blob: 2a57cc02c6189415387cbba01585778a7ab1674a [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
Jasper Bryant-Greenef698d852008-08-03 12:04:37 +1200127int mesh_rmc_init(struct ieee80211_sub_if_data *sdata)
Luis Carlos Cobo2e3c8732008-02-23 15:17:09 +0100128{
Luis Carlos Cobo2e3c8732008-02-23 15:17:09 +0100129 int i;
130
Johannes Berg472dbc42008-09-11 00:01:49 +0200131 sdata->u.mesh.rmc = kmalloc(sizeof(struct mesh_rmc), GFP_KERNEL);
132 if (!sdata->u.mesh.rmc)
Luis Carlos Cobo2e3c8732008-02-23 15:17:09 +0100133 return -ENOMEM;
Johannes Berg472dbc42008-09-11 00:01:49 +0200134 sdata->u.mesh.rmc->idx_mask = RMC_BUCKETS - 1;
Luis Carlos Cobo2e3c8732008-02-23 15:17:09 +0100135 for (i = 0; i < RMC_BUCKETS; i++)
Johannes Berg472dbc42008-09-11 00:01:49 +0200136 INIT_LIST_HEAD(&sdata->u.mesh.rmc->bucket[i].list);
Luis Carlos Cobo2e3c8732008-02-23 15:17:09 +0100137 return 0;
138}
139
Jasper Bryant-Greenef698d852008-08-03 12:04:37 +1200140void mesh_rmc_free(struct ieee80211_sub_if_data *sdata)
Luis Carlos Cobo2e3c8732008-02-23 15:17:09 +0100141{
Johannes Berg472dbc42008-09-11 00:01:49 +0200142 struct mesh_rmc *rmc = sdata->u.mesh.rmc;
Luis Carlos Cobo2e3c8732008-02-23 15:17:09 +0100143 struct rmc_entry *p, *n;
144 int i;
145
Johannes Berg472dbc42008-09-11 00:01:49 +0200146 if (!sdata->u.mesh.rmc)
Luis Carlos Cobo2e3c8732008-02-23 15:17:09 +0100147 return;
148
149 for (i = 0; i < RMC_BUCKETS; i++)
150 list_for_each_entry_safe(p, n, &rmc->bucket[i].list, list) {
151 list_del(&p->list);
152 kmem_cache_free(rm_cache, p);
153 }
154
155 kfree(rmc);
Johannes Berg472dbc42008-09-11 00:01:49 +0200156 sdata->u.mesh.rmc = NULL;
Luis Carlos Cobo2e3c8732008-02-23 15:17:09 +0100157}
158
159/**
160 * mesh_rmc_check - Check frame in recent multicast cache and add if absent.
161 *
162 * @sa: source address
163 * @mesh_hdr: mesh_header
164 *
165 * Returns: 0 if the frame is not in the cache, nonzero otherwise.
166 *
167 * Checks using the source address and the mesh sequence number if we have
168 * received this frame lately. If the frame is not in the cache, it is added to
169 * it.
170 */
171int mesh_rmc_check(u8 *sa, struct ieee80211s_hdr *mesh_hdr,
Jasper Bryant-Greenef698d852008-08-03 12:04:37 +1200172 struct ieee80211_sub_if_data *sdata)
Luis Carlos Cobo2e3c8732008-02-23 15:17:09 +0100173{
Johannes Berg472dbc42008-09-11 00:01:49 +0200174 struct mesh_rmc *rmc = sdata->u.mesh.rmc;
Luis Carlos Cobo2e3c8732008-02-23 15:17:09 +0100175 u32 seqnum = 0;
176 int entries = 0;
177 u8 idx;
178 struct rmc_entry *p, *n;
179
180 /* Don't care about endianness since only match matters */
Luis Carlos Cobo51cedda2008-04-23 12:15:29 -0700181 memcpy(&seqnum, &mesh_hdr->seqnum, sizeof(mesh_hdr->seqnum));
182 idx = le32_to_cpu(mesh_hdr->seqnum) & rmc->idx_mask;
Luis Carlos Cobo2e3c8732008-02-23 15:17:09 +0100183 list_for_each_entry_safe(p, n, &rmc->bucket[idx].list, list) {
184 ++entries;
185 if (time_after(jiffies, p->exp_time) ||
186 (entries == RMC_QUEUE_MAX_LEN)) {
187 list_del(&p->list);
188 kmem_cache_free(rm_cache, p);
189 --entries;
Joe Perchesf64f9e72009-11-29 16:55:45 -0800190 } else if ((seqnum == p->seqnum) &&
191 (memcmp(sa, p->sa, ETH_ALEN) == 0))
Luis Carlos Cobo2e3c8732008-02-23 15:17:09 +0100192 return -1;
193 }
194
195 p = kmem_cache_alloc(rm_cache, GFP_ATOMIC);
196 if (!p) {
197 printk(KERN_DEBUG "o11s: could not allocate RMC entry\n");
198 return 0;
199 }
200 p->seqnum = seqnum;
201 p->exp_time = jiffies + RMC_TIMEOUT;
202 memcpy(p->sa, sa, ETH_ALEN);
203 list_add(&p->list, &rmc->bucket[idx].list);
204 return 0;
205}
206
Jasper Bryant-Greenef698d852008-08-03 12:04:37 +1200207void mesh_mgmt_ies_add(struct sk_buff *skb, struct ieee80211_sub_if_data *sdata)
Luis Carlos Cobo2e3c8732008-02-23 15:17:09 +0100208{
Jasper Bryant-Greenef698d852008-08-03 12:04:37 +1200209 struct ieee80211_local *local = sdata->local;
Luis Carlos Cobo2e3c8732008-02-23 15:17:09 +0100210 struct ieee80211_supported_band *sband;
211 u8 *pos;
212 int len, i, rate;
Rui Paulo8f2fda92009-11-09 23:46:41 +0000213 u8 neighbors;
Luis Carlos Cobo2e3c8732008-02-23 15:17:09 +0100214
215 sband = local->hw.wiphy->bands[local->hw.conf.channel->band];
216 len = sband->n_bitrates;
217 if (len > 8)
218 len = 8;
219 pos = skb_put(skb, len + 2);
220 *pos++ = WLAN_EID_SUPP_RATES;
221 *pos++ = len;
222 for (i = 0; i < len; i++) {
223 rate = sband->bitrates[i].bitrate;
224 *pos++ = (u8) (rate / 5);
225 }
226
227 if (sband->n_bitrates > len) {
228 pos = skb_put(skb, sband->n_bitrates - len + 2);
229 *pos++ = WLAN_EID_EXT_SUPP_RATES;
230 *pos++ = sband->n_bitrates - len;
231 for (i = len; i < sband->n_bitrates; i++) {
232 rate = sband->bitrates[i].bitrate;
233 *pos++ = (u8) (rate / 5);
234 }
235 }
236
Rui Paulobe125c62009-11-09 23:46:54 +0000237 if (sband->band == IEEE80211_BAND_2GHZ) {
238 pos = skb_put(skb, 2 + 1);
239 *pos++ = WLAN_EID_DS_PARAMS;
240 *pos++ = 1;
241 *pos++ = ieee80211_frequency_to_channel(local->hw.conf.channel->center_freq);
242 }
243
Johannes Berg472dbc42008-09-11 00:01:49 +0200244 pos = skb_put(skb, 2 + sdata->u.mesh.mesh_id_len);
Luis Carlos Cobo2e3c8732008-02-23 15:17:09 +0100245 *pos++ = WLAN_EID_MESH_ID;
Johannes Berg472dbc42008-09-11 00:01:49 +0200246 *pos++ = sdata->u.mesh.mesh_id_len;
247 if (sdata->u.mesh.mesh_id_len)
248 memcpy(pos, sdata->u.mesh.mesh_id, sdata->u.mesh.mesh_id_len);
Luis Carlos Cobo2e3c8732008-02-23 15:17:09 +0100249
Rui Paulo136cfa22009-11-18 18:40:00 +0000250 pos = skb_put(skb, 2 + sizeof(struct ieee80211_meshconf_ie));
Luis Carlos Cobo2e3c8732008-02-23 15:17:09 +0100251 *pos++ = WLAN_EID_MESH_CONFIG;
Rui Paulo136cfa22009-11-18 18:40:00 +0000252 *pos++ = sizeof(struct ieee80211_meshconf_ie);
Luis Carlos Cobo2e3c8732008-02-23 15:17:09 +0100253
254 /* Active path selection protocol ID */
Rui Paulo34917072009-11-09 23:46:39 +0000255 *pos++ = sdata->u.mesh.mesh_pp_id;
Luis Carlos Cobo2e3c8732008-02-23 15:17:09 +0100256
257 /* Active path selection metric ID */
Rui Paulo34917072009-11-09 23:46:39 +0000258 *pos++ = sdata->u.mesh.mesh_pm_id;
Luis Carlos Cobo2e3c8732008-02-23 15:17:09 +0100259
260 /* Congestion control mode identifier */
Rui Paulo34917072009-11-09 23:46:39 +0000261 *pos++ = sdata->u.mesh.mesh_cc_id;
Luis Carlos Cobo2e3c8732008-02-23 15:17:09 +0100262
Javier Cardona9e03fdf2009-08-20 09:21:45 -0700263 /* Synchronization protocol identifier */
Rui Paulo34917072009-11-09 23:46:39 +0000264 *pos++ = sdata->u.mesh.mesh_sp_id;
Luis Carlos Cobo2e3c8732008-02-23 15:17:09 +0100265
Javier Cardona9e03fdf2009-08-20 09:21:45 -0700266 /* Authentication Protocol identifier */
Rui Paulo34917072009-11-09 23:46:39 +0000267 *pos++ = sdata->u.mesh.mesh_auth_id;
Javier Cardona9e03fdf2009-08-20 09:21:45 -0700268
Rui Paulo8f2fda92009-11-09 23:46:41 +0000269 /* Mesh Formation Info - number of neighbors */
270 neighbors = atomic_read(&sdata->u.mesh.mshstats.estab_plinks);
271 /* Number of neighbor mesh STAs or 15 whichever is smaller */
272 neighbors = (neighbors > 15) ? 15 : neighbors;
273 *pos++ = neighbors << 1;
Javier Cardona9e03fdf2009-08-20 09:21:45 -0700274
Luis Carlos Cobo2e3c8732008-02-23 15:17:09 +0100275 /* Mesh capability */
Johannes Berg472dbc42008-09-11 00:01:49 +0200276 sdata->u.mesh.accepting_plinks = mesh_plink_availables(sdata);
Rui Paulo34917072009-11-09 23:46:39 +0000277 *pos = MESHCONF_CAPAB_FORWARDING;
278 *pos++ |= sdata->u.mesh.accepting_plinks ?
279 MESHCONF_CAPAB_ACCEPT_PLINKS : 0x00;
Luis Carlos Cobo2e3c8732008-02-23 15:17:09 +0100280 *pos++ = 0x00;
Javier Cardonac80d5452010-12-16 17:37:49 -0800281
282 if (sdata->u.mesh.vendor_ie) {
283 int len = sdata->u.mesh.vendor_ie_len;
284 const u8 *data = sdata->u.mesh.vendor_ie;
285 if (skb_tailroom(skb) > len)
286 memcpy(skb_put(skb, len), data, len);
287 }
Luis Carlos Cobo2e3c8732008-02-23 15:17:09 +0100288}
289
Jasper Bryant-Greenef698d852008-08-03 12:04:37 +1200290u32 mesh_table_hash(u8 *addr, struct ieee80211_sub_if_data *sdata, struct mesh_table *tbl)
Luis Carlos Cobo2e3c8732008-02-23 15:17:09 +0100291{
292 /* Use last four bytes of hw addr and interface index as hash index */
Jasper Bryant-Greenef698d852008-08-03 12:04:37 +1200293 return jhash_2words(*(u32 *)(addr+2), sdata->dev->ifindex, tbl->hash_rnd)
Luis Carlos Cobo2e3c8732008-02-23 15:17:09 +0100294 & tbl->hash_mask;
295}
296
Luis Carlos Cobo2e3c8732008-02-23 15:17:09 +0100297struct mesh_table *mesh_table_alloc(int size_order)
298{
299 int i;
300 struct mesh_table *newtbl;
301
302 newtbl = kmalloc(sizeof(struct mesh_table), GFP_KERNEL);
303 if (!newtbl)
304 return NULL;
305
306 newtbl->hash_buckets = kzalloc(sizeof(struct hlist_head) *
307 (1 << size_order), GFP_KERNEL);
308
309 if (!newtbl->hash_buckets) {
310 kfree(newtbl);
311 return NULL;
312 }
313
314 newtbl->hashwlock = kmalloc(sizeof(spinlock_t) *
315 (1 << size_order), GFP_KERNEL);
316 if (!newtbl->hashwlock) {
317 kfree(newtbl->hash_buckets);
318 kfree(newtbl);
319 return NULL;
320 }
321
322 newtbl->size_order = size_order;
323 newtbl->hash_mask = (1 << size_order) - 1;
324 atomic_set(&newtbl->entries, 0);
325 get_random_bytes(&newtbl->hash_rnd,
326 sizeof(newtbl->hash_rnd));
327 for (i = 0; i <= newtbl->hash_mask; i++)
328 spin_lock_init(&newtbl->hashwlock[i]);
329
330 return newtbl;
331}
332
Luis Carlos Cobo2e3c8732008-02-23 15:17:09 +0100333
334static void ieee80211_mesh_path_timer(unsigned long data)
335{
336 struct ieee80211_sub_if_data *sdata =
337 (struct ieee80211_sub_if_data *) data;
Johannes Berg472dbc42008-09-11 00:01:49 +0200338 struct ieee80211_if_mesh *ifmsh = &sdata->u.mesh;
Johannes Berg133b8222008-09-16 14:18:59 +0200339 struct ieee80211_local *local = sdata->local;
Luis Carlos Cobo2e3c8732008-02-23 15:17:09 +0100340
Johannes Berg5bb644a2009-05-17 11:40:42 +0200341 if (local->quiescing) {
342 set_bit(TMR_RUNNING_MP, &ifmsh->timers_running);
343 return;
344 }
345
Johannes Berg64592c82010-06-10 10:21:31 +0200346 ieee80211_queue_work(&local->hw, &sdata->work);
Luis Carlos Cobo2e3c8732008-02-23 15:17:09 +0100347}
348
Rui Pauloe304bfd2009-11-09 23:46:56 +0000349static void ieee80211_mesh_path_root_timer(unsigned long data)
350{
351 struct ieee80211_sub_if_data *sdata =
352 (struct ieee80211_sub_if_data *) data;
353 struct ieee80211_if_mesh *ifmsh = &sdata->u.mesh;
354 struct ieee80211_local *local = sdata->local;
355
356 set_bit(MESH_WORK_ROOT, &ifmsh->wrkq_flags);
357
358 if (local->quiescing) {
359 set_bit(TMR_RUNNING_MPR, &ifmsh->timers_running);
360 return;
361 }
362
Johannes Berg64592c82010-06-10 10:21:31 +0200363 ieee80211_queue_work(&local->hw, &sdata->work);
Rui Pauloe304bfd2009-11-09 23:46:56 +0000364}
365
Rui Paulo63c57232009-11-09 23:46:57 +0000366void ieee80211_mesh_root_setup(struct ieee80211_if_mesh *ifmsh)
367{
368 if (ifmsh->mshcfg.dot11MeshHWMPRootMode)
369 set_bit(MESH_WORK_ROOT, &ifmsh->wrkq_flags);
370 else {
371 clear_bit(MESH_WORK_ROOT, &ifmsh->wrkq_flags);
372 /* stop running timer */
373 del_timer_sync(&ifmsh->mesh_path_root_timer);
374 }
375}
376
Johannes Berg902acc72008-02-23 15:17:19 +0100377/**
Javier Cardona3c5772a2009-08-10 12:15:48 -0700378 * ieee80211_fill_mesh_addresses - fill addresses of a locally originated mesh frame
379 * @hdr: 802.11 frame header
380 * @fc: frame control field
381 * @meshda: destination address in the mesh
382 * @meshsa: source address address in the mesh. Same as TA, as frame is
383 * locally originated.
384 *
385 * Return the length of the 802.11 (does not include a mesh control header)
386 */
Johannes Berg15ff6362009-11-17 13:34:04 +0100387int ieee80211_fill_mesh_addresses(struct ieee80211_hdr *hdr, __le16 *fc,
388 const u8 *meshda, const u8 *meshsa)
389{
Javier Cardona3c5772a2009-08-10 12:15:48 -0700390 if (is_multicast_ether_addr(meshda)) {
391 *fc |= cpu_to_le16(IEEE80211_FCTL_FROMDS);
392 /* DA TA SA */
393 memcpy(hdr->addr1, meshda, ETH_ALEN);
394 memcpy(hdr->addr2, meshsa, ETH_ALEN);
395 memcpy(hdr->addr3, meshsa, ETH_ALEN);
396 return 24;
397 } else {
398 *fc |= cpu_to_le16(IEEE80211_FCTL_FROMDS |
399 IEEE80211_FCTL_TODS);
400 /* RA TA DA SA */
401 memset(hdr->addr1, 0, ETH_ALEN); /* RA is resolved later */
402 memcpy(hdr->addr2, meshsa, ETH_ALEN);
403 memcpy(hdr->addr3, meshda, ETH_ALEN);
404 memcpy(hdr->addr4, meshsa, ETH_ALEN);
405 return 30;
406 }
407}
408
409/**
Johannes Berg902acc72008-02-23 15:17:19 +0100410 * ieee80211_new_mesh_header - create a new mesh header
411 * @meshhdr: uninitialized mesh header
412 * @sdata: mesh interface to be used
Javier Cardona61ad5392010-12-16 17:23:34 -0800413 * @addr4or5: 1st address in the ae header, which may correspond to address 4
414 * (if addr6 is NULL) or address 5 (if addr6 is present). It may
415 * be NULL.
416 * @addr6: 2nd address in the ae header, which corresponds to addr6 of the
417 * mesh frame
Johannes Berg902acc72008-02-23 15:17:19 +0100418 *
419 * Return the header length.
420 */
421int ieee80211_new_mesh_header(struct ieee80211s_hdr *meshhdr,
Javier Cardona61ad5392010-12-16 17:23:34 -0800422 struct ieee80211_sub_if_data *sdata, char *addr4or5,
423 char *addr6)
Johannes Berg902acc72008-02-23 15:17:19 +0100424{
Javier Cardona3c5772a2009-08-10 12:15:48 -0700425 int aelen = 0;
Javier Cardona61ad5392010-12-16 17:23:34 -0800426 BUG_ON(!addr4or5 && addr6);
Julia Lawall0c3cee72009-12-09 20:25:59 +0100427 memset(meshhdr, 0, sizeof(*meshhdr));
Johannes Berg472dbc42008-09-11 00:01:49 +0200428 meshhdr->ttl = sdata->u.mesh.mshcfg.dot11MeshTTL;
429 put_unaligned(cpu_to_le32(sdata->u.mesh.mesh_seqnum), &meshhdr->seqnum);
430 sdata->u.mesh.mesh_seqnum++;
Javier Cardona61ad5392010-12-16 17:23:34 -0800431 if (addr4or5 && !addr6) {
Javier Cardona3c5772a2009-08-10 12:15:48 -0700432 meshhdr->flags |= MESH_FLAGS_AE_A4;
433 aelen += ETH_ALEN;
Javier Cardona61ad5392010-12-16 17:23:34 -0800434 memcpy(meshhdr->eaddr1, addr4or5, ETH_ALEN);
435 } else if (addr4or5 && addr6) {
Javier Cardona3c5772a2009-08-10 12:15:48 -0700436 meshhdr->flags |= MESH_FLAGS_AE_A5_A6;
437 aelen += 2 * ETH_ALEN;
Javier Cardona61ad5392010-12-16 17:23:34 -0800438 memcpy(meshhdr->eaddr1, addr4or5, ETH_ALEN);
439 memcpy(meshhdr->eaddr2, addr6, ETH_ALEN);
Javier Cardona3c5772a2009-08-10 12:15:48 -0700440 }
441 return 6 + aelen;
Johannes Berg902acc72008-02-23 15:17:19 +0100442}
443
Johannes Berg472dbc42008-09-11 00:01:49 +0200444static void ieee80211_mesh_housekeeping(struct ieee80211_sub_if_data *sdata,
445 struct ieee80211_if_mesh *ifmsh)
446{
447 bool free_plinks;
448
449#ifdef CONFIG_MAC80211_VERBOSE_DEBUG
450 printk(KERN_DEBUG "%s: running mesh housekeeping\n",
Johannes Berg47846c92009-11-25 17:46:19 +0100451 sdata->name);
Johannes Berg472dbc42008-09-11 00:01:49 +0200452#endif
453
454 ieee80211_sta_expire(sdata, IEEE80211_MESH_PEER_INACTIVITY_LIMIT);
455 mesh_path_expire(sdata);
456
457 free_plinks = mesh_plink_availables(sdata);
458 if (free_plinks != sdata->u.mesh.accepting_plinks)
Johannes Berg2d0ddec2009-04-23 16:13:26 +0200459 ieee80211_bss_info_change_notify(sdata, BSS_CHANGED_BEACON);
Johannes Berg472dbc42008-09-11 00:01:49 +0200460
Johannes Berg472dbc42008-09-11 00:01:49 +0200461 mod_timer(&ifmsh->housekeeping_timer,
462 round_jiffies(jiffies + IEEE80211_MESH_HOUSEKEEPING_INTERVAL));
463}
464
Rui Pauloe304bfd2009-11-09 23:46:56 +0000465static void ieee80211_mesh_rootpath(struct ieee80211_sub_if_data *sdata)
466{
467 struct ieee80211_if_mesh *ifmsh = &sdata->u.mesh;
468
469 mesh_path_tx_root_frame(sdata);
470 mod_timer(&ifmsh->mesh_path_root_timer,
471 round_jiffies(jiffies + IEEE80211_MESH_RANN_INTERVAL));
472}
473
Johannes Berg5bb644a2009-05-17 11:40:42 +0200474#ifdef CONFIG_PM
475void ieee80211_mesh_quiesce(struct ieee80211_sub_if_data *sdata)
476{
477 struct ieee80211_if_mesh *ifmsh = &sdata->u.mesh;
478
Johannes Berg5bb644a2009-05-17 11:40:42 +0200479 /* use atomic bitops in case both timers fire at the same time */
480
481 if (del_timer_sync(&ifmsh->housekeeping_timer))
482 set_bit(TMR_RUNNING_HK, &ifmsh->timers_running);
483 if (del_timer_sync(&ifmsh->mesh_path_timer))
484 set_bit(TMR_RUNNING_MP, &ifmsh->timers_running);
Rui Pauloe304bfd2009-11-09 23:46:56 +0000485 if (del_timer_sync(&ifmsh->mesh_path_root_timer))
486 set_bit(TMR_RUNNING_MPR, &ifmsh->timers_running);
Johannes Berg5bb644a2009-05-17 11:40:42 +0200487}
488
489void ieee80211_mesh_restart(struct ieee80211_sub_if_data *sdata)
490{
491 struct ieee80211_if_mesh *ifmsh = &sdata->u.mesh;
492
493 if (test_and_clear_bit(TMR_RUNNING_HK, &ifmsh->timers_running))
494 add_timer(&ifmsh->housekeeping_timer);
495 if (test_and_clear_bit(TMR_RUNNING_MP, &ifmsh->timers_running))
496 add_timer(&ifmsh->mesh_path_timer);
Rui Pauloe304bfd2009-11-09 23:46:56 +0000497 if (test_and_clear_bit(TMR_RUNNING_MPR, &ifmsh->timers_running))
498 add_timer(&ifmsh->mesh_path_root_timer);
Rui Paulo63c57232009-11-09 23:46:57 +0000499 ieee80211_mesh_root_setup(ifmsh);
Johannes Berg5bb644a2009-05-17 11:40:42 +0200500}
501#endif
Johannes Berg472dbc42008-09-11 00:01:49 +0200502
503void ieee80211_start_mesh(struct ieee80211_sub_if_data *sdata)
504{
505 struct ieee80211_if_mesh *ifmsh = &sdata->u.mesh;
506 struct ieee80211_local *local = sdata->local;
507
Johannes Berg09b17472010-12-03 09:20:41 +0100508 local->fif_other_bss++;
509 /* mesh ifaces must set allmulti to forward mcast traffic */
510 atomic_inc(&local->iff_allmultis);
511 ieee80211_configure_filter(local);
512
Javier Cardonac7108a72010-12-16 17:37:50 -0800513 ifmsh->mesh_cc_id = 0; /* Disabled */
514 ifmsh->mesh_sp_id = 0; /* Neighbor Offset */
515 ifmsh->mesh_auth_id = 0; /* Disabled */
Rui Paulo6b9ac442009-10-20 21:21:48 +0100516 set_bit(MESH_WORK_HOUSEKEEPING, &ifmsh->wrkq_flags);
Rui Paulo63c57232009-11-09 23:46:57 +0000517 ieee80211_mesh_root_setup(ifmsh);
Johannes Berg64592c82010-06-10 10:21:31 +0200518 ieee80211_queue_work(&local->hw, &sdata->work);
Javier Cardona5b365832009-08-10 12:15:51 -0700519 sdata->vif.bss_conf.beacon_int = MESH_DEFAULT_BEACON_INTERVAL;
Johannes Berg2d0ddec2009-04-23 16:13:26 +0200520 ieee80211_bss_info_change_notify(sdata, BSS_CHANGED_BEACON |
Javier Cardona5b365832009-08-10 12:15:51 -0700521 BSS_CHANGED_BEACON_ENABLED |
522 BSS_CHANGED_BEACON_INT);
Johannes Berg472dbc42008-09-11 00:01:49 +0200523}
524
525void ieee80211_stop_mesh(struct ieee80211_sub_if_data *sdata)
526{
Johannes Berg09b17472010-12-03 09:20:41 +0100527 struct ieee80211_local *local = sdata->local;
Johannes Berg29cbe682010-12-03 09:20:44 +0100528 struct ieee80211_if_mesh *ifmsh = &sdata->u.mesh;
529
530 ifmsh->mesh_id_len = 0;
531 ieee80211_bss_info_change_notify(sdata, BSS_CHANGED_BEACON_ENABLED);
532 sta_info_flush(local, NULL);
Johannes Berg09b17472010-12-03 09:20:41 +0100533
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)
Bruno Randolf59eb21a2011-01-17 13:37:28 +0900577 freq = ieee80211_channel_to_frequency(elems.ds_params[0], band);
Johannes Berg472dbc42008-09-11 00:01:49 +0200578 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
Nick Ledovskikhdcac9082011-01-11 14:35:12 +0000648 if (test_and_clear_bit(MESH_WORK_GROW_MPP_TABLE, &ifmsh->wrkq_flags))
Javier Cardona18889232009-08-10 12:15:52 -0700649 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
Johannes Berg472dbc42008-09-11 00:01:49 +0200677 ifmsh->accepting_plinks = true;
678 ifmsh->preq_id = 0;
Rui Paulod19b3bf2009-11-09 23:46:55 +0000679 ifmsh->sn = 0;
Johannes Berg472dbc42008-09-11 00:01:49 +0200680 atomic_set(&ifmsh->mpaths, 0);
Jasper Bryant-Greenef698d852008-08-03 12:04:37 +1200681 mesh_rmc_init(sdata);
Johannes Berg472dbc42008-09-11 00:01:49 +0200682 ifmsh->last_preq = jiffies;
Johannes Berg902acc72008-02-23 15:17:19 +0100683 /* Allocate all mesh structures when creating the first mesh interface. */
684 if (!mesh_allocated)
685 ieee80211s_init();
Johannes Berg472dbc42008-09-11 00:01:49 +0200686 setup_timer(&ifmsh->mesh_path_timer,
Johannes Berg902acc72008-02-23 15:17:19 +0100687 ieee80211_mesh_path_timer,
688 (unsigned long) sdata);
Rui Pauloe304bfd2009-11-09 23:46:56 +0000689 setup_timer(&ifmsh->mesh_path_root_timer,
690 ieee80211_mesh_path_root_timer,
691 (unsigned long) sdata);
Johannes Berg472dbc42008-09-11 00:01:49 +0200692 INIT_LIST_HEAD(&ifmsh->preq_queue.list);
693 spin_lock_init(&ifmsh->mesh_preq_queue_lock);
694}