blob: 3d6b3d674ca33edb62274245752db65b3b9d648e [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"
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{
Luis Carlos Cobo2e3c8732008-02-23 15:17:09 +010028 mesh_allocated = 1;
29 rm_cache = kmem_cache_create("mesh_rmc", sizeof(struct rmc_entry),
30 0, 0, NULL);
31}
32
33void ieee80211s_stop(void)
34{
Johannes Bergbf7cd942013-02-15 14:40:31 +010035 if (!mesh_allocated)
36 return;
Luis Carlos Cobo2e3c8732008-02-23 15:17:09 +010037 kmem_cache_destroy(rm_cache);
38}
39
Johannes Berg472dbc42008-09-11 00:01:49 +020040static void ieee80211_mesh_housekeeping_timer(unsigned long data)
41{
42 struct ieee80211_sub_if_data *sdata = (void *) data;
43 struct ieee80211_local *local = sdata->local;
44 struct ieee80211_if_mesh *ifmsh = &sdata->u.mesh;
45
Rui Paulo6b9ac442009-10-20 21:21:48 +010046 set_bit(MESH_WORK_HOUSEKEEPING, &ifmsh->wrkq_flags);
Johannes Berg5bb644a2009-05-17 11:40:42 +020047
Johannes Berg64592c82010-06-10 10:21:31 +020048 ieee80211_queue_work(&local->hw, &sdata->work);
Johannes Berg472dbc42008-09-11 00:01:49 +020049}
50
Luis Carlos Cobo2e3c8732008-02-23 15:17:09 +010051/**
52 * mesh_matches_local - check if the config of a mesh point matches ours
53 *
Jasper Bryant-Greenef698d852008-08-03 12:04:37 +120054 * @sdata: local mesh subif
Thomas Pedersenf743ff42012-04-18 19:23:43 -070055 * @ie: information elements of a management frame from the mesh peer
Luis Carlos Cobo2e3c8732008-02-23 15:17:09 +010056 *
57 * This function checks if the mesh configuration of a mesh point matches the
58 * local mesh configuration, i.e. if both nodes belong to the same mesh network.
59 */
Thomas Pedersenf743ff42012-04-18 19:23:43 -070060bool mesh_matches_local(struct ieee80211_sub_if_data *sdata,
61 struct ieee802_11_elems *ie)
Luis Carlos Cobo2e3c8732008-02-23 15:17:09 +010062{
Johannes Berg472dbc42008-09-11 00:01:49 +020063 struct ieee80211_if_mesh *ifmsh = &sdata->u.mesh;
Thomas Pedersenf743ff42012-04-18 19:23:43 -070064 u32 basic_rates = 0;
Johannes Berg4bf88532012-11-09 11:39:59 +010065 struct cfg80211_chan_def sta_chan_def;
Mohammed Shafi Shajakhan21a8e9d2017-04-27 12:45:38 +053066 struct ieee80211_supported_band *sband;
Luis Carlos Cobo2e3c8732008-02-23 15:17:09 +010067
Luis Carlos Cobo2e3c8732008-02-23 15:17:09 +010068 /*
69 * As support for each feature is added, check for matching
70 * - On mesh config capabilities
71 * - Power Save Support En
72 * - Sync support enabled
73 * - Sync support active
74 * - Sync support required from peer
75 * - MDA enabled
76 * - Power management control on fc
77 */
Thomas Pedersen739522b2011-10-26 14:47:28 -070078 if (!(ifmsh->mesh_id_len == ie->mesh_id_len &&
79 memcmp(ifmsh->mesh_id, ie->mesh_id, ie->mesh_id_len) == 0 &&
80 (ifmsh->mesh_pp_id == ie->mesh_config->meshconf_psel) &&
81 (ifmsh->mesh_pm_id == ie->mesh_config->meshconf_pmetric) &&
82 (ifmsh->mesh_cc_id == ie->mesh_config->meshconf_congest) &&
83 (ifmsh->mesh_sp_id == ie->mesh_config->meshconf_synch) &&
84 (ifmsh->mesh_auth_id == ie->mesh_config->meshconf_auth)))
Johannes Bergbf7cd942013-02-15 14:40:31 +010085 return false;
Luis Carlos Cobo2e3c8732008-02-23 15:17:09 +010086
Mohammed Shafi Shajakhan21a8e9d2017-04-27 12:45:38 +053087 sband = ieee80211_get_sband(sdata);
88 if (!sband)
89 return false;
90
91 ieee80211_sta_get_rates(sdata, ie, sband->band,
Thomas Pedersenf743ff42012-04-18 19:23:43 -070092 &basic_rates);
93
Ashok Nagarajanfe40cb62012-04-02 21:21:22 -070094 if (sdata->vif.bss_conf.basic_rates != basic_rates)
Johannes Bergbf7cd942013-02-15 14:40:31 +010095 return false;
Ashok Nagarajanfe40cb62012-04-02 21:21:22 -070096
Johannes Berg8ac3c7042015-12-18 15:08:34 +010097 cfg80211_chandef_create(&sta_chan_def, sdata->vif.bss_conf.chandef.chan,
98 NL80211_CHAN_NO_HT);
99 ieee80211_chandef_ht_oper(ie->ht_operation, &sta_chan_def);
100 ieee80211_chandef_vht_oper(ie->vht_operation, &sta_chan_def);
Bob Copelandc85fb532015-08-27 09:00:18 -0400101
Johannes Berg4bf88532012-11-09 11:39:59 +0100102 if (!cfg80211_chandef_compatible(&sdata->vif.bss_conf.chandef,
103 &sta_chan_def))
Johannes Bergbf7cd942013-02-15 14:40:31 +0100104 return false;
Thomas Pedersen739522b2011-10-26 14:47:28 -0700105
106 return true;
Luis Carlos Cobo2e3c8732008-02-23 15:17:09 +0100107}
108
109/**
110 * mesh_peer_accepts_plinks - check if an mp is willing to establish peer links
111 *
112 * @ie: information elements of a management frame from the mesh peer
Luis Carlos Cobo2e3c8732008-02-23 15:17:09 +0100113 */
Jasper Bryant-Greenef698d852008-08-03 12:04:37 +1200114bool mesh_peer_accepts_plinks(struct ieee802_11_elems *ie)
Luis Carlos Cobo2e3c8732008-02-23 15:17:09 +0100115{
Rui Paulo136cfa22009-11-18 18:40:00 +0000116 return (ie->mesh_config->meshconf_cap &
Johannes Bergbf7cd942013-02-15 14:40:31 +0100117 IEEE80211_MESHCONF_CAPAB_ACCEPT_PLINKS) != 0;
Luis Carlos Cobo2e3c8732008-02-23 15:17:09 +0100118}
119
120/**
Ben Hutchings2c530402012-07-10 10:55:09 +0000121 * mesh_accept_plinks_update - update accepting_plink in local mesh beacons
Luis Carlos Cobo2e3c8732008-02-23 15:17:09 +0100122 *
Johannes Bergd0709a62008-02-25 16:27:46 +0100123 * @sdata: mesh interface in which mesh beacons are going to be updated
Marco Porschdf323812012-08-08 07:58:43 +0200124 *
125 * Returns: beacon changed flag if the beacon content changed.
Luis Carlos Cobo2e3c8732008-02-23 15:17:09 +0100126 */
Marco Porschdf323812012-08-08 07:58:43 +0200127u32 mesh_accept_plinks_update(struct ieee80211_sub_if_data *sdata)
Luis Carlos Cobo2e3c8732008-02-23 15:17:09 +0100128{
Luis Carlos Cobo2e3c8732008-02-23 15:17:09 +0100129 bool free_plinks;
Marco Porschdf323812012-08-08 07:58:43 +0200130 u32 changed = 0;
Luis Carlos Cobo2e3c8732008-02-23 15:17:09 +0100131
132 /* In case mesh_plink_free_count > 0 and mesh_plinktbl_capacity == 0,
133 * the mesh interface might be able to establish plinks with peers that
Luis Carlos Cobob4e08ea2008-02-29 15:46:08 -0800134 * are already on the table but are not on PLINK_ESTAB state. However,
135 * in general the mesh interface is not accepting peer link requests
136 * from new peers, and that must be reflected in the beacon
Luis Carlos Cobo2e3c8732008-02-23 15:17:09 +0100137 */
138 free_plinks = mesh_plink_availables(sdata);
139
Marco Porschdf323812012-08-08 07:58:43 +0200140 if (free_plinks != sdata->u.mesh.accepting_plinks) {
141 sdata->u.mesh.accepting_plinks = free_plinks;
142 changed = BSS_CHANGED_BEACON;
143 }
144
145 return changed;
Luis Carlos Cobo2e3c8732008-02-23 15:17:09 +0100146}
147
Thomas Pedersen45b50282013-02-06 10:17:21 -0800148/*
149 * mesh_sta_cleanup - clean up any mesh sta state
150 *
151 * @sta: mesh sta to clean up.
152 */
153void mesh_sta_cleanup(struct sta_info *sta)
154{
155 struct ieee80211_sub_if_data *sdata = sta->sdata;
Bob Copelandefc401f2016-06-25 19:14:16 -0400156 u32 changed = mesh_plink_deactivate(sta);
Bob Copelandfe7a7c52016-05-15 13:19:16 -0400157
Thomas Pedersenf81a9de2013-06-13 15:54:41 -0700158 if (changed)
Thomas Pedersen2b5e1962013-02-14 11:20:13 -0800159 ieee80211_mbss_info_change_notify(sdata, changed);
Thomas Pedersen45b50282013-02-06 10:17:21 -0800160}
161
Jasper Bryant-Greenef698d852008-08-03 12:04:37 +1200162int mesh_rmc_init(struct ieee80211_sub_if_data *sdata)
Luis Carlos Cobo2e3c8732008-02-23 15:17:09 +0100163{
Luis Carlos Cobo2e3c8732008-02-23 15:17:09 +0100164 int i;
165
Johannes Berg472dbc42008-09-11 00:01:49 +0200166 sdata->u.mesh.rmc = kmalloc(sizeof(struct mesh_rmc), GFP_KERNEL);
167 if (!sdata->u.mesh.rmc)
Luis Carlos Cobo2e3c8732008-02-23 15:17:09 +0100168 return -ENOMEM;
Johannes Berg472dbc42008-09-11 00:01:49 +0200169 sdata->u.mesh.rmc->idx_mask = RMC_BUCKETS - 1;
Luis Carlos Cobo2e3c8732008-02-23 15:17:09 +0100170 for (i = 0; i < RMC_BUCKETS; i++)
Bob Copeland47a04892016-03-18 22:11:29 -0400171 INIT_HLIST_HEAD(&sdata->u.mesh.rmc->bucket[i]);
Luis Carlos Cobo2e3c8732008-02-23 15:17:09 +0100172 return 0;
173}
174
Jasper Bryant-Greenef698d852008-08-03 12:04:37 +1200175void mesh_rmc_free(struct ieee80211_sub_if_data *sdata)
Luis Carlos Cobo2e3c8732008-02-23 15:17:09 +0100176{
Johannes Berg472dbc42008-09-11 00:01:49 +0200177 struct mesh_rmc *rmc = sdata->u.mesh.rmc;
Bob Copeland47a04892016-03-18 22:11:29 -0400178 struct rmc_entry *p;
179 struct hlist_node *n;
Luis Carlos Cobo2e3c8732008-02-23 15:17:09 +0100180 int i;
181
Johannes Berg472dbc42008-09-11 00:01:49 +0200182 if (!sdata->u.mesh.rmc)
Luis Carlos Cobo2e3c8732008-02-23 15:17:09 +0100183 return;
184
Johannes Bergbf7cd942013-02-15 14:40:31 +0100185 for (i = 0; i < RMC_BUCKETS; i++) {
Bob Copeland47a04892016-03-18 22:11:29 -0400186 hlist_for_each_entry_safe(p, n, &rmc->bucket[i], list) {
187 hlist_del(&p->list);
Luis Carlos Cobo2e3c8732008-02-23 15:17:09 +0100188 kmem_cache_free(rm_cache, p);
189 }
Johannes Bergbf7cd942013-02-15 14:40:31 +0100190 }
Luis Carlos Cobo2e3c8732008-02-23 15:17:09 +0100191
192 kfree(rmc);
Johannes Berg472dbc42008-09-11 00:01:49 +0200193 sdata->u.mesh.rmc = NULL;
Luis Carlos Cobo2e3c8732008-02-23 15:17:09 +0100194}
195
196/**
197 * mesh_rmc_check - Check frame in recent multicast cache and add if absent.
198 *
Johannes Bergbf7cd942013-02-15 14:40:31 +0100199 * @sdata: interface
Luis Carlos Cobo2e3c8732008-02-23 15:17:09 +0100200 * @sa: source address
201 * @mesh_hdr: mesh_header
202 *
203 * Returns: 0 if the frame is not in the cache, nonzero otherwise.
204 *
205 * Checks using the source address and the mesh sequence number if we have
206 * received this frame lately. If the frame is not in the cache, it is added to
207 * it.
208 */
Johannes Bergbf7cd942013-02-15 14:40:31 +0100209int mesh_rmc_check(struct ieee80211_sub_if_data *sdata,
210 const u8 *sa, struct ieee80211s_hdr *mesh_hdr)
Luis Carlos Cobo2e3c8732008-02-23 15:17:09 +0100211{
Johannes Berg472dbc42008-09-11 00:01:49 +0200212 struct mesh_rmc *rmc = sdata->u.mesh.rmc;
Luis Carlos Cobo2e3c8732008-02-23 15:17:09 +0100213 u32 seqnum = 0;
214 int entries = 0;
215 u8 idx;
Bob Copeland47a04892016-03-18 22:11:29 -0400216 struct rmc_entry *p;
217 struct hlist_node *n;
Luis Carlos Cobo2e3c8732008-02-23 15:17:09 +0100218
Bob Copeland0aa7fab2016-03-18 22:11:28 -0400219 if (!rmc)
220 return -1;
221
Luis Carlos Cobo2e3c8732008-02-23 15:17:09 +0100222 /* Don't care about endianness since only match matters */
Luis Carlos Cobo51cedda2008-04-23 12:15:29 -0700223 memcpy(&seqnum, &mesh_hdr->seqnum, sizeof(mesh_hdr->seqnum));
224 idx = le32_to_cpu(mesh_hdr->seqnum) & rmc->idx_mask;
Bob Copeland47a04892016-03-18 22:11:29 -0400225 hlist_for_each_entry_safe(p, n, &rmc->bucket[idx], list) {
Luis Carlos Cobo2e3c8732008-02-23 15:17:09 +0100226 ++entries;
227 if (time_after(jiffies, p->exp_time) ||
Johannes Bergbf7cd942013-02-15 14:40:31 +0100228 entries == RMC_QUEUE_MAX_LEN) {
Bob Copeland47a04892016-03-18 22:11:29 -0400229 hlist_del(&p->list);
Luis Carlos Cobo2e3c8732008-02-23 15:17:09 +0100230 kmem_cache_free(rm_cache, p);
231 --entries;
Johannes Bergbf7cd942013-02-15 14:40:31 +0100232 } else if ((seqnum == p->seqnum) && ether_addr_equal(sa, p->sa))
Luis Carlos Cobo2e3c8732008-02-23 15:17:09 +0100233 return -1;
234 }
235
236 p = kmem_cache_alloc(rm_cache, GFP_ATOMIC);
Joe Perchesd15b8452011-08-29 14:17:31 -0700237 if (!p)
Luis Carlos Cobo2e3c8732008-02-23 15:17:09 +0100238 return 0;
Joe Perchesd15b8452011-08-29 14:17:31 -0700239
Luis Carlos Cobo2e3c8732008-02-23 15:17:09 +0100240 p->seqnum = seqnum;
241 p->exp_time = jiffies + RMC_TIMEOUT;
242 memcpy(p->sa, sa, ETH_ALEN);
Bob Copeland47a04892016-03-18 22:11:29 -0400243 hlist_add_head(&p->list, &rmc->bucket[idx]);
Luis Carlos Cobo2e3c8732008-02-23 15:17:09 +0100244 return 0;
245}
246
Johannes Bergbf7cd942013-02-15 14:40:31 +0100247int mesh_add_meshconf_ie(struct ieee80211_sub_if_data *sdata,
248 struct sk_buff *skb)
Thomas Pedersen082ebb02011-08-11 19:35:10 -0700249{
250 struct ieee80211_if_mesh *ifmsh = &sdata->u.mesh;
251 u8 *pos, neighbors;
252 u8 meshconf_len = sizeof(struct ieee80211_meshconf_ie);
253
254 if (skb_tailroom(skb) < 2 + meshconf_len)
255 return -ENOMEM;
256
257 pos = skb_put(skb, 2 + meshconf_len);
258 *pos++ = WLAN_EID_MESH_CONFIG;
259 *pos++ = meshconf_len;
260
Thomas Pedersen43552be2013-12-15 13:14:16 -0800261 /* save a pointer for quick updates in pre-tbtt */
262 ifmsh->meshconf_offset = pos - skb->data;
263
Thomas Pedersen082ebb02011-08-11 19:35:10 -0700264 /* Active path selection protocol ID */
265 *pos++ = ifmsh->mesh_pp_id;
266 /* Active path selection metric ID */
267 *pos++ = ifmsh->mesh_pm_id;
268 /* Congestion control mode identifier */
269 *pos++ = ifmsh->mesh_cc_id;
270 /* Synchronization protocol identifier */
271 *pos++ = ifmsh->mesh_sp_id;
272 /* Authentication Protocol identifier */
273 *pos++ = ifmsh->mesh_auth_id;
274 /* Mesh Formation Info - number of neighbors */
Ashok Nagarajan1258d972012-10-09 13:27:47 -0700275 neighbors = atomic_read(&ifmsh->estab_plinks);
Jacob Minshalle05eccc2013-05-29 14:32:36 -0700276 neighbors = min_t(int, neighbors, IEEE80211_MAX_MESH_PEERINGS);
Thomas Pedersen082ebb02011-08-11 19:35:10 -0700277 *pos++ = neighbors << 1;
278 /* Mesh capability */
Chun-Yeow Yeohb60e5272013-07-12 18:55:22 +0800279 *pos = 0x00;
280 *pos |= ifmsh->mshcfg.dot11MeshForwarding ?
281 IEEE80211_MESHCONF_CAPAB_FORWARDING : 0x00;
Javier Cardonadbf498f2012-03-31 11:31:32 -0700282 *pos |= ifmsh->accepting_plinks ?
Johannes Bergbf7cd942013-02-15 14:40:31 +0100283 IEEE80211_MESHCONF_CAPAB_ACCEPT_PLINKS : 0x00;
Marco Porsch3f52b7e2013-01-30 18:14:08 +0100284 /* Mesh PS mode. See IEEE802.11-2012 8.4.2.100.8 */
285 *pos |= ifmsh->ps_peers_deep_sleep ?
Johannes Bergbf7cd942013-02-15 14:40:31 +0100286 IEEE80211_MESHCONF_CAPAB_POWER_SAVE_LEVEL : 0x00;
Thomas Pedersen082ebb02011-08-11 19:35:10 -0700287 return 0;
288}
289
Johannes Bergbf7cd942013-02-15 14:40:31 +0100290int mesh_add_meshid_ie(struct ieee80211_sub_if_data *sdata, struct sk_buff *skb)
Thomas Pedersen082ebb02011-08-11 19:35:10 -0700291{
292 struct ieee80211_if_mesh *ifmsh = &sdata->u.mesh;
293 u8 *pos;
294
295 if (skb_tailroom(skb) < 2 + ifmsh->mesh_id_len)
296 return -ENOMEM;
297
298 pos = skb_put(skb, 2 + ifmsh->mesh_id_len);
299 *pos++ = WLAN_EID_MESH_ID;
300 *pos++ = ifmsh->mesh_id_len;
301 if (ifmsh->mesh_id_len)
302 memcpy(pos, ifmsh->mesh_id, ifmsh->mesh_id_len);
303
304 return 0;
305}
306
Johannes Bergbf7cd942013-02-15 14:40:31 +0100307static int mesh_add_awake_window_ie(struct ieee80211_sub_if_data *sdata,
308 struct sk_buff *skb)
Marco Porsch3f52b7e2013-01-30 18:14:08 +0100309{
310 struct ieee80211_if_mesh *ifmsh = &sdata->u.mesh;
311 u8 *pos;
312
313 /* see IEEE802.11-2012 13.14.6 */
314 if (ifmsh->ps_peers_light_sleep == 0 &&
315 ifmsh->ps_peers_deep_sleep == 0 &&
316 ifmsh->nonpeer_pm == NL80211_MESH_POWER_ACTIVE)
317 return 0;
318
319 if (skb_tailroom(skb) < 4)
320 return -ENOMEM;
321
322 pos = skb_put(skb, 2 + 2);
323 *pos++ = WLAN_EID_MESH_AWAKE_WINDOW;
324 *pos++ = 2;
325 put_unaligned_le16(ifmsh->mshcfg.dot11MeshAwakeWindowDuration, pos);
326
327 return 0;
328}
329
Johannes Bergbf7cd942013-02-15 14:40:31 +0100330int mesh_add_vendor_ies(struct ieee80211_sub_if_data *sdata,
331 struct sk_buff *skb)
Thomas Pedersen082ebb02011-08-11 19:35:10 -0700332{
333 struct ieee80211_if_mesh *ifmsh = &sdata->u.mesh;
334 u8 offset, len;
335 const u8 *data;
336
337 if (!ifmsh->ie || !ifmsh->ie_len)
338 return 0;
339
340 /* fast-forward to vendor IEs */
341 offset = ieee80211_ie_split_vendor(ifmsh->ie, ifmsh->ie_len, 0);
342
Thorsten Horstmannda7061c2017-02-03 14:38:29 +0100343 if (offset < ifmsh->ie_len) {
Thomas Pedersen082ebb02011-08-11 19:35:10 -0700344 len = ifmsh->ie_len - offset;
345 data = ifmsh->ie + offset;
346 if (skb_tailroom(skb) < len)
347 return -ENOMEM;
348 memcpy(skb_put(skb, len), data, len);
349 }
350
351 return 0;
352}
353
Johannes Bergbf7cd942013-02-15 14:40:31 +0100354int mesh_add_rsn_ie(struct ieee80211_sub_if_data *sdata, struct sk_buff *skb)
Thomas Pedersen082ebb02011-08-11 19:35:10 -0700355{
356 struct ieee80211_if_mesh *ifmsh = &sdata->u.mesh;
357 u8 len = 0;
358 const u8 *data;
359
360 if (!ifmsh->ie || !ifmsh->ie_len)
361 return 0;
362
363 /* find RSN IE */
Bob Copelanda40a8c12014-04-15 10:43:07 -0400364 data = cfg80211_find_ie(WLAN_EID_RSN, ifmsh->ie, ifmsh->ie_len);
365 if (!data)
366 return 0;
Thomas Pedersen082ebb02011-08-11 19:35:10 -0700367
Bob Copelanda40a8c12014-04-15 10:43:07 -0400368 len = data[1] + 2;
369
370 if (skb_tailroom(skb) < len)
371 return -ENOMEM;
372 memcpy(skb_put(skb, len), data, len);
Thomas Pedersen082ebb02011-08-11 19:35:10 -0700373
374 return 0;
375}
376
Johannes Bergbf7cd942013-02-15 14:40:31 +0100377static int mesh_add_ds_params_ie(struct ieee80211_sub_if_data *sdata,
378 struct sk_buff *skb)
Thomas Pedersen082ebb02011-08-11 19:35:10 -0700379{
Johannes Berg55de9082012-07-26 17:24:39 +0200380 struct ieee80211_chanctx_conf *chanctx_conf;
381 struct ieee80211_channel *chan;
Thomas Pedersen082ebb02011-08-11 19:35:10 -0700382 u8 *pos;
383
384 if (skb_tailroom(skb) < 3)
385 return -ENOMEM;
386
Johannes Berg55de9082012-07-26 17:24:39 +0200387 rcu_read_lock();
388 chanctx_conf = rcu_dereference(sdata->vif.chanctx_conf);
389 if (WARN_ON(!chanctx_conf)) {
390 rcu_read_unlock();
391 return -EINVAL;
392 }
Johannes Berg4bf88532012-11-09 11:39:59 +0100393 chan = chanctx_conf->def.chan;
Johannes Berg55de9082012-07-26 17:24:39 +0200394 rcu_read_unlock();
395
Emanuel Taube601513a2013-02-06 14:17:17 +0100396 pos = skb_put(skb, 2 + 1);
397 *pos++ = WLAN_EID_DS_PARAMS;
398 *pos++ = 1;
399 *pos++ = ieee80211_frequency_to_channel(chan->center_freq);
Rui Paulobe125c62009-11-09 23:46:54 +0000400
Thomas Pedersen082ebb02011-08-11 19:35:10 -0700401 return 0;
Luis Carlos Cobo2e3c8732008-02-23 15:17:09 +0100402}
403
Johannes Bergbf7cd942013-02-15 14:40:31 +0100404int mesh_add_ht_cap_ie(struct ieee80211_sub_if_data *sdata,
405 struct sk_buff *skb)
Thomas Pedersen176f3602011-10-26 14:47:27 -0700406{
Thomas Pedersen176f3602011-10-26 14:47:27 -0700407 struct ieee80211_supported_band *sband;
408 u8 *pos;
409
Mohammed Shafi Shajakhan21a8e9d2017-04-27 12:45:38 +0530410 sband = ieee80211_get_sband(sdata);
411 if (!sband)
412 return -EINVAL;
413
Thomas Pedersen176f3602011-10-26 14:47:27 -0700414 if (!sband->ht_cap.ht_supported ||
Simon Wunderlich0418a442013-05-16 13:00:31 +0200415 sdata->vif.bss_conf.chandef.width == NL80211_CHAN_WIDTH_20_NOHT ||
416 sdata->vif.bss_conf.chandef.width == NL80211_CHAN_WIDTH_5 ||
417 sdata->vif.bss_conf.chandef.width == NL80211_CHAN_WIDTH_10)
Thomas Pedersen176f3602011-10-26 14:47:27 -0700418 return 0;
419
420 if (skb_tailroom(skb) < 2 + sizeof(struct ieee80211_ht_cap))
421 return -ENOMEM;
422
423 pos = skb_put(skb, 2 + sizeof(struct ieee80211_ht_cap));
Ben Greearef96a8422011-11-18 11:32:00 -0800424 ieee80211_ie_build_ht_cap(pos, &sband->ht_cap, sband->ht_cap.cap);
Thomas Pedersen176f3602011-10-26 14:47:27 -0700425
426 return 0;
427}
428
Johannes Bergbf7cd942013-02-15 14:40:31 +0100429int mesh_add_ht_oper_ie(struct ieee80211_sub_if_data *sdata,
430 struct sk_buff *skb)
Thomas Pedersen176f3602011-10-26 14:47:27 -0700431{
432 struct ieee80211_local *local = sdata->local;
Johannes Berg55de9082012-07-26 17:24:39 +0200433 struct ieee80211_chanctx_conf *chanctx_conf;
434 struct ieee80211_channel *channel;
Johannes Berg55de9082012-07-26 17:24:39 +0200435 struct ieee80211_supported_band *sband;
436 struct ieee80211_sta_ht_cap *ht_cap;
Thomas Pedersen176f3602011-10-26 14:47:27 -0700437 u8 *pos;
438
Johannes Berg55de9082012-07-26 17:24:39 +0200439 rcu_read_lock();
440 chanctx_conf = rcu_dereference(sdata->vif.chanctx_conf);
441 if (WARN_ON(!chanctx_conf)) {
442 rcu_read_unlock();
443 return -EINVAL;
444 }
Johannes Berg4bf88532012-11-09 11:39:59 +0100445 channel = chanctx_conf->def.chan;
Johannes Berg55de9082012-07-26 17:24:39 +0200446 rcu_read_unlock();
447
448 sband = local->hw.wiphy->bands[channel->band];
449 ht_cap = &sband->ht_cap;
450
Bob Copelandc85fb532015-08-27 09:00:18 -0400451 if (!ht_cap->ht_supported ||
452 sdata->vif.bss_conf.chandef.width == NL80211_CHAN_WIDTH_20_NOHT ||
453 sdata->vif.bss_conf.chandef.width == NL80211_CHAN_WIDTH_5 ||
454 sdata->vif.bss_conf.chandef.width == NL80211_CHAN_WIDTH_10)
Thomas Pedersen176f3602011-10-26 14:47:27 -0700455 return 0;
456
Johannes Berg074d46d2012-03-15 19:45:16 +0100457 if (skb_tailroom(skb) < 2 + sizeof(struct ieee80211_ht_operation))
Thomas Pedersen176f3602011-10-26 14:47:27 -0700458 return -ENOMEM;
459
Johannes Berg074d46d2012-03-15 19:45:16 +0100460 pos = skb_put(skb, 2 + sizeof(struct ieee80211_ht_operation));
Johannes Berg4bf88532012-11-09 11:39:59 +0100461 ieee80211_ie_build_ht_oper(pos, ht_cap, &sdata->vif.bss_conf.chandef,
Arik Nemtsov57f255f2015-10-25 10:59:34 +0200462 sdata->vif.bss_conf.ht_operation_mode,
463 false);
Thomas Pedersen176f3602011-10-26 14:47:27 -0700464
465 return 0;
466}
Johannes Bergbf7cd942013-02-15 14:40:31 +0100467
Bob Copelandc85fb532015-08-27 09:00:18 -0400468int mesh_add_vht_cap_ie(struct ieee80211_sub_if_data *sdata,
469 struct sk_buff *skb)
470{
Bob Copelandc85fb532015-08-27 09:00:18 -0400471 struct ieee80211_supported_band *sband;
472 u8 *pos;
473
Mohammed Shafi Shajakhan21a8e9d2017-04-27 12:45:38 +0530474 sband = ieee80211_get_sband(sdata);
475 if (!sband)
476 return -EINVAL;
477
Bob Copelandc85fb532015-08-27 09:00:18 -0400478 if (!sband->vht_cap.vht_supported ||
479 sdata->vif.bss_conf.chandef.width == NL80211_CHAN_WIDTH_20_NOHT ||
480 sdata->vif.bss_conf.chandef.width == NL80211_CHAN_WIDTH_5 ||
481 sdata->vif.bss_conf.chandef.width == NL80211_CHAN_WIDTH_10)
482 return 0;
483
484 if (skb_tailroom(skb) < 2 + sizeof(struct ieee80211_vht_cap))
485 return -ENOMEM;
486
487 pos = skb_put(skb, 2 + sizeof(struct ieee80211_vht_cap));
488 ieee80211_ie_build_vht_cap(pos, &sband->vht_cap, sband->vht_cap.cap);
489
490 return 0;
491}
492
493int mesh_add_vht_oper_ie(struct ieee80211_sub_if_data *sdata,
494 struct sk_buff *skb)
495{
496 struct ieee80211_local *local = sdata->local;
497 struct ieee80211_chanctx_conf *chanctx_conf;
498 struct ieee80211_channel *channel;
499 struct ieee80211_supported_band *sband;
500 struct ieee80211_sta_vht_cap *vht_cap;
501 u8 *pos;
502
503 rcu_read_lock();
504 chanctx_conf = rcu_dereference(sdata->vif.chanctx_conf);
505 if (WARN_ON(!chanctx_conf)) {
506 rcu_read_unlock();
507 return -EINVAL;
508 }
509 channel = chanctx_conf->def.chan;
510 rcu_read_unlock();
511
512 sband = local->hw.wiphy->bands[channel->band];
513 vht_cap = &sband->vht_cap;
514
515 if (!vht_cap->vht_supported ||
516 sdata->vif.bss_conf.chandef.width == NL80211_CHAN_WIDTH_20_NOHT ||
517 sdata->vif.bss_conf.chandef.width == NL80211_CHAN_WIDTH_5 ||
518 sdata->vif.bss_conf.chandef.width == NL80211_CHAN_WIDTH_10)
519 return 0;
520
521 if (skb_tailroom(skb) < 2 + sizeof(struct ieee80211_vht_operation))
522 return -ENOMEM;
523
524 pos = skb_put(skb, 2 + sizeof(struct ieee80211_vht_operation));
525 ieee80211_ie_build_vht_oper(pos, vht_cap,
526 &sdata->vif.bss_conf.chandef);
527
528 return 0;
529}
530
Luis Carlos Cobo2e3c8732008-02-23 15:17:09 +0100531static void ieee80211_mesh_path_timer(unsigned long data)
532{
533 struct ieee80211_sub_if_data *sdata =
534 (struct ieee80211_sub_if_data *) data;
Luis Carlos Cobo2e3c8732008-02-23 15:17:09 +0100535
Stanislaw Gruszka690205f2013-02-28 10:55:29 +0100536 ieee80211_queue_work(&sdata->local->hw, &sdata->work);
Luis Carlos Cobo2e3c8732008-02-23 15:17:09 +0100537}
538
Rui Pauloe304bfd2009-11-09 23:46:56 +0000539static void ieee80211_mesh_path_root_timer(unsigned long data)
540{
541 struct ieee80211_sub_if_data *sdata =
542 (struct ieee80211_sub_if_data *) data;
543 struct ieee80211_if_mesh *ifmsh = &sdata->u.mesh;
Rui Pauloe304bfd2009-11-09 23:46:56 +0000544
545 set_bit(MESH_WORK_ROOT, &ifmsh->wrkq_flags);
546
Stanislaw Gruszka690205f2013-02-28 10:55:29 +0100547 ieee80211_queue_work(&sdata->local->hw, &sdata->work);
Rui Pauloe304bfd2009-11-09 23:46:56 +0000548}
549
Rui Paulo63c57232009-11-09 23:46:57 +0000550void ieee80211_mesh_root_setup(struct ieee80211_if_mesh *ifmsh)
551{
Chun-Yeow Yeohdbb912c2012-06-14 02:06:09 +0800552 if (ifmsh->mshcfg.dot11MeshHWMPRootMode > IEEE80211_ROOTMODE_ROOT)
Rui Paulo63c57232009-11-09 23:46:57 +0000553 set_bit(MESH_WORK_ROOT, &ifmsh->wrkq_flags);
554 else {
555 clear_bit(MESH_WORK_ROOT, &ifmsh->wrkq_flags);
556 /* stop running timer */
557 del_timer_sync(&ifmsh->mesh_path_root_timer);
558 }
559}
560
Johannes Berg902acc72008-02-23 15:17:19 +0100561/**
Javier Cardona3c5772a2009-08-10 12:15:48 -0700562 * ieee80211_fill_mesh_addresses - fill addresses of a locally originated mesh frame
Johannes Bergbf7cd942013-02-15 14:40:31 +0100563 * @hdr: 802.11 frame header
Javier Cardona3c5772a2009-08-10 12:15:48 -0700564 * @fc: frame control field
565 * @meshda: destination address in the mesh
566 * @meshsa: source address address in the mesh. Same as TA, as frame is
567 * locally originated.
568 *
569 * Return the length of the 802.11 (does not include a mesh control header)
570 */
Johannes Berg15ff6362009-11-17 13:34:04 +0100571int ieee80211_fill_mesh_addresses(struct ieee80211_hdr *hdr, __le16 *fc,
572 const u8 *meshda, const u8 *meshsa)
573{
Javier Cardona3c5772a2009-08-10 12:15:48 -0700574 if (is_multicast_ether_addr(meshda)) {
575 *fc |= cpu_to_le16(IEEE80211_FCTL_FROMDS);
576 /* DA TA SA */
577 memcpy(hdr->addr1, meshda, ETH_ALEN);
578 memcpy(hdr->addr2, meshsa, ETH_ALEN);
579 memcpy(hdr->addr3, meshsa, ETH_ALEN);
580 return 24;
581 } else {
Javier Cardona2154c81c2011-09-07 17:49:53 -0700582 *fc |= cpu_to_le16(IEEE80211_FCTL_FROMDS | IEEE80211_FCTL_TODS);
Javier Cardona3c5772a2009-08-10 12:15:48 -0700583 /* RA TA DA SA */
Joe Perchesc84a67a2015-03-02 19:54:57 -0800584 eth_zero_addr(hdr->addr1); /* RA is resolved later */
Javier Cardona3c5772a2009-08-10 12:15:48 -0700585 memcpy(hdr->addr2, meshsa, ETH_ALEN);
586 memcpy(hdr->addr3, meshda, ETH_ALEN);
587 memcpy(hdr->addr4, meshsa, ETH_ALEN);
588 return 30;
589 }
590}
591
592/**
Johannes Berg902acc72008-02-23 15:17:19 +0100593 * ieee80211_new_mesh_header - create a new mesh header
Johannes Berg902acc72008-02-23 15:17:19 +0100594 * @sdata: mesh interface to be used
Johannes Bergbf7cd942013-02-15 14:40:31 +0100595 * @meshhdr: uninitialized mesh header
Javier Cardona61ad5392010-12-16 17:23:34 -0800596 * @addr4or5: 1st address in the ae header, which may correspond to address 4
597 * (if addr6 is NULL) or address 5 (if addr6 is present). It may
598 * be NULL.
599 * @addr6: 2nd address in the ae header, which corresponds to addr6 of the
600 * mesh frame
Johannes Berg902acc72008-02-23 15:17:19 +0100601 *
602 * Return the header length.
603 */
Andrzej Hajda5edfcee2015-09-25 08:42:00 +0200604unsigned int ieee80211_new_mesh_header(struct ieee80211_sub_if_data *sdata,
605 struct ieee80211s_hdr *meshhdr,
606 const char *addr4or5, const char *addr6)
Johannes Berg902acc72008-02-23 15:17:19 +0100607{
Johannes Bergbf7cd942013-02-15 14:40:31 +0100608 if (WARN_ON(!addr4or5 && addr6))
609 return 0;
610
Julia Lawall0c3cee72009-12-09 20:25:59 +0100611 memset(meshhdr, 0, sizeof(*meshhdr));
Johannes Bergbf7cd942013-02-15 14:40:31 +0100612
Johannes Berg472dbc42008-09-11 00:01:49 +0200613 meshhdr->ttl = sdata->u.mesh.mshcfg.dot11MeshTTL;
Johannes Bergbf7cd942013-02-15 14:40:31 +0100614
615 /* FIXME: racy -- TX on multiple queues can be concurrent */
Johannes Berg472dbc42008-09-11 00:01:49 +0200616 put_unaligned(cpu_to_le32(sdata->u.mesh.mesh_seqnum), &meshhdr->seqnum);
617 sdata->u.mesh.mesh_seqnum++;
Johannes Bergbf7cd942013-02-15 14:40:31 +0100618
Javier Cardona61ad5392010-12-16 17:23:34 -0800619 if (addr4or5 && !addr6) {
Javier Cardona3c5772a2009-08-10 12:15:48 -0700620 meshhdr->flags |= MESH_FLAGS_AE_A4;
Javier Cardona61ad5392010-12-16 17:23:34 -0800621 memcpy(meshhdr->eaddr1, addr4or5, ETH_ALEN);
Johannes Bergbf7cd942013-02-15 14:40:31 +0100622 return 2 * ETH_ALEN;
Javier Cardona61ad5392010-12-16 17:23:34 -0800623 } else if (addr4or5 && addr6) {
Javier Cardona3c5772a2009-08-10 12:15:48 -0700624 meshhdr->flags |= MESH_FLAGS_AE_A5_A6;
Javier Cardona61ad5392010-12-16 17:23:34 -0800625 memcpy(meshhdr->eaddr1, addr4or5, ETH_ALEN);
626 memcpy(meshhdr->eaddr2, addr6, ETH_ALEN);
Johannes Bergbf7cd942013-02-15 14:40:31 +0100627 return 3 * ETH_ALEN;
Javier Cardona3c5772a2009-08-10 12:15:48 -0700628 }
Johannes Bergbf7cd942013-02-15 14:40:31 +0100629
630 return ETH_ALEN;
Johannes Berg902acc72008-02-23 15:17:19 +0100631}
632
Johannes Bergbf7cd942013-02-15 14:40:31 +0100633static void ieee80211_mesh_housekeeping(struct ieee80211_sub_if_data *sdata)
Johannes Berg472dbc42008-09-11 00:01:49 +0200634{
Johannes Bergbf7cd942013-02-15 14:40:31 +0100635 struct ieee80211_if_mesh *ifmsh = &sdata->u.mesh;
Marco Porschdf323812012-08-08 07:58:43 +0200636 u32 changed;
Johannes Berg472dbc42008-09-11 00:01:49 +0200637
Masashi Honma31f909a2015-02-24 22:42:16 +0900638 if (ifmsh->mshcfg.plink_timeout > 0)
639 ieee80211_sta_expire(sdata, ifmsh->mshcfg.plink_timeout * HZ);
Johannes Berg472dbc42008-09-11 00:01:49 +0200640 mesh_path_expire(sdata);
641
Marco Porschdf323812012-08-08 07:58:43 +0200642 changed = mesh_accept_plinks_update(sdata);
Thomas Pedersen2b5e1962013-02-14 11:20:13 -0800643 ieee80211_mbss_info_change_notify(sdata, changed);
Johannes Berg472dbc42008-09-11 00:01:49 +0200644
Johannes Berg472dbc42008-09-11 00:01:49 +0200645 mod_timer(&ifmsh->housekeeping_timer,
Johannes Bergbf7cd942013-02-15 14:40:31 +0100646 round_jiffies(jiffies +
647 IEEE80211_MESH_HOUSEKEEPING_INTERVAL));
Johannes Berg472dbc42008-09-11 00:01:49 +0200648}
649
Rui Pauloe304bfd2009-11-09 23:46:56 +0000650static void ieee80211_mesh_rootpath(struct ieee80211_sub_if_data *sdata)
651{
652 struct ieee80211_if_mesh *ifmsh = &sdata->u.mesh;
Chun-Yeow Yeoha69cc442012-06-14 02:06:07 +0800653 u32 interval;
Rui Pauloe304bfd2009-11-09 23:46:56 +0000654
655 mesh_path_tx_root_frame(sdata);
Chun-Yeow Yeoha69cc442012-06-14 02:06:07 +0800656
657 if (ifmsh->mshcfg.dot11MeshHWMPRootMode == IEEE80211_PROACTIVE_RANN)
658 interval = ifmsh->mshcfg.dot11MeshHWMPRannInterval;
659 else
660 interval = ifmsh->mshcfg.dot11MeshHWMProotInterval;
661
Rui Pauloe304bfd2009-11-09 23:46:56 +0000662 mod_timer(&ifmsh->mesh_path_root_timer,
Chun-Yeow Yeoha69cc442012-06-14 02:06:07 +0800663 round_jiffies(TU_TO_EXP_TIME(interval)));
Rui Pauloe304bfd2009-11-09 23:46:56 +0000664}
665
Thomas Pedersen2b5e1962013-02-14 11:20:13 -0800666static int
667ieee80211_mesh_build_beacon(struct ieee80211_if_mesh *ifmsh)
668{
669 struct beacon_data *bcn;
670 int head_len, tail_len;
671 struct sk_buff *skb;
672 struct ieee80211_mgmt *mgmt;
673 struct ieee80211_chanctx_conf *chanctx_conf;
Chun-Yeow Yeohb8456a12013-10-17 15:55:02 -0700674 struct mesh_csa_settings *csa;
Johannes Berg57fbcce2016-04-12 15:56:15 +0200675 enum nl80211_band band;
Thomas Pedersen2b5e1962013-02-14 11:20:13 -0800676 u8 *pos;
677 struct ieee80211_sub_if_data *sdata;
678 int hdr_len = offsetof(struct ieee80211_mgmt, u.beacon) +
679 sizeof(mgmt->u.beacon);
680
681 sdata = container_of(ifmsh, struct ieee80211_sub_if_data, u.mesh);
682 rcu_read_lock();
683 chanctx_conf = rcu_dereference(sdata->vif.chanctx_conf);
684 band = chanctx_conf->def.chan->band;
685 rcu_read_unlock();
686
687 head_len = hdr_len +
688 2 + /* NULL SSID */
Chun-Yeow Yeohb8456a12013-10-17 15:55:02 -0700689 /* Channel Switch Announcement */
690 2 + sizeof(struct ieee80211_channel_sw_ie) +
Masahiro Yamada08a7e622017-02-27 14:28:41 -0800691 /* Mesh Channel Switch Parameters */
Chun-Yeow Yeohb8456a12013-10-17 15:55:02 -0700692 2 + sizeof(struct ieee80211_mesh_chansw_params_ie) +
Simon Wunderlich75d627d2017-05-23 17:00:42 +0200693 /* Channel Switch Wrapper + Wide Bandwidth CSA IE */
694 2 + 2 + sizeof(struct ieee80211_wide_bw_chansw_ie) +
695 2 + sizeof(struct ieee80211_sec_chan_offs_ie) +
Thomas Pedersen2b5e1962013-02-14 11:20:13 -0800696 2 + 8 + /* supported rates */
697 2 + 3; /* DS params */
698 tail_len = 2 + (IEEE80211_MAX_SUPP_RATES - 8) +
699 2 + sizeof(struct ieee80211_ht_cap) +
700 2 + sizeof(struct ieee80211_ht_operation) +
701 2 + ifmsh->mesh_id_len +
702 2 + sizeof(struct ieee80211_meshconf_ie) +
703 2 + sizeof(__le16) + /* awake window */
Bob Copelandc85fb532015-08-27 09:00:18 -0400704 2 + sizeof(struct ieee80211_vht_cap) +
705 2 + sizeof(struct ieee80211_vht_operation) +
Thomas Pedersen2b5e1962013-02-14 11:20:13 -0800706 ifmsh->ie_len;
707
708 bcn = kzalloc(sizeof(*bcn) + head_len + tail_len, GFP_KERNEL);
709 /* need an skb for IE builders to operate on */
710 skb = dev_alloc_skb(max(head_len, tail_len));
711
712 if (!bcn || !skb)
713 goto out_free;
714
715 /*
716 * pointers go into the block we allocated,
717 * memory is | beacon_data | head | tail |
718 */
719 bcn->head = ((u8 *) bcn) + sizeof(*bcn);
720
721 /* fill in the head */
722 mgmt = (struct ieee80211_mgmt *) skb_put(skb, hdr_len);
723 memset(mgmt, 0, hdr_len);
724 mgmt->frame_control = cpu_to_le16(IEEE80211_FTYPE_MGMT |
725 IEEE80211_STYPE_BEACON);
726 eth_broadcast_addr(mgmt->da);
727 memcpy(mgmt->sa, sdata->vif.addr, ETH_ALEN);
728 memcpy(mgmt->bssid, sdata->vif.addr, ETH_ALEN);
729 ieee80211_mps_set_frame_flags(sdata, NULL, (void *) mgmt);
730 mgmt->u.beacon.beacon_int =
731 cpu_to_le16(sdata->vif.bss_conf.beacon_int);
732 mgmt->u.beacon.capab_info |= cpu_to_le16(
733 sdata->u.mesh.security ? WLAN_CAPABILITY_PRIVACY : 0);
734
735 pos = skb_put(skb, 2);
736 *pos++ = WLAN_EID_SSID;
737 *pos++ = 0x0;
738
Chun-Yeow Yeohb8456a12013-10-17 15:55:02 -0700739 rcu_read_lock();
740 csa = rcu_dereference(ifmsh->csa);
741 if (csa) {
Simon Wunderlich75d627d2017-05-23 17:00:42 +0200742 enum nl80211_channel_type ct;
743 struct cfg80211_chan_def *chandef;
744 int ie_len = 2 + sizeof(struct ieee80211_channel_sw_ie) +
745 2 + sizeof(struct ieee80211_mesh_chansw_params_ie);
746
747 pos = skb_put(skb, ie_len);
748 memset(pos, 0, ie_len);
Chun-Yeow Yeohb8456a12013-10-17 15:55:02 -0700749 *pos++ = WLAN_EID_CHANNEL_SWITCH;
750 *pos++ = 3;
751 *pos++ = 0x0;
752 *pos++ = ieee80211_frequency_to_channel(
753 csa->settings.chandef.chan->center_freq);
Chun-Yeow Yeoh8df734e2015-06-09 13:35:33 +0800754 bcn->csa_current_counter = csa->settings.count;
Michal Kazioraf296bd2014-06-05 14:21:36 +0200755 bcn->csa_counter_offsets[0] = hdr_len + 6;
Chun-Yeow Yeohb8456a12013-10-17 15:55:02 -0700756 *pos++ = csa->settings.count;
757 *pos++ = WLAN_EID_CHAN_SWITCH_PARAM;
758 *pos++ = 6;
Luciano Coelho0cb4d4d2014-01-13 19:42:58 +0200759 if (ifmsh->csa_role == IEEE80211_MESH_CSA_ROLE_INIT) {
Chun-Yeow Yeohb8456a12013-10-17 15:55:02 -0700760 *pos++ = ifmsh->mshcfg.dot11MeshTTL;
761 *pos |= WLAN_EID_CHAN_SWITCH_PARAM_INITIATOR;
762 } else {
763 *pos++ = ifmsh->chsw_ttl;
764 }
765 *pos++ |= csa->settings.block_tx ?
766 WLAN_EID_CHAN_SWITCH_PARAM_TX_RESTRICT : 0x00;
767 put_unaligned_le16(WLAN_REASON_MESH_CHAN, pos);
768 pos += 2;
Chun-Yeow Yeohca91dc92013-11-12 10:31:48 +0800769 put_unaligned_le16(ifmsh->pre_value, pos);
Chun-Yeow Yeohb8456a12013-10-17 15:55:02 -0700770 pos += 2;
Simon Wunderlich75d627d2017-05-23 17:00:42 +0200771
772 switch (csa->settings.chandef.width) {
773 case NL80211_CHAN_WIDTH_40:
774 ie_len = 2 + sizeof(struct ieee80211_sec_chan_offs_ie);
775 pos = skb_put(skb, ie_len);
776 memset(pos, 0, ie_len);
777
778 *pos++ = WLAN_EID_SECONDARY_CHANNEL_OFFSET; /* EID */
779 *pos++ = 1; /* len */
780 ct = cfg80211_get_chandef_type(&csa->settings.chandef);
781 if (ct == NL80211_CHAN_HT40PLUS)
782 *pos++ = IEEE80211_HT_PARAM_CHA_SEC_ABOVE;
783 else
784 *pos++ = IEEE80211_HT_PARAM_CHA_SEC_BELOW;
785 break;
786 case NL80211_CHAN_WIDTH_80:
787 case NL80211_CHAN_WIDTH_80P80:
788 case NL80211_CHAN_WIDTH_160:
789 /* Channel Switch Wrapper + Wide Bandwidth CSA IE */
790 ie_len = 2 + 2 +
791 sizeof(struct ieee80211_wide_bw_chansw_ie);
792 pos = skb_put(skb, ie_len);
793 memset(pos, 0, ie_len);
794
795 *pos++ = WLAN_EID_CHANNEL_SWITCH_WRAPPER; /* EID */
796 *pos++ = 5; /* len */
797 /* put sub IE */
798 chandef = &csa->settings.chandef;
799 ieee80211_ie_build_wide_bw_cs(pos, chandef);
800 break;
801 default:
802 break;
803 }
Chun-Yeow Yeohb8456a12013-10-17 15:55:02 -0700804 }
805 rcu_read_unlock();
806
Thomas Pedersen2b5e1962013-02-14 11:20:13 -0800807 if (ieee80211_add_srates_ie(sdata, skb, true, band) ||
Johannes Bergbf7cd942013-02-15 14:40:31 +0100808 mesh_add_ds_params_ie(sdata, skb))
Thomas Pedersen2b5e1962013-02-14 11:20:13 -0800809 goto out_free;
810
811 bcn->head_len = skb->len;
812 memcpy(bcn->head, skb->data, bcn->head_len);
813
814 /* now the tail */
815 skb_trim(skb, 0);
816 bcn->tail = bcn->head + bcn->head_len;
817
818 if (ieee80211_add_ext_srates_ie(sdata, skb, true, band) ||
Johannes Bergbf7cd942013-02-15 14:40:31 +0100819 mesh_add_rsn_ie(sdata, skb) ||
820 mesh_add_ht_cap_ie(sdata, skb) ||
821 mesh_add_ht_oper_ie(sdata, skb) ||
822 mesh_add_meshid_ie(sdata, skb) ||
823 mesh_add_meshconf_ie(sdata, skb) ||
824 mesh_add_awake_window_ie(sdata, skb) ||
Bob Copelandc85fb532015-08-27 09:00:18 -0400825 mesh_add_vht_cap_ie(sdata, skb) ||
826 mesh_add_vht_oper_ie(sdata, skb) ||
Johannes Bergbf7cd942013-02-15 14:40:31 +0100827 mesh_add_vendor_ies(sdata, skb))
Thomas Pedersen2b5e1962013-02-14 11:20:13 -0800828 goto out_free;
829
830 bcn->tail_len = skb->len;
831 memcpy(bcn->tail, skb->data, bcn->tail_len);
Thomas Pedersen43552be2013-12-15 13:14:16 -0800832 bcn->meshconf = (struct ieee80211_meshconf_ie *)
833 (bcn->tail + ifmsh->meshconf_offset);
Thomas Pedersen2b5e1962013-02-14 11:20:13 -0800834
835 dev_kfree_skb(skb);
836 rcu_assign_pointer(ifmsh->beacon, bcn);
837 return 0;
838out_free:
839 kfree(bcn);
840 dev_kfree_skb(skb);
841 return -ENOMEM;
842}
843
844static int
Johannes Berg8d61ffa2013-05-10 12:32:47 +0200845ieee80211_mesh_rebuild_beacon(struct ieee80211_sub_if_data *sdata)
Thomas Pedersen2b5e1962013-02-14 11:20:13 -0800846{
Thomas Pedersen2b5e1962013-02-14 11:20:13 -0800847 struct beacon_data *old_bcn;
848 int ret;
Thomas Pedersen2b5e1962013-02-14 11:20:13 -0800849
Johannes Berg8d61ffa2013-05-10 12:32:47 +0200850 old_bcn = rcu_dereference_protected(sdata->u.mesh.beacon,
851 lockdep_is_held(&sdata->wdev.mtx));
852 ret = ieee80211_mesh_build_beacon(&sdata->u.mesh);
Thomas Pedersen2b5e1962013-02-14 11:20:13 -0800853 if (ret)
854 /* just reuse old beacon */
Johannes Berg8d61ffa2013-05-10 12:32:47 +0200855 return ret;
Thomas Pedersen2b5e1962013-02-14 11:20:13 -0800856
857 if (old_bcn)
858 kfree_rcu(old_bcn, rcu_head);
Johannes Berg8d61ffa2013-05-10 12:32:47 +0200859 return 0;
Thomas Pedersen2b5e1962013-02-14 11:20:13 -0800860}
861
862void ieee80211_mbss_info_change_notify(struct ieee80211_sub_if_data *sdata,
863 u32 changed)
864{
Thomas Pedersenf81a9de2013-06-13 15:54:41 -0700865 struct ieee80211_if_mesh *ifmsh = &sdata->u.mesh;
866 unsigned long bits = changed;
867 u32 bit;
868
869 if (!bits)
870 return;
871
872 /* if we race with running work, worst case this work becomes a noop */
873 for_each_set_bit(bit, &bits, sizeof(changed) * BITS_PER_BYTE)
874 set_bit(bit, &ifmsh->mbss_changed);
875 set_bit(MESH_WORK_MBSS_CHANGED, &ifmsh->wrkq_flags);
876 ieee80211_queue_work(&sdata->local->hw, &sdata->work);
Thomas Pedersen2b5e1962013-02-14 11:20:13 -0800877}
878
879int ieee80211_start_mesh(struct ieee80211_sub_if_data *sdata)
Johannes Berg472dbc42008-09-11 00:01:49 +0200880{
881 struct ieee80211_if_mesh *ifmsh = &sdata->u.mesh;
882 struct ieee80211_local *local = sdata->local;
Chun-Yeow Yeohf4eabc92012-12-13 18:59:57 +0800883 u32 changed = BSS_CHANGED_BEACON |
884 BSS_CHANGED_BEACON_ENABLED |
885 BSS_CHANGED_HT |
886 BSS_CHANGED_BASIC_RATES |
887 BSS_CHANGED_BEACON_INT;
Johannes Berg472dbc42008-09-11 00:01:49 +0200888
Johannes Berg09b17472010-12-03 09:20:41 +0100889 local->fif_other_bss++;
890 /* mesh ifaces must set allmulti to forward mcast traffic */
891 atomic_inc(&local->iff_allmultis);
892 ieee80211_configure_filter(local);
893
Javier Cardonac7108a72010-12-16 17:37:50 -0800894 ifmsh->mesh_cc_id = 0; /* Disabled */
Javier Cardonadbf498f2012-03-31 11:31:32 -0700895 /* register sync ops from extensible synchronization framework */
896 ifmsh->sync_ops = ieee80211_mesh_sync_ops_get(ifmsh->mesh_sp_id);
Javier Cardonadbf498f2012-03-31 11:31:32 -0700897 ifmsh->sync_offset_clockdrift_max = 0;
Rui Paulo6b9ac442009-10-20 21:21:48 +0100898 set_bit(MESH_WORK_HOUSEKEEPING, &ifmsh->wrkq_flags);
Rui Paulo63c57232009-11-09 23:46:57 +0000899 ieee80211_mesh_root_setup(ifmsh);
Johannes Berg64592c82010-06-10 10:21:31 +0200900 ieee80211_queue_work(&local->hw, &sdata->work);
Ashok Nagarajan70c33ea2012-04-30 14:20:32 -0700901 sdata->vif.bss_conf.ht_operation_mode =
902 ifmsh->mshcfg.ht_opmode;
Johannes Bergd6a83222012-12-14 14:06:28 +0100903 sdata->vif.bss_conf.enable_beacon = true;
Chun-Yeow Yeohf4eabc92012-12-13 18:59:57 +0800904
Thomas Pedersen39886b62013-02-13 12:14:19 -0800905 changed |= ieee80211_mps_local_status_update(sdata);
Marco Porsch3f52b7e2013-01-30 18:14:08 +0100906
Thomas Pedersen2b5e1962013-02-14 11:20:13 -0800907 if (ieee80211_mesh_build_beacon(ifmsh)) {
908 ieee80211_stop_mesh(sdata);
909 return -ENOMEM;
910 }
911
Thomas Pedersen057d5f42013-12-19 10:25:15 -0800912 ieee80211_recalc_dtim(local, sdata);
Chun-Yeow Yeohf4eabc92012-12-13 18:59:57 +0800913 ieee80211_bss_info_change_notify(sdata, changed);
Johannes Bergc405c622012-07-30 19:44:12 +0200914
915 netif_carrier_on(sdata->dev);
Thomas Pedersen2b5e1962013-02-14 11:20:13 -0800916 return 0;
Johannes Berg472dbc42008-09-11 00:01:49 +0200917}
918
919void ieee80211_stop_mesh(struct ieee80211_sub_if_data *sdata)
920{
Johannes Berg09b17472010-12-03 09:20:41 +0100921 struct ieee80211_local *local = sdata->local;
Johannes Berg29cbe682010-12-03 09:20:44 +0100922 struct ieee80211_if_mesh *ifmsh = &sdata->u.mesh;
Thomas Pedersen2b5e1962013-02-14 11:20:13 -0800923 struct beacon_data *bcn;
Johannes Berg29cbe682010-12-03 09:20:44 +0100924
Johannes Bergc405c622012-07-30 19:44:12 +0200925 netif_carrier_off(sdata->dev);
926
Maital Hahnc37a54a2016-07-13 14:44:41 +0300927 /* flush STAs and mpaths on this iface */
928 sta_info_flush(sdata);
929 mesh_path_flush_by_iface(sdata);
930
Thomas Pedersen0d466b9c2012-08-03 12:21:32 -0700931 /* stop the beacon */
Johannes Berg29cbe682010-12-03 09:20:44 +0100932 ifmsh->mesh_id_len = 0;
Johannes Bergd6a83222012-12-14 14:06:28 +0100933 sdata->vif.bss_conf.enable_beacon = false;
934 clear_bit(SDATA_STATE_OFFCHANNEL_BEACON_STOPPED, &sdata->state);
Johannes Berg29cbe682010-12-03 09:20:44 +0100935 ieee80211_bss_info_change_notify(sdata, BSS_CHANGED_BEACON_ENABLED);
Maital Hahnc37a54a2016-07-13 14:44:41 +0300936
937 /* remove beacon */
Thomas Pedersen2b5e1962013-02-14 11:20:13 -0800938 bcn = rcu_dereference_protected(ifmsh->beacon,
Johannes Berg8d61ffa2013-05-10 12:32:47 +0200939 lockdep_is_held(&sdata->wdev.mtx));
Monam Agarwal0c2bef462014-03-24 00:51:43 +0530940 RCU_INIT_POINTER(ifmsh->beacon, NULL);
Thomas Pedersen2b5e1962013-02-14 11:20:13 -0800941 kfree_rcu(bcn, rcu_head);
Thomas Pedersen0d466b9c2012-08-03 12:21:32 -0700942
Marco Porsch3f52b7e2013-01-30 18:14:08 +0100943 /* free all potentially still buffered group-addressed frames */
944 local->total_ps_buffered -= skb_queue_len(&ifmsh->ps.bc_buf);
945 skb_queue_purge(&ifmsh->ps.bc_buf);
946
Johannes Berg472dbc42008-09-11 00:01:49 +0200947 del_timer_sync(&sdata->u.mesh.housekeeping_timer);
Rui Pauloe304bfd2009-11-09 23:46:56 +0000948 del_timer_sync(&sdata->u.mesh.mesh_path_root_timer);
Johannes Bergdd4c9262012-08-01 21:03:21 +0200949 del_timer_sync(&sdata->u.mesh.mesh_path_timer);
Johannes Berg09b17472010-12-03 09:20:41 +0100950
Thomas Pedersenf81a9de2013-06-13 15:54:41 -0700951 /* clear any mesh work (for next join) we may have accrued */
952 ifmsh->wrkq_flags = 0;
953 ifmsh->mbss_changed = 0;
954
Johannes Berg09b17472010-12-03 09:20:41 +0100955 local->fif_other_bss--;
956 atomic_dec(&local->iff_allmultis);
957 ieee80211_configure_filter(local);
Johannes Berg472dbc42008-09-11 00:01:49 +0200958}
959
Benjamin Berg5d553712017-05-16 11:23:10 +0200960static void ieee80211_mesh_csa_mark_radar(struct ieee80211_sub_if_data *sdata)
961{
962 int err;
963
964 /* if the current channel is a DFS channel, mark the channel as
965 * unavailable.
966 */
967 err = cfg80211_chandef_dfs_required(sdata->local->hw.wiphy,
968 &sdata->vif.bss_conf.chandef,
969 NL80211_IFTYPE_MESH_POINT);
970 if (err > 0)
971 cfg80211_radar_event(sdata->local->hw.wiphy,
972 &sdata->vif.bss_conf.chandef, GFP_ATOMIC);
973}
974
Chun-Yeow Yeoh33a45862013-10-17 15:55:18 -0700975static bool
976ieee80211_mesh_process_chnswitch(struct ieee80211_sub_if_data *sdata,
977 struct ieee802_11_elems *elems, bool beacon)
978{
979 struct cfg80211_csa_settings params;
980 struct ieee80211_csa_ie csa_ie;
Chun-Yeow Yeoh33a45862013-10-17 15:55:18 -0700981 struct ieee80211_if_mesh *ifmsh = &sdata->u.mesh;
Mohammed Shafi Shajakhan21a8e9d2017-04-27 12:45:38 +0530982 struct ieee80211_supported_band *sband;
Luciano Coelho0cb4d4d2014-01-13 19:42:58 +0200983 int err;
Chun-Yeow Yeoh33a45862013-10-17 15:55:18 -0700984 u32 sta_flags;
985
Michal Kaziordbd72852014-01-29 07:56:21 +0100986 sdata_assert_lock(sdata);
987
Mohammed Shafi Shajakhan21a8e9d2017-04-27 12:45:38 +0530988 sband = ieee80211_get_sband(sdata);
989 if (!sband)
990 return false;
991
Simon Wunderlich71ec2892017-05-23 17:00:43 +0200992 sta_flags = 0;
Chun-Yeow Yeoh33a45862013-10-17 15:55:18 -0700993 switch (sdata->vif.bss_conf.chandef.width) {
994 case NL80211_CHAN_WIDTH_20_NOHT:
995 sta_flags |= IEEE80211_STA_DISABLE_HT;
996 case NL80211_CHAN_WIDTH_20:
997 sta_flags |= IEEE80211_STA_DISABLE_40MHZ;
Simon Wunderlich71ec2892017-05-23 17:00:43 +0200998 case NL80211_CHAN_WIDTH_40:
999 sta_flags |= IEEE80211_STA_DISABLE_VHT;
Chun-Yeow Yeoh33a45862013-10-17 15:55:18 -07001000 break;
1001 default:
1002 break;
1003 }
1004
1005 memset(&params, 0, sizeof(params));
Mohammed Shafi Shajakhan21a8e9d2017-04-27 12:45:38 +05301006 err = ieee80211_parse_ch_switch_ie(sdata, elems, sband->band,
Chun-Yeow Yeoh33a45862013-10-17 15:55:18 -07001007 sta_flags, sdata->vif.addr,
1008 &csa_ie);
1009 if (err < 0)
1010 return false;
1011 if (err)
1012 return false;
1013
Benjamin Berg5d553712017-05-16 11:23:10 +02001014 /* Mark the channel unavailable if the reason for the switch is
1015 * regulatory.
1016 */
1017 if (csa_ie.reason_code == WLAN_REASON_MESH_CHAN_REGULATORY)
1018 ieee80211_mesh_csa_mark_radar(sdata);
1019
Chun-Yeow Yeoh33a45862013-10-17 15:55:18 -07001020 params.chandef = csa_ie.chandef;
1021 params.count = csa_ie.count;
1022
Chun-Yeow Yeoh33a45862013-10-17 15:55:18 -07001023 if (!cfg80211_chandef_usable(sdata->local->hw.wiphy, &params.chandef,
Benjamin Berg0ab2e55d2017-05-16 11:23:13 +02001024 IEEE80211_CHAN_DISABLED) ||
1025 !cfg80211_reg_can_beacon(sdata->local->hw.wiphy, &params.chandef,
1026 NL80211_IFTYPE_MESH_POINT)) {
Chun-Yeow Yeoh33a45862013-10-17 15:55:18 -07001027 sdata_info(sdata,
1028 "mesh STA %pM switches to unsupported channel (%d MHz, width:%d, CF1/2: %d/%d MHz), aborting\n",
1029 sdata->vif.addr,
1030 params.chandef.chan->center_freq,
1031 params.chandef.width,
1032 params.chandef.center_freq1,
1033 params.chandef.center_freq2);
1034 return false;
1035 }
1036
1037 err = cfg80211_chandef_dfs_required(sdata->local->hw.wiphy,
Luciano Coelho2beb6dab2014-02-18 11:40:36 +02001038 &params.chandef,
1039 NL80211_IFTYPE_MESH_POINT);
Chun-Yeow Yeoh33a45862013-10-17 15:55:18 -07001040 if (err < 0)
1041 return false;
Benjamin Berg0ab2e55d2017-05-16 11:23:13 +02001042 if (err > 0 && !ifmsh->userspace_handles_dfs) {
1043 sdata_info(sdata,
1044 "mesh STA %pM switches to channel requiring DFS (%d MHz, width:%d, CF1/2: %d/%d MHz), aborting\n",
1045 sdata->vif.addr,
1046 params.chandef.chan->center_freq,
1047 params.chandef.width,
1048 params.chandef.center_freq1,
1049 params.chandef.center_freq2);
Chun-Yeow Yeoh33a45862013-10-17 15:55:18 -07001050 return false;
Benjamin Berg0ab2e55d2017-05-16 11:23:13 +02001051 }
Luciano Coelho2beb6dab2014-02-18 11:40:36 +02001052
1053 params.radar_required = err;
Chun-Yeow Yeoh33a45862013-10-17 15:55:18 -07001054
Luciano Coelho0cb4d4d2014-01-13 19:42:58 +02001055 if (cfg80211_chandef_identical(&params.chandef,
1056 &sdata->vif.bss_conf.chandef)) {
1057 mcsa_dbg(sdata,
1058 "received csa with an identical chandef, ignoring\n");
1059 return true;
1060 }
Chun-Yeow Yeoh33a45862013-10-17 15:55:18 -07001061
1062 mcsa_dbg(sdata,
1063 "received channel switch announcement to go to channel %d MHz\n",
1064 params.chandef.chan->center_freq);
1065
1066 params.block_tx = csa_ie.mode & WLAN_EID_CHAN_SWITCH_PARAM_TX_RESTRICT;
Chun-Yeow Yeoh3f718fd2013-11-08 15:09:43 +08001067 if (beacon) {
Chun-Yeow Yeoh33a45862013-10-17 15:55:18 -07001068 ifmsh->chsw_ttl = csa_ie.ttl - 1;
Chun-Yeow Yeoh3f718fd2013-11-08 15:09:43 +08001069 if (ifmsh->pre_value >= csa_ie.pre_value)
1070 return false;
1071 ifmsh->pre_value = csa_ie.pre_value;
1072 }
Chun-Yeow Yeoh33a45862013-10-17 15:55:18 -07001073
Luciano Coelho0cb4d4d2014-01-13 19:42:58 +02001074 if (ifmsh->chsw_ttl >= ifmsh->mshcfg.dot11MeshTTL)
Chun-Yeow Yeoh3f718fd2013-11-08 15:09:43 +08001075 return false;
Chun-Yeow Yeoh33a45862013-10-17 15:55:18 -07001076
Luciano Coelho0cb4d4d2014-01-13 19:42:58 +02001077 ifmsh->csa_role = IEEE80211_MESH_CSA_ROLE_REPEATER;
Chun-Yeow Yeoh33a45862013-10-17 15:55:18 -07001078
Luciano Coelho0cb4d4d2014-01-13 19:42:58 +02001079 if (ieee80211_channel_switch(sdata->local->hw.wiphy, sdata->dev,
1080 &params) < 0)
1081 return false;
Chun-Yeow Yeoh33a45862013-10-17 15:55:18 -07001082
1083 return true;
Chun-Yeow Yeoh33a45862013-10-17 15:55:18 -07001084}
1085
Thomas Pedersen9fb04b52013-02-14 11:20:14 -08001086static void
1087ieee80211_mesh_rx_probe_req(struct ieee80211_sub_if_data *sdata,
1088 struct ieee80211_mgmt *mgmt, size_t len)
1089{
1090 struct ieee80211_local *local = sdata->local;
1091 struct ieee80211_if_mesh *ifmsh = &sdata->u.mesh;
1092 struct sk_buff *presp;
1093 struct beacon_data *bcn;
1094 struct ieee80211_mgmt *hdr;
1095 struct ieee802_11_elems elems;
1096 size_t baselen;
Johannes Berg511044e2013-03-07 22:47:00 +01001097 u8 *pos;
Thomas Pedersen9fb04b52013-02-14 11:20:14 -08001098
Thomas Pedersen9fb04b52013-02-14 11:20:14 -08001099 pos = mgmt->u.probe_req.variable;
1100 baselen = (u8 *) pos - (u8 *) mgmt;
1101 if (baselen > len)
1102 return;
1103
Johannes Bergb2e506b2013-03-26 14:54:16 +01001104 ieee802_11_parse_elems(pos, len - baselen, false, &elems);
Thomas Pedersen9fb04b52013-02-14 11:20:14 -08001105
Chun-Yeow Yeoha4ef66a2013-08-22 10:28:58 -07001106 if (!elems.mesh_id)
1107 return;
1108
Thomas Pedersen9fb04b52013-02-14 11:20:14 -08001109 /* 802.11-2012 10.1.4.3.2 */
1110 if ((!ether_addr_equal(mgmt->da, sdata->vif.addr) &&
1111 !is_broadcast_ether_addr(mgmt->da)) ||
1112 elems.ssid_len != 0)
1113 return;
1114
1115 if (elems.mesh_id_len != 0 &&
1116 (elems.mesh_id_len != ifmsh->mesh_id_len ||
1117 memcmp(elems.mesh_id, ifmsh->mesh_id, ifmsh->mesh_id_len)))
1118 return;
1119
1120 rcu_read_lock();
1121 bcn = rcu_dereference(ifmsh->beacon);
1122
1123 if (!bcn)
1124 goto out;
1125
1126 presp = dev_alloc_skb(local->tx_headroom +
1127 bcn->head_len + bcn->tail_len);
1128 if (!presp)
1129 goto out;
1130
1131 skb_reserve(presp, local->tx_headroom);
1132 memcpy(skb_put(presp, bcn->head_len), bcn->head, bcn->head_len);
1133 memcpy(skb_put(presp, bcn->tail_len), bcn->tail, bcn->tail_len);
1134 hdr = (struct ieee80211_mgmt *) presp->data;
1135 hdr->frame_control = cpu_to_le16(IEEE80211_FTYPE_MGMT |
1136 IEEE80211_STYPE_PROBE_RESP);
1137 memcpy(hdr->da, mgmt->sa, ETH_ALEN);
Thomas Pedersen9fb04b52013-02-14 11:20:14 -08001138 IEEE80211_SKB_CB(presp)->flags |= IEEE80211_TX_INTFL_DONT_ENCRYPT;
1139 ieee80211_tx_skb(sdata, presp);
1140out:
1141 rcu_read_unlock();
1142}
1143
Johannes Berg472dbc42008-09-11 00:01:49 +02001144static void ieee80211_mesh_rx_bcn_presp(struct ieee80211_sub_if_data *sdata,
1145 u16 stype,
1146 struct ieee80211_mgmt *mgmt,
1147 size_t len,
1148 struct ieee80211_rx_status *rx_status)
1149{
Johannes Bergc6a1fa12008-10-07 12:04:32 +02001150 struct ieee80211_local *local = sdata->local;
Javier Cardonadbf498f2012-03-31 11:31:32 -07001151 struct ieee80211_if_mesh *ifmsh = &sdata->u.mesh;
Johannes Berg472dbc42008-09-11 00:01:49 +02001152 struct ieee802_11_elems elems;
1153 struct ieee80211_channel *channel;
Johannes Berg472dbc42008-09-11 00:01:49 +02001154 size_t baselen;
1155 int freq;
Johannes Berg57fbcce2016-04-12 15:56:15 +02001156 enum nl80211_band band = rx_status->band;
Johannes Berg472dbc42008-09-11 00:01:49 +02001157
1158 /* ignore ProbeResp to foreign address */
1159 if (stype == IEEE80211_STYPE_PROBE_RESP &&
Joe Perchesb203ca32012-05-08 18:56:52 +00001160 !ether_addr_equal(mgmt->da, sdata->vif.addr))
Johannes Berg472dbc42008-09-11 00:01:49 +02001161 return;
1162
1163 baselen = (u8 *) mgmt->u.probe_resp.variable - (u8 *) mgmt;
1164 if (baselen > len)
1165 return;
1166
1167 ieee802_11_parse_elems(mgmt->u.probe_resp.variable, len - baselen,
Johannes Bergb2e506b2013-03-26 14:54:16 +01001168 false, &elems);
Johannes Berg472dbc42008-09-11 00:01:49 +02001169
Thomas Pedersen9a90bc82012-10-20 19:03:10 -07001170 /* ignore non-mesh or secure / unsecure mismatch */
1171 if ((!elems.mesh_id || !elems.mesh_config) ||
1172 (elems.rsn && sdata->u.mesh.security == IEEE80211_MESH_SEC_NONE) ||
1173 (!elems.rsn && sdata->u.mesh.security != IEEE80211_MESH_SEC_NONE))
Javier Cardona5cff5e02011-04-07 15:08:29 -07001174 return;
1175
Johannes Berg1cd8e882013-03-27 14:30:12 +01001176 if (elems.ds_params)
Bruno Randolf59eb21a2011-01-17 13:37:28 +09001177 freq = ieee80211_channel_to_frequency(elems.ds_params[0], band);
Johannes Berg472dbc42008-09-11 00:01:49 +02001178 else
1179 freq = rx_status->freq;
1180
1181 channel = ieee80211_get_channel(local->hw.wiphy, freq);
1182
1183 if (!channel || channel->flags & IEEE80211_CHAN_DISABLED)
1184 return;
1185
Masashi Honmaed92a9b2017-03-16 10:57:18 +09001186 if (mesh_matches_local(sdata, &elems)) {
1187 mpl_dbg(sdata, "rssi_threshold=%d,rx_status->signal=%d\n",
1188 sdata->u.mesh.mshcfg.rssi_threshold, rx_status->signal);
1189 if (!sdata->u.mesh.user_mpm ||
1190 sdata->u.mesh.mshcfg.rssi_threshold == 0 ||
1191 sdata->u.mesh.mshcfg.rssi_threshold < rx_status->signal)
1192 mesh_neighbour_update(sdata, mgmt->sa, &elems);
1193 }
Javier Cardonadbf498f2012-03-31 11:31:32 -07001194
1195 if (ifmsh->sync_ops)
1196 ifmsh->sync_ops->rx_bcn_presp(sdata,
1197 stype, mgmt, &elems, rx_status);
Chun-Yeow Yeoh33a45862013-10-17 15:55:18 -07001198
Luciano Coelho0cb4d4d2014-01-13 19:42:58 +02001199 if (ifmsh->csa_role != IEEE80211_MESH_CSA_ROLE_INIT &&
1200 !sdata->vif.csa_active)
Chun-Yeow Yeoh33a45862013-10-17 15:55:18 -07001201 ieee80211_mesh_process_chnswitch(sdata, &elems, true);
Johannes Berg472dbc42008-09-11 00:01:49 +02001202}
1203
Chun-Yeow Yeohb8456a12013-10-17 15:55:02 -07001204int ieee80211_mesh_finish_csa(struct ieee80211_sub_if_data *sdata)
1205{
1206 struct ieee80211_if_mesh *ifmsh = &sdata->u.mesh;
1207 struct mesh_csa_settings *tmp_csa_settings;
1208 int ret = 0;
Michal Kaziorfaf046e2014-01-29 07:56:17 +01001209 int changed = 0;
Chun-Yeow Yeohb8456a12013-10-17 15:55:02 -07001210
1211 /* Reset the TTL value and Initiator flag */
Luciano Coelho0cb4d4d2014-01-13 19:42:58 +02001212 ifmsh->csa_role = IEEE80211_MESH_CSA_ROLE_NONE;
Chun-Yeow Yeohb8456a12013-10-17 15:55:02 -07001213 ifmsh->chsw_ttl = 0;
1214
1215 /* Remove the CSA and MCSP elements from the beacon */
1216 tmp_csa_settings = rcu_dereference(ifmsh->csa);
Monam Agarwal0c2bef462014-03-24 00:51:43 +05301217 RCU_INIT_POINTER(ifmsh->csa, NULL);
Luciano Coelho66e01cf2014-01-13 19:43:00 +02001218 if (tmp_csa_settings)
1219 kfree_rcu(tmp_csa_settings, rcu_head);
Chun-Yeow Yeohb8456a12013-10-17 15:55:02 -07001220 ret = ieee80211_mesh_rebuild_beacon(sdata);
1221 if (ret)
1222 return -EINVAL;
1223
Michal Kaziorfaf046e2014-01-29 07:56:17 +01001224 changed |= BSS_CHANGED_BEACON;
Chun-Yeow Yeohb8456a12013-10-17 15:55:02 -07001225
1226 mcsa_dbg(sdata, "complete switching to center freq %d MHz",
1227 sdata->vif.bss_conf.chandef.chan->center_freq);
Michal Kaziorfaf046e2014-01-29 07:56:17 +01001228 return changed;
Chun-Yeow Yeohb8456a12013-10-17 15:55:02 -07001229}
1230
1231int ieee80211_mesh_csa_beacon(struct ieee80211_sub_if_data *sdata,
Luciano Coelho66e01cf2014-01-13 19:43:00 +02001232 struct cfg80211_csa_settings *csa_settings)
Chun-Yeow Yeohb8456a12013-10-17 15:55:02 -07001233{
1234 struct ieee80211_if_mesh *ifmsh = &sdata->u.mesh;
1235 struct mesh_csa_settings *tmp_csa_settings;
1236 int ret = 0;
1237
1238 tmp_csa_settings = kmalloc(sizeof(*tmp_csa_settings),
1239 GFP_ATOMIC);
1240 if (!tmp_csa_settings)
1241 return -ENOMEM;
1242
1243 memcpy(&tmp_csa_settings->settings, csa_settings,
1244 sizeof(struct cfg80211_csa_settings));
1245
1246 rcu_assign_pointer(ifmsh->csa, tmp_csa_settings);
1247
1248 ret = ieee80211_mesh_rebuild_beacon(sdata);
1249 if (ret) {
1250 tmp_csa_settings = rcu_dereference(ifmsh->csa);
Monam Agarwal0c2bef462014-03-24 00:51:43 +05301251 RCU_INIT_POINTER(ifmsh->csa, NULL);
Chun-Yeow Yeohb8456a12013-10-17 15:55:02 -07001252 kfree_rcu(tmp_csa_settings, rcu_head);
1253 return ret;
1254 }
1255
Luciano Coelhob58e81e2014-01-13 19:42:59 +02001256 return BSS_CHANGED_BEACON;
Chun-Yeow Yeohb8456a12013-10-17 15:55:02 -07001257}
1258
Chun-Yeow Yeoh8f2535b2013-10-14 19:08:27 -07001259static int mesh_fwd_csa_frame(struct ieee80211_sub_if_data *sdata,
1260 struct ieee80211_mgmt *mgmt, size_t len)
1261{
1262 struct ieee80211_mgmt *mgmt_fwd;
1263 struct sk_buff *skb;
1264 struct ieee80211_local *local = sdata->local;
1265 u8 *pos = mgmt->u.action.u.chan_switch.variable;
1266 size_t offset_ttl;
1267
1268 skb = dev_alloc_skb(local->tx_headroom + len);
1269 if (!skb)
1270 return -ENOMEM;
1271 skb_reserve(skb, local->tx_headroom);
1272 mgmt_fwd = (struct ieee80211_mgmt *) skb_put(skb, len);
1273
1274 /* offset_ttl is based on whether the secondary channel
Antonio Ospiteb314c662014-06-04 14:03:49 +02001275 * offset is available or not. Subtract 1 from the mesh TTL
Chun-Yeow Yeoh8f2535b2013-10-14 19:08:27 -07001276 * and disable the initiator flag before forwarding.
1277 */
1278 offset_ttl = (len < 42) ? 7 : 10;
1279 *(pos + offset_ttl) -= 1;
1280 *(pos + offset_ttl + 1) &= ~WLAN_EID_CHAN_SWITCH_PARAM_INITIATOR;
1281
1282 memcpy(mgmt_fwd, mgmt, len);
1283 eth_broadcast_addr(mgmt_fwd->da);
1284 memcpy(mgmt_fwd->sa, sdata->vif.addr, ETH_ALEN);
1285 memcpy(mgmt_fwd->bssid, sdata->vif.addr, ETH_ALEN);
1286
1287 ieee80211_tx_skb(sdata, skb);
1288 return 0;
1289}
1290
1291static void mesh_rx_csa_frame(struct ieee80211_sub_if_data *sdata,
1292 struct ieee80211_mgmt *mgmt, size_t len)
1293{
1294 struct ieee80211_if_mesh *ifmsh = &sdata->u.mesh;
1295 struct ieee802_11_elems elems;
1296 u16 pre_value;
Chun-Yeow Yeoh33a45862013-10-17 15:55:18 -07001297 bool fwd_csa = true;
Chun-Yeow Yeoh8f2535b2013-10-14 19:08:27 -07001298 size_t baselen;
Chun-Yeow Yeoh3f718fd2013-11-08 15:09:43 +08001299 u8 *pos;
Chun-Yeow Yeoh8f2535b2013-10-14 19:08:27 -07001300
1301 if (mgmt->u.action.u.measurement.action_code !=
1302 WLAN_ACTION_SPCT_CHL_SWITCH)
1303 return;
1304
1305 pos = mgmt->u.action.u.chan_switch.variable;
1306 baselen = offsetof(struct ieee80211_mgmt,
1307 u.action.u.chan_switch.variable);
Simon Wunderlich3b237822017-05-16 11:23:16 +02001308 ieee802_11_parse_elems(pos, len - baselen, true, &elems);
Chun-Yeow Yeoh8f2535b2013-10-14 19:08:27 -07001309
Chun-Yeow Yeoh3f718fd2013-11-08 15:09:43 +08001310 ifmsh->chsw_ttl = elems.mesh_chansw_params_ie->mesh_ttl;
1311 if (!--ifmsh->chsw_ttl)
Chun-Yeow Yeoh8f2535b2013-10-14 19:08:27 -07001312 fwd_csa = false;
1313
1314 pre_value = le16_to_cpu(elems.mesh_chansw_params_ie->mesh_pre_value);
1315 if (ifmsh->pre_value >= pre_value)
1316 return;
1317
1318 ifmsh->pre_value = pre_value;
1319
Luciano Coelho0cb4d4d2014-01-13 19:42:58 +02001320 if (!sdata->vif.csa_active &&
1321 !ieee80211_mesh_process_chnswitch(sdata, &elems, false)) {
Chun-Yeow Yeoh33a45862013-10-17 15:55:18 -07001322 mcsa_dbg(sdata, "Failed to process CSA action frame");
1323 return;
1324 }
1325
Chun-Yeow Yeoh8f2535b2013-10-14 19:08:27 -07001326 /* forward or re-broadcast the CSA frame */
1327 if (fwd_csa) {
1328 if (mesh_fwd_csa_frame(sdata, mgmt, len) < 0)
1329 mcsa_dbg(sdata, "Failed to forward the CSA frame");
1330 }
Chun-Yeow Yeoh8f2535b2013-10-14 19:08:27 -07001331}
1332
Johannes Berg472dbc42008-09-11 00:01:49 +02001333static void ieee80211_mesh_rx_mgmt_action(struct ieee80211_sub_if_data *sdata,
1334 struct ieee80211_mgmt *mgmt,
1335 size_t len,
1336 struct ieee80211_rx_status *rx_status)
1337{
1338 switch (mgmt->u.action.category) {
Thomas Pedersen8db09852011-08-12 20:01:00 -07001339 case WLAN_CATEGORY_SELF_PROTECTED:
1340 switch (mgmt->u.action.u.self_prot.action_code) {
1341 case WLAN_SP_MESH_PEERING_OPEN:
1342 case WLAN_SP_MESH_PEERING_CLOSE:
1343 case WLAN_SP_MESH_PEERING_CONFIRM:
1344 mesh_rx_plink_frame(sdata, mgmt, len, rx_status);
1345 break;
1346 }
Johannes Berg472dbc42008-09-11 00:01:49 +02001347 break;
Thomas Pedersen25d49e42011-08-11 19:35:15 -07001348 case WLAN_CATEGORY_MESH_ACTION:
1349 if (mesh_action_is_path_sel(mgmt))
1350 mesh_rx_path_sel_frame(sdata, mgmt, len);
Johannes Berg472dbc42008-09-11 00:01:49 +02001351 break;
Chun-Yeow Yeoh8f2535b2013-10-14 19:08:27 -07001352 case WLAN_CATEGORY_SPECTRUM_MGMT:
1353 mesh_rx_csa_frame(sdata, mgmt, len);
1354 break;
Johannes Berg472dbc42008-09-11 00:01:49 +02001355 }
1356}
1357
Johannes Berg1fa57d02010-06-10 10:21:32 +02001358void ieee80211_mesh_rx_queued_mgmt(struct ieee80211_sub_if_data *sdata,
1359 struct sk_buff *skb)
Johannes Berg472dbc42008-09-11 00:01:49 +02001360{
1361 struct ieee80211_rx_status *rx_status;
Johannes Berg472dbc42008-09-11 00:01:49 +02001362 struct ieee80211_mgmt *mgmt;
1363 u16 stype;
1364
Thomas Pedersenecccd072013-06-10 13:17:21 -07001365 sdata_lock(sdata);
1366
1367 /* mesh already went down */
Johannes Berg1693d342014-01-22 10:08:57 +01001368 if (!sdata->u.mesh.mesh_id_len)
Thomas Pedersenecccd072013-06-10 13:17:21 -07001369 goto out;
1370
Johannes Bergf1d58c22009-06-17 13:13:00 +02001371 rx_status = IEEE80211_SKB_RXCB(skb);
Johannes Berg472dbc42008-09-11 00:01:49 +02001372 mgmt = (struct ieee80211_mgmt *) skb->data;
1373 stype = le16_to_cpu(mgmt->frame_control) & IEEE80211_FCTL_STYPE;
1374
1375 switch (stype) {
1376 case IEEE80211_STYPE_PROBE_RESP:
1377 case IEEE80211_STYPE_BEACON:
1378 ieee80211_mesh_rx_bcn_presp(sdata, stype, mgmt, skb->len,
1379 rx_status);
1380 break;
Thomas Pedersen9fb04b52013-02-14 11:20:14 -08001381 case IEEE80211_STYPE_PROBE_REQ:
1382 ieee80211_mesh_rx_probe_req(sdata, mgmt, skb->len);
1383 break;
Johannes Berg472dbc42008-09-11 00:01:49 +02001384 case IEEE80211_STYPE_ACTION:
1385 ieee80211_mesh_rx_mgmt_action(sdata, mgmt, skb->len, rx_status);
1386 break;
1387 }
Thomas Pedersenecccd072013-06-10 13:17:21 -07001388out:
1389 sdata_unlock(sdata);
Johannes Berg472dbc42008-09-11 00:01:49 +02001390}
1391
Thomas Pedersenf81a9de2013-06-13 15:54:41 -07001392static void mesh_bss_info_changed(struct ieee80211_sub_if_data *sdata)
1393{
1394 struct ieee80211_if_mesh *ifmsh = &sdata->u.mesh;
1395 u32 bit, changed = 0;
1396
1397 for_each_set_bit(bit, &ifmsh->mbss_changed,
1398 sizeof(changed) * BITS_PER_BYTE) {
1399 clear_bit(bit, &ifmsh->mbss_changed);
1400 changed |= BIT(bit);
1401 }
1402
1403 if (sdata->vif.bss_conf.enable_beacon &&
1404 (changed & (BSS_CHANGED_BEACON |
1405 BSS_CHANGED_HT |
1406 BSS_CHANGED_BASIC_RATES |
1407 BSS_CHANGED_BEACON_INT)))
1408 if (ieee80211_mesh_rebuild_beacon(sdata))
1409 return;
1410
1411 ieee80211_bss_info_change_notify(sdata, changed);
1412}
1413
Johannes Berg1fa57d02010-06-10 10:21:32 +02001414void ieee80211_mesh_work(struct ieee80211_sub_if_data *sdata)
Johannes Berg472dbc42008-09-11 00:01:49 +02001415{
Johannes Berg472dbc42008-09-11 00:01:49 +02001416 struct ieee80211_if_mesh *ifmsh = &sdata->u.mesh;
Johannes Berg472dbc42008-09-11 00:01:49 +02001417
Thomas Pedersenecccd072013-06-10 13:17:21 -07001418 sdata_lock(sdata);
1419
1420 /* mesh already went down */
Johannes Berg1693d342014-01-22 10:08:57 +01001421 if (!sdata->u.mesh.mesh_id_len)
Thomas Pedersenecccd072013-06-10 13:17:21 -07001422 goto out;
1423
Johannes Berg472dbc42008-09-11 00:01:49 +02001424 if (ifmsh->preq_queue_len &&
1425 time_after(jiffies,
1426 ifmsh->last_preq + msecs_to_jiffies(ifmsh->mshcfg.dot11MeshHWMPpreqMinInterval)))
1427 mesh_path_start_discovery(sdata);
1428
Javier Cardona18889232009-08-10 12:15:52 -07001429 if (test_and_clear_bit(MESH_WORK_HOUSEKEEPING, &ifmsh->wrkq_flags))
Johannes Bergbf7cd942013-02-15 14:40:31 +01001430 ieee80211_mesh_housekeeping(sdata);
Rui Pauloe304bfd2009-11-09 23:46:56 +00001431
1432 if (test_and_clear_bit(MESH_WORK_ROOT, &ifmsh->wrkq_flags))
1433 ieee80211_mesh_rootpath(sdata);
Javier Cardonadbf498f2012-03-31 11:31:32 -07001434
1435 if (test_and_clear_bit(MESH_WORK_DRIFT_ADJUST, &ifmsh->wrkq_flags))
Masashi Honma445cd452016-12-08 10:15:51 +09001436 mesh_sync_adjust_tsf(sdata);
Thomas Pedersenecccd072013-06-10 13:17:21 -07001437
Thomas Pedersenf81a9de2013-06-13 15:54:41 -07001438 if (test_and_clear_bit(MESH_WORK_MBSS_CHANGED, &ifmsh->wrkq_flags))
1439 mesh_bss_info_changed(sdata);
Thomas Pedersenecccd072013-06-10 13:17:21 -07001440out:
1441 sdata_unlock(sdata);
Johannes Berg472dbc42008-09-11 00:01:49 +02001442}
1443
Johannes Berg472dbc42008-09-11 00:01:49 +02001444
Johannes Berg902acc72008-02-23 15:17:19 +01001445void ieee80211_mesh_init_sdata(struct ieee80211_sub_if_data *sdata)
1446{
Johannes Berg472dbc42008-09-11 00:01:49 +02001447 struct ieee80211_if_mesh *ifmsh = &sdata->u.mesh;
Johannes Bergad2d2232012-12-14 14:34:25 +01001448 static u8 zero_addr[ETH_ALEN] = {};
Johannes Berg902acc72008-02-23 15:17:19 +01001449
Johannes Berg472dbc42008-09-11 00:01:49 +02001450 setup_timer(&ifmsh->housekeeping_timer,
1451 ieee80211_mesh_housekeeping_timer,
1452 (unsigned long) sdata);
Johannes Berg472dbc42008-09-11 00:01:49 +02001453
Johannes Berg472dbc42008-09-11 00:01:49 +02001454 ifmsh->accepting_plinks = true;
Johannes Berg472dbc42008-09-11 00:01:49 +02001455 atomic_set(&ifmsh->mpaths, 0);
Jasper Bryant-Greenef698d852008-08-03 12:04:37 +12001456 mesh_rmc_init(sdata);
Johannes Berg472dbc42008-09-11 00:01:49 +02001457 ifmsh->last_preq = jiffies;
Thomas Pedersendca7e942011-11-24 17:15:24 -08001458 ifmsh->next_perr = jiffies;
Luciano Coelho0cb4d4d2014-01-13 19:42:58 +02001459 ifmsh->csa_role = IEEE80211_MESH_CSA_ROLE_NONE;
Johannes Berg902acc72008-02-23 15:17:19 +01001460 /* Allocate all mesh structures when creating the first mesh interface. */
1461 if (!mesh_allocated)
1462 ieee80211s_init();
Bob Copeland2bdaf382016-02-28 20:03:56 -05001463
1464 mesh_pathtbl_init(sdata);
1465
Johannes Berg472dbc42008-09-11 00:01:49 +02001466 setup_timer(&ifmsh->mesh_path_timer,
Johannes Berg902acc72008-02-23 15:17:19 +01001467 ieee80211_mesh_path_timer,
1468 (unsigned long) sdata);
Rui Pauloe304bfd2009-11-09 23:46:56 +00001469 setup_timer(&ifmsh->mesh_path_root_timer,
1470 ieee80211_mesh_path_root_timer,
1471 (unsigned long) sdata);
Johannes Berg472dbc42008-09-11 00:01:49 +02001472 INIT_LIST_HEAD(&ifmsh->preq_queue.list);
Marco Porsch3f52b7e2013-01-30 18:14:08 +01001473 skb_queue_head_init(&ifmsh->ps.bc_buf);
Johannes Berg472dbc42008-09-11 00:01:49 +02001474 spin_lock_init(&ifmsh->mesh_preq_queue_lock);
Javier Cardonadbf498f2012-03-31 11:31:32 -07001475 spin_lock_init(&ifmsh->sync_offset_lock);
Thomas Pedersen2b5e1962013-02-14 11:20:13 -08001476 RCU_INIT_POINTER(ifmsh->beacon, NULL);
Johannes Bergad2d2232012-12-14 14:34:25 +01001477
1478 sdata->vif.bss_conf.bssid = zero_addr;
Johannes Berg472dbc42008-09-11 00:01:49 +02001479}
Bob Copeland0371a082016-03-26 11:27:18 -04001480
1481void ieee80211_mesh_teardown_sdata(struct ieee80211_sub_if_data *sdata)
1482{
1483 mesh_rmc_free(sdata);
1484 mesh_pathtbl_unregister(sdata);
1485}