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fs/adfs: move append_filetype_suffix() into adfs_object_fixup()
[linux-2.6/linux-2.6-arm.git] / net / ipv4 / sysctl_net_ipv4.c
blobeeb4041fa5f905fb0f7c91ea6d74851ae97259f8
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 two = 2;
34 static int four = 4;
35 static int thousand = 1000;
36 static int gso_max_segs = GSO_MAX_SEGS;
37 static int tcp_retr1_max = 255;
38 static int ip_local_port_range_min[] = { 1, 1 };
39 static int ip_local_port_range_max[] = { 65535, 65535 };
40 static int tcp_adv_win_scale_min = -31;
41 static int tcp_adv_win_scale_max = 31;
42 static int ip_privileged_port_min;
43 static int ip_privileged_port_max = 65535;
44 static int ip_ttl_min = 1;
45 static int ip_ttl_max = 255;
46 static int tcp_syn_retries_min = 1;
47 static int tcp_syn_retries_max = MAX_TCP_SYNCNT;
48 static int ip_ping_group_range_min[] = { 0, 0 };
49 static int ip_ping_group_range_max[] = { GID_T_MAX, GID_T_MAX };
50 static int comp_sack_nr_max = 255;
51 static u32 u32_max_div_HZ = UINT_MAX / HZ;
52 static int one_day_secs = 24 * 3600;
53
54 /* obsolete */
55 static int sysctl_tcp_low_latency __read_mostly;
56
57 /* Update system visible IP port range */
58 static 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. */
73 static int ipv4_local_port_range(struct ctl_table *table, int write,
74 void __user *buffer,
75 size_t *lenp, loff_t *ppos)
76 {
77 struct net *net =
78 container_of(table->data, struct net, ipv4.ip_local_ports.range);
79 int ret;
80 int range[2];
81 struct ctl_table tmp = {
82 .data = &range,
83 .maxlen = sizeof(range),
84 .mode = table->mode,
85 .extra1 = &ip_local_port_range_min,
86 .extra2 = &ip_local_port_range_max,
87 };
88
89 inet_get_local_port_range(net, &range[0], &range[1]);
90
91 ret = proc_dointvec_minmax(&tmp, write, buffer, lenp, ppos);
92
93 if (write && ret == 0) {
94 /* Ensure that the upper limit is not smaller than the lower,
95 * and that the lower does not encroach upon the privileged
96 * port limit.
97 */
98 if ((range[1] < range[0]) ||
99 (range[0] < net->ipv4.sysctl_ip_prot_sock))
100 ret = -EINVAL;
101 else
102 set_local_port_range(net, range);
103 }
104
105 return ret;
106 }
107
108 /* Validate changes from /proc interface. */
109 static int ipv4_privileged_ports(struct ctl_table *table, int write,
110 void __user *buffer, size_t *lenp, loff_t *ppos)
111 {
112 struct net *net = container_of(table->data, struct net,
113 ipv4.sysctl_ip_prot_sock);
114 int ret;
115 int pports;
116 int range[2];
117 struct ctl_table tmp = {
118 .data = &pports,
119 .maxlen = sizeof(pports),
120 .mode = table->mode,
121 .extra1 = &ip_privileged_port_min,
122 .extra2 = &ip_privileged_port_max,
123 };
124
125 pports = net->ipv4.sysctl_ip_prot_sock;
126
127 ret = proc_dointvec_minmax(&tmp, write, buffer, lenp, ppos);
128
129 if (write && ret == 0) {
130 inet_get_local_port_range(net, &range[0], &range[1]);
131 /* Ensure that the local port range doesn't overlap with the
132 * privileged port range.
133 */
134 if (range[0] < pports)
135 ret = -EINVAL;
136 else
137 net->ipv4.sysctl_ip_prot_sock = pports;
138 }
139
140 return ret;
141 }
142
143 static void inet_get_ping_group_range_table(struct ctl_table *table, kgid_t *low, kgid_t *high)
144 {
145 kgid_t *data = table->data;
146 struct net *net =
147 container_of(table->data, struct net, ipv4.ping_group_range.range);
148 unsigned int seq;
149 do {
150 seq = read_seqbegin(&net->ipv4.ping_group_range.lock);
151
152 *low = data[0];
153 *high = data[1];
154 } while (read_seqretry(&net->ipv4.ping_group_range.lock, seq));
155 }
156
157 /* Update system visible IP port range */
158 static void set_ping_group_range(struct ctl_table *table, kgid_t low, kgid_t high)
159 {
160 kgid_t *data = table->data;
161 struct net *net =
162 container_of(table->data, struct net, ipv4.ping_group_range.range);
163 write_seqlock(&net->ipv4.ping_group_range.lock);
164 data[0] = low;
165 data[1] = high;
166 write_sequnlock(&net->ipv4.ping_group_range.lock);
167 }
168
169 /* Validate changes from /proc interface. */
170 static int ipv4_ping_group_range(struct ctl_table *table, int write,
171 void __user *buffer,
172 size_t *lenp, loff_t *ppos)
173 {
174 struct user_namespace *user_ns = current_user_ns();
175 int ret;
176 gid_t urange[2];
177 kgid_t low, high;
178 struct ctl_table tmp = {
179 .data = &urange,
180 .maxlen = sizeof(urange),
181 .mode = table->mode,
182 .extra1 = &ip_ping_group_range_min,
183 .extra2 = &ip_ping_group_range_max,
184 };
185
186 inet_get_ping_group_range_table(table, &low, &high);
187 urange[0] = from_kgid_munged(user_ns, low);
188 urange[1] = from_kgid_munged(user_ns, high);
189 ret = proc_dointvec_minmax(&tmp, write, buffer, lenp, ppos);
190
191 if (write && ret == 0) {
192 low = make_kgid(user_ns, urange[0]);
193 high = make_kgid(user_ns, urange[1]);
194 if (!gid_valid(low) || !gid_valid(high))
195 return -EINVAL;
196 if (urange[1] < urange[0] || gid_lt(high, low)) {
197 low = make_kgid(&init_user_ns, 1);
198 high = make_kgid(&init_user_ns, 0);
199 }
200 set_ping_group_range(table, low, high);
201 }
202
203 return ret;
204 }
205
206 static int ipv4_fwd_update_priority(struct ctl_table *table, int write,
207 void __user *buffer,
208 size_t *lenp, loff_t *ppos)
209 {
210 struct net *net;
211 int ret;
212
213 net = container_of(table->data, struct net,
214 ipv4.sysctl_ip_fwd_update_priority);
215 ret = proc_dointvec_minmax(table, write, buffer, lenp, ppos);
216 if (write && ret == 0)
217 call_netevent_notifiers(NETEVENT_IPV4_FWD_UPDATE_PRIORITY_UPDATE,
218 net);
219
220 return ret;
221 }
222
223 static int proc_tcp_congestion_control(struct ctl_table *ctl, int write,
224 void __user *buffer, size_t *lenp, loff_t *ppos)
225 {
226 struct net *net = container_of(ctl->data, struct net,
227 ipv4.tcp_congestion_control);
228 char val[TCP_CA_NAME_MAX];
229 struct ctl_table tbl = {
230 .data = val,
231 .maxlen = TCP_CA_NAME_MAX,
232 };
233 int ret;
234
235 tcp_get_default_congestion_control(net, val);
236
237 ret = proc_dostring(&tbl, write, buffer, lenp, ppos);
238 if (write && ret == 0)
239 ret = tcp_set_default_congestion_control(net, val);
240 return ret;
241 }
242
243 static int proc_tcp_available_congestion_control(struct ctl_table *ctl,
244 int write,
245 void __user *buffer, size_t *lenp,
246 loff_t *ppos)
247 {
248 struct ctl_table tbl = { .maxlen = TCP_CA_BUF_MAX, };
249 int ret;
250
251 tbl.data = kmalloc(tbl.maxlen, GFP_USER);
252 if (!tbl.data)
253 return -ENOMEM;
254 tcp_get_available_congestion_control(tbl.data, TCP_CA_BUF_MAX);
255 ret = proc_dostring(&tbl, write, buffer, lenp, ppos);
256 kfree(tbl.data);
257 return ret;
258 }
259
260 static int proc_allowed_congestion_control(struct ctl_table *ctl,
261 int write,
262 void __user *buffer, size_t *lenp,
263 loff_t *ppos)
264 {
265 struct ctl_table tbl = { .maxlen = TCP_CA_BUF_MAX };
266 int ret;
267
268 tbl.data = kmalloc(tbl.maxlen, GFP_USER);
269 if (!tbl.data)
270 return -ENOMEM;
271
272 tcp_get_allowed_congestion_control(tbl.data, tbl.maxlen);
273 ret = proc_dostring(&tbl, write, buffer, lenp, ppos);
274 if (write && ret == 0)
275 ret = tcp_set_allowed_congestion_control(tbl.data);
276 kfree(tbl.data);
277 return ret;
278 }
279
280 static int proc_tcp_fastopen_key(struct ctl_table *table, int write,
281 void __user *buffer, size_t *lenp,
282 loff_t *ppos)
283 {
284 struct net *net = container_of(table->data, struct net,
285 ipv4.sysctl_tcp_fastopen);
286 struct ctl_table tbl = { .maxlen = (TCP_FASTOPEN_KEY_LENGTH * 2 + 10) };
287 struct tcp_fastopen_context *ctxt;
288 u32 user_key[4]; /* 16 bytes, matching TCP_FASTOPEN_KEY_LENGTH */
289 __le32 key[4];
290 int ret, i;
291
292 tbl.data = kmalloc(tbl.maxlen, GFP_KERNEL);
293 if (!tbl.data)
294 return -ENOMEM;
295
296 rcu_read_lock();
297 ctxt = rcu_dereference(net->ipv4.tcp_fastopen_ctx);
298 if (ctxt)
299 memcpy(key, ctxt->key, TCP_FASTOPEN_KEY_LENGTH);
300 else
301 memset(key, 0, sizeof(key));
302 rcu_read_unlock();
303
304 for (i = 0; i < ARRAY_SIZE(key); i++)
305 user_key[i] = le32_to_cpu(key[i]);
306
307 snprintf(tbl.data, tbl.maxlen, "%08x-%08x-%08x-%08x",
308 user_key[0], user_key[1], user_key[2], user_key[3]);
309 ret = proc_dostring(&tbl, write, buffer, lenp, ppos);
310
311 if (write && ret == 0) {
312 if (sscanf(tbl.data, "%x-%x-%x-%x", user_key, user_key + 1,
313 user_key + 2, user_key + 3) != 4) {
314 ret = -EINVAL;
315 goto bad_key;
316 }
317
318 for (i = 0; i < ARRAY_SIZE(user_key); i++)
319 key[i] = cpu_to_le32(user_key[i]);
320
321 tcp_fastopen_reset_cipher(net, NULL, key,
322 TCP_FASTOPEN_KEY_LENGTH);
323 }
324
325 bad_key:
326 pr_debug("proc FO key set 0x%x-%x-%x-%x <- 0x%s: %u\n",
327 user_key[0], user_key[1], user_key[2], user_key[3],
328 (char *)tbl.data, ret);
329 kfree(tbl.data);
330 return ret;
331 }
332
333 static void proc_configure_early_demux(int enabled, int protocol)
334 {
335 struct net_protocol *ipprot;
336 #if IS_ENABLED(CONFIG_IPV6)
337 struct inet6_protocol *ip6prot;
338 #endif
339
340 rcu_read_lock();
341
342 ipprot = rcu_dereference(inet_protos[protocol]);
343 if (ipprot)
344 ipprot->early_demux = enabled ? ipprot->early_demux_handler :
345 NULL;
346
347 #if IS_ENABLED(CONFIG_IPV6)
348 ip6prot = rcu_dereference(inet6_protos[protocol]);
349 if (ip6prot)
350 ip6prot->early_demux = enabled ? ip6prot->early_demux_handler :
351 NULL;
352 #endif
353 rcu_read_unlock();
354 }
355
356 static int proc_tcp_early_demux(struct ctl_table *table, int write,
357 void __user *buffer, size_t *lenp, loff_t *ppos)
358 {
359 int ret = 0;
360
361 ret = proc_dointvec(table, write, buffer, lenp, ppos);
362
363 if (write && !ret) {
364 int enabled = init_net.ipv4.sysctl_tcp_early_demux;
365
366 proc_configure_early_demux(enabled, IPPROTO_TCP);
367 }
368
369 return ret;
370 }
371
372 static int proc_udp_early_demux(struct ctl_table *table, int write,
373 void __user *buffer, size_t *lenp, loff_t *ppos)
374 {
375 int ret = 0;
376
377 ret = proc_dointvec(table, write, buffer, lenp, ppos);
378
379 if (write && !ret) {
380 int enabled = init_net.ipv4.sysctl_udp_early_demux;
381
382 proc_configure_early_demux(enabled, IPPROTO_UDP);
383 }
384
385 return ret;
386 }
387
388 static int proc_tfo_blackhole_detect_timeout(struct ctl_table *table,
389 int write,
390 void __user *buffer,
391 size_t *lenp, loff_t *ppos)
392 {
393 struct net *net = container_of(table->data, struct net,
394 ipv4.sysctl_tcp_fastopen_blackhole_timeout);
395 int ret;
396
397 ret = proc_dointvec_minmax(table, write, buffer, lenp, ppos);
398 if (write && ret == 0)
399 atomic_set(&net->ipv4.tfo_active_disable_times, 0);
400
401 return ret;
402 }
403
404 static int proc_tcp_available_ulp(struct ctl_table *ctl,
405 int write,
406 void __user *buffer, size_t *lenp,
407 loff_t *ppos)
408 {
409 struct ctl_table tbl = { .maxlen = TCP_ULP_BUF_MAX, };
410 int ret;
411
412 tbl.data = kmalloc(tbl.maxlen, GFP_USER);
413 if (!tbl.data)
414 return -ENOMEM;
415 tcp_get_available_ulp(tbl.data, TCP_ULP_BUF_MAX);
416 ret = proc_dostring(&tbl, write, buffer, lenp, ppos);
417 kfree(tbl.data);
418
419 return ret;
420 }
421
422 #ifdef CONFIG_IP_ROUTE_MULTIPATH
423 static int proc_fib_multipath_hash_policy(struct ctl_table *table, int write,
424 void __user *buffer, size_t *lenp,
425 loff_t *ppos)
426 {
427 struct net *net = container_of(table->data, struct net,
428 ipv4.sysctl_fib_multipath_hash_policy);
429 int ret;
430
431 ret = proc_dointvec_minmax(table, write, buffer, lenp, ppos);
432 if (write && ret == 0)
433 call_netevent_notifiers(NETEVENT_IPV4_MPATH_HASH_UPDATE, net);
434
435 return ret;
436 }
437 #endif
438
439 static struct ctl_table ipv4_table[] = {
440 {
441 .procname = "tcp_max_orphans",
442 .data = &sysctl_tcp_max_orphans,
443 .maxlen = sizeof(int),
444 .mode = 0644,
445 .proc_handler = proc_dointvec
446 },
447 {
448 .procname = "inet_peer_threshold",
449 .data = &inet_peer_threshold,
450 .maxlen = sizeof(int),
451 .mode = 0644,
452 .proc_handler = proc_dointvec
453 },
454 {
455 .procname = "inet_peer_minttl",
456 .data = &inet_peer_minttl,
457 .maxlen = sizeof(int),
458 .mode = 0644,
459 .proc_handler = proc_dointvec_jiffies,
460 },
461 {
462 .procname = "inet_peer_maxttl",
463 .data = &inet_peer_maxttl,
464 .maxlen = sizeof(int),
465 .mode = 0644,
466 .proc_handler = proc_dointvec_jiffies,
467 },
468 {
469 .procname = "tcp_mem",
470 .maxlen = sizeof(sysctl_tcp_mem),
471 .data = &sysctl_tcp_mem,
472 .mode = 0644,
473 .proc_handler = proc_doulongvec_minmax,
474 },
475 {
476 .procname = "tcp_low_latency",
477 .data = &sysctl_tcp_low_latency,
478 .maxlen = sizeof(int),
479 .mode = 0644,
480 .proc_handler = proc_dointvec
481 },
482 #ifdef CONFIG_NETLABEL
483 {
484 .procname = "cipso_cache_enable",
485 .data = &cipso_v4_cache_enabled,
486 .maxlen = sizeof(int),
487 .mode = 0644,
488 .proc_handler = proc_dointvec,
489 },
490 {
491 .procname = "cipso_cache_bucket_size",
492 .data = &cipso_v4_cache_bucketsize,
493 .maxlen = sizeof(int),
494 .mode = 0644,
495 .proc_handler = proc_dointvec,
496 },
497 {
498 .procname = "cipso_rbm_optfmt",
499 .data = &cipso_v4_rbm_optfmt,
500 .maxlen = sizeof(int),
501 .mode = 0644,
502 .proc_handler = proc_dointvec,
503 },
504 {
505 .procname = "cipso_rbm_strictvalid",
506 .data = &cipso_v4_rbm_strictvalid,
507 .maxlen = sizeof(int),
508 .mode = 0644,
509 .proc_handler = proc_dointvec,
510 },
511 #endif /* CONFIG_NETLABEL */
512 {
513 .procname = "tcp_available_congestion_control",
514 .maxlen = TCP_CA_BUF_MAX,
515 .mode = 0444,
516 .proc_handler = proc_tcp_available_congestion_control,
517 },
518 {
519 .procname = "tcp_allowed_congestion_control",
520 .maxlen = TCP_CA_BUF_MAX,
521 .mode = 0644,
522 .proc_handler = proc_allowed_congestion_control,
523 },
524 {
525 .procname = "tcp_available_ulp",
526 .maxlen = TCP_ULP_BUF_MAX,
527 .mode = 0444,
528 .proc_handler = proc_tcp_available_ulp,
529 },
530 {
531 .procname = "icmp_msgs_per_sec",
532 .data = &sysctl_icmp_msgs_per_sec,
533 .maxlen = sizeof(int),
534 .mode = 0644,
535 .proc_handler = proc_dointvec_minmax,
536 .extra1 = &zero,
537 },
538 {
539 .procname = "icmp_msgs_burst",
540 .data = &sysctl_icmp_msgs_burst,
541 .maxlen = sizeof(int),
542 .mode = 0644,
543 .proc_handler = proc_dointvec_minmax,
544 .extra1 = &zero,
545 },
546 {
547 .procname = "udp_mem",
548 .data = &sysctl_udp_mem,
549 .maxlen = sizeof(sysctl_udp_mem),
550 .mode = 0644,
551 .proc_handler = proc_doulongvec_minmax,
552 },
553 { }
554 };
555
556 static struct ctl_table ipv4_net_table[] = {
557 {
558 .procname = "icmp_echo_ignore_all",
559 .data = &init_net.ipv4.sysctl_icmp_echo_ignore_all,
560 .maxlen = sizeof(int),
561 .mode = 0644,
562 .proc_handler = proc_dointvec
563 },
564 {
565 .procname = "icmp_echo_ignore_broadcasts",
566 .data = &init_net.ipv4.sysctl_icmp_echo_ignore_broadcasts,
567 .maxlen = sizeof(int),
568 .mode = 0644,
569 .proc_handler = proc_dointvec
570 },
571 {
572 .procname = "icmp_ignore_bogus_error_responses",
573 .data = &init_net.ipv4.sysctl_icmp_ignore_bogus_error_responses,
574 .maxlen = sizeof(int),
575 .mode = 0644,
576 .proc_handler = proc_dointvec
577 },
578 {
579 .procname = "icmp_errors_use_inbound_ifaddr",
580 .data = &init_net.ipv4.sysctl_icmp_errors_use_inbound_ifaddr,
581 .maxlen = sizeof(int),
582 .mode = 0644,
583 .proc_handler = proc_dointvec
584 },
585 {
586 .procname = "icmp_ratelimit",
587 .data = &init_net.ipv4.sysctl_icmp_ratelimit,
588 .maxlen = sizeof(int),
589 .mode = 0644,
590 .proc_handler = proc_dointvec_ms_jiffies,
591 },
592 {
593 .procname = "icmp_ratemask",
594 .data = &init_net.ipv4.sysctl_icmp_ratemask,
595 .maxlen = sizeof(int),
596 .mode = 0644,
597 .proc_handler = proc_dointvec
598 },
599 {
600 .procname = "ping_group_range",
601 .data = &init_net.ipv4.ping_group_range.range,
602 .maxlen = sizeof(gid_t)*2,
603 .mode = 0644,
604 .proc_handler = ipv4_ping_group_range,
605 },
606 #ifdef CONFIG_NET_L3_MASTER_DEV
607 {
608 .procname = "raw_l3mdev_accept",
609 .data = &init_net.ipv4.sysctl_raw_l3mdev_accept,
610 .maxlen = sizeof(int),
611 .mode = 0644,
612 .proc_handler = proc_dointvec_minmax,
613 .extra1 = &zero,
614 .extra2 = &one,
615 },
616 #endif
617 {
618 .procname = "tcp_ecn",
619 .data = &init_net.ipv4.sysctl_tcp_ecn,
620 .maxlen = sizeof(int),
621 .mode = 0644,
622 .proc_handler = proc_dointvec
623 },
624 {
625 .procname = "tcp_ecn_fallback",
626 .data = &init_net.ipv4.sysctl_tcp_ecn_fallback,
627 .maxlen = sizeof(int),
628 .mode = 0644,
629 .proc_handler = proc_dointvec
630 },
631 {
632 .procname = "ip_dynaddr",
633 .data = &init_net.ipv4.sysctl_ip_dynaddr,
634 .maxlen = sizeof(int),
635 .mode = 0644,
636 .proc_handler = proc_dointvec
637 },
638 {
639 .procname = "ip_early_demux",
640 .data = &init_net.ipv4.sysctl_ip_early_demux,
641 .maxlen = sizeof(int),
642 .mode = 0644,
643 .proc_handler = proc_dointvec
644 },
645 {
646 .procname = "udp_early_demux",
647 .data = &init_net.ipv4.sysctl_udp_early_demux,
648 .maxlen = sizeof(int),
649 .mode = 0644,
650 .proc_handler = proc_udp_early_demux
651 },
652 {
653 .procname = "tcp_early_demux",
654 .data = &init_net.ipv4.sysctl_tcp_early_demux,
655 .maxlen = sizeof(int),
656 .mode = 0644,
657 .proc_handler = proc_tcp_early_demux
658 },
659 {
660 .procname = "ip_default_ttl",
661 .data = &init_net.ipv4.sysctl_ip_default_ttl,
662 .maxlen = sizeof(int),
663 .mode = 0644,
664 .proc_handler = proc_dointvec_minmax,
665 .extra1 = &ip_ttl_min,
666 .extra2 = &ip_ttl_max,
667 },
668 {
669 .procname = "ip_local_port_range",
670 .maxlen = sizeof(init_net.ipv4.ip_local_ports.range),
671 .data = &init_net.ipv4.ip_local_ports.range,
672 .mode = 0644,
673 .proc_handler = ipv4_local_port_range,
674 },
675 {
676 .procname = "ip_local_reserved_ports",
677 .data = &init_net.ipv4.sysctl_local_reserved_ports,
678 .maxlen = 65536,
679 .mode = 0644,
680 .proc_handler = proc_do_large_bitmap,
681 },
682 {
683 .procname = "ip_no_pmtu_disc",
684 .data = &init_net.ipv4.sysctl_ip_no_pmtu_disc,
685 .maxlen = sizeof(int),
686 .mode = 0644,
687 .proc_handler = proc_dointvec
688 },
689 {
690 .procname = "ip_forward_use_pmtu",
691 .data = &init_net.ipv4.sysctl_ip_fwd_use_pmtu,
692 .maxlen = sizeof(int),
693 .mode = 0644,
694 .proc_handler = proc_dointvec,
695 },
696 {
697 .procname = "ip_forward_update_priority",
698 .data = &init_net.ipv4.sysctl_ip_fwd_update_priority,
699 .maxlen = sizeof(int),
700 .mode = 0644,
701 .proc_handler = ipv4_fwd_update_priority,
702 .extra1 = &zero,
703 .extra2 = &one,
704 },
705 {
706 .procname = "ip_nonlocal_bind",
707 .data = &init_net.ipv4.sysctl_ip_nonlocal_bind,
708 .maxlen = sizeof(int),
709 .mode = 0644,
710 .proc_handler = proc_dointvec
711 },
712 {
713 .procname = "fwmark_reflect",
714 .data = &init_net.ipv4.sysctl_fwmark_reflect,
715 .maxlen = sizeof(int),
716 .mode = 0644,
717 .proc_handler = proc_dointvec,
718 },
719 {
720 .procname = "tcp_fwmark_accept",
721 .data = &init_net.ipv4.sysctl_tcp_fwmark_accept,
722 .maxlen = sizeof(int),
723 .mode = 0644,
724 .proc_handler = proc_dointvec,
725 },
726 #ifdef CONFIG_NET_L3_MASTER_DEV
727 {
728 .procname = "tcp_l3mdev_accept",
729 .data = &init_net.ipv4.sysctl_tcp_l3mdev_accept,
730 .maxlen = sizeof(int),
731 .mode = 0644,
732 .proc_handler = proc_dointvec_minmax,
733 .extra1 = &zero,
734 .extra2 = &one,
735 },
736 #endif
737 {
738 .procname = "tcp_mtu_probing",
739 .data = &init_net.ipv4.sysctl_tcp_mtu_probing,
740 .maxlen = sizeof(int),
741 .mode = 0644,
742 .proc_handler = proc_dointvec,
743 },
744 {
745 .procname = "tcp_base_mss",
746 .data = &init_net.ipv4.sysctl_tcp_base_mss,
747 .maxlen = sizeof(int),
748 .mode = 0644,
749 .proc_handler = proc_dointvec,
750 },
751 {
752 .procname = "tcp_probe_threshold",
753 .data = &init_net.ipv4.sysctl_tcp_probe_threshold,
754 .maxlen = sizeof(int),
755 .mode = 0644,
756 .proc_handler = proc_dointvec,
757 },
758 {
759 .procname = "tcp_probe_interval",
760 .data = &init_net.ipv4.sysctl_tcp_probe_interval,
761 .maxlen = sizeof(u32),
762 .mode = 0644,
763 .proc_handler = proc_douintvec_minmax,
764 .extra2 = &u32_max_div_HZ,
765 },
766 {
767 .procname = "igmp_link_local_mcast_reports",
768 .data = &init_net.ipv4.sysctl_igmp_llm_reports,
769 .maxlen = sizeof(int),
770 .mode = 0644,
771 .proc_handler = proc_dointvec
772 },
773 {
774 .procname = "igmp_max_memberships",
775 .data = &init_net.ipv4.sysctl_igmp_max_memberships,
776 .maxlen = sizeof(int),
777 .mode = 0644,
778 .proc_handler = proc_dointvec
779 },
780 {
781 .procname = "igmp_max_msf",
782 .data = &init_net.ipv4.sysctl_igmp_max_msf,
783 .maxlen = sizeof(int),
784 .mode = 0644,
785 .proc_handler = proc_dointvec
786 },
787 #ifdef CONFIG_IP_MULTICAST
788 {
789 .procname = "igmp_qrv",
790 .data = &init_net.ipv4.sysctl_igmp_qrv,
791 .maxlen = sizeof(int),
792 .mode = 0644,
793 .proc_handler = proc_dointvec_minmax,
794 .extra1 = &one
795 },
796 #endif
797 {
798 .procname = "tcp_congestion_control",
799 .data = &init_net.ipv4.tcp_congestion_control,
800 .mode = 0644,
801 .maxlen = TCP_CA_NAME_MAX,
802 .proc_handler = proc_tcp_congestion_control,
803 },
804 {
805 .procname = "tcp_keepalive_time",
806 .data = &init_net.ipv4.sysctl_tcp_keepalive_time,
807 .maxlen = sizeof(int),
808 .mode = 0644,
809 .proc_handler = proc_dointvec_jiffies,
810 },
811 {
812 .procname = "tcp_keepalive_probes",
813 .data = &init_net.ipv4.sysctl_tcp_keepalive_probes,
814 .maxlen = sizeof(int),
815 .mode = 0644,
816 .proc_handler = proc_dointvec
817 },
818 {
819 .procname = "tcp_keepalive_intvl",
820 .data = &init_net.ipv4.sysctl_tcp_keepalive_intvl,
821 .maxlen = sizeof(int),
822 .mode = 0644,
823 .proc_handler = proc_dointvec_jiffies,
824 },
825 {
826 .procname = "tcp_syn_retries",
827 .data = &init_net.ipv4.sysctl_tcp_syn_retries,
828 .maxlen = sizeof(int),
829 .mode = 0644,
830 .proc_handler = proc_dointvec_minmax,
831 .extra1 = &tcp_syn_retries_min,
832 .extra2 = &tcp_syn_retries_max
833 },
834 {
835 .procname = "tcp_synack_retries",
836 .data = &init_net.ipv4.sysctl_tcp_synack_retries,
837 .maxlen = sizeof(int),
838 .mode = 0644,
839 .proc_handler = proc_dointvec
840 },
841 #ifdef CONFIG_SYN_COOKIES
842 {
843 .procname = "tcp_syncookies",
844 .data = &init_net.ipv4.sysctl_tcp_syncookies,
845 .maxlen = sizeof(int),
846 .mode = 0644,
847 .proc_handler = proc_dointvec
848 },
849 #endif
850 {
851 .procname = "tcp_reordering",
852 .data = &init_net.ipv4.sysctl_tcp_reordering,
853 .maxlen = sizeof(int),
854 .mode = 0644,
855 .proc_handler = proc_dointvec
856 },
857 {
858 .procname = "tcp_retries1",
859 .data = &init_net.ipv4.sysctl_tcp_retries1,
860 .maxlen = sizeof(int),
861 .mode = 0644,
862 .proc_handler = proc_dointvec_minmax,
863 .extra2 = &tcp_retr1_max
864 },
865 {
866 .procname = "tcp_retries2",
867 .data = &init_net.ipv4.sysctl_tcp_retries2,
868 .maxlen = sizeof(int),
869 .mode = 0644,
870 .proc_handler = proc_dointvec
871 },
872 {
873 .procname = "tcp_orphan_retries",
874 .data = &init_net.ipv4.sysctl_tcp_orphan_retries,
875 .maxlen = sizeof(int),
876 .mode = 0644,
877 .proc_handler = proc_dointvec
878 },
879 {
880 .procname = "tcp_fin_timeout",
881 .data = &init_net.ipv4.sysctl_tcp_fin_timeout,
882 .maxlen = sizeof(int),
883 .mode = 0644,
884 .proc_handler = proc_dointvec_jiffies,
885 },
886 {
887 .procname = "tcp_notsent_lowat",
888 .data = &init_net.ipv4.sysctl_tcp_notsent_lowat,
889 .maxlen = sizeof(unsigned int),
890 .mode = 0644,
891 .proc_handler = proc_douintvec,
892 },
893 {
894 .procname = "tcp_tw_reuse",
895 .data = &init_net.ipv4.sysctl_tcp_tw_reuse,
896 .maxlen = sizeof(int),
897 .mode = 0644,
898 .proc_handler = proc_dointvec_minmax,
899 .extra1 = &zero,
900 .extra2 = &two,
901 },
902 {
903 .procname = "tcp_max_tw_buckets",
904 .data = &init_net.ipv4.tcp_death_row.sysctl_max_tw_buckets,
905 .maxlen = sizeof(int),
906 .mode = 0644,
907 .proc_handler = proc_dointvec
908 },
909 {
910 .procname = "tcp_max_syn_backlog",
911 .data = &init_net.ipv4.sysctl_max_syn_backlog,
912 .maxlen = sizeof(int),
913 .mode = 0644,
914 .proc_handler = proc_dointvec
915 },
916 {
917 .procname = "tcp_fastopen",
918 .data = &init_net.ipv4.sysctl_tcp_fastopen,
919 .maxlen = sizeof(int),
920 .mode = 0644,
921 .proc_handler = proc_dointvec,
922 },
923 {
924 .procname = "tcp_fastopen_key",
925 .mode = 0600,
926 .data = &init_net.ipv4.sysctl_tcp_fastopen,
927 .maxlen = ((TCP_FASTOPEN_KEY_LENGTH * 2) + 10),
928 .proc_handler = proc_tcp_fastopen_key,
929 },
930 {
931 .procname = "tcp_fastopen_blackhole_timeout_sec",
932 .data = &init_net.ipv4.sysctl_tcp_fastopen_blackhole_timeout,
933 .maxlen = sizeof(int),
934 .mode = 0644,
935 .proc_handler = proc_tfo_blackhole_detect_timeout,
936 .extra1 = &zero,
937 },
938 #ifdef CONFIG_IP_ROUTE_MULTIPATH
939 {
940 .procname = "fib_multipath_use_neigh",
941 .data = &init_net.ipv4.sysctl_fib_multipath_use_neigh,
942 .maxlen = sizeof(int),
943 .mode = 0644,
944 .proc_handler = proc_dointvec_minmax,
945 .extra1 = &zero,
946 .extra2 = &one,
947 },
948 {
949 .procname = "fib_multipath_hash_policy",
950 .data = &init_net.ipv4.sysctl_fib_multipath_hash_policy,
951 .maxlen = sizeof(int),
952 .mode = 0644,
953 .proc_handler = proc_fib_multipath_hash_policy,
954 .extra1 = &zero,
955 .extra2 = &one,
956 },
957 #endif
958 {
959 .procname = "ip_unprivileged_port_start",
960 .maxlen = sizeof(int),
961 .data = &init_net.ipv4.sysctl_ip_prot_sock,
962 .mode = 0644,
963 .proc_handler = ipv4_privileged_ports,
964 },
965 #ifdef CONFIG_NET_L3_MASTER_DEV
966 {
967 .procname = "udp_l3mdev_accept",
968 .data = &init_net.ipv4.sysctl_udp_l3mdev_accept,
969 .maxlen = sizeof(int),
970 .mode = 0644,
971 .proc_handler = proc_dointvec_minmax,
972 .extra1 = &zero,
973 .extra2 = &one,
974 },
975 #endif
976 {
977 .procname = "tcp_sack",
978 .data = &init_net.ipv4.sysctl_tcp_sack,
979 .maxlen = sizeof(int),
980 .mode = 0644,
981 .proc_handler = proc_dointvec
982 },
983 {
984 .procname = "tcp_window_scaling",
985 .data = &init_net.ipv4.sysctl_tcp_window_scaling,
986 .maxlen = sizeof(int),
987 .mode = 0644,
988 .proc_handler = proc_dointvec
989 },
990 {
991 .procname = "tcp_timestamps",
992 .data = &init_net.ipv4.sysctl_tcp_timestamps,
993 .maxlen = sizeof(int),
994 .mode = 0644,
995 .proc_handler = proc_dointvec
996 },
997 {
998 .procname = "tcp_early_retrans",
999 .data = &init_net.ipv4.sysctl_tcp_early_retrans,
1000 .maxlen = sizeof(int),
1001 .mode = 0644,
1002 .proc_handler = proc_dointvec_minmax,
1003 .extra1 = &zero,
1004 .extra2 = &four,
1005 },
1006 {
1007 .procname = "tcp_recovery",
1008 .data = &init_net.ipv4.sysctl_tcp_recovery,
1009 .maxlen = sizeof(int),
1010 .mode = 0644,
1011 .proc_handler = proc_dointvec,
1012 },
1013 {
1014 .procname = "tcp_thin_linear_timeouts",
1015 .data = &init_net.ipv4.sysctl_tcp_thin_linear_timeouts,
1016 .maxlen = sizeof(int),
1017 .mode = 0644,
1018 .proc_handler = proc_dointvec
1019 },
1020 {
1021 .procname = "tcp_slow_start_after_idle",
1022 .data = &init_net.ipv4.sysctl_tcp_slow_start_after_idle,
1023 .maxlen = sizeof(int),
1024 .mode = 0644,
1025 .proc_handler = proc_dointvec
1026 },
1027 {
1028 .procname = "tcp_retrans_collapse",
1029 .data = &init_net.ipv4.sysctl_tcp_retrans_collapse,
1030 .maxlen = sizeof(int),
1031 .mode = 0644,
1032 .proc_handler = proc_dointvec
1033 },
1034 {
1035 .procname = "tcp_stdurg",
1036 .data = &init_net.ipv4.sysctl_tcp_stdurg,
1037 .maxlen = sizeof(int),
1038 .mode = 0644,
1039 .proc_handler = proc_dointvec
1040 },
1041 {
1042 .procname = "tcp_rfc1337",
1043 .data = &init_net.ipv4.sysctl_tcp_rfc1337,
1044 .maxlen = sizeof(int),
1045 .mode = 0644,
1046 .proc_handler = proc_dointvec
1047 },
1048 {
1049 .procname = "tcp_abort_on_overflow",
1050 .data = &init_net.ipv4.sysctl_tcp_abort_on_overflow,
1051 .maxlen = sizeof(int),
1052 .mode = 0644,
1053 .proc_handler = proc_dointvec
1054 },
1055 {
1056 .procname = "tcp_fack",
1057 .data = &init_net.ipv4.sysctl_tcp_fack,
1058 .maxlen = sizeof(int),
1059 .mode = 0644,
1060 .proc_handler = proc_dointvec
1061 },
1062 {
1063 .procname = "tcp_max_reordering",
1064 .data = &init_net.ipv4.sysctl_tcp_max_reordering,
1065 .maxlen = sizeof(int),
1066 .mode = 0644,
1067 .proc_handler = proc_dointvec
1068 },
1069 {
1070 .procname = "tcp_dsack",
1071 .data = &init_net.ipv4.sysctl_tcp_dsack,
1072 .maxlen = sizeof(int),
1073 .mode = 0644,
1074 .proc_handler = proc_dointvec
1075 },
1076 {
1077 .procname = "tcp_app_win",
1078 .data = &init_net.ipv4.sysctl_tcp_app_win,
1079 .maxlen = sizeof(int),
1080 .mode = 0644,
1081 .proc_handler = proc_dointvec
1082 },
1083 {
1084 .procname = "tcp_adv_win_scale",
1085 .data = &init_net.ipv4.sysctl_tcp_adv_win_scale,
1086 .maxlen = sizeof(int),
1087 .mode = 0644,
1088 .proc_handler = proc_dointvec_minmax,
1089 .extra1 = &tcp_adv_win_scale_min,
1090 .extra2 = &tcp_adv_win_scale_max,
1091 },
1092 {
1093 .procname = "tcp_frto",
1094 .data = &init_net.ipv4.sysctl_tcp_frto,
1095 .maxlen = sizeof(int),
1096 .mode = 0644,
1097 .proc_handler = proc_dointvec
1098 },
1099 {
1100 .procname = "tcp_no_metrics_save",
1101 .data = &init_net.ipv4.sysctl_tcp_nometrics_save,
1102 .maxlen = sizeof(int),
1103 .mode = 0644,
1104 .proc_handler = proc_dointvec,
1105 },
1106 {
1107 .procname = "tcp_moderate_rcvbuf",
1108 .data = &init_net.ipv4.sysctl_tcp_moderate_rcvbuf,
1109 .maxlen = sizeof(int),
1110 .mode = 0644,
1111 .proc_handler = proc_dointvec,
1112 },
1113 {
1114 .procname = "tcp_tso_win_divisor",
1115 .data = &init_net.ipv4.sysctl_tcp_tso_win_divisor,
1116 .maxlen = sizeof(int),
1117 .mode = 0644,
1118 .proc_handler = proc_dointvec,
1119 },
1120 {
1121 .procname = "tcp_workaround_signed_windows",
1122 .data = &init_net.ipv4.sysctl_tcp_workaround_signed_windows,
1123 .maxlen = sizeof(int),
1124 .mode = 0644,
1125 .proc_handler = proc_dointvec
1126 },
1127 {
1128 .procname = "tcp_limit_output_bytes",
1129 .data = &init_net.ipv4.sysctl_tcp_limit_output_bytes,
1130 .maxlen = sizeof(int),
1131 .mode = 0644,
1132 .proc_handler = proc_dointvec
1133 },
1134 {
1135 .procname = "tcp_challenge_ack_limit",
1136 .data = &init_net.ipv4.sysctl_tcp_challenge_ack_limit,
1137 .maxlen = sizeof(int),
1138 .mode = 0644,
1139 .proc_handler = proc_dointvec
1140 },
1141 {
1142 .procname = "tcp_min_tso_segs",
1143 .data = &init_net.ipv4.sysctl_tcp_min_tso_segs,
1144 .maxlen = sizeof(int),
1145 .mode = 0644,
1146 .proc_handler = proc_dointvec_minmax,
1147 .extra1 = &one,
1148 .extra2 = &gso_max_segs,
1149 },
1150 {
1151 .procname = "tcp_min_rtt_wlen",
1152 .data = &init_net.ipv4.sysctl_tcp_min_rtt_wlen,
1153 .maxlen = sizeof(int),
1154 .mode = 0644,
1155 .proc_handler = proc_dointvec_minmax,
1156 .extra1 = &zero,
1157 .extra2 = &one_day_secs
1158 },
1159 {
1160 .procname = "tcp_autocorking",
1161 .data = &init_net.ipv4.sysctl_tcp_autocorking,
1162 .maxlen = sizeof(int),
1163 .mode = 0644,
1164 .proc_handler = proc_dointvec_minmax,
1165 .extra1 = &zero,
1166 .extra2 = &one,
1167 },
1168 {
1169 .procname = "tcp_invalid_ratelimit",
1170 .data = &init_net.ipv4.sysctl_tcp_invalid_ratelimit,
1171 .maxlen = sizeof(int),
1172 .mode = 0644,
1173 .proc_handler = proc_dointvec_ms_jiffies,
1174 },
1175 {
1176 .procname = "tcp_pacing_ss_ratio",
1177 .data = &init_net.ipv4.sysctl_tcp_pacing_ss_ratio,
1178 .maxlen = sizeof(int),
1179 .mode = 0644,
1180 .proc_handler = proc_dointvec_minmax,
1181 .extra1 = &zero,
1182 .extra2 = &thousand,
1183 },
1184 {
1185 .procname = "tcp_pacing_ca_ratio",
1186 .data = &init_net.ipv4.sysctl_tcp_pacing_ca_ratio,
1187 .maxlen = sizeof(int),
1188 .mode = 0644,
1189 .proc_handler = proc_dointvec_minmax,
1190 .extra1 = &zero,
1191 .extra2 = &thousand,
1192 },
1193 {
1194 .procname = "tcp_wmem",
1195 .data = &init_net.ipv4.sysctl_tcp_wmem,
1196 .maxlen = sizeof(init_net.ipv4.sysctl_tcp_wmem),
1197 .mode = 0644,
1198 .proc_handler = proc_dointvec_minmax,
1199 .extra1 = &one,
1200 },
1201 {
1202 .procname = "tcp_rmem",
1203 .data = &init_net.ipv4.sysctl_tcp_rmem,
1204 .maxlen = sizeof(init_net.ipv4.sysctl_tcp_rmem),
1205 .mode = 0644,
1206 .proc_handler = proc_dointvec_minmax,
1207 .extra1 = &one,
1208 },
1209 {
1210 .procname = "tcp_comp_sack_delay_ns",
1211 .data = &init_net.ipv4.sysctl_tcp_comp_sack_delay_ns,
1212 .maxlen = sizeof(unsigned long),
1213 .mode = 0644,
1214 .proc_handler = proc_doulongvec_minmax,
1215 },
1216 {
1217 .procname = "tcp_comp_sack_nr",
1218 .data = &init_net.ipv4.sysctl_tcp_comp_sack_nr,
1219 .maxlen = sizeof(int),
1220 .mode = 0644,
1221 .proc_handler = proc_dointvec_minmax,
1222 .extra1 = &zero,
1223 .extra2 = &comp_sack_nr_max,
1224 },
1225 {
1226 .procname = "udp_rmem_min",
1227 .data = &init_net.ipv4.sysctl_udp_rmem_min,
1228 .maxlen = sizeof(init_net.ipv4.sysctl_udp_rmem_min),
1229 .mode = 0644,
1230 .proc_handler = proc_dointvec_minmax,
1231 .extra1 = &one
1232 },
1233 {
1234 .procname = "udp_wmem_min",
1235 .data = &init_net.ipv4.sysctl_udp_wmem_min,
1236 .maxlen = sizeof(init_net.ipv4.sysctl_udp_wmem_min),
1237 .mode = 0644,
1238 .proc_handler = proc_dointvec_minmax,
1239 .extra1 = &one
1240 },
1241 { }
1242 };
1243
1244 static __net_init int ipv4_sysctl_init_net(struct net *net)
1245 {
1246 struct ctl_table *table;
1247
1248 table = ipv4_net_table;
1249 if (!net_eq(net, &init_net)) {
1250 int i;
1251
1252 table = kmemdup(table, sizeof(ipv4_net_table), GFP_KERNEL);
1253 if (!table)
1254 goto err_alloc;
1255
1256 /* Update the variables to point into the current struct net */
1257 for (i = 0; i < ARRAY_SIZE(ipv4_net_table) - 1; i++)
1258 table[i].data += (void *)net - (void *)&init_net;
1259 }
1260
1261 net->ipv4.ipv4_hdr = register_net_sysctl(net, "net/ipv4", table);
1262 if (!net->ipv4.ipv4_hdr)
1263 goto err_reg;
1264
1265 net->ipv4.sysctl_local_reserved_ports = kzalloc(65536 / 8, GFP_KERNEL);
1266 if (!net->ipv4.sysctl_local_reserved_ports)
1267 goto err_ports;
1268
1269 return 0;
1270
1271 err_ports:
1272 unregister_net_sysctl_table(net->ipv4.ipv4_hdr);
1273 err_reg:
1274 if (!net_eq(net, &init_net))
1275 kfree(table);
1276 err_alloc:
1277 return -ENOMEM;
1278 }
1279
1280 static __net_exit void ipv4_sysctl_exit_net(struct net *net)
1281 {
1282 struct ctl_table *table;
1283
1284 kfree(net->ipv4.sysctl_local_reserved_ports);
1285 table = net->ipv4.ipv4_hdr->ctl_table_arg;
1286 unregister_net_sysctl_table(net->ipv4.ipv4_hdr);
1287 kfree(table);
1288 }
1289
1290 static __net_initdata struct pernet_operations ipv4_sysctl_ops = {
1291 .init = ipv4_sysctl_init_net,
1292 .exit = ipv4_sysctl_exit_net,
1293 };
1294
1295 static __init int sysctl_ipv4_init(void)
1296 {
1297 struct ctl_table_header *hdr;
1298
1299 hdr = register_net_sysctl(&init_net, "net/ipv4", ipv4_table);
1300 if (!hdr)
1301 return -ENOMEM;
1302
1303 if (register_pernet_subsys(&ipv4_sysctl_ops)) {
1304 unregister_net_sysctl_table(hdr);
1305 return -ENOMEM;
1306 }
1307
1308 return 0;
1309 }
1310
1311 __initcall(sysctl_ipv4_init);
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