mirror of
git://git.code.sf.net/p/xtables-addons/xtables-addons
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94 lines
2.3 KiB
C
94 lines
2.3 KiB
C
/*
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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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#include <stdio.h>
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#include <string.h>
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#include <stdlib.h>
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#include <getopt.h>
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#include <xtables.h>
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#include "xt_CHECKSUM.h"
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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 option CHECKSUM_opts[] = {
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{ "checksum-fill", 0, NULL, 'F' },
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{ .name = NULL }
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};
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static int CHECKSUM_parse(int c, char **argv, int invert, unsigned int *flags,
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const void *entry, struct xt_entry_target **target)
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{
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struct xt_CHECKSUM_info *einfo
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= (struct xt_CHECKSUM_info *)(*target)->data;
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switch (c) {
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case 'F':
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xtables_param_act(XTF_ONLY_ONCE, "CHECKSUM", "--checksum-fill",
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*flags & XT_CHECKSUM_OP_FILL);
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einfo->operation = XT_CHECKSUM_OP_FILL;
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*flags |= XT_CHECKSUM_OP_FILL;
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break;
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default:
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return 0;
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}
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return 1;
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}
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static void CHECKSUM_check(unsigned int flags)
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{
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if (!flags)
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xtables_error(PARAMETER_PROBLEM,
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"CHECKSUM target: Parameter --checksum-fill is required");
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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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.parse = CHECKSUM_parse,
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.final_check = CHECKSUM_check,
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.print = CHECKSUM_print,
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.save = CHECKSUM_save,
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.extra_opts = CHECKSUM_opts,
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};
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static __attribute__((constructor)) 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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