Something went wrong. Try again.
(I'm so sorry!) Linux kernel mirror (for testing) git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git
kernel os linux
Something went wrong. Try again.
123456789101112131415161718192021222324252627282930313233343536373839404142434445464748495051525354555657585960616263646566676869707172737475767778798081828384858687888990919293949596979899100101102103104105106107108109110111112113114115116117118119120121122123124125126127128129130131132133134135136137138139140141142143144145146147148149150151152153154155156157158159160161162163164165166167168169170171172173174175176177178179180181182183184185186187188189190191192193194195196197198199200201202203204205206207208209210211212213214215216217218219220221222223224225226227228229230231232233234235236237238239240241242243244245246247248249250251252253254255256257258259260261262263264265266267268269270271272273274275276277278279280281282283284285286287288289290291292293294295296297298299300301302303304305306307308309310311312313314315316317318319320321322323324325326327328329330331332333334335336337338339340341342343344345346347348349350351352353354355356357358359360361362363364365366367/* 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_TWO ((void *)&sysctl_vals[2])#define SYSCTL_THREE ((void *)&sysctl_vals[3])#define SYSCTL_FOUR ((void *)&sysctl_vals[4])#define SYSCTL_ONE_HUNDRED ((void *)&sysctl_vals[5])#define SYSCTL_TWO_HUNDRED ((void *)&sysctl_vals[6])#define SYSCTL_ONE_THOUSAND ((void *)&sysctl_vals[7])#define SYSCTL_THREE_THOUSAND ((void *)&sysctl_vals[8])#define SYSCTL_INT_MAX ((void *)&sysctl_vals[9])
/* this is needed for the proc_dointvec_minmax for [fs_]overflow UID and GID */#define SYSCTL_MAXOLDUID ((void *)&sysctl_vals[10])#define SYSCTL_NEG_ONE ((void *)&sysctl_vals[11])
extern const int sysctl_vals[];
#define SYSCTL_LONG_ZERO ((void *)&sysctl_long_vals[0])#define SYSCTL_LONG_ONE ((void *)&sysctl_long_vals[1])#define SYSCTL_LONG_MAX ((void *)&sysctl_long_vals[2])
/* * * "dir" originates from read_iter (dir = 0) or write_iter (dir = 1) * in the file_operations struct at proc/proc_sysctl.c. Its value means * one of two things for sysctl: * 1. SYSCTL_USER_TO_KERN(dir) Writing to an internal kernel variable from user * space (dir > 0) * 2. SYSCTL_KERN_TO_USER(dir) Writing to a user space buffer from a kernel * variable (dir == 0). */#define SYSCTL_USER_TO_KERN(dir) (!!(dir))#define SYSCTL_KERN_TO_USER(dir) (!dir)
extern const unsigned long sysctl_long_vals[];
typedef int proc_handler(const struct ctl_table *ctl, int dir, void *buf, size_t *lenp, loff_t *ppos);
/* proc_handler functions */int proc_dostring(const struct ctl_table *ctl, int dir, void *buf, size_t *lenp, loff_t *ppos);int proc_dobool(const struct ctl_table *ctl, int dir, void *buf, size_t *lenp, loff_t *ppos);int proc_dointvec(const struct ctl_table *ctl, int dir, void *buf, size_t *lenp, loff_t *ppos);int proc_dointvec_minmax(const struct ctl_table *ctl, int dir, void *buf, size_t *lenp, loff_t *ppos);int proc_douintvec(const struct ctl_table *ctl, int dir, void *buf, size_t *lenp, loff_t *ppos);int proc_douintvec_minmax(const struct ctl_table *ctl, int dir, void *buf, size_t *lenp, loff_t *ppos);int proc_dou8vec_minmax(const struct ctl_table *ctl, int dir, void *buf, size_t *lenp, loff_t *ppos);int proc_doulongvec_minmax(const struct ctl_table *ctl, int dir, void *buf, size_t *lenp, loff_t *ppos);int proc_do_large_bitmap(const struct ctl_table *ctl, int dir, void *buf, size_t *lenp, loff_t *ppos);int proc_do_static_key(const struct ctl_table *ctl, int dir, void *buf, size_t *lenp, loff_t *ppos);
/* * proc_handler aggregators * * Create a proc_handler with a custom converter. Use when the user space * value is a transformation of the kernel value. Cannot be passed as * proc_handlers. * * Example of creating your custom proc handler: * int custom_converter(bool *negp, ulong *u_ptr, uint *k_ptr, * int dir, const struct ctl_table *ctl) {...} * int custom_proc_handler(const struct ctl_table *ctl, int dir, * void *buf, size_t *lenp, loff_t *ppos * { return proc_dointvec_conv(ctl, dir, buf, lenp, ppos, custom_converter); } */int proc_dointvec_conv(const struct ctl_table *ctl, int dir, void *buf, size_t *lenp, loff_t *ppos, int (*conv)(bool *negp, unsigned long *u_ptr, int *k_ptr, int dir, const struct ctl_table *ctl));int proc_douintvec_conv(const struct ctl_table *ctl, int dir, void *buf, size_t *lenp, loff_t *ppos, int (*conv)(bool *negp, ulong *u_ptr, uint *k_ptr, int dir, const struct ctl_table *ctl));int proc_doulongvec_conv(const struct ctl_table *ctl, int dir, void *buf, size_t *lenp, loff_t *ppos, int (*conv)(bool *negp, ulong *u_ptr, ulong *k_ptr, int dir, const struct ctl_table *ctl));
/* * bi-directional converter functions * * Specify the converter function for both directions (user to kernel & kernel * to user). Use when you want to change the value of the variable before * assignment. Used to create custom proc_handler aggregators. * * Example of creating your custom bi-directional converter: * int custom_u2k(ulong *u_ptr, const uint *k_ptr) { ... } * int custom_converter(bool *negp, ulong *u_ptr, uint *k_ptr, * int dir, const struct ctl_table *ctl) * { return proc_uint_conv(u_ptr, k_ptr, dir, ctl, true, * custom_u2k, proc_uint_k2u_conv} */int proc_int_conv(bool *negp, ulong *u_ptr, int *k_ptr, int dir, const struct ctl_table *tbl, bool k_ptr_range_check, int (*user_to_kern)(const bool *negp, const ulong *u_ptr, int *k_ptr), int (*kern_to_user)(bool *negp, ulong *u_ptr, const int *k_ptr));int proc_uint_conv(ulong *u_ptr, uint *k_ptr, int dir, const struct ctl_table *tbl, bool k_ptr_range_check, int (*user_to_kern)(const ulong *u_ptr, uint *k_ptr), int (*kern_to_user)(ulong *u_ptr, const uint *k_ptr));int proc_ulong_conv(ulong *u_ptr, ulong *k_ptr, int dir, const struct ctl_table *tbl, bool k_ptr_range_check, int (*user_to_kern)(const ulong *u_ptr, ulong *k_ptr), int (*kern_to_user)(ulong *u_ptr, const ulong *k_ptr));
/* * uni-directional converter functions * * Specify the converter function for one directions (user to kernel or * kernel to user). Use to call the actual value conversion. Used to Create * bi-directional converters. * * Example of creating a uni-directional converter: * ulong op(const ulong val) { ... } * int custom_unidir_conv(ulong *u_ptr, const uint *k_ptr) * { return proc_uint_k2u_conv_kop(u_ptr, k_ptr, op); } */int proc_int_k2u_conv_kop(ulong *u_ptr, const int *k_ptr, bool *negp, ulong (*k_ptr_op)(const ulong));int proc_int_u2k_conv_uop(const ulong *u_ptr, int *k_ptr, const bool *negp, ulong (*u_ptr_op)(const ulong));int proc_uint_k2u_conv(ulong *u_ptr, const uint *k_ptr);int proc_uint_u2k_conv_uop(const ulong *u_ptr, uint *k_ptr, ulong (*u_ptr_op)(const ulong));int proc_ulong_u2k_conv_uop(const ulong *u_ptr, ulong *k_ptr, ulong (*u_ptr_op)(const ulong));int proc_ulong_k2u_conv_kop(ulong *u_ptr, const ulong *k_ptr, ulong (*k_ptr_op)(const ulong));
/* * Register a set of sysctl names by calling register_sysctl * with an initialised array of struct ctl_table's. * * 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 */ void *data; int maxlen; umode_t mode; 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 - maintains dynamic lists of struct ctl_table trees * @ctl_table: pointer to the first element in ctl_table array * @ctl_table_size: number of elements pointed by @ctl_table * @used: The entry will never be touched when equal to 0. * @count: Upped every time something is added to @inodes and downed every time * something is removed from inodes * @nreg: When nreg drops to 0 the ctl_table_header will be unregistered. * @rcu: Delays the freeing of the inode. Introduced with "unfuck proc_sysctl ->d_compare()" * * @type: Enumeration to differentiate between ctl target types: * type.SYSCTL_TABLE_TYPE_DEFAULT: ctl target with no special considerations * type.SYSCTL_TABLE_TYPE_PERMANENTLY_EMPTY: Identifies a permanently empty dir * target to serve as a mount point */struct ctl_table_header { union { struct { const struct ctl_table *ctl_table; int ctl_table_size; int used; int count; int nreg; }; struct rcu_head rcu; }; struct completion *unregistering; const 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 */ enum { SYSCTL_TABLE_TYPE_DEFAULT, SYSCTL_TABLE_TYPE_PERMANENTLY_EMPTY, } type;};
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, kuid_t *uid, kgid_t *gid); int (*permissions)(struct ctl_table_header *head, const struct ctl_table *table);};
#define register_sysctl(path, table) \ register_sysctl_sz(path, table, ARRAY_SIZE(table))
#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, const struct ctl_table *table, size_t table_size);struct ctl_table_header *register_sysctl_sz(const char *path, const struct ctl_table *table, size_t table_size);void unregister_sysctl_table(struct ctl_table_header * table);
extern int sysctl_init_bases(void);extern void __register_sysctl_init(const char *path, const struct ctl_table *table, const char *table_name, size_t table_size);#define register_sysctl_init(path, table) \ __register_sysctl_init(path, table, #table, ARRAY_SIZE(table))extern struct ctl_table_header *register_sysctl_mount_point(const char *path);
void do_sysctl_args(void);bool sysctl_is_alias(char *param);
extern int unaligned_enabled;extern int no_unaligned_warning;
#else /* CONFIG_SYSCTL */
static inline void register_sysctl_init(const char *path, const struct ctl_table *table){}
static inline struct ctl_table_header *register_sysctl_mount_point(const char *path){ return NULL;}
static inline struct ctl_table_header *register_sysctl_sz(const char *path, const struct ctl_table *table, size_t table_size){ 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){}
static inline bool sysctl_is_alias(char *param){ return false;}#endif /* CONFIG_SYSCTL */
#endif /* _LINUX_SYSCTL_H */