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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>
#include <linux/netfilter_ipv4/ipt_MARK.h>
struct markinfo {
struct ipt_entry_target t;
struct ipt_mark_target_info mark;
};
/* Function which prints out usage message. */
static void
help(void)
{
printf(
"MARK target v%s options:\n"
" --set-mark value Set nfmark value\n"
"\n",
NETFILTER_VERSION);
}
static struct option opts[] = {
{ "set-mark", 1, 0, '1' },
{ 0 }
};
/* Initialize the target. */
static void
init(struct ipt_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 struct ipt_entry *entry,
struct ipt_entry_target **target)
{
struct ipt_mark_target_info *markinfo
= (struct ipt_mark_target_info *)(*target)->data;
switch (c) {
char *end;
case '1':
markinfo->mark = strtoul(optarg, &end, 0);
if (*end != '\0' || end == optarg)
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;
default:
return 0;
}
return 1;
}
static void
final_check(unsigned int flags)
{
if (!flags)
exit_error(PARAMETER_PROBLEM,
"MARK target: Parameter --set-mark is required");
}
static void
print_mark(unsigned long mark, int numeric)
{
printf("0x%lx ", mark);
}
/* Prints out the targinfo. */
static void
print(const struct ipt_ip *ip,
const struct ipt_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, numeric);
}
/* Saves the union ipt_targinfo in parsable form to stdout. */
static void
save(const struct ipt_ip *ip, const struct ipt_entry_target *target)
{
const struct ipt_mark_target_info *markinfo =
(const struct ipt_mark_target_info *)target->data;
printf("--set-mark 0x%lx ", markinfo->mark);
}
static
struct iptables_target mark
= { NULL,
"MARK",
NETFILTER_VERSION,
IPT_ALIGN(sizeof(struct ipt_mark_target_info)),
IPT_ALIGN(sizeof(struct ipt_mark_target_info)),
&help,
&init,
&parse,
&final_check,
&print,
&save,
opts
};
void _init(void)
{
register_target(&mark);
}
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