1 files changed, 50 insertions, 2 deletions

diff --git a/src/rule.c b/src/rule.c
index e792169..5e9b16d 100644
--- a/src/rule.c
+++ b/src/rule.c
@@ -668,6 +668,52 @@ int nft_rule_parse(struct nft_rule *r, enum nft_rule_parse_type type, char *data
 }
 EXPORT_SYMBOL(nft_rule_parse);
 
+static int nft_rule_snprintf_json(char *buf, size_t size, struct nft_rule *r,
+					 uint32_t type, uint32_t flags)
+{
+	int ret, len = size, offset = 0;
+	struct nft_rule_expr *expr;
+
+	ret = snprintf(buf, size,
+				"{ \"rule\": { \"family\" : \"%s\", \"table\" : \"%s\", "
+				"\"chain\"  : \"%s\", \"handle\" : %llu, \"version\" : %d, ",
+				nft_family2str(r->family), r->table, r->chain,
+				(unsigned long long)r->handle,
+				NFT_RULE_JSON_VERSION);
+	SNPRINTF_BUFFER_SIZE(ret, size, len, offset);
+
+	ret = snprintf(buf+offset, len, "\"rule_flags\" : %u, ",
+					r->rule_flags);
+	SNPRINTF_BUFFER_SIZE(ret, size, len, offset);
+
+	if(NFT_RULE_ATTR_COMPAT_PROTO != 0 || NFT_RULE_ATTR_COMPAT_FLAGS != 0){
+		ret = snprintf(buf+offset,len,"\"compat_flags\" : %u, "
+									  "\"compat_proto\" : %u, ",
+					r->compat.flags, r->compat.proto);
+		SNPRINTF_BUFFER_SIZE(ret, size, len, offset);
+	}
+
+	ret = snprintf(buf+offset, len, "\"expr\" : [");
+		SNPRINTF_BUFFER_SIZE(ret, size, len, offset);
+
+	list_for_each_entry(expr, &r->expr_list, head) {
+		ret = snprintf(buf+offset, len,
+				" { \"type\" : \"%s\", ", expr->ops->name);
+		SNPRINTF_BUFFER_SIZE(ret, size, len, offset);
+
+		ret = expr->ops->snprintf(buf+offset, len, type, flags, expr);
+		SNPRINTF_BUFFER_SIZE(ret, size, len, offset);
+
+		ret = snprintf(buf+offset, len, "},");
+		SNPRINTF_BUFFER_SIZE(ret, size, len, offset);
+
+	}
+	ret = snprintf(buf+offset-1, len, "]}}");
+		SNPRINTF_BUFFER_SIZE(ret, size, len, offset);
+
+	return offset;
+}
+
 static int nft_rule_snprintf_xml(char *buf, size_t size, struct nft_rule *r,
 				 uint32_t type, uint32_t flags)
 {
@@ -739,10 +785,12 @@ int nft_rule_snprintf(char *buf, size_t size, struct nft_rule *r,
 		       uint32_t type, uint32_t flags)
 {
 	switch(type) {
-	case NFT_RULE_O_XML:
-		return nft_rule_snprintf_xml(buf, size, r, type, flags);
 	case NFT_RULE_O_DEFAULT:
 		return nft_rule_snprintf_default(buf, size, r, type, flags);
+	case NFT_RULE_O_XML:
+		return nft_rule_snprintf_xml(buf, size, r, type, flags);
+	case NFT_RULE_O_JSON:
+		return nft_rule_snprintf_json(buf, size, r, type, flags);
 	default:
 		break;
 	}