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 	struct notifier_block ipcns_nb;
49 
50 	/* The kern_mount of the mqueuefs sb.  We take a ref on it */
51 	struct vfsmount	*mq_mnt;
52 
53 	/* # queues in this ns, protected by mq_lock */
54 	unsigned int    mq_queues_count;
55 
56 	/* next fields are set through sysctl */
57 	unsigned int    mq_queues_max;   /* initialized to DFLT_QUEUESMAX */
58 	unsigned int    mq_msg_max;      /* initialized to DFLT_MSGMAX */
59 	unsigned int    mq_msgsize_max;  /* initialized to DFLT_MSGSIZEMAX */
60 
61 	/* user_ns which owns the ipc ns */
62 	struct user_namespace *user_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 int register_ipcns_notifier(struct ipc_namespace *);
72 extern int cond_register_ipcns_notifier(struct ipc_namespace *);
73 extern void unregister_ipcns_notifier(struct ipc_namespace *);
74 extern int ipcns_notify(unsigned long);
75 #else /* CONFIG_SYSVIPC */
register_ipcns_notifier(struct ipc_namespace * ns)76 static inline int register_ipcns_notifier(struct ipc_namespace *ns)
77 { return 0; }
cond_register_ipcns_notifier(struct ipc_namespace * ns)78 static inline int cond_register_ipcns_notifier(struct ipc_namespace *ns)
79 { return 0; }
unregister_ipcns_notifier(struct ipc_namespace * ns)80 static inline void unregister_ipcns_notifier(struct ipc_namespace *ns) { }
ipcns_notify(unsigned long l)81 static inline int ipcns_notify(unsigned long l) { return 0; }
82 #endif /* CONFIG_SYSVIPC */
83 
84 #ifdef CONFIG_POSIX_MQUEUE
85 extern int mq_init_ns(struct ipc_namespace *ns);
86 /* default values */
87 #define DFLT_QUEUESMAX 256     /* max number of message queues */
88 #define DFLT_MSGMAX    10      /* max number of messages in each queue */
89 #define HARD_MSGMAX    (32768*sizeof(void *)/4)
90 #define DFLT_MSGSIZEMAX 8192   /* max message size */
91 #else
mq_init_ns(struct ipc_namespace * ns)92 static inline int mq_init_ns(struct ipc_namespace *ns) { return 0; }
93 #endif
94 
95 #if defined(CONFIG_IPC_NS)
96 extern struct ipc_namespace *copy_ipcs(unsigned long flags,
97 				       struct task_struct *tsk);
get_ipc_ns(struct ipc_namespace * ns)98 static inline struct ipc_namespace *get_ipc_ns(struct ipc_namespace *ns)
99 {
100 	if (ns)
101 		atomic_inc(&ns->count);
102 	return ns;
103 }
104 
105 extern void put_ipc_ns(struct ipc_namespace *ns);
106 #else
copy_ipcs(unsigned long flags,struct task_struct * tsk)107 static inline struct ipc_namespace *copy_ipcs(unsigned long flags,
108 					      struct task_struct *tsk)
109 {
110 	if (flags & CLONE_NEWIPC)
111 		return ERR_PTR(-EINVAL);
112 
113 	return tsk->nsproxy->ipc_ns;
114 }
115 
get_ipc_ns(struct ipc_namespace * ns)116 static inline struct ipc_namespace *get_ipc_ns(struct ipc_namespace *ns)
117 {
118 	return ns;
119 }
120 
put_ipc_ns(struct ipc_namespace * ns)121 static inline void put_ipc_ns(struct ipc_namespace *ns)
122 {
123 }
124 #endif
125 
126 #ifdef CONFIG_POSIX_MQUEUE_SYSCTL
127 
128 struct ctl_table_header;
129 extern struct ctl_table_header *mq_register_sysctl_table(void);
130 
131 #else /* CONFIG_POSIX_MQUEUE_SYSCTL */
132 
mq_register_sysctl_table(void)133 static inline struct ctl_table_header *mq_register_sysctl_table(void)
134 {
135 	return NULL;
136 }
137 
138 #endif /* CONFIG_POSIX_MQUEUE_SYSCTL */
139 #endif
140