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164 lines
4.5 KiB
164 lines
4.5 KiB
/*
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* "TEE" target extension for iptables
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* Copyright © Sebastian Claßen <sebastian.classen [at] freenet.ag>, 2007
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* Jan Engelhardt <jengelh [at] medozas de>, 2007 - 2010
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*
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* This program is free software; you can redistribute it and/or
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* modify it under the terms of the GNU General Public License; either
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* version 2 of the License, or any later version, as published by the
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* Free Software Foundation.
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*/
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#include <sys/socket.h>
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#include <getopt.h>
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#include <stdbool.h>
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#include <stdio.h>
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#include <stdlib.h>
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#include <string.h>
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#include <arpa/inet.h>
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#include <net/if.h>
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#include <netinet/in.h>
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#include <xtables.h>
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#include <linux/netfilter.h>
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#include <linux/netfilter/x_tables.h>
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#include <linux/netfilter/xt_TEE.h>
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enum {
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O_GATEWAY = 0,
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O_OIF,
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};
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#define s struct xt_tee_tginfo
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static const struct xt_option_entry tee_tg_opts[] = {
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{.name = "gateway", .id = O_GATEWAY, .type = XTTYPE_HOST,
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.flags = XTOPT_MAND | XTOPT_PUT, XTOPT_POINTER(s, gw)},
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{.name = "oif", .id = O_OIF, .type = XTTYPE_STRING,
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.flags = XTOPT_PUT, XTOPT_POINTER(s, oif)},
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XTOPT_TABLEEND,
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};
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#undef s
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static void tee_tg_help(void)
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{
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printf(
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"TEE target options:\n"
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" --gateway IPADDR Route packet via the gateway given by address\n"
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" --oif NAME Include oif in route calculation\n"
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"\n");
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}
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static void tee_tg_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 xt_tee_tginfo *info = (const void *)target->data;
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if (numeric)
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printf(" TEE gw:%s", xtables_ipaddr_to_numeric(&info->gw.in));
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else
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printf(" TEE gw:%s", xtables_ipaddr_to_anyname(&info->gw.in));
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if (*info->oif != '\0')
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printf(" oif=%s", info->oif);
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}
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static void tee_tg6_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 xt_tee_tginfo *info = (const void *)target->data;
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if (numeric)
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printf(" TEE gw:%s", xtables_ip6addr_to_numeric(&info->gw.in6));
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else
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printf(" TEE gw:%s", xtables_ip6addr_to_anyname(&info->gw.in6));
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if (*info->oif != '\0')
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printf(" oif=%s", info->oif);
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}
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static void tee_tg_save(const void *ip, const struct xt_entry_target *target)
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{
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const struct xt_tee_tginfo *info = (const void *)target->data;
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printf(" --gateway %s", xtables_ipaddr_to_numeric(&info->gw.in));
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if (*info->oif != '\0')
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printf(" --oif %s", info->oif);
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}
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static void tee_tg6_save(const void *ip, const struct xt_entry_target *target)
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{
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const struct xt_tee_tginfo *info = (const void *)target->data;
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printf(" --gateway %s", xtables_ip6addr_to_numeric(&info->gw.in6));
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if (*info->oif != '\0')
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printf(" --oif %s", info->oif);
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}
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static int tee_tg_xlate(struct xt_xlate *xl,
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const struct xt_xlate_tg_params *params)
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{
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const struct xt_tee_tginfo *info = (const void *)params->target->data;
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if (params->numeric)
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xt_xlate_add(xl, "dup to %s",
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xtables_ipaddr_to_numeric(&info->gw.in));
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else
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xt_xlate_add(xl, "dup to %s",
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xtables_ipaddr_to_anyname(&info->gw.in));
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if (*info->oif != '\0')
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xt_xlate_add(xl, " device %s", info->oif);
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return 1;
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}
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static int tee_tg6_xlate(struct xt_xlate *xl,
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const struct xt_xlate_tg_params *params)
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{
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const struct xt_tee_tginfo *info = (const void *)params->target->data;
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if (params->numeric)
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xt_xlate_add(xl, "dup to %s",
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xtables_ip6addr_to_numeric(&info->gw.in6));
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else
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xt_xlate_add(xl, "dup to %s",
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xtables_ip6addr_to_anyname(&info->gw.in6));
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if (*info->oif != '\0')
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xt_xlate_add(xl, " device %s", info->oif);
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return 1;
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}
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static struct xtables_target tee_tg_reg[] = {
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{
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.name = "TEE",
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.version = XTABLES_VERSION,
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.revision = 1,
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.family = NFPROTO_IPV4,
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.size = XT_ALIGN(sizeof(struct xt_tee_tginfo)),
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.userspacesize = offsetof(struct xt_tee_tginfo, priv),
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.help = tee_tg_help,
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.print = tee_tg_print,
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.save = tee_tg_save,
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.x6_parse = xtables_option_parse,
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.x6_options = tee_tg_opts,
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.xlate = tee_tg_xlate,
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},
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{
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.name = "TEE",
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.version = XTABLES_VERSION,
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.revision = 1,
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.family = NFPROTO_IPV6,
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.size = XT_ALIGN(sizeof(struct xt_tee_tginfo)),
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.userspacesize = offsetof(struct xt_tee_tginfo, priv),
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.help = tee_tg_help,
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.print = tee_tg6_print,
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.save = tee_tg6_save,
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.x6_parse = xtables_option_parse,
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.x6_options = tee_tg_opts,
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.xlate = tee_tg6_xlate,
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},
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};
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void _init(void)
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{
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xtables_register_targets(tee_tg_reg, ARRAY_SIZE(tee_tg_reg));
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}
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