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/* 802_3
*
* Author:
* Chris Vitale <csv@bluetail.com>
*
* May 2003
*
* Adapted by Arturo Borrero Gonzalez <arturo@debian.org>
* to use libxtables for ebtables-compat
*/
#include <stdbool.h>
#include <stdio.h>
#include <string.h>
#include <stdlib.h>
#include <getopt.h>
#include <xtables.h>
#include <linux/netfilter_bridge/ebt_802_3.h>
#define _802_3_SAP '1'
#define _802_3_TYPE '2'
static const struct option br802_3_opts[] = {
{ .name = "802_3-sap", .has_arg = true, .val = _802_3_SAP },
{ .name = "802_3-type", .has_arg = true, .val = _802_3_TYPE },
XT_GETOPT_TABLEEND,
};
static void br802_3_print_help(void)
{
printf(
"802_3 options:\n"
"--802_3-sap [!] protocol : 802.3 DSAP/SSAP- 1 byte value (hex)\n"
" DSAP and SSAP are always the same. One SAP applies to both fields\n"
"--802_3-type [!] protocol : 802.3 SNAP Type- 2 byte value (hex)\n"
" Type implies SAP value 0xaa\n");
}
static void br802_3_init(struct xt_entry_match *match)
{
struct ebt_802_3_info *info = (struct ebt_802_3_info *)match->data;
info->invflags = 0;
info->bitmask = 0;
}
static int
br802_3_parse(int c, char **argv, int invert, unsigned int *flags,
const void *entry, struct xt_entry_match **match)
{
struct ebt_802_3_info *info = (struct ebt_802_3_info *) (*match)->data;
unsigned int i;
char *end;
switch (c) {
case _802_3_SAP:
if (invert)
info->invflags |= EBT_802_3_SAP;
i = strtoul(optarg, &end, 16);
if (i > 255 || *end != '\0')
xtables_error(PARAMETER_PROBLEM,
"Problem with specified "
"sap hex value, %x",i);
info->sap = i; /* one byte, so no byte order worries */
info->bitmask |= EBT_802_3_SAP;
break;
case _802_3_TYPE:
if (invert)
info->invflags |= EBT_802_3_TYPE;
i = strtoul(optarg, &end, 16);
if (i > 65535 || *end != '\0') {
xtables_error(PARAMETER_PROBLEM,
"Problem with the specified "
"type hex value, %x",i);
}
info->type = htons(i);
info->bitmask |= EBT_802_3_TYPE;
break;
default:
return 0;
}
*flags |= info->bitmask;
return 1;
}
static void
br802_3_final_check(unsigned int flags)
{
if (!flags)
xtables_error(PARAMETER_PROBLEM,
"You must specify proper arguments");
}
static void br802_3_print(const void *ip, const struct xt_entry_match *match,
int numeric)
{
struct ebt_802_3_info *info = (struct ebt_802_3_info *)match->data;
if (info->bitmask & EBT_802_3_SAP) {
printf("--802_3-sap ");
if (info->invflags & EBT_802_3_SAP)
printf("! ");
printf("0x%.2x ", info->sap);
}
if (info->bitmask & EBT_802_3_TYPE) {
printf("--802_3-type ");
if (info->invflags & EBT_802_3_TYPE)
printf("! ");
printf("0x%.4x ", ntohs(info->type));
}
}
static struct xtables_match br802_3_match =
{
.name = "802_3",
.revision = 0,
.version = XTABLES_VERSION,
.family = NFPROTO_BRIDGE,
.size = XT_ALIGN(sizeof(struct ebt_802_3_info)),
.userspacesize = XT_ALIGN(sizeof(struct ebt_802_3_info)),
.init = br802_3_init,
.help = br802_3_print_help,
.parse = br802_3_parse,
.final_check = br802_3_final_check,
.print = br802_3_print,
.extra_opts = br802_3_opts,
};
void _init(void)
{
xtables_register_match(&br802_3_match);
}
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