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[RFC 05/14] cfg80211: add channel tracking for AP and mesh

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We need to know which channel is used by a running
AP and mesh for channel context accounting and
finding matching/active interface combination.

STA/IBSS have current_bss already which allows us
to check which channel a vif is tuned to.

Monitor mode is going to be handled differently.

Change-Id: I693f58c51aef1f814edb5451ca8b701eb6d65377
Signed-off-by: Michal Kazior <michal.kazior@xxxxxxxxx>
---
 include/net/cfg80211.h |    3 +++
 net/wireless/ap.c      |    4 +++-
 net/wireless/mesh.c    |    6 +++++-
 net/wireless/nl80211.c |    5 ++++-
 4 files changed, 15 insertions(+), 3 deletions(-)

diff --git a/include/net/cfg80211.h b/include/net/cfg80211.h
index 7319f25..0f9d7b4 100644
--- a/include/net/cfg80211.h
+++ b/include/net/cfg80211.h
@@ -2335,6 +2335,9 @@ struct wireless_dev {
 	struct ieee80211_channel *preset_chan;
 	enum nl80211_channel_type preset_chantype;
 
+	/* for AP and mesh channel tracking */
+	struct ieee80211_channel *channel;
+
 	bool ps;
 	int ps_timeout;
 
diff --git a/net/wireless/ap.c b/net/wireless/ap.c
index 45199cc..fcc60d8 100644
--- a/net/wireless/ap.c
+++ b/net/wireless/ap.c
@@ -24,8 +24,10 @@ static int __cfg80211_stop_ap(struct cfg80211_registered_device *rdev,
 		return -ENOENT;
 
 	err = rdev->ops->stop_ap(&rdev->wiphy, dev);
-	if (!err)
+	if (!err) {
 		wdev->beacon_interval = 0;
+		wdev->channel = NULL;
+	}
 
 	return err;
 }
diff --git a/net/wireless/mesh.c b/net/wireless/mesh.c
index b44c736..c9c38e3 100644
--- a/net/wireless/mesh.c
+++ b/net/wireless/mesh.c
@@ -153,6 +153,7 @@ int __cfg80211_join_mesh(struct cfg80211_registered_device *rdev,
 	if (!err) {
 		memcpy(wdev->ssid, setup->mesh_id, setup->mesh_id_len);
 		wdev->mesh_id_len = setup->mesh_id_len;
+		wdev->channel = setup->channel;
 	}
 
 	return err;
@@ -243,8 +244,11 @@ static int __cfg80211_leave_mesh(struct cfg80211_registered_device *rdev,
 		return -ENOTCONN;
 
 	err = rdev->ops->leave_mesh(&rdev->wiphy, dev);
-	if (!err)
+	if (!err) {
 		wdev->mesh_id_len = 0;
+		wdev->channel = NULL;
+	}
+
 	return err;
 }
 
diff --git a/net/wireless/nl80211.c b/net/wireless/nl80211.c
index e28c74a..7486653 100644
--- a/net/wireless/nl80211.c
+++ b/net/wireless/nl80211.c
@@ -2356,8 +2356,11 @@ static int nl80211_start_ap(struct sk_buff *skb, struct genl_info *info)
 		return -EINVAL;
 
 	err = rdev->ops->start_ap(&rdev->wiphy, dev, &params);
-	if (!err)
+	if (!err) {
 		wdev->beacon_interval = params.beacon_interval;
+		wdev->channel = params.channel;
+	}
+
 	return err;
 }
 
-- 
1.7.0.4

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