uip.h

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/*
 * Copyright (c) 2001-2003, 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. 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 1.36.2.7 2003/10/07 13:47:51 adam Exp $
 *
 */

#ifndef __UIP_H__
#define __UIP_H__

#include "uipopt.h"

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

#define uip_sethostaddr(addr) do { uip_hostaddr[0] = addr[0]; \
                              uip_hostaddr[1] = addr[1]; } while(0)

#define uip_gethostaddr(addr) do { addr[0] = uip_hostaddr[0]; \
                              addr[1] = uip_hostaddr[1]; } while(0)

void uip_init(void);

#define uip_input()        uip_process(UIP_DATA)

#define uip_periodic(conn) do { uip_conn = &uip_conns[conn]; \
                                uip_process(UIP_TIMER); } while (0)

#define uip_periodic_conn(conn) do { uip_conn = conn; \
                                     uip_process(UIP_TIMER); } while (0)

#if UIP_UDP

#define uip_udp_periodic(conn) do { uip_udp_conn = &uip_udp_conns[conn]; \
                                uip_process(UIP_UDP_TIMER); } while (0)

#define uip_udp_periodic_conn(conn) do { uip_udp_conn = conn; \
                                         uip_process(UIP_UDP_TIMER); } while (0)


#endif /* UIP_UDP */

extern u8_t uip_buf[UIP_BUFSIZE+2];

/*-----------------------------------------------------------------------------------*/
/* 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.
*/
void uip_listen(u16_t port);

void uip_unlisten(u16_t port);

struct uip_conn *uip_connect(u16_t *ripaddr, u16_t port);



#define uip_outstanding(conn) ((conn)->len)

#define uip_send(data, len) do { uip_sappdata = (data); uip_slen = (len);} while(0)   

#define uip_datalen()       uip_len

#define uip_urgdatalen()    uip_urglen

#define uip_close()         (uip_flags = UIP_CLOSE)

#define uip_abort()         (uip_flags = UIP_ABORT)

#define uip_stop()          (uip_conn->tcpstateflags |= UIP_STOPPED)

#define uip_stopped(conn)   ((conn)->tcpstateflags & UIP_STOPPED)

#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. */

#define uip_newdata()   (uip_flags & UIP_NEWDATA)

#define uip_acked()   (uip_flags & UIP_ACKDATA)

#define uip_connected() (uip_flags & UIP_CONNECTED)

#define uip_closed()    (uip_flags & UIP_CLOSE)

#define uip_aborted()    (uip_flags & UIP_ABORT)

#define uip_timedout()    (uip_flags & UIP_TIMEDOUT)

#define uip_rexmit()     (uip_flags & UIP_REXMIT)

#define uip_poll()       (uip_flags & UIP_POLL)

#define uip_initialmss()             (uip_conn->initialmss)

#define uip_mss()             (uip_conn->mss)

struct uip_udp_conn *uip_udp_new(u16_t *ripaddr, u16_t rport);

#define uip_udp_remove(conn) (conn)->lport = 0

#define uip_udp_send(len) uip_slen = (len)

/* uIP convenience and converting functions. */

#define uip_ipaddr(addr, addr0,addr1,addr2,addr3) do { \
                     (addr)[0] = HTONS(((addr0) << 8) | (addr1)); \
                     (addr)[1] = HTONS(((addr2) << 8) | (addr3)); \
                  } while(0)

#ifndef HTONS
#   if BYTE_ORDER == BIG_ENDIAN
#      define HTONS(n) (n)
#   else /* BYTE_ORDER == BIG_ENDIAN */
#      define HTONS(n) ((((u16_t)((n) & 0xff)) << 8) | (((n) & 0xff00) >> 8))
#   endif /* BYTE_ORDER == BIG_ENDIAN */
#endif /* HTONS */

#ifndef htons
u16_t htons(u16_t val);
#endif /* htons */

extern volatile u8_t *uip_appdata;
extern volatile u8_t *uip_sappdata; 

#if UIP_URGDATA > 0 
/* u8_t *uip_urgdata:
 *
 * This pointer points to any urgent data that has been received. Only
 * present if compiled with support for urgent data (UIP_URGDATA).
 */
extern volatile u8_t *uip_urgdata; 
#endif /* UIP_URGDATA > 0 */


/* u[8|16]_t uip_len:
 *
 * When the application is called, uip_len contains the length of any
 * new data that has been received from the remote host. The
 * application should set this variable to the size of any data that
 * the application wishes to send. When the network device driver
 * output function is called, uip_len should contain the length of the
 * outgoing packet.
 */
extern volatile u16_t uip_len, uip_slen;

#if UIP_URGDATA > 0 
extern volatile u8_t uip_urglen, uip_surglen;
#endif /* UIP_URGDATA > 0 */


struct uip_conn {
  u16_t ripaddr[2];   
  u16_t lport;        
  u16_t rport;        
  u8_t rcv_nxt[4];    
  u8_t snd_nxt[4];    
  u16_t len;          
  u16_t mss;          
  u16_t initialmss;   
  u8_t sa;            
  u8_t sv;            
  u8_t rto;           
  u8_t tcpstateflags; 
  u8_t timer;         
  u8_t nrtx;          
  u8_t appstate[UIP_APPSTATE_SIZE];  
};


/* Pointer to the current connection. */
extern struct uip_conn *uip_conn;
/* The array containing all uIP connections. */
extern struct uip_conn uip_conns[UIP_CONNS];
extern volatile u8_t uip_acc32[4];

#if UIP_UDP

struct uip_udp_conn {
  u16_t ripaddr[2];   
  u16_t lport;        
  u16_t rport;        
};

extern struct uip_udp_conn *uip_udp_conn;
extern struct uip_udp_conn uip_udp_conns[UIP_UDP_CONNS];
#endif /* UIP_UDP */

struct uip_stats {
  struct {
    uip_stats_t drop;     
    uip_stats_t recv;     
    uip_stats_t sent;     
    uip_stats_t vhlerr;   
    uip_stats_t hblenerr; 
    uip_stats_t lblenerr; 
    uip_stats_t fragerr;  
    uip_stats_t chkerr;   
    uip_stats_t protoerr; 
  } ip;                   
  struct {
    uip_stats_t drop;     
    uip_stats_t recv;     
    uip_stats_t sent;     
    uip_stats_t typeerr;  
  } icmp;                 
  struct {
    uip_stats_t drop;     
    uip_stats_t recv;     
    uip_stats_t sent;     
    uip_stats_t chkerr;   
    uip_stats_t ackerr;   
    uip_stats_t rst;      
    uip_stats_t rexmit;   
    uip_stats_t syndrop;  
    uip_stats_t synrst;   
  } tcp;                  
};

extern struct uip_stats uip_stat;


/*-----------------------------------------------------------------------------------*/
/* All the stuff below this point is internal to uIP and should not be
 * used directly by an application or by a device driver.
 */
/*-----------------------------------------------------------------------------------*/
/* u8_t uip_flags:
 *
 * When the application is called, uip_flags will contain the flags
 * that are defined in this file. Please read below for more
 * infomation.
 */
extern volatile u8_t uip_flags;

/* 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 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. */


/* uip_process(flag):
 *
 * The actual uIP function which does all the work.
 */
void uip_process(u8_t flag);

/* 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. */
#if UIP_UDP
#define UIP_UDP_TIMER 3
#endif /* UIP_UDP */

/* 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_STOPPED      16

#define UIP_TCPIP_HLEN 40

/* The TCP and IP headers. */
typedef struct {
  /* IP header. */
  u8_t vhl,
    tos,          
    len[2],       
    ipid[2],        
    ipoffset[2],  
    ttl,          
    proto;     
  u16_t ipchksum;
  u16_t srcipaddr[2], 
    destipaddr[2];
  
  /* TCP header. */
  u16_t srcport,
    destport;
  u8_t seqno[4],  
    ackno[4],
    tcpoffset,
    flags,
    wnd[2];     
  u16_t tcpchksum;
  u8_t urgp[2];
  u8_t optdata[4];
} uip_tcpip_hdr;

/* The ICMP and IP headers. */
typedef struct {
  /* IP header. */
  u8_t vhl,
    tos,          
    len[2],       
    ipid[2],        
    ipoffset[2],  
    ttl,          
    proto;     
  u16_t ipchksum;
  u16_t srcipaddr[2], 
    destipaddr[2];
  /* ICMP (echo) header. */
  u8_t type, icode;
  u16_t icmpchksum;
  u16_t id, seqno;  
} uip_icmpip_hdr;


/* The UDP and IP headers. */
typedef struct {
  /* IP header. */
  u8_t vhl,
    tos,          
    len[2],       
    ipid[2],        
    ipoffset[2],  
    ttl,          
    proto;     
  u16_t ipchksum;
  u16_t srcipaddr[2], 
    destipaddr[2];
  
  /* UDP header. */
  u16_t srcport,
    destport;
  u16_t udplen;
  u16_t udpchksum;
} uip_udpip_hdr;

#define UIP_PROTO_ICMP  1
#define UIP_PROTO_TCP   6
#define UIP_PROTO_UDP   17

#if UIP_FIXEDADDR
extern const u16_t uip_hostaddr[2];
#else /* UIP_FIXEDADDR */
extern u16_t uip_hostaddr[2];
#endif /* UIP_FIXEDADDR */

#endif /* __UIP_H__ */

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