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| 4727 | mejdrech | 1 | /* |
| 2 | * Copyright (c) 2009 Lukas Mejdrech |
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| 3 | * All rights reserved. |
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| 4 | * |
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| 5 | * Redistribution and use in source and binary forms, with or without |
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| 6 | * modification, are permitted provided that the following conditions |
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| 7 | * are met: |
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| 8 | * |
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| 9 | * - Redistributions of source code must retain the above copyright |
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| 10 | * notice, this list of conditions and the following disclaimer. |
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| 11 | * - Redistributions in binary form must reproduce the above copyright |
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| 12 | * notice, this list of conditions and the following disclaimer in the |
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| 13 | * documentation and/or other materials provided with the distribution. |
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| 14 | * - The name of the author may not be used to endorse or promote products |
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| 15 | * derived from this software without specific prior written permission. |
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| 16 | * |
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| 17 | * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR |
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| 18 | * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES |
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| 19 | * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. |
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| 20 | * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT, |
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| 21 | * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT |
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| 22 | * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, |
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| 23 | * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY |
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| 24 | * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT |
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| 25 | * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF |
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| 26 | * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. |
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| 27 | */ |
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| 28 | |||
| 29 | /** @addtogroup tcp |
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| 30 | * @{ |
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| 31 | */ |
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| 32 | |||
| 33 | /** @file |
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| 34 | * TCP header definition. |
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| 35 | * Names according to the linux src/include/linux/tcp.h header file. |
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| 36 | */ |
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| 37 | |||
| 38 | #ifndef __NET_TCP_HEADER_H__ |
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| 39 | #define __NET_TCP_HEADER_H__ |
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| 40 | |||
| 41 | #include <sys/types.h> |
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| 42 | |||
| 43 | /** Type definition of the transmission datagram header. |
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| 44 | * @see tcp_header |
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| 45 | */ |
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| 46 | typedef struct tcp_header tcp_header_t; |
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| 47 | |||
| 48 | /** Type definition of the transmission datagram header pointer. |
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| 49 | * @see tcp_header |
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| 50 | */ |
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| 51 | typedef tcp_header_t * tcp_header_ref; |
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| 52 | |||
| 53 | /** Transmission datagram header. |
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| 54 | */ |
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| 55 | struct tcp_header{ |
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| 56 | /** The 16-bit source port number, used by the receiver to reply. |
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| 57 | */ |
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| 58 | uint16_t source; |
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| 59 | /** The 16-bit destination port number. |
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| 60 | */ |
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| 61 | uint16_t dest; |
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| 62 | /** The sequence number of the first data byte in this segment. |
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| 63 | * If the SYN control bit is set, the sequence number is the initial sequence number (n) and the first data byte is n+1. |
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| 64 | */ |
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| 65 | uint32_t seq; |
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| 66 | /** If the ACK control bit is set, this field contains the value of the next sequence number that the receiver is expecting to receive. |
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| 67 | */ |
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| 68 | uint32_t ack_seq; |
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| 69 | #ifdef ARCH_IS_BIG_ENDIAN |
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| 70 | /** The number of 32-bit words in the TCP header. |
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| 71 | * It indicates where the data begins. |
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| 72 | */ |
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| 73 | uint8_t doff:4; |
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| 74 | /** Four bits reserved for future use. |
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| 75 | * Must be zero. |
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| 76 | */ |
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| 77 | uint8_t res1:4; |
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| 78 | #else |
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| 79 | /** Four bits reserved for future use. |
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| 80 | * Must be zero. |
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| 81 | */ |
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| 82 | uint8_t res1:4; |
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| 83 | /** The number of 32-bit words in the TCP header. |
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| 84 | * It indicates where the data begins. |
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| 85 | */ |
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| 86 | uint8_t doff:4; |
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| 87 | #endif |
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| 88 | #ifdef ARCH_IS_BIG_ENDIAN |
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| 89 | /** Two bits reserved for future use. |
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| 90 | * Must be zero. |
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| 91 | */ |
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| 92 | uint8_t res2:2; |
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| 93 | /** Indicates that the urgent pointer field is significant in this segment. |
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| 94 | */ |
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| 95 | uint8_t urg:1; |
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| 96 | /** Indicates that the acknowledgment field is significant in this segment. |
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| 97 | */ |
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| 98 | uint8_t ack:1; |
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| 99 | /** Push function. |
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| 100 | */ |
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| 101 | uint8_t psh:1; |
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| 102 | /** Resets the connection. |
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| 103 | */ |
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| 104 | uint8_t rst:1; |
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| 105 | /** Synchronizes the sequence numbers. |
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| 106 | */ |
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| 107 | uint8_t syn:1; |
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| 108 | /** No more data from sender. |
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| 109 | */ |
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| 110 | uint8_t fin:1; |
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| 111 | #else |
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| 112 | /** No more data from sender. |
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| 113 | */ |
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| 114 | uint8_t fin:1; |
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| 115 | /** Synchronizes the sequence numbers. |
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| 116 | */ |
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| 117 | uint8_t syn:1; |
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| 118 | /** Resets the connection. |
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| 119 | */ |
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| 120 | uint8_t rst:1; |
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| 121 | /** Push function. |
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| 122 | */ |
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| 123 | uint8_t psh:1; |
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| 124 | /** Indicates that the acknowledgment field is significant in this segment. |
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| 125 | */ |
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| 126 | uint8_t ack:1; |
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| 127 | /** Indicates that the urgent pointer field is significant in this segment. |
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| 128 | */ |
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| 129 | uint8_t urg:1; |
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| 130 | /** Two bits reserved for future use. |
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| 131 | * Must be zero. |
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| 132 | */ |
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| 133 | uint8_t res2:2; |
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| 134 | #endif |
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| 135 | /** Used in ACK segments. |
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| 136 | * It specifies the number of data bytes, beginning with the one indicated in the acknowledgment number field that the receiver (the sender of this segment) is willing to accept. |
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| 137 | */ |
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| 138 | uint16_t window; |
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| 139 | /** The 16-bit one's complement of the one's complement sum of all 16-bit words in a pseudo-header, the TCP header, and the TCP data. |
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| 140 | * While computing the checksum, the checksum field itself is considered zero. |
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| 141 | * The pseudo header conceptually prefixed to the TCP header contains the source address, the destination address, the protocol, and the TCP length. |
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| 142 | * This information gives protection against misrouted datagrams. |
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| 143 | * If the computed checksum is zero, it is transmitted as all ones (the equivalent in one's complement arithmetic). |
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| 144 | */ |
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| 145 | uint16_t check; |
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| 146 | /** Points to the first data octet following the urgent data. |
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| 147 | * Only significant when the URG control bit is set. |
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| 148 | */ |
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| 149 | uint16_t urg_ptr; |
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| 150 | } __attribute__ ((packed)); |
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| 151 | |||
| 152 | #endif |
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| 153 | |||
| 154 | /** @} |
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| 155 | */ |