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 spinlock_t mq_lock;
69 extern void shm_destroy_orphaned(struct ipc_namespace *ns);
70 #else /* CONFIG_SYSVIPC */
71 static inline void shm_destroy_orphaned(struct ipc_namespace *ns) {}
72 #endif /* CONFIG_SYSVIPC */
74 #ifdef CONFIG_POSIX_MQUEUE
75 extern int mq_init_ns(struct ipc_namespace *ns);
77 * POSIX Message Queue default values:
79 * MIN_*: Lowest value an admin can set the maximum unprivileged limit to
80 * DFLT_*MAX: Default values for the maximum unprivileged limits
81 * DFLT_{MSG,MSGSIZE}: Default values used when the user doesn't supply
82 * an attribute to the open call and the queue must be created
83 * HARD_*: Highest value the maximums can be set to. These are enforced
84 * on CAP_SYS_RESOURCE apps as well making them inviolate (so make them
88 * Per app minimum openable message queues - 8. This does not map well
89 * to the fact that we limit the number of queues on a per namespace
90 * basis instead of a per app basis. So, make the default high enough
91 * that no given app should have a hard time opening 8 queues.
92 * Minimum maximum for HARD_MSGMAX - 32767. I bumped this to 65536.
93 * Minimum maximum for HARD_MSGSIZEMAX - POSIX is silent on this. However,
94 * we have run into a situation where running applications in the wild
95 * require this to be at least 5MB, and preferably 10MB, so I set the
96 * value to 16MB in hopes that this user is the worst of the bunch and
97 * the new maximum will handle anyone else. I may have to revisit this
100 #define DFLT_QUEUESMAX 256
103 #define DFLT_MSGMAX 10
104 #define HARD_MSGMAX 65536
105 #define MIN_MSGSIZEMAX 128
106 #define DFLT_MSGSIZE 8192U
107 #define DFLT_MSGSIZEMAX 8192
108 #define HARD_MSGSIZEMAX (16*1024*1024)
110 static inline int mq_init_ns(struct ipc_namespace *ns) { return 0; }
113 #if defined(CONFIG_IPC_NS)
114 extern struct ipc_namespace *copy_ipcs(unsigned long flags,
115 struct user_namespace *user_ns, struct ipc_namespace *ns);
117 static inline struct ipc_namespace *get_ipc_ns(struct ipc_namespace *ns)
120 atomic_inc(&ns->count);
124 extern void put_ipc_ns(struct ipc_namespace *ns);
126 static inline struct ipc_namespace *copy_ipcs(unsigned long flags,
127 struct user_namespace *user_ns, struct ipc_namespace *ns)
129 if (flags & CLONE_NEWIPC)
130 return ERR_PTR(-EINVAL);
135 static inline struct ipc_namespace *get_ipc_ns(struct ipc_namespace *ns)
140 static inline void put_ipc_ns(struct ipc_namespace *ns)
145 #ifdef CONFIG_POSIX_MQUEUE_SYSCTL
147 struct ctl_table_header;
148 extern struct ctl_table_header *mq_register_sysctl_table(void);
150 #else /* CONFIG_POSIX_MQUEUE_SYSCTL */
152 static inline struct ctl_table_header *mq_register_sysctl_table(void)
157 #endif /* CONFIG_POSIX_MQUEUE_SYSCTL */