| 1 | /* |
| 2 | * 802.1Q VLAN protocol definitions |
| 3 | * |
| 4 | * Copyright 2007, Broadcom Corporation |
| 5 | * All Rights Reserved. |
| 6 | * |
| 7 | * THIS SOFTWARE IS OFFERED "AS IS", AND BROADCOM GRANTS NO WARRANTIES OF ANY |
| 8 | * KIND, EXPRESS OR IMPLIED, BY STATUTE, COMMUNICATION OR OTHERWISE. BROADCOM |
| 9 | * SPECIFICALLY DISCLAIMS ANY IMPLIED WARRANTIES OF MERCHANTABILITY, FITNESS |
| 10 | * FOR A SPECIFIC PURPOSE OR NONINFRINGEMENT CONCERNING THIS SOFTWARE. |
| 11 | * |
| 12 | */ |
| 13 | |
| 14 | #ifndef _vlan_h_ |
| 15 | #define _vlan_h_ |
| 16 | |
| 17 | /* enable structure packing */ |
| 18 | #if defined(__GNUC__) |
| 19 | #define PACKED __attribute__((packed)) |
| 20 | #else |
| 21 | #pragma pack(1) |
| 22 | #define PACKED |
| 23 | #endif |
| 24 | |
| 25 | #define VLAN_VID_MASK 0xfff /* low 12 bits are vlan id */ |
| 26 | #define VLAN_CFI_SHIFT 12 /* canonical format indicator bit */ |
| 27 | #define VLAN_PRI_SHIFT 13 /* user priority */ |
| 28 | |
| 29 | #define VLAN_PRI_MASK 7 /* 3 bits of priority */ |
| 30 | |
| 31 | #define VLAN_TAG_LEN 4 |
| 32 | #define VLAN_TAG_OFFSET (2 * ETHER_ADDR_LEN) /* offset in Ethernet II packet only */ |
| 33 | |
| 34 | #define VLAN_TPID 0x8100 /* VLAN ethertype/Tag Protocol ID */ |
| 35 | |
| 36 | struct ethervlan_header { |
| 37 | uint8 ether_dhost[ETHER_ADDR_LEN]; |
| 38 | uint8 ether_shost[ETHER_ADDR_LEN]; |
| 39 | uint16 vlan_type; /* 0x8100 */ |
| 40 | uint16 vlan_tag; /* priority, cfi and vid */ |
| 41 | uint16 ether_type; |
| 42 | }; |
| 43 | |
| 44 | #define ETHERVLAN_HDR_LEN (ETHER_HDR_LEN + VLAN_TAG_LEN) |
| 45 | |
| 46 | #undef PACKED |
| 47 | #if !defined(__GNUC__) |
| 48 | #pragma pack() |
| 49 | #endif |
| 50 | |
| 51 | #endif /* _vlan_h_ */ |
| 52 | |
