net/irda/irlan/irlan_common.c

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