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/* Shared library add-on to iptables to add MAC address support. */
#include <stdio.h>
#include <netdb.h>
#include <string.h>
#include <stdlib.h>
#include <getopt.h>
#if defined(__GLIBC__) && __GLIBC__ == 2
#include <net/ethernet.h>
#else
#include <linux/if_ether.h>
#endif
#include <xtables.h>
#include <linux/netfilter/xt_mac.h>
static void mac_help(void)
{
printf(
"mac match options:\n"
"[!] --mac-source XX:XX:XX:XX:XX:XX\n"
" Match source MAC address\n");
}
static const struct option mac_opts[] = {
{ "mac-source", 1, NULL, '1' },
{ .name = NULL }
};
static void
parse_mac(const char *mac, struct xt_mac_info *info)
{
unsigned int i = 0;
if (strlen(mac) != ETH_ALEN*3-1)
xtables_error(PARAMETER_PROBLEM, "Bad mac address \"%s\"", mac);
for (i = 0; i < ETH_ALEN; i++) {
long number;
char *end;
number = strtol(mac + i*3, &end, 16);
if (end == mac + i*3 + 2
&& number >= 0
&& number <= 255)
info->srcaddr[i] = number;
else
xtables_error(PARAMETER_PROBLEM,
"Bad mac address `%s'", mac);
}
}
static int
mac_parse(int c, char **argv, int invert, unsigned int *flags,
const void *entry, struct xt_entry_match **match)
{
struct xt_mac_info *macinfo = (struct xt_mac_info *)(*match)->data;
switch (c) {
case '1':
xtables_check_inverse(optarg, &invert, &optind, 0, argv);
parse_mac(optarg, macinfo);
if (invert)
macinfo->invert = 1;
*flags = 1;
break;
default:
return 0;
}
return 1;
}
static void print_mac(const unsigned char macaddress[ETH_ALEN])
{
unsigned int i;
printf("%02X", macaddress[0]);
for (i = 1; i < ETH_ALEN; i++)
printf(":%02X", macaddress[i]);
printf(" ");
}
static void mac_check(unsigned int flags)
{
if (!flags)
xtables_error(PARAMETER_PROBLEM,
"You must specify `--mac-source'");
}
static void
mac_print(const void *ip, const struct xt_entry_match *match, int numeric)
{
const struct xt_mac_info *info = (void *)match->data;
printf("MAC ");
if (info->invert)
printf("! ");
print_mac(info->srcaddr);
}
static void mac_save(const void *ip, const struct xt_entry_match *match)
{
const struct xt_mac_info *info = (void *)match->data;
if (info->invert)
printf("! ");
printf("--mac-source ");
print_mac(info->srcaddr);
}
static struct xtables_match mac_match = {
.family = NFPROTO_UNSPEC,
.name = "mac",
.version = XTABLES_VERSION,
.size = XT_ALIGN(sizeof(struct xt_mac_info)),
.userspacesize = XT_ALIGN(sizeof(struct xt_mac_info)),
.help = mac_help,
.parse = mac_parse,
.final_check = mac_check,
.print = mac_print,
.save = mac_save,
.extra_opts = mac_opts,
};
void _init(void)
{
xtables_register_match(&mac_match);
}
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