osfmk/kern/host_notify.c

   1 /*
   2  * Copyright (c) 2003-2009 Apple Inc. All rights reserved.
   3  *
   4  * @APPLE_OSREFERENCE_LICENSE_HEADER_START@
   5  *
   6  * This file contains Original Code and/or Modifications of Original Code
   7  * as defined in and that are subject to the Apple Public Source License
   8  * Version 2.0 (the 'License'). You may not use this file except in
   9  * compliance with the License. The rights granted to you under the License
  10  * may not be used to create, or enable the creation or redistribution of,
  11  * unlawful or unlicensed copies of an Apple operating system, or to
  12  * circumvent, violate, or enable the circumvention or violation of, any
  13  * terms of an Apple operating system software license agreement.
  14  *
  15  * Please obtain a copy of the License at
  16  * http://www.opensource.apple.com/apsl/ and read it before using this file.
  17  *
  18  * The Original Code and all software distributed under the License are
  19  * distributed on an 'AS IS' basis, WITHOUT WARRANTY OF ANY KIND, EITHER
  20  * EXPRESS OR IMPLIED, AND APPLE HEREBY DISCLAIMS ALL SUCH WARRANTIES,
  21  * INCLUDING WITHOUT LIMITATION, ANY WARRANTIES OF MERCHANTABILITY,
  22  * FITNESS FOR A PARTICULAR PURPOSE, QUIET ENJOYMENT OR NON-INFRINGEMENT.
  23  * Please see the License for the specific language governing rights and
  24  * limitations under the License.
  25  *
  26  * @APPLE_OSREFERENCE_LICENSE_HEADER_END@
  27  */
  28
  29 #include <mach/mach_types.h>
  30 #include <mach/mach_host.h>
  31
  32 #include <kern/kern_types.h>
  33 #include <kern/ipc_kobject.h>
  34 #include <kern/host_notify.h>
  35
  36 #include <kern/queue.h>
  37
  38 #include "mach/host_notify_reply.h"
  39
  40 decl_lck_mtx_data(,host_notify_lock)
  41
  42 lck_mtx_ext_t                   host_notify_lock_ext;
  43 lck_grp_t                               host_notify_lock_grp;
  44 lck_attr_t                              host_notify_lock_attr;
  45 static lck_grp_attr_t   host_notify_lock_grp_attr;
  46 static zone_t                   host_notify_zone;
  47
  48 static queue_head_t             host_notify_queue[HOST_NOTIFY_TYPE_MAX+1];
  49
  50 static mach_msg_id_t    host_notify_replyid[HOST_NOTIFY_TYPE_MAX+1] =
  51                                                                 { HOST_CALENDAR_CHANGED_REPLYID,
  52                                                                   HOST_CALENDAR_SET_REPLYID };
  53
  54 struct host_notify_entry {
  55         queue_chain_t           entries;
  56         ipc_port_t                      port;
  57 };
  58
  59 typedef struct host_notify_entry        *host_notify_t;
  60
  61 void
  62 host_notify_init(void)
  63 {
  64         int             i;
  65
  66         for (i = 0; i <= HOST_NOTIFY_TYPE_MAX; i++)
  67                 queue_init(&host_notify_queue[i]);
  68
  69         lck_grp_attr_setdefault(&host_notify_lock_grp_attr);
  70         lck_grp_init(&host_notify_lock_grp, "host_notify", &host_notify_lock_grp_attr);
  71         lck_attr_setdefault(&host_notify_lock_attr);
  72
  73         lck_mtx_init_ext(&host_notify_lock, &host_notify_lock_ext, &host_notify_lock_grp, &host_notify_lock_attr);
  74
  75         i = sizeof (struct host_notify_entry);
  76         host_notify_zone =
  77                         zinit(i, (4096 * i), (16 * i), "host_notify");
  78 }
  79
  80 kern_return_t
  81 host_request_notification(
  82         host_t                                  host,
  83         host_flavor_t                   notify_type,
  84         ipc_port_t                              port)
  85 {
  86         host_notify_t           entry;
  87
  88         if (host == HOST_NULL)
  89                 return (KERN_INVALID_ARGUMENT);
  90
  91         if (!IP_VALID(port))
  92                 return (KERN_INVALID_CAPABILITY);
  93
  94         if (notify_type > HOST_NOTIFY_TYPE_MAX || notify_type < 0)
  95                 return (KERN_INVALID_ARGUMENT);
  96
  97         entry = (host_notify_t)zalloc(host_notify_zone);
  98         if (entry == NULL)
  99                 return (KERN_RESOURCE_SHORTAGE);
 100
 101         lck_mtx_lock(&host_notify_lock);
 102
 103         ip_lock(port);
 104         if (!ip_active(port) || port->ip_tempowner || ip_kotype(port) != IKOT_NONE) {
 105                 ip_unlock(port);
 106
 107                 lck_mtx_unlock(&host_notify_lock);
 108                 zfree(host_notify_zone, entry);
 109
 110                 return (KERN_FAILURE);
 111         }
 112
 113         entry->port = port;
 114         ipc_kobject_set_atomically(port, (ipc_kobject_t)entry, IKOT_HOST_NOTIFY);
 115         ip_unlock(port);
 116
 117         enqueue_tail(&host_notify_queue[notify_type], (queue_entry_t)entry);
 118         lck_mtx_unlock(&host_notify_lock);
 119
 120         return (KERN_SUCCESS);
 121 }
 122
 123 void
 124 host_notify_port_destroy(
 125         ipc_port_t                      port)
 126 {
 127         host_notify_t           entry;
 128
 129         lck_mtx_lock(&host_notify_lock);
 130
 131         ip_lock(port);
 132         if (ip_kotype(port) == IKOT_HOST_NOTIFY) {
 133                 entry = (host_notify_t)port->ip_kobject;
 134                 assert(entry != NULL);
 135                 ipc_kobject_set_atomically(port, IKO_NULL, IKOT_NONE);
 136                 ip_unlock(port);
 137
 138                 assert(entry->port == port);
 139                 remqueue((queue_entry_t)entry);
 140                 lck_mtx_unlock(&host_notify_lock);
 141                 zfree(host_notify_zone, entry);
 142
 143                 ipc_port_release_sonce(port);
 144                 return;
 145         }
 146         ip_unlock(port);
 147
 148         lck_mtx_unlock(&host_notify_lock);
 149 }
 150
 151 static void
 152 host_notify_all(
 153         host_flavor_t           notify_type,
 154         mach_msg_header_t       *msg,
 155         mach_msg_size_t         msg_size)
 156 {
 157         queue_t         notify_queue = &host_notify_queue[notify_type];
 158
 159         lck_mtx_lock(&host_notify_lock);
 160
 161         if (!queue_empty(notify_queue)) {
 162                 queue_head_t            send_queue;
 163                 host_notify_t           entry;
 164
 165                 send_queue = *notify_queue;
 166                 queue_init(notify_queue);
 167
 168                 send_queue.next->prev = &send_queue;
 169                 send_queue.prev->next = &send_queue;
 170
 171                 msg->msgh_bits =
 172                     MACH_MSGH_BITS_SET(MACH_MSG_TYPE_MOVE_SEND_ONCE, 0, 0, 0);
 173                 msg->msgh_local_port = MACH_PORT_NULL;
 174                 msg->msgh_voucher_port = MACH_PORT_NULL;
 175                 msg->msgh_id = host_notify_replyid[notify_type];
 176
 177                 while ((entry = (host_notify_t)dequeue(&send_queue)) != NULL) {
 178                         ipc_port_t              port;
 179
 180                         port = entry->port;
 181                         assert(port != IP_NULL);
 182
 183                         ip_lock(port);
 184                         assert(ip_kotype(port) == IKOT_HOST_NOTIFY);
 185                         assert(port->ip_kobject == (ipc_kobject_t)entry);
 186                         ipc_kobject_set_atomically(port, IKO_NULL, IKOT_NONE);
 187                         ip_unlock(port);
 188
 189                         lck_mtx_unlock(&host_notify_lock);
 190                         zfree(host_notify_zone, entry);
 191
 192                         msg->msgh_remote_port = port;
 193
 194                         (void) mach_msg_send_from_kernel_proper(msg, msg_size);
 195
 196                         lck_mtx_lock(&host_notify_lock);
 197                 }
 198         }
 199
 200         lck_mtx_unlock(&host_notify_lock);
 201 }
 202
 203 void
 204 host_notify_calendar_change(void)
 205 {
 206         __Request__host_calendar_changed_t      msg;
 207
 208         host_notify_all(HOST_NOTIFY_CALENDAR_CHANGE, &msg.Head, sizeof (msg));
 209 }
 210
 211 void
 212 host_notify_calendar_set(void)
 213 {
 214         __Request__host_calendar_set_t  msg;
 215
 216         host_notify_all(HOST_NOTIFY_CALENDAR_SET, &msg.Head, sizeof (msg));
 217 }