1*4882a593Smuzhiyun /* 2*4882a593Smuzhiyun * Fundamental constants relating to TCP Protocol 3*4882a593Smuzhiyun * 4*4882a593Smuzhiyun * Portions of this code are copyright (c) 2021 Cypress Semiconductor Corporation 5*4882a593Smuzhiyun * 6*4882a593Smuzhiyun * Copyright (C) 1999-2017, Broadcom Corporation 7*4882a593Smuzhiyun * 8*4882a593Smuzhiyun * Unless you and Broadcom execute a separate written software license 9*4882a593Smuzhiyun * agreement governing use of this software, this software is licensed to you 10*4882a593Smuzhiyun * under the terms of the GNU General Public License version 2 (the "GPL"), 11*4882a593Smuzhiyun * available at http://www.broadcom.com/licenses/GPLv2.php, with the 12*4882a593Smuzhiyun * following added to such license: 13*4882a593Smuzhiyun * 14*4882a593Smuzhiyun * As a special exception, the copyright holders of this software give you 15*4882a593Smuzhiyun * permission to link this software with independent modules, and to copy and 16*4882a593Smuzhiyun * distribute the resulting executable under terms of your choice, provided that 17*4882a593Smuzhiyun * you also meet, for each linked independent module, the terms and conditions of 18*4882a593Smuzhiyun * the license of that module. An independent module is a module which is not 19*4882a593Smuzhiyun * derived from this software. The special exception does not apply to any 20*4882a593Smuzhiyun * modifications of the software. 21*4882a593Smuzhiyun * 22*4882a593Smuzhiyun * Notwithstanding the above, under no circumstances may you combine this 23*4882a593Smuzhiyun * software in any way with any other Broadcom software provided under a license 24*4882a593Smuzhiyun * other than the GPL, without Broadcom's express prior written consent. 25*4882a593Smuzhiyun * 26*4882a593Smuzhiyun * 27*4882a593Smuzhiyun * <<Broadcom-WL-IPTag/Open:>> 28*4882a593Smuzhiyun * 29*4882a593Smuzhiyun * $Id$ 30*4882a593Smuzhiyun */ 31*4882a593Smuzhiyun 32*4882a593Smuzhiyun #ifndef _bcmtcp_h_ 33*4882a593Smuzhiyun #define _bcmtcp_h_ 34*4882a593Smuzhiyun 35*4882a593Smuzhiyun #ifndef _TYPEDEFS_H_ 36*4882a593Smuzhiyun #include <typedefs.h> 37*4882a593Smuzhiyun #endif // endif 38*4882a593Smuzhiyun 39*4882a593Smuzhiyun /* This marks the start of a packed structure section. */ 40*4882a593Smuzhiyun #include <packed_section_start.h> 41*4882a593Smuzhiyun 42*4882a593Smuzhiyun #define TCP_SRC_PORT_OFFSET 0 /* TCP source port offset */ 43*4882a593Smuzhiyun #define TCP_DEST_PORT_OFFSET 2 /* TCP dest port offset */ 44*4882a593Smuzhiyun #define TCP_SEQ_NUM_OFFSET 4 /* TCP sequence number offset */ 45*4882a593Smuzhiyun #define TCP_ACK_NUM_OFFSET 8 /* TCP acknowledgement number offset */ 46*4882a593Smuzhiyun #define TCP_HLEN_OFFSET 12 /* HLEN and reserved bits offset */ 47*4882a593Smuzhiyun #define TCP_FLAGS_OFFSET 13 /* FLAGS and reserved bits offset */ 48*4882a593Smuzhiyun #define TCP_CHKSUM_OFFSET 16 /* TCP body checksum offset */ 49*4882a593Smuzhiyun 50*4882a593Smuzhiyun #define TCP_PORT_LEN 2 /* TCP port field length */ 51*4882a593Smuzhiyun 52*4882a593Smuzhiyun /* 8bit TCP flag field */ 53*4882a593Smuzhiyun #define TCP_FLAG_URG 0x20 54*4882a593Smuzhiyun #define TCP_FLAG_ACK 0x10 55*4882a593Smuzhiyun #define TCP_FLAG_PSH 0x08 56*4882a593Smuzhiyun #define TCP_FLAG_RST 0x04 57*4882a593Smuzhiyun #define TCP_FLAG_SYN 0x02 58*4882a593Smuzhiyun #define TCP_FLAG_FIN 0x01 59*4882a593Smuzhiyun 60*4882a593Smuzhiyun #define TCP_HLEN_MASK 0xf000 61*4882a593Smuzhiyun #define TCP_HLEN_SHIFT 12 62*4882a593Smuzhiyun 63*4882a593Smuzhiyun /* These fields are stored in network order */ 64*4882a593Smuzhiyun BWL_PRE_PACKED_STRUCT struct bcmtcp_hdr 65*4882a593Smuzhiyun { 66*4882a593Smuzhiyun uint16 src_port; /* Source Port Address */ 67*4882a593Smuzhiyun uint16 dst_port; /* Destination Port Address */ 68*4882a593Smuzhiyun uint32 seq_num; /* TCP Sequence Number */ 69*4882a593Smuzhiyun uint32 ack_num; /* TCP Sequence Number */ 70*4882a593Smuzhiyun uint16 hdrlen_rsvd_flags; /* Header length, reserved bits and flags */ 71*4882a593Smuzhiyun uint16 tcpwin; /* TCP window */ 72*4882a593Smuzhiyun uint16 chksum; /* Segment checksum with pseudoheader */ 73*4882a593Smuzhiyun uint16 urg_ptr; /* Points to seq-num of byte following urg data */ 74*4882a593Smuzhiyun } BWL_POST_PACKED_STRUCT; 75*4882a593Smuzhiyun 76*4882a593Smuzhiyun #define TCP_MIN_HEADER_LEN 20 77*4882a593Smuzhiyun 78*4882a593Smuzhiyun #define TCP_HDRLEN_MASK 0xf0 79*4882a593Smuzhiyun #define TCP_HDRLEN_SHIFT 4 80*4882a593Smuzhiyun #define TCP_HDRLEN(hdrlen) (((hdrlen) & TCP_HDRLEN_MASK) >> TCP_HDRLEN_SHIFT) 81*4882a593Smuzhiyun 82*4882a593Smuzhiyun #define TCP_FLAGS_MASK 0x1f 83*4882a593Smuzhiyun #define TCP_FLAGS(hdrlen) ((hdrlen) & TCP_FLAGS_MASK) 84*4882a593Smuzhiyun 85*4882a593Smuzhiyun /* This marks the end of a packed structure section. */ 86*4882a593Smuzhiyun #include <packed_section_end.h> 87*4882a593Smuzhiyun 88*4882a593Smuzhiyun /* To address round up by 32bit. */ 89*4882a593Smuzhiyun #define IS_TCPSEQ_GE(a, b) ((a - b) < NBITVAL(31)) /* a >= b */ 90*4882a593Smuzhiyun #define IS_TCPSEQ_LE(a, b) ((b - a) < NBITVAL(31)) /* a =< b */ 91*4882a593Smuzhiyun #define IS_TCPSEQ_GT(a, b) !IS_TCPSEQ_LE(a, b) /* a > b */ 92*4882a593Smuzhiyun #define IS_TCPSEQ_LT(a, b) !IS_TCPSEQ_GE(a, b) /* a < b */ 93*4882a593Smuzhiyun 94*4882a593Smuzhiyun #endif /* #ifndef _bcmtcp_h_ */ 95