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1/* Internal procfs definitions
2 *
3 * Copyright (C) 2004 Red Hat, Inc. All Rights Reserved.
4 * Written by David Howells (dhowells@redhat.com)
5 *
6 * This program is free software; you can redistribute it and/or
7 * modify it under the terms of the GNU General Public License
8 * as published by the Free Software Foundation; either version
9 * 2 of the License, or (at your option) any later version.
10 */
11
12#include <linux/proc_fs.h>
13#include <linux/proc_ns.h>
14#include <linux/spinlock.h>
15#include <linux/atomic.h>
16#include <linux/binfmts.h>
17#include <linux/sched/coredump.h>
18#include <linux/sched/task.h>
19
20struct ctl_table_header;
21struct mempolicy;
22
23/*
24 * This is not completely implemented yet. The idea is to
25 * create an in-memory tree (like the actual /proc filesystem
26 * tree) of these proc_dir_entries, so that we can dynamically
27 * add new files to /proc.
28 *
29 * parent/subdir are used for the directory structure (every /proc file has a
30 * parent, but "subdir" is empty for all non-directory entries).
31 * subdir_node is used to build the rb tree "subdir" of the parent.
32 */
33struct proc_dir_entry {
34 unsigned int low_ino;
35 umode_t mode;
36 nlink_t nlink;
37 kuid_t uid;
38 kgid_t gid;
39 loff_t size;
40 const struct inode_operations *proc_iops;
41 const struct file_operations *proc_fops;
42 struct proc_dir_entry *parent;
43 struct rb_root subdir;
44 struct rb_node subdir_node;
45 void *data;
46 atomic_t count; /* use count */
47 atomic_t in_use; /* number of callers into module in progress; */
48 /* negative -> it's going away RSN */
49 struct completion *pde_unload_completion;
50 struct list_head pde_openers; /* who did ->open, but not ->release */
51 spinlock_t pde_unload_lock; /* proc_fops checks and pde_users bumps */
52 u8 namelen;
53 char name[];
54} __randomize_layout;
55
56union proc_op {
57 int (*proc_get_link)(struct dentry *, struct path *);
58 int (*proc_show)(struct seq_file *m,
59 struct pid_namespace *ns, struct pid *pid,
60 struct task_struct *task);
61};
62
63struct proc_inode {
64 struct pid *pid;
65 unsigned int fd;
66 union proc_op op;
67 struct proc_dir_entry *pde;
68 struct ctl_table_header *sysctl;
69 struct ctl_table *sysctl_entry;
70 struct hlist_node sysctl_inodes;
71 const struct proc_ns_operations *ns_ops;
72 struct inode vfs_inode;
73} __randomize_layout;
74
75/*
76 * General functions
77 */
78static inline struct proc_inode *PROC_I(const struct inode *inode)
79{
80 return container_of(inode, struct proc_inode, vfs_inode);
81}
82
83static inline struct proc_dir_entry *PDE(const struct inode *inode)
84{
85 return PROC_I(inode)->pde;
86}
87
88static inline void *__PDE_DATA(const struct inode *inode)
89{
90 return PDE(inode)->data;
91}
92
93static inline struct pid *proc_pid(struct inode *inode)
94{
95 return PROC_I(inode)->pid;
96}
97
98static inline struct task_struct *get_proc_task(struct inode *inode)
99{
100 return get_pid_task(proc_pid(inode), PIDTYPE_PID);
101}
102
103void task_dump_owner(struct task_struct *task, mode_t mode,
104 kuid_t *ruid, kgid_t *rgid);
105
106static inline unsigned name_to_int(const struct qstr *qstr)
107{
108 const char *name = qstr->name;
109 int len = qstr->len;
110 unsigned n = 0;
111
112 if (len > 1 && *name == '0')
113 goto out;
114 while (len-- > 0) {
115 unsigned c = *name++ - '0';
116 if (c > 9)
117 goto out;
118 if (n >= (~0U-9)/10)
119 goto out;
120 n *= 10;
121 n += c;
122 }
123 return n;
124out:
125 return ~0U;
126}
127
128/*
129 * Offset of the first process in the /proc root directory..
130 */
131#define FIRST_PROCESS_ENTRY 256
132
133/* Worst case buffer size needed for holding an integer. */
134#define PROC_NUMBUF 13
135
136/*
137 * array.c
138 */
139extern const struct file_operations proc_tid_children_operations;
140
141extern int proc_tid_stat(struct seq_file *, struct pid_namespace *,
142 struct pid *, struct task_struct *);
143extern int proc_tgid_stat(struct seq_file *, struct pid_namespace *,
144 struct pid *, struct task_struct *);
145extern int proc_pid_status(struct seq_file *, struct pid_namespace *,
146 struct pid *, struct task_struct *);
147extern int proc_pid_statm(struct seq_file *, struct pid_namespace *,
148 struct pid *, struct task_struct *);
149
150/*
151 * base.c
152 */
153extern const struct dentry_operations pid_dentry_operations;
154extern int pid_getattr(const struct path *, struct kstat *, u32, unsigned int);
155extern int proc_setattr(struct dentry *, struct iattr *);
156extern struct inode *proc_pid_make_inode(struct super_block *, struct task_struct *, umode_t);
157extern int pid_revalidate(struct dentry *, unsigned int);
158extern int pid_delete_dentry(const struct dentry *);
159extern int proc_pid_readdir(struct file *, struct dir_context *);
160extern struct dentry *proc_pid_lookup(struct inode *, struct dentry *, unsigned int);
161extern loff_t mem_lseek(struct file *, loff_t, int);
162
163/* Lookups */
164typedef int instantiate_t(struct inode *, struct dentry *,
165 struct task_struct *, const void *);
166extern bool proc_fill_cache(struct file *, struct dir_context *, const char *, int,
167 instantiate_t, struct task_struct *, const void *);
168
169/*
170 * generic.c
171 */
172extern struct dentry *proc_lookup(struct inode *, struct dentry *, unsigned int);
173extern struct dentry *proc_lookup_de(struct proc_dir_entry *, struct inode *,
174 struct dentry *);
175extern int proc_readdir(struct file *, struct dir_context *);
176extern int proc_readdir_de(struct proc_dir_entry *, struct file *, struct dir_context *);
177
178static inline struct proc_dir_entry *pde_get(struct proc_dir_entry *pde)
179{
180 atomic_inc(&pde->count);
181 return pde;
182}
183extern void pde_put(struct proc_dir_entry *);
184
185static inline bool is_empty_pde(const struct proc_dir_entry *pde)
186{
187 return S_ISDIR(pde->mode) && !pde->proc_iops;
188}
189
190/*
191 * inode.c
192 */
193struct pde_opener {
194 struct file *file;
195 struct list_head lh;
196 bool closing;
197 struct completion *c;
198};
199extern const struct inode_operations proc_link_inode_operations;
200
201extern const struct inode_operations proc_pid_link_inode_operations;
202
203extern void proc_init_inodecache(void);
204void set_proc_pid_nlink(void);
205extern struct inode *proc_get_inode(struct super_block *, struct proc_dir_entry *);
206extern int proc_fill_super(struct super_block *, void *data, int flags);
207extern void proc_entry_rundown(struct proc_dir_entry *);
208
209/*
210 * proc_namespaces.c
211 */
212extern const struct inode_operations proc_ns_dir_inode_operations;
213extern const struct file_operations proc_ns_dir_operations;
214
215/*
216 * proc_net.c
217 */
218extern const struct file_operations proc_net_operations;
219extern const struct inode_operations proc_net_inode_operations;
220
221#ifdef CONFIG_NET
222extern int proc_net_init(void);
223#else
224static inline int proc_net_init(void) { return 0; }
225#endif
226
227/*
228 * proc_self.c
229 */
230extern int proc_setup_self(struct super_block *);
231
232/*
233 * proc_thread_self.c
234 */
235extern int proc_setup_thread_self(struct super_block *);
236extern void proc_thread_self_init(void);
237
238/*
239 * proc_sysctl.c
240 */
241#ifdef CONFIG_PROC_SYSCTL
242extern int proc_sys_init(void);
243extern void proc_sys_evict_inode(struct inode *inode,
244 struct ctl_table_header *head);
245#else
246static inline void proc_sys_init(void) { }
247static inline void proc_sys_evict_inode(struct inode *inode,
248 struct ctl_table_header *head) { }
249#endif
250
251/*
252 * proc_tty.c
253 */
254#ifdef CONFIG_TTY
255extern void proc_tty_init(void);
256#else
257static inline void proc_tty_init(void) {}
258#endif
259
260/*
261 * root.c
262 */
263extern struct proc_dir_entry proc_root;
264extern int proc_parse_options(char *options, struct pid_namespace *pid);
265
266extern void proc_self_init(void);
267extern int proc_remount(struct super_block *, int *, char *);
268
269/*
270 * task_[no]mmu.c
271 */
272struct proc_maps_private {
273 struct inode *inode;
274 struct task_struct *task;
275 struct mm_struct *mm;
276#ifdef CONFIG_MMU
277 struct vm_area_struct *tail_vma;
278#endif
279#ifdef CONFIG_NUMA
280 struct mempolicy *task_mempolicy;
281#endif
282} __randomize_layout;
283
284struct mm_struct *proc_mem_open(struct inode *inode, unsigned int mode);
285
286extern const struct file_operations proc_pid_maps_operations;
287extern const struct file_operations proc_tid_maps_operations;
288extern const struct file_operations proc_pid_numa_maps_operations;
289extern const struct file_operations proc_tid_numa_maps_operations;
290extern const struct file_operations proc_pid_smaps_operations;
291extern const struct file_operations proc_tid_smaps_operations;
292extern const struct file_operations proc_clear_refs_operations;
293extern const struct file_operations proc_pagemap_operations;
294
295extern unsigned long task_vsize(struct mm_struct *);
296extern unsigned long task_statm(struct mm_struct *,
297 unsigned long *, unsigned long *,
298 unsigned long *, unsigned long *);
299extern void task_mem(struct seq_file *, struct mm_struct *);