Bluetooth: L2CAP: Introduce proper defines for PSM ranges

Having proper defines makes the code a bit readable, it also avoids
duplicating hard-coded values since these are also needed when
auto-allocating PSM values (in a subsequent patch).
Signed-off-by: Johan Hedberg <johan.hedberg@intel.com>
Signed-off-by: Marcel Holtmann <marcel@holtmann.org>

include/net/bluetooth/l2cap.h

@@ -252,6 +252,12 @@ struct l2cap_conn_rsp {
 #define L2CAP_PSM_3DSP		0x0021
 #define L2CAP_PSM_IPSP		0x0023 /* 6LoWPAN */
 
+#define L2CAP_PSM_DYN_START	0x1001
+#define L2CAP_PSM_DYN_END	0xffff
+#define L2CAP_PSM_AUTO_END	0x10ff
+#define L2CAP_PSM_LE_DYN_START  0x0080
+#define L2CAP_PSM_LE_DYN_END	0x00ff
+
 /* channel identifier */
 #define L2CAP_CID_SIGNALING	0x0001
 #define L2CAP_CID_CONN_LESS	0x0002

net/bluetooth/l2cap_sock.c

@@ -58,7 +58,7 @@ static int l2cap_validate_bredr_psm(u16 psm)
 		return -EINVAL;
 
 	/* Restrict usage of well-known PSMs */
-	if (psm < 0x1001 && !capable(CAP_NET_BIND_SERVICE))
+	if (psm < L2CAP_PSM_DYN_START && !capable(CAP_NET_BIND_SERVICE))
 		return -EACCES;
 
 	return 0;
@@ -67,11 +67,11 @@ static int l2cap_validate_bredr_psm(u16 psm)
 static int l2cap_validate_le_psm(u16 psm)
 {
 	/* Valid LE_PSM ranges are defined only until 0x00ff */
-	if (psm > 0x00ff)
+	if (psm > L2CAP_PSM_LE_DYN_END)
 		return -EINVAL;
 
 	/* Restrict fixed, SIG assigned PSM values to CAP_NET_BIND_SERVICE */
-	if (psm <= 0x007f && !capable(CAP_NET_BIND_SERVICE))
+	if (psm < L2CAP_PSM_LE_DYN_START && !capable(CAP_NET_BIND_SERVICE))
 		return -EACCES;
 
 	return 0;