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--- /dev/null
+++ b/extensions/libxt_id.c
@@ -0,0 +1,45 @@
+/* Shared library add-on to iptables to add id match support. */
+
+#include <stdio.h>
+#include <xtables.h>
+#include <linux/netfilter/xt_id.h>
+
+enum {
+ O_ID = 0,
+};
+
+static const struct xt_option_entry id_opts[] = {
+ {
+ .name = "id",
+ .id = O_ID,
+ .type = XTTYPE_UINT32,
+ .flags = XTOPT_MAND | XTOPT_PUT,
+ XTOPT_POINTER(struct xt_id_info, id)
+ },
+ XTOPT_TABLEEND,
+};
+
+/* Saves the union ipt_matchinfo in parsable form to stdout. */
+static void
+id_save(const void *ip, const struct xt_entry_match *match)
+{
+ struct xt_id_info *idinfo = (void *)match->data;
+
+ printf(" --id %lu", idinfo->id);
+}
+
+static struct xtables_match id_match = {
+ .family = NFPROTO_UNSPEC,
+ .name = "id",
+ .version = XTABLES_VERSION,
+ .size = XT_ALIGN(sizeof(struct xt_id_info)),
+ .userspacesize = XT_ALIGN(sizeof(struct xt_id_info)),
+ .save = id_save,
+ .x6_parse = xtables_option_parse,
+ .x6_options = id_opts,
+};
+
+void _init(void)
+{
+ xtables_register_match(&id_match);
+}
--- /dev/null
+++ b/include/linux/netfilter/xt_id.h
@@ -0,0 +1,8 @@
+#ifndef _XT_ID_H
+#define _XT_ID_H
+
+struct xt_id_info {
+ __u32 id;
+};
+
+#endif /* XT_ID_H */
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