tcp.h

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//
// Copyright (C) 2005 Christian Dankbar
// Copyright (C) 2009 Thomas Reschka
//
// This program is free software; you can redistribute it and/or
// modify it under the terms of the GNU General Public License
// as published by the Free Software Foundation; either version 2
// of the License, or (at your option) any later version.
//
// This program is distributed in the hope that it will be useful,
// but WITHOUT ANY WARRANTY; without even the implied warranty of
// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
// GNU General Public License for more details.
//
// You should have received a copy of the GNU General Public License
// along with this program; if not, see <http://www.gnu.org/licenses/>.
//

#ifndef OPPSIM_NETINET_TCP_H
#define OPPSIM_NETINET_TCP_H

#include "headers/defs.h"   // for endian macros

#  define TH_FIN    0x01
#  define TH_SYN    0x02
#  define TH_RST    0x04
#  define TH_PUSH   0x08
#  define TH_ACK    0x10
#  define TH_URG    0x20
#define TH_FLAGS    0x3F

struct tcphdr
  {
    uint16_t th_sport;         /* source port */
    uint16_t th_dport;         /* destination port */
    uint32_t th_seq;           /* sequence number */
    uint32_t th_ack;           /* acknowledgement number */
#  if BYTE_ORDER == LITTLE_ENDIAN
    uint8_t th_x2:4;           /* (unused) */
    uint8_t th_offs:4;         /* data offset */
#  elif BYTE_ORDER == BIG_ENDIAN
    uint8_t th_offs:4;         /* data offset */
    uint8_t th_x2:4;           /* (unused) */
#else
# error "Please check BYTE_ORDER declaration"
#  endif
    uint8_t th_flags;
    uint16_t th_win;           /* window */
    uint16_t th_sum;           /* checksum */
    uint16_t th_urp;           /* urgent pointer */

    uint32_t th_options[0];    /* options (optional) */
    //unsigned char data[0];        XXX MSVC only allows zero-size arrays at the end of a struct
}; // TODO  __attribute__((packed));

#endif /* netinet/tcp.h */