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

   1 /*
   2  * Fundamental constants relating to TCP Protocol
   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: bcmtcp.h,v 1.2.28.1 2009/10/12 23:01:02 Exp $
  13  */
  14
  15 #ifndef _bcmtcp_h_
  16 #define _bcmtcp_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 TCP_SRC_PORT_OFFSET     0       /* TCP source port offset */
  27 #define TCP_DEST_PORT_OFFSET    2       /* TCP dest port offset */
  28 #define TCP_CHKSUM_OFFSET       16      /* TCP body checksum offset */
  29
  30 #define TCP_FLAG_RST            0x0004
  31 #define TCP_FLAG_SYN            0x0002
  32 #define TCP_FLAG_FIN            0x0001
  33
  34 /* These fields are stored in network order */
  35 struct bcmtcp_hdr
  36 {
  37         uint16  src_port;       /* Source Port Address */
  38         uint16  dst_port;       /* Destination Port Address */
  39         uint32  seq_num;        /* TCP Sequence Number */
  40         uint32  ack_num;        /* TCP Sequence Number */
  41         uint16  hdrlen_rsvd_flags;      /* Header length, reserved bits and flags */
  42         uint16  tcpwin;         /* TCP window */
  43         uint16  chksum;         /* Segment checksum with pseudoheader */
  44         uint16  urg_ptr;        /* Points to seq-num of byte following urg data */
  45 } PACKED;
  46
  47 #undef PACKED
  48 #if !defined(__GNUC__)
  49 #pragma pack()
  50 #endif
  51
  52 #endif  /* #ifndef _bcmtcp_h_ */