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Linux/net/irda/iriap.c

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  1 /*********************************************************************
  2  *
  3  * Filename:      iriap.c
  4  * Version:       0.8
  5  * Description:   Information Access Protocol (IAP)
  6  * Status:        Experimental.
  7  * Author:        Dag Brattli <dagb@cs.uit.no>
  8  * Created at:    Thu Aug 21 00:02:07 1997
  9  * Modified at:   Sat Dec 25 16:42:42 1999
 10  * Modified by:   Dag Brattli <dagb@cs.uit.no>
 11  *
 12  *     Copyright (c) 1998-1999 Dag Brattli <dagb@cs.uit.no>,
 13  *     All Rights Reserved.
 14  *     Copyright (c) 2000-2003 Jean Tourrilhes <jt@hpl.hp.com>
 15  *
 16  *     This program is free software; you can redistribute it and/or
 17  *     modify it under the terms of the GNU General Public License as
 18  *     published by the Free Software Foundation; either version 2 of
 19  *     the License, or (at your option) any later version.
 20  *
 21  *     Neither Dag Brattli nor University of Tromsø admit liability nor
 22  *     provide warranty for any of this software. This material is
 23  *     provided "AS-IS" and at no charge.
 24  *
 25  ********************************************************************/
 26 
 27 #include <linux/module.h>
 28 #include <linux/types.h>
 29 #include <linux/skbuff.h>
 30 #include <linux/fs.h>
 31 #include <linux/string.h>
 32 #include <linux/init.h>
 33 #include <linux/seq_file.h>
 34 #include <linux/slab.h>
 35 
 36 #include <asm/byteorder.h>
 37 #include <asm/unaligned.h>
 38 
 39 #include <net/irda/irda.h>
 40 #include <net/irda/irttp.h>
 41 #include <net/irda/irlmp.h>
 42 #include <net/irda/irias_object.h>
 43 #include <net/irda/iriap_event.h>
 44 #include <net/irda/iriap.h>
 45 
 46 /* FIXME: This one should go in irlmp.c */
 47 static const char *const ias_charset_types[] __maybe_unused = {
 48         "CS_ASCII",
 49         "CS_ISO_8859_1",
 50         "CS_ISO_8859_2",
 51         "CS_ISO_8859_3",
 52         "CS_ISO_8859_4",
 53         "CS_ISO_8859_5",
 54         "CS_ISO_8859_6",
 55         "CS_ISO_8859_7",
 56         "CS_ISO_8859_8",
 57         "CS_ISO_8859_9",
 58         "CS_UNICODE"
 59 };
 60 
 61 static hashbin_t *iriap = NULL;
 62 static void *service_handle;
 63 
 64 static void __iriap_close(struct iriap_cb *self);
 65 static int iriap_register_lsap(struct iriap_cb *self, __u8 slsap_sel, int mode);
 66 static void iriap_disconnect_indication(void *instance, void *sap,
 67                                         LM_REASON reason, struct sk_buff *skb);
 68 static void iriap_connect_indication(void *instance, void *sap,
 69                                      struct qos_info *qos, __u32 max_sdu_size,
 70                                      __u8 max_header_size,
 71                                      struct sk_buff *skb);
 72 static void iriap_connect_confirm(void *instance, void *sap,
 73                                   struct qos_info *qos,
 74                                   __u32 max_sdu_size, __u8 max_header_size,
 75                                   struct sk_buff *skb);
 76 static int iriap_data_indication(void *instance, void *sap,
 77                                  struct sk_buff *skb);
 78 
 79 static void iriap_watchdog_timer_expired(void *data);
 80 
 81 static inline void iriap_start_watchdog_timer(struct iriap_cb *self,
 82                                               int timeout)
 83 {
 84         irda_start_timer(&self->watchdog_timer, timeout, self,
 85                          iriap_watchdog_timer_expired);
 86 }
 87 
 88 static struct lock_class_key irias_objects_key;
 89 
 90 /*
 91  * Function iriap_init (void)
 92  *
 93  *    Initializes the IrIAP layer, called by the module initialization code
 94  *    in irmod.c
 95  */
 96 int __init iriap_init(void)
 97 {
 98         struct ias_object *obj;
 99         struct iriap_cb *server;
100         __u8 oct_seq[6];
101         __u16 hints;
102 
103         /* Allocate master array */
104         iriap = hashbin_new(HB_LOCK);
105         if (!iriap)
106                 return -ENOMEM;
107 
108         /* Object repository - defined in irias_object.c */
109         irias_objects = hashbin_new(HB_LOCK);
110         if (!irias_objects) {
111                 net_warn_ratelimited("%s: Can't allocate irias_objects hashbin!\n",
112                                      __func__);
113                 hashbin_delete(iriap, NULL);
114                 return -ENOMEM;
115         }
116 
117         lockdep_set_class_and_name(&irias_objects->hb_spinlock, &irias_objects_key,
118                                    "irias_objects");
119 
120         /*
121          *  Register some default services for IrLMP
122          */
123         hints  = irlmp_service_to_hint(S_COMPUTER);
124         service_handle = irlmp_register_service(hints);
125 
126         /* Register the Device object with LM-IAS */
127         obj = irias_new_object("Device", IAS_DEVICE_ID);
128         irias_add_string_attrib(obj, "DeviceName", "Linux", IAS_KERNEL_ATTR);
129 
130         oct_seq[0] = 0x01;  /* Version 1 */
131         oct_seq[1] = 0x00;  /* IAS support bits */
132         oct_seq[2] = 0x00;  /* LM-MUX support bits */
133 #ifdef CONFIG_IRDA_ULTRA
134         oct_seq[2] |= 0x04; /* Connectionless Data support */
135 #endif
136         irias_add_octseq_attrib(obj, "IrLMPSupport", oct_seq, 3,
137                                 IAS_KERNEL_ATTR);
138         irias_insert_object(obj);
139 
140         /*
141          *  Register server support with IrLMP so we can accept incoming
142          *  connections
143          */
144         server = iriap_open(LSAP_IAS, IAS_SERVER, NULL, NULL);
145         if (!server) {
146                 pr_debug("%s(), unable to open server\n", __func__);
147                 return -1;
148         }
149         iriap_register_lsap(server, LSAP_IAS, IAS_SERVER);
150 
151         return 0;
152 }
153 
154 /*
155  * Function iriap_cleanup (void)
156  *
157  *    Initializes the IrIAP layer, called by the module cleanup code in
158  *    irmod.c
159  */
160 void iriap_cleanup(void)
161 {
162         irlmp_unregister_service(service_handle);
163 
164         hashbin_delete(iriap, (FREE_FUNC) __iriap_close);
165         hashbin_delete(irias_objects, (FREE_FUNC) __irias_delete_object);
166 }
167 
168 /*
169  * Function iriap_open (void)
170  *
171  *    Opens an instance of the IrIAP layer, and registers with IrLMP
172  */
173 struct iriap_cb *iriap_open(__u8 slsap_sel, int mode, void *priv,
174                             CONFIRM_CALLBACK callback)
175 {
176         struct iriap_cb *self;
177 
178         self = kzalloc(sizeof(*self), GFP_ATOMIC);
179         if (!self)
180                 return NULL;
181 
182         /*
183          *  Initialize instance
184          */
185 
186         self->magic = IAS_MAGIC;
187         self->mode = mode;
188         if (mode == IAS_CLIENT) {
189                 if (iriap_register_lsap(self, slsap_sel, mode)) {
190                         kfree(self);
191                         return NULL;
192                 }
193         }
194 
195         self->confirm = callback;
196         self->priv = priv;
197 
198         /* iriap_getvaluebyclass_request() will construct packets before
199          * we connect, so this must have a sane value... Jean II */
200         self->max_header_size = LMP_MAX_HEADER;
201 
202         init_timer(&self->watchdog_timer);
203 
204         hashbin_insert(iriap, (irda_queue_t *) self, (long) self, NULL);
205 
206         /* Initialize state machines */
207         iriap_next_client_state(self, S_DISCONNECT);
208         iriap_next_call_state(self, S_MAKE_CALL);
209         iriap_next_server_state(self, R_DISCONNECT);
210         iriap_next_r_connect_state(self, R_WAITING);
211 
212         return self;
213 }
214 EXPORT_SYMBOL(iriap_open);
215 
216 /*
217  * Function __iriap_close (self)
218  *
219  *    Removes (deallocates) the IrIAP instance
220  *
221  */
222 static void __iriap_close(struct iriap_cb *self)
223 {
224         IRDA_ASSERT(self != NULL, return;);
225         IRDA_ASSERT(self->magic == IAS_MAGIC, return;);
226 
227         del_timer(&self->watchdog_timer);
228 
229         if (self->request_skb)
230                 dev_kfree_skb(self->request_skb);
231 
232         self->magic = 0;
233 
234         kfree(self);
235 }
236 
237 /*
238  * Function iriap_close (void)
239  *
240  *    Closes IrIAP and deregisters with IrLMP
241  */
242 void iriap_close(struct iriap_cb *self)
243 {
244         struct iriap_cb *entry;
245 
246         IRDA_ASSERT(self != NULL, return;);
247         IRDA_ASSERT(self->magic == IAS_MAGIC, return;);
248 
249         if (self->lsap) {
250                 irlmp_close_lsap(self->lsap);
251                 self->lsap = NULL;
252         }
253 
254         entry = (struct iriap_cb *) hashbin_remove(iriap, (long) self, NULL);
255         IRDA_ASSERT(entry == self, return;);
256 
257         __iriap_close(self);
258 }
259 EXPORT_SYMBOL(iriap_close);
260 
261 static int iriap_register_lsap(struct iriap_cb *self, __u8 slsap_sel, int mode)
262 {
263         notify_t notify;
264 
265         irda_notify_init(&notify);
266         notify.connect_confirm       = iriap_connect_confirm;
267         notify.connect_indication    = iriap_connect_indication;
268         notify.disconnect_indication = iriap_disconnect_indication;
269         notify.data_indication       = iriap_data_indication;
270         notify.instance = self;
271         if (mode == IAS_CLIENT)
272                 strcpy(notify.name, "IrIAS cli");
273         else
274                 strcpy(notify.name, "IrIAS srv");
275 
276         self->lsap = irlmp_open_lsap(slsap_sel, &notify, 0);
277         if (self->lsap == NULL) {
278                 net_err_ratelimited("%s: Unable to allocated LSAP!\n",
279                                     __func__);
280                 return -1;
281         }
282         self->slsap_sel = self->lsap->slsap_sel;
283 
284         return 0;
285 }
286 
287 /*
288  * Function iriap_disconnect_indication (handle, reason)
289  *
290  *    Got disconnect, so clean up everything associated with this connection
291  *
292  */
293 static void iriap_disconnect_indication(void *instance, void *sap,
294                                         LM_REASON reason,
295                                         struct sk_buff *skb)
296 {
297         struct iriap_cb *self;
298 
299         pr_debug("%s(), reason=%s [%d]\n", __func__,
300                  irlmp_reason_str(reason), reason);
301 
302         self = instance;
303 
304         IRDA_ASSERT(self != NULL, return;);
305         IRDA_ASSERT(self->magic == IAS_MAGIC, return;);
306 
307         IRDA_ASSERT(iriap != NULL, return;);
308 
309         del_timer(&self->watchdog_timer);
310 
311         /* Not needed */
312         if (skb)
313                 dev_kfree_skb(skb);
314 
315         if (self->mode == IAS_CLIENT) {
316                 pr_debug("%s(), disconnect as client\n", __func__);
317 
318 
319                 iriap_do_client_event(self, IAP_LM_DISCONNECT_INDICATION,
320                                       NULL);
321                 /*
322                  * Inform service user that the request failed by sending
323                  * it a NULL value. Warning, the client might close us, so
324                  * remember no to use self anymore after calling confirm
325                  */
326                 if (self->confirm)
327                         self->confirm(IAS_DISCONNECT, 0, NULL, self->priv);
328         } else {
329                 pr_debug("%s(), disconnect as server\n", __func__);
330                 iriap_do_server_event(self, IAP_LM_DISCONNECT_INDICATION,
331                                       NULL);
332                 iriap_close(self);
333         }
334 }
335 
336 /*
337  * Function iriap_disconnect_request (handle)
338  */
339 static void iriap_disconnect_request(struct iriap_cb *self)
340 {
341         struct sk_buff *tx_skb;
342 
343         IRDA_ASSERT(self != NULL, return;);
344         IRDA_ASSERT(self->magic == IAS_MAGIC, return;);
345 
346         tx_skb = alloc_skb(LMP_MAX_HEADER, GFP_ATOMIC);
347         if (tx_skb == NULL) {
348                 pr_debug("%s(), Could not allocate an sk_buff of length %d\n",
349                          __func__, LMP_MAX_HEADER);
350                 return;
351         }
352 
353         /*
354          *  Reserve space for MUX control and LAP header
355          */
356         skb_reserve(tx_skb, LMP_MAX_HEADER);
357 
358         irlmp_disconnect_request(self->lsap, tx_skb);
359 }
360 
361 /*
362  * Function iriap_getvaluebyclass (addr, name, attr)
363  *
364  *    Retrieve all values from attribute in all objects with given class
365  *    name
366  */
367 int iriap_getvaluebyclass_request(struct iriap_cb *self,
368                                   __u32 saddr, __u32 daddr,
369                                   char *name, char *attr)
370 {
371         struct sk_buff *tx_skb;
372         int name_len, attr_len, skb_len;
373         __u8 *frame;
374 
375         IRDA_ASSERT(self != NULL, return -1;);
376         IRDA_ASSERT(self->magic == IAS_MAGIC, return -1;);
377 
378         /* Client must supply the destination device address */
379         if (!daddr)
380                 return -1;
381 
382         self->daddr = daddr;
383         self->saddr = saddr;
384 
385         /*
386          *  Save operation, so we know what the later indication is about
387          */
388         self->operation = GET_VALUE_BY_CLASS;
389 
390         /* Give ourselves 10 secs to finish this operation */
391         iriap_start_watchdog_timer(self, 10*HZ);
392 
393         name_len = strlen(name);        /* Up to IAS_MAX_CLASSNAME = 60 */
394         attr_len = strlen(attr);        /* Up to IAS_MAX_ATTRIBNAME = 60 */
395 
396         skb_len = self->max_header_size+2+name_len+1+attr_len+4;
397         tx_skb = alloc_skb(skb_len, GFP_ATOMIC);
398         if (!tx_skb)
399                 return -ENOMEM;
400 
401         /* Reserve space for MUX and LAP header */
402         skb_reserve(tx_skb, self->max_header_size);
403         skb_put(tx_skb, 3+name_len+attr_len);
404         frame = tx_skb->data;
405 
406         /* Build frame */
407         frame[0] = IAP_LST | GET_VALUE_BY_CLASS;
408         frame[1] = name_len;                       /* Insert length of name */
409         memcpy(frame+2, name, name_len);           /* Insert name */
410         frame[2+name_len] = attr_len;              /* Insert length of attr */
411         memcpy(frame+3+name_len, attr, attr_len);  /* Insert attr */
412 
413         iriap_do_client_event(self, IAP_CALL_REQUEST_GVBC, tx_skb);
414 
415         /* Drop reference count - see state_s_disconnect(). */
416         dev_kfree_skb(tx_skb);
417 
418         return 0;
419 }
420 EXPORT_SYMBOL(iriap_getvaluebyclass_request);
421 
422 /*
423  * Function iriap_getvaluebyclass_confirm (self, skb)
424  *
425  *    Got result from GetValueByClass command. Parse it and return result
426  *    to service user.
427  *
428  */
429 static void iriap_getvaluebyclass_confirm(struct iriap_cb *self,
430                                           struct sk_buff *skb)
431 {
432         struct ias_value *value;
433         int charset;
434         __u32 value_len;
435         __u32 tmp_cpu32;
436         __u16 obj_id;
437         __u16 len;
438         __u8  type;
439         __u8 *fp;
440         int n;
441 
442         IRDA_ASSERT(self != NULL, return;);
443         IRDA_ASSERT(self->magic == IAS_MAGIC, return;);
444         IRDA_ASSERT(skb != NULL, return;);
445 
446         /* Initialize variables */
447         fp = skb->data;
448         n = 2;
449 
450         /* Get length, MSB first */
451         len = get_unaligned_be16(fp + n);
452         n += 2;
453 
454         pr_debug("%s(), len=%d\n", __func__, len);
455 
456         /* Get object ID, MSB first */
457         obj_id = get_unaligned_be16(fp + n);
458         n += 2;
459 
460         type = fp[n++];
461         pr_debug("%s(), Value type = %d\n", __func__, type);
462 
463         switch (type) {
464         case IAS_INTEGER:
465                 memcpy(&tmp_cpu32, fp+n, 4); n += 4;
466                 be32_to_cpus(&tmp_cpu32);
467                 value = irias_new_integer_value(tmp_cpu32);
468 
469                 /*  Legal values restricted to 0x01-0x6f, page 15 irttp */
470                 pr_debug("%s(), lsap=%d\n", __func__, value->t.integer);
471                 break;
472         case IAS_STRING:
473                 charset = fp[n++];
474 
475                 switch (charset) {
476                 case CS_ASCII:
477                         break;
478 /*              case CS_ISO_8859_1: */
479 /*              case CS_ISO_8859_2: */
480 /*              case CS_ISO_8859_3: */
481 /*              case CS_ISO_8859_4: */
482 /*              case CS_ISO_8859_5: */
483 /*              case CS_ISO_8859_6: */
484 /*              case CS_ISO_8859_7: */
485 /*              case CS_ISO_8859_8: */
486 /*              case CS_ISO_8859_9: */
487 /*              case CS_UNICODE: */
488                 default:
489                         pr_debug("%s(), charset [%d] %s, not supported\n",
490                                  __func__, charset,
491                                  charset < ARRAY_SIZE(ias_charset_types) ?
492                                  ias_charset_types[charset] :
493                                  "(unknown)");
494 
495                         /* Aborting, close connection! */
496                         iriap_disconnect_request(self);
497                         return;
498                         /* break; */
499                 }
500                 value_len = fp[n++];
501                 pr_debug("%s(), strlen=%d\n", __func__, value_len);
502 
503                 /* Make sure the string is null-terminated */
504                 if (n + value_len < skb->len)
505                         fp[n + value_len] = 0x00;
506                 pr_debug("Got string %s\n", fp+n);
507 
508                 /* Will truncate to IAS_MAX_STRING bytes */
509                 value = irias_new_string_value(fp+n);
510                 break;
511         case IAS_OCT_SEQ:
512                 value_len = get_unaligned_be16(fp + n);
513                 n += 2;
514 
515                 /* Will truncate to IAS_MAX_OCTET_STRING bytes */
516                 value = irias_new_octseq_value(fp+n, value_len);
517                 break;
518         default:
519                 value = irias_new_missing_value();
520                 break;
521         }
522 
523         /* Finished, close connection! */
524         iriap_disconnect_request(self);
525 
526         /* Warning, the client might close us, so remember no to use self
527          * anymore after calling confirm
528          */
529         if (self->confirm)
530                 self->confirm(IAS_SUCCESS, obj_id, value, self->priv);
531         else {
532                 pr_debug("%s(), missing handler!\n", __func__);
533                 irias_delete_value(value);
534         }
535 }
536 
537 /*
538  * Function iriap_getvaluebyclass_response ()
539  *
540  *    Send answer back to remote LM-IAS
541  *
542  */
543 static void iriap_getvaluebyclass_response(struct iriap_cb *self,
544                                            __u16 obj_id,
545                                            __u8 ret_code,
546                                            struct ias_value *value)
547 {
548         struct sk_buff *tx_skb;
549         int n;
550         __be32 tmp_be32;
551         __be16 tmp_be16;
552         __u8 *fp;
553 
554         IRDA_ASSERT(self != NULL, return;);
555         IRDA_ASSERT(self->magic == IAS_MAGIC, return;);
556         IRDA_ASSERT(value != NULL, return;);
557         IRDA_ASSERT(value->len <= 1024, return;);
558 
559         /* Initialize variables */
560         n = 0;
561 
562         /*
563          *  We must adjust the size of the response after the length of the
564          *  value. We add 32 bytes because of the 6 bytes for the frame and
565          *  max 5 bytes for the value coding.
566          */
567         tx_skb = alloc_skb(value->len + self->max_header_size + 32,
568                            GFP_ATOMIC);
569         if (!tx_skb)
570                 return;
571 
572         /* Reserve space for MUX and LAP header */
573         skb_reserve(tx_skb, self->max_header_size);
574         skb_put(tx_skb, 6);
575 
576         fp = tx_skb->data;
577 
578         /* Build frame */
579         fp[n++] = GET_VALUE_BY_CLASS | IAP_LST;
580         fp[n++] = ret_code;
581 
582         /* Insert list length (MSB first) */
583         tmp_be16 = htons(0x0001);
584         memcpy(fp+n, &tmp_be16, 2);  n += 2;
585 
586         /* Insert object identifier ( MSB first) */
587         tmp_be16 = cpu_to_be16(obj_id);
588         memcpy(fp+n, &tmp_be16, 2); n += 2;
589 
590         switch (value->type) {
591         case IAS_STRING:
592                 skb_put(tx_skb, 3 + value->len);
593                 fp[n++] = value->type;
594                 fp[n++] = 0; /* ASCII */
595                 fp[n++] = (__u8) value->len;
596                 memcpy(fp+n, value->t.string, value->len); n+=value->len;
597                 break;
598         case IAS_INTEGER:
599                 skb_put(tx_skb, 5);
600                 fp[n++] = value->type;
601 
602                 tmp_be32 = cpu_to_be32(value->t.integer);
603                 memcpy(fp+n, &tmp_be32, 4); n += 4;
604                 break;
605         case IAS_OCT_SEQ:
606                 skb_put(tx_skb, 3 + value->len);
607                 fp[n++] = value->type;
608 
609                 tmp_be16 = cpu_to_be16(value->len);
610                 memcpy(fp+n, &tmp_be16, 2); n += 2;
611                 memcpy(fp+n, value->t.oct_seq, value->len); n+=value->len;
612                 break;
613         case IAS_MISSING:
614                 pr_debug("%s: sending IAS_MISSING\n", __func__);
615                 skb_put(tx_skb, 1);
616                 fp[n++] = value->type;
617                 break;
618         default:
619                 pr_debug("%s(), type not implemented!\n", __func__);
620                 break;
621         }
622         iriap_do_r_connect_event(self, IAP_CALL_RESPONSE, tx_skb);
623 
624         /* Drop reference count - see state_r_execute(). */
625         dev_kfree_skb(tx_skb);
626 }
627 
628 /*
629  * Function iriap_getvaluebyclass_indication (self, skb)
630  *
631  *    getvaluebyclass is requested from peer LM-IAS
632  *
633  */
634 static void iriap_getvaluebyclass_indication(struct iriap_cb *self,
635                                              struct sk_buff *skb)
636 {
637         struct ias_object *obj;
638         struct ias_attrib *attrib;
639         int name_len;
640         int attr_len;
641         char name[IAS_MAX_CLASSNAME + 1];       /* 60 bytes */
642         char attr[IAS_MAX_ATTRIBNAME + 1];      /* 60 bytes */
643         __u8 *fp;
644         int n;
645 
646         IRDA_ASSERT(self != NULL, return;);
647         IRDA_ASSERT(self->magic == IAS_MAGIC, return;);
648         IRDA_ASSERT(skb != NULL, return;);
649 
650         fp = skb->data;
651         n = 1;
652 
653         name_len = fp[n++];
654 
655         IRDA_ASSERT(name_len < IAS_MAX_CLASSNAME + 1, return;);
656 
657         memcpy(name, fp+n, name_len); n+=name_len;
658         name[name_len] = '\0';
659 
660         attr_len = fp[n++];
661 
662         IRDA_ASSERT(attr_len < IAS_MAX_ATTRIBNAME + 1, return;);
663 
664         memcpy(attr, fp+n, attr_len); n+=attr_len;
665         attr[attr_len] = '\0';
666 
667         pr_debug("LM-IAS: Looking up %s: %s\n", name, attr);
668         obj = irias_find_object(name);
669 
670         if (obj == NULL) {
671                 pr_debug("LM-IAS: Object %s not found\n", name);
672                 iriap_getvaluebyclass_response(self, 0x1235, IAS_CLASS_UNKNOWN,
673                                                &irias_missing);
674                 return;
675         }
676         pr_debug("LM-IAS: found %s, id=%d\n", obj->name, obj->id);
677 
678         attrib = irias_find_attrib(obj, attr);
679         if (attrib == NULL) {
680                 pr_debug("LM-IAS: Attribute %s not found\n", attr);
681                 iriap_getvaluebyclass_response(self, obj->id,
682                                                IAS_ATTRIB_UNKNOWN,
683                                                &irias_missing);
684                 return;
685         }
686 
687         /* We have a match; send the value.  */
688         iriap_getvaluebyclass_response(self, obj->id, IAS_SUCCESS,
689                                        attrib->value);
690 }
691 
692 /*
693  * Function iriap_send_ack (void)
694  *
695  *    Currently not used
696  *
697  */
698 void iriap_send_ack(struct iriap_cb *self)
699 {
700         struct sk_buff *tx_skb;
701         __u8 *frame;
702 
703         IRDA_ASSERT(self != NULL, return;);
704         IRDA_ASSERT(self->magic == IAS_MAGIC, return;);
705 
706         tx_skb = alloc_skb(LMP_MAX_HEADER + 1, GFP_ATOMIC);
707         if (!tx_skb)
708                 return;
709 
710         /* Reserve space for MUX and LAP header */
711         skb_reserve(tx_skb, self->max_header_size);
712         skb_put(tx_skb, 1);
713         frame = tx_skb->data;
714 
715         /* Build frame */
716         frame[0] = IAP_LST | IAP_ACK | self->operation;
717 
718         irlmp_data_request(self->lsap, tx_skb);
719 }
720 
721 void iriap_connect_request(struct iriap_cb *self)
722 {
723         int ret;
724 
725         IRDA_ASSERT(self != NULL, return;);
726         IRDA_ASSERT(self->magic == IAS_MAGIC, return;);
727 
728         ret = irlmp_connect_request(self->lsap, LSAP_IAS,
729                                     self->saddr, self->daddr,
730                                     NULL, NULL);
731         if (ret < 0) {
732                 pr_debug("%s(), connect failed!\n", __func__);
733                 self->confirm(IAS_DISCONNECT, 0, NULL, self->priv);
734         }
735 }
736 
737 /*
738  * Function iriap_connect_confirm (handle, skb)
739  *
740  *    LSAP connection confirmed!
741  *
742  */
743 static void iriap_connect_confirm(void *instance, void *sap,
744                                   struct qos_info *qos, __u32 max_seg_size,
745                                   __u8 max_header_size,
746                                   struct sk_buff *skb)
747 {
748         struct iriap_cb *self;
749 
750         self = instance;
751 
752         IRDA_ASSERT(self != NULL, return;);
753         IRDA_ASSERT(self->magic == IAS_MAGIC, return;);
754         IRDA_ASSERT(skb != NULL, return;);
755 
756         self->max_data_size = max_seg_size;
757         self->max_header_size = max_header_size;
758 
759         del_timer(&self->watchdog_timer);
760 
761         iriap_do_client_event(self, IAP_LM_CONNECT_CONFIRM, skb);
762 
763         /* Drop reference count - see state_s_make_call(). */
764         dev_kfree_skb(skb);
765 }
766 
767 /*
768  * Function iriap_connect_indication ( handle, skb)
769  *
770  *    Remote LM-IAS is requesting connection
771  *
772  */
773 static void iriap_connect_indication(void *instance, void *sap,
774                                      struct qos_info *qos, __u32 max_seg_size,
775                                      __u8 max_header_size,
776                                      struct sk_buff *skb)
777 {
778         struct iriap_cb *self, *new;
779 
780         self = instance;
781 
782         IRDA_ASSERT(skb != NULL, return;);
783         IRDA_ASSERT(self != NULL, goto out;);
784         IRDA_ASSERT(self->magic == IAS_MAGIC, goto out;);
785 
786         /* Start new server */
787         new = iriap_open(LSAP_IAS, IAS_SERVER, NULL, NULL);
788         if (!new) {
789                 pr_debug("%s(), open failed\n", __func__);
790                 goto out;
791         }
792 
793         /* Now attach up the new "socket" */
794         new->lsap = irlmp_dup(self->lsap, new);
795         if (!new->lsap) {
796                 pr_debug("%s(), dup failed!\n", __func__);
797                 goto out;
798         }
799 
800         new->max_data_size = max_seg_size;
801         new->max_header_size = max_header_size;
802 
803         /* Clean up the original one to keep it in listen state */
804         irlmp_listen(self->lsap);
805 
806         iriap_do_server_event(new, IAP_LM_CONNECT_INDICATION, skb);
807 
808 out:
809         /* Drop reference count - see state_r_disconnect(). */
810         dev_kfree_skb(skb);
811 }
812 
813 /*
814  * Function iriap_data_indication (handle, skb)
815  *
816  *    Receives data from connection identified by handle from IrLMP
817  *
818  */
819 static int iriap_data_indication(void *instance, void *sap,
820                                  struct sk_buff *skb)
821 {
822         struct iriap_cb *self;
823         __u8  *frame;
824         __u8  opcode;
825 
826         self = instance;
827 
828         IRDA_ASSERT(skb != NULL, return 0;);
829         IRDA_ASSERT(self != NULL, goto out;);
830         IRDA_ASSERT(self->magic == IAS_MAGIC, goto out;);
831 
832         frame = skb->data;
833 
834         if (self->mode == IAS_SERVER) {
835                 /* Call server */
836                 pr_debug("%s(), Calling server!\n", __func__);
837                 iriap_do_r_connect_event(self, IAP_RECV_F_LST, skb);
838                 goto out;
839         }
840         opcode = frame[0];
841         if (~opcode & IAP_LST) {
842                 net_warn_ratelimited("%s:, IrIAS multiframe commands or results is not implemented yet!\n",
843                                      __func__);
844                 goto out;
845         }
846 
847         /* Check for ack frames since they don't contain any data */
848         if (opcode & IAP_ACK) {
849                 pr_debug("%s() Got ack frame!\n", __func__);
850                 goto out;
851         }
852 
853         opcode &= ~IAP_LST; /* Mask away LST bit */
854 
855         switch (opcode) {
856         case GET_INFO_BASE:
857                 pr_debug("IrLMP GetInfoBaseDetails not implemented!\n");
858                 break;
859         case GET_VALUE_BY_CLASS:
860                 iriap_do_call_event(self, IAP_RECV_F_LST, NULL);
861 
862                 switch (frame[1]) {
863                 case IAS_SUCCESS:
864                         iriap_getvaluebyclass_confirm(self, skb);
865                         break;
866                 case IAS_CLASS_UNKNOWN:
867                         pr_debug("%s(), No such class!\n", __func__);
868                         /* Finished, close connection! */
869                         iriap_disconnect_request(self);
870 
871                         /*
872                          * Warning, the client might close us, so remember
873                          * no to use self anymore after calling confirm
874                          */
875                         if (self->confirm)
876                                 self->confirm(IAS_CLASS_UNKNOWN, 0, NULL,
877                                               self->priv);
878                         break;
879                 case IAS_ATTRIB_UNKNOWN:
880                         pr_debug("%s(), No such attribute!\n", __func__);
881                         /* Finished, close connection! */
882                         iriap_disconnect_request(self);
883 
884                         /*
885                          * Warning, the client might close us, so remember
886                          * no to use self anymore after calling confirm
887                          */
888                         if (self->confirm)
889                                 self->confirm(IAS_ATTRIB_UNKNOWN, 0, NULL,
890                                               self->priv);
891                         break;
892                 }
893                 break;
894         default:
895                 pr_debug("%s(), Unknown op-code: %02x\n", __func__,
896                          opcode);
897                 break;
898         }
899 
900 out:
901         /* Cleanup - sub-calls will have done skb_get() as needed. */
902         dev_kfree_skb(skb);
903         return 0;
904 }
905 
906 /*
907  * Function iriap_call_indication (self, skb)
908  *
909  *    Received call to server from peer LM-IAS
910  *
911  */
912 void iriap_call_indication(struct iriap_cb *self, struct sk_buff *skb)
913 {
914         __u8 *fp;
915         __u8 opcode;
916 
917         IRDA_ASSERT(self != NULL, return;);
918         IRDA_ASSERT(self->magic == IAS_MAGIC, return;);
919         IRDA_ASSERT(skb != NULL, return;);
920 
921         fp = skb->data;
922 
923         opcode = fp[0];
924         if (~opcode & 0x80) {
925                 net_warn_ratelimited("%s: IrIAS multiframe commands or results is not implemented yet!\n",
926                                      __func__);
927                 return;
928         }
929         opcode &= 0x7f; /* Mask away LST bit */
930 
931         switch (opcode) {
932         case GET_INFO_BASE:
933                 net_warn_ratelimited("%s: GetInfoBaseDetails not implemented yet!\n",
934                                      __func__);
935                 break;
936         case GET_VALUE_BY_CLASS:
937                 iriap_getvaluebyclass_indication(self, skb);
938                 break;
939         }
940         /* skb will be cleaned up in iriap_data_indication */
941 }
942 
943 /*
944  * Function iriap_watchdog_timer_expired (data)
945  *
946  *    Query has taken too long time, so abort
947  *
948  */
949 static void iriap_watchdog_timer_expired(void *data)
950 {
951         struct iriap_cb *self = (struct iriap_cb *) data;
952 
953         IRDA_ASSERT(self != NULL, return;);
954         IRDA_ASSERT(self->magic == IAS_MAGIC, return;);
955 
956         /* iriap_close(self); */
957 }
958 
959 #ifdef CONFIG_PROC_FS
960 
961 static const char *const ias_value_types[] = {
962         "IAS_MISSING",
963         "IAS_INTEGER",
964         "IAS_OCT_SEQ",
965         "IAS_STRING"
966 };
967 
968 static inline struct ias_object *irias_seq_idx(loff_t pos)
969 {
970         struct ias_object *obj;
971 
972         for (obj = (struct ias_object *) hashbin_get_first(irias_objects);
973              obj; obj = (struct ias_object *) hashbin_get_next(irias_objects)) {
974                 if (pos-- == 0)
975                         break;
976         }
977 
978         return obj;
979 }
980 
981 static void *irias_seq_start(struct seq_file *seq, loff_t *pos)
982 {
983         spin_lock_irq(&irias_objects->hb_spinlock);
984 
985         return *pos ? irias_seq_idx(*pos - 1) : SEQ_START_TOKEN;
986 }
987 
988 static void *irias_seq_next(struct seq_file *seq, void *v, loff_t *pos)
989 {
990         ++*pos;
991 
992         return (v == SEQ_START_TOKEN)
993                 ? (void *) hashbin_get_first(irias_objects)
994                 : (void *) hashbin_get_next(irias_objects);
995 }
996 
997 static void irias_seq_stop(struct seq_file *seq, void *v)
998 {
999         spin_unlock_irq(&irias_objects->hb_spinlock);
1000 }
1001 
1002 static int irias_seq_show(struct seq_file *seq, void *v)
1003 {
1004         if (v == SEQ_START_TOKEN)
1005                 seq_puts(seq, "LM-IAS Objects:\n");
1006         else {
1007                 struct ias_object *obj = v;
1008                 struct ias_attrib *attrib;
1009 
1010                 IRDA_ASSERT(obj->magic == IAS_OBJECT_MAGIC, return -EINVAL;);
1011 
1012                 seq_printf(seq, "name: %s, id=%d\n",
1013                            obj->name, obj->id);
1014 
1015                 /* Careful for priority inversions here !
1016                  * All other uses of attrib spinlock are independent of
1017                  * the object spinlock, so we are safe. Jean II */
1018                 spin_lock(&obj->attribs->hb_spinlock);
1019 
1020                 /* List all attributes for this object */
1021                 for (attrib = (struct ias_attrib *) hashbin_get_first(obj->attribs);
1022                      attrib != NULL;
1023                      attrib = (struct ias_attrib *) hashbin_get_next(obj->attribs)) {
1024 
1025                         IRDA_ASSERT(attrib->magic == IAS_ATTRIB_MAGIC,
1026                                     goto outloop; );
1027 
1028                         seq_printf(seq, " - Attribute name: \"%s\", ",
1029                                    attrib->name);
1030                         seq_printf(seq, "value[%s]: ",
1031                                    ias_value_types[attrib->value->type]);
1032 
1033                         switch (attrib->value->type) {
1034                         case IAS_INTEGER:
1035                                 seq_printf(seq, "%d\n",
1036                                            attrib->value->t.integer);
1037                                 break;
1038                         case IAS_STRING:
1039                                 seq_printf(seq, "\"%s\"\n",
1040                                            attrib->value->t.string);
1041                                 break;
1042                         case IAS_OCT_SEQ:
1043                                 seq_printf(seq, "octet sequence (%d bytes)\n",
1044                                            attrib->value->len);
1045                                 break;
1046                         case IAS_MISSING:
1047                                 seq_puts(seq, "missing\n");
1048                                 break;
1049                         default:
1050                                 seq_printf(seq, "type %d?\n",
1051                                            attrib->value->type);
1052                         }
1053                         seq_putc(seq, '\n');
1054 
1055                 }
1056         IRDA_ASSERT_LABEL(outloop:)
1057                 spin_unlock(&obj->attribs->hb_spinlock);
1058         }
1059 
1060         return 0;
1061 }
1062 
1063 static const struct seq_operations irias_seq_ops = {
1064         .start  = irias_seq_start,
1065         .next   = irias_seq_next,
1066         .stop   = irias_seq_stop,
1067         .show   = irias_seq_show,
1068 };
1069 
1070 static int irias_seq_open(struct inode *inode, struct file *file)
1071 {
1072         IRDA_ASSERT( irias_objects != NULL, return -EINVAL;);
1073 
1074         return seq_open(file, &irias_seq_ops);
1075 }
1076 
1077 const struct file_operations irias_seq_fops = {
1078         .owner          = THIS_MODULE,
1079         .open           = irias_seq_open,
1080         .read           = seq_read,
1081         .llseek         = seq_lseek,
1082         .release        = seq_release,
1083 };
1084 
1085 #endif /* PROC_FS */
1086 

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