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          * Defines whether IPC_RMID is forced for _all_ shm segments regardless
  49          * of shmctl()
  50          */
  51         int             shm_rmid_forced;
  52
  53         struct notifier_block ipcns_nb;
  54
  55         /* The kern_mount of the mqueuefs sb.  We take a ref on it */
  56         struct vfsmount *mq_mnt;
  57
  58         /* # queues in this ns, protected by mq_lock */
  59         unsigned int    mq_queues_count;
  60
  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
  66         /* user_ns which owns the ipc ns */
  67         struct user_namespace *user_ns;
  68 };
  69
  70 extern struct ipc_namespace init_ipc_ns;
  71 extern atomic_t nr_ipc_ns;
  72
  73 extern spinlock_t mq_lock;
  74
  75 #ifdef CONFIG_SYSVIPC
  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)
  83 { return 0; }
  84 static inline int cond_register_ipcns_notifier(struct ipc_namespace *ns)
  85 { return 0; }
  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 */
  90
  91 #ifdef CONFIG_POSIX_MQUEUE
  92 extern int mq_init_ns(struct ipc_namespace *ns);
  93 /* default values */
  94 #define DFLT_QUEUESMAX 256     /* max number of message queues */
  95 #define DFLT_MSGMAX    10      /* max number of messages in each queue */
  96 #define HARD_MSGMAX    (32768*sizeof(void *)/4)
  97 #define DFLT_MSGSIZEMAX 8192   /* max message size */
  98 #else
  99 static inline int mq_init_ns(struct ipc_namespace *ns) { return 0; }
 100 #endif
 101
 102 #if defined(CONFIG_IPC_NS)
 103 extern struct ipc_namespace *copy_ipcs(unsigned long flags,
 104                                        struct task_struct *tsk);
 105 static inline struct ipc_namespace *get_ipc_ns(struct ipc_namespace *ns)
 106 {
 107         if (ns)
 108                 atomic_inc(&ns->count);
 109         return ns;
 110 }
 111
 112 extern void put_ipc_ns(struct ipc_namespace *ns);
 113 #else
 114 static inline struct ipc_namespace *copy_ipcs(unsigned long flags,
 115                                               struct task_struct *tsk)
 116 {
 117         if (flags & CLONE_NEWIPC)
 118                 return ERR_PTR(-EINVAL);
 119
 120         return tsk->nsproxy->ipc_ns;
 121 }
 122
 123 static inline struct ipc_namespace *get_ipc_ns(struct ipc_namespace *ns)
 124 {
 125         return ns;
 126 }
 127
 128 static inline void put_ipc_ns(struct ipc_namespace *ns)
 129 {
 130 }
 131 #endif
 132
 133 #ifdef CONFIG_POSIX_MQUEUE_SYSCTL
 134
 135 struct ctl_table_header;
 136 extern struct ctl_table_header *mq_register_sysctl_table(void);
 137
 138 #else /* CONFIG_POSIX_MQUEUE_SYSCTL */
 139
 140 static inline struct ctl_table_header *mq_register_sysctl_table(void)
 141 {
 142         return NULL;
 143 }
 144
 145 #endif /* CONFIG_POSIX_MQUEUE_SYSCTL */
 146 #endif