root/net/bridge/netfilter/ebt_nflog.c

DEFINITIONS

1. ebt_nflog_tg
2. ebt_nflog_tg_check
3. ebt_nflog_init
4. ebt_nflog_fini

/*
 * ebt_nflog
 *
 *      Author:
 *      Peter Warasin <peter@endian.com>
 *
 *  February, 2008
 *
 * Based on:
 *  xt_NFLOG.c, (C) 2006 by Patrick McHardy <kaber@trash.net>
 *  ebt_ulog.c, (C) 2004 by Bart De Schuymer <bdschuym@pandora.be>
 *
 */

#include <linux/module.h>
#include <linux/spinlock.h>
#include <linux/netfilter/x_tables.h>
#include <linux/netfilter_bridge/ebtables.h>
#include <linux/netfilter_bridge/ebt_nflog.h>
#include <net/netfilter/nf_log.h>

static unsigned int
ebt_nflog_tg(struct sk_buff *skb, const struct xt_target_param *par)
{
        const struct ebt_nflog_info *info = par->targinfo;
        struct nf_loginfo li;

        li.type = NF_LOG_TYPE_ULOG;
        li.u.ulog.copy_len = info->len;
        li.u.ulog.group = info->group;
        li.u.ulog.qthreshold = info->threshold;

        nf_log_packet(PF_BRIDGE, par->hooknum, skb, par->in, par->out,
                      &li, "%s", info->prefix);
        return EBT_CONTINUE;
}

static bool ebt_nflog_tg_check(const struct xt_tgchk_param *par)
{
        struct ebt_nflog_info *info = par->targinfo;

        if (info->flags & ~EBT_NFLOG_MASK)
                return false;
        info->prefix[EBT_NFLOG_PREFIX_SIZE - 1] = '\0';
        return true;
}

static struct xt_target ebt_nflog_tg_reg __read_mostly = {
        .name       = "nflog",
        .revision   = 0,
        .family     = NFPROTO_BRIDGE,
        .target     = ebt_nflog_tg,
        .checkentry = ebt_nflog_tg_check,
        .targetsize = XT_ALIGN(sizeof(struct ebt_nflog_info)),
        .me         = THIS_MODULE,
};

static int __init ebt_nflog_init(void)
{
        return xt_register_target(&ebt_nflog_tg_reg);
}

static void __exit ebt_nflog_fini(void)
{
        xt_unregister_target(&ebt_nflog_tg_reg);
}

module_init(ebt_nflog_init);
module_exit(ebt_nflog_fini);
MODULE_LICENSE("GPL");
MODULE_AUTHOR("Peter Warasin <peter@endian.com>");
MODULE_DESCRIPTION("ebtables NFLOG netfilter logging module");