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/*
* Copyright (c) 2013 Patrick McHardy <kaber@trash.net>
*
* This program is free software; you can redistribute it and/or modify
* it under the terms of the GNU General Public License version 2 as
* published by the Free Software Foundation.
*/
#include <stdbool.h>
#include <stdio.h>
#include <xtables.h>
#include <linux/netfilter/xt_SYNPROXY.h>
enum {
O_SACK_PERM = 0,
O_TIMESTAMP,
O_WSCALE,
O_MSS,
O_ECN,
};
static void SYNPROXY_help(void)
{
printf(
"SYNPROXY target options:\n"
" --sack-perm Set SACK_PERM\n"
" --timestamp Set TIMESTAMP\n"
" --wscale value Set window scaling factor\n"
" --mss value Set MSS value\n"
" --ecn Set ECN\n");
}
static const struct xt_option_entry SYNPROXY_opts[] = {
{.name = "sack-perm", .id = O_SACK_PERM, .type = XTTYPE_NONE, },
{.name = "timestamp", .id = O_TIMESTAMP, .type = XTTYPE_NONE, },
{.name = "wscale", .id = O_WSCALE, .type = XTTYPE_UINT32, },
{.name = "mss", .id = O_MSS, .type = XTTYPE_UINT32, },
{.name = "ecn", .id = O_ECN, .type = XTTYPE_NONE, },
XTOPT_TABLEEND,
};
static void SYNPROXY_parse(struct xt_option_call *cb)
{
struct xt_synproxy_info *info = cb->data;
xtables_option_parse(cb);
switch (cb->entry->id) {
case O_SACK_PERM:
info->options |= XT_SYNPROXY_OPT_SACK_PERM;
break;
case O_TIMESTAMP:
info->options |= XT_SYNPROXY_OPT_TIMESTAMP;
break;
case O_WSCALE:
info->options |= XT_SYNPROXY_OPT_WSCALE;
info->wscale = cb->val.u32;
break;
case O_MSS:
info->options |= XT_SYNPROXY_OPT_MSS;
info->mss = cb->val.u32;
break;
case O_ECN:
info->options |= XT_SYNPROXY_OPT_ECN;
break;
}
}
static void SYNPROXY_check(struct xt_fcheck_call *cb)
{
}
static void SYNPROXY_print(const void *ip, const struct xt_entry_target *target,
int numeric)
{
const struct xt_synproxy_info *info =
(const struct xt_synproxy_info *)target->data;
printf(" SYNPROXY ");
if (info->options & XT_SYNPROXY_OPT_SACK_PERM)
printf("sack-perm ");
if (info->options & XT_SYNPROXY_OPT_TIMESTAMP)
printf("timestamp ");
if (info->options & XT_SYNPROXY_OPT_WSCALE)
printf("wscale %u ", info->wscale);
if (info->options & XT_SYNPROXY_OPT_MSS)
printf("mss %u ", info->mss);
if (info->options & XT_SYNPROXY_OPT_ECN)
printf("ecn ");
}
static void SYNPROXY_save(const void *ip, const struct xt_entry_target *target)
{
const struct xt_synproxy_info *info =
(const struct xt_synproxy_info *)target->data;
if (info->options & XT_SYNPROXY_OPT_SACK_PERM)
printf(" --sack-perm");
if (info->options & XT_SYNPROXY_OPT_TIMESTAMP)
printf(" --timestamp");
if (info->options & XT_SYNPROXY_OPT_WSCALE)
printf(" --wscale %u", info->wscale);
if (info->options & XT_SYNPROXY_OPT_MSS)
printf(" --mss %u", info->mss);
if (info->options & XT_SYNPROXY_OPT_ECN)
printf(" --ecn");
}
static int SYNPROXY_xlate(struct xt_xlate *xl,
const struct xt_xlate_tg_params *params)
{
const struct xt_synproxy_info *info =
(const struct xt_synproxy_info *)params->target->data;
xt_xlate_add(xl, "synproxy ");
if (info->options & XT_SYNPROXY_OPT_SACK_PERM)
xt_xlate_add(xl, "sack-perm ");
if (info->options & XT_SYNPROXY_OPT_TIMESTAMP)
xt_xlate_add(xl, "timestamp ");
if (info->options & XT_SYNPROXY_OPT_WSCALE)
xt_xlate_add(xl, "wscale %u ", info->wscale);
if (info->options & XT_SYNPROXY_OPT_MSS)
xt_xlate_add(xl, "mss %u ", info->mss);
if (info->options & XT_SYNPROXY_OPT_ECN)
xt_xlate_add(xl, "ecn ");
return 1;
}
static struct xtables_target synproxy_tg_reg = {
.family = NFPROTO_UNSPEC,
.name = "SYNPROXY",
.version = XTABLES_VERSION,
.revision = 0,
.size = XT_ALIGN(sizeof(struct xt_synproxy_info)),
.userspacesize = XT_ALIGN(sizeof(struct xt_synproxy_info)),
.help = SYNPROXY_help,
.print = SYNPROXY_print,
.save = SYNPROXY_save,
.x6_parse = SYNPROXY_parse,
.x6_fcheck = SYNPROXY_check,
.x6_options = SYNPROXY_opts,
.xlate = SYNPROXY_xlate,
};
void _init(void)
{
xtables_register_target(&synproxy_tg_reg);
}
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