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TOMOYO Linux Cross Reference
Linux/net/irda/irnet/irnet_irda.c

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  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 implement the IRDA interface of IrNET.
  7  * Basically, we sit on top of IrTTP. We set up IrTTP, IrIAS properly,
  8  * and exchange frames with IrTTP.
  9  */
 10 
 11 #include "irnet_irda.h"         /* Private header */
 12 #include <linux/sched.h>
 13 #include <linux/seq_file.h>
 14 #include <linux/slab.h>
 15 #include <asm/unaligned.h>
 16 
 17 /*
 18  * PPP disconnect work: we need to make sure we're in
 19  * process context when calling ppp_unregister_channel().
 20  */
 21 static void irnet_ppp_disconnect(struct work_struct *work)
 22 {
 23         irnet_socket * self =
 24                 container_of(work, irnet_socket, disconnect_work);
 25 
 26         if (self == NULL)
 27                 return;
 28         /*
 29          * If we were connected, cleanup & close the PPP
 30          * channel, which will kill pppd (hangup) and the rest.
 31          */
 32         if (self->ppp_open && !self->ttp_open && !self->ttp_connect) {
 33                 ppp_unregister_channel(&self->chan);
 34                 self->ppp_open = 0;
 35         }
 36 }
 37 
 38 /************************* CONTROL CHANNEL *************************/
 39 /*
 40  * When ppp is not active, /dev/irnet act as a control channel.
 41  * Writing allow to set up the IrDA destination of the IrNET channel,
 42  * and any application may be read events happening on IrNET...
 43  */
 44 
 45 /*------------------------------------------------------------------*/
 46 /*
 47  * Post an event to the control channel...
 48  * Put the event in the log, and then wait all process blocked on read
 49  * so they can read the log...
 50  */
 51 static void
 52 irnet_post_event(irnet_socket * ap,
 53                  irnet_event    event,
 54                  __u32          saddr,
 55                  __u32          daddr,
 56                  char *         name,
 57                  __u16          hints)
 58 {
 59   int                   index;          /* In the log */
 60 
 61   DENTER(CTRL_TRACE, "(ap=0x%p, event=%d, daddr=%08x, name=``%s'')\n",
 62          ap, event, daddr, name);
 63 
 64   /* Protect this section via spinlock.
 65    * Note : as we are the only event producer, we only need to exclude
 66    * ourself when touching the log, which is nice and easy.
 67    */
 68   spin_lock_bh(&irnet_events.spinlock);
 69 
 70   /* Copy the event in the log */
 71   index = irnet_events.index;
 72   irnet_events.log[index].event = event;
 73   irnet_events.log[index].daddr = daddr;
 74   irnet_events.log[index].saddr = saddr;
 75   /* Try to copy IrDA nickname */
 76   if(name)
 77     strcpy(irnet_events.log[index].name, name);
 78   else
 79     irnet_events.log[index].name[0] = '\0';
 80   /* Copy hints */
 81   irnet_events.log[index].hints.word = hints;
 82   /* Try to get ppp unit number */
 83   if((ap != (irnet_socket *) NULL) && (ap->ppp_open))
 84     irnet_events.log[index].unit = ppp_unit_number(&ap->chan);
 85   else
 86     irnet_events.log[index].unit = -1;
 87 
 88   /* Increment the index
 89    * Note that we increment the index only after the event is written,
 90    * to make sure that the readers don't get garbage... */
 91   irnet_events.index = (index + 1) % IRNET_MAX_EVENTS;
 92 
 93   DEBUG(CTRL_INFO, "New event index is %d\n", irnet_events.index);
 94 
 95   /* Spin lock end */
 96   spin_unlock_bh(&irnet_events.spinlock);
 97 
 98   /* Now : wake up everybody waiting for events... */
 99   wake_up_interruptible_all(&irnet_events.rwait);
100 
101   DEXIT(CTRL_TRACE, "\n");
102 }
103 
104 /************************* IRDA SUBROUTINES *************************/
105 /*
106  * These are a bunch of subroutines called from other functions
107  * down there, mostly common code or to improve readability...
108  *
109  * Note : we duplicate quite heavily some routines of af_irda.c,
110  * because our input structure (self) is quite different
111  * (struct irnet instead of struct irda_sock), which make sharing
112  * the same code impossible (at least, without templates).
113  */
114 
115 /*------------------------------------------------------------------*/
116 /*
117  * Function irda_open_tsap (self)
118  *
119  *    Open local Transport Service Access Point (TSAP)
120  *
121  * Create a IrTTP instance for us and set all the IrTTP callbacks.
122  */
123 static inline int
124 irnet_open_tsap(irnet_socket *  self)
125 {
126   notify_t      notify;         /* Callback structure */
127 
128   DENTER(IRDA_SR_TRACE, "(self=0x%p)\n", self);
129 
130   DABORT(self->tsap != NULL, -EBUSY, IRDA_SR_ERROR, "Already busy !\n");
131 
132   /* Initialize IrTTP callbacks to be used by the IrDA stack */
133   irda_notify_init(&notify);
134   notify.connect_confirm        = irnet_connect_confirm;
135   notify.connect_indication     = irnet_connect_indication;
136   notify.disconnect_indication  = irnet_disconnect_indication;
137   notify.data_indication        = irnet_data_indication;
138   /*notify.udata_indication     = NULL;*/
139   notify.flow_indication        = irnet_flow_indication;
140   notify.status_indication      = irnet_status_indication;
141   notify.instance               = self;
142   strlcpy(notify.name, IRNET_NOTIFY_NAME, sizeof(notify.name));
143 
144   /* Open an IrTTP instance */
145   self->tsap = irttp_open_tsap(LSAP_ANY, DEFAULT_INITIAL_CREDIT,
146                                &notify);
147   DABORT(self->tsap == NULL, -ENOMEM,
148          IRDA_SR_ERROR, "Unable to allocate TSAP !\n");
149 
150   /* Remember which TSAP selector we actually got */
151   self->stsap_sel = self->tsap->stsap_sel;
152 
153   DEXIT(IRDA_SR_TRACE, " - tsap=0x%p, sel=0x%X\n",
154         self->tsap, self->stsap_sel);
155   return 0;
156 }
157 
158 /*------------------------------------------------------------------*/
159 /*
160  * Function irnet_ias_to_tsap (self, result, value)
161  *
162  *    Examine an IAS object and extract TSAP
163  *
164  * We do an IAP query to find the TSAP associated with the IrNET service.
165  * When IrIAP pass us the result of the query, this function look at
166  * the return values to check for failures and extract the TSAP if
167  * possible.
168  * Also deallocate value
169  * The failure is in self->errno
170  * Return TSAP or -1
171  */
172 static inline __u8
173 irnet_ias_to_tsap(irnet_socket *        self,
174                   int                   result,
175                   struct ias_value *    value)
176 {
177   __u8  dtsap_sel = 0;          /* TSAP we are looking for */
178 
179   DENTER(IRDA_SR_TRACE, "(self=0x%p)\n", self);
180 
181   /* By default, no error */
182   self->errno = 0;
183 
184   /* Check if request succeeded */
185   switch(result)
186     {
187       /* Standard errors : service not available */
188     case IAS_CLASS_UNKNOWN:
189     case IAS_ATTRIB_UNKNOWN:
190       DEBUG(IRDA_SR_INFO, "IAS object doesn't exist ! (%d)\n", result);
191       self->errno = -EADDRNOTAVAIL;
192       break;
193 
194       /* Other errors, most likely IrDA stack failure */
195     default :
196       DEBUG(IRDA_SR_INFO, "IAS query failed ! (%d)\n", result);
197       self->errno = -EHOSTUNREACH;
198       break;
199 
200       /* Success : we got what we wanted */
201     case IAS_SUCCESS:
202       break;
203     }
204 
205   /* Check what was returned to us */
206   if(value != NULL)
207     {
208       /* What type of argument have we got ? */
209       switch(value->type)
210         {
211         case IAS_INTEGER:
212           DEBUG(IRDA_SR_INFO, "result=%d\n", value->t.integer);
213           if(value->t.integer != -1)
214             /* Get the remote TSAP selector */
215             dtsap_sel = value->t.integer;
216           else
217             self->errno = -EADDRNOTAVAIL;
218           break;
219         default:
220           self->errno = -EADDRNOTAVAIL;
221           DERROR(IRDA_SR_ERROR, "bad type ! (0x%X)\n", value->type);
222           break;
223         }
224 
225       /* Cleanup */
226       irias_delete_value(value);
227     }
228   else  /* value == NULL */
229     {
230       /* Nothing returned to us - usually result != SUCCESS */
231       if(!(self->errno))
232         {
233           DERROR(IRDA_SR_ERROR,
234                  "IrDA bug : result == SUCCESS && value == NULL\n");
235           self->errno = -EHOSTUNREACH;
236         }
237     }
238   DEXIT(IRDA_SR_TRACE, "\n");
239 
240   /* Return the TSAP */
241   return dtsap_sel;
242 }
243 
244 /*------------------------------------------------------------------*/
245 /*
246  * Function irnet_find_lsap_sel (self)
247  *
248  *    Try to lookup LSAP selector in remote LM-IAS
249  *
250  * Basically, we start a IAP query, and then go to sleep. When the query
251  * return, irnet_getvalue_confirm will wake us up, and we can examine the
252  * result of the query...
253  * Note that in some case, the query fail even before we go to sleep,
254  * creating some races...
255  */
256 static inline int
257 irnet_find_lsap_sel(irnet_socket *      self)
258 {
259   DENTER(IRDA_SR_TRACE, "(self=0x%p)\n", self);
260 
261   /* This should not happen */
262   DABORT(self->iriap, -EBUSY, IRDA_SR_ERROR, "busy with a previous query.\n");
263 
264   /* Create an IAP instance, will be closed in irnet_getvalue_confirm() */
265   self->iriap = iriap_open(LSAP_ANY, IAS_CLIENT, self,
266                            irnet_getvalue_confirm);
267 
268   /* Treat unexpected signals as disconnect */
269   self->errno = -EHOSTUNREACH;
270 
271   /* Query remote LM-IAS */
272   iriap_getvaluebyclass_request(self->iriap, self->rsaddr, self->daddr,
273                                 IRNET_SERVICE_NAME, IRNET_IAS_VALUE);
274 
275   /* The above request is non-blocking.
276    * After a while, IrDA will call us back in irnet_getvalue_confirm()
277    * We will then call irnet_ias_to_tsap() and finish the
278    * connection procedure */
279 
280   DEXIT(IRDA_SR_TRACE, "\n");
281   return 0;
282 }
283 
284 /*------------------------------------------------------------------*/
285 /*
286  * Function irnet_connect_tsap (self)
287  *
288  *    Initialise the TTP socket and initiate TTP connection
289  *
290  */
291 static inline int
292 irnet_connect_tsap(irnet_socket *       self)
293 {
294   int           err;
295 
296   DENTER(IRDA_SR_TRACE, "(self=0x%p)\n", self);
297 
298   /* Open a local TSAP (an IrTTP instance) */
299   err = irnet_open_tsap(self);
300   if(err != 0)
301     {
302       clear_bit(0, &self->ttp_connect);
303       DERROR(IRDA_SR_ERROR, "connect aborted!\n");
304       return err;
305     }
306 
307   /* Connect to remote device */
308   err = irttp_connect_request(self->tsap, self->dtsap_sel,
309                               self->rsaddr, self->daddr, NULL,
310                               self->max_sdu_size_rx, NULL);
311   if(err != 0)
312     {
313       clear_bit(0, &self->ttp_connect);
314       DERROR(IRDA_SR_ERROR, "connect aborted!\n");
315       return err;
316     }
317 
318   /* The above call is non-blocking.
319    * After a while, the IrDA stack will either call us back in
320    * irnet_connect_confirm() or irnet_disconnect_indication()
321    * See you there ;-) */
322 
323   DEXIT(IRDA_SR_TRACE, "\n");
324   return err;
325 }
326 
327 /*------------------------------------------------------------------*/
328 /*
329  * Function irnet_discover_next_daddr (self)
330  *
331  *    Query the IrNET TSAP of the next device in the log.
332  *
333  * Used in the TSAP discovery procedure.
334  */
335 static inline int
336 irnet_discover_next_daddr(irnet_socket *        self)
337 {
338   /* Close the last instance of IrIAP, and open a new one.
339    * We can't reuse the IrIAP instance in the IrIAP callback */
340   if(self->iriap)
341     {
342       iriap_close(self->iriap);
343       self->iriap = NULL;
344     }
345   /* Create a new IAP instance */
346   self->iriap = iriap_open(LSAP_ANY, IAS_CLIENT, self,
347                            irnet_discovervalue_confirm);
348   if(self->iriap == NULL)
349     return -ENOMEM;
350 
351   /* Next discovery - before the call to avoid races */
352   self->disco_index++;
353 
354   /* Check if we have one more address to try */
355   if(self->disco_index < self->disco_number)
356     {
357       /* Query remote LM-IAS */
358       iriap_getvaluebyclass_request(self->iriap,
359                                     self->discoveries[self->disco_index].saddr,
360                                     self->discoveries[self->disco_index].daddr,
361                                     IRNET_SERVICE_NAME, IRNET_IAS_VALUE);
362       /* The above request is non-blocking.
363        * After a while, IrDA will call us back in irnet_discovervalue_confirm()
364        * We will then call irnet_ias_to_tsap() and come back here again... */
365       return 0;
366     }
367   else
368     return 1;
369 }
370 
371 /*------------------------------------------------------------------*/
372 /*
373  * Function irnet_discover_daddr_and_lsap_sel (self)
374  *
375  *    This try to find a device with the requested service.
376  *
377  * Initiate a TSAP discovery procedure.
378  * It basically look into the discovery log. For each address in the list,
379  * it queries the LM-IAS of the device to find if this device offer
380  * the requested service.
381  * If there is more than one node supporting the service, we complain
382  * to the user (it should move devices around).
383  * If we find one node which have the requested TSAP, we connect to it.
384  *
385  * This function just start the whole procedure. It request the discovery
386  * log and submit the first IAS query.
387  * The bulk of the job is handled in irnet_discovervalue_confirm()
388  *
389  * Note : this procedure fails if there is more than one device in range
390  * on the same dongle, because IrLMP doesn't disconnect the LAP when the
391  * last LSAP is closed. Moreover, we would need to wait the LAP
392  * disconnection...
393  */
394 static inline int
395 irnet_discover_daddr_and_lsap_sel(irnet_socket *        self)
396 {
397   int   ret;
398 
399   DENTER(IRDA_SR_TRACE, "(self=0x%p)\n", self);
400 
401   /* Ask lmp for the current discovery log */
402   self->discoveries = irlmp_get_discoveries(&self->disco_number, self->mask,
403                                             DISCOVERY_DEFAULT_SLOTS);
404 
405   /* Check if the we got some results */
406   if(self->discoveries == NULL)
407     {
408       self->disco_number = -1;
409       clear_bit(0, &self->ttp_connect);
410       DRETURN(-ENETUNREACH, IRDA_SR_INFO, "No Cachelog...\n");
411     }
412   DEBUG(IRDA_SR_INFO, "Got the log (0x%p), size is %d\n",
413         self->discoveries, self->disco_number);
414 
415   /* Start with the first discovery */
416   self->disco_index = -1;
417   self->daddr = DEV_ADDR_ANY;
418 
419   /* This will fail if the log is empty - this is non-blocking */
420   ret = irnet_discover_next_daddr(self);
421   if(ret)
422     {
423       /* Close IAP */
424       if(self->iriap)
425         iriap_close(self->iriap);
426       self->iriap = NULL;
427 
428       /* Cleanup our copy of the discovery log */
429       kfree(self->discoveries);
430       self->discoveries = NULL;
431 
432       clear_bit(0, &self->ttp_connect);
433       DRETURN(-ENETUNREACH, IRDA_SR_INFO, "Cachelog empty...\n");
434     }
435 
436   /* Follow me in irnet_discovervalue_confirm() */
437 
438   DEXIT(IRDA_SR_TRACE, "\n");
439   return 0;
440 }
441 
442 /*------------------------------------------------------------------*/
443 /*
444  * Function irnet_dname_to_daddr (self)
445  *
446  *    Convert an IrDA nickname to a valid IrDA address
447  *
448  * It basically look into the discovery log until there is a match.
449  */
450 static inline int
451 irnet_dname_to_daddr(irnet_socket *     self)
452 {
453   struct irda_device_info *discoveries; /* Copy of the discovery log */
454   int   number;                 /* Number of nodes in the log */
455   int   i;
456 
457   DENTER(IRDA_SR_TRACE, "(self=0x%p)\n", self);
458 
459   /* Ask lmp for the current discovery log */
460   discoveries = irlmp_get_discoveries(&number, 0xffff,
461                                       DISCOVERY_DEFAULT_SLOTS);
462   /* Check if the we got some results */
463   if(discoveries == NULL)
464     DRETURN(-ENETUNREACH, IRDA_SR_INFO, "Cachelog empty...\n");
465 
466   /*
467    * Now, check all discovered devices (if any), and connect
468    * client only about the services that the client is
469    * interested in...
470    */
471   for(i = 0; i < number; i++)
472     {
473       /* Does the name match ? */
474       if(!strncmp(discoveries[i].info, self->rname, NICKNAME_MAX_LEN))
475         {
476           /* Yes !!! Get it.. */
477           self->daddr = discoveries[i].daddr;
478           DEBUG(IRDA_SR_INFO, "discovered device ``%s'' at address 0x%08x.\n",
479                 self->rname, self->daddr);
480           kfree(discoveries);
481           DEXIT(IRDA_SR_TRACE, "\n");
482           return 0;
483         }
484     }
485   /* No luck ! */
486   DEBUG(IRDA_SR_INFO, "cannot discover device ``%s'' !!!\n", self->rname);
487   kfree(discoveries);
488   return -EADDRNOTAVAIL;
489 }
490 
491 
492 /************************* SOCKET ROUTINES *************************/
493 /*
494  * This are the main operations on IrNET sockets, basically to create
495  * and destroy IrNET sockets. These are called from the PPP part...
496  */
497 
498 /*------------------------------------------------------------------*/
499 /*
500  * Create a IrNET instance : just initialise some parameters...
501  */
502 int
503 irda_irnet_create(irnet_socket *        self)
504 {
505   DENTER(IRDA_SOCK_TRACE, "(self=0x%p)\n", self);
506 
507   self->magic = IRNET_MAGIC;    /* Paranoia */
508 
509   self->ttp_open = 0;           /* Prevent higher layer from accessing IrTTP */
510   self->ttp_connect = 0;        /* Not connecting yet */
511   self->rname[0] = '\0';        /* May be set via control channel */
512   self->rdaddr = DEV_ADDR_ANY;  /* May be set via control channel */
513   self->rsaddr = DEV_ADDR_ANY;  /* May be set via control channel */
514   self->daddr = DEV_ADDR_ANY;   /* Until we get connected */
515   self->saddr = DEV_ADDR_ANY;   /* Until we get connected */
516   self->max_sdu_size_rx = TTP_SAR_UNBOUND;
517 
518   /* Register as a client with IrLMP */
519   self->ckey = irlmp_register_client(0, NULL, NULL, NULL);
520 #ifdef DISCOVERY_NOMASK
521   self->mask = 0xffff;          /* For W2k compatibility */
522 #else /* DISCOVERY_NOMASK */
523   self->mask = irlmp_service_to_hint(S_LAN);
524 #endif /* DISCOVERY_NOMASK */
525   self->tx_flow = FLOW_START;   /* Flow control from IrTTP */
526 
527   INIT_WORK(&self->disconnect_work, irnet_ppp_disconnect);
528 
529   DEXIT(IRDA_SOCK_TRACE, "\n");
530   return 0;
531 }
532 
533 /*------------------------------------------------------------------*/
534 /*
535  * Connect to the other side :
536  *      o convert device name to an address
537  *      o find the socket number (dlsap)
538  *      o Establish the connection
539  *
540  * Note : We no longer mimic af_irda. The IAS query for finding the TSAP
541  * is done asynchronously, like the TTP connection. This allow us to
542  * call this function from any context (not only process).
543  * The downside is that following what's happening in there is tricky
544  * because it involve various functions all over the place...
545  */
546 int
547 irda_irnet_connect(irnet_socket *       self)
548 {
549   int           err;
550 
551   DENTER(IRDA_SOCK_TRACE, "(self=0x%p)\n", self);
552 
553   /* Check if we are already trying to connect.
554    * Because irda_irnet_connect() can be called directly by pppd plus
555    * packet retries in ppp_generic and connect may take time, plus we may
556    * race with irnet_connect_indication(), we need to be careful there... */
557   if(test_and_set_bit(0, &self->ttp_connect))
558     DRETURN(-EBUSY, IRDA_SOCK_INFO, "Already connecting...\n");
559   if((self->iriap != NULL) || (self->tsap != NULL))
560     DERROR(IRDA_SOCK_ERROR, "Socket not cleaned up...\n");
561 
562   /* Insert ourselves in the hashbin so that the IrNET server can find us.
563    * Notes : 4th arg is string of 32 char max and must be null terminated
564    *         When 4th arg is used (string), 3rd arg isn't (int)
565    *         Can't re-insert (MUST remove first) so check for that... */
566   if((irnet_server.running) && (self->q.q_next == NULL))
567     {
568       spin_lock_bh(&irnet_server.spinlock);
569       hashbin_insert(irnet_server.list, (irda_queue_t *) self, 0, self->rname);
570       spin_unlock_bh(&irnet_server.spinlock);
571       DEBUG(IRDA_SOCK_INFO, "Inserted ``%s'' in hashbin...\n", self->rname);
572     }
573 
574   /* If we don't have anything (no address, no name) */
575   if((self->rdaddr == DEV_ADDR_ANY) && (self->rname[0] == '\0'))
576     {
577       /* Try to find a suitable address */
578       if((err = irnet_discover_daddr_and_lsap_sel(self)) != 0)
579         DRETURN(err, IRDA_SOCK_INFO, "auto-connect failed!\n");
580       /* In most cases, the call above is non-blocking */
581     }
582   else
583     {
584       /* If we have only the name (no address), try to get an address */
585       if(self->rdaddr == DEV_ADDR_ANY)
586         {
587           if((err = irnet_dname_to_daddr(self)) != 0)
588             DRETURN(err, IRDA_SOCK_INFO, "name connect failed!\n");
589         }
590       else
591         /* Use the requested destination address */
592         self->daddr = self->rdaddr;
593 
594       /* Query remote LM-IAS to find LSAP selector */
595       irnet_find_lsap_sel(self);
596       /* The above call is non blocking */
597     }
598 
599   /* At this point, we are waiting for the IrDA stack to call us back,
600    * or we have already failed.
601    * We will finish the connection procedure in irnet_connect_tsap().
602    */
603   DEXIT(IRDA_SOCK_TRACE, "\n");
604   return 0;
605 }
606 
607 /*------------------------------------------------------------------*/
608 /*
609  * Function irda_irnet_destroy(self)
610  *
611  *    Destroy irnet instance
612  *
613  * Note : this need to be called from a process context.
614  */
615 void
616 irda_irnet_destroy(irnet_socket *       self)
617 {
618   DENTER(IRDA_SOCK_TRACE, "(self=0x%p)\n", self);
619   if(self == NULL)
620     return;
621 
622   /* Remove ourselves from hashbin (if we are queued in hashbin)
623    * Note : `irnet_server.running' protect us from calls in hashbin_delete() */
624   if((irnet_server.running) && (self->q.q_next != NULL))
625     {
626       struct irnet_socket *     entry;
627       DEBUG(IRDA_SOCK_INFO, "Removing from hash..\n");
628       spin_lock_bh(&irnet_server.spinlock);
629       entry = hashbin_remove_this(irnet_server.list, (irda_queue_t *) self);
630       self->q.q_next = NULL;
631       spin_unlock_bh(&irnet_server.spinlock);
632       DASSERT(entry == self, , IRDA_SOCK_ERROR, "Can't remove from hash.\n");
633     }
634 
635   /* If we were connected, post a message */
636   if(test_bit(0, &self->ttp_open))
637     {
638       /* Note : as the disconnect comes from ppp_generic, the unit number
639        * doesn't exist anymore when we post the event, so we need to pass
640        * NULL as the first arg... */
641       irnet_post_event(NULL, IRNET_DISCONNECT_TO,
642                        self->saddr, self->daddr, self->rname, 0);
643     }
644 
645   /* Prevent various IrDA callbacks from messing up things
646    * Need to be first */
647   clear_bit(0, &self->ttp_connect);
648 
649   /* Prevent higher layer from accessing IrTTP */
650   clear_bit(0, &self->ttp_open);
651 
652   /* Unregister with IrLMP */
653   irlmp_unregister_client(self->ckey);
654 
655   /* Unregister with LM-IAS */
656   if(self->iriap)
657     {
658       iriap_close(self->iriap);
659       self->iriap = NULL;
660     }
661 
662   /* Cleanup eventual discoveries from connection attempt or control channel */
663   if(self->discoveries != NULL)
664     {
665       /* Cleanup our copy of the discovery log */
666       kfree(self->discoveries);
667       self->discoveries = NULL;
668     }
669 
670   /* Close our IrTTP connection */
671   if(self->tsap)
672     {
673       DEBUG(IRDA_SOCK_INFO, "Closing our TTP connection.\n");
674       irttp_disconnect_request(self->tsap, NULL, P_NORMAL);
675       irttp_close_tsap(self->tsap);
676       self->tsap = NULL;
677     }
678   self->stsap_sel = 0;
679 
680   DEXIT(IRDA_SOCK_TRACE, "\n");
681 }
682 
683 
684 /************************** SERVER SOCKET **************************/
685 /*
686  * The IrNET service is composed of one server socket and a variable
687  * number of regular IrNET sockets. The server socket is supposed to
688  * handle incoming connections and redirect them to one IrNET sockets.
689  * It's a superset of the regular IrNET socket, but has a very distinct
690  * behaviour...
691  */
692 
693 /*------------------------------------------------------------------*/
694 /*
695  * Function irnet_daddr_to_dname (self)
696  *
697  *    Convert an IrDA address to a IrDA nickname
698  *
699  * It basically look into the discovery log until there is a match.
700  */
701 static inline int
702 irnet_daddr_to_dname(irnet_socket *     self)
703 {
704   struct irda_device_info *discoveries; /* Copy of the discovery log */
705   int   number;                 /* Number of nodes in the log */
706   int   i;
707 
708   DENTER(IRDA_SERV_TRACE, "(self=0x%p)\n", self);
709 
710   /* Ask lmp for the current discovery log */
711   discoveries = irlmp_get_discoveries(&number, 0xffff,
712                                       DISCOVERY_DEFAULT_SLOTS);
713   /* Check if the we got some results */
714   if (discoveries == NULL)
715     DRETURN(-ENETUNREACH, IRDA_SERV_INFO, "Cachelog empty...\n");
716 
717   /* Now, check all discovered devices (if any) */
718   for(i = 0; i < number; i++)
719     {
720       /* Does the name match ? */
721       if(discoveries[i].daddr == self->daddr)
722         {
723           /* Yes !!! Get it.. */
724           strlcpy(self->rname, discoveries[i].info, sizeof(self->rname));
725           self->rname[sizeof(self->rname) - 1] = '\0';
726           DEBUG(IRDA_SERV_INFO, "Device 0x%08x is in fact ``%s''.\n",
727                 self->daddr, self->rname);
728           kfree(discoveries);
729           DEXIT(IRDA_SERV_TRACE, "\n");
730           return 0;
731         }
732     }
733   /* No luck ! */
734   DEXIT(IRDA_SERV_INFO, ": cannot discover device 0x%08x !!!\n", self->daddr);
735   kfree(discoveries);
736   return -EADDRNOTAVAIL;
737 }
738 
739 /*------------------------------------------------------------------*/
740 /*
741  * Function irda_find_socket (self)
742  *
743  *    Find the correct IrNET socket
744  *
745  * Look into the list of IrNET sockets and finds one with the right
746  * properties...
747  */
748 static inline irnet_socket *
749 irnet_find_socket(irnet_socket *        self)
750 {
751   irnet_socket *        new = (irnet_socket *) NULL;
752   int                   err;
753 
754   DENTER(IRDA_SERV_TRACE, "(self=0x%p)\n", self);
755 
756   /* Get the addresses of the requester */
757   self->daddr = irttp_get_daddr(self->tsap);
758   self->saddr = irttp_get_saddr(self->tsap);
759 
760   /* Try to get the IrDA nickname of the requester */
761   err = irnet_daddr_to_dname(self);
762 
763   /* Protect access to the instance list */
764   spin_lock_bh(&irnet_server.spinlock);
765 
766   /* So now, try to get an socket having specifically
767    * requested that nickname */
768   if(err == 0)
769     {
770       new = (irnet_socket *) hashbin_find(irnet_server.list,
771                                           0, self->rname);
772       if(new)
773         DEBUG(IRDA_SERV_INFO, "Socket 0x%p matches rname ``%s''.\n",
774               new, new->rname);
775     }
776 
777   /* If no name matches, try to find an socket by the destination address */
778   /* It can be either the requested destination address (set via the
779    * control channel), or the current destination address if the
780    * socket is in the middle of a connection request */
781   if(new == (irnet_socket *) NULL)
782     {
783       new = (irnet_socket *) hashbin_get_first(irnet_server.list);
784       while(new !=(irnet_socket *) NULL)
785         {
786           /* Does it have the same address ? */
787           if((new->rdaddr == self->daddr) || (new->daddr == self->daddr))
788             {
789               /* Yes !!! Get it.. */
790               DEBUG(IRDA_SERV_INFO, "Socket 0x%p matches daddr %#08x.\n",
791                     new, self->daddr);
792               break;
793             }
794           new = (irnet_socket *) hashbin_get_next(irnet_server.list);
795         }
796     }
797 
798   /* If we don't have any socket, get the first unconnected socket */
799   if(new == (irnet_socket *) NULL)
800     {
801       new = (irnet_socket *) hashbin_get_first(irnet_server.list);
802       while(new !=(irnet_socket *) NULL)
803         {
804           /* Is it available ? */
805           if(!(test_bit(0, &new->ttp_open)) && (new->rdaddr == DEV_ADDR_ANY) &&
806              (new->rname[0] == '\0') && (new->ppp_open))
807             {
808               /* Yes !!! Get it.. */
809               DEBUG(IRDA_SERV_INFO, "Socket 0x%p is free.\n",
810                     new);
811               break;
812             }
813           new = (irnet_socket *) hashbin_get_next(irnet_server.list);
814         }
815     }
816 
817   /* Spin lock end */
818   spin_unlock_bh(&irnet_server.spinlock);
819 
820   DEXIT(IRDA_SERV_TRACE, " - new = 0x%p\n", new);
821   return new;
822 }
823 
824 /*------------------------------------------------------------------*/
825 /*
826  * Function irda_connect_socket (self)
827  *
828  *    Connect an incoming connection to the socket
829  *
830  */
831 static inline int
832 irnet_connect_socket(irnet_socket *     server,
833                      irnet_socket *     new,
834                      struct qos_info *  qos,
835                      __u32              max_sdu_size,
836                      __u8               max_header_size)
837 {
838   DENTER(IRDA_SERV_TRACE, "(server=0x%p, new=0x%p)\n",
839          server, new);
840 
841   /* Now attach up the new socket */
842   new->tsap = irttp_dup(server->tsap, new);
843   DABORT(new->tsap == NULL, -1, IRDA_SERV_ERROR, "dup failed!\n");
844 
845   /* Set up all the relevant parameters on the new socket */
846   new->stsap_sel = new->tsap->stsap_sel;
847   new->dtsap_sel = new->tsap->dtsap_sel;
848   new->saddr = irttp_get_saddr(new->tsap);
849   new->daddr = irttp_get_daddr(new->tsap);
850 
851   new->max_header_size = max_header_size;
852   new->max_sdu_size_tx = max_sdu_size;
853   new->max_data_size   = max_sdu_size;
854 #ifdef STREAM_COMPAT
855   /* If we want to receive "stream sockets" */
856   if(max_sdu_size == 0)
857     new->max_data_size = irttp_get_max_seg_size(new->tsap);
858 #endif /* STREAM_COMPAT */
859 
860   /* Clean up the original one to keep it in listen state */
861   irttp_listen(server->tsap);
862 
863   /* Send a connection response on the new socket */
864   irttp_connect_response(new->tsap, new->max_sdu_size_rx, NULL);
865 
866   /* Allow PPP to send its junk over the new socket... */
867   set_bit(0, &new->ttp_open);
868 
869   /* Not connecting anymore, and clean up last possible remains
870    * of connection attempts on the socket */
871   clear_bit(0, &new->ttp_connect);
872   if(new->iriap)
873     {
874       iriap_close(new->iriap);
875       new->iriap = NULL;
876     }
877   if(new->discoveries != NULL)
878     {
879       kfree(new->discoveries);
880       new->discoveries = NULL;
881     }
882 
883 #ifdef CONNECT_INDIC_KICK
884   /* As currently we don't block packets in ppp_irnet_send() while passive,
885    * this is not really needed...
886    * Also, not doing it give IrDA a chance to finish the setup properly
887    * before being swamped with packets... */
888   ppp_output_wakeup(&new->chan);
889 #endif /* CONNECT_INDIC_KICK */
890 
891   /* Notify the control channel */
892   irnet_post_event(new, IRNET_CONNECT_FROM,
893                    new->saddr, new->daddr, server->rname, 0);
894 
895   DEXIT(IRDA_SERV_TRACE, "\n");
896   return 0;
897 }
898 
899 /*------------------------------------------------------------------*/
900 /*
901  * Function irda_disconnect_server (self)
902  *
903  *    Cleanup the server socket when the incoming connection abort
904  *
905  */
906 static inline void
907 irnet_disconnect_server(irnet_socket *  self,
908                         struct sk_buff *skb)
909 {
910   DENTER(IRDA_SERV_TRACE, "(self=0x%p)\n", self);
911 
912   /* Put the received packet in the black hole */
913   kfree_skb(skb);
914 
915 #ifdef FAIL_SEND_DISCONNECT
916   /* Tell the other party we don't want to be connected */
917   /* Hum... Is it the right thing to do ? And do we need to send
918    * a connect response before ? It looks ok without this... */
919   irttp_disconnect_request(self->tsap, NULL, P_NORMAL);
920 #endif /* FAIL_SEND_DISCONNECT */
921 
922   /* Notify the control channel (see irnet_find_socket()) */
923   irnet_post_event(NULL, IRNET_REQUEST_FROM,
924                    self->saddr, self->daddr, self->rname, 0);
925 
926   /* Clean up the server to keep it in listen state */
927   irttp_listen(self->tsap);
928 
929   DEXIT(IRDA_SERV_TRACE, "\n");
930 }
931 
932 /*------------------------------------------------------------------*/
933 /*
934  * Function irda_setup_server (self)
935  *
936  *    Create a IrTTP server and set it up...
937  *
938  * Register the IrLAN hint bit, create a IrTTP instance for us,
939  * set all the IrTTP callbacks and create an IrIAS entry...
940  */
941 static inline int
942 irnet_setup_server(void)
943 {
944   __u16         hints;
945 
946   DENTER(IRDA_SERV_TRACE, "()\n");
947 
948   /* Initialise the regular socket part of the server */
949   irda_irnet_create(&irnet_server.s);
950 
951   /* Open a local TSAP (an IrTTP instance) for the server */
952   irnet_open_tsap(&irnet_server.s);
953 
954   /* PPP part setup */
955   irnet_server.s.ppp_open = 0;
956   irnet_server.s.chan.private = NULL;
957   irnet_server.s.file = NULL;
958 
959   /* Get the hint bit corresponding to IrLAN */
960   /* Note : we overload the IrLAN hint bit. As it is only a "hint", and as
961    * we provide roughly the same functionality as IrLAN, this is ok.
962    * In fact, the situation is similar as JetSend overloading the Obex hint
963    */
964   hints = irlmp_service_to_hint(S_LAN);
965 
966 #ifdef ADVERTISE_HINT
967   /* Register with IrLMP as a service (advertise our hint bit) */
968   irnet_server.skey = irlmp_register_service(hints);
969 #endif /* ADVERTISE_HINT */
970 
971   /* Register with LM-IAS (so that people can connect to us) */
972   irnet_server.ias_obj = irias_new_object(IRNET_SERVICE_NAME, jiffies);
973   irias_add_integer_attrib(irnet_server.ias_obj, IRNET_IAS_VALUE,
974                            irnet_server.s.stsap_sel, IAS_KERNEL_ATTR);
975   irias_insert_object(irnet_server.ias_obj);
976 
977 #ifdef DISCOVERY_EVENTS
978   /* Tell IrLMP we want to be notified of newly discovered nodes */
979   irlmp_update_client(irnet_server.s.ckey, hints,
980                       irnet_discovery_indication, irnet_expiry_indication,
981                       (void *) &irnet_server.s);
982 #endif
983 
984   DEXIT(IRDA_SERV_TRACE, " - self=0x%p\n", &irnet_server.s);
985   return 0;
986 }
987 
988 /*------------------------------------------------------------------*/
989 /*
990  * Function irda_destroy_server (self)
991  *
992  *    Destroy the IrTTP server...
993  *
994  * Reverse of the previous function...
995  */
996 static inline void
997 irnet_destroy_server(void)
998 {
999   DENTER(IRDA_SERV_TRACE, "()\n");
1000 
1001 #ifdef ADVERTISE_HINT
1002   /* Unregister with IrLMP */
1003   irlmp_unregister_service(irnet_server.skey);
1004 #endif /* ADVERTISE_HINT */
1005 
1006   /* Unregister with LM-IAS */
1007   if(irnet_server.ias_obj)
1008     irias_delete_object(irnet_server.ias_obj);
1009 
1010   /* Cleanup the socket part */
1011   irda_irnet_destroy(&irnet_server.s);
1012 
1013   DEXIT(IRDA_SERV_TRACE, "\n");
1014 }
1015 
1016 
1017 /************************ IRDA-TTP CALLBACKS ************************/
1018 /*
1019  * When we create a IrTTP instance, we pass to it a set of callbacks
1020  * that IrTTP will call in case of various events.
1021  * We take care of those events here.
1022  */
1023 
1024 /*------------------------------------------------------------------*/
1025 /*
1026  * Function irnet_data_indication (instance, sap, skb)
1027  *
1028  *    Received some data from TinyTP. Just queue it on the receive queue
1029  *
1030  */
1031 static int
1032 irnet_data_indication(void *    instance,
1033                       void *    sap,
1034                       struct sk_buff *skb)
1035 {
1036   irnet_socket *        ap = (irnet_socket *) instance;
1037   unsigned char *       p;
1038   int                   code = 0;
1039 
1040   DENTER(IRDA_TCB_TRACE, "(self/ap=0x%p, skb=0x%p)\n",
1041          ap, skb);
1042   DASSERT(skb != NULL, 0, IRDA_CB_ERROR, "skb is NULL !!!\n");
1043 
1044   /* Check is ppp is ready to receive our packet */
1045   if(!ap->ppp_open)
1046     {
1047       DERROR(IRDA_CB_ERROR, "PPP not ready, dropping packet...\n");
1048       /* When we return error, TTP will need to requeue the skb and
1049        * will stop the sender. IrTTP will stall until we send it a
1050        * flow control request... */
1051       return -ENOMEM;
1052     }
1053 
1054   /* strip address/control field if present */
1055   p = skb->data;
1056   if((p[0] == PPP_ALLSTATIONS) && (p[1] == PPP_UI))
1057     {
1058       /* chop off address/control */
1059       if(skb->len < 3)
1060         goto err_exit;
1061       p = skb_pull(skb, 2);
1062     }
1063 
1064   /* decompress protocol field if compressed */
1065   if(p[0] & 1)
1066     {
1067       /* protocol is compressed */
1068       skb_push(skb, 1)[0] = 0;
1069     }
1070   else
1071     if(skb->len < 2)
1072       goto err_exit;
1073 
1074   /* pass to generic ppp layer */
1075   /* Note : how do I know if ppp can accept or not the packet ? This is
1076    * essential if I want to manage flow control smoothly... */
1077   ppp_input(&ap->chan, skb);
1078 
1079   DEXIT(IRDA_TCB_TRACE, "\n");
1080   return 0;
1081 
1082  err_exit:
1083   DERROR(IRDA_CB_ERROR, "Packet too small, dropping...\n");
1084   kfree_skb(skb);
1085   ppp_input_error(&ap->chan, code);
1086   return 0;     /* Don't return an error code, only for flow control... */
1087 }
1088 
1089 /*------------------------------------------------------------------*/
1090 /*
1091  * Function irnet_disconnect_indication (instance, sap, reason, skb)
1092  *
1093  *    Connection has been closed. Chech reason to find out why
1094  *
1095  * Note : there are many cases where we come here :
1096  *      o attempted to connect, timeout
1097  *      o connected, link is broken, LAP has timeout
1098  *      o connected, other side close the link
1099  *      o connection request on the server not handled
1100  */
1101 static void
1102 irnet_disconnect_indication(void *      instance,
1103                             void *      sap,
1104                             LM_REASON   reason,
1105                             struct sk_buff *skb)
1106 {
1107   irnet_socket *        self = (irnet_socket *) instance;
1108   int                   test_open;
1109   int                   test_connect;
1110 
1111   DENTER(IRDA_TCB_TRACE, "(self=0x%p)\n", self);
1112   DASSERT(self != NULL, , IRDA_CB_ERROR, "Self is NULL !!!\n");
1113 
1114   /* Don't care about it, but let's not leak it */
1115   if(skb)
1116     dev_kfree_skb(skb);
1117 
1118   /* Prevent higher layer from accessing IrTTP */
1119   test_open = test_and_clear_bit(0, &self->ttp_open);
1120   /* Not connecting anymore...
1121    * (note : TSAP is open, so IAP callbacks are no longer pending...) */
1122   test_connect = test_and_clear_bit(0, &self->ttp_connect);
1123 
1124   /* If both self->ttp_open and self->ttp_connect are NULL, it mean that we
1125    * have a race condition with irda_irnet_destroy() or
1126    * irnet_connect_indication(), so don't mess up tsap...
1127    */
1128   if(!(test_open || test_connect))
1129     {
1130       DERROR(IRDA_CB_ERROR, "Race condition detected...\n");
1131       return;
1132     }
1133 
1134   /* If we were active, notify the control channel */
1135   if(test_open)
1136     irnet_post_event(self, IRNET_DISCONNECT_FROM,
1137                      self->saddr, self->daddr, self->rname, 0);
1138   else
1139     /* If we were trying to connect, notify the control channel */
1140     if((self->tsap) && (self != &irnet_server.s))
1141       irnet_post_event(self, IRNET_NOANSWER_FROM,
1142                        self->saddr, self->daddr, self->rname, 0);
1143 
1144   /* Close our IrTTP connection, cleanup tsap */
1145   if((self->tsap) && (self != &irnet_server.s))
1146     {
1147       DEBUG(IRDA_CB_INFO, "Closing our TTP connection.\n");
1148       irttp_close_tsap(self->tsap);
1149       self->tsap = NULL;
1150     }
1151   /* Cleanup the socket in case we want to reconnect in ppp_output_wakeup() */
1152   self->stsap_sel = 0;
1153   self->daddr = DEV_ADDR_ANY;
1154   self->tx_flow = FLOW_START;
1155 
1156   /* Deal with the ppp instance if it's still alive */
1157   if(self->ppp_open)
1158     {
1159       if(test_open)
1160         {
1161           /* ppp_unregister_channel() wants a user context. */
1162           schedule_work(&self->disconnect_work);
1163         }
1164       else
1165         {
1166           /* If we were trying to connect, flush (drain) ppp_generic
1167            * Tx queue (most often we have blocked it), which will
1168            * trigger an other attempt to connect. If we are passive,
1169            * this will empty the Tx queue after last try. */
1170           ppp_output_wakeup(&self->chan);
1171         }
1172     }
1173 
1174   DEXIT(IRDA_TCB_TRACE, "\n");
1175 }
1176 
1177 /*------------------------------------------------------------------*/
1178 /*
1179  * Function irnet_connect_confirm (instance, sap, qos, max_sdu_size, skb)
1180  *
1181  *    Connections has been confirmed by the remote device
1182  *
1183  */
1184 static void
1185 irnet_connect_confirm(void *    instance,
1186                       void *    sap,
1187                       struct qos_info *qos,
1188                       __u32     max_sdu_size,
1189                       __u8      max_header_size,
1190                       struct sk_buff *skb)
1191 {
1192   irnet_socket *        self = (irnet_socket *) instance;
1193 
1194   DENTER(IRDA_TCB_TRACE, "(self=0x%p)\n", self);
1195 
1196   /* Check if socket is closing down (via irda_irnet_destroy()) */
1197   if(! test_bit(0, &self->ttp_connect))
1198     {
1199       DERROR(IRDA_CB_ERROR, "Socket no longer connecting. Ouch !\n");
1200       return;
1201     }
1202 
1203   /* How much header space do we need to reserve */
1204   self->max_header_size = max_header_size;
1205 
1206   /* IrTTP max SDU size in transmit direction */
1207   self->max_sdu_size_tx = max_sdu_size;
1208   self->max_data_size = max_sdu_size;
1209 #ifdef STREAM_COMPAT
1210   if(max_sdu_size == 0)
1211     self->max_data_size = irttp_get_max_seg_size(self->tsap);
1212 #endif /* STREAM_COMPAT */
1213 
1214   /* At this point, IrLMP has assigned our source address */
1215   self->saddr = irttp_get_saddr(self->tsap);
1216 
1217   /* Allow higher layer to access IrTTP */
1218   set_bit(0, &self->ttp_open);
1219   clear_bit(0, &self->ttp_connect);     /* Not racy, IrDA traffic is serial */
1220   /* Give a kick in the ass of ppp_generic so that he sends us some data */
1221   ppp_output_wakeup(&self->chan);
1222 
1223   /* Check size of received packet */
1224   if(skb->len > 0)
1225     {
1226 #ifdef PASS_CONNECT_PACKETS
1227       DEBUG(IRDA_CB_INFO, "Passing connect packet to PPP.\n");
1228       /* Try to pass it to PPP */
1229       irnet_data_indication(instance, sap, skb);
1230 #else /* PASS_CONNECT_PACKETS */
1231       DERROR(IRDA_CB_ERROR, "Dropping non empty packet.\n");
1232       kfree_skb(skb);   /* Note : will be optimised with other kfree... */
1233 #endif /* PASS_CONNECT_PACKETS */
1234     }
1235   else
1236     kfree_skb(skb);
1237 
1238   /* Notify the control channel */
1239   irnet_post_event(self, IRNET_CONNECT_TO,
1240                    self->saddr, self->daddr, self->rname, 0);
1241 
1242   DEXIT(IRDA_TCB_TRACE, "\n");
1243 }
1244 
1245 /*------------------------------------------------------------------*/
1246 /*
1247  * Function irnet_flow_indication (instance, sap, flow)
1248  *
1249  *    Used by TinyTP to tell us if it can accept more data or not
1250  *
1251  */
1252 static void
1253 irnet_flow_indication(void *    instance,
1254                       void *    sap,
1255                       LOCAL_FLOW flow)
1256 {
1257   irnet_socket *        self = (irnet_socket *) instance;
1258   LOCAL_FLOW            oldflow = self->tx_flow;
1259 
1260   DENTER(IRDA_TCB_TRACE, "(self=0x%p, flow=%d)\n", self, flow);
1261 
1262   /* Update our state */
1263   self->tx_flow = flow;
1264 
1265   /* Check what IrTTP want us to do... */
1266   switch(flow)
1267     {
1268     case FLOW_START:
1269       DEBUG(IRDA_CB_INFO, "IrTTP wants us to start again\n");
1270       /* Check if we really need to wake up PPP */
1271       if(oldflow == FLOW_STOP)
1272         ppp_output_wakeup(&self->chan);
1273       else
1274         DEBUG(IRDA_CB_INFO, "But we were already transmitting !!!\n");
1275       break;
1276     case FLOW_STOP:
1277       DEBUG(IRDA_CB_INFO, "IrTTP wants us to slow down\n");
1278       break;
1279     default:
1280       DEBUG(IRDA_CB_INFO, "Unknown flow command!\n");
1281       break;
1282     }
1283 
1284   DEXIT(IRDA_TCB_TRACE, "\n");
1285 }
1286 
1287 /*------------------------------------------------------------------*/
1288 /*
1289  * Function irnet_status_indication (instance, sap, reason, skb)
1290  *
1291  *    Link (IrLAP) status report.
1292  *
1293  */
1294 static void
1295 irnet_status_indication(void *  instance,
1296                         LINK_STATUS link,
1297                         LOCK_STATUS lock)
1298 {
1299   irnet_socket *        self = (irnet_socket *) instance;
1300 
1301   DENTER(IRDA_TCB_TRACE, "(self=0x%p)\n", self);
1302   DASSERT(self != NULL, , IRDA_CB_ERROR, "Self is NULL !!!\n");
1303 
1304   /* We can only get this event if we are connected */
1305   switch(link)
1306     {
1307     case STATUS_NO_ACTIVITY:
1308       irnet_post_event(self, IRNET_BLOCKED_LINK,
1309                        self->saddr, self->daddr, self->rname, 0);
1310       break;
1311     default:
1312       DEBUG(IRDA_CB_INFO, "Unknown status...\n");
1313     }
1314 
1315   DEXIT(IRDA_TCB_TRACE, "\n");
1316 }
1317 
1318 /*------------------------------------------------------------------*/
1319 /*
1320  * Function irnet_connect_indication(instance, sap, qos, max_sdu_size, userdata)
1321  *
1322  *    Incoming connection
1323  *
1324  * In theory, this function is called only on the server socket.
1325  * Some other node is attempting to connect to the IrNET service, and has
1326  * sent a connection request on our server socket.
1327  * We just redirect the connection to the relevant IrNET socket.
1328  *
1329  * Note : we also make sure that between 2 irnet nodes, there can
1330  * exist only one irnet connection.
1331  */
1332 static void
1333 irnet_connect_indication(void *         instance,
1334                          void *         sap,
1335                          struct qos_info *qos,
1336                          __u32          max_sdu_size,
1337                          __u8           max_header_size,
1338                          struct sk_buff *skb)
1339 {
1340   irnet_socket *        server = &irnet_server.s;
1341   irnet_socket *        new = (irnet_socket *) NULL;
1342 
1343   DENTER(IRDA_TCB_TRACE, "(server=0x%p)\n", server);
1344   DASSERT(instance == &irnet_server, , IRDA_CB_ERROR,
1345           "Invalid instance (0x%p) !!!\n", instance);
1346   DASSERT(sap == irnet_server.s.tsap, , IRDA_CB_ERROR, "Invalid sap !!!\n");
1347 
1348   /* Try to find the most appropriate IrNET socket */
1349   new = irnet_find_socket(server);
1350 
1351   /* After all this hard work, do we have an socket ? */
1352   if(new == (irnet_socket *) NULL)
1353     {
1354       DEXIT(IRDA_CB_INFO, ": No socket waiting for this connection.\n");
1355       irnet_disconnect_server(server, skb);
1356       return;
1357     }
1358 
1359   /* Is the socket already busy ? */
1360   if(test_bit(0, &new->ttp_open))
1361     {
1362       DEXIT(IRDA_CB_INFO, ": Socket already connected.\n");
1363       irnet_disconnect_server(server, skb);
1364       return;
1365     }
1366 
1367   /* The following code is a bit tricky, so need comments ;-)
1368    */
1369   /* If ttp_connect is set, the socket is trying to connect to the other
1370    * end and may have sent a IrTTP connection request and is waiting for
1371    * a connection response (that may never come).
1372    * Now, the pain is that the socket may have opened a tsap and is
1373    * waiting on it, while the other end is trying to connect to it on
1374    * another tsap.
1375    * Because IrNET can be peer to peer, we need to workaround this.
1376    * Furthermore, the way the irnetd script is implemented, the
1377    * target will create a second IrNET connection back to the
1378    * originator and expect the originator to bind this new connection
1379    * to the original PPPD instance.
1380    * And of course, if we don't use irnetd, we can have a race when
1381    * both side try to connect simultaneously, which could leave both
1382    * connections half closed (yuck).
1383    * Conclusions :
1384    *    1) The "originator" must accept the new connection and get rid
1385    *       of the old one so that irnetd works
1386    *    2) One side must deny the new connection to avoid races,
1387    *       but both side must agree on which side it is...
1388    * Most often, the originator is primary at the LAP layer.
1389    * Jean II
1390    */
1391   /* Now, let's look at the way I wrote the test...
1392    * We need to clear up the ttp_connect flag atomically to prevent
1393    * irnet_disconnect_indication() to mess up the tsap we are going to close.
1394    * We want to clear the ttp_connect flag only if we close the tsap,
1395    * otherwise we will never close it, so we need to check for primary
1396    * *before* doing the test on the flag.
1397    * And of course, ALLOW_SIMULT_CONNECT can disable this entirely...
1398    * Jean II
1399    */
1400 
1401   /* Socket already connecting ? On primary ? */
1402   if(0
1403 #ifdef ALLOW_SIMULT_CONNECT
1404      || ((irttp_is_primary(server->tsap) == 1) &&       /* primary */
1405          (test_and_clear_bit(0, &new->ttp_connect)))
1406 #endif /* ALLOW_SIMULT_CONNECT */
1407      )
1408     {
1409       DERROR(IRDA_CB_ERROR, "Socket already connecting, but going to reuse it !\n");
1410 
1411       /* Cleanup the old TSAP if necessary - IrIAP will be cleaned up later */
1412       if(new->tsap != NULL)
1413         {
1414           /* Close the old connection the new socket was attempting,
1415            * so that we can hook it up to the new connection.
1416            * It's now safe to do it... */
1417           irttp_close_tsap(new->tsap);
1418           new->tsap = NULL;
1419         }
1420     }
1421   else
1422     {
1423       /* Three options :
1424        * 1) socket was not connecting or connected : ttp_connect should be 0.
1425        * 2) we don't want to connect the socket because we are secondary or
1426        * ALLOW_SIMULT_CONNECT is undefined. ttp_connect should be 1.
1427        * 3) we are half way in irnet_disconnect_indication(), and it's a
1428        * nice race condition... Fortunately, we can detect that by checking
1429        * if tsap is still alive. On the other hand, we can't be in
1430        * irda_irnet_destroy() otherwise we would not have found this
1431        * socket in the hashbin.
1432        * Jean II */
1433       if((test_bit(0, &new->ttp_connect)) || (new->tsap != NULL))
1434         {
1435           /* Don't mess this socket, somebody else in in charge... */
1436           DERROR(IRDA_CB_ERROR, "Race condition detected, socket in use, abort connect...\n");
1437           irnet_disconnect_server(server, skb);
1438           return;
1439         }
1440     }
1441 
1442   /* So : at this point, we have a socket, and it is idle. Good ! */
1443   irnet_connect_socket(server, new, qos, max_sdu_size, max_header_size);
1444 
1445   /* Check size of received packet */
1446   if(skb->len > 0)
1447     {
1448 #ifdef PASS_CONNECT_PACKETS
1449       DEBUG(IRDA_CB_INFO, "Passing connect packet to PPP.\n");
1450       /* Try to pass it to PPP */
1451       irnet_data_indication(new, new->tsap, skb);
1452 #else /* PASS_CONNECT_PACKETS */
1453       DERROR(IRDA_CB_ERROR, "Dropping non empty packet.\n");
1454       kfree_skb(skb);   /* Note : will be optimised with other kfree... */
1455 #endif /* PASS_CONNECT_PACKETS */
1456     }
1457   else
1458     kfree_skb(skb);
1459 
1460   DEXIT(IRDA_TCB_TRACE, "\n");
1461 }
1462 
1463 
1464 /********************** IRDA-IAS/LMP CALLBACKS **********************/
1465 /*
1466  * These are the callbacks called by other layers of the IrDA stack,
1467  * mainly LMP for discovery and IAS for name queries.
1468  */
1469 
1470 /*------------------------------------------------------------------*/
1471 /*
1472  * Function irnet_getvalue_confirm (result, obj_id, value, priv)
1473  *
1474  *    Got answer from remote LM-IAS, just connect
1475  *
1476  * This is the reply to a IAS query we were doing to find the TSAP of
1477  * the device we want to connect to.
1478  * If we have found a valid TSAP, just initiate the TTP connection
1479  * on this TSAP.
1480  */
1481 static void
1482 irnet_getvalue_confirm(int      result,
1483                        __u16    obj_id,
1484                        struct ias_value *value,
1485                        void *   priv)
1486 {
1487   irnet_socket *        self = (irnet_socket *) priv;
1488 
1489   DENTER(IRDA_OCB_TRACE, "(self=0x%p)\n", self);
1490   DASSERT(self != NULL, , IRDA_OCB_ERROR, "Self is NULL !!!\n");
1491 
1492   /* Check if already connected (via irnet_connect_socket())
1493    * or socket is closing down (via irda_irnet_destroy()) */
1494   if(! test_bit(0, &self->ttp_connect))
1495     {
1496       DERROR(IRDA_OCB_ERROR, "Socket no longer connecting. Ouch !\n");
1497       return;
1498     }
1499 
1500   /* We probably don't need to make any more queries */
1501   iriap_close(self->iriap);
1502   self->iriap = NULL;
1503 
1504   /* Post process the IAS reply */
1505   self->dtsap_sel = irnet_ias_to_tsap(self, result, value);
1506 
1507   /* If error, just go out */
1508   if(self->errno)
1509     {
1510       clear_bit(0, &self->ttp_connect);
1511       DERROR(IRDA_OCB_ERROR, "IAS connect failed ! (0x%X)\n", self->errno);
1512       return;
1513     }
1514 
1515   DEBUG(IRDA_OCB_INFO, "daddr = %08x, lsap = %d, starting IrTTP connection\n",
1516         self->daddr, self->dtsap_sel);
1517 
1518   /* Start up TTP - non blocking */
1519   irnet_connect_tsap(self);
1520 
1521   DEXIT(IRDA_OCB_TRACE, "\n");
1522 }
1523 
1524 /*------------------------------------------------------------------*/
1525 /*
1526  * Function irnet_discovervalue_confirm (result, obj_id, value, priv)
1527  *
1528  *    Handle the TSAP discovery procedure state machine.
1529  *    Got answer from remote LM-IAS, try next device
1530  *
1531  * We are doing a  TSAP discovery procedure, and we got an answer to
1532  * a IAS query we were doing to find the TSAP on one of the address
1533  * in the discovery log.
1534  *
1535  * If we have found a valid TSAP for the first time, save it. If it's
1536  * not the first time we found one, complain.
1537  *
1538  * If we have more addresses in the log, just initiate a new query.
1539  * Note that those query may fail (see irnet_discover_daddr_and_lsap_sel())
1540  *
1541  * Otherwise, wrap up the procedure (cleanup), check if we have found
1542  * any device and connect to it.
1543  */
1544 static void
1545 irnet_discovervalue_confirm(int         result,
1546                             __u16       obj_id,
1547                             struct ias_value *value,
1548                             void *      priv)
1549 {
1550   irnet_socket *        self = (irnet_socket *) priv;
1551   __u8                  dtsap_sel;              /* TSAP we are looking for */
1552 
1553   DENTER(IRDA_OCB_TRACE, "(self=0x%p)\n", self);
1554   DASSERT(self != NULL, , IRDA_OCB_ERROR, "Self is NULL !!!\n");
1555 
1556   /* Check if already connected (via irnet_connect_socket())
1557    * or socket is closing down (via irda_irnet_destroy()) */
1558   if(! test_bit(0, &self->ttp_connect))
1559     {
1560       DERROR(IRDA_OCB_ERROR, "Socket no longer connecting. Ouch !\n");
1561       return;
1562     }
1563 
1564   /* Post process the IAS reply */
1565   dtsap_sel = irnet_ias_to_tsap(self, result, value);
1566 
1567   /* Have we got something ? */
1568   if(self->errno == 0)
1569     {
1570       /* We found the requested service */
1571       if(self->daddr != DEV_ADDR_ANY)
1572         {
1573           DERROR(IRDA_OCB_ERROR, "More than one device in range supports IrNET...\n");
1574         }
1575       else
1576         {
1577           /* First time we found that one, save it ! */
1578           self->daddr = self->discoveries[self->disco_index].daddr;
1579           self->dtsap_sel = dtsap_sel;
1580         }
1581     }
1582 
1583   /* If no failure */
1584   if((self->errno == -EADDRNOTAVAIL) || (self->errno == 0))
1585     {
1586       int       ret;
1587 
1588       /* Search the next node */
1589       ret = irnet_discover_next_daddr(self);
1590       if(!ret)
1591         {
1592           /* In this case, the above request was non-blocking.
1593            * We will return here after a while... */
1594           return;
1595         }
1596       /* In this case, we have processed the last discovery item */
1597     }
1598 
1599   /* No more queries to be done (failure or last one) */
1600 
1601   /* We probably don't need to make any more queries */
1602   iriap_close(self->iriap);
1603   self->iriap = NULL;
1604 
1605   /* No more items : remove the log and signal termination */
1606   DEBUG(IRDA_OCB_INFO, "Cleaning up log (0x%p)\n",
1607         self->discoveries);
1608   if(self->discoveries != NULL)
1609     {
1610       /* Cleanup our copy of the discovery log */
1611       kfree(self->discoveries);
1612       self->discoveries = NULL;
1613     }
1614   self->disco_number = -1;
1615 
1616   /* Check out what we found */
1617   if(self->daddr == DEV_ADDR_ANY)
1618     {
1619       self->daddr = DEV_ADDR_ANY;
1620       clear_bit(0, &self->ttp_connect);
1621       DEXIT(IRDA_OCB_TRACE, ": cannot discover IrNET in any device !!!\n");
1622       return;
1623     }
1624 
1625   /* We have a valid address - just connect */
1626 
1627   DEBUG(IRDA_OCB_INFO, "daddr = %08x, lsap = %d, starting IrTTP connection\n",
1628         self->daddr, self->dtsap_sel);
1629 
1630   /* Start up TTP - non blocking */
1631   irnet_connect_tsap(self);
1632 
1633   DEXIT(IRDA_OCB_TRACE, "\n");
1634 }
1635 
1636 #ifdef DISCOVERY_EVENTS
1637 /*------------------------------------------------------------------*/
1638 /*
1639  * Function irnet_discovery_indication (discovery)
1640  *
1641  *    Got a discovery indication from IrLMP, post an event
1642  *
1643  * Note : IrLMP take care of matching the hint mask for us, and also
1644  * check if it is a "new" node for us...
1645  *
1646  * As IrLMP filter on the IrLAN hint bit, we get both IrLAN and IrNET
1647  * nodes, so it's only at connection time that we will know if the
1648  * node support IrNET, IrLAN or both. The other solution is to check
1649  * in IAS the PNP ids and service name.
1650  * Note : even if a node support IrNET (or IrLAN), it's no guarantee
1651  * that we will be able to connect to it, the node might already be
1652  * busy...
1653  *
1654  * One last thing : in some case, this function will trigger duplicate
1655  * discovery events. On the other hand, we should catch all
1656  * discoveries properly (i.e. not miss one). Filtering duplicate here
1657  * is to messy, so we leave that to user space...
1658  */
1659 static void
1660 irnet_discovery_indication(discinfo_t *         discovery,
1661                            DISCOVERY_MODE       mode,
1662                            void *               priv)
1663 {
1664   irnet_socket *        self = &irnet_server.s;
1665 
1666   DENTER(IRDA_OCB_TRACE, "(self=0x%p)\n", self);
1667   DASSERT(priv == &irnet_server, , IRDA_OCB_ERROR,
1668           "Invalid instance (0x%p) !!!\n", priv);
1669 
1670   DEBUG(IRDA_OCB_INFO, "Discovered new IrNET/IrLAN node %s...\n",
1671         discovery->info);
1672 
1673   /* Notify the control channel */
1674   irnet_post_event(NULL, IRNET_DISCOVER,
1675                    discovery->saddr, discovery->daddr, discovery->info,
1676                    get_unaligned((__u16 *)discovery->hints));
1677 
1678   DEXIT(IRDA_OCB_TRACE, "\n");
1679 }
1680 
1681 /*------------------------------------------------------------------*/
1682 /*
1683  * Function irnet_expiry_indication (expiry)
1684  *
1685  *    Got a expiry indication from IrLMP, post an event
1686  *
1687  * Note : IrLMP take care of matching the hint mask for us, we only
1688  * check if it is a "new" node...
1689  */
1690 static void
1691 irnet_expiry_indication(discinfo_t *    expiry,
1692                         DISCOVERY_MODE  mode,
1693                         void *          priv)
1694 {
1695   irnet_socket *        self = &irnet_server.s;
1696 
1697   DENTER(IRDA_OCB_TRACE, "(self=0x%p)\n", self);
1698   DASSERT(priv == &irnet_server, , IRDA_OCB_ERROR,
1699           "Invalid instance (0x%p) !!!\n", priv);
1700 
1701   DEBUG(IRDA_OCB_INFO, "IrNET/IrLAN node %s expired...\n",
1702         expiry->info);
1703 
1704   /* Notify the control channel */
1705   irnet_post_event(NULL, IRNET_EXPIRE,
1706                    expiry->saddr, expiry->daddr, expiry->info,
1707                    get_unaligned((__u16 *)expiry->hints));
1708 
1709   DEXIT(IRDA_OCB_TRACE, "\n");
1710 }
1711 #endif /* DISCOVERY_EVENTS */
1712 
1713 
1714 /*********************** PROC ENTRY CALLBACKS ***********************/
1715 /*
1716  * We create a instance in the /proc filesystem, and here we take care
1717  * of that...
1718  */
1719 
1720 #ifdef CONFIG_PROC_FS
1721 static int
1722 irnet_proc_show(struct seq_file *m, void *v)
1723 {
1724   irnet_socket *        self;
1725   char *                state;
1726   int                   i = 0;
1727 
1728   /* Get the IrNET server information... */
1729   seq_printf(m, "IrNET server - ");
1730   seq_printf(m, "IrDA state: %s, ",
1731                  (irnet_server.running ? "running" : "dead"));
1732   seq_printf(m, "stsap_sel: %02x, ", irnet_server.s.stsap_sel);
1733   seq_printf(m, "dtsap_sel: %02x\n", irnet_server.s.dtsap_sel);
1734 
1735   /* Do we need to continue ? */
1736   if(!irnet_server.running)
1737     return 0;
1738 
1739   /* Protect access to the instance list */
1740   spin_lock_bh(&irnet_server.spinlock);
1741 
1742   /* Get the sockets one by one... */
1743   self = (irnet_socket *) hashbin_get_first(irnet_server.list);
1744   while(self != NULL)
1745     {
1746       /* Start printing info about the socket. */
1747       seq_printf(m, "\nIrNET socket %d - ", i++);
1748 
1749       /* First, get the requested configuration */
1750       seq_printf(m, "Requested IrDA name: \"%s\", ", self->rname);
1751       seq_printf(m, "daddr: %08x, ", self->rdaddr);
1752       seq_printf(m, "saddr: %08x\n", self->rsaddr);
1753 
1754       /* Second, get all the PPP info */
1755       seq_printf(m, "   PPP state: %s",
1756                  (self->ppp_open ? "registered" : "unregistered"));
1757       if(self->ppp_open)
1758         {
1759           seq_printf(m, ", unit: ppp%d",
1760                          ppp_unit_number(&self->chan));
1761           seq_printf(m, ", channel: %d",
1762                          ppp_channel_index(&self->chan));
1763           seq_printf(m, ", mru: %d",
1764                          self->mru);
1765           /* Maybe add self->flags ? Later... */
1766         }
1767 
1768       /* Then, get all the IrDA specific info... */
1769       if(self->ttp_open)
1770         state = "connected";
1771       else
1772         if(self->tsap != NULL)
1773           state = "connecting";
1774         else
1775           if(self->iriap != NULL)
1776             state = "searching";
1777           else
1778             if(self->ttp_connect)
1779               state = "weird";
1780             else
1781               state = "idle";
1782       seq_printf(m, "\n IrDA state: %s, ", state);
1783       seq_printf(m, "daddr: %08x, ", self->daddr);
1784       seq_printf(m, "stsap_sel: %02x, ", self->stsap_sel);
1785       seq_printf(m, "dtsap_sel: %02x\n", self->dtsap_sel);
1786 
1787       /* Next socket, please... */
1788       self = (irnet_socket *) hashbin_get_next(irnet_server.list);
1789     }
1790 
1791   /* Spin lock end */
1792   spin_unlock_bh(&irnet_server.spinlock);
1793 
1794   return 0;
1795 }
1796 
1797 static int irnet_proc_open(struct inode *inode, struct file *file)
1798 {
1799         return single_open(file, irnet_proc_show, NULL);
1800 }
1801 
1802 static const struct file_operations irnet_proc_fops = {
1803         .owner          = THIS_MODULE,
1804         .open           = irnet_proc_open,
1805         .read           = seq_read,
1806         .llseek         = seq_lseek,
1807         .release        = single_release,
1808 };
1809 #endif /* PROC_FS */
1810 
1811 
1812 /********************** CONFIGURATION/CLEANUP **********************/
1813 /*
1814  * Initialisation and teardown of the IrDA part, called at module
1815  * insertion and removal...
1816  */
1817 
1818 /*------------------------------------------------------------------*/
1819 /*
1820  * Prepare the IrNET layer for operation...
1821  */
1822 int __init
1823 irda_irnet_init(void)
1824 {
1825   int           err = 0;
1826 
1827   DENTER(MODULE_TRACE, "()\n");
1828 
1829   /* Pure paranoia - should be redundant */
1830   memset(&irnet_server, 0, sizeof(struct irnet_root));
1831 
1832   /* Setup start of irnet instance list */
1833   irnet_server.list = hashbin_new(HB_NOLOCK);
1834   DABORT(irnet_server.list == NULL, -ENOMEM,
1835          MODULE_ERROR, "Can't allocate hashbin!\n");
1836   /* Init spinlock for instance list */
1837   spin_lock_init(&irnet_server.spinlock);
1838 
1839   /* Initialise control channel */
1840   init_waitqueue_head(&irnet_events.rwait);
1841   irnet_events.index = 0;
1842   /* Init spinlock for event logging */
1843   spin_lock_init(&irnet_events.spinlock);
1844 
1845 #ifdef CONFIG_PROC_FS
1846   /* Add a /proc file for irnet infos */
1847   proc_create("irnet", 0, proc_irda, &irnet_proc_fops);
1848 #endif /* CONFIG_PROC_FS */
1849 
1850   /* Setup the IrNET server */
1851   err = irnet_setup_server();
1852 
1853   if(!err)
1854     /* We are no longer functional... */
1855     irnet_server.running = 1;
1856 
1857   DEXIT(MODULE_TRACE, "\n");
1858   return err;
1859 }
1860 
1861 /*------------------------------------------------------------------*/
1862 /*
1863  * Cleanup at exit...
1864  */
1865 void __exit
1866 irda_irnet_cleanup(void)
1867 {
1868   DENTER(MODULE_TRACE, "()\n");
1869 
1870   /* We are no longer there... */
1871   irnet_server.running = 0;
1872 
1873 #ifdef CONFIG_PROC_FS
1874   /* Remove our /proc file */
1875   remove_proc_entry("irnet", proc_irda);
1876 #endif /* CONFIG_PROC_FS */
1877 
1878   /* Remove our IrNET server from existence */
1879   irnet_destroy_server();
1880 
1881   /* Remove all instances of IrNET socket still present */
1882   hashbin_delete(irnet_server.list, (FREE_FUNC) irda_irnet_destroy);
1883 
1884   DEXIT(MODULE_TRACE, "\n");
1885 }
1886 

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