/*-
 * Copyright (c) 1999-2002, 2006, 2009, 2019 Robert N. M. Watson
 * Copyright (c) 2001 Ilmar S. Habibulin
 * Copyright (c) 2001-2004 Networks Associates Technology, Inc.
 * Copyright (c) 2006 nCircle Network Security, Inc.
 * Copyright (c) 2006 SPARTA, Inc.
 * Copyright (c) 2009 Apple, Inc.
 * All rights reserved.
 *
 * This software was developed by Robert Watson and Ilmar Habibulin for the
 * TrustedBSD Project.
 *
 * This software was developed for the FreeBSD Project in part by Network
 * Associates Laboratories, the Security Research Division of Network
 * Associates, Inc. under DARPA/SPAWAR contract N66001-01-C-8035 ("CBOSS"),
 * as part of the DARPA CHATS research program.
 *
 * This software was developed by Robert N. M. Watson for the TrustedBSD
 * Project under contract to nCircle Network Security, Inc.
 *
 * This software was enhanced by SPARTA ISSO under SPAWAR contract
 * N66001-04-C-6019 ("SEFOS").
 *
 * This software was developed at the University of Cambridge Computer
 * Laboratory with support from a grant from Google, Inc. 
 *
 * Redistribution and use in source and binary forms, with or without
 * modification, are permitted provided that the following conditions
 * are met:
 * 1. Redistributions of source code must retain the above copyright
 *    notice, this list of conditions and the following disclaimer.
 * 2. Redistributions in binary form must reproduce the above copyright
 *    notice, this list of conditions and the following disclaimer in the
 *    documentation and/or other materials provided with the distribution.
 *
 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
 * ARE DISCLAIMED.  IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
 * SUCH DAMAGE.
 */

#ifndef _SECURITY_MAC_MAC_INTERNAL_H_
#define _SECURITY_MAC_MAC_INTERNAL_H_

#ifndef _KERNEL
#error "no user-serviceable parts inside"
#endif

#include <sys/lock.h>
#include <sys/rmlock.h>

/*
 * MAC Framework SDT DTrace probe namespace, macros for declaring entry
 * point probes, macros for invoking them.
 */
#ifdef SDT_PROVIDER_DECLARE
SDT_PROVIDER_DECLARE(mac);              /* MAC Framework-level events. */
SDT_PROVIDER_DECLARE(mac_framework);    /* Entry points to MAC. */

#define MAC_CHECK_PROBE_DEFINE5(name, arg0, arg1, arg2, arg3, arg4)     \
        SDT_PROBE_DEFINE6(mac_framework, , name, mac__check__err,       \
            "int", arg0, arg1, arg2, arg3, arg4);                       \
        SDT_PROBE_DEFINE6(mac_framework, , name, mac__check__ok,        \
            "int", arg0, arg1, arg2, arg3, arg4);

#define MAC_CHECK_PROBE_DEFINE4(name, arg0, arg1, arg2, arg3)           \
        SDT_PROBE_DEFINE5(mac_framework, , name, mac__check__err,       \
            "int", arg0, arg1, arg2, arg3);                             \
        SDT_PROBE_DEFINE5(mac_framework, , name, mac__check__ok,        \
            "int", arg0, arg1, arg2, arg3);

#define MAC_CHECK_PROBE_DEFINE3(name, arg0, arg1, arg2)                 \
        SDT_PROBE_DEFINE4(mac_framework, , name, mac__check__err,       \
            "int", arg0, arg1, arg2);                                   \
        SDT_PROBE_DEFINE4(mac_framework, , name, mac__check__ok,        \
            "int", arg0, arg1, arg2);

#define MAC_CHECK_PROBE_DEFINE2(name, arg0, arg1)                       \
        SDT_PROBE_DEFINE3(mac_framework, , name, mac__check__err,       \
            "int", arg0, arg1);                                         \
        SDT_PROBE_DEFINE3(mac_framework, , name, mac__check__ok,        \
            "int", arg0, arg1);

#define MAC_CHECK_PROBE_DEFINE1(name, arg0)                             \
        SDT_PROBE_DEFINE2(mac_framework, , name, mac__check__err,       \
            "int", arg0);                                               \
        SDT_PROBE_DEFINE2(mac_framework, , name, mac__check__ok,        \
            "int", arg0);

#define MAC_CHECK_PROBE5(name, error, arg0, arg1, arg2, arg3, arg4) do { \
        if (SDT_PROBES_ENABLED()) {                                     \
                if (error) {                                            \
                        SDT_PROBE6(mac_framework, , name, mac__check__err,\
                            error, arg0, arg1, arg2, arg3, arg4);       \
                } else {                                                \
                        SDT_PROBE6(mac_framework, , name, mac__check__ok,\
                            0, arg0, arg1, arg2, arg3, arg4);           \
                }                                                       \
        }                                                               \
} while (0)

#define MAC_CHECK_PROBE4(name, error, arg0, arg1, arg2, arg3)           \
        MAC_CHECK_PROBE5(name, error, arg0, arg1, arg2, arg3, 0)
#define MAC_CHECK_PROBE3(name, error, arg0, arg1, arg2)                 \
        MAC_CHECK_PROBE4(name, error, arg0, arg1, arg2, 0)
#define MAC_CHECK_PROBE2(name, error, arg0, arg1)                       \
        MAC_CHECK_PROBE3(name, error, arg0, arg1, 0)
#define MAC_CHECK_PROBE1(name, error, arg0)                             \
        MAC_CHECK_PROBE2(name, error, arg0, 0)
#endif

#define MAC_GRANT_PROBE_DEFINE2(name, arg0, arg1)                       \
        SDT_PROBE_DEFINE3(mac_framework, , name, mac__grant__err,       \
            "int", arg0, arg1);                                         \
        SDT_PROBE_DEFINE3(mac_framework, , name, mac__grant__ok,        \
            "int", arg0, arg1);

#define MAC_GRANT_PROBE2(name, error, arg0, arg1)       do {            \
        if (SDT_PROBES_ENABLED()) {                                     \
                if (error) {                                            \
                        SDT_PROBE3(mac_framework, , name, mac__grant__err,\
                            error, arg0, arg1);                         \
                } else {                                                \
                        SDT_PROBE3(mac_framework, , name, mac__grant__ok,\
                            error, arg0, arg1);                         \
                }                                                       \
        }                                                               \
} while (0)

/*
 * MAC Framework global types and typedefs.
 */
LIST_HEAD(mac_policy_list_head, mac_policy_conf);
#ifdef MALLOC_DECLARE
MALLOC_DECLARE(M_MACTEMP);
#endif

/*
 * MAC labels -- in-kernel storage format.
 *
 * In general, struct label pointers are embedded in kernel data structures
 * representing objects that may be labeled (and protected).  Struct label is
 * opaque to both kernel services that invoke the MAC Framework and MAC
 * policy modules.  In particular, we do not wish to encode the layout of the
 * label structure into any ABIs.  Historically, the slot array contained
 * unions of {long, void} but now contains uintptr_t.
 */
#define MAC_MAX_SLOTS   4
#define MAC_FLAG_INITIALIZED    0x0000001       /* Is initialized for use. */
struct label {
        int             l_flags;
        intptr_t        l_perpolicy[MAC_MAX_SLOTS];
};

/*
 * Flags for mac_labeled, a bitmask of object types need across the union of
 * all policies currently registered with the MAC Framework, used to key
 * whether or not labels are allocated and constructors for the type are
 * invoked.
 */
#define MPC_OBJECT_CRED                 0x0000000000000001
#define MPC_OBJECT_PROC                 0x0000000000000002
#define MPC_OBJECT_VNODE                0x0000000000000004
#define MPC_OBJECT_INPCB                0x0000000000000008
#define MPC_OBJECT_SOCKET               0x0000000000000010
#define MPC_OBJECT_DEVFS                0x0000000000000020
#define MPC_OBJECT_MBUF                 0x0000000000000040
#define MPC_OBJECT_IPQ                  0x0000000000000080
#define MPC_OBJECT_IFNET                0x0000000000000100
#define MPC_OBJECT_BPFDESC              0x0000000000000200
#define MPC_OBJECT_PIPE                 0x0000000000000400
#define MPC_OBJECT_MOUNT                0x0000000000000800
#define MPC_OBJECT_POSIXSEM             0x0000000000001000
#define MPC_OBJECT_POSIXSHM             0x0000000000002000
#define MPC_OBJECT_SYSVMSG              0x0000000000004000
#define MPC_OBJECT_SYSVMSQ              0x0000000000008000
#define MPC_OBJECT_SYSVSEM              0x0000000000010000
#define MPC_OBJECT_SYSVSHM              0x0000000000020000
#define MPC_OBJECT_SYNCACHE             0x0000000000040000
#define MPC_OBJECT_IP6Q                 0x0000000000080000
#define MPC_OBJECT_PRISON               0x0000000000100000

/*
 * MAC Framework global variables.
 */
extern struct mac_policy_list_head      mac_policy_list;
extern struct mac_policy_list_head      mac_static_policy_list;
extern u_int                            mac_policy_count;
extern uint64_t                         mac_labeled;
extern struct mtx                       mac_ifnet_mtx;

/*
 * MAC Framework infrastructure functions.
 */
int     mac_error_select(int error1, int error2);

void    mac_policy_slock_nosleep(struct rm_priotracker *tracker);
void    mac_policy_slock_sleep(void);
void    mac_policy_sunlock_nosleep(struct rm_priotracker *tracker);
void    mac_policy_sunlock_sleep(void);

struct label    *mac_labelzone_alloc(int flags);
void             mac_labelzone_free(struct label *label);
void             mac_labelzone_init(void);

void    mac_init_label(struct label *label);
void    mac_destroy_label(struct label *label);
int     mac_check_structmac_consistent(const struct mac *mac);
int     mac_allocate_slot(void);

/*
 * Lock ifnets to protect labels only if ifnet labels are in use.
 */
#define MAC_IFNET_LOCK(ifp, locked)     do {                            \
        if (mac_labeled & MPC_OBJECT_IFNET) {                           \
                mtx_lock(&mac_ifnet_mtx);                               \
                locked = 1;                                             \
        } else {                                                        \
                locked = 0;                                             \
        }                                                               \
} while (0)

#define MAC_IFNET_UNLOCK(ifp, locked)   do {                            \
        if (locked) {                                                   \
                mtx_unlock(&mac_ifnet_mtx);                             \
                locked = 0;                                             \
        }                                                               \
} while (0)

/*
 * MAC Framework per-object type functions.  It's not yet clear how the
 * namespaces, etc, should work for these, so for now, sort by object type.
 */
struct label    *mac_cred_label_alloc(void);
void             mac_cred_label_free(struct label *label);
struct label    *mac_pipe_label_alloc(void);
void             mac_pipe_label_free(struct label *label);
struct label    *mac_prison_label_alloc(int flags);
void             mac_prison_label_free(struct label *label);
struct label    *mac_socket_label_alloc(int flag);
void             mac_socket_label_free(struct label *label);
void             mac_socketpeer_label_free(struct label *label);
struct label    *mac_vnode_label_alloc(void);
void             mac_vnode_label_free(struct label *label);

int     mac_cred_check_relabel(struct ucred *cred, struct label *newlabel);
int     mac_cred_externalize_label(struct label *label, char *elements,
            char *outbuf, size_t outbuflen);
int     mac_cred_internalize_label(struct label *label, char *string);
void    mac_cred_relabel(struct ucred *cred, struct label *newlabel);

struct label    *mac_mbuf_to_label(struct mbuf *m);

void    mac_pipe_copy_label(struct label *src, struct label *dest);
int     mac_pipe_externalize_label(struct label *label, char *elements,
            char *outbuf, size_t outbuflen);
int     mac_pipe_internalize_label(struct label *label, char *string);

int     mac_prison_label_set(struct ucred *cred, struct prison *pr,
            struct label *label);
int     mac_prison_check_relabel(struct ucred *cred, struct prison *pr,
            struct label *newlabel);
void    mac_prison_copy_label(struct label *src, struct label *dest);
int     mac_prison_externalize_label(struct label *label, char *elements,
            char *outbuf, size_t outbuflen);
int     mac_prison_internalize_label(struct label *label, char *string);
void    mac_prison_relabel(struct ucred *cred, struct prison *pr,
            struct label *newlabel);

int     mac_socket_label_set(struct ucred *cred, struct socket *so,
            struct label *label);
void    mac_socket_copy_label(struct label *src, struct label *dest);
int     mac_socket_externalize_label(struct label *label, char *elements,
            char *outbuf, size_t outbuflen);
int     mac_socket_internalize_label(struct label *label, char *string);

int     mac_vnode_externalize_label(struct label *label, char *elements,
            char *outbuf, size_t outbuflen);
int     mac_vnode_internalize_label(struct label *label, char *string);
void    mac_vnode_check_mmap_downgrade(struct ucred *cred, struct vnode *vp,
            int *prot);
int     vn_setlabel(struct vnode *vp, struct label *intlabel,
            struct ucred *cred);

/*
 * MAC Framework composition macros invoke all registered MAC policies for a
 * specific entry point.  They come in two forms: one which permits policies
 * to sleep/block, and another that does not.
 *
 * MAC_POLICY_CHECK performs the designated check by walking the policy
 * module list and checking with each as to how it feels about the request.
 * Note that it returns its value via 'error' in the scope of the caller.
 */
#define MAC_POLICY_CHECK(check, args...) do {                           \
        struct mac_policy_conf *mpc;                                    \
                                                                        \
        error = 0;                                                      \
        LIST_FOREACH(mpc, &mac_static_policy_list, mpc_list) {          \
                if (mpc->mpc_ops->mpo_ ## check != NULL)                \
                        error = mac_error_select(                       \
                            mpc->mpc_ops->mpo_ ## check (args),         \
                            error);                                     \
        }                                                               \
        if (!LIST_EMPTY(&mac_policy_list)) {                            \
                mac_policy_slock_sleep();                               \
                LIST_FOREACH(mpc, &mac_policy_list, mpc_list) {         \
                        if (mpc->mpc_ops->mpo_ ## check != NULL)        \
                                error = mac_error_select(               \
                                    mpc->mpc_ops->mpo_ ## check (args), \
                                    error);                             \
                }                                                       \
                mac_policy_sunlock_sleep();                             \
        }                                                               \
} while (0)

#define MAC_POLICY_CHECK_NOSLEEP(check, args...) do {                   \
        struct mac_policy_conf *mpc;                                    \
                                                                        \
        error = 0;                                                      \
        LIST_FOREACH(mpc, &mac_static_policy_list, mpc_list) {          \
                if (mpc->mpc_ops->mpo_ ## check != NULL)                \
                        error = mac_error_select(                       \
                            mpc->mpc_ops->mpo_ ## check (args),         \
                            error);                                     \
        }                                                               \
        if (!LIST_EMPTY(&mac_policy_list)) {                            \
                struct rm_priotracker tracker;                          \
                                                                        \
                mac_policy_slock_nosleep(&tracker);                     \
                LIST_FOREACH(mpc, &mac_policy_list, mpc_list) {         \
                        if (mpc->mpc_ops->mpo_ ## check != NULL)        \
                                error = mac_error_select(               \
                                    mpc->mpc_ops->mpo_ ## check (args), \
                                    error);                             \
                }                                                       \
                mac_policy_sunlock_nosleep(&tracker);                   \
        }                                                               \
} while (0)

/*
 * MAC_POLICY_GRANT performs the designated check by walking the policy
 * module list and checking with each as to how it feels about the request.
 * Unlike MAC_POLICY_CHECK, it grants if any policies return '0', and
 * otherwise returns EPERM.  Note that it returns its value via 'error' in
 * the scope of the caller.
 */
#define MAC_POLICY_GRANT_NOSLEEP(check, args...) do {                   \
        struct mac_policy_conf *mpc;                                    \
                                                                        \
        error = EPERM;                                                  \
        LIST_FOREACH(mpc, &mac_static_policy_list, mpc_list) {          \
                if (mpc->mpc_ops->mpo_ ## check != NULL) {              \
                        if (mpc->mpc_ops->mpo_ ## check(args) == 0)     \
                                error = 0;                              \
                }                                                       \
        }                                                               \
        if (!LIST_EMPTY(&mac_policy_list)) {                            \
                struct rm_priotracker tracker;                          \
                                                                        \
                mac_policy_slock_nosleep(&tracker);                     \
                LIST_FOREACH(mpc, &mac_policy_list, mpc_list) {         \
                        if (mpc->mpc_ops->mpo_ ## check != NULL) {      \
                                if (mpc->mpc_ops->mpo_ ## check (args)  \
                                    == 0)                               \
                                        error = 0;                      \
                        }                                               \
                }                                                       \
                mac_policy_sunlock_nosleep(&tracker);                   \
        }                                                               \
} while (0)

/*
 * MAC_POLICY_BOOLEAN performs the designated boolean composition by walking
 * the module list, invoking each instance of the operation, and combining
 * the results using the passed C operator.  Note that it returns its value
 * via 'result' in the scope of the caller, which should be initialized by
 * the caller in a meaningful way to get a meaningful result.
 */
#define MAC_POLICY_BOOLEAN(operation, composition, args...) do {        \
        struct mac_policy_conf *mpc;                                    \
                                                                        \
        LIST_FOREACH(mpc, &mac_static_policy_list, mpc_list) {          \
                if (mpc->mpc_ops->mpo_ ## operation != NULL)            \
                        result = result composition                     \
                            mpc->mpc_ops->mpo_ ## operation (args);     \
        }                                                               \
        if (!LIST_EMPTY(&mac_policy_list)) {                            \
                mac_policy_slock_sleep();                               \
                LIST_FOREACH(mpc, &mac_policy_list, mpc_list) {         \
                        if (mpc->mpc_ops->mpo_ ## operation != NULL)    \
                                result = result composition             \
                                    mpc->mpc_ops->mpo_ ## operation     \
                                    (args);                             \
                }                                                       \
                mac_policy_sunlock_sleep();                             \
        }                                                               \
} while (0)

#define MAC_POLICY_BOOLEAN_NOSLEEP(operation, composition, args...) do {\
        struct mac_policy_conf *mpc;                                    \
                                                                        \
        LIST_FOREACH(mpc, &mac_static_policy_list, mpc_list) {          \
                if (mpc->mpc_ops->mpo_ ## operation != NULL)            \
                        result = result composition                     \
                            mpc->mpc_ops->mpo_ ## operation (args);     \
        }                                                               \
        if (!LIST_EMPTY(&mac_policy_list)) {                            \
                struct rm_priotracker tracker;                          \
                                                                        \
                mac_policy_slock_nosleep(&tracker);                     \
                LIST_FOREACH(mpc, &mac_policy_list, mpc_list) {         \
                        if (mpc->mpc_ops->mpo_ ## operation != NULL)    \
                                result = result composition             \
                                    mpc->mpc_ops->mpo_ ## operation     \
                                    (args);                             \
                }                                                       \
                mac_policy_sunlock_nosleep(&tracker);                   \
        }                                                               \
} while (0)

/*
 * MAC_POLICY_EXTERNALIZE queries each policy to see if it can generate an
 * externalized version of a label element by name.  Policies declare whether
 * they have matched a particular element name, parsed from the string by
 * MAC_POLICY_EXTERNALIZE, and an error is returned if any element is matched
 * by no policy.
 */
#define MAC_POLICY_EXTERNALIZE(type, label, elementlist, outbuf,        \
    outbuflen) do {                                                     \
        int claimed, first, ignorenotfound, savedlen;                   \
        char *element_name, *element_temp;                              \
        struct sbuf sb;                                                 \
                                                                        \
        error = 0;                                                      \
        first = 1;                                                      \
        sbuf_new(&sb, outbuf, outbuflen, SBUF_FIXEDLEN);                \
        element_temp = elementlist;                                     \
        while ((element_name = strsep(&element_temp, ",")) != NULL) {   \
                if (element_name[0] == '?') {                           \
                        element_name++;                                 \
                        ignorenotfound = 1;                             \
                 } else                                                 \
                        ignorenotfound = 0;                             \
                savedlen = sbuf_len(&sb);                               \
                if (first)                                              \
                        error = sbuf_printf(&sb, "%s/", element_name);  \
                else                                                    \
                        error = sbuf_printf(&sb, ",%s/", element_name); \
                if (error == -1) {                                      \
                        error = EINVAL; /* XXX: E2BIG? */               \
                        break;                                          \
                }                                                       \
                claimed = 0;                                            \
                MAC_POLICY_CHECK(type ## _externalize_label, label,     \
                    element_name, &sb, &claimed);                       \
                if (error)                                              \
                        break;                                          \
                if (claimed == 0 && ignorenotfound) {                   \
                        /* Revert last label name. */                   \
                        sbuf_setpos(&sb, savedlen);                     \
                } else if (claimed != 1) {                              \
                        error = EINVAL; /* XXX: ENOLABEL? */            \
                        break;                                          \
                } else {                                                \
                        first = 0;                                      \
                }                                                       \
        }                                                               \
        sbuf_finish(&sb);                                               \
} while (0)

/*
 * MAC_POLICY_INTERNALIZE presents parsed element names and data to each
 * policy to see if any is willing to claim it and internalize the label
 * data.  If no policies match, an error is returned.
 */
#define MAC_POLICY_INTERNALIZE(type, label, instring) do {              \
        char *element, *element_name, *element_data;                    \
        int claimed;                                                    \
                                                                        \
        error = 0;                                                      \
        element = instring;                                             \
        while ((element_name = strsep(&element, ",")) != NULL) {        \
                element_data = element_name;                            \
                element_name = strsep(&element_data, "/");              \
                if (element_data == NULL) {                             \
                        error = EINVAL;                                 \
                        break;                                          \
                }                                                       \
                claimed = 0;                                            \
                MAC_POLICY_CHECK(type ## _internalize_label, label,     \
                    element_name, element_data, &claimed);              \
                if (error)                                              \
                        break;                                          \
                if (claimed != 1) {                                     \
                        /* XXXMAC: Another error here? */               \
                        error = EINVAL;                                 \
                        break;                                          \
                }                                                       \
        }                                                               \
} while (0)

/*
 * MAC_POLICY_PERFORM performs the designated operation by walking the policy
 * module list and invoking that operation for each policy.
 */
#define MAC_POLICY_PERFORM(operation, args...) do {                     \
        struct mac_policy_conf *mpc;                                    \
                                                                        \
        LIST_FOREACH(mpc, &mac_static_policy_list, mpc_list) {          \
                if (mpc->mpc_ops->mpo_ ## operation != NULL)            \
                        mpc->mpc_ops->mpo_ ## operation (args);         \
        }                                                               \
        if (!LIST_EMPTY(&mac_policy_list)) {                            \
                mac_policy_slock_sleep();                               \
                LIST_FOREACH(mpc, &mac_policy_list, mpc_list) {         \
                        if (mpc->mpc_ops->mpo_ ## operation != NULL)    \
                                mpc->mpc_ops->mpo_ ## operation (args); \
                }                                                       \
                mac_policy_sunlock_sleep();                             \
        }                                                               \
} while (0)

#define MAC_POLICY_PERFORM_NOSLEEP(operation, args...) do {             \
        struct mac_policy_conf *mpc;                                    \
                                                                        \
        LIST_FOREACH(mpc, &mac_static_policy_list, mpc_list) {          \
                if (mpc->mpc_ops->mpo_ ## operation != NULL)            \
                        mpc->mpc_ops->mpo_ ## operation (args);         \
        }                                                               \
        if (!LIST_EMPTY(&mac_policy_list)) {                            \
                struct rm_priotracker tracker;                          \
                                                                        \
                mac_policy_slock_nosleep(&tracker);                     \
                LIST_FOREACH(mpc, &mac_policy_list, mpc_list) {         \
                        if (mpc->mpc_ops->mpo_ ## operation != NULL)    \
                                mpc->mpc_ops->mpo_ ## operation (args); \
                }                                                       \
                mac_policy_sunlock_nosleep(&tracker);                   \
        }                                                               \
} while (0)

#endif /* !_SECURITY_MAC_MAC_INTERNAL_H_ */