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/* 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);
}
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