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/* Shared library add-on to iptables to add NFMARK matching support. */
#include <stdio.h>
#include <netdb.h>
#include <string.h>
#include <stdlib.h>
#include <getopt.h>
#include <iptables.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 match v%s options:\n"
"[!] --mark value[/mask] Match nfmark value with optional mask\n"
"\n",
IPTABLES_VERSION);
}
static struct option opts[] = {
{ "mark", 1, 0, '1' },
{0}
};
/* 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,
unsigned int *nfcache,
struct xt_entry_match **match)
{
struct ipt_mark_info *markinfo = (struct ipt_mark_info *)(*match)->data;
switch (c) {
char *end;
case '1':
check_inverse(optarg, &invert, &optind, 0);
markinfo->mark = strtoul(optarg, &end, 0);
if (*end == '/') {
markinfo->mask = strtoul(end+1, &end, 0);
} else
markinfo->mask = 0xffffffff;
if (*end != '\0' || end == optarg)
exit_error(PARAMETER_PROBLEM, "Bad MARK value `%s'", optarg);
if (invert)
markinfo->invert = 1;
*flags = 1;
break;
default:
return 0;
}
return 1;
}
static void
print_mark(unsigned long mark, unsigned long mask, int numeric)
{
if(mask != 0xffffffff)
printf("0x%lx/0x%lx ", mark, mask);
else
printf("0x%lx ", mark);
}
/* Final check; must have specified --mark. */
static void
final_check(unsigned int flags)
{
if (!flags)
exit_error(PARAMETER_PROBLEM,
"MARK match: You must specify `--mark'");
}
/* Prints out the matchinfo. */
static void
print(const void *ip,
const struct xt_entry_match *match,
int numeric)
{
struct ipt_mark_info *info = (struct ipt_mark_info *)match->data;
printf("MARK match ");
if (info->invert)
printf("!");
print_mark(info->mark, info->mask, numeric);
}
/* Saves the union ipt_matchinfo in parsable form to stdout. */
static void
save(const void *ip, const struct xt_entry_match *match)
{
struct ipt_mark_info *info = (struct ipt_mark_info *)match->data;
if (info->invert)
printf("! ");
printf("--mark ");
print_mark(info->mark, info->mask, 0);
}
static struct iptables_match mark = {
.next = NULL,
.name = "mark",
.version = IPTABLES_VERSION,
.size = IPT_ALIGN(sizeof(struct ipt_mark_info)),
.userspacesize = IPT_ALIGN(sizeof(struct ipt_mark_info)),
.help = &help,
.parse = &parse,
.final_check = &final_check,
.print = &print,
.save = &save,
.extra_opts = opts
};
void _init(void)
{
register_match(&mark);
}
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