[mirror_ubuntu-bionic-kernel.git] / include / linux / ipc_namespace.h

#ifndef __IPC_NAMESPACE_H__
#define __IPC_NAMESPACE_H__

#include <linux/err.h>
#include <linux/idr.h>
#include <linux/rwsem.h>
#include <linux/notifier.h>
#include <linux/nsproxy.h>

/*
 * ipc namespace events
 */
#define IPCNS_MEMCHANGED   0x00000001   /* Notify lowmem size changed */
#define IPCNS_CREATED  0x00000002   /* Notify new ipc namespace created */
#define IPCNS_REMOVED  0x00000003   /* Notify ipc namespace removed */

#define IPCNS_CALLBACK_PRI 0

struct user_namespace;

struct ipc_ids {
	int in_use;
	unsigned short seq;
	unsigned short seq_max;
	struct rw_semaphore rw_mutex;
	struct idr ipcs_idr;
};

struct ipc_namespace {
	atomic_t	count;
	struct ipc_ids	ids[3];

	int		sem_ctls[4];
	int		used_sems;

	int		msg_ctlmax;
	int		msg_ctlmnb;
	int		msg_ctlmni;
	atomic_t	msg_bytes;
	atomic_t	msg_hdrs;
	int		auto_msgmni;

	size_t		shm_ctlmax;
	size_t		shm_ctlall;
	int		shm_ctlmni;
	int		shm_tot;
	/*
	 * Defines whether IPC_RMID is forced for _all_ shm segments regardless
	 * of shmctl()
	 */
	int		shm_rmid_forced;

	struct notifier_block ipcns_nb;

	/* The kern_mount of the mqueuefs sb.  We take a ref on it */
	struct vfsmount	*mq_mnt;

	/* # queues in this ns, protected by mq_lock */
	unsigned int    mq_queues_count;

	/* next fields are set through sysctl */
	unsigned int    mq_queues_max;   /* initialized to DFLT_QUEUESMAX */
	unsigned int    mq_msg_max;      /* initialized to DFLT_MSGMAX */
	unsigned int    mq_msgsize_max;  /* initialized to DFLT_MSGSIZEMAX */

	/* user_ns which owns the ipc ns */
	struct user_namespace *user_ns;
};

extern struct ipc_namespace init_ipc_ns;
extern atomic_t nr_ipc_ns;

extern spinlock_t mq_lock;

#ifdef CONFIG_SYSVIPC
extern int register_ipcns_notifier(struct ipc_namespace *);
extern int cond_register_ipcns_notifier(struct ipc_namespace *);
extern void unregister_ipcns_notifier(struct ipc_namespace *);
extern int ipcns_notify(unsigned long);
extern void shm_destroy_orphaned(struct ipc_namespace *ns);
#else /* CONFIG_SYSVIPC */
static inline int register_ipcns_notifier(struct ipc_namespace *ns)
{ return 0; }
static inline int cond_register_ipcns_notifier(struct ipc_namespace *ns)
{ return 0; }
static inline void unregister_ipcns_notifier(struct ipc_namespace *ns) { }
static inline int ipcns_notify(unsigned long l) { return 0; }
static inline void shm_destroy_orphaned(struct ipc_namespace *ns) {}
#endif /* CONFIG_SYSVIPC */

#ifdef CONFIG_POSIX_MQUEUE
extern int mq_init_ns(struct ipc_namespace *ns);
/* default values */
#define DFLT_QUEUESMAX 256     /* max number of message queues */
#define DFLT_MSGMAX    10      /* max number of messages in each queue */
#define HARD_MSGMAX    (32768*sizeof(void *)/4)
#define DFLT_MSGSIZEMAX 8192   /* max message size */
#else
static inline int mq_init_ns(struct ipc_namespace *ns) { return 0; }
#endif

#if defined(CONFIG_IPC_NS)
extern struct ipc_namespace *copy_ipcs(unsigned long flags,
				       struct task_struct *tsk);
static inline struct ipc_namespace *get_ipc_ns(struct ipc_namespace *ns)
{
	if (ns)
		atomic_inc(&ns->count);
	return ns;
}

extern void put_ipc_ns(struct ipc_namespace *ns);
#else
static inline struct ipc_namespace *copy_ipcs(unsigned long flags,
					      struct task_struct *tsk)
{
	if (flags & CLONE_NEWIPC)
		return ERR_PTR(-EINVAL);

	return tsk->nsproxy->ipc_ns;
}

static inline struct ipc_namespace *get_ipc_ns(struct ipc_namespace *ns)
{
	return ns;
}

static inline void put_ipc_ns(struct ipc_namespace *ns)
{
}
#endif

#ifdef CONFIG_POSIX_MQUEUE_SYSCTL

struct ctl_table_header;
extern struct ctl_table_header *mq_register_sysctl_table(void);

#else /* CONFIG_POSIX_MQUEUE_SYSCTL */

static inline struct ctl_table_header *mq_register_sysctl_table(void)
{
	return NULL;
}

#endif /* CONFIG_POSIX_MQUEUE_SYSCTL */
#endif
Commit	Line	Data
	1	#ifndef __IPC_NAMESPACE_H__
	2	#define __IPC_NAMESPACE_H__
	3
	4	#include <linux/err.h>
	5	#include <linux/idr.h>
	6	#include <linux/rwsem.h>
	7	#include <linux/notifier.h>
	8	#include <linux/nsproxy.h>
	9
	10	/*
	11	* ipc namespace events
	12	*/
	13	#define IPCNS_MEMCHANGED 0x00000001 /* Notify lowmem size changed */
	14	#define IPCNS_CREATED 0x00000002 /* Notify new ipc namespace created */
	15	#define IPCNS_REMOVED 0x00000003 /* Notify ipc namespace removed */
	16
	17	#define IPCNS_CALLBACK_PRI 0
	18
	19	struct user_namespace;
	20
	21	struct ipc_ids {
	22	int in_use;
	23	unsigned short seq;
	24	unsigned short seq_max;
	25	struct rw_semaphore rw_mutex;
	26	struct idr ipcs_idr;
	27	};
	28
	29	struct ipc_namespace {
	30	atomic_t count;
	31	struct ipc_ids ids[3];
	32
	33	int sem_ctls[4];
	34	int used_sems;
	35
	36	int msg_ctlmax;
	37	int msg_ctlmnb;
	38	int msg_ctlmni;
	39	atomic_t msg_bytes;
	40	atomic_t msg_hdrs;
	41	int auto_msgmni;
	42
	43	size_t shm_ctlmax;
	44	size_t shm_ctlall;
	45	int shm_ctlmni;
	46	int shm_tot;
	47	/*
	48	* Defines whether IPC_RMID is forced for _all_ shm segments regardless
	49	* of shmctl()
	50	*/
	51	int shm_rmid_forced;
	52
	53	struct notifier_block ipcns_nb;
	54
	55	/* The kern_mount of the mqueuefs sb. We take a ref on it */
	56	struct vfsmount *mq_mnt;
	57
	58	/* # queues in this ns, protected by mq_lock */
	59	unsigned int mq_queues_count;
	60
	61	/* next fields are set through sysctl */
	62	unsigned int mq_queues_max; /* initialized to DFLT_QUEUESMAX */
	63	unsigned int mq_msg_max; /* initialized to DFLT_MSGMAX */
	64	unsigned int mq_msgsize_max; /* initialized to DFLT_MSGSIZEMAX */
	65
	66	/* user_ns which owns the ipc ns */
	67	struct user_namespace *user_ns;
	68	};
	69
	70	extern struct ipc_namespace init_ipc_ns;
	71	extern atomic_t nr_ipc_ns;
	72
	73	extern spinlock_t mq_lock;
	74
	75	#ifdef CONFIG_SYSVIPC
	76	extern int register_ipcns_notifier(struct ipc_namespace *);
	77	extern int cond_register_ipcns_notifier(struct ipc_namespace *);
	78	extern void unregister_ipcns_notifier(struct ipc_namespace *);
	79	extern int ipcns_notify(unsigned long);
	80	extern void shm_destroy_orphaned(struct ipc_namespace *ns);
	81	#else /* CONFIG_SYSVIPC */
	82	static inline int register_ipcns_notifier(struct ipc_namespace *ns)
	83	{ return 0; }
	84	static inline int cond_register_ipcns_notifier(struct ipc_namespace *ns)
	85	{ return 0; }
	86	static inline void unregister_ipcns_notifier(struct ipc_namespace *ns) { }
	87	static inline int ipcns_notify(unsigned long l) { return 0; }
	88	static inline void shm_destroy_orphaned(struct ipc_namespace *ns) {}
	89	#endif /* CONFIG_SYSVIPC */
	90
	91	#ifdef CONFIG_POSIX_MQUEUE
	92	extern int mq_init_ns(struct ipc_namespace *ns);
	93	/* default values */
	94	#define DFLT_QUEUESMAX 256 /* max number of message queues */
	95	#define DFLT_MSGMAX 10 /* max number of messages in each queue */
	96	#define HARD_MSGMAX (32768sizeof(void )/4)
	97	#define DFLT_MSGSIZEMAX 8192 /* max message size */
	98	#else
	99	static inline int mq_init_ns(struct ipc_namespace *ns) { return 0; }
	100	#endif
	101
	102	#if defined(CONFIG_IPC_NS)
	103	extern struct ipc_namespace *copy_ipcs(unsigned long flags,
	104	struct task_struct *tsk);
	105	static inline struct ipc_namespace get_ipc_ns(struct ipc_namespace ns)
	106	{
	107	if (ns)
	108	atomic_inc(&ns->count);
	109	return ns;
	110	}
	111
	112	extern void put_ipc_ns(struct ipc_namespace *ns);
	113	#else
	114	static inline struct ipc_namespace *copy_ipcs(unsigned long flags,
	115	struct task_struct *tsk)
	116	{
	117	if (flags & CLONE_NEWIPC)
	118	return ERR_PTR(-EINVAL);
	119
	120	return tsk->nsproxy->ipc_ns;
	121	}
	122
	123	static inline struct ipc_namespace get_ipc_ns(struct ipc_namespace ns)
	124	{
	125	return ns;
	126	}
	127
	128	static inline void put_ipc_ns(struct ipc_namespace *ns)
	129	{
	130	}
	131	#endif
	132
	133	#ifdef CONFIG_POSIX_MQUEUE_SYSCTL
	134
	135	struct ctl_table_header;
	136	extern struct ctl_table_header *mq_register_sysctl_table(void);
	137
	138	#else /* CONFIG_POSIX_MQUEUE_SYSCTL */
	139
	140	static inline struct ctl_table_header *mq_register_sysctl_table(void)
	141	{
	142	return NULL;
	143	}
	144
	145	#endif /* CONFIG_POSIX_MQUEUE_SYSCTL */
	146	#endif