The Design and Implementation of the FreeBSD Operating System, Second Edition
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FreeBSD/Linux Kernel Cross Reference
sys/security/mac/mac_internal.h

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    1 /*-
    2  * Copyright (c) 1999-2002, 2006, 2009 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: releng/9.1/sys/security/mac/mac_internal.h 211616 2010-08-22 11:18:57Z rpaulo $
   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, kernel, name, mac_check_err,   \
   78             mac-check-ok, "int", arg0, arg1, arg2, arg3);               \
   79         SDT_PROBE_DEFINE5(mac_framework, kernel, name, mac_check_ok,    \
   80             mac-check-ok, "int", arg0, arg1, arg2, arg3);
   81 
   82 #define MAC_CHECK_PROBE_DEFINE3(name, arg0, arg1, arg2)                 \
   83         SDT_PROBE_DEFINE4(mac_framework, kernel, name, mac_check_err,   \
   84             mac-check-err, "int", arg0, arg1, arg2);                    \
   85         SDT_PROBE_DEFINE4(mac_framework, kernel, name, mac_check_ok,    \
   86             mac-check-ok, "int", arg0, arg1, arg2);
   87 
   88 #define MAC_CHECK_PROBE_DEFINE2(name, arg0, arg1)                       \
   89         SDT_PROBE_DEFINE3(mac_framework, kernel, name, mac_check_err,   \
   90             mac-check-err, "int", arg0, arg1);                          \
   91         SDT_PROBE_DEFINE3(mac_framework, kernel, name, mac_check_ok,    \
   92             mac-check-ok, "int", arg0, arg1);
   93 
   94 #define MAC_CHECK_PROBE_DEFINE1(name, arg0)                             \
   95         SDT_PROBE_DEFINE2(mac_framework, kernel, name, mac_check_err,   \
   96             mac-check-err, "int", arg0);                                \
   97         SDT_PROBE_DEFINE2(mac_framework, kernel, name, mac_check_ok,    \
   98             mac-check-ok, "int", arg0);
   99 
  100 #define MAC_CHECK_PROBE4(name, error, arg0, arg1, arg2, arg3)   do {    \
  101         if (error) {                                                    \
  102                 SDT_PROBE(mac_framework, kernel, name, mac_check_err,   \
  103                     error, arg0, arg1, arg2, arg3);                     \
  104         } else {                                                        \
  105                 SDT_PROBE(mac_framework, kernel, name, mac_check_ok,    \
  106                     0, arg0, arg1, arg2, arg3);                         \
  107         }                                                               \
  108 } while (0)
  109 
  110 #define MAC_CHECK_PROBE3(name, error, arg0, arg1, arg2)                 \
  111         MAC_CHECK_PROBE4(name, error, arg0, arg1, arg2, 0)
  112 #define MAC_CHECK_PROBE2(name, error, arg0, arg1)                       \
  113         MAC_CHECK_PROBE3(name, error, arg0, arg1, 0)
  114 #define MAC_CHECK_PROBE1(name, error, arg0)                             \
  115         MAC_CHECK_PROBE2(name, error, arg0, 0)
  116 #endif
  117 
  118 #define MAC_GRANT_PROBE_DEFINE2(name, arg0, arg1)                       \
  119         SDT_PROBE_DEFINE3(mac_framework, kernel, name, mac_grant_err,   \
  120             mac-grant-err, "int", arg0, arg1);                          \
  121         SDT_PROBE_DEFINE3(mac_framework, kernel, name, mac_grant_ok,    \
  122             mac-grant-ok, "INT", arg0, arg1);
  123 
  124 #define MAC_GRANT_PROBE2(name, error, arg0, arg1)       do {            \
  125         if (error) {                                                    \
  126                 SDT_PROBE(mac_framework, kernel, name, mac_grant_err,   \
  127                     error, arg0, arg1, 0, 0);                           \
  128         } else {                                                        \
  129                 SDT_PROBE(mac_framework, kernel, name, mac_grant_ok,    \
  130                     error, arg0, arg1, 0, 0);                           \
  131         }                                                               \
  132 } while (0)
  133 
  134 /*
  135  * MAC Framework global types and typedefs.
  136  */
  137 LIST_HEAD(mac_policy_list_head, mac_policy_conf);
  138 #ifdef MALLOC_DECLARE
  139 MALLOC_DECLARE(M_MACTEMP);
  140 #endif
  141 
  142 /*
  143  * MAC labels -- in-kernel storage format.
  144  *
  145  * In general, struct label pointers are embedded in kernel data structures
  146  * representing objects that may be labeled (and protected).  Struct label is
  147  * opaque to both kernel services that invoke the MAC Framework and MAC
  148  * policy modules.  In particular, we do not wish to encode the layout of the
  149  * label structure into any ABIs.  Historically, the slot array contained
  150  * unions of {long, void} but now contains uintptr_t.
  151  */
  152 #define MAC_MAX_SLOTS   4
  153 #define MAC_FLAG_INITIALIZED    0x0000001       /* Is initialized for use. */
  154 struct label {
  155         int             l_flags;
  156         intptr_t        l_perpolicy[MAC_MAX_SLOTS];
  157 };
  158 
  159 
  160 /*
  161  * Flags for mac_labeled, a bitmask of object types need across the union of
  162  * all policies currently registered with the MAC Framework, used to key
  163  * whether or not labels are allocated and constructors for the type are
  164  * invoked.
  165  */
  166 #define MPC_OBJECT_CRED                 0x0000000000000001
  167 #define MPC_OBJECT_PROC                 0x0000000000000002
  168 #define MPC_OBJECT_VNODE                0x0000000000000004
  169 #define MPC_OBJECT_INPCB                0x0000000000000008
  170 #define MPC_OBJECT_SOCKET               0x0000000000000010
  171 #define MPC_OBJECT_DEVFS                0x0000000000000020
  172 #define MPC_OBJECT_MBUF                 0x0000000000000040
  173 #define MPC_OBJECT_IPQ                  0x0000000000000080
  174 #define MPC_OBJECT_IFNET                0x0000000000000100
  175 #define MPC_OBJECT_BPFDESC              0x0000000000000200
  176 #define MPC_OBJECT_PIPE                 0x0000000000000400
  177 #define MPC_OBJECT_MOUNT                0x0000000000000800
  178 #define MPC_OBJECT_POSIXSEM             0x0000000000001000
  179 #define MPC_OBJECT_POSIXSHM             0x0000000000002000
  180 #define MPC_OBJECT_SYSVMSG              0x0000000000004000
  181 #define MPC_OBJECT_SYSVMSQ              0x0000000000008000
  182 #define MPC_OBJECT_SYSVSEM              0x0000000000010000
  183 #define MPC_OBJECT_SYSVSHM              0x0000000000020000
  184 #define MPC_OBJECT_SYNCACHE             0x0000000000040000
  185 #define MPC_OBJECT_IP6Q                 0x0000000000080000
  186 
  187 /*
  188  * MAC Framework global variables.
  189  */
  190 extern struct mac_policy_list_head      mac_policy_list;
  191 extern struct mac_policy_list_head      mac_static_policy_list;
  192 extern u_int                            mac_policy_count;
  193 extern uint64_t                         mac_labeled;
  194 extern struct mtx                       mac_ifnet_mtx;
  195 
  196 /*
  197  * MAC Framework infrastructure functions.
  198  */
  199 int     mac_error_select(int error1, int error2);
  200 
  201 void    mac_policy_slock_nosleep(struct rm_priotracker *tracker);
  202 void    mac_policy_slock_sleep(void);
  203 void    mac_policy_sunlock_nosleep(struct rm_priotracker *tracker);
  204 void    mac_policy_sunlock_sleep(void);
  205 
  206 struct label    *mac_labelzone_alloc(int flags);
  207 void             mac_labelzone_free(struct label *label);
  208 void             mac_labelzone_init(void);
  209 
  210 void    mac_init_label(struct label *label);
  211 void    mac_destroy_label(struct label *label);
  212 int     mac_check_structmac_consistent(struct mac *mac);
  213 int     mac_allocate_slot(void);
  214 
  215 #define MAC_IFNET_LOCK(ifp)     mtx_lock(&mac_ifnet_mtx)
  216 #define MAC_IFNET_UNLOCK(ifp)   mtx_unlock(&mac_ifnet_mtx)
  217 
  218 /*
  219  * MAC Framework per-object type functions.  It's not yet clear how the
  220  * namespaces, etc, should work for these, so for now, sort by object type.
  221  */
  222 struct label    *mac_cred_label_alloc(void);
  223 void             mac_cred_label_free(struct label *label);
  224 struct label    *mac_pipe_label_alloc(void);
  225 void             mac_pipe_label_free(struct label *label);
  226 struct label    *mac_socket_label_alloc(int flag);
  227 void             mac_socket_label_free(struct label *label);
  228 struct label    *mac_vnode_label_alloc(void);
  229 void             mac_vnode_label_free(struct label *label);
  230 
  231 int     mac_cred_check_relabel(struct ucred *cred, struct label *newlabel);
  232 int     mac_cred_externalize_label(struct label *label, char *elements,
  233             char *outbuf, size_t outbuflen);
  234 int     mac_cred_internalize_label(struct label *label, char *string);
  235 void    mac_cred_relabel(struct ucred *cred, struct label *newlabel);
  236 
  237 struct label    *mac_mbuf_to_label(struct mbuf *m);
  238 
  239 void    mac_pipe_copy_label(struct label *src, struct label *dest);
  240 int     mac_pipe_externalize_label(struct label *label, char *elements,
  241             char *outbuf, size_t outbuflen);
  242 int     mac_pipe_internalize_label(struct label *label, char *string);
  243 
  244 int     mac_socket_label_set(struct ucred *cred, struct socket *so,
  245             struct label *label);
  246 void    mac_socket_copy_label(struct label *src, struct label *dest);
  247 int     mac_socket_externalize_label(struct label *label, char *elements,
  248             char *outbuf, size_t outbuflen);
  249 int     mac_socket_internalize_label(struct label *label, char *string);
  250 
  251 int     mac_vnode_externalize_label(struct label *label, char *elements,
  252             char *outbuf, size_t outbuflen);
  253 int     mac_vnode_internalize_label(struct label *label, char *string);
  254 void    mac_vnode_check_mmap_downgrade(struct ucred *cred, struct vnode *vp,
  255             int *prot);
  256 int     vn_setlabel(struct vnode *vp, struct label *intlabel,
  257             struct ucred *cred);
  258 
  259 /*
  260  * MAC Framework composition macros invoke all registered MAC policies for a
  261  * specific entry point.  They come in two forms: one which permits policies
  262  * to sleep/block, and another that does not.
  263  *
  264  * MAC_POLICY_CHECK performs the designated check by walking the policy
  265  * module list and checking with each as to how it feels about the request.
  266  * Note that it returns its value via 'error' in the scope of the caller.
  267  */
  268 #define MAC_POLICY_CHECK(check, args...) do {                           \
  269         struct mac_policy_conf *mpc;                                    \
  270                                                                         \
  271         error = 0;                                                      \
  272         LIST_FOREACH(mpc, &mac_static_policy_list, mpc_list) {          \
  273                 if (mpc->mpc_ops->mpo_ ## check != NULL)                \
  274                         error = mac_error_select(                       \
  275                             mpc->mpc_ops->mpo_ ## check (args),         \
  276                             error);                                     \
  277         }                                                               \
  278         if (!LIST_EMPTY(&mac_policy_list)) {                            \
  279                 mac_policy_slock_sleep();                               \
  280                 LIST_FOREACH(mpc, &mac_policy_list, mpc_list) {         \
  281                         if (mpc->mpc_ops->mpo_ ## check != NULL)        \
  282                                 error = mac_error_select(               \
  283                                     mpc->mpc_ops->mpo_ ## check (args), \
  284                                     error);                             \
  285                 }                                                       \
  286                 mac_policy_sunlock_sleep();                             \
  287         }                                                               \
  288 } while (0)
  289 
  290 #define MAC_POLICY_CHECK_NOSLEEP(check, args...) do {                   \
  291         struct mac_policy_conf *mpc;                                    \
  292                                                                         \
  293         error = 0;                                                      \
  294         LIST_FOREACH(mpc, &mac_static_policy_list, mpc_list) {          \
  295                 if (mpc->mpc_ops->mpo_ ## check != NULL)                \
  296                         error = mac_error_select(                       \
  297                             mpc->mpc_ops->mpo_ ## check (args),         \
  298                             error);                                     \
  299         }                                                               \
  300         if (!LIST_EMPTY(&mac_policy_list)) {                            \
  301                 struct rm_priotracker tracker;                          \
  302                                                                         \
  303                 mac_policy_slock_nosleep(&tracker);                     \
  304                 LIST_FOREACH(mpc, &mac_policy_list, mpc_list) {         \
  305                         if (mpc->mpc_ops->mpo_ ## check != NULL)        \
  306                                 error = mac_error_select(               \
  307                                     mpc->mpc_ops->mpo_ ## check (args), \
  308                                     error);                             \
  309                 }                                                       \
  310                 mac_policy_sunlock_nosleep(&tracker);                   \
  311         }                                                               \
  312 } while (0)
  313 
  314 /*
  315  * MAC_POLICY_GRANT performs the designated check by walking the policy
  316  * module list and checking with each as to how it feels about the request.
  317  * Unlike MAC_POLICY_CHECK, it grants if any policies return '', and
  318  * otherwise returns EPERM.  Note that it returns its value via 'error' in
  319  * the scope of the caller.
  320  */
  321 #define MAC_POLICY_GRANT_NOSLEEP(check, args...) do {                   \
  322         struct mac_policy_conf *mpc;                                    \
  323                                                                         \
  324         error = EPERM;                                                  \
  325         LIST_FOREACH(mpc, &mac_static_policy_list, mpc_list) {          \
  326                 if (mpc->mpc_ops->mpo_ ## check != NULL) {              \
  327                         if (mpc->mpc_ops->mpo_ ## check(args) == 0)     \
  328                                 error = 0;                              \
  329                 }                                                       \
  330         }                                                               \
  331         if (!LIST_EMPTY(&mac_policy_list)) {                            \
  332                 struct rm_priotracker tracker;                          \
  333                                                                         \
  334                 mac_policy_slock_nosleep(&tracker);                     \
  335                 LIST_FOREACH(mpc, &mac_policy_list, mpc_list) {         \
  336                         if (mpc->mpc_ops->mpo_ ## check != NULL) {      \
  337                                 if (mpc->mpc_ops->mpo_ ## check (args)  \
  338                                     == 0)                               \
  339                                         error = 0;                      \
  340                         }                                               \
  341                 }                                                       \
  342                 mac_policy_sunlock_nosleep(&tracker);                   \
  343         }                                                               \
  344 } while (0)
  345 
  346 /*
  347  * MAC_POLICY_BOOLEAN performs the designated boolean composition by walking
  348  * the module list, invoking each instance of the operation, and combining
  349  * the results using the passed C operator.  Note that it returns its value
  350  * via 'result' in the scope of the caller, which should be initialized by
  351  * the caller in a meaningful way to get a meaningful result.
  352  */
  353 #define MAC_POLICY_BOOLEAN(operation, composition, args...) do {        \
  354         struct mac_policy_conf *mpc;                                    \
  355                                                                         \
  356         LIST_FOREACH(mpc, &mac_static_policy_list, mpc_list) {          \
  357                 if (mpc->mpc_ops->mpo_ ## operation != NULL)            \
  358                         result = result composition                     \
  359                             mpc->mpc_ops->mpo_ ## operation (args);     \
  360         }                                                               \
  361         if (!LIST_EMPTY(&mac_policy_list)) {                            \
  362                 mac_policy_slock_sleep();                               \
  363                 LIST_FOREACH(mpc, &mac_policy_list, mpc_list) {         \
  364                         if (mpc->mpc_ops->mpo_ ## operation != NULL)    \
  365                                 result = result composition             \
  366                                     mpc->mpc_ops->mpo_ ## operation     \
  367                                     (args);                             \
  368                 }                                                       \
  369                 mac_policy_sunlock_sleep();                             \
  370         }                                                               \
  371 } while (0)
  372 
  373 #define MAC_POLICY_BOOLEAN_NOSLEEP(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                 struct rm_priotracker tracker;                          \
  383                                                                         \
  384                 mac_policy_slock_nosleep(&tracker);                     \
  385                 LIST_FOREACH(mpc, &mac_policy_list, mpc_list) {         \
  386                         if (mpc->mpc_ops->mpo_ ## operation != NULL)    \
  387                                 result = result composition             \
  388                                     mpc->mpc_ops->mpo_ ## operation     \
  389                                     (args);                             \
  390                 }                                                       \
  391                 mac_policy_sunlock_nosleep(&tracker);                   \
  392         }                                                               \
  393 } while (0)
  394 
  395 /*
  396  * MAC_POLICY_EXTERNALIZE queries each policy to see if it can generate an
  397  * externalized version of a label element by name.  Policies declare whether
  398  * they have matched a particular element name, parsed from the string by
  399  * MAC_POLICY_EXTERNALIZE, and an error is returned if any element is matched
  400  * by no policy.
  401  */
  402 #define MAC_POLICY_EXTERNALIZE(type, label, elementlist, outbuf,        \
  403     outbuflen) do {                                                     \
  404         int claimed, first, ignorenotfound, savedlen;                   \
  405         char *element_name, *element_temp;                              \
  406         struct sbuf sb;                                                 \
  407                                                                         \
  408         error = 0;                                                      \
  409         first = 1;                                                      \
  410         sbuf_new(&sb, outbuf, outbuflen, SBUF_FIXEDLEN);                \
  411         element_temp = elementlist;                                     \
  412         while ((element_name = strsep(&element_temp, ",")) != NULL) {   \
  413                 if (element_name[0] == '?') {                           \
  414                         element_name++;                                 \
  415                         ignorenotfound = 1;                             \
  416                  } else                                                 \
  417                         ignorenotfound = 0;                             \
  418                 savedlen = sbuf_len(&sb);                               \
  419                 if (first)                                              \
  420                         error = sbuf_printf(&sb, "%s/", element_name);  \
  421                 else                                                    \
  422                         error = sbuf_printf(&sb, ",%s/", element_name); \
  423                 if (error == -1) {                                      \
  424                         error = EINVAL; /* XXX: E2BIG? */               \
  425                         break;                                          \
  426                 }                                                       \
  427                 claimed = 0;                                            \
  428                 MAC_POLICY_CHECK(type ## _externalize_label, label,     \
  429                     element_name, &sb, &claimed);                       \
  430                 if (error)                                              \
  431                         break;                                          \
  432                 if (claimed == 0 && ignorenotfound) {                   \
  433                         /* Revert last label name. */                   \
  434                         sbuf_setpos(&sb, savedlen);                     \
  435                 } else if (claimed != 1) {                              \
  436                         error = EINVAL; /* XXX: ENOLABEL? */            \
  437                         break;                                          \
  438                 } else {                                                \
  439                         first = 0;                                      \
  440                 }                                                       \
  441         }                                                               \
  442         sbuf_finish(&sb);                                               \
  443 } while (0)
  444 
  445 /*
  446  * MAC_POLICY_INTERNALIZE presents parsed element names and data to each
  447  * policy to see if any is willing to claim it and internalize the label
  448  * data.  If no policies match, an error is returned.
  449  */
  450 #define MAC_POLICY_INTERNALIZE(type, label, instring) do {              \
  451         char *element, *element_name, *element_data;                    \
  452         int claimed;                                                    \
  453                                                                         \
  454         error = 0;                                                      \
  455         element = instring;                                             \
  456         while ((element_name = strsep(&element, ",")) != NULL) {        \
  457                 element_data = element_name;                            \
  458                 element_name = strsep(&element_data, "/");              \
  459                 if (element_data == NULL) {                             \
  460                         error = EINVAL;                                 \
  461                         break;                                          \
  462                 }                                                       \
  463                 claimed = 0;                                            \
  464                 MAC_POLICY_CHECK(type ## _internalize_label, label,     \
  465                     element_name, element_data, &claimed);              \
  466                 if (error)                                              \
  467                         break;                                          \
  468                 if (claimed != 1) {                                     \
  469                         /* XXXMAC: Another error here? */               \
  470                         error = EINVAL;                                 \
  471                         break;                                          \
  472                 }                                                       \
  473         }                                                               \
  474 } while (0)
  475 
  476 /*
  477  * MAC_POLICY_PERFORM performs the designated operation by walking the policy
  478  * module list and invoking that operation for each policy.
  479  */
  480 #define MAC_POLICY_PERFORM(operation, args...) do {                     \
  481         struct mac_policy_conf *mpc;                                    \
  482                                                                         \
  483         LIST_FOREACH(mpc, &mac_static_policy_list, mpc_list) {          \
  484                 if (mpc->mpc_ops->mpo_ ## operation != NULL)            \
  485                         mpc->mpc_ops->mpo_ ## operation (args);         \
  486         }                                                               \
  487         if (!LIST_EMPTY(&mac_policy_list)) {                            \
  488                 mac_policy_slock_sleep();                               \
  489                 LIST_FOREACH(mpc, &mac_policy_list, mpc_list) {         \
  490                         if (mpc->mpc_ops->mpo_ ## operation != NULL)    \
  491                                 mpc->mpc_ops->mpo_ ## operation (args); \
  492                 }                                                       \
  493                 mac_policy_sunlock_sleep();                             \
  494         }                                                               \
  495 } while (0)
  496 
  497 #define MAC_POLICY_PERFORM_NOSLEEP(operation, args...) do {             \
  498         struct mac_policy_conf *mpc;                                    \
  499                                                                         \
  500         LIST_FOREACH(mpc, &mac_static_policy_list, mpc_list) {          \
  501                 if (mpc->mpc_ops->mpo_ ## operation != NULL)            \
  502                         mpc->mpc_ops->mpo_ ## operation (args);         \
  503         }                                                               \
  504         if (!LIST_EMPTY(&mac_policy_list)) {                            \
  505                 struct rm_priotracker tracker;                          \
  506                                                                         \
  507                 mac_policy_slock_nosleep(&tracker);                     \
  508                 LIST_FOREACH(mpc, &mac_policy_list, mpc_list) {         \
  509                         if (mpc->mpc_ops->mpo_ ## operation != NULL)    \
  510                                 mpc->mpc_ops->mpo_ ## operation (args); \
  511                 }                                                       \
  512                 mac_policy_sunlock_nosleep(&tracker);                   \
  513         }                                                               \
  514 } while (0)
  515 
  516 #endif /* !_SECURITY_MAC_MAC_INTERNAL_H_ */

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