io/drm/drm_auth.c

60405de4d8688d96dd05157c28db3ade5c9bc234kz/*
d0538f66491267879b7418b21ad78e3dcc2dcc83cg * Copyright 2008 Sun Microsystems, Inc.  All rights reserved.
60405de4d8688d96dd05157c28db3ade5c9bc234kz * Use is subject to license terms.
60405de4d8688d96dd05157c28db3ade5c9bc234kz */
60405de4d8688d96dd05157c28db3ade5c9bc234kz
60405de4d8688d96dd05157c28db3ade5c9bc234kz/*
60405de4d8688d96dd05157c28db3ade5c9bc234kz * drm_auth.h -- IOCTLs for authentication -*- linux-c -*-
60405de4d8688d96dd05157c28db3ade5c9bc234kz * Created: Tue Feb  2 08:37:54 1999 by faith@valinux.com
60405de4d8688d96dd05157c28db3ade5c9bc234kz */
60405de4d8688d96dd05157c28db3ade5c9bc234kz/*
60405de4d8688d96dd05157c28db3ade5c9bc234kz * Copyright 1999 Precision Insight, Inc., Cedar Park, Texas.
60405de4d8688d96dd05157c28db3ade5c9bc234kz * Copyright 2000 VA Linux Systems, Inc., Sunnyvale, California.
60405de4d8688d96dd05157c28db3ade5c9bc234kz * All Rights Reserved.
60405de4d8688d96dd05157c28db3ade5c9bc234kz *
60405de4d8688d96dd05157c28db3ade5c9bc234kz * Permission is hereby granted, free of charge, to any person obtaining a
60405de4d8688d96dd05157c28db3ade5c9bc234kz * copy of this software and associated documentation files (the "Software"),
60405de4d8688d96dd05157c28db3ade5c9bc234kz * to deal in the Software without restriction, including without limitation
60405de4d8688d96dd05157c28db3ade5c9bc234kz * the rights to use, copy, modify, merge, publish, distribute, sublicense,
60405de4d8688d96dd05157c28db3ade5c9bc234kz * and/or sell copies of the Software, and to permit persons to whom the
60405de4d8688d96dd05157c28db3ade5c9bc234kz * Software is furnished to do so, subject to the following conditions:
60405de4d8688d96dd05157c28db3ade5c9bc234kz *
60405de4d8688d96dd05157c28db3ade5c9bc234kz * The above copyright notice and this permission notice (including the next
60405de4d8688d96dd05157c28db3ade5c9bc234kz * paragraph) shall be included in all copies or substantial portions of the
60405de4d8688d96dd05157c28db3ade5c9bc234kz * Software.
60405de4d8688d96dd05157c28db3ade5c9bc234kz *
60405de4d8688d96dd05157c28db3ade5c9bc234kz * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
60405de4d8688d96dd05157c28db3ade5c9bc234kz * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
60405de4d8688d96dd05157c28db3ade5c9bc234kz * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT.  IN NO EVENT SHALL
60405de4d8688d96dd05157c28db3ade5c9bc234kz * VA LINUX SYSTEMS AND/OR ITS SUPPLIERS BE LIABLE FOR ANY CLAIM, DAMAGES OR
60405de4d8688d96dd05157c28db3ade5c9bc234kz * OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE,
60405de4d8688d96dd05157c28db3ade5c9bc234kz * ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR
60405de4d8688d96dd05157c28db3ade5c9bc234kz * OTHER DEALINGS IN THE SOFTWARE.
60405de4d8688d96dd05157c28db3ade5c9bc234kz *
60405de4d8688d96dd05157c28db3ade5c9bc234kz * Authors:
60405de4d8688d96dd05157c28db3ade5c9bc234kz *    Rickard E. (Rik) Faith <faith@valinux.com>
60405de4d8688d96dd05157c28db3ade5c9bc234kz *    Gareth Hughes <gareth@valinux.com>
60405de4d8688d96dd05157c28db3ade5c9bc234kz *
60405de4d8688d96dd05157c28db3ade5c9bc234kz */
60405de4d8688d96dd05157c28db3ade5c9bc234kz
60405de4d8688d96dd05157c28db3ade5c9bc234kz#pragma ident   "%Z%%M% %I% %E% SMI"
60405de4d8688d96dd05157c28db3ade5c9bc234kz
60405de4d8688d96dd05157c28db3ade5c9bc234kz#include "drmP.h"
60405de4d8688d96dd05157c28db3ade5c9bc234kz
60405de4d8688d96dd05157c28db3ade5c9bc234kzstatic int
60405de4d8688d96dd05157c28db3ade5c9bc234kzdrm_hash_magic(drm_magic_t magic)
60405de4d8688d96dd05157c28db3ade5c9bc234kz{
60405de4d8688d96dd05157c28db3ade5c9bc234kz    return (magic & (DRM_HASH_SIZE-1));
60405de4d8688d96dd05157c28db3ade5c9bc234kz}
60405de4d8688d96dd05157c28db3ade5c9bc234kz
60405de4d8688d96dd05157c28db3ade5c9bc234kzdrm_file_t *
60405de4d8688d96dd05157c28db3ade5c9bc234kzdrm_find_file(drm_device_t *dev, drm_magic_t magic)
60405de4d8688d96dd05157c28db3ade5c9bc234kz{
60405de4d8688d96dd05157c28db3ade5c9bc234kz    drm_file_t    *retval = NULL;
60405de4d8688d96dd05157c28db3ade5c9bc234kz    drm_magic_entry_t *pt;
60405de4d8688d96dd05157c28db3ade5c9bc234kz    int       hash;
60405de4d8688d96dd05157c28db3ade5c9bc234kz
60405de4d8688d96dd05157c28db3ade5c9bc234kz    hash = drm_hash_magic(magic);
60405de4d8688d96dd05157c28db3ade5c9bc234kz    for (pt = dev->magiclist[hash].head; pt; pt = pt->next) {
60405de4d8688d96dd05157c28db3ade5c9bc234kz        if (pt->magic == magic) {
60405de4d8688d96dd05157c28db3ade5c9bc234kz            retval = pt->priv;
60405de4d8688d96dd05157c28db3ade5c9bc234kz            break;
60405de4d8688d96dd05157c28db3ade5c9bc234kz        }
60405de4d8688d96dd05157c28db3ade5c9bc234kz    }
d0538f66491267879b7418b21ad78e3dcc2dcc83cg
60405de4d8688d96dd05157c28db3ade5c9bc234kz    return (retval);
60405de4d8688d96dd05157c28db3ade5c9bc234kz}
60405de4d8688d96dd05157c28db3ade5c9bc234kz
60405de4d8688d96dd05157c28db3ade5c9bc234kzstatic int
60405de4d8688d96dd05157c28db3ade5c9bc234kzdrm_add_magic(drm_device_t *dev, drm_file_t *priv, drm_magic_t magic)
60405de4d8688d96dd05157c28db3ade5c9bc234kz{
60405de4d8688d96dd05157c28db3ade5c9bc234kz    int       hash;
60405de4d8688d96dd05157c28db3ade5c9bc234kz    drm_magic_entry_t *entry;
60405de4d8688d96dd05157c28db3ade5c9bc234kz
60405de4d8688d96dd05157c28db3ade5c9bc234kz    hash = drm_hash_magic(magic);
60405de4d8688d96dd05157c28db3ade5c9bc234kz    entry = drm_alloc(sizeof (*entry), DRM_MEM_MAGIC);
60405de4d8688d96dd05157c28db3ade5c9bc234kz    if (!entry)
d0538f66491267879b7418b21ad78e3dcc2dcc83cg        return (ENOMEM);
60405de4d8688d96dd05157c28db3ade5c9bc234kz    entry->magic = magic;
60405de4d8688d96dd05157c28db3ade5c9bc234kz    entry->priv  = priv;
60405de4d8688d96dd05157c28db3ade5c9bc234kz    entry->next  = NULL;
60405de4d8688d96dd05157c28db3ade5c9bc234kz
60405de4d8688d96dd05157c28db3ade5c9bc234kz    DRM_LOCK();
60405de4d8688d96dd05157c28db3ade5c9bc234kz    if (dev->magiclist[hash].tail) {
60405de4d8688d96dd05157c28db3ade5c9bc234kz        dev->magiclist[hash].tail->next = entry;
60405de4d8688d96dd05157c28db3ade5c9bc234kz        dev->magiclist[hash].tail   = entry;
60405de4d8688d96dd05157c28db3ade5c9bc234kz    } else {
60405de4d8688d96dd05157c28db3ade5c9bc234kz        dev->magiclist[hash].head   = entry;
60405de4d8688d96dd05157c28db3ade5c9bc234kz        dev->magiclist[hash].tail   = entry;
60405de4d8688d96dd05157c28db3ade5c9bc234kz    }
60405de4d8688d96dd05157c28db3ade5c9bc234kz    DRM_UNLOCK();
60405de4d8688d96dd05157c28db3ade5c9bc234kz
60405de4d8688d96dd05157c28db3ade5c9bc234kz    return (0);
60405de4d8688d96dd05157c28db3ade5c9bc234kz}
60405de4d8688d96dd05157c28db3ade5c9bc234kz
60405de4d8688d96dd05157c28db3ade5c9bc234kzint
60405de4d8688d96dd05157c28db3ade5c9bc234kzdrm_remove_magic(drm_device_t *dev, drm_magic_t magic)
60405de4d8688d96dd05157c28db3ade5c9bc234kz{
60405de4d8688d96dd05157c28db3ade5c9bc234kz    drm_magic_entry_t *prev = NULL;
60405de4d8688d96dd05157c28db3ade5c9bc234kz    drm_magic_entry_t *pt;
60405de4d8688d96dd05157c28db3ade5c9bc234kz    int       hash;
60405de4d8688d96dd05157c28db3ade5c9bc234kz
60405de4d8688d96dd05157c28db3ade5c9bc234kz    DRM_DEBUG("drm_remove_magic : %d", magic);
60405de4d8688d96dd05157c28db3ade5c9bc234kz    hash = drm_hash_magic(magic);
60405de4d8688d96dd05157c28db3ade5c9bc234kz
60405de4d8688d96dd05157c28db3ade5c9bc234kz    DRM_LOCK();
60405de4d8688d96dd05157c28db3ade5c9bc234kz    for (pt = dev->magiclist[hash].head; pt; prev = pt, pt = pt->next) {
60405de4d8688d96dd05157c28db3ade5c9bc234kz        if (pt->magic == magic) {
60405de4d8688d96dd05157c28db3ade5c9bc234kz            if (dev->magiclist[hash].head == pt) {
60405de4d8688d96dd05157c28db3ade5c9bc234kz                dev->magiclist[hash].head = pt->next;
60405de4d8688d96dd05157c28db3ade5c9bc234kz            }
60405de4d8688d96dd05157c28db3ade5c9bc234kz            if (dev->magiclist[hash].tail == pt) {
60405de4d8688d96dd05157c28db3ade5c9bc234kz                dev->magiclist[hash].tail = prev;
60405de4d8688d96dd05157c28db3ade5c9bc234kz            }
60405de4d8688d96dd05157c28db3ade5c9bc234kz            if (prev) {
60405de4d8688d96dd05157c28db3ade5c9bc234kz                prev->next = pt->next;
60405de4d8688d96dd05157c28db3ade5c9bc234kz            }
60405de4d8688d96dd05157c28db3ade5c9bc234kz            DRM_UNLOCK();
60405de4d8688d96dd05157c28db3ade5c9bc234kz            drm_free(pt, sizeof (*pt), DRM_MEM_MAGIC);
60405de4d8688d96dd05157c28db3ade5c9bc234kz            return (0);
60405de4d8688d96dd05157c28db3ade5c9bc234kz        }
60405de4d8688d96dd05157c28db3ade5c9bc234kz    }
60405de4d8688d96dd05157c28db3ade5c9bc234kz    DRM_UNLOCK();
60405de4d8688d96dd05157c28db3ade5c9bc234kz
d0538f66491267879b7418b21ad78e3dcc2dcc83cg    return (EINVAL);
60405de4d8688d96dd05157c28db3ade5c9bc234kz}
60405de4d8688d96dd05157c28db3ade5c9bc234kz
60405de4d8688d96dd05157c28db3ade5c9bc234kz/*ARGSUSED*/
60405de4d8688d96dd05157c28db3ade5c9bc234kzint
60405de4d8688d96dd05157c28db3ade5c9bc234kzdrm_getmagic(DRM_IOCTL_ARGS)
60405de4d8688d96dd05157c28db3ade5c9bc234kz{
60405de4d8688d96dd05157c28db3ade5c9bc234kz    DRM_DEVICE;
60405de4d8688d96dd05157c28db3ade5c9bc234kz    static drm_magic_t sequence = 0;
60405de4d8688d96dd05157c28db3ade5c9bc234kz    drm_auth_t auth;
60405de4d8688d96dd05157c28db3ade5c9bc234kz
60405de4d8688d96dd05157c28db3ade5c9bc234kz    /* Find unique magic */
d0538f66491267879b7418b21ad78e3dcc2dcc83cg    if (fpriv->magic) {
d0538f66491267879b7418b21ad78e3dcc2dcc83cg        auth.magic = fpriv->magic;
60405de4d8688d96dd05157c28db3ade5c9bc234kz    } else {
60405de4d8688d96dd05157c28db3ade5c9bc234kz        do {
60405de4d8688d96dd05157c28db3ade5c9bc234kz            int old = sequence;
60405de4d8688d96dd05157c28db3ade5c9bc234kz            auth.magic = old+1;
60405de4d8688d96dd05157c28db3ade5c9bc234kz            if (!atomic_cmpset_int(&sequence, old, auth.magic))
60405de4d8688d96dd05157c28db3ade5c9bc234kz                continue;
60405de4d8688d96dd05157c28db3ade5c9bc234kz        } while (drm_find_file(dev, auth.magic));
d0538f66491267879b7418b21ad78e3dcc2dcc83cg        fpriv->magic = auth.magic;
d0538f66491267879b7418b21ad78e3dcc2dcc83cg        (void) drm_add_magic(dev, fpriv, auth.magic);
60405de4d8688d96dd05157c28db3ade5c9bc234kz    }
60405de4d8688d96dd05157c28db3ade5c9bc234kz
d0538f66491267879b7418b21ad78e3dcc2dcc83cg
60405de4d8688d96dd05157c28db3ade5c9bc234kz    DRM_DEBUG("drm_getmagic: %u", auth.magic);
60405de4d8688d96dd05157c28db3ade5c9bc234kz
d0538f66491267879b7418b21ad78e3dcc2dcc83cg    DRM_COPYTO_WITH_RETURN((void *)data, &auth, sizeof (auth));
60405de4d8688d96dd05157c28db3ade5c9bc234kz
60405de4d8688d96dd05157c28db3ade5c9bc234kz    return (0);
60405de4d8688d96dd05157c28db3ade5c9bc234kz}
60405de4d8688d96dd05157c28db3ade5c9bc234kz
60405de4d8688d96dd05157c28db3ade5c9bc234kz/*ARGSUSED*/
60405de4d8688d96dd05157c28db3ade5c9bc234kzint
60405de4d8688d96dd05157c28db3ade5c9bc234kzdrm_authmagic(DRM_IOCTL_ARGS)
60405de4d8688d96dd05157c28db3ade5c9bc234kz{
60405de4d8688d96dd05157c28db3ade5c9bc234kz    drm_auth_t     auth;
60405de4d8688d96dd05157c28db3ade5c9bc234kz    drm_file_t     *file;
60405de4d8688d96dd05157c28db3ade5c9bc234kz    DRM_DEVICE;
60405de4d8688d96dd05157c28db3ade5c9bc234kz
d0538f66491267879b7418b21ad78e3dcc2dcc83cg    DRM_COPYFROM_WITH_RETURN(&auth, (void *)data, sizeof (auth));
60405de4d8688d96dd05157c28db3ade5c9bc234kz
60405de4d8688d96dd05157c28db3ade5c9bc234kz    if ((file = drm_find_file(dev, auth.magic))) {
60405de4d8688d96dd05157c28db3ade5c9bc234kz        file->authenticated = 1;
60405de4d8688d96dd05157c28db3ade5c9bc234kz        (void) drm_remove_magic(dev, auth.magic);
60405de4d8688d96dd05157c28db3ade5c9bc234kz        return (0);
60405de4d8688d96dd05157c28db3ade5c9bc234kz    }
d0538f66491267879b7418b21ad78e3dcc2dcc83cg    return (EINVAL);
60405de4d8688d96dd05157c28db3ade5c9bc234kz}