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- /*
- * Fundamental constants relating to TCP Protocol
- *
- * Portions of this code are copyright (c) 2020 Cypress Semiconductor Corporation
- *
- * Copyright (C) 1999-2020, Broadcom Corporation
- *
- * Unless you and Broadcom execute a separate written software license
- * agreement governing use of this software, this software is licensed to you
- * under the terms of the GNU General Public License version 2 (the "GPL"),
- * available at http://www.broadcom.com/licenses/GPLv2.php, with the
- * following added to such license:
- *
- * As a special exception, the copyright holders of this software give you
- * permission to link this software with independent modules, and to copy and
- * distribute the resulting executable under terms of your choice, provided that
- * you also meet, for each linked independent module, the terms and conditions of
- * the license of that module. An independent module is a module which is not
- * derived from this software. The special exception does not apply to any
- * modifications of the software.
- *
- * Notwithstanding the above, under no circumstances may you combine this
- * software in any way with any other Broadcom software provided under a license
- * other than the GPL, without Broadcom's express prior written consent.
- *
- *
- * <<Broadcom-WL-IPTag/Open:>>
- *
- * $Id: bcmtcp.h 681862 2018-01-03 12:34:14Z $
- */
- #ifndef _bcmtcp_h_
- #define _bcmtcp_h_
- #ifndef _TYPEDEFS_H_
- #include <typedefs.h>
- #endif // 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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