/* * Copyright (c) 2011 Jiri Svoboda * All rights reserved. * * Redistribution and use in source and binary forms, with or without * modification, are permitted provided that the following conditions * are met: * * - Redistributions of source code must retain the above copyright * notice, this list of conditions and the following disclaimer. * - Redistributions in binary form must reproduce the above copyright * notice, this list of conditions and the following disclaimer in the * documentation and/or other materials provided with the distribution. * - The name of the author may not be used to endorse or promote products * derived from this software without specific prior written permission. * * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT, * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. */ /** @addtogroup tcp * @{ */ /** @file TCP header definitions * * Based on IETF RFC 793 */ #ifndef STD_H #define STD_H #include <stdint.h> #include <inet/addr.h> #define IP_PROTO_TCP 6 /** TCP Header (fixed part) */ typedef struct { /** Source port */ uint16_t src_port; /** Destination port */ uint16_t dest_port; /** Sequence number */ uint32_t seq; /** Acknowledgement number */ uint32_t ack; /** Data Offset, Reserved, Flags */ uint16_t doff_flags; /** Window */ uint16_t window; /* Checksum */ uint16_t checksum; /** Urgent pointer */ uint16_t urg_ptr; } tcp_header_t; /** Bits in tcp_header_t.doff_flags */ enum doff_flags_bits { DF_DATA_OFFSET_h = 15, DF_DATA_OFFSET_l = 12, DF_URG = 5, DF_ACK = 4, DF_PSH = 3, DF_RST = 2, DF_SYN = 1, DF_FIN = 0 }; /** TCP over IPv4 checksum pseudo header */ typedef struct { /** Source address */ uint32_t src; /** Destination address */ uint32_t dest; /** Zero */ uint8_t zero; /** Protocol */ uint8_t protocol; /** TCP length */ uint16_t tcp_length; } tcp_phdr_t; /** TCP over IPv6 checksum pseudo header */ typedef struct { /** Source address */ addr128_t src; /** Destination address */ addr128_t dest; /** TCP length */ uint32_t tcp_length; /** Zeroes */ uint8_t zeroes[3]; /** Next header */ uint8_t next; } tcp_phdr6_t; /** Option kind */ enum opt_kind { /** End of option list */ OPT_END_LIST = 0, /** No-operation */ OPT_NOP = 1, /** Maximum segment size */ OPT_MAX_SEG_SIZE = 2 }; #endif /** @} */