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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; | |
4730d597 | 25 | struct ieee80211_if_managed *ifmgd = &sdata->u.mgd; |
b203ffc3 JM |
26 | |
27 | local->offchannel_ps_enabled = false; | |
28 | ||
29 | /* FIXME: what to do when local->pspolling is true? */ | |
30 | ||
31 | del_timer_sync(&local->dynamic_ps_timer); | |
3bc3c0d7 | 32 | del_timer_sync(&ifmgd->bcn_mon_timer); |
4730d597 LR |
33 | del_timer_sync(&ifmgd->conn_mon_timer); |
34 | ||
b203ffc3 JM |
35 | cancel_work_sync(&local->dynamic_ps_enable_work); |
36 | ||
37 | if (local->hw.conf.flags & IEEE80211_CONF_PS) { | |
38 | local->offchannel_ps_enabled = true; | |
39 | local->hw.conf.flags &= ~IEEE80211_CONF_PS; | |
40 | ieee80211_hw_config(local, IEEE80211_CONF_CHANGE_PS); | |
41 | } | |
42 | ||
43 | if (!(local->offchannel_ps_enabled) || | |
44 | !(local->hw.flags & IEEE80211_HW_PS_NULLFUNC_STACK)) | |
45 | /* | |
46 | * If power save was enabled, no need to send a nullfunc | |
47 | * frame because AP knows that we are sleeping. But if the | |
48 | * hardware is creating the nullfunc frame for power save | |
49 | * status (ie. IEEE80211_HW_PS_NULLFUNC_STACK is not | |
50 | * enabled) and power save was enabled, the firmware just | |
51 | * sent a null frame with power save disabled. So we need | |
52 | * to send a new nullfunc frame to inform the AP that we | |
53 | * are again sleeping. | |
54 | */ | |
55 | ieee80211_send_nullfunc(local, sdata, 1); | |
56 | } | |
57 | ||
58 | /* inform AP that we are awake again, unless power save is enabled */ | |
59 | static void ieee80211_offchannel_ps_disable(struct ieee80211_sub_if_data *sdata) | |
60 | { | |
61 | struct ieee80211_local *local = sdata->local; | |
62 | ||
63 | if (!local->ps_sdata) | |
64 | ieee80211_send_nullfunc(local, sdata, 0); | |
65 | else if (local->offchannel_ps_enabled) { | |
66 | /* | |
67 | * In !IEEE80211_HW_PS_NULLFUNC_STACK case the hardware | |
68 | * will send a nullfunc frame with the powersave bit set | |
69 | * even though the AP already knows that we are sleeping. | |
70 | * This could be avoided by sending a null frame with power | |
71 | * save bit disabled before enabling the power save, but | |
72 | * this doesn't gain anything. | |
73 | * | |
74 | * When IEEE80211_HW_PS_NULLFUNC_STACK is enabled, no need | |
75 | * to send a nullfunc frame because AP already knows that | |
76 | * we are sleeping, let's just enable power save mode in | |
77 | * hardware. | |
78 | */ | |
79 | local->hw.conf.flags |= IEEE80211_CONF_PS; | |
80 | ieee80211_hw_config(local, IEEE80211_CONF_CHANGE_PS); | |
81 | } else if (local->hw.conf.dynamic_ps_timeout > 0) { | |
82 | /* | |
83 | * If IEEE80211_CONF_PS was not set and the dynamic_ps_timer | |
84 | * had been running before leaving the operating channel, | |
85 | * restart the timer now and send a nullfunc frame to inform | |
86 | * the AP that we are awake. | |
87 | */ | |
88 | ieee80211_send_nullfunc(local, sdata, 0); | |
89 | mod_timer(&local->dynamic_ps_timer, jiffies + | |
90 | msecs_to_jiffies(local->hw.conf.dynamic_ps_timeout)); | |
91 | } | |
4730d597 | 92 | |
3bc3c0d7 | 93 | ieee80211_sta_reset_beacon_monitor(sdata); |
4730d597 | 94 | ieee80211_sta_reset_conn_monitor(sdata); |
b203ffc3 JM |
95 | } |
96 | ||
97 | void ieee80211_offchannel_stop_beaconing(struct ieee80211_local *local) | |
98 | { | |
99 | struct ieee80211_sub_if_data *sdata; | |
100 | ||
101 | mutex_lock(&local->iflist_mtx); | |
102 | list_for_each_entry(sdata, &local->interfaces, list) { | |
103 | if (!ieee80211_sdata_running(sdata)) | |
104 | continue; | |
105 | ||
106 | /* disable beaconing */ | |
107 | if (sdata->vif.type == NL80211_IFTYPE_AP || | |
108 | sdata->vif.type == NL80211_IFTYPE_ADHOC || | |
109 | sdata->vif.type == NL80211_IFTYPE_MESH_POINT) | |
110 | ieee80211_bss_info_change_notify( | |
111 | sdata, BSS_CHANGED_BEACON_ENABLED); | |
112 | ||
113 | /* | |
114 | * only handle non-STA interfaces here, STA interfaces | |
115 | * are handled in ieee80211_offchannel_stop_station(), | |
b8bc4b0a JB |
116 | * e.g., from the background scan state machine. |
117 | * | |
118 | * In addition, do not stop monitor interface to allow it to be | |
119 | * used from user space controlled off-channel operations. | |
b203ffc3 | 120 | */ |
b8bc4b0a | 121 | if (sdata->vif.type != NL80211_IFTYPE_STATION && |
5b714c6a JB |
122 | sdata->vif.type != NL80211_IFTYPE_MONITOR) { |
123 | set_bit(SDATA_STATE_OFFCHANNEL, &sdata->state); | |
cfa6cb20 | 124 | netif_tx_stop_all_queues(sdata->dev); |
5b714c6a | 125 | } |
b203ffc3 JM |
126 | } |
127 | mutex_unlock(&local->iflist_mtx); | |
128 | } | |
129 | ||
130 | void ieee80211_offchannel_stop_station(struct ieee80211_local *local) | |
131 | { | |
132 | struct ieee80211_sub_if_data *sdata; | |
133 | ||
134 | /* | |
135 | * notify the AP about us leaving the channel and stop all STA interfaces | |
136 | */ | |
137 | mutex_lock(&local->iflist_mtx); | |
138 | list_for_each_entry(sdata, &local->interfaces, list) { | |
139 | if (!ieee80211_sdata_running(sdata)) | |
140 | continue; | |
141 | ||
142 | if (sdata->vif.type == NL80211_IFTYPE_STATION) { | |
5b714c6a | 143 | set_bit(SDATA_STATE_OFFCHANNEL, &sdata->state); |
cfa6cb20 | 144 | netif_tx_stop_all_queues(sdata->dev); |
b203ffc3 JM |
145 | if (sdata->u.mgd.associated) |
146 | ieee80211_offchannel_ps_enable(sdata); | |
147 | } | |
148 | } | |
149 | mutex_unlock(&local->iflist_mtx); | |
150 | } | |
151 | ||
152 | void ieee80211_offchannel_return(struct ieee80211_local *local, | |
153 | bool enable_beaconing) | |
154 | { | |
155 | struct ieee80211_sub_if_data *sdata; | |
156 | ||
157 | mutex_lock(&local->iflist_mtx); | |
158 | list_for_each_entry(sdata, &local->interfaces, list) { | |
159 | if (!ieee80211_sdata_running(sdata)) | |
160 | continue; | |
161 | ||
162 | /* Tell AP we're back */ | |
163 | if (sdata->vif.type == NL80211_IFTYPE_STATION) { | |
164 | if (sdata->u.mgd.associated) | |
165 | ieee80211_offchannel_ps_disable(sdata); | |
b203ffc3 JM |
166 | } |
167 | ||
5b714c6a JB |
168 | if (sdata->vif.type != NL80211_IFTYPE_MONITOR) { |
169 | clear_bit(SDATA_STATE_OFFCHANNEL, &sdata->state); | |
170 | /* | |
171 | * This may wake up queues even though the driver | |
172 | * currently has them stopped. This is not very | |
173 | * likely, since the driver won't have gotten any | |
174 | * (or hardly any) new packets while we weren't | |
175 | * on the right channel, and even if it happens | |
176 | * it will at most lead to queueing up one more | |
177 | * packet per queue in mac80211 rather than on | |
178 | * the interface qdisc. | |
179 | */ | |
93895757 | 180 | netif_tx_wake_all_queues(sdata->dev); |
5b714c6a | 181 | } |
93895757 | 182 | |
b203ffc3 JM |
183 | /* re-enable beaconing */ |
184 | if (enable_beaconing && | |
185 | (sdata->vif.type == NL80211_IFTYPE_AP || | |
186 | sdata->vif.type == NL80211_IFTYPE_ADHOC || | |
187 | sdata->vif.type == NL80211_IFTYPE_MESH_POINT)) | |
188 | ieee80211_bss_info_change_notify( | |
189 | sdata, BSS_CHANGED_BEACON_ENABLED); | |
190 | } | |
191 | mutex_unlock(&local->iflist_mtx); | |
192 | } |