uip.h

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/*
 * Copyright (c) 2001-2002, Adam Dunkels.
 * All rights reserved.
 *
 * Redistribution and use in source and binary forms, with or without
 * modification, are permitted provided that the following conditions
 * are met:
 * 1. Redistributions of source code must retain the above copyright
 *    notice, this list of conditions and the following disclaimer.
 * 2. 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.
 * 3. All advertising materials mentioning features or use of this software
 *    must display the following acknowledgement:
 *      This product includes software developed by Adam Dunkels.
 * 4. 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.
 *
 * This file is part of the uIP TCP/IP stack.
 *
 * $Id: uip.h,v 1.19 2002/01/15 17:54:54 adam Exp $
 *
 */

#ifndef __UIP_H__
#define __UIP_H__

#include "uipopt.h"

/* The following flags are passed as an argument to the uip_process()
   function. They are used to distinguish between the two cases where
   uip_process() is called. It can be called either because we have
   incoming data that should be processed, or because the periodic
   timer has fired. */

#define UIP_DATA    1     /* Tells uIP that there is incoming data in
                             the uip_buf buffer. The length of the
                             data is stored in the global variable
                             uip_len. */
#define UIP_TIMER   2     /* Tells uIP that the periodic timer has
                             fired. */

/* The TCP states used in the uip_conn->tcpstateflags. */
#define CLOSED      0
#define SYN_RCVD    1
#define SYN_SENT    2
#define ESTABLISHED 3
#define FIN_WAIT_1  4
#define FIN_WAIT_2  5
#define CLOSING     6
#define TIME_WAIT   7
#define LAST_ACK    8
#define TS_MASK     15

#define UIP_OUTSTANDING 16
#define UIP_STOPPED     32

/* The following flags may be set in the global variable uip_flags
   before calling the application callback. The UIP_ACKDATA and
   UIP_NEWDATA flags may both be set at the same time, whereas the
   others are mutualy exclusive. Note that these flags should *NOT* be
   accessed directly, but through the uip_has and uip_in
   functions/macros. */

#define UIP_ACKDATA   1     /* Signifies that the outstanding data was
			       acked and the application should send
			       out new data instead of retransmitting
			       the last data. */
#define UIP_NEWDATA   2     /* Flags the fact that the peer has sent
			       us new data. */
#define UIP_REXMIT    4     /* Tells the application to retransmit the
			       data that was last sent. */
#define UIP_POLL      8     /* Used for polling the application, to
			       check if the application has data that
			       it wants to send. */
#define UIP_CLOSE     16    /* The remote host has closed the
			       connection, thus the connection has
			       gone away. Or the application signals
			       that it wants to close the
			       connection. */
#define UIP_ABORT     32    /* The remote host has aborted the
			       connection, thus the connection has
			       gone away. Or the application signals
			       that it wants to abort the
			       connection. */
#define UIP_CONNECTED 64    /* We have got a connection from a remote
                               host and have set up a new connection
                               for it, or an active connection has
                               been successfully established. */

#define UIP_TIMEDOUT  128   /* The connection has been aborted due to
			       too many retransmissions. */

/* struct uip_conn:
 *
 * The uip_conn structure is used for identifying a connection. All
 * but one field in the structure are to be considered read-only by an
 * application. The only exception is the appstate field whos purpose
 * is to let the application store application-specific state (e.g.,
 * file pointers) for the connection. The size of this field is
 * configured in the "uipopt.h" header file.
 */
struct uip_conn {
  u8_t tcpstateflags; /* TCP state and flags. */
  u16_t lport, rport; /* The local and the remote port. */
  u16_t ripaddr[2];   /* The IP address of the remote peer. */
  u8_t rcv_nxt[4];    /* The sequence number that we expect to receive
			 next. */
  u8_t snd_nxt[4];    /* The sequence number that was last sent by
                         us. */
  u8_t ack_nxt[4];    /* The sequence number that should be ACKed by
			 next ACK from peer. */
#if UIP_TCP_MSS >= 256
  u16_t mss;          /* Maximum segment size for the connection. */
#else
  u8_t mss;
#endif /* UIP_TCP_MSS */
  u8_t timer;         /* The retransmission timer. */
  u8_t nrtx;          /* Counts the number of retransmissions for a
                         particular segment. */

  u8_t appstate[UIP_APPSTATE_SZ];
};

/*-----------------------------------------------------------------------------------*/
/* First, the functions that should be called from the
 * system. Initialization, the periodic timer and incoming packets are
 * handled by the following three functions.
 */

/* uip_init():
 *
 * Must be called at boot up to configure the uIP data structures.
 */
void uip_init(void);

/* uip_periodic(conn):
 *
 * Should be called when the periodic timer has fired. Should be
 * called once per connection (0 - UIP_CONNS).
 */
#define uip_periodic(conn) do { uip_conn = uip_conns[conn]; \
                                uip_process(UIP_TIMER); } while (0)

/* uip_input():
 *
 * Is called when the network device driver has received new data.
 */
#define uip_input()        uip_process(UIP_DATA)

/*-----------------------------------------------------------------------------------*/
/* Functions that are used by the uIP application program. Opening and
 * closing connections, sending and receiving data, etc. is all
 * handled by the functions below.
*/

/* uip_listen(port):
 *
 * Starts listening to the specified port.
 */
void uip_listen(u16_t port);

/* uip_connect(ripaddr, port):
 *
 * Returns a connection identifier that connects to a port on the
 * specified host (given in ripaddr). If no connections are avaliable,
 * the function returns NULL. This function is avaliable only if
 * support for active open has been configured (#define
 * UIP_ACTIVE_OPEN 1 in uipopt.h)
 */
struct uip_conn *uip_connect(u16_t *ripaddr, u16_t port);

/* uip_send(data, len):
 *
 * Send data on the current connection. The length of the data must
 * not exceed the maxium segment size (MSS) for the connection.
 */
#define uip_send(data, len) do { uip_appdata = data; uip_len = len;} while(0)

/* uip_datalen():
 *
 * The length of the data that is currently avaliable (if avaliable)
 * in the uip_appdata buffer. The test function uip_data() is
 * used to check if data is avaliable.
 */
#define uip_datalen()       uip_len

/* uip_close():
 *
 * Close the current connection.
 */
#define uip_close()         (uip_flags = UIP_CLOSE)

/* uip_abort():
 *
 * Abort the current connection.
 */
#define uip_abort()         (uip_flags = UIP_ABORT)

/* uip_stop():
 *
 * Close our receiver's window so that we stop receiving data for the
 * current connection.
 */
#define uip_stop()          (uip_conn->tcpstateflags |= UIP_STOPPED)

/* uip_stopped():
 *
 * Find out if the current connection has been previously stopped.
 */
#define uip_stopped()       (uip_conn->tcpstateflags & UIP_STOPPED)

/* uip_restart():
 *
 * Open the window again so that we start receiving data for the
 * current connection.
 */
#define uip_restart()         do { uip_flags |= UIP_NEWDATA; \
                                   uip_conn->tcpstateflags &= ~UIP_STOPPED; \
                              } while(0)


/* uIP tests that can be made to determine in what state the current
   connection is, and what the application function should do. */

/* uip_newdata():
 *
 * Will reduce to non-zero if there is new data for the application
 * present at the uip_appdata pointer. The size of the data is
 * avaliable through the uip_len variable.
 */