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 /** @file drm_auth.c 32 * Implementation of the get/authmagic ioctls implementing the authentication 33 * scheme between the master and clients. 34 */ 35 36 #include "drmP.h" 37 38 /** 39 * Called by the client, this returns a unique magic number to be authorized 40 * by the master. 41 * 42 * The master may use its own knowledge of the client (such as the X 43 * connection that the magic is passed over) to determine if the magic number 44 * should be authenticated. 45 */ 46 int 47 drm_getmagic(struct drm_device *dev, void *data, struct drm_file *file_priv) 48 { 49 struct drm_auth *auth = data; 50 struct drm_magic_entry *entry; 51 52 /* Find unique magic */ 53 if (file_priv->magic) { 54 auth->magic = file_priv->magic; 55 } else { 56 entry = drm_alloc(sizeof(*entry), DRM_MEM_MAGIC); 57 if (entry == NULL) 58 return (ENOMEM); 59 DRM_LOCK(); 60 entry->magic = file_priv->magic = auth->magic = dev->magicid++; 61 entry->priv = file_priv; 62 SPLAY_INSERT(drm_magic_tree, &dev->magiclist, entry); 63 64 DRM_UNLOCK(); 65 DRM_DEBUG("%d\n", auth->magic); 66 } 67 68 DRM_DEBUG("%u\n", auth->magic); 69 70 return (0); 71 } 72 73 /** 74 * Marks the client associated with the given magic number as authenticated. 75 */ 76 int 77 drm_authmagic(struct drm_device *dev, void *data, struct drm_file *file_priv) 78 { 79 struct drm_auth *auth = data; 80 struct drm_magic_entry *pt, key; 81 82 DRM_DEBUG("%u\n", auth->magic); 83 84 key.magic = auth->magic; 85 DRM_LOCK(); 86 if ((pt = SPLAY_FIND(drm_magic_tree, &dev->magiclist, &key)) == NULL || 87 pt->priv == NULL) { 88 DRM_UNLOCK(); 89 return (EINVAL); 90 } 91 92 pt->priv->authenticated = 1; 93 SPLAY_REMOVE(drm_magic_tree, &dev->magiclist, pt); 94 DRM_UNLOCK(); 95 96 drm_free(pt, sizeof(*pt), DRM_MEM_MAGIC); 97 98 return (0); 99 } 100 101 int 102 drm_magic_cmp(struct drm_magic_entry *dme1, struct drm_magic_entry *dme2) 103 { 104 return (dme1->magic - dme2->magic); 105 } 106 107 SPLAY_GENERATE(drm_magic_tree, drm_magic_entry, node, drm_magic_cmp); 108