| 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 atomic_t nr_ipc_ns; |
| 67 | |
| 68 | extern spinlock_t mq_lock; |
| 69 | |
| 70 | #ifdef CONFIG_SYSVIPC |
| 71 | extern void shm_destroy_orphaned(struct ipc_namespace *ns); |
| 72 | #else /* CONFIG_SYSVIPC */ |
| 73 | static inline void shm_destroy_orphaned(struct ipc_namespace *ns) {} |
| 74 | #endif /* CONFIG_SYSVIPC */ |
| 75 | |
| 76 | #ifdef CONFIG_POSIX_MQUEUE |
| 77 | extern int mq_init_ns(struct ipc_namespace *ns); |
| 78 | /* |
| 79 | * POSIX Message Queue default values: |
| 80 | * |
| 81 | * MIN_*: Lowest value an admin can set the maximum unprivileged limit to |
| 82 | * DFLT_*MAX: Default values for the maximum unprivileged limits |
| 83 | * DFLT_{MSG,MSGSIZE}: Default values used when the user doesn't supply |
| 84 | * an attribute to the open call and the queue must be created |
| 85 | * HARD_*: Highest value the maximums can be set to. These are enforced |
| 86 | * on CAP_SYS_RESOURCE apps as well making them inviolate (so make them |
| 87 | * suitably high) |
| 88 | * |
| 89 | * POSIX Requirements: |
| 90 | * Per app minimum openable message queues - 8. This does not map well |
| 91 | * to the fact that we limit the number of queues on a per namespace |
| 92 | * basis instead of a per app basis. So, make the default high enough |
| 93 | * that no given app should have a hard time opening 8 queues. |
| 94 | * Minimum maximum for HARD_MSGMAX - 32767. I bumped this to 65536. |
| 95 | * Minimum maximum for HARD_MSGSIZEMAX - POSIX is silent on this. However, |
| 96 | * we have run into a situation where running applications in the wild |
| 97 | * require this to be at least 5MB, and preferably 10MB, so I set the |
| 98 | * value to 16MB in hopes that this user is the worst of the bunch and |
| 99 | * the new maximum will handle anyone else. I may have to revisit this |
| 100 | * in the future. |
| 101 | */ |
| 102 | #define DFLT_QUEUESMAX 256 |
| 103 | #define MIN_MSGMAX 1 |
| 104 | #define DFLT_MSG 10U |
| 105 | #define DFLT_MSGMAX 10 |
| 106 | #define HARD_MSGMAX 65536 |
| 107 | #define MIN_MSGSIZEMAX 128 |
| 108 | #define DFLT_MSGSIZE 8192U |
| 109 | #define DFLT_MSGSIZEMAX 8192 |
| 110 | #define HARD_MSGSIZEMAX (16*1024*1024) |
| 111 | #else |
| 112 | static inline int mq_init_ns(struct ipc_namespace *ns) { return 0; } |
| 113 | #endif |
| 114 | |
| 115 | #if defined(CONFIG_IPC_NS) |
| 116 | extern struct ipc_namespace *copy_ipcs(unsigned long flags, |
| 117 | struct user_namespace *user_ns, struct ipc_namespace *ns); |
| 118 | |
| 119 | static inline struct ipc_namespace *get_ipc_ns(struct ipc_namespace *ns) |
| 120 | { |
| 121 | if (ns) |
| 122 | atomic_inc(&ns->count); |
| 123 | return ns; |
| 124 | } |
| 125 | |
| 126 | extern void put_ipc_ns(struct ipc_namespace *ns); |
| 127 | #else |
| 128 | static inline struct ipc_namespace *copy_ipcs(unsigned long flags, |
| 129 | struct user_namespace *user_ns, struct ipc_namespace *ns) |
| 130 | { |
| 131 | if (flags & CLONE_NEWIPC) |
| 132 | return ERR_PTR(-EINVAL); |
| 133 | |
| 134 | return ns; |
| 135 | } |
| 136 | |
| 137 | static inline struct ipc_namespace *get_ipc_ns(struct ipc_namespace *ns) |
| 138 | { |
| 139 | return ns; |
| 140 | } |
| 141 | |
| 142 | static inline void put_ipc_ns(struct ipc_namespace *ns) |
| 143 | { |
| 144 | } |
| 145 | #endif |
| 146 | |
| 147 | #ifdef CONFIG_POSIX_MQUEUE_SYSCTL |
| 148 | |
| 149 | struct ctl_table_header; |
| 150 | extern struct ctl_table_header *mq_register_sysctl_table(void); |
| 151 | |
| 152 | #else /* CONFIG_POSIX_MQUEUE_SYSCTL */ |
| 153 | |
| 154 | static inline struct ctl_table_header *mq_register_sysctl_table(void) |
| 155 | { |
| 156 | return NULL; |
| 157 | } |
| 158 | |
| 159 | #endif /* CONFIG_POSIX_MQUEUE_SYSCTL */ |
| 160 | #endif |