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22#ifndef _LINUX_SYSCTL_H
23#define _LINUX_SYSCTL_H
24
25#include <linux/list.h>
26#include <linux/rcupdate.h>
27#include <linux/wait.h>
28#include <linux/rbtree.h>
29#include <linux/uidgid.h>
30#include <uapi/linux/sysctl.h>
31
32
33struct completion;
34struct ctl_table;
35struct nsproxy;
36struct ctl_table_root;
37struct ctl_table_header;
38struct ctl_dir;
39
40typedef int proc_handler (struct ctl_table *ctl, int write,
41 void __user *buffer, size_t *lenp, loff_t *ppos);
42
43extern int proc_dostring(struct ctl_table *, int,
44 void __user *, size_t *, loff_t *);
45extern int proc_dointvec(struct ctl_table *, int,
46 void __user *, size_t *, loff_t *);
47extern int proc_douintvec(struct ctl_table *, int,
48 void __user *, size_t *, loff_t *);
49extern int proc_dointvec_minmax(struct ctl_table *, int,
50 void __user *, size_t *, loff_t *);
51extern int proc_douintvec_minmax(struct ctl_table *table, int write,
52 void __user *buffer, size_t *lenp,
53 loff_t *ppos);
54extern int proc_dointvec_jiffies(struct ctl_table *, int,
55 void __user *, size_t *, loff_t *);
56extern int proc_dointvec_userhz_jiffies(struct ctl_table *, int,
57 void __user *, size_t *, loff_t *);
58extern int proc_dointvec_ms_jiffies(struct ctl_table *, int,
59 void __user *, size_t *, loff_t *);
60extern int proc_doulongvec_minmax(struct ctl_table *, int,
61 void __user *, size_t *, loff_t *);
62extern int proc_doulongvec_ms_jiffies_minmax(struct ctl_table *table, int,
63 void __user *, size_t *, loff_t *);
64extern int proc_do_large_bitmap(struct ctl_table *, int,
65 void __user *, size_t *, loff_t *);
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95struct ctl_table_poll {
96 atomic_t event;
97 wait_queue_head_t wait;
98};
99
100static inline void *proc_sys_poll_event(struct ctl_table_poll *poll)
101{
102 return (void *)(unsigned long)atomic_read(&poll->event);
103}
104
105#define __CTL_TABLE_POLL_INITIALIZER(name) { \
106 .event = ATOMIC_INIT(0), \
107 .wait = __WAIT_QUEUE_HEAD_INITIALIZER(name.wait) }
108
109#define DEFINE_CTL_TABLE_POLL(name) \
110 struct ctl_table_poll name = __CTL_TABLE_POLL_INITIALIZER(name)
111
112
113struct ctl_table
114{
115 const char *procname;
116 void *data;
117 int maxlen;
118 umode_t mode;
119 struct ctl_table *child;
120 proc_handler *proc_handler;
121 struct ctl_table_poll *poll;
122 void *extra1;
123 void *extra2;
124} __randomize_layout;
125
126struct ctl_node {
127 struct rb_node node;
128 struct ctl_table_header *header;
129};
130
131
132
133struct ctl_table_header
134{
135 union {
136 struct {
137 struct ctl_table *ctl_table;
138 int used;
139 int count;
140 int nreg;
141 };
142 struct rcu_head rcu;
143 };
144 struct completion *unregistering;
145 struct ctl_table *ctl_table_arg;
146 struct ctl_table_root *root;
147 struct ctl_table_set *set;
148 struct ctl_dir *parent;
149 struct ctl_node *node;
150 struct hlist_head inodes;
151};
152
153struct ctl_dir {
154
155 struct ctl_table_header header;
156 struct rb_root root;
157};
158
159struct ctl_table_set {
160 int (*is_seen)(struct ctl_table_set *);
161 struct ctl_dir dir;
162};
163
164struct ctl_table_root {
165 struct ctl_table_set default_set;
166 struct ctl_table_set *(*lookup)(struct ctl_table_root *root);
167 void (*set_ownership)(struct ctl_table_header *head,
168 struct ctl_table *table,
169 kuid_t *uid, kgid_t *gid);
170 int (*permissions)(struct ctl_table_header *head, struct ctl_table *table);
171};
172
173
174struct ctl_path {
175 const char *procname;
176};
177
178#ifdef CONFIG_SYSCTL
179
180void proc_sys_poll_notify(struct ctl_table_poll *poll);
181
182extern void setup_sysctl_set(struct ctl_table_set *p,
183 struct ctl_table_root *root,
184 int (*is_seen)(struct ctl_table_set *));
185extern void retire_sysctl_set(struct ctl_table_set *set);
186
187struct ctl_table_header *__register_sysctl_table(
188 struct ctl_table_set *set,
189 const char *path, struct ctl_table *table);
190struct ctl_table_header *__register_sysctl_paths(
191 struct ctl_table_set *set,
192 const struct ctl_path *path, struct ctl_table *table);
193struct ctl_table_header *register_sysctl(const char *path, struct ctl_table *table);
194struct ctl_table_header *register_sysctl_table(struct ctl_table * table);
195struct ctl_table_header *register_sysctl_paths(const struct ctl_path *path,
196 struct ctl_table *table);
197
198void unregister_sysctl_table(struct ctl_table_header * table);
199
200extern int sysctl_init(void);
201
202extern struct ctl_table sysctl_mount_point[];
203
204#else
205static inline struct ctl_table_header *register_sysctl_table(struct ctl_table * table)
206{
207 return NULL;
208}
209
210static inline struct ctl_table_header *register_sysctl_paths(
211 const struct ctl_path *path, struct ctl_table *table)
212{
213 return NULL;
214}
215
216static inline struct ctl_table_header *register_sysctl(const char *path, struct ctl_table *table)
217{
218 return NULL;
219}
220
221static inline void unregister_sysctl_table(struct ctl_table_header * table)
222{
223}
224
225static inline void setup_sysctl_set(struct ctl_table_set *p,
226 struct ctl_table_root *root,
227 int (*is_seen)(struct ctl_table_set *))
228{
229}
230
231#endif
232
233int sysctl_max_threads(struct ctl_table *table, int write,
234 void __user *buffer, size_t *lenp, loff_t *ppos);
235
236#endif
237