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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// SPDX-License-Identifier: GPL-2.0
2/*
3 * sysctl_net_ipv4.c: sysctl interface to net IPV4 subsystem.
4 *
5 * Begun April 1, 1996, Mike Shaver.
6 * Added /proc/sys/net/ipv4 directory entry (empty =) ). [MS]
7 */
8
9#include <linux/mm.h>
10#include <linux/module.h>
11#include <linux/sysctl.h>
12#include <linux/igmp.h>
13#include <linux/inetdevice.h>
14#include <linux/seqlock.h>
15#include <linux/init.h>
16#include <linux/slab.h>
17#include <linux/nsproxy.h>
18#include <linux/swap.h>
19#include <net/snmp.h>
20#include <net/icmp.h>
21#include <net/ip.h>
22#include <net/route.h>
23#include <net/tcp.h>
24#include <net/udp.h>
25#include <net/cipso_ipv4.h>
26#include <net/inet_frag.h>
27#include <net/ping.h>
28#include <net/protocol.h>
29#include <net/netevent.h>
30
31static int two = 2;
32static int four = 4;
33static int thousand = 1000;
34static int gso_max_segs = GSO_MAX_SEGS;
35static int tcp_retr1_max = 255;
36static int ip_local_port_range_min[] = { 1, 1 };
37static int ip_local_port_range_max[] = { 65535, 65535 };
38static int tcp_adv_win_scale_min = -31;
39static int tcp_adv_win_scale_max = 31;
40static int tcp_min_snd_mss_min = TCP_MIN_SND_MSS;
41static int tcp_min_snd_mss_max = 65535;
42static int ip_privileged_port_min;
43static int ip_privileged_port_max = 65535;
44static int ip_ttl_min = 1;
45static int ip_ttl_max = 255;
46static int tcp_syn_retries_min = 1;
47static int tcp_syn_retries_max = MAX_TCP_SYNCNT;
48static int ip_ping_group_range_min[] = { 0, 0 };
49static int ip_ping_group_range_max[] = { GID_T_MAX, GID_T_MAX };
50static int comp_sack_nr_max = 255;
51static u32 u32_max_div_HZ = UINT_MAX / HZ;
52static int one_day_secs = 24 * 3600;
53
54/* obsolete */
55static int sysctl_tcp_low_latency __read_mostly;
56
57/* Update system visible IP port range */
58static void set_local_port_range(struct net *net, int range[2])
59{
60 bool same_parity = !((range[0] ^ range[1]) & 1);
61
62 write_seqlock_bh(&net->ipv4.ip_local_ports.lock);
63 if (same_parity && !net->ipv4.ip_local_ports.warned) {
64 net->ipv4.ip_local_ports.warned = true;
65 pr_err_ratelimited("ip_local_port_range: prefer different parity for start/end values.\n");
66 }
67 net->ipv4.ip_local_ports.range[0] = range[0];
68 net->ipv4.ip_local_ports.range[1] = range[1];
69 write_sequnlock_bh(&net->ipv4.ip_local_ports.lock);
70}
71
72/* Validate changes from /proc interface. */
73static int ipv4_local_port_range(struct ctl_table *table, int write,
74 void *buffer, size_t *lenp, loff_t *ppos)
75{
76 struct net *net =
77 container_of(table->data, struct net, ipv4.ip_local_ports.range);
78 int ret;
79 int range[2];
80 struct ctl_table tmp = {
81 .data = &range,
82 .maxlen = sizeof(range),
83 .mode = table->mode,
84 .extra1 = &ip_local_port_range_min,
85 .extra2 = &ip_local_port_range_max,
86 };
87
88 inet_get_local_port_range(net, &range[0], &range[1]);
89
90 ret = proc_dointvec_minmax(&tmp, write, buffer, lenp, ppos);
91
92 if (write && ret == 0) {
93 /* Ensure that the upper limit is not smaller than the lower,
94 * and that the lower does not encroach upon the privileged
95 * port limit.
96 */
97 if ((range[1] < range[0]) ||
98 (range[0] < net->ipv4.sysctl_ip_prot_sock))
99 ret = -EINVAL;
100 else
101 set_local_port_range(net, range);
102 }
103
104 return ret;
105}
106
107/* Validate changes from /proc interface. */
108static int ipv4_privileged_ports(struct ctl_table *table, int write,
109 void *buffer, size_t *lenp, loff_t *ppos)
110{
111 struct net *net = container_of(table->data, struct net,
112 ipv4.sysctl_ip_prot_sock);
113 int ret;
114 int pports;
115 int range[2];
116 struct ctl_table tmp = {
117 .data = &pports,
118 .maxlen = sizeof(pports),
119 .mode = table->mode,
120 .extra1 = &ip_privileged_port_min,
121 .extra2 = &ip_privileged_port_max,
122 };
123
124 pports = net->ipv4.sysctl_ip_prot_sock;
125
126 ret = proc_dointvec_minmax(&tmp, write, buffer, lenp, ppos);
127
128 if (write && ret == 0) {
129 inet_get_local_port_range(net, &range[0], &range[1]);
130 /* Ensure that the local port range doesn't overlap with the
131 * privileged port range.
132 */
133 if (range[0] < pports)
134 ret = -EINVAL;
135 else
136 net->ipv4.sysctl_ip_prot_sock = pports;
137 }
138
139 return ret;
140}
141
142static void inet_get_ping_group_range_table(struct ctl_table *table, kgid_t *low, kgid_t *high)
143{
144 kgid_t *data = table->data;
145 struct net *net =
146 container_of(table->data, struct net, ipv4.ping_group_range.range);
147 unsigned int seq;
148 do {
149 seq = read_seqbegin(&net->ipv4.ping_group_range.lock);
150
151 *low = data[0];
152 *high = data[1];
153 } while (read_seqretry(&net->ipv4.ping_group_range.lock, seq));
154}
155
156/* Update system visible IP port range */
157static void set_ping_group_range(struct ctl_table *table, kgid_t low, kgid_t high)
158{
159 kgid_t *data = table->data;
160 struct net *net =
161 container_of(table->data, struct net, ipv4.ping_group_range.range);
162 write_seqlock(&net->ipv4.ping_group_range.lock);
163 data[0] = low;
164 data[1] = high;
165 write_sequnlock(&net->ipv4.ping_group_range.lock);
166}
167
168/* Validate changes from /proc interface. */
169static int ipv4_ping_group_range(struct ctl_table *table, int write,
170 void *buffer, size_t *lenp, loff_t *ppos)
171{
172 struct user_namespace *user_ns = current_user_ns();
173 int ret;
174 gid_t urange[2];
175 kgid_t low, high;
176 struct ctl_table tmp = {
177 .data = &urange,
178 .maxlen = sizeof(urange),
179 .mode = table->mode,
180 .extra1 = &ip_ping_group_range_min,
181 .extra2 = &ip_ping_group_range_max,
182 };
183
184 inet_get_ping_group_range_table(table, &low, &high);
185 urange[0] = from_kgid_munged(user_ns, low);
186 urange[1] = from_kgid_munged(user_ns, high);
187 ret = proc_dointvec_minmax(&tmp, write, buffer, lenp, ppos);
188
189 if (write && ret == 0) {
190 low = make_kgid(user_ns, urange[0]);
191 high = make_kgid(user_ns, urange[1]);
192 if (!gid_valid(low) || !gid_valid(high))
193 return -EINVAL;
194 if (urange[1] < urange[0] || gid_lt(high, low)) {
195 low = make_kgid(&init_user_ns, 1);
196 high = make_kgid(&init_user_ns, 0);
197 }
198 set_ping_group_range(table, low, high);
199 }
200
201 return ret;
202}
203
204static int ipv4_fwd_update_priority(struct ctl_table *table, int write,
205 void *buffer, size_t *lenp, loff_t *ppos)
206{
207 struct net *net;
208 int ret;
209
210 net = container_of(table->data, struct net,
211 ipv4.sysctl_ip_fwd_update_priority);
212 ret = proc_dointvec_minmax(table, write, buffer, lenp, ppos);
213 if (write && ret == 0)
214 call_netevent_notifiers(NETEVENT_IPV4_FWD_UPDATE_PRIORITY_UPDATE,
215 net);
216
217 return ret;
218}
219
220static int proc_tcp_congestion_control(struct ctl_table *ctl, int write,
221 void *buffer, size_t *lenp, loff_t *ppos)
222{
223 struct net *net = container_of(ctl->data, struct net,
224 ipv4.tcp_congestion_control);
225 char val[TCP_CA_NAME_MAX];
226 struct ctl_table tbl = {
227 .data = val,
228 .maxlen = TCP_CA_NAME_MAX,
229 };
230 int ret;
231
232 tcp_get_default_congestion_control(net, val);
233
234 ret = proc_dostring(&tbl, write, buffer, lenp, ppos);
235 if (write && ret == 0)
236 ret = tcp_set_default_congestion_control(net, val);
237 return ret;
238}
239
240static int proc_tcp_available_congestion_control(struct ctl_table *ctl,
241 int write, void *buffer,
242 size_t *lenp, loff_t *ppos)
243{
244 struct ctl_table tbl = { .maxlen = TCP_CA_BUF_MAX, };
245 int ret;
246
247 tbl.data = kmalloc(tbl.maxlen, GFP_USER);
248 if (!tbl.data)
249 return -ENOMEM;
250 tcp_get_available_congestion_control(tbl.data, TCP_CA_BUF_MAX);
251 ret = proc_dostring(&tbl, write, buffer, lenp, ppos);
252 kfree(tbl.data);
253 return ret;
254}
255
256static int proc_allowed_congestion_control(struct ctl_table *ctl,
257 int write, void *buffer,
258 size_t *lenp, loff_t *ppos)
259{
260 struct ctl_table tbl = { .maxlen = TCP_CA_BUF_MAX };
261 int ret;
262
263 tbl.data = kmalloc(tbl.maxlen, GFP_USER);
264 if (!tbl.data)
265 return -ENOMEM;
266
267 tcp_get_allowed_congestion_control(tbl.data, tbl.maxlen);
268 ret = proc_dostring(&tbl, write, buffer, lenp, ppos);
269 if (write && ret == 0)
270 ret = tcp_set_allowed_congestion_control(tbl.data);
271 kfree(tbl.data);
272 return ret;
273}
274
275static int sscanf_key(char *buf, __le32 *key)
276{
277 u32 user_key[4];
278 int i, ret = 0;
279
280 if (sscanf(buf, "%x-%x-%x-%x", user_key, user_key + 1,
281 user_key + 2, user_key + 3) != 4) {
282 ret = -EINVAL;
283 } else {
284 for (i = 0; i < ARRAY_SIZE(user_key); i++)
285 key[i] = cpu_to_le32(user_key[i]);
286 }
287 pr_debug("proc TFO key set 0x%x-%x-%x-%x <- 0x%s: %u\n",
288 user_key[0], user_key[1], user_key[2], user_key[3], buf, ret);
289
290 return ret;
291}
292
293static int proc_tcp_fastopen_key(struct ctl_table *table, int write,
294 void *buffer, size_t *lenp, loff_t *ppos)
295{
296 struct net *net = container_of(table->data, struct net,
297 ipv4.sysctl_tcp_fastopen);
298 /* maxlen to print the list of keys in hex (*2), with dashes
299 * separating doublewords and a comma in between keys.
300 */
301 struct ctl_table tbl = { .maxlen = ((TCP_FASTOPEN_KEY_LENGTH *
302 2 * TCP_FASTOPEN_KEY_MAX) +
303 (TCP_FASTOPEN_KEY_MAX * 5)) };
304 u32 user_key[TCP_FASTOPEN_KEY_BUF_LENGTH / sizeof(u32)];
305 __le32 key[TCP_FASTOPEN_KEY_BUF_LENGTH / sizeof(__le32)];
306 char *backup_data;
307 int ret, i = 0, off = 0, n_keys;
308
309 tbl.data = kmalloc(tbl.maxlen, GFP_KERNEL);
310 if (!tbl.data)
311 return -ENOMEM;
312
313 n_keys = tcp_fastopen_get_cipher(net, NULL, (u64 *)key);
314 if (!n_keys) {
315 memset(&key[0], 0, TCP_FASTOPEN_KEY_LENGTH);
316 n_keys = 1;
317 }
318
319 for (i = 0; i < n_keys * 4; i++)
320 user_key[i] = le32_to_cpu(key[i]);
321
322 for (i = 0; i < n_keys; i++) {
323 off += snprintf(tbl.data + off, tbl.maxlen - off,
324 "%08x-%08x-%08x-%08x",
325 user_key[i * 4],
326 user_key[i * 4 + 1],
327 user_key[i * 4 + 2],
328 user_key[i * 4 + 3]);
329
330 if (WARN_ON_ONCE(off >= tbl.maxlen - 1))
331 break;
332
333 if (i + 1 < n_keys)
334 off += snprintf(tbl.data + off, tbl.maxlen - off, ",");
335 }
336
337 ret = proc_dostring(&tbl, write, buffer, lenp, ppos);
338
339 if (write && ret == 0) {
340 backup_data = strchr(tbl.data, ',');
341 if (backup_data) {
342 *backup_data = '\0';
343 backup_data++;
344 }
345 if (sscanf_key(tbl.data, key)) {
346 ret = -EINVAL;
347 goto bad_key;
348 }
349 if (backup_data) {
350 if (sscanf_key(backup_data, key + 4)) {
351 ret = -EINVAL;
352 goto bad_key;
353 }
354 }
355 tcp_fastopen_reset_cipher(net, NULL, key,
356 backup_data ? key + 4 : NULL);
357 }
358
359bad_key:
360 kfree(tbl.data);
361 return ret;
362}
363
364static void proc_configure_early_demux(int enabled, int protocol)
365{
366 struct net_protocol *ipprot;
367#if IS_ENABLED(CONFIG_IPV6)
368 struct inet6_protocol *ip6prot;
369#endif
370
371 rcu_read_lock();
372
373 ipprot = rcu_dereference(inet_protos[protocol]);
374 if (ipprot)
375 ipprot->early_demux = enabled ? ipprot->early_demux_handler :
376 NULL;
377
378#if IS_ENABLED(CONFIG_IPV6)
379 ip6prot = rcu_dereference(inet6_protos[protocol]);
380 if (ip6prot)
381 ip6prot->early_demux = enabled ? ip6prot->early_demux_handler :
382 NULL;
383#endif
384 rcu_read_unlock();
385}
386
387static int proc_tcp_early_demux(struct ctl_table *table, int write,
388 void *buffer, size_t *lenp, loff_t *ppos)
389{
390 int ret = 0;
391
392 ret = proc_dointvec(table, write, buffer, lenp, ppos);
393
394 if (write && !ret) {
395 int enabled = init_net.ipv4.sysctl_tcp_early_demux;
396
397 proc_configure_early_demux(enabled, IPPROTO_TCP);
398 }
399
400 return ret;
401}
402
403static int proc_udp_early_demux(struct ctl_table *table, int write,
404 void *buffer, size_t *lenp, loff_t *ppos)
405{
406 int ret = 0;
407
408 ret = proc_dointvec(table, write, buffer, lenp, ppos);
409
410 if (write && !ret) {
411 int enabled = init_net.ipv4.sysctl_udp_early_demux;
412
413 proc_configure_early_demux(enabled, IPPROTO_UDP);
414 }
415
416 return ret;
417}
418
419static int proc_tfo_blackhole_detect_timeout(struct ctl_table *table,
420 int write, void *buffer,
421 size_t *lenp, loff_t *ppos)
422{
423 struct net *net = container_of(table->data, struct net,
424 ipv4.sysctl_tcp_fastopen_blackhole_timeout);
425 int ret;
426
427 ret = proc_dointvec_minmax(table, write, buffer, lenp, ppos);
428 if (write && ret == 0)
429 atomic_set(&net->ipv4.tfo_active_disable_times, 0);
430
431 return ret;
432}
433
434static int proc_tcp_available_ulp(struct ctl_table *ctl,
435 int write, void *buffer, size_t *lenp,
436 loff_t *ppos)
437{
438 struct ctl_table tbl = { .maxlen = TCP_ULP_BUF_MAX, };
439 int ret;
440
441 tbl.data = kmalloc(tbl.maxlen, GFP_USER);
442 if (!tbl.data)
443 return -ENOMEM;
444 tcp_get_available_ulp(tbl.data, TCP_ULP_BUF_MAX);
445 ret = proc_dostring(&tbl, write, buffer, lenp, ppos);
446 kfree(tbl.data);
447
448 return ret;
449}
450
451#ifdef CONFIG_IP_ROUTE_MULTIPATH
452static int proc_fib_multipath_hash_policy(struct ctl_table *table, int write,
453 void *buffer, size_t *lenp,
454 loff_t *ppos)
455{
456 struct net *net = container_of(table->data, struct net,
457 ipv4.sysctl_fib_multipath_hash_policy);
458 int ret;
459
460 ret = proc_dointvec_minmax(table, write, buffer, lenp, ppos);
461 if (write && ret == 0)
462 call_netevent_notifiers(NETEVENT_IPV4_MPATH_HASH_UPDATE, net);
463
464 return ret;
465}
466#endif
467
468static struct ctl_table ipv4_table[] = {
469 {
470 .procname = "tcp_max_orphans",
471 .data = &sysctl_tcp_max_orphans,
472 .maxlen = sizeof(int),
473 .mode = 0644,
474 .proc_handler = proc_dointvec
475 },
476 {
477 .procname = "inet_peer_threshold",
478 .data = &inet_peer_threshold,
479 .maxlen = sizeof(int),
480 .mode = 0644,
481 .proc_handler = proc_dointvec
482 },
483 {
484 .procname = "inet_peer_minttl",
485 .data = &inet_peer_minttl,
486 .maxlen = sizeof(int),
487 .mode = 0644,
488 .proc_handler = proc_dointvec_jiffies,
489 },
490 {
491 .procname = "inet_peer_maxttl",
492 .data = &inet_peer_maxttl,
493 .maxlen = sizeof(int),
494 .mode = 0644,
495 .proc_handler = proc_dointvec_jiffies,
496 },
497 {
498 .procname = "tcp_mem",
499 .maxlen = sizeof(sysctl_tcp_mem),
500 .data = &sysctl_tcp_mem,
501 .mode = 0644,
502 .proc_handler = proc_doulongvec_minmax,
503 },
504 {
505 .procname = "tcp_low_latency",
506 .data = &sysctl_tcp_low_latency,
507 .maxlen = sizeof(int),
508 .mode = 0644,
509 .proc_handler = proc_dointvec
510 },
511#ifdef CONFIG_NETLABEL
512 {
513 .procname = "cipso_cache_enable",
514 .data = &cipso_v4_cache_enabled,
515 .maxlen = sizeof(int),
516 .mode = 0644,
517 .proc_handler = proc_dointvec,
518 },
519 {
520 .procname = "cipso_cache_bucket_size",
521 .data = &cipso_v4_cache_bucketsize,
522 .maxlen = sizeof(int),
523 .mode = 0644,
524 .proc_handler = proc_dointvec,
525 },
526 {
527 .procname = "cipso_rbm_optfmt",
528 .data = &cipso_v4_rbm_optfmt,
529 .maxlen = sizeof(int),
530 .mode = 0644,
531 .proc_handler = proc_dointvec,
532 },
533 {
534 .procname = "cipso_rbm_strictvalid",
535 .data = &cipso_v4_rbm_strictvalid,
536 .maxlen = sizeof(int),
537 .mode = 0644,
538 .proc_handler = proc_dointvec,
539 },
540#endif /* CONFIG_NETLABEL */
541 {
542 .procname = "tcp_available_ulp",
543 .maxlen = TCP_ULP_BUF_MAX,
544 .mode = 0444,
545 .proc_handler = proc_tcp_available_ulp,
546 },
547 {
548 .procname = "icmp_msgs_per_sec",
549 .data = &sysctl_icmp_msgs_per_sec,
550 .maxlen = sizeof(int),
551 .mode = 0644,
552 .proc_handler = proc_dointvec_minmax,
553 .extra1 = SYSCTL_ZERO,
554 },
555 {
556 .procname = "icmp_msgs_burst",
557 .data = &sysctl_icmp_msgs_burst,
558 .maxlen = sizeof(int),
559 .mode = 0644,
560 .proc_handler = proc_dointvec_minmax,
561 .extra1 = SYSCTL_ZERO,
562 },
563 {
564 .procname = "udp_mem",
565 .data = &sysctl_udp_mem,
566 .maxlen = sizeof(sysctl_udp_mem),
567 .mode = 0644,
568 .proc_handler = proc_doulongvec_minmax,
569 },
570 {
571 .procname = "fib_sync_mem",
572 .data = &sysctl_fib_sync_mem,
573 .maxlen = sizeof(sysctl_fib_sync_mem),
574 .mode = 0644,
575 .proc_handler = proc_douintvec_minmax,
576 .extra1 = &sysctl_fib_sync_mem_min,
577 .extra2 = &sysctl_fib_sync_mem_max,
578 },
579 {
580 .procname = "tcp_rx_skb_cache",
581 .data = &tcp_rx_skb_cache_key.key,
582 .mode = 0644,
583 .proc_handler = proc_do_static_key,
584 },
585 {
586 .procname = "tcp_tx_skb_cache",
587 .data = &tcp_tx_skb_cache_key.key,
588 .mode = 0644,
589 .proc_handler = proc_do_static_key,
590 },
591 { }
592};
593
594static struct ctl_table ipv4_net_table[] = {
595 {
596 .procname = "icmp_echo_ignore_all",
597 .data = &init_net.ipv4.sysctl_icmp_echo_ignore_all,
598 .maxlen = sizeof(int),
599 .mode = 0644,
600 .proc_handler = proc_dointvec
601 },
602 {
603 .procname = "icmp_echo_ignore_broadcasts",
604 .data = &init_net.ipv4.sysctl_icmp_echo_ignore_broadcasts,
605 .maxlen = sizeof(int),
606 .mode = 0644,
607 .proc_handler = proc_dointvec
608 },
609 {
610 .procname = "icmp_ignore_bogus_error_responses",
611 .data = &init_net.ipv4.sysctl_icmp_ignore_bogus_error_responses,
612 .maxlen = sizeof(int),
613 .mode = 0644,
614 .proc_handler = proc_dointvec
615 },
616 {
617 .procname = "icmp_errors_use_inbound_ifaddr",
618 .data = &init_net.ipv4.sysctl_icmp_errors_use_inbound_ifaddr,
619 .maxlen = sizeof(int),
620 .mode = 0644,
621 .proc_handler = proc_dointvec
622 },
623 {
624 .procname = "icmp_ratelimit",
625 .data = &init_net.ipv4.sysctl_icmp_ratelimit,
626 .maxlen = sizeof(int),
627 .mode = 0644,
628 .proc_handler = proc_dointvec_ms_jiffies,
629 },
630 {
631 .procname = "icmp_ratemask",
632 .data = &init_net.ipv4.sysctl_icmp_ratemask,
633 .maxlen = sizeof(int),
634 .mode = 0644,
635 .proc_handler = proc_dointvec
636 },
637 {
638 .procname = "ping_group_range",
639 .data = &init_net.ipv4.ping_group_range.range,
640 .maxlen = sizeof(gid_t)*2,
641 .mode = 0644,
642 .proc_handler = ipv4_ping_group_range,
643 },
644#ifdef CONFIG_NET_L3_MASTER_DEV
645 {
646 .procname = "raw_l3mdev_accept",
647 .data = &init_net.ipv4.sysctl_raw_l3mdev_accept,
648 .maxlen = sizeof(int),
649 .mode = 0644,
650 .proc_handler = proc_dointvec_minmax,
651 .extra1 = SYSCTL_ZERO,
652 .extra2 = SYSCTL_ONE,
653 },
654#endif
655 {
656 .procname = "tcp_ecn",
657 .data = &init_net.ipv4.sysctl_tcp_ecn,
658 .maxlen = sizeof(int),
659 .mode = 0644,
660 .proc_handler = proc_dointvec
661 },
662 {
663 .procname = "tcp_ecn_fallback",
664 .data = &init_net.ipv4.sysctl_tcp_ecn_fallback,
665 .maxlen = sizeof(int),
666 .mode = 0644,
667 .proc_handler = proc_dointvec
668 },
669 {
670 .procname = "ip_dynaddr",
671 .data = &init_net.ipv4.sysctl_ip_dynaddr,
672 .maxlen = sizeof(int),
673 .mode = 0644,
674 .proc_handler = proc_dointvec
675 },
676 {
677 .procname = "ip_early_demux",
678 .data = &init_net.ipv4.sysctl_ip_early_demux,
679 .maxlen = sizeof(int),
680 .mode = 0644,
681 .proc_handler = proc_dointvec
682 },
683 {
684 .procname = "udp_early_demux",
685 .data = &init_net.ipv4.sysctl_udp_early_demux,
686 .maxlen = sizeof(int),
687 .mode = 0644,
688 .proc_handler = proc_udp_early_demux
689 },
690 {
691 .procname = "tcp_early_demux",
692 .data = &init_net.ipv4.sysctl_tcp_early_demux,
693 .maxlen = sizeof(int),
694 .mode = 0644,
695 .proc_handler = proc_tcp_early_demux
696 },
697 {
698 .procname = "nexthop_compat_mode",
699 .data = &init_net.ipv4.sysctl_nexthop_compat_mode,
700 .maxlen = sizeof(int),
701 .mode = 0644,
702 .proc_handler = proc_dointvec_minmax,
703 .extra1 = SYSCTL_ZERO,
704 .extra2 = SYSCTL_ONE,
705 },
706 {
707 .procname = "ip_default_ttl",
708 .data = &init_net.ipv4.sysctl_ip_default_ttl,
709 .maxlen = sizeof(int),
710 .mode = 0644,
711 .proc_handler = proc_dointvec_minmax,
712 .extra1 = &ip_ttl_min,
713 .extra2 = &ip_ttl_max,
714 },
715 {
716 .procname = "ip_local_port_range",
717 .maxlen = sizeof(init_net.ipv4.ip_local_ports.range),
718 .data = &init_net.ipv4.ip_local_ports.range,
719 .mode = 0644,
720 .proc_handler = ipv4_local_port_range,
721 },
722 {
723 .procname = "ip_local_reserved_ports",
724 .data = &init_net.ipv4.sysctl_local_reserved_ports,
725 .maxlen = 65536,
726 .mode = 0644,
727 .proc_handler = proc_do_large_bitmap,
728 },
729 {
730 .procname = "ip_no_pmtu_disc",
731 .data = &init_net.ipv4.sysctl_ip_no_pmtu_disc,
732 .maxlen = sizeof(int),
733 .mode = 0644,
734 .proc_handler = proc_dointvec
735 },
736 {
737 .procname = "ip_forward_use_pmtu",
738 .data = &init_net.ipv4.sysctl_ip_fwd_use_pmtu,
739 .maxlen = sizeof(int),
740 .mode = 0644,
741 .proc_handler = proc_dointvec,
742 },
743 {
744 .procname = "ip_forward_update_priority",
745 .data = &init_net.ipv4.sysctl_ip_fwd_update_priority,
746 .maxlen = sizeof(int),
747 .mode = 0644,
748 .proc_handler = ipv4_fwd_update_priority,
749 .extra1 = SYSCTL_ZERO,
750 .extra2 = SYSCTL_ONE,
751 },
752 {
753 .procname = "ip_nonlocal_bind",
754 .data = &init_net.ipv4.sysctl_ip_nonlocal_bind,
755 .maxlen = sizeof(int),
756 .mode = 0644,
757 .proc_handler = proc_dointvec
758 },
759 {
760 .procname = "ip_autobind_reuse",
761 .data = &init_net.ipv4.sysctl_ip_autobind_reuse,
762 .maxlen = sizeof(int),
763 .mode = 0644,
764 .proc_handler = proc_dointvec_minmax,
765 .extra1 = SYSCTL_ZERO,
766 .extra2 = SYSCTL_ONE,
767 },
768 {
769 .procname = "fwmark_reflect",
770 .data = &init_net.ipv4.sysctl_fwmark_reflect,
771 .maxlen = sizeof(int),
772 .mode = 0644,
773 .proc_handler = proc_dointvec,
774 },
775 {
776 .procname = "tcp_fwmark_accept",
777 .data = &init_net.ipv4.sysctl_tcp_fwmark_accept,
778 .maxlen = sizeof(int),
779 .mode = 0644,
780 .proc_handler = proc_dointvec,
781 },
782#ifdef CONFIG_NET_L3_MASTER_DEV
783 {
784 .procname = "tcp_l3mdev_accept",
785 .data = &init_net.ipv4.sysctl_tcp_l3mdev_accept,
786 .maxlen = sizeof(int),
787 .mode = 0644,
788 .proc_handler = proc_dointvec_minmax,
789 .extra1 = SYSCTL_ZERO,
790 .extra2 = SYSCTL_ONE,
791 },
792#endif
793 {
794 .procname = "tcp_mtu_probing",
795 .data = &init_net.ipv4.sysctl_tcp_mtu_probing,
796 .maxlen = sizeof(int),
797 .mode = 0644,
798 .proc_handler = proc_dointvec,
799 },
800 {
801 .procname = "tcp_base_mss",
802 .data = &init_net.ipv4.sysctl_tcp_base_mss,
803 .maxlen = sizeof(int),
804 .mode = 0644,
805 .proc_handler = proc_dointvec,
806 },
807 {
808 .procname = "tcp_min_snd_mss",
809 .data = &init_net.ipv4.sysctl_tcp_min_snd_mss,
810 .maxlen = sizeof(int),
811 .mode = 0644,
812 .proc_handler = proc_dointvec_minmax,
813 .extra1 = &tcp_min_snd_mss_min,
814 .extra2 = &tcp_min_snd_mss_max,
815 },
816 {
817 .procname = "tcp_mtu_probe_floor",
818 .data = &init_net.ipv4.sysctl_tcp_mtu_probe_floor,
819 .maxlen = sizeof(int),
820 .mode = 0644,
821 .proc_handler = proc_dointvec_minmax,
822 .extra1 = &tcp_min_snd_mss_min,
823 .extra2 = &tcp_min_snd_mss_max,
824 },
825 {
826 .procname = "tcp_probe_threshold",
827 .data = &init_net.ipv4.sysctl_tcp_probe_threshold,
828 .maxlen = sizeof(int),
829 .mode = 0644,
830 .proc_handler = proc_dointvec,
831 },
832 {
833 .procname = "tcp_probe_interval",
834 .data = &init_net.ipv4.sysctl_tcp_probe_interval,
835 .maxlen = sizeof(u32),
836 .mode = 0644,
837 .proc_handler = proc_douintvec_minmax,
838 .extra2 = &u32_max_div_HZ,
839 },
840 {
841 .procname = "igmp_link_local_mcast_reports",
842 .data = &init_net.ipv4.sysctl_igmp_llm_reports,
843 .maxlen = sizeof(int),
844 .mode = 0644,
845 .proc_handler = proc_dointvec
846 },
847 {
848 .procname = "igmp_max_memberships",
849 .data = &init_net.ipv4.sysctl_igmp_max_memberships,
850 .maxlen = sizeof(int),
851 .mode = 0644,
852 .proc_handler = proc_dointvec
853 },
854 {
855 .procname = "igmp_max_msf",
856 .data = &init_net.ipv4.sysctl_igmp_max_msf,
857 .maxlen = sizeof(int),
858 .mode = 0644,
859 .proc_handler = proc_dointvec
860 },
861#ifdef CONFIG_IP_MULTICAST
862 {
863 .procname = "igmp_qrv",
864 .data = &init_net.ipv4.sysctl_igmp_qrv,
865 .maxlen = sizeof(int),
866 .mode = 0644,
867 .proc_handler = proc_dointvec_minmax,
868 .extra1 = SYSCTL_ONE
869 },
870#endif
871 {
872 .procname = "tcp_congestion_control",
873 .data = &init_net.ipv4.tcp_congestion_control,
874 .mode = 0644,
875 .maxlen = TCP_CA_NAME_MAX,
876 .proc_handler = proc_tcp_congestion_control,
877 },
878 {
879 .procname = "tcp_available_congestion_control",
880 .maxlen = TCP_CA_BUF_MAX,
881 .mode = 0444,
882 .proc_handler = proc_tcp_available_congestion_control,
883 },
884 {
885 .procname = "tcp_allowed_congestion_control",
886 .maxlen = TCP_CA_BUF_MAX,
887 .mode = 0644,
888 .proc_handler = proc_allowed_congestion_control,
889 },
890 {
891 .procname = "tcp_keepalive_time",
892 .data = &init_net.ipv4.sysctl_tcp_keepalive_time,
893 .maxlen = sizeof(int),
894 .mode = 0644,
895 .proc_handler = proc_dointvec_jiffies,
896 },
897 {
898 .procname = "tcp_keepalive_probes",
899 .data = &init_net.ipv4.sysctl_tcp_keepalive_probes,
900 .maxlen = sizeof(int),
901 .mode = 0644,
902 .proc_handler = proc_dointvec
903 },
904 {
905 .procname = "tcp_keepalive_intvl",
906 .data = &init_net.ipv4.sysctl_tcp_keepalive_intvl,
907 .maxlen = sizeof(int),
908 .mode = 0644,
909 .proc_handler = proc_dointvec_jiffies,
910 },
911 {
912 .procname = "tcp_syn_retries",
913 .data = &init_net.ipv4.sysctl_tcp_syn_retries,
914 .maxlen = sizeof(int),
915 .mode = 0644,
916 .proc_handler = proc_dointvec_minmax,
917 .extra1 = &tcp_syn_retries_min,
918 .extra2 = &tcp_syn_retries_max
919 },
920 {
921 .procname = "tcp_synack_retries",
922 .data = &init_net.ipv4.sysctl_tcp_synack_retries,
923 .maxlen = sizeof(int),
924 .mode = 0644,
925 .proc_handler = proc_dointvec
926 },
927#ifdef CONFIG_SYN_COOKIES
928 {
929 .procname = "tcp_syncookies",
930 .data = &init_net.ipv4.sysctl_tcp_syncookies,
931 .maxlen = sizeof(int),
932 .mode = 0644,
933 .proc_handler = proc_dointvec
934 },
935#endif
936 {
937 .procname = "tcp_reordering",
938 .data = &init_net.ipv4.sysctl_tcp_reordering,
939 .maxlen = sizeof(int),
940 .mode = 0644,
941 .proc_handler = proc_dointvec
942 },
943 {
944 .procname = "tcp_retries1",
945 .data = &init_net.ipv4.sysctl_tcp_retries1,
946 .maxlen = sizeof(int),
947 .mode = 0644,
948 .proc_handler = proc_dointvec_minmax,
949 .extra2 = &tcp_retr1_max
950 },
951 {
952 .procname = "tcp_retries2",
953 .data = &init_net.ipv4.sysctl_tcp_retries2,
954 .maxlen = sizeof(int),
955 .mode = 0644,
956 .proc_handler = proc_dointvec
957 },
958 {
959 .procname = "tcp_orphan_retries",
960 .data = &init_net.ipv4.sysctl_tcp_orphan_retries,
961 .maxlen = sizeof(int),
962 .mode = 0644,
963 .proc_handler = proc_dointvec
964 },
965 {
966 .procname = "tcp_fin_timeout",
967 .data = &init_net.ipv4.sysctl_tcp_fin_timeout,
968 .maxlen = sizeof(int),
969 .mode = 0644,
970 .proc_handler = proc_dointvec_jiffies,
971 },
972 {
973 .procname = "tcp_notsent_lowat",
974 .data = &init_net.ipv4.sysctl_tcp_notsent_lowat,
975 .maxlen = sizeof(unsigned int),
976 .mode = 0644,
977 .proc_handler = proc_douintvec,
978 },
979 {
980 .procname = "tcp_tw_reuse",
981 .data = &init_net.ipv4.sysctl_tcp_tw_reuse,
982 .maxlen = sizeof(int),
983 .mode = 0644,
984 .proc_handler = proc_dointvec_minmax,
985 .extra1 = SYSCTL_ZERO,
986 .extra2 = &two,
987 },
988 {
989 .procname = "tcp_max_tw_buckets",
990 .data = &init_net.ipv4.tcp_death_row.sysctl_max_tw_buckets,
991 .maxlen = sizeof(int),
992 .mode = 0644,
993 .proc_handler = proc_dointvec
994 },
995 {
996 .procname = "tcp_max_syn_backlog",
997 .data = &init_net.ipv4.sysctl_max_syn_backlog,
998 .maxlen = sizeof(int),
999 .mode = 0644,
1000 .proc_handler = proc_dointvec
1001 },
1002 {
1003 .procname = "tcp_fastopen",
1004 .data = &init_net.ipv4.sysctl_tcp_fastopen,
1005 .maxlen = sizeof(int),
1006 .mode = 0644,
1007 .proc_handler = proc_dointvec,
1008 },
1009 {
1010 .procname = "tcp_fastopen_key",
1011 .mode = 0600,
1012 .data = &init_net.ipv4.sysctl_tcp_fastopen,
1013 /* maxlen to print the list of keys in hex (*2), with dashes
1014 * separating doublewords and a comma in between keys.
1015 */
1016 .maxlen = ((TCP_FASTOPEN_KEY_LENGTH *
1017 2 * TCP_FASTOPEN_KEY_MAX) +
1018 (TCP_FASTOPEN_KEY_MAX * 5)),
1019 .proc_handler = proc_tcp_fastopen_key,
1020 },
1021 {
1022 .procname = "tcp_fastopen_blackhole_timeout_sec",
1023 .data = &init_net.ipv4.sysctl_tcp_fastopen_blackhole_timeout,
1024 .maxlen = sizeof(int),
1025 .mode = 0644,
1026 .proc_handler = proc_tfo_blackhole_detect_timeout,
1027 .extra1 = SYSCTL_ZERO,
1028 },
1029#ifdef CONFIG_IP_ROUTE_MULTIPATH
1030 {
1031 .procname = "fib_multipath_use_neigh",
1032 .data = &init_net.ipv4.sysctl_fib_multipath_use_neigh,
1033 .maxlen = sizeof(int),
1034 .mode = 0644,
1035 .proc_handler = proc_dointvec_minmax,
1036 .extra1 = SYSCTL_ZERO,
1037 .extra2 = SYSCTL_ONE,
1038 },
1039 {
1040 .procname = "fib_multipath_hash_policy",
1041 .data = &init_net.ipv4.sysctl_fib_multipath_hash_policy,
1042 .maxlen = sizeof(int),
1043 .mode = 0644,
1044 .proc_handler = proc_fib_multipath_hash_policy,
1045 .extra1 = SYSCTL_ZERO,
1046 .extra2 = &two,
1047 },
1048#endif
1049 {
1050 .procname = "ip_unprivileged_port_start",
1051 .maxlen = sizeof(int),
1052 .data = &init_net.ipv4.sysctl_ip_prot_sock,
1053 .mode = 0644,
1054 .proc_handler = ipv4_privileged_ports,
1055 },
1056#ifdef CONFIG_NET_L3_MASTER_DEV
1057 {
1058 .procname = "udp_l3mdev_accept",
1059 .data = &init_net.ipv4.sysctl_udp_l3mdev_accept,
1060 .maxlen = sizeof(int),
1061 .mode = 0644,
1062 .proc_handler = proc_dointvec_minmax,
1063 .extra1 = SYSCTL_ZERO,
1064 .extra2 = SYSCTL_ONE,
1065 },
1066#endif
1067 {
1068 .procname = "tcp_sack",
1069 .data = &init_net.ipv4.sysctl_tcp_sack,
1070 .maxlen = sizeof(int),
1071 .mode = 0644,
1072 .proc_handler = proc_dointvec
1073 },
1074 {
1075 .procname = "tcp_window_scaling",
1076 .data = &init_net.ipv4.sysctl_tcp_window_scaling,
1077 .maxlen = sizeof(int),
1078 .mode = 0644,
1079 .proc_handler = proc_dointvec
1080 },
1081 {
1082 .procname = "tcp_timestamps",
1083 .data = &init_net.ipv4.sysctl_tcp_timestamps,
1084 .maxlen = sizeof(int),
1085 .mode = 0644,
1086 .proc_handler = proc_dointvec
1087 },
1088 {
1089 .procname = "tcp_early_retrans",
1090 .data = &init_net.ipv4.sysctl_tcp_early_retrans,
1091 .maxlen = sizeof(int),
1092 .mode = 0644,
1093 .proc_handler = proc_dointvec_minmax,
1094 .extra1 = SYSCTL_ZERO,
1095 .extra2 = &four,
1096 },
1097 {
1098 .procname = "tcp_recovery",
1099 .data = &init_net.ipv4.sysctl_tcp_recovery,
1100 .maxlen = sizeof(int),
1101 .mode = 0644,
1102 .proc_handler = proc_dointvec,
1103 },
1104 {
1105 .procname = "tcp_thin_linear_timeouts",
1106 .data = &init_net.ipv4.sysctl_tcp_thin_linear_timeouts,
1107 .maxlen = sizeof(int),
1108 .mode = 0644,
1109 .proc_handler = proc_dointvec
1110 },
1111 {
1112 .procname = "tcp_slow_start_after_idle",
1113 .data = &init_net.ipv4.sysctl_tcp_slow_start_after_idle,
1114 .maxlen = sizeof(int),
1115 .mode = 0644,
1116 .proc_handler = proc_dointvec
1117 },
1118 {
1119 .procname = "tcp_retrans_collapse",
1120 .data = &init_net.ipv4.sysctl_tcp_retrans_collapse,
1121 .maxlen = sizeof(int),
1122 .mode = 0644,
1123 .proc_handler = proc_dointvec
1124 },
1125 {
1126 .procname = "tcp_stdurg",
1127 .data = &init_net.ipv4.sysctl_tcp_stdurg,
1128 .maxlen = sizeof(int),
1129 .mode = 0644,
1130 .proc_handler = proc_dointvec
1131 },
1132 {
1133 .procname = "tcp_rfc1337",
1134 .data = &init_net.ipv4.sysctl_tcp_rfc1337,
1135 .maxlen = sizeof(int),
1136 .mode = 0644,
1137 .proc_handler = proc_dointvec
1138 },
1139 {
1140 .procname = "tcp_abort_on_overflow",
1141 .data = &init_net.ipv4.sysctl_tcp_abort_on_overflow,
1142 .maxlen = sizeof(int),
1143 .mode = 0644,
1144 .proc_handler = proc_dointvec
1145 },
1146 {
1147 .procname = "tcp_fack",
1148 .data = &init_net.ipv4.sysctl_tcp_fack,
1149 .maxlen = sizeof(int),
1150 .mode = 0644,
1151 .proc_handler = proc_dointvec
1152 },
1153 {
1154 .procname = "tcp_max_reordering",
1155 .data = &init_net.ipv4.sysctl_tcp_max_reordering,
1156 .maxlen = sizeof(int),
1157 .mode = 0644,
1158 .proc_handler = proc_dointvec
1159 },
1160 {
1161 .procname = "tcp_dsack",
1162 .data = &init_net.ipv4.sysctl_tcp_dsack,
1163 .maxlen = sizeof(int),
1164 .mode = 0644,
1165 .proc_handler = proc_dointvec
1166 },
1167 {
1168 .procname = "tcp_app_win",
1169 .data = &init_net.ipv4.sysctl_tcp_app_win,
1170 .maxlen = sizeof(int),
1171 .mode = 0644,
1172 .proc_handler = proc_dointvec
1173 },
1174 {
1175 .procname = "tcp_adv_win_scale",
1176 .data = &init_net.ipv4.sysctl_tcp_adv_win_scale,
1177 .maxlen = sizeof(int),
1178 .mode = 0644,
1179 .proc_handler = proc_dointvec_minmax,
1180 .extra1 = &tcp_adv_win_scale_min,
1181 .extra2 = &tcp_adv_win_scale_max,
1182 },
1183 {
1184 .procname = "tcp_frto",
1185 .data = &init_net.ipv4.sysctl_tcp_frto,
1186 .maxlen = sizeof(int),
1187 .mode = 0644,
1188 .proc_handler = proc_dointvec
1189 },
1190 {
1191 .procname = "tcp_no_metrics_save",
1192 .data = &init_net.ipv4.sysctl_tcp_nometrics_save,
1193 .maxlen = sizeof(int),
1194 .mode = 0644,
1195 .proc_handler = proc_dointvec,
1196 },
1197 {
1198 .procname = "tcp_no_ssthresh_metrics_save",
1199 .data = &init_net.ipv4.sysctl_tcp_no_ssthresh_metrics_save,
1200 .maxlen = sizeof(int),
1201 .mode = 0644,
1202 .proc_handler = proc_dointvec_minmax,
1203 .extra1 = SYSCTL_ZERO,
1204 .extra2 = SYSCTL_ONE,
1205 },
1206 {
1207 .procname = "tcp_moderate_rcvbuf",
1208 .data = &init_net.ipv4.sysctl_tcp_moderate_rcvbuf,
1209 .maxlen = sizeof(int),
1210 .mode = 0644,
1211 .proc_handler = proc_dointvec,
1212 },
1213 {
1214 .procname = "tcp_tso_win_divisor",
1215 .data = &init_net.ipv4.sysctl_tcp_tso_win_divisor,
1216 .maxlen = sizeof(int),
1217 .mode = 0644,
1218 .proc_handler = proc_dointvec,
1219 },
1220 {
1221 .procname = "tcp_workaround_signed_windows",
1222 .data = &init_net.ipv4.sysctl_tcp_workaround_signed_windows,
1223 .maxlen = sizeof(int),
1224 .mode = 0644,
1225 .proc_handler = proc_dointvec
1226 },
1227 {
1228 .procname = "tcp_limit_output_bytes",
1229 .data = &init_net.ipv4.sysctl_tcp_limit_output_bytes,
1230 .maxlen = sizeof(int),
1231 .mode = 0644,
1232 .proc_handler = proc_dointvec
1233 },
1234 {
1235 .procname = "tcp_challenge_ack_limit",
1236 .data = &init_net.ipv4.sysctl_tcp_challenge_ack_limit,
1237 .maxlen = sizeof(int),
1238 .mode = 0644,
1239 .proc_handler = proc_dointvec
1240 },
1241 {
1242 .procname = "tcp_min_tso_segs",
1243 .data = &init_net.ipv4.sysctl_tcp_min_tso_segs,
1244 .maxlen = sizeof(int),
1245 .mode = 0644,
1246 .proc_handler = proc_dointvec_minmax,
1247 .extra1 = SYSCTL_ONE,
1248 .extra2 = &gso_max_segs,
1249 },
1250 {
1251 .procname = "tcp_min_rtt_wlen",
1252 .data = &init_net.ipv4.sysctl_tcp_min_rtt_wlen,
1253 .maxlen = sizeof(int),
1254 .mode = 0644,
1255 .proc_handler = proc_dointvec_minmax,
1256 .extra1 = SYSCTL_ZERO,
1257 .extra2 = &one_day_secs
1258 },
1259 {
1260 .procname = "tcp_autocorking",
1261 .data = &init_net.ipv4.sysctl_tcp_autocorking,
1262 .maxlen = sizeof(int),
1263 .mode = 0644,
1264 .proc_handler = proc_dointvec_minmax,
1265 .extra1 = SYSCTL_ZERO,
1266 .extra2 = SYSCTL_ONE,
1267 },
1268 {
1269 .procname = "tcp_invalid_ratelimit",
1270 .data = &init_net.ipv4.sysctl_tcp_invalid_ratelimit,
1271 .maxlen = sizeof(int),
1272 .mode = 0644,
1273 .proc_handler = proc_dointvec_ms_jiffies,
1274 },
1275 {
1276 .procname = "tcp_pacing_ss_ratio",
1277 .data = &init_net.ipv4.sysctl_tcp_pacing_ss_ratio,
1278 .maxlen = sizeof(int),
1279 .mode = 0644,
1280 .proc_handler = proc_dointvec_minmax,
1281 .extra1 = SYSCTL_ZERO,
1282 .extra2 = &thousand,
1283 },
1284 {
1285 .procname = "tcp_pacing_ca_ratio",
1286 .data = &init_net.ipv4.sysctl_tcp_pacing_ca_ratio,
1287 .maxlen = sizeof(int),
1288 .mode = 0644,
1289 .proc_handler = proc_dointvec_minmax,
1290 .extra1 = SYSCTL_ZERO,
1291 .extra2 = &thousand,
1292 },
1293 {
1294 .procname = "tcp_wmem",
1295 .data = &init_net.ipv4.sysctl_tcp_wmem,
1296 .maxlen = sizeof(init_net.ipv4.sysctl_tcp_wmem),
1297 .mode = 0644,
1298 .proc_handler = proc_dointvec_minmax,
1299 .extra1 = SYSCTL_ONE,
1300 },
1301 {
1302 .procname = "tcp_rmem",
1303 .data = &init_net.ipv4.sysctl_tcp_rmem,
1304 .maxlen = sizeof(init_net.ipv4.sysctl_tcp_rmem),
1305 .mode = 0644,
1306 .proc_handler = proc_dointvec_minmax,
1307 .extra1 = SYSCTL_ONE,
1308 },
1309 {
1310 .procname = "tcp_comp_sack_delay_ns",
1311 .data = &init_net.ipv4.sysctl_tcp_comp_sack_delay_ns,
1312 .maxlen = sizeof(unsigned long),
1313 .mode = 0644,
1314 .proc_handler = proc_doulongvec_minmax,
1315 },
1316 {
1317 .procname = "tcp_comp_sack_slack_ns",
1318 .data = &init_net.ipv4.sysctl_tcp_comp_sack_slack_ns,
1319 .maxlen = sizeof(unsigned long),
1320 .mode = 0644,
1321 .proc_handler = proc_doulongvec_minmax,
1322 },
1323 {
1324 .procname = "tcp_comp_sack_nr",
1325 .data = &init_net.ipv4.sysctl_tcp_comp_sack_nr,
1326 .maxlen = sizeof(int),
1327 .mode = 0644,
1328 .proc_handler = proc_dointvec_minmax,
1329 .extra1 = SYSCTL_ZERO,
1330 .extra2 = &comp_sack_nr_max,
1331 },
1332 {
1333 .procname = "udp_rmem_min",
1334 .data = &init_net.ipv4.sysctl_udp_rmem_min,
1335 .maxlen = sizeof(init_net.ipv4.sysctl_udp_rmem_min),
1336 .mode = 0644,
1337 .proc_handler = proc_dointvec_minmax,
1338 .extra1 = SYSCTL_ONE
1339 },
1340 {
1341 .procname = "udp_wmem_min",
1342 .data = &init_net.ipv4.sysctl_udp_wmem_min,
1343 .maxlen = sizeof(init_net.ipv4.sysctl_udp_wmem_min),
1344 .mode = 0644,
1345 .proc_handler = proc_dointvec_minmax,
1346 .extra1 = SYSCTL_ONE
1347 },
1348 { }
1349};
1350
1351static __net_init int ipv4_sysctl_init_net(struct net *net)
1352{
1353 struct ctl_table *table;
1354
1355 table = ipv4_net_table;
1356 if (!net_eq(net, &init_net)) {
1357 int i;
1358
1359 table = kmemdup(table, sizeof(ipv4_net_table), GFP_KERNEL);
1360 if (!table)
1361 goto err_alloc;
1362
1363 /* Update the variables to point into the current struct net */
1364 for (i = 0; i < ARRAY_SIZE(ipv4_net_table) - 1; i++)
1365 table[i].data += (void *)net - (void *)&init_net;
1366 }
1367
1368 net->ipv4.ipv4_hdr = register_net_sysctl(net, "net/ipv4", table);
1369 if (!net->ipv4.ipv4_hdr)
1370 goto err_reg;
1371
1372 net->ipv4.sysctl_local_reserved_ports = kzalloc(65536 / 8, GFP_KERNEL);
1373 if (!net->ipv4.sysctl_local_reserved_ports)
1374 goto err_ports;
1375
1376 return 0;
1377
1378err_ports:
1379 unregister_net_sysctl_table(net->ipv4.ipv4_hdr);
1380err_reg:
1381 if (!net_eq(net, &init_net))
1382 kfree(table);
1383err_alloc:
1384 return -ENOMEM;
1385}
1386
1387static __net_exit void ipv4_sysctl_exit_net(struct net *net)
1388{
1389 struct ctl_table *table;
1390
1391 kfree(net->ipv4.sysctl_local_reserved_ports);
1392 table = net->ipv4.ipv4_hdr->ctl_table_arg;
1393 unregister_net_sysctl_table(net->ipv4.ipv4_hdr);
1394 kfree(table);
1395}
1396
1397static __net_initdata struct pernet_operations ipv4_sysctl_ops = {
1398 .init = ipv4_sysctl_init_net,
1399 .exit = ipv4_sysctl_exit_net,
1400};
1401
1402static __init int sysctl_ipv4_init(void)
1403{
1404 struct ctl_table_header *hdr;
1405
1406 hdr = register_net_sysctl(&init_net, "net/ipv4", ipv4_table);
1407 if (!hdr)
1408 return -ENOMEM;
1409
1410 if (register_pernet_subsys(&ipv4_sysctl_ops)) {
1411 unregister_net_sysctl_table(hdr);
1412 return -ENOMEM;
1413 }
1414
1415 return 0;
1416}
1417
1418__initcall(sysctl_ipv4_init);