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 bool 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(ip_hdr(skb
)->daddr
)
43 return (type
== info
->pkttype
) ^ info
->invert
;
46 static struct xt_match xt_pkttype_match
[] __read_mostly
= {
51 .matchsize
= sizeof(struct xt_pkttype_info
),
58 .matchsize
= sizeof(struct xt_pkttype_info
),
63 static int __init
xt_pkttype_init(void)
65 return xt_register_matches(xt_pkttype_match
,
66 ARRAY_SIZE(xt_pkttype_match
));
69 static void __exit
xt_pkttype_fini(void)
71 xt_unregister_matches(xt_pkttype_match
, ARRAY_SIZE(xt_pkttype_match
));
74 module_init(xt_pkttype_init
);
75 module_exit(xt_pkttype_fini
);