new IPV4OPTSSTRIP target

diff --git a/extensions/.IPV4OPTSSTRIP-test b/extensions/.IPV4OPTSSTRIP-test
new file mode 100755 (executable)
index 0000000..cfd84ee
--- /dev/null
+++ b/extensions/.IPV4OPTSSTRIP-test
@@ -0,0 +1,3 @@
+#!/bin/sh
+# True if IPV4OPTSSTRIP patch is applied.
+[ -f $KERNEL_DIR/net/ipv4/netfilter/ipt_IPV4OPTSSTRIP.c ] && echo IPV4OPTSSTRIP

diff --git a/extensions/libipt_IPV4OPTSSTRIP.c b/extensions/libipt_IPV4OPTSSTRIP.c
new file mode 100644 (file)
index 0000000..59cbf19
--- /dev/null
+++ b/extensions/libipt_IPV4OPTSSTRIP.c
@@ -0,0 +1,81 @@
+/* Shared library add-on to iptables for IPV4OPTSSTRIP
+ * This modules strip all the IP options.
+ *
+ * (C) 2001 by Fabrice MARIE <fabrice@celestix.com>
+ * This program is distributed under the terms of GNU GPL v2, 1991
+ */
+
+#include <stdio.h>
+#include <string.h>
+#include <stdlib.h>
+#include <getopt.h>
+
+#include <iptables.h>
+#include <linux/netfilter_ipv4/ip_tables.h>
+
+static void init(struct ipt_entry_target *t, unsigned int *nfcache) 
+{
+        *nfcache |= NFC_UNKNOWN;
+}
+
+static void help(void) 
+{
+       printf("IPV4OPTSSTRIP v%s target takes no option !! Make sure you use it in the mangle table.\n",
+              NETFILTER_VERSION);
+}
+
+static struct option opts[] = {
+       { 0 }
+};
+
+/* Function which parses command options; returns true if it
+   ate an option */
+static int
+parse(int c, char **argv, int invert, unsigned int *flags,
+      const struct ipt_entry *entry,
+      struct ipt_entry_target **target)
+{
+       return 0;
+}
+
+static void
+final_check(unsigned int flags)
+{
+}
+
+/* Prints out the targinfo. */
+static void
+print(const struct ipt_ip *ip,
+      const struct ipt_entry_target *target,
+      int numeric)
+{
+       /* nothing to print, we don't take option... */
+}
+
+/* Saves the stuff in parsable form to stdout. */
+static void
+save(const struct ipt_ip *ip, const struct ipt_entry_target *target)
+{
+       /* nothing to print, we don't take option... */
+}
+
+static
+struct iptables_target IPV4OPTSSTRIP
+= { NULL,
+    "IPV4OPTSSTRIP",
+    NETFILTER_VERSION,
+    IPT_ALIGN(0),
+    IPT_ALIGN(0),
+    &help,
+    &init,
+    &parse,
+    &final_check,
+    &print,
+    &save,
+    opts
+};
+
+void _init(void)
+{
+       register_target(&IPV4OPTSSTRIP);
+}