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[linux-block.git] / include / linux / sysctl.h
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1da177e4
LT		 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>
1da177e4
LT		 23#include <linux/compiler.h>
24
25struct file;
330d57fb 26struct completion;
1da177e4
LT		 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
33struct __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
53enum
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 */
0399cb08 64 CTL_CPU=10 /* CPU stuff (speed scaling, etc) */
1da177e4
LT		 65};
66
67/* CTL_BUS names: */
68enum
69{
70 CTL_BUS_ISA=1 /* ISA */
71};
72
0399cb08 73/* /proc/sys/fs/inotify/ */
0eeca283
RL		 74enum
75{
0399cb08
RL		 76 INOTIFY_MAX_USER_INSTANCES=1, /* max instances per user */
77 INOTIFY_MAX_USER_WATCHES=2, /* max watches per user */
78 INOTIFY_MAX_QUEUED_EVENTS=3 /* max queued events per instance */
0eeca283
RL		 79};
80
1da177e4
LT		 81/* CTL_KERN names: */
82enum
83{
84 KERN_OSTYPE=1, /* string: system version */
85 KERN_OSRELEASE=2, /* string: system release */
86 KERN_OSREV=3, /* int: system revision */
87 KERN_VERSION=4, /* string: compile time info */
88 KERN_SECUREMASK=5, /* struct: maximum rights mask */
89 KERN_PROF=6, /* table: profiling information */
90 KERN_NODENAME=7,
91 KERN_DOMAINNAME=8,
92
93 KERN_CAP_BSET=14, /* int: capability bounding set */
94 KERN_PANIC=15, /* int: panic timeout */
95 KERN_REALROOTDEV=16, /* real root device to mount after initrd */
96
97 KERN_SPARC_REBOOT=21, /* reboot command on Sparc */
98 KERN_CTLALTDEL=22, /* int: allow ctl-alt-del to reboot */
99 KERN_PRINTK=23, /* struct: control printk logging parameters */
100 KERN_NAMETRANS=24, /* Name translation */
101 KERN_PPC_HTABRECLAIM=25, /* turn htab reclaimation on/off on PPC */
102 KERN_PPC_ZEROPAGED=26, /* turn idle page zeroing on/off on PPC */
103 KERN_PPC_POWERSAVE_NAP=27, /* use nap mode for power saving */
104 KERN_MODPROBE=28,
105 KERN_SG_BIG_BUFF=29,
106 KERN_ACCT=30, /* BSD process accounting parameters */
107 KERN_PPC_L2CR=31, /* l2cr register on PPC */
108
109 KERN_RTSIGNR=32, /* Number of rt sigs queued */
110 KERN_RTSIGMAX=33, /* Max queuable */
111
112 KERN_SHMMAX=34, /* long: Maximum shared memory segment */
113 KERN_MSGMAX=35, /* int: Maximum size of a messege */
114 KERN_MSGMNB=36, /* int: Maximum message queue size */
115 KERN_MSGPOOL=37, /* int: Maximum system message pool size */
116 KERN_SYSRQ=38, /* int: Sysreq enable */
117 KERN_MAX_THREADS=39, /* int: Maximum nr of threads in the system */
118 KERN_RANDOM=40, /* Random driver */
119 KERN_SHMALL=41, /* int: Maximum size of shared memory */
120 KERN_MSGMNI=42, /* int: msg queue identifiers */
121 KERN_SEM=43, /* struct: sysv semaphore limits */
122 KERN_SPARC_STOP_A=44, /* int: Sparc Stop-A enable */
123 KERN_SHMMNI=45, /* int: shm array identifiers */
124 KERN_OVERFLOWUID=46, /* int: overflow UID */
125 KERN_OVERFLOWGID=47, /* int: overflow GID */
126 KERN_SHMPATH=48, /* string: path to shm fs */
312c004d 127 KERN_HOTPLUG=49, /* string: path to uevent helper (deprecated) */
1da177e4
LT		 128 KERN_IEEE_EMULATION_WARNINGS=50, /* int: unimplemented ieee instructions */
129 KERN_S390_USER_DEBUG_LOGGING=51, /* int: dumps of user faults */
130 KERN_CORE_USES_PID=52, /* int: use core or core.%pid */
131 KERN_TAINTED=53, /* int: various kernel tainted flags */
132 KERN_CADPID=54, /* int: PID of the process to notify on CAD */
133 KERN_PIDMAX=55, /* int: PID # limit */
134 KERN_CORE_PATTERN=56, /* string: pattern for core-file names */
135 KERN_PANIC_ON_OOPS=57, /* int: whether we will panic on an oops */
136 KERN_HPPA_PWRSW=58, /* int: hppa soft-power enable */
137 KERN_HPPA_UNALIGNED=59, /* int: hppa unaligned-trap enable */
138 KERN_PRINTK_RATELIMIT=60, /* int: tune printk ratelimiting */
139 KERN_PRINTK_RATELIMIT_BURST=61, /* int: tune printk ratelimiting */
140 KERN_PTY=62, /* dir: pty driver */
141 KERN_NGROUPS_MAX=63, /* int: NGROUPS_MAX */
142 KERN_SPARC_SCONS_PWROFF=64, /* int: serial console power-off halt */
143 KERN_HZ_TIMER=65, /* int: hz timer on or off */
144 KERN_UNKNOWN_NMI_PANIC=66, /* int: unknown nmi panic flag */
145 KERN_BOOTLOADER_TYPE=67, /* int: boot loader type */
146 KERN_RANDOMIZE=68, /* int: randomize virtual address space */
d6e71144 147 KERN_SETUID_DUMPABLE=69, /* int: behaviour of dumps for setuid core */
951f22d5 148 KERN_SPIN_RETRY=70, /* int: number of spinlock retries */
1da177e4
LT		 149};
150
151
152/* CTL_VM names: */
153enum
154{
155 VM_UNUSED1=1, /* was: struct: Set vm swapping control */
156 VM_UNUSED2=2, /* was; int: Linear or sqrt() swapout for hogs */
157 VM_UNUSED3=3, /* was: struct: Set free page thresholds */
158 VM_UNUSED4=4, /* Spare */
159 VM_OVERCOMMIT_MEMORY=5, /* Turn off the virtual memory safety limit */
160 VM_UNUSED5=6, /* was: struct: Set buffer memory thresholds */
161 VM_UNUSED7=7, /* was: struct: Set cache memory thresholds */
162 VM_UNUSED8=8, /* was: struct: Control kswapd behaviour */
163 VM_UNUSED9=9, /* was: struct: Set page table cache parameters */
164 VM_PAGE_CLUSTER=10, /* int: set number of pages to swap together */
165 VM_DIRTY_BACKGROUND=11, /* dirty_background_ratio */
166 VM_DIRTY_RATIO=12, /* dirty_ratio */
167 VM_DIRTY_WB_CS=13, /* dirty_writeback_centisecs */
168 VM_DIRTY_EXPIRE_CS=14, /* dirty_expire_centisecs */
169 VM_NR_PDFLUSH_THREADS=15, /* nr_pdflush_threads */
170 VM_OVERCOMMIT_RATIO=16, /* percent of RAM to allow overcommit in */
171 VM_PAGEBUF=17, /* struct: Control pagebuf parameters */
172 VM_HUGETLB_PAGES=18, /* int: Number of available Huge Pages */
173 VM_SWAPPINESS=19, /* Tendency to steal mapped memory */
174 VM_LOWMEM_RESERVE_RATIO=20,/* reservation ratio for lower memory zones */
175 VM_MIN_FREE_KBYTES=21, /* Minimum free kilobytes to maintain */
176 VM_MAX_MAP_COUNT=22, /* int: Maximum number of mmaps/address-space */
177 VM_LAPTOP_MODE=23, /* vm laptop mode */
178 VM_BLOCK_DUMP=24, /* block dump mode */
179 VM_HUGETLB_GROUP=25, /* permitted hugetlb group */
180 VM_VFS_CACHE_PRESSURE=26, /* dcache/icache reclaim pressure */
181 VM_LEGACY_VA_LAYOUT=27, /* legacy/compatibility virtual address space layout */
182 VM_SWAP_TOKEN_TIMEOUT=28, /* default time for token time out */
9d0243bc 183 VM_DROP_PAGECACHE=29, /* int: nuke lots of pagecache */
8ad4b1fb 184 VM_PERCPU_PAGELIST_FRACTION=30,/* int: fraction of pages in each percpu_pagelist */
1da177e4
LT		 185};
186
187
188/* CTL_NET names: */
189enum
190{
191 NET_CORE=1,
192 NET_ETHER=2,
193 NET_802=3,
194 NET_UNIX=4,
195 NET_IPV4=5,
196 NET_IPX=6,
197 NET_ATALK=7,
198 NET_NETROM=8,
199 NET_AX25=9,
200 NET_BRIDGE=10,
201 NET_ROSE=11,
202 NET_IPV6=12,
203 NET_X25=13,
204 NET_TR=14,
205 NET_DECNET=15,
206 NET_ECONET=16,
590232a7
ACM		 207 NET_SCTP=17,
208 NET_LLC=18,
9fb9cbb1 209 NET_NETFILTER=19,
1da177e4
LT		 210};
211
212/* /proc/sys/kernel/random */
213enum
214{
215 RANDOM_POOLSIZE=1,
216 RANDOM_ENTROPY_COUNT=2,
217 RANDOM_READ_THRESH=3,
218 RANDOM_WRITE_THRESH=4,
219 RANDOM_BOOT_ID=5,
220 RANDOM_UUID=6
221};
222
223/* /proc/sys/kernel/pty */
224enum
225{
226 PTY_MAX=1,
227 PTY_NR=2
228};
229
230/* /proc/sys/bus/isa */
231enum
232{
233 BUS_ISA_MEM_BASE=1,
234 BUS_ISA_PORT_BASE=2,
235 BUS_ISA_PORT_SHIFT=3
236};
237
238/* /proc/sys/net/core */
239enum
240{
241 NET_CORE_WMEM_MAX=1,
242 NET_CORE_RMEM_MAX=2,
243 NET_CORE_WMEM_DEFAULT=3,
244 NET_CORE_RMEM_DEFAULT=4,
245/* was NET_CORE_DESTROY_DELAY */
246 NET_CORE_MAX_BACKLOG=6,
247 NET_CORE_FASTROUTE=7,
248 NET_CORE_MSG_COST=8,
249 NET_CORE_MSG_BURST=9,
250 NET_CORE_OPTMEM_MAX=10,
251 NET_CORE_HOT_LIST_LENGTH=11,
252 NET_CORE_DIVERT_VERSION=12,
253 NET_CORE_NO_CONG_THRESH=13,
254 NET_CORE_NO_CONG=14,
255 NET_CORE_LO_CONG=15,
256 NET_CORE_MOD_CONG=16,
257 NET_CORE_DEV_WEIGHT=17,
258 NET_CORE_SOMAXCONN=18,
51b0bded 259 NET_CORE_BUDGET=19,
1da177e4
LT		 260};
261
262/* /proc/sys/net/ethernet */
263
264/* /proc/sys/net/802 */
265
266/* /proc/sys/net/unix */
267
268enum
269{
270 NET_UNIX_DESTROY_DELAY=1,
271 NET_UNIX_DELETE_DELAY=2,
272 NET_UNIX_MAX_DGRAM_QLEN=3,
273};
274
9fb9cbb1
YK		 275/* /proc/sys/net/netfilter */
276enum
277{
278 NET_NF_CONNTRACK_MAX=1,
279 NET_NF_CONNTRACK_TCP_TIMEOUT_SYN_SENT=2,
280 NET_NF_CONNTRACK_TCP_TIMEOUT_SYN_RECV=3,
281 NET_NF_CONNTRACK_TCP_TIMEOUT_ESTABLISHED=4,
282 NET_NF_CONNTRACK_TCP_TIMEOUT_FIN_WAIT=5,
283 NET_NF_CONNTRACK_TCP_TIMEOUT_CLOSE_WAIT=6,
284 NET_NF_CONNTRACK_TCP_TIMEOUT_LAST_ACK=7,
285 NET_NF_CONNTRACK_TCP_TIMEOUT_TIME_WAIT=8,
286 NET_NF_CONNTRACK_TCP_TIMEOUT_CLOSE=9,
287 NET_NF_CONNTRACK_UDP_TIMEOUT=10,
288 NET_NF_CONNTRACK_UDP_TIMEOUT_STREAM=11,
289 NET_NF_CONNTRACK_ICMP_TIMEOUT=12,
290 NET_NF_CONNTRACK_GENERIC_TIMEOUT=13,
291 NET_NF_CONNTRACK_BUCKETS=14,
292 NET_NF_CONNTRACK_LOG_INVALID=15,
293 NET_NF_CONNTRACK_TCP_TIMEOUT_MAX_RETRANS=16,
294 NET_NF_CONNTRACK_TCP_LOOSE=17,
295 NET_NF_CONNTRACK_TCP_BE_LIBERAL=18,
296 NET_NF_CONNTRACK_TCP_MAX_RETRANS=19,
297 NET_NF_CONNTRACK_SCTP_TIMEOUT_CLOSED=20,
298 NET_NF_CONNTRACK_SCTP_TIMEOUT_COOKIE_WAIT=21,
299 NET_NF_CONNTRACK_SCTP_TIMEOUT_COOKIE_ECHOED=22,
300 NET_NF_CONNTRACK_SCTP_TIMEOUT_ESTABLISHED=23,
301 NET_NF_CONNTRACK_SCTP_TIMEOUT_SHUTDOWN_SENT=24,
302 NET_NF_CONNTRACK_SCTP_TIMEOUT_SHUTDOWN_RECD=25,
303 NET_NF_CONNTRACK_SCTP_TIMEOUT_SHUTDOWN_ACK_SENT=26,
304 NET_NF_CONNTRACK_COUNT=27,
305 NET_NF_CONNTRACK_ICMPV6_TIMEOUT=28,
306 NET_NF_CONNTRACK_FRAG6_TIMEOUT=29,
307 NET_NF_CONNTRACK_FRAG6_LOW_THRESH=30,
308 NET_NF_CONNTRACK_FRAG6_HIGH_THRESH=31,
309};
310
1da177e4
LT		 311/* /proc/sys/net/ipv4 */
312enum
313{
314 /* v2.0 compatibile variables */
315 NET_IPV4_FORWARD=8,
316 NET_IPV4_DYNADDR=9,
317
318 NET_IPV4_CONF=16,
319 NET_IPV4_NEIGH=17,
320 NET_IPV4_ROUTE=18,
321 NET_IPV4_FIB_HASH=19,
322 NET_IPV4_NETFILTER=20,
323
324 NET_IPV4_TCP_TIMESTAMPS=33,
325 NET_IPV4_TCP_WINDOW_SCALING=34,
326 NET_IPV4_TCP_SACK=35,
327 NET_IPV4_TCP_RETRANS_COLLAPSE=36,
328 NET_IPV4_DEFAULT_TTL=37,
329 NET_IPV4_AUTOCONFIG=38,
330 NET_IPV4_NO_PMTU_DISC=39,
331 NET_IPV4_TCP_SYN_RETRIES=40,
332 NET_IPV4_IPFRAG_HIGH_THRESH=41,
333 NET_IPV4_IPFRAG_LOW_THRESH=42,
334 NET_IPV4_IPFRAG_TIME=43,
335 NET_IPV4_TCP_MAX_KA_PROBES=44,
336 NET_IPV4_TCP_KEEPALIVE_TIME=45,
337 NET_IPV4_TCP_KEEPALIVE_PROBES=46,
338 NET_IPV4_TCP_RETRIES1=47,
339 NET_IPV4_TCP_RETRIES2=48,
340 NET_IPV4_TCP_FIN_TIMEOUT=49,
341 NET_IPV4_IP_MASQ_DEBUG=50,
342 NET_TCP_SYNCOOKIES=51,
343 NET_TCP_STDURG=52,
344 NET_TCP_RFC1337=53,
345 NET_TCP_SYN_TAILDROP=54,
346 NET_TCP_MAX_SYN_BACKLOG=55,
347 NET_IPV4_LOCAL_PORT_RANGE=56,
348 NET_IPV4_ICMP_ECHO_IGNORE_ALL=57,
349 NET_IPV4_ICMP_ECHO_IGNORE_BROADCASTS=58,
350 NET_IPV4_ICMP_SOURCEQUENCH_RATE=59,
351 NET_IPV4_ICMP_DESTUNREACH_RATE=60,
352 NET_IPV4_ICMP_TIMEEXCEED_RATE=61,
353 NET_IPV4_ICMP_PARAMPROB_RATE=62,
354 NET_IPV4_ICMP_ECHOREPLY_RATE=63,
355 NET_IPV4_ICMP_IGNORE_BOGUS_ERROR_RESPONSES=64,
356 NET_IPV4_IGMP_MAX_MEMBERSHIPS=65,
357 NET_TCP_TW_RECYCLE=66,
358 NET_IPV4_ALWAYS_DEFRAG=67,
359 NET_IPV4_TCP_KEEPALIVE_INTVL=68,
360 NET_IPV4_INET_PEER_THRESHOLD=69,
361 NET_IPV4_INET_PEER_MINTTL=70,
362 NET_IPV4_INET_PEER_MAXTTL=71,
363 NET_IPV4_INET_PEER_GC_MINTIME=72,
364 NET_IPV4_INET_PEER_GC_MAXTIME=73,
365 NET_TCP_ORPHAN_RETRIES=74,
366 NET_TCP_ABORT_ON_OVERFLOW=75,
367 NET_TCP_SYNACK_RETRIES=76,
368 NET_TCP_MAX_ORPHANS=77,
369 NET_TCP_MAX_TW_BUCKETS=78,
370 NET_TCP_FACK=79,
371 NET_TCP_REORDERING=80,
372 NET_TCP_ECN=81,
373 NET_TCP_DSACK=82,
374 NET_TCP_MEM=83,
375 NET_TCP_WMEM=84,
376 NET_TCP_RMEM=85,
377 NET_TCP_APP_WIN=86,
378 NET_TCP_ADV_WIN_SCALE=87,
379 NET_IPV4_NONLOCAL_BIND=88,
380 NET_IPV4_ICMP_RATELIMIT=89,
381 NET_IPV4_ICMP_RATEMASK=90,
382 NET_TCP_TW_REUSE=91,
383 NET_TCP_FRTO=92,
384 NET_TCP_LOW_LATENCY=93,
385 NET_IPV4_IPFRAG_SECRET_INTERVAL=94,
1da177e4
LT		 386 NET_IPV4_IGMP_MAX_MSF=96,
387 NET_TCP_NO_METRICS_SAVE=97,
1da177e4
LT		 388 NET_TCP_DEFAULT_WIN_SCALE=105,
389 NET_TCP_MODERATE_RCVBUF=106,
390 NET_TCP_TSO_WIN_DIVISOR=107,
391 NET_TCP_BIC_BETA=108,
1c2fb7f9 392 NET_IPV4_ICMP_ERRORS_USE_INBOUND_IFADDR=109,
317a76f9 393 NET_TCP_CONG_CONTROL=110,
9772efb9 394 NET_TCP_ABC=111,
89cee8b1 395 NET_IPV4_IPFRAG_MAX_DIST=112,
1da177e4
LT		 396};
397
398enum {
399 NET_IPV4_ROUTE_FLUSH=1,
400 NET_IPV4_ROUTE_MIN_DELAY=2,
401 NET_IPV4_ROUTE_MAX_DELAY=3,
402 NET_IPV4_ROUTE_GC_THRESH=4,
403 NET_IPV4_ROUTE_MAX_SIZE=5,
404 NET_IPV4_ROUTE_GC_MIN_INTERVAL=6,
405 NET_IPV4_ROUTE_GC_TIMEOUT=7,
406 NET_IPV4_ROUTE_GC_INTERVAL=8,
407 NET_IPV4_ROUTE_REDIRECT_LOAD=9,
408 NET_IPV4_ROUTE_REDIRECT_NUMBER=10,
409 NET_IPV4_ROUTE_REDIRECT_SILENCE=11,
410 NET_IPV4_ROUTE_ERROR_COST=12,
411 NET_IPV4_ROUTE_ERROR_BURST=13,
412 NET_IPV4_ROUTE_GC_ELASTICITY=14,
413 NET_IPV4_ROUTE_MTU_EXPIRES=15,
414 NET_IPV4_ROUTE_MIN_PMTU=16,
415 NET_IPV4_ROUTE_MIN_ADVMSS=17,
416 NET_IPV4_ROUTE_SECRET_INTERVAL=18,
417 NET_IPV4_ROUTE_GC_MIN_INTERVAL_MS=19,
418};
419
420enum
421{
422 NET_PROTO_CONF_ALL=-2,
423 NET_PROTO_CONF_DEFAULT=-3
424
425 /* And device ifindices ... */
426};
427
428enum
429{
430 NET_IPV4_CONF_FORWARDING=1,
431 NET_IPV4_CONF_MC_FORWARDING=2,
432 NET_IPV4_CONF_PROXY_ARP=3,
433 NET_IPV4_CONF_ACCEPT_REDIRECTS=4,
434 NET_IPV4_CONF_SECURE_REDIRECTS=5,
435 NET_IPV4_CONF_SEND_REDIRECTS=6,
436 NET_IPV4_CONF_SHARED_MEDIA=7,
437 NET_IPV4_CONF_RP_FILTER=8,
438 NET_IPV4_CONF_ACCEPT_SOURCE_ROUTE=9,
439 NET_IPV4_CONF_BOOTP_RELAY=10,
440 NET_IPV4_CONF_LOG_MARTIANS=11,
441 NET_IPV4_CONF_TAG=12,
442 NET_IPV4_CONF_ARPFILTER=13,
443 NET_IPV4_CONF_MEDIUM_ID=14,
444 NET_IPV4_CONF_NOXFRM=15,
445 NET_IPV4_CONF_NOPOLICY=16,
446 NET_IPV4_CONF_FORCE_IGMP_VERSION=17,
447 NET_IPV4_CONF_ARP_ANNOUNCE=18,
448 NET_IPV4_CONF_ARP_IGNORE=19,
8f937c60 449 NET_IPV4_CONF_PROMOTE_SECONDARIES=20,
1da177e4
LT		 450 __NET_IPV4_CONF_MAX
451};
452
453/* /proc/sys/net/ipv4/netfilter */
454enum
455{
456 NET_IPV4_NF_CONNTRACK_MAX=1,
457 NET_IPV4_NF_CONNTRACK_TCP_TIMEOUT_SYN_SENT=2,
458 NET_IPV4_NF_CONNTRACK_TCP_TIMEOUT_SYN_RECV=3,
459 NET_IPV4_NF_CONNTRACK_TCP_TIMEOUT_ESTABLISHED=4,
460 NET_IPV4_NF_CONNTRACK_TCP_TIMEOUT_FIN_WAIT=5,
461 NET_IPV4_NF_CONNTRACK_TCP_TIMEOUT_CLOSE_WAIT=6,
462 NET_IPV4_NF_CONNTRACK_TCP_TIMEOUT_LAST_ACK=7,
463 NET_IPV4_NF_CONNTRACK_TCP_TIMEOUT_TIME_WAIT=8,
464 NET_IPV4_NF_CONNTRACK_TCP_TIMEOUT_CLOSE=9,
465 NET_IPV4_NF_CONNTRACK_UDP_TIMEOUT=10,
466 NET_IPV4_NF_CONNTRACK_UDP_TIMEOUT_STREAM=11,
467 NET_IPV4_NF_CONNTRACK_ICMP_TIMEOUT=12,
468 NET_IPV4_NF_CONNTRACK_GENERIC_TIMEOUT=13,
469 NET_IPV4_NF_CONNTRACK_BUCKETS=14,
470 NET_IPV4_NF_CONNTRACK_LOG_INVALID=15,
471 NET_IPV4_NF_CONNTRACK_TCP_TIMEOUT_MAX_RETRANS=16,
472 NET_IPV4_NF_CONNTRACK_TCP_LOOSE=17,
473 NET_IPV4_NF_CONNTRACK_TCP_BE_LIBERAL=18,
474 NET_IPV4_NF_CONNTRACK_TCP_MAX_RETRANS=19,
475 NET_IPV4_NF_CONNTRACK_SCTP_TIMEOUT_CLOSED=20,
476 NET_IPV4_NF_CONNTRACK_SCTP_TIMEOUT_COOKIE_WAIT=21,
477 NET_IPV4_NF_CONNTRACK_SCTP_TIMEOUT_COOKIE_ECHOED=22,
478 NET_IPV4_NF_CONNTRACK_SCTP_TIMEOUT_ESTABLISHED=23,
479 NET_IPV4_NF_CONNTRACK_SCTP_TIMEOUT_SHUTDOWN_SENT=24,
480 NET_IPV4_NF_CONNTRACK_SCTP_TIMEOUT_SHUTDOWN_RECD=25,
481 NET_IPV4_NF_CONNTRACK_SCTP_TIMEOUT_SHUTDOWN_ACK_SENT=26,
482 NET_IPV4_NF_CONNTRACK_COUNT=27,
483};
484
485/* /proc/sys/net/ipv6 */
486enum {
487 NET_IPV6_CONF=16,
488 NET_IPV6_NEIGH=17,
489 NET_IPV6_ROUTE=18,
490 NET_IPV6_ICMP=19,
491 NET_IPV6_BINDV6ONLY=20,
492 NET_IPV6_IP6FRAG_HIGH_THRESH=21,
493 NET_IPV6_IP6FRAG_LOW_THRESH=22,
494 NET_IPV6_IP6FRAG_TIME=23,
495 NET_IPV6_IP6FRAG_SECRET_INTERVAL=24,
496 NET_IPV6_MLD_MAX_MSF=25,
497};
498
499enum {
500 NET_IPV6_ROUTE_FLUSH=1,
501 NET_IPV6_ROUTE_GC_THRESH=2,
502 NET_IPV6_ROUTE_MAX_SIZE=3,
503 NET_IPV6_ROUTE_GC_MIN_INTERVAL=4,
504 NET_IPV6_ROUTE_GC_TIMEOUT=5,
505 NET_IPV6_ROUTE_GC_INTERVAL=6,
506 NET_IPV6_ROUTE_GC_ELASTICITY=7,
507 NET_IPV6_ROUTE_MTU_EXPIRES=8,
508 NET_IPV6_ROUTE_MIN_ADVMSS=9,
509 NET_IPV6_ROUTE_GC_MIN_INTERVAL_MS=10
510};
511
512enum {
513 NET_IPV6_FORWARDING=1,
514 NET_IPV6_HOP_LIMIT=2,
515 NET_IPV6_MTU=3,
516 NET_IPV6_ACCEPT_RA=4,
517 NET_IPV6_ACCEPT_REDIRECTS=5,
518 NET_IPV6_AUTOCONF=6,
519 NET_IPV6_DAD_TRANSMITS=7,
520 NET_IPV6_RTR_SOLICITS=8,
521 NET_IPV6_RTR_SOLICIT_INTERVAL=9,
522 NET_IPV6_RTR_SOLICIT_DELAY=10,
523 NET_IPV6_USE_TEMPADDR=11,
524 NET_IPV6_TEMP_VALID_LFT=12,
525 NET_IPV6_TEMP_PREFERED_LFT=13,
526 NET_IPV6_REGEN_MAX_RETRY=14,
527 NET_IPV6_MAX_DESYNC_FACTOR=15,
528 NET_IPV6_MAX_ADDRESSES=16,
529 NET_IPV6_FORCE_MLD_VERSION=17,
530 __NET_IPV6_MAX
531};
532
533/* /proc/sys/net/ipv6/icmp */
534enum {
535 NET_IPV6_ICMP_RATELIMIT=1
536};
537
538/* /proc/sys/net/<protocol>/neigh/<dev> */
539enum {
540 NET_NEIGH_MCAST_SOLICIT=1,
541 NET_NEIGH_UCAST_SOLICIT=2,
542 NET_NEIGH_APP_SOLICIT=3,
543 NET_NEIGH_RETRANS_TIME=4,
544 NET_NEIGH_REACHABLE_TIME=5,
545 NET_NEIGH_DELAY_PROBE_TIME=6,
546 NET_NEIGH_GC_STALE_TIME=7,
547 NET_NEIGH_UNRES_QLEN=8,
548 NET_NEIGH_PROXY_QLEN=9,
549 NET_NEIGH_ANYCAST_DELAY=10,
550 NET_NEIGH_PROXY_DELAY=11,
551 NET_NEIGH_LOCKTIME=12,
552 NET_NEIGH_GC_INTERVAL=13,
553 NET_NEIGH_GC_THRESH1=14,
554 NET_NEIGH_GC_THRESH2=15,
555 NET_NEIGH_GC_THRESH3=16,
556 NET_NEIGH_RETRANS_TIME_MS=17,
557 NET_NEIGH_REACHABLE_TIME_MS=18,
558 __NET_NEIGH_MAX
559};
560
561/* /proc/sys/net/ipx */
562enum {
563 NET_IPX_PPROP_BROADCASTING=1,
564 NET_IPX_FORWARDING=2
565};
566
590232a7
ACM		 567/* /proc/sys/net/llc */
568enum {
569 NET_LLC2=1,
570 NET_LLC_STATION=2,
571};
572
573/* /proc/sys/net/llc/llc2 */
574enum {
575 NET_LLC2_TIMEOUT=1,
576};
577
578/* /proc/sys/net/llc/station */
579enum {
580 NET_LLC_STATION_ACK_TIMEOUT=1,
581};
582
583/* /proc/sys/net/llc/llc2/timeout */
584enum {
585 NET_LLC2_ACK_TIMEOUT=1,
586 NET_LLC2_P_TIMEOUT=2,
587 NET_LLC2_REJ_TIMEOUT=3,
588 NET_LLC2_BUSY_TIMEOUT=4,
589};
1da177e4
LT		 590
591/* /proc/sys/net/appletalk */
592enum {
593 NET_ATALK_AARP_EXPIRY_TIME=1,
594 NET_ATALK_AARP_TICK_TIME=2,
595 NET_ATALK_AARP_RETRANSMIT_LIMIT=3,
596 NET_ATALK_AARP_RESOLVE_TIME=4
597};
598
599
600/* /proc/sys/net/netrom */
601enum {
602 NET_NETROM_DEFAULT_PATH_QUALITY=1,
603 NET_NETROM_OBSOLESCENCE_COUNT_INITIALISER=2,
604 NET_NETROM_NETWORK_TTL_INITIALISER=3,
605 NET_NETROM_TRANSPORT_TIMEOUT=4,
606 NET_NETROM_TRANSPORT_MAXIMUM_TRIES=5,
607 NET_NETROM_TRANSPORT_ACKNOWLEDGE_DELAY=6,
608 NET_NETROM_TRANSPORT_BUSY_DELAY=7,
609 NET_NETROM_TRANSPORT_REQUESTED_WINDOW_SIZE=8,
610 NET_NETROM_TRANSPORT_NO_ACTIVITY_TIMEOUT=9,
611 NET_NETROM_ROUTING_CONTROL=10,
e21ce8c7
RB		 612 NET_NETROM_LINK_FAILS_COUNT=11,
613 NET_NETROM_RESET=12
1da177e4
LT		 614};
615
616/* /proc/sys/net/ax25 */
617enum {
618 NET_AX25_IP_DEFAULT_MODE=1,
619 NET_AX25_DEFAULT_MODE=2,
620 NET_AX25_BACKOFF_TYPE=3,
621 NET_AX25_CONNECT_MODE=4,
622 NET_AX25_STANDARD_WINDOW=5,
623 NET_AX25_EXTENDED_WINDOW=6,
624 NET_AX25_T1_TIMEOUT=7,
625 NET_AX25_T2_TIMEOUT=8,
626 NET_AX25_T3_TIMEOUT=9,
627 NET_AX25_IDLE_TIMEOUT=10,
628 NET_AX25_N2=11,
629 NET_AX25_PACLEN=12,
630 NET_AX25_PROTOCOL=13,
631 NET_AX25_DAMA_SLAVE_TIMEOUT=14
632};
633
634/* /proc/sys/net/rose */
635enum {
636 NET_ROSE_RESTART_REQUEST_TIMEOUT=1,
637 NET_ROSE_CALL_REQUEST_TIMEOUT=2,
638 NET_ROSE_RESET_REQUEST_TIMEOUT=3,
639 NET_ROSE_CLEAR_REQUEST_TIMEOUT=4,
640 NET_ROSE_ACK_HOLD_BACK_TIMEOUT=5,
641 NET_ROSE_ROUTING_CONTROL=6,
642 NET_ROSE_LINK_FAIL_TIMEOUT=7,
643 NET_ROSE_MAX_VCS=8,
644 NET_ROSE_WINDOW_SIZE=9,
645 NET_ROSE_NO_ACTIVITY_TIMEOUT=10
646};
647
648/* /proc/sys/net/x25 */
649enum {
650 NET_X25_RESTART_REQUEST_TIMEOUT=1,
651 NET_X25_CALL_REQUEST_TIMEOUT=2,
652 NET_X25_RESET_REQUEST_TIMEOUT=3,
653 NET_X25_CLEAR_REQUEST_TIMEOUT=4,
654 NET_X25_ACK_HOLD_BACK_TIMEOUT=5
655};
656
657/* /proc/sys/net/token-ring */
658enum
659{
660 NET_TR_RIF_TIMEOUT=1
661};
662
663/* /proc/sys/net/decnet/ */
664enum {
665 NET_DECNET_NODE_TYPE = 1,
666 NET_DECNET_NODE_ADDRESS = 2,
667 NET_DECNET_NODE_NAME = 3,
668 NET_DECNET_DEFAULT_DEVICE = 4,
669 NET_DECNET_TIME_WAIT = 5,
670 NET_DECNET_DN_COUNT = 6,
671 NET_DECNET_DI_COUNT = 7,
672 NET_DECNET_DR_COUNT = 8,
673 NET_DECNET_DST_GC_INTERVAL = 9,
674 NET_DECNET_CONF = 10,
675 NET_DECNET_NO_FC_MAX_CWND = 11,
1f12bcc9
SW		 676 NET_DECNET_MEM = 12,
677 NET_DECNET_RMEM = 13,
678 NET_DECNET_WMEM = 14,
1da177e4
LT		 679 NET_DECNET_DEBUG_LEVEL = 255
680};
681
682/* /proc/sys/net/decnet/conf/<dev> */
683enum {
684 NET_DECNET_CONF_LOOPBACK = -2,
685 NET_DECNET_CONF_DDCMP = -3,
686 NET_DECNET_CONF_PPP = -4,
687 NET_DECNET_CONF_X25 = -5,
688 NET_DECNET_CONF_GRE = -6,
689 NET_DECNET_CONF_ETHER = -7
690
691 /* ... and ifindex of devices */
692};
693
694/* /proc/sys/net/decnet/conf/<dev>/ */
695enum {
696 NET_DECNET_CONF_DEV_PRIORITY = 1,
697 NET_DECNET_CONF_DEV_T1 = 2,
698 NET_DECNET_CONF_DEV_T2 = 3,
699 NET_DECNET_CONF_DEV_T3 = 4,
700 NET_DECNET_CONF_DEV_FORWARDING = 5,
701 NET_DECNET_CONF_DEV_BLKSIZE = 6,
702 NET_DECNET_CONF_DEV_STATE = 7
703};
704
705/* /proc/sys/net/sctp */
706enum {
707 NET_SCTP_RTO_INITIAL = 1,
708 NET_SCTP_RTO_MIN = 2,
709 NET_SCTP_RTO_MAX = 3,
710 NET_SCTP_RTO_ALPHA = 4,
711 NET_SCTP_RTO_BETA = 5,
712 NET_SCTP_VALID_COOKIE_LIFE = 6,
713 NET_SCTP_ASSOCIATION_MAX_RETRANS = 7,
714 NET_SCTP_PATH_MAX_RETRANS = 8,
715 NET_SCTP_MAX_INIT_RETRANSMITS = 9,
716 NET_SCTP_HB_INTERVAL = 10,
717 NET_SCTP_PRESERVE_ENABLE = 11,
718 NET_SCTP_MAX_BURST = 12,
719 NET_SCTP_ADDIP_ENABLE = 13,
720 NET_SCTP_PRSCTP_ENABLE = 14,
4eb701df 721 NET_SCTP_SNDBUF_POLICY = 15,
2f85a429 722 NET_SCTP_SACK_TIMEOUT = 16,
049b3ff5 723 NET_SCTP_RCVBUF_POLICY = 17,
1da177e4
LT		 724};
725
726/* /proc/sys/net/bridge */
727enum {
728 NET_BRIDGE_NF_CALL_ARPTABLES = 1,
729 NET_BRIDGE_NF_CALL_IPTABLES = 2,
730 NET_BRIDGE_NF_CALL_IP6TABLES = 3,
731 NET_BRIDGE_NF_FILTER_VLAN_TAGGED = 4,
732};
733
734/* CTL_PROC names: */
735
736/* CTL_FS names: */
737enum
738{
739 FS_NRINODE=1, /* int:current number of allocated inodes */
740 FS_STATINODE=2,
741 FS_MAXINODE=3, /* int:maximum number of inodes that can be allocated */
742 FS_NRDQUOT=4, /* int:current number of allocated dquots */
743 FS_MAXDQUOT=5, /* int:maximum number of dquots that can be allocated */
744 FS_NRFILE=6, /* int:current number of allocated filedescriptors */
745 FS_MAXFILE=7, /* int:maximum number of filedescriptors that can be allocated */
746 FS_DENTRY=8,
747 FS_NRSUPER=9, /* int:current number of allocated super_blocks */
748 FS_MAXSUPER=10, /* int:maximum number of super_blocks that can be allocated */
749 FS_OVERFLOWUID=11, /* int: overflow UID */
750 FS_OVERFLOWGID=12, /* int: overflow GID */
751 FS_LEASES=13, /* int: leases enabled */
752 FS_DIR_NOTIFY=14, /* int: directory notification enabled */
753 FS_LEASE_TIME=15, /* int: maximum time to wait for a lease break */
754 FS_DQSTATS=16, /* disc quota usage statistics and control */
755 FS_XFS=17, /* struct: control xfs parameters */
756 FS_AIO_NR=18, /* current system-wide number of aio requests */
757 FS_AIO_MAX_NR=19, /* system-wide maximum number of aio requests */
0399cb08 758 FS_INOTIFY=20, /* inotify submenu */
1da177e4
LT		 759};
760
761/* /proc/sys/fs/quota/ */
762enum {
763 FS_DQ_LOOKUPS = 1,
764 FS_DQ_DROPS = 2,
765 FS_DQ_READS = 3,
766 FS_DQ_WRITES = 4,
767 FS_DQ_CACHE_HITS = 5,
768 FS_DQ_ALLOCATED = 6,
769 FS_DQ_FREE = 7,
770 FS_DQ_SYNCS = 8,
771 FS_DQ_WARNINGS = 9,
772};
773
774/* CTL_DEBUG names: */
775
776/* CTL_DEV names: */
777enum {
778 DEV_CDROM=1,
779 DEV_HWMON=2,
780 DEV_PARPORT=3,
781 DEV_RAID=4,
782 DEV_MAC_HID=5,
783 DEV_SCSI=6,
8c702e16 784 DEV_IPMI=7,
1da177e4
LT		 785};
786
787/* /proc/sys/dev/cdrom */
788enum {
789 DEV_CDROM_INFO=1,
790 DEV_CDROM_AUTOCLOSE=2,
791 DEV_CDROM_AUTOEJECT=3,
792 DEV_CDROM_DEBUG=4,
793 DEV_CDROM_LOCK=5,
794 DEV_CDROM_CHECK_MEDIA=6
795};
796
797/* /proc/sys/dev/parport */
798enum {
799 DEV_PARPORT_DEFAULT=-3
800};
801
802/* /proc/sys/dev/raid */
803enum {
804 DEV_RAID_SPEED_LIMIT_MIN=1,
805 DEV_RAID_SPEED_LIMIT_MAX=2
806};
807
808/* /proc/sys/dev/parport/default */
809enum {
810 DEV_PARPORT_DEFAULT_TIMESLICE=1,
811 DEV_PARPORT_DEFAULT_SPINTIME=2
812};
813
814/* /proc/sys/dev/parport/parport n */
815enum {
816 DEV_PARPORT_SPINTIME=1,
817 DEV_PARPORT_BASE_ADDR=2,
818 DEV_PARPORT_IRQ=3,
819 DEV_PARPORT_DMA=4,
820 DEV_PARPORT_MODES=5,
821 DEV_PARPORT_DEVICES=6,
822 DEV_PARPORT_AUTOPROBE=16
823};
824
825/* /proc/sys/dev/parport/parport n/devices/ */
826enum {
827 DEV_PARPORT_DEVICES_ACTIVE=-3,
828};
829
830/* /proc/sys/dev/parport/parport n/devices/device n */
831enum {
832 DEV_PARPORT_DEVICE_TIMESLICE=1,
833};
834
835/* /proc/sys/dev/mac_hid */
836enum {
837 DEV_MAC_HID_KEYBOARD_SENDS_LINUX_KEYCODES=1,
838 DEV_MAC_HID_KEYBOARD_LOCK_KEYCODES=2,
839 DEV_MAC_HID_MOUSE_BUTTON_EMULATION=3,
840 DEV_MAC_HID_MOUSE_BUTTON2_KEYCODE=4,
841 DEV_MAC_HID_MOUSE_BUTTON3_KEYCODE=5,
842 DEV_MAC_HID_ADB_MOUSE_SENDS_KEYCODES=6
843};
844
845/* /proc/sys/dev/scsi */
846enum {
847 DEV_SCSI_LOGGING_LEVEL=1,
848};
849
8c702e16
CM		 850/* /proc/sys/dev/ipmi */
851enum {
852 DEV_IPMI_POWEROFF_POWERCYCLE=1,
853};
854
1da177e4
LT		 855/* /proc/sys/abi */
856enum
857{
858 ABI_DEFHANDLER_COFF=1, /* default handler for coff binaries */
859 ABI_DEFHANDLER_ELF=2, /* default handler for ELF binaries */
860 ABI_DEFHANDLER_LCALL7=3,/* default handler for procs using lcall7 */
861 ABI_DEFHANDLER_LIBCSO=4,/* default handler for an libc.so ELF interp */
862 ABI_TRACE=5, /* tracing flags */
863 ABI_FAKE_UTSNAME=6, /* fake target utsname information */
864};
865
866#ifdef __KERNEL__
d4ed803c 867#include <linux/list.h>
1da177e4
LT		 868
869extern void sysctl_init(void);
870
871typedef struct ctl_table ctl_table;
872
873typedef int ctl_handler (ctl_table *table, int __user *name, int nlen,
874 void __user *oldval, size_t __user *oldlenp,
875 void __user *newval, size_t newlen,
876 void **context);
877
878typedef int proc_handler (ctl_table *ctl, int write, struct file * filp,
879 void __user *buffer, size_t *lenp, loff_t *ppos);
880
881extern int proc_dostring(ctl_table *, int, struct file *,
882 void __user *, size_t *, loff_t *);
883extern int proc_dointvec(ctl_table *, int, struct file *,
884 void __user *, size_t *, loff_t *);
885extern int proc_dointvec_bset(ctl_table *, int, struct file *,
886 void __user *, size_t *, loff_t *);
887extern int proc_dointvec_minmax(ctl_table *, int, struct file *,
888 void __user *, size_t *, loff_t *);
889extern int proc_dointvec_jiffies(ctl_table *, int, struct file *,
890 void __user *, size_t *, loff_t *);
891extern int proc_dointvec_userhz_jiffies(ctl_table *, int, struct file *,
892 void __user *, size_t *, loff_t *);
893extern int proc_dointvec_ms_jiffies(ctl_table *, int, struct file *,
894 void __user *, size_t *, loff_t *);
895extern int proc_doulongvec_minmax(ctl_table *, int, struct file *,
896 void __user *, size_t *, loff_t *);
897extern int proc_doulongvec_ms_jiffies_minmax(ctl_table *table, int,
898 struct file *, void __user *, size_t *, loff_t *);
899
900extern int do_sysctl (int __user *name, int nlen,
901 void __user *oldval, size_t __user *oldlenp,
902 void __user *newval, size_t newlen);
903
904extern int do_sysctl_strategy (ctl_table *table,
905 int __user *name, int nlen,
906 void __user *oldval, size_t __user *oldlenp,
907 void __user *newval, size_t newlen, void ** context);
908
909extern ctl_handler sysctl_string;
910extern ctl_handler sysctl_intvec;
911extern ctl_handler sysctl_jiffies;
912extern ctl_handler sysctl_ms_jiffies;
913
914
915/*
916 * Register a set of sysctl names by calling register_sysctl_table
917 * with an initialised array of ctl_table's. An entry with zero
918 * ctl_name terminates the table. table->de will be set up by the
919 * registration and need not be initialised in advance.
920 *
921 * sysctl names can be mirrored automatically under /proc/sys. The
922 * procname supplied controls /proc naming.
923 *
924 * The table's mode will be honoured both for sys_sysctl(2) and
925 * proc-fs access.
926 *
927 * Leaf nodes in the sysctl tree will be represented by a single file
928 * under /proc; non-leaf nodes will be represented by directories. A
929 * null procname disables /proc mirroring at this node.
930 *
931 * sysctl(2) can automatically manage read and write requests through
932 * the sysctl table. The data and maxlen fields of the ctl_table
933 * struct enable minimal validation of the values being written to be
934 * performed, and the mode field allows minimal authentication.
935 *
936 * More sophisticated management can be enabled by the provision of a
937 * strategy routine with the table entry. This will be called before
938 * any automatic read or write of the data is performed.
939 *
940 * The strategy routine may return:
941 * <0: Error occurred (error is passed to user process)
942 * 0: OK - proceed with automatic read or write.
943 * >0: OK - read or write has been done by the strategy routine, so
944 * return immediately.
945 *
946 * There must be a proc_handler routine for any terminal nodes
947 * mirrored under /proc/sys (non-terminals are handled by a built-in
948 * directory handler). Several default handlers are available to
949 * cover common cases.
950 */
951
952/* A sysctl table is an array of struct ctl_table: */
953struct ctl_table
954{
955 int ctl_name; /* Binary ID */
956 const char *procname; /* Text ID for /proc/sys, or zero */
957 void *data;
958 int maxlen;
959 mode_t mode;
960 ctl_table *child;
961 proc_handler *proc_handler; /* Callback for text formatting */
962 ctl_handler *strategy; /* Callback function for all r/w */
963 struct proc_dir_entry *de; /* /proc control block */
964 void *extra1;
965 void *extra2;
966};
967
968/* struct ctl_table_header is used to maintain dynamic lists of
969 ctl_table trees. */
970struct ctl_table_header
971{
972 ctl_table *ctl_table;
973 struct list_head ctl_entry;
330d57fb
AV		 974 int used;
975 struct completion *unregistering;
1da177e4
LT		 976};
977
978struct ctl_table_header * register_sysctl_table(ctl_table * table,
979 int insert_at_head);
980void unregister_sysctl_table(struct ctl_table_header * table);
981
982#else /* __KERNEL__ */
983
984#endif /* __KERNEL__ */
985
986#endif /* _LINUX_SYSCTL_H */
Linux 6.x block layer and io_uring tree(s)