exthdr: add boolean DCCP option matching

Iptables supports the matching of DCCP packets based on the presence
or absence of DCCP options.  Extend exthdr expressions to add this
functionality to nftables.

Link: https://bugzilla.netfilter.org/show_bug.cgi?id=930
Signed-off-by: Jeremy Sowden <jeremy@azazel.net>
Signed-off-by: Pablo Neira Ayuso <pablo@netfilter.org>

1 files changed, 5 insertions, 0 deletions

diff --git a/src/json.c b/src/json.c
index 1b42ebc0..981d177b 100644
--- a/src/json.c
+++ b/src/json.c
@@ -751,6 +751,11 @@ json_t *exthdr_expr_json(const struct expr *expr, struct output_ctx *octx)
 		return json_pack("{s:o}", "tcp option", root);
 	}
 
+	if (expr->exthdr.op == NFT_EXTHDR_OP_DCCP) {
+		root = json_pack("{s:i}", "type", expr->exthdr.raw_type);
+		return json_pack("{s:o}", "dccp option", root);
+	}
+
 	root = json_pack("{s:s}", "name", desc);
 	if (!is_exists)
 		json_object_set_new(root, "field", json_string(field));