projects / deliverable / linux.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 | ||
| 18 | MODULE_DESCRIPTION("IPv6 EUI64 address checking match"); | |
| 19 | MODULE_LICENSE("GPL"); | |
| 20 | MODULE_AUTHOR("Andras Kis-Szabo <kisza@sch.bme.hu>"); | |
| 21 | ||
| 22 | static int | |
| 23 | match(const struct sk_buff *skb, | |
| 24 | const struct net_device *in, | |
| 25 | const struct net_device *out, | |
| c4986734 | 26 | const struct xt_match *match, |
| 1da177e4 LT |
27 | const void *matchinfo, |
| 28 | int offset, | |
| 29 | unsigned int protoff, | |
| 30 | int *hotdrop) | |
| 31 | { | |
| f0daaa65 YK |
32 | unsigned char eui64[8]; |
| 33 | int i = 0; | |
| 1da177e4 | 34 | |
| f0daaa65 YK |
35 | if (!(skb->mac.raw >= skb->head && |
| 36 | (skb->mac.raw + ETH_HLEN) <= skb->data) && | |
| 37 | offset != 0) { | |
| 38 | *hotdrop = 1; | |
| 39 | return 0; | |
| 40 | } | |
| 41 | ||
| 42 | memset(eui64, 0, sizeof(eui64)); | |
| 43 | ||
| d8fd0a73 | 44 | if (eth_hdr(skb)->h_proto == htons(ETH_P_IPV6)) { |
| f0daaa65 YK |
45 | if (skb->nh.ipv6h->version == 0x6) { |
| 46 | memcpy(eui64, eth_hdr(skb)->h_source, 3); | |
| 47 | memcpy(eui64 + 5, eth_hdr(skb)->h_source + 3, 3); | |
| 48 | eui64[3] = 0xff; | |
| 49 | eui64[4] = 0xfe; | |
| 50 | eui64[0] |= 0x02; | |
| 51 | ||
| 52 | i = 0; | |
| 53 | while ((skb->nh.ipv6h->saddr.s6_addr[8+i] == eui64[i]) | |
| 54 | && (i < 8)) | |
| 55 | i++; | |
| 56 | ||
| 57 | if (i == 8) | |
| 58 | return 1; | |
| 59 | } | |
| 60 | } | |
| 61 | ||
| 62 | return 0; | |
| 1da177e4 LT |
63 | } |
| 64 | ||
| 6709dbbb | 65 | static struct xt_match eui64_match = { |
| 1da177e4 | 66 | .name = "eui64", |
| 6709dbbb | 67 | .family = AF_INET6, |
| 7f939713 PM |
68 | .match = match, |
| 69 | .matchsize = sizeof(int), | |
| 70 | .hooks = (1 << NF_IP6_PRE_ROUTING) | (1 << NF_IP6_LOCAL_IN) | | |
| 71 | (1 << NF_IP6_FORWARD), | |
| 1da177e4 LT |
72 | .me = THIS_MODULE, |
| 73 | }; | |
| 74 | ||
| 65b4b4e8 | 75 | static int __init ip6t_eui64_init(void) |
| 1da177e4 | 76 | { |
| 6709dbbb | 77 | return xt_register_match(&eui64_match); |
| 1da177e4 LT |
78 | } |
| 79 | ||
| 65b4b4e8 | 80 | static void __exit ip6t_eui64_fini(void) |
| 1da177e4 | 81 | { |
| 6709dbbb | 82 | xt_unregister_match(&eui64_match); |
| 1da177e4 LT |
83 | } |
| 84 | ||
| 65b4b4e8 AM |
85 | module_init(ip6t_eui64_init); |
| 86 | module_exit(ip6t_eui64_fini); |