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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/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 /*
  58  * Send gratuitous ARP when connected to a new AP or not. May be a clever
  59  * thing to do, but for some reason the machine crashes if you use DHCP. So
  60  * lets not use it by default.
  61  */
  62 #undef CONFIG_IRLAN_SEND_GRATUITOUS_ARP
  63
  64 /* extern char sysctl_devname[]; */
  65
  66 /*
  67  *  Master structure
  68  */
  69 static LIST_HEAD(irlans);
  70
  71 static void *ckey;
  72 static void *skey;
  73
  74 /* Module parameters */
  75 static int eth;   /* Use "eth" or "irlan" name for devices */
  76 static int access = ACCESS_PEER; /* PEER, DIRECT or HOSTED */
  77
  78 #ifdef CONFIG_PROC_FS
  79 static const char *irlan_access[] = {
  80         "UNKNOWN",
  81         "DIRECT",
  82         "PEER",
  83         "HOSTED"
  84 };
  85
  86 static const char *irlan_media[] = {
  87         "UNKNOWN",
  88         "802.3",
  89         "802.5"
  90 };
  91
  92 extern struct proc_dir_entry *proc_irda;
  93
  94 static int irlan_seq_open(struct inode *inode, struct file *file);
  95
  96 static const struct file_operations irlan_fops = {
  97         .owner   = THIS_MODULE,
  98         .open    = irlan_seq_open,
  99         .read    = seq_read,
 100         .llseek  = seq_lseek,
 101         .release = seq_release,
 102 };
 103
 104 extern struct proc_dir_entry *proc_irda;
 105 #endif /* CONFIG_PROC_FS */
 106
 107 static struct irlan_cb *irlan_open(__u32 saddr, __u32 daddr);
 108 static void __irlan_close(struct irlan_cb *self);
 109 static int __irlan_insert_param(struct sk_buff *skb, char *param, int type,
 110                                 __u8 value_byte, __u16 value_short,
 111                                 __u8 *value_array, __u16 value_len);
 112 static void irlan_open_unicast_addr(struct irlan_cb *self);
 113 static void irlan_get_unicast_addr(struct irlan_cb *self);
 114 void irlan_close_tsaps(struct irlan_cb *self);
 115
 116 /*
 117  * Function irlan_init (void)
 118  *
 119  *    Initialize IrLAN layer
 120  *
 121  */
 122 static int __init irlan_init(void)
 123 {
 124         struct irlan_cb *new;
 125         __u16 hints;
 126
 127         IRDA_DEBUG(2, "%s()\n", __FUNCTION__ );
 128
 129 #ifdef CONFIG_PROC_FS
 130         { struct proc_dir_entry *proc;
 131         proc = create_proc_entry("irlan", 0, proc_irda);
 132         if (!proc) {
 133                 printk(KERN_ERR "irlan_init: can't create /proc entry!\n");
 134                 return -ENODEV;
 135         }
 136
 137         proc->proc_fops = &irlan_fops;
 138         }
 139 #endif /* CONFIG_PROC_FS */
 140
 141         IRDA_DEBUG(4, "%s()\n", __FUNCTION__ );
 142         hints = irlmp_service_to_hint(S_LAN);
 143
 144         /* Register with IrLMP as a client */
 145         ckey = irlmp_register_client(hints, &irlan_client_discovery_indication,
 146                                      NULL, NULL);
 147         if (!ckey)
 148                 goto err_ckey;
 149
 150         /* Register with IrLMP as a service */
 151         skey = irlmp_register_service(hints);
 152         if (!skey)
 153                 goto err_skey;
 154
 155         /* Start the master IrLAN instance (the only one for now) */
 156         new = irlan_open(DEV_ADDR_ANY, DEV_ADDR_ANY);
 157         if (!new)
 158                 goto err_open;
 159
 160         /* The master will only open its (listen) control TSAP */
 161         irlan_provider_open_ctrl_tsap(new);
 162
 163         /* Do some fast discovery! */
 164         irlmp_discovery_request(DISCOVERY_DEFAULT_SLOTS);
 165
 166         return 0;
 167
 168 err_open:
 169         irlmp_unregister_service(skey);
 170 err_skey:
 171         irlmp_unregister_client(ckey);
 172 err_ckey:
 173 #ifdef CONFIG_PROC_FS
 174         remove_proc_entry("irlan", proc_irda);
 175 #endif /* CONFIG_PROC_FS */
 176
 177         return -ENOMEM;
 178 }
 179
 180 static void __exit irlan_cleanup(void)
 181 {
 182         struct irlan_cb *self, *next;
 183
 184         IRDA_DEBUG(4, "%s()\n", __FUNCTION__ );
 185
 186         irlmp_unregister_client(ckey);
 187         irlmp_unregister_service(skey);
 188
 189 #ifdef CONFIG_PROC_FS
 190         remove_proc_entry("irlan", proc_irda);
 191 #endif /* CONFIG_PROC_FS */
 192
 193         /* Cleanup any leftover network devices */
 194         rtnl_lock();
 195         list_for_each_entry_safe(self, next, &irlans, dev_list) {
 196                 __irlan_close(self);
 197         }
 198         rtnl_unlock();
 199 }
 200
 201 /*
 202  * Function irlan_open (void)
 203  *
 204  *    Open new instance of a client/provider, we should only register the
 205  *    network device if this instance is ment for a particular client/provider
 206  */
 207 static struct irlan_cb *irlan_open(__u32 saddr, __u32 daddr)
 208 {
 209         struct net_device *dev;
 210         struct irlan_cb *self;
 211
 212         IRDA_DEBUG(2, "%s()\n", __FUNCTION__ );
 213
 214         /* Create network device with irlan */
 215         dev = alloc_irlandev(eth ? "eth%d" : "irlan%d");
 216         if (!dev)
 217                 return NULL;
 218
 219         self = dev->priv;
 220         self->dev = dev;
 221
 222         /*
 223          *  Initialize local device structure
 224          */
 225         self->magic = IRLAN_MAGIC;
 226         self->saddr = saddr;
 227         self->daddr = daddr;
 228
 229         /* Provider access can only be PEER, DIRECT, or HOSTED */
 230         self->provider.access_type = access;
 231         if (access == ACCESS_DIRECT) {
 232                 /*
 233                  * Since we are emulating an IrLAN sever we will have to
 234                  * give ourself an ethernet address!
 235                  */
 236                 dev->dev_addr[0] = 0x40;
 237                 dev->dev_addr[1] = 0x00;
 238                 dev->dev_addr[2] = 0x00;
 239                 dev->dev_addr[3] = 0x00;
 240                 get_random_bytes(dev->dev_addr+4, 1);
 241                 get_random_bytes(dev->dev_addr+5, 1);
 242         }
 243
 244         self->media = MEDIA_802_3;
 245         self->disconnect_reason = LM_USER_REQUEST;
 246         init_timer(&self->watchdog_timer);
 247         init_timer(&self->client.kick_timer);
 248         init_waitqueue_head(&self->open_wait);
 249
 250         skb_queue_head_init(&self->client.txq);
 251
 252         irlan_next_client_state(self, IRLAN_IDLE);
 253         irlan_next_provider_state(self, IRLAN_IDLE);
 254
 255         if (register_netdev(dev)) {
 256                 IRDA_DEBUG(2, "%s(), register_netdev() failed!\n",
 257                            __FUNCTION__ );
 258                 self = NULL;
 259                 free_netdev(dev);
 260         } else {
 261                 rtnl_lock();
 262                 list_add_rcu(&self->dev_list, &irlans);
 263                 rtnl_unlock();
 264         }
 265
 266         return self;
 267 }
 268 /*
 269  * Function __irlan_close (self)
 270  *
 271  *    This function closes and deallocates the IrLAN client instances. Be
 272  *    aware that other functions which calls client_close() must
 273  *    remove self from irlans list first.
 274  */
 275 static void __irlan_close(struct irlan_cb *self)
 276 {
 277         IRDA_DEBUG(2, "%s()\n", __FUNCTION__ );
 278
 279         ASSERT_RTNL();
 280         IRDA_ASSERT(self != NULL, return;);
 281         IRDA_ASSERT(self->magic == IRLAN_MAGIC, return;);
 282
 283         del_timer_sync(&self->watchdog_timer);
 284         del_timer_sync(&self->client.kick_timer);
 285
 286         /* Close all open connections and remove TSAPs */
 287         irlan_close_tsaps(self);
 288
 289         if (self->client.iriap)
 290                 iriap_close(self->client.iriap);
 291
 292         /* Remove frames queued on the control channel */
 293         skb_queue_purge(&self->client.txq);
 294
 295         /* Unregister and free self via destructor */
 296         unregister_netdevice(self->dev);
 297 }
 298
 299 /* Find any instance of irlan, used for client discovery wakeup */
 300 struct irlan_cb *irlan_get_any(void)
 301 {
 302         struct irlan_cb *self;
 303
 304         list_for_each_entry_rcu(self, &irlans, dev_list) {
 305                 return self;
 306         }
 307         return NULL;
 308 }
 309
 310 /*
 311  * Function irlan_connect_indication (instance, sap, qos, max_sdu_size, skb)
 312  *
 313  *    Here we receive the connect indication for the data channel
 314  *
 315  */
 316 static void irlan_connect_indication(void *instance, void *sap,
 317                                      struct qos_info *qos,
 318                                      __u32 max_sdu_size,
 319                                      __u8 max_header_size,
 320                                      struct sk_buff *skb)
 321 {
 322         struct irlan_cb *self;
 323         struct tsap_cb *tsap;
 324
 325         IRDA_DEBUG(2, "%s()\n", __FUNCTION__ );
 326
 327         self = (struct irlan_cb *) instance;
 328         tsap = (struct tsap_cb *) sap;
 329
 330         IRDA_ASSERT(self != NULL, return;);
 331         IRDA_ASSERT(self->magic == IRLAN_MAGIC, return;);
 332         IRDA_ASSERT(tsap == self->tsap_data,return;);
 333
 334         self->max_sdu_size = max_sdu_size;
 335         self->max_header_size = max_header_size;
 336
 337         IRDA_DEBUG(0, "%s: We are now connected!\n", __FUNCTION__);
 338
 339         del_timer(&self->watchdog_timer);
 340
 341         /* If you want to pass the skb to *both* state machines, you will
 342          * need to skb_clone() it, so that you don't free it twice.
 343          * As the state machines don't need it, git rid of it here...
 344          * Jean II */
 345         if (skb)
 346                 dev_kfree_skb(skb);
 347
 348         irlan_do_provider_event(self, IRLAN_DATA_CONNECT_INDICATION, NULL);
 349         irlan_do_client_event(self, IRLAN_DATA_CONNECT_INDICATION, NULL);
 350
 351         if (self->provider.access_type == ACCESS_PEER) {
 352                 /*
 353                  * Data channel is open, so we are now allowed to
 354                  * configure the remote filter
 355                  */
 356                 irlan_get_unicast_addr(self);
 357                 irlan_open_unicast_addr(self);
 358         }
 359         /* Ready to transfer Ethernet frames (at last) */
 360         netif_start_queue(self->dev); /* Clear reason */
 361 }
 362
 363 static void irlan_connect_confirm(void *instance, void *sap,
 364                                   struct qos_info *qos,
 365                                   __u32 max_sdu_size,
 366                                   __u8 max_header_size,
 367                                   struct sk_buff *skb)
 368 {
 369         struct irlan_cb *self;
 370
 371         self = (struct irlan_cb *) instance;
 372
 373         IRDA_ASSERT(self != NULL, return;);
 374         IRDA_ASSERT(self->magic == IRLAN_MAGIC, return;);
 375
 376         self->max_sdu_size = max_sdu_size;
 377         self->max_header_size = max_header_size;
 378
 379         /* TODO: we could set the MTU depending on the max_sdu_size */
 380
 381         IRDA_DEBUG(0, "%s: We are now connected!\n", __FUNCTION__);
 382         del_timer(&self->watchdog_timer);
 383
 384         /*
 385          * Data channel is open, so we are now allowed to configure the remote
 386          * filter
 387          */
 388         irlan_get_unicast_addr(self);
 389         irlan_open_unicast_addr(self);
 390
 391         /* Open broadcast and multicast filter by default */
 392         irlan_set_broadcast_filter(self, TRUE);
 393         irlan_set_multicast_filter(self, TRUE);
 394
 395         /* Ready to transfer Ethernet frames */
 396         netif_start_queue(self->dev);
 397         self->disconnect_reason = 0; /* Clear reason */
 398 #ifdef CONFIG_IRLAN_SEND_GRATUITOUS_ARP
 399         irlan_eth_send_gratuitous_arp(&self->dev);
 400 #endif
 401         wake_up_interruptible(&self->open_wait);
 402 }
 403
 404 /*
 405  * Function irlan_client_disconnect_indication (handle)
 406  *
 407  *    Callback function for the IrTTP layer. Indicates a disconnection of
 408  *    the specified connection (handle)
 409  */
 410 static void irlan_disconnect_indication(void *instance,
 411                                         void *sap, LM_REASON reason,
 412                                         struct sk_buff *userdata)
 413 {
 414         struct irlan_cb *self;
 415         struct tsap_cb *tsap;
 416
 417         IRDA_DEBUG(0, "%s(), reason=%d\n", __FUNCTION__ , reason);
 418
 419         self = (struct irlan_cb *) instance;
 420         tsap = (struct tsap_cb *) sap;
 421
 422         IRDA_ASSERT(self != NULL, return;);
 423         IRDA_ASSERT(self->magic == IRLAN_MAGIC, return;);
 424         IRDA_ASSERT(tsap != NULL, return;);
 425         IRDA_ASSERT(tsap->magic == TTP_TSAP_MAGIC, return;);
 426
 427         IRDA_ASSERT(tsap == self->tsap_data, return;);
 428
 429         IRDA_DEBUG(2, "IrLAN, data channel disconnected by peer!\n");
 430
 431         /* Save reason so we know if we should try to reconnect or not */
 432         self->disconnect_reason = reason;
 433
 434         switch (reason) {
 435         case LM_USER_REQUEST: /* User request */
 436                 IRDA_DEBUG(2, "%s(), User requested\n", __FUNCTION__ );
 437                 break;
 438         case LM_LAP_DISCONNECT: /* Unexpected IrLAP disconnect */
 439                 IRDA_DEBUG(2, "%s(), Unexpected IrLAP disconnect\n", __FUNCTION__ );
 440                 break;
 441         case LM_CONNECT_FAILURE: /* Failed to establish IrLAP connection */
 442                 IRDA_DEBUG(2, "%s(), IrLAP connect failed\n", __FUNCTION__ );
 443                 break;
 444         case LM_LAP_RESET:  /* IrLAP reset */
 445                 IRDA_DEBUG(2, "%s(), IrLAP reset\n", __FUNCTION__ );
 446                 break;
 447         case LM_INIT_DISCONNECT:
 448                 IRDA_DEBUG(2, "%s(), IrLMP connect failed\n", __FUNCTION__ );
 449                 break;
 450         default:
 451                 IRDA_ERROR("%s(), Unknown disconnect reason\n", __FUNCTION__);
 452                 break;
 453         }
 454
 455         /* If you want to pass the skb to *both* state machines, you will
 456          * need to skb_clone() it, so that you don't free it twice.
 457          * As the state machines don't need it, git rid of it here...
 458          * Jean II */
 459         if (userdata)
 460                 dev_kfree_skb(userdata);
 461
 462         irlan_do_client_event(self, IRLAN_LMP_DISCONNECT, NULL);
 463         irlan_do_provider_event(self, IRLAN_LMP_DISCONNECT, NULL);
 464
 465         wake_up_interruptible(&self->open_wait);
 466 }
 467
 468 void irlan_open_data_tsap(struct irlan_cb *self)
 469 {
 470         struct tsap_cb *tsap;
 471         notify_t notify;
 472
 473         IRDA_DEBUG(2, "%s()\n", __FUNCTION__ );
 474
 475         IRDA_ASSERT(self != NULL, return;);
 476         IRDA_ASSERT(self->magic == IRLAN_MAGIC, return;);
 477
 478         /* Check if already open */
 479         if (self->tsap_data)
 480                 return;
 481
 482         irda_notify_init(&notify);
 483
 484         notify.data_indication       = irlan_eth_receive;
 485         notify.udata_indication      = irlan_eth_receive;
 486         notify.connect_indication    = irlan_connect_indication;
 487         notify.connect_confirm       = irlan_connect_confirm;
 488         notify.flow_indication       = irlan_eth_flow_indication;
 489         notify.disconnect_indication = irlan_disconnect_indication;
 490         notify.instance              = self;
 491         strlcpy(notify.name, "IrLAN data", sizeof(notify.name));
 492
 493         tsap = irttp_open_tsap(LSAP_ANY, DEFAULT_INITIAL_CREDIT, &notify);
 494         if (!tsap) {
 495                 IRDA_DEBUG(2, "%s(), Got no tsap!\n", __FUNCTION__ );
 496                 return;
 497         }
 498         self->tsap_data = tsap;
 499
 500         /*
 501          *  This is the data TSAP selector which we will pass to the client
 502          *  when the client ask for it.
 503          */
 504         self->stsap_sel_data = self->tsap_data->stsap_sel;
 505 }
 506
 507 void irlan_close_tsaps(struct irlan_cb *self)
 508 {
 509         IRDA_DEBUG(4, "%s()\n", __FUNCTION__ );
 510
 511         IRDA_ASSERT(self != NULL, return;);
 512         IRDA_ASSERT(self->magic == IRLAN_MAGIC, return;);
 513
 514         /* Disconnect and close all open TSAP connections */
 515         if (self->tsap_data) {
 516                 irttp_disconnect_request(self->tsap_data, NULL, P_NORMAL);
 517                 irttp_close_tsap(self->tsap_data);
 518                 self->tsap_data = NULL;
 519         }
 520         if (self->client.tsap_ctrl) {
 521                 irttp_disconnect_request(self->client.tsap_ctrl, NULL,
 522                                          P_NORMAL);
 523                 irttp_close_tsap(self->client.tsap_ctrl);
 524                 self->client.tsap_ctrl = NULL;
 525         }
 526         if (self->provider.tsap_ctrl) {
 527                 irttp_disconnect_request(self->provider.tsap_ctrl, NULL,
 528                                          P_NORMAL);
 529                 irttp_close_tsap(self->provider.tsap_ctrl);
 530                 self->provider.tsap_ctrl = NULL;
 531         }
 532         self->disconnect_reason = LM_USER_REQUEST;
 533 }
 534
 535 /*
 536  * Function irlan_ias_register (self, tsap_sel)
 537  *
 538  *    Register with LM-IAS
 539  *
 540  */
 541 void irlan_ias_register(struct irlan_cb *self, __u8 tsap_sel)
 542 {
 543         struct ias_object *obj;
 544         struct ias_value *new_value;
 545
 546         IRDA_ASSERT(self != NULL, return;);
 547         IRDA_ASSERT(self->magic == IRLAN_MAGIC, return;);
 548
 549         /*
 550          * Check if object has already been registered by a previous provider.
 551          * If that is the case, we just change the value of the attribute
 552          */
 553         if (!irias_find_object("IrLAN")) {
 554                 obj = irias_new_object("IrLAN", IAS_IRLAN_ID);
 555                 irias_add_integer_attrib(obj, "IrDA:TinyTP:LsapSel", tsap_sel,
 556                                          IAS_KERNEL_ATTR);
 557                 irias_insert_object(obj);
 558         } else {
 559                 new_value = irias_new_integer_value(tsap_sel);
 560                 irias_object_change_attribute("IrLAN", "IrDA:TinyTP:LsapSel",
 561                                               new_value);
 562         }
 563
 564         /* Register PnP object only if not registered before */
 565         if (!irias_find_object("PnP")) {
 566                 obj = irias_new_object("PnP", IAS_PNP_ID);
 567 #if 0
 568                 irias_add_string_attrib(obj, "Name", sysctl_devname,
 569                                         IAS_KERNEL_ATTR);
 570 #else
 571                 irias_add_string_attrib(obj, "Name", "Linux", IAS_KERNEL_ATTR);
 572 #endif
 573                 irias_add_string_attrib(obj, "DeviceID", "HWP19F0",
 574                                         IAS_KERNEL_ATTR);
 575                 irias_add_integer_attrib(obj, "CompCnt", 1, IAS_KERNEL_ATTR);
 576                 if (self->provider.access_type == ACCESS_PEER)
 577                         irias_add_string_attrib(obj, "Comp#01", "PNP8389",
 578                                                 IAS_KERNEL_ATTR);
 579                 else
 580                         irias_add_string_attrib(obj, "Comp#01", "PNP8294",
 581                                                 IAS_KERNEL_ATTR);
 582
 583                 irias_add_string_attrib(obj, "Manufacturer",
 584                                         "Linux-IrDA Project", IAS_KERNEL_ATTR);
 585                 irias_insert_object(obj);
 586         }
 587 }
 588
 589 /*
 590  * Function irlan_run_ctrl_tx_queue (self)
 591  *
 592  *    Try to send the next command in the control transmit queue
 593  *
 594  */
 595 int irlan_run_ctrl_tx_queue(struct irlan_cb *self)
 596 {
 597         struct sk_buff *skb;
 598
 599         IRDA_DEBUG(2, "%s()\n", __FUNCTION__ );
 600
 601         if (irda_lock(&self->client.tx_busy) == FALSE)
 602                 return -EBUSY;
 603
 604         skb = skb_dequeue(&self->client.txq);
 605         if (!skb) {
 606                 self->client.tx_busy = FALSE;
 607                 return 0;
 608         }
 609
 610         /* Check that it's really possible to send commands */
 611         if ((self->client.tsap_ctrl == NULL) ||
 612             (self->client.state == IRLAN_IDLE))
 613         {
 614                 self->client.tx_busy = FALSE;
 615                 dev_kfree_skb(skb);
 616                 return -1;
 617         }
 618         IRDA_DEBUG(2, "%s(), sending ...\n", __FUNCTION__ );
 619
 620         return irttp_data_request(self->client.tsap_ctrl, skb);
 621 }
 622
 623 /*
 624  * Function irlan_ctrl_data_request (self, skb)
 625  *
 626  *    This function makes sure that commands on the control channel is being
 627  *    sent in a command/response fashion
 628  */
 629 static void irlan_ctrl_data_request(struct irlan_cb *self, struct sk_buff *skb)
 630 {
 631         IRDA_DEBUG(2, "%s()\n", __FUNCTION__ );
 632
 633         /* Queue command */
 634         skb_queue_tail(&self->client.txq, skb);
 635
 636         /* Try to send command */
 637         irlan_run_ctrl_tx_queue(self);
 638 }
 639
 640 /*
 641  * Function irlan_get_provider_info (self)
 642  *
 643  *    Send Get Provider Information command to peer IrLAN layer
 644  *
 645  */
 646 void irlan_get_provider_info(struct irlan_cb *self)
 647 {
 648         struct sk_buff *skb;
 649         __u8 *frame;
 650
 651         IRDA_DEBUG(4, "%s()\n", __FUNCTION__ );
 652
 653         IRDA_ASSERT(self != NULL, return;);
 654         IRDA_ASSERT(self->magic == IRLAN_MAGIC, return;);
 655
 656         skb = alloc_skb(IRLAN_MAX_HEADER + IRLAN_CMD_HEADER,
 657                         GFP_ATOMIC);
 658         if (!skb)
 659                 return;
 660
 661         /* Reserve space for TTP, LMP, and LAP header */
 662         skb_reserve(skb, self->client.max_header_size);
 663         skb_put(skb, 2);
 664
 665         frame = skb->data;
 666
 667         frame[0] = CMD_GET_PROVIDER_INFO;
 668         frame[1] = 0x00;                 /* Zero parameters */
 669
 670         irlan_ctrl_data_request(self, skb);
 671 }
 672
 673 /*
 674  * Function irlan_open_data_channel (self)
 675  *
 676  *    Send an Open Data Command to provider
 677  *
 678  */
 679 void irlan_open_data_channel(struct irlan_cb *self)
 680 {
 681         struct sk_buff *skb;
 682         __u8 *frame;
 683
 684         IRDA_DEBUG(4, "%s()\n", __FUNCTION__ );
 685
 686         IRDA_ASSERT(self != NULL, return;);
 687         IRDA_ASSERT(self->magic == IRLAN_MAGIC, return;);
 688
 689         skb = alloc_skb(IRLAN_MAX_HEADER + IRLAN_CMD_HEADER +
 690                         IRLAN_STRING_PARAMETER_LEN("MEDIA", "802.3") +
 691                         IRLAN_STRING_PARAMETER_LEN("ACCESS_TYPE", "DIRECT"),
 692                         GFP_ATOMIC);
 693         if (!skb)
 694                 return;
 695
 696         skb_reserve(skb, self->client.max_header_size);
 697         skb_put(skb, 2);
 698
 699         frame = skb->data;
 700
 701         /* Build frame */
 702         frame[0] = CMD_OPEN_DATA_CHANNEL;
 703         frame[1] = 0x02; /* Two parameters */
 704
 705         irlan_insert_string_param(skb, "MEDIA", "802.3");
 706         irlan_insert_string_param(skb, "ACCESS_TYPE", "DIRECT");
 707         /* irlan_insert_string_param(skb, "MODE", "UNRELIABLE"); */
 708
 709 /*      self->use_udata = TRUE; */
 710
 711         irlan_ctrl_data_request(self, skb);
 712 }
 713
 714 void irlan_close_data_channel(struct irlan_cb *self)
 715 {
 716         struct sk_buff *skb;
 717         __u8 *frame;
 718
 719         IRDA_DEBUG(4, "%s()\n", __FUNCTION__ );
 720
 721         IRDA_ASSERT(self != NULL, return;);
 722         IRDA_ASSERT(self->magic == IRLAN_MAGIC, return;);
 723
 724         /* Check if the TSAP is still there */
 725         if (self->client.tsap_ctrl == NULL)
 726                 return;
 727
 728         skb = alloc_skb(IRLAN_MAX_HEADER + IRLAN_CMD_HEADER +
 729                         IRLAN_BYTE_PARAMETER_LEN("DATA_CHAN"),
 730                         GFP_ATOMIC);
 731         if (!skb)
 732                 return;
 733
 734         skb_reserve(skb, self->client.max_header_size);
 735         skb_put(skb, 2);
 736
 737         frame = skb->data;
 738
 739         /* Build frame */
 740         frame[0] = CMD_CLOSE_DATA_CHAN;
 741         frame[1] = 0x01; /* One parameter */
 742
 743         irlan_insert_byte_param(skb, "DATA_CHAN", self->dtsap_sel_data);
 744
 745         irlan_ctrl_data_request(self, skb);
 746 }
 747
 748 /*
 749  * Function irlan_open_unicast_addr (self)
 750  *
 751  *    Make IrLAN provider accept ethernet frames addressed to the unicast
 752  *    address.
 753  *
 754  */
 755 static void irlan_open_unicast_addr(struct irlan_cb *self)
 756 {
 757         struct sk_buff *skb;
 758         __u8 *frame;
 759
 760         IRDA_DEBUG(4, "%s()\n", __FUNCTION__ );
 761
 762         IRDA_ASSERT(self != NULL, return;);
 763         IRDA_ASSERT(self->magic == IRLAN_MAGIC, return;);
 764
 765         skb = alloc_skb(IRLAN_MAX_HEADER + IRLAN_CMD_HEADER +
 766                         IRLAN_BYTE_PARAMETER_LEN("DATA_CHAN") +
 767                         IRLAN_STRING_PARAMETER_LEN("FILTER_TYPE", "DIRECTED") +
 768                         IRLAN_STRING_PARAMETER_LEN("FILTER_MODE", "FILTER"),
 769                         GFP_ATOMIC);
 770         if (!skb)
 771                 return;
 772
 773         /* Reserve space for TTP, LMP, and LAP header */
 774         skb_reserve(skb, self->max_header_size);
 775         skb_put(skb, 2);
 776
 777         frame = skb->data;
 778
 779         frame[0] = CMD_FILTER_OPERATION;
 780         frame[1] = 0x03;                 /* Three parameters */
 781         irlan_insert_byte_param(skb, "DATA_CHAN" , self->dtsap_sel_data);
 782         irlan_insert_string_param(skb, "FILTER_TYPE", "DIRECTED");
 783         irlan_insert_string_param(skb, "FILTER_MODE", "FILTER");
 784
 785         irlan_ctrl_data_request(self, skb);
 786 }
 787
 788 /*
 789  * Function irlan_set_broadcast_filter (self, status)
 790  *
 791  *    Make IrLAN provider accept ethernet frames addressed to the broadcast
 792  *    address. Be careful with the use of this one, since there may be a lot
 793  *    of broadcast traffic out there. We can still function without this
 794  *    one but then _we_ have to initiate all communication with other
 795  *    hosts, since ARP request for this host will not be answered.
 796  */
 797 void irlan_set_broadcast_filter(struct irlan_cb *self, int status)
 798 {
 799         struct sk_buff *skb;
 800         __u8 *frame;
 801
 802         IRDA_DEBUG(2, "%s()\n", __FUNCTION__ );
 803
 804         IRDA_ASSERT(self != NULL, return;);
 805         IRDA_ASSERT(self->magic == IRLAN_MAGIC, return;);
 806
 807         skb = alloc_skb(IRLAN_MAX_HEADER + IRLAN_CMD_HEADER +
 808                         IRLAN_BYTE_PARAMETER_LEN("DATA_CHAN") +
 809                         IRLAN_STRING_PARAMETER_LEN("FILTER_TYPE", "BROADCAST") +
 810                         /* We may waste one byte here...*/
 811                         IRLAN_STRING_PARAMETER_LEN("FILTER_MODE", "FILTER"),
 812                         GFP_ATOMIC);
 813         if (!skb)
 814                 return;
 815
 816         /* Reserve space for TTP, LMP, and LAP header */
 817         skb_reserve(skb, self->client.max_header_size);
 818         skb_put(skb, 2);
 819
 820         frame = skb->data;
 821
 822         frame[0] = CMD_FILTER_OPERATION;
 823         frame[1] = 0x03;                 /* Three parameters */
 824         irlan_insert_byte_param(skb, "DATA_CHAN", self->dtsap_sel_data);
 825         irlan_insert_string_param(skb, "FILTER_TYPE", "BROADCAST");
 826         if (status)
 827                 irlan_insert_string_param(skb, "FILTER_MODE", "FILTER");
 828         else
 829                 irlan_insert_string_param(skb, "FILTER_MODE", "NONE");
 830
 831         irlan_ctrl_data_request(self, skb);
 832 }
 833
 834 /*
 835  * Function irlan_set_multicast_filter (self, status)
 836  *
 837  *    Make IrLAN provider accept ethernet frames addressed to the multicast
 838  *    address.
 839  *
 840  */
 841 void irlan_set_multicast_filter(struct irlan_cb *self, int status)
 842 {
 843         struct sk_buff *skb;
 844         __u8 *frame;
 845
 846         IRDA_DEBUG(2, "%s()\n", __FUNCTION__ );
 847
 848         IRDA_ASSERT(self != NULL, return;);
 849         IRDA_ASSERT(self->magic == IRLAN_MAGIC, return;);
 850
 851         skb = alloc_skb(IRLAN_MAX_HEADER + IRLAN_CMD_HEADER +
 852                         IRLAN_BYTE_PARAMETER_LEN("DATA_CHAN") +
 853                         IRLAN_STRING_PARAMETER_LEN("FILTER_TYPE", "MULTICAST") +
 854                         /* We may waste one byte here...*/
 855                         IRLAN_STRING_PARAMETER_LEN("FILTER_MODE", "NONE"),
 856                         GFP_ATOMIC);
 857         if (!skb)
 858                 return;
 859
 860         /* Reserve space for TTP, LMP, and LAP header */
 861         skb_reserve(skb, self->client.max_header_size);
 862         skb_put(skb, 2);
 863
 864         frame = skb->data;
 865
 866         frame[0] = CMD_FILTER_OPERATION;
 867         frame[1] = 0x03;                 /* Three parameters */
 868         irlan_insert_byte_param(skb, "DATA_CHAN", self->dtsap_sel_data);
 869         irlan_insert_string_param(skb, "FILTER_TYPE", "MULTICAST");
 870         if (status)
 871                 irlan_insert_string_param(skb, "FILTER_MODE", "ALL");
 872         else
 873                 irlan_insert_string_param(skb, "FILTER_MODE", "NONE");
 874
 875         irlan_ctrl_data_request(self, skb);
 876 }
 877
 878 /*
 879  * Function irlan_get_unicast_addr (self)
 880  *
 881  *    Retrieves the unicast address from the IrLAN provider. This address
 882  *    will be inserted into the devices structure, so the ethernet layer
 883  *    can construct its packets.
 884  *
 885  */
 886 static void irlan_get_unicast_addr(struct irlan_cb *self)
 887 {
 888         struct sk_buff *skb;
 889         __u8 *frame;
 890
 891         IRDA_DEBUG(2, "%s()\n", __FUNCTION__ );
 892
 893         IRDA_ASSERT(self != NULL, return;);
 894         IRDA_ASSERT(self->magic == IRLAN_MAGIC, return;);
 895
 896         skb = alloc_skb(IRLAN_MAX_HEADER + IRLAN_CMD_HEADER +
 897                         IRLAN_BYTE_PARAMETER_LEN("DATA_CHAN") +
 898                         IRLAN_STRING_PARAMETER_LEN("FILTER_TYPE", "DIRECTED") +
 899                         IRLAN_STRING_PARAMETER_LEN("FILTER_OPERATION",
 900                                                    "DYNAMIC"),
 901                         GFP_ATOMIC);
 902         if (!skb)
 903                 return;
 904
 905         /* Reserve space for TTP, LMP, and LAP header */
 906         skb_reserve(skb, self->client.max_header_size);
 907         skb_put(skb, 2);
 908
 909         frame = skb->data;
 910
 911         frame[0] = CMD_FILTER_OPERATION;
 912         frame[1] = 0x03;                 /* Three parameters */
 913         irlan_insert_byte_param(skb, "DATA_CHAN", self->dtsap_sel_data);
 914         irlan_insert_string_param(skb, "FILTER_TYPE", "DIRECTED");
 915         irlan_insert_string_param(skb, "FILTER_OPERATION", "DYNAMIC");
 916
 917         irlan_ctrl_data_request(self, skb);
 918 }
 919
 920 /*
 921  * Function irlan_get_media_char (self)
 922  *
 923  *
 924  *
 925  */
 926 void irlan_get_media_char(struct irlan_cb *self)
 927 {
 928         struct sk_buff *skb;
 929         __u8 *frame;
 930
 931         IRDA_DEBUG(4, "%s()\n", __FUNCTION__ );
 932
 933         IRDA_ASSERT(self != NULL, return;);
 934         IRDA_ASSERT(self->magic == IRLAN_MAGIC, return;);
 935
 936         skb = alloc_skb(IRLAN_MAX_HEADER + IRLAN_CMD_HEADER +
 937                         IRLAN_STRING_PARAMETER_LEN("MEDIA", "802.3"),
 938                         GFP_ATOMIC);
 939
 940         if (!skb)
 941                 return;
 942
 943         /* Reserve space for TTP, LMP, and LAP header */
 944         skb_reserve(skb, self->client.max_header_size);
 945         skb_put(skb, 2);
 946
 947         frame = skb->data;
 948
 949         /* Build frame */
 950         frame[0] = CMD_GET_MEDIA_CHAR;
 951         frame[1] = 0x01; /* One parameter */
 952
 953         irlan_insert_string_param(skb, "MEDIA", "802.3");
 954         irlan_ctrl_data_request(self, skb);
 955 }
 956
 957 /*
 958  * Function insert_byte_param (skb, param, value)
 959  *
 960  *    Insert byte parameter into frame
 961  *
 962  */
 963 int irlan_insert_byte_param(struct sk_buff *skb, char *param, __u8 value)
 964 {
 965         return __irlan_insert_param(skb, param, IRLAN_BYTE, value, 0, NULL, 0);
 966 }
 967
 968 int irlan_insert_short_param(struct sk_buff *skb, char *param, __u16 value)
 969 {
 970         return __irlan_insert_param(skb, param, IRLAN_SHORT, 0, value, NULL, 0);
 971 }
 972
 973 /*
 974  * Function insert_string (skb, param, value)
 975  *
 976  *    Insert string parameter into frame
 977  *
 978  */
 979 int irlan_insert_string_param(struct sk_buff *skb, char *param, char *string)
 980 {
 981         int string_len = strlen(string);
 982
 983         return __irlan_insert_param(skb, param, IRLAN_ARRAY, 0, 0, string,
 984                                     string_len);
 985 }
 986
 987 /*
 988  * Function insert_array_param(skb, param, value, len_value)
 989  *
 990  *    Insert array parameter into frame
 991  *
 992  */
 993 int irlan_insert_array_param(struct sk_buff *skb, char *name, __u8 *array,
 994                              __u16 array_len)
 995 {
 996         return __irlan_insert_param(skb, name, IRLAN_ARRAY, 0, 0, array,
 997                                     array_len);
 998 }
 999
1000 /*
1001  * Function insert_param (skb, param, value, byte)
1002  *
1003  *    Insert parameter at end of buffer, structure of a parameter is:
1004  *
1005  *    -----------------------------------------------------------------------
1006  *    | Name Length[1] | Param Name[1..255] | Val Length[2] | Value[0..1016]|
1007  *    -----------------------------------------------------------------------
1008  */
1009 static int __irlan_insert_param(struct sk_buff *skb, char *param, int type,
1010                                 __u8 value_byte, __u16 value_short,
1011                                 __u8 *value_array, __u16 value_len)
1012 {
1013         __u8 *frame;
1014         __u8 param_len;
1015         __le16 tmp_le; /* Temporary value in little endian format */
1016         int n=0;
1017
1018         if (skb == NULL) {
1019                 IRDA_DEBUG(2, "%s(), Got NULL skb\n", __FUNCTION__ );
1020                 return 0;
1021         }
1022
1023         param_len = strlen(param);
1024         switch (type) {
1025         case IRLAN_BYTE:
1026                 value_len = 1;
1027                 break;
1028         case IRLAN_SHORT:
1029                 value_len = 2;
1030                 break;
1031         case IRLAN_ARRAY:
1032                 IRDA_ASSERT(value_array != NULL, return 0;);
1033                 IRDA_ASSERT(value_len > 0, return 0;);
1034                 break;
1035         default:
1036                 IRDA_DEBUG(2, "%s(), Unknown parameter type!\n", __FUNCTION__ );
1037                 return 0;
1038                 break;
1039         }
1040
1041         /* Insert at end of sk-buffer */
1042         frame = skb->tail;
1043
1044         /* Make space for data */
1045         if (skb_tailroom(skb) < (param_len+value_len+3)) {
1046                 IRDA_DEBUG(2, "%s(), No more space at end of skb\n", __FUNCTION__ );
1047                 return 0;
1048         }
1049         skb_put(skb, param_len+value_len+3);
1050
1051         /* Insert parameter length */
1052         frame[n++] = param_len;
1053
1054         /* Insert parameter */
1055         memcpy(frame+n, param, param_len); n += param_len;
1056
1057         /* Insert value length (2 byte little endian format, LSB first) */
1058         tmp_le = cpu_to_le16(value_len);
1059         memcpy(frame+n, &tmp_le, 2); n += 2; /* To avoid alignment problems */
1060
1061         /* Insert value */
1062         switch (type) {
1063         case IRLAN_BYTE:
1064                 frame[n++] = value_byte;
1065                 break;
1066         case IRLAN_SHORT:
1067                 tmp_le = cpu_to_le16(value_short);
1068                 memcpy(frame+n, &tmp_le, 2); n += 2;
1069                 break;
1070         case IRLAN_ARRAY:
1071                 memcpy(frame+n, value_array, value_len); n+=value_len;
1072                 break;
1073         default:
1074                 break;
1075         }
1076         IRDA_ASSERT(n == (param_len+value_len+3), return 0;);
1077
1078         return param_len+value_len+3;
1079 }
1080
1081 /*
1082  * Function irlan_extract_param (buf, name, value, len)
1083  *
1084  *    Extracts a single parameter name/value pair from buffer and updates
1085  *    the buffer pointer to point to the next name/value pair.
1086  */
1087 int irlan_extract_param(__u8 *buf, char *name, char *value, __u16 *len)
1088 {
1089         __u8 name_len;
1090         __u16 val_len;
1091         int n=0;
1092
1093         IRDA_DEBUG(4, "%s()\n", __FUNCTION__ );
1094
1095         /* get length of parameter name (1 byte) */
1096         name_len = buf[n++];
1097
1098         if (name_len > 254) {
1099                 IRDA_DEBUG(2, "%s(), name_len > 254\n", __FUNCTION__ );
1100                 return -RSP_INVALID_COMMAND_FORMAT;
1101         }
1102
1103         /* get parameter name */
1104         memcpy(name, buf+n, name_len);
1105         name[name_len] = '\0';
1106         n+=name_len;
1107
1108         /*
1109          *  Get length of parameter value (2 bytes in little endian
1110          *  format)
1111          */
1112         memcpy(&val_len, buf+n, 2); /* To avoid alignment problems */
1113         le16_to_cpus(&val_len); n+=2;
1114
1115         if (val_len > 1016) {
1116                 IRDA_DEBUG(2, "%s(), parameter length to long\n", __FUNCTION__ );
1117                 return -RSP_INVALID_COMMAND_FORMAT;
1118         }
1119         *len = val_len;
1120
1121         /* get parameter value */
1122         memcpy(value, buf+n, val_len);
1123         value[val_len] = '\0';
1124         n+=val_len;
1125
1126         IRDA_DEBUG(4, "Parameter: %s ", name);
1127         IRDA_DEBUG(4, "Value: %s\n", value);
1128
1129         return n;
1130 }
1131
1132 #ifdef CONFIG_PROC_FS
1133
1134 /*
1135  * Start of reading /proc entries.
1136  * Return entry at pos,
1137  *      or start_token to indicate print header line
1138  *      or NULL if end of file
1139  */
1140 static void *irlan_seq_start(struct seq_file *seq, loff_t *pos)
1141 {
1142         int i = 1;
1143         struct irlan_cb *self;
1144
1145         rcu_read_lock();
1146         if (*pos == 0)
1147                 return SEQ_START_TOKEN;
1148
1149         list_for_each_entry(self, &irlans, dev_list) {
1150                 if (*pos == i)
1151                         return self;
1152                 ++i;
1153         }
1154         return NULL;
1155 }
1156
1157 /* Return entry after v, and increment pos */
1158 static void *irlan_seq_next(struct seq_file *seq, void *v, loff_t *pos)
1159 {
1160         struct list_head *nxt;
1161
1162         ++*pos;
1163         if (v == SEQ_START_TOKEN)
1164                 nxt = irlans.next;
1165         else
1166                 nxt = ((struct irlan_cb *)v)->dev_list.next;
1167
1168         return (nxt == &irlans) ? NULL
1169                 : list_entry(nxt, struct irlan_cb, dev_list);
1170 }
1171
1172 /* End of reading /proc file */
1173 static void irlan_seq_stop(struct seq_file *seq, void *v)
1174 {
1175         rcu_read_unlock();
1176 }
1177
1178
1179 /*
1180  * Show one entry in /proc file.
1181  */
1182 static int irlan_seq_show(struct seq_file *seq, void *v)
1183 {
1184         if (v == SEQ_START_TOKEN)
1185                 seq_puts(seq, "IrLAN instances:\n");
1186         else {
1187                 struct irlan_cb *self = v;
1188
1189                 IRDA_ASSERT(self != NULL, return -1;);
1190                 IRDA_ASSERT(self->magic == IRLAN_MAGIC, return -1;);
1191
1192                 seq_printf(seq,"ifname: %s,\n",
1193                                self->dev->name);
1194                 seq_printf(seq,"client state: %s, ",
1195                                irlan_state[ self->client.state]);
1196                 seq_printf(seq,"provider state: %s,\n",
1197                                irlan_state[ self->provider.state]);
1198                 seq_printf(seq,"saddr: %#08x, ",
1199                                self->saddr);
1200                 seq_printf(seq,"daddr: %#08x\n",
1201                                self->daddr);
1202                 seq_printf(seq,"version: %d.%d,\n",
1203                                self->version[1], self->version[0]);
1204                 seq_printf(seq,"access type: %s\n",
1205                                irlan_access[self->client.access_type]);
1206                 seq_printf(seq,"media: %s\n",
1207                                irlan_media[self->media]);
1208
1209                 seq_printf(seq,"local filter:\n");
1210                 seq_printf(seq,"remote filter: ");
1211                 irlan_print_filter(seq, self->client.filter_type);
1212                 seq_printf(seq,"tx busy: %s\n",
1213                                netif_queue_stopped(self->dev) ? "TRUE" : "FALSE");
1214
1215                 seq_putc(seq,'\n');
1216         }
1217         return 0;
1218 }
1219
1220 static struct seq_operations irlan_seq_ops = {
1221         .start = irlan_seq_start,
1222         .next  = irlan_seq_next,
1223         .stop  = irlan_seq_stop,
1224         .show  = irlan_seq_show,
1225 };
1226
1227 static int irlan_seq_open(struct inode *inode, struct file *file)
1228 {
1229         return seq_open(file, &irlan_seq_ops);
1230 }
1231 #endif
1232
1233 MODULE_AUTHOR("Dag Brattli <dagb@cs.uit.no>");
1234 MODULE_DESCRIPTION("The Linux IrDA LAN protocol");
1235 MODULE_LICENSE("GPL");
1236
1237 module_param(eth, bool, 0);
1238 MODULE_PARM_DESC(eth, "Name devices ethX (0) or irlanX (1)");
1239 module_param(access, int, 0);
1240 MODULE_PARM_DESC(access, "Access type DIRECT=1, PEER=2, HOSTED=3");
1241
1242 module_init(irlan_init);
1243 module_exit(irlan_cleanup);
1244