root/net/bridge/netfilter/ebt_mark_m.c

DEFINITIONS

1. ebt_mark_mt
2. ebt_mark_mt_check
3. ebt_mark_m_init
4. ebt_mark_m_fini

/*
 *  ebt_mark_m
 *
 *      Authors:
 *      Bart De Schuymer <bdschuym@pandora.be>
 *
 *  July, 2002
 *
 */
#include <linux/module.h>
#include <linux/netfilter/x_tables.h>
#include <linux/netfilter_bridge/ebtables.h>
#include <linux/netfilter_bridge/ebt_mark_m.h>

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

        if (info->bitmask & EBT_MARK_OR)
                return !!(skb->mark & info->mask) ^ info->invert;
        return ((skb->mark & info->mask) == info->mark) ^ info->invert;
}

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

        if (info->bitmask & ~EBT_MARK_MASK)
                return false;
        if ((info->bitmask & EBT_MARK_OR) && (info->bitmask & EBT_MARK_AND))
                return false;
        if (!info->bitmask)
                return false;
        return true;
}

static struct xt_match ebt_mark_mt_reg __read_mostly = {
        .name           = "mark_m",
        .revision       = 0,
        .family         = NFPROTO_BRIDGE,
        .match          = ebt_mark_mt,
        .checkentry     = ebt_mark_mt_check,
        .matchsize      = XT_ALIGN(sizeof(struct ebt_mark_m_info)),
        .me             = THIS_MODULE,
};

static int __init ebt_mark_m_init(void)
{
        return xt_register_match(&ebt_mark_mt_reg);
}

static void __exit ebt_mark_m_fini(void)
{
        xt_unregister_match(&ebt_mark_mt_reg);
}

module_init(ebt_mark_m_init);
module_exit(ebt_mark_m_fini);
MODULE_DESCRIPTION("Ebtables: Packet mark match");
MODULE_LICENSE("GPL");