/*

 * Copyright (c) 2012-2013 Patrick McHardy <kaber@trash.net>

 */

#include <stdio.h>

#include <string.h>

#include <xtables.h>

#include <linux/netfilter_ipv6/ip6_tables.h>

#include <linux/netfilter_ipv6/ip6t_NPT.h>

enum {

	O_SRC_PFX	= 1 << 0,

	O_DST_PFX	= 1 << 1,

};

static const struct xt_option_entry DNPT_options[] = {

	{ .name = "src-pfx", .id = O_SRC_PFX, .type = XTTYPE_HOSTMASK,

	  .flags = XTOPT_MAND },

	{ .name = "dst-pfx", .id = O_DST_PFX, .type = XTTYPE_HOSTMASK,

	  .flags = XTOPT_MAND },

	{ }

};

static void DNPT_help(void)

{

	printf("DNPT target options:"

	       "\n"

	       " --src-pfx prefix/length\n"

	       " --dst-pfx prefix/length\n"

	       "\n");

}

static void DNPT_parse(struct xt_option_call *cb)

{

	struct ip6t_npt_tginfo *npt = cb->data;

	xtables_option_parse(cb);

	switch (cb->entry->id) {

	case O_SRC_PFX:

		npt->src_pfx = cb->val.haddr;

		npt->src_pfx_len = cb->val.hlen;

		break;

	case O_DST_PFX:

		npt->dst_pfx = cb->val.haddr;

		npt->dst_pfx_len = cb->val.hlen;

		break;

	}

}

static void DNPT_print(const void *ip, const struct xt_entry_target *target,

		       int numeric)

{

	const struct ip6t_npt_tginfo *npt = (const void *)target->data;

	printf(" DNPT src-pfx %s/%u", xtables_ip6addr_to_numeric(&npt->src_pfx.in6),

				 npt->src_pfx_len);

	printf(" dst-pfx %s/%u", xtables_ip6addr_to_numeric(&npt->dst_pfx.in6),

				 npt->dst_pfx_len);

}

static void DNPT_save(const void *ip, const struct xt_entry_target *target)

{

	static const struct in6_addr zero_addr;

	const struct ip6t_npt_tginfo *info = (const void *)target->data;

	if (memcmp(&info->src_pfx.in6, &zero_addr, sizeof(zero_addr)) != 0 ||

	    info->src_pfx_len != 0)

		printf(" --src-pfx %s/%u",

		       xtables_ip6addr_to_numeric(&info->src_pfx.in6),

		       info->src_pfx_len);

	if (memcmp(&info->dst_pfx.in6, &zero_addr, sizeof(zero_addr)) != 0 ||

	    info->dst_pfx_len != 0)

		printf(" --dst-pfx %s/%u",

		       xtables_ip6addr_to_numeric(&info->dst_pfx.in6),

		       info->dst_pfx_len);

}

static struct xtables_target snpt_tg_reg = {

	.name		= "DNPT",

	.version	= XTABLES_VERSION,

	.family		= NFPROTO_IPV6,

	.size		= XT_ALIGN(sizeof(struct ip6t_npt_tginfo)),

	.userspacesize	= offsetof(struct ip6t_npt_tginfo, adjustment),

	.help		= DNPT_help,

	.x6_parse	= DNPT_parse,

	.print		= DNPT_print,

	.save		= DNPT_save,

	.x6_options	= DNPT_options,

};

void _init(void)

{

	xtables_register_target(&snpt_tg_reg);

}