blob: 06fa75ceb0251e6064d90661bf7b5e61f979b72c [file] [log] [blame]
Jiri Bencf0706e82007-05-05 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 Bencf0706e82007-05-05 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 Bencf0706e82007-05-05 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 Bencf0706e82007-05-05 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 Bencf0706e82007-05-05 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 Bencf0706e82007-05-05 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 Bencf0706e82007-05-05 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 Bencf0706e82007-05-05 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 Bencf0706e82007-05-05 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 Bencf0706e82007-05-05 11:45:53 -070090
Michael Wube8755e2007-07-27 15:43:23 +020091 return -ENOENT;
Jiri Bencf0706e82007-05-05 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 &&
Joe Perchesb203ca32012-05-08 18:56:52 +0000105 ether_addr_equal(sta->sta.addr, addr))
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)) &&
Joe Perchesb203ca32012-05-08 18:56:52 +0000128 ether_addr_equal(sta->sta.addr, addr))
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 Bencf0706e82007-05-05 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 Bergaf65cd962009-11-17 18:18:36 +0100170 rate_control_free_sta(sta);
Johannes Berg93e5deb2008-04-01 15:21:00 +0200171
Johannes Bergbdcbd8e2012-06-22 11:29:50 +0200172 sta_dbg(sta->sdata, "Destroyed STA %pM\n", sta->sta.addr);
Johannes Berg93e5deb2008-04-01 15:21:00 +0200173
174 kfree(sta);
175}
176
Johannes Berg4d339602011-12-15 11:24:20 +0100177/* Caller must hold local->sta_mtx */
Johannes Bergd0709a62008-02-25 16:27:46 +0100178static void sta_info_hash_add(struct ieee80211_local *local,
179 struct sta_info *sta)
Jiri Bencf0706e82007-05-05 11:45:53 -0700180{
Johannes Berg4d339602011-12-15 11:24:20 +0100181 lockdep_assert_held(&local->sta_mtx);
Johannes Berg17741cd2008-09-11 00:02:02 +0200182 sta->hnext = local->sta_hash[STA_HASH(sta->sta.addr)];
Eric Dumazetcf778b02012-01-12 04:41:32 +0000183 rcu_assign_pointer(local->sta_hash[STA_HASH(sta->sta.addr)], sta);
Jiri Bencf0706e82007-05-05 11:45:53 -0700184}
Jiri Bencf0706e82007-05-05 11:45:53 -0700185
Johannes Bergaf818582009-11-06 11:35:50 +0100186static void sta_unblock(struct work_struct *wk)
187{
188 struct sta_info *sta;
189
190 sta = container_of(wk, struct sta_info, drv_unblock_wk);
191
192 if (sta->dead)
193 return;
194
Helmut Schaa54420472012-01-17 09:22:49 +0100195 if (!test_sta_flag(sta, WLAN_STA_PS_STA)) {
196 local_bh_disable();
Johannes Bergaf818582009-11-06 11:35:50 +0100197 ieee80211_sta_ps_deliver_wakeup(sta);
Helmut Schaa54420472012-01-17 09:22:49 +0100198 local_bh_enable();
199 } else if (test_and_clear_sta_flag(sta, WLAN_STA_PSPOLL)) {
Johannes Bergc2c98fd2011-09-29 16:04:36 +0200200 clear_sta_flag(sta, WLAN_STA_PS_DRIVER);
Johannes Bergce662b442011-09-29 16:04:34 +0200201
202 local_bh_disable();
Johannes Bergaf818582009-11-06 11:35:50 +0100203 ieee80211_sta_ps_deliver_poll_response(sta);
Johannes Bergce662b442011-09-29 16:04:34 +0200204 local_bh_enable();
Johannes Bergc2c98fd2011-09-29 16:04:36 +0200205 } else if (test_and_clear_sta_flag(sta, WLAN_STA_UAPSD)) {
206 clear_sta_flag(sta, WLAN_STA_PS_DRIVER);
Johannes Bergce662b442011-09-29 16:04:34 +0200207
208 local_bh_disable();
Johannes Berg47086fc2011-09-29 16:04:33 +0200209 ieee80211_sta_ps_deliver_uapsd(sta);
Johannes Bergce662b442011-09-29 16:04:34 +0200210 local_bh_enable();
Johannes Berg50a94322010-11-16 11:50:28 -0800211 } else
Johannes Bergc2c98fd2011-09-29 16:04:36 +0200212 clear_sta_flag(sta, WLAN_STA_PS_DRIVER);
Johannes Bergaf818582009-11-06 11:35:50 +0100213}
214
Johannes Bergaf65cd962009-11-17 18:18:36 +0100215static int sta_prepare_rate_control(struct ieee80211_local *local,
216 struct sta_info *sta, gfp_t gfp)
217{
218 if (local->hw.flags & IEEE80211_HW_HAS_RATE_CONTROL)
219 return 0;
220
Johannes Berg889cbb92012-01-17 10:33:29 +0100221 sta->rate_ctrl = local->rate_ctrl;
Johannes Bergaf65cd962009-11-17 18:18:36 +0100222 sta->rate_ctrl_priv = rate_control_alloc_sta(sta->rate_ctrl,
223 &sta->sta, gfp);
Johannes Berg889cbb92012-01-17 10:33:29 +0100224 if (!sta->rate_ctrl_priv)
Johannes Bergaf65cd962009-11-17 18:18:36 +0100225 return -ENOMEM;
Johannes Bergaf65cd962009-11-17 18:18:36 +0100226
227 return 0;
228}
229
Johannes Berg73651ee2008-02-25 16:27:47 +0100230struct sta_info *sta_info_alloc(struct ieee80211_sub_if_data *sdata,
Johannes Berg56544162011-12-14 13:28:46 +0100231 const u8 *addr, gfp_t gfp)
Jiri Bencf0706e82007-05-05 11:45:53 -0700232{
Johannes Bergd0709a62008-02-25 16:27:46 +0100233 struct ieee80211_local *local = sdata->local;
Jiri Bencf0706e82007-05-05 11:45:53 -0700234 struct sta_info *sta;
Mohammed Shafi Shajakhanebe27c92011-04-08 21:24:24 +0530235 struct timespec uptime;
Ron Rindjunsky16c5f152007-12-25 17:00:34 +0200236 int i;
Jiri Bencf0706e82007-05-05 11:45:53 -0700237
Johannes Berg17741cd2008-09-11 00:02:02 +0200238 sta = kzalloc(sizeof(*sta) + local->hw.sta_data_size, gfp);
Jiri Bencf0706e82007-05-05 11:45:53 -0700239 if (!sta)
Johannes Berg73651ee2008-02-25 16:27:47 +0100240 return NULL;
Jiri Bencf0706e82007-05-05 11:45:53 -0700241
Johannes Berg07346f812008-05-03 01:02:02 +0200242 spin_lock_init(&sta->lock);
Johannes Bergaf818582009-11-06 11:35:50 +0100243 INIT_WORK(&sta->drv_unblock_wk, sta_unblock);
Johannes Berg67c282c2010-06-10 10:21:43 +0200244 INIT_WORK(&sta->ampdu_mlme.work, ieee80211_ba_session_work);
Johannes Berga93e3642010-06-10 10:21:46 +0200245 mutex_init(&sta->ampdu_mlme.mtx);
Johannes Berg07346f812008-05-03 01:02:02 +0200246
Johannes Berg17741cd2008-09-11 00:02:02 +0200247 memcpy(sta->sta.addr, addr, ETH_ALEN);
Johannes Bergd0709a62008-02-25 16:27:46 +0100248 sta->local = local;
249 sta->sdata = sdata;
Felix Fietkau8bc8aec2011-03-21 20:01:00 +0100250 sta->last_rx = jiffies;
Jiri Bencf0706e82007-05-05 11:45:53 -0700251
Johannes Berg71ec3752012-01-20 13:55:20 +0100252 sta->sta_state = IEEE80211_STA_NONE;
253
Mohammed Shafi Shajakhanebe27c92011-04-08 21:24:24 +0530254 do_posix_clock_monotonic_gettime(&uptime);
255 sta->last_connected = uptime.tv_sec;
Bruno Randolf541a45a2010-12-02 19:12:43 +0900256 ewma_init(&sta->avg_signal, 1024, 8);
257
Johannes Bergaf65cd962009-11-17 18:18:36 +0100258 if (sta_prepare_rate_control(local, sta, gfp)) {
Jiri Bencf0706e82007-05-05 11:45:53 -0700259 kfree(sta);
Johannes Berg73651ee2008-02-25 16:27:47 +0100260 return NULL;
Jiri Bencf0706e82007-05-05 11:45:53 -0700261 }
262
Ron Rindjunsky16c5f152007-12-25 17:00:34 +0200263 for (i = 0; i < STA_TID_NUM; i++) {
Johannes Berga622ab72010-06-10 10:21:39 +0200264 /*
265 * timer_to_tid must be initialized with identity mapping
266 * to enable session_timer's data differentiation. See
267 * sta_rx_agg_session_timer_expired for usage.
268 */
Ron Rindjunsky16c5f152007-12-25 17:00:34 +0200269 sta->timer_to_tid[i] = i;
Ron Rindjunsky16c5f152007-12-25 17:00:34 +0200270 }
Johannes Berg948d8872011-09-29 16:04:29 +0200271 for (i = 0; i < IEEE80211_NUM_ACS; i++) {
272 skb_queue_head_init(&sta->ps_tx_buf[i]);
273 skb_queue_head_init(&sta->tx_filtered[i]);
274 }
Johannes Berg73651ee2008-02-25 16:27:47 +0100275
Senthil Balasubramaniancccaec92009-05-14 18:42:08 +0530276 for (i = 0; i < NUM_RX_DATA_QUEUES; i++)
Alexey Dobriyan4be929b2010-05-24 14:33:03 -0700277 sta->last_seq_ctrl[i] = cpu_to_le16(USHRT_MAX);
Senthil Balasubramaniancccaec92009-05-14 18:42:08 +0530278
Johannes Bergbdcbd8e2012-06-22 11:29:50 +0200279 sta_dbg(sdata, "Allocated STA %pM\n", sta->sta.addr);
Johannes Berg73651ee2008-02-25 16:27:47 +0100280
Johannes Berg03e44972008-02-27 09:56:40 +0100281#ifdef CONFIG_MAC80211_MESH
Javier Cardona57cf8042011-05-13 10:45:43 -0700282 sta->plink_state = NL80211_PLINK_LISTEN;
Johannes Berg03e44972008-02-27 09:56:40 +0100283 init_timer(&sta->plink_timer);
284#endif
285
Johannes Berg73651ee2008-02-25 16:27:47 +0100286 return sta;
287}
288
Guy Eilam8c71df72011-08-17 15:18:14 +0300289static int sta_info_insert_check(struct sta_info *sta)
Johannes Berg34e89502010-02-03 13:59:58 +0100290{
Johannes Berg34e89502010-02-03 13:59:58 +0100291 struct ieee80211_sub_if_data *sdata = sta->sdata;
Johannes Berg34e89502010-02-03 13:59:58 +0100292
Johannes Berg03e44972008-02-27 09:56:40 +0100293 /*
294 * Can't be a WARN_ON because it can be triggered through a race:
295 * something inserts a STA (on one CPU) without holding the RTNL
296 * and another CPU turns off the net device.
297 */
Guy Eilam8c71df72011-08-17 15:18:14 +0300298 if (unlikely(!ieee80211_sdata_running(sdata)))
299 return -ENETDOWN;
Johannes Berg03e44972008-02-27 09:56:40 +0100300
Joe Perchesb203ca32012-05-08 18:56:52 +0000301 if (WARN_ON(ether_addr_equal(sta->sta.addr, sdata->vif.addr) ||
Guy Eilam8c71df72011-08-17 15:18:14 +0300302 is_multicast_ether_addr(sta->sta.addr)))
303 return -EINVAL;
304
305 return 0;
306}
307
Johannes Bergf09603a2012-01-20 13:55:21 +0100308static int sta_info_insert_drv_state(struct ieee80211_local *local,
309 struct ieee80211_sub_if_data *sdata,
310 struct sta_info *sta)
311{
312 enum ieee80211_sta_state state;
313 int err = 0;
314
315 for (state = IEEE80211_STA_NOTEXIST; state < sta->sta_state; state++) {
316 err = drv_sta_state(local, sdata, sta, state, state + 1);
317 if (err)
318 break;
319 }
320
321 if (!err) {
Johannes Berga4ec45a2012-01-20 13:55:22 +0100322 /*
323 * Drivers using legacy sta_add/sta_remove callbacks only
324 * get uploaded set to true after sta_add is called.
325 */
326 if (!local->ops->sta_add)
327 sta->uploaded = true;
Johannes Bergf09603a2012-01-20 13:55:21 +0100328 return 0;
329 }
330
331 if (sdata->vif.type == NL80211_IFTYPE_ADHOC) {
Johannes Bergbdcbd8e2012-06-22 11:29:50 +0200332 sdata_info(sdata,
333 "failed to move IBSS STA %pM to state %d (%d) - keeping it anyway\n",
334 sta->sta.addr, state + 1, err);
Johannes Bergf09603a2012-01-20 13:55:21 +0100335 err = 0;
336 }
337
338 /* unwind on error */
339 for (; state > IEEE80211_STA_NOTEXIST; state--)
340 WARN_ON(drv_sta_state(local, sdata, sta, state, state - 1));
341
342 return err;
343}
344
Guy Eilam8c71df72011-08-17 15:18:14 +0300345/*
346 * should be called with sta_mtx locked
347 * this function replaces the mutex lock
348 * with a RCU lock
349 */
Johannes Berg4d339602011-12-15 11:24:20 +0100350static int sta_info_insert_finish(struct sta_info *sta) __acquires(RCU)
Guy Eilam8c71df72011-08-17 15:18:14 +0300351{
352 struct ieee80211_local *local = sta->local;
353 struct ieee80211_sub_if_data *sdata = sta->sdata;
Johannes Berg7852e362012-01-20 13:55:24 +0100354 struct station_info sinfo;
Guy Eilam8c71df72011-08-17 15:18:14 +0300355 int err = 0;
356
357 lockdep_assert_held(&local->sta_mtx);
Johannes Berg34e89502010-02-03 13:59:58 +0100358
Johannes Berg7852e362012-01-20 13:55:24 +0100359 /* check if STA exists already */
360 if (sta_info_get_bss(sdata, sta->sta.addr)) {
361 err = -EEXIST;
362 goto out_err;
Johannes Berg43ba7e92008-02-21 14:09:30 +0100363 }
Johannes Berg32bfd352007-12-19 01:31:26 +0100364
Johannes Berg7852e362012-01-20 13:55:24 +0100365 /* notify driver */
366 err = sta_info_insert_drv_state(local, sdata, sta);
367 if (err)
368 goto out_err;
Johannes Berg32bfd352007-12-19 01:31:26 +0100369
Johannes Berg7852e362012-01-20 13:55:24 +0100370 local->num_sta++;
371 local->sta_generation++;
372 smp_mb();
Johannes Berg4d339602011-12-15 11:24:20 +0100373
Johannes Berg7852e362012-01-20 13:55:24 +0100374 /* make the station visible */
375 sta_info_hash_add(local, sta);
Johannes Berg4d339602011-12-15 11:24:20 +0100376
Arik Nemtsov794454c2012-06-03 23:32:32 +0300377 list_add_rcu(&sta->list, &local->sta_list);
Johannes Berg83d5cc02012-01-12 09:31:10 +0100378
Johannes Berg7852e362012-01-20 13:55:24 +0100379 set_sta_flag(sta, WLAN_STA_INSERTED);
Johannes Berg4d339602011-12-15 11:24:20 +0100380
Johannes Berg7852e362012-01-20 13:55:24 +0100381 ieee80211_sta_debugfs_add(sta);
382 rate_control_add_sta_debugfs(sta);
Johannes Berg4d339602011-12-15 11:24:20 +0100383
Johannes Berg7852e362012-01-20 13:55:24 +0100384 memset(&sinfo, 0, sizeof(sinfo));
385 sinfo.filled = 0;
386 sinfo.generation = local->sta_generation;
387 cfg80211_new_sta(sdata->dev, sta->sta.addr, &sinfo, GFP_KERNEL);
Johannes Bergd0709a62008-02-25 16:27:46 +0100388
Johannes Bergbdcbd8e2012-06-22 11:29:50 +0200389 sta_dbg(sdata, "Inserted STA %pM\n", sta->sta.addr);
Jiri Bencf0706e82007-05-05 11:45:53 -0700390
Johannes Berg34e89502010-02-03 13:59:58 +0100391 /* move reference to rcu-protected */
392 rcu_read_lock();
393 mutex_unlock(&local->sta_mtx);
Jiri Bence9f207f2007-05-05 11:46:38 -0700394
Johannes Berg73651ee2008-02-25 16:27:47 +0100395 if (ieee80211_vif_is_mesh(&sdata->vif))
396 mesh_accept_plinks_update(sdata);
397
398 return 0;
Johannes Berg4d339602011-12-15 11:24:20 +0100399 out_err:
400 mutex_unlock(&local->sta_mtx);
401 rcu_read_lock();
402 return err;
Guy Eilam8c71df72011-08-17 15:18:14 +0300403}
404
405int sta_info_insert_rcu(struct sta_info *sta) __acquires(RCU)
406{
407 struct ieee80211_local *local = sta->local;
Guy Eilam8c71df72011-08-17 15:18:14 +0300408 int err = 0;
409
Johannes Berg4d339602011-12-15 11:24:20 +0100410 might_sleep();
411
Guy Eilam8c71df72011-08-17 15:18:14 +0300412 err = sta_info_insert_check(sta);
413 if (err) {
Jiri Bencf0706e82007-05-05 11:45:53 -0700414 rcu_read_lock();
415 goto out_free;
416 }
417
Johannes Berg004c8722008-02-20 11:21:35 +0100418 mutex_lock(&local->sta_mtx);
419
Johannes Berg4d339602011-12-15 11:24:20 +0100420 err = sta_info_insert_finish(sta);
Guy Eilam8c71df72011-08-17 15:18:14 +0300421 if (err)
Johannes Berg004c8722008-02-20 11:21:35 +0100422 goto out_free;
Johannes Bergd0709a62008-02-25 16:27:46 +0100423
Johannes Berg004c8722008-02-20 11:21:35 +0100424 return 0;
Johannes Berg93e5deb2008-04-01 15:21:00 +0200425 out_free:
426 BUG_ON(!err);
Johannes Bergd9a7ddb2011-12-14 12:35:30 +0100427 sta_info_free(local, sta);
Johannes Berg93e5deb2008-04-01 15:21:00 +0200428 return err;
Jiri Bencf0706e82007-05-05 11:45:53 -0700429}
430
Johannes Berg34e89502010-02-03 13:59:58 +0100431int sta_info_insert(struct sta_info *sta)
432{
433 int err = sta_info_insert_rcu(sta);
434
435 rcu_read_unlock();
436
437 return err;
438}
439
Jiri Bencf0706e82007-05-05 11:45:53 -0700440static inline void __bss_tim_set(struct ieee80211_if_ap *bss, u16 aid)
Johannes Berg004c8722008-02-20 11:21:35 +0100441{
442 /*
443 * This format has been mandated by the IEEE specifications,
444 * so this line may not be changed to use the __set_bit() format.
445 */
446 bss->tim[aid / 8] |= (1 << (aid % 8));
447}
448
449static inline void __bss_tim_clear(struct ieee80211_if_ap *bss, u16 aid)
450{
451 /*
452 * This format has been mandated by the IEEE specifications,
453 * so this line may not be changed to use the __clear_bit() format.
454 */
455 bss->tim[aid / 8] &= ~(1 << (aid % 8));
456}
457
Johannes Berg948d8872011-09-29 16:04:29 +0200458static unsigned long ieee80211_tids_for_ac(int ac)
Johannes Berg004c8722008-02-20 11:21:35 +0100459{
Johannes Berg948d8872011-09-29 16:04:29 +0200460 /* If we ever support TIDs > 7, this obviously needs to be adjusted */
461 switch (ac) {
462 case IEEE80211_AC_VO:
463 return BIT(6) | BIT(7);
464 case IEEE80211_AC_VI:
465 return BIT(4) | BIT(5);
466 case IEEE80211_AC_BE:
467 return BIT(0) | BIT(3);
468 case IEEE80211_AC_BK:
469 return BIT(1) | BIT(2);
470 default:
471 WARN_ON(1);
472 return 0;
Johannes Bergd0709a62008-02-25 16:27:46 +0100473 }
Johannes Berg004c8722008-02-20 11:21:35 +0100474}
475
Johannes Bergc868cb352011-09-29 16:04:27 +0200476void sta_info_recalc_tim(struct sta_info *sta)
Johannes Berg004c8722008-02-20 11:21:35 +0100477{
Johannes Bergc868cb352011-09-29 16:04:27 +0200478 struct ieee80211_local *local = sta->local;
479 struct ieee80211_if_ap *bss = sta->sdata->bss;
Johannes Bergd0709a62008-02-25 16:27:46 +0100480 unsigned long flags;
Johannes Berg948d8872011-09-29 16:04:29 +0200481 bool indicate_tim = false;
482 u8 ignore_for_tim = sta->sta.uapsd_queues;
483 int ac;
Johannes Berg004c8722008-02-20 11:21:35 +0100484
Johannes Bergc868cb352011-09-29 16:04:27 +0200485 if (WARN_ON_ONCE(!sta->sdata->bss))
486 return;
Johannes Berg3e122be2008-07-09 14:40:34 +0200487
Johannes Bergc868cb352011-09-29 16:04:27 +0200488 /* No need to do anything if the driver does all */
489 if (local->hw.flags & IEEE80211_HW_AP_LINK_PS)
490 return;
Johannes Berg004c8722008-02-20 11:21:35 +0100491
Johannes Bergc868cb352011-09-29 16:04:27 +0200492 if (sta->dead)
493 goto done;
Johannes Berg3e122be2008-07-09 14:40:34 +0200494
Johannes Berg948d8872011-09-29 16:04:29 +0200495 /*
496 * If all ACs are delivery-enabled then we should build
497 * the TIM bit for all ACs anyway; if only some are then
498 * we ignore those and build the TIM bit using only the
499 * non-enabled ones.
500 */
501 if (ignore_for_tim == BIT(IEEE80211_NUM_ACS) - 1)
502 ignore_for_tim = 0;
Johannes Berg3e122be2008-07-09 14:40:34 +0200503
Johannes Berg948d8872011-09-29 16:04:29 +0200504 for (ac = 0; ac < IEEE80211_NUM_ACS; ac++) {
505 unsigned long tids;
506
507 if (ignore_for_tim & BIT(ac))
508 continue;
509
510 indicate_tim |= !skb_queue_empty(&sta->tx_filtered[ac]) ||
511 !skb_queue_empty(&sta->ps_tx_buf[ac]);
512 if (indicate_tim)
513 break;
514
515 tids = ieee80211_tids_for_ac(ac);
516
517 indicate_tim |=
518 sta->driver_buffered_tids & tids;
Johannes Bergd0709a62008-02-25 16:27:46 +0100519 }
Johannes Berg004c8722008-02-20 11:21:35 +0100520
Johannes Bergc868cb352011-09-29 16:04:27 +0200521 done:
Johannes Berg4d339602011-12-15 11:24:20 +0100522 spin_lock_irqsave(&local->tim_lock, flags);
Johannes Berg004c8722008-02-20 11:21:35 +0100523
Johannes Berg948d8872011-09-29 16:04:29 +0200524 if (indicate_tim)
Johannes Bergc868cb352011-09-29 16:04:27 +0200525 __bss_tim_set(bss, sta->sta.aid);
526 else
527 __bss_tim_clear(bss, sta->sta.aid);
Johannes Berg3e122be2008-07-09 14:40:34 +0200528
Johannes Bergc868cb352011-09-29 16:04:27 +0200529 if (local->ops->set_tim) {
530 local->tim_in_locked_section = true;
Johannes Berg948d8872011-09-29 16:04:29 +0200531 drv_set_tim(local, &sta->sta, indicate_tim);
Johannes Bergc868cb352011-09-29 16:04:27 +0200532 local->tim_in_locked_section = false;
Johannes Berg004c8722008-02-20 11:21:35 +0100533 }
Johannes Berg004c8722008-02-20 11:21:35 +0100534
Johannes Berg4d339602011-12-15 11:24:20 +0100535 spin_unlock_irqrestore(&local->tim_lock, flags);
Johannes Berg004c8722008-02-20 11:21:35 +0100536}
537
Johannes Bergcd0b8d82011-09-06 14:13:06 +0200538static bool sta_info_buffer_expired(struct sta_info *sta, struct sk_buff *skb)
Jiri Bencf0706e82007-05-05 11:45:53 -0700539{
Johannes Berge039fa42008-05-15 12:55:29 +0200540 struct ieee80211_tx_info *info;
Jiri Bencf0706e82007-05-05 11:45:53 -0700541 int timeout;
542
543 if (!skb)
Johannes Bergcd0b8d82011-09-06 14:13:06 +0200544 return false;
Jiri Bencf0706e82007-05-05 11:45:53 -0700545
Johannes Berge039fa42008-05-15 12:55:29 +0200546 info = IEEE80211_SKB_CB(skb);
Jiri Bencf0706e82007-05-05 11:45:53 -0700547
548 /* Timeout: (2 * listen_interval * beacon_int * 1024 / 1000000) sec */
Johannes Berg57c4d7b2009-04-23 16:10:04 +0200549 timeout = (sta->listen_interval *
550 sta->sdata->vif.bss_conf.beacon_int *
551 32 / 15625) * HZ;
Jiri Bencf0706e82007-05-05 11:45:53 -0700552 if (timeout < STA_TX_BUFFER_EXPIRE)
553 timeout = STA_TX_BUFFER_EXPIRE;
Johannes Berge039fa42008-05-15 12:55:29 +0200554 return time_after(jiffies, info->control.jiffies + timeout);
Jiri Bencf0706e82007-05-05 11:45:53 -0700555}
556
557
Johannes Berg948d8872011-09-29 16:04:29 +0200558static bool sta_info_cleanup_expire_buffered_ac(struct ieee80211_local *local,
559 struct sta_info *sta, int ac)
Jiri Bencf0706e82007-05-05 11:45:53 -0700560{
561 unsigned long flags;
562 struct sk_buff *skb;
563
Johannes Berg60750392011-09-29 16:04:28 +0200564 /*
565 * First check for frames that should expire on the filtered
566 * queue. Frames here were rejected by the driver and are on
567 * a separate queue to avoid reordering with normal PS-buffered
568 * frames. They also aren't accounted for right now in the
569 * total_ps_buffered counter.
570 */
Jiri Bencf0706e82007-05-05 11:45:53 -0700571 for (;;) {
Johannes Berg948d8872011-09-29 16:04:29 +0200572 spin_lock_irqsave(&sta->tx_filtered[ac].lock, flags);
573 skb = skb_peek(&sta->tx_filtered[ac]);
Johannes Berg57c4d7b2009-04-23 16:10:04 +0200574 if (sta_info_buffer_expired(sta, skb))
Johannes Berg948d8872011-09-29 16:04:29 +0200575 skb = __skb_dequeue(&sta->tx_filtered[ac]);
Johannes Berg836341a2008-02-20 02:07:21 +0100576 else
Jiri Bencf0706e82007-05-05 11:45:53 -0700577 skb = NULL;
Johannes Berg948d8872011-09-29 16:04:29 +0200578 spin_unlock_irqrestore(&sta->tx_filtered[ac].lock, flags);
Jiri Bencf0706e82007-05-05 11:45:53 -0700579
Johannes Berg60750392011-09-29 16:04:28 +0200580 /*
581 * Frames are queued in order, so if this one
582 * hasn't expired yet we can stop testing. If
583 * we actually reached the end of the queue we
584 * also need to stop, of course.
585 */
586 if (!skb)
587 break;
588 dev_kfree_skb(skb);
589 }
590
591 /*
592 * Now also check the normal PS-buffered queue, this will
593 * only find something if the filtered queue was emptied
594 * since the filtered frames are all before the normal PS
595 * buffered frames.
596 */
Jiri Bencf0706e82007-05-05 11:45:53 -0700597 for (;;) {
Johannes Berg948d8872011-09-29 16:04:29 +0200598 spin_lock_irqsave(&sta->ps_tx_buf[ac].lock, flags);
599 skb = skb_peek(&sta->ps_tx_buf[ac]);
Jiri Bencf0706e82007-05-05 11:45:53 -0700600 if (sta_info_buffer_expired(sta, skb))
Johannes Berg948d8872011-09-29 16:04:29 +0200601 skb = __skb_dequeue(&sta->ps_tx_buf[ac]);
Jiri Bencf0706e82007-05-05 11:45:53 -0700602 else
603 skb = NULL;
Johannes Berg948d8872011-09-29 16:04:29 +0200604 spin_unlock_irqrestore(&sta->ps_tx_buf[ac].lock, flags);
Jiri Bencf0706e82007-05-05 11:45:53 -0700605
Johannes Berg60750392011-09-29 16:04:28 +0200606 /*
607 * frames are queued in order, so if this one
608 * hasn't expired yet (or we reached the end of
609 * the queue) we can stop testing
610 */
Johannes Berg836341a2008-02-20 02:07:21 +0100611 if (!skb)
Jiri Bencf0706e82007-05-05 11:45:53 -0700612 break;
Johannes Berg836341a2008-02-20 02:07:21 +0100613
Johannes Berg836341a2008-02-20 02:07:21 +0100614 local->total_ps_buffered--;
Johannes Bergbdcbd8e2012-06-22 11:29:50 +0200615 ps_dbg(sta->sdata, "Buffered frame expired (STA %pM)\n",
616 sta->sta.addr);
Johannes Berg836341a2008-02-20 02:07:21 +0100617 dev_kfree_skb(skb);
Jiri Bencf0706e82007-05-05 11:45:53 -0700618 }
Juuso Oikarinen3393a602010-04-19 10:12:52 +0300619
Johannes Berg60750392011-09-29 16:04:28 +0200620 /*
621 * Finally, recalculate the TIM bit for this station -- it might
622 * now be clear because the station was too slow to retrieve its
623 * frames.
624 */
625 sta_info_recalc_tim(sta);
626
627 /*
628 * Return whether there are any frames still buffered, this is
629 * used to check whether the cleanup timer still needs to run,
630 * if there are no frames we don't need to rearm the timer.
631 */
Johannes Berg948d8872011-09-29 16:04:29 +0200632 return !(skb_queue_empty(&sta->ps_tx_buf[ac]) &&
633 skb_queue_empty(&sta->tx_filtered[ac]));
634}
635
636static bool sta_info_cleanup_expire_buffered(struct ieee80211_local *local,
637 struct sta_info *sta)
638{
639 bool have_buffered = false;
640 int ac;
641
642 /* This is only necessary for stations on BSS interfaces */
643 if (!sta->sdata->bss)
644 return false;
645
646 for (ac = 0; ac < IEEE80211_NUM_ACS; ac++)
647 have_buffered |=
648 sta_info_cleanup_expire_buffered_ac(local, sta, ac);
649
650 return have_buffered;
Jiri Bencf0706e82007-05-05 11:45:53 -0700651}
652
Johannes Berg83d5cc02012-01-12 09:31:10 +0100653int __must_check __sta_info_destroy(struct sta_info *sta)
Johannes Berg34e89502010-02-03 13:59:58 +0100654{
655 struct ieee80211_local *local;
656 struct ieee80211_sub_if_data *sdata;
Johannes Berg948d8872011-09-29 16:04:29 +0200657 int ret, i, ac;
Yogesh Ashok Powar42624d42011-12-08 14:56:15 +0530658 struct tid_ampdu_tx *tid_tx;
Johannes Berg34e89502010-02-03 13:59:58 +0100659
660 might_sleep();
661
662 if (!sta)
663 return -ENOENT;
664
665 local = sta->local;
666 sdata = sta->sdata;
667
Johannes Berg83d5cc02012-01-12 09:31:10 +0100668 lockdep_assert_held(&local->sta_mtx);
669
Johannes Berg098a6072010-04-06 11:18:47 +0200670 /*
671 * Before removing the station from the driver and
672 * rate control, it might still start new aggregation
673 * sessions -- block that to make sure the tear-down
674 * will be sufficient.
675 */
Johannes Bergc2c98fd2011-09-29 16:04:36 +0200676 set_sta_flag(sta, WLAN_STA_BLOCK_BA);
Johannes Berg53f73c02010-10-05 19:37:40 +0200677 ieee80211_sta_tear_down_BA_sessions(sta, true);
Johannes Berg098a6072010-04-06 11:18:47 +0200678
Johannes Berg34e89502010-02-03 13:59:58 +0100679 ret = sta_info_hash_del(local, sta);
Johannes Berg34e89502010-02-03 13:59:58 +0100680 if (ret)
681 return ret;
682
Arik Nemtsov794454c2012-06-03 23:32:32 +0300683 list_del_rcu(&sta->list);
Johannes Berg4d339602011-12-15 11:24:20 +0100684
Johannes Berg8cb23152011-05-12 15:07:15 +0200685 mutex_lock(&local->key_mtx);
Johannes Berge31b8212010-10-05 19:39:30 +0200686 for (i = 0; i < NUM_DEFAULT_KEYS; i++)
Johannes Berg40b275b2011-05-13 14:15:49 +0200687 __ieee80211_key_free(key_mtx_dereference(local, sta->gtk[i]));
Johannes Berge31b8212010-10-05 19:39:30 +0200688 if (sta->ptk)
Johannes Berg40b275b2011-05-13 14:15:49 +0200689 __ieee80211_key_free(key_mtx_dereference(local, sta->ptk));
Johannes Berg8cb23152011-05-12 15:07:15 +0200690 mutex_unlock(&local->key_mtx);
Johannes Berg34e89502010-02-03 13:59:58 +0100691
692 sta->dead = true;
693
Johannes Berg34e89502010-02-03 13:59:58 +0100694 local->num_sta--;
695 local->sta_generation++;
696
697 if (sdata->vif.type == NL80211_IFTYPE_AP_VLAN)
Stephen Hemmingera9b3cd72011-08-01 16:19:00 +0000698 RCU_INIT_POINTER(sdata->u.vlan.sta, NULL);
Johannes Berg34e89502010-02-03 13:59:58 +0100699
Johannes Berg83d5cc02012-01-12 09:31:10 +0100700 while (sta->sta_state > IEEE80211_STA_NONE) {
Johannes Bergf09603a2012-01-20 13:55:21 +0100701 ret = sta_info_move_state(sta, sta->sta_state - 1);
702 if (ret) {
Johannes Berg83d5cc02012-01-12 09:31:10 +0100703 WARN_ON_ONCE(1);
704 break;
705 }
706 }
Johannes Bergd9a7ddb2011-12-14 12:35:30 +0100707
Johannes Bergf09603a2012-01-20 13:55:21 +0100708 if (sta->uploaded) {
Johannes Bergf09603a2012-01-20 13:55:21 +0100709 ret = drv_sta_state(local, sdata, sta, IEEE80211_STA_NONE,
710 IEEE80211_STA_NOTEXIST);
711 WARN_ON_ONCE(ret != 0);
712 }
Johannes Berg34e89502010-02-03 13:59:58 +0100713
Johannes Berge64b3792010-04-06 11:18:43 +0200714 /*
715 * At this point, after we wait for an RCU grace period,
716 * neither mac80211 nor the driver can reference this
717 * sta struct any more except by still existing timers
718 * associated with this station that we clean up below.
719 */
720 synchronize_rcu();
721
Helmut Schaa4f3eb0b2012-01-27 11:02:53 +0100722 if (test_sta_flag(sta, WLAN_STA_PS_STA)) {
723 BUG_ON(!sdata->bss);
724
725 clear_sta_flag(sta, WLAN_STA_PS_STA);
726
727 atomic_dec(&sdata->bss->num_sta_ps);
728 sta_info_recalc_tim(sta);
729 }
730
Johannes Berg948d8872011-09-29 16:04:29 +0200731 for (ac = 0; ac < IEEE80211_NUM_ACS; ac++) {
732 local->total_ps_buffered -= skb_queue_len(&sta->ps_tx_buf[ac]);
733 __skb_queue_purge(&sta->ps_tx_buf[ac]);
734 __skb_queue_purge(&sta->tx_filtered[ac]);
735 }
Johannes Bergc868cb352011-09-29 16:04:27 +0200736
Johannes Berg34e89502010-02-03 13:59:58 +0100737#ifdef CONFIG_MAC80211_MESH
Johannes Berge64b3792010-04-06 11:18:43 +0200738 if (ieee80211_vif_is_mesh(&sdata->vif))
Johannes Berg34e89502010-02-03 13:59:58 +0100739 mesh_accept_plinks_update(sdata);
Johannes Berg34e89502010-02-03 13:59:58 +0100740#endif
741
Johannes Bergbdcbd8e2012-06-22 11:29:50 +0200742 sta_dbg(sdata, "Removed STA %pM\n", sta->sta.addr);
743
Johannes Berg34e89502010-02-03 13:59:58 +0100744 cancel_work_sync(&sta->drv_unblock_wk);
745
Jouni Malinenec15e682011-03-23 15:29:52 +0200746 cfg80211_del_sta(sdata->dev, sta->sta.addr, GFP_KERNEL);
747
Johannes Berg34e89502010-02-03 13:59:58 +0100748 rate_control_remove_sta_debugfs(sta);
749 ieee80211_sta_debugfs_remove(sta);
750
751#ifdef CONFIG_MAC80211_MESH
752 if (ieee80211_vif_is_mesh(&sta->sdata->vif)) {
753 mesh_plink_deactivate(sta);
754 del_timer_sync(&sta->plink_timer);
755 }
756#endif
757
Johannes Berg151a02f2012-01-17 10:30:01 +0100758 /*
759 * Destroy aggregation state here. It would be nice to wait for the
760 * driver to finish aggregation stop and then clean up, but for now
761 * drivers have to handle aggregation stop being requested, followed
762 * directly by station destruction.
Yogesh Ashok Powar42624d42011-12-08 14:56:15 +0530763 */
764 for (i = 0; i < STA_TID_NUM; i++) {
Johannes Berg151a02f2012-01-17 10:30:01 +0100765 tid_tx = rcu_dereference_raw(sta->ampdu_mlme.tid_tx[i]);
Yogesh Ashok Powar27bf8882011-12-16 11:47:15 +0530766 if (!tid_tx)
Yogesh Ashok Powar42624d42011-12-08 14:56:15 +0530767 continue;
Johannes Berg151a02f2012-01-17 10:30:01 +0100768 __skb_queue_purge(&tid_tx->pending);
769 kfree(tid_tx);
Yogesh Ashok Powar42624d42011-12-08 14:56:15 +0530770 }
771
Johannes Bergd9a7ddb2011-12-14 12:35:30 +0100772 sta_info_free(local, sta);
Johannes Berg34e89502010-02-03 13:59:58 +0100773
774 return 0;
775}
776
777int sta_info_destroy_addr(struct ieee80211_sub_if_data *sdata, const u8 *addr)
778{
779 struct sta_info *sta;
780 int ret;
781
782 mutex_lock(&sdata->local->sta_mtx);
Johannes Berg7852e362012-01-20 13:55:24 +0100783 sta = sta_info_get(sdata, addr);
Johannes Berg34e89502010-02-03 13:59:58 +0100784 ret = __sta_info_destroy(sta);
785 mutex_unlock(&sdata->local->sta_mtx);
786
787 return ret;
788}
789
790int sta_info_destroy_addr_bss(struct ieee80211_sub_if_data *sdata,
791 const u8 *addr)
792{
793 struct sta_info *sta;
794 int ret;
795
796 mutex_lock(&sdata->local->sta_mtx);
Johannes Berg7852e362012-01-20 13:55:24 +0100797 sta = sta_info_get_bss(sdata, addr);
Johannes Berg34e89502010-02-03 13:59:58 +0100798 ret = __sta_info_destroy(sta);
799 mutex_unlock(&sdata->local->sta_mtx);
800
801 return ret;
802}
Jiri Bencf0706e82007-05-05 11:45:53 -0700803
804static void sta_info_cleanup(unsigned long data)
805{
806 struct ieee80211_local *local = (struct ieee80211_local *) data;
807 struct sta_info *sta;
Juuso Oikarinen3393a602010-04-19 10:12:52 +0300808 bool timer_needed = false;
Jiri Bencf0706e82007-05-05 11:45:53 -0700809
Johannes Bergd0709a62008-02-25 16:27:46 +0100810 rcu_read_lock();
811 list_for_each_entry_rcu(sta, &local->sta_list, list)
Juuso Oikarinen3393a602010-04-19 10:12:52 +0300812 if (sta_info_cleanup_expire_buffered(local, sta))
813 timer_needed = true;
Johannes Bergd0709a62008-02-25 16:27:46 +0100814 rcu_read_unlock();
Jiri Bencf0706e82007-05-05 11:45:53 -0700815
Johannes Berg5bb644a2009-05-17 11:40:42 +0200816 if (local->quiescing)
817 return;
818
Juuso Oikarinen3393a602010-04-19 10:12:52 +0300819 if (!timer_needed)
820 return;
821
Johannes Berg26d59532011-04-01 13:52:48 +0200822 mod_timer(&local->sta_cleanup,
823 round_jiffies(jiffies + STA_INFO_CLEANUP_INTERVAL));
Jiri Bencf0706e82007-05-05 11:45:53 -0700824}
825
826void sta_info_init(struct ieee80211_local *local)
827{
Johannes Berg4d339602011-12-15 11:24:20 +0100828 spin_lock_init(&local->tim_lock);
Johannes Berg34e89502010-02-03 13:59:58 +0100829 mutex_init(&local->sta_mtx);
Jiri Bencf0706e82007-05-05 11:45:53 -0700830 INIT_LIST_HEAD(&local->sta_list);
Jiri Bencf0706e82007-05-05 11:45:53 -0700831
Pavel Emelyanovb24b8a22008-01-23 21:20:07 -0800832 setup_timer(&local->sta_cleanup, sta_info_cleanup,
833 (unsigned long)local);
Jiri Bencf0706e82007-05-05 11:45:53 -0700834}
835
836void sta_info_stop(struct ieee80211_local *local)
837{
Jiri Bencf0706e82007-05-05 11:45:53 -0700838 del_timer(&local->sta_cleanup);
Michael Wube8755e2007-07-27 15:43:23 +0200839 sta_info_flush(local, NULL);
Jiri Bencf0706e82007-05-05 11:45:53 -0700840}
841
Jiri Bencf0706e82007-05-05 11:45:53 -0700842/**
843 * sta_info_flush - flush matching STA entries from the STA table
Johannes Berg44213b52008-02-25 16:27:49 +0100844 *
845 * Returns the number of removed STA entries.
846 *
Jiri Bencf0706e82007-05-05 11:45:53 -0700847 * @local: local interface data
Johannes Bergd0709a62008-02-25 16:27:46 +0100848 * @sdata: matching rule for the net device (sta->dev) or %NULL to match all STAs
Jiri Bencf0706e82007-05-05 11:45:53 -0700849 */
Johannes Berg44213b52008-02-25 16:27:49 +0100850int sta_info_flush(struct ieee80211_local *local,
Johannes Bergaf8cdcd2009-04-19 21:25:43 +0200851 struct ieee80211_sub_if_data *sdata)
Jiri Bencf0706e82007-05-05 11:45:53 -0700852{
853 struct sta_info *sta, *tmp;
Johannes Berg44213b52008-02-25 16:27:49 +0100854 int ret = 0;
Jiri Bencf0706e82007-05-05 11:45:53 -0700855
Johannes Bergd0709a62008-02-25 16:27:46 +0100856 might_sleep();
857
Johannes Berg34e89502010-02-03 13:59:58 +0100858 mutex_lock(&local->sta_mtx);
Johannes Berg34e89502010-02-03 13:59:58 +0100859 list_for_each_entry_safe(sta, tmp, &local->sta_list, list) {
Johannes Berg34316832012-02-25 21:40:46 +0100860 if (!sdata || sdata == sta->sdata) {
Johannes Berg34e89502010-02-03 13:59:58 +0100861 WARN_ON(__sta_info_destroy(sta));
Johannes Berg34316832012-02-25 21:40:46 +0100862 ret++;
863 }
Johannes Berg34e89502010-02-03 13:59:58 +0100864 }
865 mutex_unlock(&local->sta_mtx);
Johannes Berg44213b52008-02-25 16:27:49 +0100866
867 return ret;
Jiri Bencf0706e82007-05-05 11:45:53 -0700868}
Johannes Bergdc6676b2008-03-31 19:23:03 +0200869
Johannes Berg24723d12008-09-11 00:01:46 +0200870void ieee80211_sta_expire(struct ieee80211_sub_if_data *sdata,
871 unsigned long exp_time)
872{
873 struct ieee80211_local *local = sdata->local;
874 struct sta_info *sta, *tmp;
Johannes Berg24723d12008-09-11 00:01:46 +0200875
Johannes Berg34e89502010-02-03 13:59:58 +0100876 mutex_lock(&local->sta_mtx);
Mohammed Shafi Shajakhane46a2cf2011-12-26 10:43:29 +0530877
878 list_for_each_entry_safe(sta, tmp, &local->sta_list, list) {
Marek Lindnerec2b7742011-12-20 23:16:52 +0800879 if (sdata != sta->sdata)
880 continue;
881
Johannes Berg24723d12008-09-11 00:01:46 +0200882 if (time_after(jiffies, sta->last_rx + exp_time)) {
Johannes Bergbdcbd8e2012-06-22 11:29:50 +0200883 ibss_dbg(sdata, "expiring inactive STA %pM\n",
884 sta->sta.addr);
Johannes Berg34e89502010-02-03 13:59:58 +0100885 WARN_ON(__sta_info_destroy(sta));
Johannes Berg24723d12008-09-11 00:01:46 +0200886 }
Mohammed Shafi Shajakhane46a2cf2011-12-26 10:43:29 +0530887 }
888
Johannes Berg34e89502010-02-03 13:59:58 +0100889 mutex_unlock(&local->sta_mtx);
Johannes Berg24723d12008-09-11 00:01:46 +0200890}
Johannes Berg17741cd2008-09-11 00:02:02 +0200891
Ben Greear686b9cb2010-09-23 09:44:36 -0700892struct ieee80211_sta *ieee80211_find_sta_by_ifaddr(struct ieee80211_hw *hw,
893 const u8 *addr,
894 const u8 *localaddr)
Johannes Berg17741cd2008-09-11 00:02:02 +0200895{
Johannes Bergabe60632009-11-25 17:46:18 +0100896 struct sta_info *sta, *nxt;
Johannes Berg17741cd2008-09-11 00:02:02 +0200897
Ben Greear686b9cb2010-09-23 09:44:36 -0700898 /*
899 * Just return a random station if localaddr is NULL
900 * ... first in list.
901 */
Johannes Bergf7c65592010-04-30 13:48:36 +0200902 for_each_sta_info(hw_to_local(hw), addr, sta, nxt) {
Ben Greear686b9cb2010-09-23 09:44:36 -0700903 if (localaddr &&
Joe Perchesb203ca32012-05-08 18:56:52 +0000904 !ether_addr_equal(sta->sdata->vif.addr, localaddr))
Ben Greear686b9cb2010-09-23 09:44:36 -0700905 continue;
Johannes Bergf7c65592010-04-30 13:48:36 +0200906 if (!sta->uploaded)
907 return NULL;
Johannes Bergabe60632009-11-25 17:46:18 +0100908 return &sta->sta;
Johannes Bergf7c65592010-04-30 13:48:36 +0200909 }
910
Johannes Bergabe60632009-11-25 17:46:18 +0100911 return NULL;
Johannes Berg17741cd2008-09-11 00:02:02 +0200912}
Ben Greear686b9cb2010-09-23 09:44:36 -0700913EXPORT_SYMBOL_GPL(ieee80211_find_sta_by_ifaddr);
Johannes Berg5ed176e2009-11-04 14:42:28 +0100914
915struct ieee80211_sta *ieee80211_find_sta(struct ieee80211_vif *vif,
916 const u8 *addr)
917{
Johannes Bergf7c65592010-04-30 13:48:36 +0200918 struct sta_info *sta;
Johannes Berg5ed176e2009-11-04 14:42:28 +0100919
920 if (!vif)
921 return NULL;
922
Johannes Bergf7c65592010-04-30 13:48:36 +0200923 sta = sta_info_get_bss(vif_to_sdata(vif), addr);
924 if (!sta)
925 return NULL;
Johannes Berg5ed176e2009-11-04 14:42:28 +0100926
Johannes Bergf7c65592010-04-30 13:48:36 +0200927 if (!sta->uploaded)
928 return NULL;
929
930 return &sta->sta;
Johannes Berg5ed176e2009-11-04 14:42:28 +0100931}
Johannes Berg17741cd2008-09-11 00:02:02 +0200932EXPORT_SYMBOL(ieee80211_find_sta);
Johannes Bergaf818582009-11-06 11:35:50 +0100933
Johannes Berg50a94322010-11-16 11:50:28 -0800934static void clear_sta_ps_flags(void *_sta)
935{
936 struct sta_info *sta = _sta;
Helmut Schaa608383b2012-01-30 15:18:00 +0100937 struct ieee80211_sub_if_data *sdata = sta->sdata;
Johannes Berg50a94322010-11-16 11:50:28 -0800938
Johannes Bergc2c98fd2011-09-29 16:04:36 +0200939 clear_sta_flag(sta, WLAN_STA_PS_DRIVER);
Helmut Schaa608383b2012-01-30 15:18:00 +0100940 if (test_and_clear_sta_flag(sta, WLAN_STA_PS_STA))
941 atomic_dec(&sdata->bss->num_sta_ps);
Johannes Berg50a94322010-11-16 11:50:28 -0800942}
943
Johannes Bergaf818582009-11-06 11:35:50 +0100944/* powersave support code */
945void ieee80211_sta_ps_deliver_wakeup(struct sta_info *sta)
946{
947 struct ieee80211_sub_if_data *sdata = sta->sdata;
948 struct ieee80211_local *local = sdata->local;
Johannes Berg948d8872011-09-29 16:04:29 +0200949 struct sk_buff_head pending;
950 int filtered = 0, buffered = 0, ac;
Johannes Bergaf818582009-11-06 11:35:50 +0100951
Johannes Bergc2c98fd2011-09-29 16:04:36 +0200952 clear_sta_flag(sta, WLAN_STA_SP);
Johannes Berg47086fc2011-09-29 16:04:33 +0200953
Johannes Berg948d8872011-09-29 16:04:29 +0200954 BUILD_BUG_ON(BITS_TO_LONGS(STA_TID_NUM) > 1);
955 sta->driver_buffered_tids = 0;
956
Arik Nemtsovd057e5a2011-01-31 22:29:13 +0200957 if (!(local->hw.flags & IEEE80211_HW_AP_LINK_PS))
958 drv_sta_notify(local, sdata, STA_NOTIFY_AWAKE, &sta->sta);
Johannes Bergaf818582009-11-06 11:35:50 +0100959
Johannes Berg948d8872011-09-29 16:04:29 +0200960 skb_queue_head_init(&pending);
Johannes Bergaf818582009-11-06 11:35:50 +0100961
962 /* Send all buffered frames to the station */
Johannes Berg948d8872011-09-29 16:04:29 +0200963 for (ac = 0; ac < IEEE80211_NUM_ACS; ac++) {
964 int count = skb_queue_len(&pending), tmp;
965
966 skb_queue_splice_tail_init(&sta->tx_filtered[ac], &pending);
967 tmp = skb_queue_len(&pending);
968 filtered += tmp - count;
969 count = tmp;
970
971 skb_queue_splice_tail_init(&sta->ps_tx_buf[ac], &pending);
972 tmp = skb_queue_len(&pending);
973 buffered += tmp - count;
974 }
975
976 ieee80211_add_pending_skbs_fn(local, &pending, clear_sta_ps_flags, sta);
977
Johannes Bergaf818582009-11-06 11:35:50 +0100978 local->total_ps_buffered -= buffered;
979
Johannes Bergc868cb352011-09-29 16:04:27 +0200980 sta_info_recalc_tim(sta);
981
Johannes Bergbdcbd8e2012-06-22 11:29:50 +0200982 ps_dbg(sdata,
983 "STA %pM aid %d sending %d filtered/%d PS frames since STA not sleeping anymore\n",
984 sta->sta.addr, sta->sta.aid, filtered, buffered);
Johannes Bergaf818582009-11-06 11:35:50 +0100985}
986
Johannes Bergce662b442011-09-29 16:04:34 +0200987static void ieee80211_send_null_response(struct ieee80211_sub_if_data *sdata,
988 struct sta_info *sta, int tid,
Johannes Berg40b96402011-09-29 16:04:38 +0200989 enum ieee80211_frame_release_type reason)
Johannes Bergce662b442011-09-29 16:04:34 +0200990{
991 struct ieee80211_local *local = sdata->local;
992 struct ieee80211_qos_hdr *nullfunc;
993 struct sk_buff *skb;
994 int size = sizeof(*nullfunc);
995 __le16 fc;
Johannes Bergc2c98fd2011-09-29 16:04:36 +0200996 bool qos = test_sta_flag(sta, WLAN_STA_WME);
Johannes Bergce662b442011-09-29 16:04:34 +0200997 struct ieee80211_tx_info *info;
998
999 if (qos) {
1000 fc = cpu_to_le16(IEEE80211_FTYPE_DATA |
1001 IEEE80211_STYPE_QOS_NULLFUNC |
1002 IEEE80211_FCTL_FROMDS);
1003 } else {
1004 size -= 2;
1005 fc = cpu_to_le16(IEEE80211_FTYPE_DATA |
1006 IEEE80211_STYPE_NULLFUNC |
1007 IEEE80211_FCTL_FROMDS);
1008 }
1009
1010 skb = dev_alloc_skb(local->hw.extra_tx_headroom + size);
1011 if (!skb)
1012 return;
1013
1014 skb_reserve(skb, local->hw.extra_tx_headroom);
1015
1016 nullfunc = (void *) skb_put(skb, size);
1017 nullfunc->frame_control = fc;
1018 nullfunc->duration_id = 0;
1019 memcpy(nullfunc->addr1, sta->sta.addr, ETH_ALEN);
1020 memcpy(nullfunc->addr2, sdata->vif.addr, ETH_ALEN);
1021 memcpy(nullfunc->addr3, sdata->vif.addr, ETH_ALEN);
1022
Johannes Berg59b66252011-10-13 13:19:19 +02001023 skb->priority = tid;
1024 skb_set_queue_mapping(skb, ieee802_1d_to_ac[tid]);
Johannes Bergce662b442011-09-29 16:04:34 +02001025 if (qos) {
Johannes Bergce662b442011-09-29 16:04:34 +02001026 nullfunc->qos_ctrl = cpu_to_le16(tid);
1027
Johannes Berg40b96402011-09-29 16:04:38 +02001028 if (reason == IEEE80211_FRAME_RELEASE_UAPSD)
Johannes Bergce662b442011-09-29 16:04:34 +02001029 nullfunc->qos_ctrl |=
1030 cpu_to_le16(IEEE80211_QOS_CTL_EOSP);
1031 }
1032
1033 info = IEEE80211_SKB_CB(skb);
1034
1035 /*
1036 * Tell TX path to send this frame even though the
1037 * STA may still remain is PS mode after this frame
Johannes Bergdeeaee12011-09-29 16:04:35 +02001038 * exchange. Also set EOSP to indicate this packet
1039 * ends the poll/service period.
Johannes Bergce662b442011-09-29 16:04:34 +02001040 */
Johannes Berg02f2f1a2012-02-27 12:18:30 +01001041 info->flags |= IEEE80211_TX_CTL_NO_PS_BUFFER |
Johannes Bergdeeaee12011-09-29 16:04:35 +02001042 IEEE80211_TX_STATUS_EOSP |
1043 IEEE80211_TX_CTL_REQ_TX_STATUS;
Johannes Bergce662b442011-09-29 16:04:34 +02001044
Johannes Berg40b96402011-09-29 16:04:38 +02001045 drv_allow_buffered_frames(local, sta, BIT(tid), 1, reason, false);
1046
Johannes Bergce662b442011-09-29 16:04:34 +02001047 ieee80211_xmit(sdata, skb);
1048}
1049
Johannes Berg47086fc2011-09-29 16:04:33 +02001050static void
1051ieee80211_sta_ps_deliver_response(struct sta_info *sta,
1052 int n_frames, u8 ignored_acs,
1053 enum ieee80211_frame_release_type reason)
Johannes Bergaf818582009-11-06 11:35:50 +01001054{
1055 struct ieee80211_sub_if_data *sdata = sta->sdata;
1056 struct ieee80211_local *local = sdata->local;
Johannes Berg4049e092011-09-29 16:04:32 +02001057 bool found = false;
Johannes Berg948d8872011-09-29 16:04:29 +02001058 bool more_data = false;
1059 int ac;
Johannes Berg4049e092011-09-29 16:04:32 +02001060 unsigned long driver_release_tids = 0;
Johannes Berg47086fc2011-09-29 16:04:33 +02001061 struct sk_buff_head frames;
1062
Johannes Bergdeeaee12011-09-29 16:04:35 +02001063 /* Service or PS-Poll period starts */
Johannes Bergc2c98fd2011-09-29 16:04:36 +02001064 set_sta_flag(sta, WLAN_STA_SP);
Johannes Bergdeeaee12011-09-29 16:04:35 +02001065
Johannes Berg47086fc2011-09-29 16:04:33 +02001066 __skb_queue_head_init(&frames);
Johannes Bergaf818582009-11-06 11:35:50 +01001067
Johannes Berg948d8872011-09-29 16:04:29 +02001068 /*
Johannes Berg47086fc2011-09-29 16:04:33 +02001069 * Get response frame(s) and more data bit for it.
Johannes Berg948d8872011-09-29 16:04:29 +02001070 */
1071 for (ac = 0; ac < IEEE80211_NUM_ACS; ac++) {
Johannes Berg4049e092011-09-29 16:04:32 +02001072 unsigned long tids;
1073
Johannes Berg47086fc2011-09-29 16:04:33 +02001074 if (ignored_acs & BIT(ac))
Johannes Berg948d8872011-09-29 16:04:29 +02001075 continue;
1076
Johannes Berg4049e092011-09-29 16:04:32 +02001077 tids = ieee80211_tids_for_ac(ac);
1078
1079 if (!found) {
1080 driver_release_tids = sta->driver_buffered_tids & tids;
1081 if (driver_release_tids) {
1082 found = true;
1083 } else {
Johannes Berg47086fc2011-09-29 16:04:33 +02001084 struct sk_buff *skb;
1085
1086 while (n_frames > 0) {
1087 skb = skb_dequeue(&sta->tx_filtered[ac]);
1088 if (!skb) {
1089 skb = skb_dequeue(
1090 &sta->ps_tx_buf[ac]);
1091 if (skb)
1092 local->total_ps_buffered--;
1093 }
1094 if (!skb)
1095 break;
1096 n_frames--;
Johannes Berg4049e092011-09-29 16:04:32 +02001097 found = true;
Johannes Berg47086fc2011-09-29 16:04:33 +02001098 __skb_queue_tail(&frames, skb);
1099 }
Johannes Berg4049e092011-09-29 16:04:32 +02001100 }
1101
1102 /*
1103 * If the driver has data on more than one TID then
1104 * certainly there's more data if we release just a
1105 * single frame now (from a single TID).
1106 */
Johannes Berg47086fc2011-09-29 16:04:33 +02001107 if (reason == IEEE80211_FRAME_RELEASE_PSPOLL &&
1108 hweight16(driver_release_tids) > 1) {
Johannes Berg4049e092011-09-29 16:04:32 +02001109 more_data = true;
1110 driver_release_tids =
1111 BIT(ffs(driver_release_tids) - 1);
1112 break;
Johannes Berg948d8872011-09-29 16:04:29 +02001113 }
1114 }
1115
Johannes Berg948d8872011-09-29 16:04:29 +02001116 if (!skb_queue_empty(&sta->tx_filtered[ac]) ||
1117 !skb_queue_empty(&sta->ps_tx_buf[ac])) {
1118 more_data = true;
1119 break;
1120 }
Johannes Bergaf818582009-11-06 11:35:50 +01001121 }
Johannes Bergaf818582009-11-06 11:35:50 +01001122
Johannes Berg4049e092011-09-29 16:04:32 +02001123 if (!found) {
Johannes Bergce662b442011-09-29 16:04:34 +02001124 int tid;
Johannes Berg4049e092011-09-29 16:04:32 +02001125
Johannes Bergce662b442011-09-29 16:04:34 +02001126 /*
1127 * For PS-Poll, this can only happen due to a race condition
1128 * when we set the TIM bit and the station notices it, but
1129 * before it can poll for the frame we expire it.
1130 *
1131 * For uAPSD, this is said in the standard (11.2.1.5 h):
1132 * At each unscheduled SP for a non-AP STA, the AP shall
1133 * attempt to transmit at least one MSDU or MMPDU, but no
1134 * more than the value specified in the Max SP Length field
1135 * in the QoS Capability element from delivery-enabled ACs,
1136 * that are destined for the non-AP STA.
1137 *
1138 * Since we have no other MSDU/MMPDU, transmit a QoS null frame.
1139 */
1140
1141 /* This will evaluate to 1, 3, 5 or 7. */
1142 tid = 7 - ((ffs(~ignored_acs) - 1) << 1);
1143
Johannes Berg40b96402011-09-29 16:04:38 +02001144 ieee80211_send_null_response(sdata, sta, tid, reason);
Johannes Berg4049e092011-09-29 16:04:32 +02001145 return;
1146 }
1147
Johannes Berg47086fc2011-09-29 16:04:33 +02001148 if (!driver_release_tids) {
1149 struct sk_buff_head pending;
1150 struct sk_buff *skb;
Johannes Berg40b96402011-09-29 16:04:38 +02001151 int num = 0;
1152 u16 tids = 0;
Johannes Bergaf818582009-11-06 11:35:50 +01001153
Johannes Berg47086fc2011-09-29 16:04:33 +02001154 skb_queue_head_init(&pending);
Johannes Bergaf818582009-11-06 11:35:50 +01001155
Johannes Berg47086fc2011-09-29 16:04:33 +02001156 while ((skb = __skb_dequeue(&frames))) {
1157 struct ieee80211_tx_info *info = IEEE80211_SKB_CB(skb);
1158 struct ieee80211_hdr *hdr = (void *) skb->data;
Johannes Berg40b96402011-09-29 16:04:38 +02001159 u8 *qoshdr = NULL;
1160
1161 num++;
Johannes Bergaf818582009-11-06 11:35:50 +01001162
Johannes Berg47086fc2011-09-29 16:04:33 +02001163 /*
1164 * Tell TX path to send this frame even though the
1165 * STA may still remain is PS mode after this frame
1166 * exchange.
1167 */
Johannes Berg02f2f1a2012-02-27 12:18:30 +01001168 info->flags |= IEEE80211_TX_CTL_NO_PS_BUFFER;
Johannes Bergaf818582009-11-06 11:35:50 +01001169
Johannes Berg47086fc2011-09-29 16:04:33 +02001170 /*
1171 * Use MoreData flag to indicate whether there are
1172 * more buffered frames for this STA
1173 */
Janusz.Dziedzic@tieto.com24b9c372011-11-07 09:47:47 +02001174 if (more_data || !skb_queue_empty(&frames))
Johannes Berg47086fc2011-09-29 16:04:33 +02001175 hdr->frame_control |=
1176 cpu_to_le16(IEEE80211_FCTL_MOREDATA);
Janusz.Dziedzic@tieto.com24b9c372011-11-07 09:47:47 +02001177 else
1178 hdr->frame_control &=
1179 cpu_to_le16(~IEEE80211_FCTL_MOREDATA);
Johannes Berg47086fc2011-09-29 16:04:33 +02001180
Johannes Berg40b96402011-09-29 16:04:38 +02001181 if (ieee80211_is_data_qos(hdr->frame_control) ||
1182 ieee80211_is_qos_nullfunc(hdr->frame_control))
1183 qoshdr = ieee80211_get_qos_ctl(hdr);
1184
Marco Porsch52a3f202012-03-16 15:30:26 +01001185 /* end service period after last frame */
1186 if (skb_queue_empty(&frames)) {
1187 if (reason == IEEE80211_FRAME_RELEASE_UAPSD &&
1188 qoshdr)
1189 *qoshdr |= IEEE80211_QOS_CTL_EOSP;
Johannes Berg47086fc2011-09-29 16:04:33 +02001190
Marco Porsch52a3f202012-03-16 15:30:26 +01001191 info->flags |= IEEE80211_TX_STATUS_EOSP |
1192 IEEE80211_TX_CTL_REQ_TX_STATUS;
1193 }
Johannes Bergdeeaee12011-09-29 16:04:35 +02001194
Johannes Berg40b96402011-09-29 16:04:38 +02001195 if (qoshdr)
1196 tids |= BIT(*qoshdr & IEEE80211_QOS_CTL_TID_MASK);
1197 else
1198 tids |= BIT(0);
1199
Johannes Berg47086fc2011-09-29 16:04:33 +02001200 __skb_queue_tail(&pending, skb);
1201 }
1202
Johannes Berg40b96402011-09-29 16:04:38 +02001203 drv_allow_buffered_frames(local, sta, tids, num,
1204 reason, more_data);
1205
Johannes Berg47086fc2011-09-29 16:04:33 +02001206 ieee80211_add_pending_skbs(local, &pending);
Johannes Bergaf818582009-11-06 11:35:50 +01001207
Johannes Bergc868cb352011-09-29 16:04:27 +02001208 sta_info_recalc_tim(sta);
Johannes Bergaf818582009-11-06 11:35:50 +01001209 } else {
1210 /*
Johannes Berg4049e092011-09-29 16:04:32 +02001211 * We need to release a frame that is buffered somewhere in the
1212 * driver ... it'll have to handle that.
1213 * Note that, as per the comment above, it'll also have to see
1214 * if there is more than just one frame on the specific TID that
1215 * we're releasing from, and it needs to set the more-data bit
1216 * accordingly if we tell it that there's no more data. If we do
1217 * tell it there's more data, then of course the more-data bit
1218 * needs to be set anyway.
Johannes Bergaf818582009-11-06 11:35:50 +01001219 */
Johannes Berg4049e092011-09-29 16:04:32 +02001220 drv_release_buffered_frames(local, sta, driver_release_tids,
Johannes Berg47086fc2011-09-29 16:04:33 +02001221 n_frames, reason, more_data);
Johannes Berg4049e092011-09-29 16:04:32 +02001222
1223 /*
1224 * Note that we don't recalculate the TIM bit here as it would
1225 * most likely have no effect at all unless the driver told us
1226 * that the TID became empty before returning here from the
1227 * release function.
1228 * Either way, however, when the driver tells us that the TID
1229 * became empty we'll do the TIM recalculation.
1230 */
Johannes Bergaf818582009-11-06 11:35:50 +01001231 }
1232}
1233
Johannes Bergaf818582009-11-06 11:35:50 +01001234void ieee80211_sta_ps_deliver_poll_response(struct sta_info *sta)
1235{
Johannes Berg47086fc2011-09-29 16:04:33 +02001236 u8 ignore_for_response = sta->sta.uapsd_queues;
Johannes Bergaf818582009-11-06 11:35:50 +01001237
Johannes Berg47086fc2011-09-29 16:04:33 +02001238 /*
1239 * If all ACs are delivery-enabled then we should reply
1240 * from any of them, if only some are enabled we reply
1241 * only from the non-enabled ones.
1242 */
1243 if (ignore_for_response == BIT(IEEE80211_NUM_ACS) - 1)
1244 ignore_for_response = 0;
1245
1246 ieee80211_sta_ps_deliver_response(sta, 1, ignore_for_response,
1247 IEEE80211_FRAME_RELEASE_PSPOLL);
1248}
1249
1250void ieee80211_sta_ps_deliver_uapsd(struct sta_info *sta)
1251{
1252 int n_frames = sta->sta.max_sp;
1253 u8 delivery_enabled = sta->sta.uapsd_queues;
1254
1255 /*
1256 * If we ever grow support for TSPEC this might happen if
1257 * the TSPEC update from hostapd comes in between a trigger
1258 * frame setting WLAN_STA_UAPSD in the RX path and this
1259 * actually getting called.
1260 */
1261 if (!delivery_enabled)
1262 return;
1263
Johannes Berg47086fc2011-09-29 16:04:33 +02001264 switch (sta->sta.max_sp) {
1265 case 1:
1266 n_frames = 2;
1267 break;
1268 case 2:
1269 n_frames = 4;
1270 break;
1271 case 3:
1272 n_frames = 6;
1273 break;
1274 case 0:
1275 /* XXX: what is a good value? */
1276 n_frames = 8;
1277 break;
Johannes Bergaf818582009-11-06 11:35:50 +01001278 }
Johannes Bergaf818582009-11-06 11:35:50 +01001279
Johannes Berg47086fc2011-09-29 16:04:33 +02001280 ieee80211_sta_ps_deliver_response(sta, n_frames, ~delivery_enabled,
1281 IEEE80211_FRAME_RELEASE_UAPSD);
Johannes Bergaf818582009-11-06 11:35:50 +01001282}
1283
1284void ieee80211_sta_block_awake(struct ieee80211_hw *hw,
1285 struct ieee80211_sta *pubsta, bool block)
1286{
1287 struct sta_info *sta = container_of(pubsta, struct sta_info, sta);
1288
Johannes Bergb5878a22010-04-07 16:48:40 +02001289 trace_api_sta_block_awake(sta->local, pubsta, block);
1290
Johannes Bergaf818582009-11-06 11:35:50 +01001291 if (block)
Johannes Bergc2c98fd2011-09-29 16:04:36 +02001292 set_sta_flag(sta, WLAN_STA_PS_DRIVER);
1293 else if (test_sta_flag(sta, WLAN_STA_PS_DRIVER))
Johannes Bergaf818582009-11-06 11:35:50 +01001294 ieee80211_queue_work(hw, &sta->drv_unblock_wk);
1295}
1296EXPORT_SYMBOL(ieee80211_sta_block_awake);
Felix Fietkaudcf55fb2011-04-17 17:45:00 +02001297
Johannes Berg37fbd902011-09-29 16:04:39 +02001298void ieee80211_sta_eosp_irqsafe(struct ieee80211_sta *pubsta)
1299{
1300 struct sta_info *sta = container_of(pubsta, struct sta_info, sta);
1301 struct ieee80211_local *local = sta->local;
1302 struct sk_buff *skb;
1303 struct skb_eosp_msg_data *data;
1304
1305 trace_api_eosp(local, pubsta);
1306
1307 skb = alloc_skb(0, GFP_ATOMIC);
1308 if (!skb) {
1309 /* too bad ... but race is better than loss */
1310 clear_sta_flag(sta, WLAN_STA_SP);
1311 return;
1312 }
1313
1314 data = (void *)skb->cb;
1315 memcpy(data->sta, pubsta->addr, ETH_ALEN);
1316 memcpy(data->iface, sta->sdata->vif.addr, ETH_ALEN);
1317 skb->pkt_type = IEEE80211_EOSP_MSG;
1318 skb_queue_tail(&local->skb_queue, skb);
1319 tasklet_schedule(&local->tasklet);
1320}
1321EXPORT_SYMBOL(ieee80211_sta_eosp_irqsafe);
1322
Johannes Berg042ec452011-09-29 16:04:26 +02001323void ieee80211_sta_set_buffered(struct ieee80211_sta *pubsta,
1324 u8 tid, bool buffered)
Felix Fietkaudcf55fb2011-04-17 17:45:00 +02001325{
1326 struct sta_info *sta = container_of(pubsta, struct sta_info, sta);
1327
Johannes Berg948d8872011-09-29 16:04:29 +02001328 if (WARN_ON(tid >= STA_TID_NUM))
Johannes Berg042ec452011-09-29 16:04:26 +02001329 return;
1330
Johannes Berg948d8872011-09-29 16:04:29 +02001331 if (buffered)
1332 set_bit(tid, &sta->driver_buffered_tids);
1333 else
1334 clear_bit(tid, &sta->driver_buffered_tids);
1335
Johannes Bergc868cb352011-09-29 16:04:27 +02001336 sta_info_recalc_tim(sta);
Felix Fietkaudcf55fb2011-04-17 17:45:00 +02001337}
Johannes Berg042ec452011-09-29 16:04:26 +02001338EXPORT_SYMBOL(ieee80211_sta_set_buffered);
Johannes Bergd9a7ddb2011-12-14 12:35:30 +01001339
Johannes Berg83d5cc02012-01-12 09:31:10 +01001340int sta_info_move_state(struct sta_info *sta,
1341 enum ieee80211_sta_state new_state)
Johannes Bergd9a7ddb2011-12-14 12:35:30 +01001342{
Johannes Berg8bf11d82011-12-15 11:17:37 +01001343 might_sleep();
Johannes Bergd9a7ddb2011-12-14 12:35:30 +01001344
1345 if (sta->sta_state == new_state)
1346 return 0;
1347
Johannes Bergf09603a2012-01-20 13:55:21 +01001348 /* check allowed transitions first */
1349
Johannes Bergd9a7ddb2011-12-14 12:35:30 +01001350 switch (new_state) {
1351 case IEEE80211_STA_NONE:
Johannes Bergf09603a2012-01-20 13:55:21 +01001352 if (sta->sta_state != IEEE80211_STA_AUTH)
Johannes Bergd9a7ddb2011-12-14 12:35:30 +01001353 return -EINVAL;
1354 break;
1355 case IEEE80211_STA_AUTH:
Johannes Bergf09603a2012-01-20 13:55:21 +01001356 if (sta->sta_state != IEEE80211_STA_NONE &&
1357 sta->sta_state != IEEE80211_STA_ASSOC)
Johannes Bergd9a7ddb2011-12-14 12:35:30 +01001358 return -EINVAL;
1359 break;
1360 case IEEE80211_STA_ASSOC:
Johannes Bergf09603a2012-01-20 13:55:21 +01001361 if (sta->sta_state != IEEE80211_STA_AUTH &&
1362 sta->sta_state != IEEE80211_STA_AUTHORIZED)
Johannes Bergd9a7ddb2011-12-14 12:35:30 +01001363 return -EINVAL;
1364 break;
1365 case IEEE80211_STA_AUTHORIZED:
Johannes Bergf09603a2012-01-20 13:55:21 +01001366 if (sta->sta_state != IEEE80211_STA_ASSOC)
Johannes Bergd9a7ddb2011-12-14 12:35:30 +01001367 return -EINVAL;
1368 break;
1369 default:
1370 WARN(1, "invalid state %d", new_state);
1371 return -EINVAL;
1372 }
1373
Johannes Bergbdcbd8e2012-06-22 11:29:50 +02001374 sta_dbg(sta->sdata, "moving STA %pM to state %d\n",
1375 sta->sta.addr, new_state);
Johannes Bergf09603a2012-01-20 13:55:21 +01001376
1377 /*
1378 * notify the driver before the actual changes so it can
1379 * fail the transition
1380 */
1381 if (test_sta_flag(sta, WLAN_STA_INSERTED)) {
1382 int err = drv_sta_state(sta->local, sta->sdata, sta,
1383 sta->sta_state, new_state);
1384 if (err)
1385 return err;
1386 }
1387
1388 /* reflect the change in all state variables */
1389
1390 switch (new_state) {
1391 case IEEE80211_STA_NONE:
1392 if (sta->sta_state == IEEE80211_STA_AUTH)
1393 clear_bit(WLAN_STA_AUTH, &sta->_flags);
1394 break;
1395 case IEEE80211_STA_AUTH:
1396 if (sta->sta_state == IEEE80211_STA_NONE)
1397 set_bit(WLAN_STA_AUTH, &sta->_flags);
1398 else if (sta->sta_state == IEEE80211_STA_ASSOC)
1399 clear_bit(WLAN_STA_ASSOC, &sta->_flags);
1400 break;
1401 case IEEE80211_STA_ASSOC:
1402 if (sta->sta_state == IEEE80211_STA_AUTH) {
1403 set_bit(WLAN_STA_ASSOC, &sta->_flags);
1404 } else if (sta->sta_state == IEEE80211_STA_AUTHORIZED) {
Felix Fietkau7e3ed022012-04-23 19:49:03 +02001405 if (sta->sdata->vif.type == NL80211_IFTYPE_AP ||
1406 (sta->sdata->vif.type == NL80211_IFTYPE_AP_VLAN &&
1407 !sta->sdata->u.vlan.sta))
1408 atomic_dec(&sta->sdata->bss->num_mcast_sta);
Johannes Bergf09603a2012-01-20 13:55:21 +01001409 clear_bit(WLAN_STA_AUTHORIZED, &sta->_flags);
1410 }
1411 break;
1412 case IEEE80211_STA_AUTHORIZED:
1413 if (sta->sta_state == IEEE80211_STA_ASSOC) {
Felix Fietkau7e3ed022012-04-23 19:49:03 +02001414 if (sta->sdata->vif.type == NL80211_IFTYPE_AP ||
1415 (sta->sdata->vif.type == NL80211_IFTYPE_AP_VLAN &&
1416 !sta->sdata->u.vlan.sta))
1417 atomic_inc(&sta->sdata->bss->num_mcast_sta);
Johannes Bergf09603a2012-01-20 13:55:21 +01001418 set_bit(WLAN_STA_AUTHORIZED, &sta->_flags);
1419 }
1420 break;
1421 default:
1422 break;
1423 }
1424
Johannes Bergd9a7ddb2011-12-14 12:35:30 +01001425 sta->sta_state = new_state;
1426
1427 return 0;
1428}