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rxrpc: Show some more information through /proc files
[linux/fpc-iii.git] / net / ipv4 / sysctl_net_ipv4.c
blob5fa335fd385254def583b9a5100fbe7b9ce94cd6
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
52 /* obsolete */
53 static int sysctl_tcp_low_latency __read_mostly;
54
55 /* Update system visible IP port range */
56 static void set_local_port_range(struct net *net, int range[2])
57 {
58 bool same_parity = !((range[0] ^ range[1]) & 1);
59
60 write_seqlock_bh(&net->ipv4.ip_local_ports.lock);
61 if (same_parity && !net->ipv4.ip_local_ports.warned) {
62 net->ipv4.ip_local_ports.warned = true;
63 pr_err_ratelimited("ip_local_port_range: prefer different parity for start/end values.\n");
64 }
65 net->ipv4.ip_local_ports.range[0] = range[0];
66 net->ipv4.ip_local_ports.range[1] = range[1];
67 write_sequnlock_bh(&net->ipv4.ip_local_ports.lock);
68 }
69
70 /* Validate changes from /proc interface. */
71 static int ipv4_local_port_range(struct ctl_table *table, int write,
72 void __user *buffer,
73 size_t *lenp, loff_t *ppos)
74 {
75 struct net *net =
76 container_of(table->data, struct net, ipv4.ip_local_ports.range);
77 int ret;
78 int range[2];
79 struct ctl_table tmp = {
80 .data = &range,
81 .maxlen = sizeof(range),
82 .mode = table->mode,
83 .extra1 = &ip_local_port_range_min,
84 .extra2 = &ip_local_port_range_max,
85 };
86
87 inet_get_local_port_range(net, &range[0], &range[1]);
88
89 ret = proc_dointvec_minmax(&tmp, write, buffer, lenp, ppos);
90
91 if (write && ret == 0) {
92 /* Ensure that the upper limit is not smaller than the lower,
93 * and that the lower does not encroach upon the privileged
94 * port limit.
95 */
96 if ((range[1] < range[0]) ||
97 (range[0] < net->ipv4.sysctl_ip_prot_sock))
98 ret = -EINVAL;
99 else
100 set_local_port_range(net, range);
101 }
102
103 return ret;
104 }
105
106 /* Validate changes from /proc interface. */
107 static int ipv4_privileged_ports(struct ctl_table *table, int write,
108 void __user *buffer, size_t *lenp, loff_t *ppos)
109 {
110 struct net *net = container_of(table->data, struct net,
111 ipv4.sysctl_ip_prot_sock);
112 int ret;
113 int pports;
114 int range[2];
115 struct ctl_table tmp = {
116 .data = &pports,
117 .maxlen = sizeof(pports),
118 .mode = table->mode,
119 .extra1 = &ip_privileged_port_min,
120 .extra2 = &ip_privileged_port_max,
121 };
122
123 pports = net->ipv4.sysctl_ip_prot_sock;
124
125 ret = proc_dointvec_minmax(&tmp, write, buffer, lenp, ppos);
126
127 if (write && ret == 0) {
128 inet_get_local_port_range(net, &range[0], &range[1]);
129 /* Ensure that the local port range doesn't overlap with the
130 * privileged port range.
131 */
132 if (range[0] < pports)
133 ret = -EINVAL;
134 else
135 net->ipv4.sysctl_ip_prot_sock = pports;
136 }
137
138 return ret;
139 }
140
141 static void inet_get_ping_group_range_table(struct ctl_table *table, kgid_t *low, kgid_t *high)
142 {
143 kgid_t *data = table->data;
144 struct net *net =
145 container_of(table->data, struct net, ipv4.ping_group_range.range);
146 unsigned int seq;
147 do {
148 seq = read_seqbegin(&net->ipv4.ping_group_range.lock);
149
150 *low = data[0];
151 *high = data[1];
152 } while (read_seqretry(&net->ipv4.ping_group_range.lock, seq));
153 }
154
155 /* Update system visible IP port range */
156 static void set_ping_group_range(struct ctl_table *table, kgid_t low, kgid_t high)
157 {
158 kgid_t *data = table->data;
159 struct net *net =
160 container_of(table->data, struct net, ipv4.ping_group_range.range);
161 write_seqlock(&net->ipv4.ping_group_range.lock);
162 data[0] = low;
163 data[1] = high;
164 write_sequnlock(&net->ipv4.ping_group_range.lock);
165 }
166
167 /* Validate changes from /proc interface. */
168 static int ipv4_ping_group_range(struct ctl_table *table, int write,
169 void __user *buffer,
170 size_t *lenp, loff_t *ppos)
171 {
172 struct user_namespace *user_ns = current_user_ns();
173 int ret;
174 gid_t urange[2];
175 kgid_t low, high;
176 struct ctl_table tmp = {
177 .data = &urange,
178 .maxlen = sizeof(urange),
179 .mode = table->mode,
180 .extra1 = &ip_ping_group_range_min,
181 .extra2 = &ip_ping_group_range_max,
182 };
183
184 inet_get_ping_group_range_table(table, &low, &high);
185 urange[0] = from_kgid_munged(user_ns, low);
186 urange[1] = from_kgid_munged(user_ns, high);
187 ret = proc_dointvec_minmax(&tmp, write, buffer, lenp, ppos);
188
189 if (write && ret == 0) {
190 low = make_kgid(user_ns, urange[0]);
191 high = make_kgid(user_ns, urange[1]);
192 if (!gid_valid(low) || !gid_valid(high))
193 return -EINVAL;
194 if (urange[1] < urange[0] || gid_lt(high, low)) {
195 low = make_kgid(&init_user_ns, 1);
196 high = make_kgid(&init_user_ns, 0);
197 }
198 set_ping_group_range(table, low, high);
199 }
200
201 return ret;
202 }
203
204 static int proc_tcp_congestion_control(struct ctl_table *ctl, int write,
205 void __user *buffer, size_t *lenp, loff_t *ppos)
206 {
207 struct net *net = container_of(ctl->data, struct net,
208 ipv4.tcp_congestion_control);
209 char val[TCP_CA_NAME_MAX];
210 struct ctl_table tbl = {
211 .data = val,
212 .maxlen = TCP_CA_NAME_MAX,
213 };
214 int ret;
215
216 tcp_get_default_congestion_control(net, val);
217
218 ret = proc_dostring(&tbl, write, buffer, lenp, ppos);
219 if (write && ret == 0)
220 ret = tcp_set_default_congestion_control(net, val);
221 return ret;
222 }
223
224 static int proc_tcp_available_congestion_control(struct ctl_table *ctl,
225 int write,
226 void __user *buffer, size_t *lenp,
227 loff_t *ppos)
228 {
229 struct ctl_table tbl = { .maxlen = TCP_CA_BUF_MAX, };
230 int ret;
231
232 tbl.data = kmalloc(tbl.maxlen, GFP_USER);
233 if (!tbl.data)
234 return -ENOMEM;
235 tcp_get_available_congestion_control(tbl.data, TCP_CA_BUF_MAX);
236 ret = proc_dostring(&tbl, write, buffer, lenp, ppos);
237 kfree(tbl.data);
238 return ret;
239 }
240
241 static int proc_allowed_congestion_control(struct ctl_table *ctl,
242 int write,
243 void __user *buffer, size_t *lenp,
244 loff_t *ppos)
245 {
246 struct ctl_table tbl = { .maxlen = TCP_CA_BUF_MAX };
247 int ret;
248
249 tbl.data = kmalloc(tbl.maxlen, GFP_USER);
250 if (!tbl.data)
251 return -ENOMEM;
252
253 tcp_get_allowed_congestion_control(tbl.data, tbl.maxlen);
254 ret = proc_dostring(&tbl, write, buffer, lenp, ppos);
255 if (write && ret == 0)
256 ret = tcp_set_allowed_congestion_control(tbl.data);
257 kfree(tbl.data);
258 return ret;
259 }
260
261 static int proc_tcp_fastopen_key(struct ctl_table *table, int write,
262 void __user *buffer, size_t *lenp,
263 loff_t *ppos)
264 {
265 struct net *net = container_of(table->data, struct net,
266 ipv4.sysctl_tcp_fastopen);
267 struct ctl_table tbl = { .maxlen = (TCP_FASTOPEN_KEY_LENGTH * 2 + 10) };
268 struct tcp_fastopen_context *ctxt;
269 u32 user_key[4]; /* 16 bytes, matching TCP_FASTOPEN_KEY_LENGTH */
270 __le32 key[4];
271 int ret, i;
272
273 tbl.data = kmalloc(tbl.maxlen, GFP_KERNEL);
274 if (!tbl.data)
275 return -ENOMEM;
276
277 rcu_read_lock();
278 ctxt = rcu_dereference(net->ipv4.tcp_fastopen_ctx);
279 if (ctxt)
280 memcpy(key, ctxt->key, TCP_FASTOPEN_KEY_LENGTH);
281 else
282 memset(key, 0, sizeof(key));
283 rcu_read_unlock();
284
285 for (i = 0; i < ARRAY_SIZE(key); i++)
286 user_key[i] = le32_to_cpu(key[i]);
287
288 snprintf(tbl.data, tbl.maxlen, "%08x-%08x-%08x-%08x",
289 user_key[0], user_key[1], user_key[2], user_key[3]);
290 ret = proc_dostring(&tbl, write, buffer, lenp, ppos);
291
292 if (write && ret == 0) {
293 if (sscanf(tbl.data, "%x-%x-%x-%x", user_key, user_key + 1,
294 user_key + 2, user_key + 3) != 4) {
295 ret = -EINVAL;
296 goto bad_key;
297 }
298
299 for (i = 0; i < ARRAY_SIZE(user_key); i++)
300 key[i] = cpu_to_le32(user_key[i]);
301
302 tcp_fastopen_reset_cipher(net, NULL, key,
303 TCP_FASTOPEN_KEY_LENGTH);
304 }
305
306 bad_key:
307 pr_debug("proc FO key set 0x%x-%x-%x-%x <- 0x%s: %u\n",
308 user_key[0], user_key[1], user_key[2], user_key[3],
309 (char *)tbl.data, ret);
310 kfree(tbl.data);
311 return ret;
312 }
313
314 static void proc_configure_early_demux(int enabled, int protocol)
315 {
316 struct net_protocol *ipprot;
317 #if IS_ENABLED(CONFIG_IPV6)
318 struct inet6_protocol *ip6prot;
319 #endif
320
321 rcu_read_lock();
322
323 ipprot = rcu_dereference(inet_protos[protocol]);
324 if (ipprot)
325 ipprot->early_demux = enabled ? ipprot->early_demux_handler :
326 NULL;
327
328 #if IS_ENABLED(CONFIG_IPV6)
329 ip6prot = rcu_dereference(inet6_protos[protocol]);
330 if (ip6prot)
331 ip6prot->early_demux = enabled ? ip6prot->early_demux_handler :
332 NULL;
333 #endif
334 rcu_read_unlock();
335 }
336
337 static int proc_tcp_early_demux(struct ctl_table *table, int write,
338 void __user *buffer, size_t *lenp, loff_t *ppos)
339 {
340 int ret = 0;
341
342 ret = proc_dointvec(table, write, buffer, lenp, ppos);
343
344 if (write && !ret) {
345 int enabled = init_net.ipv4.sysctl_tcp_early_demux;
346
347 proc_configure_early_demux(enabled, IPPROTO_TCP);
348 }
349
350 return ret;
351 }
352
353 static int proc_udp_early_demux(struct ctl_table *table, int write,
354 void __user *buffer, size_t *lenp, loff_t *ppos)
355 {
356 int ret = 0;
357
358 ret = proc_dointvec(table, write, buffer, lenp, ppos);
359
360 if (write && !ret) {
361 int enabled = init_net.ipv4.sysctl_udp_early_demux;
362
363 proc_configure_early_demux(enabled, IPPROTO_UDP);
364 }
365
366 return ret;
367 }
368
369 static int proc_tfo_blackhole_detect_timeout(struct ctl_table *table,
370 int write,
371 void __user *buffer,
372 size_t *lenp, loff_t *ppos)
373 {
374 struct net *net = container_of(table->data, struct net,
375 ipv4.sysctl_tcp_fastopen_blackhole_timeout);
376 int ret;
377
378 ret = proc_dointvec_minmax(table, write, buffer, lenp, ppos);
379 if (write && ret == 0)
380 atomic_set(&net->ipv4.tfo_active_disable_times, 0);
381
382 return ret;
383 }
384
385 static int proc_tcp_available_ulp(struct ctl_table *ctl,
386 int write,
387 void __user *buffer, size_t *lenp,
388 loff_t *ppos)
389 {
390 struct ctl_table tbl = { .maxlen = TCP_ULP_BUF_MAX, };
391 int ret;
392
393 tbl.data = kmalloc(tbl.maxlen, GFP_USER);
394 if (!tbl.data)
395 return -ENOMEM;
396 tcp_get_available_ulp(tbl.data, TCP_ULP_BUF_MAX);
397 ret = proc_dostring(&tbl, write, buffer, lenp, ppos);
398 kfree(tbl.data);
399
400 return ret;
401 }
402
403 #ifdef CONFIG_IP_ROUTE_MULTIPATH
404 static int proc_fib_multipath_hash_policy(struct ctl_table *table, int write,
405 void __user *buffer, size_t *lenp,
406 loff_t *ppos)
407 {
408 struct net *net = container_of(table->data, struct net,
409 ipv4.sysctl_fib_multipath_hash_policy);
410 int ret;
411
412 ret = proc_dointvec_minmax(table, write, buffer, lenp, ppos);
413 if (write && ret == 0)
414 call_netevent_notifiers(NETEVENT_IPV4_MPATH_HASH_UPDATE, net);
415
416 return ret;
417 }
418 #endif
419
420 static struct ctl_table ipv4_table[] = {
421 {
422 .procname = "tcp_max_orphans",
423 .data = &sysctl_tcp_max_orphans,
424 .maxlen = sizeof(int),
425 .mode = 0644,
426 .proc_handler = proc_dointvec
427 },
428 {
429 .procname = "inet_peer_threshold",
430 .data = &inet_peer_threshold,
431 .maxlen = sizeof(int),
432 .mode = 0644,
433 .proc_handler = proc_dointvec
434 },
435 {
436 .procname = "inet_peer_minttl",
437 .data = &inet_peer_minttl,
438 .maxlen = sizeof(int),
439 .mode = 0644,
440 .proc_handler = proc_dointvec_jiffies,
441 },
442 {
443 .procname = "inet_peer_maxttl",
444 .data = &inet_peer_maxttl,
445 .maxlen = sizeof(int),
446 .mode = 0644,
447 .proc_handler = proc_dointvec_jiffies,
448 },
449 {
450 .procname = "tcp_mem",
451 .maxlen = sizeof(sysctl_tcp_mem),
452 .data = &sysctl_tcp_mem,
453 .mode = 0644,
454 .proc_handler = proc_doulongvec_minmax,
455 },
456 {
457 .procname = "tcp_low_latency",
458 .data = &sysctl_tcp_low_latency,
459 .maxlen = sizeof(int),
460 .mode = 0644,
461 .proc_handler = proc_dointvec
462 },
463 #ifdef CONFIG_NETLABEL
464 {
465 .procname = "cipso_cache_enable",
466 .data = &cipso_v4_cache_enabled,
467 .maxlen = sizeof(int),
468 .mode = 0644,
469 .proc_handler = proc_dointvec,
470 },
471 {
472 .procname = "cipso_cache_bucket_size",
473 .data = &cipso_v4_cache_bucketsize,
474 .maxlen = sizeof(int),
475 .mode = 0644,
476 .proc_handler = proc_dointvec,
477 },
478 {
479 .procname = "cipso_rbm_optfmt",
480 .data = &cipso_v4_rbm_optfmt,
481 .maxlen = sizeof(int),
482 .mode = 0644,
483 .proc_handler = proc_dointvec,
484 },
485 {
486 .procname = "cipso_rbm_strictvalid",
487 .data = &cipso_v4_rbm_strictvalid,
488 .maxlen = sizeof(int),
489 .mode = 0644,
490 .proc_handler = proc_dointvec,
491 },
492 #endif /* CONFIG_NETLABEL */
493 {
494 .procname = "tcp_available_congestion_control",
495 .maxlen = TCP_CA_BUF_MAX,
496 .mode = 0444,
497 .proc_handler = proc_tcp_available_congestion_control,
498 },
499 {
500 .procname = "tcp_allowed_congestion_control",
501 .maxlen = TCP_CA_BUF_MAX,
502 .mode = 0644,
503 .proc_handler = proc_allowed_congestion_control,
504 },
505 {
506 .procname = "tcp_available_ulp",
507 .maxlen = TCP_ULP_BUF_MAX,
508 .mode = 0444,
509 .proc_handler = proc_tcp_available_ulp,
510 },
511 {
512 .procname = "icmp_msgs_per_sec",
513 .data = &sysctl_icmp_msgs_per_sec,
514 .maxlen = sizeof(int),
515 .mode = 0644,
516 .proc_handler = proc_dointvec_minmax,
517 .extra1 = &zero,
518 },
519 {
520 .procname = "icmp_msgs_burst",
521 .data = &sysctl_icmp_msgs_burst,
522 .maxlen = sizeof(int),
523 .mode = 0644,
524 .proc_handler = proc_dointvec_minmax,
525 .extra1 = &zero,
526 },
527 {
528 .procname = "udp_mem",
529 .data = &sysctl_udp_mem,
530 .maxlen = sizeof(sysctl_udp_mem),
531 .mode = 0644,
532 .proc_handler = proc_doulongvec_minmax,
533 },
534 { }
535 };
536
537 static struct ctl_table ipv4_net_table[] = {
538 {
539 .procname = "icmp_echo_ignore_all",
540 .data = &init_net.ipv4.sysctl_icmp_echo_ignore_all,
541 .maxlen = sizeof(int),
542 .mode = 0644,
543 .proc_handler = proc_dointvec
544 },
545 {
546 .procname = "icmp_echo_ignore_broadcasts",
547 .data = &init_net.ipv4.sysctl_icmp_echo_ignore_broadcasts,
548 .maxlen = sizeof(int),
549 .mode = 0644,
550 .proc_handler = proc_dointvec
551 },
552 {
553 .procname = "icmp_ignore_bogus_error_responses",
554 .data = &init_net.ipv4.sysctl_icmp_ignore_bogus_error_responses,
555 .maxlen = sizeof(int),
556 .mode = 0644,
557 .proc_handler = proc_dointvec
558 },
559 {
560 .procname = "icmp_errors_use_inbound_ifaddr",
561 .data = &init_net.ipv4.sysctl_icmp_errors_use_inbound_ifaddr,
562 .maxlen = sizeof(int),
563 .mode = 0644,
564 .proc_handler = proc_dointvec
565 },
566 {
567 .procname = "icmp_ratelimit",
568 .data = &init_net.ipv4.sysctl_icmp_ratelimit,
569 .maxlen = sizeof(int),
570 .mode = 0644,
571 .proc_handler = proc_dointvec_ms_jiffies,
572 },
573 {
574 .procname = "icmp_ratemask",
575 .data = &init_net.ipv4.sysctl_icmp_ratemask,
576 .maxlen = sizeof(int),
577 .mode = 0644,
578 .proc_handler = proc_dointvec
579 },
580 {
581 .procname = "ping_group_range",
582 .data = &init_net.ipv4.ping_group_range.range,
583 .maxlen = sizeof(gid_t)*2,
584 .mode = 0644,
585 .proc_handler = ipv4_ping_group_range,
586 },
587 {
588 .procname = "tcp_ecn",
589 .data = &init_net.ipv4.sysctl_tcp_ecn,
590 .maxlen = sizeof(int),
591 .mode = 0644,
592 .proc_handler = proc_dointvec
593 },
594 {
595 .procname = "tcp_ecn_fallback",
596 .data = &init_net.ipv4.sysctl_tcp_ecn_fallback,
597 .maxlen = sizeof(int),
598 .mode = 0644,
599 .proc_handler = proc_dointvec
600 },
601 {
602 .procname = "ip_dynaddr",
603 .data = &init_net.ipv4.sysctl_ip_dynaddr,
604 .maxlen = sizeof(int),
605 .mode = 0644,
606 .proc_handler = proc_dointvec
607 },
608 {
609 .procname = "ip_early_demux",
610 .data = &init_net.ipv4.sysctl_ip_early_demux,
611 .maxlen = sizeof(int),
612 .mode = 0644,
613 .proc_handler = proc_dointvec
614 },
615 {
616 .procname = "udp_early_demux",
617 .data = &init_net.ipv4.sysctl_udp_early_demux,
618 .maxlen = sizeof(int),
619 .mode = 0644,
620 .proc_handler = proc_udp_early_demux
621 },
622 {
623 .procname = "tcp_early_demux",
624 .data = &init_net.ipv4.sysctl_tcp_early_demux,
625 .maxlen = sizeof(int),
626 .mode = 0644,
627 .proc_handler = proc_tcp_early_demux
628 },
629 {
630 .procname = "ip_default_ttl",
631 .data = &init_net.ipv4.sysctl_ip_default_ttl,
632 .maxlen = sizeof(int),
633 .mode = 0644,
634 .proc_handler = proc_dointvec_minmax,
635 .extra1 = &ip_ttl_min,
636 .extra2 = &ip_ttl_max,
637 },
638 {
639 .procname = "ip_local_port_range",
640 .maxlen = sizeof(init_net.ipv4.ip_local_ports.range),
641 .data = &init_net.ipv4.ip_local_ports.range,
642 .mode = 0644,
643 .proc_handler = ipv4_local_port_range,
644 },
645 {
646 .procname = "ip_local_reserved_ports",
647 .data = &init_net.ipv4.sysctl_local_reserved_ports,
648 .maxlen = 65536,
649 .mode = 0644,
650 .proc_handler = proc_do_large_bitmap,
651 },
652 {
653 .procname = "ip_no_pmtu_disc",
654 .data = &init_net.ipv4.sysctl_ip_no_pmtu_disc,
655 .maxlen = sizeof(int),
656 .mode = 0644,
657 .proc_handler = proc_dointvec
658 },
659 {
660 .procname = "ip_forward_use_pmtu",
661 .data = &init_net.ipv4.sysctl_ip_fwd_use_pmtu,
662 .maxlen = sizeof(int),
663 .mode = 0644,
664 .proc_handler = proc_dointvec,
665 },
666 {
667 .procname = "ip_nonlocal_bind",
668 .data = &init_net.ipv4.sysctl_ip_nonlocal_bind,
669 .maxlen = sizeof(int),
670 .mode = 0644,
671 .proc_handler = proc_dointvec
672 },
673 {
674 .procname = "fwmark_reflect",
675 .data = &init_net.ipv4.sysctl_fwmark_reflect,
676 .maxlen = sizeof(int),
677 .mode = 0644,
678 .proc_handler = proc_dointvec,
679 },
680 {
681 .procname = "tcp_fwmark_accept",
682 .data = &init_net.ipv4.sysctl_tcp_fwmark_accept,
683 .maxlen = sizeof(int),
684 .mode = 0644,
685 .proc_handler = proc_dointvec,
686 },
687 #ifdef CONFIG_NET_L3_MASTER_DEV
688 {
689 .procname = "tcp_l3mdev_accept",
690 .data = &init_net.ipv4.sysctl_tcp_l3mdev_accept,
691 .maxlen = sizeof(int),
692 .mode = 0644,
693 .proc_handler = proc_dointvec_minmax,
694 .extra1 = &zero,
695 .extra2 = &one,
696 },
697 #endif
698 {
699 .procname = "tcp_mtu_probing",
700 .data = &init_net.ipv4.sysctl_tcp_mtu_probing,
701 .maxlen = sizeof(int),
702 .mode = 0644,
703 .proc_handler = proc_dointvec,
704 },
705 {
706 .procname = "tcp_base_mss",
707 .data = &init_net.ipv4.sysctl_tcp_base_mss,
708 .maxlen = sizeof(int),
709 .mode = 0644,
710 .proc_handler = proc_dointvec,
711 },
712 {
713 .procname = "tcp_probe_threshold",
714 .data = &init_net.ipv4.sysctl_tcp_probe_threshold,
715 .maxlen = sizeof(int),
716 .mode = 0644,
717 .proc_handler = proc_dointvec,
718 },
719 {
720 .procname = "tcp_probe_interval",
721 .data = &init_net.ipv4.sysctl_tcp_probe_interval,
722 .maxlen = sizeof(int),
723 .mode = 0644,
724 .proc_handler = proc_dointvec,
725 },
726 {
727 .procname = "igmp_link_local_mcast_reports",
728 .data = &init_net.ipv4.sysctl_igmp_llm_reports,
729 .maxlen = sizeof(int),
730 .mode = 0644,
731 .proc_handler = proc_dointvec
732 },
733 {
734 .procname = "igmp_max_memberships",
735 .data = &init_net.ipv4.sysctl_igmp_max_memberships,
736 .maxlen = sizeof(int),
737 .mode = 0644,
738 .proc_handler = proc_dointvec
739 },
740 {
741 .procname = "igmp_max_msf",
742 .data = &init_net.ipv4.sysctl_igmp_max_msf,
743 .maxlen = sizeof(int),
744 .mode = 0644,
745 .proc_handler = proc_dointvec
746 },
747 #ifdef CONFIG_IP_MULTICAST
748 {
749 .procname = "igmp_qrv",
750 .data = &init_net.ipv4.sysctl_igmp_qrv,
751 .maxlen = sizeof(int),
752 .mode = 0644,
753 .proc_handler = proc_dointvec_minmax,
754 .extra1 = &one
755 },
756 #endif
757 {
758 .procname = "tcp_congestion_control",
759 .data = &init_net.ipv4.tcp_congestion_control,
760 .mode = 0644,
761 .maxlen = TCP_CA_NAME_MAX,
762 .proc_handler = proc_tcp_congestion_control,
763 },
764 {
765 .procname = "tcp_keepalive_time",
766 .data = &init_net.ipv4.sysctl_tcp_keepalive_time,
767 .maxlen = sizeof(int),
768 .mode = 0644,
769 .proc_handler = proc_dointvec_jiffies,
770 },
771 {
772 .procname = "tcp_keepalive_probes",
773 .data = &init_net.ipv4.sysctl_tcp_keepalive_probes,
774 .maxlen = sizeof(int),
775 .mode = 0644,
776 .proc_handler = proc_dointvec
777 },
778 {
779 .procname = "tcp_keepalive_intvl",
780 .data = &init_net.ipv4.sysctl_tcp_keepalive_intvl,
781 .maxlen = sizeof(int),
782 .mode = 0644,
783 .proc_handler = proc_dointvec_jiffies,
784 },
785 {
786 .procname = "tcp_syn_retries",
787 .data = &init_net.ipv4.sysctl_tcp_syn_retries,
788 .maxlen = sizeof(int),
789 .mode = 0644,
790 .proc_handler = proc_dointvec_minmax,
791 .extra1 = &tcp_syn_retries_min,
792 .extra2 = &tcp_syn_retries_max
793 },
794 {
795 .procname = "tcp_synack_retries",
796 .data = &init_net.ipv4.sysctl_tcp_synack_retries,
797 .maxlen = sizeof(int),
798 .mode = 0644,
799 .proc_handler = proc_dointvec
800 },
801 #ifdef CONFIG_SYN_COOKIES
802 {
803 .procname = "tcp_syncookies",
804 .data = &init_net.ipv4.sysctl_tcp_syncookies,
805 .maxlen = sizeof(int),
806 .mode = 0644,
807 .proc_handler = proc_dointvec
808 },
809 #endif
810 {
811 .procname = "tcp_reordering",
812 .data = &init_net.ipv4.sysctl_tcp_reordering,
813 .maxlen = sizeof(int),
814 .mode = 0644,
815 .proc_handler = proc_dointvec
816 },
817 {
818 .procname = "tcp_retries1",
819 .data = &init_net.ipv4.sysctl_tcp_retries1,
820 .maxlen = sizeof(int),
821 .mode = 0644,
822 .proc_handler = proc_dointvec_minmax,
823 .extra2 = &tcp_retr1_max
824 },
825 {
826 .procname = "tcp_retries2",
827 .data = &init_net.ipv4.sysctl_tcp_retries2,
828 .maxlen = sizeof(int),
829 .mode = 0644,
830 .proc_handler = proc_dointvec
831 },
832 {
833 .procname = "tcp_orphan_retries",
834 .data = &init_net.ipv4.sysctl_tcp_orphan_retries,
835 .maxlen = sizeof(int),
836 .mode = 0644,
837 .proc_handler = proc_dointvec
838 },
839 {
840 .procname = "tcp_fin_timeout",
841 .data = &init_net.ipv4.sysctl_tcp_fin_timeout,
842 .maxlen = sizeof(int),
843 .mode = 0644,
844 .proc_handler = proc_dointvec_jiffies,
845 },
846 {
847 .procname = "tcp_notsent_lowat",
848 .data = &init_net.ipv4.sysctl_tcp_notsent_lowat,
849 .maxlen = sizeof(unsigned int),
850 .mode = 0644,
851 .proc_handler = proc_douintvec,
852 },
853 {
854 .procname = "tcp_tw_reuse",
855 .data = &init_net.ipv4.sysctl_tcp_tw_reuse,
856 .maxlen = sizeof(int),
857 .mode = 0644,
858 .proc_handler = proc_dointvec_minmax,
859 .extra1 = &zero,
860 .extra2 = &two,
861 },
862 {
863 .procname = "tcp_max_tw_buckets",
864 .data = &init_net.ipv4.tcp_death_row.sysctl_max_tw_buckets,
865 .maxlen = sizeof(int),
866 .mode = 0644,
867 .proc_handler = proc_dointvec
868 },
869 {
870 .procname = "tcp_max_syn_backlog",
871 .data = &init_net.ipv4.sysctl_max_syn_backlog,
872 .maxlen = sizeof(int),
873 .mode = 0644,
874 .proc_handler = proc_dointvec
875 },
876 {
877 .procname = "tcp_fastopen",
878 .data = &init_net.ipv4.sysctl_tcp_fastopen,
879 .maxlen = sizeof(int),
880 .mode = 0644,
881 .proc_handler = proc_dointvec,
882 },
883 {
884 .procname = "tcp_fastopen_key",
885 .mode = 0600,
886 .data = &init_net.ipv4.sysctl_tcp_fastopen,
887 .maxlen = ((TCP_FASTOPEN_KEY_LENGTH * 2) + 10),
888 .proc_handler = proc_tcp_fastopen_key,
889 },
890 {
891 .procname = "tcp_fastopen_blackhole_timeout_sec",
892 .data = &init_net.ipv4.sysctl_tcp_fastopen_blackhole_timeout,
893 .maxlen = sizeof(int),
894 .mode = 0644,
895 .proc_handler = proc_tfo_blackhole_detect_timeout,
896 .extra1 = &zero,
897 },
898 #ifdef CONFIG_IP_ROUTE_MULTIPATH
899 {
900 .procname = "fib_multipath_use_neigh",
901 .data = &init_net.ipv4.sysctl_fib_multipath_use_neigh,
902 .maxlen = sizeof(int),
903 .mode = 0644,
904 .proc_handler = proc_dointvec_minmax,
905 .extra1 = &zero,
906 .extra2 = &one,
907 },
908 {
909 .procname = "fib_multipath_hash_policy",
910 .data = &init_net.ipv4.sysctl_fib_multipath_hash_policy,
911 .maxlen = sizeof(int),
912 .mode = 0644,
913 .proc_handler = proc_fib_multipath_hash_policy,
914 .extra1 = &zero,
915 .extra2 = &one,
916 },
917 #endif
918 {
919 .procname = "ip_unprivileged_port_start",
920 .maxlen = sizeof(int),
921 .data = &init_net.ipv4.sysctl_ip_prot_sock,
922 .mode = 0644,
923 .proc_handler = ipv4_privileged_ports,
924 },
925 #ifdef CONFIG_NET_L3_MASTER_DEV
926 {
927 .procname = "udp_l3mdev_accept",
928 .data = &init_net.ipv4.sysctl_udp_l3mdev_accept,
929 .maxlen = sizeof(int),
930 .mode = 0644,
931 .proc_handler = proc_dointvec_minmax,
932 .extra1 = &zero,
933 .extra2 = &one,
934 },
935 #endif
936 {
937 .procname = "tcp_sack",
938 .data = &init_net.ipv4.sysctl_tcp_sack,
939 .maxlen = sizeof(int),
940 .mode = 0644,
941 .proc_handler = proc_dointvec
942 },
943 {
944 .procname = "tcp_window_scaling",
945 .data = &init_net.ipv4.sysctl_tcp_window_scaling,
946 .maxlen = sizeof(int),
947 .mode = 0644,
948 .proc_handler = proc_dointvec
949 },
950 {
951 .procname = "tcp_timestamps",
952 .data = &init_net.ipv4.sysctl_tcp_timestamps,
953 .maxlen = sizeof(int),
954 .mode = 0644,
955 .proc_handler = proc_dointvec
956 },
957 {
958 .procname = "tcp_early_retrans",
959 .data = &init_net.ipv4.sysctl_tcp_early_retrans,
960 .maxlen = sizeof(int),
961 .mode = 0644,
962 .proc_handler = proc_dointvec_minmax,
963 .extra1 = &zero,
964 .extra2 = &four,
965 },
966 {
967 .procname = "tcp_recovery",
968 .data = &init_net.ipv4.sysctl_tcp_recovery,
969 .maxlen = sizeof(int),
970 .mode = 0644,
971 .proc_handler = proc_dointvec,
972 },
973 {
974 .procname = "tcp_thin_linear_timeouts",
975 .data = &init_net.ipv4.sysctl_tcp_thin_linear_timeouts,
976 .maxlen = sizeof(int),
977 .mode = 0644,
978 .proc_handler = proc_dointvec
979 },
980 {
981 .procname = "tcp_slow_start_after_idle",
982 .data = &init_net.ipv4.sysctl_tcp_slow_start_after_idle,
983 .maxlen = sizeof(int),
984 .mode = 0644,
985 .proc_handler = proc_dointvec
986 },
987 {
988 .procname = "tcp_retrans_collapse",
989 .data = &init_net.ipv4.sysctl_tcp_retrans_collapse,
990 .maxlen = sizeof(int),
991 .mode = 0644,
992 .proc_handler = proc_dointvec
993 },
994 {
995 .procname = "tcp_stdurg",
996 .data = &init_net.ipv4.sysctl_tcp_stdurg,
997 .maxlen = sizeof(int),
998 .mode = 0644,
999 .proc_handler = proc_dointvec
1000 },
1001 {
1002 .procname = "tcp_rfc1337",
1003 .data = &init_net.ipv4.sysctl_tcp_rfc1337,
1004 .maxlen = sizeof(int),
1005 .mode = 0644,
1006 .proc_handler = proc_dointvec
1007 },
1008 {
1009 .procname = "tcp_abort_on_overflow",
1010 .data = &init_net.ipv4.sysctl_tcp_abort_on_overflow,
1011 .maxlen = sizeof(int),
1012 .mode = 0644,
1013 .proc_handler = proc_dointvec
1014 },
1015 {
1016 .procname = "tcp_fack",
1017 .data = &init_net.ipv4.sysctl_tcp_fack,
1018 .maxlen = sizeof(int),
1019 .mode = 0644,
1020 .proc_handler = proc_dointvec
1021 },
1022 {
1023 .procname = "tcp_max_reordering",
1024 .data = &init_net.ipv4.sysctl_tcp_max_reordering,
1025 .maxlen = sizeof(int),
1026 .mode = 0644,
1027 .proc_handler = proc_dointvec
1028 },
1029 {
1030 .procname = "tcp_dsack",
1031 .data = &init_net.ipv4.sysctl_tcp_dsack,
1032 .maxlen = sizeof(int),
1033 .mode = 0644,
1034 .proc_handler = proc_dointvec
1035 },
1036 {
1037 .procname = "tcp_app_win",
1038 .data = &init_net.ipv4.sysctl_tcp_app_win,
1039 .maxlen = sizeof(int),
1040 .mode = 0644,
1041 .proc_handler = proc_dointvec
1042 },
1043 {
1044 .procname = "tcp_adv_win_scale",
1045 .data = &init_net.ipv4.sysctl_tcp_adv_win_scale,
1046 .maxlen = sizeof(int),
1047 .mode = 0644,
1048 .proc_handler = proc_dointvec_minmax,
1049 .extra1 = &tcp_adv_win_scale_min,
1050 .extra2 = &tcp_adv_win_scale_max,
1051 },
1052 {
1053 .procname = "tcp_frto",
1054 .data = &init_net.ipv4.sysctl_tcp_frto,
1055 .maxlen = sizeof(int),
1056 .mode = 0644,
1057 .proc_handler = proc_dointvec
1058 },
1059 {
1060 .procname = "tcp_no_metrics_save",
1061 .data = &init_net.ipv4.sysctl_tcp_nometrics_save,
1062 .maxlen = sizeof(int),
1063 .mode = 0644,
1064 .proc_handler = proc_dointvec,
1065 },
1066 {
1067 .procname = "tcp_moderate_rcvbuf",
1068 .data = &init_net.ipv4.sysctl_tcp_moderate_rcvbuf,
1069 .maxlen = sizeof(int),
1070 .mode = 0644,
1071 .proc_handler = proc_dointvec,
1072 },
1073 {
1074 .procname = "tcp_tso_win_divisor",
1075 .data = &init_net.ipv4.sysctl_tcp_tso_win_divisor,
1076 .maxlen = sizeof(int),
1077 .mode = 0644,
1078 .proc_handler = proc_dointvec,
1079 },
1080 {
1081 .procname = "tcp_workaround_signed_windows",
1082 .data = &init_net.ipv4.sysctl_tcp_workaround_signed_windows,
1083 .maxlen = sizeof(int),
1084 .mode = 0644,
1085 .proc_handler = proc_dointvec
1086 },
1087 {
1088 .procname = "tcp_limit_output_bytes",
1089 .data = &init_net.ipv4.sysctl_tcp_limit_output_bytes,
1090 .maxlen = sizeof(int),
1091 .mode = 0644,
1092 .proc_handler = proc_dointvec
1093 },
1094 {
1095 .procname = "tcp_challenge_ack_limit",
1096 .data = &init_net.ipv4.sysctl_tcp_challenge_ack_limit,
1097 .maxlen = sizeof(int),
1098 .mode = 0644,
1099 .proc_handler = proc_dointvec
1100 },
1101 {
1102 .procname = "tcp_min_tso_segs",
1103 .data = &init_net.ipv4.sysctl_tcp_min_tso_segs,
1104 .maxlen = sizeof(int),
1105 .mode = 0644,
1106 .proc_handler = proc_dointvec_minmax,
1107 .extra1 = &one,
1108 .extra2 = &gso_max_segs,
1109 },
1110 {
1111 .procname = "tcp_min_rtt_wlen",
1112 .data = &init_net.ipv4.sysctl_tcp_min_rtt_wlen,
1113 .maxlen = sizeof(int),
1114 .mode = 0644,
1115 .proc_handler = proc_dointvec
1116 },
1117 {
1118 .procname = "tcp_autocorking",
1119 .data = &init_net.ipv4.sysctl_tcp_autocorking,
1120 .maxlen = sizeof(int),
1121 .mode = 0644,
1122 .proc_handler = proc_dointvec_minmax,
1123 .extra1 = &zero,
1124 .extra2 = &one,
1125 },
1126 {
1127 .procname = "tcp_invalid_ratelimit",
1128 .data = &init_net.ipv4.sysctl_tcp_invalid_ratelimit,
1129 .maxlen = sizeof(int),
1130 .mode = 0644,
1131 .proc_handler = proc_dointvec_ms_jiffies,
1132 },
1133 {
1134 .procname = "tcp_pacing_ss_ratio",
1135 .data = &init_net.ipv4.sysctl_tcp_pacing_ss_ratio,
1136 .maxlen = sizeof(int),
1137 .mode = 0644,
1138 .proc_handler = proc_dointvec_minmax,
1139 .extra1 = &zero,
1140 .extra2 = &thousand,
1141 },
1142 {
1143 .procname = "tcp_pacing_ca_ratio",
1144 .data = &init_net.ipv4.sysctl_tcp_pacing_ca_ratio,
1145 .maxlen = sizeof(int),
1146 .mode = 0644,
1147 .proc_handler = proc_dointvec_minmax,
1148 .extra1 = &zero,
1149 .extra2 = &thousand,
1150 },
1151 {
1152 .procname = "tcp_wmem",
1153 .data = &init_net.ipv4.sysctl_tcp_wmem,
1154 .maxlen = sizeof(init_net.ipv4.sysctl_tcp_wmem),
1155 .mode = 0644,
1156 .proc_handler = proc_dointvec_minmax,
1157 .extra1 = &one,
1158 },
1159 {
1160 .procname = "tcp_rmem",
1161 .data = &init_net.ipv4.sysctl_tcp_rmem,
1162 .maxlen = sizeof(init_net.ipv4.sysctl_tcp_rmem),
1163 .mode = 0644,
1164 .proc_handler = proc_dointvec_minmax,
1165 .extra1 = &one,
1166 },
1167 {
1168 .procname = "tcp_comp_sack_delay_ns",
1169 .data = &init_net.ipv4.sysctl_tcp_comp_sack_delay_ns,
1170 .maxlen = sizeof(unsigned long),
1171 .mode = 0644,
1172 .proc_handler = proc_doulongvec_minmax,
1173 },
1174 {
1175 .procname = "tcp_comp_sack_nr",
1176 .data = &init_net.ipv4.sysctl_tcp_comp_sack_nr,
1177 .maxlen = sizeof(int),
1178 .mode = 0644,
1179 .proc_handler = proc_dointvec_minmax,
1180 .extra1 = &zero,
1181 .extra2 = &comp_sack_nr_max,
1182 },
1183 {
1184 .procname = "udp_rmem_min",
1185 .data = &init_net.ipv4.sysctl_udp_rmem_min,
1186 .maxlen = sizeof(init_net.ipv4.sysctl_udp_rmem_min),
1187 .mode = 0644,
1188 .proc_handler = proc_dointvec_minmax,
1189 .extra1 = &one
1190 },
1191 {
1192 .procname = "udp_wmem_min",
1193 .data = &init_net.ipv4.sysctl_udp_wmem_min,
1194 .maxlen = sizeof(init_net.ipv4.sysctl_udp_wmem_min),
1195 .mode = 0644,
1196 .proc_handler = proc_dointvec_minmax,
1197 .extra1 = &one
1198 },
1199 { }
1200 };
1201
1202 static __net_init int ipv4_sysctl_init_net(struct net *net)
1203 {
1204 struct ctl_table *table;
1205
1206 table = ipv4_net_table;
1207 if (!net_eq(net, &init_net)) {
1208 int i;
1209
1210 table = kmemdup(table, sizeof(ipv4_net_table), GFP_KERNEL);
1211 if (!table)
1212 goto err_alloc;
1213
1214 /* Update the variables to point into the current struct net */
1215 for (i = 0; i < ARRAY_SIZE(ipv4_net_table) - 1; i++)
1216 table[i].data += (void *)net - (void *)&init_net;
1217 }
1218
1219 net->ipv4.ipv4_hdr = register_net_sysctl(net, "net/ipv4", table);
1220 if (!net->ipv4.ipv4_hdr)
1221 goto err_reg;
1222
1223 net->ipv4.sysctl_local_reserved_ports = kzalloc(65536 / 8, GFP_KERNEL);
1224 if (!net->ipv4.sysctl_local_reserved_ports)
1225 goto err_ports;
1226
1227 return 0;
1228
1229 err_ports:
1230 unregister_net_sysctl_table(net->ipv4.ipv4_hdr);
1231 err_reg:
1232 if (!net_eq(net, &init_net))
1233 kfree(table);
1234 err_alloc:
1235 return -ENOMEM;
1236 }
1237
1238 static __net_exit void ipv4_sysctl_exit_net(struct net *net)
1239 {
1240 struct ctl_table *table;
1241
1242 kfree(net->ipv4.sysctl_local_reserved_ports);
1243 table = net->ipv4.ipv4_hdr->ctl_table_arg;
1244 unregister_net_sysctl_table(net->ipv4.ipv4_hdr);
1245 kfree(table);
1246 }
1247
1248 static __net_initdata struct pernet_operations ipv4_sysctl_ops = {
1249 .init = ipv4_sysctl_init_net,
1250 .exit = ipv4_sysctl_exit_net,
1251 };
1252
1253 static __init int sysctl_ipv4_init(void)
1254 {
1255 struct ctl_table_header *hdr;
1256
1257 hdr = register_net_sysctl(&init_net, "net/ipv4", ipv4_table);
1258 if (!hdr)
1259 return -ENOMEM;
1260
1261 if (register_pernet_subsys(&ipv4_sysctl_ops)) {
1262 unregister_net_sysctl_table(hdr);
1263 return -ENOMEM;
1264 }
1265
1266 return 0;
1267 }
1268
1269 __initcall(sysctl_ipv4_init);
Linux with added FPC-III support