#ifndef _IPC_UTIL_H
#define _IPC_UTIL_H
-#include <linux/idr.h>
+#include <linux/err.h>
-#define USHRT_MAX 0xffff
#define SEQ_MULTIPLIER (IPCMNI)
void sem_init (void);
void msg_init (void);
void shm_init (void);
-int sem_init_ns(struct ipc_namespace *ns);
-int msg_init_ns(struct ipc_namespace *ns);
-int shm_init_ns(struct ipc_namespace *ns);
+struct ipc_namespace;
+
+void sem_init_ns(struct ipc_namespace *ns);
+void msg_init_ns(struct ipc_namespace *ns);
+void shm_init_ns(struct ipc_namespace *ns);
void sem_exit_ns(struct ipc_namespace *ns);
void msg_exit_ns(struct ipc_namespace *ns);
void shm_exit_ns(struct ipc_namespace *ns);
-struct ipc_ids {
- int in_use;
- unsigned short seq;
- unsigned short seq_max;
- struct mutex mutex;
- struct idr ipcs_idr;
-};
-
/*
* Structure that holds the parameters needed by the ipc operations
* (see after)
* 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
- * . routine to call to call to check permissions for a new ipc object.
+ * . routine to call to check permissions for a new ipc object.
* 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 *);
- int (*associate) (void *, int);
- int (*more_checks) (void *, struct ipc_params *);
+ int (*associate) (struct kern_ipc_perm *, int);
+ int (*more_checks) (struct kern_ipc_perm *, struct ipc_params *);
};
struct seq_file;
+struct ipc_ids;
void ipc_init_ids(struct ipc_ids *);
#ifdef CONFIG_PROC_FS
#define IPC_MSG_IDS 1
#define IPC_SHM_IDS 2
-/* must be called with ids->mutex acquired.*/
+#define ipcid_to_idx(id) ((id) % SEQ_MULTIPLIER)
+
+/* must be called with ids->rw_mutex acquired for writing */
int ipc_addid(struct ipc_ids *, struct kern_ipc_perm *, int);
+
+/* must be called with ids->rw_mutex acquired for reading */
int ipc_get_maxid(struct ipc_ids *);
/* must be called with both locks acquired. */
void ipc_rmid(struct ipc_ids *, struct kern_ipc_perm *);
-int ipcperms (struct kern_ipc_perm *ipcp, short flg);
+/* must be called with ipcp locked */
+int ipcperms(struct kern_ipc_perm *ipcp, short flg);
/* for rare, potentially huge allocations.
* both function can sleep
void ipc_rcu_getref(void *ptr);
void ipc_rcu_putref(void *ptr);
-struct kern_ipc_perm* ipc_lock(struct ipc_ids* ids, int id);
-void ipc_lock_by_ptr(struct kern_ipc_perm *ipcp);
-void ipc_unlock(struct kern_ipc_perm* perm);
-int ipc_buildid(struct ipc_ids* ids, int id, int seq);
-int ipc_checkid(struct ipc_ids* ids, struct kern_ipc_perm* ipcp, int uid);
+/*
+ * ipc_lock_down: called with rw_mutex held
+ * ipc_lock: called without that lock held
+ */
+struct kern_ipc_perm *ipc_lock_down(struct ipc_ids *, int);
+struct kern_ipc_perm *ipc_lock(struct ipc_ids *, int);
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);
+void ipc_update_perm(struct ipc64_perm *in, struct kern_ipc_perm *out);
+struct kern_ipc_perm *ipcctl_pre_down(struct ipc_ids *ids, int id, int cmd,
+ struct ipc64_perm *perm, int extra_perm);
#if defined(__ia64__) || defined(__x86_64__) || defined(__hppa__) || defined(__XTENSA__)
/* On IA-64, we always use the "64-bit version" of the IPC structures. */
extern void free_msg(struct msg_msg *msg);
extern struct msg_msg *load_msg(const void __user *src, int len);
extern int store_msg(void __user *dest, struct msg_msg *msg, int len);
-extern int ipcget_new(struct ipc_namespace *, struct ipc_ids *,
- struct ipc_ops *, struct ipc_params *);
-extern int ipcget_public(struct ipc_namespace *, struct ipc_ids *,
- struct ipc_ops *, struct ipc_params *);
-static inline int ipcget(struct ipc_namespace *ns, struct ipc_ids *ids,
- struct ipc_ops *ops, struct ipc_params *params)
+extern void recompute_msgmni(struct ipc_namespace *);
+
+static inline int ipc_buildid(int id, int seq)
+{
+ return SEQ_MULTIPLIER * seq + id;
+}
+
+/*
+ * Must be called with ipcp locked
+ */
+static inline int ipc_checkid(struct kern_ipc_perm *ipcp, int uid)
+{
+ if (uid / SEQ_MULTIPLIER != ipcp->seq)
+ return 1;
+ return 0;
+}
+
+static inline void ipc_lock_by_ptr(struct kern_ipc_perm *perm)
{
- if (params->key == IPC_PRIVATE)
- return ipcget_new(ns, ids, ops, params);
- else
- return ipcget_public(ns, ids, ops, params);
+ rcu_read_lock();
+ spin_lock(&perm->lock);
}
+static inline void ipc_unlock(struct kern_ipc_perm *perm)
+{
+ spin_unlock(&perm->lock);
+ rcu_read_unlock();
+}
+
+struct kern_ipc_perm *ipc_lock_check_down(struct ipc_ids *ids, int id);
+struct kern_ipc_perm *ipc_lock_check(struct ipc_ids *ids, int id);
+int ipcget(struct ipc_namespace *ns, struct ipc_ids *ids,
+ struct ipc_ops *ops, struct ipc_params *params);
+
#endif