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-rw-r--r--extensions/libipt_ECN.c125
1 files changed, 125 insertions, 0 deletions
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);
+}