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>

net/tipc/netlink.c

@@ -102,7 +102,11 @@ const struct nla_policy tipc_nl_link_policy[TIPC_NLA_LINK_MAX + 1] = {
 const struct nla_policy tipc_nl_node_policy[TIPC_NLA_NODE_MAX + 1] = {
 	[TIPC_NLA_NODE_UNSPEC]		= { .type = NLA_UNSPEC },
 	[TIPC_NLA_NODE_ADDR]		= { .type = NLA_U32 },
-	[TIPC_NLA_NODE_UP]		= { .type = NLA_FLAG }
+	[TIPC_NLA_NODE_UP]		= { .type = NLA_FLAG },
+	[TIPC_NLA_NODE_ID]		= { .type = NLA_BINARY,
+					    .len = TIPC_NODEID_LEN},
+	[TIPC_NLA_NODE_KEY]		= { .type = NLA_BINARY,
+					    .len = TIPC_AEAD_KEY_SIZE_MAX},
 };
 
 /* Properties valid for media, bearer and link */
@@ -257,6 +261,18 @@ static const struct genl_ops tipc_genl_v2_ops[] = {
 		.dumpit	= tipc_udp_nl_dump_remoteip,
 	},
 #endif
+#ifdef CONFIG_TIPC_CRYPTO
+	{
+		.cmd	= TIPC_NL_KEY_SET,
+		.validate = GENL_DONT_VALIDATE_STRICT | GENL_DONT_VALIDATE_DUMP,
+		.doit	= tipc_nl_node_set_key,
+	},
+	{
+		.cmd	= TIPC_NL_KEY_FLUSH,
+		.validate = GENL_DONT_VALIDATE_STRICT | GENL_DONT_VALIDATE_DUMP,
+		.doit	= tipc_nl_node_flush_key,
+	},
+#endif
 };
 
 struct genl_family tipc_genl_family __ro_after_init = {