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