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      1 /*
      2  * CDDL HEADER START
      3  *
      4  * The contents of this file are subject to the terms of the
      5  * Common Development and Distribution License (the "License").
      6  * You may not use this file except in compliance with the License.
      7  *
      8  * You can obtain a copy of the license at usr/src/OPENSOLARIS.LICENSE
      9  * or http://www.opensolaris.org/os/licensing.
     10  * See the License for the specific language governing permissions
     11  * and limitations under the License.
     12  *
     13  * When distributing Covered Code, include this CDDL HEADER in each
     14  * file and include the License file at usr/src/OPENSOLARIS.LICENSE.
     15  * If applicable, add the following below this CDDL HEADER, with the
     16  * fields enclosed by brackets "[]" replaced with your own identifying
     17  * information: Portions Copyright [yyyy] [name of copyright owner]
     18  *
     19  * CDDL HEADER END
     20  */
     21 
     22 /*
     23  * Copyright 2006 Sun Microsystems, Inc.  All rights reserved.
     24  * Use is subject to license terms.
     25  */
     26 
     27 #ifndef _SNOOP_VLAN_H
     28 #define	_SNOOP_VLAN_H
     29 
     30 #pragma ident	"%Z%%M%	%I%	%E% SMI"
     31 
     32 #include <sys/ethernet.h>
     33 
     34 #ifdef __cplusplus
     35 extern "C" {
     36 #endif
     37 
     38 /*
     39  * The offset in bytes, in a VLAN tagged packet, from the
     40  * ethernet header ethertype (which is ETHERTYPE_VLAN) to
     41  * the encapsulated ethertype.
     42  */
     43 #define	ENCAP_ETHERTYPE_OFF (offsetof(struct ether_vlan_header, ether_type) -\
     44 	    offsetof(struct ether_vlan_header, ether_tpid))
     45 
     46 /*
     47  * The offset in bytes, from the beginning of an ethernet header,
     48  * to the VLAN ID.
     49  */
     50 #define	VLAN_ID_OFFSET (offsetof(struct ether_vlan_header, ether_tci) -\
     51 	    offsetof(struct ether_vlan_header, ether_dhost))
     52 
     53 #ifdef __cplusplus
     54 }
     55 #endif
     56 
     57 #endif /* _SNOOP_VLAN_H */
     58