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[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 bool same_parity = !((range[0] ^ range[1]) & 1);
49
50 write_seqlock(&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(&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_syn_retries",
296 .data = &sysctl_tcp_syn_retries,
297 .maxlen = sizeof(int),
298 .mode = 0644,
299 .proc_handler = proc_dointvec_minmax,
300 .extra1 = &tcp_syn_retries_min,
301 .extra2 = &tcp_syn_retries_max
302 },
303 {
304 .procname = "tcp_synack_retries",
305 .data = &sysctl_tcp_synack_retries,
306 .maxlen = sizeof(int),
307 .mode = 0644,
308 .proc_handler = proc_dointvec
309 },
310 {
311 .procname = "tcp_max_orphans",
312 .data = &sysctl_tcp_max_orphans,
313 .maxlen = sizeof(int),
314 .mode = 0644,
315 .proc_handler = proc_dointvec
316 },
317 {
318 .procname = "tcp_max_tw_buckets",
319 .data = &tcp_death_row.sysctl_max_tw_buckets,
320 .maxlen = sizeof(int),
321 .mode = 0644,
322 .proc_handler = proc_dointvec
323 },
324 {
325 .procname = "ip_early_demux",
326 .data = &sysctl_ip_early_demux,
327 .maxlen = sizeof(int),
328 .mode = 0644,
329 .proc_handler = proc_dointvec
330 },
331 {
332 .procname = "ip_dynaddr",
333 .data = &sysctl_ip_dynaddr,
334 .maxlen = sizeof(int),
335 .mode = 0644,
336 .proc_handler = proc_dointvec
337 },
338 {
339 .procname = "tcp_keepalive_time",
340 .data = &sysctl_tcp_keepalive_time,
341 .maxlen = sizeof(int),
342 .mode = 0644,
343 .proc_handler = proc_dointvec_jiffies,
344 },
345 {
346 .procname = "tcp_keepalive_probes",
347 .data = &sysctl_tcp_keepalive_probes,
348 .maxlen = sizeof(int),
349 .mode = 0644,
350 .proc_handler = proc_dointvec
351 },
352 {
353 .procname = "tcp_keepalive_intvl",
354 .data = &sysctl_tcp_keepalive_intvl,
355 .maxlen = sizeof(int),
356 .mode = 0644,
357 .proc_handler = proc_dointvec_jiffies,
358 },
359 {
360 .procname = "tcp_retries1",
361 .data = &sysctl_tcp_retries1,
362 .maxlen = sizeof(int),
363 .mode = 0644,
364 .proc_handler = proc_dointvec_minmax,
365 .extra2 = &tcp_retr1_max
366 },
367 {
368 .procname = "tcp_retries2",
369 .data = &sysctl_tcp_retries2,
370 .maxlen = sizeof(int),
371 .mode = 0644,
372 .proc_handler = proc_dointvec
373 },
374 {
375 .procname = "tcp_fin_timeout",
376 .data = &sysctl_tcp_fin_timeout,
377 .maxlen = sizeof(int),
378 .mode = 0644,
379 .proc_handler = proc_dointvec_jiffies,
380 },
381 #ifdef CONFIG_SYN_COOKIES
382 {
383 .procname = "tcp_syncookies",
384 .data = &sysctl_tcp_syncookies,
385 .maxlen = sizeof(int),
386 .mode = 0644,
387 .proc_handler = proc_dointvec
388 },
389 #endif
390 {
391 .procname = "tcp_fastopen",
392 .data = &sysctl_tcp_fastopen,
393 .maxlen = sizeof(int),
394 .mode = 0644,
395 .proc_handler = proc_dointvec,
396 },
397 {
398 .procname = "tcp_fastopen_key",
399 .mode = 0600,
400 .maxlen = ((TCP_FASTOPEN_KEY_LENGTH * 2) + 10),
401 .proc_handler = proc_tcp_fastopen_key,
402 },
403 {
404 .procname = "tcp_tw_recycle",
405 .data = &tcp_death_row.sysctl_tw_recycle,
406 .maxlen = sizeof(int),
407 .mode = 0644,
408 .proc_handler = proc_dointvec
409 },
410 {
411 .procname = "tcp_abort_on_overflow",
412 .data = &sysctl_tcp_abort_on_overflow,
413 .maxlen = sizeof(int),
414 .mode = 0644,
415 .proc_handler = proc_dointvec
416 },
417 {
418 .procname = "tcp_stdurg",
419 .data = &sysctl_tcp_stdurg,
420 .maxlen = sizeof(int),
421 .mode = 0644,
422 .proc_handler = proc_dointvec
423 },
424 {
425 .procname = "tcp_rfc1337",
426 .data = &sysctl_tcp_rfc1337,
427 .maxlen = sizeof(int),
428 .mode = 0644,
429 .proc_handler = proc_dointvec
430 },
431 {
432 .procname = "tcp_max_syn_backlog",
433 .data = &sysctl_max_syn_backlog,
434 .maxlen = sizeof(int),
435 .mode = 0644,
436 .proc_handler = proc_dointvec
437 },
438 {
439 .procname = "igmp_max_memberships",
440 .data = &sysctl_igmp_max_memberships,
441 .maxlen = sizeof(int),
442 .mode = 0644,
443 .proc_handler = proc_dointvec
444 },
445 {
446 .procname = "igmp_max_msf",
447 .data = &sysctl_igmp_max_msf,
448 .maxlen = sizeof(int),
449 .mode = 0644,
450 .proc_handler = proc_dointvec
451 },
452 #ifdef CONFIG_IP_MULTICAST
453 {
454 .procname = "igmp_qrv",
455 .data = &sysctl_igmp_qrv,
456 .maxlen = sizeof(int),
457 .mode = 0644,
458 .proc_handler = proc_dointvec_minmax,
459 .extra1 = &one
460 },
461 #endif
462 {
463 .procname = "inet_peer_threshold",
464 .data = &inet_peer_threshold,
465 .maxlen = sizeof(int),
466 .mode = 0644,
467 .proc_handler = proc_dointvec
468 },
469 {
470 .procname = "inet_peer_minttl",
471 .data = &inet_peer_minttl,
472 .maxlen = sizeof(int),
473 .mode = 0644,
474 .proc_handler = proc_dointvec_jiffies,
475 },
476 {
477 .procname = "inet_peer_maxttl",
478 .data = &inet_peer_maxttl,
479 .maxlen = sizeof(int),
480 .mode = 0644,
481 .proc_handler = proc_dointvec_jiffies,
482 },
483 {
484 .procname = "tcp_orphan_retries",
485 .data = &sysctl_tcp_orphan_retries,
486 .maxlen = sizeof(int),
487 .mode = 0644,
488 .proc_handler = proc_dointvec
489 },
490 {
491 .procname = "tcp_fack",
492 .data = &sysctl_tcp_fack,
493 .maxlen = sizeof(int),
494 .mode = 0644,
495 .proc_handler = proc_dointvec
496 },
497 {
498 .procname = "tcp_reordering",
499 .data = &sysctl_tcp_reordering,
500 .maxlen = sizeof(int),
501 .mode = 0644,
502 .proc_handler = proc_dointvec
503 },
504 {
505 .procname = "tcp_max_reordering",
506 .data = &sysctl_tcp_max_reordering,
507 .maxlen = sizeof(int),
508 .mode = 0644,
509 .proc_handler = proc_dointvec
510 },
511 {
512 .procname = "tcp_dsack",
513 .data = &sysctl_tcp_dsack,
514 .maxlen = sizeof(int),
515 .mode = 0644,
516 .proc_handler = proc_dointvec
517 },
518 {
519 .procname = "tcp_mem",
520 .maxlen = sizeof(sysctl_tcp_mem),
521 .data = &sysctl_tcp_mem,
522 .mode = 0644,
523 .proc_handler = proc_doulongvec_minmax,
524 },
525 {
526 .procname = "tcp_wmem",
527 .data = &sysctl_tcp_wmem,
528 .maxlen = sizeof(sysctl_tcp_wmem),
529 .mode = 0644,
530 .proc_handler = proc_dointvec_minmax,
531 .extra1 = &one,
532 },
533 {
534 .procname = "tcp_notsent_lowat",
535 .data = &sysctl_tcp_notsent_lowat,
536 .maxlen = sizeof(sysctl_tcp_notsent_lowat),
537 .mode = 0644,
538 .proc_handler = proc_dointvec,
539 },
540 {
541 .procname = "tcp_rmem",
542 .data = &sysctl_tcp_rmem,
543 .maxlen = sizeof(sysctl_tcp_rmem),
544 .mode = 0644,
545 .proc_handler = proc_dointvec_minmax,
546 .extra1 = &one,
547 },
548 {
549 .procname = "tcp_app_win",
550 .data = &sysctl_tcp_app_win,
551 .maxlen = sizeof(int),
552 .mode = 0644,
553 .proc_handler = proc_dointvec
554 },
555 {
556 .procname = "tcp_adv_win_scale",
557 .data = &sysctl_tcp_adv_win_scale,
558 .maxlen = sizeof(int),
559 .mode = 0644,
560 .proc_handler = proc_dointvec_minmax,
561 .extra1 = &tcp_adv_win_scale_min,
562 .extra2 = &tcp_adv_win_scale_max,
563 },
564 {
565 .procname = "tcp_tw_reuse",
566 .data = &sysctl_tcp_tw_reuse,
567 .maxlen = sizeof(int),
568 .mode = 0644,
569 .proc_handler = proc_dointvec
570 },
571 {
572 .procname = "tcp_frto",
573 .data = &sysctl_tcp_frto,
574 .maxlen = sizeof(int),
575 .mode = 0644,
576 .proc_handler = proc_dointvec
577 },
578 {
579 .procname = "tcp_low_latency",
580 .data = &sysctl_tcp_low_latency,
581 .maxlen = sizeof(int),
582 .mode = 0644,
583 .proc_handler = proc_dointvec
584 },
585 {
586 .procname = "tcp_no_metrics_save",
587 .data = &sysctl_tcp_nometrics_save,
588 .maxlen = sizeof(int),
589 .mode = 0644,
590 .proc_handler = proc_dointvec,
591 },
592 {
593 .procname = "tcp_moderate_rcvbuf",
594 .data = &sysctl_tcp_moderate_rcvbuf,
595 .maxlen = sizeof(int),
596 .mode = 0644,
597 .proc_handler = proc_dointvec,
598 },
599 {
600 .procname = "tcp_tso_win_divisor",
601 .data = &sysctl_tcp_tso_win_divisor,
602 .maxlen = sizeof(int),
603 .mode = 0644,
604 .proc_handler = proc_dointvec,
605 },
606 {
607 .procname = "tcp_congestion_control",
608 .mode = 0644,
609 .maxlen = TCP_CA_NAME_MAX,
610 .proc_handler = proc_tcp_congestion_control,
611 },
612 {
613 .procname = "tcp_workaround_signed_windows",
614 .data = &sysctl_tcp_workaround_signed_windows,
615 .maxlen = sizeof(int),
616 .mode = 0644,
617 .proc_handler = proc_dointvec
618 },
619 {
620 .procname = "tcp_limit_output_bytes",
621 .data = &sysctl_tcp_limit_output_bytes,
622 .maxlen = sizeof(int),
623 .mode = 0644,
624 .proc_handler = proc_dointvec
625 },
626 {
627 .procname = "tcp_challenge_ack_limit",
628 .data = &sysctl_tcp_challenge_ack_limit,
629 .maxlen = sizeof(int),
630 .mode = 0644,
631 .proc_handler = proc_dointvec
632 },
633 {
634 .procname = "tcp_slow_start_after_idle",
635 .data = &sysctl_tcp_slow_start_after_idle,
636 .maxlen = sizeof(int),
637 .mode = 0644,
638 .proc_handler = proc_dointvec
639 },
640 #ifdef CONFIG_NETLABEL
641 {
642 .procname = "cipso_cache_enable",
643 .data = &cipso_v4_cache_enabled,
644 .maxlen = sizeof(int),
645 .mode = 0644,
646 .proc_handler = proc_dointvec,
647 },
648 {
649 .procname = "cipso_cache_bucket_size",
650 .data = &cipso_v4_cache_bucketsize,
651 .maxlen = sizeof(int),
652 .mode = 0644,
653 .proc_handler = proc_dointvec,
654 },
655 {
656 .procname = "cipso_rbm_optfmt",
657 .data = &cipso_v4_rbm_optfmt,
658 .maxlen = sizeof(int),
659 .mode = 0644,
660 .proc_handler = proc_dointvec,
661 },
662 {
663 .procname = "cipso_rbm_strictvalid",
664 .data = &cipso_v4_rbm_strictvalid,
665 .maxlen = sizeof(int),
666 .mode = 0644,
667 .proc_handler = proc_dointvec,
668 },
669 #endif /* CONFIG_NETLABEL */
670 {
671 .procname = "tcp_available_congestion_control",
672 .maxlen = TCP_CA_BUF_MAX,
673 .mode = 0444,
674 .proc_handler = proc_tcp_available_congestion_control,
675 },
676 {
677 .procname = "tcp_allowed_congestion_control",
678 .maxlen = TCP_CA_BUF_MAX,
679 .mode = 0644,
680 .proc_handler = proc_allowed_congestion_control,
681 },
682 {
683 .procname = "tcp_thin_linear_timeouts",
684 .data = &sysctl_tcp_thin_linear_timeouts,
685 .maxlen = sizeof(int),
686 .mode = 0644,
687 .proc_handler = proc_dointvec
688 },
689 {
690 .procname = "tcp_thin_dupack",
691 .data = &sysctl_tcp_thin_dupack,
692 .maxlen = sizeof(int),
693 .mode = 0644,
694 .proc_handler = proc_dointvec
695 },
696 {
697 .procname = "tcp_early_retrans",
698 .data = &sysctl_tcp_early_retrans,
699 .maxlen = sizeof(int),
700 .mode = 0644,
701 .proc_handler = proc_dointvec_minmax,
702 .extra1 = &zero,
703 .extra2 = &four,
704 },
705 {
706 .procname = "tcp_min_tso_segs",
707 .data = &sysctl_tcp_min_tso_segs,
708 .maxlen = sizeof(int),
709 .mode = 0644,
710 .proc_handler = proc_dointvec_minmax,
711 .extra1 = &one,
712 .extra2 = &gso_max_segs,
713 },
714 {
715 .procname = "tcp_autocorking",
716 .data = &sysctl_tcp_autocorking,
717 .maxlen = sizeof(int),
718 .mode = 0644,
719 .proc_handler = proc_dointvec_minmax,
720 .extra1 = &zero,
721 .extra2 = &one,
722 },
723 {
724 .procname = "tcp_invalid_ratelimit",
725 .data = &sysctl_tcp_invalid_ratelimit,
726 .maxlen = sizeof(int),
727 .mode = 0644,
728 .proc_handler = proc_dointvec_ms_jiffies,
729 },
730 {
731 .procname = "icmp_msgs_per_sec",
732 .data = &sysctl_icmp_msgs_per_sec,
733 .maxlen = sizeof(int),
734 .mode = 0644,
735 .proc_handler = proc_dointvec_minmax,
736 .extra1 = &zero,
737 },
738 {
739 .procname = "icmp_msgs_burst",
740 .data = &sysctl_icmp_msgs_burst,
741 .maxlen = sizeof(int),
742 .mode = 0644,
743 .proc_handler = proc_dointvec_minmax,
744 .extra1 = &zero,
745 },
746 {
747 .procname = "udp_mem",
748 .data = &sysctl_udp_mem,
749 .maxlen = sizeof(sysctl_udp_mem),
750 .mode = 0644,
751 .proc_handler = proc_doulongvec_minmax,
752 },
753 {
754 .procname = "udp_rmem_min",
755 .data = &sysctl_udp_rmem_min,
756 .maxlen = sizeof(sysctl_udp_rmem_min),
757 .mode = 0644,
758 .proc_handler = proc_dointvec_minmax,
759 .extra1 = &one
760 },
761 {
762 .procname = "udp_wmem_min",
763 .data = &sysctl_udp_wmem_min,
764 .maxlen = sizeof(sysctl_udp_wmem_min),
765 .mode = 0644,
766 .proc_handler = proc_dointvec_minmax,
767 .extra1 = &one
768 },
769 { }
770 };
771
772 static struct ctl_table ipv4_net_table[] = {
773 {
774 .procname = "icmp_echo_ignore_all",
775 .data = &init_net.ipv4.sysctl_icmp_echo_ignore_all,
776 .maxlen = sizeof(int),
777 .mode = 0644,
778 .proc_handler = proc_dointvec
779 },
780 {
781 .procname = "icmp_echo_ignore_broadcasts",
782 .data = &init_net.ipv4.sysctl_icmp_echo_ignore_broadcasts,
783 .maxlen = sizeof(int),
784 .mode = 0644,
785 .proc_handler = proc_dointvec
786 },
787 {
788 .procname = "icmp_ignore_bogus_error_responses",
789 .data = &init_net.ipv4.sysctl_icmp_ignore_bogus_error_responses,
790 .maxlen = sizeof(int),
791 .mode = 0644,
792 .proc_handler = proc_dointvec
793 },
794 {
795 .procname = "icmp_errors_use_inbound_ifaddr",
796 .data = &init_net.ipv4.sysctl_icmp_errors_use_inbound_ifaddr,
797 .maxlen = sizeof(int),
798 .mode = 0644,
799 .proc_handler = proc_dointvec
800 },
801 {
802 .procname = "icmp_ratelimit",
803 .data = &init_net.ipv4.sysctl_icmp_ratelimit,
804 .maxlen = sizeof(int),
805 .mode = 0644,
806 .proc_handler = proc_dointvec_ms_jiffies,
807 },
808 {
809 .procname = "icmp_ratemask",
810 .data = &init_net.ipv4.sysctl_icmp_ratemask,
811 .maxlen = sizeof(int),
812 .mode = 0644,
813 .proc_handler = proc_dointvec
814 },
815 {
816 .procname = "ping_group_range",
817 .data = &init_net.ipv4.ping_group_range.range,
818 .maxlen = sizeof(gid_t)*2,
819 .mode = 0644,
820 .proc_handler = ipv4_ping_group_range,
821 },
822 {
823 .procname = "tcp_ecn",
824 .data = &init_net.ipv4.sysctl_tcp_ecn,
825 .maxlen = sizeof(int),
826 .mode = 0644,
827 .proc_handler = proc_dointvec
828 },
829 {
830 .procname = "tcp_ecn_fallback",
831 .data = &init_net.ipv4.sysctl_tcp_ecn_fallback,
832 .maxlen = sizeof(int),
833 .mode = 0644,
834 .proc_handler = proc_dointvec
835 },
836 {
837 .procname = "ip_local_port_range",
838 .maxlen = sizeof(init_net.ipv4.ip_local_ports.range),
839 .data = &init_net.ipv4.ip_local_ports.range,
840 .mode = 0644,
841 .proc_handler = ipv4_local_port_range,
842 },
843 {
844 .procname = "ip_local_reserved_ports",
845 .data = &init_net.ipv4.sysctl_local_reserved_ports,
846 .maxlen = 65536,
847 .mode = 0644,
848 .proc_handler = proc_do_large_bitmap,
849 },
850 {
851 .procname = "ip_no_pmtu_disc",
852 .data = &init_net.ipv4.sysctl_ip_no_pmtu_disc,
853 .maxlen = sizeof(int),
854 .mode = 0644,
855 .proc_handler = proc_dointvec
856 },
857 {
858 .procname = "ip_forward_use_pmtu",
859 .data = &init_net.ipv4.sysctl_ip_fwd_use_pmtu,
860 .maxlen = sizeof(int),
861 .mode = 0644,
862 .proc_handler = proc_dointvec,
863 },
864 {
865 .procname = "ip_nonlocal_bind",
866 .data = &init_net.ipv4.sysctl_ip_nonlocal_bind,
867 .maxlen = sizeof(int),
868 .mode = 0644,
869 .proc_handler = proc_dointvec
870 },
871 {
872 .procname = "fwmark_reflect",
873 .data = &init_net.ipv4.sysctl_fwmark_reflect,
874 .maxlen = sizeof(int),
875 .mode = 0644,
876 .proc_handler = proc_dointvec,
877 },
878 {
879 .procname = "tcp_fwmark_accept",
880 .data = &init_net.ipv4.sysctl_tcp_fwmark_accept,
881 .maxlen = sizeof(int),
882 .mode = 0644,
883 .proc_handler = proc_dointvec,
884 },
885 {
886 .procname = "tcp_mtu_probing",
887 .data = &init_net.ipv4.sysctl_tcp_mtu_probing,
888 .maxlen = sizeof(int),
889 .mode = 0644,
890 .proc_handler = proc_dointvec,
891 },
892 {
893 .procname = "tcp_base_mss",
894 .data = &init_net.ipv4.sysctl_tcp_base_mss,
895 .maxlen = sizeof(int),
896 .mode = 0644,
897 .proc_handler = proc_dointvec,
898 },
899 {
900 .procname = "tcp_probe_threshold",
901 .data = &init_net.ipv4.sysctl_tcp_probe_threshold,
902 .maxlen = sizeof(int),
903 .mode = 0644,
904 .proc_handler = proc_dointvec,
905 },
906 {
907 .procname = "tcp_probe_interval",
908 .data = &init_net.ipv4.sysctl_tcp_probe_interval,
909 .maxlen = sizeof(int),
910 .mode = 0644,
911 .proc_handler = proc_dointvec,
912 },
913 { }
914 };
915
916 static __net_init int ipv4_sysctl_init_net(struct net *net)
917 {
918 struct ctl_table *table;
919
920 table = ipv4_net_table;
921 if (!net_eq(net, &init_net)) {
922 int i;
923
924 table = kmemdup(table, sizeof(ipv4_net_table), GFP_KERNEL);
925 if (!table)
926 goto err_alloc;
927
928 /* Update the variables to point into the current struct net */
929 for (i = 0; i < ARRAY_SIZE(ipv4_net_table) - 1; i++)
930 table[i].data += (void *)net - (void *)&init_net;
931 }
932
933 net->ipv4.ipv4_hdr = register_net_sysctl(net, "net/ipv4", table);
934 if (!net->ipv4.ipv4_hdr)
935 goto err_reg;
936
937 net->ipv4.sysctl_local_reserved_ports = kzalloc(65536 / 8, GFP_KERNEL);
938 if (!net->ipv4.sysctl_local_reserved_ports)
939 goto err_ports;
940
941 return 0;
942
943 err_ports:
944 unregister_net_sysctl_table(net->ipv4.ipv4_hdr);
945 err_reg:
946 if (!net_eq(net, &init_net))
947 kfree(table);
948 err_alloc:
949 return -ENOMEM;
950 }
951
952 static __net_exit void ipv4_sysctl_exit_net(struct net *net)
953 {
954 struct ctl_table *table;
955
956 kfree(net->ipv4.sysctl_local_reserved_ports);
957 table = net->ipv4.ipv4_hdr->ctl_table_arg;
958 unregister_net_sysctl_table(net->ipv4.ipv4_hdr);
959 kfree(table);
960 }
961
962 static __net_initdata struct pernet_operations ipv4_sysctl_ops = {
963 .init = ipv4_sysctl_init_net,
964 .exit = ipv4_sysctl_exit_net,
965 };
966
967 static __init int sysctl_ipv4_init(void)
968 {
969 struct ctl_table_header *hdr;
970
971 hdr = register_net_sysctl(&init_net, "net/ipv4", ipv4_table);
972 if (!hdr)
973 return -ENOMEM;
974
975 if (register_pernet_subsys(&ipv4_sysctl_ops)) {
976 unregister_net_sysctl_table(hdr);
977 return -ENOMEM;
978 }
979
980 return 0;
981 }
982
983 __initcall(sysctl_ipv4_init);
Linux kernel - Deliverables
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