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Linux 3.8-rc7
[cris-mirror.git] / net / ipv4 / sysctl_net_ipv4.c
blobd84400b65049e61bc64f8f8eef37e2be2aaf2eda
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 two = 2;
31 static int tcp_retr1_max = 255;
32 static int ip_local_port_range_min[] = { 1, 1 };
33 static int ip_local_port_range_max[] = { 65535, 65535 };
34 static int tcp_adv_win_scale_min = -31;
35 static int tcp_adv_win_scale_max = 31;
36 static int ip_ttl_min = 1;
37 static int ip_ttl_max = 255;
38 static int ip_ping_group_range_min[] = { 0, 0 };
39 static int ip_ping_group_range_max[] = { GID_T_MAX, GID_T_MAX };
40
41 /* Update system visible IP port range */
42 static void set_local_port_range(int range[2])
43 {
44 write_seqlock(&sysctl_local_ports.lock);
45 sysctl_local_ports.range[0] = range[0];
46 sysctl_local_ports.range[1] = range[1];
47 write_sequnlock(&sysctl_local_ports.lock);
48 }
49
50 /* Validate changes from /proc interface. */
51 static int ipv4_local_port_range(ctl_table *table, int write,
52 void __user *buffer,
53 size_t *lenp, loff_t *ppos)
54 {
55 int ret;
56 int range[2];
57 ctl_table tmp = {
58 .data = &range,
59 .maxlen = sizeof(range),
60 .mode = table->mode,
61 .extra1 = &ip_local_port_range_min,
62 .extra2 = &ip_local_port_range_max,
63 };
64
65 inet_get_local_port_range(range, range + 1);
66 ret = proc_dointvec_minmax(&tmp, write, buffer, lenp, ppos);
67
68 if (write && ret == 0) {
69 if (range[1] < range[0])
70 ret = -EINVAL;
71 else
72 set_local_port_range(range);
73 }
74
75 return ret;
76 }
77
78
79 static void inet_get_ping_group_range_table(struct ctl_table *table, kgid_t *low, kgid_t *high)
80 {
81 kgid_t *data = table->data;
82 unsigned int seq;
83 do {
84 seq = read_seqbegin(&sysctl_local_ports.lock);
85
86 *low = data[0];
87 *high = data[1];
88 } while (read_seqretry(&sysctl_local_ports.lock, seq));
89 }
90
91 /* Update system visible IP port range */
92 static void set_ping_group_range(struct ctl_table *table, kgid_t low, kgid_t high)
93 {
94 kgid_t *data = table->data;
95 write_seqlock(&sysctl_local_ports.lock);
96 data[0] = low;
97 data[1] = high;
98 write_sequnlock(&sysctl_local_ports.lock);
99 }
100
101 /* Validate changes from /proc interface. */
102 static int ipv4_ping_group_range(ctl_table *table, int write,
103 void __user *buffer,
104 size_t *lenp, loff_t *ppos)
105 {
106 struct user_namespace *user_ns = current_user_ns();
107 int ret;
108 gid_t urange[2];
109 kgid_t low, high;
110 ctl_table tmp = {
111 .data = &urange,
112 .maxlen = sizeof(urange),
113 .mode = table->mode,
114 .extra1 = &ip_ping_group_range_min,
115 .extra2 = &ip_ping_group_range_max,
116 };
117
118 inet_get_ping_group_range_table(table, &low, &high);
119 urange[0] = from_kgid_munged(user_ns, low);
120 urange[1] = from_kgid_munged(user_ns, high);
121 ret = proc_dointvec_minmax(&tmp, write, buffer, lenp, ppos);
122
123 if (write && ret == 0) {
124 low = make_kgid(user_ns, urange[0]);
125 high = make_kgid(user_ns, urange[1]);
126 if (!gid_valid(low) || !gid_valid(high) ||
127 (urange[1] < urange[0]) || gid_lt(high, low)) {
128 low = make_kgid(&init_user_ns, 1);
129 high = make_kgid(&init_user_ns, 0);
130 }
131 set_ping_group_range(table, low, high);
132 }
133
134 return ret;
135 }
136
137 static int proc_tcp_congestion_control(ctl_table *ctl, int write,
138 void __user *buffer, size_t *lenp, loff_t *ppos)
139 {
140 char val[TCP_CA_NAME_MAX];
141 ctl_table tbl = {
142 .data = val,
143 .maxlen = TCP_CA_NAME_MAX,
144 };
145 int ret;
146
147 tcp_get_default_congestion_control(val);
148
149 ret = proc_dostring(&tbl, write, buffer, lenp, ppos);
150 if (write && ret == 0)
151 ret = tcp_set_default_congestion_control(val);
152 return ret;
153 }
154
155 static int proc_tcp_available_congestion_control(ctl_table *ctl,
156 int write,
157 void __user *buffer, size_t *lenp,
158 loff_t *ppos)
159 {
160 ctl_table tbl = { .maxlen = TCP_CA_BUF_MAX, };
161 int ret;
162
163 tbl.data = kmalloc(tbl.maxlen, GFP_USER);
164 if (!tbl.data)
165 return -ENOMEM;
166 tcp_get_available_congestion_control(tbl.data, TCP_CA_BUF_MAX);
167 ret = proc_dostring(&tbl, write, buffer, lenp, ppos);
168 kfree(tbl.data);
169 return ret;
170 }
171
172 static int proc_allowed_congestion_control(ctl_table *ctl,
173 int write,
174 void __user *buffer, size_t *lenp,
175 loff_t *ppos)
176 {
177 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
184 tcp_get_allowed_congestion_control(tbl.data, tbl.maxlen);
185 ret = proc_dostring(&tbl, write, buffer, lenp, ppos);
186 if (write && ret == 0)
187 ret = tcp_set_allowed_congestion_control(tbl.data);
188 kfree(tbl.data);
189 return ret;
190 }
191
192 static int ipv4_tcp_mem(ctl_table *ctl, int write,
193 void __user *buffer, size_t *lenp,
194 loff_t *ppos)
195 {
196 int ret;
197 unsigned long vec[3];
198 struct net *net = current->nsproxy->net_ns;
199 #ifdef CONFIG_MEMCG_KMEM
200 struct mem_cgroup *memcg;
201 #endif
202
203 ctl_table tmp = {
204 .data = &vec,
205 .maxlen = sizeof(vec),
206 .mode = ctl->mode,
207 };
208
209 if (!write) {
210 ctl->data = &net->ipv4.sysctl_tcp_mem;
211 return proc_doulongvec_minmax(ctl, write, buffer, lenp, ppos);
212 }
213
214 ret = proc_doulongvec_minmax(&tmp, write, buffer, lenp, ppos);
215 if (ret)
216 return ret;
217
218 #ifdef CONFIG_MEMCG_KMEM
219 rcu_read_lock();
220 memcg = mem_cgroup_from_task(current);
221
222 tcp_prot_mem(memcg, vec[0], 0);
223 tcp_prot_mem(memcg, vec[1], 1);
224 tcp_prot_mem(memcg, vec[2], 2);
225 rcu_read_unlock();
226 #endif
227
228 net->ipv4.sysctl_tcp_mem[0] = vec[0];
229 net->ipv4.sysctl_tcp_mem[1] = vec[1];
230 net->ipv4.sysctl_tcp_mem[2] = vec[2];
231
232 return 0;
233 }
234
235 int proc_tcp_fastopen_key(ctl_table *ctl, int write, void __user *buffer,
236 size_t *lenp, loff_t *ppos)
237 {
238 ctl_table tbl = { .maxlen = (TCP_FASTOPEN_KEY_LENGTH * 2 + 10) };
239 struct tcp_fastopen_context *ctxt;
240 int ret;
241 u32 user_key[4]; /* 16 bytes, matching TCP_FASTOPEN_KEY_LENGTH */
242
243 tbl.data = kmalloc(tbl.maxlen, GFP_KERNEL);
244 if (!tbl.data)
245 return -ENOMEM;
246
247 rcu_read_lock();
248 ctxt = rcu_dereference(tcp_fastopen_ctx);
249 if (ctxt)
250 memcpy(user_key, ctxt->key, TCP_FASTOPEN_KEY_LENGTH);
251 else
252 memset(user_key, 0, sizeof(user_key));
253 rcu_read_unlock();
254
255 snprintf(tbl.data, tbl.maxlen, "%08x-%08x-%08x-%08x",
256 user_key[0], user_key[1], user_key[2], user_key[3]);
257 ret = proc_dostring(&tbl, write, buffer, lenp, ppos);
258
259 if (write && ret == 0) {
260 if (sscanf(tbl.data, "%x-%x-%x-%x", user_key, user_key + 1,
261 user_key + 2, user_key + 3) != 4) {
262 ret = -EINVAL;
263 goto bad_key;
264 }
265 tcp_fastopen_reset_cipher(user_key, TCP_FASTOPEN_KEY_LENGTH);
266 }
267
268 bad_key:
269 pr_debug("proc FO key set 0x%x-%x-%x-%x <- 0x%s: %u\n",
270 user_key[0], user_key[1], user_key[2], user_key[3],
271 (char *)tbl.data, ret);
272 kfree(tbl.data);
273 return ret;
274 }
275
276 static struct ctl_table ipv4_table[] = {
277 {
278 .procname = "tcp_timestamps",
279 .data = &sysctl_tcp_timestamps,
280 .maxlen = sizeof(int),
281 .mode = 0644,
282 .proc_handler = proc_dointvec
283 },
284 {
285 .procname = "tcp_window_scaling",
286 .data = &sysctl_tcp_window_scaling,
287 .maxlen = sizeof(int),
288 .mode = 0644,
289 .proc_handler = proc_dointvec
290 },
291 {
292 .procname = "tcp_sack",
293 .data = &sysctl_tcp_sack,
294 .maxlen = sizeof(int),
295 .mode = 0644,
296 .proc_handler = proc_dointvec
297 },
298 {
299 .procname = "tcp_retrans_collapse",
300 .data = &sysctl_tcp_retrans_collapse,
301 .maxlen = sizeof(int),
302 .mode = 0644,
303 .proc_handler = proc_dointvec
304 },
305 {
306 .procname = "ip_default_ttl",
307 .data = &sysctl_ip_default_ttl,
308 .maxlen = sizeof(int),
309 .mode = 0644,
310 .proc_handler = proc_dointvec_minmax,
311 .extra1 = &ip_ttl_min,
312 .extra2 = &ip_ttl_max,
313 },
314 {
315 .procname = "ip_no_pmtu_disc",
316 .data = &ipv4_config.no_pmtu_disc,
317 .maxlen = sizeof(int),
318 .mode = 0644,
319 .proc_handler = proc_dointvec
320 },
321 {
322 .procname = "ip_nonlocal_bind",
323 .data = &sysctl_ip_nonlocal_bind,
324 .maxlen = sizeof(int),
325 .mode = 0644,
326 .proc_handler = proc_dointvec
327 },
328 {
329 .procname = "tcp_syn_retries",
330 .data = &sysctl_tcp_syn_retries,
331 .maxlen = sizeof(int),
332 .mode = 0644,
333 .proc_handler = proc_dointvec
334 },
335 {
336 .procname = "tcp_synack_retries",
337 .data = &sysctl_tcp_synack_retries,
338 .maxlen = sizeof(int),
339 .mode = 0644,
340 .proc_handler = proc_dointvec
341 },
342 {
343 .procname = "tcp_max_orphans",
344 .data = &sysctl_tcp_max_orphans,
345 .maxlen = sizeof(int),
346 .mode = 0644,
347 .proc_handler = proc_dointvec
348 },
349 {
350 .procname = "tcp_max_tw_buckets",
351 .data = &tcp_death_row.sysctl_max_tw_buckets,
352 .maxlen = sizeof(int),
353 .mode = 0644,
354 .proc_handler = proc_dointvec
355 },
356 {
357 .procname = "ip_early_demux",
358 .data = &sysctl_ip_early_demux,
359 .maxlen = sizeof(int),
360 .mode = 0644,
361 .proc_handler = proc_dointvec
362 },
363 {
364 .procname = "ip_dynaddr",
365 .data = &sysctl_ip_dynaddr,
366 .maxlen = sizeof(int),
367 .mode = 0644,
368 .proc_handler = proc_dointvec
369 },
370 {
371 .procname = "tcp_keepalive_time",
372 .data = &sysctl_tcp_keepalive_time,
373 .maxlen = sizeof(int),
374 .mode = 0644,
375 .proc_handler = proc_dointvec_jiffies,
376 },
377 {
378 .procname = "tcp_keepalive_probes",
379 .data = &sysctl_tcp_keepalive_probes,
380 .maxlen = sizeof(int),
381 .mode = 0644,
382 .proc_handler = proc_dointvec
383 },
384 {
385 .procname = "tcp_keepalive_intvl",
386 .data = &sysctl_tcp_keepalive_intvl,
387 .maxlen = sizeof(int),
388 .mode = 0644,
389 .proc_handler = proc_dointvec_jiffies,
390 },
391 {
392 .procname = "tcp_retries1",
393 .data = &sysctl_tcp_retries1,
394 .maxlen = sizeof(int),
395 .mode = 0644,
396 .proc_handler = proc_dointvec_minmax,
397 .extra2 = &tcp_retr1_max
398 },
399 {
400 .procname = "tcp_retries2",
401 .data = &sysctl_tcp_retries2,
402 .maxlen = sizeof(int),
403 .mode = 0644,
404 .proc_handler = proc_dointvec
405 },
406 {
407 .procname = "tcp_fin_timeout",
408 .data = &sysctl_tcp_fin_timeout,
409 .maxlen = sizeof(int),
410 .mode = 0644,
411 .proc_handler = proc_dointvec_jiffies,
412 },
413 #ifdef CONFIG_SYN_COOKIES
414 {
415 .procname = "tcp_syncookies",
416 .data = &sysctl_tcp_syncookies,
417 .maxlen = sizeof(int),
418 .mode = 0644,
419 .proc_handler = proc_dointvec
420 },
421 #endif
422 {
423 .procname = "tcp_fastopen",
424 .data = &sysctl_tcp_fastopen,
425 .maxlen = sizeof(int),
426 .mode = 0644,
427 .proc_handler = proc_dointvec,
428 },
429 {
430 .procname = "tcp_fastopen_key",
431 .mode = 0600,
432 .maxlen = ((TCP_FASTOPEN_KEY_LENGTH * 2) + 10),
433 .proc_handler = proc_tcp_fastopen_key,
434 },
435 {
436 .procname = "tcp_tw_recycle",
437 .data = &tcp_death_row.sysctl_tw_recycle,
438 .maxlen = sizeof(int),
439 .mode = 0644,
440 .proc_handler = proc_dointvec
441 },
442 {
443 .procname = "tcp_abort_on_overflow",
444 .data = &sysctl_tcp_abort_on_overflow,
445 .maxlen = sizeof(int),
446 .mode = 0644,
447 .proc_handler = proc_dointvec
448 },
449 {
450 .procname = "tcp_stdurg",
451 .data = &sysctl_tcp_stdurg,
452 .maxlen = sizeof(int),
453 .mode = 0644,
454 .proc_handler = proc_dointvec
455 },
456 {
457 .procname = "tcp_rfc1337",
458 .data = &sysctl_tcp_rfc1337,
459 .maxlen = sizeof(int),
460 .mode = 0644,
461 .proc_handler = proc_dointvec
462 },
463 {
464 .procname = "tcp_max_syn_backlog",
465 .data = &sysctl_max_syn_backlog,
466 .maxlen = sizeof(int),
467 .mode = 0644,
468 .proc_handler = proc_dointvec
469 },
470 {
471 .procname = "ip_local_port_range",
472 .data = &sysctl_local_ports.range,
473 .maxlen = sizeof(sysctl_local_ports.range),
474 .mode = 0644,
475 .proc_handler = ipv4_local_port_range,
476 },
477 {
478 .procname = "ip_local_reserved_ports",
479 .data = NULL, /* initialized in sysctl_ipv4_init */
480 .maxlen = 65536,
481 .mode = 0644,
482 .proc_handler = proc_do_large_bitmap,
483 },
484 {
485 .procname = "igmp_max_memberships",
486 .data = &sysctl_igmp_max_memberships,
487 .maxlen = sizeof(int),
488 .mode = 0644,
489 .proc_handler = proc_dointvec
490 },
491 {
492 .procname = "igmp_max_msf",
493 .data = &sysctl_igmp_max_msf,
494 .maxlen = sizeof(int),
495 .mode = 0644,
496 .proc_handler = proc_dointvec
497 },
498 {
499 .procname = "inet_peer_threshold",
500 .data = &inet_peer_threshold,
501 .maxlen = sizeof(int),
502 .mode = 0644,
503 .proc_handler = proc_dointvec
504 },
505 {
506 .procname = "inet_peer_minttl",
507 .data = &inet_peer_minttl,
508 .maxlen = sizeof(int),
509 .mode = 0644,
510 .proc_handler = proc_dointvec_jiffies,
511 },
512 {
513 .procname = "inet_peer_maxttl",
514 .data = &inet_peer_maxttl,
515 .maxlen = sizeof(int),
516 .mode = 0644,
517 .proc_handler = proc_dointvec_jiffies,
518 },
519 {
520 .procname = "tcp_orphan_retries",
521 .data = &sysctl_tcp_orphan_retries,
522 .maxlen = sizeof(int),
523 .mode = 0644,
524 .proc_handler = proc_dointvec
525 },
526 {
527 .procname = "tcp_fack",
528 .data = &sysctl_tcp_fack,
529 .maxlen = sizeof(int),
530 .mode = 0644,
531 .proc_handler = proc_dointvec
532 },
533 {
534 .procname = "tcp_reordering",
535 .data = &sysctl_tcp_reordering,
536 .maxlen = sizeof(int),
537 .mode = 0644,
538 .proc_handler = proc_dointvec
539 },
540 {
541 .procname = "tcp_ecn",
542 .data = &sysctl_tcp_ecn,
543 .maxlen = sizeof(int),
544 .mode = 0644,
545 .proc_handler = proc_dointvec
546 },
547 {
548 .procname = "tcp_dsack",
549 .data = &sysctl_tcp_dsack,
550 .maxlen = sizeof(int),
551 .mode = 0644,
552 .proc_handler = proc_dointvec
553 },
554 {
555 .procname = "tcp_wmem",
556 .data = &sysctl_tcp_wmem,
557 .maxlen = sizeof(sysctl_tcp_wmem),
558 .mode = 0644,
559 .proc_handler = proc_dointvec
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
567 },
568 {
569 .procname = "tcp_app_win",
570 .data = &sysctl_tcp_app_win,
571 .maxlen = sizeof(int),
572 .mode = 0644,
573 .proc_handler = proc_dointvec
574 },
575 {
576 .procname = "tcp_adv_win_scale",
577 .data = &sysctl_tcp_adv_win_scale,
578 .maxlen = sizeof(int),
579 .mode = 0644,
580 .proc_handler = proc_dointvec_minmax,
581 .extra1 = &tcp_adv_win_scale_min,
582 .extra2 = &tcp_adv_win_scale_max,
583 },
584 {
585 .procname = "tcp_tw_reuse",
586 .data = &sysctl_tcp_tw_reuse,
587 .maxlen = sizeof(int),
588 .mode = 0644,
589 .proc_handler = proc_dointvec
590 },
591 {
592 .procname = "tcp_frto",
593 .data = &sysctl_tcp_frto,
594 .maxlen = sizeof(int),
595 .mode = 0644,
596 .proc_handler = proc_dointvec
597 },
598 {
599 .procname = "tcp_frto_response",
600 .data = &sysctl_tcp_frto_response,
601 .maxlen = sizeof(int),
602 .mode = 0644,
603 .proc_handler = proc_dointvec
604 },
605 {
606 .procname = "tcp_low_latency",
607 .data = &sysctl_tcp_low_latency,
608 .maxlen = sizeof(int),
609 .mode = 0644,
610 .proc_handler = proc_dointvec
611 },
612 {
613 .procname = "tcp_no_metrics_save",
614 .data = &sysctl_tcp_nometrics_save,
615 .maxlen = sizeof(int),
616 .mode = 0644,
617 .proc_handler = proc_dointvec,
618 },
619 {
620 .procname = "tcp_moderate_rcvbuf",
621 .data = &sysctl_tcp_moderate_rcvbuf,
622 .maxlen = sizeof(int),
623 .mode = 0644,
624 .proc_handler = proc_dointvec,
625 },
626 {
627 .procname = "tcp_tso_win_divisor",
628 .data = &sysctl_tcp_tso_win_divisor,
629 .maxlen = sizeof(int),
630 .mode = 0644,
631 .proc_handler = proc_dointvec,
632 },
633 {
634 .procname = "tcp_congestion_control",
635 .mode = 0644,
636 .maxlen = TCP_CA_NAME_MAX,
637 .proc_handler = proc_tcp_congestion_control,
638 },
639 {
640 .procname = "tcp_abc",
641 .data = &sysctl_tcp_abc,
642 .maxlen = sizeof(int),
643 .mode = 0644,
644 .proc_handler = proc_dointvec,
645 },
646 {
647 .procname = "tcp_mtu_probing",
648 .data = &sysctl_tcp_mtu_probing,
649 .maxlen = sizeof(int),
650 .mode = 0644,
651 .proc_handler = proc_dointvec,
652 },
653 {
654 .procname = "tcp_base_mss",
655 .data = &sysctl_tcp_base_mss,
656 .maxlen = sizeof(int),
657 .mode = 0644,
658 .proc_handler = proc_dointvec,
659 },
660 {
661 .procname = "tcp_workaround_signed_windows",
662 .data = &sysctl_tcp_workaround_signed_windows,
663 .maxlen = sizeof(int),
664 .mode = 0644,
665 .proc_handler = proc_dointvec
666 },
667 {
668 .procname = "tcp_limit_output_bytes",
669 .data = &sysctl_tcp_limit_output_bytes,
670 .maxlen = sizeof(int),
671 .mode = 0644,
672 .proc_handler = proc_dointvec
673 },
674 {
675 .procname = "tcp_challenge_ack_limit",
676 .data = &sysctl_tcp_challenge_ack_limit,
677 .maxlen = sizeof(int),
678 .mode = 0644,
679 .proc_handler = proc_dointvec
680 },
681 #ifdef CONFIG_NET_DMA
682 {
683 .procname = "tcp_dma_copybreak",
684 .data = &sysctl_tcp_dma_copybreak,
685 .maxlen = sizeof(int),
686 .mode = 0644,
687 .proc_handler = proc_dointvec
688 },
689 #endif
690 {
691 .procname = "tcp_slow_start_after_idle",
692 .data = &sysctl_tcp_slow_start_after_idle,
693 .maxlen = sizeof(int),
694 .mode = 0644,
695 .proc_handler = proc_dointvec
696 },
697 #ifdef CONFIG_NETLABEL
698 {
699 .procname = "cipso_cache_enable",
700 .data = &cipso_v4_cache_enabled,
701 .maxlen = sizeof(int),
702 .mode = 0644,
703 .proc_handler = proc_dointvec,
704 },
705 {
706 .procname = "cipso_cache_bucket_size",
707 .data = &cipso_v4_cache_bucketsize,
708 .maxlen = sizeof(int),
709 .mode = 0644,
710 .proc_handler = proc_dointvec,
711 },
712 {
713 .procname = "cipso_rbm_optfmt",
714 .data = &cipso_v4_rbm_optfmt,
715 .maxlen = sizeof(int),
716 .mode = 0644,
717 .proc_handler = proc_dointvec,
718 },
719 {
720 .procname = "cipso_rbm_strictvalid",
721 .data = &cipso_v4_rbm_strictvalid,
722 .maxlen = sizeof(int),
723 .mode = 0644,
724 .proc_handler = proc_dointvec,
725 },
726 #endif /* CONFIG_NETLABEL */
727 {
728 .procname = "tcp_available_congestion_control",
729 .maxlen = TCP_CA_BUF_MAX,
730 .mode = 0444,
731 .proc_handler = proc_tcp_available_congestion_control,
732 },
733 {
734 .procname = "tcp_allowed_congestion_control",
735 .maxlen = TCP_CA_BUF_MAX,
736 .mode = 0644,
737 .proc_handler = proc_allowed_congestion_control,
738 },
739 {
740 .procname = "tcp_max_ssthresh",
741 .data = &sysctl_tcp_max_ssthresh,
742 .maxlen = sizeof(int),
743 .mode = 0644,
744 .proc_handler = proc_dointvec,
745 },
746 {
747 .procname = "tcp_cookie_size",
748 .data = &sysctl_tcp_cookie_size,
749 .maxlen = sizeof(int),
750 .mode = 0644,
751 .proc_handler = proc_dointvec
752 },
753 {
754 .procname = "tcp_thin_linear_timeouts",
755 .data = &sysctl_tcp_thin_linear_timeouts,
756 .maxlen = sizeof(int),
757 .mode = 0644,
758 .proc_handler = proc_dointvec
759 },
760 {
761 .procname = "tcp_thin_dupack",
762 .data = &sysctl_tcp_thin_dupack,
763 .maxlen = sizeof(int),
764 .mode = 0644,
765 .proc_handler = proc_dointvec
766 },
767 {
768 .procname = "tcp_early_retrans",
769 .data = &sysctl_tcp_early_retrans,
770 .maxlen = sizeof(int),
771 .mode = 0644,
772 .proc_handler = proc_dointvec_minmax,
773 .extra1 = &zero,
774 .extra2 = &two,
775 },
776 {
777 .procname = "udp_mem",
778 .data = &sysctl_udp_mem,
779 .maxlen = sizeof(sysctl_udp_mem),
780 .mode = 0644,
781 .proc_handler = proc_doulongvec_minmax,
782 },
783 {
784 .procname = "udp_rmem_min",
785 .data = &sysctl_udp_rmem_min,
786 .maxlen = sizeof(sysctl_udp_rmem_min),
787 .mode = 0644,
788 .proc_handler = proc_dointvec_minmax,
789 .extra1 = &zero
790 },
791 {
792 .procname = "udp_wmem_min",
793 .data = &sysctl_udp_wmem_min,
794 .maxlen = sizeof(sysctl_udp_wmem_min),
795 .mode = 0644,
796 .proc_handler = proc_dointvec_minmax,
797 .extra1 = &zero
798 },
799 { }
800 };
801
802 static struct ctl_table ipv4_net_table[] = {
803 {
804 .procname = "icmp_echo_ignore_all",
805 .data = &init_net.ipv4.sysctl_icmp_echo_ignore_all,
806 .maxlen = sizeof(int),
807 .mode = 0644,
808 .proc_handler = proc_dointvec
809 },
810 {
811 .procname = "icmp_echo_ignore_broadcasts",
812 .data = &init_net.ipv4.sysctl_icmp_echo_ignore_broadcasts,
813 .maxlen = sizeof(int),
814 .mode = 0644,
815 .proc_handler = proc_dointvec
816 },
817 {
818 .procname = "icmp_ignore_bogus_error_responses",
819 .data = &init_net.ipv4.sysctl_icmp_ignore_bogus_error_responses,
820 .maxlen = sizeof(int),
821 .mode = 0644,
822 .proc_handler = proc_dointvec
823 },
824 {
825 .procname = "icmp_errors_use_inbound_ifaddr",
826 .data = &init_net.ipv4.sysctl_icmp_errors_use_inbound_ifaddr,
827 .maxlen = sizeof(int),
828 .mode = 0644,
829 .proc_handler = proc_dointvec
830 },
831 {
832 .procname = "icmp_ratelimit",
833 .data = &init_net.ipv4.sysctl_icmp_ratelimit,
834 .maxlen = sizeof(int),
835 .mode = 0644,
836 .proc_handler = proc_dointvec_ms_jiffies,
837 },
838 {
839 .procname = "icmp_ratemask",
840 .data = &init_net.ipv4.sysctl_icmp_ratemask,
841 .maxlen = sizeof(int),
842 .mode = 0644,
843 .proc_handler = proc_dointvec
844 },
845 {
846 .procname = "ping_group_range",
847 .data = &init_net.ipv4.sysctl_ping_group_range,
848 .maxlen = sizeof(gid_t)*2,
849 .mode = 0644,
850 .proc_handler = ipv4_ping_group_range,
851 },
852 {
853 .procname = "tcp_mem",
854 .maxlen = sizeof(init_net.ipv4.sysctl_tcp_mem),
855 .mode = 0644,
856 .proc_handler = ipv4_tcp_mem,
857 },
858 { }
859 };
860
861 static __net_init int ipv4_sysctl_init_net(struct net *net)
862 {
863 struct ctl_table *table;
864
865 table = ipv4_net_table;
866 if (!net_eq(net, &init_net)) {
867 table = kmemdup(table, sizeof(ipv4_net_table), GFP_KERNEL);
868 if (table == NULL)
869 goto err_alloc;
870
871 table[0].data =
872 &net->ipv4.sysctl_icmp_echo_ignore_all;
873 table[1].data =
874 &net->ipv4.sysctl_icmp_echo_ignore_broadcasts;
875 table[2].data =
876 &net->ipv4.sysctl_icmp_ignore_bogus_error_responses;
877 table[3].data =
878 &net->ipv4.sysctl_icmp_errors_use_inbound_ifaddr;
879 table[4].data =
880 &net->ipv4.sysctl_icmp_ratelimit;
881 table[5].data =
882 &net->ipv4.sysctl_icmp_ratemask;
883 table[6].data =
884 &net->ipv4.sysctl_ping_group_range;
885
886 /* Don't export sysctls to unprivileged users */
887 if (net->user_ns != &init_user_ns)
888 table[0].procname = NULL;
889 }
890
891 /*
892 * Sane defaults - nobody may create ping sockets.
893 * Boot scripts should set this to distro-specific group.
894 */
895 net->ipv4.sysctl_ping_group_range[0] = make_kgid(&init_user_ns, 1);
896 net->ipv4.sysctl_ping_group_range[1] = make_kgid(&init_user_ns, 0);
897
898 tcp_init_mem(net);
899
900 net->ipv4.ipv4_hdr = register_net_sysctl(net, "net/ipv4", table);
901 if (net->ipv4.ipv4_hdr == NULL)
902 goto err_reg;
903
904 return 0;
905
906 err_reg:
907 if (!net_eq(net, &init_net))
908 kfree(table);
909 err_alloc:
910 return -ENOMEM;
911 }
912
913 static __net_exit void ipv4_sysctl_exit_net(struct net *net)
914 {
915 struct ctl_table *table;
916
917 table = net->ipv4.ipv4_hdr->ctl_table_arg;
918 unregister_net_sysctl_table(net->ipv4.ipv4_hdr);
919 kfree(table);
920 }
921
922 static __net_initdata struct pernet_operations ipv4_sysctl_ops = {
923 .init = ipv4_sysctl_init_net,
924 .exit = ipv4_sysctl_exit_net,
925 };
926
927 static __init int sysctl_ipv4_init(void)
928 {
929 struct ctl_table_header *hdr;
930 struct ctl_table *i;
931
932 for (i = ipv4_table; i->procname; i++) {
933 if (strcmp(i->procname, "ip_local_reserved_ports") == 0) {
934 i->data = sysctl_local_reserved_ports;
935 break;
936 }
937 }
938 if (!i->procname)
939 return -EINVAL;
940
941 hdr = register_net_sysctl(&init_net, "net/ipv4", ipv4_table);
942 if (hdr == NULL)
943 return -ENOMEM;
944
945 if (register_pernet_subsys(&ipv4_sysctl_ops)) {
946 unregister_net_sysctl_table(hdr);
947 return -ENOMEM;
948 }
949
950 return 0;
951 }
952
953 __initcall(sysctl_ipv4_init);
CRIS linux kernel tree