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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" | |
17 | ||
18 | /* | |
19 | * inform AP that we will go to sleep so that it will buffer the frames | |
20 | * while we scan | |
21 | */ | |
22 | static void ieee80211_offchannel_ps_enable(struct ieee80211_sub_if_data *sdata) | |
23 | { | |
24 | struct ieee80211_local *local = sdata->local; | |
25 | ||
26 | local->offchannel_ps_enabled = false; | |
27 | ||
28 | /* FIXME: what to do when local->pspolling is true? */ | |
29 | ||
30 | del_timer_sync(&local->dynamic_ps_timer); | |
31 | cancel_work_sync(&local->dynamic_ps_enable_work); | |
32 | ||
33 | if (local->hw.conf.flags & IEEE80211_CONF_PS) { | |
34 | local->offchannel_ps_enabled = true; | |
35 | local->hw.conf.flags &= ~IEEE80211_CONF_PS; | |
36 | ieee80211_hw_config(local, IEEE80211_CONF_CHANGE_PS); | |
37 | } | |
38 | ||
39 | if (!(local->offchannel_ps_enabled) || | |
40 | !(local->hw.flags & IEEE80211_HW_PS_NULLFUNC_STACK)) | |
41 | /* | |
42 | * If power save was enabled, no need to send a nullfunc | |
43 | * frame because AP knows that we are sleeping. But if the | |
44 | * hardware is creating the nullfunc frame for power save | |
45 | * status (ie. IEEE80211_HW_PS_NULLFUNC_STACK is not | |
46 | * enabled) and power save was enabled, the firmware just | |
47 | * sent a null frame with power save disabled. So we need | |
48 | * to send a new nullfunc frame to inform the AP that we | |
49 | * are again sleeping. | |
50 | */ | |
51 | ieee80211_send_nullfunc(local, sdata, 1); | |
52 | } | |
53 | ||
54 | /* inform AP that we are awake again, unless power save is enabled */ | |
55 | static void ieee80211_offchannel_ps_disable(struct ieee80211_sub_if_data *sdata) | |
56 | { | |
57 | struct ieee80211_local *local = sdata->local; | |
58 | ||
59 | if (!local->ps_sdata) | |
60 | ieee80211_send_nullfunc(local, sdata, 0); | |
61 | else if (local->offchannel_ps_enabled) { | |
62 | /* | |
63 | * In !IEEE80211_HW_PS_NULLFUNC_STACK case the hardware | |
64 | * will send a nullfunc frame with the powersave bit set | |
65 | * even though the AP already knows that we are sleeping. | |
66 | * This could be avoided by sending a null frame with power | |
67 | * save bit disabled before enabling the power save, but | |
68 | * this doesn't gain anything. | |
69 | * | |
70 | * When IEEE80211_HW_PS_NULLFUNC_STACK is enabled, no need | |
71 | * to send a nullfunc frame because AP already knows that | |
72 | * we are sleeping, let's just enable power save mode in | |
73 | * hardware. | |
74 | */ | |
75 | local->hw.conf.flags |= IEEE80211_CONF_PS; | |
76 | ieee80211_hw_config(local, IEEE80211_CONF_CHANGE_PS); | |
77 | } else if (local->hw.conf.dynamic_ps_timeout > 0) { | |
78 | /* | |
79 | * If IEEE80211_CONF_PS was not set and the dynamic_ps_timer | |
80 | * had been running before leaving the operating channel, | |
81 | * restart the timer now and send a nullfunc frame to inform | |
82 | * the AP that we are awake. | |
83 | */ | |
84 | ieee80211_send_nullfunc(local, sdata, 0); | |
85 | mod_timer(&local->dynamic_ps_timer, jiffies + | |
86 | msecs_to_jiffies(local->hw.conf.dynamic_ps_timeout)); | |
87 | } | |
88 | } | |
89 | ||
90 | void ieee80211_offchannel_stop_beaconing(struct ieee80211_local *local) | |
91 | { | |
92 | struct ieee80211_sub_if_data *sdata; | |
93 | ||
94 | mutex_lock(&local->iflist_mtx); | |
95 | list_for_each_entry(sdata, &local->interfaces, list) { | |
96 | if (!ieee80211_sdata_running(sdata)) | |
97 | continue; | |
98 | ||
99 | /* disable beaconing */ | |
100 | if (sdata->vif.type == NL80211_IFTYPE_AP || | |
101 | sdata->vif.type == NL80211_IFTYPE_ADHOC || | |
102 | sdata->vif.type == NL80211_IFTYPE_MESH_POINT) | |
103 | ieee80211_bss_info_change_notify( | |
104 | sdata, BSS_CHANGED_BEACON_ENABLED); | |
105 | ||
106 | /* | |
107 | * only handle non-STA interfaces here, STA interfaces | |
108 | * are handled in ieee80211_offchannel_stop_station(), | |
b8bc4b0a JB |
109 | * e.g., from the background scan state machine. |
110 | * | |
111 | * In addition, do not stop monitor interface to allow it to be | |
112 | * used from user space controlled off-channel operations. | |
b203ffc3 | 113 | */ |
b8bc4b0a JB |
114 | if (sdata->vif.type != NL80211_IFTYPE_STATION && |
115 | sdata->vif.type != NL80211_IFTYPE_MONITOR) | |
cfa6cb20 | 116 | netif_tx_stop_all_queues(sdata->dev); |
b203ffc3 JM |
117 | } |
118 | mutex_unlock(&local->iflist_mtx); | |
119 | } | |
120 | ||
121 | void ieee80211_offchannel_stop_station(struct ieee80211_local *local) | |
122 | { | |
123 | struct ieee80211_sub_if_data *sdata; | |
124 | ||
125 | /* | |
126 | * notify the AP about us leaving the channel and stop all STA interfaces | |
127 | */ | |
128 | mutex_lock(&local->iflist_mtx); | |
129 | list_for_each_entry(sdata, &local->interfaces, list) { | |
130 | if (!ieee80211_sdata_running(sdata)) | |
131 | continue; | |
132 | ||
133 | if (sdata->vif.type == NL80211_IFTYPE_STATION) { | |
cfa6cb20 | 134 | netif_tx_stop_all_queues(sdata->dev); |
b203ffc3 JM |
135 | if (sdata->u.mgd.associated) |
136 | ieee80211_offchannel_ps_enable(sdata); | |
137 | } | |
138 | } | |
139 | mutex_unlock(&local->iflist_mtx); | |
140 | } | |
141 | ||
142 | void ieee80211_offchannel_return(struct ieee80211_local *local, | |
143 | bool enable_beaconing) | |
144 | { | |
145 | struct ieee80211_sub_if_data *sdata; | |
146 | ||
147 | mutex_lock(&local->iflist_mtx); | |
148 | list_for_each_entry(sdata, &local->interfaces, list) { | |
149 | if (!ieee80211_sdata_running(sdata)) | |
150 | continue; | |
151 | ||
152 | /* Tell AP we're back */ | |
153 | if (sdata->vif.type == NL80211_IFTYPE_STATION) { | |
154 | if (sdata->u.mgd.associated) | |
155 | ieee80211_offchannel_ps_disable(sdata); | |
b203ffc3 JM |
156 | } |
157 | ||
93895757 BP |
158 | if (sdata->vif.type != NL80211_IFTYPE_MONITOR) |
159 | netif_tx_wake_all_queues(sdata->dev); | |
160 | ||
b203ffc3 JM |
161 | /* re-enable beaconing */ |
162 | if (enable_beaconing && | |
163 | (sdata->vif.type == NL80211_IFTYPE_AP || | |
164 | sdata->vif.type == NL80211_IFTYPE_ADHOC || | |
165 | sdata->vif.type == NL80211_IFTYPE_MESH_POINT)) | |
166 | ieee80211_bss_info_change_notify( | |
167 | sdata, BSS_CHANGED_BEACON_ENABLED); | |
168 | } | |
169 | mutex_unlock(&local->iflist_mtx); | |
170 | } |