/*
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* Copyright (c) 2011 Patrick McHardy <kaber@trash.net>
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*
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* Based on Svenning Soerensen's IPv4 NETMAP target. Development of IPv6 NAT
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* funded by Astaro.
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*/
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#include <stdio.h>
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#include <netdb.h>
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#include <string.h>
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#include <stdlib.h>
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#include <getopt.h>
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#include <xtables.h>
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#include <libiptc/libip6tc.h>
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#include <linux/netfilter/nf_nat.h>
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#define MODULENAME "NETMAP"
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enum {
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O_TO = 0,
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};
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static const struct xt_option_entry NETMAP_opts[] = {
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{.name = "to", .id = O_TO, .type = XTTYPE_HOSTMASK,
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.flags = XTOPT_MAND},
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XTOPT_TABLEEND,
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};
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static void NETMAP_help(void)
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{
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printf(MODULENAME" target options:\n"
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" --%s address[/mask]\n"
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" Network address to map to.\n\n",
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NETMAP_opts[0].name);
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}
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static void NETMAP_parse(struct xt_option_call *cb)
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{
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struct nf_nat_range *range = cb->data;
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unsigned int i;
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xtables_option_parse(cb);
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range->flags |= NF_NAT_RANGE_MAP_IPS;
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for (i = 0; i < 4; i++) {
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range->min_addr.ip6[i] = cb->val.haddr.ip6[i] &
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cb->val.hmask.ip6[i];
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range->max_addr.ip6[i] = range->min_addr.ip6[i] |
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~cb->val.hmask.ip6[i];
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}
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}
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static void __NETMAP_print(const void *ip, const struct xt_entry_target *target,
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int numeric)
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{
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const struct nf_nat_range *r = (const void *)target->data;
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struct in6_addr a;
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unsigned int i;
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int bits;
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a = r->min_addr.in6;
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printf("%s", xtables_ip6addr_to_numeric(&a));
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for (i = 0; i < 4; i++)
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a.s6_addr32[i] = ~(r->min_addr.ip6[i] ^ r->max_addr.ip6[i]);
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bits = xtables_ip6mask_to_cidr(&a);
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if (bits < 0)
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printf("/%s", xtables_ip6addr_to_numeric(&a));
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else
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printf("/%d", bits);
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}
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static void NETMAP_print(const void *ip, const struct xt_entry_target *target,
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int numeric)
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{
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printf(" to:");
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__NETMAP_print(ip, target, numeric);
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}
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static void NETMAP_save(const void *ip, const struct xt_entry_target *target)
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{
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printf(" --%s ", NETMAP_opts[0].name);
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__NETMAP_print(ip, target, 0);
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}
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static struct xtables_target netmap_tg_reg = {
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.name = MODULENAME,
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.version = XTABLES_VERSION,
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.family = NFPROTO_IPV6,
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.size = XT_ALIGN(sizeof(struct nf_nat_range)),
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.userspacesize = XT_ALIGN(sizeof(struct nf_nat_range)),
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.help = NETMAP_help,
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.x6_parse = NETMAP_parse,
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.print = NETMAP_print,
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.save = NETMAP_save,
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.x6_options = NETMAP_opts,
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};
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void _init(void)
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{
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xtables_register_target(&netmap_tg_reg);
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}
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