1/*-
2 * Copyright 1999 Precision Insight, Inc., Cedar Park, Texas.
3 * Copyright 2000 VA Linux Systems, Inc., Sunnyvale, California.
4 * All Rights Reserved.
5 *
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:
12 *
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
15 * Software.
16 *
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.
24 *
25 * Authors:
26 * Rickard E. (Rik) Faith <faith@valinux.com>
27 * Gareth Hughes <gareth@valinux.com>
28 *
29 */
30
31#include <sys/cdefs.h>
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32__FBSDID("$FreeBSD: head/sys/dev/drm/drm_auth.c 183573 2008-10-03 16:59:11Z rnoland $");
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| 32__FBSDID("$FreeBSD: head/sys/dev/drm/drm_auth.c 183833 2008-10-13 18:03:27Z rnoland $"); |
33
34/** @file drm_auth.c
35 * Implementation of the get/authmagic ioctls implementing the authentication
36 * scheme between the master and clients.
37 */
38
39#include "dev/drm/drmP.h"
40
41static int drm_hash_magic(drm_magic_t magic)
42{
43 return magic & (DRM_HASH_SIZE-1);
44}
45
46/**
47 * Returns the file private associated with the given magic number.
48 */
49static struct drm_file *drm_find_file(struct drm_device *dev, drm_magic_t magic)
50{
51 drm_magic_entry_t *pt;
52 int hash = drm_hash_magic(magic);
53
54 DRM_SPINLOCK_ASSERT(&dev->dev_lock);
55
56 for (pt = dev->magiclist[hash].head; pt; pt = pt->next) {
57 if (pt->magic == magic) {
58 return pt->priv;
59 }
60 }
61
62 return NULL;
63}
64
65/**
66 * Inserts the given magic number into the hash table of used magic number
67 * lists.
68 */
69static int drm_add_magic(struct drm_device *dev, struct drm_file *priv,
70 drm_magic_t magic)
71{
72 int hash;
73 drm_magic_entry_t *entry;
74
75 DRM_DEBUG("%d\n", magic);
76
77 DRM_SPINLOCK_ASSERT(&dev->dev_lock);
78
79 hash = drm_hash_magic(magic);
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80 entry = malloc(sizeof(*entry), M_DRM, M_ZERO | M_NOWAIT);
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| 80 entry = malloc(sizeof(*entry), DRM_MEM_MAGIC, M_ZERO | M_NOWAIT); |
81 if (!entry)
82 return ENOMEM;
83 entry->magic = magic;
84 entry->priv = priv;
85 entry->next = NULL;
86
87 if (dev->magiclist[hash].tail) {
88 dev->magiclist[hash].tail->next = entry;
89 dev->magiclist[hash].tail = entry;
90 } else {
91 dev->magiclist[hash].head = entry;
92 dev->magiclist[hash].tail = entry;
93 }
94
95 return 0;
96}
97
98/**
99 * Removes the given magic number from the hash table of used magic number
100 * lists.
101 */
102static int drm_remove_magic(struct drm_device *dev, drm_magic_t magic)
103{
104 drm_magic_entry_t *prev = NULL;
105 drm_magic_entry_t *pt;
106 int hash;
107
108 DRM_SPINLOCK_ASSERT(&dev->dev_lock);
109
110 DRM_DEBUG("%d\n", magic);
111 hash = drm_hash_magic(magic);
112
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;
117 }
118 if (dev->magiclist[hash].tail == pt) {
119 dev->magiclist[hash].tail = prev;
120 }
121 if (prev) {
122 prev->next = pt->next;
123 }
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124 free(pt, M_DRM);
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| 124 free(pt, DRM_MEM_MAGIC); |
125 return 0;
126 }
127 }
128
129 return EINVAL;
130}
131
132/**
133 * Called by the client, this returns a unique magic number to be authorized
134 * by the master.
135 *
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.
139 */
140int drm_getmagic(struct drm_device *dev, void *data, struct drm_file *file_priv)
141{
142 static drm_magic_t sequence = 0;
143 struct drm_auth *auth = data;
144
145 /* Find unique magic */
146 if (file_priv->magic) {
147 auth->magic = file_priv->magic;
148 } else {
149 DRM_LOCK();
150 do {
151 int old = sequence;
152
153 auth->magic = old+1;
154
155 if (!atomic_cmpset_int(&sequence, old, auth->magic))
156 continue;
157 } while (drm_find_file(dev, auth->magic));
158 file_priv->magic = auth->magic;
159 drm_add_magic(dev, file_priv, auth->magic);
160 DRM_UNLOCK();
161 }
162
163 DRM_DEBUG("%u\n", auth->magic);
164
165 return 0;
166}
167
168/**
169 * Marks the client associated with the given magic number as authenticated.
170 */
171int drm_authmagic(struct drm_device *dev, void *data,
172 struct drm_file *file_priv)
173{
174 struct drm_auth *auth = data;
175 struct drm_file *priv;
176
177 DRM_DEBUG("%u\n", auth->magic);
178
179 DRM_LOCK();
180 priv = drm_find_file(dev, auth->magic);
181 if (priv != NULL) {
182 priv->authenticated = 1;
183 drm_remove_magic(dev, auth->magic);
184 DRM_UNLOCK();
185 return 0;
186 } else {
187 DRM_UNLOCK();
188 return EINVAL;
189 }
190}
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