projects / linux-block.git / blame
| Commit | Line | Data |
|---|---|---|
| 1da177e4 LT |
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 | */ | |
| 7 | ||
| 8 | #include <linux/module.h> | |
| 9 | #include <linux/skbuff.h> | |
| 10 | #include <linux/if_ether.h> | |
| 11 | #include <linux/if_packet.h> | |
| 28658c89 PO |
12 | #include <linux/in.h> |
| 13 | #include <linux/ip.h> | |
| 1da177e4 | 14 | |
| 2e4e6a17 HW |
15 | #include <linux/netfilter/xt_pkttype.h> |
| 16 | #include <linux/netfilter/x_tables.h> | |
| 1da177e4 LT |
17 | |
| 18 | MODULE_LICENSE("GPL"); | |
| 19 | MODULE_AUTHOR("Michal Ludvig <michal@logix.cz>"); | |
| 20 | MODULE_DESCRIPTION("IP tables match to match on linklayer packet type"); | |
| 2e4e6a17 HW |
21 | MODULE_ALIAS("ipt_pkttype"); |
| 22 | MODULE_ALIAS("ip6t_pkttype"); | |
| 1da177e4 LT |
23 | |
| 24 | static int match(const struct sk_buff *skb, | |
| 25 | const struct net_device *in, | |
| 26 | const struct net_device *out, | |
| c4986734 | 27 | const struct xt_match *match, |
| 1da177e4 LT |
28 | const void *matchinfo, |
| 29 | int offset, | |
| 2e4e6a17 | 30 | unsigned int protoff, |
| 1da177e4 LT |
31 | int *hotdrop) |
| 32 | { | |
| 28658c89 | 33 | u_int8_t type; |
| 2e4e6a17 | 34 | const struct xt_pkttype_info *info = matchinfo; |
| 1da177e4 | 35 | |
| 28658c89 PO |
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; | |
| 42 | ||
| 43 | return (type == info->pkttype) ^ info->invert; | |
| 1da177e4 LT |
44 | } |
| 45 | ||
| 4470bbc7 PM |
46 | static struct xt_match xt_pkttype_match[] = { |
| 47 | { | |
| 48 | .name = "pkttype", | |
| 49 | .family = AF_INET, | |
| 50 | .match = match, | |
| 51 | .matchsize = sizeof(struct xt_pkttype_info), | |
| 52 | .me = THIS_MODULE, | |
| 53 | }, | |
| 54 | { | |
| 55 | .name = "pkttype", | |
| 56 | .family = AF_INET6, | |
| 57 | .match = match, | |
| 58 | .matchsize = sizeof(struct xt_pkttype_info), | |
| 59 | .me = THIS_MODULE, | |
| 60 | }, | |
| 2e4e6a17 HW |
61 | }; |
| 62 | ||
| 65b4b4e8 | 63 | static int __init xt_pkttype_init(void) |
| 1da177e4 | 64 | { |
| 4470bbc7 PM |
65 | return xt_register_matches(xt_pkttype_match, |
| 66 | ARRAY_SIZE(xt_pkttype_match)); | |
| 1da177e4 LT |
67 | } |
| 68 | ||
| 65b4b4e8 | 69 | static void __exit xt_pkttype_fini(void) |
| 1da177e4 | 70 | { |
| 4470bbc7 | 71 | xt_unregister_matches(xt_pkttype_match, ARRAY_SIZE(xt_pkttype_match)); |
| 1da177e4 LT |
72 | } |
| 73 | ||
| 65b4b4e8 AM |
74 | module_init(xt_pkttype_init); |
| 75 | module_exit(xt_pkttype_fini); |