cfg80211/mac80211: make ieee80211_send_layer2_update a public function

commit 30ca1aa536211f5ac3de0173513a7a99a98a97f3 upstream.

Make ieee80211_send_layer2_update() a common function so other drivers
can re-use it.

Signed-off-by: Dedy Lansky <dlansky@codeaurora.org>
Signed-off-by: Johannes Berg <johannes.berg@intel.com>
[bwh: Backported to 4.4 as dependency of commit 3e493173b784
 "mac80211: Do not send Layer 2 Update frame before authorization":
 - Retain type-casting of skb_put() return value
 - Adjust context]
Signed-off-by: Ben Hutchings <ben.hutchings@codethink.co.uk>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

1 files changed, 2 insertions, 46 deletions

diff --git a/net/mac80211/cfg.c b/net/mac80211/cfg.c
index 1999a7eaa692..0b8ce846bd73 100644
--- a/net/mac80211/cfg.c
+++ b/net/mac80211/cfg.c
@@ -875,50 +875,6 @@ static int ieee80211_stop_ap(struct wiphy *wiphy, struct net_device *dev)
 	return 0;
 }
 
-/* Layer 2 Update frame (802.2 Type 1 LLC XID Update response) */
-struct iapp_layer2_update {
-	u8 da[ETH_ALEN];	/* broadcast */
-	u8 sa[ETH_ALEN];	/* STA addr */
-	__be16 len;		/* 6 */
-	u8 dsap;		/* 0 */
-	u8 ssap;		/* 0 */
-	u8 control;
-	u8 xid_info[3];
-} __packed;
-
-static void ieee80211_send_layer2_update(struct sta_info *sta)
-{
-	struct iapp_layer2_update *msg;
-	struct sk_buff *skb;
-
-	/* Send Level 2 Update Frame to update forwarding tables in layer 2
-	 * bridge devices */
-
-	skb = dev_alloc_skb(sizeof(*msg));
-	if (!skb)
-		return;
-	msg = (struct iapp_layer2_update *)skb_put(skb, sizeof(*msg));
-
-	/* 802.2 Type 1 Logical Link Control (LLC) Exchange Identifier (XID)
-	 * Update response frame; IEEE Std 802.2-1998, 5.4.1.2.1 */
-
-	eth_broadcast_addr(msg->da);
-	memcpy(msg->sa, sta->sta.addr, ETH_ALEN);
-	msg->len = htons(6);
-	msg->dsap = 0;
-	msg->ssap = 0x01;	/* NULL LSAP, CR Bit: Response */
-	msg->control = 0xaf;	/* XID response lsb.1111F101.
-				 * F=0 (no poll command; unsolicited frame) */
-	msg->xid_info[0] = 0x81;	/* XID format identifier */
-	msg->xid_info[1] = 1;	/* LLC types/classes: Type 1 LLC */
-	msg->xid_info[2] = 0;	/* XID sender's receive window size (RW) */
-
-	skb->dev = sta->sdata->dev;
-	skb->protocol = eth_type_trans(skb, sta->sdata->dev);
-	memset(skb->cb, 0, sizeof(skb->cb));
-	netif_rx_ni(skb);
-}
-
 static int sta_apply_auth_flags(struct ieee80211_local *local,
 				struct sta_info *sta,
 				u32 mask, u32 set)
@@ -1258,7 +1214,7 @@ static int ieee80211_add_station(struct wiphy *wiphy, struct net_device *dev,
 	}
 
 	if (layer2_update)
-		ieee80211_send_layer2_update(sta);
+		cfg80211_send_layer2_update(sta->sdata->dev, sta->sta.addr);
 
 	rcu_read_unlock();
 
@@ -1367,7 +1323,7 @@ static int ieee80211_change_station(struct wiphy *wiphy,
 				atomic_inc(&sta->sdata->bss->num_mcast_sta);
 		}
 
-		ieee80211_send_layer2_update(sta);
+		cfg80211_send_layer2_update(sta->sdata->dev, sta->sta.addr);
 	}
 
 	err = sta_apply_parameters(local, sta, params);