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/proc_fs.h>
  34 #include <linux/seq_file.h>
  35 #include <linux/init.h>
  36
  37 #include <net/irda/irda.h>
  38 #include <net/irda/irmod.h>
  39 #include <net/irda/irlmp.h>
  40 #include <net/irda/iriap.h>
  41 #include <net/irda/irttp.h>
  42 #include <net/irda/irias_object.h>
  43
  44 #include <net/irda/ircomm_event.h>
  45 #include <net/irda/ircomm_lmp.h>
  46 #include <net/irda/ircomm_ttp.h>
  47 #include <net/irda/ircomm_param.h>
  48 #include <net/irda/ircomm_core.h>
  49
  50 static int __ircomm_close(struct ircomm_cb *self);
  51 static void ircomm_control_indication(struct ircomm_cb *self,
  52                                       struct sk_buff *skb, int clen);
  53
  54 #ifdef CONFIG_PROC_FS
  55 extern struct proc_dir_entry *proc_irda;
  56 static int ircomm_seq_open(struct inode *, struct file *);
  57
  58 static const struct file_operations ircomm_proc_fops = {
  59         .owner          = THIS_MODULE,
  60         .open           = ircomm_seq_open,
  61         .read           = seq_read,
  62         .llseek         = seq_lseek,
  63         .release        = seq_release,
  64 };
  65 #endif /* CONFIG_PROC_FS */
  66
  67 hashbin_t *ircomm = NULL;
  68
  69 static int __init ircomm_init(void)
  70 {
  71         ircomm = hashbin_new(HB_LOCK);
  72         if (ircomm == NULL) {
  73                 IRDA_ERROR("%s(), can't allocate hashbin!\n", __func__);
  74                 return -ENOMEM;
  75         }
  76
  77 #ifdef CONFIG_PROC_FS
  78         { struct proc_dir_entry *ent;
  79         ent = proc_create("ircomm", 0, proc_irda, &ircomm_proc_fops);
  80         if (!ent) {
  81                 printk(KERN_ERR "ircomm_init: can't create /proc entry!\n");
  82                 return -ENODEV;
  83         }
  84         }
  85 #endif /* CONFIG_PROC_FS */
  86
  87         IRDA_MESSAGE("IrCOMM protocol (Dag Brattli)\n");
  88
  89         return 0;
  90 }
  91
  92 static void __exit ircomm_cleanup(void)
  93 {
  94         IRDA_DEBUG(2, "%s()\n", __func__ );
  95
  96         hashbin_delete(ircomm, (FREE_FUNC) __ircomm_close);
  97
  98 #ifdef CONFIG_PROC_FS
  99         remove_proc_entry("ircomm", proc_irda);
 100 #endif /* CONFIG_PROC_FS */
 101 }
 102
 103 /*
 104  * Function ircomm_open (client_notify)
 105  *
 106  *    Start a new IrCOMM instance
 107  *
 108  */
 109 struct ircomm_cb *ircomm_open(notify_t *notify, __u8 service_type, int line)
 110 {
 111         struct ircomm_cb *self = NULL;
 112         int ret;
 113
 114         IRDA_DEBUG(2, "%s(), service_type=0x%02x\n", __func__ ,
 115                    service_type);
 116
 117         IRDA_ASSERT(ircomm != NULL, return NULL;);
 118
 119         self = kzalloc(sizeof(struct ircomm_cb), GFP_ATOMIC);
 120         if (self == NULL)
 121                 return NULL;
 122
 123         self->notify = *notify;
 124         self->magic = IRCOMM_MAGIC;
 125
 126         /* Check if we should use IrLMP or IrTTP */
 127         if (service_type & IRCOMM_3_WIRE_RAW) {
 128                 self->flow_status = FLOW_START;
 129                 ret = ircomm_open_lsap(self);
 130         } else
 131                 ret = ircomm_open_tsap(self);
 132
 133         if (ret < 0) {
 134                 kfree(self);
 135                 return NULL;
 136         }
 137
 138         self->service_type = service_type;
 139         self->line = line;
 140
 141         hashbin_insert(ircomm, (irda_queue_t *) self, line, NULL);
 142
 143         ircomm_next_state(self, IRCOMM_IDLE);
 144
 145         return self;
 146 }
 147
 148 EXPORT_SYMBOL(ircomm_open);
 149
 150 /*
 151  * Function ircomm_close_instance (self)
 152  *
 153  *    Remove IrCOMM instance
 154  *
 155  */
 156 static int __ircomm_close(struct ircomm_cb *self)
 157 {
 158         IRDA_DEBUG(2, "%s()\n", __func__ );
 159
 160         /* Disconnect link if any */
 161         ircomm_do_event(self, IRCOMM_DISCONNECT_REQUEST, NULL, NULL);
 162
 163         /* Remove TSAP */
 164         if (self->tsap) {
 165                 irttp_close_tsap(self->tsap);
 166                 self->tsap = NULL;
 167         }
 168
 169         /* Remove LSAP */
 170         if (self->lsap) {
 171                 irlmp_close_lsap(self->lsap);
 172                 self->lsap = NULL;
 173         }
 174         self->magic = 0;
 175
 176         kfree(self);
 177
 178         return 0;
 179 }
 180
 181 /*
 182  * Function ircomm_close (self)
 183  *
 184  *    Closes and removes the specified IrCOMM instance
 185  *
 186  */
 187 int ircomm_close(struct ircomm_cb *self)
 188 {
 189         struct ircomm_cb *entry;
 190
 191         IRDA_ASSERT(self != NULL, return -EIO;);
 192         IRDA_ASSERT(self->magic == IRCOMM_MAGIC, return -EIO;);
 193
 194         IRDA_DEBUG(0, "%s()\n", __func__ );
 195
 196         entry = hashbin_remove(ircomm, self->line, NULL);
 197
 198         IRDA_ASSERT(entry == self, return -1;);
 199
 200         return __ircomm_close(self);
 201 }
 202
 203 EXPORT_SYMBOL(ircomm_close);
 204
 205 /*
 206  * Function ircomm_connect_request (self, service_type)
 207  *
 208  *    Impl. of this function is differ from one of the reference. This
 209  *    function does discovery as well as sending connect request
 210  *
 211  */
 212 int ircomm_connect_request(struct ircomm_cb *self, __u8 dlsap_sel,
 213                            __u32 saddr, __u32 daddr, struct sk_buff *skb,
 214                            __u8 service_type)
 215 {
 216         struct ircomm_info info;
 217         int ret;
 218
 219         IRDA_DEBUG(2 , "%s()\n", __func__ );
 220
 221         IRDA_ASSERT(self != NULL, return -1;);
 222         IRDA_ASSERT(self->magic == IRCOMM_MAGIC, return -1;);
 223
 224         self->service_type= service_type;
 225
 226         info.dlsap_sel = dlsap_sel;
 227         info.saddr = saddr;
 228         info.daddr = daddr;
 229
 230         ret = ircomm_do_event(self, IRCOMM_CONNECT_REQUEST, skb, &info);
 231
 232         return ret;
 233 }
 234
 235 EXPORT_SYMBOL(ircomm_connect_request);
 236
 237 /*
 238  * Function ircomm_connect_indication (self, qos, skb)
 239  *
 240  *    Notify user layer about the incoming connection
 241  *
 242  */
 243 void ircomm_connect_indication(struct ircomm_cb *self, struct sk_buff *skb,
 244                                struct ircomm_info *info)
 245 {
 246         int clen = 0;
 247
 248         IRDA_DEBUG(2, "%s()\n", __func__ );
 249
 250         /* Check if the packet contains data on the control channel */
 251         if (skb->len > 0)
 252                 clen = skb->data[0];
 253
 254         /*
 255          * If there are any data hiding in the control channel, we must
 256          * deliver it first. The side effect is that the control channel
 257          * will be removed from the skb
 258          */
 259         if (self->notify.connect_indication)
 260                 self->notify.connect_indication(self->notify.instance, self,
 261                                                 info->qos, info->max_data_size,
 262                                                 info->max_header_size, skb);
 263         else {
 264                 IRDA_DEBUG(0, "%s(), missing handler\n", __func__ );
 265         }
 266 }
 267
 268 /*
 269  * Function ircomm_connect_response (self, userdata, max_sdu_size)
 270  *
 271  *    User accepts connection
 272  *
 273  */
 274 int ircomm_connect_response(struct ircomm_cb *self, struct sk_buff *userdata)
 275 {
 276         int ret;
 277
 278         IRDA_ASSERT(self != NULL, return -1;);
 279         IRDA_ASSERT(self->magic == IRCOMM_MAGIC, return -1;);
 280
 281         IRDA_DEBUG(4, "%s()\n", __func__ );
 282
 283         ret = ircomm_do_event(self, IRCOMM_CONNECT_RESPONSE, userdata, NULL);
 284
 285         return ret;
 286 }
 287
 288 EXPORT_SYMBOL(ircomm_connect_response);
 289
 290 /*
 291  * Function connect_confirm (self, skb)
 292  *
 293  *    Notify user layer that the link is now connected
 294  *
 295  */
 296 void ircomm_connect_confirm(struct ircomm_cb *self, struct sk_buff *skb,
 297                             struct ircomm_info *info)
 298 {
 299         IRDA_DEBUG(4, "%s()\n", __func__ );
 300
 301         if (self->notify.connect_confirm )
 302                 self->notify.connect_confirm(self->notify.instance,
 303                                              self, info->qos,
 304                                              info->max_data_size,
 305                                              info->max_header_size, skb);
 306         else {
 307                 IRDA_DEBUG(0, "%s(), missing handler\n", __func__ );
 308         }
 309 }
 310
 311 /*
 312  * Function ircomm_data_request (self, userdata)
 313  *
 314  *    Send IrCOMM data to peer device
 315  *
 316  */
 317 int ircomm_data_request(struct ircomm_cb *self, struct sk_buff *skb)
 318 {
 319         int ret;
 320
 321         IRDA_DEBUG(4, "%s()\n", __func__ );
 322
 323         IRDA_ASSERT(self != NULL, return -EFAULT;);
 324         IRDA_ASSERT(self->magic == IRCOMM_MAGIC, return -EFAULT;);
 325         IRDA_ASSERT(skb != NULL, return -EFAULT;);
 326
 327         ret = ircomm_do_event(self, IRCOMM_DATA_REQUEST, skb, NULL);
 328
 329         return ret;
 330 }
 331
 332 EXPORT_SYMBOL(ircomm_data_request);
 333
 334 /*
 335  * Function ircomm_data_indication (self, skb)
 336  *
 337  *    Data arrived, so deliver it to user
 338  *
 339  */
 340 void ircomm_data_indication(struct ircomm_cb *self, struct sk_buff *skb)
 341 {
 342         IRDA_DEBUG(4, "%s()\n", __func__ );
 343
 344         IRDA_ASSERT(skb->len > 0, return;);
 345
 346         if (self->notify.data_indication)
 347                 self->notify.data_indication(self->notify.instance, self, skb);
 348         else {
 349                 IRDA_DEBUG(0, "%s(), missing handler\n", __func__ );
 350         }
 351 }
 352
 353 /*
 354  * Function ircomm_process_data (self, skb)
 355  *
 356  *    Data arrived which may contain control channel data
 357  *
 358  */
 359 void ircomm_process_data(struct ircomm_cb *self, struct sk_buff *skb)
 360 {
 361         int clen;
 362
 363         IRDA_ASSERT(skb->len > 0, return;);
 364
 365         clen = skb->data[0];
 366
 367         /*
 368          * Input validation check: a stir4200/mcp2150 combinations sometimes
 369          * results in frames with clen > remaining packet size. These are
 370          * illegal; if we throw away just this frame then it seems to carry on
 371          * fine
 372          */
 373         if (unlikely(skb->len < (clen + 1))) {
 374                 IRDA_DEBUG(2, "%s() throwing away illegal frame\n",
 375                            __func__ );
 376                 return;
 377         }
 378
 379         /*
 380          * If there are any data hiding in the control channel, we must
 381          * deliver it first. The side effect is that the control channel
 382          * will be removed from the skb
 383          */
 384         if (clen > 0)
 385                 ircomm_control_indication(self, skb, clen);
 386
 387         /* Remove control channel from data channel */
 388         skb_pull(skb, clen+1);
 389
 390         if (skb->len)
 391                 ircomm_data_indication(self, skb);
 392         else {
 393                 IRDA_DEBUG(4, "%s(), data was control info only!\n",
 394                            __func__ );
 395         }
 396 }
 397
 398 /*
 399  * Function ircomm_control_request (self, params)
 400  *
 401  *    Send control data to peer device
 402  *
 403  */
 404 int ircomm_control_request(struct ircomm_cb *self, struct sk_buff *skb)
 405 {
 406         int ret;
 407
 408         IRDA_DEBUG(2, "%s()\n", __func__ );
 409
 410         IRDA_ASSERT(self != NULL, return -EFAULT;);
 411         IRDA_ASSERT(self->magic == IRCOMM_MAGIC, return -EFAULT;);
 412         IRDA_ASSERT(skb != NULL, return -EFAULT;);
 413
 414         ret = ircomm_do_event(self, IRCOMM_CONTROL_REQUEST, skb, NULL);
 415
 416         return ret;
 417 }
 418
 419 EXPORT_SYMBOL(ircomm_control_request);
 420
 421 /*
 422  * Function ircomm_control_indication (self, skb)
 423  *
 424  *    Data has arrived on the control channel
 425  *
 426  */
 427 static void ircomm_control_indication(struct ircomm_cb *self,
 428                                       struct sk_buff *skb, int clen)
 429 {
 430         IRDA_DEBUG(2, "%s()\n", __func__ );
 431
 432         /* Use udata for delivering data on the control channel */
 433         if (self->notify.udata_indication) {
 434                 struct sk_buff *ctrl_skb;
 435
 436                 /* We don't own the skb, so clone it */
 437                 ctrl_skb = skb_clone(skb, GFP_ATOMIC);
 438                 if (!ctrl_skb)
 439                         return;
 440
 441                 /* Remove data channel from control channel */
 442                 skb_trim(ctrl_skb, clen+1);
 443
 444                 self->notify.udata_indication(self->notify.instance, self,
 445                                               ctrl_skb);
 446
 447                 /* Drop reference count -
 448                  * see ircomm_tty_control_indication(). */
 449                 dev_kfree_skb(ctrl_skb);
 450         } else {
 451                 IRDA_DEBUG(0, "%s(), missing handler\n", __func__ );
 452         }
 453 }
 454
 455 /*
 456  * Function ircomm_disconnect_request (self, userdata, priority)
 457  *
 458  *    User layer wants to disconnect the IrCOMM connection
 459  *
 460  */
 461 int ircomm_disconnect_request(struct ircomm_cb *self, struct sk_buff *userdata)
 462 {
 463         struct ircomm_info info;
 464         int ret;
 465
 466         IRDA_DEBUG(2, "%s()\n", __func__ );
 467
 468         IRDA_ASSERT(self != NULL, return -1;);
 469         IRDA_ASSERT(self->magic == IRCOMM_MAGIC, return -1;);
 470
 471         ret = ircomm_do_event(self, IRCOMM_DISCONNECT_REQUEST, userdata,
 472                               &info);
 473         return ret;
 474 }
 475
 476 EXPORT_SYMBOL(ircomm_disconnect_request);
 477
 478 /*
 479  * Function disconnect_indication (self, skb)
 480  *
 481  *    Tell user that the link has been disconnected
 482  *
 483  */
 484 void ircomm_disconnect_indication(struct ircomm_cb *self, struct sk_buff *skb,
 485                                   struct ircomm_info *info)
 486 {
 487         IRDA_DEBUG(2, "%s()\n", __func__ );
 488
 489         IRDA_ASSERT(info != NULL, return;);
 490
 491         if (self->notify.disconnect_indication) {
 492                 self->notify.disconnect_indication(self->notify.instance, self,
 493                                                    info->reason, skb);
 494         } else {
 495                 IRDA_DEBUG(0, "%s(), missing handler\n", __func__ );
 496         }
 497 }
 498
 499 /*
 500  * Function ircomm_flow_request (self, flow)
 501  *
 502  *
 503  *
 504  */
 505 void ircomm_flow_request(struct ircomm_cb *self, LOCAL_FLOW flow)
 506 {
 507         IRDA_DEBUG(2, "%s()\n", __func__ );
 508
 509         IRDA_ASSERT(self != NULL, return;);
 510         IRDA_ASSERT(self->magic == IRCOMM_MAGIC, return;);
 511
 512         if (self->service_type == IRCOMM_3_WIRE_RAW)
 513                 return;
 514
 515         irttp_flow_request(self->tsap, flow);
 516 }
 517
 518 EXPORT_SYMBOL(ircomm_flow_request);
 519
 520 #ifdef CONFIG_PROC_FS
 521 static void *ircomm_seq_start(struct seq_file *seq, loff_t *pos)
 522 {
 523         struct ircomm_cb *self;
 524         loff_t off = 0;
 525
 526         spin_lock_irq(&ircomm->hb_spinlock);
 527
 528         for (self = (struct ircomm_cb *) hashbin_get_first(ircomm);
 529              self != NULL;
 530              self = (struct ircomm_cb *) hashbin_get_next(ircomm)) {
 531                 if (off++ == *pos)
 532                         break;
 533
 534         }
 535         return self;
 536 }
 537
 538 static void *ircomm_seq_next(struct seq_file *seq, void *v, loff_t *pos)
 539 {
 540         ++*pos;
 541
 542         return (void *) hashbin_get_next(ircomm);
 543 }
 544
 545 static void ircomm_seq_stop(struct seq_file *seq, void *v)
 546 {
 547         spin_unlock_irq(&ircomm->hb_spinlock);
 548 }
 549
 550 static int ircomm_seq_show(struct seq_file *seq, void *v)
 551 {
 552         const struct ircomm_cb *self = v;
 553
 554         IRDA_ASSERT(self->magic == IRCOMM_MAGIC, return -EINVAL; );
 555
 556         if(self->line < 0x10)
 557                 seq_printf(seq, "ircomm%d", self->line);
 558         else
 559                 seq_printf(seq, "irlpt%d", self->line - 0x10);
 560
 561         seq_printf(seq,
 562                    " state: %s, slsap_sel: %#02x, dlsap_sel: %#02x, mode:",
 563                    ircomm_state[ self->state],
 564                    self->slsap_sel, self->dlsap_sel);
 565
 566         if(self->service_type & IRCOMM_3_WIRE_RAW)
 567                 seq_printf(seq, " 3-wire-raw");
 568         if(self->service_type & IRCOMM_3_WIRE)
 569                 seq_printf(seq, " 3-wire");
 570         if(self->service_type & IRCOMM_9_WIRE)
 571                 seq_printf(seq, " 9-wire");
 572         if(self->service_type & IRCOMM_CENTRONICS)
 573                 seq_printf(seq, " Centronics");
 574         seq_putc(seq, '\n');
 575
 576         return 0;
 577 }
 578
 579 static const struct seq_operations ircomm_seq_ops = {
 580         .start  = ircomm_seq_start,
 581         .next   = ircomm_seq_next,
 582         .stop   = ircomm_seq_stop,
 583         .show   = ircomm_seq_show,
 584 };
 585
 586 static int ircomm_seq_open(struct inode *inode, struct file *file)
 587 {
 588         return seq_open(file, &ircomm_seq_ops);
 589 }
 590 #endif /* CONFIG_PROC_FS */
 591
 592 MODULE_AUTHOR("Dag Brattli <dag@brattli.net>");
 593 MODULE_DESCRIPTION("IrCOMM protocol");
 594 MODULE_LICENSE("GPL");
 595
 596 module_init(ircomm_init);
 597 module_exit(ircomm_cleanup);