Bluetooth: Add flags field and setting function for HCI sockets

To filter out certain actions for certain HCI sockets introcuce a flags
field that allows to configure specific settings on individual sockets.

Since the hci_pinfo structure is private in hci_sock.c, provide helper
functions for setting and clearing a given flag.
Signed-off-by: Marcel Holtmann <marcel@holtmann.org>
Signed-off-by: Johan Hedberg <johan.hedberg@intel.com>

include/net/bluetooth/bluetooth.h

@@ -335,6 +335,9 @@ static inline struct sk_buff *bt_skb_send_alloc(struct sock *sk,
 
 int bt_to_errno(__u16 code);
 
+void hci_sock_set_flag(struct sock *sk, int nr);
+void hci_sock_clear_flag(struct sock *sk, int nr);
+
 int hci_sock_init(void);
 void hci_sock_cleanup(void);
 

net/bluetooth/hci_sock.c

@@ -47,8 +47,19 @@ struct hci_pinfo {
 	struct hci_filter filter;
 	__u32             cmsg_mask;
 	unsigned short    channel;
+	unsigned long     flags;
 };
 
+void hci_sock_set_flag(struct sock *sk, int nr)
+{
+	set_bit(nr, &hci_pi(sk)->flags);
+}
+
+void hci_sock_clear_flag(struct sock *sk, int nr)
+{
+	clear_bit(nr, &hci_pi(sk)->flags);
+}
+
 static inline int hci_test_bit(int nr, const void *addr)
 {
 	return *((const __u32 *) addr + (nr >> 5)) & ((__u32) 1 << (nr & 31));