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icmp: add a global rate limitation
[GitHub/LineageOS/android_kernel_motorola_exynos9610.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/tcp_memcontrol.h>
28
29 static int zero;
30 static int one = 1;
31 static int four = 4;
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 write_seqlock(&net->ipv4.ip_local_ports.lock);
49 net->ipv4.ip_local_ports.range[0] = range[0];
50 net->ipv4.ip_local_ports.range[1] = range[1];
51 write_sequnlock(&net->ipv4.ip_local_ports.lock);
52 }
53
54 /* Validate changes from /proc interface. */
55 static int ipv4_local_port_range(struct ctl_table *table, int write,
56 void __user *buffer,
57 size_t *lenp, loff_t *ppos)
58 {
59 struct net *net =
60 container_of(table->data, struct net, ipv4.ip_local_ports.range);
61 int ret;
62 int range[2];
63 struct ctl_table tmp = {
64 .data = &range,
65 .maxlen = sizeof(range),
66 .mode = table->mode,
67 .extra1 = &ip_local_port_range_min,
68 .extra2 = &ip_local_port_range_max,
69 };
70
71 inet_get_local_port_range(net, &range[0], &range[1]);
72
73 ret = proc_dointvec_minmax(&tmp, write, buffer, lenp, ppos);
74
75 if (write && ret == 0) {
76 if (range[1] < range[0])
77 ret = -EINVAL;
78 else
79 set_local_port_range(net, range);
80 }
81
82 return ret;
83 }
84
85
86 static void inet_get_ping_group_range_table(struct ctl_table *table, kgid_t *low, kgid_t *high)
87 {
88 kgid_t *data = table->data;
89 struct net *net =
90 container_of(table->data, struct net, ipv4.ping_group_range.range);
91 unsigned int seq;
92 do {
93 seq = read_seqbegin(&net->ipv4.ip_local_ports.lock);
94
95 *low = data[0];
96 *high = data[1];
97 } while (read_seqretry(&net->ipv4.ip_local_ports.lock, seq));
98 }
99
100 /* Update system visible IP port range */
101 static void set_ping_group_range(struct ctl_table *table, kgid_t low, kgid_t high)
102 {
103 kgid_t *data = table->data;
104 struct net *net =
105 container_of(table->data, struct net, ipv4.ping_group_range.range);
106 write_seqlock(&net->ipv4.ip_local_ports.lock);
107 data[0] = low;
108 data[1] = high;
109 write_sequnlock(&net->ipv4.ip_local_ports.lock);
110 }
111
112 /* Validate changes from /proc interface. */
113 static int ipv4_ping_group_range(struct ctl_table *table, int write,
114 void __user *buffer,
115 size_t *lenp, loff_t *ppos)
116 {
117 struct user_namespace *user_ns = current_user_ns();
118 int ret;
119 gid_t urange[2];
120 kgid_t low, high;
121 struct ctl_table tmp = {
122 .data = &urange,
123 .maxlen = sizeof(urange),
124 .mode = table->mode,
125 .extra1 = &ip_ping_group_range_min,
126 .extra2 = &ip_ping_group_range_max,
127 };
128
129 inet_get_ping_group_range_table(table, &low, &high);
130 urange[0] = from_kgid_munged(user_ns, low);
131 urange[1] = from_kgid_munged(user_ns, high);
132 ret = proc_dointvec_minmax(&tmp, write, buffer, lenp, ppos);
133
134 if (write && ret == 0) {
135 low = make_kgid(user_ns, urange[0]);
136 high = make_kgid(user_ns, urange[1]);
137 if (!gid_valid(low) || !gid_valid(high) ||
138 (urange[1] < urange[0]) || gid_lt(high, low)) {
139 low = make_kgid(&init_user_ns, 1);
140 high = make_kgid(&init_user_ns, 0);
141 }
142 set_ping_group_range(table, low, high);
143 }
144
145 return ret;
146 }
147
148 static int proc_tcp_congestion_control(struct ctl_table *ctl, int write,
149 void __user *buffer, size_t *lenp, loff_t *ppos)
150 {
151 char val[TCP_CA_NAME_MAX];
152 struct ctl_table tbl = {
153 .data = val,
154 .maxlen = TCP_CA_NAME_MAX,
155 };
156 int ret;
157
158 tcp_get_default_congestion_control(val);
159
160 ret = proc_dostring(&tbl, write, buffer, lenp, ppos);
161 if (write && ret == 0)
162 ret = tcp_set_default_congestion_control(val);
163 return ret;
164 }
165
166 static int proc_tcp_available_congestion_control(struct ctl_table *ctl,
167 int write,
168 void __user *buffer, size_t *lenp,
169 loff_t *ppos)
170 {
171 struct ctl_table tbl = { .maxlen = TCP_CA_BUF_MAX, };
172 int ret;
173
174 tbl.data = kmalloc(tbl.maxlen, GFP_USER);
175 if (!tbl.data)
176 return -ENOMEM;
177 tcp_get_available_congestion_control(tbl.data, TCP_CA_BUF_MAX);
178 ret = proc_dostring(&tbl, write, buffer, lenp, ppos);
179 kfree(tbl.data);
180 return ret;
181 }
182
183 static int proc_allowed_congestion_control(struct ctl_table *ctl,
184 int write,
185 void __user *buffer, size_t *lenp,
186 loff_t *ppos)
187 {
188 struct ctl_table tbl = { .maxlen = TCP_CA_BUF_MAX };
189 int ret;
190
191 tbl.data = kmalloc(tbl.maxlen, GFP_USER);
192 if (!tbl.data)
193 return -ENOMEM;
194
195 tcp_get_allowed_congestion_control(tbl.data, tbl.maxlen);
196 ret = proc_dostring(&tbl, write, buffer, lenp, ppos);
197 if (write && ret == 0)
198 ret = tcp_set_allowed_congestion_control(tbl.data);
199 kfree(tbl.data);
200 return ret;
201 }
202
203 static int proc_tcp_fastopen_key(struct ctl_table *ctl, int write,
204 void __user *buffer, size_t *lenp,
205 loff_t *ppos)
206 {
207 struct ctl_table tbl = { .maxlen = (TCP_FASTOPEN_KEY_LENGTH * 2 + 10) };
208 struct tcp_fastopen_context *ctxt;
209 int ret;
210 u32 user_key[4]; /* 16 bytes, matching TCP_FASTOPEN_KEY_LENGTH */
211
212 tbl.data = kmalloc(tbl.maxlen, GFP_KERNEL);
213 if (!tbl.data)
214 return -ENOMEM;
215
216 rcu_read_lock();
217 ctxt = rcu_dereference(tcp_fastopen_ctx);
218 if (ctxt)
219 memcpy(user_key, ctxt->key, TCP_FASTOPEN_KEY_LENGTH);
220 else
221 memset(user_key, 0, sizeof(user_key));
222 rcu_read_unlock();
223
224 snprintf(tbl.data, tbl.maxlen, "%08x-%08x-%08x-%08x",
225 user_key[0], user_key[1], user_key[2], user_key[3]);
226 ret = proc_dostring(&tbl, write, buffer, lenp, ppos);
227
228 if (write && ret == 0) {
229 if (sscanf(tbl.data, "%x-%x-%x-%x", user_key, user_key + 1,
230 user_key + 2, user_key + 3) != 4) {
231 ret = -EINVAL;
232 goto bad_key;
233 }
234 /* Generate a dummy secret but don't publish it. This
235 * is needed so we don't regenerate a new key on the
236 * first invocation of tcp_fastopen_cookie_gen
237 */
238 tcp_fastopen_init_key_once(false);
239 tcp_fastopen_reset_cipher(user_key, TCP_FASTOPEN_KEY_LENGTH);
240 }
241
242 bad_key:
243 pr_debug("proc FO key set 0x%x-%x-%x-%x <- 0x%s: %u\n",
244 user_key[0], user_key[1], user_key[2], user_key[3],
245 (char *)tbl.data, ret);
246 kfree(tbl.data);
247 return ret;
248 }
249
250 static struct ctl_table ipv4_table[] = {
251 {
252 .procname = "tcp_timestamps",
253 .data = &sysctl_tcp_timestamps,
254 .maxlen = sizeof(int),
255 .mode = 0644,
256 .proc_handler = proc_dointvec
257 },
258 {
259 .procname = "tcp_window_scaling",
260 .data = &sysctl_tcp_window_scaling,
261 .maxlen = sizeof(int),
262 .mode = 0644,
263 .proc_handler = proc_dointvec
264 },
265 {
266 .procname = "tcp_sack",
267 .data = &sysctl_tcp_sack,
268 .maxlen = sizeof(int),
269 .mode = 0644,
270 .proc_handler = proc_dointvec
271 },
272 {
273 .procname = "tcp_retrans_collapse",
274 .data = &sysctl_tcp_retrans_collapse,
275 .maxlen = sizeof(int),
276 .mode = 0644,
277 .proc_handler = proc_dointvec
278 },
279 {
280 .procname = "ip_default_ttl",
281 .data = &sysctl_ip_default_ttl,
282 .maxlen = sizeof(int),
283 .mode = 0644,
284 .proc_handler = proc_dointvec_minmax,
285 .extra1 = &ip_ttl_min,
286 .extra2 = &ip_ttl_max,
287 },
288 {
289 .procname = "tcp_syn_retries",
290 .data = &sysctl_tcp_syn_retries,
291 .maxlen = sizeof(int),
292 .mode = 0644,
293 .proc_handler = proc_dointvec_minmax,
294 .extra1 = &tcp_syn_retries_min,
295 .extra2 = &tcp_syn_retries_max
296 },
297 {
298 .procname = "tcp_synack_retries",
299 .data = &sysctl_tcp_synack_retries,
300 .maxlen = sizeof(int),
301 .mode = 0644,
302 .proc_handler = proc_dointvec
303 },
304 {
305 .procname = "tcp_max_orphans",
306 .data = &sysctl_tcp_max_orphans,
307 .maxlen = sizeof(int),
308 .mode = 0644,
309 .proc_handler = proc_dointvec
310 },
311 {
312 .procname = "tcp_max_tw_buckets",
313 .data = &tcp_death_row.sysctl_max_tw_buckets,
314 .maxlen = sizeof(int),
315 .mode = 0644,
316 .proc_handler = proc_dointvec
317 },
318 {
319 .procname = "ip_early_demux",
320 .data = &sysctl_ip_early_demux,
321 .maxlen = sizeof(int),
322 .mode = 0644,
323 .proc_handler = proc_dointvec
324 },
325 {
326 .procname = "ip_dynaddr",
327 .data = &sysctl_ip_dynaddr,
328 .maxlen = sizeof(int),
329 .mode = 0644,
330 .proc_handler = proc_dointvec
331 },
332 {
333 .procname = "tcp_keepalive_time",
334 .data = &sysctl_tcp_keepalive_time,
335 .maxlen = sizeof(int),
336 .mode = 0644,
337 .proc_handler = proc_dointvec_jiffies,
338 },
339 {
340 .procname = "tcp_keepalive_probes",
341 .data = &sysctl_tcp_keepalive_probes,
342 .maxlen = sizeof(int),
343 .mode = 0644,
344 .proc_handler = proc_dointvec
345 },
346 {
347 .procname = "tcp_keepalive_intvl",
348 .data = &sysctl_tcp_keepalive_intvl,
349 .maxlen = sizeof(int),
350 .mode = 0644,
351 .proc_handler = proc_dointvec_jiffies,
352 },
353 {
354 .procname = "tcp_retries1",
355 .data = &sysctl_tcp_retries1,
356 .maxlen = sizeof(int),
357 .mode = 0644,
358 .proc_handler = proc_dointvec_minmax,
359 .extra2 = &tcp_retr1_max
360 },
361 {
362 .procname = "tcp_retries2",
363 .data = &sysctl_tcp_retries2,
364 .maxlen = sizeof(int),
365 .mode = 0644,
366 .proc_handler = proc_dointvec
367 },
368 {
369 .procname = "tcp_fin_timeout",
370 .data = &sysctl_tcp_fin_timeout,
371 .maxlen = sizeof(int),
372 .mode = 0644,
373 .proc_handler = proc_dointvec_jiffies,
374 },
375 #ifdef CONFIG_SYN_COOKIES
376 {
377 .procname = "tcp_syncookies",
378 .data = &sysctl_tcp_syncookies,
379 .maxlen = sizeof(int),
380 .mode = 0644,
381 .proc_handler = proc_dointvec
382 },
383 #endif
384 {
385 .procname = "tcp_fastopen",
386 .data = &sysctl_tcp_fastopen,
387 .maxlen = sizeof(int),
388 .mode = 0644,
389 .proc_handler = proc_dointvec,
390 },
391 {
392 .procname = "tcp_fastopen_key",
393 .mode = 0600,
394 .maxlen = ((TCP_FASTOPEN_KEY_LENGTH * 2) + 10),
395 .proc_handler = proc_tcp_fastopen_key,
396 },
397 {
398 .procname = "tcp_tw_recycle",
399 .data = &tcp_death_row.sysctl_tw_recycle,
400 .maxlen = sizeof(int),
401 .mode = 0644,
402 .proc_handler = proc_dointvec
403 },
404 {
405 .procname = "tcp_abort_on_overflow",
406 .data = &sysctl_tcp_abort_on_overflow,
407 .maxlen = sizeof(int),
408 .mode = 0644,
409 .proc_handler = proc_dointvec
410 },
411 {
412 .procname = "tcp_stdurg",
413 .data = &sysctl_tcp_stdurg,
414 .maxlen = sizeof(int),
415 .mode = 0644,
416 .proc_handler = proc_dointvec
417 },
418 {
419 .procname = "tcp_rfc1337",
420 .data = &sysctl_tcp_rfc1337,
421 .maxlen = sizeof(int),
422 .mode = 0644,
423 .proc_handler = proc_dointvec
424 },
425 {
426 .procname = "tcp_max_syn_backlog",
427 .data = &sysctl_max_syn_backlog,
428 .maxlen = sizeof(int),
429 .mode = 0644,
430 .proc_handler = proc_dointvec
431 },
432 {
433 .procname = "igmp_max_memberships",
434 .data = &sysctl_igmp_max_memberships,
435 .maxlen = sizeof(int),
436 .mode = 0644,
437 .proc_handler = proc_dointvec
438 },
439 {
440 .procname = "igmp_max_msf",
441 .data = &sysctl_igmp_max_msf,
442 .maxlen = sizeof(int),
443 .mode = 0644,
444 .proc_handler = proc_dointvec
445 },
446 #ifdef CONFIG_IP_MULTICAST
447 {
448 .procname = "igmp_qrv",
449 .data = &sysctl_igmp_qrv,
450 .maxlen = sizeof(int),
451 .mode = 0644,
452 .proc_handler = proc_dointvec_minmax,
453 .extra1 = &one
454 },
455 #endif
456 {
457 .procname = "inet_peer_threshold",
458 .data = &inet_peer_threshold,
459 .maxlen = sizeof(int),
460 .mode = 0644,
461 .proc_handler = proc_dointvec
462 },
463 {
464 .procname = "inet_peer_minttl",
465 .data = &inet_peer_minttl,
466 .maxlen = sizeof(int),
467 .mode = 0644,
468 .proc_handler = proc_dointvec_jiffies,
469 },
470 {
471 .procname = "inet_peer_maxttl",
472 .data = &inet_peer_maxttl,
473 .maxlen = sizeof(int),
474 .mode = 0644,
475 .proc_handler = proc_dointvec_jiffies,
476 },
477 {
478 .procname = "tcp_orphan_retries",
479 .data = &sysctl_tcp_orphan_retries,
480 .maxlen = sizeof(int),
481 .mode = 0644,
482 .proc_handler = proc_dointvec
483 },
484 {
485 .procname = "tcp_fack",
486 .data = &sysctl_tcp_fack,
487 .maxlen = sizeof(int),
488 .mode = 0644,
489 .proc_handler = proc_dointvec
490 },
491 {
492 .procname = "tcp_reordering",
493 .data = &sysctl_tcp_reordering,
494 .maxlen = sizeof(int),
495 .mode = 0644,
496 .proc_handler = proc_dointvec
497 },
498 {
499 .procname = "tcp_dsack",
500 .data = &sysctl_tcp_dsack,
501 .maxlen = sizeof(int),
502 .mode = 0644,
503 .proc_handler = proc_dointvec
504 },
505 {
506 .procname = "tcp_mem",
507 .maxlen = sizeof(sysctl_tcp_mem),
508 .data = &sysctl_tcp_mem,
509 .mode = 0644,
510 .proc_handler = proc_doulongvec_minmax,
511 },
512 {
513 .procname = "tcp_wmem",
514 .data = &sysctl_tcp_wmem,
515 .maxlen = sizeof(sysctl_tcp_wmem),
516 .mode = 0644,
517 .proc_handler = proc_dointvec_minmax,
518 .extra1 = &one,
519 },
520 {
521 .procname = "tcp_notsent_lowat",
522 .data = &sysctl_tcp_notsent_lowat,
523 .maxlen = sizeof(sysctl_tcp_notsent_lowat),
524 .mode = 0644,
525 .proc_handler = proc_dointvec,
526 },
527 {
528 .procname = "tcp_rmem",
529 .data = &sysctl_tcp_rmem,
530 .maxlen = sizeof(sysctl_tcp_rmem),
531 .mode = 0644,
532 .proc_handler = proc_dointvec_minmax,
533 .extra1 = &one,
534 },
535 {
536 .procname = "tcp_app_win",
537 .data = &sysctl_tcp_app_win,
538 .maxlen = sizeof(int),
539 .mode = 0644,
540 .proc_handler = proc_dointvec
541 },
542 {
543 .procname = "tcp_adv_win_scale",
544 .data = &sysctl_tcp_adv_win_scale,
545 .maxlen = sizeof(int),
546 .mode = 0644,
547 .proc_handler = proc_dointvec_minmax,
548 .extra1 = &tcp_adv_win_scale_min,
549 .extra2 = &tcp_adv_win_scale_max,
550 },
551 {
552 .procname = "tcp_tw_reuse",
553 .data = &sysctl_tcp_tw_reuse,
554 .maxlen = sizeof(int),
555 .mode = 0644,
556 .proc_handler = proc_dointvec
557 },
558 {
559 .procname = "tcp_frto",
560 .data = &sysctl_tcp_frto,
561 .maxlen = sizeof(int),
562 .mode = 0644,
563 .proc_handler = proc_dointvec
564 },
565 {
566 .procname = "tcp_low_latency",
567 .data = &sysctl_tcp_low_latency,
568 .maxlen = sizeof(int),
569 .mode = 0644,
570 .proc_handler = proc_dointvec
571 },
572 {
573 .procname = "tcp_no_metrics_save",
574 .data = &sysctl_tcp_nometrics_save,
575 .maxlen = sizeof(int),
576 .mode = 0644,
577 .proc_handler = proc_dointvec,
578 },
579 {
580 .procname = "tcp_moderate_rcvbuf",
581 .data = &sysctl_tcp_moderate_rcvbuf,
582 .maxlen = sizeof(int),
583 .mode = 0644,
584 .proc_handler = proc_dointvec,
585 },
586 {
587 .procname = "tcp_tso_win_divisor",
588 .data = &sysctl_tcp_tso_win_divisor,
589 .maxlen = sizeof(int),
590 .mode = 0644,
591 .proc_handler = proc_dointvec,
592 },
593 {
594 .procname = "tcp_congestion_control",
595 .mode = 0644,
596 .maxlen = TCP_CA_NAME_MAX,
597 .proc_handler = proc_tcp_congestion_control,
598 },
599 {
600 .procname = "tcp_mtu_probing",
601 .data = &sysctl_tcp_mtu_probing,
602 .maxlen = sizeof(int),
603 .mode = 0644,
604 .proc_handler = proc_dointvec,
605 },
606 {
607 .procname = "tcp_base_mss",
608 .data = &sysctl_tcp_base_mss,
609 .maxlen = sizeof(int),
610 .mode = 0644,
611 .proc_handler = proc_dointvec,
612 },
613 {
614 .procname = "tcp_workaround_signed_windows",
615 .data = &sysctl_tcp_workaround_signed_windows,
616 .maxlen = sizeof(int),
617 .mode = 0644,
618 .proc_handler = proc_dointvec
619 },
620 {
621 .procname = "tcp_limit_output_bytes",
622 .data = &sysctl_tcp_limit_output_bytes,
623 .maxlen = sizeof(int),
624 .mode = 0644,
625 .proc_handler = proc_dointvec
626 },
627 {
628 .procname = "tcp_challenge_ack_limit",
629 .data = &sysctl_tcp_challenge_ack_limit,
630 .maxlen = sizeof(int),
631 .mode = 0644,
632 .proc_handler = proc_dointvec
633 },
634 #ifdef CONFIG_NET_DMA
635 {
636 .procname = "tcp_dma_copybreak",
637 .data = &sysctl_tcp_dma_copybreak,
638 .maxlen = sizeof(int),
639 .mode = 0644,
640 .proc_handler = proc_dointvec
641 },
642 #endif
643 {
644 .procname = "tcp_slow_start_after_idle",
645 .data = &sysctl_tcp_slow_start_after_idle,
646 .maxlen = sizeof(int),
647 .mode = 0644,
648 .proc_handler = proc_dointvec
649 },
650 #ifdef CONFIG_NETLABEL
651 {
652 .procname = "cipso_cache_enable",
653 .data = &cipso_v4_cache_enabled,
654 .maxlen = sizeof(int),
655 .mode = 0644,
656 .proc_handler = proc_dointvec,
657 },
658 {
659 .procname = "cipso_cache_bucket_size",
660 .data = &cipso_v4_cache_bucketsize,
661 .maxlen = sizeof(int),
662 .mode = 0644,
663 .proc_handler = proc_dointvec,
664 },
665 {
666 .procname = "cipso_rbm_optfmt",
667 .data = &cipso_v4_rbm_optfmt,
668 .maxlen = sizeof(int),
669 .mode = 0644,
670 .proc_handler = proc_dointvec,
671 },
672 {
673 .procname = "cipso_rbm_strictvalid",
674 .data = &cipso_v4_rbm_strictvalid,
675 .maxlen = sizeof(int),
676 .mode = 0644,
677 .proc_handler = proc_dointvec,
678 },
679 #endif /* CONFIG_NETLABEL */
680 {
681 .procname = "tcp_available_congestion_control",
682 .maxlen = TCP_CA_BUF_MAX,
683 .mode = 0444,
684 .proc_handler = proc_tcp_available_congestion_control,
685 },
686 {
687 .procname = "tcp_allowed_congestion_control",
688 .maxlen = TCP_CA_BUF_MAX,
689 .mode = 0644,
690 .proc_handler = proc_allowed_congestion_control,
691 },
692 {
693 .procname = "tcp_thin_linear_timeouts",
694 .data = &sysctl_tcp_thin_linear_timeouts,
695 .maxlen = sizeof(int),
696 .mode = 0644,
697 .proc_handler = proc_dointvec
698 },
699 {
700 .procname = "tcp_thin_dupack",
701 .data = &sysctl_tcp_thin_dupack,
702 .maxlen = sizeof(int),
703 .mode = 0644,
704 .proc_handler = proc_dointvec
705 },
706 {
707 .procname = "tcp_early_retrans",
708 .data = &sysctl_tcp_early_retrans,
709 .maxlen = sizeof(int),
710 .mode = 0644,
711 .proc_handler = proc_dointvec_minmax,
712 .extra1 = &zero,
713 .extra2 = &four,
714 },
715 {
716 .procname = "tcp_min_tso_segs",
717 .data = &sysctl_tcp_min_tso_segs,
718 .maxlen = sizeof(int),
719 .mode = 0644,
720 .proc_handler = proc_dointvec_minmax,
721 .extra1 = &zero,
722 .extra2 = &gso_max_segs,
723 },
724 {
725 .procname = "tcp_autocorking",
726 .data = &sysctl_tcp_autocorking,
727 .maxlen = sizeof(int),
728 .mode = 0644,
729 .proc_handler = proc_dointvec_minmax,
730 .extra1 = &zero,
731 .extra2 = &one,
732 },
733 {
734 .procname = "icmp_msgs_per_sec",
735 .data = &sysctl_icmp_msgs_per_sec,
736 .maxlen = sizeof(int),
737 .mode = 0644,
738 .proc_handler = proc_dointvec_minmax,
739 .extra1 = &zero,
740 },
741 {
742 .procname = "icmp_msgs_burst",
743 .data = &sysctl_icmp_msgs_burst,
744 .maxlen = sizeof(int),
745 .mode = 0644,
746 .proc_handler = proc_dointvec_minmax,
747 .extra1 = &zero,
748 },
749 {
750 .procname = "udp_mem",
751 .data = &sysctl_udp_mem,
752 .maxlen = sizeof(sysctl_udp_mem),
753 .mode = 0644,
754 .proc_handler = proc_doulongvec_minmax,
755 },
756 {
757 .procname = "udp_rmem_min",
758 .data = &sysctl_udp_rmem_min,
759 .maxlen = sizeof(sysctl_udp_rmem_min),
760 .mode = 0644,
761 .proc_handler = proc_dointvec_minmax,
762 .extra1 = &one
763 },
764 {
765 .procname = "udp_wmem_min",
766 .data = &sysctl_udp_wmem_min,
767 .maxlen = sizeof(sysctl_udp_wmem_min),
768 .mode = 0644,
769 .proc_handler = proc_dointvec_minmax,
770 .extra1 = &one
771 },
772 { }
773 };
774
775 static struct ctl_table ipv4_net_table[] = {
776 {
777 .procname = "icmp_echo_ignore_all",
778 .data = &init_net.ipv4.sysctl_icmp_echo_ignore_all,
779 .maxlen = sizeof(int),
780 .mode = 0644,
781 .proc_handler = proc_dointvec
782 },
783 {
784 .procname = "icmp_echo_ignore_broadcasts",
785 .data = &init_net.ipv4.sysctl_icmp_echo_ignore_broadcasts,
786 .maxlen = sizeof(int),
787 .mode = 0644,
788 .proc_handler = proc_dointvec
789 },
790 {
791 .procname = "icmp_ignore_bogus_error_responses",
792 .data = &init_net.ipv4.sysctl_icmp_ignore_bogus_error_responses,
793 .maxlen = sizeof(int),
794 .mode = 0644,
795 .proc_handler = proc_dointvec
796 },
797 {
798 .procname = "icmp_errors_use_inbound_ifaddr",
799 .data = &init_net.ipv4.sysctl_icmp_errors_use_inbound_ifaddr,
800 .maxlen = sizeof(int),
801 .mode = 0644,
802 .proc_handler = proc_dointvec
803 },
804 {
805 .procname = "icmp_ratelimit",
806 .data = &init_net.ipv4.sysctl_icmp_ratelimit,
807 .maxlen = sizeof(int),
808 .mode = 0644,
809 .proc_handler = proc_dointvec_ms_jiffies,
810 },
811 {
812 .procname = "icmp_ratemask",
813 .data = &init_net.ipv4.sysctl_icmp_ratemask,
814 .maxlen = sizeof(int),
815 .mode = 0644,
816 .proc_handler = proc_dointvec
817 },
818 {
819 .procname = "ping_group_range",
820 .data = &init_net.ipv4.ping_group_range.range,
821 .maxlen = sizeof(gid_t)*2,
822 .mode = 0644,
823 .proc_handler = ipv4_ping_group_range,
824 },
825 {
826 .procname = "tcp_ecn",
827 .data = &init_net.ipv4.sysctl_tcp_ecn,
828 .maxlen = sizeof(int),
829 .mode = 0644,
830 .proc_handler = proc_dointvec
831 },
832 {
833 .procname = "ip_local_port_range",
834 .maxlen = sizeof(init_net.ipv4.ip_local_ports.range),
835 .data = &init_net.ipv4.ip_local_ports.range,
836 .mode = 0644,
837 .proc_handler = ipv4_local_port_range,
838 },
839 {
840 .procname = "ip_local_reserved_ports",
841 .data = &init_net.ipv4.sysctl_local_reserved_ports,
842 .maxlen = 65536,
843 .mode = 0644,
844 .proc_handler = proc_do_large_bitmap,
845 },
846 {
847 .procname = "ip_no_pmtu_disc",
848 .data = &init_net.ipv4.sysctl_ip_no_pmtu_disc,
849 .maxlen = sizeof(int),
850 .mode = 0644,
851 .proc_handler = proc_dointvec
852 },
853 {
854 .procname = "ip_forward_use_pmtu",
855 .data = &init_net.ipv4.sysctl_ip_fwd_use_pmtu,
856 .maxlen = sizeof(int),
857 .mode = 0644,
858 .proc_handler = proc_dointvec,
859 },
860 {
861 .procname = "ip_nonlocal_bind",
862 .data = &init_net.ipv4.sysctl_ip_nonlocal_bind,
863 .maxlen = sizeof(int),
864 .mode = 0644,
865 .proc_handler = proc_dointvec
866 },
867 {
868 .procname = "fwmark_reflect",
869 .data = &init_net.ipv4.sysctl_fwmark_reflect,
870 .maxlen = sizeof(int),
871 .mode = 0644,
872 .proc_handler = proc_dointvec,
873 },
874 {
875 .procname = "tcp_fwmark_accept",
876 .data = &init_net.ipv4.sysctl_tcp_fwmark_accept,
877 .maxlen = sizeof(int),
878 .mode = 0644,
879 .proc_handler = proc_dointvec,
880 },
881 { }
882 };
883
884 static __net_init int ipv4_sysctl_init_net(struct net *net)
885 {
886 struct ctl_table *table;
887
888 table = ipv4_net_table;
889 if (!net_eq(net, &init_net)) {
890 int i;
891
892 table = kmemdup(table, sizeof(ipv4_net_table), GFP_KERNEL);
893 if (table == NULL)
894 goto err_alloc;
895
896 /* Update the variables to point into the current struct net */
897 for (i = 0; i < ARRAY_SIZE(ipv4_net_table) - 1; i++)
898 table[i].data += (void *)net - (void *)&init_net;
899 }
900
901 net->ipv4.ipv4_hdr = register_net_sysctl(net, "net/ipv4", table);
902 if (net->ipv4.ipv4_hdr == NULL)
903 goto err_reg;
904
905 net->ipv4.sysctl_local_reserved_ports = kzalloc(65536 / 8, GFP_KERNEL);
906 if (!net->ipv4.sysctl_local_reserved_ports)
907 goto err_ports;
908
909 return 0;
910
911 err_ports:
912 unregister_net_sysctl_table(net->ipv4.ipv4_hdr);
913 err_reg:
914 if (!net_eq(net, &init_net))
915 kfree(table);
916 err_alloc:
917 return -ENOMEM;
918 }
919
920 static __net_exit void ipv4_sysctl_exit_net(struct net *net)
921 {
922 struct ctl_table *table;
923
924 kfree(net->ipv4.sysctl_local_reserved_ports);
925 table = net->ipv4.ipv4_hdr->ctl_table_arg;
926 unregister_net_sysctl_table(net->ipv4.ipv4_hdr);
927 kfree(table);
928 }
929
930 static __net_initdata struct pernet_operations ipv4_sysctl_ops = {
931 .init = ipv4_sysctl_init_net,
932 .exit = ipv4_sysctl_exit_net,
933 };
934
935 static __init int sysctl_ipv4_init(void)
936 {
937 struct ctl_table_header *hdr;
938
939 hdr = register_net_sysctl(&init_net, "net/ipv4", ipv4_table);
940 if (hdr == NULL)
941 return -ENOMEM;
942
943 if (register_pernet_subsys(&ipv4_sysctl_ops)) {
944 unregister_net_sysctl_table(hdr);
945 return -ENOMEM;
946 }
947
948 return 0;
949 }
950
951 __initcall(sysctl_ipv4_init);