1 #ifndef __IPC_NAMESPACE_H__
2 #define __IPC_NAMESPACE_H__
6 #include <linux/rwsem.h>
7 #include <linux/notifier.h>
8 #include <linux/nsproxy.h>
11 * ipc namespace events
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 */
17 #define IPCNS_CALLBACK_PRI 0
19 struct user_namespace
;
24 unsigned short seq_max
;
25 struct rw_semaphore rwsem
;
30 struct ipc_namespace
{
32 struct ipc_ids ids
[3];
37 unsigned int msg_ctlmax
;
38 unsigned int msg_ctlmnb
;
39 unsigned int msg_ctlmni
;
46 unsigned long shm_tot
;
49 * Defines whether IPC_RMID is forced for _all_ shm segments regardless
54 struct notifier_block ipcns_nb
;
56 /* The kern_mount of the mqueuefs sb. We take a ref on it */
57 struct vfsmount
*mq_mnt
;
59 /* # queues in this ns, protected by mq_lock */
60 unsigned int mq_queues_count
;
62 /* next fields are set through sysctl */
63 unsigned int mq_queues_max
; /* initialized to DFLT_QUEUESMAX */
64 unsigned int mq_msg_max
; /* initialized to DFLT_MSGMAX */
65 unsigned int mq_msgsize_max
; /* initialized to DFLT_MSGSIZEMAX */
66 unsigned int mq_msg_default
;
67 unsigned int mq_msgsize_default
;
69 /* user_ns which owns the ipc ns */
70 struct user_namespace
*user_ns
;
72 unsigned int proc_inum
;
75 extern struct ipc_namespace init_ipc_ns
;
76 extern atomic_t nr_ipc_ns
;
78 extern spinlock_t mq_lock
;
81 extern int register_ipcns_notifier(struct ipc_namespace
*);
82 extern int cond_register_ipcns_notifier(struct ipc_namespace
*);
83 extern void unregister_ipcns_notifier(struct ipc_namespace
*);
84 extern int ipcns_notify(unsigned long);
85 extern void shm_destroy_orphaned(struct ipc_namespace
*ns
);
86 #else /* CONFIG_SYSVIPC */
87 static inline int register_ipcns_notifier(struct ipc_namespace
*ns
)
89 static inline int cond_register_ipcns_notifier(struct ipc_namespace
*ns
)
91 static inline void unregister_ipcns_notifier(struct ipc_namespace
*ns
) { }
92 static inline int ipcns_notify(unsigned long l
) { return 0; }
93 static inline void shm_destroy_orphaned(struct ipc_namespace
*ns
) {}
94 #endif /* CONFIG_SYSVIPC */
96 #ifdef CONFIG_POSIX_MQUEUE
97 extern int mq_init_ns(struct ipc_namespace
*ns
);
99 * POSIX Message Queue default values:
101 * MIN_*: Lowest value an admin can set the maximum unprivileged limit to
102 * DFLT_*MAX: Default values for the maximum unprivileged limits
103 * DFLT_{MSG,MSGSIZE}: Default values used when the user doesn't supply
104 * an attribute to the open call and the queue must be created
105 * HARD_*: Highest value the maximums can be set to. These are enforced
106 * on CAP_SYS_RESOURCE apps as well making them inviolate (so make them
109 * POSIX Requirements:
110 * Per app minimum openable message queues - 8. This does not map well
111 * to the fact that we limit the number of queues on a per namespace
112 * basis instead of a per app basis. So, make the default high enough
113 * that no given app should have a hard time opening 8 queues.
114 * Minimum maximum for HARD_MSGMAX - 32767. I bumped this to 65536.
115 * Minimum maximum for HARD_MSGSIZEMAX - POSIX is silent on this. However,
116 * we have run into a situation where running applications in the wild
117 * require this to be at least 5MB, and preferably 10MB, so I set the
118 * value to 16MB in hopes that this user is the worst of the bunch and
119 * the new maximum will handle anyone else. I may have to revisit this
122 #define MIN_QUEUESMAX 1
123 #define DFLT_QUEUESMAX 256
124 #define HARD_QUEUESMAX 1024
127 #define DFLT_MSGMAX 10
128 #define HARD_MSGMAX 65536
129 #define MIN_MSGSIZEMAX 128
130 #define DFLT_MSGSIZE 8192U
131 #define DFLT_MSGSIZEMAX 8192
132 #define HARD_MSGSIZEMAX (16*1024*1024)
134 static inline int mq_init_ns(struct ipc_namespace
*ns
) { return 0; }
137 #if defined(CONFIG_IPC_NS)
138 extern struct ipc_namespace
*copy_ipcs(unsigned long flags
,
139 struct user_namespace
*user_ns
, struct ipc_namespace
*ns
);
141 static inline struct ipc_namespace
*get_ipc_ns(struct ipc_namespace
*ns
)
144 atomic_inc(&ns
->count
);
148 extern void put_ipc_ns(struct ipc_namespace
*ns
);
150 static inline struct ipc_namespace
*copy_ipcs(unsigned long flags
,
151 struct user_namespace
*user_ns
, struct ipc_namespace
*ns
)
153 if (flags
& CLONE_NEWIPC
)
154 return ERR_PTR(-EINVAL
);
159 static inline struct ipc_namespace
*get_ipc_ns(struct ipc_namespace
*ns
)
164 static inline void put_ipc_ns(struct ipc_namespace
*ns
)
169 #ifdef CONFIG_POSIX_MQUEUE_SYSCTL
171 struct ctl_table_header
;
172 extern struct ctl_table_header
*mq_register_sysctl_table(void);
174 #else /* CONFIG_POSIX_MQUEUE_SYSCTL */
176 static inline struct ctl_table_header
*mq_register_sysctl_table(void)
181 #endif /* CONFIG_POSIX_MQUEUE_SYSCTL */