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

   1 /*
   2  * Copyright 2007, Broadcom Corporation
   3  * All Rights Reserved.
   4  *
   5  * THIS SOFTWARE IS OFFERED "AS IS", AND BROADCOM GRANTS NO WARRANTIES OF ANY
   6  * KIND, EXPRESS OR IMPLIED, BY STATUTE, COMMUNICATION OR OTHERWISE. BROADCOM
   7  * SPECIFICALLY DISCLAIMS ANY IMPLIED WARRANTIES OF MERCHANTABILITY, FITNESS
   8  * FOR A SPECIFIC PURPOSE OR NONINFRINGEMENT CONCERNING THIS SOFTWARE.
   9  *
  10  * Fundamental constants relating to TCP Protocol
  11  *
  12  * $Id: bcmtcp.h,v 1.1.1.1 2007/05/31 08:00:41 michael 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 /* These fields are stored in network order */
  31 struct bcmtcp_hdr
  32 {
  33         uint16  src_port;       /* Source Port Address */
  34         uint16  dst_port;       /* Destination Port Address */
  35         uint32  seq_num;        /* TCP Sequence Number */
  36         uint32  ack_num;        /* TCP Sequence Number */
  37         uint16  hdrlen_rsvd_flags;      /* Header length, reserved bits and flags */
  38         uint16  tcpwin;         /* TCP window */
  39         uint16  chksum;         /* Segment checksum with pseudoheader */
  40         uint16  urg_ptr;        /* Points to seq-num of byte following urg data */
  41 } PACKED;
  42
  43 #undef PACKED
  44 #if !defined(__GNUC__)
  45 #pragma pack()
  46 #endif
  47
  48 /* Byte offset of flags in TCP header */
  49 #define TCP_FLAGS_OFFSET        13
  50
  51 #define TCP_FLAGS_FIN           0x01
  52 #define TCP_FLAGS_SYN           0x02
  53 #define TCP_FLAGS_RST           0x03
  54 #define TCP_FLAGS_PSH           0x04
  55 #define TCP_FLAGS_ACK           0x10
  56 #define TCP_FLAGS_URG           0x20
  57 #define TCP_FLAGS_ECN           0x40
  58 #define TCP_FLAGS_CWR           0x80
  59
  60 #define TCP_FLAGS(tcp_hdr)      (((uint8 *)(tcp_hdr))[TCP_FLAGS_OFFSET])
  61 #define TCP_IS_ACK(tcp_hdr)     (TCP_FLAGS(tcp_hdr) & TCP_FLAGS_ACK)
  62
  63 #define TCP_SRC_PORT(tcp_hdr)   (ntoh16(((struct bcmtcp_hdr*)(tcp_hdr))->src_port))
  64 #define TCP_DST_PORT(tcp_hdr)   (ntoh16(((struct bcmtcp_hdr*)(tcp_hdr))->dst_port))
  65 #define TCP_SEQ_NUM(tcp_hdr)    (ntoh32(((struct bcmtcp_hdr*)(tcp_hdr))->seq_num))
  66 #define TCP_ACK_NUM(tcp_hdr)    (ntoh32(((struct bcmtcp_hdr*)(tcp_hdr))->ack_num))
  67
  68 #endif  /* #ifndef _bcmtcp_h_ */