| /* Kernel module to match MAC address parameters. */ |
| |
| /* (C) 1999-2001 Paul `Rusty' Russell |
| * (C) 2002-2004 Netfilter Core Team <coreteam@netfilter.org> |
| * |
| * 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/if_ether.h> |
| |
| #include <linux/netfilter_ipv6/ip6t_mac.h> |
| #include <linux/netfilter_ipv6/ip6_tables.h> |
| |
| MODULE_LICENSE("GPL"); |
| MODULE_DESCRIPTION("MAC address matching module for IPv6"); |
| MODULE_AUTHOR("Netfilter Core Teaam <coreteam@netfilter.org>"); |
| |
| static int |
| match(const struct sk_buff *skb, |
| const struct net_device *in, |
| const struct net_device *out, |
| const void *matchinfo, |
| int offset, |
| unsigned int protoff, |
| int *hotdrop) |
| { |
| const struct ip6t_mac_info *info = matchinfo; |
| |
| /* Is mac pointer valid? */ |
| return (skb->mac.raw >= skb->head |
| && (skb->mac.raw + ETH_HLEN) <= skb->data |
| /* If so, compare... */ |
| && ((memcmp(eth_hdr(skb)->h_source, info->srcaddr, ETH_ALEN) |
| == 0) ^ info->invert)); |
| } |
| |
| static int |
| ip6t_mac_checkentry(const char *tablename, |
| const struct ip6t_ip6 *ip, |
| void *matchinfo, |
| unsigned int matchsize, |
| unsigned int hook_mask) |
| { |
| if (hook_mask |
| & ~((1 << NF_IP6_PRE_ROUTING) | (1 << NF_IP6_LOCAL_IN) |
| | (1 << NF_IP6_FORWARD))) { |
| printk("ip6t_mac: only valid for PRE_ROUTING, LOCAL_IN or" |
| " FORWARD\n"); |
| return 0; |
| } |
| |
| if (matchsize != IP6T_ALIGN(sizeof(struct ip6t_mac_info))) |
| return 0; |
| |
| return 1; |
| } |
| |
| static struct ip6t_match mac_match = { |
| .name = "mac", |
| .match = &match, |
| .checkentry = &ip6t_mac_checkentry, |
| .me = THIS_MODULE, |
| }; |
| |
| static int __init init(void) |
| { |
| return ip6t_register_match(&mac_match); |
| } |
| |
| static void __exit fini(void) |
| { |
| ip6t_unregister_match(&mac_match); |
| } |
| |
| module_init(init); |
| module_exit(fini); |