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Merge remote-tracking branch 'asoc/topic/ac97' into asoc-fsl
[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 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 tcp_syn_retries_min = 1;
40 static int tcp_syn_retries_max = MAX_TCP_SYNCNT;
41 static int ip_ping_group_range_min[] = { 0, 0 };
42 static int ip_ping_group_range_max[] = { GID_T_MAX, GID_T_MAX };
43
44 /* Update system visible IP port range */
45 static void set_local_port_range(int range[2])
46 {
47 write_seqlock(&sysctl_local_ports.lock);
48 sysctl_local_ports.range[0] = range[0];
49 sysctl_local_ports.range[1] = range[1];
50 write_sequnlock(&sysctl_local_ports.lock);
51 }
52
53 /* Validate changes from /proc interface. */
54 static int ipv4_local_port_range(struct ctl_table *table, int write,
55 void __user *buffer,
56 size_t *lenp, loff_t *ppos)
57 {
58 int ret;
59 int range[2];
60 struct ctl_table tmp = {
61 .data = &range,
62 .maxlen = sizeof(range),
63 .mode = table->mode,
64 .extra1 = &ip_local_port_range_min,
65 .extra2 = &ip_local_port_range_max,
66 };
67
68 inet_get_local_port_range(range, range + 1);
69 ret = proc_dointvec_minmax(&tmp, write, buffer, lenp, ppos);
70
71 if (write && ret == 0) {
72 if (range[1] < range[0])
73 ret = -EINVAL;
74 else
75 set_local_port_range(range);
76 }
77
78 return ret;
79 }
80
81
82 static void inet_get_ping_group_range_table(struct ctl_table *table, kgid_t *low, kgid_t *high)
83 {
84 kgid_t *data = table->data;
85 unsigned int seq;
86 do {
87 seq = read_seqbegin(&sysctl_local_ports.lock);
88
89 *low = data[0];
90 *high = data[1];
91 } while (read_seqretry(&sysctl_local_ports.lock, seq));
92 }
93
94 /* Update system visible IP port range */
95 static void set_ping_group_range(struct ctl_table *table, kgid_t low, kgid_t high)
96 {
97 kgid_t *data = table->data;
98 write_seqlock(&sysctl_local_ports.lock);
99 data[0] = low;
100 data[1] = high;
101 write_sequnlock(&sysctl_local_ports.lock);
102 }
103
104 /* Validate changes from /proc interface. */
105 static int ipv4_ping_group_range(struct ctl_table *table, int write,
106 void __user *buffer,
107 size_t *lenp, loff_t *ppos)
108 {
109 struct user_namespace *user_ns = current_user_ns();
110 int ret;
111 gid_t urange[2];
112 kgid_t low, high;
113 struct ctl_table tmp = {
114 .data = &urange,
115 .maxlen = sizeof(urange),
116 .mode = table->mode,
117 .extra1 = &ip_ping_group_range_min,
118 .extra2 = &ip_ping_group_range_max,
119 };
120
121 inet_get_ping_group_range_table(table, &low, &high);
122 urange[0] = from_kgid_munged(user_ns, low);
123 urange[1] = from_kgid_munged(user_ns, high);
124 ret = proc_dointvec_minmax(&tmp, write, buffer, lenp, ppos);
125
126 if (write && ret == 0) {
127 low = make_kgid(user_ns, urange[0]);
128 high = make_kgid(user_ns, urange[1]);
129 if (!gid_valid(low) || !gid_valid(high) ||
130 (urange[1] < urange[0]) || gid_lt(high, low)) {
131 low = make_kgid(&init_user_ns, 1);
132 high = make_kgid(&init_user_ns, 0);
133 }
134 set_ping_group_range(table, low, high);
135 }
136
137 return ret;
138 }
139
140 static int proc_tcp_congestion_control(struct ctl_table *ctl, int write,
141 void __user *buffer, size_t *lenp, loff_t *ppos)
142 {
143 char val[TCP_CA_NAME_MAX];
144 struct ctl_table tbl = {
145 .data = val,
146 .maxlen = TCP_CA_NAME_MAX,
147 };
148 int ret;
149
150 tcp_get_default_congestion_control(val);
151
152 ret = proc_dostring(&tbl, write, buffer, lenp, ppos);
153 if (write && ret == 0)
154 ret = tcp_set_default_congestion_control(val);
155 return ret;
156 }
157
158 static int proc_tcp_available_congestion_control(struct ctl_table *ctl,
159 int write,
160 void __user *buffer, size_t *lenp,
161 loff_t *ppos)
162 {
163 struct ctl_table tbl = { .maxlen = TCP_CA_BUF_MAX, };
164 int ret;
165
166 tbl.data = kmalloc(tbl.maxlen, GFP_USER);
167 if (!tbl.data)
168 return -ENOMEM;
169 tcp_get_available_congestion_control(tbl.data, TCP_CA_BUF_MAX);
170 ret = proc_dostring(&tbl, write, buffer, lenp, ppos);
171 kfree(tbl.data);
172 return ret;
173 }
174
175 static int proc_allowed_congestion_control(struct ctl_table *ctl,
176 int write,
177 void __user *buffer, size_t *lenp,
178 loff_t *ppos)
179 {
180 struct ctl_table tbl = { .maxlen = TCP_CA_BUF_MAX };
181 int ret;
182
183 tbl.data = kmalloc(tbl.maxlen, GFP_USER);
184 if (!tbl.data)
185 return -ENOMEM;
186
187 tcp_get_allowed_congestion_control(tbl.data, tbl.maxlen);
188 ret = proc_dostring(&tbl, write, buffer, lenp, ppos);
189 if (write && ret == 0)
190 ret = tcp_set_allowed_congestion_control(tbl.data);
191 kfree(tbl.data);
192 return ret;
193 }
194
195 static int ipv4_tcp_mem(struct ctl_table *ctl, int write,
196 void __user *buffer, size_t *lenp,
197 loff_t *ppos)
198 {
199 int ret;
200 unsigned long vec[3];
201 struct net *net = current->nsproxy->net_ns;
202 #ifdef CONFIG_MEMCG_KMEM
203 struct mem_cgroup *memcg;
204 #endif
205
206 struct ctl_table tmp = {
207 .data = &vec,
208 .maxlen = sizeof(vec),
209 .mode = ctl->mode,
210 };
211
212 if (!write) {
213 ctl->data = &net->ipv4.sysctl_tcp_mem;
214 return proc_doulongvec_minmax(ctl, write, buffer, lenp, ppos);
215 }
216
217 ret = proc_doulongvec_minmax(&tmp, write, buffer, lenp, ppos);
218 if (ret)
219 return ret;
220
221 #ifdef CONFIG_MEMCG_KMEM
222 rcu_read_lock();
223 memcg = mem_cgroup_from_task(current);
224
225 tcp_prot_mem(memcg, vec[0], 0);
226 tcp_prot_mem(memcg, vec[1], 1);
227 tcp_prot_mem(memcg, vec[2], 2);
228 rcu_read_unlock();
229 #endif
230
231 net->ipv4.sysctl_tcp_mem[0] = vec[0];
232 net->ipv4.sysctl_tcp_mem[1] = vec[1];
233 net->ipv4.sysctl_tcp_mem[2] = vec[2];
234
235 return 0;
236 }
237
238 static int proc_tcp_fastopen_key(struct ctl_table *ctl, int write,
239 void __user *buffer, size_t *lenp,
240 loff_t *ppos)
241 {
242 struct ctl_table tbl = { .maxlen = (TCP_FASTOPEN_KEY_LENGTH * 2 + 10) };
243 struct tcp_fastopen_context *ctxt;
244 int ret;
245 u32 user_key[4]; /* 16 bytes, matching TCP_FASTOPEN_KEY_LENGTH */
246
247 tbl.data = kmalloc(tbl.maxlen, GFP_KERNEL);
248 if (!tbl.data)
249 return -ENOMEM;
250
251 rcu_read_lock();
252 ctxt = rcu_dereference(tcp_fastopen_ctx);
253 if (ctxt)
254 memcpy(user_key, ctxt->key, TCP_FASTOPEN_KEY_LENGTH);
255 else
256 memset(user_key, 0, sizeof(user_key));
257 rcu_read_unlock();
258
259 snprintf(tbl.data, tbl.maxlen, "%08x-%08x-%08x-%08x",
260 user_key[0], user_key[1], user_key[2], user_key[3]);
261 ret = proc_dostring(&tbl, write, buffer, lenp, ppos);
262
263 if (write && ret == 0) {
264 if (sscanf(tbl.data, "%x-%x-%x-%x", user_key, user_key + 1,
265 user_key + 2, user_key + 3) != 4) {
266 ret = -EINVAL;
267 goto bad_key;
268 }
269 tcp_fastopen_reset_cipher(user_key, TCP_FASTOPEN_KEY_LENGTH);
270 }
271
272 bad_key:
273 pr_debug("proc FO key set 0x%x-%x-%x-%x <- 0x%s: %u\n",
274 user_key[0], user_key[1], user_key[2], user_key[3],
275 (char *)tbl.data, ret);
276 kfree(tbl.data);
277 return ret;
278 }
279
280 static struct ctl_table ipv4_table[] = {
281 {
282 .procname = "tcp_timestamps",
283 .data = &sysctl_tcp_timestamps,
284 .maxlen = sizeof(int),
285 .mode = 0644,
286 .proc_handler = proc_dointvec
287 },
288 {
289 .procname = "tcp_window_scaling",
290 .data = &sysctl_tcp_window_scaling,
291 .maxlen = sizeof(int),
292 .mode = 0644,
293 .proc_handler = proc_dointvec
294 },
295 {
296 .procname = "tcp_sack",
297 .data = &sysctl_tcp_sack,
298 .maxlen = sizeof(int),
299 .mode = 0644,
300 .proc_handler = proc_dointvec
301 },
302 {
303 .procname = "tcp_retrans_collapse",
304 .data = &sysctl_tcp_retrans_collapse,
305 .maxlen = sizeof(int),
306 .mode = 0644,
307 .proc_handler = proc_dointvec
308 },
309 {
310 .procname = "ip_default_ttl",
311 .data = &sysctl_ip_default_ttl,
312 .maxlen = sizeof(int),
313 .mode = 0644,
314 .proc_handler = proc_dointvec_minmax,
315 .extra1 = &ip_ttl_min,
316 .extra2 = &ip_ttl_max,
317 },
318 {
319 .procname = "ip_no_pmtu_disc",
320 .data = &ipv4_config.no_pmtu_disc,
321 .maxlen = sizeof(int),
322 .mode = 0644,
323 .proc_handler = proc_dointvec
324 },
325 {
326 .procname = "ip_nonlocal_bind",
327 .data = &sysctl_ip_nonlocal_bind,
328 .maxlen = sizeof(int),
329 .mode = 0644,
330 .proc_handler = proc_dointvec
331 },
332 {
333 .procname = "tcp_syn_retries",
334 .data = &sysctl_tcp_syn_retries,
335 .maxlen = sizeof(int),
336 .mode = 0644,
337 .proc_handler = proc_dointvec_minmax,
338 .extra1 = &tcp_syn_retries_min,
339 .extra2 = &tcp_syn_retries_max
340 },
341 {
342 .procname = "tcp_synack_retries",
343 .data = &sysctl_tcp_synack_retries,
344 .maxlen = sizeof(int),
345 .mode = 0644,
346 .proc_handler = proc_dointvec
347 },
348 {
349 .procname = "tcp_max_orphans",
350 .data = &sysctl_tcp_max_orphans,
351 .maxlen = sizeof(int),
352 .mode = 0644,
353 .proc_handler = proc_dointvec
354 },
355 {
356 .procname = "tcp_max_tw_buckets",
357 .data = &tcp_death_row.sysctl_max_tw_buckets,
358 .maxlen = sizeof(int),
359 .mode = 0644,
360 .proc_handler = proc_dointvec
361 },
362 {
363 .procname = "ip_early_demux",
364 .data = &sysctl_ip_early_demux,
365 .maxlen = sizeof(int),
366 .mode = 0644,
367 .proc_handler = proc_dointvec
368 },
369 {
370 .procname = "ip_dynaddr",
371 .data = &sysctl_ip_dynaddr,
372 .maxlen = sizeof(int),
373 .mode = 0644,
374 .proc_handler = proc_dointvec
375 },
376 {
377 .procname = "tcp_keepalive_time",
378 .data = &sysctl_tcp_keepalive_time,
379 .maxlen = sizeof(int),
380 .mode = 0644,
381 .proc_handler = proc_dointvec_jiffies,
382 },
383 {
384 .procname = "tcp_keepalive_probes",
385 .data = &sysctl_tcp_keepalive_probes,
386 .maxlen = sizeof(int),
387 .mode = 0644,
388 .proc_handler = proc_dointvec
389 },
390 {
391 .procname = "tcp_keepalive_intvl",
392 .data = &sysctl_tcp_keepalive_intvl,
393 .maxlen = sizeof(int),
394 .mode = 0644,
395 .proc_handler = proc_dointvec_jiffies,
396 },
397 {
398 .procname = "tcp_retries1",
399 .data = &sysctl_tcp_retries1,
400 .maxlen = sizeof(int),
401 .mode = 0644,
402 .proc_handler = proc_dointvec_minmax,
403 .extra2 = &tcp_retr1_max
404 },
405 {
406 .procname = "tcp_retries2",
407 .data = &sysctl_tcp_retries2,
408 .maxlen = sizeof(int),
409 .mode = 0644,
410 .proc_handler = proc_dointvec
411 },
412 {
413 .procname = "tcp_fin_timeout",
414 .data = &sysctl_tcp_fin_timeout,
415 .maxlen = sizeof(int),
416 .mode = 0644,
417 .proc_handler = proc_dointvec_jiffies,
418 },
419 #ifdef CONFIG_SYN_COOKIES
420 {
421 .procname = "tcp_syncookies",
422 .data = &sysctl_tcp_syncookies,
423 .maxlen = sizeof(int),
424 .mode = 0644,
425 .proc_handler = proc_dointvec
426 },
427 #endif
428 {
429 .procname = "tcp_fastopen",
430 .data = &sysctl_tcp_fastopen,
431 .maxlen = sizeof(int),
432 .mode = 0644,
433 .proc_handler = proc_dointvec,
434 },
435 {
436 .procname = "tcp_fastopen_key",
437 .mode = 0600,
438 .maxlen = ((TCP_FASTOPEN_KEY_LENGTH * 2) + 10),
439 .proc_handler = proc_tcp_fastopen_key,
440 },
441 {
442 .procname = "tcp_tw_recycle",
443 .data = &tcp_death_row.sysctl_tw_recycle,
444 .maxlen = sizeof(int),
445 .mode = 0644,
446 .proc_handler = proc_dointvec
447 },
448 {
449 .procname = "tcp_abort_on_overflow",
450 .data = &sysctl_tcp_abort_on_overflow,
451 .maxlen = sizeof(int),
452 .mode = 0644,
453 .proc_handler = proc_dointvec
454 },
455 {
456 .procname = "tcp_stdurg",
457 .data = &sysctl_tcp_stdurg,
458 .maxlen = sizeof(int),
459 .mode = 0644,
460 .proc_handler = proc_dointvec
461 },
462 {
463 .procname = "tcp_rfc1337",
464 .data = &sysctl_tcp_rfc1337,
465 .maxlen = sizeof(int),
466 .mode = 0644,
467 .proc_handler = proc_dointvec
468 },
469 {
470 .procname = "tcp_max_syn_backlog",
471 .data = &sysctl_max_syn_backlog,
472 .maxlen = sizeof(int),
473 .mode = 0644,
474 .proc_handler = proc_dointvec
475 },
476 {
477 .procname = "ip_local_port_range",
478 .data = &sysctl_local_ports.range,
479 .maxlen = sizeof(sysctl_local_ports.range),
480 .mode = 0644,
481 .proc_handler = ipv4_local_port_range,
482 },
483 {
484 .procname = "ip_local_reserved_ports",
485 .data = NULL, /* initialized in sysctl_ipv4_init */
486 .maxlen = 65536,
487 .mode = 0644,
488 .proc_handler = proc_do_large_bitmap,
489 },
490 {
491 .procname = "igmp_max_memberships",
492 .data = &sysctl_igmp_max_memberships,
493 .maxlen = sizeof(int),
494 .mode = 0644,
495 .proc_handler = proc_dointvec
496 },
497 {
498 .procname = "igmp_max_msf",
499 .data = &sysctl_igmp_max_msf,
500 .maxlen = sizeof(int),
501 .mode = 0644,
502 .proc_handler = proc_dointvec
503 },
504 {
505 .procname = "inet_peer_threshold",
506 .data = &inet_peer_threshold,
507 .maxlen = sizeof(int),
508 .mode = 0644,
509 .proc_handler = proc_dointvec
510 },
511 {
512 .procname = "inet_peer_minttl",
513 .data = &inet_peer_minttl,
514 .maxlen = sizeof(int),
515 .mode = 0644,
516 .proc_handler = proc_dointvec_jiffies,
517 },
518 {
519 .procname = "inet_peer_maxttl",
520 .data = &inet_peer_maxttl,
521 .maxlen = sizeof(int),
522 .mode = 0644,
523 .proc_handler = proc_dointvec_jiffies,
524 },
525 {
526 .procname = "tcp_orphan_retries",
527 .data = &sysctl_tcp_orphan_retries,
528 .maxlen = sizeof(int),
529 .mode = 0644,
530 .proc_handler = proc_dointvec
531 },
532 {
533 .procname = "tcp_fack",
534 .data = &sysctl_tcp_fack,
535 .maxlen = sizeof(int),
536 .mode = 0644,
537 .proc_handler = proc_dointvec
538 },
539 {
540 .procname = "tcp_reordering",
541 .data = &sysctl_tcp_reordering,
542 .maxlen = sizeof(int),
543 .mode = 0644,
544 .proc_handler = proc_dointvec
545 },
546 {
547 .procname = "tcp_dsack",
548 .data = &sysctl_tcp_dsack,
549 .maxlen = sizeof(int),
550 .mode = 0644,
551 .proc_handler = proc_dointvec
552 },
553 {
554 .procname = "tcp_wmem",
555 .data = &sysctl_tcp_wmem,
556 .maxlen = sizeof(sysctl_tcp_wmem),
557 .mode = 0644,
558 .proc_handler = proc_dointvec_minmax,
559 .extra1 = &one,
560 },
561 {
562 .procname = "tcp_rmem",
563 .data = &sysctl_tcp_rmem,
564 .maxlen = sizeof(sysctl_tcp_rmem),
565 .mode = 0644,
566 .proc_handler = proc_dointvec_minmax,
567 .extra1 = &one,
568 },
569 {
570 .procname = "tcp_app_win",
571 .data = &sysctl_tcp_app_win,
572 .maxlen = sizeof(int),
573 .mode = 0644,
574 .proc_handler = proc_dointvec
575 },
576 {
577 .procname = "tcp_adv_win_scale",
578 .data = &sysctl_tcp_adv_win_scale,
579 .maxlen = sizeof(int),
580 .mode = 0644,
581 .proc_handler = proc_dointvec_minmax,
582 .extra1 = &tcp_adv_win_scale_min,
583 .extra2 = &tcp_adv_win_scale_max,
584 },
585 {
586 .procname = "tcp_tw_reuse",
587 .data = &sysctl_tcp_tw_reuse,
588 .maxlen = sizeof(int),
589 .mode = 0644,
590 .proc_handler = proc_dointvec
591 },
592 {
593 .procname = "tcp_frto",
594 .data = &sysctl_tcp_frto,
595 .maxlen = sizeof(int),
596 .mode = 0644,
597 .proc_handler = proc_dointvec
598 },
599 {
600 .procname = "tcp_low_latency",
601 .data = &sysctl_tcp_low_latency,
602 .maxlen = sizeof(int),
603 .mode = 0644,
604 .proc_handler = proc_dointvec
605 },
606 {
607 .procname = "tcp_no_metrics_save",
608 .data = &sysctl_tcp_nometrics_save,
609 .maxlen = sizeof(int),
610 .mode = 0644,
611 .proc_handler = proc_dointvec,
612 },
613 {
614 .procname = "tcp_moderate_rcvbuf",
615 .data = &sysctl_tcp_moderate_rcvbuf,
616 .maxlen = sizeof(int),
617 .mode = 0644,
618 .proc_handler = proc_dointvec,
619 },
620 {
621 .procname = "tcp_tso_win_divisor",
622 .data = &sysctl_tcp_tso_win_divisor,
623 .maxlen = sizeof(int),
624 .mode = 0644,
625 .proc_handler = proc_dointvec,
626 },
627 {
628 .procname = "tcp_congestion_control",
629 .mode = 0644,
630 .maxlen = TCP_CA_NAME_MAX,
631 .proc_handler = proc_tcp_congestion_control,
632 },
633 {
634 .procname = "tcp_mtu_probing",
635 .data = &sysctl_tcp_mtu_probing,
636 .maxlen = sizeof(int),
637 .mode = 0644,
638 .proc_handler = proc_dointvec,
639 },
640 {
641 .procname = "tcp_base_mss",
642 .data = &sysctl_tcp_base_mss,
643 .maxlen = sizeof(int),
644 .mode = 0644,
645 .proc_handler = proc_dointvec,
646 },
647 {
648 .procname = "tcp_workaround_signed_windows",
649 .data = &sysctl_tcp_workaround_signed_windows,
650 .maxlen = sizeof(int),
651 .mode = 0644,
652 .proc_handler = proc_dointvec
653 },
654 {
655 .procname = "tcp_limit_output_bytes",
656 .data = &sysctl_tcp_limit_output_bytes,
657 .maxlen = sizeof(int),
658 .mode = 0644,
659 .proc_handler = proc_dointvec
660 },
661 {
662 .procname = "tcp_challenge_ack_limit",
663 .data = &sysctl_tcp_challenge_ack_limit,
664 .maxlen = sizeof(int),
665 .mode = 0644,
666 .proc_handler = proc_dointvec
667 },
668 #ifdef CONFIG_NET_DMA
669 {
670 .procname = "tcp_dma_copybreak",
671 .data = &sysctl_tcp_dma_copybreak,
672 .maxlen = sizeof(int),
673 .mode = 0644,
674 .proc_handler = proc_dointvec
675 },
676 #endif
677 {
678 .procname = "tcp_slow_start_after_idle",
679 .data = &sysctl_tcp_slow_start_after_idle,
680 .maxlen = sizeof(int),
681 .mode = 0644,
682 .proc_handler = proc_dointvec
683 },
684 #ifdef CONFIG_NETLABEL
685 {
686 .procname = "cipso_cache_enable",
687 .data = &cipso_v4_cache_enabled,
688 .maxlen = sizeof(int),
689 .mode = 0644,
690 .proc_handler = proc_dointvec,
691 },
692 {
693 .procname = "cipso_cache_bucket_size",
694 .data = &cipso_v4_cache_bucketsize,
695 .maxlen = sizeof(int),
696 .mode = 0644,
697 .proc_handler = proc_dointvec,
698 },
699 {
700 .procname = "cipso_rbm_optfmt",
701 .data = &cipso_v4_rbm_optfmt,
702 .maxlen = sizeof(int),
703 .mode = 0644,
704 .proc_handler = proc_dointvec,
705 },
706 {
707 .procname = "cipso_rbm_strictvalid",
708 .data = &cipso_v4_rbm_strictvalid,
709 .maxlen = sizeof(int),
710 .mode = 0644,
711 .proc_handler = proc_dointvec,
712 },
713 #endif /* CONFIG_NETLABEL */
714 {
715 .procname = "tcp_available_congestion_control",
716 .maxlen = TCP_CA_BUF_MAX,
717 .mode = 0444,
718 .proc_handler = proc_tcp_available_congestion_control,
719 },
720 {
721 .procname = "tcp_allowed_congestion_control",
722 .maxlen = TCP_CA_BUF_MAX,
723 .mode = 0644,
724 .proc_handler = proc_allowed_congestion_control,
725 },
726 {
727 .procname = "tcp_max_ssthresh",
728 .data = &sysctl_tcp_max_ssthresh,
729 .maxlen = sizeof(int),
730 .mode = 0644,
731 .proc_handler = proc_dointvec,
732 },
733 {
734 .procname = "tcp_thin_linear_timeouts",
735 .data = &sysctl_tcp_thin_linear_timeouts,
736 .maxlen = sizeof(int),
737 .mode = 0644,
738 .proc_handler = proc_dointvec
739 },
740 {
741 .procname = "tcp_thin_dupack",
742 .data = &sysctl_tcp_thin_dupack,
743 .maxlen = sizeof(int),
744 .mode = 0644,
745 .proc_handler = proc_dointvec
746 },
747 {
748 .procname = "tcp_early_retrans",
749 .data = &sysctl_tcp_early_retrans,
750 .maxlen = sizeof(int),
751 .mode = 0644,
752 .proc_handler = proc_dointvec_minmax,
753 .extra1 = &zero,
754 .extra2 = &four,
755 },
756 {
757 .procname = "udp_mem",
758 .data = &sysctl_udp_mem,
759 .maxlen = sizeof(sysctl_udp_mem),
760 .mode = 0644,
761 .proc_handler = proc_doulongvec_minmax,
762 },
763 {
764 .procname = "udp_rmem_min",
765 .data = &sysctl_udp_rmem_min,
766 .maxlen = sizeof(sysctl_udp_rmem_min),
767 .mode = 0644,
768 .proc_handler = proc_dointvec_minmax,
769 .extra1 = &one
770 },
771 {
772 .procname = "udp_wmem_min",
773 .data = &sysctl_udp_wmem_min,
774 .maxlen = sizeof(sysctl_udp_wmem_min),
775 .mode = 0644,
776 .proc_handler = proc_dointvec_minmax,
777 .extra1 = &one
778 },
779 { }
780 };
781
782 static struct ctl_table ipv4_net_table[] = {
783 {
784 .procname = "icmp_echo_ignore_all",
785 .data = &init_net.ipv4.sysctl_icmp_echo_ignore_all,
786 .maxlen = sizeof(int),
787 .mode = 0644,
788 .proc_handler = proc_dointvec
789 },
790 {
791 .procname = "icmp_echo_ignore_broadcasts",
792 .data = &init_net.ipv4.sysctl_icmp_echo_ignore_broadcasts,
793 .maxlen = sizeof(int),
794 .mode = 0644,
795 .proc_handler = proc_dointvec
796 },
797 {
798 .procname = "icmp_ignore_bogus_error_responses",
799 .data = &init_net.ipv4.sysctl_icmp_ignore_bogus_error_responses,
800 .maxlen = sizeof(int),
801 .mode = 0644,
802 .proc_handler = proc_dointvec
803 },
804 {
805 .procname = "icmp_errors_use_inbound_ifaddr",
806 .data = &init_net.ipv4.sysctl_icmp_errors_use_inbound_ifaddr,
807 .maxlen = sizeof(int),
808 .mode = 0644,
809 .proc_handler = proc_dointvec
810 },
811 {
812 .procname = "icmp_ratelimit",
813 .data = &init_net.ipv4.sysctl_icmp_ratelimit,
814 .maxlen = sizeof(int),
815 .mode = 0644,
816 .proc_handler = proc_dointvec_ms_jiffies,
817 },
818 {
819 .procname = "icmp_ratemask",
820 .data = &init_net.ipv4.sysctl_icmp_ratemask,
821 .maxlen = sizeof(int),
822 .mode = 0644,
823 .proc_handler = proc_dointvec
824 },
825 {
826 .procname = "ping_group_range",
827 .data = &init_net.ipv4.sysctl_ping_group_range,
828 .maxlen = sizeof(gid_t)*2,
829 .mode = 0644,
830 .proc_handler = ipv4_ping_group_range,
831 },
832 {
833 .procname = "tcp_ecn",
834 .data = &init_net.ipv4.sysctl_tcp_ecn,
835 .maxlen = sizeof(int),
836 .mode = 0644,
837 .proc_handler = proc_dointvec
838 },
839 {
840 .procname = "tcp_mem",
841 .maxlen = sizeof(init_net.ipv4.sysctl_tcp_mem),
842 .mode = 0644,
843 .proc_handler = ipv4_tcp_mem,
844 },
845 { }
846 };
847
848 static __net_init int ipv4_sysctl_init_net(struct net *net)
849 {
850 struct ctl_table *table;
851
852 table = ipv4_net_table;
853 if (!net_eq(net, &init_net)) {
854 table = kmemdup(table, sizeof(ipv4_net_table), GFP_KERNEL);
855 if (table == NULL)
856 goto err_alloc;
857
858 table[0].data =
859 &net->ipv4.sysctl_icmp_echo_ignore_all;
860 table[1].data =
861 &net->ipv4.sysctl_icmp_echo_ignore_broadcasts;
862 table[2].data =
863 &net->ipv4.sysctl_icmp_ignore_bogus_error_responses;
864 table[3].data =
865 &net->ipv4.sysctl_icmp_errors_use_inbound_ifaddr;
866 table[4].data =
867 &net->ipv4.sysctl_icmp_ratelimit;
868 table[5].data =
869 &net->ipv4.sysctl_icmp_ratemask;
870 table[6].data =
871 &net->ipv4.sysctl_ping_group_range;
872 table[7].data =
873 &net->ipv4.sysctl_tcp_ecn;
874
875 /* Don't export sysctls to unprivileged users */
876 if (net->user_ns != &init_user_ns)
877 table[0].procname = NULL;
878 }
879
880 /*
881 * Sane defaults - nobody may create ping sockets.
882 * Boot scripts should set this to distro-specific group.
883 */
884 net->ipv4.sysctl_ping_group_range[0] = make_kgid(&init_user_ns, 1);
885 net->ipv4.sysctl_ping_group_range[1] = make_kgid(&init_user_ns, 0);
886
887 tcp_init_mem(net);
888
889 net->ipv4.ipv4_hdr = register_net_sysctl(net, "net/ipv4", table);
890 if (net->ipv4.ipv4_hdr == NULL)
891 goto err_reg;
892
893 return 0;
894
895 err_reg:
896 if (!net_eq(net, &init_net))
897 kfree(table);
898 err_alloc:
899 return -ENOMEM;
900 }
901
902 static __net_exit void ipv4_sysctl_exit_net(struct net *net)
903 {
904 struct ctl_table *table;
905
906 table = net->ipv4.ipv4_hdr->ctl_table_arg;
907 unregister_net_sysctl_table(net->ipv4.ipv4_hdr);
908 kfree(table);
909 }
910
911 static __net_initdata struct pernet_operations ipv4_sysctl_ops = {
912 .init = ipv4_sysctl_init_net,
913 .exit = ipv4_sysctl_exit_net,
914 };
915
916 static __init int sysctl_ipv4_init(void)
917 {
918 struct ctl_table_header *hdr;
919 struct ctl_table *i;
920
921 for (i = ipv4_table; i->procname; i++) {
922 if (strcmp(i->procname, "ip_local_reserved_ports") == 0) {
923 i->data = sysctl_local_reserved_ports;
924 break;
925 }
926 }
927 if (!i->procname)
928 return -EINVAL;
929
930 hdr = register_net_sysctl(&init_net, "net/ipv4", ipv4_table);
931 if (hdr == NULL)
932 return -ENOMEM;
933
934 if (register_pernet_subsys(&ipv4_sysctl_ops)) {
935 unregister_net_sysctl_table(hdr);
936 return -ENOMEM;
937 }
938
939 return 0;
940 }
941
942 __initcall(sysctl_ipv4_init);
Linux kernel - Deliverables
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