/* Shared library add-on to ip6tables to add customized REJECT support.

 *

 * (C) 2000 Jozsef Kadlecsik <kadlec@blackhole.kfki.hu>

 * 

 * ported to IPv6 by Harald Welte <laforge@gnumonks.org>

 *

 */

#include <stdio.h>

#include <string.h>

#include <xtables.h>

#include <linux/netfilter_ipv6/ip6t_REJECT.h>

struct reject_names {

	const char *name;

	const char *alias;

	const char *desc;

	const char *xlate;

};

enum {

	O_REJECT_WITH = 0,

};

static const struct reject_names reject_table[] = {

	[IP6T_ICMP6_NO_ROUTE] = {

		"icmp6-no-route", "no-route",

		"ICMPv6 no route",

		"no-route",

	},

	[IP6T_ICMP6_ADM_PROHIBITED] = {

		"icmp6-adm-prohibited", "adm-prohibited",

		"ICMPv6 administratively prohibited",

		"admin-prohibited",

	},

#if 0

	[IP6T_ICMP6_NOT_NEIGHBOR] = {

		"icmp6-not-neighbor", "not-neighbor",

		"ICMPv6 not a neighbor",

	},

#endif

	[IP6T_ICMP6_ADDR_UNREACH] = {

		"icmp6-addr-unreachable", "addr-unreach",

		"ICMPv6 address unreachable",

		"addr-unreachable",

	},

	[IP6T_ICMP6_PORT_UNREACH] = {

		"icmp6-port-unreachable", "port-unreach",

		"ICMPv6 port unreachable",

		"port-unreachable",

	},

#if 0

	[IP6T_ICMP6_ECHOREPLY] = {},

#endif

	[IP6T_TCP_RESET] = {

		"tcp-reset", "tcp-reset",

		"TCP RST packet",

		"tcp reset",

	},

	[IP6T_ICMP6_POLICY_FAIL] = {

		"icmp6-policy-fail", "policy-fail",

		"ICMPv6 policy fail",

		"policy-fail",

	},

	[IP6T_ICMP6_REJECT_ROUTE] = {

		"icmp6-reject-route", "reject-route",

		"ICMPv6 reject route",

		"reject-route",

	},

};

static void

print_reject_types(void)

{

	unsigned int i;

	printf("Valid reject types:\n");

	for (i = 0; i < ARRAY_SIZE(reject_table); ++i) {

		if (!reject_table[i].name)

			continue;

		printf("    %-25s\t%s\n", reject_table[i].name, reject_table[i].desc);

		printf("    %-25s\talias\n", reject_table[i].alias);

	}

	printf("\n");

}

static void REJECT_help(void)

{

	printf(

"REJECT target options:\n"

"--reject-with type              drop input packet and send back\n"

"                                a reply packet according to type:\n");

	print_reject_types();

}

static const struct xt_option_entry REJECT_opts[] = {

	{.name = "reject-with", .id = O_REJECT_WITH, .type = XTTYPE_STRING},

	XTOPT_TABLEEND,

};

static void REJECT_init(struct xt_entry_target *t)

{

	struct ip6t_reject_info *reject = (struct ip6t_reject_info *)t->data;

	/* default */

	reject->with = IP6T_ICMP6_PORT_UNREACH;

}

static void REJECT_parse(struct xt_option_call *cb)

{

	struct ip6t_reject_info *reject = cb->data;

	unsigned int i;

	xtables_option_parse(cb);

	for (i = 0; i < ARRAY_SIZE(reject_table); ++i) {

		if (!reject_table[i].name)

			continue;

		if (strncasecmp(reject_table[i].name,

		      cb->arg, strlen(cb->arg)) == 0 ||

		    strncasecmp(reject_table[i].alias,

		      cb->arg, strlen(cb->arg)) == 0) {

			reject->with = i;

			return;

		}

	}

	xtables_error(PARAMETER_PROBLEM,

		"unknown reject type \"%s\"", cb->arg);

}

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

                         int numeric)

{

	const struct ip6t_reject_info *reject

		= (const struct ip6t_reject_info *)target->data;

	printf(" reject-with %s", reject_table[reject->with].name);

}

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

{

	const struct ip6t_reject_info *reject

		= (const struct ip6t_reject_info *)target->data;

	printf(" --reject-with %s", reject_table[reject->with].name);

}

static int REJECT_xlate(struct xt_xlate *xl,

			const struct xt_xlate_tg_params *params)

{

	const struct ip6t_reject_info *reject =

		(const struct ip6t_reject_info *)params->target->data;

	if (reject->with == IP6T_ICMP6_PORT_UNREACH)

		xt_xlate_add(xl, "reject");

	else if (reject->with == IP6T_TCP_RESET)

		xt_xlate_add(xl, "reject with %s",

			     reject_table[reject->with].xlate);

	else

		xt_xlate_add(xl, "reject with icmpv6 type %s",

			     reject_table[reject->with].xlate);

	return 1;

}

static struct xtables_target reject_tg6_reg = {

	.name = "REJECT",

	.version	= XTABLES_VERSION,

	.family		= NFPROTO_IPV6,

	.size 		= XT_ALIGN(sizeof(struct ip6t_reject_info)),

	.userspacesize 	= XT_ALIGN(sizeof(struct ip6t_reject_info)),

	.help		= REJECT_help,

	.init		= REJECT_init,

	.print		= REJECT_print,

	.save		= REJECT_save,

	.x6_parse	= REJECT_parse,

	.x6_options	= REJECT_opts,

	.xlate		= REJECT_xlate,

};

void _init(void)

{

	xtables_register_target(&reject_tg6_reg);

}