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21#ifndef _LINUX_SYSCTL_H
22#define _LINUX_SYSCTL_H
23
24#include <linux/list.h>
25#include <linux/rcupdate.h>
26#include <linux/wait.h>
27#include <linux/rbtree.h>
28#include <uapi/linux/sysctl.h>
29
30
31struct ctl_table;
32struct nsproxy;
33struct ctl_table_root;
34struct ctl_table_header;
35struct ctl_dir;
36
37typedef struct ctl_table ctl_table;
38
39typedef int proc_handler (struct ctl_table *ctl, int write,
40 void __user *buffer, size_t *lenp, loff_t *ppos);
41
42extern int proc_dostring(struct ctl_table *, int,
43 void __user *, size_t *, loff_t *);
44extern int proc_dointvec(struct ctl_table *, int,
45 void __user *, size_t *, loff_t *);
46extern int proc_dointvec_minmax(struct ctl_table *, int,
47 void __user *, size_t *, loff_t *);
48extern int proc_dointvec_jiffies(struct ctl_table *, int,
49 void __user *, size_t *, loff_t *);
50extern int proc_dointvec_userhz_jiffies(struct ctl_table *, int,
51 void __user *, size_t *, loff_t *);
52extern int proc_dointvec_ms_jiffies(struct ctl_table *, int,
53 void __user *, size_t *, loff_t *);
54extern int proc_doulongvec_minmax(struct ctl_table *, int,
55 void __user *, size_t *, loff_t *);
56extern int proc_doulongvec_ms_jiffies_minmax(struct ctl_table *table, int,
57 void __user *, size_t *, loff_t *);
58extern int proc_do_large_bitmap(struct ctl_table *, int,
59 void __user *, size_t *, loff_t *);
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89struct ctl_table_poll {
90 atomic_t event;
91 wait_queue_head_t wait;
92};
93
94static inline void *proc_sys_poll_event(struct ctl_table_poll *poll)
95{
96 return (void *)(unsigned long)atomic_read(&poll->event);
97}
98
99#define __CTL_TABLE_POLL_INITIALIZER(name) { \
100 .event = ATOMIC_INIT(0), \
101 .wait = __WAIT_QUEUE_HEAD_INITIALIZER(name.wait) }
102
103#define DEFINE_CTL_TABLE_POLL(name) \
104 struct ctl_table_poll name = __CTL_TABLE_POLL_INITIALIZER(name)
105
106
107struct ctl_table
108{
109 const char *procname;
110 void *data;
111 int maxlen;
112 umode_t mode;
113 struct ctl_table *child;
114 proc_handler *proc_handler;
115 struct ctl_table_poll *poll;
116 void *extra1;
117 void *extra2;
118};
119
120struct ctl_node {
121 struct rb_node node;
122 struct ctl_table_header *header;
123};
124
125
126
127struct ctl_table_header
128{
129 union {
130 struct {
131 struct ctl_table *ctl_table;
132 int used;
133 int count;
134 int nreg;
135 };
136 struct rcu_head rcu;
137 };
138 struct completion *unregistering;
139 struct ctl_table *ctl_table_arg;
140 struct ctl_table_root *root;
141 struct ctl_table_set *set;
142 struct ctl_dir *parent;
143 struct ctl_node *node;
144};
145
146struct ctl_dir {
147
148 struct ctl_table_header header;
149 struct rb_root root;
150};
151
152struct ctl_table_set {
153 int (*is_seen)(struct ctl_table_set *);
154 struct ctl_dir dir;
155};
156
157struct ctl_table_root {
158 struct ctl_table_set default_set;
159 struct ctl_table_set *(*lookup)(struct ctl_table_root *root,
160 struct nsproxy *namespaces);
161 int (*permissions)(struct ctl_table_header *head, struct ctl_table *table);
162};
163
164
165struct ctl_path {
166 const char *procname;
167};
168
169#ifdef CONFIG_SYSCTL
170
171void proc_sys_poll_notify(struct ctl_table_poll *poll);
172
173extern void setup_sysctl_set(struct ctl_table_set *p,
174 struct ctl_table_root *root,
175 int (*is_seen)(struct ctl_table_set *));
176extern void retire_sysctl_set(struct ctl_table_set *set);
177
178void register_sysctl_root(struct ctl_table_root *root);
179struct ctl_table_header *__register_sysctl_table(
180 struct ctl_table_set *set,
181 const char *path, struct ctl_table *table);
182struct ctl_table_header *__register_sysctl_paths(
183 struct ctl_table_set *set,
184 const struct ctl_path *path, struct ctl_table *table);
185struct ctl_table_header *register_sysctl(const char *path, struct ctl_table *table);
186struct ctl_table_header *register_sysctl_table(struct ctl_table * table);
187struct ctl_table_header *register_sysctl_paths(const struct ctl_path *path,
188 struct ctl_table *table);
189
190void unregister_sysctl_table(struct ctl_table_header * table);
191
192extern int sysctl_init(void);
193#else
194static inline struct ctl_table_header *register_sysctl_table(struct ctl_table * table)
195{
196 return NULL;
197}
198
199static inline struct ctl_table_header *register_sysctl_paths(
200 const struct ctl_path *path, struct ctl_table *table)
201{
202 return NULL;
203}
204
205static inline void unregister_sysctl_table(struct ctl_table_header * table)
206{
207}
208
209static inline void setup_sysctl_set(struct ctl_table_set *p,
210 struct ctl_table_root *root,
211 int (*is_seen)(struct ctl_table_set *))
212{
213}
214
215#endif
216
217#endif
218