/* SPDX-License-Identifier: GPL-2.0 */ /* * procfs namespace bits */ #ifndef _LINUX_PROC_NS_H #define _LINUX_PROC_NS_H #include <linux/ns_common.h> struct pid_namespace; struct nsproxy; struct path; struct task_struct; struct inode; struct proc_ns_operations { const char *name; const char *real_ns_name; int type; struct ns_common *(*get)(struct task_struct *task); void (*put)(struct ns_common *ns); int (*install)(struct nsproxy *nsproxy, struct ns_common *ns); struct user_namespace *(*owner)(struct ns_common *ns); struct ns_common *(*get_parent)(struct ns_common *ns); } __randomize_layout; extern const struct proc_ns_operations netns_operations; extern const struct proc_ns_operations utsns_operations; extern const struct proc_ns_operations ipcns_operations; extern const struct proc_ns_operations pidns_operations; extern const struct proc_ns_operations pidns_for_children_operations; extern const struct proc_ns_operations userns_operations; extern const struct proc_ns_operations mntns_operations; extern const struct proc_ns_operations cgroupns_operations; /* * We always define these enumerators */ enum { PROC_ROOT_INO = 1, PROC_IPC_INIT_INO = 0xEFFFFFFFU, PROC_UTS_INIT_INO = 0xEFFFFFFEU, PROC_USER_INIT_INO = 0xEFFFFFFDU, PROC_PID_INIT_INO = 0xEFFFFFFCU, PROC_CGROUP_INIT_INO = 0xEFFFFFFBU, }; #ifdef CONFIG_PROC_FS extern int pid_ns_prepare_proc(struct pid_namespace *ns); extern void pid_ns_release_proc(struct pid_namespace *ns); extern int proc_alloc_inum(unsigned int *pino); extern void proc_free_inum(unsigned int inum); #else /* CONFIG_PROC_FS */ static inline int pid_ns_prepare_proc(struct pid_namespace *ns) { return 0; } static inline void pid_ns_release_proc(struct pid_namespace *ns) {} static inline int proc_alloc_inum(unsigned int *inum) { *inum = 1; return 0; } static inline void proc_free_inum(unsigned int inum) {} #endif /* CONFIG_PROC_FS */ static inline int ns_alloc_inum(struct ns_common *ns) { atomic_long_set(&ns->stashed, 0); return proc_alloc_inum(&ns->inum); } #define ns_free_inum(ns) proc_free_inum((ns)->inum) extern struct file *proc_ns_fget(int fd); #define get_proc_ns(inode) ((struct ns_common *)(inode)->i_private) extern void *ns_get_path(struct path *path, struct task_struct *task, const struct proc_ns_operations *ns_ops); typedef struct ns_common *ns_get_path_helper_t(void *); extern void *ns_get_path_cb(struct path *path, ns_get_path_helper_t ns_get_cb, void *private_data); extern int ns_get_name(char *buf, size_t size, struct task_struct *task, const struct proc_ns_operations *ns_ops); extern void nsfs_init(void); #endif /* _LINUX_PROC_NS_H */