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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#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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static int
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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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const void *matchinfo,
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int offset,
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unsigned int protoff,
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int *hotdrop)
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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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2006-01-17 03:39:39 -07:00
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if (!(skb->mac.raw >= skb->head &&
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(skb->mac.raw + ETH_HLEN) <= skb->data) &&
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offset != 0) {
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*hotdrop = 1;
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return 0;
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}
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memset(eui64, 0, sizeof(eui64));
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if (eth_hdr(skb)->h_proto == ntohs(ETH_P_IPV6)) {
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if (skb->nh.ipv6h->version == 0x6) {
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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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while ((skb->nh.ipv6h->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 1;
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}
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}
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return 0;
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2005-04-16 16:20:36 -06:00
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}
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static int
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ip6t_eui64_checkentry(const char *tablename,
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2006-01-17 03:39:39 -07:00
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const void *ip,
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void *matchinfo,
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unsigned int matchsize,
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unsigned int hook_mask)
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2005-04-16 16:20:36 -06:00
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{
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if (hook_mask
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& ~((1 << NF_IP6_PRE_ROUTING) | (1 << NF_IP6_LOCAL_IN) |
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(1 << NF_IP6_FORWARD))) {
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printk("ip6t_eui64: only valid for PRE_ROUTING, LOCAL_IN or FORWARD.\n");
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return 0;
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}
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if (matchsize != IP6T_ALIGN(sizeof(int)))
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return 0;
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return 1;
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}
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static struct ip6t_match eui64_match = {
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.name = "eui64",
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.match = &match,
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.checkentry = &ip6t_eui64_checkentry,
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.me = THIS_MODULE,
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};
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static int __init init(void)
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{
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return ip6t_register_match(&eui64_match);
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}
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static void __exit fini(void)
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{
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ip6t_unregister_match(&eui64_match);
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}
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module_init(init);
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module_exit(fini);
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