1 files changed, 96 insertions, 0 deletions
diff --git a/extensions/libxt_rpfilter.c b/extensions/libxt_rpfilter.c
new file mode 100644
index 00000000..168e703f
--- /dev/null
+++ b/extensions/libxt_rpfilter.c
@@ -0,0 +1,96 @@
+#include <stdio.h>
+#include <xtables.h>
+#include <linux/netfilter/xt_rpfilter.h>
+
+enum {
+	O_RPF_LOOSE = 0,
+	O_RPF_VMARK = 1,
+	O_RPF_ACCEPT_LOCAL = 2,
+	O_RPF_INVERT = 3,
+};
+
+static void rpfilter_help(void)
+{
+	printf(
+"rpfilter match options:\n"
+"    --loose          permit reverse path via any interface\n"
+"    --validmark      use skb nfmark when performing route lookup\n"
+"    --accept-local   do not reject packets with a local source address\n"
+"    --invert         match packets that failed the reverse path test\n"
+	);
+}
+
+static const struct xt_option_entry rpfilter_opts[] = {
+	{.name = "loose", .id = O_RPF_LOOSE, .type = XTTYPE_NONE, },
+	{.name = "validmark", .id = O_RPF_VMARK, .type = XTTYPE_NONE, },
+	{.name = "accept-local", .id = O_RPF_ACCEPT_LOCAL, .type = XTTYPE_NONE, },
+	{.name = "invert", .id = O_RPF_INVERT, .type = XTTYPE_NONE, },
+	XTOPT_TABLEEND,
+};
+
+static void rpfilter_parse(struct xt_option_call *cb)
+{
+	struct xt_rpfilter_info *rpfinfo = cb->data;
+
+	xtables_option_parse(cb);
+	switch (cb->entry->id) {
+	case O_RPF_LOOSE:
+		rpfinfo->flags |= XT_RPFILTER_LOOSE;
+		break;
+	case O_RPF_VMARK:
+		rpfinfo->flags |= XT_RPFILTER_VALID_MARK;
+		break;
+	case O_RPF_ACCEPT_LOCAL:
+		rpfinfo->flags |= XT_RPFILTER_ACCEPT_LOCAL;
+		break;
+	case O_RPF_INVERT:
+		rpfinfo->flags |= XT_RPFILTER_INVERT;
+		break;
+	}
+}
+
+static void
+rpfilter_print_prefix(const void *ip, const void *matchinfo,
+			const char *prefix)
+{
+	const struct xt_rpfilter_info *info = matchinfo;
+	if (info->flags & XT_RPFILTER_LOOSE)
+		printf(" %s%s", prefix, rpfilter_opts[O_RPF_LOOSE].name);
+	if (info->flags & XT_RPFILTER_VALID_MARK)
+		printf(" %s%s", prefix, rpfilter_opts[O_RPF_VMARK].name);
+	if (info->flags & XT_RPFILTER_ACCEPT_LOCAL)
+		printf(" %s%s", prefix, rpfilter_opts[O_RPF_ACCEPT_LOCAL].name);
+	if (info->flags & XT_RPFILTER_INVERT)
+		printf(" %s%s", prefix, rpfilter_opts[O_RPF_INVERT].name);
+}
+
+
+static void
+rpfilter_print(const void *ip, const struct xt_entry_match *match, int numeric)
+{
+	printf(" rpfilter");
+	return rpfilter_print_prefix(ip, match->data, "");
+}
+
+static void rpfilter_save(const void *ip, const struct xt_entry_match *match)
+{
+	return rpfilter_print_prefix(ip, match->data, "--");
+}
+
+static struct xtables_match rpfilter_match = {
+	.family		= NFPROTO_UNSPEC,
+	.name		= "rpfilter",
+	.version	= XTABLES_VERSION,
+	.size		= XT_ALIGN(sizeof(struct xt_rpfilter_info)),
+	.userspacesize	= XT_ALIGN(sizeof(struct xt_rpfilter_info)),
+	.help		= rpfilter_help,
+	.print		= rpfilter_print,
+	.save		= rpfilter_save,
+	.x6_parse	= rpfilter_parse,
+	.x6_options	= rpfilter_opts,
+};
+
+void _init(void)
+{
+	xtables_register_match(&rpfilter_match);
+}