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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 {
FLAG_GATEWAY = 1 << 0,
FLAG_OIF = 1 << 1,
};
static const struct option tee_tg_opts[] = {
{.name = "gateway", .has_arg = true, .val = 'g'},
{.name = "oif", .has_arg = true, .val = 'o'},
{NULL},
};
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 int tee_tg_parse(int c, char **argv, int invert, unsigned int *flags,
const void *entry, struct xt_entry_target **target)
{
struct xt_tee_tginfo *info = (void *)(*target)->data;
const struct in_addr *ia;
switch (c) {
case 'g':
if (*flags & FLAG_GATEWAY)
xtables_error(PARAMETER_PROBLEM,
"Cannot specify --gateway more than once");
ia = xtables_numeric_to_ipaddr(optarg);
if (ia == NULL)
xtables_error(PARAMETER_PROBLEM,
"Invalid IP address %s", optarg);
memcpy(&info->gw, ia, sizeof(*ia));
*flags |= FLAG_GATEWAY;
return true;
case 'o':
if (*flags & FLAG_OIF)
xtables_error(PARAMETER_PROBLEM,
"Cannot specify --oif more than once");
if (strlen(optarg) >= sizeof(info->oif))
xtables_error(PARAMETER_PROBLEM,
"oif name too long");
strcpy(info->oif, optarg);
*flags |= FLAG_OIF;
return true;
}
return false;
}
static int tee_tg6_parse(int c, char **argv, int invert, unsigned int *flags,
const void *entry, struct xt_entry_target **target)
{
struct xt_tee_tginfo *info = (void *)(*target)->data;
const struct in6_addr *ia;
switch (c) {
case 'g':
if (*flags & FLAG_GATEWAY)
xtables_error(PARAMETER_PROBLEM,
"Cannot specify --gateway more than once");
ia = xtables_numeric_to_ip6addr(optarg);
if (ia == NULL)
xtables_error(PARAMETER_PROBLEM,
"Invalid IP address %s", optarg);
memcpy(&info->gw, ia, sizeof(*ia));
*flags |= FLAG_GATEWAY;
return true;
case 'o':
if (*flags & FLAG_OIF)
xtables_error(PARAMETER_PROBLEM,
"Cannot specify --oif more than once");
if (strlen(optarg) >= sizeof(info->oif))
xtables_error(PARAMETER_PROBLEM,
"oif name too long");
strcpy(info->oif, optarg);
*flags |= FLAG_OIF;
return true;
}
return false;
}
static void tee_tg_check(unsigned int flags)
{
if (flags == 0)
xtables_error(PARAMETER_PROBLEM, "TEE target: "
"--gateway parameter required");
}
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 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 = XT_ALIGN(sizeof(struct xt_tee_tginfo)),
.help = tee_tg_help,
.parse = tee_tg_parse,
.final_check = tee_tg_check,
.print = tee_tg_print,
.save = tee_tg_save,
.extra_opts = tee_tg_opts,
};
static struct xtables_target tee_tg6_reg = {
.name = "TEE",
.version = XTABLES_VERSION,
.revision = 1,
.family = NFPROTO_IPV6,
.size = XT_ALIGN(sizeof(struct xt_tee_tginfo)),
.userspacesize = XT_ALIGN(sizeof(struct xt_tee_tginfo)),
.help = tee_tg_help,
.parse = tee_tg6_parse,
.final_check = tee_tg_check,
.print = tee_tg6_print,
.save = tee_tg6_save,
.extra_opts = tee_tg_opts,
};
void _init(void)
{
xtables_register_target(&tee_tg_reg);
xtables_register_target(&tee_tg6_reg);
}
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