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ipc/util.h
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/* * linux/ipc/util.h * Copyright (C) 1999 Christoph Rohland * |
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* ipc helper functions (c) 1999 Manfred Spraul <manfred@colorfullife.com> |
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* namespaces support. 2006 OpenVZ, SWsoft Inc. * Pavel Emelianov <xemul@openvz.org> |
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*/ #ifndef _IPC_UTIL_H #define _IPC_UTIL_H |
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#include <linux/unistd.h> |
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#include <linux/err.h> |
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#define SEQ_MULTIPLIER (IPCMNI) |
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void sem_init(void); void msg_init(void); void shm_init(void); |
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struct ipc_namespace; |
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#ifdef CONFIG_POSIX_MQUEUE |
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extern void mq_clear_sbinfo(struct ipc_namespace *ns); extern void mq_put_mnt(struct ipc_namespace *ns); |
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#else |
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static inline void mq_clear_sbinfo(struct ipc_namespace *ns) { } static inline void mq_put_mnt(struct ipc_namespace *ns) { } |
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#endif #ifdef CONFIG_SYSVIPC |
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void sem_init_ns(struct ipc_namespace *ns); void msg_init_ns(struct ipc_namespace *ns); void shm_init_ns(struct ipc_namespace *ns); |
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void sem_exit_ns(struct ipc_namespace *ns); void msg_exit_ns(struct ipc_namespace *ns); void shm_exit_ns(struct ipc_namespace *ns); |
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#else static inline void sem_init_ns(struct ipc_namespace *ns) { } static inline void msg_init_ns(struct ipc_namespace *ns) { } static inline void shm_init_ns(struct ipc_namespace *ns) { } static inline void sem_exit_ns(struct ipc_namespace *ns) { } static inline void msg_exit_ns(struct ipc_namespace *ns) { } static inline void shm_exit_ns(struct ipc_namespace *ns) { } #endif |
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struct ipc_rcu { struct rcu_head rcu; atomic_t refcount; } ____cacheline_aligned_in_smp; #define ipc_rcu_to_struct(p) ((void *)(p+1)) |
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/* * Structure that holds the parameters needed by the ipc operations * (see after) */ struct ipc_params { key_t key; int flg; union { size_t size; /* for shared memories */ int nsems; /* for semaphores */ } u; /* holds the getnew() specific param */ }; /* * Structure that holds some ipc operations. This structure is used to unify * the calls to sys_msgget(), sys_semget(), sys_shmget() * . routine to call to create a new ipc object. Can be one of newque, * newary, newseg |
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* . routine to call to check permissions for a new ipc object. |
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* Can be one of security_msg_associate, security_sem_associate, * security_shm_associate * . routine to call for an extra check if needed */ struct ipc_ops { int (*getnew) (struct ipc_namespace *, struct ipc_params *); |
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int (*associate) (struct kern_ipc_perm *, int); int (*more_checks) (struct kern_ipc_perm *, struct ipc_params *); |
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}; |
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struct seq_file; |
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struct ipc_ids; |
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void ipc_init_ids(struct ipc_ids *); |
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#ifdef CONFIG_PROC_FS void __init ipc_init_proc_interface(const char *path, const char *header, |
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int ids, int (*show)(struct seq_file *, void *)); |
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#else #define ipc_init_proc_interface(path, header, ids, show) do {} while (0) #endif |
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#define IPC_SEM_IDS 0 #define IPC_MSG_IDS 1 #define IPC_SHM_IDS 2 |
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#define ipcid_to_idx(id) ((id) % SEQ_MULTIPLIER) |
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#define ipcid_to_seqx(id) ((id) / SEQ_MULTIPLIER) |
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#define IPCID_SEQ_MAX min_t(int, INT_MAX/SEQ_MULTIPLIER, USHRT_MAX) |
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/* must be called with ids->rwsem acquired for writing */ |
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int ipc_addid(struct ipc_ids *, struct kern_ipc_perm *, int); |
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/* must be called with ids->rwsem acquired for reading */ |
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int ipc_get_maxid(struct ipc_ids *); |
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/* must be called with both locks acquired. */ |
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void ipc_rmid(struct ipc_ids *, struct kern_ipc_perm *); |
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/* must be called with ipcp locked */ |
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int ipcperms(struct ipc_namespace *ns, struct kern_ipc_perm *ipcp, short flg); |
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/* for rare, potentially huge allocations. * both function can sleep */ |
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void *ipc_alloc(int size); void ipc_free(void *ptr, int size); |
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/* * For allocation that need to be freed by RCU. * Objects are reference counted, they start with reference count 1. * getref increases the refcount, the putref call that reduces the recount * to 0 schedules the rcu destruction. Caller must guarantee locking. */ |
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void *ipc_rcu_alloc(int size); |
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int ipc_rcu_getref(void *ptr); |
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void ipc_rcu_putref(void *ptr, void (*func)(struct rcu_head *head)); void ipc_rcu_free(struct rcu_head *head); |
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struct kern_ipc_perm *ipc_lock(struct ipc_ids *, int); |
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struct kern_ipc_perm *ipc_obtain_object(struct ipc_ids *ids, int id); |
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void kernel_to_ipc64_perm(struct kern_ipc_perm *in, struct ipc64_perm *out); void ipc64_perm_to_ipc_perm(struct ipc64_perm *in, struct ipc_perm *out); |
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int ipc_update_perm(struct ipc64_perm *in, struct kern_ipc_perm *out); |
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struct kern_ipc_perm *ipcctl_pre_down_nolock(struct ipc_namespace *ns, struct ipc_ids *ids, int id, int cmd, struct ipc64_perm *perm, int extra_perm); |
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#ifndef CONFIG_ARCH_WANT_IPC_PARSE_VERSION |
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/* On IA-64, we always use the "64-bit version" of the IPC structures. */ # define ipc_parse_version(cmd) IPC_64 #else |
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int ipc_parse_version(int *cmd); |
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#endif extern void free_msg(struct msg_msg *msg); |
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extern struct msg_msg *load_msg(const void __user *src, size_t len); |
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extern struct msg_msg *copy_msg(struct msg_msg *src, struct msg_msg *dst); |
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extern int store_msg(void __user *dest, struct msg_msg *msg, size_t len); |
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extern void recompute_msgmni(struct ipc_namespace *); |
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static inline int ipc_buildid(int id, int seq) |
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{ return SEQ_MULTIPLIER * seq + id; } |
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static inline int ipc_checkid(struct kern_ipc_perm *ipcp, int uid) |
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{ |
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return uid / SEQ_MULTIPLIER != ipcp->seq; |
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} |
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static inline void ipc_lock_object(struct kern_ipc_perm *perm) |
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{ |
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spin_lock(&perm->lock); } |
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static inline void ipc_unlock_object(struct kern_ipc_perm *perm) |
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{ spin_unlock(&perm->lock); |
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} |
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static inline void ipc_assert_locked_object(struct kern_ipc_perm *perm) |
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{ |
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assert_spin_locked(&perm->lock); } |
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static inline void ipc_unlock(struct kern_ipc_perm *perm) { |
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ipc_unlock_object(perm); |
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rcu_read_unlock(); } |
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/* * ipc_valid_object() - helper to sort out IPC_RMID races for codepaths * where the respective ipc_ids.rwsem is not being held down. * Checks whether the ipc object is still around or if it's gone already, as * ipc_rmid() may have already freed the ID while the ipc lock was spinning. * Needs to be called with kern_ipc_perm.lock held -- exception made for one * checkpoint case at sys_semtimedop() as noted in code commentary. */ static inline bool ipc_valid_object(struct kern_ipc_perm *perm) { |
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return !perm->deleted; |
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} |
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struct kern_ipc_perm *ipc_obtain_object_check(struct ipc_ids *ids, int id); |
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int ipcget(struct ipc_namespace *ns, struct ipc_ids *ids, struct ipc_ops *ops, struct ipc_params *params); |
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void free_ipcs(struct ipc_namespace *ns, struct ipc_ids *ids, void (*free)(struct ipc_namespace *, struct kern_ipc_perm *)); |
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#endif |