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TOMOYO Linux Cross Reference
Linux/include/linux/proc_ns.h

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  1 /* SPDX-License-Identifier: GPL-2.0 */
  2 /*
  3  * procfs namespace bits
  4  */
  5 #ifndef _LINUX_PROC_NS_H
  6 #define _LINUX_PROC_NS_H
  7 
  8 #include <linux/ns_common.h>
  9 
 10 struct pid_namespace;
 11 struct nsproxy;
 12 struct path;
 13 struct task_struct;
 14 struct inode;
 15 
 16 struct proc_ns_operations {
 17         const char *name;
 18         const char *real_ns_name;
 19         int type;
 20         struct ns_common *(*get)(struct task_struct *task);
 21         void (*put)(struct ns_common *ns);
 22         int (*install)(struct nsproxy *nsproxy, struct ns_common *ns);
 23         struct user_namespace *(*owner)(struct ns_common *ns);
 24         struct ns_common *(*get_parent)(struct ns_common *ns);
 25 } __randomize_layout;
 26 
 27 extern const struct proc_ns_operations netns_operations;
 28 extern const struct proc_ns_operations utsns_operations;
 29 extern const struct proc_ns_operations ipcns_operations;
 30 extern const struct proc_ns_operations pidns_operations;
 31 extern const struct proc_ns_operations pidns_for_children_operations;
 32 extern const struct proc_ns_operations userns_operations;
 33 extern const struct proc_ns_operations mntns_operations;
 34 extern const struct proc_ns_operations cgroupns_operations;
 35 
 36 /*
 37  * We always define these enumerators
 38  */
 39 enum {
 40         PROC_ROOT_INO           = 1,
 41         PROC_IPC_INIT_INO       = 0xEFFFFFFFU,
 42         PROC_UTS_INIT_INO       = 0xEFFFFFFEU,
 43         PROC_USER_INIT_INO      = 0xEFFFFFFDU,
 44         PROC_PID_INIT_INO       = 0xEFFFFFFCU,
 45         PROC_CGROUP_INIT_INO    = 0xEFFFFFFBU,
 46 };
 47 
 48 #ifdef CONFIG_PROC_FS
 49 
 50 extern int pid_ns_prepare_proc(struct pid_namespace *ns);
 51 extern void pid_ns_release_proc(struct pid_namespace *ns);
 52 extern int proc_alloc_inum(unsigned int *pino);
 53 extern void proc_free_inum(unsigned int inum);
 54 
 55 #else /* CONFIG_PROC_FS */
 56 
 57 static inline int pid_ns_prepare_proc(struct pid_namespace *ns) { return 0; }
 58 static inline void pid_ns_release_proc(struct pid_namespace *ns) {}
 59 
 60 static inline int proc_alloc_inum(unsigned int *inum)
 61 {
 62         *inum = 1;
 63         return 0;
 64 }
 65 static inline void proc_free_inum(unsigned int inum) {}
 66 
 67 #endif /* CONFIG_PROC_FS */
 68 
 69 static inline int ns_alloc_inum(struct ns_common *ns)
 70 {
 71         atomic_long_set(&ns->stashed, 0);
 72         return proc_alloc_inum(&ns->inum);
 73 }
 74 
 75 #define ns_free_inum(ns) proc_free_inum((ns)->inum)
 76 
 77 extern struct file *proc_ns_fget(int fd);
 78 #define get_proc_ns(inode) ((struct ns_common *)(inode)->i_private)
 79 extern void *ns_get_path(struct path *path, struct task_struct *task,
 80                         const struct proc_ns_operations *ns_ops);
 81 
 82 extern int ns_get_name(char *buf, size_t size, struct task_struct *task,
 83                         const struct proc_ns_operations *ns_ops);
 84 extern void nsfs_init(void);
 85 
 86 #endif /* _LINUX_PROC_NS_H */
 87 

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