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defconfig: exynos9610: Re-add dropped Wi-Fi AP options lost
[GitHub/LineageOS/android_kernel_motorola_exynos9610.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
30 static int zero;
31 static int one = 1;
32 static int four = 4;
33 static int thousand = 1000;
34 static int gso_max_segs = GSO_MAX_SEGS;
35 static int tcp_retr1_max = 255;
36 static int ip_local_port_range_min[] = { 1, 1 };
37 static int ip_local_port_range_max[] = { 65535, 65535 };
38 static int tcp_adv_win_scale_min = -31;
39 static int tcp_adv_win_scale_max = 31;
40 static int ip_privileged_port_min;
41 static int ip_privileged_port_max = 65535;
42 static int ip_ttl_min = 1;
43 static int ip_ttl_max = 255;
44 static int tcp_syn_retries_min = 1;
45 static int tcp_syn_retries_max = MAX_TCP_SYNCNT;
46 static int ip_ping_group_range_min[] = { 0, 0 };
47 static int ip_ping_group_range_max[] = { GID_T_MAX, GID_T_MAX };
48
49 /* obsolete */
50 static int sysctl_tcp_low_latency __read_mostly;
51
52 /* Update system visible IP port range */
53 static void set_local_port_range(struct net *net, int range[2])
54 {
55 bool same_parity = !((range[0] ^ range[1]) & 1);
56
57 write_seqlock_bh(&net->ipv4.ip_local_ports.lock);
58 if (same_parity && !net->ipv4.ip_local_ports.warned) {
59 net->ipv4.ip_local_ports.warned = true;
60 pr_err_ratelimited("ip_local_port_range: prefer different parity for start/end values.\n");
61 }
62 net->ipv4.ip_local_ports.range[0] = range[0];
63 net->ipv4.ip_local_ports.range[1] = range[1];
64 write_sequnlock_bh(&net->ipv4.ip_local_ports.lock);
65 }
66
67 /* Validate changes from /proc interface. */
68 static int ipv4_local_port_range(struct ctl_table *table, int write,
69 void __user *buffer,
70 size_t *lenp, loff_t *ppos)
71 {
72 struct net *net =
73 container_of(table->data, struct net, ipv4.ip_local_ports.range);
74 int ret;
75 int range[2];
76 struct ctl_table tmp = {
77 .data = &range,
78 .maxlen = sizeof(range),
79 .mode = table->mode,
80 .extra1 = &ip_local_port_range_min,
81 .extra2 = &ip_local_port_range_max,
82 };
83
84 inet_get_local_port_range(net, &range[0], &range[1]);
85
86 ret = proc_dointvec_minmax(&tmp, write, buffer, lenp, ppos);
87
88 if (write && ret == 0) {
89 /* Ensure that the upper limit is not smaller than the lower,
90 * and that the lower does not encroach upon the privileged
91 * port limit.
92 */
93 if ((range[1] < range[0]) ||
94 (range[0] < net->ipv4.sysctl_ip_prot_sock))
95 ret = -EINVAL;
96 else
97 set_local_port_range(net, range);
98 }
99
100 return ret;
101 }
102
103 /* Validate changes from /proc interface. */
104 static int ipv4_privileged_ports(struct ctl_table *table, int write,
105 void __user *buffer, size_t *lenp, loff_t *ppos)
106 {
107 struct net *net = container_of(table->data, struct net,
108 ipv4.sysctl_ip_prot_sock);
109 int ret;
110 int pports;
111 int range[2];
112 struct ctl_table tmp = {
113 .data = &pports,
114 .maxlen = sizeof(pports),
115 .mode = table->mode,
116 .extra1 = &ip_privileged_port_min,
117 .extra2 = &ip_privileged_port_max,
118 };
119
120 pports = net->ipv4.sysctl_ip_prot_sock;
121
122 ret = proc_dointvec_minmax(&tmp, write, buffer, lenp, ppos);
123
124 if (write && ret == 0) {
125 inet_get_local_port_range(net, &range[0], &range[1]);
126 /* Ensure that the local port range doesn't overlap with the
127 * privileged port range.
128 */
129 if (range[0] < pports)
130 ret = -EINVAL;
131 else
132 net->ipv4.sysctl_ip_prot_sock = pports;
133 }
134
135 return ret;
136 }
137
138 static void inet_get_ping_group_range_table(struct ctl_table *table, kgid_t *low, kgid_t *high)
139 {
140 kgid_t *data = table->data;
141 struct net *net =
142 container_of(table->data, struct net, ipv4.ping_group_range.range);
143 unsigned int seq;
144 do {
145 seq = read_seqbegin(&net->ipv4.ping_group_range.lock);
146
147 *low = data[0];
148 *high = data[1];
149 } while (read_seqretry(&net->ipv4.ping_group_range.lock, seq));
150 }
151
152 /* Update system visible IP port range */
153 static void set_ping_group_range(struct ctl_table *table, kgid_t low, kgid_t high)
154 {
155 kgid_t *data = table->data;
156 struct net *net =
157 container_of(table->data, struct net, ipv4.ping_group_range.range);
158 write_seqlock(&net->ipv4.ping_group_range.lock);
159 data[0] = low;
160 data[1] = high;
161 write_sequnlock(&net->ipv4.ping_group_range.lock);
162 }
163
164 /* Validate changes from /proc interface. */
165 static int ipv4_ping_group_range(struct ctl_table *table, int write,
166 void __user *buffer,
167 size_t *lenp, loff_t *ppos)
168 {
169 struct user_namespace *user_ns = current_user_ns();
170 int ret;
171 gid_t urange[2];
172 kgid_t low, high;
173 struct ctl_table tmp = {
174 .data = &urange,
175 .maxlen = sizeof(urange),
176 .mode = table->mode,
177 .extra1 = &ip_ping_group_range_min,
178 .extra2 = &ip_ping_group_range_max,
179 };
180
181 inet_get_ping_group_range_table(table, &low, &high);
182 urange[0] = from_kgid_munged(user_ns, low);
183 urange[1] = from_kgid_munged(user_ns, high);
184 ret = proc_dointvec_minmax(&tmp, write, buffer, lenp, ppos);
185
186 if (write && ret == 0) {
187 low = make_kgid(user_ns, urange[0]);
188 high = make_kgid(user_ns, urange[1]);
189 if (!gid_valid(low) || !gid_valid(high))
190 return -EINVAL;
191 if (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 /* Validate changes from /proc interface. */
202 static int proc_tcp_default_init_rwnd(struct ctl_table *ctl, int write,
203 void __user *buffer,
204 size_t *lenp, loff_t *ppos)
205 {
206 int old_value = *(int *)ctl->data;
207 int ret = proc_dointvec(ctl, write, buffer, lenp, ppos);
208 int new_value = *(int *)ctl->data;
209
210 if (write && ret == 0 && (new_value < 3 || new_value > 100))
211 *(int *)ctl->data = old_value;
212
213 return ret;
214 }
215
216 static int proc_tcp_congestion_control(struct ctl_table *ctl, int write,
217 void __user *buffer, size_t *lenp, loff_t *ppos)
218 {
219 char val[TCP_CA_NAME_MAX];
220 struct ctl_table tbl = {
221 .data = val,
222 .maxlen = TCP_CA_NAME_MAX,
223 };
224 int ret;
225
226 tcp_get_default_congestion_control(val);
227
228 ret = proc_dostring(&tbl, write, buffer, lenp, ppos);
229 if (write && ret == 0)
230 ret = tcp_set_default_congestion_control(val);
231 return ret;
232 }
233
234 static int proc_tcp_available_congestion_control(struct ctl_table *ctl,
235 int write,
236 void __user *buffer, size_t *lenp,
237 loff_t *ppos)
238 {
239 struct ctl_table tbl = { .maxlen = TCP_CA_BUF_MAX, };
240 int ret;
241
242 tbl.data = kmalloc(tbl.maxlen, GFP_USER);
243 if (!tbl.data)
244 return -ENOMEM;
245 tcp_get_available_congestion_control(tbl.data, TCP_CA_BUF_MAX);
246 ret = proc_dostring(&tbl, write, buffer, lenp, ppos);
247 kfree(tbl.data);
248 return ret;
249 }
250
251 static int proc_allowed_congestion_control(struct ctl_table *ctl,
252 int write,
253 void __user *buffer, size_t *lenp,
254 loff_t *ppos)
255 {
256 struct ctl_table tbl = { .maxlen = TCP_CA_BUF_MAX };
257 int ret;
258
259 tbl.data = kmalloc(tbl.maxlen, GFP_USER);
260 if (!tbl.data)
261 return -ENOMEM;
262
263 tcp_get_allowed_congestion_control(tbl.data, tbl.maxlen);
264 ret = proc_dostring(&tbl, write, buffer, lenp, ppos);
265 if (write && ret == 0)
266 ret = tcp_set_allowed_congestion_control(tbl.data);
267 kfree(tbl.data);
268 return ret;
269 }
270
271 static int proc_tcp_fastopen_key(struct ctl_table *ctl, int write,
272 void __user *buffer, size_t *lenp,
273 loff_t *ppos)
274 {
275 struct ctl_table tbl = { .maxlen = (TCP_FASTOPEN_KEY_LENGTH * 2 + 10) };
276 struct tcp_fastopen_context *ctxt;
277 u32 user_key[4]; /* 16 bytes, matching TCP_FASTOPEN_KEY_LENGTH */
278 __le32 key[4];
279 int ret, i;
280
281 tbl.data = kmalloc(tbl.maxlen, GFP_KERNEL);
282 if (!tbl.data)
283 return -ENOMEM;
284
285 rcu_read_lock();
286 ctxt = rcu_dereference(tcp_fastopen_ctx);
287 if (ctxt)
288 memcpy(key, ctxt->key, TCP_FASTOPEN_KEY_LENGTH);
289 else
290 memset(key, 0, sizeof(key));
291 rcu_read_unlock();
292
293 for (i = 0; i < ARRAY_SIZE(key); i++)
294 user_key[i] = le32_to_cpu(key[i]);
295
296 snprintf(tbl.data, tbl.maxlen, "%08x-%08x-%08x-%08x",
297 user_key[0], user_key[1], user_key[2], user_key[3]);
298 ret = proc_dostring(&tbl, write, buffer, lenp, ppos);
299
300 if (write && ret == 0) {
301 if (sscanf(tbl.data, "%x-%x-%x-%x", user_key, user_key + 1,
302 user_key + 2, user_key + 3) != 4) {
303 ret = -EINVAL;
304 goto bad_key;
305 }
306 /* Generate a dummy secret but don't publish it. This
307 * is needed so we don't regenerate a new key on the
308 * first invocation of tcp_fastopen_cookie_gen
309 */
310 tcp_fastopen_init_key_once(false);
311
312 for (i = 0; i < ARRAY_SIZE(user_key); i++)
313 key[i] = cpu_to_le32(user_key[i]);
314
315 tcp_fastopen_reset_cipher(key, TCP_FASTOPEN_KEY_LENGTH);
316 }
317
318 bad_key:
319 pr_debug("proc FO key set 0x%x-%x-%x-%x <- 0x%s: %u\n",
320 user_key[0], user_key[1], user_key[2], user_key[3],
321 (char *)tbl.data, ret);
322 kfree(tbl.data);
323 return ret;
324 }
325
326 static void proc_configure_early_demux(int enabled, int protocol)
327 {
328 struct net_protocol *ipprot;
329 #if IS_ENABLED(CONFIG_IPV6)
330 struct inet6_protocol *ip6prot;
331 #endif
332
333 rcu_read_lock();
334
335 ipprot = rcu_dereference(inet_protos[protocol]);
336 if (ipprot)
337 ipprot->early_demux = enabled ? ipprot->early_demux_handler :
338 NULL;
339
340 #if IS_ENABLED(CONFIG_IPV6)
341 ip6prot = rcu_dereference(inet6_protos[protocol]);
342 if (ip6prot)
343 ip6prot->early_demux = enabled ? ip6prot->early_demux_handler :
344 NULL;
345 #endif
346 rcu_read_unlock();
347 }
348
349 static int proc_tcp_early_demux(struct ctl_table *table, int write,
350 void __user *buffer, size_t *lenp, loff_t *ppos)
351 {
352 int ret = 0;
353
354 ret = proc_dointvec(table, write, buffer, lenp, ppos);
355
356 if (write && !ret) {
357 int enabled = init_net.ipv4.sysctl_tcp_early_demux;
358
359 proc_configure_early_demux(enabled, IPPROTO_TCP);
360 }
361
362 return ret;
363 }
364
365 static int proc_udp_early_demux(struct ctl_table *table, int write,
366 void __user *buffer, size_t *lenp, loff_t *ppos)
367 {
368 int ret = 0;
369
370 ret = proc_dointvec(table, write, buffer, lenp, ppos);
371
372 if (write && !ret) {
373 int enabled = init_net.ipv4.sysctl_udp_early_demux;
374
375 proc_configure_early_demux(enabled, IPPROTO_UDP);
376 }
377
378 return ret;
379 }
380
381 static int proc_tfo_blackhole_detect_timeout(struct ctl_table *table,
382 int write,
383 void __user *buffer,
384 size_t *lenp, loff_t *ppos)
385 {
386 int ret;
387
388 ret = proc_dointvec_minmax(table, write, buffer, lenp, ppos);
389 if (write && ret == 0)
390 tcp_fastopen_active_timeout_reset();
391
392 return ret;
393 }
394
395 static int proc_tcp_available_ulp(struct ctl_table *ctl,
396 int write,
397 void __user *buffer, size_t *lenp,
398 loff_t *ppos)
399 {
400 struct ctl_table tbl = { .maxlen = TCP_ULP_BUF_MAX, };
401 int ret;
402
403 tbl.data = kmalloc(tbl.maxlen, GFP_USER);
404 if (!tbl.data)
405 return -ENOMEM;
406 tcp_get_available_ulp(tbl.data, TCP_ULP_BUF_MAX);
407 ret = proc_dostring(&tbl, write, buffer, lenp, ppos);
408 kfree(tbl.data);
409
410 return ret;
411 }
412
413 static struct ctl_table ipv4_table[] = {
414 {
415 .procname = "tcp_retrans_collapse",
416 .data = &sysctl_tcp_retrans_collapse,
417 .maxlen = sizeof(int),
418 .mode = 0644,
419 .proc_handler = proc_dointvec
420 },
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 = "tcp_fastopen",
430 .data = &sysctl_tcp_fastopen,
431 .maxlen = sizeof(int),
432 .mode = 0644,
433 .proc_handler = proc_dointvec,
434 },
435 {
436 .procname = "tcp_fastopen_key",
437 .mode = 0600,
438 .maxlen = ((TCP_FASTOPEN_KEY_LENGTH * 2) + 10),
439 .proc_handler = proc_tcp_fastopen_key,
440 },
441 {
442 .procname = "tcp_fastopen_blackhole_timeout_sec",
443 .data = &sysctl_tcp_fastopen_blackhole_timeout,
444 .maxlen = sizeof(int),
445 .mode = 0644,
446 .proc_handler = proc_tfo_blackhole_detect_timeout,
447 .extra1 = &zero,
448 },
449 {
450 .procname = "tcp_abort_on_overflow",
451 .data = &sysctl_tcp_abort_on_overflow,
452 .maxlen = sizeof(int),
453 .mode = 0644,
454 .proc_handler = proc_dointvec
455 },
456 {
457 .procname = "tcp_stdurg",
458 .data = &sysctl_tcp_stdurg,
459 .maxlen = sizeof(int),
460 .mode = 0644,
461 .proc_handler = proc_dointvec
462 },
463 {
464 .procname = "tcp_rfc1337",
465 .data = &sysctl_tcp_rfc1337,
466 .maxlen = sizeof(int),
467 .mode = 0644,
468 .proc_handler = proc_dointvec
469 },
470 {
471 .procname = "inet_peer_threshold",
472 .data = &inet_peer_threshold,
473 .maxlen = sizeof(int),
474 .mode = 0644,
475 .proc_handler = proc_dointvec
476 },
477 {
478 .procname = "inet_peer_minttl",
479 .data = &inet_peer_minttl,
480 .maxlen = sizeof(int),
481 .mode = 0644,
482 .proc_handler = proc_dointvec_jiffies,
483 },
484 {
485 .procname = "inet_peer_maxttl",
486 .data = &inet_peer_maxttl,
487 .maxlen = sizeof(int),
488 .mode = 0644,
489 .proc_handler = proc_dointvec_jiffies,
490 },
491 {
492 .procname = "tcp_fack",
493 .data = &sysctl_tcp_fack,
494 .maxlen = sizeof(int),
495 .mode = 0644,
496 .proc_handler = proc_dointvec
497 },
498 {
499 .procname = "tcp_recovery",
500 .data = &sysctl_tcp_recovery,
501 .maxlen = sizeof(int),
502 .mode = 0644,
503 .proc_handler = proc_dointvec,
504 },
505 {
506 .procname = "tcp_max_reordering",
507 .data = &sysctl_tcp_max_reordering,
508 .maxlen = sizeof(int),
509 .mode = 0644,
510 .proc_handler = proc_dointvec
511 },
512 {
513 .procname = "tcp_dsack",
514 .data = &sysctl_tcp_dsack,
515 .maxlen = sizeof(int),
516 .mode = 0644,
517 .proc_handler = proc_dointvec
518 },
519 {
520 .procname = "tcp_mem",
521 .maxlen = sizeof(sysctl_tcp_mem),
522 .data = &sysctl_tcp_mem,
523 .mode = 0644,
524 .proc_handler = proc_doulongvec_minmax,
525 },
526 {
527 .procname = "tcp_wmem",
528 .data = &sysctl_tcp_wmem,
529 .maxlen = sizeof(sysctl_tcp_wmem),
530 .mode = 0644,
531 .proc_handler = proc_dointvec_minmax,
532 .extra1 = &one,
533 },
534 {
535 .procname = "tcp_rmem",
536 .data = &sysctl_tcp_rmem,
537 .maxlen = sizeof(sysctl_tcp_rmem),
538 .mode = 0644,
539 .proc_handler = proc_dointvec_minmax,
540 .extra1 = &one,
541 },
542 {
543 .procname = "tcp_app_win",
544 .data = &sysctl_tcp_app_win,
545 .maxlen = sizeof(int),
546 .mode = 0644,
547 .proc_handler = proc_dointvec
548 },
549 {
550 .procname = "tcp_adv_win_scale",
551 .data = &sysctl_tcp_adv_win_scale,
552 .maxlen = sizeof(int),
553 .mode = 0644,
554 .proc_handler = proc_dointvec_minmax,
555 .extra1 = &tcp_adv_win_scale_min,
556 .extra2 = &tcp_adv_win_scale_max,
557 },
558 {
559 .procname = "tcp_frto",
560 .data = &sysctl_tcp_frto,
561 .maxlen = sizeof(int),
562 .mode = 0644,
563 .proc_handler = proc_dointvec
564 },
565 {
566 .procname = "tcp_min_rtt_wlen",
567 .data = &sysctl_tcp_min_rtt_wlen,
568 .maxlen = sizeof(int),
569 .mode = 0644,
570 .proc_handler = proc_dointvec
571 },
572 {
573 .procname = "tcp_low_latency",
574 .data = &sysctl_tcp_low_latency,
575 .maxlen = sizeof(int),
576 .mode = 0644,
577 .proc_handler = proc_dointvec
578 },
579 {
580 .procname = "tcp_no_metrics_save",
581 .data = &sysctl_tcp_nometrics_save,
582 .maxlen = sizeof(int),
583 .mode = 0644,
584 .proc_handler = proc_dointvec,
585 },
586 {
587 .procname = "tcp_moderate_rcvbuf",
588 .data = &sysctl_tcp_moderate_rcvbuf,
589 .maxlen = sizeof(int),
590 .mode = 0644,
591 .proc_handler = proc_dointvec,
592 },
593 {
594 .procname = "tcp_tso_win_divisor",
595 .data = &sysctl_tcp_tso_win_divisor,
596 .maxlen = sizeof(int),
597 .mode = 0644,
598 .proc_handler = proc_dointvec,
599 },
600 {
601 .procname = "tcp_congestion_control",
602 .mode = 0644,
603 .maxlen = TCP_CA_NAME_MAX,
604 .proc_handler = proc_tcp_congestion_control,
605 },
606 {
607 .procname = "tcp_workaround_signed_windows",
608 .data = &sysctl_tcp_workaround_signed_windows,
609 .maxlen = sizeof(int),
610 .mode = 0644,
611 .proc_handler = proc_dointvec
612 },
613 {
614 .procname = "tcp_limit_output_bytes",
615 .data = &sysctl_tcp_limit_output_bytes,
616 .maxlen = sizeof(int),
617 .mode = 0644,
618 .proc_handler = proc_dointvec
619 },
620 {
621 .procname = "tcp_challenge_ack_limit",
622 .data = &sysctl_tcp_challenge_ack_limit,
623 .maxlen = sizeof(int),
624 .mode = 0644,
625 .proc_handler = proc_dointvec
626 },
627 {
628 .procname = "tcp_slow_start_after_idle",
629 .data = &sysctl_tcp_slow_start_after_idle,
630 .maxlen = sizeof(int),
631 .mode = 0644,
632 .proc_handler = proc_dointvec
633 },
634 #ifdef CONFIG_NETLABEL
635 {
636 .procname = "cipso_cache_enable",
637 .data = &cipso_v4_cache_enabled,
638 .maxlen = sizeof(int),
639 .mode = 0644,
640 .proc_handler = proc_dointvec,
641 },
642 {
643 .procname = "cipso_cache_bucket_size",
644 .data = &cipso_v4_cache_bucketsize,
645 .maxlen = sizeof(int),
646 .mode = 0644,
647 .proc_handler = proc_dointvec,
648 },
649 {
650 .procname = "cipso_rbm_optfmt",
651 .data = &cipso_v4_rbm_optfmt,
652 .maxlen = sizeof(int),
653 .mode = 0644,
654 .proc_handler = proc_dointvec,
655 },
656 {
657 .procname = "cipso_rbm_strictvalid",
658 .data = &cipso_v4_rbm_strictvalid,
659 .maxlen = sizeof(int),
660 .mode = 0644,
661 .proc_handler = proc_dointvec,
662 },
663 #endif /* CONFIG_NETLABEL */
664 {
665 .procname = "tcp_available_congestion_control",
666 .maxlen = TCP_CA_BUF_MAX,
667 .mode = 0444,
668 .proc_handler = proc_tcp_available_congestion_control,
669 },
670 {
671 .procname = "tcp_allowed_congestion_control",
672 .maxlen = TCP_CA_BUF_MAX,
673 .mode = 0644,
674 .proc_handler = proc_allowed_congestion_control,
675 },
676 {
677 .procname = "tcp_thin_linear_timeouts",
678 .data = &sysctl_tcp_thin_linear_timeouts,
679 .maxlen = sizeof(int),
680 .mode = 0644,
681 .proc_handler = proc_dointvec
682 },
683 {
684 .procname = "tcp_early_retrans",
685 .data = &sysctl_tcp_early_retrans,
686 .maxlen = sizeof(int),
687 .mode = 0644,
688 .proc_handler = proc_dointvec_minmax,
689 .extra1 = &zero,
690 .extra2 = &four,
691 },
692 {
693 .procname = "tcp_min_tso_segs",
694 .data = &sysctl_tcp_min_tso_segs,
695 .maxlen = sizeof(int),
696 .mode = 0644,
697 .proc_handler = proc_dointvec_minmax,
698 .extra1 = &one,
699 .extra2 = &gso_max_segs,
700 },
701 {
702 .procname = "tcp_pacing_ss_ratio",
703 .data = &sysctl_tcp_pacing_ss_ratio,
704 .maxlen = sizeof(int),
705 .mode = 0644,
706 .proc_handler = proc_dointvec_minmax,
707 .extra1 = &zero,
708 .extra2 = &thousand,
709 },
710 {
711 .procname = "tcp_pacing_ca_ratio",
712 .data = &sysctl_tcp_pacing_ca_ratio,
713 .maxlen = sizeof(int),
714 .mode = 0644,
715 .proc_handler = proc_dointvec_minmax,
716 .extra1 = &zero,
717 .extra2 = &thousand,
718 },
719 {
720 .procname = "tcp_autocorking",
721 .data = &sysctl_tcp_autocorking,
722 .maxlen = sizeof(int),
723 .mode = 0644,
724 .proc_handler = proc_dointvec_minmax,
725 .extra1 = &zero,
726 .extra2 = &one,
727 },
728 {
729 .procname = "tcp_invalid_ratelimit",
730 .data = &sysctl_tcp_invalid_ratelimit,
731 .maxlen = sizeof(int),
732 .mode = 0644,
733 .proc_handler = proc_dointvec_ms_jiffies,
734 },
735 {
736 .procname = "tcp_available_ulp",
737 .maxlen = TCP_ULP_BUF_MAX,
738 .mode = 0444,
739 .proc_handler = proc_tcp_available_ulp,
740 },
741 {
742 .procname = "tcp_default_init_rwnd",
743 .data = &sysctl_tcp_default_init_rwnd,
744 .maxlen = sizeof(int),
745 .mode = 0644,
746 .proc_handler = proc_tcp_default_init_rwnd
747 },
748 {
749 .procname = "icmp_msgs_per_sec",
750 .data = &sysctl_icmp_msgs_per_sec,
751 .maxlen = sizeof(int),
752 .mode = 0644,
753 .proc_handler = proc_dointvec_minmax,
754 .extra1 = &zero,
755 },
756 {
757 .procname = "icmp_msgs_burst",
758 .data = &sysctl_icmp_msgs_burst,
759 .maxlen = sizeof(int),
760 .mode = 0644,
761 .proc_handler = proc_dointvec_minmax,
762 .extra1 = &zero,
763 },
764 {
765 .procname = "udp_mem",
766 .data = &sysctl_udp_mem,
767 .maxlen = sizeof(sysctl_udp_mem),
768 .mode = 0644,
769 .proc_handler = proc_doulongvec_minmax,
770 },
771 {
772 .procname = "udp_rmem_min",
773 .data = &sysctl_udp_rmem_min,
774 .maxlen = sizeof(sysctl_udp_rmem_min),
775 .mode = 0644,
776 .proc_handler = proc_dointvec_minmax,
777 .extra1 = &one
778 },
779 {
780 .procname = "udp_wmem_min",
781 .data = &sysctl_udp_wmem_min,
782 .maxlen = sizeof(sysctl_udp_wmem_min),
783 .mode = 0644,
784 .proc_handler = proc_dointvec_minmax,
785 .extra1 = &one
786 },
787 { }
788 };
789
790 static struct ctl_table ipv4_net_table[] = {
791 {
792 .procname = "icmp_echo_ignore_all",
793 .data = &init_net.ipv4.sysctl_icmp_echo_ignore_all,
794 .maxlen = sizeof(int),
795 .mode = 0644,
796 .proc_handler = proc_dointvec
797 },
798 {
799 .procname = "icmp_echo_ignore_broadcasts",
800 .data = &init_net.ipv4.sysctl_icmp_echo_ignore_broadcasts,
801 .maxlen = sizeof(int),
802 .mode = 0644,
803 .proc_handler = proc_dointvec
804 },
805 {
806 .procname = "icmp_ignore_bogus_error_responses",
807 .data = &init_net.ipv4.sysctl_icmp_ignore_bogus_error_responses,
808 .maxlen = sizeof(int),
809 .mode = 0644,
810 .proc_handler = proc_dointvec
811 },
812 {
813 .procname = "icmp_errors_use_inbound_ifaddr",
814 .data = &init_net.ipv4.sysctl_icmp_errors_use_inbound_ifaddr,
815 .maxlen = sizeof(int),
816 .mode = 0644,
817 .proc_handler = proc_dointvec
818 },
819 {
820 .procname = "icmp_ratelimit",
821 .data = &init_net.ipv4.sysctl_icmp_ratelimit,
822 .maxlen = sizeof(int),
823 .mode = 0644,
824 .proc_handler = proc_dointvec_ms_jiffies,
825 },
826 {
827 .procname = "icmp_ratemask",
828 .data = &init_net.ipv4.sysctl_icmp_ratemask,
829 .maxlen = sizeof(int),
830 .mode = 0644,
831 .proc_handler = proc_dointvec
832 },
833 {
834 .procname = "ping_group_range",
835 .data = &init_net.ipv4.ping_group_range.range,
836 .maxlen = sizeof(gid_t)*2,
837 .mode = 0644,
838 .proc_handler = ipv4_ping_group_range,
839 },
840 {
841 .procname = "tcp_ecn",
842 .data = &init_net.ipv4.sysctl_tcp_ecn,
843 .maxlen = sizeof(int),
844 .mode = 0644,
845 .proc_handler = proc_dointvec
846 },
847 {
848 .procname = "tcp_ecn_fallback",
849 .data = &init_net.ipv4.sysctl_tcp_ecn_fallback,
850 .maxlen = sizeof(int),
851 .mode = 0644,
852 .proc_handler = proc_dointvec
853 },
854 {
855 .procname = "ip_dynaddr",
856 .data = &init_net.ipv4.sysctl_ip_dynaddr,
857 .maxlen = sizeof(int),
858 .mode = 0644,
859 .proc_handler = proc_dointvec
860 },
861 {
862 .procname = "ip_early_demux",
863 .data = &init_net.ipv4.sysctl_ip_early_demux,
864 .maxlen = sizeof(int),
865 .mode = 0644,
866 .proc_handler = proc_dointvec
867 },
868 {
869 .procname = "udp_early_demux",
870 .data = &init_net.ipv4.sysctl_udp_early_demux,
871 .maxlen = sizeof(int),
872 .mode = 0644,
873 .proc_handler = proc_udp_early_demux
874 },
875 {
876 .procname = "tcp_early_demux",
877 .data = &init_net.ipv4.sysctl_tcp_early_demux,
878 .maxlen = sizeof(int),
879 .mode = 0644,
880 .proc_handler = proc_tcp_early_demux
881 },
882 {
883 .procname = "ip_default_ttl",
884 .data = &init_net.ipv4.sysctl_ip_default_ttl,
885 .maxlen = sizeof(int),
886 .mode = 0644,
887 .proc_handler = proc_dointvec_minmax,
888 .extra1 = &ip_ttl_min,
889 .extra2 = &ip_ttl_max,
890 },
891 {
892 .procname = "ip_local_port_range",
893 .maxlen = sizeof(init_net.ipv4.ip_local_ports.range),
894 .data = &init_net.ipv4.ip_local_ports.range,
895 .mode = 0644,
896 .proc_handler = ipv4_local_port_range,
897 },
898 {
899 .procname = "ip_local_reserved_ports",
900 .data = &init_net.ipv4.sysctl_local_reserved_ports,
901 .maxlen = 65536,
902 .mode = 0644,
903 .proc_handler = proc_do_large_bitmap,
904 },
905 {
906 .procname = "ip_no_pmtu_disc",
907 .data = &init_net.ipv4.sysctl_ip_no_pmtu_disc,
908 .maxlen = sizeof(int),
909 .mode = 0644,
910 .proc_handler = proc_dointvec
911 },
912 {
913 .procname = "ip_forward_use_pmtu",
914 .data = &init_net.ipv4.sysctl_ip_fwd_use_pmtu,
915 .maxlen = sizeof(int),
916 .mode = 0644,
917 .proc_handler = proc_dointvec,
918 },
919 {
920 .procname = "ip_nonlocal_bind",
921 .data = &init_net.ipv4.sysctl_ip_nonlocal_bind,
922 .maxlen = sizeof(int),
923 .mode = 0644,
924 .proc_handler = proc_dointvec
925 },
926 {
927 .procname = "fwmark_reflect",
928 .data = &init_net.ipv4.sysctl_fwmark_reflect,
929 .maxlen = sizeof(int),
930 .mode = 0644,
931 .proc_handler = proc_dointvec,
932 },
933 {
934 .procname = "tcp_fwmark_accept",
935 .data = &init_net.ipv4.sysctl_tcp_fwmark_accept,
936 .maxlen = sizeof(int),
937 .mode = 0644,
938 .proc_handler = proc_dointvec,
939 },
940 #ifdef CONFIG_NET_L3_MASTER_DEV
941 {
942 .procname = "tcp_l3mdev_accept",
943 .data = &init_net.ipv4.sysctl_tcp_l3mdev_accept,
944 .maxlen = sizeof(int),
945 .mode = 0644,
946 .proc_handler = proc_dointvec_minmax,
947 .extra1 = &zero,
948 .extra2 = &one,
949 },
950 #endif
951 {
952 .procname = "tcp_mtu_probing",
953 .data = &init_net.ipv4.sysctl_tcp_mtu_probing,
954 .maxlen = sizeof(int),
955 .mode = 0644,
956 .proc_handler = proc_dointvec,
957 },
958 {
959 .procname = "tcp_base_mss",
960 .data = &init_net.ipv4.sysctl_tcp_base_mss,
961 .maxlen = sizeof(int),
962 .mode = 0644,
963 .proc_handler = proc_dointvec,
964 },
965 {
966 .procname = "tcp_probe_threshold",
967 .data = &init_net.ipv4.sysctl_tcp_probe_threshold,
968 .maxlen = sizeof(int),
969 .mode = 0644,
970 .proc_handler = proc_dointvec,
971 },
972 {
973 .procname = "tcp_probe_interval",
974 .data = &init_net.ipv4.sysctl_tcp_probe_interval,
975 .maxlen = sizeof(int),
976 .mode = 0644,
977 .proc_handler = proc_dointvec,
978 },
979 {
980 .procname = "igmp_link_local_mcast_reports",
981 .data = &init_net.ipv4.sysctl_igmp_llm_reports,
982 .maxlen = sizeof(int),
983 .mode = 0644,
984 .proc_handler = proc_dointvec
985 },
986 {
987 .procname = "igmp_max_memberships",
988 .data = &init_net.ipv4.sysctl_igmp_max_memberships,
989 .maxlen = sizeof(int),
990 .mode = 0644,
991 .proc_handler = proc_dointvec
992 },
993 {
994 .procname = "igmp_max_msf",
995 .data = &init_net.ipv4.sysctl_igmp_max_msf,
996 .maxlen = sizeof(int),
997 .mode = 0644,
998 .proc_handler = proc_dointvec
999 },
1000 #ifdef CONFIG_IP_MULTICAST
1001 {
1002 .procname = "igmp_qrv",
1003 .data = &init_net.ipv4.sysctl_igmp_qrv,
1004 .maxlen = sizeof(int),
1005 .mode = 0644,
1006 .proc_handler = proc_dointvec_minmax,
1007 .extra1 = &one
1008 },
1009 #endif
1010 {
1011 .procname = "tcp_keepalive_time",
1012 .data = &init_net.ipv4.sysctl_tcp_keepalive_time,
1013 .maxlen = sizeof(int),
1014 .mode = 0644,
1015 .proc_handler = proc_dointvec_jiffies,
1016 },
1017 {
1018 .procname = "tcp_keepalive_probes",
1019 .data = &init_net.ipv4.sysctl_tcp_keepalive_probes,
1020 .maxlen = sizeof(int),
1021 .mode = 0644,
1022 .proc_handler = proc_dointvec
1023 },
1024 {
1025 .procname = "tcp_keepalive_intvl",
1026 .data = &init_net.ipv4.sysctl_tcp_keepalive_intvl,
1027 .maxlen = sizeof(int),
1028 .mode = 0644,
1029 .proc_handler = proc_dointvec_jiffies,
1030 },
1031 {
1032 .procname = "tcp_syn_retries",
1033 .data = &init_net.ipv4.sysctl_tcp_syn_retries,
1034 .maxlen = sizeof(int),
1035 .mode = 0644,
1036 .proc_handler = proc_dointvec_minmax,
1037 .extra1 = &tcp_syn_retries_min,
1038 .extra2 = &tcp_syn_retries_max
1039 },
1040 {
1041 .procname = "tcp_synack_retries",
1042 .data = &init_net.ipv4.sysctl_tcp_synack_retries,
1043 .maxlen = sizeof(int),
1044 .mode = 0644,
1045 .proc_handler = proc_dointvec
1046 },
1047 #ifdef CONFIG_SYN_COOKIES
1048 {
1049 .procname = "tcp_syncookies",
1050 .data = &init_net.ipv4.sysctl_tcp_syncookies,
1051 .maxlen = sizeof(int),
1052 .mode = 0644,
1053 .proc_handler = proc_dointvec
1054 },
1055 #endif
1056 {
1057 .procname = "tcp_reordering",
1058 .data = &init_net.ipv4.sysctl_tcp_reordering,
1059 .maxlen = sizeof(int),
1060 .mode = 0644,
1061 .proc_handler = proc_dointvec
1062 },
1063 {
1064 .procname = "tcp_retries1",
1065 .data = &init_net.ipv4.sysctl_tcp_retries1,
1066 .maxlen = sizeof(int),
1067 .mode = 0644,
1068 .proc_handler = proc_dointvec_minmax,
1069 .extra2 = &tcp_retr1_max
1070 },
1071 {
1072 .procname = "tcp_retries2",
1073 .data = &init_net.ipv4.sysctl_tcp_retries2,
1074 .maxlen = sizeof(int),
1075 .mode = 0644,
1076 .proc_handler = proc_dointvec
1077 },
1078 {
1079 .procname = "tcp_orphan_retries",
1080 .data = &init_net.ipv4.sysctl_tcp_orphan_retries,
1081 .maxlen = sizeof(int),
1082 .mode = 0644,
1083 .proc_handler = proc_dointvec
1084 },
1085 {
1086 .procname = "tcp_fin_timeout",
1087 .data = &init_net.ipv4.sysctl_tcp_fin_timeout,
1088 .maxlen = sizeof(int),
1089 .mode = 0644,
1090 .proc_handler = proc_dointvec_jiffies,
1091 },
1092 {
1093 .procname = "tcp_notsent_lowat",
1094 .data = &init_net.ipv4.sysctl_tcp_notsent_lowat,
1095 .maxlen = sizeof(unsigned int),
1096 .mode = 0644,
1097 .proc_handler = proc_douintvec,
1098 },
1099 {
1100 .procname = "tcp_tw_reuse",
1101 .data = &init_net.ipv4.sysctl_tcp_tw_reuse,
1102 .maxlen = sizeof(int),
1103 .mode = 0644,
1104 .proc_handler = proc_dointvec
1105 },
1106 {
1107 .procname = "tcp_max_tw_buckets",
1108 .data = &init_net.ipv4.tcp_death_row.sysctl_max_tw_buckets,
1109 .maxlen = sizeof(int),
1110 .mode = 0644,
1111 .proc_handler = proc_dointvec
1112 },
1113 {
1114 .procname = "tcp_max_syn_backlog",
1115 .data = &init_net.ipv4.sysctl_max_syn_backlog,
1116 .maxlen = sizeof(int),
1117 .mode = 0644,
1118 .proc_handler = proc_dointvec
1119 },
1120 #ifdef CONFIG_IP_ROUTE_MULTIPATH
1121 {
1122 .procname = "fib_multipath_use_neigh",
1123 .data = &init_net.ipv4.sysctl_fib_multipath_use_neigh,
1124 .maxlen = sizeof(int),
1125 .mode = 0644,
1126 .proc_handler = proc_dointvec_minmax,
1127 .extra1 = &zero,
1128 .extra2 = &one,
1129 },
1130 {
1131 .procname = "fib_multipath_hash_policy",
1132 .data = &init_net.ipv4.sysctl_fib_multipath_hash_policy,
1133 .maxlen = sizeof(int),
1134 .mode = 0644,
1135 .proc_handler = proc_dointvec_minmax,
1136 .extra1 = &zero,
1137 .extra2 = &one,
1138 },
1139 #endif
1140 {
1141 .procname = "ip_unprivileged_port_start",
1142 .maxlen = sizeof(int),
1143 .data = &init_net.ipv4.sysctl_ip_prot_sock,
1144 .mode = 0644,
1145 .proc_handler = ipv4_privileged_ports,
1146 },
1147 #ifdef CONFIG_NET_L3_MASTER_DEV
1148 {
1149 .procname = "udp_l3mdev_accept",
1150 .data = &init_net.ipv4.sysctl_udp_l3mdev_accept,
1151 .maxlen = sizeof(int),
1152 .mode = 0644,
1153 .proc_handler = proc_dointvec_minmax,
1154 .extra1 = &zero,
1155 .extra2 = &one,
1156 },
1157 #endif
1158 {
1159 .procname = "tcp_sack",
1160 .data = &init_net.ipv4.sysctl_tcp_sack,
1161 .maxlen = sizeof(int),
1162 .mode = 0644,
1163 .proc_handler = proc_dointvec
1164 },
1165 {
1166 .procname = "tcp_window_scaling",
1167 .data = &init_net.ipv4.sysctl_tcp_window_scaling,
1168 .maxlen = sizeof(int),
1169 .mode = 0644,
1170 .proc_handler = proc_dointvec
1171 },
1172 {
1173 .procname = "tcp_timestamps",
1174 .data = &init_net.ipv4.sysctl_tcp_timestamps,
1175 .maxlen = sizeof(int),
1176 .mode = 0644,
1177 .proc_handler = proc_dointvec
1178 },
1179 { }
1180 };
1181
1182 static __net_init int ipv4_sysctl_init_net(struct net *net)
1183 {
1184 struct ctl_table *table;
1185
1186 table = ipv4_net_table;
1187 if (!net_eq(net, &init_net)) {
1188 int i;
1189
1190 table = kmemdup(table, sizeof(ipv4_net_table), GFP_KERNEL);
1191 if (!table)
1192 goto err_alloc;
1193
1194 /* Update the variables to point into the current struct net */
1195 for (i = 0; i < ARRAY_SIZE(ipv4_net_table) - 1; i++)
1196 table[i].data += (void *)net - (void *)&init_net;
1197 }
1198
1199 net->ipv4.ipv4_hdr = register_net_sysctl(net, "net/ipv4", table);
1200 if (!net->ipv4.ipv4_hdr)
1201 goto err_reg;
1202
1203 net->ipv4.sysctl_local_reserved_ports = kzalloc(65536 / 8, GFP_KERNEL);
1204 if (!net->ipv4.sysctl_local_reserved_ports)
1205 goto err_ports;
1206
1207 return 0;
1208
1209 err_ports:
1210 unregister_net_sysctl_table(net->ipv4.ipv4_hdr);
1211 err_reg:
1212 if (!net_eq(net, &init_net))
1213 kfree(table);
1214 err_alloc:
1215 return -ENOMEM;
1216 }
1217
1218 static __net_exit void ipv4_sysctl_exit_net(struct net *net)
1219 {
1220 struct ctl_table *table;
1221
1222 kfree(net->ipv4.sysctl_local_reserved_ports);
1223 table = net->ipv4.ipv4_hdr->ctl_table_arg;
1224 unregister_net_sysctl_table(net->ipv4.ipv4_hdr);
1225 kfree(table);
1226 }
1227
1228 static __net_initdata struct pernet_operations ipv4_sysctl_ops = {
1229 .init = ipv4_sysctl_init_net,
1230 .exit = ipv4_sysctl_exit_net,
1231 };
1232
1233 static __init int sysctl_ipv4_init(void)
1234 {
1235 struct ctl_table_header *hdr;
1236
1237 hdr = register_net_sysctl(&init_net, "net/ipv4", ipv4_table);
1238 if (!hdr)
1239 return -ENOMEM;
1240
1241 if (register_pernet_subsys(&ipv4_sysctl_ops)) {
1242 unregister_net_sysctl_table(hdr);
1243 return -ENOMEM;
1244 }
1245
1246 return 0;
1247 }
1248
1249 __initcall(sysctl_ipv4_init);