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efi: vars: Move efivar caching layer into efivarfs
[linux-2.6-block.git] / net / ipv4 / sysctl_net_ipv4.c
CommitLineData
b2441318 1// SPDX-License-Identifier: GPL-2.0
1da177e4
LT		 2/*
3 * sysctl_net_ipv4.c: sysctl interface to net IPV4 subsystem.
4 *
1da177e4
LT		 5 * Begun April 1, 1996, Mike Shaver.
6 * Added /proc/sys/net/ipv4 directory entry (empty =) ). [MS]
7 */
8
1da177e4 9#include <linux/sysctl.h>
227b60f5 10#include <linux/seqlock.h>
3e37c3f9 11#include <linux/init.h>
5a0e3ad6 12#include <linux/slab.h>
20380731 13#include <net/icmp.h>
1da177e4 14#include <net/ip.h>
ce5c9c20 15#include <net/ip_fib.h>
1da177e4 16#include <net/tcp.h>
95766fff 17#include <net/udp.h>
446fda4f 18#include <net/cipso_ipv4.h>
c319b4d7 19#include <net/ping.h>
dddb64bc 20#include <net/protocol.h>
3ae6ec08 21#include <net/netevent.h>
1da177e4 22
e905a9ed 23static int tcp_retr1_max = 255;
1da177e4
LT		 24static int ip_local_port_range_min[] = { 1, 1 };
25static int ip_local_port_range_max[] = { 65535, 65535 };
0147fc05
AD		 26static int tcp_adv_win_scale_min = -31;
27static int tcp_adv_win_scale_max = 31;
5f3e2bf0
ED		 28static int tcp_min_snd_mss_min = TCP_MIN_SND_MSS;
29static int tcp_min_snd_mss_max = 65535;
4548b683
KJ		 30static int ip_privileged_port_min;
31static int ip_privileged_port_max = 65535;
249fab77
ED		 32static int ip_ttl_min = 1;
33static int ip_ttl_max = 255;
651e9271
MT		 34static int tcp_syn_retries_min = 1;
35static int tcp_syn_retries_max = MAX_TCP_SYNCNT;
c319b4d7
VK		 36static int ip_ping_group_range_min[] = { 0, 0 };
37static int ip_ping_group_range_max[] = { GID_T_MAX, GID_T_MAX };
d4ce5808 38static u32 u32_max_div_HZ = UINT_MAX / HZ;
19fad20d 39static int one_day_secs = 24 * 3600;
ce5c9c20
IS		 40static u32 fib_multipath_hash_fields_all_mask __maybe_unused =
41 FIB_MULTIPATH_HASH_FIELD_ALL_MASK;
1da177e4 42
b6690b14
FW		 43/* obsolete */
44static int sysctl_tcp_low_latency __read_mostly;
45
227b60f5 46/* Update system visible IP port range */
0bbf87d8 47static void set_local_port_range(struct net *net, int range[2])
227b60f5 48{
ed2dfd90
ED		 49 bool same_parity = !((range[0] ^ range[1]) & 1);
50
4ee3bd4a 51 write_seqlock_bh(&net->ipv4.ip_local_ports.lock);
ed2dfd90
ED		 52 if (same_parity && !net->ipv4.ip_local_ports.warned) {
53 net->ipv4.ip_local_ports.warned = true;
54 pr_err_ratelimited("ip_local_port_range: prefer different parity for start/end values.\n");
55 }
c9d8f1a6
CW		 56 net->ipv4.ip_local_ports.range[0] = range[0];
57 net->ipv4.ip_local_ports.range[1] = range[1];
4ee3bd4a 58 write_sequnlock_bh(&net->ipv4.ip_local_ports.lock);
227b60f5
SH		 59}
60
61/* Validate changes from /proc interface. */
fe2c6338 62static int ipv4_local_port_range(struct ctl_table *table, int write,
32927393 63 void *buffer, size_t *lenp, loff_t *ppos)
227b60f5 64{
0bbf87d8 65 struct net *net =
c9d8f1a6 66 container_of(table->data, struct net, ipv4.ip_local_ports.range);
227b60f5 67 int ret;
3c689b73 68 int range[2];
fe2c6338 69 struct ctl_table tmp = {
227b60f5
SH		 70 .data = &range,
71 .maxlen = sizeof(range),
72 .mode = table->mode,
73 .extra1 = &ip_local_port_range_min,
74 .extra2 = &ip_local_port_range_max,
75 };
76
0bbf87d8
EB		 77 inet_get_local_port_range(net, &range[0], &range[1]);
78
8d65af78 79 ret = proc_dointvec_minmax(&tmp, write, buffer, lenp, ppos);
227b60f5
SH		 80
81 if (write && ret == 0) {
4548b683
KJ		 82 /* Ensure that the upper limit is not smaller than the lower,
83 * and that the lower does not encroach upon the privileged
84 * port limit.
85 */
86 if ((range[1] < range[0]) ||
87 (range[0] < net->ipv4.sysctl_ip_prot_sock))
227b60f5
SH		 88 ret = -EINVAL;
89 else
0bbf87d8 90 set_local_port_range(net, range);
227b60f5
SH		 91 }
92
93 return ret;
94}
95
4548b683
KJ		 96/* Validate changes from /proc interface. */
97static int ipv4_privileged_ports(struct ctl_table *table, int write,
32927393 98 void *buffer, size_t *lenp, loff_t *ppos)
4548b683
KJ		 99{
100 struct net *net = container_of(table->data, struct net,
101 ipv4.sysctl_ip_prot_sock);
102 int ret;
103 int pports;
104 int range[2];
105 struct ctl_table tmp = {
106 .data = &pports,
107 .maxlen = sizeof(pports),
108 .mode = table->mode,
109 .extra1 = &ip_privileged_port_min,
110 .extra2 = &ip_privileged_port_max,
111 };
112
113 pports = net->ipv4.sysctl_ip_prot_sock;
114
115 ret = proc_dointvec_minmax(&tmp, write, buffer, lenp, ppos);
116
117 if (write && ret == 0) {
118 inet_get_local_port_range(net, &range[0], &range[1]);
119 /* Ensure that the local port range doesn't overlap with the
120 * privileged port range.
121 */
122 if (range[0] < pports)
123 ret = -EINVAL;
124 else
125 net->ipv4.sysctl_ip_prot_sock = pports;
126 }
127
128 return ret;
129}
c319b4d7 130
7064d16e 131static void inet_get_ping_group_range_table(struct ctl_table *table, kgid_t *low, kgid_t *high)
c319b4d7 132{
7064d16e 133 kgid_t *data = table->data;
0bbf87d8 134 struct net *net =
ba6b918a 135 container_of(table->data, struct net, ipv4.ping_group_range.range);
95c96174 136 unsigned int seq;
c319b4d7 137 do {
396a30cc 138 seq = read_seqbegin(&net->ipv4.ping_group_range.lock);
c319b4d7
VK		 139
140 *low = data[0];
141 *high = data[1];
396a30cc 142 } while (read_seqretry(&net->ipv4.ping_group_range.lock, seq));
c319b4d7
VK		 143}
144
145/* Update system visible IP port range */
7064d16e 146static void set_ping_group_range(struct ctl_table *table, kgid_t low, kgid_t high)
c319b4d7 147{
7064d16e 148 kgid_t *data = table->data;
0bbf87d8 149 struct net *net =
ba6b918a 150 container_of(table->data, struct net, ipv4.ping_group_range.range);
396a30cc 151 write_seqlock(&net->ipv4.ping_group_range.lock);
7064d16e
EB		 152 data[0] = low;
153 data[1] = high;
396a30cc 154 write_sequnlock(&net->ipv4.ping_group_range.lock);
c319b4d7
VK		 155}
156
157/* Validate changes from /proc interface. */
fe2c6338 158static int ipv4_ping_group_range(struct ctl_table *table, int write,
32927393 159 void *buffer, size_t *lenp, loff_t *ppos)
c319b4d7 160{
7064d16e 161 struct user_namespace *user_ns = current_user_ns();
c319b4d7 162 int ret;
7064d16e
EB		 163 gid_t urange[2];
164 kgid_t low, high;
fe2c6338 165 struct ctl_table tmp = {
7064d16e
EB		 166 .data = &urange,
167 .maxlen = sizeof(urange),
c319b4d7
VK		 168 .mode = table->mode,
169 .extra1 = &ip_ping_group_range_min,
170 .extra2 = &ip_ping_group_range_max,
171 };
172
7064d16e
EB		 173 inet_get_ping_group_range_table(table, &low, &high);
174 urange[0] = from_kgid_munged(user_ns, low);
175 urange[1] = from_kgid_munged(user_ns, high);
c319b4d7
VK		 176 ret = proc_dointvec_minmax(&tmp, write, buffer, lenp, ppos);
177
7064d16e
EB		 178 if (write && ret == 0) {
179 low = make_kgid(user_ns, urange[0]);
180 high = make_kgid(user_ns, urange[1]);
70ba5b6d
TH		 181 if (!gid_valid(low) || !gid_valid(high))
182 return -EINVAL;
183 if (urange[1] < urange[0] || gid_lt(high, low)) {
7064d16e
EB		 184 low = make_kgid(&init_user_ns, 1);
185 high = make_kgid(&init_user_ns, 0);
186 }
187 set_ping_group_range(table, low, high);
188 }
c319b4d7
VK		 189
190 return ret;
191}
192
d18c5d19 193static int ipv4_fwd_update_priority(struct ctl_table *table, int write,
32927393 194 void *buffer, size_t *lenp, loff_t *ppos)
d18c5d19
PM		 195{
196 struct net *net;
197 int ret;
198
199 net = container_of(table->data, struct net,
200 ipv4.sysctl_ip_fwd_update_priority);
1c69dedc 201 ret = proc_dou8vec_minmax(table, write, buffer, lenp, ppos);
d18c5d19
PM		 202 if (write && ret == 0)
203 call_netevent_notifiers(NETEVENT_IPV4_FWD_UPDATE_PRIORITY_UPDATE,
204 net);
205
206 return ret;
207}
208
fe2c6338 209static int proc_tcp_congestion_control(struct ctl_table *ctl, int write,
32927393 210 void *buffer, size_t *lenp, loff_t *ppos)
317a76f9 211{
6670e152
SH		 212 struct net *net = container_of(ctl->data, struct net,
213 ipv4.tcp_congestion_control);
317a76f9 214 char val[TCP_CA_NAME_MAX];
fe2c6338 215 struct ctl_table tbl = {
317a76f9
SH		 216 .data = val,
217 .maxlen = TCP_CA_NAME_MAX,
218 };
219 int ret;
220
6670e152 221 tcp_get_default_congestion_control(net, val);
317a76f9 222
8d65af78 223 ret = proc_dostring(&tbl, write, buffer, lenp, ppos);
317a76f9 224 if (write && ret == 0)
6670e152 225 ret = tcp_set_default_congestion_control(net, val);
317a76f9
SH		 226 return ret;
227}
228
fe2c6338 229static int proc_tcp_available_congestion_control(struct ctl_table *ctl,
32927393
CH		 230 int write, void *buffer,
231 size_t *lenp, loff_t *ppos)
3ff825b2 232{
fe2c6338 233 struct ctl_table tbl = { .maxlen = TCP_CA_BUF_MAX, };
3ff825b2
SH		 234 int ret;
235
236 tbl.data = kmalloc(tbl.maxlen, GFP_USER);
237 if (!tbl.data)
238 return -ENOMEM;
239 tcp_get_available_congestion_control(tbl.data, TCP_CA_BUF_MAX);
8d65af78 240 ret = proc_dostring(&tbl, write, buffer, lenp, ppos);
3ff825b2
SH		 241 kfree(tbl.data);
242 return ret;
243}
244
fe2c6338 245static int proc_allowed_congestion_control(struct ctl_table *ctl,
32927393
CH		 246 int write, void *buffer,
247 size_t *lenp, loff_t *ppos)
ce7bc3bf 248{
fe2c6338 249 struct ctl_table tbl = { .maxlen = TCP_CA_BUF_MAX };
ce7bc3bf
SH		 250 int ret;
251
252 tbl.data = kmalloc(tbl.maxlen, GFP_USER);
253 if (!tbl.data)
254 return -ENOMEM;
255
256 tcp_get_allowed_congestion_control(tbl.data, tbl.maxlen);
8d65af78 257 ret = proc_dostring(&tbl, write, buffer, lenp, ppos);
ce7bc3bf
SH		 258 if (write && ret == 0)
259 ret = tcp_set_allowed_congestion_control(tbl.data);
260 kfree(tbl.data);
261 return ret;
262}
263
aa1236cd
JB		 264static int sscanf_key(char *buf, __le32 *key)
265{
266 u32 user_key[4];
267 int i, ret = 0;
268
269 if (sscanf(buf, "%x-%x-%x-%x", user_key, user_key + 1,
270 user_key + 2, user_key + 3) != 4) {
271 ret = -EINVAL;
272 } else {
273 for (i = 0; i < ARRAY_SIZE(user_key); i++)
274 key[i] = cpu_to_le32(user_key[i]);
275 }
276 pr_debug("proc TFO key set 0x%x-%x-%x-%x <- 0x%s: %u\n",
277 user_key[0], user_key[1], user_key[2], user_key[3], buf, ret);
278
279 return ret;
280}
281
43713848 282static int proc_tcp_fastopen_key(struct ctl_table *table, int write,
32927393 283 void *buffer, size_t *lenp, loff_t *ppos)
10467163 284{
43713848
HY		 285 struct net *net = container_of(table->data, struct net,
286 ipv4.sysctl_tcp_fastopen);
aa1236cd
JB		 287 /* maxlen to print the list of keys in hex (*2), with dashes
288 * separating doublewords and a comma in between keys.
289 */
290 struct ctl_table tbl = { .maxlen = ((TCP_FASTOPEN_KEY_LENGTH *
291 2 * TCP_FASTOPEN_KEY_MAX) +
292 (TCP_FASTOPEN_KEY_MAX * 5)) };
f19008e6
JB		 293 u32 user_key[TCP_FASTOPEN_KEY_BUF_LENGTH / sizeof(u32)];
294 __le32 key[TCP_FASTOPEN_KEY_BUF_LENGTH / sizeof(__le32)];
aa1236cd 295 char *backup_data;
f19008e6 296 int ret, i = 0, off = 0, n_keys;
10467163
JC		 297
298 tbl.data = kmalloc(tbl.maxlen, GFP_KERNEL);
299 if (!tbl.data)
300 return -ENOMEM;
301
f19008e6 302 n_keys = tcp_fastopen_get_cipher(net, NULL, (u64 *)key);
aa1236cd
JB		 303 if (!n_keys) {
304 memset(&key[0], 0, TCP_FASTOPEN_KEY_LENGTH);
305 n_keys = 1;
306 }
307
308 for (i = 0; i < n_keys * 4; i++)
c860e997
YC		 309 user_key[i] = le32_to_cpu(key[i]);
310
aa1236cd
JB		 311 for (i = 0; i < n_keys; i++) {
312 off += snprintf(tbl.data + off, tbl.maxlen - off,
313 "%08x-%08x-%08x-%08x",
314 user_key[i * 4],
315 user_key[i * 4 + 1],
316 user_key[i * 4 + 2],
317 user_key[i * 4 + 3]);
9bb59a21
HL		 318
319 if (WARN_ON_ONCE(off >= tbl.maxlen - 1))
320 break;
321
aa1236cd
JB		 322 if (i + 1 < n_keys)
323 off += snprintf(tbl.data + off, tbl.maxlen - off, ",");
324 }
325
10467163
JC		 326 ret = proc_dostring(&tbl, write, buffer, lenp, ppos);
327
328 if (write && ret == 0) {
aa1236cd
JB		 329 backup_data = strchr(tbl.data, ',');
330 if (backup_data) {
331 *backup_data = '\0';
332 backup_data++;
333 }
334 if (sscanf_key(tbl.data, key)) {
10467163
JC		 335 ret = -EINVAL;
336 goto bad_key;
337 }
aa1236cd
JB		 338 if (backup_data) {
339 if (sscanf_key(backup_data, key + 4)) {
340 ret = -EINVAL;
341 goto bad_key;
342 }
343 }
344 tcp_fastopen_reset_cipher(net, NULL, key,
438ac880 345 backup_data ? key + 4 : NULL);
10467163
JC		 346 }
347
348bad_key:
10467163
JC		 349 kfree(tbl.data);
350 return ret;
351}
352
dddb64bc 353static void proc_configure_early_demux(int enabled, int protocol)
354{
355 struct net_protocol *ipprot;
356#if IS_ENABLED(CONFIG_IPV6)
357 struct inet6_protocol *ip6prot;
358#endif
359
58c4c6a3
DA		 360 rcu_read_lock();
361
dddb64bc 362 ipprot = rcu_dereference(inet_protos[protocol]);
363 if (ipprot)
364 ipprot->early_demux = enabled ? ipprot->early_demux_handler :
365 NULL;
366
367#if IS_ENABLED(CONFIG_IPV6)
368 ip6prot = rcu_dereference(inet6_protos[protocol]);
369 if (ip6prot)
370 ip6prot->early_demux = enabled ? ip6prot->early_demux_handler :
371 NULL;
372#endif
58c4c6a3 373 rcu_read_unlock();
dddb64bc 374}
375
376static int proc_tcp_early_demux(struct ctl_table *table, int write,
32927393 377 void *buffer, size_t *lenp, loff_t *ppos)
dddb64bc 378{
379 int ret = 0;
380
2932bcda 381 ret = proc_dou8vec_minmax(table, write, buffer, lenp, ppos);
dddb64bc 382
383 if (write && !ret) {
384 int enabled = init_net.ipv4.sysctl_tcp_early_demux;
385
386 proc_configure_early_demux(enabled, IPPROTO_TCP);
387 }
388
389 return ret;
390}
391
392static int proc_udp_early_demux(struct ctl_table *table, int write,
32927393 393 void *buffer, size_t *lenp, loff_t *ppos)
dddb64bc 394{
395 int ret = 0;
396
2932bcda 397 ret = proc_dou8vec_minmax(table, write, buffer, lenp, ppos);
dddb64bc 398
399 if (write && !ret) {
400 int enabled = init_net.ipv4.sysctl_udp_early_demux;
401
402 proc_configure_early_demux(enabled, IPPROTO_UDP);
403 }
404
405 return ret;
406}
407
cf1ef3f0 408static int proc_tfo_blackhole_detect_timeout(struct ctl_table *table,
32927393 409 int write, void *buffer,
cf1ef3f0
WW		 410 size_t *lenp, loff_t *ppos)
411{
3733be14
HY		 412 struct net *net = container_of(table->data, struct net,
413 ipv4.sysctl_tcp_fastopen_blackhole_timeout);
cf1ef3f0
WW		 414 int ret;
415
416 ret = proc_dointvec_minmax(table, write, buffer, lenp, ppos);
417 if (write && ret == 0)
3733be14 418 atomic_set(&net->ipv4.tfo_active_disable_times, 0);
734942cc
DW		 419
420 return ret;
421}
422
423static int proc_tcp_available_ulp(struct ctl_table *ctl,
32927393 424 int write, void *buffer, size_t *lenp,
734942cc
DW		 425 loff_t *ppos)
426{
427 struct ctl_table tbl = { .maxlen = TCP_ULP_BUF_MAX, };
428 int ret;
429
430 tbl.data = kmalloc(tbl.maxlen, GFP_USER);
431 if (!tbl.data)
432 return -ENOMEM;
433 tcp_get_available_ulp(tbl.data, TCP_ULP_BUF_MAX);
434 ret = proc_dostring(&tbl, write, buffer, lenp, ppos);
435 kfree(tbl.data);
436
cf1ef3f0
WW		 437 return ret;
438}
439
3ae6ec08
IS		 440#ifdef CONFIG_IP_ROUTE_MULTIPATH
441static int proc_fib_multipath_hash_policy(struct ctl_table *table, int write,
32927393 442 void *buffer, size_t *lenp,
3ae6ec08
IS		 443 loff_t *ppos)
444{
445 struct net *net = container_of(table->data, struct net,
446 ipv4.sysctl_fib_multipath_hash_policy);
447 int ret;
448
be205fe6 449 ret = proc_dou8vec_minmax(table, write, buffer, lenp, ppos);
3ae6ec08 450 if (write && ret == 0)
3192dac6 451 call_netevent_notifiers(NETEVENT_IPV4_MPATH_HASH_UPDATE, net);
3ae6ec08
IS		 452
453 return ret;
454}
eb0e4d59
IS		 455
456static int proc_fib_multipath_hash_fields(struct ctl_table *table, int write,
457 void *buffer, size_t *lenp,
458 loff_t *ppos)
459{
460 struct net *net;
461 int ret;
462
463 net = container_of(table->data, struct net,
464 ipv4.sysctl_fib_multipath_hash_fields);
465 ret = proc_douintvec_minmax(table, write, buffer, lenp, ppos);
466 if (write && ret == 0)
467 call_netevent_notifiers(NETEVENT_IPV4_MPATH_HASH_UPDATE, net);
468
469 return ret;
470}
3ae6ec08
IS		 471#endif
472
3e37c3f9 473static struct ctl_table ipv4_table[] = {
1da177e4 474 {
1da177e4
LT		 475 .procname = "tcp_max_orphans",
476 .data = &sysctl_tcp_max_orphans,
477 .maxlen = sizeof(int),
478 .mode = 0644,
6d9f239a 479 .proc_handler = proc_dointvec
1da177e4 480 },
1da177e4 481 {
1da177e4
LT		 482 .procname = "inet_peer_threshold",
483 .data = &inet_peer_threshold,
484 .maxlen = sizeof(int),
485 .mode = 0644,
6d9f239a 486 .proc_handler = proc_dointvec
1da177e4
LT		 487 },
488 {
1da177e4
LT		 489 .procname = "inet_peer_minttl",
490 .data = &inet_peer_minttl,
491 .maxlen = sizeof(int),
492 .mode = 0644,
6d9f239a 493 .proc_handler = proc_dointvec_jiffies,
1da177e4
LT		 494 },
495 {
1da177e4
LT		 496 .procname = "inet_peer_maxttl",
497 .data = &inet_peer_maxttl,
498 .maxlen = sizeof(int),
499 .mode = 0644,
6d9f239a 500 .proc_handler = proc_dointvec_jiffies,
1da177e4 501 },
a4fe34bf
EB		 502 {
503 .procname = "tcp_mem",
504 .maxlen = sizeof(sysctl_tcp_mem),
505 .data = &sysctl_tcp_mem,
506 .mode = 0644,
507 .proc_handler = proc_doulongvec_minmax,
508 },
1da177e4 509 {
1da177e4
LT		 510 .procname = "tcp_low_latency",
511 .data = &sysctl_tcp_low_latency,
512 .maxlen = sizeof(int),
513 .mode = 0644,
6d9f239a 514 .proc_handler = proc_dointvec
1da177e4 515 },
446fda4f
PM		 516#ifdef CONFIG_NETLABEL
517 {
446fda4f
PM		 518 .procname = "cipso_cache_enable",
519 .data = &cipso_v4_cache_enabled,
520 .maxlen = sizeof(int),
521 .mode = 0644,
6d9f239a 522 .proc_handler = proc_dointvec,
446fda4f
PM		 523 },
524 {
446fda4f
PM		 525 .procname = "cipso_cache_bucket_size",
526 .data = &cipso_v4_cache_bucketsize,
527 .maxlen = sizeof(int),
528 .mode = 0644,
6d9f239a 529 .proc_handler = proc_dointvec,
446fda4f
PM		 530 },
531 {
446fda4f
PM		 532 .procname = "cipso_rbm_optfmt",
533 .data = &cipso_v4_rbm_optfmt,
534 .maxlen = sizeof(int),
535 .mode = 0644,
6d9f239a 536 .proc_handler = proc_dointvec,
446fda4f
PM		 537 },
538 {
446fda4f
PM		 539 .procname = "cipso_rbm_strictvalid",
540 .data = &cipso_v4_rbm_strictvalid,
541 .maxlen = sizeof(int),
542 .mode = 0644,
6d9f239a 543 .proc_handler = proc_dointvec,
446fda4f
PM		 544 },
545#endif /* CONFIG_NETLABEL */
734942cc
DW		 546 {
547 .procname = "tcp_available_ulp",
548 .maxlen = TCP_ULP_BUF_MAX,
549 .mode = 0444,
550 .proc_handler = proc_tcp_available_ulp,
551 },
4cdf507d
ED		 552 {
553 .procname = "icmp_msgs_per_sec",
554 .data = &sysctl_icmp_msgs_per_sec,
555 .maxlen = sizeof(int),
556 .mode = 0644,
557 .proc_handler = proc_dointvec_minmax,
eec4844f 558 .extra1 = SYSCTL_ZERO,
4cdf507d
ED		 559 },
560 {
561 .procname = "icmp_msgs_burst",
562 .data = &sysctl_icmp_msgs_burst,
563 .maxlen = sizeof(int),
564 .mode = 0644,
565 .proc_handler = proc_dointvec_minmax,
eec4844f 566 .extra1 = SYSCTL_ZERO,
4cdf507d 567 },
95766fff 568 {
95766fff
HA		 569 .procname = "udp_mem",
570 .data = &sysctl_udp_mem,
571 .maxlen = sizeof(sysctl_udp_mem),
572 .mode = 0644,
8d987e5c 573 .proc_handler = proc_doulongvec_minmax,
95766fff 574 },
9ab948a9
DA		 575 {
576 .procname = "fib_sync_mem",
577 .data = &sysctl_fib_sync_mem,
578 .maxlen = sizeof(sysctl_fib_sync_mem),
579 .mode = 0644,
580 .proc_handler = proc_douintvec_minmax,
581 .extra1 = &sysctl_fib_sync_mem_min,
582 .extra2 = &sysctl_fib_sync_mem_max,
583 },
f8572d8f 584 { }
1da177e4 585};
3e37c3f9 586
68528f09 587static struct ctl_table ipv4_net_table[] = {
fbb82952
ED		 588 /* tcp_max_tw_buckets must be first in this table. */
589 {
590 .procname = "tcp_max_tw_buckets",
591/* .data = &init_net.ipv4.tcp_death_row.sysctl_max_tw_buckets, */
592 .maxlen = sizeof(int),
593 .mode = 0644,
594 .proc_handler = proc_dointvec
595 },
68528f09 596 {
68528f09
PE		 597 .procname = "icmp_echo_ignore_all",
598 .data = &init_net.ipv4.sysctl_icmp_echo_ignore_all,
4b6bbf17 599 .maxlen = sizeof(u8),
68528f09 600 .mode = 0644,
4b6bbf17 601 .proc_handler = proc_dou8vec_minmax,
68528f09 602 },
f1b8fa9f
AR		 603 {
604 .procname = "icmp_echo_enable_probe",
605 .data = &init_net.ipv4.sysctl_icmp_echo_enable_probe,
b8128656 606 .maxlen = sizeof(u8),
f1b8fa9f 607 .mode = 0644,
b8128656 608 .proc_handler = proc_dou8vec_minmax,
f1b8fa9f
AR		 609 .extra1 = SYSCTL_ZERO,
610 .extra2 = SYSCTL_ONE
611 },
68528f09 612 {
68528f09
PE		 613 .procname = "icmp_echo_ignore_broadcasts",
614 .data = &init_net.ipv4.sysctl_icmp_echo_ignore_broadcasts,
4b6bbf17 615 .maxlen = sizeof(u8),
68528f09 616 .mode = 0644,
4b6bbf17 617 .proc_handler = proc_dou8vec_minmax,
68528f09
PE		 618 },
619 {
68528f09
PE		 620 .procname = "icmp_ignore_bogus_error_responses",
621 .data = &init_net.ipv4.sysctl_icmp_ignore_bogus_error_responses,
4b6bbf17 622 .maxlen = sizeof(u8),
68528f09 623 .mode = 0644,
4b6bbf17 624 .proc_handler = proc_dou8vec_minmax,
68528f09
PE		 625 },
626 {
68528f09
PE		 627 .procname = "icmp_errors_use_inbound_ifaddr",
628 .data = &init_net.ipv4.sysctl_icmp_errors_use_inbound_ifaddr,
4b6bbf17 629 .maxlen = sizeof(u8),
68528f09 630 .mode = 0644,
4b6bbf17 631 .proc_handler = proc_dou8vec_minmax,
68528f09
PE		 632 },
633 {
68528f09
PE		 634 .procname = "icmp_ratelimit",
635 .data = &init_net.ipv4.sysctl_icmp_ratelimit,
636 .maxlen = sizeof(int),
637 .mode = 0644,
6d9f239a 638 .proc_handler = proc_dointvec_ms_jiffies,
68528f09
PE		 639 },
640 {
68528f09
PE		 641 .procname = "icmp_ratemask",
642 .data = &init_net.ipv4.sysctl_icmp_ratemask,
643 .maxlen = sizeof(int),
644 .mode = 0644,
6d9f239a 645 .proc_handler = proc_dointvec
68528f09 646 },
c319b4d7
VK		 647 {
648 .procname = "ping_group_range",
ba6b918a 649 .data = &init_net.ipv4.ping_group_range.range,
7064d16e 650 .maxlen = sizeof(gid_t)*2,
c319b4d7
VK		 651 .mode = 0644,
652 .proc_handler = ipv4_ping_group_range,
653 },
6897445f
MM		 654#ifdef CONFIG_NET_L3_MASTER_DEV
655 {
656 .procname = "raw_l3mdev_accept",
657 .data = &init_net.ipv4.sysctl_raw_l3mdev_accept,
4b6bbf17 658 .maxlen = sizeof(u8),
6897445f 659 .mode = 0644,
4b6bbf17 660 .proc_handler = proc_dou8vec_minmax,
eec4844f
MC		 661 .extra1 = SYSCTL_ZERO,
662 .extra2 = SYSCTL_ONE,
6897445f
MM		 663 },
664#endif
5d134f1c
HFS		 665 {
666 .procname = "tcp_ecn",
667 .data = &init_net.ipv4.sysctl_tcp_ecn,
4b6bbf17 668 .maxlen = sizeof(u8),
5d134f1c 669 .mode = 0644,
4b6bbf17 670 .proc_handler = proc_dou8vec_minmax,
5d134f1c 671 },
49213555
DB		 672 {
673 .procname = "tcp_ecn_fallback",
674 .data = &init_net.ipv4.sysctl_tcp_ecn_fallback,
4b6bbf17 675 .maxlen = sizeof(u8),
49213555 676 .mode = 0644,
4b6bbf17 677 .proc_handler = proc_dou8vec_minmax,
49213555 678 },
287b7f38
NB		 679 {
680 .procname = "ip_dynaddr",
681 .data = &init_net.ipv4.sysctl_ip_dynaddr,
4b6bbf17 682 .maxlen = sizeof(u8),
287b7f38 683 .mode = 0644,
4b6bbf17 684 .proc_handler = proc_dou8vec_minmax,
287b7f38 685 },
e21145a9
NB		 686 {
687 .procname = "ip_early_demux",
688 .data = &init_net.ipv4.sysctl_ip_early_demux,
4b6bbf17 689 .maxlen = sizeof(u8),
e21145a9 690 .mode = 0644,
4b6bbf17 691 .proc_handler = proc_dou8vec_minmax,
e21145a9 692 },
dddb64bc 693 {
694 .procname = "udp_early_demux",
695 .data = &init_net.ipv4.sysctl_udp_early_demux,
2932bcda 696 .maxlen = sizeof(u8),
dddb64bc 697 .mode = 0644,
698 .proc_handler = proc_udp_early_demux
699 },
700 {
701 .procname = "tcp_early_demux",
702 .data = &init_net.ipv4.sysctl_tcp_early_demux,
2932bcda 703 .maxlen = sizeof(u8),
dddb64bc 704 .mode = 0644,
705 .proc_handler = proc_tcp_early_demux
706 },
4f80116d
RP		 707 {
708 .procname = "nexthop_compat_mode",
709 .data = &init_net.ipv4.sysctl_nexthop_compat_mode,
4b6bbf17 710 .maxlen = sizeof(u8),
4f80116d 711 .mode = 0644,
4b6bbf17 712 .proc_handler = proc_dou8vec_minmax,
4f80116d
RP		 713 .extra1 = SYSCTL_ZERO,
714 .extra2 = SYSCTL_ONE,
715 },
fa50d974
NB		 716 {
717 .procname = "ip_default_ttl",
718 .data = &init_net.ipv4.sysctl_ip_default_ttl,
4b6bbf17 719 .maxlen = sizeof(u8),
fa50d974 720 .mode = 0644,
4b6bbf17 721 .proc_handler = proc_dou8vec_minmax,
fa50d974
NB		 722 .extra1 = &ip_ttl_min,
723 .extra2 = &ip_ttl_max,
724 },
0bbf87d8
EB		 725 {
726 .procname = "ip_local_port_range",
c9d8f1a6
CW		 727 .maxlen = sizeof(init_net.ipv4.ip_local_ports.range),
728 .data = &init_net.ipv4.ip_local_ports.range,
0bbf87d8
EB		 729 .mode = 0644,
730 .proc_handler = ipv4_local_port_range,
731 },
122ff243
WC		 732 {
733 .procname = "ip_local_reserved_ports",
734 .data = &init_net.ipv4.sysctl_local_reserved_ports,
735 .maxlen = 65536,
736 .mode = 0644,
737 .proc_handler = proc_do_large_bitmap,
738 },
974eda11
HFS		 739 {
740 .procname = "ip_no_pmtu_disc",
741 .data = &init_net.ipv4.sysctl_ip_no_pmtu_disc,
4b6bbf17 742 .maxlen = sizeof(u8),
974eda11 743 .mode = 0644,
4b6bbf17 744 .proc_handler = proc_dou8vec_minmax,
974eda11 745 },
f87c10a8
HFS		 746 {
747 .procname = "ip_forward_use_pmtu",
748 .data = &init_net.ipv4.sysctl_ip_fwd_use_pmtu,
4b6bbf17 749 .maxlen = sizeof(u8),
f87c10a8 750 .mode = 0644,
4b6bbf17 751 .proc_handler = proc_dou8vec_minmax,
f87c10a8 752 },
432e05d3
PM		 753 {
754 .procname = "ip_forward_update_priority",
755 .data = &init_net.ipv4.sysctl_ip_fwd_update_priority,
1c69dedc 756 .maxlen = sizeof(u8),
432e05d3 757 .mode = 0644,
d18c5d19 758 .proc_handler = ipv4_fwd_update_priority,
eec4844f
MC		 759 .extra1 = SYSCTL_ZERO,
760 .extra2 = SYSCTL_ONE,
432e05d3 761 },
49a60158
VB		 762 {
763 .procname = "ip_nonlocal_bind",
764 .data = &init_net.ipv4.sysctl_ip_nonlocal_bind,
4b6bbf17 765 .maxlen = sizeof(u8),
49a60158 766 .mode = 0644,
4b6bbf17 767 .proc_handler = proc_dou8vec_minmax,
49a60158 768 },
4b01a967
KI		 769 {
770 .procname = "ip_autobind_reuse",
771 .data = &init_net.ipv4.sysctl_ip_autobind_reuse,
4b6bbf17 772 .maxlen = sizeof(u8),
4b01a967 773 .mode = 0644,
4b6bbf17 774 .proc_handler = proc_dou8vec_minmax,
4b01a967
KI		 775 .extra1 = SYSCTL_ZERO,
776 .extra2 = SYSCTL_ONE,
777 },
e110861f
LC		 778 {
779 .procname = "fwmark_reflect",
780 .data = &init_net.ipv4.sysctl_fwmark_reflect,
4b6bbf17 781 .maxlen = sizeof(u8),
e110861f 782 .mode = 0644,
4b6bbf17 783 .proc_handler = proc_dou8vec_minmax,
e110861f 784 },
84f39b08
LC		 785 {
786 .procname = "tcp_fwmark_accept",
787 .data = &init_net.ipv4.sysctl_tcp_fwmark_accept,
4ecc1baf 788 .maxlen = sizeof(u8),
84f39b08 789 .mode = 0644,
4ecc1baf 790 .proc_handler = proc_dou8vec_minmax,
84f39b08 791 },
6dd9a14e
DA		 792#ifdef CONFIG_NET_L3_MASTER_DEV
793 {
794 .procname = "tcp_l3mdev_accept",
795 .data = &init_net.ipv4.sysctl_tcp_l3mdev_accept,
4ecc1baf 796 .maxlen = sizeof(u8),
6dd9a14e 797 .mode = 0644,
4ecc1baf 798 .proc_handler = proc_dou8vec_minmax,
eec4844f
MC		 799 .extra1 = SYSCTL_ZERO,
800 .extra2 = SYSCTL_ONE,
6dd9a14e
DA		 801 },
802#endif
b0f9ca53
FD		 803 {
804 .procname = "tcp_mtu_probing",
805 .data = &init_net.ipv4.sysctl_tcp_mtu_probing,
4ecc1baf 806 .maxlen = sizeof(u8),
b0f9ca53 807 .mode = 0644,
4ecc1baf 808 .proc_handler = proc_dou8vec_minmax,
b0f9ca53
FD		 809 },
810 {
811 .procname = "tcp_base_mss",
812 .data = &init_net.ipv4.sysctl_tcp_base_mss,
813 .maxlen = sizeof(int),
814 .mode = 0644,
815 .proc_handler = proc_dointvec,
816 },
5f3e2bf0
ED		 817 {
818 .procname = "tcp_min_snd_mss",
819 .data = &init_net.ipv4.sysctl_tcp_min_snd_mss,
820 .maxlen = sizeof(int),
821 .mode = 0644,
822 .proc_handler = proc_dointvec_minmax,
823 .extra1 = &tcp_min_snd_mss_min,
824 .extra2 = &tcp_min_snd_mss_max,
825 },
c04b79b6
JH		 826 {
827 .procname = "tcp_mtu_probe_floor",
828 .data = &init_net.ipv4.sysctl_tcp_mtu_probe_floor,
829 .maxlen = sizeof(int),
830 .mode = 0644,
831 .proc_handler = proc_dointvec_minmax,
832 .extra1 = &tcp_min_snd_mss_min,
833 .extra2 = &tcp_min_snd_mss_max,
834 },
6b58e0a5
FD		 835 {
836 .procname = "tcp_probe_threshold",
837 .data = &init_net.ipv4.sysctl_tcp_probe_threshold,
838 .maxlen = sizeof(int),
839 .mode = 0644,
840 .proc_handler = proc_dointvec,
841 },
05cbc0db
FD		 842 {
843 .procname = "tcp_probe_interval",
844 .data = &init_net.ipv4.sysctl_tcp_probe_interval,
d4ce5808 845 .maxlen = sizeof(u32),
05cbc0db 846 .mode = 0644,
d4ce5808
MŻ		 847 .proc_handler = proc_douintvec_minmax,
848 .extra2 = &u32_max_div_HZ,
05cbc0db 849 },
df2cf4a7
PD		 850 {
851 .procname = "igmp_link_local_mcast_reports",
87a8a2ae 852 .data = &init_net.ipv4.sysctl_igmp_llm_reports,
7d4b37eb 853 .maxlen = sizeof(u8),
df2cf4a7 854 .mode = 0644,
7d4b37eb 855 .proc_handler = proc_dou8vec_minmax,
df2cf4a7 856 },
815c5270
NB		 857 {
858 .procname = "igmp_max_memberships",
859 .data = &init_net.ipv4.sysctl_igmp_max_memberships,
860 .maxlen = sizeof(int),
861 .mode = 0644,
862 .proc_handler = proc_dointvec
863 },
166b6b2d
NB		 864 {
865 .procname = "igmp_max_msf",
866 .data = &init_net.ipv4.sysctl_igmp_max_msf,
867 .maxlen = sizeof(int),
868 .mode = 0644,
869 .proc_handler = proc_dointvec
870 },
165094af
NB		 871#ifdef CONFIG_IP_MULTICAST
872 {
873 .procname = "igmp_qrv",
874 .data = &init_net.ipv4.sysctl_igmp_qrv,
875 .maxlen = sizeof(int),
876 .mode = 0644,
877 .proc_handler = proc_dointvec_minmax,
eec4844f 878 .extra1 = SYSCTL_ONE
165094af
NB		 879 },
880#endif
6670e152
SH		 881 {
882 .procname = "tcp_congestion_control",
883 .data = &init_net.ipv4.tcp_congestion_control,
884 .mode = 0644,
885 .maxlen = TCP_CA_NAME_MAX,
886 .proc_handler = proc_tcp_congestion_control,
887 },
9cb8e048
CB		 888 {
889 .procname = "tcp_available_congestion_control",
890 .maxlen = TCP_CA_BUF_MAX,
891 .mode = 0444,
892 .proc_handler = proc_tcp_available_congestion_control,
893 },
894 {
895 .procname = "tcp_allowed_congestion_control",
896 .maxlen = TCP_CA_BUF_MAX,
897 .mode = 0644,
898 .proc_handler = proc_allowed_congestion_control,
899 },
13b287e8
NB		 900 {
901 .procname = "tcp_keepalive_time",
902 .data = &init_net.ipv4.sysctl_tcp_keepalive_time,
903 .maxlen = sizeof(int),
904 .mode = 0644,
905 .proc_handler = proc_dointvec_jiffies,
906 },
9bd6861b
NB		 907 {
908 .procname = "tcp_keepalive_probes",
909 .data = &init_net.ipv4.sysctl_tcp_keepalive_probes,
4ecc1baf 910 .maxlen = sizeof(u8),
9bd6861b 911 .mode = 0644,
4ecc1baf 912 .proc_handler = proc_dou8vec_minmax,
9bd6861b 913 },
b840d15d
NB		 914 {
915 .procname = "tcp_keepalive_intvl",
916 .data = &init_net.ipv4.sysctl_tcp_keepalive_intvl,
917 .maxlen = sizeof(int),
918 .mode = 0644,
919 .proc_handler = proc_dointvec_jiffies,
920 },
6fa25166
NB		 921 {
922 .procname = "tcp_syn_retries",
923 .data = &init_net.ipv4.sysctl_tcp_syn_retries,
4ecc1baf 924 .maxlen = sizeof(u8),
6fa25166 925 .mode = 0644,
4ecc1baf 926 .proc_handler = proc_dou8vec_minmax,
6fa25166
NB		 927 .extra1 = &tcp_syn_retries_min,
928 .extra2 = &tcp_syn_retries_max
929 },
7c083ecb
NB		 930 {
931 .procname = "tcp_synack_retries",
932 .data = &init_net.ipv4.sysctl_tcp_synack_retries,
4ecc1baf 933 .maxlen = sizeof(u8),
7c083ecb 934 .mode = 0644,
4ecc1baf 935 .proc_handler = proc_dou8vec_minmax,
7c083ecb 936 },
12ed8244
NB		 937#ifdef CONFIG_SYN_COOKIES
938 {
939 .procname = "tcp_syncookies",
940 .data = &init_net.ipv4.sysctl_tcp_syncookies,
4ecc1baf 941 .maxlen = sizeof(u8),
12ed8244 942 .mode = 0644,
4ecc1baf 943 .proc_handler = proc_dou8vec_minmax,
12ed8244
NB		 944 },
945#endif
f9ac779f
KI		 946 {
947 .procname = "tcp_migrate_req",
948 .data = &init_net.ipv4.sysctl_tcp_migrate_req,
949 .maxlen = sizeof(u8),
950 .mode = 0644,
951 .proc_handler = proc_dou8vec_minmax,
952 .extra1 = SYSCTL_ZERO,
953 .extra2 = SYSCTL_ONE
954 },
1043e25f
NB		 955 {
956 .procname = "tcp_reordering",
957 .data = &init_net.ipv4.sysctl_tcp_reordering,
958 .maxlen = sizeof(int),
959 .mode = 0644,
960 .proc_handler = proc_dointvec
961 },
ae5c3f40
NB		 962 {
963 .procname = "tcp_retries1",
964 .data = &init_net.ipv4.sysctl_tcp_retries1,
4ecc1baf 965 .maxlen = sizeof(u8),
ae5c3f40 966 .mode = 0644,
4ecc1baf 967 .proc_handler = proc_dou8vec_minmax,
ae5c3f40
NB		 968 .extra2 = &tcp_retr1_max
969 },
c6214a97
NB		 970 {
971 .procname = "tcp_retries2",
972 .data = &init_net.ipv4.sysctl_tcp_retries2,
4ecc1baf 973 .maxlen = sizeof(u8),
c6214a97 974 .mode = 0644,
4ecc1baf 975 .proc_handler = proc_dou8vec_minmax,
c6214a97 976 },
c402d9be
NB		 977 {
978 .procname = "tcp_orphan_retries",
979 .data = &init_net.ipv4.sysctl_tcp_orphan_retries,
4ecc1baf 980 .maxlen = sizeof(u8),
c402d9be 981 .mode = 0644,
4ecc1baf 982 .proc_handler = proc_dou8vec_minmax,
c402d9be 983 },
1e579caa
NB		 984 {
985 .procname = "tcp_fin_timeout",
986 .data = &init_net.ipv4.sysctl_tcp_fin_timeout,
987 .maxlen = sizeof(int),
988 .mode = 0644,
989 .proc_handler = proc_dointvec_jiffies,
990 },
4979f2d9
NB		 991 {
992 .procname = "tcp_notsent_lowat",
993 .data = &init_net.ipv4.sysctl_tcp_notsent_lowat,
994 .maxlen = sizeof(unsigned int),
995 .mode = 0644,
b007f090 996 .proc_handler = proc_douintvec,
4979f2d9 997 },
56ab6b93
HY		 998 {
999 .procname = "tcp_tw_reuse",
1000 .data = &init_net.ipv4.sysctl_tcp_tw_reuse,
4ecc1baf 1001 .maxlen = sizeof(u8),
56ab6b93 1002 .mode = 0644,
4ecc1baf 1003 .proc_handler = proc_dou8vec_minmax,
eec4844f 1004 .extra1 = SYSCTL_ZERO,
bd8a5367 1005 .extra2 = SYSCTL_TWO,
56ab6b93 1006 },
fee83d09
HY		 1007 {
1008 .procname = "tcp_max_syn_backlog",
1009 .data = &init_net.ipv4.sysctl_max_syn_backlog,
1010 .maxlen = sizeof(int),
1011 .mode = 0644,
1012 .proc_handler = proc_dointvec
1013 },
e1cfcbe8
HY		 1014 {
1015 .procname = "tcp_fastopen",
1016 .data = &init_net.ipv4.sysctl_tcp_fastopen,
1017 .maxlen = sizeof(int),
1018 .mode = 0644,
1019 .proc_handler = proc_dointvec,
1020 },
43713848
HY		 1021 {
1022 .procname = "tcp_fastopen_key",
1023 .mode = 0600,
1024 .data = &init_net.ipv4.sysctl_tcp_fastopen,
aa1236cd
JB		 1025 /* maxlen to print the list of keys in hex (*2), with dashes
1026 * separating doublewords and a comma in between keys.
1027 */
1028 .maxlen = ((TCP_FASTOPEN_KEY_LENGTH *
1029 2 * TCP_FASTOPEN_KEY_MAX) +
1030 (TCP_FASTOPEN_KEY_MAX * 5)),
43713848
HY		 1031 .proc_handler = proc_tcp_fastopen_key,
1032 },
3733be14
HY		 1033 {
1034 .procname = "tcp_fastopen_blackhole_timeout_sec",
1035 .data = &init_net.ipv4.sysctl_tcp_fastopen_blackhole_timeout,
1036 .maxlen = sizeof(int),
1037 .mode = 0644,
1038 .proc_handler = proc_tfo_blackhole_detect_timeout,
eec4844f 1039 .extra1 = SYSCTL_ZERO,
3733be14 1040 },
a6db4494
DA		 1041#ifdef CONFIG_IP_ROUTE_MULTIPATH
1042 {
1043 .procname = "fib_multipath_use_neigh",
1044 .data = &init_net.ipv4.sysctl_fib_multipath_use_neigh,
be205fe6 1045 .maxlen = sizeof(u8),
a6db4494 1046 .mode = 0644,
be205fe6 1047 .proc_handler = proc_dou8vec_minmax,
eec4844f
MC		 1048 .extra1 = SYSCTL_ZERO,
1049 .extra2 = SYSCTL_ONE,
bf4e0a3d
NA		 1050 },
1051 {
1052 .procname = "fib_multipath_hash_policy",
1053 .data = &init_net.ipv4.sysctl_fib_multipath_hash_policy,
be205fe6 1054 .maxlen = sizeof(u8),
bf4e0a3d 1055 .mode = 0644,
3ae6ec08 1056 .proc_handler = proc_fib_multipath_hash_policy,
eec4844f 1057 .extra1 = SYSCTL_ZERO,
4c7f24f8 1058 .extra2 = SYSCTL_THREE,
a6db4494 1059 },
ce5c9c20
IS		 1060 {
1061 .procname = "fib_multipath_hash_fields",
1062 .data = &init_net.ipv4.sysctl_fib_multipath_hash_fields,
1063 .maxlen = sizeof(u32),
1064 .mode = 0644,
eb0e4d59 1065 .proc_handler = proc_fib_multipath_hash_fields,
ce5c9c20
IS		 1066 .extra1 = SYSCTL_ONE,
1067 .extra2 = &fib_multipath_hash_fields_all_mask,
1068 },
a6db4494 1069#endif
4548b683
KJ		 1070 {
1071 .procname = "ip_unprivileged_port_start",
1072 .maxlen = sizeof(int),
1073 .data = &init_net.ipv4.sysctl_ip_prot_sock,
1074 .mode = 0644,
1075 .proc_handler = ipv4_privileged_ports,
1076 },
63a6fff3
RS		 1077#ifdef CONFIG_NET_L3_MASTER_DEV
1078 {
1079 .procname = "udp_l3mdev_accept",
1080 .data = &init_net.ipv4.sysctl_udp_l3mdev_accept,
cd04bd02 1081 .maxlen = sizeof(u8),
63a6fff3 1082 .mode = 0644,
cd04bd02 1083 .proc_handler = proc_dou8vec_minmax,
eec4844f
MC		 1084 .extra1 = SYSCTL_ZERO,
1085 .extra2 = SYSCTL_ONE,
63a6fff3
RS		 1086 },
1087#endif
f9301034
ED		 1088 {
1089 .procname = "tcp_sack",
1090 .data = &init_net.ipv4.sysctl_tcp_sack,
4ecc1baf 1091 .maxlen = sizeof(u8),
f9301034 1092 .mode = 0644,
4ecc1baf 1093 .proc_handler = proc_dou8vec_minmax,
f9301034 1094 },
9bb37ef0
ED		 1095 {
1096 .procname = "tcp_window_scaling",
1097 .data = &init_net.ipv4.sysctl_tcp_window_scaling,
4ecc1baf 1098 .maxlen = sizeof(u8),
9bb37ef0 1099 .mode = 0644,
4ecc1baf 1100 .proc_handler = proc_dou8vec_minmax,
9bb37ef0 1101 },
5d2ed052
ED		 1102 {
1103 .procname = "tcp_timestamps",
1104 .data = &init_net.ipv4.sysctl_tcp_timestamps,
4ecc1baf 1105 .maxlen = sizeof(u8),
5d2ed052 1106 .mode = 0644,
4ecc1baf 1107 .proc_handler = proc_dou8vec_minmax,
5d2ed052 1108 },
2ae21cf5
ED		 1109 {
1110 .procname = "tcp_early_retrans",
1111 .data = &init_net.ipv4.sysctl_tcp_early_retrans,
4ecc1baf 1112 .maxlen = sizeof(u8),
2ae21cf5 1113 .mode = 0644,
4ecc1baf 1114 .proc_handler = proc_dou8vec_minmax,
eec4844f 1115 .extra1 = SYSCTL_ZERO,
bd8a5367 1116 .extra2 = SYSCTL_FOUR,
2ae21cf5 1117 },
e20223f1
ED		 1118 {
1119 .procname = "tcp_recovery",
1120 .data = &init_net.ipv4.sysctl_tcp_recovery,
4ecc1baf 1121 .maxlen = sizeof(u8),
e20223f1 1122 .mode = 0644,
4ecc1baf 1123 .proc_handler = proc_dou8vec_minmax,
e20223f1 1124 },
2c04ac8a
ED		 1125 {
1126 .procname = "tcp_thin_linear_timeouts",
1127 .data = &init_net.ipv4.sysctl_tcp_thin_linear_timeouts,
4ecc1baf 1128 .maxlen = sizeof(u8),
2c04ac8a 1129 .mode = 0644,
4ecc1baf 1130 .proc_handler = proc_dou8vec_minmax,
2c04ac8a 1131 },
b510f0d2
ED		 1132 {
1133 .procname = "tcp_slow_start_after_idle",
1134 .data = &init_net.ipv4.sysctl_tcp_slow_start_after_idle,
4ecc1baf 1135 .maxlen = sizeof(u8),
b510f0d2 1136 .mode = 0644,
4ecc1baf 1137 .proc_handler = proc_dou8vec_minmax,
b510f0d2 1138 },
e0a1e5b5
ED		 1139 {
1140 .procname = "tcp_retrans_collapse",
1141 .data = &init_net.ipv4.sysctl_tcp_retrans_collapse,
4ecc1baf 1142 .maxlen = sizeof(u8),
e0a1e5b5 1143 .mode = 0644,
4ecc1baf 1144 .proc_handler = proc_dou8vec_minmax,
e0a1e5b5 1145 },
3f4c7c6f
ED		 1146 {
1147 .procname = "tcp_stdurg",
1148 .data = &init_net.ipv4.sysctl_tcp_stdurg,
4ecc1baf 1149 .maxlen = sizeof(u8),
3f4c7c6f 1150 .mode = 0644,
4ecc1baf 1151 .proc_handler = proc_dou8vec_minmax,
3f4c7c6f 1152 },
625357aa
ED		 1153 {
1154 .procname = "tcp_rfc1337",
1155 .data = &init_net.ipv4.sysctl_tcp_rfc1337,
4ecc1baf 1156 .maxlen = sizeof(u8),
625357aa 1157 .mode = 0644,
4ecc1baf 1158 .proc_handler = proc_dou8vec_minmax,
625357aa 1159 },
65c9410c
ED		 1160 {
1161 .procname = "tcp_abort_on_overflow",
1162 .data = &init_net.ipv4.sysctl_tcp_abort_on_overflow,
4ecc1baf 1163 .maxlen = sizeof(u8),
65c9410c 1164 .mode = 0644,
4ecc1baf 1165 .proc_handler = proc_dou8vec_minmax,
65c9410c 1166 },
0bc65a28
ED		 1167 {
1168 .procname = "tcp_fack",
1169 .data = &init_net.ipv4.sysctl_tcp_fack,
4ecc1baf 1170 .maxlen = sizeof(u8),
0bc65a28 1171 .mode = 0644,
4ecc1baf 1172 .proc_handler = proc_dou8vec_minmax,
0bc65a28 1173 },
c6e21803
ED		 1174 {
1175 .procname = "tcp_max_reordering",
1176 .data = &init_net.ipv4.sysctl_tcp_max_reordering,
1177 .maxlen = sizeof(int),
1178 .mode = 0644,
1179 .proc_handler = proc_dointvec
1180 },
6496f6bd
ED		 1181 {
1182 .procname = "tcp_dsack",
1183 .data = &init_net.ipv4.sysctl_tcp_dsack,
4ecc1baf 1184 .maxlen = sizeof(u8),
6496f6bd 1185 .mode = 0644,
4ecc1baf 1186 .proc_handler = proc_dou8vec_minmax,
6496f6bd 1187 },
0c12654a
ED		 1188 {
1189 .procname = "tcp_app_win",
1190 .data = &init_net.ipv4.sysctl_tcp_app_win,
4ecc1baf 1191 .maxlen = sizeof(u8),
0c12654a 1192 .mode = 0644,
4ecc1baf 1193 .proc_handler = proc_dou8vec_minmax,
0c12654a 1194 },
94f0893e
ED		 1195 {
1196 .procname = "tcp_adv_win_scale",
1197 .data = &init_net.ipv4.sysctl_tcp_adv_win_scale,
1198 .maxlen = sizeof(int),
1199 .mode = 0644,
1200 .proc_handler = proc_dointvec_minmax,
1201 .extra1 = &tcp_adv_win_scale_min,
1202 .extra2 = &tcp_adv_win_scale_max,
1203 },
af9b69a7
ED		 1204 {
1205 .procname = "tcp_frto",
1206 .data = &init_net.ipv4.sysctl_tcp_frto,
4ecc1baf 1207 .maxlen = sizeof(u8),
af9b69a7 1208 .mode = 0644,
4ecc1baf 1209 .proc_handler = proc_dou8vec_minmax,
af9b69a7 1210 },
ec36e416
ED		 1211 {
1212 .procname = "tcp_no_metrics_save",
1213 .data = &init_net.ipv4.sysctl_tcp_nometrics_save,
4ecc1baf 1214 .maxlen = sizeof(u8),
ec36e416 1215 .mode = 0644,
4ecc1baf 1216 .proc_handler = proc_dou8vec_minmax,
ec36e416 1217 },
65e6d901
KYY		 1218 {
1219 .procname = "tcp_no_ssthresh_metrics_save",
1220 .data = &init_net.ipv4.sysctl_tcp_no_ssthresh_metrics_save,
4ecc1baf 1221 .maxlen = sizeof(u8),
65e6d901 1222 .mode = 0644,
4ecc1baf 1223 .proc_handler = proc_dou8vec_minmax,
65e6d901
KYY		 1224 .extra1 = SYSCTL_ZERO,
1225 .extra2 = SYSCTL_ONE,
1226 },
4540c0cf
ED		 1227 {
1228 .procname = "tcp_moderate_rcvbuf",
1229 .data = &init_net.ipv4.sysctl_tcp_moderate_rcvbuf,
4ecc1baf 1230 .maxlen = sizeof(u8),
4540c0cf 1231 .mode = 0644,
4ecc1baf 1232 .proc_handler = proc_dou8vec_minmax,
4540c0cf 1233 },
d06a9904
ED		 1234 {
1235 .procname = "tcp_tso_win_divisor",
1236 .data = &init_net.ipv4.sysctl_tcp_tso_win_divisor,
4ecc1baf 1237 .maxlen = sizeof(u8),
d06a9904 1238 .mode = 0644,
4ecc1baf 1239 .proc_handler = proc_dou8vec_minmax,
d06a9904 1240 },
ceef9ab6
ED		 1241 {
1242 .procname = "tcp_workaround_signed_windows",
1243 .data = &init_net.ipv4.sysctl_tcp_workaround_signed_windows,
4ecc1baf 1244 .maxlen = sizeof(u8),
ceef9ab6 1245 .mode = 0644,
4ecc1baf 1246 .proc_handler = proc_dou8vec_minmax,
ceef9ab6 1247 },
9184d8bb
ED		 1248 {
1249 .procname = "tcp_limit_output_bytes",
1250 .data = &init_net.ipv4.sysctl_tcp_limit_output_bytes,
1251 .maxlen = sizeof(int),
1252 .mode = 0644,
1253 .proc_handler = proc_dointvec
1254 },
b530b681
ED		 1255 {
1256 .procname = "tcp_challenge_ack_limit",
1257 .data = &init_net.ipv4.sysctl_tcp_challenge_ack_limit,
1258 .maxlen = sizeof(int),
1259 .mode = 0644,
1260 .proc_handler = proc_dointvec
1261 },
26e9596e
ED		 1262 {
1263 .procname = "tcp_min_tso_segs",
1264 .data = &init_net.ipv4.sysctl_tcp_min_tso_segs,
4ecc1baf 1265 .maxlen = sizeof(u8),
26e9596e 1266 .mode = 0644,
4ecc1baf 1267 .proc_handler = proc_dou8vec_minmax,
eec4844f 1268 .extra1 = SYSCTL_ONE,
26e9596e 1269 },
65466904
ED		 1270 {
1271 .procname = "tcp_tso_rtt_log",
1272 .data = &init_net.ipv4.sysctl_tcp_tso_rtt_log,
1273 .maxlen = sizeof(u8),
1274 .mode = 0644,
1275 .proc_handler = proc_dou8vec_minmax,
1276 },
bd239704
ED		 1277 {
1278 .procname = "tcp_min_rtt_wlen",
1279 .data = &init_net.ipv4.sysctl_tcp_min_rtt_wlen,
1280 .maxlen = sizeof(int),
1281 .mode = 0644,
19fad20d 1282 .proc_handler = proc_dointvec_minmax,
eec4844f 1283 .extra1 = SYSCTL_ZERO,
19fad20d 1284 .extra2 = &one_day_secs
bd239704 1285 },
790f00e1
ED		 1286 {
1287 .procname = "tcp_autocorking",
1288 .data = &init_net.ipv4.sysctl_tcp_autocorking,
4ecc1baf 1289 .maxlen = sizeof(u8),
790f00e1 1290 .mode = 0644,
4ecc1baf 1291 .proc_handler = proc_dou8vec_minmax,
eec4844f
MC		 1292 .extra1 = SYSCTL_ZERO,
1293 .extra2 = SYSCTL_ONE,
790f00e1 1294 },
4170ba6b
ED		 1295 {
1296 .procname = "tcp_invalid_ratelimit",
1297 .data = &init_net.ipv4.sysctl_tcp_invalid_ratelimit,
1298 .maxlen = sizeof(int),
1299 .mode = 0644,
1300 .proc_handler = proc_dointvec_ms_jiffies,
1301 },
23a7102a
ED		 1302 {
1303 .procname = "tcp_pacing_ss_ratio",
1304 .data = &init_net.ipv4.sysctl_tcp_pacing_ss_ratio,
1305 .maxlen = sizeof(int),
1306 .mode = 0644,
1307 .proc_handler = proc_dointvec_minmax,
eec4844f 1308 .extra1 = SYSCTL_ZERO,
bd8a5367 1309 .extra2 = SYSCTL_ONE_THOUSAND,
23a7102a 1310 },
c26e91f8
ED		 1311 {
1312 .procname = "tcp_pacing_ca_ratio",
1313 .data = &init_net.ipv4.sysctl_tcp_pacing_ca_ratio,
1314 .maxlen = sizeof(int),
1315 .mode = 0644,
1316 .proc_handler = proc_dointvec_minmax,
eec4844f 1317 .extra1 = SYSCTL_ZERO,
bd8a5367 1318 .extra2 = SYSCTL_ONE_THOUSAND,
c26e91f8 1319 },
356d1833
ED		 1320 {
1321 .procname = "tcp_wmem",
1322 .data = &init_net.ipv4.sysctl_tcp_wmem,
1323 .maxlen = sizeof(init_net.ipv4.sysctl_tcp_wmem),
1324 .mode = 0644,
1325 .proc_handler = proc_dointvec_minmax,
eec4844f 1326 .extra1 = SYSCTL_ONE,
356d1833
ED		 1327 },
1328 {
1329 .procname = "tcp_rmem",
1330 .data = &init_net.ipv4.sysctl_tcp_rmem,
1331 .maxlen = sizeof(init_net.ipv4.sysctl_tcp_rmem),
1332 .mode = 0644,
1333 .proc_handler = proc_dointvec_minmax,
eec4844f 1334 .extra1 = SYSCTL_ONE,
356d1833 1335 },
6d82aa24
ED		 1336 {
1337 .procname = "tcp_comp_sack_delay_ns",
1338 .data = &init_net.ipv4.sysctl_tcp_comp_sack_delay_ns,
1339 .maxlen = sizeof(unsigned long),
1340 .mode = 0644,
1341 .proc_handler = proc_doulongvec_minmax,
1342 },
a70437cc
ED		 1343 {
1344 .procname = "tcp_comp_sack_slack_ns",
1345 .data = &init_net.ipv4.sysctl_tcp_comp_sack_slack_ns,
1346 .maxlen = sizeof(unsigned long),
1347 .mode = 0644,
1348 .proc_handler = proc_doulongvec_minmax,
1349 },
9c21d2fc
ED		 1350 {
1351 .procname = "tcp_comp_sack_nr",
1352 .data = &init_net.ipv4.sysctl_tcp_comp_sack_nr,
1c3289c9 1353 .maxlen = sizeof(u8),
9c21d2fc 1354 .mode = 0644,
1c3289c9 1355 .proc_handler = proc_dou8vec_minmax,
eec4844f 1356 .extra1 = SYSCTL_ZERO,
9c21d2fc 1357 },
ac8f1710
WW		 1358 {
1359 .procname = "tcp_reflect_tos",
1360 .data = &init_net.ipv4.sysctl_tcp_reflect_tos,
4ecc1baf 1361 .maxlen = sizeof(u8),
ac8f1710 1362 .mode = 0644,
4ecc1baf 1363 .proc_handler = proc_dou8vec_minmax,
ac8f1710
WW		 1364 .extra1 = SYSCTL_ZERO,
1365 .extra2 = SYSCTL_ONE,
1366 },
1e802951
TZ		 1367 {
1368 .procname = "udp_rmem_min",
1369 .data = &init_net.ipv4.sysctl_udp_rmem_min,
1370 .maxlen = sizeof(init_net.ipv4.sysctl_udp_rmem_min),
1371 .mode = 0644,
1372 .proc_handler = proc_dointvec_minmax,
eec4844f 1373 .extra1 = SYSCTL_ONE
1e802951
TZ		 1374 },
1375 {
1376 .procname = "udp_wmem_min",
1377 .data = &init_net.ipv4.sysctl_udp_wmem_min,
1378 .maxlen = sizeof(init_net.ipv4.sysctl_udp_wmem_min),
1379 .mode = 0644,
1380 .proc_handler = proc_dointvec_minmax,
eec4844f 1381 .extra1 = SYSCTL_ONE
1e802951 1382 },
680aea08
AC		 1383 {
1384 .procname = "fib_notify_on_flag_change",
1385 .data = &init_net.ipv4.sysctl_fib_notify_on_flag_change,
b2908fac 1386 .maxlen = sizeof(u8),
680aea08 1387 .mode = 0644,
b2908fac 1388 .proc_handler = proc_dou8vec_minmax,
680aea08 1389 .extra1 = SYSCTL_ZERO,
bd8a5367 1390 .extra2 = SYSCTL_TWO,
680aea08 1391 },
68528f09
PE		 1392 { }
1393};
1394
1577519d
PE		 1395static __net_init int ipv4_sysctl_init_net(struct net *net)
1396{
68528f09
PE		 1397 struct ctl_table *table;
1398
1399 table = ipv4_net_table;
09ad9bc7 1400 if (!net_eq(net, &init_net)) {
0a6fa23d
EB		 1401 int i;
1402
68528f09 1403 table = kmemdup(table, sizeof(ipv4_net_table), GFP_KERNEL);
51456b29 1404 if (!table)
68528f09
PE		 1405 goto err_alloc;
1406
fbb82952
ED		 1407 /* skip first entry (sysctl_max_tw_buckets) */
1408 for (i = 1; i < ARRAY_SIZE(ipv4_net_table) - 1; i++) {
97684f09
JR		 1409 if (table[i].data) {
1410 /* Update the variables to point into
1411 * the current struct net
1412 */
1413 table[i].data += (void *)net - (void *)&init_net;
1414 } else {
1415 /* Entries without data pointer are global;
1416 * Make them read-only in non-init_net ns
1417 */
1418 table[i].mode &= ~0222;
1419 }
1420 }
68528f09
PE		 1421 }
1422
fbb82952
ED		 1423 table[0].data = &net->ipv4.tcp_death_row->sysctl_max_tw_buckets;
1424
ec8f23ce 1425 net->ipv4.ipv4_hdr = register_net_sysctl(net, "net/ipv4", table);
51456b29 1426 if (!net->ipv4.ipv4_hdr)
68528f09
PE		 1427 goto err_reg;
1428
122ff243
WC		 1429 net->ipv4.sysctl_local_reserved_ports = kzalloc(65536 / 8, GFP_KERNEL);
1430 if (!net->ipv4.sysctl_local_reserved_ports)
1431 goto err_ports;
1432
1577519d 1433 return 0;
68528f09 1434
122ff243
WC		 1435err_ports:
1436 unregister_net_sysctl_table(net->ipv4.ipv4_hdr);
68528f09 1437err_reg:
09ad9bc7 1438 if (!net_eq(net, &init_net))
68528f09
PE		 1439 kfree(table);
1440err_alloc:
1441 return -ENOMEM;
1577519d
PE		 1442}
1443
1444static __net_exit void ipv4_sysctl_exit_net(struct net *net)
1445{
68528f09
PE		 1446 struct ctl_table *table;
1447
122ff243 1448 kfree(net->ipv4.sysctl_local_reserved_ports);
68528f09
PE		 1449 table = net->ipv4.ipv4_hdr->ctl_table_arg;
1450 unregister_net_sysctl_table(net->ipv4.ipv4_hdr);
1451 kfree(table);
1577519d
PE		 1452}
1453
1454static __net_initdata struct pernet_operations ipv4_sysctl_ops = {
1455 .init = ipv4_sysctl_init_net,
1456 .exit = ipv4_sysctl_exit_net,
1457};
1458
3e37c3f9
PE		 1459static __init int sysctl_ipv4_init(void)
1460{
1461 struct ctl_table_header *hdr;
1462
ec8f23ce 1463 hdr = register_net_sysctl(&init_net, "net/ipv4", ipv4_table);
51456b29 1464 if (!hdr)
1577519d
PE		 1465 return -ENOMEM;
1466
1467 if (register_pernet_subsys(&ipv4_sysctl_ops)) {
5dd3df10 1468 unregister_net_sysctl_table(hdr);
1577519d
PE		 1469 return -ENOMEM;
1470 }
1471
1472 return 0;
3e37c3f9
PE		 1473}
1474
1475__initcall(sysctl_ipv4_init);
Linux 6.x block layer and io_uring tree(s)