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/* Shared library add-on to xtables for CHECKSUM
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*
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* (C) 2002 by Harald Welte <laforge@gnumonks.org>
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* (C) 2010 by Red Hat, Inc
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* Author: Michael S. Tsirkin <mst@redhat.com>
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*
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* This program is distributed under the terms of GNU GPL v2, 1991
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*
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* libxt_CHECKSUM.c borrowed some bits from libipt_ECN.c
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*/
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#include <stdio.h>
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#include <xtables.h>
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#include <linux/netfilter/xt_CHECKSUM.h>
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enum {
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O_CHECKSUM_FILL = 0,
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};
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static void CHECKSUM_help(void)
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{
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printf(
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"CHECKSUM target options\n"
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" --checksum-fill Fill in packet checksum.\n");
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}
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static const struct xt_option_entry CHECKSUM_opts[] = {
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{.name = "checksum-fill", .id = O_CHECKSUM_FILL,
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.flags = XTOPT_MAND, .type = XTTYPE_NONE},
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XTOPT_TABLEEND,
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};
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static void CHECKSUM_parse(struct xt_option_call *cb)
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{
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struct xt_CHECKSUM_info *einfo = cb->data;
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xtables_option_parse(cb);
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einfo->operation = XT_CHECKSUM_OP_FILL;
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}
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static void CHECKSUM_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_CHECKSUM_info *einfo =
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(const struct xt_CHECKSUM_info *)target->data;
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printf(" CHECKSUM");
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if (einfo->operation & XT_CHECKSUM_OP_FILL)
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printf(" fill");
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}
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static void CHECKSUM_save(const void *ip, const struct xt_entry_target *target)
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{
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const struct xt_CHECKSUM_info *einfo =
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(const struct xt_CHECKSUM_info *)target->data;
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if (einfo->operation & XT_CHECKSUM_OP_FILL)
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printf(" --checksum-fill");
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}
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static struct xtables_target checksum_tg_reg = {
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.name = "CHECKSUM",
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.version = XTABLES_VERSION,
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.family = NFPROTO_UNSPEC,
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.size = XT_ALIGN(sizeof(struct xt_CHECKSUM_info)),
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.userspacesize = XT_ALIGN(sizeof(struct xt_CHECKSUM_info)),
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.help = CHECKSUM_help,
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.print = CHECKSUM_print,
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.save = CHECKSUM_save,
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.x6_parse = CHECKSUM_parse,
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.x6_options = CHECKSUM_opts,
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};
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void _init(void)
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{
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xtables_register_target(&checksum_tg_reg);
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}
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