net/irda/irlap.c

   1 /*********************************************************************
   2  *
   3  * Filename:      irlap.c
   4  * Version:       1.0
   5  * Description:   IrLAP implementation for Linux
   6  * Status:        Stable
   7  * Author:        Dag Brattli <dagb@cs.uit.no>
   8  * Created at:    Mon Aug  4 20:40:53 1997
   9  * Modified at:   Tue Dec 14 09:26:44 1999
  10  * Modified by:   Dag Brattli <dagb@cs.uit.no>
  11  *
  12  *     Copyright (c) 1998-1999 Dag Brattli, All Rights Reserved.
  13  *     Copyright (c) 2000-2003 Jean Tourrilhes <jt@hpl.hp.com>
  14  *
  15  *     This program is free software; you can redistribute it and/or
  16  *     modify it under the terms of the GNU General Public License as
  17  *     published by the Free Software Foundation; either version 2 of
  18  *     the License, or (at your option) any later version.
  19  *
  20  *     This program is distributed in the hope that it will be useful,
  21  *     but WITHOUT ANY WARRANTY; without even the implied warranty of
  22  *     MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
  23  *     GNU General Public License for more details.
  24  *
  25  *     You should have received a copy of the GNU General Public License
  26  *     along with this program; if not, write to the Free Software
  27  *     Foundation, Inc., 59 Temple Place, Suite 330, Boston,
  28  *     MA 02111-1307 USA
  29  *
  30  ********************************************************************/
  31
  32 #include <linux/slab.h>
  33 #include <linux/string.h>
  34 #include <linux/skbuff.h>
  35 #include <linux/delay.h>
  36 #include <linux/proc_fs.h>
  37 #include <linux/init.h>
  38 #include <linux/random.h>
  39 #include <linux/module.h>
  40 #include <linux/seq_file.h>
  41
  42 #include <net/irda/irda.h>
  43 #include <net/irda/irda_device.h>
  44 #include <net/irda/irqueue.h>
  45 #include <net/irda/irlmp.h>
  46 #include <net/irda/irlmp_frame.h>
  47 #include <net/irda/irlap_frame.h>
  48 #include <net/irda/irlap.h>
  49 #include <net/irda/timer.h>
  50 #include <net/irda/qos.h>
  51
  52 static hashbin_t *irlap = NULL;
  53 int sysctl_slot_timeout = SLOT_TIMEOUT * 1000 / HZ;
  54
  55 /* This is the delay of missed pf period before generating an event
  56  * to the application. The spec mandate 3 seconds, but in some cases
  57  * it's way too long. - Jean II */
  58 int sysctl_warn_noreply_time = 3;
  59
  60 extern void irlap_queue_xmit(struct irlap_cb *self, struct sk_buff *skb);
  61 static void __irlap_close(struct irlap_cb *self);
  62 static void irlap_init_qos_capabilities(struct irlap_cb *self,
  63                                         struct qos_info *qos_user);
  64
  65 #ifdef CONFIG_IRDA_DEBUG
  66 static const char *const lap_reasons[] = {
  67         "ERROR, NOT USED",
  68         "LAP_DISC_INDICATION",
  69         "LAP_NO_RESPONSE",
  70         "LAP_RESET_INDICATION",
  71         "LAP_FOUND_NONE",
  72         "LAP_MEDIA_BUSY",
  73         "LAP_PRIMARY_CONFLICT",
  74         "ERROR, NOT USED",
  75 };
  76 #endif  /* CONFIG_IRDA_DEBUG */
  77
  78 int __init irlap_init(void)
  79 {
  80         /* Check if the compiler did its job properly.
  81          * May happen on some ARM configuration, check with Russell King. */
  82         IRDA_ASSERT(sizeof(struct xid_frame) == 14, ;);
  83         IRDA_ASSERT(sizeof(struct test_frame) == 10, ;);
  84         IRDA_ASSERT(sizeof(struct ua_frame) == 10, ;);
  85         IRDA_ASSERT(sizeof(struct snrm_frame) == 11, ;);
  86
  87         /* Allocate master array */
  88         irlap = hashbin_new(HB_LOCK);
  89         if (irlap == NULL) {
  90                 IRDA_ERROR("%s: can't allocate irlap hashbin!\n",
  91                            __func__);
  92                 return -ENOMEM;
  93         }
  94
  95         return 0;
  96 }
  97
  98 void irlap_cleanup(void)
  99 {
 100         IRDA_ASSERT(irlap != NULL, return;);
 101
 102         hashbin_delete(irlap, (FREE_FUNC) __irlap_close);
 103 }
 104
 105 /*
 106  * Function irlap_open (driver)
 107  *
 108  *    Initialize IrLAP layer
 109  *
 110  */
 111 struct irlap_cb *irlap_open(struct net_device *dev, struct qos_info *qos,
 112                             const char *hw_name)
 113 {
 114         struct irlap_cb *self;
 115
 116         IRDA_DEBUG(4, "%s()\n", __func__);
 117
 118         /* Initialize the irlap structure. */
 119         self = kzalloc(sizeof(struct irlap_cb), GFP_KERNEL);
 120         if (self == NULL)
 121                 return NULL;
 122
 123         self->magic = LAP_MAGIC;
 124
 125         /* Make a binding between the layers */
 126         self->netdev = dev;
 127         self->qos_dev = qos;
 128         /* Copy hardware name */
 129         if(hw_name != NULL) {
 130                 strlcpy(self->hw_name, hw_name, sizeof(self->hw_name));
 131         } else {
 132                 self->hw_name[0] = '\0';
 133         }
 134
 135         /* FIXME: should we get our own field? */
 136         dev->atalk_ptr = self;
 137
 138         self->state = LAP_OFFLINE;
 139
 140         /* Initialize transmit queue */
 141         skb_queue_head_init(&self->txq);
 142         skb_queue_head_init(&self->txq_ultra);
 143         skb_queue_head_init(&self->wx_list);
 144
 145         /* My unique IrLAP device address! */
 146         /* We don't want the broadcast address, neither the NULL address
 147          * (most often used to signify "invalid"), and we don't want an
 148          * address already in use (otherwise connect won't be able
 149          * to select the proper link). - Jean II */
 150         do {
 151                 get_random_bytes(&self->saddr, sizeof(self->saddr));
 152         } while ((self->saddr == 0x0) || (self->saddr == BROADCAST) ||
 153                  (hashbin_lock_find(irlap, self->saddr, NULL)) );
 154         /* Copy to the driver */
 155         memcpy(dev->dev_addr, &self->saddr, 4);
 156
 157         init_timer(&self->slot_timer);
 158         init_timer(&self->query_timer);
 159         init_timer(&self->discovery_timer);
 160         init_timer(&self->final_timer);
 161         init_timer(&self->poll_timer);
 162         init_timer(&self->wd_timer);
 163         init_timer(&self->backoff_timer);
 164         init_timer(&self->media_busy_timer);
 165
 166         irlap_apply_default_connection_parameters(self);
 167
 168         self->N3 = 3; /* # connections attempts to try before giving up */
 169
 170         self->state = LAP_NDM;
 171
 172         hashbin_insert(irlap, (irda_queue_t *) self, self->saddr, NULL);
 173
 174         irlmp_register_link(self, self->saddr, &self->notify);
 175
 176         return self;
 177 }
 178 EXPORT_SYMBOL(irlap_open);
 179
 180 /*
 181  * Function __irlap_close (self)
 182  *
 183  *    Remove IrLAP and all allocated memory. Stop any pending timers.
 184  *
 185  */
 186 static void __irlap_close(struct irlap_cb *self)
 187 {
 188         IRDA_ASSERT(self != NULL, return;);
 189         IRDA_ASSERT(self->magic == LAP_MAGIC, return;);
 190
 191         /* Stop timers */
 192         del_timer(&self->slot_timer);
 193         del_timer(&self->query_timer);
 194         del_timer(&self->discovery_timer);
 195         del_timer(&self->final_timer);
 196         del_timer(&self->poll_timer);
 197         del_timer(&self->wd_timer);
 198         del_timer(&self->backoff_timer);
 199         del_timer(&self->media_busy_timer);
 200
 201         irlap_flush_all_queues(self);
 202
 203         self->magic = 0;
 204
 205         kfree(self);
 206 }
 207
 208 /*
 209  * Function irlap_close (self)
 210  *
 211  *    Remove IrLAP instance
 212  *
 213  */
 214 void irlap_close(struct irlap_cb *self)
 215 {
 216         struct irlap_cb *lap;
 217
 218         IRDA_DEBUG(4, "%s()\n", __func__);
 219
 220         IRDA_ASSERT(self != NULL, return;);
 221         IRDA_ASSERT(self->magic == LAP_MAGIC, return;);
 222
 223         /* We used to send a LAP_DISC_INDICATION here, but this was
 224          * racy. This has been move within irlmp_unregister_link()
 225          * itself. Jean II */
 226
 227         /* Kill the LAP and all LSAPs on top of it */
 228         irlmp_unregister_link(self->saddr);
 229         self->notify.instance = NULL;
 230
 231         /* Be sure that we manage to remove ourself from the hash */
 232         lap = hashbin_remove(irlap, self->saddr, NULL);
 233         if (!lap) {
 234                 IRDA_DEBUG(1, "%s(), Didn't find myself!\n", __func__);
 235                 return;
 236         }
 237         __irlap_close(lap);
 238 }
 239 EXPORT_SYMBOL(irlap_close);
 240
 241 /*
 242  * Function irlap_connect_indication (self, skb)
 243  *
 244  *    Another device is attempting to make a connection
 245  *
 246  */
 247 void irlap_connect_indication(struct irlap_cb *self, struct sk_buff *skb)
 248 {
 249         IRDA_DEBUG(4, "%s()\n", __func__);
 250
 251         IRDA_ASSERT(self != NULL, return;);
 252         IRDA_ASSERT(self->magic == LAP_MAGIC, return;);
 253
 254         irlap_init_qos_capabilities(self, NULL); /* No user QoS! */
 255
 256         irlmp_link_connect_indication(self->notify.instance, self->saddr,
 257                                       self->daddr, &self->qos_tx, skb);
 258 }
 259
 260 /*
 261  * Function irlap_connect_response (self, skb)
 262  *
 263  *    Service user has accepted incoming connection
 264  *
 265  */
 266 void irlap_connect_response(struct irlap_cb *self, struct sk_buff *userdata)
 267 {
 268         IRDA_DEBUG(4, "%s()\n", __func__);
 269
 270         irlap_do_event(self, CONNECT_RESPONSE, userdata, NULL);
 271 }
 272
 273 /*
 274  * Function irlap_connect_request (self, daddr, qos_user, sniff)
 275  *
 276  *    Request connection with another device, sniffing is not implemented
 277  *    yet.
 278  *
 279  */
 280 void irlap_connect_request(struct irlap_cb *self, __u32 daddr,
 281                            struct qos_info *qos_user, int sniff)
 282 {
 283         IRDA_DEBUG(3, "%s(), daddr=0x%08x\n", __func__, daddr);
 284
 285         IRDA_ASSERT(self != NULL, return;);
 286         IRDA_ASSERT(self->magic == LAP_MAGIC, return;);
 287
 288         self->daddr = daddr;
 289
 290         /*
 291          *  If the service user specifies QoS values for this connection,
 292          *  then use them
 293          */
 294         irlap_init_qos_capabilities(self, qos_user);
 295
 296         if ((self->state == LAP_NDM) && !self->media_busy)
 297                 irlap_do_event(self, CONNECT_REQUEST, NULL, NULL);
 298         else
 299                 self->connect_pending = TRUE;
 300 }
 301
 302 /*
 303  * Function irlap_connect_confirm (self, skb)
 304  *
 305  *    Connection request has been accepted
 306  *
 307  */
 308 void irlap_connect_confirm(struct irlap_cb *self, struct sk_buff *skb)
 309 {
 310         IRDA_DEBUG(4, "%s()\n", __func__);
 311
 312         IRDA_ASSERT(self != NULL, return;);
 313         IRDA_ASSERT(self->magic == LAP_MAGIC, return;);
 314
 315         irlmp_link_connect_confirm(self->notify.instance, &self->qos_tx, skb);
 316 }
 317
 318 /*
 319  * Function irlap_data_indication (self, skb)
 320  *
 321  *    Received data frames from IR-port, so we just pass them up to
 322  *    IrLMP for further processing
 323  *
 324  */
 325 void irlap_data_indication(struct irlap_cb *self, struct sk_buff *skb,
 326                            int unreliable)
 327 {
 328         /* Hide LAP header from IrLMP layer */
 329         skb_pull(skb, LAP_ADDR_HEADER+LAP_CTRL_HEADER);
 330
 331         irlmp_link_data_indication(self->notify.instance, skb, unreliable);
 332 }
 333
 334
 335 /*
 336  * Function irlap_data_request (self, skb)
 337  *
 338  *    Queue data for transmission, must wait until XMIT state
 339  *
 340  */
 341 void irlap_data_request(struct irlap_cb *self, struct sk_buff *skb,
 342                         int unreliable)
 343 {
 344         IRDA_ASSERT(self != NULL, return;);
 345         IRDA_ASSERT(self->magic == LAP_MAGIC, return;);
 346
 347         IRDA_DEBUG(3, "%s()\n", __func__);
 348
 349         IRDA_ASSERT(skb_headroom(skb) >= (LAP_ADDR_HEADER+LAP_CTRL_HEADER),
 350                     return;);
 351         skb_push(skb, LAP_ADDR_HEADER+LAP_CTRL_HEADER);
 352
 353         /*
 354          *  Must set frame format now so that the rest of the code knows
 355          *  if its dealing with an I or an UI frame
 356          */
 357         if (unreliable)
 358                 skb->data[1] = UI_FRAME;
 359         else
 360                 skb->data[1] = I_FRAME;
 361
 362         /* Don't forget to refcount it - see irlmp_connect_request(). */
 363         skb_get(skb);
 364
 365         /* Add at the end of the queue (keep ordering) - Jean II */
 366         skb_queue_tail(&self->txq, skb);
 367
 368         /*
 369          *  Send event if this frame only if we are in the right state
 370          *  FIXME: udata should be sent first! (skb_queue_head?)
 371          */
 372         if ((self->state == LAP_XMIT_P) || (self->state == LAP_XMIT_S)) {
 373                 /* If we are not already processing the Tx queue, trigger
 374                  * transmission immediately - Jean II */
 375                 if((skb_queue_len(&self->txq) <= 1) && (!self->local_busy))
 376                         irlap_do_event(self, DATA_REQUEST, skb, NULL);
 377                 /* Otherwise, the packets will be sent normally at the
 378                  * next pf-poll - Jean II */
 379         }
 380 }
 381
 382 /*
 383  * Function irlap_unitdata_request (self, skb)
 384  *
 385  *    Send Ultra data. This is data that must be sent outside any connection
 386  *
 387  */
 388 #ifdef CONFIG_IRDA_ULTRA
 389 void irlap_unitdata_request(struct irlap_cb *self, struct sk_buff *skb)
 390 {
 391         IRDA_ASSERT(self != NULL, return;);
 392         IRDA_ASSERT(self->magic == LAP_MAGIC, return;);
 393
 394         IRDA_DEBUG(3, "%s()\n", __func__);
 395
 396         IRDA_ASSERT(skb_headroom(skb) >= (LAP_ADDR_HEADER+LAP_CTRL_HEADER),
 397                return;);
 398         skb_push(skb, LAP_ADDR_HEADER+LAP_CTRL_HEADER);
 399
 400         skb->data[0] = CBROADCAST;
 401         skb->data[1] = UI_FRAME;
 402
 403         /* Don't need to refcount, see irlmp_connless_data_request() */
 404
 405         skb_queue_tail(&self->txq_ultra, skb);
 406
 407         irlap_do_event(self, SEND_UI_FRAME, NULL, NULL);
 408 }
 409 #endif /*CONFIG_IRDA_ULTRA */
 410
 411 /*
 412  * Function irlap_udata_indication (self, skb)
 413  *
 414  *    Receive Ultra data. This is data that is received outside any connection
 415  *
 416  */
 417 #ifdef CONFIG_IRDA_ULTRA
 418 void irlap_unitdata_indication(struct irlap_cb *self, struct sk_buff *skb)
 419 {
 420         IRDA_DEBUG(1, "%s()\n", __func__);
 421
 422         IRDA_ASSERT(self != NULL, return;);
 423         IRDA_ASSERT(self->magic == LAP_MAGIC, return;);
 424         IRDA_ASSERT(skb != NULL, return;);
 425
 426         /* Hide LAP header from IrLMP layer */
 427         skb_pull(skb, LAP_ADDR_HEADER+LAP_CTRL_HEADER);
 428
 429         irlmp_link_unitdata_indication(self->notify.instance, skb);
 430 }
 431 #endif /* CONFIG_IRDA_ULTRA */
 432
 433 /*
 434  * Function irlap_disconnect_request (void)
 435  *
 436  *    Request to disconnect connection by service user
 437  */
 438 void irlap_disconnect_request(struct irlap_cb *self)
 439 {
 440         IRDA_DEBUG(3, "%s()\n", __func__);
 441
 442         IRDA_ASSERT(self != NULL, return;);
 443         IRDA_ASSERT(self->magic == LAP_MAGIC, return;);
 444
 445         /* Don't disconnect until all data frames are successfully sent */
 446         if (!skb_queue_empty(&self->txq)) {
 447                 self->disconnect_pending = TRUE;
 448                 return;
 449         }
 450
 451         /* Check if we are in the right state for disconnecting */
 452         switch (self->state) {
 453         case LAP_XMIT_P:        /* FALLTHROUGH */
 454         case LAP_XMIT_S:        /* FALLTHROUGH */
 455         case LAP_CONN:          /* FALLTHROUGH */
 456         case LAP_RESET_WAIT:    /* FALLTHROUGH */
 457         case LAP_RESET_CHECK:
 458                 irlap_do_event(self, DISCONNECT_REQUEST, NULL, NULL);
 459                 break;
 460         default:
 461                 IRDA_DEBUG(2, "%s(), disconnect pending!\n", __func__);
 462                 self->disconnect_pending = TRUE;
 463                 break;
 464         }
 465 }
 466
 467 /*
 468  * Function irlap_disconnect_indication (void)
 469  *
 470  *    Disconnect request from other device
 471  *
 472  */
 473 void irlap_disconnect_indication(struct irlap_cb *self, LAP_REASON reason)
 474 {
 475         IRDA_DEBUG(1, "%s(), reason=%s\n", __func__, lap_reasons[reason]);
 476
 477         IRDA_ASSERT(self != NULL, return;);
 478         IRDA_ASSERT(self->magic == LAP_MAGIC, return;);
 479
 480         /* Flush queues */
 481         irlap_flush_all_queues(self);
 482
 483         switch (reason) {
 484         case LAP_RESET_INDICATION:
 485                 IRDA_DEBUG(1, "%s(), Sending reset request!\n", __func__);
 486                 irlap_do_event(self, RESET_REQUEST, NULL, NULL);
 487                 break;
 488         case LAP_NO_RESPONSE:      /* FALLTHROUGH */
 489         case LAP_DISC_INDICATION:  /* FALLTHROUGH */
 490         case LAP_FOUND_NONE:       /* FALLTHROUGH */
 491         case LAP_MEDIA_BUSY:
 492                 irlmp_link_disconnect_indication(self->notify.instance, self,
 493                                                  reason, NULL);
 494                 break;
 495         default:
 496                 IRDA_ERROR("%s: Unknown reason %d\n", __func__, reason);
 497         }
 498 }
 499
 500 /*
 501  * Function irlap_discovery_request (gen_addr_bit)
 502  *
 503  *    Start one single discovery operation.
 504  *
 505  */
 506 void irlap_discovery_request(struct irlap_cb *self, discovery_t *discovery)
 507 {
 508         struct irlap_info info;
 509
 510         IRDA_ASSERT(self != NULL, return;);
 511         IRDA_ASSERT(self->magic == LAP_MAGIC, return;);
 512         IRDA_ASSERT(discovery != NULL, return;);
 513
 514         IRDA_DEBUG(4, "%s(), nslots = %d\n", __func__, discovery->nslots);
 515
 516         IRDA_ASSERT((discovery->nslots == 1) || (discovery->nslots == 6) ||
 517                     (discovery->nslots == 8) || (discovery->nslots == 16),
 518                     return;);
 519
 520         /* Discovery is only possible in NDM mode */
 521         if (self->state != LAP_NDM) {
 522                 IRDA_DEBUG(4, "%s(), discovery only possible in NDM mode\n",
 523                            __func__);
 524                 irlap_discovery_confirm(self, NULL);
 525                 /* Note : in theory, if we are not in NDM, we could postpone
 526                  * the discovery like we do for connection request.
 527                  * In practice, it's not worth it. If the media was busy,
 528                  * it's likely next time around it won't be busy. If we are
 529                  * in REPLY state, we will get passive discovery info & event.
 530                  * Jean II */
 531                 return;
 532         }
 533
 534         /* Check if last discovery request finished in time, or if
 535          * it was aborted due to the media busy flag. */
 536         if (self->discovery_log != NULL) {
 537                 hashbin_delete(self->discovery_log, (FREE_FUNC) kfree);
 538                 self->discovery_log = NULL;
 539         }
 540
 541         /* All operations will occur at predictable time, no need to lock */
 542         self->discovery_log = hashbin_new(HB_NOLOCK);
 543
 544         if (self->discovery_log == NULL) {
 545                 IRDA_WARNING("%s(), Unable to allocate discovery log!\n",
 546                              __func__);
 547                 return;
 548         }
 549
 550         info.S = discovery->nslots; /* Number of slots */
 551         info.s = 0; /* Current slot */
 552
 553         self->discovery_cmd = discovery;
 554         info.discovery = discovery;
 555
 556         /* sysctl_slot_timeout bounds are checked in irsysctl.c - Jean II */
 557         self->slot_timeout = sysctl_slot_timeout * HZ / 1000;
 558
 559         irlap_do_event(self, DISCOVERY_REQUEST, NULL, &info);
 560 }
 561
 562 /*
 563  * Function irlap_discovery_confirm (log)
 564  *
 565  *    A device has been discovered in front of this station, we
 566  *    report directly to LMP.
 567  */
 568 void irlap_discovery_confirm(struct irlap_cb *self, hashbin_t *discovery_log)
 569 {
 570         IRDA_ASSERT(self != NULL, return;);
 571         IRDA_ASSERT(self->magic == LAP_MAGIC, return;);
 572
 573         IRDA_ASSERT(self->notify.instance != NULL, return;);
 574
 575         /*
 576          * Check for successful discovery, since we are then allowed to clear
 577          * the media busy condition (IrLAP 6.13.4 - p.94). This should allow
 578          * us to make connection attempts much faster and easier (i.e. no
 579          * collisions).
 580          * Setting media busy to false will also generate an event allowing
 581          * to process pending events in NDM state machine.
 582          * Note : the spec doesn't define what's a successful discovery is.
 583          * If we want Ultra to work, it's successful even if there is
 584          * nobody discovered - Jean II
 585          */
 586         if (discovery_log)
 587                 irda_device_set_media_busy(self->netdev, FALSE);
 588
 589         /* Inform IrLMP */
 590         irlmp_link_discovery_confirm(self->notify.instance, discovery_log);
 591 }
 592
 593 /*
 594  * Function irlap_discovery_indication (log)
 595  *
 596  *    Somebody is trying to discover us!
 597  *
 598  */
 599 void irlap_discovery_indication(struct irlap_cb *self, discovery_t *discovery)
 600 {
 601         IRDA_DEBUG(4, "%s()\n", __func__);
 602
 603         IRDA_ASSERT(self != NULL, return;);
 604         IRDA_ASSERT(self->magic == LAP_MAGIC, return;);
 605         IRDA_ASSERT(discovery != NULL, return;);
 606
 607         IRDA_ASSERT(self->notify.instance != NULL, return;);
 608
 609         /* A device is very likely to connect immediately after it performs
 610          * a successful discovery. This means that in our case, we are much
 611          * more likely to receive a connection request over the medium.
 612          * So, we backoff to avoid collisions.
 613          * IrLAP spec 6.13.4 suggest 100ms...
 614          * Note : this little trick actually make a *BIG* difference. If I set
 615          * my Linux box with discovery enabled and one Ultra frame sent every
 616          * second, my Palm has no trouble connecting to it every time !
 617          * Jean II */
 618         irda_device_set_media_busy(self->netdev, SMALL);
 619
 620         irlmp_link_discovery_indication(self->notify.instance, discovery);
 621 }
 622
 623 /*
 624  * Function irlap_status_indication (quality_of_link)
 625  */
 626 void irlap_status_indication(struct irlap_cb *self, int quality_of_link)
 627 {
 628         switch (quality_of_link) {
 629         case STATUS_NO_ACTIVITY:
 630                 IRDA_MESSAGE("IrLAP, no activity on link!\n");
 631                 break;
 632         case STATUS_NOISY:
 633                 IRDA_MESSAGE("IrLAP, noisy link!\n");
 634                 break;
 635         default:
 636                 break;
 637         }
 638         irlmp_status_indication(self->notify.instance,
 639                                 quality_of_link, LOCK_NO_CHANGE);
 640 }
 641
 642 /*
 643  * Function irlap_reset_indication (void)
 644  */
 645 void irlap_reset_indication(struct irlap_cb *self)
 646 {
 647         IRDA_DEBUG(1, "%s()\n", __func__);
 648
 649         IRDA_ASSERT(self != NULL, return;);
 650         IRDA_ASSERT(self->magic == LAP_MAGIC, return;);
 651
 652         if (self->state == LAP_RESET_WAIT)
 653                 irlap_do_event(self, RESET_REQUEST, NULL, NULL);
 654         else
 655                 irlap_do_event(self, RESET_RESPONSE, NULL, NULL);
 656 }
 657
 658 /*
 659  * Function irlap_reset_confirm (void)
 660  */
 661 void irlap_reset_confirm(void)
 662 {
 663         IRDA_DEBUG(1, "%s()\n", __func__);
 664 }
 665
 666 /*
 667  * Function irlap_generate_rand_time_slot (S, s)
 668  *
 669  *    Generate a random time slot between s and S-1 where
 670  *    S = Number of slots (0 -> S-1)
 671  *    s = Current slot
 672  */
 673 int irlap_generate_rand_time_slot(int S, int s)
 674 {
 675         static int rand;
 676         int slot;
 677
 678         IRDA_ASSERT((S - s) > 0, return 0;);
 679
 680         rand += jiffies;
 681         rand ^= (rand << 12);
 682         rand ^= (rand >> 20);
 683
 684         slot = s + rand % (S-s);
 685
 686         IRDA_ASSERT((slot >= s) || (slot < S), return 0;);
 687
 688         return slot;
 689 }
 690
 691 /*
 692  * Function irlap_update_nr_received (nr)
 693  *
 694  *    Remove all acknowledged frames in current window queue. This code is
 695  *    not intuitive and you should not try to change it. If you think it
 696  *    contains bugs, please mail a patch to the author instead.
 697  */
 698 void irlap_update_nr_received(struct irlap_cb *self, int nr)
 699 {
 700         struct sk_buff *skb = NULL;
 701         int count = 0;
 702
 703         /*
 704          * Remove all the ack-ed frames from the window queue.
 705          */
 706
 707         /*
 708          *  Optimize for the common case. It is most likely that the receiver
 709          *  will acknowledge all the frames we have sent! So in that case we
 710          *  delete all frames stored in window.
 711          */
 712         if (nr == self->vs) {
 713                 while ((skb = skb_dequeue(&self->wx_list)) != NULL) {
 714                         dev_kfree_skb(skb);
 715                 }
 716                 /* The last acked frame is the next to send minus one */
 717                 self->va = nr - 1;
 718         } else {
 719                 /* Remove all acknowledged frames in current window */
 720                 while ((skb_peek(&self->wx_list) != NULL) &&
 721                        (((self->va+1) % 8) != nr))
 722                 {
 723                         skb = skb_dequeue(&self->wx_list);
 724                         dev_kfree_skb(skb);
 725
 726                         self->va = (self->va + 1) % 8;
 727                         count++;
 728                 }
 729         }
 730
 731         /* Advance window */
 732         self->window = self->window_size - skb_queue_len(&self->wx_list);
 733 }
 734
 735 /*
 736  * Function irlap_validate_ns_received (ns)
 737  *
 738  *    Validate the next to send (ns) field from received frame.
 739  */
 740 int irlap_validate_ns_received(struct irlap_cb *self, int ns)
 741 {
 742         /*  ns as expected?  */
 743         if (ns == self->vr)
 744                 return NS_EXPECTED;
 745         /*
 746          *  Stations are allowed to treat invalid NS as unexpected NS
 747          *  IrLAP, Recv ... with-invalid-Ns. p. 84
 748          */
 749         return NS_UNEXPECTED;
 750
 751         /* return NR_INVALID; */
 752 }
 753 /*
 754  * Function irlap_validate_nr_received (nr)
 755  *
 756  *    Validate the next to receive (nr) field from received frame.
 757  *
 758  */
 759 int irlap_validate_nr_received(struct irlap_cb *self, int nr)
 760 {
 761         /*  nr as expected?  */
 762         if (nr == self->vs) {
 763                 IRDA_DEBUG(4, "%s(), expected!\n", __func__);
 764                 return NR_EXPECTED;
 765         }
 766
 767         /*
 768          *  unexpected nr? (but within current window), first we check if the
 769          *  ns numbers of the frames in the current window wrap.
 770          */
 771         if (self->va < self->vs) {
 772                 if ((nr >= self->va) && (nr <= self->vs))
 773                         return NR_UNEXPECTED;
 774         } else {
 775                 if ((nr >= self->va) || (nr <= self->vs))
 776                         return NR_UNEXPECTED;
 777         }
 778
 779         /* Invalid nr!  */
 780         return NR_INVALID;
 781 }
 782
 783 /*
 784  * Function irlap_initiate_connection_state ()
 785  *
 786  *    Initialize the connection state parameters
 787  *
 788  */
 789 void irlap_initiate_connection_state(struct irlap_cb *self)
 790 {
 791         IRDA_DEBUG(4, "%s()\n", __func__);
 792
 793         IRDA_ASSERT(self != NULL, return;);
 794         IRDA_ASSERT(self->magic == LAP_MAGIC, return;);
 795
 796         /* Next to send and next to receive */
 797         self->vs = self->vr = 0;
 798
 799         /* Last frame which got acked (0 - 1) % 8 */
 800         self->va = 7;
 801
 802         self->window = 1;
 803
 804         self->remote_busy = FALSE;
 805         self->retry_count = 0;
 806 }
 807
 808 /*
 809  * Function irlap_wait_min_turn_around (self, qos)
 810  *
 811  *    Wait negotiated minimum turn around time, this function actually sets
 812  *    the number of BOS's that must be sent before the next transmitted
 813  *    frame in order to delay for the specified amount of time. This is
 814  *    done to avoid using timers, and the forbidden udelay!
 815  */
 816 void irlap_wait_min_turn_around(struct irlap_cb *self, struct qos_info *qos)
 817 {
 818         __u32 min_turn_time;
 819         __u32 speed;
 820
 821         /* Get QoS values.  */
 822         speed = qos->baud_rate.value;
 823         min_turn_time = qos->min_turn_time.value;
 824
 825         /* No need to calculate XBOFs for speeds over 115200 bps */
 826         if (speed > 115200) {
 827                 self->mtt_required = min_turn_time;
 828                 return;
 829         }
 830
 831         /*
 832          *  Send additional BOF's for the next frame for the requested
 833          *  min turn time, so now we must calculate how many chars (XBOF's) we
 834          *  must send for the requested time period (min turn time)
 835          */
 836         self->xbofs_delay = irlap_min_turn_time_in_bytes(speed, min_turn_time);
 837 }
 838
 839 /*
 840  * Function irlap_flush_all_queues (void)
 841  *
 842  *    Flush all queues
 843  *
 844  */
 845 void irlap_flush_all_queues(struct irlap_cb *self)
 846 {
 847         struct sk_buff* skb;
 848
 849         IRDA_ASSERT(self != NULL, return;);
 850         IRDA_ASSERT(self->magic == LAP_MAGIC, return;);
 851
 852         /* Free transmission queue */
 853         while ((skb = skb_dequeue(&self->txq)) != NULL)
 854                 dev_kfree_skb(skb);
 855
 856         while ((skb = skb_dequeue(&self->txq_ultra)) != NULL)
 857                 dev_kfree_skb(skb);
 858
 859         /* Free sliding window buffered packets */
 860         while ((skb = skb_dequeue(&self->wx_list)) != NULL)
 861                 dev_kfree_skb(skb);
 862 }
 863
 864 /*
 865  * Function irlap_setspeed (self, speed)
 866  *
 867  *    Change the speed of the IrDA port
 868  *
 869  */
 870 static void irlap_change_speed(struct irlap_cb *self, __u32 speed, int now)
 871 {
 872         struct sk_buff *skb;
 873
 874         IRDA_DEBUG(0, "%s(), setting speed to %d\n", __func__, speed);
 875
 876         IRDA_ASSERT(self != NULL, return;);
 877         IRDA_ASSERT(self->magic == LAP_MAGIC, return;);
 878
 879         self->speed = speed;
 880
 881         /* Change speed now, or just piggyback speed on frames */
 882         if (now) {
 883                 /* Send down empty frame to trigger speed change */
 884                 skb = alloc_skb(0, GFP_ATOMIC);
 885                 if (skb)
 886                         irlap_queue_xmit(self, skb);
 887         }
 888 }
 889
 890 /*
 891  * Function irlap_init_qos_capabilities (self, qos)
 892  *
 893  *    Initialize QoS for this IrLAP session, What we do is to compute the
 894  *    intersection of the QoS capabilities for the user, driver and for
 895  *    IrLAP itself. Normally, IrLAP will not specify any values, but it can
 896  *    be used to restrict certain values.
 897  */
 898 static void irlap_init_qos_capabilities(struct irlap_cb *self,
 899                                         struct qos_info *qos_user)
 900 {
 901         IRDA_ASSERT(self != NULL, return;);
 902         IRDA_ASSERT(self->magic == LAP_MAGIC, return;);
 903         IRDA_ASSERT(self->netdev != NULL, return;);
 904
 905         /* Start out with the maximum QoS support possible */
 906         irda_init_max_qos_capabilies(&self->qos_rx);
 907
 908         /* Apply drivers QoS capabilities */
 909         irda_qos_compute_intersection(&self->qos_rx, self->qos_dev);
 910
 911         /*
 912          *  Check for user supplied QoS parameters. The service user is only
 913          *  allowed to supply these values. We check each parameter since the
 914          *  user may not have set all of them.
 915          */
 916         if (qos_user) {
 917                 IRDA_DEBUG(1, "%s(), Found user specified QoS!\n", __func__);
 918
 919                 if (qos_user->baud_rate.bits)
 920                         self->qos_rx.baud_rate.bits &= qos_user->baud_rate.bits;
 921
 922                 if (qos_user->max_turn_time.bits)
 923                         self->qos_rx.max_turn_time.bits &= qos_user->max_turn_time.bits;
 924                 if (qos_user->data_size.bits)
 925                         self->qos_rx.data_size.bits &= qos_user->data_size.bits;
 926
 927                 if (qos_user->link_disc_time.bits)
 928                         self->qos_rx.link_disc_time.bits &= qos_user->link_disc_time.bits;
 929         }
 930
 931         /* Use 500ms in IrLAP for now */
 932         self->qos_rx.max_turn_time.bits &= 0x01;
 933
 934         /* Set data size */
 935         /*self->qos_rx.data_size.bits &= 0x03;*/
 936
 937         irda_qos_bits_to_value(&self->qos_rx);
 938 }
 939
 940 /*
 941  * Function irlap_apply_default_connection_parameters (void, now)
 942  *
 943  *    Use the default connection and transmission parameters
 944  */
 945 void irlap_apply_default_connection_parameters(struct irlap_cb *self)
 946 {
 947         IRDA_DEBUG(4, "%s()\n", __func__);
 948
 949         IRDA_ASSERT(self != NULL, return;);
 950         IRDA_ASSERT(self->magic == LAP_MAGIC, return;);
 951
 952         /* xbofs : Default value in NDM */
 953         self->next_bofs   = 12;
 954         self->bofs_count  = 12;
 955
 956         /* NDM Speed is 9600 */
 957         irlap_change_speed(self, 9600, TRUE);
 958
 959         /* Set mbusy when going to NDM state */
 960         irda_device_set_media_busy(self->netdev, TRUE);
 961
 962         /*
 963          * Generate random connection address for this session, which must
 964          * be 7 bits wide and different from 0x00 and 0xfe
 965          */
 966         while ((self->caddr == 0x00) || (self->caddr == 0xfe)) {
 967                 get_random_bytes(&self->caddr, sizeof(self->caddr));
 968                 self->caddr &= 0xfe;
 969         }
 970
 971         /* Use default values until connection has been negitiated */
 972         self->slot_timeout = sysctl_slot_timeout;
 973         self->final_timeout = FINAL_TIMEOUT;
 974         self->poll_timeout = POLL_TIMEOUT;
 975         self->wd_timeout = WD_TIMEOUT;
 976
 977         /* Set some default values */
 978         self->qos_tx.baud_rate.value = 9600;
 979         self->qos_rx.baud_rate.value = 9600;
 980         self->qos_tx.max_turn_time.value = 0;
 981         self->qos_rx.max_turn_time.value = 0;
 982         self->qos_tx.min_turn_time.value = 0;
 983         self->qos_rx.min_turn_time.value = 0;
 984         self->qos_tx.data_size.value = 64;
 985         self->qos_rx.data_size.value = 64;
 986         self->qos_tx.window_size.value = 1;
 987         self->qos_rx.window_size.value = 1;
 988         self->qos_tx.additional_bofs.value = 12;
 989         self->qos_rx.additional_bofs.value = 12;
 990         self->qos_tx.link_disc_time.value = 0;
 991         self->qos_rx.link_disc_time.value = 0;
 992
 993         irlap_flush_all_queues(self);
 994
 995         self->disconnect_pending = FALSE;
 996         self->connect_pending = FALSE;
 997 }
 998
 999 /*
1000  * Function irlap_apply_connection_parameters (qos, now)
1001  *
1002  *    Initialize IrLAP with the negotiated QoS values
1003  *
1004  * If 'now' is false, the speed and xbofs will be changed after the next
1005  * frame is sent.
1006  * If 'now' is true, the speed and xbofs is changed immediately
1007  */
1008 void irlap_apply_connection_parameters(struct irlap_cb *self, int now)
1009 {
1010         IRDA_DEBUG(4, "%s()\n", __func__);
1011
1012         IRDA_ASSERT(self != NULL, return;);
1013         IRDA_ASSERT(self->magic == LAP_MAGIC, return;);
1014
1015         /* Set the negotiated xbofs value */
1016         self->next_bofs   = self->qos_tx.additional_bofs.value;
1017         if (now)
1018                 self->bofs_count = self->next_bofs;
1019
1020         /* Set the negotiated link speed (may need the new xbofs value) */
1021         irlap_change_speed(self, self->qos_tx.baud_rate.value, now);
1022
1023         self->window_size = self->qos_tx.window_size.value;
1024         self->window      = self->qos_tx.window_size.value;
1025
1026 #ifdef CONFIG_IRDA_DYNAMIC_WINDOW
1027         /*
1028          *  Calculate how many bytes it is possible to transmit before the
1029          *  link must be turned around
1030          */
1031         self->line_capacity =
1032                 irlap_max_line_capacity(self->qos_tx.baud_rate.value,
1033                                         self->qos_tx.max_turn_time.value);
1034         self->bytes_left = self->line_capacity;
1035 #endif /* CONFIG_IRDA_DYNAMIC_WINDOW */
1036
1037
1038         /*
1039          *  Initialize timeout values, some of the rules are listed on
1040          *  page 92 in IrLAP.
1041          */
1042         IRDA_ASSERT(self->qos_tx.max_turn_time.value != 0, return;);
1043         IRDA_ASSERT(self->qos_rx.max_turn_time.value != 0, return;);
1044         /* The poll timeout applies only to the primary station.
1045          * It defines the maximum time the primary stay in XMIT mode
1046          * before timeout and turning the link around (sending a RR).
1047          * Or, this is how much we can keep the pf bit in primary mode.
1048          * Therefore, it must be lower or equal than our *OWN* max turn around.
1049          * Jean II */
1050         self->poll_timeout = self->qos_tx.max_turn_time.value * HZ / 1000;
1051         /* The Final timeout applies only to the primary station.
1052          * It defines the maximum time the primary wait (mostly in RECV mode)
1053          * for an answer from the secondary station before polling it again.
1054          * Therefore, it must be greater or equal than our *PARTNER*
1055          * max turn around time - Jean II */
1056         self->final_timeout = self->qos_rx.max_turn_time.value * HZ / 1000;
1057         /* The Watchdog Bit timeout applies only to the secondary station.
1058          * It defines the maximum time the secondary wait (mostly in RECV mode)
1059          * for poll from the primary station before getting annoyed.
1060          * Therefore, it must be greater or equal than our *PARTNER*
1061          * max turn around time - Jean II */
1062         self->wd_timeout = self->final_timeout * 2;
1063
1064         /*
1065          * N1 and N2 are maximum retry count for *both* the final timer
1066          * and the wd timer (with a factor 2) as defined above.
1067          * After N1 retry of a timer, we give a warning to the user.
1068          * After N2 retry, we consider the link dead and disconnect it.
1069          * Jean II
1070          */
1071
1072         /*
1073          *  Set N1 to 0 if Link Disconnect/Threshold Time = 3 and set it to
1074          *  3 seconds otherwise. See page 71 in IrLAP for more details.
1075          *  Actually, it's not always 3 seconds, as we allow to set
1076          *  it via sysctl... Max maxtt is 500ms, and N1 need to be multiple
1077          *  of 2, so 1 second is minimum we can allow. - Jean II
1078          */
1079         if (self->qos_tx.link_disc_time.value == sysctl_warn_noreply_time)
1080                 /*
1081                  * If we set N1 to 0, it will trigger immediately, which is
1082                  * not what we want. What we really want is to disable it,
1083                  * Jean II
1084                  */
1085                 self->N1 = -2; /* Disable - Need to be multiple of 2*/
1086         else
1087                 self->N1 = sysctl_warn_noreply_time * 1000 /
1088                   self->qos_rx.max_turn_time.value;
1089
1090         IRDA_DEBUG(4, "Setting N1 = %d\n", self->N1);
1091
1092         /* Set N2 to match our own disconnect time */
1093         self->N2 = self->qos_tx.link_disc_time.value * 1000 /
1094                 self->qos_rx.max_turn_time.value;
1095         IRDA_DEBUG(4, "Setting N2 = %d\n", self->N2);
1096 }
1097
1098 #ifdef CONFIG_PROC_FS
1099 struct irlap_iter_state {
1100         int id;
1101 };
1102
1103 static void *irlap_seq_start(struct seq_file *seq, loff_t *pos)
1104 {
1105         struct irlap_iter_state *iter = seq->private;
1106         struct irlap_cb *self;
1107
1108         /* Protect our access to the tsap list */
1109         spin_lock_irq(&irlap->hb_spinlock);
1110         iter->id = 0;
1111
1112         for (self = (struct irlap_cb *) hashbin_get_first(irlap);
1113              self; self = (struct irlap_cb *) hashbin_get_next(irlap)) {
1114                 if (iter->id == *pos)
1115                         break;
1116                 ++iter->id;
1117         }
1118
1119         return self;
1120 }
1121
1122 static void *irlap_seq_next(struct seq_file *seq, void *v, loff_t *pos)
1123 {
1124         struct irlap_iter_state *iter = seq->private;
1125
1126         ++*pos;
1127         ++iter->id;
1128         return (void *) hashbin_get_next(irlap);
1129 }
1130
1131 static void irlap_seq_stop(struct seq_file *seq, void *v)
1132 {
1133         spin_unlock_irq(&irlap->hb_spinlock);
1134 }
1135
1136 static int irlap_seq_show(struct seq_file *seq, void *v)
1137 {
1138         const struct irlap_iter_state *iter = seq->private;
1139         const struct irlap_cb *self = v;
1140
1141         IRDA_ASSERT(self->magic == LAP_MAGIC, return -EINVAL;);
1142
1143         seq_printf(seq, "irlap%d ", iter->id);
1144         seq_printf(seq, "state: %s\n",
1145                    irlap_state[self->state]);
1146
1147         seq_printf(seq, "  device name: %s, ",
1148                    (self->netdev) ? self->netdev->name : "bug");
1149         seq_printf(seq, "hardware name: %s\n", self->hw_name);
1150
1151         seq_printf(seq, "  caddr: %#02x, ", self->caddr);
1152         seq_printf(seq, "saddr: %#08x, ", self->saddr);
1153         seq_printf(seq, "daddr: %#08x\n", self->daddr);
1154
1155         seq_printf(seq, "  win size: %d, ",
1156                    self->window_size);
1157         seq_printf(seq, "win: %d, ", self->window);
1158 #ifdef CONFIG_IRDA_DYNAMIC_WINDOW
1159         seq_printf(seq, "line capacity: %d, ",
1160                    self->line_capacity);
1161         seq_printf(seq, "bytes left: %d\n", self->bytes_left);
1162 #endif /* CONFIG_IRDA_DYNAMIC_WINDOW */
1163         seq_printf(seq, "  tx queue len: %d ",
1164                    skb_queue_len(&self->txq));
1165         seq_printf(seq, "win queue len: %d ",
1166                    skb_queue_len(&self->wx_list));
1167         seq_printf(seq, "rbusy: %s", self->remote_busy ?
1168                    "TRUE" : "FALSE");
1169         seq_printf(seq, " mbusy: %s\n", self->media_busy ?
1170                    "TRUE" : "FALSE");
1171
1172         seq_printf(seq, "  retrans: %d ", self->retry_count);
1173         seq_printf(seq, "vs: %d ", self->vs);
1174         seq_printf(seq, "vr: %d ", self->vr);
1175         seq_printf(seq, "va: %d\n", self->va);
1176
1177         seq_printf(seq, "  qos\tbps\tmaxtt\tdsize\twinsize\taddbofs\tmintt\tldisc\tcomp\n");
1178
1179         seq_printf(seq, "  tx\t%d\t",
1180                    self->qos_tx.baud_rate.value);
1181         seq_printf(seq, "%d\t",
1182                    self->qos_tx.max_turn_time.value);
1183         seq_printf(seq, "%d\t",
1184                    self->qos_tx.data_size.value);
1185         seq_printf(seq, "%d\t",
1186                    self->qos_tx.window_size.value);
1187         seq_printf(seq, "%d\t",
1188                    self->qos_tx.additional_bofs.value);
1189         seq_printf(seq, "%d\t",
1190                    self->qos_tx.min_turn_time.value);
1191         seq_printf(seq, "%d\t",
1192                    self->qos_tx.link_disc_time.value);
1193         seq_printf(seq, "\n");
1194
1195         seq_printf(seq, "  rx\t%d\t",
1196                    self->qos_rx.baud_rate.value);
1197         seq_printf(seq, "%d\t",
1198                    self->qos_rx.max_turn_time.value);
1199         seq_printf(seq, "%d\t",
1200                    self->qos_rx.data_size.value);
1201         seq_printf(seq, "%d\t",
1202                    self->qos_rx.window_size.value);
1203         seq_printf(seq, "%d\t",
1204                    self->qos_rx.additional_bofs.value);
1205         seq_printf(seq, "%d\t",
1206                    self->qos_rx.min_turn_time.value);
1207         seq_printf(seq, "%d\n",
1208                    self->qos_rx.link_disc_time.value);
1209
1210         return 0;
1211 }
1212
1213 static const struct seq_operations irlap_seq_ops = {
1214         .start  = irlap_seq_start,
1215         .next   = irlap_seq_next,
1216         .stop   = irlap_seq_stop,
1217         .show   = irlap_seq_show,
1218 };
1219
1220 static int irlap_seq_open(struct inode *inode, struct file *file)
1221 {
1222         if (irlap == NULL)
1223                 return -EINVAL;
1224
1225         return seq_open_private(file, &irlap_seq_ops,
1226                         sizeof(struct irlap_iter_state));
1227 }
1228
1229 const struct file_operations irlap_seq_fops = {
1230         .owner          = THIS_MODULE,
1231         .open           = irlap_seq_open,
1232         .read           = seq_read,
1233         .llseek         = seq_lseek,
1234         .release        = seq_release_private,
1235 };
1236
1237 #endif /* CONFIG_PROC_FS */