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/* ebt_pkttype
*
* Authors:
* Bart De Schuymer <bdschuym@pandora.be>
*
* April, 2003
*/
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <netdb.h>
#include <xtables.h>
#include <linux/if_packet.h>
#include <linux/netfilter_bridge/ebt_pkttype.h>
static const char *classes[] = {
"host",
"broadcast",
"multicast",
"otherhost",
"outgoing",
"loopback",
"fastroute",
};
enum {
O_TYPE,
};
static const struct xt_option_entry brpkttype_opts[] = {
{ .name = "pkttype-type", .id = O_TYPE, .type = XTTYPE_STRING,
.flags = XTOPT_INVERT },
XTOPT_TABLEEND,
};
static void brpkttype_print_help(void)
{
printf(
"pkttype options:\n"
"[!] --pkttype-type type: class the packet belongs to\n"
"Possible values: broadcast, multicast, host, otherhost, or any other byte value (which would be pretty useless).\n");
}
static void brpkttype_parse(struct xt_option_call *cb)
{
struct ebt_pkttype_info *ptinfo = cb->data;
long int i;
char *end;
xtables_option_parse(cb);
switch (cb->entry->id) {
case O_TYPE:
ptinfo->invert = cb->invert;
i = strtol(cb->arg, &end, 16);
if (*end != '\0') {
for (i = 0; i < ARRAY_SIZE(classes); i++) {
if (!strcasecmp(cb->arg, classes[i]))
break;
}
if (i >= ARRAY_SIZE(classes))
xtables_error(PARAMETER_PROBLEM,
"Could not parse class '%s'",
cb->arg);
}
if (i < 0 || i > 255)
xtables_error(PARAMETER_PROBLEM, "Problem with specified pkttype class");
ptinfo->pkt_type = (uint8_t)i;
break;
}
}
static void brpkttype_print(const void *ip, const struct xt_entry_match *match, int numeric)
{
struct ebt_pkttype_info *pt = (struct ebt_pkttype_info *)match->data;
printf("%s--pkttype-type ", pt->invert ? "! " : "");
if (pt->pkt_type < ARRAY_SIZE(classes))
printf("%s ", classes[pt->pkt_type]);
else
printf("%d ", pt->pkt_type);
}
static int brpkttype_xlate(struct xt_xlate *xl,
const struct xt_xlate_mt_params *params)
{
const struct ebt_pkttype_info *info = (const void*)params->match->data;
xt_xlate_add(xl, "meta pkttype %s", info->invert ? "!= " : "");
if (info->pkt_type < 3)
xt_xlate_add(xl, "%s ", classes[info->pkt_type]);
else if (info->pkt_type == 3)
xt_xlate_add(xl, "other ");
else
xt_xlate_add(xl, "%d ", info->pkt_type);
return 1;
}
static struct xtables_match brpkttype_match = {
.name = "pkttype",
.version = XTABLES_VERSION,
.family = NFPROTO_BRIDGE,
.size = XT_ALIGN(sizeof(struct ebt_pkttype_info)),
.userspacesize = XT_ALIGN(sizeof(struct ebt_pkttype_info)),
.help = brpkttype_print_help,
.x6_parse = brpkttype_parse,
.print = brpkttype_print,
.xlate = brpkttype_xlate,
.x6_options = brpkttype_opts,
};
void _init(void)
{
xtables_register_match(&brpkttype_match);
}
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