68 lines
2.1 KiB
C
68 lines
2.1 KiB
C
/*
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* Copyright 2007, Broadcom Corporation
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* All Rights Reserved.
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*
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* THIS SOFTWARE IS OFFERED "AS IS", AND BROADCOM GRANTS NO WARRANTIES OF ANY
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* KIND, EXPRESS OR IMPLIED, BY STATUTE, COMMUNICATION OR OTHERWISE. BROADCOM
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* SPECIFICALLY DISCLAIMS ANY IMPLIED WARRANTIES OF MERCHANTABILITY, FITNESS
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* FOR A SPECIFIC PURPOSE OR NONINFRINGEMENT CONCERNING THIS SOFTWARE.
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*
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* Fundamental constants relating to TCP Protocol
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*
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*/
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#ifndef _bcmtcp_h_
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#define _bcmtcp_h_
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/* enable structure packing */
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#if defined(__GNUC__)
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#define PACKED __attribute__((packed))
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#else
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#pragma pack(1)
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#define PACKED
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#endif
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#define TCP_SRC_PORT_OFFSET 0 /* TCP source port offset */
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#define TCP_DEST_PORT_OFFSET 2 /* TCP dest port offset */
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#define TCP_CHKSUM_OFFSET 16 /* TCP body checksum offset */
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/* These fields are stored in network order */
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struct bcmtcp_hdr
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{
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uint16 src_port; /* Source Port Address */
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uint16 dst_port; /* Destination Port Address */
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uint32 seq_num; /* TCP Sequence Number */
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uint32 ack_num; /* TCP Sequence Number */
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uint16 hdrlen_rsvd_flags; /* Header length, reserved bits and flags */
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uint16 tcpwin; /* TCP window */
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uint16 chksum; /* Segment checksum with pseudoheader */
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uint16 urg_ptr; /* Points to seq-num of byte following urg data */
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} PACKED;
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#undef PACKED
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#if !defined(__GNUC__)
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#pragma pack()
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#endif
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/* Byte offset of flags in TCP header */
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#define TCP_FLAGS_OFFSET 13
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#define TCP_FLAGS_FIN 0x01
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#define TCP_FLAGS_SYN 0x02
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#define TCP_FLAGS_RST 0x03
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#define TCP_FLAGS_PSH 0x04
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#define TCP_FLAGS_ACK 0x10
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#define TCP_FLAGS_URG 0x20
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#define TCP_FLAGS_ECN 0x40
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#define TCP_FLAGS_CWR 0x80
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#define TCP_FLAGS(tcp_hdr) (((uint8 *)(tcp_hdr))[TCP_FLAGS_OFFSET])
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#define TCP_IS_ACK(tcp_hdr) (TCP_FLAGS(tcp_hdr) & TCP_FLAGS_ACK)
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#define TCP_SRC_PORT(tcp_hdr) (ntoh16(((struct bcmtcp_hdr*)(tcp_hdr))->src_port))
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#define TCP_DST_PORT(tcp_hdr) (ntoh16(((struct bcmtcp_hdr*)(tcp_hdr))->dst_port))
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#define TCP_SEQ_NUM(tcp_hdr) (ntoh32(((struct bcmtcp_hdr*)(tcp_hdr))->seq_num))
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#define TCP_ACK_NUM(tcp_hdr) (ntoh32(((struct bcmtcp_hdr*)(tcp_hdr))->ack_num))
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#endif /* #ifndef _bcmtcp_h_ */
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