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/*
* Copyright 2007, Broadcom Corporation
* All Rights Reserved.
*
* THIS SOFTWARE IS OFFERED "AS IS", AND BROADCOM GRANTS NO WARRANTIES OF ANY
* KIND, EXPRESS OR IMPLIED, BY STATUTE, COMMUNICATION OR OTHERWISE. BROADCOM
* SPECIFICALLY DISCLAIMS ANY IMPLIED WARRANTIES OF MERCHANTABILITY, FITNESS
* FOR A SPECIFIC PURPOSE OR NONINFRINGEMENT CONCERNING THIS SOFTWARE.
*
* Fundamental constants relating to TCP Protocol
*
* $Id$
*/
#ifndef _bcmtcp_h_
#define _bcmtcp_h_
/* enable structure packing */
#if defined(__GNUC__)
#define PACKED __attribute__((packed))
#else
#pragma pack(1)
#define PACKED
#endif
#define TCP_SRC_PORT_OFFSET 0 /* TCP source port offset */
#define TCP_DEST_PORT_OFFSET 2 /* TCP dest port offset */
#define TCP_CHKSUM_OFFSET 16 /* TCP body checksum offset */
/* These fields are stored in network order */
struct bcmtcp_hdr
{
uint16 src_port; /* Source Port Address */
uint16 dst_port; /* Destination Port Address */
uint32 seq_num; /* TCP Sequence Number */
uint32 ack_num; /* TCP Sequence Number */
uint16 hdrlen_rsvd_flags; /* Header length, reserved bits and flags */
uint16 tcpwin; /* TCP window */
uint16 chksum; /* Segment checksum with pseudoheader */
uint16 urg_ptr; /* Points to seq-num of byte following urg data */
} PACKED;
#undef PACKED
#if !defined(__GNUC__)
#pragma pack()
#endif
/* Byte offset of flags in TCP header */
#define TCP_FLAGS_OFFSET 13
#define TCP_FLAGS_FIN 0x01
#define TCP_FLAGS_SYN 0x02
#define TCP_FLAGS_RST 0x03
#define TCP_FLAGS_PSH 0x04
#define TCP_FLAGS_ACK 0x10
#define TCP_FLAGS_URG 0x20
#define TCP_FLAGS_ECN 0x40
#define TCP_FLAGS_CWR 0x80
#define TCP_FLAGS(tcp_hdr) (((uint8 *)(tcp_hdr))[TCP_FLAGS_OFFSET])
#define TCP_IS_ACK(tcp_hdr) (TCP_FLAGS(tcp_hdr) & TCP_FLAGS_ACK)
#define TCP_SRC_PORT(tcp_hdr) (ntoh16(((struct bcmtcp_hdr*)(tcp_hdr))->src_port))
#define TCP_DST_PORT(tcp_hdr) (ntoh16(((struct bcmtcp_hdr*)(tcp_hdr))->dst_port))
#define TCP_SEQ_NUM(tcp_hdr) (ntoh32(((struct bcmtcp_hdr*)(tcp_hdr))->seq_num))
#define TCP_ACK_NUM(tcp_hdr) (ntoh32(((struct bcmtcp_hdr*)(tcp_hdr))->ack_num))
#endif /* #ifndef _bcmtcp_h_ */
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