| /* (C) 1999-2001 Michal Ludvig <michal@logix.cz> |
| * |
| * 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/if_packet.h> |
| |
| #include <linux/netfilter_ipv4/ipt_pkttype.h> |
| #include <linux/netfilter_ipv4/ip_tables.h> |
| |
| MODULE_LICENSE("GPL"); |
| MODULE_AUTHOR("Michal Ludvig <michal@logix.cz>"); |
| MODULE_DESCRIPTION("IP tables match to match on linklayer packet type"); |
| |
| static int match(const struct sk_buff *skb, |
| const struct net_device *in, |
| const struct net_device *out, |
| const void *matchinfo, |
| int offset, |
| int *hotdrop) |
| { |
| const struct ipt_pkttype_info *info = matchinfo; |
| |
| return (skb->pkt_type == info->pkttype) ^ info->invert; |
| } |
| |
| static int checkentry(const char *tablename, |
| const struct ipt_ip *ip, |
| void *matchinfo, |
| unsigned int matchsize, |
| unsigned int hook_mask) |
| { |
| /* |
| if (hook_mask |
| & ~((1 << NF_IP_PRE_ROUTING) | (1 << NF_IP_LOCAL_IN) |
| | (1 << NF_IP_FORWARD))) { |
| printk("ipt_pkttype: only valid for PRE_ROUTING, LOCAL_IN or FORWARD.\n"); |
| return 0; |
| } |
| */ |
| if (matchsize != IPT_ALIGN(sizeof(struct ipt_pkttype_info))) |
| return 0; |
| |
| return 1; |
| } |
| |
| static struct ipt_match pkttype_match = { |
| .name = "pkttype", |
| .match = &match, |
| .checkentry = &checkentry, |
| .me = THIS_MODULE, |
| }; |
| |
| static int __init init(void) |
| { |
| return ipt_register_match(&pkttype_match); |
| } |
| |
| static void __exit fini(void) |
| { |
| ipt_unregister_match(&pkttype_match); |
| } |
| |
| module_init(init); |
| module_exit(fini); |