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   1 /*********************************************************************
   2  *
   3  * Filename:      irlan_common.c
   4  * Version:       0.9
   5  * Description:   IrDA LAN Access Protocol Implementation
   6  * Status:        Experimental.
   7  * Author:        Dag Brattli <dagb@cs.uit.no>
   8  * Created at:    Sun Aug 31 20:14:37 1997
   9  * Modified at:   Sun Dec 26 21:53:10 1999
  10  * Modified by:   Dag Brattli <dagb@cs.uit.no>
  11  *
  12  *     Copyright (c) 1997, 1999 Dag Brattli <dagb@cs.uit.no>,
  13  *     All Rights Reserved.
  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  *     Neither Dag Brattli nor University of Tromsø admit liability nor
  21  *     provide warranty for any of this software. This material is
  22  *     provided "AS-IS" and at no charge.
  23  *
  24  ********************************************************************/
  25
  26 #include <linux/module.h>
  27
  28 #include <linux/kernel.h>
  29 #include <linux/string.h>
  30 #include <linux/init.h>
  31 #include <linux/errno.h>
  32 #include <linux/proc_fs.h>
  33 #include <linux/sched.h>
  34 #include <linux/seq_file.h>
  35 #include <linux/random.h>
  36 #include <linux/netdevice.h>
  37 #include <linux/etherdevice.h>
  38 #include <linux/rtnetlink.h>
  39 #include <linux/moduleparam.h>
  40 #include <linux/bitops.h>
  41
  42 #include <asm/system.h>
  43 #include <asm/byteorder.h>
  44
  45 #include <net/irda/irda.h>
  46 #include <net/irda/irttp.h>
  47 #include <net/irda/irlmp.h>
  48 #include <net/irda/iriap.h>
  49 #include <net/irda/timer.h>
  50
  51 #include <net/irda/irlan_common.h>
  52 #include <net/irda/irlan_client.h>
  53 #include <net/irda/irlan_provider.h>
  54 #include <net/irda/irlan_eth.h>
  55 #include <net/irda/irlan_filter.h>
  56
  57
  58 /* extern char sysctl_devname[]; */
  59
  60 /*
  61  *  Master structure
  62  */
  63 static LIST_HEAD(irlans);
  64
  65 static void *ckey;
  66 static void *skey;
  67
  68 /* Module parameters */
  69 static int eth;   /* Use "eth" or "irlan" name for devices */
  70 static int access = ACCESS_PEER; /* PEER, DIRECT or HOSTED */
  71
  72 #ifdef CONFIG_PROC_FS
  73 static const char *const irlan_access[] = {
  74         "UNKNOWN",
  75         "DIRECT",
  76         "PEER",
  77         "HOSTED"
  78 };
  79
  80 static const char *const irlan_media[] = {
  81         "UNKNOWN",
  82         "802.3",
  83         "802.5"
  84 };
  85
  86 extern struct proc_dir_entry *proc_irda;
  87
  88 static int irlan_seq_open(struct inode *inode, struct file *file);
  89
  90 static const struct file_operations irlan_fops = {
  91         .owner   = THIS_MODULE,
  92         .open    = irlan_seq_open,
  93         .read    = seq_read,
  94         .llseek  = seq_lseek,
  95         .release = seq_release,
  96 };
  97
  98 extern struct proc_dir_entry *proc_irda;
  99 #endif /* CONFIG_PROC_FS */
 100
 101 static struct irlan_cb *irlan_open(__u32 saddr, __u32 daddr);
 102 static void __irlan_close(struct irlan_cb *self);
 103 static int __irlan_insert_param(struct sk_buff *skb, char *param, int type,
 104                                 __u8 value_byte, __u16 value_short,
 105                                 __u8 *value_array, __u16 value_len);
 106 static void irlan_open_unicast_addr(struct irlan_cb *self);
 107 static void irlan_get_unicast_addr(struct irlan_cb *self);
 108 void irlan_close_tsaps(struct irlan_cb *self);
 109
 110 /*
 111  * Function irlan_init (void)
 112  *
 113  *    Initialize IrLAN layer
 114  *
 115  */
 116 static int __init irlan_init(void)
 117 {
 118         struct irlan_cb *new;
 119         __u16 hints;
 120
 121         IRDA_DEBUG(2, "%s()\n", __func__ );
 122
 123 #ifdef CONFIG_PROC_FS
 124         { struct proc_dir_entry *proc;
 125         proc = proc_create("irlan", 0, proc_irda, &irlan_fops);
 126         if (!proc) {
 127                 printk(KERN_ERR "irlan_init: can't create /proc entry!\n");
 128                 return -ENODEV;
 129         }
 130         }
 131 #endif /* CONFIG_PROC_FS */
 132
 133         IRDA_DEBUG(4, "%s()\n", __func__ );
 134         hints = irlmp_service_to_hint(S_LAN);
 135
 136         /* Register with IrLMP as a client */
 137         ckey = irlmp_register_client(hints, &irlan_client_discovery_indication,
 138                                      NULL, NULL);
 139         if (!ckey)
 140                 goto err_ckey;
 141
 142         /* Register with IrLMP as a service */
 143         skey = irlmp_register_service(hints);
 144         if (!skey)
 145                 goto err_skey;
 146
 147         /* Start the master IrLAN instance (the only one for now) */
 148         new = irlan_open(DEV_ADDR_ANY, DEV_ADDR_ANY);
 149         if (!new)
 150                 goto err_open;
 151
 152         /* The master will only open its (listen) control TSAP */
 153         irlan_provider_open_ctrl_tsap(new);
 154
 155         /* Do some fast discovery! */
 156         irlmp_discovery_request(DISCOVERY_DEFAULT_SLOTS);
 157
 158         return 0;
 159
 160 err_open:
 161         irlmp_unregister_service(skey);
 162 err_skey:
 163         irlmp_unregister_client(ckey);
 164 err_ckey:
 165 #ifdef CONFIG_PROC_FS
 166         remove_proc_entry("irlan", proc_irda);
 167 #endif /* CONFIG_PROC_FS */
 168
 169         return -ENOMEM;
 170 }
 171
 172 static void __exit irlan_cleanup(void)
 173 {
 174         struct irlan_cb *self, *next;
 175
 176         IRDA_DEBUG(4, "%s()\n", __func__ );
 177
 178         irlmp_unregister_client(ckey);
 179         irlmp_unregister_service(skey);
 180
 181 #ifdef CONFIG_PROC_FS
 182         remove_proc_entry("irlan", proc_irda);
 183 #endif /* CONFIG_PROC_FS */
 184
 185         /* Cleanup any leftover network devices */
 186         rtnl_lock();
 187         list_for_each_entry_safe(self, next, &irlans, dev_list) {
 188                 __irlan_close(self);
 189         }
 190         rtnl_unlock();
 191 }
 192
 193 /*
 194  * Function irlan_open (void)
 195  *
 196  *    Open new instance of a client/provider, we should only register the
 197  *    network device if this instance is ment for a particular client/provider
 198  */
 199 static struct irlan_cb *irlan_open(__u32 saddr, __u32 daddr)
 200 {
 201         struct net_device *dev;
 202         struct irlan_cb *self;
 203
 204         IRDA_DEBUG(2, "%s()\n", __func__ );
 205
 206         /* Create network device with irlan */
 207         dev = alloc_irlandev(eth ? "eth%d" : "irlan%d");
 208         if (!dev)
 209                 return NULL;
 210
 211         self = netdev_priv(dev);
 212         self->dev = dev;
 213
 214         /*
 215          *  Initialize local device structure
 216          */
 217         self->magic = IRLAN_MAGIC;
 218         self->saddr = saddr;
 219         self->daddr = daddr;
 220
 221         /* Provider access can only be PEER, DIRECT, or HOSTED */
 222         self->provider.access_type = access;
 223         if (access == ACCESS_DIRECT) {
 224                 /*
 225                  * Since we are emulating an IrLAN sever we will have to
 226                  * give ourself an ethernet address!
 227                  */
 228                 dev->dev_addr[0] = 0x40;
 229                 dev->dev_addr[1] = 0x00;
 230                 dev->dev_addr[2] = 0x00;
 231                 dev->dev_addr[3] = 0x00;
 232                 get_random_bytes(dev->dev_addr+4, 1);
 233                 get_random_bytes(dev->dev_addr+5, 1);
 234         }
 235
 236         self->media = MEDIA_802_3;
 237         self->disconnect_reason = LM_USER_REQUEST;
 238         init_timer(&self->watchdog_timer);
 239         init_timer(&self->client.kick_timer);
 240         init_waitqueue_head(&self->open_wait);
 241
 242         skb_queue_head_init(&self->client.txq);
 243
 244         irlan_next_client_state(self, IRLAN_IDLE);
 245         irlan_next_provider_state(self, IRLAN_IDLE);
 246
 247         if (register_netdev(dev)) {
 248                 IRDA_DEBUG(2, "%s(), register_netdev() failed!\n",
 249                            __func__ );
 250                 self = NULL;
 251                 free_netdev(dev);
 252         } else {
 253                 rtnl_lock();
 254                 list_add_rcu(&self->dev_list, &irlans);
 255                 rtnl_unlock();
 256         }
 257
 258         return self;
 259 }
 260 /*
 261  * Function __irlan_close (self)
 262  *
 263  *    This function closes and deallocates the IrLAN client instances. Be
 264  *    aware that other functions which calls client_close() must
 265  *    remove self from irlans list first.
 266  */
 267 static void __irlan_close(struct irlan_cb *self)
 268 {
 269         IRDA_DEBUG(2, "%s()\n", __func__ );
 270
 271         ASSERT_RTNL();
 272         IRDA_ASSERT(self != NULL, return;);
 273         IRDA_ASSERT(self->magic == IRLAN_MAGIC, return;);
 274
 275         del_timer_sync(&self->watchdog_timer);
 276         del_timer_sync(&self->client.kick_timer);
 277
 278         /* Close all open connections and remove TSAPs */
 279         irlan_close_tsaps(self);
 280
 281         if (self->client.iriap)
 282                 iriap_close(self->client.iriap);
 283
 284         /* Remove frames queued on the control channel */
 285         skb_queue_purge(&self->client.txq);
 286
 287         /* Unregister and free self via destructor */
 288         unregister_netdevice(self->dev);
 289 }
 290
 291 /* Find any instance of irlan, used for client discovery wakeup */
 292 struct irlan_cb *irlan_get_any(void)
 293 {
 294         struct irlan_cb *self;
 295
 296         list_for_each_entry_rcu(self, &irlans, dev_list) {
 297                 return self;
 298         }
 299         return NULL;
 300 }
 301
 302 /*
 303  * Function irlan_connect_indication (instance, sap, qos, max_sdu_size, skb)
 304  *
 305  *    Here we receive the connect indication for the data channel
 306  *
 307  */
 308 static void irlan_connect_indication(void *instance, void *sap,
 309                                      struct qos_info *qos,
 310                                      __u32 max_sdu_size,
 311                                      __u8 max_header_size,
 312                                      struct sk_buff *skb)
 313 {
 314         struct irlan_cb *self;
 315         struct tsap_cb *tsap;
 316
 317         IRDA_DEBUG(2, "%s()\n", __func__ );
 318
 319         self = (struct irlan_cb *) instance;
 320         tsap = (struct tsap_cb *) sap;
 321
 322         IRDA_ASSERT(self != NULL, return;);
 323         IRDA_ASSERT(self->magic == IRLAN_MAGIC, return;);
 324         IRDA_ASSERT(tsap == self->tsap_data,return;);
 325
 326         self->max_sdu_size = max_sdu_size;
 327         self->max_header_size = max_header_size;
 328
 329         IRDA_DEBUG(0, "%s: We are now connected!\n", __func__);
 330
 331         del_timer(&self->watchdog_timer);
 332
 333         /* If you want to pass the skb to *both* state machines, you will
 334          * need to skb_clone() it, so that you don't free it twice.
 335          * As the state machines don't need it, git rid of it here...
 336          * Jean II */
 337         if (skb)
 338                 dev_kfree_skb(skb);
 339
 340         irlan_do_provider_event(self, IRLAN_DATA_CONNECT_INDICATION, NULL);
 341         irlan_do_client_event(self, IRLAN_DATA_CONNECT_INDICATION, NULL);
 342
 343         if (self->provider.access_type == ACCESS_PEER) {
 344                 /*
 345                  * Data channel is open, so we are now allowed to
 346                  * configure the remote filter
 347                  */
 348                 irlan_get_unicast_addr(self);
 349                 irlan_open_unicast_addr(self);
 350         }
 351         /* Ready to transfer Ethernet frames (at last) */
 352         netif_start_queue(self->dev); /* Clear reason */
 353 }
 354
 355 static void irlan_connect_confirm(void *instance, void *sap,
 356                                   struct qos_info *qos,
 357                                   __u32 max_sdu_size,
 358                                   __u8 max_header_size,
 359                                   struct sk_buff *skb)
 360 {
 361         struct irlan_cb *self;
 362
 363         self = (struct irlan_cb *) instance;
 364
 365         IRDA_ASSERT(self != NULL, return;);
 366         IRDA_ASSERT(self->magic == IRLAN_MAGIC, return;);
 367
 368         self->max_sdu_size = max_sdu_size;
 369         self->max_header_size = max_header_size;
 370
 371         /* TODO: we could set the MTU depending on the max_sdu_size */
 372
 373         IRDA_DEBUG(0, "%s: We are now connected!\n", __func__);
 374         del_timer(&self->watchdog_timer);
 375
 376         /*
 377          * Data channel is open, so we are now allowed to configure the remote
 378          * filter
 379          */
 380         irlan_get_unicast_addr(self);
 381         irlan_open_unicast_addr(self);
 382
 383         /* Open broadcast and multicast filter by default */
 384         irlan_set_broadcast_filter(self, TRUE);
 385         irlan_set_multicast_filter(self, TRUE);
 386
 387         /* Ready to transfer Ethernet frames */
 388         netif_start_queue(self->dev);
 389         self->disconnect_reason = 0; /* Clear reason */
 390         wake_up_interruptible(&self->open_wait);
 391 }
 392
 393 /*
 394  * Function irlan_client_disconnect_indication (handle)
 395  *
 396  *    Callback function for the IrTTP layer. Indicates a disconnection of
 397  *    the specified connection (handle)
 398  */
 399 static void irlan_disconnect_indication(void *instance,
 400                                         void *sap, LM_REASON reason,
 401                                         struct sk_buff *userdata)
 402 {
 403         struct irlan_cb *self;
 404         struct tsap_cb *tsap;
 405
 406         IRDA_DEBUG(0, "%s(), reason=%d\n", __func__ , reason);
 407
 408         self = (struct irlan_cb *) instance;
 409         tsap = (struct tsap_cb *) sap;
 410
 411         IRDA_ASSERT(self != NULL, return;);
 412         IRDA_ASSERT(self->magic == IRLAN_MAGIC, return;);
 413         IRDA_ASSERT(tsap != NULL, return;);
 414         IRDA_ASSERT(tsap->magic == TTP_TSAP_MAGIC, return;);
 415
 416         IRDA_ASSERT(tsap == self->tsap_data, return;);
 417
 418         IRDA_DEBUG(2, "IrLAN, data channel disconnected by peer!\n");
 419
 420         /* Save reason so we know if we should try to reconnect or not */
 421         self->disconnect_reason = reason;
 422
 423         switch (reason) {
 424         case LM_USER_REQUEST: /* User request */
 425                 IRDA_DEBUG(2, "%s(), User requested\n", __func__ );
 426                 break;
 427         case LM_LAP_DISCONNECT: /* Unexpected IrLAP disconnect */
 428                 IRDA_DEBUG(2, "%s(), Unexpected IrLAP disconnect\n", __func__ );
 429                 break;
 430         case LM_CONNECT_FAILURE: /* Failed to establish IrLAP connection */
 431                 IRDA_DEBUG(2, "%s(), IrLAP connect failed\n", __func__ );
 432                 break;
 433         case LM_LAP_RESET:  /* IrLAP reset */
 434                 IRDA_DEBUG(2, "%s(), IrLAP reset\n", __func__ );
 435                 break;
 436         case LM_INIT_DISCONNECT:
 437                 IRDA_DEBUG(2, "%s(), IrLMP connect failed\n", __func__ );
 438                 break;
 439         default:
 440                 IRDA_ERROR("%s(), Unknown disconnect reason\n", __func__);
 441                 break;
 442         }
 443
 444         /* If you want to pass the skb to *both* state machines, you will
 445          * need to skb_clone() it, so that you don't free it twice.
 446          * As the state machines don't need it, git rid of it here...
 447          * Jean II */
 448         if (userdata)
 449                 dev_kfree_skb(userdata);
 450
 451         irlan_do_client_event(self, IRLAN_LMP_DISCONNECT, NULL);
 452         irlan_do_provider_event(self, IRLAN_LMP_DISCONNECT, NULL);
 453
 454         wake_up_interruptible(&self->open_wait);
 455 }
 456
 457 void irlan_open_data_tsap(struct irlan_cb *self)
 458 {
 459         struct tsap_cb *tsap;
 460         notify_t notify;
 461
 462         IRDA_DEBUG(2, "%s()\n", __func__ );
 463
 464         IRDA_ASSERT(self != NULL, return;);
 465         IRDA_ASSERT(self->magic == IRLAN_MAGIC, return;);
 466
 467         /* Check if already open */
 468         if (self->tsap_data)
 469                 return;
 470
 471         irda_notify_init(&notify);
 472
 473         notify.data_indication       = irlan_eth_receive;
 474         notify.udata_indication      = irlan_eth_receive;
 475         notify.connect_indication    = irlan_connect_indication;
 476         notify.connect_confirm       = irlan_connect_confirm;
 477         notify.flow_indication       = irlan_eth_flow_indication;
 478         notify.disconnect_indication = irlan_disconnect_indication;
 479         notify.instance              = self;
 480         strlcpy(notify.name, "IrLAN data", sizeof(notify.name));
 481
 482         tsap = irttp_open_tsap(LSAP_ANY, DEFAULT_INITIAL_CREDIT, &notify);
 483         if (!tsap) {
 484                 IRDA_DEBUG(2, "%s(), Got no tsap!\n", __func__ );
 485                 return;
 486         }
 487         self->tsap_data = tsap;
 488
 489         /*
 490          *  This is the data TSAP selector which we will pass to the client
 491          *  when the client ask for it.
 492          */
 493         self->stsap_sel_data = self->tsap_data->stsap_sel;
 494 }
 495
 496 void irlan_close_tsaps(struct irlan_cb *self)
 497 {
 498         IRDA_DEBUG(4, "%s()\n", __func__ );
 499
 500         IRDA_ASSERT(self != NULL, return;);
 501         IRDA_ASSERT(self->magic == IRLAN_MAGIC, return;);
 502
 503         /* Disconnect and close all open TSAP connections */
 504         if (self->tsap_data) {
 505                 irttp_disconnect_request(self->tsap_data, NULL, P_NORMAL);
 506                 irttp_close_tsap(self->tsap_data);
 507                 self->tsap_data = NULL;
 508         }
 509         if (self->client.tsap_ctrl) {
 510                 irttp_disconnect_request(self->client.tsap_ctrl, NULL,
 511                                          P_NORMAL);
 512                 irttp_close_tsap(self->client.tsap_ctrl);
 513                 self->client.tsap_ctrl = NULL;
 514         }
 515         if (self->provider.tsap_ctrl) {
 516                 irttp_disconnect_request(self->provider.tsap_ctrl, NULL,
 517                                          P_NORMAL);
 518                 irttp_close_tsap(self->provider.tsap_ctrl);
 519                 self->provider.tsap_ctrl = NULL;
 520         }
 521         self->disconnect_reason = LM_USER_REQUEST;
 522 }
 523
 524 /*
 525  * Function irlan_ias_register (self, tsap_sel)
 526  *
 527  *    Register with LM-IAS
 528  *
 529  */
 530 void irlan_ias_register(struct irlan_cb *self, __u8 tsap_sel)
 531 {
 532         struct ias_object *obj;
 533         struct ias_value *new_value;
 534
 535         IRDA_ASSERT(self != NULL, return;);
 536         IRDA_ASSERT(self->magic == IRLAN_MAGIC, return;);
 537
 538         /*
 539          * Check if object has already been registered by a previous provider.
 540          * If that is the case, we just change the value of the attribute
 541          */
 542         if (!irias_find_object("IrLAN")) {
 543                 obj = irias_new_object("IrLAN", IAS_IRLAN_ID);
 544                 irias_add_integer_attrib(obj, "IrDA:TinyTP:LsapSel", tsap_sel,
 545                                          IAS_KERNEL_ATTR);
 546                 irias_insert_object(obj);
 547         } else {
 548                 new_value = irias_new_integer_value(tsap_sel);
 549                 irias_object_change_attribute("IrLAN", "IrDA:TinyTP:LsapSel",
 550                                               new_value);
 551         }
 552
 553         /* Register PnP object only if not registered before */
 554         if (!irias_find_object("PnP")) {
 555                 obj = irias_new_object("PnP", IAS_PNP_ID);
 556 #if 0
 557                 irias_add_string_attrib(obj, "Name", sysctl_devname,
 558                                         IAS_KERNEL_ATTR);
 559 #else
 560                 irias_add_string_attrib(obj, "Name", "Linux", IAS_KERNEL_ATTR);
 561 #endif
 562                 irias_add_string_attrib(obj, "DeviceID", "HWP19F0",
 563                                         IAS_KERNEL_ATTR);
 564                 irias_add_integer_attrib(obj, "CompCnt", 1, IAS_KERNEL_ATTR);
 565                 if (self->provider.access_type == ACCESS_PEER)
 566                         irias_add_string_attrib(obj, "Comp#01", "PNP8389",
 567                                                 IAS_KERNEL_ATTR);
 568                 else
 569                         irias_add_string_attrib(obj, "Comp#01", "PNP8294",
 570                                                 IAS_KERNEL_ATTR);
 571
 572                 irias_add_string_attrib(obj, "Manufacturer",
 573                                         "Linux-IrDA Project", IAS_KERNEL_ATTR);
 574                 irias_insert_object(obj);
 575         }
 576 }
 577
 578 /*
 579  * Function irlan_run_ctrl_tx_queue (self)
 580  *
 581  *    Try to send the next command in the control transmit queue
 582  *
 583  */
 584 int irlan_run_ctrl_tx_queue(struct irlan_cb *self)
 585 {
 586         struct sk_buff *skb;
 587
 588         IRDA_DEBUG(2, "%s()\n", __func__ );
 589
 590         if (irda_lock(&self->client.tx_busy) == FALSE)
 591                 return -EBUSY;
 592
 593         skb = skb_dequeue(&self->client.txq);
 594         if (!skb) {
 595                 self->client.tx_busy = FALSE;
 596                 return 0;
 597         }
 598
 599         /* Check that it's really possible to send commands */
 600         if ((self->client.tsap_ctrl == NULL) ||
 601             (self->client.state == IRLAN_IDLE))
 602         {
 603                 self->client.tx_busy = FALSE;
 604                 dev_kfree_skb(skb);
 605                 return -1;
 606         }
 607         IRDA_DEBUG(2, "%s(), sending ...\n", __func__ );
 608
 609         return irttp_data_request(self->client.tsap_ctrl, skb);
 610 }
 611
 612 /*
 613  * Function irlan_ctrl_data_request (self, skb)
 614  *
 615  *    This function makes sure that commands on the control channel is being
 616  *    sent in a command/response fashion
 617  */
 618 static void irlan_ctrl_data_request(struct irlan_cb *self, struct sk_buff *skb)
 619 {
 620         IRDA_DEBUG(2, "%s()\n", __func__ );
 621
 622         /* Queue command */
 623         skb_queue_tail(&self->client.txq, skb);
 624
 625         /* Try to send command */
 626         irlan_run_ctrl_tx_queue(self);
 627 }
 628
 629 /*
 630  * Function irlan_get_provider_info (self)
 631  *
 632  *    Send Get Provider Information command to peer IrLAN layer
 633  *
 634  */
 635 void irlan_get_provider_info(struct irlan_cb *self)
 636 {
 637         struct sk_buff *skb;
 638         __u8 *frame;
 639
 640         IRDA_DEBUG(4, "%s()\n", __func__ );
 641
 642         IRDA_ASSERT(self != NULL, return;);
 643         IRDA_ASSERT(self->magic == IRLAN_MAGIC, return;);
 644
 645         skb = alloc_skb(IRLAN_MAX_HEADER + IRLAN_CMD_HEADER,
 646                         GFP_ATOMIC);
 647         if (!skb)
 648                 return;
 649
 650         /* Reserve space for TTP, LMP, and LAP header */
 651         skb_reserve(skb, self->client.max_header_size);
 652         skb_put(skb, 2);
 653
 654         frame = skb->data;
 655
 656         frame[0] = CMD_GET_PROVIDER_INFO;
 657         frame[1] = 0x00;                 /* Zero parameters */
 658
 659         irlan_ctrl_data_request(self, skb);
 660 }
 661
 662 /*
 663  * Function irlan_open_data_channel (self)
 664  *
 665  *    Send an Open Data Command to provider
 666  *
 667  */
 668 void irlan_open_data_channel(struct irlan_cb *self)
 669 {
 670         struct sk_buff *skb;
 671         __u8 *frame;
 672
 673         IRDA_DEBUG(4, "%s()\n", __func__ );
 674
 675         IRDA_ASSERT(self != NULL, return;);
 676         IRDA_ASSERT(self->magic == IRLAN_MAGIC, return;);
 677
 678         skb = alloc_skb(IRLAN_MAX_HEADER + IRLAN_CMD_HEADER +
 679                         IRLAN_STRING_PARAMETER_LEN("MEDIA", "802.3") +
 680                         IRLAN_STRING_PARAMETER_LEN("ACCESS_TYPE", "DIRECT"),
 681                         GFP_ATOMIC);
 682         if (!skb)
 683                 return;
 684
 685         skb_reserve(skb, self->client.max_header_size);
 686         skb_put(skb, 2);
 687
 688         frame = skb->data;
 689
 690         /* Build frame */
 691         frame[0] = CMD_OPEN_DATA_CHANNEL;
 692         frame[1] = 0x02; /* Two parameters */
 693
 694         irlan_insert_string_param(skb, "MEDIA", "802.3");
 695         irlan_insert_string_param(skb, "ACCESS_TYPE", "DIRECT");
 696         /* irlan_insert_string_param(skb, "MODE", "UNRELIABLE"); */
 697
 698 /*      self->use_udata = TRUE; */
 699
 700         irlan_ctrl_data_request(self, skb);
 701 }
 702
 703 void irlan_close_data_channel(struct irlan_cb *self)
 704 {
 705         struct sk_buff *skb;
 706         __u8 *frame;
 707
 708         IRDA_DEBUG(4, "%s()\n", __func__ );
 709
 710         IRDA_ASSERT(self != NULL, return;);
 711         IRDA_ASSERT(self->magic == IRLAN_MAGIC, return;);
 712
 713         /* Check if the TSAP is still there */
 714         if (self->client.tsap_ctrl == NULL)
 715                 return;
 716
 717         skb = alloc_skb(IRLAN_MAX_HEADER + IRLAN_CMD_HEADER +
 718                         IRLAN_BYTE_PARAMETER_LEN("DATA_CHAN"),
 719                         GFP_ATOMIC);
 720         if (!skb)
 721                 return;
 722
 723         skb_reserve(skb, self->client.max_header_size);
 724         skb_put(skb, 2);
 725
 726         frame = skb->data;
 727
 728         /* Build frame */
 729         frame[0] = CMD_CLOSE_DATA_CHAN;
 730         frame[1] = 0x01; /* One parameter */
 731
 732         irlan_insert_byte_param(skb, "DATA_CHAN", self->dtsap_sel_data);
 733
 734         irlan_ctrl_data_request(self, skb);
 735 }
 736
 737 /*
 738  * Function irlan_open_unicast_addr (self)
 739  *
 740  *    Make IrLAN provider accept ethernet frames addressed to the unicast
 741  *    address.
 742  *
 743  */
 744 static void irlan_open_unicast_addr(struct irlan_cb *self)
 745 {
 746         struct sk_buff *skb;
 747         __u8 *frame;
 748
 749         IRDA_DEBUG(4, "%s()\n", __func__ );
 750
 751         IRDA_ASSERT(self != NULL, return;);
 752         IRDA_ASSERT(self->magic == IRLAN_MAGIC, return;);
 753
 754         skb = alloc_skb(IRLAN_MAX_HEADER + IRLAN_CMD_HEADER +
 755                         IRLAN_BYTE_PARAMETER_LEN("DATA_CHAN") +
 756                         IRLAN_STRING_PARAMETER_LEN("FILTER_TYPE", "DIRECTED") +
 757                         IRLAN_STRING_PARAMETER_LEN("FILTER_MODE", "FILTER"),
 758                         GFP_ATOMIC);
 759         if (!skb)
 760                 return;
 761
 762         /* Reserve space for TTP, LMP, and LAP header */
 763         skb_reserve(skb, self->max_header_size);
 764         skb_put(skb, 2);
 765
 766         frame = skb->data;
 767
 768         frame[0] = CMD_FILTER_OPERATION;
 769         frame[1] = 0x03;                 /* Three parameters */
 770         irlan_insert_byte_param(skb, "DATA_CHAN" , self->dtsap_sel_data);
 771         irlan_insert_string_param(skb, "FILTER_TYPE", "DIRECTED");
 772         irlan_insert_string_param(skb, "FILTER_MODE", "FILTER");
 773
 774         irlan_ctrl_data_request(self, skb);
 775 }
 776
 777 /*
 778  * Function irlan_set_broadcast_filter (self, status)
 779  *
 780  *    Make IrLAN provider accept ethernet frames addressed to the broadcast
 781  *    address. Be careful with the use of this one, since there may be a lot
 782  *    of broadcast traffic out there. We can still function without this
 783  *    one but then _we_ have to initiate all communication with other
 784  *    hosts, since ARP request for this host will not be answered.
 785  */
 786 void irlan_set_broadcast_filter(struct irlan_cb *self, int status)
 787 {
 788         struct sk_buff *skb;
 789         __u8 *frame;
 790
 791         IRDA_DEBUG(2, "%s()\n", __func__ );
 792
 793         IRDA_ASSERT(self != NULL, return;);
 794         IRDA_ASSERT(self->magic == IRLAN_MAGIC, return;);
 795
 796         skb = alloc_skb(IRLAN_MAX_HEADER + IRLAN_CMD_HEADER +
 797                         IRLAN_BYTE_PARAMETER_LEN("DATA_CHAN") +
 798                         IRLAN_STRING_PARAMETER_LEN("FILTER_TYPE", "BROADCAST") +
 799                         /* We may waste one byte here...*/
 800                         IRLAN_STRING_PARAMETER_LEN("FILTER_MODE", "FILTER"),
 801                         GFP_ATOMIC);
 802         if (!skb)
 803                 return;
 804
 805         /* Reserve space for TTP, LMP, and LAP header */
 806         skb_reserve(skb, self->client.max_header_size);
 807         skb_put(skb, 2);
 808
 809         frame = skb->data;
 810
 811         frame[0] = CMD_FILTER_OPERATION;
 812         frame[1] = 0x03;                 /* Three parameters */
 813         irlan_insert_byte_param(skb, "DATA_CHAN", self->dtsap_sel_data);
 814         irlan_insert_string_param(skb, "FILTER_TYPE", "BROADCAST");
 815         if (status)
 816                 irlan_insert_string_param(skb, "FILTER_MODE", "FILTER");
 817         else
 818                 irlan_insert_string_param(skb, "FILTER_MODE", "NONE");
 819
 820         irlan_ctrl_data_request(self, skb);
 821 }
 822
 823 /*
 824  * Function irlan_set_multicast_filter (self, status)
 825  *
 826  *    Make IrLAN provider accept ethernet frames addressed to the multicast
 827  *    address.
 828  *
 829  */
 830 void irlan_set_multicast_filter(struct irlan_cb *self, int status)
 831 {
 832         struct sk_buff *skb;
 833         __u8 *frame;
 834
 835         IRDA_DEBUG(2, "%s()\n", __func__ );
 836
 837         IRDA_ASSERT(self != NULL, return;);
 838         IRDA_ASSERT(self->magic == IRLAN_MAGIC, return;);
 839
 840         skb = alloc_skb(IRLAN_MAX_HEADER + IRLAN_CMD_HEADER +
 841                         IRLAN_BYTE_PARAMETER_LEN("DATA_CHAN") +
 842                         IRLAN_STRING_PARAMETER_LEN("FILTER_TYPE", "MULTICAST") +
 843                         /* We may waste one byte here...*/
 844                         IRLAN_STRING_PARAMETER_LEN("FILTER_MODE", "NONE"),
 845                         GFP_ATOMIC);
 846         if (!skb)
 847                 return;
 848
 849         /* Reserve space for TTP, LMP, and LAP header */
 850         skb_reserve(skb, self->client.max_header_size);
 851         skb_put(skb, 2);
 852
 853         frame = skb->data;
 854
 855         frame[0] = CMD_FILTER_OPERATION;
 856         frame[1] = 0x03;                 /* Three parameters */
 857         irlan_insert_byte_param(skb, "DATA_CHAN", self->dtsap_sel_data);
 858         irlan_insert_string_param(skb, "FILTER_TYPE", "MULTICAST");
 859         if (status)
 860                 irlan_insert_string_param(skb, "FILTER_MODE", "ALL");
 861         else
 862                 irlan_insert_string_param(skb, "FILTER_MODE", "NONE");
 863
 864         irlan_ctrl_data_request(self, skb);
 865 }
 866
 867 /*
 868  * Function irlan_get_unicast_addr (self)
 869  *
 870  *    Retrieves the unicast address from the IrLAN provider. This address
 871  *    will be inserted into the devices structure, so the ethernet layer
 872  *    can construct its packets.
 873  *
 874  */
 875 static void irlan_get_unicast_addr(struct irlan_cb *self)
 876 {
 877         struct sk_buff *skb;
 878         __u8 *frame;
 879
 880         IRDA_DEBUG(2, "%s()\n", __func__ );
 881
 882         IRDA_ASSERT(self != NULL, return;);
 883         IRDA_ASSERT(self->magic == IRLAN_MAGIC, return;);
 884
 885         skb = alloc_skb(IRLAN_MAX_HEADER + IRLAN_CMD_HEADER +
 886                         IRLAN_BYTE_PARAMETER_LEN("DATA_CHAN") +
 887                         IRLAN_STRING_PARAMETER_LEN("FILTER_TYPE", "DIRECTED") +
 888                         IRLAN_STRING_PARAMETER_LEN("FILTER_OPERATION",
 889                                                    "DYNAMIC"),
 890                         GFP_ATOMIC);
 891         if (!skb)
 892                 return;
 893
 894         /* Reserve space for TTP, LMP, and LAP header */
 895         skb_reserve(skb, self->client.max_header_size);
 896         skb_put(skb, 2);
 897
 898         frame = skb->data;
 899
 900         frame[0] = CMD_FILTER_OPERATION;
 901         frame[1] = 0x03;                 /* Three parameters */
 902         irlan_insert_byte_param(skb, "DATA_CHAN", self->dtsap_sel_data);
 903         irlan_insert_string_param(skb, "FILTER_TYPE", "DIRECTED");
 904         irlan_insert_string_param(skb, "FILTER_OPERATION", "DYNAMIC");
 905
 906         irlan_ctrl_data_request(self, skb);
 907 }
 908
 909 /*
 910  * Function irlan_get_media_char (self)
 911  *
 912  *
 913  *
 914  */
 915 void irlan_get_media_char(struct irlan_cb *self)
 916 {
 917         struct sk_buff *skb;
 918         __u8 *frame;
 919
 920         IRDA_DEBUG(4, "%s()\n", __func__ );
 921
 922         IRDA_ASSERT(self != NULL, return;);
 923         IRDA_ASSERT(self->magic == IRLAN_MAGIC, return;);
 924
 925         skb = alloc_skb(IRLAN_MAX_HEADER + IRLAN_CMD_HEADER +
 926                         IRLAN_STRING_PARAMETER_LEN("MEDIA", "802.3"),
 927                         GFP_ATOMIC);
 928
 929         if (!skb)
 930                 return;
 931
 932         /* Reserve space for TTP, LMP, and LAP header */
 933         skb_reserve(skb, self->client.max_header_size);
 934         skb_put(skb, 2);
 935
 936         frame = skb->data;
 937
 938         /* Build frame */
 939         frame[0] = CMD_GET_MEDIA_CHAR;
 940         frame[1] = 0x01; /* One parameter */
 941
 942         irlan_insert_string_param(skb, "MEDIA", "802.3");
 943         irlan_ctrl_data_request(self, skb);
 944 }
 945
 946 /*
 947  * Function insert_byte_param (skb, param, value)
 948  *
 949  *    Insert byte parameter into frame
 950  *
 951  */
 952 int irlan_insert_byte_param(struct sk_buff *skb, char *param, __u8 value)
 953 {
 954         return __irlan_insert_param(skb, param, IRLAN_BYTE, value, 0, NULL, 0);
 955 }
 956
 957 int irlan_insert_short_param(struct sk_buff *skb, char *param, __u16 value)
 958 {
 959         return __irlan_insert_param(skb, param, IRLAN_SHORT, 0, value, NULL, 0);
 960 }
 961
 962 /*
 963  * Function insert_string (skb, param, value)
 964  *
 965  *    Insert string parameter into frame
 966  *
 967  */
 968 int irlan_insert_string_param(struct sk_buff *skb, char *param, char *string)
 969 {
 970         int string_len = strlen(string);
 971
 972         return __irlan_insert_param(skb, param, IRLAN_ARRAY, 0, 0, string,
 973                                     string_len);
 974 }
 975
 976 /*
 977  * Function insert_array_param(skb, param, value, len_value)
 978  *
 979  *    Insert array parameter into frame
 980  *
 981  */
 982 int irlan_insert_array_param(struct sk_buff *skb, char *name, __u8 *array,
 983                              __u16 array_len)
 984 {
 985         return __irlan_insert_param(skb, name, IRLAN_ARRAY, 0, 0, array,
 986                                     array_len);
 987 }
 988
 989 /*
 990  * Function insert_param (skb, param, value, byte)
 991  *
 992  *    Insert parameter at end of buffer, structure of a parameter is:
 993  *
 994  *    -----------------------------------------------------------------------
 995  *    | Name Length[1] | Param Name[1..255] | Val Length[2] | Value[0..1016]|
 996  *    -----------------------------------------------------------------------
 997  */
 998 static int __irlan_insert_param(struct sk_buff *skb, char *param, int type,
 999                                 __u8 value_byte, __u16 value_short,
1000                                 __u8 *value_array, __u16 value_len)
1001 {
1002         __u8 *frame;
1003         __u8 param_len;
1004         __le16 tmp_le; /* Temporary value in little endian format */
1005         int n=0;
1006
1007         if (skb == NULL) {
1008                 IRDA_DEBUG(2, "%s(), Got NULL skb\n", __func__ );
1009                 return 0;
1010         }
1011
1012         param_len = strlen(param);
1013         switch (type) {
1014         case IRLAN_BYTE:
1015                 value_len = 1;
1016                 break;
1017         case IRLAN_SHORT:
1018                 value_len = 2;
1019                 break;
1020         case IRLAN_ARRAY:
1021                 IRDA_ASSERT(value_array != NULL, return 0;);
1022                 IRDA_ASSERT(value_len > 0, return 0;);
1023                 break;
1024         default:
1025                 IRDA_DEBUG(2, "%s(), Unknown parameter type!\n", __func__ );
1026                 return 0;
1027                 break;
1028         }
1029
1030         /* Insert at end of sk-buffer */
1031         frame = skb_tail_pointer(skb);
1032
1033         /* Make space for data */
1034         if (skb_tailroom(skb) < (param_len+value_len+3)) {
1035                 IRDA_DEBUG(2, "%s(), No more space at end of skb\n", __func__ );
1036                 return 0;
1037         }
1038         skb_put(skb, param_len+value_len+3);
1039
1040         /* Insert parameter length */
1041         frame[n++] = param_len;
1042
1043         /* Insert parameter */
1044         memcpy(frame+n, param, param_len); n += param_len;
1045
1046         /* Insert value length (2 byte little endian format, LSB first) */
1047         tmp_le = cpu_to_le16(value_len);
1048         memcpy(frame+n, &tmp_le, 2); n += 2; /* To avoid alignment problems */
1049
1050         /* Insert value */
1051         switch (type) {
1052         case IRLAN_BYTE:
1053                 frame[n++] = value_byte;
1054                 break;
1055         case IRLAN_SHORT:
1056                 tmp_le = cpu_to_le16(value_short);
1057                 memcpy(frame+n, &tmp_le, 2); n += 2;
1058                 break;
1059         case IRLAN_ARRAY:
1060                 memcpy(frame+n, value_array, value_len); n+=value_len;
1061                 break;
1062         default:
1063                 break;
1064         }
1065         IRDA_ASSERT(n == (param_len+value_len+3), return 0;);
1066
1067         return param_len+value_len+3;
1068 }
1069
1070 /*
1071  * Function irlan_extract_param (buf, name, value, len)
1072  *
1073  *    Extracts a single parameter name/value pair from buffer and updates
1074  *    the buffer pointer to point to the next name/value pair.
1075  */
1076 int irlan_extract_param(__u8 *buf, char *name, char *value, __u16 *len)
1077 {
1078         __u8 name_len;
1079         __u16 val_len;
1080         int n=0;
1081
1082         IRDA_DEBUG(4, "%s()\n", __func__ );
1083
1084         /* get length of parameter name (1 byte) */
1085         name_len = buf[n++];
1086
1087         if (name_len > 254) {
1088                 IRDA_DEBUG(2, "%s(), name_len > 254\n", __func__ );
1089                 return -RSP_INVALID_COMMAND_FORMAT;
1090         }
1091
1092         /* get parameter name */
1093         memcpy(name, buf+n, name_len);
1094         name[name_len] = '\0';
1095         n+=name_len;
1096
1097         /*
1098          *  Get length of parameter value (2 bytes in little endian
1099          *  format)
1100          */
1101         memcpy(&val_len, buf+n, 2); /* To avoid alignment problems */
1102         le16_to_cpus(&val_len); n+=2;
1103
1104         if (val_len > 1016) {
1105                 IRDA_DEBUG(2, "%s(), parameter length to long\n", __func__ );
1106                 return -RSP_INVALID_COMMAND_FORMAT;
1107         }
1108         *len = val_len;
1109
1110         /* get parameter value */
1111         memcpy(value, buf+n, val_len);
1112         value[val_len] = '\0';
1113         n+=val_len;
1114
1115         IRDA_DEBUG(4, "Parameter: %s ", name);
1116         IRDA_DEBUG(4, "Value: %s\n", value);
1117
1118         return n;
1119 }
1120
1121 #ifdef CONFIG_PROC_FS
1122
1123 /*
1124  * Start of reading /proc entries.
1125  * Return entry at pos,
1126  *      or start_token to indicate print header line
1127  *      or NULL if end of file
1128  */
1129 static void *irlan_seq_start(struct seq_file *seq, loff_t *pos)
1130 {
1131         int i = 1;
1132         struct irlan_cb *self;
1133
1134         rcu_read_lock();
1135         if (*pos == 0)
1136                 return SEQ_START_TOKEN;
1137
1138         list_for_each_entry(self, &irlans, dev_list) {
1139                 if (*pos == i)
1140                         return self;
1141                 ++i;
1142         }
1143         return NULL;
1144 }
1145
1146 /* Return entry after v, and increment pos */
1147 static void *irlan_seq_next(struct seq_file *seq, void *v, loff_t *pos)
1148 {
1149         struct list_head *nxt;
1150
1151         ++*pos;
1152         if (v == SEQ_START_TOKEN)
1153                 nxt = irlans.next;
1154         else
1155                 nxt = ((struct irlan_cb *)v)->dev_list.next;
1156
1157         return (nxt == &irlans) ? NULL
1158                 : list_entry(nxt, struct irlan_cb, dev_list);
1159 }
1160
1161 /* End of reading /proc file */
1162 static void irlan_seq_stop(struct seq_file *seq, void *v)
1163 {
1164         rcu_read_unlock();
1165 }
1166
1167
1168 /*
1169  * Show one entry in /proc file.
1170  */
1171 static int irlan_seq_show(struct seq_file *seq, void *v)
1172 {
1173         if (v == SEQ_START_TOKEN)
1174                 seq_puts(seq, "IrLAN instances:\n");
1175         else {
1176                 struct irlan_cb *self = v;
1177
1178                 IRDA_ASSERT(self != NULL, return -1;);
1179                 IRDA_ASSERT(self->magic == IRLAN_MAGIC, return -1;);
1180
1181                 seq_printf(seq,"ifname: %s,\n",
1182                                self->dev->name);
1183                 seq_printf(seq,"client state: %s, ",
1184                                irlan_state[ self->client.state]);
1185                 seq_printf(seq,"provider state: %s,\n",
1186                                irlan_state[ self->provider.state]);
1187                 seq_printf(seq,"saddr: %#08x, ",
1188                                self->saddr);
1189                 seq_printf(seq,"daddr: %#08x\n",
1190                                self->daddr);
1191                 seq_printf(seq,"version: %d.%d,\n",
1192                                self->version[1], self->version[0]);
1193                 seq_printf(seq,"access type: %s\n",
1194                                irlan_access[self->client.access_type]);
1195                 seq_printf(seq,"media: %s\n",
1196                                irlan_media[self->media]);
1197
1198                 seq_printf(seq,"local filter:\n");
1199                 seq_printf(seq,"remote filter: ");
1200                 irlan_print_filter(seq, self->client.filter_type);
1201                 seq_printf(seq,"tx busy: %s\n",
1202                                netif_queue_stopped(self->dev) ? "TRUE" : "FALSE");
1203
1204                 seq_putc(seq,'\n');
1205         }
1206         return 0;
1207 }
1208
1209 static const struct seq_operations irlan_seq_ops = {
1210         .start = irlan_seq_start,
1211         .next  = irlan_seq_next,
1212         .stop  = irlan_seq_stop,
1213         .show  = irlan_seq_show,
1214 };
1215
1216 static int irlan_seq_open(struct inode *inode, struct file *file)
1217 {
1218         return seq_open(file, &irlan_seq_ops);
1219 }
1220 #endif
1221
1222 MODULE_AUTHOR("Dag Brattli <dagb@cs.uit.no>");
1223 MODULE_DESCRIPTION("The Linux IrDA LAN protocol");
1224 MODULE_LICENSE("GPL");
1225
1226 module_param(eth, bool, 0);
1227 MODULE_PARM_DESC(eth, "Name devices ethX (0) or irlanX (1)");
1228 module_param(access, int, 0);
1229 MODULE_PARM_DESC(access, "Access type DIRECT=1, PEER=2, HOSTED=3");
1230
1231 module_init(irlan_init);
1232 module_exit(irlan_cleanup);
1233