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tcp_memcontrol: Remove setting cgroup settings via sysctl
[mirror_ubuntu-zesty-kernel.git] / net / ipv4 / sysctl_net_ipv4.c
1 /*
2 * sysctl_net_ipv4.c: sysctl interface to net IPV4 subsystem.
3 *
4 * Begun April 1, 1996, Mike Shaver.
5 * Added /proc/sys/net/ipv4 directory entry (empty =) ). [MS]
6 */
7
8 #include <linux/mm.h>
9 #include <linux/module.h>
10 #include <linux/sysctl.h>
11 #include <linux/igmp.h>
12 #include <linux/inetdevice.h>
13 #include <linux/seqlock.h>
14 #include <linux/init.h>
15 #include <linux/slab.h>
16 #include <linux/nsproxy.h>
17 #include <linux/swap.h>
18 #include <net/snmp.h>
19 #include <net/icmp.h>
20 #include <net/ip.h>
21 #include <net/route.h>
22 #include <net/tcp.h>
23 #include <net/udp.h>
24 #include <net/cipso_ipv4.h>
25 #include <net/inet_frag.h>
26 #include <net/ping.h>
27 #include <net/tcp_memcontrol.h>
28
29 static int zero;
30 static int one = 1;
31 static int four = 4;
32 static int gso_max_segs = GSO_MAX_SEGS;
33 static int tcp_retr1_max = 255;
34 static int ip_local_port_range_min[] = { 1, 1 };
35 static int ip_local_port_range_max[] = { 65535, 65535 };
36 static int tcp_adv_win_scale_min = -31;
37 static int tcp_adv_win_scale_max = 31;
38 static int ip_ttl_min = 1;
39 static int ip_ttl_max = 255;
40 static int tcp_syn_retries_min = 1;
41 static int tcp_syn_retries_max = MAX_TCP_SYNCNT;
42 static int ip_ping_group_range_min[] = { 0, 0 };
43 static int ip_ping_group_range_max[] = { GID_T_MAX, GID_T_MAX };
44
45 /* Update system visible IP port range */
46 static void set_local_port_range(struct net *net, int range[2])
47 {
48 write_seqlock(&net->ipv4.sysctl_local_ports.lock);
49 net->ipv4.sysctl_local_ports.range[0] = range[0];
50 net->ipv4.sysctl_local_ports.range[1] = range[1];
51 write_sequnlock(&net->ipv4.sysctl_local_ports.lock);
52 }
53
54 /* Validate changes from /proc interface. */
55 static int ipv4_local_port_range(struct ctl_table *table, int write,
56 void __user *buffer,
57 size_t *lenp, loff_t *ppos)
58 {
59 struct net *net =
60 container_of(table->data, struct net, ipv4.sysctl_local_ports.range);
61 int ret;
62 int range[2];
63 struct ctl_table tmp = {
64 .data = &range,
65 .maxlen = sizeof(range),
66 .mode = table->mode,
67 .extra1 = &ip_local_port_range_min,
68 .extra2 = &ip_local_port_range_max,
69 };
70
71 inet_get_local_port_range(net, &range[0], &range[1]);
72
73 ret = proc_dointvec_minmax(&tmp, write, buffer, lenp, ppos);
74
75 if (write && ret == 0) {
76 if (range[1] < range[0])
77 ret = -EINVAL;
78 else
79 set_local_port_range(net, range);
80 }
81
82 return ret;
83 }
84
85
86 static void inet_get_ping_group_range_table(struct ctl_table *table, kgid_t *low, kgid_t *high)
87 {
88 kgid_t *data = table->data;
89 struct net *net =
90 container_of(table->data, struct net, ipv4.sysctl_ping_group_range);
91 unsigned int seq;
92 do {
93 seq = read_seqbegin(&net->ipv4.sysctl_local_ports.lock);
94
95 *low = data[0];
96 *high = data[1];
97 } while (read_seqretry(&net->ipv4.sysctl_local_ports.lock, seq));
98 }
99
100 /* Update system visible IP port range */
101 static void set_ping_group_range(struct ctl_table *table, kgid_t low, kgid_t high)
102 {
103 kgid_t *data = table->data;
104 struct net *net =
105 container_of(table->data, struct net, ipv4.sysctl_ping_group_range);
106 write_seqlock(&net->ipv4.sysctl_local_ports.lock);
107 data[0] = low;
108 data[1] = high;
109 write_sequnlock(&net->ipv4.sysctl_local_ports.lock);
110 }
111
112 /* Validate changes from /proc interface. */
113 static int ipv4_ping_group_range(struct ctl_table *table, int write,
114 void __user *buffer,
115 size_t *lenp, loff_t *ppos)
116 {
117 struct user_namespace *user_ns = current_user_ns();
118 int ret;
119 gid_t urange[2];
120 kgid_t low, high;
121 struct ctl_table tmp = {
122 .data = &urange,
123 .maxlen = sizeof(urange),
124 .mode = table->mode,
125 .extra1 = &ip_ping_group_range_min,
126 .extra2 = &ip_ping_group_range_max,
127 };
128
129 inet_get_ping_group_range_table(table, &low, &high);
130 urange[0] = from_kgid_munged(user_ns, low);
131 urange[1] = from_kgid_munged(user_ns, high);
132 ret = proc_dointvec_minmax(&tmp, write, buffer, lenp, ppos);
133
134 if (write && ret == 0) {
135 low = make_kgid(user_ns, urange[0]);
136 high = make_kgid(user_ns, urange[1]);
137 if (!gid_valid(low) || !gid_valid(high) ||
138 (urange[1] < urange[0]) || gid_lt(high, low)) {
139 low = make_kgid(&init_user_ns, 1);
140 high = make_kgid(&init_user_ns, 0);
141 }
142 set_ping_group_range(table, low, high);
143 }
144
145 return ret;
146 }
147
148 static int proc_tcp_congestion_control(struct ctl_table *ctl, int write,
149 void __user *buffer, size_t *lenp, loff_t *ppos)
150 {
151 char val[TCP_CA_NAME_MAX];
152 struct ctl_table tbl = {
153 .data = val,
154 .maxlen = TCP_CA_NAME_MAX,
155 };
156 int ret;
157
158 tcp_get_default_congestion_control(val);
159
160 ret = proc_dostring(&tbl, write, buffer, lenp, ppos);
161 if (write && ret == 0)
162 ret = tcp_set_default_congestion_control(val);
163 return ret;
164 }
165
166 static int proc_tcp_available_congestion_control(struct ctl_table *ctl,
167 int write,
168 void __user *buffer, size_t *lenp,
169 loff_t *ppos)
170 {
171 struct ctl_table tbl = { .maxlen = TCP_CA_BUF_MAX, };
172 int ret;
173
174 tbl.data = kmalloc(tbl.maxlen, GFP_USER);
175 if (!tbl.data)
176 return -ENOMEM;
177 tcp_get_available_congestion_control(tbl.data, TCP_CA_BUF_MAX);
178 ret = proc_dostring(&tbl, write, buffer, lenp, ppos);
179 kfree(tbl.data);
180 return ret;
181 }
182
183 static int proc_allowed_congestion_control(struct ctl_table *ctl,
184 int write,
185 void __user *buffer, size_t *lenp,
186 loff_t *ppos)
187 {
188 struct ctl_table tbl = { .maxlen = TCP_CA_BUF_MAX };
189 int ret;
190
191 tbl.data = kmalloc(tbl.maxlen, GFP_USER);
192 if (!tbl.data)
193 return -ENOMEM;
194
195 tcp_get_allowed_congestion_control(tbl.data, tbl.maxlen);
196 ret = proc_dostring(&tbl, write, buffer, lenp, ppos);
197 if (write && ret == 0)
198 ret = tcp_set_allowed_congestion_control(tbl.data);
199 kfree(tbl.data);
200 return ret;
201 }
202
203 static int ipv4_tcp_mem(struct ctl_table *ctl, int write,
204 void __user *buffer, size_t *lenp,
205 loff_t *ppos)
206 {
207 ctl->data = &current->nsproxy->net_ns->ipv4.sysctl_tcp_mem;
208 return proc_doulongvec_minmax(ctl, write, buffer, lenp, ppos);
209 }
210
211 static int proc_tcp_fastopen_key(struct ctl_table *ctl, int write,
212 void __user *buffer, size_t *lenp,
213 loff_t *ppos)
214 {
215 struct ctl_table tbl = { .maxlen = (TCP_FASTOPEN_KEY_LENGTH * 2 + 10) };
216 struct tcp_fastopen_context *ctxt;
217 int ret;
218 u32 user_key[4]; /* 16 bytes, matching TCP_FASTOPEN_KEY_LENGTH */
219
220 tbl.data = kmalloc(tbl.maxlen, GFP_KERNEL);
221 if (!tbl.data)
222 return -ENOMEM;
223
224 rcu_read_lock();
225 ctxt = rcu_dereference(tcp_fastopen_ctx);
226 if (ctxt)
227 memcpy(user_key, ctxt->key, TCP_FASTOPEN_KEY_LENGTH);
228 else
229 memset(user_key, 0, sizeof(user_key));
230 rcu_read_unlock();
231
232 snprintf(tbl.data, tbl.maxlen, "%08x-%08x-%08x-%08x",
233 user_key[0], user_key[1], user_key[2], user_key[3]);
234 ret = proc_dostring(&tbl, write, buffer, lenp, ppos);
235
236 if (write && ret == 0) {
237 if (sscanf(tbl.data, "%x-%x-%x-%x", user_key, user_key + 1,
238 user_key + 2, user_key + 3) != 4) {
239 ret = -EINVAL;
240 goto bad_key;
241 }
242 /* Generate a dummy secret but don't publish it. This
243 * is needed so we don't regenerate a new key on the
244 * first invocation of tcp_fastopen_cookie_gen
245 */
246 tcp_fastopen_init_key_once(false);
247 tcp_fastopen_reset_cipher(user_key, TCP_FASTOPEN_KEY_LENGTH);
248 }
249
250 bad_key:
251 pr_debug("proc FO key set 0x%x-%x-%x-%x <- 0x%s: %u\n",
252 user_key[0], user_key[1], user_key[2], user_key[3],
253 (char *)tbl.data, ret);
254 kfree(tbl.data);
255 return ret;
256 }
257
258 static struct ctl_table ipv4_table[] = {
259 {
260 .procname = "tcp_timestamps",
261 .data = &sysctl_tcp_timestamps,
262 .maxlen = sizeof(int),
263 .mode = 0644,
264 .proc_handler = proc_dointvec
265 },
266 {
267 .procname = "tcp_window_scaling",
268 .data = &sysctl_tcp_window_scaling,
269 .maxlen = sizeof(int),
270 .mode = 0644,
271 .proc_handler = proc_dointvec
272 },
273 {
274 .procname = "tcp_sack",
275 .data = &sysctl_tcp_sack,
276 .maxlen = sizeof(int),
277 .mode = 0644,
278 .proc_handler = proc_dointvec
279 },
280 {
281 .procname = "tcp_retrans_collapse",
282 .data = &sysctl_tcp_retrans_collapse,
283 .maxlen = sizeof(int),
284 .mode = 0644,
285 .proc_handler = proc_dointvec
286 },
287 {
288 .procname = "ip_default_ttl",
289 .data = &sysctl_ip_default_ttl,
290 .maxlen = sizeof(int),
291 .mode = 0644,
292 .proc_handler = proc_dointvec_minmax,
293 .extra1 = &ip_ttl_min,
294 .extra2 = &ip_ttl_max,
295 },
296 {
297 .procname = "ip_no_pmtu_disc",
298 .data = &ipv4_config.no_pmtu_disc,
299 .maxlen = sizeof(int),
300 .mode = 0644,
301 .proc_handler = proc_dointvec
302 },
303 {
304 .procname = "ip_nonlocal_bind",
305 .data = &sysctl_ip_nonlocal_bind,
306 .maxlen = sizeof(int),
307 .mode = 0644,
308 .proc_handler = proc_dointvec
309 },
310 {
311 .procname = "tcp_syn_retries",
312 .data = &sysctl_tcp_syn_retries,
313 .maxlen = sizeof(int),
314 .mode = 0644,
315 .proc_handler = proc_dointvec_minmax,
316 .extra1 = &tcp_syn_retries_min,
317 .extra2 = &tcp_syn_retries_max
318 },
319 {
320 .procname = "tcp_synack_retries",
321 .data = &sysctl_tcp_synack_retries,
322 .maxlen = sizeof(int),
323 .mode = 0644,
324 .proc_handler = proc_dointvec
325 },
326 {
327 .procname = "tcp_max_orphans",
328 .data = &sysctl_tcp_max_orphans,
329 .maxlen = sizeof(int),
330 .mode = 0644,
331 .proc_handler = proc_dointvec
332 },
333 {
334 .procname = "tcp_max_tw_buckets",
335 .data = &tcp_death_row.sysctl_max_tw_buckets,
336 .maxlen = sizeof(int),
337 .mode = 0644,
338 .proc_handler = proc_dointvec
339 },
340 {
341 .procname = "ip_early_demux",
342 .data = &sysctl_ip_early_demux,
343 .maxlen = sizeof(int),
344 .mode = 0644,
345 .proc_handler = proc_dointvec
346 },
347 {
348 .procname = "ip_dynaddr",
349 .data = &sysctl_ip_dynaddr,
350 .maxlen = sizeof(int),
351 .mode = 0644,
352 .proc_handler = proc_dointvec
353 },
354 {
355 .procname = "tcp_keepalive_time",
356 .data = &sysctl_tcp_keepalive_time,
357 .maxlen = sizeof(int),
358 .mode = 0644,
359 .proc_handler = proc_dointvec_jiffies,
360 },
361 {
362 .procname = "tcp_keepalive_probes",
363 .data = &sysctl_tcp_keepalive_probes,
364 .maxlen = sizeof(int),
365 .mode = 0644,
366 .proc_handler = proc_dointvec
367 },
368 {
369 .procname = "tcp_keepalive_intvl",
370 .data = &sysctl_tcp_keepalive_intvl,
371 .maxlen = sizeof(int),
372 .mode = 0644,
373 .proc_handler = proc_dointvec_jiffies,
374 },
375 {
376 .procname = "tcp_retries1",
377 .data = &sysctl_tcp_retries1,
378 .maxlen = sizeof(int),
379 .mode = 0644,
380 .proc_handler = proc_dointvec_minmax,
381 .extra2 = &tcp_retr1_max
382 },
383 {
384 .procname = "tcp_retries2",
385 .data = &sysctl_tcp_retries2,
386 .maxlen = sizeof(int),
387 .mode = 0644,
388 .proc_handler = proc_dointvec
389 },
390 {
391 .procname = "tcp_fin_timeout",
392 .data = &sysctl_tcp_fin_timeout,
393 .maxlen = sizeof(int),
394 .mode = 0644,
395 .proc_handler = proc_dointvec_jiffies,
396 },
397 #ifdef CONFIG_SYN_COOKIES
398 {
399 .procname = "tcp_syncookies",
400 .data = &sysctl_tcp_syncookies,
401 .maxlen = sizeof(int),
402 .mode = 0644,
403 .proc_handler = proc_dointvec
404 },
405 #endif
406 {
407 .procname = "tcp_fastopen",
408 .data = &sysctl_tcp_fastopen,
409 .maxlen = sizeof(int),
410 .mode = 0644,
411 .proc_handler = proc_dointvec,
412 },
413 {
414 .procname = "tcp_fastopen_key",
415 .mode = 0600,
416 .maxlen = ((TCP_FASTOPEN_KEY_LENGTH * 2) + 10),
417 .proc_handler = proc_tcp_fastopen_key,
418 },
419 {
420 .procname = "tcp_tw_recycle",
421 .data = &tcp_death_row.sysctl_tw_recycle,
422 .maxlen = sizeof(int),
423 .mode = 0644,
424 .proc_handler = proc_dointvec
425 },
426 {
427 .procname = "tcp_abort_on_overflow",
428 .data = &sysctl_tcp_abort_on_overflow,
429 .maxlen = sizeof(int),
430 .mode = 0644,
431 .proc_handler = proc_dointvec
432 },
433 {
434 .procname = "tcp_stdurg",
435 .data = &sysctl_tcp_stdurg,
436 .maxlen = sizeof(int),
437 .mode = 0644,
438 .proc_handler = proc_dointvec
439 },
440 {
441 .procname = "tcp_rfc1337",
442 .data = &sysctl_tcp_rfc1337,
443 .maxlen = sizeof(int),
444 .mode = 0644,
445 .proc_handler = proc_dointvec
446 },
447 {
448 .procname = "tcp_max_syn_backlog",
449 .data = &sysctl_max_syn_backlog,
450 .maxlen = sizeof(int),
451 .mode = 0644,
452 .proc_handler = proc_dointvec
453 },
454 {
455 .procname = "ip_local_reserved_ports",
456 .data = NULL, /* initialized in sysctl_ipv4_init */
457 .maxlen = 65536,
458 .mode = 0644,
459 .proc_handler = proc_do_large_bitmap,
460 },
461 {
462 .procname = "igmp_max_memberships",
463 .data = &sysctl_igmp_max_memberships,
464 .maxlen = sizeof(int),
465 .mode = 0644,
466 .proc_handler = proc_dointvec
467 },
468 {
469 .procname = "igmp_max_msf",
470 .data = &sysctl_igmp_max_msf,
471 .maxlen = sizeof(int),
472 .mode = 0644,
473 .proc_handler = proc_dointvec
474 },
475 {
476 .procname = "inet_peer_threshold",
477 .data = &inet_peer_threshold,
478 .maxlen = sizeof(int),
479 .mode = 0644,
480 .proc_handler = proc_dointvec
481 },
482 {
483 .procname = "inet_peer_minttl",
484 .data = &inet_peer_minttl,
485 .maxlen = sizeof(int),
486 .mode = 0644,
487 .proc_handler = proc_dointvec_jiffies,
488 },
489 {
490 .procname = "inet_peer_maxttl",
491 .data = &inet_peer_maxttl,
492 .maxlen = sizeof(int),
493 .mode = 0644,
494 .proc_handler = proc_dointvec_jiffies,
495 },
496 {
497 .procname = "tcp_orphan_retries",
498 .data = &sysctl_tcp_orphan_retries,
499 .maxlen = sizeof(int),
500 .mode = 0644,
501 .proc_handler = proc_dointvec
502 },
503 {
504 .procname = "tcp_fack",
505 .data = &sysctl_tcp_fack,
506 .maxlen = sizeof(int),
507 .mode = 0644,
508 .proc_handler = proc_dointvec
509 },
510 {
511 .procname = "tcp_reordering",
512 .data = &sysctl_tcp_reordering,
513 .maxlen = sizeof(int),
514 .mode = 0644,
515 .proc_handler = proc_dointvec
516 },
517 {
518 .procname = "tcp_dsack",
519 .data = &sysctl_tcp_dsack,
520 .maxlen = sizeof(int),
521 .mode = 0644,
522 .proc_handler = proc_dointvec
523 },
524 {
525 .procname = "tcp_wmem",
526 .data = &sysctl_tcp_wmem,
527 .maxlen = sizeof(sysctl_tcp_wmem),
528 .mode = 0644,
529 .proc_handler = proc_dointvec_minmax,
530 .extra1 = &one,
531 },
532 {
533 .procname = "tcp_notsent_lowat",
534 .data = &sysctl_tcp_notsent_lowat,
535 .maxlen = sizeof(sysctl_tcp_notsent_lowat),
536 .mode = 0644,
537 .proc_handler = proc_dointvec,
538 },
539 {
540 .procname = "tcp_rmem",
541 .data = &sysctl_tcp_rmem,
542 .maxlen = sizeof(sysctl_tcp_rmem),
543 .mode = 0644,
544 .proc_handler = proc_dointvec_minmax,
545 .extra1 = &one,
546 },
547 {
548 .procname = "tcp_app_win",
549 .data = &sysctl_tcp_app_win,
550 .maxlen = sizeof(int),
551 .mode = 0644,
552 .proc_handler = proc_dointvec
553 },
554 {
555 .procname = "tcp_adv_win_scale",
556 .data = &sysctl_tcp_adv_win_scale,
557 .maxlen = sizeof(int),
558 .mode = 0644,
559 .proc_handler = proc_dointvec_minmax,
560 .extra1 = &tcp_adv_win_scale_min,
561 .extra2 = &tcp_adv_win_scale_max,
562 },
563 {
564 .procname = "tcp_tw_reuse",
565 .data = &sysctl_tcp_tw_reuse,
566 .maxlen = sizeof(int),
567 .mode = 0644,
568 .proc_handler = proc_dointvec
569 },
570 {
571 .procname = "tcp_frto",
572 .data = &sysctl_tcp_frto,
573 .maxlen = sizeof(int),
574 .mode = 0644,
575 .proc_handler = proc_dointvec
576 },
577 {
578 .procname = "tcp_low_latency",
579 .data = &sysctl_tcp_low_latency,
580 .maxlen = sizeof(int),
581 .mode = 0644,
582 .proc_handler = proc_dointvec
583 },
584 {
585 .procname = "tcp_no_metrics_save",
586 .data = &sysctl_tcp_nometrics_save,
587 .maxlen = sizeof(int),
588 .mode = 0644,
589 .proc_handler = proc_dointvec,
590 },
591 {
592 .procname = "tcp_moderate_rcvbuf",
593 .data = &sysctl_tcp_moderate_rcvbuf,
594 .maxlen = sizeof(int),
595 .mode = 0644,
596 .proc_handler = proc_dointvec,
597 },
598 {
599 .procname = "tcp_tso_win_divisor",
600 .data = &sysctl_tcp_tso_win_divisor,
601 .maxlen = sizeof(int),
602 .mode = 0644,
603 .proc_handler = proc_dointvec,
604 },
605 {
606 .procname = "tcp_congestion_control",
607 .mode = 0644,
608 .maxlen = TCP_CA_NAME_MAX,
609 .proc_handler = proc_tcp_congestion_control,
610 },
611 {
612 .procname = "tcp_mtu_probing",
613 .data = &sysctl_tcp_mtu_probing,
614 .maxlen = sizeof(int),
615 .mode = 0644,
616 .proc_handler = proc_dointvec,
617 },
618 {
619 .procname = "tcp_base_mss",
620 .data = &sysctl_tcp_base_mss,
621 .maxlen = sizeof(int),
622 .mode = 0644,
623 .proc_handler = proc_dointvec,
624 },
625 {
626 .procname = "tcp_workaround_signed_windows",
627 .data = &sysctl_tcp_workaround_signed_windows,
628 .maxlen = sizeof(int),
629 .mode = 0644,
630 .proc_handler = proc_dointvec
631 },
632 {
633 .procname = "tcp_limit_output_bytes",
634 .data = &sysctl_tcp_limit_output_bytes,
635 .maxlen = sizeof(int),
636 .mode = 0644,
637 .proc_handler = proc_dointvec
638 },
639 {
640 .procname = "tcp_challenge_ack_limit",
641 .data = &sysctl_tcp_challenge_ack_limit,
642 .maxlen = sizeof(int),
643 .mode = 0644,
644 .proc_handler = proc_dointvec
645 },
646 #ifdef CONFIG_NET_DMA
647 {
648 .procname = "tcp_dma_copybreak",
649 .data = &sysctl_tcp_dma_copybreak,
650 .maxlen = sizeof(int),
651 .mode = 0644,
652 .proc_handler = proc_dointvec
653 },
654 #endif
655 {
656 .procname = "tcp_slow_start_after_idle",
657 .data = &sysctl_tcp_slow_start_after_idle,
658 .maxlen = sizeof(int),
659 .mode = 0644,
660 .proc_handler = proc_dointvec
661 },
662 #ifdef CONFIG_NETLABEL
663 {
664 .procname = "cipso_cache_enable",
665 .data = &cipso_v4_cache_enabled,
666 .maxlen = sizeof(int),
667 .mode = 0644,
668 .proc_handler = proc_dointvec,
669 },
670 {
671 .procname = "cipso_cache_bucket_size",
672 .data = &cipso_v4_cache_bucketsize,
673 .maxlen = sizeof(int),
674 .mode = 0644,
675 .proc_handler = proc_dointvec,
676 },
677 {
678 .procname = "cipso_rbm_optfmt",
679 .data = &cipso_v4_rbm_optfmt,
680 .maxlen = sizeof(int),
681 .mode = 0644,
682 .proc_handler = proc_dointvec,
683 },
684 {
685 .procname = "cipso_rbm_strictvalid",
686 .data = &cipso_v4_rbm_strictvalid,
687 .maxlen = sizeof(int),
688 .mode = 0644,
689 .proc_handler = proc_dointvec,
690 },
691 #endif /* CONFIG_NETLABEL */
692 {
693 .procname = "tcp_available_congestion_control",
694 .maxlen = TCP_CA_BUF_MAX,
695 .mode = 0444,
696 .proc_handler = proc_tcp_available_congestion_control,
697 },
698 {
699 .procname = "tcp_allowed_congestion_control",
700 .maxlen = TCP_CA_BUF_MAX,
701 .mode = 0644,
702 .proc_handler = proc_allowed_congestion_control,
703 },
704 {
705 .procname = "tcp_max_ssthresh",
706 .data = &sysctl_tcp_max_ssthresh,
707 .maxlen = sizeof(int),
708 .mode = 0644,
709 .proc_handler = proc_dointvec,
710 },
711 {
712 .procname = "tcp_thin_linear_timeouts",
713 .data = &sysctl_tcp_thin_linear_timeouts,
714 .maxlen = sizeof(int),
715 .mode = 0644,
716 .proc_handler = proc_dointvec
717 },
718 {
719 .procname = "tcp_thin_dupack",
720 .data = &sysctl_tcp_thin_dupack,
721 .maxlen = sizeof(int),
722 .mode = 0644,
723 .proc_handler = proc_dointvec
724 },
725 {
726 .procname = "tcp_early_retrans",
727 .data = &sysctl_tcp_early_retrans,
728 .maxlen = sizeof(int),
729 .mode = 0644,
730 .proc_handler = proc_dointvec_minmax,
731 .extra1 = &zero,
732 .extra2 = &four,
733 },
734 {
735 .procname = "tcp_min_tso_segs",
736 .data = &sysctl_tcp_min_tso_segs,
737 .maxlen = sizeof(int),
738 .mode = 0644,
739 .proc_handler = proc_dointvec_minmax,
740 .extra1 = &zero,
741 .extra2 = &gso_max_segs,
742 },
743 {
744 .procname = "udp_mem",
745 .data = &sysctl_udp_mem,
746 .maxlen = sizeof(sysctl_udp_mem),
747 .mode = 0644,
748 .proc_handler = proc_doulongvec_minmax,
749 },
750 {
751 .procname = "udp_rmem_min",
752 .data = &sysctl_udp_rmem_min,
753 .maxlen = sizeof(sysctl_udp_rmem_min),
754 .mode = 0644,
755 .proc_handler = proc_dointvec_minmax,
756 .extra1 = &one
757 },
758 {
759 .procname = "udp_wmem_min",
760 .data = &sysctl_udp_wmem_min,
761 .maxlen = sizeof(sysctl_udp_wmem_min),
762 .mode = 0644,
763 .proc_handler = proc_dointvec_minmax,
764 .extra1 = &one
765 },
766 { }
767 };
768
769 static struct ctl_table ipv4_net_table[] = {
770 {
771 .procname = "icmp_echo_ignore_all",
772 .data = &init_net.ipv4.sysctl_icmp_echo_ignore_all,
773 .maxlen = sizeof(int),
774 .mode = 0644,
775 .proc_handler = proc_dointvec
776 },
777 {
778 .procname = "icmp_echo_ignore_broadcasts",
779 .data = &init_net.ipv4.sysctl_icmp_echo_ignore_broadcasts,
780 .maxlen = sizeof(int),
781 .mode = 0644,
782 .proc_handler = proc_dointvec
783 },
784 {
785 .procname = "icmp_ignore_bogus_error_responses",
786 .data = &init_net.ipv4.sysctl_icmp_ignore_bogus_error_responses,
787 .maxlen = sizeof(int),
788 .mode = 0644,
789 .proc_handler = proc_dointvec
790 },
791 {
792 .procname = "icmp_errors_use_inbound_ifaddr",
793 .data = &init_net.ipv4.sysctl_icmp_errors_use_inbound_ifaddr,
794 .maxlen = sizeof(int),
795 .mode = 0644,
796 .proc_handler = proc_dointvec
797 },
798 {
799 .procname = "icmp_ratelimit",
800 .data = &init_net.ipv4.sysctl_icmp_ratelimit,
801 .maxlen = sizeof(int),
802 .mode = 0644,
803 .proc_handler = proc_dointvec_ms_jiffies,
804 },
805 {
806 .procname = "icmp_ratemask",
807 .data = &init_net.ipv4.sysctl_icmp_ratemask,
808 .maxlen = sizeof(int),
809 .mode = 0644,
810 .proc_handler = proc_dointvec
811 },
812 {
813 .procname = "ping_group_range",
814 .data = &init_net.ipv4.sysctl_ping_group_range,
815 .maxlen = sizeof(gid_t)*2,
816 .mode = 0644,
817 .proc_handler = ipv4_ping_group_range,
818 },
819 {
820 .procname = "tcp_ecn",
821 .data = &init_net.ipv4.sysctl_tcp_ecn,
822 .maxlen = sizeof(int),
823 .mode = 0644,
824 .proc_handler = proc_dointvec
825 },
826 {
827 .procname = "ip_local_port_range",
828 .maxlen = sizeof(init_net.ipv4.sysctl_local_ports.range),
829 .data = &init_net.ipv4.sysctl_local_ports.range,
830 .mode = 0644,
831 .proc_handler = ipv4_local_port_range,
832 },
833 {
834 .procname = "tcp_mem",
835 .maxlen = sizeof(init_net.ipv4.sysctl_tcp_mem),
836 .mode = 0644,
837 .proc_handler = ipv4_tcp_mem,
838 },
839 { }
840 };
841
842 static __net_init int ipv4_sysctl_init_net(struct net *net)
843 {
844 struct ctl_table *table;
845
846 table = ipv4_net_table;
847 if (!net_eq(net, &init_net)) {
848 table = kmemdup(table, sizeof(ipv4_net_table), GFP_KERNEL);
849 if (table == NULL)
850 goto err_alloc;
851
852 table[0].data =
853 &net->ipv4.sysctl_icmp_echo_ignore_all;
854 table[1].data =
855 &net->ipv4.sysctl_icmp_echo_ignore_broadcasts;
856 table[2].data =
857 &net->ipv4.sysctl_icmp_ignore_bogus_error_responses;
858 table[3].data =
859 &net->ipv4.sysctl_icmp_errors_use_inbound_ifaddr;
860 table[4].data =
861 &net->ipv4.sysctl_icmp_ratelimit;
862 table[5].data =
863 &net->ipv4.sysctl_icmp_ratemask;
864 table[6].data =
865 &net->ipv4.sysctl_ping_group_range;
866 table[7].data =
867 &net->ipv4.sysctl_tcp_ecn;
868 table[8].data =
869 &net->ipv4.sysctl_local_ports.range;
870
871 /* Don't export sysctls to unprivileged users */
872 if (net->user_ns != &init_user_ns)
873 table[0].procname = NULL;
874 }
875
876 /*
877 * Sane defaults - nobody may create ping sockets.
878 * Boot scripts should set this to distro-specific group.
879 */
880 net->ipv4.sysctl_ping_group_range[0] = make_kgid(&init_user_ns, 1);
881 net->ipv4.sysctl_ping_group_range[1] = make_kgid(&init_user_ns, 0);
882
883 /*
884 * Set defaults for local port range
885 */
886 seqlock_init(&net->ipv4.sysctl_local_ports.lock);
887 net->ipv4.sysctl_local_ports.range[0] = 32768;
888 net->ipv4.sysctl_local_ports.range[1] = 61000;
889
890 tcp_init_mem(net);
891
892 net->ipv4.ipv4_hdr = register_net_sysctl(net, "net/ipv4", table);
893 if (net->ipv4.ipv4_hdr == NULL)
894 goto err_reg;
895
896 return 0;
897
898 err_reg:
899 if (!net_eq(net, &init_net))
900 kfree(table);
901 err_alloc:
902 return -ENOMEM;
903 }
904
905 static __net_exit void ipv4_sysctl_exit_net(struct net *net)
906 {
907 struct ctl_table *table;
908
909 table = net->ipv4.ipv4_hdr->ctl_table_arg;
910 unregister_net_sysctl_table(net->ipv4.ipv4_hdr);
911 kfree(table);
912 }
913
914 static __net_initdata struct pernet_operations ipv4_sysctl_ops = {
915 .init = ipv4_sysctl_init_net,
916 .exit = ipv4_sysctl_exit_net,
917 };
918
919 static __init int sysctl_ipv4_init(void)
920 {
921 struct ctl_table_header *hdr;
922 struct ctl_table *i;
923
924 for (i = ipv4_table; i->procname; i++) {
925 if (strcmp(i->procname, "ip_local_reserved_ports") == 0) {
926 i->data = sysctl_local_reserved_ports;
927 break;
928 }
929 }
930 if (!i->procname)
931 return -EINVAL;
932
933 hdr = register_net_sysctl(&init_net, "net/ipv4", ipv4_table);
934 if (hdr == NULL)
935 return -ENOMEM;
936
937 if (register_pernet_subsys(&ipv4_sysctl_ops)) {
938 unregister_net_sysctl_table(hdr);
939 return -ENOMEM;
940 }
941
942 return 0;
943 }
944
945 __initcall(sysctl_ipv4_init);
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