Bluetooth: Add support for returning the encryption key size

This will be useful when userspace wants to restrict some kinds of
operations based on the length of the key size used to encrypt the
link.

Signed-off-by: Vinicius Costa Gomes <vinicius.gomes@openbossa.org>
Signed-off-by: Gustavo F. Padovan <padovan@profusion.mobi>

1 files changed, 4 insertions, 0 deletions

diff --git a/net/bluetooth/l2cap_sock.c b/net/bluetooth/l2cap_sock.c
index 146b614d10ed..5c36b3e8739c 100644
--- a/net/bluetooth/l2cap_sock.c
+++ b/net/bluetooth/l2cap_sock.c
@@ -422,8 +422,12 @@ static int l2cap_sock_getsockopt(struct socket *sock, int level, int optname, ch
                         break;
                 }
 
+                memset(&sec, 0, sizeof(sec));
                 sec.level = chan->sec_level;
 
+                if (sk->sk_state == BT_CONNECTED)
+                        sec.key_size = chan->conn->hcon->enc_key_size;
+
                 len = min_t(unsigned int, len, sizeof(sec));
                 if (copy_to_user(optval, (char *) &sec, len))
                         err = -EFAULT;