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/*
* Copyright (c) 2012-2013 Patrick McHardy <kaber@trash.net>
*/
#include <stdio.h>
#include <string.h>
#include <xtables.h>
#include <linux/netfilter_ipv6/ip6_tables.h>
#include <linux/netfilter_ipv6/ip6t_NPT.h>
enum {
O_SRC_PFX = 1 << 0,
O_DST_PFX = 1 << 1,
};
static const struct xt_option_entry DNPT_options[] = {
{ .name = "src-pfx", .id = O_SRC_PFX, .type = XTTYPE_HOSTMASK,
.flags = XTOPT_MAND },
{ .name = "dst-pfx", .id = O_DST_PFX, .type = XTTYPE_HOSTMASK,
.flags = XTOPT_MAND },
{ }
};
static void DNPT_help(void)
{
printf("DNPT target options:"
"\n"
" --src-pfx prefix/length\n"
" --dst-pfx prefix/length\n"
"\n");
}
static void DNPT_parse(struct xt_option_call *cb)
{
struct ip6t_npt_tginfo *npt = cb->data;
xtables_option_parse(cb);
switch (cb->entry->id) {
case O_SRC_PFX:
npt->src_pfx = cb->val.haddr;
npt->src_pfx_len = cb->val.hlen;
break;
case O_DST_PFX:
npt->dst_pfx = cb->val.haddr;
npt->dst_pfx_len = cb->val.hlen;
break;
}
}
static void DNPT_print(const void *ip, const struct xt_entry_target *target,
int numeric)
{
const struct ip6t_npt_tginfo *npt = (const void *)target->data;
printf("src-pfx %s/%u ", xtables_ip6addr_to_numeric(&npt->src_pfx.in6),
npt->src_pfx_len);
printf("dst-pfx %s/%u ", xtables_ip6addr_to_numeric(&npt->dst_pfx.in6),
npt->dst_pfx_len);
}
static void DNPT_save(const void *ip, const struct xt_entry_target *target)
{
static const struct in6_addr zero_addr;
const struct ip6t_npt_tginfo *info = (const void *)target->data;
if (memcmp(&info->src_pfx.in6, &zero_addr, sizeof(zero_addr)) != 0 ||
info->src_pfx_len != 0)
printf("--src-pfx %s/%u ",
xtables_ip6addr_to_numeric(&info->src_pfx.in6),
info->src_pfx_len);
if (memcmp(&info->dst_pfx.in6, &zero_addr, sizeof(zero_addr)) != 0 ||
info->dst_pfx_len != 0)
printf("--dst-pfx %s/%u ",
xtables_ip6addr_to_numeric(&info->dst_pfx.in6),
info->dst_pfx_len);
}
static struct xtables_target snpt_tg_reg = {
.name = "DNPT",
.version = XTABLES_VERSION,
.family = NFPROTO_IPV6,
.size = XT_ALIGN(sizeof(struct ip6t_npt_tginfo)),
.userspacesize = offsetof(struct ip6t_npt_tginfo, adjustment),
.help = DNPT_help,
.x6_parse = DNPT_parse,
.print = DNPT_print,
.save = DNPT_save,
.x6_options = DNPT_options,
};
void _init(void)
{
xtables_register_target(&snpt_tg_reg);
}
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