blob: d4684242e78bf6de3145f6311dce342af6d47adc [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{
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
Johannes Berg4bf88532012-11-09 11:39:59 +010097 if (!cfg80211_chandef_compatible(&sdata->vif.bss_conf.chandef,
98 &sta_chan_def))
Johannes Bergbf7cd942013-02-15 14:40:31 +010099 return false;
Thomas Pedersen739522b2011-10-26 14:47:28 -0700100
101 return true;
Luis Carlos Cobo2e3c8732008-02-23 15:17:09 +0100102}
103
104/**
105 * mesh_peer_accepts_plinks - check if an mp is willing to establish peer links
106 *
107 * @ie: information elements of a management frame from the mesh peer
Luis Carlos Cobo2e3c8732008-02-23 15:17:09 +0100108 */
Jasper Bryant-Greenef698d852008-08-03 12:04:37 +1200109bool mesh_peer_accepts_plinks(struct ieee802_11_elems *ie)
Luis Carlos Cobo2e3c8732008-02-23 15:17:09 +0100110{
Rui Paulo136cfa22009-11-18 18:40:00 +0000111 return (ie->mesh_config->meshconf_cap &
Johannes Bergbf7cd942013-02-15 14:40:31 +0100112 IEEE80211_MESHCONF_CAPAB_ACCEPT_PLINKS) != 0;
Luis Carlos Cobo2e3c8732008-02-23 15:17:09 +0100113}
114
115/**
Ben Hutchings2c530402012-07-10 10:55:09 +0000116 * mesh_accept_plinks_update - update accepting_plink in local mesh beacons
Luis Carlos Cobo2e3c8732008-02-23 15:17:09 +0100117 *
Johannes Bergd0709a62008-02-25 16:27:46 +0100118 * @sdata: mesh interface in which mesh beacons are going to be updated
Marco Porschdf323812012-08-08 07:58:43 +0200119 *
120 * Returns: beacon changed flag if the beacon content changed.
Luis Carlos Cobo2e3c8732008-02-23 15:17:09 +0100121 */
Marco Porschdf323812012-08-08 07:58:43 +0200122u32 mesh_accept_plinks_update(struct ieee80211_sub_if_data *sdata)
Luis Carlos Cobo2e3c8732008-02-23 15:17:09 +0100123{
Luis Carlos Cobo2e3c8732008-02-23 15:17:09 +0100124 bool free_plinks;
Marco Porschdf323812012-08-08 07:58:43 +0200125 u32 changed = 0;
Luis Carlos Cobo2e3c8732008-02-23 15:17:09 +0100126
127 /* In case mesh_plink_free_count > 0 and mesh_plinktbl_capacity == 0,
128 * the mesh interface might be able to establish plinks with peers that
Luis Carlos Cobob4e08ea2008-02-29 15:46:08 -0800129 * are already on the table but are not on PLINK_ESTAB state. However,
130 * in general the mesh interface is not accepting peer link requests
131 * from new peers, and that must be reflected in the beacon
Luis Carlos Cobo2e3c8732008-02-23 15:17:09 +0100132 */
133 free_plinks = mesh_plink_availables(sdata);
134
Marco Porschdf323812012-08-08 07:58:43 +0200135 if (free_plinks != sdata->u.mesh.accepting_plinks) {
136 sdata->u.mesh.accepting_plinks = free_plinks;
137 changed = BSS_CHANGED_BEACON;
138 }
139
140 return changed;
Luis Carlos Cobo2e3c8732008-02-23 15:17:09 +0100141}
142
Thomas Pedersen45b50282013-02-06 10:17:21 -0800143/*
144 * mesh_sta_cleanup - clean up any mesh sta state
145 *
146 * @sta: mesh sta to clean up.
147 */
148void mesh_sta_cleanup(struct sta_info *sta)
149{
150 struct ieee80211_sub_if_data *sdata = sta->sdata;
151 u32 changed;
152
153 /*
154 * maybe userspace handles peer allocation and peering, but in either
155 * case the beacon is still generated by the kernel and we might need
156 * an update.
157 */
158 changed = mesh_accept_plinks_update(sdata);
Thomas Pedersena6dad6a2013-03-04 13:06:12 -0800159 if (!sdata->u.mesh.user_mpm) {
Thomas Pedersen45b50282013-02-06 10:17:21 -0800160 changed |= mesh_plink_deactivate(sta);
161 del_timer_sync(&sta->plink_timer);
162 }
163
Thomas Pedersenf81a9de2013-06-13 15:54:41 -0700164 if (changed)
Thomas Pedersen2b5e1962013-02-14 11:20:13 -0800165 ieee80211_mbss_info_change_notify(sdata, changed);
Thomas Pedersen45b50282013-02-06 10:17:21 -0800166}
167
Jasper Bryant-Greenef698d852008-08-03 12:04:37 +1200168int mesh_rmc_init(struct ieee80211_sub_if_data *sdata)
Luis Carlos Cobo2e3c8732008-02-23 15:17:09 +0100169{
Luis Carlos Cobo2e3c8732008-02-23 15:17:09 +0100170 int i;
171
Johannes Berg472dbc42008-09-11 00:01:49 +0200172 sdata->u.mesh.rmc = kmalloc(sizeof(struct mesh_rmc), GFP_KERNEL);
173 if (!sdata->u.mesh.rmc)
Luis Carlos Cobo2e3c8732008-02-23 15:17:09 +0100174 return -ENOMEM;
Johannes Berg472dbc42008-09-11 00:01:49 +0200175 sdata->u.mesh.rmc->idx_mask = RMC_BUCKETS - 1;
Luis Carlos Cobo2e3c8732008-02-23 15:17:09 +0100176 for (i = 0; i < RMC_BUCKETS; i++)
Thomas Pedersenb7cfcd12012-12-17 18:41:57 -0800177 INIT_LIST_HEAD(&sdata->u.mesh.rmc->bucket[i]);
Luis Carlos Cobo2e3c8732008-02-23 15:17:09 +0100178 return 0;
179}
180
Jasper Bryant-Greenef698d852008-08-03 12:04:37 +1200181void mesh_rmc_free(struct ieee80211_sub_if_data *sdata)
Luis Carlos Cobo2e3c8732008-02-23 15:17:09 +0100182{
Johannes Berg472dbc42008-09-11 00:01:49 +0200183 struct mesh_rmc *rmc = sdata->u.mesh.rmc;
Luis Carlos Cobo2e3c8732008-02-23 15:17:09 +0100184 struct rmc_entry *p, *n;
185 int i;
186
Johannes Berg472dbc42008-09-11 00:01:49 +0200187 if (!sdata->u.mesh.rmc)
Luis Carlos Cobo2e3c8732008-02-23 15:17:09 +0100188 return;
189
Johannes Bergbf7cd942013-02-15 14:40:31 +0100190 for (i = 0; i < RMC_BUCKETS; i++) {
Thomas Pedersenb7cfcd12012-12-17 18:41:57 -0800191 list_for_each_entry_safe(p, n, &rmc->bucket[i], list) {
Luis Carlos Cobo2e3c8732008-02-23 15:17:09 +0100192 list_del(&p->list);
193 kmem_cache_free(rm_cache, p);
194 }
Johannes Bergbf7cd942013-02-15 14:40:31 +0100195 }
Luis Carlos Cobo2e3c8732008-02-23 15:17:09 +0100196
197 kfree(rmc);
Johannes Berg472dbc42008-09-11 00:01:49 +0200198 sdata->u.mesh.rmc = NULL;
Luis Carlos Cobo2e3c8732008-02-23 15:17:09 +0100199}
200
201/**
202 * mesh_rmc_check - Check frame in recent multicast cache and add if absent.
203 *
Johannes Bergbf7cd942013-02-15 14:40:31 +0100204 * @sdata: interface
Luis Carlos Cobo2e3c8732008-02-23 15:17:09 +0100205 * @sa: source address
206 * @mesh_hdr: mesh_header
207 *
208 * Returns: 0 if the frame is not in the cache, nonzero otherwise.
209 *
210 * Checks using the source address and the mesh sequence number if we have
211 * received this frame lately. If the frame is not in the cache, it is added to
212 * it.
213 */
Johannes Bergbf7cd942013-02-15 14:40:31 +0100214int mesh_rmc_check(struct ieee80211_sub_if_data *sdata,
215 const u8 *sa, struct ieee80211s_hdr *mesh_hdr)
Luis Carlos Cobo2e3c8732008-02-23 15:17:09 +0100216{
Johannes Berg472dbc42008-09-11 00:01:49 +0200217 struct mesh_rmc *rmc = sdata->u.mesh.rmc;
Luis Carlos Cobo2e3c8732008-02-23 15:17:09 +0100218 u32 seqnum = 0;
219 int entries = 0;
220 u8 idx;
221 struct rmc_entry *p, *n;
222
223 /* Don't care about endianness since only match matters */
Luis Carlos Cobo51cedda2008-04-23 12:15:29 -0700224 memcpy(&seqnum, &mesh_hdr->seqnum, sizeof(mesh_hdr->seqnum));
225 idx = le32_to_cpu(mesh_hdr->seqnum) & rmc->idx_mask;
Thomas Pedersenb7cfcd12012-12-17 18:41:57 -0800226 list_for_each_entry_safe(p, n, &rmc->bucket[idx], list) {
Luis Carlos Cobo2e3c8732008-02-23 15:17:09 +0100227 ++entries;
228 if (time_after(jiffies, p->exp_time) ||
Johannes Bergbf7cd942013-02-15 14:40:31 +0100229 entries == RMC_QUEUE_MAX_LEN) {
Luis Carlos Cobo2e3c8732008-02-23 15:17:09 +0100230 list_del(&p->list);
231 kmem_cache_free(rm_cache, p);
232 --entries;
Johannes Bergbf7cd942013-02-15 14:40:31 +0100233 } else if ((seqnum == p->seqnum) && ether_addr_equal(sa, p->sa))
Luis Carlos Cobo2e3c8732008-02-23 15:17:09 +0100234 return -1;
235 }
236
237 p = kmem_cache_alloc(rm_cache, GFP_ATOMIC);
Joe Perchesd15b8452011-08-29 14:17:31 -0700238 if (!p)
Luis Carlos Cobo2e3c8732008-02-23 15:17:09 +0100239 return 0;
Joe Perchesd15b8452011-08-29 14:17:31 -0700240
Luis Carlos Cobo2e3c8732008-02-23 15:17:09 +0100241 p->seqnum = seqnum;
242 p->exp_time = jiffies + RMC_TIMEOUT;
243 memcpy(p->sa, sa, ETH_ALEN);
Thomas Pedersenb7cfcd12012-12-17 18:41:57 -0800244 list_add(&p->list, &rmc->bucket[idx]);
Luis Carlos Cobo2e3c8732008-02-23 15:17:09 +0100245 return 0;
246}
247
Johannes Bergbf7cd942013-02-15 14:40:31 +0100248int mesh_add_meshconf_ie(struct ieee80211_sub_if_data *sdata,
249 struct sk_buff *skb)
Thomas Pedersen082ebb02011-08-11 19:35:10 -0700250{
251 struct ieee80211_if_mesh *ifmsh = &sdata->u.mesh;
252 u8 *pos, neighbors;
253 u8 meshconf_len = sizeof(struct ieee80211_meshconf_ie);
254
255 if (skb_tailroom(skb) < 2 + meshconf_len)
256 return -ENOMEM;
257
258 pos = skb_put(skb, 2 + meshconf_len);
259 *pos++ = WLAN_EID_MESH_CONFIG;
260 *pos++ = meshconf_len;
261
Thomas Pedersen43552be2013-12-15 13:14:16 -0800262 /* save a pointer for quick updates in pre-tbtt */
263 ifmsh->meshconf_offset = pos - skb->data;
264
Thomas Pedersen082ebb02011-08-11 19:35:10 -0700265 /* Active path selection protocol ID */
266 *pos++ = ifmsh->mesh_pp_id;
267 /* Active path selection metric ID */
268 *pos++ = ifmsh->mesh_pm_id;
269 /* Congestion control mode identifier */
270 *pos++ = ifmsh->mesh_cc_id;
271 /* Synchronization protocol identifier */
272 *pos++ = ifmsh->mesh_sp_id;
273 /* Authentication Protocol identifier */
274 *pos++ = ifmsh->mesh_auth_id;
275 /* Mesh Formation Info - number of neighbors */
Ashok Nagarajan1258d972012-10-09 13:27:47 -0700276 neighbors = atomic_read(&ifmsh->estab_plinks);
Jacob Minshalle05eccc2013-05-29 14:32:36 -0700277 neighbors = min_t(int, neighbors, IEEE80211_MAX_MESH_PEERINGS);
Thomas Pedersen082ebb02011-08-11 19:35:10 -0700278 *pos++ = neighbors << 1;
279 /* Mesh capability */
Chun-Yeow Yeohb60e5272013-07-12 18:55:22 +0800280 *pos = 0x00;
281 *pos |= ifmsh->mshcfg.dot11MeshForwarding ?
282 IEEE80211_MESHCONF_CAPAB_FORWARDING : 0x00;
Javier Cardonadbf498f2012-03-31 11:31:32 -0700283 *pos |= ifmsh->accepting_plinks ?
Johannes Bergbf7cd942013-02-15 14:40:31 +0100284 IEEE80211_MESHCONF_CAPAB_ACCEPT_PLINKS : 0x00;
Marco Porsch3f52b7e2013-01-30 18:14:08 +0100285 /* Mesh PS mode. See IEEE802.11-2012 8.4.2.100.8 */
286 *pos |= ifmsh->ps_peers_deep_sleep ?
Johannes Bergbf7cd942013-02-15 14:40:31 +0100287 IEEE80211_MESHCONF_CAPAB_POWER_SAVE_LEVEL : 0x00;
Javier Cardonadbf498f2012-03-31 11:31:32 -0700288 *pos++ |= ifmsh->adjusting_tbtt ?
Johannes Bergbf7cd942013-02-15 14:40:31 +0100289 IEEE80211_MESHCONF_CAPAB_TBTT_ADJUSTING : 0x00;
Thomas Pedersen082ebb02011-08-11 19:35:10 -0700290 *pos++ = 0x00;
291
292 return 0;
293}
294
Johannes Bergbf7cd942013-02-15 14:40:31 +0100295int mesh_add_meshid_ie(struct ieee80211_sub_if_data *sdata, struct sk_buff *skb)
Thomas Pedersen082ebb02011-08-11 19:35:10 -0700296{
297 struct ieee80211_if_mesh *ifmsh = &sdata->u.mesh;
298 u8 *pos;
299
300 if (skb_tailroom(skb) < 2 + ifmsh->mesh_id_len)
301 return -ENOMEM;
302
303 pos = skb_put(skb, 2 + ifmsh->mesh_id_len);
304 *pos++ = WLAN_EID_MESH_ID;
305 *pos++ = ifmsh->mesh_id_len;
306 if (ifmsh->mesh_id_len)
307 memcpy(pos, ifmsh->mesh_id, ifmsh->mesh_id_len);
308
309 return 0;
310}
311
Johannes Bergbf7cd942013-02-15 14:40:31 +0100312static int mesh_add_awake_window_ie(struct ieee80211_sub_if_data *sdata,
313 struct sk_buff *skb)
Marco Porsch3f52b7e2013-01-30 18:14:08 +0100314{
315 struct ieee80211_if_mesh *ifmsh = &sdata->u.mesh;
316 u8 *pos;
317
318 /* see IEEE802.11-2012 13.14.6 */
319 if (ifmsh->ps_peers_light_sleep == 0 &&
320 ifmsh->ps_peers_deep_sleep == 0 &&
321 ifmsh->nonpeer_pm == NL80211_MESH_POWER_ACTIVE)
322 return 0;
323
324 if (skb_tailroom(skb) < 4)
325 return -ENOMEM;
326
327 pos = skb_put(skb, 2 + 2);
328 *pos++ = WLAN_EID_MESH_AWAKE_WINDOW;
329 *pos++ = 2;
330 put_unaligned_le16(ifmsh->mshcfg.dot11MeshAwakeWindowDuration, pos);
331
332 return 0;
333}
334
Johannes Bergbf7cd942013-02-15 14:40:31 +0100335int mesh_add_vendor_ies(struct ieee80211_sub_if_data *sdata,
336 struct sk_buff *skb)
Thomas Pedersen082ebb02011-08-11 19:35:10 -0700337{
338 struct ieee80211_if_mesh *ifmsh = &sdata->u.mesh;
339 u8 offset, len;
340 const u8 *data;
341
342 if (!ifmsh->ie || !ifmsh->ie_len)
343 return 0;
344
345 /* fast-forward to vendor IEs */
346 offset = ieee80211_ie_split_vendor(ifmsh->ie, ifmsh->ie_len, 0);
347
348 if (offset) {
349 len = ifmsh->ie_len - offset;
350 data = ifmsh->ie + offset;
351 if (skb_tailroom(skb) < len)
352 return -ENOMEM;
353 memcpy(skb_put(skb, len), data, len);
354 }
355
356 return 0;
357}
358
Johannes Bergbf7cd942013-02-15 14:40:31 +0100359int mesh_add_rsn_ie(struct ieee80211_sub_if_data *sdata, struct sk_buff *skb)
Thomas Pedersen082ebb02011-08-11 19:35:10 -0700360{
361 struct ieee80211_if_mesh *ifmsh = &sdata->u.mesh;
362 u8 len = 0;
363 const u8 *data;
364
365 if (!ifmsh->ie || !ifmsh->ie_len)
366 return 0;
367
368 /* find RSN IE */
Bob Copelanda40a8c12014-04-15 10:43:07 -0400369 data = cfg80211_find_ie(WLAN_EID_RSN, ifmsh->ie, ifmsh->ie_len);
370 if (!data)
371 return 0;
Thomas Pedersen082ebb02011-08-11 19:35:10 -0700372
Bob Copelanda40a8c12014-04-15 10:43:07 -0400373 len = data[1] + 2;
374
375 if (skb_tailroom(skb) < len)
376 return -ENOMEM;
377 memcpy(skb_put(skb, len), data, len);
Thomas Pedersen082ebb02011-08-11 19:35:10 -0700378
379 return 0;
380}
381
Johannes Bergbf7cd942013-02-15 14:40:31 +0100382static int mesh_add_ds_params_ie(struct ieee80211_sub_if_data *sdata,
383 struct sk_buff *skb)
Thomas Pedersen082ebb02011-08-11 19:35:10 -0700384{
Johannes Berg55de9082012-07-26 17:24:39 +0200385 struct ieee80211_chanctx_conf *chanctx_conf;
386 struct ieee80211_channel *chan;
Thomas Pedersen082ebb02011-08-11 19:35:10 -0700387 u8 *pos;
388
389 if (skb_tailroom(skb) < 3)
390 return -ENOMEM;
391
Johannes Berg55de9082012-07-26 17:24:39 +0200392 rcu_read_lock();
393 chanctx_conf = rcu_dereference(sdata->vif.chanctx_conf);
394 if (WARN_ON(!chanctx_conf)) {
395 rcu_read_unlock();
396 return -EINVAL;
397 }
Johannes Berg4bf88532012-11-09 11:39:59 +0100398 chan = chanctx_conf->def.chan;
Johannes Berg55de9082012-07-26 17:24:39 +0200399 rcu_read_unlock();
400
Emanuel Taube601513a2013-02-06 14:17:17 +0100401 pos = skb_put(skb, 2 + 1);
402 *pos++ = WLAN_EID_DS_PARAMS;
403 *pos++ = 1;
404 *pos++ = ieee80211_frequency_to_channel(chan->center_freq);
Rui Paulobe125c62009-11-09 23:46:54 +0000405
Thomas Pedersen082ebb02011-08-11 19:35:10 -0700406 return 0;
Luis Carlos Cobo2e3c8732008-02-23 15:17:09 +0100407}
408
Johannes Bergbf7cd942013-02-15 14:40:31 +0100409int mesh_add_ht_cap_ie(struct ieee80211_sub_if_data *sdata,
410 struct sk_buff *skb)
Thomas Pedersen176f3602011-10-26 14:47:27 -0700411{
412 struct ieee80211_local *local = sdata->local;
Johannes Berg55de9082012-07-26 17:24:39 +0200413 enum ieee80211_band band = ieee80211_get_sdata_band(sdata);
Thomas Pedersen176f3602011-10-26 14:47:27 -0700414 struct ieee80211_supported_band *sband;
415 u8 *pos;
416
Johannes Berg55de9082012-07-26 17:24:39 +0200417 sband = local->hw.wiphy->bands[band];
Thomas Pedersen176f3602011-10-26 14:47:27 -0700418 if (!sband->ht_cap.ht_supported ||
Simon Wunderlich0418a442013-05-16 13:00:31 +0200419 sdata->vif.bss_conf.chandef.width == NL80211_CHAN_WIDTH_20_NOHT ||
420 sdata->vif.bss_conf.chandef.width == NL80211_CHAN_WIDTH_5 ||
421 sdata->vif.bss_conf.chandef.width == NL80211_CHAN_WIDTH_10)
Thomas Pedersen176f3602011-10-26 14:47:27 -0700422 return 0;
423
424 if (skb_tailroom(skb) < 2 + sizeof(struct ieee80211_ht_cap))
425 return -ENOMEM;
426
427 pos = skb_put(skb, 2 + sizeof(struct ieee80211_ht_cap));
Ben Greearef96a8422011-11-18 11:32:00 -0800428 ieee80211_ie_build_ht_cap(pos, &sband->ht_cap, sband->ht_cap.cap);
Thomas Pedersen176f3602011-10-26 14:47:27 -0700429
430 return 0;
431}
432
Johannes Bergbf7cd942013-02-15 14:40:31 +0100433int mesh_add_ht_oper_ie(struct ieee80211_sub_if_data *sdata,
434 struct sk_buff *skb)
Thomas Pedersen176f3602011-10-26 14:47:27 -0700435{
436 struct ieee80211_local *local = sdata->local;
Johannes Berg55de9082012-07-26 17:24:39 +0200437 struct ieee80211_chanctx_conf *chanctx_conf;
438 struct ieee80211_channel *channel;
Johannes Berg466f3102012-07-25 13:51:49 +0200439 enum nl80211_channel_type channel_type =
Johannes Berg4bf88532012-11-09 11:39:59 +0100440 cfg80211_get_chandef_type(&sdata->vif.bss_conf.chandef);
Johannes Berg55de9082012-07-26 17:24:39 +0200441 struct ieee80211_supported_band *sband;
442 struct ieee80211_sta_ht_cap *ht_cap;
Thomas Pedersen176f3602011-10-26 14:47:27 -0700443 u8 *pos;
444
Johannes Berg55de9082012-07-26 17:24:39 +0200445 rcu_read_lock();
446 chanctx_conf = rcu_dereference(sdata->vif.chanctx_conf);
447 if (WARN_ON(!chanctx_conf)) {
448 rcu_read_unlock();
449 return -EINVAL;
450 }
Johannes Berg4bf88532012-11-09 11:39:59 +0100451 channel = chanctx_conf->def.chan;
Johannes Berg55de9082012-07-26 17:24:39 +0200452 rcu_read_unlock();
453
454 sband = local->hw.wiphy->bands[channel->band];
455 ht_cap = &sband->ht_cap;
456
Thomas Pedersen176f3602011-10-26 14:47:27 -0700457 if (!ht_cap->ht_supported || channel_type == NL80211_CHAN_NO_HT)
458 return 0;
459
Johannes Berg074d46d2012-03-15 19:45:16 +0100460 if (skb_tailroom(skb) < 2 + sizeof(struct ieee80211_ht_operation))
Thomas Pedersen176f3602011-10-26 14:47:27 -0700461 return -ENOMEM;
462
Johannes Berg074d46d2012-03-15 19:45:16 +0100463 pos = skb_put(skb, 2 + sizeof(struct ieee80211_ht_operation));
Johannes Berg4bf88532012-11-09 11:39:59 +0100464 ieee80211_ie_build_ht_oper(pos, ht_cap, &sdata->vif.bss_conf.chandef,
Ashok Nagarajan431e3152012-04-30 14:20:29 -0700465 sdata->vif.bss_conf.ht_operation_mode);
Thomas Pedersen176f3602011-10-26 14:47:27 -0700466
467 return 0;
468}
Johannes Bergbf7cd942013-02-15 14:40:31 +0100469
Luis Carlos Cobo2e3c8732008-02-23 15:17:09 +0100470static void ieee80211_mesh_path_timer(unsigned long data)
471{
472 struct ieee80211_sub_if_data *sdata =
473 (struct ieee80211_sub_if_data *) data;
Luis Carlos Cobo2e3c8732008-02-23 15:17:09 +0100474
Stanislaw Gruszka690205f2013-02-28 10:55:29 +0100475 ieee80211_queue_work(&sdata->local->hw, &sdata->work);
Luis Carlos Cobo2e3c8732008-02-23 15:17:09 +0100476}
477
Rui Pauloe304bfd2009-11-09 23:46:56 +0000478static void ieee80211_mesh_path_root_timer(unsigned long data)
479{
480 struct ieee80211_sub_if_data *sdata =
481 (struct ieee80211_sub_if_data *) data;
482 struct ieee80211_if_mesh *ifmsh = &sdata->u.mesh;
Rui Pauloe304bfd2009-11-09 23:46:56 +0000483
484 set_bit(MESH_WORK_ROOT, &ifmsh->wrkq_flags);
485
Stanislaw Gruszka690205f2013-02-28 10:55:29 +0100486 ieee80211_queue_work(&sdata->local->hw, &sdata->work);
Rui Pauloe304bfd2009-11-09 23:46:56 +0000487}
488
Rui Paulo63c57232009-11-09 23:46:57 +0000489void ieee80211_mesh_root_setup(struct ieee80211_if_mesh *ifmsh)
490{
Chun-Yeow Yeohdbb912c2012-06-14 02:06:09 +0800491 if (ifmsh->mshcfg.dot11MeshHWMPRootMode > IEEE80211_ROOTMODE_ROOT)
Rui Paulo63c57232009-11-09 23:46:57 +0000492 set_bit(MESH_WORK_ROOT, &ifmsh->wrkq_flags);
493 else {
494 clear_bit(MESH_WORK_ROOT, &ifmsh->wrkq_flags);
495 /* stop running timer */
496 del_timer_sync(&ifmsh->mesh_path_root_timer);
497 }
498}
499
Johannes Berg902acc72008-02-23 15:17:19 +0100500/**
Javier Cardona3c5772a2009-08-10 12:15:48 -0700501 * ieee80211_fill_mesh_addresses - fill addresses of a locally originated mesh frame
Johannes Bergbf7cd942013-02-15 14:40:31 +0100502 * @hdr: 802.11 frame header
Javier Cardona3c5772a2009-08-10 12:15:48 -0700503 * @fc: frame control field
504 * @meshda: destination address in the mesh
505 * @meshsa: source address address in the mesh. Same as TA, as frame is
506 * locally originated.
507 *
508 * Return the length of the 802.11 (does not include a mesh control header)
509 */
Johannes Berg15ff6362009-11-17 13:34:04 +0100510int ieee80211_fill_mesh_addresses(struct ieee80211_hdr *hdr, __le16 *fc,
511 const u8 *meshda, const u8 *meshsa)
512{
Javier Cardona3c5772a2009-08-10 12:15:48 -0700513 if (is_multicast_ether_addr(meshda)) {
514 *fc |= cpu_to_le16(IEEE80211_FCTL_FROMDS);
515 /* DA TA SA */
516 memcpy(hdr->addr1, meshda, ETH_ALEN);
517 memcpy(hdr->addr2, meshsa, ETH_ALEN);
518 memcpy(hdr->addr3, meshsa, ETH_ALEN);
519 return 24;
520 } else {
Javier Cardona2154c812011-09-07 17:49:53 -0700521 *fc |= cpu_to_le16(IEEE80211_FCTL_FROMDS | IEEE80211_FCTL_TODS);
Javier Cardona3c5772a2009-08-10 12:15:48 -0700522 /* RA TA DA SA */
Joe Perchesc84a67a2015-03-02 19:54:57 -0800523 eth_zero_addr(hdr->addr1); /* RA is resolved later */
Javier Cardona3c5772a2009-08-10 12:15:48 -0700524 memcpy(hdr->addr2, meshsa, ETH_ALEN);
525 memcpy(hdr->addr3, meshda, ETH_ALEN);
526 memcpy(hdr->addr4, meshsa, ETH_ALEN);
527 return 30;
528 }
529}
530
531/**
Johannes Berg902acc72008-02-23 15:17:19 +0100532 * ieee80211_new_mesh_header - create a new mesh header
Johannes Berg902acc72008-02-23 15:17:19 +0100533 * @sdata: mesh interface to be used
Johannes Bergbf7cd942013-02-15 14:40:31 +0100534 * @meshhdr: uninitialized mesh header
Javier Cardona61ad5392010-12-16 17:23:34 -0800535 * @addr4or5: 1st address in the ae header, which may correspond to address 4
536 * (if addr6 is NULL) or address 5 (if addr6 is present). It may
537 * be NULL.
538 * @addr6: 2nd address in the ae header, which corresponds to addr6 of the
539 * mesh frame
Johannes Berg902acc72008-02-23 15:17:19 +0100540 *
541 * Return the header length.
542 */
Johannes Bergbf7cd942013-02-15 14:40:31 +0100543int ieee80211_new_mesh_header(struct ieee80211_sub_if_data *sdata,
544 struct ieee80211s_hdr *meshhdr,
545 const char *addr4or5, const char *addr6)
Johannes Berg902acc72008-02-23 15:17:19 +0100546{
Johannes Bergbf7cd942013-02-15 14:40:31 +0100547 if (WARN_ON(!addr4or5 && addr6))
548 return 0;
549
Julia Lawall0c3cee72009-12-09 20:25:59 +0100550 memset(meshhdr, 0, sizeof(*meshhdr));
Johannes Bergbf7cd942013-02-15 14:40:31 +0100551
Johannes Berg472dbc42008-09-11 00:01:49 +0200552 meshhdr->ttl = sdata->u.mesh.mshcfg.dot11MeshTTL;
Johannes Bergbf7cd942013-02-15 14:40:31 +0100553
554 /* FIXME: racy -- TX on multiple queues can be concurrent */
Johannes Berg472dbc42008-09-11 00:01:49 +0200555 put_unaligned(cpu_to_le32(sdata->u.mesh.mesh_seqnum), &meshhdr->seqnum);
556 sdata->u.mesh.mesh_seqnum++;
Johannes Bergbf7cd942013-02-15 14:40:31 +0100557
Javier Cardona61ad5392010-12-16 17:23:34 -0800558 if (addr4or5 && !addr6) {
Javier Cardona3c5772a2009-08-10 12:15:48 -0700559 meshhdr->flags |= MESH_FLAGS_AE_A4;
Javier Cardona61ad5392010-12-16 17:23:34 -0800560 memcpy(meshhdr->eaddr1, addr4or5, ETH_ALEN);
Johannes Bergbf7cd942013-02-15 14:40:31 +0100561 return 2 * ETH_ALEN;
Javier Cardona61ad5392010-12-16 17:23:34 -0800562 } else if (addr4or5 && addr6) {
Javier Cardona3c5772a2009-08-10 12:15:48 -0700563 meshhdr->flags |= MESH_FLAGS_AE_A5_A6;
Javier Cardona61ad5392010-12-16 17:23:34 -0800564 memcpy(meshhdr->eaddr1, addr4or5, ETH_ALEN);
565 memcpy(meshhdr->eaddr2, addr6, ETH_ALEN);
Johannes Bergbf7cd942013-02-15 14:40:31 +0100566 return 3 * ETH_ALEN;
Javier Cardona3c5772a2009-08-10 12:15:48 -0700567 }
Johannes Bergbf7cd942013-02-15 14:40:31 +0100568
569 return ETH_ALEN;
Johannes Berg902acc72008-02-23 15:17:19 +0100570}
571
Johannes Bergbf7cd942013-02-15 14:40:31 +0100572static void ieee80211_mesh_housekeeping(struct ieee80211_sub_if_data *sdata)
Johannes Berg472dbc42008-09-11 00:01:49 +0200573{
Johannes Bergbf7cd942013-02-15 14:40:31 +0100574 struct ieee80211_if_mesh *ifmsh = &sdata->u.mesh;
Marco Porschdf323812012-08-08 07:58:43 +0200575 u32 changed;
Johannes Berg472dbc42008-09-11 00:01:49 +0200576
Masashi Honma31f909a2015-02-24 22:42:16 +0900577 if (ifmsh->mshcfg.plink_timeout > 0)
578 ieee80211_sta_expire(sdata, ifmsh->mshcfg.plink_timeout * HZ);
Johannes Berg472dbc42008-09-11 00:01:49 +0200579 mesh_path_expire(sdata);
580
Marco Porschdf323812012-08-08 07:58:43 +0200581 changed = mesh_accept_plinks_update(sdata);
Thomas Pedersen2b5e1962013-02-14 11:20:13 -0800582 ieee80211_mbss_info_change_notify(sdata, changed);
Johannes Berg472dbc42008-09-11 00:01:49 +0200583
Johannes Berg472dbc42008-09-11 00:01:49 +0200584 mod_timer(&ifmsh->housekeeping_timer,
Johannes Bergbf7cd942013-02-15 14:40:31 +0100585 round_jiffies(jiffies +
586 IEEE80211_MESH_HOUSEKEEPING_INTERVAL));
Johannes Berg472dbc42008-09-11 00:01:49 +0200587}
588
Rui Pauloe304bfd2009-11-09 23:46:56 +0000589static void ieee80211_mesh_rootpath(struct ieee80211_sub_if_data *sdata)
590{
591 struct ieee80211_if_mesh *ifmsh = &sdata->u.mesh;
Chun-Yeow Yeoha69cc442012-06-14 02:06:07 +0800592 u32 interval;
Rui Pauloe304bfd2009-11-09 23:46:56 +0000593
594 mesh_path_tx_root_frame(sdata);
Chun-Yeow Yeoha69cc442012-06-14 02:06:07 +0800595
596 if (ifmsh->mshcfg.dot11MeshHWMPRootMode == IEEE80211_PROACTIVE_RANN)
597 interval = ifmsh->mshcfg.dot11MeshHWMPRannInterval;
598 else
599 interval = ifmsh->mshcfg.dot11MeshHWMProotInterval;
600
Rui Pauloe304bfd2009-11-09 23:46:56 +0000601 mod_timer(&ifmsh->mesh_path_root_timer,
Chun-Yeow Yeoha69cc442012-06-14 02:06:07 +0800602 round_jiffies(TU_TO_EXP_TIME(interval)));
Rui Pauloe304bfd2009-11-09 23:46:56 +0000603}
604
Thomas Pedersen2b5e1962013-02-14 11:20:13 -0800605static int
606ieee80211_mesh_build_beacon(struct ieee80211_if_mesh *ifmsh)
607{
608 struct beacon_data *bcn;
609 int head_len, tail_len;
610 struct sk_buff *skb;
611 struct ieee80211_mgmt *mgmt;
612 struct ieee80211_chanctx_conf *chanctx_conf;
Chun-Yeow Yeohb8456a12013-10-17 15:55:02 -0700613 struct mesh_csa_settings *csa;
Thomas Pedersen2b5e1962013-02-14 11:20:13 -0800614 enum ieee80211_band band;
615 u8 *pos;
616 struct ieee80211_sub_if_data *sdata;
617 int hdr_len = offsetof(struct ieee80211_mgmt, u.beacon) +
618 sizeof(mgmt->u.beacon);
619
620 sdata = container_of(ifmsh, struct ieee80211_sub_if_data, u.mesh);
621 rcu_read_lock();
622 chanctx_conf = rcu_dereference(sdata->vif.chanctx_conf);
623 band = chanctx_conf->def.chan->band;
624 rcu_read_unlock();
625
626 head_len = hdr_len +
627 2 + /* NULL SSID */
Chun-Yeow Yeohb8456a12013-10-17 15:55:02 -0700628 /* Channel Switch Announcement */
629 2 + sizeof(struct ieee80211_channel_sw_ie) +
630 /* Mesh Channel Swith Parameters */
631 2 + sizeof(struct ieee80211_mesh_chansw_params_ie) +
Thomas Pedersen2b5e1962013-02-14 11:20:13 -0800632 2 + 8 + /* supported rates */
633 2 + 3; /* DS params */
634 tail_len = 2 + (IEEE80211_MAX_SUPP_RATES - 8) +
635 2 + sizeof(struct ieee80211_ht_cap) +
636 2 + sizeof(struct ieee80211_ht_operation) +
637 2 + ifmsh->mesh_id_len +
638 2 + sizeof(struct ieee80211_meshconf_ie) +
639 2 + sizeof(__le16) + /* awake window */
640 ifmsh->ie_len;
641
642 bcn = kzalloc(sizeof(*bcn) + head_len + tail_len, GFP_KERNEL);
643 /* need an skb for IE builders to operate on */
644 skb = dev_alloc_skb(max(head_len, tail_len));
645
646 if (!bcn || !skb)
647 goto out_free;
648
649 /*
650 * pointers go into the block we allocated,
651 * memory is | beacon_data | head | tail |
652 */
653 bcn->head = ((u8 *) bcn) + sizeof(*bcn);
654
655 /* fill in the head */
656 mgmt = (struct ieee80211_mgmt *) skb_put(skb, hdr_len);
657 memset(mgmt, 0, hdr_len);
658 mgmt->frame_control = cpu_to_le16(IEEE80211_FTYPE_MGMT |
659 IEEE80211_STYPE_BEACON);
660 eth_broadcast_addr(mgmt->da);
661 memcpy(mgmt->sa, sdata->vif.addr, ETH_ALEN);
662 memcpy(mgmt->bssid, sdata->vif.addr, ETH_ALEN);
663 ieee80211_mps_set_frame_flags(sdata, NULL, (void *) mgmt);
664 mgmt->u.beacon.beacon_int =
665 cpu_to_le16(sdata->vif.bss_conf.beacon_int);
666 mgmt->u.beacon.capab_info |= cpu_to_le16(
667 sdata->u.mesh.security ? WLAN_CAPABILITY_PRIVACY : 0);
668
669 pos = skb_put(skb, 2);
670 *pos++ = WLAN_EID_SSID;
671 *pos++ = 0x0;
672
Chun-Yeow Yeohb8456a12013-10-17 15:55:02 -0700673 rcu_read_lock();
674 csa = rcu_dereference(ifmsh->csa);
675 if (csa) {
Chun-Yeow Yeohb8456a12013-10-17 15:55:02 -0700676 pos = skb_put(skb, 13);
677 memset(pos, 0, 13);
678 *pos++ = WLAN_EID_CHANNEL_SWITCH;
679 *pos++ = 3;
680 *pos++ = 0x0;
681 *pos++ = ieee80211_frequency_to_channel(
682 csa->settings.chandef.chan->center_freq);
Michal Kazioraf296bd2014-06-05 14:21:36 +0200683 bcn->csa_counter_offsets[0] = hdr_len + 6;
Chun-Yeow Yeohb8456a12013-10-17 15:55:02 -0700684 *pos++ = csa->settings.count;
685 *pos++ = WLAN_EID_CHAN_SWITCH_PARAM;
686 *pos++ = 6;
Luciano Coelho0cb4d4d2014-01-13 19:42:58 +0200687 if (ifmsh->csa_role == IEEE80211_MESH_CSA_ROLE_INIT) {
Chun-Yeow Yeohb8456a12013-10-17 15:55:02 -0700688 *pos++ = ifmsh->mshcfg.dot11MeshTTL;
689 *pos |= WLAN_EID_CHAN_SWITCH_PARAM_INITIATOR;
690 } else {
691 *pos++ = ifmsh->chsw_ttl;
692 }
693 *pos++ |= csa->settings.block_tx ?
694 WLAN_EID_CHAN_SWITCH_PARAM_TX_RESTRICT : 0x00;
695 put_unaligned_le16(WLAN_REASON_MESH_CHAN, pos);
696 pos += 2;
Chun-Yeow Yeohca91dc92013-11-12 10:31:48 +0800697 put_unaligned_le16(ifmsh->pre_value, pos);
Chun-Yeow Yeohb8456a12013-10-17 15:55:02 -0700698 pos += 2;
699 }
700 rcu_read_unlock();
701
Thomas Pedersen2b5e1962013-02-14 11:20:13 -0800702 if (ieee80211_add_srates_ie(sdata, skb, true, band) ||
Johannes Bergbf7cd942013-02-15 14:40:31 +0100703 mesh_add_ds_params_ie(sdata, skb))
Thomas Pedersen2b5e1962013-02-14 11:20:13 -0800704 goto out_free;
705
706 bcn->head_len = skb->len;
707 memcpy(bcn->head, skb->data, bcn->head_len);
708
709 /* now the tail */
710 skb_trim(skb, 0);
711 bcn->tail = bcn->head + bcn->head_len;
712
713 if (ieee80211_add_ext_srates_ie(sdata, skb, true, band) ||
Johannes Bergbf7cd942013-02-15 14:40:31 +0100714 mesh_add_rsn_ie(sdata, skb) ||
715 mesh_add_ht_cap_ie(sdata, skb) ||
716 mesh_add_ht_oper_ie(sdata, skb) ||
717 mesh_add_meshid_ie(sdata, skb) ||
718 mesh_add_meshconf_ie(sdata, skb) ||
719 mesh_add_awake_window_ie(sdata, skb) ||
720 mesh_add_vendor_ies(sdata, skb))
Thomas Pedersen2b5e1962013-02-14 11:20:13 -0800721 goto out_free;
722
723 bcn->tail_len = skb->len;
724 memcpy(bcn->tail, skb->data, bcn->tail_len);
Thomas Pedersen43552be2013-12-15 13:14:16 -0800725 bcn->meshconf = (struct ieee80211_meshconf_ie *)
726 (bcn->tail + ifmsh->meshconf_offset);
Thomas Pedersen2b5e1962013-02-14 11:20:13 -0800727
728 dev_kfree_skb(skb);
729 rcu_assign_pointer(ifmsh->beacon, bcn);
730 return 0;
731out_free:
732 kfree(bcn);
733 dev_kfree_skb(skb);
734 return -ENOMEM;
735}
736
737static int
Johannes Berg8d61ffa2013-05-10 12:32:47 +0200738ieee80211_mesh_rebuild_beacon(struct ieee80211_sub_if_data *sdata)
Thomas Pedersen2b5e1962013-02-14 11:20:13 -0800739{
Thomas Pedersen2b5e1962013-02-14 11:20:13 -0800740 struct beacon_data *old_bcn;
741 int ret;
Thomas Pedersen2b5e1962013-02-14 11:20:13 -0800742
Johannes Berg8d61ffa2013-05-10 12:32:47 +0200743 old_bcn = rcu_dereference_protected(sdata->u.mesh.beacon,
744 lockdep_is_held(&sdata->wdev.mtx));
745 ret = ieee80211_mesh_build_beacon(&sdata->u.mesh);
Thomas Pedersen2b5e1962013-02-14 11:20:13 -0800746 if (ret)
747 /* just reuse old beacon */
Johannes Berg8d61ffa2013-05-10 12:32:47 +0200748 return ret;
Thomas Pedersen2b5e1962013-02-14 11:20:13 -0800749
750 if (old_bcn)
751 kfree_rcu(old_bcn, rcu_head);
Johannes Berg8d61ffa2013-05-10 12:32:47 +0200752 return 0;
Thomas Pedersen2b5e1962013-02-14 11:20:13 -0800753}
754
755void ieee80211_mbss_info_change_notify(struct ieee80211_sub_if_data *sdata,
756 u32 changed)
757{
Thomas Pedersenf81a9de2013-06-13 15:54:41 -0700758 struct ieee80211_if_mesh *ifmsh = &sdata->u.mesh;
759 unsigned long bits = changed;
760 u32 bit;
761
762 if (!bits)
763 return;
764
765 /* if we race with running work, worst case this work becomes a noop */
766 for_each_set_bit(bit, &bits, sizeof(changed) * BITS_PER_BYTE)
767 set_bit(bit, &ifmsh->mbss_changed);
768 set_bit(MESH_WORK_MBSS_CHANGED, &ifmsh->wrkq_flags);
769 ieee80211_queue_work(&sdata->local->hw, &sdata->work);
Thomas Pedersen2b5e1962013-02-14 11:20:13 -0800770}
771
772int ieee80211_start_mesh(struct ieee80211_sub_if_data *sdata)
Johannes Berg472dbc42008-09-11 00:01:49 +0200773{
774 struct ieee80211_if_mesh *ifmsh = &sdata->u.mesh;
775 struct ieee80211_local *local = sdata->local;
Chun-Yeow Yeohf4eabc92012-12-13 18:59:57 +0800776 u32 changed = BSS_CHANGED_BEACON |
777 BSS_CHANGED_BEACON_ENABLED |
778 BSS_CHANGED_HT |
779 BSS_CHANGED_BASIC_RATES |
780 BSS_CHANGED_BEACON_INT;
Johannes Berg472dbc42008-09-11 00:01:49 +0200781
Johannes Berg09b17472010-12-03 09:20:41 +0100782 local->fif_other_bss++;
783 /* mesh ifaces must set allmulti to forward mcast traffic */
784 atomic_inc(&local->iff_allmultis);
785 ieee80211_configure_filter(local);
786
Javier Cardonac7108a72010-12-16 17:37:50 -0800787 ifmsh->mesh_cc_id = 0; /* Disabled */
Javier Cardonadbf498f2012-03-31 11:31:32 -0700788 /* register sync ops from extensible synchronization framework */
789 ifmsh->sync_ops = ieee80211_mesh_sync_ops_get(ifmsh->mesh_sp_id);
790 ifmsh->adjusting_tbtt = false;
791 ifmsh->sync_offset_clockdrift_max = 0;
Rui Paulo6b9ac442009-10-20 21:21:48 +0100792 set_bit(MESH_WORK_HOUSEKEEPING, &ifmsh->wrkq_flags);
Rui Paulo63c57232009-11-09 23:46:57 +0000793 ieee80211_mesh_root_setup(ifmsh);
Johannes Berg64592c82010-06-10 10:21:31 +0200794 ieee80211_queue_work(&local->hw, &sdata->work);
Ashok Nagarajan70c33ea2012-04-30 14:20:32 -0700795 sdata->vif.bss_conf.ht_operation_mode =
796 ifmsh->mshcfg.ht_opmode;
Johannes Bergd6a83222012-12-14 14:06:28 +0100797 sdata->vif.bss_conf.enable_beacon = true;
Chun-Yeow Yeohf4eabc92012-12-13 18:59:57 +0800798
Thomas Pedersen39886b62013-02-13 12:14:19 -0800799 changed |= ieee80211_mps_local_status_update(sdata);
Marco Porsch3f52b7e2013-01-30 18:14:08 +0100800
Thomas Pedersen2b5e1962013-02-14 11:20:13 -0800801 if (ieee80211_mesh_build_beacon(ifmsh)) {
802 ieee80211_stop_mesh(sdata);
803 return -ENOMEM;
804 }
805
Thomas Pedersen057d5f42013-12-19 10:25:15 -0800806 ieee80211_recalc_dtim(local, sdata);
Chun-Yeow Yeohf4eabc92012-12-13 18:59:57 +0800807 ieee80211_bss_info_change_notify(sdata, changed);
Johannes Bergc405c622012-07-30 19:44:12 +0200808
809 netif_carrier_on(sdata->dev);
Thomas Pedersen2b5e1962013-02-14 11:20:13 -0800810 return 0;
Johannes Berg472dbc42008-09-11 00:01:49 +0200811}
812
813void ieee80211_stop_mesh(struct ieee80211_sub_if_data *sdata)
814{
Johannes Berg09b17472010-12-03 09:20:41 +0100815 struct ieee80211_local *local = sdata->local;
Johannes Berg29cbe682010-12-03 09:20:44 +0100816 struct ieee80211_if_mesh *ifmsh = &sdata->u.mesh;
Thomas Pedersen2b5e1962013-02-14 11:20:13 -0800817 struct beacon_data *bcn;
Johannes Berg29cbe682010-12-03 09:20:44 +0100818
Johannes Bergc405c622012-07-30 19:44:12 +0200819 netif_carrier_off(sdata->dev);
820
Thomas Pedersen0d466b9c2012-08-03 12:21:32 -0700821 /* stop the beacon */
Johannes Berg29cbe682010-12-03 09:20:44 +0100822 ifmsh->mesh_id_len = 0;
Johannes Bergd6a83222012-12-14 14:06:28 +0100823 sdata->vif.bss_conf.enable_beacon = false;
824 clear_bit(SDATA_STATE_OFFCHANNEL_BEACON_STOPPED, &sdata->state);
Johannes Berg29cbe682010-12-03 09:20:44 +0100825 ieee80211_bss_info_change_notify(sdata, BSS_CHANGED_BEACON_ENABLED);
Thomas Pedersen2b5e1962013-02-14 11:20:13 -0800826 bcn = rcu_dereference_protected(ifmsh->beacon,
Johannes Berg8d61ffa2013-05-10 12:32:47 +0200827 lockdep_is_held(&sdata->wdev.mtx));
Monam Agarwal0c2bef462014-03-24 00:51:43 +0530828 RCU_INIT_POINTER(ifmsh->beacon, NULL);
Thomas Pedersen2b5e1962013-02-14 11:20:13 -0800829 kfree_rcu(bcn, rcu_head);
Thomas Pedersen0d466b9c2012-08-03 12:21:32 -0700830
831 /* flush STAs and mpaths on this iface */
Johannes Bergb998e8b2012-12-13 23:07:46 +0100832 sta_info_flush(sdata);
Thomas Pedersen0d466b9c2012-08-03 12:21:32 -0700833 mesh_path_flush_by_iface(sdata);
Johannes Berg09b17472010-12-03 09:20:41 +0100834
Marco Porsch3f52b7e2013-01-30 18:14:08 +0100835 /* free all potentially still buffered group-addressed frames */
836 local->total_ps_buffered -= skb_queue_len(&ifmsh->ps.bc_buf);
837 skb_queue_purge(&ifmsh->ps.bc_buf);
838
Johannes Berg472dbc42008-09-11 00:01:49 +0200839 del_timer_sync(&sdata->u.mesh.housekeeping_timer);
Rui Pauloe304bfd2009-11-09 23:46:56 +0000840 del_timer_sync(&sdata->u.mesh.mesh_path_root_timer);
Johannes Bergdd4c9262012-08-01 21:03:21 +0200841 del_timer_sync(&sdata->u.mesh.mesh_path_timer);
Johannes Berg09b17472010-12-03 09:20:41 +0100842
Thomas Pedersenf81a9de2013-06-13 15:54:41 -0700843 /* clear any mesh work (for next join) we may have accrued */
844 ifmsh->wrkq_flags = 0;
845 ifmsh->mbss_changed = 0;
846
Johannes Berg09b17472010-12-03 09:20:41 +0100847 local->fif_other_bss--;
848 atomic_dec(&local->iff_allmultis);
849 ieee80211_configure_filter(local);
Johannes Berg472dbc42008-09-11 00:01:49 +0200850}
851
Chun-Yeow Yeoh33a45862013-10-17 15:55:18 -0700852static bool
853ieee80211_mesh_process_chnswitch(struct ieee80211_sub_if_data *sdata,
854 struct ieee802_11_elems *elems, bool beacon)
855{
856 struct cfg80211_csa_settings params;
857 struct ieee80211_csa_ie csa_ie;
Chun-Yeow Yeoh33a45862013-10-17 15:55:18 -0700858 struct ieee80211_if_mesh *ifmsh = &sdata->u.mesh;
859 enum ieee80211_band band = ieee80211_get_sdata_band(sdata);
Luciano Coelho0cb4d4d2014-01-13 19:42:58 +0200860 int err;
Chun-Yeow Yeoh33a45862013-10-17 15:55:18 -0700861 u32 sta_flags;
862
Michal Kaziordbd72852014-01-29 07:56:21 +0100863 sdata_assert_lock(sdata);
864
Chun-Yeow Yeoh33a45862013-10-17 15:55:18 -0700865 sta_flags = IEEE80211_STA_DISABLE_VHT;
866 switch (sdata->vif.bss_conf.chandef.width) {
867 case NL80211_CHAN_WIDTH_20_NOHT:
868 sta_flags |= IEEE80211_STA_DISABLE_HT;
869 case NL80211_CHAN_WIDTH_20:
870 sta_flags |= IEEE80211_STA_DISABLE_40MHZ;
871 break;
872 default:
873 break;
874 }
875
876 memset(&params, 0, sizeof(params));
877 memset(&csa_ie, 0, sizeof(csa_ie));
Luciano Coelho84469a42014-10-28 13:33:04 +0200878 err = ieee80211_parse_ch_switch_ie(sdata, elems, band,
Chun-Yeow Yeoh33a45862013-10-17 15:55:18 -0700879 sta_flags, sdata->vif.addr,
880 &csa_ie);
881 if (err < 0)
882 return false;
883 if (err)
884 return false;
885
886 params.chandef = csa_ie.chandef;
887 params.count = csa_ie.count;
888
Chun-Yeow Yeoh33a45862013-10-17 15:55:18 -0700889 if (!cfg80211_chandef_usable(sdata->local->hw.wiphy, &params.chandef,
890 IEEE80211_CHAN_DISABLED)) {
891 sdata_info(sdata,
892 "mesh STA %pM switches to unsupported channel (%d MHz, width:%d, CF1/2: %d/%d MHz), aborting\n",
893 sdata->vif.addr,
894 params.chandef.chan->center_freq,
895 params.chandef.width,
896 params.chandef.center_freq1,
897 params.chandef.center_freq2);
898 return false;
899 }
900
901 err = cfg80211_chandef_dfs_required(sdata->local->hw.wiphy,
Luciano Coelho2beb6dab2014-02-18 11:40:36 +0200902 &params.chandef,
903 NL80211_IFTYPE_MESH_POINT);
Chun-Yeow Yeoh33a45862013-10-17 15:55:18 -0700904 if (err < 0)
905 return false;
Luciano Coelho2beb6dab2014-02-18 11:40:36 +0200906 if (err > 0)
Chun-Yeow Yeoh33a45862013-10-17 15:55:18 -0700907 /* TODO: DFS not (yet) supported */
908 return false;
Luciano Coelho2beb6dab2014-02-18 11:40:36 +0200909
910 params.radar_required = err;
Chun-Yeow Yeoh33a45862013-10-17 15:55:18 -0700911
Luciano Coelho0cb4d4d2014-01-13 19:42:58 +0200912 if (cfg80211_chandef_identical(&params.chandef,
913 &sdata->vif.bss_conf.chandef)) {
914 mcsa_dbg(sdata,
915 "received csa with an identical chandef, ignoring\n");
916 return true;
917 }
Chun-Yeow Yeoh33a45862013-10-17 15:55:18 -0700918
919 mcsa_dbg(sdata,
920 "received channel switch announcement to go to channel %d MHz\n",
921 params.chandef.chan->center_freq);
922
923 params.block_tx = csa_ie.mode & WLAN_EID_CHAN_SWITCH_PARAM_TX_RESTRICT;
Chun-Yeow Yeoh3f718fd2013-11-08 15:09:43 +0800924 if (beacon) {
Chun-Yeow Yeoh33a45862013-10-17 15:55:18 -0700925 ifmsh->chsw_ttl = csa_ie.ttl - 1;
Chun-Yeow Yeoh3f718fd2013-11-08 15:09:43 +0800926 if (ifmsh->pre_value >= csa_ie.pre_value)
927 return false;
928 ifmsh->pre_value = csa_ie.pre_value;
929 }
Chun-Yeow Yeoh33a45862013-10-17 15:55:18 -0700930
Luciano Coelho0cb4d4d2014-01-13 19:42:58 +0200931 if (ifmsh->chsw_ttl >= ifmsh->mshcfg.dot11MeshTTL)
Chun-Yeow Yeoh3f718fd2013-11-08 15:09:43 +0800932 return false;
Chun-Yeow Yeoh33a45862013-10-17 15:55:18 -0700933
Luciano Coelho0cb4d4d2014-01-13 19:42:58 +0200934 ifmsh->csa_role = IEEE80211_MESH_CSA_ROLE_REPEATER;
Chun-Yeow Yeoh33a45862013-10-17 15:55:18 -0700935
Luciano Coelho0cb4d4d2014-01-13 19:42:58 +0200936 if (ieee80211_channel_switch(sdata->local->hw.wiphy, sdata->dev,
937 &params) < 0)
938 return false;
Chun-Yeow Yeoh33a45862013-10-17 15:55:18 -0700939
940 return true;
Chun-Yeow Yeoh33a45862013-10-17 15:55:18 -0700941}
942
Thomas Pedersen9fb04b52013-02-14 11:20:14 -0800943static void
944ieee80211_mesh_rx_probe_req(struct ieee80211_sub_if_data *sdata,
945 struct ieee80211_mgmt *mgmt, size_t len)
946{
947 struct ieee80211_local *local = sdata->local;
948 struct ieee80211_if_mesh *ifmsh = &sdata->u.mesh;
949 struct sk_buff *presp;
950 struct beacon_data *bcn;
951 struct ieee80211_mgmt *hdr;
952 struct ieee802_11_elems elems;
953 size_t baselen;
Johannes Berg511044e2013-03-07 22:47:00 +0100954 u8 *pos;
Thomas Pedersen9fb04b52013-02-14 11:20:14 -0800955
Thomas Pedersen9fb04b52013-02-14 11:20:14 -0800956 pos = mgmt->u.probe_req.variable;
957 baselen = (u8 *) pos - (u8 *) mgmt;
958 if (baselen > len)
959 return;
960
Johannes Bergb2e506b2013-03-26 14:54:16 +0100961 ieee802_11_parse_elems(pos, len - baselen, false, &elems);
Thomas Pedersen9fb04b52013-02-14 11:20:14 -0800962
Chun-Yeow Yeoha4ef66a2013-08-22 10:28:58 -0700963 if (!elems.mesh_id)
964 return;
965
Thomas Pedersen9fb04b52013-02-14 11:20:14 -0800966 /* 802.11-2012 10.1.4.3.2 */
967 if ((!ether_addr_equal(mgmt->da, sdata->vif.addr) &&
968 !is_broadcast_ether_addr(mgmt->da)) ||
969 elems.ssid_len != 0)
970 return;
971
972 if (elems.mesh_id_len != 0 &&
973 (elems.mesh_id_len != ifmsh->mesh_id_len ||
974 memcmp(elems.mesh_id, ifmsh->mesh_id, ifmsh->mesh_id_len)))
975 return;
976
977 rcu_read_lock();
978 bcn = rcu_dereference(ifmsh->beacon);
979
980 if (!bcn)
981 goto out;
982
983 presp = dev_alloc_skb(local->tx_headroom +
984 bcn->head_len + bcn->tail_len);
985 if (!presp)
986 goto out;
987
988 skb_reserve(presp, local->tx_headroom);
989 memcpy(skb_put(presp, bcn->head_len), bcn->head, bcn->head_len);
990 memcpy(skb_put(presp, bcn->tail_len), bcn->tail, bcn->tail_len);
991 hdr = (struct ieee80211_mgmt *) presp->data;
992 hdr->frame_control = cpu_to_le16(IEEE80211_FTYPE_MGMT |
993 IEEE80211_STYPE_PROBE_RESP);
994 memcpy(hdr->da, mgmt->sa, ETH_ALEN);
Thomas Pedersen9fb04b52013-02-14 11:20:14 -0800995 IEEE80211_SKB_CB(presp)->flags |= IEEE80211_TX_INTFL_DONT_ENCRYPT;
996 ieee80211_tx_skb(sdata, presp);
997out:
998 rcu_read_unlock();
999}
1000
Johannes Berg472dbc42008-09-11 00:01:49 +02001001static void ieee80211_mesh_rx_bcn_presp(struct ieee80211_sub_if_data *sdata,
1002 u16 stype,
1003 struct ieee80211_mgmt *mgmt,
1004 size_t len,
1005 struct ieee80211_rx_status *rx_status)
1006{
Johannes Bergc6a1fa12008-10-07 12:04:32 +02001007 struct ieee80211_local *local = sdata->local;
Javier Cardonadbf498f2012-03-31 11:31:32 -07001008 struct ieee80211_if_mesh *ifmsh = &sdata->u.mesh;
Johannes Berg472dbc42008-09-11 00:01:49 +02001009 struct ieee802_11_elems elems;
1010 struct ieee80211_channel *channel;
Johannes Berg472dbc42008-09-11 00:01:49 +02001011 size_t baselen;
1012 int freq;
1013 enum ieee80211_band band = rx_status->band;
1014
1015 /* ignore ProbeResp to foreign address */
1016 if (stype == IEEE80211_STYPE_PROBE_RESP &&
Joe Perchesb203ca32012-05-08 18:56:52 +00001017 !ether_addr_equal(mgmt->da, sdata->vif.addr))
Johannes Berg472dbc42008-09-11 00:01:49 +02001018 return;
1019
1020 baselen = (u8 *) mgmt->u.probe_resp.variable - (u8 *) mgmt;
1021 if (baselen > len)
1022 return;
1023
1024 ieee802_11_parse_elems(mgmt->u.probe_resp.variable, len - baselen,
Johannes Bergb2e506b2013-03-26 14:54:16 +01001025 false, &elems);
Johannes Berg472dbc42008-09-11 00:01:49 +02001026
Thomas Pedersen9a90bc82012-10-20 19:03:10 -07001027 /* ignore non-mesh or secure / unsecure mismatch */
1028 if ((!elems.mesh_id || !elems.mesh_config) ||
1029 (elems.rsn && sdata->u.mesh.security == IEEE80211_MESH_SEC_NONE) ||
1030 (!elems.rsn && sdata->u.mesh.security != IEEE80211_MESH_SEC_NONE))
Javier Cardona5cff5e02011-04-07 15:08:29 -07001031 return;
1032
Johannes Berg1cd8e882013-03-27 14:30:12 +01001033 if (elems.ds_params)
Bruno Randolf59eb21a2011-01-17 13:37:28 +09001034 freq = ieee80211_channel_to_frequency(elems.ds_params[0], band);
Johannes Berg472dbc42008-09-11 00:01:49 +02001035 else
1036 freq = rx_status->freq;
1037
1038 channel = ieee80211_get_channel(local->hw.wiphy, freq);
1039
1040 if (!channel || channel->flags & IEEE80211_CHAN_DISABLED)
1041 return;
1042
Thomas Pedersen9a90bc82012-10-20 19:03:10 -07001043 if (mesh_matches_local(sdata, &elems))
Thomas Pedersenf743ff42012-04-18 19:23:43 -07001044 mesh_neighbour_update(sdata, mgmt->sa, &elems);
Javier Cardonadbf498f2012-03-31 11:31:32 -07001045
1046 if (ifmsh->sync_ops)
1047 ifmsh->sync_ops->rx_bcn_presp(sdata,
1048 stype, mgmt, &elems, rx_status);
Chun-Yeow Yeoh33a45862013-10-17 15:55:18 -07001049
Luciano Coelho0cb4d4d2014-01-13 19:42:58 +02001050 if (ifmsh->csa_role != IEEE80211_MESH_CSA_ROLE_INIT &&
1051 !sdata->vif.csa_active)
Chun-Yeow Yeoh33a45862013-10-17 15:55:18 -07001052 ieee80211_mesh_process_chnswitch(sdata, &elems, true);
Johannes Berg472dbc42008-09-11 00:01:49 +02001053}
1054
Chun-Yeow Yeohb8456a12013-10-17 15:55:02 -07001055int ieee80211_mesh_finish_csa(struct ieee80211_sub_if_data *sdata)
1056{
1057 struct ieee80211_if_mesh *ifmsh = &sdata->u.mesh;
1058 struct mesh_csa_settings *tmp_csa_settings;
1059 int ret = 0;
Michal Kaziorfaf046e2014-01-29 07:56:17 +01001060 int changed = 0;
Chun-Yeow Yeohb8456a12013-10-17 15:55:02 -07001061
1062 /* Reset the TTL value and Initiator flag */
Luciano Coelho0cb4d4d2014-01-13 19:42:58 +02001063 ifmsh->csa_role = IEEE80211_MESH_CSA_ROLE_NONE;
Chun-Yeow Yeohb8456a12013-10-17 15:55:02 -07001064 ifmsh->chsw_ttl = 0;
1065
1066 /* Remove the CSA and MCSP elements from the beacon */
1067 tmp_csa_settings = rcu_dereference(ifmsh->csa);
Monam Agarwal0c2bef462014-03-24 00:51:43 +05301068 RCU_INIT_POINTER(ifmsh->csa, NULL);
Luciano Coelho66e01cf2014-01-13 19:43:00 +02001069 if (tmp_csa_settings)
1070 kfree_rcu(tmp_csa_settings, rcu_head);
Chun-Yeow Yeohb8456a12013-10-17 15:55:02 -07001071 ret = ieee80211_mesh_rebuild_beacon(sdata);
1072 if (ret)
1073 return -EINVAL;
1074
Michal Kaziorfaf046e2014-01-29 07:56:17 +01001075 changed |= BSS_CHANGED_BEACON;
Chun-Yeow Yeohb8456a12013-10-17 15:55:02 -07001076
1077 mcsa_dbg(sdata, "complete switching to center freq %d MHz",
1078 sdata->vif.bss_conf.chandef.chan->center_freq);
Michal Kaziorfaf046e2014-01-29 07:56:17 +01001079 return changed;
Chun-Yeow Yeohb8456a12013-10-17 15:55:02 -07001080}
1081
1082int ieee80211_mesh_csa_beacon(struct ieee80211_sub_if_data *sdata,
Luciano Coelho66e01cf2014-01-13 19:43:00 +02001083 struct cfg80211_csa_settings *csa_settings)
Chun-Yeow Yeohb8456a12013-10-17 15:55:02 -07001084{
1085 struct ieee80211_if_mesh *ifmsh = &sdata->u.mesh;
1086 struct mesh_csa_settings *tmp_csa_settings;
1087 int ret = 0;
1088
1089 tmp_csa_settings = kmalloc(sizeof(*tmp_csa_settings),
1090 GFP_ATOMIC);
1091 if (!tmp_csa_settings)
1092 return -ENOMEM;
1093
1094 memcpy(&tmp_csa_settings->settings, csa_settings,
1095 sizeof(struct cfg80211_csa_settings));
1096
1097 rcu_assign_pointer(ifmsh->csa, tmp_csa_settings);
1098
1099 ret = ieee80211_mesh_rebuild_beacon(sdata);
1100 if (ret) {
1101 tmp_csa_settings = rcu_dereference(ifmsh->csa);
Monam Agarwal0c2bef462014-03-24 00:51:43 +05301102 RCU_INIT_POINTER(ifmsh->csa, NULL);
Chun-Yeow Yeohb8456a12013-10-17 15:55:02 -07001103 kfree_rcu(tmp_csa_settings, rcu_head);
1104 return ret;
1105 }
1106
Luciano Coelhob58e81e2014-01-13 19:42:59 +02001107 return BSS_CHANGED_BEACON;
Chun-Yeow Yeohb8456a12013-10-17 15:55:02 -07001108}
1109
Chun-Yeow Yeoh8f2535b2013-10-14 19:08:27 -07001110static int mesh_fwd_csa_frame(struct ieee80211_sub_if_data *sdata,
1111 struct ieee80211_mgmt *mgmt, size_t len)
1112{
1113 struct ieee80211_mgmt *mgmt_fwd;
1114 struct sk_buff *skb;
1115 struct ieee80211_local *local = sdata->local;
1116 u8 *pos = mgmt->u.action.u.chan_switch.variable;
1117 size_t offset_ttl;
1118
1119 skb = dev_alloc_skb(local->tx_headroom + len);
1120 if (!skb)
1121 return -ENOMEM;
1122 skb_reserve(skb, local->tx_headroom);
1123 mgmt_fwd = (struct ieee80211_mgmt *) skb_put(skb, len);
1124
1125 /* offset_ttl is based on whether the secondary channel
Antonio Ospiteb314c662014-06-04 14:03:49 +02001126 * offset is available or not. Subtract 1 from the mesh TTL
Chun-Yeow Yeoh8f2535b2013-10-14 19:08:27 -07001127 * and disable the initiator flag before forwarding.
1128 */
1129 offset_ttl = (len < 42) ? 7 : 10;
1130 *(pos + offset_ttl) -= 1;
1131 *(pos + offset_ttl + 1) &= ~WLAN_EID_CHAN_SWITCH_PARAM_INITIATOR;
1132
1133 memcpy(mgmt_fwd, mgmt, len);
1134 eth_broadcast_addr(mgmt_fwd->da);
1135 memcpy(mgmt_fwd->sa, sdata->vif.addr, ETH_ALEN);
1136 memcpy(mgmt_fwd->bssid, sdata->vif.addr, ETH_ALEN);
1137
1138 ieee80211_tx_skb(sdata, skb);
1139 return 0;
1140}
1141
1142static void mesh_rx_csa_frame(struct ieee80211_sub_if_data *sdata,
1143 struct ieee80211_mgmt *mgmt, size_t len)
1144{
1145 struct ieee80211_if_mesh *ifmsh = &sdata->u.mesh;
1146 struct ieee802_11_elems elems;
1147 u16 pre_value;
Chun-Yeow Yeoh33a45862013-10-17 15:55:18 -07001148 bool fwd_csa = true;
Chun-Yeow Yeoh8f2535b2013-10-14 19:08:27 -07001149 size_t baselen;
Chun-Yeow Yeoh3f718fd2013-11-08 15:09:43 +08001150 u8 *pos;
Chun-Yeow Yeoh8f2535b2013-10-14 19:08:27 -07001151
1152 if (mgmt->u.action.u.measurement.action_code !=
1153 WLAN_ACTION_SPCT_CHL_SWITCH)
1154 return;
1155
1156 pos = mgmt->u.action.u.chan_switch.variable;
1157 baselen = offsetof(struct ieee80211_mgmt,
1158 u.action.u.chan_switch.variable);
1159 ieee802_11_parse_elems(pos, len - baselen, false, &elems);
1160
Chun-Yeow Yeoh3f718fd2013-11-08 15:09:43 +08001161 ifmsh->chsw_ttl = elems.mesh_chansw_params_ie->mesh_ttl;
1162 if (!--ifmsh->chsw_ttl)
Chun-Yeow Yeoh8f2535b2013-10-14 19:08:27 -07001163 fwd_csa = false;
1164
1165 pre_value = le16_to_cpu(elems.mesh_chansw_params_ie->mesh_pre_value);
1166 if (ifmsh->pre_value >= pre_value)
1167 return;
1168
1169 ifmsh->pre_value = pre_value;
1170
Luciano Coelho0cb4d4d2014-01-13 19:42:58 +02001171 if (!sdata->vif.csa_active &&
1172 !ieee80211_mesh_process_chnswitch(sdata, &elems, false)) {
Chun-Yeow Yeoh33a45862013-10-17 15:55:18 -07001173 mcsa_dbg(sdata, "Failed to process CSA action frame");
1174 return;
1175 }
1176
Chun-Yeow Yeoh8f2535b2013-10-14 19:08:27 -07001177 /* forward or re-broadcast the CSA frame */
1178 if (fwd_csa) {
1179 if (mesh_fwd_csa_frame(sdata, mgmt, len) < 0)
1180 mcsa_dbg(sdata, "Failed to forward the CSA frame");
1181 }
Chun-Yeow Yeoh8f2535b2013-10-14 19:08:27 -07001182}
1183
Johannes Berg472dbc42008-09-11 00:01:49 +02001184static void ieee80211_mesh_rx_mgmt_action(struct ieee80211_sub_if_data *sdata,
1185 struct ieee80211_mgmt *mgmt,
1186 size_t len,
1187 struct ieee80211_rx_status *rx_status)
1188{
1189 switch (mgmt->u.action.category) {
Thomas Pedersen8db09852011-08-12 20:01:00 -07001190 case WLAN_CATEGORY_SELF_PROTECTED:
1191 switch (mgmt->u.action.u.self_prot.action_code) {
1192 case WLAN_SP_MESH_PEERING_OPEN:
1193 case WLAN_SP_MESH_PEERING_CLOSE:
1194 case WLAN_SP_MESH_PEERING_CONFIRM:
1195 mesh_rx_plink_frame(sdata, mgmt, len, rx_status);
1196 break;
1197 }
Johannes Berg472dbc42008-09-11 00:01:49 +02001198 break;
Thomas Pedersen25d49e42011-08-11 19:35:15 -07001199 case WLAN_CATEGORY_MESH_ACTION:
1200 if (mesh_action_is_path_sel(mgmt))
1201 mesh_rx_path_sel_frame(sdata, mgmt, len);
Johannes Berg472dbc42008-09-11 00:01:49 +02001202 break;
Chun-Yeow Yeoh8f2535b2013-10-14 19:08:27 -07001203 case WLAN_CATEGORY_SPECTRUM_MGMT:
1204 mesh_rx_csa_frame(sdata, mgmt, len);
1205 break;
Johannes Berg472dbc42008-09-11 00:01:49 +02001206 }
1207}
1208
Johannes Berg1fa57d02010-06-10 10:21:32 +02001209void ieee80211_mesh_rx_queued_mgmt(struct ieee80211_sub_if_data *sdata,
1210 struct sk_buff *skb)
Johannes Berg472dbc42008-09-11 00:01:49 +02001211{
1212 struct ieee80211_rx_status *rx_status;
Johannes Berg472dbc42008-09-11 00:01:49 +02001213 struct ieee80211_mgmt *mgmt;
1214 u16 stype;
1215
Thomas Pedersenecccd072013-06-10 13:17:21 -07001216 sdata_lock(sdata);
1217
1218 /* mesh already went down */
Johannes Berg1693d342014-01-22 10:08:57 +01001219 if (!sdata->u.mesh.mesh_id_len)
Thomas Pedersenecccd072013-06-10 13:17:21 -07001220 goto out;
1221
Johannes Bergf1d58c22009-06-17 13:13:00 +02001222 rx_status = IEEE80211_SKB_RXCB(skb);
Johannes Berg472dbc42008-09-11 00:01:49 +02001223 mgmt = (struct ieee80211_mgmt *) skb->data;
1224 stype = le16_to_cpu(mgmt->frame_control) & IEEE80211_FCTL_STYPE;
1225
1226 switch (stype) {
1227 case IEEE80211_STYPE_PROBE_RESP:
1228 case IEEE80211_STYPE_BEACON:
1229 ieee80211_mesh_rx_bcn_presp(sdata, stype, mgmt, skb->len,
1230 rx_status);
1231 break;
Thomas Pedersen9fb04b52013-02-14 11:20:14 -08001232 case IEEE80211_STYPE_PROBE_REQ:
1233 ieee80211_mesh_rx_probe_req(sdata, mgmt, skb->len);
1234 break;
Johannes Berg472dbc42008-09-11 00:01:49 +02001235 case IEEE80211_STYPE_ACTION:
1236 ieee80211_mesh_rx_mgmt_action(sdata, mgmt, skb->len, rx_status);
1237 break;
1238 }
Thomas Pedersenecccd072013-06-10 13:17:21 -07001239out:
1240 sdata_unlock(sdata);
Johannes Berg472dbc42008-09-11 00:01:49 +02001241}
1242
Thomas Pedersenf81a9de2013-06-13 15:54:41 -07001243static void mesh_bss_info_changed(struct ieee80211_sub_if_data *sdata)
1244{
1245 struct ieee80211_if_mesh *ifmsh = &sdata->u.mesh;
1246 u32 bit, changed = 0;
1247
1248 for_each_set_bit(bit, &ifmsh->mbss_changed,
1249 sizeof(changed) * BITS_PER_BYTE) {
1250 clear_bit(bit, &ifmsh->mbss_changed);
1251 changed |= BIT(bit);
1252 }
1253
1254 if (sdata->vif.bss_conf.enable_beacon &&
1255 (changed & (BSS_CHANGED_BEACON |
1256 BSS_CHANGED_HT |
1257 BSS_CHANGED_BASIC_RATES |
1258 BSS_CHANGED_BEACON_INT)))
1259 if (ieee80211_mesh_rebuild_beacon(sdata))
1260 return;
1261
1262 ieee80211_bss_info_change_notify(sdata, changed);
1263}
1264
Johannes Berg1fa57d02010-06-10 10:21:32 +02001265void ieee80211_mesh_work(struct ieee80211_sub_if_data *sdata)
Johannes Berg472dbc42008-09-11 00:01:49 +02001266{
Johannes Berg472dbc42008-09-11 00:01:49 +02001267 struct ieee80211_if_mesh *ifmsh = &sdata->u.mesh;
Johannes Berg472dbc42008-09-11 00:01:49 +02001268
Thomas Pedersenecccd072013-06-10 13:17:21 -07001269 sdata_lock(sdata);
1270
1271 /* mesh already went down */
Johannes Berg1693d342014-01-22 10:08:57 +01001272 if (!sdata->u.mesh.mesh_id_len)
Thomas Pedersenecccd072013-06-10 13:17:21 -07001273 goto out;
1274
Johannes Berg472dbc42008-09-11 00:01:49 +02001275 if (ifmsh->preq_queue_len &&
1276 time_after(jiffies,
1277 ifmsh->last_preq + msecs_to_jiffies(ifmsh->mshcfg.dot11MeshHWMPpreqMinInterval)))
1278 mesh_path_start_discovery(sdata);
1279
Javier Cardona18889232009-08-10 12:15:52 -07001280 if (test_and_clear_bit(MESH_WORK_GROW_MPATH_TABLE, &ifmsh->wrkq_flags))
1281 mesh_mpath_table_grow();
1282
Nick Ledovskikhdcac9082011-01-11 14:35:12 +00001283 if (test_and_clear_bit(MESH_WORK_GROW_MPP_TABLE, &ifmsh->wrkq_flags))
Javier Cardona18889232009-08-10 12:15:52 -07001284 mesh_mpp_table_grow();
1285
1286 if (test_and_clear_bit(MESH_WORK_HOUSEKEEPING, &ifmsh->wrkq_flags))
Johannes Bergbf7cd942013-02-15 14:40:31 +01001287 ieee80211_mesh_housekeeping(sdata);
Rui Pauloe304bfd2009-11-09 23:46:56 +00001288
1289 if (test_and_clear_bit(MESH_WORK_ROOT, &ifmsh->wrkq_flags))
1290 ieee80211_mesh_rootpath(sdata);
Javier Cardonadbf498f2012-03-31 11:31:32 -07001291
1292 if (test_and_clear_bit(MESH_WORK_DRIFT_ADJUST, &ifmsh->wrkq_flags))
1293 mesh_sync_adjust_tbtt(sdata);
Thomas Pedersenecccd072013-06-10 13:17:21 -07001294
Thomas Pedersenf81a9de2013-06-13 15:54:41 -07001295 if (test_and_clear_bit(MESH_WORK_MBSS_CHANGED, &ifmsh->wrkq_flags))
1296 mesh_bss_info_changed(sdata);
Thomas Pedersenecccd072013-06-10 13:17:21 -07001297out:
1298 sdata_unlock(sdata);
Johannes Berg472dbc42008-09-11 00:01:49 +02001299}
1300
1301void ieee80211_mesh_notify_scan_completed(struct ieee80211_local *local)
1302{
1303 struct ieee80211_sub_if_data *sdata;
1304
1305 rcu_read_lock();
1306 list_for_each_entry_rcu(sdata, &local->interfaces, list)
Ben Greear370bd002013-03-19 17:50:50 -07001307 if (ieee80211_vif_is_mesh(&sdata->vif) &&
1308 ieee80211_sdata_running(sdata))
Johannes Berg64592c82010-06-10 10:21:31 +02001309 ieee80211_queue_work(&local->hw, &sdata->work);
Johannes Berg472dbc42008-09-11 00:01:49 +02001310 rcu_read_unlock();
1311}
1312
Johannes Berg902acc72008-02-23 15:17:19 +01001313void ieee80211_mesh_init_sdata(struct ieee80211_sub_if_data *sdata)
1314{
Johannes Berg472dbc42008-09-11 00:01:49 +02001315 struct ieee80211_if_mesh *ifmsh = &sdata->u.mesh;
Johannes Bergad2d2232012-12-14 14:34:25 +01001316 static u8 zero_addr[ETH_ALEN] = {};
Johannes Berg902acc72008-02-23 15:17:19 +01001317
Johannes Berg472dbc42008-09-11 00:01:49 +02001318 setup_timer(&ifmsh->housekeeping_timer,
1319 ieee80211_mesh_housekeeping_timer,
1320 (unsigned long) sdata);
Johannes Berg472dbc42008-09-11 00:01:49 +02001321
Johannes Berg472dbc42008-09-11 00:01:49 +02001322 ifmsh->accepting_plinks = true;
Johannes Berg472dbc42008-09-11 00:01:49 +02001323 atomic_set(&ifmsh->mpaths, 0);
Jasper Bryant-Greenef698d852008-08-03 12:04:37 +12001324 mesh_rmc_init(sdata);
Johannes Berg472dbc42008-09-11 00:01:49 +02001325 ifmsh->last_preq = jiffies;
Thomas Pedersendca7e942011-11-24 17:15:24 -08001326 ifmsh->next_perr = jiffies;
Luciano Coelho0cb4d4d2014-01-13 19:42:58 +02001327 ifmsh->csa_role = IEEE80211_MESH_CSA_ROLE_NONE;
Johannes Berg902acc72008-02-23 15:17:19 +01001328 /* Allocate all mesh structures when creating the first mesh interface. */
1329 if (!mesh_allocated)
1330 ieee80211s_init();
Johannes Berg472dbc42008-09-11 00:01:49 +02001331 setup_timer(&ifmsh->mesh_path_timer,
Johannes Berg902acc72008-02-23 15:17:19 +01001332 ieee80211_mesh_path_timer,
1333 (unsigned long) sdata);
Rui Pauloe304bfd2009-11-09 23:46:56 +00001334 setup_timer(&ifmsh->mesh_path_root_timer,
1335 ieee80211_mesh_path_root_timer,
1336 (unsigned long) sdata);
Johannes Berg472dbc42008-09-11 00:01:49 +02001337 INIT_LIST_HEAD(&ifmsh->preq_queue.list);
Marco Porsch3f52b7e2013-01-30 18:14:08 +01001338 skb_queue_head_init(&ifmsh->ps.bc_buf);
Johannes Berg472dbc42008-09-11 00:01:49 +02001339 spin_lock_init(&ifmsh->mesh_preq_queue_lock);
Javier Cardonadbf498f2012-03-31 11:31:32 -07001340 spin_lock_init(&ifmsh->sync_offset_lock);
Thomas Pedersen2b5e1962013-02-14 11:20:13 -08001341 RCU_INIT_POINTER(ifmsh->beacon, NULL);
Johannes Bergad2d2232012-12-14 14:34:25 +01001342
1343 sdata->vif.bss_conf.bssid = zero_addr;
Johannes Berg472dbc42008-09-11 00:01:49 +02001344}