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/*
* Copyright (c) 2011 Patrick McHardy <kaber@trash.net>
*
* Based on Svenning Soerensen's IPv4 NETMAP target. Development of IPv6 NAT
* funded by Astaro.
*/
#include <stdio.h>
#include <netdb.h>
#include <string.h>
#include <stdlib.h>
#include <getopt.h>
#include <xtables.h>
#include <libiptc/libip6tc.h>
#include <linux/netfilter/nf_nat.h>
#define MODULENAME "NETMAP"
enum {
O_TO = 0,
};
static const struct xt_option_entry NETMAP_opts[] = {
{.name = "to", .id = O_TO, .type = XTTYPE_HOSTMASK,
.flags = XTOPT_MAND},
XTOPT_TABLEEND,
};
static void NETMAP_help(void)
{
printf(MODULENAME" target options:\n"
" --%s address[/mask]\n"
" Network address to map to.\n\n",
NETMAP_opts[0].name);
}
static void NETMAP_parse(struct xt_option_call *cb)
{
struct nf_nat_range *range = cb->data;
unsigned int i;
xtables_option_parse(cb);
range->flags |= NF_NAT_RANGE_MAP_IPS;
for (i = 0; i < 4; i++) {
range->min_addr.ip6[i] = cb->val.haddr.ip6[i] &
cb->val.hmask.ip6[i];
range->max_addr.ip6[i] = range->min_addr.ip6[i] |
~cb->val.hmask.ip6[i];
}
}
static void NETMAP_print(const void *ip, const struct xt_entry_target *target,
int numeric)
{
const struct nf_nat_range *r = (const void *)target->data;
struct in6_addr a;
unsigned int i;
int bits;
a = r->min_addr.in6;
printf("%s", xtables_ip6addr_to_numeric(&a));
for (i = 0; i < 4; i++)
a.s6_addr32[i] = ~(r->min_addr.ip6[i] ^ r->max_addr.ip6[i]);
bits = ipv6_prefix_length(&a);
if (bits < 0)
printf("/%s", xtables_ip6addr_to_numeric(&a));
else
printf("/%d", bits);
}
static void NETMAP_save(const void *ip, const struct xt_entry_target *target)
{
printf(" --%s ", NETMAP_opts[0].name);
NETMAP_print(ip, target, 0);
}
static struct xtables_target netmap_tg_reg = {
.name = MODULENAME,
.version = XTABLES_VERSION,
.family = NFPROTO_IPV6,
.size = XT_ALIGN(sizeof(struct nf_nat_range)),
.userspacesize = XT_ALIGN(sizeof(struct nf_nat_range)),
.help = NETMAP_help,
.x6_parse = NETMAP_parse,
.print = NETMAP_print,
.save = NETMAP_save,
.x6_options = NETMAP_opts,
};
void _init(void)
{
xtables_register_target(&netmap_tg_reg);
}
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