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[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
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.ip_local_ports.lock);
100
101 *low = data[0];
102 *high = data[1];
103 } while (read_seqretry(&net->ipv4.ip_local_ports.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.ip_local_ports.lock);
113 data[0] = low;
114 data[1] = high;
115 write_sequnlock(&net->ipv4.ip_local_ports.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 (urange[1] < urange[0]) || gid_lt(high, low)) {
145 low = make_kgid(&init_user_ns, 1);
146 high = make_kgid(&init_user_ns, 0);
147 }
148 set_ping_group_range(table, low, high);
149 }
150
151 return ret;
152 }
153
154 static int proc_tcp_congestion_control(struct ctl_table *ctl, int write,
155 void __user *buffer, size_t *lenp, loff_t *ppos)
156 {
157 char val[TCP_CA_NAME_MAX];
158 struct ctl_table tbl = {
159 .data = val,
160 .maxlen = TCP_CA_NAME_MAX,
161 };
162 int ret;
163
164 tcp_get_default_congestion_control(val);
165
166 ret = proc_dostring(&tbl, write, buffer, lenp, ppos);
167 if (write && ret == 0)
168 ret = tcp_set_default_congestion_control(val);
169 return ret;
170 }
171
172 static int proc_tcp_available_congestion_control(struct ctl_table *ctl,
173 int write,
174 void __user *buffer, size_t *lenp,
175 loff_t *ppos)
176 {
177 struct 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 tcp_get_available_congestion_control(tbl.data, TCP_CA_BUF_MAX);
184 ret = proc_dostring(&tbl, write, buffer, lenp, ppos);
185 kfree(tbl.data);
186 return ret;
187 }
188
189 static int proc_allowed_congestion_control(struct ctl_table *ctl,
190 int write,
191 void __user *buffer, size_t *lenp,
192 loff_t *ppos)
193 {
194 struct ctl_table tbl = { .maxlen = TCP_CA_BUF_MAX };
195 int ret;
196
197 tbl.data = kmalloc(tbl.maxlen, GFP_USER);
198 if (!tbl.data)
199 return -ENOMEM;
200
201 tcp_get_allowed_congestion_control(tbl.data, tbl.maxlen);
202 ret = proc_dostring(&tbl, write, buffer, lenp, ppos);
203 if (write && ret == 0)
204 ret = tcp_set_allowed_congestion_control(tbl.data);
205 kfree(tbl.data);
206 return ret;
207 }
208
209 static int proc_tcp_fastopen_key(struct ctl_table *ctl, int write,
210 void __user *buffer, size_t *lenp,
211 loff_t *ppos)
212 {
213 struct ctl_table tbl = { .maxlen = (TCP_FASTOPEN_KEY_LENGTH * 2 + 10) };
214 struct tcp_fastopen_context *ctxt;
215 int ret;
216 u32 user_key[4]; /* 16 bytes, matching TCP_FASTOPEN_KEY_LENGTH */
217
218 tbl.data = kmalloc(tbl.maxlen, GFP_KERNEL);
219 if (!tbl.data)
220 return -ENOMEM;
221
222 rcu_read_lock();
223 ctxt = rcu_dereference(tcp_fastopen_ctx);
224 if (ctxt)
225 memcpy(user_key, ctxt->key, TCP_FASTOPEN_KEY_LENGTH);
226 else
227 memset(user_key, 0, sizeof(user_key));
228 rcu_read_unlock();
229
230 snprintf(tbl.data, tbl.maxlen, "%08x-%08x-%08x-%08x",
231 user_key[0], user_key[1], user_key[2], user_key[3]);
232 ret = proc_dostring(&tbl, write, buffer, lenp, ppos);
233
234 if (write && ret == 0) {
235 if (sscanf(tbl.data, "%x-%x-%x-%x", user_key, user_key + 1,
236 user_key + 2, user_key + 3) != 4) {
237 ret = -EINVAL;
238 goto bad_key;
239 }
240 /* Generate a dummy secret but don't publish it. This
241 * is needed so we don't regenerate a new key on the
242 * first invocation of tcp_fastopen_cookie_gen
243 */
244 tcp_fastopen_init_key_once(false);
245 tcp_fastopen_reset_cipher(user_key, TCP_FASTOPEN_KEY_LENGTH);
246 }
247
248 bad_key:
249 pr_debug("proc FO key set 0x%x-%x-%x-%x <- 0x%s: %u\n",
250 user_key[0], user_key[1], user_key[2], user_key[3],
251 (char *)tbl.data, ret);
252 kfree(tbl.data);
253 return ret;
254 }
255
256 static struct ctl_table ipv4_table[] = {
257 {
258 .procname = "tcp_timestamps",
259 .data = &sysctl_tcp_timestamps,
260 .maxlen = sizeof(int),
261 .mode = 0644,
262 .proc_handler = proc_dointvec
263 },
264 {
265 .procname = "tcp_window_scaling",
266 .data = &sysctl_tcp_window_scaling,
267 .maxlen = sizeof(int),
268 .mode = 0644,
269 .proc_handler = proc_dointvec
270 },
271 {
272 .procname = "tcp_sack",
273 .data = &sysctl_tcp_sack,
274 .maxlen = sizeof(int),
275 .mode = 0644,
276 .proc_handler = proc_dointvec
277 },
278 {
279 .procname = "tcp_retrans_collapse",
280 .data = &sysctl_tcp_retrans_collapse,
281 .maxlen = sizeof(int),
282 .mode = 0644,
283 .proc_handler = proc_dointvec
284 },
285 {
286 .procname = "tcp_max_orphans",
287 .data = &sysctl_tcp_max_orphans,
288 .maxlen = sizeof(int),
289 .mode = 0644,
290 .proc_handler = proc_dointvec
291 },
292 {
293 .procname = "tcp_max_tw_buckets",
294 .data = &tcp_death_row.sysctl_max_tw_buckets,
295 .maxlen = sizeof(int),
296 .mode = 0644,
297 .proc_handler = proc_dointvec
298 },
299 {
300 .procname = "ip_early_demux",
301 .data = &sysctl_ip_early_demux,
302 .maxlen = sizeof(int),
303 .mode = 0644,
304 .proc_handler = proc_dointvec
305 },
306 {
307 .procname = "ip_dynaddr",
308 .data = &sysctl_ip_dynaddr,
309 .maxlen = sizeof(int),
310 .mode = 0644,
311 .proc_handler = proc_dointvec
312 },
313 {
314 .procname = "tcp_fastopen",
315 .data = &sysctl_tcp_fastopen,
316 .maxlen = sizeof(int),
317 .mode = 0644,
318 .proc_handler = proc_dointvec,
319 },
320 {
321 .procname = "tcp_fastopen_key",
322 .mode = 0600,
323 .maxlen = ((TCP_FASTOPEN_KEY_LENGTH * 2) + 10),
324 .proc_handler = proc_tcp_fastopen_key,
325 },
326 {
327 .procname = "tcp_tw_recycle",
328 .data = &tcp_death_row.sysctl_tw_recycle,
329 .maxlen = sizeof(int),
330 .mode = 0644,
331 .proc_handler = proc_dointvec
332 },
333 {
334 .procname = "tcp_abort_on_overflow",
335 .data = &sysctl_tcp_abort_on_overflow,
336 .maxlen = sizeof(int),
337 .mode = 0644,
338 .proc_handler = proc_dointvec
339 },
340 {
341 .procname = "tcp_stdurg",
342 .data = &sysctl_tcp_stdurg,
343 .maxlen = sizeof(int),
344 .mode = 0644,
345 .proc_handler = proc_dointvec
346 },
347 {
348 .procname = "tcp_rfc1337",
349 .data = &sysctl_tcp_rfc1337,
350 .maxlen = sizeof(int),
351 .mode = 0644,
352 .proc_handler = proc_dointvec
353 },
354 {
355 .procname = "tcp_max_syn_backlog",
356 .data = &sysctl_max_syn_backlog,
357 .maxlen = sizeof(int),
358 .mode = 0644,
359 .proc_handler = proc_dointvec
360 },
361 {
362 .procname = "inet_peer_threshold",
363 .data = &inet_peer_threshold,
364 .maxlen = sizeof(int),
365 .mode = 0644,
366 .proc_handler = proc_dointvec
367 },
368 {
369 .procname = "inet_peer_minttl",
370 .data = &inet_peer_minttl,
371 .maxlen = sizeof(int),
372 .mode = 0644,
373 .proc_handler = proc_dointvec_jiffies,
374 },
375 {
376 .procname = "inet_peer_maxttl",
377 .data = &inet_peer_maxttl,
378 .maxlen = sizeof(int),
379 .mode = 0644,
380 .proc_handler = proc_dointvec_jiffies,
381 },
382 {
383 .procname = "tcp_fack",
384 .data = &sysctl_tcp_fack,
385 .maxlen = sizeof(int),
386 .mode = 0644,
387 .proc_handler = proc_dointvec
388 },
389 {
390 .procname = "tcp_recovery",
391 .data = &sysctl_tcp_recovery,
392 .maxlen = sizeof(int),
393 .mode = 0644,
394 .proc_handler = proc_dointvec,
395 },
396 {
397 .procname = "tcp_max_reordering",
398 .data = &sysctl_tcp_max_reordering,
399 .maxlen = sizeof(int),
400 .mode = 0644,
401 .proc_handler = proc_dointvec
402 },
403 {
404 .procname = "tcp_dsack",
405 .data = &sysctl_tcp_dsack,
406 .maxlen = sizeof(int),
407 .mode = 0644,
408 .proc_handler = proc_dointvec
409 },
410 {
411 .procname = "tcp_mem",
412 .maxlen = sizeof(sysctl_tcp_mem),
413 .data = &sysctl_tcp_mem,
414 .mode = 0644,
415 .proc_handler = proc_doulongvec_minmax,
416 },
417 {
418 .procname = "tcp_wmem",
419 .data = &sysctl_tcp_wmem,
420 .maxlen = sizeof(sysctl_tcp_wmem),
421 .mode = 0644,
422 .proc_handler = proc_dointvec_minmax,
423 .extra1 = &one,
424 },
425 {
426 .procname = "tcp_rmem",
427 .data = &sysctl_tcp_rmem,
428 .maxlen = sizeof(sysctl_tcp_rmem),
429 .mode = 0644,
430 .proc_handler = proc_dointvec_minmax,
431 .extra1 = &one,
432 },
433 {
434 .procname = "tcp_app_win",
435 .data = &sysctl_tcp_app_win,
436 .maxlen = sizeof(int),
437 .mode = 0644,
438 .proc_handler = proc_dointvec
439 },
440 {
441 .procname = "tcp_adv_win_scale",
442 .data = &sysctl_tcp_adv_win_scale,
443 .maxlen = sizeof(int),
444 .mode = 0644,
445 .proc_handler = proc_dointvec_minmax,
446 .extra1 = &tcp_adv_win_scale_min,
447 .extra2 = &tcp_adv_win_scale_max,
448 },
449 {
450 .procname = "tcp_tw_reuse",
451 .data = &sysctl_tcp_tw_reuse,
452 .maxlen = sizeof(int),
453 .mode = 0644,
454 .proc_handler = proc_dointvec
455 },
456 {
457 .procname = "tcp_frto",
458 .data = &sysctl_tcp_frto,
459 .maxlen = sizeof(int),
460 .mode = 0644,
461 .proc_handler = proc_dointvec
462 },
463 {
464 .procname = "tcp_min_rtt_wlen",
465 .data = &sysctl_tcp_min_rtt_wlen,
466 .maxlen = sizeof(int),
467 .mode = 0644,
468 .proc_handler = proc_dointvec
469 },
470 {
471 .procname = "tcp_low_latency",
472 .data = &sysctl_tcp_low_latency,
473 .maxlen = sizeof(int),
474 .mode = 0644,
475 .proc_handler = proc_dointvec
476 },
477 {
478 .procname = "tcp_no_metrics_save",
479 .data = &sysctl_tcp_nometrics_save,
480 .maxlen = sizeof(int),
481 .mode = 0644,
482 .proc_handler = proc_dointvec,
483 },
484 {
485 .procname = "tcp_moderate_rcvbuf",
486 .data = &sysctl_tcp_moderate_rcvbuf,
487 .maxlen = sizeof(int),
488 .mode = 0644,
489 .proc_handler = proc_dointvec,
490 },
491 {
492 .procname = "tcp_tso_win_divisor",
493 .data = &sysctl_tcp_tso_win_divisor,
494 .maxlen = sizeof(int),
495 .mode = 0644,
496 .proc_handler = proc_dointvec,
497 },
498 {
499 .procname = "tcp_congestion_control",
500 .mode = 0644,
501 .maxlen = TCP_CA_NAME_MAX,
502 .proc_handler = proc_tcp_congestion_control,
503 },
504 {
505 .procname = "tcp_workaround_signed_windows",
506 .data = &sysctl_tcp_workaround_signed_windows,
507 .maxlen = sizeof(int),
508 .mode = 0644,
509 .proc_handler = proc_dointvec
510 },
511 {
512 .procname = "tcp_limit_output_bytes",
513 .data = &sysctl_tcp_limit_output_bytes,
514 .maxlen = sizeof(int),
515 .mode = 0644,
516 .proc_handler = proc_dointvec
517 },
518 {
519 .procname = "tcp_challenge_ack_limit",
520 .data = &sysctl_tcp_challenge_ack_limit,
521 .maxlen = sizeof(int),
522 .mode = 0644,
523 .proc_handler = proc_dointvec
524 },
525 {
526 .procname = "tcp_slow_start_after_idle",
527 .data = &sysctl_tcp_slow_start_after_idle,
528 .maxlen = sizeof(int),
529 .mode = 0644,
530 .proc_handler = proc_dointvec
531 },
532 #ifdef CONFIG_NETLABEL
533 {
534 .procname = "cipso_cache_enable",
535 .data = &cipso_v4_cache_enabled,
536 .maxlen = sizeof(int),
537 .mode = 0644,
538 .proc_handler = proc_dointvec,
539 },
540 {
541 .procname = "cipso_cache_bucket_size",
542 .data = &cipso_v4_cache_bucketsize,
543 .maxlen = sizeof(int),
544 .mode = 0644,
545 .proc_handler = proc_dointvec,
546 },
547 {
548 .procname = "cipso_rbm_optfmt",
549 .data = &cipso_v4_rbm_optfmt,
550 .maxlen = sizeof(int),
551 .mode = 0644,
552 .proc_handler = proc_dointvec,
553 },
554 {
555 .procname = "cipso_rbm_strictvalid",
556 .data = &cipso_v4_rbm_strictvalid,
557 .maxlen = sizeof(int),
558 .mode = 0644,
559 .proc_handler = proc_dointvec,
560 },
561 #endif /* CONFIG_NETLABEL */
562 {
563 .procname = "tcp_available_congestion_control",
564 .maxlen = TCP_CA_BUF_MAX,
565 .mode = 0444,
566 .proc_handler = proc_tcp_available_congestion_control,
567 },
568 {
569 .procname = "tcp_allowed_congestion_control",
570 .maxlen = TCP_CA_BUF_MAX,
571 .mode = 0644,
572 .proc_handler = proc_allowed_congestion_control,
573 },
574 {
575 .procname = "tcp_thin_linear_timeouts",
576 .data = &sysctl_tcp_thin_linear_timeouts,
577 .maxlen = sizeof(int),
578 .mode = 0644,
579 .proc_handler = proc_dointvec
580 },
581 {
582 .procname = "tcp_thin_dupack",
583 .data = &sysctl_tcp_thin_dupack,
584 .maxlen = sizeof(int),
585 .mode = 0644,
586 .proc_handler = proc_dointvec
587 },
588 {
589 .procname = "tcp_early_retrans",
590 .data = &sysctl_tcp_early_retrans,
591 .maxlen = sizeof(int),
592 .mode = 0644,
593 .proc_handler = proc_dointvec_minmax,
594 .extra1 = &zero,
595 .extra2 = &four,
596 },
597 {
598 .procname = "tcp_min_tso_segs",
599 .data = &sysctl_tcp_min_tso_segs,
600 .maxlen = sizeof(int),
601 .mode = 0644,
602 .proc_handler = proc_dointvec_minmax,
603 .extra1 = &one,
604 .extra2 = &gso_max_segs,
605 },
606 {
607 .procname = "tcp_pacing_ss_ratio",
608 .data = &sysctl_tcp_pacing_ss_ratio,
609 .maxlen = sizeof(int),
610 .mode = 0644,
611 .proc_handler = proc_dointvec_minmax,
612 .extra1 = &zero,
613 .extra2 = &thousand,
614 },
615 {
616 .procname = "tcp_pacing_ca_ratio",
617 .data = &sysctl_tcp_pacing_ca_ratio,
618 .maxlen = sizeof(int),
619 .mode = 0644,
620 .proc_handler = proc_dointvec_minmax,
621 .extra1 = &zero,
622 .extra2 = &thousand,
623 },
624 {
625 .procname = "tcp_autocorking",
626 .data = &sysctl_tcp_autocorking,
627 .maxlen = sizeof(int),
628 .mode = 0644,
629 .proc_handler = proc_dointvec_minmax,
630 .extra1 = &zero,
631 .extra2 = &one,
632 },
633 {
634 .procname = "tcp_invalid_ratelimit",
635 .data = &sysctl_tcp_invalid_ratelimit,
636 .maxlen = sizeof(int),
637 .mode = 0644,
638 .proc_handler = proc_dointvec_ms_jiffies,
639 },
640 {
641 .procname = "icmp_msgs_per_sec",
642 .data = &sysctl_icmp_msgs_per_sec,
643 .maxlen = sizeof(int),
644 .mode = 0644,
645 .proc_handler = proc_dointvec_minmax,
646 .extra1 = &zero,
647 },
648 {
649 .procname = "icmp_msgs_burst",
650 .data = &sysctl_icmp_msgs_burst,
651 .maxlen = sizeof(int),
652 .mode = 0644,
653 .proc_handler = proc_dointvec_minmax,
654 .extra1 = &zero,
655 },
656 {
657 .procname = "udp_mem",
658 .data = &sysctl_udp_mem,
659 .maxlen = sizeof(sysctl_udp_mem),
660 .mode = 0644,
661 .proc_handler = proc_doulongvec_minmax,
662 },
663 {
664 .procname = "udp_rmem_min",
665 .data = &sysctl_udp_rmem_min,
666 .maxlen = sizeof(sysctl_udp_rmem_min),
667 .mode = 0644,
668 .proc_handler = proc_dointvec_minmax,
669 .extra1 = &one
670 },
671 {
672 .procname = "udp_wmem_min",
673 .data = &sysctl_udp_wmem_min,
674 .maxlen = sizeof(sysctl_udp_wmem_min),
675 .mode = 0644,
676 .proc_handler = proc_dointvec_minmax,
677 .extra1 = &one
678 },
679 { }
680 };
681
682 static struct ctl_table ipv4_net_table[] = {
683 {
684 .procname = "icmp_echo_ignore_all",
685 .data = &init_net.ipv4.sysctl_icmp_echo_ignore_all,
686 .maxlen = sizeof(int),
687 .mode = 0644,
688 .proc_handler = proc_dointvec
689 },
690 {
691 .procname = "icmp_echo_ignore_broadcasts",
692 .data = &init_net.ipv4.sysctl_icmp_echo_ignore_broadcasts,
693 .maxlen = sizeof(int),
694 .mode = 0644,
695 .proc_handler = proc_dointvec
696 },
697 {
698 .procname = "icmp_ignore_bogus_error_responses",
699 .data = &init_net.ipv4.sysctl_icmp_ignore_bogus_error_responses,
700 .maxlen = sizeof(int),
701 .mode = 0644,
702 .proc_handler = proc_dointvec
703 },
704 {
705 .procname = "icmp_errors_use_inbound_ifaddr",
706 .data = &init_net.ipv4.sysctl_icmp_errors_use_inbound_ifaddr,
707 .maxlen = sizeof(int),
708 .mode = 0644,
709 .proc_handler = proc_dointvec
710 },
711 {
712 .procname = "icmp_ratelimit",
713 .data = &init_net.ipv4.sysctl_icmp_ratelimit,
714 .maxlen = sizeof(int),
715 .mode = 0644,
716 .proc_handler = proc_dointvec_ms_jiffies,
717 },
718 {
719 .procname = "icmp_ratemask",
720 .data = &init_net.ipv4.sysctl_icmp_ratemask,
721 .maxlen = sizeof(int),
722 .mode = 0644,
723 .proc_handler = proc_dointvec
724 },
725 {
726 .procname = "ping_group_range",
727 .data = &init_net.ipv4.ping_group_range.range,
728 .maxlen = sizeof(gid_t)*2,
729 .mode = 0644,
730 .proc_handler = ipv4_ping_group_range,
731 },
732 {
733 .procname = "tcp_ecn",
734 .data = &init_net.ipv4.sysctl_tcp_ecn,
735 .maxlen = sizeof(int),
736 .mode = 0644,
737 .proc_handler = proc_dointvec
738 },
739 {
740 .procname = "tcp_ecn_fallback",
741 .data = &init_net.ipv4.sysctl_tcp_ecn_fallback,
742 .maxlen = sizeof(int),
743 .mode = 0644,
744 .proc_handler = proc_dointvec
745 },
746 {
747 .procname = "ip_default_ttl",
748 .data = &init_net.ipv4.sysctl_ip_default_ttl,
749 .maxlen = sizeof(int),
750 .mode = 0644,
751 .proc_handler = proc_dointvec_minmax,
752 .extra1 = &ip_ttl_min,
753 .extra2 = &ip_ttl_max,
754 },
755 {
756 .procname = "ip_local_port_range",
757 .maxlen = sizeof(init_net.ipv4.ip_local_ports.range),
758 .data = &init_net.ipv4.ip_local_ports.range,
759 .mode = 0644,
760 .proc_handler = ipv4_local_port_range,
761 },
762 {
763 .procname = "ip_local_reserved_ports",
764 .data = &init_net.ipv4.sysctl_local_reserved_ports,
765 .maxlen = 65536,
766 .mode = 0644,
767 .proc_handler = proc_do_large_bitmap,
768 },
769 {
770 .procname = "ip_no_pmtu_disc",
771 .data = &init_net.ipv4.sysctl_ip_no_pmtu_disc,
772 .maxlen = sizeof(int),
773 .mode = 0644,
774 .proc_handler = proc_dointvec
775 },
776 {
777 .procname = "ip_forward_use_pmtu",
778 .data = &init_net.ipv4.sysctl_ip_fwd_use_pmtu,
779 .maxlen = sizeof(int),
780 .mode = 0644,
781 .proc_handler = proc_dointvec,
782 },
783 {
784 .procname = "ip_nonlocal_bind",
785 .data = &init_net.ipv4.sysctl_ip_nonlocal_bind,
786 .maxlen = sizeof(int),
787 .mode = 0644,
788 .proc_handler = proc_dointvec
789 },
790 {
791 .procname = "fwmark_reflect",
792 .data = &init_net.ipv4.sysctl_fwmark_reflect,
793 .maxlen = sizeof(int),
794 .mode = 0644,
795 .proc_handler = proc_dointvec,
796 },
797 {
798 .procname = "tcp_fwmark_accept",
799 .data = &init_net.ipv4.sysctl_tcp_fwmark_accept,
800 .maxlen = sizeof(int),
801 .mode = 0644,
802 .proc_handler = proc_dointvec,
803 },
804 #ifdef CONFIG_NET_L3_MASTER_DEV
805 {
806 .procname = "tcp_l3mdev_accept",
807 .data = &init_net.ipv4.sysctl_tcp_l3mdev_accept,
808 .maxlen = sizeof(int),
809 .mode = 0644,
810 .proc_handler = proc_dointvec_minmax,
811 .extra1 = &zero,
812 .extra2 = &one,
813 },
814 #endif
815 {
816 .procname = "tcp_mtu_probing",
817 .data = &init_net.ipv4.sysctl_tcp_mtu_probing,
818 .maxlen = sizeof(int),
819 .mode = 0644,
820 .proc_handler = proc_dointvec,
821 },
822 {
823 .procname = "tcp_base_mss",
824 .data = &init_net.ipv4.sysctl_tcp_base_mss,
825 .maxlen = sizeof(int),
826 .mode = 0644,
827 .proc_handler = proc_dointvec,
828 },
829 {
830 .procname = "tcp_probe_threshold",
831 .data = &init_net.ipv4.sysctl_tcp_probe_threshold,
832 .maxlen = sizeof(int),
833 .mode = 0644,
834 .proc_handler = proc_dointvec,
835 },
836 {
837 .procname = "tcp_probe_interval",
838 .data = &init_net.ipv4.sysctl_tcp_probe_interval,
839 .maxlen = sizeof(int),
840 .mode = 0644,
841 .proc_handler = proc_dointvec,
842 },
843 {
844 .procname = "igmp_link_local_mcast_reports",
845 .data = &init_net.ipv4.sysctl_igmp_llm_reports,
846 .maxlen = sizeof(int),
847 .mode = 0644,
848 .proc_handler = proc_dointvec
849 },
850 {
851 .procname = "igmp_max_memberships",
852 .data = &init_net.ipv4.sysctl_igmp_max_memberships,
853 .maxlen = sizeof(int),
854 .mode = 0644,
855 .proc_handler = proc_dointvec
856 },
857 {
858 .procname = "igmp_max_msf",
859 .data = &init_net.ipv4.sysctl_igmp_max_msf,
860 .maxlen = sizeof(int),
861 .mode = 0644,
862 .proc_handler = proc_dointvec
863 },
864 #ifdef CONFIG_IP_MULTICAST
865 {
866 .procname = "igmp_qrv",
867 .data = &init_net.ipv4.sysctl_igmp_qrv,
868 .maxlen = sizeof(int),
869 .mode = 0644,
870 .proc_handler = proc_dointvec_minmax,
871 .extra1 = &one
872 },
873 #endif
874 {
875 .procname = "tcp_keepalive_time",
876 .data = &init_net.ipv4.sysctl_tcp_keepalive_time,
877 .maxlen = sizeof(int),
878 .mode = 0644,
879 .proc_handler = proc_dointvec_jiffies,
880 },
881 {
882 .procname = "tcp_keepalive_probes",
883 .data = &init_net.ipv4.sysctl_tcp_keepalive_probes,
884 .maxlen = sizeof(int),
885 .mode = 0644,
886 .proc_handler = proc_dointvec
887 },
888 {
889 .procname = "tcp_keepalive_intvl",
890 .data = &init_net.ipv4.sysctl_tcp_keepalive_intvl,
891 .maxlen = sizeof(int),
892 .mode = 0644,
893 .proc_handler = proc_dointvec_jiffies,
894 },
895 {
896 .procname = "tcp_syn_retries",
897 .data = &init_net.ipv4.sysctl_tcp_syn_retries,
898 .maxlen = sizeof(int),
899 .mode = 0644,
900 .proc_handler = proc_dointvec_minmax,
901 .extra1 = &tcp_syn_retries_min,
902 .extra2 = &tcp_syn_retries_max
903 },
904 {
905 .procname = "tcp_synack_retries",
906 .data = &init_net.ipv4.sysctl_tcp_synack_retries,
907 .maxlen = sizeof(int),
908 .mode = 0644,
909 .proc_handler = proc_dointvec
910 },
911 #ifdef CONFIG_SYN_COOKIES
912 {
913 .procname = "tcp_syncookies",
914 .data = &init_net.ipv4.sysctl_tcp_syncookies,
915 .maxlen = sizeof(int),
916 .mode = 0644,
917 .proc_handler = proc_dointvec
918 },
919 #endif
920 {
921 .procname = "tcp_reordering",
922 .data = &init_net.ipv4.sysctl_tcp_reordering,
923 .maxlen = sizeof(int),
924 .mode = 0644,
925 .proc_handler = proc_dointvec
926 },
927 {
928 .procname = "tcp_retries1",
929 .data = &init_net.ipv4.sysctl_tcp_retries1,
930 .maxlen = sizeof(int),
931 .mode = 0644,
932 .proc_handler = proc_dointvec_minmax,
933 .extra2 = &tcp_retr1_max
934 },
935 {
936 .procname = "tcp_retries2",
937 .data = &init_net.ipv4.sysctl_tcp_retries2,
938 .maxlen = sizeof(int),
939 .mode = 0644,
940 .proc_handler = proc_dointvec
941 },
942 {
943 .procname = "tcp_orphan_retries",
944 .data = &init_net.ipv4.sysctl_tcp_orphan_retries,
945 .maxlen = sizeof(int),
946 .mode = 0644,
947 .proc_handler = proc_dointvec
948 },
949 {
950 .procname = "tcp_fin_timeout",
951 .data = &init_net.ipv4.sysctl_tcp_fin_timeout,
952 .maxlen = sizeof(int),
953 .mode = 0644,
954 .proc_handler = proc_dointvec_jiffies,
955 },
956 {
957 .procname = "tcp_notsent_lowat",
958 .data = &init_net.ipv4.sysctl_tcp_notsent_lowat,
959 .maxlen = sizeof(unsigned int),
960 .mode = 0644,
961 .proc_handler = proc_dointvec,
962 },
963 { }
964 };
965
966 static __net_init int ipv4_sysctl_init_net(struct net *net)
967 {
968 struct ctl_table *table;
969
970 table = ipv4_net_table;
971 if (!net_eq(net, &init_net)) {
972 int i;
973
974 table = kmemdup(table, sizeof(ipv4_net_table), GFP_KERNEL);
975 if (!table)
976 goto err_alloc;
977
978 /* Update the variables to point into the current struct net */
979 for (i = 0; i < ARRAY_SIZE(ipv4_net_table) - 1; i++)
980 table[i].data += (void *)net - (void *)&init_net;
981 }
982
983 net->ipv4.ipv4_hdr = register_net_sysctl(net, "net/ipv4", table);
984 if (!net->ipv4.ipv4_hdr)
985 goto err_reg;
986
987 net->ipv4.sysctl_local_reserved_ports = kzalloc(65536 / 8, GFP_KERNEL);
988 if (!net->ipv4.sysctl_local_reserved_ports)
989 goto err_ports;
990
991 net->ipv4.sysctl_ip_default_ttl = IPDEFTTL;
992
993 return 0;
994
995 err_ports:
996 unregister_net_sysctl_table(net->ipv4.ipv4_hdr);
997 err_reg:
998 if (!net_eq(net, &init_net))
999 kfree(table);
1000 err_alloc:
1001 return -ENOMEM;
1002 }
1003
1004 static __net_exit void ipv4_sysctl_exit_net(struct net *net)
1005 {
1006 struct ctl_table *table;
1007
1008 kfree(net->ipv4.sysctl_local_reserved_ports);
1009 table = net->ipv4.ipv4_hdr->ctl_table_arg;
1010 unregister_net_sysctl_table(net->ipv4.ipv4_hdr);
1011 kfree(table);
1012 }
1013
1014 static __net_initdata struct pernet_operations ipv4_sysctl_ops = {
1015 .init = ipv4_sysctl_init_net,
1016 .exit = ipv4_sysctl_exit_net,
1017 };
1018
1019 static __init int sysctl_ipv4_init(void)
1020 {
1021 struct ctl_table_header *hdr;
1022
1023 hdr = register_net_sysctl(&init_net, "net/ipv4", ipv4_table);
1024 if (!hdr)
1025 return -ENOMEM;
1026
1027 if (register_pernet_subsys(&ipv4_sysctl_ops)) {
1028 unregister_net_sysctl_table(hdr);
1029 return -ENOMEM;
1030 }
1031
1032 return 0;
1033 }
1034
1035 __initcall(sysctl_ipv4_init);
Linux kernel - Deliverables
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