/* 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);

}