Linux kernel mirror (for testing)
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1/* SPDX-License-Identifier: GPL-2.0 */
2/*
3 * The proc filesystem constants/structures
4 */
5#ifndef _LINUX_PROC_FS_H
6#define _LINUX_PROC_FS_H
7
8#include <linux/compiler.h>
9#include <linux/types.h>
10#include <linux/fs.h>
11
12struct proc_dir_entry;
13struct seq_file;
14struct seq_operations;
15
16enum {
17 /*
18 * All /proc entries using this ->proc_ops instance are never removed.
19 *
20 * If in doubt, ignore this flag.
21 */
22#ifdef MODULE
23 PROC_ENTRY_PERMANENT = 0U,
24#else
25 PROC_ENTRY_PERMANENT = 1U << 0,
26#endif
27
28 PROC_ENTRY_proc_read_iter = 1U << 1,
29 PROC_ENTRY_proc_compat_ioctl = 1U << 2,
30 PROC_ENTRY_proc_lseek = 1U << 3,
31
32 PROC_ENTRY_FORCE_LOOKUP = 1U << 7,
33};
34
35struct proc_ops {
36 unsigned int proc_flags;
37 int (*proc_open)(struct inode *, struct file *);
38 ssize_t (*proc_read)(struct file *, char __user *, size_t, loff_t *);
39 ssize_t (*proc_read_iter)(struct kiocb *, struct iov_iter *);
40 ssize_t (*proc_write)(struct file *, const char __user *, size_t, loff_t *);
41 /* mandatory unless nonseekable_open() or equivalent is used */
42 loff_t (*proc_lseek)(struct file *, loff_t, int);
43 int (*proc_release)(struct inode *, struct file *);
44 __poll_t (*proc_poll)(struct file *, struct poll_table_struct *);
45 long (*proc_ioctl)(struct file *, unsigned int, unsigned long);
46#ifdef CONFIG_COMPAT
47 long (*proc_compat_ioctl)(struct file *, unsigned int, unsigned long);
48#endif
49 int (*proc_mmap)(struct file *, struct vm_area_struct *);
50 unsigned long (*proc_get_unmapped_area)(struct file *, unsigned long, unsigned long, unsigned long, unsigned long);
51} __randomize_layout;
52
53/* definitions for hide_pid field */
54enum proc_hidepid {
55 HIDEPID_OFF = 0,
56 HIDEPID_NO_ACCESS = 1,
57 HIDEPID_INVISIBLE = 2,
58 HIDEPID_NOT_PTRACEABLE = 4, /* Limit pids to only ptraceable pids */
59};
60
61/* definitions for proc mount option pidonly */
62enum proc_pidonly {
63 PROC_PIDONLY_OFF = 0,
64 PROC_PIDONLY_ON = 1,
65};
66
67struct proc_fs_info {
68 struct pid_namespace *pid_ns;
69 struct dentry *proc_self; /* For /proc/self */
70 struct dentry *proc_thread_self; /* For /proc/thread-self */
71 kgid_t pid_gid;
72 enum proc_hidepid hide_pid;
73 enum proc_pidonly pidonly;
74 struct rcu_head rcu;
75};
76
77static inline struct proc_fs_info *proc_sb_info(struct super_block *sb)
78{
79 return sb->s_fs_info;
80}
81
82#ifdef CONFIG_PROC_FS
83
84typedef int (*proc_write_t)(struct file *, char *, size_t);
85
86extern void proc_root_init(void);
87extern void proc_flush_pid(struct pid *);
88
89extern struct proc_dir_entry *proc_symlink(const char *,
90 struct proc_dir_entry *, const char *);
91struct proc_dir_entry *_proc_mkdir(const char *, umode_t, struct proc_dir_entry *, void *, bool);
92extern struct proc_dir_entry *proc_mkdir(const char *, struct proc_dir_entry *);
93extern struct proc_dir_entry *proc_mkdir_data(const char *, umode_t,
94 struct proc_dir_entry *, void *);
95extern struct proc_dir_entry *proc_mkdir_mode(const char *, umode_t,
96 struct proc_dir_entry *);
97struct proc_dir_entry *proc_create_mount_point(const char *name);
98
99struct proc_dir_entry *proc_create_seq_private(const char *name, umode_t mode,
100 struct proc_dir_entry *parent, const struct seq_operations *ops,
101 unsigned int state_size, void *data);
102#define proc_create_seq_data(name, mode, parent, ops, data) \
103 proc_create_seq_private(name, mode, parent, ops, 0, data)
104#define proc_create_seq(name, mode, parent, ops) \
105 proc_create_seq_private(name, mode, parent, ops, 0, NULL)
106struct proc_dir_entry *proc_create_single_data(const char *name, umode_t mode,
107 struct proc_dir_entry *parent,
108 int (*show)(struct seq_file *, void *), void *data);
109#define proc_create_single(name, mode, parent, show) \
110 proc_create_single_data(name, mode, parent, show, NULL)
111
112extern struct proc_dir_entry *proc_create_data(const char *, umode_t,
113 struct proc_dir_entry *,
114 const struct proc_ops *,
115 void *);
116
117struct proc_dir_entry *proc_create(const char *name, umode_t mode, struct proc_dir_entry *parent, const struct proc_ops *proc_ops);
118extern void proc_set_size(struct proc_dir_entry *, loff_t);
119extern void proc_set_user(struct proc_dir_entry *, kuid_t, kgid_t);
120
121/*
122 * Obtain the private data passed by user through proc_create_data() or
123 * related.
124 */
125static inline void *pde_data(const struct inode *inode)
126{
127 return inode->i_private;
128}
129
130extern void *proc_get_parent_data(const struct inode *);
131extern void proc_remove(struct proc_dir_entry *);
132extern void remove_proc_entry(const char *, struct proc_dir_entry *);
133extern int remove_proc_subtree(const char *, struct proc_dir_entry *);
134
135struct proc_dir_entry *proc_create_net_data(const char *name, umode_t mode,
136 struct proc_dir_entry *parent, const struct seq_operations *ops,
137 unsigned int state_size, void *data);
138#define proc_create_net(name, mode, parent, ops, state_size) \
139 proc_create_net_data(name, mode, parent, ops, state_size, NULL)
140struct proc_dir_entry *proc_create_net_single(const char *name, umode_t mode,
141 struct proc_dir_entry *parent,
142 int (*show)(struct seq_file *, void *), void *data);
143struct proc_dir_entry *proc_create_net_data_write(const char *name, umode_t mode,
144 struct proc_dir_entry *parent,
145 const struct seq_operations *ops,
146 proc_write_t write,
147 unsigned int state_size, void *data);
148struct proc_dir_entry *proc_create_net_single_write(const char *name, umode_t mode,
149 struct proc_dir_entry *parent,
150 int (*show)(struct seq_file *, void *),
151 proc_write_t write,
152 void *data);
153extern struct pid *tgid_pidfd_to_pid(const struct file *file);
154
155struct bpf_iter_aux_info;
156extern int bpf_iter_init_seq_net(void *priv_data, struct bpf_iter_aux_info *aux);
157extern void bpf_iter_fini_seq_net(void *priv_data);
158
159#ifdef CONFIG_PROC_PID_ARCH_STATUS
160/*
161 * The architecture which selects CONFIG_PROC_PID_ARCH_STATUS must
162 * provide proc_pid_arch_status() definition.
163 */
164int proc_pid_arch_status(struct seq_file *m, struct pid_namespace *ns,
165 struct pid *pid, struct task_struct *task);
166#endif /* CONFIG_PROC_PID_ARCH_STATUS */
167
168void arch_report_meminfo(struct seq_file *m);
169void arch_proc_pid_thread_features(struct seq_file *m, struct task_struct *task);
170
171#else /* CONFIG_PROC_FS */
172
173static inline void proc_root_init(void)
174{
175}
176
177static inline void proc_flush_pid(struct pid *pid)
178{
179}
180
181static inline struct proc_dir_entry *proc_symlink(const char *name,
182 struct proc_dir_entry *parent,const char *dest) { return NULL;}
183static inline struct proc_dir_entry *proc_mkdir(const char *name,
184 struct proc_dir_entry *parent) {return NULL;}
185static inline struct proc_dir_entry *proc_create_mount_point(const char *name) { return NULL; }
186static inline struct proc_dir_entry *_proc_mkdir(const char *name, umode_t mode,
187 struct proc_dir_entry *parent, void *data, bool force_lookup)
188{
189 return NULL;
190}
191static inline struct proc_dir_entry *proc_mkdir_data(const char *name,
192 umode_t mode, struct proc_dir_entry *parent, void *data) { return NULL; }
193static inline struct proc_dir_entry *proc_mkdir_mode(const char *name,
194 umode_t mode, struct proc_dir_entry *parent) { return NULL; }
195#define proc_create_seq_private(name, mode, parent, ops, size, data) ({NULL;})
196#define proc_create_seq_data(name, mode, parent, ops, data) ({NULL;})
197#define proc_create_seq(name, mode, parent, ops) ({NULL;})
198#define proc_create_single(name, mode, parent, show) ({NULL;})
199#define proc_create_single_data(name, mode, parent, show, data) ({NULL;})
200
201static inline struct proc_dir_entry *
202proc_create(const char *name, umode_t mode, struct proc_dir_entry *parent,
203 const struct proc_ops *proc_ops)
204{ return NULL; }
205
206static inline struct proc_dir_entry *
207proc_create_data(const char *name, umode_t mode, struct proc_dir_entry *parent,
208 const struct proc_ops *proc_ops, void *data)
209{ return NULL; }
210
211static inline void proc_set_size(struct proc_dir_entry *de, loff_t size) {}
212static inline void proc_set_user(struct proc_dir_entry *de, kuid_t uid, kgid_t gid) {}
213static inline void *pde_data(const struct inode *inode) {BUG(); return NULL;}
214static inline void *proc_get_parent_data(const struct inode *inode) { BUG(); return NULL; }
215
216static inline void proc_remove(struct proc_dir_entry *de) {}
217#define remove_proc_entry(name, parent) do {} while (0)
218static inline int remove_proc_subtree(const char *name, struct proc_dir_entry *parent) { return 0; }
219
220#define proc_create_net_data(name, mode, parent, ops, state_size, data) ({NULL;})
221#define proc_create_net_data_write(name, mode, parent, ops, write, state_size, data) ({NULL;})
222#define proc_create_net(name, mode, parent, state_size, ops) ({NULL;})
223#define proc_create_net_single(name, mode, parent, show, data) ({NULL;})
224#define proc_create_net_single_write(name, mode, parent, show, write, data) ({NULL;})
225
226static inline struct pid *tgid_pidfd_to_pid(const struct file *file)
227{
228 return ERR_PTR(-EBADF);
229}
230
231#endif /* CONFIG_PROC_FS */
232
233struct net;
234
235static inline struct proc_dir_entry *proc_net_mkdir(
236 struct net *net, const char *name, struct proc_dir_entry *parent)
237{
238 return _proc_mkdir(name, 0, parent, net, true);
239}
240
241struct ns_common;
242int open_related_ns(struct ns_common *ns,
243 struct ns_common *(*get_ns)(struct ns_common *ns));
244
245/* get the associated pid namespace for a file in procfs */
246static inline struct pid_namespace *proc_pid_ns(struct super_block *sb)
247{
248 return proc_sb_info(sb)->pid_ns;
249}
250
251bool proc_ns_file(const struct file *file);
252
253#endif /* _LINUX_PROC_FS_H */