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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 <xtables.h>
#include <linux/netfilter/xt_physdev.h>
#if defined(__GLIBC__) && __GLIBC__ == 2
#include <net/ethernet.h>
#else
#include <linux/if_ether.h>
#endif
static void physdev_help(void)
{
printf(
"physdev match options:\n"
" [!] --physdev-in inputname[+] bridge port name ([+] for wildcard)\n"
" [!] --physdev-out outputname[+] 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");
}
static const struct option physdev_opts[] = {
{ "physdev-in", 1, NULL, '1' },
{ "physdev-out", 1, NULL, '2' },
{ "physdev-is-in", 0, NULL, '3' },
{ "physdev-is-out", 0, NULL, '4' },
{ "physdev-is-bridged", 0, NULL, '5' },
{ .name = NULL }
};
static int
physdev_parse(int c, char **argv, int invert, unsigned int *flags,
const void *entry, struct xt_entry_match **match)
{
struct xt_physdev_info *info =
(struct xt_physdev_info*)(*match)->data;
switch (c) {
case '1':
if (*flags & XT_PHYSDEV_OP_IN)
goto multiple_use;
xtables_check_inverse(optarg, &invert, &optind, 0, argv);
xtables_parse_interface(optarg, info->physindev,
(unsigned char *)info->in_mask);
if (invert)
info->invert |= XT_PHYSDEV_OP_IN;
info->bitmask |= XT_PHYSDEV_OP_IN;
*flags |= XT_PHYSDEV_OP_IN;
break;
case '2':
if (*flags & XT_PHYSDEV_OP_OUT)
goto multiple_use;
xtables_check_inverse(optarg, &invert, &optind, 0, argv);
xtables_parse_interface(optarg, info->physoutdev,
(unsigned char *)info->out_mask);
if (invert)
info->invert |= XT_PHYSDEV_OP_OUT;
info->bitmask |= XT_PHYSDEV_OP_OUT;
*flags |= XT_PHYSDEV_OP_OUT;
break;
case '3':
if (*flags & XT_PHYSDEV_OP_ISIN)
goto multiple_use;
xtables_check_inverse(optarg, &invert, &optind, 0, argv);
info->bitmask |= XT_PHYSDEV_OP_ISIN;
if (invert)
info->invert |= XT_PHYSDEV_OP_ISIN;
*flags |= XT_PHYSDEV_OP_ISIN;
break;
case '4':
if (*flags & XT_PHYSDEV_OP_ISOUT)
goto multiple_use;
xtables_check_inverse(optarg, &invert, &optind, 0, argv);
info->bitmask |= XT_PHYSDEV_OP_ISOUT;
if (invert)
info->invert |= XT_PHYSDEV_OP_ISOUT;
*flags |= XT_PHYSDEV_OP_ISOUT;
break;
case '5':
if (*flags & XT_PHYSDEV_OP_BRIDGED)
goto multiple_use;
xtables_check_inverse(optarg, &invert, &optind, 0, argv);
if (invert)
info->invert |= XT_PHYSDEV_OP_BRIDGED;
*flags |= XT_PHYSDEV_OP_BRIDGED;
info->bitmask |= XT_PHYSDEV_OP_BRIDGED;
break;
default:
return 0;
}
return 1;
multiple_use:
xtables_error(PARAMETER_PROBLEM,
"multiple use of the same physdev option is not allowed");
}
static void physdev_check(unsigned int flags)
{
if (flags == 0)
xtables_error(PARAMETER_PROBLEM, "PHYSDEV: no physdev option specified");
}
static void
physdev_print(const void *ip, const struct xt_entry_match *match, int numeric)
{
const struct xt_physdev_info *info = (const void *)match->data;
printf("PHYSDEV match");
if (info->bitmask & XT_PHYSDEV_OP_ISIN)
printf("%s --physdev-is-in",
info->invert & XT_PHYSDEV_OP_ISIN ? " !":"");
if (info->bitmask & XT_PHYSDEV_OP_IN)
printf("%s --physdev-in %s",
(info->invert & XT_PHYSDEV_OP_IN) ? " !":"", info->physindev);
if (info->bitmask & XT_PHYSDEV_OP_ISOUT)
printf("%s --physdev-is-out",
info->invert & XT_PHYSDEV_OP_ISOUT ? " !":"");
if (info->bitmask & XT_PHYSDEV_OP_OUT)
printf("%s --physdev-out %s",
(info->invert & XT_PHYSDEV_OP_OUT) ? " !":"", info->physoutdev);
if (info->bitmask & XT_PHYSDEV_OP_BRIDGED)
printf("%s --physdev-is-bridged",
info->invert & XT_PHYSDEV_OP_BRIDGED ? " !":"");
printf(" ");
}
static void physdev_save(const void *ip, const struct xt_entry_match *match)
{
const struct xt_physdev_info *info = (const void *)match->data;
if (info->bitmask & XT_PHYSDEV_OP_ISIN)
printf("%s--physdev-is-in ",
(info->invert & XT_PHYSDEV_OP_ISIN) ? "! " : "");
if (info->bitmask & XT_PHYSDEV_OP_IN)
printf("%s--physdev-in %s ",
(info->invert & XT_PHYSDEV_OP_IN) ? "! " : "",
info->physindev);
if (info->bitmask & XT_PHYSDEV_OP_ISOUT)
printf("%s--physdev-is-out ",
(info->invert & XT_PHYSDEV_OP_ISOUT) ? "! " : "");
if (info->bitmask & XT_PHYSDEV_OP_OUT)
printf("%s--physdev-out %s ",
(info->invert & XT_PHYSDEV_OP_OUT) ? "! " : "",
info->physoutdev);
if (info->bitmask & XT_PHYSDEV_OP_BRIDGED)
printf("%s--physdev-is-bridged ",
(info->invert & XT_PHYSDEV_OP_BRIDGED) ? "! " : "");
}
static struct xtables_match physdev_match = {
.family = NFPROTO_UNSPEC,
.name = "physdev",
.version = XTABLES_VERSION,
.size = XT_ALIGN(sizeof(struct xt_physdev_info)),
.userspacesize = XT_ALIGN(sizeof(struct xt_physdev_info)),
.help = physdev_help,
.parse = physdev_parse,
.final_check = physdev_check,
.print = physdev_print,
.save = physdev_save,
.extra_opts = physdev_opts,
};
void _init(void)
{
xtables_register_match(&physdev_match);
}
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