diff options
Diffstat (limited to 'extensions/libip6t_MASQUERADE.c')
| -rw-r--r-- | extensions/libip6t_MASQUERADE.c | 188 |
1 files changed, 0 insertions, 188 deletions
diff --git a/extensions/libip6t_MASQUERADE.c b/extensions/libip6t_MASQUERADE.c deleted file mode 100644 index f28f071b..00000000 --- a/extensions/libip6t_MASQUERADE.c +++ /dev/null @@ -1,188 +0,0 @@ -/* - * Copyright (c) 2011 Patrick McHardy <kaber@trash.net> - * - * Based on Rusty Russell's IPv4 MASQUERADE 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 <limits.h> /* INT_MAX in ip_tables.h */ -#include <linux/netfilter_ipv6/ip6_tables.h> -#include <linux/netfilter/nf_nat.h> - -enum { - O_TO_PORTS = 0, - O_RANDOM, - O_RANDOM_FULLY, -}; - -static void MASQUERADE_help(void) -{ - printf( -"MASQUERADE target options:\n" -" --to-ports <port>[-<port>]\n" -" Port (range) to map to.\n" -" --random\n" -" Randomize source port.\n" -" --random-fully\n" -" Fully randomize source port.\n"); -} - -static const struct xt_option_entry MASQUERADE_opts[] = { - {.name = "to-ports", .id = O_TO_PORTS, .type = XTTYPE_STRING}, - {.name = "random", .id = O_RANDOM, .type = XTTYPE_NONE}, - {.name = "random-fully", .id = O_RANDOM_FULLY, .type = XTTYPE_NONE}, - XTOPT_TABLEEND, -}; - -/* Parses ports */ -static void -parse_ports(const char *arg, struct nf_nat_range *r) -{ - char *end; - unsigned int port, maxport; - - r->flags |= NF_NAT_RANGE_PROTO_SPECIFIED; - - if (!xtables_strtoui(arg, &end, &port, 0, UINT16_MAX)) - xtables_param_act(XTF_BAD_VALUE, "MASQUERADE", "--to-ports", arg); - - switch (*end) { - case '\0': - r->min_proto.tcp.port - = r->max_proto.tcp.port - = htons(port); - return; - case '-': - if (!xtables_strtoui(end + 1, NULL, &maxport, 0, UINT16_MAX)) - break; - - if (maxport < port) - break; - - r->min_proto.tcp.port = htons(port); - r->max_proto.tcp.port = htons(maxport); - return; - default: - break; - } - xtables_param_act(XTF_BAD_VALUE, "MASQUERADE", "--to-ports", arg); -} - -static void MASQUERADE_parse(struct xt_option_call *cb) -{ - const struct ip6t_entry *entry = cb->xt_entry; - struct nf_nat_range *r = cb->data; - int portok; - - if (entry->ipv6.proto == IPPROTO_TCP || - entry->ipv6.proto == IPPROTO_UDP || - entry->ipv6.proto == IPPROTO_SCTP || - entry->ipv6.proto == IPPROTO_DCCP || - entry->ipv6.proto == IPPROTO_ICMP) - portok = 1; - else - portok = 0; - - xtables_option_parse(cb); - switch (cb->entry->id) { - case O_TO_PORTS: - if (!portok) - xtables_error(PARAMETER_PROBLEM, - "Need TCP, UDP, SCTP or DCCP with port specification"); - parse_ports(cb->arg, r); - break; - case O_RANDOM: - r->flags |= NF_NAT_RANGE_PROTO_RANDOM; - break; - case O_RANDOM_FULLY: - r->flags |= NF_NAT_RANGE_PROTO_RANDOM_FULLY; - break; - } -} - -static void -MASQUERADE_print(const void *ip, const struct xt_entry_target *target, - int numeric) -{ - const struct nf_nat_range *r = (const void *)target->data; - - if (r->flags & NF_NAT_RANGE_PROTO_SPECIFIED) { - printf(" masq ports: "); - printf("%hu", ntohs(r->min_proto.tcp.port)); - if (r->max_proto.tcp.port != r->min_proto.tcp.port) - printf("-%hu", ntohs(r->max_proto.tcp.port)); - } - - if (r->flags & NF_NAT_RANGE_PROTO_RANDOM) - printf(" random"); - - if (r->flags & NF_NAT_RANGE_PROTO_RANDOM_FULLY) - printf(" random-fully"); -} - -static void -MASQUERADE_save(const void *ip, const struct xt_entry_target *target) -{ - const struct nf_nat_range *r = (const void *)target->data; - - if (r->flags & NF_NAT_RANGE_PROTO_SPECIFIED) { - printf(" --to-ports %hu", ntohs(r->min_proto.tcp.port)); - if (r->max_proto.tcp.port != r->min_proto.tcp.port) - printf("-%hu", ntohs(r->max_proto.tcp.port)); - } - - if (r->flags & NF_NAT_RANGE_PROTO_RANDOM) - printf(" --random"); - - if (r->flags & NF_NAT_RANGE_PROTO_RANDOM_FULLY) - printf(" --random-fully"); -} - -static int MASQUERADE_xlate(struct xt_xlate *xl, - const struct xt_xlate_tg_params *params) -{ - const struct nf_nat_range *r = (const void *)params->target->data; - - xt_xlate_add(xl, "masquerade"); - - if (r->flags & NF_NAT_RANGE_PROTO_SPECIFIED) { - xt_xlate_add(xl, " to :%hu", ntohs(r->min_proto.tcp.port)); - if (r->max_proto.tcp.port != r->min_proto.tcp.port) - xt_xlate_add(xl, "-%hu", ntohs(r->max_proto.tcp.port)); - } - - xt_xlate_add(xl, " "); - if (r->flags & NF_NAT_RANGE_PROTO_RANDOM) - xt_xlate_add(xl, "random "); - - xt_xlate_add(xl, " "); - if (r->flags & NF_NAT_RANGE_PROTO_RANDOM_FULLY) - xt_xlate_add(xl, "fully-random "); - - return 1; -} - -static struct xtables_target masquerade_tg_reg = { - .name = "MASQUERADE", - .version = XTABLES_VERSION, - .family = NFPROTO_IPV6, - .size = XT_ALIGN(sizeof(struct nf_nat_range)), - .userspacesize = XT_ALIGN(sizeof(struct nf_nat_range)), - .help = MASQUERADE_help, - .x6_parse = MASQUERADE_parse, - .print = MASQUERADE_print, - .save = MASQUERADE_save, - .x6_options = MASQUERADE_opts, - .xlate = MASQUERADE_xlate, -}; - -void _init(void) -{ - xtables_register_target(&masquerade_tg_reg); -} |