1 files changed, 47 insertions, 0 deletions
diff --git a/src/expr/socket.c b/src/expr/socket.c
index 02d86f8..edd28ca 100644
--- a/src/expr/socket.c
+++ b/src/expr/socket.c
@@ -12,6 +12,7 @@
 #include <string.h>
 #include <arpa/inet.h>
 #include <errno.h>
+#include <assert.h>
 #include <linux/netfilter/nf_tables.h>
 
 #include "internal.h"
@@ -126,6 +127,47 @@ nftnl_expr_socket_parse(struct nftnl_expr *e, struct nlattr *attr)
 	return 0;
 }
 
+static int
+nftnl_expr_socket_reg_len(const struct nftnl_expr *e)
+{
+	const struct nftnl_expr_socket *socket = nftnl_expr_data(e);
+
+	switch(socket->key) {
+	case NFT_SOCKET_TRANSPARENT:
+	case NFT_SOCKET_WILDCARD:
+		return sizeof(uint8_t);
+	case NFT_SOCKET_MARK:
+		return sizeof(uint32_t);
+	case NFT_SOCKET_CGROUPV2:
+		return sizeof(uint64_t);
+	default:
+		assert(0);
+		break;
+	}
+
+	return sizeof(uint32_t);
+}
+
+static bool
+nftnl_expr_socket_reg_cmp(const struct nftnl_reg *reg,
+			  const struct nftnl_expr *e)
+{
+	const struct nftnl_expr_socket *socket = nftnl_expr_data(e);
+
+	return reg->socket.key == socket->key &&
+	       reg->socket.level == socket->level;
+}
+
+static void
+nftnl_expr_socket_reg_update(struct nftnl_reg *reg,
+			     const struct nftnl_expr *e)
+{
+	const struct nftnl_expr_socket *socket = nftnl_expr_data(e);
+
+	reg->socket.key = socket->key;
+	reg->socket.level = socket->level;
+}
+
 static const char *socket_key2str_array[NFT_SOCKET_MAX + 1] = {
 	[NFT_SOCKET_TRANSPARENT] = "transparent",
 	[NFT_SOCKET_MARK] = "mark",
@@ -166,4 +208,9 @@ struct expr_ops expr_ops_socket = {
 	.parse		= nftnl_expr_socket_parse,
 	.build		= nftnl_expr_socket_build,
 	.snprintf	= nftnl_expr_socket_snprintf,
+	.reg		= {
+		.len	= nftnl_expr_socket_reg_len,
+		.cmp	= nftnl_expr_socket_reg_cmp,
+		.update	= nftnl_expr_socket_reg_update,
+	},
 };