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VLAN packets sent over devices supporting VLAN tagging/stripping in hardware don't have a VLAN header when they are received on packet sockets. The VLAN TCI is available through the PACKET_AUXDATA cmsg, reconstruct the entire header when necessary.
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/*- | ||
* Copyright (c) 1990, 1991, 1992, 1993, 1994, 1995, 1996, 1997 | ||
* The Regents of the University of California. All rights reserved. | ||
* | ||
* Redistribution and use in source and binary forms, with or without | ||
* modification, are permitted provided that the following conditions | ||
* are met: | ||
* 1. Redistributions of source code must retain the above copyright | ||
* notice, this list of conditions and the following disclaimer. | ||
* 2. Redistributions in binary form must reproduce the above copyright | ||
* notice, this list of conditions and the following disclaimer in the | ||
* documentation and/or other materials provided with the distribution. | ||
* 3. All advertising materials mentioning features or use of this software | ||
* must display the following acknowledgement: | ||
* This product includes software developed by the University of | ||
* California, Berkeley and its contributors. | ||
* 4. Neither the name of the University nor the names of its contributors | ||
* may be used to endorse or promote products derived from this software | ||
* without specific prior written permission. | ||
* | ||
* THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND | ||
* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE | ||
* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE | ||
* ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE | ||
* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL | ||
* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS | ||
* OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) | ||
* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT | ||
* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY | ||
* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF | ||
* SUCH DAMAGE. | ||
* | ||
* @(#) $Header: /tcpdump/master/libpcap/pcap/vlan.h,v 1.1 2008-08-06 07:45:00 guy Exp $ | ||
*/ | ||
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#ifndef lib_pcap_vlan_h | ||
#define lib_pcap_vlan_h | ||
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struct vlan_tag { | ||
u_int16_t vlan_tpid; /* ETH_P_8021Q */ | ||
u_int16_t vlan_tci; /* VLAN TCI */ | ||
}; | ||
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#define VLAN_TAG_LEN 4 | ||
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#endif |