71 lines
1.6 KiB
C
71 lines
1.6 KiB
C
/* (C) 1999-2001 Michal Ludvig <michal@logix.cz>
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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/if_ether.h>
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#include <linux/if_packet.h>
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#include <linux/netfilter_ipv4/ipt_pkttype.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("Michal Ludvig <michal@logix.cz>");
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MODULE_DESCRIPTION("IP tables match to match on linklayer packet type");
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static int 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_pkttype_info *info = matchinfo;
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return (skb->pkt_type == info->pkttype) ^ info->invert;
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}
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static int checkentry(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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/*
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if (hook_mask
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& ~((1 << NF_IP_PRE_ROUTING) | (1 << NF_IP_LOCAL_IN)
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| (1 << NF_IP_FORWARD))) {
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printk("ipt_pkttype: only valid for PRE_ROUTING, LOCAL_IN or FORWARD.\n");
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return 0;
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}
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*/
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if (matchsize != IPT_ALIGN(sizeof(struct ipt_pkttype_info)))
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return 0;
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return 1;
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}
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static struct ipt_match pkttype_match = {
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.name = "pkttype",
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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(&pkttype_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(&pkttype_match);
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}
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module_init(init);
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module_exit(fini);
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