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  **  The values in this file are exported to user space via
  10  **  the sysctl() binary interface.  However this interface
  11  **  is unstable and deprecated and will be removed in the future.
  12  **  For a stable interface use /proc/sys.
  13  **
  14  ****************************************************************
  15  ****************************************************************
  16  */
  17
  18 #ifndef _LINUX_SYSCTL_H
  19 #define _LINUX_SYSCTL_H
  20
  21 #include <linux/kernel.h>
  22 #include <linux/types.h>
  23 #include <linux/list.h>
  24 #include <linux/compiler.h>
  25
  26 struct file;
  27
  28 #define CTL_MAXNAME 10          /* how many path components do we allow in a
  29                                    call to sysctl?   In other words, what is
  30                                    the largest acceptable value for the nlen
  31                                    member of a struct __sysctl_args to have? */
  32
  33 struct __sysctl_args {
  34         int __user *name;
  35         int nlen;
  36         void __user *oldval;
  37         size_t __user *oldlenp;
  38         void __user *newval;
  39         size_t newlen;
  40         unsigned long __unused[4];
  41 };
  42
  43 /* Define sysctl names first */
  44
  45 /* Top-level names: */
  46
  47 /* For internal pattern-matching use only: */
  48 #ifdef __KERNEL__
  49 #define CTL_ANY         -1      /* Matches any name */
  50 #define CTL_NONE        0
  51 #endif
  52
  53 enum
  54 {
  55         CTL_KERN=1,             /* General kernel info and control */
  56         CTL_VM=2,               /* VM management */
  57         CTL_NET=3,              /* Networking */
  58         CTL_PROC=4,             /* Process info */
  59         CTL_FS=5,               /* Filesystems */
  60         CTL_DEBUG=6,            /* Debugging */
  61         CTL_DEV=7,              /* Devices */
  62         CTL_BUS=8,              /* Busses */
  63         CTL_ABI=9,              /* Binary emulation */
  64         CTL_CPU=10              /* CPU stuff (speed scaling, etc) */
  65 };
  66
  67 /* CTL_BUS names: */
  68 enum
  69 {
  70         CTL_BUS_ISA=1           /* ISA */
  71 };
  72
  73 /* CTL_KERN names: */
  74 enum
  75 {
  76         KERN_OSTYPE=1,          /* string: system version */
  77         KERN_OSRELEASE=2,       /* string: system release */
  78         KERN_OSREV=3,           /* int: system revision */
  79         KERN_VERSION=4,         /* string: compile time info */
  80         KERN_SECUREMASK=5,      /* struct: maximum rights mask */
  81         KERN_PROF=6,            /* table: profiling information */
  82         KERN_NODENAME=7,
  83         KERN_DOMAINNAME=8,
  84
  85         KERN_CAP_BSET=14,       /* int: capability bounding set */
  86         KERN_PANIC=15,          /* int: panic timeout */
  87         KERN_REALROOTDEV=16,    /* real root device to mount after initrd */
  88
  89         KERN_SPARC_REBOOT=21,   /* reboot command on Sparc */
  90         KERN_CTLALTDEL=22,      /* int: allow ctl-alt-del to reboot */
  91         KERN_PRINTK=23,         /* struct: control printk logging parameters */
  92         KERN_NAMETRANS=24,      /* Name translation */
  93         KERN_PPC_HTABRECLAIM=25, /* turn htab reclaimation on/off on PPC */
  94         KERN_PPC_ZEROPAGED=26,  /* turn idle page zeroing on/off on PPC */
  95         KERN_PPC_POWERSAVE_NAP=27, /* use nap mode for power saving */
  96         KERN_MODPROBE=28,
  97         KERN_SG_BIG_BUFF=29,
  98         KERN_ACCT=30,           /* BSD process accounting parameters */
  99         KERN_PPC_L2CR=31,       /* l2cr register on PPC */
 100
 101         KERN_RTSIGNR=32,        /* Number of rt sigs queued */
 102         KERN_RTSIGMAX=33,       /* Max queuable */
 103
 104         KERN_SHMMAX=34,         /* long: Maximum shared memory segment */
 105         KERN_MSGMAX=35,         /* int: Maximum size of a messege */
 106         KERN_MSGMNB=36,         /* int: Maximum message queue size */
 107         KERN_MSGPOOL=37,        /* int: Maximum system message pool size */
 108         KERN_SYSRQ=38,          /* int: Sysreq enable */
 109         KERN_MAX_THREADS=39,    /* int: Maximum nr of threads in the system */
 110         KERN_RANDOM=40,         /* Random driver */
 111         KERN_SHMALL=41,         /* int: Maximum size of shared memory */
 112         KERN_MSGMNI=42,         /* int: msg queue identifiers */
 113         KERN_SEM=43,            /* struct: sysv semaphore limits */
 114         KERN_SPARC_STOP_A=44,   /* int: Sparc Stop-A enable */
 115         KERN_SHMMNI=45,         /* int: shm array identifiers */
 116         KERN_OVERFLOWUID=46,    /* int: overflow UID */
 117         KERN_OVERFLOWGID=47,    /* int: overflow GID */
 118         KERN_SHMPATH=48,        /* string: path to shm fs */
 119         KERN_HOTPLUG=49,        /* string: path to hotplug policy agent */
 120         KERN_IEEE_EMULATION_WARNINGS=50, /* int: unimplemented ieee instructions */
 121         KERN_S390_USER_DEBUG_LOGGING=51,  /* int: dumps of user faults */
 122         KERN_CORE_USES_PID=52,          /* int: use core or core.%pid */
 123         KERN_TAINTED=53,        /* int: various kernel tainted flags */
 124         KERN_CADPID=54,         /* int: PID of the process to notify on CAD */
 125         KERN_PIDMAX=55,         /* int: PID # limit */
 126         KERN_CORE_PATTERN=56,   /* string: pattern for core-file names */
 127         KERN_PANIC_ON_OOPS=57,  /* int: whether we will panic on an oops */
 128         KERN_HPPA_PWRSW=58,     /* int: hppa soft-power enable */
 129         KERN_HPPA_UNALIGNED=59, /* int: hppa unaligned-trap enable */
 130         KERN_PRINTK_RATELIMIT=60, /* int: tune printk ratelimiting */
 131         KERN_PRINTK_RATELIMIT_BURST=61, /* int: tune printk ratelimiting */
 132         KERN_PTY=62,            /* dir: pty driver */
 133         KERN_NGROUPS_MAX=63,    /* int: NGROUPS_MAX */
 134         KERN_SPARC_SCONS_PWROFF=64, /* int: serial console power-off halt */
 135         KERN_HZ_TIMER=65,       /* int: hz timer on or off */
 136         KERN_UNKNOWN_NMI_PANIC=66, /* int: unknown nmi panic flag */
 137         KERN_SETUID_DUMPABLE=67, /* int: behaviour of dumps for setuid core */
 138         KERN_VSHELPER=68,       /* string: path to vshelper policy agent */
 139         KERN_DUMP=69,           /* dir: dump parameters */
 140 };
 141
 142
 143 /* CTL_VM names: */
 144 enum
 145 {
 146         VM_UNUSED1=1,           /* was: struct: Set vm swapping control */
 147         VM_UNUSED2=2,           /* was; int: Linear or sqrt() swapout for hogs */
 148         VM_UNUSED3=3,           /* was: struct: Set free page thresholds */
 149         VM_UNUSED4=4,           /* Spare */
 150         VM_OVERCOMMIT_MEMORY=5, /* Turn off the virtual memory safety limit */
 151         VM_UNUSED5=6,           /* was: struct: Set buffer memory thresholds */
 152         VM_UNUSED7=7,           /* was: struct: Set cache memory thresholds */
 153         VM_UNUSED8=8,           /* was: struct: Control kswapd behaviour */
 154         VM_UNUSED9=9,           /* was: struct: Set page table cache parameters */
 155         VM_PAGE_CLUSTER=10,     /* int: set number of pages to swap together */
 156         VM_DIRTY_BACKGROUND=11, /* dirty_background_ratio */
 157         VM_DIRTY_RATIO=12,      /* dirty_ratio */
 158         VM_DIRTY_WB_CS=13,      /* dirty_writeback_centisecs */
 159         VM_DIRTY_EXPIRE_CS=14,  /* dirty_expire_centisecs */
 160         VM_NR_PDFLUSH_THREADS=15, /* nr_pdflush_threads */
 161         VM_OVERCOMMIT_RATIO=16, /* percent of RAM to allow overcommit in */
 162         VM_PAGEBUF=17,          /* struct: Control pagebuf parameters */
 163         VM_HUGETLB_PAGES=18,    /* int: Number of available Huge Pages */
 164         VM_SWAPPINESS=19,       /* Tendency to steal mapped memory */
 165         VM_LOWER_ZONE_PROTECTION=20,/* Amount of protection of lower zones */
 166         VM_MIN_FREE_KBYTES=21,  /* Minimum free kilobytes to maintain */
 167         VM_MAX_MAP_COUNT=22,    /* int: Maximum number of mmaps/address-space */
 168         VM_LAPTOP_MODE=23,      /* vm laptop mode */
 169         VM_BLOCK_DUMP=24,       /* block dump mode */
 170         VM_HUGETLB_GROUP=25,    /* permitted hugetlb group */
 171         VM_VFS_CACHE_PRESSURE=26, /* dcache/icache reclaim pressure */
 172         VM_LEGACY_VA_LAYOUT=27, /* legacy/compatibility virtual address space layout */
 173 };
 174
 175
 176 /* CTL_NET names: */
 177 enum
 178 {
 179         NET_CORE=1,
 180         NET_ETHER=2,
 181         NET_802=3,
 182         NET_UNIX=4,
 183         NET_IPV4=5,
 184         NET_IPX=6,
 185         NET_ATALK=7,
 186         NET_NETROM=8,
 187         NET_AX25=9,
 188         NET_BRIDGE=10,
 189         NET_ROSE=11,
 190         NET_IPV6=12,
 191         NET_X25=13,
 192         NET_TR=14,
 193         NET_DECNET=15,
 194         NET_ECONET=16,
 195         NET_SCTP=17,
 196         NET_TUX=18,
 197 };
 198
 199 /* /proc/sys/kernel/random */
 200 enum
 201 {
 202         RANDOM_POOLSIZE=1,
 203         RANDOM_ENTROPY_COUNT=2,
 204         RANDOM_READ_THRESH=3,
 205         RANDOM_WRITE_THRESH=4,
 206         RANDOM_BOOT_ID=5,
 207         RANDOM_UUID=6
 208 };
 209
 210 /* /proc/sys/kernel/pty */
 211 enum
 212 {
 213         PTY_MAX=1,
 214         PTY_NR=2
 215 };
 216
 217 /* /proc/sys/bus/isa */
 218 enum
 219 {
 220         BUS_ISA_MEM_BASE=1,
 221         BUS_ISA_PORT_BASE=2,
 222         BUS_ISA_PORT_SHIFT=3
 223 };
 224
 225 /* /proc/sys/net/core */
 226 enum
 227 {
 228         NET_CORE_WMEM_MAX=1,
 229         NET_CORE_RMEM_MAX=2,
 230         NET_CORE_WMEM_DEFAULT=3,
 231         NET_CORE_RMEM_DEFAULT=4,
 232 /* was  NET_CORE_DESTROY_DELAY */
 233         NET_CORE_MAX_BACKLOG=6,
 234         NET_CORE_FASTROUTE=7,
 235         NET_CORE_MSG_COST=8,
 236         NET_CORE_MSG_BURST=9,
 237         NET_CORE_OPTMEM_MAX=10,
 238         NET_CORE_HOT_LIST_LENGTH=11,
 239         NET_CORE_DIVERT_VERSION=12,
 240         NET_CORE_NO_CONG_THRESH=13,
 241         NET_CORE_NO_CONG=14,
 242         NET_CORE_LO_CONG=15,
 243         NET_CORE_MOD_CONG=16,
 244         NET_CORE_DEV_WEIGHT=17,
 245         NET_CORE_SOMAXCONN=18,
 246 };
 247
 248 /* /proc/sys/net/ethernet */
 249
 250 /* /proc/sys/net/802 */
 251
 252 /* /proc/sys/net/unix */
 253
 254 enum
 255 {
 256         NET_UNIX_DESTROY_DELAY=1,
 257         NET_UNIX_DELETE_DELAY=2,
 258         NET_UNIX_MAX_DGRAM_QLEN=3,
 259 };
 260
 261 /* /proc/sys/net/ipv4 */
 262 enum
 263 {
 264         /* v2.0 compatibile variables */
 265         NET_IPV4_FORWARD=8,
 266         NET_IPV4_DYNADDR=9,
 267
 268         NET_IPV4_CONF=16,
 269         NET_IPV4_NEIGH=17,
 270         NET_IPV4_ROUTE=18,
 271         NET_IPV4_FIB_HASH=19,
 272         NET_IPV4_NETFILTER=20,
 273
 274         NET_IPV4_TCP_TIMESTAMPS=33,
 275         NET_IPV4_TCP_WINDOW_SCALING=34,
 276         NET_IPV4_TCP_SACK=35,
 277         NET_IPV4_TCP_RETRANS_COLLAPSE=36,
 278         NET_IPV4_DEFAULT_TTL=37,
 279         NET_IPV4_AUTOCONFIG=38,
 280         NET_IPV4_NO_PMTU_DISC=39,
 281         NET_IPV4_TCP_SYN_RETRIES=40,
 282         NET_IPV4_IPFRAG_HIGH_THRESH=41,
 283         NET_IPV4_IPFRAG_LOW_THRESH=42,
 284         NET_IPV4_IPFRAG_TIME=43,
 285         NET_IPV4_TCP_MAX_KA_PROBES=44,
 286         NET_IPV4_TCP_KEEPALIVE_TIME=45,
 287         NET_IPV4_TCP_KEEPALIVE_PROBES=46,
 288         NET_IPV4_TCP_RETRIES1=47,
 289         NET_IPV4_TCP_RETRIES2=48,
 290         NET_IPV4_TCP_FIN_TIMEOUT=49,
 291         NET_IPV4_IP_MASQ_DEBUG=50,
 292         NET_TCP_SYNCOOKIES=51,
 293         NET_TCP_STDURG=52,
 294         NET_TCP_RFC1337=53,
 295         NET_TCP_SYN_TAILDROP=54,
 296         NET_TCP_MAX_SYN_BACKLOG=55,
 297         NET_IPV4_LOCAL_PORT_RANGE=56,
 298         NET_IPV4_ICMP_ECHO_IGNORE_ALL=57,
 299         NET_IPV4_ICMP_ECHO_IGNORE_BROADCASTS=58,
 300         NET_IPV4_ICMP_SOURCEQUENCH_RATE=59,
 301         NET_IPV4_ICMP_DESTUNREACH_RATE=60,
 302         NET_IPV4_ICMP_TIMEEXCEED_RATE=61,
 303         NET_IPV4_ICMP_PARAMPROB_RATE=62,
 304         NET_IPV4_ICMP_ECHOREPLY_RATE=63,
 305         NET_IPV4_ICMP_IGNORE_BOGUS_ERROR_RESPONSES=64,
 306         NET_IPV4_IGMP_MAX_MEMBERSHIPS=65,
 307         NET_TCP_TW_RECYCLE=66,
 308         NET_IPV4_ALWAYS_DEFRAG=67,
 309         NET_IPV4_TCP_KEEPALIVE_INTVL=68,
 310         NET_IPV4_INET_PEER_THRESHOLD=69,
 311         NET_IPV4_INET_PEER_MINTTL=70,
 312         NET_IPV4_INET_PEER_MAXTTL=71,
 313         NET_IPV4_INET_PEER_GC_MINTIME=72,
 314         NET_IPV4_INET_PEER_GC_MAXTIME=73,
 315         NET_TCP_ORPHAN_RETRIES=74,
 316         NET_TCP_ABORT_ON_OVERFLOW=75,
 317         NET_TCP_SYNACK_RETRIES=76,
 318         NET_TCP_MAX_ORPHANS=77,
 319         NET_TCP_MAX_TW_BUCKETS=78,
 320         NET_TCP_FACK=79,
 321         NET_TCP_REORDERING=80,
 322         NET_TCP_ECN=81,
 323         NET_TCP_DSACK=82,
 324         NET_TCP_MEM=83,
 325         NET_TCP_WMEM=84,
 326         NET_TCP_RMEM=85,
 327         NET_TCP_APP_WIN=86,
 328         NET_TCP_ADV_WIN_SCALE=87,
 329         NET_IPV4_NONLOCAL_BIND=88,
 330         NET_IPV4_ICMP_RATELIMIT=89,
 331         NET_IPV4_ICMP_RATEMASK=90,
 332         NET_TCP_TW_REUSE=91,
 333         NET_TCP_FRTO=92,
 334         NET_TCP_LOW_LATENCY=93,
 335         NET_IPV4_IPFRAG_SECRET_INTERVAL=94,
 336         NET_TCP_WESTWOOD=95,
 337         NET_IPV4_IGMP_MAX_MSF=96,
 338         NET_TCP_NO_METRICS_SAVE=97,
 339         NET_TCP_VEGAS=98,
 340         NET_TCP_VEGAS_ALPHA=99,
 341         NET_TCP_VEGAS_BETA=100,
 342         NET_TCP_VEGAS_GAMMA=101,
 343         NET_TCP_BIC=102,
 344         NET_TCP_BIC_FAST_CONVERGENCE=103,
 345         NET_TCP_BIC_LOW_WINDOW=104,
 346         NET_TCP_DEFAULT_WIN_SCALE=105,
 347         NET_TCP_MODERATE_RCVBUF=106,
 348         NET_TCP_TSO_WIN_DIVISOR=107,
 349 #ifdef CONFIG_ICMP_IPOD
 350         NET_IPV4_ICMP_IPOD_VERSION,
 351         NET_IPV4_ICMP_IPOD_ENABLED,
 352         NET_IPV4_ICMP_IPOD_HOST,
 353         NET_IPV4_ICMP_IPOD_MASK,
 354         NET_IPV4_ICMP_IPOD_KEY,
 355 #endif
 356 };
 357
 358 enum {
 359         NET_IPV4_ROUTE_FLUSH=1,
 360         NET_IPV4_ROUTE_MIN_DELAY=2,
 361         NET_IPV4_ROUTE_MAX_DELAY=3,
 362         NET_IPV4_ROUTE_GC_THRESH=4,
 363         NET_IPV4_ROUTE_MAX_SIZE=5,
 364         NET_IPV4_ROUTE_GC_MIN_INTERVAL=6,
 365         NET_IPV4_ROUTE_GC_TIMEOUT=7,
 366         NET_IPV4_ROUTE_GC_INTERVAL=8,
 367         NET_IPV4_ROUTE_REDIRECT_LOAD=9,
 368         NET_IPV4_ROUTE_REDIRECT_NUMBER=10,
 369         NET_IPV4_ROUTE_REDIRECT_SILENCE=11,
 370         NET_IPV4_ROUTE_ERROR_COST=12,
 371         NET_IPV4_ROUTE_ERROR_BURST=13,
 372         NET_IPV4_ROUTE_GC_ELASTICITY=14,
 373         NET_IPV4_ROUTE_MTU_EXPIRES=15,
 374         NET_IPV4_ROUTE_MIN_PMTU=16,
 375         NET_IPV4_ROUTE_MIN_ADVMSS=17,
 376         NET_IPV4_ROUTE_SECRET_INTERVAL=18,
 377 };
 378
 379 enum
 380 {
 381         NET_PROTO_CONF_ALL=-2,
 382         NET_PROTO_CONF_DEFAULT=-3
 383
 384         /* And device ifindices ... */
 385 };
 386
 387 enum
 388 {
 389         NET_IPV4_CONF_FORWARDING=1,
 390         NET_IPV4_CONF_MC_FORWARDING=2,
 391         NET_IPV4_CONF_PROXY_ARP=3,
 392         NET_IPV4_CONF_ACCEPT_REDIRECTS=4,
 393         NET_IPV4_CONF_SECURE_REDIRECTS=5,
 394         NET_IPV4_CONF_SEND_REDIRECTS=6,
 395         NET_IPV4_CONF_SHARED_MEDIA=7,
 396         NET_IPV4_CONF_RP_FILTER=8,
 397         NET_IPV4_CONF_ACCEPT_SOURCE_ROUTE=9,
 398         NET_IPV4_CONF_BOOTP_RELAY=10,
 399         NET_IPV4_CONF_LOG_MARTIANS=11,
 400         NET_IPV4_CONF_TAG=12,
 401         NET_IPV4_CONF_ARPFILTER=13,
 402         NET_IPV4_CONF_MEDIUM_ID=14,
 403         NET_IPV4_CONF_NOXFRM=15,
 404         NET_IPV4_CONF_NOPOLICY=16,
 405         NET_IPV4_CONF_FORCE_IGMP_VERSION=17,
 406         NET_IPV4_CONF_ARP_ANNOUNCE=18,
 407         NET_IPV4_CONF_ARP_IGNORE=19,
 408 };
 409
 410 /* /proc/sys/net/ipv4/netfilter */
 411 enum
 412 {
 413         NET_IPV4_NF_CONNTRACK_MAX=1,
 414         NET_IPV4_NF_CONNTRACK_TCP_TIMEOUT_SYN_SENT=2,
 415         NET_IPV4_NF_CONNTRACK_TCP_TIMEOUT_SYN_RECV=3,
 416         NET_IPV4_NF_CONNTRACK_TCP_TIMEOUT_ESTABLISHED=4,
 417         NET_IPV4_NF_CONNTRACK_TCP_TIMEOUT_FIN_WAIT=5,
 418         NET_IPV4_NF_CONNTRACK_TCP_TIMEOUT_CLOSE_WAIT=6,
 419         NET_IPV4_NF_CONNTRACK_TCP_TIMEOUT_LAST_ACK=7,
 420         NET_IPV4_NF_CONNTRACK_TCP_TIMEOUT_TIME_WAIT=8,
 421         NET_IPV4_NF_CONNTRACK_TCP_TIMEOUT_CLOSE=9,
 422         NET_IPV4_NF_CONNTRACK_UDP_TIMEOUT=10,
 423         NET_IPV4_NF_CONNTRACK_UDP_TIMEOUT_STREAM=11,
 424         NET_IPV4_NF_CONNTRACK_ICMP_TIMEOUT=12,
 425         NET_IPV4_NF_CONNTRACK_GENERIC_TIMEOUT=13,
 426         NET_IPV4_NF_CONNTRACK_BUCKETS=14,
 427         NET_IPV4_NF_CONNTRACK_LOG_INVALID=15,
 428         NET_IPV4_NF_CONNTRACK_TCP_TIMEOUT_MAX_RETRANS=16,
 429         NET_IPV4_NF_CONNTRACK_TCP_LOOSE=17,
 430         NET_IPV4_NF_CONNTRACK_TCP_BE_LIBERAL=18,
 431         NET_IPV4_NF_CONNTRACK_TCP_MAX_RETRANS=19,
 432         NET_IPV4_NF_CONNTRACK_SCTP_TIMEOUT_CLOSED=20,
 433         NET_IPV4_NF_CONNTRACK_SCTP_TIMEOUT_COOKIE_WAIT=21,
 434         NET_IPV4_NF_CONNTRACK_SCTP_TIMEOUT_COOKIE_ECHOED=22,
 435         NET_IPV4_NF_CONNTRACK_SCTP_TIMEOUT_ESTABLISHED=23,
 436         NET_IPV4_NF_CONNTRACK_SCTP_TIMEOUT_SHUTDOWN_SENT=24,
 437         NET_IPV4_NF_CONNTRACK_SCTP_TIMEOUT_SHUTDOWN_RECD=25,
 438         NET_IPV4_NF_CONNTRACK_SCTP_TIMEOUT_SHUTDOWN_ACK_SENT=26,
 439         NET_IPV4_NF_CONNTRACK_COUNT=27,
 440 };
 441
 442 /* /proc/sys/net/ipv6 */
 443 enum {
 444         NET_IPV6_CONF=16,
 445         NET_IPV6_NEIGH=17,
 446         NET_IPV6_ROUTE=18,
 447         NET_IPV6_ICMP=19,
 448         NET_IPV6_BINDV6ONLY=20,
 449         NET_IPV6_IP6FRAG_HIGH_THRESH=21,
 450         NET_IPV6_IP6FRAG_LOW_THRESH=22,
 451         NET_IPV6_IP6FRAG_TIME=23,
 452         NET_IPV6_IP6FRAG_SECRET_INTERVAL=24,
 453         NET_IPV6_MLD_MAX_MSF=25,
 454 };
 455
 456 enum {
 457         NET_IPV6_ROUTE_FLUSH=1,
 458         NET_IPV6_ROUTE_GC_THRESH=2,
 459         NET_IPV6_ROUTE_MAX_SIZE=3,
 460         NET_IPV6_ROUTE_GC_MIN_INTERVAL=4,
 461         NET_IPV6_ROUTE_GC_TIMEOUT=5,
 462         NET_IPV6_ROUTE_GC_INTERVAL=6,
 463         NET_IPV6_ROUTE_GC_ELASTICITY=7,
 464         NET_IPV6_ROUTE_MTU_EXPIRES=8,
 465         NET_IPV6_ROUTE_MIN_ADVMSS=9
 466 };
 467
 468 enum {
 469         NET_IPV6_FORWARDING=1,
 470         NET_IPV6_HOP_LIMIT=2,
 471         NET_IPV6_MTU=3,
 472         NET_IPV6_ACCEPT_RA=4,
 473         NET_IPV6_ACCEPT_REDIRECTS=5,
 474         NET_IPV6_AUTOCONF=6,
 475         NET_IPV6_DAD_TRANSMITS=7,
 476         NET_IPV6_RTR_SOLICITS=8,
 477         NET_IPV6_RTR_SOLICIT_INTERVAL=9,
 478         NET_IPV6_RTR_SOLICIT_DELAY=10,
 479         NET_IPV6_USE_TEMPADDR=11,
 480         NET_IPV6_TEMP_VALID_LFT=12,
 481         NET_IPV6_TEMP_PREFERED_LFT=13,
 482         NET_IPV6_REGEN_MAX_RETRY=14,
 483         NET_IPV6_MAX_DESYNC_FACTOR=15,
 484         NET_IPV6_MAX_ADDRESSES=16,
 485         NET_IPV6_FORCE_MLD_VERSION=17
 486 };
 487
 488 /* /proc/sys/net/ipv6/icmp */
 489 enum {
 490         NET_IPV6_ICMP_RATELIMIT=1
 491 };
 492
 493 /* /proc/sys/net/<protocol>/neigh/<dev> */
 494 enum {
 495         NET_NEIGH_MCAST_SOLICIT=1,
 496         NET_NEIGH_UCAST_SOLICIT=2,
 497         NET_NEIGH_APP_SOLICIT=3,
 498         NET_NEIGH_RETRANS_TIME=4,
 499         NET_NEIGH_REACHABLE_TIME=5,
 500         NET_NEIGH_DELAY_PROBE_TIME=6,
 501         NET_NEIGH_GC_STALE_TIME=7,
 502         NET_NEIGH_UNRES_QLEN=8,
 503         NET_NEIGH_PROXY_QLEN=9,
 504         NET_NEIGH_ANYCAST_DELAY=10,
 505         NET_NEIGH_PROXY_DELAY=11,
 506         NET_NEIGH_LOCKTIME=12,
 507         NET_NEIGH_GC_INTERVAL=13,
 508         NET_NEIGH_GC_THRESH1=14,
 509         NET_NEIGH_GC_THRESH2=15,
 510         NET_NEIGH_GC_THRESH3=16
 511 };
 512
 513 /* /proc/sys/net/ipx */
 514 enum {
 515         NET_IPX_PPROP_BROADCASTING=1,
 516         NET_IPX_FORWARDING=2
 517 };
 518
 519
 520 /* /proc/sys/net/appletalk */
 521 enum {
 522         NET_ATALK_AARP_EXPIRY_TIME=1,
 523         NET_ATALK_AARP_TICK_TIME=2,
 524         NET_ATALK_AARP_RETRANSMIT_LIMIT=3,
 525         NET_ATALK_AARP_RESOLVE_TIME=4
 526 };
 527
 528
 529 /* /proc/sys/net/netrom */
 530 enum {
 531         NET_NETROM_DEFAULT_PATH_QUALITY=1,
 532         NET_NETROM_OBSOLESCENCE_COUNT_INITIALISER=2,
 533         NET_NETROM_NETWORK_TTL_INITIALISER=3,
 534         NET_NETROM_TRANSPORT_TIMEOUT=4,
 535         NET_NETROM_TRANSPORT_MAXIMUM_TRIES=5,
 536         NET_NETROM_TRANSPORT_ACKNOWLEDGE_DELAY=6,
 537         NET_NETROM_TRANSPORT_BUSY_DELAY=7,
 538         NET_NETROM_TRANSPORT_REQUESTED_WINDOW_SIZE=8,
 539         NET_NETROM_TRANSPORT_NO_ACTIVITY_TIMEOUT=9,
 540         NET_NETROM_ROUTING_CONTROL=10,
 541         NET_NETROM_LINK_FAILS_COUNT=11
 542 };
 543
 544 /* /proc/sys/net/ax25 */
 545 enum {
 546         NET_AX25_IP_DEFAULT_MODE=1,
 547         NET_AX25_DEFAULT_MODE=2,
 548         NET_AX25_BACKOFF_TYPE=3,
 549         NET_AX25_CONNECT_MODE=4,
 550         NET_AX25_STANDARD_WINDOW=5,
 551         NET_AX25_EXTENDED_WINDOW=6,
 552         NET_AX25_T1_TIMEOUT=7,
 553         NET_AX25_T2_TIMEOUT=8,
 554         NET_AX25_T3_TIMEOUT=9,
 555         NET_AX25_IDLE_TIMEOUT=10,
 556         NET_AX25_N2=11,
 557         NET_AX25_PACLEN=12,
 558         NET_AX25_PROTOCOL=13,
 559         NET_AX25_DAMA_SLAVE_TIMEOUT=14
 560 };
 561
 562 /* /proc/sys/net/rose */
 563 enum {
 564         NET_ROSE_RESTART_REQUEST_TIMEOUT=1,
 565         NET_ROSE_CALL_REQUEST_TIMEOUT=2,
 566         NET_ROSE_RESET_REQUEST_TIMEOUT=3,
 567         NET_ROSE_CLEAR_REQUEST_TIMEOUT=4,
 568         NET_ROSE_ACK_HOLD_BACK_TIMEOUT=5,
 569         NET_ROSE_ROUTING_CONTROL=6,
 570         NET_ROSE_LINK_FAIL_TIMEOUT=7,
 571         NET_ROSE_MAX_VCS=8,
 572         NET_ROSE_WINDOW_SIZE=9,
 573         NET_ROSE_NO_ACTIVITY_TIMEOUT=10
 574 };
 575
 576 /* /proc/sys/net/x25 */
 577 enum {
 578         NET_X25_RESTART_REQUEST_TIMEOUT=1,
 579         NET_X25_CALL_REQUEST_TIMEOUT=2,
 580         NET_X25_RESET_REQUEST_TIMEOUT=3,
 581         NET_X25_CLEAR_REQUEST_TIMEOUT=4,
 582         NET_X25_ACK_HOLD_BACK_TIMEOUT=5
 583 };
 584
 585 /* /proc/sys/net/token-ring */
 586 enum
 587 {
 588         NET_TR_RIF_TIMEOUT=1
 589 };
 590
 591 /* /proc/sys/net/decnet/ */
 592 enum {
 593         NET_DECNET_NODE_TYPE = 1,
 594         NET_DECNET_NODE_ADDRESS = 2,
 595         NET_DECNET_NODE_NAME = 3,
 596         NET_DECNET_DEFAULT_DEVICE = 4,
 597         NET_DECNET_TIME_WAIT = 5,
 598         NET_DECNET_DN_COUNT = 6,
 599         NET_DECNET_DI_COUNT = 7,
 600         NET_DECNET_DR_COUNT = 8,
 601         NET_DECNET_DST_GC_INTERVAL = 9,
 602         NET_DECNET_CONF = 10,
 603         NET_DECNET_NO_FC_MAX_CWND = 11,
 604         NET_DECNET_DEBUG_LEVEL = 255
 605 };
 606
 607 /* /proc/sys/net/decnet/conf/<dev> */
 608 enum {
 609         NET_DECNET_CONF_LOOPBACK = -2,
 610         NET_DECNET_CONF_DDCMP = -3,
 611         NET_DECNET_CONF_PPP = -4,
 612         NET_DECNET_CONF_X25 = -5,
 613         NET_DECNET_CONF_GRE = -6,
 614         NET_DECNET_CONF_ETHER = -7
 615
 616         /* ... and ifindex of devices */
 617 };
 618
 619 /* /proc/sys/net/decnet/conf/<dev>/ */
 620 enum {
 621         NET_DECNET_CONF_DEV_PRIORITY = 1,
 622         NET_DECNET_CONF_DEV_T1 = 2,
 623         NET_DECNET_CONF_DEV_T2 = 3,
 624         NET_DECNET_CONF_DEV_T3 = 4,
 625         NET_DECNET_CONF_DEV_FORWARDING = 5,
 626         NET_DECNET_CONF_DEV_BLKSIZE = 6,
 627         NET_DECNET_CONF_DEV_STATE = 7
 628 };
 629
 630 /* /proc/sys/net/sctp */
 631 enum {
 632         NET_SCTP_RTO_INITIAL = 1,
 633         NET_SCTP_RTO_MIN     = 2,
 634         NET_SCTP_RTO_MAX     = 3,
 635         NET_SCTP_RTO_ALPHA   = 4,
 636         NET_SCTP_RTO_BETA    = 5,
 637         NET_SCTP_VALID_COOKIE_LIFE       =  6,
 638         NET_SCTP_ASSOCIATION_MAX_RETRANS =  7,
 639         NET_SCTP_PATH_MAX_RETRANS        =  8,
 640         NET_SCTP_MAX_INIT_RETRANSMITS    =  9,
 641         NET_SCTP_HB_INTERVAL             = 10,
 642         NET_SCTP_PRESERVE_ENABLE         = 11,
 643         NET_SCTP_MAX_BURST               = 12,
 644         NET_SCTP_ADDIP_ENABLE            = 13,
 645         NET_SCTP_PRSCTP_ENABLE           = 14,
 646 };
 647
 648 /* /proc/sys/net/bridge */
 649 enum {
 650         NET_BRIDGE_NF_CALL_ARPTABLES = 1,
 651         NET_BRIDGE_NF_CALL_IPTABLES = 2,
 652         NET_BRIDGE_NF_CALL_IP6TABLES = 3,
 653         NET_BRIDGE_NF_FILTER_VLAN_TAGGED = 4,
 654 };
 655
 656 /* /proc/sys/net/tux/ */
 657 enum {
 658         NET_TUX_DOCROOT                 =  1,
 659         NET_TUX_LOGFILE                 =  2,
 660         NET_TUX_EXTCGI                  =  3,
 661         NET_TUX_STOP                    =  4,
 662         NET_TUX_CLIENTPORT              =  5,
 663         NET_TUX_LOGGING                 =  6,
 664         NET_TUX_SERVERPORT              =  7,
 665         NET_TUX_THREADS                 =  8,
 666         NET_TUX_KEEPALIVE_TIMEOUT       =  9,
 667         NET_TUX_MAX_KEEPALIVE_BW        = 10,
 668         NET_TUX_DEFER_ACCEPT            = 11,
 669         NET_TUX_MAX_FREE_REQUESTS       = 12,
 670         NET_TUX_MAX_CONNECT             = 13,
 671         NET_TUX_MAX_BACKLOG             = 14,
 672         NET_TUX_MODE_FORBIDDEN          = 15,
 673         NET_TUX_MODE_ALLOWED            = 16,
 674         NET_TUX_MODE_USERSPACE          = 17,
 675         NET_TUX_MODE_CGI                = 18,
 676         NET_TUX_CGI_UID                 = 19,
 677         NET_TUX_CGI_GID                 = 20,
 678         NET_TUX_CGIROOT                 = 21,
 679         NET_TUX_LOGENTRY_ALIGN_ORDER    = 22,
 680         NET_TUX_NONAGLE                 = 23,
 681         NET_TUX_ACK_PINGPONG            = 24,
 682         NET_TUX_PUSH_ALL                = 25,
 683         NET_TUX_ZEROCOPY_PARSE          = 26,
 684         NET_CONFIG_TUX_DEBUG_BLOCKING   = 27,
 685         NET_TUX_PAGE_AGE_START          = 28,
 686         NET_TUX_PAGE_AGE_ADV            = 29,
 687         NET_TUX_PAGE_AGE_MAX            = 30,
 688         NET_TUX_VIRTUAL_SERVER          = 31,
 689         NET_TUX_MAX_OBJECT_SIZE         = 32,
 690         NET_TUX_COMPRESSION             = 33,
 691         NET_TUX_NOID                    = 34,
 692         NET_TUX_CGI_INHERIT_CPU         = 35,
 693         NET_TUX_CGI_CPU_MASK            = 36,
 694         NET_TUX_ZEROCOPY_HEADER         = 37,
 695         NET_TUX_ZEROCOPY_SENDFILE       = 38,
 696         NET_TUX_ALL_USERSPACE           = 39,
 697         NET_TUX_REDIRECT_LOGGING        = 40,
 698         NET_TUX_REFERER_LOGGING         = 41,
 699         NET_TUX_MAX_HEADER_LEN          = 42,
 700         NET_TUX_404_PAGE                = 43,
 701         NET_TUX_MAX_KEEPALIVES          = 44,
 702         NET_TUX_IGNORE_QUERY            = 45,
 703 };
 704
 705 /* CTL_PROC names: */
 706
 707 /* CTL_FS names: */
 708 enum
 709 {
 710         FS_NRINODE=1,   /* int:current number of allocated inodes */
 711         FS_STATINODE=2,
 712         FS_MAXINODE=3,  /* int:maximum number of inodes that can be allocated */
 713         FS_NRDQUOT=4,   /* int:current number of allocated dquots */
 714         FS_MAXDQUOT=5,  /* int:maximum number of dquots that can be allocated */
 715         FS_NRFILE=6,    /* int:current number of allocated filedescriptors */
 716         FS_MAXFILE=7,   /* int:maximum number of filedescriptors that can be allocated */
 717         FS_DENTRY=8,
 718         FS_NRSUPER=9,   /* int:current number of allocated super_blocks */
 719         FS_MAXSUPER=10, /* int:maximum number of super_blocks that can be allocated */
 720         FS_OVERFLOWUID=11,      /* int: overflow UID */
 721         FS_OVERFLOWGID=12,      /* int: overflow GID */
 722         FS_LEASES=13,   /* int: leases enabled */
 723         FS_DIR_NOTIFY=14,       /* int: directory notification enabled */
 724         FS_LEASE_TIME=15,       /* int: maximum time to wait for a lease break */
 725         FS_DQSTATS=16,  /* disc quota usage statistics */
 726         FS_XFS=17,      /* struct: control xfs parameters */
 727         FS_AIO_NR=18,   /* current system-wide number of aio requests */
 728         FS_AIO_MAX_NR=19,       /* system-wide maximum number of aio requests */
 729 };
 730
 731 /* /proc/sys/fs/quota/ */
 732 enum {
 733         FS_DQ_LOOKUPS = 1,
 734         FS_DQ_DROPS = 2,
 735         FS_DQ_READS = 3,
 736         FS_DQ_WRITES = 4,
 737         FS_DQ_CACHE_HITS = 5,
 738         FS_DQ_ALLOCATED = 6,
 739         FS_DQ_FREE = 7,
 740         FS_DQ_SYNCS = 8,
 741 };
 742
 743 /* CTL_DEBUG names: */
 744
 745 /* CTL_DEV names: */
 746 enum {
 747         DEV_CDROM=1,
 748         DEV_HWMON=2,
 749         DEV_PARPORT=3,
 750         DEV_RAID=4,
 751         DEV_MAC_HID=5,
 752         DEV_SCSI=6,
 753 };
 754
 755 /* /proc/sys/dev/cdrom */
 756 enum {
 757         DEV_CDROM_INFO=1,
 758         DEV_CDROM_AUTOCLOSE=2,
 759         DEV_CDROM_AUTOEJECT=3,
 760         DEV_CDROM_DEBUG=4,
 761         DEV_CDROM_LOCK=5,
 762         DEV_CDROM_CHECK_MEDIA=6
 763 };
 764
 765 /* /proc/sys/dev/parport */
 766 enum {
 767         DEV_PARPORT_DEFAULT=-3
 768 };
 769
 770 /* /proc/sys/dev/raid */
 771 enum {
 772         DEV_RAID_SPEED_LIMIT_MIN=1,
 773         DEV_RAID_SPEED_LIMIT_MAX=2
 774 };
 775
 776 /* /proc/sys/dev/parport/default */
 777 enum {
 778         DEV_PARPORT_DEFAULT_TIMESLICE=1,
 779         DEV_PARPORT_DEFAULT_SPINTIME=2
 780 };
 781
 782 /* /proc/sys/dev/parport/parport n */
 783 enum {
 784         DEV_PARPORT_SPINTIME=1,
 785         DEV_PARPORT_BASE_ADDR=2,
 786         DEV_PARPORT_IRQ=3,
 787         DEV_PARPORT_DMA=4,
 788         DEV_PARPORT_MODES=5,
 789         DEV_PARPORT_DEVICES=6,
 790         DEV_PARPORT_AUTOPROBE=16
 791 };
 792
 793 /* /proc/sys/dev/parport/parport n/devices/ */
 794 enum {
 795         DEV_PARPORT_DEVICES_ACTIVE=-3,
 796 };
 797
 798 /* /proc/sys/dev/parport/parport n/devices/device n */
 799 enum {
 800         DEV_PARPORT_DEVICE_TIMESLICE=1,
 801 };
 802
 803 /* /proc/sys/dev/mac_hid */
 804 enum {
 805         DEV_MAC_HID_KEYBOARD_SENDS_LINUX_KEYCODES=1,
 806         DEV_MAC_HID_KEYBOARD_LOCK_KEYCODES=2,
 807         DEV_MAC_HID_MOUSE_BUTTON_EMULATION=3,
 808         DEV_MAC_HID_MOUSE_BUTTON2_KEYCODE=4,
 809         DEV_MAC_HID_MOUSE_BUTTON3_KEYCODE=5,
 810         DEV_MAC_HID_ADB_MOUSE_SENDS_KEYCODES=6
 811 };
 812
 813 /* /proc/sys/dev/scsi */
 814 enum {
 815         DEV_SCSI_LOGGING_LEVEL=1,
 816 };
 817
 818 /* /proc/sys/abi */
 819 enum
 820 {
 821         ABI_DEFHANDLER_COFF=1,  /* default handler for coff binaries */
 822         ABI_DEFHANDLER_ELF=2,   /* default handler for ELF binaries */
 823         ABI_DEFHANDLER_LCALL7=3,/* default handler for procs using lcall7 */
 824         ABI_DEFHANDLER_LIBCSO=4,/* default handler for an libc.so ELF interp */
 825         ABI_TRACE=5,            /* tracing flags */
 826         ABI_FAKE_UTSNAME=6,     /* fake target utsname information */
 827 };
 828
 829 #ifdef __KERNEL__
 830
 831 extern void sysctl_init(void);
 832
 833 typedef struct ctl_table ctl_table;
 834
 835 typedef int ctl_handler (ctl_table *table, int __user *name, int nlen,
 836                          void __user *oldval, size_t __user *oldlenp,
 837                          void __user *newval, size_t newlen,
 838                          void **context);
 839
 840 typedef int proc_handler (ctl_table *ctl, int write, struct file * filp,
 841                           void __user *buffer, size_t *lenp, loff_t *ppos);
 842
 843 extern int proc_dostring(ctl_table *, int, struct file *,
 844                          void __user *, size_t *, loff_t *);
 845 extern int proc_dointvec(ctl_table *, int, struct file *,
 846                          void __user *, size_t *, loff_t *);
 847 extern int proc_dointvec_bset(ctl_table *, int, struct file *,
 848                               void __user *, size_t *, loff_t *);
 849 extern int proc_dointvec_minmax(ctl_table *, int, struct file *,
 850                                 void __user *, size_t *, loff_t *);
 851 extern int proc_dointvec_jiffies(ctl_table *, int, struct file *,
 852                                  void __user *, size_t *, loff_t *);
 853 extern int proc_dointvec_userhz_jiffies(ctl_table *, int, struct file *,
 854                                         void __user *, size_t *, loff_t *);
 855 extern int proc_doulongvec_minmax(ctl_table *, int, struct file *,
 856                                   void __user *, size_t *, loff_t *);
 857 extern int proc_doulongvec_ms_jiffies_minmax(ctl_table *table, int,
 858                                       struct file *, void __user *, size_t *, loff_t *);
 859
 860 extern int do_sysctl (int __user *name, int nlen,
 861                       void __user *oldval, size_t __user *oldlenp,
 862                       void __user *newval, size_t newlen);
 863
 864 extern int do_sysctl_strategy (ctl_table *table,
 865                                int __user *name, int nlen,
 866                                void __user *oldval, size_t __user *oldlenp,
 867                                void __user *newval, size_t newlen, void ** context);
 868
 869 extern ctl_handler sysctl_string;
 870 extern ctl_handler sysctl_intvec;
 871 extern ctl_handler sysctl_jiffies;
 872
 873
 874 /*
 875  * Register a set of sysctl names by calling register_sysctl_table
 876  * with an initialised array of ctl_table's.  An entry with zero
 877  * ctl_name terminates the table.  table->de will be set up by the
 878  * registration and need not be initialised in advance.
 879  *
 880  * sysctl names can be mirrored automatically under /proc/sys.  The
 881  * procname supplied controls /proc naming.
 882  *
 883  * The table's mode will be honoured both for sys_sysctl(2) and
 884  * proc-fs access.
 885  *
 886  * Leaf nodes in the sysctl tree will be represented by a single file
 887  * under /proc; non-leaf nodes will be represented by directories.  A
 888  * null procname disables /proc mirroring at this node.
 889  *
 890  * sysctl(2) can automatically manage read and write requests through
 891  * the sysctl table.  The data and maxlen fields of the ctl_table
 892  * struct enable minimal validation of the values being written to be
 893  * performed, and the mode field allows minimal authentication.
 894  *
 895  * More sophisticated management can be enabled by the provision of a
 896  * strategy routine with the table entry.  This will be called before
 897  * any automatic read or write of the data is performed.
 898  *
 899  * The strategy routine may return:
 900  * <0: Error occurred (error is passed to user process)
 901  * 0:  OK - proceed with automatic read or write.
 902  * >0: OK - read or write has been done by the strategy routine, so
 903  *     return immediately.
 904  *
 905  * There must be a proc_handler routine for any terminal nodes
 906  * mirrored under /proc/sys (non-terminals are handled by a built-in
 907  * directory handler).  Several default handlers are available to
 908  * cover common cases.
 909  */
 910
 911 /* A sysctl table is an array of struct ctl_table: */
 912 struct ctl_table
 913 {
 914         int ctl_name;                   /* Binary ID */
 915         const char *procname;           /* Text ID for /proc/sys, or zero */
 916         void *data;
 917         int maxlen;
 918         mode_t mode;
 919         ctl_table *child;
 920         proc_handler *proc_handler;     /* Callback for text formatting */
 921         ctl_handler *strategy;          /* Callback function for all r/w */
 922         struct proc_dir_entry *de;      /* /proc control block */
 923         void *extra1;
 924         void *extra2;
 925 };
 926
 927 /* struct ctl_table_header is used to maintain dynamic lists of
 928    ctl_table trees. */
 929 struct ctl_table_header
 930 {
 931         ctl_table *ctl_table;
 932         struct list_head ctl_entry;
 933 };
 934
 935 struct ctl_table_header * register_sysctl_table(ctl_table * table,
 936                                                 int insert_at_head);
 937 void unregister_sysctl_table(struct ctl_table_header * table);
 938
 939 #else /* __KERNEL__ */
 940
 941 #endif /* __KERNEL__ */
 942
 943 #endif /* _LINUX_SYSCTL_H */