1 /* 2 * ebt_pkttype 3 * 4 * Authors: 5 * Bart De Schuymer <bdschuym@pandora.be> 6 * 7 * April, 2003 8 * 9 */ 10 #include <linux/module.h> 11 #include <linux/netfilter/x_tables.h> 12 #include <linux/netfilter_bridge/ebtables.h> 13 #include <linux/netfilter_bridge/ebt_pkttype.h> 14 15 static bool 16 ebt_pkttype_mt(const struct sk_buff *skb, struct xt_action_param *par) 17 { 18 const struct ebt_pkttype_info *info = par->matchinfo; 19 20 return (skb->pkt_type == info->pkt_type) ^ info->invert; 21 } 22 23 static int ebt_pkttype_mt_check(const struct xt_mtchk_param *par) 24 { 25 const struct ebt_pkttype_info *info = par->matchinfo; 26 27 if (info->invert != 0 && info->invert != 1) 28 return -EINVAL; 29 /* Allow any pkt_type value */ 30 return 0; 31 } 32 33 static struct xt_match ebt_pkttype_mt_reg __read_mostly = { 34 .name = "pkttype", 35 .revision = 0, 36 .family = NFPROTO_BRIDGE, 37 .match = ebt_pkttype_mt, 38 .checkentry = ebt_pkttype_mt_check, 39 .matchsize = sizeof(struct ebt_pkttype_info), 40 .me = THIS_MODULE, 41 }; 42 43 static int __init ebt_pkttype_init(void) 44 { 45 return xt_register_match(&ebt_pkttype_mt_reg); 46 } 47 48 static void __exit ebt_pkttype_fini(void) 49 { 50 xt_unregister_match(&ebt_pkttype_mt_reg); 51 } 52 53 module_init(ebt_pkttype_init); 54 module_exit(ebt_pkttype_fini); 55 MODULE_DESCRIPTION("Ebtables: Link layer packet type match"); 56 MODULE_LICENSE("GPL"); 57