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mmc: SDHI should depend on SUPERH || ARCH_SHMOBILE
[cris-mirror.git] / net / ipv4 / sysctl_net_ipv4.c
blob1a456652086b7b4837b8e1035f0a96bb12eb6700
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 static int tcp_adv_win_scale_min = -31;
30 static int tcp_adv_win_scale_max = 31;
31 static int ip_ttl_min = 1;
32 static int ip_ttl_max = 255;
33
34 /* Update system visible IP port range */
35 static void set_local_port_range(int range[2])
36 {
37 write_seqlock(&sysctl_local_ports.lock);
38 sysctl_local_ports.range[0] = range[0];
39 sysctl_local_ports.range[1] = range[1];
40 write_sequnlock(&sysctl_local_ports.lock);
41 }
42
43 /* Validate changes from /proc interface. */
44 static int ipv4_local_port_range(ctl_table *table, int write,
45 void __user *buffer,
46 size_t *lenp, loff_t *ppos)
47 {
48 int ret;
49 int range[2];
50 ctl_table tmp = {
51 .data = &range,
52 .maxlen = sizeof(range),
53 .mode = table->mode,
54 .extra1 = &ip_local_port_range_min,
55 .extra2 = &ip_local_port_range_max,
56 };
57
58 inet_get_local_port_range(range, range + 1);
59 ret = proc_dointvec_minmax(&tmp, write, buffer, lenp, ppos);
60
61 if (write && ret == 0) {
62 if (range[1] < range[0])
63 ret = -EINVAL;
64 else
65 set_local_port_range(range);
66 }
67
68 return ret;
69 }
70
71 static int proc_tcp_congestion_control(ctl_table *ctl, int write,
72 void __user *buffer, size_t *lenp, loff_t *ppos)
73 {
74 char val[TCP_CA_NAME_MAX];
75 ctl_table tbl = {
76 .data = val,
77 .maxlen = TCP_CA_NAME_MAX,
78 };
79 int ret;
80
81 tcp_get_default_congestion_control(val);
82
83 ret = proc_dostring(&tbl, write, buffer, lenp, ppos);
84 if (write && ret == 0)
85 ret = tcp_set_default_congestion_control(val);
86 return ret;
87 }
88
89 static int proc_tcp_available_congestion_control(ctl_table *ctl,
90 int write,
91 void __user *buffer, size_t *lenp,
92 loff_t *ppos)
93 {
94 ctl_table tbl = { .maxlen = TCP_CA_BUF_MAX, };
95 int ret;
96
97 tbl.data = kmalloc(tbl.maxlen, GFP_USER);
98 if (!tbl.data)
99 return -ENOMEM;
100 tcp_get_available_congestion_control(tbl.data, TCP_CA_BUF_MAX);
101 ret = proc_dostring(&tbl, write, buffer, lenp, ppos);
102 kfree(tbl.data);
103 return ret;
104 }
105
106 static int proc_allowed_congestion_control(ctl_table *ctl,
107 int write,
108 void __user *buffer, size_t *lenp,
109 loff_t *ppos)
110 {
111 ctl_table tbl = { .maxlen = TCP_CA_BUF_MAX };
112 int ret;
113
114 tbl.data = kmalloc(tbl.maxlen, GFP_USER);
115 if (!tbl.data)
116 return -ENOMEM;
117
118 tcp_get_allowed_congestion_control(tbl.data, tbl.maxlen);
119 ret = proc_dostring(&tbl, write, buffer, lenp, ppos);
120 if (write && ret == 0)
121 ret = tcp_set_allowed_congestion_control(tbl.data);
122 kfree(tbl.data);
123 return ret;
124 }
125
126 static struct ctl_table ipv4_table[] = {
127 {
128 .procname = "tcp_timestamps",
129 .data = &sysctl_tcp_timestamps,
130 .maxlen = sizeof(int),
131 .mode = 0644,
132 .proc_handler = proc_dointvec
133 },
134 {
135 .procname = "tcp_window_scaling",
136 .data = &sysctl_tcp_window_scaling,
137 .maxlen = sizeof(int),
138 .mode = 0644,
139 .proc_handler = proc_dointvec
140 },
141 {
142 .procname = "tcp_sack",
143 .data = &sysctl_tcp_sack,
144 .maxlen = sizeof(int),
145 .mode = 0644,
146 .proc_handler = proc_dointvec
147 },
148 {
149 .procname = "tcp_retrans_collapse",
150 .data = &sysctl_tcp_retrans_collapse,
151 .maxlen = sizeof(int),
152 .mode = 0644,
153 .proc_handler = proc_dointvec
154 },
155 {
156 .procname = "ip_default_ttl",
157 .data = &sysctl_ip_default_ttl,
158 .maxlen = sizeof(int),
159 .mode = 0644,
160 .proc_handler = proc_dointvec_minmax,
161 .extra1 = &ip_ttl_min,
162 .extra2 = &ip_ttl_max,
163 },
164 {
165 .procname = "ip_no_pmtu_disc",
166 .data = &ipv4_config.no_pmtu_disc,
167 .maxlen = sizeof(int),
168 .mode = 0644,
169 .proc_handler = proc_dointvec
170 },
171 {
172 .procname = "ip_nonlocal_bind",
173 .data = &sysctl_ip_nonlocal_bind,
174 .maxlen = sizeof(int),
175 .mode = 0644,
176 .proc_handler = proc_dointvec
177 },
178 {
179 .procname = "tcp_syn_retries",
180 .data = &sysctl_tcp_syn_retries,
181 .maxlen = sizeof(int),
182 .mode = 0644,
183 .proc_handler = proc_dointvec
184 },
185 {
186 .procname = "tcp_synack_retries",
187 .data = &sysctl_tcp_synack_retries,
188 .maxlen = sizeof(int),
189 .mode = 0644,
190 .proc_handler = proc_dointvec
191 },
192 {
193 .procname = "tcp_max_orphans",
194 .data = &sysctl_tcp_max_orphans,
195 .maxlen = sizeof(int),
196 .mode = 0644,
197 .proc_handler = proc_dointvec
198 },
199 {
200 .procname = "tcp_max_tw_buckets",
201 .data = &tcp_death_row.sysctl_max_tw_buckets,
202 .maxlen = sizeof(int),
203 .mode = 0644,
204 .proc_handler = proc_dointvec
205 },
206 {
207 .procname = "ip_dynaddr",
208 .data = &sysctl_ip_dynaddr,
209 .maxlen = sizeof(int),
210 .mode = 0644,
211 .proc_handler = proc_dointvec
212 },
213 {
214 .procname = "tcp_keepalive_time",
215 .data = &sysctl_tcp_keepalive_time,
216 .maxlen = sizeof(int),
217 .mode = 0644,
218 .proc_handler = proc_dointvec_jiffies,
219 },
220 {
221 .procname = "tcp_keepalive_probes",
222 .data = &sysctl_tcp_keepalive_probes,
223 .maxlen = sizeof(int),
224 .mode = 0644,
225 .proc_handler = proc_dointvec
226 },
227 {
228 .procname = "tcp_keepalive_intvl",
229 .data = &sysctl_tcp_keepalive_intvl,
230 .maxlen = sizeof(int),
231 .mode = 0644,
232 .proc_handler = proc_dointvec_jiffies,
233 },
234 {
235 .procname = "tcp_retries1",
236 .data = &sysctl_tcp_retries1,
237 .maxlen = sizeof(int),
238 .mode = 0644,
239 .proc_handler = proc_dointvec_minmax,
240 .extra2 = &tcp_retr1_max
241 },
242 {
243 .procname = "tcp_retries2",
244 .data = &sysctl_tcp_retries2,
245 .maxlen = sizeof(int),
246 .mode = 0644,
247 .proc_handler = proc_dointvec
248 },
249 {
250 .procname = "tcp_fin_timeout",
251 .data = &sysctl_tcp_fin_timeout,
252 .maxlen = sizeof(int),
253 .mode = 0644,
254 .proc_handler = proc_dointvec_jiffies,
255 },
256 #ifdef CONFIG_SYN_COOKIES
257 {
258 .procname = "tcp_syncookies",
259 .data = &sysctl_tcp_syncookies,
260 .maxlen = sizeof(int),
261 .mode = 0644,
262 .proc_handler = proc_dointvec
263 },
264 #endif
265 {
266 .procname = "tcp_tw_recycle",
267 .data = &tcp_death_row.sysctl_tw_recycle,
268 .maxlen = sizeof(int),
269 .mode = 0644,
270 .proc_handler = proc_dointvec
271 },
272 {
273 .procname = "tcp_abort_on_overflow",
274 .data = &sysctl_tcp_abort_on_overflow,
275 .maxlen = sizeof(int),
276 .mode = 0644,
277 .proc_handler = proc_dointvec
278 },
279 {
280 .procname = "tcp_stdurg",
281 .data = &sysctl_tcp_stdurg,
282 .maxlen = sizeof(int),
283 .mode = 0644,
284 .proc_handler = proc_dointvec
285 },
286 {
287 .procname = "tcp_rfc1337",
288 .data = &sysctl_tcp_rfc1337,
289 .maxlen = sizeof(int),
290 .mode = 0644,
291 .proc_handler = proc_dointvec
292 },
293 {
294 .procname = "tcp_max_syn_backlog",
295 .data = &sysctl_max_syn_backlog,
296 .maxlen = sizeof(int),
297 .mode = 0644,
298 .proc_handler = proc_dointvec
299 },
300 {
301 .procname = "ip_local_port_range",
302 .data = &sysctl_local_ports.range,
303 .maxlen = sizeof(sysctl_local_ports.range),
304 .mode = 0644,
305 .proc_handler = ipv4_local_port_range,
306 },
307 {
308 .procname = "ip_local_reserved_ports",
309 .data = NULL, /* initialized in sysctl_ipv4_init */
310 .maxlen = 65536,
311 .mode = 0644,
312 .proc_handler = proc_do_large_bitmap,
313 },
314 #ifdef CONFIG_IP_MULTICAST
315 {
316 .procname = "igmp_max_memberships",
317 .data = &sysctl_igmp_max_memberships,
318 .maxlen = sizeof(int),
319 .mode = 0644,
320 .proc_handler = proc_dointvec
321 },
322
323 #endif
324 {
325 .procname = "igmp_max_msf",
326 .data = &sysctl_igmp_max_msf,
327 .maxlen = sizeof(int),
328 .mode = 0644,
329 .proc_handler = proc_dointvec
330 },
331 {
332 .procname = "inet_peer_threshold",
333 .data = &inet_peer_threshold,
334 .maxlen = sizeof(int),
335 .mode = 0644,
336 .proc_handler = proc_dointvec
337 },
338 {
339 .procname = "inet_peer_minttl",
340 .data = &inet_peer_minttl,
341 .maxlen = sizeof(int),
342 .mode = 0644,
343 .proc_handler = proc_dointvec_jiffies,
344 },
345 {
346 .procname = "inet_peer_maxttl",
347 .data = &inet_peer_maxttl,
348 .maxlen = sizeof(int),
349 .mode = 0644,
350 .proc_handler = proc_dointvec_jiffies,
351 },
352 {
353 .procname = "inet_peer_gc_mintime",
354 .data = &inet_peer_gc_mintime,
355 .maxlen = sizeof(int),
356 .mode = 0644,
357 .proc_handler = proc_dointvec_jiffies,
358 },
359 {
360 .procname = "inet_peer_gc_maxtime",
361 .data = &inet_peer_gc_maxtime,
362 .maxlen = sizeof(int),
363 .mode = 0644,
364 .proc_handler = proc_dointvec_jiffies,
365 },
366 {
367 .procname = "tcp_orphan_retries",
368 .data = &sysctl_tcp_orphan_retries,
369 .maxlen = sizeof(int),
370 .mode = 0644,
371 .proc_handler = proc_dointvec
372 },
373 {
374 .procname = "tcp_fack",
375 .data = &sysctl_tcp_fack,
376 .maxlen = sizeof(int),
377 .mode = 0644,
378 .proc_handler = proc_dointvec
379 },
380 {
381 .procname = "tcp_reordering",
382 .data = &sysctl_tcp_reordering,
383 .maxlen = sizeof(int),
384 .mode = 0644,
385 .proc_handler = proc_dointvec
386 },
387 {
388 .procname = "tcp_ecn",
389 .data = &sysctl_tcp_ecn,
390 .maxlen = sizeof(int),
391 .mode = 0644,
392 .proc_handler = proc_dointvec
393 },
394 {
395 .procname = "tcp_dsack",
396 .data = &sysctl_tcp_dsack,
397 .maxlen = sizeof(int),
398 .mode = 0644,
399 .proc_handler = proc_dointvec
400 },
401 {
402 .procname = "tcp_mem",
403 .data = &sysctl_tcp_mem,
404 .maxlen = sizeof(sysctl_tcp_mem),
405 .mode = 0644,
406 .proc_handler = proc_doulongvec_minmax
407 },
408 {
409 .procname = "tcp_wmem",
410 .data = &sysctl_tcp_wmem,
411 .maxlen = sizeof(sysctl_tcp_wmem),
412 .mode = 0644,
413 .proc_handler = proc_dointvec
414 },
415 {
416 .procname = "tcp_rmem",
417 .data = &sysctl_tcp_rmem,
418 .maxlen = sizeof(sysctl_tcp_rmem),
419 .mode = 0644,
420 .proc_handler = proc_dointvec
421 },
422 {
423 .procname = "tcp_app_win",
424 .data = &sysctl_tcp_app_win,
425 .maxlen = sizeof(int),
426 .mode = 0644,
427 .proc_handler = proc_dointvec
428 },
429 {
430 .procname = "tcp_adv_win_scale",
431 .data = &sysctl_tcp_adv_win_scale,
432 .maxlen = sizeof(int),
433 .mode = 0644,
434 .proc_handler = proc_dointvec_minmax,
435 .extra1 = &tcp_adv_win_scale_min,
436 .extra2 = &tcp_adv_win_scale_max,
437 },
438 {
439 .procname = "tcp_tw_reuse",
440 .data = &sysctl_tcp_tw_reuse,
441 .maxlen = sizeof(int),
442 .mode = 0644,
443 .proc_handler = proc_dointvec
444 },
445 {
446 .procname = "tcp_frto",
447 .data = &sysctl_tcp_frto,
448 .maxlen = sizeof(int),
449 .mode = 0644,
450 .proc_handler = proc_dointvec
451 },
452 {
453 .procname = "tcp_frto_response",
454 .data = &sysctl_tcp_frto_response,
455 .maxlen = sizeof(int),
456 .mode = 0644,
457 .proc_handler = proc_dointvec
458 },
459 {
460 .procname = "tcp_low_latency",
461 .data = &sysctl_tcp_low_latency,
462 .maxlen = sizeof(int),
463 .mode = 0644,
464 .proc_handler = proc_dointvec
465 },
466 {
467 .procname = "tcp_no_metrics_save",
468 .data = &sysctl_tcp_nometrics_save,
469 .maxlen = sizeof(int),
470 .mode = 0644,
471 .proc_handler = proc_dointvec,
472 },
473 {
474 .procname = "tcp_moderate_rcvbuf",
475 .data = &sysctl_tcp_moderate_rcvbuf,
476 .maxlen = sizeof(int),
477 .mode = 0644,
478 .proc_handler = proc_dointvec,
479 },
480 {
481 .procname = "tcp_tso_win_divisor",
482 .data = &sysctl_tcp_tso_win_divisor,
483 .maxlen = sizeof(int),
484 .mode = 0644,
485 .proc_handler = proc_dointvec,
486 },
487 {
488 .procname = "tcp_congestion_control",
489 .mode = 0644,
490 .maxlen = TCP_CA_NAME_MAX,
491 .proc_handler = proc_tcp_congestion_control,
492 },
493 {
494 .procname = "tcp_abc",
495 .data = &sysctl_tcp_abc,
496 .maxlen = sizeof(int),
497 .mode = 0644,
498 .proc_handler = proc_dointvec,
499 },
500 {
501 .procname = "tcp_mtu_probing",
502 .data = &sysctl_tcp_mtu_probing,
503 .maxlen = sizeof(int),
504 .mode = 0644,
505 .proc_handler = proc_dointvec,
506 },
507 {
508 .procname = "tcp_base_mss",
509 .data = &sysctl_tcp_base_mss,
510 .maxlen = sizeof(int),
511 .mode = 0644,
512 .proc_handler = proc_dointvec,
513 },
514 {
515 .procname = "tcp_workaround_signed_windows",
516 .data = &sysctl_tcp_workaround_signed_windows,
517 .maxlen = sizeof(int),
518 .mode = 0644,
519 .proc_handler = proc_dointvec
520 },
521 #ifdef CONFIG_NET_DMA
522 {
523 .procname = "tcp_dma_copybreak",
524 .data = &sysctl_tcp_dma_copybreak,
525 .maxlen = sizeof(int),
526 .mode = 0644,
527 .proc_handler = proc_dointvec
528 },
529 #endif
530 {
531 .procname = "tcp_slow_start_after_idle",
532 .data = &sysctl_tcp_slow_start_after_idle,
533 .maxlen = sizeof(int),
534 .mode = 0644,
535 .proc_handler = proc_dointvec
536 },
537 #ifdef CONFIG_NETLABEL
538 {
539 .procname = "cipso_cache_enable",
540 .data = &cipso_v4_cache_enabled,
541 .maxlen = sizeof(int),
542 .mode = 0644,
543 .proc_handler = proc_dointvec,
544 },
545 {
546 .procname = "cipso_cache_bucket_size",
547 .data = &cipso_v4_cache_bucketsize,
548 .maxlen = sizeof(int),
549 .mode = 0644,
550 .proc_handler = proc_dointvec,
551 },
552 {
553 .procname = "cipso_rbm_optfmt",
554 .data = &cipso_v4_rbm_optfmt,
555 .maxlen = sizeof(int),
556 .mode = 0644,
557 .proc_handler = proc_dointvec,
558 },
559 {
560 .procname = "cipso_rbm_strictvalid",
561 .data = &cipso_v4_rbm_strictvalid,
562 .maxlen = sizeof(int),
563 .mode = 0644,
564 .proc_handler = proc_dointvec,
565 },
566 #endif /* CONFIG_NETLABEL */
567 {
568 .procname = "tcp_available_congestion_control",
569 .maxlen = TCP_CA_BUF_MAX,
570 .mode = 0444,
571 .proc_handler = proc_tcp_available_congestion_control,
572 },
573 {
574 .procname = "tcp_allowed_congestion_control",
575 .maxlen = TCP_CA_BUF_MAX,
576 .mode = 0644,
577 .proc_handler = proc_allowed_congestion_control,
578 },
579 {
580 .procname = "tcp_max_ssthresh",
581 .data = &sysctl_tcp_max_ssthresh,
582 .maxlen = sizeof(int),
583 .mode = 0644,
584 .proc_handler = proc_dointvec,
585 },
586 {
587 .procname = "tcp_cookie_size",
588 .data = &sysctl_tcp_cookie_size,
589 .maxlen = sizeof(int),
590 .mode = 0644,
591 .proc_handler = proc_dointvec
592 },
593 {
594 .procname = "tcp_thin_linear_timeouts",
595 .data = &sysctl_tcp_thin_linear_timeouts,
596 .maxlen = sizeof(int),
597 .mode = 0644,
598 .proc_handler = proc_dointvec
599 },
600 {
601 .procname = "tcp_thin_dupack",
602 .data = &sysctl_tcp_thin_dupack,
603 .maxlen = sizeof(int),
604 .mode = 0644,
605 .proc_handler = proc_dointvec
606 },
607 {
608 .procname = "udp_mem",
609 .data = &sysctl_udp_mem,
610 .maxlen = sizeof(sysctl_udp_mem),
611 .mode = 0644,
612 .proc_handler = proc_doulongvec_minmax,
613 },
614 {
615 .procname = "udp_rmem_min",
616 .data = &sysctl_udp_rmem_min,
617 .maxlen = sizeof(sysctl_udp_rmem_min),
618 .mode = 0644,
619 .proc_handler = proc_dointvec_minmax,
620 .extra1 = &zero
621 },
622 {
623 .procname = "udp_wmem_min",
624 .data = &sysctl_udp_wmem_min,
625 .maxlen = sizeof(sysctl_udp_wmem_min),
626 .mode = 0644,
627 .proc_handler = proc_dointvec_minmax,
628 .extra1 = &zero
629 },
630 { }
631 };
632
633 static struct ctl_table ipv4_net_table[] = {
634 {
635 .procname = "icmp_echo_ignore_all",
636 .data = &init_net.ipv4.sysctl_icmp_echo_ignore_all,
637 .maxlen = sizeof(int),
638 .mode = 0644,
639 .proc_handler = proc_dointvec
640 },
641 {
642 .procname = "icmp_echo_ignore_broadcasts",
643 .data = &init_net.ipv4.sysctl_icmp_echo_ignore_broadcasts,
644 .maxlen = sizeof(int),
645 .mode = 0644,
646 .proc_handler = proc_dointvec
647 },
648 {
649 .procname = "icmp_ignore_bogus_error_responses",
650 .data = &init_net.ipv4.sysctl_icmp_ignore_bogus_error_responses,
651 .maxlen = sizeof(int),
652 .mode = 0644,
653 .proc_handler = proc_dointvec
654 },
655 {
656 .procname = "icmp_errors_use_inbound_ifaddr",
657 .data = &init_net.ipv4.sysctl_icmp_errors_use_inbound_ifaddr,
658 .maxlen = sizeof(int),
659 .mode = 0644,
660 .proc_handler = proc_dointvec
661 },
662 {
663 .procname = "icmp_ratelimit",
664 .data = &init_net.ipv4.sysctl_icmp_ratelimit,
665 .maxlen = sizeof(int),
666 .mode = 0644,
667 .proc_handler = proc_dointvec_ms_jiffies,
668 },
669 {
670 .procname = "icmp_ratemask",
671 .data = &init_net.ipv4.sysctl_icmp_ratemask,
672 .maxlen = sizeof(int),
673 .mode = 0644,
674 .proc_handler = proc_dointvec
675 },
676 {
677 .procname = "rt_cache_rebuild_count",
678 .data = &init_net.ipv4.sysctl_rt_cache_rebuild_count,
679 .maxlen = sizeof(int),
680 .mode = 0644,
681 .proc_handler = proc_dointvec
682 },
683 { }
684 };
685
686 struct ctl_path net_ipv4_ctl_path[] = {
687 { .procname = "net", },
688 { .procname = "ipv4", },
689 { },
690 };
691 EXPORT_SYMBOL_GPL(net_ipv4_ctl_path);
692
693 static __net_init int ipv4_sysctl_init_net(struct net *net)
694 {
695 struct ctl_table *table;
696
697 table = ipv4_net_table;
698 if (!net_eq(net, &init_net)) {
699 table = kmemdup(table, sizeof(ipv4_net_table), GFP_KERNEL);
700 if (table == NULL)
701 goto err_alloc;
702
703 table[0].data =
704 &net->ipv4.sysctl_icmp_echo_ignore_all;
705 table[1].data =
706 &net->ipv4.sysctl_icmp_echo_ignore_broadcasts;
707 table[2].data =
708 &net->ipv4.sysctl_icmp_ignore_bogus_error_responses;
709 table[3].data =
710 &net->ipv4.sysctl_icmp_errors_use_inbound_ifaddr;
711 table[4].data =
712 &net->ipv4.sysctl_icmp_ratelimit;
713 table[5].data =
714 &net->ipv4.sysctl_icmp_ratemask;
715 table[6].data =
716 &net->ipv4.sysctl_rt_cache_rebuild_count;
717 }
718
719 net->ipv4.sysctl_rt_cache_rebuild_count = 4;
720
721 net->ipv4.ipv4_hdr = register_net_sysctl_table(net,
722 net_ipv4_ctl_path, table);
723 if (net->ipv4.ipv4_hdr == NULL)
724 goto err_reg;
725
726 return 0;
727
728 err_reg:
729 if (!net_eq(net, &init_net))
730 kfree(table);
731 err_alloc:
732 return -ENOMEM;
733 }
734
735 static __net_exit void ipv4_sysctl_exit_net(struct net *net)
736 {
737 struct ctl_table *table;
738
739 table = net->ipv4.ipv4_hdr->ctl_table_arg;
740 unregister_net_sysctl_table(net->ipv4.ipv4_hdr);
741 kfree(table);
742 }
743
744 static __net_initdata struct pernet_operations ipv4_sysctl_ops = {
745 .init = ipv4_sysctl_init_net,
746 .exit = ipv4_sysctl_exit_net,
747 };
748
749 static __init int sysctl_ipv4_init(void)
750 {
751 struct ctl_table_header *hdr;
752 struct ctl_table *i;
753
754 for (i = ipv4_table; i->procname; i++) {
755 if (strcmp(i->procname, "ip_local_reserved_ports") == 0) {
756 i->data = sysctl_local_reserved_ports;
757 break;
758 }
759 }
760 if (!i->procname)
761 return -EINVAL;
762
763 hdr = register_sysctl_paths(net_ipv4_ctl_path, ipv4_table);
764 if (hdr == NULL)
765 return -ENOMEM;
766
767 if (register_pernet_subsys(&ipv4_sysctl_ops)) {
768 unregister_sysctl_table(hdr);
769 return -ENOMEM;
770 }
771
772 return 0;
773 }
774
775 __initcall(sysctl_ipv4_init);
CRIS linux kernel tree