| /* Kernel module to match EUI64 address parameters. */ |
| |
| /* (C) 2001-2002 Andras Kis-Szabo <kisza@sch.bme.hu> |
| * |
| * This program is free software; you can redistribute it and/or modify |
| * it under the terms of the GNU General Public License version 2 as |
| * published by the Free Software Foundation. |
| */ |
| |
| #include <linux/module.h> |
| #include <linux/skbuff.h> |
| #include <linux/ipv6.h> |
| #include <linux/if_ether.h> |
| |
| #include <linux/netfilter/x_tables.h> |
| #include <linux/netfilter_ipv6/ip6_tables.h> |
| |
| MODULE_DESCRIPTION("Xtables: IPv6 EUI64 address match"); |
| MODULE_LICENSE("GPL"); |
| MODULE_AUTHOR("Andras Kis-Szabo <kisza@sch.bme.hu>"); |
| |
| static bool |
| eui64_mt6(const struct sk_buff *skb, struct xt_action_param *par) |
| { |
| unsigned char eui64[8]; |
| |
| if (!(skb_mac_header(skb) >= skb->head && |
| skb_mac_header(skb) + ETH_HLEN <= skb->data) && |
| par->fragoff != 0) { |
| par->hotdrop = true; |
| return false; |
| } |
| |
| memset(eui64, 0, sizeof(eui64)); |
| |
| if (eth_hdr(skb)->h_proto == htons(ETH_P_IPV6)) { |
| if (ipv6_hdr(skb)->version == 0x6) { |
| memcpy(eui64, eth_hdr(skb)->h_source, 3); |
| memcpy(eui64 + 5, eth_hdr(skb)->h_source + 3, 3); |
| eui64[3] = 0xff; |
| eui64[4] = 0xfe; |
| eui64[0] ^= 0x02; |
| |
| if (!memcmp(ipv6_hdr(skb)->saddr.s6_addr + 8, eui64, |
| sizeof(eui64))) |
| return true; |
| } |
| } |
| |
| return false; |
| } |
| |
| static struct xt_match eui64_mt6_reg __read_mostly = { |
| .name = "eui64", |
| .family = NFPROTO_IPV6, |
| .match = eui64_mt6, |
| .matchsize = sizeof(int), |
| .hooks = (1 << NF_INET_PRE_ROUTING) | (1 << NF_INET_LOCAL_IN) | |
| (1 << NF_INET_FORWARD), |
| .me = THIS_MODULE, |
| }; |
| |
| static int __init eui64_mt6_init(void) |
| { |
| return xt_register_match(&eui64_mt6_reg); |
| } |
| |
| static void __exit eui64_mt6_exit(void) |
| { |
| xt_unregister_match(&eui64_mt6_reg); |
| } |
| |
| module_init(eui64_mt6_init); |
| module_exit(eui64_mt6_exit); |