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   1 /*********************************************************************
   2  *
   3  * Filename:      irlmp_event.c
   4  * Version:       0.8
   5  * Description:   An IrDA LMP event driver for Linux
   6  * Status:        Experimental.
   7  * Author:        Dag Brattli <dagb@cs.uit.no>
   8  * Created at:    Mon Aug  4 20:40:53 1997
   9  * Modified at:   Tue Dec 14 23:04:16 1999
  10  * Modified by:   Dag Brattli <dagb@cs.uit.no>
  11  *
  12  *     Copyright (c) 1998-1999 Dag Brattli <dagb@cs.uit.no>,
  13  *     All Rights Reserved.
  14  *     Copyright (c) 2000-2003 Jean Tourrilhes <jt@hpl.hp.com>
  15  *
  16  *     This program is free software; you can redistribute it and/or
  17  *     modify it under the terms of the GNU General Public License as
  18  *     published by the Free Software Foundation; either version 2 of
  19  *     the License, or (at your option) any later version.
  20  *
  21  *     Neither Dag Brattli nor University of Tromsø admit liability nor
  22  *     provide warranty for any of this software. This material is
  23  *     provided "AS-IS" and at no charge.
  24  *
  25  ********************************************************************/
  26
  27 #include <linux/kernel.h>
  28
  29 #include <net/irda/irda.h>
  30 #include <net/irda/timer.h>
  31 #include <net/irda/irlap.h>
  32 #include <net/irda/irlmp.h>
  33 #include <net/irda/irlmp_frame.h>
  34 #include <net/irda/irlmp_event.h>
  35
  36 const char *irlmp_state[] = {
  37         "LAP_STANDBY",
  38         "LAP_U_CONNECT",
  39         "LAP_ACTIVE",
  40 };
  41
  42 const char *irlsap_state[] = {
  43         "LSAP_DISCONNECTED",
  44         "LSAP_CONNECT",
  45         "LSAP_CONNECT_PEND",
  46         "LSAP_DATA_TRANSFER_READY",
  47         "LSAP_SETUP",
  48         "LSAP_SETUP_PEND",
  49 };
  50
  51 #ifdef CONFIG_IRDA_DEBUG
  52 static const char *irlmp_event[] = {
  53         "LM_CONNECT_REQUEST",
  54         "LM_CONNECT_CONFIRM",
  55         "LM_CONNECT_RESPONSE",
  56         "LM_CONNECT_INDICATION",
  57
  58         "LM_DISCONNECT_INDICATION",
  59         "LM_DISCONNECT_REQUEST",
  60
  61         "LM_DATA_REQUEST",
  62         "LM_UDATA_REQUEST",
  63         "LM_DATA_INDICATION",
  64         "LM_UDATA_INDICATION",
  65
  66         "LM_WATCHDOG_TIMEOUT",
  67
  68         /* IrLAP events */
  69         "LM_LAP_CONNECT_REQUEST",
  70         "LM_LAP_CONNECT_INDICATION",
  71         "LM_LAP_CONNECT_CONFIRM",
  72         "LM_LAP_DISCONNECT_INDICATION",
  73         "LM_LAP_DISCONNECT_REQUEST",
  74         "LM_LAP_DISCOVERY_REQUEST",
  75         "LM_LAP_DISCOVERY_CONFIRM",
  76         "LM_LAP_IDLE_TIMEOUT",
  77 };
  78 #endif  /* CONFIG_IRDA_DEBUG */
  79
  80 /* LAP Connection control proto declarations */
  81 static void irlmp_state_standby  (struct lap_cb *, IRLMP_EVENT,
  82                                   struct sk_buff *);
  83 static void irlmp_state_u_connect(struct lap_cb *, IRLMP_EVENT,
  84                                   struct sk_buff *);
  85 static void irlmp_state_active   (struct lap_cb *, IRLMP_EVENT,
  86                                   struct sk_buff *);
  87
  88 /* LSAP Connection control proto declarations */
  89 static int irlmp_state_disconnected(struct lsap_cb *, IRLMP_EVENT,
  90                                     struct sk_buff *);
  91 static int irlmp_state_connect     (struct lsap_cb *, IRLMP_EVENT,
  92                                     struct sk_buff *);
  93 static int irlmp_state_connect_pend(struct lsap_cb *, IRLMP_EVENT,
  94                                     struct sk_buff *);
  95 static int irlmp_state_dtr         (struct lsap_cb *, IRLMP_EVENT,
  96                                     struct sk_buff *);
  97 static int irlmp_state_setup       (struct lsap_cb *, IRLMP_EVENT,
  98                                     struct sk_buff *);
  99 static int irlmp_state_setup_pend  (struct lsap_cb *, IRLMP_EVENT,
 100                                     struct sk_buff *);
 101
 102 static void (*lap_state[]) (struct lap_cb *, IRLMP_EVENT, struct sk_buff *) =
 103 {
 104         irlmp_state_standby,
 105         irlmp_state_u_connect,
 106         irlmp_state_active,
 107 };
 108
 109 static int (*lsap_state[])( struct lsap_cb *, IRLMP_EVENT, struct sk_buff *) =
 110 {
 111         irlmp_state_disconnected,
 112         irlmp_state_connect,
 113         irlmp_state_connect_pend,
 114         irlmp_state_dtr,
 115         irlmp_state_setup,
 116         irlmp_state_setup_pend
 117 };
 118
 119 static inline void irlmp_next_lap_state(struct lap_cb *self,
 120                                         IRLMP_STATE state)
 121 {
 122         /*
 123         IRDA_DEBUG(4, "%s(), LMP LAP = %s\n", __FUNCTION__, irlmp_state[state]);
 124         */
 125         self->lap_state = state;
 126 }
 127
 128 static inline void irlmp_next_lsap_state(struct lsap_cb *self,
 129                                          LSAP_STATE state)
 130 {
 131         /*
 132         IRDA_ASSERT(self != NULL, return;);
 133         IRDA_DEBUG(4, "%s(), LMP LSAP = %s\n", __FUNCTION__, irlsap_state[state]);
 134         */
 135         self->lsap_state = state;
 136 }
 137
 138 /* Do connection control events */
 139 int irlmp_do_lsap_event(struct lsap_cb *self, IRLMP_EVENT event,
 140                         struct sk_buff *skb)
 141 {
 142         IRDA_ASSERT(self != NULL, return -1;);
 143         IRDA_ASSERT(self->magic == LMP_LSAP_MAGIC, return -1;);
 144
 145         IRDA_DEBUG(4, "%s(), EVENT = %s, STATE = %s\n",
 146                 __FUNCTION__, irlmp_event[event], irlsap_state[ self->lsap_state]);
 147
 148         return (*lsap_state[self->lsap_state]) (self, event, skb);
 149 }
 150
 151 /*
 152  * Function do_lap_event (event, skb, info)
 153  *
 154  *    Do IrLAP control events
 155  *
 156  */
 157 void irlmp_do_lap_event(struct lap_cb *self, IRLMP_EVENT event,
 158                         struct sk_buff *skb)
 159 {
 160         IRDA_ASSERT(self != NULL, return;);
 161         IRDA_ASSERT(self->magic == LMP_LAP_MAGIC, return;);
 162
 163         IRDA_DEBUG(4, "%s(), EVENT = %s, STATE = %s\n", __FUNCTION__,
 164                    irlmp_event[event],
 165                    irlmp_state[self->lap_state]);
 166
 167         (*lap_state[self->lap_state]) (self, event, skb);
 168 }
 169
 170 void irlmp_discovery_timer_expired(void *data)
 171 {
 172         IRDA_DEBUG(4, "%s()\n", __FUNCTION__);
 173
 174         /* We always cleanup the log (active & passive discovery) */
 175         irlmp_do_expiry();
 176
 177         /* Active discovery is conditional */
 178         if (sysctl_discovery)
 179                 irlmp_do_discovery(sysctl_discovery_slots);
 180
 181         /* Restart timer */
 182         irlmp_start_discovery_timer(irlmp, sysctl_discovery_timeout * HZ);
 183 }
 184
 185 void irlmp_watchdog_timer_expired(void *data)
 186 {
 187         struct lsap_cb *self = (struct lsap_cb *) data;
 188
 189         IRDA_DEBUG(2, "%s()\n", __FUNCTION__);
 190
 191         IRDA_ASSERT(self != NULL, return;);
 192         IRDA_ASSERT(self->magic == LMP_LSAP_MAGIC, return;);
 193
 194         irlmp_do_lsap_event(self, LM_WATCHDOG_TIMEOUT, NULL);
 195 }
 196
 197 void irlmp_idle_timer_expired(void *data)
 198 {
 199         struct lap_cb *self = (struct lap_cb *) data;
 200
 201         IRDA_DEBUG(2, "%s()\n", __FUNCTION__);
 202
 203         IRDA_ASSERT(self != NULL, return;);
 204         IRDA_ASSERT(self->magic == LMP_LAP_MAGIC, return;);
 205
 206         irlmp_do_lap_event(self, LM_LAP_IDLE_TIMEOUT, NULL);
 207 }
 208
 209 /*
 210  * Send an event on all LSAPs attached to this LAP.
 211  */
 212 static inline void
 213 irlmp_do_all_lsap_event(hashbin_t *     lsap_hashbin,
 214                         IRLMP_EVENT     event)
 215 {
 216         struct lsap_cb *lsap;
 217         struct lsap_cb *lsap_next;
 218
 219         /* Note : this function use the new hashbin_find_next()
 220          * function, instead of the old hashbin_get_next().
 221          * This make sure that we are always pointing one lsap
 222          * ahead, so that if the current lsap is removed as the
 223          * result of sending the event, we don't care.
 224          * Also, as we store the context ourselves, if an enumeration
 225          * of the same lsap hashbin happens as the result of sending the
 226          * event, we don't care.
 227          * The only problem is if the next lsap is removed. In that case,
 228          * hashbin_find_next() will return NULL and we will abort the
 229          * enumeration. - Jean II */
 230
 231         /* Also : we don't accept any skb in input. We can *NOT* pass
 232          * the same skb to multiple clients safely, we would need to
 233          * skb_clone() it. - Jean II */
 234
 235         lsap = (struct lsap_cb *) hashbin_get_first(lsap_hashbin);
 236
 237         while (NULL != hashbin_find_next(lsap_hashbin,
 238                                          (long) lsap,
 239                                          NULL,
 240                                          (void *) &lsap_next) ) {
 241                 irlmp_do_lsap_event(lsap, event, NULL);
 242                 lsap = lsap_next;
 243         }
 244 }
 245
 246 /*********************************************************************
 247  *
 248  *    LAP connection control states
 249  *
 250  ********************************************************************/
 251
 252 /*
 253  * Function irlmp_state_standby (event, skb, info)
 254  *
 255  *    STANDBY, The IrLAP connection does not exist.
 256  *
 257  */
 258 static void irlmp_state_standby(struct lap_cb *self, IRLMP_EVENT event,
 259                                 struct sk_buff *skb)
 260 {
 261         IRDA_DEBUG(4, "%s()\n", __FUNCTION__);
 262         IRDA_ASSERT(self->irlap != NULL, return;);
 263
 264         switch (event) {
 265         case LM_LAP_DISCOVERY_REQUEST:
 266                 /* irlmp_next_station_state( LMP_DISCOVER); */
 267
 268                 irlap_discovery_request(self->irlap, &irlmp->discovery_cmd);
 269                 break;
 270         case LM_LAP_CONNECT_INDICATION:
 271                 /*  It's important to switch state first, to avoid IrLMP to
 272                  *  think that the link is free since IrLMP may then start
 273                  *  discovery before the connection is properly set up. DB.
 274                  */
 275                 irlmp_next_lap_state(self, LAP_ACTIVE);
 276
 277                 /* Just accept connection TODO, this should be fixed */
 278                 irlap_connect_response(self->irlap, skb);
 279                 break;
 280         case LM_LAP_CONNECT_REQUEST:
 281                 IRDA_DEBUG(4, "%s() LS_CONNECT_REQUEST\n", __FUNCTION__);
 282
 283                 irlmp_next_lap_state(self, LAP_U_CONNECT);
 284
 285                 /* FIXME: need to set users requested QoS */
 286                 irlap_connect_request(self->irlap, self->daddr, NULL, 0);
 287                 break;
 288         case LM_LAP_DISCONNECT_INDICATION:
 289                 IRDA_DEBUG(4, "%s(), Error LM_LAP_DISCONNECT_INDICATION\n",
 290                            __FUNCTION__);
 291
 292                 irlmp_next_lap_state(self, LAP_STANDBY);
 293                 break;
 294         default:
 295                 IRDA_DEBUG(0, "%s(), Unknown event %s\n",
 296                            __FUNCTION__, irlmp_event[event]);
 297                 break;
 298         }
 299 }
 300
 301 /*
 302  * Function irlmp_state_u_connect (event, skb, info)
 303  *
 304  *    U_CONNECT, The layer above has tried to open an LSAP connection but
 305  *    since the IrLAP connection does not exist, we must first start an
 306  *    IrLAP connection. We are now waiting response from IrLAP.
 307  * */
 308 static void irlmp_state_u_connect(struct lap_cb *self, IRLMP_EVENT event,
 309                                   struct sk_buff *skb)
 310 {
 311         IRDA_DEBUG(2, "%s(), event=%s\n", __FUNCTION__, irlmp_event[event]);
 312
 313         switch (event) {
 314         case LM_LAP_CONNECT_INDICATION:
 315                 /*  It's important to switch state first, to avoid IrLMP to
 316                  *  think that the link is free since IrLMP may then start
 317                  *  discovery before the connection is properly set up. DB.
 318                  */
 319                 irlmp_next_lap_state(self, LAP_ACTIVE);
 320
 321                 /* Just accept connection TODO, this should be fixed */
 322                 irlap_connect_response(self->irlap, skb);
 323
 324                 /* Tell LSAPs that they can start sending data */
 325                 irlmp_do_all_lsap_event(self->lsaps, LM_LAP_CONNECT_CONFIRM);
 326
 327                 /* Note : by the time we get there (LAP retries and co),
 328                  * the lsaps may already have gone. This avoid getting stuck
 329                  * forever in LAP_ACTIVE state - Jean II */
 330                 if (HASHBIN_GET_SIZE(self->lsaps) == 0) {
 331                         IRDA_DEBUG(0, "%s() NO LSAPs !\n",  __FUNCTION__);
 332                         irlmp_start_idle_timer(self, LM_IDLE_TIMEOUT);
 333                 }
 334                 break;
 335         case LM_LAP_CONNECT_REQUEST:
 336                 /* Already trying to connect */
 337                 break;
 338         case LM_LAP_CONNECT_CONFIRM:
 339                 /* For all lsap_ce E Associated do LS_Connect_confirm */
 340                 irlmp_next_lap_state(self, LAP_ACTIVE);
 341
 342                 /* Tell LSAPs that they can start sending data */
 343                 irlmp_do_all_lsap_event(self->lsaps, LM_LAP_CONNECT_CONFIRM);
 344
 345                 /* Note : by the time we get there (LAP retries and co),
 346                  * the lsaps may already have gone. This avoid getting stuck
 347                  * forever in LAP_ACTIVE state - Jean II */
 348                 if (HASHBIN_GET_SIZE(self->lsaps) == 0) {
 349                         IRDA_DEBUG(0, "%s() NO LSAPs !\n",  __FUNCTION__);
 350                         irlmp_start_idle_timer(self, LM_IDLE_TIMEOUT);
 351                 }
 352                 break;
 353         case LM_LAP_DISCONNECT_INDICATION:
 354                 IRDA_DEBUG(4, "%s(), LM_LAP_DISCONNECT_INDICATION\n",  __FUNCTION__);
 355                 irlmp_next_lap_state(self, LAP_STANDBY);
 356
 357                 /* Send disconnect event to all LSAPs using this link */
 358                 irlmp_do_all_lsap_event(self->lsaps,
 359                                         LM_LAP_DISCONNECT_INDICATION);
 360                 break;
 361         case LM_LAP_DISCONNECT_REQUEST:
 362                 IRDA_DEBUG(4, "%s(), LM_LAP_DISCONNECT_REQUEST\n",  __FUNCTION__);
 363
 364                 /* One of the LSAP did timeout or was closed, if it was
 365                  * the last one, try to get out of here - Jean II */
 366                 if (HASHBIN_GET_SIZE(self->lsaps) <= 1) {
 367                         irlap_disconnect_request(self->irlap);
 368                 }
 369                 break;
 370         default:
 371                 IRDA_DEBUG(0, "%s(), Unknown event %s\n",
 372                          __FUNCTION__, irlmp_event[event]);
 373                 break;
 374         }
 375 }
 376
 377 /*
 378  * Function irlmp_state_active (event, skb, info)
 379  *
 380  *    ACTIVE, IrLAP connection is active
 381  *
 382  */
 383 static void irlmp_state_active(struct lap_cb *self, IRLMP_EVENT event,
 384                                struct sk_buff *skb)
 385 {
 386         IRDA_DEBUG(4, "%s()\n", __FUNCTION__);
 387
 388         switch (event) {
 389         case LM_LAP_CONNECT_REQUEST:
 390                 IRDA_DEBUG(4, "%s(), LS_CONNECT_REQUEST\n", __FUNCTION__);
 391
 392                 /*
 393                  * IrLAP may have a pending disconnect. We tried to close
 394                  * IrLAP, but it was postponed because the link was
 395                  * busy or we were still sending packets. As we now
 396                  * need it, make sure it stays on. Jean II
 397                  */
 398                 irlap_clear_disconnect(self->irlap);
 399
 400                 /*
 401                  *  LAP connection already active, just bounce back! Since we
 402                  *  don't know which LSAP that tried to do this, we have to
 403                  *  notify all LSAPs using this LAP, but that should be safe to
 404                  *  do anyway.
 405                  */
 406                 irlmp_do_all_lsap_event(self->lsaps, LM_LAP_CONNECT_CONFIRM);
 407
 408                 /* Needed by connect indication */
 409                 irlmp_do_all_lsap_event(irlmp->unconnected_lsaps,
 410                                         LM_LAP_CONNECT_CONFIRM);
 411                 /* Keep state */
 412                 break;
 413         case LM_LAP_DISCONNECT_REQUEST:
 414                 /*
 415                  *  Need to find out if we should close IrLAP or not. If there
 416                  *  is only one LSAP connection left on this link, that LSAP
 417                  *  must be the one that tries to close IrLAP. It will be
 418                  *  removed later and moved to the list of unconnected LSAPs
 419                  */
 420                 if (HASHBIN_GET_SIZE(self->lsaps) > 0) {
 421                         /* Timer value is checked in irsysctl - Jean II */
 422                         irlmp_start_idle_timer(self, sysctl_lap_keepalive_time * HZ / 1000);
 423                 } else {
 424                         /* No more connections, so close IrLAP */
 425
 426                         /* We don't want to change state just yet, because
 427                          * we want to reflect accurately the real state of
 428                          * the LAP, not the state we wish it was in,
 429                          * so that we don't lose LM_LAP_CONNECT_REQUEST.
 430                          * In some cases, IrLAP won't close the LAP
 431                          * immediately. For example, it might still be
 432                          * retrying packets or waiting for the pf bit.
 433                          * As the LAP always send a DISCONNECT_INDICATION
 434                          * in PCLOSE or SCLOSE, just change state on that.
 435                          * Jean II */
 436                         irlap_disconnect_request(self->irlap);
 437                 }
 438                 break;
 439         case LM_LAP_IDLE_TIMEOUT:
 440                 if (HASHBIN_GET_SIZE(self->lsaps) == 0) {
 441                         /* Same reasoning as above - keep state */
 442                         irlap_disconnect_request(self->irlap);
 443                 }
 444                 break;
 445         case LM_LAP_DISCONNECT_INDICATION:
 446                 irlmp_next_lap_state(self, LAP_STANDBY);
 447
 448                 /* In some case, at this point our side has already closed
 449                  * all lsaps, and we are waiting for the idle_timer to
 450                  * expire. If another device reconnect immediately, the
 451                  * idle timer will expire in the midle of the connection
 452                  * initialisation, screwing up things a lot...
 453                  * Therefore, we must stop the timer... */
 454                 irlmp_stop_idle_timer(self);
 455
 456                 /*
 457                  *  Inform all connected LSAP's using this link
 458                  */
 459                 irlmp_do_all_lsap_event(self->lsaps,
 460                                         LM_LAP_DISCONNECT_INDICATION);
 461
 462                 /* Force an expiry of the discovery log.
 463                  * Now that the LAP is free, the system may attempt to
 464                  * connect to another device. Unfortunately, our entries
 465                  * are stale. There is a small window (<3s) before the
 466                  * normal discovery will run and where irlmp_connect_request()
 467                  * can get the wrong info, so make sure things get
 468                  * cleaned *NOW* ;-) - Jean II */
 469                 irlmp_do_expiry();
 470                 break;
 471         default:
 472                 IRDA_DEBUG(0, "%s(), Unknown event %s\n",
 473                          __FUNCTION__, irlmp_event[event]);
 474                 break;
 475         }
 476 }
 477
 478 /*********************************************************************
 479  *
 480  *    LSAP connection control states
 481  *
 482  ********************************************************************/
 483
 484 /*
 485  * Function irlmp_state_disconnected (event, skb, info)
 486  *
 487  *    DISCONNECTED
 488  *
 489  */
 490 static int irlmp_state_disconnected(struct lsap_cb *self, IRLMP_EVENT event,
 491                                     struct sk_buff *skb)
 492 {
 493         int ret = 0;
 494
 495         IRDA_DEBUG(4, "%s()\n", __FUNCTION__);
 496
 497         IRDA_ASSERT(self != NULL, return -1;);
 498         IRDA_ASSERT(self->magic == LMP_LSAP_MAGIC, return -1;);
 499
 500         switch (event) {
 501 #ifdef CONFIG_IRDA_ULTRA
 502         case LM_UDATA_INDICATION:
 503                 /* This is most bizzare. Those packets are  aka unreliable
 504                  * connected, aka IrLPT or SOCK_DGRAM/IRDAPROTO_UNITDATA.
 505                  * Why do we pass them as Ultra ??? Jean II */
 506                 irlmp_connless_data_indication(self, skb);
 507                 break;
 508 #endif /* CONFIG_IRDA_ULTRA */
 509         case LM_CONNECT_REQUEST:
 510                 IRDA_DEBUG(4, "%s(), LM_CONNECT_REQUEST\n", __FUNCTION__);
 511
 512                 if (self->conn_skb) {
 513                         IRDA_WARNING("%s: busy with another request!\n",
 514                                      __FUNCTION__);
 515                         return -EBUSY;
 516                 }
 517                 /* Don't forget to refcount it (see irlmp_connect_request()) */
 518                 skb_get(skb);
 519                 self->conn_skb = skb;
 520
 521                 irlmp_next_lsap_state(self, LSAP_SETUP_PEND);
 522
 523                 /* Start watchdog timer (5 secs for now) */
 524                 irlmp_start_watchdog_timer(self, 5*HZ);
 525
 526                 irlmp_do_lap_event(self->lap, LM_LAP_CONNECT_REQUEST, NULL);
 527                 break;
 528         case LM_CONNECT_INDICATION:
 529                 if (self->conn_skb) {
 530                         IRDA_WARNING("%s: busy with another request!\n",
 531                                      __FUNCTION__);
 532                         return -EBUSY;
 533                 }
 534                 /* Don't forget to refcount it (see irlap_driver_rcv()) */
 535                 skb_get(skb);
 536                 self->conn_skb = skb;
 537
 538                 irlmp_next_lsap_state(self, LSAP_CONNECT_PEND);
 539
 540                 /* Start watchdog timer
 541                  * This is not mentionned in the spec, but there is a rare
 542                  * race condition that can get the socket stuck.
 543                  * If we receive this event while our LAP is closing down,
 544                  * the LM_LAP_CONNECT_REQUEST get lost and we get stuck in
 545                  * CONNECT_PEND state forever.
 546                  * The other cause of getting stuck down there is if the
 547                  * higher layer never reply to the CONNECT_INDICATION.
 548                  * Anyway, it make sense to make sure that we always have
 549                  * a backup plan. 1 second is plenty (should be immediate).
 550                  * Jean II */
 551                 irlmp_start_watchdog_timer(self, 1*HZ);
 552
 553                 irlmp_do_lap_event(self->lap, LM_LAP_CONNECT_REQUEST, NULL);
 554                 break;
 555         default:
 556                 IRDA_DEBUG(1, "%s(), Unknown event %s on LSAP %#02x\n",
 557                            __FUNCTION__, irlmp_event[event], self->slsap_sel);
 558                 break;
 559         }
 560         return ret;
 561 }
 562
 563 /*
 564  * Function irlmp_state_connect (self, event, skb)
 565  *
 566  *    CONNECT
 567  *
 568  */
 569 static int irlmp_state_connect(struct lsap_cb *self, IRLMP_EVENT event,
 570                                 struct sk_buff *skb)
 571 {
 572         struct lsap_cb *lsap;
 573         int ret = 0;
 574
 575         IRDA_DEBUG(4, "%s()\n", __FUNCTION__);
 576
 577         IRDA_ASSERT(self != NULL, return -1;);
 578         IRDA_ASSERT(self->magic == LMP_LSAP_MAGIC, return -1;);
 579
 580         switch (event) {
 581         case LM_CONNECT_RESPONSE:
 582                 /*
 583                  *  Bind this LSAP to the IrLAP link where the connect was
 584                  *  received
 585                  */
 586                 lsap = hashbin_remove(irlmp->unconnected_lsaps, (long) self,
 587                                       NULL);
 588
 589                 IRDA_ASSERT(lsap == self, return -1;);
 590                 IRDA_ASSERT(self->lap != NULL, return -1;);
 591                 IRDA_ASSERT(self->lap->lsaps != NULL, return -1;);
 592
 593                 hashbin_insert(self->lap->lsaps, (irda_queue_t *) self,
 594                                (long) self, NULL);
 595
 596                 set_bit(0, &self->connected);   /* TRUE */
 597
 598                 irlmp_send_lcf_pdu(self->lap, self->dlsap_sel,
 599                                    self->slsap_sel, CONNECT_CNF, skb);
 600
 601                 del_timer(&self->watchdog_timer);
 602
 603                 irlmp_next_lsap_state(self, LSAP_DATA_TRANSFER_READY);
 604                 break;
 605         case LM_WATCHDOG_TIMEOUT:
 606                 /* May happen, who knows...
 607                  * Jean II */
 608                 IRDA_DEBUG(0, "%s() WATCHDOG_TIMEOUT!\n",  __FUNCTION__);
 609
 610                 /* Disconnect, get out... - Jean II */
 611                 self->lap = NULL;
 612                 self->dlsap_sel = LSAP_ANY;
 613                 irlmp_next_lsap_state(self, LSAP_DISCONNECTED);
 614                 break;
 615         default:
 616                 /* LM_LAP_DISCONNECT_INDICATION : Should never happen, we
 617                  * are *not* yet bound to the IrLAP link. Jean II */
 618                 IRDA_DEBUG(0, "%s(), Unknown event %s on LSAP %#02x\n",
 619                            __FUNCTION__, irlmp_event[event], self->slsap_sel);
 620                 break;
 621         }
 622         return ret;
 623 }
 624
 625 /*
 626  * Function irlmp_state_connect_pend (event, skb, info)
 627  *
 628  *    CONNECT_PEND
 629  *
 630  */
 631 static int irlmp_state_connect_pend(struct lsap_cb *self, IRLMP_EVENT event,
 632                                     struct sk_buff *skb)
 633 {
 634         struct sk_buff *tx_skb;
 635         int ret = 0;
 636
 637         IRDA_DEBUG(4, "%s()\n", __FUNCTION__);
 638
 639         IRDA_ASSERT(self != NULL, return -1;);
 640         IRDA_ASSERT(self->magic == LMP_LSAP_MAGIC, return -1;);
 641
 642         switch (event) {
 643         case LM_CONNECT_REQUEST:
 644                 /* Keep state */
 645                 break;
 646         case LM_CONNECT_RESPONSE:
 647                 IRDA_DEBUG(0, "%s(), LM_CONNECT_RESPONSE, "
 648                            "no indication issued yet\n",  __FUNCTION__);
 649                 /* Keep state */
 650                 break;
 651         case LM_DISCONNECT_REQUEST:
 652                 IRDA_DEBUG(0, "%s(), LM_DISCONNECT_REQUEST, "
 653                            "not yet bound to IrLAP connection\n",  __FUNCTION__);
 654                 /* Keep state */
 655                 break;
 656         case LM_LAP_CONNECT_CONFIRM:
 657                 IRDA_DEBUG(4, "%s(), LS_CONNECT_CONFIRM\n",  __FUNCTION__);
 658                 irlmp_next_lsap_state(self, LSAP_CONNECT);
 659
 660                 tx_skb = self->conn_skb;
 661                 self->conn_skb = NULL;
 662
 663                 irlmp_connect_indication(self, tx_skb);
 664                 /* Drop reference count - see irlmp_connect_indication(). */
 665                 dev_kfree_skb(tx_skb);
 666                 break;
 667         case LM_WATCHDOG_TIMEOUT:
 668                 /* Will happen in some rare cases because of a race condition.
 669                  * Just make sure we don't stay there forever...
 670                  * Jean II */
 671                 IRDA_DEBUG(0, "%s() WATCHDOG_TIMEOUT!\n",  __FUNCTION__);
 672
 673                 /* Go back to disconnected mode, keep the socket waiting */
 674                 self->lap = NULL;
 675                 self->dlsap_sel = LSAP_ANY;
 676                 if(self->conn_skb)
 677                         dev_kfree_skb(self->conn_skb);
 678                 self->conn_skb = NULL;
 679                 irlmp_next_lsap_state(self, LSAP_DISCONNECTED);
 680                 break;
 681         default:
 682                 /* LM_LAP_DISCONNECT_INDICATION : Should never happen, we
 683                  * are *not* yet bound to the IrLAP link. Jean II */
 684                 IRDA_DEBUG(0, "%s(), Unknown event %s on LSAP %#02x\n",
 685                            __FUNCTION__, irlmp_event[event], self->slsap_sel);
 686                 break;
 687         }
 688         return ret;
 689 }
 690
 691 /*
 692  * Function irlmp_state_dtr (self, event, skb)
 693  *
 694  *    DATA_TRANSFER_READY
 695  *
 696  */
 697 static int irlmp_state_dtr(struct lsap_cb *self, IRLMP_EVENT event,
 698                            struct sk_buff *skb)
 699 {
 700         LM_REASON reason;
 701         int ret = 0;
 702
 703         IRDA_DEBUG(4, "%s()\n", __FUNCTION__);
 704
 705         IRDA_ASSERT(self != NULL, return -1;);
 706         IRDA_ASSERT(self->magic == LMP_LSAP_MAGIC, return -1;);
 707         IRDA_ASSERT(self->lap != NULL, return -1;);
 708
 709         switch (event) {
 710         case LM_DATA_REQUEST: /* Optimize for the common case */
 711                 irlmp_send_data_pdu(self->lap, self->dlsap_sel,
 712                                     self->slsap_sel, FALSE, skb);
 713                 break;
 714         case LM_DATA_INDICATION: /* Optimize for the common case */
 715                 irlmp_data_indication(self, skb);
 716                 break;
 717         case LM_UDATA_REQUEST:
 718                 IRDA_ASSERT(skb != NULL, return -1;);
 719                 irlmp_send_data_pdu(self->lap, self->dlsap_sel,
 720                                     self->slsap_sel, TRUE, skb);
 721                 break;
 722         case LM_UDATA_INDICATION:
 723                 irlmp_udata_indication(self, skb);
 724                 break;
 725         case LM_CONNECT_REQUEST:
 726                 IRDA_DEBUG(0, "%s(), LM_CONNECT_REQUEST, "
 727                            "error, LSAP already connected\n", __FUNCTION__);
 728                 /* Keep state */
 729                 break;
 730         case LM_CONNECT_RESPONSE:
 731                 IRDA_DEBUG(0, "%s(), LM_CONNECT_RESPONSE, "
 732                            "error, LSAP already connected\n", __FUNCTION__);
 733                 /* Keep state */
 734                 break;
 735         case LM_DISCONNECT_REQUEST:
 736                 irlmp_send_lcf_pdu(self->lap, self->dlsap_sel, self->slsap_sel,
 737                                    DISCONNECT, skb);
 738                 irlmp_next_lsap_state(self, LSAP_DISCONNECTED);
 739                 /* Called only from irlmp_disconnect_request(), will
 740                  * unbind from LAP over there. Jean II */
 741
 742                 /* Try to close the LAP connection if its still there */
 743                 if (self->lap) {
 744                         IRDA_DEBUG(4, "%s(), trying to close IrLAP\n",
 745                                    __FUNCTION__);
 746                         irlmp_do_lap_event(self->lap,
 747                                            LM_LAP_DISCONNECT_REQUEST,
 748                                            NULL);
 749                 }
 750                 break;
 751         case LM_LAP_DISCONNECT_INDICATION:
 752                 irlmp_next_lsap_state(self, LSAP_DISCONNECTED);
 753
 754                 reason = irlmp_convert_lap_reason(self->lap->reason);
 755
 756                 irlmp_disconnect_indication(self, reason, NULL);
 757                 break;
 758         case LM_DISCONNECT_INDICATION:
 759                 irlmp_next_lsap_state(self, LSAP_DISCONNECTED);
 760
 761                 IRDA_ASSERT(self->lap != NULL, return -1;);
 762                 IRDA_ASSERT(self->lap->magic == LMP_LAP_MAGIC, return -1;);
 763
 764                 IRDA_ASSERT(skb != NULL, return -1;);
 765                 IRDA_ASSERT(skb->len > 3, return -1;);
 766                 reason = skb->data[3];
 767
 768                  /* Try to close the LAP connection */
 769                 IRDA_DEBUG(4, "%s(), trying to close IrLAP\n", __FUNCTION__);
 770                 irlmp_do_lap_event(self->lap, LM_LAP_DISCONNECT_REQUEST, NULL);
 771
 772                 irlmp_disconnect_indication(self, reason, skb);
 773                 break;
 774         default:
 775                 IRDA_DEBUG(0, "%s(), Unknown event %s on LSAP %#02x\n",
 776                            __FUNCTION__, irlmp_event[event], self->slsap_sel);
 777                 break;
 778         }
 779         return ret;
 780 }
 781
 782 /*
 783  * Function irlmp_state_setup (event, skb, info)
 784  *
 785  *    SETUP, Station Control has set up the underlying IrLAP connection.
 786  *    An LSAP connection request has been transmitted to the peer
 787  *    LSAP-Connection Control FSM and we are awaiting reply.
 788  */
 789 static int irlmp_state_setup(struct lsap_cb *self, IRLMP_EVENT event,
 790                              struct sk_buff *skb)
 791 {
 792         LM_REASON reason;
 793         int ret = 0;
 794
 795         IRDA_ASSERT(self != NULL, return -1;);
 796         IRDA_ASSERT(self->magic == LMP_LSAP_MAGIC, return -1;);
 797
 798         IRDA_DEBUG(4, "%s()\n", __FUNCTION__);
 799
 800         switch (event) {
 801         case LM_CONNECT_CONFIRM:
 802                 irlmp_next_lsap_state(self, LSAP_DATA_TRANSFER_READY);
 803
 804                 del_timer(&self->watchdog_timer);
 805
 806                 irlmp_connect_confirm(self, skb);
 807                 break;
 808         case LM_DISCONNECT_INDICATION:
 809                 irlmp_next_lsap_state(self, LSAP_DISCONNECTED);
 810
 811                 IRDA_ASSERT(self->lap != NULL, return -1;);
 812                 IRDA_ASSERT(self->lap->magic == LMP_LAP_MAGIC, return -1;);
 813
 814                 IRDA_ASSERT(skb != NULL, return -1;);
 815                 IRDA_ASSERT(skb->len > 3, return -1;);
 816                 reason = skb->data[3];
 817
 818                  /* Try to close the LAP connection */
 819                 IRDA_DEBUG(4, "%s(), trying to close IrLAP\n",  __FUNCTION__);
 820                 irlmp_do_lap_event(self->lap, LM_LAP_DISCONNECT_REQUEST, NULL);
 821
 822                 irlmp_disconnect_indication(self, reason, skb);
 823                 break;
 824         case LM_LAP_DISCONNECT_INDICATION:
 825                 irlmp_next_lsap_state(self, LSAP_DISCONNECTED);
 826
 827                 del_timer(&self->watchdog_timer);
 828
 829                 IRDA_ASSERT(self->lap != NULL, return -1;);
 830                 IRDA_ASSERT(self->lap->magic == LMP_LAP_MAGIC, return -1;);
 831
 832                 reason = irlmp_convert_lap_reason(self->lap->reason);
 833
 834                 irlmp_disconnect_indication(self, reason, skb);
 835                 break;
 836         case LM_WATCHDOG_TIMEOUT:
 837                 IRDA_DEBUG(0, "%s() WATCHDOG_TIMEOUT!\n", __FUNCTION__);
 838
 839                 IRDA_ASSERT(self->lap != NULL, return -1;);
 840                 irlmp_do_lap_event(self->lap, LM_LAP_DISCONNECT_REQUEST, NULL);
 841                 irlmp_next_lsap_state(self, LSAP_DISCONNECTED);
 842
 843                 irlmp_disconnect_indication(self, LM_CONNECT_FAILURE, NULL);
 844                 break;
 845         default:
 846                 IRDA_DEBUG(0, "%s(), Unknown event %s on LSAP %#02x\n",
 847                            __FUNCTION__, irlmp_event[event], self->slsap_sel);
 848                 break;
 849         }
 850         return ret;
 851 }
 852
 853 /*
 854  * Function irlmp_state_setup_pend (event, skb, info)
 855  *
 856  *    SETUP_PEND, An LM_CONNECT_REQUEST has been received from the service
 857  *    user to set up an LSAP connection. A request has been sent to the
 858  *    LAP FSM to set up the underlying IrLAP connection, and we
 859  *    are awaiting confirm.
 860  */
 861 static int irlmp_state_setup_pend(struct lsap_cb *self, IRLMP_EVENT event,
 862                                   struct sk_buff *skb)
 863 {
 864         struct sk_buff *tx_skb;
 865         LM_REASON reason;
 866         int ret = 0;
 867
 868         IRDA_DEBUG(4, "%s()\n", __FUNCTION__);
 869
 870         IRDA_ASSERT(self != NULL, return -1;);
 871         IRDA_ASSERT(irlmp != NULL, return -1;);
 872
 873         switch (event) {
 874         case LM_LAP_CONNECT_CONFIRM:
 875                 IRDA_ASSERT(self->conn_skb != NULL, return -1;);
 876
 877                 tx_skb = self->conn_skb;
 878                 self->conn_skb = NULL;
 879
 880                 irlmp_send_lcf_pdu(self->lap, self->dlsap_sel,
 881                                    self->slsap_sel, CONNECT_CMD, tx_skb);
 882                 /* Drop reference count - see irlap_data_request(). */
 883                 dev_kfree_skb(tx_skb);
 884
 885                 irlmp_next_lsap_state(self, LSAP_SETUP);
 886                 break;
 887         case LM_WATCHDOG_TIMEOUT:
 888                 IRDA_DEBUG(0, "%s() : WATCHDOG_TIMEOUT !\n",  __FUNCTION__);
 889
 890                 IRDA_ASSERT(self->lap != NULL, return -1;);
 891                 irlmp_do_lap_event(self->lap, LM_LAP_DISCONNECT_REQUEST, NULL);
 892                 irlmp_next_lsap_state(self, LSAP_DISCONNECTED);
 893
 894                 irlmp_disconnect_indication(self, LM_CONNECT_FAILURE, NULL);
 895                 break;
 896         case LM_LAP_DISCONNECT_INDICATION: /* LS_Disconnect.indication */
 897                 del_timer( &self->watchdog_timer);
 898
 899                 irlmp_next_lsap_state(self, LSAP_DISCONNECTED);
 900
 901                 reason = irlmp_convert_lap_reason(self->lap->reason);
 902
 903                 irlmp_disconnect_indication(self, reason, NULL);
 904                 break;
 905         default:
 906                 IRDA_DEBUG(0, "%s(), Unknown event %s on LSAP %#02x\n",
 907                            __FUNCTION__, irlmp_event[event], self->slsap_sel);
 908                 break;
 909         }
 910         return ret;
 911 }