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cfg80211: add channel switch started notification

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Add a new NL80211_CH_SWITCH_STARTED_NOTIFY message that can be sent to
the userspace when a channel switch process has started.  This allows
userspace to take action, for instance, by requesting other interfaces
to switch channel as necessary.

This patch introduces a function that allows the drivers to send this
notification.  It should be used when the driver starts processing a
channel switch initiated by a remote device (eg. when a STA receives a
CSA from the AP) and when it successfully starts a userspace-triggered
channel switch (eg. when hostapd triggers a channel swith in the AP).

Signed-off-by: Luciano Coelho <luciano.coelho@intel.com>
Signed-off-by: Johannes Berg <johannes.berg@intel.com>
This commit is contained in:
Luciano Coelho
2014-11-07 14:31:35 +02:00
committed by Johannes Berg
parent 127f10ec60
commit f8d7552e94
4 changed files with 66 additions and 3 deletions
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11
include/uapi/linux/nl80211.h
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@@ -645,6 +645,15 @@
* %NL80211_ATTR_IFINDEX is now on %NL80211_ATTR_WIPHY_FREQ and the
* attributes determining channel width.
*
* @NL80211_CMD_CH_SWITCH_STARTED_NOTIFY: Notify that a channel switch
* has been started on an interface, regardless of the initiator
* (ie. whether it was requested from a remote device or
* initiated on our own). It indicates that
* %NL80211_ATTR_IFINDEX will be on %NL80211_ATTR_WIPHY_FREQ
* after %NL80211_ATTR_CH_SWITCH_COUNT TBTT's. The userspace may
* decide to react to this indication by requesting other
* interfaces to change channel as well.
*
* @NL80211_CMD_START_P2P_DEVICE: Start the given P2P Device, identified by
* its %NL80211_ATTR_WDEV identifier. It must have been created with
* %NL80211_CMD_NEW_INTERFACE previously. After it has been started, the
@@ -930,6 +939,8 @@ enum nl80211_commands {
NL80211_CMD_JOIN_OCB,
NL80211_CMD_LEAVE_OCB,
NL80211_CMD_CH_SWITCH_STARTED_NOTIFY,
/* add new commands above here */
/* used to define NL80211_CMD_MAX below */