tjh.dev
Linux kernel mirror (for testing)
git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git
kernel
os
linux
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
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 };
29static int tcp_adv_win_scale_min = -31;
30static int tcp_adv_win_scale_max = 31;
31
32/* Update system visible IP port range */
33static void set_local_port_range(int range[2])
34{
35 write_seqlock(&sysctl_local_ports.lock);
36 sysctl_local_ports.range[0] = range[0];
37 sysctl_local_ports.range[1] = range[1];
38 write_sequnlock(&sysctl_local_ports.lock);
39}
40
41/* Validate changes from /proc interface. */
42static int ipv4_local_port_range(ctl_table *table, int write,
43 void __user *buffer,
44 size_t *lenp, loff_t *ppos)
45{
46 int ret;
47 int range[2];
48 ctl_table tmp = {
49 .data = &range,
50 .maxlen = sizeof(range),
51 .mode = table->mode,
52 .extra1 = &ip_local_port_range_min,
53 .extra2 = &ip_local_port_range_max,
54 };
55
56 inet_get_local_port_range(range, range + 1);
57 ret = proc_dointvec_minmax(&tmp, write, buffer, lenp, ppos);
58
59 if (write && ret == 0) {
60 if (range[1] < range[0])
61 ret = -EINVAL;
62 else
63 set_local_port_range(range);
64 }
65
66 return ret;
67}
68
69static int proc_tcp_congestion_control(ctl_table *ctl, int write,
70 void __user *buffer, size_t *lenp, loff_t *ppos)
71{
72 char val[TCP_CA_NAME_MAX];
73 ctl_table tbl = {
74 .data = val,
75 .maxlen = TCP_CA_NAME_MAX,
76 };
77 int ret;
78
79 tcp_get_default_congestion_control(val);
80
81 ret = proc_dostring(&tbl, write, buffer, lenp, ppos);
82 if (write && ret == 0)
83 ret = tcp_set_default_congestion_control(val);
84 return ret;
85}
86
87static int proc_tcp_available_congestion_control(ctl_table *ctl,
88 int write,
89 void __user *buffer, size_t *lenp,
90 loff_t *ppos)
91{
92 ctl_table tbl = { .maxlen = TCP_CA_BUF_MAX, };
93 int ret;
94
95 tbl.data = kmalloc(tbl.maxlen, GFP_USER);
96 if (!tbl.data)
97 return -ENOMEM;
98 tcp_get_available_congestion_control(tbl.data, TCP_CA_BUF_MAX);
99 ret = proc_dostring(&tbl, write, buffer, lenp, ppos);
100 kfree(tbl.data);
101 return ret;
102}
103
104static int proc_allowed_congestion_control(ctl_table *ctl,
105 int write,
106 void __user *buffer, size_t *lenp,
107 loff_t *ppos)
108{
109 ctl_table tbl = { .maxlen = TCP_CA_BUF_MAX };
110 int ret;
111
112 tbl.data = kmalloc(tbl.maxlen, GFP_USER);
113 if (!tbl.data)
114 return -ENOMEM;
115
116 tcp_get_allowed_congestion_control(tbl.data, tbl.maxlen);
117 ret = proc_dostring(&tbl, write, buffer, lenp, ppos);
118 if (write && ret == 0)
119 ret = tcp_set_allowed_congestion_control(tbl.data);
120 kfree(tbl.data);
121 return ret;
122}
123
124static struct ctl_table ipv4_table[] = {
125 {
126 .procname = "tcp_timestamps",
127 .data = &sysctl_tcp_timestamps,
128 .maxlen = sizeof(int),
129 .mode = 0644,
130 .proc_handler = proc_dointvec
131 },
132 {
133 .procname = "tcp_window_scaling",
134 .data = &sysctl_tcp_window_scaling,
135 .maxlen = sizeof(int),
136 .mode = 0644,
137 .proc_handler = proc_dointvec
138 },
139 {
140 .procname = "tcp_sack",
141 .data = &sysctl_tcp_sack,
142 .maxlen = sizeof(int),
143 .mode = 0644,
144 .proc_handler = proc_dointvec
145 },
146 {
147 .procname = "tcp_retrans_collapse",
148 .data = &sysctl_tcp_retrans_collapse,
149 .maxlen = sizeof(int),
150 .mode = 0644,
151 .proc_handler = proc_dointvec
152 },
153 {
154 .procname = "ip_default_ttl",
155 .data = &sysctl_ip_default_ttl,
156 .maxlen = sizeof(int),
157 .mode = 0644,
158 .proc_handler = ipv4_doint_and_flush,
159 .extra2 = &init_net,
160 },
161 {
162 .procname = "ip_no_pmtu_disc",
163 .data = &ipv4_config.no_pmtu_disc,
164 .maxlen = sizeof(int),
165 .mode = 0644,
166 .proc_handler = proc_dointvec
167 },
168 {
169 .procname = "ip_nonlocal_bind",
170 .data = &sysctl_ip_nonlocal_bind,
171 .maxlen = sizeof(int),
172 .mode = 0644,
173 .proc_handler = proc_dointvec
174 },
175 {
176 .procname = "tcp_syn_retries",
177 .data = &sysctl_tcp_syn_retries,
178 .maxlen = sizeof(int),
179 .mode = 0644,
180 .proc_handler = proc_dointvec
181 },
182 {
183 .procname = "tcp_synack_retries",
184 .data = &sysctl_tcp_synack_retries,
185 .maxlen = sizeof(int),
186 .mode = 0644,
187 .proc_handler = proc_dointvec
188 },
189 {
190 .procname = "tcp_max_orphans",
191 .data = &sysctl_tcp_max_orphans,
192 .maxlen = sizeof(int),
193 .mode = 0644,
194 .proc_handler = proc_dointvec
195 },
196 {
197 .procname = "tcp_max_tw_buckets",
198 .data = &tcp_death_row.sysctl_max_tw_buckets,
199 .maxlen = sizeof(int),
200 .mode = 0644,
201 .proc_handler = proc_dointvec
202 },
203 {
204 .procname = "ip_dynaddr",
205 .data = &sysctl_ip_dynaddr,
206 .maxlen = sizeof(int),
207 .mode = 0644,
208 .proc_handler = proc_dointvec
209 },
210 {
211 .procname = "tcp_keepalive_time",
212 .data = &sysctl_tcp_keepalive_time,
213 .maxlen = sizeof(int),
214 .mode = 0644,
215 .proc_handler = proc_dointvec_jiffies,
216 },
217 {
218 .procname = "tcp_keepalive_probes",
219 .data = &sysctl_tcp_keepalive_probes,
220 .maxlen = sizeof(int),
221 .mode = 0644,
222 .proc_handler = proc_dointvec
223 },
224 {
225 .procname = "tcp_keepalive_intvl",
226 .data = &sysctl_tcp_keepalive_intvl,
227 .maxlen = sizeof(int),
228 .mode = 0644,
229 .proc_handler = proc_dointvec_jiffies,
230 },
231 {
232 .procname = "tcp_retries1",
233 .data = &sysctl_tcp_retries1,
234 .maxlen = sizeof(int),
235 .mode = 0644,
236 .proc_handler = proc_dointvec_minmax,
237 .extra2 = &tcp_retr1_max
238 },
239 {
240 .procname = "tcp_retries2",
241 .data = &sysctl_tcp_retries2,
242 .maxlen = sizeof(int),
243 .mode = 0644,
244 .proc_handler = proc_dointvec
245 },
246 {
247 .procname = "tcp_fin_timeout",
248 .data = &sysctl_tcp_fin_timeout,
249 .maxlen = sizeof(int),
250 .mode = 0644,
251 .proc_handler = proc_dointvec_jiffies,
252 },
253#ifdef CONFIG_SYN_COOKIES
254 {
255 .procname = "tcp_syncookies",
256 .data = &sysctl_tcp_syncookies,
257 .maxlen = sizeof(int),
258 .mode = 0644,
259 .proc_handler = proc_dointvec
260 },
261#endif
262 {
263 .procname = "tcp_tw_recycle",
264 .data = &tcp_death_row.sysctl_tw_recycle,
265 .maxlen = sizeof(int),
266 .mode = 0644,
267 .proc_handler = proc_dointvec
268 },
269 {
270 .procname = "tcp_abort_on_overflow",
271 .data = &sysctl_tcp_abort_on_overflow,
272 .maxlen = sizeof(int),
273 .mode = 0644,
274 .proc_handler = proc_dointvec
275 },
276 {
277 .procname = "tcp_stdurg",
278 .data = &sysctl_tcp_stdurg,
279 .maxlen = sizeof(int),
280 .mode = 0644,
281 .proc_handler = proc_dointvec
282 },
283 {
284 .procname = "tcp_rfc1337",
285 .data = &sysctl_tcp_rfc1337,
286 .maxlen = sizeof(int),
287 .mode = 0644,
288 .proc_handler = proc_dointvec
289 },
290 {
291 .procname = "tcp_max_syn_backlog",
292 .data = &sysctl_max_syn_backlog,
293 .maxlen = sizeof(int),
294 .mode = 0644,
295 .proc_handler = proc_dointvec
296 },
297 {
298 .procname = "ip_local_port_range",
299 .data = &sysctl_local_ports.range,
300 .maxlen = sizeof(sysctl_local_ports.range),
301 .mode = 0644,
302 .proc_handler = ipv4_local_port_range,
303 },
304 {
305 .procname = "ip_local_reserved_ports",
306 .data = NULL, /* initialized in sysctl_ipv4_init */
307 .maxlen = 65536,
308 .mode = 0644,
309 .proc_handler = proc_do_large_bitmap,
310 },
311#ifdef CONFIG_IP_MULTICAST
312 {
313 .procname = "igmp_max_memberships",
314 .data = &sysctl_igmp_max_memberships,
315 .maxlen = sizeof(int),
316 .mode = 0644,
317 .proc_handler = proc_dointvec
318 },
319
320#endif
321 {
322 .procname = "igmp_max_msf",
323 .data = &sysctl_igmp_max_msf,
324 .maxlen = sizeof(int),
325 .mode = 0644,
326 .proc_handler = proc_dointvec
327 },
328 {
329 .procname = "inet_peer_threshold",
330 .data = &inet_peer_threshold,
331 .maxlen = sizeof(int),
332 .mode = 0644,
333 .proc_handler = proc_dointvec
334 },
335 {
336 .procname = "inet_peer_minttl",
337 .data = &inet_peer_minttl,
338 .maxlen = sizeof(int),
339 .mode = 0644,
340 .proc_handler = proc_dointvec_jiffies,
341 },
342 {
343 .procname = "inet_peer_maxttl",
344 .data = &inet_peer_maxttl,
345 .maxlen = sizeof(int),
346 .mode = 0644,
347 .proc_handler = proc_dointvec_jiffies,
348 },
349 {
350 .procname = "inet_peer_gc_mintime",
351 .data = &inet_peer_gc_mintime,
352 .maxlen = sizeof(int),
353 .mode = 0644,
354 .proc_handler = proc_dointvec_jiffies,
355 },
356 {
357 .procname = "inet_peer_gc_maxtime",
358 .data = &inet_peer_gc_maxtime,
359 .maxlen = sizeof(int),
360 .mode = 0644,
361 .proc_handler = proc_dointvec_jiffies,
362 },
363 {
364 .procname = "tcp_orphan_retries",
365 .data = &sysctl_tcp_orphan_retries,
366 .maxlen = sizeof(int),
367 .mode = 0644,
368 .proc_handler = proc_dointvec
369 },
370 {
371 .procname = "tcp_fack",
372 .data = &sysctl_tcp_fack,
373 .maxlen = sizeof(int),
374 .mode = 0644,
375 .proc_handler = proc_dointvec
376 },
377 {
378 .procname = "tcp_reordering",
379 .data = &sysctl_tcp_reordering,
380 .maxlen = sizeof(int),
381 .mode = 0644,
382 .proc_handler = proc_dointvec
383 },
384 {
385 .procname = "tcp_ecn",
386 .data = &sysctl_tcp_ecn,
387 .maxlen = sizeof(int),
388 .mode = 0644,
389 .proc_handler = proc_dointvec
390 },
391 {
392 .procname = "tcp_dsack",
393 .data = &sysctl_tcp_dsack,
394 .maxlen = sizeof(int),
395 .mode = 0644,
396 .proc_handler = proc_dointvec
397 },
398 {
399 .procname = "tcp_mem",
400 .data = &sysctl_tcp_mem,
401 .maxlen = sizeof(sysctl_tcp_mem),
402 .mode = 0644,
403 .proc_handler = proc_doulongvec_minmax
404 },
405 {
406 .procname = "tcp_wmem",
407 .data = &sysctl_tcp_wmem,
408 .maxlen = sizeof(sysctl_tcp_wmem),
409 .mode = 0644,
410 .proc_handler = proc_dointvec
411 },
412 {
413 .procname = "tcp_rmem",
414 .data = &sysctl_tcp_rmem,
415 .maxlen = sizeof(sysctl_tcp_rmem),
416 .mode = 0644,
417 .proc_handler = proc_dointvec
418 },
419 {
420 .procname = "tcp_app_win",
421 .data = &sysctl_tcp_app_win,
422 .maxlen = sizeof(int),
423 .mode = 0644,
424 .proc_handler = proc_dointvec
425 },
426 {
427 .procname = "tcp_adv_win_scale",
428 .data = &sysctl_tcp_adv_win_scale,
429 .maxlen = sizeof(int),
430 .mode = 0644,
431 .proc_handler = proc_dointvec_minmax,
432 .extra1 = &tcp_adv_win_scale_min,
433 .extra2 = &tcp_adv_win_scale_max,
434 },
435 {
436 .procname = "tcp_tw_reuse",
437 .data = &sysctl_tcp_tw_reuse,
438 .maxlen = sizeof(int),
439 .mode = 0644,
440 .proc_handler = proc_dointvec
441 },
442 {
443 .procname = "tcp_frto",
444 .data = &sysctl_tcp_frto,
445 .maxlen = sizeof(int),
446 .mode = 0644,
447 .proc_handler = proc_dointvec
448 },
449 {
450 .procname = "tcp_frto_response",
451 .data = &sysctl_tcp_frto_response,
452 .maxlen = sizeof(int),
453 .mode = 0644,
454 .proc_handler = proc_dointvec
455 },
456 {
457 .procname = "tcp_low_latency",
458 .data = &sysctl_tcp_low_latency,
459 .maxlen = sizeof(int),
460 .mode = 0644,
461 .proc_handler = proc_dointvec
462 },
463 {
464 .procname = "tcp_no_metrics_save",
465 .data = &sysctl_tcp_nometrics_save,
466 .maxlen = sizeof(int),
467 .mode = 0644,
468 .proc_handler = proc_dointvec,
469 },
470 {
471 .procname = "tcp_moderate_rcvbuf",
472 .data = &sysctl_tcp_moderate_rcvbuf,
473 .maxlen = sizeof(int),
474 .mode = 0644,
475 .proc_handler = proc_dointvec,
476 },
477 {
478 .procname = "tcp_tso_win_divisor",
479 .data = &sysctl_tcp_tso_win_divisor,
480 .maxlen = sizeof(int),
481 .mode = 0644,
482 .proc_handler = proc_dointvec,
483 },
484 {
485 .procname = "tcp_congestion_control",
486 .mode = 0644,
487 .maxlen = TCP_CA_NAME_MAX,
488 .proc_handler = proc_tcp_congestion_control,
489 },
490 {
491 .procname = "tcp_abc",
492 .data = &sysctl_tcp_abc,
493 .maxlen = sizeof(int),
494 .mode = 0644,
495 .proc_handler = proc_dointvec,
496 },
497 {
498 .procname = "tcp_mtu_probing",
499 .data = &sysctl_tcp_mtu_probing,
500 .maxlen = sizeof(int),
501 .mode = 0644,
502 .proc_handler = proc_dointvec,
503 },
504 {
505 .procname = "tcp_base_mss",
506 .data = &sysctl_tcp_base_mss,
507 .maxlen = sizeof(int),
508 .mode = 0644,
509 .proc_handler = proc_dointvec,
510 },
511 {
512 .procname = "tcp_workaround_signed_windows",
513 .data = &sysctl_tcp_workaround_signed_windows,
514 .maxlen = sizeof(int),
515 .mode = 0644,
516 .proc_handler = proc_dointvec
517 },
518#ifdef CONFIG_NET_DMA
519 {
520 .procname = "tcp_dma_copybreak",
521 .data = &sysctl_tcp_dma_copybreak,
522 .maxlen = sizeof(int),
523 .mode = 0644,
524 .proc_handler = proc_dointvec
525 },
526#endif
527 {
528 .procname = "tcp_slow_start_after_idle",
529 .data = &sysctl_tcp_slow_start_after_idle,
530 .maxlen = sizeof(int),
531 .mode = 0644,
532 .proc_handler = proc_dointvec
533 },
534#ifdef CONFIG_NETLABEL
535 {
536 .procname = "cipso_cache_enable",
537 .data = &cipso_v4_cache_enabled,
538 .maxlen = sizeof(int),
539 .mode = 0644,
540 .proc_handler = proc_dointvec,
541 },
542 {
543 .procname = "cipso_cache_bucket_size",
544 .data = &cipso_v4_cache_bucketsize,
545 .maxlen = sizeof(int),
546 .mode = 0644,
547 .proc_handler = proc_dointvec,
548 },
549 {
550 .procname = "cipso_rbm_optfmt",
551 .data = &cipso_v4_rbm_optfmt,
552 .maxlen = sizeof(int),
553 .mode = 0644,
554 .proc_handler = proc_dointvec,
555 },
556 {
557 .procname = "cipso_rbm_strictvalid",
558 .data = &cipso_v4_rbm_strictvalid,
559 .maxlen = sizeof(int),
560 .mode = 0644,
561 .proc_handler = proc_dointvec,
562 },
563#endif /* CONFIG_NETLABEL */
564 {
565 .procname = "tcp_available_congestion_control",
566 .maxlen = TCP_CA_BUF_MAX,
567 .mode = 0444,
568 .proc_handler = proc_tcp_available_congestion_control,
569 },
570 {
571 .procname = "tcp_allowed_congestion_control",
572 .maxlen = TCP_CA_BUF_MAX,
573 .mode = 0644,
574 .proc_handler = proc_allowed_congestion_control,
575 },
576 {
577 .procname = "tcp_max_ssthresh",
578 .data = &sysctl_tcp_max_ssthresh,
579 .maxlen = sizeof(int),
580 .mode = 0644,
581 .proc_handler = proc_dointvec,
582 },
583 {
584 .procname = "tcp_cookie_size",
585 .data = &sysctl_tcp_cookie_size,
586 .maxlen = sizeof(int),
587 .mode = 0644,
588 .proc_handler = proc_dointvec
589 },
590 {
591 .procname = "tcp_thin_linear_timeouts",
592 .data = &sysctl_tcp_thin_linear_timeouts,
593 .maxlen = sizeof(int),
594 .mode = 0644,
595 .proc_handler = proc_dointvec
596 },
597 {
598 .procname = "tcp_thin_dupack",
599 .data = &sysctl_tcp_thin_dupack,
600 .maxlen = sizeof(int),
601 .mode = 0644,
602 .proc_handler = proc_dointvec
603 },
604 {
605 .procname = "udp_mem",
606 .data = &sysctl_udp_mem,
607 .maxlen = sizeof(sysctl_udp_mem),
608 .mode = 0644,
609 .proc_handler = proc_doulongvec_minmax,
610 },
611 {
612 .procname = "udp_rmem_min",
613 .data = &sysctl_udp_rmem_min,
614 .maxlen = sizeof(sysctl_udp_rmem_min),
615 .mode = 0644,
616 .proc_handler = proc_dointvec_minmax,
617 .extra1 = &zero
618 },
619 {
620 .procname = "udp_wmem_min",
621 .data = &sysctl_udp_wmem_min,
622 .maxlen = sizeof(sysctl_udp_wmem_min),
623 .mode = 0644,
624 .proc_handler = proc_dointvec_minmax,
625 .extra1 = &zero
626 },
627 { }
628};
629
630static struct ctl_table ipv4_net_table[] = {
631 {
632 .procname = "icmp_echo_ignore_all",
633 .data = &init_net.ipv4.sysctl_icmp_echo_ignore_all,
634 .maxlen = sizeof(int),
635 .mode = 0644,
636 .proc_handler = proc_dointvec
637 },
638 {
639 .procname = "icmp_echo_ignore_broadcasts",
640 .data = &init_net.ipv4.sysctl_icmp_echo_ignore_broadcasts,
641 .maxlen = sizeof(int),
642 .mode = 0644,
643 .proc_handler = proc_dointvec
644 },
645 {
646 .procname = "icmp_ignore_bogus_error_responses",
647 .data = &init_net.ipv4.sysctl_icmp_ignore_bogus_error_responses,
648 .maxlen = sizeof(int),
649 .mode = 0644,
650 .proc_handler = proc_dointvec
651 },
652 {
653 .procname = "icmp_errors_use_inbound_ifaddr",
654 .data = &init_net.ipv4.sysctl_icmp_errors_use_inbound_ifaddr,
655 .maxlen = sizeof(int),
656 .mode = 0644,
657 .proc_handler = proc_dointvec
658 },
659 {
660 .procname = "icmp_ratelimit",
661 .data = &init_net.ipv4.sysctl_icmp_ratelimit,
662 .maxlen = sizeof(int),
663 .mode = 0644,
664 .proc_handler = proc_dointvec_ms_jiffies,
665 },
666 {
667 .procname = "icmp_ratemask",
668 .data = &init_net.ipv4.sysctl_icmp_ratemask,
669 .maxlen = sizeof(int),
670 .mode = 0644,
671 .proc_handler = proc_dointvec
672 },
673 {
674 .procname = "rt_cache_rebuild_count",
675 .data = &init_net.ipv4.sysctl_rt_cache_rebuild_count,
676 .maxlen = sizeof(int),
677 .mode = 0644,
678 .proc_handler = proc_dointvec
679 },
680 { }
681};
682
683struct ctl_path net_ipv4_ctl_path[] = {
684 { .procname = "net", },
685 { .procname = "ipv4", },
686 { },
687};
688EXPORT_SYMBOL_GPL(net_ipv4_ctl_path);
689
690static __net_init int ipv4_sysctl_init_net(struct net *net)
691{
692 struct ctl_table *table;
693
694 table = ipv4_net_table;
695 if (!net_eq(net, &init_net)) {
696 table = kmemdup(table, sizeof(ipv4_net_table), GFP_KERNEL);
697 if (table == NULL)
698 goto err_alloc;
699
700 table[0].data =
701 &net->ipv4.sysctl_icmp_echo_ignore_all;
702 table[1].data =
703 &net->ipv4.sysctl_icmp_echo_ignore_broadcasts;
704 table[2].data =
705 &net->ipv4.sysctl_icmp_ignore_bogus_error_responses;
706 table[3].data =
707 &net->ipv4.sysctl_icmp_errors_use_inbound_ifaddr;
708 table[4].data =
709 &net->ipv4.sysctl_icmp_ratelimit;
710 table[5].data =
711 &net->ipv4.sysctl_icmp_ratemask;
712 table[6].data =
713 &net->ipv4.sysctl_rt_cache_rebuild_count;
714 }
715
716 net->ipv4.sysctl_rt_cache_rebuild_count = 4;
717
718 net->ipv4.ipv4_hdr = register_net_sysctl_table(net,
719 net_ipv4_ctl_path, table);
720 if (net->ipv4.ipv4_hdr == NULL)
721 goto err_reg;
722
723 return 0;
724
725err_reg:
726 if (!net_eq(net, &init_net))
727 kfree(table);
728err_alloc:
729 return -ENOMEM;
730}
731
732static __net_exit void ipv4_sysctl_exit_net(struct net *net)
733{
734 struct ctl_table *table;
735
736 table = net->ipv4.ipv4_hdr->ctl_table_arg;
737 unregister_net_sysctl_table(net->ipv4.ipv4_hdr);
738 kfree(table);
739}
740
741static __net_initdata struct pernet_operations ipv4_sysctl_ops = {
742 .init = ipv4_sysctl_init_net,
743 .exit = ipv4_sysctl_exit_net,
744};
745
746static __init int sysctl_ipv4_init(void)
747{
748 struct ctl_table_header *hdr;
749 struct ctl_table *i;
750
751 for (i = ipv4_table; i->procname; i++) {
752 if (strcmp(i->procname, "ip_local_reserved_ports") == 0) {
753 i->data = sysctl_local_reserved_ports;
754 break;
755 }
756 }
757 if (!i->procname)
758 return -EINVAL;
759
760 hdr = register_sysctl_paths(net_ipv4_ctl_path, ipv4_table);
761 if (hdr == NULL)
762 return -ENOMEM;
763
764 if (register_pernet_subsys(&ipv4_sysctl_ops)) {
765 unregister_sysctl_table(hdr);
766 return -ENOMEM;
767 }
768
769 return 0;
770}
771
772__initcall(sysctl_ipv4_init);