net/irda/ircomm/ircomm_core.c

   1 /*********************************************************************
   2  *
   3  * Filename:      ircomm_core.c
   4  * Version:       1.0
   5  * Description:   IrCOMM service interface
   6  * Status:        Experimental.
   7  * Author:        Dag Brattli <dagb@cs.uit.no>
   8  * Created at:    Sun Jun  6 20:37:34 1999
   9  * Modified at:   Tue Dec 21 13:26:41 1999
  10  * Modified by:   Dag Brattli <dagb@cs.uit.no>
  11  *
  12  *     Copyright (c) 1999 Dag Brattli, All Rights Reserved.
  13  *     Copyright (c) 2000-2003 Jean Tourrilhes <jt@hpl.hp.com>
  14  *
  15  *     This program is free software; you can redistribute it and/or
  16  *     modify it under the terms of the GNU General Public License as
  17  *     published by the Free Software Foundation; either version 2 of
  18  *     the License, or (at your option) any later version.
  19  *
  20  *     This program is distributed in the hope that it will be useful,
  21  *     but WITHOUT ANY WARRANTY; without even the implied warranty of
  22  *     MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
  23  *     GNU General Public License for more details.
  24  *
  25  *     You should have received a copy of the GNU General Public License
  26  *     along with this program; if not, write to the Free Software
  27  *     Foundation, Inc., 59 Temple Place, Suite 330, Boston,
  28  *     MA 02111-1307 USA
  29  *
  30  ********************************************************************/
  31
  32 #include <linux/module.h>
  33 #include <linux/sched.h>
  34 #include <linux/proc_fs.h>
  35 #include <linux/seq_file.h>
  36 #include <linux/init.h>
  37
  38 #include <net/irda/irda.h>
  39 #include <net/irda/irmod.h>
  40 #include <net/irda/irlmp.h>
  41 #include <net/irda/iriap.h>
  42 #include <net/irda/irttp.h>
  43 #include <net/irda/irias_object.h>
  44
  45 #include <net/irda/ircomm_event.h>
  46 #include <net/irda/ircomm_lmp.h>
  47 #include <net/irda/ircomm_ttp.h>
  48 #include <net/irda/ircomm_param.h>
  49 #include <net/irda/ircomm_core.h>
  50
  51 static int __ircomm_close(struct ircomm_cb *self);
  52 static void ircomm_control_indication(struct ircomm_cb *self,
  53                                       struct sk_buff *skb, int clen);
  54
  55 #ifdef CONFIG_PROC_FS
  56 extern struct proc_dir_entry *proc_irda;
  57 static int ircomm_seq_open(struct inode *, struct file *);
  58
  59 static const struct file_operations ircomm_proc_fops = {
  60         .owner          = THIS_MODULE,
  61         .open           = ircomm_seq_open,
  62         .read           = seq_read,
  63         .llseek         = seq_lseek,
  64         .release        = seq_release,
  65 };
  66 #endif /* CONFIG_PROC_FS */
  67
  68 hashbin_t *ircomm = NULL;
  69
  70 static int __init ircomm_init(void)
  71 {
  72         ircomm = hashbin_new(HB_LOCK);
  73         if (ircomm == NULL) {
  74                 IRDA_ERROR("%s(), can't allocate hashbin!\n", __FUNCTION__);
  75                 return -ENOMEM;
  76         }
  77
  78 #ifdef CONFIG_PROC_FS
  79         { struct proc_dir_entry *ent;
  80         ent = create_proc_entry("ircomm", 0, proc_irda);
  81         if (ent)
  82                 ent->proc_fops = &ircomm_proc_fops;
  83         }
  84 #endif /* CONFIG_PROC_FS */
  85
  86         IRDA_MESSAGE("IrCOMM protocol (Dag Brattli)\n");
  87
  88         return 0;
  89 }
  90
  91 static void __exit ircomm_cleanup(void)
  92 {
  93         IRDA_DEBUG(2, "%s()\n", __FUNCTION__ );
  94
  95         hashbin_delete(ircomm, (FREE_FUNC) __ircomm_close);
  96
  97 #ifdef CONFIG_PROC_FS
  98         remove_proc_entry("ircomm", proc_irda);
  99 #endif /* CONFIG_PROC_FS */
 100 }
 101
 102 /*
 103  * Function ircomm_open (client_notify)
 104  *
 105  *    Start a new IrCOMM instance
 106  *
 107  */
 108 struct ircomm_cb *ircomm_open(notify_t *notify, __u8 service_type, int line)
 109 {
 110         struct ircomm_cb *self = NULL;
 111         int ret;
 112
 113         IRDA_DEBUG(2, "%s(), service_type=0x%02x\n", __FUNCTION__ ,
 114                    service_type);
 115
 116         IRDA_ASSERT(ircomm != NULL, return NULL;);
 117
 118         self = kzalloc(sizeof(struct ircomm_cb), GFP_ATOMIC);
 119         if (self == NULL)
 120                 return NULL;
 121
 122         self->notify = *notify;
 123         self->magic = IRCOMM_MAGIC;
 124
 125         /* Check if we should use IrLMP or IrTTP */
 126         if (service_type & IRCOMM_3_WIRE_RAW) {
 127                 self->flow_status = FLOW_START;
 128                 ret = ircomm_open_lsap(self);
 129         } else
 130                 ret = ircomm_open_tsap(self);
 131
 132         if (ret < 0) {
 133                 kfree(self);
 134                 return NULL;
 135         }
 136
 137         self->service_type = service_type;
 138         self->line = line;
 139
 140         hashbin_insert(ircomm, (irda_queue_t *) self, line, NULL);
 141
 142         ircomm_next_state(self, IRCOMM_IDLE);
 143
 144         return self;
 145 }
 146
 147 EXPORT_SYMBOL(ircomm_open);
 148
 149 /*
 150  * Function ircomm_close_instance (self)
 151  *
 152  *    Remove IrCOMM instance
 153  *
 154  */
 155 static int __ircomm_close(struct ircomm_cb *self)
 156 {
 157         IRDA_DEBUG(2, "%s()\n", __FUNCTION__ );
 158
 159         /* Disconnect link if any */
 160         ircomm_do_event(self, IRCOMM_DISCONNECT_REQUEST, NULL, NULL);
 161
 162         /* Remove TSAP */
 163         if (self->tsap) {
 164                 irttp_close_tsap(self->tsap);
 165                 self->tsap = NULL;
 166         }
 167
 168         /* Remove LSAP */
 169         if (self->lsap) {
 170                 irlmp_close_lsap(self->lsap);
 171                 self->lsap = NULL;
 172         }
 173         self->magic = 0;
 174
 175         kfree(self);
 176
 177         return 0;
 178 }
 179
 180 /*
 181  * Function ircomm_close (self)
 182  *
 183  *    Closes and removes the specified IrCOMM instance
 184  *
 185  */
 186 int ircomm_close(struct ircomm_cb *self)
 187 {
 188         struct ircomm_cb *entry;
 189
 190         IRDA_ASSERT(self != NULL, return -EIO;);
 191         IRDA_ASSERT(self->magic == IRCOMM_MAGIC, return -EIO;);
 192
 193         IRDA_DEBUG(0, "%s()\n", __FUNCTION__ );
 194
 195         entry = hashbin_remove(ircomm, self->line, NULL);
 196
 197         IRDA_ASSERT(entry == self, return -1;);
 198
 199         return __ircomm_close(self);
 200 }
 201
 202 EXPORT_SYMBOL(ircomm_close);
 203
 204 /*
 205  * Function ircomm_connect_request (self, service_type)
 206  *
 207  *    Impl. of this function is differ from one of the reference. This
 208  *    function does discovery as well as sending connect request
 209  *
 210  */
 211 int ircomm_connect_request(struct ircomm_cb *self, __u8 dlsap_sel,
 212                            __u32 saddr, __u32 daddr, struct sk_buff *skb,
 213                            __u8 service_type)
 214 {
 215         struct ircomm_info info;
 216         int ret;
 217
 218         IRDA_DEBUG(2 , "%s()\n", __FUNCTION__ );
 219
 220         IRDA_ASSERT(self != NULL, return -1;);
 221         IRDA_ASSERT(self->magic == IRCOMM_MAGIC, return -1;);
 222
 223         self->service_type= service_type;
 224
 225         info.dlsap_sel = dlsap_sel;
 226         info.saddr = saddr;
 227         info.daddr = daddr;
 228
 229         ret = ircomm_do_event(self, IRCOMM_CONNECT_REQUEST, skb, &info);
 230
 231         return ret;
 232 }
 233
 234 EXPORT_SYMBOL(ircomm_connect_request);
 235
 236 /*
 237  * Function ircomm_connect_indication (self, qos, skb)
 238  *
 239  *    Notify user layer about the incoming connection
 240  *
 241  */
 242 void ircomm_connect_indication(struct ircomm_cb *self, struct sk_buff *skb,
 243                                struct ircomm_info *info)
 244 {
 245         int clen = 0;
 246
 247         IRDA_DEBUG(2, "%s()\n", __FUNCTION__ );
 248
 249         /* Check if the packet contains data on the control channel */
 250         if (skb->len > 0)
 251                 clen = skb->data[0];
 252
 253         /*
 254          * If there are any data hiding in the control channel, we must
 255          * deliver it first. The side effect is that the control channel
 256          * will be removed from the skb
 257          */
 258         if (self->notify.connect_indication)
 259                 self->notify.connect_indication(self->notify.instance, self,
 260                                                 info->qos, info->max_data_size,
 261                                                 info->max_header_size, skb);
 262         else {
 263                 IRDA_DEBUG(0, "%s(), missing handler\n", __FUNCTION__ );
 264         }
 265 }
 266
 267 /*
 268  * Function ircomm_connect_response (self, userdata, max_sdu_size)
 269  *
 270  *    User accepts connection
 271  *
 272  */
 273 int ircomm_connect_response(struct ircomm_cb *self, struct sk_buff *userdata)
 274 {
 275         int ret;
 276
 277         IRDA_ASSERT(self != NULL, return -1;);
 278         IRDA_ASSERT(self->magic == IRCOMM_MAGIC, return -1;);
 279
 280         IRDA_DEBUG(4, "%s()\n", __FUNCTION__ );
 281
 282         ret = ircomm_do_event(self, IRCOMM_CONNECT_RESPONSE, userdata, NULL);
 283
 284         return ret;
 285 }
 286
 287 EXPORT_SYMBOL(ircomm_connect_response);
 288
 289 /*
 290  * Function connect_confirm (self, skb)
 291  *
 292  *    Notify user layer that the link is now connected
 293  *
 294  */
 295 void ircomm_connect_confirm(struct ircomm_cb *self, struct sk_buff *skb,
 296                             struct ircomm_info *info)
 297 {
 298         IRDA_DEBUG(4, "%s()\n", __FUNCTION__ );
 299
 300         if (self->notify.connect_confirm )
 301                 self->notify.connect_confirm(self->notify.instance,
 302                                              self, info->qos,
 303                                              info->max_data_size,
 304                                              info->max_header_size, skb);
 305         else {
 306                 IRDA_DEBUG(0, "%s(), missing handler\n", __FUNCTION__ );
 307         }
 308 }
 309
 310 /*
 311  * Function ircomm_data_request (self, userdata)
 312  *
 313  *    Send IrCOMM data to peer device
 314  *
 315  */
 316 int ircomm_data_request(struct ircomm_cb *self, struct sk_buff *skb)
 317 {
 318         int ret;
 319
 320         IRDA_DEBUG(4, "%s()\n", __FUNCTION__ );
 321
 322         IRDA_ASSERT(self != NULL, return -EFAULT;);
 323         IRDA_ASSERT(self->magic == IRCOMM_MAGIC, return -EFAULT;);
 324         IRDA_ASSERT(skb != NULL, return -EFAULT;);
 325
 326         ret = ircomm_do_event(self, IRCOMM_DATA_REQUEST, skb, NULL);
 327
 328         return ret;
 329 }
 330
 331 EXPORT_SYMBOL(ircomm_data_request);
 332
 333 /*
 334  * Function ircomm_data_indication (self, skb)
 335  *
 336  *    Data arrived, so deliver it to user
 337  *
 338  */
 339 void ircomm_data_indication(struct ircomm_cb *self, struct sk_buff *skb)
 340 {
 341         IRDA_DEBUG(4, "%s()\n", __FUNCTION__ );
 342
 343         IRDA_ASSERT(skb->len > 0, return;);
 344
 345         if (self->notify.data_indication)
 346                 self->notify.data_indication(self->notify.instance, self, skb);
 347         else {
 348                 IRDA_DEBUG(0, "%s(), missing handler\n", __FUNCTION__ );
 349         }
 350 }
 351
 352 /*
 353  * Function ircomm_process_data (self, skb)
 354  *
 355  *    Data arrived which may contain control channel data
 356  *
 357  */
 358 void ircomm_process_data(struct ircomm_cb *self, struct sk_buff *skb)
 359 {
 360         int clen;
 361
 362         IRDA_ASSERT(skb->len > 0, return;);
 363
 364         clen = skb->data[0];
 365
 366         /*
 367          * If there are any data hiding in the control channel, we must
 368          * deliver it first. The side effect is that the control channel
 369          * will be removed from the skb
 370          */
 371         if (clen > 0)
 372                 ircomm_control_indication(self, skb, clen);
 373
 374         /* Remove control channel from data channel */
 375         skb_pull(skb, clen+1);
 376
 377         if (skb->len)
 378                 ircomm_data_indication(self, skb);
 379         else {
 380                 IRDA_DEBUG(4, "%s(), data was control info only!\n",
 381                            __FUNCTION__ );
 382         }
 383 }
 384
 385 /*
 386  * Function ircomm_control_request (self, params)
 387  *
 388  *    Send control data to peer device
 389  *
 390  */
 391 int ircomm_control_request(struct ircomm_cb *self, struct sk_buff *skb)
 392 {
 393         int ret;
 394
 395         IRDA_DEBUG(2, "%s()\n", __FUNCTION__ );
 396
 397         IRDA_ASSERT(self != NULL, return -EFAULT;);
 398         IRDA_ASSERT(self->magic == IRCOMM_MAGIC, return -EFAULT;);
 399         IRDA_ASSERT(skb != NULL, return -EFAULT;);
 400
 401         ret = ircomm_do_event(self, IRCOMM_CONTROL_REQUEST, skb, NULL);
 402
 403         return ret;
 404 }
 405
 406 EXPORT_SYMBOL(ircomm_control_request);
 407
 408 /*
 409  * Function ircomm_control_indication (self, skb)
 410  *
 411  *    Data has arrived on the control channel
 412  *
 413  */
 414 static void ircomm_control_indication(struct ircomm_cb *self,
 415                                       struct sk_buff *skb, int clen)
 416 {
 417         IRDA_DEBUG(2, "%s()\n", __FUNCTION__ );
 418
 419         /* Use udata for delivering data on the control channel */
 420         if (self->notify.udata_indication) {
 421                 struct sk_buff *ctrl_skb;
 422
 423                 /* We don't own the skb, so clone it */
 424                 ctrl_skb = skb_clone(skb, GFP_ATOMIC);
 425                 if (!ctrl_skb)
 426                         return;
 427
 428                 /* Remove data channel from control channel */
 429                 skb_trim(ctrl_skb, clen+1);
 430
 431                 self->notify.udata_indication(self->notify.instance, self,
 432                                               ctrl_skb);
 433
 434                 /* Drop reference count -
 435                  * see ircomm_tty_control_indication(). */
 436                 dev_kfree_skb(ctrl_skb);
 437         } else {
 438                 IRDA_DEBUG(0, "%s(), missing handler\n", __FUNCTION__ );
 439         }
 440 }
 441
 442 /*
 443  * Function ircomm_disconnect_request (self, userdata, priority)
 444  *
 445  *    User layer wants to disconnect the IrCOMM connection
 446  *
 447  */
 448 int ircomm_disconnect_request(struct ircomm_cb *self, struct sk_buff *userdata)
 449 {
 450         struct ircomm_info info;
 451         int ret;
 452
 453         IRDA_DEBUG(2, "%s()\n", __FUNCTION__ );
 454
 455         IRDA_ASSERT(self != NULL, return -1;);
 456         IRDA_ASSERT(self->magic == IRCOMM_MAGIC, return -1;);
 457
 458         ret = ircomm_do_event(self, IRCOMM_DISCONNECT_REQUEST, userdata,
 459                               &info);
 460         return ret;
 461 }
 462
 463 EXPORT_SYMBOL(ircomm_disconnect_request);
 464
 465 /*
 466  * Function disconnect_indication (self, skb)
 467  *
 468  *    Tell user that the link has been disconnected
 469  *
 470  */
 471 void ircomm_disconnect_indication(struct ircomm_cb *self, struct sk_buff *skb,
 472                                   struct ircomm_info *info)
 473 {
 474         IRDA_DEBUG(2, "%s()\n", __FUNCTION__ );
 475
 476         IRDA_ASSERT(info != NULL, return;);
 477
 478         if (self->notify.disconnect_indication) {
 479                 self->notify.disconnect_indication(self->notify.instance, self,
 480                                                    info->reason, skb);
 481         } else {
 482                 IRDA_DEBUG(0, "%s(), missing handler\n", __FUNCTION__ );
 483         }
 484 }
 485
 486 /*
 487  * Function ircomm_flow_request (self, flow)
 488  *
 489  *
 490  *
 491  */
 492 void ircomm_flow_request(struct ircomm_cb *self, LOCAL_FLOW flow)
 493 {
 494         IRDA_DEBUG(2, "%s()\n", __FUNCTION__ );
 495
 496         IRDA_ASSERT(self != NULL, return;);
 497         IRDA_ASSERT(self->magic == IRCOMM_MAGIC, return;);
 498
 499         if (self->service_type == IRCOMM_3_WIRE_RAW)
 500                 return;
 501
 502         irttp_flow_request(self->tsap, flow);
 503 }
 504
 505 EXPORT_SYMBOL(ircomm_flow_request);
 506
 507 #ifdef CONFIG_PROC_FS
 508 static void *ircomm_seq_start(struct seq_file *seq, loff_t *pos)
 509 {
 510         struct ircomm_cb *self;
 511         loff_t off = 0;
 512
 513         spin_lock_irq(&ircomm->hb_spinlock);
 514
 515         for (self = (struct ircomm_cb *) hashbin_get_first(ircomm);
 516              self != NULL;
 517              self = (struct ircomm_cb *) hashbin_get_next(ircomm)) {
 518                 if (off++ == *pos)
 519                         break;
 520
 521         }
 522         return self;
 523 }
 524
 525 static void *ircomm_seq_next(struct seq_file *seq, void *v, loff_t *pos)
 526 {
 527         ++*pos;
 528
 529         return (void *) hashbin_get_next(ircomm);
 530 }
 531
 532 static void ircomm_seq_stop(struct seq_file *seq, void *v)
 533 {
 534         spin_unlock_irq(&ircomm->hb_spinlock);
 535 }
 536
 537 static int ircomm_seq_show(struct seq_file *seq, void *v)
 538 {
 539         const struct ircomm_cb *self = v;
 540
 541         IRDA_ASSERT(self->magic == IRCOMM_MAGIC, return -EINVAL; );
 542
 543         if(self->line < 0x10)
 544                 seq_printf(seq, "ircomm%d", self->line);
 545         else
 546                 seq_printf(seq, "irlpt%d", self->line - 0x10);
 547
 548         seq_printf(seq,
 549                    " state: %s, slsap_sel: %#02x, dlsap_sel: %#02x, mode:",
 550                    ircomm_state[ self->state],
 551                    self->slsap_sel, self->dlsap_sel);
 552
 553         if(self->service_type & IRCOMM_3_WIRE_RAW)
 554                 seq_printf(seq, " 3-wire-raw");
 555         if(self->service_type & IRCOMM_3_WIRE)
 556                 seq_printf(seq, " 3-wire");
 557         if(self->service_type & IRCOMM_9_WIRE)
 558                 seq_printf(seq, " 9-wire");
 559         if(self->service_type & IRCOMM_CENTRONICS)
 560                 seq_printf(seq, " Centronics");
 561         seq_putc(seq, '\n');
 562
 563         return 0;
 564 }
 565
 566 static struct seq_operations ircomm_seq_ops = {
 567         .start  = ircomm_seq_start,
 568         .next   = ircomm_seq_next,
 569         .stop   = ircomm_seq_stop,
 570         .show   = ircomm_seq_show,
 571 };
 572
 573 static int ircomm_seq_open(struct inode *inode, struct file *file)
 574 {
 575         return seq_open(file, &ircomm_seq_ops);
 576 }
 577 #endif /* CONFIG_PROC_FS */
 578
 579 MODULE_AUTHOR("Dag Brattli <dag@brattli.net>");
 580 MODULE_DESCRIPTION("IrCOMM protocol");
 581 MODULE_LICENSE("GPL");
 582
 583 module_init(ircomm_init);
 584 module_exit(ircomm_cleanup);