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cfg80211: introduce cfg80211_get_chan_state 

Helper function for finding out which channel is
used by a given interface.

An exclusive channel can be used only by a single
interface. This is mainly for non-fixed channel
IBSS handling.

Signed-off-by: Michal Kazior <michal.kazior@tieto.com>
Signed-off-by: Johannes Berg <johannes.berg@intel.com>
This commit is contained in:
Michal Kazior 2012-06-29 12:47:00 +02:00 committed by Johannes Berg
parent c30a3d3868
commit 26ab9a0c58
2 changed files with 63 additions and 0 deletions
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51
net/wireless/chan.c
View File

@ -92,3 +92,54 @@ int cfg80211_set_monitor_channel(struct cfg80211_registered_device *rdev,
return rdev->ops->set_monitor_channel(&rdev->wiphy, chan, chantype);
}
void
cfg80211_get_chan_state(struct cfg80211_registered_device *rdev,
struct wireless_dev *wdev,
struct ieee80211_channel **chan,
enum cfg80211_chan_mode *chanmode)
{
*chan = NULL;
*chanmode = CHAN_MODE_UNDEFINED;
ASSERT_RDEV_LOCK(rdev);
ASSERT_WDEV_LOCK(wdev);
if (!netif_running(wdev->netdev))
return;
switch (wdev->iftype) {
case NL80211_IFTYPE_ADHOC:
if (wdev->current_bss) {
*chan = wdev->current_bss->pub.channel;
*chanmode = wdev->ibss_fixed
? CHAN_MODE_SHARED
: CHAN_MODE_EXCLUSIVE;
return;
}
case NL80211_IFTYPE_STATION:
case NL80211_IFTYPE_P2P_CLIENT:
if (wdev->current_bss) {
*chan = wdev->current_bss->pub.channel;
*chanmode = CHAN_MODE_SHARED;
return;
}
break;
case NL80211_IFTYPE_AP:
case NL80211_IFTYPE_P2P_GO:
case NL80211_IFTYPE_MESH_POINT:
*chan = wdev->channel;
*chanmode = CHAN_MODE_SHARED;
return;
case NL80211_IFTYPE_MONITOR:
case NL80211_IFTYPE_AP_VLAN:
case NL80211_IFTYPE_WDS:
/* these interface types don't really have a channel */
return;
case NL80211_IFTYPE_UNSPECIFIED:
case NUM_NL80211_IFTYPES:
WARN_ON(1);
}
return;
}

12
net/wireless/core.h
View File

@ -241,6 +241,12 @@ struct cfg80211_cached_keys {
int def, defmgmt;
};
enum cfg80211_chan_mode {
CHAN_MODE_UNDEFINED,
CHAN_MODE_SHARED,
CHAN_MODE_EXCLUSIVE,
};
/* free object */
extern void cfg80211_dev_free(struct cfg80211_registered_device *rdev);
@ -419,6 +425,12 @@ cfg80211_can_add_interface(struct cfg80211_registered_device *rdev,
return cfg80211_can_change_interface(rdev, NULL, iftype);
}
void
cfg80211_get_chan_state(struct cfg80211_registered_device *rdev,
struct wireless_dev *wdev,
struct ieee80211_channel **chan,
enum cfg80211_chan_mode *chanmode);
struct ieee80211_channel *
rdev_freq_to_chan(struct cfg80211_registered_device *rdev,
int freq, enum nl80211_channel_type channel_type);