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