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/*
* "TEE" target extension for iptables
* Copyright © Sebastian Claßen <sebastian.classen [at] freenet.ag>, 2007
* Jan Engelhardt <jengelh [at] medozas de>, 2007 - 2010
*
* This program is free software; you can redistribute it and/or
* modify it under the terms of the GNU General Public License; either
* version 2 of the License, or any later version, as published by the
* Free Software Foundation.
*/
#include <sys/socket.h>
#include <getopt.h>
#include <stdbool.h>
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <arpa/inet.h>
#include <net/if.h>
#include <netinet/in.h>
#include <xtables.h>
#include <linux/netfilter.h>
#include <linux/netfilter/x_tables.h>
#include <linux/netfilter/xt_TEE.h>
enum {
O_GATEWAY = 0,
O_OIF,
};
#define s struct xt_tee_tginfo
static const struct xt_option_entry tee_tg_opts[] = {
{.name = "gateway", .id = O_GATEWAY, .type = XTTYPE_HOST,
.flags = XTOPT_MAND | XTOPT_PUT, XTOPT_POINTER(s, gw)},
{.name = "oif", .id = O_OIF, .type = XTTYPE_STRING,
.flags = XTOPT_PUT, XTOPT_POINTER(s, oif)},
XTOPT_TABLEEND,
};
#undef s
static void tee_tg_help(void)
{
printf(
"TEE target options:\n"
" --gateway IPADDR Route packet via the gateway given by address\n"
" --oif NAME Include oif in route calculation\n"
"\n");
}
static void tee_tg_print(const void *ip, const struct xt_entry_target *target,
int numeric)
{
const struct xt_tee_tginfo *info = (const void *)target->data;
if (numeric)
printf(" TEE gw:%s", xtables_ipaddr_to_numeric(&info->gw.in));
else
printf(" TEE gw:%s", xtables_ipaddr_to_anyname(&info->gw.in));
if (*info->oif != '\0')
printf(" oif=%s", info->oif);
}
static void tee_tg6_print(const void *ip, const struct xt_entry_target *target,
int numeric)
{
const struct xt_tee_tginfo *info = (const void *)target->data;
if (numeric)
printf(" TEE gw:%s", xtables_ip6addr_to_numeric(&info->gw.in6));
else
printf(" TEE gw:%s", xtables_ip6addr_to_anyname(&info->gw.in6));
if (*info->oif != '\0')
printf(" oif=%s", info->oif);
}
static void tee_tg_save(const void *ip, const struct xt_entry_target *target)
{
const struct xt_tee_tginfo *info = (const void *)target->data;
printf(" --gateway %s", xtables_ipaddr_to_numeric(&info->gw.in));
if (*info->oif != '\0')
printf(" --oif %s", info->oif);
}
static void tee_tg6_save(const void *ip, const struct xt_entry_target *target)
{
const struct xt_tee_tginfo *info = (const void *)target->data;
printf(" --gateway %s", xtables_ip6addr_to_numeric(&info->gw.in6));
if (*info->oif != '\0')
printf(" --oif %s", info->oif);
}
static int tee_tg_xlate(struct xt_xlate *xl,
const struct xt_xlate_tg_params *params)
{
const struct xt_tee_tginfo *info = (const void *)params->target->data;
if (params->numeric)
xt_xlate_add(xl, "dup to %s",
xtables_ipaddr_to_numeric(&info->gw.in));
else
xt_xlate_add(xl, "dup to %s",
xtables_ipaddr_to_anyname(&info->gw.in));
if (*info->oif != '\0')
xt_xlate_add(xl, " device %s", info->oif);
return 1;
}
static int tee_tg6_xlate(struct xt_xlate *xl,
const struct xt_xlate_tg_params *params)
{
const struct xt_tee_tginfo *info = (const void *)params->target->data;
if (params->numeric)
xt_xlate_add(xl, "dup to %s",
xtables_ip6addr_to_numeric(&info->gw.in6));
else
xt_xlate_add(xl, "dup to %s",
xtables_ip6addr_to_anyname(&info->gw.in6));
if (*info->oif != '\0')
xt_xlate_add(xl, " device %s", info->oif);
return 1;
}
static struct xtables_target tee_tg_reg[] = {
{
.name = "TEE",
.version = XTABLES_VERSION,
.revision = 1,
.family = NFPROTO_IPV4,
.size = XT_ALIGN(sizeof(struct xt_tee_tginfo)),
.userspacesize = offsetof(struct xt_tee_tginfo, priv),
.help = tee_tg_help,
.print = tee_tg_print,
.save = tee_tg_save,
.x6_parse = xtables_option_parse,
.x6_options = tee_tg_opts,
.xlate = tee_tg_xlate,
},
{
.name = "TEE",
.version = XTABLES_VERSION,
.revision = 1,
.family = NFPROTO_IPV6,
.size = XT_ALIGN(sizeof(struct xt_tee_tginfo)),
.userspacesize = offsetof(struct xt_tee_tginfo, priv),
.help = tee_tg_help,
.print = tee_tg6_print,
.save = tee_tg6_save,
.x6_parse = xtables_option_parse,
.x6_options = tee_tg_opts,
.xlate = tee_tg6_xlate,
},
};
void _init(void)
{
xtables_register_targets(tee_tg_reg, ARRAY_SIZE(tee_tg_reg));
}
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