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Date: Thu, 25 Oct 2007 17:25:50 +0200
From: Patrick McHardy <kaber@...sh.net>
To: Laszlo Attila Toth <panther@...abit.hu>
CC: David Miller <davem@...emloft.net>, netdev@...r.kernel.org
Subject: Re: [IFGROUPv4 iptables] Interface group match
Laszlo Attila Toth wrote:
> +++ extensions/libxt_ifgroup.c (revision 0)
> @@ -0,0 +1,196 @@
> +/*
> + * Shared library add-on to iptables to match
> + * packets by the incoming interface group.
> + *
> + * (c) 2006, 2007 Balazs Scheidler <bazsi@...abit.hu>,
> + * Laszlo Attila Toth <panther@...abit.hu>
> + */
> +#include <stdio.h>
> +#include <netdb.h>
> +#include <string.h>
> +#include <stdlib.h>
> +#include <getopt.h>
> +#include <xtables.h>
> +#include <linux/netfilter/xt_ifgroup.h>
> +
> +static void
> +ifgroup_help(void)
> +{
> + printf(
> +"ifgroup v%s options:\n"
> +" --ifgroup-in [!] group[/mask] incoming interface group and its mask\n"
> +" --ifgroup-out [!] group[/mask] outgoing interface group and its mask\n"
> +"\n", IPTABLES_VERSION);
> +}
> +
> +static struct option opts[] = {
> + {"ifgroup-in", 1, 0, '1'},
> + {"ifgroup-out", 1, 0, '2'},
The third member is a pointer, please use NULL.
> + { }
> +};
> +
> +#define PARAM_MATCH_IN 0x01
> +#define PARAM_MATCH_OUT 0x02
> +
> +static int
> +ifgroup_parse(int c, char **argv, int invert, unsigned int *flags,
> + const void *entry, struct xt_entry_match **match)
> +{
> + struct xt_ifgroup_info *info =
> + (struct xt_ifgroup_info *) (*match)->data;
> + char *end;
> +
> + switch (c)
> + {
This goes on the same line as the switch statement please.
> + case '1':
And please no extra indentation for the case labels.
> + if (*flags & PARAM_MATCH_IN)
> + exit_error(PARAMETER_PROBLEM,
> + "ifgroup match: Can't specify --ifgroup-in twice");
> +
> + check_inverse(optarg, &invert, &optind, 0);
> +
> + info->in_group = strtoul(optarg, &end, 0);
> + info->in_mask = 0xffffffffUL;
in_mask is not an unsigned long but an unsigned int.
> +
> + if (*end == '/')
> + info->in_mask = strtoul(end+1, &end, 0);
> +
> + if (*end != '\0' || end == optarg)
> + exit_error(PARAMETER_PROBLEM,
> + "ifgroup match: Bad ifgroup value `%s'",
> + optarg);
> +
> + if (invert)
> + info->flags |= XT_IFGROUP_INVERT_IN;
> +
> + *flags |= PARAM_MATCH_IN;
> + info->flags |= XT_IFGROUP_MATCH_IN;
> + break;
> + case '2':
> + if (*flags & PARAM_MATCH_OUT)
> + exit_error(PARAMETER_PROBLEM,
> + "ifgroup match: Can't specify "
> + "--ifgroup-out twice");
> +
> + check_inverse(optarg, &invert, &optind, 0);
> +
> + info->out_group = strtoul(optarg, &end, 0);
> + info->out_mask = 0xffffffffUL;
> +
> + if (*end == '/')
> + info->out_mask = strtoul(end+1, &end, 0);
> +
> + if (*end != '\0' || end == optarg)
> + exit_error(PARAMETER_PROBLEM,
> + "ifgroup match: Bad ifgroup "
> + "value `%s'",
> + optarg);
> +
> + if (invert)
> + info->flags |= XT_IFGROUP_INVERT_OUT;
> +
> + *flags |= PARAM_MATCH_OUT;
> + info->flags |= XT_IFGROUP_MATCH_OUT;
> + break;
> + default:
> + return 0;
> + }
> +
> + return 1;
> +}
> +
> +static void
> +ifgroup_final_check(unsigned int flags)
> +{
> + if (!flags)
> + exit_error(PARAMETER_PROBLEM,
> + "You must specify either "
> + "`--ifgroup-in' or `--ifgroup-out'");
> +}
> +
> +static void
> +ifgroup_print_value_in(struct xt_ifgroup_info *info)
> +{
> + printf("0x%x/0x%x ", info->in_group, info->in_mask);
> +}
> +
> +static void
> +ifgroup_print_value_out(struct xt_ifgroup_info *info)
> +{
> + printf("0x%x/0x%x ", info->out_group, info->out_mask);
> +}
Just a suggestion: not printing the mask when its ~0 would
improve readability.
> +
> +static void
> +ifgroup_print(const void *ip,
> + const struct xt_entry_match *match,
> + int numeric)
> +{
> + struct xt_ifgroup_info *info =
> + (struct xt_ifgroup_info *) match->data;
> +
> + printf("ifgroup ");
> +
> + if (info->flags & XT_IFGROUP_MATCH_IN) {
> + printf("in %s",
> + info->flags & XT_IFGROUP_INVERT_IN ? "! " : "");
> + ifgroup_print_value_in(info);
> + }
> + if (info->flags & XT_IFGROUP_MATCH_OUT) {
> + printf("out %s",
> + info->flags & XT_IFGROUP_INVERT_OUT ? "! " : "");
> + ifgroup_print_value_out(info);
> + }
> +}
> +
> +static void
> +ifgroup_save(const void *ip, const struct xt_entry_match *match)
> +{
> + struct xt_ifgroup_info *info =
> + (struct xt_ifgroup_info *) match->data;
> +
> + if (info->flags & XT_IFGROUP_MATCH_IN) {
> + printf("--ifgroup-in %s",
> + info->flags & XT_IFGROUP_INVERT_IN ? "! " : "");
> + ifgroup_print_value_in(info);
> + }
> + if (info->flags & XT_IFGROUP_MATCH_OUT) {
> + printf("--ifgroup-out %s",
> + info->flags & XT_IFGROUP_INVERT_OUT ? "! " : "");
> + ifgroup_print_value_out(info);
> + }
> +}
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