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ipv4: Namespaceify tcp syncookies sysctl knob
[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 = "ip_default_ttl",
287 .data = &sysctl_ip_default_ttl,
288 .maxlen = sizeof(int),
289 .mode = 0644,
290 .proc_handler = proc_dointvec_minmax,
291 .extra1 = &ip_ttl_min,
292 .extra2 = &ip_ttl_max,
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 = "ip_early_demux",
310 .data = &sysctl_ip_early_demux,
311 .maxlen = sizeof(int),
312 .mode = 0644,
313 .proc_handler = proc_dointvec
314 },
315 {
316 .procname = "ip_dynaddr",
317 .data = &sysctl_ip_dynaddr,
318 .maxlen = sizeof(int),
319 .mode = 0644,
320 .proc_handler = proc_dointvec
321 },
322 {
323 .procname = "tcp_retries1",
324 .data = &sysctl_tcp_retries1,
325 .maxlen = sizeof(int),
326 .mode = 0644,
327 .proc_handler = proc_dointvec_minmax,
328 .extra2 = &tcp_retr1_max
329 },
330 {
331 .procname = "tcp_retries2",
332 .data = &sysctl_tcp_retries2,
333 .maxlen = sizeof(int),
334 .mode = 0644,
335 .proc_handler = proc_dointvec
336 },
337 {
338 .procname = "tcp_fin_timeout",
339 .data = &sysctl_tcp_fin_timeout,
340 .maxlen = sizeof(int),
341 .mode = 0644,
342 .proc_handler = proc_dointvec_jiffies,
343 },
344 {
345 .procname = "tcp_fastopen",
346 .data = &sysctl_tcp_fastopen,
347 .maxlen = sizeof(int),
348 .mode = 0644,
349 .proc_handler = proc_dointvec,
350 },
351 {
352 .procname = "tcp_fastopen_key",
353 .mode = 0600,
354 .maxlen = ((TCP_FASTOPEN_KEY_LENGTH * 2) + 10),
355 .proc_handler = proc_tcp_fastopen_key,
356 },
357 {
358 .procname = "tcp_tw_recycle",
359 .data = &tcp_death_row.sysctl_tw_recycle,
360 .maxlen = sizeof(int),
361 .mode = 0644,
362 .proc_handler = proc_dointvec
363 },
364 {
365 .procname = "tcp_abort_on_overflow",
366 .data = &sysctl_tcp_abort_on_overflow,
367 .maxlen = sizeof(int),
368 .mode = 0644,
369 .proc_handler = proc_dointvec
370 },
371 {
372 .procname = "tcp_stdurg",
373 .data = &sysctl_tcp_stdurg,
374 .maxlen = sizeof(int),
375 .mode = 0644,
376 .proc_handler = proc_dointvec
377 },
378 {
379 .procname = "tcp_rfc1337",
380 .data = &sysctl_tcp_rfc1337,
381 .maxlen = sizeof(int),
382 .mode = 0644,
383 .proc_handler = proc_dointvec
384 },
385 {
386 .procname = "tcp_max_syn_backlog",
387 .data = &sysctl_max_syn_backlog,
388 .maxlen = sizeof(int),
389 .mode = 0644,
390 .proc_handler = proc_dointvec
391 },
392 {
393 .procname = "igmp_max_memberships",
394 .data = &sysctl_igmp_max_memberships,
395 .maxlen = sizeof(int),
396 .mode = 0644,
397 .proc_handler = proc_dointvec
398 },
399 {
400 .procname = "igmp_max_msf",
401 .data = &sysctl_igmp_max_msf,
402 .maxlen = sizeof(int),
403 .mode = 0644,
404 .proc_handler = proc_dointvec
405 },
406 #ifdef CONFIG_IP_MULTICAST
407 {
408 .procname = "igmp_qrv",
409 .data = &sysctl_igmp_qrv,
410 .maxlen = sizeof(int),
411 .mode = 0644,
412 .proc_handler = proc_dointvec_minmax,
413 .extra1 = &one
414 },
415 #endif
416 {
417 .procname = "inet_peer_threshold",
418 .data = &inet_peer_threshold,
419 .maxlen = sizeof(int),
420 .mode = 0644,
421 .proc_handler = proc_dointvec
422 },
423 {
424 .procname = "inet_peer_minttl",
425 .data = &inet_peer_minttl,
426 .maxlen = sizeof(int),
427 .mode = 0644,
428 .proc_handler = proc_dointvec_jiffies,
429 },
430 {
431 .procname = "inet_peer_maxttl",
432 .data = &inet_peer_maxttl,
433 .maxlen = sizeof(int),
434 .mode = 0644,
435 .proc_handler = proc_dointvec_jiffies,
436 },
437 {
438 .procname = "tcp_orphan_retries",
439 .data = &sysctl_tcp_orphan_retries,
440 .maxlen = sizeof(int),
441 .mode = 0644,
442 .proc_handler = proc_dointvec
443 },
444 {
445 .procname = "tcp_fack",
446 .data = &sysctl_tcp_fack,
447 .maxlen = sizeof(int),
448 .mode = 0644,
449 .proc_handler = proc_dointvec
450 },
451 {
452 .procname = "tcp_recovery",
453 .data = &sysctl_tcp_recovery,
454 .maxlen = sizeof(int),
455 .mode = 0644,
456 .proc_handler = proc_dointvec,
457 },
458 {
459 .procname = "tcp_reordering",
460 .data = &sysctl_tcp_reordering,
461 .maxlen = sizeof(int),
462 .mode = 0644,
463 .proc_handler = proc_dointvec
464 },
465 {
466 .procname = "tcp_max_reordering",
467 .data = &sysctl_tcp_max_reordering,
468 .maxlen = sizeof(int),
469 .mode = 0644,
470 .proc_handler = proc_dointvec
471 },
472 {
473 .procname = "tcp_dsack",
474 .data = &sysctl_tcp_dsack,
475 .maxlen = sizeof(int),
476 .mode = 0644,
477 .proc_handler = proc_dointvec
478 },
479 {
480 .procname = "tcp_mem",
481 .maxlen = sizeof(sysctl_tcp_mem),
482 .data = &sysctl_tcp_mem,
483 .mode = 0644,
484 .proc_handler = proc_doulongvec_minmax,
485 },
486 {
487 .procname = "tcp_wmem",
488 .data = &sysctl_tcp_wmem,
489 .maxlen = sizeof(sysctl_tcp_wmem),
490 .mode = 0644,
491 .proc_handler = proc_dointvec_minmax,
492 .extra1 = &one,
493 },
494 {
495 .procname = "tcp_notsent_lowat",
496 .data = &sysctl_tcp_notsent_lowat,
497 .maxlen = sizeof(sysctl_tcp_notsent_lowat),
498 .mode = 0644,
499 .proc_handler = proc_dointvec,
500 },
501 {
502 .procname = "tcp_rmem",
503 .data = &sysctl_tcp_rmem,
504 .maxlen = sizeof(sysctl_tcp_rmem),
505 .mode = 0644,
506 .proc_handler = proc_dointvec_minmax,
507 .extra1 = &one,
508 },
509 {
510 .procname = "tcp_app_win",
511 .data = &sysctl_tcp_app_win,
512 .maxlen = sizeof(int),
513 .mode = 0644,
514 .proc_handler = proc_dointvec
515 },
516 {
517 .procname = "tcp_adv_win_scale",
518 .data = &sysctl_tcp_adv_win_scale,
519 .maxlen = sizeof(int),
520 .mode = 0644,
521 .proc_handler = proc_dointvec_minmax,
522 .extra1 = &tcp_adv_win_scale_min,
523 .extra2 = &tcp_adv_win_scale_max,
524 },
525 {
526 .procname = "tcp_tw_reuse",
527 .data = &sysctl_tcp_tw_reuse,
528 .maxlen = sizeof(int),
529 .mode = 0644,
530 .proc_handler = proc_dointvec
531 },
532 {
533 .procname = "tcp_frto",
534 .data = &sysctl_tcp_frto,
535 .maxlen = sizeof(int),
536 .mode = 0644,
537 .proc_handler = proc_dointvec
538 },
539 {
540 .procname = "tcp_min_rtt_wlen",
541 .data = &sysctl_tcp_min_rtt_wlen,
542 .maxlen = sizeof(int),
543 .mode = 0644,
544 .proc_handler = proc_dointvec
545 },
546 {
547 .procname = "tcp_low_latency",
548 .data = &sysctl_tcp_low_latency,
549 .maxlen = sizeof(int),
550 .mode = 0644,
551 .proc_handler = proc_dointvec
552 },
553 {
554 .procname = "tcp_no_metrics_save",
555 .data = &sysctl_tcp_nometrics_save,
556 .maxlen = sizeof(int),
557 .mode = 0644,
558 .proc_handler = proc_dointvec,
559 },
560 {
561 .procname = "tcp_moderate_rcvbuf",
562 .data = &sysctl_tcp_moderate_rcvbuf,
563 .maxlen = sizeof(int),
564 .mode = 0644,
565 .proc_handler = proc_dointvec,
566 },
567 {
568 .procname = "tcp_tso_win_divisor",
569 .data = &sysctl_tcp_tso_win_divisor,
570 .maxlen = sizeof(int),
571 .mode = 0644,
572 .proc_handler = proc_dointvec,
573 },
574 {
575 .procname = "tcp_congestion_control",
576 .mode = 0644,
577 .maxlen = TCP_CA_NAME_MAX,
578 .proc_handler = proc_tcp_congestion_control,
579 },
580 {
581 .procname = "tcp_workaround_signed_windows",
582 .data = &sysctl_tcp_workaround_signed_windows,
583 .maxlen = sizeof(int),
584 .mode = 0644,
585 .proc_handler = proc_dointvec
586 },
587 {
588 .procname = "tcp_limit_output_bytes",
589 .data = &sysctl_tcp_limit_output_bytes,
590 .maxlen = sizeof(int),
591 .mode = 0644,
592 .proc_handler = proc_dointvec
593 },
594 {
595 .procname = "tcp_challenge_ack_limit",
596 .data = &sysctl_tcp_challenge_ack_limit,
597 .maxlen = sizeof(int),
598 .mode = 0644,
599 .proc_handler = proc_dointvec
600 },
601 {
602 .procname = "tcp_slow_start_after_idle",
603 .data = &sysctl_tcp_slow_start_after_idle,
604 .maxlen = sizeof(int),
605 .mode = 0644,
606 .proc_handler = proc_dointvec
607 },
608 #ifdef CONFIG_NETLABEL
609 {
610 .procname = "cipso_cache_enable",
611 .data = &cipso_v4_cache_enabled,
612 .maxlen = sizeof(int),
613 .mode = 0644,
614 .proc_handler = proc_dointvec,
615 },
616 {
617 .procname = "cipso_cache_bucket_size",
618 .data = &cipso_v4_cache_bucketsize,
619 .maxlen = sizeof(int),
620 .mode = 0644,
621 .proc_handler = proc_dointvec,
622 },
623 {
624 .procname = "cipso_rbm_optfmt",
625 .data = &cipso_v4_rbm_optfmt,
626 .maxlen = sizeof(int),
627 .mode = 0644,
628 .proc_handler = proc_dointvec,
629 },
630 {
631 .procname = "cipso_rbm_strictvalid",
632 .data = &cipso_v4_rbm_strictvalid,
633 .maxlen = sizeof(int),
634 .mode = 0644,
635 .proc_handler = proc_dointvec,
636 },
637 #endif /* CONFIG_NETLABEL */
638 {
639 .procname = "tcp_available_congestion_control",
640 .maxlen = TCP_CA_BUF_MAX,
641 .mode = 0444,
642 .proc_handler = proc_tcp_available_congestion_control,
643 },
644 {
645 .procname = "tcp_allowed_congestion_control",
646 .maxlen = TCP_CA_BUF_MAX,
647 .mode = 0644,
648 .proc_handler = proc_allowed_congestion_control,
649 },
650 {
651 .procname = "tcp_thin_linear_timeouts",
652 .data = &sysctl_tcp_thin_linear_timeouts,
653 .maxlen = sizeof(int),
654 .mode = 0644,
655 .proc_handler = proc_dointvec
656 },
657 {
658 .procname = "tcp_thin_dupack",
659 .data = &sysctl_tcp_thin_dupack,
660 .maxlen = sizeof(int),
661 .mode = 0644,
662 .proc_handler = proc_dointvec
663 },
664 {
665 .procname = "tcp_early_retrans",
666 .data = &sysctl_tcp_early_retrans,
667 .maxlen = sizeof(int),
668 .mode = 0644,
669 .proc_handler = proc_dointvec_minmax,
670 .extra1 = &zero,
671 .extra2 = &four,
672 },
673 {
674 .procname = "tcp_min_tso_segs",
675 .data = &sysctl_tcp_min_tso_segs,
676 .maxlen = sizeof(int),
677 .mode = 0644,
678 .proc_handler = proc_dointvec_minmax,
679 .extra1 = &one,
680 .extra2 = &gso_max_segs,
681 },
682 {
683 .procname = "tcp_pacing_ss_ratio",
684 .data = &sysctl_tcp_pacing_ss_ratio,
685 .maxlen = sizeof(int),
686 .mode = 0644,
687 .proc_handler = proc_dointvec_minmax,
688 .extra1 = &zero,
689 .extra2 = &thousand,
690 },
691 {
692 .procname = "tcp_pacing_ca_ratio",
693 .data = &sysctl_tcp_pacing_ca_ratio,
694 .maxlen = sizeof(int),
695 .mode = 0644,
696 .proc_handler = proc_dointvec_minmax,
697 .extra1 = &zero,
698 .extra2 = &thousand,
699 },
700 {
701 .procname = "tcp_autocorking",
702 .data = &sysctl_tcp_autocorking,
703 .maxlen = sizeof(int),
704 .mode = 0644,
705 .proc_handler = proc_dointvec_minmax,
706 .extra1 = &zero,
707 .extra2 = &one,
708 },
709 {
710 .procname = "tcp_invalid_ratelimit",
711 .data = &sysctl_tcp_invalid_ratelimit,
712 .maxlen = sizeof(int),
713 .mode = 0644,
714 .proc_handler = proc_dointvec_ms_jiffies,
715 },
716 {
717 .procname = "icmp_msgs_per_sec",
718 .data = &sysctl_icmp_msgs_per_sec,
719 .maxlen = sizeof(int),
720 .mode = 0644,
721 .proc_handler = proc_dointvec_minmax,
722 .extra1 = &zero,
723 },
724 {
725 .procname = "icmp_msgs_burst",
726 .data = &sysctl_icmp_msgs_burst,
727 .maxlen = sizeof(int),
728 .mode = 0644,
729 .proc_handler = proc_dointvec_minmax,
730 .extra1 = &zero,
731 },
732 {
733 .procname = "udp_mem",
734 .data = &sysctl_udp_mem,
735 .maxlen = sizeof(sysctl_udp_mem),
736 .mode = 0644,
737 .proc_handler = proc_doulongvec_minmax,
738 },
739 {
740 .procname = "udp_rmem_min",
741 .data = &sysctl_udp_rmem_min,
742 .maxlen = sizeof(sysctl_udp_rmem_min),
743 .mode = 0644,
744 .proc_handler = proc_dointvec_minmax,
745 .extra1 = &one
746 },
747 {
748 .procname = "udp_wmem_min",
749 .data = &sysctl_udp_wmem_min,
750 .maxlen = sizeof(sysctl_udp_wmem_min),
751 .mode = 0644,
752 .proc_handler = proc_dointvec_minmax,
753 .extra1 = &one
754 },
755 { }
756 };
757
758 static struct ctl_table ipv4_net_table[] = {
759 {
760 .procname = "icmp_echo_ignore_all",
761 .data = &init_net.ipv4.sysctl_icmp_echo_ignore_all,
762 .maxlen = sizeof(int),
763 .mode = 0644,
764 .proc_handler = proc_dointvec
765 },
766 {
767 .procname = "icmp_echo_ignore_broadcasts",
768 .data = &init_net.ipv4.sysctl_icmp_echo_ignore_broadcasts,
769 .maxlen = sizeof(int),
770 .mode = 0644,
771 .proc_handler = proc_dointvec
772 },
773 {
774 .procname = "icmp_ignore_bogus_error_responses",
775 .data = &init_net.ipv4.sysctl_icmp_ignore_bogus_error_responses,
776 .maxlen = sizeof(int),
777 .mode = 0644,
778 .proc_handler = proc_dointvec
779 },
780 {
781 .procname = "icmp_errors_use_inbound_ifaddr",
782 .data = &init_net.ipv4.sysctl_icmp_errors_use_inbound_ifaddr,
783 .maxlen = sizeof(int),
784 .mode = 0644,
785 .proc_handler = proc_dointvec
786 },
787 {
788 .procname = "icmp_ratelimit",
789 .data = &init_net.ipv4.sysctl_icmp_ratelimit,
790 .maxlen = sizeof(int),
791 .mode = 0644,
792 .proc_handler = proc_dointvec_ms_jiffies,
793 },
794 {
795 .procname = "icmp_ratemask",
796 .data = &init_net.ipv4.sysctl_icmp_ratemask,
797 .maxlen = sizeof(int),
798 .mode = 0644,
799 .proc_handler = proc_dointvec
800 },
801 {
802 .procname = "ping_group_range",
803 .data = &init_net.ipv4.ping_group_range.range,
804 .maxlen = sizeof(gid_t)*2,
805 .mode = 0644,
806 .proc_handler = ipv4_ping_group_range,
807 },
808 {
809 .procname = "tcp_ecn",
810 .data = &init_net.ipv4.sysctl_tcp_ecn,
811 .maxlen = sizeof(int),
812 .mode = 0644,
813 .proc_handler = proc_dointvec
814 },
815 {
816 .procname = "tcp_ecn_fallback",
817 .data = &init_net.ipv4.sysctl_tcp_ecn_fallback,
818 .maxlen = sizeof(int),
819 .mode = 0644,
820 .proc_handler = proc_dointvec
821 },
822 {
823 .procname = "ip_local_port_range",
824 .maxlen = sizeof(init_net.ipv4.ip_local_ports.range),
825 .data = &init_net.ipv4.ip_local_ports.range,
826 .mode = 0644,
827 .proc_handler = ipv4_local_port_range,
828 },
829 {
830 .procname = "ip_local_reserved_ports",
831 .data = &init_net.ipv4.sysctl_local_reserved_ports,
832 .maxlen = 65536,
833 .mode = 0644,
834 .proc_handler = proc_do_large_bitmap,
835 },
836 {
837 .procname = "ip_no_pmtu_disc",
838 .data = &init_net.ipv4.sysctl_ip_no_pmtu_disc,
839 .maxlen = sizeof(int),
840 .mode = 0644,
841 .proc_handler = proc_dointvec
842 },
843 {
844 .procname = "ip_forward_use_pmtu",
845 .data = &init_net.ipv4.sysctl_ip_fwd_use_pmtu,
846 .maxlen = sizeof(int),
847 .mode = 0644,
848 .proc_handler = proc_dointvec,
849 },
850 {
851 .procname = "ip_nonlocal_bind",
852 .data = &init_net.ipv4.sysctl_ip_nonlocal_bind,
853 .maxlen = sizeof(int),
854 .mode = 0644,
855 .proc_handler = proc_dointvec
856 },
857 {
858 .procname = "fwmark_reflect",
859 .data = &init_net.ipv4.sysctl_fwmark_reflect,
860 .maxlen = sizeof(int),
861 .mode = 0644,
862 .proc_handler = proc_dointvec,
863 },
864 {
865 .procname = "tcp_fwmark_accept",
866 .data = &init_net.ipv4.sysctl_tcp_fwmark_accept,
867 .maxlen = sizeof(int),
868 .mode = 0644,
869 .proc_handler = proc_dointvec,
870 },
871 #ifdef CONFIG_NET_L3_MASTER_DEV
872 {
873 .procname = "tcp_l3mdev_accept",
874 .data = &init_net.ipv4.sysctl_tcp_l3mdev_accept,
875 .maxlen = sizeof(int),
876 .mode = 0644,
877 .proc_handler = proc_dointvec_minmax,
878 .extra1 = &zero,
879 .extra2 = &one,
880 },
881 #endif
882 {
883 .procname = "tcp_mtu_probing",
884 .data = &init_net.ipv4.sysctl_tcp_mtu_probing,
885 .maxlen = sizeof(int),
886 .mode = 0644,
887 .proc_handler = proc_dointvec,
888 },
889 {
890 .procname = "tcp_base_mss",
891 .data = &init_net.ipv4.sysctl_tcp_base_mss,
892 .maxlen = sizeof(int),
893 .mode = 0644,
894 .proc_handler = proc_dointvec,
895 },
896 {
897 .procname = "tcp_probe_threshold",
898 .data = &init_net.ipv4.sysctl_tcp_probe_threshold,
899 .maxlen = sizeof(int),
900 .mode = 0644,
901 .proc_handler = proc_dointvec,
902 },
903 {
904 .procname = "tcp_probe_interval",
905 .data = &init_net.ipv4.sysctl_tcp_probe_interval,
906 .maxlen = sizeof(int),
907 .mode = 0644,
908 .proc_handler = proc_dointvec,
909 },
910 {
911 .procname = "igmp_link_local_mcast_reports",
912 .data = &sysctl_igmp_llm_reports,
913 .maxlen = sizeof(int),
914 .mode = 0644,
915 .proc_handler = proc_dointvec
916 },
917 {
918 .procname = "tcp_keepalive_time",
919 .data = &init_net.ipv4.sysctl_tcp_keepalive_time,
920 .maxlen = sizeof(int),
921 .mode = 0644,
922 .proc_handler = proc_dointvec_jiffies,
923 },
924 {
925 .procname = "tcp_keepalive_probes",
926 .data = &init_net.ipv4.sysctl_tcp_keepalive_probes,
927 .maxlen = sizeof(int),
928 .mode = 0644,
929 .proc_handler = proc_dointvec
930 },
931 {
932 .procname = "tcp_keepalive_intvl",
933 .data = &init_net.ipv4.sysctl_tcp_keepalive_intvl,
934 .maxlen = sizeof(int),
935 .mode = 0644,
936 .proc_handler = proc_dointvec_jiffies,
937 },
938 {
939 .procname = "tcp_syn_retries",
940 .data = &init_net.ipv4.sysctl_tcp_syn_retries,
941 .maxlen = sizeof(int),
942 .mode = 0644,
943 .proc_handler = proc_dointvec_minmax,
944 .extra1 = &tcp_syn_retries_min,
945 .extra2 = &tcp_syn_retries_max
946 },
947 {
948 .procname = "tcp_synack_retries",
949 .data = &init_net.ipv4.sysctl_tcp_synack_retries,
950 .maxlen = sizeof(int),
951 .mode = 0644,
952 .proc_handler = proc_dointvec
953 },
954 #ifdef CONFIG_SYN_COOKIES
955 {
956 .procname = "tcp_syncookies",
957 .data = &init_net.ipv4.sysctl_tcp_syncookies,
958 .maxlen = sizeof(int),
959 .mode = 0644,
960 .proc_handler = proc_dointvec
961 },
962 #endif
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 return 0;
992
993 err_ports:
994 unregister_net_sysctl_table(net->ipv4.ipv4_hdr);
995 err_reg:
996 if (!net_eq(net, &init_net))
997 kfree(table);
998 err_alloc:
999 return -ENOMEM;
1000 }
1001
1002 static __net_exit void ipv4_sysctl_exit_net(struct net *net)
1003 {
1004 struct ctl_table *table;
1005
1006 kfree(net->ipv4.sysctl_local_reserved_ports);
1007 table = net->ipv4.ipv4_hdr->ctl_table_arg;
1008 unregister_net_sysctl_table(net->ipv4.ipv4_hdr);
1009 kfree(table);
1010 }
1011
1012 static __net_initdata struct pernet_operations ipv4_sysctl_ops = {
1013 .init = ipv4_sysctl_init_net,
1014 .exit = ipv4_sysctl_exit_net,
1015 };
1016
1017 static __init int sysctl_ipv4_init(void)
1018 {
1019 struct ctl_table_header *hdr;
1020
1021 hdr = register_net_sysctl(&init_net, "net/ipv4", ipv4_table);
1022 if (!hdr)
1023 return -ENOMEM;
1024
1025 if (register_pernet_subsys(&ipv4_sysctl_ops)) {
1026 unregister_net_sysctl_table(hdr);
1027 return -ENOMEM;
1028 }
1029
1030 return 0;
1031 }
1032
1033 __initcall(sysctl_ipv4_init);
Linux kernel - Deliverables
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