Bluetooth: Make hci_send_to_sock usable for management control sockets

In order to send data to management control sockets the function should:

  - skip checks intended for raw HCI data and stack internal events
  - make sure RAW HCI data or stack internal events don't go to
    management control sockets

In order to accomplish this the patch adds a new member to the bluetooth
skb private data to flag skb's that are destined for management control
sockets.
Signed-off-by: Johan Hedberg <johan.hedberg@nokia.com>
Acked-by: Marcel Holtmann <marcel@holtmann.org>
Signed-off-by: Gustavo F. Padovan <padovan@profusion.mobi>

include/net/bluetooth/bluetooth.h

@@ -144,6 +144,7 @@ struct bt_skb_cb {
 	__u8 tx_seq;
 	__u8 retries;
 	__u8 sar;
+	unsigned short channel;
 };
 #define bt_cb(skb) ((struct bt_skb_cb *)((skb)->cb))
 

net/bluetooth/hci_sock.c

@@ -104,6 +104,12 @@ void hci_send_to_sock(struct hci_dev *hdev, struct sk_buff *skb)
 		if (skb->sk == sk)
 			continue;
 
+		if (bt_cb(skb)->channel != hci_pi(sk)->channel)
+			continue;
+
+		if (bt_cb(skb)->channel == HCI_CHANNEL_CONTROL)
+			goto clone;
+
 		/* Apply filter */
 		flt = &hci_pi(sk)->filter;
 
@@ -127,12 +133,14 @@ void hci_send_to_sock(struct hci_dev *hdev, struct sk_buff *skb)
 				continue;
 		}
 
+clone:
 		nskb = skb_clone(skb, GFP_ATOMIC);
 		if (!nskb)
 			continue;
 
 		/* Put type byte before the data */
-		memcpy(skb_push(nskb, 1), &bt_cb(nskb)->pkt_type, 1);
+		if (bt_cb(skb)->channel == HCI_CHANNEL_RAW)
+			memcpy(skb_push(nskb, 1), &bt_cb(nskb)->pkt_type, 1);
 
 		if (sock_queue_rcv_skb(sk, nskb))
 			kfree_skb(nskb);