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  */
  13
  14 #ifndef _bcmtcp_h_
  15 #define _bcmtcp_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 TCP_SRC_PORT_OFFSET     0       /* TCP source port offset */
  26 #define TCP_DEST_PORT_OFFSET    2       /* TCP dest port offset */
  27 #define TCP_CHKSUM_OFFSET       16      /* TCP body checksum offset */
  28
  29 /* These fields are stored in network order */
  30 struct bcmtcp_hdr
  31 {
  32         uint16  src_port;       /* Source Port Address */
  33         uint16  dst_port;       /* Destination Port Address */
  34         uint32  seq_num;        /* TCP Sequence Number */
  35         uint32  ack_num;        /* TCP Sequence Number */
  36         uint16  hdrlen_rsvd_flags;      /* Header length, reserved bits and flags */
  37         uint16  tcpwin;         /* TCP window */
  38         uint16  chksum;         /* Segment checksum with pseudoheader */
  39         uint16  urg_ptr;        /* Points to seq-num of byte following urg data */
  40 } PACKED;
  41
  42 #undef PACKED
  43 #if !defined(__GNUC__)
  44 #pragma pack()
  45 #endif
  46
  47 /* Byte offset of flags in TCP header */
  48 #define TCP_FLAGS_OFFSET        13
  49
  50 #define TCP_FLAGS_FIN           0x01
  51 #define TCP_FLAGS_SYN           0x02
  52 #define TCP_FLAGS_RST           0x03
  53 #define TCP_FLAGS_PSH           0x04
  54 #define TCP_FLAGS_ACK           0x10
  55 #define TCP_FLAGS_URG           0x20
  56 #define TCP_FLAGS_ECN           0x40
  57 #define TCP_FLAGS_CWR           0x80
  58
  59 #define TCP_FLAGS(tcp_hdr)      (((uint8 *)(tcp_hdr))[TCP_FLAGS_OFFSET])
  60 #define TCP_IS_ACK(tcp_hdr)     (TCP_FLAGS(tcp_hdr) & TCP_FLAGS_ACK)
  61
  62 #define TCP_SRC_PORT(tcp_hdr)   (ntoh16(((struct bcmtcp_hdr*)(tcp_hdr))->src_port))
  63 #define TCP_DST_PORT(tcp_hdr)   (ntoh16(((struct bcmtcp_hdr*)(tcp_hdr))->dst_port))
  64 #define TCP_SEQ_NUM(tcp_hdr)    (ntoh32(((struct bcmtcp_hdr*)(tcp_hdr))->seq_num))
  65 #define TCP_ACK_NUM(tcp_hdr)    (ntoh32(((struct bcmtcp_hdr*)(tcp_hdr))->ack_num))
  66
  67 #endif  /* #ifndef _bcmtcp_h_ */