/* SPDX-License-Identifier: GPL-2.0 */

  #ifndef _LINUX_UIDGID_H
  #define _LINUX_UIDGID_H
  
  /*
   * A set of types for the internal kernel types representing uids and gids.
   *
   * The types defined in this header allow distinguishing which uids and gids in
   * the kernel are values used by userspace and which uid and gid values are
   * the internal kernel values.  With the addition of user namespaces the values
   * can be different.  Using the type system makes it possible for the compiler
   * to detect when we overlook these differences.
   *
   */
  #include <linux/types.h>
  #include <linux/highuid.h>
  
  struct user_namespace;
  extern struct user_namespace init_user_ns;

  typedef struct {
  	uid_t val;
  } kuid_t;
  
  
  typedef struct {
  	gid_t val;
  } kgid_t;
  
  #define KUIDT_INIT(value) (kuid_t){ value }
  #define KGIDT_INIT(value) (kgid_t){ value }

  #ifdef CONFIG_MULTIUSER

  static inline uid_t __kuid_val(kuid_t uid)
  {
  	return uid.val;
  }
  
  static inline gid_t __kgid_val(kgid_t gid)
  {
  	return gid.val;
  }

  #else
  static inline uid_t __kuid_val(kuid_t uid)
  {
  	return 0;
  }
  
  static inline gid_t __kgid_val(kgid_t gid)
  {
  	return 0;
  }
  #endif

  #define GLOBAL_ROOT_UID KUIDT_INIT(0)
  #define GLOBAL_ROOT_GID KGIDT_INIT(0)
  
  #define INVALID_UID KUIDT_INIT(-1)
  #define INVALID_GID KGIDT_INIT(-1)
  
  static inline bool uid_eq(kuid_t left, kuid_t right)
  {
  	return __kuid_val(left) == __kuid_val(right);
  }
  
  static inline bool gid_eq(kgid_t left, kgid_t right)
  {
  	return __kgid_val(left) == __kgid_val(right);
  }
  
  static inline bool uid_gt(kuid_t left, kuid_t right)
  {
  	return __kuid_val(left) > __kuid_val(right);
  }
  
  static inline bool gid_gt(kgid_t left, kgid_t right)
  {
  	return __kgid_val(left) > __kgid_val(right);
  }
  
  static inline bool uid_gte(kuid_t left, kuid_t right)
  {
  	return __kuid_val(left) >= __kuid_val(right);
  }
  
  static inline bool gid_gte(kgid_t left, kgid_t right)
  {
  	return __kgid_val(left) >= __kgid_val(right);
  }
  
  static inline bool uid_lt(kuid_t left, kuid_t right)
  {
  	return __kuid_val(left) < __kuid_val(right);
  }
  
  static inline bool gid_lt(kgid_t left, kgid_t right)
  {
  	return __kgid_val(left) < __kgid_val(right);
  }
  
  static inline bool uid_lte(kuid_t left, kuid_t right)
  {
  	return __kuid_val(left) <= __kuid_val(right);
  }
  
  static inline bool gid_lte(kgid_t left, kgid_t right)
  {
  	return __kgid_val(left) <= __kgid_val(right);
  }
  
  static inline bool uid_valid(kuid_t uid)
  {

  	return __kuid_val(uid) != (uid_t) -1;

  }
  
  static inline bool gid_valid(kgid_t gid)
  {

  	return __kgid_val(gid) != (gid_t) -1;

  }

  #ifdef CONFIG_USER_NS
  
  extern kuid_t make_kuid(struct user_namespace *from, uid_t uid);
  extern kgid_t make_kgid(struct user_namespace *from, gid_t gid);
  
  extern uid_t from_kuid(struct user_namespace *to, kuid_t uid);
  extern gid_t from_kgid(struct user_namespace *to, kgid_t gid);
  extern uid_t from_kuid_munged(struct user_namespace *to, kuid_t uid);
  extern gid_t from_kgid_munged(struct user_namespace *to, kgid_t gid);
  
  static inline bool kuid_has_mapping(struct user_namespace *ns, kuid_t uid)
  {
  	return from_kuid(ns, uid) != (uid_t) -1;
  }
  
  static inline bool kgid_has_mapping(struct user_namespace *ns, kgid_t gid)
  {
  	return from_kgid(ns, gid) != (gid_t) -1;
  }
  
  #else

  static inline kuid_t make_kuid(struct user_namespace *from, uid_t uid)
  {
  	return KUIDT_INIT(uid);
  }
  
  static inline kgid_t make_kgid(struct user_namespace *from, gid_t gid)
  {
  	return KGIDT_INIT(gid);
  }
  
  static inline uid_t from_kuid(struct user_namespace *to, kuid_t kuid)
  {
  	return __kuid_val(kuid);
  }
  
  static inline gid_t from_kgid(struct user_namespace *to, kgid_t kgid)
  {
  	return __kgid_val(kgid);
  }
  
  static inline uid_t from_kuid_munged(struct user_namespace *to, kuid_t kuid)
  {
  	uid_t uid = from_kuid(to, kuid);
  	if (uid == (uid_t)-1)
  		uid = overflowuid;
  	return uid;
  }
  
  static inline gid_t from_kgid_munged(struct user_namespace *to, kgid_t kgid)
  {
  	gid_t gid = from_kgid(to, kgid);
  	if (gid == (gid_t)-1)
  		gid = overflowgid;
  	return gid;
  }
  
  static inline bool kuid_has_mapping(struct user_namespace *ns, kuid_t uid)
  {

  	return uid_valid(uid);

  }
  
  static inline bool kgid_has_mapping(struct user_namespace *ns, kgid_t gid)
  {

  	return gid_valid(gid);

  }

  #endif /* CONFIG_USER_NS */

  #endif /* _LINUX_UIDGID_H */