root/net/bridge/netfilter/ebt_pkttype.c

DEFINITIONS

1. ebt_pkttype_mt
2. ebt_pkttype_mt_check
3. ebt_pkttype_init
4. ebt_pkttype_fini

/*
 *  ebt_pkttype
 *
 *      Authors:
 *      Bart De Schuymer <bdschuym@pandora.be>
 *
 *  April, 2003
 *
 */
#include <linux/module.h>
#include <linux/netfilter/x_tables.h>
#include <linux/netfilter_bridge/ebtables.h>
#include <linux/netfilter_bridge/ebt_pkttype.h>

static bool
ebt_pkttype_mt(const struct sk_buff *skb, const struct xt_match_param *par)
{
        const struct ebt_pkttype_info *info = par->matchinfo;

        return (skb->pkt_type == info->pkt_type) ^ info->invert;
}

static bool ebt_pkttype_mt_check(const struct xt_mtchk_param *par)
{
        const struct ebt_pkttype_info *info = par->matchinfo;

        if (info->invert != 0 && info->invert != 1)
                return false;
        /* Allow any pkt_type value */
        return true;
}

static struct xt_match ebt_pkttype_mt_reg __read_mostly = {
        .name           = "pkttype",
        .revision       = 0,
        .family         = NFPROTO_BRIDGE,
        .match          = ebt_pkttype_mt,
        .checkentry     = ebt_pkttype_mt_check,
        .matchsize      = XT_ALIGN(sizeof(struct ebt_pkttype_info)),
        .me             = THIS_MODULE,
};

static int __init ebt_pkttype_init(void)
{
        return xt_register_match(&ebt_pkttype_mt_reg);
}

static void __exit ebt_pkttype_fini(void)
{
        xt_unregister_match(&ebt_pkttype_mt_reg);
}

module_init(ebt_pkttype_init);
module_exit(ebt_pkttype_fini);
MODULE_DESCRIPTION("Ebtables: Link layer packet type match");
MODULE_LICENSE("GPL");