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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/refcount.h>
15#include <linux/spinlock.h>
16#include <linux/atomic.h>
17#include <linux/binfmts.h>
18#include <linux/sched/coredump.h>
19#include <linux/sched/task.h>
20
21struct ctl_table_header;
22struct mempolicy;
23
24/*
25 * This is not completely implemented yet. The idea is to
26 * create an in-memory tree (like the actual /proc filesystem
27 * tree) of these proc_dir_entries, so that we can dynamically
28 * add new files to /proc.
29 *
30 * parent/subdir are used for the directory structure (every /proc file has a
31 * parent, but "subdir" is empty for all non-directory entries).
32 * subdir_node is used to build the rb tree "subdir" of the parent.
33 */
34struct proc_dir_entry {
35 /*
36 * number of callers into module in progress;
37 * negative -> it's going away RSN
38 */
39 atomic_t in_use;
40 refcount_t refcnt;
41 struct list_head pde_openers; /* who did ->open, but not ->release */
42 /* protects ->pde_openers and all struct pde_opener instances */
43 spinlock_t pde_unload_lock;
44 struct completion *pde_unload_completion;
45 const struct inode_operations *proc_iops;
46 const struct file_operations *proc_fops;
47 const struct dentry_operations *proc_dops;
48 union {
49 const struct seq_operations *seq_ops;
50 int (*single_show)(struct seq_file *, void *);
51 };
52 proc_write_t write;
53 void *data;
54 unsigned int state_size;
55 unsigned int low_ino;
56 nlink_t nlink;
57 kuid_t uid;
58 kgid_t gid;
59 loff_t size;
60 struct proc_dir_entry *parent;
61 struct rb_root subdir;
62 struct rb_node subdir_node;
63 char *name;
64 umode_t mode;
65 u8 namelen;
66 char inline_name[];
67} __randomize_layout;
68
69#define SIZEOF_PDE ( \
70 sizeof(struct proc_dir_entry) < 128 ? 128 : \
71 sizeof(struct proc_dir_entry) < 192 ? 192 : \
72 sizeof(struct proc_dir_entry) < 256 ? 256 : \
73 sizeof(struct proc_dir_entry) < 512 ? 512 : \
74 0)
75#define SIZEOF_PDE_INLINE_NAME (SIZEOF_PDE - sizeof(struct proc_dir_entry))
76
77extern struct kmem_cache *proc_dir_entry_cache;
78void pde_free(struct proc_dir_entry *pde);
79
80union proc_op {
81 int (*proc_get_link)(struct dentry *, struct path *);
82 int (*proc_show)(struct seq_file *m,
83 struct pid_namespace *ns, struct pid *pid,
84 struct task_struct *task);
85 const char *lsm;
86};
87
88struct proc_inode {
89 struct pid *pid;
90 unsigned int fd;
91 union proc_op op;
92 struct proc_dir_entry *pde;
93 struct ctl_table_header *sysctl;
94 struct ctl_table *sysctl_entry;
95 struct hlist_node sysctl_inodes;
96 const struct proc_ns_operations *ns_ops;
97 struct inode vfs_inode;
98} __randomize_layout;
99
100/*
101 * General functions
102 */
103static inline struct proc_inode *PROC_I(const struct inode *inode)
104{
105 return container_of(inode, struct proc_inode, vfs_inode);
106}
107
108static inline struct proc_dir_entry *PDE(const struct inode *inode)
109{
110 return PROC_I(inode)->pde;
111}
112
113static inline void *__PDE_DATA(const struct inode *inode)
114{
115 return PDE(inode)->data;
116}
117
118static inline struct pid *proc_pid(const struct inode *inode)
119{
120 return PROC_I(inode)->pid;
121}
122
123static inline struct task_struct *get_proc_task(const struct inode *inode)
124{
125 return get_pid_task(proc_pid(inode), PIDTYPE_PID);
126}
127
128void task_dump_owner(struct task_struct *task, umode_t mode,
129 kuid_t *ruid, kgid_t *rgid);
130
131unsigned name_to_int(const struct qstr *qstr);
132/*
133 * Offset of the first process in the /proc root directory..
134 */
135#define FIRST_PROCESS_ENTRY 256
136
137/* Worst case buffer size needed for holding an integer. */
138#define PROC_NUMBUF 13
139
140/*
141 * array.c
142 */
143extern const struct file_operations proc_tid_children_operations;
144
145extern void proc_task_name(struct seq_file *m, struct task_struct *p,
146 bool escape);
147extern int proc_tid_stat(struct seq_file *, struct pid_namespace *,
148 struct pid *, struct task_struct *);
149extern int proc_tgid_stat(struct seq_file *, struct pid_namespace *,
150 struct pid *, struct task_struct *);
151extern int proc_pid_status(struct seq_file *, struct pid_namespace *,
152 struct pid *, struct task_struct *);
153extern int proc_pid_statm(struct seq_file *, struct pid_namespace *,
154 struct pid *, struct task_struct *);
155
156/*
157 * base.c
158 */
159extern const struct dentry_operations pid_dentry_operations;
160extern int pid_getattr(const struct path *, struct kstat *, u32, unsigned int);
161extern int proc_setattr(struct dentry *, struct iattr *);
162extern struct inode *proc_pid_make_inode(struct super_block *, struct task_struct *, umode_t);
163extern void pid_update_inode(struct task_struct *, struct inode *);
164extern int pid_delete_dentry(const struct dentry *);
165extern int proc_pid_readdir(struct file *, struct dir_context *);
166struct dentry *proc_pid_lookup(struct dentry *, unsigned int);
167extern loff_t mem_lseek(struct file *, loff_t, int);
168
169/* Lookups */
170typedef struct dentry *instantiate_t(struct dentry *,
171 struct task_struct *, const void *);
172bool proc_fill_cache(struct file *, struct dir_context *, const char *, unsigned int,
173 instantiate_t, struct task_struct *, const void *);
174
175/*
176 * generic.c
177 */
178struct proc_dir_entry *proc_create_reg(const char *name, umode_t mode,
179 struct proc_dir_entry **parent, void *data);
180struct proc_dir_entry *proc_register(struct proc_dir_entry *dir,
181 struct proc_dir_entry *dp);
182extern struct dentry *proc_lookup(struct inode *, struct dentry *, unsigned int);
183struct dentry *proc_lookup_de(struct inode *, struct dentry *, struct proc_dir_entry *);
184extern int proc_readdir(struct file *, struct dir_context *);
185int proc_readdir_de(struct file *, struct dir_context *, struct proc_dir_entry *);
186
187static inline struct proc_dir_entry *pde_get(struct proc_dir_entry *pde)
188{
189 refcount_inc(&pde->refcnt);
190 return pde;
191}
192extern void pde_put(struct proc_dir_entry *);
193
194static inline bool is_empty_pde(const struct proc_dir_entry *pde)
195{
196 return S_ISDIR(pde->mode) && !pde->proc_iops;
197}
198extern ssize_t proc_simple_write(struct file *, const char __user *, size_t, loff_t *);
199
200/*
201 * inode.c
202 */
203struct pde_opener {
204 struct file *file;
205 struct list_head lh;
206 bool closing;
207 struct completion *c;
208} __randomize_layout;
209extern const struct inode_operations proc_link_inode_operations;
210extern const struct inode_operations proc_pid_link_inode_operations;
211extern const struct super_operations proc_sops;
212
213void proc_init_kmemcache(void);
214void set_proc_pid_nlink(void);
215extern struct inode *proc_get_inode(struct super_block *, struct proc_dir_entry *);
216extern void proc_entry_rundown(struct proc_dir_entry *);
217
218/*
219 * proc_namespaces.c
220 */
221extern const struct inode_operations proc_ns_dir_inode_operations;
222extern const struct file_operations proc_ns_dir_operations;
223
224/*
225 * proc_net.c
226 */
227extern const struct file_operations proc_net_operations;
228extern const struct inode_operations proc_net_inode_operations;
229
230#ifdef CONFIG_NET
231extern int proc_net_init(void);
232#else
233static inline int proc_net_init(void) { return 0; }
234#endif
235
236/*
237 * proc_self.c
238 */
239extern int proc_setup_self(struct super_block *);
240
241/*
242 * proc_thread_self.c
243 */
244extern int proc_setup_thread_self(struct super_block *);
245extern void proc_thread_self_init(void);
246
247/*
248 * proc_sysctl.c
249 */
250#ifdef CONFIG_PROC_SYSCTL
251extern int proc_sys_init(void);
252extern void proc_sys_evict_inode(struct inode *inode,
253 struct ctl_table_header *head);
254#else
255static inline void proc_sys_init(void) { }
256static inline void proc_sys_evict_inode(struct inode *inode,
257 struct ctl_table_header *head) { }
258#endif
259
260/*
261 * proc_tty.c
262 */
263#ifdef CONFIG_TTY
264extern void proc_tty_init(void);
265#else
266static inline void proc_tty_init(void) {}
267#endif
268
269/*
270 * root.c
271 */
272extern struct proc_dir_entry proc_root;
273
274extern void proc_self_init(void);
275
276/*
277 * task_[no]mmu.c
278 */
279struct mem_size_stats;
280struct proc_maps_private {
281 struct inode *inode;
282 struct task_struct *task;
283 struct mm_struct *mm;
284#ifdef CONFIG_MMU
285 struct vm_area_struct *tail_vma;
286#endif
287#ifdef CONFIG_NUMA
288 struct mempolicy *task_mempolicy;
289#endif
290} __randomize_layout;
291
292struct mm_struct *proc_mem_open(struct inode *inode, unsigned int mode);
293
294extern const struct file_operations proc_pid_maps_operations;
295extern const struct file_operations proc_pid_numa_maps_operations;
296extern const struct file_operations proc_pid_smaps_operations;
297extern const struct file_operations proc_pid_smaps_rollup_operations;
298extern const struct file_operations proc_clear_refs_operations;
299extern const struct file_operations proc_pagemap_operations;
300
301extern unsigned long task_vsize(struct mm_struct *);
302extern unsigned long task_statm(struct mm_struct *,
303 unsigned long *, unsigned long *,
304 unsigned long *, unsigned long *);
305extern void task_mem(struct seq_file *, struct mm_struct *);