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Linux/include/linux/sysctl.h

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  1 /* SPDX-License-Identifier: GPL-2.0 */
  2 /*
  3  * sysctl.h: General linux system control interface
  4  *
  5  * Begun 24 March 1995, Stephen Tweedie
  6  *
  7  ****************************************************************
  8  ****************************************************************
  9  **
 10  **  WARNING:
 11  **  The values in this file are exported to user space via 
 12  **  the sysctl() binary interface.  Do *NOT* change the
 13  **  numbering of any existing values here, and do not change
 14  **  any numbers within any one set of values.  If you have to
 15  **  redefine an existing interface, use a new number for it.
 16  **  The kernel will then return -ENOTDIR to any application using
 17  **  the old binary interface.
 18  **
 19  ****************************************************************
 20  ****************************************************************
 21  */
 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 /* For the /proc/sys support */
 33 struct completion;
 34 struct ctl_table;
 35 struct nsproxy;
 36 struct ctl_table_root;
 37 struct ctl_table_header;
 38 struct ctl_dir;
 39 
 40 typedef int proc_handler (struct ctl_table *ctl, int write,
 41                           void __user *buffer, size_t *lenp, loff_t *ppos);
 42 
 43 extern int proc_dostring(struct ctl_table *, int,
 44                          void __user *, size_t *, loff_t *);
 45 extern int proc_dointvec(struct ctl_table *, int,
 46                          void __user *, size_t *, loff_t *);
 47 extern int proc_douintvec(struct ctl_table *, int,
 48                          void __user *, size_t *, loff_t *);
 49 extern int proc_dointvec_minmax(struct ctl_table *, int,
 50                                 void __user *, size_t *, loff_t *);
 51 extern int proc_douintvec_minmax(struct ctl_table *table, int write,
 52                                  void __user *buffer, size_t *lenp,
 53                                  loff_t *ppos);
 54 extern int proc_dopipe_max_size(struct ctl_table *table, int write,
 55                                 void __user *buffer, size_t *lenp,
 56                                 loff_t *ppos);
 57 extern int proc_dointvec_jiffies(struct ctl_table *, int,
 58                                  void __user *, size_t *, loff_t *);
 59 extern int proc_dointvec_userhz_jiffies(struct ctl_table *, int,
 60                                         void __user *, size_t *, loff_t *);
 61 extern int proc_dointvec_ms_jiffies(struct ctl_table *, int,
 62                                     void __user *, size_t *, loff_t *);
 63 extern int proc_doulongvec_minmax(struct ctl_table *, int,
 64                                   void __user *, size_t *, loff_t *);
 65 extern int proc_doulongvec_ms_jiffies_minmax(struct ctl_table *table, int,
 66                                       void __user *, size_t *, loff_t *);
 67 extern int proc_do_large_bitmap(struct ctl_table *, int,
 68                                 void __user *, size_t *, loff_t *);
 69 
 70 /*
 71  * Register a set of sysctl names by calling register_sysctl_table
 72  * with an initialised array of struct ctl_table's.  An entry with 
 73  * NULL procname terminates the table.  table->de will be
 74  * set up by the registration and need not be initialised in advance.
 75  *
 76  * sysctl names can be mirrored automatically under /proc/sys.  The
 77  * procname supplied controls /proc naming.
 78  *
 79  * The table's mode will be honoured both for sys_sysctl(2) and
 80  * proc-fs access.
 81  *
 82  * Leaf nodes in the sysctl tree will be represented by a single file
 83  * under /proc; non-leaf nodes will be represented by directories.  A
 84  * null procname disables /proc mirroring at this node.
 85  *
 86  * sysctl(2) can automatically manage read and write requests through
 87  * the sysctl table.  The data and maxlen fields of the ctl_table
 88  * struct enable minimal validation of the values being written to be
 89  * performed, and the mode field allows minimal authentication.
 90  * 
 91  * There must be a proc_handler routine for any terminal nodes
 92  * mirrored under /proc/sys (non-terminals are handled by a built-in
 93  * directory handler).  Several default handlers are available to
 94  * cover common cases.
 95  */
 96 
 97 /* Support for userspace poll() to watch for changes */
 98 struct ctl_table_poll {
 99         atomic_t event;
100         wait_queue_head_t wait;
101 };
102 
103 static inline void *proc_sys_poll_event(struct ctl_table_poll *poll)
104 {
105         return (void *)(unsigned long)atomic_read(&poll->event);
106 }
107 
108 #define __CTL_TABLE_POLL_INITIALIZER(name) {                            \
109         .event = ATOMIC_INIT(0),                                        \
110         .wait = __WAIT_QUEUE_HEAD_INITIALIZER(name.wait) }
111 
112 #define DEFINE_CTL_TABLE_POLL(name)                                     \
113         struct ctl_table_poll name = __CTL_TABLE_POLL_INITIALIZER(name)
114 
115 /* A sysctl table is an array of struct ctl_table: */
116 struct ctl_table 
117 {
118         const char *procname;           /* Text ID for /proc/sys, or zero */
119         void *data;
120         int maxlen;
121         umode_t mode;
122         struct ctl_table *child;        /* Deprecated */
123         proc_handler *proc_handler;     /* Callback for text formatting */
124         struct ctl_table_poll *poll;
125         void *extra1;
126         void *extra2;
127 } __randomize_layout;
128 
129 struct ctl_node {
130         struct rb_node node;
131         struct ctl_table_header *header;
132 };
133 
134 /* struct ctl_table_header is used to maintain dynamic lists of
135    struct ctl_table trees. */
136 struct ctl_table_header
137 {
138         union {
139                 struct {
140                         struct ctl_table *ctl_table;
141                         int used;
142                         int count;
143                         int nreg;
144                 };
145                 struct rcu_head rcu;
146         };
147         struct completion *unregistering;
148         struct ctl_table *ctl_table_arg;
149         struct ctl_table_root *root;
150         struct ctl_table_set *set;
151         struct ctl_dir *parent;
152         struct ctl_node *node;
153         struct hlist_head inodes; /* head for proc_inode->sysctl_inodes */
154 };
155 
156 struct ctl_dir {
157         /* Header must be at the start of ctl_dir */
158         struct ctl_table_header header;
159         struct rb_root root;
160 };
161 
162 struct ctl_table_set {
163         int (*is_seen)(struct ctl_table_set *);
164         struct ctl_dir dir;
165 };
166 
167 struct ctl_table_root {
168         struct ctl_table_set default_set;
169         struct ctl_table_set *(*lookup)(struct ctl_table_root *root);
170         void (*set_ownership)(struct ctl_table_header *head,
171                               struct ctl_table *table,
172                               kuid_t *uid, kgid_t *gid);
173         int (*permissions)(struct ctl_table_header *head, struct ctl_table *table);
174 };
175 
176 /* struct ctl_path describes where in the hierarchy a table is added */
177 struct ctl_path {
178         const char *procname;
179 };
180 
181 #ifdef CONFIG_SYSCTL
182 
183 void proc_sys_poll_notify(struct ctl_table_poll *poll);
184 
185 extern void setup_sysctl_set(struct ctl_table_set *p,
186         struct ctl_table_root *root,
187         int (*is_seen)(struct ctl_table_set *));
188 extern void retire_sysctl_set(struct ctl_table_set *set);
189 
190 struct ctl_table_header *__register_sysctl_table(
191         struct ctl_table_set *set,
192         const char *path, struct ctl_table *table);
193 struct ctl_table_header *__register_sysctl_paths(
194         struct ctl_table_set *set,
195         const struct ctl_path *path, struct ctl_table *table);
196 struct ctl_table_header *register_sysctl(const char *path, struct ctl_table *table);
197 struct ctl_table_header *register_sysctl_table(struct ctl_table * table);
198 struct ctl_table_header *register_sysctl_paths(const struct ctl_path *path,
199                                                 struct ctl_table *table);
200 
201 void unregister_sysctl_table(struct ctl_table_header * table);
202 
203 extern int sysctl_init(void);
204 
205 extern struct ctl_table sysctl_mount_point[];
206 
207 #else /* CONFIG_SYSCTL */
208 static inline struct ctl_table_header *register_sysctl_table(struct ctl_table * table)
209 {
210         return NULL;
211 }
212 
213 static inline struct ctl_table_header *register_sysctl_paths(
214                         const struct ctl_path *path, struct ctl_table *table)
215 {
216         return NULL;
217 }
218 
219 static inline struct ctl_table_header *register_sysctl(const char *path, struct ctl_table *table)
220 {
221         return NULL;
222 }
223 
224 static inline void unregister_sysctl_table(struct ctl_table_header * table)
225 {
226 }
227 
228 static inline void setup_sysctl_set(struct ctl_table_set *p,
229         struct ctl_table_root *root,
230         int (*is_seen)(struct ctl_table_set *))
231 {
232 }
233 
234 #endif /* CONFIG_SYSCTL */
235 
236 int sysctl_max_threads(struct ctl_table *table, int write,
237                        void __user *buffer, size_t *lenp, loff_t *ppos);
238 
239 #endif /* _LINUX_SYSCTL_H */
240 

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