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Merge tag 'regmap-v3.10-rc4' of git://git.kernel.org/pub/scm/linux/kernel/git/broonie...
[linux-2.6.git] / net / ipv4 / sysctl_net_ipv4.c
blobfa2f63fc453b936b1660b79146b67edf17ae687a
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 tcp_retr1_max = 255;
33 static int ip_local_port_range_min[] = { 1, 1 };
34 static int ip_local_port_range_max[] = { 65535, 65535 };
35 static int tcp_adv_win_scale_min = -31;
36 static int tcp_adv_win_scale_max = 31;
37 static int ip_ttl_min = 1;
38 static int ip_ttl_max = 255;
39 static int ip_ping_group_range_min[] = { 0, 0 };
40 static int ip_ping_group_range_max[] = { GID_T_MAX, GID_T_MAX };
41
42 /* Update system visible IP port range */
43 static void set_local_port_range(int range[2])
44 {
45 write_seqlock(&sysctl_local_ports.lock);
46 sysctl_local_ports.range[0] = range[0];
47 sysctl_local_ports.range[1] = range[1];
48 write_sequnlock(&sysctl_local_ports.lock);
49 }
50
51 /* Validate changes from /proc interface. */
52 static int ipv4_local_port_range(ctl_table *table, int write,
53 void __user *buffer,
54 size_t *lenp, loff_t *ppos)
55 {
56 int ret;
57 int range[2];
58 ctl_table tmp = {
59 .data = &range,
60 .maxlen = sizeof(range),
61 .mode = table->mode,
62 .extra1 = &ip_local_port_range_min,
63 .extra2 = &ip_local_port_range_max,
64 };
65
66 inet_get_local_port_range(range, range + 1);
67 ret = proc_dointvec_minmax(&tmp, write, buffer, lenp, ppos);
68
69 if (write && ret == 0) {
70 if (range[1] < range[0])
71 ret = -EINVAL;
72 else
73 set_local_port_range(range);
74 }
75
76 return ret;
77 }
78
79
80 static void inet_get_ping_group_range_table(struct ctl_table *table, kgid_t *low, kgid_t *high)
81 {
82 kgid_t *data = table->data;
83 unsigned int seq;
84 do {
85 seq = read_seqbegin(&sysctl_local_ports.lock);
86
87 *low = data[0];
88 *high = data[1];
89 } while (read_seqretry(&sysctl_local_ports.lock, seq));
90 }
91
92 /* Update system visible IP port range */
93 static void set_ping_group_range(struct ctl_table *table, kgid_t low, kgid_t high)
94 {
95 kgid_t *data = table->data;
96 write_seqlock(&sysctl_local_ports.lock);
97 data[0] = low;
98 data[1] = high;
99 write_sequnlock(&sysctl_local_ports.lock);
100 }
101
102 /* Validate changes from /proc interface. */
103 static int ipv4_ping_group_range(ctl_table *table, int write,
104 void __user *buffer,
105 size_t *lenp, loff_t *ppos)
106 {
107 struct user_namespace *user_ns = current_user_ns();
108 int ret;
109 gid_t urange[2];
110 kgid_t low, high;
111 ctl_table tmp = {
112 .data = &urange,
113 .maxlen = sizeof(urange),
114 .mode = table->mode,
115 .extra1 = &ip_ping_group_range_min,
116 .extra2 = &ip_ping_group_range_max,
117 };
118
119 inet_get_ping_group_range_table(table, &low, &high);
120 urange[0] = from_kgid_munged(user_ns, low);
121 urange[1] = from_kgid_munged(user_ns, high);
122 ret = proc_dointvec_minmax(&tmp, write, buffer, lenp, ppos);
123
124 if (write && ret == 0) {
125 low = make_kgid(user_ns, urange[0]);
126 high = make_kgid(user_ns, urange[1]);
127 if (!gid_valid(low) || !gid_valid(high) ||
128 (urange[1] < urange[0]) || gid_lt(high, low)) {
129 low = make_kgid(&init_user_ns, 1);
130 high = make_kgid(&init_user_ns, 0);
131 }
132 set_ping_group_range(table, low, high);
133 }
134
135 return ret;
136 }
137
138 static int proc_tcp_congestion_control(ctl_table *ctl, int write,
139 void __user *buffer, size_t *lenp, loff_t *ppos)
140 {
141 char val[TCP_CA_NAME_MAX];
142 ctl_table tbl = {
143 .data = val,
144 .maxlen = TCP_CA_NAME_MAX,
145 };
146 int ret;
147
148 tcp_get_default_congestion_control(val);
149
150 ret = proc_dostring(&tbl, write, buffer, lenp, ppos);
151 if (write && ret == 0)
152 ret = tcp_set_default_congestion_control(val);
153 return ret;
154 }
155
156 static int proc_tcp_available_congestion_control(ctl_table *ctl,
157 int write,
158 void __user *buffer, size_t *lenp,
159 loff_t *ppos)
160 {
161 ctl_table tbl = { .maxlen = TCP_CA_BUF_MAX, };
162 int ret;
163
164 tbl.data = kmalloc(tbl.maxlen, GFP_USER);
165 if (!tbl.data)
166 return -ENOMEM;
167 tcp_get_available_congestion_control(tbl.data, TCP_CA_BUF_MAX);
168 ret = proc_dostring(&tbl, write, buffer, lenp, ppos);
169 kfree(tbl.data);
170 return ret;
171 }
172
173 static int proc_allowed_congestion_control(ctl_table *ctl,
174 int write,
175 void __user *buffer, size_t *lenp,
176 loff_t *ppos)
177 {
178 ctl_table tbl = { .maxlen = TCP_CA_BUF_MAX };
179 int ret;
180
181 tbl.data = kmalloc(tbl.maxlen, GFP_USER);
182 if (!tbl.data)
183 return -ENOMEM;
184
185 tcp_get_allowed_congestion_control(tbl.data, tbl.maxlen);
186 ret = proc_dostring(&tbl, write, buffer, lenp, ppos);
187 if (write && ret == 0)
188 ret = tcp_set_allowed_congestion_control(tbl.data);
189 kfree(tbl.data);
190 return ret;
191 }
192
193 static int ipv4_tcp_mem(ctl_table *ctl, int write,
194 void __user *buffer, size_t *lenp,
195 loff_t *ppos)
196 {
197 int ret;
198 unsigned long vec[3];
199 struct net *net = current->nsproxy->net_ns;
200 #ifdef CONFIG_MEMCG_KMEM
201 struct mem_cgroup *memcg;
202 #endif
203
204 ctl_table tmp = {
205 .data = &vec,
206 .maxlen = sizeof(vec),
207 .mode = ctl->mode,
208 };
209
210 if (!write) {
211 ctl->data = &net->ipv4.sysctl_tcp_mem;
212 return proc_doulongvec_minmax(ctl, write, buffer, lenp, ppos);
213 }
214
215 ret = proc_doulongvec_minmax(&tmp, write, buffer, lenp, ppos);
216 if (ret)
217 return ret;
218
219 #ifdef CONFIG_MEMCG_KMEM
220 rcu_read_lock();
221 memcg = mem_cgroup_from_task(current);
222
223 tcp_prot_mem(memcg, vec[0], 0);
224 tcp_prot_mem(memcg, vec[1], 1);
225 tcp_prot_mem(memcg, vec[2], 2);
226 rcu_read_unlock();
227 #endif
228
229 net->ipv4.sysctl_tcp_mem[0] = vec[0];
230 net->ipv4.sysctl_tcp_mem[1] = vec[1];
231 net->ipv4.sysctl_tcp_mem[2] = vec[2];
232
233 return 0;
234 }
235
236 static int proc_tcp_fastopen_key(ctl_table *ctl, int write, void __user *buffer,
237 size_t *lenp, loff_t *ppos)
238 {
239 ctl_table tbl = { .maxlen = (TCP_FASTOPEN_KEY_LENGTH * 2 + 10) };
240 struct tcp_fastopen_context *ctxt;
241 int ret;
242 u32 user_key[4]; /* 16 bytes, matching TCP_FASTOPEN_KEY_LENGTH */
243
244 tbl.data = kmalloc(tbl.maxlen, GFP_KERNEL);
245 if (!tbl.data)
246 return -ENOMEM;
247
248 rcu_read_lock();
249 ctxt = rcu_dereference(tcp_fastopen_ctx);
250 if (ctxt)
251 memcpy(user_key, ctxt->key, TCP_FASTOPEN_KEY_LENGTH);
252 else
253 memset(user_key, 0, sizeof(user_key));
254 rcu_read_unlock();
255
256 snprintf(tbl.data, tbl.maxlen, "%08x-%08x-%08x-%08x",
257 user_key[0], user_key[1], user_key[2], user_key[3]);
258 ret = proc_dostring(&tbl, write, buffer, lenp, ppos);
259
260 if (write && ret == 0) {
261 if (sscanf(tbl.data, "%x-%x-%x-%x", user_key, user_key + 1,
262 user_key + 2, user_key + 3) != 4) {
263 ret = -EINVAL;
264 goto bad_key;
265 }
266 tcp_fastopen_reset_cipher(user_key, TCP_FASTOPEN_KEY_LENGTH);
267 }
268
269 bad_key:
270 pr_debug("proc FO key set 0x%x-%x-%x-%x <- 0x%s: %u\n",
271 user_key[0], user_key[1], user_key[2], user_key[3],
272 (char *)tbl.data, ret);
273 kfree(tbl.data);
274 return ret;
275 }
276
277 static struct ctl_table ipv4_table[] = {
278 {
279 .procname = "tcp_timestamps",
280 .data = &sysctl_tcp_timestamps,
281 .maxlen = sizeof(int),
282 .mode = 0644,
283 .proc_handler = proc_dointvec
284 },
285 {
286 .procname = "tcp_window_scaling",
287 .data = &sysctl_tcp_window_scaling,
288 .maxlen = sizeof(int),
289 .mode = 0644,
290 .proc_handler = proc_dointvec
291 },
292 {
293 .procname = "tcp_sack",
294 .data = &sysctl_tcp_sack,
295 .maxlen = sizeof(int),
296 .mode = 0644,
297 .proc_handler = proc_dointvec
298 },
299 {
300 .procname = "tcp_retrans_collapse",
301 .data = &sysctl_tcp_retrans_collapse,
302 .maxlen = sizeof(int),
303 .mode = 0644,
304 .proc_handler = proc_dointvec
305 },
306 {
307 .procname = "ip_default_ttl",
308 .data = &sysctl_ip_default_ttl,
309 .maxlen = sizeof(int),
310 .mode = 0644,
311 .proc_handler = proc_dointvec_minmax,
312 .extra1 = &ip_ttl_min,
313 .extra2 = &ip_ttl_max,
314 },
315 {
316 .procname = "ip_no_pmtu_disc",
317 .data = &ipv4_config.no_pmtu_disc,
318 .maxlen = sizeof(int),
319 .mode = 0644,
320 .proc_handler = proc_dointvec
321 },
322 {
323 .procname = "ip_nonlocal_bind",
324 .data = &sysctl_ip_nonlocal_bind,
325 .maxlen = sizeof(int),
326 .mode = 0644,
327 .proc_handler = proc_dointvec
328 },
329 {
330 .procname = "tcp_syn_retries",
331 .data = &sysctl_tcp_syn_retries,
332 .maxlen = sizeof(int),
333 .mode = 0644,
334 .proc_handler = proc_dointvec
335 },
336 {
337 .procname = "tcp_synack_retries",
338 .data = &sysctl_tcp_synack_retries,
339 .maxlen = sizeof(int),
340 .mode = 0644,
341 .proc_handler = proc_dointvec
342 },
343 {
344 .procname = "tcp_max_orphans",
345 .data = &sysctl_tcp_max_orphans,
346 .maxlen = sizeof(int),
347 .mode = 0644,
348 .proc_handler = proc_dointvec
349 },
350 {
351 .procname = "tcp_max_tw_buckets",
352 .data = &tcp_death_row.sysctl_max_tw_buckets,
353 .maxlen = sizeof(int),
354 .mode = 0644,
355 .proc_handler = proc_dointvec
356 },
357 {
358 .procname = "ip_early_demux",
359 .data = &sysctl_ip_early_demux,
360 .maxlen = sizeof(int),
361 .mode = 0644,
362 .proc_handler = proc_dointvec
363 },
364 {
365 .procname = "ip_dynaddr",
366 .data = &sysctl_ip_dynaddr,
367 .maxlen = sizeof(int),
368 .mode = 0644,
369 .proc_handler = proc_dointvec
370 },
371 {
372 .procname = "tcp_keepalive_time",
373 .data = &sysctl_tcp_keepalive_time,
374 .maxlen = sizeof(int),
375 .mode = 0644,
376 .proc_handler = proc_dointvec_jiffies,
377 },
378 {
379 .procname = "tcp_keepalive_probes",
380 .data = &sysctl_tcp_keepalive_probes,
381 .maxlen = sizeof(int),
382 .mode = 0644,
383 .proc_handler = proc_dointvec
384 },
385 {
386 .procname = "tcp_keepalive_intvl",
387 .data = &sysctl_tcp_keepalive_intvl,
388 .maxlen = sizeof(int),
389 .mode = 0644,
390 .proc_handler = proc_dointvec_jiffies,
391 },
392 {
393 .procname = "tcp_retries1",
394 .data = &sysctl_tcp_retries1,
395 .maxlen = sizeof(int),
396 .mode = 0644,
397 .proc_handler = proc_dointvec_minmax,
398 .extra2 = &tcp_retr1_max
399 },
400 {
401 .procname = "tcp_retries2",
402 .data = &sysctl_tcp_retries2,
403 .maxlen = sizeof(int),
404 .mode = 0644,
405 .proc_handler = proc_dointvec
406 },
407 {
408 .procname = "tcp_fin_timeout",
409 .data = &sysctl_tcp_fin_timeout,
410 .maxlen = sizeof(int),
411 .mode = 0644,
412 .proc_handler = proc_dointvec_jiffies,
413 },
414 #ifdef CONFIG_SYN_COOKIES
415 {
416 .procname = "tcp_syncookies",
417 .data = &sysctl_tcp_syncookies,
418 .maxlen = sizeof(int),
419 .mode = 0644,
420 .proc_handler = proc_dointvec
421 },
422 #endif
423 {
424 .procname = "tcp_fastopen",
425 .data = &sysctl_tcp_fastopen,
426 .maxlen = sizeof(int),
427 .mode = 0644,
428 .proc_handler = proc_dointvec,
429 },
430 {
431 .procname = "tcp_fastopen_key",
432 .mode = 0600,
433 .maxlen = ((TCP_FASTOPEN_KEY_LENGTH * 2) + 10),
434 .proc_handler = proc_tcp_fastopen_key,
435 },
436 {
437 .procname = "tcp_tw_recycle",
438 .data = &tcp_death_row.sysctl_tw_recycle,
439 .maxlen = sizeof(int),
440 .mode = 0644,
441 .proc_handler = proc_dointvec
442 },
443 {
444 .procname = "tcp_abort_on_overflow",
445 .data = &sysctl_tcp_abort_on_overflow,
446 .maxlen = sizeof(int),
447 .mode = 0644,
448 .proc_handler = proc_dointvec
449 },
450 {
451 .procname = "tcp_stdurg",
452 .data = &sysctl_tcp_stdurg,
453 .maxlen = sizeof(int),
454 .mode = 0644,
455 .proc_handler = proc_dointvec
456 },
457 {
458 .procname = "tcp_rfc1337",
459 .data = &sysctl_tcp_rfc1337,
460 .maxlen = sizeof(int),
461 .mode = 0644,
462 .proc_handler = proc_dointvec
463 },
464 {
465 .procname = "tcp_max_syn_backlog",
466 .data = &sysctl_max_syn_backlog,
467 .maxlen = sizeof(int),
468 .mode = 0644,
469 .proc_handler = proc_dointvec
470 },
471 {
472 .procname = "ip_local_port_range",
473 .data = &sysctl_local_ports.range,
474 .maxlen = sizeof(sysctl_local_ports.range),
475 .mode = 0644,
476 .proc_handler = ipv4_local_port_range,
477 },
478 {
479 .procname = "ip_local_reserved_ports",
480 .data = NULL, /* initialized in sysctl_ipv4_init */
481 .maxlen = 65536,
482 .mode = 0644,
483 .proc_handler = proc_do_large_bitmap,
484 },
485 {
486 .procname = "igmp_max_memberships",
487 .data = &sysctl_igmp_max_memberships,
488 .maxlen = sizeof(int),
489 .mode = 0644,
490 .proc_handler = proc_dointvec
491 },
492 {
493 .procname = "igmp_max_msf",
494 .data = &sysctl_igmp_max_msf,
495 .maxlen = sizeof(int),
496 .mode = 0644,
497 .proc_handler = proc_dointvec
498 },
499 {
500 .procname = "inet_peer_threshold",
501 .data = &inet_peer_threshold,
502 .maxlen = sizeof(int),
503 .mode = 0644,
504 .proc_handler = proc_dointvec
505 },
506 {
507 .procname = "inet_peer_minttl",
508 .data = &inet_peer_minttl,
509 .maxlen = sizeof(int),
510 .mode = 0644,
511 .proc_handler = proc_dointvec_jiffies,
512 },
513 {
514 .procname = "inet_peer_maxttl",
515 .data = &inet_peer_maxttl,
516 .maxlen = sizeof(int),
517 .mode = 0644,
518 .proc_handler = proc_dointvec_jiffies,
519 },
520 {
521 .procname = "tcp_orphan_retries",
522 .data = &sysctl_tcp_orphan_retries,
523 .maxlen = sizeof(int),
524 .mode = 0644,
525 .proc_handler = proc_dointvec
526 },
527 {
528 .procname = "tcp_fack",
529 .data = &sysctl_tcp_fack,
530 .maxlen = sizeof(int),
531 .mode = 0644,
532 .proc_handler = proc_dointvec
533 },
534 {
535 .procname = "tcp_reordering",
536 .data = &sysctl_tcp_reordering,
537 .maxlen = sizeof(int),
538 .mode = 0644,
539 .proc_handler = proc_dointvec
540 },
541 {
542 .procname = "tcp_dsack",
543 .data = &sysctl_tcp_dsack,
544 .maxlen = sizeof(int),
545 .mode = 0644,
546 .proc_handler = proc_dointvec
547 },
548 {
549 .procname = "tcp_wmem",
550 .data = &sysctl_tcp_wmem,
551 .maxlen = sizeof(sysctl_tcp_wmem),
552 .mode = 0644,
553 .proc_handler = proc_dointvec_minmax,
554 .extra1 = &one,
555 },
556 {
557 .procname = "tcp_rmem",
558 .data = &sysctl_tcp_rmem,
559 .maxlen = sizeof(sysctl_tcp_rmem),
560 .mode = 0644,
561 .proc_handler = proc_dointvec_minmax,
562 .extra1 = &one,
563 },
564 {
565 .procname = "tcp_app_win",
566 .data = &sysctl_tcp_app_win,
567 .maxlen = sizeof(int),
568 .mode = 0644,
569 .proc_handler = proc_dointvec
570 },
571 {
572 .procname = "tcp_adv_win_scale",
573 .data = &sysctl_tcp_adv_win_scale,
574 .maxlen = sizeof(int),
575 .mode = 0644,
576 .proc_handler = proc_dointvec_minmax,
577 .extra1 = &tcp_adv_win_scale_min,
578 .extra2 = &tcp_adv_win_scale_max,
579 },
580 {
581 .procname = "tcp_tw_reuse",
582 .data = &sysctl_tcp_tw_reuse,
583 .maxlen = sizeof(int),
584 .mode = 0644,
585 .proc_handler = proc_dointvec
586 },
587 {
588 .procname = "tcp_frto",
589 .data = &sysctl_tcp_frto,
590 .maxlen = sizeof(int),
591 .mode = 0644,
592 .proc_handler = proc_dointvec
593 },
594 {
595 .procname = "tcp_low_latency",
596 .data = &sysctl_tcp_low_latency,
597 .maxlen = sizeof(int),
598 .mode = 0644,
599 .proc_handler = proc_dointvec
600 },
601 {
602 .procname = "tcp_no_metrics_save",
603 .data = &sysctl_tcp_nometrics_save,
604 .maxlen = sizeof(int),
605 .mode = 0644,
606 .proc_handler = proc_dointvec,
607 },
608 {
609 .procname = "tcp_moderate_rcvbuf",
610 .data = &sysctl_tcp_moderate_rcvbuf,
611 .maxlen = sizeof(int),
612 .mode = 0644,
613 .proc_handler = proc_dointvec,
614 },
615 {
616 .procname = "tcp_tso_win_divisor",
617 .data = &sysctl_tcp_tso_win_divisor,
618 .maxlen = sizeof(int),
619 .mode = 0644,
620 .proc_handler = proc_dointvec,
621 },
622 {
623 .procname = "tcp_congestion_control",
624 .mode = 0644,
625 .maxlen = TCP_CA_NAME_MAX,
626 .proc_handler = proc_tcp_congestion_control,
627 },
628 {
629 .procname = "tcp_mtu_probing",
630 .data = &sysctl_tcp_mtu_probing,
631 .maxlen = sizeof(int),
632 .mode = 0644,
633 .proc_handler = proc_dointvec,
634 },
635 {
636 .procname = "tcp_base_mss",
637 .data = &sysctl_tcp_base_mss,
638 .maxlen = sizeof(int),
639 .mode = 0644,
640 .proc_handler = proc_dointvec,
641 },
642 {
643 .procname = "tcp_workaround_signed_windows",
644 .data = &sysctl_tcp_workaround_signed_windows,
645 .maxlen = sizeof(int),
646 .mode = 0644,
647 .proc_handler = proc_dointvec
648 },
649 {
650 .procname = "tcp_limit_output_bytes",
651 .data = &sysctl_tcp_limit_output_bytes,
652 .maxlen = sizeof(int),
653 .mode = 0644,
654 .proc_handler = proc_dointvec
655 },
656 {
657 .procname = "tcp_challenge_ack_limit",
658 .data = &sysctl_tcp_challenge_ack_limit,
659 .maxlen = sizeof(int),
660 .mode = 0644,
661 .proc_handler = proc_dointvec
662 },
663 #ifdef CONFIG_NET_DMA
664 {
665 .procname = "tcp_dma_copybreak",
666 .data = &sysctl_tcp_dma_copybreak,
667 .maxlen = sizeof(int),
668 .mode = 0644,
669 .proc_handler = proc_dointvec
670 },
671 #endif
672 {
673 .procname = "tcp_slow_start_after_idle",
674 .data = &sysctl_tcp_slow_start_after_idle,
675 .maxlen = sizeof(int),
676 .mode = 0644,
677 .proc_handler = proc_dointvec
678 },
679 #ifdef CONFIG_NETLABEL
680 {
681 .procname = "cipso_cache_enable",
682 .data = &cipso_v4_cache_enabled,
683 .maxlen = sizeof(int),
684 .mode = 0644,
685 .proc_handler = proc_dointvec,
686 },
687 {
688 .procname = "cipso_cache_bucket_size",
689 .data = &cipso_v4_cache_bucketsize,
690 .maxlen = sizeof(int),
691 .mode = 0644,
692 .proc_handler = proc_dointvec,
693 },
694 {
695 .procname = "cipso_rbm_optfmt",
696 .data = &cipso_v4_rbm_optfmt,
697 .maxlen = sizeof(int),
698 .mode = 0644,
699 .proc_handler = proc_dointvec,
700 },
701 {
702 .procname = "cipso_rbm_strictvalid",
703 .data = &cipso_v4_rbm_strictvalid,
704 .maxlen = sizeof(int),
705 .mode = 0644,
706 .proc_handler = proc_dointvec,
707 },
708 #endif /* CONFIG_NETLABEL */
709 {
710 .procname = "tcp_available_congestion_control",
711 .maxlen = TCP_CA_BUF_MAX,
712 .mode = 0444,
713 .proc_handler = proc_tcp_available_congestion_control,
714 },
715 {
716 .procname = "tcp_allowed_congestion_control",
717 .maxlen = TCP_CA_BUF_MAX,
718 .mode = 0644,
719 .proc_handler = proc_allowed_congestion_control,
720 },
721 {
722 .procname = "tcp_max_ssthresh",
723 .data = &sysctl_tcp_max_ssthresh,
724 .maxlen = sizeof(int),
725 .mode = 0644,
726 .proc_handler = proc_dointvec,
727 },
728 {
729 .procname = "tcp_thin_linear_timeouts",
730 .data = &sysctl_tcp_thin_linear_timeouts,
731 .maxlen = sizeof(int),
732 .mode = 0644,
733 .proc_handler = proc_dointvec
734 },
735 {
736 .procname = "tcp_thin_dupack",
737 .data = &sysctl_tcp_thin_dupack,
738 .maxlen = sizeof(int),
739 .mode = 0644,
740 .proc_handler = proc_dointvec
741 },
742 {
743 .procname = "tcp_early_retrans",
744 .data = &sysctl_tcp_early_retrans,
745 .maxlen = sizeof(int),
746 .mode = 0644,
747 .proc_handler = proc_dointvec_minmax,
748 .extra1 = &zero,
749 .extra2 = &four,
750 },
751 {
752 .procname = "udp_mem",
753 .data = &sysctl_udp_mem,
754 .maxlen = sizeof(sysctl_udp_mem),
755 .mode = 0644,
756 .proc_handler = proc_doulongvec_minmax,
757 },
758 {
759 .procname = "udp_rmem_min",
760 .data = &sysctl_udp_rmem_min,
761 .maxlen = sizeof(sysctl_udp_rmem_min),
762 .mode = 0644,
763 .proc_handler = proc_dointvec_minmax,
764 .extra1 = &one
765 },
766 {
767 .procname = "udp_wmem_min",
768 .data = &sysctl_udp_wmem_min,
769 .maxlen = sizeof(sysctl_udp_wmem_min),
770 .mode = 0644,
771 .proc_handler = proc_dointvec_minmax,
772 .extra1 = &one
773 },
774 { }
775 };
776
777 static struct ctl_table ipv4_net_table[] = {
778 {
779 .procname = "icmp_echo_ignore_all",
780 .data = &init_net.ipv4.sysctl_icmp_echo_ignore_all,
781 .maxlen = sizeof(int),
782 .mode = 0644,
783 .proc_handler = proc_dointvec
784 },
785 {
786 .procname = "icmp_echo_ignore_broadcasts",
787 .data = &init_net.ipv4.sysctl_icmp_echo_ignore_broadcasts,
788 .maxlen = sizeof(int),
789 .mode = 0644,
790 .proc_handler = proc_dointvec
791 },
792 {
793 .procname = "icmp_ignore_bogus_error_responses",
794 .data = &init_net.ipv4.sysctl_icmp_ignore_bogus_error_responses,
795 .maxlen = sizeof(int),
796 .mode = 0644,
797 .proc_handler = proc_dointvec
798 },
799 {
800 .procname = "icmp_errors_use_inbound_ifaddr",
801 .data = &init_net.ipv4.sysctl_icmp_errors_use_inbound_ifaddr,
802 .maxlen = sizeof(int),
803 .mode = 0644,
804 .proc_handler = proc_dointvec
805 },
806 {
807 .procname = "icmp_ratelimit",
808 .data = &init_net.ipv4.sysctl_icmp_ratelimit,
809 .maxlen = sizeof(int),
810 .mode = 0644,
811 .proc_handler = proc_dointvec_ms_jiffies,
812 },
813 {
814 .procname = "icmp_ratemask",
815 .data = &init_net.ipv4.sysctl_icmp_ratemask,
816 .maxlen = sizeof(int),
817 .mode = 0644,
818 .proc_handler = proc_dointvec
819 },
820 {
821 .procname = "ping_group_range",
822 .data = &init_net.ipv4.sysctl_ping_group_range,
823 .maxlen = sizeof(gid_t)*2,
824 .mode = 0644,
825 .proc_handler = ipv4_ping_group_range,
826 },
827 {
828 .procname = "tcp_ecn",
829 .data = &init_net.ipv4.sysctl_tcp_ecn,
830 .maxlen = sizeof(int),
831 .mode = 0644,
832 .proc_handler = proc_dointvec
833 },
834 {
835 .procname = "tcp_mem",
836 .maxlen = sizeof(init_net.ipv4.sysctl_tcp_mem),
837 .mode = 0644,
838 .proc_handler = ipv4_tcp_mem,
839 },
840 { }
841 };
842
843 static __net_init int ipv4_sysctl_init_net(struct net *net)
844 {
845 struct ctl_table *table;
846
847 table = ipv4_net_table;
848 if (!net_eq(net, &init_net)) {
849 table = kmemdup(table, sizeof(ipv4_net_table), GFP_KERNEL);
850 if (table == NULL)
851 goto err_alloc;
852
853 table[0].data =
854 &net->ipv4.sysctl_icmp_echo_ignore_all;
855 table[1].data =
856 &net->ipv4.sysctl_icmp_echo_ignore_broadcasts;
857 table[2].data =
858 &net->ipv4.sysctl_icmp_ignore_bogus_error_responses;
859 table[3].data =
860 &net->ipv4.sysctl_icmp_errors_use_inbound_ifaddr;
861 table[4].data =
862 &net->ipv4.sysctl_icmp_ratelimit;
863 table[5].data =
864 &net->ipv4.sysctl_icmp_ratemask;
865 table[6].data =
866 &net->ipv4.sysctl_ping_group_range;
867 table[7].data =
868 &net->ipv4.sysctl_tcp_ecn;
869
870 /* Don't export sysctls to unprivileged users */
871 if (net->user_ns != &init_user_ns)
872 table[0].procname = NULL;
873 }
874
875 /*
876 * Sane defaults - nobody may create ping sockets.
877 * Boot scripts should set this to distro-specific group.
878 */
879 net->ipv4.sysctl_ping_group_range[0] = make_kgid(&init_user_ns, 1);
880 net->ipv4.sysctl_ping_group_range[1] = make_kgid(&init_user_ns, 0);
881
882 tcp_init_mem(net);
883
884 net->ipv4.ipv4_hdr = register_net_sysctl(net, "net/ipv4", table);
885 if (net->ipv4.ipv4_hdr == NULL)
886 goto err_reg;
887
888 return 0;
889
890 err_reg:
891 if (!net_eq(net, &init_net))
892 kfree(table);
893 err_alloc:
894 return -ENOMEM;
895 }
896
897 static __net_exit void ipv4_sysctl_exit_net(struct net *net)
898 {
899 struct ctl_table *table;
900
901 table = net->ipv4.ipv4_hdr->ctl_table_arg;
902 unregister_net_sysctl_table(net->ipv4.ipv4_hdr);
903 kfree(table);
904 }
905
906 static __net_initdata struct pernet_operations ipv4_sysctl_ops = {
907 .init = ipv4_sysctl_init_net,
908 .exit = ipv4_sysctl_exit_net,
909 };
910
911 static __init int sysctl_ipv4_init(void)
912 {
913 struct ctl_table_header *hdr;
914 struct ctl_table *i;
915
916 for (i = ipv4_table; i->procname; i++) {
917 if (strcmp(i->procname, "ip_local_reserved_ports") == 0) {
918 i->data = sysctl_local_reserved_ports;
919 break;
920 }
921 }
922 if (!i->procname)
923 return -EINVAL;
924
925 hdr = register_net_sysctl(&init_net, "net/ipv4", ipv4_table);
926 if (hdr == NULL)
927 return -ENOMEM;
928
929 if (register_pernet_subsys(&ipv4_sysctl_ops)) {
930 unregister_net_sysctl_table(hdr);
931 return -ENOMEM;
932 }
933
934 return 0;
935 }
936
937 __initcall(sysctl_ipv4_init);
Linus' kernel tree