166 lines
4.1 KiB
C
166 lines
4.1 KiB
C
/* drm_auth.h -- IOCTLs for authentication -*- linux-c -*-
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* Created: Tue Feb 2 08:37:54 1999 by faith@valinux.com */
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/*-
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* Copyright 1999 Precision Insight, Inc., Cedar Park, Texas.
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* Copyright 2000 VA Linux Systems, Inc., Sunnyvale, California.
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* All Rights Reserved.
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*
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* Permission is hereby granted, free of charge, to any person obtaining a
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* copy of this software and associated documentation files (the "Software"),
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* to deal in the Software without restriction, including without limitation
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* the rights to use, copy, modify, merge, publish, distribute, sublicense,
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* and/or sell copies of the Software, and to permit persons to whom the
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* Software is furnished to do so, subject to the following conditions:
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*
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* The above copyright notice and this permission notice (including the next
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* paragraph) shall be included in all copies or substantial portions of the
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* Software.
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*
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* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
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* IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
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* FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL
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* VA LINUX SYSTEMS AND/OR ITS SUPPLIERS BE LIABLE FOR ANY CLAIM, DAMAGES OR
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* OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE,
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* ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR
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* OTHER DEALINGS IN THE SOFTWARE.
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*
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* Authors:
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* Rickard E. (Rik) Faith <faith@valinux.com>
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* Gareth Hughes <gareth@valinux.com>
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*
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* $FreeBSD$
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*/
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#include "dev/drm/drmP.h"
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static int DRM(hash_magic)(drm_magic_t magic)
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{
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return magic & (DRM_HASH_SIZE-1);
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}
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static drm_file_t *DRM(find_file)(drm_device_t *dev, drm_magic_t magic)
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{
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drm_file_t *retval = NULL;
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drm_magic_entry_t *pt;
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int hash = DRM(hash_magic)(magic);
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DRM_LOCK();
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for (pt = dev->magiclist[hash].head; pt; pt = pt->next) {
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if (pt->magic == magic) {
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retval = pt->priv;
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break;
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}
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}
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DRM_UNLOCK();
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return retval;
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}
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static int DRM(add_magic)(drm_device_t *dev, drm_file_t *priv, drm_magic_t magic)
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{
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int hash;
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drm_magic_entry_t *entry;
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DRM_DEBUG("%d\n", magic);
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hash = DRM(hash_magic)(magic);
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entry = (drm_magic_entry_t*) DRM(alloc)(sizeof(*entry), DRM_MEM_MAGIC);
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if (!entry) return DRM_ERR(ENOMEM);
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memset(entry, 0, sizeof(*entry));
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entry->magic = magic;
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entry->priv = priv;
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entry->next = NULL;
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DRM_LOCK();
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if (dev->magiclist[hash].tail) {
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dev->magiclist[hash].tail->next = entry;
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dev->magiclist[hash].tail = entry;
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} else {
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dev->magiclist[hash].head = entry;
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dev->magiclist[hash].tail = entry;
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}
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DRM_UNLOCK();
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return 0;
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}
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static int DRM(remove_magic)(drm_device_t *dev, drm_magic_t magic)
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{
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drm_magic_entry_t *prev = NULL;
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drm_magic_entry_t *pt;
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int hash;
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DRM_DEBUG("%d\n", magic);
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hash = DRM(hash_magic)(magic);
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DRM_LOCK();
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for (pt = dev->magiclist[hash].head; pt; prev = pt, pt = pt->next) {
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if (pt->magic == magic) {
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if (dev->magiclist[hash].head == pt) {
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dev->magiclist[hash].head = pt->next;
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}
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if (dev->magiclist[hash].tail == pt) {
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dev->magiclist[hash].tail = prev;
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}
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if (prev) {
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prev->next = pt->next;
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}
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DRM_UNLOCK();
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return 0;
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}
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}
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DRM_UNLOCK();
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DRM(free)(pt, sizeof(*pt), DRM_MEM_MAGIC);
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return DRM_ERR(EINVAL);
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}
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int DRM(getmagic)(DRM_IOCTL_ARGS)
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{
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static drm_magic_t sequence = 0;
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drm_auth_t auth;
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drm_file_t *priv;
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DRM_DEVICE;
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DRM_GET_PRIV_WITH_RETURN(priv, filp);
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/* Find unique magic */
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if (priv->magic) {
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auth.magic = priv->magic;
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} else {
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do {
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int old = sequence;
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auth.magic = old+1;
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if (!atomic_cmpset_int(&sequence, old, auth.magic))
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continue;
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} while (DRM(find_file)(dev, auth.magic));
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priv->magic = auth.magic;
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DRM(add_magic)(dev, priv, auth.magic);
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}
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DRM_DEBUG("%u\n", auth.magic);
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DRM_COPY_TO_USER_IOCTL((drm_auth_t *)data, auth, sizeof(auth));
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return 0;
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}
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int DRM(authmagic)(DRM_IOCTL_ARGS)
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{
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drm_auth_t auth;
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drm_file_t *file;
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DRM_DEVICE;
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DRM_COPY_FROM_USER_IOCTL(auth, (drm_auth_t *)data, sizeof(auth));
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DRM_DEBUG("%u\n", auth.magic);
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if ((file = DRM(find_file)(dev, auth.magic))) {
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file->authenticated = 1;
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DRM(remove_magic)(dev, auth.magic);
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return 0;
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}
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return DRM_ERR(EINVAL);
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}
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