netdev - Re: [PATCHv3] extensions: libxt

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Date:	Thu, 15 Jul 2010 11:39:48 +0200
From:	Patrick McHardy <kaber@...sh.net>
To:	"Michael S. Tsirkin" <mst@...hat.com>
CC:	"David S. Miller" <davem@...emloft.net>,
	Jan Engelhardt <jengelh@...ozas.de>,
	Randy Dunlap <randy.dunlap@...cle.com>,
	netfilter-devel@...r.kernel.org, netfilter@...r.kernel.org,
	coreteam@...filter.org, linux-kernel@...r.kernel.org,
	netdev@...r.kernel.org, kvm@...r.kernel.org,
	herbert@...dor.hengli.com.au
Subject: Re: [PATCHv3] extensions: libxt_CHECKSUM extension

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@...monks.org>
> + * (C) 2010 by Red Hat, Inc
> + * Author: Michael S. Tsirkin <mst@...hat.com>
> + *
> + * 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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