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/* Shared library add-on to iptables to add bridge port matching support. */
#include <stdio.h>
#include <string.h>
#include <stdlib.h>
#include <getopt.h>
#include <ctype.h>
#include <iptables.h>
#include <linux/netfilter_ipv4/ipt_physdev.h>
#if defined(__GLIBC__) && __GLIBC__ == 2
#include <net/ethernet.h>
#else
#include <linux/if_ether.h>
#endif
static void
help(void)
{
printf(
"physdev v%s options:\n"
" --physdev-in [!] input name[+] bridge port name ([+] for wildcard)\n"
" --physdev-out [!] output name[+] bridge port name ([+] for wildcard)\n"
" [!] --physdev-is-in arrived on a bridge device\n"
" [!] --physdev-is-out will leave on a bridge device\n"
" [!] --physdev-is-bridged it's a bridged packet\n"
"\n", IPTABLES_VERSION);
}
static struct option opts[] = {
{ "physdev-in", 1, 0, '1' },
{ "physdev-out", 1, 0, '2' },
{ "physdev-is-in", 0, 0, '3' },
{ "physdev-is-out", 0, 0, '4' },
{ "physdev-is-bridged", 0, 0, '5' },
{0}
};
/* copied from iptables.c */
static void
parse_interface(const char *arg, char *vianame, unsigned char *mask)
{
int vialen = strlen(arg);
unsigned int i;
memset(mask, 0, IFNAMSIZ);
memset(vianame, 0, IFNAMSIZ);
if (vialen + 1 > IFNAMSIZ)
exit_error(PARAMETER_PROBLEM,
"interface name `%s' must be shorter than IFNAMSIZ"
" (%i)", arg, IFNAMSIZ-1);
strcpy(vianame, arg);
if (vialen == 0)
memset(mask, 0, IFNAMSIZ);
else if (vianame[vialen - 1] == '+') {
memset(mask, 0xFF, vialen - 1);
memset(mask + vialen - 1, 0, IFNAMSIZ - vialen + 1);
/* Don't remove `+' here! -HW */
} else {
/* Include nul-terminator in match */
memset(mask, 0xFF, vialen + 1);
memset(mask + vialen + 1, 0, IFNAMSIZ - vialen - 1);
for (i = 0; vianame[i]; i++) {
if (!isalnum(vianame[i])
&& vianame[i] != '_'
&& vianame[i] != '.') {
printf("Warning: wierd character in interface"
" `%s' (No aliases, :, ! or *).\n",
vianame);
break;
}
}
}
}
static void
init(struct ipt_entry_match *m, unsigned int *nfcache)
{
}
static int
parse(int c, char **argv, int invert, unsigned int *flags,
const struct ipt_entry *entry,
unsigned int *nfcache,
struct ipt_entry_match **match)
{
struct ipt_physdev_info *info =
(struct ipt_physdev_info*)(*match)->data;
switch (c) {
case '1':
if (*flags & IPT_PHYSDEV_OP_IN)
goto multiple_use;
check_inverse(optarg, &invert, &optind, 0);
parse_interface(argv[optind-1], info->physindev, info->in_mask);
if (invert)
info->invert |= IPT_PHYSDEV_OP_IN;
info->bitmask |= IPT_PHYSDEV_OP_IN;
*flags |= IPT_PHYSDEV_OP_IN;
break;
case '2':
if (*flags & IPT_PHYSDEV_OP_OUT)
goto multiple_use;
check_inverse(optarg, &invert, &optind, 0);
parse_interface(argv[optind-1], info->physoutdev,
info->out_mask);
if (invert)
info->invert |= IPT_PHYSDEV_OP_OUT;
info->bitmask |= IPT_PHYSDEV_OP_OUT;
*flags |= IPT_PHYSDEV_OP_OUT;
break;
case '3':
if (*flags & IPT_PHYSDEV_OP_ISIN)
goto multiple_use;
check_inverse(optarg, &invert, &optind, 0);
info->bitmask |= IPT_PHYSDEV_OP_ISIN;
if (invert)
info->invert |= IPT_PHYSDEV_OP_ISIN;
*flags |= IPT_PHYSDEV_OP_ISIN;
break;
case '4':
if (*flags & IPT_PHYSDEV_OP_ISOUT)
goto multiple_use;
check_inverse(optarg, &invert, &optind, 0);
info->bitmask |= IPT_PHYSDEV_OP_ISOUT;
if (invert)
info->invert |= IPT_PHYSDEV_OP_ISOUT;
*flags |= IPT_PHYSDEV_OP_ISOUT;
break;
case '5':
if (*flags & IPT_PHYSDEV_OP_BRIDGED)
goto multiple_use;
check_inverse(optarg, &invert, &optind, 0);
if (invert)
info->invert |= IPT_PHYSDEV_OP_BRIDGED;
*flags |= IPT_PHYSDEV_OP_BRIDGED;
info->bitmask |= IPT_PHYSDEV_OP_BRIDGED;
break;
default:
return 0;
}
return 1;
multiple_use:
exit_error(PARAMETER_PROBLEM,
"multiple use of the same physdev option is not allowed");
}
static void final_check(unsigned int flags)
{
if (flags == 0)
exit_error(PARAMETER_PROBLEM, "PHYSDEV: no physdev option specified");
}
static void
print(const struct ipt_ip *ip,
const struct ipt_entry_match *match,
int numeric)
{
struct ipt_physdev_info *info =
(struct ipt_physdev_info*)match->data;
printf("PHYSDEV match");
if (info->bitmask & IPT_PHYSDEV_OP_ISIN)
printf("%s --physdev-is-in",
info->invert & IPT_PHYSDEV_OP_ISIN ? " !":"");
if (info->bitmask & IPT_PHYSDEV_OP_IN)
printf("%s --physdev-in %s",
(info->invert & IPT_PHYSDEV_OP_IN) ? " !":"", info->physindev);
if (info->bitmask & IPT_PHYSDEV_OP_ISOUT)
printf("%s --physdev-is-out",
info->invert & IPT_PHYSDEV_OP_ISOUT ? " !":"");
if (info->bitmask & IPT_PHYSDEV_OP_OUT)
printf("%s --physdev-out %s",
(info->invert & IPT_PHYSDEV_OP_OUT) ? " !":"", info->physoutdev);
if (info->bitmask & IPT_PHYSDEV_OP_BRIDGED)
printf("%s --physdev-is-bridged",
info->invert & IPT_PHYSDEV_OP_BRIDGED ? " !":"");
printf(" ");
}
static void save(const struct ipt_ip *ip, const struct ipt_entry_match *match)
{
struct ipt_physdev_info *info =
(struct ipt_physdev_info*)match->data;
if (info->bitmask & IPT_PHYSDEV_OP_ISIN)
printf("%s --physdev-is-in",
info->invert & IPT_PHYSDEV_OP_ISIN ? " !":"");
if (info->bitmask & IPT_PHYSDEV_OP_IN)
printf("%s --physdev-in %s",
(info->invert & IPT_PHYSDEV_OP_IN) ? " !":"", info->physindev);
if (info->bitmask & IPT_PHYSDEV_OP_ISOUT)
printf("%s --physdev-is-out",
info->invert & IPT_PHYSDEV_OP_ISOUT ? " !":"");
if (info->bitmask & IPT_PHYSDEV_OP_OUT)
printf("%s --physdev-out %s",
(info->invert & IPT_PHYSDEV_OP_OUT) ? " !":"", info->physoutdev);
if (info->bitmask & IPT_PHYSDEV_OP_BRIDGED)
printf("%s --physdev-is-bridged",
info->invert & IPT_PHYSDEV_OP_BRIDGED ? " !":"");
printf(" ");
}
static
struct iptables_match physdev
= { NULL,
"physdev",
IPTABLES_VERSION,
IPT_ALIGN(sizeof(struct ipt_physdev_info)),
IPT_ALIGN(sizeof(struct ipt_physdev_info)),
&help,
&init,
&parse,
&final_check,
&print,
&save,
opts
};
void _init(void)
{
register_match(&physdev);
}
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