osfmk/ipc/ipc_space.h

   1 /*
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  28 /*
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  31 /*
  32  * Mach Operating System
  33  * Copyright (c) 1991,1990,1989 Carnegie Mellon University
  34  * All Rights Reserved.
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  42  * CARNEGIE MELLON ALLOWS FREE USE OF THIS SOFTWARE IN ITS "AS IS"
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  46  * Carnegie Mellon requests users of this software to return to
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  48  *  Software Distribution Coordinator  or  Software.Distribution@CS.CMU.EDU
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  56 /*
  57  * NOTICE: This file was modified by McAfee Research in 2004 to introduce
  58  * support for mandatory and extensible security protections.  This notice
  59  * is included in support of clause 2.2 (b) of the Apple Public License,
  60  * Version 2.0.
  61  */
  62 /*
  63  */
  64 /*
  65  *      File:   ipc/ipc_space.h
  66  *      Author: Rich Draves
  67  *      Date:   1989
  68  *
  69  *      Definitions for IPC spaces of capabilities.
  70  */
  71
  72 #ifndef _IPC_IPC_SPACE_H_
  73 #define _IPC_IPC_SPACE_H_
  74
  75
  76 #include <prng/random.h>
  77 #include <mach/mach_types.h>
  78 #include <mach/boolean.h>
  79 #include <mach/kern_return.h>
  80 #include <mach/vm_types.h>
  81
  82 #include <sys/appleapiopts.h>
  83
  84 #ifdef __APPLE_API_PRIVATE
  85 #ifdef MACH_KERNEL_PRIVATE
  86 #include <kern/macro_help.h>
  87 #include <kern/kern_types.h>
  88 #include <kern/locks.h>
  89 #include <kern/task.h>
  90 #include <kern/zalloc.h>
  91 #include <ipc/ipc_entry.h>
  92 #include <ipc/ipc_types.h>
  93
  94 #include <libkern/OSAtomic.h>
  95
  96 /*
  97  *      Every task has a space of IPC capabilities.
  98  *      IPC operations like send and receive use this space.
  99  *      IPC kernel calls manipulate the space of the target task.
 100  *
 101  *      Every space has a non-NULL is_table with is_table_size entries.
 102  *
 103  *      Only one thread can be growing the space at a time.  Others
 104  *      that need it grown wait for the first.  We do almost all the
 105  *      work with the space unlocked, so lookups proceed pretty much
 106  *      unaffected while the grow operation is underway.
 107  */
 108
 109 typedef natural_t ipc_space_refs_t;
 110 #define IS_REFS_MAX     0x0fffffff
 111 #define IS_INACTIVE     0x40000000      /* space is inactive */
 112 #define IS_GROWING      0x20000000      /* space is growing */
 113 #define IS_ENTROPY_CNT  1               /* per-space entropy pool size */
 114
 115 struct ipc_space {
 116         lck_spin_t      is_lock_data;
 117         ipc_space_refs_t is_bits;       /* holds refs, active, growing */
 118         ipc_entry_num_t is_table_size;  /* current size of table */
 119         ipc_entry_num_t is_table_hashed;/* count of hashed elements */
 120         ipc_entry_num_t is_table_free;  /* count of free elements */
 121         ipc_entry_t is_table;           /* an array of entries */
 122         task_t is_task;                 /* associated task */
 123         struct ipc_table_size *is_table_next; /* info for larger table */
 124         ipc_entry_num_t is_low_mod;     /* lowest modified entry during growth */
 125         ipc_entry_num_t is_high_mod;    /* highest modified entry during growth */
 126         struct bool_gen bool_gen;       /* state for boolean RNG */
 127         unsigned int is_entropy[IS_ENTROPY_CNT]; /* pool of entropy taken from RNG */
 128         int is_node_id;                 /* HOST_LOCAL_NODE, or remote node if proxy space */
 129 };
 130
 131 #define IS_NULL                 ((ipc_space_t) 0)
 132 #define IS_INSPECT_NULL         ((ipc_space_inspect_t) 0)
 133
 134 #define is_active(is)           (((is)->is_bits & IS_INACTIVE) != IS_INACTIVE)
 135
 136 static inline void
 137 is_mark_inactive(ipc_space_t is)
 138 {
 139         assert(is_active(is));
 140         OSBitOrAtomic(IS_INACTIVE, &is->is_bits);
 141 }
 142
 143 #define is_growing(is)          (((is)->is_bits & IS_GROWING) == IS_GROWING)
 144
 145 static inline void
 146 is_start_growing(ipc_space_t is)
 147 {
 148         assert(!is_growing(is));
 149         OSBitOrAtomic(IS_GROWING, &is->is_bits);
 150 }
 151
 152 static inline void
 153 is_done_growing(ipc_space_t is)
 154 {
 155         assert(is_growing(is));
 156         OSBitAndAtomic(~IS_GROWING, &is->is_bits);
 157 }
 158
 159 extern zone_t ipc_space_zone;
 160
 161 #define is_alloc()              ((ipc_space_t) zalloc(ipc_space_zone))
 162 #define is_free(is)             zfree(ipc_space_zone, (is))
 163
 164 extern ipc_space_t ipc_space_kernel;
 165 extern ipc_space_t ipc_space_reply;
 166 #if     DIPC
 167 extern ipc_space_t ipc_space_remote;
 168 #endif  /* DIPC */
 169 #if     DIPC
 170 extern ipc_space_t default_pager_space;
 171 #endif  /* DIPC */
 172
 173 extern lck_grp_t        ipc_lck_grp;
 174 extern lck_attr_t       ipc_lck_attr;
 175
 176 #define is_lock_init(is)        lck_spin_init(&(is)->is_lock_data, &ipc_lck_grp, &ipc_lck_attr)
 177 #define is_lock_destroy(is)     lck_spin_destroy(&(is)->is_lock_data, &ipc_lck_grp)
 178
 179 #define is_read_lock(is)        lck_spin_lock_grp(&(is)->is_lock_data, &ipc_lck_grp)
 180 #define is_read_unlock(is)      lck_spin_unlock(&(is)->is_lock_data)
 181 #define is_read_sleep(is)       lck_spin_sleep_grp(&(is)->is_lock_data,     \
 182                                                         LCK_SLEEP_DEFAULT,                                      \
 183                                                         (event_t)(is),                                          \
 184                                                         THREAD_UNINT,                                           \
 185                                                         &ipc_lck_grp)
 186
 187 #define is_write_lock(is)       lck_spin_lock_grp(&(is)->is_lock_data, &ipc_lck_grp)
 188 #define is_write_unlock(is)     lck_spin_unlock(&(is)->is_lock_data)
 189 #define is_write_sleep(is)      lck_spin_sleep_grp(&(is)->is_lock_data,     \
 190                                                         LCK_SLEEP_DEFAULT,                                      \
 191                                                         (event_t)(is),                                          \
 192                                                         THREAD_UNINT,                                           \
 193                                                         &ipc_lck_grp)
 194
 195 #define is_refs(is)             ((is)->is_bits & IS_REFS_MAX)
 196
 197 static inline void
 198 is_reference(ipc_space_t is)
 199 {
 200         assert(is_refs(is) > 0 && is_refs(is) < IS_REFS_MAX);
 201         OSIncrementAtomic(&(is->is_bits));
 202 }
 203
 204
 205 static inline void
 206 is_release(ipc_space_t is)
 207 {
 208         assert(is_refs(is) > 0);
 209
 210         /* If we just removed the last reference count */
 211         if (1 == (OSDecrementAtomic(&(is->is_bits)) & IS_REFS_MAX)) {
 212                 assert(!is_active(is));
 213                 is_lock_destroy(is);
 214                 is_free(is);
 215         }
 216 }
 217
 218 #define current_space_fast()    (current_task_fast()->itk_space)
 219 #define current_space()         (current_space_fast())
 220
 221 /* Create a special IPC space */
 222 extern kern_return_t ipc_space_create_special(
 223         ipc_space_t     *spacep);
 224
 225 /* Create a new IPC space */
 226 extern kern_return_t ipc_space_create(
 227         ipc_table_size_t        initial,
 228         ipc_space_t             *spacep);
 229
 230 /* Mark a space as dead and cleans up the entries*/
 231 extern void ipc_space_terminate(
 232         ipc_space_t     space);
 233
 234 /* Clean up the entries - but leave the space alive */
 235 extern void ipc_space_clean(
 236         ipc_space_t     space);
 237
 238 /* Permute the order of a range within an IPC space */
 239 extern void ipc_space_rand_freelist(
 240         ipc_space_t             space,
 241         ipc_entry_t             table,
 242         mach_port_index_t       bottom,
 243         mach_port_index_t       top);
 244
 245 /* Generate a new gencount rollover point from a space's entropy pool */
 246 extern ipc_entry_bits_t ipc_space_get_rollpoint(ipc_space_t space);
 247
 248 /* Allocate a new port/set/dead-name in a space */
 249 extern kern_return_t mach_port_allocate_internal(
 250         ipc_space_t       space,
 251         mach_port_right_t right,
 252         mach_port_qos_t   *qosp,
 253         mach_port_name_t  *namep);
 254
 255 #endif /* MACH_KERNEL_PRIVATE */
 256 #endif /* __APPLE_API_PRIVATE */
 257
 258 #ifdef  __APPLE_API_UNSTABLE
 259 #ifndef MACH_KERNEL_PRIVATE
 260
 261 extern ipc_space_t              current_space(void);
 262
 263 #endif /* !MACH_KERNEL_PRIVATE */
 264 #endif /* __APPLE_API_UNSTABLE */
 265
 266 /* Take a reference on a space */
 267 extern void ipc_space_reference(
 268         ipc_space_t     space);
 269
 270 /* Realase a reference on a space */
 271 extern void ipc_space_release(
 272         ipc_space_t     space);
 273
 274 #endif  /* _IPC_IPC_SPACE_H_ */