1 /* (C) 1999-2001 Michal Ludvig <michal@logix.cz>
3 * This program is free software; you can redistribute it and/or modify
4 * it under the terms of the GNU General Public License version 2 as
5 * published by the Free Software Foundation.
8 #include <linux/module.h>
9 #include <linux/skbuff.h>
10 #include <linux/if_ether.h>
11 #include <linux/if_packet.h>
15 #include <linux/netfilter/xt_pkttype.h>
16 #include <linux/netfilter/x_tables.h>
18 MODULE_LICENSE("GPL");
19 MODULE_AUTHOR("Michal Ludvig <michal@logix.cz>");
20 MODULE_DESCRIPTION("IP tables match to match on linklayer packet type");
21 MODULE_ALIAS("ipt_pkttype");
22 MODULE_ALIAS("ip6t_pkttype");
24 static int match(const struct sk_buff
*skb
,
25 const struct net_device
*in
,
26 const struct net_device
*out
,
27 const struct xt_match
*match
,
28 const void *matchinfo
,
34 const struct xt_pkttype_info
*info
= matchinfo
;
36 if (skb
->pkt_type
== PACKET_LOOPBACK
)
37 type
= (MULTICAST(skb
->nh
.iph
->daddr
)
43 return (type
== info
->pkttype
) ^ info
->invert
;
46 static struct xt_match pkttype_match
= {
49 .matchsize
= sizeof(struct xt_pkttype_info
),
54 static struct xt_match pkttype6_match
= {
57 .matchsize
= sizeof(struct xt_pkttype_info
),
62 static int __init
xt_pkttype_init(void)
65 ret
= xt_register_match(&pkttype_match
);
69 ret
= xt_register_match(&pkttype6_match
);
71 xt_unregister_match(&pkttype_match
);
76 static void __exit
xt_pkttype_fini(void)
78 xt_unregister_match(&pkttype_match
);
79 xt_unregister_match(&pkttype6_match
);
82 module_init(xt_pkttype_init
);
83 module_exit(xt_pkttype_fini
);
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