1 files changed, 88 insertions, 0 deletions
diff --git a/include/linux/proc_ns.h b/include/linux/proc_ns.h
new file mode 100644
index 000000000..49539bc41
--- /dev/null
+++ b/include/linux/proc_ns.h
@@ -0,0 +1,88 @@
+/* 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 nsset;
+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 nsset *nsset, 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;
+extern const struct proc_ns_operations timens_operations;
+extern const struct proc_ns_operations timens_for_children_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,
+	PROC_TIME_INIT_INO	= 0xEFFFFFFAU,
+};
+
+#ifdef CONFIG_PROC_FS
+
+extern int proc_alloc_inum(unsigned int *pino);
+extern void proc_free_inum(unsigned int inum);
+
+#else /* CONFIG_PROC_FS */
+
+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)
+
+#define get_proc_ns(inode) ((struct ns_common *)(inode)->i_private)
+extern int 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 int ns_get_path_cb(struct path *path, ns_get_path_helper_t ns_get_cb,
+			    void *private_data);
+
+extern bool ns_match(const struct ns_common *ns, dev_t dev, ino_t ino);
+
+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 */