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