1 // SPDX-License-Identifier: GPL-2.0-only 2 /* 3 * ebt_pkttype 4 * 5 * Authors: 6 * Bart De Schuymer <bdschuym@pandora.be> 7 * 8 * April, 2003 9 * 10 */ 11 #include <linux/module.h> 12 #include <linux/netfilter/x_tables.h> 13 #include <linux/netfilter_bridge/ebtables.h> 14 #include <linux/netfilter_bridge/ebt_pkttype.h> 15 16 static bool 17 ebt_pkttype_mt(const struct sk_buff *skb, struct xt_action_param *par) 18 { 19 const struct ebt_pkttype_info *info = par->matchinfo; 20 21 return (skb->pkt_type == info->pkt_type) ^ info->invert; 22 } 23 24 static int ebt_pkttype_mt_check(const struct xt_mtchk_param *par) 25 { 26 const struct ebt_pkttype_info *info = par->matchinfo; 27 28 if (info->invert != 0 && info->invert != 1) 29 return -EINVAL; 30 /* Allow any pkt_type value */ 31 return 0; 32 } 33 34 static struct xt_match ebt_pkttype_mt_reg __read_mostly = { 35 .name = "pkttype", 36 .revision = 0, 37 .family = NFPROTO_BRIDGE, 38 .match = ebt_pkttype_mt, 39 .checkentry = ebt_pkttype_mt_check, 40 .matchsize = sizeof(struct ebt_pkttype_info), 41 .me = THIS_MODULE, 42 }; 43 44 static int __init ebt_pkttype_init(void) 45 { 46 return xt_register_match(&ebt_pkttype_mt_reg); 47 } 48 49 static void __exit ebt_pkttype_fini(void) 50 { 51 xt_unregister_match(&ebt_pkttype_mt_reg); 52 } 53 54 module_init(ebt_pkttype_init); 55 module_exit(ebt_pkttype_fini); 56 MODULE_DESCRIPTION("Ebtables: Link layer packet type match"); 57 MODULE_LICENSE("GPL"); 58