1 files changed, 46 insertions, 0 deletions
diff --git a/src/expr/rt.c b/src/expr/rt.c
index 1ad9b2a..16a1aff 100644
--- a/src/expr/rt.c
+++ b/src/expr/rt.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"
@@ -112,6 +113,46 @@ nftnl_expr_rt_parse(struct nftnl_expr *e, struct nlattr *attr)
 	return 0;
 }
 
+static int nftnl_expr_rt_reg_len(const struct nftnl_expr *e)
+{
+	const struct nftnl_expr_rt *rt = nftnl_expr_data(e);
+
+	switch (rt->key) {
+	case NFT_RT_CLASSID:
+	case NFT_RT_NEXTHOP4:
+		return sizeof(uint32_t);
+	case NFT_RT_NEXTHOP6:
+		return sizeof(uint32_t) * 4;
+	case NFT_RT_TCPMSS:
+		return sizeof(uint16_t);
+	case NFT_RT_XFRM:
+		return sizeof(uint8_t);
+	default:
+		assert(0);
+		break;
+	}
+
+	return sizeof(uint32_t);
+}
+
+static bool
+nftnl_expr_rt_reg_cmp(const struct nftnl_reg *reg,
+			       const struct nftnl_expr *e)
+{
+	const struct nftnl_expr_rt *rt = nftnl_expr_data(e);
+
+	return reg->rt.key == rt->key;
+}
+
+static void
+nftnl_expr_rt_reg_update(struct nftnl_reg *reg,
+				  const struct nftnl_expr *e)
+{
+	const struct nftnl_expr_rt *rt = nftnl_expr_data(e);
+
+	reg->rt.key = rt->key;
+}
+
 static const char *rt_key2str_array[NFT_RT_MAX + 1] = {
 	[NFT_RT_CLASSID]	= "classid",
 	[NFT_RT_NEXTHOP4]	= "nexthop4",
@@ -163,4 +204,9 @@ struct expr_ops expr_ops_rt = {
 	.parse		= nftnl_expr_rt_parse,
 	.build		= nftnl_expr_rt_build,
 	.snprintf	= nftnl_expr_rt_snprintf,
+	.reg		= {
+		.len	= nftnl_expr_rt_reg_len,
+		.cmp	= nftnl_expr_rt_reg_cmp,
+		.update	= nftnl_expr_rt_reg_update,
+	},
 };