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 #include <linux/ns_common.h> 10 11 /* 12 * ipc namespace events 13 */ 14 #define IPCNS_MEMCHANGED 0x00000001 /* Notify lowmem size changed */ 15 #define IPCNS_CREATED 0x00000002 /* Notify new ipc namespace created */ 16 #define IPCNS_REMOVED 0x00000003 /* Notify ipc namespace removed */ 17 18 #define IPCNS_CALLBACK_PRI 0 19 20 struct user_namespace; 21 22 struct ipc_ids { 23 int in_use; 24 unsigned short seq; 25 struct rw_semaphore rwsem; 26 struct idr ipcs_idr; 27 int next_id; 28 }; 29 30 struct ipc_namespace { 31 atomic_t count; 32 struct ipc_ids ids[3]; 33 34 int sem_ctls[4]; 35 int used_sems; 36 37 unsigned int msg_ctlmax; 38 unsigned int msg_ctlmnb; 39 unsigned int msg_ctlmni; 40 atomic_t msg_bytes; 41 atomic_t msg_hdrs; 42 int auto_msgmni; 43 44 size_t shm_ctlmax; 45 size_t shm_ctlall; 46 unsigned long shm_tot; 47 int shm_ctlmni; 48 /* 49 * Defines whether IPC_RMID is forced for _all_ shm segments regardless 50 * of shmctl() 51 */ 52 int shm_rmid_forced; 53 54 struct notifier_block ipcns_nb; 55 56 /* The kern_mount of the mqueuefs sb. We take a ref on it */ 57 struct vfsmount *mq_mnt; 58 59 /* # queues in this ns, protected by mq_lock */ 60 unsigned int mq_queues_count; 61 62 /* next fields are set through sysctl */ 63 unsigned int mq_queues_max; /* initialized to DFLT_QUEUESMAX */ 64 unsigned int mq_msg_max; /* initialized to DFLT_MSGMAX */ 65 unsigned int mq_msgsize_max; /* initialized to DFLT_MSGSIZEMAX */ 66 unsigned int mq_msg_default; 67 unsigned int mq_msgsize_default; 68 69 /* user_ns which owns the ipc ns */ 70 struct user_namespace *user_ns; 71 72 struct ns_common ns; 73 }; 74 75 extern struct ipc_namespace init_ipc_ns; 76 extern atomic_t nr_ipc_ns; 77 78 extern spinlock_t mq_lock; 79 80 #ifdef CONFIG_SYSVIPC 81 extern int register_ipcns_notifier(struct ipc_namespace *); 82 extern int cond_register_ipcns_notifier(struct ipc_namespace *); 83 extern void unregister_ipcns_notifier(struct ipc_namespace *); 84 extern int ipcns_notify(unsigned long); 85 extern void shm_destroy_orphaned(struct ipc_namespace *ns); 86 #else /* CONFIG_SYSVIPC */ 87 static inline int register_ipcns_notifier(struct ipc_namespace *ns) 88 { return 0; } 89 static inline int cond_register_ipcns_notifier(struct ipc_namespace *ns) 90 { return 0; } 91 static inline void unregister_ipcns_notifier(struct ipc_namespace *ns) { } 92 static inline int ipcns_notify(unsigned long l) { return 0; } 93 static inline void shm_destroy_orphaned(struct ipc_namespace *ns) {} 94 #endif /* CONFIG_SYSVIPC */ 95 96 #ifdef CONFIG_POSIX_MQUEUE 97 extern int mq_init_ns(struct ipc_namespace *ns); 98 /* 99 * POSIX Message Queue default values: 100 * 101 * MIN_*: Lowest value an admin can set the maximum unprivileged limit to 102 * DFLT_*MAX: Default values for the maximum unprivileged limits 103 * DFLT_{MSG,MSGSIZE}: Default values used when the user doesn't supply 104 * an attribute to the open call and the queue must be created 105 * HARD_*: Highest value the maximums can be set to. These are enforced 106 * on CAP_SYS_RESOURCE apps as well making them inviolate (so make them 107 * suitably high) 108 * 109 * POSIX Requirements: 110 * Per app minimum openable message queues - 8. This does not map well 111 * to the fact that we limit the number of queues on a per namespace 112 * basis instead of a per app basis. So, make the default high enough 113 * that no given app should have a hard time opening 8 queues. 114 * Minimum maximum for HARD_MSGMAX - 32767. I bumped this to 65536. 115 * Minimum maximum for HARD_MSGSIZEMAX - POSIX is silent on this. However, 116 * we have run into a situation where running applications in the wild 117 * require this to be at least 5MB, and preferably 10MB, so I set the 118 * value to 16MB in hopes that this user is the worst of the bunch and 119 * the new maximum will handle anyone else. I may have to revisit this 120 * in the future. 121 */ 122 #define DFLT_QUEUESMAX 256 123 #define MIN_MSGMAX 1 124 #define DFLT_MSG 10U 125 #define DFLT_MSGMAX 10 126 #define HARD_MSGMAX 65536 127 #define MIN_MSGSIZEMAX 128 128 #define DFLT_MSGSIZE 8192U 129 #define DFLT_MSGSIZEMAX 8192 130 #define HARD_MSGSIZEMAX (16*1024*1024) 131 #else 132 static inline int mq_init_ns(struct ipc_namespace *ns) { return 0; } 133 #endif 134 135 #if defined(CONFIG_IPC_NS) 136 extern struct ipc_namespace *copy_ipcs(unsigned long flags, 137 struct user_namespace *user_ns, struct ipc_namespace *ns); 138 139 static inline struct ipc_namespace *get_ipc_ns(struct ipc_namespace *ns) 140 { 141 if (ns) 142 atomic_inc(&ns->count); 143 return ns; 144 } 145 146 extern void put_ipc_ns(struct ipc_namespace *ns); 147 #else 148 static inline struct ipc_namespace *copy_ipcs(unsigned long flags, 149 struct user_namespace *user_ns, struct ipc_namespace *ns) 150 { 151 if (flags & CLONE_NEWIPC) 152 return ERR_PTR(-EINVAL); 153 154 return ns; 155 } 156 157 static inline struct ipc_namespace *get_ipc_ns(struct ipc_namespace *ns) 158 { 159 return ns; 160 } 161 162 static inline void put_ipc_ns(struct ipc_namespace *ns) 163 { 164 } 165 #endif 166 167 #ifdef CONFIG_POSIX_MQUEUE_SYSCTL 168 169 struct ctl_table_header; 170 extern struct ctl_table_header *mq_register_sysctl_table(void); 171 172 #else /* CONFIG_POSIX_MQUEUE_SYSCTL */ 173 174 static inline struct ctl_table_header *mq_register_sysctl_table(void) 175 { 176 return NULL; 177 } 178 179 #endif /* CONFIG_POSIX_MQUEUE_SYSCTL */ 180 #endif 181