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Commit | Line | Data |
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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, | |
c4986734 | 25 | const struct xt_match *match, |
1da177e4 LT |
26 | const void *matchinfo, |
27 | int offset, | |
28 | unsigned int protoff, | |
29 | int *hotdrop) | |
30 | { | |
f0daaa65 YK |
31 | unsigned char eui64[8]; |
32 | int i = 0; | |
1da177e4 | 33 | |
f0daaa65 YK |
34 | if (!(skb->mac.raw >= skb->head && |
35 | (skb->mac.raw + ETH_HLEN) <= skb->data) && | |
36 | offset != 0) { | |
37 | *hotdrop = 1; | |
38 | return 0; | |
39 | } | |
40 | ||
41 | memset(eui64, 0, sizeof(eui64)); | |
42 | ||
d8fd0a73 | 43 | if (eth_hdr(skb)->h_proto == htons(ETH_P_IPV6)) { |
f0daaa65 YK |
44 | if (skb->nh.ipv6h->version == 0x6) { |
45 | memcpy(eui64, eth_hdr(skb)->h_source, 3); | |
46 | memcpy(eui64 + 5, eth_hdr(skb)->h_source + 3, 3); | |
47 | eui64[3] = 0xff; | |
48 | eui64[4] = 0xfe; | |
49 | eui64[0] |= 0x02; | |
50 | ||
51 | i = 0; | |
52 | while ((skb->nh.ipv6h->saddr.s6_addr[8+i] == eui64[i]) | |
53 | && (i < 8)) | |
54 | i++; | |
55 | ||
56 | if (i == 8) | |
57 | return 1; | |
58 | } | |
59 | } | |
60 | ||
61 | return 0; | |
1da177e4 LT |
62 | } |
63 | ||
1da177e4 LT |
64 | static struct ip6t_match eui64_match = { |
65 | .name = "eui64", | |
7f939713 PM |
66 | .match = match, |
67 | .matchsize = sizeof(int), | |
68 | .hooks = (1 << NF_IP6_PRE_ROUTING) | (1 << NF_IP6_LOCAL_IN) | | |
69 | (1 << NF_IP6_FORWARD), | |
1da177e4 LT |
70 | .me = THIS_MODULE, |
71 | }; | |
72 | ||
65b4b4e8 | 73 | static int __init ip6t_eui64_init(void) |
1da177e4 LT |
74 | { |
75 | return ip6t_register_match(&eui64_match); | |
76 | } | |
77 | ||
65b4b4e8 | 78 | static void __exit ip6t_eui64_fini(void) |
1da177e4 LT |
79 | { |
80 | ip6t_unregister_match(&eui64_match); | |
81 | } | |
82 | ||
65b4b4e8 AM |
83 | module_init(ip6t_eui64_init); |
84 | module_exit(ip6t_eui64_fini); |