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b203ffc3 JM |
1 | /* |
2 | * Off-channel operation helpers | |
3 | * | |
4 | * Copyright 2003, Jouni Malinen <jkmaline@cc.hut.fi> | |
5 | * Copyright 2004, Instant802 Networks, Inc. | |
6 | * Copyright 2005, Devicescape Software, Inc. | |
7 | * Copyright 2006-2007 Jiri Benc <jbenc@suse.cz> | |
8 | * Copyright 2007, Michael Wu <flamingice@sourmilk.net> | |
9 | * Copyright 2009 Johannes Berg <johannes@sipsolutions.net> | |
10 | * | |
11 | * This program is free software; you can redistribute it and/or modify | |
12 | * it under the terms of the GNU General Public License version 2 as | |
13 | * published by the Free Software Foundation. | |
14 | */ | |
15 | #include <net/mac80211.h> | |
16 | #include "ieee80211_i.h" | |
21f83589 | 17 | #include "driver-trace.h" |
b203ffc3 JM |
18 | |
19 | /* | |
20 | * inform AP that we will go to sleep so that it will buffer the frames | |
21 | * while we scan | |
22 | */ | |
23 | static void ieee80211_offchannel_ps_enable(struct ieee80211_sub_if_data *sdata) | |
24 | { | |
25 | struct ieee80211_local *local = sdata->local; | |
4730d597 | 26 | struct ieee80211_if_managed *ifmgd = &sdata->u.mgd; |
b203ffc3 JM |
27 | |
28 | local->offchannel_ps_enabled = false; | |
29 | ||
30 | /* FIXME: what to do when local->pspolling is true? */ | |
31 | ||
32 | del_timer_sync(&local->dynamic_ps_timer); | |
3bc3c0d7 | 33 | del_timer_sync(&ifmgd->bcn_mon_timer); |
4730d597 LR |
34 | del_timer_sync(&ifmgd->conn_mon_timer); |
35 | ||
b203ffc3 JM |
36 | cancel_work_sync(&local->dynamic_ps_enable_work); |
37 | ||
38 | if (local->hw.conf.flags & IEEE80211_CONF_PS) { | |
39 | local->offchannel_ps_enabled = true; | |
40 | local->hw.conf.flags &= ~IEEE80211_CONF_PS; | |
41 | ieee80211_hw_config(local, IEEE80211_CONF_CHANGE_PS); | |
42 | } | |
43 | ||
44 | if (!(local->offchannel_ps_enabled) || | |
45 | !(local->hw.flags & IEEE80211_HW_PS_NULLFUNC_STACK)) | |
46 | /* | |
47 | * If power save was enabled, no need to send a nullfunc | |
48 | * frame because AP knows that we are sleeping. But if the | |
49 | * hardware is creating the nullfunc frame for power save | |
50 | * status (ie. IEEE80211_HW_PS_NULLFUNC_STACK is not | |
51 | * enabled) and power save was enabled, the firmware just | |
52 | * sent a null frame with power save disabled. So we need | |
53 | * to send a new nullfunc frame to inform the AP that we | |
54 | * are again sleeping. | |
55 | */ | |
56 | ieee80211_send_nullfunc(local, sdata, 1); | |
57 | } | |
58 | ||
59 | /* inform AP that we are awake again, unless power save is enabled */ | |
60 | static void ieee80211_offchannel_ps_disable(struct ieee80211_sub_if_data *sdata) | |
61 | { | |
62 | struct ieee80211_local *local = sdata->local; | |
63 | ||
64 | if (!local->ps_sdata) | |
65 | ieee80211_send_nullfunc(local, sdata, 0); | |
66 | else if (local->offchannel_ps_enabled) { | |
67 | /* | |
68 | * In !IEEE80211_HW_PS_NULLFUNC_STACK case the hardware | |
69 | * will send a nullfunc frame with the powersave bit set | |
70 | * even though the AP already knows that we are sleeping. | |
71 | * This could be avoided by sending a null frame with power | |
72 | * save bit disabled before enabling the power save, but | |
73 | * this doesn't gain anything. | |
74 | * | |
75 | * When IEEE80211_HW_PS_NULLFUNC_STACK is enabled, no need | |
76 | * to send a nullfunc frame because AP already knows that | |
77 | * we are sleeping, let's just enable power save mode in | |
78 | * hardware. | |
79 | */ | |
80 | local->hw.conf.flags |= IEEE80211_CONF_PS; | |
81 | ieee80211_hw_config(local, IEEE80211_CONF_CHANGE_PS); | |
82 | } else if (local->hw.conf.dynamic_ps_timeout > 0) { | |
83 | /* | |
84 | * If IEEE80211_CONF_PS was not set and the dynamic_ps_timer | |
85 | * had been running before leaving the operating channel, | |
86 | * restart the timer now and send a nullfunc frame to inform | |
87 | * the AP that we are awake. | |
88 | */ | |
89 | ieee80211_send_nullfunc(local, sdata, 0); | |
90 | mod_timer(&local->dynamic_ps_timer, jiffies + | |
91 | msecs_to_jiffies(local->hw.conf.dynamic_ps_timeout)); | |
92 | } | |
4730d597 | 93 | |
3bc3c0d7 | 94 | ieee80211_sta_reset_beacon_monitor(sdata); |
4730d597 | 95 | ieee80211_sta_reset_conn_monitor(sdata); |
b203ffc3 JM |
96 | } |
97 | ||
98 | void ieee80211_offchannel_stop_beaconing(struct ieee80211_local *local) | |
99 | { | |
100 | struct ieee80211_sub_if_data *sdata; | |
101 | ||
102 | mutex_lock(&local->iflist_mtx); | |
103 | list_for_each_entry(sdata, &local->interfaces, list) { | |
104 | if (!ieee80211_sdata_running(sdata)) | |
105 | continue; | |
106 | ||
107 | /* disable beaconing */ | |
108 | if (sdata->vif.type == NL80211_IFTYPE_AP || | |
109 | sdata->vif.type == NL80211_IFTYPE_ADHOC || | |
110 | sdata->vif.type == NL80211_IFTYPE_MESH_POINT) | |
111 | ieee80211_bss_info_change_notify( | |
112 | sdata, BSS_CHANGED_BEACON_ENABLED); | |
113 | ||
114 | /* | |
115 | * only handle non-STA interfaces here, STA interfaces | |
116 | * are handled in ieee80211_offchannel_stop_station(), | |
b8bc4b0a JB |
117 | * e.g., from the background scan state machine. |
118 | * | |
119 | * In addition, do not stop monitor interface to allow it to be | |
120 | * used from user space controlled off-channel operations. | |
b203ffc3 | 121 | */ |
b8bc4b0a | 122 | if (sdata->vif.type != NL80211_IFTYPE_STATION && |
5b714c6a JB |
123 | sdata->vif.type != NL80211_IFTYPE_MONITOR) { |
124 | set_bit(SDATA_STATE_OFFCHANNEL, &sdata->state); | |
cfa6cb20 | 125 | netif_tx_stop_all_queues(sdata->dev); |
5b714c6a | 126 | } |
b203ffc3 JM |
127 | } |
128 | mutex_unlock(&local->iflist_mtx); | |
129 | } | |
130 | ||
131 | void ieee80211_offchannel_stop_station(struct ieee80211_local *local) | |
132 | { | |
133 | struct ieee80211_sub_if_data *sdata; | |
134 | ||
135 | /* | |
136 | * notify the AP about us leaving the channel and stop all STA interfaces | |
137 | */ | |
138 | mutex_lock(&local->iflist_mtx); | |
139 | list_for_each_entry(sdata, &local->interfaces, list) { | |
140 | if (!ieee80211_sdata_running(sdata)) | |
141 | continue; | |
142 | ||
143 | if (sdata->vif.type == NL80211_IFTYPE_STATION) { | |
5b714c6a | 144 | set_bit(SDATA_STATE_OFFCHANNEL, &sdata->state); |
cfa6cb20 | 145 | netif_tx_stop_all_queues(sdata->dev); |
b203ffc3 JM |
146 | if (sdata->u.mgd.associated) |
147 | ieee80211_offchannel_ps_enable(sdata); | |
148 | } | |
149 | } | |
150 | mutex_unlock(&local->iflist_mtx); | |
151 | } | |
152 | ||
153 | void ieee80211_offchannel_return(struct ieee80211_local *local, | |
154 | bool enable_beaconing) | |
155 | { | |
156 | struct ieee80211_sub_if_data *sdata; | |
157 | ||
158 | mutex_lock(&local->iflist_mtx); | |
159 | list_for_each_entry(sdata, &local->interfaces, list) { | |
160 | if (!ieee80211_sdata_running(sdata)) | |
161 | continue; | |
162 | ||
163 | /* Tell AP we're back */ | |
164 | if (sdata->vif.type == NL80211_IFTYPE_STATION) { | |
165 | if (sdata->u.mgd.associated) | |
166 | ieee80211_offchannel_ps_disable(sdata); | |
b203ffc3 JM |
167 | } |
168 | ||
5b714c6a JB |
169 | if (sdata->vif.type != NL80211_IFTYPE_MONITOR) { |
170 | clear_bit(SDATA_STATE_OFFCHANNEL, &sdata->state); | |
171 | /* | |
172 | * This may wake up queues even though the driver | |
173 | * currently has them stopped. This is not very | |
174 | * likely, since the driver won't have gotten any | |
175 | * (or hardly any) new packets while we weren't | |
176 | * on the right channel, and even if it happens | |
177 | * it will at most lead to queueing up one more | |
178 | * packet per queue in mac80211 rather than on | |
179 | * the interface qdisc. | |
180 | */ | |
93895757 | 181 | netif_tx_wake_all_queues(sdata->dev); |
5b714c6a | 182 | } |
93895757 | 183 | |
b203ffc3 JM |
184 | /* re-enable beaconing */ |
185 | if (enable_beaconing && | |
186 | (sdata->vif.type == NL80211_IFTYPE_AP || | |
187 | sdata->vif.type == NL80211_IFTYPE_ADHOC || | |
188 | sdata->vif.type == NL80211_IFTYPE_MESH_POINT)) | |
189 | ieee80211_bss_info_change_notify( | |
190 | sdata, BSS_CHANGED_BEACON_ENABLED); | |
191 | } | |
192 | mutex_unlock(&local->iflist_mtx); | |
193 | } | |
21f83589 JB |
194 | |
195 | static void ieee80211_hw_roc_start(struct work_struct *work) | |
196 | { | |
197 | struct ieee80211_local *local = | |
198 | container_of(work, struct ieee80211_local, hw_roc_start); | |
199 | ||
200 | mutex_lock(&local->mtx); | |
201 | ||
202 | if (!local->hw_roc_channel) { | |
203 | mutex_unlock(&local->mtx); | |
204 | return; | |
205 | } | |
206 | ||
207 | ieee80211_recalc_idle(local); | |
208 | ||
209 | cfg80211_ready_on_channel(local->hw_roc_dev, local->hw_roc_cookie, | |
210 | local->hw_roc_channel, | |
211 | local->hw_roc_channel_type, | |
212 | local->hw_roc_duration, | |
213 | GFP_KERNEL); | |
214 | mutex_unlock(&local->mtx); | |
215 | } | |
216 | ||
217 | void ieee80211_ready_on_channel(struct ieee80211_hw *hw) | |
218 | { | |
219 | struct ieee80211_local *local = hw_to_local(hw); | |
220 | ||
221 | trace_api_ready_on_channel(local); | |
222 | ||
223 | ieee80211_queue_work(hw, &local->hw_roc_start); | |
224 | } | |
225 | EXPORT_SYMBOL_GPL(ieee80211_ready_on_channel); | |
226 | ||
227 | static void ieee80211_hw_roc_done(struct work_struct *work) | |
228 | { | |
229 | struct ieee80211_local *local = | |
230 | container_of(work, struct ieee80211_local, hw_roc_done); | |
231 | ||
232 | mutex_lock(&local->mtx); | |
233 | ||
234 | if (!local->hw_roc_channel) { | |
235 | mutex_unlock(&local->mtx); | |
236 | return; | |
237 | } | |
238 | ||
239 | cfg80211_remain_on_channel_expired(local->hw_roc_dev, | |
240 | local->hw_roc_cookie, | |
241 | local->hw_roc_channel, | |
242 | local->hw_roc_channel_type, | |
243 | GFP_KERNEL); | |
244 | ||
245 | local->hw_roc_channel = NULL; | |
246 | local->hw_roc_cookie = 0; | |
247 | ||
248 | ieee80211_recalc_idle(local); | |
249 | ||
250 | mutex_unlock(&local->mtx); | |
251 | } | |
252 | ||
253 | void ieee80211_remain_on_channel_expired(struct ieee80211_hw *hw) | |
254 | { | |
255 | struct ieee80211_local *local = hw_to_local(hw); | |
256 | ||
257 | trace_api_remain_on_channel_expired(local); | |
258 | ||
259 | ieee80211_queue_work(hw, &local->hw_roc_done); | |
260 | } | |
261 | EXPORT_SYMBOL_GPL(ieee80211_remain_on_channel_expired); | |
262 | ||
263 | void ieee80211_hw_roc_setup(struct ieee80211_local *local) | |
264 | { | |
265 | INIT_WORK(&local->hw_roc_start, ieee80211_hw_roc_start); | |
266 | INIT_WORK(&local->hw_roc_done, ieee80211_hw_roc_done); | |
267 | } |