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[TCP]: Restrict congestion control choices.
[linux-2.6/kvm.git] / include / linux / sysctl.h
blob0725441621d090fcdb1ca9e67c80647956740a26
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 to
14 ** have 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 ** For new interfaces unless you really need a binary number
19 ** please use CTL_UNNUMBERED.
20 **
21 ****************************************************************
22 ****************************************************************
23 */
24
25 #ifndef _LINUX_SYSCTL_H
26 #define _LINUX_SYSCTL_H
27
28 #include <linux/kernel.h>
29 #include <linux/types.h>
30 #include <linux/compiler.h>
31
32 struct file;
33 struct completion;
34
35 #define CTL_MAXNAME 10 /* how many path components do we allow in a
36 call to sysctl? In other words, what is
37 the largest acceptable value for the nlen
38 member of a struct __sysctl_args to have? */
39
40 struct __sysctl_args {
41 int __user *name;
42 int nlen;
43 void __user *oldval;
44 size_t __user *oldlenp;
45 void __user *newval;
46 size_t newlen;
47 unsigned long __unused[4];
48 };
49
50 /* Define sysctl names first */
51
52 /* Top-level names: */
53
54 /* For internal pattern-matching use only: */
55 #ifdef __KERNEL__
56 #define CTL_ANY -1 /* Matches any name */
57 #define CTL_NONE 0
58 #define CTL_UNNUMBERED CTL_NONE /* sysctl without a binary number */
59 #endif
60
61 enum
62 {
63 CTL_KERN=1, /* General kernel info and control */
64 CTL_VM=2, /* VM management */
65 CTL_NET=3, /* Networking */
66 /* was CTL_PROC */
67 CTL_FS=5, /* Filesystems */
68 CTL_DEBUG=6, /* Debugging */
69 CTL_DEV=7, /* Devices */
70 CTL_BUS=8, /* Busses */
71 CTL_ABI=9, /* Binary emulation */
72 CTL_CPU=10 /* CPU stuff (speed scaling, etc) */
73 };
74
75 /* CTL_BUS names: */
76 enum
77 {
78 CTL_BUS_ISA=1 /* ISA */
79 };
80
81 /* /proc/sys/fs/inotify/ */
82 enum
83 {
84 INOTIFY_MAX_USER_INSTANCES=1, /* max instances per user */
85 INOTIFY_MAX_USER_WATCHES=2, /* max watches per user */
86 INOTIFY_MAX_QUEUED_EVENTS=3 /* max queued events per instance */
87 };
88
89 /* CTL_KERN names: */
90 enum
91 {
92 KERN_OSTYPE=1, /* string: system version */
93 KERN_OSRELEASE=2, /* string: system release */
94 KERN_OSREV=3, /* int: system revision */
95 KERN_VERSION=4, /* string: compile time info */
96 KERN_SECUREMASK=5, /* struct: maximum rights mask */
97 KERN_PROF=6, /* table: profiling information */
98 KERN_NODENAME=7,
99 KERN_DOMAINNAME=8,
100
101 KERN_CAP_BSET=14, /* int: capability bounding set */
102 KERN_PANIC=15, /* int: panic timeout */
103 KERN_REALROOTDEV=16, /* real root device to mount after initrd */
104
105 KERN_SPARC_REBOOT=21, /* reboot command on Sparc */
106 KERN_CTLALTDEL=22, /* int: allow ctl-alt-del to reboot */
107 KERN_PRINTK=23, /* struct: control printk logging parameters */
108 KERN_NAMETRANS=24, /* Name translation */
109 KERN_PPC_HTABRECLAIM=25, /* turn htab reclaimation on/off on PPC */
110 KERN_PPC_ZEROPAGED=26, /* turn idle page zeroing on/off on PPC */
111 KERN_PPC_POWERSAVE_NAP=27, /* use nap mode for power saving */
112 KERN_MODPROBE=28,
113 KERN_SG_BIG_BUFF=29,
114 KERN_ACCT=30, /* BSD process accounting parameters */
115 KERN_PPC_L2CR=31, /* l2cr register on PPC */
116
117 KERN_RTSIGNR=32, /* Number of rt sigs queued */
118 KERN_RTSIGMAX=33, /* Max queuable */
119
120 KERN_SHMMAX=34, /* long: Maximum shared memory segment */
121 KERN_MSGMAX=35, /* int: Maximum size of a messege */
122 KERN_MSGMNB=36, /* int: Maximum message queue size */
123 KERN_MSGPOOL=37, /* int: Maximum system message pool size */
124 KERN_SYSRQ=38, /* int: Sysreq enable */
125 KERN_MAX_THREADS=39, /* int: Maximum nr of threads in the system */
126 KERN_RANDOM=40, /* Random driver */
127 KERN_SHMALL=41, /* int: Maximum size of shared memory */
128 KERN_MSGMNI=42, /* int: msg queue identifiers */
129 KERN_SEM=43, /* struct: sysv semaphore limits */
130 KERN_SPARC_STOP_A=44, /* int: Sparc Stop-A enable */
131 KERN_SHMMNI=45, /* int: shm array identifiers */
132 KERN_OVERFLOWUID=46, /* int: overflow UID */
133 KERN_OVERFLOWGID=47, /* int: overflow GID */
134 KERN_SHMPATH=48, /* string: path to shm fs */
135 KERN_HOTPLUG=49, /* string: path to uevent helper (deprecated) */
136 KERN_IEEE_EMULATION_WARNINGS=50, /* int: unimplemented ieee instructions */
137 KERN_S390_USER_DEBUG_LOGGING=51, /* int: dumps of user faults */
138 KERN_CORE_USES_PID=52, /* int: use core or core.%pid */
139 KERN_TAINTED=53, /* int: various kernel tainted flags */
140 KERN_CADPID=54, /* int: PID of the process to notify on CAD */
141 KERN_PIDMAX=55, /* int: PID # limit */
142 KERN_CORE_PATTERN=56, /* string: pattern for core-file names */
143 KERN_PANIC_ON_OOPS=57, /* int: whether we will panic on an oops */
144 KERN_HPPA_PWRSW=58, /* int: hppa soft-power enable */
145 KERN_HPPA_UNALIGNED=59, /* int: hppa unaligned-trap enable */
146 KERN_PRINTK_RATELIMIT=60, /* int: tune printk ratelimiting */
147 KERN_PRINTK_RATELIMIT_BURST=61, /* int: tune printk ratelimiting */
148 KERN_PTY=62, /* dir: pty driver */
149 KERN_NGROUPS_MAX=63, /* int: NGROUPS_MAX */
150 KERN_SPARC_SCONS_PWROFF=64, /* int: serial console power-off halt */
151 KERN_HZ_TIMER=65, /* int: hz timer on or off */
152 KERN_UNKNOWN_NMI_PANIC=66, /* int: unknown nmi panic flag */
153 KERN_BOOTLOADER_TYPE=67, /* int: boot loader type */
154 KERN_RANDOMIZE=68, /* int: randomize virtual address space */
155 KERN_SETUID_DUMPABLE=69, /* int: behaviour of dumps for setuid core */
156 KERN_SPIN_RETRY=70, /* int: number of spinlock retries */
157 KERN_ACPI_VIDEO_FLAGS=71, /* int: flags for setting up video after ACPI sleep */
158 KERN_IA64_UNALIGNED=72, /* int: ia64 unaligned userland trap enable */
159 KERN_COMPAT_LOG=73, /* int: print compat layer messages */
160 KERN_MAX_LOCK_DEPTH=74,
161 KERN_NMI_WATCHDOG=75, /* int: enable/disable nmi watchdog */
162 KERN_PANIC_ON_NMI=76, /* int: whether we will panic on an unrecovered */
163 };
164
165
166
167 /* CTL_VM names: */
168 enum
169 {
170 VM_UNUSED1=1, /* was: struct: Set vm swapping control */
171 VM_UNUSED2=2, /* was; int: Linear or sqrt() swapout for hogs */
172 VM_UNUSED3=3, /* was: struct: Set free page thresholds */
173 VM_UNUSED4=4, /* Spare */
174 VM_OVERCOMMIT_MEMORY=5, /* Turn off the virtual memory safety limit */
175 VM_UNUSED5=6, /* was: struct: Set buffer memory thresholds */
176 VM_UNUSED7=7, /* was: struct: Set cache memory thresholds */
177 VM_UNUSED8=8, /* was: struct: Control kswapd behaviour */
178 VM_UNUSED9=9, /* was: struct: Set page table cache parameters */
179 VM_PAGE_CLUSTER=10, /* int: set number of pages to swap together */
180 VM_DIRTY_BACKGROUND=11, /* dirty_background_ratio */
181 VM_DIRTY_RATIO=12, /* dirty_ratio */
182 VM_DIRTY_WB_CS=13, /* dirty_writeback_centisecs */
183 VM_DIRTY_EXPIRE_CS=14, /* dirty_expire_centisecs */
184 VM_NR_PDFLUSH_THREADS=15, /* nr_pdflush_threads */
185 VM_OVERCOMMIT_RATIO=16, /* percent of RAM to allow overcommit in */
186 VM_PAGEBUF=17, /* struct: Control pagebuf parameters */
187 VM_HUGETLB_PAGES=18, /* int: Number of available Huge Pages */
188 VM_SWAPPINESS=19, /* Tendency to steal mapped memory */
189 VM_LOWMEM_RESERVE_RATIO=20,/* reservation ratio for lower memory zones */
190 VM_MIN_FREE_KBYTES=21, /* Minimum free kilobytes to maintain */
191 VM_MAX_MAP_COUNT=22, /* int: Maximum number of mmaps/address-space */
192 VM_LAPTOP_MODE=23, /* vm laptop mode */
193 VM_BLOCK_DUMP=24, /* block dump mode */
194 VM_HUGETLB_GROUP=25, /* permitted hugetlb group */
195 VM_VFS_CACHE_PRESSURE=26, /* dcache/icache reclaim pressure */
196 VM_LEGACY_VA_LAYOUT=27, /* legacy/compatibility virtual address space layout */
197 VM_SWAP_TOKEN_TIMEOUT=28, /* default time for token time out */
198 VM_DROP_PAGECACHE=29, /* int: nuke lots of pagecache */
199 VM_PERCPU_PAGELIST_FRACTION=30,/* int: fraction of pages in each percpu_pagelist */
200 VM_ZONE_RECLAIM_MODE=31, /* reclaim local zone memory before going off node */
201 VM_MIN_UNMAPPED=32, /* Set min percent of unmapped pages */
202 VM_PANIC_ON_OOM=33, /* panic at out-of-memory */
203 VM_VDSO_ENABLED=34, /* map VDSO into new processes? */
204 VM_MIN_SLAB=35, /* Percent pages ignored by zone reclaim */
205 };
206
207
208 /* CTL_NET names: */
209 enum
210 {
211 NET_CORE=1,
212 NET_ETHER=2,
213 NET_802=3,
214 NET_UNIX=4,
215 NET_IPV4=5,
216 NET_IPX=6,
217 NET_ATALK=7,
218 NET_NETROM=8,
219 NET_AX25=9,
220 NET_BRIDGE=10,
221 NET_ROSE=11,
222 NET_IPV6=12,
223 NET_X25=13,
224 NET_TR=14,
225 NET_DECNET=15,
226 NET_ECONET=16,
227 NET_SCTP=17,
228 NET_LLC=18,
229 NET_NETFILTER=19,
230 NET_DCCP=20,
231 };
232
233 /* /proc/sys/kernel/random */
234 enum
235 {
236 RANDOM_POOLSIZE=1,
237 RANDOM_ENTROPY_COUNT=2,
238 RANDOM_READ_THRESH=3,
239 RANDOM_WRITE_THRESH=4,
240 RANDOM_BOOT_ID=5,
241 RANDOM_UUID=6
242 };
243
244 /* /proc/sys/kernel/pty */
245 enum
246 {
247 PTY_MAX=1,
248 PTY_NR=2
249 };
250
251 /* /proc/sys/bus/isa */
252 enum
253 {
254 BUS_ISA_MEM_BASE=1,
255 BUS_ISA_PORT_BASE=2,
256 BUS_ISA_PORT_SHIFT=3
257 };
258
259 /* /proc/sys/net/core */
260 enum
261 {
262 NET_CORE_WMEM_MAX=1,
263 NET_CORE_RMEM_MAX=2,
264 NET_CORE_WMEM_DEFAULT=3,
265 NET_CORE_RMEM_DEFAULT=4,
266 /* was NET_CORE_DESTROY_DELAY */
267 NET_CORE_MAX_BACKLOG=6,
268 NET_CORE_FASTROUTE=7,
269 NET_CORE_MSG_COST=8,
270 NET_CORE_MSG_BURST=9,
271 NET_CORE_OPTMEM_MAX=10,
272 NET_CORE_HOT_LIST_LENGTH=11,
273 NET_CORE_DIVERT_VERSION=12,
274 NET_CORE_NO_CONG_THRESH=13,
275 NET_CORE_NO_CONG=14,
276 NET_CORE_LO_CONG=15,
277 NET_CORE_MOD_CONG=16,
278 NET_CORE_DEV_WEIGHT=17,
279 NET_CORE_SOMAXCONN=18,
280 NET_CORE_BUDGET=19,
281 NET_CORE_AEVENT_ETIME=20,
282 NET_CORE_AEVENT_RSEQTH=21,
283 };
284
285 /* /proc/sys/net/ethernet */
286
287 /* /proc/sys/net/802 */
288
289 /* /proc/sys/net/unix */
290
291 enum
292 {
293 NET_UNIX_DESTROY_DELAY=1,
294 NET_UNIX_DELETE_DELAY=2,
295 NET_UNIX_MAX_DGRAM_QLEN=3,
296 };
297
298 /* /proc/sys/net/netfilter */
299 enum
300 {
301 NET_NF_CONNTRACK_MAX=1,
302 NET_NF_CONNTRACK_TCP_TIMEOUT_SYN_SENT=2,
303 NET_NF_CONNTRACK_TCP_TIMEOUT_SYN_RECV=3,
304 NET_NF_CONNTRACK_TCP_TIMEOUT_ESTABLISHED=4,
305 NET_NF_CONNTRACK_TCP_TIMEOUT_FIN_WAIT=5,
306 NET_NF_CONNTRACK_TCP_TIMEOUT_CLOSE_WAIT=6,
307 NET_NF_CONNTRACK_TCP_TIMEOUT_LAST_ACK=7,
308 NET_NF_CONNTRACK_TCP_TIMEOUT_TIME_WAIT=8,
309 NET_NF_CONNTRACK_TCP_TIMEOUT_CLOSE=9,
310 NET_NF_CONNTRACK_UDP_TIMEOUT=10,
311 NET_NF_CONNTRACK_UDP_TIMEOUT_STREAM=11,
312 NET_NF_CONNTRACK_ICMP_TIMEOUT=12,
313 NET_NF_CONNTRACK_GENERIC_TIMEOUT=13,
314 NET_NF_CONNTRACK_BUCKETS=14,
315 NET_NF_CONNTRACK_LOG_INVALID=15,
316 NET_NF_CONNTRACK_TCP_TIMEOUT_MAX_RETRANS=16,
317 NET_NF_CONNTRACK_TCP_LOOSE=17,
318 NET_NF_CONNTRACK_TCP_BE_LIBERAL=18,
319 NET_NF_CONNTRACK_TCP_MAX_RETRANS=19,
320 NET_NF_CONNTRACK_SCTP_TIMEOUT_CLOSED=20,
321 NET_NF_CONNTRACK_SCTP_TIMEOUT_COOKIE_WAIT=21,
322 NET_NF_CONNTRACK_SCTP_TIMEOUT_COOKIE_ECHOED=22,
323 NET_NF_CONNTRACK_SCTP_TIMEOUT_ESTABLISHED=23,
324 NET_NF_CONNTRACK_SCTP_TIMEOUT_SHUTDOWN_SENT=24,
325 NET_NF_CONNTRACK_SCTP_TIMEOUT_SHUTDOWN_RECD=25,
326 NET_NF_CONNTRACK_SCTP_TIMEOUT_SHUTDOWN_ACK_SENT=26,
327 NET_NF_CONNTRACK_COUNT=27,
328 NET_NF_CONNTRACK_ICMPV6_TIMEOUT=28,
329 NET_NF_CONNTRACK_FRAG6_TIMEOUT=29,
330 NET_NF_CONNTRACK_FRAG6_LOW_THRESH=30,
331 NET_NF_CONNTRACK_FRAG6_HIGH_THRESH=31,
332 NET_NF_CONNTRACK_CHECKSUM=32,
333 };
334
335 /* /proc/sys/net/ipv4 */
336 enum
337 {
338 /* v2.0 compatibile variables */
339 NET_IPV4_FORWARD=8,
340 NET_IPV4_DYNADDR=9,
341
342 NET_IPV4_CONF=16,
343 NET_IPV4_NEIGH=17,
344 NET_IPV4_ROUTE=18,
345 NET_IPV4_FIB_HASH=19,
346 NET_IPV4_NETFILTER=20,
347
348 NET_IPV4_TCP_TIMESTAMPS=33,
349 NET_IPV4_TCP_WINDOW_SCALING=34,
350 NET_IPV4_TCP_SACK=35,
351 NET_IPV4_TCP_RETRANS_COLLAPSE=36,
352 NET_IPV4_DEFAULT_TTL=37,
353 NET_IPV4_AUTOCONFIG=38,
354 NET_IPV4_NO_PMTU_DISC=39,
355 NET_IPV4_TCP_SYN_RETRIES=40,
356 NET_IPV4_IPFRAG_HIGH_THRESH=41,
357 NET_IPV4_IPFRAG_LOW_THRESH=42,
358 NET_IPV4_IPFRAG_TIME=43,
359 NET_IPV4_TCP_MAX_KA_PROBES=44,
360 NET_IPV4_TCP_KEEPALIVE_TIME=45,
361 NET_IPV4_TCP_KEEPALIVE_PROBES=46,
362 NET_IPV4_TCP_RETRIES1=47,
363 NET_IPV4_TCP_RETRIES2=48,
364 NET_IPV4_TCP_FIN_TIMEOUT=49,
365 NET_IPV4_IP_MASQ_DEBUG=50,
366 NET_TCP_SYNCOOKIES=51,
367 NET_TCP_STDURG=52,
368 NET_TCP_RFC1337=53,
369 NET_TCP_SYN_TAILDROP=54,
370 NET_TCP_MAX_SYN_BACKLOG=55,
371 NET_IPV4_LOCAL_PORT_RANGE=56,
372 NET_IPV4_ICMP_ECHO_IGNORE_ALL=57,
373 NET_IPV4_ICMP_ECHO_IGNORE_BROADCASTS=58,
374 NET_IPV4_ICMP_SOURCEQUENCH_RATE=59,
375 NET_IPV4_ICMP_DESTUNREACH_RATE=60,
376 NET_IPV4_ICMP_TIMEEXCEED_RATE=61,
377 NET_IPV4_ICMP_PARAMPROB_RATE=62,
378 NET_IPV4_ICMP_ECHOREPLY_RATE=63,
379 NET_IPV4_ICMP_IGNORE_BOGUS_ERROR_RESPONSES=64,
380 NET_IPV4_IGMP_MAX_MEMBERSHIPS=65,
381 NET_TCP_TW_RECYCLE=66,
382 NET_IPV4_ALWAYS_DEFRAG=67,
383 NET_IPV4_TCP_KEEPALIVE_INTVL=68,
384 NET_IPV4_INET_PEER_THRESHOLD=69,
385 NET_IPV4_INET_PEER_MINTTL=70,
386 NET_IPV4_INET_PEER_MAXTTL=71,
387 NET_IPV4_INET_PEER_GC_MINTIME=72,
388 NET_IPV4_INET_PEER_GC_MAXTIME=73,
389 NET_TCP_ORPHAN_RETRIES=74,
390 NET_TCP_ABORT_ON_OVERFLOW=75,
391 NET_TCP_SYNACK_RETRIES=76,
392 NET_TCP_MAX_ORPHANS=77,
393 NET_TCP_MAX_TW_BUCKETS=78,
394 NET_TCP_FACK=79,
395 NET_TCP_REORDERING=80,
396 NET_TCP_ECN=81,
397 NET_TCP_DSACK=82,
398 NET_TCP_MEM=83,
399 NET_TCP_WMEM=84,
400 NET_TCP_RMEM=85,
401 NET_TCP_APP_WIN=86,
402 NET_TCP_ADV_WIN_SCALE=87,
403 NET_IPV4_NONLOCAL_BIND=88,
404 NET_IPV4_ICMP_RATELIMIT=89,
405 NET_IPV4_ICMP_RATEMASK=90,
406 NET_TCP_TW_REUSE=91,
407 NET_TCP_FRTO=92,
408 NET_TCP_LOW_LATENCY=93,
409 NET_IPV4_IPFRAG_SECRET_INTERVAL=94,
410 NET_IPV4_IGMP_MAX_MSF=96,
411 NET_TCP_NO_METRICS_SAVE=97,
412 NET_TCP_DEFAULT_WIN_SCALE=105,
413 NET_TCP_MODERATE_RCVBUF=106,
414 NET_TCP_TSO_WIN_DIVISOR=107,
415 NET_TCP_BIC_BETA=108,
416 NET_IPV4_ICMP_ERRORS_USE_INBOUND_IFADDR=109,
417 NET_TCP_CONG_CONTROL=110,
418 NET_TCP_ABC=111,
419 NET_IPV4_IPFRAG_MAX_DIST=112,
420 NET_TCP_MTU_PROBING=113,
421 NET_TCP_BASE_MSS=114,
422 NET_IPV4_TCP_WORKAROUND_SIGNED_WINDOWS=115,
423 NET_TCP_DMA_COPYBREAK=116,
424 NET_TCP_SLOW_START_AFTER_IDLE=117,
425 NET_CIPSOV4_CACHE_ENABLE=118,
426 NET_CIPSOV4_CACHE_BUCKET_SIZE=119,
427 NET_CIPSOV4_RBM_OPTFMT=120,
428 NET_CIPSOV4_RBM_STRICTVALID=121,
429 NET_TCP_AVAIL_CONG_CONTROL=122,
430 NET_TCP_ALLOWED_CONG_CONTROL=123,
431 };
432
433 enum {
434 NET_IPV4_ROUTE_FLUSH=1,
435 NET_IPV4_ROUTE_MIN_DELAY=2,
436 NET_IPV4_ROUTE_MAX_DELAY=3,
437 NET_IPV4_ROUTE_GC_THRESH=4,
438 NET_IPV4_ROUTE_MAX_SIZE=5,
439 NET_IPV4_ROUTE_GC_MIN_INTERVAL=6,
440 NET_IPV4_ROUTE_GC_TIMEOUT=7,
441 NET_IPV4_ROUTE_GC_INTERVAL=8,
442 NET_IPV4_ROUTE_REDIRECT_LOAD=9,
443 NET_IPV4_ROUTE_REDIRECT_NUMBER=10,
444 NET_IPV4_ROUTE_REDIRECT_SILENCE=11,
445 NET_IPV4_ROUTE_ERROR_COST=12,
446 NET_IPV4_ROUTE_ERROR_BURST=13,
447 NET_IPV4_ROUTE_GC_ELASTICITY=14,
448 NET_IPV4_ROUTE_MTU_EXPIRES=15,
449 NET_IPV4_ROUTE_MIN_PMTU=16,
450 NET_IPV4_ROUTE_MIN_ADVMSS=17,
451 NET_IPV4_ROUTE_SECRET_INTERVAL=18,
452 NET_IPV4_ROUTE_GC_MIN_INTERVAL_MS=19,
453 };
454
455 enum
456 {
457 NET_PROTO_CONF_ALL=-2,
458 NET_PROTO_CONF_DEFAULT=-3
459
460 /* And device ifindices ... */
461 };
462
463 enum
464 {
465 NET_IPV4_CONF_FORWARDING=1,
466 NET_IPV4_CONF_MC_FORWARDING=2,
467 NET_IPV4_CONF_PROXY_ARP=3,
468 NET_IPV4_CONF_ACCEPT_REDIRECTS=4,
469 NET_IPV4_CONF_SECURE_REDIRECTS=5,
470 NET_IPV4_CONF_SEND_REDIRECTS=6,
471 NET_IPV4_CONF_SHARED_MEDIA=7,
472 NET_IPV4_CONF_RP_FILTER=8,
473 NET_IPV4_CONF_ACCEPT_SOURCE_ROUTE=9,
474 NET_IPV4_CONF_BOOTP_RELAY=10,
475 NET_IPV4_CONF_LOG_MARTIANS=11,
476 NET_IPV4_CONF_TAG=12,
477 NET_IPV4_CONF_ARPFILTER=13,
478 NET_IPV4_CONF_MEDIUM_ID=14,
479 NET_IPV4_CONF_NOXFRM=15,
480 NET_IPV4_CONF_NOPOLICY=16,
481 NET_IPV4_CONF_FORCE_IGMP_VERSION=17,
482 NET_IPV4_CONF_ARP_ANNOUNCE=18,
483 NET_IPV4_CONF_ARP_IGNORE=19,
484 NET_IPV4_CONF_PROMOTE_SECONDARIES=20,
485 NET_IPV4_CONF_ARP_ACCEPT=21,
486 __NET_IPV4_CONF_MAX
487 };
488
489 /* /proc/sys/net/ipv4/netfilter */
490 enum
491 {
492 NET_IPV4_NF_CONNTRACK_MAX=1,
493 NET_IPV4_NF_CONNTRACK_TCP_TIMEOUT_SYN_SENT=2,
494 NET_IPV4_NF_CONNTRACK_TCP_TIMEOUT_SYN_RECV=3,
495 NET_IPV4_NF_CONNTRACK_TCP_TIMEOUT_ESTABLISHED=4,
496 NET_IPV4_NF_CONNTRACK_TCP_TIMEOUT_FIN_WAIT=5,
497 NET_IPV4_NF_CONNTRACK_TCP_TIMEOUT_CLOSE_WAIT=6,
498 NET_IPV4_NF_CONNTRACK_TCP_TIMEOUT_LAST_ACK=7,
499 NET_IPV4_NF_CONNTRACK_TCP_TIMEOUT_TIME_WAIT=8,
500 NET_IPV4_NF_CONNTRACK_TCP_TIMEOUT_CLOSE=9,
501 NET_IPV4_NF_CONNTRACK_UDP_TIMEOUT=10,
502 NET_IPV4_NF_CONNTRACK_UDP_TIMEOUT_STREAM=11,
503 NET_IPV4_NF_CONNTRACK_ICMP_TIMEOUT=12,
504 NET_IPV4_NF_CONNTRACK_GENERIC_TIMEOUT=13,
505 NET_IPV4_NF_CONNTRACK_BUCKETS=14,
506 NET_IPV4_NF_CONNTRACK_LOG_INVALID=15,
507 NET_IPV4_NF_CONNTRACK_TCP_TIMEOUT_MAX_RETRANS=16,
508 NET_IPV4_NF_CONNTRACK_TCP_LOOSE=17,
509 NET_IPV4_NF_CONNTRACK_TCP_BE_LIBERAL=18,
510 NET_IPV4_NF_CONNTRACK_TCP_MAX_RETRANS=19,
511 NET_IPV4_NF_CONNTRACK_SCTP_TIMEOUT_CLOSED=20,
512 NET_IPV4_NF_CONNTRACK_SCTP_TIMEOUT_COOKIE_WAIT=21,
513 NET_IPV4_NF_CONNTRACK_SCTP_TIMEOUT_COOKIE_ECHOED=22,
514 NET_IPV4_NF_CONNTRACK_SCTP_TIMEOUT_ESTABLISHED=23,
515 NET_IPV4_NF_CONNTRACK_SCTP_TIMEOUT_SHUTDOWN_SENT=24,
516 NET_IPV4_NF_CONNTRACK_SCTP_TIMEOUT_SHUTDOWN_RECD=25,
517 NET_IPV4_NF_CONNTRACK_SCTP_TIMEOUT_SHUTDOWN_ACK_SENT=26,
518 NET_IPV4_NF_CONNTRACK_COUNT=27,
519 NET_IPV4_NF_CONNTRACK_CHECKSUM=28,
520 };
521
522 /* /proc/sys/net/ipv6 */
523 enum {
524 NET_IPV6_CONF=16,
525 NET_IPV6_NEIGH=17,
526 NET_IPV6_ROUTE=18,
527 NET_IPV6_ICMP=19,
528 NET_IPV6_BINDV6ONLY=20,
529 NET_IPV6_IP6FRAG_HIGH_THRESH=21,
530 NET_IPV6_IP6FRAG_LOW_THRESH=22,
531 NET_IPV6_IP6FRAG_TIME=23,
532 NET_IPV6_IP6FRAG_SECRET_INTERVAL=24,
533 NET_IPV6_MLD_MAX_MSF=25,
534 };
535
536 enum {
537 NET_IPV6_ROUTE_FLUSH=1,
538 NET_IPV6_ROUTE_GC_THRESH=2,
539 NET_IPV6_ROUTE_MAX_SIZE=3,
540 NET_IPV6_ROUTE_GC_MIN_INTERVAL=4,
541 NET_IPV6_ROUTE_GC_TIMEOUT=5,
542 NET_IPV6_ROUTE_GC_INTERVAL=6,
543 NET_IPV6_ROUTE_GC_ELASTICITY=7,
544 NET_IPV6_ROUTE_MTU_EXPIRES=8,
545 NET_IPV6_ROUTE_MIN_ADVMSS=9,
546 NET_IPV6_ROUTE_GC_MIN_INTERVAL_MS=10
547 };
548
549 enum {
550 NET_IPV6_FORWARDING=1,
551 NET_IPV6_HOP_LIMIT=2,
552 NET_IPV6_MTU=3,
553 NET_IPV6_ACCEPT_RA=4,
554 NET_IPV6_ACCEPT_REDIRECTS=5,
555 NET_IPV6_AUTOCONF=6,
556 NET_IPV6_DAD_TRANSMITS=7,
557 NET_IPV6_RTR_SOLICITS=8,
558 NET_IPV6_RTR_SOLICIT_INTERVAL=9,
559 NET_IPV6_RTR_SOLICIT_DELAY=10,
560 NET_IPV6_USE_TEMPADDR=11,
561 NET_IPV6_TEMP_VALID_LFT=12,
562 NET_IPV6_TEMP_PREFERED_LFT=13,
563 NET_IPV6_REGEN_MAX_RETRY=14,
564 NET_IPV6_MAX_DESYNC_FACTOR=15,
565 NET_IPV6_MAX_ADDRESSES=16,
566 NET_IPV6_FORCE_MLD_VERSION=17,
567 NET_IPV6_ACCEPT_RA_DEFRTR=18,
568 NET_IPV6_ACCEPT_RA_PINFO=19,
569 NET_IPV6_ACCEPT_RA_RTR_PREF=20,
570 NET_IPV6_RTR_PROBE_INTERVAL=21,
571 NET_IPV6_ACCEPT_RA_RT_INFO_MAX_PLEN=22,
572 NET_IPV6_PROXY_NDP=23,
573 __NET_IPV6_MAX
574 };
575
576 /* /proc/sys/net/ipv6/icmp */
577 enum {
578 NET_IPV6_ICMP_RATELIMIT=1
579 };
580
581 /* /proc/sys/net/<protocol>/neigh/<dev> */
582 enum {
583 NET_NEIGH_MCAST_SOLICIT=1,
584 NET_NEIGH_UCAST_SOLICIT=2,
585 NET_NEIGH_APP_SOLICIT=3,
586 NET_NEIGH_RETRANS_TIME=4,
587 NET_NEIGH_REACHABLE_TIME=5,
588 NET_NEIGH_DELAY_PROBE_TIME=6,
589 NET_NEIGH_GC_STALE_TIME=7,
590 NET_NEIGH_UNRES_QLEN=8,
591 NET_NEIGH_PROXY_QLEN=9,
592 NET_NEIGH_ANYCAST_DELAY=10,
593 NET_NEIGH_PROXY_DELAY=11,
594 NET_NEIGH_LOCKTIME=12,
595 NET_NEIGH_GC_INTERVAL=13,
596 NET_NEIGH_GC_THRESH1=14,
597 NET_NEIGH_GC_THRESH2=15,
598 NET_NEIGH_GC_THRESH3=16,
599 NET_NEIGH_RETRANS_TIME_MS=17,
600 NET_NEIGH_REACHABLE_TIME_MS=18,
601 __NET_NEIGH_MAX
602 };
603
604 /* /proc/sys/net/dccp */
605 enum {
606 NET_DCCP_DEFAULT=1,
607 };
608
609 /* /proc/sys/net/dccp/default */
610 enum {
611 NET_DCCP_DEFAULT_SEQ_WINDOW = 1,
612 NET_DCCP_DEFAULT_RX_CCID = 2,
613 NET_DCCP_DEFAULT_TX_CCID = 3,
614 NET_DCCP_DEFAULT_ACK_RATIO = 4,
615 NET_DCCP_DEFAULT_SEND_ACKVEC = 5,
616 NET_DCCP_DEFAULT_SEND_NDP = 6,
617 };
618
619 /* /proc/sys/net/ipx */
620 enum {
621 NET_IPX_PPROP_BROADCASTING=1,
622 NET_IPX_FORWARDING=2
623 };
624
625 /* /proc/sys/net/llc */
626 enum {
627 NET_LLC2=1,
628 NET_LLC_STATION=2,
629 };
630
631 /* /proc/sys/net/llc/llc2 */
632 enum {
633 NET_LLC2_TIMEOUT=1,
634 };
635
636 /* /proc/sys/net/llc/station */
637 enum {
638 NET_LLC_STATION_ACK_TIMEOUT=1,
639 };
640
641 /* /proc/sys/net/llc/llc2/timeout */
642 enum {
643 NET_LLC2_ACK_TIMEOUT=1,
644 NET_LLC2_P_TIMEOUT=2,
645 NET_LLC2_REJ_TIMEOUT=3,
646 NET_LLC2_BUSY_TIMEOUT=4,
647 };
648
649 /* /proc/sys/net/appletalk */
650 enum {
651 NET_ATALK_AARP_EXPIRY_TIME=1,
652 NET_ATALK_AARP_TICK_TIME=2,
653 NET_ATALK_AARP_RETRANSMIT_LIMIT=3,
654 NET_ATALK_AARP_RESOLVE_TIME=4
655 };
656
657
658 /* /proc/sys/net/netrom */
659 enum {
660 NET_NETROM_DEFAULT_PATH_QUALITY=1,
661 NET_NETROM_OBSOLESCENCE_COUNT_INITIALISER=2,
662 NET_NETROM_NETWORK_TTL_INITIALISER=3,
663 NET_NETROM_TRANSPORT_TIMEOUT=4,
664 NET_NETROM_TRANSPORT_MAXIMUM_TRIES=5,
665 NET_NETROM_TRANSPORT_ACKNOWLEDGE_DELAY=6,
666 NET_NETROM_TRANSPORT_BUSY_DELAY=7,
667 NET_NETROM_TRANSPORT_REQUESTED_WINDOW_SIZE=8,
668 NET_NETROM_TRANSPORT_NO_ACTIVITY_TIMEOUT=9,
669 NET_NETROM_ROUTING_CONTROL=10,
670 NET_NETROM_LINK_FAILS_COUNT=11,
671 NET_NETROM_RESET=12
672 };
673
674 /* /proc/sys/net/ax25 */
675 enum {
676 NET_AX25_IP_DEFAULT_MODE=1,
677 NET_AX25_DEFAULT_MODE=2,
678 NET_AX25_BACKOFF_TYPE=3,
679 NET_AX25_CONNECT_MODE=4,
680 NET_AX25_STANDARD_WINDOW=5,
681 NET_AX25_EXTENDED_WINDOW=6,
682 NET_AX25_T1_TIMEOUT=7,
683 NET_AX25_T2_TIMEOUT=8,
684 NET_AX25_T3_TIMEOUT=9,
685 NET_AX25_IDLE_TIMEOUT=10,
686 NET_AX25_N2=11,
687 NET_AX25_PACLEN=12,
688 NET_AX25_PROTOCOL=13,
689 NET_AX25_DAMA_SLAVE_TIMEOUT=14
690 };
691
692 /* /proc/sys/net/rose */
693 enum {
694 NET_ROSE_RESTART_REQUEST_TIMEOUT=1,
695 NET_ROSE_CALL_REQUEST_TIMEOUT=2,
696 NET_ROSE_RESET_REQUEST_TIMEOUT=3,
697 NET_ROSE_CLEAR_REQUEST_TIMEOUT=4,
698 NET_ROSE_ACK_HOLD_BACK_TIMEOUT=5,
699 NET_ROSE_ROUTING_CONTROL=6,
700 NET_ROSE_LINK_FAIL_TIMEOUT=7,
701 NET_ROSE_MAX_VCS=8,
702 NET_ROSE_WINDOW_SIZE=9,
703 NET_ROSE_NO_ACTIVITY_TIMEOUT=10
704 };
705
706 /* /proc/sys/net/x25 */
707 enum {
708 NET_X25_RESTART_REQUEST_TIMEOUT=1,
709 NET_X25_CALL_REQUEST_TIMEOUT=2,
710 NET_X25_RESET_REQUEST_TIMEOUT=3,
711 NET_X25_CLEAR_REQUEST_TIMEOUT=4,
712 NET_X25_ACK_HOLD_BACK_TIMEOUT=5
713 };
714
715 /* /proc/sys/net/token-ring */
716 enum
717 {
718 NET_TR_RIF_TIMEOUT=1
719 };
720
721 /* /proc/sys/net/decnet/ */
722 enum {
723 NET_DECNET_NODE_TYPE = 1,
724 NET_DECNET_NODE_ADDRESS = 2,
725 NET_DECNET_NODE_NAME = 3,
726 NET_DECNET_DEFAULT_DEVICE = 4,
727 NET_DECNET_TIME_WAIT = 5,
728 NET_DECNET_DN_COUNT = 6,
729 NET_DECNET_DI_COUNT = 7,
730 NET_DECNET_DR_COUNT = 8,
731 NET_DECNET_DST_GC_INTERVAL = 9,
732 NET_DECNET_CONF = 10,
733 NET_DECNET_NO_FC_MAX_CWND = 11,
734 NET_DECNET_MEM = 12,
735 NET_DECNET_RMEM = 13,
736 NET_DECNET_WMEM = 14,
737 NET_DECNET_DEBUG_LEVEL = 255
738 };
739
740 /* /proc/sys/net/decnet/conf/<dev> */
741 enum {
742 NET_DECNET_CONF_LOOPBACK = -2,
743 NET_DECNET_CONF_DDCMP = -3,
744 NET_DECNET_CONF_PPP = -4,
745 NET_DECNET_CONF_X25 = -5,
746 NET_DECNET_CONF_GRE = -6,
747 NET_DECNET_CONF_ETHER = -7
748
749 /* ... and ifindex of devices */
750 };
751
752 /* /proc/sys/net/decnet/conf/<dev>/ */
753 enum {
754 NET_DECNET_CONF_DEV_PRIORITY = 1,
755 NET_DECNET_CONF_DEV_T1 = 2,
756 NET_DECNET_CONF_DEV_T2 = 3,
757 NET_DECNET_CONF_DEV_T3 = 4,
758 NET_DECNET_CONF_DEV_FORWARDING = 5,
759 NET_DECNET_CONF_DEV_BLKSIZE = 6,
760 NET_DECNET_CONF_DEV_STATE = 7
761 };
762
763 /* /proc/sys/net/sctp */
764 enum {
765 NET_SCTP_RTO_INITIAL = 1,
766 NET_SCTP_RTO_MIN = 2,
767 NET_SCTP_RTO_MAX = 3,
768 NET_SCTP_RTO_ALPHA = 4,
769 NET_SCTP_RTO_BETA = 5,
770 NET_SCTP_VALID_COOKIE_LIFE = 6,
771 NET_SCTP_ASSOCIATION_MAX_RETRANS = 7,
772 NET_SCTP_PATH_MAX_RETRANS = 8,
773 NET_SCTP_MAX_INIT_RETRANSMITS = 9,
774 NET_SCTP_HB_INTERVAL = 10,
775 NET_SCTP_PRESERVE_ENABLE = 11,
776 NET_SCTP_MAX_BURST = 12,
777 NET_SCTP_ADDIP_ENABLE = 13,
778 NET_SCTP_PRSCTP_ENABLE = 14,
779 NET_SCTP_SNDBUF_POLICY = 15,
780 NET_SCTP_SACK_TIMEOUT = 16,
781 NET_SCTP_RCVBUF_POLICY = 17,
782 };
783
784 /* /proc/sys/net/bridge */
785 enum {
786 NET_BRIDGE_NF_CALL_ARPTABLES = 1,
787 NET_BRIDGE_NF_CALL_IPTABLES = 2,
788 NET_BRIDGE_NF_CALL_IP6TABLES = 3,
789 NET_BRIDGE_NF_FILTER_VLAN_TAGGED = 4,
790 };
791
792 /* CTL_FS names: */
793 enum
794 {
795 FS_NRINODE=1, /* int:current number of allocated inodes */
796 FS_STATINODE=2,
797 FS_MAXINODE=3, /* int:maximum number of inodes that can be allocated */
798 FS_NRDQUOT=4, /* int:current number of allocated dquots */
799 FS_MAXDQUOT=5, /* int:maximum number of dquots that can be allocated */
800 FS_NRFILE=6, /* int:current number of allocated filedescriptors */
801 FS_MAXFILE=7, /* int:maximum number of filedescriptors that can be allocated */
802 FS_DENTRY=8,
803 FS_NRSUPER=9, /* int:current number of allocated super_blocks */
804 FS_MAXSUPER=10, /* int:maximum number of super_blocks that can be allocated */
805 FS_OVERFLOWUID=11, /* int: overflow UID */
806 FS_OVERFLOWGID=12, /* int: overflow GID */
807 FS_LEASES=13, /* int: leases enabled */
808 FS_DIR_NOTIFY=14, /* int: directory notification enabled */
809 FS_LEASE_TIME=15, /* int: maximum time to wait for a lease break */
810 FS_DQSTATS=16, /* disc quota usage statistics and control */
811 FS_XFS=17, /* struct: control xfs parameters */
812 FS_AIO_NR=18, /* current system-wide number of aio requests */
813 FS_AIO_MAX_NR=19, /* system-wide maximum number of aio requests */
814 FS_INOTIFY=20, /* inotify submenu */
815 };
816
817 /* /proc/sys/fs/quota/ */
818 enum {
819 FS_DQ_LOOKUPS = 1,
820 FS_DQ_DROPS = 2,
821 FS_DQ_READS = 3,
822 FS_DQ_WRITES = 4,
823 FS_DQ_CACHE_HITS = 5,
824 FS_DQ_ALLOCATED = 6,
825 FS_DQ_FREE = 7,
826 FS_DQ_SYNCS = 8,
827 FS_DQ_WARNINGS = 9,
828 };
829
830 /* CTL_DEBUG names: */
831
832 /* CTL_DEV names: */
833 enum {
834 DEV_CDROM=1,
835 DEV_HWMON=2,
836 DEV_PARPORT=3,
837 DEV_RAID=4,
838 DEV_MAC_HID=5,
839 DEV_SCSI=6,
840 DEV_IPMI=7,
841 };
842
843 /* /proc/sys/dev/cdrom */
844 enum {
845 DEV_CDROM_INFO=1,
846 DEV_CDROM_AUTOCLOSE=2,
847 DEV_CDROM_AUTOEJECT=3,
848 DEV_CDROM_DEBUG=4,
849 DEV_CDROM_LOCK=5,
850 DEV_CDROM_CHECK_MEDIA=6
851 };
852
853 /* /proc/sys/dev/parport */
854 enum {
855 DEV_PARPORT_DEFAULT=-3
856 };
857
858 /* /proc/sys/dev/raid */
859 enum {
860 DEV_RAID_SPEED_LIMIT_MIN=1,
861 DEV_RAID_SPEED_LIMIT_MAX=2
862 };
863
864 /* /proc/sys/dev/parport/default */
865 enum {
866 DEV_PARPORT_DEFAULT_TIMESLICE=1,
867 DEV_PARPORT_DEFAULT_SPINTIME=2
868 };
869
870 /* /proc/sys/dev/parport/parport n */
871 enum {
872 DEV_PARPORT_SPINTIME=1,
873 DEV_PARPORT_BASE_ADDR=2,
874 DEV_PARPORT_IRQ=3,
875 DEV_PARPORT_DMA=4,
876 DEV_PARPORT_MODES=5,
877 DEV_PARPORT_DEVICES=6,
878 DEV_PARPORT_AUTOPROBE=16
879 };
880
881 /* /proc/sys/dev/parport/parport n/devices/ */
882 enum {
883 DEV_PARPORT_DEVICES_ACTIVE=-3,
884 };
885
886 /* /proc/sys/dev/parport/parport n/devices/device n */
887 enum {
888 DEV_PARPORT_DEVICE_TIMESLICE=1,
889 };
890
891 /* /proc/sys/dev/mac_hid */
892 enum {
893 DEV_MAC_HID_KEYBOARD_SENDS_LINUX_KEYCODES=1,
894 DEV_MAC_HID_KEYBOARD_LOCK_KEYCODES=2,
895 DEV_MAC_HID_MOUSE_BUTTON_EMULATION=3,
896 DEV_MAC_HID_MOUSE_BUTTON2_KEYCODE=4,
897 DEV_MAC_HID_MOUSE_BUTTON3_KEYCODE=5,
898 DEV_MAC_HID_ADB_MOUSE_SENDS_KEYCODES=6
899 };
900
901 /* /proc/sys/dev/scsi */
902 enum {
903 DEV_SCSI_LOGGING_LEVEL=1,
904 };
905
906 /* /proc/sys/dev/ipmi */
907 enum {
908 DEV_IPMI_POWEROFF_POWERCYCLE=1,
909 };
910
911 /* /proc/sys/abi */
912 enum
913 {
914 ABI_DEFHANDLER_COFF=1, /* default handler for coff binaries */
915 ABI_DEFHANDLER_ELF=2, /* default handler for ELF binaries */
916 ABI_DEFHANDLER_LCALL7=3,/* default handler for procs using lcall7 */
917 ABI_DEFHANDLER_LIBCSO=4,/* default handler for an libc.so ELF interp */
918 ABI_TRACE=5, /* tracing flags */
919 ABI_FAKE_UTSNAME=6, /* fake target utsname information */
920 };
921
922 #ifdef __KERNEL__
923 #include <linux/list.h>
924
925 extern void sysctl_init(void);
926
927 typedef struct ctl_table ctl_table;
928
929 typedef int ctl_handler (ctl_table *table, int __user *name, int nlen,
930 void __user *oldval, size_t __user *oldlenp,
931 void __user *newval, size_t newlen,
932 void **context);
933
934 typedef int proc_handler (ctl_table *ctl, int write, struct file * filp,
935 void __user *buffer, size_t *lenp, loff_t *ppos);
936
937 extern int proc_dostring(ctl_table *, int, struct file *,
938 void __user *, size_t *, loff_t *);
939 extern int proc_dointvec(ctl_table *, int, struct file *,
940 void __user *, size_t *, loff_t *);
941 extern int proc_dointvec_bset(ctl_table *, int, struct file *,
942 void __user *, size_t *, loff_t *);
943 extern int proc_dointvec_minmax(ctl_table *, int, struct file *,
944 void __user *, size_t *, loff_t *);
945 extern int proc_dointvec_jiffies(ctl_table *, int, struct file *,
946 void __user *, size_t *, loff_t *);
947 extern int proc_dointvec_userhz_jiffies(ctl_table *, int, struct file *,
948 void __user *, size_t *, loff_t *);
949 extern int proc_dointvec_ms_jiffies(ctl_table *, int, struct file *,
950 void __user *, size_t *, loff_t *);
951 extern int proc_doulongvec_minmax(ctl_table *, int, struct file *,
952 void __user *, size_t *, loff_t *);
953 extern int proc_doulongvec_ms_jiffies_minmax(ctl_table *table, int,
954 struct file *, void __user *, size_t *, loff_t *);
955
956 extern int do_sysctl (int __user *name, int nlen,
957 void __user *oldval, size_t __user *oldlenp,
958 void __user *newval, size_t newlen);
959
960 extern int do_sysctl_strategy (ctl_table *table,
961 int __user *name, int nlen,
962 void __user *oldval, size_t __user *oldlenp,
963 void __user *newval, size_t newlen, void ** context);
964
965 extern ctl_handler sysctl_string;
966 extern ctl_handler sysctl_intvec;
967 extern ctl_handler sysctl_jiffies;
968 extern ctl_handler sysctl_ms_jiffies;
969
970
971 /*
972 * Register a set of sysctl names by calling register_sysctl_table
973 * with an initialised array of ctl_table's. An entry with zero
974 * ctl_name and NULL procname terminates the table. table->de will be
975 * set up by the registration and need not be initialised in advance.
976 *
977 * sysctl names can be mirrored automatically under /proc/sys. The
978 * procname supplied controls /proc naming.
979 *
980 * The table's mode will be honoured both for sys_sysctl(2) and
981 * proc-fs access.
982 *
983 * Leaf nodes in the sysctl tree will be represented by a single file
984 * under /proc; non-leaf nodes will be represented by directories. A
985 * null procname disables /proc mirroring at this node.
986 *
987 * sysctl entries with a zero ctl_name will not be available through
988 * the binary sysctl interface.
989 *
990 * sysctl(2) can automatically manage read and write requests through
991 * the sysctl table. The data and maxlen fields of the ctl_table
992 * struct enable minimal validation of the values being written to be
993 * performed, and the mode field allows minimal authentication.
994 *
995 * More sophisticated management can be enabled by the provision of a
996 * strategy routine with the table entry. This will be called before
997 * any automatic read or write of the data is performed.
998 *
999 * The strategy routine may return:
1000 * <0: Error occurred (error is passed to user process)
1001 * 0: OK - proceed with automatic read or write.
1002 * >0: OK - read or write has been done by the strategy routine, so
1003 * return immediately.
1004 *
1005 * There must be a proc_handler routine for any terminal nodes
1006 * mirrored under /proc/sys (non-terminals are handled by a built-in
1007 * directory handler). Several default handlers are available to
1008 * cover common cases.
1009 */
1010
1011 /* A sysctl table is an array of struct ctl_table: */
1012 struct ctl_table
1013 {
1014 int ctl_name; /* Binary ID */
1015 const char *procname; /* Text ID for /proc/sys, or zero */
1016 void *data;
1017 int maxlen;
1018 mode_t mode;
1019 ctl_table *child;
1020 proc_handler *proc_handler; /* Callback for text formatting */
1021 ctl_handler *strategy; /* Callback function for all r/w */
1022 struct proc_dir_entry *de; /* /proc control block */
1023 void *extra1;
1024 void *extra2;
1025 };
1026
1027 /* struct ctl_table_header is used to maintain dynamic lists of
1028 ctl_table trees. */
1029 struct ctl_table_header
1030 {
1031 ctl_table *ctl_table;
1032 struct list_head ctl_entry;
1033 int used;
1034 struct completion *unregistering;
1035 };
1036
1037 struct ctl_table_header * register_sysctl_table(ctl_table * table,
1038 int insert_at_head);
1039 void unregister_sysctl_table(struct ctl_table_header * table);
1040
1041 #else /* __KERNEL__ */
1042
1043 #endif /* __KERNEL__ */
1044
1045 #endif /* _LINUX_SYSCTL_H */
kernel-based virtual machine