[PATCH BlueZ 1/6] mgmt: Add Security Level Changed event

["Frédéric Danis" <frederic.danis@collabora.com>]

This provides a TLV list of values related to the security level of
the connection to a remote device.

Currently Security Level and Encryption type are implemented.
---
 doc/mgmt-protocol.rst | 45 +++++++++++++++++++++++++++++++++++++++++++
 lib/bluetooth/mgmt.h  | 15 +++++++++++++++
 2 files changed, 60 insertions(+)

diff --git a/doc/mgmt-protocol.rst b/doc/mgmt-protocol.rst
index f0564075f..1693ff677 100644
--- a/doc/mgmt-protocol.rst
+++ b/doc/mgmt-protocol.rst
@@ -5521,3 +5521,48 @@ The Supervision_Timeout parameter specifies the supervision timeout in units
 of 10 ms.
 
 This event will be sent to all management sockets.
+
+Security Level Changed
+``````````````````````
+
+:Event Code:		0x0034
+:Controller Index:	<controller_id>
+:Event Parameters:	Address (6 Octets)
+:...:			Address_Type (1 Octet)
+:...:			Count (1 Octet)
+:...:			TLV_List (variable)
+
+This event indicates that the security level of a device has changed.
+
+Possible values for the TLV type parameter:
+
+.. csv-table::
+	:header: "Type", "Description"
+	:widths: auto
+
+	0x0000, Security Level
+	0x0001, Encryption type
+
+Possible values for the Security Level type:
+
+.. csv-table::
+	:header: "Value", "Description"
+	:widths: auto
+
+	0x00, No security
+	0x01, Unauthenticated pairing with encryption not required
+	0x02, Unauthenticated pairing with encryption desired
+	0x03, Authenticated pairing with encryption
+	0x04, FIPS authenticated pairing with encryption
+
+Possible values for the Encryption type:
+
+.. csv-table::
+	:header: "Value", "Description"
+	:widths: auto
+
+	0x00, No encryption
+	0x01, E0 encryption
+	0x02, AES-CCM encryption
+
+This event will be sent to all management sockets.
diff --git a/lib/bluetooth/mgmt.h b/lib/bluetooth/mgmt.h
index 9df0c1ba2..6e0494757 100644
--- a/lib/bluetooth/mgmt.h
+++ b/lib/bluetooth/mgmt.h
@@ -1136,6 +1136,20 @@ struct mgmt_ev_conn_subrate {
 	uint16_t supv_timeout;
 } __packed;
 
+#define MGMT_CONN_SEC_ENCRYPT_NONE		0x00
+#define MGMT_CONN_SEC_ENCRYPT_E0		0x01
+#define MGMT_CONN_SEC_ENCRYPT_AES_CCM		0x02
+
+#define MGMT_SEC_LEVEL_CHANGED_PARAM_LEVEL	0x0000
+#define MGMT_SEC_LEVEL_CHANGED_PARAM_ENC_TYPE	0x0001
+
+#define MGMT_EV_SECURITY_LEVEL_CHANGED		0x0034
+struct mgmt_ev_security_level_changed {
+	struct mgmt_addr_info addr;
+	uint8_t	tlv_count;
+	uint8_t	tlv_data[] __counted_by(tlv_count);
+} __packed;
+
 static const char *mgmt_op[] = {
 	"<0x0000>",
 	"Read Version",
@@ -1285,6 +1299,7 @@ static const char *mgmt_ev[] = {
 	"Mesh Packet Found",
 	"Mesh Packet Complete",
 	"Connection Subrate",
+	"Security Level Changed",
 };
 
 static const char *mgmt_status[] = {
-- 
2.43.0