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
19struct user_namespace;
20
21struct 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
29struct 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
70extern struct ipc_namespace init_ipc_ns;
71extern atomic_t nr_ipc_ns;
72
73extern spinlock_t mq_lock;
74
75#ifdef CONFIG_SYSVIPC
76extern int register_ipcns_notifier(struct ipc_namespace *);
77extern int cond_register_ipcns_notifier(struct ipc_namespace *);
78extern void unregister_ipcns_notifier(struct ipc_namespace *);
79extern int ipcns_notify(unsigned long);
80extern void shm_destroy_orphaned(struct ipc_namespace *ns);
81#else /* CONFIG_SYSVIPC */
82static inline int register_ipcns_notifier(struct ipc_namespace *ns)
83{ return 0; }
84static inline int cond_register_ipcns_notifier(struct ipc_namespace *ns)
85{ return 0; }
86static inline void unregister_ipcns_notifier(struct ipc_namespace *ns) { }
87static inline int ipcns_notify(unsigned long l) { return 0; }
88static inline void shm_destroy_orphaned(struct ipc_namespace *ns) {}
89#endif /* CONFIG_SYSVIPC */
90
91#ifdef CONFIG_POSIX_MQUEUE
92extern 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    (32768*sizeof(void *)/4)
97#define DFLT_MSGSIZEMAX 8192   /* max message size */
98#else
99static inline int mq_init_ns(struct ipc_namespace *ns) { return 0; }
100#endif
101
102#if defined(CONFIG_IPC_NS)
103extern struct ipc_namespace *copy_ipcs(unsigned long flags,
104				       struct task_struct *tsk);
105static 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
112extern void put_ipc_ns(struct ipc_namespace *ns);
113#else
114static 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
123static inline struct ipc_namespace *get_ipc_ns(struct ipc_namespace *ns)
124{
125	return ns;
126}
127
128static inline void put_ipc_ns(struct ipc_namespace *ns)
129{
130}
131#endif
132
133#ifdef CONFIG_POSIX_MQUEUE_SYSCTL
134
135struct ctl_table_header;
136extern struct ctl_table_header *mq_register_sysctl_table(void);
137
138#else /* CONFIG_POSIX_MQUEUE_SYSCTL */
139
140static inline struct ctl_table_header *mq_register_sysctl_table(void)
141{
142	return NULL;
143}
144
145#endif /* CONFIG_POSIX_MQUEUE_SYSCTL */
146#endif
147