[nrf fromtree] bluetooth: host: Add support for SMP error code 0x0f

This error code informs that peer device rejected key during
keys distribution phase.

Signed-off-by: Szymon Janc <[email protected]>
(cherry picked from commit 4c32c86f0a7d839affa895d4352eb75bc74efe4a)
Signed-off-by: Robert Lubos <[email protected]>

Author: sjanc

include/bluetooth/conn.h

@@ -751,6 +751,9 @@ enum bt_security_err {
 	/** Invalid parameters. */
 	BT_SECURITY_ERR_INVALID_PARAM,
 
+	/** Distributed Key Rejected */
+	BT_SECURITY_ERR_KEY_REJECTED,
+
 	/** Pairing failed but the exact reason could not be specified. */
 	BT_SECURITY_ERR_UNSPECIFIED,
 };

subsys/bluetooth/host/smp.c

@@ -430,6 +430,8 @@ static enum bt_security_err security_err_get(uint8_t smp_err)
 		return BT_SECURITY_ERR_PAIR_NOT_ALLOWED;
 	case BT_SMP_ERR_INVALID_PARAMS:
 		return BT_SECURITY_ERR_INVALID_PARAM;
+	case BT_SMP_ERR_KEY_REJECTED:
+		return BT_SECURITY_ERR_KEY_REJECTED;
 	case BT_SMP_ERR_UNSPECIFIED:
 	default:
 		return BT_SECURITY_ERR_UNSPECIFIED;

subsys/bluetooth/host/smp.h

@@ -27,6 +27,7 @@ struct bt_smp_hdr {
 #define BT_SMP_ERR_NUMERIC_COMP_FAILED		0x0c
 #define BT_SMP_ERR_BREDR_PAIRING_IN_PROGRESS	0x0d
 #define BT_SMP_ERR_CROSS_TRANSP_NOT_ALLOWED	0x0e
+#define BT_SMP_ERR_KEY_REJECTED			0x0f
 
 #define BT_SMP_IO_DISPLAY_ONLY			0x00
 #define BT_SMP_IO_DISPLAY_YESNO			0x01