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ASoC: fsl_esai: fix channel swap issue when stream starts
[linux/fpc-iii.git] / net / ipv4 / sysctl_net_ipv4.c
blob024ab833557d8f2c27ba227e07225f150cc4a18d
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
28 static int zero;
29 static int one = 1;
30 static int four = 4;
31 static int thousand = 1000;
32 static int gso_max_segs = GSO_MAX_SEGS;
33 static int tcp_retr1_max = 255;
34 static int ip_local_port_range_min[] = { 1, 1 };
35 static int ip_local_port_range_max[] = { 65535, 65535 };
36 static int tcp_adv_win_scale_min = -31;
37 static int tcp_adv_win_scale_max = 31;
38 static int ip_ttl_min = 1;
39 static int ip_ttl_max = 255;
40 static int tcp_syn_retries_min = 1;
41 static int tcp_syn_retries_max = MAX_TCP_SYNCNT;
42 static int ip_ping_group_range_min[] = { 0, 0 };
43 static int ip_ping_group_range_max[] = { GID_T_MAX, GID_T_MAX };
44
45 /* Update system visible IP port range */
46 static void set_local_port_range(struct net *net, int range[2])
47 {
48 bool same_parity = !((range[0] ^ range[1]) & 1);
49
50 write_seqlock_bh(&net->ipv4.ip_local_ports.lock);
51 if (same_parity && !net->ipv4.ip_local_ports.warned) {
52 net->ipv4.ip_local_ports.warned = true;
53 pr_err_ratelimited("ip_local_port_range: prefer different parity for start/end values.\n");
54 }
55 net->ipv4.ip_local_ports.range[0] = range[0];
56 net->ipv4.ip_local_ports.range[1] = range[1];
57 write_sequnlock_bh(&net->ipv4.ip_local_ports.lock);
58 }
59
60 /* Validate changes from /proc interface. */
61 static int ipv4_local_port_range(struct ctl_table *table, int write,
62 void __user *buffer,
63 size_t *lenp, loff_t *ppos)
64 {
65 struct net *net =
66 container_of(table->data, struct net, ipv4.ip_local_ports.range);
67 int ret;
68 int range[2];
69 struct ctl_table tmp = {
70 .data = &range,
71 .maxlen = sizeof(range),
72 .mode = table->mode,
73 .extra1 = &ip_local_port_range_min,
74 .extra2 = &ip_local_port_range_max,
75 };
76
77 inet_get_local_port_range(net, &range[0], &range[1]);
78
79 ret = proc_dointvec_minmax(&tmp, write, buffer, lenp, ppos);
80
81 if (write && ret == 0) {
82 if (range[1] < range[0])
83 ret = -EINVAL;
84 else
85 set_local_port_range(net, range);
86 }
87
88 return ret;
89 }
90
91
92 static void inet_get_ping_group_range_table(struct ctl_table *table, kgid_t *low, kgid_t *high)
93 {
94 kgid_t *data = table->data;
95 struct net *net =
96 container_of(table->data, struct net, ipv4.ping_group_range.range);
97 unsigned int seq;
98 do {
99 seq = read_seqbegin(&net->ipv4.ping_group_range.lock);
100
101 *low = data[0];
102 *high = data[1];
103 } while (read_seqretry(&net->ipv4.ping_group_range.lock, seq));
104 }
105
106 /* Update system visible IP port range */
107 static void set_ping_group_range(struct ctl_table *table, kgid_t low, kgid_t high)
108 {
109 kgid_t *data = table->data;
110 struct net *net =
111 container_of(table->data, struct net, ipv4.ping_group_range.range);
112 write_seqlock(&net->ipv4.ping_group_range.lock);
113 data[0] = low;
114 data[1] = high;
115 write_sequnlock(&net->ipv4.ping_group_range.lock);
116 }
117
118 /* Validate changes from /proc interface. */
119 static int ipv4_ping_group_range(struct ctl_table *table, int write,
120 void __user *buffer,
121 size_t *lenp, loff_t *ppos)
122 {
123 struct user_namespace *user_ns = current_user_ns();
124 int ret;
125 gid_t urange[2];
126 kgid_t low, high;
127 struct ctl_table tmp = {
128 .data = &urange,
129 .maxlen = sizeof(urange),
130 .mode = table->mode,
131 .extra1 = &ip_ping_group_range_min,
132 .extra2 = &ip_ping_group_range_max,
133 };
134
135 inet_get_ping_group_range_table(table, &low, &high);
136 urange[0] = from_kgid_munged(user_ns, low);
137 urange[1] = from_kgid_munged(user_ns, high);
138 ret = proc_dointvec_minmax(&tmp, write, buffer, lenp, ppos);
139
140 if (write && ret == 0) {
141 low = make_kgid(user_ns, urange[0]);
142 high = make_kgid(user_ns, urange[1]);
143 if (!gid_valid(low) || !gid_valid(high))
144 return -EINVAL;
145 if (urange[1] < urange[0] || gid_lt(high, low)) {
146 low = make_kgid(&init_user_ns, 1);
147 high = make_kgid(&init_user_ns, 0);
148 }
149 set_ping_group_range(table, low, high);
150 }
151
152 return ret;
153 }
154
155 static int proc_tcp_congestion_control(struct ctl_table *ctl, int write,
156 void __user *buffer, size_t *lenp, loff_t *ppos)
157 {
158 char val[TCP_CA_NAME_MAX];
159 struct ctl_table tbl = {
160 .data = val,
161 .maxlen = TCP_CA_NAME_MAX,
162 };
163 int ret;
164
165 tcp_get_default_congestion_control(val);
166
167 ret = proc_dostring(&tbl, write, buffer, lenp, ppos);
168 if (write && ret == 0)
169 ret = tcp_set_default_congestion_control(val);
170 return ret;
171 }
172
173 static int proc_tcp_available_congestion_control(struct ctl_table *ctl,
174 int write,
175 void __user *buffer, size_t *lenp,
176 loff_t *ppos)
177 {
178 struct 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 tcp_get_available_congestion_control(tbl.data, TCP_CA_BUF_MAX);
185 ret = proc_dostring(&tbl, write, buffer, lenp, ppos);
186 kfree(tbl.data);
187 return ret;
188 }
189
190 static int proc_allowed_congestion_control(struct ctl_table *ctl,
191 int write,
192 void __user *buffer, size_t *lenp,
193 loff_t *ppos)
194 {
195 struct ctl_table tbl = { .maxlen = TCP_CA_BUF_MAX };
196 int ret;
197
198 tbl.data = kmalloc(tbl.maxlen, GFP_USER);
199 if (!tbl.data)
200 return -ENOMEM;
201
202 tcp_get_allowed_congestion_control(tbl.data, tbl.maxlen);
203 ret = proc_dostring(&tbl, write, buffer, lenp, ppos);
204 if (write && ret == 0)
205 ret = tcp_set_allowed_congestion_control(tbl.data);
206 kfree(tbl.data);
207 return ret;
208 }
209
210 static int proc_tcp_fastopen_key(struct ctl_table *ctl, int write,
211 void __user *buffer, size_t *lenp,
212 loff_t *ppos)
213 {
214 struct ctl_table tbl = { .maxlen = (TCP_FASTOPEN_KEY_LENGTH * 2 + 10) };
215 struct tcp_fastopen_context *ctxt;
216 u32 user_key[4]; /* 16 bytes, matching TCP_FASTOPEN_KEY_LENGTH */
217 __le32 key[4];
218 int ret, i;
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(key, ctxt->key, TCP_FASTOPEN_KEY_LENGTH);
228 else
229 memset(key, 0, sizeof(key));
230 rcu_read_unlock();
231
232 for (i = 0; i < ARRAY_SIZE(key); i++)
233 user_key[i] = le32_to_cpu(key[i]);
234
235 snprintf(tbl.data, tbl.maxlen, "%08x-%08x-%08x-%08x",
236 user_key[0], user_key[1], user_key[2], user_key[3]);
237 ret = proc_dostring(&tbl, write, buffer, lenp, ppos);
238
239 if (write && ret == 0) {
240 if (sscanf(tbl.data, "%x-%x-%x-%x", user_key, user_key + 1,
241 user_key + 2, user_key + 3) != 4) {
242 ret = -EINVAL;
243 goto bad_key;
244 }
245 /* Generate a dummy secret but don't publish it. This
246 * is needed so we don't regenerate a new key on the
247 * first invocation of tcp_fastopen_cookie_gen
248 */
249 tcp_fastopen_init_key_once(false);
250
251 for (i = 0; i < ARRAY_SIZE(user_key); i++)
252 key[i] = cpu_to_le32(user_key[i]);
253
254 tcp_fastopen_reset_cipher(key, TCP_FASTOPEN_KEY_LENGTH);
255 }
256
257 bad_key:
258 pr_debug("proc FO key set 0x%x-%x-%x-%x <- 0x%s: %u\n",
259 user_key[0], user_key[1], user_key[2], user_key[3],
260 (char *)tbl.data, ret);
261 kfree(tbl.data);
262 return ret;
263 }
264
265 static struct ctl_table ipv4_table[] = {
266 {
267 .procname = "tcp_timestamps",
268 .data = &sysctl_tcp_timestamps,
269 .maxlen = sizeof(int),
270 .mode = 0644,
271 .proc_handler = proc_dointvec
272 },
273 {
274 .procname = "tcp_window_scaling",
275 .data = &sysctl_tcp_window_scaling,
276 .maxlen = sizeof(int),
277 .mode = 0644,
278 .proc_handler = proc_dointvec
279 },
280 {
281 .procname = "tcp_sack",
282 .data = &sysctl_tcp_sack,
283 .maxlen = sizeof(int),
284 .mode = 0644,
285 .proc_handler = proc_dointvec
286 },
287 {
288 .procname = "tcp_retrans_collapse",
289 .data = &sysctl_tcp_retrans_collapse,
290 .maxlen = sizeof(int),
291 .mode = 0644,
292 .proc_handler = proc_dointvec
293 },
294 {
295 .procname = "tcp_max_orphans",
296 .data = &sysctl_tcp_max_orphans,
297 .maxlen = sizeof(int),
298 .mode = 0644,
299 .proc_handler = proc_dointvec
300 },
301 {
302 .procname = "tcp_max_tw_buckets",
303 .data = &tcp_death_row.sysctl_max_tw_buckets,
304 .maxlen = sizeof(int),
305 .mode = 0644,
306 .proc_handler = proc_dointvec
307 },
308 {
309 .procname = "tcp_fastopen",
310 .data = &sysctl_tcp_fastopen,
311 .maxlen = sizeof(int),
312 .mode = 0644,
313 .proc_handler = proc_dointvec,
314 },
315 {
316 .procname = "tcp_fastopen_key",
317 .mode = 0600,
318 .maxlen = ((TCP_FASTOPEN_KEY_LENGTH * 2) + 10),
319 .proc_handler = proc_tcp_fastopen_key,
320 },
321 {
322 .procname = "tcp_tw_recycle",
323 .data = &tcp_death_row.sysctl_tw_recycle,
324 .maxlen = sizeof(int),
325 .mode = 0644,
326 .proc_handler = proc_dointvec
327 },
328 {
329 .procname = "tcp_abort_on_overflow",
330 .data = &sysctl_tcp_abort_on_overflow,
331 .maxlen = sizeof(int),
332 .mode = 0644,
333 .proc_handler = proc_dointvec
334 },
335 {
336 .procname = "tcp_stdurg",
337 .data = &sysctl_tcp_stdurg,
338 .maxlen = sizeof(int),
339 .mode = 0644,
340 .proc_handler = proc_dointvec
341 },
342 {
343 .procname = "tcp_rfc1337",
344 .data = &sysctl_tcp_rfc1337,
345 .maxlen = sizeof(int),
346 .mode = 0644,
347 .proc_handler = proc_dointvec
348 },
349 {
350 .procname = "tcp_max_syn_backlog",
351 .data = &sysctl_max_syn_backlog,
352 .maxlen = sizeof(int),
353 .mode = 0644,
354 .proc_handler = proc_dointvec
355 },
356 {
357 .procname = "inet_peer_threshold",
358 .data = &inet_peer_threshold,
359 .maxlen = sizeof(int),
360 .mode = 0644,
361 .proc_handler = proc_dointvec
362 },
363 {
364 .procname = "inet_peer_minttl",
365 .data = &inet_peer_minttl,
366 .maxlen = sizeof(int),
367 .mode = 0644,
368 .proc_handler = proc_dointvec_jiffies,
369 },
370 {
371 .procname = "inet_peer_maxttl",
372 .data = &inet_peer_maxttl,
373 .maxlen = sizeof(int),
374 .mode = 0644,
375 .proc_handler = proc_dointvec_jiffies,
376 },
377 {
378 .procname = "tcp_fack",
379 .data = &sysctl_tcp_fack,
380 .maxlen = sizeof(int),
381 .mode = 0644,
382 .proc_handler = proc_dointvec
383 },
384 {
385 .procname = "tcp_recovery",
386 .data = &sysctl_tcp_recovery,
387 .maxlen = sizeof(int),
388 .mode = 0644,
389 .proc_handler = proc_dointvec,
390 },
391 {
392 .procname = "tcp_max_reordering",
393 .data = &sysctl_tcp_max_reordering,
394 .maxlen = sizeof(int),
395 .mode = 0644,
396 .proc_handler = proc_dointvec
397 },
398 {
399 .procname = "tcp_dsack",
400 .data = &sysctl_tcp_dsack,
401 .maxlen = sizeof(int),
402 .mode = 0644,
403 .proc_handler = proc_dointvec
404 },
405 {
406 .procname = "tcp_mem",
407 .maxlen = sizeof(sysctl_tcp_mem),
408 .data = &sysctl_tcp_mem,
409 .mode = 0644,
410 .proc_handler = proc_doulongvec_minmax,
411 },
412 {
413 .procname = "tcp_wmem",
414 .data = &sysctl_tcp_wmem,
415 .maxlen = sizeof(sysctl_tcp_wmem),
416 .mode = 0644,
417 .proc_handler = proc_dointvec_minmax,
418 .extra1 = &one,
419 },
420 {
421 .procname = "tcp_rmem",
422 .data = &sysctl_tcp_rmem,
423 .maxlen = sizeof(sysctl_tcp_rmem),
424 .mode = 0644,
425 .proc_handler = proc_dointvec_minmax,
426 .extra1 = &one,
427 },
428 {
429 .procname = "tcp_app_win",
430 .data = &sysctl_tcp_app_win,
431 .maxlen = sizeof(int),
432 .mode = 0644,
433 .proc_handler = proc_dointvec
434 },
435 {
436 .procname = "tcp_adv_win_scale",
437 .data = &sysctl_tcp_adv_win_scale,
438 .maxlen = sizeof(int),
439 .mode = 0644,
440 .proc_handler = proc_dointvec_minmax,
441 .extra1 = &tcp_adv_win_scale_min,
442 .extra2 = &tcp_adv_win_scale_max,
443 },
444 {
445 .procname = "tcp_tw_reuse",
446 .data = &sysctl_tcp_tw_reuse,
447 .maxlen = sizeof(int),
448 .mode = 0644,
449 .proc_handler = proc_dointvec
450 },
451 {
452 .procname = "tcp_frto",
453 .data = &sysctl_tcp_frto,
454 .maxlen = sizeof(int),
455 .mode = 0644,
456 .proc_handler = proc_dointvec
457 },
458 {
459 .procname = "tcp_min_rtt_wlen",
460 .data = &sysctl_tcp_min_rtt_wlen,
461 .maxlen = sizeof(int),
462 .mode = 0644,
463 .proc_handler = proc_dointvec
464 },
465 {
466 .procname = "tcp_low_latency",
467 .data = &sysctl_tcp_low_latency,
468 .maxlen = sizeof(int),
469 .mode = 0644,
470 .proc_handler = proc_dointvec
471 },
472 {
473 .procname = "tcp_no_metrics_save",
474 .data = &sysctl_tcp_nometrics_save,
475 .maxlen = sizeof(int),
476 .mode = 0644,
477 .proc_handler = proc_dointvec,
478 },
479 {
480 .procname = "tcp_moderate_rcvbuf",
481 .data = &sysctl_tcp_moderate_rcvbuf,
482 .maxlen = sizeof(int),
483 .mode = 0644,
484 .proc_handler = proc_dointvec,
485 },
486 {
487 .procname = "tcp_tso_win_divisor",
488 .data = &sysctl_tcp_tso_win_divisor,
489 .maxlen = sizeof(int),
490 .mode = 0644,
491 .proc_handler = proc_dointvec,
492 },
493 {
494 .procname = "tcp_congestion_control",
495 .mode = 0644,
496 .maxlen = TCP_CA_NAME_MAX,
497 .proc_handler = proc_tcp_congestion_control,
498 },
499 {
500 .procname = "tcp_workaround_signed_windows",
501 .data = &sysctl_tcp_workaround_signed_windows,
502 .maxlen = sizeof(int),
503 .mode = 0644,
504 .proc_handler = proc_dointvec
505 },
506 {
507 .procname = "tcp_limit_output_bytes",
508 .data = &sysctl_tcp_limit_output_bytes,
509 .maxlen = sizeof(int),
510 .mode = 0644,
511 .proc_handler = proc_dointvec
512 },
513 {
514 .procname = "tcp_challenge_ack_limit",
515 .data = &sysctl_tcp_challenge_ack_limit,
516 .maxlen = sizeof(int),
517 .mode = 0644,
518 .proc_handler = proc_dointvec
519 },
520 {
521 .procname = "tcp_slow_start_after_idle",
522 .data = &sysctl_tcp_slow_start_after_idle,
523 .maxlen = sizeof(int),
524 .mode = 0644,
525 .proc_handler = proc_dointvec
526 },
527 #ifdef CONFIG_NETLABEL
528 {
529 .procname = "cipso_cache_enable",
530 .data = &cipso_v4_cache_enabled,
531 .maxlen = sizeof(int),
532 .mode = 0644,
533 .proc_handler = proc_dointvec,
534 },
535 {
536 .procname = "cipso_cache_bucket_size",
537 .data = &cipso_v4_cache_bucketsize,
538 .maxlen = sizeof(int),
539 .mode = 0644,
540 .proc_handler = proc_dointvec,
541 },
542 {
543 .procname = "cipso_rbm_optfmt",
544 .data = &cipso_v4_rbm_optfmt,
545 .maxlen = sizeof(int),
546 .mode = 0644,
547 .proc_handler = proc_dointvec,
548 },
549 {
550 .procname = "cipso_rbm_strictvalid",
551 .data = &cipso_v4_rbm_strictvalid,
552 .maxlen = sizeof(int),
553 .mode = 0644,
554 .proc_handler = proc_dointvec,
555 },
556 #endif /* CONFIG_NETLABEL */
557 {
558 .procname = "tcp_available_congestion_control",
559 .maxlen = TCP_CA_BUF_MAX,
560 .mode = 0444,
561 .proc_handler = proc_tcp_available_congestion_control,
562 },
563 {
564 .procname = "tcp_allowed_congestion_control",
565 .maxlen = TCP_CA_BUF_MAX,
566 .mode = 0644,
567 .proc_handler = proc_allowed_congestion_control,
568 },
569 {
570 .procname = "tcp_thin_linear_timeouts",
571 .data = &sysctl_tcp_thin_linear_timeouts,
572 .maxlen = sizeof(int),
573 .mode = 0644,
574 .proc_handler = proc_dointvec
575 },
576 {
577 .procname = "tcp_thin_dupack",
578 .data = &sysctl_tcp_thin_dupack,
579 .maxlen = sizeof(int),
580 .mode = 0644,
581 .proc_handler = proc_dointvec
582 },
583 {
584 .procname = "tcp_early_retrans",
585 .data = &sysctl_tcp_early_retrans,
586 .maxlen = sizeof(int),
587 .mode = 0644,
588 .proc_handler = proc_dointvec_minmax,
589 .extra1 = &zero,
590 .extra2 = &four,
591 },
592 {
593 .procname = "tcp_min_tso_segs",
594 .data = &sysctl_tcp_min_tso_segs,
595 .maxlen = sizeof(int),
596 .mode = 0644,
597 .proc_handler = proc_dointvec_minmax,
598 .extra1 = &one,
599 .extra2 = &gso_max_segs,
600 },
601 {
602 .procname = "tcp_pacing_ss_ratio",
603 .data = &sysctl_tcp_pacing_ss_ratio,
604 .maxlen = sizeof(int),
605 .mode = 0644,
606 .proc_handler = proc_dointvec_minmax,
607 .extra1 = &zero,
608 .extra2 = &thousand,
609 },
610 {
611 .procname = "tcp_pacing_ca_ratio",
612 .data = &sysctl_tcp_pacing_ca_ratio,
613 .maxlen = sizeof(int),
614 .mode = 0644,
615 .proc_handler = proc_dointvec_minmax,
616 .extra1 = &zero,
617 .extra2 = &thousand,
618 },
619 {
620 .procname = "tcp_autocorking",
621 .data = &sysctl_tcp_autocorking,
622 .maxlen = sizeof(int),
623 .mode = 0644,
624 .proc_handler = proc_dointvec_minmax,
625 .extra1 = &zero,
626 .extra2 = &one,
627 },
628 {
629 .procname = "tcp_invalid_ratelimit",
630 .data = &sysctl_tcp_invalid_ratelimit,
631 .maxlen = sizeof(int),
632 .mode = 0644,
633 .proc_handler = proc_dointvec_ms_jiffies,
634 },
635 {
636 .procname = "icmp_msgs_per_sec",
637 .data = &sysctl_icmp_msgs_per_sec,
638 .maxlen = sizeof(int),
639 .mode = 0644,
640 .proc_handler = proc_dointvec_minmax,
641 .extra1 = &zero,
642 },
643 {
644 .procname = "icmp_msgs_burst",
645 .data = &sysctl_icmp_msgs_burst,
646 .maxlen = sizeof(int),
647 .mode = 0644,
648 .proc_handler = proc_dointvec_minmax,
649 .extra1 = &zero,
650 },
651 {
652 .procname = "udp_mem",
653 .data = &sysctl_udp_mem,
654 .maxlen = sizeof(sysctl_udp_mem),
655 .mode = 0644,
656 .proc_handler = proc_doulongvec_minmax,
657 },
658 {
659 .procname = "udp_rmem_min",
660 .data = &sysctl_udp_rmem_min,
661 .maxlen = sizeof(sysctl_udp_rmem_min),
662 .mode = 0644,
663 .proc_handler = proc_dointvec_minmax,
664 .extra1 = &one
665 },
666 {
667 .procname = "udp_wmem_min",
668 .data = &sysctl_udp_wmem_min,
669 .maxlen = sizeof(sysctl_udp_wmem_min),
670 .mode = 0644,
671 .proc_handler = proc_dointvec_minmax,
672 .extra1 = &one
673 },
674 { }
675 };
676
677 static struct ctl_table ipv4_net_table[] = {
678 {
679 .procname = "icmp_echo_ignore_all",
680 .data = &init_net.ipv4.sysctl_icmp_echo_ignore_all,
681 .maxlen = sizeof(int),
682 .mode = 0644,
683 .proc_handler = proc_dointvec
684 },
685 {
686 .procname = "icmp_echo_ignore_broadcasts",
687 .data = &init_net.ipv4.sysctl_icmp_echo_ignore_broadcasts,
688 .maxlen = sizeof(int),
689 .mode = 0644,
690 .proc_handler = proc_dointvec
691 },
692 {
693 .procname = "icmp_ignore_bogus_error_responses",
694 .data = &init_net.ipv4.sysctl_icmp_ignore_bogus_error_responses,
695 .maxlen = sizeof(int),
696 .mode = 0644,
697 .proc_handler = proc_dointvec
698 },
699 {
700 .procname = "icmp_errors_use_inbound_ifaddr",
701 .data = &init_net.ipv4.sysctl_icmp_errors_use_inbound_ifaddr,
702 .maxlen = sizeof(int),
703 .mode = 0644,
704 .proc_handler = proc_dointvec
705 },
706 {
707 .procname = "icmp_ratelimit",
708 .data = &init_net.ipv4.sysctl_icmp_ratelimit,
709 .maxlen = sizeof(int),
710 .mode = 0644,
711 .proc_handler = proc_dointvec_ms_jiffies,
712 },
713 {
714 .procname = "icmp_ratemask",
715 .data = &init_net.ipv4.sysctl_icmp_ratemask,
716 .maxlen = sizeof(int),
717 .mode = 0644,
718 .proc_handler = proc_dointvec
719 },
720 {
721 .procname = "ping_group_range",
722 .data = &init_net.ipv4.ping_group_range.range,
723 .maxlen = sizeof(gid_t)*2,
724 .mode = 0644,
725 .proc_handler = ipv4_ping_group_range,
726 },
727 {
728 .procname = "tcp_ecn",
729 .data = &init_net.ipv4.sysctl_tcp_ecn,
730 .maxlen = sizeof(int),
731 .mode = 0644,
732 .proc_handler = proc_dointvec
733 },
734 {
735 .procname = "tcp_ecn_fallback",
736 .data = &init_net.ipv4.sysctl_tcp_ecn_fallback,
737 .maxlen = sizeof(int),
738 .mode = 0644,
739 .proc_handler = proc_dointvec
740 },
741 {
742 .procname = "ip_dynaddr",
743 .data = &init_net.ipv4.sysctl_ip_dynaddr,
744 .maxlen = sizeof(int),
745 .mode = 0644,
746 .proc_handler = proc_dointvec
747 },
748 {
749 .procname = "ip_early_demux",
750 .data = &init_net.ipv4.sysctl_ip_early_demux,
751 .maxlen = sizeof(int),
752 .mode = 0644,
753 .proc_handler = proc_dointvec
754 },
755 {
756 .procname = "ip_default_ttl",
757 .data = &init_net.ipv4.sysctl_ip_default_ttl,
758 .maxlen = sizeof(int),
759 .mode = 0644,
760 .proc_handler = proc_dointvec_minmax,
761 .extra1 = &ip_ttl_min,
762 .extra2 = &ip_ttl_max,
763 },
764 {
765 .procname = "ip_local_port_range",
766 .maxlen = sizeof(init_net.ipv4.ip_local_ports.range),
767 .data = &init_net.ipv4.ip_local_ports.range,
768 .mode = 0644,
769 .proc_handler = ipv4_local_port_range,
770 },
771 {
772 .procname = "ip_local_reserved_ports",
773 .data = &init_net.ipv4.sysctl_local_reserved_ports,
774 .maxlen = 65536,
775 .mode = 0644,
776 .proc_handler = proc_do_large_bitmap,
777 },
778 {
779 .procname = "ip_no_pmtu_disc",
780 .data = &init_net.ipv4.sysctl_ip_no_pmtu_disc,
781 .maxlen = sizeof(int),
782 .mode = 0644,
783 .proc_handler = proc_dointvec
784 },
785 {
786 .procname = "ip_forward_use_pmtu",
787 .data = &init_net.ipv4.sysctl_ip_fwd_use_pmtu,
788 .maxlen = sizeof(int),
789 .mode = 0644,
790 .proc_handler = proc_dointvec,
791 },
792 {
793 .procname = "ip_nonlocal_bind",
794 .data = &init_net.ipv4.sysctl_ip_nonlocal_bind,
795 .maxlen = sizeof(int),
796 .mode = 0644,
797 .proc_handler = proc_dointvec
798 },
799 {
800 .procname = "fwmark_reflect",
801 .data = &init_net.ipv4.sysctl_fwmark_reflect,
802 .maxlen = sizeof(int),
803 .mode = 0644,
804 .proc_handler = proc_dointvec,
805 },
806 {
807 .procname = "tcp_fwmark_accept",
808 .data = &init_net.ipv4.sysctl_tcp_fwmark_accept,
809 .maxlen = sizeof(int),
810 .mode = 0644,
811 .proc_handler = proc_dointvec,
812 },
813 #ifdef CONFIG_NET_L3_MASTER_DEV
814 {
815 .procname = "tcp_l3mdev_accept",
816 .data = &init_net.ipv4.sysctl_tcp_l3mdev_accept,
817 .maxlen = sizeof(int),
818 .mode = 0644,
819 .proc_handler = proc_dointvec_minmax,
820 .extra1 = &zero,
821 .extra2 = &one,
822 },
823 #endif
824 {
825 .procname = "tcp_mtu_probing",
826 .data = &init_net.ipv4.sysctl_tcp_mtu_probing,
827 .maxlen = sizeof(int),
828 .mode = 0644,
829 .proc_handler = proc_dointvec,
830 },
831 {
832 .procname = "tcp_base_mss",
833 .data = &init_net.ipv4.sysctl_tcp_base_mss,
834 .maxlen = sizeof(int),
835 .mode = 0644,
836 .proc_handler = proc_dointvec,
837 },
838 {
839 .procname = "tcp_probe_threshold",
840 .data = &init_net.ipv4.sysctl_tcp_probe_threshold,
841 .maxlen = sizeof(int),
842 .mode = 0644,
843 .proc_handler = proc_dointvec,
844 },
845 {
846 .procname = "tcp_probe_interval",
847 .data = &init_net.ipv4.sysctl_tcp_probe_interval,
848 .maxlen = sizeof(int),
849 .mode = 0644,
850 .proc_handler = proc_dointvec,
851 },
852 {
853 .procname = "igmp_link_local_mcast_reports",
854 .data = &init_net.ipv4.sysctl_igmp_llm_reports,
855 .maxlen = sizeof(int),
856 .mode = 0644,
857 .proc_handler = proc_dointvec
858 },
859 {
860 .procname = "igmp_max_memberships",
861 .data = &init_net.ipv4.sysctl_igmp_max_memberships,
862 .maxlen = sizeof(int),
863 .mode = 0644,
864 .proc_handler = proc_dointvec
865 },
866 {
867 .procname = "igmp_max_msf",
868 .data = &init_net.ipv4.sysctl_igmp_max_msf,
869 .maxlen = sizeof(int),
870 .mode = 0644,
871 .proc_handler = proc_dointvec
872 },
873 #ifdef CONFIG_IP_MULTICAST
874 {
875 .procname = "igmp_qrv",
876 .data = &init_net.ipv4.sysctl_igmp_qrv,
877 .maxlen = sizeof(int),
878 .mode = 0644,
879 .proc_handler = proc_dointvec_minmax,
880 .extra1 = &one
881 },
882 #endif
883 {
884 .procname = "tcp_keepalive_time",
885 .data = &init_net.ipv4.sysctl_tcp_keepalive_time,
886 .maxlen = sizeof(int),
887 .mode = 0644,
888 .proc_handler = proc_dointvec_jiffies,
889 },
890 {
891 .procname = "tcp_keepalive_probes",
892 .data = &init_net.ipv4.sysctl_tcp_keepalive_probes,
893 .maxlen = sizeof(int),
894 .mode = 0644,
895 .proc_handler = proc_dointvec
896 },
897 {
898 .procname = "tcp_keepalive_intvl",
899 .data = &init_net.ipv4.sysctl_tcp_keepalive_intvl,
900 .maxlen = sizeof(int),
901 .mode = 0644,
902 .proc_handler = proc_dointvec_jiffies,
903 },
904 {
905 .procname = "tcp_syn_retries",
906 .data = &init_net.ipv4.sysctl_tcp_syn_retries,
907 .maxlen = sizeof(int),
908 .mode = 0644,
909 .proc_handler = proc_dointvec_minmax,
910 .extra1 = &tcp_syn_retries_min,
911 .extra2 = &tcp_syn_retries_max
912 },
913 {
914 .procname = "tcp_synack_retries",
915 .data = &init_net.ipv4.sysctl_tcp_synack_retries,
916 .maxlen = sizeof(int),
917 .mode = 0644,
918 .proc_handler = proc_dointvec
919 },
920 #ifdef CONFIG_SYN_COOKIES
921 {
922 .procname = "tcp_syncookies",
923 .data = &init_net.ipv4.sysctl_tcp_syncookies,
924 .maxlen = sizeof(int),
925 .mode = 0644,
926 .proc_handler = proc_dointvec
927 },
928 #endif
929 {
930 .procname = "tcp_reordering",
931 .data = &init_net.ipv4.sysctl_tcp_reordering,
932 .maxlen = sizeof(int),
933 .mode = 0644,
934 .proc_handler = proc_dointvec
935 },
936 {
937 .procname = "tcp_retries1",
938 .data = &init_net.ipv4.sysctl_tcp_retries1,
939 .maxlen = sizeof(int),
940 .mode = 0644,
941 .proc_handler = proc_dointvec_minmax,
942 .extra2 = &tcp_retr1_max
943 },
944 {
945 .procname = "tcp_retries2",
946 .data = &init_net.ipv4.sysctl_tcp_retries2,
947 .maxlen = sizeof(int),
948 .mode = 0644,
949 .proc_handler = proc_dointvec
950 },
951 {
952 .procname = "tcp_orphan_retries",
953 .data = &init_net.ipv4.sysctl_tcp_orphan_retries,
954 .maxlen = sizeof(int),
955 .mode = 0644,
956 .proc_handler = proc_dointvec
957 },
958 {
959 .procname = "tcp_fin_timeout",
960 .data = &init_net.ipv4.sysctl_tcp_fin_timeout,
961 .maxlen = sizeof(int),
962 .mode = 0644,
963 .proc_handler = proc_dointvec_jiffies,
964 },
965 {
966 .procname = "tcp_notsent_lowat",
967 .data = &init_net.ipv4.sysctl_tcp_notsent_lowat,
968 .maxlen = sizeof(unsigned int),
969 .mode = 0644,
970 .proc_handler = proc_douintvec,
971 },
972 #ifdef CONFIG_IP_ROUTE_MULTIPATH
973 {
974 .procname = "fib_multipath_use_neigh",
975 .data = &init_net.ipv4.sysctl_fib_multipath_use_neigh,
976 .maxlen = sizeof(int),
977 .mode = 0644,
978 .proc_handler = proc_dointvec_minmax,
979 .extra1 = &zero,
980 .extra2 = &one,
981 },
982 #endif
983 { }
984 };
985
986 static __net_init int ipv4_sysctl_init_net(struct net *net)
987 {
988 struct ctl_table *table;
989
990 table = ipv4_net_table;
991 if (!net_eq(net, &init_net)) {
992 int i;
993
994 table = kmemdup(table, sizeof(ipv4_net_table), GFP_KERNEL);
995 if (!table)
996 goto err_alloc;
997
998 /* Update the variables to point into the current struct net */
999 for (i = 0; i < ARRAY_SIZE(ipv4_net_table) - 1; i++)
1000 table[i].data += (void *)net - (void *)&init_net;
1001 }
1002
1003 net->ipv4.ipv4_hdr = register_net_sysctl(net, "net/ipv4", table);
1004 if (!net->ipv4.ipv4_hdr)
1005 goto err_reg;
1006
1007 net->ipv4.sysctl_local_reserved_ports = kzalloc(65536 / 8, GFP_KERNEL);
1008 if (!net->ipv4.sysctl_local_reserved_ports)
1009 goto err_ports;
1010
1011 return 0;
1012
1013 err_ports:
1014 unregister_net_sysctl_table(net->ipv4.ipv4_hdr);
1015 err_reg:
1016 if (!net_eq(net, &init_net))
1017 kfree(table);
1018 err_alloc:
1019 return -ENOMEM;
1020 }
1021
1022 static __net_exit void ipv4_sysctl_exit_net(struct net *net)
1023 {
1024 struct ctl_table *table;
1025
1026 kfree(net->ipv4.sysctl_local_reserved_ports);
1027 table = net->ipv4.ipv4_hdr->ctl_table_arg;
1028 unregister_net_sysctl_table(net->ipv4.ipv4_hdr);
1029 kfree(table);
1030 }
1031
1032 static __net_initdata struct pernet_operations ipv4_sysctl_ops = {
1033 .init = ipv4_sysctl_init_net,
1034 .exit = ipv4_sysctl_exit_net,
1035 };
1036
1037 static __init int sysctl_ipv4_init(void)
1038 {
1039 struct ctl_table_header *hdr;
1040
1041 hdr = register_net_sysctl(&init_net, "net/ipv4", ipv4_table);
1042 if (!hdr)
1043 return -ENOMEM;
1044
1045 if (register_pernet_subsys(&ipv4_sysctl_ops)) {
1046 unregister_net_sysctl_table(hdr);
1047 return -ENOMEM;
1048 }
1049
1050 return 0;
1051 }
1052
1053 __initcall(sysctl_ipv4_init);
Linux with added FPC-III support