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/* Shared library add-on to iptables 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 <stdlib.h>
#include <getopt.h>
#include <ip6tables.h>
#include <linux/netfilter_ipv6/ip6_tables.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;
};
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"}
};
static void
print_reject_types()
{
unsigned int i;
printf("Valid reject types:\n");
for (i = 0; i < sizeof(reject_table)/sizeof(struct reject_names); i++) {
printf(" %-25s\t%s\n", reject_table[i].name, reject_table[i].desc);
printf(" %-25s\talias\n", reject_table[i].alias);
}
printf("\n");
}
/* Saves the union ipt_targinfo in parsable form to stdout. */
/* Function which prints out usage message. */
static void
help(void)
{
printf(
"REJECT options:\n"
"--reject-with type drop input packet and send back\n"
" a reply packet according to type:\n");
print_reject_types();
}
static struct option opts[] = {
{ "reject-with", 1, 0, '1' },
{ 0 }
};
/* Allocate and initialize the target. */
static void
init(struct ip6t_entry_target *t, unsigned int *nfcache)
{
struct ip6t_reject_info *reject = (struct ip6t_reject_info *)t->data;
/* default */
reject->with = IP6T_ICMP6_PORT_UNREACH;
/* Can't cache this */
*nfcache |= NFC_UNKNOWN;
}
/* 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 ip6t_entry *entry,
struct ip6t_entry_target **target)
{
struct ip6t_reject_info *reject =
(struct ip6t_reject_info *)(*target)->data;
unsigned int limit = sizeof(reject_table)/sizeof(struct reject_names);
unsigned int i;
switch(c) {
case '1':
if (check_inverse(optarg, &invert, NULL, 0))
exit_error(PARAMETER_PROBLEM,
"Unexpected `!' after --reject-with");
for (i = 0; i < limit; i++) {
if ((strncasecmp(reject_table[i].name, optarg, strlen(optarg)) == 0)
|| (strncasecmp(reject_table[i].alias, optarg, strlen(optarg)) == 0)) {
reject->with = reject_table[i].with;
return 1;
}
}
exit_error(PARAMETER_PROBLEM, "unknown reject type `%s'",optarg);
default:
/* Fall through */
break;
}
return 0;
}
/* Final check; nothing. */
static void final_check(unsigned int flags)
{
}
/* Prints out ipt_reject_info. */
static void
print(const struct ip6t_ip6 *ip,
const struct ip6t_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 < sizeof(reject_table)/sizeof(struct reject_names); i++) {
if (reject_table[i].with == reject->with)
break;
}
printf("reject-with %s ", reject_table[i].name);
}
/* Saves ipt_reject in parsable form to stdout. */
static void save(const struct ip6t_ip6 *ip,
const struct ip6t_entry_target *target)
{
const struct ip6t_reject_info *reject
= (const struct ip6t_reject_info *)target->data;
unsigned int i;
for (i = 0; i < sizeof(reject_table)/sizeof(struct reject_names); i++)
if (reject_table[i].with == reject->with)
break;
printf("--reject-with %s ", reject_table[i].name);
}
struct ip6tables_target reject
= { NULL,
"REJECT",
IPTABLES_VERSION,
IP6T_ALIGN(sizeof(struct ip6t_reject_info)),
IP6T_ALIGN(sizeof(struct ip6t_reject_info)),
&help,
&init,
&parse,
&final_check,
&print,
&save,
opts
};
void _init(void)
{
register_target6(&reject);
}
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