1 /* 2 * Copyright 2008 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 for (pt = dev->magiclist[hash].head; pt; pt = pt->next) { 59 if (pt->magic == magic) { 60 retval = pt->priv; 61 break; 62 } 63 } 64 65 return (retval); 66 } 67 68 static int 69 drm_add_magic(drm_device_t *dev, drm_file_t *priv, drm_magic_t magic) 70 { 71 int hash; 72 drm_magic_entry_t *entry; 73 74 hash = drm_hash_magic(magic); 75 entry = drm_alloc(sizeof (*entry), DRM_MEM_MAGIC); 76 if (!entry) 77 return (ENOMEM); 78 entry->magic = magic; 79 entry->priv = priv; 80 entry->next = NULL; 81 82 DRM_LOCK(); 83 if (dev->magiclist[hash].tail) { 84 dev->magiclist[hash].tail->next = entry; 85 dev->magiclist[hash].tail = entry; 86 } else { 87 dev->magiclist[hash].head = entry; 88 dev->magiclist[hash].tail = entry; 89 } 90 DRM_UNLOCK(); 91 92 return (0); 93 } 94 95 int 96 drm_remove_magic(drm_device_t *dev, drm_magic_t magic) 97 { 98 drm_magic_entry_t *prev = NULL; 99 drm_magic_entry_t *pt; 100 int hash; 101 102 DRM_DEBUG("drm_remove_magic : %d", magic); 103 hash = drm_hash_magic(magic); 104 105 DRM_LOCK(); 106 for (pt = dev->magiclist[hash].head; pt; prev = pt, pt = pt->next) { 107 if (pt->magic == magic) { 108 if (dev->magiclist[hash].head == pt) { 109 dev->magiclist[hash].head = pt->next; 110 } 111 if (dev->magiclist[hash].tail == pt) { 112 dev->magiclist[hash].tail = prev; 113 } 114 if (prev) { 115 prev->next = pt->next; 116 } 117 DRM_UNLOCK(); 118 drm_free(pt, sizeof (*pt), DRM_MEM_MAGIC); 119 return (0); 120 } 121 } 122 DRM_UNLOCK(); 123 124 return (EINVAL); 125 } 126 127 /*ARGSUSED*/ 128 int 129 drm_getmagic(DRM_IOCTL_ARGS) 130 { 131 DRM_DEVICE; 132 static drm_magic_t sequence = 0; 133 drm_auth_t auth; 134 135 /* Find unique magic */ 136 if (fpriv->magic) { 137 auth.magic = fpriv->magic; 138 } else { 139 do { 140 int old = sequence; 141 auth.magic = old+1; 142 if (!atomic_cmpset_int(&sequence, old, auth.magic)) 143 continue; 144 } while (drm_find_file(dev, auth.magic)); 145 fpriv->magic = auth.magic; 146 (void) drm_add_magic(dev, fpriv, auth.magic); 147 } 148 149 150 DRM_DEBUG("drm_getmagic: %u", auth.magic); 151 152 DRM_COPYTO_WITH_RETURN((void *)data, &auth, sizeof (auth)); 153 154 return (0); 155 } 156 157 /*ARGSUSED*/ 158 int 159 drm_authmagic(DRM_IOCTL_ARGS) 160 { 161 drm_auth_t auth; 162 drm_file_t *file; 163 DRM_DEVICE; 164 165 DRM_COPYFROM_WITH_RETURN(&auth, (void *)data, sizeof (auth)); 166 167 if ((file = drm_find_file(dev, auth.magic))) { 168 file->authenticated = 1; 169 (void) drm_remove_magic(dev, auth.magic); 170 return (0); 171 } 172 return (EINVAL); 173 } 174