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>
9 #include <linux/ns_common.h>
11 struct user_namespace
;
16 struct rw_semaphore rwsem
;
21 struct ipc_namespace
{
23 struct ipc_ids ids
[3];
28 unsigned int msg_ctlmax
;
29 unsigned int msg_ctlmnb
;
30 unsigned int msg_ctlmni
;
36 unsigned long shm_tot
;
39 * Defines whether IPC_RMID is forced for _all_ shm segments regardless
44 struct notifier_block ipcns_nb
;
46 /* The kern_mount of the mqueuefs sb. We take a ref on it */
47 struct vfsmount
*mq_mnt
;
49 /* # queues in this ns, protected by mq_lock */
50 unsigned int mq_queues_count
;
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
;
59 /* user_ns which owns the ipc ns */
60 struct user_namespace
*user_ns
;
65 extern struct ipc_namespace init_ipc_ns
;
66 extern atomic_t nr_ipc_ns
;
68 extern spinlock_t mq_lock
;
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 */
76 #ifdef CONFIG_POSIX_MQUEUE
77 extern int mq_init_ns(struct ipc_namespace
*ns
);
79 * POSIX Message Queue default values:
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
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
102 #define DFLT_QUEUESMAX 256
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 (16*1024*1024)
112 static inline int mq_init_ns(struct ipc_namespace
*ns
) { return 0; }
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
);
119 static inline struct ipc_namespace
*get_ipc_ns(struct ipc_namespace
*ns
)
122 atomic_inc(&ns
->count
);
126 extern void put_ipc_ns(struct ipc_namespace
*ns
);
128 static inline struct ipc_namespace
*copy_ipcs(unsigned long flags
,
129 struct user_namespace
*user_ns
, struct ipc_namespace
*ns
)
131 if (flags
& CLONE_NEWIPC
)
132 return ERR_PTR(-EINVAL
);
137 static inline struct ipc_namespace
*get_ipc_ns(struct ipc_namespace
*ns
)
142 static inline void put_ipc_ns(struct ipc_namespace
*ns
)
147 #ifdef CONFIG_POSIX_MQUEUE_SYSCTL
149 struct ctl_table_header
;
150 extern struct ctl_table_header
*mq_register_sysctl_table(void);
152 #else /* CONFIG_POSIX_MQUEUE_SYSCTL */
154 static inline struct ctl_table_header
*mq_register_sysctl_table(void)
159 #endif /* CONFIG_POSIX_MQUEUE_SYSCTL */