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