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Merge remote-tracking branch 'spi/fix/rspi' into spi-rcar
[deliverable/linux.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.sysctl_local_ports.lock);
49 net->ipv4.sysctl_local_ports.range[0] = range[0];
50 net->ipv4.sysctl_local_ports.range[1] = range[1];
51 write_sequnlock(&net->ipv4.sysctl_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.sysctl_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.sysctl_ping_group_range);
91 unsigned int seq;
92 do {
93 seq = read_seqbegin(&net->ipv4.sysctl_local_ports.lock);
94
95 *low = data[0];
96 *high = data[1];
97 } while (read_seqretry(&net->ipv4.sysctl_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.sysctl_ping_group_range);
106 write_seqlock(&net->ipv4.sysctl_local_ports.lock);
107 data[0] = low;
108 data[1] = high;
109 write_sequnlock(&net->ipv4.sysctl_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 = "ip_no_pmtu_disc",
290 .data = &ipv4_config.no_pmtu_disc,
291 .maxlen = sizeof(int),
292 .mode = 0644,
293 .proc_handler = proc_dointvec
294 },
295 {
296 .procname = "ip_nonlocal_bind",
297 .data = &sysctl_ip_nonlocal_bind,
298 .maxlen = sizeof(int),
299 .mode = 0644,
300 .proc_handler = proc_dointvec
301 },
302 {
303 .procname = "tcp_syn_retries",
304 .data = &sysctl_tcp_syn_retries,
305 .maxlen = sizeof(int),
306 .mode = 0644,
307 .proc_handler = proc_dointvec_minmax,
308 .extra1 = &tcp_syn_retries_min,
309 .extra2 = &tcp_syn_retries_max
310 },
311 {
312 .procname = "tcp_synack_retries",
313 .data = &sysctl_tcp_synack_retries,
314 .maxlen = sizeof(int),
315 .mode = 0644,
316 .proc_handler = proc_dointvec
317 },
318 {
319 .procname = "tcp_max_orphans",
320 .data = &sysctl_tcp_max_orphans,
321 .maxlen = sizeof(int),
322 .mode = 0644,
323 .proc_handler = proc_dointvec
324 },
325 {
326 .procname = "tcp_max_tw_buckets",
327 .data = &tcp_death_row.sysctl_max_tw_buckets,
328 .maxlen = sizeof(int),
329 .mode = 0644,
330 .proc_handler = proc_dointvec
331 },
332 {
333 .procname = "ip_early_demux",
334 .data = &sysctl_ip_early_demux,
335 .maxlen = sizeof(int),
336 .mode = 0644,
337 .proc_handler = proc_dointvec
338 },
339 {
340 .procname = "ip_dynaddr",
341 .data = &sysctl_ip_dynaddr,
342 .maxlen = sizeof(int),
343 .mode = 0644,
344 .proc_handler = proc_dointvec
345 },
346 {
347 .procname = "tcp_keepalive_time",
348 .data = &sysctl_tcp_keepalive_time,
349 .maxlen = sizeof(int),
350 .mode = 0644,
351 .proc_handler = proc_dointvec_jiffies,
352 },
353 {
354 .procname = "tcp_keepalive_probes",
355 .data = &sysctl_tcp_keepalive_probes,
356 .maxlen = sizeof(int),
357 .mode = 0644,
358 .proc_handler = proc_dointvec
359 },
360 {
361 .procname = "tcp_keepalive_intvl",
362 .data = &sysctl_tcp_keepalive_intvl,
363 .maxlen = sizeof(int),
364 .mode = 0644,
365 .proc_handler = proc_dointvec_jiffies,
366 },
367 {
368 .procname = "tcp_retries1",
369 .data = &sysctl_tcp_retries1,
370 .maxlen = sizeof(int),
371 .mode = 0644,
372 .proc_handler = proc_dointvec_minmax,
373 .extra2 = &tcp_retr1_max
374 },
375 {
376 .procname = "tcp_retries2",
377 .data = &sysctl_tcp_retries2,
378 .maxlen = sizeof(int),
379 .mode = 0644,
380 .proc_handler = proc_dointvec
381 },
382 {
383 .procname = "tcp_fin_timeout",
384 .data = &sysctl_tcp_fin_timeout,
385 .maxlen = sizeof(int),
386 .mode = 0644,
387 .proc_handler = proc_dointvec_jiffies,
388 },
389 #ifdef CONFIG_SYN_COOKIES
390 {
391 .procname = "tcp_syncookies",
392 .data = &sysctl_tcp_syncookies,
393 .maxlen = sizeof(int),
394 .mode = 0644,
395 .proc_handler = proc_dointvec
396 },
397 #endif
398 {
399 .procname = "tcp_fastopen",
400 .data = &sysctl_tcp_fastopen,
401 .maxlen = sizeof(int),
402 .mode = 0644,
403 .proc_handler = proc_dointvec,
404 },
405 {
406 .procname = "tcp_fastopen_key",
407 .mode = 0600,
408 .maxlen = ((TCP_FASTOPEN_KEY_LENGTH * 2) + 10),
409 .proc_handler = proc_tcp_fastopen_key,
410 },
411 {
412 .procname = "tcp_tw_recycle",
413 .data = &tcp_death_row.sysctl_tw_recycle,
414 .maxlen = sizeof(int),
415 .mode = 0644,
416 .proc_handler = proc_dointvec
417 },
418 {
419 .procname = "tcp_abort_on_overflow",
420 .data = &sysctl_tcp_abort_on_overflow,
421 .maxlen = sizeof(int),
422 .mode = 0644,
423 .proc_handler = proc_dointvec
424 },
425 {
426 .procname = "tcp_stdurg",
427 .data = &sysctl_tcp_stdurg,
428 .maxlen = sizeof(int),
429 .mode = 0644,
430 .proc_handler = proc_dointvec
431 },
432 {
433 .procname = "tcp_rfc1337",
434 .data = &sysctl_tcp_rfc1337,
435 .maxlen = sizeof(int),
436 .mode = 0644,
437 .proc_handler = proc_dointvec
438 },
439 {
440 .procname = "tcp_max_syn_backlog",
441 .data = &sysctl_max_syn_backlog,
442 .maxlen = sizeof(int),
443 .mode = 0644,
444 .proc_handler = proc_dointvec
445 },
446 {
447 .procname = "ip_local_reserved_ports",
448 .data = NULL, /* initialized in sysctl_ipv4_init */
449 .maxlen = 65536,
450 .mode = 0644,
451 .proc_handler = proc_do_large_bitmap,
452 },
453 {
454 .procname = "igmp_max_memberships",
455 .data = &sysctl_igmp_max_memberships,
456 .maxlen = sizeof(int),
457 .mode = 0644,
458 .proc_handler = proc_dointvec
459 },
460 {
461 .procname = "igmp_max_msf",
462 .data = &sysctl_igmp_max_msf,
463 .maxlen = sizeof(int),
464 .mode = 0644,
465 .proc_handler = proc_dointvec
466 },
467 {
468 .procname = "inet_peer_threshold",
469 .data = &inet_peer_threshold,
470 .maxlen = sizeof(int),
471 .mode = 0644,
472 .proc_handler = proc_dointvec
473 },
474 {
475 .procname = "inet_peer_minttl",
476 .data = &inet_peer_minttl,
477 .maxlen = sizeof(int),
478 .mode = 0644,
479 .proc_handler = proc_dointvec_jiffies,
480 },
481 {
482 .procname = "inet_peer_maxttl",
483 .data = &inet_peer_maxttl,
484 .maxlen = sizeof(int),
485 .mode = 0644,
486 .proc_handler = proc_dointvec_jiffies,
487 },
488 {
489 .procname = "tcp_orphan_retries",
490 .data = &sysctl_tcp_orphan_retries,
491 .maxlen = sizeof(int),
492 .mode = 0644,
493 .proc_handler = proc_dointvec
494 },
495 {
496 .procname = "tcp_fack",
497 .data = &sysctl_tcp_fack,
498 .maxlen = sizeof(int),
499 .mode = 0644,
500 .proc_handler = proc_dointvec
501 },
502 {
503 .procname = "tcp_reordering",
504 .data = &sysctl_tcp_reordering,
505 .maxlen = sizeof(int),
506 .mode = 0644,
507 .proc_handler = proc_dointvec
508 },
509 {
510 .procname = "tcp_dsack",
511 .data = &sysctl_tcp_dsack,
512 .maxlen = sizeof(int),
513 .mode = 0644,
514 .proc_handler = proc_dointvec
515 },
516 {
517 .procname = "tcp_mem",
518 .maxlen = sizeof(sysctl_tcp_mem),
519 .data = &sysctl_tcp_mem,
520 .mode = 0644,
521 .proc_handler = proc_doulongvec_minmax,
522 },
523 {
524 .procname = "tcp_wmem",
525 .data = &sysctl_tcp_wmem,
526 .maxlen = sizeof(sysctl_tcp_wmem),
527 .mode = 0644,
528 .proc_handler = proc_dointvec_minmax,
529 .extra1 = &one,
530 },
531 {
532 .procname = "tcp_notsent_lowat",
533 .data = &sysctl_tcp_notsent_lowat,
534 .maxlen = sizeof(sysctl_tcp_notsent_lowat),
535 .mode = 0644,
536 .proc_handler = proc_dointvec,
537 },
538 {
539 .procname = "tcp_rmem",
540 .data = &sysctl_tcp_rmem,
541 .maxlen = sizeof(sysctl_tcp_rmem),
542 .mode = 0644,
543 .proc_handler = proc_dointvec_minmax,
544 .extra1 = &one,
545 },
546 {
547 .procname = "tcp_app_win",
548 .data = &sysctl_tcp_app_win,
549 .maxlen = sizeof(int),
550 .mode = 0644,
551 .proc_handler = proc_dointvec
552 },
553 {
554 .procname = "tcp_adv_win_scale",
555 .data = &sysctl_tcp_adv_win_scale,
556 .maxlen = sizeof(int),
557 .mode = 0644,
558 .proc_handler = proc_dointvec_minmax,
559 .extra1 = &tcp_adv_win_scale_min,
560 .extra2 = &tcp_adv_win_scale_max,
561 },
562 {
563 .procname = "tcp_tw_reuse",
564 .data = &sysctl_tcp_tw_reuse,
565 .maxlen = sizeof(int),
566 .mode = 0644,
567 .proc_handler = proc_dointvec
568 },
569 {
570 .procname = "tcp_frto",
571 .data = &sysctl_tcp_frto,
572 .maxlen = sizeof(int),
573 .mode = 0644,
574 .proc_handler = proc_dointvec
575 },
576 {
577 .procname = "tcp_low_latency",
578 .data = &sysctl_tcp_low_latency,
579 .maxlen = sizeof(int),
580 .mode = 0644,
581 .proc_handler = proc_dointvec
582 },
583 {
584 .procname = "tcp_no_metrics_save",
585 .data = &sysctl_tcp_nometrics_save,
586 .maxlen = sizeof(int),
587 .mode = 0644,
588 .proc_handler = proc_dointvec,
589 },
590 {
591 .procname = "tcp_moderate_rcvbuf",
592 .data = &sysctl_tcp_moderate_rcvbuf,
593 .maxlen = sizeof(int),
594 .mode = 0644,
595 .proc_handler = proc_dointvec,
596 },
597 {
598 .procname = "tcp_tso_win_divisor",
599 .data = &sysctl_tcp_tso_win_divisor,
600 .maxlen = sizeof(int),
601 .mode = 0644,
602 .proc_handler = proc_dointvec,
603 },
604 {
605 .procname = "tcp_congestion_control",
606 .mode = 0644,
607 .maxlen = TCP_CA_NAME_MAX,
608 .proc_handler = proc_tcp_congestion_control,
609 },
610 {
611 .procname = "tcp_mtu_probing",
612 .data = &sysctl_tcp_mtu_probing,
613 .maxlen = sizeof(int),
614 .mode = 0644,
615 .proc_handler = proc_dointvec,
616 },
617 {
618 .procname = "tcp_base_mss",
619 .data = &sysctl_tcp_base_mss,
620 .maxlen = sizeof(int),
621 .mode = 0644,
622 .proc_handler = proc_dointvec,
623 },
624 {
625 .procname = "tcp_workaround_signed_windows",
626 .data = &sysctl_tcp_workaround_signed_windows,
627 .maxlen = sizeof(int),
628 .mode = 0644,
629 .proc_handler = proc_dointvec
630 },
631 {
632 .procname = "tcp_limit_output_bytes",
633 .data = &sysctl_tcp_limit_output_bytes,
634 .maxlen = sizeof(int),
635 .mode = 0644,
636 .proc_handler = proc_dointvec
637 },
638 {
639 .procname = "tcp_challenge_ack_limit",
640 .data = &sysctl_tcp_challenge_ack_limit,
641 .maxlen = sizeof(int),
642 .mode = 0644,
643 .proc_handler = proc_dointvec
644 },
645 #ifdef CONFIG_NET_DMA
646 {
647 .procname = "tcp_dma_copybreak",
648 .data = &sysctl_tcp_dma_copybreak,
649 .maxlen = sizeof(int),
650 .mode = 0644,
651 .proc_handler = proc_dointvec
652 },
653 #endif
654 {
655 .procname = "tcp_slow_start_after_idle",
656 .data = &sysctl_tcp_slow_start_after_idle,
657 .maxlen = sizeof(int),
658 .mode = 0644,
659 .proc_handler = proc_dointvec
660 },
661 #ifdef CONFIG_NETLABEL
662 {
663 .procname = "cipso_cache_enable",
664 .data = &cipso_v4_cache_enabled,
665 .maxlen = sizeof(int),
666 .mode = 0644,
667 .proc_handler = proc_dointvec,
668 },
669 {
670 .procname = "cipso_cache_bucket_size",
671 .data = &cipso_v4_cache_bucketsize,
672 .maxlen = sizeof(int),
673 .mode = 0644,
674 .proc_handler = proc_dointvec,
675 },
676 {
677 .procname = "cipso_rbm_optfmt",
678 .data = &cipso_v4_rbm_optfmt,
679 .maxlen = sizeof(int),
680 .mode = 0644,
681 .proc_handler = proc_dointvec,
682 },
683 {
684 .procname = "cipso_rbm_strictvalid",
685 .data = &cipso_v4_rbm_strictvalid,
686 .maxlen = sizeof(int),
687 .mode = 0644,
688 .proc_handler = proc_dointvec,
689 },
690 #endif /* CONFIG_NETLABEL */
691 {
692 .procname = "tcp_available_congestion_control",
693 .maxlen = TCP_CA_BUF_MAX,
694 .mode = 0444,
695 .proc_handler = proc_tcp_available_congestion_control,
696 },
697 {
698 .procname = "tcp_allowed_congestion_control",
699 .maxlen = TCP_CA_BUF_MAX,
700 .mode = 0644,
701 .proc_handler = proc_allowed_congestion_control,
702 },
703 {
704 .procname = "tcp_thin_linear_timeouts",
705 .data = &sysctl_tcp_thin_linear_timeouts,
706 .maxlen = sizeof(int),
707 .mode = 0644,
708 .proc_handler = proc_dointvec
709 },
710 {
711 .procname = "tcp_thin_dupack",
712 .data = &sysctl_tcp_thin_dupack,
713 .maxlen = sizeof(int),
714 .mode = 0644,
715 .proc_handler = proc_dointvec
716 },
717 {
718 .procname = "tcp_early_retrans",
719 .data = &sysctl_tcp_early_retrans,
720 .maxlen = sizeof(int),
721 .mode = 0644,
722 .proc_handler = proc_dointvec_minmax,
723 .extra1 = &zero,
724 .extra2 = &four,
725 },
726 {
727 .procname = "tcp_min_tso_segs",
728 .data = &sysctl_tcp_min_tso_segs,
729 .maxlen = sizeof(int),
730 .mode = 0644,
731 .proc_handler = proc_dointvec_minmax,
732 .extra1 = &zero,
733 .extra2 = &gso_max_segs,
734 },
735 {
736 .procname = "udp_mem",
737 .data = &sysctl_udp_mem,
738 .maxlen = sizeof(sysctl_udp_mem),
739 .mode = 0644,
740 .proc_handler = proc_doulongvec_minmax,
741 },
742 {
743 .procname = "udp_rmem_min",
744 .data = &sysctl_udp_rmem_min,
745 .maxlen = sizeof(sysctl_udp_rmem_min),
746 .mode = 0644,
747 .proc_handler = proc_dointvec_minmax,
748 .extra1 = &one
749 },
750 {
751 .procname = "udp_wmem_min",
752 .data = &sysctl_udp_wmem_min,
753 .maxlen = sizeof(sysctl_udp_wmem_min),
754 .mode = 0644,
755 .proc_handler = proc_dointvec_minmax,
756 .extra1 = &one
757 },
758 { }
759 };
760
761 static struct ctl_table ipv4_net_table[] = {
762 {
763 .procname = "icmp_echo_ignore_all",
764 .data = &init_net.ipv4.sysctl_icmp_echo_ignore_all,
765 .maxlen = sizeof(int),
766 .mode = 0644,
767 .proc_handler = proc_dointvec
768 },
769 {
770 .procname = "icmp_echo_ignore_broadcasts",
771 .data = &init_net.ipv4.sysctl_icmp_echo_ignore_broadcasts,
772 .maxlen = sizeof(int),
773 .mode = 0644,
774 .proc_handler = proc_dointvec
775 },
776 {
777 .procname = "icmp_ignore_bogus_error_responses",
778 .data = &init_net.ipv4.sysctl_icmp_ignore_bogus_error_responses,
779 .maxlen = sizeof(int),
780 .mode = 0644,
781 .proc_handler = proc_dointvec
782 },
783 {
784 .procname = "icmp_errors_use_inbound_ifaddr",
785 .data = &init_net.ipv4.sysctl_icmp_errors_use_inbound_ifaddr,
786 .maxlen = sizeof(int),
787 .mode = 0644,
788 .proc_handler = proc_dointvec
789 },
790 {
791 .procname = "icmp_ratelimit",
792 .data = &init_net.ipv4.sysctl_icmp_ratelimit,
793 .maxlen = sizeof(int),
794 .mode = 0644,
795 .proc_handler = proc_dointvec_ms_jiffies,
796 },
797 {
798 .procname = "icmp_ratemask",
799 .data = &init_net.ipv4.sysctl_icmp_ratemask,
800 .maxlen = sizeof(int),
801 .mode = 0644,
802 .proc_handler = proc_dointvec
803 },
804 {
805 .procname = "ping_group_range",
806 .data = &init_net.ipv4.sysctl_ping_group_range,
807 .maxlen = sizeof(gid_t)*2,
808 .mode = 0644,
809 .proc_handler = ipv4_ping_group_range,
810 },
811 {
812 .procname = "tcp_ecn",
813 .data = &init_net.ipv4.sysctl_tcp_ecn,
814 .maxlen = sizeof(int),
815 .mode = 0644,
816 .proc_handler = proc_dointvec
817 },
818 {
819 .procname = "ip_local_port_range",
820 .maxlen = sizeof(init_net.ipv4.sysctl_local_ports.range),
821 .data = &init_net.ipv4.sysctl_local_ports.range,
822 .mode = 0644,
823 .proc_handler = ipv4_local_port_range,
824 },
825 { }
826 };
827
828 static __net_init int ipv4_sysctl_init_net(struct net *net)
829 {
830 struct ctl_table *table;
831
832 table = ipv4_net_table;
833 if (!net_eq(net, &init_net)) {
834 int i;
835
836 table = kmemdup(table, sizeof(ipv4_net_table), GFP_KERNEL);
837 if (table == NULL)
838 goto err_alloc;
839
840 /* Update the variables to point into the current struct net */
841 for (i = 0; i < ARRAY_SIZE(ipv4_net_table) - 1; i++)
842 table[i].data += (void *)net - (void *)&init_net;
843 }
844
845 /*
846 * Sane defaults - nobody may create ping sockets.
847 * Boot scripts should set this to distro-specific group.
848 */
849 net->ipv4.sysctl_ping_group_range[0] = make_kgid(&init_user_ns, 1);
850 net->ipv4.sysctl_ping_group_range[1] = make_kgid(&init_user_ns, 0);
851
852 /*
853 * Set defaults for local port range
854 */
855 seqlock_init(&net->ipv4.sysctl_local_ports.lock);
856 net->ipv4.sysctl_local_ports.range[0] = 32768;
857 net->ipv4.sysctl_local_ports.range[1] = 61000;
858
859 net->ipv4.ipv4_hdr = register_net_sysctl(net, "net/ipv4", table);
860 if (net->ipv4.ipv4_hdr == NULL)
861 goto err_reg;
862
863 return 0;
864
865 err_reg:
866 if (!net_eq(net, &init_net))
867 kfree(table);
868 err_alloc:
869 return -ENOMEM;
870 }
871
872 static __net_exit void ipv4_sysctl_exit_net(struct net *net)
873 {
874 struct ctl_table *table;
875
876 table = net->ipv4.ipv4_hdr->ctl_table_arg;
877 unregister_net_sysctl_table(net->ipv4.ipv4_hdr);
878 kfree(table);
879 }
880
881 static __net_initdata struct pernet_operations ipv4_sysctl_ops = {
882 .init = ipv4_sysctl_init_net,
883 .exit = ipv4_sysctl_exit_net,
884 };
885
886 static __init int sysctl_ipv4_init(void)
887 {
888 struct ctl_table_header *hdr;
889 struct ctl_table *i;
890
891 for (i = ipv4_table; i->procname; i++) {
892 if (strcmp(i->procname, "ip_local_reserved_ports") == 0) {
893 i->data = sysctl_local_reserved_ports;
894 break;
895 }
896 }
897 if (!i->procname)
898 return -EINVAL;
899
900 hdr = register_net_sysctl(&init_net, "net/ipv4", ipv4_table);
901 if (hdr == NULL)
902 return -ENOMEM;
903
904 if (register_pernet_subsys(&ipv4_sysctl_ops)) {
905 unregister_net_sysctl_table(hdr);
906 return -ENOMEM;
907 }
908
909 return 0;
910 }
911
912 __initcall(sysctl_ipv4_init);
Linux kernel - Deliverables
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