blob: 38137cb5f6f05877a6aadca7fcb846d0062df648 [file] [log] [blame]
Jiri Bencf0706e822007-05-05 11:45:53 -07001/*
2 * Copyright 2002-2005, Instant802 Networks, Inc.
3 * Copyright 2006-2007 Jiri Benc <jbenc@suse.cz>
4 *
5 * This program is free software; you can redistribute it and/or modify
6 * it under the terms of the GNU General Public License version 2 as
7 * published by the Free Software Foundation.
8 */
9
10#include <linux/module.h>
11#include <linux/init.h>
Felix Fietkau888d04d2012-03-01 15:22:09 +010012#include <linux/etherdevice.h>
Jiri Bencf0706e822007-05-05 11:45:53 -070013#include <linux/netdevice.h>
14#include <linux/types.h>
15#include <linux/slab.h>
16#include <linux/skbuff.h>
17#include <linux/if_arp.h>
Johannes Berg0d174402007-12-17 15:07:43 +010018#include <linux/timer.h>
Johannes Bergd0709a62008-02-25 16:27:46 +010019#include <linux/rtnetlink.h>
Jiri Bencf0706e822007-05-05 11:45:53 -070020
21#include <net/mac80211.h>
22#include "ieee80211_i.h"
Johannes Berg24487982009-04-23 18:52:52 +020023#include "driver-ops.h"
Johannes Berg2c8dccc2008-04-08 15:14:40 -040024#include "rate.h"
Jiri Bencf0706e822007-05-05 11:45:53 -070025#include "sta_info.h"
Jiri Bence9f207f2007-05-05 11:46:38 -070026#include "debugfs_sta.h"
Luis Carlos Coboee385852008-02-23 15:17:11 +010027#include "mesh.h"
Johannes Bergce662b442011-09-29 16:04:34 +020028#include "wme.h"
Jiri Bencf0706e822007-05-05 11:45:53 -070029
Johannes Bergd0709a62008-02-25 16:27:46 +010030/**
31 * DOC: STA information lifetime rules
32 *
33 * STA info structures (&struct sta_info) are managed in a hash table
34 * for faster lookup and a list for iteration. They are managed using
35 * RCU, i.e. access to the list and hash table is protected by RCU.
36 *
Johannes Berg34e89502010-02-03 13:59:58 +010037 * Upon allocating a STA info structure with sta_info_alloc(), the caller
38 * owns that structure. It must then insert it into the hash table using
39 * either sta_info_insert() or sta_info_insert_rcu(); only in the latter
40 * case (which acquires an rcu read section but must not be called from
41 * within one) will the pointer still be valid after the call. Note that
42 * the caller may not do much with the STA info before inserting it, in
43 * particular, it may not start any mesh peer link management or add
44 * encryption keys.
Johannes Berg93e5deb2008-04-01 15:21:00 +020045 *
46 * When the insertion fails (sta_info_insert()) returns non-zero), the
47 * structure will have been freed by sta_info_insert()!
Johannes Bergd0709a62008-02-25 16:27:46 +010048 *
Johannes Berg34e89502010-02-03 13:59:58 +010049 * Station entries are added by mac80211 when you establish a link with a
Luis R. Rodriguez7e189a12009-06-02 18:38:14 -040050 * peer. This means different things for the different type of interfaces
51 * we support. For a regular station this mean we add the AP sta when we
Lucas De Marchi25985ed2011-03-30 22:57:33 -030052 * receive an association response from the AP. For IBSS this occurs when
Johannes Berg34e89502010-02-03 13:59:58 +010053 * get to know about a peer on the same IBSS. For WDS we add the sta for
Lucas De Marchi25985ed2011-03-30 22:57:33 -030054 * the peer immediately upon device open. When using AP mode we add stations
Johannes Berg34e89502010-02-03 13:59:58 +010055 * for each respective station upon request from userspace through nl80211.
Luis R. Rodriguez7e189a12009-06-02 18:38:14 -040056 *
Johannes Berg34e89502010-02-03 13:59:58 +010057 * In order to remove a STA info structure, various sta_info_destroy_*()
58 * calls are available.
Johannes Bergd0709a62008-02-25 16:27:46 +010059 *
Johannes Berg34e89502010-02-03 13:59:58 +010060 * There is no concept of ownership on a STA entry, each structure is
61 * owned by the global hash table/list until it is removed. All users of
62 * the structure need to be RCU protected so that the structure won't be
63 * freed before they are done using it.
Johannes Bergd0709a62008-02-25 16:27:46 +010064 */
Jiri Bencf0706e822007-05-05 11:45:53 -070065
Johannes Berg4d339602011-12-15 11:24:20 +010066/* Caller must hold local->sta_mtx */
Michael Wube8755e2007-07-27 15:43:23 +020067static int sta_info_hash_del(struct ieee80211_local *local,
68 struct sta_info *sta)
Jiri Bencf0706e822007-05-05 11:45:53 -070069{
70 struct sta_info *s;
71
Johannes Berg40b275b2011-05-13 14:15:49 +020072 s = rcu_dereference_protected(local->sta_hash[STA_HASH(sta->sta.addr)],
Johannes Berg4d339602011-12-15 11:24:20 +010073 lockdep_is_held(&local->sta_mtx));
Jiri Bencf0706e822007-05-05 11:45:53 -070074 if (!s)
Michael Wube8755e2007-07-27 15:43:23 +020075 return -ENOENT;
76 if (s == sta) {
Eric Dumazetcf778b02012-01-12 04:41:32 +000077 rcu_assign_pointer(local->sta_hash[STA_HASH(sta->sta.addr)],
Johannes Bergd0709a62008-02-25 16:27:46 +010078 s->hnext);
Michael Wube8755e2007-07-27 15:43:23 +020079 return 0;
Jiri Bencf0706e822007-05-05 11:45:53 -070080 }
81
Johannes Berg40b275b2011-05-13 14:15:49 +020082 while (rcu_access_pointer(s->hnext) &&
83 rcu_access_pointer(s->hnext) != sta)
84 s = rcu_dereference_protected(s->hnext,
Johannes Berg4d339602011-12-15 11:24:20 +010085 lockdep_is_held(&local->sta_mtx));
Johannes Berg40b275b2011-05-13 14:15:49 +020086 if (rcu_access_pointer(s->hnext)) {
Eric Dumazetcf778b02012-01-12 04:41:32 +000087 rcu_assign_pointer(s->hnext, sta->hnext);
Michael Wube8755e2007-07-27 15:43:23 +020088 return 0;
89 }
Jiri Bencf0706e822007-05-05 11:45:53 -070090
Michael Wube8755e2007-07-27 15:43:23 +020091 return -ENOENT;
Jiri Bencf0706e822007-05-05 11:45:53 -070092}
93
Johannes Bergd0709a62008-02-25 16:27:46 +010094/* protected by RCU */
Johannes Bergabe60632009-11-25 17:46:18 +010095struct sta_info *sta_info_get(struct ieee80211_sub_if_data *sdata,
96 const u8 *addr)
Johannes Berg43ba7e92008-02-21 14:09:30 +010097{
Johannes Bergabe60632009-11-25 17:46:18 +010098 struct ieee80211_local *local = sdata->local;
Johannes Berg43ba7e92008-02-21 14:09:30 +010099 struct sta_info *sta;
100
Johannes Berg03791852010-04-06 11:18:42 +0200101 sta = rcu_dereference_check(local->sta_hash[STA_HASH(addr)],
Johannes Berg03791852010-04-06 11:18:42 +0200102 lockdep_is_held(&local->sta_mtx));
Johannes Berg43ba7e92008-02-21 14:09:30 +0100103 while (sta) {
Johannes Bergabe60632009-11-25 17:46:18 +0100104 if (sta->sdata == sdata &&
Felix Fietkau888d04d2012-03-01 15:22:09 +0100105 compare_ether_addr(sta->sta.addr, addr) == 0)
Johannes Berg43ba7e92008-02-21 14:09:30 +0100106 break;
Johannes Berg03791852010-04-06 11:18:42 +0200107 sta = rcu_dereference_check(sta->hnext,
Johannes Berg03791852010-04-06 11:18:42 +0200108 lockdep_is_held(&local->sta_mtx));
Johannes Berg43ba7e92008-02-21 14:09:30 +0100109 }
110 return sta;
111}
112
Felix Fietkau0e5ded52010-01-08 18:10:58 +0100113/*
114 * Get sta info either from the specified interface
115 * or from one of its vlans
116 */
117struct sta_info *sta_info_get_bss(struct ieee80211_sub_if_data *sdata,
118 const u8 *addr)
119{
120 struct ieee80211_local *local = sdata->local;
121 struct sta_info *sta;
122
Johannes Berg03791852010-04-06 11:18:42 +0200123 sta = rcu_dereference_check(local->sta_hash[STA_HASH(addr)],
Johannes Berg03791852010-04-06 11:18:42 +0200124 lockdep_is_held(&local->sta_mtx));
Felix Fietkau0e5ded52010-01-08 18:10:58 +0100125 while (sta) {
126 if ((sta->sdata == sdata ||
Johannes Berga2c1e3d2010-09-14 21:34:14 +0200127 (sta->sdata->bss && sta->sdata->bss == sdata->bss)) &&
Felix Fietkau888d04d2012-03-01 15:22:09 +0100128 compare_ether_addr(sta->sta.addr, addr) == 0)
Felix Fietkau0e5ded52010-01-08 18:10:58 +0100129 break;
Johannes Berg03791852010-04-06 11:18:42 +0200130 sta = rcu_dereference_check(sta->hnext,
Johannes Berg03791852010-04-06 11:18:42 +0200131 lockdep_is_held(&local->sta_mtx));
Felix Fietkau0e5ded52010-01-08 18:10:58 +0100132 }
133 return sta;
134}
135
Johannes Berg3b53fde82009-11-16 12:00:37 +0100136struct sta_info *sta_info_get_by_idx(struct ieee80211_sub_if_data *sdata,
137 int idx)
Luis Carlos Coboee385852008-02-23 15:17:11 +0100138{
Johannes Berg3b53fde82009-11-16 12:00:37 +0100139 struct ieee80211_local *local = sdata->local;
Luis Carlos Coboee385852008-02-23 15:17:11 +0100140 struct sta_info *sta;
141 int i = 0;
142
Johannes Bergd0709a62008-02-25 16:27:46 +0100143 list_for_each_entry_rcu(sta, &local->sta_list, list) {
Johannes Berg3b53fde82009-11-16 12:00:37 +0100144 if (sdata != sta->sdata)
Luis Carlos Cobo2a8ca292008-02-29 17:51:25 -0800145 continue;
Luis Carlos Coboee385852008-02-23 15:17:11 +0100146 if (i < idx) {
147 ++i;
148 continue;
Luis Carlos Coboee385852008-02-23 15:17:11 +0100149 }
Luis Carlos Cobo2a8ca292008-02-29 17:51:25 -0800150 return sta;
Luis Carlos Coboee385852008-02-23 15:17:11 +0100151 }
Luis Carlos Coboee385852008-02-23 15:17:11 +0100152
153 return NULL;
154}
Jiri Bencf0706e822007-05-05 11:45:53 -0700155
Johannes Berg93e5deb2008-04-01 15:21:00 +0200156/**
Johannes Bergd9a7ddb2011-12-14 12:35:30 +0100157 * sta_info_free - free STA
Johannes Berg93e5deb2008-04-01 15:21:00 +0200158 *
Randy Dunlap6ef307b2008-07-03 13:52:18 -0700159 * @local: pointer to the global information
Johannes Berg93e5deb2008-04-01 15:21:00 +0200160 * @sta: STA info to free
161 *
162 * This function must undo everything done by sta_info_alloc()
Johannes Bergd9a7ddb2011-12-14 12:35:30 +0100163 * that may happen before sta_info_insert(). It may only be
164 * called when sta_info_insert() has not been attempted (and
165 * if that fails, the station is freed anyway.)
Johannes Berg93e5deb2008-04-01 15:21:00 +0200166 */
Johannes Bergd9a7ddb2011-12-14 12:35:30 +0100167void sta_info_free(struct ieee80211_local *local, struct sta_info *sta)
Johannes Berg93e5deb2008-04-01 15:21:00 +0200168{
Johannes Berg889cbb92012-01-17 10:33:29 +0100169 if (sta->rate_ctrl)
Johannes Bergaf65cd92009-11-17 18:18:36 +0100170 rate_control_free_sta(sta);
Johannes Berg93e5deb2008-04-01 15:21:00 +0200171
172#ifdef CONFIG_MAC80211_VERBOSE_DEBUG
Joe Perches0fb9a9e2010-08-20 16:25:38 -0700173 wiphy_debug(local->hw.wiphy, "Destroyed STA %pM\n", sta->sta.addr);
Johannes Berg93e5deb2008-04-01 15:21:00 +0200174#endif /* CONFIG_MAC80211_VERBOSE_DEBUG */
175
176 kfree(sta);
177}
178
Johannes Berg4d339602011-12-15 11:24:20 +0100179/* Caller must hold local->sta_mtx */
Johannes Bergd0709a62008-02-25 16:27:46 +0100180static void sta_info_hash_add(struct ieee80211_local *local,
181 struct sta_info *sta)
Jiri Bencf0706e822007-05-05 11:45:53 -0700182{
Johannes Berg4d339602011-12-15 11:24:20 +0100183 lockdep_assert_held(&local->sta_mtx);
Johannes Berg17741cd2008-09-11 00:02:02 +0200184 sta->hnext = local->sta_hash[STA_HASH(sta->sta.addr)];
Eric Dumazetcf778b02012-01-12 04:41:32 +0000185 rcu_assign_pointer(local->sta_hash[STA_HASH(sta->sta.addr)], sta);
Jiri Bencf0706e822007-05-05 11:45:53 -0700186}
Jiri Bencf0706e822007-05-05 11:45:53 -0700187
Johannes Bergaf818582009-11-06 11:35:50 +0100188static void sta_unblock(struct work_struct *wk)
189{
190 struct sta_info *sta;
191
192 sta = container_of(wk, struct sta_info, drv_unblock_wk);
193
194 if (sta->dead)
195 return;
196
Helmut Schaa54420472012-01-17 09:22:49 +0100197 if (!test_sta_flag(sta, WLAN_STA_PS_STA)) {
198 local_bh_disable();
Johannes Bergaf818582009-11-06 11:35:50 +0100199 ieee80211_sta_ps_deliver_wakeup(sta);
Helmut Schaa54420472012-01-17 09:22:49 +0100200 local_bh_enable();
201 } else if (test_and_clear_sta_flag(sta, WLAN_STA_PSPOLL)) {
Johannes Bergc2c98fd2011-09-29 16:04:36 +0200202 clear_sta_flag(sta, WLAN_STA_PS_DRIVER);
Johannes Bergce662b442011-09-29 16:04:34 +0200203
204 local_bh_disable();
Johannes Bergaf818582009-11-06 11:35:50 +0100205 ieee80211_sta_ps_deliver_poll_response(sta);
Johannes Bergce662b442011-09-29 16:04:34 +0200206 local_bh_enable();
Johannes Bergc2c98fd2011-09-29 16:04:36 +0200207 } else if (test_and_clear_sta_flag(sta, WLAN_STA_UAPSD)) {
208 clear_sta_flag(sta, WLAN_STA_PS_DRIVER);
Johannes Bergce662b442011-09-29 16:04:34 +0200209
210 local_bh_disable();
Johannes Berg47086fc2011-09-29 16:04:33 +0200211 ieee80211_sta_ps_deliver_uapsd(sta);
Johannes Bergce662b442011-09-29 16:04:34 +0200212 local_bh_enable();
Johannes Berg50a94322010-11-16 11:50:28 -0800213 } else
Johannes Bergc2c98fd2011-09-29 16:04:36 +0200214 clear_sta_flag(sta, WLAN_STA_PS_DRIVER);
Johannes Bergaf818582009-11-06 11:35:50 +0100215}
216
Johannes Bergaf65cd92009-11-17 18:18:36 +0100217static int sta_prepare_rate_control(struct ieee80211_local *local,
218 struct sta_info *sta, gfp_t gfp)
219{
220 if (local->hw.flags & IEEE80211_HW_HAS_RATE_CONTROL)
221 return 0;
222
Johannes Berg889cbb92012-01-17 10:33:29 +0100223 sta->rate_ctrl = local->rate_ctrl;
Johannes Bergaf65cd92009-11-17 18:18:36 +0100224 sta->rate_ctrl_priv = rate_control_alloc_sta(sta->rate_ctrl,
225 &sta->sta, gfp);
Johannes Berg889cbb92012-01-17 10:33:29 +0100226 if (!sta->rate_ctrl_priv)
Johannes Bergaf65cd92009-11-17 18:18:36 +0100227 return -ENOMEM;
Johannes Bergaf65cd92009-11-17 18:18:36 +0100228
229 return 0;
230}
231
Johannes Berg73651ee2008-02-25 16:27:47 +0100232struct sta_info *sta_info_alloc(struct ieee80211_sub_if_data *sdata,
Johannes Berg56544162011-12-14 13:28:46 +0100233 const u8 *addr, gfp_t gfp)
Jiri Bencf0706e822007-05-05 11:45:53 -0700234{
Johannes Bergd0709a62008-02-25 16:27:46 +0100235 struct ieee80211_local *local = sdata->local;
Jiri Bencf0706e822007-05-05 11:45:53 -0700236 struct sta_info *sta;
Mohammed Shafi Shajakhanebe27c92011-04-08 21:24:24 +0530237 struct timespec uptime;
Ron Rindjunsky16c5f152007-12-25 17:00:34 +0200238 int i;
Jiri Bencf0706e822007-05-05 11:45:53 -0700239
Johannes Berg17741cd2008-09-11 00:02:02 +0200240 sta = kzalloc(sizeof(*sta) + local->hw.sta_data_size, gfp);
Jiri Bencf0706e822007-05-05 11:45:53 -0700241 if (!sta)
Johannes Berg73651ee2008-02-25 16:27:47 +0100242 return NULL;
Jiri Bencf0706e822007-05-05 11:45:53 -0700243
Johannes Berg07346f812008-05-03 01:02:02 +0200244 spin_lock_init(&sta->lock);
Johannes Bergaf818582009-11-06 11:35:50 +0100245 INIT_WORK(&sta->drv_unblock_wk, sta_unblock);
Johannes Berg67c282c2010-06-10 10:21:43 +0200246 INIT_WORK(&sta->ampdu_mlme.work, ieee80211_ba_session_work);
Johannes Berga93e3642010-06-10 10:21:46 +0200247 mutex_init(&sta->ampdu_mlme.mtx);
Johannes Berg07346f812008-05-03 01:02:02 +0200248
Johannes Berg17741cd2008-09-11 00:02:02 +0200249 memcpy(sta->sta.addr, addr, ETH_ALEN);
Johannes Bergd0709a62008-02-25 16:27:46 +0100250 sta->local = local;
251 sta->sdata = sdata;
Felix Fietkau8bc8aec2011-03-21 20:01:00 +0100252 sta->last_rx = jiffies;
Jiri Bencf0706e822007-05-05 11:45:53 -0700253
Johannes Berg71ec3752012-01-20 13:55:20 +0100254 sta->sta_state = IEEE80211_STA_NONE;
255
Mohammed Shafi Shajakhanebe27c92011-04-08 21:24:24 +0530256 do_posix_clock_monotonic_gettime(&uptime);
257 sta->last_connected = uptime.tv_sec;
Bruno Randolf541a45a2010-12-02 19:12:43 +0900258 ewma_init(&sta->avg_signal, 1024, 8);
259
Johannes Bergaf65cd92009-11-17 18:18:36 +0100260 if (sta_prepare_rate_control(local, sta, gfp)) {
Jiri Bencf0706e822007-05-05 11:45:53 -0700261 kfree(sta);
Johannes Berg73651ee2008-02-25 16:27:47 +0100262 return NULL;
Jiri Bencf0706e822007-05-05 11:45:53 -0700263 }
264
Ron Rindjunsky16c5f152007-12-25 17:00:34 +0200265 for (i = 0; i < STA_TID_NUM; i++) {
Johannes Berga622ab72010-06-10 10:21:39 +0200266 /*
267 * timer_to_tid must be initialized with identity mapping
268 * to enable session_timer's data differentiation. See
269 * sta_rx_agg_session_timer_expired for usage.
270 */
Ron Rindjunsky16c5f152007-12-25 17:00:34 +0200271 sta->timer_to_tid[i] = i;
Ron Rindjunsky16c5f152007-12-25 17:00:34 +0200272 }
Johannes Berg948d8872011-09-29 16:04:29 +0200273 for (i = 0; i < IEEE80211_NUM_ACS; i++) {
274 skb_queue_head_init(&sta->ps_tx_buf[i]);
275 skb_queue_head_init(&sta->tx_filtered[i]);
276 }
Johannes Berg73651ee2008-02-25 16:27:47 +0100277
Senthil Balasubramaniancccaec92009-05-14 18:42:08 +0530278 for (i = 0; i < NUM_RX_DATA_QUEUES; i++)
Alexey Dobriyan4be929b2010-05-24 14:33:03 -0700279 sta->last_seq_ctrl[i] = cpu_to_le16(USHRT_MAX);
Senthil Balasubramaniancccaec92009-05-14 18:42:08 +0530280
Johannes Berg73651ee2008-02-25 16:27:47 +0100281#ifdef CONFIG_MAC80211_VERBOSE_DEBUG
Joe Perches0fb9a9e2010-08-20 16:25:38 -0700282 wiphy_debug(local->hw.wiphy, "Allocated STA %pM\n", sta->sta.addr);
Johannes Berg73651ee2008-02-25 16:27:47 +0100283#endif /* CONFIG_MAC80211_VERBOSE_DEBUG */
284
Johannes Berg03e44972008-02-27 09:56:40 +0100285#ifdef CONFIG_MAC80211_MESH
Javier Cardona57cf8042011-05-13 10:45:43 -0700286 sta->plink_state = NL80211_PLINK_LISTEN;
Johannes Berg03e44972008-02-27 09:56:40 +0100287 init_timer(&sta->plink_timer);
288#endif
289
Johannes Berg73651ee2008-02-25 16:27:47 +0100290 return sta;
291}
292
Guy Eilam8c71df72011-08-17 15:18:14 +0300293static int sta_info_insert_check(struct sta_info *sta)
Johannes Berg34e89502010-02-03 13:59:58 +0100294{
Johannes Berg34e89502010-02-03 13:59:58 +0100295 struct ieee80211_sub_if_data *sdata = sta->sdata;
Johannes Berg34e89502010-02-03 13:59:58 +0100296
Johannes Berg03e44972008-02-27 09:56:40 +0100297 /*
298 * Can't be a WARN_ON because it can be triggered through a race:
299 * something inserts a STA (on one CPU) without holding the RTNL
300 * and another CPU turns off the net device.
301 */
Guy Eilam8c71df72011-08-17 15:18:14 +0300302 if (unlikely(!ieee80211_sdata_running(sdata)))
303 return -ENETDOWN;
Johannes Berg03e44972008-02-27 09:56:40 +0100304
Johannes Berg47846c92009-11-25 17:46:19 +0100305 if (WARN_ON(compare_ether_addr(sta->sta.addr, sdata->vif.addr) == 0 ||
Guy Eilam8c71df72011-08-17 15:18:14 +0300306 is_multicast_ether_addr(sta->sta.addr)))
307 return -EINVAL;
308
309 return 0;
310}
311
Johannes Bergf09603a2012-01-20 13:55:21 +0100312static int sta_info_insert_drv_state(struct ieee80211_local *local,
313 struct ieee80211_sub_if_data *sdata,
314 struct sta_info *sta)
315{
316 enum ieee80211_sta_state state;
317 int err = 0;
318
319 for (state = IEEE80211_STA_NOTEXIST; state < sta->sta_state; state++) {
320 err = drv_sta_state(local, sdata, sta, state, state + 1);
321 if (err)
322 break;
323 }
324
325 if (!err) {
Johannes Berga4ec45a2012-01-20 13:55:22 +0100326 /*
327 * Drivers using legacy sta_add/sta_remove callbacks only
328 * get uploaded set to true after sta_add is called.
329 */
330 if (!local->ops->sta_add)
331 sta->uploaded = true;
Johannes Bergf09603a2012-01-20 13:55:21 +0100332 return 0;
333 }
334
335 if (sdata->vif.type == NL80211_IFTYPE_ADHOC) {
336 printk(KERN_DEBUG
337 "%s: failed to move IBSS STA %pM to state %d (%d) - keeping it anyway.\n",
338 sdata->name, sta->sta.addr, state + 1, err);
339 err = 0;
340 }
341
342 /* unwind on error */
343 for (; state > IEEE80211_STA_NOTEXIST; state--)
344 WARN_ON(drv_sta_state(local, sdata, sta, state, state - 1));
345
346 return err;
347}
348
Guy Eilam8c71df72011-08-17 15:18:14 +0300349/*
350 * should be called with sta_mtx locked
351 * this function replaces the mutex lock
352 * with a RCU lock
353 */
Johannes Berg4d339602011-12-15 11:24:20 +0100354static int sta_info_insert_finish(struct sta_info *sta) __acquires(RCU)
Guy Eilam8c71df72011-08-17 15:18:14 +0300355{
356 struct ieee80211_local *local = sta->local;
357 struct ieee80211_sub_if_data *sdata = sta->sdata;
Johannes Berg7852e362012-01-20 13:55:24 +0100358 struct station_info sinfo;
Guy Eilam8c71df72011-08-17 15:18:14 +0300359 int err = 0;
360
361 lockdep_assert_held(&local->sta_mtx);
Johannes Berg34e89502010-02-03 13:59:58 +0100362
Johannes Berg7852e362012-01-20 13:55:24 +0100363 /* check if STA exists already */
364 if (sta_info_get_bss(sdata, sta->sta.addr)) {
365 err = -EEXIST;
366 goto out_err;
Johannes Berg43ba7e92008-02-21 14:09:30 +0100367 }
Johannes Berg32bfd352007-12-19 01:31:26 +0100368
Johannes Berg7852e362012-01-20 13:55:24 +0100369 /* notify driver */
370 err = sta_info_insert_drv_state(local, sdata, sta);
371 if (err)
372 goto out_err;
Johannes Berg32bfd352007-12-19 01:31:26 +0100373
Johannes Berg7852e362012-01-20 13:55:24 +0100374 local->num_sta++;
375 local->sta_generation++;
376 smp_mb();
Johannes Berg4d339602011-12-15 11:24:20 +0100377
Johannes Berg7852e362012-01-20 13:55:24 +0100378 /* make the station visible */
379 sta_info_hash_add(local, sta);
Johannes Berg4d339602011-12-15 11:24:20 +0100380
Johannes Berg7852e362012-01-20 13:55:24 +0100381 list_add(&sta->list, &local->sta_list);
Johannes Berg83d5cc02012-01-12 09:31:10 +0100382
Johannes Berg7852e362012-01-20 13:55:24 +0100383 set_sta_flag(sta, WLAN_STA_INSERTED);
Johannes Berg4d339602011-12-15 11:24:20 +0100384
Johannes Berg7852e362012-01-20 13:55:24 +0100385 ieee80211_sta_debugfs_add(sta);
386 rate_control_add_sta_debugfs(sta);
Johannes Berg4d339602011-12-15 11:24:20 +0100387
Johannes Berg7852e362012-01-20 13:55:24 +0100388 memset(&sinfo, 0, sizeof(sinfo));
389 sinfo.filled = 0;
390 sinfo.generation = local->sta_generation;
391 cfg80211_new_sta(sdata->dev, sta->sta.addr, &sinfo, GFP_KERNEL);
Johannes Bergd0709a62008-02-25 16:27:46 +0100392
Jiri Bencf0706e822007-05-05 11:45:53 -0700393#ifdef CONFIG_MAC80211_VERBOSE_DEBUG
Johannes Berg7852e362012-01-20 13:55:24 +0100394 wiphy_debug(local->hw.wiphy, "Inserted STA %pM\n", sta->sta.addr);
Jiri Bencf0706e822007-05-05 11:45:53 -0700395#endif /* CONFIG_MAC80211_VERBOSE_DEBUG */
396
Johannes Berg34e89502010-02-03 13:59:58 +0100397 /* move reference to rcu-protected */
398 rcu_read_lock();
399 mutex_unlock(&local->sta_mtx);
Jiri Bence9f207f2007-05-05 11:46:38 -0700400
Johannes Berg73651ee2008-02-25 16:27:47 +0100401 if (ieee80211_vif_is_mesh(&sdata->vif))
402 mesh_accept_plinks_update(sdata);
403
404 return 0;
Johannes Berg4d339602011-12-15 11:24:20 +0100405 out_err:
406 mutex_unlock(&local->sta_mtx);
407 rcu_read_lock();
408 return err;
Guy Eilam8c71df72011-08-17 15:18:14 +0300409}
410
411int sta_info_insert_rcu(struct sta_info *sta) __acquires(RCU)
412{
413 struct ieee80211_local *local = sta->local;
Guy Eilam8c71df72011-08-17 15:18:14 +0300414 int err = 0;
415
Johannes Berg4d339602011-12-15 11:24:20 +0100416 might_sleep();
417
Guy Eilam8c71df72011-08-17 15:18:14 +0300418 err = sta_info_insert_check(sta);
419 if (err) {
Jiri Bencf0706e822007-05-05 11:45:53 -0700420 rcu_read_lock();
421 goto out_free;
422 }
423
Johannes Berg004c8722008-02-20 11:21:35 +0100424 mutex_lock(&local->sta_mtx);
425
Johannes Berg4d339602011-12-15 11:24:20 +0100426 err = sta_info_insert_finish(sta);
Guy Eilam8c71df72011-08-17 15:18:14 +0300427 if (err)
Johannes Berg004c8722008-02-20 11:21:35 +0100428 goto out_free;
Johannes Bergd0709a62008-02-25 16:27:46 +0100429
Johannes Berg004c8722008-02-20 11:21:35 +0100430 return 0;
Johannes Berg93e5deb2008-04-01 15:21:00 +0200431 out_free:
432 BUG_ON(!err);
Johannes Bergd9a7ddb2011-12-14 12:35:30 +0100433 sta_info_free(local, sta);
Johannes Berg93e5deb2008-04-01 15:21:00 +0200434 return err;
Jiri Bencf0706e822007-05-05 11:45:53 -0700435}
436
Johannes Berg34e89502010-02-03 13:59:58 +0100437int sta_info_insert(struct sta_info *sta)
438{
439 int err = sta_info_insert_rcu(sta);
440
441 rcu_read_unlock();
442
443 return err;
444}
445
Jiri Bencf0706e822007-05-05 11:45:53 -0700446static inline void __bss_tim_set(struct ieee80211_if_ap *bss, u16 aid)
Johannes Berg004c8722008-02-20 11:21:35 +0100447{
448 /*
449 * This format has been mandated by the IEEE specifications,
450 * so this line may not be changed to use the __set_bit() format.
451 */
452 bss->tim[aid / 8] |= (1 << (aid % 8));
453}
454
455static inline void __bss_tim_clear(struct ieee80211_if_ap *bss, u16 aid)
456{
457 /*
458 * This format has been mandated by the IEEE specifications,
459 * so this line may not be changed to use the __clear_bit() format.
460 */
461 bss->tim[aid / 8] &= ~(1 << (aid % 8));
462}
463
Johannes Berg948d8872011-09-29 16:04:29 +0200464static unsigned long ieee80211_tids_for_ac(int ac)
Johannes Berg004c8722008-02-20 11:21:35 +0100465{
Johannes Berg948d8872011-09-29 16:04:29 +0200466 /* If we ever support TIDs > 7, this obviously needs to be adjusted */
467 switch (ac) {
468 case IEEE80211_AC_VO:
469 return BIT(6) | BIT(7);
470 case IEEE80211_AC_VI:
471 return BIT(4) | BIT(5);
472 case IEEE80211_AC_BE:
473 return BIT(0) | BIT(3);
474 case IEEE80211_AC_BK:
475 return BIT(1) | BIT(2);
476 default:
477 WARN_ON(1);
478 return 0;
Johannes Bergd0709a62008-02-25 16:27:46 +0100479 }
Johannes Berg004c8722008-02-20 11:21:35 +0100480}
481
Johannes Bergc868cb32011-09-29 16:04:27 +0200482void sta_info_recalc_tim(struct sta_info *sta)
Johannes Berg004c8722008-02-20 11:21:35 +0100483{
Johannes Bergc868cb32011-09-29 16:04:27 +0200484 struct ieee80211_local *local = sta->local;
485 struct ieee80211_if_ap *bss = sta->sdata->bss;
Johannes Bergd0709a62008-02-25 16:27:46 +0100486 unsigned long flags;
Johannes Berg948d8872011-09-29 16:04:29 +0200487 bool indicate_tim = false;
488 u8 ignore_for_tim = sta->sta.uapsd_queues;
489 int ac;
Johannes Berg004c8722008-02-20 11:21:35 +0100490
Johannes Bergc868cb32011-09-29 16:04:27 +0200491 if (WARN_ON_ONCE(!sta->sdata->bss))
492 return;
Johannes Berg3e122be2008-07-09 14:40:34 +0200493
Johannes Bergc868cb32011-09-29 16:04:27 +0200494 /* No need to do anything if the driver does all */
495 if (local->hw.flags & IEEE80211_HW_AP_LINK_PS)
496 return;
Johannes Berg004c8722008-02-20 11:21:35 +0100497
Johannes Bergc868cb32011-09-29 16:04:27 +0200498 if (sta->dead)
499 goto done;
Johannes Berg3e122be2008-07-09 14:40:34 +0200500
Johannes Berg948d8872011-09-29 16:04:29 +0200501 /*
502 * If all ACs are delivery-enabled then we should build
503 * the TIM bit for all ACs anyway; if only some are then
504 * we ignore those and build the TIM bit using only the
505 * non-enabled ones.
506 */
507 if (ignore_for_tim == BIT(IEEE80211_NUM_ACS) - 1)
508 ignore_for_tim = 0;
Johannes Berg3e122be2008-07-09 14:40:34 +0200509
Johannes Berg948d8872011-09-29 16:04:29 +0200510 for (ac = 0; ac < IEEE80211_NUM_ACS; ac++) {
511 unsigned long tids;
512
513 if (ignore_for_tim & BIT(ac))
514 continue;
515
516 indicate_tim |= !skb_queue_empty(&sta->tx_filtered[ac]) ||
517 !skb_queue_empty(&sta->ps_tx_buf[ac]);
518 if (indicate_tim)
519 break;
520
521 tids = ieee80211_tids_for_ac(ac);
522
523 indicate_tim |=
524 sta->driver_buffered_tids & tids;
Johannes Bergd0709a62008-02-25 16:27:46 +0100525 }
Johannes Berg004c8722008-02-20 11:21:35 +0100526
Johannes Bergc868cb32011-09-29 16:04:27 +0200527 done:
Johannes Berg4d339602011-12-15 11:24:20 +0100528 spin_lock_irqsave(&local->tim_lock, flags);
Johannes Berg004c8722008-02-20 11:21:35 +0100529
Johannes Berg948d8872011-09-29 16:04:29 +0200530 if (indicate_tim)
Johannes Bergc868cb32011-09-29 16:04:27 +0200531 __bss_tim_set(bss, sta->sta.aid);
532 else
533 __bss_tim_clear(bss, sta->sta.aid);
Johannes Berg3e122be2008-07-09 14:40:34 +0200534
Johannes Bergc868cb32011-09-29 16:04:27 +0200535 if (local->ops->set_tim) {
536 local->tim_in_locked_section = true;
Johannes Berg948d8872011-09-29 16:04:29 +0200537 drv_set_tim(local, &sta->sta, indicate_tim);
Johannes Bergc868cb32011-09-29 16:04:27 +0200538 local->tim_in_locked_section = false;
Johannes Berg004c8722008-02-20 11:21:35 +0100539 }
Johannes Berg004c8722008-02-20 11:21:35 +0100540
Johannes Berg4d339602011-12-15 11:24:20 +0100541 spin_unlock_irqrestore(&local->tim_lock, flags);
Johannes Berg004c8722008-02-20 11:21:35 +0100542}
543
Johannes Bergcd0b8d82011-09-06 14:13:06 +0200544static bool sta_info_buffer_expired(struct sta_info *sta, struct sk_buff *skb)
Jiri Bencf0706e822007-05-05 11:45:53 -0700545{
Johannes Berge039fa42008-05-15 12:55:29 +0200546 struct ieee80211_tx_info *info;
Jiri Bencf0706e822007-05-05 11:45:53 -0700547 int timeout;
548
549 if (!skb)
Johannes Bergcd0b8d82011-09-06 14:13:06 +0200550 return false;
Jiri Bencf0706e822007-05-05 11:45:53 -0700551
Johannes Berge039fa42008-05-15 12:55:29 +0200552 info = IEEE80211_SKB_CB(skb);
Jiri Bencf0706e822007-05-05 11:45:53 -0700553
554 /* Timeout: (2 * listen_interval * beacon_int * 1024 / 1000000) sec */
Johannes Berg57c4d7b2009-04-23 16:10:04 +0200555 timeout = (sta->listen_interval *
556 sta->sdata->vif.bss_conf.beacon_int *
557 32 / 15625) * HZ;
Jiri Bencf0706e822007-05-05 11:45:53 -0700558 if (timeout < STA_TX_BUFFER_EXPIRE)
559 timeout = STA_TX_BUFFER_EXPIRE;
Johannes Berge039fa42008-05-15 12:55:29 +0200560 return time_after(jiffies, info->control.jiffies + timeout);
Jiri Bencf0706e822007-05-05 11:45:53 -0700561}
562
563
Johannes Berg948d8872011-09-29 16:04:29 +0200564static bool sta_info_cleanup_expire_buffered_ac(struct ieee80211_local *local,
565 struct sta_info *sta, int ac)
Jiri Bencf0706e822007-05-05 11:45:53 -0700566{
567 unsigned long flags;
568 struct sk_buff *skb;
569
Johannes Berg60750392011-09-29 16:04:28 +0200570 /*
571 * First check for frames that should expire on the filtered
572 * queue. Frames here were rejected by the driver and are on
573 * a separate queue to avoid reordering with normal PS-buffered
574 * frames. They also aren't accounted for right now in the
575 * total_ps_buffered counter.
576 */
Jiri Bencf0706e822007-05-05 11:45:53 -0700577 for (;;) {
Johannes Berg948d8872011-09-29 16:04:29 +0200578 spin_lock_irqsave(&sta->tx_filtered[ac].lock, flags);
579 skb = skb_peek(&sta->tx_filtered[ac]);
Johannes Berg57c4d7b2009-04-23 16:10:04 +0200580 if (sta_info_buffer_expired(sta, skb))
Johannes Berg948d8872011-09-29 16:04:29 +0200581 skb = __skb_dequeue(&sta->tx_filtered[ac]);
Johannes Berg836341a2008-02-20 02:07:21 +0100582 else
Jiri Bencf0706e822007-05-05 11:45:53 -0700583 skb = NULL;
Johannes Berg948d8872011-09-29 16:04:29 +0200584 spin_unlock_irqrestore(&sta->tx_filtered[ac].lock, flags);
Jiri Bencf0706e822007-05-05 11:45:53 -0700585
Johannes Berg60750392011-09-29 16:04:28 +0200586 /*
587 * Frames are queued in order, so if this one
588 * hasn't expired yet we can stop testing. If
589 * we actually reached the end of the queue we
590 * also need to stop, of course.
591 */
592 if (!skb)
593 break;
594 dev_kfree_skb(skb);
595 }
596
597 /*
598 * Now also check the normal PS-buffered queue, this will
599 * only find something if the filtered queue was emptied
600 * since the filtered frames are all before the normal PS
601 * buffered frames.
602 */
Jiri Bencf0706e822007-05-05 11:45:53 -0700603 for (;;) {
Johannes Berg948d8872011-09-29 16:04:29 +0200604 spin_lock_irqsave(&sta->ps_tx_buf[ac].lock, flags);
605 skb = skb_peek(&sta->ps_tx_buf[ac]);
Jiri Bencf0706e822007-05-05 11:45:53 -0700606 if (sta_info_buffer_expired(sta, skb))
Johannes Berg948d8872011-09-29 16:04:29 +0200607 skb = __skb_dequeue(&sta->ps_tx_buf[ac]);
Jiri Bencf0706e822007-05-05 11:45:53 -0700608 else
609 skb = NULL;
Johannes Berg948d8872011-09-29 16:04:29 +0200610 spin_unlock_irqrestore(&sta->ps_tx_buf[ac].lock, flags);
Jiri Bencf0706e822007-05-05 11:45:53 -0700611
Johannes Berg60750392011-09-29 16:04:28 +0200612 /*
613 * frames are queued in order, so if this one
614 * hasn't expired yet (or we reached the end of
615 * the queue) we can stop testing
616 */
Johannes Berg836341a2008-02-20 02:07:21 +0100617 if (!skb)
Jiri Bencf0706e822007-05-05 11:45:53 -0700618 break;
Johannes Berg836341a2008-02-20 02:07:21 +0100619
Johannes Berg836341a2008-02-20 02:07:21 +0100620 local->total_ps_buffered--;
Johannes Bergf4ea83d2008-06-30 15:10:46 +0200621#ifdef CONFIG_MAC80211_VERBOSE_PS_DEBUG
Johannes Berg0c68ae262008-10-27 15:56:10 -0700622 printk(KERN_DEBUG "Buffered frame expired (STA %pM)\n",
623 sta->sta.addr);
Johannes Bergf4ea83d2008-06-30 15:10:46 +0200624#endif
Johannes Berg836341a2008-02-20 02:07:21 +0100625 dev_kfree_skb(skb);
Jiri Bencf0706e822007-05-05 11:45:53 -0700626 }
Juuso Oikarinen3393a602010-04-19 10:12:52 +0300627
Johannes Berg60750392011-09-29 16:04:28 +0200628 /*
629 * Finally, recalculate the TIM bit for this station -- it might
630 * now be clear because the station was too slow to retrieve its
631 * frames.
632 */
633 sta_info_recalc_tim(sta);
634
635 /*
636 * Return whether there are any frames still buffered, this is
637 * used to check whether the cleanup timer still needs to run,
638 * if there are no frames we don't need to rearm the timer.
639 */
Johannes Berg948d8872011-09-29 16:04:29 +0200640 return !(skb_queue_empty(&sta->ps_tx_buf[ac]) &&
641 skb_queue_empty(&sta->tx_filtered[ac]));
642}
643
644static bool sta_info_cleanup_expire_buffered(struct ieee80211_local *local,
645 struct sta_info *sta)
646{
647 bool have_buffered = false;
648 int ac;
649
650 /* This is only necessary for stations on BSS interfaces */
651 if (!sta->sdata->bss)
652 return false;
653
654 for (ac = 0; ac < IEEE80211_NUM_ACS; ac++)
655 have_buffered |=
656 sta_info_cleanup_expire_buffered_ac(local, sta, ac);
657
658 return have_buffered;
Jiri Bencf0706e822007-05-05 11:45:53 -0700659}
660
Johannes Berg83d5cc02012-01-12 09:31:10 +0100661int __must_check __sta_info_destroy(struct sta_info *sta)
Johannes Berg34e89502010-02-03 13:59:58 +0100662{
663 struct ieee80211_local *local;
664 struct ieee80211_sub_if_data *sdata;
Johannes Berg948d8872011-09-29 16:04:29 +0200665 int ret, i, ac;
Yogesh Ashok Powar42624d42011-12-08 14:56:15 +0530666 struct tid_ampdu_tx *tid_tx;
Johannes Berg34e89502010-02-03 13:59:58 +0100667
668 might_sleep();
669
670 if (!sta)
671 return -ENOENT;
672
673 local = sta->local;
674 sdata = sta->sdata;
675
Johannes Berg83d5cc02012-01-12 09:31:10 +0100676 lockdep_assert_held(&local->sta_mtx);
677
Johannes Berg098a6072010-04-06 11:18:47 +0200678 /*
679 * Before removing the station from the driver and
680 * rate control, it might still start new aggregation
681 * sessions -- block that to make sure the tear-down
682 * will be sufficient.
683 */
Johannes Bergc2c98fd2011-09-29 16:04:36 +0200684 set_sta_flag(sta, WLAN_STA_BLOCK_BA);
Johannes Berg53f73c02010-10-05 19:37:40 +0200685 ieee80211_sta_tear_down_BA_sessions(sta, true);
Johannes Berg098a6072010-04-06 11:18:47 +0200686
Johannes Berg34e89502010-02-03 13:59:58 +0100687 ret = sta_info_hash_del(local, sta);
Johannes Berg34e89502010-02-03 13:59:58 +0100688 if (ret)
689 return ret;
690
Johannes Berg4d339602011-12-15 11:24:20 +0100691 list_del(&sta->list);
692
Johannes Berg8cb23152011-05-12 15:07:15 +0200693 mutex_lock(&local->key_mtx);
Johannes Berge31b8212010-10-05 19:39:30 +0200694 for (i = 0; i < NUM_DEFAULT_KEYS; i++)
Johannes Berg40b275b2011-05-13 14:15:49 +0200695 __ieee80211_key_free(key_mtx_dereference(local, sta->gtk[i]));
Johannes Berge31b8212010-10-05 19:39:30 +0200696 if (sta->ptk)
Johannes Berg40b275b2011-05-13 14:15:49 +0200697 __ieee80211_key_free(key_mtx_dereference(local, sta->ptk));
Johannes Berg8cb23152011-05-12 15:07:15 +0200698 mutex_unlock(&local->key_mtx);
Johannes Berg34e89502010-02-03 13:59:58 +0100699
700 sta->dead = true;
701
Johannes Berg34e89502010-02-03 13:59:58 +0100702 local->num_sta--;
703 local->sta_generation++;
704
705 if (sdata->vif.type == NL80211_IFTYPE_AP_VLAN)
Stephen Hemmingera9b3cd72011-08-01 16:19:00 +0000706 RCU_INIT_POINTER(sdata->u.vlan.sta, NULL);
Johannes Berg34e89502010-02-03 13:59:58 +0100707
Johannes Berg83d5cc02012-01-12 09:31:10 +0100708 while (sta->sta_state > IEEE80211_STA_NONE) {
Johannes Bergf09603a2012-01-20 13:55:21 +0100709 ret = sta_info_move_state(sta, sta->sta_state - 1);
710 if (ret) {
Johannes Berg83d5cc02012-01-12 09:31:10 +0100711 WARN_ON_ONCE(1);
712 break;
713 }
714 }
Johannes Bergd9a7ddb2011-12-14 12:35:30 +0100715
Johannes Bergf09603a2012-01-20 13:55:21 +0100716 if (sta->uploaded) {
Johannes Bergf09603a2012-01-20 13:55:21 +0100717 ret = drv_sta_state(local, sdata, sta, IEEE80211_STA_NONE,
718 IEEE80211_STA_NOTEXIST);
719 WARN_ON_ONCE(ret != 0);
720 }
Johannes Berg34e89502010-02-03 13:59:58 +0100721
Johannes Berge64b3792010-04-06 11:18:43 +0200722 /*
723 * At this point, after we wait for an RCU grace period,
724 * neither mac80211 nor the driver can reference this
725 * sta struct any more except by still existing timers
726 * associated with this station that we clean up below.
727 */
728 synchronize_rcu();
729
Helmut Schaa4f3eb0b2012-01-27 11:02:53 +0100730 if (test_sta_flag(sta, WLAN_STA_PS_STA)) {
731 BUG_ON(!sdata->bss);
732
733 clear_sta_flag(sta, WLAN_STA_PS_STA);
734
735 atomic_dec(&sdata->bss->num_sta_ps);
736 sta_info_recalc_tim(sta);
737 }
738
Johannes Berg948d8872011-09-29 16:04:29 +0200739 for (ac = 0; ac < IEEE80211_NUM_ACS; ac++) {
740 local->total_ps_buffered -= skb_queue_len(&sta->ps_tx_buf[ac]);
741 __skb_queue_purge(&sta->ps_tx_buf[ac]);
742 __skb_queue_purge(&sta->tx_filtered[ac]);
743 }
Johannes Bergc868cb32011-09-29 16:04:27 +0200744
Johannes Berg34e89502010-02-03 13:59:58 +0100745#ifdef CONFIG_MAC80211_MESH
Johannes Berge64b3792010-04-06 11:18:43 +0200746 if (ieee80211_vif_is_mesh(&sdata->vif))
Johannes Berg34e89502010-02-03 13:59:58 +0100747 mesh_accept_plinks_update(sdata);
Johannes Berg34e89502010-02-03 13:59:58 +0100748#endif
749
750#ifdef CONFIG_MAC80211_VERBOSE_DEBUG
Joe Perches0fb9a9e2010-08-20 16:25:38 -0700751 wiphy_debug(local->hw.wiphy, "Removed STA %pM\n", sta->sta.addr);
Johannes Berg34e89502010-02-03 13:59:58 +0100752#endif /* CONFIG_MAC80211_VERBOSE_DEBUG */
753 cancel_work_sync(&sta->drv_unblock_wk);
754
Jouni Malinenec15e682011-03-23 15:29:52 +0200755 cfg80211_del_sta(sdata->dev, sta->sta.addr, GFP_KERNEL);
756
Johannes Berg34e89502010-02-03 13:59:58 +0100757 rate_control_remove_sta_debugfs(sta);
758 ieee80211_sta_debugfs_remove(sta);
759
760#ifdef CONFIG_MAC80211_MESH
761 if (ieee80211_vif_is_mesh(&sta->sdata->vif)) {
762 mesh_plink_deactivate(sta);
763 del_timer_sync(&sta->plink_timer);
764 }
765#endif
766
Johannes Berg151a02f2012-01-17 10:30:01 +0100767 /*
768 * Destroy aggregation state here. It would be nice to wait for the
769 * driver to finish aggregation stop and then clean up, but for now
770 * drivers have to handle aggregation stop being requested, followed
771 * directly by station destruction.
Yogesh Ashok Powar42624d42011-12-08 14:56:15 +0530772 */
773 for (i = 0; i < STA_TID_NUM; i++) {
Johannes Berg151a02f2012-01-17 10:30:01 +0100774 tid_tx = rcu_dereference_raw(sta->ampdu_mlme.tid_tx[i]);
Yogesh Ashok Powar27bf8882011-12-16 11:47:15 +0530775 if (!tid_tx)
Yogesh Ashok Powar42624d42011-12-08 14:56:15 +0530776 continue;
Johannes Berg151a02f2012-01-17 10:30:01 +0100777 __skb_queue_purge(&tid_tx->pending);
778 kfree(tid_tx);
Yogesh Ashok Powar42624d42011-12-08 14:56:15 +0530779 }
780
Johannes Bergd9a7ddb2011-12-14 12:35:30 +0100781 sta_info_free(local, sta);
Johannes Berg34e89502010-02-03 13:59:58 +0100782
783 return 0;
784}
785
786int sta_info_destroy_addr(struct ieee80211_sub_if_data *sdata, const u8 *addr)
787{
788 struct sta_info *sta;
789 int ret;
790
791 mutex_lock(&sdata->local->sta_mtx);
Johannes Berg7852e362012-01-20 13:55:24 +0100792 sta = sta_info_get(sdata, addr);
Johannes Berg34e89502010-02-03 13:59:58 +0100793 ret = __sta_info_destroy(sta);
794 mutex_unlock(&sdata->local->sta_mtx);
795
796 return ret;
797}
798
799int sta_info_destroy_addr_bss(struct ieee80211_sub_if_data *sdata,
800 const u8 *addr)
801{
802 struct sta_info *sta;
803 int ret;
804
805 mutex_lock(&sdata->local->sta_mtx);
Johannes Berg7852e362012-01-20 13:55:24 +0100806 sta = sta_info_get_bss(sdata, addr);
Johannes Berg34e89502010-02-03 13:59:58 +0100807 ret = __sta_info_destroy(sta);
808 mutex_unlock(&sdata->local->sta_mtx);
809
810 return ret;
811}
Jiri Bencf0706e822007-05-05 11:45:53 -0700812
813static void sta_info_cleanup(unsigned long data)
814{
815 struct ieee80211_local *local = (struct ieee80211_local *) data;
816 struct sta_info *sta;
Juuso Oikarinen3393a602010-04-19 10:12:52 +0300817 bool timer_needed = false;
Jiri Bencf0706e822007-05-05 11:45:53 -0700818
Johannes Bergd0709a62008-02-25 16:27:46 +0100819 rcu_read_lock();
820 list_for_each_entry_rcu(sta, &local->sta_list, list)
Juuso Oikarinen3393a602010-04-19 10:12:52 +0300821 if (sta_info_cleanup_expire_buffered(local, sta))
822 timer_needed = true;
Johannes Bergd0709a62008-02-25 16:27:46 +0100823 rcu_read_unlock();
Jiri Bencf0706e822007-05-05 11:45:53 -0700824
Johannes Berg5bb644a2009-05-17 11:40:42 +0200825 if (local->quiescing)
826 return;
827
Juuso Oikarinen3393a602010-04-19 10:12:52 +0300828 if (!timer_needed)
829 return;
830
Johannes Berg26d59532011-04-01 13:52:48 +0200831 mod_timer(&local->sta_cleanup,
832 round_jiffies(jiffies + STA_INFO_CLEANUP_INTERVAL));
Jiri Bencf0706e822007-05-05 11:45:53 -0700833}
834
835void sta_info_init(struct ieee80211_local *local)
836{
Johannes Berg4d339602011-12-15 11:24:20 +0100837 spin_lock_init(&local->tim_lock);
Johannes Berg34e89502010-02-03 13:59:58 +0100838 mutex_init(&local->sta_mtx);
Jiri Bencf0706e822007-05-05 11:45:53 -0700839 INIT_LIST_HEAD(&local->sta_list);
Jiri Bencf0706e822007-05-05 11:45:53 -0700840
Pavel Emelyanovb24b8a22008-01-23 21:20:07 -0800841 setup_timer(&local->sta_cleanup, sta_info_cleanup,
842 (unsigned long)local);
Jiri Bencf0706e822007-05-05 11:45:53 -0700843}
844
845void sta_info_stop(struct ieee80211_local *local)
846{
Jiri Bencf0706e822007-05-05 11:45:53 -0700847 del_timer(&local->sta_cleanup);
Michael Wube8755e2007-07-27 15:43:23 +0200848 sta_info_flush(local, NULL);
Jiri Bencf0706e822007-05-05 11:45:53 -0700849}
850
Jiri Bencf0706e822007-05-05 11:45:53 -0700851/**
852 * sta_info_flush - flush matching STA entries from the STA table
Johannes Berg44213b52008-02-25 16:27:49 +0100853 *
854 * Returns the number of removed STA entries.
855 *
Jiri Bencf0706e822007-05-05 11:45:53 -0700856 * @local: local interface data
Johannes Bergd0709a62008-02-25 16:27:46 +0100857 * @sdata: matching rule for the net device (sta->dev) or %NULL to match all STAs
Jiri Bencf0706e822007-05-05 11:45:53 -0700858 */
Johannes Berg44213b52008-02-25 16:27:49 +0100859int sta_info_flush(struct ieee80211_local *local,
Johannes Bergaf8cdcd2009-04-19 21:25:43 +0200860 struct ieee80211_sub_if_data *sdata)
Jiri Bencf0706e822007-05-05 11:45:53 -0700861{
862 struct sta_info *sta, *tmp;
Johannes Berg44213b52008-02-25 16:27:49 +0100863 int ret = 0;
Jiri Bencf0706e822007-05-05 11:45:53 -0700864
Johannes Bergd0709a62008-02-25 16:27:46 +0100865 might_sleep();
866
Johannes Berg34e89502010-02-03 13:59:58 +0100867 mutex_lock(&local->sta_mtx);
Johannes Berg34e89502010-02-03 13:59:58 +0100868 list_for_each_entry_safe(sta, tmp, &local->sta_list, list) {
Johannes Berg34316832012-02-25 21:40:46 +0100869 if (!sdata || sdata == sta->sdata) {
Johannes Berg34e89502010-02-03 13:59:58 +0100870 WARN_ON(__sta_info_destroy(sta));
Johannes Berg34316832012-02-25 21:40:46 +0100871 ret++;
872 }
Johannes Berg34e89502010-02-03 13:59:58 +0100873 }
874 mutex_unlock(&local->sta_mtx);
Johannes Berg44213b52008-02-25 16:27:49 +0100875
876 return ret;
Jiri Bencf0706e822007-05-05 11:45:53 -0700877}
Johannes Bergdc6676b2008-03-31 19:23:03 +0200878
Johannes Berg24723d12008-09-11 00:01:46 +0200879void ieee80211_sta_expire(struct ieee80211_sub_if_data *sdata,
880 unsigned long exp_time)
881{
882 struct ieee80211_local *local = sdata->local;
883 struct sta_info *sta, *tmp;
Johannes Berg24723d12008-09-11 00:01:46 +0200884
Johannes Berg34e89502010-02-03 13:59:58 +0100885 mutex_lock(&local->sta_mtx);
Mohammed Shafi Shajakhane46a2cf2011-12-26 10:43:29 +0530886
887 list_for_each_entry_safe(sta, tmp, &local->sta_list, list) {
Marek Lindnerec2b7742011-12-20 23:16:52 +0800888 if (sdata != sta->sdata)
889 continue;
890
Johannes Berg24723d12008-09-11 00:01:46 +0200891 if (time_after(jiffies, sta->last_rx + exp_time)) {
892#ifdef CONFIG_MAC80211_IBSS_DEBUG
Johannes Berg0c68ae262008-10-27 15:56:10 -0700893 printk(KERN_DEBUG "%s: expiring inactive STA %pM\n",
Johannes Berg47846c92009-11-25 17:46:19 +0100894 sdata->name, sta->sta.addr);
Johannes Berg24723d12008-09-11 00:01:46 +0200895#endif
Johannes Berg34e89502010-02-03 13:59:58 +0100896 WARN_ON(__sta_info_destroy(sta));
Johannes Berg24723d12008-09-11 00:01:46 +0200897 }
Mohammed Shafi Shajakhane46a2cf2011-12-26 10:43:29 +0530898 }
899
Johannes Berg34e89502010-02-03 13:59:58 +0100900 mutex_unlock(&local->sta_mtx);
Johannes Berg24723d12008-09-11 00:01:46 +0200901}
Johannes Berg17741cd2008-09-11 00:02:02 +0200902
Ben Greear686b9cb2010-09-23 09:44:36 -0700903struct ieee80211_sta *ieee80211_find_sta_by_ifaddr(struct ieee80211_hw *hw,
904 const u8 *addr,
905 const u8 *localaddr)
Johannes Berg17741cd2008-09-11 00:02:02 +0200906{
Johannes Bergabe60632009-11-25 17:46:18 +0100907 struct sta_info *sta, *nxt;
Johannes Berg17741cd2008-09-11 00:02:02 +0200908
Ben Greear686b9cb2010-09-23 09:44:36 -0700909 /*
910 * Just return a random station if localaddr is NULL
911 * ... first in list.
912 */
Johannes Bergf7c65592010-04-30 13:48:36 +0200913 for_each_sta_info(hw_to_local(hw), addr, sta, nxt) {
Ben Greear686b9cb2010-09-23 09:44:36 -0700914 if (localaddr &&
915 compare_ether_addr(sta->sdata->vif.addr, localaddr) != 0)
916 continue;
Johannes Bergf7c65592010-04-30 13:48:36 +0200917 if (!sta->uploaded)
918 return NULL;
Johannes Bergabe60632009-11-25 17:46:18 +0100919 return &sta->sta;
Johannes Bergf7c65592010-04-30 13:48:36 +0200920 }
921
Johannes Bergabe60632009-11-25 17:46:18 +0100922 return NULL;
Johannes Berg17741cd2008-09-11 00:02:02 +0200923}
Ben Greear686b9cb2010-09-23 09:44:36 -0700924EXPORT_SYMBOL_GPL(ieee80211_find_sta_by_ifaddr);
Johannes Berg5ed176e2009-11-04 14:42:28 +0100925
926struct ieee80211_sta *ieee80211_find_sta(struct ieee80211_vif *vif,
927 const u8 *addr)
928{
Johannes Bergf7c65592010-04-30 13:48:36 +0200929 struct sta_info *sta;
Johannes Berg5ed176e2009-11-04 14:42:28 +0100930
931 if (!vif)
932 return NULL;
933
Johannes Bergf7c65592010-04-30 13:48:36 +0200934 sta = sta_info_get_bss(vif_to_sdata(vif), addr);
935 if (!sta)
936 return NULL;
Johannes Berg5ed176e2009-11-04 14:42:28 +0100937
Johannes Bergf7c65592010-04-30 13:48:36 +0200938 if (!sta->uploaded)
939 return NULL;
940
941 return &sta->sta;
Johannes Berg5ed176e2009-11-04 14:42:28 +0100942}
Johannes Berg17741cd2008-09-11 00:02:02 +0200943EXPORT_SYMBOL(ieee80211_find_sta);
Johannes Bergaf818582009-11-06 11:35:50 +0100944
Johannes Berg50a94322010-11-16 11:50:28 -0800945static void clear_sta_ps_flags(void *_sta)
946{
947 struct sta_info *sta = _sta;
Helmut Schaa608383b2012-01-30 15:18:00 +0100948 struct ieee80211_sub_if_data *sdata = sta->sdata;
Johannes Berg50a94322010-11-16 11:50:28 -0800949
Johannes Bergc2c98fd2011-09-29 16:04:36 +0200950 clear_sta_flag(sta, WLAN_STA_PS_DRIVER);
Helmut Schaa608383b2012-01-30 15:18:00 +0100951 if (test_and_clear_sta_flag(sta, WLAN_STA_PS_STA))
952 atomic_dec(&sdata->bss->num_sta_ps);
Johannes Berg50a94322010-11-16 11:50:28 -0800953}
954
Johannes Bergaf818582009-11-06 11:35:50 +0100955/* powersave support code */
956void ieee80211_sta_ps_deliver_wakeup(struct sta_info *sta)
957{
958 struct ieee80211_sub_if_data *sdata = sta->sdata;
959 struct ieee80211_local *local = sdata->local;
Johannes Berg948d8872011-09-29 16:04:29 +0200960 struct sk_buff_head pending;
961 int filtered = 0, buffered = 0, ac;
Johannes Bergaf818582009-11-06 11:35:50 +0100962
Johannes Bergc2c98fd2011-09-29 16:04:36 +0200963 clear_sta_flag(sta, WLAN_STA_SP);
Johannes Berg47086fc2011-09-29 16:04:33 +0200964
Johannes Berg948d8872011-09-29 16:04:29 +0200965 BUILD_BUG_ON(BITS_TO_LONGS(STA_TID_NUM) > 1);
966 sta->driver_buffered_tids = 0;
967
Arik Nemtsovd057e5a2011-01-31 22:29:13 +0200968 if (!(local->hw.flags & IEEE80211_HW_AP_LINK_PS))
969 drv_sta_notify(local, sdata, STA_NOTIFY_AWAKE, &sta->sta);
Johannes Bergaf818582009-11-06 11:35:50 +0100970
Johannes Berg948d8872011-09-29 16:04:29 +0200971 skb_queue_head_init(&pending);
Johannes Bergaf818582009-11-06 11:35:50 +0100972
973 /* Send all buffered frames to the station */
Johannes Berg948d8872011-09-29 16:04:29 +0200974 for (ac = 0; ac < IEEE80211_NUM_ACS; ac++) {
975 int count = skb_queue_len(&pending), tmp;
976
977 skb_queue_splice_tail_init(&sta->tx_filtered[ac], &pending);
978 tmp = skb_queue_len(&pending);
979 filtered += tmp - count;
980 count = tmp;
981
982 skb_queue_splice_tail_init(&sta->ps_tx_buf[ac], &pending);
983 tmp = skb_queue_len(&pending);
984 buffered += tmp - count;
985 }
986
987 ieee80211_add_pending_skbs_fn(local, &pending, clear_sta_ps_flags, sta);
988
Johannes Bergaf818582009-11-06 11:35:50 +0100989 local->total_ps_buffered -= buffered;
990
Johannes Bergc868cb32011-09-29 16:04:27 +0200991 sta_info_recalc_tim(sta);
992
Johannes Bergaf818582009-11-06 11:35:50 +0100993#ifdef CONFIG_MAC80211_VERBOSE_PS_DEBUG
994 printk(KERN_DEBUG "%s: STA %pM aid %d sending %d filtered/%d PS frames "
Johannes Berg47846c92009-11-25 17:46:19 +0100995 "since STA not sleeping anymore\n", sdata->name,
Johannes Berg948d8872011-09-29 16:04:29 +0200996 sta->sta.addr, sta->sta.aid, filtered, buffered);
Johannes Bergaf818582009-11-06 11:35:50 +0100997#endif /* CONFIG_MAC80211_VERBOSE_PS_DEBUG */
998}
999
Johannes Bergce662b442011-09-29 16:04:34 +02001000static void ieee80211_send_null_response(struct ieee80211_sub_if_data *sdata,
1001 struct sta_info *sta, int tid,
Johannes Berg40b96402011-09-29 16:04:38 +02001002 enum ieee80211_frame_release_type reason)
Johannes Bergce662b442011-09-29 16:04:34 +02001003{
1004 struct ieee80211_local *local = sdata->local;
1005 struct ieee80211_qos_hdr *nullfunc;
1006 struct sk_buff *skb;
1007 int size = sizeof(*nullfunc);
1008 __le16 fc;
Johannes Bergc2c98fd2011-09-29 16:04:36 +02001009 bool qos = test_sta_flag(sta, WLAN_STA_WME);
Johannes Bergce662b442011-09-29 16:04:34 +02001010 struct ieee80211_tx_info *info;
1011
1012 if (qos) {
1013 fc = cpu_to_le16(IEEE80211_FTYPE_DATA |
1014 IEEE80211_STYPE_QOS_NULLFUNC |
1015 IEEE80211_FCTL_FROMDS);
1016 } else {
1017 size -= 2;
1018 fc = cpu_to_le16(IEEE80211_FTYPE_DATA |
1019 IEEE80211_STYPE_NULLFUNC |
1020 IEEE80211_FCTL_FROMDS);
1021 }
1022
1023 skb = dev_alloc_skb(local->hw.extra_tx_headroom + size);
1024 if (!skb)
1025 return;
1026
1027 skb_reserve(skb, local->hw.extra_tx_headroom);
1028
1029 nullfunc = (void *) skb_put(skb, size);
1030 nullfunc->frame_control = fc;
1031 nullfunc->duration_id = 0;
1032 memcpy(nullfunc->addr1, sta->sta.addr, ETH_ALEN);
1033 memcpy(nullfunc->addr2, sdata->vif.addr, ETH_ALEN);
1034 memcpy(nullfunc->addr3, sdata->vif.addr, ETH_ALEN);
1035
Johannes Berg59b66252011-10-13 13:19:19 +02001036 skb->priority = tid;
1037 skb_set_queue_mapping(skb, ieee802_1d_to_ac[tid]);
Johannes Bergce662b442011-09-29 16:04:34 +02001038 if (qos) {
Johannes Bergce662b442011-09-29 16:04:34 +02001039 nullfunc->qos_ctrl = cpu_to_le16(tid);
1040
Johannes Berg40b96402011-09-29 16:04:38 +02001041 if (reason == IEEE80211_FRAME_RELEASE_UAPSD)
Johannes Bergce662b442011-09-29 16:04:34 +02001042 nullfunc->qos_ctrl |=
1043 cpu_to_le16(IEEE80211_QOS_CTL_EOSP);
1044 }
1045
1046 info = IEEE80211_SKB_CB(skb);
1047
1048 /*
1049 * Tell TX path to send this frame even though the
1050 * STA may still remain is PS mode after this frame
Johannes Bergdeeaee12011-09-29 16:04:35 +02001051 * exchange. Also set EOSP to indicate this packet
1052 * ends the poll/service period.
Johannes Bergce662b442011-09-29 16:04:34 +02001053 */
Johannes Berg02f2f1a2012-02-27 12:18:30 +01001054 info->flags |= IEEE80211_TX_CTL_NO_PS_BUFFER |
Johannes Bergdeeaee12011-09-29 16:04:35 +02001055 IEEE80211_TX_STATUS_EOSP |
1056 IEEE80211_TX_CTL_REQ_TX_STATUS;
Johannes Bergce662b442011-09-29 16:04:34 +02001057
Johannes Berg40b96402011-09-29 16:04:38 +02001058 drv_allow_buffered_frames(local, sta, BIT(tid), 1, reason, false);
1059
Johannes Bergce662b442011-09-29 16:04:34 +02001060 ieee80211_xmit(sdata, skb);
1061}
1062
Johannes Berg47086fc2011-09-29 16:04:33 +02001063static void
1064ieee80211_sta_ps_deliver_response(struct sta_info *sta,
1065 int n_frames, u8 ignored_acs,
1066 enum ieee80211_frame_release_type reason)
Johannes Bergaf818582009-11-06 11:35:50 +01001067{
1068 struct ieee80211_sub_if_data *sdata = sta->sdata;
1069 struct ieee80211_local *local = sdata->local;
Johannes Berg4049e092011-09-29 16:04:32 +02001070 bool found = false;
Johannes Berg948d8872011-09-29 16:04:29 +02001071 bool more_data = false;
1072 int ac;
Johannes Berg4049e092011-09-29 16:04:32 +02001073 unsigned long driver_release_tids = 0;
Johannes Berg47086fc2011-09-29 16:04:33 +02001074 struct sk_buff_head frames;
1075
Johannes Bergdeeaee12011-09-29 16:04:35 +02001076 /* Service or PS-Poll period starts */
Johannes Bergc2c98fd2011-09-29 16:04:36 +02001077 set_sta_flag(sta, WLAN_STA_SP);
Johannes Bergdeeaee12011-09-29 16:04:35 +02001078
Johannes Berg47086fc2011-09-29 16:04:33 +02001079 __skb_queue_head_init(&frames);
Johannes Bergaf818582009-11-06 11:35:50 +01001080
Johannes Berg948d8872011-09-29 16:04:29 +02001081 /*
Johannes Berg47086fc2011-09-29 16:04:33 +02001082 * Get response frame(s) and more data bit for it.
Johannes Berg948d8872011-09-29 16:04:29 +02001083 */
1084 for (ac = 0; ac < IEEE80211_NUM_ACS; ac++) {
Johannes Berg4049e092011-09-29 16:04:32 +02001085 unsigned long tids;
1086
Johannes Berg47086fc2011-09-29 16:04:33 +02001087 if (ignored_acs & BIT(ac))
Johannes Berg948d8872011-09-29 16:04:29 +02001088 continue;
1089
Johannes Berg4049e092011-09-29 16:04:32 +02001090 tids = ieee80211_tids_for_ac(ac);
1091
1092 if (!found) {
1093 driver_release_tids = sta->driver_buffered_tids & tids;
1094 if (driver_release_tids) {
1095 found = true;
1096 } else {
Johannes Berg47086fc2011-09-29 16:04:33 +02001097 struct sk_buff *skb;
1098
1099 while (n_frames > 0) {
1100 skb = skb_dequeue(&sta->tx_filtered[ac]);
1101 if (!skb) {
1102 skb = skb_dequeue(
1103 &sta->ps_tx_buf[ac]);
1104 if (skb)
1105 local->total_ps_buffered--;
1106 }
1107 if (!skb)
1108 break;
1109 n_frames--;
Johannes Berg4049e092011-09-29 16:04:32 +02001110 found = true;
Johannes Berg47086fc2011-09-29 16:04:33 +02001111 __skb_queue_tail(&frames, skb);
1112 }
Johannes Berg4049e092011-09-29 16:04:32 +02001113 }
1114
1115 /*
1116 * If the driver has data on more than one TID then
1117 * certainly there's more data if we release just a
1118 * single frame now (from a single TID).
1119 */
Johannes Berg47086fc2011-09-29 16:04:33 +02001120 if (reason == IEEE80211_FRAME_RELEASE_PSPOLL &&
1121 hweight16(driver_release_tids) > 1) {
Johannes Berg4049e092011-09-29 16:04:32 +02001122 more_data = true;
1123 driver_release_tids =
1124 BIT(ffs(driver_release_tids) - 1);
1125 break;
Johannes Berg948d8872011-09-29 16:04:29 +02001126 }
1127 }
1128
Johannes Berg948d8872011-09-29 16:04:29 +02001129 if (!skb_queue_empty(&sta->tx_filtered[ac]) ||
1130 !skb_queue_empty(&sta->ps_tx_buf[ac])) {
1131 more_data = true;
1132 break;
1133 }
Johannes Bergaf818582009-11-06 11:35:50 +01001134 }
Johannes Bergaf818582009-11-06 11:35:50 +01001135
Johannes Berg4049e092011-09-29 16:04:32 +02001136 if (!found) {
Johannes Bergce662b442011-09-29 16:04:34 +02001137 int tid;
Johannes Berg4049e092011-09-29 16:04:32 +02001138
Johannes Bergce662b442011-09-29 16:04:34 +02001139 /*
1140 * For PS-Poll, this can only happen due to a race condition
1141 * when we set the TIM bit and the station notices it, but
1142 * before it can poll for the frame we expire it.
1143 *
1144 * For uAPSD, this is said in the standard (11.2.1.5 h):
1145 * At each unscheduled SP for a non-AP STA, the AP shall
1146 * attempt to transmit at least one MSDU or MMPDU, but no
1147 * more than the value specified in the Max SP Length field
1148 * in the QoS Capability element from delivery-enabled ACs,
1149 * that are destined for the non-AP STA.
1150 *
1151 * Since we have no other MSDU/MMPDU, transmit a QoS null frame.
1152 */
1153
1154 /* This will evaluate to 1, 3, 5 or 7. */
1155 tid = 7 - ((ffs(~ignored_acs) - 1) << 1);
1156
Johannes Berg40b96402011-09-29 16:04:38 +02001157 ieee80211_send_null_response(sdata, sta, tid, reason);
Johannes Berg4049e092011-09-29 16:04:32 +02001158 return;
1159 }
1160
Johannes Berg47086fc2011-09-29 16:04:33 +02001161 if (!driver_release_tids) {
1162 struct sk_buff_head pending;
1163 struct sk_buff *skb;
Johannes Berg40b96402011-09-29 16:04:38 +02001164 int num = 0;
1165 u16 tids = 0;
Johannes Bergaf818582009-11-06 11:35:50 +01001166
Johannes Berg47086fc2011-09-29 16:04:33 +02001167 skb_queue_head_init(&pending);
Johannes Bergaf818582009-11-06 11:35:50 +01001168
Johannes Berg47086fc2011-09-29 16:04:33 +02001169 while ((skb = __skb_dequeue(&frames))) {
1170 struct ieee80211_tx_info *info = IEEE80211_SKB_CB(skb);
1171 struct ieee80211_hdr *hdr = (void *) skb->data;
Johannes Berg40b96402011-09-29 16:04:38 +02001172 u8 *qoshdr = NULL;
1173
1174 num++;
Johannes Bergaf818582009-11-06 11:35:50 +01001175
Johannes Berg47086fc2011-09-29 16:04:33 +02001176 /*
1177 * Tell TX path to send this frame even though the
1178 * STA may still remain is PS mode after this frame
1179 * exchange.
1180 */
Johannes Berg02f2f1a2012-02-27 12:18:30 +01001181 info->flags |= IEEE80211_TX_CTL_NO_PS_BUFFER;
Johannes Bergaf818582009-11-06 11:35:50 +01001182
Johannes Berg47086fc2011-09-29 16:04:33 +02001183 /*
1184 * Use MoreData flag to indicate whether there are
1185 * more buffered frames for this STA
1186 */
Janusz.Dziedzic@tieto.com24b9c372011-11-07 09:47:47 +02001187 if (more_data || !skb_queue_empty(&frames))
Johannes Berg47086fc2011-09-29 16:04:33 +02001188 hdr->frame_control |=
1189 cpu_to_le16(IEEE80211_FCTL_MOREDATA);
Janusz.Dziedzic@tieto.com24b9c372011-11-07 09:47:47 +02001190 else
1191 hdr->frame_control &=
1192 cpu_to_le16(~IEEE80211_FCTL_MOREDATA);
Johannes Berg47086fc2011-09-29 16:04:33 +02001193
Johannes Berg40b96402011-09-29 16:04:38 +02001194 if (ieee80211_is_data_qos(hdr->frame_control) ||
1195 ieee80211_is_qos_nullfunc(hdr->frame_control))
1196 qoshdr = ieee80211_get_qos_ctl(hdr);
1197
1198 /* set EOSP for the frame */
Johannes Berg47086fc2011-09-29 16:04:33 +02001199 if (reason == IEEE80211_FRAME_RELEASE_UAPSD &&
Johannes Berg40b96402011-09-29 16:04:38 +02001200 qoshdr && skb_queue_empty(&frames))
1201 *qoshdr |= IEEE80211_QOS_CTL_EOSP;
Johannes Berg47086fc2011-09-29 16:04:33 +02001202
Johannes Bergdeeaee12011-09-29 16:04:35 +02001203 info->flags |= IEEE80211_TX_STATUS_EOSP |
1204 IEEE80211_TX_CTL_REQ_TX_STATUS;
1205
Johannes Berg40b96402011-09-29 16:04:38 +02001206 if (qoshdr)
1207 tids |= BIT(*qoshdr & IEEE80211_QOS_CTL_TID_MASK);
1208 else
1209 tids |= BIT(0);
1210
Johannes Berg47086fc2011-09-29 16:04:33 +02001211 __skb_queue_tail(&pending, skb);
1212 }
1213
Johannes Berg40b96402011-09-29 16:04:38 +02001214 drv_allow_buffered_frames(local, sta, tids, num,
1215 reason, more_data);
1216
Johannes Berg47086fc2011-09-29 16:04:33 +02001217 ieee80211_add_pending_skbs(local, &pending);
Johannes Bergaf818582009-11-06 11:35:50 +01001218
Johannes Bergc868cb32011-09-29 16:04:27 +02001219 sta_info_recalc_tim(sta);
Johannes Bergaf818582009-11-06 11:35:50 +01001220 } else {
1221 /*
Johannes Berg4049e092011-09-29 16:04:32 +02001222 * We need to release a frame that is buffered somewhere in the
1223 * driver ... it'll have to handle that.
1224 * Note that, as per the comment above, it'll also have to see
1225 * if there is more than just one frame on the specific TID that
1226 * we're releasing from, and it needs to set the more-data bit
1227 * accordingly if we tell it that there's no more data. If we do
1228 * tell it there's more data, then of course the more-data bit
1229 * needs to be set anyway.
Johannes Bergaf818582009-11-06 11:35:50 +01001230 */
Johannes Berg4049e092011-09-29 16:04:32 +02001231 drv_release_buffered_frames(local, sta, driver_release_tids,
Johannes Berg47086fc2011-09-29 16:04:33 +02001232 n_frames, reason, more_data);
Johannes Berg4049e092011-09-29 16:04:32 +02001233
1234 /*
1235 * Note that we don't recalculate the TIM bit here as it would
1236 * most likely have no effect at all unless the driver told us
1237 * that the TID became empty before returning here from the
1238 * release function.
1239 * Either way, however, when the driver tells us that the TID
1240 * became empty we'll do the TIM recalculation.
1241 */
Johannes Bergaf818582009-11-06 11:35:50 +01001242 }
1243}
1244
Johannes Bergaf818582009-11-06 11:35:50 +01001245void ieee80211_sta_ps_deliver_poll_response(struct sta_info *sta)
1246{
Johannes Berg47086fc2011-09-29 16:04:33 +02001247 u8 ignore_for_response = sta->sta.uapsd_queues;
Johannes Bergaf818582009-11-06 11:35:50 +01001248
Johannes Berg47086fc2011-09-29 16:04:33 +02001249 /*
1250 * If all ACs are delivery-enabled then we should reply
1251 * from any of them, if only some are enabled we reply
1252 * only from the non-enabled ones.
1253 */
1254 if (ignore_for_response == BIT(IEEE80211_NUM_ACS) - 1)
1255 ignore_for_response = 0;
1256
1257 ieee80211_sta_ps_deliver_response(sta, 1, ignore_for_response,
1258 IEEE80211_FRAME_RELEASE_PSPOLL);
1259}
1260
1261void ieee80211_sta_ps_deliver_uapsd(struct sta_info *sta)
1262{
1263 int n_frames = sta->sta.max_sp;
1264 u8 delivery_enabled = sta->sta.uapsd_queues;
1265
1266 /*
1267 * If we ever grow support for TSPEC this might happen if
1268 * the TSPEC update from hostapd comes in between a trigger
1269 * frame setting WLAN_STA_UAPSD in the RX path and this
1270 * actually getting called.
1271 */
1272 if (!delivery_enabled)
1273 return;
1274
Johannes Berg47086fc2011-09-29 16:04:33 +02001275 switch (sta->sta.max_sp) {
1276 case 1:
1277 n_frames = 2;
1278 break;
1279 case 2:
1280 n_frames = 4;
1281 break;
1282 case 3:
1283 n_frames = 6;
1284 break;
1285 case 0:
1286 /* XXX: what is a good value? */
1287 n_frames = 8;
1288 break;
Johannes Bergaf818582009-11-06 11:35:50 +01001289 }
Johannes Bergaf818582009-11-06 11:35:50 +01001290
Johannes Berg47086fc2011-09-29 16:04:33 +02001291 ieee80211_sta_ps_deliver_response(sta, n_frames, ~delivery_enabled,
1292 IEEE80211_FRAME_RELEASE_UAPSD);
Johannes Bergaf818582009-11-06 11:35:50 +01001293}
1294
1295void ieee80211_sta_block_awake(struct ieee80211_hw *hw,
1296 struct ieee80211_sta *pubsta, bool block)
1297{
1298 struct sta_info *sta = container_of(pubsta, struct sta_info, sta);
1299
Johannes Bergb5878a22010-04-07 16:48:40 +02001300 trace_api_sta_block_awake(sta->local, pubsta, block);
1301
Johannes Bergaf818582009-11-06 11:35:50 +01001302 if (block)
Johannes Bergc2c98fd2011-09-29 16:04:36 +02001303 set_sta_flag(sta, WLAN_STA_PS_DRIVER);
1304 else if (test_sta_flag(sta, WLAN_STA_PS_DRIVER))
Johannes Bergaf818582009-11-06 11:35:50 +01001305 ieee80211_queue_work(hw, &sta->drv_unblock_wk);
1306}
1307EXPORT_SYMBOL(ieee80211_sta_block_awake);
Felix Fietkaudcf55fb2011-04-17 17:45:00 +02001308
Johannes Berg37fbd902011-09-29 16:04:39 +02001309void ieee80211_sta_eosp_irqsafe(struct ieee80211_sta *pubsta)
1310{
1311 struct sta_info *sta = container_of(pubsta, struct sta_info, sta);
1312 struct ieee80211_local *local = sta->local;
1313 struct sk_buff *skb;
1314 struct skb_eosp_msg_data *data;
1315
1316 trace_api_eosp(local, pubsta);
1317
1318 skb = alloc_skb(0, GFP_ATOMIC);
1319 if (!skb) {
1320 /* too bad ... but race is better than loss */
1321 clear_sta_flag(sta, WLAN_STA_SP);
1322 return;
1323 }
1324
1325 data = (void *)skb->cb;
1326 memcpy(data->sta, pubsta->addr, ETH_ALEN);
1327 memcpy(data->iface, sta->sdata->vif.addr, ETH_ALEN);
1328 skb->pkt_type = IEEE80211_EOSP_MSG;
1329 skb_queue_tail(&local->skb_queue, skb);
1330 tasklet_schedule(&local->tasklet);
1331}
1332EXPORT_SYMBOL(ieee80211_sta_eosp_irqsafe);
1333
Johannes Berg042ec452011-09-29 16:04:26 +02001334void ieee80211_sta_set_buffered(struct ieee80211_sta *pubsta,
1335 u8 tid, bool buffered)
Felix Fietkaudcf55fb2011-04-17 17:45:00 +02001336{
1337 struct sta_info *sta = container_of(pubsta, struct sta_info, sta);
1338
Johannes Berg948d8872011-09-29 16:04:29 +02001339 if (WARN_ON(tid >= STA_TID_NUM))
Johannes Berg042ec452011-09-29 16:04:26 +02001340 return;
1341
Johannes Berg948d8872011-09-29 16:04:29 +02001342 if (buffered)
1343 set_bit(tid, &sta->driver_buffered_tids);
1344 else
1345 clear_bit(tid, &sta->driver_buffered_tids);
1346
Johannes Bergc868cb32011-09-29 16:04:27 +02001347 sta_info_recalc_tim(sta);
Felix Fietkaudcf55fb2011-04-17 17:45:00 +02001348}
Johannes Berg042ec452011-09-29 16:04:26 +02001349EXPORT_SYMBOL(ieee80211_sta_set_buffered);
Johannes Bergd9a7ddb2011-12-14 12:35:30 +01001350
Johannes Berg83d5cc02012-01-12 09:31:10 +01001351int sta_info_move_state(struct sta_info *sta,
1352 enum ieee80211_sta_state new_state)
Johannes Bergd9a7ddb2011-12-14 12:35:30 +01001353{
Johannes Berg8bf11d82011-12-15 11:17:37 +01001354 might_sleep();
Johannes Bergd9a7ddb2011-12-14 12:35:30 +01001355
1356 if (sta->sta_state == new_state)
1357 return 0;
1358
Johannes Bergf09603a2012-01-20 13:55:21 +01001359 /* check allowed transitions first */
1360
Johannes Bergd9a7ddb2011-12-14 12:35:30 +01001361 switch (new_state) {
1362 case IEEE80211_STA_NONE:
Johannes Bergf09603a2012-01-20 13:55:21 +01001363 if (sta->sta_state != IEEE80211_STA_AUTH)
Johannes Bergd9a7ddb2011-12-14 12:35:30 +01001364 return -EINVAL;
1365 break;
1366 case IEEE80211_STA_AUTH:
Johannes Bergf09603a2012-01-20 13:55:21 +01001367 if (sta->sta_state != IEEE80211_STA_NONE &&
1368 sta->sta_state != IEEE80211_STA_ASSOC)
Johannes Bergd9a7ddb2011-12-14 12:35:30 +01001369 return -EINVAL;
1370 break;
1371 case IEEE80211_STA_ASSOC:
Johannes Bergf09603a2012-01-20 13:55:21 +01001372 if (sta->sta_state != IEEE80211_STA_AUTH &&
1373 sta->sta_state != IEEE80211_STA_AUTHORIZED)
Johannes Bergd9a7ddb2011-12-14 12:35:30 +01001374 return -EINVAL;
1375 break;
1376 case IEEE80211_STA_AUTHORIZED:
Johannes Bergf09603a2012-01-20 13:55:21 +01001377 if (sta->sta_state != IEEE80211_STA_ASSOC)
Johannes Bergd9a7ddb2011-12-14 12:35:30 +01001378 return -EINVAL;
1379 break;
1380 default:
1381 WARN(1, "invalid state %d", new_state);
1382 return -EINVAL;
1383 }
1384
Felix Fietkau79027592012-02-07 12:45:44 +01001385#ifdef CONFIG_MAC80211_VERBOSE_DEBUG
Johannes Bergd9a7ddb2011-12-14 12:35:30 +01001386 printk(KERN_DEBUG "%s: moving STA %pM to state %d\n",
1387 sta->sdata->name, sta->sta.addr, new_state);
Felix Fietkau79027592012-02-07 12:45:44 +01001388#endif
Johannes Bergf09603a2012-01-20 13:55:21 +01001389
1390 /*
1391 * notify the driver before the actual changes so it can
1392 * fail the transition
1393 */
1394 if (test_sta_flag(sta, WLAN_STA_INSERTED)) {
1395 int err = drv_sta_state(sta->local, sta->sdata, sta,
1396 sta->sta_state, new_state);
1397 if (err)
1398 return err;
1399 }
1400
1401 /* reflect the change in all state variables */
1402
1403 switch (new_state) {
1404 case IEEE80211_STA_NONE:
1405 if (sta->sta_state == IEEE80211_STA_AUTH)
1406 clear_bit(WLAN_STA_AUTH, &sta->_flags);
1407 break;
1408 case IEEE80211_STA_AUTH:
1409 if (sta->sta_state == IEEE80211_STA_NONE)
1410 set_bit(WLAN_STA_AUTH, &sta->_flags);
1411 else if (sta->sta_state == IEEE80211_STA_ASSOC)
1412 clear_bit(WLAN_STA_ASSOC, &sta->_flags);
1413 break;
1414 case IEEE80211_STA_ASSOC:
1415 if (sta->sta_state == IEEE80211_STA_AUTH) {
1416 set_bit(WLAN_STA_ASSOC, &sta->_flags);
1417 } else if (sta->sta_state == IEEE80211_STA_AUTHORIZED) {
1418 if (sta->sdata->vif.type == NL80211_IFTYPE_AP)
1419 atomic_dec(&sta->sdata->u.ap.num_sta_authorized);
1420 clear_bit(WLAN_STA_AUTHORIZED, &sta->_flags);
1421 }
1422 break;
1423 case IEEE80211_STA_AUTHORIZED:
1424 if (sta->sta_state == IEEE80211_STA_ASSOC) {
1425 if (sta->sdata->vif.type == NL80211_IFTYPE_AP)
1426 atomic_inc(&sta->sdata->u.ap.num_sta_authorized);
1427 set_bit(WLAN_STA_AUTHORIZED, &sta->_flags);
1428 }
1429 break;
1430 default:
1431 break;
1432 }
1433
Johannes Bergd9a7ddb2011-12-14 12:35:30 +01001434 sta->sta_state = new_state;
1435
1436 return 0;
1437}