1 /* 2 * Fundamental constants relating to TCP Protocol 3 * 4 * Portions of this code are copyright (c) 2021 Cypress Semiconductor Corporation 5 * 6 * Copyright (C) 1999-2017, Broadcom Corporation 7 * 8 * Unless you and Broadcom execute a separate written software license 9 * agreement governing use of this software, this software is licensed to you 10 * under the terms of the GNU General Public License version 2 (the "GPL"), 11 * available at http://www.broadcom.com/licenses/GPLv2.php, with the 12 * following added to such license: 13 * 14 * As a special exception, the copyright holders of this software give you 15 * permission to link this software with independent modules, and to copy and 16 * distribute the resulting executable under terms of your choice, provided that 17 * you also meet, for each linked independent module, the terms and conditions of 18 * the license of that module. An independent module is a module which is not 19 * derived from this software. The special exception does not apply to any 20 * modifications of the software. 21 * 22 * Notwithstanding the above, under no circumstances may you combine this 23 * software in any way with any other Broadcom software provided under a license 24 * other than the GPL, without Broadcom's express prior written consent. 25 * 26 * 27 * <<Broadcom-WL-IPTag/Open:>> 28 * 29 * $Id$ 30 */ 31 32 #ifndef _bcmtcp_h_ 33 #define _bcmtcp_h_ 34 35 #ifndef _TYPEDEFS_H_ 36 #include <typedefs.h> 37 #endif // endif 38 39 /* This marks the start of a packed structure section. */ 40 #include <packed_section_start.h> 41 42 #define TCP_SRC_PORT_OFFSET 0 /* TCP source port offset */ 43 #define TCP_DEST_PORT_OFFSET 2 /* TCP dest port offset */ 44 #define TCP_SEQ_NUM_OFFSET 4 /* TCP sequence number offset */ 45 #define TCP_ACK_NUM_OFFSET 8 /* TCP acknowledgement number offset */ 46 #define TCP_HLEN_OFFSET 12 /* HLEN and reserved bits offset */ 47 #define TCP_FLAGS_OFFSET 13 /* FLAGS and reserved bits offset */ 48 #define TCP_CHKSUM_OFFSET 16 /* TCP body checksum offset */ 49 50 #define TCP_PORT_LEN 2 /* TCP port field length */ 51 52 /* 8bit TCP flag field */ 53 #define TCP_FLAG_URG 0x20 54 #define TCP_FLAG_ACK 0x10 55 #define TCP_FLAG_PSH 0x08 56 #define TCP_FLAG_RST 0x04 57 #define TCP_FLAG_SYN 0x02 58 #define TCP_FLAG_FIN 0x01 59 60 #define TCP_HLEN_MASK 0xf000 61 #define TCP_HLEN_SHIFT 12 62 63 /* These fields are stored in network order */ 64 BWL_PRE_PACKED_STRUCT struct bcmtcp_hdr 65 { 66 uint16 src_port; /* Source Port Address */ 67 uint16 dst_port; /* Destination Port Address */ 68 uint32 seq_num; /* TCP Sequence Number */ 69 uint32 ack_num; /* TCP Sequence Number */ 70 uint16 hdrlen_rsvd_flags; /* Header length, reserved bits and flags */ 71 uint16 tcpwin; /* TCP window */ 72 uint16 chksum; /* Segment checksum with pseudoheader */ 73 uint16 urg_ptr; /* Points to seq-num of byte following urg data */ 74 } BWL_POST_PACKED_STRUCT; 75 76 #define TCP_MIN_HEADER_LEN 20 77 78 #define TCP_HDRLEN_MASK 0xf0 79 #define TCP_HDRLEN_SHIFT 4 80 #define TCP_HDRLEN(hdrlen) (((hdrlen) & TCP_HDRLEN_MASK) >> TCP_HDRLEN_SHIFT) 81 82 #define TCP_FLAGS_MASK 0x1f 83 #define TCP_FLAGS(hdrlen) ((hdrlen) & TCP_FLAGS_MASK) 84 85 /* This marks the end of a packed structure section. */ 86 #include <packed_section_end.h> 87 88 /* To address round up by 32bit. */ 89 #define IS_TCPSEQ_GE(a, b) ((a - b) < NBITVAL(31)) /* a >= b */ 90 #define IS_TCPSEQ_LE(a, b) ((b - a) < NBITVAL(31)) /* a =< b */ 91 #define IS_TCPSEQ_GT(a, b) !IS_TCPSEQ_LE(a, b) /* a > b */ 92 #define IS_TCPSEQ_LT(a, b) !IS_TCPSEQ_GE(a, b) /* a < b */ 93 94 #endif /* #ifndef _bcmtcp_h_ */ 95