/*********************************************************************
*
* 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 strndup (str, max)
*
* My own kernel version of strndup!
*
* Faster, check boundary... Jean II
*/
static char *strndup(char *str, int max)
{
char *new_str;
int len;
/* Check string */
if (str == NULL)
return NULL;
/* Check length, truncate */
len = strlen(str);
if(len > max)
len = max;
/* Allocate new string */
new_str = kmalloc(len + 1, GFP_ATOMIC);
if (new_str == NULL) {
IRDA_WARNING("%s: Unable to kmalloc!\n", __FUNCTION__);
return NULL;
}
/* Copy and truncate */
memcpy(new_str, str, len);
new_str[len] = '\0';
return new_str;
}
/*
* 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", __FUNCTION__);
obj = kzalloc(sizeof(struct ias_object), GFP_ATOMIC);
if (obj == NULL) {
IRDA_WARNING("%s(), Unable to allocate object!\n",
__FUNCTION__);
return NULL;
}
obj->magic = IAS_OBJECT_MAGIC;
obj->name = strndup(name, IAS_MAX_CLASSNAME);
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",
__FUNCTION__);
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",
__FUNCTION__);
/* 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", __FUNCTION__,
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",
__FUNCTION__, 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",
__FUNCTION__);
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",
__FUNCTION__);
return;
}
attrib->magic = IAS_ATTRIB_MAGIC;
attrib->name = strndup(name, IAS_MAX_ATTRIBNAME);
/* Insert value */
attrib->value = irias_new_integer_value(value);
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",
__FUNCTION__);
return;
}
attrib->magic = IAS_ATTRIB_MAGIC;
attrib->name = strndup(name, IAS_MAX_ATTRIBNAME);
attrib->value = irias_new_octseq_value( octets, len);
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",
__FUNCTION__);
return;
}
attrib->magic = IAS_ATTRIB_MAGIC;
attrib->name = strndup(name, IAS_MAX_ATTRIBNAME);
attrib->value = irias_new_string_value(value);
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", __FUNCTION__);
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", __FUNCTION__);
return NULL;
}
value->type = IAS_STRING;
value->charset = CS_ASCII;
value->t.string = strndup(string, IAS_MAX_STRING);
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", __FUNCTION__);
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 = kmalloc(len, GFP_ATOMIC);
if (value->t.oct_seq == NULL){
IRDA_WARNING("%s: Unable to kmalloc!\n", __FUNCTION__);
kfree(value);
return NULL;
}
memcpy(value->t.oct_seq, octseq , len);
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", __FUNCTION__);
return NULL;
}
value->type = IAS_MISSING;
value->len = 0;
return value;
}
/*
* Function irias_delete_value (value)
*
* Delete IAS value
*
*/
void irias_delete_value(struct ias_value *value)
{
IRDA_DEBUG(4, "%s()\n", __FUNCTION__);
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", __FUNCTION__);
break;
}
kfree(value);
}
EXPORT_SYMBOL(irias_delete_value);
