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/* 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;
enum ip6t_reject_with with;
const char *desc;
};
enum {
O_REJECT_WITH = 0,
};
static const struct reject_names reject_table[] = {
{"icmp6-no-route", "no-route",
IP6T_ICMP6_NO_ROUTE, "ICMPv6 no route"},
{"icmp6-adm-prohibited", "adm-prohibited",
IP6T_ICMP6_ADM_PROHIBITED, "ICMPv6 administratively prohibited"},
#if 0
{"icmp6-not-neighbor", "not-neighbor"},
IP6T_ICMP6_NOT_NEIGHBOR, "ICMPv6 not a neighbor"},
#endif
{"icmp6-addr-unreachable", "addr-unreach",
IP6T_ICMP6_ADDR_UNREACH, "ICMPv6 address unreachable"},
{"icmp6-port-unreachable", "port-unreach",
IP6T_ICMP6_PORT_UNREACH, "ICMPv6 port unreachable"},
{"tcp-reset", "tcp-reset",
IP6T_TCP_RESET, "TCP RST packet"},
{"icmp6-policy-fail", "policy-fail",
IP6T_ICMP6_POLICY_FAIL, "ICMPv6 policy fail"},
{"icmp6-reject-route", "reject-route",
IP6T_ICMP6_REJECT_ROUTE, "ICMPv6 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) {
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 (strncasecmp(reject_table[i].name,
cb->arg, strlen(cb->arg)) == 0 ||
strncasecmp(reject_table[i].alias,
cb->arg, strlen(cb->arg)) == 0) {
reject->with = reject_table[i].with;
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;
unsigned int i;
for (i = 0; i < ARRAY_SIZE(reject_table); ++i)
if (reject_table[i].with == reject->with)
break;
printf(" reject-with %s", reject_table[i].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;
unsigned int i;
for (i = 0; i < ARRAY_SIZE(reject_table); ++i)
if (reject_table[i].with == reject->with)
break;
printf(" --reject-with %s", reject_table[i].name);
}
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,
};
void _init(void)
{
xtables_register_target(&reject_tg6_reg);
}
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