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 typedef struct ns_common *ns_get_path_helper_t(void *); 82 extern void *ns_get_path_cb(struct path *path, ns_get_path_helper_t ns_get_cb, 83 void *private_data); 84 85 extern int ns_get_name(char *buf, size_t size, struct task_struct *task, 86 const struct proc_ns_operations *ns_ops); 87 extern void nsfs_init(void); 88 89 #endif /* _LINUX_PROC_NS_H */ 90