From edf2b7c0863133b38ba48dbcaa18a16bdba1a588 Mon Sep 17 00:00:00 2001
From: Florian Westphal <fw@strlen.de>
Date: Tue, 9 Oct 2018 17:21:37 +0200
Subject: ebtables-nft: add arpreply target

Unfortunately no nft translation available so far.

Signed-off-by: Florian Westphal <fw@strlen.de>
---
 extensions/libebt_arpreply.c | 106 +++++++++++++++++++++++++++++++++++++++++++
 extensions/libebt_arpreply.t |   4 ++
 2 files changed, 110 insertions(+)
 create mode 100644 extensions/libebt_arpreply.c
 create mode 100644 extensions/libebt_arpreply.t

(limited to 'extensions')

diff --git a/extensions/libebt_arpreply.c b/extensions/libebt_arpreply.c
new file mode 100644
index 00000000..998dece3
--- /dev/null
+++ b/extensions/libebt_arpreply.c
@@ -0,0 +1,106 @@
+/* ebt_arpreply
+ *
+ * Authors:
+ * Grzegorz Borowiak <grzes@gnu.univ.gda.pl>
+ * Bart De Schuymer <bdschuym@pandora.be>
+ *
+ *  August, 2003
+ */
+
+#include <stdio.h>
+#include <string.h>
+#include <stdlib.h>
+#include <getopt.h>
+#include <xtables.h>
+#include <netinet/ether.h>
+#include <linux/netfilter_bridge/ebt_arpreply.h>
+#include "iptables/nft.h"
+#include "iptables/nft-bridge.h"
+
+#define OPT_REPLY_MAC     0x01
+#define OPT_REPLY_TARGET  0x02
+
+#define REPLY_MAC '1'
+#define REPLY_TARGET '2'
+static const struct option brarpreply_opts[] = {
+	{ "arpreply-mac" ,    required_argument, 0, REPLY_MAC    },
+	{ "arpreply-target" , required_argument, 0, REPLY_TARGET },
+	XT_GETOPT_TABLEEND,
+};
+
+static void brarpreply_print_help(void)
+{
+	printf(
+	"arpreply target options:\n"
+	" --arpreply-mac address           : source MAC of generated reply\n"
+	" --arpreply-target target         : ACCEPT, DROP, RETURN or CONTINUE\n"
+	"                                    (standard target is DROP)\n");
+}
+
+static void brarpreply_init(struct xt_entry_target *target)
+{
+	struct ebt_arpreply_info *replyinfo = (void *)target->data;
+
+	replyinfo->target = EBT_DROP;
+}
+
+static int
+brarpreply_parse(int c, char **argv, int invert, unsigned int *flags,
+	    const void *entry, struct xt_entry_target **tg)
+
+{
+	struct ebt_arpreply_info *replyinfo = (void *)(*tg)->data;
+	struct ether_addr *addr;
+
+	switch (c) {
+	case REPLY_MAC:
+		EBT_CHECK_OPTION(flags, OPT_REPLY_MAC);
+		if (!(addr = ether_aton(optarg)))
+			xtables_error(PARAMETER_PROBLEM, "Problem with specified --arpreply-mac mac");
+		memcpy(replyinfo->mac, addr, ETH_ALEN);
+		break;
+	case REPLY_TARGET:
+		EBT_CHECK_OPTION(flags, OPT_REPLY_TARGET);
+		if (ebt_fill_target(optarg, (unsigned int *)&replyinfo->target))
+			xtables_error(PARAMETER_PROBLEM, "Illegal --arpreply-target target");
+		break;
+
+	default:
+		return 0;
+	}
+	return 1;
+}
+
+static void ebt_print_mac(const unsigned char *mac)
+{
+	printf("%s", ether_ntoa((struct ether_addr *) mac));
+}
+
+static void brarpreply_print(const void *ip, const struct xt_entry_target *t, int numeric)
+{
+	struct ebt_arpreply_info *replyinfo = (void *)t->data;
+
+	printf("--arpreply-mac ");
+	ebt_print_mac(replyinfo->mac);
+	if (replyinfo->target == EBT_DROP)
+		return;
+	printf(" --arpreply-target %s", ebt_target_name(replyinfo->target));
+}
+
+static struct xtables_target arpreply_target = {
+	.name		= "arpreply",
+	.version	= XTABLES_VERSION,
+	.family		= NFPROTO_BRIDGE,
+	.init		= brarpreply_init,
+	.size		= XT_ALIGN(sizeof(struct ebt_arpreply_info)),
+	.userspacesize	= XT_ALIGN(sizeof(struct ebt_arpreply_info)),
+	.help		= brarpreply_print_help,
+	.parse		= brarpreply_parse,
+	.print		= brarpreply_print,
+	.extra_opts	= brarpreply_opts,
+};
+
+void _init(void)
+{
+	xtables_register_target(&arpreply_target);
+}
diff --git a/extensions/libebt_arpreply.t b/extensions/libebt_arpreply.t
new file mode 100644
index 00000000..f7bc85f9
--- /dev/null
+++ b/extensions/libebt_arpreply.t
@@ -0,0 +1,4 @@
+:PREROUTING
+*nat
+-p ARP -i foo -j arpreply --arpreply-mac de:ad:0:be:ee:ff --arpreply-target ACCEPT;=;OK
+-p ARP -i foo -j arpreply --arpreply-mac de:ad:0:be:ee:ff;=;OK
-- 
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