From 385a1dd0f3b01fc0fbd6bcdee9796e0240ea77c1 Mon Sep 17 00:00:00 2001
From: Harald Welte <laforge@gnumonks.org>
Date: Sun, 17 Feb 2002 21:32:32 +0000
Subject: add ECN target support

---
 extensions/libipt_ECN.c | 125 ++++++++++++++++++++++++++++++++++++++++++++++++
 1 file changed, 125 insertions(+)
 create mode 100644 extensions/libipt_ECN.c

(limited to 'extensions')

diff --git a/extensions/libipt_ECN.c b/extensions/libipt_ECN.c
new file mode 100644
index 00000000..63c280ed
--- /dev/null
+++ b/extensions/libipt_ECN.c
@@ -0,0 +1,125 @@
+/* Shared library add-on to iptables for ECN, $Version$
+ *
+ * (C) 2002 by Harald Welte <laforge@gnumonks.org>
+ *
+ * This program is distributed under the terms of GNU GPL v2, 1991
+ *
+ * libipt_ECN.c borrowed heavily from libipt_DSCP.c
+ *
+ * $Id$
+ */
+#include <stdio.h>
+#include <string.h>
+#include <stdlib.h>
+#include <getopt.h>
+
+#include <iptables.h>
+#include <linux/netfilter_ipv4/ip_tables.h>
+#include <linux/netfilter_ipv4/ipt_ECN.h>
+
+static void init(struct ipt_entry_target *t, unsigned int *nfcache) 
+{
+}
+
+static void help(void) 
+{
+	printf(
+"ECN target options\n"
+"  --ecn-remove			Remove all ECN bits which may be present\n"
+"  		                in the IPv4 header\n"
+);
+}
+
+static struct option opts[] = {
+	{ "ecn-remove", 1, 0, 'F' },
+	{ 0 }
+};
+
+static int
+parse(int c, char **argv, int invert, unsigned int *flags,
+      const struct ipt_entry *entry,
+      struct ipt_entry_target **target)
+{
+	struct ipt_ECN_info *finfo
+		= (struct ipt_ECN_info *)(*target)->data;
+
+	switch (c) {
+	case 'F':
+		if (*flags)
+			exit_error(PARAMETER_PROBLEM,
+			           "ECN target: Only use --ecn-remove ONCE!");
+		einfo->operation = IPT_ECN_OP_REMOVE;
+		*flags = 1;
+		break;
+
+	default:
+		return 0;
+	}
+
+	return 1;
+}
+
+static void
+final_check(unsigned int flags)
+{
+	if (!flags)
+		exit_error(PARAMETER_PROBLEM,
+		           "ECN target: Parameter --ecn-remove is required");
+}
+
+/* Prints out the targinfo. */
+static void
+print(const struct ipt_ip *ip,
+      const struct ipt_entry_target *target,
+      int numeric)
+{
+	const struct ipt_ECN_info *einfo =
+		(const struct ipt_ECN_info *)target->data;
+
+	printf("ECN ");
+
+	switch (einfo->operation) {
+		case IPT_ECN_OP_REMOVE:
+			printf("remove ");
+			break;
+		default:
+			printf("unsupported_ecn_operation ");
+			break;
+	}
+}
+
+/* Saves the union ipt_targinfo in parsable form to stdout. */
+static void
+save(const struct ipt_ip *ip, const struct ipt_entry_target *target)
+{
+	const struct ipt_ECN_info *einfo =
+		(const struct ipt_ECN_info *)target->data;
+
+	switch (einfo->operation) {
+		case IPT_ECN_OP_REMOVE:
+			printf("--ecn-remove ");
+			break;
+		default:
+	}
+}
+
+static
+struct iptables_target ecn
+= { NULL,
+    "ECN",
+    NETFILTER_VERSION,
+    IPT_ALIGN(sizeof(struct ipt_ECN_info)),
+    IPT_ALIGN(sizeof(struct ipt_ECN_info)),
+    &help,
+    &init,
+    &parse,
+    &final_check,
+    &print,
+    &save,
+    opts
+};
+
+void _init(void)
+{
+	register_target(&ecn);
+}
-- 
cgit v1.2.3