Commit | Line | Data |
---|---|---|
1da177e4 | 1 | /** |
b5e89ed5 | 2 | * \file drm_auth.c |
1da177e4 LT |
3 | * IOCTLs for authentication |
4 | * | |
5 | * \author Rickard E. (Rik) Faith <faith@valinux.com> | |
6 | * \author Gareth Hughes <gareth@valinux.com> | |
7 | */ | |
8 | ||
9 | /* | |
10 | * Created: Tue Feb 2 08:37:54 1999 by faith@valinux.com | |
11 | * | |
12 | * Copyright 1999 Precision Insight, Inc., Cedar Park, Texas. | |
13 | * Copyright 2000 VA Linux Systems, Inc., Sunnyvale, California. | |
14 | * All Rights Reserved. | |
15 | * | |
16 | * Permission is hereby granted, free of charge, to any person obtaining a | |
17 | * copy of this software and associated documentation files (the "Software"), | |
18 | * to deal in the Software without restriction, including without limitation | |
19 | * the rights to use, copy, modify, merge, publish, distribute, sublicense, | |
20 | * and/or sell copies of the Software, and to permit persons to whom the | |
21 | * Software is furnished to do so, subject to the following conditions: | |
22 | * | |
23 | * The above copyright notice and this permission notice (including the next | |
24 | * paragraph) shall be included in all copies or substantial portions of the | |
25 | * Software. | |
26 | * | |
27 | * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR | |
28 | * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, | |
29 | * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL | |
30 | * VA LINUX SYSTEMS AND/OR ITS SUPPLIERS BE LIABLE FOR ANY CLAIM, DAMAGES OR | |
31 | * OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, | |
32 | * ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR | |
33 | * OTHER DEALINGS IN THE SOFTWARE. | |
34 | */ | |
35 | ||
36 | #include "drmP.h" | |
37 | ||
1da177e4 LT |
38 | /** |
39 | * Find the file with the given magic number. | |
40 | * | |
41 | * \param dev DRM device. | |
42 | * \param magic magic number. | |
43 | * | |
44 | * Searches in drm_device::magiclist within all files with the same hash key | |
30e2fb18 | 45 | * the one with matching magic number, while holding the drm_device::struct_mutex |
1da177e4 LT |
46 | * lock. |
47 | */ | |
b5e89ed5 | 48 | static drm_file_t *drm_find_file(drm_device_t * dev, drm_magic_t magic) |
1da177e4 | 49 | { |
b5e89ed5 | 50 | drm_file_t *retval = NULL; |
1da177e4 | 51 | drm_magic_entry_t *pt; |
8669cbc5 | 52 | drm_hash_item_t *hash; |
1da177e4 | 53 | |
30e2fb18 | 54 | mutex_lock(&dev->struct_mutex); |
8669cbc5 TH |
55 | if (!drm_ht_find_item(&dev->magiclist, (unsigned long)magic, &hash)) { |
56 | pt = drm_hash_entry(hash, drm_magic_entry_t, hash_item); | |
57 | retval = pt->priv; | |
1da177e4 | 58 | } |
30e2fb18 | 59 | mutex_unlock(&dev->struct_mutex); |
1da177e4 LT |
60 | return retval; |
61 | } | |
62 | ||
63 | /** | |
64 | * Adds a magic number. | |
b5e89ed5 | 65 | * |
1da177e4 LT |
66 | * \param dev DRM device. |
67 | * \param priv file private data. | |
68 | * \param magic magic number. | |
69 | * | |
70 | * Creates a drm_magic_entry structure and appends to the linked list | |
71 | * associated the magic number hash key in drm_device::magiclist, while holding | |
30e2fb18 | 72 | * the drm_device::struct_mutex lock. |
1da177e4 | 73 | */ |
b5e89ed5 DA |
74 | static int drm_add_magic(drm_device_t * dev, drm_file_t * priv, |
75 | drm_magic_t magic) | |
1da177e4 | 76 | { |
1da177e4 LT |
77 | drm_magic_entry_t *entry; |
78 | ||
79 | DRM_DEBUG("%d\n", magic); | |
80 | ||
b5e89ed5 DA |
81 | entry = drm_alloc(sizeof(*entry), DRM_MEM_MAGIC); |
82 | if (!entry) | |
83 | return -ENOMEM; | |
1da177e4 | 84 | memset(entry, 0, sizeof(*entry)); |
b5e89ed5 | 85 | entry->priv = priv; |
1da177e4 | 86 | |
8669cbc5 | 87 | entry->hash_item.key = (unsigned long)magic; |
30e2fb18 | 88 | mutex_lock(&dev->struct_mutex); |
8669cbc5 TH |
89 | drm_ht_insert_item(&dev->magiclist, &entry->hash_item); |
90 | list_add_tail(&entry->head, &dev->magicfree); | |
30e2fb18 | 91 | mutex_unlock(&dev->struct_mutex); |
1da177e4 LT |
92 | |
93 | return 0; | |
94 | } | |
95 | ||
96 | /** | |
97 | * Remove a magic number. | |
b5e89ed5 | 98 | * |
1da177e4 LT |
99 | * \param dev DRM device. |
100 | * \param magic magic number. | |
101 | * | |
102 | * Searches and unlinks the entry in drm_device::magiclist with the magic | |
30e2fb18 | 103 | * number hash key, while holding the drm_device::struct_mutex lock. |
1da177e4 | 104 | */ |
b5e89ed5 | 105 | static int drm_remove_magic(drm_device_t * dev, drm_magic_t magic) |
1da177e4 | 106 | { |
1da177e4 | 107 | drm_magic_entry_t *pt; |
8669cbc5 | 108 | drm_hash_item_t *hash; |
1da177e4 LT |
109 | |
110 | DRM_DEBUG("%d\n", magic); | |
1da177e4 | 111 | |
30e2fb18 | 112 | mutex_lock(&dev->struct_mutex); |
8669cbc5 TH |
113 | if (drm_ht_find_item(&dev->magiclist, (unsigned long)magic, &hash)) { |
114 | mutex_unlock(&dev->struct_mutex); | |
115 | return -EINVAL; | |
1da177e4 | 116 | } |
8669cbc5 TH |
117 | pt = drm_hash_entry(hash, drm_magic_entry_t, hash_item); |
118 | drm_ht_remove_item(&dev->magiclist, hash); | |
119 | list_del(&pt->head); | |
30e2fb18 | 120 | mutex_unlock(&dev->struct_mutex); |
1da177e4 LT |
121 | |
122 | drm_free(pt, sizeof(*pt), DRM_MEM_MAGIC); | |
123 | ||
572225be | 124 | return 0; |
1da177e4 LT |
125 | } |
126 | ||
127 | /** | |
128 | * Get a unique magic number (ioctl). | |
129 | * | |
130 | * \param inode device inode. | |
131 | * \param filp file pointer. | |
132 | * \param cmd command. | |
133 | * \param arg pointer to a resulting drm_auth structure. | |
134 | * \return zero on success, or a negative number on failure. | |
135 | * | |
136 | * If there is a magic number in drm_file::magic then use it, otherwise | |
137 | * searches an unique non-zero magic number and add it associating it with \p | |
138 | * filp. | |
139 | */ | |
140 | int drm_getmagic(struct inode *inode, struct file *filp, | |
b5e89ed5 | 141 | unsigned int cmd, unsigned long arg) |
1da177e4 LT |
142 | { |
143 | static drm_magic_t sequence = 0; | |
144 | static DEFINE_SPINLOCK(lock); | |
b5e89ed5 DA |
145 | drm_file_t *priv = filp->private_data; |
146 | drm_device_t *dev = priv->head->dev; | |
c60ce623 | 147 | struct drm_auth auth; |
1da177e4 | 148 | |
b5e89ed5 | 149 | /* Find unique magic */ |
1da177e4 LT |
150 | if (priv->magic) { |
151 | auth.magic = priv->magic; | |
152 | } else { | |
153 | do { | |
154 | spin_lock(&lock); | |
b5e89ed5 DA |
155 | if (!sequence) |
156 | ++sequence; /* reserve 0 */ | |
1da177e4 LT |
157 | auth.magic = sequence++; |
158 | spin_unlock(&lock); | |
159 | } while (drm_find_file(dev, auth.magic)); | |
160 | priv->magic = auth.magic; | |
161 | drm_add_magic(dev, priv, auth.magic); | |
162 | } | |
163 | ||
164 | DRM_DEBUG("%u\n", auth.magic); | |
c60ce623 | 165 | if (copy_to_user((struct drm_auth __user *) arg, &auth, sizeof(auth))) |
1da177e4 LT |
166 | return -EFAULT; |
167 | return 0; | |
168 | } | |
169 | ||
170 | /** | |
171 | * Authenticate with a magic. | |
172 | * | |
173 | * \param inode device inode. | |
174 | * \param filp file pointer. | |
175 | * \param cmd command. | |
176 | * \param arg pointer to a drm_auth structure. | |
177 | * \return zero if authentication successed, or a negative number otherwise. | |
178 | * | |
179 | * Checks if \p filp is associated with the magic number passed in \arg. | |
180 | */ | |
181 | int drm_authmagic(struct inode *inode, struct file *filp, | |
b5e89ed5 | 182 | unsigned int cmd, unsigned long arg) |
1da177e4 | 183 | { |
b5e89ed5 DA |
184 | drm_file_t *priv = filp->private_data; |
185 | drm_device_t *dev = priv->head->dev; | |
c60ce623 | 186 | struct drm_auth auth; |
b5e89ed5 | 187 | drm_file_t *file; |
1da177e4 | 188 | |
c60ce623 | 189 | if (copy_from_user(&auth, (struct drm_auth __user *) arg, sizeof(auth))) |
1da177e4 LT |
190 | return -EFAULT; |
191 | DRM_DEBUG("%u\n", auth.magic); | |
192 | if ((file = drm_find_file(dev, auth.magic))) { | |
193 | file->authenticated = 1; | |
194 | drm_remove_magic(dev, auth.magic); | |
195 | return 0; | |
196 | } | |
197 | return -EINVAL; | |
198 | } |