package/broadcom-57xx/src/proto/vlan.h

   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_ */