1 /* 2 * Copyright 2006 Sun Microsystems, Inc. All rights reserved. 3 * Use is subject to license terms. 4 */ 5 6 /* 7 * drm_auth.h -- IOCTLs for authentication -*- linux-c -*- 8 * Created: Tue Feb 2 08:37:54 1999 by faith@valinux.com 9 */ 10 /* 11 * Copyright 1999 Precision Insight, Inc., Cedar Park, Texas. 12 * Copyright 2000 VA Linux Systems, Inc., Sunnyvale, California. 13 * All Rights Reserved. 14 * 15 * Permission is hereby granted, free of charge, to any person obtaining a 16 * copy of this software and associated documentation files (the "Software"), 17 * to deal in the Software without restriction, including without limitation 18 * the rights to use, copy, modify, merge, publish, distribute, sublicense, 19 * and/or sell copies of the Software, and to permit persons to whom the 20 * Software is furnished to do so, subject to the following conditions: 21 * 22 * The above copyright notice and this permission notice (including the next 23 * paragraph) shall be included in all copies or substantial portions of the 24 * Software. 25 * 26 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR 27 * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, 28 * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL 29 * VA LINUX SYSTEMS AND/OR ITS SUPPLIERS BE LIABLE FOR ANY CLAIM, DAMAGES OR 30 * OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, 31 * ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR 32 * OTHER DEALINGS IN THE SOFTWARE. 33 * 34 * Authors: 35 * Rickard E. (Rik) Faith <faith@valinux.com> 36 * Gareth Hughes <gareth@valinux.com> 37 * 38 */ 39 40 #pragma ident "%Z%%M% %I% %E% SMI" 41 42 #include "drmP.h" 43 44 static int 45 drm_hash_magic(drm_magic_t magic) 46 { 47 return (magic & (DRM_HASH_SIZE-1)); 48 } 49 50 drm_file_t * 51 drm_find_file(drm_device_t *dev, drm_magic_t magic) 52 { 53 drm_file_t *retval = NULL; 54 drm_magic_entry_t *pt; 55 int hash; 56 57 hash = drm_hash_magic(magic); 58 59 DRM_LOCK(); 60 for (pt = dev->magiclist[hash].head; pt; pt = pt->next) { 61 if (pt->magic == magic) { 62 retval = pt->priv; 63 break; 64 } 65 } 66 DRM_UNLOCK(); 67 return (retval); 68 } 69 70 static int 71 drm_add_magic(drm_device_t *dev, drm_file_t *priv, drm_magic_t magic) 72 { 73 int hash; 74 drm_magic_entry_t *entry; 75 76 DRM_DEBUG("drm_add_magic: %d", magic); 77 78 hash = drm_hash_magic(magic); 79 entry = drm_alloc(sizeof (*entry), DRM_MEM_MAGIC); 80 if (!entry) 81 return (DRM_ERR(ENOMEM)); 82 entry->magic = magic; 83 entry->priv = priv; 84 entry->next = NULL; 85 86 DRM_LOCK(); 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 DRM_UNLOCK(); 95 96 return (0); 97 } 98 99 int 100 drm_remove_magic(drm_device_t *dev, drm_magic_t magic) 101 { 102 drm_magic_entry_t *prev = NULL; 103 drm_magic_entry_t *pt; 104 int hash; 105 106 DRM_DEBUG("drm_remove_magic : %d", magic); 107 hash = drm_hash_magic(magic); 108 109 DRM_LOCK(); 110 for (pt = dev->magiclist[hash].head; pt; prev = pt, pt = pt->next) { 111 if (pt->magic == magic) { 112 if (dev->magiclist[hash].head == pt) { 113 dev->magiclist[hash].head = pt->next; 114 } 115 if (dev->magiclist[hash].tail == pt) { 116 dev->magiclist[hash].tail = prev; 117 } 118 if (prev) { 119 prev->next = pt->next; 120 } 121 DRM_UNLOCK(); 122 drm_free(pt, sizeof (*pt), DRM_MEM_MAGIC); 123 return (0); 124 } 125 } 126 DRM_UNLOCK(); 127 128 return (DRM_ERR(EINVAL)); 129 } 130 131 /*ARGSUSED*/ 132 int 133 drm_getmagic(DRM_IOCTL_ARGS) 134 { 135 DRM_DEVICE; 136 static drm_magic_t sequence = 0; 137 drm_auth_t auth; 138 drm_file_t *priv; 139 140 DRM_LOCK(); 141 priv = drm_find_file_by_proc(dev, credp); 142 DRM_UNLOCK(); 143 if (priv == NULL) { 144 DRM_ERROR("drm_getmagic: can't find authenticator"); 145 return (DRM_ERR(EINVAL)); 146 } 147 148 /* Find unique magic */ 149 if (priv->magic) { 150 auth.magic = priv->magic; 151 } else { 152 do { 153 int old = sequence; 154 auth.magic = old+1; 155 if (!atomic_cmpset_int(&sequence, old, auth.magic)) 156 continue; 157 } while (drm_find_file(dev, auth.magic)); 158 priv->magic = auth.magic; 159 (void) drm_add_magic(dev, priv, auth.magic); 160 } 161 162 DRM_DEBUG("drm_getmagic: %u", auth.magic); 163 164 DRM_COPY_TO_USER_IOCTL((drm_auth_t *)data, auth, sizeof (auth)); 165 166 return (0); 167 } 168 169 /*ARGSUSED*/ 170 int 171 drm_authmagic(DRM_IOCTL_ARGS) 172 { 173 drm_auth_t auth; 174 drm_file_t *file; 175 DRM_DEVICE; 176 177 DRM_COPY_FROM_USER_IOCTL(auth, (drm_auth_t *)data, sizeof (auth)); 178 179 DRM_DEBUG("drm_authmagic %u", auth.magic); 180 181 if ((file = drm_find_file(dev, auth.magic))) { 182 file->authenticated = 1; 183 (void) drm_remove_magic(dev, auth.magic); 184 return (0); 185 } 186 return (DRM_ERR(EINVAL)); 187 } 188