Loading...
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
29static int zero;
30static int one = 1;
31static int four = 4;
32static int gso_max_segs = GSO_MAX_SEGS;
33static int tcp_retr1_max = 255;
34static int ip_local_port_range_min[] = { 1, 1 };
35static int ip_local_port_range_max[] = { 65535, 65535 };
36static int tcp_adv_win_scale_min = -31;
37static int tcp_adv_win_scale_max = 31;
38static int ip_ttl_min = 1;
39static int ip_ttl_max = 255;
40static int tcp_syn_retries_min = 1;
41static int tcp_syn_retries_max = MAX_TCP_SYNCNT;
42static int ip_ping_group_range_min[] = { 0, 0 };
43static int ip_ping_group_range_max[] = { GID_T_MAX, GID_T_MAX };
44
45/* Update system visible IP port range */
46static 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. */
55static 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
86static 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 */
101static 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. */
113static 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
148static 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
166static 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
183static 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
203static 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
242bad_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
250static 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 = "ip_local_reserved_ports",
441 .data = NULL, /* initialized in sysctl_ipv4_init */
442 .maxlen = 65536,
443 .mode = 0644,
444 .proc_handler = proc_do_large_bitmap,
445 },
446 {
447 .procname = "igmp_max_memberships",
448 .data = &sysctl_igmp_max_memberships,
449 .maxlen = sizeof(int),
450 .mode = 0644,
451 .proc_handler = proc_dointvec
452 },
453 {
454 .procname = "igmp_max_msf",
455 .data = &sysctl_igmp_max_msf,
456 .maxlen = sizeof(int),
457 .mode = 0644,
458 .proc_handler = proc_dointvec
459 },
460 {
461 .procname = "inet_peer_threshold",
462 .data = &inet_peer_threshold,
463 .maxlen = sizeof(int),
464 .mode = 0644,
465 .proc_handler = proc_dointvec
466 },
467 {
468 .procname = "inet_peer_minttl",
469 .data = &inet_peer_minttl,
470 .maxlen = sizeof(int),
471 .mode = 0644,
472 .proc_handler = proc_dointvec_jiffies,
473 },
474 {
475 .procname = "inet_peer_maxttl",
476 .data = &inet_peer_maxttl,
477 .maxlen = sizeof(int),
478 .mode = 0644,
479 .proc_handler = proc_dointvec_jiffies,
480 },
481 {
482 .procname = "tcp_orphan_retries",
483 .data = &sysctl_tcp_orphan_retries,
484 .maxlen = sizeof(int),
485 .mode = 0644,
486 .proc_handler = proc_dointvec
487 },
488 {
489 .procname = "tcp_fack",
490 .data = &sysctl_tcp_fack,
491 .maxlen = sizeof(int),
492 .mode = 0644,
493 .proc_handler = proc_dointvec
494 },
495 {
496 .procname = "tcp_reordering",
497 .data = &sysctl_tcp_reordering,
498 .maxlen = sizeof(int),
499 .mode = 0644,
500 .proc_handler = proc_dointvec
501 },
502 {
503 .procname = "tcp_dsack",
504 .data = &sysctl_tcp_dsack,
505 .maxlen = sizeof(int),
506 .mode = 0644,
507 .proc_handler = proc_dointvec
508 },
509 {
510 .procname = "tcp_mem",
511 .maxlen = sizeof(sysctl_tcp_mem),
512 .data = &sysctl_tcp_mem,
513 .mode = 0644,
514 .proc_handler = proc_doulongvec_minmax,
515 },
516 {
517 .procname = "tcp_wmem",
518 .data = &sysctl_tcp_wmem,
519 .maxlen = sizeof(sysctl_tcp_wmem),
520 .mode = 0644,
521 .proc_handler = proc_dointvec_minmax,
522 .extra1 = &one,
523 },
524 {
525 .procname = "tcp_notsent_lowat",
526 .data = &sysctl_tcp_notsent_lowat,
527 .maxlen = sizeof(sysctl_tcp_notsent_lowat),
528 .mode = 0644,
529 .proc_handler = proc_dointvec,
530 },
531 {
532 .procname = "tcp_rmem",
533 .data = &sysctl_tcp_rmem,
534 .maxlen = sizeof(sysctl_tcp_rmem),
535 .mode = 0644,
536 .proc_handler = proc_dointvec_minmax,
537 .extra1 = &one,
538 },
539 {
540 .procname = "tcp_app_win",
541 .data = &sysctl_tcp_app_win,
542 .maxlen = sizeof(int),
543 .mode = 0644,
544 .proc_handler = proc_dointvec
545 },
546 {
547 .procname = "tcp_adv_win_scale",
548 .data = &sysctl_tcp_adv_win_scale,
549 .maxlen = sizeof(int),
550 .mode = 0644,
551 .proc_handler = proc_dointvec_minmax,
552 .extra1 = &tcp_adv_win_scale_min,
553 .extra2 = &tcp_adv_win_scale_max,
554 },
555 {
556 .procname = "tcp_tw_reuse",
557 .data = &sysctl_tcp_tw_reuse,
558 .maxlen = sizeof(int),
559 .mode = 0644,
560 .proc_handler = proc_dointvec
561 },
562 {
563 .procname = "tcp_frto",
564 .data = &sysctl_tcp_frto,
565 .maxlen = sizeof(int),
566 .mode = 0644,
567 .proc_handler = proc_dointvec
568 },
569 {
570 .procname = "tcp_low_latency",
571 .data = &sysctl_tcp_low_latency,
572 .maxlen = sizeof(int),
573 .mode = 0644,
574 .proc_handler = proc_dointvec
575 },
576 {
577 .procname = "tcp_no_metrics_save",
578 .data = &sysctl_tcp_nometrics_save,
579 .maxlen = sizeof(int),
580 .mode = 0644,
581 .proc_handler = proc_dointvec,
582 },
583 {
584 .procname = "tcp_moderate_rcvbuf",
585 .data = &sysctl_tcp_moderate_rcvbuf,
586 .maxlen = sizeof(int),
587 .mode = 0644,
588 .proc_handler = proc_dointvec,
589 },
590 {
591 .procname = "tcp_tso_win_divisor",
592 .data = &sysctl_tcp_tso_win_divisor,
593 .maxlen = sizeof(int),
594 .mode = 0644,
595 .proc_handler = proc_dointvec,
596 },
597 {
598 .procname = "tcp_congestion_control",
599 .mode = 0644,
600 .maxlen = TCP_CA_NAME_MAX,
601 .proc_handler = proc_tcp_congestion_control,
602 },
603 {
604 .procname = "tcp_mtu_probing",
605 .data = &sysctl_tcp_mtu_probing,
606 .maxlen = sizeof(int),
607 .mode = 0644,
608 .proc_handler = proc_dointvec,
609 },
610 {
611 .procname = "tcp_base_mss",
612 .data = &sysctl_tcp_base_mss,
613 .maxlen = sizeof(int),
614 .mode = 0644,
615 .proc_handler = proc_dointvec,
616 },
617 {
618 .procname = "tcp_workaround_signed_windows",
619 .data = &sysctl_tcp_workaround_signed_windows,
620 .maxlen = sizeof(int),
621 .mode = 0644,
622 .proc_handler = proc_dointvec
623 },
624 {
625 .procname = "tcp_limit_output_bytes",
626 .data = &sysctl_tcp_limit_output_bytes,
627 .maxlen = sizeof(int),
628 .mode = 0644,
629 .proc_handler = proc_dointvec
630 },
631 {
632 .procname = "tcp_challenge_ack_limit",
633 .data = &sysctl_tcp_challenge_ack_limit,
634 .maxlen = sizeof(int),
635 .mode = 0644,
636 .proc_handler = proc_dointvec
637 },
638#ifdef CONFIG_NET_DMA
639 {
640 .procname = "tcp_dma_copybreak",
641 .data = &sysctl_tcp_dma_copybreak,
642 .maxlen = sizeof(int),
643 .mode = 0644,
644 .proc_handler = proc_dointvec
645 },
646#endif
647 {
648 .procname = "tcp_slow_start_after_idle",
649 .data = &sysctl_tcp_slow_start_after_idle,
650 .maxlen = sizeof(int),
651 .mode = 0644,
652 .proc_handler = proc_dointvec
653 },
654#ifdef CONFIG_NETLABEL
655 {
656 .procname = "cipso_cache_enable",
657 .data = &cipso_v4_cache_enabled,
658 .maxlen = sizeof(int),
659 .mode = 0644,
660 .proc_handler = proc_dointvec,
661 },
662 {
663 .procname = "cipso_cache_bucket_size",
664 .data = &cipso_v4_cache_bucketsize,
665 .maxlen = sizeof(int),
666 .mode = 0644,
667 .proc_handler = proc_dointvec,
668 },
669 {
670 .procname = "cipso_rbm_optfmt",
671 .data = &cipso_v4_rbm_optfmt,
672 .maxlen = sizeof(int),
673 .mode = 0644,
674 .proc_handler = proc_dointvec,
675 },
676 {
677 .procname = "cipso_rbm_strictvalid",
678 .data = &cipso_v4_rbm_strictvalid,
679 .maxlen = sizeof(int),
680 .mode = 0644,
681 .proc_handler = proc_dointvec,
682 },
683#endif /* CONFIG_NETLABEL */
684 {
685 .procname = "tcp_available_congestion_control",
686 .maxlen = TCP_CA_BUF_MAX,
687 .mode = 0444,
688 .proc_handler = proc_tcp_available_congestion_control,
689 },
690 {
691 .procname = "tcp_allowed_congestion_control",
692 .maxlen = TCP_CA_BUF_MAX,
693 .mode = 0644,
694 .proc_handler = proc_allowed_congestion_control,
695 },
696 {
697 .procname = "tcp_thin_linear_timeouts",
698 .data = &sysctl_tcp_thin_linear_timeouts,
699 .maxlen = sizeof(int),
700 .mode = 0644,
701 .proc_handler = proc_dointvec
702 },
703 {
704 .procname = "tcp_thin_dupack",
705 .data = &sysctl_tcp_thin_dupack,
706 .maxlen = sizeof(int),
707 .mode = 0644,
708 .proc_handler = proc_dointvec
709 },
710 {
711 .procname = "tcp_early_retrans",
712 .data = &sysctl_tcp_early_retrans,
713 .maxlen = sizeof(int),
714 .mode = 0644,
715 .proc_handler = proc_dointvec_minmax,
716 .extra1 = &zero,
717 .extra2 = &four,
718 },
719 {
720 .procname = "tcp_min_tso_segs",
721 .data = &sysctl_tcp_min_tso_segs,
722 .maxlen = sizeof(int),
723 .mode = 0644,
724 .proc_handler = proc_dointvec_minmax,
725 .extra1 = &zero,
726 .extra2 = &gso_max_segs,
727 },
728 {
729 .procname = "tcp_autocorking",
730 .data = &sysctl_tcp_autocorking,
731 .maxlen = sizeof(int),
732 .mode = 0644,
733 .proc_handler = proc_dointvec_minmax,
734 .extra1 = &zero,
735 .extra2 = &one,
736 },
737 {
738 .procname = "udp_mem",
739 .data = &sysctl_udp_mem,
740 .maxlen = sizeof(sysctl_udp_mem),
741 .mode = 0644,
742 .proc_handler = proc_doulongvec_minmax,
743 },
744 {
745 .procname = "udp_rmem_min",
746 .data = &sysctl_udp_rmem_min,
747 .maxlen = sizeof(sysctl_udp_rmem_min),
748 .mode = 0644,
749 .proc_handler = proc_dointvec_minmax,
750 .extra1 = &one
751 },
752 {
753 .procname = "udp_wmem_min",
754 .data = &sysctl_udp_wmem_min,
755 .maxlen = sizeof(sysctl_udp_wmem_min),
756 .mode = 0644,
757 .proc_handler = proc_dointvec_minmax,
758 .extra1 = &one
759 },
760 { }
761};
762
763static struct ctl_table ipv4_net_table[] = {
764 {
765 .procname = "icmp_echo_ignore_all",
766 .data = &init_net.ipv4.sysctl_icmp_echo_ignore_all,
767 .maxlen = sizeof(int),
768 .mode = 0644,
769 .proc_handler = proc_dointvec
770 },
771 {
772 .procname = "icmp_echo_ignore_broadcasts",
773 .data = &init_net.ipv4.sysctl_icmp_echo_ignore_broadcasts,
774 .maxlen = sizeof(int),
775 .mode = 0644,
776 .proc_handler = proc_dointvec
777 },
778 {
779 .procname = "icmp_ignore_bogus_error_responses",
780 .data = &init_net.ipv4.sysctl_icmp_ignore_bogus_error_responses,
781 .maxlen = sizeof(int),
782 .mode = 0644,
783 .proc_handler = proc_dointvec
784 },
785 {
786 .procname = "icmp_errors_use_inbound_ifaddr",
787 .data = &init_net.ipv4.sysctl_icmp_errors_use_inbound_ifaddr,
788 .maxlen = sizeof(int),
789 .mode = 0644,
790 .proc_handler = proc_dointvec
791 },
792 {
793 .procname = "icmp_ratelimit",
794 .data = &init_net.ipv4.sysctl_icmp_ratelimit,
795 .maxlen = sizeof(int),
796 .mode = 0644,
797 .proc_handler = proc_dointvec_ms_jiffies,
798 },
799 {
800 .procname = "icmp_ratemask",
801 .data = &init_net.ipv4.sysctl_icmp_ratemask,
802 .maxlen = sizeof(int),
803 .mode = 0644,
804 .proc_handler = proc_dointvec
805 },
806 {
807 .procname = "ping_group_range",
808 .data = &init_net.ipv4.ping_group_range.range,
809 .maxlen = sizeof(gid_t)*2,
810 .mode = 0644,
811 .proc_handler = ipv4_ping_group_range,
812 },
813 {
814 .procname = "tcp_ecn",
815 .data = &init_net.ipv4.sysctl_tcp_ecn,
816 .maxlen = sizeof(int),
817 .mode = 0644,
818 .proc_handler = proc_dointvec
819 },
820 {
821 .procname = "ip_local_port_range",
822 .maxlen = sizeof(init_net.ipv4.ip_local_ports.range),
823 .data = &init_net.ipv4.ip_local_ports.range,
824 .mode = 0644,
825 .proc_handler = ipv4_local_port_range,
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};
843
844static __net_init int ipv4_sysctl_init_net(struct net *net)
845{
846 struct ctl_table *table;
847
848 table = ipv4_net_table;
849 if (!net_eq(net, &init_net)) {
850 int i;
851
852 table = kmemdup(table, sizeof(ipv4_net_table), GFP_KERNEL);
853 if (table == NULL)
854 goto err_alloc;
855
856 /* Update the variables to point into the current struct net */
857 for (i = 0; i < ARRAY_SIZE(ipv4_net_table) - 1; i++)
858 table[i].data += (void *)net - (void *)&init_net;
859 }
860
861 net->ipv4.ipv4_hdr = register_net_sysctl(net, "net/ipv4", table);
862 if (net->ipv4.ipv4_hdr == NULL)
863 goto err_reg;
864
865 return 0;
866
867err_reg:
868 if (!net_eq(net, &init_net))
869 kfree(table);
870err_alloc:
871 return -ENOMEM;
872}
873
874static __net_exit void ipv4_sysctl_exit_net(struct net *net)
875{
876 struct ctl_table *table;
877
878 table = net->ipv4.ipv4_hdr->ctl_table_arg;
879 unregister_net_sysctl_table(net->ipv4.ipv4_hdr);
880 kfree(table);
881}
882
883static __net_initdata struct pernet_operations ipv4_sysctl_ops = {
884 .init = ipv4_sysctl_init_net,
885 .exit = ipv4_sysctl_exit_net,
886};
887
888static __init int sysctl_ipv4_init(void)
889{
890 struct ctl_table_header *hdr;
891 struct ctl_table *i;
892
893 for (i = ipv4_table; i->procname; i++) {
894 if (strcmp(i->procname, "ip_local_reserved_ports") == 0) {
895 i->data = sysctl_local_reserved_ports;
896 break;
897 }
898 }
899 if (!i->procname)
900 return -EINVAL;
901
902 hdr = register_net_sysctl(&init_net, "net/ipv4", ipv4_table);
903 if (hdr == NULL)
904 return -ENOMEM;
905
906 if (register_pernet_subsys(&ipv4_sysctl_ops)) {
907 unregister_net_sysctl_table(hdr);
908 return -ENOMEM;
909 }
910
911 return 0;
912}
913
914__initcall(sysctl_ipv4_init);
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
29static int zero;
30static int two = 2;
31static int tcp_retr1_max = 255;
32static int ip_local_port_range_min[] = { 1, 1 };
33static int ip_local_port_range_max[] = { 65535, 65535 };
34static int tcp_adv_win_scale_min = -31;
35static int tcp_adv_win_scale_max = 31;
36static int ip_ttl_min = 1;
37static int ip_ttl_max = 255;
38static int ip_ping_group_range_min[] = { 0, 0 };
39static int ip_ping_group_range_max[] = { GID_T_MAX, GID_T_MAX };
40
41/* Update system visible IP port range */
42static void set_local_port_range(int range[2])
43{
44 write_seqlock(&sysctl_local_ports.lock);
45 sysctl_local_ports.range[0] = range[0];
46 sysctl_local_ports.range[1] = range[1];
47 write_sequnlock(&sysctl_local_ports.lock);
48}
49
50/* Validate changes from /proc interface. */
51static int ipv4_local_port_range(ctl_table *table, int write,
52 void __user *buffer,
53 size_t *lenp, loff_t *ppos)
54{
55 int ret;
56 int range[2];
57 ctl_table tmp = {
58 .data = &range,
59 .maxlen = sizeof(range),
60 .mode = table->mode,
61 .extra1 = &ip_local_port_range_min,
62 .extra2 = &ip_local_port_range_max,
63 };
64
65 inet_get_local_port_range(range, range + 1);
66 ret = proc_dointvec_minmax(&tmp, write, buffer, lenp, ppos);
67
68 if (write && ret == 0) {
69 if (range[1] < range[0])
70 ret = -EINVAL;
71 else
72 set_local_port_range(range);
73 }
74
75 return ret;
76}
77
78
79static void inet_get_ping_group_range_table(struct ctl_table *table, gid_t *low, gid_t *high)
80{
81 gid_t *data = table->data;
82 unsigned int seq;
83 do {
84 seq = read_seqbegin(&sysctl_local_ports.lock);
85
86 *low = data[0];
87 *high = data[1];
88 } while (read_seqretry(&sysctl_local_ports.lock, seq));
89}
90
91/* Update system visible IP port range */
92static void set_ping_group_range(struct ctl_table *table, gid_t range[2])
93{
94 gid_t *data = table->data;
95 write_seqlock(&sysctl_local_ports.lock);
96 data[0] = range[0];
97 data[1] = range[1];
98 write_sequnlock(&sysctl_local_ports.lock);
99}
100
101/* Validate changes from /proc interface. */
102static int ipv4_ping_group_range(ctl_table *table, int write,
103 void __user *buffer,
104 size_t *lenp, loff_t *ppos)
105{
106 int ret;
107 gid_t range[2];
108 ctl_table tmp = {
109 .data = &range,
110 .maxlen = sizeof(range),
111 .mode = table->mode,
112 .extra1 = &ip_ping_group_range_min,
113 .extra2 = &ip_ping_group_range_max,
114 };
115
116 inet_get_ping_group_range_table(table, range, range + 1);
117 ret = proc_dointvec_minmax(&tmp, write, buffer, lenp, ppos);
118
119 if (write && ret == 0)
120 set_ping_group_range(table, range);
121
122 return ret;
123}
124
125static int proc_tcp_congestion_control(ctl_table *ctl, int write,
126 void __user *buffer, size_t *lenp, loff_t *ppos)
127{
128 char val[TCP_CA_NAME_MAX];
129 ctl_table tbl = {
130 .data = val,
131 .maxlen = TCP_CA_NAME_MAX,
132 };
133 int ret;
134
135 tcp_get_default_congestion_control(val);
136
137 ret = proc_dostring(&tbl, write, buffer, lenp, ppos);
138 if (write && ret == 0)
139 ret = tcp_set_default_congestion_control(val);
140 return ret;
141}
142
143static int proc_tcp_available_congestion_control(ctl_table *ctl,
144 int write,
145 void __user *buffer, size_t *lenp,
146 loff_t *ppos)
147{
148 ctl_table tbl = { .maxlen = TCP_CA_BUF_MAX, };
149 int ret;
150
151 tbl.data = kmalloc(tbl.maxlen, GFP_USER);
152 if (!tbl.data)
153 return -ENOMEM;
154 tcp_get_available_congestion_control(tbl.data, TCP_CA_BUF_MAX);
155 ret = proc_dostring(&tbl, write, buffer, lenp, ppos);
156 kfree(tbl.data);
157 return ret;
158}
159
160static int proc_allowed_congestion_control(ctl_table *ctl,
161 int write,
162 void __user *buffer, size_t *lenp,
163 loff_t *ppos)
164{
165 ctl_table tbl = { .maxlen = TCP_CA_BUF_MAX };
166 int ret;
167
168 tbl.data = kmalloc(tbl.maxlen, GFP_USER);
169 if (!tbl.data)
170 return -ENOMEM;
171
172 tcp_get_allowed_congestion_control(tbl.data, tbl.maxlen);
173 ret = proc_dostring(&tbl, write, buffer, lenp, ppos);
174 if (write && ret == 0)
175 ret = tcp_set_allowed_congestion_control(tbl.data);
176 kfree(tbl.data);
177 return ret;
178}
179
180static int ipv4_tcp_mem(ctl_table *ctl, int write,
181 void __user *buffer, size_t *lenp,
182 loff_t *ppos)
183{
184 int ret;
185 unsigned long vec[3];
186 struct net *net = current->nsproxy->net_ns;
187#ifdef CONFIG_CGROUP_MEM_RES_CTLR_KMEM
188 struct mem_cgroup *memcg;
189#endif
190
191 ctl_table tmp = {
192 .data = &vec,
193 .maxlen = sizeof(vec),
194 .mode = ctl->mode,
195 };
196
197 if (!write) {
198 ctl->data = &net->ipv4.sysctl_tcp_mem;
199 return proc_doulongvec_minmax(ctl, write, buffer, lenp, ppos);
200 }
201
202 ret = proc_doulongvec_minmax(&tmp, write, buffer, lenp, ppos);
203 if (ret)
204 return ret;
205
206#ifdef CONFIG_CGROUP_MEM_RES_CTLR_KMEM
207 rcu_read_lock();
208 memcg = mem_cgroup_from_task(current);
209
210 tcp_prot_mem(memcg, vec[0], 0);
211 tcp_prot_mem(memcg, vec[1], 1);
212 tcp_prot_mem(memcg, vec[2], 2);
213 rcu_read_unlock();
214#endif
215
216 net->ipv4.sysctl_tcp_mem[0] = vec[0];
217 net->ipv4.sysctl_tcp_mem[1] = vec[1];
218 net->ipv4.sysctl_tcp_mem[2] = vec[2];
219
220 return 0;
221}
222
223static struct ctl_table ipv4_table[] = {
224 {
225 .procname = "tcp_timestamps",
226 .data = &sysctl_tcp_timestamps,
227 .maxlen = sizeof(int),
228 .mode = 0644,
229 .proc_handler = proc_dointvec
230 },
231 {
232 .procname = "tcp_window_scaling",
233 .data = &sysctl_tcp_window_scaling,
234 .maxlen = sizeof(int),
235 .mode = 0644,
236 .proc_handler = proc_dointvec
237 },
238 {
239 .procname = "tcp_sack",
240 .data = &sysctl_tcp_sack,
241 .maxlen = sizeof(int),
242 .mode = 0644,
243 .proc_handler = proc_dointvec
244 },
245 {
246 .procname = "tcp_retrans_collapse",
247 .data = &sysctl_tcp_retrans_collapse,
248 .maxlen = sizeof(int),
249 .mode = 0644,
250 .proc_handler = proc_dointvec
251 },
252 {
253 .procname = "ip_default_ttl",
254 .data = &sysctl_ip_default_ttl,
255 .maxlen = sizeof(int),
256 .mode = 0644,
257 .proc_handler = proc_dointvec_minmax,
258 .extra1 = &ip_ttl_min,
259 .extra2 = &ip_ttl_max,
260 },
261 {
262 .procname = "ip_no_pmtu_disc",
263 .data = &ipv4_config.no_pmtu_disc,
264 .maxlen = sizeof(int),
265 .mode = 0644,
266 .proc_handler = proc_dointvec
267 },
268 {
269 .procname = "ip_nonlocal_bind",
270 .data = &sysctl_ip_nonlocal_bind,
271 .maxlen = sizeof(int),
272 .mode = 0644,
273 .proc_handler = proc_dointvec
274 },
275 {
276 .procname = "tcp_syn_retries",
277 .data = &sysctl_tcp_syn_retries,
278 .maxlen = sizeof(int),
279 .mode = 0644,
280 .proc_handler = proc_dointvec
281 },
282 {
283 .procname = "tcp_synack_retries",
284 .data = &sysctl_tcp_synack_retries,
285 .maxlen = sizeof(int),
286 .mode = 0644,
287 .proc_handler = proc_dointvec
288 },
289 {
290 .procname = "tcp_max_orphans",
291 .data = &sysctl_tcp_max_orphans,
292 .maxlen = sizeof(int),
293 .mode = 0644,
294 .proc_handler = proc_dointvec
295 },
296 {
297 .procname = "tcp_max_tw_buckets",
298 .data = &tcp_death_row.sysctl_max_tw_buckets,
299 .maxlen = sizeof(int),
300 .mode = 0644,
301 .proc_handler = proc_dointvec
302 },
303 {
304 .procname = "ip_dynaddr",
305 .data = &sysctl_ip_dynaddr,
306 .maxlen = sizeof(int),
307 .mode = 0644,
308 .proc_handler = proc_dointvec
309 },
310 {
311 .procname = "tcp_keepalive_time",
312 .data = &sysctl_tcp_keepalive_time,
313 .maxlen = sizeof(int),
314 .mode = 0644,
315 .proc_handler = proc_dointvec_jiffies,
316 },
317 {
318 .procname = "tcp_keepalive_probes",
319 .data = &sysctl_tcp_keepalive_probes,
320 .maxlen = sizeof(int),
321 .mode = 0644,
322 .proc_handler = proc_dointvec
323 },
324 {
325 .procname = "tcp_keepalive_intvl",
326 .data = &sysctl_tcp_keepalive_intvl,
327 .maxlen = sizeof(int),
328 .mode = 0644,
329 .proc_handler = proc_dointvec_jiffies,
330 },
331 {
332 .procname = "tcp_retries1",
333 .data = &sysctl_tcp_retries1,
334 .maxlen = sizeof(int),
335 .mode = 0644,
336 .proc_handler = proc_dointvec_minmax,
337 .extra2 = &tcp_retr1_max
338 },
339 {
340 .procname = "tcp_retries2",
341 .data = &sysctl_tcp_retries2,
342 .maxlen = sizeof(int),
343 .mode = 0644,
344 .proc_handler = proc_dointvec
345 },
346 {
347 .procname = "tcp_fin_timeout",
348 .data = &sysctl_tcp_fin_timeout,
349 .maxlen = sizeof(int),
350 .mode = 0644,
351 .proc_handler = proc_dointvec_jiffies,
352 },
353#ifdef CONFIG_SYN_COOKIES
354 {
355 .procname = "tcp_syncookies",
356 .data = &sysctl_tcp_syncookies,
357 .maxlen = sizeof(int),
358 .mode = 0644,
359 .proc_handler = proc_dointvec
360 },
361#endif
362 {
363 .procname = "tcp_tw_recycle",
364 .data = &tcp_death_row.sysctl_tw_recycle,
365 .maxlen = sizeof(int),
366 .mode = 0644,
367 .proc_handler = proc_dointvec
368 },
369 {
370 .procname = "tcp_abort_on_overflow",
371 .data = &sysctl_tcp_abort_on_overflow,
372 .maxlen = sizeof(int),
373 .mode = 0644,
374 .proc_handler = proc_dointvec
375 },
376 {
377 .procname = "tcp_stdurg",
378 .data = &sysctl_tcp_stdurg,
379 .maxlen = sizeof(int),
380 .mode = 0644,
381 .proc_handler = proc_dointvec
382 },
383 {
384 .procname = "tcp_rfc1337",
385 .data = &sysctl_tcp_rfc1337,
386 .maxlen = sizeof(int),
387 .mode = 0644,
388 .proc_handler = proc_dointvec
389 },
390 {
391 .procname = "tcp_max_syn_backlog",
392 .data = &sysctl_max_syn_backlog,
393 .maxlen = sizeof(int),
394 .mode = 0644,
395 .proc_handler = proc_dointvec
396 },
397 {
398 .procname = "ip_local_port_range",
399 .data = &sysctl_local_ports.range,
400 .maxlen = sizeof(sysctl_local_ports.range),
401 .mode = 0644,
402 .proc_handler = ipv4_local_port_range,
403 },
404 {
405 .procname = "ip_local_reserved_ports",
406 .data = NULL, /* initialized in sysctl_ipv4_init */
407 .maxlen = 65536,
408 .mode = 0644,
409 .proc_handler = proc_do_large_bitmap,
410 },
411 {
412 .procname = "igmp_max_memberships",
413 .data = &sysctl_igmp_max_memberships,
414 .maxlen = sizeof(int),
415 .mode = 0644,
416 .proc_handler = proc_dointvec
417 },
418 {
419 .procname = "igmp_max_msf",
420 .data = &sysctl_igmp_max_msf,
421 .maxlen = sizeof(int),
422 .mode = 0644,
423 .proc_handler = proc_dointvec
424 },
425 {
426 .procname = "inet_peer_threshold",
427 .data = &inet_peer_threshold,
428 .maxlen = sizeof(int),
429 .mode = 0644,
430 .proc_handler = proc_dointvec
431 },
432 {
433 .procname = "inet_peer_minttl",
434 .data = &inet_peer_minttl,
435 .maxlen = sizeof(int),
436 .mode = 0644,
437 .proc_handler = proc_dointvec_jiffies,
438 },
439 {
440 .procname = "inet_peer_maxttl",
441 .data = &inet_peer_maxttl,
442 .maxlen = sizeof(int),
443 .mode = 0644,
444 .proc_handler = proc_dointvec_jiffies,
445 },
446 {
447 .procname = "tcp_orphan_retries",
448 .data = &sysctl_tcp_orphan_retries,
449 .maxlen = sizeof(int),
450 .mode = 0644,
451 .proc_handler = proc_dointvec
452 },
453 {
454 .procname = "tcp_fack",
455 .data = &sysctl_tcp_fack,
456 .maxlen = sizeof(int),
457 .mode = 0644,
458 .proc_handler = proc_dointvec
459 },
460 {
461 .procname = "tcp_reordering",
462 .data = &sysctl_tcp_reordering,
463 .maxlen = sizeof(int),
464 .mode = 0644,
465 .proc_handler = proc_dointvec
466 },
467 {
468 .procname = "tcp_ecn",
469 .data = &sysctl_tcp_ecn,
470 .maxlen = sizeof(int),
471 .mode = 0644,
472 .proc_handler = proc_dointvec
473 },
474 {
475 .procname = "tcp_dsack",
476 .data = &sysctl_tcp_dsack,
477 .maxlen = sizeof(int),
478 .mode = 0644,
479 .proc_handler = proc_dointvec
480 },
481 {
482 .procname = "tcp_wmem",
483 .data = &sysctl_tcp_wmem,
484 .maxlen = sizeof(sysctl_tcp_wmem),
485 .mode = 0644,
486 .proc_handler = proc_dointvec
487 },
488 {
489 .procname = "tcp_rmem",
490 .data = &sysctl_tcp_rmem,
491 .maxlen = sizeof(sysctl_tcp_rmem),
492 .mode = 0644,
493 .proc_handler = proc_dointvec
494 },
495 {
496 .procname = "tcp_app_win",
497 .data = &sysctl_tcp_app_win,
498 .maxlen = sizeof(int),
499 .mode = 0644,
500 .proc_handler = proc_dointvec
501 },
502 {
503 .procname = "tcp_adv_win_scale",
504 .data = &sysctl_tcp_adv_win_scale,
505 .maxlen = sizeof(int),
506 .mode = 0644,
507 .proc_handler = proc_dointvec_minmax,
508 .extra1 = &tcp_adv_win_scale_min,
509 .extra2 = &tcp_adv_win_scale_max,
510 },
511 {
512 .procname = "tcp_tw_reuse",
513 .data = &sysctl_tcp_tw_reuse,
514 .maxlen = sizeof(int),
515 .mode = 0644,
516 .proc_handler = proc_dointvec
517 },
518 {
519 .procname = "tcp_frto",
520 .data = &sysctl_tcp_frto,
521 .maxlen = sizeof(int),
522 .mode = 0644,
523 .proc_handler = proc_dointvec
524 },
525 {
526 .procname = "tcp_frto_response",
527 .data = &sysctl_tcp_frto_response,
528 .maxlen = sizeof(int),
529 .mode = 0644,
530 .proc_handler = proc_dointvec
531 },
532 {
533 .procname = "tcp_low_latency",
534 .data = &sysctl_tcp_low_latency,
535 .maxlen = sizeof(int),
536 .mode = 0644,
537 .proc_handler = proc_dointvec
538 },
539 {
540 .procname = "tcp_no_metrics_save",
541 .data = &sysctl_tcp_nometrics_save,
542 .maxlen = sizeof(int),
543 .mode = 0644,
544 .proc_handler = proc_dointvec,
545 },
546 {
547 .procname = "tcp_moderate_rcvbuf",
548 .data = &sysctl_tcp_moderate_rcvbuf,
549 .maxlen = sizeof(int),
550 .mode = 0644,
551 .proc_handler = proc_dointvec,
552 },
553 {
554 .procname = "tcp_tso_win_divisor",
555 .data = &sysctl_tcp_tso_win_divisor,
556 .maxlen = sizeof(int),
557 .mode = 0644,
558 .proc_handler = proc_dointvec,
559 },
560 {
561 .procname = "tcp_congestion_control",
562 .mode = 0644,
563 .maxlen = TCP_CA_NAME_MAX,
564 .proc_handler = proc_tcp_congestion_control,
565 },
566 {
567 .procname = "tcp_abc",
568 .data = &sysctl_tcp_abc,
569 .maxlen = sizeof(int),
570 .mode = 0644,
571 .proc_handler = proc_dointvec,
572 },
573 {
574 .procname = "tcp_mtu_probing",
575 .data = &sysctl_tcp_mtu_probing,
576 .maxlen = sizeof(int),
577 .mode = 0644,
578 .proc_handler = proc_dointvec,
579 },
580 {
581 .procname = "tcp_base_mss",
582 .data = &sysctl_tcp_base_mss,
583 .maxlen = sizeof(int),
584 .mode = 0644,
585 .proc_handler = proc_dointvec,
586 },
587 {
588 .procname = "tcp_workaround_signed_windows",
589 .data = &sysctl_tcp_workaround_signed_windows,
590 .maxlen = sizeof(int),
591 .mode = 0644,
592 .proc_handler = proc_dointvec
593 },
594#ifdef CONFIG_NET_DMA
595 {
596 .procname = "tcp_dma_copybreak",
597 .data = &sysctl_tcp_dma_copybreak,
598 .maxlen = sizeof(int),
599 .mode = 0644,
600 .proc_handler = proc_dointvec
601 },
602#endif
603 {
604 .procname = "tcp_slow_start_after_idle",
605 .data = &sysctl_tcp_slow_start_after_idle,
606 .maxlen = sizeof(int),
607 .mode = 0644,
608 .proc_handler = proc_dointvec
609 },
610#ifdef CONFIG_NETLABEL
611 {
612 .procname = "cipso_cache_enable",
613 .data = &cipso_v4_cache_enabled,
614 .maxlen = sizeof(int),
615 .mode = 0644,
616 .proc_handler = proc_dointvec,
617 },
618 {
619 .procname = "cipso_cache_bucket_size",
620 .data = &cipso_v4_cache_bucketsize,
621 .maxlen = sizeof(int),
622 .mode = 0644,
623 .proc_handler = proc_dointvec,
624 },
625 {
626 .procname = "cipso_rbm_optfmt",
627 .data = &cipso_v4_rbm_optfmt,
628 .maxlen = sizeof(int),
629 .mode = 0644,
630 .proc_handler = proc_dointvec,
631 },
632 {
633 .procname = "cipso_rbm_strictvalid",
634 .data = &cipso_v4_rbm_strictvalid,
635 .maxlen = sizeof(int),
636 .mode = 0644,
637 .proc_handler = proc_dointvec,
638 },
639#endif /* CONFIG_NETLABEL */
640 {
641 .procname = "tcp_available_congestion_control",
642 .maxlen = TCP_CA_BUF_MAX,
643 .mode = 0444,
644 .proc_handler = proc_tcp_available_congestion_control,
645 },
646 {
647 .procname = "tcp_allowed_congestion_control",
648 .maxlen = TCP_CA_BUF_MAX,
649 .mode = 0644,
650 .proc_handler = proc_allowed_congestion_control,
651 },
652 {
653 .procname = "tcp_max_ssthresh",
654 .data = &sysctl_tcp_max_ssthresh,
655 .maxlen = sizeof(int),
656 .mode = 0644,
657 .proc_handler = proc_dointvec,
658 },
659 {
660 .procname = "tcp_cookie_size",
661 .data = &sysctl_tcp_cookie_size,
662 .maxlen = sizeof(int),
663 .mode = 0644,
664 .proc_handler = proc_dointvec
665 },
666 {
667 .procname = "tcp_thin_linear_timeouts",
668 .data = &sysctl_tcp_thin_linear_timeouts,
669 .maxlen = sizeof(int),
670 .mode = 0644,
671 .proc_handler = proc_dointvec
672 },
673 {
674 .procname = "tcp_thin_dupack",
675 .data = &sysctl_tcp_thin_dupack,
676 .maxlen = sizeof(int),
677 .mode = 0644,
678 .proc_handler = proc_dointvec
679 },
680 {
681 .procname = "tcp_early_retrans",
682 .data = &sysctl_tcp_early_retrans,
683 .maxlen = sizeof(int),
684 .mode = 0644,
685 .proc_handler = proc_dointvec_minmax,
686 .extra1 = &zero,
687 .extra2 = &two,
688 },
689 {
690 .procname = "udp_mem",
691 .data = &sysctl_udp_mem,
692 .maxlen = sizeof(sysctl_udp_mem),
693 .mode = 0644,
694 .proc_handler = proc_doulongvec_minmax,
695 },
696 {
697 .procname = "udp_rmem_min",
698 .data = &sysctl_udp_rmem_min,
699 .maxlen = sizeof(sysctl_udp_rmem_min),
700 .mode = 0644,
701 .proc_handler = proc_dointvec_minmax,
702 .extra1 = &zero
703 },
704 {
705 .procname = "udp_wmem_min",
706 .data = &sysctl_udp_wmem_min,
707 .maxlen = sizeof(sysctl_udp_wmem_min),
708 .mode = 0644,
709 .proc_handler = proc_dointvec_minmax,
710 .extra1 = &zero
711 },
712 { }
713};
714
715static struct ctl_table ipv4_net_table[] = {
716 {
717 .procname = "icmp_echo_ignore_all",
718 .data = &init_net.ipv4.sysctl_icmp_echo_ignore_all,
719 .maxlen = sizeof(int),
720 .mode = 0644,
721 .proc_handler = proc_dointvec
722 },
723 {
724 .procname = "icmp_echo_ignore_broadcasts",
725 .data = &init_net.ipv4.sysctl_icmp_echo_ignore_broadcasts,
726 .maxlen = sizeof(int),
727 .mode = 0644,
728 .proc_handler = proc_dointvec
729 },
730 {
731 .procname = "icmp_ignore_bogus_error_responses",
732 .data = &init_net.ipv4.sysctl_icmp_ignore_bogus_error_responses,
733 .maxlen = sizeof(int),
734 .mode = 0644,
735 .proc_handler = proc_dointvec
736 },
737 {
738 .procname = "icmp_errors_use_inbound_ifaddr",
739 .data = &init_net.ipv4.sysctl_icmp_errors_use_inbound_ifaddr,
740 .maxlen = sizeof(int),
741 .mode = 0644,
742 .proc_handler = proc_dointvec
743 },
744 {
745 .procname = "icmp_ratelimit",
746 .data = &init_net.ipv4.sysctl_icmp_ratelimit,
747 .maxlen = sizeof(int),
748 .mode = 0644,
749 .proc_handler = proc_dointvec_ms_jiffies,
750 },
751 {
752 .procname = "icmp_ratemask",
753 .data = &init_net.ipv4.sysctl_icmp_ratemask,
754 .maxlen = sizeof(int),
755 .mode = 0644,
756 .proc_handler = proc_dointvec
757 },
758 {
759 .procname = "rt_cache_rebuild_count",
760 .data = &init_net.ipv4.sysctl_rt_cache_rebuild_count,
761 .maxlen = sizeof(int),
762 .mode = 0644,
763 .proc_handler = proc_dointvec
764 },
765 {
766 .procname = "ping_group_range",
767 .data = &init_net.ipv4.sysctl_ping_group_range,
768 .maxlen = sizeof(init_net.ipv4.sysctl_ping_group_range),
769 .mode = 0644,
770 .proc_handler = ipv4_ping_group_range,
771 },
772 {
773 .procname = "tcp_mem",
774 .maxlen = sizeof(init_net.ipv4.sysctl_tcp_mem),
775 .mode = 0644,
776 .proc_handler = ipv4_tcp_mem,
777 },
778 { }
779};
780
781static __net_init int ipv4_sysctl_init_net(struct net *net)
782{
783 struct ctl_table *table;
784
785 table = ipv4_net_table;
786 if (!net_eq(net, &init_net)) {
787 table = kmemdup(table, sizeof(ipv4_net_table), GFP_KERNEL);
788 if (table == NULL)
789 goto err_alloc;
790
791 table[0].data =
792 &net->ipv4.sysctl_icmp_echo_ignore_all;
793 table[1].data =
794 &net->ipv4.sysctl_icmp_echo_ignore_broadcasts;
795 table[2].data =
796 &net->ipv4.sysctl_icmp_ignore_bogus_error_responses;
797 table[3].data =
798 &net->ipv4.sysctl_icmp_errors_use_inbound_ifaddr;
799 table[4].data =
800 &net->ipv4.sysctl_icmp_ratelimit;
801 table[5].data =
802 &net->ipv4.sysctl_icmp_ratemask;
803 table[6].data =
804 &net->ipv4.sysctl_rt_cache_rebuild_count;
805 table[7].data =
806 &net->ipv4.sysctl_ping_group_range;
807
808 }
809
810 /*
811 * Sane defaults - nobody may create ping sockets.
812 * Boot scripts should set this to distro-specific group.
813 */
814 net->ipv4.sysctl_ping_group_range[0] = 1;
815 net->ipv4.sysctl_ping_group_range[1] = 0;
816
817 net->ipv4.sysctl_rt_cache_rebuild_count = 4;
818
819 tcp_init_mem(net);
820
821 net->ipv4.ipv4_hdr = register_net_sysctl(net, "net/ipv4", table);
822 if (net->ipv4.ipv4_hdr == NULL)
823 goto err_reg;
824
825 return 0;
826
827err_reg:
828 if (!net_eq(net, &init_net))
829 kfree(table);
830err_alloc:
831 return -ENOMEM;
832}
833
834static __net_exit void ipv4_sysctl_exit_net(struct net *net)
835{
836 struct ctl_table *table;
837
838 table = net->ipv4.ipv4_hdr->ctl_table_arg;
839 unregister_net_sysctl_table(net->ipv4.ipv4_hdr);
840 kfree(table);
841}
842
843static __net_initdata struct pernet_operations ipv4_sysctl_ops = {
844 .init = ipv4_sysctl_init_net,
845 .exit = ipv4_sysctl_exit_net,
846};
847
848static __init int sysctl_ipv4_init(void)
849{
850 struct ctl_table_header *hdr;
851 struct ctl_table *i;
852
853 for (i = ipv4_table; i->procname; i++) {
854 if (strcmp(i->procname, "ip_local_reserved_ports") == 0) {
855 i->data = sysctl_local_reserved_ports;
856 break;
857 }
858 }
859 if (!i->procname)
860 return -EINVAL;
861
862 hdr = register_net_sysctl(&init_net, "net/ipv4", ipv4_table);
863 if (hdr == NULL)
864 return -ENOMEM;
865
866 if (register_pernet_subsys(&ipv4_sysctl_ops)) {
867 unregister_net_sysctl_table(hdr);
868 return -ENOMEM;
869 }
870
871 return 0;
872}
873
874__initcall(sysctl_ipv4_init);