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