proc_ns.h 2.6 KB

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  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. #include <linux/ns_common.h>
  8. struct pid_namespace;
  9. struct nsset;
  10. struct path;
  11. struct task_struct;
  12. struct inode;
  13. struct proc_ns_operations {
  14. const char *name;
  15. const char *real_ns_name;
  16. int type;
  17. struct ns_common *(*get)(struct task_struct *task);
  18. void (*put)(struct ns_common *ns);
  19. int (*install)(struct nsset *nsset, struct ns_common *ns);
  20. struct user_namespace *(*owner)(struct ns_common *ns);
  21. struct ns_common *(*get_parent)(struct ns_common *ns);
  22. } __randomize_layout;
  23. extern const struct proc_ns_operations netns_operations;
  24. extern const struct proc_ns_operations utsns_operations;
  25. extern const struct proc_ns_operations ipcns_operations;
  26. extern const struct proc_ns_operations pidns_operations;
  27. extern const struct proc_ns_operations pidns_for_children_operations;
  28. extern const struct proc_ns_operations userns_operations;
  29. extern const struct proc_ns_operations mntns_operations;
  30. extern const struct proc_ns_operations cgroupns_operations;
  31. extern const struct proc_ns_operations timens_operations;
  32. extern const struct proc_ns_operations timens_for_children_operations;
  33. /*
  34. * We always define these enumerators
  35. */
  36. enum {
  37. PROC_ROOT_INO = 1,
  38. PROC_IPC_INIT_INO = 0xEFFFFFFFU,
  39. PROC_UTS_INIT_INO = 0xEFFFFFFEU,
  40. PROC_USER_INIT_INO = 0xEFFFFFFDU,
  41. PROC_PID_INIT_INO = 0xEFFFFFFCU,
  42. PROC_CGROUP_INIT_INO = 0xEFFFFFFBU,
  43. PROC_TIME_INIT_INO = 0xEFFFFFFAU,
  44. };
  45. #ifdef CONFIG_PROC_FS
  46. extern int proc_alloc_inum(unsigned int *pino);
  47. extern void proc_free_inum(unsigned int inum);
  48. #else /* CONFIG_PROC_FS */
  49. static inline int proc_alloc_inum(unsigned int *inum)
  50. {
  51. *inum = 1;
  52. return 0;
  53. }
  54. static inline void proc_free_inum(unsigned int inum) {}
  55. #endif /* CONFIG_PROC_FS */
  56. static inline int ns_alloc_inum(struct ns_common *ns)
  57. {
  58. atomic_long_set(&ns->stashed, 0);
  59. return proc_alloc_inum(&ns->inum);
  60. }
  61. #define ns_free_inum(ns) proc_free_inum((ns)->inum)
  62. extern struct file *proc_ns_fget(int fd);
  63. #define get_proc_ns(inode) ((struct ns_common *)(inode)->i_private)
  64. extern int ns_get_path(struct path *path, struct task_struct *task,
  65. const struct proc_ns_operations *ns_ops);
  66. typedef struct ns_common *ns_get_path_helper_t(void *);
  67. extern int ns_get_path_cb(struct path *path, ns_get_path_helper_t ns_get_cb,
  68. void *private_data);
  69. extern bool ns_match(const struct ns_common *ns, dev_t dev, ino_t ino);
  70. extern int ns_get_name(char *buf, size_t size, struct task_struct *task,
  71. const struct proc_ns_operations *ns_ops);
  72. extern void nsfs_init(void);
  73. #endif /* _LINUX_PROC_NS_H */