2 * sysctl_net_ipv4.c: sysctl interface to net IPV4 subsystem.
4 * $Id: sysctl_net_ipv4.c,v 1.50 2001/10/20 00:00:11 davem Exp $
6 * Begun April 1, 1996, Mike Shaver.
7 * Added /proc/sys/net/ipv4 directory entry (empty =) ). [MS]
11 #include <linux/module.h>
12 #include <linux/sysctl.h>
13 #include <linux/config.h>
14 #include <linux/igmp.h>
15 #include <linux/inetdevice.h>
19 #include <net/route.h>
23 extern int sysctl_ip_nonlocal_bind;
27 static int tcp_retr1_max = 255;
28 static int ip_local_port_range_min[] = { 1, 1 };
29 static int ip_local_port_range_max[] = { 65535, 65535 };
32 struct ipv4_config ipv4_config;
37 int ipv4_sysctl_forward(ctl_table *ctl, int write, struct file * filp,
38 void __user *buffer, size_t *lenp, loff_t *ppos)
40 int val = ipv4_devconf.forwarding;
43 ret = proc_dointvec(ctl, write, filp, buffer, lenp, ppos);
45 if (write && ipv4_devconf.forwarding != val)
46 inet_forward_change();
51 static int ipv4_sysctl_forward_strategy(ctl_table *table,
52 int __user *name, int nlen,
53 void __user *oldval, size_t __user *oldlenp,
54 void __user *newval, size_t newlen,
57 int *valp = table->data;
60 if (!newval || !newlen)
63 if (newlen != sizeof(int))
66 if (get_user(new, (int __user *)newval))
72 if (oldval && oldlenp) {
75 if (get_user(len, oldlenp))
79 if (len > table->maxlen)
81 if (copy_to_user(oldval, valp, len))
83 if (put_user(len, oldlenp))
89 inet_forward_change();
93 static int proc_tcp_congestion_control(ctl_table *ctl, int write, struct file * filp,
94 void __user *buffer, size_t *lenp, loff_t *ppos)
96 char val[TCP_CA_NAME_MAX];
99 .maxlen = TCP_CA_NAME_MAX,
103 tcp_get_default_congestion_control(val);
105 ret = proc_dostring(&tbl, write, filp, buffer, lenp, ppos);
106 if (write && ret == 0)
107 ret = tcp_set_default_congestion_control(val);
111 static int sysctl_tcp_congestion_control(ctl_table *table, int __user *name,
112 int nlen, void __user *oldval,
113 size_t __user *oldlenp,
114 void __user *newval, size_t newlen,
117 char val[TCP_CA_NAME_MAX];
120 .maxlen = TCP_CA_NAME_MAX,
124 tcp_get_default_congestion_control(val);
125 ret = sysctl_string(&tbl, name, nlen, oldval, oldlenp, newval, newlen,
127 if (ret == 0 && newval && newlen)
128 ret = tcp_set_default_congestion_control(val);
133 ctl_table ipv4_table[] = {
135 .ctl_name = NET_IPV4_TCP_TIMESTAMPS,
136 .procname = "tcp_timestamps",
137 .data = &sysctl_tcp_timestamps,
138 .maxlen = sizeof(int),
140 .proc_handler = &proc_dointvec
143 .ctl_name = NET_IPV4_TCP_WINDOW_SCALING,
144 .procname = "tcp_window_scaling",
145 .data = &sysctl_tcp_window_scaling,
146 .maxlen = sizeof(int),
148 .proc_handler = &proc_dointvec
151 .ctl_name = NET_IPV4_TCP_SACK,
152 .procname = "tcp_sack",
153 .data = &sysctl_tcp_sack,
154 .maxlen = sizeof(int),
156 .proc_handler = &proc_dointvec
159 .ctl_name = NET_IPV4_TCP_RETRANS_COLLAPSE,
160 .procname = "tcp_retrans_collapse",
161 .data = &sysctl_tcp_retrans_collapse,
162 .maxlen = sizeof(int),
164 .proc_handler = &proc_dointvec
167 .ctl_name = NET_IPV4_FORWARD,
168 .procname = "ip_forward",
169 .data = &ipv4_devconf.forwarding,
170 .maxlen = sizeof(int),
172 .proc_handler = &ipv4_sysctl_forward,
173 .strategy = &ipv4_sysctl_forward_strategy
176 .ctl_name = NET_IPV4_DEFAULT_TTL,
177 .procname = "ip_default_ttl",
178 .data = &sysctl_ip_default_ttl,
179 .maxlen = sizeof(int),
181 .proc_handler = &ipv4_doint_and_flush,
182 .strategy = &ipv4_doint_and_flush_strategy,
185 .ctl_name = NET_IPV4_AUTOCONFIG,
186 .procname = "ip_autoconfig",
187 .data = &ipv4_config.autoconfig,
188 .maxlen = sizeof(int),
190 .proc_handler = &proc_dointvec
193 .ctl_name = NET_IPV4_NO_PMTU_DISC,
194 .procname = "ip_no_pmtu_disc",
195 .data = &ipv4_config.no_pmtu_disc,
196 .maxlen = sizeof(int),
198 .proc_handler = &proc_dointvec
201 .ctl_name = NET_IPV4_NONLOCAL_BIND,
202 .procname = "ip_nonlocal_bind",
203 .data = &sysctl_ip_nonlocal_bind,
204 .maxlen = sizeof(int),
206 .proc_handler = &proc_dointvec
209 .ctl_name = NET_IPV4_TCP_SYN_RETRIES,
210 .procname = "tcp_syn_retries",
211 .data = &sysctl_tcp_syn_retries,
212 .maxlen = sizeof(int),
214 .proc_handler = &proc_dointvec
217 .ctl_name = NET_TCP_SYNACK_RETRIES,
218 .procname = "tcp_synack_retries",
219 .data = &sysctl_tcp_synack_retries,
220 .maxlen = sizeof(int),
222 .proc_handler = &proc_dointvec
225 .ctl_name = NET_TCP_MAX_ORPHANS,
226 .procname = "tcp_max_orphans",
227 .data = &sysctl_tcp_max_orphans,
228 .maxlen = sizeof(int),
230 .proc_handler = &proc_dointvec
233 .ctl_name = NET_TCP_MAX_TW_BUCKETS,
234 .procname = "tcp_max_tw_buckets",
235 .data = &tcp_death_row.sysctl_max_tw_buckets,
236 .maxlen = sizeof(int),
238 .proc_handler = &proc_dointvec
241 .ctl_name = NET_IPV4_IPFRAG_HIGH_THRESH,
242 .procname = "ipfrag_high_thresh",
243 .data = &sysctl_ipfrag_high_thresh,
244 .maxlen = sizeof(int),
246 .proc_handler = &proc_dointvec
249 .ctl_name = NET_IPV4_IPFRAG_LOW_THRESH,
250 .procname = "ipfrag_low_thresh",
251 .data = &sysctl_ipfrag_low_thresh,
252 .maxlen = sizeof(int),
254 .proc_handler = &proc_dointvec
257 .ctl_name = NET_IPV4_DYNADDR,
258 .procname = "ip_dynaddr",
259 .data = &sysctl_ip_dynaddr,
260 .maxlen = sizeof(int),
262 .proc_handler = &proc_dointvec
265 .ctl_name = NET_IPV4_IPFRAG_TIME,
266 .procname = "ipfrag_time",
267 .data = &sysctl_ipfrag_time,
268 .maxlen = sizeof(int),
270 .proc_handler = &proc_dointvec_jiffies,
271 .strategy = &sysctl_jiffies
274 .ctl_name = NET_IPV4_TCP_KEEPALIVE_TIME,
275 .procname = "tcp_keepalive_time",
276 .data = &sysctl_tcp_keepalive_time,
277 .maxlen = sizeof(int),
279 .proc_handler = &proc_dointvec_jiffies,
280 .strategy = &sysctl_jiffies
283 .ctl_name = NET_IPV4_TCP_KEEPALIVE_PROBES,
284 .procname = "tcp_keepalive_probes",
285 .data = &sysctl_tcp_keepalive_probes,
286 .maxlen = sizeof(int),
288 .proc_handler = &proc_dointvec
291 .ctl_name = NET_IPV4_TCP_KEEPALIVE_INTVL,
292 .procname = "tcp_keepalive_intvl",
293 .data = &sysctl_tcp_keepalive_intvl,
294 .maxlen = sizeof(int),
296 .proc_handler = &proc_dointvec_jiffies,
297 .strategy = &sysctl_jiffies
300 .ctl_name = NET_IPV4_TCP_RETRIES1,
301 .procname = "tcp_retries1",
302 .data = &sysctl_tcp_retries1,
303 .maxlen = sizeof(int),
305 .proc_handler = &proc_dointvec_minmax,
306 .strategy = &sysctl_intvec,
307 .extra2 = &tcp_retr1_max
310 .ctl_name = NET_IPV4_TCP_RETRIES2,
311 .procname = "tcp_retries2",
312 .data = &sysctl_tcp_retries2,
313 .maxlen = sizeof(int),
315 .proc_handler = &proc_dointvec
318 .ctl_name = NET_IPV4_TCP_FIN_TIMEOUT,
319 .procname = "tcp_fin_timeout",
320 .data = &sysctl_tcp_fin_timeout,
321 .maxlen = sizeof(int),
323 .proc_handler = &proc_dointvec_jiffies,
324 .strategy = &sysctl_jiffies
326 #ifdef CONFIG_SYN_COOKIES
328 .ctl_name = NET_TCP_SYNCOOKIES,
329 .procname = "tcp_syncookies",
330 .data = &sysctl_tcp_syncookies,
331 .maxlen = sizeof(int),
333 .proc_handler = &proc_dointvec
337 .ctl_name = NET_TCP_TW_RECYCLE,
338 .procname = "tcp_tw_recycle",
339 .data = &tcp_death_row.sysctl_tw_recycle,
340 .maxlen = sizeof(int),
342 .proc_handler = &proc_dointvec
345 .ctl_name = NET_TCP_ABORT_ON_OVERFLOW,
346 .procname = "tcp_abort_on_overflow",
347 .data = &sysctl_tcp_abort_on_overflow,
348 .maxlen = sizeof(int),
350 .proc_handler = &proc_dointvec
353 .ctl_name = NET_TCP_STDURG,
354 .procname = "tcp_stdurg",
355 .data = &sysctl_tcp_stdurg,
356 .maxlen = sizeof(int),
358 .proc_handler = &proc_dointvec
361 .ctl_name = NET_TCP_RFC1337,
362 .procname = "tcp_rfc1337",
363 .data = &sysctl_tcp_rfc1337,
364 .maxlen = sizeof(int),
366 .proc_handler = &proc_dointvec
369 .ctl_name = NET_TCP_MAX_SYN_BACKLOG,
370 .procname = "tcp_max_syn_backlog",
371 .data = &sysctl_max_syn_backlog,
372 .maxlen = sizeof(int),
374 .proc_handler = &proc_dointvec
377 .ctl_name = NET_IPV4_LOCAL_PORT_RANGE,
378 .procname = "ip_local_port_range",
379 .data = &sysctl_local_port_range,
380 .maxlen = sizeof(sysctl_local_port_range),
382 .proc_handler = &proc_dointvec_minmax,
383 .strategy = &sysctl_intvec,
384 .extra1 = ip_local_port_range_min,
385 .extra2 = ip_local_port_range_max
388 .ctl_name = NET_IPV4_ICMP_ECHO_IGNORE_ALL,
389 .procname = "icmp_echo_ignore_all",
390 .data = &sysctl_icmp_echo_ignore_all,
391 .maxlen = sizeof(int),
393 .proc_handler = &proc_dointvec
396 .ctl_name = NET_IPV4_ICMP_ECHO_IGNORE_BROADCASTS,
397 .procname = "icmp_echo_ignore_broadcasts",
398 .data = &sysctl_icmp_echo_ignore_broadcasts,
399 .maxlen = sizeof(int),
401 .proc_handler = &proc_dointvec
404 .ctl_name = NET_IPV4_ICMP_IGNORE_BOGUS_ERROR_RESPONSES,
405 .procname = "icmp_ignore_bogus_error_responses",
406 .data = &sysctl_icmp_ignore_bogus_error_responses,
407 .maxlen = sizeof(int),
409 .proc_handler = &proc_dointvec
411 #ifdef CONFIG_ICMP_IPOD
413 .ctl_name = NET_IPV4_ICMP_IPOD_VERSION,
414 .procname = "icmp_ipod_version",
415 .data = &sysctl_icmp_ipod_version,
416 .maxlen = sizeof(sysctl_icmp_ipod_version),
418 .proc_handler = &proc_dointvec
421 .ctl_name = NET_IPV4_ICMP_IPOD_ENABLED,
422 .procname = "icmp_ipod_enabled",
423 .data = &sysctl_icmp_ipod_enabled,
424 .maxlen = sizeof(sysctl_icmp_ipod_enabled),
426 .proc_handler = &proc_dointvec
429 .ctl_name = NET_IPV4_ICMP_IPOD_HOST,
430 .procname = "icmp_ipod_host",
431 .data = &sysctl_icmp_ipod_host,
432 .maxlen = sizeof(sysctl_icmp_ipod_host),
434 .proc_handler = &proc_dointvec
437 .ctl_name = NET_IPV4_ICMP_IPOD_MASK,
438 .procname = "icmp_ipod_mask",
439 .data = &sysctl_icmp_ipod_mask,
440 .maxlen = sizeof(sysctl_icmp_ipod_mask),
442 .proc_handler = &proc_dointvec
445 .ctl_name = NET_IPV4_ICMP_IPOD_KEY,
446 .procname = "icmp_ipod_key",
447 .data = &sysctl_icmp_ipod_key,
448 .maxlen = sizeof(sysctl_icmp_ipod_key),
450 .proc_handler = &proc_dostring,
451 .strategy = &sysctl_string
455 .ctl_name = NET_IPV4_ICMP_ERRORS_USE_INBOUND_IFADDR,
456 .procname = "icmp_errors_use_inbound_ifaddr",
457 .data = &sysctl_icmp_errors_use_inbound_ifaddr,
458 .maxlen = sizeof(int),
460 .proc_handler = &proc_dointvec
463 .ctl_name = NET_IPV4_ROUTE,
467 .child = ipv4_route_table
469 #ifdef CONFIG_IP_MULTICAST
471 .ctl_name = NET_IPV4_IGMP_MAX_MEMBERSHIPS,
472 .procname = "igmp_max_memberships",
473 .data = &sysctl_igmp_max_memberships,
474 .maxlen = sizeof(int),
476 .proc_handler = &proc_dointvec
481 .ctl_name = NET_IPV4_IGMP_MAX_MSF,
482 .procname = "igmp_max_msf",
483 .data = &sysctl_igmp_max_msf,
484 .maxlen = sizeof(int),
486 .proc_handler = &proc_dointvec
489 .ctl_name = NET_IPV4_INET_PEER_THRESHOLD,
490 .procname = "inet_peer_threshold",
491 .data = &inet_peer_threshold,
492 .maxlen = sizeof(int),
494 .proc_handler = &proc_dointvec
497 .ctl_name = NET_IPV4_INET_PEER_MINTTL,
498 .procname = "inet_peer_minttl",
499 .data = &inet_peer_minttl,
500 .maxlen = sizeof(int),
502 .proc_handler = &proc_dointvec_jiffies,
503 .strategy = &sysctl_jiffies
506 .ctl_name = NET_IPV4_INET_PEER_MAXTTL,
507 .procname = "inet_peer_maxttl",
508 .data = &inet_peer_maxttl,
509 .maxlen = sizeof(int),
511 .proc_handler = &proc_dointvec_jiffies,
512 .strategy = &sysctl_jiffies
515 .ctl_name = NET_IPV4_INET_PEER_GC_MINTIME,
516 .procname = "inet_peer_gc_mintime",
517 .data = &inet_peer_gc_mintime,
518 .maxlen = sizeof(int),
520 .proc_handler = &proc_dointvec_jiffies,
521 .strategy = &sysctl_jiffies
524 .ctl_name = NET_IPV4_INET_PEER_GC_MAXTIME,
525 .procname = "inet_peer_gc_maxtime",
526 .data = &inet_peer_gc_maxtime,
527 .maxlen = sizeof(int),
529 .proc_handler = &proc_dointvec_jiffies,
530 .strategy = &sysctl_jiffies
533 .ctl_name = NET_TCP_ORPHAN_RETRIES,
534 .procname = "tcp_orphan_retries",
535 .data = &sysctl_tcp_orphan_retries,
536 .maxlen = sizeof(int),
538 .proc_handler = &proc_dointvec
541 .ctl_name = NET_TCP_FACK,
542 .procname = "tcp_fack",
543 .data = &sysctl_tcp_fack,
544 .maxlen = sizeof(int),
546 .proc_handler = &proc_dointvec
549 .ctl_name = NET_TCP_REORDERING,
550 .procname = "tcp_reordering",
551 .data = &sysctl_tcp_reordering,
552 .maxlen = sizeof(int),
554 .proc_handler = &proc_dointvec
557 .ctl_name = NET_TCP_ECN,
558 .procname = "tcp_ecn",
559 .data = &sysctl_tcp_ecn,
560 .maxlen = sizeof(int),
562 .proc_handler = &proc_dointvec
565 .ctl_name = NET_TCP_DSACK,
566 .procname = "tcp_dsack",
567 .data = &sysctl_tcp_dsack,
568 .maxlen = sizeof(int),
570 .proc_handler = &proc_dointvec
573 .ctl_name = NET_TCP_MEM,
574 .procname = "tcp_mem",
575 .data = &sysctl_tcp_mem,
576 .maxlen = sizeof(sysctl_tcp_mem),
578 .proc_handler = &proc_dointvec
581 .ctl_name = NET_TCP_WMEM,
582 .procname = "tcp_wmem",
583 .data = &sysctl_tcp_wmem,
584 .maxlen = sizeof(sysctl_tcp_wmem),
586 .proc_handler = &proc_dointvec
589 .ctl_name = NET_TCP_RMEM,
590 .procname = "tcp_rmem",
591 .data = &sysctl_tcp_rmem,
592 .maxlen = sizeof(sysctl_tcp_rmem),
594 .proc_handler = &proc_dointvec
597 .ctl_name = NET_TCP_APP_WIN,
598 .procname = "tcp_app_win",
599 .data = &sysctl_tcp_app_win,
600 .maxlen = sizeof(int),
602 .proc_handler = &proc_dointvec
605 .ctl_name = NET_TCP_ADV_WIN_SCALE,
606 .procname = "tcp_adv_win_scale",
607 .data = &sysctl_tcp_adv_win_scale,
608 .maxlen = sizeof(int),
610 .proc_handler = &proc_dointvec
613 .ctl_name = NET_IPV4_ICMP_RATELIMIT,
614 .procname = "icmp_ratelimit",
615 .data = &sysctl_icmp_ratelimit,
616 .maxlen = sizeof(int),
618 .proc_handler = &proc_dointvec
621 .ctl_name = NET_IPV4_ICMP_RATEMASK,
622 .procname = "icmp_ratemask",
623 .data = &sysctl_icmp_ratemask,
624 .maxlen = sizeof(int),
626 .proc_handler = &proc_dointvec
629 .ctl_name = NET_TCP_TW_REUSE,
630 .procname = "tcp_tw_reuse",
631 .data = &sysctl_tcp_tw_reuse,
632 .maxlen = sizeof(int),
634 .proc_handler = &proc_dointvec
637 .ctl_name = NET_TCP_FRTO,
638 .procname = "tcp_frto",
639 .data = &sysctl_tcp_frto,
640 .maxlen = sizeof(int),
642 .proc_handler = &proc_dointvec
645 .ctl_name = NET_TCP_LOW_LATENCY,
646 .procname = "tcp_low_latency",
647 .data = &sysctl_tcp_low_latency,
648 .maxlen = sizeof(int),
650 .proc_handler = &proc_dointvec
653 .ctl_name = NET_IPV4_IPFRAG_SECRET_INTERVAL,
654 .procname = "ipfrag_secret_interval",
655 .data = &sysctl_ipfrag_secret_interval,
656 .maxlen = sizeof(int),
658 .proc_handler = &proc_dointvec_jiffies,
659 .strategy = &sysctl_jiffies
662 .ctl_name = NET_IPV4_IPFRAG_MAX_DIST,
663 .procname = "ipfrag_max_dist",
664 .data = &sysctl_ipfrag_max_dist,
665 .maxlen = sizeof(int),
667 .proc_handler = &proc_dointvec_minmax,
671 .ctl_name = NET_TCP_NO_METRICS_SAVE,
672 .procname = "tcp_no_metrics_save",
673 .data = &sysctl_tcp_nometrics_save,
674 .maxlen = sizeof(int),
676 .proc_handler = &proc_dointvec,
679 .ctl_name = NET_TCP_MODERATE_RCVBUF,
680 .procname = "tcp_moderate_rcvbuf",
681 .data = &sysctl_tcp_moderate_rcvbuf,
682 .maxlen = sizeof(int),
684 .proc_handler = &proc_dointvec,
687 .ctl_name = NET_TCP_TSO_WIN_DIVISOR,
688 .procname = "tcp_tso_win_divisor",
689 .data = &sysctl_tcp_tso_win_divisor,
690 .maxlen = sizeof(int),
692 .proc_handler = &proc_dointvec,
695 .ctl_name = NET_TCP_CONG_CONTROL,
696 .procname = "tcp_congestion_control",
698 .maxlen = TCP_CA_NAME_MAX,
699 .proc_handler = &proc_tcp_congestion_control,
700 .strategy = &sysctl_tcp_congestion_control,
703 .ctl_name = NET_TCP_ABC,
704 .procname = "tcp_abc",
705 .data = &sysctl_tcp_abc,
706 .maxlen = sizeof(int),
708 .proc_handler = &proc_dointvec,
711 .ctl_name = NET_TCP_MTU_PROBING,
712 .procname = "tcp_mtu_probing",
713 .data = &sysctl_tcp_mtu_probing,
714 .maxlen = sizeof(int),
716 .proc_handler = &proc_dointvec,
719 .ctl_name = NET_TCP_BASE_MSS,
720 .procname = "tcp_base_mss",
721 .data = &sysctl_tcp_base_mss,
722 .maxlen = sizeof(int),
724 .proc_handler = &proc_dointvec,
727 .ctl_name = NET_IPV4_TCP_WORKAROUND_SIGNED_WINDOWS,
728 .procname = "tcp_workaround_signed_windows",
729 .data = &sysctl_tcp_workaround_signed_windows,
730 .maxlen = sizeof(int),
732 .proc_handler = &proc_dointvec
737 #endif /* CONFIG_SYSCTL */
739 EXPORT_SYMBOL(ipv4_config);