xref: /linux/net/ipv4/sysctl_net_ipv4.c (revision 9ce7677cfd7cd871adb457c80bea3b581b839641) 
1 /*
2  * sysctl_net_ipv4.c: sysctl interface to net IPV4 subsystem.
3  *
4  * $Id: sysctl_net_ipv4.c,v 1.50 2001/10/20 00:00:11 davem Exp $
5  *
6  * Begun April 1, 1996, Mike Shaver.
7  * Added /proc/sys/net/ipv4 directory entry (empty =) ). [MS]
8  */
9 
10 #include <linux/mm.h>
11 #include <linux/module.h>
12 #include <linux/sysctl.h>
13 #include <linux/config.h>
14 #include <linux/igmp.h>
15 #include <net/snmp.h>
16 #include <net/icmp.h>
17 #include <net/ip.h>
18 #include <net/route.h>
19 #include <net/tcp.h>
20 
21 /* From af_inet.c */
22 extern int sysctl_ip_nonlocal_bind;
23 
24 #ifdef CONFIG_SYSCTL
25 static int tcp_retr1_max = 255;
26 static int ip_local_port_range_min[] = { 1, 1 };
27 static int ip_local_port_range_max[] = { 65535, 65535 };
28 #endif
29 
30 struct ipv4_config ipv4_config;
31 
32 #ifdef CONFIG_SYSCTL
33 
34 static
35 int ipv4_sysctl_forward(ctl_table *ctl, int write, struct file * filp,
36 			void __user *buffer, size_t *lenp, loff_t *ppos)
37 {
38 	int val = ipv4_devconf.forwarding;
39 	int ret;
40 
41 	ret = proc_dointvec(ctl, write, filp, buffer, lenp, ppos);
42 
43 	if (write && ipv4_devconf.forwarding != val)
44 		inet_forward_change();
45 
46 	return ret;
47 }
48 
49 static int ipv4_sysctl_forward_strategy(ctl_table *table,
50 			 int __user *name, int nlen,
51 			 void __user *oldval, size_t __user *oldlenp,
52 			 void __user *newval, size_t newlen,
53 			 void **context)
54 {
55 	int *valp = table->data;
56 	int new;
57 
58 	if (!newval || !newlen)
59 		return 0;
60 
61 	if (newlen != sizeof(int))
62 		return -EINVAL;
63 
64 	if (get_user(new, (int __user *)newval))
65 		return -EFAULT;
66 
67 	if (new == *valp)
68 		return 0;
69 
70 	if (oldval && oldlenp) {
71 		size_t len;
72 
73 		if (get_user(len, oldlenp))
74 			return -EFAULT;
75 
76 		if (len) {
77 			if (len > table->maxlen)
78 				len = table->maxlen;
79 			if (copy_to_user(oldval, valp, len))
80 				return -EFAULT;
81 			if (put_user(len, oldlenp))
82 				return -EFAULT;
83 		}
84 	}
85 
86 	*valp = new;
87 	inet_forward_change();
88 	return 1;
89 }
90 
91 static int proc_tcp_congestion_control(ctl_table *ctl, int write, struct file * filp,
92 				       void __user *buffer, size_t *lenp, loff_t *ppos)
93 {
94 	char val[TCP_CA_NAME_MAX];
95 	ctl_table tbl = {
96 		.data = val,
97 		.maxlen = TCP_CA_NAME_MAX,
98 	};
99 	int ret;
100 
101 	tcp_get_default_congestion_control(val);
102 
103 	ret = proc_dostring(&tbl, write, filp, buffer, lenp, ppos);
104 	if (write && ret == 0)
105 		ret = tcp_set_default_congestion_control(val);
106 	return ret;
107 }
108 
109 static int sysctl_tcp_congestion_control(ctl_table *table, int __user *name,
110 					 int nlen, void __user *oldval,
111 					 size_t __user *oldlenp,
112 					 void __user *newval, size_t newlen,
113 					 void **context)
114 {
115 	char val[TCP_CA_NAME_MAX];
116 	ctl_table tbl = {
117 		.data = val,
118 		.maxlen = TCP_CA_NAME_MAX,
119 	};
120 	int ret;
121 
122 	tcp_get_default_congestion_control(val);
123 	ret = sysctl_string(&tbl, name, nlen, oldval, oldlenp, newval, newlen,
124 			    context);
125 	if (ret == 0 && newval && newlen)
126 		ret = tcp_set_default_congestion_control(val);
127 	return ret;
128 }
129 
130 
131 ctl_table ipv4_table[] = {
132         {
133 		.ctl_name	= NET_IPV4_TCP_TIMESTAMPS,
134 		.procname	= "tcp_timestamps",
135 		.data		= &sysctl_tcp_timestamps,
136 		.maxlen		= sizeof(int),
137 		.mode		= 0644,
138 		.proc_handler	= &proc_dointvec
139 	},
140         {
141 		.ctl_name	= NET_IPV4_TCP_WINDOW_SCALING,
142 		.procname	= "tcp_window_scaling",
143 		.data		= &sysctl_tcp_window_scaling,
144 		.maxlen		= sizeof(int),
145 		.mode		= 0644,
146 		.proc_handler	= &proc_dointvec
147 	},
148         {
149 		.ctl_name	= NET_IPV4_TCP_SACK,
150 		.procname	= "tcp_sack",
151 		.data		= &sysctl_tcp_sack,
152 		.maxlen		= sizeof(int),
153 		.mode		= 0644,
154 		.proc_handler	= &proc_dointvec
155 	},
156         {
157 		.ctl_name	= NET_IPV4_TCP_RETRANS_COLLAPSE,
158 		.procname	= "tcp_retrans_collapse",
159 		.data		= &sysctl_tcp_retrans_collapse,
160 		.maxlen		= sizeof(int),
161 		.mode		= 0644,
162 		.proc_handler	= &proc_dointvec
163 	},
164         {
165 		.ctl_name	= NET_IPV4_FORWARD,
166 		.procname	= "ip_forward",
167 		.data		= &ipv4_devconf.forwarding,
168 		.maxlen		= sizeof(int),
169 		.mode		= 0644,
170 		.proc_handler	= &ipv4_sysctl_forward,
171 		.strategy	= &ipv4_sysctl_forward_strategy
172 	},
173         {
174 		.ctl_name	= NET_IPV4_DEFAULT_TTL,
175 		.procname	= "ip_default_ttl",
176  		.data		= &sysctl_ip_default_ttl,
177 		.maxlen		= sizeof(int),
178 		.mode		= 0644,
179 		.proc_handler	= &ipv4_doint_and_flush,
180 		.strategy	= &ipv4_doint_and_flush_strategy,
181 	},
182         {
183 		.ctl_name	= NET_IPV4_AUTOCONFIG,
184 		.procname	= "ip_autoconfig",
185 		.data		= &ipv4_config.autoconfig,
186 		.maxlen		= sizeof(int),
187 		.mode		= 0644,
188 		.proc_handler	= &proc_dointvec
189 	},
190         {
191 		.ctl_name	= NET_IPV4_NO_PMTU_DISC,
192 		.procname	= "ip_no_pmtu_disc",
193 		.data		= &ipv4_config.no_pmtu_disc,
194 		.maxlen		= sizeof(int),
195 		.mode		= 0644,
196 		.proc_handler	= &proc_dointvec
197 	},
198 	{
199 		.ctl_name	= NET_IPV4_NONLOCAL_BIND,
200 		.procname	= "ip_nonlocal_bind",
201 		.data		= &sysctl_ip_nonlocal_bind,
202 		.maxlen		= sizeof(int),
203 		.mode		= 0644,
204 		.proc_handler	= &proc_dointvec
205 	},
206 	{
207 		.ctl_name	= NET_IPV4_TCP_SYN_RETRIES,
208 		.procname	= "tcp_syn_retries",
209 		.data		= &sysctl_tcp_syn_retries,
210 		.maxlen		= sizeof(int),
211 		.mode		= 0644,
212 		.proc_handler	= &proc_dointvec
213 	},
214 	{
215 		.ctl_name	= NET_TCP_SYNACK_RETRIES,
216 		.procname	= "tcp_synack_retries",
217 		.data		= &sysctl_tcp_synack_retries,
218 		.maxlen		= sizeof(int),
219 		.mode		= 0644,
220 		.proc_handler	= &proc_dointvec
221 	},
222 	{
223 		.ctl_name	= NET_TCP_MAX_ORPHANS,
224 		.procname	= "tcp_max_orphans",
225 		.data		= &sysctl_tcp_max_orphans,
226 		.maxlen		= sizeof(int),
227 		.mode		= 0644,
228 		.proc_handler	= &proc_dointvec
229 	},
230 	{
231 		.ctl_name	= NET_TCP_MAX_TW_BUCKETS,
232 		.procname	= "tcp_max_tw_buckets",
233 		.data		= &tcp_death_row.sysctl_max_tw_buckets,
234 		.maxlen		= sizeof(int),
235 		.mode		= 0644,
236 		.proc_handler	= &proc_dointvec
237 	},
238 	{
239 		.ctl_name	= NET_IPV4_IPFRAG_HIGH_THRESH,
240 		.procname	= "ipfrag_high_thresh",
241 		.data		= &sysctl_ipfrag_high_thresh,
242 		.maxlen		= sizeof(int),
243 		.mode		= 0644,
244 		.proc_handler	= &proc_dointvec
245 	},
246 	{
247 		.ctl_name	= NET_IPV4_IPFRAG_LOW_THRESH,
248 		.procname	= "ipfrag_low_thresh",
249 		.data		= &sysctl_ipfrag_low_thresh,
250 		.maxlen		= sizeof(int),
251 		.mode		= 0644,
252 		.proc_handler	= &proc_dointvec
253 	},
254 	{
255 		.ctl_name	= NET_IPV4_DYNADDR,
256 		.procname	= "ip_dynaddr",
257 		.data		= &sysctl_ip_dynaddr,
258 		.maxlen		= sizeof(int),
259 		.mode		= 0644,
260 		.proc_handler	= &proc_dointvec
261 	},
262 	{
263 		.ctl_name	= NET_IPV4_IPFRAG_TIME,
264 		.procname	= "ipfrag_time",
265 		.data		= &sysctl_ipfrag_time,
266 		.maxlen		= sizeof(int),
267 		.mode		= 0644,
268 		.proc_handler	= &proc_dointvec_jiffies,
269 		.strategy	= &sysctl_jiffies
270 	},
271 	{
272 		.ctl_name	= NET_IPV4_TCP_KEEPALIVE_TIME,
273 		.procname	= "tcp_keepalive_time",
274 		.data		= &sysctl_tcp_keepalive_time,
275 		.maxlen		= sizeof(int),
276 		.mode		= 0644,
277 		.proc_handler	= &proc_dointvec_jiffies,
278 		.strategy	= &sysctl_jiffies
279 	},
280 	{
281 		.ctl_name	= NET_IPV4_TCP_KEEPALIVE_PROBES,
282 		.procname	= "tcp_keepalive_probes",
283 		.data		= &sysctl_tcp_keepalive_probes,
284 		.maxlen		= sizeof(int),
285 		.mode		= 0644,
286 		.proc_handler	= &proc_dointvec
287 	},
288 	{
289 		.ctl_name	= NET_IPV4_TCP_KEEPALIVE_INTVL,
290 		.procname	= "tcp_keepalive_intvl",
291 		.data		= &sysctl_tcp_keepalive_intvl,
292 		.maxlen		= sizeof(int),
293 		.mode		= 0644,
294 		.proc_handler	= &proc_dointvec_jiffies,
295 		.strategy	= &sysctl_jiffies
296 	},
297 	{
298 		.ctl_name	= NET_IPV4_TCP_RETRIES1,
299 		.procname	= "tcp_retries1",
300 		.data		= &sysctl_tcp_retries1,
301 		.maxlen		= sizeof(int),
302 		.mode		= 0644,
303 		.proc_handler	= &proc_dointvec_minmax,
304 		.strategy	= &sysctl_intvec,
305 		.extra2		= &tcp_retr1_max
306 	},
307 	{
308 		.ctl_name	= NET_IPV4_TCP_RETRIES2,
309 		.procname	= "tcp_retries2",
310 		.data		= &sysctl_tcp_retries2,
311 		.maxlen		= sizeof(int),
312 		.mode		= 0644,
313 		.proc_handler	= &proc_dointvec
314 	},
315 	{
316 		.ctl_name	= NET_IPV4_TCP_FIN_TIMEOUT,
317 		.procname	= "tcp_fin_timeout",
318 		.data		= &sysctl_tcp_fin_timeout,
319 		.maxlen		= sizeof(int),
320 		.mode		= 0644,
321 		.proc_handler	= &proc_dointvec_jiffies,
322 		.strategy	= &sysctl_jiffies
323 	},
324 #ifdef CONFIG_SYN_COOKIES
325 	{
326 		.ctl_name	= NET_TCP_SYNCOOKIES,
327 		.procname	= "tcp_syncookies",
328 		.data		= &sysctl_tcp_syncookies,
329 		.maxlen		= sizeof(int),
330 		.mode		= 0644,
331 		.proc_handler	= &proc_dointvec
332 	},
333 #endif
334 	{
335 		.ctl_name	= NET_TCP_TW_RECYCLE,
336 		.procname	= "tcp_tw_recycle",
337 		.data		= &tcp_death_row.sysctl_tw_recycle,
338 		.maxlen		= sizeof(int),
339 		.mode		= 0644,
340 		.proc_handler	= &proc_dointvec
341 	},
342 	{
343 		.ctl_name	= NET_TCP_ABORT_ON_OVERFLOW,
344 		.procname	= "tcp_abort_on_overflow",
345 		.data		= &sysctl_tcp_abort_on_overflow,
346 		.maxlen		= sizeof(int),
347 		.mode		= 0644,
348 		.proc_handler	= &proc_dointvec
349 	},
350 	{
351 		.ctl_name	= NET_TCP_STDURG,
352 		.procname	= "tcp_stdurg",
353 		.data		= &sysctl_tcp_stdurg,
354 		.maxlen		= sizeof(int),
355 		.mode		= 0644,
356 		.proc_handler	= &proc_dointvec
357 	},
358 	{
359 		.ctl_name	= NET_TCP_RFC1337,
360 		.procname	= "tcp_rfc1337",
361 		.data		= &sysctl_tcp_rfc1337,
362 		.maxlen		= sizeof(int),
363 		.mode		= 0644,
364 		.proc_handler	= &proc_dointvec
365 	},
366 	{
367 		.ctl_name	= NET_TCP_MAX_SYN_BACKLOG,
368 		.procname	= "tcp_max_syn_backlog",
369 		.data		= &sysctl_max_syn_backlog,
370 		.maxlen		= sizeof(int),
371 		.mode		= 0644,
372 		.proc_handler	= &proc_dointvec
373 	},
374 	{
375 		.ctl_name	= NET_IPV4_LOCAL_PORT_RANGE,
376 		.procname	= "ip_local_port_range",
377 		.data		= &sysctl_local_port_range,
378 		.maxlen		= sizeof(sysctl_local_port_range),
379 		.mode		= 0644,
380 		.proc_handler	= &proc_dointvec_minmax,
381 		.strategy	= &sysctl_intvec,
382 		.extra1		= ip_local_port_range_min,
383 		.extra2		= ip_local_port_range_max
384 	},
385 	{
386 		.ctl_name	= NET_IPV4_ICMP_ECHO_IGNORE_ALL,
387 		.procname	= "icmp_echo_ignore_all",
388 		.data		= &sysctl_icmp_echo_ignore_all,
389 		.maxlen		= sizeof(int),
390 		.mode		= 0644,
391 		.proc_handler	= &proc_dointvec
392 	},
393 	{
394 		.ctl_name	= NET_IPV4_ICMP_ECHO_IGNORE_BROADCASTS,
395 		.procname	= "icmp_echo_ignore_broadcasts",
396 		.data		= &sysctl_icmp_echo_ignore_broadcasts,
397 		.maxlen		= sizeof(int),
398 		.mode		= 0644,
399 		.proc_handler	= &proc_dointvec
400 	},
401 	{
402 		.ctl_name	= NET_IPV4_ICMP_IGNORE_BOGUS_ERROR_RESPONSES,
403 		.procname	= "icmp_ignore_bogus_error_responses",
404 		.data		= &sysctl_icmp_ignore_bogus_error_responses,
405 		.maxlen		= sizeof(int),
406 		.mode		= 0644,
407 		.proc_handler	= &proc_dointvec
408 	},
409 	{
410 		.ctl_name	= NET_IPV4_ICMP_ERRORS_USE_INBOUND_IFADDR,
411 		.procname	= "icmp_errors_use_inbound_ifaddr",
412 		.data		= &sysctl_icmp_errors_use_inbound_ifaddr,
413 		.maxlen		= sizeof(int),
414 		.mode		= 0644,
415 		.proc_handler	= &proc_dointvec
416 	},
417 	{
418 		.ctl_name	= NET_IPV4_ROUTE,
419 		.procname	= "route",
420 		.maxlen		= 0,
421 		.mode		= 0555,
422 		.child		= ipv4_route_table
423 	},
424 #ifdef CONFIG_IP_MULTICAST
425 	{
426 		.ctl_name	= NET_IPV4_IGMP_MAX_MEMBERSHIPS,
427 		.procname	= "igmp_max_memberships",
428 		.data		= &sysctl_igmp_max_memberships,
429 		.maxlen		= sizeof(int),
430 		.mode		= 0644,
431 		.proc_handler	= &proc_dointvec
432 	},
433 
434 #endif
435 	{
436 		.ctl_name	= NET_IPV4_IGMP_MAX_MSF,
437 		.procname	= "igmp_max_msf",
438 		.data		= &sysctl_igmp_max_msf,
439 		.maxlen		= sizeof(int),
440 		.mode		= 0644,
441 		.proc_handler	= &proc_dointvec
442 	},
443 	{
444 		.ctl_name	= NET_IPV4_INET_PEER_THRESHOLD,
445 		.procname	= "inet_peer_threshold",
446 		.data		= &inet_peer_threshold,
447 		.maxlen		= sizeof(int),
448 		.mode		= 0644,
449 		.proc_handler	= &proc_dointvec
450 	},
451 	{
452 		.ctl_name	= NET_IPV4_INET_PEER_MINTTL,
453 		.procname	= "inet_peer_minttl",
454 		.data		= &inet_peer_minttl,
455 		.maxlen		= sizeof(int),
456 		.mode		= 0644,
457 		.proc_handler	= &proc_dointvec_jiffies,
458 		.strategy	= &sysctl_jiffies
459 	},
460 	{
461 		.ctl_name	= NET_IPV4_INET_PEER_MAXTTL,
462 		.procname	= "inet_peer_maxttl",
463 		.data		= &inet_peer_maxttl,
464 		.maxlen		= sizeof(int),
465 		.mode		= 0644,
466 		.proc_handler	= &proc_dointvec_jiffies,
467 		.strategy	= &sysctl_jiffies
468 	},
469 	{
470 		.ctl_name	= NET_IPV4_INET_PEER_GC_MINTIME,
471 		.procname	= "inet_peer_gc_mintime",
472 		.data		= &inet_peer_gc_mintime,
473 		.maxlen		= sizeof(int),
474 		.mode		= 0644,
475 		.proc_handler	= &proc_dointvec_jiffies,
476 		.strategy	= &sysctl_jiffies
477 	},
478 	{
479 		.ctl_name	= NET_IPV4_INET_PEER_GC_MAXTIME,
480 		.procname	= "inet_peer_gc_maxtime",
481 		.data		= &inet_peer_gc_maxtime,
482 		.maxlen		= sizeof(int),
483 		.mode		= 0644,
484 		.proc_handler	= &proc_dointvec_jiffies,
485 		.strategy	= &sysctl_jiffies
486 	},
487 	{
488 		.ctl_name	= NET_TCP_ORPHAN_RETRIES,
489 		.procname	= "tcp_orphan_retries",
490 		.data		= &sysctl_tcp_orphan_retries,
491 		.maxlen		= sizeof(int),
492 		.mode		= 0644,
493 		.proc_handler	= &proc_dointvec
494 	},
495 	{
496 		.ctl_name	= NET_TCP_FACK,
497 		.procname	= "tcp_fack",
498 		.data		= &sysctl_tcp_fack,
499 		.maxlen		= sizeof(int),
500 		.mode		= 0644,
501 		.proc_handler	= &proc_dointvec
502 	},
503 	{
504 		.ctl_name	= NET_TCP_REORDERING,
505 		.procname	= "tcp_reordering",
506 		.data		= &sysctl_tcp_reordering,
507 		.maxlen		= sizeof(int),
508 		.mode		= 0644,
509 		.proc_handler	= &proc_dointvec
510 	},
511 	{
512 		.ctl_name	= NET_TCP_ECN,
513 		.procname	= "tcp_ecn",
514 		.data		= &sysctl_tcp_ecn,
515 		.maxlen		= sizeof(int),
516 		.mode		= 0644,
517 		.proc_handler	= &proc_dointvec
518 	},
519 	{
520 		.ctl_name	= NET_TCP_DSACK,
521 		.procname	= "tcp_dsack",
522 		.data		= &sysctl_tcp_dsack,
523 		.maxlen		= sizeof(int),
524 		.mode		= 0644,
525 		.proc_handler	= &proc_dointvec
526 	},
527 	{
528 		.ctl_name	= NET_TCP_MEM,
529 		.procname	= "tcp_mem",
530 		.data		= &sysctl_tcp_mem,
531 		.maxlen		= sizeof(sysctl_tcp_mem),
532 		.mode		= 0644,
533 		.proc_handler	= &proc_dointvec
534 	},
535 	{
536 		.ctl_name	= NET_TCP_WMEM,
537 		.procname	= "tcp_wmem",
538 		.data		= &sysctl_tcp_wmem,
539 		.maxlen		= sizeof(sysctl_tcp_wmem),
540 		.mode		= 0644,
541 		.proc_handler	= &proc_dointvec
542 	},
543 	{
544 		.ctl_name	= NET_TCP_RMEM,
545 		.procname	= "tcp_rmem",
546 		.data		= &sysctl_tcp_rmem,
547 		.maxlen		= sizeof(sysctl_tcp_rmem),
548 		.mode		= 0644,
549 		.proc_handler	= &proc_dointvec
550 	},
551 	{
552 		.ctl_name	= NET_TCP_APP_WIN,
553 		.procname	= "tcp_app_win",
554 		.data		= &sysctl_tcp_app_win,
555 		.maxlen		= sizeof(int),
556 		.mode		= 0644,
557 		.proc_handler	= &proc_dointvec
558 	},
559 	{
560 		.ctl_name	= NET_TCP_ADV_WIN_SCALE,
561 		.procname	= "tcp_adv_win_scale",
562 		.data		= &sysctl_tcp_adv_win_scale,
563 		.maxlen		= sizeof(int),
564 		.mode		= 0644,
565 		.proc_handler	= &proc_dointvec
566 	},
567 	{
568 		.ctl_name	= NET_IPV4_ICMP_RATELIMIT,
569 		.procname	= "icmp_ratelimit",
570 		.data		= &sysctl_icmp_ratelimit,
571 		.maxlen		= sizeof(int),
572 		.mode		= 0644,
573 		.proc_handler	= &proc_dointvec
574 	},
575 	{
576 		.ctl_name	= NET_IPV4_ICMP_RATEMASK,
577 		.procname	= "icmp_ratemask",
578 		.data		= &sysctl_icmp_ratemask,
579 		.maxlen		= sizeof(int),
580 		.mode		= 0644,
581 		.proc_handler	= &proc_dointvec
582 	},
583 	{
584 		.ctl_name	= NET_TCP_TW_REUSE,
585 		.procname	= "tcp_tw_reuse",
586 		.data		= &sysctl_tcp_tw_reuse,
587 		.maxlen		= sizeof(int),
588 		.mode		= 0644,
589 		.proc_handler	= &proc_dointvec
590 	},
591 	{
592 		.ctl_name	= NET_TCP_FRTO,
593 		.procname	= "tcp_frto",
594 		.data		= &sysctl_tcp_frto,
595 		.maxlen		= sizeof(int),
596 		.mode		= 0644,
597 		.proc_handler	= &proc_dointvec
598 	},
599 	{
600 		.ctl_name	= NET_TCP_LOW_LATENCY,
601 		.procname	= "tcp_low_latency",
602 		.data		= &sysctl_tcp_low_latency,
603 		.maxlen		= sizeof(int),
604 		.mode		= 0644,
605 		.proc_handler	= &proc_dointvec
606 	},
607 	{
608 		.ctl_name	= NET_IPV4_IPFRAG_SECRET_INTERVAL,
609 		.procname	= "ipfrag_secret_interval",
610 		.data		= &sysctl_ipfrag_secret_interval,
611 		.maxlen		= sizeof(int),
612 		.mode		= 0644,
613 		.proc_handler	= &proc_dointvec_jiffies,
614 		.strategy	= &sysctl_jiffies
615 	},
616 	{
617 		.ctl_name	= NET_TCP_NO_METRICS_SAVE,
618 		.procname	= "tcp_no_metrics_save",
619 		.data		= &sysctl_tcp_nometrics_save,
620 		.maxlen		= sizeof(int),
621 		.mode		= 0644,
622 		.proc_handler	= &proc_dointvec,
623 	},
624 	{
625 		.ctl_name	= NET_TCP_MODERATE_RCVBUF,
626 		.procname	= "tcp_moderate_rcvbuf",
627 		.data		= &sysctl_tcp_moderate_rcvbuf,
628 		.maxlen		= sizeof(int),
629 		.mode		= 0644,
630 		.proc_handler	= &proc_dointvec,
631 	},
632 	{
633 		.ctl_name	= NET_TCP_TSO_WIN_DIVISOR,
634 		.procname	= "tcp_tso_win_divisor",
635 		.data		= &sysctl_tcp_tso_win_divisor,
636 		.maxlen		= sizeof(int),
637 		.mode		= 0644,
638 		.proc_handler	= &proc_dointvec,
639 	},
640 	{
641 		.ctl_name	= NET_TCP_CONG_CONTROL,
642 		.procname	= "tcp_congestion_control",
643 		.mode		= 0644,
644 		.maxlen		= TCP_CA_NAME_MAX,
645 		.proc_handler	= &proc_tcp_congestion_control,
646 		.strategy	= &sysctl_tcp_congestion_control,
647 	},
648 	{
649 		.ctl_name	= NET_TCP_ABC,
650 		.procname	= "tcp_abc",
651 		.data		= &sysctl_tcp_abc,
652 		.maxlen		= sizeof(int),
653 		.mode		= 0644,
654 		.proc_handler	= &proc_dointvec,
655 	},
656 
657 	{ .ctl_name = 0 }
658 };
659 
660 #endif /* CONFIG_SYSCTL */
661 
662 EXPORT_SYMBOL(ipv4_config);
663