[linux-2.6-block.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>
#include <linux/ns_common.h>

struct user_namespace;

struct ipc_ids {
	int in_use;
	unsigned short seq;
	struct rw_semaphore rwsem;
	struct idr ipcs_idr;
	int next_id;
};

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

	int		sem_ctls[4];
	int		used_sems;

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

	size_t		shm_ctlmax;
	size_t		shm_ctlall;
	unsigned long	shm_tot;
	int		shm_ctlmni;
	/*
	 * 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 */
	unsigned int    mq_msg_default;
	unsigned int    mq_msgsize_default;

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

	struct ns_common ns;
};

extern struct ipc_namespace init_ipc_ns;
extern atomic_t nr_ipc_ns;

extern spinlock_t mq_lock;

#ifdef CONFIG_SYSVIPC
extern void shm_destroy_orphaned(struct ipc_namespace *ns);
#else /* CONFIG_SYSVIPC */
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);
/*
 * POSIX Message Queue default values:
 *
 * MIN_*: Lowest value an admin can set the maximum unprivileged limit to
 * DFLT_*MAX: Default values for the maximum unprivileged limits
 * DFLT_{MSG,MSGSIZE}: Default values used when the user doesn't supply
 *   an attribute to the open call and the queue must be created
 * HARD_*: Highest value the maximums can be set to.  These are enforced
 *   on CAP_SYS_RESOURCE apps as well making them inviolate (so make them
 *   suitably high)
 *
 * POSIX Requirements:
 *   Per app minimum openable message queues - 8.  This does not map well
 *     to the fact that we limit the number of queues on a per namespace
 *     basis instead of a per app basis.  So, make the default high enough
 *     that no given app should have a hard time opening 8 queues.
 *   Minimum maximum for HARD_MSGMAX - 32767.  I bumped this to 65536.
 *   Minimum maximum for HARD_MSGSIZEMAX - POSIX is silent on this.  However,
 *     we have run into a situation where running applications in the wild
 *     require this to be at least 5MB, and preferably 10MB, so I set the
 *     value to 16MB in hopes that this user is the worst of the bunch and
 *     the new maximum will handle anyone else.  I may have to revisit this
 *     in the future.
 */
#define DFLT_QUEUESMAX		      256
#define MIN_MSGMAX			1
#define DFLT_MSG		       10U
#define DFLT_MSGMAX		       10
#define HARD_MSGMAX		    65536
#define MIN_MSGSIZEMAX		      128
#define DFLT_MSGSIZE		     8192U
#define DFLT_MSGSIZEMAX		     8192
#define HARD_MSGSIZEMAX	    (16*1024*1024)
#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 user_namespace *user_ns, struct ipc_namespace *ns);

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 user_namespace *user_ns, struct ipc_namespace *ns)
{
	if (flags & CLONE_NEWIPC)
		return ERR_PTR(-EINVAL);

	return 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	#include <linux/ns_common.h>
	10
	11	struct user_namespace;
	12
	13	struct ipc_ids {
	14	int in_use;
	15	unsigned short seq;
	16	struct rw_semaphore rwsem;
	17	struct idr ipcs_idr;
	18	int next_id;
	19	};
	20
	21	struct ipc_namespace {
	22	atomic_t count;
	23	struct ipc_ids ids[3];
	24
	25	int sem_ctls[4];
	26	int used_sems;
	27
	28	unsigned int msg_ctlmax;
	29	unsigned int msg_ctlmnb;
	30	unsigned int msg_ctlmni;
	31	atomic_t msg_bytes;
	32	atomic_t msg_hdrs;
	33
	34	size_t shm_ctlmax;
	35	size_t shm_ctlall;
	36	unsigned long shm_tot;
	37	int shm_ctlmni;
	38	/*
	39	* Defines whether IPC_RMID is forced for _all_ shm segments regardless
	40	* of shmctl()
	41	*/
	42	int shm_rmid_forced;
	43
	44	struct notifier_block ipcns_nb;
	45
	46	/* The kern_mount of the mqueuefs sb. We take a ref on it */
	47	struct vfsmount *mq_mnt;
	48
	49	/* # queues in this ns, protected by mq_lock */
	50	unsigned int mq_queues_count;
	51
	52	/* next fields are set through sysctl */
	53	unsigned int mq_queues_max; /* initialized to DFLT_QUEUESMAX */
	54	unsigned int mq_msg_max; /* initialized to DFLT_MSGMAX */
	55	unsigned int mq_msgsize_max; /* initialized to DFLT_MSGSIZEMAX */
	56	unsigned int mq_msg_default;
	57	unsigned int mq_msgsize_default;
	58
	59	/* user_ns which owns the ipc ns */
	60	struct user_namespace *user_ns;
	61
	62	struct ns_common ns;
	63	};
	64
	65	extern struct ipc_namespace init_ipc_ns;
	66	extern atomic_t nr_ipc_ns;
	67
	68	extern spinlock_t mq_lock;
	69
	70	#ifdef CONFIG_SYSVIPC
	71	extern void shm_destroy_orphaned(struct ipc_namespace *ns);
	72	#else /* CONFIG_SYSVIPC */
	73	static inline void shm_destroy_orphaned(struct ipc_namespace *ns) {}
	74	#endif /* CONFIG_SYSVIPC */
	75
	76	#ifdef CONFIG_POSIX_MQUEUE
	77	extern int mq_init_ns(struct ipc_namespace *ns);
	78	/*
	79	* POSIX Message Queue default values:
	80	*
	81	* MIN_*: Lowest value an admin can set the maximum unprivileged limit to
	82	* DFLT_*MAX: Default values for the maximum unprivileged limits
	83	* DFLT_{MSG,MSGSIZE}: Default values used when the user doesn't supply
	84	* an attribute to the open call and the queue must be created
	85	* HARD_*: Highest value the maximums can be set to. These are enforced
	86	* on CAP_SYS_RESOURCE apps as well making them inviolate (so make them
	87	* suitably high)
	88	*
	89	* POSIX Requirements:
	90	* Per app minimum openable message queues - 8. This does not map well
	91	* to the fact that we limit the number of queues on a per namespace
	92	* basis instead of a per app basis. So, make the default high enough
	93	* that no given app should have a hard time opening 8 queues.
	94	* Minimum maximum for HARD_MSGMAX - 32767. I bumped this to 65536.
	95	* Minimum maximum for HARD_MSGSIZEMAX - POSIX is silent on this. However,
	96	* we have run into a situation where running applications in the wild
	97	* require this to be at least 5MB, and preferably 10MB, so I set the
	98	* value to 16MB in hopes that this user is the worst of the bunch and
	99	* the new maximum will handle anyone else. I may have to revisit this
	100	* in the future.
	101	*/
	102	#define DFLT_QUEUESMAX 256
	103	#define MIN_MSGMAX 1
	104	#define DFLT_MSG 10U
	105	#define DFLT_MSGMAX 10
	106	#define HARD_MSGMAX 65536
	107	#define MIN_MSGSIZEMAX 128
	108	#define DFLT_MSGSIZE 8192U
	109	#define DFLT_MSGSIZEMAX 8192
	110	#define HARD_MSGSIZEMAX (1610241024)
	111	#else
	112	static inline int mq_init_ns(struct ipc_namespace *ns) { return 0; }
	113	#endif
	114
	115	#if defined(CONFIG_IPC_NS)
	116	extern struct ipc_namespace *copy_ipcs(unsigned long flags,
	117	struct user_namespace user_ns, struct ipc_namespace ns);
	118
	119	static inline struct ipc_namespace get_ipc_ns(struct ipc_namespace ns)
	120	{
	121	if (ns)
	122	atomic_inc(&ns->count);
	123	return ns;
	124	}
	125
	126	extern void put_ipc_ns(struct ipc_namespace *ns);
	127	#else
	128	static inline struct ipc_namespace *copy_ipcs(unsigned long flags,
	129	struct user_namespace user_ns, struct ipc_namespace ns)
	130	{
	131	if (flags & CLONE_NEWIPC)
	132	return ERR_PTR(-EINVAL);
	133
	134	return ns;
	135	}
	136
	137	static inline struct ipc_namespace get_ipc_ns(struct ipc_namespace ns)
	138	{
	139	return ns;
	140	}
	141
	142	static inline void put_ipc_ns(struct ipc_namespace *ns)
	143	{
	144	}
	145	#endif
	146
	147	#ifdef CONFIG_POSIX_MQUEUE_SYSCTL
	148
	149	struct ctl_table_header;
	150	extern struct ctl_table_header *mq_register_sysctl_table(void);
	151
	152	#else /* CONFIG_POSIX_MQUEUE_SYSCTL */
	153
	154	static inline struct ctl_table_header *mq_register_sysctl_table(void)
	155	{
	156	return NULL;
	157	}
	158
	159	#endif /* CONFIG_POSIX_MQUEUE_SYSCTL */
	160	#endif