }
440 if (addr5 && addr6) {
441 meshhdr->flags |= MESH_FLAGS_AE_A5_A6;
442 aelen += 2 * ETH_ALEN;
443 if (!addr4) {
444 memcpy(meshhdr->eaddr1, addr5, ETH_ALEN);
445 memcpy(meshhdr->eaddr2, addr6, ETH_ALEN);
446 } else {
447 memcpy(meshhdr->eaddr2, addr5, ETH_ALEN);
448 memcpy(meshhdr->eaddr3, addr6, ETH_ALEN);
449 }
450 }
451 return 6 + aelen;
Johannes Berg902acc72008-02-23 15:17:19 +0100452}
453
Johannes Berg472dbc42008-09-11 00:01:49 +0200454static void ieee80211_mesh_housekeeping(struct ieee80211_sub_if_data *sdata,
455 struct ieee80211_if_mesh *ifmsh)
456{
457 bool free_plinks;
458
459#ifdef CONFIG_MAC80211_VERBOSE_DEBUG
460 printk(KERN_DEBUG "%s: running mesh housekeeping\n",
Johannes Berg47846c92009-11-25 17:46:19 +0100461 sdata->name);
Johannes Berg472dbc42008-09-11 00:01:49 +0200462#endif
463
464 ieee80211_sta_expire(sdata, IEEE80211_MESH_PEER_INACTIVITY_LIMIT);
465 mesh_path_expire(sdata);
466
467 free_plinks = mesh_plink_availables(sdata);
468 if (free_plinks != sdata->u.mesh.accepting_plinks)
Johannes Berg2d0ddec2009-04-23 16:13:26 +0200469 ieee80211_bss_info_change_notify(sdata, BSS_CHANGED_BEACON);
Johannes Berg472dbc42008-09-11 00:01:49 +0200470
Johannes Berg472dbc42008-09-11 00:01:49 +0200471 mod_timer(&ifmsh->housekeeping_timer,
472 round_jiffies(jiffies + IEEE80211_MESH_HOUSEKEEPING_INTERVAL));
473}
474
Rui Pauloe304bfd2009-11-09 23:46:56 +0000475static void ieee80211_mesh_rootpath(struct ieee80211_sub_if_data *sdata)
476{
477 struct ieee80211_if_mesh *ifmsh = &sdata->u.mesh;
478
479 mesh_path_tx_root_frame(sdata);
480 mod_timer(&ifmsh->mesh_path_root_timer,
481 round_jiffies(jiffies + IEEE80211_MESH_RANN_INTERVAL));
482}
483
Johannes Berg5bb644a2009-05-17 11:40:42 +0200484#ifdef CONFIG_PM
485void ieee80211_mesh_quiesce(struct ieee80211_sub_if_data *sdata)
486{
487 struct ieee80211_if_mesh *ifmsh = &sdata->u.mesh;
488
489 /* might restart the timer but that doesn't matter */
490 cancel_work_sync(&ifmsh->work);
491
492 /* use atomic bitops in case both timers fire at the same time */
493
494 if (del_timer_sync(&ifmsh->housekeeping_timer))
495 set_bit(TMR_RUNNING_HK, &ifmsh->timers_running);
496 if (del_timer_sync(&ifmsh->mesh_path_timer))
497 set_bit(TMR_RUNNING_MP, &ifmsh->timers_running);
Rui Pauloe304bfd2009-11-09 23:46:56 +0000498 if (del_timer_sync(&ifmsh->mesh_path_root_timer))
499 set_bit(TMR_RUNNING_MPR, &ifmsh->timers_running);
Johannes Berg5bb644a2009-05-17 11:40:42 +0200500}
501
502void ieee80211_mesh_restart(struct ieee80211_sub_if_data *sdata)
503{
504 struct ieee80211_if_mesh *ifmsh = &sdata->u.mesh;
505
506 if (test_and_clear_bit(TMR_RUNNING_HK, &ifmsh->timers_running))
507 add_timer(&ifmsh->housekeeping_timer);
508 if (test_and_clear_bit(TMR_RUNNING_MP, &ifmsh->timers_running))
509 add_timer(&ifmsh->mesh_path_timer);
Rui Pauloe304bfd2009-11-09 23:46:56 +0000510 if (test_and_clear_bit(TMR_RUNNING_MPR, &ifmsh->timers_running))
511 add_timer(&ifmsh->mesh_path_root_timer);
Rui Paulo63c57232009-11-09 23:46:57 +0000512 ieee80211_mesh_root_setup(ifmsh);
Johannes Berg5bb644a2009-05-17 11:40:42 +0200513}
514#endif
Johannes Berg472dbc42008-09-11 00:01:49 +0200515
516void ieee80211_start_mesh(struct ieee80211_sub_if_data *sdata)
517{
518 struct ieee80211_if_mesh *ifmsh = &sdata->u.mesh;
519 struct ieee80211_local *local = sdata->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);
Javier Cardona18889232009-08-10 12:15:52 -0700523 ieee80211_queue_work(&local->hw, &ifmsh->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{
532 del_timer_sync(&sdata->u.mesh.housekeeping_timer);
Rui Pauloe304bfd2009-11-09 23:46:56 +0000533 del_timer_sync(&sdata->u.mesh.mesh_path_root_timer);
Johannes Berg472dbc42008-09-11 00:01:49 +0200534 /*
Johannes Bergb7413432008-09-11 00:01:50 +0200535 * If the timer fired while we waited for it, it will have
536 * requeued the work. Now the work will be running again
537 * but will not rearm the timer again because it checks
538 * whether the interface is running, which, at this point,
539 * it no longer is.
540 */
541 cancel_work_sync(&sdata->u.mesh.work);
542
543 /*
Johannes Berg472dbc42008-09-11 00:01:49 +0200544 * When we get here, the interface is marked down.
545 * Call synchronize_rcu() to wait for the RX path
546 * should it be using the interface and enqueuing
547 * frames at this very time on another CPU.
548 */
Jesper Dangaard Brouer4a270962009-06-26 10:45:53 +0000549 rcu_barrier(); /* Wait for RX path and call_rcu()'s */
Johannes Berg472dbc42008-09-11 00:01:49 +0200550 skb_queue_purge(&sdata->u.mesh.skb_queue);
551}
552
553static void ieee80211_mesh_rx_bcn_presp(struct ieee80211_sub_if_data *sdata,
554 u16 stype,
555 struct ieee80211_mgmt *mgmt,
556 size_t len,
557 struct ieee80211_rx_status *rx_status)
558{
Johannes Bergc6a1fa12008-10-07 12:04:32 +0200559 struct ieee80211_local *local = sdata->local;
Johannes Berg472dbc42008-09-11 00:01:49 +0200560 struct ieee802_11_elems elems;
561 struct ieee80211_channel *channel;
Johannes Berg881d9482009-01-21 15:13:48 +0100562 u32 supp_rates = 0;
Johannes Berg472dbc42008-09-11 00:01:49 +0200563 size_t baselen;
564 int freq;
565 enum ieee80211_band band = rx_status->band;
566
567 /* ignore ProbeResp to foreign address */
568 if (stype == IEEE80211_STYPE_PROBE_RESP &&
Johannes Berg47846c92009-11-25 17:46:19 +0100569 compare_ether_addr(mgmt->da, sdata->vif.addr))
Johannes Berg472dbc42008-09-11 00:01:49 +0200570 return;
571
572 baselen = (u8 *) mgmt->u.probe_resp.variable - (u8 *) mgmt;
573 if (baselen > len)
574 return;
575
576 ieee802_11_parse_elems(mgmt->u.probe_resp.variable, len - baselen,
577 &elems);
578
579 if (elems.ds_params && elems.ds_params_len == 1)
580 freq = ieee80211_channel_to_frequency(elems.ds_params[0]);
581 else
582 freq = rx_status->freq;
583
584 channel = ieee80211_get_channel(local->hw.wiphy, freq);
585
586 if (!channel || channel->flags & IEEE80211_CHAN_DISABLED)
587 return;
588
589 if (elems.mesh_id && elems.mesh_config &&
590 mesh_matches_local(&elems, sdata)) {
591 supp_rates = ieee80211_sta_get_rates(local, &elems, band);
592
593 mesh_neighbour_update(mgmt->sa, supp_rates, sdata,
594 mesh_peer_accepts_plinks(&elems));
595 }
596}
597
598static void ieee80211_mesh_rx_mgmt_action(struct ieee80211_sub_if_data *sdata,
599 struct ieee80211_mgmt *mgmt,
600 size_t len,
601 struct ieee80211_rx_status *rx_status)
602{
603 switch (mgmt->u.action.category) {
Rui Paulo09383932009-11-09 23:46:43 +0000604 case MESH_PLINK_CATEGORY:
Johannes Berg472dbc42008-09-11 00:01:49 +0200605 mesh_rx_plink_frame(sdata, mgmt, len, rx_status);
606 break;
607 case MESH_PATH_SEL_CATEGORY:
608 mesh_rx_path_sel_frame(sdata, mgmt, len);
609 break;
610 }
611}
612
613static void ieee80211_mesh_rx_queued_mgmt(struct ieee80211_sub_if_data *sdata,
614 struct sk_buff *skb)
615{
616 struct ieee80211_rx_status *rx_status;
617 struct ieee80211_if_mesh *ifmsh;
618 struct ieee80211_mgmt *mgmt;
619 u16 stype;
620
621 ifmsh = &sdata->u.mesh;
622
Johannes Bergf1d58c22009-06-17 13:13:00 +0200623 rx_status = IEEE80211_SKB_RXCB(skb);
Johannes Berg472dbc42008-09-11 00:01:49 +0200624 mgmt = (struct ieee80211_mgmt *) skb->data;
625 stype = le16_to_cpu(mgmt->frame_control) & IEEE80211_FCTL_STYPE;
626
627 switch (stype) {
628 case IEEE80211_STYPE_PROBE_RESP:
629 case IEEE80211_STYPE_BEACON:
630 ieee80211_mesh_rx_bcn_presp(sdata, stype, mgmt, skb->len,
631 rx_status);
632 break;
633 case IEEE80211_STYPE_ACTION:
634 ieee80211_mesh_rx_mgmt_action(sdata, mgmt, skb->len, rx_status);
635 break;
636 }
637
638 kfree_skb(skb);
639}
640
641static void ieee80211_mesh_work(struct work_struct *work)
642{
643 struct ieee80211_sub_if_data *sdata =
644 container_of(work, struct ieee80211_sub_if_data, u.mesh.work);
645 struct ieee80211_local *local = sdata->local;
646 struct ieee80211_if_mesh *ifmsh = &sdata->u.mesh;
647 struct sk_buff *skb;
648
Johannes Berg9607e6b2009-12-23 13:15:31 +0100649 if (!ieee80211_sdata_running(sdata))
Johannes Berg472dbc42008-09-11 00:01:49 +0200650 return;
651
Helmut Schaafbe9c422009-07-23 12:14:04 +0200652 if (local->scanning)
Johannes Berg472dbc42008-09-11 00:01:49 +0200653 return;
654
655 while ((skb = skb_dequeue(&ifmsh->skb_queue)))
656 ieee80211_mesh_rx_queued_mgmt(sdata, skb);
657
658 if (ifmsh->preq_queue_len &&
659 time_after(jiffies,
660 ifmsh->last_preq + msecs_to_jiffies(ifmsh->mshcfg.dot11MeshHWMPpreqMinInterval)))
661 mesh_path_start_discovery(sdata);
662
Javier Cardona18889232009-08-10 12:15:52 -0700663 if (test_and_clear_bit(MESH_WORK_GROW_MPATH_TABLE, &ifmsh->wrkq_flags))
664 mesh_mpath_table_grow();
665
666 if (test_and_clear_bit(MESH_WORK_GROW_MPATH_TABLE, &ifmsh->wrkq_flags))
667 mesh_mpp_table_grow();
668
669 if (test_and_clear_bit(MESH_WORK_HOUSEKEEPING, &ifmsh->wrkq_flags))
Johannes Berg472dbc42008-09-11 00:01:49 +0200670 ieee80211_mesh_housekeeping(sdata, ifmsh);
Rui Pauloe304bfd2009-11-09 23:46:56 +0000671
672 if (test_and_clear_bit(MESH_WORK_ROOT, &ifmsh->wrkq_flags))
673 ieee80211_mesh_rootpath(sdata);
Johannes Berg472dbc42008-09-11 00:01:49 +0200674}
675
676void ieee80211_mesh_notify_scan_completed(struct ieee80211_local *local)
677{
678 struct ieee80211_sub_if_data *sdata;
679
680 rcu_read_lock();
681 list_for_each_entry_rcu(sdata, &local->interfaces, list)
682 if (ieee80211_vif_is_mesh(&sdata->vif))
Luis R. Rodriguezc03e20f2009-08-04 15:06:26 -0700683 ieee80211_queue_work(&local->hw, &sdata->u.mesh.work);
Johannes Berg472dbc42008-09-11 00:01:49 +0200684 rcu_read_unlock();
685}
686
Johannes Berg902acc72008-02-23 15:17:19 +0100687void ieee80211_mesh_init_sdata(struct ieee80211_sub_if_data *sdata)
688{
Johannes Berg472dbc42008-09-11 00:01:49 +0200689 struct ieee80211_if_mesh *ifmsh = &sdata->u.mesh;
Johannes Berg902acc72008-02-23 15:17:19 +0100690
Johannes Berg472dbc42008-09-11 00:01:49 +0200691 INIT_WORK(&ifmsh->work, ieee80211_mesh_work);
692 setup_timer(&ifmsh->housekeeping_timer,
693 ieee80211_mesh_housekeeping_timer,
694 (unsigned long) sdata);
695 skb_queue_head_init(&sdata->u.mesh.skb_queue);
696
697 ifmsh->mshcfg.dot11MeshRetryTimeout = MESH_RET_T;
698 ifmsh->mshcfg.dot11MeshConfirmTimeout = MESH_CONF_T;
699 ifmsh->mshcfg.dot11MeshHoldingTimeout = MESH_HOLD_T;
700 ifmsh->mshcfg.dot11MeshMaxRetries = MESH_MAX_RETR;
701 ifmsh->mshcfg.dot11MeshTTL = MESH_TTL;
702 ifmsh->mshcfg.auto_open_plinks = true;
703 ifmsh->mshcfg.dot11MeshMaxPeerLinks =
Johannes Berg902acc72008-02-23 15:17:19 +0100704 MESH_MAX_ESTAB_PLINKS;
Johannes Berg472dbc42008-09-11 00:01:49 +0200705 ifmsh->mshcfg.dot11MeshHWMPactivePathTimeout =
Johannes Berg902acc72008-02-23 15:17:19 +0100706 MESH_PATH_TIMEOUT;
Johannes Berg472dbc42008-09-11 00:01:49 +0200707 ifmsh->mshcfg.dot11MeshHWMPpreqMinInterval =
Johannes Berg902acc72008-02-23 15:17:19 +0100708 MESH_PREQ_MIN_INT;
Johannes Berg472dbc42008-09-11 00:01:49 +0200709 ifmsh->mshcfg.dot11MeshHWMPnetDiameterTraversalTime =
Johannes Berg902acc72008-02-23 15:17:19 +0100710 MESH_DIAM_TRAVERSAL_TIME;
Johannes Berg472dbc42008-09-11 00:01:49 +0200711 ifmsh->mshcfg.dot11MeshHWMPmaxPREQretries =
Johannes Berg902acc72008-02-23 15:17:19 +0100712 MESH_MAX_PREQ_RETRIES;
Johannes Berg472dbc42008-09-11 00:01:49 +0200713 ifmsh->mshcfg.path_refresh_time =
Johannes Berg902acc72008-02-23 15:17:19 +0100714 MESH_PATH_REFRESH_TIME;
Johannes Berg472dbc42008-09-11 00:01:49 +0200715 ifmsh->mshcfg.min_discovery_timeout =
Johannes Berg902acc72008-02-23 15:17:19 +0100716 MESH_MIN_DISCOVERY_TIMEOUT;
Johannes Berg472dbc42008-09-11 00:01:49 +0200717 ifmsh->accepting_plinks = true;
718 ifmsh->preq_id = 0;
Rui Paulod19b3bf2009-11-09 23:46:55 +0000719 ifmsh->sn = 0;
Johannes Berg472dbc42008-09-11 00:01:49 +0200720 atomic_set(&ifmsh->mpaths, 0);
Jasper Bryant-Greenef698d852008-08-03 12:04:37 +1200721 mesh_rmc_init(sdata);
Johannes Berg472dbc42008-09-11 00:01:49 +0200722 ifmsh->last_preq = jiffies;
Johannes Berg902acc72008-02-23 15:17:19 +0100723 /* Allocate all mesh structures when creating the first mesh interface. */
724 if (!mesh_allocated)
725 ieee80211s_init();
Johannes Berg472dbc42008-09-11 00:01:49 +0200726 mesh_ids_set_default(ifmsh);
727 setup_timer(&ifmsh->mesh_path_timer,
Johannes Berg902acc72008-02-23 15:17:19 +0100728 ieee80211_mesh_path_timer,
729 (unsigned long) sdata);
Rui Pauloe304bfd2009-11-09 23:46:56 +0000730 setup_timer(&ifmsh->mesh_path_root_timer,
731 ieee80211_mesh_path_root_timer,
732 (unsigned long) sdata);
Johannes Berg472dbc42008-09-11 00:01:49 +0200733 INIT_LIST_HEAD(&ifmsh->preq_queue.list);
734 spin_lock_init(&ifmsh->mesh_preq_queue_lock);
735}
736
737ieee80211_rx_result
Johannes Bergf1d58c22009-06-17 13:13:00 +0200738ieee80211_mesh_rx_mgmt(struct ieee80211_sub_if_data *sdata, struct sk_buff *skb)
Johannes Berg472dbc42008-09-11 00:01:49 +0200739{
740 struct ieee80211_local *local = sdata->local;
741 struct ieee80211_if_mesh *ifmsh = &sdata->u.mesh;
742 struct ieee80211_mgmt *mgmt;
743 u16 fc;
744
745 if (skb->len < 24)
746 return RX_DROP_MONITOR;
747
748 mgmt = (struct ieee80211_mgmt *) skb->data;
749 fc = le16_to_cpu(mgmt->frame_control);
750
751 switch (fc & IEEE80211_FCTL_STYPE) {
Johannes Berga43816d2009-07-10 11:39:26 +0200752 case IEEE80211_STYPE_ACTION:
Johannes Berg472dbc42008-09-11 00:01:49 +0200753 case IEEE80211_STYPE_PROBE_RESP:
754 case IEEE80211_STYPE_BEACON:
Johannes Berg472dbc42008-09-11 00:01:49 +0200755 skb_queue_tail(&ifmsh->skb_queue, skb);
Luis R. Rodriguezc03e20f2009-08-04 15:06:26 -0700756 ieee80211_queue_work(&local->hw, &ifmsh->work);
Johannes Berg472dbc42008-09-11 00:01:49 +0200757 return RX_QUEUED;
758 }
759
760 return RX_CONTINUE;
Johannes Berg902acc72008-02-23 15:17:19 +0100761}