1 files changed, 134 insertions, 0 deletions
diff --git a/extensions/libebt_dnat.c b/extensions/libebt_dnat.c
new file mode 100644
index 00000000..c179d8c1
--- /dev/null
+++ b/extensions/libebt_dnat.c
@@ -0,0 +1,134 @@
+/* ebt_nat
+ *
+ * Authors:
+ * Bart De Schuymer <bdschuym@pandora.be>
+ *
+ * June, 2002
+ */
+
+#include <stdio.h>
+#include <stdlib.h>
+#include <string.h>
+#include <getopt.h>
+#include <netinet/ether.h>
+#include <xtables.h>
+#include <linux/netfilter_bridge/ebt_nat.h>
+#include "iptables/nft.h"
+#include "iptables/nft-bridge.h"
+
+#define NAT_D '1'
+#define NAT_D_TARGET '2'
+static const struct option brdnat_opts[] =
+{
+	{ "to-destination", required_argument, 0, NAT_D },
+	{ "to-dst"        , required_argument, 0, NAT_D },
+	{ "dnat-target"   , required_argument, 0, NAT_D_TARGET },
+	{ 0 }
+};
+
+static void brdnat_print_help(void)
+{
+	printf(
+	"dnat options:\n"
+	" --to-dst address       : MAC address to map destination to\n"
+	" --dnat-target target   : ACCEPT, DROP, RETURN or CONTINUE\n");
+}
+
+static void brdnat_init(struct xt_entry_target *target)
+{
+	struct ebt_nat_info *natinfo = (struct ebt_nat_info *)target->data;
+
+	natinfo->target = EBT_ACCEPT;
+}
+
+#define OPT_DNAT        0x01
+#define OPT_DNAT_TARGET 0x02
+static int brdnat_parse(int c, char **argv, int invert, unsigned int *flags,
+			 const void *entry, struct xt_entry_target **target)
+{
+	struct ebt_nat_info *natinfo = (struct ebt_nat_info *)(*target)->data;
+	struct ether_addr *addr;
+
+	switch (c) {
+	case NAT_D:
+		EBT_CHECK_OPTION(flags, OPT_DNAT);
+		if (!(addr = ether_aton(optarg)))
+			xtables_error(PARAMETER_PROBLEM, "Problem with specified --to-destination mac");
+		memcpy(natinfo->mac, addr, ETH_ALEN);
+		break;
+	case NAT_D_TARGET:
+		EBT_CHECK_OPTION(flags, OPT_DNAT_TARGET);
+		if (ebt_fill_target(optarg, (unsigned int *)&natinfo->target))
+			xtables_error(PARAMETER_PROBLEM, "Illegal --dnat-target target");
+		break;
+	default:
+		return 0;
+	}
+	return 1;
+}
+
+static void brdnat_final_check(unsigned int flags)
+{
+	if (!flags)
+		xtables_error(PARAMETER_PROBLEM,
+			      "You must specify proper arguments");
+}
+
+static void ebt_print_mac(const unsigned char *mac)
+{
+	printf("%s", ether_ntoa((struct ether_addr *) mac));
+}
+
+static void brdnat_print(const void *ip, const struct xt_entry_target *target, int numeric)
+{
+	struct ebt_nat_info *natinfo = (struct ebt_nat_info *)target->data;
+
+	printf("--to-dst ");
+	ebt_print_mac(natinfo->mac);
+	printf(" --dnat-target %s", ebt_target_name(natinfo->target));
+}
+
+static const char* brdnat_verdict(int verdict)
+{
+	switch (verdict) {
+	case EBT_ACCEPT: return "accept";
+	case EBT_DROP: return "drop";
+	case EBT_CONTINUE: return "continue";
+	case EBT_RETURN: return "return";
+	}
+
+	return "";
+}
+
+static int brdnat_xlate(struct xt_xlate *xl,
+			 const struct xt_xlate_tg_params *params)
+{
+	const struct ebt_nat_info *natinfo = (const void*)params->target->data;
+
+	xt_xlate_add(xl, "ether daddr set %s %s ",
+		     ether_ntoa((struct ether_addr *)natinfo->mac),
+		     brdnat_verdict(natinfo->target));
+
+	return 1;
+}
+
+static struct xtables_target brdnat_target =
+{
+	.name		= "dnat",
+	.version	= XTABLES_VERSION,
+	.family		= NFPROTO_BRIDGE,
+	.size           = XT_ALIGN(sizeof(struct ebt_nat_info)),
+	.userspacesize	= XT_ALIGN(sizeof(struct ebt_nat_info)),
+	.help		= brdnat_print_help,
+	.init		= brdnat_init,
+	.parse		= brdnat_parse,
+	.final_check	= brdnat_final_check,
+	.print		= brdnat_print,
+	.xlate		= brdnat_xlate,
+	.extra_opts	= brdnat_opts,
+};
+
+void _init(void)
+{
+	xtables_register_target(&brdnat_target);
+}