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net: Allow accepted sockets to be bound to l3mdev domain
[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 #include <net/tcp_memcontrol.h>
28
29 static int zero;
30 static int one = 1;
31 static int four = 4;
32 static int thousand = 1000;
33 static int gso_max_segs = GSO_MAX_SEGS;
34 static int tcp_retr1_max = 255;
35 static int ip_local_port_range_min[] = { 1, 1 };
36 static int ip_local_port_range_max[] = { 65535, 65535 };
37 static int tcp_adv_win_scale_min = -31;
38 static int tcp_adv_win_scale_max = 31;
39 static int ip_ttl_min = 1;
40 static int ip_ttl_max = 255;
41 static int tcp_syn_retries_min = 1;
42 static int tcp_syn_retries_max = MAX_TCP_SYNCNT;
43 static int ip_ping_group_range_min[] = { 0, 0 };
44 static int ip_ping_group_range_max[] = { GID_T_MAX, GID_T_MAX };
45
46 /* Update system visible IP port range */
47 static void set_local_port_range(struct net *net, int range[2])
48 {
49 bool same_parity = !((range[0] ^ range[1]) & 1);
50
51 write_seqlock_bh(&net->ipv4.ip_local_ports.lock);
52 if (same_parity && !net->ipv4.ip_local_ports.warned) {
53 net->ipv4.ip_local_ports.warned = true;
54 pr_err_ratelimited("ip_local_port_range: prefer different parity for start/end values.\n");
55 }
56 net->ipv4.ip_local_ports.range[0] = range[0];
57 net->ipv4.ip_local_ports.range[1] = range[1];
58 write_sequnlock_bh(&net->ipv4.ip_local_ports.lock);
59 }
60
61 /* Validate changes from /proc interface. */
62 static int ipv4_local_port_range(struct ctl_table *table, int write,
63 void __user *buffer,
64 size_t *lenp, loff_t *ppos)
65 {
66 struct net *net =
67 container_of(table->data, struct net, ipv4.ip_local_ports.range);
68 int ret;
69 int range[2];
70 struct ctl_table tmp = {
71 .data = &range,
72 .maxlen = sizeof(range),
73 .mode = table->mode,
74 .extra1 = &ip_local_port_range_min,
75 .extra2 = &ip_local_port_range_max,
76 };
77
78 inet_get_local_port_range(net, &range[0], &range[1]);
79
80 ret = proc_dointvec_minmax(&tmp, write, buffer, lenp, ppos);
81
82 if (write && ret == 0) {
83 if (range[1] < range[0])
84 ret = -EINVAL;
85 else
86 set_local_port_range(net, range);
87 }
88
89 return ret;
90 }
91
92
93 static void inet_get_ping_group_range_table(struct ctl_table *table, kgid_t *low, kgid_t *high)
94 {
95 kgid_t *data = table->data;
96 struct net *net =
97 container_of(table->data, struct net, ipv4.ping_group_range.range);
98 unsigned int seq;
99 do {
100 seq = read_seqbegin(&net->ipv4.ip_local_ports.lock);
101
102 *low = data[0];
103 *high = data[1];
104 } while (read_seqretry(&net->ipv4.ip_local_ports.lock, seq));
105 }
106
107 /* Update system visible IP port range */
108 static void set_ping_group_range(struct ctl_table *table, kgid_t low, kgid_t high)
109 {
110 kgid_t *data = table->data;
111 struct net *net =
112 container_of(table->data, struct net, ipv4.ping_group_range.range);
113 write_seqlock(&net->ipv4.ip_local_ports.lock);
114 data[0] = low;
115 data[1] = high;
116 write_sequnlock(&net->ipv4.ip_local_ports.lock);
117 }
118
119 /* Validate changes from /proc interface. */
120 static int ipv4_ping_group_range(struct ctl_table *table, int write,
121 void __user *buffer,
122 size_t *lenp, loff_t *ppos)
123 {
124 struct user_namespace *user_ns = current_user_ns();
125 int ret;
126 gid_t urange[2];
127 kgid_t low, high;
128 struct ctl_table tmp = {
129 .data = &urange,
130 .maxlen = sizeof(urange),
131 .mode = table->mode,
132 .extra1 = &ip_ping_group_range_min,
133 .extra2 = &ip_ping_group_range_max,
134 };
135
136 inet_get_ping_group_range_table(table, &low, &high);
137 urange[0] = from_kgid_munged(user_ns, low);
138 urange[1] = from_kgid_munged(user_ns, high);
139 ret = proc_dointvec_minmax(&tmp, write, buffer, lenp, ppos);
140
141 if (write && ret == 0) {
142 low = make_kgid(user_ns, urange[0]);
143 high = make_kgid(user_ns, urange[1]);
144 if (!gid_valid(low) || !gid_valid(high) ||
145 (urange[1] < urange[0]) || gid_lt(high, low)) {
146 low = make_kgid(&init_user_ns, 1);
147 high = make_kgid(&init_user_ns, 0);
148 }
149 set_ping_group_range(table, low, high);
150 }
151
152 return ret;
153 }
154
155 static int proc_tcp_congestion_control(struct ctl_table *ctl, int write,
156 void __user *buffer, size_t *lenp, loff_t *ppos)
157 {
158 char val[TCP_CA_NAME_MAX];
159 struct ctl_table tbl = {
160 .data = val,
161 .maxlen = TCP_CA_NAME_MAX,
162 };
163 int ret;
164
165 tcp_get_default_congestion_control(val);
166
167 ret = proc_dostring(&tbl, write, buffer, lenp, ppos);
168 if (write && ret == 0)
169 ret = tcp_set_default_congestion_control(val);
170 return ret;
171 }
172
173 static int proc_tcp_available_congestion_control(struct ctl_table *ctl,
174 int write,
175 void __user *buffer, size_t *lenp,
176 loff_t *ppos)
177 {
178 struct ctl_table tbl = { .maxlen = TCP_CA_BUF_MAX, };
179 int ret;
180
181 tbl.data = kmalloc(tbl.maxlen, GFP_USER);
182 if (!tbl.data)
183 return -ENOMEM;
184 tcp_get_available_congestion_control(tbl.data, TCP_CA_BUF_MAX);
185 ret = proc_dostring(&tbl, write, buffer, lenp, ppos);
186 kfree(tbl.data);
187 return ret;
188 }
189
190 static int proc_allowed_congestion_control(struct ctl_table *ctl,
191 int write,
192 void __user *buffer, size_t *lenp,
193 loff_t *ppos)
194 {
195 struct ctl_table tbl = { .maxlen = TCP_CA_BUF_MAX };
196 int ret;
197
198 tbl.data = kmalloc(tbl.maxlen, GFP_USER);
199 if (!tbl.data)
200 return -ENOMEM;
201
202 tcp_get_allowed_congestion_control(tbl.data, tbl.maxlen);
203 ret = proc_dostring(&tbl, write, buffer, lenp, ppos);
204 if (write && ret == 0)
205 ret = tcp_set_allowed_congestion_control(tbl.data);
206 kfree(tbl.data);
207 return ret;
208 }
209
210 static int proc_tcp_fastopen_key(struct ctl_table *ctl, int write,
211 void __user *buffer, size_t *lenp,
212 loff_t *ppos)
213 {
214 struct ctl_table tbl = { .maxlen = (TCP_FASTOPEN_KEY_LENGTH * 2 + 10) };
215 struct tcp_fastopen_context *ctxt;
216 int ret;
217 u32 user_key[4]; /* 16 bytes, matching TCP_FASTOPEN_KEY_LENGTH */
218
219 tbl.data = kmalloc(tbl.maxlen, GFP_KERNEL);
220 if (!tbl.data)
221 return -ENOMEM;
222
223 rcu_read_lock();
224 ctxt = rcu_dereference(tcp_fastopen_ctx);
225 if (ctxt)
226 memcpy(user_key, ctxt->key, TCP_FASTOPEN_KEY_LENGTH);
227 else
228 memset(user_key, 0, sizeof(user_key));
229 rcu_read_unlock();
230
231 snprintf(tbl.data, tbl.maxlen, "%08x-%08x-%08x-%08x",
232 user_key[0], user_key[1], user_key[2], user_key[3]);
233 ret = proc_dostring(&tbl, write, buffer, lenp, ppos);
234
235 if (write && ret == 0) {
236 if (sscanf(tbl.data, "%x-%x-%x-%x", user_key, user_key + 1,
237 user_key + 2, user_key + 3) != 4) {
238 ret = -EINVAL;
239 goto bad_key;
240 }
241 /* Generate a dummy secret but don't publish it. This
242 * is needed so we don't regenerate a new key on the
243 * first invocation of tcp_fastopen_cookie_gen
244 */
245 tcp_fastopen_init_key_once(false);
246 tcp_fastopen_reset_cipher(user_key, TCP_FASTOPEN_KEY_LENGTH);
247 }
248
249 bad_key:
250 pr_debug("proc FO key set 0x%x-%x-%x-%x <- 0x%s: %u\n",
251 user_key[0], user_key[1], user_key[2], user_key[3],
252 (char *)tbl.data, ret);
253 kfree(tbl.data);
254 return ret;
255 }
256
257 static struct ctl_table ipv4_table[] = {
258 {
259 .procname = "tcp_timestamps",
260 .data = &sysctl_tcp_timestamps,
261 .maxlen = sizeof(int),
262 .mode = 0644,
263 .proc_handler = proc_dointvec
264 },
265 {
266 .procname = "tcp_window_scaling",
267 .data = &sysctl_tcp_window_scaling,
268 .maxlen = sizeof(int),
269 .mode = 0644,
270 .proc_handler = proc_dointvec
271 },
272 {
273 .procname = "tcp_sack",
274 .data = &sysctl_tcp_sack,
275 .maxlen = sizeof(int),
276 .mode = 0644,
277 .proc_handler = proc_dointvec
278 },
279 {
280 .procname = "tcp_retrans_collapse",
281 .data = &sysctl_tcp_retrans_collapse,
282 .maxlen = sizeof(int),
283 .mode = 0644,
284 .proc_handler = proc_dointvec
285 },
286 {
287 .procname = "ip_default_ttl",
288 .data = &sysctl_ip_default_ttl,
289 .maxlen = sizeof(int),
290 .mode = 0644,
291 .proc_handler = proc_dointvec_minmax,
292 .extra1 = &ip_ttl_min,
293 .extra2 = &ip_ttl_max,
294 },
295 {
296 .procname = "tcp_syn_retries",
297 .data = &sysctl_tcp_syn_retries,
298 .maxlen = sizeof(int),
299 .mode = 0644,
300 .proc_handler = proc_dointvec_minmax,
301 .extra1 = &tcp_syn_retries_min,
302 .extra2 = &tcp_syn_retries_max
303 },
304 {
305 .procname = "tcp_synack_retries",
306 .data = &sysctl_tcp_synack_retries,
307 .maxlen = sizeof(int),
308 .mode = 0644,
309 .proc_handler = proc_dointvec
310 },
311 {
312 .procname = "tcp_max_orphans",
313 .data = &sysctl_tcp_max_orphans,
314 .maxlen = sizeof(int),
315 .mode = 0644,
316 .proc_handler = proc_dointvec
317 },
318 {
319 .procname = "tcp_max_tw_buckets",
320 .data = &tcp_death_row.sysctl_max_tw_buckets,
321 .maxlen = sizeof(int),
322 .mode = 0644,
323 .proc_handler = proc_dointvec
324 },
325 {
326 .procname = "ip_early_demux",
327 .data = &sysctl_ip_early_demux,
328 .maxlen = sizeof(int),
329 .mode = 0644,
330 .proc_handler = proc_dointvec
331 },
332 {
333 .procname = "ip_dynaddr",
334 .data = &sysctl_ip_dynaddr,
335 .maxlen = sizeof(int),
336 .mode = 0644,
337 .proc_handler = proc_dointvec
338 },
339 {
340 .procname = "tcp_keepalive_time",
341 .data = &sysctl_tcp_keepalive_time,
342 .maxlen = sizeof(int),
343 .mode = 0644,
344 .proc_handler = proc_dointvec_jiffies,
345 },
346 {
347 .procname = "tcp_keepalive_probes",
348 .data = &sysctl_tcp_keepalive_probes,
349 .maxlen = sizeof(int),
350 .mode = 0644,
351 .proc_handler = proc_dointvec
352 },
353 {
354 .procname = "tcp_keepalive_intvl",
355 .data = &sysctl_tcp_keepalive_intvl,
356 .maxlen = sizeof(int),
357 .mode = 0644,
358 .proc_handler = proc_dointvec_jiffies,
359 },
360 {
361 .procname = "tcp_retries1",
362 .data = &sysctl_tcp_retries1,
363 .maxlen = sizeof(int),
364 .mode = 0644,
365 .proc_handler = proc_dointvec_minmax,
366 .extra2 = &tcp_retr1_max
367 },
368 {
369 .procname = "tcp_retries2",
370 .data = &sysctl_tcp_retries2,
371 .maxlen = sizeof(int),
372 .mode = 0644,
373 .proc_handler = proc_dointvec
374 },
375 {
376 .procname = "tcp_fin_timeout",
377 .data = &sysctl_tcp_fin_timeout,
378 .maxlen = sizeof(int),
379 .mode = 0644,
380 .proc_handler = proc_dointvec_jiffies,
381 },
382 #ifdef CONFIG_SYN_COOKIES
383 {
384 .procname = "tcp_syncookies",
385 .data = &sysctl_tcp_syncookies,
386 .maxlen = sizeof(int),
387 .mode = 0644,
388 .proc_handler = proc_dointvec
389 },
390 #endif
391 {
392 .procname = "tcp_fastopen",
393 .data = &sysctl_tcp_fastopen,
394 .maxlen = sizeof(int),
395 .mode = 0644,
396 .proc_handler = proc_dointvec,
397 },
398 {
399 .procname = "tcp_fastopen_key",
400 .mode = 0600,
401 .maxlen = ((TCP_FASTOPEN_KEY_LENGTH * 2) + 10),
402 .proc_handler = proc_tcp_fastopen_key,
403 },
404 {
405 .procname = "tcp_tw_recycle",
406 .data = &tcp_death_row.sysctl_tw_recycle,
407 .maxlen = sizeof(int),
408 .mode = 0644,
409 .proc_handler = proc_dointvec
410 },
411 {
412 .procname = "tcp_abort_on_overflow",
413 .data = &sysctl_tcp_abort_on_overflow,
414 .maxlen = sizeof(int),
415 .mode = 0644,
416 .proc_handler = proc_dointvec
417 },
418 {
419 .procname = "tcp_stdurg",
420 .data = &sysctl_tcp_stdurg,
421 .maxlen = sizeof(int),
422 .mode = 0644,
423 .proc_handler = proc_dointvec
424 },
425 {
426 .procname = "tcp_rfc1337",
427 .data = &sysctl_tcp_rfc1337,
428 .maxlen = sizeof(int),
429 .mode = 0644,
430 .proc_handler = proc_dointvec
431 },
432 {
433 .procname = "tcp_max_syn_backlog",
434 .data = &sysctl_max_syn_backlog,
435 .maxlen = sizeof(int),
436 .mode = 0644,
437 .proc_handler = proc_dointvec
438 },
439 {
440 .procname = "igmp_max_memberships",
441 .data = &sysctl_igmp_max_memberships,
442 .maxlen = sizeof(int),
443 .mode = 0644,
444 .proc_handler = proc_dointvec
445 },
446 {
447 .procname = "igmp_max_msf",
448 .data = &sysctl_igmp_max_msf,
449 .maxlen = sizeof(int),
450 .mode = 0644,
451 .proc_handler = proc_dointvec
452 },
453 #ifdef CONFIG_IP_MULTICAST
454 {
455 .procname = "igmp_qrv",
456 .data = &sysctl_igmp_qrv,
457 .maxlen = sizeof(int),
458 .mode = 0644,
459 .proc_handler = proc_dointvec_minmax,
460 .extra1 = &one
461 },
462 #endif
463 {
464 .procname = "inet_peer_threshold",
465 .data = &inet_peer_threshold,
466 .maxlen = sizeof(int),
467 .mode = 0644,
468 .proc_handler = proc_dointvec
469 },
470 {
471 .procname = "inet_peer_minttl",
472 .data = &inet_peer_minttl,
473 .maxlen = sizeof(int),
474 .mode = 0644,
475 .proc_handler = proc_dointvec_jiffies,
476 },
477 {
478 .procname = "inet_peer_maxttl",
479 .data = &inet_peer_maxttl,
480 .maxlen = sizeof(int),
481 .mode = 0644,
482 .proc_handler = proc_dointvec_jiffies,
483 },
484 {
485 .procname = "tcp_orphan_retries",
486 .data = &sysctl_tcp_orphan_retries,
487 .maxlen = sizeof(int),
488 .mode = 0644,
489 .proc_handler = proc_dointvec
490 },
491 {
492 .procname = "tcp_fack",
493 .data = &sysctl_tcp_fack,
494 .maxlen = sizeof(int),
495 .mode = 0644,
496 .proc_handler = proc_dointvec
497 },
498 {
499 .procname = "tcp_recovery",
500 .data = &sysctl_tcp_recovery,
501 .maxlen = sizeof(int),
502 .mode = 0644,
503 .proc_handler = proc_dointvec,
504 },
505 {
506 .procname = "tcp_reordering",
507 .data = &sysctl_tcp_reordering,
508 .maxlen = sizeof(int),
509 .mode = 0644,
510 .proc_handler = proc_dointvec
511 },
512 {
513 .procname = "tcp_max_reordering",
514 .data = &sysctl_tcp_max_reordering,
515 .maxlen = sizeof(int),
516 .mode = 0644,
517 .proc_handler = proc_dointvec
518 },
519 {
520 .procname = "tcp_dsack",
521 .data = &sysctl_tcp_dsack,
522 .maxlen = sizeof(int),
523 .mode = 0644,
524 .proc_handler = proc_dointvec
525 },
526 {
527 .procname = "tcp_mem",
528 .maxlen = sizeof(sysctl_tcp_mem),
529 .data = &sysctl_tcp_mem,
530 .mode = 0644,
531 .proc_handler = proc_doulongvec_minmax,
532 },
533 {
534 .procname = "tcp_wmem",
535 .data = &sysctl_tcp_wmem,
536 .maxlen = sizeof(sysctl_tcp_wmem),
537 .mode = 0644,
538 .proc_handler = proc_dointvec_minmax,
539 .extra1 = &one,
540 },
541 {
542 .procname = "tcp_notsent_lowat",
543 .data = &sysctl_tcp_notsent_lowat,
544 .maxlen = sizeof(sysctl_tcp_notsent_lowat),
545 .mode = 0644,
546 .proc_handler = proc_dointvec,
547 },
548 {
549 .procname = "tcp_rmem",
550 .data = &sysctl_tcp_rmem,
551 .maxlen = sizeof(sysctl_tcp_rmem),
552 .mode = 0644,
553 .proc_handler = proc_dointvec_minmax,
554 .extra1 = &one,
555 },
556 {
557 .procname = "tcp_app_win",
558 .data = &sysctl_tcp_app_win,
559 .maxlen = sizeof(int),
560 .mode = 0644,
561 .proc_handler = proc_dointvec
562 },
563 {
564 .procname = "tcp_adv_win_scale",
565 .data = &sysctl_tcp_adv_win_scale,
566 .maxlen = sizeof(int),
567 .mode = 0644,
568 .proc_handler = proc_dointvec_minmax,
569 .extra1 = &tcp_adv_win_scale_min,
570 .extra2 = &tcp_adv_win_scale_max,
571 },
572 {
573 .procname = "tcp_tw_reuse",
574 .data = &sysctl_tcp_tw_reuse,
575 .maxlen = sizeof(int),
576 .mode = 0644,
577 .proc_handler = proc_dointvec
578 },
579 {
580 .procname = "tcp_frto",
581 .data = &sysctl_tcp_frto,
582 .maxlen = sizeof(int),
583 .mode = 0644,
584 .proc_handler = proc_dointvec
585 },
586 {
587 .procname = "tcp_min_rtt_wlen",
588 .data = &sysctl_tcp_min_rtt_wlen,
589 .maxlen = sizeof(int),
590 .mode = 0644,
591 .proc_handler = proc_dointvec
592 },
593 {
594 .procname = "tcp_low_latency",
595 .data = &sysctl_tcp_low_latency,
596 .maxlen = sizeof(int),
597 .mode = 0644,
598 .proc_handler = proc_dointvec
599 },
600 {
601 .procname = "tcp_no_metrics_save",
602 .data = &sysctl_tcp_nometrics_save,
603 .maxlen = sizeof(int),
604 .mode = 0644,
605 .proc_handler = proc_dointvec,
606 },
607 {
608 .procname = "tcp_moderate_rcvbuf",
609 .data = &sysctl_tcp_moderate_rcvbuf,
610 .maxlen = sizeof(int),
611 .mode = 0644,
612 .proc_handler = proc_dointvec,
613 },
614 {
615 .procname = "tcp_tso_win_divisor",
616 .data = &sysctl_tcp_tso_win_divisor,
617 .maxlen = sizeof(int),
618 .mode = 0644,
619 .proc_handler = proc_dointvec,
620 },
621 {
622 .procname = "tcp_congestion_control",
623 .mode = 0644,
624 .maxlen = TCP_CA_NAME_MAX,
625 .proc_handler = proc_tcp_congestion_control,
626 },
627 {
628 .procname = "tcp_workaround_signed_windows",
629 .data = &sysctl_tcp_workaround_signed_windows,
630 .maxlen = sizeof(int),
631 .mode = 0644,
632 .proc_handler = proc_dointvec
633 },
634 {
635 .procname = "tcp_limit_output_bytes",
636 .data = &sysctl_tcp_limit_output_bytes,
637 .maxlen = sizeof(int),
638 .mode = 0644,
639 .proc_handler = proc_dointvec
640 },
641 {
642 .procname = "tcp_challenge_ack_limit",
643 .data = &sysctl_tcp_challenge_ack_limit,
644 .maxlen = sizeof(int),
645 .mode = 0644,
646 .proc_handler = proc_dointvec
647 },
648 {
649 .procname = "tcp_slow_start_after_idle",
650 .data = &sysctl_tcp_slow_start_after_idle,
651 .maxlen = sizeof(int),
652 .mode = 0644,
653 .proc_handler = proc_dointvec
654 },
655 #ifdef CONFIG_NETLABEL
656 {
657 .procname = "cipso_cache_enable",
658 .data = &cipso_v4_cache_enabled,
659 .maxlen = sizeof(int),
660 .mode = 0644,
661 .proc_handler = proc_dointvec,
662 },
663 {
664 .procname = "cipso_cache_bucket_size",
665 .data = &cipso_v4_cache_bucketsize,
666 .maxlen = sizeof(int),
667 .mode = 0644,
668 .proc_handler = proc_dointvec,
669 },
670 {
671 .procname = "cipso_rbm_optfmt",
672 .data = &cipso_v4_rbm_optfmt,
673 .maxlen = sizeof(int),
674 .mode = 0644,
675 .proc_handler = proc_dointvec,
676 },
677 {
678 .procname = "cipso_rbm_strictvalid",
679 .data = &cipso_v4_rbm_strictvalid,
680 .maxlen = sizeof(int),
681 .mode = 0644,
682 .proc_handler = proc_dointvec,
683 },
684 #endif /* CONFIG_NETLABEL */
685 {
686 .procname = "tcp_available_congestion_control",
687 .maxlen = TCP_CA_BUF_MAX,
688 .mode = 0444,
689 .proc_handler = proc_tcp_available_congestion_control,
690 },
691 {
692 .procname = "tcp_allowed_congestion_control",
693 .maxlen = TCP_CA_BUF_MAX,
694 .mode = 0644,
695 .proc_handler = proc_allowed_congestion_control,
696 },
697 {
698 .procname = "tcp_thin_linear_timeouts",
699 .data = &sysctl_tcp_thin_linear_timeouts,
700 .maxlen = sizeof(int),
701 .mode = 0644,
702 .proc_handler = proc_dointvec
703 },
704 {
705 .procname = "tcp_thin_dupack",
706 .data = &sysctl_tcp_thin_dupack,
707 .maxlen = sizeof(int),
708 .mode = 0644,
709 .proc_handler = proc_dointvec
710 },
711 {
712 .procname = "tcp_early_retrans",
713 .data = &sysctl_tcp_early_retrans,
714 .maxlen = sizeof(int),
715 .mode = 0644,
716 .proc_handler = proc_dointvec_minmax,
717 .extra1 = &zero,
718 .extra2 = &four,
719 },
720 {
721 .procname = "tcp_min_tso_segs",
722 .data = &sysctl_tcp_min_tso_segs,
723 .maxlen = sizeof(int),
724 .mode = 0644,
725 .proc_handler = proc_dointvec_minmax,
726 .extra1 = &one,
727 .extra2 = &gso_max_segs,
728 },
729 {
730 .procname = "tcp_pacing_ss_ratio",
731 .data = &sysctl_tcp_pacing_ss_ratio,
732 .maxlen = sizeof(int),
733 .mode = 0644,
734 .proc_handler = proc_dointvec_minmax,
735 .extra1 = &zero,
736 .extra2 = &thousand,
737 },
738 {
739 .procname = "tcp_pacing_ca_ratio",
740 .data = &sysctl_tcp_pacing_ca_ratio,
741 .maxlen = sizeof(int),
742 .mode = 0644,
743 .proc_handler = proc_dointvec_minmax,
744 .extra1 = &zero,
745 .extra2 = &thousand,
746 },
747 {
748 .procname = "tcp_autocorking",
749 .data = &sysctl_tcp_autocorking,
750 .maxlen = sizeof(int),
751 .mode = 0644,
752 .proc_handler = proc_dointvec_minmax,
753 .extra1 = &zero,
754 .extra2 = &one,
755 },
756 {
757 .procname = "tcp_invalid_ratelimit",
758 .data = &sysctl_tcp_invalid_ratelimit,
759 .maxlen = sizeof(int),
760 .mode = 0644,
761 .proc_handler = proc_dointvec_ms_jiffies,
762 },
763 {
764 .procname = "icmp_msgs_per_sec",
765 .data = &sysctl_icmp_msgs_per_sec,
766 .maxlen = sizeof(int),
767 .mode = 0644,
768 .proc_handler = proc_dointvec_minmax,
769 .extra1 = &zero,
770 },
771 {
772 .procname = "icmp_msgs_burst",
773 .data = &sysctl_icmp_msgs_burst,
774 .maxlen = sizeof(int),
775 .mode = 0644,
776 .proc_handler = proc_dointvec_minmax,
777 .extra1 = &zero,
778 },
779 {
780 .procname = "udp_mem",
781 .data = &sysctl_udp_mem,
782 .maxlen = sizeof(sysctl_udp_mem),
783 .mode = 0644,
784 .proc_handler = proc_doulongvec_minmax,
785 },
786 {
787 .procname = "udp_rmem_min",
788 .data = &sysctl_udp_rmem_min,
789 .maxlen = sizeof(sysctl_udp_rmem_min),
790 .mode = 0644,
791 .proc_handler = proc_dointvec_minmax,
792 .extra1 = &one
793 },
794 {
795 .procname = "udp_wmem_min",
796 .data = &sysctl_udp_wmem_min,
797 .maxlen = sizeof(sysctl_udp_wmem_min),
798 .mode = 0644,
799 .proc_handler = proc_dointvec_minmax,
800 .extra1 = &one
801 },
802 { }
803 };
804
805 static struct ctl_table ipv4_net_table[] = {
806 {
807 .procname = "icmp_echo_ignore_all",
808 .data = &init_net.ipv4.sysctl_icmp_echo_ignore_all,
809 .maxlen = sizeof(int),
810 .mode = 0644,
811 .proc_handler = proc_dointvec
812 },
813 {
814 .procname = "icmp_echo_ignore_broadcasts",
815 .data = &init_net.ipv4.sysctl_icmp_echo_ignore_broadcasts,
816 .maxlen = sizeof(int),
817 .mode = 0644,
818 .proc_handler = proc_dointvec
819 },
820 {
821 .procname = "icmp_ignore_bogus_error_responses",
822 .data = &init_net.ipv4.sysctl_icmp_ignore_bogus_error_responses,
823 .maxlen = sizeof(int),
824 .mode = 0644,
825 .proc_handler = proc_dointvec
826 },
827 {
828 .procname = "icmp_errors_use_inbound_ifaddr",
829 .data = &init_net.ipv4.sysctl_icmp_errors_use_inbound_ifaddr,
830 .maxlen = sizeof(int),
831 .mode = 0644,
832 .proc_handler = proc_dointvec
833 },
834 {
835 .procname = "icmp_ratelimit",
836 .data = &init_net.ipv4.sysctl_icmp_ratelimit,
837 .maxlen = sizeof(int),
838 .mode = 0644,
839 .proc_handler = proc_dointvec_ms_jiffies,
840 },
841 {
842 .procname = "icmp_ratemask",
843 .data = &init_net.ipv4.sysctl_icmp_ratemask,
844 .maxlen = sizeof(int),
845 .mode = 0644,
846 .proc_handler = proc_dointvec
847 },
848 {
849 .procname = "ping_group_range",
850 .data = &init_net.ipv4.ping_group_range.range,
851 .maxlen = sizeof(gid_t)*2,
852 .mode = 0644,
853 .proc_handler = ipv4_ping_group_range,
854 },
855 {
856 .procname = "tcp_ecn",
857 .data = &init_net.ipv4.sysctl_tcp_ecn,
858 .maxlen = sizeof(int),
859 .mode = 0644,
860 .proc_handler = proc_dointvec
861 },
862 {
863 .procname = "tcp_ecn_fallback",
864 .data = &init_net.ipv4.sysctl_tcp_ecn_fallback,
865 .maxlen = sizeof(int),
866 .mode = 0644,
867 .proc_handler = proc_dointvec
868 },
869 {
870 .procname = "ip_local_port_range",
871 .maxlen = sizeof(init_net.ipv4.ip_local_ports.range),
872 .data = &init_net.ipv4.ip_local_ports.range,
873 .mode = 0644,
874 .proc_handler = ipv4_local_port_range,
875 },
876 {
877 .procname = "ip_local_reserved_ports",
878 .data = &init_net.ipv4.sysctl_local_reserved_ports,
879 .maxlen = 65536,
880 .mode = 0644,
881 .proc_handler = proc_do_large_bitmap,
882 },
883 {
884 .procname = "ip_no_pmtu_disc",
885 .data = &init_net.ipv4.sysctl_ip_no_pmtu_disc,
886 .maxlen = sizeof(int),
887 .mode = 0644,
888 .proc_handler = proc_dointvec
889 },
890 {
891 .procname = "ip_forward_use_pmtu",
892 .data = &init_net.ipv4.sysctl_ip_fwd_use_pmtu,
893 .maxlen = sizeof(int),
894 .mode = 0644,
895 .proc_handler = proc_dointvec,
896 },
897 {
898 .procname = "ip_nonlocal_bind",
899 .data = &init_net.ipv4.sysctl_ip_nonlocal_bind,
900 .maxlen = sizeof(int),
901 .mode = 0644,
902 .proc_handler = proc_dointvec
903 },
904 {
905 .procname = "fwmark_reflect",
906 .data = &init_net.ipv4.sysctl_fwmark_reflect,
907 .maxlen = sizeof(int),
908 .mode = 0644,
909 .proc_handler = proc_dointvec,
910 },
911 {
912 .procname = "tcp_fwmark_accept",
913 .data = &init_net.ipv4.sysctl_tcp_fwmark_accept,
914 .maxlen = sizeof(int),
915 .mode = 0644,
916 .proc_handler = proc_dointvec,
917 },
918 #ifdef CONFIG_NET_L3_MASTER_DEV
919 {
920 .procname = "tcp_l3mdev_accept",
921 .data = &init_net.ipv4.sysctl_tcp_l3mdev_accept,
922 .maxlen = sizeof(int),
923 .mode = 0644,
924 .proc_handler = proc_dointvec_minmax,
925 .extra1 = &zero,
926 .extra2 = &one,
927 },
928 #endif
929 {
930 .procname = "tcp_mtu_probing",
931 .data = &init_net.ipv4.sysctl_tcp_mtu_probing,
932 .maxlen = sizeof(int),
933 .mode = 0644,
934 .proc_handler = proc_dointvec,
935 },
936 {
937 .procname = "tcp_base_mss",
938 .data = &init_net.ipv4.sysctl_tcp_base_mss,
939 .maxlen = sizeof(int),
940 .mode = 0644,
941 .proc_handler = proc_dointvec,
942 },
943 {
944 .procname = "tcp_probe_threshold",
945 .data = &init_net.ipv4.sysctl_tcp_probe_threshold,
946 .maxlen = sizeof(int),
947 .mode = 0644,
948 .proc_handler = proc_dointvec,
949 },
950 {
951 .procname = "tcp_probe_interval",
952 .data = &init_net.ipv4.sysctl_tcp_probe_interval,
953 .maxlen = sizeof(int),
954 .mode = 0644,
955 .proc_handler = proc_dointvec,
956 },
957 {
958 .procname = "igmp_link_local_mcast_reports",
959 .data = &sysctl_igmp_llm_reports,
960 .maxlen = sizeof(int),
961 .mode = 0644,
962 .proc_handler = proc_dointvec
963 },
964 { }
965 };
966
967 static __net_init int ipv4_sysctl_init_net(struct net *net)
968 {
969 struct ctl_table *table;
970
971 table = ipv4_net_table;
972 if (!net_eq(net, &init_net)) {
973 int i;
974
975 table = kmemdup(table, sizeof(ipv4_net_table), GFP_KERNEL);
976 if (!table)
977 goto err_alloc;
978
979 /* Update the variables to point into the current struct net */
980 for (i = 0; i < ARRAY_SIZE(ipv4_net_table) - 1; i++)
981 table[i].data += (void *)net - (void *)&init_net;
982 }
983
984 net->ipv4.ipv4_hdr = register_net_sysctl(net, "net/ipv4", table);
985 if (!net->ipv4.ipv4_hdr)
986 goto err_reg;
987
988 net->ipv4.sysctl_local_reserved_ports = kzalloc(65536 / 8, GFP_KERNEL);
989 if (!net->ipv4.sysctl_local_reserved_ports)
990 goto err_ports;
991
992 return 0;
993
994 err_ports:
995 unregister_net_sysctl_table(net->ipv4.ipv4_hdr);
996 err_reg:
997 if (!net_eq(net, &init_net))
998 kfree(table);
999 err_alloc:
1000 return -ENOMEM;
1001 }
1002
1003 static __net_exit void ipv4_sysctl_exit_net(struct net *net)
1004 {
1005 struct ctl_table *table;
1006
1007 kfree(net->ipv4.sysctl_local_reserved_ports);
1008 table = net->ipv4.ipv4_hdr->ctl_table_arg;
1009 unregister_net_sysctl_table(net->ipv4.ipv4_hdr);
1010 kfree(table);
1011 }
1012
1013 static __net_initdata struct pernet_operations ipv4_sysctl_ops = {
1014 .init = ipv4_sysctl_init_net,
1015 .exit = ipv4_sysctl_exit_net,
1016 };
1017
1018 static __init int sysctl_ipv4_init(void)
1019 {
1020 struct ctl_table_header *hdr;
1021
1022 hdr = register_net_sysctl(&init_net, "net/ipv4", ipv4_table);
1023 if (!hdr)
1024 return -ENOMEM;
1025
1026 if (register_pernet_subsys(&ipv4_sysctl_ops)) {
1027 unregister_net_sysctl_table(hdr);
1028 return -ENOMEM;
1029 }
1030
1031 return 0;
1032 }
1033
1034 __initcall(sysctl_ipv4_init);
Linux kernel - Deliverables
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