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1da177e4 LT |
1 | /* Kernel module to match EUI64 address parameters. */ |
2 | ||
3 | /* (C) 2001-2002 Andras Kis-Szabo <kisza@sch.bme.hu> | |
4 | * | |
5 | * This program is free software; you can redistribute it and/or modify | |
6 | * it under the terms of the GNU General Public License version 2 as | |
7 | * published by the Free Software Foundation. | |
8 | */ | |
9 | ||
10 | #include <linux/module.h> | |
11 | #include <linux/skbuff.h> | |
12 | #include <linux/ipv6.h> | |
13 | #include <linux/if_ether.h> | |
14 | ||
15 | #include <linux/netfilter_ipv6/ip6_tables.h> | |
16 | ||
17 | MODULE_DESCRIPTION("IPv6 EUI64 address checking match"); | |
18 | MODULE_LICENSE("GPL"); | |
19 | MODULE_AUTHOR("Andras Kis-Szabo <kisza@sch.bme.hu>"); | |
20 | ||
21 | static int | |
22 | match(const struct sk_buff *skb, | |
23 | const struct net_device *in, | |
24 | const struct net_device *out, | |
25 | const void *matchinfo, | |
26 | int offset, | |
27 | unsigned int protoff, | |
28 | int *hotdrop) | |
29 | { | |
f0daaa65 YK |
30 | unsigned char eui64[8]; |
31 | int i = 0; | |
1da177e4 | 32 | |
f0daaa65 YK |
33 | if (!(skb->mac.raw >= skb->head && |
34 | (skb->mac.raw + ETH_HLEN) <= skb->data) && | |
35 | offset != 0) { | |
36 | *hotdrop = 1; | |
37 | return 0; | |
38 | } | |
39 | ||
40 | memset(eui64, 0, sizeof(eui64)); | |
41 | ||
42 | if (eth_hdr(skb)->h_proto == ntohs(ETH_P_IPV6)) { | |
43 | if (skb->nh.ipv6h->version == 0x6) { | |
44 | memcpy(eui64, eth_hdr(skb)->h_source, 3); | |
45 | memcpy(eui64 + 5, eth_hdr(skb)->h_source + 3, 3); | |
46 | eui64[3] = 0xff; | |
47 | eui64[4] = 0xfe; | |
48 | eui64[0] |= 0x02; | |
49 | ||
50 | i = 0; | |
51 | while ((skb->nh.ipv6h->saddr.s6_addr[8+i] == eui64[i]) | |
52 | && (i < 8)) | |
53 | i++; | |
54 | ||
55 | if (i == 8) | |
56 | return 1; | |
57 | } | |
58 | } | |
59 | ||
60 | return 0; | |
1da177e4 LT |
61 | } |
62 | ||
1da177e4 LT |
63 | static struct ip6t_match eui64_match = { |
64 | .name = "eui64", | |
7f939713 PM |
65 | .match = match, |
66 | .matchsize = sizeof(int), | |
67 | .hooks = (1 << NF_IP6_PRE_ROUTING) | (1 << NF_IP6_LOCAL_IN) | | |
68 | (1 << NF_IP6_FORWARD), | |
1da177e4 LT |
69 | .me = THIS_MODULE, |
70 | }; | |
71 | ||
72 | static int __init init(void) | |
73 | { | |
74 | return ip6t_register_match(&eui64_match); | |
75 | } | |
76 | ||
77 | static void __exit fini(void) | |
78 | { | |
79 | ip6t_unregister_match(&eui64_match); | |
80 | } | |
81 | ||
82 | module_init(init); | |
83 | module_exit(fini); |