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/*
* Fundamental constants relating to TCP Protocol
*
* $Copyright Open Broadcom Corporation$
*
* $Id: bcmtcp.h 458522 2014-02-27 02:26:15Z $
*/
#ifndef _bcmtcp_h_
#define _bcmtcp_h_
#ifndef _TYPEDEFS_H_
#include <typedefs.h>
#endif
/* This marks the start of a packed structure section. */
#include <packed_section_start.h>
#define TCP_SRC_PORT_OFFSET 0 /* TCP source port offset */
#define TCP_DEST_PORT_OFFSET 2 /* TCP dest port offset */
#define TCP_SEQ_NUM_OFFSET 4 /* TCP sequence number offset */
#define TCP_ACK_NUM_OFFSET 8 /* TCP acknowledgement number offset */
#define TCP_HLEN_OFFSET 12 /* HLEN and reserved bits offset */
#define TCP_FLAGS_OFFSET 13 /* FLAGS and reserved bits offset */
#define TCP_CHKSUM_OFFSET 16 /* TCP body checksum offset */
#define TCP_PORT_LEN 2 /* TCP port field length */
/* 8bit TCP flag field */
#define TCP_FLAG_URG 0x20
#define TCP_FLAG_ACK 0x10
#define TCP_FLAG_PSH 0x08
#define TCP_FLAG_RST 0x04
#define TCP_FLAG_SYN 0x02
#define TCP_FLAG_FIN 0x01
#define TCP_HLEN_MASK 0xf000
#define TCP_HLEN_SHIFT 12
/* These fields are stored in network order */
BWL_PRE_PACKED_STRUCT 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 */
} BWL_POST_PACKED_STRUCT;
#define TCP_MIN_HEADER_LEN 20
#define TCP_HDRLEN_MASK 0xf0
#define TCP_HDRLEN_SHIFT 4
#define TCP_HDRLEN(hdrlen) (((hdrlen) & TCP_HDRLEN_MASK) >> TCP_HDRLEN_SHIFT)
#define TCP_FLAGS_MASK 0x1f
#define TCP_FLAGS(hdrlen) ((hdrlen) & TCP_FLAGS_MASK)
/* This marks the end of a packed structure section. */
#include <packed_section_end.h>
/* To address round up by 32bit. */
#define IS_TCPSEQ_GE(a, b) ((a - b) < NBITVAL(31)) /* a >= b */
#define IS_TCPSEQ_LE(a, b) ((b - a) < NBITVAL(31)) /* a =< b */
#define IS_TCPSEQ_GT(a, b) !IS_TCPSEQ_LE(a, b) /* a > b */
#define IS_TCPSEQ_LT(a, b) !IS_TCPSEQ_GE(a, b) /* a < b */
#endif /* #ifndef _bcmtcp_h_ */
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