2005-04-16 16:20:36 -06:00
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/* Kernel module to match EUI64 address parameters. */
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/* (C) 2001-2002 Andras Kis-Szabo <kisza@sch.bme.hu>
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*
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* This program is free software; you can redistribute it and/or modify
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* it under the terms of the GNU General Public License version 2 as
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* published by the Free Software Foundation.
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*/
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#include <linux/module.h>
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#include <linux/skbuff.h>
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#include <linux/ipv6.h>
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#include <linux/if_ether.h>
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2007-02-07 16:11:19 -07:00
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#include <linux/netfilter/x_tables.h>
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2005-04-16 16:20:36 -06:00
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#include <linux/netfilter_ipv6/ip6_tables.h>
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MODULE_DESCRIPTION("IPv6 EUI64 address checking match");
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MODULE_LICENSE("GPL");
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MODULE_AUTHOR("Andras Kis-Szabo <kisza@sch.bme.hu>");
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2007-07-07 23:15:35 -06:00
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static bool
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2005-04-16 16:20:36 -06:00
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match(const struct sk_buff *skb,
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const struct net_device *in,
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const struct net_device *out,
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2006-03-20 19:02:56 -07:00
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const struct xt_match *match,
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const void *matchinfo,
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int offset,
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unsigned int protoff,
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bool *hotdrop)
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2005-04-16 16:20:36 -06:00
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{
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2006-01-17 03:39:39 -07:00
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unsigned char eui64[8];
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int i = 0;
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2005-04-16 16:20:36 -06:00
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2007-03-19 16:33:04 -06:00
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if (!(skb_mac_header(skb) >= skb->head &&
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(skb_mac_header(skb) + ETH_HLEN) <= skb->data) &&
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offset != 0) {
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*hotdrop = true;
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return false;
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2006-01-17 03:39:39 -07:00
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}
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memset(eui64, 0, sizeof(eui64));
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2006-05-16 16:24:41 -06:00
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if (eth_hdr(skb)->h_proto == htons(ETH_P_IPV6)) {
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2007-04-25 18:54:47 -06:00
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if (ipv6_hdr(skb)->version == 0x6) {
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2006-01-17 03:39:39 -07:00
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memcpy(eui64, eth_hdr(skb)->h_source, 3);
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memcpy(eui64 + 5, eth_hdr(skb)->h_source + 3, 3);
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eui64[3] = 0xff;
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eui64[4] = 0xfe;
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eui64[0] |= 0x02;
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i = 0;
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2007-04-25 18:54:47 -06:00
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while ((ipv6_hdr(skb)->saddr.s6_addr[8 + i] == eui64[i])
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&& (i < 8))
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i++;
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if (i == 8)
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return true;
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}
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}
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2007-07-07 23:15:35 -06:00
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return false;
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2005-04-16 16:20:36 -06:00
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}
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2007-02-07 16:11:19 -07:00
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static struct xt_match eui64_match = {
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.name = "eui64",
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.family = AF_INET6,
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2006-03-20 19:01:43 -07:00
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.match = match,
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.matchsize = sizeof(int),
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.hooks = (1 << NF_IP6_PRE_ROUTING) | (1 << NF_IP6_LOCAL_IN) |
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(1 << NF_IP6_FORWARD),
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.me = THIS_MODULE,
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};
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2006-03-28 17:37:06 -07:00
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static int __init ip6t_eui64_init(void)
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{
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return xt_register_match(&eui64_match);
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2005-04-16 16:20:36 -06:00
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}
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2006-03-28 17:37:06 -07:00
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static void __exit ip6t_eui64_fini(void)
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{
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xt_unregister_match(&eui64_match);
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}
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2006-03-28 17:37:06 -07:00
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module_init(ip6t_eui64_init);
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module_exit(ip6t_eui64_fini);
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