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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>
/* Function which prints out usage message. */
static void
help(void)
{
printf(
"MAC v%s options:\n"
" --mac-source [!] XX:XX:XX:XX:XX:XX\n"
" Match source MAC address\n"
"\n", IPTABLES_VERSION);
}
static struct option opts[] = {
{ "mac-source", 1, 0, '1' },
{0}
};
static void
parse_mac(const char *mac, struct xt_mac_info *info)
{
unsigned int i = 0;
if (strlen(mac) != ETH_ALEN*3-1)
exit_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
exit_error(PARAMETER_PROBLEM,
"Bad mac address `%s'", mac);
}
}
/* 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 xt_mac_info *macinfo = (struct xt_mac_info *)(*match)->data;
switch (c) {
case '1':
check_inverse(optarg, &invert, &optind, 0);
parse_mac(argv[optind-1], macinfo);
if (invert)
macinfo->invert = 1;
*flags = 1;
break;
default:
return 0;
}
return 1;
}
static void print_mac(unsigned char macaddress[ETH_ALEN])
{
unsigned int i;
printf("%02X", macaddress[0]);
for (i = 1; i < ETH_ALEN; i++)
printf(":%02X", macaddress[i]);
printf(" ");
}
/* Final check; must have specified --mac. */
static void final_check(unsigned int flags)
{
if (!flags)
exit_error(PARAMETER_PROBLEM,
"You must specify `--mac-source'");
}
/* Prints out the matchinfo. */
static void
print(const void *ip,
const struct xt_entry_match *match,
int numeric)
{
printf("MAC ");
if (((struct xt_mac_info *)match->data)->invert)
printf("! ");
print_mac(((struct xt_mac_info *)match->data)->srcaddr);
}
/* Saves the union ipt_matchinfo in parsable form to stdout. */
static void save(const void *ip, const struct xt_entry_match *match)
{
if (((struct xt_mac_info *)match->data)->invert)
printf("! ");
printf("--mac-source ");
print_mac(((struct xt_mac_info *)match->data)->srcaddr);
}
static struct xtables_match mac = {
.next = NULL,
.family = AF_INET,
.name = "mac",
.version = IPTABLES_VERSION,
.size = XT_ALIGN(sizeof(struct xt_mac_info)),
.userspacesize = XT_ALIGN(sizeof(struct xt_mac_info)),
.help = &help,
.parse = &parse,
.final_check = &final_check,
.print = &print,
.save = &save,
.extra_opts = opts
};
static struct xtables_match mac6 = {
.next = NULL,
.family = AF_INET6,
.name = "mac",
.version = IPTABLES_VERSION,
.size = XT_ALIGN(sizeof(struct xt_mac_info)),
.userspacesize = XT_ALIGN(sizeof(struct xt_mac_info)),
.help = &help,
.parse = &parse,
.final_check = &final_check,
.print = &print,
.save = &save,
.extra_opts = opts
};
void _init(void)
{
xtables_register_match(&mac);
xtables_register_match(&mac6);
}
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