/*

 * Shared library add-on to iptables to add quota support

 *

 * Sam Johnston <samj@samj.net>

 */

#include <stdio.h>

#include <xtables.h>

#include <linux/netfilter/xt_quota.h>

enum {

	O_QUOTA = 0,

};

static const struct xt_option_entry quota_opts[] = {

	{.name = "quota", .id = O_QUOTA, .type = XTTYPE_UINT64,

	 .flags = XTOPT_MAND | XTOPT_INVERT | XTOPT_PUT,

	 XTOPT_POINTER(struct xt_quota_info, quota)},

	XTOPT_TABLEEND,

};

static void quota_help(void)

{

	printf("quota match options:\n"

	       "[!] --quota quota		quota (bytes)\n");

}

static void

quota_print(const void *ip, const struct xt_entry_match *match, int numeric)

{

	const struct xt_quota_info *q = (const void *)match->data;

	printf(" quota: %llu bytes", (unsigned long long)q->quota);

}

static void

quota_save(const void *ip, const struct xt_entry_match *match)

{

	const struct xt_quota_info *q = (const void *)match->data;

	if (q->flags & XT_QUOTA_INVERT)

		printf(" !");

	printf(" --quota %llu", (unsigned long long) q->quota);

}

static void quota_parse(struct xt_option_call *cb)

{

	struct xt_quota_info *info = cb->data;

	xtables_option_parse(cb);

	if (cb->invert)

		info->flags |= XT_QUOTA_INVERT;

}

static int quota_xlate(struct xt_xlate *xl,

		       const struct xt_xlate_mt_params *params)

{

	const struct xt_quota_info *q = (void *)params->match->data;

	xt_xlate_add(xl, "quota %s%llu bytes",

		     q->flags & XT_QUOTA_INVERT ? "over " : "",

		     (unsigned long long) q->quota);

	return 1;

}

static struct xtables_match quota_match = {

	.family		= NFPROTO_UNSPEC,

	.name		= "quota",

	.version	= XTABLES_VERSION,

	.size		= XT_ALIGN(sizeof (struct xt_quota_info)),

	.userspacesize	= offsetof(struct xt_quota_info, master),

	.help		= quota_help,

	.print		= quota_print,

	.save		= quota_save,

	.x6_parse	= quota_parse,

	.x6_options	= quota_opts,

	.xlate		= quota_xlate,

};

void

_init(void)

{

	xtables_register_match(&quota_match);

}