2 * Copyright 1999 Precision Insight, Inc., Cedar Park, Texas.
3 * Copyright 2000 VA Linux Systems, Inc., Sunnyvale, California.
6 * Permission is hereby granted, free of charge, to any person obtaining a
7 * copy of this software and associated documentation files (the "Software"),
8 * to deal in the Software without restriction, including without limitation
9 * the rights to use, copy, modify, merge, publish, distribute, sublicense,
10 * and/or sell copies of the Software, and to permit persons to whom the
11 * Software is furnished to do so, subject to the following conditions:
13 * The above copyright notice and this permission notice (including the next
14 * paragraph) shall be included in all copies or substantial portions of the
17 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
18 * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
19 * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL
20 * VA LINUX SYSTEMS AND/OR ITS SUPPLIERS BE LIABLE FOR ANY CLAIM, DAMAGES OR
21 * OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE,
22 * ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR
23 * OTHER DEALINGS IN THE SOFTWARE.
26 * Rickard E. (Rik) Faith <faith@valinux.com>
27 * Gareth Hughes <gareth@valinux.com>
31 #include <sys/cdefs.h>
32 __FBSDID("$FreeBSD$");
35 * Implementation of the get/authmagic ioctls implementing the authentication
36 * scheme between the master and clients.
39 #include "dev/drm/drmP.h"
41 static int drm_hash_magic(drm_magic_t magic)
43 return magic & (DRM_HASH_SIZE-1);
47 * Returns the file private associated with the given magic number.
49 static struct drm_file *drm_find_file(struct drm_device *dev, drm_magic_t magic)
51 drm_magic_entry_t *pt;
52 int hash = drm_hash_magic(magic);
54 DRM_SPINLOCK_ASSERT(&dev->dev_lock);
56 for (pt = dev->magiclist[hash].head; pt; pt = pt->next) {
57 if (pt->magic == magic) {
66 * Inserts the given magic number into the hash table of used magic number
69 static int drm_add_magic(struct drm_device *dev, struct drm_file *priv,
73 drm_magic_entry_t *entry;
75 DRM_DEBUG("%d\n", magic);
77 DRM_SPINLOCK_ASSERT(&dev->dev_lock);
79 hash = drm_hash_magic(magic);
80 entry = malloc(sizeof(*entry), DRM_MEM_MAGIC, M_ZERO | M_NOWAIT);
87 if (dev->magiclist[hash].tail) {
88 dev->magiclist[hash].tail->next = entry;
89 dev->magiclist[hash].tail = entry;
91 dev->magiclist[hash].head = entry;
92 dev->magiclist[hash].tail = entry;
99 * Removes the given magic number from the hash table of used magic number
102 static int drm_remove_magic(struct drm_device *dev, drm_magic_t magic)
104 drm_magic_entry_t *prev = NULL;
105 drm_magic_entry_t *pt;
108 DRM_SPINLOCK_ASSERT(&dev->dev_lock);
110 DRM_DEBUG("%d\n", magic);
111 hash = drm_hash_magic(magic);
113 for (pt = dev->magiclist[hash].head; pt; prev = pt, pt = pt->next) {
114 if (pt->magic == magic) {
115 if (dev->magiclist[hash].head == pt) {
116 dev->magiclist[hash].head = pt->next;
118 if (dev->magiclist[hash].tail == pt) {
119 dev->magiclist[hash].tail = prev;
122 prev->next = pt->next;
124 free(pt, DRM_MEM_MAGIC);
133 * Called by the client, this returns a unique magic number to be authorized
136 * The master may use its own knowledge of the client (such as the X
137 * connection that the magic is passed over) to determine if the magic number
138 * should be authenticated.
140 int drm_getmagic(struct drm_device *dev, void *data, struct drm_file *file_priv)
142 static drm_magic_t sequence = 0;
143 struct drm_auth *auth = data;
145 /* Find unique magic */
146 if (file_priv->magic) {
147 auth->magic = file_priv->magic;
155 if (!atomic_cmpset_int(&sequence, old, auth->magic))
157 } while (drm_find_file(dev, auth->magic));
158 file_priv->magic = auth->magic;
159 drm_add_magic(dev, file_priv, auth->magic);
163 DRM_DEBUG("%u\n", auth->magic);
169 * Marks the client associated with the given magic number as authenticated.
171 int drm_authmagic(struct drm_device *dev, void *data,
172 struct drm_file *file_priv)
174 struct drm_auth *auth = data;
175 struct drm_file *priv;
177 DRM_DEBUG("%u\n", auth->magic);
180 priv = drm_find_file(dev, auth->magic);
182 priv->authenticated = 1;
183 drm_remove_magic(dev, auth->magic);