release/src-rt/include/proto/vlan.h

   1 /*
   2  * 802.1Q VLAN protocol definitions
   3  *
   4  * Copyright (C) 2009, 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  * $Id: vlan.h,v 9.4.130.1 2009/10/12 23:01:02 Exp $
  13  */
  14
  15 #ifndef _vlan_h_
  16 #define _vlan_h_
  17
  18 /* enable structure packing */
  19 #if defined(__GNUC__)
  20 #define PACKED  __attribute__((packed))
  21 #else
  22 #pragma pack(1)
  23 #define PACKED
  24 #endif
  25
  26 #define VLAN_VID_MASK           0xfff   /* low 12 bits are vlan id */
  27 #define VLAN_CFI_SHIFT          12      /* canonical format indicator bit */
  28 #define VLAN_PRI_SHIFT          13      /* user priority */
  29
  30 #define VLAN_PRI_MASK           7       /* 3 bits of priority */
  31
  32 #define VLAN_TAG_LEN            4
  33 #define VLAN_TAG_OFFSET         (2 * ETHER_ADDR_LEN)    /* offset in Ethernet II packet only */
  34
  35 #define VLAN_TPID               0x8100  /* VLAN ethertype/Tag Protocol ID */
  36
  37 struct ethervlan_header {
  38         uint8   ether_dhost[ETHER_ADDR_LEN];
  39         uint8   ether_shost[ETHER_ADDR_LEN];
  40         uint16  vlan_type;              /* 0x8100 */
  41         uint16  vlan_tag;               /* priority, cfi and vid */
  42         uint16  ether_type;
  43 };
  44
  45 #define ETHERVLAN_HDR_LEN       (ETHER_HDR_LEN + VLAN_TAG_LEN)
  46
  47 #undef PACKED
  48 #if !defined(__GNUC__)
  49 #pragma pack()
  50 #endif
  51
  52 #define ETHERVLAN_MOVE_HDR(d, s) \
  53 do { \
  54         struct ethervlan_header t; \
  55         t = *(struct ethervlan_header *)(s); \
  56         *(struct ethervlan_header *)(d) = t; \
  57 } while (0)
  58
  59 #endif /* _vlan_h_ */