sysctl_net_ipv4.c revision 89cee8b1cbb9dac40c92ef1968aea2b45f82fd18 
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 */
22extern int sysctl_ip_nonlocal_bind;
23
24#ifdef CONFIG_SYSCTL
25static int zero;
26static int tcp_retr1_max = 255;
27static int ip_local_port_range_min[] = { 1, 1 };
28static int ip_local_port_range_max[] = { 65535, 65535 };
29#endif
30
31struct ipv4_config ipv4_config;
32
33#ifdef CONFIG_SYSCTL
34
35static
36int ipv4_sysctl_forward(ctl_table *ctl, int write, struct file * filp,
37			void __user *buffer, size_t *lenp, loff_t *ppos)
38{
39	int val = ipv4_devconf.forwarding;
40	int ret;
41
42	ret = proc_dointvec(ctl, write, filp, buffer, lenp, ppos);
43
44	if (write && ipv4_devconf.forwarding != val)
45		inet_forward_change();
46
47	return ret;
48}
49
50static int ipv4_sysctl_forward_strategy(ctl_table *table,
51			 int __user *name, int nlen,
52			 void __user *oldval, size_t __user *oldlenp,
53			 void __user *newval, size_t newlen,
54			 void **context)
55{
56	int *valp = table->data;
57	int new;
58
59	if (!newval || !newlen)
60		return 0;
61
62	if (newlen != sizeof(int))
63		return -EINVAL;
64
65	if (get_user(new, (int __user *)newval))
66		return -EFAULT;
67
68	if (new == *valp)
69		return 0;
70
71	if (oldval && oldlenp) {
72		size_t len;
73
74		if (get_user(len, oldlenp))
75			return -EFAULT;
76
77		if (len) {
78			if (len > table->maxlen)
79				len = table->maxlen;
80			if (copy_to_user(oldval, valp, len))
81				return -EFAULT;
82			if (put_user(len, oldlenp))
83				return -EFAULT;
84		}
85	}
86
87	*valp = new;
88	inet_forward_change();
89	return 1;
90}
91
92static int proc_tcp_congestion_control(ctl_table *ctl, int write, struct file * filp,
93				       void __user *buffer, size_t *lenp, loff_t *ppos)
94{
95	char val[TCP_CA_NAME_MAX];
96	ctl_table tbl = {
97		.data = val,
98		.maxlen = TCP_CA_NAME_MAX,
99	};
100	int ret;
101
102	tcp_get_default_congestion_control(val);
103
104	ret = proc_dostring(&tbl, write, filp, buffer, lenp, ppos);
105	if (write && ret == 0)
106		ret = tcp_set_default_congestion_control(val);
107	return ret;
108}
109
110static int sysctl_tcp_congestion_control(ctl_table *table, int __user *name,
111					 int nlen, void __user *oldval,
112					 size_t __user *oldlenp,
113					 void __user *newval, size_t newlen,
114					 void **context)
115{
116	char val[TCP_CA_NAME_MAX];
117	ctl_table tbl = {
118		.data = val,
119		.maxlen = TCP_CA_NAME_MAX,
120	};
121	int ret;
122
123	tcp_get_default_congestion_control(val);
124	ret = sysctl_string(&tbl, name, nlen, oldval, oldlenp, newval, newlen,
125			    context);
126	if (ret == 0 && newval && newlen)
127		ret = tcp_set_default_congestion_control(val);
128	return ret;
129}
130
131
132ctl_table ipv4_table[] = {
133        {
134		.ctl_name	= NET_IPV4_TCP_TIMESTAMPS,
135		.procname	= "tcp_timestamps",
136		.data		= &sysctl_tcp_timestamps,
137		.maxlen		= sizeof(int),
138		.mode		= 0644,
139		.proc_handler	= &proc_dointvec
140	},
141        {
142		.ctl_name	= NET_IPV4_TCP_WINDOW_SCALING,
143		.procname	= "tcp_window_scaling",
144		.data		= &sysctl_tcp_window_scaling,
145		.maxlen		= sizeof(int),
146		.mode		= 0644,
147		.proc_handler	= &proc_dointvec
148	},
149        {
150		.ctl_name	= NET_IPV4_TCP_SACK,
151		.procname	= "tcp_sack",
152		.data		= &sysctl_tcp_sack,
153		.maxlen		= sizeof(int),
154		.mode		= 0644,
155		.proc_handler	= &proc_dointvec
156	},
157        {
158		.ctl_name	= NET_IPV4_TCP_RETRANS_COLLAPSE,
159		.procname	= "tcp_retrans_collapse",
160		.data		= &sysctl_tcp_retrans_collapse,
161		.maxlen		= sizeof(int),
162		.mode		= 0644,
163		.proc_handler	= &proc_dointvec
164	},
165        {
166		.ctl_name	= NET_IPV4_FORWARD,
167		.procname	= "ip_forward",
168		.data		= &ipv4_devconf.forwarding,
169		.maxlen		= sizeof(int),
170		.mode		= 0644,
171		.proc_handler	= &ipv4_sysctl_forward,
172		.strategy	= &ipv4_sysctl_forward_strategy
173	},
174        {
175		.ctl_name	= NET_IPV4_DEFAULT_TTL,
176		.procname	= "ip_default_ttl",
177 		.data		= &sysctl_ip_default_ttl,
178		.maxlen		= sizeof(int),
179		.mode		= 0644,
180		.proc_handler	= &ipv4_doint_and_flush,
181		.strategy	= &ipv4_doint_and_flush_strategy,
182	},
183        {
184		.ctl_name	= NET_IPV4_AUTOCONFIG,
185		.procname	= "ip_autoconfig",
186		.data		= &ipv4_config.autoconfig,
187		.maxlen		= sizeof(int),
188		.mode		= 0644,
189		.proc_handler	= &proc_dointvec
190	},
191        {
192		.ctl_name	= NET_IPV4_NO_PMTU_DISC,
193		.procname	= "ip_no_pmtu_disc",
194		.data		= &ipv4_config.no_pmtu_disc,
195		.maxlen		= sizeof(int),
196		.mode		= 0644,
197		.proc_handler	= &proc_dointvec
198	},
199	{
200		.ctl_name	= NET_IPV4_NONLOCAL_BIND,
201		.procname	= "ip_nonlocal_bind",
202		.data		= &sysctl_ip_nonlocal_bind,
203		.maxlen		= sizeof(int),
204		.mode		= 0644,
205		.proc_handler	= &proc_dointvec
206	},
207	{
208		.ctl_name	= NET_IPV4_TCP_SYN_RETRIES,
209		.procname	= "tcp_syn_retries",
210		.data		= &sysctl_tcp_syn_retries,
211		.maxlen		= sizeof(int),
212		.mode		= 0644,
213		.proc_handler	= &proc_dointvec
214	},
215	{
216		.ctl_name	= NET_TCP_SYNACK_RETRIES,
217		.procname	= "tcp_synack_retries",
218		.data		= &sysctl_tcp_synack_retries,
219		.maxlen		= sizeof(int),
220		.mode		= 0644,
221		.proc_handler	= &proc_dointvec
222	},
223	{
224		.ctl_name	= NET_TCP_MAX_ORPHANS,
225		.procname	= "tcp_max_orphans",
226		.data		= &sysctl_tcp_max_orphans,
227		.maxlen		= sizeof(int),
228		.mode		= 0644,
229		.proc_handler	= &proc_dointvec
230	},
231	{
232		.ctl_name	= NET_TCP_MAX_TW_BUCKETS,
233		.procname	= "tcp_max_tw_buckets",
234		.data		= &tcp_death_row.sysctl_max_tw_buckets,
235		.maxlen		= sizeof(int),
236		.mode		= 0644,
237		.proc_handler	= &proc_dointvec
238	},
239	{
240		.ctl_name	= NET_IPV4_IPFRAG_HIGH_THRESH,
241		.procname	= "ipfrag_high_thresh",
242		.data		= &sysctl_ipfrag_high_thresh,
243		.maxlen		= sizeof(int),
244		.mode		= 0644,
245		.proc_handler	= &proc_dointvec
246	},
247	{
248		.ctl_name	= NET_IPV4_IPFRAG_LOW_THRESH,
249		.procname	= "ipfrag_low_thresh",
250		.data		= &sysctl_ipfrag_low_thresh,
251		.maxlen		= sizeof(int),
252		.mode		= 0644,
253		.proc_handler	= &proc_dointvec
254	},
255	{
256		.ctl_name	= NET_IPV4_DYNADDR,
257		.procname	= "ip_dynaddr",
258		.data		= &sysctl_ip_dynaddr,
259		.maxlen		= sizeof(int),
260		.mode		= 0644,
261		.proc_handler	= &proc_dointvec
262	},
263	{
264		.ctl_name	= NET_IPV4_IPFRAG_TIME,
265		.procname	= "ipfrag_time",
266		.data		= &sysctl_ipfrag_time,
267		.maxlen		= sizeof(int),
268		.mode		= 0644,
269		.proc_handler	= &proc_dointvec_jiffies,
270		.strategy	= &sysctl_jiffies
271	},
272	{
273		.ctl_name	= NET_IPV4_TCP_KEEPALIVE_TIME,
274		.procname	= "tcp_keepalive_time",
275		.data		= &sysctl_tcp_keepalive_time,
276		.maxlen		= sizeof(int),
277		.mode		= 0644,
278		.proc_handler	= &proc_dointvec_jiffies,
279		.strategy	= &sysctl_jiffies
280	},
281	{
282		.ctl_name	= NET_IPV4_TCP_KEEPALIVE_PROBES,
283		.procname	= "tcp_keepalive_probes",
284		.data		= &sysctl_tcp_keepalive_probes,
285		.maxlen		= sizeof(int),
286		.mode		= 0644,
287		.proc_handler	= &proc_dointvec
288	},
289	{
290		.ctl_name	= NET_IPV4_TCP_KEEPALIVE_INTVL,
291		.procname	= "tcp_keepalive_intvl",
292		.data		= &sysctl_tcp_keepalive_intvl,
293		.maxlen		= sizeof(int),
294		.mode		= 0644,
295		.proc_handler	= &proc_dointvec_jiffies,
296		.strategy	= &sysctl_jiffies
297	},
298	{
299		.ctl_name	= NET_IPV4_TCP_RETRIES1,
300		.procname	= "tcp_retries1",
301		.data		= &sysctl_tcp_retries1,
302		.maxlen		= sizeof(int),
303		.mode		= 0644,
304		.proc_handler	= &proc_dointvec_minmax,
305		.strategy	= &sysctl_intvec,
306		.extra2		= &tcp_retr1_max
307	},
308	{
309		.ctl_name	= NET_IPV4_TCP_RETRIES2,
310		.procname	= "tcp_retries2",
311		.data		= &sysctl_tcp_retries2,
312		.maxlen		= sizeof(int),
313		.mode		= 0644,
314		.proc_handler	= &proc_dointvec
315	},
316	{
317		.ctl_name	= NET_IPV4_TCP_FIN_TIMEOUT,
318		.procname	= "tcp_fin_timeout",
319		.data		= &sysctl_tcp_fin_timeout,
320		.maxlen		= sizeof(int),
321		.mode		= 0644,
322		.proc_handler	= &proc_dointvec_jiffies,
323		.strategy	= &sysctl_jiffies
324	},
325#ifdef CONFIG_SYN_COOKIES
326	{
327		.ctl_name	= NET_TCP_SYNCOOKIES,
328		.procname	= "tcp_syncookies",
329		.data		= &sysctl_tcp_syncookies,
330		.maxlen		= sizeof(int),
331		.mode		= 0644,
332		.proc_handler	= &proc_dointvec
333	},
334#endif
335	{
336		.ctl_name	= NET_TCP_TW_RECYCLE,
337		.procname	= "tcp_tw_recycle",
338		.data		= &tcp_death_row.sysctl_tw_recycle,
339		.maxlen		= sizeof(int),
340		.mode		= 0644,
341		.proc_handler	= &proc_dointvec
342	},
343	{
344		.ctl_name	= NET_TCP_ABORT_ON_OVERFLOW,
345		.procname	= "tcp_abort_on_overflow",
346		.data		= &sysctl_tcp_abort_on_overflow,
347		.maxlen		= sizeof(int),
348		.mode		= 0644,
349		.proc_handler	= &proc_dointvec
350	},
351	{
352		.ctl_name	= NET_TCP_STDURG,
353		.procname	= "tcp_stdurg",
354		.data		= &sysctl_tcp_stdurg,
355		.maxlen		= sizeof(int),
356		.mode		= 0644,
357		.proc_handler	= &proc_dointvec
358	},
359	{
360		.ctl_name	= NET_TCP_RFC1337,
361		.procname	= "tcp_rfc1337",
362		.data		= &sysctl_tcp_rfc1337,
363		.maxlen		= sizeof(int),
364		.mode		= 0644,
365		.proc_handler	= &proc_dointvec
366	},
367	{
368		.ctl_name	= NET_TCP_MAX_SYN_BACKLOG,
369		.procname	= "tcp_max_syn_backlog",
370		.data		= &sysctl_max_syn_backlog,
371		.maxlen		= sizeof(int),
372		.mode		= 0644,
373		.proc_handler	= &proc_dointvec
374	},
375	{
376		.ctl_name	= NET_IPV4_LOCAL_PORT_RANGE,
377		.procname	= "ip_local_port_range",
378		.data		= &sysctl_local_port_range,
379		.maxlen		= sizeof(sysctl_local_port_range),
380		.mode		= 0644,
381		.proc_handler	= &proc_dointvec_minmax,
382		.strategy	= &sysctl_intvec,
383		.extra1		= ip_local_port_range_min,
384		.extra2		= ip_local_port_range_max
385	},
386	{
387		.ctl_name	= NET_IPV4_ICMP_ECHO_IGNORE_ALL,
388		.procname	= "icmp_echo_ignore_all",
389		.data		= &sysctl_icmp_echo_ignore_all,
390		.maxlen		= sizeof(int),
391		.mode		= 0644,
392		.proc_handler	= &proc_dointvec
393	},
394	{
395		.ctl_name	= NET_IPV4_ICMP_ECHO_IGNORE_BROADCASTS,
396		.procname	= "icmp_echo_ignore_broadcasts",
397		.data		= &sysctl_icmp_echo_ignore_broadcasts,
398		.maxlen		= sizeof(int),
399		.mode		= 0644,
400		.proc_handler	= &proc_dointvec
401	},
402	{
403		.ctl_name	= NET_IPV4_ICMP_IGNORE_BOGUS_ERROR_RESPONSES,
404		.procname	= "icmp_ignore_bogus_error_responses",
405		.data		= &sysctl_icmp_ignore_bogus_error_responses,
406		.maxlen		= sizeof(int),
407		.mode		= 0644,
408		.proc_handler	= &proc_dointvec
409	},
410	{
411		.ctl_name	= NET_IPV4_ICMP_ERRORS_USE_INBOUND_IFADDR,
412		.procname	= "icmp_errors_use_inbound_ifaddr",
413		.data		= &sysctl_icmp_errors_use_inbound_ifaddr,
414		.maxlen		= sizeof(int),
415		.mode		= 0644,
416		.proc_handler	= &proc_dointvec
417	},
418	{
419		.ctl_name	= NET_IPV4_ROUTE,
420		.procname	= "route",
421		.maxlen		= 0,
422		.mode		= 0555,
423		.child		= ipv4_route_table
424	},
425#ifdef CONFIG_IP_MULTICAST
426	{
427		.ctl_name	= NET_IPV4_IGMP_MAX_MEMBERSHIPS,
428		.procname	= "igmp_max_memberships",
429		.data		= &sysctl_igmp_max_memberships,
430		.maxlen		= sizeof(int),
431		.mode		= 0644,
432		.proc_handler	= &proc_dointvec
433	},
434
435#endif
436	{
437		.ctl_name	= NET_IPV4_IGMP_MAX_MSF,
438		.procname	= "igmp_max_msf",
439		.data		= &sysctl_igmp_max_msf,
440		.maxlen		= sizeof(int),
441		.mode		= 0644,
442		.proc_handler	= &proc_dointvec
443	},
444	{
445		.ctl_name	= NET_IPV4_INET_PEER_THRESHOLD,
446		.procname	= "inet_peer_threshold",
447		.data		= &inet_peer_threshold,
448		.maxlen		= sizeof(int),
449		.mode		= 0644,
450		.proc_handler	= &proc_dointvec
451	},
452	{
453		.ctl_name	= NET_IPV4_INET_PEER_MINTTL,
454		.procname	= "inet_peer_minttl",
455		.data		= &inet_peer_minttl,
456		.maxlen		= sizeof(int),
457		.mode		= 0644,
458		.proc_handler	= &proc_dointvec_jiffies,
459		.strategy	= &sysctl_jiffies
460	},
461	{
462		.ctl_name	= NET_IPV4_INET_PEER_MAXTTL,
463		.procname	= "inet_peer_maxttl",
464		.data		= &inet_peer_maxttl,
465		.maxlen		= sizeof(int),
466		.mode		= 0644,
467		.proc_handler	= &proc_dointvec_jiffies,
468		.strategy	= &sysctl_jiffies
469	},
470	{
471		.ctl_name	= NET_IPV4_INET_PEER_GC_MINTIME,
472		.procname	= "inet_peer_gc_mintime",
473		.data		= &inet_peer_gc_mintime,
474		.maxlen		= sizeof(int),
475		.mode		= 0644,
476		.proc_handler	= &proc_dointvec_jiffies,
477		.strategy	= &sysctl_jiffies
478	},
479	{
480		.ctl_name	= NET_IPV4_INET_PEER_GC_MAXTIME,
481		.procname	= "inet_peer_gc_maxtime",
482		.data		= &inet_peer_gc_maxtime,
483		.maxlen		= sizeof(int),
484		.mode		= 0644,
485		.proc_handler	= &proc_dointvec_jiffies,
486		.strategy	= &sysctl_jiffies
487	},
488	{
489		.ctl_name	= NET_TCP_ORPHAN_RETRIES,
490		.procname	= "tcp_orphan_retries",
491		.data		= &sysctl_tcp_orphan_retries,
492		.maxlen		= sizeof(int),
493		.mode		= 0644,
494		.proc_handler	= &proc_dointvec
495	},
496	{
497		.ctl_name	= NET_TCP_FACK,
498		.procname	= "tcp_fack",
499		.data		= &sysctl_tcp_fack,
500		.maxlen		= sizeof(int),
501		.mode		= 0644,
502		.proc_handler	= &proc_dointvec
503	},
504	{
505		.ctl_name	= NET_TCP_REORDERING,
506		.procname	= "tcp_reordering",
507		.data		= &sysctl_tcp_reordering,
508		.maxlen		= sizeof(int),
509		.mode		= 0644,
510		.proc_handler	= &proc_dointvec
511	},
512	{
513		.ctl_name	= NET_TCP_ECN,
514		.procname	= "tcp_ecn",
515		.data		= &sysctl_tcp_ecn,
516		.maxlen		= sizeof(int),
517		.mode		= 0644,
518		.proc_handler	= &proc_dointvec
519	},
520	{
521		.ctl_name	= NET_TCP_DSACK,
522		.procname	= "tcp_dsack",
523		.data		= &sysctl_tcp_dsack,
524		.maxlen		= sizeof(int),
525		.mode		= 0644,
526		.proc_handler	= &proc_dointvec
527	},
528	{
529		.ctl_name	= NET_TCP_MEM,
530		.procname	= "tcp_mem",
531		.data		= &sysctl_tcp_mem,
532		.maxlen		= sizeof(sysctl_tcp_mem),
533		.mode		= 0644,
534		.proc_handler	= &proc_dointvec
535	},
536	{
537		.ctl_name	= NET_TCP_WMEM,
538		.procname	= "tcp_wmem",
539		.data		= &sysctl_tcp_wmem,
540		.maxlen		= sizeof(sysctl_tcp_wmem),
541		.mode		= 0644,
542		.proc_handler	= &proc_dointvec
543	},
544	{
545		.ctl_name	= NET_TCP_RMEM,
546		.procname	= "tcp_rmem",
547		.data		= &sysctl_tcp_rmem,
548		.maxlen		= sizeof(sysctl_tcp_rmem),
549		.mode		= 0644,
550		.proc_handler	= &proc_dointvec
551	},
552	{
553		.ctl_name	= NET_TCP_APP_WIN,
554		.procname	= "tcp_app_win",
555		.data		= &sysctl_tcp_app_win,
556		.maxlen		= sizeof(int),
557		.mode		= 0644,
558		.proc_handler	= &proc_dointvec
559	},
560	{
561		.ctl_name	= NET_TCP_ADV_WIN_SCALE,
562		.procname	= "tcp_adv_win_scale",
563		.data		= &sysctl_tcp_adv_win_scale,
564		.maxlen		= sizeof(int),
565		.mode		= 0644,
566		.proc_handler	= &proc_dointvec
567	},
568	{
569		.ctl_name	= NET_IPV4_ICMP_RATELIMIT,
570		.procname	= "icmp_ratelimit",
571		.data		= &sysctl_icmp_ratelimit,
572		.maxlen		= sizeof(int),
573		.mode		= 0644,
574		.proc_handler	= &proc_dointvec
575	},
576	{
577		.ctl_name	= NET_IPV4_ICMP_RATEMASK,
578		.procname	= "icmp_ratemask",
579		.data		= &sysctl_icmp_ratemask,
580		.maxlen		= sizeof(int),
581		.mode		= 0644,
582		.proc_handler	= &proc_dointvec
583	},
584	{
585		.ctl_name	= NET_TCP_TW_REUSE,
586		.procname	= "tcp_tw_reuse",
587		.data		= &sysctl_tcp_tw_reuse,
588		.maxlen		= sizeof(int),
589		.mode		= 0644,
590		.proc_handler	= &proc_dointvec
591	},
592	{
593		.ctl_name	= NET_TCP_FRTO,
594		.procname	= "tcp_frto",
595		.data		= &sysctl_tcp_frto,
596		.maxlen		= sizeof(int),
597		.mode		= 0644,
598		.proc_handler	= &proc_dointvec
599	},
600	{
601		.ctl_name	= NET_TCP_LOW_LATENCY,
602		.procname	= "tcp_low_latency",
603		.data		= &sysctl_tcp_low_latency,
604		.maxlen		= sizeof(int),
605		.mode		= 0644,
606		.proc_handler	= &proc_dointvec
607	},
608	{
609		.ctl_name	= NET_IPV4_IPFRAG_SECRET_INTERVAL,
610		.procname	= "ipfrag_secret_interval",
611		.data		= &sysctl_ipfrag_secret_interval,
612		.maxlen		= sizeof(int),
613		.mode		= 0644,
614		.proc_handler	= &proc_dointvec_jiffies,
615		.strategy	= &sysctl_jiffies
616	},
617	{
618		.ctl_name	= NET_IPV4_IPFRAG_MAX_DIST,
619		.procname	= "ipfrag_max_dist",
620		.data		= &sysctl_ipfrag_max_dist,
621		.maxlen		= sizeof(int),
622		.mode		= 0644,
623		.proc_handler	= &proc_dointvec_minmax,
624		.extra1		= &zero
625	},
626	{
627		.ctl_name	= NET_TCP_NO_METRICS_SAVE,
628		.procname	= "tcp_no_metrics_save",
629		.data		= &sysctl_tcp_nometrics_save,
630		.maxlen		= sizeof(int),
631		.mode		= 0644,
632		.proc_handler	= &proc_dointvec,
633	},
634	{
635		.ctl_name	= NET_TCP_MODERATE_RCVBUF,
636		.procname	= "tcp_moderate_rcvbuf",
637		.data		= &sysctl_tcp_moderate_rcvbuf,
638		.maxlen		= sizeof(int),
639		.mode		= 0644,
640		.proc_handler	= &proc_dointvec,
641	},
642	{
643		.ctl_name	= NET_TCP_TSO_WIN_DIVISOR,
644		.procname	= "tcp_tso_win_divisor",
645		.data		= &sysctl_tcp_tso_win_divisor,
646		.maxlen		= sizeof(int),
647		.mode		= 0644,
648		.proc_handler	= &proc_dointvec,
649	},
650	{
651		.ctl_name	= NET_TCP_CONG_CONTROL,
652		.procname	= "tcp_congestion_control",
653		.mode		= 0644,
654		.maxlen		= TCP_CA_NAME_MAX,
655		.proc_handler	= &proc_tcp_congestion_control,
656		.strategy	= &sysctl_tcp_congestion_control,
657	},
658	{
659		.ctl_name	= NET_TCP_ABC,
660		.procname	= "tcp_abc",
661		.data		= &sysctl_tcp_abc,
662		.maxlen		= sizeof(int),
663		.mode		= 0644,
664		.proc_handler	= &proc_dointvec,
665	},
666
667	{ .ctl_name = 0 }
668};
669
670#endif /* CONFIG_SYSCTL */
671
672EXPORT_SYMBOL(ipv4_config);
673