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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, | |
25 | const void *matchinfo, | |
26 | int offset, | |
27 | unsigned int protoff, | |
28 | int *hotdrop) | |
29 | { | |
30 | ||
31 | unsigned char eui64[8]; | |
32 | int i=0; | |
33 | ||
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 | ||
43 | if (eth_hdr(skb)->h_proto == ntohs(ETH_P_IPV6)) { | |
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] == | |
53 | eui64[i]) && (i<8)) i++; | |
54 | ||
55 | if ( i == 8 ) | |
56 | return 1; | |
57 | } | |
58 | } | |
59 | ||
60 | return 0; | |
61 | } | |
62 | ||
63 | static int | |
64 | ip6t_eui64_checkentry(const char *tablename, | |
65 | const struct ip6t_ip6 *ip, | |
66 | void *matchinfo, | |
67 | unsigned int matchsize, | |
68 | unsigned int hook_mask) | |
69 | { | |
70 | if (hook_mask | |
71 | & ~((1 << NF_IP6_PRE_ROUTING) | (1 << NF_IP6_LOCAL_IN) | | |
72 | (1 << NF_IP6_FORWARD))) { | |
73 | printk("ip6t_eui64: only valid for PRE_ROUTING, LOCAL_IN or FORWARD.\n"); | |
74 | return 0; | |
75 | } | |
76 | ||
77 | if (matchsize != IP6T_ALIGN(sizeof(int))) | |
78 | return 0; | |
79 | ||
80 | return 1; | |
81 | } | |
82 | ||
83 | static struct ip6t_match eui64_match = { | |
84 | .name = "eui64", | |
85 | .match = &match, | |
86 | .checkentry = &ip6t_eui64_checkentry, | |
87 | .me = THIS_MODULE, | |
88 | }; | |
89 | ||
90 | static int __init init(void) | |
91 | { | |
92 | return ip6t_register_match(&eui64_match); | |
93 | } | |
94 | ||
95 | static void __exit fini(void) | |
96 | { | |
97 | ip6t_unregister_match(&eui64_match); | |
98 | } | |
99 | ||
100 | module_init(init); | |
101 | module_exit(fini); |