net/irda/irnet/irnet.h

   1 /*
   2  *      IrNET protocol module : Synchronous PPP over an IrDA socket.
   3  *
   4  *              Jean II - HPL `00 - <jt@hpl.hp.com>
   5  *
   6  * This file contains definitions and declarations global to the IrNET module,
   7  * all grouped in one place...
   8  * This file is a *private* header, so other modules don't want to know
   9  * what's in there...
  10  *
  11  * Note : as most part of the Linux kernel, this module is available
  12  * under the GNU General Public License (GPL).
  13  */
  14
  15 #ifndef IRNET_H
  16 #define IRNET_H
  17
  18 /************************** DOCUMENTATION ***************************/
  19 /*
  20  * What is IrNET
  21  * -------------
  22  * IrNET is a protocol allowing to carry TCP/IP traffic between two
  23  * IrDA peers in an efficient fashion. It is a thin layer, passing PPP
  24  * packets to IrTTP and vice versa. It uses PPP in synchronous mode,
  25  * because IrTTP offer a reliable sequenced packet service (as opposed
  26  * to a byte stream). In fact, you could see IrNET as carrying TCP/IP
  27  * in a IrDA socket, using PPP to provide the glue.
  28  *
  29  * The main difference with traditional PPP over IrCOMM is that we
  30  * avoid the framing and serial emulation which are a performance
  31  * bottleneck. It also allows multipoint communications in a sensible
  32  * fashion.
  33  *
  34  * The main difference with IrLAN is that we use PPP for the link
  35  * management, which is more standard, interoperable and flexible than
  36  * the IrLAN protocol. For example, PPP adds authentication,
  37  * encryption, compression, header compression and automated routing
  38  * setup. And, as IrNET let PPP do the hard work, the implementation
  39  * is much simpler than IrLAN.
  40  *
  41  * The Linux implementation
  42  * ------------------------
  43  * IrNET is written on top of the Linux-IrDA stack, and interface with
  44  * the generic Linux PPP driver. Because IrNET depend on recent
  45  * changes of the PPP driver interface, IrNET will work only with very
  46  * recent kernel (2.3.99-pre6 and up).
  47  *
  48  * The present implementation offer the following features :
  49  *      o simple user interface using pppd
  50  *      o efficient implementation (interface directly to PPP and IrTTP)
  51  *      o addressing (you can specify the name of the IrNET recipient)
  52  *      o multipoint operation (limited by IrLAP specification)
  53  *      o information in /proc/net/irda/irnet
  54  *      o IrNET events on /dev/irnet (for user space daemon)
  55  *      o IrNET daemon (irnetd) to automatically handle incoming requests
  56  *      o Windows 2000 compatibility (tested, but need more work)
  57  * Currently missing :
  58  *      o Lot's of testing (that's your job)
  59  *      o Connection retries (may be too hard to do)
  60  *      o Check pppd persist mode
  61  *      o User space daemon (to automatically handle incoming requests)
  62  *
  63  * The setup is not currently the most easy, but this should get much
  64  * better when everything will get integrated...
  65  *
  66  * Acknowledgements
  67  * ----------------
  68  * This module is based on :
  69  *      o The PPP driver (ppp_synctty/ppp_generic) by Paul Mackerras
  70  *      o The IrLAN protocol (irlan_common/XXX) by Dag Brattli
  71  *      o The IrSock interface (af_irda) by Dag Brattli
  72  *      o Some other bits from the kernel and my drivers...
  73  * Infinite thanks to those brave souls for providing the infrastructure
  74  * upon which IrNET is built.
  75  *
  76  * Thanks to all my collegues in HP for helping me. In particular,
  77  * thanks to Salil Pradhan and Bill Serra for W2k testing...
  78  * Thanks to Luiz Magalhaes for irnetd and much testing...
  79  *
  80  * Thanks to Alan Cox for answering lot's of my stupid questions, and
  81  * to Paul Mackerras answering my questions on how to best integrate
  82  * IrNET and pppd.
  83  *
  84  * Jean II
  85  *
  86  * Note on some implementations choices...
  87  * ------------------------------------
  88  *      1) Direct interface vs tty/socket
  89  * I could have used a tty interface to hook to ppp and use the full
  90  * socket API to connect to IrDA. The code would have been easier to
  91  * maintain, and maybe the code would have been smaller...
  92  * Instead, we hook directly to ppp_generic and to IrTTP, which make
  93  * things more complicated...
  94  *
  95  * The first reason is flexibility : this allow us to create IrNET
  96  * instances on demand (no /dev/ircommX crap) and to allow linkname
  97  * specification on pppd command line...
  98  *
  99  * Second reason is speed optimisation. If you look closely at the
 100  * transmit and receive paths, you will notice that they are "super lean"
 101  * (that's why they look ugly), with no function calls and as little data
 102  * copy and modification as I could...
 103  *
 104  *      2) irnetd in user space
 105  * irnetd is implemented in user space, which is necessary to call pppd.
 106  * This also give maximum benefits in term of flexibility and customability,
 107  * and allow to offer the event channel, useful for other stuff like debug.
 108  *
 109  * On the other hand, this require a loose coordination between the
 110  * present module and irnetd. One critical area is how incoming request
 111  * are handled.
 112  * When irnet receive an incoming request, it send an event to irnetd and
 113  * drop the incoming IrNET socket.
 114  * irnetd start a pppd instance, which create a new IrNET socket. This new
 115  * socket is then connected in the originating node to the pppd instance.
 116  * At this point, in the originating node, the first socket is closed.
 117  *
 118  * I admit, this is a bit messy and waste some resources. The alternative
 119  * is caching incoming socket, and that's also quite messy and waste
 120  * resources.
 121  * We also make connection time slower. For example, on a 115 kb/s link it
 122  * adds 60ms to the connection time (770 ms). However, this is slower than
 123  * the time it takes to fire up pppd on my P133...
 124  *
 125  *
 126  * History :
 127  * -------
 128  *
 129  * v1 - 15.5.00 - Jean II
 130  *      o Basic IrNET (hook to ppp_generic & IrTTP - incl. multipoint)
 131  *      o control channel on /dev/irnet (set name/address)
 132  *      o event channel on /dev/irnet (for user space daemon)
 133  *
 134  * v2 - 5.6.00 - Jean II
 135  *      o Enable DROP_NOT_READY to avoid PPP timeouts & other weirdness...
 136  *      o Add DISCONNECT_TO event and rename DISCONNECT_FROM.
 137  *      o Set official device number alloaction on /dev/irnet
 138  *
 139  * v3 - 30.8.00 - Jean II
 140  *      o Update to latest Linux-IrDA changes :
 141  *              - queue_t => irda_queue_t
 142  *      o Update to ppp-2.4.0 :
 143  *              - move irda_irnet_connect from PPPIOCATTACH to TIOCSETD
 144  *      o Add EXPIRE event (depend on new IrDA-Linux patch)
 145  *      o Switch from `hashbin_remove' to `hashbin_remove_this' to fix
 146  *        a multilink bug... (depend on new IrDA-Linux patch)
 147  *      o fix a self->daddr to self->raddr in irda_irnet_connect to fix
 148  *        another multilink bug (darn !)
 149  *      o Remove LINKNAME_IOCTL cruft
 150  *
 151  * v3b - 31.8.00 - Jean II
 152  *      o Dump discovery log at event channel startup
 153  *
 154  * v4 - 28.9.00 - Jean II
 155  *      o Fix interaction between poll/select and dump discovery log
 156  *      o Add IRNET_BLOCKED_LINK event (depend on new IrDA-Linux patch)
 157  *      o Add IRNET_NOANSWER_FROM event (mostly to help support)
 158  *      o Release flow control in disconnect_indication
 159  *      o Block packets while connecting (speed up connections)
 160  *
 161  * v5 - 11.01.01 - Jean II
 162  *      o Init self->max_header_size, just in case...
 163  *      o Set up ap->chan.hdrlen, to get zero copy on tx side working.
 164  *      o avoid tx->ttp->flow->ppp->tx->... loop, by checking flow state
 165  *              Thanks to Christian Gennerat for finding this bug !
 166  *      ---
 167  *      o Declare the proper MTU/MRU that we can support
 168  *              (but PPP doesn't read the MTU value :-()
 169  *      o Declare hashbin HB_NOLOCK instead of HB_LOCAL to avoid
 170  *              disabling and enabling irq twice
 171  *
 172  * v6 - 31.05.01 - Jean II
 173  *      o Print source address in Found, Discovery, Expiry & Request events
 174  *      o Print requested source address in /proc/net/irnet
 175  *      o Change control channel input. Allow multiple commands in one line.
 176  *      o Add saddr command to change ap->rsaddr (and use that in IrDA)
 177  *      ---
 178  *      o Make the IrDA connection procedure totally asynchronous.
 179  *        Heavy rewrite of the IAS query code and the whole connection
 180  *        procedure. Now, irnet_connect() no longer need to be called from
 181  *        a process context...
 182  *      o Enable IrDA connect retries in ppp_irnet_send(). The good thing
 183  *        is that IrDA connect retries are directly driven by PPP LCP
 184  *        retries (we retry for each LCP packet), so that everything
 185  *        is transparently controlled from pppd lcp-max-configure.
 186  *      o Add ttp_connect flag to prevent rentry on the connect procedure
 187  *      o Test and fixups to eliminate side effects of retries
 188  *
 189  * v7 - 22.08.01 - Jean II
 190  *      o Cleanup : Change "saddr = 0x0" to "saddr = DEV_ADDR_ANY"
 191  *      o Fix bug in BLOCK_WHEN_CONNECT introduced in v6 : due to the
 192  *        asynchronous IAS query, self->tsap is NULL when PPP send the
 193  *        first packet.  This was preventing "connect-delay 0" to work.
 194  *        Change the test in ppp_irnet_send() to self->ttp_connect.
 195  *
 196  * v8 - 1.11.01 - Jean II
 197  *      o Tighten the use of self->ttp_connect and self->ttp_open to
 198  *        prevent various race conditions.
 199  *      o Avoid leaking discovery log and skb
 200  *      o Replace "self" with "server" in irnet_connect_indication() to
 201  *        better detect cut'n'paste error ;-)
 202  *
 203  * v9 - 29.11.01 - Jean II
 204  *      o Fix event generation in disconnect indication that I broke in v8
 205  *        It was always generation "No-Answer" because I was testing ttp_open
 206  *        just after clearing it. *blush*.
 207  *      o Use newly created irttp_listen() to fix potential crash when LAP
 208  *        destroyed before irnet module removed.
 209  *
 210  * v10 - 4.3.2 - Jean II
 211  *      o When receiving a disconnect indication, don't reenable the
 212  *        PPP Tx queue, this will trigger a reconnect. Instead, close
 213  *        the channel, which will kill pppd...
 214  *
 215  * v11 - 20.3.02 - Jean II
 216  *      o Oops ! v10 fix disabled IrNET retries and passive behaviour.
 217  *        Better fix in irnet_disconnect_indication() :
 218  *        - if connected, kill pppd via hangup.
 219  *        - if not connected, reenable ppp Tx, which trigger IrNET retry.
 220  *
 221  * v12 - 10.4.02 - Jean II
 222  *      o Fix race condition in irnet_connect_indication().
 223  *        If the socket was already trying to connect, drop old connection
 224  *        and use new one only if acting as primary. See comments.
 225  *
 226  * v13 - 30.5.02 - Jean II
 227  *      o Update module init code
 228  *
 229  * v14 - 20.2.03 - Jean II
 230  *      o Add discovery hint bits in the control channel.
 231  *      o Remove obsolete MOD_INC/DEC_USE_COUNT in favor of .owner
 232  *
 233  * v15 - 7.4.03 - Jean II
 234  *      o Replace spin_lock_irqsave() with spin_lock_bh() so that we can
 235  *        use ppp_unit_number(). It's probably also better overall...
 236  *      o Disable call to ppp_unregister_channel(), because we can't do it.
 237  */
 238
 239 /***************************** INCLUDES *****************************/
 240
 241 #include <linux/module.h>
 242
 243 #include <linux/kernel.h>
 244 #include <linux/skbuff.h>
 245 #include <linux/tty.h>
 246 #include <linux/proc_fs.h>
 247 #include <linux/netdevice.h>
 248 #include <linux/miscdevice.h>
 249 #include <linux/poll.h>
 250 #include <linux/capability.h>
 251 #include <linux/ctype.h>        /* isspace() */
 252 #include <asm/uaccess.h>
 253 #include <linux/init.h>
 254
 255 #include <linux/ppp_defs.h>
 256 #include <linux/if_ppp.h>
 257 #include <linux/ppp_channel.h>
 258
 259 #include <net/irda/irda.h>
 260 #include <net/irda/iriap.h>
 261 #include <net/irda/irias_object.h>
 262 #include <net/irda/irlmp.h>
 263 #include <net/irda/irttp.h>
 264 #include <net/irda/discovery.h>
 265
 266 /***************************** OPTIONS *****************************/
 267 /*
 268  * Define or undefine to compile or not some optional part of the
 269  * IrNET driver...
 270  * Note : the present defaults make sense, play with that at your
 271  * own risk...
 272  */
 273 /* IrDA side of the business... */
 274 #define DISCOVERY_NOMASK        /* To enable W2k compatibility... */
 275 #define ADVERTISE_HINT          /* Advertise IrLAN hint bit */
 276 #define ALLOW_SIMULT_CONNECT    /* This seem to work, cross fingers... */
 277 #define DISCOVERY_EVENTS        /* Query the discovery log to post events */
 278 #define INITIAL_DISCOVERY       /* Dump current discovery log as events */
 279 #undef STREAM_COMPAT            /* Not needed - potentially messy */
 280 #undef CONNECT_INDIC_KICK       /* Might mess IrDA, not needed */
 281 #undef FAIL_SEND_DISCONNECT     /* Might mess IrDA, not needed */
 282 #undef PASS_CONNECT_PACKETS     /* Not needed ? Safe */
 283 #undef MISSING_PPP_API          /* Stuff I wish I could do */
 284
 285 /* PPP side of the business */
 286 #define BLOCK_WHEN_CONNECT      /* Block packets when connecting */
 287 #define CONNECT_IN_SEND         /* Retry IrDA connection procedure */
 288 #undef FLUSH_TO_PPP             /* Not sure about this one, let's play safe */
 289 #undef SECURE_DEVIRNET          /* Bah... */
 290
 291 /****************************** DEBUG ******************************/
 292
 293 /*
 294  * This set of flags enable and disable all the various warning,
 295  * error and debug message of this driver.
 296  * Each section can be enabled and disabled independently
 297  */
 298 /* In the PPP part */
 299 #define DEBUG_CTRL_TRACE        0       /* Control channel */
 300 #define DEBUG_CTRL_INFO         0       /* various info */
 301 #define DEBUG_CTRL_ERROR        1       /* problems */
 302 #define DEBUG_FS_TRACE          0       /* filesystem callbacks */
 303 #define DEBUG_FS_INFO           0       /* various info */
 304 #define DEBUG_FS_ERROR          1       /* problems */
 305 #define DEBUG_PPP_TRACE         0       /* PPP related functions */
 306 #define DEBUG_PPP_INFO          0       /* various info */
 307 #define DEBUG_PPP_ERROR         1       /* problems */
 308 #define DEBUG_MODULE_TRACE      0       /* module insertion/removal */
 309 #define DEBUG_MODULE_ERROR      1       /* problems */
 310
 311 /* In the IrDA part */
 312 #define DEBUG_IRDA_SR_TRACE     0       /* IRDA subroutines */
 313 #define DEBUG_IRDA_SR_INFO      0       /* various info */
 314 #define DEBUG_IRDA_SR_ERROR     1       /* problems */
 315 #define DEBUG_IRDA_SOCK_TRACE   0       /* IRDA main socket functions */
 316 #define DEBUG_IRDA_SOCK_INFO    0       /* various info */
 317 #define DEBUG_IRDA_SOCK_ERROR   1       /* problems */
 318 #define DEBUG_IRDA_SERV_TRACE   0       /* The IrNET server */
 319 #define DEBUG_IRDA_SERV_INFO    0       /* various info */
 320 #define DEBUG_IRDA_SERV_ERROR   1       /* problems */
 321 #define DEBUG_IRDA_TCB_TRACE    0       /* IRDA IrTTP callbacks */
 322 #define DEBUG_IRDA_CB_INFO      0       /* various info */
 323 #define DEBUG_IRDA_CB_ERROR     1       /* problems */
 324 #define DEBUG_IRDA_OCB_TRACE    0       /* IRDA other callbacks */
 325 #define DEBUG_IRDA_OCB_INFO     0       /* various info */
 326 #define DEBUG_IRDA_OCB_ERROR    1       /* problems */
 327
 328 #define DEBUG_ASSERT            0       /* Verify all assertions */
 329
 330 /*
 331  * These are the macros we are using to actually print the debug
 332  * statements. Don't look at it, it's ugly...
 333  *
 334  * One of the trick is that, as the DEBUG_XXX are constant, the
 335  * compiler will optimise away the if() in all cases.
 336  */
 337 /* All error messages (will show up in the normal logs) */
 338 #define DERROR(dbg, format, args...) \
 339         {if(DEBUG_##dbg) \
 340                 printk(KERN_INFO "irnet: %s(): " format, __func__ , ##args);}
 341
 342 /* Normal debug message (will show up in /var/log/debug) */
 343 #define DEBUG(dbg, format, args...) \
 344         {if(DEBUG_##dbg) \
 345                 printk(KERN_DEBUG "irnet: %s(): " format, __func__ , ##args);}
 346
 347 /* Entering a function (trace) */
 348 #define DENTER(dbg, format, args...) \
 349         {if(DEBUG_##dbg) \
 350                 printk(KERN_DEBUG "irnet: -> %s" format, __func__ , ##args);}
 351
 352 /* Entering and exiting a function in one go (trace) */
 353 #define DPASS(dbg, format, args...) \
 354         {if(DEBUG_##dbg) \
 355                 printk(KERN_DEBUG "irnet: <>%s" format, __func__ , ##args);}
 356
 357 /* Exiting a function (trace) */
 358 #define DEXIT(dbg, format, args...) \
 359         {if(DEBUG_##dbg) \
 360                 printk(KERN_DEBUG "irnet: <-%s()" format, __func__ , ##args);}
 361
 362 /* Exit a function with debug */
 363 #define DRETURN(ret, dbg, args...) \
 364         {DEXIT(dbg, ": " args);\
 365         return ret; }
 366
 367 /* Exit a function on failed condition */
 368 #define DABORT(cond, ret, dbg, args...) \
 369         {if(cond) {\
 370                 DERROR(dbg, args);\
 371                 return ret; }}
 372
 373 /* Invalid assertion, print out an error and exit... */
 374 #define DASSERT(cond, ret, dbg, args...) \
 375         {if((DEBUG_ASSERT) && !(cond)) {\
 376                 DERROR(dbg, "Invalid assertion: " args);\
 377                 return ret; }}
 378
 379 /************************ CONSTANTS & MACROS ************************/
 380
 381 /* Paranoia */
 382 #define IRNET_MAGIC     0xB00754
 383
 384 /* Number of control events in the control channel buffer... */
 385 #define IRNET_MAX_EVENTS        8       /* Should be more than enough... */
 386
 387 /****************************** TYPES ******************************/
 388
 389 /*
 390  * This is the main structure where we store all the data pertaining to
 391  * one instance of irnet.
 392  * Note : in irnet functions, a pointer this structure is usually called
 393  * "ap" or "self". If the code is borrowed from the IrDA stack, it tend
 394  * to be called "self", and if it is borrowed from the PPP driver it is
 395  * "ap". Apart from that, it's exactly the same structure ;-)
 396  */
 397 typedef struct irnet_socket
 398 {
 399   /* ------------------- Instance management ------------------- */
 400   /* We manage a linked list of IrNET socket instances */
 401   irda_queue_t          q;              /* Must be first - for hasbin */
 402   int                   magic;          /* Paranoia */
 403
 404   /* --------------------- FileSystem part --------------------- */
 405   /* "pppd" interact directly with us on a /dev/ file */
 406   struct file *         file;           /* File descriptor of this instance */
 407   /* TTY stuff - to keep "pppd" happy */
 408   struct ktermios       termios;        /* Various tty flags */
 409   /* Stuff for the control channel */
 410   int                   event_index;    /* Last read in the event log */
 411
 412   /* ------------------------- PPP part ------------------------- */
 413   /* We interface directly to the ppp_generic driver in the kernel */
 414   int                   ppp_open;       /* registered with ppp_generic */
 415   struct ppp_channel    chan;           /* Interface to generic ppp layer */
 416
 417   int                   mru;            /* Max size of PPP payload */
 418   u32                   xaccm[8];       /* Asynchronous character map (just */
 419   u32                   raccm;          /* to please pppd - dummy) */
 420   unsigned int          flags;          /* PPP flags (compression, ...) */
 421   unsigned int          rbits;          /* Unused receive flags ??? */
 422   struct work_struct disconnect_work;   /* Process context disconnection */
 423   /* ------------------------ IrTTP part ------------------------ */
 424   /* We create a pseudo "socket" over the IrDA tranport */
 425   unsigned long         ttp_open;       /* Set when IrTTP is ready */
 426   unsigned long         ttp_connect;    /* Set when IrTTP is connecting */
 427   struct tsap_cb *      tsap;           /* IrTTP instance (the connection) */
 428
 429   char                  rname[NICKNAME_MAX_LEN + 1];
 430                                         /* IrDA nickname of destination */
 431   __u32                 rdaddr;         /* Requested peer IrDA address */
 432   __u32                 rsaddr;         /* Requested local IrDA address */
 433   __u32                 daddr;          /* actual peer IrDA address */
 434   __u32                 saddr;          /* my local IrDA address */
 435   __u8                  dtsap_sel;      /* Remote TSAP selector */
 436   __u8                  stsap_sel;      /* Local TSAP selector */
 437
 438   __u32                 max_sdu_size_rx;/* Socket parameters used for IrTTP */
 439   __u32                 max_sdu_size_tx;
 440   __u32                 max_data_size;
 441   __u8                  max_header_size;
 442   LOCAL_FLOW            tx_flow;        /* State of the Tx path in IrTTP */
 443
 444   /* ------------------- IrLMP and IrIAS part ------------------- */
 445   /* Used for IrDA Discovery and socket name resolution */
 446   void *                ckey;           /* IrLMP client handle */
 447   __u16                 mask;           /* Hint bits mask (filter discov.)*/
 448   int                   nslots;         /* Number of slots for discovery */
 449
 450   struct iriap_cb *     iriap;          /* Used to query remote IAS */
 451   int                   errno;          /* status of the IAS query */
 452
 453   /* -------------------- Discovery log part -------------------- */
 454   /* Used by initial discovery on the control channel
 455    * and by irnet_discover_daddr_and_lsap_sel() */
 456   struct irda_device_info *discoveries; /* Copy of the discovery log */
 457   int                   disco_index;    /* Last read in the discovery log */
 458   int                   disco_number;   /* Size of the discovery log */
 459
 460 } irnet_socket;
 461
 462 /*
 463  * This is the various event that we will generate on the control channel
 464  */
 465 typedef enum irnet_event
 466 {
 467   IRNET_DISCOVER,               /* New IrNET node discovered */
 468   IRNET_EXPIRE,                 /* IrNET node expired */
 469   IRNET_CONNECT_TO,             /* IrNET socket has connected to other node */
 470   IRNET_CONNECT_FROM,           /* Other node has connected to IrNET socket */
 471   IRNET_REQUEST_FROM,           /* Non satisfied connection request */
 472   IRNET_NOANSWER_FROM,          /* Failed connection request */
 473   IRNET_BLOCKED_LINK,           /* Link (IrLAP) is blocked for > 3s */
 474   IRNET_DISCONNECT_FROM,        /* IrNET socket has disconnected */
 475   IRNET_DISCONNECT_TO           /* Closing IrNET socket */
 476 } irnet_event;
 477
 478 /*
 479  * This is the storage for an event and its arguments
 480  */
 481 typedef struct irnet_log
 482 {
 483   irnet_event   event;
 484   int           unit;
 485   __u32         saddr;
 486   __u32         daddr;
 487   char          name[NICKNAME_MAX_LEN + 1];     /* 21 + 1 */
 488   __u16_host_order hints;                       /* Discovery hint bits */
 489 } irnet_log;
 490
 491 /*
 492  * This is the storage for all events and related stuff...
 493  */
 494 typedef struct irnet_ctrl_channel
 495 {
 496   irnet_log     log[IRNET_MAX_EVENTS];  /* Event log */
 497   int           index;          /* Current index in log */
 498   spinlock_t    spinlock;       /* Serialize access to the event log */
 499   wait_queue_head_t     rwait;  /* processes blocked on read (or poll) */
 500 } irnet_ctrl_channel;
 501
 502 /**************************** PROTOTYPES ****************************/
 503 /*
 504  * Global functions of the IrNET module
 505  * Note : we list here also functions called from one file to the other.
 506  */
 507
 508 /* -------------------------- IRDA PART -------------------------- */
 509 extern int
 510         irda_irnet_create(irnet_socket *);      /* Initialise a IrNET socket */
 511 extern int
 512         irda_irnet_connect(irnet_socket *);     /* Try to connect over IrDA */
 513 extern void
 514         irda_irnet_destroy(irnet_socket *);     /* Teardown  a IrNET socket */
 515 extern int
 516         irda_irnet_init(void);          /* Initialise IrDA part of IrNET */
 517 extern void
 518         irda_irnet_cleanup(void);       /* Teardown IrDA part of IrNET */
 519
 520 /**************************** VARIABLES ****************************/
 521
 522 /* Control channel stuff - allocated in irnet_irda.h */
 523 extern struct irnet_ctrl_channel        irnet_events;
 524
 525 #endif /* IRNET_H */