Subversion Repositories or1k_soc_on_altera_embedded_dev_kit

/*

 *  iptables module to match inet_addr_type() of an ip.

 *

 *  Copyright (c) 2004 Patrick McHardy <kaber@trash.net>

 *

 *  This program is free software; you can redistribute it and/or modify

 *  it under the terms of the GNU General Public License version 2 as

 *  published by the Free Software Foundation.

 */

#include <linux/kernel.h>

#include <linux/module.h>

#include <linux/skbuff.h>

#include <linux/netdevice.h>

#include <linux/ip.h>

#include <net/route.h>

#include <linux/netfilter_ipv4/ipt_addrtype.h>

#include <linux/netfilter/x_tables.h>

MODULE_LICENSE("GPL");

MODULE_AUTHOR("Patrick McHardy <kaber@trash.net>");

MODULE_DESCRIPTION("iptables addrtype match");

static inline bool match_type(__be32 addr, u_int16_t mask)

{

        return !!(mask & (1 << inet_addr_type(addr)));

}

static bool match(const struct sk_buff *skb,

                  const struct net_device *in, const struct net_device *out,

                  const struct xt_match *match, const void *matchinfo,

                  int offset, unsigned int protoff, bool *hotdrop)

{

        const struct ipt_addrtype_info *info = matchinfo;

        const struct iphdr *iph = ip_hdr(skb);

        bool ret = true;

        if (info->source)

                ret &= match_type(iph->saddr, info->source)^info->invert_source;

        if (info->dest)

                ret &= match_type(iph->daddr, info->dest)^info->invert_dest;

        return ret;

}

static struct xt_match addrtype_match __read_mostly = {

        .name           = "addrtype",

        .family         = AF_INET,

        .match          = match,

        .matchsize      = sizeof(struct ipt_addrtype_info),

        .me             = THIS_MODULE

};

static int __init ipt_addrtype_init(void)

{

        return xt_register_match(&addrtype_match);

}

static void __exit ipt_addrtype_fini(void)

{

        xt_unregister_match(&addrtype_match);

}

module_init(ipt_addrtype_init);

module_exit(ipt_addrtype_fini);