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/*
* (C) 2014 by Gao Feng <gaofeng@cn.fujitsu.com>
*
* arpt_MARK.c -- arptables extension to set mark for arp packet
*
* This program is free software; you can redistribute it and/or modify
* it under the terms of the GNU General Public License as published by
* the Free Software Foundation; either version 2 of the License, or
* (at your option) any later version.
*
* This program is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU General Public License for more details.
*
* You should have received a copy of the GNU General Public License
* along with this program; if not, write to the Free Software
* Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
*/
#include <stdio.h>
#include <getopt.h>
#include <arptables.h>
#include <linux/netfilter/xt_mark.h>
#include <linux/netfilter/xt_MARK.h>
#include <linux/netfilter/x_tables.h>
static void help(void)
{
printf(
"MARK target v%s options:\n"
"--set-mark mark : set the mark value\n"
"--and-mark value : binary AND the mark with value\n"
"--or-mark value : binary OR the mark with value\n",
ARPTABLES_VERSION);
}
#define MARK_OPT 1
#define AND_MARK_OPT 2
#define OR_MARK_OPT 3
static struct option opts[] = {
{ .name = "set-mark", .has_arg = required_argument, .flag = 0, .val = MARK_OPT },
{ .name = "and-mark", .has_arg = required_argument, .flag = 0, .val = AND_MARK_OPT },
{ .name = "or-mark", .has_arg = required_argument, .flag = 0, .val = OR_MARK_OPT },
{ .name = NULL}
};
static void init(struct arpt_entry_target *t)
{
struct xt_mark_tginfo2 *info = (struct xt_mark_tginfo2 *) t->data;
info->mark = 0;
}
static int parse(int c, char **argv, int invert, unsigned int *flags,
const struct arpt_entry *e, struct arpt_entry_target **t)
{
struct xt_mark_tginfo2 *info = (struct xt_mark_tginfo2 *)(*t)->data;
int i;
switch (c) {
case MARK_OPT:
if (sscanf(argv[optind-1], "%x", &i) != 1) {
exit_error(PARAMETER_PROBLEM,
"Bad mark value `%s'", optarg);
return 0;
}
info->mark = i;
if (*flags)
exit_error(PARAMETER_PROBLEM,
"MARK: Can't specify --set-mark twice");
*flags = 1;
break;
case AND_MARK_OPT:
if (sscanf(argv[optind-1], "%x", &i) != 1) {
exit_error(PARAMETER_PROBLEM,
"Bad mark value `%s'", optarg);
return 0;
}
info->mark = 0;
info->mask = ~i;
if (*flags)
exit_error(PARAMETER_PROBLEM,
"MARK: Can't specify --and-mark twice");
*flags = 1;
break;
case OR_MARK_OPT:
if (sscanf(argv[optind-1], "%x", &i) != 1) {
exit_error(PARAMETER_PROBLEM,
"Bad mark value `%s'", optarg);
return 0;
}
info->mark = info->mask = i;
if (*flags)
exit_error(PARAMETER_PROBLEM,
"MARK: Can't specify --or-mark twice");
*flags = 1;
break;
default:
return 0;
}
return 1;
}
static void final_check(unsigned int flags)
{
if (!flags)
exit_error(PARAMETER_PROBLEM, "MARK: Parameter --set-mark/--and-mark/--or-mark is required");
}
static void print(const struct arpt_arp *ip,
const struct arpt_entry_target *target, int numeric)
{
struct xt_mark_tginfo2 *info = (struct xt_mark_tginfo2 *)(target->data);
if (info->mark == 0)
printf("--and-mark %x", (unsigned int)(uint32_t)~info->mask);
else if (info->mark == info->mask)
printf("--or-mark %x", info->mark);
else
printf("--set-mark %x", info->mark);
}
static void save(const struct arpt_arp *ip,
const struct arpt_entry_target *target)
{
}
static struct arptables_target mark = {
.next = NULL,
.name = "MARK",
.version = ARPTABLES_VERSION,
.size = ARPT_ALIGN(sizeof(struct xt_mark_tginfo2)),
.userspacesize = ARPT_ALIGN(sizeof(struct xt_mark_tginfo2)),
.revision = 2,
.help = help,
.init = init,
.parse = parse,
.final_check = final_check,
.print = print,
.save = save,
.extra_opts = opts
};
static void _init(void) __attribute__ ((constructor));
static void _init(void)
{
register_target(&mark);
}
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