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
23 static int tcp_retr1_max = 255;
24 static int ip_local_port_range_min[] = { 1, 1 };
25 static int ip_local_port_range_max[] = { 65535, 65535 };
26 static int tcp_adv_win_scale_min = -31;
27 static int tcp_adv_win_scale_max = 31;
28 static int tcp_app_win_max = 31;
29 static int tcp_min_snd_mss_min = TCP_MIN_SND_MSS;
30 static int tcp_min_snd_mss_max = 65535;
31 static int ip_privileged_port_min;
32 static int ip_privileged_port_max = 65535;
33 static int ip_ttl_min = 1;
34 static int ip_ttl_max = 255;
35 static int tcp_syn_retries_min = 1;
36 static int tcp_syn_retries_max = MAX_TCP_SYNCNT;
37 static int tcp_syn_linear_timeouts_max = MAX_TCP_SYNCNT;
38 static unsigned long ip_ping_group_range_min[] = { 0, 0 };
39 static unsigned long ip_ping_group_range_max[] = { GID_T_MAX, GID_T_MAX };
40 static u32 u32_max_div_HZ = UINT_MAX / HZ;
41 static int one_day_secs = 24 * 3600;
42 static u32 fib_multipath_hash_fields_all_mask __maybe_unused =
43 FIB_MULTIPATH_HASH_FIELD_ALL_MASK;
44 static unsigned int tcp_child_ehash_entries_max = 16 * 1024 * 1024;
45 static unsigned int udp_child_hash_entries_max = UDP_HTABLE_SIZE_MAX;
46 static int tcp_plb_max_rounds = 31;
47 static int tcp_plb_max_cong_thresh = 256;
48
49 /* obsolete */
50 static int sysctl_tcp_low_latency __read_mostly;
51
52 /* Update system visible IP port range */
set_local_port_range(struct net * net,int range[2])53 static void set_local_port_range(struct net *net, int range[2])
54 {
55 bool same_parity = !((range[0] ^ range[1]) & 1);
56
57 write_seqlock_bh(&net->ipv4.ip_local_ports.lock);
58 if (same_parity && !net->ipv4.ip_local_ports.warned) {
59 net->ipv4.ip_local_ports.warned = true;
60 pr_err_ratelimited("ip_local_port_range: prefer different parity for start/end values.\n");
61 }
62 net->ipv4.ip_local_ports.range[0] = range[0];
63 net->ipv4.ip_local_ports.range[1] = range[1];
64 write_sequnlock_bh(&net->ipv4.ip_local_ports.lock);
65 }
66
67 /* Validate changes from /proc interface. */
ipv4_local_port_range(struct ctl_table * table,int write,void * buffer,size_t * lenp,loff_t * ppos)68 static int ipv4_local_port_range(struct ctl_table *table, int write,
69 void *buffer, size_t *lenp, loff_t *ppos)
70 {
71 struct net *net =
72 container_of(table->data, struct net, ipv4.ip_local_ports.range);
73 int ret;
74 int range[2];
75 struct ctl_table tmp = {
76 .data = &range,
77 .maxlen = sizeof(range),
78 .mode = table->mode,
79 .extra1 = &ip_local_port_range_min,
80 .extra2 = &ip_local_port_range_max,
81 };
82
83 inet_get_local_port_range(net, &range[0], &range[1]);
84
85 ret = proc_dointvec_minmax(&tmp, write, buffer, lenp, ppos);
86
87 if (write && ret == 0) {
88 /* Ensure that the upper limit is not smaller than the lower,
89 * and that the lower does not encroach upon the privileged
90 * port limit.
91 */
92 if ((range[1] < range[0]) ||
93 (range[0] < READ_ONCE(net->ipv4.sysctl_ip_prot_sock)))
94 ret = -EINVAL;
95 else
96 set_local_port_range(net, range);
97 }
98
99 return ret;
100 }
101
102 /* Validate changes from /proc interface. */
ipv4_privileged_ports(struct ctl_table * table,int write,void * buffer,size_t * lenp,loff_t * ppos)103 static int ipv4_privileged_ports(struct ctl_table *table, int write,
104 void *buffer, size_t *lenp, loff_t *ppos)
105 {
106 struct net *net = container_of(table->data, struct net,
107 ipv4.sysctl_ip_prot_sock);
108 int ret;
109 int pports;
110 int range[2];
111 struct ctl_table tmp = {
112 .data = &pports,
113 .maxlen = sizeof(pports),
114 .mode = table->mode,
115 .extra1 = &ip_privileged_port_min,
116 .extra2 = &ip_privileged_port_max,
117 };
118
119 pports = READ_ONCE(net->ipv4.sysctl_ip_prot_sock);
120
121 ret = proc_dointvec_minmax(&tmp, write, buffer, lenp, ppos);
122
123 if (write && ret == 0) {
124 inet_get_local_port_range(net, &range[0], &range[1]);
125 /* Ensure that the local port range doesn't overlap with the
126 * privileged port range.
127 */
128 if (range[0] < pports)
129 ret = -EINVAL;
130 else
131 WRITE_ONCE(net->ipv4.sysctl_ip_prot_sock, pports);
132 }
133
134 return ret;
135 }
136
inet_get_ping_group_range_table(struct ctl_table * table,kgid_t * low,kgid_t * high)137 static void inet_get_ping_group_range_table(struct ctl_table *table, kgid_t *low, kgid_t *high)
138 {
139 kgid_t *data = table->data;
140 struct net *net =
141 container_of(table->data, struct net, ipv4.ping_group_range.range);
142 unsigned int seq;
143 do {
144 seq = read_seqbegin(&net->ipv4.ping_group_range.lock);
145
146 *low = data[0];
147 *high = data[1];
148 } while (read_seqretry(&net->ipv4.ping_group_range.lock, seq));
149 }
150
151 /* Update system visible IP port range */
set_ping_group_range(struct ctl_table * table,kgid_t low,kgid_t high)152 static void set_ping_group_range(struct ctl_table *table, kgid_t low, kgid_t high)
153 {
154 kgid_t *data = table->data;
155 struct net *net =
156 container_of(table->data, struct net, ipv4.ping_group_range.range);
157 write_seqlock(&net->ipv4.ping_group_range.lock);
158 data[0] = low;
159 data[1] = high;
160 write_sequnlock(&net->ipv4.ping_group_range.lock);
161 }
162
163 /* Validate changes from /proc interface. */
ipv4_ping_group_range(struct ctl_table * table,int write,void * buffer,size_t * lenp,loff_t * ppos)164 static int ipv4_ping_group_range(struct ctl_table *table, int write,
165 void *buffer, size_t *lenp, loff_t *ppos)
166 {
167 struct user_namespace *user_ns = current_user_ns();
168 int ret;
169 unsigned long urange[2];
170 kgid_t low, high;
171 struct ctl_table tmp = {
172 .data = &urange,
173 .maxlen = sizeof(urange),
174 .mode = table->mode,
175 .extra1 = &ip_ping_group_range_min,
176 .extra2 = &ip_ping_group_range_max,
177 };
178
179 inet_get_ping_group_range_table(table, &low, &high);
180 urange[0] = from_kgid_munged(user_ns, low);
181 urange[1] = from_kgid_munged(user_ns, high);
182 ret = proc_doulongvec_minmax(&tmp, write, buffer, lenp, ppos);
183
184 if (write && ret == 0) {
185 low = make_kgid(user_ns, urange[0]);
186 high = make_kgid(user_ns, urange[1]);
187 if (!gid_valid(low) || !gid_valid(high))
188 return -EINVAL;
189 if (urange[1] < urange[0] || gid_lt(high, low)) {
190 low = make_kgid(&init_user_ns, 1);
191 high = make_kgid(&init_user_ns, 0);
192 }
193 set_ping_group_range(table, low, high);
194 }
195
196 return ret;
197 }
198
ipv4_fwd_update_priority(struct ctl_table * table,int write,void * buffer,size_t * lenp,loff_t * ppos)199 static int ipv4_fwd_update_priority(struct ctl_table *table, int write,
200 void *buffer, size_t *lenp, loff_t *ppos)
201 {
202 struct net *net;
203 int ret;
204
205 net = container_of(table->data, struct net,
206 ipv4.sysctl_ip_fwd_update_priority);
207 ret = proc_dou8vec_minmax(table, write, buffer, lenp, ppos);
208 if (write && ret == 0)
209 call_netevent_notifiers(NETEVENT_IPV4_FWD_UPDATE_PRIORITY_UPDATE,
210 net);
211
212 return ret;
213 }
214
proc_tcp_congestion_control(struct ctl_table * ctl,int write,void * buffer,size_t * lenp,loff_t * ppos)215 static int proc_tcp_congestion_control(struct ctl_table *ctl, int write,
216 void *buffer, size_t *lenp, loff_t *ppos)
217 {
218 struct net *net = container_of(ctl->data, struct net,
219 ipv4.tcp_congestion_control);
220 char val[TCP_CA_NAME_MAX];
221 struct ctl_table tbl = {
222 .data = val,
223 .maxlen = TCP_CA_NAME_MAX,
224 };
225 int ret;
226
227 tcp_get_default_congestion_control(net, val);
228
229 ret = proc_dostring(&tbl, write, buffer, lenp, ppos);
230 if (write && ret == 0)
231 ret = tcp_set_default_congestion_control(net, val);
232 return ret;
233 }
234
proc_tcp_available_congestion_control(struct ctl_table * ctl,int write,void * buffer,size_t * lenp,loff_t * ppos)235 static int proc_tcp_available_congestion_control(struct ctl_table *ctl,
236 int write, void *buffer,
237 size_t *lenp, loff_t *ppos)
238 {
239 struct ctl_table tbl = { .maxlen = TCP_CA_BUF_MAX, };
240 int ret;
241
242 tbl.data = kmalloc(tbl.maxlen, GFP_USER);
243 if (!tbl.data)
244 return -ENOMEM;
245 tcp_get_available_congestion_control(tbl.data, TCP_CA_BUF_MAX);
246 ret = proc_dostring(&tbl, write, buffer, lenp, ppos);
247 kfree(tbl.data);
248 return ret;
249 }
250
proc_allowed_congestion_control(struct ctl_table * ctl,int write,void * buffer,size_t * lenp,loff_t * ppos)251 static int proc_allowed_congestion_control(struct ctl_table *ctl,
252 int write, void *buffer,
253 size_t *lenp, loff_t *ppos)
254 {
255 struct ctl_table tbl = { .maxlen = TCP_CA_BUF_MAX };
256 int ret;
257
258 tbl.data = kmalloc(tbl.maxlen, GFP_USER);
259 if (!tbl.data)
260 return -ENOMEM;
261
262 tcp_get_allowed_congestion_control(tbl.data, tbl.maxlen);
263 ret = proc_dostring(&tbl, write, buffer, lenp, ppos);
264 if (write && ret == 0)
265 ret = tcp_set_allowed_congestion_control(tbl.data);
266 kfree(tbl.data);
267 return ret;
268 }
269
sscanf_key(char * buf,__le32 * key)270 static int sscanf_key(char *buf, __le32 *key)
271 {
272 u32 user_key[4];
273 int i, ret = 0;
274
275 if (sscanf(buf, "%x-%x-%x-%x", user_key, user_key + 1,
276 user_key + 2, user_key + 3) != 4) {
277 ret = -EINVAL;
278 } else {
279 for (i = 0; i < ARRAY_SIZE(user_key); i++)
280 key[i] = cpu_to_le32(user_key[i]);
281 }
282 pr_debug("proc TFO key set 0x%x-%x-%x-%x <- 0x%s: %u\n",
283 user_key[0], user_key[1], user_key[2], user_key[3], buf, ret);
284
285 return ret;
286 }
287
proc_tcp_fastopen_key(struct ctl_table * table,int write,void * buffer,size_t * lenp,loff_t * ppos)288 static int proc_tcp_fastopen_key(struct ctl_table *table, int write,
289 void *buffer, size_t *lenp, loff_t *ppos)
290 {
291 struct net *net = container_of(table->data, struct net,
292 ipv4.sysctl_tcp_fastopen);
293 /* maxlen to print the list of keys in hex (*2), with dashes
294 * separating doublewords and a comma in between keys.
295 */
296 struct ctl_table tbl = { .maxlen = ((TCP_FASTOPEN_KEY_LENGTH *
297 2 * TCP_FASTOPEN_KEY_MAX) +
298 (TCP_FASTOPEN_KEY_MAX * 5)) };
299 u32 user_key[TCP_FASTOPEN_KEY_BUF_LENGTH / sizeof(u32)];
300 __le32 key[TCP_FASTOPEN_KEY_BUF_LENGTH / sizeof(__le32)];
301 char *backup_data;
302 int ret, i = 0, off = 0, n_keys;
303
304 tbl.data = kmalloc(tbl.maxlen, GFP_KERNEL);
305 if (!tbl.data)
306 return -ENOMEM;
307
308 n_keys = tcp_fastopen_get_cipher(net, NULL, (u64 *)key);
309 if (!n_keys) {
310 memset(&key[0], 0, TCP_FASTOPEN_KEY_LENGTH);
311 n_keys = 1;
312 }
313
314 for (i = 0; i < n_keys * 4; i++)
315 user_key[i] = le32_to_cpu(key[i]);
316
317 for (i = 0; i < n_keys; i++) {
318 off += snprintf(tbl.data + off, tbl.maxlen - off,
319 "%08x-%08x-%08x-%08x",
320 user_key[i * 4],
321 user_key[i * 4 + 1],
322 user_key[i * 4 + 2],
323 user_key[i * 4 + 3]);
324
325 if (WARN_ON_ONCE(off >= tbl.maxlen - 1))
326 break;
327
328 if (i + 1 < n_keys)
329 off += snprintf(tbl.data + off, tbl.maxlen - off, ",");
330 }
331
332 ret = proc_dostring(&tbl, write, buffer, lenp, ppos);
333
334 if (write && ret == 0) {
335 backup_data = strchr(tbl.data, ',');
336 if (backup_data) {
337 *backup_data = '\0';
338 backup_data++;
339 }
340 if (sscanf_key(tbl.data, key)) {
341 ret = -EINVAL;
342 goto bad_key;
343 }
344 if (backup_data) {
345 if (sscanf_key(backup_data, key + 4)) {
346 ret = -EINVAL;
347 goto bad_key;
348 }
349 }
350 tcp_fastopen_reset_cipher(net, NULL, key,
351 backup_data ? key + 4 : NULL);
352 }
353
354 bad_key:
355 kfree(tbl.data);
356 return ret;
357 }
358
proc_tfo_blackhole_detect_timeout(struct ctl_table * table,int write,void * buffer,size_t * lenp,loff_t * ppos)359 static int proc_tfo_blackhole_detect_timeout(struct ctl_table *table,
360 int write, void *buffer,
361 size_t *lenp, loff_t *ppos)
362 {
363 struct net *net = container_of(table->data, struct net,
364 ipv4.sysctl_tcp_fastopen_blackhole_timeout);
365 int ret;
366
367 ret = proc_dointvec_minmax(table, write, buffer, lenp, ppos);
368 if (write && ret == 0)
369 atomic_set(&net->ipv4.tfo_active_disable_times, 0);
370
371 return ret;
372 }
373
proc_tcp_available_ulp(struct ctl_table * ctl,int write,void * buffer,size_t * lenp,loff_t * ppos)374 static int proc_tcp_available_ulp(struct ctl_table *ctl,
375 int write, void *buffer, size_t *lenp,
376 loff_t *ppos)
377 {
378 struct ctl_table tbl = { .maxlen = TCP_ULP_BUF_MAX, };
379 int ret;
380
381 tbl.data = kmalloc(tbl.maxlen, GFP_USER);
382 if (!tbl.data)
383 return -ENOMEM;
384 tcp_get_available_ulp(tbl.data, TCP_ULP_BUF_MAX);
385 ret = proc_dostring(&tbl, write, buffer, lenp, ppos);
386 kfree(tbl.data);
387
388 return ret;
389 }
390
proc_tcp_ehash_entries(struct ctl_table * table,int write,void * buffer,size_t * lenp,loff_t * ppos)391 static int proc_tcp_ehash_entries(struct ctl_table *table, int write,
392 void *buffer, size_t *lenp, loff_t *ppos)
393 {
394 struct net *net = container_of(table->data, struct net,
395 ipv4.sysctl_tcp_child_ehash_entries);
396 struct inet_hashinfo *hinfo = net->ipv4.tcp_death_row.hashinfo;
397 int tcp_ehash_entries;
398 struct ctl_table tbl;
399
400 tcp_ehash_entries = hinfo->ehash_mask + 1;
401
402 /* A negative number indicates that the child netns
403 * shares the global ehash.
404 */
405 if (!net_eq(net, &init_net) && !hinfo->pernet)
406 tcp_ehash_entries *= -1;
407
408 memset(&tbl, 0, sizeof(tbl));
409 tbl.data = &tcp_ehash_entries;
410 tbl.maxlen = sizeof(int);
411
412 return proc_dointvec(&tbl, write, buffer, lenp, ppos);
413 }
414
proc_udp_hash_entries(struct ctl_table * table,int write,void * buffer,size_t * lenp,loff_t * ppos)415 static int proc_udp_hash_entries(struct ctl_table *table, int write,
416 void *buffer, size_t *lenp, loff_t *ppos)
417 {
418 struct net *net = container_of(table->data, struct net,
419 ipv4.sysctl_udp_child_hash_entries);
420 int udp_hash_entries;
421 struct ctl_table tbl;
422
423 udp_hash_entries = net->ipv4.udp_table->mask + 1;
424
425 /* A negative number indicates that the child netns
426 * shares the global udp_table.
427 */
428 if (!net_eq(net, &init_net) && net->ipv4.udp_table == &udp_table)
429 udp_hash_entries *= -1;
430
431 memset(&tbl, 0, sizeof(tbl));
432 tbl.data = &udp_hash_entries;
433 tbl.maxlen = sizeof(int);
434
435 return proc_dointvec(&tbl, write, buffer, lenp, ppos);
436 }
437
438 #ifdef CONFIG_IP_ROUTE_MULTIPATH
proc_fib_multipath_hash_policy(struct ctl_table * table,int write,void * buffer,size_t * lenp,loff_t * ppos)439 static int proc_fib_multipath_hash_policy(struct ctl_table *table, int write,
440 void *buffer, size_t *lenp,
441 loff_t *ppos)
442 {
443 struct net *net = container_of(table->data, struct net,
444 ipv4.sysctl_fib_multipath_hash_policy);
445 int ret;
446
447 ret = proc_dou8vec_minmax(table, write, buffer, lenp, ppos);
448 if (write && ret == 0)
449 call_netevent_notifiers(NETEVENT_IPV4_MPATH_HASH_UPDATE, net);
450
451 return ret;
452 }
453
proc_fib_multipath_hash_fields(struct ctl_table * table,int write,void * buffer,size_t * lenp,loff_t * ppos)454 static int proc_fib_multipath_hash_fields(struct ctl_table *table, int write,
455 void *buffer, size_t *lenp,
456 loff_t *ppos)
457 {
458 struct net *net;
459 int ret;
460
461 net = container_of(table->data, struct net,
462 ipv4.sysctl_fib_multipath_hash_fields);
463 ret = proc_douintvec_minmax(table, write, buffer, lenp, ppos);
464 if (write && ret == 0)
465 call_netevent_notifiers(NETEVENT_IPV4_MPATH_HASH_UPDATE, net);
466
467 return ret;
468 }
469 #endif
470
471 static struct ctl_table ipv4_table[] = {
472 {
473 .procname = "tcp_max_orphans",
474 .data = &sysctl_tcp_max_orphans,
475 .maxlen = sizeof(int),
476 .mode = 0644,
477 .proc_handler = proc_dointvec
478 },
479 {
480 .procname = "inet_peer_threshold",
481 .data = &inet_peer_threshold,
482 .maxlen = sizeof(int),
483 .mode = 0644,
484 .proc_handler = proc_dointvec
485 },
486 {
487 .procname = "inet_peer_minttl",
488 .data = &inet_peer_minttl,
489 .maxlen = sizeof(int),
490 .mode = 0644,
491 .proc_handler = proc_dointvec_jiffies,
492 },
493 {
494 .procname = "inet_peer_maxttl",
495 .data = &inet_peer_maxttl,
496 .maxlen = sizeof(int),
497 .mode = 0644,
498 .proc_handler = proc_dointvec_jiffies,
499 },
500 {
501 .procname = "tcp_mem",
502 .maxlen = sizeof(sysctl_tcp_mem),
503 .data = &sysctl_tcp_mem,
504 .mode = 0644,
505 .proc_handler = proc_doulongvec_minmax,
506 },
507 {
508 .procname = "tcp_low_latency",
509 .data = &sysctl_tcp_low_latency,
510 .maxlen = sizeof(int),
511 .mode = 0644,
512 .proc_handler = proc_dointvec
513 },
514 #ifdef CONFIG_NETLABEL
515 {
516 .procname = "cipso_cache_enable",
517 .data = &cipso_v4_cache_enabled,
518 .maxlen = sizeof(int),
519 .mode = 0644,
520 .proc_handler = proc_dointvec,
521 },
522 {
523 .procname = "cipso_cache_bucket_size",
524 .data = &cipso_v4_cache_bucketsize,
525 .maxlen = sizeof(int),
526 .mode = 0644,
527 .proc_handler = proc_dointvec,
528 },
529 {
530 .procname = "cipso_rbm_optfmt",
531 .data = &cipso_v4_rbm_optfmt,
532 .maxlen = sizeof(int),
533 .mode = 0644,
534 .proc_handler = proc_dointvec,
535 },
536 {
537 .procname = "cipso_rbm_strictvalid",
538 .data = &cipso_v4_rbm_strictvalid,
539 .maxlen = sizeof(int),
540 .mode = 0644,
541 .proc_handler = proc_dointvec,
542 },
543 #endif /* CONFIG_NETLABEL */
544 {
545 .procname = "tcp_available_ulp",
546 .maxlen = TCP_ULP_BUF_MAX,
547 .mode = 0444,
548 .proc_handler = proc_tcp_available_ulp,
549 },
550 {
551 .procname = "icmp_msgs_per_sec",
552 .data = &sysctl_icmp_msgs_per_sec,
553 .maxlen = sizeof(int),
554 .mode = 0644,
555 .proc_handler = proc_dointvec_minmax,
556 .extra1 = SYSCTL_ZERO,
557 },
558 {
559 .procname = "icmp_msgs_burst",
560 .data = &sysctl_icmp_msgs_burst,
561 .maxlen = sizeof(int),
562 .mode = 0644,
563 .proc_handler = proc_dointvec_minmax,
564 .extra1 = SYSCTL_ZERO,
565 },
566 {
567 .procname = "udp_mem",
568 .data = &sysctl_udp_mem,
569 .maxlen = sizeof(sysctl_udp_mem),
570 .mode = 0644,
571 .proc_handler = proc_doulongvec_minmax,
572 },
573 {
574 .procname = "fib_sync_mem",
575 .data = &sysctl_fib_sync_mem,
576 .maxlen = sizeof(sysctl_fib_sync_mem),
577 .mode = 0644,
578 .proc_handler = proc_douintvec_minmax,
579 .extra1 = &sysctl_fib_sync_mem_min,
580 .extra2 = &sysctl_fib_sync_mem_max,
581 },
582 { }
583 };
584
585 static struct ctl_table ipv4_net_table[] = {
586 {
587 .procname = "tcp_max_tw_buckets",
588 .data = &init_net.ipv4.tcp_death_row.sysctl_max_tw_buckets,
589 .maxlen = sizeof(int),
590 .mode = 0644,
591 .proc_handler = proc_dointvec
592 },
593 {
594 .procname = "icmp_echo_ignore_all",
595 .data = &init_net.ipv4.sysctl_icmp_echo_ignore_all,
596 .maxlen = sizeof(u8),
597 .mode = 0644,
598 .proc_handler = proc_dou8vec_minmax,
599 .extra1 = SYSCTL_ZERO,
600 .extra2 = SYSCTL_ONE
601 },
602 {
603 .procname = "icmp_echo_enable_probe",
604 .data = &init_net.ipv4.sysctl_icmp_echo_enable_probe,
605 .maxlen = sizeof(u8),
606 .mode = 0644,
607 .proc_handler = proc_dou8vec_minmax,
608 .extra1 = SYSCTL_ZERO,
609 .extra2 = SYSCTL_ONE
610 },
611 {
612 .procname = "icmp_echo_ignore_broadcasts",
613 .data = &init_net.ipv4.sysctl_icmp_echo_ignore_broadcasts,
614 .maxlen = sizeof(u8),
615 .mode = 0644,
616 .proc_handler = proc_dou8vec_minmax,
617 .extra1 = SYSCTL_ZERO,
618 .extra2 = SYSCTL_ONE
619 },
620 {
621 .procname = "icmp_ignore_bogus_error_responses",
622 .data = &init_net.ipv4.sysctl_icmp_ignore_bogus_error_responses,
623 .maxlen = sizeof(u8),
624 .mode = 0644,
625 .proc_handler = proc_dou8vec_minmax,
626 .extra1 = SYSCTL_ZERO,
627 .extra2 = SYSCTL_ONE
628 },
629 {
630 .procname = "icmp_errors_use_inbound_ifaddr",
631 .data = &init_net.ipv4.sysctl_icmp_errors_use_inbound_ifaddr,
632 .maxlen = sizeof(u8),
633 .mode = 0644,
634 .proc_handler = proc_dou8vec_minmax,
635 .extra1 = SYSCTL_ZERO,
636 .extra2 = SYSCTL_ONE
637 },
638 {
639 .procname = "icmp_ratelimit",
640 .data = &init_net.ipv4.sysctl_icmp_ratelimit,
641 .maxlen = sizeof(int),
642 .mode = 0644,
643 .proc_handler = proc_dointvec_ms_jiffies,
644 },
645 {
646 .procname = "icmp_ratemask",
647 .data = &init_net.ipv4.sysctl_icmp_ratemask,
648 .maxlen = sizeof(int),
649 .mode = 0644,
650 .proc_handler = proc_dointvec
651 },
652 {
653 .procname = "ping_group_range",
654 .data = &init_net.ipv4.ping_group_range.range,
655 .maxlen = sizeof(gid_t)*2,
656 .mode = 0644,
657 .proc_handler = ipv4_ping_group_range,
658 },
659 #ifdef CONFIG_NET_L3_MASTER_DEV
660 {
661 .procname = "raw_l3mdev_accept",
662 .data = &init_net.ipv4.sysctl_raw_l3mdev_accept,
663 .maxlen = sizeof(u8),
664 .mode = 0644,
665 .proc_handler = proc_dou8vec_minmax,
666 .extra1 = SYSCTL_ZERO,
667 .extra2 = SYSCTL_ONE,
668 },
669 #endif
670 {
671 .procname = "tcp_ecn",
672 .data = &init_net.ipv4.sysctl_tcp_ecn,
673 .maxlen = sizeof(u8),
674 .mode = 0644,
675 .proc_handler = proc_dou8vec_minmax,
676 .extra1 = SYSCTL_ZERO,
677 .extra2 = SYSCTL_TWO,
678 },
679 {
680 .procname = "tcp_ecn_fallback",
681 .data = &init_net.ipv4.sysctl_tcp_ecn_fallback,
682 .maxlen = sizeof(u8),
683 .mode = 0644,
684 .proc_handler = proc_dou8vec_minmax,
685 .extra1 = SYSCTL_ZERO,
686 .extra2 = SYSCTL_ONE,
687 },
688 {
689 .procname = "ip_dynaddr",
690 .data = &init_net.ipv4.sysctl_ip_dynaddr,
691 .maxlen = sizeof(u8),
692 .mode = 0644,
693 .proc_handler = proc_dou8vec_minmax,
694 },
695 {
696 .procname = "ip_early_demux",
697 .data = &init_net.ipv4.sysctl_ip_early_demux,
698 .maxlen = sizeof(u8),
699 .mode = 0644,
700 .proc_handler = proc_dou8vec_minmax,
701 },
702 {
703 .procname = "udp_early_demux",
704 .data = &init_net.ipv4.sysctl_udp_early_demux,
705 .maxlen = sizeof(u8),
706 .mode = 0644,
707 .proc_handler = proc_dou8vec_minmax,
708 },
709 {
710 .procname = "tcp_early_demux",
711 .data = &init_net.ipv4.sysctl_tcp_early_demux,
712 .maxlen = sizeof(u8),
713 .mode = 0644,
714 .proc_handler = proc_dou8vec_minmax,
715 },
716 {
717 .procname = "nexthop_compat_mode",
718 .data = &init_net.ipv4.sysctl_nexthop_compat_mode,
719 .maxlen = sizeof(u8),
720 .mode = 0644,
721 .proc_handler = proc_dou8vec_minmax,
722 .extra1 = SYSCTL_ZERO,
723 .extra2 = SYSCTL_ONE,
724 },
725 {
726 .procname = "ip_default_ttl",
727 .data = &init_net.ipv4.sysctl_ip_default_ttl,
728 .maxlen = sizeof(u8),
729 .mode = 0644,
730 .proc_handler = proc_dou8vec_minmax,
731 .extra1 = &ip_ttl_min,
732 .extra2 = &ip_ttl_max,
733 },
734 {
735 .procname = "ip_local_port_range",
736 .maxlen = sizeof(init_net.ipv4.ip_local_ports.range),
737 .data = &init_net.ipv4.ip_local_ports.range,
738 .mode = 0644,
739 .proc_handler = ipv4_local_port_range,
740 },
741 {
742 .procname = "ip_local_reserved_ports",
743 .data = &init_net.ipv4.sysctl_local_reserved_ports,
744 .maxlen = 65536,
745 .mode = 0644,
746 .proc_handler = proc_do_large_bitmap,
747 },
748 {
749 .procname = "ip_no_pmtu_disc",
750 .data = &init_net.ipv4.sysctl_ip_no_pmtu_disc,
751 .maxlen = sizeof(u8),
752 .mode = 0644,
753 .proc_handler = proc_dou8vec_minmax,
754 },
755 {
756 .procname = "ip_forward_use_pmtu",
757 .data = &init_net.ipv4.sysctl_ip_fwd_use_pmtu,
758 .maxlen = sizeof(u8),
759 .mode = 0644,
760 .proc_handler = proc_dou8vec_minmax,
761 },
762 {
763 .procname = "ip_forward_update_priority",
764 .data = &init_net.ipv4.sysctl_ip_fwd_update_priority,
765 .maxlen = sizeof(u8),
766 .mode = 0644,
767 .proc_handler = ipv4_fwd_update_priority,
768 .extra1 = SYSCTL_ZERO,
769 .extra2 = SYSCTL_ONE,
770 },
771 {
772 .procname = "ip_nonlocal_bind",
773 .data = &init_net.ipv4.sysctl_ip_nonlocal_bind,
774 .maxlen = sizeof(u8),
775 .mode = 0644,
776 .proc_handler = proc_dou8vec_minmax,
777 },
778 {
779 .procname = "ip_autobind_reuse",
780 .data = &init_net.ipv4.sysctl_ip_autobind_reuse,
781 .maxlen = sizeof(u8),
782 .mode = 0644,
783 .proc_handler = proc_dou8vec_minmax,
784 .extra1 = SYSCTL_ZERO,
785 .extra2 = SYSCTL_ONE,
786 },
787 {
788 .procname = "fwmark_reflect",
789 .data = &init_net.ipv4.sysctl_fwmark_reflect,
790 .maxlen = sizeof(u8),
791 .mode = 0644,
792 .proc_handler = proc_dou8vec_minmax,
793 },
794 {
795 .procname = "tcp_fwmark_accept",
796 .data = &init_net.ipv4.sysctl_tcp_fwmark_accept,
797 .maxlen = sizeof(u8),
798 .mode = 0644,
799 .proc_handler = proc_dou8vec_minmax,
800 },
801 #ifdef CONFIG_NET_L3_MASTER_DEV
802 {
803 .procname = "tcp_l3mdev_accept",
804 .data = &init_net.ipv4.sysctl_tcp_l3mdev_accept,
805 .maxlen = sizeof(u8),
806 .mode = 0644,
807 .proc_handler = proc_dou8vec_minmax,
808 .extra1 = SYSCTL_ZERO,
809 .extra2 = SYSCTL_ONE,
810 },
811 #endif
812 {
813 .procname = "tcp_mtu_probing",
814 .data = &init_net.ipv4.sysctl_tcp_mtu_probing,
815 .maxlen = sizeof(u8),
816 .mode = 0644,
817 .proc_handler = proc_dou8vec_minmax,
818 },
819 {
820 .procname = "tcp_base_mss",
821 .data = &init_net.ipv4.sysctl_tcp_base_mss,
822 .maxlen = sizeof(int),
823 .mode = 0644,
824 .proc_handler = proc_dointvec,
825 },
826 {
827 .procname = "tcp_min_snd_mss",
828 .data = &init_net.ipv4.sysctl_tcp_min_snd_mss,
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 },
835 {
836 .procname = "tcp_mtu_probe_floor",
837 .data = &init_net.ipv4.sysctl_tcp_mtu_probe_floor,
838 .maxlen = sizeof(int),
839 .mode = 0644,
840 .proc_handler = proc_dointvec_minmax,
841 .extra1 = &tcp_min_snd_mss_min,
842 .extra2 = &tcp_min_snd_mss_max,
843 },
844 {
845 .procname = "tcp_probe_threshold",
846 .data = &init_net.ipv4.sysctl_tcp_probe_threshold,
847 .maxlen = sizeof(int),
848 .mode = 0644,
849 .proc_handler = proc_dointvec,
850 },
851 {
852 .procname = "tcp_probe_interval",
853 .data = &init_net.ipv4.sysctl_tcp_probe_interval,
854 .maxlen = sizeof(u32),
855 .mode = 0644,
856 .proc_handler = proc_douintvec_minmax,
857 .extra2 = &u32_max_div_HZ,
858 },
859 {
860 .procname = "igmp_link_local_mcast_reports",
861 .data = &init_net.ipv4.sysctl_igmp_llm_reports,
862 .maxlen = sizeof(u8),
863 .mode = 0644,
864 .proc_handler = proc_dou8vec_minmax,
865 },
866 {
867 .procname = "igmp_max_memberships",
868 .data = &init_net.ipv4.sysctl_igmp_max_memberships,
869 .maxlen = sizeof(int),
870 .mode = 0644,
871 .proc_handler = proc_dointvec
872 },
873 {
874 .procname = "igmp_max_msf",
875 .data = &init_net.ipv4.sysctl_igmp_max_msf,
876 .maxlen = sizeof(int),
877 .mode = 0644,
878 .proc_handler = proc_dointvec
879 },
880 #ifdef CONFIG_IP_MULTICAST
881 {
882 .procname = "igmp_qrv",
883 .data = &init_net.ipv4.sysctl_igmp_qrv,
884 .maxlen = sizeof(int),
885 .mode = 0644,
886 .proc_handler = proc_dointvec_minmax,
887 .extra1 = SYSCTL_ONE
888 },
889 #endif
890 {
891 .procname = "tcp_congestion_control",
892 .data = &init_net.ipv4.tcp_congestion_control,
893 .mode = 0644,
894 .maxlen = TCP_CA_NAME_MAX,
895 .proc_handler = proc_tcp_congestion_control,
896 },
897 {
898 .procname = "tcp_available_congestion_control",
899 .maxlen = TCP_CA_BUF_MAX,
900 .mode = 0444,
901 .proc_handler = proc_tcp_available_congestion_control,
902 },
903 {
904 .procname = "tcp_allowed_congestion_control",
905 .maxlen = TCP_CA_BUF_MAX,
906 .mode = 0644,
907 .proc_handler = proc_allowed_congestion_control,
908 },
909 {
910 .procname = "tcp_keepalive_time",
911 .data = &init_net.ipv4.sysctl_tcp_keepalive_time,
912 .maxlen = sizeof(int),
913 .mode = 0644,
914 .proc_handler = proc_dointvec_jiffies,
915 },
916 {
917 .procname = "tcp_keepalive_probes",
918 .data = &init_net.ipv4.sysctl_tcp_keepalive_probes,
919 .maxlen = sizeof(u8),
920 .mode = 0644,
921 .proc_handler = proc_dou8vec_minmax,
922 },
923 {
924 .procname = "tcp_keepalive_intvl",
925 .data = &init_net.ipv4.sysctl_tcp_keepalive_intvl,
926 .maxlen = sizeof(int),
927 .mode = 0644,
928 .proc_handler = proc_dointvec_jiffies,
929 },
930 {
931 .procname = "tcp_syn_retries",
932 .data = &init_net.ipv4.sysctl_tcp_syn_retries,
933 .maxlen = sizeof(u8),
934 .mode = 0644,
935 .proc_handler = proc_dou8vec_minmax,
936 .extra1 = &tcp_syn_retries_min,
937 .extra2 = &tcp_syn_retries_max
938 },
939 {
940 .procname = "tcp_synack_retries",
941 .data = &init_net.ipv4.sysctl_tcp_synack_retries,
942 .maxlen = sizeof(u8),
943 .mode = 0644,
944 .proc_handler = proc_dou8vec_minmax,
945 },
946 #ifdef CONFIG_SYN_COOKIES
947 {
948 .procname = "tcp_syncookies",
949 .data = &init_net.ipv4.sysctl_tcp_syncookies,
950 .maxlen = sizeof(u8),
951 .mode = 0644,
952 .proc_handler = proc_dou8vec_minmax,
953 },
954 #endif
955 {
956 .procname = "tcp_migrate_req",
957 .data = &init_net.ipv4.sysctl_tcp_migrate_req,
958 .maxlen = sizeof(u8),
959 .mode = 0644,
960 .proc_handler = proc_dou8vec_minmax,
961 .extra1 = SYSCTL_ZERO,
962 .extra2 = SYSCTL_ONE
963 },
964 {
965 .procname = "tcp_reordering",
966 .data = &init_net.ipv4.sysctl_tcp_reordering,
967 .maxlen = sizeof(int),
968 .mode = 0644,
969 .proc_handler = proc_dointvec
970 },
971 {
972 .procname = "tcp_retries1",
973 .data = &init_net.ipv4.sysctl_tcp_retries1,
974 .maxlen = sizeof(u8),
975 .mode = 0644,
976 .proc_handler = proc_dou8vec_minmax,
977 .extra2 = &tcp_retr1_max
978 },
979 {
980 .procname = "tcp_retries2",
981 .data = &init_net.ipv4.sysctl_tcp_retries2,
982 .maxlen = sizeof(u8),
983 .mode = 0644,
984 .proc_handler = proc_dou8vec_minmax,
985 },
986 {
987 .procname = "tcp_orphan_retries",
988 .data = &init_net.ipv4.sysctl_tcp_orphan_retries,
989 .maxlen = sizeof(u8),
990 .mode = 0644,
991 .proc_handler = proc_dou8vec_minmax,
992 },
993 {
994 .procname = "tcp_fin_timeout",
995 .data = &init_net.ipv4.sysctl_tcp_fin_timeout,
996 .maxlen = sizeof(int),
997 .mode = 0644,
998 .proc_handler = proc_dointvec_jiffies,
999 },
1000 {
1001 .procname = "tcp_notsent_lowat",
1002 .data = &init_net.ipv4.sysctl_tcp_notsent_lowat,
1003 .maxlen = sizeof(unsigned int),
1004 .mode = 0644,
1005 .proc_handler = proc_douintvec,
1006 },
1007 {
1008 .procname = "tcp_tw_reuse",
1009 .data = &init_net.ipv4.sysctl_tcp_tw_reuse,
1010 .maxlen = sizeof(u8),
1011 .mode = 0644,
1012 .proc_handler = proc_dou8vec_minmax,
1013 .extra1 = SYSCTL_ZERO,
1014 .extra2 = SYSCTL_TWO,
1015 },
1016 {
1017 .procname = "tcp_max_syn_backlog",
1018 .data = &init_net.ipv4.sysctl_max_syn_backlog,
1019 .maxlen = sizeof(int),
1020 .mode = 0644,
1021 .proc_handler = proc_dointvec
1022 },
1023 {
1024 .procname = "tcp_fastopen",
1025 .data = &init_net.ipv4.sysctl_tcp_fastopen,
1026 .maxlen = sizeof(int),
1027 .mode = 0644,
1028 .proc_handler = proc_dointvec,
1029 },
1030 {
1031 .procname = "tcp_fastopen_key",
1032 .mode = 0600,
1033 .data = &init_net.ipv4.sysctl_tcp_fastopen,
1034 /* maxlen to print the list of keys in hex (*2), with dashes
1035 * separating doublewords and a comma in between keys.
1036 */
1037 .maxlen = ((TCP_FASTOPEN_KEY_LENGTH *
1038 2 * TCP_FASTOPEN_KEY_MAX) +
1039 (TCP_FASTOPEN_KEY_MAX * 5)),
1040 .proc_handler = proc_tcp_fastopen_key,
1041 },
1042 {
1043 .procname = "tcp_fastopen_blackhole_timeout_sec",
1044 .data = &init_net.ipv4.sysctl_tcp_fastopen_blackhole_timeout,
1045 .maxlen = sizeof(int),
1046 .mode = 0644,
1047 .proc_handler = proc_tfo_blackhole_detect_timeout,
1048 .extra1 = SYSCTL_ZERO,
1049 },
1050 #ifdef CONFIG_IP_ROUTE_MULTIPATH
1051 {
1052 .procname = "fib_multipath_use_neigh",
1053 .data = &init_net.ipv4.sysctl_fib_multipath_use_neigh,
1054 .maxlen = sizeof(u8),
1055 .mode = 0644,
1056 .proc_handler = proc_dou8vec_minmax,
1057 .extra1 = SYSCTL_ZERO,
1058 .extra2 = SYSCTL_ONE,
1059 },
1060 {
1061 .procname = "fib_multipath_hash_policy",
1062 .data = &init_net.ipv4.sysctl_fib_multipath_hash_policy,
1063 .maxlen = sizeof(u8),
1064 .mode = 0644,
1065 .proc_handler = proc_fib_multipath_hash_policy,
1066 .extra1 = SYSCTL_ZERO,
1067 .extra2 = SYSCTL_THREE,
1068 },
1069 {
1070 .procname = "fib_multipath_hash_fields",
1071 .data = &init_net.ipv4.sysctl_fib_multipath_hash_fields,
1072 .maxlen = sizeof(u32),
1073 .mode = 0644,
1074 .proc_handler = proc_fib_multipath_hash_fields,
1075 .extra1 = SYSCTL_ONE,
1076 .extra2 = &fib_multipath_hash_fields_all_mask,
1077 },
1078 #endif
1079 {
1080 .procname = "ip_unprivileged_port_start",
1081 .maxlen = sizeof(int),
1082 .data = &init_net.ipv4.sysctl_ip_prot_sock,
1083 .mode = 0644,
1084 .proc_handler = ipv4_privileged_ports,
1085 },
1086 #ifdef CONFIG_NET_L3_MASTER_DEV
1087 {
1088 .procname = "udp_l3mdev_accept",
1089 .data = &init_net.ipv4.sysctl_udp_l3mdev_accept,
1090 .maxlen = sizeof(u8),
1091 .mode = 0644,
1092 .proc_handler = proc_dou8vec_minmax,
1093 .extra1 = SYSCTL_ZERO,
1094 .extra2 = SYSCTL_ONE,
1095 },
1096 #endif
1097 {
1098 .procname = "tcp_sack",
1099 .data = &init_net.ipv4.sysctl_tcp_sack,
1100 .maxlen = sizeof(u8),
1101 .mode = 0644,
1102 .proc_handler = proc_dou8vec_minmax,
1103 },
1104 {
1105 .procname = "tcp_window_scaling",
1106 .data = &init_net.ipv4.sysctl_tcp_window_scaling,
1107 .maxlen = sizeof(u8),
1108 .mode = 0644,
1109 .proc_handler = proc_dou8vec_minmax,
1110 },
1111 {
1112 .procname = "tcp_timestamps",
1113 .data = &init_net.ipv4.sysctl_tcp_timestamps,
1114 .maxlen = sizeof(u8),
1115 .mode = 0644,
1116 .proc_handler = proc_dou8vec_minmax,
1117 },
1118 {
1119 .procname = "tcp_early_retrans",
1120 .data = &init_net.ipv4.sysctl_tcp_early_retrans,
1121 .maxlen = sizeof(u8),
1122 .mode = 0644,
1123 .proc_handler = proc_dou8vec_minmax,
1124 .extra1 = SYSCTL_ZERO,
1125 .extra2 = SYSCTL_FOUR,
1126 },
1127 {
1128 .procname = "tcp_recovery",
1129 .data = &init_net.ipv4.sysctl_tcp_recovery,
1130 .maxlen = sizeof(u8),
1131 .mode = 0644,
1132 .proc_handler = proc_dou8vec_minmax,
1133 },
1134 {
1135 .procname = "tcp_thin_linear_timeouts",
1136 .data = &init_net.ipv4.sysctl_tcp_thin_linear_timeouts,
1137 .maxlen = sizeof(u8),
1138 .mode = 0644,
1139 .proc_handler = proc_dou8vec_minmax,
1140 },
1141 {
1142 .procname = "tcp_slow_start_after_idle",
1143 .data = &init_net.ipv4.sysctl_tcp_slow_start_after_idle,
1144 .maxlen = sizeof(u8),
1145 .mode = 0644,
1146 .proc_handler = proc_dou8vec_minmax,
1147 },
1148 {
1149 .procname = "tcp_retrans_collapse",
1150 .data = &init_net.ipv4.sysctl_tcp_retrans_collapse,
1151 .maxlen = sizeof(u8),
1152 .mode = 0644,
1153 .proc_handler = proc_dou8vec_minmax,
1154 },
1155 {
1156 .procname = "tcp_stdurg",
1157 .data = &init_net.ipv4.sysctl_tcp_stdurg,
1158 .maxlen = sizeof(u8),
1159 .mode = 0644,
1160 .proc_handler = proc_dou8vec_minmax,
1161 },
1162 {
1163 .procname = "tcp_rfc1337",
1164 .data = &init_net.ipv4.sysctl_tcp_rfc1337,
1165 .maxlen = sizeof(u8),
1166 .mode = 0644,
1167 .proc_handler = proc_dou8vec_minmax,
1168 },
1169 {
1170 .procname = "tcp_abort_on_overflow",
1171 .data = &init_net.ipv4.sysctl_tcp_abort_on_overflow,
1172 .maxlen = sizeof(u8),
1173 .mode = 0644,
1174 .proc_handler = proc_dou8vec_minmax,
1175 },
1176 {
1177 .procname = "tcp_fack",
1178 .data = &init_net.ipv4.sysctl_tcp_fack,
1179 .maxlen = sizeof(u8),
1180 .mode = 0644,
1181 .proc_handler = proc_dou8vec_minmax,
1182 },
1183 {
1184 .procname = "tcp_max_reordering",
1185 .data = &init_net.ipv4.sysctl_tcp_max_reordering,
1186 .maxlen = sizeof(int),
1187 .mode = 0644,
1188 .proc_handler = proc_dointvec
1189 },
1190 {
1191 .procname = "tcp_dsack",
1192 .data = &init_net.ipv4.sysctl_tcp_dsack,
1193 .maxlen = sizeof(u8),
1194 .mode = 0644,
1195 .proc_handler = proc_dou8vec_minmax,
1196 },
1197 {
1198 .procname = "tcp_app_win",
1199 .data = &init_net.ipv4.sysctl_tcp_app_win,
1200 .maxlen = sizeof(u8),
1201 .mode = 0644,
1202 .proc_handler = proc_dou8vec_minmax,
1203 .extra1 = SYSCTL_ZERO,
1204 .extra2 = &tcp_app_win_max,
1205 },
1206 {
1207 .procname = "tcp_adv_win_scale",
1208 .data = &init_net.ipv4.sysctl_tcp_adv_win_scale,
1209 .maxlen = sizeof(int),
1210 .mode = 0644,
1211 .proc_handler = proc_dointvec_minmax,
1212 .extra1 = &tcp_adv_win_scale_min,
1213 .extra2 = &tcp_adv_win_scale_max,
1214 },
1215 {
1216 .procname = "tcp_frto",
1217 .data = &init_net.ipv4.sysctl_tcp_frto,
1218 .maxlen = sizeof(u8),
1219 .mode = 0644,
1220 .proc_handler = proc_dou8vec_minmax,
1221 },
1222 {
1223 .procname = "tcp_no_metrics_save",
1224 .data = &init_net.ipv4.sysctl_tcp_nometrics_save,
1225 .maxlen = sizeof(u8),
1226 .mode = 0644,
1227 .proc_handler = proc_dou8vec_minmax,
1228 },
1229 {
1230 .procname = "tcp_no_ssthresh_metrics_save",
1231 .data = &init_net.ipv4.sysctl_tcp_no_ssthresh_metrics_save,
1232 .maxlen = sizeof(u8),
1233 .mode = 0644,
1234 .proc_handler = proc_dou8vec_minmax,
1235 .extra1 = SYSCTL_ZERO,
1236 .extra2 = SYSCTL_ONE,
1237 },
1238 {
1239 .procname = "tcp_moderate_rcvbuf",
1240 .data = &init_net.ipv4.sysctl_tcp_moderate_rcvbuf,
1241 .maxlen = sizeof(u8),
1242 .mode = 0644,
1243 .proc_handler = proc_dou8vec_minmax,
1244 },
1245 {
1246 .procname = "tcp_tso_win_divisor",
1247 .data = &init_net.ipv4.sysctl_tcp_tso_win_divisor,
1248 .maxlen = sizeof(u8),
1249 .mode = 0644,
1250 .proc_handler = proc_dou8vec_minmax,
1251 },
1252 {
1253 .procname = "tcp_workaround_signed_windows",
1254 .data = &init_net.ipv4.sysctl_tcp_workaround_signed_windows,
1255 .maxlen = sizeof(u8),
1256 .mode = 0644,
1257 .proc_handler = proc_dou8vec_minmax,
1258 },
1259 {
1260 .procname = "tcp_limit_output_bytes",
1261 .data = &init_net.ipv4.sysctl_tcp_limit_output_bytes,
1262 .maxlen = sizeof(int),
1263 .mode = 0644,
1264 .proc_handler = proc_dointvec
1265 },
1266 {
1267 .procname = "tcp_challenge_ack_limit",
1268 .data = &init_net.ipv4.sysctl_tcp_challenge_ack_limit,
1269 .maxlen = sizeof(int),
1270 .mode = 0644,
1271 .proc_handler = proc_dointvec
1272 },
1273 {
1274 .procname = "tcp_min_tso_segs",
1275 .data = &init_net.ipv4.sysctl_tcp_min_tso_segs,
1276 .maxlen = sizeof(u8),
1277 .mode = 0644,
1278 .proc_handler = proc_dou8vec_minmax,
1279 .extra1 = SYSCTL_ONE,
1280 },
1281 {
1282 .procname = "tcp_tso_rtt_log",
1283 .data = &init_net.ipv4.sysctl_tcp_tso_rtt_log,
1284 .maxlen = sizeof(u8),
1285 .mode = 0644,
1286 .proc_handler = proc_dou8vec_minmax,
1287 },
1288 {
1289 .procname = "tcp_min_rtt_wlen",
1290 .data = &init_net.ipv4.sysctl_tcp_min_rtt_wlen,
1291 .maxlen = sizeof(int),
1292 .mode = 0644,
1293 .proc_handler = proc_dointvec_minmax,
1294 .extra1 = SYSCTL_ZERO,
1295 .extra2 = &one_day_secs
1296 },
1297 {
1298 .procname = "tcp_autocorking",
1299 .data = &init_net.ipv4.sysctl_tcp_autocorking,
1300 .maxlen = sizeof(u8),
1301 .mode = 0644,
1302 .proc_handler = proc_dou8vec_minmax,
1303 .extra1 = SYSCTL_ZERO,
1304 .extra2 = SYSCTL_ONE,
1305 },
1306 {
1307 .procname = "tcp_invalid_ratelimit",
1308 .data = &init_net.ipv4.sysctl_tcp_invalid_ratelimit,
1309 .maxlen = sizeof(int),
1310 .mode = 0644,
1311 .proc_handler = proc_dointvec_ms_jiffies,
1312 },
1313 {
1314 .procname = "tcp_pacing_ss_ratio",
1315 .data = &init_net.ipv4.sysctl_tcp_pacing_ss_ratio,
1316 .maxlen = sizeof(int),
1317 .mode = 0644,
1318 .proc_handler = proc_dointvec_minmax,
1319 .extra1 = SYSCTL_ZERO,
1320 .extra2 = SYSCTL_ONE_THOUSAND,
1321 },
1322 {
1323 .procname = "tcp_pacing_ca_ratio",
1324 .data = &init_net.ipv4.sysctl_tcp_pacing_ca_ratio,
1325 .maxlen = sizeof(int),
1326 .mode = 0644,
1327 .proc_handler = proc_dointvec_minmax,
1328 .extra1 = SYSCTL_ZERO,
1329 .extra2 = SYSCTL_ONE_THOUSAND,
1330 },
1331 {
1332 .procname = "tcp_wmem",
1333 .data = &init_net.ipv4.sysctl_tcp_wmem,
1334 .maxlen = sizeof(init_net.ipv4.sysctl_tcp_wmem),
1335 .mode = 0644,
1336 .proc_handler = proc_dointvec_minmax,
1337 .extra1 = SYSCTL_ONE,
1338 },
1339 {
1340 .procname = "tcp_rmem",
1341 .data = &init_net.ipv4.sysctl_tcp_rmem,
1342 .maxlen = sizeof(init_net.ipv4.sysctl_tcp_rmem),
1343 .mode = 0644,
1344 .proc_handler = proc_dointvec_minmax,
1345 .extra1 = SYSCTL_ONE,
1346 },
1347 {
1348 .procname = "tcp_comp_sack_delay_ns",
1349 .data = &init_net.ipv4.sysctl_tcp_comp_sack_delay_ns,
1350 .maxlen = sizeof(unsigned long),
1351 .mode = 0644,
1352 .proc_handler = proc_doulongvec_minmax,
1353 },
1354 {
1355 .procname = "tcp_comp_sack_slack_ns",
1356 .data = &init_net.ipv4.sysctl_tcp_comp_sack_slack_ns,
1357 .maxlen = sizeof(unsigned long),
1358 .mode = 0644,
1359 .proc_handler = proc_doulongvec_minmax,
1360 },
1361 {
1362 .procname = "tcp_comp_sack_nr",
1363 .data = &init_net.ipv4.sysctl_tcp_comp_sack_nr,
1364 .maxlen = sizeof(u8),
1365 .mode = 0644,
1366 .proc_handler = proc_dou8vec_minmax,
1367 .extra1 = SYSCTL_ZERO,
1368 },
1369 {
1370 .procname = "tcp_reflect_tos",
1371 .data = &init_net.ipv4.sysctl_tcp_reflect_tos,
1372 .maxlen = sizeof(u8),
1373 .mode = 0644,
1374 .proc_handler = proc_dou8vec_minmax,
1375 .extra1 = SYSCTL_ZERO,
1376 .extra2 = SYSCTL_ONE,
1377 },
1378 {
1379 .procname = "tcp_ehash_entries",
1380 .data = &init_net.ipv4.sysctl_tcp_child_ehash_entries,
1381 .mode = 0444,
1382 .proc_handler = proc_tcp_ehash_entries,
1383 },
1384 {
1385 .procname = "tcp_child_ehash_entries",
1386 .data = &init_net.ipv4.sysctl_tcp_child_ehash_entries,
1387 .maxlen = sizeof(unsigned int),
1388 .mode = 0644,
1389 .proc_handler = proc_douintvec_minmax,
1390 .extra1 = SYSCTL_ZERO,
1391 .extra2 = &tcp_child_ehash_entries_max,
1392 },
1393 {
1394 .procname = "udp_hash_entries",
1395 .data = &init_net.ipv4.sysctl_udp_child_hash_entries,
1396 .mode = 0444,
1397 .proc_handler = proc_udp_hash_entries,
1398 },
1399 {
1400 .procname = "udp_child_hash_entries",
1401 .data = &init_net.ipv4.sysctl_udp_child_hash_entries,
1402 .maxlen = sizeof(unsigned int),
1403 .mode = 0644,
1404 .proc_handler = proc_douintvec_minmax,
1405 .extra1 = SYSCTL_ZERO,
1406 .extra2 = &udp_child_hash_entries_max,
1407 },
1408 {
1409 .procname = "udp_rmem_min",
1410 .data = &init_net.ipv4.sysctl_udp_rmem_min,
1411 .maxlen = sizeof(init_net.ipv4.sysctl_udp_rmem_min),
1412 .mode = 0644,
1413 .proc_handler = proc_dointvec_minmax,
1414 .extra1 = SYSCTL_ONE
1415 },
1416 {
1417 .procname = "udp_wmem_min",
1418 .data = &init_net.ipv4.sysctl_udp_wmem_min,
1419 .maxlen = sizeof(init_net.ipv4.sysctl_udp_wmem_min),
1420 .mode = 0644,
1421 .proc_handler = proc_dointvec_minmax,
1422 .extra1 = SYSCTL_ONE
1423 },
1424 {
1425 .procname = "fib_notify_on_flag_change",
1426 .data = &init_net.ipv4.sysctl_fib_notify_on_flag_change,
1427 .maxlen = sizeof(u8),
1428 .mode = 0644,
1429 .proc_handler = proc_dou8vec_minmax,
1430 .extra1 = SYSCTL_ZERO,
1431 .extra2 = SYSCTL_TWO,
1432 },
1433 {
1434 .procname = "tcp_plb_enabled",
1435 .data = &init_net.ipv4.sysctl_tcp_plb_enabled,
1436 .maxlen = sizeof(u8),
1437 .mode = 0644,
1438 .proc_handler = proc_dou8vec_minmax,
1439 .extra1 = SYSCTL_ZERO,
1440 .extra2 = SYSCTL_ONE,
1441 },
1442 {
1443 .procname = "tcp_plb_idle_rehash_rounds",
1444 .data = &init_net.ipv4.sysctl_tcp_plb_idle_rehash_rounds,
1445 .maxlen = sizeof(u8),
1446 .mode = 0644,
1447 .proc_handler = proc_dou8vec_minmax,
1448 .extra2 = &tcp_plb_max_rounds,
1449 },
1450 {
1451 .procname = "tcp_plb_rehash_rounds",
1452 .data = &init_net.ipv4.sysctl_tcp_plb_rehash_rounds,
1453 .maxlen = sizeof(u8),
1454 .mode = 0644,
1455 .proc_handler = proc_dou8vec_minmax,
1456 .extra2 = &tcp_plb_max_rounds,
1457 },
1458 {
1459 .procname = "tcp_plb_suspend_rto_sec",
1460 .data = &init_net.ipv4.sysctl_tcp_plb_suspend_rto_sec,
1461 .maxlen = sizeof(u8),
1462 .mode = 0644,
1463 .proc_handler = proc_dou8vec_minmax,
1464 },
1465 {
1466 .procname = "tcp_plb_cong_thresh",
1467 .data = &init_net.ipv4.sysctl_tcp_plb_cong_thresh,
1468 .maxlen = sizeof(int),
1469 .mode = 0644,
1470 .proc_handler = proc_dointvec_minmax,
1471 .extra1 = SYSCTL_ZERO,
1472 .extra2 = &tcp_plb_max_cong_thresh,
1473 },
1474 {
1475 .procname = "tcp_syn_linear_timeouts",
1476 .data = &init_net.ipv4.sysctl_tcp_syn_linear_timeouts,
1477 .maxlen = sizeof(u8),
1478 .mode = 0644,
1479 .proc_handler = proc_dou8vec_minmax,
1480 .extra1 = SYSCTL_ZERO,
1481 .extra2 = &tcp_syn_linear_timeouts_max,
1482 },
1483 {
1484 .procname = "tcp_shrink_window",
1485 .data = &init_net.ipv4.sysctl_tcp_shrink_window,
1486 .maxlen = sizeof(u8),
1487 .mode = 0644,
1488 .proc_handler = proc_dou8vec_minmax,
1489 .extra1 = SYSCTL_ZERO,
1490 .extra2 = SYSCTL_ONE,
1491 },
1492 { }
1493 };
1494
ipv4_sysctl_init_net(struct net * net)1495 static __net_init int ipv4_sysctl_init_net(struct net *net)
1496 {
1497 struct ctl_table *table;
1498
1499 table = ipv4_net_table;
1500 if (!net_eq(net, &init_net)) {
1501 int i;
1502
1503 table = kmemdup(table, sizeof(ipv4_net_table), GFP_KERNEL);
1504 if (!table)
1505 goto err_alloc;
1506
1507 for (i = 0; i < ARRAY_SIZE(ipv4_net_table) - 1; i++) {
1508 if (table[i].data) {
1509 /* Update the variables to point into
1510 * the current struct net
1511 */
1512 table[i].data += (void *)net - (void *)&init_net;
1513 } else {
1514 /* Entries without data pointer are global;
1515 * Make them read-only in non-init_net ns
1516 */
1517 table[i].mode &= ~0222;
1518 }
1519 }
1520 }
1521
1522 net->ipv4.ipv4_hdr = register_net_sysctl_sz(net, "net/ipv4", table,
1523 ARRAY_SIZE(ipv4_net_table));
1524 if (!net->ipv4.ipv4_hdr)
1525 goto err_reg;
1526
1527 net->ipv4.sysctl_local_reserved_ports = kzalloc(65536 / 8, GFP_KERNEL);
1528 if (!net->ipv4.sysctl_local_reserved_ports)
1529 goto err_ports;
1530
1531 return 0;
1532
1533 err_ports:
1534 unregister_net_sysctl_table(net->ipv4.ipv4_hdr);
1535 err_reg:
1536 if (!net_eq(net, &init_net))
1537 kfree(table);
1538 err_alloc:
1539 return -ENOMEM;
1540 }
1541
ipv4_sysctl_exit_net(struct net * net)1542 static __net_exit void ipv4_sysctl_exit_net(struct net *net)
1543 {
1544 struct ctl_table *table;
1545
1546 kfree(net->ipv4.sysctl_local_reserved_ports);
1547 table = net->ipv4.ipv4_hdr->ctl_table_arg;
1548 unregister_net_sysctl_table(net->ipv4.ipv4_hdr);
1549 kfree(table);
1550 }
1551
1552 static __net_initdata struct pernet_operations ipv4_sysctl_ops = {
1553 .init = ipv4_sysctl_init_net,
1554 .exit = ipv4_sysctl_exit_net,
1555 };
1556
sysctl_ipv4_init(void)1557 static __init int sysctl_ipv4_init(void)
1558 {
1559 struct ctl_table_header *hdr;
1560
1561 hdr = register_net_sysctl(&init_net, "net/ipv4", ipv4_table);
1562 if (!hdr)
1563 return -ENOMEM;
1564
1565 if (register_pernet_subsys(&ipv4_sysctl_ops)) {
1566 unregister_net_sysctl_table(hdr);
1567 return -ENOMEM;
1568 }
1569
1570 return 0;
1571 }
1572
1573 __initcall(sysctl_ipv4_init);
1574