projects / linux-2.6-block.git / blame
| Commit | Line | Data |
|---|---|---|
| 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 | ||
| 6709dbbb | 15 | #include <linux/netfilter/x_tables.h> |
| 1da177e4 LT |
16 | #include <linux/netfilter_ipv6/ip6_tables.h> |
| 17 | ||
| 2ae15b64 | 18 | MODULE_DESCRIPTION("Xtables: IPv6 EUI64 address match"); |
| 1da177e4 LT |
19 | MODULE_LICENSE("GPL"); |
| 20 | MODULE_AUTHOR("Andras Kis-Szabo <kisza@sch.bme.hu>"); | |
| 21 | ||
| 1d93a9cb | 22 | static bool |
| f7108a20 | 23 | eui64_mt6(const struct sk_buff *skb, const struct xt_match_param *par) |
| 1da177e4 | 24 | { |
| f0daaa65 YK |
25 | unsigned char eui64[8]; |
| 26 | int i = 0; | |
| 1da177e4 | 27 | |
| 98e399f8 | 28 | if (!(skb_mac_header(skb) >= skb->head && |
| 7c4e36bc | 29 | skb_mac_header(skb) + ETH_HLEN <= skb->data) && |
| f7108a20 JE |
30 | par->fragoff != 0) { |
| 31 | *par->hotdrop = true; | |
| 1d93a9cb | 32 | return false; |
| f0daaa65 YK |
33 | } |
| 34 | ||
| 35 | memset(eui64, 0, sizeof(eui64)); | |
| 36 | ||
| d8fd0a73 | 37 | if (eth_hdr(skb)->h_proto == htons(ETH_P_IPV6)) { |
| 0660e03f | 38 | if (ipv6_hdr(skb)->version == 0x6) { |
| f0daaa65 YK |
39 | memcpy(eui64, eth_hdr(skb)->h_source, 3); |
| 40 | memcpy(eui64 + 5, eth_hdr(skb)->h_source + 3, 3); | |
| 41 | eui64[3] = 0xff; | |
| 42 | eui64[4] = 0xfe; | |
| 8f41f017 | 43 | eui64[0] ^= 0x02; |
| f0daaa65 YK |
44 | |
| 45 | i = 0; | |
| 7c4e36bc JE |
46 | while (ipv6_hdr(skb)->saddr.s6_addr[8 + i] == eui64[i] |
| 47 | && i < 8) | |
| f0daaa65 YK |
48 | i++; |
| 49 | ||
| 50 | if (i == 8) | |
| 1d93a9cb | 51 | return true; |
| f0daaa65 YK |
52 | } |
| 53 | } | |
| 54 | ||
| 1d93a9cb | 55 | return false; |
| 1da177e4 LT |
56 | } |
| 57 | ||
| d3c5ee6d | 58 | static struct xt_match eui64_mt6_reg __read_mostly = { |
| 1da177e4 | 59 | .name = "eui64", |
| ee999d8b | 60 | .family = NFPROTO_IPV6, |
| d3c5ee6d | 61 | .match = eui64_mt6, |
| 7f939713 | 62 | .matchsize = sizeof(int), |
| 6e23ae2a PM |
63 | .hooks = (1 << NF_INET_PRE_ROUTING) | (1 << NF_INET_LOCAL_IN) | |
| 64 | (1 << NF_INET_FORWARD), | |
| 1da177e4 LT |
65 | .me = THIS_MODULE, |
| 66 | }; | |
| 67 | ||
| d3c5ee6d | 68 | static int __init eui64_mt6_init(void) |
| 1da177e4 | 69 | { |
| d3c5ee6d | 70 | return xt_register_match(&eui64_mt6_reg); |
| 1da177e4 LT |
71 | } |
| 72 | ||
| d3c5ee6d | 73 | static void __exit eui64_mt6_exit(void) |
| 1da177e4 | 74 | { |
| d3c5ee6d | 75 | xt_unregister_match(&eui64_mt6_reg); |
| 1da177e4 LT |
76 | } |
| 77 | ||
| d3c5ee6d JE |
78 | module_init(eui64_mt6_init); |
| 79 | module_exit(eui64_mt6_exit); |