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/* 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: libipt_ECN.c,v 1.1 2002/02/17 21:32:32 laforge Exp $
*/
#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 *einfo
= (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);
}
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