| /* |
| * Fundamental constants relating to TCP Protocol |
| * |
| * Copyright (C) 2017, Broadcom. All Rights Reserved. |
| * |
| * Permission to use, copy, modify, and/or distribute this software for any |
| * purpose with or without fee is hereby granted, provided that the above |
| * copyright notice and this permission notice appear in all copies. |
| * |
| * THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES |
| * WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF |
| * MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY |
| * SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES |
| * WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN ACTION |
| * OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF OR IN |
| * CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE. |
| * |
| * |
| * <<Broadcom-WL-IPTag/Open:>> |
| * |
| * $Id: bcmtcp.h 518342 2014-12-01 23:21:41Z $ |
| */ |
| |
| #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_ */ |
