sysctl_net_ipv4.c revision c319b4d76b9e583a5d88d6bf190e079c4e43213d 
1/*
2 * sysctl_net_ipv4.c: sysctl interface to net IPV4 subsystem.
3 *
4 * Begun April 1, 1996, Mike Shaver.
5 * Added /proc/sys/net/ipv4 directory entry (empty =) ). [MS]
6 */
7
8#include <linux/mm.h>
9#include <linux/module.h>
10#include <linux/sysctl.h>
11#include <linux/igmp.h>
12#include <linux/inetdevice.h>
13#include <linux/seqlock.h>
14#include <linux/init.h>
15#include <linux/slab.h>
16#include <linux/nsproxy.h>
17#include <net/snmp.h>
18#include <net/icmp.h>
19#include <net/ip.h>
20#include <net/route.h>
21#include <net/tcp.h>
22#include <net/udp.h>
23#include <net/cipso_ipv4.h>
24#include <net/inet_frag.h>
25#include <net/ping.h>
26
27static int zero;
28static int tcp_retr1_max = 255;
29static int ip_local_port_range_min[] = { 1, 1 };
30static int ip_local_port_range_max[] = { 65535, 65535 };
31static int tcp_adv_win_scale_min = -31;
32static int tcp_adv_win_scale_max = 31;
33static int ip_ttl_min = 1;
34static int ip_ttl_max = 255;
35static int ip_ping_group_range_min[] = { 0, 0 };
36static int ip_ping_group_range_max[] = { GID_T_MAX, GID_T_MAX };
37
38/* Update system visible IP port range */
39static void set_local_port_range(int range[2])
40{
41	write_seqlock(&sysctl_local_ports.lock);
42	sysctl_local_ports.range[0] = range[0];
43	sysctl_local_ports.range[1] = range[1];
44	write_sequnlock(&sysctl_local_ports.lock);
45}
46
47/* Validate changes from /proc interface. */
48static int ipv4_local_port_range(ctl_table *table, int write,
49				 void __user *buffer,
50				 size_t *lenp, loff_t *ppos)
51{
52	int ret;
53	int range[2];
54	ctl_table tmp = {
55		.data = &range,
56		.maxlen = sizeof(range),
57		.mode = table->mode,
58		.extra1 = &ip_local_port_range_min,
59		.extra2 = &ip_local_port_range_max,
60	};
61
62	inet_get_local_port_range(range, range + 1);
63	ret = proc_dointvec_minmax(&tmp, write, buffer, lenp, ppos);
64
65	if (write && ret == 0) {
66		if (range[1] < range[0])
67			ret = -EINVAL;
68		else
69			set_local_port_range(range);
70	}
71
72	return ret;
73}
74
75
76void inet_get_ping_group_range_net(struct net *net, gid_t *low, gid_t *high)
77{
78	gid_t *data = net->ipv4.sysctl_ping_group_range;
79	unsigned seq;
80	do {
81		seq = read_seqbegin(&sysctl_local_ports.lock);
82
83		*low = data[0];
84		*high = data[1];
85	} while (read_seqretry(&sysctl_local_ports.lock, seq));
86}
87
88void inet_get_ping_group_range_table(struct ctl_table *table, gid_t *low, gid_t *high)
89{
90	gid_t *data = table->data;
91	unsigned seq;
92	do {
93		seq = read_seqbegin(&sysctl_local_ports.lock);
94
95		*low = data[0];
96		*high = data[1];
97	} while (read_seqretry(&sysctl_local_ports.lock, seq));
98}
99
100/* Update system visible IP port range */
101static void set_ping_group_range(struct ctl_table *table, int range[2])
102{
103	gid_t *data = table->data;
104	write_seqlock(&sysctl_local_ports.lock);
105	data[0] = range[0];
106	data[1] = range[1];
107	write_sequnlock(&sysctl_local_ports.lock);
108}
109
110/* Validate changes from /proc interface. */
111static int ipv4_ping_group_range(ctl_table *table, int write,
112				 void __user *buffer,
113				 size_t *lenp, loff_t *ppos)
114{
115	int ret;
116	gid_t range[2];
117	ctl_table tmp = {
118		.data = &range,
119		.maxlen = sizeof(range),
120		.mode = table->mode,
121		.extra1 = &ip_ping_group_range_min,
122		.extra2 = &ip_ping_group_range_max,
123	};
124
125	inet_get_ping_group_range_table(table, range, range + 1);
126	ret = proc_dointvec_minmax(&tmp, write, buffer, lenp, ppos);
127
128	if (write && ret == 0)
129		set_ping_group_range(table, range);
130
131	return ret;
132}
133
134static int proc_tcp_congestion_control(ctl_table *ctl, int write,
135				       void __user *buffer, size_t *lenp, loff_t *ppos)
136{
137	char val[TCP_CA_NAME_MAX];
138	ctl_table tbl = {
139		.data = val,
140		.maxlen = TCP_CA_NAME_MAX,
141	};
142	int ret;
143
144	tcp_get_default_congestion_control(val);
145
146	ret = proc_dostring(&tbl, write, buffer, lenp, ppos);
147	if (write && ret == 0)
148		ret = tcp_set_default_congestion_control(val);
149	return ret;
150}
151
152static int proc_tcp_available_congestion_control(ctl_table *ctl,
153						 int write,
154						 void __user *buffer, size_t *lenp,
155						 loff_t *ppos)
156{
157	ctl_table tbl = { .maxlen = TCP_CA_BUF_MAX, };
158	int ret;
159
160	tbl.data = kmalloc(tbl.maxlen, GFP_USER);
161	if (!tbl.data)
162		return -ENOMEM;
163	tcp_get_available_congestion_control(tbl.data, TCP_CA_BUF_MAX);
164	ret = proc_dostring(&tbl, write, buffer, lenp, ppos);
165	kfree(tbl.data);
166	return ret;
167}
168
169static int proc_allowed_congestion_control(ctl_table *ctl,
170					   int write,
171					   void __user *buffer, size_t *lenp,
172					   loff_t *ppos)
173{
174	ctl_table tbl = { .maxlen = TCP_CA_BUF_MAX };
175	int ret;
176
177	tbl.data = kmalloc(tbl.maxlen, GFP_USER);
178	if (!tbl.data)
179		return -ENOMEM;
180
181	tcp_get_allowed_congestion_control(tbl.data, tbl.maxlen);
182	ret = proc_dostring(&tbl, write, buffer, lenp, ppos);
183	if (write && ret == 0)
184		ret = tcp_set_allowed_congestion_control(tbl.data);
185	kfree(tbl.data);
186	return ret;
187}
188
189static struct ctl_table ipv4_table[] = {
190	{
191		.procname	= "tcp_timestamps",
192		.data		= &sysctl_tcp_timestamps,
193		.maxlen		= sizeof(int),
194		.mode		= 0644,
195		.proc_handler	= proc_dointvec
196	},
197	{
198		.procname	= "tcp_window_scaling",
199		.data		= &sysctl_tcp_window_scaling,
200		.maxlen		= sizeof(int),
201		.mode		= 0644,
202		.proc_handler	= proc_dointvec
203	},
204	{
205		.procname	= "tcp_sack",
206		.data		= &sysctl_tcp_sack,
207		.maxlen		= sizeof(int),
208		.mode		= 0644,
209		.proc_handler	= proc_dointvec
210	},
211	{
212		.procname	= "tcp_retrans_collapse",
213		.data		= &sysctl_tcp_retrans_collapse,
214		.maxlen		= sizeof(int),
215		.mode		= 0644,
216		.proc_handler	= proc_dointvec
217	},
218	{
219		.procname	= "ip_default_ttl",
220		.data		= &sysctl_ip_default_ttl,
221		.maxlen		= sizeof(int),
222		.mode		= 0644,
223		.proc_handler	= proc_dointvec_minmax,
224		.extra1		= &ip_ttl_min,
225		.extra2		= &ip_ttl_max,
226	},
227	{
228		.procname	= "ip_no_pmtu_disc",
229		.data		= &ipv4_config.no_pmtu_disc,
230		.maxlen		= sizeof(int),
231		.mode		= 0644,
232		.proc_handler	= proc_dointvec
233	},
234	{
235		.procname	= "ip_nonlocal_bind",
236		.data		= &sysctl_ip_nonlocal_bind,
237		.maxlen		= sizeof(int),
238		.mode		= 0644,
239		.proc_handler	= proc_dointvec
240	},
241	{
242		.procname	= "tcp_syn_retries",
243		.data		= &sysctl_tcp_syn_retries,
244		.maxlen		= sizeof(int),
245		.mode		= 0644,
246		.proc_handler	= proc_dointvec
247	},
248	{
249		.procname	= "tcp_synack_retries",
250		.data		= &sysctl_tcp_synack_retries,
251		.maxlen		= sizeof(int),
252		.mode		= 0644,
253		.proc_handler	= proc_dointvec
254	},
255	{
256		.procname	= "tcp_max_orphans",
257		.data		= &sysctl_tcp_max_orphans,
258		.maxlen		= sizeof(int),
259		.mode		= 0644,
260		.proc_handler	= proc_dointvec
261	},
262	{
263		.procname	= "tcp_max_tw_buckets",
264		.data		= &tcp_death_row.sysctl_max_tw_buckets,
265		.maxlen		= sizeof(int),
266		.mode		= 0644,
267		.proc_handler	= proc_dointvec
268	},
269	{
270		.procname	= "ip_dynaddr",
271		.data		= &sysctl_ip_dynaddr,
272		.maxlen		= sizeof(int),
273		.mode		= 0644,
274		.proc_handler	= proc_dointvec
275	},
276	{
277		.procname	= "tcp_keepalive_time",
278		.data		= &sysctl_tcp_keepalive_time,
279		.maxlen		= sizeof(int),
280		.mode		= 0644,
281		.proc_handler	= proc_dointvec_jiffies,
282	},
283	{
284		.procname	= "tcp_keepalive_probes",
285		.data		= &sysctl_tcp_keepalive_probes,
286		.maxlen		= sizeof(int),
287		.mode		= 0644,
288		.proc_handler	= proc_dointvec
289	},
290	{
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	},
297	{
298		.procname	= "tcp_retries1",
299		.data		= &sysctl_tcp_retries1,
300		.maxlen		= sizeof(int),
301		.mode		= 0644,
302		.proc_handler	= proc_dointvec_minmax,
303		.extra2		= &tcp_retr1_max
304	},
305	{
306		.procname	= "tcp_retries2",
307		.data		= &sysctl_tcp_retries2,
308		.maxlen		= sizeof(int),
309		.mode		= 0644,
310		.proc_handler	= proc_dointvec
311	},
312	{
313		.procname	= "tcp_fin_timeout",
314		.data		= &sysctl_tcp_fin_timeout,
315		.maxlen		= sizeof(int),
316		.mode		= 0644,
317		.proc_handler	= proc_dointvec_jiffies,
318	},
319#ifdef CONFIG_SYN_COOKIES
320	{
321		.procname	= "tcp_syncookies",
322		.data		= &sysctl_tcp_syncookies,
323		.maxlen		= sizeof(int),
324		.mode		= 0644,
325		.proc_handler	= proc_dointvec
326	},
327#endif
328	{
329		.procname	= "tcp_tw_recycle",
330		.data		= &tcp_death_row.sysctl_tw_recycle,
331		.maxlen		= sizeof(int),
332		.mode		= 0644,
333		.proc_handler	= proc_dointvec
334	},
335	{
336		.procname	= "tcp_abort_on_overflow",
337		.data		= &sysctl_tcp_abort_on_overflow,
338		.maxlen		= sizeof(int),
339		.mode		= 0644,
340		.proc_handler	= proc_dointvec
341	},
342	{
343		.procname	= "tcp_stdurg",
344		.data		= &sysctl_tcp_stdurg,
345		.maxlen		= sizeof(int),
346		.mode		= 0644,
347		.proc_handler	= proc_dointvec
348	},
349	{
350		.procname	= "tcp_rfc1337",
351		.data		= &sysctl_tcp_rfc1337,
352		.maxlen		= sizeof(int),
353		.mode		= 0644,
354		.proc_handler	= proc_dointvec
355	},
356	{
357		.procname	= "tcp_max_syn_backlog",
358		.data		= &sysctl_max_syn_backlog,
359		.maxlen		= sizeof(int),
360		.mode		= 0644,
361		.proc_handler	= proc_dointvec
362	},
363	{
364		.procname	= "ip_local_port_range",
365		.data		= &sysctl_local_ports.range,
366		.maxlen		= sizeof(sysctl_local_ports.range),
367		.mode		= 0644,
368		.proc_handler	= ipv4_local_port_range,
369	},
370	{
371		.procname	= "ip_local_reserved_ports",
372		.data		= NULL, /* initialized in sysctl_ipv4_init */
373		.maxlen		= 65536,
374		.mode		= 0644,
375		.proc_handler	= proc_do_large_bitmap,
376	},
377	{
378		.procname	= "igmp_max_memberships",
379		.data		= &sysctl_igmp_max_memberships,
380		.maxlen		= sizeof(int),
381		.mode		= 0644,
382		.proc_handler	= proc_dointvec
383	},
384	{
385		.procname	= "igmp_max_msf",
386		.data		= &sysctl_igmp_max_msf,
387		.maxlen		= sizeof(int),
388		.mode		= 0644,
389		.proc_handler	= proc_dointvec
390	},
391	{
392		.procname	= "inet_peer_threshold",
393		.data		= &inet_peer_threshold,
394		.maxlen		= sizeof(int),
395		.mode		= 0644,
396		.proc_handler	= proc_dointvec
397	},
398	{
399		.procname	= "inet_peer_minttl",
400		.data		= &inet_peer_minttl,
401		.maxlen		= sizeof(int),
402		.mode		= 0644,
403		.proc_handler	= proc_dointvec_jiffies,
404	},
405	{
406		.procname	= "inet_peer_maxttl",
407		.data		= &inet_peer_maxttl,
408		.maxlen		= sizeof(int),
409		.mode		= 0644,
410		.proc_handler	= proc_dointvec_jiffies,
411	},
412	{
413		.procname	= "inet_peer_gc_mintime",
414		.data		= &inet_peer_gc_mintime,
415		.maxlen		= sizeof(int),
416		.mode		= 0644,
417		.proc_handler	= proc_dointvec_jiffies,
418	},
419	{
420		.procname	= "inet_peer_gc_maxtime",
421		.data		= &inet_peer_gc_maxtime,
422		.maxlen		= sizeof(int),
423		.mode		= 0644,
424		.proc_handler	= proc_dointvec_jiffies,
425	},
426	{
427		.procname	= "tcp_orphan_retries",
428		.data		= &sysctl_tcp_orphan_retries,
429		.maxlen		= sizeof(int),
430		.mode		= 0644,
431		.proc_handler	= proc_dointvec
432	},
433	{
434		.procname	= "tcp_fack",
435		.data		= &sysctl_tcp_fack,
436		.maxlen		= sizeof(int),
437		.mode		= 0644,
438		.proc_handler	= proc_dointvec
439	},
440	{
441		.procname	= "tcp_reordering",
442		.data		= &sysctl_tcp_reordering,
443		.maxlen		= sizeof(int),
444		.mode		= 0644,
445		.proc_handler	= proc_dointvec
446	},
447	{
448		.procname	= "tcp_ecn",
449		.data		= &sysctl_tcp_ecn,
450		.maxlen		= sizeof(int),
451		.mode		= 0644,
452		.proc_handler	= proc_dointvec
453	},
454	{
455		.procname	= "tcp_dsack",
456		.data		= &sysctl_tcp_dsack,
457		.maxlen		= sizeof(int),
458		.mode		= 0644,
459		.proc_handler	= proc_dointvec
460	},
461	{
462		.procname	= "tcp_mem",
463		.data		= &sysctl_tcp_mem,
464		.maxlen		= sizeof(sysctl_tcp_mem),
465		.mode		= 0644,
466		.proc_handler	= proc_doulongvec_minmax
467	},
468	{
469		.procname	= "tcp_wmem",
470		.data		= &sysctl_tcp_wmem,
471		.maxlen		= sizeof(sysctl_tcp_wmem),
472		.mode		= 0644,
473		.proc_handler	= proc_dointvec
474	},
475	{
476		.procname	= "tcp_rmem",
477		.data		= &sysctl_tcp_rmem,
478		.maxlen		= sizeof(sysctl_tcp_rmem),
479		.mode		= 0644,
480		.proc_handler	= proc_dointvec
481	},
482	{
483		.procname	= "tcp_app_win",
484		.data		= &sysctl_tcp_app_win,
485		.maxlen		= sizeof(int),
486		.mode		= 0644,
487		.proc_handler	= proc_dointvec
488	},
489	{
490		.procname	= "tcp_adv_win_scale",
491		.data		= &sysctl_tcp_adv_win_scale,
492		.maxlen		= sizeof(int),
493		.mode		= 0644,
494		.proc_handler	= proc_dointvec_minmax,
495		.extra1		= &tcp_adv_win_scale_min,
496		.extra2		= &tcp_adv_win_scale_max,
497	},
498	{
499		.procname	= "tcp_tw_reuse",
500		.data		= &sysctl_tcp_tw_reuse,
501		.maxlen		= sizeof(int),
502		.mode		= 0644,
503		.proc_handler	= proc_dointvec
504	},
505	{
506		.procname	= "tcp_frto",
507		.data		= &sysctl_tcp_frto,
508		.maxlen		= sizeof(int),
509		.mode		= 0644,
510		.proc_handler	= proc_dointvec
511	},
512	{
513		.procname	= "tcp_frto_response",
514		.data		= &sysctl_tcp_frto_response,
515		.maxlen		= sizeof(int),
516		.mode		= 0644,
517		.proc_handler	= proc_dointvec
518	},
519	{
520		.procname	= "tcp_low_latency",
521		.data		= &sysctl_tcp_low_latency,
522		.maxlen		= sizeof(int),
523		.mode		= 0644,
524		.proc_handler	= proc_dointvec
525	},
526	{
527		.procname	= "tcp_no_metrics_save",
528		.data		= &sysctl_tcp_nometrics_save,
529		.maxlen		= sizeof(int),
530		.mode		= 0644,
531		.proc_handler	= proc_dointvec,
532	},
533	{
534		.procname	= "tcp_moderate_rcvbuf",
535		.data		= &sysctl_tcp_moderate_rcvbuf,
536		.maxlen		= sizeof(int),
537		.mode		= 0644,
538		.proc_handler	= proc_dointvec,
539	},
540	{
541		.procname	= "tcp_tso_win_divisor",
542		.data		= &sysctl_tcp_tso_win_divisor,
543		.maxlen		= sizeof(int),
544		.mode		= 0644,
545		.proc_handler	= proc_dointvec,
546	},
547	{
548		.procname	= "tcp_congestion_control",
549		.mode		= 0644,
550		.maxlen		= TCP_CA_NAME_MAX,
551		.proc_handler	= proc_tcp_congestion_control,
552	},
553	{
554		.procname	= "tcp_abc",
555		.data		= &sysctl_tcp_abc,
556		.maxlen		= sizeof(int),
557		.mode		= 0644,
558		.proc_handler	= proc_dointvec,
559	},
560	{
561		.procname	= "tcp_mtu_probing",
562		.data		= &sysctl_tcp_mtu_probing,
563		.maxlen		= sizeof(int),
564		.mode		= 0644,
565		.proc_handler	= proc_dointvec,
566	},
567	{
568		.procname	= "tcp_base_mss",
569		.data		= &sysctl_tcp_base_mss,
570		.maxlen		= sizeof(int),
571		.mode		= 0644,
572		.proc_handler	= proc_dointvec,
573	},
574	{
575		.procname	= "tcp_workaround_signed_windows",
576		.data		= &sysctl_tcp_workaround_signed_windows,
577		.maxlen		= sizeof(int),
578		.mode		= 0644,
579		.proc_handler	= proc_dointvec
580	},
581#ifdef CONFIG_NET_DMA
582	{
583		.procname	= "tcp_dma_copybreak",
584		.data		= &sysctl_tcp_dma_copybreak,
585		.maxlen		= sizeof(int),
586		.mode		= 0644,
587		.proc_handler	= proc_dointvec
588	},
589#endif
590	{
591		.procname	= "tcp_slow_start_after_idle",
592		.data		= &sysctl_tcp_slow_start_after_idle,
593		.maxlen		= sizeof(int),
594		.mode		= 0644,
595		.proc_handler	= proc_dointvec
596	},
597#ifdef CONFIG_NETLABEL
598	{
599		.procname	= "cipso_cache_enable",
600		.data		= &cipso_v4_cache_enabled,
601		.maxlen		= sizeof(int),
602		.mode		= 0644,
603		.proc_handler	= proc_dointvec,
604	},
605	{
606		.procname	= "cipso_cache_bucket_size",
607		.data		= &cipso_v4_cache_bucketsize,
608		.maxlen		= sizeof(int),
609		.mode		= 0644,
610		.proc_handler	= proc_dointvec,
611	},
612	{
613		.procname	= "cipso_rbm_optfmt",
614		.data		= &cipso_v4_rbm_optfmt,
615		.maxlen		= sizeof(int),
616		.mode		= 0644,
617		.proc_handler	= proc_dointvec,
618	},
619	{
620		.procname	= "cipso_rbm_strictvalid",
621		.data		= &cipso_v4_rbm_strictvalid,
622		.maxlen		= sizeof(int),
623		.mode		= 0644,
624		.proc_handler	= proc_dointvec,
625	},
626#endif /* CONFIG_NETLABEL */
627	{
628		.procname	= "tcp_available_congestion_control",
629		.maxlen		= TCP_CA_BUF_MAX,
630		.mode		= 0444,
631		.proc_handler   = proc_tcp_available_congestion_control,
632	},
633	{
634		.procname	= "tcp_allowed_congestion_control",
635		.maxlen		= TCP_CA_BUF_MAX,
636		.mode		= 0644,
637		.proc_handler   = proc_allowed_congestion_control,
638	},
639	{
640		.procname	= "tcp_max_ssthresh",
641		.data		= &sysctl_tcp_max_ssthresh,
642		.maxlen		= sizeof(int),
643		.mode		= 0644,
644		.proc_handler	= proc_dointvec,
645	},
646	{
647		.procname	= "tcp_cookie_size",
648		.data		= &sysctl_tcp_cookie_size,
649		.maxlen		= sizeof(int),
650		.mode		= 0644,
651		.proc_handler	= proc_dointvec
652	},
653	{
654		.procname       = "tcp_thin_linear_timeouts",
655		.data           = &sysctl_tcp_thin_linear_timeouts,
656		.maxlen         = sizeof(int),
657		.mode           = 0644,
658		.proc_handler   = proc_dointvec
659	},
660        {
661		.procname       = "tcp_thin_dupack",
662		.data           = &sysctl_tcp_thin_dupack,
663		.maxlen         = sizeof(int),
664		.mode           = 0644,
665		.proc_handler   = proc_dointvec
666	},
667	{
668		.procname	= "udp_mem",
669		.data		= &sysctl_udp_mem,
670		.maxlen		= sizeof(sysctl_udp_mem),
671		.mode		= 0644,
672		.proc_handler	= proc_doulongvec_minmax,
673	},
674	{
675		.procname	= "udp_rmem_min",
676		.data		= &sysctl_udp_rmem_min,
677		.maxlen		= sizeof(sysctl_udp_rmem_min),
678		.mode		= 0644,
679		.proc_handler	= proc_dointvec_minmax,
680		.extra1		= &zero
681	},
682	{
683		.procname	= "udp_wmem_min",
684		.data		= &sysctl_udp_wmem_min,
685		.maxlen		= sizeof(sysctl_udp_wmem_min),
686		.mode		= 0644,
687		.proc_handler	= proc_dointvec_minmax,
688		.extra1		= &zero
689	},
690	{ }
691};
692
693static struct ctl_table ipv4_net_table[] = {
694	{
695		.procname	= "icmp_echo_ignore_all",
696		.data		= &init_net.ipv4.sysctl_icmp_echo_ignore_all,
697		.maxlen		= sizeof(int),
698		.mode		= 0644,
699		.proc_handler	= proc_dointvec
700	},
701	{
702		.procname	= "icmp_echo_ignore_broadcasts",
703		.data		= &init_net.ipv4.sysctl_icmp_echo_ignore_broadcasts,
704		.maxlen		= sizeof(int),
705		.mode		= 0644,
706		.proc_handler	= proc_dointvec
707	},
708	{
709		.procname	= "icmp_ignore_bogus_error_responses",
710		.data		= &init_net.ipv4.sysctl_icmp_ignore_bogus_error_responses,
711		.maxlen		= sizeof(int),
712		.mode		= 0644,
713		.proc_handler	= proc_dointvec
714	},
715	{
716		.procname	= "icmp_errors_use_inbound_ifaddr",
717		.data		= &init_net.ipv4.sysctl_icmp_errors_use_inbound_ifaddr,
718		.maxlen		= sizeof(int),
719		.mode		= 0644,
720		.proc_handler	= proc_dointvec
721	},
722	{
723		.procname	= "icmp_ratelimit",
724		.data		= &init_net.ipv4.sysctl_icmp_ratelimit,
725		.maxlen		= sizeof(int),
726		.mode		= 0644,
727		.proc_handler	= proc_dointvec_ms_jiffies,
728	},
729	{
730		.procname	= "icmp_ratemask",
731		.data		= &init_net.ipv4.sysctl_icmp_ratemask,
732		.maxlen		= sizeof(int),
733		.mode		= 0644,
734		.proc_handler	= proc_dointvec
735	},
736	{
737		.procname	= "rt_cache_rebuild_count",
738		.data		= &init_net.ipv4.sysctl_rt_cache_rebuild_count,
739		.maxlen		= sizeof(int),
740		.mode		= 0644,
741		.proc_handler	= proc_dointvec
742	},
743	{
744		.procname	= "ping_group_range",
745		.data		= &init_net.ipv4.sysctl_ping_group_range,
746		.maxlen		= sizeof(init_net.ipv4.sysctl_ping_group_range),
747		.mode		= 0644,
748		.proc_handler	= ipv4_ping_group_range,
749	},
750	{ }
751};
752
753struct ctl_path net_ipv4_ctl_path[] = {
754	{ .procname = "net", },
755	{ .procname = "ipv4", },
756	{ },
757};
758EXPORT_SYMBOL_GPL(net_ipv4_ctl_path);
759
760static __net_init int ipv4_sysctl_init_net(struct net *net)
761{
762	struct ctl_table *table;
763
764	table = ipv4_net_table;
765	if (!net_eq(net, &init_net)) {
766		table = kmemdup(table, sizeof(ipv4_net_table), GFP_KERNEL);
767		if (table == NULL)
768			goto err_alloc;
769
770		table[0].data =
771			&net->ipv4.sysctl_icmp_echo_ignore_all;
772		table[1].data =
773			&net->ipv4.sysctl_icmp_echo_ignore_broadcasts;
774		table[2].data =
775			&net->ipv4.sysctl_icmp_ignore_bogus_error_responses;
776		table[3].data =
777			&net->ipv4.sysctl_icmp_errors_use_inbound_ifaddr;
778		table[4].data =
779			&net->ipv4.sysctl_icmp_ratelimit;
780		table[5].data =
781			&net->ipv4.sysctl_icmp_ratemask;
782		table[6].data =
783			&net->ipv4.sysctl_rt_cache_rebuild_count;
784		table[7].data =
785			&net->ipv4.sysctl_ping_group_range;
786
787	}
788
789	/*
790	 * Sane defaults - nobody may create ping sockets.
791	 * Boot scripts should set this to distro-specific group.
792	 */
793	net->ipv4.sysctl_ping_group_range[0] = 1;
794	net->ipv4.sysctl_ping_group_range[1] = 0;
795
796	net->ipv4.sysctl_rt_cache_rebuild_count = 4;
797
798	net->ipv4.ipv4_hdr = register_net_sysctl_table(net,
799			net_ipv4_ctl_path, table);
800	if (net->ipv4.ipv4_hdr == NULL)
801		goto err_reg;
802
803	return 0;
804
805err_reg:
806	if (!net_eq(net, &init_net))
807		kfree(table);
808err_alloc:
809	return -ENOMEM;
810}
811
812static __net_exit void ipv4_sysctl_exit_net(struct net *net)
813{
814	struct ctl_table *table;
815
816	table = net->ipv4.ipv4_hdr->ctl_table_arg;
817	unregister_net_sysctl_table(net->ipv4.ipv4_hdr);
818	kfree(table);
819}
820
821static __net_initdata struct pernet_operations ipv4_sysctl_ops = {
822	.init = ipv4_sysctl_init_net,
823	.exit = ipv4_sysctl_exit_net,
824};
825
826static __init int sysctl_ipv4_init(void)
827{
828	struct ctl_table_header *hdr;
829	struct ctl_table *i;
830
831	for (i = ipv4_table; i->procname; i++) {
832		if (strcmp(i->procname, "ip_local_reserved_ports") == 0) {
833			i->data = sysctl_local_reserved_ports;
834			break;
835		}
836	}
837	if (!i->procname)
838		return -EINVAL;
839
840	hdr = register_sysctl_paths(net_ipv4_ctl_path, ipv4_table);
841	if (hdr == NULL)
842		return -ENOMEM;
843
844	if (register_pernet_subsys(&ipv4_sysctl_ops)) {
845		unregister_sysctl_table(hdr);
846		return -ENOMEM;
847	}
848
849	return 0;
850}
851
852__initcall(sysctl_ipv4_init);
853