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[mirror_ubuntu-zesty-kernel.git] / net / ipv4 / sysctl_net_ipv4.c
1 /*
2 * sysctl_net_ipv4.c: sysctl interface to net IPV4 subsystem.
3 *
4 * Begun April 1, 1996, Mike Shaver.
5 * Added /proc/sys/net/ipv4 directory entry (empty =) ). [MS]
6 */
7
8 #include <linux/mm.h>
9 #include <linux/module.h>
10 #include <linux/sysctl.h>
11 #include <linux/igmp.h>
12 #include <linux/inetdevice.h>
13 #include <linux/seqlock.h>
14 #include <linux/init.h>
15 #include <linux/slab.h>
16 #include <linux/nsproxy.h>
17 #include <linux/swap.h>
18 #include <net/snmp.h>
19 #include <net/icmp.h>
20 #include <net/ip.h>
21 #include <net/route.h>
22 #include <net/tcp.h>
23 #include <net/udp.h>
24 #include <net/cipso_ipv4.h>
25 #include <net/inet_frag.h>
26 #include <net/ping.h>
27
28 static int zero;
29 static int one = 1;
30 static int four = 4;
31 static int thousand = 1000;
32 static int gso_max_segs = GSO_MAX_SEGS;
33 static int tcp_retr1_max = 255;
34 static int ip_local_port_range_min[] = { 1, 1 };
35 static int ip_local_port_range_max[] = { 65535, 65535 };
36 static int tcp_adv_win_scale_min = -31;
37 static int tcp_adv_win_scale_max = 31;
38 static int ip_ttl_min = 1;
39 static int ip_ttl_max = 255;
40 static int tcp_syn_retries_min = 1;
41 static int tcp_syn_retries_max = MAX_TCP_SYNCNT;
42 static int ip_ping_group_range_min[] = { 0, 0 };
43 static int ip_ping_group_range_max[] = { GID_T_MAX, GID_T_MAX };
44
45 /* Update system visible IP port range */
46 static void set_local_port_range(struct net *net, int range[2])
47 {
48 bool same_parity = !((range[0] ^ range[1]) & 1);
49
50 write_seqlock_bh(&net->ipv4.ip_local_ports.lock);
51 if (same_parity && !net->ipv4.ip_local_ports.warned) {
52 net->ipv4.ip_local_ports.warned = true;
53 pr_err_ratelimited("ip_local_port_range: prefer different parity for start/end values.\n");
54 }
55 net->ipv4.ip_local_ports.range[0] = range[0];
56 net->ipv4.ip_local_ports.range[1] = range[1];
57 write_sequnlock_bh(&net->ipv4.ip_local_ports.lock);
58 }
59
60 /* Validate changes from /proc interface. */
61 static int ipv4_local_port_range(struct ctl_table *table, int write,
62 void __user *buffer,
63 size_t *lenp, loff_t *ppos)
64 {
65 struct net *net =
66 container_of(table->data, struct net, ipv4.ip_local_ports.range);
67 int ret;
68 int range[2];
69 struct ctl_table tmp = {
70 .data = &range,
71 .maxlen = sizeof(range),
72 .mode = table->mode,
73 .extra1 = &ip_local_port_range_min,
74 .extra2 = &ip_local_port_range_max,
75 };
76
77 inet_get_local_port_range(net, &range[0], &range[1]);
78
79 ret = proc_dointvec_minmax(&tmp, write, buffer, lenp, ppos);
80
81 if (write && ret == 0) {
82 if (range[1] < range[0])
83 ret = -EINVAL;
84 else
85 set_local_port_range(net, range);
86 }
87
88 return ret;
89 }
90
91
92 static void inet_get_ping_group_range_table(struct ctl_table *table, kgid_t *low, kgid_t *high)
93 {
94 kgid_t *data = table->data;
95 struct net *net =
96 container_of(table->data, struct net, ipv4.ping_group_range.range);
97 unsigned int seq;
98 do {
99 seq = read_seqbegin(&net->ipv4.ip_local_ports.lock);
100
101 *low = data[0];
102 *high = data[1];
103 } while (read_seqretry(&net->ipv4.ip_local_ports.lock, seq));
104 }
105
106 /* Update system visible IP port range */
107 static void set_ping_group_range(struct ctl_table *table, kgid_t low, kgid_t high)
108 {
109 kgid_t *data = table->data;
110 struct net *net =
111 container_of(table->data, struct net, ipv4.ping_group_range.range);
112 write_seqlock(&net->ipv4.ip_local_ports.lock);
113 data[0] = low;
114 data[1] = high;
115 write_sequnlock(&net->ipv4.ip_local_ports.lock);
116 }
117
118 /* Validate changes from /proc interface. */
119 static int ipv4_ping_group_range(struct ctl_table *table, int write,
120 void __user *buffer,
121 size_t *lenp, loff_t *ppos)
122 {
123 struct user_namespace *user_ns = current_user_ns();
124 int ret;
125 gid_t urange[2];
126 kgid_t low, high;
127 struct ctl_table tmp = {
128 .data = &urange,
129 .maxlen = sizeof(urange),
130 .mode = table->mode,
131 .extra1 = &ip_ping_group_range_min,
132 .extra2 = &ip_ping_group_range_max,
133 };
134
135 inet_get_ping_group_range_table(table, &low, &high);
136 urange[0] = from_kgid_munged(user_ns, low);
137 urange[1] = from_kgid_munged(user_ns, high);
138 ret = proc_dointvec_minmax(&tmp, write, buffer, lenp, ppos);
139
140 if (write && ret == 0) {
141 low = make_kgid(user_ns, urange[0]);
142 high = make_kgid(user_ns, urange[1]);
143 if (!gid_valid(low) || !gid_valid(high) ||
144 (urange[1] < urange[0]) || gid_lt(high, low)) {
145 low = make_kgid(&init_user_ns, 1);
146 high = make_kgid(&init_user_ns, 0);
147 }
148 set_ping_group_range(table, low, high);
149 }
150
151 return ret;
152 }
153
154 static int proc_tcp_congestion_control(struct ctl_table *ctl, int write,
155 void __user *buffer, size_t *lenp, loff_t *ppos)
156 {
157 char val[TCP_CA_NAME_MAX];
158 struct ctl_table tbl = {
159 .data = val,
160 .maxlen = TCP_CA_NAME_MAX,
161 };
162 int ret;
163
164 tcp_get_default_congestion_control(val);
165
166 ret = proc_dostring(&tbl, write, buffer, lenp, ppos);
167 if (write && ret == 0)
168 ret = tcp_set_default_congestion_control(val);
169 return ret;
170 }
171
172 static int proc_tcp_available_congestion_control(struct ctl_table *ctl,
173 int write,
174 void __user *buffer, size_t *lenp,
175 loff_t *ppos)
176 {
177 struct ctl_table tbl = { .maxlen = TCP_CA_BUF_MAX, };
178 int ret;
179
180 tbl.data = kmalloc(tbl.maxlen, GFP_USER);
181 if (!tbl.data)
182 return -ENOMEM;
183 tcp_get_available_congestion_control(tbl.data, TCP_CA_BUF_MAX);
184 ret = proc_dostring(&tbl, write, buffer, lenp, ppos);
185 kfree(tbl.data);
186 return ret;
187 }
188
189 static int proc_allowed_congestion_control(struct ctl_table *ctl,
190 int write,
191 void __user *buffer, size_t *lenp,
192 loff_t *ppos)
193 {
194 struct ctl_table tbl = { .maxlen = TCP_CA_BUF_MAX };
195 int ret;
196
197 tbl.data = kmalloc(tbl.maxlen, GFP_USER);
198 if (!tbl.data)
199 return -ENOMEM;
200
201 tcp_get_allowed_congestion_control(tbl.data, tbl.maxlen);
202 ret = proc_dostring(&tbl, write, buffer, lenp, ppos);
203 if (write && ret == 0)
204 ret = tcp_set_allowed_congestion_control(tbl.data);
205 kfree(tbl.data);
206 return ret;
207 }
208
209 static int proc_tcp_fastopen_key(struct ctl_table *ctl, int write,
210 void __user *buffer, size_t *lenp,
211 loff_t *ppos)
212 {
213 struct ctl_table tbl = { .maxlen = (TCP_FASTOPEN_KEY_LENGTH * 2 + 10) };
214 struct tcp_fastopen_context *ctxt;
215 int ret;
216 u32 user_key[4]; /* 16 bytes, matching TCP_FASTOPEN_KEY_LENGTH */
217
218 tbl.data = kmalloc(tbl.maxlen, GFP_KERNEL);
219 if (!tbl.data)
220 return -ENOMEM;
221
222 rcu_read_lock();
223 ctxt = rcu_dereference(tcp_fastopen_ctx);
224 if (ctxt)
225 memcpy(user_key, ctxt->key, TCP_FASTOPEN_KEY_LENGTH);
226 else
227 memset(user_key, 0, sizeof(user_key));
228 rcu_read_unlock();
229
230 snprintf(tbl.data, tbl.maxlen, "%08x-%08x-%08x-%08x",
231 user_key[0], user_key[1], user_key[2], user_key[3]);
232 ret = proc_dostring(&tbl, write, buffer, lenp, ppos);
233
234 if (write && ret == 0) {
235 if (sscanf(tbl.data, "%x-%x-%x-%x", user_key, user_key + 1,
236 user_key + 2, user_key + 3) != 4) {
237 ret = -EINVAL;
238 goto bad_key;
239 }
240 /* Generate a dummy secret but don't publish it. This
241 * is needed so we don't regenerate a new key on the
242 * first invocation of tcp_fastopen_cookie_gen
243 */
244 tcp_fastopen_init_key_once(false);
245 tcp_fastopen_reset_cipher(user_key, TCP_FASTOPEN_KEY_LENGTH);
246 }
247
248 bad_key:
249 pr_debug("proc FO key set 0x%x-%x-%x-%x <- 0x%s: %u\n",
250 user_key[0], user_key[1], user_key[2], user_key[3],
251 (char *)tbl.data, ret);
252 kfree(tbl.data);
253 return ret;
254 }
255
256 static struct ctl_table ipv4_table[] = {
257 {
258 .procname = "tcp_timestamps",
259 .data = &sysctl_tcp_timestamps,
260 .maxlen = sizeof(int),
261 .mode = 0644,
262 .proc_handler = proc_dointvec
263 },
264 {
265 .procname = "tcp_window_scaling",
266 .data = &sysctl_tcp_window_scaling,
267 .maxlen = sizeof(int),
268 .mode = 0644,
269 .proc_handler = proc_dointvec
270 },
271 {
272 .procname = "tcp_sack",
273 .data = &sysctl_tcp_sack,
274 .maxlen = sizeof(int),
275 .mode = 0644,
276 .proc_handler = proc_dointvec
277 },
278 {
279 .procname = "tcp_retrans_collapse",
280 .data = &sysctl_tcp_retrans_collapse,
281 .maxlen = sizeof(int),
282 .mode = 0644,
283 .proc_handler = proc_dointvec
284 },
285 {
286 .procname = "ip_default_ttl",
287 .data = &sysctl_ip_default_ttl,
288 .maxlen = sizeof(int),
289 .mode = 0644,
290 .proc_handler = proc_dointvec_minmax,
291 .extra1 = &ip_ttl_min,
292 .extra2 = &ip_ttl_max,
293 },
294 {
295 .procname = "tcp_max_orphans",
296 .data = &sysctl_tcp_max_orphans,
297 .maxlen = sizeof(int),
298 .mode = 0644,
299 .proc_handler = proc_dointvec
300 },
301 {
302 .procname = "tcp_max_tw_buckets",
303 .data = &tcp_death_row.sysctl_max_tw_buckets,
304 .maxlen = sizeof(int),
305 .mode = 0644,
306 .proc_handler = proc_dointvec
307 },
308 {
309 .procname = "ip_early_demux",
310 .data = &sysctl_ip_early_demux,
311 .maxlen = sizeof(int),
312 .mode = 0644,
313 .proc_handler = proc_dointvec
314 },
315 {
316 .procname = "ip_dynaddr",
317 .data = &sysctl_ip_dynaddr,
318 .maxlen = sizeof(int),
319 .mode = 0644,
320 .proc_handler = proc_dointvec
321 },
322 {
323 .procname = "tcp_fastopen",
324 .data = &sysctl_tcp_fastopen,
325 .maxlen = sizeof(int),
326 .mode = 0644,
327 .proc_handler = proc_dointvec,
328 },
329 {
330 .procname = "tcp_fastopen_key",
331 .mode = 0600,
332 .maxlen = ((TCP_FASTOPEN_KEY_LENGTH * 2) + 10),
333 .proc_handler = proc_tcp_fastopen_key,
334 },
335 {
336 .procname = "tcp_tw_recycle",
337 .data = &tcp_death_row.sysctl_tw_recycle,
338 .maxlen = sizeof(int),
339 .mode = 0644,
340 .proc_handler = proc_dointvec
341 },
342 {
343 .procname = "tcp_abort_on_overflow",
344 .data = &sysctl_tcp_abort_on_overflow,
345 .maxlen = sizeof(int),
346 .mode = 0644,
347 .proc_handler = proc_dointvec
348 },
349 {
350 .procname = "tcp_stdurg",
351 .data = &sysctl_tcp_stdurg,
352 .maxlen = sizeof(int),
353 .mode = 0644,
354 .proc_handler = proc_dointvec
355 },
356 {
357 .procname = "tcp_rfc1337",
358 .data = &sysctl_tcp_rfc1337,
359 .maxlen = sizeof(int),
360 .mode = 0644,
361 .proc_handler = proc_dointvec
362 },
363 {
364 .procname = "tcp_max_syn_backlog",
365 .data = &sysctl_max_syn_backlog,
366 .maxlen = sizeof(int),
367 .mode = 0644,
368 .proc_handler = proc_dointvec
369 },
370 {
371 .procname = "inet_peer_threshold",
372 .data = &inet_peer_threshold,
373 .maxlen = sizeof(int),
374 .mode = 0644,
375 .proc_handler = proc_dointvec
376 },
377 {
378 .procname = "inet_peer_minttl",
379 .data = &inet_peer_minttl,
380 .maxlen = sizeof(int),
381 .mode = 0644,
382 .proc_handler = proc_dointvec_jiffies,
383 },
384 {
385 .procname = "inet_peer_maxttl",
386 .data = &inet_peer_maxttl,
387 .maxlen = sizeof(int),
388 .mode = 0644,
389 .proc_handler = proc_dointvec_jiffies,
390 },
391 {
392 .procname = "tcp_fack",
393 .data = &sysctl_tcp_fack,
394 .maxlen = sizeof(int),
395 .mode = 0644,
396 .proc_handler = proc_dointvec
397 },
398 {
399 .procname = "tcp_recovery",
400 .data = &sysctl_tcp_recovery,
401 .maxlen = sizeof(int),
402 .mode = 0644,
403 .proc_handler = proc_dointvec,
404 },
405 {
406 .procname = "tcp_max_reordering",
407 .data = &sysctl_tcp_max_reordering,
408 .maxlen = sizeof(int),
409 .mode = 0644,
410 .proc_handler = proc_dointvec
411 },
412 {
413 .procname = "tcp_dsack",
414 .data = &sysctl_tcp_dsack,
415 .maxlen = sizeof(int),
416 .mode = 0644,
417 .proc_handler = proc_dointvec
418 },
419 {
420 .procname = "tcp_mem",
421 .maxlen = sizeof(sysctl_tcp_mem),
422 .data = &sysctl_tcp_mem,
423 .mode = 0644,
424 .proc_handler = proc_doulongvec_minmax,
425 },
426 {
427 .procname = "tcp_wmem",
428 .data = &sysctl_tcp_wmem,
429 .maxlen = sizeof(sysctl_tcp_wmem),
430 .mode = 0644,
431 .proc_handler = proc_dointvec_minmax,
432 .extra1 = &one,
433 },
434 {
435 .procname = "tcp_rmem",
436 .data = &sysctl_tcp_rmem,
437 .maxlen = sizeof(sysctl_tcp_rmem),
438 .mode = 0644,
439 .proc_handler = proc_dointvec_minmax,
440 .extra1 = &one,
441 },
442 {
443 .procname = "tcp_app_win",
444 .data = &sysctl_tcp_app_win,
445 .maxlen = sizeof(int),
446 .mode = 0644,
447 .proc_handler = proc_dointvec
448 },
449 {
450 .procname = "tcp_adv_win_scale",
451 .data = &sysctl_tcp_adv_win_scale,
452 .maxlen = sizeof(int),
453 .mode = 0644,
454 .proc_handler = proc_dointvec_minmax,
455 .extra1 = &tcp_adv_win_scale_min,
456 .extra2 = &tcp_adv_win_scale_max,
457 },
458 {
459 .procname = "tcp_tw_reuse",
460 .data = &sysctl_tcp_tw_reuse,
461 .maxlen = sizeof(int),
462 .mode = 0644,
463 .proc_handler = proc_dointvec
464 },
465 {
466 .procname = "tcp_frto",
467 .data = &sysctl_tcp_frto,
468 .maxlen = sizeof(int),
469 .mode = 0644,
470 .proc_handler = proc_dointvec
471 },
472 {
473 .procname = "tcp_min_rtt_wlen",
474 .data = &sysctl_tcp_min_rtt_wlen,
475 .maxlen = sizeof(int),
476 .mode = 0644,
477 .proc_handler = proc_dointvec
478 },
479 {
480 .procname = "tcp_low_latency",
481 .data = &sysctl_tcp_low_latency,
482 .maxlen = sizeof(int),
483 .mode = 0644,
484 .proc_handler = proc_dointvec
485 },
486 {
487 .procname = "tcp_no_metrics_save",
488 .data = &sysctl_tcp_nometrics_save,
489 .maxlen = sizeof(int),
490 .mode = 0644,
491 .proc_handler = proc_dointvec,
492 },
493 {
494 .procname = "tcp_moderate_rcvbuf",
495 .data = &sysctl_tcp_moderate_rcvbuf,
496 .maxlen = sizeof(int),
497 .mode = 0644,
498 .proc_handler = proc_dointvec,
499 },
500 {
501 .procname = "tcp_tso_win_divisor",
502 .data = &sysctl_tcp_tso_win_divisor,
503 .maxlen = sizeof(int),
504 .mode = 0644,
505 .proc_handler = proc_dointvec,
506 },
507 {
508 .procname = "tcp_congestion_control",
509 .mode = 0644,
510 .maxlen = TCP_CA_NAME_MAX,
511 .proc_handler = proc_tcp_congestion_control,
512 },
513 {
514 .procname = "tcp_workaround_signed_windows",
515 .data = &sysctl_tcp_workaround_signed_windows,
516 .maxlen = sizeof(int),
517 .mode = 0644,
518 .proc_handler = proc_dointvec
519 },
520 {
521 .procname = "tcp_limit_output_bytes",
522 .data = &sysctl_tcp_limit_output_bytes,
523 .maxlen = sizeof(int),
524 .mode = 0644,
525 .proc_handler = proc_dointvec
526 },
527 {
528 .procname = "tcp_challenge_ack_limit",
529 .data = &sysctl_tcp_challenge_ack_limit,
530 .maxlen = sizeof(int),
531 .mode = 0644,
532 .proc_handler = proc_dointvec
533 },
534 {
535 .procname = "tcp_slow_start_after_idle",
536 .data = &sysctl_tcp_slow_start_after_idle,
537 .maxlen = sizeof(int),
538 .mode = 0644,
539 .proc_handler = proc_dointvec
540 },
541 #ifdef CONFIG_NETLABEL
542 {
543 .procname = "cipso_cache_enable",
544 .data = &cipso_v4_cache_enabled,
545 .maxlen = sizeof(int),
546 .mode = 0644,
547 .proc_handler = proc_dointvec,
548 },
549 {
550 .procname = "cipso_cache_bucket_size",
551 .data = &cipso_v4_cache_bucketsize,
552 .maxlen = sizeof(int),
553 .mode = 0644,
554 .proc_handler = proc_dointvec,
555 },
556 {
557 .procname = "cipso_rbm_optfmt",
558 .data = &cipso_v4_rbm_optfmt,
559 .maxlen = sizeof(int),
560 .mode = 0644,
561 .proc_handler = proc_dointvec,
562 },
563 {
564 .procname = "cipso_rbm_strictvalid",
565 .data = &cipso_v4_rbm_strictvalid,
566 .maxlen = sizeof(int),
567 .mode = 0644,
568 .proc_handler = proc_dointvec,
569 },
570 #endif /* CONFIG_NETLABEL */
571 {
572 .procname = "tcp_available_congestion_control",
573 .maxlen = TCP_CA_BUF_MAX,
574 .mode = 0444,
575 .proc_handler = proc_tcp_available_congestion_control,
576 },
577 {
578 .procname = "tcp_allowed_congestion_control",
579 .maxlen = TCP_CA_BUF_MAX,
580 .mode = 0644,
581 .proc_handler = proc_allowed_congestion_control,
582 },
583 {
584 .procname = "tcp_thin_linear_timeouts",
585 .data = &sysctl_tcp_thin_linear_timeouts,
586 .maxlen = sizeof(int),
587 .mode = 0644,
588 .proc_handler = proc_dointvec
589 },
590 {
591 .procname = "tcp_thin_dupack",
592 .data = &sysctl_tcp_thin_dupack,
593 .maxlen = sizeof(int),
594 .mode = 0644,
595 .proc_handler = proc_dointvec
596 },
597 {
598 .procname = "tcp_early_retrans",
599 .data = &sysctl_tcp_early_retrans,
600 .maxlen = sizeof(int),
601 .mode = 0644,
602 .proc_handler = proc_dointvec_minmax,
603 .extra1 = &zero,
604 .extra2 = &four,
605 },
606 {
607 .procname = "tcp_min_tso_segs",
608 .data = &sysctl_tcp_min_tso_segs,
609 .maxlen = sizeof(int),
610 .mode = 0644,
611 .proc_handler = proc_dointvec_minmax,
612 .extra1 = &one,
613 .extra2 = &gso_max_segs,
614 },
615 {
616 .procname = "tcp_pacing_ss_ratio",
617 .data = &sysctl_tcp_pacing_ss_ratio,
618 .maxlen = sizeof(int),
619 .mode = 0644,
620 .proc_handler = proc_dointvec_minmax,
621 .extra1 = &zero,
622 .extra2 = &thousand,
623 },
624 {
625 .procname = "tcp_pacing_ca_ratio",
626 .data = &sysctl_tcp_pacing_ca_ratio,
627 .maxlen = sizeof(int),
628 .mode = 0644,
629 .proc_handler = proc_dointvec_minmax,
630 .extra1 = &zero,
631 .extra2 = &thousand,
632 },
633 {
634 .procname = "tcp_autocorking",
635 .data = &sysctl_tcp_autocorking,
636 .maxlen = sizeof(int),
637 .mode = 0644,
638 .proc_handler = proc_dointvec_minmax,
639 .extra1 = &zero,
640 .extra2 = &one,
641 },
642 {
643 .procname = "tcp_invalid_ratelimit",
644 .data = &sysctl_tcp_invalid_ratelimit,
645 .maxlen = sizeof(int),
646 .mode = 0644,
647 .proc_handler = proc_dointvec_ms_jiffies,
648 },
649 {
650 .procname = "icmp_msgs_per_sec",
651 .data = &sysctl_icmp_msgs_per_sec,
652 .maxlen = sizeof(int),
653 .mode = 0644,
654 .proc_handler = proc_dointvec_minmax,
655 .extra1 = &zero,
656 },
657 {
658 .procname = "icmp_msgs_burst",
659 .data = &sysctl_icmp_msgs_burst,
660 .maxlen = sizeof(int),
661 .mode = 0644,
662 .proc_handler = proc_dointvec_minmax,
663 .extra1 = &zero,
664 },
665 {
666 .procname = "udp_mem",
667 .data = &sysctl_udp_mem,
668 .maxlen = sizeof(sysctl_udp_mem),
669 .mode = 0644,
670 .proc_handler = proc_doulongvec_minmax,
671 },
672 {
673 .procname = "udp_rmem_min",
674 .data = &sysctl_udp_rmem_min,
675 .maxlen = sizeof(sysctl_udp_rmem_min),
676 .mode = 0644,
677 .proc_handler = proc_dointvec_minmax,
678 .extra1 = &one
679 },
680 {
681 .procname = "udp_wmem_min",
682 .data = &sysctl_udp_wmem_min,
683 .maxlen = sizeof(sysctl_udp_wmem_min),
684 .mode = 0644,
685 .proc_handler = proc_dointvec_minmax,
686 .extra1 = &one
687 },
688 { }
689 };
690
691 static struct ctl_table ipv4_net_table[] = {
692 {
693 .procname = "icmp_echo_ignore_all",
694 .data = &init_net.ipv4.sysctl_icmp_echo_ignore_all,
695 .maxlen = sizeof(int),
696 .mode = 0644,
697 .proc_handler = proc_dointvec
698 },
699 {
700 .procname = "icmp_echo_ignore_broadcasts",
701 .data = &init_net.ipv4.sysctl_icmp_echo_ignore_broadcasts,
702 .maxlen = sizeof(int),
703 .mode = 0644,
704 .proc_handler = proc_dointvec
705 },
706 {
707 .procname = "icmp_ignore_bogus_error_responses",
708 .data = &init_net.ipv4.sysctl_icmp_ignore_bogus_error_responses,
709 .maxlen = sizeof(int),
710 .mode = 0644,
711 .proc_handler = proc_dointvec
712 },
713 {
714 .procname = "icmp_errors_use_inbound_ifaddr",
715 .data = &init_net.ipv4.sysctl_icmp_errors_use_inbound_ifaddr,
716 .maxlen = sizeof(int),
717 .mode = 0644,
718 .proc_handler = proc_dointvec
719 },
720 {
721 .procname = "icmp_ratelimit",
722 .data = &init_net.ipv4.sysctl_icmp_ratelimit,
723 .maxlen = sizeof(int),
724 .mode = 0644,
725 .proc_handler = proc_dointvec_ms_jiffies,
726 },
727 {
728 .procname = "icmp_ratemask",
729 .data = &init_net.ipv4.sysctl_icmp_ratemask,
730 .maxlen = sizeof(int),
731 .mode = 0644,
732 .proc_handler = proc_dointvec
733 },
734 {
735 .procname = "ping_group_range",
736 .data = &init_net.ipv4.ping_group_range.range,
737 .maxlen = sizeof(gid_t)*2,
738 .mode = 0644,
739 .proc_handler = ipv4_ping_group_range,
740 },
741 {
742 .procname = "tcp_ecn",
743 .data = &init_net.ipv4.sysctl_tcp_ecn,
744 .maxlen = sizeof(int),
745 .mode = 0644,
746 .proc_handler = proc_dointvec
747 },
748 {
749 .procname = "tcp_ecn_fallback",
750 .data = &init_net.ipv4.sysctl_tcp_ecn_fallback,
751 .maxlen = sizeof(int),
752 .mode = 0644,
753 .proc_handler = proc_dointvec
754 },
755 {
756 .procname = "ip_local_port_range",
757 .maxlen = sizeof(init_net.ipv4.ip_local_ports.range),
758 .data = &init_net.ipv4.ip_local_ports.range,
759 .mode = 0644,
760 .proc_handler = ipv4_local_port_range,
761 },
762 {
763 .procname = "ip_local_reserved_ports",
764 .data = &init_net.ipv4.sysctl_local_reserved_ports,
765 .maxlen = 65536,
766 .mode = 0644,
767 .proc_handler = proc_do_large_bitmap,
768 },
769 {
770 .procname = "ip_no_pmtu_disc",
771 .data = &init_net.ipv4.sysctl_ip_no_pmtu_disc,
772 .maxlen = sizeof(int),
773 .mode = 0644,
774 .proc_handler = proc_dointvec
775 },
776 {
777 .procname = "ip_forward_use_pmtu",
778 .data = &init_net.ipv4.sysctl_ip_fwd_use_pmtu,
779 .maxlen = sizeof(int),
780 .mode = 0644,
781 .proc_handler = proc_dointvec,
782 },
783 {
784 .procname = "ip_nonlocal_bind",
785 .data = &init_net.ipv4.sysctl_ip_nonlocal_bind,
786 .maxlen = sizeof(int),
787 .mode = 0644,
788 .proc_handler = proc_dointvec
789 },
790 {
791 .procname = "fwmark_reflect",
792 .data = &init_net.ipv4.sysctl_fwmark_reflect,
793 .maxlen = sizeof(int),
794 .mode = 0644,
795 .proc_handler = proc_dointvec,
796 },
797 {
798 .procname = "tcp_fwmark_accept",
799 .data = &init_net.ipv4.sysctl_tcp_fwmark_accept,
800 .maxlen = sizeof(int),
801 .mode = 0644,
802 .proc_handler = proc_dointvec,
803 },
804 #ifdef CONFIG_NET_L3_MASTER_DEV
805 {
806 .procname = "tcp_l3mdev_accept",
807 .data = &init_net.ipv4.sysctl_tcp_l3mdev_accept,
808 .maxlen = sizeof(int),
809 .mode = 0644,
810 .proc_handler = proc_dointvec_minmax,
811 .extra1 = &zero,
812 .extra2 = &one,
813 },
814 #endif
815 {
816 .procname = "tcp_mtu_probing",
817 .data = &init_net.ipv4.sysctl_tcp_mtu_probing,
818 .maxlen = sizeof(int),
819 .mode = 0644,
820 .proc_handler = proc_dointvec,
821 },
822 {
823 .procname = "tcp_base_mss",
824 .data = &init_net.ipv4.sysctl_tcp_base_mss,
825 .maxlen = sizeof(int),
826 .mode = 0644,
827 .proc_handler = proc_dointvec,
828 },
829 {
830 .procname = "tcp_probe_threshold",
831 .data = &init_net.ipv4.sysctl_tcp_probe_threshold,
832 .maxlen = sizeof(int),
833 .mode = 0644,
834 .proc_handler = proc_dointvec,
835 },
836 {
837 .procname = "tcp_probe_interval",
838 .data = &init_net.ipv4.sysctl_tcp_probe_interval,
839 .maxlen = sizeof(int),
840 .mode = 0644,
841 .proc_handler = proc_dointvec,
842 },
843 {
844 .procname = "igmp_link_local_mcast_reports",
845 .data = &init_net.ipv4.sysctl_igmp_llm_reports,
846 .maxlen = sizeof(int),
847 .mode = 0644,
848 .proc_handler = proc_dointvec
849 },
850 {
851 .procname = "igmp_max_memberships",
852 .data = &init_net.ipv4.sysctl_igmp_max_memberships,
853 .maxlen = sizeof(int),
854 .mode = 0644,
855 .proc_handler = proc_dointvec
856 },
857 {
858 .procname = "igmp_max_msf",
859 .data = &init_net.ipv4.sysctl_igmp_max_msf,
860 .maxlen = sizeof(int),
861 .mode = 0644,
862 .proc_handler = proc_dointvec
863 },
864 #ifdef CONFIG_IP_MULTICAST
865 {
866 .procname = "igmp_qrv",
867 .data = &init_net.ipv4.sysctl_igmp_qrv,
868 .maxlen = sizeof(int),
869 .mode = 0644,
870 .proc_handler = proc_dointvec_minmax,
871 .extra1 = &one
872 },
873 #endif
874 {
875 .procname = "tcp_keepalive_time",
876 .data = &init_net.ipv4.sysctl_tcp_keepalive_time,
877 .maxlen = sizeof(int),
878 .mode = 0644,
879 .proc_handler = proc_dointvec_jiffies,
880 },
881 {
882 .procname = "tcp_keepalive_probes",
883 .data = &init_net.ipv4.sysctl_tcp_keepalive_probes,
884 .maxlen = sizeof(int),
885 .mode = 0644,
886 .proc_handler = proc_dointvec
887 },
888 {
889 .procname = "tcp_keepalive_intvl",
890 .data = &init_net.ipv4.sysctl_tcp_keepalive_intvl,
891 .maxlen = sizeof(int),
892 .mode = 0644,
893 .proc_handler = proc_dointvec_jiffies,
894 },
895 {
896 .procname = "tcp_syn_retries",
897 .data = &init_net.ipv4.sysctl_tcp_syn_retries,
898 .maxlen = sizeof(int),
899 .mode = 0644,
900 .proc_handler = proc_dointvec_minmax,
901 .extra1 = &tcp_syn_retries_min,
902 .extra2 = &tcp_syn_retries_max
903 },
904 {
905 .procname = "tcp_synack_retries",
906 .data = &init_net.ipv4.sysctl_tcp_synack_retries,
907 .maxlen = sizeof(int),
908 .mode = 0644,
909 .proc_handler = proc_dointvec
910 },
911 #ifdef CONFIG_SYN_COOKIES
912 {
913 .procname = "tcp_syncookies",
914 .data = &init_net.ipv4.sysctl_tcp_syncookies,
915 .maxlen = sizeof(int),
916 .mode = 0644,
917 .proc_handler = proc_dointvec
918 },
919 #endif
920 {
921 .procname = "tcp_reordering",
922 .data = &init_net.ipv4.sysctl_tcp_reordering,
923 .maxlen = sizeof(int),
924 .mode = 0644,
925 .proc_handler = proc_dointvec
926 },
927 {
928 .procname = "tcp_retries1",
929 .data = &init_net.ipv4.sysctl_tcp_retries1,
930 .maxlen = sizeof(int),
931 .mode = 0644,
932 .proc_handler = proc_dointvec_minmax,
933 .extra2 = &tcp_retr1_max
934 },
935 {
936 .procname = "tcp_retries2",
937 .data = &init_net.ipv4.sysctl_tcp_retries2,
938 .maxlen = sizeof(int),
939 .mode = 0644,
940 .proc_handler = proc_dointvec
941 },
942 {
943 .procname = "tcp_orphan_retries",
944 .data = &init_net.ipv4.sysctl_tcp_orphan_retries,
945 .maxlen = sizeof(int),
946 .mode = 0644,
947 .proc_handler = proc_dointvec
948 },
949 {
950 .procname = "tcp_fin_timeout",
951 .data = &init_net.ipv4.sysctl_tcp_fin_timeout,
952 .maxlen = sizeof(int),
953 .mode = 0644,
954 .proc_handler = proc_dointvec_jiffies,
955 },
956 {
957 .procname = "tcp_notsent_lowat",
958 .data = &init_net.ipv4.sysctl_tcp_notsent_lowat,
959 .maxlen = sizeof(unsigned int),
960 .mode = 0644,
961 .proc_handler = proc_dointvec,
962 },
963 { }
964 };
965
966 static __net_init int ipv4_sysctl_init_net(struct net *net)
967 {
968 struct ctl_table *table;
969
970 table = ipv4_net_table;
971 if (!net_eq(net, &init_net)) {
972 int i;
973
974 table = kmemdup(table, sizeof(ipv4_net_table), GFP_KERNEL);
975 if (!table)
976 goto err_alloc;
977
978 /* Update the variables to point into the current struct net */
979 for (i = 0; i < ARRAY_SIZE(ipv4_net_table) - 1; i++)
980 table[i].data += (void *)net - (void *)&init_net;
981 }
982
983 net->ipv4.ipv4_hdr = register_net_sysctl(net, "net/ipv4", table);
984 if (!net->ipv4.ipv4_hdr)
985 goto err_reg;
986
987 net->ipv4.sysctl_local_reserved_ports = kzalloc(65536 / 8, GFP_KERNEL);
988 if (!net->ipv4.sysctl_local_reserved_ports)
989 goto err_ports;
990
991 return 0;
992
993 err_ports:
994 unregister_net_sysctl_table(net->ipv4.ipv4_hdr);
995 err_reg:
996 if (!net_eq(net, &init_net))
997 kfree(table);
998 err_alloc:
999 return -ENOMEM;
1000 }
1001
1002 static __net_exit void ipv4_sysctl_exit_net(struct net *net)
1003 {
1004 struct ctl_table *table;
1005
1006 kfree(net->ipv4.sysctl_local_reserved_ports);
1007 table = net->ipv4.ipv4_hdr->ctl_table_arg;
1008 unregister_net_sysctl_table(net->ipv4.ipv4_hdr);
1009 kfree(table);
1010 }
1011
1012 static __net_initdata struct pernet_operations ipv4_sysctl_ops = {
1013 .init = ipv4_sysctl_init_net,
1014 .exit = ipv4_sysctl_exit_net,
1015 };
1016
1017 static __init int sysctl_ipv4_init(void)
1018 {
1019 struct ctl_table_header *hdr;
1020
1021 hdr = register_net_sysctl(&init_net, "net/ipv4", ipv4_table);
1022 if (!hdr)
1023 return -ENOMEM;
1024
1025 if (register_pernet_subsys(&ipv4_sysctl_ops)) {
1026 unregister_net_sysctl_table(hdr);
1027 return -ENOMEM;
1028 }
1029
1030 return 0;
1031 }
1032
1033 __initcall(sysctl_ipv4_init);
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