/*
* Copyright (c) 2006, 2011, Oracle and/or its affiliates. All rights reserved.
*/
/*
* drm_auth.h -- IOCTLs for authentication -*- linux-c -*-
* Created: Tue Feb 2 08:37:54 1999 by faith@valinux.com
*/
/*
* 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>
*
*/
#include "drmP.h"
static int
drm_hash_magic(drm_magic_t magic)
{
return (magic & (DRM_HASH_SIZE-1));
}
drm_file_t *
drm_find_file(drm_device_t *dev, drm_magic_t magic)
{
drm_file_t *retval = NULL;
drm_magic_entry_t *pt;
int hash;
hash = drm_hash_magic(magic);
for (pt = dev->magiclist[hash].head; pt; pt = pt->next) {
if (pt->magic == magic) {
retval = pt->priv;
break;
}
}
return (retval);
}
static int
drm_add_magic(drm_device_t *dev, drm_file_t *priv, drm_magic_t magic)
{
int hash;
drm_magic_entry_t *entry;
hash = drm_hash_magic(magic);
entry = drm_alloc(sizeof (*entry), DRM_MEM_MAGIC);
if (!entry)
return (ENOMEM);
entry->magic = magic;
entry->priv = priv;
entry->next = NULL;
DRM_LOCK();
if (dev->magiclist[hash].tail) {
dev->magiclist[hash].tail->next = entry;
dev->magiclist[hash].tail = entry;
} else {
dev->magiclist[hash].head = entry;
dev->magiclist[hash].tail = entry;
}
DRM_UNLOCK();
return (0);
}
int
drm_remove_magic(drm_device_t *dev, drm_magic_t magic)
{
drm_magic_entry_t *prev = NULL;
drm_magic_entry_t *pt;
int hash;
DRM_DEBUG("drm_remove_magic : %d", magic);
hash = drm_hash_magic(magic);
DRM_LOCK();
for (pt = dev->magiclist[hash].head; pt; prev = pt, pt = pt->next) {
if (pt->magic == magic) {
if (dev->magiclist[hash].head == pt) {
dev->magiclist[hash].head = pt->next;
}
if (dev->magiclist[hash].tail == pt) {
dev->magiclist[hash].tail = prev;
}
if (prev) {
prev->next = pt->next;
}
DRM_UNLOCK();
drm_free(pt, sizeof (*pt), DRM_MEM_MAGIC);
return (0);
}
}
DRM_UNLOCK();
return (EINVAL);
}
/*ARGSUSED*/
int
drm_getmagic(DRM_IOCTL_ARGS)
{
DRM_DEVICE;
static drm_magic_t sequence = 0;
drm_auth_t auth;
/* Find unique magic */
if (fpriv->magic) {
auth.magic = fpriv->magic;
} else {
do {
int old = sequence;
auth.magic = old+1;
if (!atomic_cmpset_int(&sequence, old, auth.magic))
continue;
} while (drm_find_file(dev, auth.magic));
fpriv->magic = auth.magic;
(void) drm_add_magic(dev, fpriv, auth.magic);
}
DRM_DEBUG("drm_getmagic: %u", auth.magic);
DRM_COPYTO_WITH_RETURN((void *)data, &auth, sizeof (auth));
return (0);
}
/*ARGSUSED*/
int
drm_authmagic(DRM_IOCTL_ARGS)
{
drm_auth_t auth;
drm_file_t *file;
DRM_DEVICE;
DRM_COPYFROM_WITH_RETURN(&auth, (void *)data, sizeof (auth));
if ((file = drm_find_file(dev, auth.magic))) {
file->authenticated = 1;
(void) drm_remove_magic(dev, auth.magic);
return (0);
}
return (EINVAL);
}