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 rw_mutex;
29 struct ipc_namespace {
31 struct ipc_ids ids[3];
48 * Defines whether IPC_RMID is forced for _all_ shm segments regardless
53 struct notifier_block ipcns_nb;
55 /* The kern_mount of the mqueuefs sb. We take a ref on it */
56 struct vfsmount *mq_mnt;
58 /* # queues in this ns, protected by mq_lock */
59 unsigned int mq_queues_count;
61 /* next fields are set through sysctl */
62 unsigned int mq_queues_max; /* initialized to DFLT_QUEUESMAX */
63 unsigned int mq_msg_max; /* initialized to DFLT_MSGMAX */
64 unsigned int mq_msgsize_max; /* initialized to DFLT_MSGSIZEMAX */
66 /* user_ns which owns the ipc ns */
67 struct user_namespace *user_ns;
70 extern struct ipc_namespace init_ipc_ns;
71 extern atomic_t nr_ipc_ns;
73 extern spinlock_t mq_lock;
76 extern int register_ipcns_notifier(struct ipc_namespace *);
77 extern int cond_register_ipcns_notifier(struct ipc_namespace *);
78 extern void unregister_ipcns_notifier(struct ipc_namespace *);
79 extern int ipcns_notify(unsigned long);
80 extern void shm_destroy_orphaned(struct ipc_namespace *ns);
81 #else /* CONFIG_SYSVIPC */
82 static inline int register_ipcns_notifier(struct ipc_namespace *ns)
84 static inline int cond_register_ipcns_notifier(struct ipc_namespace *ns)
86 static inline void unregister_ipcns_notifier(struct ipc_namespace *ns) { }
87 static inline int ipcns_notify(unsigned long l) { return 0; }
88 static inline void shm_destroy_orphaned(struct ipc_namespace *ns) {}
89 #endif /* CONFIG_SYSVIPC */
91 #ifdef CONFIG_POSIX_MQUEUE
92 extern int mq_init_ns(struct ipc_namespace *ns);
94 * POSIX Message Queue default values:
96 * MIN_*: Lowest value an admin can set the maximum unprivileged limit to
97 * DFLT_*MAX: Default values for the maximum unprivileged limits
98 * DFLT_{MSG,MSGSIZE}: Default values used when the user doesn't supply
99 * an attribute to the open call and the queue must be created
100 * HARD_*: Highest value the maximums can be set to. These are enforced
101 * on CAP_SYS_RESOURCE apps as well making them inviolate (so make them
104 * POSIX Requirements:
105 * Per app minimum openable message queues - 8. This does not map well
106 * to the fact that we limit the number of queues on a per namespace
107 * basis instead of a per app basis. So, make the default high enough
108 * that no given app should have a hard time opening 8 queues.
109 * Minimum maximum for HARD_MSGMAX - 32767. I bumped this to 65536.
110 * Minimum maximum for HARD_MSGSIZEMAX - POSIX is silent on this. However,
111 * we have run into a situation where running applications in the wild
112 * require this to be at least 5MB, and preferably 10MB, so I set the
113 * value to 16MB in hopes that this user is the worst of the bunch and
114 * the new maximum will handle anyone else. I may have to revisit this
117 #define MIN_QUEUESMAX 1
118 #define DFLT_QUEUESMAX 256
119 #define HARD_QUEUESMAX 1024
122 #define DFLT_MSGMAX 1024
123 #define HARD_MSGMAX 65536
124 #define MIN_MSGSIZEMAX 128
125 #define DFLT_MSGSIZE 8192U
126 #define DFLT_MSGSIZEMAX 1024*1024
127 #define HARD_MSGSIZEMAX 16*1024*1024
129 static inline int mq_init_ns(struct ipc_namespace *ns) { return 0; }
132 #if defined(CONFIG_IPC_NS)
133 extern struct ipc_namespace *copy_ipcs(unsigned long flags,
134 struct task_struct *tsk);
135 static inline struct ipc_namespace *get_ipc_ns(struct ipc_namespace *ns)
138 atomic_inc(&ns->count);
142 extern void put_ipc_ns(struct ipc_namespace *ns);
144 static inline struct ipc_namespace *copy_ipcs(unsigned long flags,
145 struct task_struct *tsk)
147 if (flags & CLONE_NEWIPC)
148 return ERR_PTR(-EINVAL);
150 return tsk->nsproxy->ipc_ns;
153 static inline struct ipc_namespace *get_ipc_ns(struct ipc_namespace *ns)
158 static inline void put_ipc_ns(struct ipc_namespace *ns)
163 #ifdef CONFIG_POSIX_MQUEUE_SYSCTL
165 struct ctl_table_header;
166 extern struct ctl_table_header *mq_register_sysctl_table(void);
168 #else /* CONFIG_POSIX_MQUEUE_SYSCTL */
170 static inline struct ctl_table_header *mq_register_sysctl_table(void)
175 #endif /* CONFIG_POSIX_MQUEUE_SYSCTL */