Bluetooth: Add support for connect failed management event

This patch add a new connect failed management event to track failures
in connecting to remote devices. It is particularly useful for security
mode 3 scenarios when we don't have a connected state while pairing but
still need to detect when the connect attempt failed.
Signed-off-by: Johan Hedberg <johan.hedberg@nokia.com>
Signed-off-by: Gustavo F. Padovan <padovan@profusion.mobi>

include/net/bluetooth/hci_core.h

@@ -717,6 +717,7 @@ int mgmt_new_key(u16 index, struct link_key *key, u8 old_key_type);
 int mgmt_connected(u16 index, bdaddr_t *bdaddr);
 int mgmt_disconnected(u16 index, bdaddr_t *bdaddr);
 int mgmt_disconnect_failed(u16 index);
+int mgmt_connect_failed(u16 index, bdaddr_t *bdaddr, u8 status);
 
 /* HCI info for socket */
 #define hci_pi(sk) ((struct hci_pinfo *) sk)

include/net/bluetooth/mgmt.h

@@ -184,3 +184,10 @@ struct mgmt_ev_disconnected {
 	__le16 index;
 	bdaddr_t bdaddr;
 } __packed;
+
+#define MGMT_EV_CONNECT_FAILED		0x000D
+struct mgmt_ev_connect_failed {
+	__le16 index;
+	bdaddr_t bdaddr;
+	__u8 status;
+} __packed;

net/bluetooth/hci_event.c

@@ -1166,8 +1166,11 @@ static inline void hci_conn_complete_evt(struct hci_dev *hdev, struct sk_buff *s
 			hci_send_cmd(hdev, HCI_OP_CHANGE_CONN_PTYPE,
 							sizeof(cp), &cp);
 		}
-	} else
+	} else {
 		conn->state = BT_CLOSED;
+		if (conn->type == ACL_LINK)
+			mgmt_connect_failed(hdev->id, &ev->bdaddr, ev->status);
+	}
 
 	if (conn->type == ACL_LINK)
 		hci_sco_setup(conn, ev->status);

net/bluetooth/mgmt.c

@@ -1227,3 +1227,14 @@ int mgmt_disconnect_failed(u16 index)
 
 	return err;
 }
+
+int mgmt_connect_failed(u16 index, bdaddr_t *bdaddr, u8 status)
+{
+	struct mgmt_ev_connect_failed ev;
+
+	put_unaligned_le16(index, &ev.index);
+	bacpy(&ev.bdaddr, bdaddr);
+	ev.status = status;
+
+	return mgmt_event(MGMT_EV_CONNECT_FAILED, &ev, sizeof(ev), NULL);
+}