| 1 | /* |
| 2 | * Copyright 2007, Broadcom Corporation |
| 3 | * All Rights Reserved. |
| 4 | * |
| 5 | * THIS SOFTWARE IS OFFERED "AS IS", AND BROADCOM GRANTS NO WARRANTIES OF ANY |
| 6 | * KIND, EXPRESS OR IMPLIED, BY STATUTE, COMMUNICATION OR OTHERWISE. BROADCOM |
| 7 | * SPECIFICALLY DISCLAIMS ANY IMPLIED WARRANTIES OF MERCHANTABILITY, FITNESS |
| 8 | * FOR A SPECIFIC PURPOSE OR NONINFRINGEMENT CONCERNING THIS SOFTWARE. |
| 9 | * |
| 10 | * Fundamental constants relating to TCP Protocol |
| 11 | * |
| 12 | */ |
| 13 | |
| 14 | #ifndef _bcmtcp_h_ |
| 15 | #define _bcmtcp_h_ |
| 16 | |
| 17 | /* enable structure packing */ |
| 18 | #if defined(__GNUC__) |
| 19 | #define PACKED __attribute__((packed)) |
| 20 | #else |
| 21 | #pragma pack(1) |
| 22 | #define PACKED |
| 23 | #endif |
| 24 | |
| 25 | #define TCP_SRC_PORT_OFFSET 0 /* TCP source port offset */ |
| 26 | #define TCP_DEST_PORT_OFFSET 2 /* TCP dest port offset */ |
| 27 | #define TCP_CHKSUM_OFFSET 16 /* TCP body checksum offset */ |
| 28 | |
| 29 | /* These fields are stored in network order */ |
| 30 | struct bcmtcp_hdr |
| 31 | { |
| 32 | uint16 src_port; /* Source Port Address */ |
| 33 | uint16 dst_port; /* Destination Port Address */ |
| 34 | uint32 seq_num; /* TCP Sequence Number */ |
| 35 | uint32 ack_num; /* TCP Sequence Number */ |
| 36 | uint16 hdrlen_rsvd_flags; /* Header length, reserved bits and flags */ |
| 37 | uint16 tcpwin; /* TCP window */ |
| 38 | uint16 chksum; /* Segment checksum with pseudoheader */ |
| 39 | uint16 urg_ptr; /* Points to seq-num of byte following urg data */ |
| 40 | } PACKED; |
| 41 | |
| 42 | #undef PACKED |
| 43 | #if !defined(__GNUC__) |
| 44 | #pragma pack() |
| 45 | #endif |
| 46 | |
| 47 | /* Byte offset of flags in TCP header */ |
| 48 | #define TCP_FLAGS_OFFSET 13 |
| 49 | |
| 50 | #define TCP_FLAGS_FIN 0x01 |
| 51 | #define TCP_FLAGS_SYN 0x02 |
| 52 | #define TCP_FLAGS_RST 0x03 |
| 53 | #define TCP_FLAGS_PSH 0x04 |
| 54 | #define TCP_FLAGS_ACK 0x10 |
| 55 | #define TCP_FLAGS_URG 0x20 |
| 56 | #define TCP_FLAGS_ECN 0x40 |
| 57 | #define TCP_FLAGS_CWR 0x80 |
| 58 | |
| 59 | #define TCP_FLAGS(tcp_hdr) (((uint8 *)(tcp_hdr))[TCP_FLAGS_OFFSET]) |
| 60 | #define TCP_IS_ACK(tcp_hdr) (TCP_FLAGS(tcp_hdr) & TCP_FLAGS_ACK) |
| 61 | |
| 62 | #define TCP_SRC_PORT(tcp_hdr) (ntoh16(((struct bcmtcp_hdr*)(tcp_hdr))->src_port)) |
| 63 | #define TCP_DST_PORT(tcp_hdr) (ntoh16(((struct bcmtcp_hdr*)(tcp_hdr))->dst_port)) |
| 64 | #define TCP_SEQ_NUM(tcp_hdr) (ntoh32(((struct bcmtcp_hdr*)(tcp_hdr))->seq_num)) |
| 65 | #define TCP_ACK_NUM(tcp_hdr) (ntoh32(((struct bcmtcp_hdr*)(tcp_hdr))->ack_num)) |
| 66 | |
| 67 | #endif /* #ifndef _bcmtcp_h_ */ |
| 68 | |
