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sched/fair: Fix comments
[linux/fpc-iii.git] / net / ipv4 / sysctl_net_ipv4.c
blobd6880a6149ee80c6c75f4fe75b46a9d18d204d5d
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_privileged_port_min;
39 static int ip_privileged_port_max = 65535;
40 static int ip_ttl_min = 1;
41 static int ip_ttl_max = 255;
42 static int tcp_syn_retries_min = 1;
43 static int tcp_syn_retries_max = MAX_TCP_SYNCNT;
44 static int ip_ping_group_range_min[] = { 0, 0 };
45 static int ip_ping_group_range_max[] = { GID_T_MAX, GID_T_MAX };
46
47 /* Update system visible IP port range */
48 static void set_local_port_range(struct net *net, int range[2])
49 {
50 bool same_parity = !((range[0] ^ range[1]) & 1);
51
52 write_seqlock_bh(&net->ipv4.ip_local_ports.lock);
53 if (same_parity && !net->ipv4.ip_local_ports.warned) {
54 net->ipv4.ip_local_ports.warned = true;
55 pr_err_ratelimited("ip_local_port_range: prefer different parity for start/end values.\n");
56 }
57 net->ipv4.ip_local_ports.range[0] = range[0];
58 net->ipv4.ip_local_ports.range[1] = range[1];
59 write_sequnlock_bh(&net->ipv4.ip_local_ports.lock);
60 }
61
62 /* Validate changes from /proc interface. */
63 static int ipv4_local_port_range(struct ctl_table *table, int write,
64 void __user *buffer,
65 size_t *lenp, loff_t *ppos)
66 {
67 struct net *net =
68 container_of(table->data, struct net, ipv4.ip_local_ports.range);
69 int ret;
70 int range[2];
71 struct ctl_table tmp = {
72 .data = &range,
73 .maxlen = sizeof(range),
74 .mode = table->mode,
75 .extra1 = &ip_local_port_range_min,
76 .extra2 = &ip_local_port_range_max,
77 };
78
79 inet_get_local_port_range(net, &range[0], &range[1]);
80
81 ret = proc_dointvec_minmax(&tmp, write, buffer, lenp, ppos);
82
83 if (write && ret == 0) {
84 /* Ensure that the upper limit is not smaller than the lower,
85 * and that the lower does not encroach upon the privileged
86 * port limit.
87 */
88 if ((range[1] < range[0]) ||
89 (range[0] < net->ipv4.sysctl_ip_prot_sock))
90 ret = -EINVAL;
91 else
92 set_local_port_range(net, range);
93 }
94
95 return ret;
96 }
97
98 /* Validate changes from /proc interface. */
99 static int ipv4_privileged_ports(struct ctl_table *table, int write,
100 void __user *buffer, size_t *lenp, loff_t *ppos)
101 {
102 struct net *net = container_of(table->data, struct net,
103 ipv4.sysctl_ip_prot_sock);
104 int ret;
105 int pports;
106 int range[2];
107 struct ctl_table tmp = {
108 .data = &pports,
109 .maxlen = sizeof(pports),
110 .mode = table->mode,
111 .extra1 = &ip_privileged_port_min,
112 .extra2 = &ip_privileged_port_max,
113 };
114
115 pports = net->ipv4.sysctl_ip_prot_sock;
116
117 ret = proc_dointvec_minmax(&tmp, write, buffer, lenp, ppos);
118
119 if (write && ret == 0) {
120 inet_get_local_port_range(net, &range[0], &range[1]);
121 /* Ensure that the local port range doesn't overlap with the
122 * privileged port range.
123 */
124 if (range[0] < pports)
125 ret = -EINVAL;
126 else
127 net->ipv4.sysctl_ip_prot_sock = pports;
128 }
129
130 return ret;
131 }
132
133 static void inet_get_ping_group_range_table(struct ctl_table *table, kgid_t *low, kgid_t *high)
134 {
135 kgid_t *data = table->data;
136 struct net *net =
137 container_of(table->data, struct net, ipv4.ping_group_range.range);
138 unsigned int seq;
139 do {
140 seq = read_seqbegin(&net->ipv4.ping_group_range.lock);
141
142 *low = data[0];
143 *high = data[1];
144 } while (read_seqretry(&net->ipv4.ping_group_range.lock, seq));
145 }
146
147 /* Update system visible IP port range */
148 static void set_ping_group_range(struct ctl_table *table, kgid_t low, kgid_t high)
149 {
150 kgid_t *data = table->data;
151 struct net *net =
152 container_of(table->data, struct net, ipv4.ping_group_range.range);
153 write_seqlock(&net->ipv4.ping_group_range.lock);
154 data[0] = low;
155 data[1] = high;
156 write_sequnlock(&net->ipv4.ping_group_range.lock);
157 }
158
159 /* Validate changes from /proc interface. */
160 static int ipv4_ping_group_range(struct ctl_table *table, int write,
161 void __user *buffer,
162 size_t *lenp, loff_t *ppos)
163 {
164 struct user_namespace *user_ns = current_user_ns();
165 int ret;
166 gid_t urange[2];
167 kgid_t low, high;
168 struct ctl_table tmp = {
169 .data = &urange,
170 .maxlen = sizeof(urange),
171 .mode = table->mode,
172 .extra1 = &ip_ping_group_range_min,
173 .extra2 = &ip_ping_group_range_max,
174 };
175
176 inet_get_ping_group_range_table(table, &low, &high);
177 urange[0] = from_kgid_munged(user_ns, low);
178 urange[1] = from_kgid_munged(user_ns, high);
179 ret = proc_dointvec_minmax(&tmp, write, buffer, lenp, ppos);
180
181 if (write && ret == 0) {
182 low = make_kgid(user_ns, urange[0]);
183 high = make_kgid(user_ns, urange[1]);
184 if (!gid_valid(low) || !gid_valid(high) ||
185 (urange[1] < urange[0]) || gid_lt(high, low)) {
186 low = make_kgid(&init_user_ns, 1);
187 high = make_kgid(&init_user_ns, 0);
188 }
189 set_ping_group_range(table, low, high);
190 }
191
192 return ret;
193 }
194
195 static int proc_tcp_congestion_control(struct ctl_table *ctl, int write,
196 void __user *buffer, size_t *lenp, loff_t *ppos)
197 {
198 char val[TCP_CA_NAME_MAX];
199 struct ctl_table tbl = {
200 .data = val,
201 .maxlen = TCP_CA_NAME_MAX,
202 };
203 int ret;
204
205 tcp_get_default_congestion_control(val);
206
207 ret = proc_dostring(&tbl, write, buffer, lenp, ppos);
208 if (write && ret == 0)
209 ret = tcp_set_default_congestion_control(val);
210 return ret;
211 }
212
213 static int proc_tcp_available_congestion_control(struct ctl_table *ctl,
214 int write,
215 void __user *buffer, size_t *lenp,
216 loff_t *ppos)
217 {
218 struct ctl_table tbl = { .maxlen = TCP_CA_BUF_MAX, };
219 int ret;
220
221 tbl.data = kmalloc(tbl.maxlen, GFP_USER);
222 if (!tbl.data)
223 return -ENOMEM;
224 tcp_get_available_congestion_control(tbl.data, TCP_CA_BUF_MAX);
225 ret = proc_dostring(&tbl, write, buffer, lenp, ppos);
226 kfree(tbl.data);
227 return ret;
228 }
229
230 static int proc_allowed_congestion_control(struct ctl_table *ctl,
231 int write,
232 void __user *buffer, size_t *lenp,
233 loff_t *ppos)
234 {
235 struct ctl_table tbl = { .maxlen = TCP_CA_BUF_MAX };
236 int ret;
237
238 tbl.data = kmalloc(tbl.maxlen, GFP_USER);
239 if (!tbl.data)
240 return -ENOMEM;
241
242 tcp_get_allowed_congestion_control(tbl.data, tbl.maxlen);
243 ret = proc_dostring(&tbl, write, buffer, lenp, ppos);
244 if (write && ret == 0)
245 ret = tcp_set_allowed_congestion_control(tbl.data);
246 kfree(tbl.data);
247 return ret;
248 }
249
250 static int proc_tcp_fastopen_key(struct ctl_table *ctl, int write,
251 void __user *buffer, size_t *lenp,
252 loff_t *ppos)
253 {
254 struct ctl_table tbl = { .maxlen = (TCP_FASTOPEN_KEY_LENGTH * 2 + 10) };
255 struct tcp_fastopen_context *ctxt;
256 int ret;
257 u32 user_key[4]; /* 16 bytes, matching TCP_FASTOPEN_KEY_LENGTH */
258
259 tbl.data = kmalloc(tbl.maxlen, GFP_KERNEL);
260 if (!tbl.data)
261 return -ENOMEM;
262
263 rcu_read_lock();
264 ctxt = rcu_dereference(tcp_fastopen_ctx);
265 if (ctxt)
266 memcpy(user_key, ctxt->key, TCP_FASTOPEN_KEY_LENGTH);
267 else
268 memset(user_key, 0, sizeof(user_key));
269 rcu_read_unlock();
270
271 snprintf(tbl.data, tbl.maxlen, "%08x-%08x-%08x-%08x",
272 user_key[0], user_key[1], user_key[2], user_key[3]);
273 ret = proc_dostring(&tbl, write, buffer, lenp, ppos);
274
275 if (write && ret == 0) {
276 if (sscanf(tbl.data, "%x-%x-%x-%x", user_key, user_key + 1,
277 user_key + 2, user_key + 3) != 4) {
278 ret = -EINVAL;
279 goto bad_key;
280 }
281 /* Generate a dummy secret but don't publish it. This
282 * is needed so we don't regenerate a new key on the
283 * first invocation of tcp_fastopen_cookie_gen
284 */
285 tcp_fastopen_init_key_once(false);
286 tcp_fastopen_reset_cipher(user_key, TCP_FASTOPEN_KEY_LENGTH);
287 }
288
289 bad_key:
290 pr_debug("proc FO key set 0x%x-%x-%x-%x <- 0x%s: %u\n",
291 user_key[0], user_key[1], user_key[2], user_key[3],
292 (char *)tbl.data, ret);
293 kfree(tbl.data);
294 return ret;
295 }
296
297 static struct ctl_table ipv4_table[] = {
298 {
299 .procname = "tcp_timestamps",
300 .data = &sysctl_tcp_timestamps,
301 .maxlen = sizeof(int),
302 .mode = 0644,
303 .proc_handler = proc_dointvec
304 },
305 {
306 .procname = "tcp_window_scaling",
307 .data = &sysctl_tcp_window_scaling,
308 .maxlen = sizeof(int),
309 .mode = 0644,
310 .proc_handler = proc_dointvec
311 },
312 {
313 .procname = "tcp_sack",
314 .data = &sysctl_tcp_sack,
315 .maxlen = sizeof(int),
316 .mode = 0644,
317 .proc_handler = proc_dointvec
318 },
319 {
320 .procname = "tcp_retrans_collapse",
321 .data = &sysctl_tcp_retrans_collapse,
322 .maxlen = sizeof(int),
323 .mode = 0644,
324 .proc_handler = proc_dointvec
325 },
326 {
327 .procname = "tcp_max_orphans",
328 .data = &sysctl_tcp_max_orphans,
329 .maxlen = sizeof(int),
330 .mode = 0644,
331 .proc_handler = proc_dointvec
332 },
333 {
334 .procname = "tcp_fastopen",
335 .data = &sysctl_tcp_fastopen,
336 .maxlen = sizeof(int),
337 .mode = 0644,
338 .proc_handler = proc_dointvec,
339 },
340 {
341 .procname = "tcp_fastopen_key",
342 .mode = 0600,
343 .maxlen = ((TCP_FASTOPEN_KEY_LENGTH * 2) + 10),
344 .proc_handler = proc_tcp_fastopen_key,
345 },
346 {
347 .procname = "tcp_abort_on_overflow",
348 .data = &sysctl_tcp_abort_on_overflow,
349 .maxlen = sizeof(int),
350 .mode = 0644,
351 .proc_handler = proc_dointvec
352 },
353 {
354 .procname = "tcp_stdurg",
355 .data = &sysctl_tcp_stdurg,
356 .maxlen = sizeof(int),
357 .mode = 0644,
358 .proc_handler = proc_dointvec
359 },
360 {
361 .procname = "tcp_rfc1337",
362 .data = &sysctl_tcp_rfc1337,
363 .maxlen = sizeof(int),
364 .mode = 0644,
365 .proc_handler = proc_dointvec
366 },
367 {
368 .procname = "inet_peer_threshold",
369 .data = &inet_peer_threshold,
370 .maxlen = sizeof(int),
371 .mode = 0644,
372 .proc_handler = proc_dointvec
373 },
374 {
375 .procname = "inet_peer_minttl",
376 .data = &inet_peer_minttl,
377 .maxlen = sizeof(int),
378 .mode = 0644,
379 .proc_handler = proc_dointvec_jiffies,
380 },
381 {
382 .procname = "inet_peer_maxttl",
383 .data = &inet_peer_maxttl,
384 .maxlen = sizeof(int),
385 .mode = 0644,
386 .proc_handler = proc_dointvec_jiffies,
387 },
388 {
389 .procname = "tcp_fack",
390 .data = &sysctl_tcp_fack,
391 .maxlen = sizeof(int),
392 .mode = 0644,
393 .proc_handler = proc_dointvec
394 },
395 {
396 .procname = "tcp_recovery",
397 .data = &sysctl_tcp_recovery,
398 .maxlen = sizeof(int),
399 .mode = 0644,
400 .proc_handler = proc_dointvec,
401 },
402 {
403 .procname = "tcp_max_reordering",
404 .data = &sysctl_tcp_max_reordering,
405 .maxlen = sizeof(int),
406 .mode = 0644,
407 .proc_handler = proc_dointvec
408 },
409 {
410 .procname = "tcp_dsack",
411 .data = &sysctl_tcp_dsack,
412 .maxlen = sizeof(int),
413 .mode = 0644,
414 .proc_handler = proc_dointvec
415 },
416 {
417 .procname = "tcp_mem",
418 .maxlen = sizeof(sysctl_tcp_mem),
419 .data = &sysctl_tcp_mem,
420 .mode = 0644,
421 .proc_handler = proc_doulongvec_minmax,
422 },
423 {
424 .procname = "tcp_wmem",
425 .data = &sysctl_tcp_wmem,
426 .maxlen = sizeof(sysctl_tcp_wmem),
427 .mode = 0644,
428 .proc_handler = proc_dointvec_minmax,
429 .extra1 = &one,
430 },
431 {
432 .procname = "tcp_rmem",
433 .data = &sysctl_tcp_rmem,
434 .maxlen = sizeof(sysctl_tcp_rmem),
435 .mode = 0644,
436 .proc_handler = proc_dointvec_minmax,
437 .extra1 = &one,
438 },
439 {
440 .procname = "tcp_app_win",
441 .data = &sysctl_tcp_app_win,
442 .maxlen = sizeof(int),
443 .mode = 0644,
444 .proc_handler = proc_dointvec
445 },
446 {
447 .procname = "tcp_adv_win_scale",
448 .data = &sysctl_tcp_adv_win_scale,
449 .maxlen = sizeof(int),
450 .mode = 0644,
451 .proc_handler = proc_dointvec_minmax,
452 .extra1 = &tcp_adv_win_scale_min,
453 .extra2 = &tcp_adv_win_scale_max,
454 },
455 {
456 .procname = "tcp_frto",
457 .data = &sysctl_tcp_frto,
458 .maxlen = sizeof(int),
459 .mode = 0644,
460 .proc_handler = proc_dointvec
461 },
462 {
463 .procname = "tcp_min_rtt_wlen",
464 .data = &sysctl_tcp_min_rtt_wlen,
465 .maxlen = sizeof(int),
466 .mode = 0644,
467 .proc_handler = proc_dointvec
468 },
469 {
470 .procname = "tcp_low_latency",
471 .data = &sysctl_tcp_low_latency,
472 .maxlen = sizeof(int),
473 .mode = 0644,
474 .proc_handler = proc_dointvec
475 },
476 {
477 .procname = "tcp_no_metrics_save",
478 .data = &sysctl_tcp_nometrics_save,
479 .maxlen = sizeof(int),
480 .mode = 0644,
481 .proc_handler = proc_dointvec,
482 },
483 {
484 .procname = "tcp_moderate_rcvbuf",
485 .data = &sysctl_tcp_moderate_rcvbuf,
486 .maxlen = sizeof(int),
487 .mode = 0644,
488 .proc_handler = proc_dointvec,
489 },
490 {
491 .procname = "tcp_tso_win_divisor",
492 .data = &sysctl_tcp_tso_win_divisor,
493 .maxlen = sizeof(int),
494 .mode = 0644,
495 .proc_handler = proc_dointvec,
496 },
497 {
498 .procname = "tcp_congestion_control",
499 .mode = 0644,
500 .maxlen = TCP_CA_NAME_MAX,
501 .proc_handler = proc_tcp_congestion_control,
502 },
503 {
504 .procname = "tcp_workaround_signed_windows",
505 .data = &sysctl_tcp_workaround_signed_windows,
506 .maxlen = sizeof(int),
507 .mode = 0644,
508 .proc_handler = proc_dointvec
509 },
510 {
511 .procname = "tcp_limit_output_bytes",
512 .data = &sysctl_tcp_limit_output_bytes,
513 .maxlen = sizeof(int),
514 .mode = 0644,
515 .proc_handler = proc_dointvec
516 },
517 {
518 .procname = "tcp_challenge_ack_limit",
519 .data = &sysctl_tcp_challenge_ack_limit,
520 .maxlen = sizeof(int),
521 .mode = 0644,
522 .proc_handler = proc_dointvec
523 },
524 {
525 .procname = "tcp_slow_start_after_idle",
526 .data = &sysctl_tcp_slow_start_after_idle,
527 .maxlen = sizeof(int),
528 .mode = 0644,
529 .proc_handler = proc_dointvec
530 },
531 #ifdef CONFIG_NETLABEL
532 {
533 .procname = "cipso_cache_enable",
534 .data = &cipso_v4_cache_enabled,
535 .maxlen = sizeof(int),
536 .mode = 0644,
537 .proc_handler = proc_dointvec,
538 },
539 {
540 .procname = "cipso_cache_bucket_size",
541 .data = &cipso_v4_cache_bucketsize,
542 .maxlen = sizeof(int),
543 .mode = 0644,
544 .proc_handler = proc_dointvec,
545 },
546 {
547 .procname = "cipso_rbm_optfmt",
548 .data = &cipso_v4_rbm_optfmt,
549 .maxlen = sizeof(int),
550 .mode = 0644,
551 .proc_handler = proc_dointvec,
552 },
553 {
554 .procname = "cipso_rbm_strictvalid",
555 .data = &cipso_v4_rbm_strictvalid,
556 .maxlen = sizeof(int),
557 .mode = 0644,
558 .proc_handler = proc_dointvec,
559 },
560 #endif /* CONFIG_NETLABEL */
561 {
562 .procname = "tcp_available_congestion_control",
563 .maxlen = TCP_CA_BUF_MAX,
564 .mode = 0444,
565 .proc_handler = proc_tcp_available_congestion_control,
566 },
567 {
568 .procname = "tcp_allowed_congestion_control",
569 .maxlen = TCP_CA_BUF_MAX,
570 .mode = 0644,
571 .proc_handler = proc_allowed_congestion_control,
572 },
573 {
574 .procname = "tcp_thin_linear_timeouts",
575 .data = &sysctl_tcp_thin_linear_timeouts,
576 .maxlen = sizeof(int),
577 .mode = 0644,
578 .proc_handler = proc_dointvec
579 },
580 {
581 .procname = "tcp_early_retrans",
582 .data = &sysctl_tcp_early_retrans,
583 .maxlen = sizeof(int),
584 .mode = 0644,
585 .proc_handler = proc_dointvec_minmax,
586 .extra1 = &zero,
587 .extra2 = &four,
588 },
589 {
590 .procname = "tcp_min_tso_segs",
591 .data = &sysctl_tcp_min_tso_segs,
592 .maxlen = sizeof(int),
593 .mode = 0644,
594 .proc_handler = proc_dointvec_minmax,
595 .extra1 = &one,
596 .extra2 = &gso_max_segs,
597 },
598 {
599 .procname = "tcp_pacing_ss_ratio",
600 .data = &sysctl_tcp_pacing_ss_ratio,
601 .maxlen = sizeof(int),
602 .mode = 0644,
603 .proc_handler = proc_dointvec_minmax,
604 .extra1 = &zero,
605 .extra2 = &thousand,
606 },
607 {
608 .procname = "tcp_pacing_ca_ratio",
609 .data = &sysctl_tcp_pacing_ca_ratio,
610 .maxlen = sizeof(int),
611 .mode = 0644,
612 .proc_handler = proc_dointvec_minmax,
613 .extra1 = &zero,
614 .extra2 = &thousand,
615 },
616 {
617 .procname = "tcp_autocorking",
618 .data = &sysctl_tcp_autocorking,
619 .maxlen = sizeof(int),
620 .mode = 0644,
621 .proc_handler = proc_dointvec_minmax,
622 .extra1 = &zero,
623 .extra2 = &one,
624 },
625 {
626 .procname = "tcp_invalid_ratelimit",
627 .data = &sysctl_tcp_invalid_ratelimit,
628 .maxlen = sizeof(int),
629 .mode = 0644,
630 .proc_handler = proc_dointvec_ms_jiffies,
631 },
632 {
633 .procname = "icmp_msgs_per_sec",
634 .data = &sysctl_icmp_msgs_per_sec,
635 .maxlen = sizeof(int),
636 .mode = 0644,
637 .proc_handler = proc_dointvec_minmax,
638 .extra1 = &zero,
639 },
640 {
641 .procname = "icmp_msgs_burst",
642 .data = &sysctl_icmp_msgs_burst,
643 .maxlen = sizeof(int),
644 .mode = 0644,
645 .proc_handler = proc_dointvec_minmax,
646 .extra1 = &zero,
647 },
648 {
649 .procname = "udp_mem",
650 .data = &sysctl_udp_mem,
651 .maxlen = sizeof(sysctl_udp_mem),
652 .mode = 0644,
653 .proc_handler = proc_doulongvec_minmax,
654 },
655 {
656 .procname = "udp_rmem_min",
657 .data = &sysctl_udp_rmem_min,
658 .maxlen = sizeof(sysctl_udp_rmem_min),
659 .mode = 0644,
660 .proc_handler = proc_dointvec_minmax,
661 .extra1 = &one
662 },
663 {
664 .procname = "udp_wmem_min",
665 .data = &sysctl_udp_wmem_min,
666 .maxlen = sizeof(sysctl_udp_wmem_min),
667 .mode = 0644,
668 .proc_handler = proc_dointvec_minmax,
669 .extra1 = &one
670 },
671 { }
672 };
673
674 static struct ctl_table ipv4_net_table[] = {
675 {
676 .procname = "icmp_echo_ignore_all",
677 .data = &init_net.ipv4.sysctl_icmp_echo_ignore_all,
678 .maxlen = sizeof(int),
679 .mode = 0644,
680 .proc_handler = proc_dointvec
681 },
682 {
683 .procname = "icmp_echo_ignore_broadcasts",
684 .data = &init_net.ipv4.sysctl_icmp_echo_ignore_broadcasts,
685 .maxlen = sizeof(int),
686 .mode = 0644,
687 .proc_handler = proc_dointvec
688 },
689 {
690 .procname = "icmp_ignore_bogus_error_responses",
691 .data = &init_net.ipv4.sysctl_icmp_ignore_bogus_error_responses,
692 .maxlen = sizeof(int),
693 .mode = 0644,
694 .proc_handler = proc_dointvec
695 },
696 {
697 .procname = "icmp_errors_use_inbound_ifaddr",
698 .data = &init_net.ipv4.sysctl_icmp_errors_use_inbound_ifaddr,
699 .maxlen = sizeof(int),
700 .mode = 0644,
701 .proc_handler = proc_dointvec
702 },
703 {
704 .procname = "icmp_ratelimit",
705 .data = &init_net.ipv4.sysctl_icmp_ratelimit,
706 .maxlen = sizeof(int),
707 .mode = 0644,
708 .proc_handler = proc_dointvec_ms_jiffies,
709 },
710 {
711 .procname = "icmp_ratemask",
712 .data = &init_net.ipv4.sysctl_icmp_ratemask,
713 .maxlen = sizeof(int),
714 .mode = 0644,
715 .proc_handler = proc_dointvec
716 },
717 {
718 .procname = "ping_group_range",
719 .data = &init_net.ipv4.ping_group_range.range,
720 .maxlen = sizeof(gid_t)*2,
721 .mode = 0644,
722 .proc_handler = ipv4_ping_group_range,
723 },
724 {
725 .procname = "tcp_ecn",
726 .data = &init_net.ipv4.sysctl_tcp_ecn,
727 .maxlen = sizeof(int),
728 .mode = 0644,
729 .proc_handler = proc_dointvec
730 },
731 {
732 .procname = "tcp_ecn_fallback",
733 .data = &init_net.ipv4.sysctl_tcp_ecn_fallback,
734 .maxlen = sizeof(int),
735 .mode = 0644,
736 .proc_handler = proc_dointvec
737 },
738 {
739 .procname = "ip_dynaddr",
740 .data = &init_net.ipv4.sysctl_ip_dynaddr,
741 .maxlen = sizeof(int),
742 .mode = 0644,
743 .proc_handler = proc_dointvec
744 },
745 {
746 .procname = "ip_early_demux",
747 .data = &init_net.ipv4.sysctl_ip_early_demux,
748 .maxlen = sizeof(int),
749 .mode = 0644,
750 .proc_handler = proc_dointvec
751 },
752 {
753 .procname = "ip_default_ttl",
754 .data = &init_net.ipv4.sysctl_ip_default_ttl,
755 .maxlen = sizeof(int),
756 .mode = 0644,
757 .proc_handler = proc_dointvec_minmax,
758 .extra1 = &ip_ttl_min,
759 .extra2 = &ip_ttl_max,
760 },
761 {
762 .procname = "ip_local_port_range",
763 .maxlen = sizeof(init_net.ipv4.ip_local_ports.range),
764 .data = &init_net.ipv4.ip_local_ports.range,
765 .mode = 0644,
766 .proc_handler = ipv4_local_port_range,
767 },
768 {
769 .procname = "ip_local_reserved_ports",
770 .data = &init_net.ipv4.sysctl_local_reserved_ports,
771 .maxlen = 65536,
772 .mode = 0644,
773 .proc_handler = proc_do_large_bitmap,
774 },
775 {
776 .procname = "ip_no_pmtu_disc",
777 .data = &init_net.ipv4.sysctl_ip_no_pmtu_disc,
778 .maxlen = sizeof(int),
779 .mode = 0644,
780 .proc_handler = proc_dointvec
781 },
782 {
783 .procname = "ip_forward_use_pmtu",
784 .data = &init_net.ipv4.sysctl_ip_fwd_use_pmtu,
785 .maxlen = sizeof(int),
786 .mode = 0644,
787 .proc_handler = proc_dointvec,
788 },
789 {
790 .procname = "ip_nonlocal_bind",
791 .data = &init_net.ipv4.sysctl_ip_nonlocal_bind,
792 .maxlen = sizeof(int),
793 .mode = 0644,
794 .proc_handler = proc_dointvec
795 },
796 {
797 .procname = "fwmark_reflect",
798 .data = &init_net.ipv4.sysctl_fwmark_reflect,
799 .maxlen = sizeof(int),
800 .mode = 0644,
801 .proc_handler = proc_dointvec,
802 },
803 {
804 .procname = "tcp_fwmark_accept",
805 .data = &init_net.ipv4.sysctl_tcp_fwmark_accept,
806 .maxlen = sizeof(int),
807 .mode = 0644,
808 .proc_handler = proc_dointvec,
809 },
810 #ifdef CONFIG_NET_L3_MASTER_DEV
811 {
812 .procname = "tcp_l3mdev_accept",
813 .data = &init_net.ipv4.sysctl_tcp_l3mdev_accept,
814 .maxlen = sizeof(int),
815 .mode = 0644,
816 .proc_handler = proc_dointvec_minmax,
817 .extra1 = &zero,
818 .extra2 = &one,
819 },
820 #endif
821 {
822 .procname = "tcp_mtu_probing",
823 .data = &init_net.ipv4.sysctl_tcp_mtu_probing,
824 .maxlen = sizeof(int),
825 .mode = 0644,
826 .proc_handler = proc_dointvec,
827 },
828 {
829 .procname = "tcp_base_mss",
830 .data = &init_net.ipv4.sysctl_tcp_base_mss,
831 .maxlen = sizeof(int),
832 .mode = 0644,
833 .proc_handler = proc_dointvec,
834 },
835 {
836 .procname = "tcp_probe_threshold",
837 .data = &init_net.ipv4.sysctl_tcp_probe_threshold,
838 .maxlen = sizeof(int),
839 .mode = 0644,
840 .proc_handler = proc_dointvec,
841 },
842 {
843 .procname = "tcp_probe_interval",
844 .data = &init_net.ipv4.sysctl_tcp_probe_interval,
845 .maxlen = sizeof(int),
846 .mode = 0644,
847 .proc_handler = proc_dointvec,
848 },
849 {
850 .procname = "igmp_link_local_mcast_reports",
851 .data = &init_net.ipv4.sysctl_igmp_llm_reports,
852 .maxlen = sizeof(int),
853 .mode = 0644,
854 .proc_handler = proc_dointvec
855 },
856 {
857 .procname = "igmp_max_memberships",
858 .data = &init_net.ipv4.sysctl_igmp_max_memberships,
859 .maxlen = sizeof(int),
860 .mode = 0644,
861 .proc_handler = proc_dointvec
862 },
863 {
864 .procname = "igmp_max_msf",
865 .data = &init_net.ipv4.sysctl_igmp_max_msf,
866 .maxlen = sizeof(int),
867 .mode = 0644,
868 .proc_handler = proc_dointvec
869 },
870 #ifdef CONFIG_IP_MULTICAST
871 {
872 .procname = "igmp_qrv",
873 .data = &init_net.ipv4.sysctl_igmp_qrv,
874 .maxlen = sizeof(int),
875 .mode = 0644,
876 .proc_handler = proc_dointvec_minmax,
877 .extra1 = &one
878 },
879 #endif
880 {
881 .procname = "tcp_keepalive_time",
882 .data = &init_net.ipv4.sysctl_tcp_keepalive_time,
883 .maxlen = sizeof(int),
884 .mode = 0644,
885 .proc_handler = proc_dointvec_jiffies,
886 },
887 {
888 .procname = "tcp_keepalive_probes",
889 .data = &init_net.ipv4.sysctl_tcp_keepalive_probes,
890 .maxlen = sizeof(int),
891 .mode = 0644,
892 .proc_handler = proc_dointvec
893 },
894 {
895 .procname = "tcp_keepalive_intvl",
896 .data = &init_net.ipv4.sysctl_tcp_keepalive_intvl,
897 .maxlen = sizeof(int),
898 .mode = 0644,
899 .proc_handler = proc_dointvec_jiffies,
900 },
901 {
902 .procname = "tcp_syn_retries",
903 .data = &init_net.ipv4.sysctl_tcp_syn_retries,
904 .maxlen = sizeof(int),
905 .mode = 0644,
906 .proc_handler = proc_dointvec_minmax,
907 .extra1 = &tcp_syn_retries_min,
908 .extra2 = &tcp_syn_retries_max
909 },
910 {
911 .procname = "tcp_synack_retries",
912 .data = &init_net.ipv4.sysctl_tcp_synack_retries,
913 .maxlen = sizeof(int),
914 .mode = 0644,
915 .proc_handler = proc_dointvec
916 },
917 #ifdef CONFIG_SYN_COOKIES
918 {
919 .procname = "tcp_syncookies",
920 .data = &init_net.ipv4.sysctl_tcp_syncookies,
921 .maxlen = sizeof(int),
922 .mode = 0644,
923 .proc_handler = proc_dointvec
924 },
925 #endif
926 {
927 .procname = "tcp_reordering",
928 .data = &init_net.ipv4.sysctl_tcp_reordering,
929 .maxlen = sizeof(int),
930 .mode = 0644,
931 .proc_handler = proc_dointvec
932 },
933 {
934 .procname = "tcp_retries1",
935 .data = &init_net.ipv4.sysctl_tcp_retries1,
936 .maxlen = sizeof(int),
937 .mode = 0644,
938 .proc_handler = proc_dointvec_minmax,
939 .extra2 = &tcp_retr1_max
940 },
941 {
942 .procname = "tcp_retries2",
943 .data = &init_net.ipv4.sysctl_tcp_retries2,
944 .maxlen = sizeof(int),
945 .mode = 0644,
946 .proc_handler = proc_dointvec
947 },
948 {
949 .procname = "tcp_orphan_retries",
950 .data = &init_net.ipv4.sysctl_tcp_orphan_retries,
951 .maxlen = sizeof(int),
952 .mode = 0644,
953 .proc_handler = proc_dointvec
954 },
955 {
956 .procname = "tcp_fin_timeout",
957 .data = &init_net.ipv4.sysctl_tcp_fin_timeout,
958 .maxlen = sizeof(int),
959 .mode = 0644,
960 .proc_handler = proc_dointvec_jiffies,
961 },
962 {
963 .procname = "tcp_notsent_lowat",
964 .data = &init_net.ipv4.sysctl_tcp_notsent_lowat,
965 .maxlen = sizeof(unsigned int),
966 .mode = 0644,
967 .proc_handler = proc_douintvec,
968 },
969 {
970 .procname = "tcp_tw_reuse",
971 .data = &init_net.ipv4.sysctl_tcp_tw_reuse,
972 .maxlen = sizeof(int),
973 .mode = 0644,
974 .proc_handler = proc_dointvec
975 },
976 {
977 .procname = "tcp_max_tw_buckets",
978 .data = &init_net.ipv4.tcp_death_row.sysctl_max_tw_buckets,
979 .maxlen = sizeof(int),
980 .mode = 0644,
981 .proc_handler = proc_dointvec
982 },
983 {
984 .procname = "tcp_tw_recycle",
985 .data = &init_net.ipv4.tcp_death_row.sysctl_tw_recycle,
986 .maxlen = sizeof(int),
987 .mode = 0644,
988 .proc_handler = proc_dointvec
989 },
990 {
991 .procname = "tcp_max_syn_backlog",
992 .data = &init_net.ipv4.sysctl_max_syn_backlog,
993 .maxlen = sizeof(int),
994 .mode = 0644,
995 .proc_handler = proc_dointvec
996 },
997 #ifdef CONFIG_IP_ROUTE_MULTIPATH
998 {
999 .procname = "fib_multipath_use_neigh",
1000 .data = &init_net.ipv4.sysctl_fib_multipath_use_neigh,
1001 .maxlen = sizeof(int),
1002 .mode = 0644,
1003 .proc_handler = proc_dointvec_minmax,
1004 .extra1 = &zero,
1005 .extra2 = &one,
1006 },
1007 #endif
1008 {
1009 .procname = "ip_unprivileged_port_start",
1010 .maxlen = sizeof(int),
1011 .data = &init_net.ipv4.sysctl_ip_prot_sock,
1012 .mode = 0644,
1013 .proc_handler = ipv4_privileged_ports,
1014 },
1015 #ifdef CONFIG_NET_L3_MASTER_DEV
1016 {
1017 .procname = "udp_l3mdev_accept",
1018 .data = &init_net.ipv4.sysctl_udp_l3mdev_accept,
1019 .maxlen = sizeof(int),
1020 .mode = 0644,
1021 .proc_handler = proc_dointvec_minmax,
1022 .extra1 = &zero,
1023 .extra2 = &one,
1024 },
1025 #endif
1026 { }
1027 };
1028
1029 static __net_init int ipv4_sysctl_init_net(struct net *net)
1030 {
1031 struct ctl_table *table;
1032
1033 table = ipv4_net_table;
1034 if (!net_eq(net, &init_net)) {
1035 int i;
1036
1037 table = kmemdup(table, sizeof(ipv4_net_table), GFP_KERNEL);
1038 if (!table)
1039 goto err_alloc;
1040
1041 /* Update the variables to point into the current struct net */
1042 for (i = 0; i < ARRAY_SIZE(ipv4_net_table) - 1; i++)
1043 table[i].data += (void *)net - (void *)&init_net;
1044 }
1045
1046 net->ipv4.ipv4_hdr = register_net_sysctl(net, "net/ipv4", table);
1047 if (!net->ipv4.ipv4_hdr)
1048 goto err_reg;
1049
1050 net->ipv4.sysctl_local_reserved_ports = kzalloc(65536 / 8, GFP_KERNEL);
1051 if (!net->ipv4.sysctl_local_reserved_ports)
1052 goto err_ports;
1053
1054 return 0;
1055
1056 err_ports:
1057 unregister_net_sysctl_table(net->ipv4.ipv4_hdr);
1058 err_reg:
1059 if (!net_eq(net, &init_net))
1060 kfree(table);
1061 err_alloc:
1062 return -ENOMEM;
1063 }
1064
1065 static __net_exit void ipv4_sysctl_exit_net(struct net *net)
1066 {
1067 struct ctl_table *table;
1068
1069 kfree(net->ipv4.sysctl_local_reserved_ports);
1070 table = net->ipv4.ipv4_hdr->ctl_table_arg;
1071 unregister_net_sysctl_table(net->ipv4.ipv4_hdr);
1072 kfree(table);
1073 }
1074
1075 static __net_initdata struct pernet_operations ipv4_sysctl_ops = {
1076 .init = ipv4_sysctl_init_net,
1077 .exit = ipv4_sysctl_exit_net,
1078 };
1079
1080 static __init int sysctl_ipv4_init(void)
1081 {
1082 struct ctl_table_header *hdr;
1083
1084 hdr = register_net_sysctl(&init_net, "net/ipv4", ipv4_table);
1085 if (!hdr)
1086 return -ENOMEM;
1087
1088 if (register_pernet_subsys(&ipv4_sysctl_ops)) {
1089 unregister_net_sysctl_table(hdr);
1090 return -ENOMEM;
1091 }
1092
1093 return 0;
1094 }
1095
1096 __initcall(sysctl_ipv4_init);
Linux with added FPC-III support