ebt_pkttype.c

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/*
 *  ebt_pkttype
 *
 *  Authors:
 *  Bart De Schuymer <[email protected]>
 *
 *  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, struct xt_action_param *par)
{
    const struct ebt_pkttype_info *info = par->matchinfo;

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

static int 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 -EINVAL;
    /* Allow any pkt_type value */
    return 0;
}

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  = 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");