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/* Shared library add-on to iptables to add CONNMARK target support.
*
* (C) 2002,2004 MARA Systems AB <http://www.marasystems.com>
* by Henrik Nordstrom <hno@marasystems.com>
*
* Version 1.1
*
* 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., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
*/
#include <stdio.h>
#include <string.h>
#include <stdlib.h>
#include <getopt.h>
#include <xtables.h>
#include <linux/netfilter/x_tables.h>
#include <linux/netfilter/xt_CONNMARK.h>
#if 0
struct markinfo {
struct xt_entry_target t;
struct ipt_connmark_target_info mark;
};
#endif
/* Function which prints out usage message. */
static void
help(void)
{
printf(
"CONNMARK target v%s options:\n"
" --set-mark value[/mask] Set conntrack mark value\n"
" --save-mark [--mask mask] Save the packet nfmark in the connection\n"
" --restore-mark [--mask mask] Restore saved nfmark value\n"
"\n",
IPTABLES_VERSION);
}
static const struct option opts[] = {
{ "set-mark", 1, 0, '1' },
{ "save-mark", 0, 0, '2' },
{ "restore-mark", 0, 0, '3' },
{ "mask", 1, 0, '4' },
{ 0 }
};
/* Initialize the target. */
static void
init(struct xt_entry_target *t, unsigned int *nfcache)
{
}
/* Function which parses command options; returns true if it
ate an option */
static int
parse(int c, char **argv, int invert, unsigned int *flags,
const void *entry,
struct xt_entry_target **target)
{
struct xt_connmark_target_info *markinfo
= (struct xt_connmark_target_info *)(*target)->data;
markinfo->mask = 0xffffffffUL;
switch (c) {
char *end;
case '1':
markinfo->mode = XT_CONNMARK_SET;
markinfo->mark = strtoul(optarg, &end, 0);
if (*end == '/' && end[1] != '\0')
markinfo->mask = strtoul(end+1, &end, 0);
if (*end != '\0' || end == optarg)
exit_error(PARAMETER_PROBLEM, "Bad MARK value `%s'", optarg);
if (*flags)
exit_error(PARAMETER_PROBLEM,
"CONNMARK target: Can't specify --set-mark twice");
*flags = 1;
break;
case '2':
markinfo->mode = XT_CONNMARK_SAVE;
if (*flags)
exit_error(PARAMETER_PROBLEM,
"CONNMARK target: Can't specify --save-mark twice");
*flags = 1;
break;
case '3':
markinfo->mode = XT_CONNMARK_RESTORE;
if (*flags)
exit_error(PARAMETER_PROBLEM,
"CONNMARK target: Can't specify --restore-mark twice");
*flags = 1;
break;
case '4':
if (!*flags)
exit_error(PARAMETER_PROBLEM,
"CONNMARK target: Can't specify --mask without a operation");
markinfo->mask = strtoul(optarg, &end, 0);
if (*end != '\0' || end == optarg)
exit_error(PARAMETER_PROBLEM, "Bad MASK value `%s'", optarg);
break;
default:
return 0;
}
return 1;
}
static void
final_check(unsigned int flags)
{
if (!flags)
exit_error(PARAMETER_PROBLEM,
"CONNMARK target: No operation specified");
}
static void
print_mark(unsigned long mark)
{
printf("0x%lx", mark);
}
static void
print_mask(const char *text, unsigned long mask)
{
if (mask != 0xffffffffUL)
printf("%s0x%lx", text, mask);
}
/* Prints out the target info. */
static void
print(const void *ip,
const struct xt_entry_target *target,
int numeric)
{
const struct xt_connmark_target_info *markinfo =
(const struct xt_connmark_target_info *)target->data;
switch (markinfo->mode) {
case XT_CONNMARK_SET:
printf("CONNMARK set ");
print_mark(markinfo->mark);
print_mask("/", markinfo->mask);
printf(" ");
break;
case XT_CONNMARK_SAVE:
printf("CONNMARK save ");
print_mask("mask ", markinfo->mask);
printf(" ");
break;
case XT_CONNMARK_RESTORE:
printf("CONNMARK restore ");
print_mask("mask ", markinfo->mask);
break;
default:
printf("ERROR: UNKNOWN CONNMARK MODE ");
break;
}
}
/* Saves the target into in parsable form to stdout. */
static void
save(const void *ip, const struct xt_entry_target *target)
{
const struct xt_connmark_target_info *markinfo =
(const struct xt_connmark_target_info *)target->data;
switch (markinfo->mode) {
case XT_CONNMARK_SET:
printf("--set-mark ");
print_mark(markinfo->mark);
print_mask("/", markinfo->mask);
printf(" ");
break;
case XT_CONNMARK_SAVE:
printf("--save-mark ");
print_mask("--mask ", markinfo->mask);
break;
case XT_CONNMARK_RESTORE:
printf("--restore-mark ");
print_mask("--mask ", markinfo->mask);
break;
default:
printf("ERROR: UNKNOWN CONNMARK MODE ");
break;
}
}
static struct xtables_target connmark_target = {
.family = AF_INET,
.name = "CONNMARK",
.version = IPTABLES_VERSION,
.size = XT_ALIGN(sizeof(struct xt_connmark_target_info)),
.userspacesize = XT_ALIGN(sizeof(struct xt_connmark_target_info)),
.help = &help,
.init = &init,
.parse = &parse,
.final_check = &final_check,
.print = &print,
.save = &save,
.extra_opts = opts,
};
static struct xtables_target connmark_target6 = {
.family = AF_INET6,
.name = "CONNMARK",
.version = IPTABLES_VERSION,
.size = XT_ALIGN(sizeof(struct xt_connmark_target_info)),
.userspacesize = XT_ALIGN(sizeof(struct xt_connmark_target_info)),
.help = &help,
.init = &init,
.parse = &parse,
.final_check = &final_check,
.print = &print,
.save = &save,
.extra_opts = opts,
};
void _init(void)
{
xtables_register_target(&connmark_target);
xtables_register_target(&connmark_target6);
}
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