1 /* (C) 1999-2001 Michal Ludvig <michal@logix.cz> 2 * 3 * This program is free software; you can redistribute it and/or modify 4 * it under the terms of the GNU General Public License version 2 as 5 * published by the Free Software Foundation. 6 */ 7 8 #include <linux/module.h> 9 #include <linux/skbuff.h> 10 #include <linux/if_ether.h> 11 #include <linux/if_packet.h> 12 13 #include <linux/netfilter/xt_pkttype.h> 14 #include <linux/netfilter/x_tables.h> 15 16 MODULE_LICENSE("GPL"); 17 MODULE_AUTHOR("Michal Ludvig <michal@logix.cz>"); 18 MODULE_DESCRIPTION("IP tables match to match on linklayer packet type"); 19 MODULE_ALIAS("ipt_pkttype"); 20 MODULE_ALIAS("ip6t_pkttype"); 21 22 static int match(const struct sk_buff *skb, 23 const struct net_device *in, 24 const struct net_device *out, 25 const void *matchinfo, 26 int offset, 27 unsigned int protoff, 28 int *hotdrop) 29 { 30 const struct xt_pkttype_info *info = matchinfo; 31 32 return (skb->pkt_type == info->pkttype) ^ info->invert; 33 } 34 35 static struct xt_match pkttype_match = { 36 .name = "pkttype", 37 .match = match, 38 .matchsize = sizeof(struct xt_pkttype_info), 39 .me = THIS_MODULE, 40 }; 41 42 static struct xt_match pkttype6_match = { 43 .name = "pkttype", 44 .match = match, 45 .matchsize = sizeof(struct xt_pkttype_info), 46 .me = THIS_MODULE, 47 }; 48 49 static int __init init(void) 50 { 51 int ret; 52 ret = xt_register_match(AF_INET, &pkttype_match); 53 if (ret) 54 return ret; 55 56 ret = xt_register_match(AF_INET6, &pkttype6_match); 57 if (ret) 58 xt_unregister_match(AF_INET, &pkttype_match); 59 60 return ret; 61 } 62 63 static void __exit fini(void) 64 { 65 xt_unregister_match(AF_INET, &pkttype_match); 66 xt_unregister_match(AF_INET6, &pkttype6_match); 67 } 68 69 module_init(init); 70 module_exit(fini); 71