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- /*
- * 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 int match_type(__be32 addr, u_int16_t mask)
- {
- return !!(mask & (1 << inet_addr_type(addr)));
- }
- static int 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, int *hotdrop)
- {
- const struct ipt_addrtype_info *info = matchinfo;
- const struct iphdr *iph = skb->nh.iph;
- int ret = 1;
- 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 = {
- .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);
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