| /* |
| * 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 = xtables_ip6mask_to_cidr(&a); |
| if (bits < 0) |
| printf("/%s", xtables_ip6addr_to_numeric(&a)); |
| else |
| printf("/%d", bits); |
| } |
| |
| static void NETMAP_print(const void *ip, const struct xt_entry_target *target, |
| int numeric) |
| { |
| printf(" to:"); |
| __NETMAP_print(ip, target, numeric); |
| } |
| |
| 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); |
| } |