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clk: Add clk_hw_*() APIs for use by clk providers
[linux-2.6/btrfs-unstable.git] / net / ipv4 / sysctl_net_ipv4.c
blob433231ccfb17fc6d01179247d1d81226803d18df
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 static int min_sndbuf = SOCK_MIN_SNDBUF;
45 static int min_rcvbuf = SOCK_MIN_RCVBUF;
46
47 /* Update system visible IP port range */
48 static void set_local_port_range(struct net *net, int range[2])
49 {
50 bool same_parity = !((range[0] ^ range[1]) & 1);
51
52 write_seqlock(&net->ipv4.ip_local_ports.lock);
53 if (same_parity && !net->ipv4.ip_local_ports.warned) {
54 net->ipv4.ip_local_ports.warned = true;
55 pr_err_ratelimited("ip_local_port_range: prefer different parity for start/end values.\n");
56 }
57 net->ipv4.ip_local_ports.range[0] = range[0];
58 net->ipv4.ip_local_ports.range[1] = range[1];
59 write_sequnlock(&net->ipv4.ip_local_ports.lock);
60 }
61
62 /* Validate changes from /proc interface. */
63 static int ipv4_local_port_range(struct ctl_table *table, int write,
64 void __user *buffer,
65 size_t *lenp, loff_t *ppos)
66 {
67 struct net *net =
68 container_of(table->data, struct net, ipv4.ip_local_ports.range);
69 int ret;
70 int range[2];
71 struct ctl_table tmp = {
72 .data = &range,
73 .maxlen = sizeof(range),
74 .mode = table->mode,
75 .extra1 = &ip_local_port_range_min,
76 .extra2 = &ip_local_port_range_max,
77 };
78
79 inet_get_local_port_range(net, &range[0], &range[1]);
80
81 ret = proc_dointvec_minmax(&tmp, write, buffer, lenp, ppos);
82
83 if (write && ret == 0) {
84 if (range[1] < range[0])
85 ret = -EINVAL;
86 else
87 set_local_port_range(net, range);
88 }
89
90 return ret;
91 }
92
93
94 static void inet_get_ping_group_range_table(struct ctl_table *table, kgid_t *low, kgid_t *high)
95 {
96 kgid_t *data = table->data;
97 struct net *net =
98 container_of(table->data, struct net, ipv4.ping_group_range.range);
99 unsigned int seq;
100 do {
101 seq = read_seqbegin(&net->ipv4.ip_local_ports.lock);
102
103 *low = data[0];
104 *high = data[1];
105 } while (read_seqretry(&net->ipv4.ip_local_ports.lock, seq));
106 }
107
108 /* Update system visible IP port range */
109 static void set_ping_group_range(struct ctl_table *table, kgid_t low, kgid_t high)
110 {
111 kgid_t *data = table->data;
112 struct net *net =
113 container_of(table->data, struct net, ipv4.ping_group_range.range);
114 write_seqlock(&net->ipv4.ip_local_ports.lock);
115 data[0] = low;
116 data[1] = high;
117 write_sequnlock(&net->ipv4.ip_local_ports.lock);
118 }
119
120 /* Validate changes from /proc interface. */
121 static int ipv4_ping_group_range(struct ctl_table *table, int write,
122 void __user *buffer,
123 size_t *lenp, loff_t *ppos)
124 {
125 struct user_namespace *user_ns = current_user_ns();
126 int ret;
127 gid_t urange[2];
128 kgid_t low, high;
129 struct ctl_table tmp = {
130 .data = &urange,
131 .maxlen = sizeof(urange),
132 .mode = table->mode,
133 .extra1 = &ip_ping_group_range_min,
134 .extra2 = &ip_ping_group_range_max,
135 };
136
137 inet_get_ping_group_range_table(table, &low, &high);
138 urange[0] = from_kgid_munged(user_ns, low);
139 urange[1] = from_kgid_munged(user_ns, high);
140 ret = proc_dointvec_minmax(&tmp, write, buffer, lenp, ppos);
141
142 if (write && ret == 0) {
143 low = make_kgid(user_ns, urange[0]);
144 high = make_kgid(user_ns, urange[1]);
145 if (!gid_valid(low) || !gid_valid(high) ||
146 (urange[1] < urange[0]) || gid_lt(high, low)) {
147 low = make_kgid(&init_user_ns, 1);
148 high = make_kgid(&init_user_ns, 0);
149 }
150 set_ping_group_range(table, low, high);
151 }
152
153 return ret;
154 }
155
156 static int proc_tcp_congestion_control(struct ctl_table *ctl, int write,
157 void __user *buffer, size_t *lenp, loff_t *ppos)
158 {
159 char val[TCP_CA_NAME_MAX];
160 struct ctl_table tbl = {
161 .data = val,
162 .maxlen = TCP_CA_NAME_MAX,
163 };
164 int ret;
165
166 tcp_get_default_congestion_control(val);
167
168 ret = proc_dostring(&tbl, write, buffer, lenp, ppos);
169 if (write && ret == 0)
170 ret = tcp_set_default_congestion_control(val);
171 return ret;
172 }
173
174 static int proc_tcp_available_congestion_control(struct ctl_table *ctl,
175 int write,
176 void __user *buffer, size_t *lenp,
177 loff_t *ppos)
178 {
179 struct ctl_table tbl = { .maxlen = TCP_CA_BUF_MAX, };
180 int ret;
181
182 tbl.data = kmalloc(tbl.maxlen, GFP_USER);
183 if (!tbl.data)
184 return -ENOMEM;
185 tcp_get_available_congestion_control(tbl.data, TCP_CA_BUF_MAX);
186 ret = proc_dostring(&tbl, write, buffer, lenp, ppos);
187 kfree(tbl.data);
188 return ret;
189 }
190
191 static int proc_allowed_congestion_control(struct ctl_table *ctl,
192 int write,
193 void __user *buffer, size_t *lenp,
194 loff_t *ppos)
195 {
196 struct ctl_table tbl = { .maxlen = TCP_CA_BUF_MAX };
197 int ret;
198
199 tbl.data = kmalloc(tbl.maxlen, GFP_USER);
200 if (!tbl.data)
201 return -ENOMEM;
202
203 tcp_get_allowed_congestion_control(tbl.data, tbl.maxlen);
204 ret = proc_dostring(&tbl, write, buffer, lenp, ppos);
205 if (write && ret == 0)
206 ret = tcp_set_allowed_congestion_control(tbl.data);
207 kfree(tbl.data);
208 return ret;
209 }
210
211 static int proc_tcp_fastopen_key(struct ctl_table *ctl, int write,
212 void __user *buffer, size_t *lenp,
213 loff_t *ppos)
214 {
215 struct ctl_table tbl = { .maxlen = (TCP_FASTOPEN_KEY_LENGTH * 2 + 10) };
216 struct tcp_fastopen_context *ctxt;
217 int ret;
218 u32 user_key[4]; /* 16 bytes, matching TCP_FASTOPEN_KEY_LENGTH */
219
220 tbl.data = kmalloc(tbl.maxlen, GFP_KERNEL);
221 if (!tbl.data)
222 return -ENOMEM;
223
224 rcu_read_lock();
225 ctxt = rcu_dereference(tcp_fastopen_ctx);
226 if (ctxt)
227 memcpy(user_key, ctxt->key, TCP_FASTOPEN_KEY_LENGTH);
228 else
229 memset(user_key, 0, sizeof(user_key));
230 rcu_read_unlock();
231
232 snprintf(tbl.data, tbl.maxlen, "%08x-%08x-%08x-%08x",
233 user_key[0], user_key[1], user_key[2], user_key[3]);
234 ret = proc_dostring(&tbl, write, buffer, lenp, ppos);
235
236 if (write && ret == 0) {
237 if (sscanf(tbl.data, "%x-%x-%x-%x", user_key, user_key + 1,
238 user_key + 2, user_key + 3) != 4) {
239 ret = -EINVAL;
240 goto bad_key;
241 }
242 /* Generate a dummy secret but don't publish it. This
243 * is needed so we don't regenerate a new key on the
244 * first invocation of tcp_fastopen_cookie_gen
245 */
246 tcp_fastopen_init_key_once(false);
247 tcp_fastopen_reset_cipher(user_key, TCP_FASTOPEN_KEY_LENGTH);
248 }
249
250 bad_key:
251 pr_debug("proc FO key set 0x%x-%x-%x-%x <- 0x%s: %u\n",
252 user_key[0], user_key[1], user_key[2], user_key[3],
253 (char *)tbl.data, ret);
254 kfree(tbl.data);
255 return ret;
256 }
257
258 static struct ctl_table ipv4_table[] = {
259 {
260 .procname = "tcp_timestamps",
261 .data = &sysctl_tcp_timestamps,
262 .maxlen = sizeof(int),
263 .mode = 0644,
264 .proc_handler = proc_dointvec
265 },
266 {
267 .procname = "tcp_window_scaling",
268 .data = &sysctl_tcp_window_scaling,
269 .maxlen = sizeof(int),
270 .mode = 0644,
271 .proc_handler = proc_dointvec
272 },
273 {
274 .procname = "tcp_sack",
275 .data = &sysctl_tcp_sack,
276 .maxlen = sizeof(int),
277 .mode = 0644,
278 .proc_handler = proc_dointvec
279 },
280 {
281 .procname = "tcp_retrans_collapse",
282 .data = &sysctl_tcp_retrans_collapse,
283 .maxlen = sizeof(int),
284 .mode = 0644,
285 .proc_handler = proc_dointvec
286 },
287 {
288 .procname = "ip_default_ttl",
289 .data = &sysctl_ip_default_ttl,
290 .maxlen = sizeof(int),
291 .mode = 0644,
292 .proc_handler = proc_dointvec_minmax,
293 .extra1 = &ip_ttl_min,
294 .extra2 = &ip_ttl_max,
295 },
296 {
297 .procname = "tcp_syn_retries",
298 .data = &sysctl_tcp_syn_retries,
299 .maxlen = sizeof(int),
300 .mode = 0644,
301 .proc_handler = proc_dointvec_minmax,
302 .extra1 = &tcp_syn_retries_min,
303 .extra2 = &tcp_syn_retries_max
304 },
305 {
306 .procname = "tcp_synack_retries",
307 .data = &sysctl_tcp_synack_retries,
308 .maxlen = sizeof(int),
309 .mode = 0644,
310 .proc_handler = proc_dointvec
311 },
312 {
313 .procname = "tcp_max_orphans",
314 .data = &sysctl_tcp_max_orphans,
315 .maxlen = sizeof(int),
316 .mode = 0644,
317 .proc_handler = proc_dointvec
318 },
319 {
320 .procname = "tcp_max_tw_buckets",
321 .data = &tcp_death_row.sysctl_max_tw_buckets,
322 .maxlen = sizeof(int),
323 .mode = 0644,
324 .proc_handler = proc_dointvec
325 },
326 {
327 .procname = "ip_early_demux",
328 .data = &sysctl_ip_early_demux,
329 .maxlen = sizeof(int),
330 .mode = 0644,
331 .proc_handler = proc_dointvec
332 },
333 {
334 .procname = "ip_dynaddr",
335 .data = &sysctl_ip_dynaddr,
336 .maxlen = sizeof(int),
337 .mode = 0644,
338 .proc_handler = proc_dointvec
339 },
340 {
341 .procname = "tcp_keepalive_time",
342 .data = &sysctl_tcp_keepalive_time,
343 .maxlen = sizeof(int),
344 .mode = 0644,
345 .proc_handler = proc_dointvec_jiffies,
346 },
347 {
348 .procname = "tcp_keepalive_probes",
349 .data = &sysctl_tcp_keepalive_probes,
350 .maxlen = sizeof(int),
351 .mode = 0644,
352 .proc_handler = proc_dointvec
353 },
354 {
355 .procname = "tcp_keepalive_intvl",
356 .data = &sysctl_tcp_keepalive_intvl,
357 .maxlen = sizeof(int),
358 .mode = 0644,
359 .proc_handler = proc_dointvec_jiffies,
360 },
361 {
362 .procname = "tcp_retries1",
363 .data = &sysctl_tcp_retries1,
364 .maxlen = sizeof(int),
365 .mode = 0644,
366 .proc_handler = proc_dointvec_minmax,
367 .extra2 = &tcp_retr1_max
368 },
369 {
370 .procname = "tcp_retries2",
371 .data = &sysctl_tcp_retries2,
372 .maxlen = sizeof(int),
373 .mode = 0644,
374 .proc_handler = proc_dointvec
375 },
376 {
377 .procname = "tcp_fin_timeout",
378 .data = &sysctl_tcp_fin_timeout,
379 .maxlen = sizeof(int),
380 .mode = 0644,
381 .proc_handler = proc_dointvec_jiffies,
382 },
383 #ifdef CONFIG_SYN_COOKIES
384 {
385 .procname = "tcp_syncookies",
386 .data = &sysctl_tcp_syncookies,
387 .maxlen = sizeof(int),
388 .mode = 0644,
389 .proc_handler = proc_dointvec
390 },
391 #endif
392 {
393 .procname = "tcp_fastopen",
394 .data = &sysctl_tcp_fastopen,
395 .maxlen = sizeof(int),
396 .mode = 0644,
397 .proc_handler = proc_dointvec,
398 },
399 {
400 .procname = "tcp_fastopen_key",
401 .mode = 0600,
402 .maxlen = ((TCP_FASTOPEN_KEY_LENGTH * 2) + 10),
403 .proc_handler = proc_tcp_fastopen_key,
404 },
405 {
406 .procname = "tcp_tw_recycle",
407 .data = &tcp_death_row.sysctl_tw_recycle,
408 .maxlen = sizeof(int),
409 .mode = 0644,
410 .proc_handler = proc_dointvec
411 },
412 {
413 .procname = "tcp_abort_on_overflow",
414 .data = &sysctl_tcp_abort_on_overflow,
415 .maxlen = sizeof(int),
416 .mode = 0644,
417 .proc_handler = proc_dointvec
418 },
419 {
420 .procname = "tcp_stdurg",
421 .data = &sysctl_tcp_stdurg,
422 .maxlen = sizeof(int),
423 .mode = 0644,
424 .proc_handler = proc_dointvec
425 },
426 {
427 .procname = "tcp_rfc1337",
428 .data = &sysctl_tcp_rfc1337,
429 .maxlen = sizeof(int),
430 .mode = 0644,
431 .proc_handler = proc_dointvec
432 },
433 {
434 .procname = "tcp_max_syn_backlog",
435 .data = &sysctl_max_syn_backlog,
436 .maxlen = sizeof(int),
437 .mode = 0644,
438 .proc_handler = proc_dointvec
439 },
440 {
441 .procname = "igmp_max_memberships",
442 .data = &sysctl_igmp_max_memberships,
443 .maxlen = sizeof(int),
444 .mode = 0644,
445 .proc_handler = proc_dointvec
446 },
447 {
448 .procname = "igmp_max_msf",
449 .data = &sysctl_igmp_max_msf,
450 .maxlen = sizeof(int),
451 .mode = 0644,
452 .proc_handler = proc_dointvec
453 },
454 #ifdef CONFIG_IP_MULTICAST
455 {
456 .procname = "igmp_qrv",
457 .data = &sysctl_igmp_qrv,
458 .maxlen = sizeof(int),
459 .mode = 0644,
460 .proc_handler = proc_dointvec_minmax,
461 .extra1 = &one
462 },
463 #endif
464 {
465 .procname = "inet_peer_threshold",
466 .data = &inet_peer_threshold,
467 .maxlen = sizeof(int),
468 .mode = 0644,
469 .proc_handler = proc_dointvec
470 },
471 {
472 .procname = "inet_peer_minttl",
473 .data = &inet_peer_minttl,
474 .maxlen = sizeof(int),
475 .mode = 0644,
476 .proc_handler = proc_dointvec_jiffies,
477 },
478 {
479 .procname = "inet_peer_maxttl",
480 .data = &inet_peer_maxttl,
481 .maxlen = sizeof(int),
482 .mode = 0644,
483 .proc_handler = proc_dointvec_jiffies,
484 },
485 {
486 .procname = "tcp_orphan_retries",
487 .data = &sysctl_tcp_orphan_retries,
488 .maxlen = sizeof(int),
489 .mode = 0644,
490 .proc_handler = proc_dointvec
491 },
492 {
493 .procname = "tcp_fack",
494 .data = &sysctl_tcp_fack,
495 .maxlen = sizeof(int),
496 .mode = 0644,
497 .proc_handler = proc_dointvec
498 },
499 {
500 .procname = "tcp_reordering",
501 .data = &sysctl_tcp_reordering,
502 .maxlen = sizeof(int),
503 .mode = 0644,
504 .proc_handler = proc_dointvec
505 },
506 {
507 .procname = "tcp_max_reordering",
508 .data = &sysctl_tcp_max_reordering,
509 .maxlen = sizeof(int),
510 .mode = 0644,
511 .proc_handler = proc_dointvec
512 },
513 {
514 .procname = "tcp_dsack",
515 .data = &sysctl_tcp_dsack,
516 .maxlen = sizeof(int),
517 .mode = 0644,
518 .proc_handler = proc_dointvec
519 },
520 {
521 .procname = "tcp_mem",
522 .maxlen = sizeof(sysctl_tcp_mem),
523 .data = &sysctl_tcp_mem,
524 .mode = 0644,
525 .proc_handler = proc_doulongvec_minmax,
526 },
527 {
528 .procname = "tcp_wmem",
529 .data = &sysctl_tcp_wmem,
530 .maxlen = sizeof(sysctl_tcp_wmem),
531 .mode = 0644,
532 .proc_handler = proc_dointvec_minmax,
533 .extra1 = &min_sndbuf,
534 },
535 {
536 .procname = "tcp_notsent_lowat",
537 .data = &sysctl_tcp_notsent_lowat,
538 .maxlen = sizeof(sysctl_tcp_notsent_lowat),
539 .mode = 0644,
540 .proc_handler = proc_dointvec,
541 },
542 {
543 .procname = "tcp_rmem",
544 .data = &sysctl_tcp_rmem,
545 .maxlen = sizeof(sysctl_tcp_rmem),
546 .mode = 0644,
547 .proc_handler = proc_dointvec_minmax,
548 .extra1 = &min_rcvbuf,
549 },
550 {
551 .procname = "tcp_app_win",
552 .data = &sysctl_tcp_app_win,
553 .maxlen = sizeof(int),
554 .mode = 0644,
555 .proc_handler = proc_dointvec
556 },
557 {
558 .procname = "tcp_adv_win_scale",
559 .data = &sysctl_tcp_adv_win_scale,
560 .maxlen = sizeof(int),
561 .mode = 0644,
562 .proc_handler = proc_dointvec_minmax,
563 .extra1 = &tcp_adv_win_scale_min,
564 .extra2 = &tcp_adv_win_scale_max,
565 },
566 {
567 .procname = "tcp_tw_reuse",
568 .data = &sysctl_tcp_tw_reuse,
569 .maxlen = sizeof(int),
570 .mode = 0644,
571 .proc_handler = proc_dointvec
572 },
573 {
574 .procname = "tcp_frto",
575 .data = &sysctl_tcp_frto,
576 .maxlen = sizeof(int),
577 .mode = 0644,
578 .proc_handler = proc_dointvec
579 },
580 {
581 .procname = "tcp_low_latency",
582 .data = &sysctl_tcp_low_latency,
583 .maxlen = sizeof(int),
584 .mode = 0644,
585 .proc_handler = proc_dointvec
586 },
587 {
588 .procname = "tcp_no_metrics_save",
589 .data = &sysctl_tcp_nometrics_save,
590 .maxlen = sizeof(int),
591 .mode = 0644,
592 .proc_handler = proc_dointvec,
593 },
594 {
595 .procname = "tcp_moderate_rcvbuf",
596 .data = &sysctl_tcp_moderate_rcvbuf,
597 .maxlen = sizeof(int),
598 .mode = 0644,
599 .proc_handler = proc_dointvec,
600 },
601 {
602 .procname = "tcp_tso_win_divisor",
603 .data = &sysctl_tcp_tso_win_divisor,
604 .maxlen = sizeof(int),
605 .mode = 0644,
606 .proc_handler = proc_dointvec,
607 },
608 {
609 .procname = "tcp_congestion_control",
610 .mode = 0644,
611 .maxlen = TCP_CA_NAME_MAX,
612 .proc_handler = proc_tcp_congestion_control,
613 },
614 {
615 .procname = "tcp_workaround_signed_windows",
616 .data = &sysctl_tcp_workaround_signed_windows,
617 .maxlen = sizeof(int),
618 .mode = 0644,
619 .proc_handler = proc_dointvec
620 },
621 {
622 .procname = "tcp_limit_output_bytes",
623 .data = &sysctl_tcp_limit_output_bytes,
624 .maxlen = sizeof(int),
625 .mode = 0644,
626 .proc_handler = proc_dointvec
627 },
628 {
629 .procname = "tcp_challenge_ack_limit",
630 .data = &sysctl_tcp_challenge_ack_limit,
631 .maxlen = sizeof(int),
632 .mode = 0644,
633 .proc_handler = proc_dointvec
634 },
635 {
636 .procname = "tcp_slow_start_after_idle",
637 .data = &sysctl_tcp_slow_start_after_idle,
638 .maxlen = sizeof(int),
639 .mode = 0644,
640 .proc_handler = proc_dointvec
641 },
642 #ifdef CONFIG_NETLABEL
643 {
644 .procname = "cipso_cache_enable",
645 .data = &cipso_v4_cache_enabled,
646 .maxlen = sizeof(int),
647 .mode = 0644,
648 .proc_handler = proc_dointvec,
649 },
650 {
651 .procname = "cipso_cache_bucket_size",
652 .data = &cipso_v4_cache_bucketsize,
653 .maxlen = sizeof(int),
654 .mode = 0644,
655 .proc_handler = proc_dointvec,
656 },
657 {
658 .procname = "cipso_rbm_optfmt",
659 .data = &cipso_v4_rbm_optfmt,
660 .maxlen = sizeof(int),
661 .mode = 0644,
662 .proc_handler = proc_dointvec,
663 },
664 {
665 .procname = "cipso_rbm_strictvalid",
666 .data = &cipso_v4_rbm_strictvalid,
667 .maxlen = sizeof(int),
668 .mode = 0644,
669 .proc_handler = proc_dointvec,
670 },
671 #endif /* CONFIG_NETLABEL */
672 {
673 .procname = "tcp_available_congestion_control",
674 .maxlen = TCP_CA_BUF_MAX,
675 .mode = 0444,
676 .proc_handler = proc_tcp_available_congestion_control,
677 },
678 {
679 .procname = "tcp_allowed_congestion_control",
680 .maxlen = TCP_CA_BUF_MAX,
681 .mode = 0644,
682 .proc_handler = proc_allowed_congestion_control,
683 },
684 {
685 .procname = "tcp_thin_linear_timeouts",
686 .data = &sysctl_tcp_thin_linear_timeouts,
687 .maxlen = sizeof(int),
688 .mode = 0644,
689 .proc_handler = proc_dointvec
690 },
691 {
692 .procname = "tcp_thin_dupack",
693 .data = &sysctl_tcp_thin_dupack,
694 .maxlen = sizeof(int),
695 .mode = 0644,
696 .proc_handler = proc_dointvec
697 },
698 {
699 .procname = "tcp_early_retrans",
700 .data = &sysctl_tcp_early_retrans,
701 .maxlen = sizeof(int),
702 .mode = 0644,
703 .proc_handler = proc_dointvec_minmax,
704 .extra1 = &zero,
705 .extra2 = &four,
706 },
707 {
708 .procname = "tcp_min_tso_segs",
709 .data = &sysctl_tcp_min_tso_segs,
710 .maxlen = sizeof(int),
711 .mode = 0644,
712 .proc_handler = proc_dointvec_minmax,
713 .extra1 = &one,
714 .extra2 = &gso_max_segs,
715 },
716 {
717 .procname = "tcp_autocorking",
718 .data = &sysctl_tcp_autocorking,
719 .maxlen = sizeof(int),
720 .mode = 0644,
721 .proc_handler = proc_dointvec_minmax,
722 .extra1 = &zero,
723 .extra2 = &one,
724 },
725 {
726 .procname = "tcp_invalid_ratelimit",
727 .data = &sysctl_tcp_invalid_ratelimit,
728 .maxlen = sizeof(int),
729 .mode = 0644,
730 .proc_handler = proc_dointvec_ms_jiffies,
731 },
732 {
733 .procname = "icmp_msgs_per_sec",
734 .data = &sysctl_icmp_msgs_per_sec,
735 .maxlen = sizeof(int),
736 .mode = 0644,
737 .proc_handler = proc_dointvec_minmax,
738 .extra1 = &zero,
739 },
740 {
741 .procname = "icmp_msgs_burst",
742 .data = &sysctl_icmp_msgs_burst,
743 .maxlen = sizeof(int),
744 .mode = 0644,
745 .proc_handler = proc_dointvec_minmax,
746 .extra1 = &zero,
747 },
748 {
749 .procname = "udp_mem",
750 .data = &sysctl_udp_mem,
751 .maxlen = sizeof(sysctl_udp_mem),
752 .mode = 0644,
753 .proc_handler = proc_doulongvec_minmax,
754 },
755 {
756 .procname = "udp_rmem_min",
757 .data = &sysctl_udp_rmem_min,
758 .maxlen = sizeof(sysctl_udp_rmem_min),
759 .mode = 0644,
760 .proc_handler = proc_dointvec_minmax,
761 .extra1 = &min_rcvbuf,
762 },
763 {
764 .procname = "udp_wmem_min",
765 .data = &sysctl_udp_wmem_min,
766 .maxlen = sizeof(sysctl_udp_wmem_min),
767 .mode = 0644,
768 .proc_handler = proc_dointvec_minmax,
769 .extra1 = &min_sndbuf,
770 },
771 { }
772 };
773
774 static struct ctl_table ipv4_net_table[] = {
775 {
776 .procname = "icmp_echo_ignore_all",
777 .data = &init_net.ipv4.sysctl_icmp_echo_ignore_all,
778 .maxlen = sizeof(int),
779 .mode = 0644,
780 .proc_handler = proc_dointvec
781 },
782 {
783 .procname = "icmp_echo_ignore_broadcasts",
784 .data = &init_net.ipv4.sysctl_icmp_echo_ignore_broadcasts,
785 .maxlen = sizeof(int),
786 .mode = 0644,
787 .proc_handler = proc_dointvec
788 },
789 {
790 .procname = "icmp_ignore_bogus_error_responses",
791 .data = &init_net.ipv4.sysctl_icmp_ignore_bogus_error_responses,
792 .maxlen = sizeof(int),
793 .mode = 0644,
794 .proc_handler = proc_dointvec
795 },
796 {
797 .procname = "icmp_errors_use_inbound_ifaddr",
798 .data = &init_net.ipv4.sysctl_icmp_errors_use_inbound_ifaddr,
799 .maxlen = sizeof(int),
800 .mode = 0644,
801 .proc_handler = proc_dointvec
802 },
803 {
804 .procname = "icmp_ratelimit",
805 .data = &init_net.ipv4.sysctl_icmp_ratelimit,
806 .maxlen = sizeof(int),
807 .mode = 0644,
808 .proc_handler = proc_dointvec_ms_jiffies,
809 },
810 {
811 .procname = "icmp_ratemask",
812 .data = &init_net.ipv4.sysctl_icmp_ratemask,
813 .maxlen = sizeof(int),
814 .mode = 0644,
815 .proc_handler = proc_dointvec
816 },
817 {
818 .procname = "ping_group_range",
819 .data = &init_net.ipv4.ping_group_range.range,
820 .maxlen = sizeof(gid_t)*2,
821 .mode = 0644,
822 .proc_handler = ipv4_ping_group_range,
823 },
824 {
825 .procname = "tcp_ecn",
826 .data = &init_net.ipv4.sysctl_tcp_ecn,
827 .maxlen = sizeof(int),
828 .mode = 0644,
829 .proc_handler = proc_dointvec
830 },
831 {
832 .procname = "tcp_ecn_fallback",
833 .data = &init_net.ipv4.sysctl_tcp_ecn_fallback,
834 .maxlen = sizeof(int),
835 .mode = 0644,
836 .proc_handler = proc_dointvec
837 },
838 {
839 .procname = "ip_local_port_range",
840 .maxlen = sizeof(init_net.ipv4.ip_local_ports.range),
841 .data = &init_net.ipv4.ip_local_ports.range,
842 .mode = 0644,
843 .proc_handler = ipv4_local_port_range,
844 },
845 {
846 .procname = "ip_local_reserved_ports",
847 .data = &init_net.ipv4.sysctl_local_reserved_ports,
848 .maxlen = 65536,
849 .mode = 0644,
850 .proc_handler = proc_do_large_bitmap,
851 },
852 {
853 .procname = "ip_no_pmtu_disc",
854 .data = &init_net.ipv4.sysctl_ip_no_pmtu_disc,
855 .maxlen = sizeof(int),
856 .mode = 0644,
857 .proc_handler = proc_dointvec
858 },
859 {
860 .procname = "ip_forward_use_pmtu",
861 .data = &init_net.ipv4.sysctl_ip_fwd_use_pmtu,
862 .maxlen = sizeof(int),
863 .mode = 0644,
864 .proc_handler = proc_dointvec,
865 },
866 {
867 .procname = "ip_nonlocal_bind",
868 .data = &init_net.ipv4.sysctl_ip_nonlocal_bind,
869 .maxlen = sizeof(int),
870 .mode = 0644,
871 .proc_handler = proc_dointvec
872 },
873 {
874 .procname = "fwmark_reflect",
875 .data = &init_net.ipv4.sysctl_fwmark_reflect,
876 .maxlen = sizeof(int),
877 .mode = 0644,
878 .proc_handler = proc_dointvec,
879 },
880 {
881 .procname = "tcp_fwmark_accept",
882 .data = &init_net.ipv4.sysctl_tcp_fwmark_accept,
883 .maxlen = sizeof(int),
884 .mode = 0644,
885 .proc_handler = proc_dointvec,
886 },
887 {
888 .procname = "tcp_mtu_probing",
889 .data = &init_net.ipv4.sysctl_tcp_mtu_probing,
890 .maxlen = sizeof(int),
891 .mode = 0644,
892 .proc_handler = proc_dointvec,
893 },
894 {
895 .procname = "tcp_base_mss",
896 .data = &init_net.ipv4.sysctl_tcp_base_mss,
897 .maxlen = sizeof(int),
898 .mode = 0644,
899 .proc_handler = proc_dointvec,
900 },
901 {
902 .procname = "tcp_probe_threshold",
903 .data = &init_net.ipv4.sysctl_tcp_probe_threshold,
904 .maxlen = sizeof(int),
905 .mode = 0644,
906 .proc_handler = proc_dointvec,
907 },
908 {
909 .procname = "tcp_probe_interval",
910 .data = &init_net.ipv4.sysctl_tcp_probe_interval,
911 .maxlen = sizeof(int),
912 .mode = 0644,
913 .proc_handler = proc_dointvec,
914 },
915 { }
916 };
917
918 static __net_init int ipv4_sysctl_init_net(struct net *net)
919 {
920 struct ctl_table *table;
921
922 table = ipv4_net_table;
923 if (!net_eq(net, &init_net)) {
924 int i;
925
926 table = kmemdup(table, sizeof(ipv4_net_table), GFP_KERNEL);
927 if (!table)
928 goto err_alloc;
929
930 /* Update the variables to point into the current struct net */
931 for (i = 0; i < ARRAY_SIZE(ipv4_net_table) - 1; i++)
932 table[i].data += (void *)net - (void *)&init_net;
933 }
934
935 net->ipv4.ipv4_hdr = register_net_sysctl(net, "net/ipv4", table);
936 if (!net->ipv4.ipv4_hdr)
937 goto err_reg;
938
939 net->ipv4.sysctl_local_reserved_ports = kzalloc(65536 / 8, GFP_KERNEL);
940 if (!net->ipv4.sysctl_local_reserved_ports)
941 goto err_ports;
942
943 return 0;
944
945 err_ports:
946 unregister_net_sysctl_table(net->ipv4.ipv4_hdr);
947 err_reg:
948 if (!net_eq(net, &init_net))
949 kfree(table);
950 err_alloc:
951 return -ENOMEM;
952 }
953
954 static __net_exit void ipv4_sysctl_exit_net(struct net *net)
955 {
956 struct ctl_table *table;
957
958 kfree(net->ipv4.sysctl_local_reserved_ports);
959 table = net->ipv4.ipv4_hdr->ctl_table_arg;
960 unregister_net_sysctl_table(net->ipv4.ipv4_hdr);
961 kfree(table);
962 }
963
964 static __net_initdata struct pernet_operations ipv4_sysctl_ops = {
965 .init = ipv4_sysctl_init_net,
966 .exit = ipv4_sysctl_exit_net,
967 };
968
969 static __init int sysctl_ipv4_init(void)
970 {
971 struct ctl_table_header *hdr;
972
973 hdr = register_net_sysctl(&init_net, "net/ipv4", ipv4_table);
974 if (!hdr)
975 return -ENOMEM;
976
977 if (register_pernet_subsys(&ipv4_sysctl_ops)) {
978 unregister_net_sysctl_table(hdr);
979 return -ENOMEM;
980 }
981
982 return 0;
983 }
984
985 __initcall(sysctl_ipv4_init);
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