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309 lines
9.7 KiB
309 lines
9.7 KiB
/* SPDX-License-Identifier: GPL-2.0 */ |
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/* |
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* sysctl.h: General linux system control interface |
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* |
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* Begun 24 March 1995, Stephen Tweedie |
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* |
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**************************************************************** |
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**************************************************************** |
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** |
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** WARNING: |
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** The values in this file are exported to user space via |
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** the sysctl() binary interface. Do *NOT* change the |
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** numbering of any existing values here, and do not change |
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** any numbers within any one set of values. If you have to |
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** redefine an existing interface, use a new number for it. |
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** The kernel will then return -ENOTDIR to any application using |
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** the old binary interface. |
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** |
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**************************************************************** |
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**************************************************************** |
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*/ |
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#ifndef _LINUX_SYSCTL_H |
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#define _LINUX_SYSCTL_H |
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#include <linux/list.h> |
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#include <linux/rcupdate.h> |
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#include <linux/wait.h> |
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#include <linux/rbtree.h> |
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#include <linux/uidgid.h> |
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#include <uapi/linux/sysctl.h> |
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/* For the /proc/sys support */ |
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struct completion; |
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struct ctl_table; |
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struct nsproxy; |
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struct ctl_table_root; |
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struct ctl_table_header; |
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struct ctl_dir; |
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/* Keep the same order as in fs/proc/proc_sysctl.c */ |
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#define SYSCTL_ZERO ((void *)&sysctl_vals[0]) |
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#define SYSCTL_ONE ((void *)&sysctl_vals[1]) |
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#define SYSCTL_TWO ((void *)&sysctl_vals[2]) |
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#define SYSCTL_THREE ((void *)&sysctl_vals[3]) |
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#define SYSCTL_FOUR ((void *)&sysctl_vals[4]) |
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#define SYSCTL_ONE_HUNDRED ((void *)&sysctl_vals[5]) |
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#define SYSCTL_TWO_HUNDRED ((void *)&sysctl_vals[6]) |
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#define SYSCTL_ONE_THOUSAND ((void *)&sysctl_vals[7]) |
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#define SYSCTL_THREE_THOUSAND ((void *)&sysctl_vals[8]) |
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#define SYSCTL_INT_MAX ((void *)&sysctl_vals[9]) |
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/* this is needed for the proc_dointvec_minmax for [fs_]overflow UID and GID */ |
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#define SYSCTL_MAXOLDUID ((void *)&sysctl_vals[10]) |
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#define SYSCTL_NEG_ONE ((void *)&sysctl_vals[11]) |
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extern const int sysctl_vals[]; |
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#define SYSCTL_LONG_ZERO ((void *)&sysctl_long_vals[0]) |
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#define SYSCTL_LONG_ONE ((void *)&sysctl_long_vals[1]) |
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#define SYSCTL_LONG_MAX ((void *)&sysctl_long_vals[2]) |
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extern const unsigned long sysctl_long_vals[]; |
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typedef int proc_handler(struct ctl_table *ctl, int write, void *buffer, |
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size_t *lenp, loff_t *ppos); |
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int proc_dostring(struct ctl_table *, int, void *, size_t *, loff_t *); |
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int proc_dobool(struct ctl_table *table, int write, void *buffer, |
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size_t *lenp, loff_t *ppos); |
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int proc_dointvec(struct ctl_table *, int, void *, size_t *, loff_t *); |
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int proc_douintvec(struct ctl_table *, int, void *, size_t *, loff_t *); |
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int proc_dointvec_minmax(struct ctl_table *, int, void *, size_t *, loff_t *); |
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int proc_douintvec_minmax(struct ctl_table *table, int write, void *buffer, |
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size_t *lenp, loff_t *ppos); |
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int proc_dou8vec_minmax(struct ctl_table *table, int write, void *buffer, |
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size_t *lenp, loff_t *ppos); |
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int proc_dointvec_jiffies(struct ctl_table *, int, void *, size_t *, loff_t *); |
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int proc_dointvec_ms_jiffies_minmax(struct ctl_table *table, int write, |
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void *buffer, size_t *lenp, loff_t *ppos); |
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int proc_dointvec_userhz_jiffies(struct ctl_table *, int, void *, size_t *, |
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loff_t *); |
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int proc_dointvec_ms_jiffies(struct ctl_table *, int, void *, size_t *, |
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loff_t *); |
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int proc_doulongvec_minmax(struct ctl_table *, int, void *, size_t *, loff_t *); |
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int proc_doulongvec_ms_jiffies_minmax(struct ctl_table *table, int, void *, |
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size_t *, loff_t *); |
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int proc_do_large_bitmap(struct ctl_table *, int, void *, size_t *, loff_t *); |
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int proc_do_static_key(struct ctl_table *table, int write, void *buffer, |
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size_t *lenp, loff_t *ppos); |
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/* |
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* Register a set of sysctl names by calling register_sysctl_table |
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* with an initialised array of struct ctl_table's. An entry with |
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* NULL procname terminates the table. table->de will be |
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* set up by the registration and need not be initialised in advance. |
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* |
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* sysctl names can be mirrored automatically under /proc/sys. The |
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* procname supplied controls /proc naming. |
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* |
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* The table's mode will be honoured for proc-fs access. |
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* |
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* Leaf nodes in the sysctl tree will be represented by a single file |
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* under /proc; non-leaf nodes will be represented by directories. A |
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* null procname disables /proc mirroring at this node. |
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* |
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* The data and maxlen fields of the ctl_table |
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* struct enable minimal validation of the values being written to be |
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* performed, and the mode field allows minimal authentication. |
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* |
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* There must be a proc_handler routine for any terminal nodes |
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* mirrored under /proc/sys (non-terminals are handled by a built-in |
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* directory handler). Several default handlers are available to |
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* cover common cases. |
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*/ |
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/* Support for userspace poll() to watch for changes */ |
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struct ctl_table_poll { |
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atomic_t event; |
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wait_queue_head_t wait; |
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}; |
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static inline void *proc_sys_poll_event(struct ctl_table_poll *poll) |
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{ |
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return (void *)(unsigned long)atomic_read(&poll->event); |
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} |
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#define __CTL_TABLE_POLL_INITIALIZER(name) { \ |
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.event = ATOMIC_INIT(0), \ |
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.wait = __WAIT_QUEUE_HEAD_INITIALIZER(name.wait) } |
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#define DEFINE_CTL_TABLE_POLL(name) \ |
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struct ctl_table_poll name = __CTL_TABLE_POLL_INITIALIZER(name) |
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/* A sysctl table is an array of struct ctl_table: */ |
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struct ctl_table { |
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const char *procname; /* Text ID for /proc/sys, or zero */ |
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void *data; |
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int maxlen; |
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umode_t mode; |
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struct ctl_table *child; /* Deprecated */ |
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proc_handler *proc_handler; /* Callback for text formatting */ |
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struct ctl_table_poll *poll; |
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void *extra1; |
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void *extra2; |
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} __randomize_layout; |
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struct ctl_node { |
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struct rb_node node; |
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struct ctl_table_header *header; |
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}; |
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/* struct ctl_table_header is used to maintain dynamic lists of |
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struct ctl_table trees. */ |
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struct ctl_table_header { |
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union { |
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struct { |
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struct ctl_table *ctl_table; |
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int used; |
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int count; |
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int nreg; |
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}; |
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struct rcu_head rcu; |
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}; |
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struct completion *unregistering; |
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struct ctl_table *ctl_table_arg; |
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struct ctl_table_root *root; |
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struct ctl_table_set *set; |
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struct ctl_dir *parent; |
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struct ctl_node *node; |
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struct hlist_head inodes; /* head for proc_inode->sysctl_inodes */ |
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}; |
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struct ctl_dir { |
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/* Header must be at the start of ctl_dir */ |
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struct ctl_table_header header; |
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struct rb_root root; |
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}; |
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struct ctl_table_set { |
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int (*is_seen)(struct ctl_table_set *); |
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struct ctl_dir dir; |
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}; |
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struct ctl_table_root { |
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struct ctl_table_set default_set; |
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struct ctl_table_set *(*lookup)(struct ctl_table_root *root); |
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void (*set_ownership)(struct ctl_table_header *head, |
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struct ctl_table *table, |
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kuid_t *uid, kgid_t *gid); |
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int (*permissions)(struct ctl_table_header *head, struct ctl_table *table); |
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}; |
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/* struct ctl_path describes where in the hierarchy a table is added */ |
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struct ctl_path { |
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const char *procname; |
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}; |
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#ifdef CONFIG_SYSCTL |
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#define DECLARE_SYSCTL_BASE(_name, _table) \ |
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static struct ctl_table _name##_base_table[] = { \ |
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{ \ |
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.procname = #_name, \ |
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.mode = 0555, \ |
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.child = _table, \ |
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}, \ |
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{ }, \ |
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} |
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extern int __register_sysctl_base(struct ctl_table *base_table); |
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#define register_sysctl_base(_name) __register_sysctl_base(_name##_base_table) |
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void proc_sys_poll_notify(struct ctl_table_poll *poll); |
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extern void setup_sysctl_set(struct ctl_table_set *p, |
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struct ctl_table_root *root, |
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int (*is_seen)(struct ctl_table_set *)); |
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extern void retire_sysctl_set(struct ctl_table_set *set); |
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struct ctl_table_header *__register_sysctl_table( |
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struct ctl_table_set *set, |
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const char *path, struct ctl_table *table); |
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struct ctl_table_header *__register_sysctl_paths( |
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struct ctl_table_set *set, |
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const struct ctl_path *path, struct ctl_table *table); |
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struct ctl_table_header *register_sysctl(const char *path, struct ctl_table *table); |
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struct ctl_table_header *register_sysctl_table(struct ctl_table * table); |
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struct ctl_table_header *register_sysctl_paths(const struct ctl_path *path, |
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struct ctl_table *table); |
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void unregister_sysctl_table(struct ctl_table_header * table); |
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extern int sysctl_init_bases(void); |
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extern void __register_sysctl_init(const char *path, struct ctl_table *table, |
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const char *table_name); |
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#define register_sysctl_init(path, table) __register_sysctl_init(path, table, #table) |
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extern struct ctl_table_header *register_sysctl_mount_point(const char *path); |
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void do_sysctl_args(void); |
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int do_proc_douintvec(struct ctl_table *table, int write, |
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void *buffer, size_t *lenp, loff_t *ppos, |
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int (*conv)(unsigned long *lvalp, |
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unsigned int *valp, |
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int write, void *data), |
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void *data); |
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extern int pwrsw_enabled; |
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extern int unaligned_enabled; |
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extern int unaligned_dump_stack; |
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extern int no_unaligned_warning; |
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extern struct ctl_table sysctl_mount_point[]; |
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#else /* CONFIG_SYSCTL */ |
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#define DECLARE_SYSCTL_BASE(_name, _table) |
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static inline int __register_sysctl_base(struct ctl_table *base_table) |
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{ |
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return 0; |
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} |
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#define register_sysctl_base(table) __register_sysctl_base(table) |
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static inline struct ctl_table_header *register_sysctl_table(struct ctl_table * table) |
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{ |
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return NULL; |
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} |
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static inline void register_sysctl_init(const char *path, struct ctl_table *table) |
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{ |
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} |
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static inline struct ctl_table_header *register_sysctl_mount_point(const char *path) |
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{ |
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return NULL; |
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} |
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static inline struct ctl_table_header *register_sysctl_paths( |
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const struct ctl_path *path, struct ctl_table *table) |
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{ |
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return NULL; |
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} |
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static inline struct ctl_table_header *register_sysctl(const char *path, struct ctl_table *table) |
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{ |
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return NULL; |
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} |
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static inline void unregister_sysctl_table(struct ctl_table_header * table) |
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{ |
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} |
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static inline void setup_sysctl_set(struct ctl_table_set *p, |
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struct ctl_table_root *root, |
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int (*is_seen)(struct ctl_table_set *)) |
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{ |
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} |
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static inline void do_sysctl_args(void) |
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{ |
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} |
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#endif /* CONFIG_SYSCTL */ |
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int sysctl_max_threads(struct ctl_table *table, int write, void *buffer, |
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size_t *lenp, loff_t *ppos); |
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#endif /* _LINUX_SYSCTL_H */
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