Bluetooth: Create a unified auth_type evaluation function

The logic for determining the needed auth_type for an L2CAP socket is
rather complicated and has so far been duplicated in
l2cap_check_security as well as l2cap_do_connect. Additionally the
l2cap_check_security code was completely missing the handling of
SOCK_RAW type sockets. This patch creates a unified function for the
evaluation and makes l2cap_do_connect and l2cap_check_security use that
function.

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>

diff --git a/net/bluetooth/l2cap.c b/net/bluetooth/l2cap.c
index 4fd88eb..ae227bf 100644 (file)
--- a/net/bluetooth/l2cap.c
+++ b/net/bluetooth/l2cap.c
@@ -305,33 +305,44 @@ static void l2cap_chan_del(struct sock *sk, int err)
        }
 }
 
-/* Service level security */
-static inline int l2cap_check_security(struct sock *sk)
+static inline u8 l2cap_get_auth_type(struct sock *sk)
 {
-       struct l2cap_conn *conn = l2cap_pi(sk)->conn;
-       __u8 auth_type;
+       if (sk->sk_type == SOCK_RAW) {
+               switch (l2cap_pi(sk)->sec_level) {
+               case BT_SECURITY_HIGH:
+                       return HCI_AT_DEDICATED_BONDING_MITM;
+               case BT_SECURITY_MEDIUM:
+                       return HCI_AT_DEDICATED_BONDING;
+               default:
+                       return HCI_AT_NO_BONDING;
+               }
+       } else if (l2cap_pi(sk)->psm == cpu_to_le16(0x0001)) {
+               if (l2cap_pi(sk)->sec_level == BT_SECURITY_LOW)
+                       l2cap_pi(sk)->sec_level = BT_SECURITY_SDP;
 
-       if (l2cap_pi(sk)->psm == cpu_to_le16(0x0001)) {
                if (l2cap_pi(sk)->sec_level == BT_SECURITY_HIGH)
-                       auth_type = HCI_AT_NO_BONDING_MITM;
+                       return HCI_AT_NO_BONDING_MITM;
                else
-                       auth_type = HCI_AT_NO_BONDING;
-
-               if (l2cap_pi(sk)->sec_level == BT_SECURITY_LOW)
-                       l2cap_pi(sk)->sec_level = BT_SECURITY_SDP;
+                       return HCI_AT_NO_BONDING;
        } else {
                switch (l2cap_pi(sk)->sec_level) {
                case BT_SECURITY_HIGH:
-                       auth_type = HCI_AT_GENERAL_BONDING_MITM;
-                       break;
+                       return HCI_AT_GENERAL_BONDING_MITM;
                case BT_SECURITY_MEDIUM:
-                       auth_type = HCI_AT_GENERAL_BONDING;
-                       break;
+                       return HCI_AT_GENERAL_BONDING;
                default:
-                       auth_type = HCI_AT_NO_BONDING;
-                       break;
+                       return HCI_AT_NO_BONDING;
                }
        }
+}
+
+/* Service level security */
+static inline int l2cap_check_security(struct sock *sk)
+{
+       struct l2cap_conn *conn = l2cap_pi(sk)->conn;
+       __u8 auth_type;
+
+       auth_type = l2cap_get_auth_type(sk);
 
        return hci_conn_security(conn->hcon, l2cap_pi(sk)->sec_level,
                                                                auth_type);
@@ -1068,39 +1079,7 @@ static int l2cap_do_connect(struct sock *sk)
 
        err = -ENOMEM;
 
-       if (sk->sk_type == SOCK_RAW) {
-               switch (l2cap_pi(sk)->sec_level) {
-               case BT_SECURITY_HIGH:
-                       auth_type = HCI_AT_DEDICATED_BONDING_MITM;
-                       break;
-               case BT_SECURITY_MEDIUM:
-                       auth_type = HCI_AT_DEDICATED_BONDING;
-                       break;
-               default:
-                       auth_type = HCI_AT_NO_BONDING;
-                       break;
-               }
-       } else if (l2cap_pi(sk)->psm == cpu_to_le16(0x0001)) {
-               if (l2cap_pi(sk)->sec_level == BT_SECURITY_HIGH)
-                       auth_type = HCI_AT_NO_BONDING_MITM;
-               else
-                       auth_type = HCI_AT_NO_BONDING;
-
-               if (l2cap_pi(sk)->sec_level == BT_SECURITY_LOW)
-                       l2cap_pi(sk)->sec_level = BT_SECURITY_SDP;
-       } else {
-               switch (l2cap_pi(sk)->sec_level) {
-               case BT_SECURITY_HIGH:
-                       auth_type = HCI_AT_GENERAL_BONDING_MITM;
-                       break;
-               case BT_SECURITY_MEDIUM:
-                       auth_type = HCI_AT_GENERAL_BONDING;
-                       break;
-               default:
-                       auth_type = HCI_AT_NO_BONDING;
-                       break;
-               }
-       }
+       auth_type = l2cap_get_auth_type(sk);
 
        hcon = hci_connect(hdev, ACL_LINK, dst,
                                        l2cap_pi(sk)->sec_level, auth_type);