From 1abc55d3114378b4e73ec315eac6b122e55148c4 Mon Sep 17 00:00:00 2001
From: Bart De Schuymer <bdschuym@pandora.be>
Date: Sat, 1 Jun 2002 19:23:47 +0000
Subject: Initial revision

---
 extensions/ebt_redirect.c | 109 ++++++++++++++++++++++++++++++++++++++++++++++
 1 file changed, 109 insertions(+)
 create mode 100644 extensions/ebt_redirect.c

(limited to 'extensions/ebt_redirect.c')

diff --git a/extensions/ebt_redirect.c b/extensions/ebt_redirect.c
new file mode 100644
index 0000000..3dff790
--- /dev/null
+++ b/extensions/ebt_redirect.c
@@ -0,0 +1,109 @@
+#include <stdio.h>
+#include <stdlib.h>
+#include <string.h>
+#include <sys/socket.h>
+#include <netinet/in.h>
+#include <linux/netfilter_bridge/ebtables.h>
+#include <getopt.h>
+#include "../include/ebtables_u.h"
+#include <linux/netfilter_bridge/ebt_redirect.h>
+
+extern char *standard_targets[NUM_STANDARD_TARGETS];
+
+#define REDIRECT_TARGET '1'
+static struct option opts[] =
+{
+	{ "redirect-target"    , required_argument, 0, REDIRECT_TARGET },
+	{ 0 }
+};
+
+static void print_help()
+{
+	printf(
+	"redirect option:\n"
+	" --redirect-target target   : ACCEPT, DROP or CONTINUE\n");
+}
+
+static void init(struct ebt_entry_target *target)
+{
+	struct ebt_redirect_info *redirectinfo =
+	   (struct ebt_redirect_info *)target->data;
+
+	redirectinfo->target = EBT_ACCEPT;
+	return;
+}
+
+
+#define OPT_REDIRECT_TARGET  0x01
+static int parse(int c, char **argv, int argc,
+   const struct ebt_u_entry *entry, unsigned int *flags,
+   struct ebt_entry_target **target)
+{
+	int i;
+	struct ebt_redirect_info *redirectinfo =
+	   (struct ebt_redirect_info *)(*target)->data;
+
+	switch (c) {
+	case REDIRECT_TARGET:
+		check_option(flags, OPT_REDIRECT_TARGET);
+		for (i = 0; i < NUM_STANDARD_TARGETS; i++)
+			if (!strcmp(optarg, standard_targets[i])) {
+				redirectinfo->target = i;
+				break;
+			}
+		if (i == NUM_STANDARD_TARGETS)
+			print_error("Illegal --redirect-target target");
+		break;
+	default:
+		return 0;
+	}
+	return 1;
+}
+
+static void final_check(const struct ebt_u_entry *entry,
+   const struct ebt_entry_target *target, const char *name, unsigned int hook)
+{
+	if ( (hook != NF_BR_PRE_ROUTING || strcmp(name, "nat")) &&
+	   (hook != NF_BR_BROUTING || strcmp(name, "broute")) )
+		print_error("Wrong chain for redirect");
+}
+
+static void print(const struct ebt_u_entry *entry,
+   const struct ebt_entry_target *target)
+{
+	struct ebt_redirect_info *redirectinfo =
+	   (struct ebt_redirect_info *)target->data;
+
+	printf("redirect");
+	printf(" --redirect-target %s", standard_targets[redirectinfo->target]);
+}
+
+static int compare(const struct ebt_entry_target *t1,
+   const struct ebt_entry_target *t2)
+{
+	struct ebt_redirect_info *redirectinfo1 =
+	   (struct ebt_redirect_info *)t1->data;
+	struct ebt_redirect_info *redirectinfo2 =
+	   (struct ebt_redirect_info *)t2->data;
+
+	return redirectinfo1->target == redirectinfo2->target;
+}
+
+static struct ebt_u_target redirect_target =
+{
+	EBT_REDIRECT_TARGET,
+	sizeof(struct ebt_redirect_info),
+	print_help,
+	init,
+	parse,
+	final_check,
+	print,
+	compare,
+	opts,
+};
+
+static void _init(void) __attribute__ ((constructor));
+static void _init(void)
+{
+	register_target(&redirect_target);
+}
-- 
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