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Merge tag 'mips_fixes_4.16_1' of git://git.kernel.org/pub/scm/linux/kernel/git/jhogan...
[mirror_ubuntu-eoan-kernel.git] / net / ipv4 / sysctl_net_ipv4.c
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
31 static int zero;
32 static int one = 1;
33 static int four = 4;
34 static int thousand = 1000;
35 static int gso_max_segs = GSO_MAX_SEGS;
36 static int tcp_retr1_max = 255;
37 static int ip_local_port_range_min[] = { 1, 1 };
38 static int ip_local_port_range_max[] = { 65535, 65535 };
39 static int tcp_adv_win_scale_min = -31;
40 static int tcp_adv_win_scale_max = 31;
41 static int ip_privileged_port_min;
42 static int ip_privileged_port_max = 65535;
43 static int ip_ttl_min = 1;
44 static int ip_ttl_max = 255;
45 static int tcp_syn_retries_min = 1;
46 static int tcp_syn_retries_max = MAX_TCP_SYNCNT;
47 static int ip_ping_group_range_min[] = { 0, 0 };
48 static int ip_ping_group_range_max[] = { GID_T_MAX, GID_T_MAX };
49
50 /* obsolete */
51 static int sysctl_tcp_low_latency __read_mostly;
52
53 /* Update system visible IP port range */
54 static void set_local_port_range(struct net *net, int range[2])
55 {
56 bool same_parity = !((range[0] ^ range[1]) & 1);
57
58 write_seqlock_bh(&net->ipv4.ip_local_ports.lock);
59 if (same_parity && !net->ipv4.ip_local_ports.warned) {
60 net->ipv4.ip_local_ports.warned = true;
61 pr_err_ratelimited("ip_local_port_range: prefer different parity for start/end values.\n");
62 }
63 net->ipv4.ip_local_ports.range[0] = range[0];
64 net->ipv4.ip_local_ports.range[1] = range[1];
65 write_sequnlock_bh(&net->ipv4.ip_local_ports.lock);
66 }
67
68 /* Validate changes from /proc interface. */
69 static int ipv4_local_port_range(struct ctl_table *table, int write,
70 void __user *buffer,
71 size_t *lenp, loff_t *ppos)
72 {
73 struct net *net =
74 container_of(table->data, struct net, ipv4.ip_local_ports.range);
75 int ret;
76 int range[2];
77 struct ctl_table tmp = {
78 .data = &range,
79 .maxlen = sizeof(range),
80 .mode = table->mode,
81 .extra1 = &ip_local_port_range_min,
82 .extra2 = &ip_local_port_range_max,
83 };
84
85 inet_get_local_port_range(net, &range[0], &range[1]);
86
87 ret = proc_dointvec_minmax(&tmp, write, buffer, lenp, ppos);
88
89 if (write && ret == 0) {
90 /* Ensure that the upper limit is not smaller than the lower,
91 * and that the lower does not encroach upon the privileged
92 * port limit.
93 */
94 if ((range[1] < range[0]) ||
95 (range[0] < net->ipv4.sysctl_ip_prot_sock))
96 ret = -EINVAL;
97 else
98 set_local_port_range(net, range);
99 }
100
101 return ret;
102 }
103
104 /* Validate changes from /proc interface. */
105 static int ipv4_privileged_ports(struct ctl_table *table, int write,
106 void __user *buffer, size_t *lenp, loff_t *ppos)
107 {
108 struct net *net = container_of(table->data, struct net,
109 ipv4.sysctl_ip_prot_sock);
110 int ret;
111 int pports;
112 int range[2];
113 struct ctl_table tmp = {
114 .data = &pports,
115 .maxlen = sizeof(pports),
116 .mode = table->mode,
117 .extra1 = &ip_privileged_port_min,
118 .extra2 = &ip_privileged_port_max,
119 };
120
121 pports = net->ipv4.sysctl_ip_prot_sock;
122
123 ret = proc_dointvec_minmax(&tmp, write, buffer, lenp, ppos);
124
125 if (write && ret == 0) {
126 inet_get_local_port_range(net, &range[0], &range[1]);
127 /* Ensure that the local port range doesn't overlap with the
128 * privileged port range.
129 */
130 if (range[0] < pports)
131 ret = -EINVAL;
132 else
133 net->ipv4.sysctl_ip_prot_sock = pports;
134 }
135
136 return ret;
137 }
138
139 static void inet_get_ping_group_range_table(struct ctl_table *table, kgid_t *low, kgid_t *high)
140 {
141 kgid_t *data = table->data;
142 struct net *net =
143 container_of(table->data, struct net, ipv4.ping_group_range.range);
144 unsigned int seq;
145 do {
146 seq = read_seqbegin(&net->ipv4.ping_group_range.lock);
147
148 *low = data[0];
149 *high = data[1];
150 } while (read_seqretry(&net->ipv4.ping_group_range.lock, seq));
151 }
152
153 /* Update system visible IP port range */
154 static void set_ping_group_range(struct ctl_table *table, kgid_t low, kgid_t high)
155 {
156 kgid_t *data = table->data;
157 struct net *net =
158 container_of(table->data, struct net, ipv4.ping_group_range.range);
159 write_seqlock(&net->ipv4.ping_group_range.lock);
160 data[0] = low;
161 data[1] = high;
162 write_sequnlock(&net->ipv4.ping_group_range.lock);
163 }
164
165 /* Validate changes from /proc interface. */
166 static int ipv4_ping_group_range(struct ctl_table *table, int write,
167 void __user *buffer,
168 size_t *lenp, loff_t *ppos)
169 {
170 struct user_namespace *user_ns = current_user_ns();
171 int ret;
172 gid_t urange[2];
173 kgid_t low, high;
174 struct ctl_table tmp = {
175 .data = &urange,
176 .maxlen = sizeof(urange),
177 .mode = table->mode,
178 .extra1 = &ip_ping_group_range_min,
179 .extra2 = &ip_ping_group_range_max,
180 };
181
182 inet_get_ping_group_range_table(table, &low, &high);
183 urange[0] = from_kgid_munged(user_ns, low);
184 urange[1] = from_kgid_munged(user_ns, high);
185 ret = proc_dointvec_minmax(&tmp, write, buffer, lenp, ppos);
186
187 if (write && ret == 0) {
188 low = make_kgid(user_ns, urange[0]);
189 high = make_kgid(user_ns, urange[1]);
190 if (!gid_valid(low) || !gid_valid(high) ||
191 (urange[1] < urange[0]) || gid_lt(high, low)) {
192 low = make_kgid(&init_user_ns, 1);
193 high = make_kgid(&init_user_ns, 0);
194 }
195 set_ping_group_range(table, low, high);
196 }
197
198 return ret;
199 }
200
201 static int proc_tcp_congestion_control(struct ctl_table *ctl, int write,
202 void __user *buffer, size_t *lenp, loff_t *ppos)
203 {
204 struct net *net = container_of(ctl->data, struct net,
205 ipv4.tcp_congestion_control);
206 char val[TCP_CA_NAME_MAX];
207 struct ctl_table tbl = {
208 .data = val,
209 .maxlen = TCP_CA_NAME_MAX,
210 };
211 int ret;
212
213 tcp_get_default_congestion_control(net, val);
214
215 ret = proc_dostring(&tbl, write, buffer, lenp, ppos);
216 if (write && ret == 0)
217 ret = tcp_set_default_congestion_control(net, val);
218 return ret;
219 }
220
221 static int proc_tcp_available_congestion_control(struct ctl_table *ctl,
222 int write,
223 void __user *buffer, size_t *lenp,
224 loff_t *ppos)
225 {
226 struct ctl_table tbl = { .maxlen = TCP_CA_BUF_MAX, };
227 int ret;
228
229 tbl.data = kmalloc(tbl.maxlen, GFP_USER);
230 if (!tbl.data)
231 return -ENOMEM;
232 tcp_get_available_congestion_control(tbl.data, TCP_CA_BUF_MAX);
233 ret = proc_dostring(&tbl, write, buffer, lenp, ppos);
234 kfree(tbl.data);
235 return ret;
236 }
237
238 static int proc_allowed_congestion_control(struct ctl_table *ctl,
239 int write,
240 void __user *buffer, size_t *lenp,
241 loff_t *ppos)
242 {
243 struct ctl_table tbl = { .maxlen = TCP_CA_BUF_MAX };
244 int ret;
245
246 tbl.data = kmalloc(tbl.maxlen, GFP_USER);
247 if (!tbl.data)
248 return -ENOMEM;
249
250 tcp_get_allowed_congestion_control(tbl.data, tbl.maxlen);
251 ret = proc_dostring(&tbl, write, buffer, lenp, ppos);
252 if (write && ret == 0)
253 ret = tcp_set_allowed_congestion_control(tbl.data);
254 kfree(tbl.data);
255 return ret;
256 }
257
258 static int proc_tcp_fastopen_key(struct ctl_table *table, int write,
259 void __user *buffer, size_t *lenp,
260 loff_t *ppos)
261 {
262 struct net *net = container_of(table->data, struct net,
263 ipv4.sysctl_tcp_fastopen);
264 struct ctl_table tbl = { .maxlen = (TCP_FASTOPEN_KEY_LENGTH * 2 + 10) };
265 struct tcp_fastopen_context *ctxt;
266 int ret;
267 u32 user_key[4]; /* 16 bytes, matching TCP_FASTOPEN_KEY_LENGTH */
268
269 tbl.data = kmalloc(tbl.maxlen, GFP_KERNEL);
270 if (!tbl.data)
271 return -ENOMEM;
272
273 rcu_read_lock();
274 ctxt = rcu_dereference(net->ipv4.tcp_fastopen_ctx);
275 if (ctxt)
276 memcpy(user_key, ctxt->key, TCP_FASTOPEN_KEY_LENGTH);
277 else
278 memset(user_key, 0, sizeof(user_key));
279 rcu_read_unlock();
280
281 snprintf(tbl.data, tbl.maxlen, "%08x-%08x-%08x-%08x",
282 user_key[0], user_key[1], user_key[2], user_key[3]);
283 ret = proc_dostring(&tbl, write, buffer, lenp, ppos);
284
285 if (write && ret == 0) {
286 if (sscanf(tbl.data, "%x-%x-%x-%x", user_key, user_key + 1,
287 user_key + 2, user_key + 3) != 4) {
288 ret = -EINVAL;
289 goto bad_key;
290 }
291 tcp_fastopen_reset_cipher(net, NULL, user_key,
292 TCP_FASTOPEN_KEY_LENGTH);
293 }
294
295 bad_key:
296 pr_debug("proc FO key set 0x%x-%x-%x-%x <- 0x%s: %u\n",
297 user_key[0], user_key[1], user_key[2], user_key[3],
298 (char *)tbl.data, ret);
299 kfree(tbl.data);
300 return ret;
301 }
302
303 static void proc_configure_early_demux(int enabled, int protocol)
304 {
305 struct net_protocol *ipprot;
306 #if IS_ENABLED(CONFIG_IPV6)
307 struct inet6_protocol *ip6prot;
308 #endif
309
310 rcu_read_lock();
311
312 ipprot = rcu_dereference(inet_protos[protocol]);
313 if (ipprot)
314 ipprot->early_demux = enabled ? ipprot->early_demux_handler :
315 NULL;
316
317 #if IS_ENABLED(CONFIG_IPV6)
318 ip6prot = rcu_dereference(inet6_protos[protocol]);
319 if (ip6prot)
320 ip6prot->early_demux = enabled ? ip6prot->early_demux_handler :
321 NULL;
322 #endif
323 rcu_read_unlock();
324 }
325
326 static int proc_tcp_early_demux(struct ctl_table *table, int write,
327 void __user *buffer, size_t *lenp, loff_t *ppos)
328 {
329 int ret = 0;
330
331 ret = proc_dointvec(table, write, buffer, lenp, ppos);
332
333 if (write && !ret) {
334 int enabled = init_net.ipv4.sysctl_tcp_early_demux;
335
336 proc_configure_early_demux(enabled, IPPROTO_TCP);
337 }
338
339 return ret;
340 }
341
342 static int proc_udp_early_demux(struct ctl_table *table, int write,
343 void __user *buffer, size_t *lenp, loff_t *ppos)
344 {
345 int ret = 0;
346
347 ret = proc_dointvec(table, write, buffer, lenp, ppos);
348
349 if (write && !ret) {
350 int enabled = init_net.ipv4.sysctl_udp_early_demux;
351
352 proc_configure_early_demux(enabled, IPPROTO_UDP);
353 }
354
355 return ret;
356 }
357
358 static int proc_tfo_blackhole_detect_timeout(struct ctl_table *table,
359 int write,
360 void __user *buffer,
361 size_t *lenp, loff_t *ppos)
362 {
363 struct net *net = container_of(table->data, struct net,
364 ipv4.sysctl_tcp_fastopen_blackhole_timeout);
365 int ret;
366
367 ret = proc_dointvec_minmax(table, write, buffer, lenp, ppos);
368 if (write && ret == 0)
369 atomic_set(&net->ipv4.tfo_active_disable_times, 0);
370
371 return ret;
372 }
373
374 static int proc_tcp_available_ulp(struct ctl_table *ctl,
375 int write,
376 void __user *buffer, size_t *lenp,
377 loff_t *ppos)
378 {
379 struct ctl_table tbl = { .maxlen = TCP_ULP_BUF_MAX, };
380 int ret;
381
382 tbl.data = kmalloc(tbl.maxlen, GFP_USER);
383 if (!tbl.data)
384 return -ENOMEM;
385 tcp_get_available_ulp(tbl.data, TCP_ULP_BUF_MAX);
386 ret = proc_dostring(&tbl, write, buffer, lenp, ppos);
387 kfree(tbl.data);
388
389 return ret;
390 }
391
392 #ifdef CONFIG_IP_ROUTE_MULTIPATH
393 static int proc_fib_multipath_hash_policy(struct ctl_table *table, int write,
394 void __user *buffer, size_t *lenp,
395 loff_t *ppos)
396 {
397 struct net *net = container_of(table->data, struct net,
398 ipv4.sysctl_fib_multipath_hash_policy);
399 int ret;
400
401 ret = proc_dointvec_minmax(table, write, buffer, lenp, ppos);
402 if (write && ret == 0)
403 call_netevent_notifiers(NETEVENT_MULTIPATH_HASH_UPDATE, net);
404
405 return ret;
406 }
407 #endif
408
409 static struct ctl_table ipv4_table[] = {
410 {
411 .procname = "tcp_max_orphans",
412 .data = &sysctl_tcp_max_orphans,
413 .maxlen = sizeof(int),
414 .mode = 0644,
415 .proc_handler = proc_dointvec
416 },
417 {
418 .procname = "inet_peer_threshold",
419 .data = &inet_peer_threshold,
420 .maxlen = sizeof(int),
421 .mode = 0644,
422 .proc_handler = proc_dointvec
423 },
424 {
425 .procname = "inet_peer_minttl",
426 .data = &inet_peer_minttl,
427 .maxlen = sizeof(int),
428 .mode = 0644,
429 .proc_handler = proc_dointvec_jiffies,
430 },
431 {
432 .procname = "inet_peer_maxttl",
433 .data = &inet_peer_maxttl,
434 .maxlen = sizeof(int),
435 .mode = 0644,
436 .proc_handler = proc_dointvec_jiffies,
437 },
438 {
439 .procname = "tcp_mem",
440 .maxlen = sizeof(sysctl_tcp_mem),
441 .data = &sysctl_tcp_mem,
442 .mode = 0644,
443 .proc_handler = proc_doulongvec_minmax,
444 },
445 {
446 .procname = "tcp_low_latency",
447 .data = &sysctl_tcp_low_latency,
448 .maxlen = sizeof(int),
449 .mode = 0644,
450 .proc_handler = proc_dointvec
451 },
452 #ifdef CONFIG_NETLABEL
453 {
454 .procname = "cipso_cache_enable",
455 .data = &cipso_v4_cache_enabled,
456 .maxlen = sizeof(int),
457 .mode = 0644,
458 .proc_handler = proc_dointvec,
459 },
460 {
461 .procname = "cipso_cache_bucket_size",
462 .data = &cipso_v4_cache_bucketsize,
463 .maxlen = sizeof(int),
464 .mode = 0644,
465 .proc_handler = proc_dointvec,
466 },
467 {
468 .procname = "cipso_rbm_optfmt",
469 .data = &cipso_v4_rbm_optfmt,
470 .maxlen = sizeof(int),
471 .mode = 0644,
472 .proc_handler = proc_dointvec,
473 },
474 {
475 .procname = "cipso_rbm_strictvalid",
476 .data = &cipso_v4_rbm_strictvalid,
477 .maxlen = sizeof(int),
478 .mode = 0644,
479 .proc_handler = proc_dointvec,
480 },
481 #endif /* CONFIG_NETLABEL */
482 {
483 .procname = "tcp_available_congestion_control",
484 .maxlen = TCP_CA_BUF_MAX,
485 .mode = 0444,
486 .proc_handler = proc_tcp_available_congestion_control,
487 },
488 {
489 .procname = "tcp_allowed_congestion_control",
490 .maxlen = TCP_CA_BUF_MAX,
491 .mode = 0644,
492 .proc_handler = proc_allowed_congestion_control,
493 },
494 {
495 .procname = "tcp_available_ulp",
496 .maxlen = TCP_ULP_BUF_MAX,
497 .mode = 0444,
498 .proc_handler = proc_tcp_available_ulp,
499 },
500 {
501 .procname = "icmp_msgs_per_sec",
502 .data = &sysctl_icmp_msgs_per_sec,
503 .maxlen = sizeof(int),
504 .mode = 0644,
505 .proc_handler = proc_dointvec_minmax,
506 .extra1 = &zero,
507 },
508 {
509 .procname = "icmp_msgs_burst",
510 .data = &sysctl_icmp_msgs_burst,
511 .maxlen = sizeof(int),
512 .mode = 0644,
513 .proc_handler = proc_dointvec_minmax,
514 .extra1 = &zero,
515 },
516 {
517 .procname = "udp_mem",
518 .data = &sysctl_udp_mem,
519 .maxlen = sizeof(sysctl_udp_mem),
520 .mode = 0644,
521 .proc_handler = proc_doulongvec_minmax,
522 },
523 {
524 .procname = "udp_rmem_min",
525 .data = &sysctl_udp_rmem_min,
526 .maxlen = sizeof(sysctl_udp_rmem_min),
527 .mode = 0644,
528 .proc_handler = proc_dointvec_minmax,
529 .extra1 = &one
530 },
531 {
532 .procname = "udp_wmem_min",
533 .data = &sysctl_udp_wmem_min,
534 .maxlen = sizeof(sysctl_udp_wmem_min),
535 .mode = 0644,
536 .proc_handler = proc_dointvec_minmax,
537 .extra1 = &one
538 },
539 { }
540 };
541
542 static struct ctl_table ipv4_net_table[] = {
543 {
544 .procname = "icmp_echo_ignore_all",
545 .data = &init_net.ipv4.sysctl_icmp_echo_ignore_all,
546 .maxlen = sizeof(int),
547 .mode = 0644,
548 .proc_handler = proc_dointvec
549 },
550 {
551 .procname = "icmp_echo_ignore_broadcasts",
552 .data = &init_net.ipv4.sysctl_icmp_echo_ignore_broadcasts,
553 .maxlen = sizeof(int),
554 .mode = 0644,
555 .proc_handler = proc_dointvec
556 },
557 {
558 .procname = "icmp_ignore_bogus_error_responses",
559 .data = &init_net.ipv4.sysctl_icmp_ignore_bogus_error_responses,
560 .maxlen = sizeof(int),
561 .mode = 0644,
562 .proc_handler = proc_dointvec
563 },
564 {
565 .procname = "icmp_errors_use_inbound_ifaddr",
566 .data = &init_net.ipv4.sysctl_icmp_errors_use_inbound_ifaddr,
567 .maxlen = sizeof(int),
568 .mode = 0644,
569 .proc_handler = proc_dointvec
570 },
571 {
572 .procname = "icmp_ratelimit",
573 .data = &init_net.ipv4.sysctl_icmp_ratelimit,
574 .maxlen = sizeof(int),
575 .mode = 0644,
576 .proc_handler = proc_dointvec_ms_jiffies,
577 },
578 {
579 .procname = "icmp_ratemask",
580 .data = &init_net.ipv4.sysctl_icmp_ratemask,
581 .maxlen = sizeof(int),
582 .mode = 0644,
583 .proc_handler = proc_dointvec
584 },
585 {
586 .procname = "ping_group_range",
587 .data = &init_net.ipv4.ping_group_range.range,
588 .maxlen = sizeof(gid_t)*2,
589 .mode = 0644,
590 .proc_handler = ipv4_ping_group_range,
591 },
592 {
593 .procname = "tcp_ecn",
594 .data = &init_net.ipv4.sysctl_tcp_ecn,
595 .maxlen = sizeof(int),
596 .mode = 0644,
597 .proc_handler = proc_dointvec
598 },
599 {
600 .procname = "tcp_ecn_fallback",
601 .data = &init_net.ipv4.sysctl_tcp_ecn_fallback,
602 .maxlen = sizeof(int),
603 .mode = 0644,
604 .proc_handler = proc_dointvec
605 },
606 {
607 .procname = "ip_dynaddr",
608 .data = &init_net.ipv4.sysctl_ip_dynaddr,
609 .maxlen = sizeof(int),
610 .mode = 0644,
611 .proc_handler = proc_dointvec
612 },
613 {
614 .procname = "ip_early_demux",
615 .data = &init_net.ipv4.sysctl_ip_early_demux,
616 .maxlen = sizeof(int),
617 .mode = 0644,
618 .proc_handler = proc_dointvec
619 },
620 {
621 .procname = "udp_early_demux",
622 .data = &init_net.ipv4.sysctl_udp_early_demux,
623 .maxlen = sizeof(int),
624 .mode = 0644,
625 .proc_handler = proc_udp_early_demux
626 },
627 {
628 .procname = "tcp_early_demux",
629 .data = &init_net.ipv4.sysctl_tcp_early_demux,
630 .maxlen = sizeof(int),
631 .mode = 0644,
632 .proc_handler = proc_tcp_early_demux
633 },
634 {
635 .procname = "ip_default_ttl",
636 .data = &init_net.ipv4.sysctl_ip_default_ttl,
637 .maxlen = sizeof(int),
638 .mode = 0644,
639 .proc_handler = proc_dointvec_minmax,
640 .extra1 = &ip_ttl_min,
641 .extra2 = &ip_ttl_max,
642 },
643 {
644 .procname = "ip_local_port_range",
645 .maxlen = sizeof(init_net.ipv4.ip_local_ports.range),
646 .data = &init_net.ipv4.ip_local_ports.range,
647 .mode = 0644,
648 .proc_handler = ipv4_local_port_range,
649 },
650 {
651 .procname = "ip_local_reserved_ports",
652 .data = &init_net.ipv4.sysctl_local_reserved_ports,
653 .maxlen = 65536,
654 .mode = 0644,
655 .proc_handler = proc_do_large_bitmap,
656 },
657 {
658 .procname = "ip_no_pmtu_disc",
659 .data = &init_net.ipv4.sysctl_ip_no_pmtu_disc,
660 .maxlen = sizeof(int),
661 .mode = 0644,
662 .proc_handler = proc_dointvec
663 },
664 {
665 .procname = "ip_forward_use_pmtu",
666 .data = &init_net.ipv4.sysctl_ip_fwd_use_pmtu,
667 .maxlen = sizeof(int),
668 .mode = 0644,
669 .proc_handler = proc_dointvec,
670 },
671 {
672 .procname = "ip_nonlocal_bind",
673 .data = &init_net.ipv4.sysctl_ip_nonlocal_bind,
674 .maxlen = sizeof(int),
675 .mode = 0644,
676 .proc_handler = proc_dointvec
677 },
678 {
679 .procname = "fwmark_reflect",
680 .data = &init_net.ipv4.sysctl_fwmark_reflect,
681 .maxlen = sizeof(int),
682 .mode = 0644,
683 .proc_handler = proc_dointvec,
684 },
685 {
686 .procname = "tcp_fwmark_accept",
687 .data = &init_net.ipv4.sysctl_tcp_fwmark_accept,
688 .maxlen = sizeof(int),
689 .mode = 0644,
690 .proc_handler = proc_dointvec,
691 },
692 #ifdef CONFIG_NET_L3_MASTER_DEV
693 {
694 .procname = "tcp_l3mdev_accept",
695 .data = &init_net.ipv4.sysctl_tcp_l3mdev_accept,
696 .maxlen = sizeof(int),
697 .mode = 0644,
698 .proc_handler = proc_dointvec_minmax,
699 .extra1 = &zero,
700 .extra2 = &one,
701 },
702 #endif
703 {
704 .procname = "tcp_mtu_probing",
705 .data = &init_net.ipv4.sysctl_tcp_mtu_probing,
706 .maxlen = sizeof(int),
707 .mode = 0644,
708 .proc_handler = proc_dointvec,
709 },
710 {
711 .procname = "tcp_base_mss",
712 .data = &init_net.ipv4.sysctl_tcp_base_mss,
713 .maxlen = sizeof(int),
714 .mode = 0644,
715 .proc_handler = proc_dointvec,
716 },
717 {
718 .procname = "tcp_probe_threshold",
719 .data = &init_net.ipv4.sysctl_tcp_probe_threshold,
720 .maxlen = sizeof(int),
721 .mode = 0644,
722 .proc_handler = proc_dointvec,
723 },
724 {
725 .procname = "tcp_probe_interval",
726 .data = &init_net.ipv4.sysctl_tcp_probe_interval,
727 .maxlen = sizeof(int),
728 .mode = 0644,
729 .proc_handler = proc_dointvec,
730 },
731 {
732 .procname = "igmp_link_local_mcast_reports",
733 .data = &init_net.ipv4.sysctl_igmp_llm_reports,
734 .maxlen = sizeof(int),
735 .mode = 0644,
736 .proc_handler = proc_dointvec
737 },
738 {
739 .procname = "igmp_max_memberships",
740 .data = &init_net.ipv4.sysctl_igmp_max_memberships,
741 .maxlen = sizeof(int),
742 .mode = 0644,
743 .proc_handler = proc_dointvec
744 },
745 {
746 .procname = "igmp_max_msf",
747 .data = &init_net.ipv4.sysctl_igmp_max_msf,
748 .maxlen = sizeof(int),
749 .mode = 0644,
750 .proc_handler = proc_dointvec
751 },
752 #ifdef CONFIG_IP_MULTICAST
753 {
754 .procname = "igmp_qrv",
755 .data = &init_net.ipv4.sysctl_igmp_qrv,
756 .maxlen = sizeof(int),
757 .mode = 0644,
758 .proc_handler = proc_dointvec_minmax,
759 .extra1 = &one
760 },
761 #endif
762 {
763 .procname = "tcp_congestion_control",
764 .data = &init_net.ipv4.tcp_congestion_control,
765 .mode = 0644,
766 .maxlen = TCP_CA_NAME_MAX,
767 .proc_handler = proc_tcp_congestion_control,
768 },
769 {
770 .procname = "tcp_keepalive_time",
771 .data = &init_net.ipv4.sysctl_tcp_keepalive_time,
772 .maxlen = sizeof(int),
773 .mode = 0644,
774 .proc_handler = proc_dointvec_jiffies,
775 },
776 {
777 .procname = "tcp_keepalive_probes",
778 .data = &init_net.ipv4.sysctl_tcp_keepalive_probes,
779 .maxlen = sizeof(int),
780 .mode = 0644,
781 .proc_handler = proc_dointvec
782 },
783 {
784 .procname = "tcp_keepalive_intvl",
785 .data = &init_net.ipv4.sysctl_tcp_keepalive_intvl,
786 .maxlen = sizeof(int),
787 .mode = 0644,
788 .proc_handler = proc_dointvec_jiffies,
789 },
790 {
791 .procname = "tcp_syn_retries",
792 .data = &init_net.ipv4.sysctl_tcp_syn_retries,
793 .maxlen = sizeof(int),
794 .mode = 0644,
795 .proc_handler = proc_dointvec_minmax,
796 .extra1 = &tcp_syn_retries_min,
797 .extra2 = &tcp_syn_retries_max
798 },
799 {
800 .procname = "tcp_synack_retries",
801 .data = &init_net.ipv4.sysctl_tcp_synack_retries,
802 .maxlen = sizeof(int),
803 .mode = 0644,
804 .proc_handler = proc_dointvec
805 },
806 #ifdef CONFIG_SYN_COOKIES
807 {
808 .procname = "tcp_syncookies",
809 .data = &init_net.ipv4.sysctl_tcp_syncookies,
810 .maxlen = sizeof(int),
811 .mode = 0644,
812 .proc_handler = proc_dointvec
813 },
814 #endif
815 {
816 .procname = "tcp_reordering",
817 .data = &init_net.ipv4.sysctl_tcp_reordering,
818 .maxlen = sizeof(int),
819 .mode = 0644,
820 .proc_handler = proc_dointvec
821 },
822 {
823 .procname = "tcp_retries1",
824 .data = &init_net.ipv4.sysctl_tcp_retries1,
825 .maxlen = sizeof(int),
826 .mode = 0644,
827 .proc_handler = proc_dointvec_minmax,
828 .extra2 = &tcp_retr1_max
829 },
830 {
831 .procname = "tcp_retries2",
832 .data = &init_net.ipv4.sysctl_tcp_retries2,
833 .maxlen = sizeof(int),
834 .mode = 0644,
835 .proc_handler = proc_dointvec
836 },
837 {
838 .procname = "tcp_orphan_retries",
839 .data = &init_net.ipv4.sysctl_tcp_orphan_retries,
840 .maxlen = sizeof(int),
841 .mode = 0644,
842 .proc_handler = proc_dointvec
843 },
844 {
845 .procname = "tcp_fin_timeout",
846 .data = &init_net.ipv4.sysctl_tcp_fin_timeout,
847 .maxlen = sizeof(int),
848 .mode = 0644,
849 .proc_handler = proc_dointvec_jiffies,
850 },
851 {
852 .procname = "tcp_notsent_lowat",
853 .data = &init_net.ipv4.sysctl_tcp_notsent_lowat,
854 .maxlen = sizeof(unsigned int),
855 .mode = 0644,
856 .proc_handler = proc_douintvec,
857 },
858 {
859 .procname = "tcp_tw_reuse",
860 .data = &init_net.ipv4.sysctl_tcp_tw_reuse,
861 .maxlen = sizeof(int),
862 .mode = 0644,
863 .proc_handler = proc_dointvec
864 },
865 {
866 .procname = "tcp_max_tw_buckets",
867 .data = &init_net.ipv4.tcp_death_row.sysctl_max_tw_buckets,
868 .maxlen = sizeof(int),
869 .mode = 0644,
870 .proc_handler = proc_dointvec
871 },
872 {
873 .procname = "tcp_max_syn_backlog",
874 .data = &init_net.ipv4.sysctl_max_syn_backlog,
875 .maxlen = sizeof(int),
876 .mode = 0644,
877 .proc_handler = proc_dointvec
878 },
879 {
880 .procname = "tcp_fastopen",
881 .data = &init_net.ipv4.sysctl_tcp_fastopen,
882 .maxlen = sizeof(int),
883 .mode = 0644,
884 .proc_handler = proc_dointvec,
885 },
886 {
887 .procname = "tcp_fastopen_key",
888 .mode = 0600,
889 .data = &init_net.ipv4.sysctl_tcp_fastopen,
890 .maxlen = ((TCP_FASTOPEN_KEY_LENGTH * 2) + 10),
891 .proc_handler = proc_tcp_fastopen_key,
892 },
893 {
894 .procname = "tcp_fastopen_blackhole_timeout_sec",
895 .data = &init_net.ipv4.sysctl_tcp_fastopen_blackhole_timeout,
896 .maxlen = sizeof(int),
897 .mode = 0644,
898 .proc_handler = proc_tfo_blackhole_detect_timeout,
899 .extra1 = &zero,
900 },
901 #ifdef CONFIG_IP_ROUTE_MULTIPATH
902 {
903 .procname = "fib_multipath_use_neigh",
904 .data = &init_net.ipv4.sysctl_fib_multipath_use_neigh,
905 .maxlen = sizeof(int),
906 .mode = 0644,
907 .proc_handler = proc_dointvec_minmax,
908 .extra1 = &zero,
909 .extra2 = &one,
910 },
911 {
912 .procname = "fib_multipath_hash_policy",
913 .data = &init_net.ipv4.sysctl_fib_multipath_hash_policy,
914 .maxlen = sizeof(int),
915 .mode = 0644,
916 .proc_handler = proc_fib_multipath_hash_policy,
917 .extra1 = &zero,
918 .extra2 = &one,
919 },
920 #endif
921 {
922 .procname = "ip_unprivileged_port_start",
923 .maxlen = sizeof(int),
924 .data = &init_net.ipv4.sysctl_ip_prot_sock,
925 .mode = 0644,
926 .proc_handler = ipv4_privileged_ports,
927 },
928 #ifdef CONFIG_NET_L3_MASTER_DEV
929 {
930 .procname = "udp_l3mdev_accept",
931 .data = &init_net.ipv4.sysctl_udp_l3mdev_accept,
932 .maxlen = sizeof(int),
933 .mode = 0644,
934 .proc_handler = proc_dointvec_minmax,
935 .extra1 = &zero,
936 .extra2 = &one,
937 },
938 #endif
939 {
940 .procname = "tcp_sack",
941 .data = &init_net.ipv4.sysctl_tcp_sack,
942 .maxlen = sizeof(int),
943 .mode = 0644,
944 .proc_handler = proc_dointvec
945 },
946 {
947 .procname = "tcp_window_scaling",
948 .data = &init_net.ipv4.sysctl_tcp_window_scaling,
949 .maxlen = sizeof(int),
950 .mode = 0644,
951 .proc_handler = proc_dointvec
952 },
953 {
954 .procname = "tcp_timestamps",
955 .data = &init_net.ipv4.sysctl_tcp_timestamps,
956 .maxlen = sizeof(int),
957 .mode = 0644,
958 .proc_handler = proc_dointvec
959 },
960 {
961 .procname = "tcp_early_retrans",
962 .data = &init_net.ipv4.sysctl_tcp_early_retrans,
963 .maxlen = sizeof(int),
964 .mode = 0644,
965 .proc_handler = proc_dointvec_minmax,
966 .extra1 = &zero,
967 .extra2 = &four,
968 },
969 {
970 .procname = "tcp_recovery",
971 .data = &init_net.ipv4.sysctl_tcp_recovery,
972 .maxlen = sizeof(int),
973 .mode = 0644,
974 .proc_handler = proc_dointvec,
975 },
976 {
977 .procname = "tcp_thin_linear_timeouts",
978 .data = &init_net.ipv4.sysctl_tcp_thin_linear_timeouts,
979 .maxlen = sizeof(int),
980 .mode = 0644,
981 .proc_handler = proc_dointvec
982 },
983 {
984 .procname = "tcp_slow_start_after_idle",
985 .data = &init_net.ipv4.sysctl_tcp_slow_start_after_idle,
986 .maxlen = sizeof(int),
987 .mode = 0644,
988 .proc_handler = proc_dointvec
989 },
990 {
991 .procname = "tcp_retrans_collapse",
992 .data = &init_net.ipv4.sysctl_tcp_retrans_collapse,
993 .maxlen = sizeof(int),
994 .mode = 0644,
995 .proc_handler = proc_dointvec
996 },
997 {
998 .procname = "tcp_stdurg",
999 .data = &init_net.ipv4.sysctl_tcp_stdurg,
1000 .maxlen = sizeof(int),
1001 .mode = 0644,
1002 .proc_handler = proc_dointvec
1003 },
1004 {
1005 .procname = "tcp_rfc1337",
1006 .data = &init_net.ipv4.sysctl_tcp_rfc1337,
1007 .maxlen = sizeof(int),
1008 .mode = 0644,
1009 .proc_handler = proc_dointvec
1010 },
1011 {
1012 .procname = "tcp_abort_on_overflow",
1013 .data = &init_net.ipv4.sysctl_tcp_abort_on_overflow,
1014 .maxlen = sizeof(int),
1015 .mode = 0644,
1016 .proc_handler = proc_dointvec
1017 },
1018 {
1019 .procname = "tcp_fack",
1020 .data = &init_net.ipv4.sysctl_tcp_fack,
1021 .maxlen = sizeof(int),
1022 .mode = 0644,
1023 .proc_handler = proc_dointvec
1024 },
1025 {
1026 .procname = "tcp_max_reordering",
1027 .data = &init_net.ipv4.sysctl_tcp_max_reordering,
1028 .maxlen = sizeof(int),
1029 .mode = 0644,
1030 .proc_handler = proc_dointvec
1031 },
1032 {
1033 .procname = "tcp_dsack",
1034 .data = &init_net.ipv4.sysctl_tcp_dsack,
1035 .maxlen = sizeof(int),
1036 .mode = 0644,
1037 .proc_handler = proc_dointvec
1038 },
1039 {
1040 .procname = "tcp_app_win",
1041 .data = &init_net.ipv4.sysctl_tcp_app_win,
1042 .maxlen = sizeof(int),
1043 .mode = 0644,
1044 .proc_handler = proc_dointvec
1045 },
1046 {
1047 .procname = "tcp_adv_win_scale",
1048 .data = &init_net.ipv4.sysctl_tcp_adv_win_scale,
1049 .maxlen = sizeof(int),
1050 .mode = 0644,
1051 .proc_handler = proc_dointvec_minmax,
1052 .extra1 = &tcp_adv_win_scale_min,
1053 .extra2 = &tcp_adv_win_scale_max,
1054 },
1055 {
1056 .procname = "tcp_frto",
1057 .data = &init_net.ipv4.sysctl_tcp_frto,
1058 .maxlen = sizeof(int),
1059 .mode = 0644,
1060 .proc_handler = proc_dointvec
1061 },
1062 {
1063 .procname = "tcp_no_metrics_save",
1064 .data = &init_net.ipv4.sysctl_tcp_nometrics_save,
1065 .maxlen = sizeof(int),
1066 .mode = 0644,
1067 .proc_handler = proc_dointvec,
1068 },
1069 {
1070 .procname = "tcp_moderate_rcvbuf",
1071 .data = &init_net.ipv4.sysctl_tcp_moderate_rcvbuf,
1072 .maxlen = sizeof(int),
1073 .mode = 0644,
1074 .proc_handler = proc_dointvec,
1075 },
1076 {
1077 .procname = "tcp_tso_win_divisor",
1078 .data = &init_net.ipv4.sysctl_tcp_tso_win_divisor,
1079 .maxlen = sizeof(int),
1080 .mode = 0644,
1081 .proc_handler = proc_dointvec,
1082 },
1083 {
1084 .procname = "tcp_workaround_signed_windows",
1085 .data = &init_net.ipv4.sysctl_tcp_workaround_signed_windows,
1086 .maxlen = sizeof(int),
1087 .mode = 0644,
1088 .proc_handler = proc_dointvec
1089 },
1090 {
1091 .procname = "tcp_limit_output_bytes",
1092 .data = &init_net.ipv4.sysctl_tcp_limit_output_bytes,
1093 .maxlen = sizeof(int),
1094 .mode = 0644,
1095 .proc_handler = proc_dointvec
1096 },
1097 {
1098 .procname = "tcp_challenge_ack_limit",
1099 .data = &init_net.ipv4.sysctl_tcp_challenge_ack_limit,
1100 .maxlen = sizeof(int),
1101 .mode = 0644,
1102 .proc_handler = proc_dointvec
1103 },
1104 {
1105 .procname = "tcp_min_tso_segs",
1106 .data = &init_net.ipv4.sysctl_tcp_min_tso_segs,
1107 .maxlen = sizeof(int),
1108 .mode = 0644,
1109 .proc_handler = proc_dointvec_minmax,
1110 .extra1 = &one,
1111 .extra2 = &gso_max_segs,
1112 },
1113 {
1114 .procname = "tcp_min_rtt_wlen",
1115 .data = &init_net.ipv4.sysctl_tcp_min_rtt_wlen,
1116 .maxlen = sizeof(int),
1117 .mode = 0644,
1118 .proc_handler = proc_dointvec
1119 },
1120 {
1121 .procname = "tcp_autocorking",
1122 .data = &init_net.ipv4.sysctl_tcp_autocorking,
1123 .maxlen = sizeof(int),
1124 .mode = 0644,
1125 .proc_handler = proc_dointvec_minmax,
1126 .extra1 = &zero,
1127 .extra2 = &one,
1128 },
1129 {
1130 .procname = "tcp_invalid_ratelimit",
1131 .data = &init_net.ipv4.sysctl_tcp_invalid_ratelimit,
1132 .maxlen = sizeof(int),
1133 .mode = 0644,
1134 .proc_handler = proc_dointvec_ms_jiffies,
1135 },
1136 {
1137 .procname = "tcp_pacing_ss_ratio",
1138 .data = &init_net.ipv4.sysctl_tcp_pacing_ss_ratio,
1139 .maxlen = sizeof(int),
1140 .mode = 0644,
1141 .proc_handler = proc_dointvec_minmax,
1142 .extra1 = &zero,
1143 .extra2 = &thousand,
1144 },
1145 {
1146 .procname = "tcp_pacing_ca_ratio",
1147 .data = &init_net.ipv4.sysctl_tcp_pacing_ca_ratio,
1148 .maxlen = sizeof(int),
1149 .mode = 0644,
1150 .proc_handler = proc_dointvec_minmax,
1151 .extra1 = &zero,
1152 .extra2 = &thousand,
1153 },
1154 {
1155 .procname = "tcp_wmem",
1156 .data = &init_net.ipv4.sysctl_tcp_wmem,
1157 .maxlen = sizeof(init_net.ipv4.sysctl_tcp_wmem),
1158 .mode = 0644,
1159 .proc_handler = proc_dointvec_minmax,
1160 .extra1 = &one,
1161 },
1162 {
1163 .procname = "tcp_rmem",
1164 .data = &init_net.ipv4.sysctl_tcp_rmem,
1165 .maxlen = sizeof(init_net.ipv4.sysctl_tcp_rmem),
1166 .mode = 0644,
1167 .proc_handler = proc_dointvec_minmax,
1168 .extra1 = &one,
1169 },
1170 { }
1171 };
1172
1173 static __net_init int ipv4_sysctl_init_net(struct net *net)
1174 {
1175 struct ctl_table *table;
1176
1177 table = ipv4_net_table;
1178 if (!net_eq(net, &init_net)) {
1179 int i;
1180
1181 table = kmemdup(table, sizeof(ipv4_net_table), GFP_KERNEL);
1182 if (!table)
1183 goto err_alloc;
1184
1185 /* Update the variables to point into the current struct net */
1186 for (i = 0; i < ARRAY_SIZE(ipv4_net_table) - 1; i++)
1187 table[i].data += (void *)net - (void *)&init_net;
1188 }
1189
1190 net->ipv4.ipv4_hdr = register_net_sysctl(net, "net/ipv4", table);
1191 if (!net->ipv4.ipv4_hdr)
1192 goto err_reg;
1193
1194 net->ipv4.sysctl_local_reserved_ports = kzalloc(65536 / 8, GFP_KERNEL);
1195 if (!net->ipv4.sysctl_local_reserved_ports)
1196 goto err_ports;
1197
1198 return 0;
1199
1200 err_ports:
1201 unregister_net_sysctl_table(net->ipv4.ipv4_hdr);
1202 err_reg:
1203 if (!net_eq(net, &init_net))
1204 kfree(table);
1205 err_alloc:
1206 return -ENOMEM;
1207 }
1208
1209 static __net_exit void ipv4_sysctl_exit_net(struct net *net)
1210 {
1211 struct ctl_table *table;
1212
1213 kfree(net->ipv4.sysctl_local_reserved_ports);
1214 table = net->ipv4.ipv4_hdr->ctl_table_arg;
1215 unregister_net_sysctl_table(net->ipv4.ipv4_hdr);
1216 kfree(table);
1217 }
1218
1219 static __net_initdata struct pernet_operations ipv4_sysctl_ops = {
1220 .init = ipv4_sysctl_init_net,
1221 .exit = ipv4_sysctl_exit_net,
1222 };
1223
1224 static __init int sysctl_ipv4_init(void)
1225 {
1226 struct ctl_table_header *hdr;
1227
1228 hdr = register_net_sysctl(&init_net, "net/ipv4", ipv4_table);
1229 if (!hdr)
1230 return -ENOMEM;
1231
1232 if (register_pernet_subsys(&ipv4_sysctl_ops)) {
1233 unregister_net_sysctl_table(hdr);
1234 return -ENOMEM;
1235 }
1236
1237 return 0;
1238 }
1239
1240 __initcall(sysctl_ipv4_init);
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