77 lines
1.9 KiB
C
77 lines
1.9 KiB
C
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/* IP tables module for matching the routing realm
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*
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* $Id: ipt_realm.c,v 1.3 2004/03/05 13:25:40 laforge Exp $
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*
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* (C) 2003 by Sampsa Ranta <sampsa@netsonic.fi>
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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/module.h>
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#include <linux/skbuff.h>
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#include <linux/netdevice.h>
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#include <net/route.h>
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#include <linux/netfilter_ipv4/ipt_realm.h>
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#include <linux/netfilter_ipv4/ip_tables.h>
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MODULE_AUTHOR("Sampsa Ranta <sampsa@netsonic.fi>");
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MODULE_LICENSE("GPL");
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MODULE_DESCRIPTION("iptables realm match");
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static int
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match(const struct sk_buff *skb,
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const struct net_device *in,
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const struct net_device *out,
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const void *matchinfo,
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int offset,
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int *hotdrop)
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{
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const struct ipt_realm_info *info = matchinfo;
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struct dst_entry *dst = skb->dst;
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return (info->id == (dst->tclassid & info->mask)) ^ info->invert;
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}
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static int check(const char *tablename,
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const struct ipt_ip *ip,
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void *matchinfo,
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unsigned int matchsize,
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unsigned int hook_mask)
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{
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if (hook_mask
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& ~((1 << NF_IP_POST_ROUTING) | (1 << NF_IP_FORWARD) |
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(1 << NF_IP_LOCAL_OUT) | (1 << NF_IP_LOCAL_IN))) {
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printk("ipt_realm: only valid for POST_ROUTING, LOCAL_OUT, "
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"LOCAL_IN or FORWARD.\n");
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return 0;
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}
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if (matchsize != IPT_ALIGN(sizeof(struct ipt_realm_info))) {
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printk("ipt_realm: invalid matchsize.\n");
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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 realm_match = {
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.name = "realm",
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.match = match,
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.checkentry = check,
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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(&realm_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(&realm_match);
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}
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module_init(init);
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module_exit(fini);
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