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perf bench, x86: Add alternatives-asm.h wrapper
[linux-2.6/linux-acpi-2.6/ibm-acpi-2.6.git] / net / ipv4 / sysctl_net_ipv4.c
blob321e6e84dbccb93e08741263815aaae82610b0a8
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 {
315 .procname = "igmp_max_memberships",
316 .data = &sysctl_igmp_max_memberships,
317 .maxlen = sizeof(int),
318 .mode = 0644,
319 .proc_handler = proc_dointvec
320 },
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
630 static 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
683 struct ctl_path net_ipv4_ctl_path[] = {
684 { .procname = "net", },
685 { .procname = "ipv4", },
686 { },
687 };
688 EXPORT_SYMBOL_GPL(net_ipv4_ctl_path);
689
690 static __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
725 err_reg:
726 if (!net_eq(net, &init_net))
727 kfree(table);
728 err_alloc:
729 return -ENOMEM;
730 }
731
732 static __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
741 static __net_initdata struct pernet_operations ipv4_sysctl_ops = {
742 .init = ipv4_sysctl_init_net,
743 .exit = ipv4_sysctl_exit_net,
744 };
745
746 static __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);
Linux 2.6 ibm-acpi/thinkpad-acpi driver git tree