#include <stdio.h>
#include <asm/types.h>
#include <stdlib.h>
#include <getopt.h>

#include <iptables.h>
#include <linux/netfilter_ipv4/ip_tables.h>
#include <linux/netfilter_ipv4/ipt_ACC.h>

struct accinfo {
	struct ipt_entry_target t;
	struct ipt_acc_target_info mark;
};

/* Function which prints out usage message. */
static void
help(void)
{
	printf(
"ACC target v%s options:\n"
"  --mark value                   Set mark value\n"
"\n",
IPTABLES_VERSION);
}

static struct option opts[] = {
	{ "mark", 2, 0, '1' },
	{ 0 }
};

/* Initialize the target. */
static void
init(struct ipt_entry_target *t, unsigned int *nfcache)
{
}

/* Function which parses command options; returns true if it
   ate an option */
static int
parse(int c, char **argv, int invert, unsigned int *flags,
      const struct ipt_entry *entry,
      struct ipt_entry_target **target)
{
	struct ipt_acc_target_info *accinfo
		= (struct ipt_acc_target_info *)(*target)->data;
	char	*end;
	if( c == '1' ) {
		accinfo->mark = strtoul(optarg, &end, 0);
		if (*end != '\0' || end == optarg)
			exit_error(PARAMETER_PROBLEM, "Bad mark value `%s'", optarg);
		if (*flags)
			exit_error(PARAMETER_PROBLEM,
				"ACC target: Can't specify --mark twice");
		*flags = 1;
		return 1;
	}
	return 0;
}

static void
final_check(unsigned int flags)
{
	if (!flags)
		exit_error(PARAMETER_PROBLEM,
		           "ACC target: Parameter --mark is required");
}

static void
print_mark(unsigned long mark, int numeric)
{
	printf("0x%lx ", mark);
}

/* Prints out the targinfo. */
static void
print(const struct ipt_ip *ip,
      const struct ipt_entry_target *target,
      int numeric)
{
	const struct ipt_acc_target_info *accinfo =
		(const struct ipt_acc_target_info *)target->data;
	printf("MARK set ");
	print_mark(accinfo->mark, numeric);
}

/* 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_acc_target_info *accinfo =
		(const struct ipt_acc_target_info *)target->data;

	printf("--mark 0x%lx ", accinfo->mark);
}

struct iptables_target acc
= { NULL,
    "ACC",
    IPTABLES_VERSION,
    IPT_ALIGN(sizeof(struct ipt_acc_target_info)),
    IPT_ALIGN(sizeof(struct ipt_acc_target_info)),
    &help,
    &init,
    &parse,
    &final_check,
    &print,
    &save,
    opts
};

void _init(void)
{
	register_target(&acc);
}