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/*-
* Copyright 1999 Precision Insight, Inc., Cedar Park, Texas.
* Copyright 2000 VA Linux Systems, Inc., Sunnyvale, California.
* All Rights Reserved.
*
* Permission is hereby granted, free of charge, to any person obtaining a
* copy of this software and associated documentation files (the "Software"),
* to deal in the Software without restriction, including without limitation
* the rights to use, copy, modify, merge, publish, distribute, sublicense,
* and/or sell copies of the Software, and to permit persons to whom the
* Software is furnished to do so, subject to the following conditions:
*
* The above copyright notice and this permission notice (including the next
* paragraph) shall be included in all copies or substantial portions of the
* Software.
*
* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
* IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
* FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL
* VA LINUX SYSTEMS AND/OR ITS SUPPLIERS BE LIABLE FOR ANY CLAIM, DAMAGES OR
* OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE,
* ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR
* OTHER DEALINGS IN THE SOFTWARE.
*
* Authors:
* Rickard E. (Rik) Faith <faith@valinux.com>
* Gareth Hughes <gareth@valinux.com>
*
*/
/** @file drm_auth.c
* Implementation of the get/authmagic ioctls implementing the authentication
* scheme between the master and clients.
*/
#include "drmP.h"
struct drm_file *drm_find_file(struct drm_device *, drm_magic_t);
int drm_add_magic(struct drm_device *, struct drm_file *,
drm_magic_t);
int drm_remove_magic(struct drm_device *, drm_magic_t);
/**
* Returns the file private associated with the given magic number.
*/
struct drm_file *
drm_find_file(struct drm_device *dev, drm_magic_t magic)
{
struct drm_magic_entry *pt;
struct drm_magic_entry key;
DRM_SPINLOCK_ASSERT(&dev->dev_lock);
key.magic = magic;
if ((pt = SPLAY_FIND(drm_magic_tree, &dev->magiclist, &key)) != NULL)
return (pt->priv);
return (NULL);
}
/**
* Inserts the given magic number into the hash table of used magic number
* lists.
*/
int
drm_add_magic(struct drm_device *dev, struct drm_file *priv, drm_magic_t magic)
{
struct drm_magic_entry *entry;
DRM_DEBUG("%d\n", magic);
DRM_SPINLOCK_ASSERT(&dev->dev_lock);
if ((entry = malloc(sizeof(*entry), M_DRM, M_ZERO | M_NOWAIT)) == NULL)
return (ENOMEM);
entry->magic = magic;
entry->priv = priv;
SPLAY_INSERT(drm_magic_tree, &dev->magiclist, entry);
return (0);
}
/**
* Removes the given magic number from the hash table of used magic number
* lists.
*/
int
drm_remove_magic(struct drm_device *dev, drm_magic_t magic)
{
struct drm_magic_entry *pt;
struct drm_magic_entry key;
DRM_SPINLOCK_ASSERT(&dev->dev_lock);
DRM_DEBUG("%d\n", magic);
key.magic = magic;
if ((pt = SPLAY_FIND(drm_magic_tree, &dev->magiclist, &key)) == NULL)
return (EINVAL);
SPLAY_REMOVE(drm_magic_tree, &dev->magiclist, pt);
free(pt, M_DRM);
return (0);
}
/**
* Called by the client, this returns a unique magic number to be authorized
* by the master.
*
* The master may use its own knowledge of the client (such as the X
* connection that the magic is passed over) to determine if the magic number
* should be authenticated.
*/
int
drm_getmagic(struct drm_device *dev, void *data, struct drm_file *file_priv)
{
static drm_magic_t sequence = 0;
drm_auth_t *auth = data;
/* Find unique magic */
if (file_priv->magic) {
auth->magic = file_priv->magic;
} else {
DRM_LOCK();
do {
int old = sequence;
auth->magic = ++old;
if (!atomic_cmpset_int(&sequence, old, auth->magic))
continue;
} while (drm_find_file(dev, auth->magic));
file_priv->magic = auth->magic;
drm_add_magic(dev, file_priv, auth->magic);
DRM_UNLOCK();
}
DRM_DEBUG("%u\n", auth->magic);
return (0);
}
/**
* Marks the client associated with the given magic number as authenticated.
*/
int
drm_authmagic(struct drm_device *dev, void *data, struct drm_file *file_priv)
{
drm_auth_t *auth = data;
struct drm_file *priv;
DRM_DEBUG("%u\n", auth->magic);
DRM_LOCK();
priv = drm_find_file(dev, auth->magic);
if (priv != NULL) {
priv->authenticated = 1;
drm_remove_magic(dev, auth->magic);
DRM_UNLOCK();
return (0);
} else {
DRM_UNLOCK();
return (EINVAL);
}
}
int
drm_magic_cmp(struct drm_magic_entry *dme1, struct drm_magic_entry *dme2)
{
return (dme1->magic - dme2->magic);
}
SPLAY_GENERATE(drm_magic_tree, drm_magic_entry, node, drm_magic_cmp);
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