Projects/Incomplete/Webserver/Lib/uip/uip.h

   1
   2 /**
   3  * \addtogroup uip
   4  * @{
   5  */
   6
   7 /**
   8  * \file
   9  * Header file for the uIP TCP/IP stack.
  10  * \author Adam Dunkels <adam@dunkels.com>
  11  *
  12  * The uIP TCP/IP stack header file contains definitions for a number
  13  * of C macros that are used by uIP programs as well as internal uIP
  14  * structures, TCP/IP header structures and function declarations.
  15  *
  16  */
  17
  18
  19 /*
  20  * Copyright (c) 2001-2003, Adam Dunkels.
  21  * All rights reserved.
  22  *
  23  * Redistribution and use in source and binary forms, with or without
  24  * modification, are permitted provided that the following conditions
  25  * are met:
  26  * 1. Redistributions of source code must retain the above copyright
  27  *    notice, this list of conditions and the following disclaimer.
  28  * 2. Redistributions in binary form must reproduce the above copyright
  29  *    notice, this list of conditions and the following disclaimer in the
  30  *    documentation and/or other materials provided with the distribution.
  31  * 3. The name of the author may not be used to endorse or promote
  32  *    products derived from this software without specific prior
  33  *    written permission.
  34  *
  35  * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS
  36  * OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED
  37  * WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
  38  * ARE DISCLAIMED.  IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY
  39  * DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
  40  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE
  41  * GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
  42  * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY,
  43  * WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING
  44  * NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS
  45  * SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
  46  *
  47  * This file is part of the uIP TCP/IP stack.
  48  *
  49  * $Id: uip.h,v 1.40 2006/06/08 07:12:07 adam Exp $
  50  *
  51  */
  52
  53 #ifndef __UIP_H__
  54 #define __UIP_H__
  55
  56 #include "uipopt.h"
  57
  58 /**
  59  * Repressentation of an IP address.
  60  *
  61  */
  62 typedef u16_t uip_ip4addr_t[2];
  63 typedef u16_t uip_ip6addr_t[8];
  64 #if UIP_CONF_IPV6
  65 typedef uip_ip6addr_t uip_ipaddr_t;
  66 #else /* UIP_CONF_IPV6 */
  67 typedef uip_ip4addr_t uip_ipaddr_t;
  68 #endif /* UIP_CONF_IPV6 */
  69
  70 /*---------------------------------------------------------------------------*/
  71 /* First, the functions that should be called from the
  72  * system. Initialization, the periodic timer and incoming packets are
  73  * handled by the following three functions.
  74  */
  75
  76 /**
  77  * \defgroup uipconffunc uIP configuration functions
  78  * @{
  79  *
  80  * The uIP configuration functions are used for setting run-time
  81  * parameters in uIP such as IP addresses.
  82  */
  83
  84 /**
  85  * Set the IP address of this host.
  86  *
  87  * The IP address is represented as a 4-byte array where the first
  88  * octet of the IP address is put in the first member of the 4-byte
  89  * array.
  90  *
  91  * Example:
  92  \code
  93
  94  uip_ipaddr_t addr;
  95
  96  uip_ipaddr(&addr, 192,168,1,2);
  97  uip_sethostaddr(&addr);
  98
  99  \endcode
 100  * \param addr A pointer to an IP address of type uip_ipaddr_t;
 101  *
 102  * \sa uip_ipaddr()
 103  *
 104  * \hideinitializer
 105  */
 106 #define uip_sethostaddr(addr) uip_ipaddr_copy(uip_hostaddr, (addr))
 107
 108 /**
 109  * Get the IP address of this host.
 110  *
 111  * The IP address is represented as a 4-byte array where the first
 112  * octet of the IP address is put in the first member of the 4-byte
 113  * array.
 114  *
 115  * Example:
 116  \code
 117  uip_ipaddr_t hostaddr;
 118
 119  uip_gethostaddr(&hostaddr);
 120  \endcode
 121  * \param addr A pointer to a uip_ipaddr_t variable that will be
 122  * filled in with the currently configured IP address.
 123  *
 124  * \hideinitializer
 125  */
 126 #define uip_gethostaddr(addr) uip_ipaddr_copy((addr), uip_hostaddr)
 127
 128 /**
 129  * Set the default router's IP address.
 130  *
 131  * \param addr A pointer to a uip_ipaddr_t variable containing the IP
 132  * address of the default router.
 133  *
 134  * \sa uip_ipaddr()
 135  *
 136  * \hideinitializer
 137  */
 138 #define uip_setdraddr(addr) uip_ipaddr_copy(uip_draddr, (addr))
 139
 140 /**
 141  * Set the netmask.
 142  *
 143  * \param addr A pointer to a uip_ipaddr_t variable containing the IP
 144  * address of the netmask.
 145  *
 146  * \sa uip_ipaddr()
 147  *
 148  * \hideinitializer
 149  */
 150 #define uip_setnetmask(addr) uip_ipaddr_copy(uip_netmask, (addr))
 151
 152
 153 /**
 154  * Get the default router's IP address.
 155  *
 156  * \param addr A pointer to a uip_ipaddr_t variable that will be
 157  * filled in with the IP address of the default router.
 158  *
 159  * \hideinitializer
 160  */
 161 #define uip_getdraddr(addr) uip_ipaddr_copy((addr), uip_draddr)
 162
 163 /**
 164  * Get the netmask.
 165  *
 166  * \param addr A pointer to a uip_ipaddr_t variable that will be
 167  * filled in with the value of the netmask.
 168  *
 169  * \hideinitializer
 170  */
 171 #define uip_getnetmask(addr) uip_ipaddr_copy((addr), uip_netmask)
 172
 173 /** @} */
 174
 175 /**
 176  * \defgroup uipinit uIP initialization functions
 177  * @{
 178  *
 179  * The uIP initialization functions are used for booting uIP.
 180  */
 181
 182 /**
 183  * uIP initialization function.
 184  *
 185  * This function should be called at boot up to initilize the uIP
 186  * TCP/IP stack.
 187  */
 188 void uip_init(void);
 189
 190 /**
 191  * uIP initialization function.
 192  *
 193  * This function may be used at boot time to set the initial ip_id.
 194  */
 195 void uip_setipid(u16_t id);
 196
 197 /** @} */
 198
 199 /**
 200  * \defgroup uipdevfunc uIP device driver functions
 201  * @{
 202  *
 203  * These functions are used by a network device driver for interacting
 204  * with uIP.
 205  */
 206
 207 /**
 208  * Process an incoming packet.
 209  *
 210  * This function should be called when the device driver has received
 211  * a packet from the network. The packet from the device driver must
 212  * be present in the uip_buf buffer, and the length of the packet
 213  * should be placed in the uip_len variable.
 214  *
 215  * When the function returns, there may be an outbound packet placed
 216  * in the uip_buf packet buffer. If so, the uip_len variable is set to
 217  * the length of the packet. If no packet is to be sent out, the
 218  * uip_len variable is set to 0.
 219  *
 220  * The usual way of calling the function is presented by the source
 221  * code below.
 222  \code
 223   uip_len = devicedriver_poll();
 224   if(uip_len > 0) {
 225     uip_input();
 226     if(uip_len > 0) {
 227       devicedriver_send();
 228     }
 229   }
 230  \endcode
 231  *
 232  * \note If you are writing a uIP device driver that needs ARP
 233  * (Address Resolution Protocol), e.g., when running uIP over
 234  * Ethernet, you will need to call the uIP ARP code before calling
 235  * this function:
 236  \code
 237   #define BUF ((struct uip_eth_hdr *)&uip_buf[0])
 238   uip_len = ethernet_devicedrver_poll();
 239   if(uip_len > 0) {
 240     if(BUF->type == HTONS(UIP_ETHTYPE_IP)) {
 241       uip_arp_ipin();
 242       uip_input();
 243       if(uip_len > 0) {
 244         uip_arp_out();
 245         ethernet_devicedriver_send();
 246       }
 247     } else if(BUF->type == HTONS(UIP_ETHTYPE_ARP)) {
 248       uip_arp_arpin();
 249       if(uip_len > 0) {
 250         ethernet_devicedriver_send();
 251       }
 252     }
 253  \endcode
 254  *
 255  * \hideinitializer
 256  */
 257 #define uip_input()        uip_process(UIP_DATA)
 258
 259 /**
 260  * Periodic processing for a connection identified by its number.
 261  *
 262  * This function does the necessary periodic processing (timers,
 263  * polling) for a uIP TCP conneciton, and should be called when the
 264  * periodic uIP timer goes off. It should be called for every
 265  * connection, regardless of whether they are open of closed.
 266  *
 267  * When the function returns, it may have an outbound packet waiting
 268  * for service in the uIP packet buffer, and if so the uip_len
 269  * variable is set to a value larger than zero. The device driver
 270  * should be called to send out the packet.
 271  *
 272  * The ususal way of calling the function is through a for() loop like
 273  * this:
 274  \code
 275   for(i = 0; i < UIP_CONNS; ++i) {
 276     uip_periodic(i);
 277     if(uip_len > 0) {
 278       devicedriver_send();
 279     }
 280   }
 281  \endcode
 282  *
 283  * \note If you are writing a uIP device driver that needs ARP
 284  * (Address Resolution Protocol), e.g., when running uIP over
 285  * Ethernet, you will need to call the uip_arp_out() function before
 286  * calling the device driver:
 287  \code
 288   for(i = 0; i < UIP_CONNS; ++i) {
 289     uip_periodic(i);
 290     if(uip_len > 0) {
 291       uip_arp_out();
 292       ethernet_devicedriver_send();
 293     }
 294   }
 295  \endcode
 296  *
 297  * \param conn The number of the connection which is to be periodically polled.
 298  *
 299  * \hideinitializer
 300  */
 301 #define uip_periodic(conn) do { uip_conn = &uip_conns[conn]; \
 302                                 uip_process(UIP_TIMER); } while (0)
 303
 304 /**
 305  *
 306  *
 307  */
 308 #define uip_conn_active(conn) (uip_conns[conn].tcpstateflags != UIP_CLOSED)
 309
 310 /**
 311  * Perform periodic processing for a connection identified by a pointer
 312  * to its structure.
 313  *
 314  * Same as uip_periodic() but takes a pointer to the actual uip_conn
 315  * struct instead of an integer as its argument. This function can be
 316  * used to force periodic processing of a specific connection.
 317  *
 318  * \param conn A pointer to the uip_conn struct for the connection to
 319  * be processed.
 320  *
 321  * \hideinitializer
 322  */
 323 #define uip_periodic_conn(conn) do { uip_conn = conn; \
 324                                      uip_process(UIP_TIMER); } while (0)
 325
 326 /**
 327  * Reuqest that a particular connection should be polled.
 328  *
 329  * Similar to uip_periodic_conn() but does not perform any timer
 330  * processing. The application is polled for new data.
 331  *
 332  * \param conn A pointer to the uip_conn struct for the connection to
 333  * be processed.
 334  *
 335  * \hideinitializer
 336  */
 337 #define uip_poll_conn(conn) do { uip_conn = conn; \
 338                                  uip_process(UIP_POLL_REQUEST); } while (0)
 339
 340
 341 #if UIP_UDP
 342 /**
 343  * Periodic processing for a UDP connection identified by its number.
 344  *
 345  * This function is essentially the same as uip_periodic(), but for
 346  * UDP connections. It is called in a similar fashion as the
 347  * uip_periodic() function:
 348  \code
 349   for(i = 0; i < UIP_UDP_CONNS; i++) {
 350     uip_udp_periodic(i);
 351     if(uip_len > 0) {
 352       devicedriver_send();
 353     }
 354   }
 355  \endcode
 356  *
 357  * \note As for the uip_periodic() function, special care has to be
 358  * taken when using uIP together with ARP and Ethernet:
 359  \code
 360   for(i = 0; i < UIP_UDP_CONNS; i++) {
 361     uip_udp_periodic(i);
 362     if(uip_len > 0) {
 363       uip_arp_out();
 364       ethernet_devicedriver_send();
 365     }
 366   }
 367  \endcode
 368  *
 369  * \param conn The number of the UDP connection to be processed.
 370  *
 371  * \hideinitializer
 372  */
 373 #define uip_udp_periodic(conn) do { uip_udp_conn = &uip_udp_conns[conn]; \
 374                                 uip_process(UIP_UDP_TIMER); } while (0)
 375
 376 /**
 377  * Periodic processing for a UDP connection identified by a pointer to
 378  * its structure.
 379  *
 380  * Same as uip_udp_periodic() but takes a pointer to the actual
 381  * uip_conn struct instead of an integer as its argument. This
 382  * function can be used to force periodic processing of a specific
 383  * connection.
 384  *
 385  * \param conn A pointer to the uip_udp_conn struct for the connection
 386  * to be processed.
 387  *
 388  * \hideinitializer
 389  */
 390 #define uip_udp_periodic_conn(conn) do { uip_udp_conn = conn; \
 391                                          uip_process(UIP_UDP_TIMER); } while (0)
 392
 393
 394 #endif /* UIP_UDP */
 395
 396 /**
 397  * The uIP packet buffer.
 398  *
 399  * The uip_buf array is used to hold incoming and outgoing
 400  * packets. The device driver should place incoming data into this
 401  * buffer. When sending data, the device driver should read the link
 402  * level headers and the TCP/IP headers from this buffer. The size of
 403  * the link level headers is configured by the UIP_LLH_LEN define.
 404  *
 405  * \note The application data need not be placed in this buffer, so
 406  * the device driver must read it from the place pointed to by the
 407  * uip_appdata pointer as illustrated by the following example:
 408  \code
 409  void
 410  devicedriver_send(void)
 411  {
 412     hwsend(&uip_buf[0], UIP_LLH_LEN);
 413     if(uip_len <= UIP_LLH_LEN + UIP_TCPIP_HLEN) {
 414       hwsend(&uip_buf[UIP_LLH_LEN], uip_len - UIP_LLH_LEN);
 415     } else {
 416       hwsend(&uip_buf[UIP_LLH_LEN], UIP_TCPIP_HLEN);
 417       hwsend(uip_appdata, uip_len - UIP_TCPIP_HLEN - UIP_LLH_LEN);
 418     }
 419  }
 420  \endcode
 421  */
 422 extern u8_t uip_buf[UIP_BUFSIZE+2];
 423
 424 /** @} */
 425
 426 /*---------------------------------------------------------------------------*/
 427 /* Functions that are used by the uIP application program. Opening and
 428  * closing connections, sending and receiving data, etc. is all
 429  * handled by the functions below.
 430 */
 431 /**
 432  * \defgroup uipappfunc uIP application functions
 433  * @{
 434  *
 435  * Functions used by an application running of top of uIP.
 436  */
 437
 438 /**
 439  * Start listening to the specified port.
 440  *
 441  * \note Since this function expects the port number in network byte
 442  * order, a conversion using HTONS() or htons() is necessary.
 443  *
 444  \code
 445  uip_listen(HTONS(80));
 446  \endcode
 447  *
 448  * \param port A 16-bit port number in network byte order.
 449  */
 450 void uip_listen(u16_t port);
 451
 452 /**
 453  * Stop listening to the specified port.
 454  *
 455  * \note Since this function expects the port number in network byte
 456  * order, a conversion using HTONS() or htons() is necessary.
 457  *
 458  \code
 459  uip_unlisten(HTONS(80));
 460  \endcode
 461  *
 462  * \param port A 16-bit port number in network byte order.
 463  */
 464 void uip_unlisten(u16_t port);
 465
 466 /**
 467  * Connect to a remote host using TCP.
 468  *
 469  * This function is used to start a new connection to the specified
 470  * port on the specied host. It allocates a new connection identifier,
 471  * sets the connection to the SYN_SENT state and sets the
 472  * retransmission timer to 0. This will cause a TCP SYN segment to be
 473  * sent out the next time this connection is periodically processed,
 474  * which usually is done within 0.5 seconds after the call to
 475  * uip_connect().
 476  *
 477  * \note This function is avaliable only if support for active open
 478  * has been configured by defining UIP_ACTIVE_OPEN to 1 in uipopt.h.
 479  *
 480  * \note Since this function requires the port number to be in network
 481  * byte order, a conversion using HTONS() or htons() is necessary.
 482  *
 483  \code
 484  uip_ipaddr_t ipaddr;
 485
 486  uip_ipaddr(&ipaddr, 192,168,1,2);
 487  uip_connect(&ipaddr, HTONS(80));
 488  \endcode
 489  *
 490  * \param ripaddr The IP address of the remote hot.
 491  *
 492  * \param port A 16-bit port number in network byte order.
 493  *
 494  * \return A pointer to the uIP connection identifier for the new connection,
 495  * or NULL if no connection could be allocated.
 496  *
 497  */
 498 struct uip_conn *uip_connect(uip_ipaddr_t *ripaddr, u16_t port);
 499
 500
 501
 502 /**
 503  * \internal
 504  *
 505  * Check if a connection has outstanding (i.e., unacknowledged) data.
 506  *
 507  * \param conn A pointer to the uip_conn structure for the connection.
 508  *
 509  * \hideinitializer
 510  */
 511 #define uip_outstanding(conn) ((conn)->len)
 512
 513 /**
 514  * Send data on the current connection.
 515  *
 516  * This function is used to send out a single segment of TCP
 517  * data. Only applications that have been invoked by uIP for event
 518  * processing can send data.
 519  *
 520  * The amount of data that actually is sent out after a call to this
 521  * funcion is determined by the maximum amount of data TCP allows. uIP
 522  * will automatically crop the data so that only the appropriate
 523  * amount of data is sent. The function uip_mss() can be used to query
 524  * uIP for the amount of data that actually will be sent.
 525  *
 526  * \note This function does not guarantee that the sent data will
 527  * arrive at the destination. If the data is lost in the network, the
 528  * application will be invoked with the uip_rexmit() event being
 529  * set. The application will then have to resend the data using this
 530  * function.
 531  *
 532  * \param data A pointer to the data which is to be sent.
 533  *
 534  * \param len The maximum amount of data bytes to be sent.
 535  *
 536  * \hideinitializer
 537  */
 538 void uip_send(const void *data, int len);
 539
 540 /**
 541  * The length of any incoming data that is currently avaliable (if avaliable)
 542  * in the uip_appdata buffer.
 543  *
 544  * The test function uip_data() must first be used to check if there
 545  * is any data available at all.
 546  *
 547  * \hideinitializer
 548  */
 549 /*void uip_datalen(void);*/
 550 #define uip_datalen()       uip_len
 551
 552 /**
 553  * The length of any out-of-band data (urgent data) that has arrived
 554  * on the connection.
 555  *
 556  * \note The configuration parameter UIP_URGDATA must be set for this
 557  * function to be enabled.
 558  *
 559  * \hideinitializer
 560  */
 561 #define uip_urgdatalen()    uip_urglen
 562
 563 /**
 564  * Close the current connection.
 565  *
 566  * This function will close the current connection in a nice way.
 567  *
 568  * \hideinitializer
 569  */
 570 #define uip_close()         (uip_flags = UIP_CLOSE)
 571
 572 /**
 573  * Abort the current connection.
 574  *
 575  * This function will abort (reset) the current connection, and is
 576  * usually used when an error has occured that prevents using the
 577  * uip_close() function.
 578  *
 579  * \hideinitializer
 580  */
 581 #define uip_abort()         (uip_flags = UIP_ABORT)
 582
 583 /**
 584  * Tell the sending host to stop sending data.
 585  *
 586  * This function will close our receiver's window so that we stop
 587  * receiving data for the current connection.
 588  *
 589  * \hideinitializer
 590  */
 591 #define uip_stop()          (uip_conn->tcpstateflags |= UIP_STOPPED)
 592
 593 /**
 594  * Find out if the current connection has been previously stopped with
 595  * uip_stop().
 596  *
 597  * \hideinitializer
 598  */
 599 #define uip_stopped(conn)   ((conn)->tcpstateflags & UIP_STOPPED)
 600
 601 /**
 602  * Restart the current connection, if is has previously been stopped
 603  * with uip_stop().
 604  *
 605  * This function will open the receiver's window again so that we
 606  * start receiving data for the current connection.
 607  *
 608  * \hideinitializer
 609  */
 610 #define uip_restart()         do { uip_flags |= UIP_NEWDATA; \
 611                                    uip_conn->tcpstateflags &= ~UIP_STOPPED; \
 612                               } while(0)
 613
 614
 615 /* uIP tests that can be made to determine in what state the current
 616    connection is, and what the application function should do. */
 617
 618 /**
 619  * Is the current connection a UDP connection?
 620  *
 621  * This function checks whether the current connection is a UDP connection.
 622  *
 623  * \hideinitializer
 624  *
 625  */
 626 #define uip_udpconnection() (uip_conn == NULL)
 627
 628 /**
 629  * Is new incoming data available?
 630  *
 631  * Will reduce to non-zero if there is new data for the application
 632  * present at the uip_appdata pointer. The size of the data is
 633  * avaliable through the uip_len variable.
 634  *
 635  * \hideinitializer
 636  */
 637 #define uip_newdata()   (uip_flags & UIP_NEWDATA)
 638
 639 /**
 640  * Has previously sent data been acknowledged?
 641  *
 642  * Will reduce to non-zero if the previously sent data has been
 643  * acknowledged by the remote host. This means that the application
 644  * can send new data.
 645  *
 646  * \hideinitializer
 647  */
 648 #define uip_acked()   (uip_flags & UIP_ACKDATA)
 649
 650 /**
 651  * Has the connection just been connected?
 652  *
 653  * Reduces to non-zero if the current connection has been connected to
 654  * a remote host. This will happen both if the connection has been
 655  * actively opened (with uip_connect()) or passively opened (with
 656  * uip_listen()).
 657  *
 658  * \hideinitializer
 659  */
 660 #define uip_connected() (uip_flags & UIP_CONNECTED)
 661
 662 /**
 663  * Has the connection been closed by the other end?
 664  *
 665  * Is non-zero if the connection has been closed by the remote
 666  * host. The application may then do the necessary clean-ups.
 667  *
 668  * \hideinitializer
 669  */
 670 #define uip_closed()    (uip_flags & UIP_CLOSE)
 671
 672 /**
 673  * Has the connection been aborted by the other end?
 674  *
 675  * Non-zero if the current connection has been aborted (reset) by the
 676  * remote host.
 677  *
 678  * \hideinitializer
 679  */
 680 #define uip_aborted()    (uip_flags & UIP_ABORT)
 681
 682 /**
 683  * Has the connection timed out?
 684  *
 685  * Non-zero if the current connection has been aborted due to too many
 686  * retransmissions.
 687  *
 688  * \hideinitializer
 689  */
 690 #define uip_timedout()    (uip_flags & UIP_TIMEDOUT)
 691
 692 /**
 693  * Do we need to retransmit previously data?
 694  *
 695  * Reduces to non-zero if the previously sent data has been lost in
 696  * the network, and the application should retransmit it. The
 697  * application should send the exact same data as it did the last
 698  * time, using the uip_send() function.
 699  *
 700  * \hideinitializer
 701  */
 702 #define uip_rexmit()     (uip_flags & UIP_REXMIT)
 703
 704 /**
 705  * Is the connection being polled by uIP?
 706  *
 707  * Is non-zero if the reason the application is invoked is that the
 708  * current connection has been idle for a while and should be
 709  * polled.
 710  *
 711  * The polling event can be used for sending data without having to
 712  * wait for the remote host to send data.
 713  *
 714  * \hideinitializer
 715  */
 716 #define uip_poll()       (uip_flags & UIP_POLL)
 717
 718 /**
 719  * Get the initial maxium segment size (MSS) of the current
 720  * connection.
 721  *
 722  * \hideinitializer
 723  */
 724 #define uip_initialmss()             (uip_conn->initialmss)
 725
 726 /**
 727  * Get the current maxium segment size that can be sent on the current
 728  * connection.
 729  *
 730  * The current maxiumum segment size that can be sent on the
 731  * connection is computed from the receiver's window and the MSS of
 732  * the connection (which also is available by calling
 733  * uip_initialmss()).
 734  *
 735  * \hideinitializer
 736  */
 737 #define uip_mss()             (uip_conn->mss)
 738
 739 /**
 740  * Set up a new UDP connection.
 741  *
 742  * This function sets up a new UDP connection. The function will
 743  * automatically allocate an unused local port for the new
 744  * connection. However, another port can be chosen by using the
 745  * uip_udp_bind() call, after the uip_udp_new() function has been
 746  * called.
 747  *
 748  * Example:
 749  \code
 750  uip_ipaddr_t addr;
 751  struct uip_udp_conn *c;
 752
 753  uip_ipaddr(&addr, 192,168,2,1);
 754  c = uip_udp_new(&addr, HTONS(12345));
 755  if(c != NULL) {
 756    uip_udp_bind(c, HTONS(12344));
 757  }
 758  \endcode
 759  * \param ripaddr The IP address of the remote host.
 760  *
 761  * \param rport The remote port number in network byte order.
 762  *
 763  * \return The uip_udp_conn structure for the new connection or NULL
 764  * if no connection could be allocated.
 765  */
 766 struct uip_udp_conn *uip_udp_new(uip_ipaddr_t *ripaddr, u16_t rport);
 767
 768 /**
 769  * Removed a UDP connection.
 770  *
 771  * \param conn A pointer to the uip_udp_conn structure for the connection.
 772  *
 773  * \hideinitializer
 774  */
 775 #define uip_udp_remove(conn) (conn)->lport = 0
 776
 777 /**
 778  * Bind a UDP connection to a local port.
 779  *
 780  * \param conn A pointer to the uip_udp_conn structure for the
 781  * connection.
 782  *
 783  * \param port The local port number, in network byte order.
 784  *
 785  * \hideinitializer
 786  */
 787 #define uip_udp_bind(conn, port) (conn)->lport = port
 788
 789 /**
 790  * Send a UDP datagram of length len on the current connection.
 791  *
 792  * This function can only be called in response to a UDP event (poll
 793  * or newdata). The data must be present in the uip_buf buffer, at the
 794  * place pointed to by the uip_appdata pointer.
 795  *
 796  * \param len The length of the data in the uip_buf buffer.
 797  *
 798  * \hideinitializer
 799  */
 800 #define uip_udp_send(len) uip_send((char *)uip_appdata, len)
 801
 802 /** @} */
 803
 804 /* uIP convenience and converting functions. */
 805
 806 /**
 807  * \defgroup uipconvfunc uIP conversion functions
 808  * @{
 809  *
 810  * These functions can be used for converting between different data
 811  * formats used by uIP.
 812  */
 813
 814 /**
 815  * Construct an IP address from four bytes.
 816  *
 817  * This function constructs an IP address of the type that uIP handles
 818  * internally from four bytes. The function is handy for specifying IP
 819  * addresses to use with e.g. the uip_connect() function.
 820  *
 821  * Example:
 822  \code
 823  uip_ipaddr_t ipaddr;
 824  struct uip_conn *c;
 825
 826  uip_ipaddr(&ipaddr, 192,168,1,2);
 827  c = uip_connect(&ipaddr, HTONS(80));
 828  \endcode
 829  *
 830  * \param addr A pointer to a uip_ipaddr_t variable that will be
 831  * filled in with the IP address.
 832  *
 833  * \param addr0 The first octet of the IP address.
 834  * \param addr1 The second octet of the IP address.
 835  * \param addr2 The third octet of the IP address.
 836  * \param addr3 The forth octet of the IP address.
 837  *
 838  * \hideinitializer
 839  */
 840 #define uip_ipaddr(addr, addr0,addr1,addr2,addr3) do { \
 841                      ((u16_t *)(addr))[0] = HTONS(((addr0) << 8) | (addr1)); \
 842                      ((u16_t *)(addr))[1] = HTONS(((addr2) << 8) | (addr3)); \
 843                   } while(0)
 844
 845 /**
 846  * Construct an IPv6 address from eight 16-bit words.
 847  *
 848  * This function constructs an IPv6 address.
 849  *
 850  * \hideinitializer
 851  */
 852 #define uip_ip6addr(addr, addr0,addr1,addr2,addr3,addr4,addr5,addr6,addr7) do { \
 853                      ((u16_t *)(addr))[0] = HTONS((addr0)); \
 854                      ((u16_t *)(addr))[1] = HTONS((addr1)); \
 855                      ((u16_t *)(addr))[2] = HTONS((addr2)); \
 856                      ((u16_t *)(addr))[3] = HTONS((addr3)); \
 857                      ((u16_t *)(addr))[4] = HTONS((addr4)); \
 858                      ((u16_t *)(addr))[5] = HTONS((addr5)); \
 859                      ((u16_t *)(addr))[6] = HTONS((addr6)); \
 860                      ((u16_t *)(addr))[7] = HTONS((addr7)); \
 861                   } while(0)
 862
 863 /**
 864  * Copy an IP address to another IP address.
 865  *
 866  * Copies an IP address from one place to another.
 867  *
 868  * Example:
 869  \code
 870  uip_ipaddr_t ipaddr1, ipaddr2;
 871
 872  uip_ipaddr(&ipaddr1, 192,16,1,2);
 873  uip_ipaddr_copy(&ipaddr2, &ipaddr1);
 874  \endcode
 875  *
 876  * \param dest The destination for the copy.
 877  * \param src The source from where to copy.
 878  *
 879  * \hideinitializer
 880  */
 881 #if !UIP_CONF_IPV6
 882 #define uip_ipaddr_copy(dest, src) do { \
 883                      ((u16_t *)dest)[0] = ((u16_t *)src)[0]; \
 884                      ((u16_t *)dest)[1] = ((u16_t *)src)[1]; \
 885                   } while(0)
 886 #else /* !UIP_CONF_IPV6 */
 887 #define uip_ipaddr_copy(dest, src) memcpy(dest, src, sizeof(uip_ip6addr_t))
 888 #endif /* !UIP_CONF_IPV6 */
 889
 890 /**
 891  * Compare two IP addresses
 892  *
 893  * Compares two IP addresses.
 894  *
 895  * Example:
 896  \code
 897  uip_ipaddr_t ipaddr1, ipaddr2;
 898
 899  uip_ipaddr(&ipaddr1, 192,16,1,2);
 900  if(uip_ipaddr_cmp(&ipaddr2, &ipaddr1)) {
 901     printf("They are the same");
 902  }
 903  \endcode
 904  *
 905  * \param addr1 The first IP address.
 906  * \param addr2 The second IP address.
 907  *
 908  * \hideinitializer
 909  */
 910 #if !UIP_CONF_IPV6
 911 #define uip_ipaddr_cmp(addr1, addr2) (((u16_t *)addr1)[0] == ((u16_t *)addr2)[0] && \
 912                                       ((u16_t *)addr1)[1] == ((u16_t *)addr2)[1])
 913 #else /* !UIP_CONF_IPV6 */
 914 #define uip_ipaddr_cmp(addr1, addr2) (memcmp(addr1, addr2, sizeof(uip_ip6addr_t)) == 0)
 915 #endif /* !UIP_CONF_IPV6 */
 916
 917 /**
 918  * Compare two IP addresses with netmasks
 919  *
 920  * Compares two IP addresses with netmasks. The masks are used to mask
 921  * out the bits that are to be compared.
 922  *
 923  * Example:
 924  \code
 925  uip_ipaddr_t ipaddr1, ipaddr2, mask;
 926
 927  uip_ipaddr(&mask, 255,255,255,0);
 928  uip_ipaddr(&ipaddr1, 192,16,1,2);
 929  uip_ipaddr(&ipaddr2, 192,16,1,3);
 930  if(uip_ipaddr_maskcmp(&ipaddr1, &ipaddr2, &mask)) {
 931     printf("They are the same");
 932  }
 933  \endcode
 934  *
 935  * \param addr1 The first IP address.
 936  * \param addr2 The second IP address.
 937  * \param mask The netmask.
 938  *
 939  * \hideinitializer
 940  */
 941 #define uip_ipaddr_maskcmp(addr1, addr2, mask) \
 942                           (((((u16_t *)addr1)[0] & ((u16_t *)mask)[0]) == \
 943                             (((u16_t *)addr2)[0] & ((u16_t *)mask)[0])) && \
 944                            ((((u16_t *)addr1)[1] & ((u16_t *)mask)[1]) == \
 945                             (((u16_t *)addr2)[1] & ((u16_t *)mask)[1])))
 946
 947
 948 /**
 949  * Mask out the network part of an IP address.
 950  *
 951  * Masks out the network part of an IP address, given the address and
 952  * the netmask.
 953  *
 954  * Example:
 955  \code
 956  uip_ipaddr_t ipaddr1, ipaddr2, netmask;
 957
 958  uip_ipaddr(&ipaddr1, 192,16,1,2);
 959  uip_ipaddr(&netmask, 255,255,255,0);
 960  uip_ipaddr_mask(&ipaddr2, &ipaddr1, &netmask);
 961  \endcode
 962  *
 963  * In the example above, the variable "ipaddr2" will contain the IP
 964  * address 192.168.1.0.
 965  *
 966  * \param dest Where the result is to be placed.
 967  * \param src The IP address.
 968  * \param mask The netmask.
 969  *
 970  * \hideinitializer
 971  */
 972 #define uip_ipaddr_mask(dest, src, mask) do { \
 973                      ((u16_t *)dest)[0] = ((u16_t *)src)[0] & ((u16_t *)mask)[0]; \
 974                      ((u16_t *)dest)[1] = ((u16_t *)src)[1] & ((u16_t *)mask)[1]; \
 975                   } while(0)
 976
 977 /**
 978  * Pick the first octet of an IP address.
 979  *
 980  * Picks out the first octet of an IP address.
 981  *
 982  * Example:
 983  \code
 984  uip_ipaddr_t ipaddr;
 985  u8_t octet;
 986
 987  uip_ipaddr(&ipaddr, 1,2,3,4);
 988  octet = uip_ipaddr1(&ipaddr);
 989  \endcode
 990  *
 991  * In the example above, the variable "octet" will contain the value 1.
 992  *
 993  * \hideinitializer
 994  */
 995 #define uip_ipaddr1(addr) (htons(((u16_t *)(addr))[0]) >> 8)
 996
 997 /**
 998  * Pick the second octet of an IP address.
 999  *
1000  * Picks out the second octet of an IP address.
1001  *
1002  * Example:
1003  \code
1004  uip_ipaddr_t ipaddr;
1005  u8_t octet;
1006
1007  uip_ipaddr(&ipaddr, 1,2,3,4);
1008  octet = uip_ipaddr2(&ipaddr);
1009  \endcode
1010  *
1011  * In the example above, the variable "octet" will contain the value 2.
1012  *
1013  * \hideinitializer
1014  */
1015 #define uip_ipaddr2(addr) (htons(((u16_t *)(addr))[0]) & 0xff)
1016
1017 /**
1018  * Pick the third octet of an IP address.
1019  *
1020  * Picks out the third octet of an IP address.
1021  *
1022  * Example:
1023  \code
1024  uip_ipaddr_t ipaddr;
1025  u8_t octet;
1026
1027  uip_ipaddr(&ipaddr, 1,2,3,4);
1028  octet = uip_ipaddr3(&ipaddr);
1029  \endcode
1030  *
1031  * In the example above, the variable "octet" will contain the value 3.
1032  *
1033  * \hideinitializer
1034  */
1035 #define uip_ipaddr3(addr) (htons(((u16_t *)(addr))[1]) >> 8)
1036
1037 /**
1038  * Pick the fourth octet of an IP address.
1039  *
1040  * Picks out the fourth octet of an IP address.
1041  *
1042  * Example:
1043  \code
1044  uip_ipaddr_t ipaddr;
1045  u8_t octet;
1046
1047  uip_ipaddr(&ipaddr, 1,2,3,4);
1048  octet = uip_ipaddr4(&ipaddr);
1049  \endcode
1050  *
1051  * In the example above, the variable "octet" will contain the value 4.
1052  *
1053  * \hideinitializer
1054  */
1055 #define uip_ipaddr4(addr) (htons(((u16_t *)(addr))[1]) & 0xff)
1056
1057 /**
1058  * Convert 16-bit quantity from host byte order to network byte order.
1059  *
1060  * This macro is primarily used for converting constants from host
1061  * byte order to network byte order. For converting variables to
1062  * network byte order, use the htons() function instead.
1063  *
1064  * \hideinitializer
1065  */
1066 #ifndef HTONS
1067 #   if UIP_BYTE_ORDER == UIP_BIG_ENDIAN
1068 #      define HTONS(n) (n)
1069 #   else /* UIP_BYTE_ORDER == UIP_BIG_ENDIAN */
1070 #      define HTONS(n) (u16_t)((((u16_t) (n)) << 8) | (((u16_t) (n)) >> 8))
1071 #   endif /* UIP_BYTE_ORDER == UIP_BIG_ENDIAN */
1072 #else
1073 #error "HTONS already defined!"
1074 #endif /* HTONS */
1075
1076 /**
1077  * Convert 16-bit quantity from host byte order to network byte order.
1078  *
1079  * This function is primarily used for converting variables from host
1080  * byte order to network byte order. For converting constants to
1081  * network byte order, use the HTONS() macro instead.
1082  */
1083 #ifndef htons
1084 u16_t htons(u16_t val);
1085 #endif /* htons */
1086 #ifndef ntohs
1087 #define ntohs htons
1088 #endif
1089
1090 /** @} */
1091
1092 /**
1093  * Pointer to the application data in the packet buffer.
1094  *
1095  * This pointer points to the application data when the application is
1096  * called. If the application wishes to send data, the application may
1097  * use this space to write the data into before calling uip_send().
1098  */
1099 extern void *uip_appdata;
1100
1101 #if UIP_URGDATA > 0
1102 /* u8_t *uip_urgdata:
1103  *
1104  * This pointer points to any urgent data that has been received. Only
1105  * present if compiled with support for urgent data (UIP_URGDATA).
1106  */
1107 extern void *uip_urgdata;
1108 #endif /* UIP_URGDATA > 0 */
1109
1110
1111 /**
1112  * \defgroup uipdrivervars Variables used in uIP device drivers
1113  * @{
1114  *
1115  * uIP has a few global variables that are used in device drivers for
1116  * uIP.
1117  */
1118
1119 /**
1120  * The length of the packet in the uip_buf buffer.
1121  *
1122  * The global variable uip_len holds the length of the packet in the
1123  * uip_buf buffer.
1124  *
1125  * When the network device driver calls the uIP input function,
1126  * uip_len should be set to the length of the packet in the uip_buf
1127  * buffer.
1128  *
1129  * When sending packets, the device driver should use the contents of
1130  * the uip_len variable to determine the length of the outgoing
1131  * packet.
1132  *
1133  */
1134 extern u16_t uip_len;
1135
1136 /** @} */
1137
1138 #if UIP_URGDATA > 0
1139 extern u16_t uip_urglen, uip_surglen;
1140 #endif /* UIP_URGDATA > 0 */
1141
1142
1143 /**
1144  * Representation of a uIP TCP connection.
1145  *
1146  * The uip_conn structure is used for identifying a connection. All
1147  * but one field in the structure are to be considered read-only by an
1148  * application. The only exception is the appstate field whos purpose
1149  * is to let the application store application-specific state (e.g.,
1150  * file pointers) for the connection. The type of this field is
1151  * configured in the "uipopt.h" header file.
1152  */
1153 struct uip_conn {
1154   uip_ipaddr_t ripaddr;   /**< The IP address of the remote host. */
1155
1156   u16_t lport;        /**< The local TCP port, in network byte order. */
1157   u16_t rport;        /**< The local remote TCP port, in network byte
1158                          order. */
1159
1160   u8_t rcv_nxt[4];    /**< The sequence number that we expect to
1161                          receive next. */
1162   u8_t snd_nxt[4];    /**< The sequence number that was last sent by
1163                          us. */
1164   u16_t len;          /**< Length of the data that was previously sent. */
1165   u16_t mss;          /**< Current maximum segment size for the
1166                          connection. */
1167   u16_t initialmss;   /**< Initial maximum segment size for the
1168                          connection. */
1169   u8_t sa;            /**< Retransmission time-out calculation state
1170                          variable. */
1171   u8_t sv;            /**< Retransmission time-out calculation state
1172                          variable. */
1173   u8_t rto;           /**< Retransmission time-out. */
1174   u8_t tcpstateflags; /**< TCP state and flags. */
1175   u8_t timer;         /**< The retransmission timer. */
1176   u8_t nrtx;          /**< The number of retransmissions for the last
1177                          segment sent. */
1178
1179   /** The application state. */
1180   uip_tcp_appstate_t appstate;
1181 };
1182
1183
1184 /**
1185  * Pointer to the current TCP connection.
1186  *
1187  * The uip_conn pointer can be used to access the current TCP
1188  * connection.
1189  */
1190 extern struct uip_conn *uip_conn;
1191 /* The array containing all uIP connections. */
1192 extern struct uip_conn uip_conns[UIP_CONNS];
1193 /**
1194  * \addtogroup uiparch
1195  * @{
1196  */
1197
1198 /**
1199  * 4-byte array used for the 32-bit sequence number calculations.
1200  */
1201 extern u8_t uip_acc32[4];
1202
1203 /** @} */
1204
1205
1206 #if UIP_UDP
1207 /**
1208  * Representation of a uIP UDP connection.
1209  */
1210 struct uip_udp_conn {
1211   uip_ipaddr_t ripaddr;   /**< The IP address of the remote peer. */
1212   u16_t lport;        /**< The local port number in network byte order. */
1213   u16_t rport;        /**< The remote port number in network byte order. */
1214   u8_t  ttl;          /**< Default time-to-live. */
1215
1216   /** The application state. */
1217   uip_udp_appstate_t appstate;
1218 };
1219
1220 /**
1221  * The current UDP connection.
1222  */
1223 extern struct uip_udp_conn *uip_udp_conn;
1224 extern struct uip_udp_conn uip_udp_conns[UIP_UDP_CONNS];
1225 #endif /* UIP_UDP */
1226
1227 /**
1228  * The structure holding the TCP/IP statistics that are gathered if
1229  * UIP_STATISTICS is set to 1.
1230  *
1231  */
1232 struct uip_stats {
1233   struct {
1234     uip_stats_t drop;     /**< Number of dropped packets at the IP
1235                              layer. */
1236     uip_stats_t recv;     /**< Number of received packets at the IP
1237                              layer. */
1238     uip_stats_t sent;     /**< Number of sent packets at the IP
1239                              layer. */
1240     uip_stats_t vhlerr;   /**< Number of packets dropped due to wrong
1241                              IP version or header length. */
1242     uip_stats_t hblenerr; /**< Number of packets dropped due to wrong
1243                              IP length, high byte. */
1244     uip_stats_t lblenerr; /**< Number of packets dropped due to wrong
1245                              IP length, low byte. */
1246     uip_stats_t fragerr;  /**< Number of packets dropped since they
1247                              were IP fragments. */
1248     uip_stats_t chkerr;   /**< Number of packets dropped due to IP
1249                              checksum errors. */
1250     uip_stats_t protoerr; /**< Number of packets dropped since they
1251                              were neither ICMP, UDP nor TCP. */
1252   } ip;                   /**< IP statistics. */
1253   struct {
1254     uip_stats_t drop;     /**< Number of dropped ICMP packets. */
1255     uip_stats_t recv;     /**< Number of received ICMP packets. */
1256     uip_stats_t sent;     /**< Number of sent ICMP packets. */
1257     uip_stats_t typeerr;  /**< Number of ICMP packets with a wrong
1258                              type. */
1259   } icmp;                 /**< ICMP statistics. */
1260   struct {
1261     uip_stats_t drop;     /**< Number of dropped TCP segments. */
1262     uip_stats_t recv;     /**< Number of recived TCP segments. */
1263     uip_stats_t sent;     /**< Number of sent TCP segments. */
1264     uip_stats_t chkerr;   /**< Number of TCP segments with a bad
1265                              checksum. */
1266     uip_stats_t ackerr;   /**< Number of TCP segments with a bad ACK
1267                              number. */
1268     uip_stats_t rst;      /**< Number of recevied TCP RST (reset) segments. */
1269     uip_stats_t rexmit;   /**< Number of retransmitted TCP segments. */
1270     uip_stats_t syndrop;  /**< Number of dropped SYNs due to too few
1271                              connections was avaliable. */
1272     uip_stats_t synrst;   /**< Number of SYNs for closed ports,
1273                              triggering a RST. */
1274   } tcp;                  /**< TCP statistics. */
1275 #if UIP_UDP
1276   struct {
1277     uip_stats_t drop;     /**< Number of dropped UDP segments. */
1278     uip_stats_t recv;     /**< Number of recived UDP segments. */
1279     uip_stats_t sent;     /**< Number of sent UDP segments. */
1280     uip_stats_t chkerr;   /**< Number of UDP segments with a bad
1281                              checksum. */
1282   } udp;                  /**< UDP statistics. */
1283 #endif /* UIP_UDP */
1284 };
1285
1286 /**
1287  * The uIP TCP/IP statistics.
1288  *
1289  * This is the variable in which the uIP TCP/IP statistics are gathered.
1290  */
1291 extern struct uip_stats uip_stat;
1292
1293
1294 /*---------------------------------------------------------------------------*/
1295 /* All the stuff below this point is internal to uIP and should not be
1296  * used directly by an application or by a device driver.
1297  */
1298 /*---------------------------------------------------------------------------*/
1299 /* u8_t uip_flags:
1300  *
1301  * When the application is called, uip_flags will contain the flags
1302  * that are defined in this file. Please read below for more
1303  * infomation.
1304  */
1305 extern u8_t uip_flags;
1306
1307 /* The following flags may be set in the global variable uip_flags
1308    before calling the application callback. The UIP_ACKDATA,
1309    UIP_NEWDATA, and UIP_CLOSE flags may both be set at the same time,
1310    whereas the others are mutualy exclusive. Note that these flags
1311    should *NOT* be accessed directly, but only through the uIP
1312    functions/macros. */
1313
1314 #define UIP_ACKDATA   1     /* Signifies that the outstanding data was
1315                                acked and the application should send
1316                                out new data instead of retransmitting
1317                                the last data. */
1318 #define UIP_NEWDATA   2     /* Flags the fact that the peer has sent
1319                                us new data. */
1320 #define UIP_REXMIT    4     /* Tells the application to retransmit the
1321                                data that was last sent. */
1322 #define UIP_POLL      8     /* Used for polling the application, to
1323                                check if the application has data that
1324                                it wants to send. */
1325 #define UIP_CLOSE     16    /* The remote host has closed the
1326                                connection, thus the connection has
1327                                gone away. Or the application signals
1328                                that it wants to close the
1329                                connection. */
1330 #define UIP_ABORT     32    /* The remote host has aborted the
1331                                connection, thus the connection has
1332                                gone away. Or the application signals
1333                                that it wants to abort the
1334                                connection. */
1335 #define UIP_CONNECTED 64    /* We have got a connection from a remote
1336                                host and have set up a new connection
1337                                for it, or an active connection has
1338                                been successfully established. */
1339
1340 #define UIP_TIMEDOUT  128   /* The connection has been aborted due to
1341                                too many retransmissions. */
1342
1343 /* uip_process(flag):
1344  *
1345  * The actual uIP function which does all the work.
1346  */
1347 void uip_process(u8_t flag);
1348
1349 /* The following flags are passed as an argument to the uip_process()
1350    function. They are used to distinguish between the two cases where
1351    uip_process() is called. It can be called either because we have
1352    incoming data that should be processed, or because the periodic
1353    timer has fired. These values are never used directly, but only in
1354    the macrose defined in this file. */
1355
1356 #define UIP_DATA          1     /* Tells uIP that there is incoming
1357                                    data in the uip_buf buffer. The
1358                                    length of the data is stored in the
1359                                    global variable uip_len. */
1360 #define UIP_TIMER         2     /* Tells uIP that the periodic timer
1361                                    has fired. */
1362 #define UIP_POLL_REQUEST  3     /* Tells uIP that a connection should
1363                                    be polled. */
1364 #define UIP_UDP_SEND_CONN 4     /* Tells uIP that a UDP datagram
1365                                    should be constructed in the
1366                                    uip_buf buffer. */
1367 #if UIP_UDP
1368 #define UIP_UDP_TIMER     5
1369 #endif /* UIP_UDP */
1370
1371 /* The TCP states used in the uip_conn->tcpstateflags. */
1372 #define UIP_CLOSED      0
1373 #define UIP_SYN_RCVD    1
1374 #define UIP_SYN_SENT    2
1375 #define UIP_ESTABLISHED 3
1376 #define UIP_FIN_WAIT_1  4
1377 #define UIP_FIN_WAIT_2  5
1378 #define UIP_CLOSING     6
1379 #define UIP_TIME_WAIT   7
1380 #define UIP_LAST_ACK    8
1381 #define UIP_TS_MASK     15
1382
1383 #define UIP_STOPPED      16
1384
1385 /* The TCP and IP headers. */
1386 struct uip_tcpip_hdr {
1387 #if UIP_CONF_IPV6
1388   /* IPv6 header. */
1389   u8_t vtc,
1390     tcflow;
1391   u16_t flow;
1392   u8_t len[2];
1393   u8_t proto, ttl;
1394   uip_ip6addr_t srcipaddr, destipaddr;
1395 #else /* UIP_CONF_IPV6 */
1396   /* IPv4 header. */
1397   u8_t vhl,
1398     tos,
1399     len[2],
1400     ipid[2],
1401     ipoffset[2],
1402     ttl,
1403     proto;
1404   u16_t ipchksum;
1405   u16_t srcipaddr[2],
1406     destipaddr[2];
1407 #endif /* UIP_CONF_IPV6 */
1408
1409   /* TCP header. */
1410   u16_t srcport,
1411     destport;
1412   u8_t seqno[4],
1413     ackno[4],
1414     tcpoffset,
1415     flags,
1416     wnd[2];
1417   u16_t tcpchksum;
1418   u8_t urgp[2];
1419   u8_t optdata[4];
1420 };
1421
1422 /* The ICMP and IP headers. */
1423 struct uip_icmpip_hdr {
1424 #if UIP_CONF_IPV6
1425   /* IPv6 header. */
1426   u8_t vtc,
1427     tcf;
1428   u16_t flow;
1429   u8_t len[2];
1430   u8_t proto, ttl;
1431   uip_ip6addr_t srcipaddr, destipaddr;
1432 #else /* UIP_CONF_IPV6 */
1433   /* IPv4 header. */
1434   u8_t vhl,
1435     tos,
1436     len[2],
1437     ipid[2],
1438     ipoffset[2],
1439     ttl,
1440     proto;
1441   u16_t ipchksum;
1442   u16_t srcipaddr[2],
1443     destipaddr[2];
1444 #endif /* UIP_CONF_IPV6 */
1445
1446   /* ICMP (echo) header. */
1447   u8_t type, icode;
1448   u16_t icmpchksum;
1449 #if !UIP_CONF_IPV6
1450   u16_t id, seqno;
1451 #else /* !UIP_CONF_IPV6 */
1452   u8_t flags, reserved1, reserved2, reserved3;
1453   u8_t icmp6data[16];
1454   u8_t options[1];
1455 #endif /* !UIP_CONF_IPV6 */
1456 };
1457
1458
1459 /* The UDP and IP headers. */
1460 struct uip_udpip_hdr {
1461 #if UIP_CONF_IPV6
1462   /* IPv6 header. */
1463   u8_t vtc,
1464     tcf;
1465   u16_t flow;
1466   u8_t len[2];
1467   u8_t proto, ttl;
1468   uip_ip6addr_t srcipaddr, destipaddr;
1469 #else /* UIP_CONF_IPV6 */
1470   /* IP header. */
1471   u8_t vhl,
1472     tos,
1473     len[2],
1474     ipid[2],
1475     ipoffset[2],
1476     ttl,
1477     proto;
1478   u16_t ipchksum;
1479   u16_t srcipaddr[2],
1480     destipaddr[2];
1481 #endif /* UIP_CONF_IPV6 */
1482
1483   /* UDP header. */
1484   u16_t srcport,
1485     destport;
1486   u16_t udplen;
1487   u16_t udpchksum;
1488 };
1489
1490
1491
1492 /**
1493  * The buffer size available for user data in the \ref uip_buf buffer.
1494  *
1495  * This macro holds the available size for user data in the \ref
1496  * uip_buf buffer. The macro is intended to be used for checking
1497  * bounds of available user data.
1498  *
1499  * Example:
1500  \code
1501  snprintf(uip_appdata, UIP_APPDATA_SIZE, "%u\n", i);
1502  \endcode
1503  *
1504  * \hideinitializer
1505  */
1506 #define UIP_APPDATA_SIZE (UIP_BUFSIZE - UIP_LLH_LEN - UIP_TCPIP_HLEN)
1507
1508
1509 #define UIP_PROTO_ICMP  1
1510 #define UIP_PROTO_TCP   6
1511 #define UIP_PROTO_UDP   17
1512 #define UIP_PROTO_ICMP6 58
1513
1514 /* Header sizes. */
1515 #if UIP_CONF_IPV6
1516 #define UIP_IPH_LEN    40
1517 #else /* UIP_CONF_IPV6 */
1518 #define UIP_IPH_LEN    20    /* Size of IP header */
1519 #endif /* UIP_CONF_IPV6 */
1520 #define UIP_UDPH_LEN    8    /* Size of UDP header */
1521 #define UIP_TCPH_LEN   20    /* Size of TCP header */
1522 #define UIP_IPUDPH_LEN (UIP_UDPH_LEN + UIP_IPH_LEN)    /* Size of IP +
1523                                                           UDP
1524                                                           header */
1525 #define UIP_IPTCPH_LEN (UIP_TCPH_LEN + UIP_IPH_LEN)    /* Size of IP +
1526                                                           TCP
1527                                                           header */
1528 #define UIP_TCPIP_HLEN UIP_IPTCPH_LEN
1529
1530
1531 #if UIP_FIXEDADDR
1532 extern const uip_ipaddr_t uip_hostaddr, uip_netmask, uip_draddr;
1533 #else /* UIP_FIXEDADDR */
1534 extern uip_ipaddr_t uip_hostaddr, uip_netmask, uip_draddr;
1535 #endif /* UIP_FIXEDADDR */
1536
1537
1538
1539 /**
1540  * Representation of a 48-bit Ethernet address.
1541  */
1542 struct uip_eth_addr {
1543   u8_t addr[6];
1544 };
1545
1546 /**
1547  * Calculate the Internet checksum over a buffer.
1548  *
1549  * The Internet checksum is the one's complement of the one's
1550  * complement sum of all 16-bit words in the buffer.
1551  *
1552  * See RFC1071.
1553  *
1554  * \param buf A pointer to the buffer over which the checksum is to be
1555  * computed.
1556  *
1557  * \param len The length of the buffer over which the checksum is to
1558  * be computed.
1559  *
1560  * \return The Internet checksum of the buffer.
1561  */
1562 u16_t uip_chksum(u16_t *buf, u16_t len);
1563
1564 /**
1565  * Calculate the IP header checksum of the packet header in uip_buf.
1566  *
1567  * The IP header checksum is the Internet checksum of the 20 bytes of
1568  * the IP header.
1569  *
1570  * \return The IP header checksum of the IP header in the uip_buf
1571  * buffer.
1572  */
1573 u16_t uip_ipchksum(void);
1574
1575 /**
1576  * Calculate the TCP checksum of the packet in uip_buf and uip_appdata.
1577  *
1578  * The TCP checksum is the Internet checksum of data contents of the
1579  * TCP segment, and a pseudo-header as defined in RFC793.
1580  *
1581  * \return The TCP checksum of the TCP segment in uip_buf and pointed
1582  * to by uip_appdata.
1583  */
1584 u16_t uip_tcpchksum(void);
1585
1586 /**
1587  * Calculate the UDP checksum of the packet in uip_buf and uip_appdata.
1588  *
1589  * The UDP checksum is the Internet checksum of data contents of the
1590  * UDP segment, and a pseudo-header as defined in RFC768.
1591  *
1592  * \return The UDP checksum of the UDP segment in uip_buf and pointed
1593  * to by uip_appdata.
1594  */
1595 u16_t uip_udpchksum(void);
1596
1597
1598 #endif /* __UIP_H__ */
1599
1600
1601 /** @} */