Linux kernel mirror (for testing)
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linux
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/sysctl.h>
10#include <linux/seqlock.h>
11#include <linux/init.h>
12#include <linux/slab.h>
13#include <net/icmp.h>
14#include <net/ip.h>
15#include <net/ip_fib.h>
16#include <net/tcp.h>
17#include <net/udp.h>
18#include <net/cipso_ipv4.h>
19#include <net/ping.h>
20#include <net/protocol.h>
21#include <net/netevent.h>
22
23static int tcp_retr1_max = 255;
24static int ip_local_port_range_min[] = { 1, 1 };
25static int ip_local_port_range_max[] = { 65535, 65535 };
26static int tcp_adv_win_scale_min = -31;
27static int tcp_adv_win_scale_max = 31;
28static int tcp_app_win_max = 31;
29static int tcp_min_snd_mss_min = TCP_MIN_SND_MSS;
30static int tcp_min_snd_mss_max = 65535;
31static int tcp_rto_max_max = TCP_RTO_MAX_SEC * MSEC_PER_SEC;
32static int ip_privileged_port_min;
33static int ip_privileged_port_max = 65535;
34static int ip_ttl_min = 1;
35static int ip_ttl_max = 255;
36static int tcp_syn_retries_min = 1;
37static int tcp_syn_retries_max = MAX_TCP_SYNCNT;
38static int tcp_syn_linear_timeouts_max = MAX_TCP_SYNCNT;
39static unsigned long ip_ping_group_range_min[] = { 0, 0 };
40static unsigned long ip_ping_group_range_max[] = { GID_T_MAX, GID_T_MAX };
41static u32 u32_max_div_HZ = UINT_MAX / HZ;
42static int one_day_secs = 24 * 3600;
43static u32 fib_multipath_hash_fields_all_mask __maybe_unused =
44 FIB_MULTIPATH_HASH_FIELD_ALL_MASK;
45static unsigned int tcp_child_ehash_entries_max = 16 * 1024 * 1024;
46static unsigned int udp_child_hash_entries_max = UDP_HTABLE_SIZE_MAX;
47static int tcp_plb_max_rounds = 31;
48static int tcp_plb_max_cong_thresh = 256;
49static unsigned int tcp_tw_reuse_delay_max = TCP_PAWS_MSL * MSEC_PER_SEC;
50static int tcp_ecn_mode_max = 2;
51static u32 icmp_errors_extension_mask_all =
52 GENMASK_U8(ICMP_ERR_EXT_COUNT - 1, 0);
53
54/* obsolete */
55static int sysctl_tcp_low_latency __read_mostly;
56
57/* Update system visible IP port range */
58static void set_local_port_range(struct net *net, unsigned int low, unsigned int high)
59{
60 bool same_parity = !((low ^ high) & 1);
61
62 if (same_parity && !net->ipv4.ip_local_ports.warned) {
63 net->ipv4.ip_local_ports.warned = true;
64 pr_err_ratelimited("ip_local_port_range: prefer different parity for start/end values.\n");
65 }
66 WRITE_ONCE(net->ipv4.ip_local_ports.range, high << 16 | low);
67}
68
69/* Validate changes from /proc interface. */
70static int ipv4_local_port_range(const struct ctl_table *table, int write,
71 void *buffer, size_t *lenp, loff_t *ppos)
72{
73 struct net *net = table->data;
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] < READ_ONCE(net->ipv4.sysctl_ip_prot_sock)))
95 ret = -EINVAL;
96 else
97 set_local_port_range(net, range[0], range[1]);
98 }
99
100 return ret;
101}
102
103/* Validate changes from /proc interface. */
104static int ipv4_privileged_ports(const struct ctl_table *table, int write,
105 void *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 = READ_ONCE(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 WRITE_ONCE(net->ipv4.sysctl_ip_prot_sock, pports);
133 }
134
135 return ret;
136}
137
138static void inet_get_ping_group_range_table(const struct ctl_table *table,
139 kgid_t *low, kgid_t *high)
140{
141 kgid_t *data = table->data;
142 struct net *net =
143 container_of(table->data, struct net, ipv4.ping_group_range.range);
144 unsigned int seq;
145 do {
146 seq = read_seqbegin(&net->ipv4.ping_group_range.lock);
147
148 *low = data[0];
149 *high = data[1];
150 } while (read_seqretry(&net->ipv4.ping_group_range.lock, seq));
151}
152
153/* Update system visible IP port range */
154static void set_ping_group_range(const struct ctl_table *table,
155 kgid_t low, kgid_t high)
156{
157 kgid_t *data = table->data;
158 struct net *net =
159 container_of(table->data, struct net, ipv4.ping_group_range.range);
160 write_seqlock(&net->ipv4.ping_group_range.lock);
161 data[0] = low;
162 data[1] = high;
163 write_sequnlock(&net->ipv4.ping_group_range.lock);
164}
165
166/* Validate changes from /proc interface. */
167static int ipv4_ping_group_range(const struct ctl_table *table, int write,
168 void *buffer, size_t *lenp, loff_t *ppos)
169{
170 struct user_namespace *user_ns = current_user_ns();
171 int ret;
172 unsigned long urange[2];
173 kgid_t low, high;
174 struct ctl_table tmp = {
175 .data = &urange,
176 .maxlen = sizeof(urange),
177 .mode = table->mode,
178 .extra1 = &ip_ping_group_range_min,
179 .extra2 = &ip_ping_group_range_max,
180 };
181
182 inet_get_ping_group_range_table(table, &low, &high);
183 urange[0] = from_kgid_munged(user_ns, low);
184 urange[1] = from_kgid_munged(user_ns, high);
185 ret = proc_doulongvec_minmax(&tmp, write, buffer, lenp, ppos);
186
187 if (write && ret == 0) {
188 low = make_kgid(user_ns, urange[0]);
189 high = make_kgid(user_ns, urange[1]);
190 if (!gid_valid(low) || !gid_valid(high))
191 return -EINVAL;
192 if (urange[1] < urange[0] || gid_lt(high, low)) {
193 low = make_kgid(&init_user_ns, 1);
194 high = make_kgid(&init_user_ns, 0);
195 }
196 set_ping_group_range(table, low, high);
197 }
198
199 return ret;
200}
201
202static int ipv4_fwd_update_priority(const struct ctl_table *table, int write,
203 void *buffer, size_t *lenp, loff_t *ppos)
204{
205 struct net *net;
206 int ret;
207
208 net = container_of(table->data, struct net,
209 ipv4.sysctl_ip_fwd_update_priority);
210 ret = proc_dou8vec_minmax(table, write, buffer, lenp, ppos);
211 if (write && ret == 0)
212 call_netevent_notifiers(NETEVENT_IPV4_FWD_UPDATE_PRIORITY_UPDATE,
213 net);
214
215 return ret;
216}
217
218static int proc_tcp_congestion_control(const struct ctl_table *ctl, int write,
219 void *buffer, size_t *lenp, loff_t *ppos)
220{
221 struct net *net = container_of(ctl->data, struct net,
222 ipv4.tcp_congestion_control);
223 char val[TCP_CA_NAME_MAX];
224 struct ctl_table tbl = {
225 .data = val,
226 .maxlen = TCP_CA_NAME_MAX,
227 };
228 int ret;
229
230 tcp_get_default_congestion_control(net, val);
231
232 ret = proc_dostring(&tbl, write, buffer, lenp, ppos);
233 if (write && ret == 0)
234 ret = tcp_set_default_congestion_control(net, val);
235 return ret;
236}
237
238static int proc_tcp_available_congestion_control(const struct ctl_table *ctl,
239 int write, void *buffer,
240 size_t *lenp, loff_t *ppos)
241{
242 struct ctl_table tbl = { .maxlen = TCP_CA_BUF_MAX, };
243 int ret;
244
245 tbl.data = kmalloc(tbl.maxlen, GFP_USER);
246 if (!tbl.data)
247 return -ENOMEM;
248 tcp_get_available_congestion_control(tbl.data, TCP_CA_BUF_MAX);
249 ret = proc_dostring(&tbl, write, buffer, lenp, ppos);
250 kfree(tbl.data);
251 return ret;
252}
253
254static int proc_allowed_congestion_control(const struct ctl_table *ctl,
255 int write, void *buffer,
256 size_t *lenp, loff_t *ppos)
257{
258 struct ctl_table tbl = { .maxlen = TCP_CA_BUF_MAX };
259 int ret;
260
261 tbl.data = kmalloc(tbl.maxlen, GFP_USER);
262 if (!tbl.data)
263 return -ENOMEM;
264
265 tcp_get_allowed_congestion_control(tbl.data, tbl.maxlen);
266 ret = proc_dostring(&tbl, write, buffer, lenp, ppos);
267 if (write && ret == 0)
268 ret = tcp_set_allowed_congestion_control(tbl.data);
269 kfree(tbl.data);
270 return ret;
271}
272
273static int sscanf_key(char *buf, __le32 *key)
274{
275 u32 user_key[4];
276 int i, ret = 0;
277
278 if (sscanf(buf, "%x-%x-%x-%x", user_key, user_key + 1,
279 user_key + 2, user_key + 3) != 4) {
280 ret = -EINVAL;
281 } else {
282 for (i = 0; i < ARRAY_SIZE(user_key); i++)
283 key[i] = cpu_to_le32(user_key[i]);
284 }
285 pr_debug("proc TFO key set 0x%x-%x-%x-%x <- 0x%s: %u\n",
286 user_key[0], user_key[1], user_key[2], user_key[3], buf, ret);
287
288 return ret;
289}
290
291static int proc_tcp_fastopen_key(const struct ctl_table *table, int write,
292 void *buffer, size_t *lenp, loff_t *ppos)
293{
294 struct net *net = container_of(table->data, struct net,
295 ipv4.sysctl_tcp_fastopen);
296 /* maxlen to print the list of keys in hex (*2), with dashes
297 * separating doublewords and a comma in between keys.
298 */
299 struct ctl_table tbl = { .maxlen = ((TCP_FASTOPEN_KEY_LENGTH *
300 2 * TCP_FASTOPEN_KEY_MAX) +
301 (TCP_FASTOPEN_KEY_MAX * 5)) };
302 u32 user_key[TCP_FASTOPEN_KEY_BUF_LENGTH / sizeof(u32)];
303 __le32 key[TCP_FASTOPEN_KEY_BUF_LENGTH / sizeof(__le32)];
304 char *backup_data;
305 int ret, i = 0, off = 0, n_keys;
306
307 tbl.data = kmalloc(tbl.maxlen, GFP_KERNEL);
308 if (!tbl.data)
309 return -ENOMEM;
310
311 n_keys = tcp_fastopen_get_cipher(net, NULL, (u64 *)key);
312 if (!n_keys) {
313 memset(&key[0], 0, TCP_FASTOPEN_KEY_LENGTH);
314 n_keys = 1;
315 }
316
317 for (i = 0; i < n_keys * 4; i++)
318 user_key[i] = le32_to_cpu(key[i]);
319
320 for (i = 0; i < n_keys; i++) {
321 off += snprintf(tbl.data + off, tbl.maxlen - off,
322 "%08x-%08x-%08x-%08x",
323 user_key[i * 4],
324 user_key[i * 4 + 1],
325 user_key[i * 4 + 2],
326 user_key[i * 4 + 3]);
327
328 if (WARN_ON_ONCE(off >= tbl.maxlen - 1))
329 break;
330
331 if (i + 1 < n_keys)
332 off += snprintf(tbl.data + off, tbl.maxlen - off, ",");
333 }
334
335 ret = proc_dostring(&tbl, write, buffer, lenp, ppos);
336
337 if (write && ret == 0) {
338 backup_data = strchr(tbl.data, ',');
339 if (backup_data) {
340 *backup_data = '\0';
341 backup_data++;
342 }
343 if (sscanf_key(tbl.data, key)) {
344 ret = -EINVAL;
345 goto bad_key;
346 }
347 if (backup_data) {
348 if (sscanf_key(backup_data, key + 4)) {
349 ret = -EINVAL;
350 goto bad_key;
351 }
352 }
353 tcp_fastopen_reset_cipher(net, NULL, key,
354 backup_data ? key + 4 : NULL);
355 }
356
357bad_key:
358 kfree(tbl.data);
359 return ret;
360}
361
362static int proc_tfo_blackhole_detect_timeout(const struct ctl_table *table,
363 int write, void *buffer,
364 size_t *lenp, loff_t *ppos)
365{
366 struct net *net = container_of(table->data, struct net,
367 ipv4.sysctl_tcp_fastopen_blackhole_timeout);
368 int ret;
369
370 ret = proc_dointvec_minmax(table, write, buffer, lenp, ppos);
371 if (write && ret == 0)
372 atomic_set(&net->ipv4.tfo_active_disable_times, 0);
373
374 return ret;
375}
376
377static int proc_tcp_available_ulp(const struct ctl_table *ctl,
378 int write, void *buffer, size_t *lenp,
379 loff_t *ppos)
380{
381 struct ctl_table tbl = { .maxlen = TCP_ULP_BUF_MAX, };
382 int ret;
383
384 tbl.data = kmalloc(tbl.maxlen, GFP_USER);
385 if (!tbl.data)
386 return -ENOMEM;
387 tcp_get_available_ulp(tbl.data, TCP_ULP_BUF_MAX);
388 ret = proc_dostring(&tbl, write, buffer, lenp, ppos);
389 kfree(tbl.data);
390
391 return ret;
392}
393
394static int proc_tcp_ehash_entries(const struct ctl_table *table, int write,
395 void *buffer, size_t *lenp, loff_t *ppos)
396{
397 struct net *net = container_of(table->data, struct net,
398 ipv4.sysctl_tcp_child_ehash_entries);
399 struct inet_hashinfo *hinfo = net->ipv4.tcp_death_row.hashinfo;
400 int tcp_ehash_entries;
401 struct ctl_table tbl;
402
403 tcp_ehash_entries = hinfo->ehash_mask + 1;
404
405 /* A negative number indicates that the child netns
406 * shares the global ehash.
407 */
408 if (!net_eq(net, &init_net) && !hinfo->pernet)
409 tcp_ehash_entries *= -1;
410
411 memset(&tbl, 0, sizeof(tbl));
412 tbl.data = &tcp_ehash_entries;
413 tbl.maxlen = sizeof(int);
414
415 return proc_dointvec(&tbl, write, buffer, lenp, ppos);
416}
417
418static int proc_udp_hash_entries(const struct ctl_table *table, int write,
419 void *buffer, size_t *lenp, loff_t *ppos)
420{
421 struct net *net = container_of(table->data, struct net,
422 ipv4.sysctl_udp_child_hash_entries);
423 int udp_hash_entries;
424 struct ctl_table tbl;
425
426 udp_hash_entries = net->ipv4.udp_table->mask + 1;
427
428 /* A negative number indicates that the child netns
429 * shares the global udp_table.
430 */
431 if (!net_eq(net, &init_net) && net->ipv4.udp_table == &udp_table)
432 udp_hash_entries *= -1;
433
434 memset(&tbl, 0, sizeof(tbl));
435 tbl.data = &udp_hash_entries;
436 tbl.maxlen = sizeof(int);
437
438 return proc_dointvec(&tbl, write, buffer, lenp, ppos);
439}
440
441#ifdef CONFIG_IP_ROUTE_MULTIPATH
442static int proc_fib_multipath_hash_policy(const struct ctl_table *table, int write,
443 void *buffer, size_t *lenp,
444 loff_t *ppos)
445{
446 struct net *net = container_of(table->data, struct net,
447 ipv4.sysctl_fib_multipath_hash_policy);
448 int ret;
449
450 ret = proc_dou8vec_minmax(table, write, buffer, lenp, ppos);
451 if (write && ret == 0)
452 call_netevent_notifiers(NETEVENT_IPV4_MPATH_HASH_UPDATE, net);
453
454 return ret;
455}
456
457static int proc_fib_multipath_hash_fields(const struct ctl_table *table, int write,
458 void *buffer, size_t *lenp,
459 loff_t *ppos)
460{
461 struct net *net;
462 int ret;
463
464 net = container_of(table->data, struct net,
465 ipv4.sysctl_fib_multipath_hash_fields);
466 ret = proc_douintvec_minmax(table, write, buffer, lenp, ppos);
467 if (write && ret == 0)
468 call_netevent_notifiers(NETEVENT_IPV4_MPATH_HASH_UPDATE, net);
469
470 return ret;
471}
472
473static u32 proc_fib_multipath_hash_rand_seed __ro_after_init;
474
475static void proc_fib_multipath_hash_init_rand_seed(void)
476{
477 get_random_bytes(&proc_fib_multipath_hash_rand_seed,
478 sizeof(proc_fib_multipath_hash_rand_seed));
479}
480
481static void proc_fib_multipath_hash_set_seed(struct net *net, u32 user_seed)
482{
483 struct sysctl_fib_multipath_hash_seed new = {
484 .user_seed = user_seed,
485 .mp_seed = (user_seed ? user_seed :
486 proc_fib_multipath_hash_rand_seed),
487 };
488
489 WRITE_ONCE(net->ipv4.sysctl_fib_multipath_hash_seed, new);
490}
491
492static int proc_fib_multipath_hash_seed(const struct ctl_table *table, int write,
493 void *buffer, size_t *lenp,
494 loff_t *ppos)
495{
496 struct sysctl_fib_multipath_hash_seed *mphs;
497 struct net *net = table->data;
498 struct ctl_table tmp;
499 u32 user_seed;
500 int ret;
501
502 mphs = &net->ipv4.sysctl_fib_multipath_hash_seed;
503 user_seed = mphs->user_seed;
504
505 tmp = *table;
506 tmp.data = &user_seed;
507
508 ret = proc_douintvec_minmax(&tmp, write, buffer, lenp, ppos);
509
510 if (write && ret == 0) {
511 proc_fib_multipath_hash_set_seed(net, user_seed);
512 call_netevent_notifiers(NETEVENT_IPV4_MPATH_HASH_UPDATE, net);
513 }
514
515 return ret;
516}
517#else
518
519static void proc_fib_multipath_hash_init_rand_seed(void)
520{
521}
522
523static void proc_fib_multipath_hash_set_seed(struct net *net, u32 user_seed)
524{
525}
526
527#endif
528
529static struct ctl_table ipv4_table[] = {
530 {
531 .procname = "tcp_max_orphans",
532 .data = &sysctl_tcp_max_orphans,
533 .maxlen = sizeof(int),
534 .mode = 0644,
535 .proc_handler = proc_dointvec
536 },
537 {
538 .procname = "inet_peer_threshold",
539 .data = &inet_peer_threshold,
540 .maxlen = sizeof(int),
541 .mode = 0644,
542 .proc_handler = proc_dointvec
543 },
544 {
545 .procname = "inet_peer_minttl",
546 .data = &inet_peer_minttl,
547 .maxlen = sizeof(int),
548 .mode = 0644,
549 .proc_handler = proc_dointvec_jiffies,
550 },
551 {
552 .procname = "inet_peer_maxttl",
553 .data = &inet_peer_maxttl,
554 .maxlen = sizeof(int),
555 .mode = 0644,
556 .proc_handler = proc_dointvec_jiffies,
557 },
558 {
559 .procname = "tcp_mem",
560 .maxlen = sizeof(sysctl_tcp_mem),
561 .data = &sysctl_tcp_mem,
562 .mode = 0644,
563 .proc_handler = proc_doulongvec_minmax,
564 },
565 {
566 .procname = "tcp_low_latency",
567 .data = &sysctl_tcp_low_latency,
568 .maxlen = sizeof(int),
569 .mode = 0644,
570 .proc_handler = proc_dointvec
571 },
572#ifdef CONFIG_NETLABEL
573 {
574 .procname = "cipso_cache_enable",
575 .data = &cipso_v4_cache_enabled,
576 .maxlen = sizeof(int),
577 .mode = 0644,
578 .proc_handler = proc_dointvec,
579 },
580 {
581 .procname = "cipso_cache_bucket_size",
582 .data = &cipso_v4_cache_bucketsize,
583 .maxlen = sizeof(int),
584 .mode = 0644,
585 .proc_handler = proc_dointvec,
586 },
587 {
588 .procname = "cipso_rbm_optfmt",
589 .data = &cipso_v4_rbm_optfmt,
590 .maxlen = sizeof(int),
591 .mode = 0644,
592 .proc_handler = proc_dointvec,
593 },
594 {
595 .procname = "cipso_rbm_strictvalid",
596 .data = &cipso_v4_rbm_strictvalid,
597 .maxlen = sizeof(int),
598 .mode = 0644,
599 .proc_handler = proc_dointvec,
600 },
601#endif /* CONFIG_NETLABEL */
602 {
603 .procname = "tcp_available_ulp",
604 .maxlen = TCP_ULP_BUF_MAX,
605 .mode = 0444,
606 .proc_handler = proc_tcp_available_ulp,
607 },
608 {
609 .procname = "udp_mem",
610 .data = &sysctl_udp_mem,
611 .maxlen = sizeof(sysctl_udp_mem),
612 .mode = 0644,
613 .proc_handler = proc_doulongvec_minmax,
614 },
615 {
616 .procname = "fib_sync_mem",
617 .data = &sysctl_fib_sync_mem,
618 .maxlen = sizeof(sysctl_fib_sync_mem),
619 .mode = 0644,
620 .proc_handler = proc_douintvec_minmax,
621 .extra1 = &sysctl_fib_sync_mem_min,
622 .extra2 = &sysctl_fib_sync_mem_max,
623 },
624};
625
626static struct ctl_table ipv4_net_table[] = {
627 {
628 .procname = "tcp_max_tw_buckets",
629 .data = &init_net.ipv4.tcp_death_row.sysctl_max_tw_buckets,
630 .maxlen = sizeof(int),
631 .mode = 0644,
632 .proc_handler = proc_dointvec
633 },
634 {
635 .procname = "icmp_echo_ignore_all",
636 .data = &init_net.ipv4.sysctl_icmp_echo_ignore_all,
637 .maxlen = sizeof(u8),
638 .mode = 0644,
639 .proc_handler = proc_dou8vec_minmax,
640 .extra1 = SYSCTL_ZERO,
641 .extra2 = SYSCTL_ONE
642 },
643 {
644 .procname = "icmp_echo_enable_probe",
645 .data = &init_net.ipv4.sysctl_icmp_echo_enable_probe,
646 .maxlen = sizeof(u8),
647 .mode = 0644,
648 .proc_handler = proc_dou8vec_minmax,
649 .extra1 = SYSCTL_ZERO,
650 .extra2 = SYSCTL_ONE
651 },
652 {
653 .procname = "icmp_echo_ignore_broadcasts",
654 .data = &init_net.ipv4.sysctl_icmp_echo_ignore_broadcasts,
655 .maxlen = sizeof(u8),
656 .mode = 0644,
657 .proc_handler = proc_dou8vec_minmax,
658 .extra1 = SYSCTL_ZERO,
659 .extra2 = SYSCTL_ONE
660 },
661 {
662 .procname = "icmp_ignore_bogus_error_responses",
663 .data = &init_net.ipv4.sysctl_icmp_ignore_bogus_error_responses,
664 .maxlen = sizeof(u8),
665 .mode = 0644,
666 .proc_handler = proc_dou8vec_minmax,
667 .extra1 = SYSCTL_ZERO,
668 .extra2 = SYSCTL_ONE
669 },
670 {
671 .procname = "icmp_errors_use_inbound_ifaddr",
672 .data = &init_net.ipv4.sysctl_icmp_errors_use_inbound_ifaddr,
673 .maxlen = sizeof(u8),
674 .mode = 0644,
675 .proc_handler = proc_dou8vec_minmax,
676 .extra1 = SYSCTL_ZERO,
677 .extra2 = SYSCTL_ONE
678 },
679 {
680 .procname = "icmp_errors_extension_mask",
681 .data = &init_net.ipv4.sysctl_icmp_errors_extension_mask,
682 .maxlen = sizeof(u8),
683 .mode = 0644,
684 .proc_handler = proc_dou8vec_minmax,
685 .extra1 = SYSCTL_ZERO,
686 .extra2 = &icmp_errors_extension_mask_all,
687 },
688 {
689 .procname = "icmp_ratelimit",
690 .data = &init_net.ipv4.sysctl_icmp_ratelimit,
691 .maxlen = sizeof(int),
692 .mode = 0644,
693 .proc_handler = proc_dointvec_ms_jiffies,
694 },
695 {
696 .procname = "icmp_ratemask",
697 .data = &init_net.ipv4.sysctl_icmp_ratemask,
698 .maxlen = sizeof(int),
699 .mode = 0644,
700 .proc_handler = proc_dointvec
701 },
702 {
703 .procname = "icmp_msgs_per_sec",
704 .data = &init_net.ipv4.sysctl_icmp_msgs_per_sec,
705 .maxlen = sizeof(int),
706 .mode = 0644,
707 .proc_handler = proc_dointvec_minmax,
708 .extra1 = SYSCTL_ZERO,
709 },
710 {
711 .procname = "icmp_msgs_burst",
712 .data = &init_net.ipv4.sysctl_icmp_msgs_burst,
713 .maxlen = sizeof(int),
714 .mode = 0644,
715 .proc_handler = proc_dointvec_minmax,
716 .extra1 = SYSCTL_ZERO,
717 },
718 {
719 .procname = "ping_group_range",
720 .data = &init_net.ipv4.ping_group_range.range,
721 .maxlen = sizeof(gid_t)*2,
722 .mode = 0644,
723 .proc_handler = ipv4_ping_group_range,
724 },
725#ifdef CONFIG_NET_L3_MASTER_DEV
726 {
727 .procname = "raw_l3mdev_accept",
728 .data = &init_net.ipv4.sysctl_raw_l3mdev_accept,
729 .maxlen = sizeof(u8),
730 .mode = 0644,
731 .proc_handler = proc_dou8vec_minmax,
732 .extra1 = SYSCTL_ZERO,
733 .extra2 = SYSCTL_ONE,
734 },
735#endif
736 {
737 .procname = "tcp_ecn",
738 .data = &init_net.ipv4.sysctl_tcp_ecn,
739 .maxlen = sizeof(u8),
740 .mode = 0644,
741 .proc_handler = proc_dou8vec_minmax,
742 .extra1 = SYSCTL_ZERO,
743 .extra2 = &tcp_ecn_mode_max,
744 },
745 {
746 .procname = "tcp_ecn_option",
747 .data = &init_net.ipv4.sysctl_tcp_ecn_option,
748 .maxlen = sizeof(u8),
749 .mode = 0644,
750 .proc_handler = proc_dou8vec_minmax,
751 .extra1 = SYSCTL_ZERO,
752 .extra2 = SYSCTL_TWO,
753 },
754 {
755 .procname = "tcp_ecn_option_beacon",
756 .data = &init_net.ipv4.sysctl_tcp_ecn_option_beacon,
757 .maxlen = sizeof(u8),
758 .mode = 0644,
759 .proc_handler = proc_dou8vec_minmax,
760 .extra1 = SYSCTL_ZERO,
761 .extra2 = SYSCTL_THREE,
762 },
763 {
764 .procname = "tcp_ecn_fallback",
765 .data = &init_net.ipv4.sysctl_tcp_ecn_fallback,
766 .maxlen = sizeof(u8),
767 .mode = 0644,
768 .proc_handler = proc_dou8vec_minmax,
769 .extra1 = SYSCTL_ZERO,
770 .extra2 = SYSCTL_ONE,
771 },
772 {
773 .procname = "ip_dynaddr",
774 .data = &init_net.ipv4.sysctl_ip_dynaddr,
775 .maxlen = sizeof(u8),
776 .mode = 0644,
777 .proc_handler = proc_dou8vec_minmax,
778 },
779 {
780 .procname = "ip_early_demux",
781 .data = &init_net.ipv4.sysctl_ip_early_demux,
782 .maxlen = sizeof(u8),
783 .mode = 0644,
784 .proc_handler = proc_dou8vec_minmax,
785 },
786 {
787 .procname = "udp_early_demux",
788 .data = &init_net.ipv4.sysctl_udp_early_demux,
789 .maxlen = sizeof(u8),
790 .mode = 0644,
791 .proc_handler = proc_dou8vec_minmax,
792 },
793 {
794 .procname = "tcp_early_demux",
795 .data = &init_net.ipv4.sysctl_tcp_early_demux,
796 .maxlen = sizeof(u8),
797 .mode = 0644,
798 .proc_handler = proc_dou8vec_minmax,
799 },
800 {
801 .procname = "nexthop_compat_mode",
802 .data = &init_net.ipv4.sysctl_nexthop_compat_mode,
803 .maxlen = sizeof(u8),
804 .mode = 0644,
805 .proc_handler = proc_dou8vec_minmax,
806 .extra1 = SYSCTL_ZERO,
807 .extra2 = SYSCTL_ONE,
808 },
809 {
810 .procname = "ip_default_ttl",
811 .data = &init_net.ipv4.sysctl_ip_default_ttl,
812 .maxlen = sizeof(u8),
813 .mode = 0644,
814 .proc_handler = proc_dou8vec_minmax,
815 .extra1 = &ip_ttl_min,
816 .extra2 = &ip_ttl_max,
817 },
818 {
819 .procname = "ip_local_port_range",
820 .maxlen = 0,
821 .data = &init_net,
822 .mode = 0644,
823 .proc_handler = ipv4_local_port_range,
824 },
825 {
826 .procname = "ip_local_reserved_ports",
827 .data = &init_net.ipv4.sysctl_local_reserved_ports,
828 .maxlen = 65536,
829 .mode = 0644,
830 .proc_handler = proc_do_large_bitmap,
831 },
832 {
833 .procname = "ip_no_pmtu_disc",
834 .data = &init_net.ipv4.sysctl_ip_no_pmtu_disc,
835 .maxlen = sizeof(u8),
836 .mode = 0644,
837 .proc_handler = proc_dou8vec_minmax,
838 },
839 {
840 .procname = "ip_forward_use_pmtu",
841 .data = &init_net.ipv4.sysctl_ip_fwd_use_pmtu,
842 .maxlen = sizeof(u8),
843 .mode = 0644,
844 .proc_handler = proc_dou8vec_minmax,
845 },
846 {
847 .procname = "ip_forward_update_priority",
848 .data = &init_net.ipv4.sysctl_ip_fwd_update_priority,
849 .maxlen = sizeof(u8),
850 .mode = 0644,
851 .proc_handler = ipv4_fwd_update_priority,
852 .extra1 = SYSCTL_ZERO,
853 .extra2 = SYSCTL_ONE,
854 },
855 {
856 .procname = "ip_nonlocal_bind",
857 .data = &init_net.ipv4.sysctl_ip_nonlocal_bind,
858 .maxlen = sizeof(u8),
859 .mode = 0644,
860 .proc_handler = proc_dou8vec_minmax,
861 },
862 {
863 .procname = "ip_autobind_reuse",
864 .data = &init_net.ipv4.sysctl_ip_autobind_reuse,
865 .maxlen = sizeof(u8),
866 .mode = 0644,
867 .proc_handler = proc_dou8vec_minmax,
868 .extra1 = SYSCTL_ZERO,
869 .extra2 = SYSCTL_ONE,
870 },
871 {
872 .procname = "fwmark_reflect",
873 .data = &init_net.ipv4.sysctl_fwmark_reflect,
874 .maxlen = sizeof(u8),
875 .mode = 0644,
876 .proc_handler = proc_dou8vec_minmax,
877 },
878 {
879 .procname = "tcp_fwmark_accept",
880 .data = &init_net.ipv4.sysctl_tcp_fwmark_accept,
881 .maxlen = sizeof(u8),
882 .mode = 0644,
883 .proc_handler = proc_dou8vec_minmax,
884 },
885#ifdef CONFIG_NET_L3_MASTER_DEV
886 {
887 .procname = "tcp_l3mdev_accept",
888 .data = &init_net.ipv4.sysctl_tcp_l3mdev_accept,
889 .maxlen = sizeof(u8),
890 .mode = 0644,
891 .proc_handler = proc_dou8vec_minmax,
892 .extra1 = SYSCTL_ZERO,
893 .extra2 = SYSCTL_ONE,
894 },
895#endif
896 {
897 .procname = "tcp_mtu_probing",
898 .data = &init_net.ipv4.sysctl_tcp_mtu_probing,
899 .maxlen = sizeof(u8),
900 .mode = 0644,
901 .proc_handler = proc_dou8vec_minmax,
902 },
903 {
904 .procname = "tcp_base_mss",
905 .data = &init_net.ipv4.sysctl_tcp_base_mss,
906 .maxlen = sizeof(int),
907 .mode = 0644,
908 .proc_handler = proc_dointvec,
909 },
910 {
911 .procname = "tcp_min_snd_mss",
912 .data = &init_net.ipv4.sysctl_tcp_min_snd_mss,
913 .maxlen = sizeof(int),
914 .mode = 0644,
915 .proc_handler = proc_dointvec_minmax,
916 .extra1 = &tcp_min_snd_mss_min,
917 .extra2 = &tcp_min_snd_mss_max,
918 },
919 {
920 .procname = "tcp_mtu_probe_floor",
921 .data = &init_net.ipv4.sysctl_tcp_mtu_probe_floor,
922 .maxlen = sizeof(int),
923 .mode = 0644,
924 .proc_handler = proc_dointvec_minmax,
925 .extra1 = &tcp_min_snd_mss_min,
926 .extra2 = &tcp_min_snd_mss_max,
927 },
928 {
929 .procname = "tcp_probe_threshold",
930 .data = &init_net.ipv4.sysctl_tcp_probe_threshold,
931 .maxlen = sizeof(int),
932 .mode = 0644,
933 .proc_handler = proc_dointvec,
934 },
935 {
936 .procname = "tcp_probe_interval",
937 .data = &init_net.ipv4.sysctl_tcp_probe_interval,
938 .maxlen = sizeof(u32),
939 .mode = 0644,
940 .proc_handler = proc_douintvec_minmax,
941 .extra2 = &u32_max_div_HZ,
942 },
943 {
944 .procname = "igmp_link_local_mcast_reports",
945 .data = &init_net.ipv4.sysctl_igmp_llm_reports,
946 .maxlen = sizeof(u8),
947 .mode = 0644,
948 .proc_handler = proc_dou8vec_minmax,
949 },
950 {
951 .procname = "igmp_max_memberships",
952 .data = &init_net.ipv4.sysctl_igmp_max_memberships,
953 .maxlen = sizeof(int),
954 .mode = 0644,
955 .proc_handler = proc_dointvec
956 },
957 {
958 .procname = "igmp_max_msf",
959 .data = &init_net.ipv4.sysctl_igmp_max_msf,
960 .maxlen = sizeof(int),
961 .mode = 0644,
962 .proc_handler = proc_dointvec
963 },
964#ifdef CONFIG_IP_MULTICAST
965 {
966 .procname = "igmp_qrv",
967 .data = &init_net.ipv4.sysctl_igmp_qrv,
968 .maxlen = sizeof(int),
969 .mode = 0644,
970 .proc_handler = proc_dointvec_minmax,
971 .extra1 = SYSCTL_ONE
972 },
973#endif
974 {
975 .procname = "tcp_congestion_control",
976 .data = &init_net.ipv4.tcp_congestion_control,
977 .mode = 0644,
978 .maxlen = TCP_CA_NAME_MAX,
979 .proc_handler = proc_tcp_congestion_control,
980 },
981 {
982 .procname = "tcp_available_congestion_control",
983 .maxlen = TCP_CA_BUF_MAX,
984 .mode = 0444,
985 .proc_handler = proc_tcp_available_congestion_control,
986 },
987 {
988 .procname = "tcp_allowed_congestion_control",
989 .maxlen = TCP_CA_BUF_MAX,
990 .mode = 0644,
991 .proc_handler = proc_allowed_congestion_control,
992 },
993 {
994 .procname = "tcp_keepalive_time",
995 .data = &init_net.ipv4.sysctl_tcp_keepalive_time,
996 .maxlen = sizeof(int),
997 .mode = 0644,
998 .proc_handler = proc_dointvec_jiffies,
999 },
1000 {
1001 .procname = "tcp_keepalive_probes",
1002 .data = &init_net.ipv4.sysctl_tcp_keepalive_probes,
1003 .maxlen = sizeof(u8),
1004 .mode = 0644,
1005 .proc_handler = proc_dou8vec_minmax,
1006 },
1007 {
1008 .procname = "tcp_keepalive_intvl",
1009 .data = &init_net.ipv4.sysctl_tcp_keepalive_intvl,
1010 .maxlen = sizeof(int),
1011 .mode = 0644,
1012 .proc_handler = proc_dointvec_jiffies,
1013 },
1014 {
1015 .procname = "tcp_syn_retries",
1016 .data = &init_net.ipv4.sysctl_tcp_syn_retries,
1017 .maxlen = sizeof(u8),
1018 .mode = 0644,
1019 .proc_handler = proc_dou8vec_minmax,
1020 .extra1 = &tcp_syn_retries_min,
1021 .extra2 = &tcp_syn_retries_max
1022 },
1023 {
1024 .procname = "tcp_synack_retries",
1025 .data = &init_net.ipv4.sysctl_tcp_synack_retries,
1026 .maxlen = sizeof(u8),
1027 .mode = 0644,
1028 .proc_handler = proc_dou8vec_minmax,
1029 },
1030#ifdef CONFIG_SYN_COOKIES
1031 {
1032 .procname = "tcp_syncookies",
1033 .data = &init_net.ipv4.sysctl_tcp_syncookies,
1034 .maxlen = sizeof(u8),
1035 .mode = 0644,
1036 .proc_handler = proc_dou8vec_minmax,
1037 },
1038#endif
1039 {
1040 .procname = "tcp_migrate_req",
1041 .data = &init_net.ipv4.sysctl_tcp_migrate_req,
1042 .maxlen = sizeof(u8),
1043 .mode = 0644,
1044 .proc_handler = proc_dou8vec_minmax,
1045 .extra1 = SYSCTL_ZERO,
1046 .extra2 = SYSCTL_ONE
1047 },
1048 {
1049 .procname = "tcp_reordering",
1050 .data = &init_net.ipv4.sysctl_tcp_reordering,
1051 .maxlen = sizeof(int),
1052 .mode = 0644,
1053 .proc_handler = proc_dointvec
1054 },
1055 {
1056 .procname = "tcp_retries1",
1057 .data = &init_net.ipv4.sysctl_tcp_retries1,
1058 .maxlen = sizeof(u8),
1059 .mode = 0644,
1060 .proc_handler = proc_dou8vec_minmax,
1061 .extra2 = &tcp_retr1_max
1062 },
1063 {
1064 .procname = "tcp_retries2",
1065 .data = &init_net.ipv4.sysctl_tcp_retries2,
1066 .maxlen = sizeof(u8),
1067 .mode = 0644,
1068 .proc_handler = proc_dou8vec_minmax,
1069 },
1070 {
1071 .procname = "tcp_orphan_retries",
1072 .data = &init_net.ipv4.sysctl_tcp_orphan_retries,
1073 .maxlen = sizeof(u8),
1074 .mode = 0644,
1075 .proc_handler = proc_dou8vec_minmax,
1076 },
1077 {
1078 .procname = "tcp_fin_timeout",
1079 .data = &init_net.ipv4.sysctl_tcp_fin_timeout,
1080 .maxlen = sizeof(int),
1081 .mode = 0644,
1082 .proc_handler = proc_dointvec_jiffies,
1083 },
1084 {
1085 .procname = "tcp_notsent_lowat",
1086 .data = &init_net.ipv4.sysctl_tcp_notsent_lowat,
1087 .maxlen = sizeof(unsigned int),
1088 .mode = 0644,
1089 .proc_handler = proc_douintvec,
1090 },
1091 {
1092 .procname = "tcp_tw_reuse",
1093 .data = &init_net.ipv4.sysctl_tcp_tw_reuse,
1094 .maxlen = sizeof(u8),
1095 .mode = 0644,
1096 .proc_handler = proc_dou8vec_minmax,
1097 .extra1 = SYSCTL_ZERO,
1098 .extra2 = SYSCTL_TWO,
1099 },
1100 {
1101 .procname = "tcp_tw_reuse_delay",
1102 .data = &init_net.ipv4.sysctl_tcp_tw_reuse_delay,
1103 .maxlen = sizeof(unsigned int),
1104 .mode = 0644,
1105 .proc_handler = proc_douintvec_minmax,
1106 .extra1 = SYSCTL_ONE,
1107 .extra2 = &tcp_tw_reuse_delay_max,
1108 },
1109 {
1110 .procname = "tcp_max_syn_backlog",
1111 .data = &init_net.ipv4.sysctl_max_syn_backlog,
1112 .maxlen = sizeof(int),
1113 .mode = 0644,
1114 .proc_handler = proc_dointvec
1115 },
1116 {
1117 .procname = "tcp_fastopen",
1118 .data = &init_net.ipv4.sysctl_tcp_fastopen,
1119 .maxlen = sizeof(int),
1120 .mode = 0644,
1121 .proc_handler = proc_dointvec,
1122 },
1123 {
1124 .procname = "tcp_fastopen_key",
1125 .mode = 0600,
1126 .data = &init_net.ipv4.sysctl_tcp_fastopen,
1127 /* maxlen to print the list of keys in hex (*2), with dashes
1128 * separating doublewords and a comma in between keys.
1129 */
1130 .maxlen = ((TCP_FASTOPEN_KEY_LENGTH *
1131 2 * TCP_FASTOPEN_KEY_MAX) +
1132 (TCP_FASTOPEN_KEY_MAX * 5)),
1133 .proc_handler = proc_tcp_fastopen_key,
1134 },
1135 {
1136 .procname = "tcp_fastopen_blackhole_timeout_sec",
1137 .data = &init_net.ipv4.sysctl_tcp_fastopen_blackhole_timeout,
1138 .maxlen = sizeof(int),
1139 .mode = 0644,
1140 .proc_handler = proc_tfo_blackhole_detect_timeout,
1141 .extra1 = SYSCTL_ZERO,
1142 },
1143#ifdef CONFIG_IP_ROUTE_MULTIPATH
1144 {
1145 .procname = "fib_multipath_use_neigh",
1146 .data = &init_net.ipv4.sysctl_fib_multipath_use_neigh,
1147 .maxlen = sizeof(u8),
1148 .mode = 0644,
1149 .proc_handler = proc_dou8vec_minmax,
1150 .extra1 = SYSCTL_ZERO,
1151 .extra2 = SYSCTL_ONE,
1152 },
1153 {
1154 .procname = "fib_multipath_hash_policy",
1155 .data = &init_net.ipv4.sysctl_fib_multipath_hash_policy,
1156 .maxlen = sizeof(u8),
1157 .mode = 0644,
1158 .proc_handler = proc_fib_multipath_hash_policy,
1159 .extra1 = SYSCTL_ZERO,
1160 .extra2 = SYSCTL_THREE,
1161 },
1162 {
1163 .procname = "fib_multipath_hash_fields",
1164 .data = &init_net.ipv4.sysctl_fib_multipath_hash_fields,
1165 .maxlen = sizeof(u32),
1166 .mode = 0644,
1167 .proc_handler = proc_fib_multipath_hash_fields,
1168 .extra1 = SYSCTL_ONE,
1169 .extra2 = &fib_multipath_hash_fields_all_mask,
1170 },
1171 {
1172 .procname = "fib_multipath_hash_seed",
1173 .data = &init_net,
1174 .maxlen = sizeof(u32),
1175 .mode = 0644,
1176 .proc_handler = proc_fib_multipath_hash_seed,
1177 },
1178#endif
1179 {
1180 .procname = "ip_unprivileged_port_start",
1181 .maxlen = sizeof(int),
1182 .data = &init_net.ipv4.sysctl_ip_prot_sock,
1183 .mode = 0644,
1184 .proc_handler = ipv4_privileged_ports,
1185 },
1186#ifdef CONFIG_NET_L3_MASTER_DEV
1187 {
1188 .procname = "udp_l3mdev_accept",
1189 .data = &init_net.ipv4.sysctl_udp_l3mdev_accept,
1190 .maxlen = sizeof(u8),
1191 .mode = 0644,
1192 .proc_handler = proc_dou8vec_minmax,
1193 .extra1 = SYSCTL_ZERO,
1194 .extra2 = SYSCTL_ONE,
1195 },
1196#endif
1197 {
1198 .procname = "tcp_sack",
1199 .data = &init_net.ipv4.sysctl_tcp_sack,
1200 .maxlen = sizeof(u8),
1201 .mode = 0644,
1202 .proc_handler = proc_dou8vec_minmax,
1203 },
1204 {
1205 .procname = "tcp_window_scaling",
1206 .data = &init_net.ipv4.sysctl_tcp_window_scaling,
1207 .maxlen = sizeof(u8),
1208 .mode = 0644,
1209 .proc_handler = proc_dou8vec_minmax,
1210 },
1211 {
1212 .procname = "tcp_timestamps",
1213 .data = &init_net.ipv4.sysctl_tcp_timestamps,
1214 .maxlen = sizeof(u8),
1215 .mode = 0644,
1216 .proc_handler = proc_dou8vec_minmax,
1217 },
1218 {
1219 .procname = "tcp_early_retrans",
1220 .data = &init_net.ipv4.sysctl_tcp_early_retrans,
1221 .maxlen = sizeof(u8),
1222 .mode = 0644,
1223 .proc_handler = proc_dou8vec_minmax,
1224 .extra1 = SYSCTL_ZERO,
1225 .extra2 = SYSCTL_FOUR,
1226 },
1227 {
1228 .procname = "tcp_recovery",
1229 .data = &init_net.ipv4.sysctl_tcp_recovery,
1230 .maxlen = sizeof(u8),
1231 .mode = 0644,
1232 .proc_handler = proc_dou8vec_minmax,
1233 },
1234 {
1235 .procname = "tcp_thin_linear_timeouts",
1236 .data = &init_net.ipv4.sysctl_tcp_thin_linear_timeouts,
1237 .maxlen = sizeof(u8),
1238 .mode = 0644,
1239 .proc_handler = proc_dou8vec_minmax,
1240 },
1241 {
1242 .procname = "tcp_slow_start_after_idle",
1243 .data = &init_net.ipv4.sysctl_tcp_slow_start_after_idle,
1244 .maxlen = sizeof(u8),
1245 .mode = 0644,
1246 .proc_handler = proc_dou8vec_minmax,
1247 },
1248 {
1249 .procname = "tcp_retrans_collapse",
1250 .data = &init_net.ipv4.sysctl_tcp_retrans_collapse,
1251 .maxlen = sizeof(u8),
1252 .mode = 0644,
1253 .proc_handler = proc_dou8vec_minmax,
1254 },
1255 {
1256 .procname = "tcp_stdurg",
1257 .data = &init_net.ipv4.sysctl_tcp_stdurg,
1258 .maxlen = sizeof(u8),
1259 .mode = 0644,
1260 .proc_handler = proc_dou8vec_minmax,
1261 },
1262 {
1263 .procname = "tcp_rfc1337",
1264 .data = &init_net.ipv4.sysctl_tcp_rfc1337,
1265 .maxlen = sizeof(u8),
1266 .mode = 0644,
1267 .proc_handler = proc_dou8vec_minmax,
1268 },
1269 {
1270 .procname = "tcp_abort_on_overflow",
1271 .data = &init_net.ipv4.sysctl_tcp_abort_on_overflow,
1272 .maxlen = sizeof(u8),
1273 .mode = 0644,
1274 .proc_handler = proc_dou8vec_minmax,
1275 },
1276 {
1277 .procname = "tcp_fack",
1278 .data = &init_net.ipv4.sysctl_tcp_fack,
1279 .maxlen = sizeof(u8),
1280 .mode = 0644,
1281 .proc_handler = proc_dou8vec_minmax,
1282 },
1283 {
1284 .procname = "tcp_max_reordering",
1285 .data = &init_net.ipv4.sysctl_tcp_max_reordering,
1286 .maxlen = sizeof(int),
1287 .mode = 0644,
1288 .proc_handler = proc_dointvec
1289 },
1290 {
1291 .procname = "tcp_dsack",
1292 .data = &init_net.ipv4.sysctl_tcp_dsack,
1293 .maxlen = sizeof(u8),
1294 .mode = 0644,
1295 .proc_handler = proc_dou8vec_minmax,
1296 },
1297 {
1298 .procname = "tcp_app_win",
1299 .data = &init_net.ipv4.sysctl_tcp_app_win,
1300 .maxlen = sizeof(u8),
1301 .mode = 0644,
1302 .proc_handler = proc_dou8vec_minmax,
1303 .extra1 = SYSCTL_ZERO,
1304 .extra2 = &tcp_app_win_max,
1305 },
1306 {
1307 .procname = "tcp_adv_win_scale",
1308 .data = &init_net.ipv4.sysctl_tcp_adv_win_scale,
1309 .maxlen = sizeof(int),
1310 .mode = 0644,
1311 .proc_handler = proc_dointvec_minmax,
1312 .extra1 = &tcp_adv_win_scale_min,
1313 .extra2 = &tcp_adv_win_scale_max,
1314 },
1315 {
1316 .procname = "tcp_frto",
1317 .data = &init_net.ipv4.sysctl_tcp_frto,
1318 .maxlen = sizeof(u8),
1319 .mode = 0644,
1320 .proc_handler = proc_dou8vec_minmax,
1321 },
1322 {
1323 .procname = "tcp_no_metrics_save",
1324 .data = &init_net.ipv4.sysctl_tcp_nometrics_save,
1325 .maxlen = sizeof(u8),
1326 .mode = 0644,
1327 .proc_handler = proc_dou8vec_minmax,
1328 },
1329 {
1330 .procname = "tcp_no_ssthresh_metrics_save",
1331 .data = &init_net.ipv4.sysctl_tcp_no_ssthresh_metrics_save,
1332 .maxlen = sizeof(u8),
1333 .mode = 0644,
1334 .proc_handler = proc_dou8vec_minmax,
1335 .extra1 = SYSCTL_ZERO,
1336 .extra2 = SYSCTL_ONE,
1337 },
1338 {
1339 .procname = "tcp_moderate_rcvbuf",
1340 .data = &init_net.ipv4.sysctl_tcp_moderate_rcvbuf,
1341 .maxlen = sizeof(u8),
1342 .mode = 0644,
1343 .proc_handler = proc_dou8vec_minmax,
1344 },
1345 {
1346 .procname = "tcp_rcvbuf_low_rtt",
1347 .data = &init_net.ipv4.sysctl_tcp_rcvbuf_low_rtt,
1348 .maxlen = sizeof(int),
1349 .mode = 0644,
1350 .proc_handler = proc_dointvec_minmax,
1351 .extra1 = SYSCTL_ZERO,
1352 .extra2 = SYSCTL_INT_MAX,
1353 },
1354 {
1355 .procname = "tcp_tso_win_divisor",
1356 .data = &init_net.ipv4.sysctl_tcp_tso_win_divisor,
1357 .maxlen = sizeof(u8),
1358 .mode = 0644,
1359 .proc_handler = proc_dou8vec_minmax,
1360 },
1361 {
1362 .procname = "tcp_workaround_signed_windows",
1363 .data = &init_net.ipv4.sysctl_tcp_workaround_signed_windows,
1364 .maxlen = sizeof(u8),
1365 .mode = 0644,
1366 .proc_handler = proc_dou8vec_minmax,
1367 },
1368 {
1369 .procname = "tcp_limit_output_bytes",
1370 .data = &init_net.ipv4.sysctl_tcp_limit_output_bytes,
1371 .maxlen = sizeof(int),
1372 .mode = 0644,
1373 .proc_handler = proc_dointvec
1374 },
1375 {
1376 .procname = "tcp_challenge_ack_limit",
1377 .data = &init_net.ipv4.sysctl_tcp_challenge_ack_limit,
1378 .maxlen = sizeof(int),
1379 .mode = 0644,
1380 .proc_handler = proc_dointvec
1381 },
1382 {
1383 .procname = "tcp_min_tso_segs",
1384 .data = &init_net.ipv4.sysctl_tcp_min_tso_segs,
1385 .maxlen = sizeof(u8),
1386 .mode = 0644,
1387 .proc_handler = proc_dou8vec_minmax,
1388 .extra1 = SYSCTL_ONE,
1389 },
1390 {
1391 .procname = "tcp_tso_rtt_log",
1392 .data = &init_net.ipv4.sysctl_tcp_tso_rtt_log,
1393 .maxlen = sizeof(u8),
1394 .mode = 0644,
1395 .proc_handler = proc_dou8vec_minmax,
1396 },
1397 {
1398 .procname = "tcp_min_rtt_wlen",
1399 .data = &init_net.ipv4.sysctl_tcp_min_rtt_wlen,
1400 .maxlen = sizeof(int),
1401 .mode = 0644,
1402 .proc_handler = proc_dointvec_minmax,
1403 .extra1 = SYSCTL_ZERO,
1404 .extra2 = &one_day_secs
1405 },
1406 {
1407 .procname = "tcp_autocorking",
1408 .data = &init_net.ipv4.sysctl_tcp_autocorking,
1409 .maxlen = sizeof(u8),
1410 .mode = 0644,
1411 .proc_handler = proc_dou8vec_minmax,
1412 .extra1 = SYSCTL_ZERO,
1413 .extra2 = SYSCTL_ONE,
1414 },
1415 {
1416 .procname = "tcp_invalid_ratelimit",
1417 .data = &init_net.ipv4.sysctl_tcp_invalid_ratelimit,
1418 .maxlen = sizeof(int),
1419 .mode = 0644,
1420 .proc_handler = proc_dointvec_ms_jiffies,
1421 },
1422 {
1423 .procname = "tcp_pacing_ss_ratio",
1424 .data = &init_net.ipv4.sysctl_tcp_pacing_ss_ratio,
1425 .maxlen = sizeof(int),
1426 .mode = 0644,
1427 .proc_handler = proc_dointvec_minmax,
1428 .extra1 = SYSCTL_ZERO,
1429 .extra2 = SYSCTL_ONE_THOUSAND,
1430 },
1431 {
1432 .procname = "tcp_pacing_ca_ratio",
1433 .data = &init_net.ipv4.sysctl_tcp_pacing_ca_ratio,
1434 .maxlen = sizeof(int),
1435 .mode = 0644,
1436 .proc_handler = proc_dointvec_minmax,
1437 .extra1 = SYSCTL_ZERO,
1438 .extra2 = SYSCTL_ONE_THOUSAND,
1439 },
1440 {
1441 .procname = "tcp_wmem",
1442 .data = &init_net.ipv4.sysctl_tcp_wmem,
1443 .maxlen = sizeof(init_net.ipv4.sysctl_tcp_wmem),
1444 .mode = 0644,
1445 .proc_handler = proc_dointvec_minmax,
1446 .extra1 = SYSCTL_ONE,
1447 },
1448 {
1449 .procname = "tcp_rmem",
1450 .data = &init_net.ipv4.sysctl_tcp_rmem,
1451 .maxlen = sizeof(init_net.ipv4.sysctl_tcp_rmem),
1452 .mode = 0644,
1453 .proc_handler = proc_dointvec_minmax,
1454 .extra1 = SYSCTL_ONE,
1455 },
1456 {
1457 .procname = "tcp_comp_sack_delay_ns",
1458 .data = &init_net.ipv4.sysctl_tcp_comp_sack_delay_ns,
1459 .maxlen = sizeof(unsigned long),
1460 .mode = 0644,
1461 .proc_handler = proc_doulongvec_minmax,
1462 },
1463 {
1464 .procname = "tcp_comp_sack_rtt_percent",
1465 .data = &init_net.ipv4.sysctl_tcp_comp_sack_rtt_percent,
1466 .maxlen = sizeof(int),
1467 .mode = 0644,
1468 .proc_handler = proc_dointvec_minmax,
1469 .extra1 = SYSCTL_ONE,
1470 .extra2 = SYSCTL_ONE_THOUSAND,
1471 },
1472 {
1473 .procname = "tcp_comp_sack_slack_ns",
1474 .data = &init_net.ipv4.sysctl_tcp_comp_sack_slack_ns,
1475 .maxlen = sizeof(unsigned long),
1476 .mode = 0644,
1477 .proc_handler = proc_doulongvec_minmax,
1478 },
1479 {
1480 .procname = "tcp_comp_sack_nr",
1481 .data = &init_net.ipv4.sysctl_tcp_comp_sack_nr,
1482 .maxlen = sizeof(u8),
1483 .mode = 0644,
1484 .proc_handler = proc_dou8vec_minmax,
1485 .extra1 = SYSCTL_ZERO,
1486 },
1487 {
1488 .procname = "tcp_backlog_ack_defer",
1489 .data = &init_net.ipv4.sysctl_tcp_backlog_ack_defer,
1490 .maxlen = sizeof(u8),
1491 .mode = 0644,
1492 .proc_handler = proc_dou8vec_minmax,
1493 .extra1 = SYSCTL_ZERO,
1494 .extra2 = SYSCTL_ONE,
1495 },
1496 {
1497 .procname = "tcp_reflect_tos",
1498 .data = &init_net.ipv4.sysctl_tcp_reflect_tos,
1499 .maxlen = sizeof(u8),
1500 .mode = 0644,
1501 .proc_handler = proc_dou8vec_minmax,
1502 .extra1 = SYSCTL_ZERO,
1503 .extra2 = SYSCTL_ONE,
1504 },
1505 {
1506 .procname = "tcp_ehash_entries",
1507 .data = &init_net.ipv4.sysctl_tcp_child_ehash_entries,
1508 .mode = 0444,
1509 .proc_handler = proc_tcp_ehash_entries,
1510 },
1511 {
1512 .procname = "tcp_child_ehash_entries",
1513 .data = &init_net.ipv4.sysctl_tcp_child_ehash_entries,
1514 .maxlen = sizeof(unsigned int),
1515 .mode = 0644,
1516 .proc_handler = proc_douintvec_minmax,
1517 .extra1 = SYSCTL_ZERO,
1518 .extra2 = &tcp_child_ehash_entries_max,
1519 },
1520 {
1521 .procname = "udp_hash_entries",
1522 .data = &init_net.ipv4.sysctl_udp_child_hash_entries,
1523 .mode = 0444,
1524 .proc_handler = proc_udp_hash_entries,
1525 },
1526 {
1527 .procname = "udp_child_hash_entries",
1528 .data = &init_net.ipv4.sysctl_udp_child_hash_entries,
1529 .maxlen = sizeof(unsigned int),
1530 .mode = 0644,
1531 .proc_handler = proc_douintvec_minmax,
1532 .extra1 = SYSCTL_ZERO,
1533 .extra2 = &udp_child_hash_entries_max,
1534 },
1535 {
1536 .procname = "udp_rmem_min",
1537 .data = &init_net.ipv4.sysctl_udp_rmem_min,
1538 .maxlen = sizeof(init_net.ipv4.sysctl_udp_rmem_min),
1539 .mode = 0644,
1540 .proc_handler = proc_dointvec_minmax,
1541 .extra1 = SYSCTL_ONE
1542 },
1543 {
1544 .procname = "udp_wmem_min",
1545 .data = &init_net.ipv4.sysctl_udp_wmem_min,
1546 .maxlen = sizeof(init_net.ipv4.sysctl_udp_wmem_min),
1547 .mode = 0644,
1548 .proc_handler = proc_dointvec_minmax,
1549 .extra1 = SYSCTL_ONE
1550 },
1551 {
1552 .procname = "fib_notify_on_flag_change",
1553 .data = &init_net.ipv4.sysctl_fib_notify_on_flag_change,
1554 .maxlen = sizeof(u8),
1555 .mode = 0644,
1556 .proc_handler = proc_dou8vec_minmax,
1557 .extra1 = SYSCTL_ZERO,
1558 .extra2 = SYSCTL_TWO,
1559 },
1560 {
1561 .procname = "tcp_plb_enabled",
1562 .data = &init_net.ipv4.sysctl_tcp_plb_enabled,
1563 .maxlen = sizeof(u8),
1564 .mode = 0644,
1565 .proc_handler = proc_dou8vec_minmax,
1566 .extra1 = SYSCTL_ZERO,
1567 .extra2 = SYSCTL_ONE,
1568 },
1569 {
1570 .procname = "tcp_plb_idle_rehash_rounds",
1571 .data = &init_net.ipv4.sysctl_tcp_plb_idle_rehash_rounds,
1572 .maxlen = sizeof(u8),
1573 .mode = 0644,
1574 .proc_handler = proc_dou8vec_minmax,
1575 .extra2 = &tcp_plb_max_rounds,
1576 },
1577 {
1578 .procname = "tcp_plb_rehash_rounds",
1579 .data = &init_net.ipv4.sysctl_tcp_plb_rehash_rounds,
1580 .maxlen = sizeof(u8),
1581 .mode = 0644,
1582 .proc_handler = proc_dou8vec_minmax,
1583 .extra2 = &tcp_plb_max_rounds,
1584 },
1585 {
1586 .procname = "tcp_plb_suspend_rto_sec",
1587 .data = &init_net.ipv4.sysctl_tcp_plb_suspend_rto_sec,
1588 .maxlen = sizeof(u8),
1589 .mode = 0644,
1590 .proc_handler = proc_dou8vec_minmax,
1591 },
1592 {
1593 .procname = "tcp_plb_cong_thresh",
1594 .data = &init_net.ipv4.sysctl_tcp_plb_cong_thresh,
1595 .maxlen = sizeof(int),
1596 .mode = 0644,
1597 .proc_handler = proc_dointvec_minmax,
1598 .extra1 = SYSCTL_ZERO,
1599 .extra2 = &tcp_plb_max_cong_thresh,
1600 },
1601 {
1602 .procname = "tcp_syn_linear_timeouts",
1603 .data = &init_net.ipv4.sysctl_tcp_syn_linear_timeouts,
1604 .maxlen = sizeof(u8),
1605 .mode = 0644,
1606 .proc_handler = proc_dou8vec_minmax,
1607 .extra1 = SYSCTL_ZERO,
1608 .extra2 = &tcp_syn_linear_timeouts_max,
1609 },
1610 {
1611 .procname = "tcp_shrink_window",
1612 .data = &init_net.ipv4.sysctl_tcp_shrink_window,
1613 .maxlen = sizeof(u8),
1614 .mode = 0644,
1615 .proc_handler = proc_dou8vec_minmax,
1616 .extra1 = SYSCTL_ZERO,
1617 .extra2 = SYSCTL_ONE,
1618 },
1619 {
1620 .procname = "tcp_pingpong_thresh",
1621 .data = &init_net.ipv4.sysctl_tcp_pingpong_thresh,
1622 .maxlen = sizeof(u8),
1623 .mode = 0644,
1624 .proc_handler = proc_dou8vec_minmax,
1625 .extra1 = SYSCTL_ONE,
1626 },
1627 {
1628 .procname = "tcp_rto_min_us",
1629 .data = &init_net.ipv4.sysctl_tcp_rto_min_us,
1630 .maxlen = sizeof(int),
1631 .mode = 0644,
1632 .proc_handler = proc_dointvec_minmax,
1633 .extra1 = SYSCTL_ONE,
1634 },
1635 {
1636 .procname = "tcp_rto_max_ms",
1637 .data = &init_net.ipv4.sysctl_tcp_rto_max_ms,
1638 .maxlen = sizeof(int),
1639 .mode = 0644,
1640 .proc_handler = proc_dointvec_minmax,
1641 .extra1 = SYSCTL_ONE_THOUSAND,
1642 .extra2 = &tcp_rto_max_max,
1643 },
1644};
1645
1646static __net_init int ipv4_sysctl_init_net(struct net *net)
1647{
1648 size_t table_size = ARRAY_SIZE(ipv4_net_table);
1649 struct ctl_table *table;
1650
1651 table = ipv4_net_table;
1652 if (!net_eq(net, &init_net)) {
1653 int i;
1654
1655 table = kmemdup(table, sizeof(ipv4_net_table), GFP_KERNEL);
1656 if (!table)
1657 goto err_alloc;
1658
1659 for (i = 0; i < table_size; i++) {
1660 if (table[i].data) {
1661 /* Update the variables to point into
1662 * the current struct net
1663 */
1664 table[i].data += (void *)net - (void *)&init_net;
1665 } else {
1666 /* Entries without data pointer are global;
1667 * Make them read-only in non-init_net ns
1668 */
1669 table[i].mode &= ~0222;
1670 }
1671 }
1672 }
1673
1674 net->ipv4.ipv4_hdr = register_net_sysctl_sz(net, "net/ipv4", table,
1675 table_size);
1676 if (!net->ipv4.ipv4_hdr)
1677 goto err_reg;
1678
1679 net->ipv4.sysctl_local_reserved_ports = kzalloc(65536 / 8, GFP_KERNEL);
1680 if (!net->ipv4.sysctl_local_reserved_ports)
1681 goto err_ports;
1682
1683 proc_fib_multipath_hash_set_seed(net, 0);
1684
1685 return 0;
1686
1687err_ports:
1688 unregister_net_sysctl_table(net->ipv4.ipv4_hdr);
1689err_reg:
1690 if (!net_eq(net, &init_net))
1691 kfree(table);
1692err_alloc:
1693 return -ENOMEM;
1694}
1695
1696static __net_exit void ipv4_sysctl_exit_net(struct net *net)
1697{
1698 const struct ctl_table *table;
1699
1700 kfree(net->ipv4.sysctl_local_reserved_ports);
1701 table = net->ipv4.ipv4_hdr->ctl_table_arg;
1702 unregister_net_sysctl_table(net->ipv4.ipv4_hdr);
1703 kfree(table);
1704}
1705
1706static __net_initdata struct pernet_operations ipv4_sysctl_ops = {
1707 .init = ipv4_sysctl_init_net,
1708 .exit = ipv4_sysctl_exit_net,
1709};
1710
1711static __init int sysctl_ipv4_init(void)
1712{
1713 struct ctl_table_header *hdr;
1714
1715 hdr = register_net_sysctl(&init_net, "net/ipv4", ipv4_table);
1716 if (!hdr)
1717 return -ENOMEM;
1718
1719 proc_fib_multipath_hash_init_rand_seed();
1720
1721 if (register_pernet_subsys(&ipv4_sysctl_ops)) {
1722 unregister_net_sysctl_table(hdr);
1723 return -ENOMEM;
1724 }
1725
1726 return 0;
1727}
1728
1729__initcall(sysctl_ipv4_init);