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;
61 struct ucounts *ucounts;
66 extern struct ipc_namespace init_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 static inline struct ipc_namespace *get_ipc_ns_not_zero(struct ipc_namespace *ns)
128 if (atomic_inc_not_zero(&ns->count))
135 extern void put_ipc_ns(struct ipc_namespace *ns);
137 static inline struct ipc_namespace *copy_ipcs(unsigned long flags,
138 struct user_namespace *user_ns, struct ipc_namespace *ns)
140 if (flags & CLONE_NEWIPC)
141 return ERR_PTR(-EINVAL);
146 static inline struct ipc_namespace *get_ipc_ns(struct ipc_namespace *ns)
151 static inline struct ipc_namespace *get_ipc_ns_not_zero(struct ipc_namespace *ns)
156 static inline void put_ipc_ns(struct ipc_namespace *ns)
161 #ifdef CONFIG_POSIX_MQUEUE_SYSCTL
163 struct ctl_table_header;
164 extern struct ctl_table_header *mq_register_sysctl_table(void);
166 #else /* CONFIG_POSIX_MQUEUE_SYSCTL */
168 static inline struct ctl_table_header *mq_register_sysctl_table(void)
173 #endif /* CONFIG_POSIX_MQUEUE_SYSCTL */