96 lines
2.9 KiB
C
96 lines
2.9 KiB
C
/*
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* Copyright (c) 2014, 2018 Jonas 'Sortie' Termansen.
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*
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* Permission to use, copy, modify, and distribute this software for any
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* purpose with or without fee is hereby granted, provided that the above
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* copyright notice and this permission notice appear in all copies.
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*
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* THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES
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* WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
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* MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR
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* ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
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* WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN
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* ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF
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* OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
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*
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* netinet/tcp.h
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* Transmission Control Protocol.
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*/
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#ifndef _INCLUDE_NETINET_TCP_H
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#define _INCLUDE_NETINET_TCP_H
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#include <sys/cdefs.h>
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#if __USE_SORTIX
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#include <netinet/in.h>
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#endif
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#if __USE_SORTIX
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typedef uint32_t tcp_seq; /* TCP sequence number. */
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/* Control Bits in struct tcphdr th_flags. */
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#define TH_FIN (1 << 0) /* No more data from sender. */
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#define TH_SYN (1 << 1) /* Synchronize sequence numbers. */
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#define TH_RST (1 << 2) /* Reset the connection. */
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#define TH_PUSH (1 << 3) /* Push Function. */
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#define TH_ACK (1 << 4) /* Acknowledgment field significant. */
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#define TH_URG (1 << 5) /* Urgent Pointer field significant. */
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struct tcphdr
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{
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in_port_t th_sport; /* Source Port. */
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in_port_t th_dport; /* Destination Port. */
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tcp_seq th_seq; /* Sequence Number. */
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tcp_seq th_ack; /* Acknowledgment Number. */
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__extension__ union
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{
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__extension__ struct
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{
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#if __BYTE_ORDER == __LITTLE_ENDIAN
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uint8_t th_x2:4; /* Reserved. */
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uint8_t th_off:4; /* Data offset. */
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#elif __BYTE_ORDER == __BIG_ENDIAN
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uint8_t th_off:4; /* Data offset. */
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uint8_t th_x2:4; /* Reserved. */
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#else
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#warning "You need to add support for your endian"
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#endif
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};
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uint8_t th_offset;
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};
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uint8_t th_flags; /* Control Bits. */
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uint16_t th_win; /* Window. */
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uint16_t th_sum; /* Checksum. */
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uint16_t th_urp; /* Urgent Pointer. */
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};
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#define TCP_OFFSET_ENCODE(x) (((x) & 0xF) << 4) /* Encode th_offset. */
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#define TCP_OFFSET_DECODE(x) (((x) >> 4) & 0xF) /* Decode th_offset. */
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#define TCP_MSS 536 /* Default Maximum Segment Size. */
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#define TCPOPT_EOL 0 /* End of Option List. */
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#define TCPOPT_NOP 1 /* No-Operation. */
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#define TCPOPT_MAXSEG 2 /* Maximum Segment Size. */
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#define TCPOLEN_MAXSEG 4 /* Length of Maximum Segment Size. */
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/* Maximum header size: 16 * 4 bytes */
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#define TCP_MAXHLEN 64
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/* Maximum total length of options. */
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#define TCP_MAXOLEN (TCP_MAXHLEN - sizeof(struct tcphdr))
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#define TCP_MAXWIN 65535 /* Maximum window size. */
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#endif
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/* Options at the IPPROTO_TCP socket level. */
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#define TCP_NODELAY 1
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#if __USE_SORTIX
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#define TCP_MAXSEG 2
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#define TCP_NOPUSH 3
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#endif
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#endif
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