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 147