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git.proxmox.com Git - mirror_ubuntu-artful-kernel.git/blob - net/netfilter/xt_pkttype.c
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
, const struct net_device
*in
,
27 const struct net_device
*out
, const struct xt_match
*match
,
28 const void *matchinfo
, int offset
, unsigned int protoff
,
31 const struct xt_pkttype_info
*info
= matchinfo
;
34 if (skb
->pkt_type
!= PACKET_LOOPBACK
)
36 else if (match
->family
== AF_INET
&&
37 ipv4_is_multicast(ip_hdr(skb
)->daddr
))
38 type
= PACKET_MULTICAST
;
39 else if (match
->family
== AF_INET6
&&
40 ipv6_hdr(skb
)->daddr
.s6_addr
[0] == 0xFF)
41 type
= PACKET_MULTICAST
;
43 type
= PACKET_BROADCAST
;
45 return (type
== info
->pkttype
) ^ info
->invert
;
48 static struct xt_match pkttype_mt_reg
[] __read_mostly
= {
53 .matchsize
= sizeof(struct xt_pkttype_info
),
60 .matchsize
= sizeof(struct xt_pkttype_info
),
65 static int __init
pkttype_mt_init(void)
67 return xt_register_matches(pkttype_mt_reg
, ARRAY_SIZE(pkttype_mt_reg
));
70 static void __exit
pkttype_mt_exit(void)
72 xt_unregister_matches(pkttype_mt_reg
, ARRAY_SIZE(pkttype_mt_reg
));
75 module_init(pkttype_mt_init
);
76 module_exit(pkttype_mt_exit
);