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-rw-r--r--net/irda/irias_object.c555
1 files changed, 555 insertions, 0 deletions
diff --git a/net/irda/irias_object.c b/net/irda/irias_object.c
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+/*********************************************************************
+ *
+ * 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/slab.h>
+#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;
+
+ obj = kzalloc(sizeof(struct ias_object), GFP_ATOMIC);
+ if (obj == NULL) {
+ net_warn_ratelimited("%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) {
+ net_warn_ratelimited("%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) {
+ net_warn_ratelimited("%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)
+ pr_debug("%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) {
+ net_warn_ratelimited("%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) {
+ net_warn_ratelimited("%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) {
+ pr_debug("%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) {
+ net_warn_ratelimited("%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) {
+ net_warn_ratelimited("%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) {
+ net_warn_ratelimited("%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) {
+ net_warn_ratelimited("%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) {
+ net_warn_ratelimited("%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) {
+ net_warn_ratelimited("%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)
+ 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)
+ return NULL;
+
+ value->type = IAS_STRING;
+ value->charset = CS_ASCII;
+ value->t.string = kstrndup(string, IAS_MAX_STRING, GFP_ATOMIC);
+ if (!value->t.string) {
+ net_warn_ratelimited("%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)
+ 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){
+ net_warn_ratelimited("%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)
+ 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_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:
+ pr_debug("%s(), Unknown value type!\n", __func__);
+ break;
+ }
+ kfree(value);
+}
+EXPORT_SYMBOL(irias_delete_value);
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