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 zero;
32 static int one = 1;
33 static int two = 2;
34 static int four = 4;
35 static int thousand = 1000;
36 static int gso_max_segs = GSO_MAX_SEGS;
37 static int tcp_retr1_max = 255;
38 static int ip_local_port_range_min[] = { 1, 1 };
39 static int ip_local_port_range_max[] = { 65535, 65535 };
40 static int tcp_adv_win_scale_min = -31;
41 static int tcp_adv_win_scale_max = 31;
42 static int tcp_min_snd_mss_min = TCP_MIN_SND_MSS;
43 static int tcp_min_snd_mss_max = 65535;
44 static int ip_privileged_port_min;
45 static int ip_privileged_port_max = 65535;
46 static int ip_ttl_min = 1;
47 static int ip_ttl_max = 255;
48 static int tcp_syn_retries_min = 1;
49 static int tcp_syn_retries_max = MAX_TCP_SYNCNT;
50 static int ip_ping_group_range_min[] = { 0, 0 };
51 static int ip_ping_group_range_max[] = { GID_T_MAX, GID_T_MAX };
52 static int comp_sack_nr_max = 255;
53 static u32 u32_max_div_HZ = UINT_MAX / HZ;
54 static int one_day_secs = 24 * 3600;
55
56 /* obsolete */
57 static int sysctl_tcp_low_latency __read_mostly;
58
59 /* Update system visible IP port range */
set_local_port_range(struct net * net,int range[2])60 static void set_local_port_range(struct net *net, int range[2])
61 {
62 bool same_parity = !((range[0] ^ range[1]) & 1);
63
64 write_seqlock_bh(&net->ipv4.ip_local_ports.lock);
65 if (same_parity && !net->ipv4.ip_local_ports.warned) {
66 net->ipv4.ip_local_ports.warned = true;
67 pr_err_ratelimited("ip_local_port_range: prefer different parity for start/end values.\n");
68 }
69 net->ipv4.ip_local_ports.range[0] = range[0];
70 net->ipv4.ip_local_ports.range[1] = range[1];
71 write_sequnlock_bh(&net->ipv4.ip_local_ports.lock);
72 }
73
74 /* Validate changes from /proc interface. */
ipv4_local_port_range(struct ctl_table * table,int write,void __user * buffer,size_t * lenp,loff_t * ppos)75 static int ipv4_local_port_range(struct ctl_table *table, int write,
76 void __user *buffer,
77 size_t *lenp, loff_t *ppos)
78 {
79 struct net *net =
80 container_of(table->data, struct net, ipv4.ip_local_ports.range);
81 int ret;
82 int range[2];
83 struct ctl_table tmp = {
84 .data = &range,
85 .maxlen = sizeof(range),
86 .mode = table->mode,
87 .extra1 = &ip_local_port_range_min,
88 .extra2 = &ip_local_port_range_max,
89 };
90
91 inet_get_local_port_range(net, &range[0], &range[1]);
92
93 ret = proc_dointvec_minmax(&tmp, write, buffer, lenp, ppos);
94
95 if (write && ret == 0) {
96 /* Ensure that the upper limit is not smaller than the lower,
97 * and that the lower does not encroach upon the privileged
98 * port limit.
99 */
100 if ((range[1] < range[0]) ||
101 (range[0] < net->ipv4.sysctl_ip_prot_sock))
102 ret = -EINVAL;
103 else
104 set_local_port_range(net, range);
105 }
106
107 return ret;
108 }
109
110 /* Validate changes from /proc interface. */
ipv4_privileged_ports(struct ctl_table * table,int write,void __user * buffer,size_t * lenp,loff_t * ppos)111 static int ipv4_privileged_ports(struct ctl_table *table, int write,
112 void __user *buffer, size_t *lenp, loff_t *ppos)
113 {
114 struct net *net = container_of(table->data, struct net,
115 ipv4.sysctl_ip_prot_sock);
116 int ret;
117 int pports;
118 int range[2];
119 struct ctl_table tmp = {
120 .data = &pports,
121 .maxlen = sizeof(pports),
122 .mode = table->mode,
123 .extra1 = &ip_privileged_port_min,
124 .extra2 = &ip_privileged_port_max,
125 };
126
127 pports = net->ipv4.sysctl_ip_prot_sock;
128
129 ret = proc_dointvec_minmax(&tmp, write, buffer, lenp, ppos);
130
131 if (write && ret == 0) {
132 inet_get_local_port_range(net, &range[0], &range[1]);
133 /* Ensure that the local port range doesn't overlap with the
134 * privileged port range.
135 */
136 if (range[0] < pports)
137 ret = -EINVAL;
138 else
139 net->ipv4.sysctl_ip_prot_sock = pports;
140 }
141
142 return ret;
143 }
144
inet_get_ping_group_range_table(struct ctl_table * table,kgid_t * low,kgid_t * high)145 static void inet_get_ping_group_range_table(struct ctl_table *table, kgid_t *low, kgid_t *high)
146 {
147 kgid_t *data = table->data;
148 struct net *net =
149 container_of(table->data, struct net, ipv4.ping_group_range.range);
150 unsigned int seq;
151 do {
152 seq = read_seqbegin(&net->ipv4.ping_group_range.lock);
153
154 *low = data[0];
155 *high = data[1];
156 } while (read_seqretry(&net->ipv4.ping_group_range.lock, seq));
157 }
158
159 /* Update system visible IP port range */
set_ping_group_range(struct ctl_table * table,kgid_t low,kgid_t high)160 static void set_ping_group_range(struct ctl_table *table, kgid_t low, kgid_t high)
161 {
162 kgid_t *data = table->data;
163 struct net *net =
164 container_of(table->data, struct net, ipv4.ping_group_range.range);
165 write_seqlock(&net->ipv4.ping_group_range.lock);
166 data[0] = low;
167 data[1] = high;
168 write_sequnlock(&net->ipv4.ping_group_range.lock);
169 }
170
171 /* Validate changes from /proc interface. */
ipv4_ping_group_range(struct ctl_table * table,int write,void __user * buffer,size_t * lenp,loff_t * ppos)172 static int ipv4_ping_group_range(struct ctl_table *table, int write,
173 void __user *buffer,
174 size_t *lenp, loff_t *ppos)
175 {
176 struct user_namespace *user_ns = current_user_ns();
177 int ret;
178 gid_t urange[2];
179 kgid_t low, high;
180 struct ctl_table tmp = {
181 .data = &urange,
182 .maxlen = sizeof(urange),
183 .mode = table->mode,
184 .extra1 = &ip_ping_group_range_min,
185 .extra2 = &ip_ping_group_range_max,
186 };
187
188 inet_get_ping_group_range_table(table, &low, &high);
189 urange[0] = from_kgid_munged(user_ns, low);
190 urange[1] = from_kgid_munged(user_ns, high);
191 ret = proc_dointvec_minmax(&tmp, write, buffer, lenp, ppos);
192
193 if (write && ret == 0) {
194 low = make_kgid(user_ns, urange[0]);
195 high = make_kgid(user_ns, urange[1]);
196 if (!gid_valid(low) || !gid_valid(high))
197 return -EINVAL;
198 if (urange[1] < urange[0] || gid_lt(high, low)) {
199 low = make_kgid(&init_user_ns, 1);
200 high = make_kgid(&init_user_ns, 0);
201 }
202 set_ping_group_range(table, low, high);
203 }
204
205 return ret;
206 }
207
ipv4_fwd_update_priority(struct ctl_table * table,int write,void __user * buffer,size_t * lenp,loff_t * ppos)208 static int ipv4_fwd_update_priority(struct ctl_table *table, int write,
209 void __user *buffer,
210 size_t *lenp, loff_t *ppos)
211 {
212 struct net *net;
213 int ret;
214
215 net = container_of(table->data, struct net,
216 ipv4.sysctl_ip_fwd_update_priority);
217 ret = proc_dointvec_minmax(table, write, buffer, lenp, ppos);
218 if (write && ret == 0)
219 call_netevent_notifiers(NETEVENT_IPV4_FWD_UPDATE_PRIORITY_UPDATE,
220 net);
221
222 return ret;
223 }
224
proc_tcp_congestion_control(struct ctl_table * ctl,int write,void __user * buffer,size_t * lenp,loff_t * ppos)225 static int proc_tcp_congestion_control(struct ctl_table *ctl, int write,
226 void __user *buffer, size_t *lenp, loff_t *ppos)
227 {
228 struct net *net = container_of(ctl->data, struct net,
229 ipv4.tcp_congestion_control);
230 char val[TCP_CA_NAME_MAX];
231 struct ctl_table tbl = {
232 .data = val,
233 .maxlen = TCP_CA_NAME_MAX,
234 };
235 int ret;
236
237 tcp_get_default_congestion_control(net, val);
238
239 ret = proc_dostring(&tbl, write, buffer, lenp, ppos);
240 if (write && ret == 0)
241 ret = tcp_set_default_congestion_control(net, val);
242 return ret;
243 }
244
proc_tcp_available_congestion_control(struct ctl_table * ctl,int write,void __user * buffer,size_t * lenp,loff_t * ppos)245 static int proc_tcp_available_congestion_control(struct ctl_table *ctl,
246 int write,
247 void __user *buffer, size_t *lenp,
248 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 tcp_get_available_congestion_control(tbl.data, TCP_CA_BUF_MAX);
257 ret = proc_dostring(&tbl, write, buffer, lenp, ppos);
258 kfree(tbl.data);
259 return ret;
260 }
261
proc_allowed_congestion_control(struct ctl_table * ctl,int write,void __user * buffer,size_t * lenp,loff_t * ppos)262 static int proc_allowed_congestion_control(struct ctl_table *ctl,
263 int write,
264 void __user *buffer, size_t *lenp,
265 loff_t *ppos)
266 {
267 struct ctl_table tbl = { .maxlen = TCP_CA_BUF_MAX };
268 int ret;
269
270 tbl.data = kmalloc(tbl.maxlen, GFP_USER);
271 if (!tbl.data)
272 return -ENOMEM;
273
274 tcp_get_allowed_congestion_control(tbl.data, tbl.maxlen);
275 ret = proc_dostring(&tbl, write, buffer, lenp, ppos);
276 if (write && ret == 0)
277 ret = tcp_set_allowed_congestion_control(tbl.data);
278 kfree(tbl.data);
279 return ret;
280 }
281
proc_tcp_fastopen_key(struct ctl_table * table,int write,void __user * buffer,size_t * lenp,loff_t * ppos)282 static int proc_tcp_fastopen_key(struct ctl_table *table, int write,
283 void __user *buffer, size_t *lenp,
284 loff_t *ppos)
285 {
286 struct net *net = container_of(table->data, struct net,
287 ipv4.sysctl_tcp_fastopen);
288 struct ctl_table tbl = { .maxlen = (TCP_FASTOPEN_KEY_LENGTH * 2 + 10) };
289 struct tcp_fastopen_context *ctxt;
290 u32 user_key[4]; /* 16 bytes, matching TCP_FASTOPEN_KEY_LENGTH */
291 __le32 key[4];
292 int ret, i;
293
294 tbl.data = kmalloc(tbl.maxlen, GFP_KERNEL);
295 if (!tbl.data)
296 return -ENOMEM;
297
298 rcu_read_lock();
299 ctxt = rcu_dereference(net->ipv4.tcp_fastopen_ctx);
300 if (ctxt)
301 memcpy(key, ctxt->key, TCP_FASTOPEN_KEY_LENGTH);
302 else
303 memset(key, 0, sizeof(key));
304 rcu_read_unlock();
305
306 for (i = 0; i < ARRAY_SIZE(key); i++)
307 user_key[i] = le32_to_cpu(key[i]);
308
309 snprintf(tbl.data, tbl.maxlen, "%08x-%08x-%08x-%08x",
310 user_key[0], user_key[1], user_key[2], user_key[3]);
311 ret = proc_dostring(&tbl, write, buffer, lenp, ppos);
312
313 if (write && ret == 0) {
314 if (sscanf(tbl.data, "%x-%x-%x-%x", user_key, user_key + 1,
315 user_key + 2, user_key + 3) != 4) {
316 ret = -EINVAL;
317 goto bad_key;
318 }
319
320 for (i = 0; i < ARRAY_SIZE(user_key); i++)
321 key[i] = cpu_to_le32(user_key[i]);
322
323 tcp_fastopen_reset_cipher(net, NULL, key,
324 TCP_FASTOPEN_KEY_LENGTH);
325 }
326
327 bad_key:
328 pr_debug("proc FO key set 0x%x-%x-%x-%x <- 0x%s: %u\n",
329 user_key[0], user_key[1], user_key[2], user_key[3],
330 (char *)tbl.data, ret);
331 kfree(tbl.data);
332 return ret;
333 }
334
proc_configure_early_demux(int enabled,int protocol)335 static void proc_configure_early_demux(int enabled, int protocol)
336 {
337 struct net_protocol *ipprot;
338 #if IS_ENABLED(CONFIG_IPV6)
339 struct inet6_protocol *ip6prot;
340 #endif
341
342 rcu_read_lock();
343
344 ipprot = rcu_dereference(inet_protos[protocol]);
345 if (ipprot)
346 ipprot->early_demux = enabled ? ipprot->early_demux_handler :
347 NULL;
348
349 #if IS_ENABLED(CONFIG_IPV6)
350 ip6prot = rcu_dereference(inet6_protos[protocol]);
351 if (ip6prot)
352 ip6prot->early_demux = enabled ? ip6prot->early_demux_handler :
353 NULL;
354 #endif
355 rcu_read_unlock();
356 }
357
proc_tcp_early_demux(struct ctl_table * table,int write,void __user * buffer,size_t * lenp,loff_t * ppos)358 static int proc_tcp_early_demux(struct ctl_table *table, int write,
359 void __user *buffer, size_t *lenp, loff_t *ppos)
360 {
361 int ret = 0;
362
363 ret = proc_dointvec(table, write, buffer, lenp, ppos);
364
365 if (write && !ret) {
366 int enabled = init_net.ipv4.sysctl_tcp_early_demux;
367
368 proc_configure_early_demux(enabled, IPPROTO_TCP);
369 }
370
371 return ret;
372 }
373
proc_udp_early_demux(struct ctl_table * table,int write,void __user * buffer,size_t * lenp,loff_t * ppos)374 static int proc_udp_early_demux(struct ctl_table *table, int write,
375 void __user *buffer, size_t *lenp, loff_t *ppos)
376 {
377 int ret = 0;
378
379 ret = proc_dointvec(table, write, buffer, lenp, ppos);
380
381 if (write && !ret) {
382 int enabled = init_net.ipv4.sysctl_udp_early_demux;
383
384 proc_configure_early_demux(enabled, IPPROTO_UDP);
385 }
386
387 return ret;
388 }
389
proc_tfo_blackhole_detect_timeout(struct ctl_table * table,int write,void __user * buffer,size_t * lenp,loff_t * ppos)390 static int proc_tfo_blackhole_detect_timeout(struct ctl_table *table,
391 int write,
392 void __user *buffer,
393 size_t *lenp, loff_t *ppos)
394 {
395 struct net *net = container_of(table->data, struct net,
396 ipv4.sysctl_tcp_fastopen_blackhole_timeout);
397 int ret;
398
399 ret = proc_dointvec_minmax(table, write, buffer, lenp, ppos);
400 if (write && ret == 0)
401 atomic_set(&net->ipv4.tfo_active_disable_times, 0);
402
403 return ret;
404 }
405
proc_tcp_available_ulp(struct ctl_table * ctl,int write,void __user * buffer,size_t * lenp,loff_t * ppos)406 static int proc_tcp_available_ulp(struct ctl_table *ctl,
407 int write,
408 void __user *buffer, size_t *lenp,
409 loff_t *ppos)
410 {
411 struct ctl_table tbl = { .maxlen = TCP_ULP_BUF_MAX, };
412 int ret;
413
414 tbl.data = kmalloc(tbl.maxlen, GFP_USER);
415 if (!tbl.data)
416 return -ENOMEM;
417 tcp_get_available_ulp(tbl.data, TCP_ULP_BUF_MAX);
418 ret = proc_dostring(&tbl, write, buffer, lenp, ppos);
419 kfree(tbl.data);
420
421 return ret;
422 }
423
424 #ifdef CONFIG_IP_ROUTE_MULTIPATH
proc_fib_multipath_hash_policy(struct ctl_table * table,int write,void __user * buffer,size_t * lenp,loff_t * ppos)425 static int proc_fib_multipath_hash_policy(struct ctl_table *table, int write,
426 void __user *buffer, size_t *lenp,
427 loff_t *ppos)
428 {
429 struct net *net = container_of(table->data, struct net,
430 ipv4.sysctl_fib_multipath_hash_policy);
431 int ret;
432
433 ret = proc_dointvec_minmax(table, write, buffer, lenp, ppos);
434 if (write && ret == 0)
435 call_netevent_notifiers(NETEVENT_IPV4_MPATH_HASH_UPDATE, net);
436
437 return ret;
438 }
439 #endif
440
441 static struct ctl_table ipv4_table[] = {
442 {
443 .procname = "tcp_max_orphans",
444 .data = &sysctl_tcp_max_orphans,
445 .maxlen = sizeof(int),
446 .mode = 0644,
447 .proc_handler = proc_dointvec
448 },
449 {
450 .procname = "inet_peer_threshold",
451 .data = &inet_peer_threshold,
452 .maxlen = sizeof(int),
453 .mode = 0644,
454 .proc_handler = proc_dointvec
455 },
456 {
457 .procname = "inet_peer_minttl",
458 .data = &inet_peer_minttl,
459 .maxlen = sizeof(int),
460 .mode = 0644,
461 .proc_handler = proc_dointvec_jiffies,
462 },
463 {
464 .procname = "inet_peer_maxttl",
465 .data = &inet_peer_maxttl,
466 .maxlen = sizeof(int),
467 .mode = 0644,
468 .proc_handler = proc_dointvec_jiffies,
469 },
470 {
471 .procname = "tcp_mem",
472 .maxlen = sizeof(sysctl_tcp_mem),
473 .data = &sysctl_tcp_mem,
474 .mode = 0644,
475 .proc_handler = proc_doulongvec_minmax,
476 },
477 {
478 .procname = "tcp_low_latency",
479 .data = &sysctl_tcp_low_latency,
480 .maxlen = sizeof(int),
481 .mode = 0644,
482 .proc_handler = proc_dointvec
483 },
484 #ifdef CONFIG_NETLABEL
485 {
486 .procname = "cipso_cache_enable",
487 .data = &cipso_v4_cache_enabled,
488 .maxlen = sizeof(int),
489 .mode = 0644,
490 .proc_handler = proc_dointvec,
491 },
492 {
493 .procname = "cipso_cache_bucket_size",
494 .data = &cipso_v4_cache_bucketsize,
495 .maxlen = sizeof(int),
496 .mode = 0644,
497 .proc_handler = proc_dointvec,
498 },
499 {
500 .procname = "cipso_rbm_optfmt",
501 .data = &cipso_v4_rbm_optfmt,
502 .maxlen = sizeof(int),
503 .mode = 0644,
504 .proc_handler = proc_dointvec,
505 },
506 {
507 .procname = "cipso_rbm_strictvalid",
508 .data = &cipso_v4_rbm_strictvalid,
509 .maxlen = sizeof(int),
510 .mode = 0644,
511 .proc_handler = proc_dointvec,
512 },
513 #endif /* CONFIG_NETLABEL */
514 {
515 .procname = "tcp_available_congestion_control",
516 .maxlen = TCP_CA_BUF_MAX,
517 .mode = 0444,
518 .proc_handler = proc_tcp_available_congestion_control,
519 },
520 {
521 .procname = "tcp_allowed_congestion_control",
522 .maxlen = TCP_CA_BUF_MAX,
523 .mode = 0644,
524 .proc_handler = proc_allowed_congestion_control,
525 },
526 {
527 .procname = "tcp_available_ulp",
528 .maxlen = TCP_ULP_BUF_MAX,
529 .mode = 0444,
530 .proc_handler = proc_tcp_available_ulp,
531 },
532 {
533 .procname = "icmp_msgs_per_sec",
534 .data = &sysctl_icmp_msgs_per_sec,
535 .maxlen = sizeof(int),
536 .mode = 0644,
537 .proc_handler = proc_dointvec_minmax,
538 .extra1 = &zero,
539 },
540 {
541 .procname = "icmp_msgs_burst",
542 .data = &sysctl_icmp_msgs_burst,
543 .maxlen = sizeof(int),
544 .mode = 0644,
545 .proc_handler = proc_dointvec_minmax,
546 .extra1 = &zero,
547 },
548 {
549 .procname = "udp_mem",
550 .data = &sysctl_udp_mem,
551 .maxlen = sizeof(sysctl_udp_mem),
552 .mode = 0644,
553 .proc_handler = proc_doulongvec_minmax,
554 },
555 { }
556 };
557
558 static struct ctl_table ipv4_net_table[] = {
559 {
560 .procname = "icmp_echo_ignore_all",
561 .data = &init_net.ipv4.sysctl_icmp_echo_ignore_all,
562 .maxlen = sizeof(int),
563 .mode = 0644,
564 .proc_handler = proc_dointvec
565 },
566 {
567 .procname = "icmp_echo_ignore_broadcasts",
568 .data = &init_net.ipv4.sysctl_icmp_echo_ignore_broadcasts,
569 .maxlen = sizeof(int),
570 .mode = 0644,
571 .proc_handler = proc_dointvec
572 },
573 {
574 .procname = "icmp_ignore_bogus_error_responses",
575 .data = &init_net.ipv4.sysctl_icmp_ignore_bogus_error_responses,
576 .maxlen = sizeof(int),
577 .mode = 0644,
578 .proc_handler = proc_dointvec
579 },
580 {
581 .procname = "icmp_errors_use_inbound_ifaddr",
582 .data = &init_net.ipv4.sysctl_icmp_errors_use_inbound_ifaddr,
583 .maxlen = sizeof(int),
584 .mode = 0644,
585 .proc_handler = proc_dointvec
586 },
587 {
588 .procname = "icmp_ratelimit",
589 .data = &init_net.ipv4.sysctl_icmp_ratelimit,
590 .maxlen = sizeof(int),
591 .mode = 0644,
592 .proc_handler = proc_dointvec_ms_jiffies,
593 },
594 {
595 .procname = "icmp_ratemask",
596 .data = &init_net.ipv4.sysctl_icmp_ratemask,
597 .maxlen = sizeof(int),
598 .mode = 0644,
599 .proc_handler = proc_dointvec
600 },
601 {
602 .procname = "ping_group_range",
603 .data = &init_net.ipv4.ping_group_range.range,
604 .maxlen = sizeof(gid_t)*2,
605 .mode = 0644,
606 .proc_handler = ipv4_ping_group_range,
607 },
608 {
609 .procname = "tcp_ecn",
610 .data = &init_net.ipv4.sysctl_tcp_ecn,
611 .maxlen = sizeof(int),
612 .mode = 0644,
613 .proc_handler = proc_dointvec
614 },
615 {
616 .procname = "tcp_ecn_fallback",
617 .data = &init_net.ipv4.sysctl_tcp_ecn_fallback,
618 .maxlen = sizeof(int),
619 .mode = 0644,
620 .proc_handler = proc_dointvec
621 },
622 {
623 .procname = "ip_dynaddr",
624 .data = &init_net.ipv4.sysctl_ip_dynaddr,
625 .maxlen = sizeof(int),
626 .mode = 0644,
627 .proc_handler = proc_dointvec
628 },
629 {
630 .procname = "ip_early_demux",
631 .data = &init_net.ipv4.sysctl_ip_early_demux,
632 .maxlen = sizeof(int),
633 .mode = 0644,
634 .proc_handler = proc_dointvec
635 },
636 {
637 .procname = "udp_early_demux",
638 .data = &init_net.ipv4.sysctl_udp_early_demux,
639 .maxlen = sizeof(int),
640 .mode = 0644,
641 .proc_handler = proc_udp_early_demux
642 },
643 {
644 .procname = "tcp_early_demux",
645 .data = &init_net.ipv4.sysctl_tcp_early_demux,
646 .maxlen = sizeof(int),
647 .mode = 0644,
648 .proc_handler = proc_tcp_early_demux
649 },
650 {
651 .procname = "ip_default_ttl",
652 .data = &init_net.ipv4.sysctl_ip_default_ttl,
653 .maxlen = sizeof(int),
654 .mode = 0644,
655 .proc_handler = proc_dointvec_minmax,
656 .extra1 = &ip_ttl_min,
657 .extra2 = &ip_ttl_max,
658 },
659 {
660 .procname = "ip_local_port_range",
661 .maxlen = sizeof(init_net.ipv4.ip_local_ports.range),
662 .data = &init_net.ipv4.ip_local_ports.range,
663 .mode = 0644,
664 .proc_handler = ipv4_local_port_range,
665 },
666 {
667 .procname = "ip_local_reserved_ports",
668 .data = &init_net.ipv4.sysctl_local_reserved_ports,
669 .maxlen = 65536,
670 .mode = 0644,
671 .proc_handler = proc_do_large_bitmap,
672 },
673 {
674 .procname = "ip_no_pmtu_disc",
675 .data = &init_net.ipv4.sysctl_ip_no_pmtu_disc,
676 .maxlen = sizeof(int),
677 .mode = 0644,
678 .proc_handler = proc_dointvec
679 },
680 {
681 .procname = "ip_forward_use_pmtu",
682 .data = &init_net.ipv4.sysctl_ip_fwd_use_pmtu,
683 .maxlen = sizeof(int),
684 .mode = 0644,
685 .proc_handler = proc_dointvec,
686 },
687 {
688 .procname = "ip_forward_update_priority",
689 .data = &init_net.ipv4.sysctl_ip_fwd_update_priority,
690 .maxlen = sizeof(int),
691 .mode = 0644,
692 .proc_handler = ipv4_fwd_update_priority,
693 .extra1 = &zero,
694 .extra2 = &one,
695 },
696 {
697 .procname = "ip_nonlocal_bind",
698 .data = &init_net.ipv4.sysctl_ip_nonlocal_bind,
699 .maxlen = sizeof(int),
700 .mode = 0644,
701 .proc_handler = proc_dointvec
702 },
703 {
704 .procname = "fwmark_reflect",
705 .data = &init_net.ipv4.sysctl_fwmark_reflect,
706 .maxlen = sizeof(int),
707 .mode = 0644,
708 .proc_handler = proc_dointvec,
709 },
710 {
711 .procname = "tcp_fwmark_accept",
712 .data = &init_net.ipv4.sysctl_tcp_fwmark_accept,
713 .maxlen = sizeof(int),
714 .mode = 0644,
715 .proc_handler = proc_dointvec,
716 },
717 #ifdef CONFIG_NET_L3_MASTER_DEV
718 {
719 .procname = "tcp_l3mdev_accept",
720 .data = &init_net.ipv4.sysctl_tcp_l3mdev_accept,
721 .maxlen = sizeof(int),
722 .mode = 0644,
723 .proc_handler = proc_dointvec_minmax,
724 .extra1 = &zero,
725 .extra2 = &one,
726 },
727 #endif
728 {
729 .procname = "tcp_mtu_probing",
730 .data = &init_net.ipv4.sysctl_tcp_mtu_probing,
731 .maxlen = sizeof(int),
732 .mode = 0644,
733 .proc_handler = proc_dointvec,
734 },
735 {
736 .procname = "tcp_base_mss",
737 .data = &init_net.ipv4.sysctl_tcp_base_mss,
738 .maxlen = sizeof(int),
739 .mode = 0644,
740 .proc_handler = proc_dointvec,
741 },
742 {
743 .procname = "tcp_min_snd_mss",
744 .data = &init_net.ipv4.sysctl_tcp_min_snd_mss,
745 .maxlen = sizeof(int),
746 .mode = 0644,
747 .proc_handler = proc_dointvec_minmax,
748 .extra1 = &tcp_min_snd_mss_min,
749 .extra2 = &tcp_min_snd_mss_max,
750 },
751 {
752 .procname = "tcp_probe_threshold",
753 .data = &init_net.ipv4.sysctl_tcp_probe_threshold,
754 .maxlen = sizeof(int),
755 .mode = 0644,
756 .proc_handler = proc_dointvec,
757 },
758 {
759 .procname = "tcp_probe_interval",
760 .data = &init_net.ipv4.sysctl_tcp_probe_interval,
761 .maxlen = sizeof(u32),
762 .mode = 0644,
763 .proc_handler = proc_douintvec_minmax,
764 .extra2 = &u32_max_div_HZ,
765 },
766 {
767 .procname = "igmp_link_local_mcast_reports",
768 .data = &init_net.ipv4.sysctl_igmp_llm_reports,
769 .maxlen = sizeof(int),
770 .mode = 0644,
771 .proc_handler = proc_dointvec
772 },
773 {
774 .procname = "igmp_max_memberships",
775 .data = &init_net.ipv4.sysctl_igmp_max_memberships,
776 .maxlen = sizeof(int),
777 .mode = 0644,
778 .proc_handler = proc_dointvec
779 },
780 {
781 .procname = "igmp_max_msf",
782 .data = &init_net.ipv4.sysctl_igmp_max_msf,
783 .maxlen = sizeof(int),
784 .mode = 0644,
785 .proc_handler = proc_dointvec
786 },
787 #ifdef CONFIG_IP_MULTICAST
788 {
789 .procname = "igmp_qrv",
790 .data = &init_net.ipv4.sysctl_igmp_qrv,
791 .maxlen = sizeof(int),
792 .mode = 0644,
793 .proc_handler = proc_dointvec_minmax,
794 .extra1 = &one
795 },
796 #endif
797 {
798 .procname = "tcp_congestion_control",
799 .data = &init_net.ipv4.tcp_congestion_control,
800 .mode = 0644,
801 .maxlen = TCP_CA_NAME_MAX,
802 .proc_handler = proc_tcp_congestion_control,
803 },
804 {
805 .procname = "tcp_keepalive_time",
806 .data = &init_net.ipv4.sysctl_tcp_keepalive_time,
807 .maxlen = sizeof(int),
808 .mode = 0644,
809 .proc_handler = proc_dointvec_jiffies,
810 },
811 {
812 .procname = "tcp_keepalive_probes",
813 .data = &init_net.ipv4.sysctl_tcp_keepalive_probes,
814 .maxlen = sizeof(int),
815 .mode = 0644,
816 .proc_handler = proc_dointvec
817 },
818 {
819 .procname = "tcp_keepalive_intvl",
820 .data = &init_net.ipv4.sysctl_tcp_keepalive_intvl,
821 .maxlen = sizeof(int),
822 .mode = 0644,
823 .proc_handler = proc_dointvec_jiffies,
824 },
825 {
826 .procname = "tcp_syn_retries",
827 .data = &init_net.ipv4.sysctl_tcp_syn_retries,
828 .maxlen = sizeof(int),
829 .mode = 0644,
830 .proc_handler = proc_dointvec_minmax,
831 .extra1 = &tcp_syn_retries_min,
832 .extra2 = &tcp_syn_retries_max
833 },
834 {
835 .procname = "tcp_synack_retries",
836 .data = &init_net.ipv4.sysctl_tcp_synack_retries,
837 .maxlen = sizeof(int),
838 .mode = 0644,
839 .proc_handler = proc_dointvec
840 },
841 #ifdef CONFIG_SYN_COOKIES
842 {
843 .procname = "tcp_syncookies",
844 .data = &init_net.ipv4.sysctl_tcp_syncookies,
845 .maxlen = sizeof(int),
846 .mode = 0644,
847 .proc_handler = proc_dointvec
848 },
849 #endif
850 {
851 .procname = "tcp_reordering",
852 .data = &init_net.ipv4.sysctl_tcp_reordering,
853 .maxlen = sizeof(int),
854 .mode = 0644,
855 .proc_handler = proc_dointvec
856 },
857 {
858 .procname = "tcp_retries1",
859 .data = &init_net.ipv4.sysctl_tcp_retries1,
860 .maxlen = sizeof(int),
861 .mode = 0644,
862 .proc_handler = proc_dointvec_minmax,
863 .extra2 = &tcp_retr1_max
864 },
865 {
866 .procname = "tcp_retries2",
867 .data = &init_net.ipv4.sysctl_tcp_retries2,
868 .maxlen = sizeof(int),
869 .mode = 0644,
870 .proc_handler = proc_dointvec
871 },
872 {
873 .procname = "tcp_orphan_retries",
874 .data = &init_net.ipv4.sysctl_tcp_orphan_retries,
875 .maxlen = sizeof(int),
876 .mode = 0644,
877 .proc_handler = proc_dointvec
878 },
879 {
880 .procname = "tcp_fin_timeout",
881 .data = &init_net.ipv4.sysctl_tcp_fin_timeout,
882 .maxlen = sizeof(int),
883 .mode = 0644,
884 .proc_handler = proc_dointvec_jiffies,
885 },
886 {
887 .procname = "tcp_notsent_lowat",
888 .data = &init_net.ipv4.sysctl_tcp_notsent_lowat,
889 .maxlen = sizeof(unsigned int),
890 .mode = 0644,
891 .proc_handler = proc_douintvec,
892 },
893 {
894 .procname = "tcp_tw_reuse",
895 .data = &init_net.ipv4.sysctl_tcp_tw_reuse,
896 .maxlen = sizeof(int),
897 .mode = 0644,
898 .proc_handler = proc_dointvec_minmax,
899 .extra1 = &zero,
900 .extra2 = &two,
901 },
902 {
903 .procname = "tcp_max_tw_buckets",
904 .data = &init_net.ipv4.tcp_death_row.sysctl_max_tw_buckets,
905 .maxlen = sizeof(int),
906 .mode = 0644,
907 .proc_handler = proc_dointvec
908 },
909 {
910 .procname = "tcp_max_syn_backlog",
911 .data = &init_net.ipv4.sysctl_max_syn_backlog,
912 .maxlen = sizeof(int),
913 .mode = 0644,
914 .proc_handler = proc_dointvec
915 },
916 {
917 .procname = "tcp_fastopen",
918 .data = &init_net.ipv4.sysctl_tcp_fastopen,
919 .maxlen = sizeof(int),
920 .mode = 0644,
921 .proc_handler = proc_dointvec,
922 },
923 {
924 .procname = "tcp_fastopen_key",
925 .mode = 0600,
926 .data = &init_net.ipv4.sysctl_tcp_fastopen,
927 .maxlen = ((TCP_FASTOPEN_KEY_LENGTH * 2) + 10),
928 .proc_handler = proc_tcp_fastopen_key,
929 },
930 {
931 .procname = "tcp_fastopen_blackhole_timeout_sec",
932 .data = &init_net.ipv4.sysctl_tcp_fastopen_blackhole_timeout,
933 .maxlen = sizeof(int),
934 .mode = 0644,
935 .proc_handler = proc_tfo_blackhole_detect_timeout,
936 .extra1 = &zero,
937 },
938 #ifdef CONFIG_IP_ROUTE_MULTIPATH
939 {
940 .procname = "fib_multipath_use_neigh",
941 .data = &init_net.ipv4.sysctl_fib_multipath_use_neigh,
942 .maxlen = sizeof(int),
943 .mode = 0644,
944 .proc_handler = proc_dointvec_minmax,
945 .extra1 = &zero,
946 .extra2 = &one,
947 },
948 {
949 .procname = "fib_multipath_hash_policy",
950 .data = &init_net.ipv4.sysctl_fib_multipath_hash_policy,
951 .maxlen = sizeof(int),
952 .mode = 0644,
953 .proc_handler = proc_fib_multipath_hash_policy,
954 .extra1 = &zero,
955 .extra2 = &one,
956 },
957 #endif
958 {
959 .procname = "ip_unprivileged_port_start",
960 .maxlen = sizeof(int),
961 .data = &init_net.ipv4.sysctl_ip_prot_sock,
962 .mode = 0644,
963 .proc_handler = ipv4_privileged_ports,
964 },
965 #ifdef CONFIG_NET_L3_MASTER_DEV
966 {
967 .procname = "udp_l3mdev_accept",
968 .data = &init_net.ipv4.sysctl_udp_l3mdev_accept,
969 .maxlen = sizeof(int),
970 .mode = 0644,
971 .proc_handler = proc_dointvec_minmax,
972 .extra1 = &zero,
973 .extra2 = &one,
974 },
975 #endif
976 {
977 .procname = "tcp_sack",
978 .data = &init_net.ipv4.sysctl_tcp_sack,
979 .maxlen = sizeof(int),
980 .mode = 0644,
981 .proc_handler = proc_dointvec
982 },
983 {
984 .procname = "tcp_window_scaling",
985 .data = &init_net.ipv4.sysctl_tcp_window_scaling,
986 .maxlen = sizeof(int),
987 .mode = 0644,
988 .proc_handler = proc_dointvec
989 },
990 {
991 .procname = "tcp_timestamps",
992 .data = &init_net.ipv4.sysctl_tcp_timestamps,
993 .maxlen = sizeof(int),
994 .mode = 0644,
995 .proc_handler = proc_dointvec
996 },
997 {
998 .procname = "tcp_early_retrans",
999 .data = &init_net.ipv4.sysctl_tcp_early_retrans,
1000 .maxlen = sizeof(int),
1001 .mode = 0644,
1002 .proc_handler = proc_dointvec_minmax,
1003 .extra1 = &zero,
1004 .extra2 = &four,
1005 },
1006 {
1007 .procname = "tcp_recovery",
1008 .data = &init_net.ipv4.sysctl_tcp_recovery,
1009 .maxlen = sizeof(int),
1010 .mode = 0644,
1011 .proc_handler = proc_dointvec,
1012 },
1013 {
1014 .procname = "tcp_thin_linear_timeouts",
1015 .data = &init_net.ipv4.sysctl_tcp_thin_linear_timeouts,
1016 .maxlen = sizeof(int),
1017 .mode = 0644,
1018 .proc_handler = proc_dointvec
1019 },
1020 {
1021 .procname = "tcp_slow_start_after_idle",
1022 .data = &init_net.ipv4.sysctl_tcp_slow_start_after_idle,
1023 .maxlen = sizeof(int),
1024 .mode = 0644,
1025 .proc_handler = proc_dointvec
1026 },
1027 {
1028 .procname = "tcp_retrans_collapse",
1029 .data = &init_net.ipv4.sysctl_tcp_retrans_collapse,
1030 .maxlen = sizeof(int),
1031 .mode = 0644,
1032 .proc_handler = proc_dointvec
1033 },
1034 {
1035 .procname = "tcp_stdurg",
1036 .data = &init_net.ipv4.sysctl_tcp_stdurg,
1037 .maxlen = sizeof(int),
1038 .mode = 0644,
1039 .proc_handler = proc_dointvec
1040 },
1041 {
1042 .procname = "tcp_rfc1337",
1043 .data = &init_net.ipv4.sysctl_tcp_rfc1337,
1044 .maxlen = sizeof(int),
1045 .mode = 0644,
1046 .proc_handler = proc_dointvec
1047 },
1048 {
1049 .procname = "tcp_abort_on_overflow",
1050 .data = &init_net.ipv4.sysctl_tcp_abort_on_overflow,
1051 .maxlen = sizeof(int),
1052 .mode = 0644,
1053 .proc_handler = proc_dointvec
1054 },
1055 {
1056 .procname = "tcp_fack",
1057 .data = &init_net.ipv4.sysctl_tcp_fack,
1058 .maxlen = sizeof(int),
1059 .mode = 0644,
1060 .proc_handler = proc_dointvec
1061 },
1062 {
1063 .procname = "tcp_max_reordering",
1064 .data = &init_net.ipv4.sysctl_tcp_max_reordering,
1065 .maxlen = sizeof(int),
1066 .mode = 0644,
1067 .proc_handler = proc_dointvec
1068 },
1069 {
1070 .procname = "tcp_dsack",
1071 .data = &init_net.ipv4.sysctl_tcp_dsack,
1072 .maxlen = sizeof(int),
1073 .mode = 0644,
1074 .proc_handler = proc_dointvec
1075 },
1076 {
1077 .procname = "tcp_app_win",
1078 .data = &init_net.ipv4.sysctl_tcp_app_win,
1079 .maxlen = sizeof(int),
1080 .mode = 0644,
1081 .proc_handler = proc_dointvec
1082 },
1083 {
1084 .procname = "tcp_adv_win_scale",
1085 .data = &init_net.ipv4.sysctl_tcp_adv_win_scale,
1086 .maxlen = sizeof(int),
1087 .mode = 0644,
1088 .proc_handler = proc_dointvec_minmax,
1089 .extra1 = &tcp_adv_win_scale_min,
1090 .extra2 = &tcp_adv_win_scale_max,
1091 },
1092 {
1093 .procname = "tcp_frto",
1094 .data = &init_net.ipv4.sysctl_tcp_frto,
1095 .maxlen = sizeof(int),
1096 .mode = 0644,
1097 .proc_handler = proc_dointvec
1098 },
1099 {
1100 .procname = "tcp_no_metrics_save",
1101 .data = &init_net.ipv4.sysctl_tcp_nometrics_save,
1102 .maxlen = sizeof(int),
1103 .mode = 0644,
1104 .proc_handler = proc_dointvec,
1105 },
1106 {
1107 .procname = "tcp_moderate_rcvbuf",
1108 .data = &init_net.ipv4.sysctl_tcp_moderate_rcvbuf,
1109 .maxlen = sizeof(int),
1110 .mode = 0644,
1111 .proc_handler = proc_dointvec,
1112 },
1113 {
1114 .procname = "tcp_tso_win_divisor",
1115 .data = &init_net.ipv4.sysctl_tcp_tso_win_divisor,
1116 .maxlen = sizeof(int),
1117 .mode = 0644,
1118 .proc_handler = proc_dointvec,
1119 },
1120 {
1121 .procname = "tcp_workaround_signed_windows",
1122 .data = &init_net.ipv4.sysctl_tcp_workaround_signed_windows,
1123 .maxlen = sizeof(int),
1124 .mode = 0644,
1125 .proc_handler = proc_dointvec
1126 },
1127 {
1128 .procname = "tcp_limit_output_bytes",
1129 .data = &init_net.ipv4.sysctl_tcp_limit_output_bytes,
1130 .maxlen = sizeof(int),
1131 .mode = 0644,
1132 .proc_handler = proc_dointvec
1133 },
1134 {
1135 .procname = "tcp_challenge_ack_limit",
1136 .data = &init_net.ipv4.sysctl_tcp_challenge_ack_limit,
1137 .maxlen = sizeof(int),
1138 .mode = 0644,
1139 .proc_handler = proc_dointvec
1140 },
1141 {
1142 .procname = "tcp_min_tso_segs",
1143 .data = &init_net.ipv4.sysctl_tcp_min_tso_segs,
1144 .maxlen = sizeof(int),
1145 .mode = 0644,
1146 .proc_handler = proc_dointvec_minmax,
1147 .extra1 = &one,
1148 .extra2 = &gso_max_segs,
1149 },
1150 {
1151 .procname = "tcp_min_rtt_wlen",
1152 .data = &init_net.ipv4.sysctl_tcp_min_rtt_wlen,
1153 .maxlen = sizeof(int),
1154 .mode = 0644,
1155 .proc_handler = proc_dointvec_minmax,
1156 .extra1 = &zero,
1157 .extra2 = &one_day_secs
1158 },
1159 {
1160 .procname = "tcp_autocorking",
1161 .data = &init_net.ipv4.sysctl_tcp_autocorking,
1162 .maxlen = sizeof(int),
1163 .mode = 0644,
1164 .proc_handler = proc_dointvec_minmax,
1165 .extra1 = &zero,
1166 .extra2 = &one,
1167 },
1168 {
1169 .procname = "tcp_invalid_ratelimit",
1170 .data = &init_net.ipv4.sysctl_tcp_invalid_ratelimit,
1171 .maxlen = sizeof(int),
1172 .mode = 0644,
1173 .proc_handler = proc_dointvec_ms_jiffies,
1174 },
1175 {
1176 .procname = "tcp_pacing_ss_ratio",
1177 .data = &init_net.ipv4.sysctl_tcp_pacing_ss_ratio,
1178 .maxlen = sizeof(int),
1179 .mode = 0644,
1180 .proc_handler = proc_dointvec_minmax,
1181 .extra1 = &zero,
1182 .extra2 = &thousand,
1183 },
1184 {
1185 .procname = "tcp_pacing_ca_ratio",
1186 .data = &init_net.ipv4.sysctl_tcp_pacing_ca_ratio,
1187 .maxlen = sizeof(int),
1188 .mode = 0644,
1189 .proc_handler = proc_dointvec_minmax,
1190 .extra1 = &zero,
1191 .extra2 = &thousand,
1192 },
1193 {
1194 .procname = "tcp_wmem",
1195 .data = &init_net.ipv4.sysctl_tcp_wmem,
1196 .maxlen = sizeof(init_net.ipv4.sysctl_tcp_wmem),
1197 .mode = 0644,
1198 .proc_handler = proc_dointvec_minmax,
1199 .extra1 = &one,
1200 },
1201 {
1202 .procname = "tcp_rmem",
1203 .data = &init_net.ipv4.sysctl_tcp_rmem,
1204 .maxlen = sizeof(init_net.ipv4.sysctl_tcp_rmem),
1205 .mode = 0644,
1206 .proc_handler = proc_dointvec_minmax,
1207 .extra1 = &one,
1208 },
1209 {
1210 .procname = "tcp_comp_sack_delay_ns",
1211 .data = &init_net.ipv4.sysctl_tcp_comp_sack_delay_ns,
1212 .maxlen = sizeof(unsigned long),
1213 .mode = 0644,
1214 .proc_handler = proc_doulongvec_minmax,
1215 },
1216 {
1217 .procname = "tcp_comp_sack_nr",
1218 .data = &init_net.ipv4.sysctl_tcp_comp_sack_nr,
1219 .maxlen = sizeof(int),
1220 .mode = 0644,
1221 .proc_handler = proc_dointvec_minmax,
1222 .extra1 = &zero,
1223 .extra2 = &comp_sack_nr_max,
1224 },
1225 {
1226 .procname = "udp_rmem_min",
1227 .data = &init_net.ipv4.sysctl_udp_rmem_min,
1228 .maxlen = sizeof(init_net.ipv4.sysctl_udp_rmem_min),
1229 .mode = 0644,
1230 .proc_handler = proc_dointvec_minmax,
1231 .extra1 = &one
1232 },
1233 {
1234 .procname = "udp_wmem_min",
1235 .data = &init_net.ipv4.sysctl_udp_wmem_min,
1236 .maxlen = sizeof(init_net.ipv4.sysctl_udp_wmem_min),
1237 .mode = 0644,
1238 .proc_handler = proc_dointvec_minmax,
1239 .extra1 = &one
1240 },
1241 { }
1242 };
1243
ipv4_sysctl_init_net(struct net * net)1244 static __net_init int ipv4_sysctl_init_net(struct net *net)
1245 {
1246 struct ctl_table *table;
1247
1248 table = ipv4_net_table;
1249 if (!net_eq(net, &init_net)) {
1250 int i;
1251
1252 table = kmemdup(table, sizeof(ipv4_net_table), GFP_KERNEL);
1253 if (!table)
1254 goto err_alloc;
1255
1256 /* Update the variables to point into the current struct net */
1257 for (i = 0; i < ARRAY_SIZE(ipv4_net_table) - 1; i++)
1258 table[i].data += (void *)net - (void *)&init_net;
1259 }
1260
1261 net->ipv4.ipv4_hdr = register_net_sysctl(net, "net/ipv4", table);
1262 if (!net->ipv4.ipv4_hdr)
1263 goto err_reg;
1264
1265 net->ipv4.sysctl_local_reserved_ports = kzalloc(65536 / 8, GFP_KERNEL);
1266 if (!net->ipv4.sysctl_local_reserved_ports)
1267 goto err_ports;
1268
1269 return 0;
1270
1271 err_ports:
1272 unregister_net_sysctl_table(net->ipv4.ipv4_hdr);
1273 err_reg:
1274 if (!net_eq(net, &init_net))
1275 kfree(table);
1276 err_alloc:
1277 return -ENOMEM;
1278 }
1279
ipv4_sysctl_exit_net(struct net * net)1280 static __net_exit void ipv4_sysctl_exit_net(struct net *net)
1281 {
1282 struct ctl_table *table;
1283
1284 kfree(net->ipv4.sysctl_local_reserved_ports);
1285 table = net->ipv4.ipv4_hdr->ctl_table_arg;
1286 unregister_net_sysctl_table(net->ipv4.ipv4_hdr);
1287 kfree(table);
1288 }
1289
1290 static __net_initdata struct pernet_operations ipv4_sysctl_ops = {
1291 .init = ipv4_sysctl_init_net,
1292 .exit = ipv4_sysctl_exit_net,
1293 };
1294
sysctl_ipv4_init(void)1295 static __init int sysctl_ipv4_init(void)
1296 {
1297 struct ctl_table_header *hdr;
1298
1299 hdr = register_net_sysctl(&init_net, "net/ipv4", ipv4_table);
1300 if (!hdr)
1301 return -ENOMEM;
1302
1303 if (register_pernet_subsys(&ipv4_sysctl_ops)) {
1304 unregister_net_sysctl_table(hdr);
1305 return -ENOMEM;
1306 }
1307
1308 return 0;
1309 }
1310
1311 __initcall(sysctl_ipv4_init);
1312