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/* Shared library add-on to iptables to add MARK target support. */
#include <stdio.h>
#include <string.h>
#include <stdlib.h>
#include <getopt.h>
#include <iptables.h>
#include <linux/netfilter_ipv4/ip_tables.h>
/* For 64bit kernel / 32bit userspace */
#include "../include/linux/netfilter_ipv4/ipt_MARK.h"
/* Function which prints out usage message. */
static void
help(void)
{
printf(
"MARK target v%s options:\n"
" --set-mark value Set nfmark value\n"
" --and-mark value Binary AND the nfmark with value\n"
" --or-mark value Binary OR the nfmark with value\n"
"\n",
IPTABLES_VERSION);
}
static struct option opts[] = {
{ "set-mark", 1, 0, '1' },
{ "and-mark", 1, 0, '2' },
{ "or-mark", 1, 0, '3' },
{ 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_v0(int c, char **argv, int invert, unsigned int *flags,
const void *entry,
struct xt_entry_target **target)
{
struct ipt_mark_target_info *markinfo
= (struct ipt_mark_target_info *)(*target)->data;
switch (c) {
case '1':
if (string_to_number_l(optarg, 0, 0,
&markinfo->mark))
exit_error(PARAMETER_PROBLEM, "Bad MARK value `%s'", optarg);
if (*flags)
exit_error(PARAMETER_PROBLEM,
"MARK target: Can't specify --set-mark twice");
*flags = 1;
break;
case '2':
exit_error(PARAMETER_PROBLEM,
"MARK target: kernel too old for --and-mark");
case '3':
exit_error(PARAMETER_PROBLEM,
"MARK target: kernel too old for --or-mark");
default:
return 0;
}
return 1;
}
static void
final_check(unsigned int flags)
{
if (!flags)
exit_error(PARAMETER_PROBLEM,
"MARK target: Parameter --set/and/or-mark"
" is required");
}
/* Function which parses command options; returns true if it
ate an option */
static int
parse_v1(int c, char **argv, int invert, unsigned int *flags,
const void *entry,
struct xt_entry_target **target)
{
struct ipt_mark_target_info_v1 *markinfo
= (struct ipt_mark_target_info_v1 *)(*target)->data;
switch (c) {
case '1':
markinfo->mode = IPT_MARK_SET;
break;
case '2':
markinfo->mode = IPT_MARK_AND;
break;
case '3':
markinfo->mode = IPT_MARK_OR;
break;
default:
return 0;
}
if (string_to_number_l(optarg, 0, 0, &markinfo->mark))
exit_error(PARAMETER_PROBLEM, "Bad MARK value `%s'", optarg);
if (*flags)
exit_error(PARAMETER_PROBLEM,
"MARK target: Can't specify --set-mark twice");
*flags = 1;
return 1;
}
static void
print_mark(unsigned long mark)
{
printf("0x%lx ", mark);
}
/* Prints out the targinfo. */
static void
print_v0(const void *ip,
const struct xt_entry_target *target,
int numeric)
{
const struct ipt_mark_target_info *markinfo =
(const struct ipt_mark_target_info *)target->data;
printf("MARK set ");
print_mark(markinfo->mark);
}
/* Saves the union ipt_targinfo in parsable form to stdout. */
static void
save_v0(const void *ip, const struct xt_entry_target *target)
{
const struct ipt_mark_target_info *markinfo =
(const struct ipt_mark_target_info *)target->data;
printf("--set-mark ");
print_mark(markinfo->mark);
}
/* Prints out the targinfo. */
static void
print_v1(const void *ip,
const struct xt_entry_target *target,
int numeric)
{
const struct ipt_mark_target_info_v1 *markinfo =
(const struct ipt_mark_target_info_v1 *)target->data;
switch (markinfo->mode) {
case IPT_MARK_SET:
printf("MARK set ");
break;
case IPT_MARK_AND:
printf("MARK and ");
break;
case IPT_MARK_OR:
printf("MARK or ");
break;
}
print_mark(markinfo->mark);
}
/* Saves the union ipt_targinfo in parsable form to stdout. */
static void
save_v1(const void *ip, const struct xt_entry_target *target)
{
const struct ipt_mark_target_info_v1 *markinfo =
(const struct ipt_mark_target_info_v1 *)target->data;
switch (markinfo->mode) {
case IPT_MARK_SET:
printf("--set-mark ");
break;
case IPT_MARK_AND:
printf("--and-mark ");
break;
case IPT_MARK_OR:
printf("--or-mark ");
break;
}
print_mark(markinfo->mark);
}
static
struct iptables_target mark_v0 = {
.next = NULL,
.name = "MARK",
.version = IPTABLES_VERSION,
.revision = 0,
.size = IPT_ALIGN(sizeof(struct ipt_mark_target_info)),
.userspacesize = IPT_ALIGN(sizeof(struct ipt_mark_target_info)),
.help = &help,
.init = &init,
.parse = &parse_v0,
.final_check = &final_check,
.print = &print_v0,
.save = &save_v0,
.extra_opts = opts
};
static
struct iptables_target mark_v1 = {
.next = NULL,
.name = "MARK",
.version = IPTABLES_VERSION,
.revision = 1,
.size = IPT_ALIGN(sizeof(struct ipt_mark_target_info_v1)),
.userspacesize = IPT_ALIGN(sizeof(struct ipt_mark_target_info_v1)),
.help = &help,
.init = &init,
.parse = &parse_v1,
.final_check = &final_check,
.print = &print_v1,
.save = &save_v1,
.extra_opts = opts
};
void _init(void)
{
register_target(&mark_v0);
register_target(&mark_v1);
}
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