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>
14 #include <linux/ipv6.h>
16 #include <linux/netfilter/xt_pkttype.h>
17 #include <linux/netfilter/x_tables.h>
19 MODULE_LICENSE("GPL");
20 MODULE_AUTHOR("Michal Ludvig <michal@logix.cz>");
21 MODULE_DESCRIPTION("Xtables: link layer packet type match");
22 MODULE_ALIAS("ipt_pkttype");
23 MODULE_ALIAS("ip6t_pkttype");
26 pkttype_mt(const struct sk_buff
*skb
, struct xt_action_param
*par
)
28 const struct xt_pkttype_info
*info
= par
->matchinfo
;
31 if (skb
->pkt_type
!= PACKET_LOOPBACK
)
33 else if (par
->family
== NFPROTO_IPV4
&&
34 ipv4_is_multicast(ip_hdr(skb
)->daddr
))
35 type
= PACKET_MULTICAST
;
36 else if (par
->family
== NFPROTO_IPV6
&&
37 ipv6_hdr(skb
)->daddr
.s6_addr
[0] == 0xFF)
38 type
= PACKET_MULTICAST
;
40 type
= PACKET_BROADCAST
;
42 return (type
== info
->pkttype
) ^ info
->invert
;
45 static struct xt_match pkttype_mt_reg __read_mostly
= {
48 .family
= NFPROTO_UNSPEC
,
50 .matchsize
= sizeof(struct xt_pkttype_info
),
54 static int __init
pkttype_mt_init(void)
56 return xt_register_match(&pkttype_mt_reg
);
59 static void __exit
pkttype_mt_exit(void)
61 xt_unregister_match(&pkttype_mt_reg
);
64 module_init(pkttype_mt_init
);
65 module_exit(pkttype_mt_exit
);