include/linux/ipc_namespace.h

   1 #ifndef __IPC_NAMESPACE_H__
   2 #define __IPC_NAMESPACE_H__
   3
   4 #include <linux/err.h>
   5 #include <linux/idr.h>
   6 #include <linux/rwsem.h>
   7 #include <linux/notifier.h>
   8 #include <linux/nsproxy.h>
   9
  10 /*
  11  * ipc namespace events
  12  */
  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 */
  16
  17 #define IPCNS_CALLBACK_PRI 0
  18
  19 struct user_namespace;
  20
  21 struct ipc_ids {
  22         int in_use;
  23         unsigned short seq;
  24         unsigned short seq_max;
  25         struct rw_semaphore rw_mutex;
  26         struct idr ipcs_idr;
  27 };
  28
  29 struct ipc_namespace {
  30         atomic_t        count;
  31         struct ipc_ids  ids[3];
  32
  33         int             sem_ctls[4];
  34         int             used_sems;
  35
  36         int             msg_ctlmax;
  37         int             msg_ctlmnb;
  38         int             msg_ctlmni;
  39         atomic_t        msg_bytes;
  40         atomic_t        msg_hdrs;
  41         int             auto_msgmni;
  42
  43         size_t          shm_ctlmax;
  44         size_t          shm_ctlall;
  45         int             shm_ctlmni;
  46         int             shm_tot;
  47
  48         struct notifier_block ipcns_nb;
  49
  50         /* The kern_mount of the mqueuefs sb.  We take a ref on it */
  51         struct vfsmount *mq_mnt;
  52
  53         /* # queues in this ns, protected by mq_lock */
  54         unsigned int    mq_queues_count;
  55
  56         /* next fields are set through sysctl */
  57         unsigned int    mq_queues_max;   /* initialized to DFLT_QUEUESMAX */
  58         unsigned int    mq_msg_max;      /* initialized to DFLT_MSGMAX */
  59         unsigned int    mq_msgsize_max;  /* initialized to DFLT_MSGSIZEMAX */
  60
  61         /* user_ns which owns the ipc ns */
  62         struct user_namespace *user_ns;
  63 };
  64
  65 extern struct ipc_namespace init_ipc_ns;
  66 extern atomic_t nr_ipc_ns;
  67
  68 extern spinlock_t mq_lock;
  69
  70 #ifdef CONFIG_SYSVIPC
  71 extern int register_ipcns_notifier(struct ipc_namespace *);
  72 extern int cond_register_ipcns_notifier(struct ipc_namespace *);
  73 extern void unregister_ipcns_notifier(struct ipc_namespace *);
  74 extern int ipcns_notify(unsigned long);
  75 #else /* CONFIG_SYSVIPC */
  76 static inline int register_ipcns_notifier(struct ipc_namespace *ns)
  77 { return 0; }
  78 static inline int cond_register_ipcns_notifier(struct ipc_namespace *ns)
  79 { return 0; }
  80 static inline void unregister_ipcns_notifier(struct ipc_namespace *ns) { }
  81 static inline int ipcns_notify(unsigned long l) { return 0; }
  82 #endif /* CONFIG_SYSVIPC */
  83
  84 #ifdef CONFIG_POSIX_MQUEUE
  85 extern int mq_init_ns(struct ipc_namespace *ns);
  86 /* default values */
  87 #define DFLT_QUEUESMAX 256     /* max number of message queues */
  88 #define DFLT_MSGMAX    10      /* max number of messages in each queue */
  89 #define HARD_MSGMAX    (32768*sizeof(void *)/4)
  90 #define DFLT_MSGSIZEMAX 8192   /* max message size */
  91 #else
  92 static inline int mq_init_ns(struct ipc_namespace *ns) { return 0; }
  93 #endif
  94
  95 #if defined(CONFIG_IPC_NS)
  96 extern struct ipc_namespace *copy_ipcs(unsigned long flags,
  97                                        struct task_struct *tsk);
  98 static inline struct ipc_namespace *get_ipc_ns(struct ipc_namespace *ns)
  99 {
 100         if (ns)
 101                 atomic_inc(&ns->count);
 102         return ns;
 103 }
 104
 105 extern void put_ipc_ns(struct ipc_namespace *ns);
 106 #else
 107 static inline struct ipc_namespace *copy_ipcs(unsigned long flags,
 108                                               struct task_struct *tsk)
 109 {
 110         if (flags & CLONE_NEWIPC)
 111                 return ERR_PTR(-EINVAL);
 112
 113         return tsk->nsproxy->ipc_ns;
 114 }
 115
 116 static inline struct ipc_namespace *get_ipc_ns(struct ipc_namespace *ns)
 117 {
 118         return ns;
 119 }
 120
 121 static inline void put_ipc_ns(struct ipc_namespace *ns)
 122 {
 123 }
 124 #endif
 125
 126 #ifdef CONFIG_POSIX_MQUEUE_SYSCTL
 127
 128 struct ctl_table_header;
 129 extern struct ctl_table_header *mq_register_sysctl_table(void);
 130
 131 #else /* CONFIG_POSIX_MQUEUE_SYSCTL */
 132
 133 static inline struct ctl_table_header *mq_register_sysctl_table(void)
 134 {
 135         return NULL;
 136 }
 137
 138 #endif /* CONFIG_POSIX_MQUEUE_SYSCTL */
 139 #endif