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100 lines
2.3 KiB
100 lines
2.3 KiB
/* |
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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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