ia64/linux-2.6.18-xen.hg

view net/netfilter/xt_pkttype.c @ 0:831230e53067

Import 2.6.18 from kernel.org tarball.
author Ian Campbell <ian.campbell@xensource.com>
date Wed Apr 11 14:15:44 2007 +0100 (2007-04-11)
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1 /* (C) 1999-2001 Michal Ludvig <michal@logix.cz>
2 *
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.
6 */
8 #include <linux/module.h>
9 #include <linux/skbuff.h>
10 #include <linux/if_ether.h>
11 #include <linux/if_packet.h>
12 #include <linux/in.h>
13 #include <linux/ip.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,
29 int offset,
30 unsigned int protoff,
31 int *hotdrop)
32 {
33 u_int8_t type;
34 const struct xt_pkttype_info *info = matchinfo;
36 if (skb->pkt_type == PACKET_LOOPBACK)
37 type = (MULTICAST(skb->nh.iph->daddr)
38 ? PACKET_MULTICAST
39 : PACKET_BROADCAST);
40 else
41 type = skb->pkt_type;
43 return (type == info->pkttype) ^ info->invert;
44 }
46 static struct xt_match pkttype_match = {
47 .name = "pkttype",
48 .match = match,
49 .matchsize = sizeof(struct xt_pkttype_info),
50 .family = AF_INET,
51 .me = THIS_MODULE,
52 };
54 static struct xt_match pkttype6_match = {
55 .name = "pkttype",
56 .match = match,
57 .matchsize = sizeof(struct xt_pkttype_info),
58 .family = AF_INET6,
59 .me = THIS_MODULE,
60 };
62 static int __init xt_pkttype_init(void)
63 {
64 int ret;
65 ret = xt_register_match(&pkttype_match);
66 if (ret)
67 return ret;
69 ret = xt_register_match(&pkttype6_match);
70 if (ret)
71 xt_unregister_match(&pkttype_match);
73 return ret;
74 }
76 static void __exit xt_pkttype_fini(void)
77 {
78 xt_unregister_match(&pkttype_match);
79 xt_unregister_match(&pkttype6_match);
80 }
82 module_init(xt_pkttype_init);
83 module_exit(xt_pkttype_fini);