sys/security/mac/mac_internal.h

   1 /*-
   2  * Copyright (c) 1999-2002, 2006, 2009, 2019 Robert N. M. Watson
   3  * Copyright (c) 2001 Ilmar S. Habibulin
   4  * Copyright (c) 2001-2004 Networks Associates Technology, Inc.
   5  * Copyright (c) 2006 nCircle Network Security, Inc.
   6  * Copyright (c) 2006 SPARTA, Inc.
   7  * Copyright (c) 2009 Apple, Inc.
   8  * All rights reserved.
   9  *
  10  * This software was developed by Robert Watson and Ilmar Habibulin for the
  11  * TrustedBSD Project.
  12  *
  13  * This software was developed for the FreeBSD Project in part by Network
  14  * Associates Laboratories, the Security Research Division of Network
  15  * Associates, Inc. under DARPA/SPAWAR contract N66001-01-C-8035 ("CBOSS"),
  16  * as part of the DARPA CHATS research program.
  17  *
  18  * This software was developed by Robert N. M. Watson for the TrustedBSD
  19  * Project under contract to nCircle Network Security, Inc.
  20  *
  21  * This software was enhanced by SPARTA ISSO under SPAWAR contract
  22  * N66001-04-C-6019 ("SEFOS").
  23  *
  24  * This software was developed at the University of Cambridge Computer
  25  * Laboratory with support from a grant from Google, Inc.
  26  *
  27  * Redistribution and use in source and binary forms, with or without
  28  * modification, are permitted provided that the following conditions
  29  * are met:
  30  * 1. Redistributions of source code must retain the above copyright
  31  *    notice, this list of conditions and the following disclaimer.
  32  * 2. Redistributions in binary form must reproduce the above copyright
  33  *    notice, this list of conditions and the following disclaimer in the
  34  *    documentation and/or other materials provided with the distribution.
  35  *
  36  * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
  37  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
  38  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
  39  * ARE DISCLAIMED.  IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
  40  * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
  41  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
  42  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
  43  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
  44  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
  45  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
  46  * SUCH DAMAGE.
  47  *
  48  * $FreeBSD$
  49  */
  50
  51 #ifndef _SECURITY_MAC_MAC_INTERNAL_H_
  52 #define _SECURITY_MAC_MAC_INTERNAL_H_
  53
  54 #ifndef _KERNEL
  55 #error "no user-serviceable parts inside"
  56 #endif
  57
  58 #include <sys/lock.h>
  59 #include <sys/rmlock.h>
  60
  61 /*
  62  * MAC Framework sysctl namespace.
  63  */
  64 #ifdef SYSCTL_DECL
  65 SYSCTL_DECL(_security_mac);
  66 #endif /* SYSCTL_DECL */
  67
  68 /*
  69  * MAC Framework SDT DTrace probe namespace, macros for declaring entry
  70  * point probes, macros for invoking them.
  71  */
  72 #ifdef SDT_PROVIDER_DECLARE
  73 SDT_PROVIDER_DECLARE(mac);              /* MAC Framework-level events. */
  74 SDT_PROVIDER_DECLARE(mac_framework);    /* Entry points to MAC. */
  75
  76 #define MAC_CHECK_PROBE_DEFINE4(name, arg0, arg1, arg2, arg3)           \
  77         SDT_PROBE_DEFINE5(mac_framework, , name, mac__check__err,       \
  78             "int", arg0, arg1, arg2, arg3);                             \
  79         SDT_PROBE_DEFINE5(mac_framework, , name, mac__check__ok,        \
  80             "int", arg0, arg1, arg2, arg3);
  81
  82 #define MAC_CHECK_PROBE_DEFINE3(name, arg0, arg1, arg2)                 \
  83         SDT_PROBE_DEFINE4(mac_framework, , name, mac__check__err,       \
  84             "int", arg0, arg1, arg2);                                   \
  85         SDT_PROBE_DEFINE4(mac_framework, , name, mac__check__ok,        \
  86             "int", arg0, arg1, arg2);
  87
  88 #define MAC_CHECK_PROBE_DEFINE2(name, arg0, arg1)                       \
  89         SDT_PROBE_DEFINE3(mac_framework, , name, mac__check__err,       \
  90             "int", arg0, arg1);                                         \
  91         SDT_PROBE_DEFINE3(mac_framework, , name, mac__check__ok,        \
  92             "int", arg0, arg1);
  93
  94 #define MAC_CHECK_PROBE_DEFINE1(name, arg0)                             \
  95         SDT_PROBE_DEFINE2(mac_framework, , name, mac__check__err,       \
  96             "int", arg0);                                               \
  97         SDT_PROBE_DEFINE2(mac_framework, , name, mac__check__ok,        \
  98             "int", arg0);
  99
 100 #define MAC_CHECK_PROBE4(name, error, arg0, arg1, arg2, arg3)   do {    \
 101         if (SDT_PROBES_ENABLED()) {                                     \
 102                 if (error) {                                            \
 103                         SDT_PROBE5(mac_framework, , name, mac__check__err,\
 104                             error, arg0, arg1, arg2, arg3);             \
 105                 } else {                                                \
 106                         SDT_PROBE5(mac_framework, , name, mac__check__ok,\
 107                             0, arg0, arg1, arg2, arg3);                 \
 108                 }                                                       \
 109         }                                                               \
 110 } while (0)
 111
 112 #define MAC_CHECK_PROBE3(name, error, arg0, arg1, arg2)                 \
 113         MAC_CHECK_PROBE4(name, error, arg0, arg1, arg2, 0)
 114 #define MAC_CHECK_PROBE2(name, error, arg0, arg1)                       \
 115         MAC_CHECK_PROBE3(name, error, arg0, arg1, 0)
 116 #define MAC_CHECK_PROBE1(name, error, arg0)                             \
 117         MAC_CHECK_PROBE2(name, error, arg0, 0)
 118 #endif
 119
 120 #define MAC_GRANT_PROBE_DEFINE2(name, arg0, arg1)                       \
 121         SDT_PROBE_DEFINE3(mac_framework, , name, mac__grant__err,       \
 122             "int", arg0, arg1);                                         \
 123         SDT_PROBE_DEFINE3(mac_framework, , name, mac__grant__ok,        \
 124             "int", arg0, arg1);
 125
 126 #define MAC_GRANT_PROBE2(name, error, arg0, arg1)       do {            \
 127         if (SDT_PROBES_ENABLED()) {                                     \
 128                 if (error) {                                            \
 129                         SDT_PROBE3(mac_framework, , name, mac__grant__err,\
 130                             error, arg0, arg1);                         \
 131                 } else {                                                \
 132                         SDT_PROBE3(mac_framework, , name, mac__grant__ok,\
 133                             error, arg0, arg1);                         \
 134                 }                                                       \
 135         }                                                               \
 136 } while (0)
 137
 138 /*
 139  * MAC Framework global types and typedefs.
 140  */
 141 LIST_HEAD(mac_policy_list_head, mac_policy_conf);
 142 #ifdef MALLOC_DECLARE
 143 MALLOC_DECLARE(M_MACTEMP);
 144 #endif
 145
 146 /*
 147  * MAC labels -- in-kernel storage format.
 148  *
 149  * In general, struct label pointers are embedded in kernel data structures
 150  * representing objects that may be labeled (and protected).  Struct label is
 151  * opaque to both kernel services that invoke the MAC Framework and MAC
 152  * policy modules.  In particular, we do not wish to encode the layout of the
 153  * label structure into any ABIs.  Historically, the slot array contained
 154  * unions of {long, void} but now contains uintptr_t.
 155  */
 156 #define MAC_MAX_SLOTS   4
 157 #define MAC_FLAG_INITIALIZED    0x0000001       /* Is initialized for use. */
 158 struct label {
 159         int             l_flags;
 160         intptr_t        l_perpolicy[MAC_MAX_SLOTS];
 161 };
 162
 163
 164 /*
 165  * Flags for mac_labeled, a bitmask of object types need across the union of
 166  * all policies currently registered with the MAC Framework, used to key
 167  * whether or not labels are allocated and constructors for the type are
 168  * invoked.
 169  */
 170 #define MPC_OBJECT_CRED                 0x0000000000000001
 171 #define MPC_OBJECT_PROC                 0x0000000000000002
 172 #define MPC_OBJECT_VNODE                0x0000000000000004
 173 #define MPC_OBJECT_INPCB                0x0000000000000008
 174 #define MPC_OBJECT_SOCKET               0x0000000000000010
 175 #define MPC_OBJECT_DEVFS                0x0000000000000020
 176 #define MPC_OBJECT_MBUF                 0x0000000000000040
 177 #define MPC_OBJECT_IPQ                  0x0000000000000080
 178 #define MPC_OBJECT_IFNET                0x0000000000000100
 179 #define MPC_OBJECT_BPFDESC              0x0000000000000200
 180 #define MPC_OBJECT_PIPE                 0x0000000000000400
 181 #define MPC_OBJECT_MOUNT                0x0000000000000800
 182 #define MPC_OBJECT_POSIXSEM             0x0000000000001000
 183 #define MPC_OBJECT_POSIXSHM             0x0000000000002000
 184 #define MPC_OBJECT_SYSVMSG              0x0000000000004000
 185 #define MPC_OBJECT_SYSVMSQ              0x0000000000008000
 186 #define MPC_OBJECT_SYSVSEM              0x0000000000010000
 187 #define MPC_OBJECT_SYSVSHM              0x0000000000020000
 188 #define MPC_OBJECT_SYNCACHE             0x0000000000040000
 189 #define MPC_OBJECT_IP6Q                 0x0000000000080000
 190
 191 /*
 192  * MAC Framework global variables.
 193  */
 194 extern struct mac_policy_list_head      mac_policy_list;
 195 extern struct mac_policy_list_head      mac_static_policy_list;
 196 extern u_int                            mac_policy_count;
 197 extern uint64_t                         mac_labeled;
 198 extern struct mtx                       mac_ifnet_mtx;
 199
 200 /*
 201  * MAC Framework infrastructure functions.
 202  */
 203 int     mac_error_select(int error1, int error2);
 204
 205 void    mac_policy_slock_nosleep(struct rm_priotracker *tracker);
 206 void    mac_policy_slock_sleep(void);
 207 void    mac_policy_sunlock_nosleep(struct rm_priotracker *tracker);
 208 void    mac_policy_sunlock_sleep(void);
 209
 210 struct label    *mac_labelzone_alloc(int flags);
 211 void             mac_labelzone_free(struct label *label);
 212 void             mac_labelzone_init(void);
 213
 214 void    mac_init_label(struct label *label);
 215 void    mac_destroy_label(struct label *label);
 216 int     mac_check_structmac_consistent(struct mac *mac);
 217 int     mac_allocate_slot(void);
 218
 219 /*
 220  * Lock ifnets to protect labels only if ifnet labels are in use.
 221  */
 222 #define MAC_IFNET_LOCK(ifp, locked)     do {                            \
 223         if (mac_labeled & MPC_OBJECT_IFNET) {                           \
 224                 mtx_lock(&mac_ifnet_mtx);                               \
 225                 locked = 1;                                             \
 226         } else {                                                        \
 227                 locked = 0;                                             \
 228         }                                                               \
 229 } while (0)
 230
 231 #define MAC_IFNET_UNLOCK(ifp, locked)   do {                            \
 232         if (locked) {                                                   \
 233                 mtx_unlock(&mac_ifnet_mtx);                             \
 234                 locked = 0;                                             \
 235         }                                                               \
 236 } while (0)
 237
 238 /*
 239  * MAC Framework per-object type functions.  It's not yet clear how the
 240  * namespaces, etc, should work for these, so for now, sort by object type.
 241  */
 242 struct label    *mac_cred_label_alloc(void);
 243 void             mac_cred_label_free(struct label *label);
 244 struct label    *mac_pipe_label_alloc(void);
 245 void             mac_pipe_label_free(struct label *label);
 246 struct label    *mac_socket_label_alloc(int flag);
 247 void             mac_socket_label_free(struct label *label);
 248 struct label    *mac_vnode_label_alloc(void);
 249 void             mac_vnode_label_free(struct label *label);
 250
 251 int     mac_cred_check_relabel(struct ucred *cred, struct label *newlabel);
 252 int     mac_cred_externalize_label(struct label *label, char *elements,
 253             char *outbuf, size_t outbuflen);
 254 int     mac_cred_internalize_label(struct label *label, char *string);
 255 void    mac_cred_relabel(struct ucred *cred, struct label *newlabel);
 256
 257 struct label    *mac_mbuf_to_label(struct mbuf *m);
 258
 259 void    mac_pipe_copy_label(struct label *src, struct label *dest);
 260 int     mac_pipe_externalize_label(struct label *label, char *elements,
 261             char *outbuf, size_t outbuflen);
 262 int     mac_pipe_internalize_label(struct label *label, char *string);
 263
 264 int     mac_socket_label_set(struct ucred *cred, struct socket *so,
 265             struct label *label);
 266 void    mac_socket_copy_label(struct label *src, struct label *dest);
 267 int     mac_socket_externalize_label(struct label *label, char *elements,
 268             char *outbuf, size_t outbuflen);
 269 int     mac_socket_internalize_label(struct label *label, char *string);
 270
 271 int     mac_vnode_externalize_label(struct label *label, char *elements,
 272             char *outbuf, size_t outbuflen);
 273 int     mac_vnode_internalize_label(struct label *label, char *string);
 274 void    mac_vnode_check_mmap_downgrade(struct ucred *cred, struct vnode *vp,
 275             int *prot);
 276 int     vn_setlabel(struct vnode *vp, struct label *intlabel,
 277             struct ucred *cred);
 278
 279 /*
 280  * MAC Framework composition macros invoke all registered MAC policies for a
 281  * specific entry point.  They come in two forms: one which permits policies
 282  * to sleep/block, and another that does not.
 283  *
 284  * MAC_POLICY_CHECK performs the designated check by walking the policy
 285  * module list and checking with each as to how it feels about the request.
 286  * Note that it returns its value via 'error' in the scope of the caller.
 287  */
 288 #define MAC_POLICY_CHECK(check, args...) do {                           \
 289         struct mac_policy_conf *mpc;                                    \
 290                                                                         \
 291         error = 0;                                                      \
 292         LIST_FOREACH(mpc, &mac_static_policy_list, mpc_list) {          \
 293                 if (mpc->mpc_ops->mpo_ ## check != NULL)                \
 294                         error = mac_error_select(                       \
 295                             mpc->mpc_ops->mpo_ ## check (args),         \
 296                             error);                                     \
 297         }                                                               \
 298         if (!LIST_EMPTY(&mac_policy_list)) {                            \
 299                 mac_policy_slock_sleep();                               \
 300                 LIST_FOREACH(mpc, &mac_policy_list, mpc_list) {         \
 301                         if (mpc->mpc_ops->mpo_ ## check != NULL)        \
 302                                 error = mac_error_select(               \
 303                                     mpc->mpc_ops->mpo_ ## check (args), \
 304                                     error);                             \
 305                 }                                                       \
 306                 mac_policy_sunlock_sleep();                             \
 307         }                                                               \
 308 } while (0)
 309
 310 #define MAC_POLICY_CHECK_NOSLEEP(check, args...) do {                   \
 311         struct mac_policy_conf *mpc;                                    \
 312                                                                         \
 313         error = 0;                                                      \
 314         LIST_FOREACH(mpc, &mac_static_policy_list, mpc_list) {          \
 315                 if (mpc->mpc_ops->mpo_ ## check != NULL)                \
 316                         error = mac_error_select(                       \
 317                             mpc->mpc_ops->mpo_ ## check (args),         \
 318                             error);                                     \
 319         }                                                               \
 320         if (!LIST_EMPTY(&mac_policy_list)) {                            \
 321                 struct rm_priotracker tracker;                          \
 322                                                                         \
 323                 mac_policy_slock_nosleep(&tracker);                     \
 324                 LIST_FOREACH(mpc, &mac_policy_list, mpc_list) {         \
 325                         if (mpc->mpc_ops->mpo_ ## check != NULL)        \
 326                                 error = mac_error_select(               \
 327                                     mpc->mpc_ops->mpo_ ## check (args), \
 328                                     error);                             \
 329                 }                                                       \
 330                 mac_policy_sunlock_nosleep(&tracker);                   \
 331         }                                                               \
 332 } while (0)
 333
 334 /*
 335  * MAC_POLICY_GRANT performs the designated check by walking the policy
 336  * module list and checking with each as to how it feels about the request.
 337  * Unlike MAC_POLICY_CHECK, it grants if any policies return '0', and
 338  * otherwise returns EPERM.  Note that it returns its value via 'error' in
 339  * the scope of the caller.
 340  */
 341 #define MAC_POLICY_GRANT_NOSLEEP(check, args...) do {                   \
 342         struct mac_policy_conf *mpc;                                    \
 343                                                                         \
 344         error = EPERM;                                                  \
 345         LIST_FOREACH(mpc, &mac_static_policy_list, mpc_list) {          \
 346                 if (mpc->mpc_ops->mpo_ ## check != NULL) {              \
 347                         if (mpc->mpc_ops->mpo_ ## check(args) == 0)     \
 348                                 error = 0;                              \
 349                 }                                                       \
 350         }                                                               \
 351         if (!LIST_EMPTY(&mac_policy_list)) {                            \
 352                 struct rm_priotracker tracker;                          \
 353                                                                         \
 354                 mac_policy_slock_nosleep(&tracker);                     \
 355                 LIST_FOREACH(mpc, &mac_policy_list, mpc_list) {         \
 356                         if (mpc->mpc_ops->mpo_ ## check != NULL) {      \
 357                                 if (mpc->mpc_ops->mpo_ ## check (args)  \
 358                                     == 0)                               \
 359                                         error = 0;                      \
 360                         }                                               \
 361                 }                                                       \
 362                 mac_policy_sunlock_nosleep(&tracker);                   \
 363         }                                                               \
 364 } while (0)
 365
 366 /*
 367  * MAC_POLICY_BOOLEAN performs the designated boolean composition by walking
 368  * the module list, invoking each instance of the operation, and combining
 369  * the results using the passed C operator.  Note that it returns its value
 370  * via 'result' in the scope of the caller, which should be initialized by
 371  * the caller in a meaningful way to get a meaningful result.
 372  */
 373 #define MAC_POLICY_BOOLEAN(operation, composition, args...) do {        \
 374         struct mac_policy_conf *mpc;                                    \
 375                                                                         \
 376         LIST_FOREACH(mpc, &mac_static_policy_list, mpc_list) {          \
 377                 if (mpc->mpc_ops->mpo_ ## operation != NULL)            \
 378                         result = result composition                     \
 379                             mpc->mpc_ops->mpo_ ## operation (args);     \
 380         }                                                               \
 381         if (!LIST_EMPTY(&mac_policy_list)) {                            \
 382                 mac_policy_slock_sleep();                               \
 383                 LIST_FOREACH(mpc, &mac_policy_list, mpc_list) {         \
 384                         if (mpc->mpc_ops->mpo_ ## operation != NULL)    \
 385                                 result = result composition             \
 386                                     mpc->mpc_ops->mpo_ ## operation     \
 387                                     (args);                             \
 388                 }                                                       \
 389                 mac_policy_sunlock_sleep();                             \
 390         }                                                               \
 391 } while (0)
 392
 393 #define MAC_POLICY_BOOLEAN_NOSLEEP(operation, composition, args...) do {\
 394         struct mac_policy_conf *mpc;                                    \
 395                                                                         \
 396         LIST_FOREACH(mpc, &mac_static_policy_list, mpc_list) {          \
 397                 if (mpc->mpc_ops->mpo_ ## operation != NULL)            \
 398                         result = result composition                     \
 399                             mpc->mpc_ops->mpo_ ## operation (args);     \
 400         }                                                               \
 401         if (!LIST_EMPTY(&mac_policy_list)) {                            \
 402                 struct rm_priotracker tracker;                          \
 403                                                                         \
 404                 mac_policy_slock_nosleep(&tracker);                     \
 405                 LIST_FOREACH(mpc, &mac_policy_list, mpc_list) {         \
 406                         if (mpc->mpc_ops->mpo_ ## operation != NULL)    \
 407                                 result = result composition             \
 408                                     mpc->mpc_ops->mpo_ ## operation     \
 409                                     (args);                             \
 410                 }                                                       \
 411                 mac_policy_sunlock_nosleep(&tracker);                   \
 412         }                                                               \
 413 } while (0)
 414
 415 /*
 416  * MAC_POLICY_EXTERNALIZE queries each policy to see if it can generate an
 417  * externalized version of a label element by name.  Policies declare whether
 418  * they have matched a particular element name, parsed from the string by
 419  * MAC_POLICY_EXTERNALIZE, and an error is returned if any element is matched
 420  * by no policy.
 421  */
 422 #define MAC_POLICY_EXTERNALIZE(type, label, elementlist, outbuf,        \
 423     outbuflen) do {                                                     \
 424         int claimed, first, ignorenotfound, savedlen;                   \
 425         char *element_name, *element_temp;                              \
 426         struct sbuf sb;                                                 \
 427                                                                         \
 428         error = 0;                                                      \
 429         first = 1;                                                      \
 430         sbuf_new(&sb, outbuf, outbuflen, SBUF_FIXEDLEN);                \
 431         element_temp = elementlist;                                     \
 432         while ((element_name = strsep(&element_temp, ",")) != NULL) {   \
 433                 if (element_name[0] == '?') {                           \
 434                         element_name++;                                 \
 435                         ignorenotfound = 1;                             \
 436                  } else                                                 \
 437                         ignorenotfound = 0;                             \
 438                 savedlen = sbuf_len(&sb);                               \
 439                 if (first)                                              \
 440                         error = sbuf_printf(&sb, "%s/", element_name);  \
 441                 else                                                    \
 442                         error = sbuf_printf(&sb, ",%s/", element_name); \
 443                 if (error == -1) {                                      \
 444                         error = EINVAL; /* XXX: E2BIG? */               \
 445                         break;                                          \
 446                 }                                                       \
 447                 claimed = 0;                                            \
 448                 MAC_POLICY_CHECK(type ## _externalize_label, label,     \
 449                     element_name, &sb, &claimed);                       \
 450                 if (error)                                              \
 451                         break;                                          \
 452                 if (claimed == 0 && ignorenotfound) {                   \
 453                         /* Revert last label name. */                   \
 454                         sbuf_setpos(&sb, savedlen);                     \
 455                 } else if (claimed != 1) {                              \
 456                         error = EINVAL; /* XXX: ENOLABEL? */            \
 457                         break;                                          \
 458                 } else {                                                \
 459                         first = 0;                                      \
 460                 }                                                       \
 461         }                                                               \
 462         sbuf_finish(&sb);                                               \
 463 } while (0)
 464
 465 /*
 466  * MAC_POLICY_INTERNALIZE presents parsed element names and data to each
 467  * policy to see if any is willing to claim it and internalize the label
 468  * data.  If no policies match, an error is returned.
 469  */
 470 #define MAC_POLICY_INTERNALIZE(type, label, instring) do {              \
 471         char *element, *element_name, *element_data;                    \
 472         int claimed;                                                    \
 473                                                                         \
 474         error = 0;                                                      \
 475         element = instring;                                             \
 476         while ((element_name = strsep(&element, ",")) != NULL) {        \
 477                 element_data = element_name;                            \
 478                 element_name = strsep(&element_data, "/");              \
 479                 if (element_data == NULL) {                             \
 480                         error = EINVAL;                                 \
 481                         break;                                          \
 482                 }                                                       \
 483                 claimed = 0;                                            \
 484                 MAC_POLICY_CHECK(type ## _internalize_label, label,     \
 485                     element_name, element_data, &claimed);              \
 486                 if (error)                                              \
 487                         break;                                          \
 488                 if (claimed != 1) {                                     \
 489                         /* XXXMAC: Another error here? */               \
 490                         error = EINVAL;                                 \
 491                         break;                                          \
 492                 }                                                       \
 493         }                                                               \
 494 } while (0)
 495
 496 /*
 497  * MAC_POLICY_PERFORM performs the designated operation by walking the policy
 498  * module list and invoking that operation for each policy.
 499  */
 500 #define MAC_POLICY_PERFORM(operation, args...) do {                     \
 501         struct mac_policy_conf *mpc;                                    \
 502                                                                         \
 503         LIST_FOREACH(mpc, &mac_static_policy_list, mpc_list) {          \
 504                 if (mpc->mpc_ops->mpo_ ## operation != NULL)            \
 505                         mpc->mpc_ops->mpo_ ## operation (args);         \
 506         }                                                               \
 507         if (!LIST_EMPTY(&mac_policy_list)) {                            \
 508                 mac_policy_slock_sleep();                               \
 509                 LIST_FOREACH(mpc, &mac_policy_list, mpc_list) {         \
 510                         if (mpc->mpc_ops->mpo_ ## operation != NULL)    \
 511                                 mpc->mpc_ops->mpo_ ## operation (args); \
 512                 }                                                       \
 513                 mac_policy_sunlock_sleep();                             \
 514         }                                                               \
 515 } while (0)
 516
 517 #define MAC_POLICY_PERFORM_NOSLEEP(operation, args...) do {             \
 518         struct mac_policy_conf *mpc;                                    \
 519                                                                         \
 520         LIST_FOREACH(mpc, &mac_static_policy_list, mpc_list) {          \
 521                 if (mpc->mpc_ops->mpo_ ## operation != NULL)            \
 522                         mpc->mpc_ops->mpo_ ## operation (args);         \
 523         }                                                               \
 524         if (!LIST_EMPTY(&mac_policy_list)) {                            \
 525                 struct rm_priotracker tracker;                          \
 526                                                                         \
 527                 mac_policy_slock_nosleep(&tracker);                     \
 528                 LIST_FOREACH(mpc, &mac_policy_list, mpc_list) {         \
 529                         if (mpc->mpc_ops->mpo_ ## operation != NULL)    \
 530                                 mpc->mpc_ops->mpo_ ## operation (args); \
 531                 }                                                       \
 532                 mac_policy_sunlock_nosleep(&tracker);                   \
 533         }                                                               \
 534 } while (0)
 535
 536 #endif /* !_SECURITY_MAC_MAC_INTERNAL_H_ */