/* SPDX-License-Identifier: GPL-2.0 */
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/*
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* Fundamental constants relating to TCP Protocol
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*
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* Copyright (C) 1999-2017, Broadcom Corporation
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*
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* Unless you and Broadcom execute a separate written software license
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* agreement governing use of this software, this software is licensed to you
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* under the terms of the GNU General Public License version 2 (the "GPL"),
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* available at http://www.broadcom.com/licenses/GPLv2.php, with the
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* following added to such license:
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*
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* As a special exception, the copyright holders of this software give you
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* permission to link this software with independent modules, and to copy and
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* distribute the resulting executable under terms of your choice, provided that
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* you also meet, for each linked independent module, the terms and conditions of
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* the license of that module. An independent module is a module which is not
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* derived from this software. The special exception does not apply to any
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* modifications of the software.
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*
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* Notwithstanding the above, under no circumstances may you combine this
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* software in any way with any other Broadcom software provided under a license
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* other than the GPL, without Broadcom's express prior written consent.
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*
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*
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* <<Broadcom-WL-IPTag/Open:>>
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*
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* $Id: bcmtcp.h 700076 2017-05-17 14:42:22Z $
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*/
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#ifndef _bcmtcp_h_
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#define _bcmtcp_h_
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#ifndef _TYPEDEFS_H_
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#include <typedefs.h>
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#endif
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/* This marks the start of a packed structure section. */
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#include <packed_section_start.h>
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#define TCP_SRC_PORT_OFFSET 0 /* TCP source port offset */
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#define TCP_DEST_PORT_OFFSET 2 /* TCP dest port offset */
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#define TCP_SEQ_NUM_OFFSET 4 /* TCP sequence number offset */
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#define TCP_ACK_NUM_OFFSET 8 /* TCP acknowledgement number offset */
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#define TCP_HLEN_OFFSET 12 /* HLEN and reserved bits offset */
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#define TCP_FLAGS_OFFSET 13 /* FLAGS and reserved bits offset */
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#define TCP_CHKSUM_OFFSET 16 /* TCP body checksum offset */
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#define TCP_PORT_LEN 2 /* TCP port field length */
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/* 8bit TCP flag field */
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#define TCP_FLAG_URG 0x20
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#define TCP_FLAG_ACK 0x10
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#define TCP_FLAG_PSH 0x08
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#define TCP_FLAG_RST 0x04
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#define TCP_FLAG_SYN 0x02
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#define TCP_FLAG_FIN 0x01
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#define TCP_HLEN_MASK 0xf000
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#define TCP_HLEN_SHIFT 12
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/* These fields are stored in network order */
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BWL_PRE_PACKED_STRUCT struct bcmtcp_hdr
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{
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uint16 src_port; /* Source Port Address */
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uint16 dst_port; /* Destination Port Address */
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uint32 seq_num; /* TCP Sequence Number */
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uint32 ack_num; /* TCP Sequence Number */
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uint16 hdrlen_rsvd_flags; /* Header length, reserved bits and flags */
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uint16 tcpwin; /* TCP window */
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uint16 chksum; /* Segment checksum with pseudoheader */
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uint16 urg_ptr; /* Points to seq-num of byte following urg data */
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} BWL_POST_PACKED_STRUCT;
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#define TCP_MIN_HEADER_LEN 20
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#define TCP_HDRLEN_MASK 0xf0
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#define TCP_HDRLEN_SHIFT 4
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#define TCP_HDRLEN(hdrlen) (((hdrlen) & TCP_HDRLEN_MASK) >> TCP_HDRLEN_SHIFT)
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#define TCP_FLAGS_MASK 0x1f
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#define TCP_FLAGS(hdrlen) ((hdrlen) & TCP_FLAGS_MASK)
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/* This marks the end of a packed structure section. */
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#include <packed_section_end.h>
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/* To address round up by 32bit. */
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#define IS_TCPSEQ_GE(a, b) ((a - b) < NBITVAL(31)) /* a >= b */
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#define IS_TCPSEQ_LE(a, b) ((b - a) < NBITVAL(31)) /* a =< b */
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#define IS_TCPSEQ_GT(a, b) !IS_TCPSEQ_LE(a, b) /* a > b */
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#define IS_TCPSEQ_LT(a, b) !IS_TCPSEQ_GE(a, b) /* a < b */
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#endif /* #ifndef _bcmtcp_h_ */
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