/********************************************************************* * * Filename: irias_object.c * Version: 0.3 * Description: IAS object database and functions * Status: Experimental. * Author: Dag Brattli <dagb@cs.uit.no> * Created at: Thu Oct 1 22:50:04 1998 * Modified at: Wed Dec 15 11:23:16 1999 * Modified by: Dag Brattli <dagb@cs.uit.no> * * Copyright (c) 1998-1999 Dag Brattli, All Rights Reserved. * * This program is free software; you can redistribute it and/or * modify it under the terms of the GNU General Public License as * published by the Free Software Foundation; either version 2 of * the License, or (at your option) any later version. * * Neither Dag Brattli nor University of Tromsø admit liability nor * provide warranty for any of this software. This material is * provided "AS-IS" and at no charge. * ********************************************************************/ #include <linux/string.h> #include <linux/socket.h> #include <linux/module.h> #include <net/irda/irda.h> #include <net/irda/irias_object.h> hashbin_t *irias_objects; /* * Used when a missing value needs to be returned */ struct ias_value irias_missing = { IAS_MISSING, 0, 0, 0, {0}}; /* * Function ias_new_object (name, id) * * Create a new IAS object * */ struct ias_object *irias_new_object( char *name, int id) { struct ias_object *obj; IRDA_DEBUG( 4, "%s()\n", __func__); obj = kzalloc(sizeof(struct ias_object), GFP_ATOMIC); if (obj == NULL) { IRDA_WARNING("%s(), Unable to allocate object!\n", __func__); return NULL; } obj->magic = IAS_OBJECT_MAGIC; obj->name = kstrndup(name, IAS_MAX_CLASSNAME, GFP_ATOMIC); if (!obj->name) { IRDA_WARNING("%s(), Unable to allocate name!\n", __func__); kfree(obj); return NULL; } obj->id = id; /* Locking notes : the attrib spinlock has lower precendence * than the objects spinlock. Never grap the objects spinlock * while holding any attrib spinlock (risk of deadlock). Jean II */ obj->attribs = hashbin_new(HB_LOCK); if (obj->attribs == NULL) { IRDA_WARNING("%s(), Unable to allocate attribs!\n", __func__); kfree(obj->name); kfree(obj); return NULL; } return obj; } EXPORT_SYMBOL(irias_new_object); /* * Function irias_delete_attrib (attrib) * * Delete given attribute and deallocate all its memory * */ static void __irias_delete_attrib(struct ias_attrib *attrib) { IRDA_ASSERT(attrib != NULL, return;); IRDA_ASSERT(attrib->magic == IAS_ATTRIB_MAGIC, return;); kfree(attrib->name); irias_delete_value(attrib->value); attrib->magic = ~IAS_ATTRIB_MAGIC; kfree(attrib); } void __irias_delete_object(struct ias_object *obj) { IRDA_ASSERT(obj != NULL, return;); IRDA_ASSERT(obj->magic == IAS_OBJECT_MAGIC, return;); kfree(obj->name); hashbin_delete(obj->attribs, (FREE_FUNC) __irias_delete_attrib); obj->magic = ~IAS_OBJECT_MAGIC; kfree(obj); } /* * Function irias_delete_object (obj) * * Remove object from hashbin and deallocate all attributes associated with * with this object and the object itself * */ int irias_delete_object(struct ias_object *obj) { struct ias_object *node; IRDA_ASSERT(obj != NULL, return -1;); IRDA_ASSERT(obj->magic == IAS_OBJECT_MAGIC, return -1;); /* Remove from list */ node = hashbin_remove_this(irias_objects, (irda_queue_t *) obj); if (!node) IRDA_DEBUG( 0, "%s(), object already removed!\n", __func__); /* Destroy */ __irias_delete_object(obj); return 0; } EXPORT_SYMBOL(irias_delete_object); /* * Function irias_delete_attrib (obj) * * Remove attribute from hashbin and, if it was the last attribute of * the object, remove the object as well. * */ int irias_delete_attrib(struct ias_object *obj, struct ias_attrib *attrib, int cleanobject) { struct ias_attrib *node; IRDA_ASSERT(obj != NULL, return -1;); IRDA_ASSERT(obj->magic == IAS_OBJECT_MAGIC, return -1;); IRDA_ASSERT(attrib != NULL, return -1;); /* Remove attribute from object */ node = hashbin_remove_this(obj->attribs, (irda_queue_t *) attrib); if (!node) return 0; /* Already removed or non-existent */ /* Deallocate attribute */ __irias_delete_attrib(node); /* Check if object has still some attributes, destroy it if none. * At first glance, this look dangerous, as the kernel reference * various IAS objects. However, we only use this function on * user attributes, not kernel attributes, so there is no risk * of deleting a kernel object this way. Jean II */ node = (struct ias_attrib *) hashbin_get_first(obj->attribs); if (cleanobject && !node) irias_delete_object(obj); return 0; } /* * Function irias_insert_object (obj) * * Insert an object into the LM-IAS database * */ void irias_insert_object(struct ias_object *obj) { IRDA_ASSERT(obj != NULL, return;); IRDA_ASSERT(obj->magic == IAS_OBJECT_MAGIC, return;); hashbin_insert(irias_objects, (irda_queue_t *) obj, 0, obj->name); } EXPORT_SYMBOL(irias_insert_object); /* * Function irias_find_object (name) * * Find object with given name * */ struct ias_object *irias_find_object(char *name) { IRDA_ASSERT(name != NULL, return NULL;); /* Unsafe (locking), object might change */ return hashbin_lock_find(irias_objects, 0, name); } EXPORT_SYMBOL(irias_find_object); /* * Function irias_find_attrib (obj, name) * * Find named attribute in object * */ struct ias_attrib *irias_find_attrib(struct ias_object *obj, char *name) { struct ias_attrib *attrib; IRDA_ASSERT(obj != NULL, return NULL;); IRDA_ASSERT(obj->magic == IAS_OBJECT_MAGIC, return NULL;); IRDA_ASSERT(name != NULL, return NULL;); attrib = hashbin_lock_find(obj->attribs, 0, name); if (attrib == NULL) return NULL; /* Unsafe (locking), attrib might change */ return attrib; } /* * Function irias_add_attribute (obj, attrib) * * Add attribute to object * */ static void irias_add_attrib(struct ias_object *obj, struct ias_attrib *attrib, int owner) { IRDA_ASSERT(obj != NULL, return;); IRDA_ASSERT(obj->magic == IAS_OBJECT_MAGIC, return;); IRDA_ASSERT(attrib != NULL, return;); IRDA_ASSERT(attrib->magic == IAS_ATTRIB_MAGIC, return;); /* Set if attrib is owned by kernel or user space */ attrib->value->owner = owner; hashbin_insert(obj->attribs, (irda_queue_t *) attrib, 0, attrib->name); } /* * Function irias_object_change_attribute (obj_name, attrib_name, new_value) * * Change the value of an objects attribute. * */ int irias_object_change_attribute(char *obj_name, char *attrib_name, struct ias_value *new_value) { struct ias_object *obj; struct ias_attrib *attrib; unsigned long flags; /* Find object */ obj = hashbin_lock_find(irias_objects, 0, obj_name); if (obj == NULL) { IRDA_WARNING("%s: Unable to find object: %s\n", __func__, obj_name); return -1; } /* Slightly unsafe (obj might get removed under us) */ spin_lock_irqsave(&obj->attribs->hb_spinlock, flags); /* Find attribute */ attrib = hashbin_find(obj->attribs, 0, attrib_name); if (attrib == NULL) { IRDA_WARNING("%s: Unable to find attribute: %s\n", __func__, attrib_name); spin_unlock_irqrestore(&obj->attribs->hb_spinlock, flags); return -1; } if ( attrib->value->type != new_value->type) { IRDA_DEBUG( 0, "%s(), changing value type not allowed!\n", __func__); spin_unlock_irqrestore(&obj->attribs->hb_spinlock, flags); return -1; } /* Delete old value */ irias_delete_value(attrib->value); /* Insert new value */ attrib->value = new_value; /* Success */ spin_unlock_irqrestore(&obj->attribs->hb_spinlock, flags); return 0; } EXPORT_SYMBOL(irias_object_change_attribute); /* * Function irias_object_add_integer_attrib (obj, name, value) * * Add an integer attribute to an LM-IAS object * */ void irias_add_integer_attrib(struct ias_object *obj, char *name, int value, int owner) { struct ias_attrib *attrib; IRDA_ASSERT(obj != NULL, return;); IRDA_ASSERT(obj->magic == IAS_OBJECT_MAGIC, return;); IRDA_ASSERT(name != NULL, return;); attrib = kzalloc(sizeof(struct ias_attrib), GFP_ATOMIC); if (attrib == NULL) { IRDA_WARNING("%s: Unable to allocate attribute!\n", __func__); return; } attrib->magic = IAS_ATTRIB_MAGIC; attrib->name = kstrndup(name, IAS_MAX_ATTRIBNAME, GFP_ATOMIC); /* Insert value */ attrib->value = irias_new_integer_value(value); if (!attrib->name || !attrib->value) { IRDA_WARNING("%s: Unable to allocate attribute!\n", __func__); if (attrib->value) irias_delete_value(attrib->value); kfree(attrib->name); kfree(attrib); return; } irias_add_attrib(obj, attrib, owner); } EXPORT_SYMBOL(irias_add_integer_attrib); /* * Function irias_add_octseq_attrib (obj, name, octet_seq, len) * * Add a octet sequence attribute to an LM-IAS object * */ void irias_add_octseq_attrib(struct ias_object *obj, char *name, __u8 *octets, int len, int owner) { struct ias_attrib *attrib; IRDA_ASSERT(obj != NULL, return;); IRDA_ASSERT(obj->magic == IAS_OBJECT_MAGIC, return;); IRDA_ASSERT(name != NULL, return;); IRDA_ASSERT(octets != NULL, return;); attrib = kzalloc(sizeof(struct ias_attrib), GFP_ATOMIC); if (attrib == NULL) { IRDA_WARNING("%s: Unable to allocate attribute!\n", __func__); return; } attrib->magic = IAS_ATTRIB_MAGIC; attrib->name = kstrndup(name, IAS_MAX_ATTRIBNAME, GFP_ATOMIC); attrib->value = irias_new_octseq_value( octets, len); if (!attrib->name || !attrib->value) { IRDA_WARNING("%s: Unable to allocate attribute!\n", __func__); if (attrib->value) irias_delete_value(attrib->value); kfree(attrib->name); kfree(attrib); return; } irias_add_attrib(obj, attrib, owner); } EXPORT_SYMBOL(irias_add_octseq_attrib); /* * Function irias_object_add_string_attrib (obj, string) * * Add a string attribute to an LM-IAS object * */ void irias_add_string_attrib(struct ias_object *obj, char *name, char *value, int owner) { struct ias_attrib *attrib; IRDA_ASSERT(obj != NULL, return;); IRDA_ASSERT(obj->magic == IAS_OBJECT_MAGIC, return;); IRDA_ASSERT(name != NULL, return;); IRDA_ASSERT(value != NULL, return;); attrib = kzalloc(sizeof( struct ias_attrib), GFP_ATOMIC); if (attrib == NULL) { IRDA_WARNING("%s: Unable to allocate attribute!\n", __func__); return; } attrib->magic = IAS_ATTRIB_MAGIC; attrib->name = kstrndup(name, IAS_MAX_ATTRIBNAME, GFP_ATOMIC); attrib->value = irias_new_string_value(value); if (!attrib->name || !attrib->value) { IRDA_WARNING("%s: Unable to allocate attribute!\n", __func__); if (attrib->value) irias_delete_value(attrib->value); kfree(attrib->name); kfree(attrib); return; } irias_add_attrib(obj, attrib, owner); } EXPORT_SYMBOL(irias_add_string_attrib); /* * Function irias_new_integer_value (integer) * * Create new IAS integer value * */ struct ias_value *irias_new_integer_value(int integer) { struct ias_value *value; value = kzalloc(sizeof(struct ias_value), GFP_ATOMIC); if (value == NULL) { IRDA_WARNING("%s: Unable to kmalloc!\n", __func__); return NULL; } value->type = IAS_INTEGER; value->len = 4; value->t.integer = integer; return value; } EXPORT_SYMBOL(irias_new_integer_value); /* * Function irias_new_string_value (string) * * Create new IAS string value * * Per IrLMP 1.1, 4.3.3.2, strings are up to 256 chars - Jean II */ struct ias_value *irias_new_string_value(char *string) { struct ias_value *value; value = kzalloc(sizeof(struct ias_value), GFP_ATOMIC); if (value == NULL) { IRDA_WARNING("%s: Unable to kmalloc!\n", __func__); return NULL; } value->type = IAS_STRING; value->charset = CS_ASCII; value->t.string = kstrndup(string, IAS_MAX_STRING, GFP_ATOMIC); if (!value->t.string) { IRDA_WARNING("%s: Unable to kmalloc!\n", __func__); kfree(value); return NULL; } value->len = strlen(value->t.string); return value; } /* * Function irias_new_octseq_value (octets, len) * * Create new IAS octet-sequence value * * Per IrLMP 1.1, 4.3.3.2, octet-sequence are up to 1024 bytes - Jean II */ struct ias_value *irias_new_octseq_value(__u8 *octseq , int len) { struct ias_value *value; value = kzalloc(sizeof(struct ias_value), GFP_ATOMIC); if (value == NULL) { IRDA_WARNING("%s: Unable to kmalloc!\n", __func__); return NULL; } value->type = IAS_OCT_SEQ; /* Check length */ if(len > IAS_MAX_OCTET_STRING) len = IAS_MAX_OCTET_STRING; value->len = len; value->t.oct_seq = kmemdup(octseq, len, GFP_ATOMIC); if (value->t.oct_seq == NULL){ IRDA_WARNING("%s: Unable to kmalloc!\n", __func__); kfree(value); return NULL; } return value; } struct ias_value *irias_new_missing_value(void) { struct ias_value *value; value = kzalloc(sizeof(struct ias_value), GFP_ATOMIC); if (value == NULL) { IRDA_WARNING("%s: Unable to kmalloc!\n", __func__); return NULL; } value->type = IAS_MISSING; return value; } /* * Function irias_delete_value (value) * * Delete IAS value * */ void irias_delete_value(struct ias_value *value) { IRDA_DEBUG(4, "%s()\n", __func__); IRDA_ASSERT(value != NULL, return;); switch (value->type) { case IAS_INTEGER: /* Fallthrough */ case IAS_MISSING: /* No need to deallocate */ break; case IAS_STRING: /* Deallocate string */ kfree(value->t.string); break; case IAS_OCT_SEQ: /* Deallocate byte stream */ kfree(value->t.oct_seq); break; default: IRDA_DEBUG(0, "%s(), Unknown value type!\n", __func__); break; } kfree(value); } EXPORT_SYMBOL(irias_delete_value);