[linux.git] / ipc / util.h

/* SPDX-License-Identifier: GPL-2.0 */
/*
 * linux/ipc/util.h
 * Copyright (C) 1999 Christoph Rohland
 *
 * ipc helper functions (c) 1999 Manfred Spraul <[email protected]>
 * namespaces support.      2006 OpenVZ, SWsoft Inc.
 *                               Pavel Emelianov <[email protected]>
 */

#ifndef _IPC_UTIL_H
#define _IPC_UTIL_H

#include <linux/unistd.h>
#include <linux/err.h>
#include <linux/ipc_namespace.h>

/*
 * The IPC ID contains 2 separate numbers - index and sequence number.
 * By default,
 *   bits  0-14: index (32k, 15 bits)
 *   bits 15-30: sequence number (64k, 16 bits)
 *
 * When IPCMNI extension mode is turned on, the composition changes:
 *   bits  0-23: index (16M, 24 bits)
 *   bits 24-30: sequence number (128, 7 bits)
 */
#define IPCMNI_SHIFT		15
#define IPCMNI_EXTEND_SHIFT	24
#define IPCMNI_EXTEND_MIN_CYCLE	(RADIX_TREE_MAP_SIZE * RADIX_TREE_MAP_SIZE)
#define IPCMNI			(1 << IPCMNI_SHIFT)
#define IPCMNI_EXTEND		(1 << IPCMNI_EXTEND_SHIFT)

#ifdef CONFIG_SYSVIPC_SYSCTL
extern int ipc_mni;
extern int ipc_mni_shift;
extern int ipc_min_cycle;

#define ipcmni_seq_shift()	ipc_mni_shift
#define IPCMNI_IDX_MASK		((1 << ipc_mni_shift) - 1)

#else /* CONFIG_SYSVIPC_SYSCTL */

#define ipc_mni			IPCMNI
#define ipc_min_cycle		((int)RADIX_TREE_MAP_SIZE)
#define ipcmni_seq_shift()	IPCMNI_SHIFT
#define IPCMNI_IDX_MASK		((1 << IPCMNI_SHIFT) - 1)
#endif /* CONFIG_SYSVIPC_SYSCTL */

void sem_init(void);
void msg_init(void);
void shm_init(void);

struct ipc_namespace;
struct pid_namespace;

#ifdef CONFIG_POSIX_MQUEUE
extern void mq_clear_sbinfo(struct ipc_namespace *ns);
extern void mq_put_mnt(struct ipc_namespace *ns);
#else
static inline void mq_clear_sbinfo(struct ipc_namespace *ns) { }
static inline void mq_put_mnt(struct ipc_namespace *ns) { }
#endif

#ifdef CONFIG_SYSVIPC
void sem_init_ns(struct ipc_namespace *ns);
void msg_init_ns(struct ipc_namespace *ns);
void shm_init_ns(struct ipc_namespace *ns);

void sem_exit_ns(struct ipc_namespace *ns);
void msg_exit_ns(struct ipc_namespace *ns);
void shm_exit_ns(struct ipc_namespace *ns);
#else
static inline void sem_init_ns(struct ipc_namespace *ns) { }
static inline void msg_init_ns(struct ipc_namespace *ns) { }
static inline void shm_init_ns(struct ipc_namespace *ns) { }

static inline void sem_exit_ns(struct ipc_namespace *ns) { }
static inline void msg_exit_ns(struct ipc_namespace *ns) { }
static inline void shm_exit_ns(struct ipc_namespace *ns) { }
#endif

/*
 * Structure that holds the parameters needed by the ipc operations
 * (see after)
 */
struct ipc_params {
	key_t key;
	int flg;
	union {
		size_t size;	/* for shared memories */
		int nsems;	/* for semaphores */
	} u;			/* holds the getnew() specific param */
};

/*
 * Structure that holds some ipc operations. This structure is used to unify
 * the calls to sys_msgget(), sys_semget(), sys_shmget()
 *      . routine to call to create a new ipc object. Can be one of newque,
 *        newary, newseg
 *      . routine to call to check permissions for a new ipc object.
 *        Can be one of security_msg_associate, security_sem_associate,
 *        security_shm_associate
 *      . routine to call for an extra check if needed
 */
struct ipc_ops {
	int (*getnew)(struct ipc_namespace *, struct ipc_params *);
	int (*associate)(struct kern_ipc_perm *, int);
	int (*more_checks)(struct kern_ipc_perm *, struct ipc_params *);
};

struct seq_file;
struct ipc_ids;

void ipc_init_ids(struct ipc_ids *ids);
#ifdef CONFIG_PROC_FS
void __init ipc_init_proc_interface(const char *path, const char *header,
		int ids, int (*show)(struct seq_file *, void *));
struct pid_namespace *ipc_seq_pid_ns(struct seq_file *);
#else
#define ipc_init_proc_interface(path, header, ids, show) do {} while (0)
#endif

#define IPC_SEM_IDS	0
#define IPC_MSG_IDS	1
#define IPC_SHM_IDS	2

#define ipcid_to_idx(id)  ((id) & IPCMNI_IDX_MASK)
#define ipcid_to_seqx(id) ((id) >> ipcmni_seq_shift())
#define ipcid_seq_max()	  (INT_MAX >> ipcmni_seq_shift())

/* must be called with ids->rwsem acquired for writing */
int ipc_addid(struct ipc_ids *, struct kern_ipc_perm *, int);

/* must be called with both locks acquired. */
void ipc_rmid(struct ipc_ids *, struct kern_ipc_perm *);

/* must be called with both locks acquired. */
void ipc_set_key_private(struct ipc_ids *, struct kern_ipc_perm *);

/* must be called with ipcp locked */
int ipcperms(struct ipc_namespace *ns, struct kern_ipc_perm *ipcp, short flg);

/**
 * ipc_get_maxidx - get the highest assigned index
 * @ids: ipc identifier set
 *
 * The function returns the highest assigned index for @ids. The function
 * doesn't scan the idr tree, it uses a cached value.
 *
 * Called with ipc_ids.rwsem held for reading.
 */
static inline int ipc_get_maxidx(struct ipc_ids *ids)
{
	if (ids->in_use == 0)
		return -1;

	if (ids->in_use == ipc_mni)
		return ipc_mni - 1;

	return ids->max_idx;
}

/*
 * For allocation that need to be freed by RCU.
 * Objects are reference counted, they start with reference count 1.
 * getref increases the refcount, the putref call that reduces the recount
 * to 0 schedules the rcu destruction. Caller must guarantee locking.
 *
 * refcount is initialized by ipc_addid(), before that point call_rcu()
 * must be used.
 */
bool ipc_rcu_getref(struct kern_ipc_perm *ptr);
void ipc_rcu_putref(struct kern_ipc_perm *ptr,
			void (*func)(struct rcu_head *head));

struct kern_ipc_perm *ipc_obtain_object_idr(struct ipc_ids *ids, int id);

void kernel_to_ipc64_perm(struct kern_ipc_perm *in, struct ipc64_perm *out);
void ipc64_perm_to_ipc_perm(struct ipc64_perm *in, struct ipc_perm *out);
int ipc_update_perm(struct ipc64_perm *in, struct kern_ipc_perm *out);
struct kern_ipc_perm *ipcctl_obtain_check(struct ipc_namespace *ns,
					     struct ipc_ids *ids, int id, int cmd,
					     struct ipc64_perm *perm, int extra_perm);

static inline void ipc_update_pid(struct pid **pos, struct pid *pid)
{
	struct pid *old = *pos;
	if (old != pid) {
		*pos = get_pid(pid);
		put_pid(old);
	}
}

#ifdef CONFIG_ARCH_WANT_IPC_PARSE_VERSION
int ipc_parse_version(int *cmd);
#endif

extern void free_msg(struct msg_msg *msg);
extern struct msg_msg *load_msg(const void __user *src, size_t len);
extern struct msg_msg *copy_msg(struct msg_msg *src, struct msg_msg *dst);
extern int store_msg(void __user *dest, struct msg_msg *msg, size_t len);

static inline int ipc_checkid(struct kern_ipc_perm *ipcp, int id)
{
	return ipcid_to_seqx(id) != ipcp->seq;
}

static inline void ipc_lock_object(struct kern_ipc_perm *perm)
{
	spin_lock(&perm->lock);
}

static inline void ipc_unlock_object(struct kern_ipc_perm *perm)
{
	spin_unlock(&perm->lock);
}

static inline void ipc_assert_locked_object(struct kern_ipc_perm *perm)
{
	assert_spin_locked(&perm->lock);
}

static inline void ipc_unlock(struct kern_ipc_perm *perm)
{
	ipc_unlock_object(perm);
	rcu_read_unlock();
}

/*
 * ipc_valid_object() - helper to sort out IPC_RMID races for codepaths
 * where the respective ipc_ids.rwsem is not being held down.
 * Checks whether the ipc object is still around or if it's gone already, as
 * ipc_rmid() may have already freed the ID while the ipc lock was spinning.
 * Needs to be called with kern_ipc_perm.lock held -- exception made for one
 * checkpoint case at sys_semtimedop() as noted in code commentary.
 */
static inline bool ipc_valid_object(struct kern_ipc_perm *perm)
{
	return !perm->deleted;
}

struct kern_ipc_perm *ipc_obtain_object_check(struct ipc_ids *ids, int id);
int ipcget(struct ipc_namespace *ns, struct ipc_ids *ids,
			const struct ipc_ops *ops, struct ipc_params *params);
void free_ipcs(struct ipc_namespace *ns, struct ipc_ids *ids,
		void (*free)(struct ipc_namespace *, struct kern_ipc_perm *));

static inline int sem_check_semmni(struct ipc_namespace *ns) {
	/*
	 * Check semmni range [0, ipc_mni]
	 * semmni is the last element of sem_ctls[4] array
	 */
	return ((ns->sem_ctls[3] < 0) || (ns->sem_ctls[3] > ipc_mni))
		? -ERANGE : 0;
}

#ifdef CONFIG_COMPAT
#include <linux/compat.h>
struct compat_ipc_perm {
	key_t key;
	__compat_uid_t uid;
	__compat_gid_t gid;
	__compat_uid_t cuid;
	__compat_gid_t cgid;
	compat_mode_t mode;
	unsigned short seq;
};

void to_compat_ipc_perm(struct compat_ipc_perm *, struct ipc64_perm *);
void to_compat_ipc64_perm(struct compat_ipc64_perm *, struct ipc64_perm *);
int get_compat_ipc_perm(struct ipc64_perm *, struct compat_ipc_perm __user *);
int get_compat_ipc64_perm(struct ipc64_perm *,
			  struct compat_ipc64_perm __user *);

static inline int compat_ipc_parse_version(int *cmd)
{
	int version = *cmd & IPC_64;
	*cmd &= ~IPC_64;
	return version;
}

long compat_ksys_old_semctl(int semid, int semnum, int cmd, int arg);
long compat_ksys_old_msgctl(int msqid, int cmd, void __user *uptr);
long compat_ksys_msgrcv(int msqid, compat_uptr_t msgp, compat_ssize_t msgsz,
			compat_long_t msgtyp, int msgflg);
long compat_ksys_msgsnd(int msqid, compat_uptr_t msgp,
		       compat_ssize_t msgsz, int msgflg);
long compat_ksys_old_shmctl(int shmid, int cmd, void __user *uptr);

#endif

#endif
Commit	Line	Data
b2441318	1	/* SPDX-License-Identifier: GPL-2.0 */
1da177e4 LT	2	/*
	3	* linux/ipc/util.h
	4	* Copyright (C) 1999 Christoph Rohland
	5	*
624dffcb	6	* ipc helper functions (c) 1999 Manfred Spraul <[email protected]>
73ea4130 KK	7	* namespaces support. 2006 OpenVZ, SWsoft Inc.
73ea4130 KK	8	* Pavel Emelianov <[email protected]>
1da177e4 LT	9	*/
	10
	11	#ifndef _IPC_UTIL_H
	12	#define _IPC_UTIL_H
	13
232086b1	14	#include <linux/unistd.h>
023a5355	15	#include <linux/err.h>
15df03c8	16	#include <linux/ipc_namespace.h>
7ca7e564	17
5ac893b8 WL	18	/*
	19	* The IPC ID contains 2 separate numbers - index and sequence number.
	20	* By default,
	21	* bits 0-14: index (32k, 15 bits)
	22	* bits 15-30: sequence number (64k, 16 bits)
	23	*
	24	* When IPCMNI extension mode is turned on, the composition changes:
	25	* bits 0-23: index (16M, 24 bits)
	26	* bits 24-30: sequence number (128, 7 bits)
	27	*/
	28	#define IPCMNI_SHIFT 15
	29	#define IPCMNI_EXTEND_SHIFT 24
99db46ea	30	#define IPCMNI_EXTEND_MIN_CYCLE (RADIX_TREE_MAP_SIZE * RADIX_TREE_MAP_SIZE)
5ac893b8 WL	31	#define IPCMNI (1 << IPCMNI_SHIFT)
	32	#define IPCMNI_EXTEND (1 << IPCMNI_EXTEND_SHIFT)
	33
	34	#ifdef CONFIG_SYSVIPC_SYSCTL
	35	extern int ipc_mni;
	36	extern int ipc_mni_shift;
99db46ea	37	extern int ipc_min_cycle;
5ac893b8	38
3278a2c2	39	#define ipcmni_seq_shift() ipc_mni_shift
5ac893b8 WL	40	#define IPCMNI_IDX_MASK ((1 << ipc_mni_shift) - 1)
	41
	42	#else /* CONFIG_SYSVIPC_SYSCTL */
	43
	44	#define ipc_mni IPCMNI
99db46ea	45	#define ipc_min_cycle ((int)RADIX_TREE_MAP_SIZE)
3278a2c2	46	#define ipcmni_seq_shift() IPCMNI_SHIFT
5ac893b8 WL	47	#define IPCMNI_IDX_MASK ((1 << IPCMNI_SHIFT) - 1)
5ac893b8 WL	48	#endif /* CONFIG_SYSVIPC_SYSCTL */
1da177e4	49
eae04d25 DB	50	void sem_init(void);
eae04d25 DB	51	void msg_init(void);
239521f3	52	void shm_init(void);
1da177e4	53
ae5e1b22	54	struct ipc_namespace;
03f1fc09	55	struct pid_namespace;
ae5e1b22	56
614b84cf	57	#ifdef CONFIG_POSIX_MQUEUE
7eafd7c7 SH	58	extern void mq_clear_sbinfo(struct ipc_namespace *ns);
7eafd7c7 SH	59	extern void mq_put_mnt(struct ipc_namespace *ns);
614b84cf	60	#else
7eafd7c7 SH	61	static inline void mq_clear_sbinfo(struct ipc_namespace *ns) { }
7eafd7c7 SH	62	static inline void mq_put_mnt(struct ipc_namespace *ns) { }
614b84cf SH	63	#endif
	64
	65	#ifdef CONFIG_SYSVIPC
eae04d25 DB	66	void sem_init_ns(struct ipc_namespace *ns);
	67	void msg_init_ns(struct ipc_namespace *ns);
	68	void shm_init_ns(struct ipc_namespace *ns);
73ea4130 KK	69
	70	void sem_exit_ns(struct ipc_namespace *ns);
	71	void msg_exit_ns(struct ipc_namespace *ns);
	72	void shm_exit_ns(struct ipc_namespace *ns);
614b84cf	73	#else
eae04d25 DB	74	static inline void sem_init_ns(struct ipc_namespace *ns) { }
	75	static inline void msg_init_ns(struct ipc_namespace *ns) { }
	76	static inline void shm_init_ns(struct ipc_namespace *ns) { }
614b84cf SH	77
	78	static inline void sem_exit_ns(struct ipc_namespace *ns) { }
	79	static inline void msg_exit_ns(struct ipc_namespace *ns) { }
	80	static inline void shm_exit_ns(struct ipc_namespace *ns) { }
	81	#endif
73ea4130	82
7748dbfa ND	83	/*
	84	* Structure that holds the parameters needed by the ipc operations
	85	* (see after)
	86	*/
	87	struct ipc_params {
	88	key_t key;
	89	int flg;
	90	union {
	91	size_t size; /* for shared memories */
	92	int nsems; /* for semaphores */
	93	} u; /* holds the getnew() specific param */
	94	};
	95
	96	/*
	97	* Structure that holds some ipc operations. This structure is used to unify
	98	* the calls to sys_msgget(), sys_semget(), sys_shmget()
	99	* . routine to call to create a new ipc object. Can be one of newque,
	100	* newary, newseg
f4566f04	101	* . routine to call to check permissions for a new ipc object.
7748dbfa ND	102	* Can be one of security_msg_associate, security_sem_associate,
	103	* security_shm_associate
	104	* . routine to call for an extra check if needed
	105	*/
	106	struct ipc_ops {
46c0a8ca PM	107	int (getnew)(struct ipc_namespace , struct ipc_params *);
	108	int (associate)(struct kern_ipc_perm , int);
	109	int (more_checks)(struct kern_ipc_perm , struct ipc_params *);
7748dbfa ND	110	};
7748dbfa ND	111
ae781774	112	struct seq_file;
ed2ddbf8	113	struct ipc_ids;
7d69a1f4	114
eae04d25	115	void ipc_init_ids(struct ipc_ids *ids);
ae781774 MW	116	#ifdef CONFIG_PROC_FS
ae781774 MW	117	void __init ipc_init_proc_interface(const char path, const char header,
73ea4130	118	int ids, int (show)(struct seq_file , void *));
03f1fc09	119	struct pid_namespace ipc_seq_pid_ns(struct seq_file );
ae781774 MW	120	#else
	121	#define ipc_init_proc_interface(path, header, ids, show) do {} while (0)
	122	#endif
1da177e4	123
73ea4130 KK	124	#define IPC_SEM_IDS 0
	125	#define IPC_MSG_IDS 1
	126	#define IPC_SHM_IDS 2
	127
5ac893b8	128	#define ipcid_to_idx(id) ((id) & IPCMNI_IDX_MASK)
3278a2c2 MS	129	#define ipcid_to_seqx(id) ((id) >> ipcmni_seq_shift())
3278a2c2 MS	130	#define ipcid_seq_max() (INT_MAX >> ipcmni_seq_shift())
ce621f5b	131
d9a605e4	132	/* must be called with ids->rwsem acquired for writing */
7ca7e564	133	int ipc_addid(struct ipc_ids , struct kern_ipc_perm , int);
3e148c79	134
1da177e4	135	/* must be called with both locks acquired. */
7ca7e564	136	void ipc_rmid(struct ipc_ids , struct kern_ipc_perm );
1da177e4	137
0cfb6aee GK	138	/* must be called with both locks acquired. */
	139	void ipc_set_key_private(struct ipc_ids , struct kern_ipc_perm );
	140
f4566f04	141	/* must be called with ipcp locked */
b0e77598	142	int ipcperms(struct ipc_namespace ns, struct kern_ipc_perm ipcp, short flg);
1da177e4	143
15df03c8	144	/**
27c331a1	145	* ipc_get_maxidx - get the highest assigned index
15df03c8 DB	146	* @ids: ipc identifier set
15df03c8 DB	147	*
b869d5be MS	148	* The function returns the highest assigned index for @ids. The function
	149	* doesn't scan the idr tree, it uses a cached value.
	150	*
15df03c8 DB	151	* Called with ipc_ids.rwsem held for reading.
15df03c8 DB	152	*/
27c331a1	153	static inline int ipc_get_maxidx(struct ipc_ids *ids)
15df03c8 DB	154	{
	155	if (ids->in_use == 0)
	156	return -1;
	157
5ac893b8 WL	158	if (ids->in_use == ipc_mni)
5ac893b8 WL	159	return ipc_mni - 1;
15df03c8	160
27c331a1	161	return ids->max_idx;
15df03c8 DB	162	}
15df03c8 DB	163
1da177e4 LT	164	/*
	165	* For allocation that need to be freed by RCU.
	166	* Objects are reference counted, they start with reference count 1.
	167	* getref increases the refcount, the putref call that reduces the recount
	168	* to 0 schedules the rcu destruction. Caller must guarantee locking.
62b49c99 MS	169	*
	170	* refcount is initialized by ipc_addid(), before that point call_rcu()
	171	* must be used.
1da177e4	172	*/
2a9d6481	173	bool ipc_rcu_getref(struct kern_ipc_perm *ptr);
dba4cdd3 MS	174	void ipc_rcu_putref(struct kern_ipc_perm *ptr,
dba4cdd3 MS	175	void (func)(struct rcu_head head));
1da177e4	176
55b7ae50	177	struct kern_ipc_perm ipc_obtain_object_idr(struct ipc_ids ids, int id);
1da177e4 LT	178
	179	void kernel_to_ipc64_perm(struct kern_ipc_perm in, struct ipc64_perm out);
	180	void ipc64_perm_to_ipc_perm(struct ipc64_perm in, struct ipc_perm out);
1efdb69b	181	int ipc_update_perm(struct ipc64_perm in, struct kern_ipc_perm out);
4241c1a3	182	struct kern_ipc_perm ipcctl_obtain_check(struct ipc_namespace ns,
444d0f62 DB	183	struct ipc_ids *ids, int id, int cmd,
444d0f62 DB	184	struct ipc64_perm *perm, int extra_perm);
1da177e4	185
03f1fc09 EB	186	static inline void ipc_update_pid(struct pid *pos, struct pid pid)
	187	{
	188	struct pid old = pos;
	189	if (old != pid) {
	190	*pos = get_pid(pid);
	191	put_pid(old);
	192	}
	193	}
	194
275f2214	195	#ifdef CONFIG_ARCH_WANT_IPC_PARSE_VERSION
239521f3	196	int ipc_parse_version(int *cmd);
1da177e4 LT	197	#endif
	198
	199	extern void free_msg(struct msg_msg *msg);
4e9b45a1	200	extern struct msg_msg load_msg(const void __user src, size_t len);
4a674f34	201	extern struct msg_msg copy_msg(struct msg_msg src, struct msg_msg *dst);
4e9b45a1	202	extern int store_msg(void __user dest, struct msg_msg msg, size_t len);
7748dbfa	203
27c331a1	204	static inline int ipc_checkid(struct kern_ipc_perm *ipcp, int id)
023a5355	205	{
27c331a1	206	return ipcid_to_seqx(id) != ipcp->seq;
023a5355 ND	207	}
023a5355 ND	208
1ca7003a	209	static inline void ipc_lock_object(struct kern_ipc_perm *perm)
023a5355	210	{
023a5355 ND	211	spin_lock(&perm->lock);
	212	}
	213
1ca7003a	214	static inline void ipc_unlock_object(struct kern_ipc_perm *perm)
023a5355 ND	215	{
023a5355 ND	216	spin_unlock(&perm->lock);
023a5355 ND	217	}
023a5355 ND	218
1ca7003a	219	static inline void ipc_assert_locked_object(struct kern_ipc_perm *perm)
16df3674	220	{
1ca7003a DB	221	assert_spin_locked(&perm->lock);
	222	}
	223
1ca7003a DB	224	static inline void ipc_unlock(struct kern_ipc_perm *perm)
1ca7003a DB	225	{
cf9d5d78	226	ipc_unlock_object(perm);
1ca7003a DB	227	rcu_read_unlock();
	228	}
	229
0f3d2b01 RA	230	/*
	231	* ipc_valid_object() - helper to sort out IPC_RMID races for codepaths
	232	* where the respective ipc_ids.rwsem is not being held down.
	233	* Checks whether the ipc object is still around or if it's gone already, as
	234	* ipc_rmid() may have already freed the ID while the ipc lock was spinning.
	235	* Needs to be called with kern_ipc_perm.lock held -- exception made for one
	236	* checkpoint case at sys_semtimedop() as noted in code commentary.
	237	*/
	238	static inline bool ipc_valid_object(struct kern_ipc_perm *perm)
	239	{
72a8ff2f	240	return !perm->deleted;
0f3d2b01 RA	241	}
0f3d2b01 RA	242
4d2bff5e	243	struct kern_ipc_perm ipc_obtain_object_check(struct ipc_ids ids, int id);
b2d75cdd	244	int ipcget(struct ipc_namespace ns, struct ipc_ids ids,
eb66ec44	245	const struct ipc_ops ops, struct ipc_params params);
665c7741 AD	246	void free_ipcs(struct ipc_namespace ns, struct ipc_ids ids,
665c7741 AD	247	void (free)(struct ipc_namespace , struct kern_ipc_perm *));
553f770e	248
8c81ddd2 WL	249	static inline int sem_check_semmni(struct ipc_namespace *ns) {
8c81ddd2 WL	250	/*
5ac893b8	251	* Check semmni range [0, ipc_mni]
8c81ddd2 WL	252	* semmni is the last element of sem_ctls[4] array
8c81ddd2 WL	253	*/
5ac893b8	254	return ((ns->sem_ctls[3] < 0) \|\| (ns->sem_ctls[3] > ipc_mni))
8c81ddd2 WL	255	? -ERANGE : 0;
	256	}
	257
553f770e AV	258	#ifdef CONFIG_COMPAT
	259	#include <linux/compat.h>
	260	struct compat_ipc_perm {
	261	key_t key;
	262	__compat_uid_t uid;
	263	__compat_gid_t gid;
	264	__compat_uid_t cuid;
	265	__compat_gid_t cgid;
	266	compat_mode_t mode;
	267	unsigned short seq;
	268	};
	269
c0ebccb6 AV	270	void to_compat_ipc_perm(struct compat_ipc_perm , struct ipc64_perm );
	271	void to_compat_ipc64_perm(struct compat_ipc64_perm , struct ipc64_perm );
	272	int get_compat_ipc_perm(struct ipc64_perm , struct compat_ipc_perm __user );
	273	int get_compat_ipc64_perm(struct ipc64_perm *,
	274	struct compat_ipc64_perm __user *);
	275
553f770e AV	276	static inline int compat_ipc_parse_version(int *cmd)
553f770e AV	277	{
553f770e AV	278	int version = *cmd & IPC_64;
	279	*cmd &= ~IPC_64;
	280	return version;
553f770e	281	}
41f4f0e2	282
275f2214 AB	283	long compat_ksys_old_semctl(int semid, int semnum, int cmd, int arg);
275f2214 AB	284	long compat_ksys_old_msgctl(int msqid, int cmd, void __user *uptr);
078faac9 DB	285	long compat_ksys_msgrcv(int msqid, compat_uptr_t msgp, compat_ssize_t msgsz,
078faac9 DB	286	compat_long_t msgtyp, int msgflg);
31c213f2 DB	287	long compat_ksys_msgsnd(int msqid, compat_uptr_t msgp,
31c213f2 DB	288	compat_ssize_t msgsz, int msgflg);
275f2214	289	long compat_ksys_old_shmctl(int shmid, int cmd, void __user *uptr);
fb377eb8 AB	290
fb377eb8 AB	291	#endif
41f4f0e2	292
1da177e4	293	#endif