2 * This file contains helper code to handle channel
3 * settings and keeping track of what is possible at
6 * Copyright 2009 Johannes Berg <johannes@sipsolutions.net>
9 #include <linux/export.h>
10 #include <net/cfg80211.h>
13 struct ieee80211_channel
*
14 rdev_freq_to_chan(struct cfg80211_registered_device
*rdev
,
15 int freq
, enum nl80211_channel_type channel_type
)
17 struct ieee80211_channel
*chan
;
18 struct ieee80211_sta_ht_cap
*ht_cap
;
20 chan
= ieee80211_get_channel(&rdev
->wiphy
, freq
);
22 /* Primary channel not allowed */
23 if (!chan
|| chan
->flags
& IEEE80211_CHAN_DISABLED
)
26 if (channel_type
== NL80211_CHAN_HT40MINUS
&&
27 chan
->flags
& IEEE80211_CHAN_NO_HT40MINUS
)
29 else if (channel_type
== NL80211_CHAN_HT40PLUS
&&
30 chan
->flags
& IEEE80211_CHAN_NO_HT40PLUS
)
33 ht_cap
= &rdev
->wiphy
.bands
[chan
->band
]->ht_cap
;
35 if (channel_type
!= NL80211_CHAN_NO_HT
) {
36 if (!ht_cap
->ht_supported
)
39 if (channel_type
!= NL80211_CHAN_HT20
&&
40 (!(ht_cap
->cap
& IEEE80211_HT_CAP_SUP_WIDTH_20_40
) ||
41 ht_cap
->cap
& IEEE80211_HT_CAP_40MHZ_INTOLERANT
))
48 bool cfg80211_can_beacon_sec_chan(struct wiphy
*wiphy
,
49 struct ieee80211_channel
*chan
,
50 enum nl80211_channel_type channel_type
)
52 struct ieee80211_channel
*sec_chan
;
55 switch (channel_type
) {
56 case NL80211_CHAN_HT40PLUS
:
59 case NL80211_CHAN_HT40MINUS
:
66 sec_chan
= ieee80211_get_channel(wiphy
, chan
->center_freq
+ diff
);
70 /* we'll need a DFS capability later */
71 if (sec_chan
->flags
& (IEEE80211_CHAN_DISABLED
|
72 IEEE80211_CHAN_PASSIVE_SCAN
|
73 IEEE80211_CHAN_NO_IBSS
|
74 IEEE80211_CHAN_RADAR
))
79 EXPORT_SYMBOL(cfg80211_can_beacon_sec_chan
);
81 int cfg80211_set_monitor_channel(struct cfg80211_registered_device
*rdev
,
82 int freq
, enum nl80211_channel_type chantype
)
84 struct ieee80211_channel
*chan
;
86 if (!rdev
->ops
->set_monitor_channel
)
88 if (!cfg80211_has_monitors_only(rdev
))
91 chan
= rdev_freq_to_chan(rdev
, freq
, chantype
);
95 return rdev
->ops
->set_monitor_channel(&rdev
->wiphy
, chan
, chantype
);
99 cfg80211_get_chan_state(struct wireless_dev
*wdev
,
100 struct ieee80211_channel
**chan
,
101 enum cfg80211_chan_mode
*chanmode
)
104 *chanmode
= CHAN_MODE_UNDEFINED
;
106 ASSERT_WDEV_LOCK(wdev
);
108 if (wdev
->netdev
&& !netif_running(wdev
->netdev
))
111 switch (wdev
->iftype
) {
112 case NL80211_IFTYPE_ADHOC
:
113 if (wdev
->current_bss
) {
114 *chan
= wdev
->current_bss
->pub
.channel
;
115 *chanmode
= wdev
->ibss_fixed
117 : CHAN_MODE_EXCLUSIVE
;
120 case NL80211_IFTYPE_STATION
:
121 case NL80211_IFTYPE_P2P_CLIENT
:
122 if (wdev
->current_bss
) {
123 *chan
= wdev
->current_bss
->pub
.channel
;
124 *chanmode
= CHAN_MODE_SHARED
;
128 case NL80211_IFTYPE_AP
:
129 case NL80211_IFTYPE_P2P_GO
:
130 if (wdev
->beacon_interval
) {
131 *chan
= wdev
->channel
;
132 *chanmode
= CHAN_MODE_SHARED
;
135 case NL80211_IFTYPE_MESH_POINT
:
136 if (wdev
->mesh_id_len
) {
137 *chan
= wdev
->channel
;
138 *chanmode
= CHAN_MODE_SHARED
;
141 case NL80211_IFTYPE_MONITOR
:
142 case NL80211_IFTYPE_AP_VLAN
:
143 case NL80211_IFTYPE_WDS
:
144 /* these interface types don't really have a channel */
146 case NL80211_IFTYPE_P2P_DEVICE
:
147 if (wdev
->wiphy
->features
&
148 NL80211_FEATURE_P2P_DEVICE_NEEDS_CHANNEL
)
149 *chanmode
= CHAN_MODE_EXCLUSIVE
;
151 case NL80211_IFTYPE_UNSPECIFIED
:
152 case NUM_NL80211_IFTYPES
: