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[mirror_ubuntu-artful-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 #include <net/protocol.h>
28
29 static int zero;
30 static int one = 1;
31 static int four = 4;
32 static int thousand = 1000;
33 static int gso_max_segs = GSO_MAX_SEGS;
34 static int tcp_retr1_max = 255;
35 static int ip_local_port_range_min[] = { 1, 1 };
36 static int ip_local_port_range_max[] = { 65535, 65535 };
37 static int tcp_adv_win_scale_min = -31;
38 static int tcp_adv_win_scale_max = 31;
39 static int ip_privileged_port_min;
40 static int ip_privileged_port_max = 65535;
41 static int ip_ttl_min = 1;
42 static int ip_ttl_max = 255;
43 static int tcp_syn_retries_min = 1;
44 static int tcp_syn_retries_max = MAX_TCP_SYNCNT;
45 static int ip_ping_group_range_min[] = { 0, 0 };
46 static int ip_ping_group_range_max[] = { GID_T_MAX, GID_T_MAX };
47
48 /* Update system visible IP port range */
49 static void set_local_port_range(struct net *net, int range[2])
50 {
51 bool same_parity = !((range[0] ^ range[1]) & 1);
52
53 write_seqlock_bh(&net->ipv4.ip_local_ports.lock);
54 if (same_parity && !net->ipv4.ip_local_ports.warned) {
55 net->ipv4.ip_local_ports.warned = true;
56 pr_err_ratelimited("ip_local_port_range: prefer different parity for start/end values.\n");
57 }
58 net->ipv4.ip_local_ports.range[0] = range[0];
59 net->ipv4.ip_local_ports.range[1] = range[1];
60 write_sequnlock_bh(&net->ipv4.ip_local_ports.lock);
61 }
62
63 /* Validate changes from /proc interface. */
64 static int ipv4_local_port_range(struct ctl_table *table, int write,
65 void __user *buffer,
66 size_t *lenp, loff_t *ppos)
67 {
68 struct net *net =
69 container_of(table->data, struct net, ipv4.ip_local_ports.range);
70 int ret;
71 int range[2];
72 struct ctl_table tmp = {
73 .data = &range,
74 .maxlen = sizeof(range),
75 .mode = table->mode,
76 .extra1 = &ip_local_port_range_min,
77 .extra2 = &ip_local_port_range_max,
78 };
79
80 inet_get_local_port_range(net, &range[0], &range[1]);
81
82 ret = proc_dointvec_minmax(&tmp, write, buffer, lenp, ppos);
83
84 if (write && ret == 0) {
85 /* Ensure that the upper limit is not smaller than the lower,
86 * and that the lower does not encroach upon the privileged
87 * port limit.
88 */
89 if ((range[1] < range[0]) ||
90 (range[0] < net->ipv4.sysctl_ip_prot_sock))
91 ret = -EINVAL;
92 else
93 set_local_port_range(net, range);
94 }
95
96 return ret;
97 }
98
99 /* Validate changes from /proc interface. */
100 static int ipv4_privileged_ports(struct ctl_table *table, int write,
101 void __user *buffer, size_t *lenp, loff_t *ppos)
102 {
103 struct net *net = container_of(table->data, struct net,
104 ipv4.sysctl_ip_prot_sock);
105 int ret;
106 int pports;
107 int range[2];
108 struct ctl_table tmp = {
109 .data = &pports,
110 .maxlen = sizeof(pports),
111 .mode = table->mode,
112 .extra1 = &ip_privileged_port_min,
113 .extra2 = &ip_privileged_port_max,
114 };
115
116 pports = net->ipv4.sysctl_ip_prot_sock;
117
118 ret = proc_dointvec_minmax(&tmp, write, buffer, lenp, ppos);
119
120 if (write && ret == 0) {
121 inet_get_local_port_range(net, &range[0], &range[1]);
122 /* Ensure that the local port range doesn't overlap with the
123 * privileged port range.
124 */
125 if (range[0] < pports)
126 ret = -EINVAL;
127 else
128 net->ipv4.sysctl_ip_prot_sock = pports;
129 }
130
131 return ret;
132 }
133
134 static void inet_get_ping_group_range_table(struct ctl_table *table, kgid_t *low, kgid_t *high)
135 {
136 kgid_t *data = table->data;
137 struct net *net =
138 container_of(table->data, struct net, ipv4.ping_group_range.range);
139 unsigned int seq;
140 do {
141 seq = read_seqbegin(&net->ipv4.ping_group_range.lock);
142
143 *low = data[0];
144 *high = data[1];
145 } while (read_seqretry(&net->ipv4.ping_group_range.lock, seq));
146 }
147
148 /* Update system visible IP port range */
149 static void set_ping_group_range(struct ctl_table *table, kgid_t low, kgid_t high)
150 {
151 kgid_t *data = table->data;
152 struct net *net =
153 container_of(table->data, struct net, ipv4.ping_group_range.range);
154 write_seqlock(&net->ipv4.ping_group_range.lock);
155 data[0] = low;
156 data[1] = high;
157 write_sequnlock(&net->ipv4.ping_group_range.lock);
158 }
159
160 /* Validate changes from /proc interface. */
161 static int ipv4_ping_group_range(struct ctl_table *table, int write,
162 void __user *buffer,
163 size_t *lenp, loff_t *ppos)
164 {
165 struct user_namespace *user_ns = current_user_ns();
166 int ret;
167 gid_t urange[2];
168 kgid_t low, high;
169 struct ctl_table tmp = {
170 .data = &urange,
171 .maxlen = sizeof(urange),
172 .mode = table->mode,
173 .extra1 = &ip_ping_group_range_min,
174 .extra2 = &ip_ping_group_range_max,
175 };
176
177 inet_get_ping_group_range_table(table, &low, &high);
178 urange[0] = from_kgid_munged(user_ns, low);
179 urange[1] = from_kgid_munged(user_ns, high);
180 ret = proc_dointvec_minmax(&tmp, write, buffer, lenp, ppos);
181
182 if (write && ret == 0) {
183 low = make_kgid(user_ns, urange[0]);
184 high = make_kgid(user_ns, urange[1]);
185 if (!gid_valid(low) || !gid_valid(high) ||
186 (urange[1] < urange[0]) || gid_lt(high, low)) {
187 low = make_kgid(&init_user_ns, 1);
188 high = make_kgid(&init_user_ns, 0);
189 }
190 set_ping_group_range(table, low, high);
191 }
192
193 return ret;
194 }
195
196 static int proc_tcp_congestion_control(struct ctl_table *ctl, int write,
197 void __user *buffer, size_t *lenp, loff_t *ppos)
198 {
199 char val[TCP_CA_NAME_MAX];
200 struct ctl_table tbl = {
201 .data = val,
202 .maxlen = TCP_CA_NAME_MAX,
203 };
204 int ret;
205
206 tcp_get_default_congestion_control(val);
207
208 ret = proc_dostring(&tbl, write, buffer, lenp, ppos);
209 if (write && ret == 0)
210 ret = tcp_set_default_congestion_control(val);
211 return ret;
212 }
213
214 static int proc_tcp_available_congestion_control(struct ctl_table *ctl,
215 int write,
216 void __user *buffer, size_t *lenp,
217 loff_t *ppos)
218 {
219 struct ctl_table tbl = { .maxlen = TCP_CA_BUF_MAX, };
220 int ret;
221
222 tbl.data = kmalloc(tbl.maxlen, GFP_USER);
223 if (!tbl.data)
224 return -ENOMEM;
225 tcp_get_available_congestion_control(tbl.data, TCP_CA_BUF_MAX);
226 ret = proc_dostring(&tbl, write, buffer, lenp, ppos);
227 kfree(tbl.data);
228 return ret;
229 }
230
231 static int proc_allowed_congestion_control(struct ctl_table *ctl,
232 int write,
233 void __user *buffer, size_t *lenp,
234 loff_t *ppos)
235 {
236 struct ctl_table tbl = { .maxlen = TCP_CA_BUF_MAX };
237 int ret;
238
239 tbl.data = kmalloc(tbl.maxlen, GFP_USER);
240 if (!tbl.data)
241 return -ENOMEM;
242
243 tcp_get_allowed_congestion_control(tbl.data, tbl.maxlen);
244 ret = proc_dostring(&tbl, write, buffer, lenp, ppos);
245 if (write && ret == 0)
246 ret = tcp_set_allowed_congestion_control(tbl.data);
247 kfree(tbl.data);
248 return ret;
249 }
250
251 static int proc_tcp_fastopen_key(struct ctl_table *ctl, int write,
252 void __user *buffer, size_t *lenp,
253 loff_t *ppos)
254 {
255 struct ctl_table tbl = { .maxlen = (TCP_FASTOPEN_KEY_LENGTH * 2 + 10) };
256 struct tcp_fastopen_context *ctxt;
257 int ret;
258 u32 user_key[4]; /* 16 bytes, matching TCP_FASTOPEN_KEY_LENGTH */
259
260 tbl.data = kmalloc(tbl.maxlen, GFP_KERNEL);
261 if (!tbl.data)
262 return -ENOMEM;
263
264 rcu_read_lock();
265 ctxt = rcu_dereference(tcp_fastopen_ctx);
266 if (ctxt)
267 memcpy(user_key, ctxt->key, TCP_FASTOPEN_KEY_LENGTH);
268 else
269 memset(user_key, 0, sizeof(user_key));
270 rcu_read_unlock();
271
272 snprintf(tbl.data, tbl.maxlen, "%08x-%08x-%08x-%08x",
273 user_key[0], user_key[1], user_key[2], user_key[3]);
274 ret = proc_dostring(&tbl, write, buffer, lenp, ppos);
275
276 if (write && ret == 0) {
277 if (sscanf(tbl.data, "%x-%x-%x-%x", user_key, user_key + 1,
278 user_key + 2, user_key + 3) != 4) {
279 ret = -EINVAL;
280 goto bad_key;
281 }
282 /* Generate a dummy secret but don't publish it. This
283 * is needed so we don't regenerate a new key on the
284 * first invocation of tcp_fastopen_cookie_gen
285 */
286 tcp_fastopen_init_key_once(false);
287 tcp_fastopen_reset_cipher(user_key, TCP_FASTOPEN_KEY_LENGTH);
288 }
289
290 bad_key:
291 pr_debug("proc FO key set 0x%x-%x-%x-%x <- 0x%s: %u\n",
292 user_key[0], user_key[1], user_key[2], user_key[3],
293 (char *)tbl.data, ret);
294 kfree(tbl.data);
295 return ret;
296 }
297
298 static void proc_configure_early_demux(int enabled, int protocol)
299 {
300 struct net_protocol *ipprot;
301 #if IS_ENABLED(CONFIG_IPV6)
302 struct inet6_protocol *ip6prot;
303 #endif
304
305 rcu_read_lock();
306
307 ipprot = rcu_dereference(inet_protos[protocol]);
308 if (ipprot)
309 ipprot->early_demux = enabled ? ipprot->early_demux_handler :
310 NULL;
311
312 #if IS_ENABLED(CONFIG_IPV6)
313 ip6prot = rcu_dereference(inet6_protos[protocol]);
314 if (ip6prot)
315 ip6prot->early_demux = enabled ? ip6prot->early_demux_handler :
316 NULL;
317 #endif
318 rcu_read_unlock();
319 }
320
321 static int proc_tcp_early_demux(struct ctl_table *table, int write,
322 void __user *buffer, size_t *lenp, loff_t *ppos)
323 {
324 int ret = 0;
325
326 ret = proc_dointvec(table, write, buffer, lenp, ppos);
327
328 if (write && !ret) {
329 int enabled = init_net.ipv4.sysctl_tcp_early_demux;
330
331 proc_configure_early_demux(enabled, IPPROTO_TCP);
332 }
333
334 return ret;
335 }
336
337 static int proc_udp_early_demux(struct ctl_table *table, int write,
338 void __user *buffer, size_t *lenp, loff_t *ppos)
339 {
340 int ret = 0;
341
342 ret = proc_dointvec(table, write, buffer, lenp, ppos);
343
344 if (write && !ret) {
345 int enabled = init_net.ipv4.sysctl_udp_early_demux;
346
347 proc_configure_early_demux(enabled, IPPROTO_UDP);
348 }
349
350 return ret;
351 }
352
353 static int proc_tfo_blackhole_detect_timeout(struct ctl_table *table,
354 int write,
355 void __user *buffer,
356 size_t *lenp, loff_t *ppos)
357 {
358 int ret;
359
360 ret = proc_dointvec_minmax(table, write, buffer, lenp, ppos);
361 if (write && ret == 0)
362 tcp_fastopen_active_timeout_reset();
363 return ret;
364 }
365
366 static struct ctl_table ipv4_table[] = {
367 {
368 .procname = "tcp_timestamps",
369 .data = &sysctl_tcp_timestamps,
370 .maxlen = sizeof(int),
371 .mode = 0644,
372 .proc_handler = proc_dointvec
373 },
374 {
375 .procname = "tcp_window_scaling",
376 .data = &sysctl_tcp_window_scaling,
377 .maxlen = sizeof(int),
378 .mode = 0644,
379 .proc_handler = proc_dointvec
380 },
381 {
382 .procname = "tcp_retrans_collapse",
383 .data = &sysctl_tcp_retrans_collapse,
384 .maxlen = sizeof(int),
385 .mode = 0644,
386 .proc_handler = proc_dointvec
387 },
388 {
389 .procname = "tcp_max_orphans",
390 .data = &sysctl_tcp_max_orphans,
391 .maxlen = sizeof(int),
392 .mode = 0644,
393 .proc_handler = proc_dointvec
394 },
395 {
396 .procname = "tcp_fastopen",
397 .data = &sysctl_tcp_fastopen,
398 .maxlen = sizeof(int),
399 .mode = 0644,
400 .proc_handler = proc_dointvec,
401 },
402 {
403 .procname = "tcp_fastopen_key",
404 .mode = 0600,
405 .maxlen = ((TCP_FASTOPEN_KEY_LENGTH * 2) + 10),
406 .proc_handler = proc_tcp_fastopen_key,
407 },
408 {
409 .procname = "tcp_fastopen_blackhole_timeout_sec",
410 .data = &sysctl_tcp_fastopen_blackhole_timeout,
411 .maxlen = sizeof(int),
412 .mode = 0644,
413 .proc_handler = proc_tfo_blackhole_detect_timeout,
414 .extra1 = &zero,
415 },
416 {
417 .procname = "tcp_abort_on_overflow",
418 .data = &sysctl_tcp_abort_on_overflow,
419 .maxlen = sizeof(int),
420 .mode = 0644,
421 .proc_handler = proc_dointvec
422 },
423 {
424 .procname = "tcp_stdurg",
425 .data = &sysctl_tcp_stdurg,
426 .maxlen = sizeof(int),
427 .mode = 0644,
428 .proc_handler = proc_dointvec
429 },
430 {
431 .procname = "tcp_rfc1337",
432 .data = &sysctl_tcp_rfc1337,
433 .maxlen = sizeof(int),
434 .mode = 0644,
435 .proc_handler = proc_dointvec
436 },
437 {
438 .procname = "inet_peer_threshold",
439 .data = &inet_peer_threshold,
440 .maxlen = sizeof(int),
441 .mode = 0644,
442 .proc_handler = proc_dointvec
443 },
444 {
445 .procname = "inet_peer_minttl",
446 .data = &inet_peer_minttl,
447 .maxlen = sizeof(int),
448 .mode = 0644,
449 .proc_handler = proc_dointvec_jiffies,
450 },
451 {
452 .procname = "inet_peer_maxttl",
453 .data = &inet_peer_maxttl,
454 .maxlen = sizeof(int),
455 .mode = 0644,
456 .proc_handler = proc_dointvec_jiffies,
457 },
458 {
459 .procname = "tcp_fack",
460 .data = &sysctl_tcp_fack,
461 .maxlen = sizeof(int),
462 .mode = 0644,
463 .proc_handler = proc_dointvec
464 },
465 {
466 .procname = "tcp_recovery",
467 .data = &sysctl_tcp_recovery,
468 .maxlen = sizeof(int),
469 .mode = 0644,
470 .proc_handler = proc_dointvec,
471 },
472 {
473 .procname = "tcp_max_reordering",
474 .data = &sysctl_tcp_max_reordering,
475 .maxlen = sizeof(int),
476 .mode = 0644,
477 .proc_handler = proc_dointvec
478 },
479 {
480 .procname = "tcp_dsack",
481 .data = &sysctl_tcp_dsack,
482 .maxlen = sizeof(int),
483 .mode = 0644,
484 .proc_handler = proc_dointvec
485 },
486 {
487 .procname = "tcp_mem",
488 .maxlen = sizeof(sysctl_tcp_mem),
489 .data = &sysctl_tcp_mem,
490 .mode = 0644,
491 .proc_handler = proc_doulongvec_minmax,
492 },
493 {
494 .procname = "tcp_wmem",
495 .data = &sysctl_tcp_wmem,
496 .maxlen = sizeof(sysctl_tcp_wmem),
497 .mode = 0644,
498 .proc_handler = proc_dointvec_minmax,
499 .extra1 = &one,
500 },
501 {
502 .procname = "tcp_rmem",
503 .data = &sysctl_tcp_rmem,
504 .maxlen = sizeof(sysctl_tcp_rmem),
505 .mode = 0644,
506 .proc_handler = proc_dointvec_minmax,
507 .extra1 = &one,
508 },
509 {
510 .procname = "tcp_app_win",
511 .data = &sysctl_tcp_app_win,
512 .maxlen = sizeof(int),
513 .mode = 0644,
514 .proc_handler = proc_dointvec
515 },
516 {
517 .procname = "tcp_adv_win_scale",
518 .data = &sysctl_tcp_adv_win_scale,
519 .maxlen = sizeof(int),
520 .mode = 0644,
521 .proc_handler = proc_dointvec_minmax,
522 .extra1 = &tcp_adv_win_scale_min,
523 .extra2 = &tcp_adv_win_scale_max,
524 },
525 {
526 .procname = "tcp_frto",
527 .data = &sysctl_tcp_frto,
528 .maxlen = sizeof(int),
529 .mode = 0644,
530 .proc_handler = proc_dointvec
531 },
532 {
533 .procname = "tcp_min_rtt_wlen",
534 .data = &sysctl_tcp_min_rtt_wlen,
535 .maxlen = sizeof(int),
536 .mode = 0644,
537 .proc_handler = proc_dointvec
538 },
539 {
540 .procname = "tcp_low_latency",
541 .data = &sysctl_tcp_low_latency,
542 .maxlen = sizeof(int),
543 .mode = 0644,
544 .proc_handler = proc_dointvec
545 },
546 {
547 .procname = "tcp_no_metrics_save",
548 .data = &sysctl_tcp_nometrics_save,
549 .maxlen = sizeof(int),
550 .mode = 0644,
551 .proc_handler = proc_dointvec,
552 },
553 {
554 .procname = "tcp_moderate_rcvbuf",
555 .data = &sysctl_tcp_moderate_rcvbuf,
556 .maxlen = sizeof(int),
557 .mode = 0644,
558 .proc_handler = proc_dointvec,
559 },
560 {
561 .procname = "tcp_tso_win_divisor",
562 .data = &sysctl_tcp_tso_win_divisor,
563 .maxlen = sizeof(int),
564 .mode = 0644,
565 .proc_handler = proc_dointvec,
566 },
567 {
568 .procname = "tcp_congestion_control",
569 .mode = 0644,
570 .maxlen = TCP_CA_NAME_MAX,
571 .proc_handler = proc_tcp_congestion_control,
572 },
573 {
574 .procname = "tcp_workaround_signed_windows",
575 .data = &sysctl_tcp_workaround_signed_windows,
576 .maxlen = sizeof(int),
577 .mode = 0644,
578 .proc_handler = proc_dointvec
579 },
580 {
581 .procname = "tcp_limit_output_bytes",
582 .data = &sysctl_tcp_limit_output_bytes,
583 .maxlen = sizeof(int),
584 .mode = 0644,
585 .proc_handler = proc_dointvec
586 },
587 {
588 .procname = "tcp_challenge_ack_limit",
589 .data = &sysctl_tcp_challenge_ack_limit,
590 .maxlen = sizeof(int),
591 .mode = 0644,
592 .proc_handler = proc_dointvec
593 },
594 {
595 .procname = "tcp_slow_start_after_idle",
596 .data = &sysctl_tcp_slow_start_after_idle,
597 .maxlen = sizeof(int),
598 .mode = 0644,
599 .proc_handler = proc_dointvec
600 },
601 #ifdef CONFIG_NETLABEL
602 {
603 .procname = "cipso_cache_enable",
604 .data = &cipso_v4_cache_enabled,
605 .maxlen = sizeof(int),
606 .mode = 0644,
607 .proc_handler = proc_dointvec,
608 },
609 {
610 .procname = "cipso_cache_bucket_size",
611 .data = &cipso_v4_cache_bucketsize,
612 .maxlen = sizeof(int),
613 .mode = 0644,
614 .proc_handler = proc_dointvec,
615 },
616 {
617 .procname = "cipso_rbm_optfmt",
618 .data = &cipso_v4_rbm_optfmt,
619 .maxlen = sizeof(int),
620 .mode = 0644,
621 .proc_handler = proc_dointvec,
622 },
623 {
624 .procname = "cipso_rbm_strictvalid",
625 .data = &cipso_v4_rbm_strictvalid,
626 .maxlen = sizeof(int),
627 .mode = 0644,
628 .proc_handler = proc_dointvec,
629 },
630 #endif /* CONFIG_NETLABEL */
631 {
632 .procname = "tcp_available_congestion_control",
633 .maxlen = TCP_CA_BUF_MAX,
634 .mode = 0444,
635 .proc_handler = proc_tcp_available_congestion_control,
636 },
637 {
638 .procname = "tcp_allowed_congestion_control",
639 .maxlen = TCP_CA_BUF_MAX,
640 .mode = 0644,
641 .proc_handler = proc_allowed_congestion_control,
642 },
643 {
644 .procname = "tcp_thin_linear_timeouts",
645 .data = &sysctl_tcp_thin_linear_timeouts,
646 .maxlen = sizeof(int),
647 .mode = 0644,
648 .proc_handler = proc_dointvec
649 },
650 {
651 .procname = "tcp_early_retrans",
652 .data = &sysctl_tcp_early_retrans,
653 .maxlen = sizeof(int),
654 .mode = 0644,
655 .proc_handler = proc_dointvec_minmax,
656 .extra1 = &zero,
657 .extra2 = &four,
658 },
659 {
660 .procname = "tcp_min_tso_segs",
661 .data = &sysctl_tcp_min_tso_segs,
662 .maxlen = sizeof(int),
663 .mode = 0644,
664 .proc_handler = proc_dointvec_minmax,
665 .extra1 = &one,
666 .extra2 = &gso_max_segs,
667 },
668 {
669 .procname = "tcp_pacing_ss_ratio",
670 .data = &sysctl_tcp_pacing_ss_ratio,
671 .maxlen = sizeof(int),
672 .mode = 0644,
673 .proc_handler = proc_dointvec_minmax,
674 .extra1 = &zero,
675 .extra2 = &thousand,
676 },
677 {
678 .procname = "tcp_pacing_ca_ratio",
679 .data = &sysctl_tcp_pacing_ca_ratio,
680 .maxlen = sizeof(int),
681 .mode = 0644,
682 .proc_handler = proc_dointvec_minmax,
683 .extra1 = &zero,
684 .extra2 = &thousand,
685 },
686 {
687 .procname = "tcp_autocorking",
688 .data = &sysctl_tcp_autocorking,
689 .maxlen = sizeof(int),
690 .mode = 0644,
691 .proc_handler = proc_dointvec_minmax,
692 .extra1 = &zero,
693 .extra2 = &one,
694 },
695 {
696 .procname = "tcp_invalid_ratelimit",
697 .data = &sysctl_tcp_invalid_ratelimit,
698 .maxlen = sizeof(int),
699 .mode = 0644,
700 .proc_handler = proc_dointvec_ms_jiffies,
701 },
702 {
703 .procname = "icmp_msgs_per_sec",
704 .data = &sysctl_icmp_msgs_per_sec,
705 .maxlen = sizeof(int),
706 .mode = 0644,
707 .proc_handler = proc_dointvec_minmax,
708 .extra1 = &zero,
709 },
710 {
711 .procname = "icmp_msgs_burst",
712 .data = &sysctl_icmp_msgs_burst,
713 .maxlen = sizeof(int),
714 .mode = 0644,
715 .proc_handler = proc_dointvec_minmax,
716 .extra1 = &zero,
717 },
718 {
719 .procname = "udp_mem",
720 .data = &sysctl_udp_mem,
721 .maxlen = sizeof(sysctl_udp_mem),
722 .mode = 0644,
723 .proc_handler = proc_doulongvec_minmax,
724 },
725 {
726 .procname = "udp_rmem_min",
727 .data = &sysctl_udp_rmem_min,
728 .maxlen = sizeof(sysctl_udp_rmem_min),
729 .mode = 0644,
730 .proc_handler = proc_dointvec_minmax,
731 .extra1 = &one
732 },
733 {
734 .procname = "udp_wmem_min",
735 .data = &sysctl_udp_wmem_min,
736 .maxlen = sizeof(sysctl_udp_wmem_min),
737 .mode = 0644,
738 .proc_handler = proc_dointvec_minmax,
739 .extra1 = &one
740 },
741 { }
742 };
743
744 static struct ctl_table ipv4_net_table[] = {
745 {
746 .procname = "icmp_echo_ignore_all",
747 .data = &init_net.ipv4.sysctl_icmp_echo_ignore_all,
748 .maxlen = sizeof(int),
749 .mode = 0644,
750 .proc_handler = proc_dointvec
751 },
752 {
753 .procname = "icmp_echo_ignore_broadcasts",
754 .data = &init_net.ipv4.sysctl_icmp_echo_ignore_broadcasts,
755 .maxlen = sizeof(int),
756 .mode = 0644,
757 .proc_handler = proc_dointvec
758 },
759 {
760 .procname = "icmp_ignore_bogus_error_responses",
761 .data = &init_net.ipv4.sysctl_icmp_ignore_bogus_error_responses,
762 .maxlen = sizeof(int),
763 .mode = 0644,
764 .proc_handler = proc_dointvec
765 },
766 {
767 .procname = "icmp_errors_use_inbound_ifaddr",
768 .data = &init_net.ipv4.sysctl_icmp_errors_use_inbound_ifaddr,
769 .maxlen = sizeof(int),
770 .mode = 0644,
771 .proc_handler = proc_dointvec
772 },
773 {
774 .procname = "icmp_ratelimit",
775 .data = &init_net.ipv4.sysctl_icmp_ratelimit,
776 .maxlen = sizeof(int),
777 .mode = 0644,
778 .proc_handler = proc_dointvec_ms_jiffies,
779 },
780 {
781 .procname = "icmp_ratemask",
782 .data = &init_net.ipv4.sysctl_icmp_ratemask,
783 .maxlen = sizeof(int),
784 .mode = 0644,
785 .proc_handler = proc_dointvec
786 },
787 {
788 .procname = "ping_group_range",
789 .data = &init_net.ipv4.ping_group_range.range,
790 .maxlen = sizeof(gid_t)*2,
791 .mode = 0644,
792 .proc_handler = ipv4_ping_group_range,
793 },
794 {
795 .procname = "tcp_ecn",
796 .data = &init_net.ipv4.sysctl_tcp_ecn,
797 .maxlen = sizeof(int),
798 .mode = 0644,
799 .proc_handler = proc_dointvec
800 },
801 {
802 .procname = "tcp_ecn_fallback",
803 .data = &init_net.ipv4.sysctl_tcp_ecn_fallback,
804 .maxlen = sizeof(int),
805 .mode = 0644,
806 .proc_handler = proc_dointvec
807 },
808 {
809 .procname = "ip_dynaddr",
810 .data = &init_net.ipv4.sysctl_ip_dynaddr,
811 .maxlen = sizeof(int),
812 .mode = 0644,
813 .proc_handler = proc_dointvec
814 },
815 {
816 .procname = "ip_early_demux",
817 .data = &init_net.ipv4.sysctl_ip_early_demux,
818 .maxlen = sizeof(int),
819 .mode = 0644,
820 .proc_handler = proc_dointvec
821 },
822 {
823 .procname = "udp_early_demux",
824 .data = &init_net.ipv4.sysctl_udp_early_demux,
825 .maxlen = sizeof(int),
826 .mode = 0644,
827 .proc_handler = proc_udp_early_demux
828 },
829 {
830 .procname = "tcp_early_demux",
831 .data = &init_net.ipv4.sysctl_tcp_early_demux,
832 .maxlen = sizeof(int),
833 .mode = 0644,
834 .proc_handler = proc_tcp_early_demux
835 },
836 {
837 .procname = "ip_default_ttl",
838 .data = &init_net.ipv4.sysctl_ip_default_ttl,
839 .maxlen = sizeof(int),
840 .mode = 0644,
841 .proc_handler = proc_dointvec_minmax,
842 .extra1 = &ip_ttl_min,
843 .extra2 = &ip_ttl_max,
844 },
845 {
846 .procname = "ip_local_port_range",
847 .maxlen = sizeof(init_net.ipv4.ip_local_ports.range),
848 .data = &init_net.ipv4.ip_local_ports.range,
849 .mode = 0644,
850 .proc_handler = ipv4_local_port_range,
851 },
852 {
853 .procname = "ip_local_reserved_ports",
854 .data = &init_net.ipv4.sysctl_local_reserved_ports,
855 .maxlen = 65536,
856 .mode = 0644,
857 .proc_handler = proc_do_large_bitmap,
858 },
859 {
860 .procname = "ip_no_pmtu_disc",
861 .data = &init_net.ipv4.sysctl_ip_no_pmtu_disc,
862 .maxlen = sizeof(int),
863 .mode = 0644,
864 .proc_handler = proc_dointvec
865 },
866 {
867 .procname = "ip_forward_use_pmtu",
868 .data = &init_net.ipv4.sysctl_ip_fwd_use_pmtu,
869 .maxlen = sizeof(int),
870 .mode = 0644,
871 .proc_handler = proc_dointvec,
872 },
873 {
874 .procname = "ip_nonlocal_bind",
875 .data = &init_net.ipv4.sysctl_ip_nonlocal_bind,
876 .maxlen = sizeof(int),
877 .mode = 0644,
878 .proc_handler = proc_dointvec
879 },
880 {
881 .procname = "fwmark_reflect",
882 .data = &init_net.ipv4.sysctl_fwmark_reflect,
883 .maxlen = sizeof(int),
884 .mode = 0644,
885 .proc_handler = proc_dointvec,
886 },
887 {
888 .procname = "tcp_fwmark_accept",
889 .data = &init_net.ipv4.sysctl_tcp_fwmark_accept,
890 .maxlen = sizeof(int),
891 .mode = 0644,
892 .proc_handler = proc_dointvec,
893 },
894 #ifdef CONFIG_NET_L3_MASTER_DEV
895 {
896 .procname = "tcp_l3mdev_accept",
897 .data = &init_net.ipv4.sysctl_tcp_l3mdev_accept,
898 .maxlen = sizeof(int),
899 .mode = 0644,
900 .proc_handler = proc_dointvec_minmax,
901 .extra1 = &zero,
902 .extra2 = &one,
903 },
904 #endif
905 {
906 .procname = "tcp_mtu_probing",
907 .data = &init_net.ipv4.sysctl_tcp_mtu_probing,
908 .maxlen = sizeof(int),
909 .mode = 0644,
910 .proc_handler = proc_dointvec,
911 },
912 {
913 .procname = "tcp_base_mss",
914 .data = &init_net.ipv4.sysctl_tcp_base_mss,
915 .maxlen = sizeof(int),
916 .mode = 0644,
917 .proc_handler = proc_dointvec,
918 },
919 {
920 .procname = "tcp_probe_threshold",
921 .data = &init_net.ipv4.sysctl_tcp_probe_threshold,
922 .maxlen = sizeof(int),
923 .mode = 0644,
924 .proc_handler = proc_dointvec,
925 },
926 {
927 .procname = "tcp_probe_interval",
928 .data = &init_net.ipv4.sysctl_tcp_probe_interval,
929 .maxlen = sizeof(int),
930 .mode = 0644,
931 .proc_handler = proc_dointvec,
932 },
933 {
934 .procname = "igmp_link_local_mcast_reports",
935 .data = &init_net.ipv4.sysctl_igmp_llm_reports,
936 .maxlen = sizeof(int),
937 .mode = 0644,
938 .proc_handler = proc_dointvec
939 },
940 {
941 .procname = "igmp_max_memberships",
942 .data = &init_net.ipv4.sysctl_igmp_max_memberships,
943 .maxlen = sizeof(int),
944 .mode = 0644,
945 .proc_handler = proc_dointvec
946 },
947 {
948 .procname = "igmp_max_msf",
949 .data = &init_net.ipv4.sysctl_igmp_max_msf,
950 .maxlen = sizeof(int),
951 .mode = 0644,
952 .proc_handler = proc_dointvec
953 },
954 #ifdef CONFIG_IP_MULTICAST
955 {
956 .procname = "igmp_qrv",
957 .data = &init_net.ipv4.sysctl_igmp_qrv,
958 .maxlen = sizeof(int),
959 .mode = 0644,
960 .proc_handler = proc_dointvec_minmax,
961 .extra1 = &one
962 },
963 #endif
964 {
965 .procname = "tcp_keepalive_time",
966 .data = &init_net.ipv4.sysctl_tcp_keepalive_time,
967 .maxlen = sizeof(int),
968 .mode = 0644,
969 .proc_handler = proc_dointvec_jiffies,
970 },
971 {
972 .procname = "tcp_keepalive_probes",
973 .data = &init_net.ipv4.sysctl_tcp_keepalive_probes,
974 .maxlen = sizeof(int),
975 .mode = 0644,
976 .proc_handler = proc_dointvec
977 },
978 {
979 .procname = "tcp_keepalive_intvl",
980 .data = &init_net.ipv4.sysctl_tcp_keepalive_intvl,
981 .maxlen = sizeof(int),
982 .mode = 0644,
983 .proc_handler = proc_dointvec_jiffies,
984 },
985 {
986 .procname = "tcp_syn_retries",
987 .data = &init_net.ipv4.sysctl_tcp_syn_retries,
988 .maxlen = sizeof(int),
989 .mode = 0644,
990 .proc_handler = proc_dointvec_minmax,
991 .extra1 = &tcp_syn_retries_min,
992 .extra2 = &tcp_syn_retries_max
993 },
994 {
995 .procname = "tcp_synack_retries",
996 .data = &init_net.ipv4.sysctl_tcp_synack_retries,
997 .maxlen = sizeof(int),
998 .mode = 0644,
999 .proc_handler = proc_dointvec
1000 },
1001 #ifdef CONFIG_SYN_COOKIES
1002 {
1003 .procname = "tcp_syncookies",
1004 .data = &init_net.ipv4.sysctl_tcp_syncookies,
1005 .maxlen = sizeof(int),
1006 .mode = 0644,
1007 .proc_handler = proc_dointvec
1008 },
1009 #endif
1010 {
1011 .procname = "tcp_reordering",
1012 .data = &init_net.ipv4.sysctl_tcp_reordering,
1013 .maxlen = sizeof(int),
1014 .mode = 0644,
1015 .proc_handler = proc_dointvec
1016 },
1017 {
1018 .procname = "tcp_retries1",
1019 .data = &init_net.ipv4.sysctl_tcp_retries1,
1020 .maxlen = sizeof(int),
1021 .mode = 0644,
1022 .proc_handler = proc_dointvec_minmax,
1023 .extra2 = &tcp_retr1_max
1024 },
1025 {
1026 .procname = "tcp_retries2",
1027 .data = &init_net.ipv4.sysctl_tcp_retries2,
1028 .maxlen = sizeof(int),
1029 .mode = 0644,
1030 .proc_handler = proc_dointvec
1031 },
1032 {
1033 .procname = "tcp_orphan_retries",
1034 .data = &init_net.ipv4.sysctl_tcp_orphan_retries,
1035 .maxlen = sizeof(int),
1036 .mode = 0644,
1037 .proc_handler = proc_dointvec
1038 },
1039 {
1040 .procname = "tcp_fin_timeout",
1041 .data = &init_net.ipv4.sysctl_tcp_fin_timeout,
1042 .maxlen = sizeof(int),
1043 .mode = 0644,
1044 .proc_handler = proc_dointvec_jiffies,
1045 },
1046 {
1047 .procname = "tcp_notsent_lowat",
1048 .data = &init_net.ipv4.sysctl_tcp_notsent_lowat,
1049 .maxlen = sizeof(unsigned int),
1050 .mode = 0644,
1051 .proc_handler = proc_douintvec,
1052 },
1053 {
1054 .procname = "tcp_tw_reuse",
1055 .data = &init_net.ipv4.sysctl_tcp_tw_reuse,
1056 .maxlen = sizeof(int),
1057 .mode = 0644,
1058 .proc_handler = proc_dointvec
1059 },
1060 {
1061 .procname = "tcp_max_tw_buckets",
1062 .data = &init_net.ipv4.tcp_death_row.sysctl_max_tw_buckets,
1063 .maxlen = sizeof(int),
1064 .mode = 0644,
1065 .proc_handler = proc_dointvec
1066 },
1067 {
1068 .procname = "tcp_max_syn_backlog",
1069 .data = &init_net.ipv4.sysctl_max_syn_backlog,
1070 .maxlen = sizeof(int),
1071 .mode = 0644,
1072 .proc_handler = proc_dointvec
1073 },
1074 #ifdef CONFIG_IP_ROUTE_MULTIPATH
1075 {
1076 .procname = "fib_multipath_use_neigh",
1077 .data = &init_net.ipv4.sysctl_fib_multipath_use_neigh,
1078 .maxlen = sizeof(int),
1079 .mode = 0644,
1080 .proc_handler = proc_dointvec_minmax,
1081 .extra1 = &zero,
1082 .extra2 = &one,
1083 },
1084 {
1085 .procname = "fib_multipath_hash_policy",
1086 .data = &init_net.ipv4.sysctl_fib_multipath_hash_policy,
1087 .maxlen = sizeof(int),
1088 .mode = 0644,
1089 .proc_handler = proc_dointvec_minmax,
1090 .extra1 = &zero,
1091 .extra2 = &one,
1092 },
1093 #endif
1094 {
1095 .procname = "ip_unprivileged_port_start",
1096 .maxlen = sizeof(int),
1097 .data = &init_net.ipv4.sysctl_ip_prot_sock,
1098 .mode = 0644,
1099 .proc_handler = ipv4_privileged_ports,
1100 },
1101 #ifdef CONFIG_NET_L3_MASTER_DEV
1102 {
1103 .procname = "udp_l3mdev_accept",
1104 .data = &init_net.ipv4.sysctl_udp_l3mdev_accept,
1105 .maxlen = sizeof(int),
1106 .mode = 0644,
1107 .proc_handler = proc_dointvec_minmax,
1108 .extra1 = &zero,
1109 .extra2 = &one,
1110 },
1111 #endif
1112 {
1113 .procname = "tcp_sack",
1114 .data = &init_net.ipv4.sysctl_tcp_sack,
1115 .maxlen = sizeof(int),
1116 .mode = 0644,
1117 .proc_handler = proc_dointvec
1118 },
1119 { }
1120 };
1121
1122 static __net_init int ipv4_sysctl_init_net(struct net *net)
1123 {
1124 struct ctl_table *table;
1125
1126 table = ipv4_net_table;
1127 if (!net_eq(net, &init_net)) {
1128 int i;
1129
1130 table = kmemdup(table, sizeof(ipv4_net_table), GFP_KERNEL);
1131 if (!table)
1132 goto err_alloc;
1133
1134 /* Update the variables to point into the current struct net */
1135 for (i = 0; i < ARRAY_SIZE(ipv4_net_table) - 1; i++)
1136 table[i].data += (void *)net - (void *)&init_net;
1137 }
1138
1139 net->ipv4.ipv4_hdr = register_net_sysctl(net, "net/ipv4", table);
1140 if (!net->ipv4.ipv4_hdr)
1141 goto err_reg;
1142
1143 net->ipv4.sysctl_local_reserved_ports = kzalloc(65536 / 8, GFP_KERNEL);
1144 if (!net->ipv4.sysctl_local_reserved_ports)
1145 goto err_ports;
1146
1147 return 0;
1148
1149 err_ports:
1150 unregister_net_sysctl_table(net->ipv4.ipv4_hdr);
1151 err_reg:
1152 if (!net_eq(net, &init_net))
1153 kfree(table);
1154 err_alloc:
1155 return -ENOMEM;
1156 }
1157
1158 static __net_exit void ipv4_sysctl_exit_net(struct net *net)
1159 {
1160 struct ctl_table *table;
1161
1162 kfree(net->ipv4.sysctl_local_reserved_ports);
1163 table = net->ipv4.ipv4_hdr->ctl_table_arg;
1164 unregister_net_sysctl_table(net->ipv4.ipv4_hdr);
1165 kfree(table);
1166 }
1167
1168 static __net_initdata struct pernet_operations ipv4_sysctl_ops = {
1169 .init = ipv4_sysctl_init_net,
1170 .exit = ipv4_sysctl_exit_net,
1171 };
1172
1173 static __init int sysctl_ipv4_init(void)
1174 {
1175 struct ctl_table_header *hdr;
1176
1177 hdr = register_net_sysctl(&init_net, "net/ipv4", ipv4_table);
1178 if (!hdr)
1179 return -ENOMEM;
1180
1181 if (register_pernet_subsys(&ipv4_sysctl_ops)) {
1182 unregister_net_sysctl_table(hdr);
1183 return -ENOMEM;
1184 }
1185
1186 return 0;
1187 }
1188
1189 __initcall(sysctl_ipv4_init);
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