release/src/router/iptables/extensions/libipt_IPV4OPTSSTRIP.c

   1 /* Shared library add-on to iptables for IPV4OPTSSTRIP
   2  * This modules strip all the IP options.
   3  *
   4  * (C) 2001 by Fabrice MARIE <fabrice@netfilter.org>
   5  * This program is distributed under the terms of GNU GPL v2, 1991
   6  */
   7
   8 #include <stdio.h>
   9 #include <string.h>
  10 #include <stdlib.h>
  11 #include <getopt.h>
  12
  13 #include <iptables.h>
  14 #include <linux/netfilter_ipv4/ip_tables.h>
  15
  16 static void help(void)
  17 {
  18         printf("IPV4OPTSSTRIP v%s target takes no option !! Make sure you use it in the mangle table.\n",
  19                IPTABLES_VERSION);
  20 }
  21
  22 static struct option opts[] = {
  23         { 0 }
  24 };
  25
  26 /* Function which parses command options; returns true if it
  27    ate an option */
  28 static int
  29 parse(int c, char **argv, int invert, unsigned int *flags,
  30       const struct ipt_entry *entry,
  31       struct ipt_entry_target **target)
  32 {
  33         return 0;
  34 }
  35
  36 static void
  37 final_check(unsigned int flags)
  38 {
  39 }
  40
  41 /* Prints out the targinfo. */
  42 static void
  43 print(const struct ipt_ip *ip,
  44       const struct ipt_entry_target *target,
  45       int numeric)
  46 {
  47         /* nothing to print, we don't take option... */
  48 }
  49
  50 /* Saves the stuff in parsable form to stdout. */
  51 static void
  52 save(const struct ipt_ip *ip, const struct ipt_entry_target *target)
  53 {
  54         /* nothing to print, we don't take option... */
  55 }
  56
  57 static struct iptables_target IPV4OPTSSTRIP = {
  58         .next           = NULL,
  59         .name           = "IPV4OPTSSTRIP",
  60         .version        = IPTABLES_VERSION,
  61         .size           = IPT_ALIGN(0),
  62         .userspacesize  = IPT_ALIGN(0),
  63         .help           = &help,
  64         .parse          = &parse,
  65         .final_check    = &final_check,
  66         .print          = &print,
  67         .save           = &save,
  68         .extra_opts     = opts
  69 };
  70
  71 void _init(void)
  72 {
  73         register_target(&IPV4OPTSSTRIP);
  74 }