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 62 struct ns_common ns; 63 }; 64 65 extern struct ipc_namespace init_ipc_ns; 66 extern spinlock_t mq_lock; 67 68 #ifdef CONFIG_SYSVIPC 69 extern void shm_destroy_orphaned(struct ipc_namespace *ns); 70 #else /* CONFIG_SYSVIPC */ 71 static inline void shm_destroy_orphaned(struct ipc_namespace *ns) {} 72 #endif /* CONFIG_SYSVIPC */ 73 74 #ifdef CONFIG_POSIX_MQUEUE 75 extern int mq_init_ns(struct ipc_namespace *ns); 76 /* 77 * POSIX Message Queue default values: 78 * 79 * MIN_*: Lowest value an admin can set the maximum unprivileged limit to 80 * DFLT_*MAX: Default values for the maximum unprivileged limits 81 * DFLT_{MSG,MSGSIZE}: Default values used when the user doesn't supply 82 * an attribute to the open call and the queue must be created 83 * HARD_*: Highest value the maximums can be set to. These are enforced 84 * on CAP_SYS_RESOURCE apps as well making them inviolate (so make them 85 * suitably high) 86 * 87 * POSIX Requirements: 88 * Per app minimum openable message queues - 8. This does not map well 89 * to the fact that we limit the number of queues on a per namespace 90 * basis instead of a per app basis. So, make the default high enough 91 * that no given app should have a hard time opening 8 queues. 92 * Minimum maximum for HARD_MSGMAX - 32767. I bumped this to 65536. 93 * Minimum maximum for HARD_MSGSIZEMAX - POSIX is silent on this. However, 94 * we have run into a situation where running applications in the wild 95 * require this to be at least 5MB, and preferably 10MB, so I set the 96 * value to 16MB in hopes that this user is the worst of the bunch and 97 * the new maximum will handle anyone else. I may have to revisit this 98 * in the future. 99 */ 100 #define DFLT_QUEUESMAX 256 101 #define MIN_MSGMAX 1 102 #define DFLT_MSG 10U 103 #define DFLT_MSGMAX 10 104 #define HARD_MSGMAX 65536 105 #define MIN_MSGSIZEMAX 128 106 #define DFLT_MSGSIZE 8192U 107 #define DFLT_MSGSIZEMAX 8192 108 #define HARD_MSGSIZEMAX (16*1024*1024) 109 #else 110 static inline int mq_init_ns(struct ipc_namespace *ns) { return 0; } 111 #endif 112 113 #if defined(CONFIG_IPC_NS) 114 extern struct ipc_namespace *copy_ipcs(unsigned long flags, 115 struct user_namespace *user_ns, struct ipc_namespace *ns); 116 117 static inline struct ipc_namespace *get_ipc_ns(struct ipc_namespace *ns) 118 { 119 if (ns) 120 atomic_inc(&ns->count); 121 return ns; 122 } 123 124 extern void put_ipc_ns(struct ipc_namespace *ns); 125 #else 126 static inline struct ipc_namespace *copy_ipcs(unsigned long flags, 127 struct user_namespace *user_ns, struct ipc_namespace *ns) 128 { 129 if (flags & CLONE_NEWIPC) 130 return ERR_PTR(-EINVAL); 131 132 return ns; 133 } 134 135 static inline struct ipc_namespace *get_ipc_ns(struct ipc_namespace *ns) 136 { 137 return ns; 138 } 139 140 static inline void put_ipc_ns(struct ipc_namespace *ns) 141 { 142 } 143 #endif 144 145 #ifdef CONFIG_POSIX_MQUEUE_SYSCTL 146 147 struct ctl_table_header; 148 extern struct ctl_table_header *mq_register_sysctl_table(void); 149 150 #else /* CONFIG_POSIX_MQUEUE_SYSCTL */ 151 152 static inline struct ctl_table_header *mq_register_sysctl_table(void) 153 { 154 return NULL; 155 } 156 157 #endif /* CONFIG_POSIX_MQUEUE_SYSCTL */ 158 #endif 159