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