2005-04-17 06:20:36 +08:00
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/*
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* iptables module to match inet_addr_type() of an ip.
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*
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* Copyright (c) 2004 Patrick McHardy <kaber@trash.net>
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*
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* This program is free software; you can redistribute it and/or modify
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* it under the terms of the GNU General Public License version 2 as
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* published by the Free Software Foundation.
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*/
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#include <linux/kernel.h>
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#include <linux/module.h>
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#include <linux/skbuff.h>
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#include <linux/netdevice.h>
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#include <linux/ip.h>
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#include <net/route.h>
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#include <linux/netfilter_ipv4/ipt_addrtype.h>
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#include <linux/netfilter_ipv4/ip_tables.h>
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MODULE_LICENSE("GPL");
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MODULE_AUTHOR("Patrick McHardy <kaber@trash.net>");
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MODULE_DESCRIPTION("iptables addrtype match");
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static inline int match_type(u_int32_t addr, u_int16_t mask)
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{
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return !!(mask & (1 << inet_addr_type(addr)));
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}
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static int match(const struct sk_buff *skb, const struct net_device *in,
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const struct net_device *out, const void *matchinfo,
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int offset, int *hotdrop)
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{
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const struct ipt_addrtype_info *info = matchinfo;
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const struct iphdr *iph = skb->nh.iph;
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int ret = 1;
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if (info->source)
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ret &= match_type(iph->saddr, info->source)^info->invert_source;
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if (info->dest)
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ret &= match_type(iph->daddr, info->dest)^info->invert_dest;
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return ret;
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}
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static int checkentry(const char *tablename, const struct ipt_ip *ip,
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void *matchinfo, unsigned int matchsize,
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unsigned int hook_mask)
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{
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if (matchsize != IPT_ALIGN(sizeof(struct ipt_addrtype_info))) {
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2005-10-31 07:02:23 +08:00
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printk(KERN_ERR "ipt_addrtype: invalid size (%u != %Zu)\n",
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2005-04-17 06:20:36 +08:00
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matchsize, IPT_ALIGN(sizeof(struct ipt_addrtype_info)));
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return 0;
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}
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return 1;
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}
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static struct ipt_match addrtype_match = {
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.name = "addrtype",
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.match = match,
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.checkentry = checkentry,
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.me = THIS_MODULE
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};
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static int __init init(void)
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{
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return ipt_register_match(&addrtype_match);
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}
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static void __exit fini(void)
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{
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ipt_unregister_match(&addrtype_match);
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}
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module_init(init);
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module_exit(fini);
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