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include cleanup: Update gfp.h and slab.h includes to prepare for breaking implicit...
[thirdparty/kernel/stable.git] / net / ipv4 / sysctl_net_ipv4.c
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 <net/snmp.h>
17 #include <net/icmp.h>
18 #include <net/ip.h>
19 #include <net/route.h>
20 #include <net/tcp.h>
21 #include <net/udp.h>
22 #include <net/cipso_ipv4.h>
23 #include <net/inet_frag.h>
24
25 static int zero;
26 static int tcp_retr1_max = 255;
27 static int ip_local_port_range_min[] = { 1, 1 };
28 static int ip_local_port_range_max[] = { 65535, 65535 };
29
30 /* Update system visible IP port range */
31 static void set_local_port_range(int range[2])
32 {
33 write_seqlock(&sysctl_local_ports.lock);
34 sysctl_local_ports.range[0] = range[0];
35 sysctl_local_ports.range[1] = range[1];
36 write_sequnlock(&sysctl_local_ports.lock);
37 }
38
39 /* Validate changes from /proc interface. */
40 static int ipv4_local_port_range(ctl_table *table, int write,
41 void __user *buffer,
42 size_t *lenp, loff_t *ppos)
43 {
44 int ret;
45 int range[2];
46 ctl_table tmp = {
47 .data = &range,
48 .maxlen = sizeof(range),
49 .mode = table->mode,
50 .extra1 = &ip_local_port_range_min,
51 .extra2 = &ip_local_port_range_max,
52 };
53
54 inet_get_local_port_range(range, range + 1);
55 ret = proc_dointvec_minmax(&tmp, write, buffer, lenp, ppos);
56
57 if (write && ret == 0) {
58 if (range[1] < range[0])
59 ret = -EINVAL;
60 else
61 set_local_port_range(range);
62 }
63
64 return ret;
65 }
66
67 static int proc_tcp_congestion_control(ctl_table *ctl, int write,
68 void __user *buffer, size_t *lenp, loff_t *ppos)
69 {
70 char val[TCP_CA_NAME_MAX];
71 ctl_table tbl = {
72 .data = val,
73 .maxlen = TCP_CA_NAME_MAX,
74 };
75 int ret;
76
77 tcp_get_default_congestion_control(val);
78
79 ret = proc_dostring(&tbl, write, buffer, lenp, ppos);
80 if (write && ret == 0)
81 ret = tcp_set_default_congestion_control(val);
82 return ret;
83 }
84
85 static int proc_tcp_available_congestion_control(ctl_table *ctl,
86 int write,
87 void __user *buffer, size_t *lenp,
88 loff_t *ppos)
89 {
90 ctl_table tbl = { .maxlen = TCP_CA_BUF_MAX, };
91 int ret;
92
93 tbl.data = kmalloc(tbl.maxlen, GFP_USER);
94 if (!tbl.data)
95 return -ENOMEM;
96 tcp_get_available_congestion_control(tbl.data, TCP_CA_BUF_MAX);
97 ret = proc_dostring(&tbl, write, buffer, lenp, ppos);
98 kfree(tbl.data);
99 return ret;
100 }
101
102 static int proc_allowed_congestion_control(ctl_table *ctl,
103 int write,
104 void __user *buffer, size_t *lenp,
105 loff_t *ppos)
106 {
107 ctl_table tbl = { .maxlen = TCP_CA_BUF_MAX };
108 int ret;
109
110 tbl.data = kmalloc(tbl.maxlen, GFP_USER);
111 if (!tbl.data)
112 return -ENOMEM;
113
114 tcp_get_allowed_congestion_control(tbl.data, tbl.maxlen);
115 ret = proc_dostring(&tbl, write, buffer, lenp, ppos);
116 if (write && ret == 0)
117 ret = tcp_set_allowed_congestion_control(tbl.data);
118 kfree(tbl.data);
119 return ret;
120 }
121
122 static struct ctl_table ipv4_table[] = {
123 {
124 .procname = "tcp_timestamps",
125 .data = &sysctl_tcp_timestamps,
126 .maxlen = sizeof(int),
127 .mode = 0644,
128 .proc_handler = proc_dointvec
129 },
130 {
131 .procname = "tcp_window_scaling",
132 .data = &sysctl_tcp_window_scaling,
133 .maxlen = sizeof(int),
134 .mode = 0644,
135 .proc_handler = proc_dointvec
136 },
137 {
138 .procname = "tcp_sack",
139 .data = &sysctl_tcp_sack,
140 .maxlen = sizeof(int),
141 .mode = 0644,
142 .proc_handler = proc_dointvec
143 },
144 {
145 .procname = "tcp_retrans_collapse",
146 .data = &sysctl_tcp_retrans_collapse,
147 .maxlen = sizeof(int),
148 .mode = 0644,
149 .proc_handler = proc_dointvec
150 },
151 {
152 .procname = "ip_default_ttl",
153 .data = &sysctl_ip_default_ttl,
154 .maxlen = sizeof(int),
155 .mode = 0644,
156 .proc_handler = ipv4_doint_and_flush,
157 .extra2 = &init_net,
158 },
159 {
160 .procname = "ip_no_pmtu_disc",
161 .data = &ipv4_config.no_pmtu_disc,
162 .maxlen = sizeof(int),
163 .mode = 0644,
164 .proc_handler = proc_dointvec
165 },
166 {
167 .procname = "ip_nonlocal_bind",
168 .data = &sysctl_ip_nonlocal_bind,
169 .maxlen = sizeof(int),
170 .mode = 0644,
171 .proc_handler = proc_dointvec
172 },
173 {
174 .procname = "tcp_syn_retries",
175 .data = &sysctl_tcp_syn_retries,
176 .maxlen = sizeof(int),
177 .mode = 0644,
178 .proc_handler = proc_dointvec
179 },
180 {
181 .procname = "tcp_synack_retries",
182 .data = &sysctl_tcp_synack_retries,
183 .maxlen = sizeof(int),
184 .mode = 0644,
185 .proc_handler = proc_dointvec
186 },
187 {
188 .procname = "tcp_max_orphans",
189 .data = &sysctl_tcp_max_orphans,
190 .maxlen = sizeof(int),
191 .mode = 0644,
192 .proc_handler = proc_dointvec
193 },
194 {
195 .procname = "tcp_max_tw_buckets",
196 .data = &tcp_death_row.sysctl_max_tw_buckets,
197 .maxlen = sizeof(int),
198 .mode = 0644,
199 .proc_handler = proc_dointvec
200 },
201 {
202 .procname = "ip_dynaddr",
203 .data = &sysctl_ip_dynaddr,
204 .maxlen = sizeof(int),
205 .mode = 0644,
206 .proc_handler = proc_dointvec
207 },
208 {
209 .procname = "tcp_keepalive_time",
210 .data = &sysctl_tcp_keepalive_time,
211 .maxlen = sizeof(int),
212 .mode = 0644,
213 .proc_handler = proc_dointvec_jiffies,
214 },
215 {
216 .procname = "tcp_keepalive_probes",
217 .data = &sysctl_tcp_keepalive_probes,
218 .maxlen = sizeof(int),
219 .mode = 0644,
220 .proc_handler = proc_dointvec
221 },
222 {
223 .procname = "tcp_keepalive_intvl",
224 .data = &sysctl_tcp_keepalive_intvl,
225 .maxlen = sizeof(int),
226 .mode = 0644,
227 .proc_handler = proc_dointvec_jiffies,
228 },
229 {
230 .procname = "tcp_retries1",
231 .data = &sysctl_tcp_retries1,
232 .maxlen = sizeof(int),
233 .mode = 0644,
234 .proc_handler = proc_dointvec_minmax,
235 .extra2 = &tcp_retr1_max
236 },
237 {
238 .procname = "tcp_retries2",
239 .data = &sysctl_tcp_retries2,
240 .maxlen = sizeof(int),
241 .mode = 0644,
242 .proc_handler = proc_dointvec
243 },
244 {
245 .procname = "tcp_fin_timeout",
246 .data = &sysctl_tcp_fin_timeout,
247 .maxlen = sizeof(int),
248 .mode = 0644,
249 .proc_handler = proc_dointvec_jiffies,
250 },
251 #ifdef CONFIG_SYN_COOKIES
252 {
253 .procname = "tcp_syncookies",
254 .data = &sysctl_tcp_syncookies,
255 .maxlen = sizeof(int),
256 .mode = 0644,
257 .proc_handler = proc_dointvec
258 },
259 #endif
260 {
261 .procname = "tcp_tw_recycle",
262 .data = &tcp_death_row.sysctl_tw_recycle,
263 .maxlen = sizeof(int),
264 .mode = 0644,
265 .proc_handler = proc_dointvec
266 },
267 {
268 .procname = "tcp_abort_on_overflow",
269 .data = &sysctl_tcp_abort_on_overflow,
270 .maxlen = sizeof(int),
271 .mode = 0644,
272 .proc_handler = proc_dointvec
273 },
274 {
275 .procname = "tcp_stdurg",
276 .data = &sysctl_tcp_stdurg,
277 .maxlen = sizeof(int),
278 .mode = 0644,
279 .proc_handler = proc_dointvec
280 },
281 {
282 .procname = "tcp_rfc1337",
283 .data = &sysctl_tcp_rfc1337,
284 .maxlen = sizeof(int),
285 .mode = 0644,
286 .proc_handler = proc_dointvec
287 },
288 {
289 .procname = "tcp_max_syn_backlog",
290 .data = &sysctl_max_syn_backlog,
291 .maxlen = sizeof(int),
292 .mode = 0644,
293 .proc_handler = proc_dointvec
294 },
295 {
296 .procname = "ip_local_port_range",
297 .data = &sysctl_local_ports.range,
298 .maxlen = sizeof(sysctl_local_ports.range),
299 .mode = 0644,
300 .proc_handler = ipv4_local_port_range,
301 },
302 #ifdef CONFIG_IP_MULTICAST
303 {
304 .procname = "igmp_max_memberships",
305 .data = &sysctl_igmp_max_memberships,
306 .maxlen = sizeof(int),
307 .mode = 0644,
308 .proc_handler = proc_dointvec
309 },
310
311 #endif
312 {
313 .procname = "igmp_max_msf",
314 .data = &sysctl_igmp_max_msf,
315 .maxlen = sizeof(int),
316 .mode = 0644,
317 .proc_handler = proc_dointvec
318 },
319 {
320 .procname = "inet_peer_threshold",
321 .data = &inet_peer_threshold,
322 .maxlen = sizeof(int),
323 .mode = 0644,
324 .proc_handler = proc_dointvec
325 },
326 {
327 .procname = "inet_peer_minttl",
328 .data = &inet_peer_minttl,
329 .maxlen = sizeof(int),
330 .mode = 0644,
331 .proc_handler = proc_dointvec_jiffies,
332 },
333 {
334 .procname = "inet_peer_maxttl",
335 .data = &inet_peer_maxttl,
336 .maxlen = sizeof(int),
337 .mode = 0644,
338 .proc_handler = proc_dointvec_jiffies,
339 },
340 {
341 .procname = "inet_peer_gc_mintime",
342 .data = &inet_peer_gc_mintime,
343 .maxlen = sizeof(int),
344 .mode = 0644,
345 .proc_handler = proc_dointvec_jiffies,
346 },
347 {
348 .procname = "inet_peer_gc_maxtime",
349 .data = &inet_peer_gc_maxtime,
350 .maxlen = sizeof(int),
351 .mode = 0644,
352 .proc_handler = proc_dointvec_jiffies,
353 },
354 {
355 .procname = "tcp_orphan_retries",
356 .data = &sysctl_tcp_orphan_retries,
357 .maxlen = sizeof(int),
358 .mode = 0644,
359 .proc_handler = proc_dointvec
360 },
361 {
362 .procname = "tcp_fack",
363 .data = &sysctl_tcp_fack,
364 .maxlen = sizeof(int),
365 .mode = 0644,
366 .proc_handler = proc_dointvec
367 },
368 {
369 .procname = "tcp_reordering",
370 .data = &sysctl_tcp_reordering,
371 .maxlen = sizeof(int),
372 .mode = 0644,
373 .proc_handler = proc_dointvec
374 },
375 {
376 .procname = "tcp_ecn",
377 .data = &sysctl_tcp_ecn,
378 .maxlen = sizeof(int),
379 .mode = 0644,
380 .proc_handler = proc_dointvec
381 },
382 {
383 .procname = "tcp_dsack",
384 .data = &sysctl_tcp_dsack,
385 .maxlen = sizeof(int),
386 .mode = 0644,
387 .proc_handler = proc_dointvec
388 },
389 {
390 .procname = "tcp_mem",
391 .data = &sysctl_tcp_mem,
392 .maxlen = sizeof(sysctl_tcp_mem),
393 .mode = 0644,
394 .proc_handler = proc_dointvec
395 },
396 {
397 .procname = "tcp_wmem",
398 .data = &sysctl_tcp_wmem,
399 .maxlen = sizeof(sysctl_tcp_wmem),
400 .mode = 0644,
401 .proc_handler = proc_dointvec
402 },
403 {
404 .procname = "tcp_rmem",
405 .data = &sysctl_tcp_rmem,
406 .maxlen = sizeof(sysctl_tcp_rmem),
407 .mode = 0644,
408 .proc_handler = proc_dointvec
409 },
410 {
411 .procname = "tcp_app_win",
412 .data = &sysctl_tcp_app_win,
413 .maxlen = sizeof(int),
414 .mode = 0644,
415 .proc_handler = proc_dointvec
416 },
417 {
418 .procname = "tcp_adv_win_scale",
419 .data = &sysctl_tcp_adv_win_scale,
420 .maxlen = sizeof(int),
421 .mode = 0644,
422 .proc_handler = proc_dointvec
423 },
424 {
425 .procname = "tcp_tw_reuse",
426 .data = &sysctl_tcp_tw_reuse,
427 .maxlen = sizeof(int),
428 .mode = 0644,
429 .proc_handler = proc_dointvec
430 },
431 {
432 .procname = "tcp_frto",
433 .data = &sysctl_tcp_frto,
434 .maxlen = sizeof(int),
435 .mode = 0644,
436 .proc_handler = proc_dointvec
437 },
438 {
439 .procname = "tcp_frto_response",
440 .data = &sysctl_tcp_frto_response,
441 .maxlen = sizeof(int),
442 .mode = 0644,
443 .proc_handler = proc_dointvec
444 },
445 {
446 .procname = "tcp_low_latency",
447 .data = &sysctl_tcp_low_latency,
448 .maxlen = sizeof(int),
449 .mode = 0644,
450 .proc_handler = proc_dointvec
451 },
452 {
453 .procname = "tcp_no_metrics_save",
454 .data = &sysctl_tcp_nometrics_save,
455 .maxlen = sizeof(int),
456 .mode = 0644,
457 .proc_handler = proc_dointvec,
458 },
459 {
460 .procname = "tcp_moderate_rcvbuf",
461 .data = &sysctl_tcp_moderate_rcvbuf,
462 .maxlen = sizeof(int),
463 .mode = 0644,
464 .proc_handler = proc_dointvec,
465 },
466 {
467 .procname = "tcp_tso_win_divisor",
468 .data = &sysctl_tcp_tso_win_divisor,
469 .maxlen = sizeof(int),
470 .mode = 0644,
471 .proc_handler = proc_dointvec,
472 },
473 {
474 .procname = "tcp_congestion_control",
475 .mode = 0644,
476 .maxlen = TCP_CA_NAME_MAX,
477 .proc_handler = proc_tcp_congestion_control,
478 },
479 {
480 .procname = "tcp_abc",
481 .data = &sysctl_tcp_abc,
482 .maxlen = sizeof(int),
483 .mode = 0644,
484 .proc_handler = proc_dointvec,
485 },
486 {
487 .procname = "tcp_mtu_probing",
488 .data = &sysctl_tcp_mtu_probing,
489 .maxlen = sizeof(int),
490 .mode = 0644,
491 .proc_handler = proc_dointvec,
492 },
493 {
494 .procname = "tcp_base_mss",
495 .data = &sysctl_tcp_base_mss,
496 .maxlen = sizeof(int),
497 .mode = 0644,
498 .proc_handler = proc_dointvec,
499 },
500 {
501 .procname = "tcp_workaround_signed_windows",
502 .data = &sysctl_tcp_workaround_signed_windows,
503 .maxlen = sizeof(int),
504 .mode = 0644,
505 .proc_handler = proc_dointvec
506 },
507 #ifdef CONFIG_NET_DMA
508 {
509 .procname = "tcp_dma_copybreak",
510 .data = &sysctl_tcp_dma_copybreak,
511 .maxlen = sizeof(int),
512 .mode = 0644,
513 .proc_handler = proc_dointvec
514 },
515 #endif
516 {
517 .procname = "tcp_slow_start_after_idle",
518 .data = &sysctl_tcp_slow_start_after_idle,
519 .maxlen = sizeof(int),
520 .mode = 0644,
521 .proc_handler = proc_dointvec
522 },
523 #ifdef CONFIG_NETLABEL
524 {
525 .procname = "cipso_cache_enable",
526 .data = &cipso_v4_cache_enabled,
527 .maxlen = sizeof(int),
528 .mode = 0644,
529 .proc_handler = proc_dointvec,
530 },
531 {
532 .procname = "cipso_cache_bucket_size",
533 .data = &cipso_v4_cache_bucketsize,
534 .maxlen = sizeof(int),
535 .mode = 0644,
536 .proc_handler = proc_dointvec,
537 },
538 {
539 .procname = "cipso_rbm_optfmt",
540 .data = &cipso_v4_rbm_optfmt,
541 .maxlen = sizeof(int),
542 .mode = 0644,
543 .proc_handler = proc_dointvec,
544 },
545 {
546 .procname = "cipso_rbm_strictvalid",
547 .data = &cipso_v4_rbm_strictvalid,
548 .maxlen = sizeof(int),
549 .mode = 0644,
550 .proc_handler = proc_dointvec,
551 },
552 #endif /* CONFIG_NETLABEL */
553 {
554 .procname = "tcp_available_congestion_control",
555 .maxlen = TCP_CA_BUF_MAX,
556 .mode = 0444,
557 .proc_handler = proc_tcp_available_congestion_control,
558 },
559 {
560 .procname = "tcp_allowed_congestion_control",
561 .maxlen = TCP_CA_BUF_MAX,
562 .mode = 0644,
563 .proc_handler = proc_allowed_congestion_control,
564 },
565 {
566 .procname = "tcp_max_ssthresh",
567 .data = &sysctl_tcp_max_ssthresh,
568 .maxlen = sizeof(int),
569 .mode = 0644,
570 .proc_handler = proc_dointvec,
571 },
572 {
573 .procname = "tcp_cookie_size",
574 .data = &sysctl_tcp_cookie_size,
575 .maxlen = sizeof(int),
576 .mode = 0644,
577 .proc_handler = proc_dointvec
578 },
579 {
580 .procname = "tcp_thin_linear_timeouts",
581 .data = &sysctl_tcp_thin_linear_timeouts,
582 .maxlen = sizeof(int),
583 .mode = 0644,
584 .proc_handler = proc_dointvec
585 },
586 {
587 .procname = "tcp_thin_dupack",
588 .data = &sysctl_tcp_thin_dupack,
589 .maxlen = sizeof(int),
590 .mode = 0644,
591 .proc_handler = proc_dointvec
592 },
593 {
594 .procname = "udp_mem",
595 .data = &sysctl_udp_mem,
596 .maxlen = sizeof(sysctl_udp_mem),
597 .mode = 0644,
598 .proc_handler = proc_dointvec_minmax,
599 .extra1 = &zero
600 },
601 {
602 .procname = "udp_rmem_min",
603 .data = &sysctl_udp_rmem_min,
604 .maxlen = sizeof(sysctl_udp_rmem_min),
605 .mode = 0644,
606 .proc_handler = proc_dointvec_minmax,
607 .extra1 = &zero
608 },
609 {
610 .procname = "udp_wmem_min",
611 .data = &sysctl_udp_wmem_min,
612 .maxlen = sizeof(sysctl_udp_wmem_min),
613 .mode = 0644,
614 .proc_handler = proc_dointvec_minmax,
615 .extra1 = &zero
616 },
617 { }
618 };
619
620 static struct ctl_table ipv4_net_table[] = {
621 {
622 .procname = "icmp_echo_ignore_all",
623 .data = &init_net.ipv4.sysctl_icmp_echo_ignore_all,
624 .maxlen = sizeof(int),
625 .mode = 0644,
626 .proc_handler = proc_dointvec
627 },
628 {
629 .procname = "icmp_echo_ignore_broadcasts",
630 .data = &init_net.ipv4.sysctl_icmp_echo_ignore_broadcasts,
631 .maxlen = sizeof(int),
632 .mode = 0644,
633 .proc_handler = proc_dointvec
634 },
635 {
636 .procname = "icmp_ignore_bogus_error_responses",
637 .data = &init_net.ipv4.sysctl_icmp_ignore_bogus_error_responses,
638 .maxlen = sizeof(int),
639 .mode = 0644,
640 .proc_handler = proc_dointvec
641 },
642 {
643 .procname = "icmp_errors_use_inbound_ifaddr",
644 .data = &init_net.ipv4.sysctl_icmp_errors_use_inbound_ifaddr,
645 .maxlen = sizeof(int),
646 .mode = 0644,
647 .proc_handler = proc_dointvec
648 },
649 {
650 .procname = "icmp_ratelimit",
651 .data = &init_net.ipv4.sysctl_icmp_ratelimit,
652 .maxlen = sizeof(int),
653 .mode = 0644,
654 .proc_handler = proc_dointvec_ms_jiffies,
655 },
656 {
657 .procname = "icmp_ratemask",
658 .data = &init_net.ipv4.sysctl_icmp_ratemask,
659 .maxlen = sizeof(int),
660 .mode = 0644,
661 .proc_handler = proc_dointvec
662 },
663 {
664 .procname = "rt_cache_rebuild_count",
665 .data = &init_net.ipv4.sysctl_rt_cache_rebuild_count,
666 .maxlen = sizeof(int),
667 .mode = 0644,
668 .proc_handler = proc_dointvec
669 },
670 { }
671 };
672
673 struct ctl_path net_ipv4_ctl_path[] = {
674 { .procname = "net", },
675 { .procname = "ipv4", },
676 { },
677 };
678 EXPORT_SYMBOL_GPL(net_ipv4_ctl_path);
679
680 static __net_init int ipv4_sysctl_init_net(struct net *net)
681 {
682 struct ctl_table *table;
683
684 table = ipv4_net_table;
685 if (!net_eq(net, &init_net)) {
686 table = kmemdup(table, sizeof(ipv4_net_table), GFP_KERNEL);
687 if (table == NULL)
688 goto err_alloc;
689
690 table[0].data =
691 &net->ipv4.sysctl_icmp_echo_ignore_all;
692 table[1].data =
693 &net->ipv4.sysctl_icmp_echo_ignore_broadcasts;
694 table[2].data =
695 &net->ipv4.sysctl_icmp_ignore_bogus_error_responses;
696 table[3].data =
697 &net->ipv4.sysctl_icmp_errors_use_inbound_ifaddr;
698 table[4].data =
699 &net->ipv4.sysctl_icmp_ratelimit;
700 table[5].data =
701 &net->ipv4.sysctl_icmp_ratemask;
702 table[6].data =
703 &net->ipv4.sysctl_rt_cache_rebuild_count;
704 }
705
706 net->ipv4.sysctl_rt_cache_rebuild_count = 4;
707
708 net->ipv4.ipv4_hdr = register_net_sysctl_table(net,
709 net_ipv4_ctl_path, table);
710 if (net->ipv4.ipv4_hdr == NULL)
711 goto err_reg;
712
713 return 0;
714
715 err_reg:
716 if (!net_eq(net, &init_net))
717 kfree(table);
718 err_alloc:
719 return -ENOMEM;
720 }
721
722 static __net_exit void ipv4_sysctl_exit_net(struct net *net)
723 {
724 struct ctl_table *table;
725
726 table = net->ipv4.ipv4_hdr->ctl_table_arg;
727 unregister_net_sysctl_table(net->ipv4.ipv4_hdr);
728 kfree(table);
729 }
730
731 static __net_initdata struct pernet_operations ipv4_sysctl_ops = {
732 .init = ipv4_sysctl_init_net,
733 .exit = ipv4_sysctl_exit_net,
734 };
735
736 static __init int sysctl_ipv4_init(void)
737 {
738 struct ctl_table_header *hdr;
739
740 hdr = register_sysctl_paths(net_ipv4_ctl_path, ipv4_table);
741 if (hdr == NULL)
742 return -ENOMEM;
743
744 if (register_pernet_subsys(&ipv4_sysctl_ops)) {
745 unregister_sysctl_table(hdr);
746 return -ENOMEM;
747 }
748
749 return 0;
750 }
751
752 __initcall(sysctl_ipv4_init);
Mirror https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git