[deliverable/linux.git] / include / linux / capability.h

/*
 * This is <linux/capability.h>
 *
 * Andrew G. Morgan <morgan@kernel.org>
 * Alexander Kjeldaas <astor@guardian.no>
 * with help from Aleph1, Roland Buresund and Andrew Main.
 *
 * See here for the libcap library ("POSIX draft" compliance):
 *
 * ftp://linux.kernel.org/pub/linux/libs/security/linux-privs/kernel-2.6/
 */

#ifndef _LINUX_CAPABILITY_H
#define _LINUX_CAPABILITY_H

#include <linux/types.h>

struct task_struct;

/* User-level do most of the mapping between kernel and user
   capabilities based on the version tag given by the kernel. The
   kernel might be somewhat backwards compatible, but don't bet on
   it. */

/* Note, cap_t, is defined by POSIX (draft) to be an "opaque" pointer to
   a set of three capability sets.  The transposition of 3*the
   following structure to such a composite is better handled in a user
   library since the draft standard requires the use of malloc/free
   etc.. */

#define _LINUX_CAPABILITY_VERSION_1  0x19980330
#define _LINUX_CAPABILITY_U32S_1     1

#define _LINUX_CAPABILITY_VERSION_2  0x20071026  /* deprecated - use v3 */
#define _LINUX_CAPABILITY_U32S_2     2

#define _LINUX_CAPABILITY_VERSION_3  0x20080522
#define _LINUX_CAPABILITY_U32S_3     2

typedef struct __user_cap_header_struct {
	__u32 version;
	int pid;
} __user *cap_user_header_t;

typedef struct __user_cap_data_struct {
        __u32 effective;
        __u32 permitted;
        __u32 inheritable;
} __user *cap_user_data_t;


#define XATTR_CAPS_SUFFIX "capability"
#define XATTR_NAME_CAPS XATTR_SECURITY_PREFIX XATTR_CAPS_SUFFIX

#define VFS_CAP_REVISION_MASK	0xFF000000
#define VFS_CAP_FLAGS_MASK	~VFS_CAP_REVISION_MASK
#define VFS_CAP_FLAGS_EFFECTIVE	0x000001

#define VFS_CAP_REVISION_1	0x01000000
#define VFS_CAP_U32_1           1
#define XATTR_CAPS_SZ_1         (sizeof(__le32)*(1 + 2*VFS_CAP_U32_1))

#define VFS_CAP_REVISION_2	0x02000000
#define VFS_CAP_U32_2           2
#define XATTR_CAPS_SZ_2         (sizeof(__le32)*(1 + 2*VFS_CAP_U32_2))

#define XATTR_CAPS_SZ           XATTR_CAPS_SZ_2
#define VFS_CAP_U32             VFS_CAP_U32_2
#define VFS_CAP_REVISION	VFS_CAP_REVISION_2


struct vfs_cap_data {
	__le32 magic_etc;            /* Little endian */
	struct {
		__le32 permitted;    /* Little endian */
		__le32 inheritable;  /* Little endian */
	} data[VFS_CAP_U32];
};

#ifndef __KERNEL__

/*
 * Backwardly compatible definition for source code - trapped in a
 * 32-bit world. If you find you need this, please consider using
 * libcap to untrap yourself...
 */
#define _LINUX_CAPABILITY_VERSION  _LINUX_CAPABILITY_VERSION_1
#define _LINUX_CAPABILITY_U32S     _LINUX_CAPABILITY_U32S_1

#else

#define _KERNEL_CAPABILITY_VERSION _LINUX_CAPABILITY_VERSION_3
#define _KERNEL_CAPABILITY_U32S    _LINUX_CAPABILITY_U32S_3

typedef struct kernel_cap_struct {
	__u32 cap[_KERNEL_CAPABILITY_U32S];
} kernel_cap_t;

#define _USER_CAP_HEADER_SIZE  (sizeof(struct __user_cap_header_struct))
#define _KERNEL_CAP_T_SIZE     (sizeof(kernel_cap_t))

#endif


/**
 ** POSIX-draft defined capabilities.
 **/

/* In a system with the [_POSIX_CHOWN_RESTRICTED] option defined, this
   overrides the restriction of changing file ownership and group
   ownership. */

#define CAP_CHOWN            0

/* Override all DAC access, including ACL execute access if
   [_POSIX_ACL] is defined. Excluding DAC access covered by
   CAP_LINUX_IMMUTABLE. */

#define CAP_DAC_OVERRIDE     1

/* Overrides all DAC restrictions regarding read and search on files
   and directories, including ACL restrictions if [_POSIX_ACL] is
   defined. Excluding DAC access covered by CAP_LINUX_IMMUTABLE. */

#define CAP_DAC_READ_SEARCH  2

/* Overrides all restrictions about allowed operations on files, where
   file owner ID must be equal to the user ID, except where CAP_FSETID
   is applicable. It doesn't override MAC and DAC restrictions. */

#define CAP_FOWNER           3

/* Overrides the following restrictions that the effective user ID
   shall match the file owner ID when setting the S_ISUID and S_ISGID
   bits on that file; that the effective group ID (or one of the
   supplementary group IDs) shall match the file owner ID when setting
   the S_ISGID bit on that file; that the S_ISUID and S_ISGID bits are
   cleared on successful return from chown(2) (not implemented). */

#define CAP_FSETID           4

/* Overrides the restriction that the real or effective user ID of a
   process sending a signal must match the real or effective user ID
   of the process receiving the signal. */

#define CAP_KILL             5

/* Allows setgid(2) manipulation */
/* Allows setgroups(2) */
/* Allows forged gids on socket credentials passing. */

#define CAP_SETGID           6

/* Allows set*uid(2) manipulation (including fsuid). */
/* Allows forged pids on socket credentials passing. */

#define CAP_SETUID           7


/**
 ** Linux-specific capabilities
 **/

/* Without VFS support for capabilities:
 *   Transfer any capability in your permitted set to any pid,
 *   remove any capability in your permitted set from any pid
 * With VFS support for capabilities (neither of above, but)
 *   Add any capability from current's capability bounding set
 *       to the current process' inheritable set
 *   Allow taking bits out of capability bounding set
 *   Allow modification of the securebits for a process
 */

#define CAP_SETPCAP          8

/* Allow modification of S_IMMUTABLE and S_APPEND file attributes */

#define CAP_LINUX_IMMUTABLE  9

/* Allows binding to TCP/UDP sockets below 1024 */
/* Allows binding to ATM VCIs below 32 */

#define CAP_NET_BIND_SERVICE 10

/* Allow broadcasting, listen to multicast */

#define CAP_NET_BROADCAST    11

/* Allow interface configuration */
/* Allow administration of IP firewall, masquerading and accounting */
/* Allow setting debug option on sockets */
/* Allow modification of routing tables */
/* Allow setting arbitrary process / process group ownership on
   sockets */
/* Allow binding to any address for transparent proxying */
/* Allow setting TOS (type of service) */
/* Allow setting promiscuous mode */
/* Allow clearing driver statistics */
/* Allow multicasting */
/* Allow read/write of device-specific registers */
/* Allow activation of ATM control sockets */

#define CAP_NET_ADMIN        12

/* Allow use of RAW sockets */
/* Allow use of PACKET sockets */

#define CAP_NET_RAW          13

/* Allow locking of shared memory segments */
/* Allow mlock and mlockall (which doesn't really have anything to do
   with IPC) */

#define CAP_IPC_LOCK         14

/* Override IPC ownership checks */

#define CAP_IPC_OWNER        15

/* Insert and remove kernel modules - modify kernel without limit */
#define CAP_SYS_MODULE       16

/* Allow ioperm/iopl access */
/* Allow sending USB messages to any device via /proc/bus/usb */

#define CAP_SYS_RAWIO        17

/* Allow use of chroot() */

#define CAP_SYS_CHROOT       18

/* Allow ptrace() of any process */

#define CAP_SYS_PTRACE       19

/* Allow configuration of process accounting */

#define CAP_SYS_PACCT        20

/* Allow configuration of the secure attention key */
/* Allow administration of the random device */
/* Allow examination and configuration of disk quotas */
/* Allow configuring the kernel's syslog (printk behaviour) */
/* Allow setting the domainname */
/* Allow setting the hostname */
/* Allow calling bdflush() */
/* Allow mount() and umount(), setting up new smb connection */
/* Allow some autofs root ioctls */
/* Allow nfsservctl */
/* Allow VM86_REQUEST_IRQ */
/* Allow to read/write pci config on alpha */
/* Allow irix_prctl on mips (setstacksize) */
/* Allow flushing all cache on m68k (sys_cacheflush) */
/* Allow removing semaphores */
/* Used instead of CAP_CHOWN to "chown" IPC message queues, semaphores
   and shared memory */
/* Allow locking/unlocking of shared memory segment */
/* Allow turning swap on/off */
/* Allow forged pids on socket credentials passing */
/* Allow setting readahead and flushing buffers on block devices */
/* Allow setting geometry in floppy driver */
/* Allow turning DMA on/off in xd driver */
/* Allow administration of md devices (mostly the above, but some
   extra ioctls) */
/* Allow tuning the ide driver */
/* Allow access to the nvram device */
/* Allow administration of apm_bios, serial and bttv (TV) device */
/* Allow manufacturer commands in isdn CAPI support driver */
/* Allow reading non-standardized portions of pci configuration space */
/* Allow DDI debug ioctl on sbpcd driver */
/* Allow setting up serial ports */
/* Allow sending raw qic-117 commands */
/* Allow enabling/disabling tagged queuing on SCSI controllers and sending
   arbitrary SCSI commands */
/* Allow setting encryption key on loopback filesystem */
/* Allow setting zone reclaim policy */

#define CAP_SYS_ADMIN        21

/* Allow use of reboot() */

#define CAP_SYS_BOOT         22

/* Allow raising priority and setting priority on other (different
   UID) processes */
/* Allow use of FIFO and round-robin (realtime) scheduling on own
   processes and setting the scheduling algorithm used by another
   process. */
/* Allow setting cpu affinity on other processes */

#define CAP_SYS_NICE         23

/* Override resource limits. Set resource limits. */
/* Override quota limits. */
/* Override reserved space on ext2 filesystem */
/* Modify data journaling mode on ext3 filesystem (uses journaling
   resources) */
/* NOTE: ext2 honors fsuid when checking for resource overrides, so
   you can override using fsuid too */
/* Override size restrictions on IPC message queues */
/* Allow more than 64hz interrupts from the real-time clock */
/* Override max number of consoles on console allocation */
/* Override max number of keymaps */

#define CAP_SYS_RESOURCE     24

/* Allow manipulation of system clock */
/* Allow irix_stime on mips */
/* Allow setting the real-time clock */

#define CAP_SYS_TIME         25

/* Allow configuration of tty devices */
/* Allow vhangup() of tty */

#define CAP_SYS_TTY_CONFIG   26

/* Allow the privileged aspects of mknod() */

#define CAP_MKNOD            27

/* Allow taking of leases on files */

#define CAP_LEASE            28

#define CAP_AUDIT_WRITE      29

#define CAP_AUDIT_CONTROL    30

#define CAP_SETFCAP	     31

/* Override MAC access.
   The base kernel enforces no MAC policy.
   An LSM may enforce a MAC policy, and if it does and it chooses
   to implement capability based overrides of that policy, this is
   the capability it should use to do so. */

#define CAP_MAC_OVERRIDE     32

/* Allow MAC configuration or state changes.
   The base kernel requires no MAC configuration.
   An LSM may enforce a MAC policy, and if it does and it chooses
   to implement capability based checks on modifications to that
   policy or the data required to maintain it, this is the
   capability it should use to do so. */

#define CAP_MAC_ADMIN        33

#define CAP_LAST_CAP         CAP_MAC_ADMIN

#define cap_valid(x) ((x) >= 0 && (x) <= CAP_LAST_CAP)

/*
 * Bit location of each capability (used by user-space library and kernel)
 */

#define CAP_TO_INDEX(x)     ((x) >> 5)        /* 1 << 5 == bits in __u32 */
#define CAP_TO_MASK(x)      (1 << ((x) & 31)) /* mask for indexed __u32 */

#ifdef __KERNEL__

/*
 * Internal kernel functions only
 */

#define CAP_FOR_EACH_U32(__capi)  \
	for (__capi = 0; __capi < _KERNEL_CAPABILITY_U32S; ++__capi)

# define CAP_FS_MASK_B0     (CAP_TO_MASK(CAP_CHOWN)		\
			    | CAP_TO_MASK(CAP_DAC_OVERRIDE)	\
			    | CAP_TO_MASK(CAP_DAC_READ_SEARCH)	\
			    | CAP_TO_MASK(CAP_FOWNER)		\
			    | CAP_TO_MASK(CAP_FSETID))

# define CAP_FS_MASK_B1     (CAP_TO_MASK(CAP_MAC_OVERRIDE))

#if _KERNEL_CAPABILITY_U32S != 2
# error Fix up hand-coded capability macro initializers
#else /* HAND-CODED capability initializers */

# define CAP_EMPTY_SET    ((kernel_cap_t){{ 0, 0 }})
# define CAP_FULL_SET     ((kernel_cap_t){{ ~0, ~0 }})
# define CAP_INIT_EFF_SET ((kernel_cap_t){{ ~CAP_TO_MASK(CAP_SETPCAP), ~0 }})
# define CAP_FS_SET       ((kernel_cap_t){{ CAP_FS_MASK_B0, CAP_FS_MASK_B1 } })
# define CAP_NFSD_SET     ((kernel_cap_t){{ CAP_FS_MASK_B0|CAP_TO_MASK(CAP_SYS_RESOURCE), \
					CAP_FS_MASK_B1 } })

#endif /* _KERNEL_CAPABILITY_U32S != 2 */

#define CAP_INIT_INH_SET    CAP_EMPTY_SET

# define cap_clear(c)         do { (c) = __cap_empty_set; } while (0)
# define cap_set_full(c)      do { (c) = __cap_full_set; } while (0)
# define cap_set_init_eff(c)  do { (c) = __cap_init_eff_set; } while (0)

#define cap_raise(c, flag)  ((c).cap[CAP_TO_INDEX(flag)] |= CAP_TO_MASK(flag))
#define cap_lower(c, flag)  ((c).cap[CAP_TO_INDEX(flag)] &= ~CAP_TO_MASK(flag))
#define cap_raised(c, flag) ((c).cap[CAP_TO_INDEX(flag)] & CAP_TO_MASK(flag))

#define CAP_BOP_ALL(c, a, b, OP)                                    \
do {                                                                \
	unsigned __capi;                                            \
	CAP_FOR_EACH_U32(__capi) {                                  \
		c.cap[__capi] = a.cap[__capi] OP b.cap[__capi];     \
	}                                                           \
} while (0)

#define CAP_UOP_ALL(c, a, OP)                                       \
do {                                                                \
	unsigned __capi;                                            \
	CAP_FOR_EACH_U32(__capi) {                                  \
		c.cap[__capi] = OP a.cap[__capi];                   \
	}                                                           \
} while (0)

static inline kernel_cap_t cap_combine(const kernel_cap_t a,
				       const kernel_cap_t b)
{
	kernel_cap_t dest;
	CAP_BOP_ALL(dest, a, b, |);
	return dest;
}

static inline kernel_cap_t cap_intersect(const kernel_cap_t a,
					 const kernel_cap_t b)
{
	kernel_cap_t dest;
	CAP_BOP_ALL(dest, a, b, &);
	return dest;
}

static inline kernel_cap_t cap_drop(const kernel_cap_t a,
				    const kernel_cap_t drop)
{
	kernel_cap_t dest;
	CAP_BOP_ALL(dest, a, drop, &~);
	return dest;
}

static inline kernel_cap_t cap_invert(const kernel_cap_t c)
{
	kernel_cap_t dest;
	CAP_UOP_ALL(dest, c, ~);
	return dest;
}

static inline int cap_isclear(const kernel_cap_t a)
{
	unsigned __capi;
	CAP_FOR_EACH_U32(__capi) {
		if (a.cap[__capi] != 0)
			return 0;
	}
	return 1;
}

static inline int cap_issubset(const kernel_cap_t a, const kernel_cap_t set)
{
	kernel_cap_t dest;
	dest = cap_drop(a, set);
	return cap_isclear(dest);
}

/* Used to decide between falling back on the old suser() or fsuser(). */

static inline int cap_is_fs_cap(int cap)
{
	const kernel_cap_t __cap_fs_set = CAP_FS_SET;
	return !!(CAP_TO_MASK(cap) & __cap_fs_set.cap[CAP_TO_INDEX(cap)]);
}

static inline kernel_cap_t cap_drop_fs_set(const kernel_cap_t a)
{
	const kernel_cap_t __cap_fs_set = CAP_FS_SET;
	return cap_drop(a, __cap_fs_set);
}

static inline kernel_cap_t cap_raise_fs_set(const kernel_cap_t a,
					    const kernel_cap_t permitted)
{
	const kernel_cap_t __cap_fs_set = CAP_FS_SET;
	return cap_combine(a,
			   cap_intersect(permitted, __cap_fs_set));
}

static inline kernel_cap_t cap_drop_nfsd_set(const kernel_cap_t a)
{
	const kernel_cap_t __cap_fs_set = CAP_NFSD_SET;
	return cap_drop(a, __cap_fs_set);
}

static inline kernel_cap_t cap_raise_nfsd_set(const kernel_cap_t a,
					      const kernel_cap_t permitted)
{
	const kernel_cap_t __cap_nfsd_set = CAP_NFSD_SET;
	return cap_combine(a,
			   cap_intersect(permitted, __cap_nfsd_set));
}

extern const kernel_cap_t __cap_empty_set;
extern const kernel_cap_t __cap_full_set;
extern const kernel_cap_t __cap_init_eff_set;

kernel_cap_t cap_set_effective(const kernel_cap_t pE_new);

int capable(int cap);
int __capable(struct task_struct *t, int cap);

#endif /* __KERNEL__ */

#endif /* !_LINUX_CAPABILITY_H */
Commit	Line	Data
1da177e4 LT	1	/*
	2	* This is <linux/capability.h>
	3	*
b5376771	4	* Andrew G. Morgan <morgan@kernel.org>
1da177e4 LT	5	* Alexander Kjeldaas <astor@guardian.no>
	6	* with help from Aleph1, Roland Buresund and Andrew Main.
	7	*
	8	* See here for the libcap library ("POSIX draft" compliance):
	9	*
b5376771 SH	10	* ftp://linux.kernel.org/pub/linux/libs/security/linux-privs/kernel-2.6/
b5376771 SH	11	*/
1da177e4 LT	12
	13	#ifndef _LINUX_CAPABILITY_H
	14	#define _LINUX_CAPABILITY_H
	15
	16	#include <linux/types.h>
1da177e4	17
b7add02d AM	18	struct task_struct;
b7add02d AM	19
1da177e4 LT	20	/* User-level do most of the mapping between kernel and user
	21	capabilities based on the version tag given by the kernel. The
	22	kernel might be somewhat backwards compatible, but don't bet on
	23	it. */
	24
e338d263	25	/* Note, cap_t, is defined by POSIX (draft) to be an "opaque" pointer to
1da177e4 LT	26	a set of three capability sets. The transposition of 3*the
	27	following structure to such a composite is better handled in a user
	28	library since the draft standard requires the use of malloc/free
	29	etc.. */
b5376771	30
e338d263 AM	31	#define _LINUX_CAPABILITY_VERSION_1 0x19980330
	32	#define _LINUX_CAPABILITY_U32S_1 1
	33
ca05a99a	34	#define _LINUX_CAPABILITY_VERSION_2 0x20071026 /* deprecated - use v3 */
e338d263 AM	35	#define _LINUX_CAPABILITY_U32S_2 2
e338d263 AM	36
ca05a99a AM	37	#define _LINUX_CAPABILITY_VERSION_3 0x20080522
ca05a99a AM	38	#define _LINUX_CAPABILITY_U32S_3 2
1da177e4 LT	39
	40	typedef struct __user_cap_header_struct {
	41	__u32 version;
	42	int pid;
	43	} __user *cap_user_header_t;
b5376771	44
1da177e4 LT	45	typedef struct __user_cap_data_struct {
	46	__u32 effective;
	47	__u32 permitted;
	48	__u32 inheritable;
	49	} __user *cap_user_data_t;
1da177e4	50
e338d263	51
b5376771 SH	52	#define XATTR_CAPS_SUFFIX "capability"
	53	#define XATTR_NAME_CAPS XATTR_SECURITY_PREFIX XATTR_CAPS_SUFFIX
	54
b5376771	55	#define VFS_CAP_REVISION_MASK 0xFF000000
e338d263 AM	56	#define VFS_CAP_FLAGS_MASK ~VFS_CAP_REVISION_MASK
	57	#define VFS_CAP_FLAGS_EFFECTIVE 0x000001
	58
b5376771	59	#define VFS_CAP_REVISION_1 0x01000000
e338d263 AM	60	#define VFS_CAP_U32_1 1
e338d263 AM	61	#define XATTR_CAPS_SZ_1 (sizeof(__le32)(1 + 2VFS_CAP_U32_1))
b5376771	62
e338d263 AM	63	#define VFS_CAP_REVISION_2 0x02000000
	64	#define VFS_CAP_U32_2 2
	65	#define XATTR_CAPS_SZ_2 (sizeof(__le32)(1 + 2VFS_CAP_U32_2))
	66
	67	#define XATTR_CAPS_SZ XATTR_CAPS_SZ_2
	68	#define VFS_CAP_U32 VFS_CAP_U32_2
	69	#define VFS_CAP_REVISION VFS_CAP_REVISION_2
b5376771	70
b5376771 SH	71
b5376771 SH	72	struct vfs_cap_data {
e338d263	73	__le32 magic_etc; /* Little endian */
8f6936f4	74	struct {
e338d263 AM	75	__le32 permitted; /* Little endian */
	76	__le32 inheritable; /* Little endian */
	77	} data[VFS_CAP_U32];
b5376771 SH	78	};
b5376771 SH	79
ca05a99a AM	80	#ifndef __KERNEL__
	81
	82	/*
	83	* Backwardly compatible definition for source code - trapped in a
	84	* 32-bit world. If you find you need this, please consider using
	85	* libcap to untrap yourself...
	86	*/
	87	#define _LINUX_CAPABILITY_VERSION _LINUX_CAPABILITY_VERSION_1
	88	#define _LINUX_CAPABILITY_U32S _LINUX_CAPABILITY_U32S_1
	89
	90	#else
	91
	92	#define _KERNEL_CAPABILITY_VERSION _LINUX_CAPABILITY_VERSION_3
	93	#define _KERNEL_CAPABILITY_U32S _LINUX_CAPABILITY_U32S_3
1da177e4	94
1da177e4	95	typedef struct kernel_cap_struct {
ca05a99a	96	__u32 cap[_KERNEL_CAPABILITY_U32S];
1da177e4 LT	97	} kernel_cap_t;
1da177e4 LT	98
e338d263	99	#define _USER_CAP_HEADER_SIZE (sizeof(struct __user_cap_header_struct))
1da177e4 LT	100	#define _KERNEL_CAP_T_SIZE (sizeof(kernel_cap_t))
	101
	102	#endif
	103
	104
	105	/**
b5376771	106	** POSIX-draft defined capabilities.
1da177e4 LT	107	**/
	108
	109	/* In a system with the [_POSIX_CHOWN_RESTRICTED] option defined, this
	110	overrides the restriction of changing file ownership and group
	111	ownership. */
	112
	113	#define CAP_CHOWN 0
	114
	115	/* Override all DAC access, including ACL execute access if
	116	[_POSIX_ACL] is defined. Excluding DAC access covered by
	117	CAP_LINUX_IMMUTABLE. */
	118
	119	#define CAP_DAC_OVERRIDE 1
	120
	121	/* Overrides all DAC restrictions regarding read and search on files
	122	and directories, including ACL restrictions if [_POSIX_ACL] is
	123	defined. Excluding DAC access covered by CAP_LINUX_IMMUTABLE. */
	124
	125	#define CAP_DAC_READ_SEARCH 2
b5376771	126
1da177e4 LT	127	/* Overrides all restrictions about allowed operations on files, where
	128	file owner ID must be equal to the user ID, except where CAP_FSETID
	129	is applicable. It doesn't override MAC and DAC restrictions. */
	130
	131	#define CAP_FOWNER 3
	132
	133	/* Overrides the following restrictions that the effective user ID
	134	shall match the file owner ID when setting the S_ISUID and S_ISGID
	135	bits on that file; that the effective group ID (or one of the
	136	supplementary group IDs) shall match the file owner ID when setting
	137	the S_ISGID bit on that file; that the S_ISUID and S_ISGID bits are
	138	cleared on successful return from chown(2) (not implemented). */
	139
	140	#define CAP_FSETID 4
	141
1da177e4 LT	142	/* Overrides the restriction that the real or effective user ID of a
	143	process sending a signal must match the real or effective user ID
	144	of the process receiving the signal. */
	145
	146	#define CAP_KILL 5
	147
	148	/* Allows setgid(2) manipulation */
	149	/* Allows setgroups(2) */
	150	/* Allows forged gids on socket credentials passing. */
	151
	152	#define CAP_SETGID 6
	153
	154	/* Allows setuid(2) manipulation (including fsuid). /
	155	/* Allows forged pids on socket credentials passing. */
	156
	157	#define CAP_SETUID 7
	158
	159
	160	/**
	161	** Linux-specific capabilities
	162	**/
	163
e338d263 AM	164	/* Without VFS support for capabilities:
	165	* Transfer any capability in your permitted set to any pid,
	166	* remove any capability in your permitted set from any pid
	167	* With VFS support for capabilities (neither of above, but)
3b7391de SH	168	* Add any capability from current's capability bounding set
	169	* to the current process' inheritable set
	170	* Allow taking bits out of capability bounding set
3898b1b4	171	* Allow modification of the securebits for a process
e338d263	172	*/
1da177e4 LT	173
	174	#define CAP_SETPCAP 8
	175
	176	/* Allow modification of S_IMMUTABLE and S_APPEND file attributes */
	177
	178	#define CAP_LINUX_IMMUTABLE 9
	179
	180	/* Allows binding to TCP/UDP sockets below 1024 */
	181	/* Allows binding to ATM VCIs below 32 */
	182
	183	#define CAP_NET_BIND_SERVICE 10
	184
	185	/* Allow broadcasting, listen to multicast */
	186
	187	#define CAP_NET_BROADCAST 11
	188
	189	/* Allow interface configuration */
	190	/* Allow administration of IP firewall, masquerading and accounting */
	191	/* Allow setting debug option on sockets */
	192	/* Allow modification of routing tables */
	193	/* Allow setting arbitrary process / process group ownership on
	194	sockets */
	195	/* Allow binding to any address for transparent proxying */
	196	/* Allow setting TOS (type of service) */
	197	/* Allow setting promiscuous mode */
	198	/* Allow clearing driver statistics */
	199	/* Allow multicasting */
	200	/* Allow read/write of device-specific registers */
	201	/* Allow activation of ATM control sockets */
	202
	203	#define CAP_NET_ADMIN 12
	204
	205	/* Allow use of RAW sockets */
	206	/* Allow use of PACKET sockets */
	207
	208	#define CAP_NET_RAW 13
	209
	210	/* Allow locking of shared memory segments */
	211	/* Allow mlock and mlockall (which doesn't really have anything to do
	212	with IPC) */
	213
	214	#define CAP_IPC_LOCK 14
	215
	216	/* Override IPC ownership checks */
	217
	218	#define CAP_IPC_OWNER 15
	219
	220	/* Insert and remove kernel modules - modify kernel without limit */
1da177e4 LT	221	#define CAP_SYS_MODULE 16
	222
	223	/* Allow ioperm/iopl access */
	224	/* Allow sending USB messages to any device via /proc/bus/usb */
	225
	226	#define CAP_SYS_RAWIO 17
	227
	228	/* Allow use of chroot() */
	229
	230	#define CAP_SYS_CHROOT 18
	231
	232	/* Allow ptrace() of any process */
	233
	234	#define CAP_SYS_PTRACE 19
	235
	236	/* Allow configuration of process accounting */
	237
	238	#define CAP_SYS_PACCT 20
	239
	240	/* Allow configuration of the secure attention key */
	241	/* Allow administration of the random device */
	242	/* Allow examination and configuration of disk quotas */
	243	/* Allow configuring the kernel's syslog (printk behaviour) */
	244	/* Allow setting the domainname */
	245	/* Allow setting the hostname */
	246	/* Allow calling bdflush() */
	247	/* Allow mount() and umount(), setting up new smb connection */
	248	/* Allow some autofs root ioctls */
	249	/* Allow nfsservctl */
	250	/* Allow VM86_REQUEST_IRQ */
	251	/* Allow to read/write pci config on alpha */
	252	/* Allow irix_prctl on mips (setstacksize) */
	253	/* Allow flushing all cache on m68k (sys_cacheflush) */
	254	/* Allow removing semaphores */
	255	/* Used instead of CAP_CHOWN to "chown" IPC message queues, semaphores
	256	and shared memory */
	257	/* Allow locking/unlocking of shared memory segment */
	258	/* Allow turning swap on/off */
	259	/* Allow forged pids on socket credentials passing */
	260	/* Allow setting readahead and flushing buffers on block devices */
	261	/* Allow setting geometry in floppy driver */
	262	/* Allow turning DMA on/off in xd driver */
	263	/* Allow administration of md devices (mostly the above, but some
	264	extra ioctls) */
	265	/* Allow tuning the ide driver */
	266	/* Allow access to the nvram device */
	267	/* Allow administration of apm_bios, serial and bttv (TV) device */
	268	/* Allow manufacturer commands in isdn CAPI support driver */
	269	/* Allow reading non-standardized portions of pci configuration space */
	270	/* Allow DDI debug ioctl on sbpcd driver */
	271	/* Allow setting up serial ports */
	272	/* Allow sending raw qic-117 commands */
	273	/* Allow enabling/disabling tagged queuing on SCSI controllers and sending
	274	arbitrary SCSI commands */
	275	/* Allow setting encryption key on loopback filesystem */
bce5f6ba	276	/* Allow setting zone reclaim policy */
1da177e4 LT	277
	278	#define CAP_SYS_ADMIN 21
	279
	280	/* Allow use of reboot() */
	281
	282	#define CAP_SYS_BOOT 22
	283
	284	/* Allow raising priority and setting priority on other (different
	285	UID) processes */
	286	/* Allow use of FIFO and round-robin (realtime) scheduling on own
	287	processes and setting the scheduling algorithm used by another
	288	process. */
	289	/* Allow setting cpu affinity on other processes */
	290
	291	#define CAP_SYS_NICE 23
	292
	293	/* Override resource limits. Set resource limits. */
	294	/* Override quota limits. */
	295	/* Override reserved space on ext2 filesystem */
	296	/* Modify data journaling mode on ext3 filesystem (uses journaling
	297	resources) */
b5376771	298	/* NOTE: ext2 honors fsuid when checking for resource overrides, so
1da177e4 LT	299	you can override using fsuid too */
	300	/* Override size restrictions on IPC message queues */
	301	/* Allow more than 64hz interrupts from the real-time clock */
	302	/* Override max number of consoles on console allocation */
	303	/* Override max number of keymaps */
	304
	305	#define CAP_SYS_RESOURCE 24
	306
	307	/* Allow manipulation of system clock */
	308	/* Allow irix_stime on mips */
	309	/* Allow setting the real-time clock */
	310
	311	#define CAP_SYS_TIME 25
	312
	313	/* Allow configuration of tty devices */
	314	/* Allow vhangup() of tty */
	315
	316	#define CAP_SYS_TTY_CONFIG 26
	317
	318	/* Allow the privileged aspects of mknod() */
	319
	320	#define CAP_MKNOD 27
	321
	322	/* Allow taking of leases on files */
	323
	324	#define CAP_LEASE 28
	325
	326	#define CAP_AUDIT_WRITE 29
	327
	328	#define CAP_AUDIT_CONTROL 30
	329
b5376771 SH	330	#define CAP_SETFCAP 31
b5376771 SH	331
e114e473 CS	332	/* Override MAC access.
	333	The base kernel enforces no MAC policy.
	334	An LSM may enforce a MAC policy, and if it does and it chooses
	335	to implement capability based overrides of that policy, this is
	336	the capability it should use to do so. */
	337
	338	#define CAP_MAC_OVERRIDE 32
	339
	340	/* Allow MAC configuration or state changes.
	341	The base kernel requires no MAC configuration.
	342	An LSM may enforce a MAC policy, and if it does and it chooses
	343	to implement capability based checks on modifications to that
	344	policy or the data required to maintain it, this is the
	345	capability it should use to do so. */
	346
	347	#define CAP_MAC_ADMIN 33
	348
	349	#define CAP_LAST_CAP CAP_MAC_ADMIN
3b7391de SH	350
	351	#define cap_valid(x) ((x) >= 0 && (x) <= CAP_LAST_CAP)
	352
e338d263 AM	353	/*
	354	* Bit location of each capability (used by user-space library and kernel)
	355	*/
	356
	357	#define CAP_TO_INDEX(x) ((x) >> 5) /* 1 << 5 == bits in __u32 */
	358	#define CAP_TO_MASK(x) (1 << ((x) & 31)) /* mask for indexed __u32 */
	359
1da177e4	360	#ifdef __KERNEL__
1da177e4 LT	361
	362	/*
	363	* Internal kernel functions only
	364	*/
b5376771	365
e338d263	366	#define CAP_FOR_EACH_U32(__capi) \
ca05a99a	367	for (__capi = 0; __capi < _KERNEL_CAPABILITY_U32S; ++__capi)
e338d263 AM	368
	369	# define CAP_FS_MASK_B0 (CAP_TO_MASK(CAP_CHOWN) \
	370	\| CAP_TO_MASK(CAP_DAC_OVERRIDE) \
	371	\| CAP_TO_MASK(CAP_DAC_READ_SEARCH) \
	372	\| CAP_TO_MASK(CAP_FOWNER) \
	373	\| CAP_TO_MASK(CAP_FSETID))
	374
e114e473 CS	375	# define CAP_FS_MASK_B1 (CAP_TO_MASK(CAP_MAC_OVERRIDE))
e114e473 CS	376
ca05a99a	377	#if _KERNEL_CAPABILITY_U32S != 2
e338d263 AM	378	# error Fix up hand-coded capability macro initializers
	379	#else /* HAND-CODED capability initializers */
	380
25f2ea9f DH	381	# define CAP_EMPTY_SET ((kernel_cap_t){{ 0, 0 }})
	382	# define CAP_FULL_SET ((kernel_cap_t){{ ~0, ~0 }})
	383	# define CAP_INIT_EFF_SET ((kernel_cap_t){{ ~CAP_TO_MASK(CAP_SETPCAP), ~0 }})
	384	# define CAP_FS_SET ((kernel_cap_t){{ CAP_FS_MASK_B0, CAP_FS_MASK_B1 } })
	385	# define CAP_NFSD_SET ((kernel_cap_t){{ CAP_FS_MASK_B0\|CAP_TO_MASK(CAP_SYS_RESOURCE), \
	386	CAP_FS_MASK_B1 } })
e338d263	387
ca05a99a	388	#endif /* _KERNEL_CAPABILITY_U32S != 2 */
e338d263 AM	389
	390	#define CAP_INIT_INH_SET CAP_EMPTY_SET
	391
	392	# define cap_clear(c) do { (c) = __cap_empty_set; } while (0)
	393	# define cap_set_full(c) do { (c) = __cap_full_set; } while (0)
	394	# define cap_set_init_eff(c) do { (c) = __cap_init_eff_set; } while (0)
	395
	396	#define cap_raise(c, flag) ((c).cap[CAP_TO_INDEX(flag)] \|= CAP_TO_MASK(flag))
	397	#define cap_lower(c, flag) ((c).cap[CAP_TO_INDEX(flag)] &= ~CAP_TO_MASK(flag))
	398	#define cap_raised(c, flag) ((c).cap[CAP_TO_INDEX(flag)] & CAP_TO_MASK(flag))
	399
	400	#define CAP_BOP_ALL(c, a, b, OP) \
	401	do { \
	402	unsigned __capi; \
	403	CAP_FOR_EACH_U32(__capi) { \
	404	c.cap[__capi] = a.cap[__capi] OP b.cap[__capi]; \
	405	} \
	406	} while (0)
	407
	408	#define CAP_UOP_ALL(c, a, OP) \
	409	do { \
	410	unsigned __capi; \
	411	CAP_FOR_EACH_U32(__capi) { \
	412	c.cap[__capi] = OP a.cap[__capi]; \
	413	} \
	414	} while (0)
	415
	416	static inline kernel_cap_t cap_combine(const kernel_cap_t a,
	417	const kernel_cap_t b)
	418	{
	419	kernel_cap_t dest;
	420	CAP_BOP_ALL(dest, a, b, \|);
	421	return dest;
	422	}
1da177e4	423
e338d263 AM	424	static inline kernel_cap_t cap_intersect(const kernel_cap_t a,
	425	const kernel_cap_t b)
	426	{
	427	kernel_cap_t dest;
	428	CAP_BOP_ALL(dest, a, b, &);
	429	return dest;
	430	}
1da177e4	431
e338d263 AM	432	static inline kernel_cap_t cap_drop(const kernel_cap_t a,
	433	const kernel_cap_t drop)
	434	{
	435	kernel_cap_t dest;
	436	CAP_BOP_ALL(dest, a, drop, &~);
	437	return dest;
	438	}
1da177e4	439
e338d263 AM	440	static inline kernel_cap_t cap_invert(const kernel_cap_t c)
	441	{
	442	kernel_cap_t dest;
	443	CAP_UOP_ALL(dest, c, ~);
	444	return dest;
	445	}
1da177e4	446
e338d263 AM	447	static inline int cap_isclear(const kernel_cap_t a)
	448	{
	449	unsigned __capi;
	450	CAP_FOR_EACH_U32(__capi) {
	451	if (a.cap[__capi] != 0)
	452	return 0;
	453	}
	454	return 1;
	455	}
1da177e4	456
e338d263 AM	457	static inline int cap_issubset(const kernel_cap_t a, const kernel_cap_t set)
	458	{
	459	kernel_cap_t dest;
	460	dest = cap_drop(a, set);
	461	return cap_isclear(dest);
	462	}
1da177e4	463
e338d263	464	/* Used to decide between falling back on the old suser() or fsuser(). */
1da177e4	465
e338d263	466	static inline int cap_is_fs_cap(int cap)
1da177e4	467	{
e338d263 AM	468	const kernel_cap_t __cap_fs_set = CAP_FS_SET;
e338d263 AM	469	return !!(CAP_TO_MASK(cap) & __cap_fs_set.cap[CAP_TO_INDEX(cap)]);
1da177e4 LT	470	}
1da177e4 LT	471
e338d263	472	static inline kernel_cap_t cap_drop_fs_set(const kernel_cap_t a)
1da177e4	473	{
e338d263 AM	474	const kernel_cap_t __cap_fs_set = CAP_FS_SET;
e338d263 AM	475	return cap_drop(a, __cap_fs_set);
1da177e4 LT	476	}
1da177e4 LT	477
e338d263 AM	478	static inline kernel_cap_t cap_raise_fs_set(const kernel_cap_t a,
e338d263 AM	479	const kernel_cap_t permitted)
1da177e4	480	{
e338d263 AM	481	const kernel_cap_t __cap_fs_set = CAP_FS_SET;
	482	return cap_combine(a,
	483	cap_intersect(permitted, __cap_fs_set));
1da177e4 LT	484	}
1da177e4 LT	485
e338d263	486	static inline kernel_cap_t cap_drop_nfsd_set(const kernel_cap_t a)
1da177e4	487	{
e338d263 AM	488	const kernel_cap_t __cap_fs_set = CAP_NFSD_SET;
e338d263 AM	489	return cap_drop(a, __cap_fs_set);
1da177e4 LT	490	}
1da177e4 LT	491
e338d263 AM	492	static inline kernel_cap_t cap_raise_nfsd_set(const kernel_cap_t a,
	493	const kernel_cap_t permitted)
	494	{
	495	const kernel_cap_t __cap_nfsd_set = CAP_NFSD_SET;
	496	return cap_combine(a,
	497	cap_intersect(permitted, __cap_nfsd_set));
	498	}
1da177e4	499
e338d263 AM	500	extern const kernel_cap_t __cap_empty_set;
	501	extern const kernel_cap_t __cap_full_set;
	502	extern const kernel_cap_t __cap_init_eff_set;
1da177e4	503
086f7316 AM	504	kernel_cap_t cap_set_effective(const kernel_cap_t pE_new);
086f7316 AM	505
12b5989b CW	506	int capable(int cap);
12b5989b CW	507	int __capable(struct task_struct *t, int cap);
c59ede7b	508
1da177e4 LT	509	#endif /* __KERNEL__ */
	510
	511	#endif /* !_LINUX_CAPABILITY_H */