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 struct rw_semaphore rwsem;
29 struct ipc_namespace {
31 struct ipc_ids ids[3];
36 unsigned int msg_ctlmax;
37 unsigned int msg_ctlmnb;
38 unsigned int msg_ctlmni;
45 unsigned long shm_tot;
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 */
65 unsigned int mq_msg_default;
66 unsigned int mq_msgsize_default;
68 /* user_ns which owns the ipc ns */
69 struct user_namespace *user_ns;
71 unsigned int proc_inum;
74 extern struct ipc_namespace init_ipc_ns;
75 extern atomic_t nr_ipc_ns;
77 extern spinlock_t mq_lock;
80 extern int register_ipcns_notifier(struct ipc_namespace *);
81 extern int cond_register_ipcns_notifier(struct ipc_namespace *);
82 extern void unregister_ipcns_notifier(struct ipc_namespace *);
83 extern int ipcns_notify(unsigned long);
84 extern void shm_destroy_orphaned(struct ipc_namespace *ns);
85 #else /* CONFIG_SYSVIPC */
86 static inline int register_ipcns_notifier(struct ipc_namespace *ns)
88 static inline int cond_register_ipcns_notifier(struct ipc_namespace *ns)
90 static inline void unregister_ipcns_notifier(struct ipc_namespace *ns) { }
91 static inline int ipcns_notify(unsigned long l) { return 0; }
92 static inline void shm_destroy_orphaned(struct ipc_namespace *ns) {}
93 #endif /* CONFIG_SYSVIPC */
95 #ifdef CONFIG_POSIX_MQUEUE
96 extern int mq_init_ns(struct ipc_namespace *ns);
98 * POSIX Message Queue default values:
100 * MIN_*: Lowest value an admin can set the maximum unprivileged limit to
101 * DFLT_*MAX: Default values for the maximum unprivileged limits
102 * DFLT_{MSG,MSGSIZE}: Default values used when the user doesn't supply
103 * an attribute to the open call and the queue must be created
104 * HARD_*: Highest value the maximums can be set to. These are enforced
105 * on CAP_SYS_RESOURCE apps as well making them inviolate (so make them
108 * POSIX Requirements:
109 * Per app minimum openable message queues - 8. This does not map well
110 * to the fact that we limit the number of queues on a per namespace
111 * basis instead of a per app basis. So, make the default high enough
112 * that no given app should have a hard time opening 8 queues.
113 * Minimum maximum for HARD_MSGMAX - 32767. I bumped this to 65536.
114 * Minimum maximum for HARD_MSGSIZEMAX - POSIX is silent on this. However,
115 * we have run into a situation where running applications in the wild
116 * require this to be at least 5MB, and preferably 10MB, so I set the
117 * value to 16MB in hopes that this user is the worst of the bunch and
118 * the new maximum will handle anyone else. I may have to revisit this
121 #define DFLT_QUEUESMAX 256
124 #define DFLT_MSGMAX 10
125 #define HARD_MSGMAX 65536
126 #define MIN_MSGSIZEMAX 128
127 #define DFLT_MSGSIZE 8192U
128 #define DFLT_MSGSIZEMAX 8192
129 #define HARD_MSGSIZEMAX (16*1024*1024)
131 static inline int mq_init_ns(struct ipc_namespace *ns) { return 0; }
134 #if defined(CONFIG_IPC_NS)
135 extern struct ipc_namespace *copy_ipcs(unsigned long flags,
136 struct user_namespace *user_ns, struct ipc_namespace *ns);
138 static inline struct ipc_namespace *get_ipc_ns(struct ipc_namespace *ns)
141 atomic_inc(&ns->count);
145 extern void put_ipc_ns(struct ipc_namespace *ns);
147 static inline struct ipc_namespace *copy_ipcs(unsigned long flags,
148 struct user_namespace *user_ns, struct ipc_namespace *ns)
150 if (flags & CLONE_NEWIPC)
151 return ERR_PTR(-EINVAL);
156 static inline struct ipc_namespace *get_ipc_ns(struct ipc_namespace *ns)
161 static inline void put_ipc_ns(struct ipc_namespace *ns)
166 #ifdef CONFIG_POSIX_MQUEUE_SYSCTL
168 struct ctl_table_header;
169 extern struct ctl_table_header *mq_register_sysctl_table(void);
171 #else /* CONFIG_POSIX_MQUEUE_SYSCTL */
173 static inline struct ctl_table_header *mq_register_sysctl_table(void)
178 #endif /* CONFIG_POSIX_MQUEUE_SYSCTL */