Am 11.07.2010 17:14, schrieb Michael S. Tsirkin:
> diff --git a/extensions/libxt_CHECKSUM.c b/extensions/libxt_CHECKSUM.c
> new file mode 100644
> index 0000000..00fbd8f
> --- /dev/null
> +++ b/extensions/libxt_CHECKSUM.c
> @@ -0,0 +1,99 @@
> +/* Shared library add-on to xtables for CHECKSUM
> + *
> + * (C) 2002 by Harald Welte <laforge@xxxxxxxxxxxx>
> + * (C) 2010 by Red Hat, Inc
> + * Author: Michael S. Tsirkin <mst@xxxxxxxxxx>
> + *
> + * This program is distributed under the terms of GNU GPL v2, 1991
> + *
> + * libxt_CHECKSUM.c borrowed some bits from libipt_ECN.c
> + *
> + * $Id$
Please no CVS IDs.
> + */
> +#include <stdio.h>
> +#include <string.h>
> +#include <stdlib.h>
> +#include <getopt.h>
> +
> +#include <xtables.h>
> +#include <linux/netfilter/xt_CHECKSUM.h>
> +
> +static void CHECKSUM_help(void)
> +{
> + printf(
> +"CHECKSUM target options\n"
> +" --checksum-fill Fill in packet checksum.\n");
> +}
> +
> +static const struct option CHECKSUM_opts[] = {
> + { "checksum-fill", 0, NULL, 'F' },
> + { .name = NULL }
> +};
> +
> +static int CHECKSUM_parse(int c, char **argv, int invert, unsigned int *flags,
> + const void *entry, struct xt_entry_target **target)
> +{
> + struct xt_CHECKSUM_info *einfo
> + = (struct xt_CHECKSUM_info *)(*target)->data;
> +
> + switch (c) {
> + case 'F':
> + if (*flags)
> + xtables_error(PARAMETER_PROBLEM,
> + "CHECKSUM target: Only use --checksum-fill ONCE!");
There is a helper function called xtables_param_act for checking double
arguments and printing a standarized error message.
> + einfo->operation = XT_CHECKSUM_OP_FILL;
> + *flags |= XT_CHECKSUM_OP_FILL;
> + break;
> + default:
> + return 0;
> + }
> +
> + return 1;
> +}
> +
--
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