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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"
Chun-Yeow Yeohb8456a12013-10-17 15:55:02 -070015#include "driver-ops.h"
Luis Carlos Cobo2e3c8732008-02-23 15:17:09 +010016
Johannes Bergbf7cd942013-02-15 14:40:31 +010017static int mesh_allocated;
Luis Carlos Cobo2e3c8732008-02-23 15:17:09 +010018static struct kmem_cache *rm_cache;
19
Thomas Pedersen25d49e42011-08-11 19:35:15 -070020bool mesh_action_is_path_sel(struct ieee80211_mgmt *mgmt)
21{
22 return (mgmt->u.action.u.mesh_action.action_code ==
23 WLAN_MESH_ACTION_HWMP_PATH_SELECTION);
24}
Thomas Pedersen25d49e42011-08-11 19:35:15 -070025
Luis Carlos Cobo2e3c8732008-02-23 15:17:09 +010026void ieee80211s_init(void)
27{
28 mesh_pathtbl_init();
29 mesh_allocated = 1;
30 rm_cache = kmem_cache_create("mesh_rmc", sizeof(struct rmc_entry),
31 0, 0, NULL);
32}
33
34void ieee80211s_stop(void)
35{
Johannes Bergbf7cd942013-02-15 14:40:31 +010036 if (!mesh_allocated)
37 return;
Luis Carlos Cobo2e3c8732008-02-23 15:17:09 +010038 mesh_pathtbl_unregister();
39 kmem_cache_destroy(rm_cache);
40}
41
Johannes Berg472dbc42008-09-11 00:01:49 +020042static void ieee80211_mesh_housekeeping_timer(unsigned long data)
43{
44 struct ieee80211_sub_if_data *sdata = (void *) data;
45 struct ieee80211_local *local = sdata->local;
46 struct ieee80211_if_mesh *ifmsh = &sdata->u.mesh;
47
Rui Paulo6b9ac442009-10-20 21:21:48 +010048 set_bit(MESH_WORK_HOUSEKEEPING, &ifmsh->wrkq_flags);
Johannes Berg5bb644a2009-05-17 11:40:42 +020049
Johannes Berg64592c82010-06-10 10:21:31 +020050 ieee80211_queue_work(&local->hw, &sdata->work);
Johannes Berg472dbc42008-09-11 00:01:49 +020051}
52
Luis Carlos Cobo2e3c8732008-02-23 15:17:09 +010053/**
54 * mesh_matches_local - check if the config of a mesh point matches ours
55 *
Jasper Bryant-Greenef698d852008-08-03 12:04:37 +120056 * @sdata: local mesh subif
Thomas Pedersenf743ff42012-04-18 19:23:43 -070057 * @ie: information elements of a management frame from the mesh peer
Luis Carlos Cobo2e3c8732008-02-23 15:17:09 +010058 *
59 * This function checks if the mesh configuration of a mesh point matches the
60 * local mesh configuration, i.e. if both nodes belong to the same mesh network.
61 */
Thomas Pedersenf743ff42012-04-18 19:23:43 -070062bool mesh_matches_local(struct ieee80211_sub_if_data *sdata,
63 struct ieee802_11_elems *ie)
Luis Carlos Cobo2e3c8732008-02-23 15:17:09 +010064{
Johannes Berg472dbc42008-09-11 00:01:49 +020065 struct ieee80211_if_mesh *ifmsh = &sdata->u.mesh;
Thomas Pedersenf743ff42012-04-18 19:23:43 -070066 u32 basic_rates = 0;
Johannes Berg4bf88532012-11-09 11:39:59 +010067 struct cfg80211_chan_def sta_chan_def;
Luis Carlos Cobo2e3c8732008-02-23 15:17:09 +010068
Luis Carlos Cobo2e3c8732008-02-23 15:17:09 +010069 /*
70 * As support for each feature is added, check for matching
71 * - On mesh config capabilities
72 * - Power Save Support En
73 * - Sync support enabled
74 * - Sync support active
75 * - Sync support required from peer
76 * - MDA enabled
77 * - Power management control on fc
78 */
Thomas Pedersen739522b2011-10-26 14:47:28 -070079 if (!(ifmsh->mesh_id_len == ie->mesh_id_len &&
80 memcmp(ifmsh->mesh_id, ie->mesh_id, ie->mesh_id_len) == 0 &&
81 (ifmsh->mesh_pp_id == ie->mesh_config->meshconf_psel) &&
82 (ifmsh->mesh_pm_id == ie->mesh_config->meshconf_pmetric) &&
83 (ifmsh->mesh_cc_id == ie->mesh_config->meshconf_congest) &&
84 (ifmsh->mesh_sp_id == ie->mesh_config->meshconf_synch) &&
85 (ifmsh->mesh_auth_id == ie->mesh_config->meshconf_auth)))
Johannes Bergbf7cd942013-02-15 14:40:31 +010086 return false;
Luis Carlos Cobo2e3c8732008-02-23 15:17:09 +010087
Simon Wunderlich2103dec2013-07-08 16:55:53 +020088 ieee80211_sta_get_rates(sdata, ie, ieee80211_get_sdata_band(sdata),
Thomas Pedersenf743ff42012-04-18 19:23:43 -070089 &basic_rates);
90
Ashok Nagarajanfe40cb62012-04-02 21:21:22 -070091 if (sdata->vif.bss_conf.basic_rates != basic_rates)
Johannes Bergbf7cd942013-02-15 14:40:31 +010092 return false;
Ashok Nagarajanfe40cb62012-04-02 21:21:22 -070093
Johannes Berg4bf88532012-11-09 11:39:59 +010094 ieee80211_ht_oper_to_chandef(sdata->vif.bss_conf.chandef.chan,
95 ie->ht_operation, &sta_chan_def);
Ashok Nagarajanb91e64a2012-04-30 14:20:31 -070096
Bob Copelandc85fb532015-08-27 09:00:18 -040097 ieee80211_vht_oper_to_chandef(sdata->vif.bss_conf.chandef.chan,
98 ie->vht_operation, &sta_chan_def);
99
Johannes Berg4bf88532012-11-09 11:39:59 +0100100 if (!cfg80211_chandef_compatible(&sdata->vif.bss_conf.chandef,
101 &sta_chan_def))
Johannes Bergbf7cd942013-02-15 14:40:31 +0100102 return false;
Thomas Pedersen739522b2011-10-26 14:47:28 -0700103
104 return true;
Luis Carlos Cobo2e3c8732008-02-23 15:17:09 +0100105}
106
107/**
108 * mesh_peer_accepts_plinks - check if an mp is willing to establish peer links
109 *
110 * @ie: information elements of a management frame from the mesh peer
Luis Carlos Cobo2e3c8732008-02-23 15:17:09 +0100111 */
Jasper Bryant-Greenef698d852008-08-03 12:04:37 +1200112bool mesh_peer_accepts_plinks(struct ieee802_11_elems *ie)
Luis Carlos Cobo2e3c8732008-02-23 15:17:09 +0100113{
Rui Paulo136cfa22009-11-18 18:40:00 +0000114 return (ie->mesh_config->meshconf_cap &
Johannes Bergbf7cd942013-02-15 14:40:31 +0100115 IEEE80211_MESHCONF_CAPAB_ACCEPT_PLINKS) != 0;
Luis Carlos Cobo2e3c8732008-02-23 15:17:09 +0100116}
117
118/**
Ben Hutchings2c530402012-07-10 10:55:09 +0000119 * mesh_accept_plinks_update - update accepting_plink in local mesh beacons
Luis Carlos Cobo2e3c8732008-02-23 15:17:09 +0100120 *
Johannes Bergd0709a62008-02-25 16:27:46 +0100121 * @sdata: mesh interface in which mesh beacons are going to be updated
Marco Porschdf323812012-08-08 07:58:43 +0200122 *
123 * Returns: beacon changed flag if the beacon content changed.
Luis Carlos Cobo2e3c8732008-02-23 15:17:09 +0100124 */
Marco Porschdf323812012-08-08 07:58:43 +0200125u32 mesh_accept_plinks_update(struct ieee80211_sub_if_data *sdata)
Luis Carlos Cobo2e3c8732008-02-23 15:17:09 +0100126{
Luis Carlos Cobo2e3c8732008-02-23 15:17:09 +0100127 bool free_plinks;
Marco Porschdf323812012-08-08 07:58:43 +0200128 u32 changed = 0;
Luis Carlos Cobo2e3c8732008-02-23 15:17:09 +0100129
130 /* In case mesh_plink_free_count > 0 and mesh_plinktbl_capacity == 0,
131 * the mesh interface might be able to establish plinks with peers that
Luis Carlos Cobob4e08ea2008-02-29 15:46:08 -0800132 * are already on the table but are not on PLINK_ESTAB state. However,
133 * in general the mesh interface is not accepting peer link requests
134 * from new peers, and that must be reflected in the beacon
Luis Carlos Cobo2e3c8732008-02-23 15:17:09 +0100135 */
136 free_plinks = mesh_plink_availables(sdata);
137
Marco Porschdf323812012-08-08 07:58:43 +0200138 if (free_plinks != sdata->u.mesh.accepting_plinks) {
139 sdata->u.mesh.accepting_plinks = free_plinks;
140 changed = BSS_CHANGED_BEACON;
141 }
142
143 return changed;
Luis Carlos Cobo2e3c8732008-02-23 15:17:09 +0100144}
145
Thomas Pedersen45b50282013-02-06 10:17:21 -0800146/*
147 * mesh_sta_cleanup - clean up any mesh sta state
148 *
149 * @sta: mesh sta to clean up.
150 */
151void mesh_sta_cleanup(struct sta_info *sta)
152{
153 struct ieee80211_sub_if_data *sdata = sta->sdata;
154 u32 changed;
155
156 /*
157 * maybe userspace handles peer allocation and peering, but in either
158 * case the beacon is still generated by the kernel and we might need
159 * an update.
160 */
161 changed = mesh_accept_plinks_update(sdata);
Thomas Pedersena6dad6a2013-03-04 13:06:12 -0800162 if (!sdata->u.mesh.user_mpm) {
Thomas Pedersen45b50282013-02-06 10:17:21 -0800163 changed |= mesh_plink_deactivate(sta);
Johannes Berg433f5bc2015-06-17 10:31:00 +0200164 del_timer_sync(&sta->mesh->plink_timer);
Thomas Pedersen45b50282013-02-06 10:17:21 -0800165 }
166
Thomas Pedersenf81a9de2013-06-13 15:54:41 -0700167 if (changed)
Thomas Pedersen2b5e1962013-02-14 11:20:13 -0800168 ieee80211_mbss_info_change_notify(sdata, changed);
Thomas Pedersen45b50282013-02-06 10:17:21 -0800169}
170
Jasper Bryant-Greenef698d852008-08-03 12:04:37 +1200171int mesh_rmc_init(struct ieee80211_sub_if_data *sdata)
Luis Carlos Cobo2e3c8732008-02-23 15:17:09 +0100172{
Luis Carlos Cobo2e3c8732008-02-23 15:17:09 +0100173 int i;
174
Johannes Berg472dbc42008-09-11 00:01:49 +0200175 sdata->u.mesh.rmc = kmalloc(sizeof(struct mesh_rmc), GFP_KERNEL);
176 if (!sdata->u.mesh.rmc)
Luis Carlos Cobo2e3c8732008-02-23 15:17:09 +0100177 return -ENOMEM;
Johannes Berg472dbc42008-09-11 00:01:49 +0200178 sdata->u.mesh.rmc->idx_mask = RMC_BUCKETS - 1;
Luis Carlos Cobo2e3c8732008-02-23 15:17:09 +0100179 for (i = 0; i < RMC_BUCKETS; i++)
Thomas Pedersenb7cfcd12012-12-17 18:41:57 -0800180 INIT_LIST_HEAD(&sdata->u.mesh.rmc->bucket[i]);
Luis Carlos Cobo2e3c8732008-02-23 15:17:09 +0100181 return 0;
182}
183
Jasper Bryant-Greenef698d852008-08-03 12:04:37 +1200184void mesh_rmc_free(struct ieee80211_sub_if_data *sdata)
Luis Carlos Cobo2e3c8732008-02-23 15:17:09 +0100185{
Johannes Berg472dbc42008-09-11 00:01:49 +0200186 struct mesh_rmc *rmc = sdata->u.mesh.rmc;
Luis Carlos Cobo2e3c8732008-02-23 15:17:09 +0100187 struct rmc_entry *p, *n;
188 int i;
189
Johannes Berg472dbc42008-09-11 00:01:49 +0200190 if (!sdata->u.mesh.rmc)
Luis Carlos Cobo2e3c8732008-02-23 15:17:09 +0100191 return;
192
Johannes Bergbf7cd942013-02-15 14:40:31 +0100193 for (i = 0; i < RMC_BUCKETS; i++) {
Thomas Pedersenb7cfcd12012-12-17 18:41:57 -0800194 list_for_each_entry_safe(p, n, &rmc->bucket[i], list) {
Luis Carlos Cobo2e3c8732008-02-23 15:17:09 +0100195 list_del(&p->list);
196 kmem_cache_free(rm_cache, p);
197 }
Johannes Bergbf7cd942013-02-15 14:40:31 +0100198 }
Luis Carlos Cobo2e3c8732008-02-23 15:17:09 +0100199
200 kfree(rmc);
Johannes Berg472dbc42008-09-11 00:01:49 +0200201 sdata->u.mesh.rmc = NULL;
Luis Carlos Cobo2e3c8732008-02-23 15:17:09 +0100202}
203
204/**
205 * mesh_rmc_check - Check frame in recent multicast cache and add if absent.
206 *
Johannes Bergbf7cd942013-02-15 14:40:31 +0100207 * @sdata: interface
Luis Carlos Cobo2e3c8732008-02-23 15:17:09 +0100208 * @sa: source address
209 * @mesh_hdr: mesh_header
210 *
211 * Returns: 0 if the frame is not in the cache, nonzero otherwise.
212 *
213 * Checks using the source address and the mesh sequence number if we have
214 * received this frame lately. If the frame is not in the cache, it is added to
215 * it.
216 */
Johannes Bergbf7cd942013-02-15 14:40:31 +0100217int mesh_rmc_check(struct ieee80211_sub_if_data *sdata,
218 const u8 *sa, struct ieee80211s_hdr *mesh_hdr)
Luis Carlos Cobo2e3c8732008-02-23 15:17:09 +0100219{
Johannes Berg472dbc42008-09-11 00:01:49 +0200220 struct mesh_rmc *rmc = sdata->u.mesh.rmc;
Luis Carlos Cobo2e3c8732008-02-23 15:17:09 +0100221 u32 seqnum = 0;
222 int entries = 0;
223 u8 idx;
224 struct rmc_entry *p, *n;
225
226 /* Don't care about endianness since only match matters */
Luis Carlos Cobo51cedda2008-04-23 12:15:29 -0700227 memcpy(&seqnum, &mesh_hdr->seqnum, sizeof(mesh_hdr->seqnum));
228 idx = le32_to_cpu(mesh_hdr->seqnum) & rmc->idx_mask;
Thomas Pedersenb7cfcd12012-12-17 18:41:57 -0800229 list_for_each_entry_safe(p, n, &rmc->bucket[idx], list) {
Luis Carlos Cobo2e3c8732008-02-23 15:17:09 +0100230 ++entries;
231 if (time_after(jiffies, p->exp_time) ||
Johannes Bergbf7cd942013-02-15 14:40:31 +0100232 entries == RMC_QUEUE_MAX_LEN) {
Luis Carlos Cobo2e3c8732008-02-23 15:17:09 +0100233 list_del(&p->list);
234 kmem_cache_free(rm_cache, p);
235 --entries;
Johannes Bergbf7cd942013-02-15 14:40:31 +0100236 } else if ((seqnum == p->seqnum) && ether_addr_equal(sa, p->sa))
Luis Carlos Cobo2e3c8732008-02-23 15:17:09 +0100237 return -1;
238 }
239
240 p = kmem_cache_alloc(rm_cache, GFP_ATOMIC);
Joe Perchesd15b8452011-08-29 14:17:31 -0700241 if (!p)
Luis Carlos Cobo2e3c8732008-02-23 15:17:09 +0100242 return 0;
Joe Perchesd15b8452011-08-29 14:17:31 -0700243
Luis Carlos Cobo2e3c8732008-02-23 15:17:09 +0100244 p->seqnum = seqnum;
245 p->exp_time = jiffies + RMC_TIMEOUT;
246 memcpy(p->sa, sa, ETH_ALEN);
Thomas Pedersenb7cfcd12012-12-17 18:41:57 -0800247 list_add(&p->list, &rmc->bucket[idx]);
Luis Carlos Cobo2e3c8732008-02-23 15:17:09 +0100248 return 0;
249}
250
Johannes Bergbf7cd942013-02-15 14:40:31 +0100251int mesh_add_meshconf_ie(struct ieee80211_sub_if_data *sdata,
252 struct sk_buff *skb)
Thomas Pedersen082ebb02011-08-11 19:35:10 -0700253{
254 struct ieee80211_if_mesh *ifmsh = &sdata->u.mesh;
255 u8 *pos, neighbors;
256 u8 meshconf_len = sizeof(struct ieee80211_meshconf_ie);
257
258 if (skb_tailroom(skb) < 2 + meshconf_len)
259 return -ENOMEM;
260
261 pos = skb_put(skb, 2 + meshconf_len);
262 *pos++ = WLAN_EID_MESH_CONFIG;
263 *pos++ = meshconf_len;
264
Thomas Pedersen43552be2013-12-15 13:14:16 -0800265 /* save a pointer for quick updates in pre-tbtt */
266 ifmsh->meshconf_offset = pos - skb->data;
267
Thomas Pedersen082ebb02011-08-11 19:35:10 -0700268 /* Active path selection protocol ID */
269 *pos++ = ifmsh->mesh_pp_id;
270 /* Active path selection metric ID */
271 *pos++ = ifmsh->mesh_pm_id;
272 /* Congestion control mode identifier */
273 *pos++ = ifmsh->mesh_cc_id;
274 /* Synchronization protocol identifier */
275 *pos++ = ifmsh->mesh_sp_id;
276 /* Authentication Protocol identifier */
277 *pos++ = ifmsh->mesh_auth_id;
278 /* Mesh Formation Info - number of neighbors */
Ashok Nagarajan1258d972012-10-09 13:27:47 -0700279 neighbors = atomic_read(&ifmsh->estab_plinks);
Jacob Minshalle05eccc2013-05-29 14:32:36 -0700280 neighbors = min_t(int, neighbors, IEEE80211_MAX_MESH_PEERINGS);
Thomas Pedersen082ebb02011-08-11 19:35:10 -0700281 *pos++ = neighbors << 1;
282 /* Mesh capability */
Chun-Yeow Yeohb60e5272013-07-12 18:55:22 +0800283 *pos = 0x00;
284 *pos |= ifmsh->mshcfg.dot11MeshForwarding ?
285 IEEE80211_MESHCONF_CAPAB_FORWARDING : 0x00;
Javier Cardonadbf498f2012-03-31 11:31:32 -0700286 *pos |= ifmsh->accepting_plinks ?
Johannes Bergbf7cd942013-02-15 14:40:31 +0100287 IEEE80211_MESHCONF_CAPAB_ACCEPT_PLINKS : 0x00;
Marco Porsch3f52b7e2013-01-30 18:14:08 +0100288 /* Mesh PS mode. See IEEE802.11-2012 8.4.2.100.8 */
289 *pos |= ifmsh->ps_peers_deep_sleep ?
Johannes Bergbf7cd942013-02-15 14:40:31 +0100290 IEEE80211_MESHCONF_CAPAB_POWER_SAVE_LEVEL : 0x00;
Javier Cardonadbf498f2012-03-31 11:31:32 -0700291 *pos++ |= ifmsh->adjusting_tbtt ?
Johannes Bergbf7cd942013-02-15 14:40:31 +0100292 IEEE80211_MESHCONF_CAPAB_TBTT_ADJUSTING : 0x00;
Thomas Pedersen082ebb02011-08-11 19:35:10 -0700293 *pos++ = 0x00;
294
295 return 0;
296}
297
Johannes Bergbf7cd942013-02-15 14:40:31 +0100298int mesh_add_meshid_ie(struct ieee80211_sub_if_data *sdata, struct sk_buff *skb)
Thomas Pedersen082ebb02011-08-11 19:35:10 -0700299{
300 struct ieee80211_if_mesh *ifmsh = &sdata->u.mesh;
301 u8 *pos;
302
303 if (skb_tailroom(skb) < 2 + ifmsh->mesh_id_len)
304 return -ENOMEM;
305
306 pos = skb_put(skb, 2 + ifmsh->mesh_id_len);
307 *pos++ = WLAN_EID_MESH_ID;
308 *pos++ = ifmsh->mesh_id_len;
309 if (ifmsh->mesh_id_len)
310 memcpy(pos, ifmsh->mesh_id, ifmsh->mesh_id_len);
311
312 return 0;
313}
314
Johannes Bergbf7cd942013-02-15 14:40:31 +0100315static int mesh_add_awake_window_ie(struct ieee80211_sub_if_data *sdata,
316 struct sk_buff *skb)
Marco Porsch3f52b7e2013-01-30 18:14:08 +0100317{
318 struct ieee80211_if_mesh *ifmsh = &sdata->u.mesh;
319 u8 *pos;
320
321 /* see IEEE802.11-2012 13.14.6 */
322 if (ifmsh->ps_peers_light_sleep == 0 &&
323 ifmsh->ps_peers_deep_sleep == 0 &&
324 ifmsh->nonpeer_pm == NL80211_MESH_POWER_ACTIVE)
325 return 0;
326
327 if (skb_tailroom(skb) < 4)
328 return -ENOMEM;
329
330 pos = skb_put(skb, 2 + 2);
331 *pos++ = WLAN_EID_MESH_AWAKE_WINDOW;
332 *pos++ = 2;
333 put_unaligned_le16(ifmsh->mshcfg.dot11MeshAwakeWindowDuration, pos);
334
335 return 0;
336}
337
Johannes Bergbf7cd942013-02-15 14:40:31 +0100338int mesh_add_vendor_ies(struct ieee80211_sub_if_data *sdata,
339 struct sk_buff *skb)
Thomas Pedersen082ebb02011-08-11 19:35:10 -0700340{
341 struct ieee80211_if_mesh *ifmsh = &sdata->u.mesh;
342 u8 offset, len;
343 const u8 *data;
344
345 if (!ifmsh->ie || !ifmsh->ie_len)
346 return 0;
347
348 /* fast-forward to vendor IEs */
349 offset = ieee80211_ie_split_vendor(ifmsh->ie, ifmsh->ie_len, 0);
350
351 if (offset) {
352 len = ifmsh->ie_len - offset;
353 data = ifmsh->ie + offset;
354 if (skb_tailroom(skb) < len)
355 return -ENOMEM;
356 memcpy(skb_put(skb, len), data, len);
357 }
358
359 return 0;
360}
361
Johannes Bergbf7cd942013-02-15 14:40:31 +0100362int mesh_add_rsn_ie(struct ieee80211_sub_if_data *sdata, struct sk_buff *skb)
Thomas Pedersen082ebb02011-08-11 19:35:10 -0700363{
364 struct ieee80211_if_mesh *ifmsh = &sdata->u.mesh;
365 u8 len = 0;
366 const u8 *data;
367
368 if (!ifmsh->ie || !ifmsh->ie_len)
369 return 0;
370
371 /* find RSN IE */
Bob Copelanda40a8c12014-04-15 10:43:07 -0400372 data = cfg80211_find_ie(WLAN_EID_RSN, ifmsh->ie, ifmsh->ie_len);
373 if (!data)
374 return 0;
Thomas Pedersen082ebb02011-08-11 19:35:10 -0700375
Bob Copelanda40a8c12014-04-15 10:43:07 -0400376 len = data[1] + 2;
377
378 if (skb_tailroom(skb) < len)
379 return -ENOMEM;
380 memcpy(skb_put(skb, len), data, len);
Thomas Pedersen082ebb02011-08-11 19:35:10 -0700381
382 return 0;
383}
384
Johannes Bergbf7cd942013-02-15 14:40:31 +0100385static int mesh_add_ds_params_ie(struct ieee80211_sub_if_data *sdata,
386 struct sk_buff *skb)
Thomas Pedersen082ebb02011-08-11 19:35:10 -0700387{
Johannes Berg55de9082012-07-26 17:24:39 +0200388 struct ieee80211_chanctx_conf *chanctx_conf;
389 struct ieee80211_channel *chan;
Thomas Pedersen082ebb02011-08-11 19:35:10 -0700390 u8 *pos;
391
392 if (skb_tailroom(skb) < 3)
393 return -ENOMEM;
394
Johannes Berg55de9082012-07-26 17:24:39 +0200395 rcu_read_lock();
396 chanctx_conf = rcu_dereference(sdata->vif.chanctx_conf);
397 if (WARN_ON(!chanctx_conf)) {
398 rcu_read_unlock();
399 return -EINVAL;
400 }
Johannes Berg4bf88532012-11-09 11:39:59 +0100401 chan = chanctx_conf->def.chan;
Johannes Berg55de9082012-07-26 17:24:39 +0200402 rcu_read_unlock();
403
Emanuel Taube601513a2013-02-06 14:17:17 +0100404 pos = skb_put(skb, 2 + 1);
405 *pos++ = WLAN_EID_DS_PARAMS;
406 *pos++ = 1;
407 *pos++ = ieee80211_frequency_to_channel(chan->center_freq);
Rui Paulobe125c62009-11-09 23:46:54 +0000408
Thomas Pedersen082ebb02011-08-11 19:35:10 -0700409 return 0;
Luis Carlos Cobo2e3c8732008-02-23 15:17:09 +0100410}
411
Johannes Bergbf7cd942013-02-15 14:40:31 +0100412int mesh_add_ht_cap_ie(struct ieee80211_sub_if_data *sdata,
413 struct sk_buff *skb)
Thomas Pedersen176f3602011-10-26 14:47:27 -0700414{
415 struct ieee80211_local *local = sdata->local;
Johannes Berg55de9082012-07-26 17:24:39 +0200416 enum ieee80211_band band = ieee80211_get_sdata_band(sdata);
Thomas Pedersen176f3602011-10-26 14:47:27 -0700417 struct ieee80211_supported_band *sband;
418 u8 *pos;
419
Johannes Berg55de9082012-07-26 17:24:39 +0200420 sband = local->hw.wiphy->bands[band];
Thomas Pedersen176f3602011-10-26 14:47:27 -0700421 if (!sband->ht_cap.ht_supported ||
Simon Wunderlich0418a442013-05-16 13:00:31 +0200422 sdata->vif.bss_conf.chandef.width == NL80211_CHAN_WIDTH_20_NOHT ||
423 sdata->vif.bss_conf.chandef.width == NL80211_CHAN_WIDTH_5 ||
424 sdata->vif.bss_conf.chandef.width == NL80211_CHAN_WIDTH_10)
Thomas Pedersen176f3602011-10-26 14:47:27 -0700425 return 0;
426
427 if (skb_tailroom(skb) < 2 + sizeof(struct ieee80211_ht_cap))
428 return -ENOMEM;
429
430 pos = skb_put(skb, 2 + sizeof(struct ieee80211_ht_cap));
Ben Greearef96a8422011-11-18 11:32:00 -0800431 ieee80211_ie_build_ht_cap(pos, &sband->ht_cap, sband->ht_cap.cap);
Thomas Pedersen176f3602011-10-26 14:47:27 -0700432
433 return 0;
434}
435
Johannes Bergbf7cd942013-02-15 14:40:31 +0100436int mesh_add_ht_oper_ie(struct ieee80211_sub_if_data *sdata,
437 struct sk_buff *skb)
Thomas Pedersen176f3602011-10-26 14:47:27 -0700438{
439 struct ieee80211_local *local = sdata->local;
Johannes Berg55de9082012-07-26 17:24:39 +0200440 struct ieee80211_chanctx_conf *chanctx_conf;
441 struct ieee80211_channel *channel;
Johannes Berg55de9082012-07-26 17:24:39 +0200442 struct ieee80211_supported_band *sband;
443 struct ieee80211_sta_ht_cap *ht_cap;
Thomas Pedersen176f3602011-10-26 14:47:27 -0700444 u8 *pos;
445
Johannes Berg55de9082012-07-26 17:24:39 +0200446 rcu_read_lock();
447 chanctx_conf = rcu_dereference(sdata->vif.chanctx_conf);
448 if (WARN_ON(!chanctx_conf)) {
449 rcu_read_unlock();
450 return -EINVAL;
451 }
Johannes Berg4bf88532012-11-09 11:39:59 +0100452 channel = chanctx_conf->def.chan;
Johannes Berg55de9082012-07-26 17:24:39 +0200453 rcu_read_unlock();
454
455 sband = local->hw.wiphy->bands[channel->band];
456 ht_cap = &sband->ht_cap;
457
Bob Copelandc85fb532015-08-27 09:00:18 -0400458 if (!ht_cap->ht_supported ||
459 sdata->vif.bss_conf.chandef.width == NL80211_CHAN_WIDTH_20_NOHT ||
460 sdata->vif.bss_conf.chandef.width == NL80211_CHAN_WIDTH_5 ||
461 sdata->vif.bss_conf.chandef.width == NL80211_CHAN_WIDTH_10)
Thomas Pedersen176f3602011-10-26 14:47:27 -0700462 return 0;
463
Johannes Berg074d46d2012-03-15 19:45:16 +0100464 if (skb_tailroom(skb) < 2 + sizeof(struct ieee80211_ht_operation))
Thomas Pedersen176f3602011-10-26 14:47:27 -0700465 return -ENOMEM;
466
Johannes Berg074d46d2012-03-15 19:45:16 +0100467 pos = skb_put(skb, 2 + sizeof(struct ieee80211_ht_operation));
Johannes Berg4bf88532012-11-09 11:39:59 +0100468 ieee80211_ie_build_ht_oper(pos, ht_cap, &sdata->vif.bss_conf.chandef,
Arik Nemtsov57f255f2015-10-25 10:59:34 +0200469 sdata->vif.bss_conf.ht_operation_mode,
470 false);
Thomas Pedersen176f3602011-10-26 14:47:27 -0700471
472 return 0;
473}
Johannes Bergbf7cd942013-02-15 14:40:31 +0100474
Bob Copelandc85fb532015-08-27 09:00:18 -0400475int mesh_add_vht_cap_ie(struct ieee80211_sub_if_data *sdata,
476 struct sk_buff *skb)
477{
478 struct ieee80211_local *local = sdata->local;
479 enum ieee80211_band band = ieee80211_get_sdata_band(sdata);
480 struct ieee80211_supported_band *sband;
481 u8 *pos;
482
483 sband = local->hw.wiphy->bands[band];
484 if (!sband->vht_cap.vht_supported ||
485 sdata->vif.bss_conf.chandef.width == NL80211_CHAN_WIDTH_20_NOHT ||
486 sdata->vif.bss_conf.chandef.width == NL80211_CHAN_WIDTH_5 ||
487 sdata->vif.bss_conf.chandef.width == NL80211_CHAN_WIDTH_10)
488 return 0;
489
490 if (skb_tailroom(skb) < 2 + sizeof(struct ieee80211_vht_cap))
491 return -ENOMEM;
492
493 pos = skb_put(skb, 2 + sizeof(struct ieee80211_vht_cap));
494 ieee80211_ie_build_vht_cap(pos, &sband->vht_cap, sband->vht_cap.cap);
495
496 return 0;
497}
498
499int mesh_add_vht_oper_ie(struct ieee80211_sub_if_data *sdata,
500 struct sk_buff *skb)
501{
502 struct ieee80211_local *local = sdata->local;
503 struct ieee80211_chanctx_conf *chanctx_conf;
504 struct ieee80211_channel *channel;
505 struct ieee80211_supported_band *sband;
506 struct ieee80211_sta_vht_cap *vht_cap;
507 u8 *pos;
508
509 rcu_read_lock();
510 chanctx_conf = rcu_dereference(sdata->vif.chanctx_conf);
511 if (WARN_ON(!chanctx_conf)) {
512 rcu_read_unlock();
513 return -EINVAL;
514 }
515 channel = chanctx_conf->def.chan;
516 rcu_read_unlock();
517
518 sband = local->hw.wiphy->bands[channel->band];
519 vht_cap = &sband->vht_cap;
520
521 if (!vht_cap->vht_supported ||
522 sdata->vif.bss_conf.chandef.width == NL80211_CHAN_WIDTH_20_NOHT ||
523 sdata->vif.bss_conf.chandef.width == NL80211_CHAN_WIDTH_5 ||
524 sdata->vif.bss_conf.chandef.width == NL80211_CHAN_WIDTH_10)
525 return 0;
526
527 if (skb_tailroom(skb) < 2 + sizeof(struct ieee80211_vht_operation))
528 return -ENOMEM;
529
530 pos = skb_put(skb, 2 + sizeof(struct ieee80211_vht_operation));
531 ieee80211_ie_build_vht_oper(pos, vht_cap,
532 &sdata->vif.bss_conf.chandef);
533
534 return 0;
535}
536
Luis Carlos Cobo2e3c8732008-02-23 15:17:09 +0100537static void ieee80211_mesh_path_timer(unsigned long data)
538{
539 struct ieee80211_sub_if_data *sdata =
540 (struct ieee80211_sub_if_data *) data;
Luis Carlos Cobo2e3c8732008-02-23 15:17:09 +0100541
Stanislaw Gruszka690205f2013-02-28 10:55:29 +0100542 ieee80211_queue_work(&sdata->local->hw, &sdata->work);
Luis Carlos Cobo2e3c8732008-02-23 15:17:09 +0100543}
544
Rui Pauloe304bfd2009-11-09 23:46:56 +0000545static void ieee80211_mesh_path_root_timer(unsigned long data)
546{
547 struct ieee80211_sub_if_data *sdata =
548 (struct ieee80211_sub_if_data *) data;
549 struct ieee80211_if_mesh *ifmsh = &sdata->u.mesh;
Rui Pauloe304bfd2009-11-09 23:46:56 +0000550
551 set_bit(MESH_WORK_ROOT, &ifmsh->wrkq_flags);
552
Stanislaw Gruszka690205f2013-02-28 10:55:29 +0100553 ieee80211_queue_work(&sdata->local->hw, &sdata->work);
Rui Pauloe304bfd2009-11-09 23:46:56 +0000554}
555
Rui Paulo63c57232009-11-09 23:46:57 +0000556void ieee80211_mesh_root_setup(struct ieee80211_if_mesh *ifmsh)
557{
Chun-Yeow Yeohdbb912c2012-06-14 02:06:09 +0800558 if (ifmsh->mshcfg.dot11MeshHWMPRootMode > IEEE80211_ROOTMODE_ROOT)
Rui Paulo63c57232009-11-09 23:46:57 +0000559 set_bit(MESH_WORK_ROOT, &ifmsh->wrkq_flags);
560 else {
561 clear_bit(MESH_WORK_ROOT, &ifmsh->wrkq_flags);
562 /* stop running timer */
563 del_timer_sync(&ifmsh->mesh_path_root_timer);
564 }
565}
566
Johannes Berg902acc72008-02-23 15:17:19 +0100567/**
Javier Cardona3c5772a2009-08-10 12:15:48 -0700568 * ieee80211_fill_mesh_addresses - fill addresses of a locally originated mesh frame
Johannes Bergbf7cd942013-02-15 14:40:31 +0100569 * @hdr: 802.11 frame header
Javier Cardona3c5772a2009-08-10 12:15:48 -0700570 * @fc: frame control field
571 * @meshda: destination address in the mesh
572 * @meshsa: source address address in the mesh. Same as TA, as frame is
573 * locally originated.
574 *
575 * Return the length of the 802.11 (does not include a mesh control header)
576 */
Johannes Berg15ff6362009-11-17 13:34:04 +0100577int ieee80211_fill_mesh_addresses(struct ieee80211_hdr *hdr, __le16 *fc,
578 const u8 *meshda, const u8 *meshsa)
579{
Javier Cardona3c5772a2009-08-10 12:15:48 -0700580 if (is_multicast_ether_addr(meshda)) {
581 *fc |= cpu_to_le16(IEEE80211_FCTL_FROMDS);
582 /* DA TA SA */
583 memcpy(hdr->addr1, meshda, ETH_ALEN);
584 memcpy(hdr->addr2, meshsa, ETH_ALEN);
585 memcpy(hdr->addr3, meshsa, ETH_ALEN);
586 return 24;
587 } else {
Javier Cardona2154c812011-09-07 17:49:53 -0700588 *fc |= cpu_to_le16(IEEE80211_FCTL_FROMDS | IEEE80211_FCTL_TODS);
Javier Cardona3c5772a2009-08-10 12:15:48 -0700589 /* RA TA DA SA */
Joe Perchesc84a67a2015-03-02 19:54:57 -0800590 eth_zero_addr(hdr->addr1); /* RA is resolved later */
Javier Cardona3c5772a2009-08-10 12:15:48 -0700591 memcpy(hdr->addr2, meshsa, ETH_ALEN);
592 memcpy(hdr->addr3, meshda, ETH_ALEN);
593 memcpy(hdr->addr4, meshsa, ETH_ALEN);
594 return 30;
595 }
596}
597
598/**
Johannes Berg902acc72008-02-23 15:17:19 +0100599 * ieee80211_new_mesh_header - create a new mesh header
Johannes Berg902acc72008-02-23 15:17:19 +0100600 * @sdata: mesh interface to be used
Johannes Bergbf7cd942013-02-15 14:40:31 +0100601 * @meshhdr: uninitialized mesh header
Javier Cardona61ad5392010-12-16 17:23:34 -0800602 * @addr4or5: 1st address in the ae header, which may correspond to address 4
603 * (if addr6 is NULL) or address 5 (if addr6 is present). It may
604 * be NULL.
605 * @addr6: 2nd address in the ae header, which corresponds to addr6 of the
606 * mesh frame
Johannes Berg902acc72008-02-23 15:17:19 +0100607 *
608 * Return the header length.
609 */
Andrzej Hajda5edfcee2015-09-25 08:42:00 +0200610unsigned int ieee80211_new_mesh_header(struct ieee80211_sub_if_data *sdata,
611 struct ieee80211s_hdr *meshhdr,
612 const char *addr4or5, const char *addr6)
Johannes Berg902acc72008-02-23 15:17:19 +0100613{
Johannes Bergbf7cd942013-02-15 14:40:31 +0100614 if (WARN_ON(!addr4or5 && addr6))
615 return 0;
616
Julia Lawall0c3cee72009-12-09 20:25:59 +0100617 memset(meshhdr, 0, sizeof(*meshhdr));
Johannes Bergbf7cd942013-02-15 14:40:31 +0100618
Johannes Berg472dbc42008-09-11 00:01:49 +0200619 meshhdr->ttl = sdata->u.mesh.mshcfg.dot11MeshTTL;
Johannes Bergbf7cd942013-02-15 14:40:31 +0100620
621 /* FIXME: racy -- TX on multiple queues can be concurrent */
Johannes Berg472dbc42008-09-11 00:01:49 +0200622 put_unaligned(cpu_to_le32(sdata->u.mesh.mesh_seqnum), &meshhdr->seqnum);
623 sdata->u.mesh.mesh_seqnum++;
Johannes Bergbf7cd942013-02-15 14:40:31 +0100624
Javier Cardona61ad5392010-12-16 17:23:34 -0800625 if (addr4or5 && !addr6) {
Javier Cardona3c5772a2009-08-10 12:15:48 -0700626 meshhdr->flags |= MESH_FLAGS_AE_A4;
Javier Cardona61ad5392010-12-16 17:23:34 -0800627 memcpy(meshhdr->eaddr1, addr4or5, ETH_ALEN);
Johannes Bergbf7cd942013-02-15 14:40:31 +0100628 return 2 * ETH_ALEN;
Javier Cardona61ad5392010-12-16 17:23:34 -0800629 } else if (addr4or5 && addr6) {
Javier Cardona3c5772a2009-08-10 12:15:48 -0700630 meshhdr->flags |= MESH_FLAGS_AE_A5_A6;
Javier Cardona61ad5392010-12-16 17:23:34 -0800631 memcpy(meshhdr->eaddr1, addr4or5, ETH_ALEN);
632 memcpy(meshhdr->eaddr2, addr6, ETH_ALEN);
Johannes Bergbf7cd942013-02-15 14:40:31 +0100633 return 3 * ETH_ALEN;
Javier Cardona3c5772a2009-08-10 12:15:48 -0700634 }
Johannes Bergbf7cd942013-02-15 14:40:31 +0100635
636 return ETH_ALEN;
Johannes Berg902acc72008-02-23 15:17:19 +0100637}
638
Johannes Bergbf7cd942013-02-15 14:40:31 +0100639static void ieee80211_mesh_housekeeping(struct ieee80211_sub_if_data *sdata)
Johannes Berg472dbc42008-09-11 00:01:49 +0200640{
Johannes Bergbf7cd942013-02-15 14:40:31 +0100641 struct ieee80211_if_mesh *ifmsh = &sdata->u.mesh;
Marco Porschdf323812012-08-08 07:58:43 +0200642 u32 changed;
Johannes Berg472dbc42008-09-11 00:01:49 +0200643
Masashi Honma31f909a2015-02-24 22:42:16 +0900644 if (ifmsh->mshcfg.plink_timeout > 0)
645 ieee80211_sta_expire(sdata, ifmsh->mshcfg.plink_timeout * HZ);
Johannes Berg472dbc42008-09-11 00:01:49 +0200646 mesh_path_expire(sdata);
647
Marco Porschdf323812012-08-08 07:58:43 +0200648 changed = mesh_accept_plinks_update(sdata);
Thomas Pedersen2b5e1962013-02-14 11:20:13 -0800649 ieee80211_mbss_info_change_notify(sdata, changed);
Johannes Berg472dbc42008-09-11 00:01:49 +0200650
Johannes Berg472dbc42008-09-11 00:01:49 +0200651 mod_timer(&ifmsh->housekeeping_timer,
Johannes Bergbf7cd942013-02-15 14:40:31 +0100652 round_jiffies(jiffies +
653 IEEE80211_MESH_HOUSEKEEPING_INTERVAL));
Johannes Berg472dbc42008-09-11 00:01:49 +0200654}
655
Rui Pauloe304bfd2009-11-09 23:46:56 +0000656static void ieee80211_mesh_rootpath(struct ieee80211_sub_if_data *sdata)
657{
658 struct ieee80211_if_mesh *ifmsh = &sdata->u.mesh;
Chun-Yeow Yeoha69cc442012-06-14 02:06:07 +0800659 u32 interval;
Rui Pauloe304bfd2009-11-09 23:46:56 +0000660
661 mesh_path_tx_root_frame(sdata);
Chun-Yeow Yeoha69cc442012-06-14 02:06:07 +0800662
663 if (ifmsh->mshcfg.dot11MeshHWMPRootMode == IEEE80211_PROACTIVE_RANN)
664 interval = ifmsh->mshcfg.dot11MeshHWMPRannInterval;
665 else
666 interval = ifmsh->mshcfg.dot11MeshHWMProotInterval;
667
Rui Pauloe304bfd2009-11-09 23:46:56 +0000668 mod_timer(&ifmsh->mesh_path_root_timer,
Chun-Yeow Yeoha69cc442012-06-14 02:06:07 +0800669 round_jiffies(TU_TO_EXP_TIME(interval)));
Rui Pauloe304bfd2009-11-09 23:46:56 +0000670}
671
Thomas Pedersen2b5e1962013-02-14 11:20:13 -0800672static int
673ieee80211_mesh_build_beacon(struct ieee80211_if_mesh *ifmsh)
674{
675 struct beacon_data *bcn;
676 int head_len, tail_len;
677 struct sk_buff *skb;
678 struct ieee80211_mgmt *mgmt;
679 struct ieee80211_chanctx_conf *chanctx_conf;
Chun-Yeow Yeohb8456a12013-10-17 15:55:02 -0700680 struct mesh_csa_settings *csa;
Thomas Pedersen2b5e1962013-02-14 11:20:13 -0800681 enum ieee80211_band band;
682 u8 *pos;
683 struct ieee80211_sub_if_data *sdata;
684 int hdr_len = offsetof(struct ieee80211_mgmt, u.beacon) +
685 sizeof(mgmt->u.beacon);
686
687 sdata = container_of(ifmsh, struct ieee80211_sub_if_data, u.mesh);
688 rcu_read_lock();
689 chanctx_conf = rcu_dereference(sdata->vif.chanctx_conf);
690 band = chanctx_conf->def.chan->band;
691 rcu_read_unlock();
692
693 head_len = hdr_len +
694 2 + /* NULL SSID */
Chun-Yeow Yeohb8456a12013-10-17 15:55:02 -0700695 /* Channel Switch Announcement */
696 2 + sizeof(struct ieee80211_channel_sw_ie) +
697 /* Mesh Channel Swith Parameters */
698 2 + sizeof(struct ieee80211_mesh_chansw_params_ie) +
Thomas Pedersen2b5e1962013-02-14 11:20:13 -0800699 2 + 8 + /* supported rates */
700 2 + 3; /* DS params */
701 tail_len = 2 + (IEEE80211_MAX_SUPP_RATES - 8) +
702 2 + sizeof(struct ieee80211_ht_cap) +
703 2 + sizeof(struct ieee80211_ht_operation) +
704 2 + ifmsh->mesh_id_len +
705 2 + sizeof(struct ieee80211_meshconf_ie) +
706 2 + sizeof(__le16) + /* awake window */
Bob Copelandc85fb532015-08-27 09:00:18 -0400707 2 + sizeof(struct ieee80211_vht_cap) +
708 2 + sizeof(struct ieee80211_vht_operation) +
Thomas Pedersen2b5e1962013-02-14 11:20:13 -0800709 ifmsh->ie_len;
710
711 bcn = kzalloc(sizeof(*bcn) + head_len + tail_len, GFP_KERNEL);
712 /* need an skb for IE builders to operate on */
713 skb = dev_alloc_skb(max(head_len, tail_len));
714
715 if (!bcn || !skb)
716 goto out_free;
717
718 /*
719 * pointers go into the block we allocated,
720 * memory is | beacon_data | head | tail |
721 */
722 bcn->head = ((u8 *) bcn) + sizeof(*bcn);
723
724 /* fill in the head */
725 mgmt = (struct ieee80211_mgmt *) skb_put(skb, hdr_len);
726 memset(mgmt, 0, hdr_len);
727 mgmt->frame_control = cpu_to_le16(IEEE80211_FTYPE_MGMT |
728 IEEE80211_STYPE_BEACON);
729 eth_broadcast_addr(mgmt->da);
730 memcpy(mgmt->sa, sdata->vif.addr, ETH_ALEN);
731 memcpy(mgmt->bssid, sdata->vif.addr, ETH_ALEN);
732 ieee80211_mps_set_frame_flags(sdata, NULL, (void *) mgmt);
733 mgmt->u.beacon.beacon_int =
734 cpu_to_le16(sdata->vif.bss_conf.beacon_int);
735 mgmt->u.beacon.capab_info |= cpu_to_le16(
736 sdata->u.mesh.security ? WLAN_CAPABILITY_PRIVACY : 0);
737
738 pos = skb_put(skb, 2);
739 *pos++ = WLAN_EID_SSID;
740 *pos++ = 0x0;
741
Chun-Yeow Yeohb8456a12013-10-17 15:55:02 -0700742 rcu_read_lock();
743 csa = rcu_dereference(ifmsh->csa);
744 if (csa) {
Chun-Yeow Yeohb8456a12013-10-17 15:55:02 -0700745 pos = skb_put(skb, 13);
746 memset(pos, 0, 13);
747 *pos++ = WLAN_EID_CHANNEL_SWITCH;
748 *pos++ = 3;
749 *pos++ = 0x0;
750 *pos++ = ieee80211_frequency_to_channel(
751 csa->settings.chandef.chan->center_freq);
Chun-Yeow Yeoh8df734e2015-06-09 13:35:33 +0800752 bcn->csa_current_counter = csa->settings.count;
Michal Kazioraf296bd2014-06-05 14:21:36 +0200753 bcn->csa_counter_offsets[0] = hdr_len + 6;
Chun-Yeow Yeohb8456a12013-10-17 15:55:02 -0700754 *pos++ = csa->settings.count;
755 *pos++ = WLAN_EID_CHAN_SWITCH_PARAM;
756 *pos++ = 6;
Luciano Coelho0cb4d4d2014-01-13 19:42:58 +0200757 if (ifmsh->csa_role == IEEE80211_MESH_CSA_ROLE_INIT) {
Chun-Yeow Yeohb8456a12013-10-17 15:55:02 -0700758 *pos++ = ifmsh->mshcfg.dot11MeshTTL;
759 *pos |= WLAN_EID_CHAN_SWITCH_PARAM_INITIATOR;
760 } else {
761 *pos++ = ifmsh->chsw_ttl;
762 }
763 *pos++ |= csa->settings.block_tx ?
764 WLAN_EID_CHAN_SWITCH_PARAM_TX_RESTRICT : 0x00;
765 put_unaligned_le16(WLAN_REASON_MESH_CHAN, pos);
766 pos += 2;
Chun-Yeow Yeohca91dc92013-11-12 10:31:48 +0800767 put_unaligned_le16(ifmsh->pre_value, pos);
Chun-Yeow Yeohb8456a12013-10-17 15:55:02 -0700768 pos += 2;
769 }
770 rcu_read_unlock();
771
Thomas Pedersen2b5e1962013-02-14 11:20:13 -0800772 if (ieee80211_add_srates_ie(sdata, skb, true, band) ||
Johannes Bergbf7cd942013-02-15 14:40:31 +0100773 mesh_add_ds_params_ie(sdata, skb))
Thomas Pedersen2b5e1962013-02-14 11:20:13 -0800774 goto out_free;
775
776 bcn->head_len = skb->len;
777 memcpy(bcn->head, skb->data, bcn->head_len);
778
779 /* now the tail */
780 skb_trim(skb, 0);
781 bcn->tail = bcn->head + bcn->head_len;
782
783 if (ieee80211_add_ext_srates_ie(sdata, skb, true, band) ||
Johannes Bergbf7cd942013-02-15 14:40:31 +0100784 mesh_add_rsn_ie(sdata, skb) ||
785 mesh_add_ht_cap_ie(sdata, skb) ||
786 mesh_add_ht_oper_ie(sdata, skb) ||
787 mesh_add_meshid_ie(sdata, skb) ||
788 mesh_add_meshconf_ie(sdata, skb) ||
789 mesh_add_awake_window_ie(sdata, skb) ||
Bob Copelandc85fb532015-08-27 09:00:18 -0400790 mesh_add_vht_cap_ie(sdata, skb) ||
791 mesh_add_vht_oper_ie(sdata, skb) ||
Johannes Bergbf7cd942013-02-15 14:40:31 +0100792 mesh_add_vendor_ies(sdata, skb))
Thomas Pedersen2b5e1962013-02-14 11:20:13 -0800793 goto out_free;
794
795 bcn->tail_len = skb->len;
796 memcpy(bcn->tail, skb->data, bcn->tail_len);
Thomas Pedersen43552be2013-12-15 13:14:16 -0800797 bcn->meshconf = (struct ieee80211_meshconf_ie *)
798 (bcn->tail + ifmsh->meshconf_offset);
Thomas Pedersen2b5e1962013-02-14 11:20:13 -0800799
800 dev_kfree_skb(skb);
801 rcu_assign_pointer(ifmsh->beacon, bcn);
802 return 0;
803out_free:
804 kfree(bcn);
805 dev_kfree_skb(skb);
806 return -ENOMEM;
807}
808
809static int
Johannes Berg8d61ffa2013-05-10 12:32:47 +0200810ieee80211_mesh_rebuild_beacon(struct ieee80211_sub_if_data *sdata)
Thomas Pedersen2b5e1962013-02-14 11:20:13 -0800811{
Thomas Pedersen2b5e1962013-02-14 11:20:13 -0800812 struct beacon_data *old_bcn;
813 int ret;
Thomas Pedersen2b5e1962013-02-14 11:20:13 -0800814
Johannes Berg8d61ffa2013-05-10 12:32:47 +0200815 old_bcn = rcu_dereference_protected(sdata->u.mesh.beacon,
816 lockdep_is_held(&sdata->wdev.mtx));
817 ret = ieee80211_mesh_build_beacon(&sdata->u.mesh);
Thomas Pedersen2b5e1962013-02-14 11:20:13 -0800818 if (ret)
819 /* just reuse old beacon */
Johannes Berg8d61ffa2013-05-10 12:32:47 +0200820 return ret;
Thomas Pedersen2b5e1962013-02-14 11:20:13 -0800821
822 if (old_bcn)
823 kfree_rcu(old_bcn, rcu_head);
Johannes Berg8d61ffa2013-05-10 12:32:47 +0200824 return 0;
Thomas Pedersen2b5e1962013-02-14 11:20:13 -0800825}
826
827void ieee80211_mbss_info_change_notify(struct ieee80211_sub_if_data *sdata,
828 u32 changed)
829{
Thomas Pedersenf81a9de2013-06-13 15:54:41 -0700830 struct ieee80211_if_mesh *ifmsh = &sdata->u.mesh;
831 unsigned long bits = changed;
832 u32 bit;
833
834 if (!bits)
835 return;
836
837 /* if we race with running work, worst case this work becomes a noop */
838 for_each_set_bit(bit, &bits, sizeof(changed) * BITS_PER_BYTE)
839 set_bit(bit, &ifmsh->mbss_changed);
840 set_bit(MESH_WORK_MBSS_CHANGED, &ifmsh->wrkq_flags);
841 ieee80211_queue_work(&sdata->local->hw, &sdata->work);
Thomas Pedersen2b5e1962013-02-14 11:20:13 -0800842}
843
844int ieee80211_start_mesh(struct ieee80211_sub_if_data *sdata)
Johannes Berg472dbc42008-09-11 00:01:49 +0200845{
846 struct ieee80211_if_mesh *ifmsh = &sdata->u.mesh;
847 struct ieee80211_local *local = sdata->local;
Chun-Yeow Yeohf4eabc92012-12-13 18:59:57 +0800848 u32 changed = BSS_CHANGED_BEACON |
849 BSS_CHANGED_BEACON_ENABLED |
850 BSS_CHANGED_HT |
851 BSS_CHANGED_BASIC_RATES |
852 BSS_CHANGED_BEACON_INT;
Johannes Berg472dbc42008-09-11 00:01:49 +0200853
Johannes Berg09b17472010-12-03 09:20:41 +0100854 local->fif_other_bss++;
855 /* mesh ifaces must set allmulti to forward mcast traffic */
856 atomic_inc(&local->iff_allmultis);
857 ieee80211_configure_filter(local);
858
Javier Cardonac7108a72010-12-16 17:37:50 -0800859 ifmsh->mesh_cc_id = 0; /* Disabled */
Javier Cardonadbf498f2012-03-31 11:31:32 -0700860 /* register sync ops from extensible synchronization framework */
861 ifmsh->sync_ops = ieee80211_mesh_sync_ops_get(ifmsh->mesh_sp_id);
862 ifmsh->adjusting_tbtt = false;
863 ifmsh->sync_offset_clockdrift_max = 0;
Rui Paulo6b9ac442009-10-20 21:21:48 +0100864 set_bit(MESH_WORK_HOUSEKEEPING, &ifmsh->wrkq_flags);
Rui Paulo63c57232009-11-09 23:46:57 +0000865 ieee80211_mesh_root_setup(ifmsh);
Johannes Berg64592c82010-06-10 10:21:31 +0200866 ieee80211_queue_work(&local->hw, &sdata->work);
Ashok Nagarajan70c33ea2012-04-30 14:20:32 -0700867 sdata->vif.bss_conf.ht_operation_mode =
868 ifmsh->mshcfg.ht_opmode;
Johannes Bergd6a83222012-12-14 14:06:28 +0100869 sdata->vif.bss_conf.enable_beacon = true;
Chun-Yeow Yeohf4eabc92012-12-13 18:59:57 +0800870
Thomas Pedersen39886b62013-02-13 12:14:19 -0800871 changed |= ieee80211_mps_local_status_update(sdata);
Marco Porsch3f52b7e2013-01-30 18:14:08 +0100872
Thomas Pedersen2b5e1962013-02-14 11:20:13 -0800873 if (ieee80211_mesh_build_beacon(ifmsh)) {
874 ieee80211_stop_mesh(sdata);
875 return -ENOMEM;
876 }
877
Thomas Pedersen057d5f42013-12-19 10:25:15 -0800878 ieee80211_recalc_dtim(local, sdata);
Chun-Yeow Yeohf4eabc92012-12-13 18:59:57 +0800879 ieee80211_bss_info_change_notify(sdata, changed);
Johannes Bergc405c622012-07-30 19:44:12 +0200880
881 netif_carrier_on(sdata->dev);
Thomas Pedersen2b5e1962013-02-14 11:20:13 -0800882 return 0;
Johannes Berg472dbc42008-09-11 00:01:49 +0200883}
884
885void ieee80211_stop_mesh(struct ieee80211_sub_if_data *sdata)
886{
Johannes Berg09b17472010-12-03 09:20:41 +0100887 struct ieee80211_local *local = sdata->local;
Johannes Berg29cbe682010-12-03 09:20:44 +0100888 struct ieee80211_if_mesh *ifmsh = &sdata->u.mesh;
Thomas Pedersen2b5e1962013-02-14 11:20:13 -0800889 struct beacon_data *bcn;
Johannes Berg29cbe682010-12-03 09:20:44 +0100890
Johannes Bergc405c622012-07-30 19:44:12 +0200891 netif_carrier_off(sdata->dev);
892
Thomas Pedersen0d466b9c2012-08-03 12:21:32 -0700893 /* stop the beacon */
Johannes Berg29cbe682010-12-03 09:20:44 +0100894 ifmsh->mesh_id_len = 0;
Johannes Bergd6a83222012-12-14 14:06:28 +0100895 sdata->vif.bss_conf.enable_beacon = false;
896 clear_bit(SDATA_STATE_OFFCHANNEL_BEACON_STOPPED, &sdata->state);
Johannes Berg29cbe682010-12-03 09:20:44 +0100897 ieee80211_bss_info_change_notify(sdata, BSS_CHANGED_BEACON_ENABLED);
Thomas Pedersen2b5e1962013-02-14 11:20:13 -0800898 bcn = rcu_dereference_protected(ifmsh->beacon,
Johannes Berg8d61ffa2013-05-10 12:32:47 +0200899 lockdep_is_held(&sdata->wdev.mtx));
Monam Agarwal0c2bef462014-03-24 00:51:43 +0530900 RCU_INIT_POINTER(ifmsh->beacon, NULL);
Thomas Pedersen2b5e1962013-02-14 11:20:13 -0800901 kfree_rcu(bcn, rcu_head);
Thomas Pedersen0d466b9c2012-08-03 12:21:32 -0700902
903 /* flush STAs and mpaths on this iface */
Johannes Bergb998e8b2012-12-13 23:07:46 +0100904 sta_info_flush(sdata);
Thomas Pedersen0d466b9c2012-08-03 12:21:32 -0700905 mesh_path_flush_by_iface(sdata);
Johannes Berg09b17472010-12-03 09:20:41 +0100906
Marco Porsch3f52b7e2013-01-30 18:14:08 +0100907 /* free all potentially still buffered group-addressed frames */
908 local->total_ps_buffered -= skb_queue_len(&ifmsh->ps.bc_buf);
909 skb_queue_purge(&ifmsh->ps.bc_buf);
910
Johannes Berg472dbc42008-09-11 00:01:49 +0200911 del_timer_sync(&sdata->u.mesh.housekeeping_timer);
Rui Pauloe304bfd2009-11-09 23:46:56 +0000912 del_timer_sync(&sdata->u.mesh.mesh_path_root_timer);
Johannes Bergdd4c9262012-08-01 21:03:21 +0200913 del_timer_sync(&sdata->u.mesh.mesh_path_timer);
Johannes Berg09b17472010-12-03 09:20:41 +0100914
Thomas Pedersenf81a9de2013-06-13 15:54:41 -0700915 /* clear any mesh work (for next join) we may have accrued */
916 ifmsh->wrkq_flags = 0;
917 ifmsh->mbss_changed = 0;
918
Johannes Berg09b17472010-12-03 09:20:41 +0100919 local->fif_other_bss--;
920 atomic_dec(&local->iff_allmultis);
921 ieee80211_configure_filter(local);
Johannes Berg472dbc42008-09-11 00:01:49 +0200922}
923
Chun-Yeow Yeoh33a45862013-10-17 15:55:18 -0700924static bool
925ieee80211_mesh_process_chnswitch(struct ieee80211_sub_if_data *sdata,
926 struct ieee802_11_elems *elems, bool beacon)
927{
928 struct cfg80211_csa_settings params;
929 struct ieee80211_csa_ie csa_ie;
Chun-Yeow Yeoh33a45862013-10-17 15:55:18 -0700930 struct ieee80211_if_mesh *ifmsh = &sdata->u.mesh;
931 enum ieee80211_band band = ieee80211_get_sdata_band(sdata);
Luciano Coelho0cb4d4d2014-01-13 19:42:58 +0200932 int err;
Chun-Yeow Yeoh33a45862013-10-17 15:55:18 -0700933 u32 sta_flags;
934
Michal Kaziordbd72852014-01-29 07:56:21 +0100935 sdata_assert_lock(sdata);
936
Chun-Yeow Yeoh33a45862013-10-17 15:55:18 -0700937 sta_flags = IEEE80211_STA_DISABLE_VHT;
938 switch (sdata->vif.bss_conf.chandef.width) {
939 case NL80211_CHAN_WIDTH_20_NOHT:
940 sta_flags |= IEEE80211_STA_DISABLE_HT;
941 case NL80211_CHAN_WIDTH_20:
942 sta_flags |= IEEE80211_STA_DISABLE_40MHZ;
943 break;
944 default:
945 break;
946 }
947
948 memset(&params, 0, sizeof(params));
949 memset(&csa_ie, 0, sizeof(csa_ie));
Luciano Coelho84469a42014-10-28 13:33:04 +0200950 err = ieee80211_parse_ch_switch_ie(sdata, elems, band,
Chun-Yeow Yeoh33a45862013-10-17 15:55:18 -0700951 sta_flags, sdata->vif.addr,
952 &csa_ie);
953 if (err < 0)
954 return false;
955 if (err)
956 return false;
957
958 params.chandef = csa_ie.chandef;
959 params.count = csa_ie.count;
960
Chun-Yeow Yeoh33a45862013-10-17 15:55:18 -0700961 if (!cfg80211_chandef_usable(sdata->local->hw.wiphy, &params.chandef,
962 IEEE80211_CHAN_DISABLED)) {
963 sdata_info(sdata,
964 "mesh STA %pM switches to unsupported channel (%d MHz, width:%d, CF1/2: %d/%d MHz), aborting\n",
965 sdata->vif.addr,
966 params.chandef.chan->center_freq,
967 params.chandef.width,
968 params.chandef.center_freq1,
969 params.chandef.center_freq2);
970 return false;
971 }
972
973 err = cfg80211_chandef_dfs_required(sdata->local->hw.wiphy,
Luciano Coelho2beb6dab2014-02-18 11:40:36 +0200974 &params.chandef,
975 NL80211_IFTYPE_MESH_POINT);
Chun-Yeow Yeoh33a45862013-10-17 15:55:18 -0700976 if (err < 0)
977 return false;
Luciano Coelho2beb6dab2014-02-18 11:40:36 +0200978 if (err > 0)
Chun-Yeow Yeoh33a45862013-10-17 15:55:18 -0700979 /* TODO: DFS not (yet) supported */
980 return false;
Luciano Coelho2beb6dab2014-02-18 11:40:36 +0200981
982 params.radar_required = err;
Chun-Yeow Yeoh33a45862013-10-17 15:55:18 -0700983
Luciano Coelho0cb4d4d2014-01-13 19:42:58 +0200984 if (cfg80211_chandef_identical(&params.chandef,
985 &sdata->vif.bss_conf.chandef)) {
986 mcsa_dbg(sdata,
987 "received csa with an identical chandef, ignoring\n");
988 return true;
989 }
Chun-Yeow Yeoh33a45862013-10-17 15:55:18 -0700990
991 mcsa_dbg(sdata,
992 "received channel switch announcement to go to channel %d MHz\n",
993 params.chandef.chan->center_freq);
994
995 params.block_tx = csa_ie.mode & WLAN_EID_CHAN_SWITCH_PARAM_TX_RESTRICT;
Chun-Yeow Yeoh3f718fd2013-11-08 15:09:43 +0800996 if (beacon) {
Chun-Yeow Yeoh33a45862013-10-17 15:55:18 -0700997 ifmsh->chsw_ttl = csa_ie.ttl - 1;
Chun-Yeow Yeoh3f718fd2013-11-08 15:09:43 +0800998 if (ifmsh->pre_value >= csa_ie.pre_value)
999 return false;
1000 ifmsh->pre_value = csa_ie.pre_value;
1001 }
Chun-Yeow Yeoh33a45862013-10-17 15:55:18 -07001002
Luciano Coelho0cb4d4d2014-01-13 19:42:58 +02001003 if (ifmsh->chsw_ttl >= ifmsh->mshcfg.dot11MeshTTL)
Chun-Yeow Yeoh3f718fd2013-11-08 15:09:43 +08001004 return false;
Chun-Yeow Yeoh33a45862013-10-17 15:55:18 -07001005
Luciano Coelho0cb4d4d2014-01-13 19:42:58 +02001006 ifmsh->csa_role = IEEE80211_MESH_CSA_ROLE_REPEATER;
Chun-Yeow Yeoh33a45862013-10-17 15:55:18 -07001007
Luciano Coelho0cb4d4d2014-01-13 19:42:58 +02001008 if (ieee80211_channel_switch(sdata->local->hw.wiphy, sdata->dev,
1009 &params) < 0)
1010 return false;
Chun-Yeow Yeoh33a45862013-10-17 15:55:18 -07001011
1012 return true;
Chun-Yeow Yeoh33a45862013-10-17 15:55:18 -07001013}
1014
Thomas Pedersen9fb04b52013-02-14 11:20:14 -08001015static void
1016ieee80211_mesh_rx_probe_req(struct ieee80211_sub_if_data *sdata,
1017 struct ieee80211_mgmt *mgmt, size_t len)
1018{
1019 struct ieee80211_local *local = sdata->local;
1020 struct ieee80211_if_mesh *ifmsh = &sdata->u.mesh;
1021 struct sk_buff *presp;
1022 struct beacon_data *bcn;
1023 struct ieee80211_mgmt *hdr;
1024 struct ieee802_11_elems elems;
1025 size_t baselen;
Johannes Berg511044e2013-03-07 22:47:00 +01001026 u8 *pos;
Thomas Pedersen9fb04b52013-02-14 11:20:14 -08001027
Thomas Pedersen9fb04b52013-02-14 11:20:14 -08001028 pos = mgmt->u.probe_req.variable;
1029 baselen = (u8 *) pos - (u8 *) mgmt;
1030 if (baselen > len)
1031 return;
1032
Johannes Bergb2e506b2013-03-26 14:54:16 +01001033 ieee802_11_parse_elems(pos, len - baselen, false, &elems);
Thomas Pedersen9fb04b52013-02-14 11:20:14 -08001034
Chun-Yeow Yeoha4ef66a2013-08-22 10:28:58 -07001035 if (!elems.mesh_id)
1036 return;
1037
Thomas Pedersen9fb04b52013-02-14 11:20:14 -08001038 /* 802.11-2012 10.1.4.3.2 */
1039 if ((!ether_addr_equal(mgmt->da, sdata->vif.addr) &&
1040 !is_broadcast_ether_addr(mgmt->da)) ||
1041 elems.ssid_len != 0)
1042 return;
1043
1044 if (elems.mesh_id_len != 0 &&
1045 (elems.mesh_id_len != ifmsh->mesh_id_len ||
1046 memcmp(elems.mesh_id, ifmsh->mesh_id, ifmsh->mesh_id_len)))
1047 return;
1048
1049 rcu_read_lock();
1050 bcn = rcu_dereference(ifmsh->beacon);
1051
1052 if (!bcn)
1053 goto out;
1054
1055 presp = dev_alloc_skb(local->tx_headroom +
1056 bcn->head_len + bcn->tail_len);
1057 if (!presp)
1058 goto out;
1059
1060 skb_reserve(presp, local->tx_headroom);
1061 memcpy(skb_put(presp, bcn->head_len), bcn->head, bcn->head_len);
1062 memcpy(skb_put(presp, bcn->tail_len), bcn->tail, bcn->tail_len);
1063 hdr = (struct ieee80211_mgmt *) presp->data;
1064 hdr->frame_control = cpu_to_le16(IEEE80211_FTYPE_MGMT |
1065 IEEE80211_STYPE_PROBE_RESP);
1066 memcpy(hdr->da, mgmt->sa, ETH_ALEN);
Thomas Pedersen9fb04b52013-02-14 11:20:14 -08001067 IEEE80211_SKB_CB(presp)->flags |= IEEE80211_TX_INTFL_DONT_ENCRYPT;
1068 ieee80211_tx_skb(sdata, presp);
1069out:
1070 rcu_read_unlock();
1071}
1072
Johannes Berg472dbc42008-09-11 00:01:49 +02001073static void ieee80211_mesh_rx_bcn_presp(struct ieee80211_sub_if_data *sdata,
1074 u16 stype,
1075 struct ieee80211_mgmt *mgmt,
1076 size_t len,
1077 struct ieee80211_rx_status *rx_status)
1078{
Johannes Bergc6a1fa12008-10-07 12:04:32 +02001079 struct ieee80211_local *local = sdata->local;
Javier Cardonadbf498f2012-03-31 11:31:32 -07001080 struct ieee80211_if_mesh *ifmsh = &sdata->u.mesh;
Johannes Berg472dbc42008-09-11 00:01:49 +02001081 struct ieee802_11_elems elems;
1082 struct ieee80211_channel *channel;
Johannes Berg472dbc42008-09-11 00:01:49 +02001083 size_t baselen;
1084 int freq;
1085 enum ieee80211_band band = rx_status->band;
1086
1087 /* ignore ProbeResp to foreign address */
1088 if (stype == IEEE80211_STYPE_PROBE_RESP &&
Joe Perchesb203ca32012-05-08 18:56:52 +00001089 !ether_addr_equal(mgmt->da, sdata->vif.addr))
Johannes Berg472dbc42008-09-11 00:01:49 +02001090 return;
1091
1092 baselen = (u8 *) mgmt->u.probe_resp.variable - (u8 *) mgmt;
1093 if (baselen > len)
1094 return;
1095
1096 ieee802_11_parse_elems(mgmt->u.probe_resp.variable, len - baselen,
Johannes Bergb2e506b2013-03-26 14:54:16 +01001097 false, &elems);
Johannes Berg472dbc42008-09-11 00:01:49 +02001098
Thomas Pedersen9a90bc82012-10-20 19:03:10 -07001099 /* ignore non-mesh or secure / unsecure mismatch */
1100 if ((!elems.mesh_id || !elems.mesh_config) ||
1101 (elems.rsn && sdata->u.mesh.security == IEEE80211_MESH_SEC_NONE) ||
1102 (!elems.rsn && sdata->u.mesh.security != IEEE80211_MESH_SEC_NONE))
Javier Cardona5cff5e02011-04-07 15:08:29 -07001103 return;
1104
Johannes Berg1cd8e882013-03-27 14:30:12 +01001105 if (elems.ds_params)
Bruno Randolf59eb21a2011-01-17 13:37:28 +09001106 freq = ieee80211_channel_to_frequency(elems.ds_params[0], band);
Johannes Berg472dbc42008-09-11 00:01:49 +02001107 else
1108 freq = rx_status->freq;
1109
1110 channel = ieee80211_get_channel(local->hw.wiphy, freq);
1111
1112 if (!channel || channel->flags & IEEE80211_CHAN_DISABLED)
1113 return;
1114
Thomas Pedersen9a90bc82012-10-20 19:03:10 -07001115 if (mesh_matches_local(sdata, &elems))
Thomas Pedersenf743ff42012-04-18 19:23:43 -07001116 mesh_neighbour_update(sdata, mgmt->sa, &elems);
Javier Cardonadbf498f2012-03-31 11:31:32 -07001117
1118 if (ifmsh->sync_ops)
1119 ifmsh->sync_ops->rx_bcn_presp(sdata,
1120 stype, mgmt, &elems, rx_status);
Chun-Yeow Yeoh33a45862013-10-17 15:55:18 -07001121
Luciano Coelho0cb4d4d2014-01-13 19:42:58 +02001122 if (ifmsh->csa_role != IEEE80211_MESH_CSA_ROLE_INIT &&
1123 !sdata->vif.csa_active)
Chun-Yeow Yeoh33a45862013-10-17 15:55:18 -07001124 ieee80211_mesh_process_chnswitch(sdata, &elems, true);
Johannes Berg472dbc42008-09-11 00:01:49 +02001125}
1126
Chun-Yeow Yeohb8456a12013-10-17 15:55:02 -07001127int ieee80211_mesh_finish_csa(struct ieee80211_sub_if_data *sdata)
1128{
1129 struct ieee80211_if_mesh *ifmsh = &sdata->u.mesh;
1130 struct mesh_csa_settings *tmp_csa_settings;
1131 int ret = 0;
Michal Kaziorfaf046e2014-01-29 07:56:17 +01001132 int changed = 0;
Chun-Yeow Yeohb8456a12013-10-17 15:55:02 -07001133
1134 /* Reset the TTL value and Initiator flag */
Luciano Coelho0cb4d4d2014-01-13 19:42:58 +02001135 ifmsh->csa_role = IEEE80211_MESH_CSA_ROLE_NONE;
Chun-Yeow Yeohb8456a12013-10-17 15:55:02 -07001136 ifmsh->chsw_ttl = 0;
1137
1138 /* Remove the CSA and MCSP elements from the beacon */
1139 tmp_csa_settings = rcu_dereference(ifmsh->csa);
Monam Agarwal0c2bef462014-03-24 00:51:43 +05301140 RCU_INIT_POINTER(ifmsh->csa, NULL);
Luciano Coelho66e01cf2014-01-13 19:43:00 +02001141 if (tmp_csa_settings)
1142 kfree_rcu(tmp_csa_settings, rcu_head);
Chun-Yeow Yeohb8456a12013-10-17 15:55:02 -07001143 ret = ieee80211_mesh_rebuild_beacon(sdata);
1144 if (ret)
1145 return -EINVAL;
1146
Michal Kaziorfaf046e2014-01-29 07:56:17 +01001147 changed |= BSS_CHANGED_BEACON;
Chun-Yeow Yeohb8456a12013-10-17 15:55:02 -07001148
1149 mcsa_dbg(sdata, "complete switching to center freq %d MHz",
1150 sdata->vif.bss_conf.chandef.chan->center_freq);
Michal Kaziorfaf046e2014-01-29 07:56:17 +01001151 return changed;
Chun-Yeow Yeohb8456a12013-10-17 15:55:02 -07001152}
1153
1154int ieee80211_mesh_csa_beacon(struct ieee80211_sub_if_data *sdata,
Luciano Coelho66e01cf2014-01-13 19:43:00 +02001155 struct cfg80211_csa_settings *csa_settings)
Chun-Yeow Yeohb8456a12013-10-17 15:55:02 -07001156{
1157 struct ieee80211_if_mesh *ifmsh = &sdata->u.mesh;
1158 struct mesh_csa_settings *tmp_csa_settings;
1159 int ret = 0;
1160
1161 tmp_csa_settings = kmalloc(sizeof(*tmp_csa_settings),
1162 GFP_ATOMIC);
1163 if (!tmp_csa_settings)
1164 return -ENOMEM;
1165
1166 memcpy(&tmp_csa_settings->settings, csa_settings,
1167 sizeof(struct cfg80211_csa_settings));
1168
1169 rcu_assign_pointer(ifmsh->csa, tmp_csa_settings);
1170
1171 ret = ieee80211_mesh_rebuild_beacon(sdata);
1172 if (ret) {
1173 tmp_csa_settings = rcu_dereference(ifmsh->csa);
Monam Agarwal0c2bef462014-03-24 00:51:43 +05301174 RCU_INIT_POINTER(ifmsh->csa, NULL);
Chun-Yeow Yeohb8456a12013-10-17 15:55:02 -07001175 kfree_rcu(tmp_csa_settings, rcu_head);
1176 return ret;
1177 }
1178
Luciano Coelhob58e81e2014-01-13 19:42:59 +02001179 return BSS_CHANGED_BEACON;
Chun-Yeow Yeohb8456a12013-10-17 15:55:02 -07001180}
1181
Chun-Yeow Yeoh8f2535b2013-10-14 19:08:27 -07001182static int mesh_fwd_csa_frame(struct ieee80211_sub_if_data *sdata,
1183 struct ieee80211_mgmt *mgmt, size_t len)
1184{
1185 struct ieee80211_mgmt *mgmt_fwd;
1186 struct sk_buff *skb;
1187 struct ieee80211_local *local = sdata->local;
1188 u8 *pos = mgmt->u.action.u.chan_switch.variable;
1189 size_t offset_ttl;
1190
1191 skb = dev_alloc_skb(local->tx_headroom + len);
1192 if (!skb)
1193 return -ENOMEM;
1194 skb_reserve(skb, local->tx_headroom);
1195 mgmt_fwd = (struct ieee80211_mgmt *) skb_put(skb, len);
1196
1197 /* offset_ttl is based on whether the secondary channel
Antonio Ospiteb314c662014-06-04 14:03:49 +02001198 * offset is available or not. Subtract 1 from the mesh TTL
Chun-Yeow Yeoh8f2535b2013-10-14 19:08:27 -07001199 * and disable the initiator flag before forwarding.
1200 */
1201 offset_ttl = (len < 42) ? 7 : 10;
1202 *(pos + offset_ttl) -= 1;
1203 *(pos + offset_ttl + 1) &= ~WLAN_EID_CHAN_SWITCH_PARAM_INITIATOR;
1204
1205 memcpy(mgmt_fwd, mgmt, len);
1206 eth_broadcast_addr(mgmt_fwd->da);
1207 memcpy(mgmt_fwd->sa, sdata->vif.addr, ETH_ALEN);
1208 memcpy(mgmt_fwd->bssid, sdata->vif.addr, ETH_ALEN);
1209
1210 ieee80211_tx_skb(sdata, skb);
1211 return 0;
1212}
1213
1214static void mesh_rx_csa_frame(struct ieee80211_sub_if_data *sdata,
1215 struct ieee80211_mgmt *mgmt, size_t len)
1216{
1217 struct ieee80211_if_mesh *ifmsh = &sdata->u.mesh;
1218 struct ieee802_11_elems elems;
1219 u16 pre_value;
Chun-Yeow Yeoh33a45862013-10-17 15:55:18 -07001220 bool fwd_csa = true;
Chun-Yeow Yeoh8f2535b2013-10-14 19:08:27 -07001221 size_t baselen;
Chun-Yeow Yeoh3f718fd2013-11-08 15:09:43 +08001222 u8 *pos;
Chun-Yeow Yeoh8f2535b2013-10-14 19:08:27 -07001223
1224 if (mgmt->u.action.u.measurement.action_code !=
1225 WLAN_ACTION_SPCT_CHL_SWITCH)
1226 return;
1227
1228 pos = mgmt->u.action.u.chan_switch.variable;
1229 baselen = offsetof(struct ieee80211_mgmt,
1230 u.action.u.chan_switch.variable);
1231 ieee802_11_parse_elems(pos, len - baselen, false, &elems);
1232
Chun-Yeow Yeoh3f718fd2013-11-08 15:09:43 +08001233 ifmsh->chsw_ttl = elems.mesh_chansw_params_ie->mesh_ttl;
1234 if (!--ifmsh->chsw_ttl)
Chun-Yeow Yeoh8f2535b2013-10-14 19:08:27 -07001235 fwd_csa = false;
1236
1237 pre_value = le16_to_cpu(elems.mesh_chansw_params_ie->mesh_pre_value);
1238 if (ifmsh->pre_value >= pre_value)
1239 return;
1240
1241 ifmsh->pre_value = pre_value;
1242
Luciano Coelho0cb4d4d2014-01-13 19:42:58 +02001243 if (!sdata->vif.csa_active &&
1244 !ieee80211_mesh_process_chnswitch(sdata, &elems, false)) {
Chun-Yeow Yeoh33a45862013-10-17 15:55:18 -07001245 mcsa_dbg(sdata, "Failed to process CSA action frame");
1246 return;
1247 }
1248
Chun-Yeow Yeoh8f2535b2013-10-14 19:08:27 -07001249 /* forward or re-broadcast the CSA frame */
1250 if (fwd_csa) {
1251 if (mesh_fwd_csa_frame(sdata, mgmt, len) < 0)
1252 mcsa_dbg(sdata, "Failed to forward the CSA frame");
1253 }
Chun-Yeow Yeoh8f2535b2013-10-14 19:08:27 -07001254}
1255
Johannes Berg472dbc42008-09-11 00:01:49 +02001256static void ieee80211_mesh_rx_mgmt_action(struct ieee80211_sub_if_data *sdata,
1257 struct ieee80211_mgmt *mgmt,
1258 size_t len,
1259 struct ieee80211_rx_status *rx_status)
1260{
1261 switch (mgmt->u.action.category) {
Thomas Pedersen8db09852011-08-12 20:01:00 -07001262 case WLAN_CATEGORY_SELF_PROTECTED:
1263 switch (mgmt->u.action.u.self_prot.action_code) {
1264 case WLAN_SP_MESH_PEERING_OPEN:
1265 case WLAN_SP_MESH_PEERING_CLOSE:
1266 case WLAN_SP_MESH_PEERING_CONFIRM:
1267 mesh_rx_plink_frame(sdata, mgmt, len, rx_status);
1268 break;
1269 }
Johannes Berg472dbc42008-09-11 00:01:49 +02001270 break;
Thomas Pedersen25d49e42011-08-11 19:35:15 -07001271 case WLAN_CATEGORY_MESH_ACTION:
1272 if (mesh_action_is_path_sel(mgmt))
1273 mesh_rx_path_sel_frame(sdata, mgmt, len);
Johannes Berg472dbc42008-09-11 00:01:49 +02001274 break;
Chun-Yeow Yeoh8f2535b2013-10-14 19:08:27 -07001275 case WLAN_CATEGORY_SPECTRUM_MGMT:
1276 mesh_rx_csa_frame(sdata, mgmt, len);
1277 break;
Johannes Berg472dbc42008-09-11 00:01:49 +02001278 }
1279}
1280
Johannes Berg1fa57d02010-06-10 10:21:32 +02001281void ieee80211_mesh_rx_queued_mgmt(struct ieee80211_sub_if_data *sdata,
1282 struct sk_buff *skb)
Johannes Berg472dbc42008-09-11 00:01:49 +02001283{
1284 struct ieee80211_rx_status *rx_status;
Johannes Berg472dbc42008-09-11 00:01:49 +02001285 struct ieee80211_mgmt *mgmt;
1286 u16 stype;
1287
Thomas Pedersenecccd072013-06-10 13:17:21 -07001288 sdata_lock(sdata);
1289
1290 /* mesh already went down */
Johannes Berg1693d342014-01-22 10:08:57 +01001291 if (!sdata->u.mesh.mesh_id_len)
Thomas Pedersenecccd072013-06-10 13:17:21 -07001292 goto out;
1293
Johannes Bergf1d58c22009-06-17 13:13:00 +02001294 rx_status = IEEE80211_SKB_RXCB(skb);
Johannes Berg472dbc42008-09-11 00:01:49 +02001295 mgmt = (struct ieee80211_mgmt *) skb->data;
1296 stype = le16_to_cpu(mgmt->frame_control) & IEEE80211_FCTL_STYPE;
1297
1298 switch (stype) {
1299 case IEEE80211_STYPE_PROBE_RESP:
1300 case IEEE80211_STYPE_BEACON:
1301 ieee80211_mesh_rx_bcn_presp(sdata, stype, mgmt, skb->len,
1302 rx_status);
1303 break;
Thomas Pedersen9fb04b52013-02-14 11:20:14 -08001304 case IEEE80211_STYPE_PROBE_REQ:
1305 ieee80211_mesh_rx_probe_req(sdata, mgmt, skb->len);
1306 break;
Johannes Berg472dbc42008-09-11 00:01:49 +02001307 case IEEE80211_STYPE_ACTION:
1308 ieee80211_mesh_rx_mgmt_action(sdata, mgmt, skb->len, rx_status);
1309 break;
1310 }
Thomas Pedersenecccd072013-06-10 13:17:21 -07001311out:
1312 sdata_unlock(sdata);
Johannes Berg472dbc42008-09-11 00:01:49 +02001313}
1314
Thomas Pedersenf81a9de2013-06-13 15:54:41 -07001315static void mesh_bss_info_changed(struct ieee80211_sub_if_data *sdata)
1316{
1317 struct ieee80211_if_mesh *ifmsh = &sdata->u.mesh;
1318 u32 bit, changed = 0;
1319
1320 for_each_set_bit(bit, &ifmsh->mbss_changed,
1321 sizeof(changed) * BITS_PER_BYTE) {
1322 clear_bit(bit, &ifmsh->mbss_changed);
1323 changed |= BIT(bit);
1324 }
1325
1326 if (sdata->vif.bss_conf.enable_beacon &&
1327 (changed & (BSS_CHANGED_BEACON |
1328 BSS_CHANGED_HT |
1329 BSS_CHANGED_BASIC_RATES |
1330 BSS_CHANGED_BEACON_INT)))
1331 if (ieee80211_mesh_rebuild_beacon(sdata))
1332 return;
1333
1334 ieee80211_bss_info_change_notify(sdata, changed);
1335}
1336
Johannes Berg1fa57d02010-06-10 10:21:32 +02001337void ieee80211_mesh_work(struct ieee80211_sub_if_data *sdata)
Johannes Berg472dbc42008-09-11 00:01:49 +02001338{
Johannes Berg472dbc42008-09-11 00:01:49 +02001339 struct ieee80211_if_mesh *ifmsh = &sdata->u.mesh;
Johannes Berg472dbc42008-09-11 00:01:49 +02001340
Thomas Pedersenecccd072013-06-10 13:17:21 -07001341 sdata_lock(sdata);
1342
1343 /* mesh already went down */
Johannes Berg1693d342014-01-22 10:08:57 +01001344 if (!sdata->u.mesh.mesh_id_len)
Thomas Pedersenecccd072013-06-10 13:17:21 -07001345 goto out;
1346
Johannes Berg472dbc42008-09-11 00:01:49 +02001347 if (ifmsh->preq_queue_len &&
1348 time_after(jiffies,
1349 ifmsh->last_preq + msecs_to_jiffies(ifmsh->mshcfg.dot11MeshHWMPpreqMinInterval)))
1350 mesh_path_start_discovery(sdata);
1351
Javier Cardona18889232009-08-10 12:15:52 -07001352 if (test_and_clear_bit(MESH_WORK_GROW_MPATH_TABLE, &ifmsh->wrkq_flags))
1353 mesh_mpath_table_grow();
1354
Nick Ledovskikhdcac9082011-01-11 14:35:12 +00001355 if (test_and_clear_bit(MESH_WORK_GROW_MPP_TABLE, &ifmsh->wrkq_flags))
Javier Cardona18889232009-08-10 12:15:52 -07001356 mesh_mpp_table_grow();
1357
1358 if (test_and_clear_bit(MESH_WORK_HOUSEKEEPING, &ifmsh->wrkq_flags))
Johannes Bergbf7cd942013-02-15 14:40:31 +01001359 ieee80211_mesh_housekeeping(sdata);
Rui Pauloe304bfd2009-11-09 23:46:56 +00001360
1361 if (test_and_clear_bit(MESH_WORK_ROOT, &ifmsh->wrkq_flags))
1362 ieee80211_mesh_rootpath(sdata);
Javier Cardonadbf498f2012-03-31 11:31:32 -07001363
1364 if (test_and_clear_bit(MESH_WORK_DRIFT_ADJUST, &ifmsh->wrkq_flags))
1365 mesh_sync_adjust_tbtt(sdata);
Thomas Pedersenecccd072013-06-10 13:17:21 -07001366
Thomas Pedersenf81a9de2013-06-13 15:54:41 -07001367 if (test_and_clear_bit(MESH_WORK_MBSS_CHANGED, &ifmsh->wrkq_flags))
1368 mesh_bss_info_changed(sdata);
Thomas Pedersenecccd072013-06-10 13:17:21 -07001369out:
1370 sdata_unlock(sdata);
Johannes Berg472dbc42008-09-11 00:01:49 +02001371}
1372
1373void ieee80211_mesh_notify_scan_completed(struct ieee80211_local *local)
1374{
1375 struct ieee80211_sub_if_data *sdata;
1376
1377 rcu_read_lock();
1378 list_for_each_entry_rcu(sdata, &local->interfaces, list)
Ben Greear370bd002013-03-19 17:50:50 -07001379 if (ieee80211_vif_is_mesh(&sdata->vif) &&
1380 ieee80211_sdata_running(sdata))
Johannes Berg64592c82010-06-10 10:21:31 +02001381 ieee80211_queue_work(&local->hw, &sdata->work);
Johannes Berg472dbc42008-09-11 00:01:49 +02001382 rcu_read_unlock();
1383}
1384
Johannes Berg902acc72008-02-23 15:17:19 +01001385void ieee80211_mesh_init_sdata(struct ieee80211_sub_if_data *sdata)
1386{
Johannes Berg472dbc42008-09-11 00:01:49 +02001387 struct ieee80211_if_mesh *ifmsh = &sdata->u.mesh;
Johannes Bergad2d2232012-12-14 14:34:25 +01001388 static u8 zero_addr[ETH_ALEN] = {};
Johannes Berg902acc72008-02-23 15:17:19 +01001389
Johannes Berg472dbc42008-09-11 00:01:49 +02001390 setup_timer(&ifmsh->housekeeping_timer,
1391 ieee80211_mesh_housekeeping_timer,
1392 (unsigned long) sdata);
Johannes Berg472dbc42008-09-11 00:01:49 +02001393
Johannes Berg472dbc42008-09-11 00:01:49 +02001394 ifmsh->accepting_plinks = true;
Johannes Berg472dbc42008-09-11 00:01:49 +02001395 atomic_set(&ifmsh->mpaths, 0);
Jasper Bryant-Greenef698d852008-08-03 12:04:37 +12001396 mesh_rmc_init(sdata);
Johannes Berg472dbc42008-09-11 00:01:49 +02001397 ifmsh->last_preq = jiffies;
Thomas Pedersendca7e942011-11-24 17:15:24 -08001398 ifmsh->next_perr = jiffies;
Luciano Coelho0cb4d4d2014-01-13 19:42:58 +02001399 ifmsh->csa_role = IEEE80211_MESH_CSA_ROLE_NONE;
Johannes Berg902acc72008-02-23 15:17:19 +01001400 /* Allocate all mesh structures when creating the first mesh interface. */
1401 if (!mesh_allocated)
1402 ieee80211s_init();
Johannes Berg472dbc42008-09-11 00:01:49 +02001403 setup_timer(&ifmsh->mesh_path_timer,
Johannes Berg902acc72008-02-23 15:17:19 +01001404 ieee80211_mesh_path_timer,
1405 (unsigned long) sdata);
Rui Pauloe304bfd2009-11-09 23:46:56 +00001406 setup_timer(&ifmsh->mesh_path_root_timer,
1407 ieee80211_mesh_path_root_timer,
1408 (unsigned long) sdata);
Johannes Berg472dbc42008-09-11 00:01:49 +02001409 INIT_LIST_HEAD(&ifmsh->preq_queue.list);
Marco Porsch3f52b7e2013-01-30 18:14:08 +01001410 skb_queue_head_init(&ifmsh->ps.bc_buf);
Johannes Berg472dbc42008-09-11 00:01:49 +02001411 spin_lock_init(&ifmsh->mesh_preq_queue_lock);
Javier Cardonadbf498f2012-03-31 11:31:32 -07001412 spin_lock_init(&ifmsh->sync_offset_lock);
Thomas Pedersen2b5e1962013-02-14 11:20:13 -08001413 RCU_INIT_POINTER(ifmsh->beacon, NULL);
Johannes Bergad2d2232012-12-14 14:34:25 +01001414
1415 sdata->vif.bss_conf.bssid = zero_addr;
Johannes Berg472dbc42008-09-11 00:01:49 +02001416}