include/linux/sysctl.h

   1 /*
   2  * sysctl.h: General linux system control interface
   3  *
   4  * Begun 24 March 1995, Stephen Tweedie
   5  *
   6  ****************************************************************
   7  ****************************************************************
   8  **
   9  **  WARNING:
  10  **  The values in this file are exported to user space via
  11  **  the sysctl() binary interface.  Do *NOT* change the
  12  **  numbering of any existing values here, and do not change
  13  **  any numbers within any one set of values.  If you have
  14  **  to redefine an existing interface, use a new number for it.
  15  **  The kernel will then return ENOTDIR to any application using
  16  **  the old binary interface.
  17  **
  18  **  --sct
  19  **
  20  ****************************************************************
  21  ****************************************************************
  22  */
  23
  24 #include <linux/lists.h>
  25
  26 #ifndef _LINUX_SYSCTL_H
  27 #define _LINUX_SYSCTL_H
  28
  29 #define CTL_MAXNAME 10
  30
  31 struct __sysctl_args {
  32         int *name;
  33         int nlen;
  34         void *oldval;
  35         size_t *oldlenp;
  36         void *newval;
  37         size_t newlen;
  38         unsigned long __unused[4];
  39 };
  40
  41 /* Define sysctl names first */
  42
  43 /* Top-level names: */
  44
  45 /* For internal pattern-matching use only: */
  46 #ifdef __KERNEL__
  47 #define CTL_ANY         -1      /* Matches any name */
  48 #define CTL_NONE        0
  49 #endif
  50
  51 enum
  52 {
  53         CTL_KERN=1,             /* General kernel info and control */
  54         CTL_VM=2,               /* VM management */
  55         CTL_NET=3,              /* Networking */
  56         CTL_PROC=4,             /* Process info */
  57         CTL_FS=5,               /* Filesystems */
  58         CTL_DEBUG=6,            /* Debugging */
  59         CTL_DEV=7,              /* Devices */
  60         CTL_BUS=8               /* Buses */
  61 };
  62
  63 /* CTL_BUS names: */
  64 enum
  65 {
  66         BUS_ISA=1               /* ISA */
  67 };
  68
  69 /* CTL_KERN names: */
  70 enum
  71 {
  72         KERN_OSTYPE=1,          /* string: system version */
  73         KERN_OSRELEASE=2,       /* string: system release */
  74         KERN_OSREV=3,           /* int: system revision */
  75         KERN_VERSION=4,         /* string: compile time info */
  76         KERN_SECUREMASK=5,      /* struct: maximum rights mask */
  77         KERN_PROF=6,            /* table: profiling information */
  78         KERN_NODENAME=7,
  79         KERN_DOMAINNAME=8,
  80
  81         KERN_CAP_BSET=14,       /* int: capability bounding set */
  82         KERN_PANIC=15,          /* int: panic timeout */
  83         KERN_REALROOTDEV=16,    /* real root device to mount after initrd */
  84
  85         KERN_SPARC_REBOOT=21,   /* reboot command on Sparc */
  86         KERN_CTLALTDEL=22,      /* int: allow ctl-alt-del to reboot */
  87         KERN_PRINTK=23,         /* struct: control printk logging parameters */
  88         KERN_NAMETRANS=24,      /* Name translation */
  89         KERN_PPC_HTABRECLAIM=25, /* turn htab reclaimation on/off on PPC */
  90         KERN_PPC_ZEROPAGED=26,  /* turn idle page zeroing on/off on PPC */
  91         KERN_PPC_POWERSAVE_NAP=27, /* use nap mode for power saving */
  92         KERN_MODPROBE=28,
  93         KERN_SG_BIG_BUFF=29,
  94         KERN_ACCT=30,           /* BSD process accounting parameters */
  95         KERN_PPC_L2CR=31,       /* l2cr register on PPC */
  96
  97         KERN_RTSIGNR=32,        /* Number of rt sigs queued */
  98         KERN_RTSIGMAX=33,       /* Max queuable */
  99
 100         KERN_SHMMAX=34,         /* int: Maximum shared memory segment */
 101         KERN_MSGMAX=35,         /* int: Maximum size of a messege */
 102         KERN_MSGMNB=36,         /* int: Maximum message queue size */
 103         KERN_MSGPOOL=37,        /* int: Maximum system message pool size */
 104         KERN_SYSRQ=38,          /* int: Sysreq enable */
 105         KERN_MAX_THREADS=39,    /* int: Maximum nr of threads in the system */
 106         KERN_RANDOM=40          /* Random driver */
 107 };
 108
 109
 110 /* CTL_VM names: */
 111 enum
 112 {
 113         VM_SWAPCTL=1,           /* struct: Set vm swapping control */
 114         VM_SWAPOUT=2,           /* int: Background pageout interval */
 115         VM_FREEPG=3,            /* struct: Set free page thresholds */
 116         VM_BDFLUSH=4,           /* struct: Control buffer cache flushing */
 117         VM_OVERCOMMIT_MEMORY=5, /* Turn off the virtual memory safety limit */
 118         VM_BUFFERMEM=6,         /* struct: Set buffer memory thresholds */
 119         VM_PAGECACHE=7,         /* struct: Set cache memory thresholds */
 120         VM_PAGERDAEMON=8,       /* struct: Control kswapd behaviour */
 121         VM_PGT_CACHE=9,         /* struct: Set page table cache parameters */
 122         VM_PAGE_CLUSTER=10      /* int: set number of pages to swap together */
 123 };
 124
 125
 126 /* CTL_NET names: */
 127 enum
 128 {
 129         NET_CORE=1,
 130         NET_ETHER=2,
 131         NET_802=3,
 132         NET_UNIX=4,
 133         NET_IPV4=5,
 134         NET_IPX=6,
 135         NET_ATALK=7,
 136         NET_NETROM=8,
 137         NET_AX25=9,
 138         NET_BRIDGE=10,
 139         NET_ROSE=11,
 140         NET_IPV6=12,
 141         NET_X25=13,
 142         NET_TR=14,
 143         NET_DECNET=15,
 144         NET_ECONET=16,
 145         NET_KHTTPD=17
 146 };
 147
 148 /* /proc/sys/kernel/random */
 149 enum
 150 {
 151         RANDOM_POOLSIZE=1,
 152         RANDOM_ENTROPY_COUNT=2,
 153         RANDOM_READ_THRESH=3,
 154         RANDOM_WRITE_THRESH=4,
 155         RANDOM_BOOT_ID=5,
 156         RANDOM_UUID=6
 157 };
 158
 159 /* /proc/sys/bus/isa */
 160 enum
 161 {
 162         BUS_ISA_MEM_BASE=1,
 163         BUS_ISA_PORT_BASE=2,
 164         BUS_ISA_PORT_SHIFT=3
 165 };
 166
 167 /* /proc/sys/net/core */
 168 enum
 169 {
 170         NET_CORE_WMEM_MAX=1,
 171         NET_CORE_RMEM_MAX=2,
 172         NET_CORE_WMEM_DEFAULT=3,
 173         NET_CORE_RMEM_DEFAULT=4,
 174 /* was  NET_CORE_DESTROY_DELAY */
 175         NET_CORE_MAX_BACKLOG=6,
 176         NET_CORE_FASTROUTE=7,
 177         NET_CORE_MSG_COST=8,
 178         NET_CORE_MSG_BURST=9,
 179         NET_CORE_OPTMEM_MAX=10
 180 };
 181
 182 /* /proc/sys/net/ethernet */
 183
 184 /* /proc/sys/net/802 */
 185
 186 /* /proc/sys/net/unix */
 187
 188 enum
 189 {
 190         NET_UNIX_DESTROY_DELAY=1,
 191         NET_UNIX_DELETE_DELAY=2,
 192         NET_UNIX_MAX_DGRAM_QLEN=3,
 193 };
 194
 195 /* /proc/sys/net/ipv4 */
 196 enum
 197 {
 198         /* v2.0 compatibile variables */
 199         NET_IPV4_FORWARD=8,
 200         NET_IPV4_DYNADDR=9,
 201
 202         NET_IPV4_CONF=16,
 203         NET_IPV4_NEIGH=17,
 204         NET_IPV4_ROUTE=18,
 205         NET_IPV4_FIB_HASH=19,
 206
 207         NET_IPV4_TCP_TIMESTAMPS=33,
 208         NET_IPV4_TCP_WINDOW_SCALING=34,
 209         NET_IPV4_TCP_SACK=35,
 210         NET_IPV4_TCP_RETRANS_COLLAPSE=36,
 211         NET_IPV4_DEFAULT_TTL=37,
 212         NET_IPV4_AUTOCONFIG=38,
 213         NET_IPV4_NO_PMTU_DISC=39,
 214         NET_IPV4_TCP_SYN_RETRIES=40,
 215         NET_IPV4_IPFRAG_HIGH_THRESH=41,
 216         NET_IPV4_IPFRAG_LOW_THRESH=42,
 217         NET_IPV4_IPFRAG_TIME=43,
 218         NET_IPV4_TCP_MAX_KA_PROBES=44,
 219         NET_IPV4_TCP_KEEPALIVE_TIME=45,
 220         NET_IPV4_TCP_KEEPALIVE_PROBES=46,
 221         NET_IPV4_TCP_RETRIES1=47,
 222         NET_IPV4_TCP_RETRIES2=48,
 223         NET_IPV4_TCP_FIN_TIMEOUT=49,
 224         NET_IPV4_IP_MASQ_DEBUG=50,
 225         NET_TCP_SYNCOOKIES=51,
 226         NET_TCP_STDURG=52,
 227         NET_TCP_RFC1337=53,
 228         NET_TCP_SYN_TAILDROP=54,
 229         NET_TCP_MAX_SYN_BACKLOG=55,
 230         NET_IPV4_LOCAL_PORT_RANGE=56,
 231         NET_IPV4_ICMP_ECHO_IGNORE_ALL=57,
 232         NET_IPV4_ICMP_ECHO_IGNORE_BROADCASTS=58,
 233         NET_IPV4_ICMP_SOURCEQUENCH_RATE=59,
 234         NET_IPV4_ICMP_DESTUNREACH_RATE=60,
 235         NET_IPV4_ICMP_TIMEEXCEED_RATE=61,
 236         NET_IPV4_ICMP_PARAMPROB_RATE=62,
 237         NET_IPV4_ICMP_ECHOREPLY_RATE=63,
 238         NET_IPV4_ICMP_IGNORE_BOGUS_ERROR_RESPONSES=64,
 239         NET_IPV4_IGMP_MAX_MEMBERSHIPS=65,
 240         NET_TCP_TW_RECYCLE=66,
 241         NET_IPV4_TCP_KEEPALIVE_INTVL=67,
 242 };
 243
 244 enum {
 245         NET_IPV4_ROUTE_FLUSH=1,
 246         NET_IPV4_ROUTE_MIN_DELAY=2,
 247         NET_IPV4_ROUTE_MAX_DELAY=3,
 248         NET_IPV4_ROUTE_GC_THRESH=4,
 249         NET_IPV4_ROUTE_MAX_SIZE=5,
 250         NET_IPV4_ROUTE_GC_MIN_INTERVAL=6,
 251         NET_IPV4_ROUTE_GC_TIMEOUT=7,
 252         NET_IPV4_ROUTE_GC_INTERVAL=8,
 253         NET_IPV4_ROUTE_REDIRECT_LOAD=9,
 254         NET_IPV4_ROUTE_REDIRECT_NUMBER=10,
 255         NET_IPV4_ROUTE_REDIRECT_SILENCE=11,
 256         NET_IPV4_ROUTE_ERROR_COST=12,
 257         NET_IPV4_ROUTE_ERROR_BURST=13,
 258         NET_IPV4_ROUTE_GC_ELASTICITY=14,
 259         NET_IPV4_ROUTE_MTU_EXPIRES=15,
 260         NET_IPV4_ROUTE_MIN_PMTU=16,
 261         NET_IPV4_ROUTE_MIN_ADVMSS=17
 262 };
 263
 264 enum
 265 {
 266         NET_PROTO_CONF_ALL=-2,
 267         NET_PROTO_CONF_DEFAULT=-3
 268
 269         /* And device ifindices ... */
 270 };
 271
 272 enum
 273 {
 274         NET_IPV4_CONF_FORWARDING=1,
 275         NET_IPV4_CONF_MC_FORWARDING=2,
 276         NET_IPV4_CONF_PROXY_ARP=3,
 277         NET_IPV4_CONF_ACCEPT_REDIRECTS=4,
 278         NET_IPV4_CONF_SECURE_REDIRECTS=5,
 279         NET_IPV4_CONF_SEND_REDIRECTS=6,
 280         NET_IPV4_CONF_SHARED_MEDIA=7,
 281         NET_IPV4_CONF_RP_FILTER=8,
 282         NET_IPV4_CONF_ACCEPT_SOURCE_ROUTE=9,
 283         NET_IPV4_CONF_BOOTP_RELAY=10,
 284         NET_IPV4_CONF_LOG_MARTIANS=11,
 285         NET_IPV4_CONF_TAG=12
 286 };
 287
 288 /* /proc/sys/net/ipv6 */
 289 enum {
 290         NET_IPV6_CONF=16,
 291         NET_IPV6_NEIGH=17,
 292         NET_IPV6_ROUTE=18
 293 };
 294
 295 enum {
 296         NET_IPV6_ROUTE_FLUSH=1,
 297         NET_IPV6_ROUTE_GC_THRESH=2,
 298         NET_IPV6_ROUTE_MAX_SIZE=3,
 299         NET_IPV6_ROUTE_GC_MIN_INTERVAL=4,
 300         NET_IPV6_ROUTE_GC_TIMEOUT=5,
 301         NET_IPV6_ROUTE_GC_INTERVAL=6,
 302         NET_IPV6_ROUTE_GC_ELASTICITY=7,
 303         NET_IPV6_ROUTE_MTU_EXPIRES=8,
 304         NET_IPV6_ROUTE_MIN_ADVMSS=9
 305 };
 306
 307 enum {
 308         NET_IPV6_FORWARDING=1,
 309         NET_IPV6_HOP_LIMIT=2,
 310         NET_IPV6_MTU=3,
 311         NET_IPV6_ACCEPT_RA=4,
 312         NET_IPV6_ACCEPT_REDIRECTS=5,
 313         NET_IPV6_AUTOCONF=6,
 314         NET_IPV6_DAD_TRANSMITS=7,
 315         NET_IPV6_RTR_SOLICITS=8,
 316         NET_IPV6_RTR_SOLICIT_INTERVAL=9,
 317         NET_IPV6_RTR_SOLICIT_DELAY=10
 318 };
 319
 320 /* /proc/sys/net/<protocol>/neigh/<dev> */
 321 enum {
 322         NET_NEIGH_MCAST_SOLICIT=1,
 323         NET_NEIGH_UCAST_SOLICIT=2,
 324         NET_NEIGH_APP_SOLICIT=3,
 325         NET_NEIGH_RETRANS_TIME=4,
 326         NET_NEIGH_REACHABLE_TIME=5,
 327         NET_NEIGH_DELAY_PROBE_TIME=6,
 328         NET_NEIGH_GC_STALE_TIME=7,
 329         NET_NEIGH_UNRES_QLEN=8,
 330         NET_NEIGH_PROXY_QLEN=9,
 331         NET_NEIGH_ANYCAST_DELAY=10,
 332         NET_NEIGH_PROXY_DELAY=11,
 333         NET_NEIGH_LOCKTIME=12,
 334         NET_NEIGH_GC_INTERVAL=13,
 335         NET_NEIGH_GC_THRESH1=14,
 336         NET_NEIGH_GC_THRESH2=15,
 337         NET_NEIGH_GC_THRESH3=16
 338 };
 339
 340 /* /proc/sys/net/ipx */
 341
 342
 343 /* /proc/sys/net/appletalk */
 344 enum {
 345         NET_ATALK_AARP_EXPIRY_TIME=1,
 346         NET_ATALK_AARP_TICK_TIME=2,
 347         NET_ATALK_AARP_RETRANSMIT_LIMIT=3,
 348         NET_ATALK_AARP_RESOLVE_TIME=4
 349 };
 350
 351
 352 /* /proc/sys/net/netrom */
 353 enum {
 354         NET_NETROM_DEFAULT_PATH_QUALITY=1,
 355         NET_NETROM_OBSOLESCENCE_COUNT_INITIALISER=2,
 356         NET_NETROM_NETWORK_TTL_INITIALISER=3,
 357         NET_NETROM_TRANSPORT_TIMEOUT=4,
 358         NET_NETROM_TRANSPORT_MAXIMUM_TRIES=5,
 359         NET_NETROM_TRANSPORT_ACKNOWLEDGE_DELAY=6,
 360         NET_NETROM_TRANSPORT_BUSY_DELAY=7,
 361         NET_NETROM_TRANSPORT_REQUESTED_WINDOW_SIZE=8,
 362         NET_NETROM_TRANSPORT_NO_ACTIVITY_TIMEOUT=9,
 363         NET_NETROM_ROUTING_CONTROL=10,
 364         NET_NETROM_LINK_FAILS_COUNT=11
 365 };
 366
 367 /* /proc/sys/net/ax25 */
 368 enum {
 369         NET_AX25_IP_DEFAULT_MODE=1,
 370         NET_AX25_DEFAULT_MODE=2,
 371         NET_AX25_BACKOFF_TYPE=3,
 372         NET_AX25_CONNECT_MODE=4,
 373         NET_AX25_STANDARD_WINDOW=5,
 374         NET_AX25_EXTENDED_WINDOW=6,
 375         NET_AX25_T1_TIMEOUT=7,
 376         NET_AX25_T2_TIMEOUT=8,
 377         NET_AX25_T3_TIMEOUT=9,
 378         NET_AX25_IDLE_TIMEOUT=10,
 379         NET_AX25_N2=11,
 380         NET_AX25_PACLEN=12,
 381         NET_AX25_PROTOCOL=13,
 382         NET_AX25_DAMA_SLAVE_TIMEOUT=14
 383 };
 384
 385 /* /proc/sys/net/rose */
 386 enum {
 387         NET_ROSE_RESTART_REQUEST_TIMEOUT=1,
 388         NET_ROSE_CALL_REQUEST_TIMEOUT=2,
 389         NET_ROSE_RESET_REQUEST_TIMEOUT=3,
 390         NET_ROSE_CLEAR_REQUEST_TIMEOUT=4,
 391         NET_ROSE_ACK_HOLD_BACK_TIMEOUT=5,
 392         NET_ROSE_ROUTING_CONTROL=6,
 393         NET_ROSE_LINK_FAIL_TIMEOUT=7,
 394         NET_ROSE_MAX_VCS=8,
 395         NET_ROSE_WINDOW_SIZE=9,
 396         NET_ROSE_NO_ACTIVITY_TIMEOUT=10
 397 };
 398
 399 /* /proc/sys/net/x25 */
 400 enum {
 401         NET_X25_RESTART_REQUEST_TIMEOUT=1,
 402         NET_X25_CALL_REQUEST_TIMEOUT=2,
 403         NET_X25_RESET_REQUEST_TIMEOUT=3,
 404         NET_X25_CLEAR_REQUEST_TIMEOUT=4,
 405         NET_X25_ACK_HOLD_BACK_TIMEOUT=5
 406 };
 407
 408 /* /proc/sys/net/token-ring */
 409 enum
 410 {
 411         NET_TR_RIF_TIMEOUT=1
 412 };
 413
 414 /* /proc/sys/net/decnet/ */
 415 enum {
 416         NET_DECNET_NODE_TYPE = 1,
 417         NET_DECNET_NODE_ADDRESS = 2,
 418         NET_DECNET_NODE_NAME = 3,
 419         NET_DECNET_DEFAULT_DEVICE = 4,
 420         NET_DECNET_TIME_WAIT = 5,
 421         NET_DECNET_DN_COUNT = 6,
 422         NET_DECNET_DI_COUNT = 7,
 423         NET_DECNET_DR_COUNT = 8,
 424         NET_DECNET_DST_GC_INTERVAL = 9,
 425         NET_DECNET_CONF = 10,
 426         NET_DECNET_DEBUG_LEVEL = 255
 427 };
 428
 429 /* /proc/sys/net/khttpd/ */
 430 enum {
 431         NET_KHTTPD_DOCROOT      = 1,
 432         NET_KHTTPD_START        = 2,
 433         NET_KHTTPD_STOP         = 3,
 434         NET_KHTTPD_UNLOAD       = 4,
 435         NET_KHTTPD_CLIENTPORT   = 5,
 436         NET_KHTTPD_PERMREQ      = 6,
 437         NET_KHTTPD_PERMFORBID   = 7,
 438         NET_KHTTPD_LOGGING      = 8,
 439         NET_KHTTPD_SERVERPORT   = 9,
 440         NET_KHTTPD_DYNAMICSTRING= 10,
 441         NET_KHTTPD_SLOPPYMIME   = 11,
 442         NET_KHTTPD_THREADS      = 12,
 443         NET_KHTTPD_MAXCONNECT   = 13
 444 };
 445
 446 /* /proc/sys/net/decnet/conf/<dev> */
 447 enum {
 448         NET_DECNET_CONF_LOOPBACK = -2,
 449         NET_DECNET_CONF_DDCMP = -3,
 450         NET_DECNET_CONF_PPP = -4,
 451         NET_DECNET_CONF_X25 = -5,
 452         NET_DECNET_CONF_GRE = -6,
 453         NET_DECNET_CONF_ETHER = -7
 454
 455         /* ... and ifindex of devices */
 456 };
 457
 458 /* /proc/sys/net/decnet/conf/<dev>/ */
 459 enum {
 460         NET_DECNET_CONF_DEV_PRIORITY = 1,
 461         NET_DECNET_CONF_DEV_T1 = 2,
 462         NET_DECNET_CONF_DEV_T2 = 3,
 463         NET_DECNET_CONF_DEV_T3 = 4,
 464         NET_DECNET_CONF_DEV_COST = 5,
 465         NET_DECNET_CONF_DEV_BLKSIZE = 6,
 466         NET_DECNET_CONF_DEV_STATE = 7
 467 };
 468
 469 /* CTL_PROC names: */
 470
 471 /* CTL_FS names: */
 472 enum
 473 {
 474         FS_NRINODE=1,   /* int:current number of allocated inodes */
 475         FS_STATINODE=2,
 476         FS_MAXINODE=3,  /* int:maximum number of inodes that can be allocated */
 477         FS_NRDQUOT=4,   /* int:current number of allocated dquots */
 478         FS_MAXDQUOT=5,  /* int:maximum number of dquots that can be allocated */
 479         FS_NRFILE=6,    /* int:current number of allocated filedescriptors */
 480         FS_MAXFILE=7,   /* int:maximum number of filedescriptors that can be allocated */
 481         FS_DENTRY=8,
 482         FS_NRSUPER=9,   /* int:current number of allocated super_blocks */
 483         FS_MAXSUPER=10  /* int:maximum number of super_blocks that can be allocated */
 484 };
 485
 486 /* CTL_DEBUG names: */
 487
 488 /* CTL_DEV names: */
 489 enum {
 490         DEV_CDROM=1,
 491         DEV_HWMON=2,
 492         DEV_PARPORT=3
 493 };
 494
 495 /* /proc/sys/dev/cdrom */
 496 enum {
 497         DEV_CDROM_INFO=1,
 498         DEV_CDROM_AUTOCLOSE=2,
 499         DEV_CDROM_AUTOEJECT=3,
 500         DEV_CDROM_DEBUG=4,
 501         DEV_CDROM_LOCK=5,
 502         DEV_CDROM_CHECK_MEDIA=6
 503 };
 504
 505 /* /proc/sys/dev/parport */
 506 enum {
 507         DEV_PARPORT_DEFAULT=-3
 508 };
 509
 510 /* /proc/sys/dev/parport/default */
 511 enum {
 512         DEV_PARPORT_DEFAULT_TIMESLICE=1,
 513         DEV_PARPORT_DEFAULT_SPINTIME=2
 514 };
 515
 516 /* /proc/sys/dev/parport/parport n */
 517 enum {
 518         DEV_PARPORT_SPINTIME=1,
 519         DEV_PARPORT_HARDWARE=2,
 520         DEV_PARPORT_DEVICES=3,
 521         DEV_PARPORT_AUTOPROBE=16
 522 };
 523
 524 /* /proc/sys/dev/parport/parport n/devices/ */
 525 enum {
 526         DEV_PARPORT_DEVICES_ACTIVE=-3,
 527 };
 528
 529 /* /proc/sys/dev/parport/parport n/devices/device n */
 530 enum {
 531         DEV_PARPORT_DEVICE_TIMESLICE=1,
 532 };
 533
 534 #ifdef __KERNEL__
 535
 536 extern asmlinkage long sys_sysctl(struct __sysctl_args *);
 537 extern void sysctl_init(void);
 538
 539 typedef struct ctl_table ctl_table;
 540
 541 typedef int ctl_handler (ctl_table *table, int *name, int nlen,
 542                          void *oldval, size_t *oldlenp,
 543                          void *newval, size_t newlen,
 544                          void **context);
 545
 546 typedef int proc_handler (ctl_table *ctl, int write, struct file * filp,
 547                           void *buffer, size_t *lenp);
 548
 549 extern int proc_dostring(ctl_table *, int, struct file *,
 550                          void *, size_t *);
 551 extern int proc_dointvec(ctl_table *, int, struct file *,
 552                          void *, size_t *);
 553 extern int proc_dointvec_bset(ctl_table *, int, struct file *,
 554                               void *, size_t *);
 555 extern int proc_dointvec_minmax(ctl_table *, int, struct file *,
 556                                 void *, size_t *);
 557 extern int proc_dointvec_jiffies(ctl_table *, int, struct file *,
 558                                  void *, size_t *);
 559 extern int proc_doulongvec_minmax(ctl_table *, int, struct file *,
 560                                   void *, size_t *);
 561 extern int proc_doulongvec_ms_jiffies_minmax(ctl_table *table, int,
 562                                       struct file *, void *, size_t *);
 563
 564 extern int do_sysctl (int *name, int nlen,
 565                       void *oldval, size_t *oldlenp,
 566                       void *newval, size_t newlen);
 567
 568 extern int do_sysctl_strategy (ctl_table *table,
 569                                int *name, int nlen,
 570                                void *oldval, size_t *oldlenp,
 571                                void *newval, size_t newlen, void ** context);
 572
 573 extern ctl_handler sysctl_string;
 574 extern ctl_handler sysctl_intvec;
 575 extern ctl_handler sysctl_jiffies;
 576
 577 extern int do_string (
 578         void *oldval, size_t *oldlenp, void *newval, size_t newlen,
 579         int rdwr, char *data, size_t max);
 580 extern int do_int (
 581         void *oldval, size_t *oldlenp, void *newval, size_t newlen,
 582         int rdwr, int *data);
 583 extern int do_struct (
 584         void *oldval, size_t *oldlenp, void *newval, size_t newlen,
 585         int rdwr, void *data, size_t len);
 586
 587
 588 /*
 589  * Register a set of sysctl names by calling register_sysctl_table
 590  * with an initialised array of ctl_table's.  An entry with zero
 591  * ctl_name terminates the table.  table->de will be set up by the
 592  * registration and need not be initialised in advance.
 593  *
 594  * sysctl names can be mirrored automatically under /proc/sys.  The
 595  * procname supplied controls /proc naming.
 596  *
 597  * The table's mode will be honoured both for sys_sysctl(2) and
 598  * proc-fs access.
 599  *
 600  * Leaf nodes in the sysctl tree will be represented by a single file
 601  * under /proc; non-leaf nodes will be represented by directories.  A
 602  * null procname disables /proc mirroring at this node.
 603  *
 604  * sysctl(2) can automatically manage read and write requests through
 605  * the sysctl table.  The data and maxlen fields of the ctl_table
 606  * struct enable minimal validation of the values being written to be
 607  * performed, and the mode field allows minimal authentication.
 608  *
 609  * More sophisticated management can be enabled by the provision of a
 610  * strategy routine with the table entry.  This will be called before
 611  * any automatic read or write of the data is performed.
 612  *
 613  * The strategy routine may return:
 614  * <0: Error occurred (error is passed to user process)
 615  * 0:  OK - proceed with automatic read or write.
 616  * >0: OK - read or write has been done by the strategy routine, so
 617  *     return immediately.
 618  *
 619  * There must be a proc_handler routine for any terminal nodes
 620  * mirrored under /proc/sys (non-terminals are handled by a built-in
 621  * directory handler).  Several default handlers are available to
 622  * cover common cases.
 623  */
 624
 625 /* A sysctl table is an array of struct ctl_table: */
 626 struct ctl_table
 627 {
 628         int ctl_name;                   /* Binary ID */
 629         const char *procname;           /* Text ID for /proc/sys, or zero */
 630         void *data;
 631         int maxlen;
 632         mode_t mode;
 633         ctl_table *child;
 634         proc_handler *proc_handler;     /* Callback for text formatting */
 635         ctl_handler *strategy;          /* Callback function for all r/w */
 636         struct proc_dir_entry *de;      /* /proc control block */
 637         void *extra1;
 638         void *extra2;
 639 };
 640
 641 /* struct ctl_table_header is used to maintain dynamic lists of
 642    ctl_table trees. */
 643 struct ctl_table_header
 644 {
 645         ctl_table *ctl_table;
 646         DLNODE(struct ctl_table_header) ctl_entry;
 647 };
 648
 649 struct ctl_table_header * register_sysctl_table(ctl_table * table,
 650                                                 int insert_at_head);
 651 void unregister_sysctl_table(struct ctl_table_header * table);
 652
 653 #else /* __KERNEL__ */
 654
 655 #endif /* __KERNEL__ */
 656
 657 #endif /* _LINUX_SYSCTL_H */