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Merge tag 'locks-v3.16-2' of git://git.samba.org/jlayton/linux
[linux/fpc-iii.git] / net / ipv4 / sysctl_net_ipv4.c
blob79a007c5255883f9d96011682c67ea8aac15a835
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 <linux/swap.h>
18 #include <net/snmp.h>
19 #include <net/icmp.h>
20 #include <net/ip.h>
21 #include <net/route.h>
22 #include <net/tcp.h>
23 #include <net/udp.h>
24 #include <net/cipso_ipv4.h>
25 #include <net/inet_frag.h>
26 #include <net/ping.h>
27 #include <net/tcp_memcontrol.h>
28
29 static int zero;
30 static int one = 1;
31 static int four = 4;
32 static int gso_max_segs = GSO_MAX_SEGS;
33 static int tcp_retr1_max = 255;
34 static int ip_local_port_range_min[] = { 1, 1 };
35 static int ip_local_port_range_max[] = { 65535, 65535 };
36 static int tcp_adv_win_scale_min = -31;
37 static int tcp_adv_win_scale_max = 31;
38 static int ip_ttl_min = 1;
39 static int ip_ttl_max = 255;
40 static int tcp_syn_retries_min = 1;
41 static int tcp_syn_retries_max = MAX_TCP_SYNCNT;
42 static int ip_ping_group_range_min[] = { 0, 0 };
43 static int ip_ping_group_range_max[] = { GID_T_MAX, GID_T_MAX };
44
45 /* Update system visible IP port range */
46 static void set_local_port_range(struct net *net, int range[2])
47 {
48 write_seqlock(&net->ipv4.ip_local_ports.lock);
49 net->ipv4.ip_local_ports.range[0] = range[0];
50 net->ipv4.ip_local_ports.range[1] = range[1];
51 write_sequnlock(&net->ipv4.ip_local_ports.lock);
52 }
53
54 /* Validate changes from /proc interface. */
55 static int ipv4_local_port_range(struct ctl_table *table, int write,
56 void __user *buffer,
57 size_t *lenp, loff_t *ppos)
58 {
59 struct net *net =
60 container_of(table->data, struct net, ipv4.ip_local_ports.range);
61 int ret;
62 int range[2];
63 struct ctl_table tmp = {
64 .data = &range,
65 .maxlen = sizeof(range),
66 .mode = table->mode,
67 .extra1 = &ip_local_port_range_min,
68 .extra2 = &ip_local_port_range_max,
69 };
70
71 inet_get_local_port_range(net, &range[0], &range[1]);
72
73 ret = proc_dointvec_minmax(&tmp, write, buffer, lenp, ppos);
74
75 if (write && ret == 0) {
76 if (range[1] < range[0])
77 ret = -EINVAL;
78 else
79 set_local_port_range(net, range);
80 }
81
82 return ret;
83 }
84
85
86 static void inet_get_ping_group_range_table(struct ctl_table *table, kgid_t *low, kgid_t *high)
87 {
88 kgid_t *data = table->data;
89 struct net *net =
90 container_of(table->data, struct net, ipv4.ping_group_range.range);
91 unsigned int seq;
92 do {
93 seq = read_seqbegin(&net->ipv4.ip_local_ports.lock);
94
95 *low = data[0];
96 *high = data[1];
97 } while (read_seqretry(&net->ipv4.ip_local_ports.lock, seq));
98 }
99
100 /* Update system visible IP port range */
101 static void set_ping_group_range(struct ctl_table *table, kgid_t low, kgid_t high)
102 {
103 kgid_t *data = table->data;
104 struct net *net =
105 container_of(table->data, struct net, ipv4.ping_group_range.range);
106 write_seqlock(&net->ipv4.ip_local_ports.lock);
107 data[0] = low;
108 data[1] = high;
109 write_sequnlock(&net->ipv4.ip_local_ports.lock);
110 }
111
112 /* Validate changes from /proc interface. */
113 static int ipv4_ping_group_range(struct ctl_table *table, int write,
114 void __user *buffer,
115 size_t *lenp, loff_t *ppos)
116 {
117 struct user_namespace *user_ns = current_user_ns();
118 int ret;
119 gid_t urange[2];
120 kgid_t low, high;
121 struct ctl_table tmp = {
122 .data = &urange,
123 .maxlen = sizeof(urange),
124 .mode = table->mode,
125 .extra1 = &ip_ping_group_range_min,
126 .extra2 = &ip_ping_group_range_max,
127 };
128
129 inet_get_ping_group_range_table(table, &low, &high);
130 urange[0] = from_kgid_munged(user_ns, low);
131 urange[1] = from_kgid_munged(user_ns, high);
132 ret = proc_dointvec_minmax(&tmp, write, buffer, lenp, ppos);
133
134 if (write && ret == 0) {
135 low = make_kgid(user_ns, urange[0]);
136 high = make_kgid(user_ns, urange[1]);
137 if (!gid_valid(low) || !gid_valid(high) ||
138 (urange[1] < urange[0]) || gid_lt(high, low)) {
139 low = make_kgid(&init_user_ns, 1);
140 high = make_kgid(&init_user_ns, 0);
141 }
142 set_ping_group_range(table, low, high);
143 }
144
145 return ret;
146 }
147
148 static int proc_tcp_congestion_control(struct ctl_table *ctl, int write,
149 void __user *buffer, size_t *lenp, loff_t *ppos)
150 {
151 char val[TCP_CA_NAME_MAX];
152 struct ctl_table tbl = {
153 .data = val,
154 .maxlen = TCP_CA_NAME_MAX,
155 };
156 int ret;
157
158 tcp_get_default_congestion_control(val);
159
160 ret = proc_dostring(&tbl, write, buffer, lenp, ppos);
161 if (write && ret == 0)
162 ret = tcp_set_default_congestion_control(val);
163 return ret;
164 }
165
166 static int proc_tcp_available_congestion_control(struct ctl_table *ctl,
167 int write,
168 void __user *buffer, size_t *lenp,
169 loff_t *ppos)
170 {
171 struct ctl_table tbl = { .maxlen = TCP_CA_BUF_MAX, };
172 int ret;
173
174 tbl.data = kmalloc(tbl.maxlen, GFP_USER);
175 if (!tbl.data)
176 return -ENOMEM;
177 tcp_get_available_congestion_control(tbl.data, TCP_CA_BUF_MAX);
178 ret = proc_dostring(&tbl, write, buffer, lenp, ppos);
179 kfree(tbl.data);
180 return ret;
181 }
182
183 static int proc_allowed_congestion_control(struct ctl_table *ctl,
184 int write,
185 void __user *buffer, size_t *lenp,
186 loff_t *ppos)
187 {
188 struct ctl_table tbl = { .maxlen = TCP_CA_BUF_MAX };
189 int ret;
190
191 tbl.data = kmalloc(tbl.maxlen, GFP_USER);
192 if (!tbl.data)
193 return -ENOMEM;
194
195 tcp_get_allowed_congestion_control(tbl.data, tbl.maxlen);
196 ret = proc_dostring(&tbl, write, buffer, lenp, ppos);
197 if (write && ret == 0)
198 ret = tcp_set_allowed_congestion_control(tbl.data);
199 kfree(tbl.data);
200 return ret;
201 }
202
203 static int proc_tcp_fastopen_key(struct ctl_table *ctl, int write,
204 void __user *buffer, size_t *lenp,
205 loff_t *ppos)
206 {
207 struct ctl_table tbl = { .maxlen = (TCP_FASTOPEN_KEY_LENGTH * 2 + 10) };
208 struct tcp_fastopen_context *ctxt;
209 int ret;
210 u32 user_key[4]; /* 16 bytes, matching TCP_FASTOPEN_KEY_LENGTH */
211
212 tbl.data = kmalloc(tbl.maxlen, GFP_KERNEL);
213 if (!tbl.data)
214 return -ENOMEM;
215
216 rcu_read_lock();
217 ctxt = rcu_dereference(tcp_fastopen_ctx);
218 if (ctxt)
219 memcpy(user_key, ctxt->key, TCP_FASTOPEN_KEY_LENGTH);
220 else
221 memset(user_key, 0, sizeof(user_key));
222 rcu_read_unlock();
223
224 snprintf(tbl.data, tbl.maxlen, "%08x-%08x-%08x-%08x",
225 user_key[0], user_key[1], user_key[2], user_key[3]);
226 ret = proc_dostring(&tbl, write, buffer, lenp, ppos);
227
228 if (write && ret == 0) {
229 if (sscanf(tbl.data, "%x-%x-%x-%x", user_key, user_key + 1,
230 user_key + 2, user_key + 3) != 4) {
231 ret = -EINVAL;
232 goto bad_key;
233 }
234 /* Generate a dummy secret but don't publish it. This
235 * is needed so we don't regenerate a new key on the
236 * first invocation of tcp_fastopen_cookie_gen
237 */
238 tcp_fastopen_init_key_once(false);
239 tcp_fastopen_reset_cipher(user_key, TCP_FASTOPEN_KEY_LENGTH);
240 }
241
242 bad_key:
243 pr_debug("proc FO key set 0x%x-%x-%x-%x <- 0x%s: %u\n",
244 user_key[0], user_key[1], user_key[2], user_key[3],
245 (char *)tbl.data, ret);
246 kfree(tbl.data);
247 return ret;
248 }
249
250 static struct ctl_table ipv4_table[] = {
251 {
252 .procname = "tcp_timestamps",
253 .data = &sysctl_tcp_timestamps,
254 .maxlen = sizeof(int),
255 .mode = 0644,
256 .proc_handler = proc_dointvec
257 },
258 {
259 .procname = "tcp_window_scaling",
260 .data = &sysctl_tcp_window_scaling,
261 .maxlen = sizeof(int),
262 .mode = 0644,
263 .proc_handler = proc_dointvec
264 },
265 {
266 .procname = "tcp_sack",
267 .data = &sysctl_tcp_sack,
268 .maxlen = sizeof(int),
269 .mode = 0644,
270 .proc_handler = proc_dointvec
271 },
272 {
273 .procname = "tcp_retrans_collapse",
274 .data = &sysctl_tcp_retrans_collapse,
275 .maxlen = sizeof(int),
276 .mode = 0644,
277 .proc_handler = proc_dointvec
278 },
279 {
280 .procname = "ip_default_ttl",
281 .data = &sysctl_ip_default_ttl,
282 .maxlen = sizeof(int),
283 .mode = 0644,
284 .proc_handler = proc_dointvec_minmax,
285 .extra1 = &ip_ttl_min,
286 .extra2 = &ip_ttl_max,
287 },
288 {
289 .procname = "ip_nonlocal_bind",
290 .data = &sysctl_ip_nonlocal_bind,
291 .maxlen = sizeof(int),
292 .mode = 0644,
293 .proc_handler = proc_dointvec
294 },
295 {
296 .procname = "tcp_syn_retries",
297 .data = &sysctl_tcp_syn_retries,
298 .maxlen = sizeof(int),
299 .mode = 0644,
300 .proc_handler = proc_dointvec_minmax,
301 .extra1 = &tcp_syn_retries_min,
302 .extra2 = &tcp_syn_retries_max
303 },
304 {
305 .procname = "tcp_synack_retries",
306 .data = &sysctl_tcp_synack_retries,
307 .maxlen = sizeof(int),
308 .mode = 0644,
309 .proc_handler = proc_dointvec
310 },
311 {
312 .procname = "tcp_max_orphans",
313 .data = &sysctl_tcp_max_orphans,
314 .maxlen = sizeof(int),
315 .mode = 0644,
316 .proc_handler = proc_dointvec
317 },
318 {
319 .procname = "tcp_max_tw_buckets",
320 .data = &tcp_death_row.sysctl_max_tw_buckets,
321 .maxlen = sizeof(int),
322 .mode = 0644,
323 .proc_handler = proc_dointvec
324 },
325 {
326 .procname = "ip_early_demux",
327 .data = &sysctl_ip_early_demux,
328 .maxlen = sizeof(int),
329 .mode = 0644,
330 .proc_handler = proc_dointvec
331 },
332 {
333 .procname = "ip_dynaddr",
334 .data = &sysctl_ip_dynaddr,
335 .maxlen = sizeof(int),
336 .mode = 0644,
337 .proc_handler = proc_dointvec
338 },
339 {
340 .procname = "tcp_keepalive_time",
341 .data = &sysctl_tcp_keepalive_time,
342 .maxlen = sizeof(int),
343 .mode = 0644,
344 .proc_handler = proc_dointvec_jiffies,
345 },
346 {
347 .procname = "tcp_keepalive_probes",
348 .data = &sysctl_tcp_keepalive_probes,
349 .maxlen = sizeof(int),
350 .mode = 0644,
351 .proc_handler = proc_dointvec
352 },
353 {
354 .procname = "tcp_keepalive_intvl",
355 .data = &sysctl_tcp_keepalive_intvl,
356 .maxlen = sizeof(int),
357 .mode = 0644,
358 .proc_handler = proc_dointvec_jiffies,
359 },
360 {
361 .procname = "tcp_retries1",
362 .data = &sysctl_tcp_retries1,
363 .maxlen = sizeof(int),
364 .mode = 0644,
365 .proc_handler = proc_dointvec_minmax,
366 .extra2 = &tcp_retr1_max
367 },
368 {
369 .procname = "tcp_retries2",
370 .data = &sysctl_tcp_retries2,
371 .maxlen = sizeof(int),
372 .mode = 0644,
373 .proc_handler = proc_dointvec
374 },
375 {
376 .procname = "tcp_fin_timeout",
377 .data = &sysctl_tcp_fin_timeout,
378 .maxlen = sizeof(int),
379 .mode = 0644,
380 .proc_handler = proc_dointvec_jiffies,
381 },
382 #ifdef CONFIG_SYN_COOKIES
383 {
384 .procname = "tcp_syncookies",
385 .data = &sysctl_tcp_syncookies,
386 .maxlen = sizeof(int),
387 .mode = 0644,
388 .proc_handler = proc_dointvec
389 },
390 #endif
391 {
392 .procname = "tcp_fastopen",
393 .data = &sysctl_tcp_fastopen,
394 .maxlen = sizeof(int),
395 .mode = 0644,
396 .proc_handler = proc_dointvec,
397 },
398 {
399 .procname = "tcp_fastopen_key",
400 .mode = 0600,
401 .maxlen = ((TCP_FASTOPEN_KEY_LENGTH * 2) + 10),
402 .proc_handler = proc_tcp_fastopen_key,
403 },
404 {
405 .procname = "tcp_tw_recycle",
406 .data = &tcp_death_row.sysctl_tw_recycle,
407 .maxlen = sizeof(int),
408 .mode = 0644,
409 .proc_handler = proc_dointvec
410 },
411 {
412 .procname = "tcp_abort_on_overflow",
413 .data = &sysctl_tcp_abort_on_overflow,
414 .maxlen = sizeof(int),
415 .mode = 0644,
416 .proc_handler = proc_dointvec
417 },
418 {
419 .procname = "tcp_stdurg",
420 .data = &sysctl_tcp_stdurg,
421 .maxlen = sizeof(int),
422 .mode = 0644,
423 .proc_handler = proc_dointvec
424 },
425 {
426 .procname = "tcp_rfc1337",
427 .data = &sysctl_tcp_rfc1337,
428 .maxlen = sizeof(int),
429 .mode = 0644,
430 .proc_handler = proc_dointvec
431 },
432 {
433 .procname = "tcp_max_syn_backlog",
434 .data = &sysctl_max_syn_backlog,
435 .maxlen = sizeof(int),
436 .mode = 0644,
437 .proc_handler = proc_dointvec
438 },
439 {
440 .procname = "igmp_max_memberships",
441 .data = &sysctl_igmp_max_memberships,
442 .maxlen = sizeof(int),
443 .mode = 0644,
444 .proc_handler = proc_dointvec
445 },
446 {
447 .procname = "igmp_max_msf",
448 .data = &sysctl_igmp_max_msf,
449 .maxlen = sizeof(int),
450 .mode = 0644,
451 .proc_handler = proc_dointvec
452 },
453 {
454 .procname = "inet_peer_threshold",
455 .data = &inet_peer_threshold,
456 .maxlen = sizeof(int),
457 .mode = 0644,
458 .proc_handler = proc_dointvec
459 },
460 {
461 .procname = "inet_peer_minttl",
462 .data = &inet_peer_minttl,
463 .maxlen = sizeof(int),
464 .mode = 0644,
465 .proc_handler = proc_dointvec_jiffies,
466 },
467 {
468 .procname = "inet_peer_maxttl",
469 .data = &inet_peer_maxttl,
470 .maxlen = sizeof(int),
471 .mode = 0644,
472 .proc_handler = proc_dointvec_jiffies,
473 },
474 {
475 .procname = "tcp_orphan_retries",
476 .data = &sysctl_tcp_orphan_retries,
477 .maxlen = sizeof(int),
478 .mode = 0644,
479 .proc_handler = proc_dointvec
480 },
481 {
482 .procname = "tcp_fack",
483 .data = &sysctl_tcp_fack,
484 .maxlen = sizeof(int),
485 .mode = 0644,
486 .proc_handler = proc_dointvec
487 },
488 {
489 .procname = "tcp_reordering",
490 .data = &sysctl_tcp_reordering,
491 .maxlen = sizeof(int),
492 .mode = 0644,
493 .proc_handler = proc_dointvec
494 },
495 {
496 .procname = "tcp_dsack",
497 .data = &sysctl_tcp_dsack,
498 .maxlen = sizeof(int),
499 .mode = 0644,
500 .proc_handler = proc_dointvec
501 },
502 {
503 .procname = "tcp_mem",
504 .maxlen = sizeof(sysctl_tcp_mem),
505 .data = &sysctl_tcp_mem,
506 .mode = 0644,
507 .proc_handler = proc_doulongvec_minmax,
508 },
509 {
510 .procname = "tcp_wmem",
511 .data = &sysctl_tcp_wmem,
512 .maxlen = sizeof(sysctl_tcp_wmem),
513 .mode = 0644,
514 .proc_handler = proc_dointvec_minmax,
515 .extra1 = &one,
516 },
517 {
518 .procname = "tcp_notsent_lowat",
519 .data = &sysctl_tcp_notsent_lowat,
520 .maxlen = sizeof(sysctl_tcp_notsent_lowat),
521 .mode = 0644,
522 .proc_handler = proc_dointvec,
523 },
524 {
525 .procname = "tcp_rmem",
526 .data = &sysctl_tcp_rmem,
527 .maxlen = sizeof(sysctl_tcp_rmem),
528 .mode = 0644,
529 .proc_handler = proc_dointvec_minmax,
530 .extra1 = &one,
531 },
532 {
533 .procname = "tcp_app_win",
534 .data = &sysctl_tcp_app_win,
535 .maxlen = sizeof(int),
536 .mode = 0644,
537 .proc_handler = proc_dointvec
538 },
539 {
540 .procname = "tcp_adv_win_scale",
541 .data = &sysctl_tcp_adv_win_scale,
542 .maxlen = sizeof(int),
543 .mode = 0644,
544 .proc_handler = proc_dointvec_minmax,
545 .extra1 = &tcp_adv_win_scale_min,
546 .extra2 = &tcp_adv_win_scale_max,
547 },
548 {
549 .procname = "tcp_tw_reuse",
550 .data = &sysctl_tcp_tw_reuse,
551 .maxlen = sizeof(int),
552 .mode = 0644,
553 .proc_handler = proc_dointvec
554 },
555 {
556 .procname = "tcp_frto",
557 .data = &sysctl_tcp_frto,
558 .maxlen = sizeof(int),
559 .mode = 0644,
560 .proc_handler = proc_dointvec
561 },
562 {
563 .procname = "tcp_low_latency",
564 .data = &sysctl_tcp_low_latency,
565 .maxlen = sizeof(int),
566 .mode = 0644,
567 .proc_handler = proc_dointvec
568 },
569 {
570 .procname = "tcp_no_metrics_save",
571 .data = &sysctl_tcp_nometrics_save,
572 .maxlen = sizeof(int),
573 .mode = 0644,
574 .proc_handler = proc_dointvec,
575 },
576 {
577 .procname = "tcp_moderate_rcvbuf",
578 .data = &sysctl_tcp_moderate_rcvbuf,
579 .maxlen = sizeof(int),
580 .mode = 0644,
581 .proc_handler = proc_dointvec,
582 },
583 {
584 .procname = "tcp_tso_win_divisor",
585 .data = &sysctl_tcp_tso_win_divisor,
586 .maxlen = sizeof(int),
587 .mode = 0644,
588 .proc_handler = proc_dointvec,
589 },
590 {
591 .procname = "tcp_congestion_control",
592 .mode = 0644,
593 .maxlen = TCP_CA_NAME_MAX,
594 .proc_handler = proc_tcp_congestion_control,
595 },
596 {
597 .procname = "tcp_mtu_probing",
598 .data = &sysctl_tcp_mtu_probing,
599 .maxlen = sizeof(int),
600 .mode = 0644,
601 .proc_handler = proc_dointvec,
602 },
603 {
604 .procname = "tcp_base_mss",
605 .data = &sysctl_tcp_base_mss,
606 .maxlen = sizeof(int),
607 .mode = 0644,
608 .proc_handler = proc_dointvec,
609 },
610 {
611 .procname = "tcp_workaround_signed_windows",
612 .data = &sysctl_tcp_workaround_signed_windows,
613 .maxlen = sizeof(int),
614 .mode = 0644,
615 .proc_handler = proc_dointvec
616 },
617 {
618 .procname = "tcp_limit_output_bytes",
619 .data = &sysctl_tcp_limit_output_bytes,
620 .maxlen = sizeof(int),
621 .mode = 0644,
622 .proc_handler = proc_dointvec
623 },
624 {
625 .procname = "tcp_challenge_ack_limit",
626 .data = &sysctl_tcp_challenge_ack_limit,
627 .maxlen = sizeof(int),
628 .mode = 0644,
629 .proc_handler = proc_dointvec
630 },
631 #ifdef CONFIG_NET_DMA
632 {
633 .procname = "tcp_dma_copybreak",
634 .data = &sysctl_tcp_dma_copybreak,
635 .maxlen = sizeof(int),
636 .mode = 0644,
637 .proc_handler = proc_dointvec
638 },
639 #endif
640 {
641 .procname = "tcp_slow_start_after_idle",
642 .data = &sysctl_tcp_slow_start_after_idle,
643 .maxlen = sizeof(int),
644 .mode = 0644,
645 .proc_handler = proc_dointvec
646 },
647 #ifdef CONFIG_NETLABEL
648 {
649 .procname = "cipso_cache_enable",
650 .data = &cipso_v4_cache_enabled,
651 .maxlen = sizeof(int),
652 .mode = 0644,
653 .proc_handler = proc_dointvec,
654 },
655 {
656 .procname = "cipso_cache_bucket_size",
657 .data = &cipso_v4_cache_bucketsize,
658 .maxlen = sizeof(int),
659 .mode = 0644,
660 .proc_handler = proc_dointvec,
661 },
662 {
663 .procname = "cipso_rbm_optfmt",
664 .data = &cipso_v4_rbm_optfmt,
665 .maxlen = sizeof(int),
666 .mode = 0644,
667 .proc_handler = proc_dointvec,
668 },
669 {
670 .procname = "cipso_rbm_strictvalid",
671 .data = &cipso_v4_rbm_strictvalid,
672 .maxlen = sizeof(int),
673 .mode = 0644,
674 .proc_handler = proc_dointvec,
675 },
676 #endif /* CONFIG_NETLABEL */
677 {
678 .procname = "tcp_available_congestion_control",
679 .maxlen = TCP_CA_BUF_MAX,
680 .mode = 0444,
681 .proc_handler = proc_tcp_available_congestion_control,
682 },
683 {
684 .procname = "tcp_allowed_congestion_control",
685 .maxlen = TCP_CA_BUF_MAX,
686 .mode = 0644,
687 .proc_handler = proc_allowed_congestion_control,
688 },
689 {
690 .procname = "tcp_thin_linear_timeouts",
691 .data = &sysctl_tcp_thin_linear_timeouts,
692 .maxlen = sizeof(int),
693 .mode = 0644,
694 .proc_handler = proc_dointvec
695 },
696 {
697 .procname = "tcp_thin_dupack",
698 .data = &sysctl_tcp_thin_dupack,
699 .maxlen = sizeof(int),
700 .mode = 0644,
701 .proc_handler = proc_dointvec
702 },
703 {
704 .procname = "tcp_early_retrans",
705 .data = &sysctl_tcp_early_retrans,
706 .maxlen = sizeof(int),
707 .mode = 0644,
708 .proc_handler = proc_dointvec_minmax,
709 .extra1 = &zero,
710 .extra2 = &four,
711 },
712 {
713 .procname = "tcp_min_tso_segs",
714 .data = &sysctl_tcp_min_tso_segs,
715 .maxlen = sizeof(int),
716 .mode = 0644,
717 .proc_handler = proc_dointvec_minmax,
718 .extra1 = &zero,
719 .extra2 = &gso_max_segs,
720 },
721 {
722 .procname = "tcp_autocorking",
723 .data = &sysctl_tcp_autocorking,
724 .maxlen = sizeof(int),
725 .mode = 0644,
726 .proc_handler = proc_dointvec_minmax,
727 .extra1 = &zero,
728 .extra2 = &one,
729 },
730 {
731 .procname = "udp_mem",
732 .data = &sysctl_udp_mem,
733 .maxlen = sizeof(sysctl_udp_mem),
734 .mode = 0644,
735 .proc_handler = proc_doulongvec_minmax,
736 },
737 {
738 .procname = "udp_rmem_min",
739 .data = &sysctl_udp_rmem_min,
740 .maxlen = sizeof(sysctl_udp_rmem_min),
741 .mode = 0644,
742 .proc_handler = proc_dointvec_minmax,
743 .extra1 = &one
744 },
745 {
746 .procname = "udp_wmem_min",
747 .data = &sysctl_udp_wmem_min,
748 .maxlen = sizeof(sysctl_udp_wmem_min),
749 .mode = 0644,
750 .proc_handler = proc_dointvec_minmax,
751 .extra1 = &one
752 },
753 { }
754 };
755
756 static struct ctl_table ipv4_net_table[] = {
757 {
758 .procname = "icmp_echo_ignore_all",
759 .data = &init_net.ipv4.sysctl_icmp_echo_ignore_all,
760 .maxlen = sizeof(int),
761 .mode = 0644,
762 .proc_handler = proc_dointvec
763 },
764 {
765 .procname = "icmp_echo_ignore_broadcasts",
766 .data = &init_net.ipv4.sysctl_icmp_echo_ignore_broadcasts,
767 .maxlen = sizeof(int),
768 .mode = 0644,
769 .proc_handler = proc_dointvec
770 },
771 {
772 .procname = "icmp_ignore_bogus_error_responses",
773 .data = &init_net.ipv4.sysctl_icmp_ignore_bogus_error_responses,
774 .maxlen = sizeof(int),
775 .mode = 0644,
776 .proc_handler = proc_dointvec
777 },
778 {
779 .procname = "icmp_errors_use_inbound_ifaddr",
780 .data = &init_net.ipv4.sysctl_icmp_errors_use_inbound_ifaddr,
781 .maxlen = sizeof(int),
782 .mode = 0644,
783 .proc_handler = proc_dointvec
784 },
785 {
786 .procname = "icmp_ratelimit",
787 .data = &init_net.ipv4.sysctl_icmp_ratelimit,
788 .maxlen = sizeof(int),
789 .mode = 0644,
790 .proc_handler = proc_dointvec_ms_jiffies,
791 },
792 {
793 .procname = "icmp_ratemask",
794 .data = &init_net.ipv4.sysctl_icmp_ratemask,
795 .maxlen = sizeof(int),
796 .mode = 0644,
797 .proc_handler = proc_dointvec
798 },
799 {
800 .procname = "ping_group_range",
801 .data = &init_net.ipv4.ping_group_range.range,
802 .maxlen = sizeof(gid_t)*2,
803 .mode = 0644,
804 .proc_handler = ipv4_ping_group_range,
805 },
806 {
807 .procname = "tcp_ecn",
808 .data = &init_net.ipv4.sysctl_tcp_ecn,
809 .maxlen = sizeof(int),
810 .mode = 0644,
811 .proc_handler = proc_dointvec
812 },
813 {
814 .procname = "ip_local_port_range",
815 .maxlen = sizeof(init_net.ipv4.ip_local_ports.range),
816 .data = &init_net.ipv4.ip_local_ports.range,
817 .mode = 0644,
818 .proc_handler = ipv4_local_port_range,
819 },
820 {
821 .procname = "ip_local_reserved_ports",
822 .data = &init_net.ipv4.sysctl_local_reserved_ports,
823 .maxlen = 65536,
824 .mode = 0644,
825 .proc_handler = proc_do_large_bitmap,
826 },
827 {
828 .procname = "ip_no_pmtu_disc",
829 .data = &init_net.ipv4.sysctl_ip_no_pmtu_disc,
830 .maxlen = sizeof(int),
831 .mode = 0644,
832 .proc_handler = proc_dointvec
833 },
834 {
835 .procname = "ip_forward_use_pmtu",
836 .data = &init_net.ipv4.sysctl_ip_fwd_use_pmtu,
837 .maxlen = sizeof(int),
838 .mode = 0644,
839 .proc_handler = proc_dointvec,
840 },
841 {
842 .procname = "fwmark_reflect",
843 .data = &init_net.ipv4.sysctl_fwmark_reflect,
844 .maxlen = sizeof(int),
845 .mode = 0644,
846 .proc_handler = proc_dointvec,
847 },
848 {
849 .procname = "tcp_fwmark_accept",
850 .data = &init_net.ipv4.sysctl_tcp_fwmark_accept,
851 .maxlen = sizeof(int),
852 .mode = 0644,
853 .proc_handler = proc_dointvec,
854 },
855 { }
856 };
857
858 static __net_init int ipv4_sysctl_init_net(struct net *net)
859 {
860 struct ctl_table *table;
861
862 table = ipv4_net_table;
863 if (!net_eq(net, &init_net)) {
864 int i;
865
866 table = kmemdup(table, sizeof(ipv4_net_table), GFP_KERNEL);
867 if (table == NULL)
868 goto err_alloc;
869
870 /* Update the variables to point into the current struct net */
871 for (i = 0; i < ARRAY_SIZE(ipv4_net_table) - 1; i++)
872 table[i].data += (void *)net - (void *)&init_net;
873 }
874
875 net->ipv4.ipv4_hdr = register_net_sysctl(net, "net/ipv4", table);
876 if (net->ipv4.ipv4_hdr == NULL)
877 goto err_reg;
878
879 net->ipv4.sysctl_local_reserved_ports = kzalloc(65536 / 8, GFP_KERNEL);
880 if (!net->ipv4.sysctl_local_reserved_ports)
881 goto err_ports;
882
883 return 0;
884
885 err_ports:
886 unregister_net_sysctl_table(net->ipv4.ipv4_hdr);
887 err_reg:
888 if (!net_eq(net, &init_net))
889 kfree(table);
890 err_alloc:
891 return -ENOMEM;
892 }
893
894 static __net_exit void ipv4_sysctl_exit_net(struct net *net)
895 {
896 struct ctl_table *table;
897
898 kfree(net->ipv4.sysctl_local_reserved_ports);
899 table = net->ipv4.ipv4_hdr->ctl_table_arg;
900 unregister_net_sysctl_table(net->ipv4.ipv4_hdr);
901 kfree(table);
902 }
903
904 static __net_initdata struct pernet_operations ipv4_sysctl_ops = {
905 .init = ipv4_sysctl_init_net,
906 .exit = ipv4_sysctl_exit_net,
907 };
908
909 static __init int sysctl_ipv4_init(void)
910 {
911 struct ctl_table_header *hdr;
912
913 hdr = register_net_sysctl(&init_net, "net/ipv4", ipv4_table);
914 if (hdr == NULL)
915 return -ENOMEM;
916
917 if (register_pernet_subsys(&ipv4_sysctl_ops)) {
918 unregister_net_sysctl_table(hdr);
919 return -ENOMEM;
920 }
921
922 return 0;
923 }
924
925 __initcall(sysctl_ipv4_init);
Linux with added FPC-III support