/* Shared library add-on to xtables for CHECKSUM
|
*
|
* (C) 2002 by Harald Welte <laforge@gnumonks.org>
|
* (C) 2010 by Red Hat, Inc
|
* Author: Michael S. Tsirkin <mst@redhat.com>
|
*
|
* This program is distributed under the terms of GNU GPL v2, 1991
|
*
|
* libxt_CHECKSUM.c borrowed some bits from libipt_ECN.c
|
*/
|
#include <stdio.h>
|
#include <xtables.h>
|
#include <linux/netfilter/xt_CHECKSUM.h>
|
|
enum {
|
O_CHECKSUM_FILL = 0,
|
};
|
|
static void CHECKSUM_help(void)
|
{
|
printf(
|
"CHECKSUM target options\n"
|
" --checksum-fill Fill in packet checksum.\n");
|
}
|
|
static const struct xt_option_entry CHECKSUM_opts[] = {
|
{.name = "checksum-fill", .id = O_CHECKSUM_FILL,
|
.flags = XTOPT_MAND, .type = XTTYPE_NONE},
|
XTOPT_TABLEEND,
|
};
|
|
static void CHECKSUM_parse(struct xt_option_call *cb)
|
{
|
struct xt_CHECKSUM_info *einfo = cb->data;
|
|
xtables_option_parse(cb);
|
einfo->operation = XT_CHECKSUM_OP_FILL;
|
}
|
|
static void CHECKSUM_print(const void *ip, const struct xt_entry_target *target,
|
int numeric)
|
{
|
const struct xt_CHECKSUM_info *einfo =
|
(const struct xt_CHECKSUM_info *)target->data;
|
|
printf(" CHECKSUM");
|
|
if (einfo->operation & XT_CHECKSUM_OP_FILL)
|
printf(" fill");
|
}
|
|
static void CHECKSUM_save(const void *ip, const struct xt_entry_target *target)
|
{
|
const struct xt_CHECKSUM_info *einfo =
|
(const struct xt_CHECKSUM_info *)target->data;
|
|
if (einfo->operation & XT_CHECKSUM_OP_FILL)
|
printf(" --checksum-fill");
|
}
|
|
static struct xtables_target checksum_tg_reg = {
|
.name = "CHECKSUM",
|
.version = XTABLES_VERSION,
|
.family = NFPROTO_UNSPEC,
|
.size = XT_ALIGN(sizeof(struct xt_CHECKSUM_info)),
|
.userspacesize = XT_ALIGN(sizeof(struct xt_CHECKSUM_info)),
|
.help = CHECKSUM_help,
|
.print = CHECKSUM_print,
|
.save = CHECKSUM_save,
|
.x6_parse = CHECKSUM_parse,
|
.x6_options = CHECKSUM_opts,
|
};
|
|
void _init(void)
|
{
|
xtables_register_target(&checksum_tg_reg);
|
}
|
