tipc: add support for AEAD key setting via netlink

This commit adds two netlink commands to TIPC in order for user to be
able to set or remove AEAD keys:
- TIPC_NL_KEY_SET
- TIPC_NL_KEY_FLUSH

When the 'KEY_SET' is given along with the key data, the key will be
initiated and attached to TIPC crypto. On the other hand, the
'KEY_FLUSH' command will remove all existing keys if any.

Acked-by: Ying Xue <ying.xue@windreiver.com>
Acked-by: Jon Maloy <jon.maloy@ericsson.com>
Signed-off-by: Tuong Lien <tuong.t.lien@dektech.com.au>
Signed-off-by: David S. Miller <davem@davemloft.net>

include/uapi/linux/tipc_netlink.h

@@ -63,6 +63,8 @@ enum {
 	TIPC_NL_PEER_REMOVE,
 	TIPC_NL_BEARER_ADD,
 	TIPC_NL_UDP_GET_REMOTEIP,
+	TIPC_NL_KEY_SET,
+	TIPC_NL_KEY_FLUSH,
 
 	__TIPC_NL_CMD_MAX,
 	TIPC_NL_CMD_MAX = __TIPC_NL_CMD_MAX - 1
@@ -160,6 +162,8 @@ enum {
 	TIPC_NLA_NODE_UNSPEC,
 	TIPC_NLA_NODE_ADDR,		/* u32 */
 	TIPC_NLA_NODE_UP,		/* flag */
+	TIPC_NLA_NODE_ID,		/* data */
+	TIPC_NLA_NODE_KEY,		/* data */
 
 	__TIPC_NLA_NODE_MAX,
 	TIPC_NLA_NODE_MAX = __TIPC_NLA_NODE_MAX - 1