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Linux/net/irda/ircomm/ircomm_core.c

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

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