net/irda/irias_object.c

   1 /*********************************************************************
   2  *
   3  * Filename:      irias_object.c
   4  * Version:       0.3
   5  * Description:   IAS object database and functions
   6  * Status:        Experimental.
   7  * Author:        Dag Brattli <dagb@cs.uit.no>
   8  * Created at:    Thu Oct  1 22:50:04 1998
   9  * Modified at:   Wed Dec 15 11:23:16 1999
  10  * Modified by:   Dag Brattli <dagb@cs.uit.no>
  11  *
  12  *     Copyright (c) 1998-1999 Dag Brattli, All Rights Reserved.
  13  *
  14  *     This program is free software; you can redistribute it and/or
  15  *     modify it under the terms of the GNU General Public License as
  16  *     published by the Free Software Foundation; either version 2 of
  17  *     the License, or (at your option) any later version.
  18  *
  19  *     Neither Dag Brattli nor University of Tromsø admit liability nor
  20  *     provide warranty for any of this software. This material is
  21  *     provided "AS-IS" and at no charge.
  22  *
  23  ********************************************************************/
  24
  25 #include <linux/string.h>
  26 #include <linux/socket.h>
  27 #include <linux/module.h>
  28
  29 #include <net/irda/irda.h>
  30 #include <net/irda/irias_object.h>
  31
  32 hashbin_t *irias_objects;
  33
  34 /*
  35  *  Used when a missing value needs to be returned
  36  */
  37 struct ias_value irias_missing = { IAS_MISSING, 0, 0, 0, {0}};
  38
  39
  40 /*
  41  * Function ias_new_object (name, id)
  42  *
  43  *    Create a new IAS object
  44  *
  45  */
  46 struct ias_object *irias_new_object( char *name, int id)
  47 {
  48         struct ias_object *obj;
  49
  50         IRDA_DEBUG( 4, "%s()\n", __func__);
  51
  52         obj = kzalloc(sizeof(struct ias_object), GFP_ATOMIC);
  53         if (obj == NULL) {
  54                 IRDA_WARNING("%s(), Unable to allocate object!\n",
  55                              __func__);
  56                 return NULL;
  57         }
  58
  59         obj->magic = IAS_OBJECT_MAGIC;
  60         obj->name = kstrndup(name, IAS_MAX_CLASSNAME, GFP_ATOMIC);
  61         if (!obj->name) {
  62                 IRDA_WARNING("%s(), Unable to allocate name!\n",
  63                              __func__);
  64                 kfree(obj);
  65                 return NULL;
  66         }
  67         obj->id = id;
  68
  69         /* Locking notes : the attrib spinlock has lower precendence
  70          * than the objects spinlock. Never grap the objects spinlock
  71          * while holding any attrib spinlock (risk of deadlock). Jean II */
  72         obj->attribs = hashbin_new(HB_LOCK);
  73
  74         if (obj->attribs == NULL) {
  75                 IRDA_WARNING("%s(), Unable to allocate attribs!\n",
  76                              __func__);
  77                 kfree(obj->name);
  78                 kfree(obj);
  79                 return NULL;
  80         }
  81
  82         return obj;
  83 }
  84 EXPORT_SYMBOL(irias_new_object);
  85
  86 /*
  87  * Function irias_delete_attrib (attrib)
  88  *
  89  *    Delete given attribute and deallocate all its memory
  90  *
  91  */
  92 static void __irias_delete_attrib(struct ias_attrib *attrib)
  93 {
  94         IRDA_ASSERT(attrib != NULL, return;);
  95         IRDA_ASSERT(attrib->magic == IAS_ATTRIB_MAGIC, return;);
  96
  97         kfree(attrib->name);
  98
  99         irias_delete_value(attrib->value);
 100         attrib->magic = ~IAS_ATTRIB_MAGIC;
 101
 102         kfree(attrib);
 103 }
 104
 105 void __irias_delete_object(struct ias_object *obj)
 106 {
 107         IRDA_ASSERT(obj != NULL, return;);
 108         IRDA_ASSERT(obj->magic == IAS_OBJECT_MAGIC, return;);
 109
 110         kfree(obj->name);
 111
 112         hashbin_delete(obj->attribs, (FREE_FUNC) __irias_delete_attrib);
 113
 114         obj->magic = ~IAS_OBJECT_MAGIC;
 115
 116         kfree(obj);
 117 }
 118
 119 /*
 120  * Function irias_delete_object (obj)
 121  *
 122  *    Remove object from hashbin and deallocate all attributes associated with
 123  *    with this object and the object itself
 124  *
 125  */
 126 int irias_delete_object(struct ias_object *obj)
 127 {
 128         struct ias_object *node;
 129
 130         IRDA_ASSERT(obj != NULL, return -1;);
 131         IRDA_ASSERT(obj->magic == IAS_OBJECT_MAGIC, return -1;);
 132
 133         /* Remove from list */
 134         node = hashbin_remove_this(irias_objects, (irda_queue_t *) obj);
 135         if (!node)
 136                 IRDA_DEBUG( 0, "%s(), object already removed!\n",
 137                             __func__);
 138
 139         /* Destroy */
 140         __irias_delete_object(obj);
 141
 142         return 0;
 143 }
 144 EXPORT_SYMBOL(irias_delete_object);
 145
 146 /*
 147  * Function irias_delete_attrib (obj)
 148  *
 149  *    Remove attribute from hashbin and, if it was the last attribute of
 150  *    the object, remove the object as well.
 151  *
 152  */
 153 int irias_delete_attrib(struct ias_object *obj, struct ias_attrib *attrib,
 154                         int cleanobject)
 155 {
 156         struct ias_attrib *node;
 157
 158         IRDA_ASSERT(obj != NULL, return -1;);
 159         IRDA_ASSERT(obj->magic == IAS_OBJECT_MAGIC, return -1;);
 160         IRDA_ASSERT(attrib != NULL, return -1;);
 161
 162         /* Remove attribute from object */
 163         node = hashbin_remove_this(obj->attribs, (irda_queue_t *) attrib);
 164         if (!node)
 165                 return 0; /* Already removed or non-existent */
 166
 167         /* Deallocate attribute */
 168         __irias_delete_attrib(node);
 169
 170         /* Check if object has still some attributes, destroy it if none.
 171          * At first glance, this look dangerous, as the kernel reference
 172          * various IAS objects. However, we only use this function on
 173          * user attributes, not kernel attributes, so there is no risk
 174          * of deleting a kernel object this way. Jean II */
 175         node = (struct ias_attrib *) hashbin_get_first(obj->attribs);
 176         if (cleanobject && !node)
 177                 irias_delete_object(obj);
 178
 179         return 0;
 180 }
 181
 182 /*
 183  * Function irias_insert_object (obj)
 184  *
 185  *    Insert an object into the LM-IAS database
 186  *
 187  */
 188 void irias_insert_object(struct ias_object *obj)
 189 {
 190         IRDA_ASSERT(obj != NULL, return;);
 191         IRDA_ASSERT(obj->magic == IAS_OBJECT_MAGIC, return;);
 192
 193         hashbin_insert(irias_objects, (irda_queue_t *) obj, 0, obj->name);
 194 }
 195 EXPORT_SYMBOL(irias_insert_object);
 196
 197 /*
 198  * Function irias_find_object (name)
 199  *
 200  *    Find object with given name
 201  *
 202  */
 203 struct ias_object *irias_find_object(char *name)
 204 {
 205         IRDA_ASSERT(name != NULL, return NULL;);
 206
 207         /* Unsafe (locking), object might change */
 208         return hashbin_lock_find(irias_objects, 0, name);
 209 }
 210 EXPORT_SYMBOL(irias_find_object);
 211
 212 /*
 213  * Function irias_find_attrib (obj, name)
 214  *
 215  *    Find named attribute in object
 216  *
 217  */
 218 struct ias_attrib *irias_find_attrib(struct ias_object *obj, char *name)
 219 {
 220         struct ias_attrib *attrib;
 221
 222         IRDA_ASSERT(obj != NULL, return NULL;);
 223         IRDA_ASSERT(obj->magic == IAS_OBJECT_MAGIC, return NULL;);
 224         IRDA_ASSERT(name != NULL, return NULL;);
 225
 226         attrib = hashbin_lock_find(obj->attribs, 0, name);
 227         if (attrib == NULL)
 228                 return NULL;
 229
 230         /* Unsafe (locking), attrib might change */
 231         return attrib;
 232 }
 233
 234 /*
 235  * Function irias_add_attribute (obj, attrib)
 236  *
 237  *    Add attribute to object
 238  *
 239  */
 240 static void irias_add_attrib(struct ias_object *obj, struct ias_attrib *attrib,
 241                              int owner)
 242 {
 243         IRDA_ASSERT(obj != NULL, return;);
 244         IRDA_ASSERT(obj->magic == IAS_OBJECT_MAGIC, return;);
 245
 246         IRDA_ASSERT(attrib != NULL, return;);
 247         IRDA_ASSERT(attrib->magic == IAS_ATTRIB_MAGIC, return;);
 248
 249         /* Set if attrib is owned by kernel or user space */
 250         attrib->value->owner = owner;
 251
 252         hashbin_insert(obj->attribs, (irda_queue_t *) attrib, 0, attrib->name);
 253 }
 254
 255 /*
 256  * Function irias_object_change_attribute (obj_name, attrib_name, new_value)
 257  *
 258  *    Change the value of an objects attribute.
 259  *
 260  */
 261 int irias_object_change_attribute(char *obj_name, char *attrib_name,
 262                                   struct ias_value *new_value)
 263 {
 264         struct ias_object *obj;
 265         struct ias_attrib *attrib;
 266         unsigned long flags;
 267
 268         /* Find object */
 269         obj = hashbin_lock_find(irias_objects, 0, obj_name);
 270         if (obj == NULL) {
 271                 IRDA_WARNING("%s: Unable to find object: %s\n", __func__,
 272                              obj_name);
 273                 return -1;
 274         }
 275
 276         /* Slightly unsafe (obj might get removed under us) */
 277         spin_lock_irqsave(&obj->attribs->hb_spinlock, flags);
 278
 279         /* Find attribute */
 280         attrib = hashbin_find(obj->attribs, 0, attrib_name);
 281         if (attrib == NULL) {
 282                 IRDA_WARNING("%s: Unable to find attribute: %s\n",
 283                              __func__, attrib_name);
 284                 spin_unlock_irqrestore(&obj->attribs->hb_spinlock, flags);
 285                 return -1;
 286         }
 287
 288         if ( attrib->value->type != new_value->type) {
 289                 IRDA_DEBUG( 0, "%s(), changing value type not allowed!\n",
 290                             __func__);
 291                 spin_unlock_irqrestore(&obj->attribs->hb_spinlock, flags);
 292                 return -1;
 293         }
 294
 295         /* Delete old value */
 296         irias_delete_value(attrib->value);
 297
 298         /* Insert new value */
 299         attrib->value = new_value;
 300
 301         /* Success */
 302         spin_unlock_irqrestore(&obj->attribs->hb_spinlock, flags);
 303         return 0;
 304 }
 305 EXPORT_SYMBOL(irias_object_change_attribute);
 306
 307 /*
 308  * Function irias_object_add_integer_attrib (obj, name, value)
 309  *
 310  *    Add an integer attribute to an LM-IAS object
 311  *
 312  */
 313 void irias_add_integer_attrib(struct ias_object *obj, char *name, int value,
 314                               int owner)
 315 {
 316         struct ias_attrib *attrib;
 317
 318         IRDA_ASSERT(obj != NULL, return;);
 319         IRDA_ASSERT(obj->magic == IAS_OBJECT_MAGIC, return;);
 320         IRDA_ASSERT(name != NULL, return;);
 321
 322         attrib = kzalloc(sizeof(struct ias_attrib), GFP_ATOMIC);
 323         if (attrib == NULL) {
 324                 IRDA_WARNING("%s: Unable to allocate attribute!\n",
 325                              __func__);
 326                 return;
 327         }
 328
 329         attrib->magic = IAS_ATTRIB_MAGIC;
 330         attrib->name = kstrndup(name, IAS_MAX_ATTRIBNAME, GFP_ATOMIC);
 331
 332         /* Insert value */
 333         attrib->value = irias_new_integer_value(value);
 334         if (!attrib->name || !attrib->value) {
 335                 IRDA_WARNING("%s: Unable to allocate attribute!\n",
 336                              __func__);
 337                 if (attrib->value)
 338                         irias_delete_value(attrib->value);
 339                 kfree(attrib->name);
 340                 kfree(attrib);
 341                 return;
 342         }
 343
 344         irias_add_attrib(obj, attrib, owner);
 345 }
 346 EXPORT_SYMBOL(irias_add_integer_attrib);
 347
 348  /*
 349  * Function irias_add_octseq_attrib (obj, name, octet_seq, len)
 350  *
 351  *    Add a octet sequence attribute to an LM-IAS object
 352  *
 353  */
 354
 355 void irias_add_octseq_attrib(struct ias_object *obj, char *name, __u8 *octets,
 356                              int len, int owner)
 357 {
 358         struct ias_attrib *attrib;
 359
 360         IRDA_ASSERT(obj != NULL, return;);
 361         IRDA_ASSERT(obj->magic == IAS_OBJECT_MAGIC, return;);
 362
 363         IRDA_ASSERT(name != NULL, return;);
 364         IRDA_ASSERT(octets != NULL, return;);
 365
 366         attrib = kzalloc(sizeof(struct ias_attrib), GFP_ATOMIC);
 367         if (attrib == NULL) {
 368                 IRDA_WARNING("%s: Unable to allocate attribute!\n",
 369                              __func__);
 370                 return;
 371         }
 372
 373         attrib->magic = IAS_ATTRIB_MAGIC;
 374         attrib->name = kstrndup(name, IAS_MAX_ATTRIBNAME, GFP_ATOMIC);
 375
 376         attrib->value = irias_new_octseq_value( octets, len);
 377         if (!attrib->name || !attrib->value) {
 378                 IRDA_WARNING("%s: Unable to allocate attribute!\n",
 379                              __func__);
 380                 if (attrib->value)
 381                         irias_delete_value(attrib->value);
 382                 kfree(attrib->name);
 383                 kfree(attrib);
 384                 return;
 385         }
 386
 387         irias_add_attrib(obj, attrib, owner);
 388 }
 389 EXPORT_SYMBOL(irias_add_octseq_attrib);
 390
 391 /*
 392  * Function irias_object_add_string_attrib (obj, string)
 393  *
 394  *    Add a string attribute to an LM-IAS object
 395  *
 396  */
 397 void irias_add_string_attrib(struct ias_object *obj, char *name, char *value,
 398                              int owner)
 399 {
 400         struct ias_attrib *attrib;
 401
 402         IRDA_ASSERT(obj != NULL, return;);
 403         IRDA_ASSERT(obj->magic == IAS_OBJECT_MAGIC, return;);
 404
 405         IRDA_ASSERT(name != NULL, return;);
 406         IRDA_ASSERT(value != NULL, return;);
 407
 408         attrib = kzalloc(sizeof( struct ias_attrib), GFP_ATOMIC);
 409         if (attrib == NULL) {
 410                 IRDA_WARNING("%s: Unable to allocate attribute!\n",
 411                              __func__);
 412                 return;
 413         }
 414
 415         attrib->magic = IAS_ATTRIB_MAGIC;
 416         attrib->name = kstrndup(name, IAS_MAX_ATTRIBNAME, GFP_ATOMIC);
 417
 418         attrib->value = irias_new_string_value(value);
 419         if (!attrib->name || !attrib->value) {
 420                 IRDA_WARNING("%s: Unable to allocate attribute!\n",
 421                              __func__);
 422                 if (attrib->value)
 423                         irias_delete_value(attrib->value);
 424                 kfree(attrib->name);
 425                 kfree(attrib);
 426                 return;
 427         }
 428
 429         irias_add_attrib(obj, attrib, owner);
 430 }
 431 EXPORT_SYMBOL(irias_add_string_attrib);
 432
 433 /*
 434  * Function irias_new_integer_value (integer)
 435  *
 436  *    Create new IAS integer value
 437  *
 438  */
 439 struct ias_value *irias_new_integer_value(int integer)
 440 {
 441         struct ias_value *value;
 442
 443         value = kzalloc(sizeof(struct ias_value), GFP_ATOMIC);
 444         if (value == NULL) {
 445                 IRDA_WARNING("%s: Unable to kmalloc!\n", __func__);
 446                 return NULL;
 447         }
 448
 449         value->type = IAS_INTEGER;
 450         value->len = 4;
 451         value->t.integer = integer;
 452
 453         return value;
 454 }
 455 EXPORT_SYMBOL(irias_new_integer_value);
 456
 457 /*
 458  * Function irias_new_string_value (string)
 459  *
 460  *    Create new IAS string value
 461  *
 462  * Per IrLMP 1.1, 4.3.3.2, strings are up to 256 chars - Jean II
 463  */
 464 struct ias_value *irias_new_string_value(char *string)
 465 {
 466         struct ias_value *value;
 467
 468         value = kzalloc(sizeof(struct ias_value), GFP_ATOMIC);
 469         if (value == NULL) {
 470                 IRDA_WARNING("%s: Unable to kmalloc!\n", __func__);
 471                 return NULL;
 472         }
 473
 474         value->type = IAS_STRING;
 475         value->charset = CS_ASCII;
 476         value->t.string = kstrndup(string, IAS_MAX_STRING, GFP_ATOMIC);
 477         if (!value->t.string) {
 478                 IRDA_WARNING("%s: Unable to kmalloc!\n", __func__);
 479                 kfree(value);
 480                 return NULL;
 481         }
 482
 483         value->len = strlen(value->t.string);
 484
 485         return value;
 486 }
 487
 488 /*
 489  * Function irias_new_octseq_value (octets, len)
 490  *
 491  *    Create new IAS octet-sequence value
 492  *
 493  * Per IrLMP 1.1, 4.3.3.2, octet-sequence are up to 1024 bytes - Jean II
 494  */
 495 struct ias_value *irias_new_octseq_value(__u8 *octseq , int len)
 496 {
 497         struct ias_value *value;
 498
 499         value = kzalloc(sizeof(struct ias_value), GFP_ATOMIC);
 500         if (value == NULL) {
 501                 IRDA_WARNING("%s: Unable to kmalloc!\n", __func__);
 502                 return NULL;
 503         }
 504
 505         value->type = IAS_OCT_SEQ;
 506         /* Check length */
 507         if(len > IAS_MAX_OCTET_STRING)
 508                 len = IAS_MAX_OCTET_STRING;
 509         value->len = len;
 510
 511         value->t.oct_seq = kmemdup(octseq, len, GFP_ATOMIC);
 512         if (value->t.oct_seq == NULL){
 513                 IRDA_WARNING("%s: Unable to kmalloc!\n", __func__);
 514                 kfree(value);
 515                 return NULL;
 516         }
 517         return value;
 518 }
 519
 520 struct ias_value *irias_new_missing_value(void)
 521 {
 522         struct ias_value *value;
 523
 524         value = kzalloc(sizeof(struct ias_value), GFP_ATOMIC);
 525         if (value == NULL) {
 526                 IRDA_WARNING("%s: Unable to kmalloc!\n", __func__);
 527                 return NULL;
 528         }
 529
 530         value->type = IAS_MISSING;
 531
 532         return value;
 533 }
 534
 535 /*
 536  * Function irias_delete_value (value)
 537  *
 538  *    Delete IAS value
 539  *
 540  */
 541 void irias_delete_value(struct ias_value *value)
 542 {
 543         IRDA_DEBUG(4, "%s()\n", __func__);
 544
 545         IRDA_ASSERT(value != NULL, return;);
 546
 547         switch (value->type) {
 548         case IAS_INTEGER: /* Fallthrough */
 549         case IAS_MISSING:
 550                 /* No need to deallocate */
 551                 break;
 552         case IAS_STRING:
 553                 /* Deallocate string */
 554                 kfree(value->t.string);
 555                 break;
 556         case IAS_OCT_SEQ:
 557                 /* Deallocate byte stream */
 558                  kfree(value->t.oct_seq);
 559                  break;
 560         default:
 561                 IRDA_DEBUG(0, "%s(), Unknown value type!\n", __func__);
 562                 break;
 563         }
 564         kfree(value);
 565 }
 566 EXPORT_SYMBOL(irias_delete_value);