drm_auth.c

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    1 /* drm_auth.h -- IOCTLs for authentication -*- linux-c -*-
    2  * Created: Tue Feb  2 08:37:54 1999 by faith@valinux.com
    3  */
    4 /*-
    5  * Copyright 1999 Precision Insight, Inc., Cedar Park, Texas.
    6  * Copyright 2000 VA Linux Systems, Inc., Sunnyvale, California.
    7  * All Rights Reserved.
    8  *
    9  * Permission is hereby granted, free of charge, to any person obtaining a
   10  * copy of this software and associated documentation files (the "Software"),
   11  * to deal in the Software without restriction, including without limitation
   12  * the rights to use, copy, modify, merge, publish, distribute, sublicense,
   13  * and/or sell copies of the Software, and to permit persons to whom the
   14  * Software is furnished to do so, subject to the following conditions:
   15  *
   16  * The above copyright notice and this permission notice (including the next
   17  * paragraph) shall be included in all copies or substantial portions of the
   18  * Software.
   19  *
   20  * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
   21  * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
   22  * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT.  IN NO EVENT SHALL
   23  * VA LINUX SYSTEMS AND/OR ITS SUPPLIERS BE LIABLE FOR ANY CLAIM, DAMAGES OR
   24  * OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE,
   25  * ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR
   26  * OTHER DEALINGS IN THE SOFTWARE.
   27  *
   28  * Authors:
   29  *    Rickard E. (Rik) Faith <faith@valinux.com>
   30  *    Gareth Hughes <gareth@valinux.com>
   31  *
   32  */
   33 
   34 #include <sys/cdefs.h>
   35 __FBSDID("$FreeBSD: releng/6.4/sys/dev/drm/drm_auth.c 153401 2005-12-14 00:52:59Z anholt $");
   36 
   37 #include "dev/drm/drmP.h"
   38 
   39 static int drm_hash_magic(drm_magic_t magic)
   40 {
   41         return magic & (DRM_HASH_SIZE-1);
   42 }
   43 
   44 static drm_file_t *drm_find_file(drm_device_t *dev, drm_magic_t magic)
   45 {
   46         drm_file_t        *retval = NULL;
   47         drm_magic_entry_t *pt;
   48         int               hash;
   49 
   50         hash = drm_hash_magic(magic);
   51 
   52         DRM_LOCK();
   53         for (pt = dev->magiclist[hash].head; pt; pt = pt->next) {
   54                 if (pt->magic == magic) {
   55                         retval = pt->priv;
   56                         break;
   57                 }
   58         }
   59         DRM_UNLOCK();
   60         return retval;
   61 }
   62 
   63 static int drm_add_magic(drm_device_t *dev, drm_file_t *priv, drm_magic_t magic)
   64 {
   65         int               hash;
   66         drm_magic_entry_t *entry;
   67 
   68         DRM_DEBUG("%d\n", magic);
   69 
   70         hash = drm_hash_magic(magic);
   71         entry = malloc(sizeof(*entry), M_DRM, M_ZERO | M_NOWAIT);
   72         if (!entry) return DRM_ERR(ENOMEM);
   73         entry->magic = magic;
   74         entry->priv  = priv;
   75         entry->next  = NULL;
   76 
   77         DRM_LOCK();
   78         if (dev->magiclist[hash].tail) {
   79                 dev->magiclist[hash].tail->next = entry;
   80                 dev->magiclist[hash].tail       = entry;
   81         } else {
   82                 dev->magiclist[hash].head       = entry;
   83                 dev->magiclist[hash].tail       = entry;
   84         }
   85         DRM_UNLOCK();
   86 
   87         return 0;
   88 }
   89 
   90 static int drm_remove_magic(drm_device_t *dev, drm_magic_t magic)
   91 {
   92         drm_magic_entry_t *prev = NULL;
   93         drm_magic_entry_t *pt;
   94         int               hash;
   95 
   96         DRM_DEBUG("%d\n", magic);
   97         hash = drm_hash_magic(magic);
   98 
   99         DRM_LOCK();
  100         for (pt = dev->magiclist[hash].head; pt; prev = pt, pt = pt->next) {
  101                 if (pt->magic == magic) {
  102                         if (dev->magiclist[hash].head == pt) {
  103                                 dev->magiclist[hash].head = pt->next;
  104                         }
  105                         if (dev->magiclist[hash].tail == pt) {
  106                                 dev->magiclist[hash].tail = prev;
  107                         }
  108                         if (prev) {
  109                                 prev->next = pt->next;
  110                         }
  111                         DRM_UNLOCK();
  112                         return 0;
  113                 }
  114         }
  115         DRM_UNLOCK();
  116 
  117         free(pt, M_DRM);
  118         return DRM_ERR(EINVAL);
  119 }
  120 
  121 int drm_getmagic(DRM_IOCTL_ARGS)
  122 {
  123         DRM_DEVICE;
  124         static drm_magic_t sequence = 0;
  125         drm_auth_t auth;
  126         drm_file_t *priv;
  127 
  128         DRM_LOCK();
  129         priv = drm_find_file_by_proc(dev, p);
  130         DRM_UNLOCK();
  131         if (priv == NULL) {
  132                 DRM_ERROR("can't find authenticator\n");
  133                 return EINVAL;
  134         }
  135 
  136                                 /* Find unique magic */
  137         if (priv->magic) {
  138                 auth.magic = priv->magic;
  139         } else {
  140                 do {
  141                         int old = sequence;
  142                         
  143                         auth.magic = old+1;
  144                         
  145                         if (!atomic_cmpset_int(&sequence, old, auth.magic))
  146                                 continue;
  147                 } while (drm_find_file(dev, auth.magic));
  148                 priv->magic = auth.magic;
  149                 drm_add_magic(dev, priv, auth.magic);
  150         }
  151 
  152         DRM_DEBUG("%u\n", auth.magic);
  153 
  154         DRM_COPY_TO_USER_IOCTL((drm_auth_t *)data, auth, sizeof(auth));
  155 
  156         return 0;
  157 }
  158 
  159 int drm_authmagic(DRM_IOCTL_ARGS)
  160 {
  161         drm_auth_t         auth;
  162         drm_file_t         *file;
  163         DRM_DEVICE;
  164 
  165         DRM_COPY_FROM_USER_IOCTL(auth, (drm_auth_t *)data, sizeof(auth));
  166 
  167         DRM_DEBUG("%u\n", auth.magic);
  168 
  169         if ((file = drm_find_file(dev, auth.magic))) {
  170                 file->authenticated = 1;
  171                 drm_remove_magic(dev, auth.magic);
  172                 return 0;
  173         }
  174         return DRM_ERR(EINVAL);
  175 }

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FreeBSD/Linux Kernel Cross Reference sys/dev/drm/drm_auth.c

FreeBSD/Linux Kernel Cross Reference
sys/dev/drm/drm_auth.c