1 files changed, 53 insertions, 0 deletions
diff --git a/_conntrack/extensions/libnetfilter_conntrack_udp.c b/_conntrack/extensions/libnetfilter_conntrack_udp.c
new file mode 100644
index 0000000..de7c9f7
--- /dev/null
+++ b/_conntrack/extensions/libnetfilter_conntrack_udp.c
@@ -0,0 +1,53 @@
+/*
+ * (C) 2005 by Pablo Neira Ayuso <pablo@netfilter.org>
+ *
+ *      This program is free software; you can redistribute it and/or modify
+ *      it under the terms of the GNU General Public License as published by
+ *      the Free Software Foundation; either version 2 of the License, or
+ *      (at your option) any later version.
+ *
+ */
+#include <stdio.h>
+#include <getopt.h>
+#include <stdlib.h>
+#include <string.h>
+#include <netinet/in.h> /* For htons */
+#include <linux/netfilter/nfnetlink_conntrack.h>
+#include <libnetfilter_conntrack/libnetfilter_conntrack.h>
+
+void parse_proto(struct nfattr *cda[], struct nfct_tuple *tuple)
+{
+	if (cda[CTA_PROTO_SRC_PORT-1])
+		tuple->l4src.udp.port =
+			*(u_int16_t *)NFA_DATA(cda[CTA_PROTO_SRC_PORT-1]);
+	if (cda[CTA_PROTO_DST_PORT-1])
+		tuple->l4dst.udp.port =
+			*(u_int16_t *)NFA_DATA(cda[CTA_PROTO_DST_PORT-1]);
+}
+
+int print_proto(char *buf, struct nfct_tuple *tuple)
+{
+	return (sprintf(buf, "sport=%u dport=%u ", htons(tuple->l4src.udp.port),
+					           htons(tuple->l4dst.udp.port)));
+}
+
+static struct nfct_proto udp = {
+	.name 			= "udp",
+	.protonum		= IPPROTO_UDP,
+	.parse_proto		= parse_proto,
+	.print_proto		= print_proto,
+	.version		= LIBNETFILTER_CONNTRACK_VERSION,
+};
+
+void __attribute__ ((constructor)) init(void);
+void __attribute__ ((destructor)) fini(void);
+
+void init(void)
+{
+	nfct_register_proto(&udp);
+}
+
+void fini(void)
+{
+	nfct_unregister_proto(&udp);
+}