/*-
 * SPDX-License-Identifier: BSD-2-Clause
 *
 * Copyright (c) 2008-2010, 2015 Robert N. M. Watson
 * Copyright (c) 2012 FreeBSD Foundation
 * All rights reserved.
 *
 * This software was developed at the University of Cambridge Computer
 * Laboratory with support from a grant from Google, Inc.
 *
 * Portions of this software were developed by Pawel Jakub Dawidek under
 * sponsorship from the FreeBSD Foundation.
 *
 * 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.
 */

/*
 * Definitions for FreeBSD capabilities facility.
 */
#ifndef _SYS_CAPSICUM_H_
#define _SYS_CAPSICUM_H_

#include <sys/param.h>

#include <sys/caprights.h>
#include <sys/file.h>
#include <sys/fcntl.h>

#ifndef _KERNEL
#include <stdbool.h>
#endif

#define CAPRIGHT(idx, bit)      ((1ULL << (57 + (idx))) | (bit))

/*
 * Possible rights on capabilities.
 *
 * Notes:
 * Some system calls don't require a capability in order to perform an
 * operation on an fd.  These include: close, dup, dup2.
 *
 * sendfile is authorized using CAP_READ on the file and CAP_WRITE on the
 * socket.
 *
 * mmap() and aio*() system calls will need special attention as they may
 * involve reads or writes depending a great deal on context.
 */

/* INDEX 0 */

/*
 * General file I/O.
 */
/* Allows for openat(O_RDONLY), read(2), readv(2). */
#define CAP_READ                CAPRIGHT(0, 0x0000000000000001ULL)
/* Allows for openat(O_WRONLY | O_APPEND), write(2), writev(2). */
#define CAP_WRITE               CAPRIGHT(0, 0x0000000000000002ULL)
/* Allows for lseek(fd, 0, SEEK_CUR). */
#define CAP_SEEK_TELL           CAPRIGHT(0, 0x0000000000000004ULL)
/* Allows for lseek(2). */
#define CAP_SEEK                (CAP_SEEK_TELL | 0x0000000000000008ULL)
/* Allows for aio_read(2), pread(2), preadv(2). */
#define CAP_PREAD               (CAP_SEEK | CAP_READ)
/*
 * Allows for aio_write(2), openat(O_WRONLY) (without O_APPEND), pwrite(2),
 * pwritev(2).
 */
#define CAP_PWRITE              (CAP_SEEK | CAP_WRITE)
/* Allows for mmap(PROT_NONE). */
#define CAP_MMAP                CAPRIGHT(0, 0x0000000000000010ULL)
/* Allows for mmap(PROT_READ). */
#define CAP_MMAP_R              (CAP_MMAP | CAP_SEEK | CAP_READ)
/* Allows for mmap(PROT_WRITE). */
#define CAP_MMAP_W              (CAP_MMAP | CAP_SEEK | CAP_WRITE)
/* Allows for mmap(PROT_EXEC). */
#define CAP_MMAP_X              (CAP_MMAP | CAP_SEEK | 0x0000000000000020ULL)
/* Allows for mmap(PROT_READ | PROT_WRITE). */
#define CAP_MMAP_RW             (CAP_MMAP_R | CAP_MMAP_W)
/* Allows for mmap(PROT_READ | PROT_EXEC). */
#define CAP_MMAP_RX             (CAP_MMAP_R | CAP_MMAP_X)
/* Allows for mmap(PROT_WRITE | PROT_EXEC). */
#define CAP_MMAP_WX             (CAP_MMAP_W | CAP_MMAP_X)
/* Allows for mmap(PROT_READ | PROT_WRITE | PROT_EXEC). */
#define CAP_MMAP_RWX            (CAP_MMAP_R | CAP_MMAP_W | CAP_MMAP_X)
/* Allows for openat(O_CREAT). */
#define CAP_CREATE              CAPRIGHT(0, 0x0000000000000040ULL)
/* Allows for openat(O_EXEC) and fexecve(2) in turn. */
#define CAP_FEXECVE             CAPRIGHT(0, 0x0000000000000080ULL)
/* Allows for openat(O_SYNC), openat(O_FSYNC), fsync(2), aio_fsync(2). */
#define CAP_FSYNC               CAPRIGHT(0, 0x0000000000000100ULL)
/* Allows for openat(O_TRUNC), ftruncate(2). */
#define CAP_FTRUNCATE           CAPRIGHT(0, 0x0000000000000200ULL)

/* Lookups - used to constrain *at() calls. */
#define CAP_LOOKUP              CAPRIGHT(0, 0x0000000000000400ULL)

/* VFS methods. */
/* Allows for fchdir(2). */
#define CAP_FCHDIR              CAPRIGHT(0, 0x0000000000000800ULL)
/* Allows for fchflags(2). */
#define CAP_FCHFLAGS            CAPRIGHT(0, 0x0000000000001000ULL)
/* Allows for fchflags(2) and chflagsat(2). */
#define CAP_CHFLAGSAT           (CAP_FCHFLAGS | CAP_LOOKUP)
/* Allows for fchmod(2). */
#define CAP_FCHMOD              CAPRIGHT(0, 0x0000000000002000ULL)
/* Allows for fchmod(2) and fchmodat(2). */
#define CAP_FCHMODAT            (CAP_FCHMOD | CAP_LOOKUP)
/* Allows for fchown(2). */
#define CAP_FCHOWN              CAPRIGHT(0, 0x0000000000004000ULL)
/* Allows for fchown(2) and fchownat(2). */
#define CAP_FCHOWNAT            (CAP_FCHOWN | CAP_LOOKUP)
/* Allows for fcntl(2). */
#define CAP_FCNTL               CAPRIGHT(0, 0x0000000000008000ULL)
/*
 * Allows for flock(2), openat(O_SHLOCK), openat(O_EXLOCK),
 * fcntl(F_SETLK_REMOTE), fcntl(F_SETLKW), fcntl(F_SETLK), fcntl(F_GETLK).
 */
#define CAP_FLOCK               CAPRIGHT(0, 0x0000000000010000ULL)
/* Allows for fpathconf(2). */
#define CAP_FPATHCONF           CAPRIGHT(0, 0x0000000000020000ULL)
/* Allows for UFS background-fsck operations. */
#define CAP_FSCK                CAPRIGHT(0, 0x0000000000040000ULL)
/* Allows for fstat(2). */
#define CAP_FSTAT               CAPRIGHT(0, 0x0000000000080000ULL)
/* Allows for fstat(2), fstatat(2) and faccessat(2). */
#define CAP_FSTATAT             (CAP_FSTAT | CAP_LOOKUP)
/* Allows for fstatfs(2). */
#define CAP_FSTATFS             CAPRIGHT(0, 0x0000000000100000ULL)
/* Allows for futimens(2) and futimes(2). */
#define CAP_FUTIMES             CAPRIGHT(0, 0x0000000000200000ULL)
/* Allows for futimens(2), futimes(2), futimesat(2) and utimensat(2). */
#define CAP_FUTIMESAT           (CAP_FUTIMES | CAP_LOOKUP)
/* Allows for linkat(2) (target directory descriptor). */
#define CAP_LINKAT_TARGET       (CAP_LOOKUP | 0x0000000000400000ULL)
/* Allows for mkdirat(2). */
#define CAP_MKDIRAT             (CAP_LOOKUP | 0x0000000000800000ULL)
/* Allows for mkfifoat(2). */
#define CAP_MKFIFOAT            (CAP_LOOKUP | 0x0000000001000000ULL)
/* Allows for mknodat(2). */
#define CAP_MKNODAT             (CAP_LOOKUP | 0x0000000002000000ULL)
/* Allows for renameat(2) (source directory descriptor). */
#define CAP_RENAMEAT_SOURCE     (CAP_LOOKUP | 0x0000000004000000ULL)
/* Allows for symlinkat(2). */
#define CAP_SYMLINKAT           (CAP_LOOKUP | 0x0000000008000000ULL)
/*
 * Allows for unlinkat(2) and renameat(2) if destination object exists and
 * will be removed.
 */
#define CAP_UNLINKAT            (CAP_LOOKUP | 0x0000000010000000ULL)

/* Socket operations. */
/* Allows for accept(2) and accept4(2). */
#define CAP_ACCEPT              CAPRIGHT(0, 0x0000000020000000ULL)
/* Allows for bind(2). */
#define CAP_BIND                CAPRIGHT(0, 0x0000000040000000ULL)
/* Allows for connect(2). */
#define CAP_CONNECT             CAPRIGHT(0, 0x0000000080000000ULL)
/* Allows for getpeername(2). */
#define CAP_GETPEERNAME         CAPRIGHT(0, 0x0000000100000000ULL)
/* Allows for getsockname(2). */
#define CAP_GETSOCKNAME         CAPRIGHT(0, 0x0000000200000000ULL)
/* Allows for getsockopt(2). */
#define CAP_GETSOCKOPT          CAPRIGHT(0, 0x0000000400000000ULL)
/* Allows for listen(2). */
#define CAP_LISTEN              CAPRIGHT(0, 0x0000000800000000ULL)
/* Allows for sctp_peeloff(2). */
#define CAP_PEELOFF             CAPRIGHT(0, 0x0000001000000000ULL)
#define CAP_RECV                CAP_READ
#define CAP_SEND                CAP_WRITE
/* Allows for setsockopt(2). */
#define CAP_SETSOCKOPT          CAPRIGHT(0, 0x0000002000000000ULL)
/* Allows for shutdown(2). */
#define CAP_SHUTDOWN            CAPRIGHT(0, 0x0000004000000000ULL)

/* Allows for bindat(2) on a directory descriptor. */
#define CAP_BINDAT              (CAP_LOOKUP | 0x0000008000000000ULL)
/* Allows for connectat(2) on a directory descriptor. */
#define CAP_CONNECTAT           (CAP_LOOKUP | 0x0000010000000000ULL)

/* Allows for linkat(2) (source directory descriptor). */
#define CAP_LINKAT_SOURCE       (CAP_LOOKUP | 0x0000020000000000ULL)
/* Allows for renameat(2) (target directory descriptor). */
#define CAP_RENAMEAT_TARGET     (CAP_LOOKUP | 0x0000040000000000ULL)

/* Allows for fchroot(2). */
#define CAP_FCHROOT             CAPRIGHT(0, 0x0000080000000000ULL)

#define CAP_SOCK_CLIENT \
        (CAP_CONNECT | CAP_GETPEERNAME | CAP_GETSOCKNAME | CAP_GETSOCKOPT | \
         CAP_PEELOFF | CAP_RECV | CAP_SEND | CAP_SETSOCKOPT | CAP_SHUTDOWN)
#define CAP_SOCK_SERVER \
        (CAP_ACCEPT | CAP_BIND | CAP_GETPEERNAME | CAP_GETSOCKNAME | \
         CAP_GETSOCKOPT | CAP_LISTEN | CAP_PEELOFF | CAP_RECV | CAP_SEND | \
         CAP_SETSOCKOPT | CAP_SHUTDOWN)

/* All used bits for index 0. */
#define CAP_ALL0                CAPRIGHT(0, 0x00000FFFFFFFFFFFULL)

/* Available bits for index 0. */
#define CAP_UNUSED0_57          CAPRIGHT(0, 0x0100000000000000ULL)

/* INDEX 1 */

/* Mandatory Access Control. */
/* Allows for mac_get_fd(3). */
#define CAP_MAC_GET             CAPRIGHT(1, 0x0000000000000001ULL)
/* Allows for mac_set_fd(3). */
#define CAP_MAC_SET             CAPRIGHT(1, 0x0000000000000002ULL)

/* Methods on semaphores. */
#define CAP_SEM_GETVALUE        CAPRIGHT(1, 0x0000000000000004ULL)
#define CAP_SEM_POST            CAPRIGHT(1, 0x0000000000000008ULL)
#define CAP_SEM_WAIT            CAPRIGHT(1, 0x0000000000000010ULL)

/* Allows select(2) and poll(2) on descriptor. */
#define CAP_EVENT               CAPRIGHT(1, 0x0000000000000020ULL)
/* Allows for kevent(2) on kqueue descriptor with eventlist != NULL. */
#define CAP_KQUEUE_EVENT        CAPRIGHT(1, 0x0000000000000040ULL)

/* Strange and powerful rights that should not be given lightly. */
/* Allows for ioctl(2). */
#define CAP_IOCTL               CAPRIGHT(1, 0x0000000000000080ULL)
#define CAP_TTYHOOK             CAPRIGHT(1, 0x0000000000000100ULL)

/* Process management via process descriptors. */
/* Allows for pdgetpid(2). */
#define CAP_PDGETPID            CAPRIGHT(1, 0x0000000000000200ULL)
/*
 * Allows for pdwait4(2).
 *
 * XXX: this constant was imported unused, but is targeted to be implemented
 *      in the future (bug 235871).
 */
#define CAP_PDWAIT              CAPRIGHT(1, 0x0000000000000400ULL)
/* Allows for pdkill(2). */
#define CAP_PDKILL              CAPRIGHT(1, 0x0000000000000800ULL)

/* Extended attributes. */
/* Allows for extattr_delete_fd(2). */
#define CAP_EXTATTR_DELETE      CAPRIGHT(1, 0x0000000000001000ULL)
/* Allows for extattr_get_fd(2). */
#define CAP_EXTATTR_GET         CAPRIGHT(1, 0x0000000000002000ULL)
/* Allows for extattr_list_fd(2). */
#define CAP_EXTATTR_LIST        CAPRIGHT(1, 0x0000000000004000ULL)
/* Allows for extattr_set_fd(2). */
#define CAP_EXTATTR_SET         CAPRIGHT(1, 0x0000000000008000ULL)

/* Access Control Lists. */
/* Allows for acl_valid_fd_np(3). */
#define CAP_ACL_CHECK           CAPRIGHT(1, 0x0000000000010000ULL)
/* Allows for acl_delete_fd_np(3). */
#define CAP_ACL_DELETE          CAPRIGHT(1, 0x0000000000020000ULL)
/* Allows for acl_get_fd(3) and acl_get_fd_np(3). */
#define CAP_ACL_GET             CAPRIGHT(1, 0x0000000000040000ULL)
/* Allows for acl_set_fd(3) and acl_set_fd_np(3). */
#define CAP_ACL_SET             CAPRIGHT(1, 0x0000000000080000ULL)

/* Allows for kevent(2) on kqueue descriptor with changelist != NULL. */
#define CAP_KQUEUE_CHANGE       CAPRIGHT(1, 0x0000000000100000ULL)

#define CAP_KQUEUE              (CAP_KQUEUE_EVENT | CAP_KQUEUE_CHANGE)

/* Allows operations on inotify descriptors. */
#define CAP_INOTIFY_ADD         CAPRIGHT(1, 0x0000000000200000ULL)
#define CAP_INOTIFY_RM          CAPRIGHT(1, 0x0000000000400000ULL)

/* All used bits for index 1. */
#define CAP_ALL1                CAPRIGHT(1, 0x00000000007FFFFFULL)

/* Available bits for index 1. */
#define CAP_UNUSED1_22          CAPRIGHT(1, 0x0000000000800000ULL)
/* ... */
#define CAP_UNUSED1_57          CAPRIGHT(1, 0x0100000000000000ULL)

/* Backward compatibility. */
#define CAP_POLL_EVENT          CAP_EVENT

#define CAP_ALL(rights)         do {                                    \
        (rights)->cr_rights[0] =                                        \
            ((uint64_t)CAP_RIGHTS_VERSION << 62) | CAP_ALL0;            \
        (rights)->cr_rights[1] = CAP_ALL1;                              \
} while (0)

#define CAP_NONE(rights)        do {                                    \
        (rights)->cr_rights[0] =                                        \
            ((uint64_t)CAP_RIGHTS_VERSION << 62) | CAPRIGHT(0, 0ULL);   \
        (rights)->cr_rights[1] = CAPRIGHT(1, 0ULL);                     \
} while (0)

#define CAPRVER(right)          ((int)((right) >> 62))
#define CAPVER(rights)          CAPRVER((rights)->cr_rights[0])
#define CAPARSIZE(rights)       (CAPVER(rights) + 2)
#define CAPIDXBIT(right)        ((int)(((right) >> 57) & 0x1F))

/*
 * Allowed fcntl(2) commands.
 */
#define CAP_FCNTL_GETFL         (1 << F_GETFL)
#define CAP_FCNTL_SETFL         (1 << F_SETFL)
#define CAP_FCNTL_GETOWN        (1 << F_GETOWN)
#define CAP_FCNTL_SETOWN        (1 << F_SETOWN)
#define CAP_FCNTL_ALL           (CAP_FCNTL_GETFL | CAP_FCNTL_SETFL | \
                                 CAP_FCNTL_GETOWN | CAP_FCNTL_SETOWN)

#define CAP_IOCTLS_ALL  SSIZE_MAX

__BEGIN_DECLS

#define cap_rights_init(...)                                            \
        __cap_rights_init(CAP_RIGHTS_VERSION, __VA_ARGS__, 0ULL)
cap_rights_t *__cap_rights_init(int version, cap_rights_t *rights, ...);

#define cap_rights_set(...)                                             \
        __cap_rights_set(__VA_ARGS__, 0ULL)
cap_rights_t *__cap_rights_set(cap_rights_t *rights, ...);

#define cap_rights_clear(...)                                           \
        __cap_rights_clear(__VA_ARGS__, 0ULL)
cap_rights_t *__cap_rights_clear(cap_rights_t *rights, ...);

#define cap_rights_is_set(...)                                          \
        __cap_rights_is_set(__VA_ARGS__, 0ULL)
bool __cap_rights_is_set(const cap_rights_t *rights, ...);

bool cap_rights_is_empty(const cap_rights_t *rights);

bool cap_rights_is_valid(const cap_rights_t *rights);
cap_rights_t *cap_rights_merge(cap_rights_t *dst, const cap_rights_t *src);
cap_rights_t *cap_rights_remove(cap_rights_t *dst, const cap_rights_t *src);

#ifdef _KERNEL
/*
 * We only support one size to reduce branching.
 */
_Static_assert(CAP_RIGHTS_VERSION == CAP_RIGHTS_VERSION_00,
    "unsupported version of capsicum rights");

#define cap_rights_init_zero(r) ({                                      \
        cap_rights_t *_r = (r);                                         \
        CAP_NONE(_r);                                                   \
        _r;                                                             \
})

#define cap_rights_init_one(r, right) ({                                \
        CTASSERT(CAPRVER(right) == CAP_RIGHTS_VERSION);                 \
        cap_rights_t *_r = (r);                                         \
        CAP_NONE(_r);                                                   \
        _r->cr_rights[CAPIDXBIT(right) - 1] |= right;                   \
        _r;                                                             \
})

#define cap_rights_set_one(r, right) ({                                 \
        CTASSERT(CAPRVER(right) == CAP_RIGHTS_VERSION);                 \
        cap_rights_t *_r = (r);                                         \
        _r->cr_rights[CAPIDXBIT(right) - 1] |= right;                   \
        _r;                                                             \
})

#define _CAP_RIGHTS_WORD_INITIALIZER(i, r)                              \
        (CAPIDXBIT(r) == (i) + 1 ? (r) : 0ULL)

/*
 * Define a set of up to two rights at compile time.
 */
#define CAP_RIGHTS_INITIALIZER2(r1, r2) ((struct cap_rights){           \
        .cr_rights = {                                                  \
                [0] = ((uint64_t)CAP_RIGHTS_VERSION << 62) |            \
                    _CAP_RIGHTS_WORD_INITIALIZER(0, r1) |               \
                    _CAP_RIGHTS_WORD_INITIALIZER(0, r2),                \
                [1] = _CAP_RIGHTS_WORD_INITIALIZER(1, r1) |             \
                    _CAP_RIGHTS_WORD_INITIALIZER(1, r2),                \
        },                                                              \
})
#define CAP_RIGHTS_INITIALIZER(r)                                       \
        CAP_RIGHTS_INITIALIZER2(r, 0ULL)

/*
 * Allow checking caps which are possibly getting modified at the same time.
 * The caller is expected to determine whether the result is legitimate via
 * other means, see fget_unlocked for an example.
 */

static inline bool
cap_rights_contains_transient(const cap_rights_t *big, const cap_rights_t *little)
{

        if (__predict_true(
            (big->cr_rights[0] & little->cr_rights[0]) == little->cr_rights[0] &&
            (big->cr_rights[1] & little->cr_rights[1]) == little->cr_rights[1]))
                return (true);
        return (false);
}

#define cap_rights_contains cap_rights_contains_transient

int cap_check_failed_notcapable(const cap_rights_t *havep,
    const cap_rights_t *needp);

static inline int
cap_check_inline(const cap_rights_t *havep, const cap_rights_t *needp)
{

        if (__predict_false(!cap_rights_contains(havep, needp)))
                return (cap_check_failed_notcapable(havep, needp));
        return (0);
}

static inline int
cap_check_inline_transient(const cap_rights_t *havep, const cap_rights_t *needp)
{

        if (__predict_false(!cap_rights_contains(havep, needp)))
                return (1);
        return (0);
}
#else
bool cap_rights_contains(const cap_rights_t *big, const cap_rights_t *little);
#endif

__END_DECLS

#ifdef _KERNEL

#include <sys/systm.h>
#include <sys/ktrace.h>

#ifdef KTRACE
#define CAP_TRACING(td) KTRPOINT((td), KTR_CAPFAIL)
#else
#define CAP_TRACING(td) 0
#endif

#define IN_CAPABILITY_MODE(td) (((td)->td_ucred->cr_flags & CRED_FLAG_CAPMODE) != 0)

struct filedesc;
struct filedescent;

/*
 * Test whether a capability grants the requested rights.
 */
int     cap_check(const cap_rights_t *havep, const cap_rights_t *needp);
/*
 * Convert capability rights into VM access flags.
 */
vm_prot_t       cap_rights_to_vmprot(const cap_rights_t *havep);

/*
 * For the purposes of procstat(1) and similar tools, allow kern_descrip.c to
 * extract the rights from a capability.
 *
 * Dereferencing fdep requires filedesc.h, but including it would cause
 * significant pollution. Instead add a macro for consumers which want it,
 * most notably kern_descrip.c.
 */
#define cap_rights_fde_inline(fdep)     (&(fdep)->fde_rights)

const cap_rights_t      *cap_rights_fde(const struct filedescent *fde);
const cap_rights_t      *cap_rights(struct filedesc *fdp, int fd);

int     cap_ioctl_check(struct filedesc *fdp, int fd, u_long cmd);
int     cap_fcntl_check_fde(struct filedescent *fde, int cmd);
int     cap_fcntl_check(struct filedesc *fdp, int fd, int cmd);

extern bool trap_enotcap;

#else /* !_KERNEL */

__BEGIN_DECLS
/*
 * cap_enter(): Cause the process to enter capability mode, which will
 * prevent it from directly accessing global namespaces.  System calls will
 * be limited to process-local, process-inherited, or file descriptor
 * operations.  If already in capability mode, a no-op.
 */
int     cap_enter(void);

/*
 * Are we sandboxed (in capability mode)?
 * This is a libc wrapper around the cap_getmode(2) system call.
 */
bool    cap_sandboxed(void);

/*
 * cap_getmode(): Are we in capability mode?
 */
int     cap_getmode(u_int *modep);

/*
 * Limits capability rights for the given descriptor (CAP_*).
 */
int cap_rights_limit(int fd, const cap_rights_t *rights);
/*
 * Returns capability rights for the given descriptor.
 */
#define cap_rights_get(fd, rights)                                      \
        __cap_rights_get(CAP_RIGHTS_VERSION, (fd), (rights))
int __cap_rights_get(int version, int fd, cap_rights_t *rights);
/*
 * Limits allowed ioctls for the given descriptor.
 */
int cap_ioctls_limit(int fd, const cap_ioctl_t *cmds, size_t ncmds);
/*
 * Returns array of allowed ioctls for the given descriptor.
 * If all ioctls are allowed, the cmds array is not populated and
 * the function returns CAP_IOCTLS_ALL.
 */
ssize_t cap_ioctls_get(int fd, cap_ioctl_t *cmds, size_t maxcmds);
/*
 * Limits allowed fcntls for the given descriptor (CAP_FCNTL_*).
 */
int cap_fcntls_limit(int fd, uint32_t fcntlrights);
/*
 * Returns bitmask of allowed fcntls for the given descriptor.
 */
int cap_fcntls_get(int fd, uint32_t *fcntlrightsp);

__END_DECLS

#endif /* !_KERNEL */

#endif /* !_SYS_CAPSICUM_H_ */