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