52 lines
1.3 KiB
C
52 lines
1.3 KiB
C
/*
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* 802.1Q VLAN protocol definitions
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*
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* Copyright 2007, Broadcom Corporation
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* All Rights Reserved.
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*
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* THIS SOFTWARE IS OFFERED "AS IS", AND BROADCOM GRANTS NO WARRANTIES OF ANY
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* KIND, EXPRESS OR IMPLIED, BY STATUTE, COMMUNICATION OR OTHERWISE. BROADCOM
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* SPECIFICALLY DISCLAIMS ANY IMPLIED WARRANTIES OF MERCHANTABILITY, FITNESS
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* FOR A SPECIFIC PURPOSE OR NONINFRINGEMENT CONCERNING THIS SOFTWARE.
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*
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*/
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#ifndef _vlan_h_
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#define _vlan_h_
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/* enable structure packing */
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#if defined(__GNUC__)
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#define PACKED __attribute__((packed))
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#else
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#pragma pack(1)
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#define PACKED
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#endif
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#define VLAN_VID_MASK 0xfff /* low 12 bits are vlan id */
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#define VLAN_CFI_SHIFT 12 /* canonical format indicator bit */
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#define VLAN_PRI_SHIFT 13 /* user priority */
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#define VLAN_PRI_MASK 7 /* 3 bits of priority */
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#define VLAN_TAG_LEN 4
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#define VLAN_TAG_OFFSET (2 * ETHER_ADDR_LEN) /* offset in Ethernet II packet only */
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#define VLAN_TPID 0x8100 /* VLAN ethertype/Tag Protocol ID */
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struct ethervlan_header {
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uint8 ether_dhost[ETHER_ADDR_LEN];
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uint8 ether_shost[ETHER_ADDR_LEN];
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uint16 vlan_type; /* 0x8100 */
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uint16 vlan_tag; /* priority, cfi and vid */
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uint16 ether_type;
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};
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#define ETHERVLAN_HDR_LEN (ETHER_HDR_LEN + VLAN_TAG_LEN)
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#undef PACKED
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#if !defined(__GNUC__)
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#pragma pack()
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#endif
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#endif /* _vlan_h_ */
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