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ipv4: gso: make inet_gso_segment() stackable
[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 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 write_seqlock(&net->ipv4.sysctl_local_ports.lock);
49 net->ipv4.sysctl_local_ports.range[0] = range[0];
50 net->ipv4.sysctl_local_ports.range[1] = range[1];
51 write_sequnlock(&net->ipv4.sysctl_local_ports.lock);
52 }
53
54 /* Validate changes from /proc interface. */
55 static int ipv4_local_port_range(struct ctl_table *table, int write,
56 void __user *buffer,
57 size_t *lenp, loff_t *ppos)
58 {
59 struct net *net =
60 container_of(table->data, struct net, ipv4.sysctl_local_ports.range);
61 int ret;
62 int range[2];
63 struct ctl_table tmp = {
64 .data = &range,
65 .maxlen = sizeof(range),
66 .mode = table->mode,
67 .extra1 = &ip_local_port_range_min,
68 .extra2 = &ip_local_port_range_max,
69 };
70
71 inet_get_local_port_range(net, &range[0], &range[1]);
72
73 ret = proc_dointvec_minmax(&tmp, write, buffer, lenp, ppos);
74
75 if (write && ret == 0) {
76 if (range[1] < range[0])
77 ret = -EINVAL;
78 else
79 set_local_port_range(net, range);
80 }
81
82 return ret;
83 }
84
85
86 static void inet_get_ping_group_range_table(struct ctl_table *table, kgid_t *low, kgid_t *high)
87 {
88 kgid_t *data = table->data;
89 struct net *net =
90 container_of(table->data, struct net, ipv4.sysctl_ping_group_range);
91 unsigned int seq;
92 do {
93 seq = read_seqbegin(&net->ipv4.sysctl_local_ports.lock);
94
95 *low = data[0];
96 *high = data[1];
97 } while (read_seqretry(&net->ipv4.sysctl_local_ports.lock, seq));
98 }
99
100 /* Update system visible IP port range */
101 static void set_ping_group_range(struct ctl_table *table, kgid_t low, kgid_t high)
102 {
103 kgid_t *data = table->data;
104 struct net *net =
105 container_of(table->data, struct net, ipv4.sysctl_ping_group_range);
106 write_seqlock(&net->ipv4.sysctl_local_ports.lock);
107 data[0] = low;
108 data[1] = high;
109 write_sequnlock(&net->ipv4.sysctl_local_ports.lock);
110 }
111
112 /* Validate changes from /proc interface. */
113 static int ipv4_ping_group_range(struct ctl_table *table, int write,
114 void __user *buffer,
115 size_t *lenp, loff_t *ppos)
116 {
117 struct user_namespace *user_ns = current_user_ns();
118 int ret;
119 gid_t urange[2];
120 kgid_t low, high;
121 struct ctl_table tmp = {
122 .data = &urange,
123 .maxlen = sizeof(urange),
124 .mode = table->mode,
125 .extra1 = &ip_ping_group_range_min,
126 .extra2 = &ip_ping_group_range_max,
127 };
128
129 inet_get_ping_group_range_table(table, &low, &high);
130 urange[0] = from_kgid_munged(user_ns, low);
131 urange[1] = from_kgid_munged(user_ns, high);
132 ret = proc_dointvec_minmax(&tmp, write, buffer, lenp, ppos);
133
134 if (write && ret == 0) {
135 low = make_kgid(user_ns, urange[0]);
136 high = make_kgid(user_ns, urange[1]);
137 if (!gid_valid(low) || !gid_valid(high) ||
138 (urange[1] < urange[0]) || gid_lt(high, low)) {
139 low = make_kgid(&init_user_ns, 1);
140 high = make_kgid(&init_user_ns, 0);
141 }
142 set_ping_group_range(table, low, high);
143 }
144
145 return ret;
146 }
147
148 static int proc_tcp_congestion_control(struct ctl_table *ctl, int write,
149 void __user *buffer, size_t *lenp, loff_t *ppos)
150 {
151 char val[TCP_CA_NAME_MAX];
152 struct ctl_table tbl = {
153 .data = val,
154 .maxlen = TCP_CA_NAME_MAX,
155 };
156 int ret;
157
158 tcp_get_default_congestion_control(val);
159
160 ret = proc_dostring(&tbl, write, buffer, lenp, ppos);
161 if (write && ret == 0)
162 ret = tcp_set_default_congestion_control(val);
163 return ret;
164 }
165
166 static int proc_tcp_available_congestion_control(struct ctl_table *ctl,
167 int write,
168 void __user *buffer, size_t *lenp,
169 loff_t *ppos)
170 {
171 struct ctl_table tbl = { .maxlen = TCP_CA_BUF_MAX, };
172 int ret;
173
174 tbl.data = kmalloc(tbl.maxlen, GFP_USER);
175 if (!tbl.data)
176 return -ENOMEM;
177 tcp_get_available_congestion_control(tbl.data, TCP_CA_BUF_MAX);
178 ret = proc_dostring(&tbl, write, buffer, lenp, ppos);
179 kfree(tbl.data);
180 return ret;
181 }
182
183 static int proc_allowed_congestion_control(struct ctl_table *ctl,
184 int write,
185 void __user *buffer, size_t *lenp,
186 loff_t *ppos)
187 {
188 struct ctl_table tbl = { .maxlen = TCP_CA_BUF_MAX };
189 int ret;
190
191 tbl.data = kmalloc(tbl.maxlen, GFP_USER);
192 if (!tbl.data)
193 return -ENOMEM;
194
195 tcp_get_allowed_congestion_control(tbl.data, tbl.maxlen);
196 ret = proc_dostring(&tbl, write, buffer, lenp, ppos);
197 if (write && ret == 0)
198 ret = tcp_set_allowed_congestion_control(tbl.data);
199 kfree(tbl.data);
200 return ret;
201 }
202
203 static int ipv4_tcp_mem(struct ctl_table *ctl, int write,
204 void __user *buffer, size_t *lenp,
205 loff_t *ppos)
206 {
207 int ret;
208 unsigned long vec[3];
209 struct net *net = current->nsproxy->net_ns;
210 #ifdef CONFIG_MEMCG_KMEM
211 struct mem_cgroup *memcg;
212 #endif
213
214 struct ctl_table tmp = {
215 .data = &vec,
216 .maxlen = sizeof(vec),
217 .mode = ctl->mode,
218 };
219
220 if (!write) {
221 ctl->data = &net->ipv4.sysctl_tcp_mem;
222 return proc_doulongvec_minmax(ctl, write, buffer, lenp, ppos);
223 }
224
225 ret = proc_doulongvec_minmax(&tmp, write, buffer, lenp, ppos);
226 if (ret)
227 return ret;
228
229 #ifdef CONFIG_MEMCG_KMEM
230 rcu_read_lock();
231 memcg = mem_cgroup_from_task(current);
232
233 tcp_prot_mem(memcg, vec[0], 0);
234 tcp_prot_mem(memcg, vec[1], 1);
235 tcp_prot_mem(memcg, vec[2], 2);
236 rcu_read_unlock();
237 #endif
238
239 net->ipv4.sysctl_tcp_mem[0] = vec[0];
240 net->ipv4.sysctl_tcp_mem[1] = vec[1];
241 net->ipv4.sysctl_tcp_mem[2] = vec[2];
242
243 return 0;
244 }
245
246 static int proc_tcp_fastopen_key(struct ctl_table *ctl, int write,
247 void __user *buffer, size_t *lenp,
248 loff_t *ppos)
249 {
250 struct ctl_table tbl = { .maxlen = (TCP_FASTOPEN_KEY_LENGTH * 2 + 10) };
251 struct tcp_fastopen_context *ctxt;
252 int ret;
253 u32 user_key[4]; /* 16 bytes, matching TCP_FASTOPEN_KEY_LENGTH */
254
255 tbl.data = kmalloc(tbl.maxlen, GFP_KERNEL);
256 if (!tbl.data)
257 return -ENOMEM;
258
259 rcu_read_lock();
260 ctxt = rcu_dereference(tcp_fastopen_ctx);
261 if (ctxt)
262 memcpy(user_key, ctxt->key, TCP_FASTOPEN_KEY_LENGTH);
263 else
264 memset(user_key, 0, sizeof(user_key));
265 rcu_read_unlock();
266
267 snprintf(tbl.data, tbl.maxlen, "%08x-%08x-%08x-%08x",
268 user_key[0], user_key[1], user_key[2], user_key[3]);
269 ret = proc_dostring(&tbl, write, buffer, lenp, ppos);
270
271 if (write && ret == 0) {
272 if (sscanf(tbl.data, "%x-%x-%x-%x", user_key, user_key + 1,
273 user_key + 2, user_key + 3) != 4) {
274 ret = -EINVAL;
275 goto bad_key;
276 }
277 tcp_fastopen_reset_cipher(user_key, TCP_FASTOPEN_KEY_LENGTH);
278 }
279
280 bad_key:
281 pr_debug("proc FO key set 0x%x-%x-%x-%x <- 0x%s: %u\n",
282 user_key[0], user_key[1], user_key[2], user_key[3],
283 (char *)tbl.data, ret);
284 kfree(tbl.data);
285 return ret;
286 }
287
288 static struct ctl_table ipv4_table[] = {
289 {
290 .procname = "tcp_timestamps",
291 .data = &sysctl_tcp_timestamps,
292 .maxlen = sizeof(int),
293 .mode = 0644,
294 .proc_handler = proc_dointvec
295 },
296 {
297 .procname = "tcp_window_scaling",
298 .data = &sysctl_tcp_window_scaling,
299 .maxlen = sizeof(int),
300 .mode = 0644,
301 .proc_handler = proc_dointvec
302 },
303 {
304 .procname = "tcp_sack",
305 .data = &sysctl_tcp_sack,
306 .maxlen = sizeof(int),
307 .mode = 0644,
308 .proc_handler = proc_dointvec
309 },
310 {
311 .procname = "tcp_retrans_collapse",
312 .data = &sysctl_tcp_retrans_collapse,
313 .maxlen = sizeof(int),
314 .mode = 0644,
315 .proc_handler = proc_dointvec
316 },
317 {
318 .procname = "ip_default_ttl",
319 .data = &sysctl_ip_default_ttl,
320 .maxlen = sizeof(int),
321 .mode = 0644,
322 .proc_handler = proc_dointvec_minmax,
323 .extra1 = &ip_ttl_min,
324 .extra2 = &ip_ttl_max,
325 },
326 {
327 .procname = "ip_no_pmtu_disc",
328 .data = &ipv4_config.no_pmtu_disc,
329 .maxlen = sizeof(int),
330 .mode = 0644,
331 .proc_handler = proc_dointvec
332 },
333 {
334 .procname = "ip_nonlocal_bind",
335 .data = &sysctl_ip_nonlocal_bind,
336 .maxlen = sizeof(int),
337 .mode = 0644,
338 .proc_handler = proc_dointvec
339 },
340 {
341 .procname = "tcp_syn_retries",
342 .data = &sysctl_tcp_syn_retries,
343 .maxlen = sizeof(int),
344 .mode = 0644,
345 .proc_handler = proc_dointvec_minmax,
346 .extra1 = &tcp_syn_retries_min,
347 .extra2 = &tcp_syn_retries_max
348 },
349 {
350 .procname = "tcp_synack_retries",
351 .data = &sysctl_tcp_synack_retries,
352 .maxlen = sizeof(int),
353 .mode = 0644,
354 .proc_handler = proc_dointvec
355 },
356 {
357 .procname = "tcp_max_orphans",
358 .data = &sysctl_tcp_max_orphans,
359 .maxlen = sizeof(int),
360 .mode = 0644,
361 .proc_handler = proc_dointvec
362 },
363 {
364 .procname = "tcp_max_tw_buckets",
365 .data = &tcp_death_row.sysctl_max_tw_buckets,
366 .maxlen = sizeof(int),
367 .mode = 0644,
368 .proc_handler = proc_dointvec
369 },
370 {
371 .procname = "ip_early_demux",
372 .data = &sysctl_ip_early_demux,
373 .maxlen = sizeof(int),
374 .mode = 0644,
375 .proc_handler = proc_dointvec
376 },
377 {
378 .procname = "ip_dynaddr",
379 .data = &sysctl_ip_dynaddr,
380 .maxlen = sizeof(int),
381 .mode = 0644,
382 .proc_handler = proc_dointvec
383 },
384 {
385 .procname = "tcp_keepalive_time",
386 .data = &sysctl_tcp_keepalive_time,
387 .maxlen = sizeof(int),
388 .mode = 0644,
389 .proc_handler = proc_dointvec_jiffies,
390 },
391 {
392 .procname = "tcp_keepalive_probes",
393 .data = &sysctl_tcp_keepalive_probes,
394 .maxlen = sizeof(int),
395 .mode = 0644,
396 .proc_handler = proc_dointvec
397 },
398 {
399 .procname = "tcp_keepalive_intvl",
400 .data = &sysctl_tcp_keepalive_intvl,
401 .maxlen = sizeof(int),
402 .mode = 0644,
403 .proc_handler = proc_dointvec_jiffies,
404 },
405 {
406 .procname = "tcp_retries1",
407 .data = &sysctl_tcp_retries1,
408 .maxlen = sizeof(int),
409 .mode = 0644,
410 .proc_handler = proc_dointvec_minmax,
411 .extra2 = &tcp_retr1_max
412 },
413 {
414 .procname = "tcp_retries2",
415 .data = &sysctl_tcp_retries2,
416 .maxlen = sizeof(int),
417 .mode = 0644,
418 .proc_handler = proc_dointvec
419 },
420 {
421 .procname = "tcp_fin_timeout",
422 .data = &sysctl_tcp_fin_timeout,
423 .maxlen = sizeof(int),
424 .mode = 0644,
425 .proc_handler = proc_dointvec_jiffies,
426 },
427 #ifdef CONFIG_SYN_COOKIES
428 {
429 .procname = "tcp_syncookies",
430 .data = &sysctl_tcp_syncookies,
431 .maxlen = sizeof(int),
432 .mode = 0644,
433 .proc_handler = proc_dointvec
434 },
435 #endif
436 {
437 .procname = "tcp_fastopen",
438 .data = &sysctl_tcp_fastopen,
439 .maxlen = sizeof(int),
440 .mode = 0644,
441 .proc_handler = proc_dointvec,
442 },
443 {
444 .procname = "tcp_fastopen_key",
445 .mode = 0600,
446 .maxlen = ((TCP_FASTOPEN_KEY_LENGTH * 2) + 10),
447 .proc_handler = proc_tcp_fastopen_key,
448 },
449 {
450 .procname = "tcp_tw_recycle",
451 .data = &tcp_death_row.sysctl_tw_recycle,
452 .maxlen = sizeof(int),
453 .mode = 0644,
454 .proc_handler = proc_dointvec
455 },
456 {
457 .procname = "tcp_abort_on_overflow",
458 .data = &sysctl_tcp_abort_on_overflow,
459 .maxlen = sizeof(int),
460 .mode = 0644,
461 .proc_handler = proc_dointvec
462 },
463 {
464 .procname = "tcp_stdurg",
465 .data = &sysctl_tcp_stdurg,
466 .maxlen = sizeof(int),
467 .mode = 0644,
468 .proc_handler = proc_dointvec
469 },
470 {
471 .procname = "tcp_rfc1337",
472 .data = &sysctl_tcp_rfc1337,
473 .maxlen = sizeof(int),
474 .mode = 0644,
475 .proc_handler = proc_dointvec
476 },
477 {
478 .procname = "tcp_max_syn_backlog",
479 .data = &sysctl_max_syn_backlog,
480 .maxlen = sizeof(int),
481 .mode = 0644,
482 .proc_handler = proc_dointvec
483 },
484 {
485 .procname = "ip_local_reserved_ports",
486 .data = NULL, /* initialized in sysctl_ipv4_init */
487 .maxlen = 65536,
488 .mode = 0644,
489 .proc_handler = proc_do_large_bitmap,
490 },
491 {
492 .procname = "igmp_max_memberships",
493 .data = &sysctl_igmp_max_memberships,
494 .maxlen = sizeof(int),
495 .mode = 0644,
496 .proc_handler = proc_dointvec
497 },
498 {
499 .procname = "igmp_max_msf",
500 .data = &sysctl_igmp_max_msf,
501 .maxlen = sizeof(int),
502 .mode = 0644,
503 .proc_handler = proc_dointvec
504 },
505 {
506 .procname = "inet_peer_threshold",
507 .data = &inet_peer_threshold,
508 .maxlen = sizeof(int),
509 .mode = 0644,
510 .proc_handler = proc_dointvec
511 },
512 {
513 .procname = "inet_peer_minttl",
514 .data = &inet_peer_minttl,
515 .maxlen = sizeof(int),
516 .mode = 0644,
517 .proc_handler = proc_dointvec_jiffies,
518 },
519 {
520 .procname = "inet_peer_maxttl",
521 .data = &inet_peer_maxttl,
522 .maxlen = sizeof(int),
523 .mode = 0644,
524 .proc_handler = proc_dointvec_jiffies,
525 },
526 {
527 .procname = "tcp_orphan_retries",
528 .data = &sysctl_tcp_orphan_retries,
529 .maxlen = sizeof(int),
530 .mode = 0644,
531 .proc_handler = proc_dointvec
532 },
533 {
534 .procname = "tcp_fack",
535 .data = &sysctl_tcp_fack,
536 .maxlen = sizeof(int),
537 .mode = 0644,
538 .proc_handler = proc_dointvec
539 },
540 {
541 .procname = "tcp_reordering",
542 .data = &sysctl_tcp_reordering,
543 .maxlen = sizeof(int),
544 .mode = 0644,
545 .proc_handler = proc_dointvec
546 },
547 {
548 .procname = "tcp_dsack",
549 .data = &sysctl_tcp_dsack,
550 .maxlen = sizeof(int),
551 .mode = 0644,
552 .proc_handler = proc_dointvec
553 },
554 {
555 .procname = "tcp_wmem",
556 .data = &sysctl_tcp_wmem,
557 .maxlen = sizeof(sysctl_tcp_wmem),
558 .mode = 0644,
559 .proc_handler = proc_dointvec_minmax,
560 .extra1 = &one,
561 },
562 {
563 .procname = "tcp_notsent_lowat",
564 .data = &sysctl_tcp_notsent_lowat,
565 .maxlen = sizeof(sysctl_tcp_notsent_lowat),
566 .mode = 0644,
567 .proc_handler = proc_dointvec,
568 },
569 {
570 .procname = "tcp_rmem",
571 .data = &sysctl_tcp_rmem,
572 .maxlen = sizeof(sysctl_tcp_rmem),
573 .mode = 0644,
574 .proc_handler = proc_dointvec_minmax,
575 .extra1 = &one,
576 },
577 {
578 .procname = "tcp_app_win",
579 .data = &sysctl_tcp_app_win,
580 .maxlen = sizeof(int),
581 .mode = 0644,
582 .proc_handler = proc_dointvec
583 },
584 {
585 .procname = "tcp_adv_win_scale",
586 .data = &sysctl_tcp_adv_win_scale,
587 .maxlen = sizeof(int),
588 .mode = 0644,
589 .proc_handler = proc_dointvec_minmax,
590 .extra1 = &tcp_adv_win_scale_min,
591 .extra2 = &tcp_adv_win_scale_max,
592 },
593 {
594 .procname = "tcp_tw_reuse",
595 .data = &sysctl_tcp_tw_reuse,
596 .maxlen = sizeof(int),
597 .mode = 0644,
598 .proc_handler = proc_dointvec
599 },
600 {
601 .procname = "tcp_frto",
602 .data = &sysctl_tcp_frto,
603 .maxlen = sizeof(int),
604 .mode = 0644,
605 .proc_handler = proc_dointvec
606 },
607 {
608 .procname = "tcp_low_latency",
609 .data = &sysctl_tcp_low_latency,
610 .maxlen = sizeof(int),
611 .mode = 0644,
612 .proc_handler = proc_dointvec
613 },
614 {
615 .procname = "tcp_no_metrics_save",
616 .data = &sysctl_tcp_nometrics_save,
617 .maxlen = sizeof(int),
618 .mode = 0644,
619 .proc_handler = proc_dointvec,
620 },
621 {
622 .procname = "tcp_moderate_rcvbuf",
623 .data = &sysctl_tcp_moderate_rcvbuf,
624 .maxlen = sizeof(int),
625 .mode = 0644,
626 .proc_handler = proc_dointvec,
627 },
628 {
629 .procname = "tcp_tso_win_divisor",
630 .data = &sysctl_tcp_tso_win_divisor,
631 .maxlen = sizeof(int),
632 .mode = 0644,
633 .proc_handler = proc_dointvec,
634 },
635 {
636 .procname = "tcp_congestion_control",
637 .mode = 0644,
638 .maxlen = TCP_CA_NAME_MAX,
639 .proc_handler = proc_tcp_congestion_control,
640 },
641 {
642 .procname = "tcp_mtu_probing",
643 .data = &sysctl_tcp_mtu_probing,
644 .maxlen = sizeof(int),
645 .mode = 0644,
646 .proc_handler = proc_dointvec,
647 },
648 {
649 .procname = "tcp_base_mss",
650 .data = &sysctl_tcp_base_mss,
651 .maxlen = sizeof(int),
652 .mode = 0644,
653 .proc_handler = proc_dointvec,
654 },
655 {
656 .procname = "tcp_workaround_signed_windows",
657 .data = &sysctl_tcp_workaround_signed_windows,
658 .maxlen = sizeof(int),
659 .mode = 0644,
660 .proc_handler = proc_dointvec
661 },
662 {
663 .procname = "tcp_limit_output_bytes",
664 .data = &sysctl_tcp_limit_output_bytes,
665 .maxlen = sizeof(int),
666 .mode = 0644,
667 .proc_handler = proc_dointvec
668 },
669 {
670 .procname = "tcp_challenge_ack_limit",
671 .data = &sysctl_tcp_challenge_ack_limit,
672 .maxlen = sizeof(int),
673 .mode = 0644,
674 .proc_handler = proc_dointvec
675 },
676 #ifdef CONFIG_NET_DMA
677 {
678 .procname = "tcp_dma_copybreak",
679 .data = &sysctl_tcp_dma_copybreak,
680 .maxlen = sizeof(int),
681 .mode = 0644,
682 .proc_handler = proc_dointvec
683 },
684 #endif
685 {
686 .procname = "tcp_slow_start_after_idle",
687 .data = &sysctl_tcp_slow_start_after_idle,
688 .maxlen = sizeof(int),
689 .mode = 0644,
690 .proc_handler = proc_dointvec
691 },
692 #ifdef CONFIG_NETLABEL
693 {
694 .procname = "cipso_cache_enable",
695 .data = &cipso_v4_cache_enabled,
696 .maxlen = sizeof(int),
697 .mode = 0644,
698 .proc_handler = proc_dointvec,
699 },
700 {
701 .procname = "cipso_cache_bucket_size",
702 .data = &cipso_v4_cache_bucketsize,
703 .maxlen = sizeof(int),
704 .mode = 0644,
705 .proc_handler = proc_dointvec,
706 },
707 {
708 .procname = "cipso_rbm_optfmt",
709 .data = &cipso_v4_rbm_optfmt,
710 .maxlen = sizeof(int),
711 .mode = 0644,
712 .proc_handler = proc_dointvec,
713 },
714 {
715 .procname = "cipso_rbm_strictvalid",
716 .data = &cipso_v4_rbm_strictvalid,
717 .maxlen = sizeof(int),
718 .mode = 0644,
719 .proc_handler = proc_dointvec,
720 },
721 #endif /* CONFIG_NETLABEL */
722 {
723 .procname = "tcp_available_congestion_control",
724 .maxlen = TCP_CA_BUF_MAX,
725 .mode = 0444,
726 .proc_handler = proc_tcp_available_congestion_control,
727 },
728 {
729 .procname = "tcp_allowed_congestion_control",
730 .maxlen = TCP_CA_BUF_MAX,
731 .mode = 0644,
732 .proc_handler = proc_allowed_congestion_control,
733 },
734 {
735 .procname = "tcp_max_ssthresh",
736 .data = &sysctl_tcp_max_ssthresh,
737 .maxlen = sizeof(int),
738 .mode = 0644,
739 .proc_handler = proc_dointvec,
740 },
741 {
742 .procname = "tcp_thin_linear_timeouts",
743 .data = &sysctl_tcp_thin_linear_timeouts,
744 .maxlen = sizeof(int),
745 .mode = 0644,
746 .proc_handler = proc_dointvec
747 },
748 {
749 .procname = "tcp_thin_dupack",
750 .data = &sysctl_tcp_thin_dupack,
751 .maxlen = sizeof(int),
752 .mode = 0644,
753 .proc_handler = proc_dointvec
754 },
755 {
756 .procname = "tcp_early_retrans",
757 .data = &sysctl_tcp_early_retrans,
758 .maxlen = sizeof(int),
759 .mode = 0644,
760 .proc_handler = proc_dointvec_minmax,
761 .extra1 = &zero,
762 .extra2 = &four,
763 },
764 {
765 .procname = "tcp_min_tso_segs",
766 .data = &sysctl_tcp_min_tso_segs,
767 .maxlen = sizeof(int),
768 .mode = 0644,
769 .proc_handler = proc_dointvec_minmax,
770 .extra1 = &zero,
771 .extra2 = &gso_max_segs,
772 },
773 {
774 .procname = "udp_mem",
775 .data = &sysctl_udp_mem,
776 .maxlen = sizeof(sysctl_udp_mem),
777 .mode = 0644,
778 .proc_handler = proc_doulongvec_minmax,
779 },
780 {
781 .procname = "udp_rmem_min",
782 .data = &sysctl_udp_rmem_min,
783 .maxlen = sizeof(sysctl_udp_rmem_min),
784 .mode = 0644,
785 .proc_handler = proc_dointvec_minmax,
786 .extra1 = &one
787 },
788 {
789 .procname = "udp_wmem_min",
790 .data = &sysctl_udp_wmem_min,
791 .maxlen = sizeof(sysctl_udp_wmem_min),
792 .mode = 0644,
793 .proc_handler = proc_dointvec_minmax,
794 .extra1 = &one
795 },
796 { }
797 };
798
799 static struct ctl_table ipv4_net_table[] = {
800 {
801 .procname = "icmp_echo_ignore_all",
802 .data = &init_net.ipv4.sysctl_icmp_echo_ignore_all,
803 .maxlen = sizeof(int),
804 .mode = 0644,
805 .proc_handler = proc_dointvec
806 },
807 {
808 .procname = "icmp_echo_ignore_broadcasts",
809 .data = &init_net.ipv4.sysctl_icmp_echo_ignore_broadcasts,
810 .maxlen = sizeof(int),
811 .mode = 0644,
812 .proc_handler = proc_dointvec
813 },
814 {
815 .procname = "icmp_ignore_bogus_error_responses",
816 .data = &init_net.ipv4.sysctl_icmp_ignore_bogus_error_responses,
817 .maxlen = sizeof(int),
818 .mode = 0644,
819 .proc_handler = proc_dointvec
820 },
821 {
822 .procname = "icmp_errors_use_inbound_ifaddr",
823 .data = &init_net.ipv4.sysctl_icmp_errors_use_inbound_ifaddr,
824 .maxlen = sizeof(int),
825 .mode = 0644,
826 .proc_handler = proc_dointvec
827 },
828 {
829 .procname = "icmp_ratelimit",
830 .data = &init_net.ipv4.sysctl_icmp_ratelimit,
831 .maxlen = sizeof(int),
832 .mode = 0644,
833 .proc_handler = proc_dointvec_ms_jiffies,
834 },
835 {
836 .procname = "icmp_ratemask",
837 .data = &init_net.ipv4.sysctl_icmp_ratemask,
838 .maxlen = sizeof(int),
839 .mode = 0644,
840 .proc_handler = proc_dointvec
841 },
842 {
843 .procname = "ping_group_range",
844 .data = &init_net.ipv4.sysctl_ping_group_range,
845 .maxlen = sizeof(gid_t)*2,
846 .mode = 0644,
847 .proc_handler = ipv4_ping_group_range,
848 },
849 {
850 .procname = "tcp_ecn",
851 .data = &init_net.ipv4.sysctl_tcp_ecn,
852 .maxlen = sizeof(int),
853 .mode = 0644,
854 .proc_handler = proc_dointvec
855 },
856 {
857 .procname = "ip_local_port_range",
858 .maxlen = sizeof(init_net.ipv4.sysctl_local_ports.range),
859 .data = &init_net.ipv4.sysctl_local_ports.range,
860 .mode = 0644,
861 .proc_handler = ipv4_local_port_range,
862 },
863 {
864 .procname = "tcp_mem",
865 .maxlen = sizeof(init_net.ipv4.sysctl_tcp_mem),
866 .mode = 0644,
867 .proc_handler = ipv4_tcp_mem,
868 },
869 { }
870 };
871
872 static __net_init int ipv4_sysctl_init_net(struct net *net)
873 {
874 struct ctl_table *table;
875
876 table = ipv4_net_table;
877 if (!net_eq(net, &init_net)) {
878 table = kmemdup(table, sizeof(ipv4_net_table), GFP_KERNEL);
879 if (table == NULL)
880 goto err_alloc;
881
882 table[0].data =
883 &net->ipv4.sysctl_icmp_echo_ignore_all;
884 table[1].data =
885 &net->ipv4.sysctl_icmp_echo_ignore_broadcasts;
886 table[2].data =
887 &net->ipv4.sysctl_icmp_ignore_bogus_error_responses;
888 table[3].data =
889 &net->ipv4.sysctl_icmp_errors_use_inbound_ifaddr;
890 table[4].data =
891 &net->ipv4.sysctl_icmp_ratelimit;
892 table[5].data =
893 &net->ipv4.sysctl_icmp_ratemask;
894 table[6].data =
895 &net->ipv4.sysctl_ping_group_range;
896 table[7].data =
897 &net->ipv4.sysctl_tcp_ecn;
898 table[8].data =
899 &net->ipv4.sysctl_local_ports.range;
900
901 /* Don't export sysctls to unprivileged users */
902 if (net->user_ns != &init_user_ns)
903 table[0].procname = NULL;
904 }
905
906 /*
907 * Sane defaults - nobody may create ping sockets.
908 * Boot scripts should set this to distro-specific group.
909 */
910 net->ipv4.sysctl_ping_group_range[0] = make_kgid(&init_user_ns, 1);
911 net->ipv4.sysctl_ping_group_range[1] = make_kgid(&init_user_ns, 0);
912
913 /*
914 * Set defaults for local port range
915 */
916 seqlock_init(&net->ipv4.sysctl_local_ports.lock);
917 net->ipv4.sysctl_local_ports.range[0] = 32768;
918 net->ipv4.sysctl_local_ports.range[1] = 61000;
919
920 tcp_init_mem(net);
921
922 net->ipv4.ipv4_hdr = register_net_sysctl(net, "net/ipv4", table);
923 if (net->ipv4.ipv4_hdr == NULL)
924 goto err_reg;
925
926 return 0;
927
928 err_reg:
929 if (!net_eq(net, &init_net))
930 kfree(table);
931 err_alloc:
932 return -ENOMEM;
933 }
934
935 static __net_exit void ipv4_sysctl_exit_net(struct net *net)
936 {
937 struct ctl_table *table;
938
939 table = net->ipv4.ipv4_hdr->ctl_table_arg;
940 unregister_net_sysctl_table(net->ipv4.ipv4_hdr);
941 kfree(table);
942 }
943
944 static __net_initdata struct pernet_operations ipv4_sysctl_ops = {
945 .init = ipv4_sysctl_init_net,
946 .exit = ipv4_sysctl_exit_net,
947 };
948
949 static __init int sysctl_ipv4_init(void)
950 {
951 struct ctl_table_header *hdr;
952 struct ctl_table *i;
953
954 for (i = ipv4_table; i->procname; i++) {
955 if (strcmp(i->procname, "ip_local_reserved_ports") == 0) {
956 i->data = sysctl_local_reserved_ports;
957 break;
958 }
959 }
960 if (!i->procname)
961 return -EINVAL;
962
963 hdr = register_net_sysctl(&init_net, "net/ipv4", ipv4_table);
964 if (hdr == NULL)
965 return -ENOMEM;
966
967 if (register_pernet_subsys(&ipv4_sysctl_ops)) {
968 unregister_net_sysctl_table(hdr);
969 return -ENOMEM;
970 }
971
972 return 0;
973 }
974
975 __initcall(sysctl_ipv4_init);
Linux kernel - Deliverables
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