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>
10 struct user_namespace
;
15 struct rw_semaphore rwsem
;
20 struct ipc_namespace
{
22 struct ipc_ids ids
[3];
27 unsigned int msg_ctlmax
;
28 unsigned int msg_ctlmnb
;
29 unsigned int msg_ctlmni
;
35 unsigned long shm_tot
;
38 * Defines whether IPC_RMID is forced for _all_ shm segments regardless
43 struct notifier_block ipcns_nb
;
45 /* The kern_mount of the mqueuefs sb. We take a ref on it */
46 struct vfsmount
*mq_mnt
;
48 /* # queues in this ns, protected by mq_lock */
49 unsigned int mq_queues_count
;
51 /* next fields are set through sysctl */
52 unsigned int mq_queues_max
; /* initialized to DFLT_QUEUESMAX */
53 unsigned int mq_msg_max
; /* initialized to DFLT_MSGMAX */
54 unsigned int mq_msgsize_max
; /* initialized to DFLT_MSGSIZEMAX */
55 unsigned int mq_msg_default
;
56 unsigned int mq_msgsize_default
;
58 /* user_ns which owns the ipc ns */
59 struct user_namespace
*user_ns
;
61 unsigned int proc_inum
;
64 extern struct ipc_namespace init_ipc_ns
;
65 extern atomic_t nr_ipc_ns
;
67 extern spinlock_t mq_lock
;
70 extern void shm_destroy_orphaned(struct ipc_namespace
*ns
);
71 #else /* CONFIG_SYSVIPC */
72 static inline void shm_destroy_orphaned(struct ipc_namespace
*ns
) {}
73 #endif /* CONFIG_SYSVIPC */
75 #ifdef CONFIG_POSIX_MQUEUE
76 extern int mq_init_ns(struct ipc_namespace
*ns
);
78 * POSIX Message Queue default values:
80 * MIN_*: Lowest value an admin can set the maximum unprivileged limit to
81 * DFLT_*MAX: Default values for the maximum unprivileged limits
82 * DFLT_{MSG,MSGSIZE}: Default values used when the user doesn't supply
83 * an attribute to the open call and the queue must be created
84 * HARD_*: Highest value the maximums can be set to. These are enforced
85 * on CAP_SYS_RESOURCE apps as well making them inviolate (so make them
89 * Per app minimum openable message queues - 8. This does not map well
90 * to the fact that we limit the number of queues on a per namespace
91 * basis instead of a per app basis. So, make the default high enough
92 * that no given app should have a hard time opening 8 queues.
93 * Minimum maximum for HARD_MSGMAX - 32767. I bumped this to 65536.
94 * Minimum maximum for HARD_MSGSIZEMAX - POSIX is silent on this. However,
95 * we have run into a situation where running applications in the wild
96 * require this to be at least 5MB, and preferably 10MB, so I set the
97 * value to 16MB in hopes that this user is the worst of the bunch and
98 * the new maximum will handle anyone else. I may have to revisit this
101 #define DFLT_QUEUESMAX 256
104 #define DFLT_MSGMAX 10
105 #define HARD_MSGMAX 65536
106 #define MIN_MSGSIZEMAX 128
107 #define DFLT_MSGSIZE 8192U
108 #define DFLT_MSGSIZEMAX 8192
109 #define HARD_MSGSIZEMAX (16*1024*1024)
111 static inline int mq_init_ns(struct ipc_namespace
*ns
) { return 0; }
114 #if defined(CONFIG_IPC_NS)
115 extern struct ipc_namespace
*copy_ipcs(unsigned long flags
,
116 struct user_namespace
*user_ns
, struct ipc_namespace
*ns
);
118 static inline struct ipc_namespace
*get_ipc_ns(struct ipc_namespace
*ns
)
121 atomic_inc(&ns
->count
);
125 extern void put_ipc_ns(struct ipc_namespace
*ns
);
127 static inline struct ipc_namespace
*copy_ipcs(unsigned long flags
,
128 struct user_namespace
*user_ns
, struct ipc_namespace
*ns
)
130 if (flags
& CLONE_NEWIPC
)
131 return ERR_PTR(-EINVAL
);
136 static inline struct ipc_namespace
*get_ipc_ns(struct ipc_namespace
*ns
)
141 static inline void put_ipc_ns(struct ipc_namespace
*ns
)
146 #ifdef CONFIG_POSIX_MQUEUE_SYSCTL
148 struct ctl_table_header
;
149 extern struct ctl_table_header
*mq_register_sysctl_table(void);
151 #else /* CONFIG_POSIX_MQUEUE_SYSCTL */
153 static inline struct ctl_table_header
*mq_register_sysctl_table(void)
158 #endif /* CONFIG_POSIX_MQUEUE_SYSCTL */