| /* SPDX-License-Identifier: GPL-2.0 */ |
| /* |
| * sysctl.h: General linux system control interface |
| * |
| * Begun 24 March 1995, Stephen Tweedie |
| * |
| **************************************************************** |
| **************************************************************** |
| ** |
| ** WARNING: |
| ** The values in this file are exported to user space via |
| ** the sysctl() binary interface. Do *NOT* change the |
| ** numbering of any existing values here, and do not change |
| ** any numbers within any one set of values. If you have to |
| ** redefine an existing interface, use a new number for it. |
| ** The kernel will then return -ENOTDIR to any application using |
| ** the old binary interface. |
| ** |
| **************************************************************** |
| **************************************************************** |
| */ |
| #ifndef _LINUX_SYSCTL_H |
| #define _LINUX_SYSCTL_H |
| |
| #include <linux/list.h> |
| #include <linux/rcupdate.h> |
| #include <linux/wait.h> |
| #include <linux/rbtree.h> |
| #include <linux/uidgid.h> |
| #include <uapi/linux/sysctl.h> |
| |
| /* For the /proc/sys support */ |
| struct completion; |
| struct ctl_table; |
| struct nsproxy; |
| struct ctl_table_root; |
| struct ctl_table_header; |
| struct ctl_dir; |
| |
| /* Keep the same order as in fs/proc/proc_sysctl.c */ |
| #define SYSCTL_ZERO ((void *)&sysctl_vals[0]) |
| #define SYSCTL_ONE ((void *)&sysctl_vals[1]) |
| #define SYSCTL_INT_MAX ((void *)&sysctl_vals[2]) |
| |
| extern const int sysctl_vals[]; |
| |
| typedef int proc_handler(struct ctl_table *ctl, int write, void *buffer, |
| size_t *lenp, loff_t *ppos); |
| |
| int proc_dostring(struct ctl_table *, int, void *, size_t *, loff_t *); |
| int proc_dointvec(struct ctl_table *, int, void *, size_t *, loff_t *); |
| int proc_douintvec(struct ctl_table *, int, void *, size_t *, loff_t *); |
| int proc_dointvec_minmax(struct ctl_table *, int, void *, size_t *, loff_t *); |
| int proc_douintvec_minmax(struct ctl_table *table, int write, void *buffer, |
| size_t *lenp, loff_t *ppos); |
| int proc_dointvec_jiffies(struct ctl_table *, int, void *, size_t *, loff_t *); |
| int proc_dointvec_userhz_jiffies(struct ctl_table *, int, void *, size_t *, |
| loff_t *); |
| int proc_dointvec_ms_jiffies(struct ctl_table *, int, void *, size_t *, |
| loff_t *); |
| int proc_doulongvec_minmax(struct ctl_table *, int, void *, size_t *, loff_t *); |
| int proc_doulongvec_ms_jiffies_minmax(struct ctl_table *table, int, void *, |
| size_t *, loff_t *); |
| int proc_do_large_bitmap(struct ctl_table *, int, void *, size_t *, loff_t *); |
| int proc_do_static_key(struct ctl_table *table, int write, void *buffer, |
| size_t *lenp, loff_t *ppos); |
| |
| /* |
| * Register a set of sysctl names by calling register_sysctl_table |
| * with an initialised array of struct ctl_table's. An entry with |
| * NULL procname terminates the table. table->de will be |
| * set up by the registration and need not be initialised in advance. |
| * |
| * sysctl names can be mirrored automatically under /proc/sys. The |
| * procname supplied controls /proc naming. |
| * |
| * The table's mode will be honoured for proc-fs access. |
| * |
| * Leaf nodes in the sysctl tree will be represented by a single file |
| * under /proc; non-leaf nodes will be represented by directories. A |
| * null procname disables /proc mirroring at this node. |
| * |
| * The data and maxlen fields of the ctl_table |
| * struct enable minimal validation of the values being written to be |
| * performed, and the mode field allows minimal authentication. |
| * |
| * There must be a proc_handler routine for any terminal nodes |
| * mirrored under /proc/sys (non-terminals are handled by a built-in |
| * directory handler). Several default handlers are available to |
| * cover common cases. |
| */ |
| |
| /* Support for userspace poll() to watch for changes */ |
| struct ctl_table_poll { |
| atomic_t event; |
| wait_queue_head_t wait; |
| }; |
| |
| static inline void *proc_sys_poll_event(struct ctl_table_poll *poll) |
| { |
| return (void *)(unsigned long)atomic_read(&poll->event); |
| } |
| |
| #define __CTL_TABLE_POLL_INITIALIZER(name) { \ |
| .event = ATOMIC_INIT(0), \ |
| .wait = __WAIT_QUEUE_HEAD_INITIALIZER(name.wait) } |
| |
| #define DEFINE_CTL_TABLE_POLL(name) \ |
| struct ctl_table_poll name = __CTL_TABLE_POLL_INITIALIZER(name) |
| |
| /* A sysctl table is an array of struct ctl_table: */ |
| struct ctl_table { |
| const char *procname; /* Text ID for /proc/sys, or zero */ |
| void *data; |
| int maxlen; |
| umode_t mode; |
| struct ctl_table *child; /* Deprecated */ |
| proc_handler *proc_handler; /* Callback for text formatting */ |
| struct ctl_table_poll *poll; |
| void *extra1; |
| void *extra2; |
| } __randomize_layout; |
| |
| struct ctl_node { |
| struct rb_node node; |
| struct ctl_table_header *header; |
| }; |
| |
| /* struct ctl_table_header is used to maintain dynamic lists of |
| struct ctl_table trees. */ |
| struct ctl_table_header { |
| union { |
| struct { |
| struct ctl_table *ctl_table; |
| int used; |
| int count; |
| int nreg; |
| }; |
| struct rcu_head rcu; |
| }; |
| struct completion *unregistering; |
| struct ctl_table *ctl_table_arg; |
| struct ctl_table_root *root; |
| struct ctl_table_set *set; |
| struct ctl_dir *parent; |
| struct ctl_node *node; |
| struct hlist_head inodes; /* head for proc_inode->sysctl_inodes */ |
| }; |
| |
| struct ctl_dir { |
| /* Header must be at the start of ctl_dir */ |
| struct ctl_table_header header; |
| struct rb_root root; |
| }; |
| |
| struct ctl_table_set { |
| int (*is_seen)(struct ctl_table_set *); |
| struct ctl_dir dir; |
| }; |
| |
| struct ctl_table_root { |
| struct ctl_table_set default_set; |
| struct ctl_table_set *(*lookup)(struct ctl_table_root *root); |
| void (*set_ownership)(struct ctl_table_header *head, |
| struct ctl_table *table, |
| kuid_t *uid, kgid_t *gid); |
| int (*permissions)(struct ctl_table_header *head, struct ctl_table *table); |
| }; |
| |
| /* struct ctl_path describes where in the hierarchy a table is added */ |
| struct ctl_path { |
| const char *procname; |
| }; |
| |
| #ifdef CONFIG_SYSCTL |
| |
| void proc_sys_poll_notify(struct ctl_table_poll *poll); |
| |
| extern void setup_sysctl_set(struct ctl_table_set *p, |
| struct ctl_table_root *root, |
| int (*is_seen)(struct ctl_table_set *)); |
| extern void retire_sysctl_set(struct ctl_table_set *set); |
| |
| struct ctl_table_header *__register_sysctl_table( |
| struct ctl_table_set *set, |
| const char *path, struct ctl_table *table); |
| struct ctl_table_header *__register_sysctl_paths( |
| struct ctl_table_set *set, |
| const struct ctl_path *path, struct ctl_table *table); |
| struct ctl_table_header *register_sysctl(const char *path, struct ctl_table *table); |
| struct ctl_table_header *register_sysctl_table(struct ctl_table * table); |
| struct ctl_table_header *register_sysctl_paths(const struct ctl_path *path, |
| struct ctl_table *table); |
| |
| void unregister_sysctl_table(struct ctl_table_header * table); |
| |
| extern int sysctl_init(void); |
| void do_sysctl_args(void); |
| |
| extern int pwrsw_enabled; |
| extern int unaligned_enabled; |
| extern int unaligned_dump_stack; |
| extern int no_unaligned_warning; |
| |
| extern struct ctl_table sysctl_mount_point[]; |
| extern struct ctl_table random_table[]; |
| extern struct ctl_table firmware_config_table[]; |
| extern struct ctl_table epoll_table[]; |
| |
| #else /* CONFIG_SYSCTL */ |
| static inline struct ctl_table_header *register_sysctl_table(struct ctl_table * table) |
| { |
| return NULL; |
| } |
| |
| static inline struct ctl_table_header *register_sysctl_paths( |
| const struct ctl_path *path, struct ctl_table *table) |
| { |
| return NULL; |
| } |
| |
| static inline struct ctl_table_header *register_sysctl(const char *path, struct ctl_table *table) |
| { |
| return NULL; |
| } |
| |
| static inline void unregister_sysctl_table(struct ctl_table_header * table) |
| { |
| } |
| |
| static inline void setup_sysctl_set(struct ctl_table_set *p, |
| struct ctl_table_root *root, |
| int (*is_seen)(struct ctl_table_set *)) |
| { |
| } |
| |
| static inline void do_sysctl_args(void) |
| { |
| } |
| #endif /* CONFIG_SYSCTL */ |
| |
| int sysctl_max_threads(struct ctl_table *table, int write, void *buffer, |
| size_t *lenp, loff_t *ppos); |
| |
| #endif /* _LINUX_SYSCTL_H */ |