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tcp: TCP_NOTSENT_LOWAT socket option
[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 tcp_retr1_max = 255;
33 static int ip_local_port_range_min[] = { 1, 1 };
34 static int ip_local_port_range_max[] = { 65535, 65535 };
35 static int tcp_adv_win_scale_min = -31;
36 static int tcp_adv_win_scale_max = 31;
37 static int ip_ttl_min = 1;
38 static int ip_ttl_max = 255;
39 static int ip_ping_group_range_min[] = { 0, 0 };
40 static int ip_ping_group_range_max[] = { GID_T_MAX, GID_T_MAX };
41
42 /* Update system visible IP port range */
43 static void set_local_port_range(int range[2])
44 {
45 write_seqlock(&sysctl_local_ports.lock);
46 sysctl_local_ports.range[0] = range[0];
47 sysctl_local_ports.range[1] = range[1];
48 write_sequnlock(&sysctl_local_ports.lock);
49 }
50
51 /* Validate changes from /proc interface. */
52 static int ipv4_local_port_range(struct ctl_table *table, int write,
53 void __user *buffer,
54 size_t *lenp, loff_t *ppos)
55 {
56 int ret;
57 int range[2];
58 struct ctl_table tmp = {
59 .data = &range,
60 .maxlen = sizeof(range),
61 .mode = table->mode,
62 .extra1 = &ip_local_port_range_min,
63 .extra2 = &ip_local_port_range_max,
64 };
65
66 inet_get_local_port_range(range, range + 1);
67 ret = proc_dointvec_minmax(&tmp, write, buffer, lenp, ppos);
68
69 if (write && ret == 0) {
70 if (range[1] < range[0])
71 ret = -EINVAL;
72 else
73 set_local_port_range(range);
74 }
75
76 return ret;
77 }
78
79
80 static void inet_get_ping_group_range_table(struct ctl_table *table, kgid_t *low, kgid_t *high)
81 {
82 kgid_t *data = table->data;
83 unsigned int seq;
84 do {
85 seq = read_seqbegin(&sysctl_local_ports.lock);
86
87 *low = data[0];
88 *high = data[1];
89 } while (read_seqretry(&sysctl_local_ports.lock, seq));
90 }
91
92 /* Update system visible IP port range */
93 static void set_ping_group_range(struct ctl_table *table, kgid_t low, kgid_t high)
94 {
95 kgid_t *data = table->data;
96 write_seqlock(&sysctl_local_ports.lock);
97 data[0] = low;
98 data[1] = high;
99 write_sequnlock(&sysctl_local_ports.lock);
100 }
101
102 /* Validate changes from /proc interface. */
103 static int ipv4_ping_group_range(struct ctl_table *table, int write,
104 void __user *buffer,
105 size_t *lenp, loff_t *ppos)
106 {
107 struct user_namespace *user_ns = current_user_ns();
108 int ret;
109 gid_t urange[2];
110 kgid_t low, high;
111 struct ctl_table tmp = {
112 .data = &urange,
113 .maxlen = sizeof(urange),
114 .mode = table->mode,
115 .extra1 = &ip_ping_group_range_min,
116 .extra2 = &ip_ping_group_range_max,
117 };
118
119 inet_get_ping_group_range_table(table, &low, &high);
120 urange[0] = from_kgid_munged(user_ns, low);
121 urange[1] = from_kgid_munged(user_ns, high);
122 ret = proc_dointvec_minmax(&tmp, write, buffer, lenp, ppos);
123
124 if (write && ret == 0) {
125 low = make_kgid(user_ns, urange[0]);
126 high = make_kgid(user_ns, urange[1]);
127 if (!gid_valid(low) || !gid_valid(high) ||
128 (urange[1] < urange[0]) || gid_lt(high, low)) {
129 low = make_kgid(&init_user_ns, 1);
130 high = make_kgid(&init_user_ns, 0);
131 }
132 set_ping_group_range(table, low, high);
133 }
134
135 return ret;
136 }
137
138 static int proc_tcp_congestion_control(struct ctl_table *ctl, int write,
139 void __user *buffer, size_t *lenp, loff_t *ppos)
140 {
141 char val[TCP_CA_NAME_MAX];
142 struct ctl_table tbl = {
143 .data = val,
144 .maxlen = TCP_CA_NAME_MAX,
145 };
146 int ret;
147
148 tcp_get_default_congestion_control(val);
149
150 ret = proc_dostring(&tbl, write, buffer, lenp, ppos);
151 if (write && ret == 0)
152 ret = tcp_set_default_congestion_control(val);
153 return ret;
154 }
155
156 static int proc_tcp_available_congestion_control(struct ctl_table *ctl,
157 int write,
158 void __user *buffer, size_t *lenp,
159 loff_t *ppos)
160 {
161 struct ctl_table tbl = { .maxlen = TCP_CA_BUF_MAX, };
162 int ret;
163
164 tbl.data = kmalloc(tbl.maxlen, GFP_USER);
165 if (!tbl.data)
166 return -ENOMEM;
167 tcp_get_available_congestion_control(tbl.data, TCP_CA_BUF_MAX);
168 ret = proc_dostring(&tbl, write, buffer, lenp, ppos);
169 kfree(tbl.data);
170 return ret;
171 }
172
173 static int proc_allowed_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
185 tcp_get_allowed_congestion_control(tbl.data, tbl.maxlen);
186 ret = proc_dostring(&tbl, write, buffer, lenp, ppos);
187 if (write && ret == 0)
188 ret = tcp_set_allowed_congestion_control(tbl.data);
189 kfree(tbl.data);
190 return ret;
191 }
192
193 static int ipv4_tcp_mem(struct ctl_table *ctl, int write,
194 void __user *buffer, size_t *lenp,
195 loff_t *ppos)
196 {
197 int ret;
198 unsigned long vec[3];
199 struct net *net = current->nsproxy->net_ns;
200 #ifdef CONFIG_MEMCG_KMEM
201 struct mem_cgroup *memcg;
202 #endif
203
204 struct ctl_table tmp = {
205 .data = &vec,
206 .maxlen = sizeof(vec),
207 .mode = ctl->mode,
208 };
209
210 if (!write) {
211 ctl->data = &net->ipv4.sysctl_tcp_mem;
212 return proc_doulongvec_minmax(ctl, write, buffer, lenp, ppos);
213 }
214
215 ret = proc_doulongvec_minmax(&tmp, write, buffer, lenp, ppos);
216 if (ret)
217 return ret;
218
219 #ifdef CONFIG_MEMCG_KMEM
220 rcu_read_lock();
221 memcg = mem_cgroup_from_task(current);
222
223 tcp_prot_mem(memcg, vec[0], 0);
224 tcp_prot_mem(memcg, vec[1], 1);
225 tcp_prot_mem(memcg, vec[2], 2);
226 rcu_read_unlock();
227 #endif
228
229 net->ipv4.sysctl_tcp_mem[0] = vec[0];
230 net->ipv4.sysctl_tcp_mem[1] = vec[1];
231 net->ipv4.sysctl_tcp_mem[2] = vec[2];
232
233 return 0;
234 }
235
236 static int proc_tcp_fastopen_key(struct ctl_table *ctl, int write,
237 void __user *buffer, size_t *lenp,
238 loff_t *ppos)
239 {
240 struct ctl_table tbl = { .maxlen = (TCP_FASTOPEN_KEY_LENGTH * 2 + 10) };
241 struct tcp_fastopen_context *ctxt;
242 int ret;
243 u32 user_key[4]; /* 16 bytes, matching TCP_FASTOPEN_KEY_LENGTH */
244
245 tbl.data = kmalloc(tbl.maxlen, GFP_KERNEL);
246 if (!tbl.data)
247 return -ENOMEM;
248
249 rcu_read_lock();
250 ctxt = rcu_dereference(tcp_fastopen_ctx);
251 if (ctxt)
252 memcpy(user_key, ctxt->key, TCP_FASTOPEN_KEY_LENGTH);
253 else
254 memset(user_key, 0, sizeof(user_key));
255 rcu_read_unlock();
256
257 snprintf(tbl.data, tbl.maxlen, "%08x-%08x-%08x-%08x",
258 user_key[0], user_key[1], user_key[2], user_key[3]);
259 ret = proc_dostring(&tbl, write, buffer, lenp, ppos);
260
261 if (write && ret == 0) {
262 if (sscanf(tbl.data, "%x-%x-%x-%x", user_key, user_key + 1,
263 user_key + 2, user_key + 3) != 4) {
264 ret = -EINVAL;
265 goto bad_key;
266 }
267 tcp_fastopen_reset_cipher(user_key, TCP_FASTOPEN_KEY_LENGTH);
268 }
269
270 bad_key:
271 pr_debug("proc FO key set 0x%x-%x-%x-%x <- 0x%s: %u\n",
272 user_key[0], user_key[1], user_key[2], user_key[3],
273 (char *)tbl.data, ret);
274 kfree(tbl.data);
275 return ret;
276 }
277
278 static struct ctl_table ipv4_table[] = {
279 {
280 .procname = "tcp_timestamps",
281 .data = &sysctl_tcp_timestamps,
282 .maxlen = sizeof(int),
283 .mode = 0644,
284 .proc_handler = proc_dointvec
285 },
286 {
287 .procname = "tcp_window_scaling",
288 .data = &sysctl_tcp_window_scaling,
289 .maxlen = sizeof(int),
290 .mode = 0644,
291 .proc_handler = proc_dointvec
292 },
293 {
294 .procname = "tcp_sack",
295 .data = &sysctl_tcp_sack,
296 .maxlen = sizeof(int),
297 .mode = 0644,
298 .proc_handler = proc_dointvec
299 },
300 {
301 .procname = "tcp_retrans_collapse",
302 .data = &sysctl_tcp_retrans_collapse,
303 .maxlen = sizeof(int),
304 .mode = 0644,
305 .proc_handler = proc_dointvec
306 },
307 {
308 .procname = "ip_default_ttl",
309 .data = &sysctl_ip_default_ttl,
310 .maxlen = sizeof(int),
311 .mode = 0644,
312 .proc_handler = proc_dointvec_minmax,
313 .extra1 = &ip_ttl_min,
314 .extra2 = &ip_ttl_max,
315 },
316 {
317 .procname = "ip_no_pmtu_disc",
318 .data = &ipv4_config.no_pmtu_disc,
319 .maxlen = sizeof(int),
320 .mode = 0644,
321 .proc_handler = proc_dointvec
322 },
323 {
324 .procname = "ip_nonlocal_bind",
325 .data = &sysctl_ip_nonlocal_bind,
326 .maxlen = sizeof(int),
327 .mode = 0644,
328 .proc_handler = proc_dointvec
329 },
330 {
331 .procname = "tcp_syn_retries",
332 .data = &sysctl_tcp_syn_retries,
333 .maxlen = sizeof(int),
334 .mode = 0644,
335 .proc_handler = proc_dointvec
336 },
337 {
338 .procname = "tcp_synack_retries",
339 .data = &sysctl_tcp_synack_retries,
340 .maxlen = sizeof(int),
341 .mode = 0644,
342 .proc_handler = proc_dointvec
343 },
344 {
345 .procname = "tcp_max_orphans",
346 .data = &sysctl_tcp_max_orphans,
347 .maxlen = sizeof(int),
348 .mode = 0644,
349 .proc_handler = proc_dointvec
350 },
351 {
352 .procname = "tcp_max_tw_buckets",
353 .data = &tcp_death_row.sysctl_max_tw_buckets,
354 .maxlen = sizeof(int),
355 .mode = 0644,
356 .proc_handler = proc_dointvec
357 },
358 {
359 .procname = "ip_early_demux",
360 .data = &sysctl_ip_early_demux,
361 .maxlen = sizeof(int),
362 .mode = 0644,
363 .proc_handler = proc_dointvec
364 },
365 {
366 .procname = "ip_dynaddr",
367 .data = &sysctl_ip_dynaddr,
368 .maxlen = sizeof(int),
369 .mode = 0644,
370 .proc_handler = proc_dointvec
371 },
372 {
373 .procname = "tcp_keepalive_time",
374 .data = &sysctl_tcp_keepalive_time,
375 .maxlen = sizeof(int),
376 .mode = 0644,
377 .proc_handler = proc_dointvec_jiffies,
378 },
379 {
380 .procname = "tcp_keepalive_probes",
381 .data = &sysctl_tcp_keepalive_probes,
382 .maxlen = sizeof(int),
383 .mode = 0644,
384 .proc_handler = proc_dointvec
385 },
386 {
387 .procname = "tcp_keepalive_intvl",
388 .data = &sysctl_tcp_keepalive_intvl,
389 .maxlen = sizeof(int),
390 .mode = 0644,
391 .proc_handler = proc_dointvec_jiffies,
392 },
393 {
394 .procname = "tcp_retries1",
395 .data = &sysctl_tcp_retries1,
396 .maxlen = sizeof(int),
397 .mode = 0644,
398 .proc_handler = proc_dointvec_minmax,
399 .extra2 = &tcp_retr1_max
400 },
401 {
402 .procname = "tcp_retries2",
403 .data = &sysctl_tcp_retries2,
404 .maxlen = sizeof(int),
405 .mode = 0644,
406 .proc_handler = proc_dointvec
407 },
408 {
409 .procname = "tcp_fin_timeout",
410 .data = &sysctl_tcp_fin_timeout,
411 .maxlen = sizeof(int),
412 .mode = 0644,
413 .proc_handler = proc_dointvec_jiffies,
414 },
415 #ifdef CONFIG_SYN_COOKIES
416 {
417 .procname = "tcp_syncookies",
418 .data = &sysctl_tcp_syncookies,
419 .maxlen = sizeof(int),
420 .mode = 0644,
421 .proc_handler = proc_dointvec
422 },
423 #endif
424 {
425 .procname = "tcp_fastopen",
426 .data = &sysctl_tcp_fastopen,
427 .maxlen = sizeof(int),
428 .mode = 0644,
429 .proc_handler = proc_dointvec,
430 },
431 {
432 .procname = "tcp_fastopen_key",
433 .mode = 0600,
434 .maxlen = ((TCP_FASTOPEN_KEY_LENGTH * 2) + 10),
435 .proc_handler = proc_tcp_fastopen_key,
436 },
437 {
438 .procname = "tcp_tw_recycle",
439 .data = &tcp_death_row.sysctl_tw_recycle,
440 .maxlen = sizeof(int),
441 .mode = 0644,
442 .proc_handler = proc_dointvec
443 },
444 {
445 .procname = "tcp_abort_on_overflow",
446 .data = &sysctl_tcp_abort_on_overflow,
447 .maxlen = sizeof(int),
448 .mode = 0644,
449 .proc_handler = proc_dointvec
450 },
451 {
452 .procname = "tcp_stdurg",
453 .data = &sysctl_tcp_stdurg,
454 .maxlen = sizeof(int),
455 .mode = 0644,
456 .proc_handler = proc_dointvec
457 },
458 {
459 .procname = "tcp_rfc1337",
460 .data = &sysctl_tcp_rfc1337,
461 .maxlen = sizeof(int),
462 .mode = 0644,
463 .proc_handler = proc_dointvec
464 },
465 {
466 .procname = "tcp_max_syn_backlog",
467 .data = &sysctl_max_syn_backlog,
468 .maxlen = sizeof(int),
469 .mode = 0644,
470 .proc_handler = proc_dointvec
471 },
472 {
473 .procname = "ip_local_port_range",
474 .data = &sysctl_local_ports.range,
475 .maxlen = sizeof(sysctl_local_ports.range),
476 .mode = 0644,
477 .proc_handler = ipv4_local_port_range,
478 },
479 {
480 .procname = "ip_local_reserved_ports",
481 .data = NULL, /* initialized in sysctl_ipv4_init */
482 .maxlen = 65536,
483 .mode = 0644,
484 .proc_handler = proc_do_large_bitmap,
485 },
486 {
487 .procname = "igmp_max_memberships",
488 .data = &sysctl_igmp_max_memberships,
489 .maxlen = sizeof(int),
490 .mode = 0644,
491 .proc_handler = proc_dointvec
492 },
493 {
494 .procname = "igmp_max_msf",
495 .data = &sysctl_igmp_max_msf,
496 .maxlen = sizeof(int),
497 .mode = 0644,
498 .proc_handler = proc_dointvec
499 },
500 {
501 .procname = "inet_peer_threshold",
502 .data = &inet_peer_threshold,
503 .maxlen = sizeof(int),
504 .mode = 0644,
505 .proc_handler = proc_dointvec
506 },
507 {
508 .procname = "inet_peer_minttl",
509 .data = &inet_peer_minttl,
510 .maxlen = sizeof(int),
511 .mode = 0644,
512 .proc_handler = proc_dointvec_jiffies,
513 },
514 {
515 .procname = "inet_peer_maxttl",
516 .data = &inet_peer_maxttl,
517 .maxlen = sizeof(int),
518 .mode = 0644,
519 .proc_handler = proc_dointvec_jiffies,
520 },
521 {
522 .procname = "tcp_orphan_retries",
523 .data = &sysctl_tcp_orphan_retries,
524 .maxlen = sizeof(int),
525 .mode = 0644,
526 .proc_handler = proc_dointvec
527 },
528 {
529 .procname = "tcp_fack",
530 .data = &sysctl_tcp_fack,
531 .maxlen = sizeof(int),
532 .mode = 0644,
533 .proc_handler = proc_dointvec
534 },
535 {
536 .procname = "tcp_reordering",
537 .data = &sysctl_tcp_reordering,
538 .maxlen = sizeof(int),
539 .mode = 0644,
540 .proc_handler = proc_dointvec
541 },
542 {
543 .procname = "tcp_dsack",
544 .data = &sysctl_tcp_dsack,
545 .maxlen = sizeof(int),
546 .mode = 0644,
547 .proc_handler = proc_dointvec
548 },
549 {
550 .procname = "tcp_wmem",
551 .data = &sysctl_tcp_wmem,
552 .maxlen = sizeof(sysctl_tcp_wmem),
553 .mode = 0644,
554 .proc_handler = proc_dointvec_minmax,
555 .extra1 = &one,
556 },
557 {
558 .procname = "tcp_notsent_lowat",
559 .data = &sysctl_tcp_notsent_lowat,
560 .maxlen = sizeof(sysctl_tcp_notsent_lowat),
561 .mode = 0644,
562 .proc_handler = proc_dointvec,
563 },
564 {
565 .procname = "tcp_rmem",
566 .data = &sysctl_tcp_rmem,
567 .maxlen = sizeof(sysctl_tcp_rmem),
568 .mode = 0644,
569 .proc_handler = proc_dointvec_minmax,
570 .extra1 = &one,
571 },
572 {
573 .procname = "tcp_app_win",
574 .data = &sysctl_tcp_app_win,
575 .maxlen = sizeof(int),
576 .mode = 0644,
577 .proc_handler = proc_dointvec
578 },
579 {
580 .procname = "tcp_adv_win_scale",
581 .data = &sysctl_tcp_adv_win_scale,
582 .maxlen = sizeof(int),
583 .mode = 0644,
584 .proc_handler = proc_dointvec_minmax,
585 .extra1 = &tcp_adv_win_scale_min,
586 .extra2 = &tcp_adv_win_scale_max,
587 },
588 {
589 .procname = "tcp_tw_reuse",
590 .data = &sysctl_tcp_tw_reuse,
591 .maxlen = sizeof(int),
592 .mode = 0644,
593 .proc_handler = proc_dointvec
594 },
595 {
596 .procname = "tcp_frto",
597 .data = &sysctl_tcp_frto,
598 .maxlen = sizeof(int),
599 .mode = 0644,
600 .proc_handler = proc_dointvec
601 },
602 {
603 .procname = "tcp_low_latency",
604 .data = &sysctl_tcp_low_latency,
605 .maxlen = sizeof(int),
606 .mode = 0644,
607 .proc_handler = proc_dointvec
608 },
609 {
610 .procname = "tcp_no_metrics_save",
611 .data = &sysctl_tcp_nometrics_save,
612 .maxlen = sizeof(int),
613 .mode = 0644,
614 .proc_handler = proc_dointvec,
615 },
616 {
617 .procname = "tcp_moderate_rcvbuf",
618 .data = &sysctl_tcp_moderate_rcvbuf,
619 .maxlen = sizeof(int),
620 .mode = 0644,
621 .proc_handler = proc_dointvec,
622 },
623 {
624 .procname = "tcp_tso_win_divisor",
625 .data = &sysctl_tcp_tso_win_divisor,
626 .maxlen = sizeof(int),
627 .mode = 0644,
628 .proc_handler = proc_dointvec,
629 },
630 {
631 .procname = "tcp_congestion_control",
632 .mode = 0644,
633 .maxlen = TCP_CA_NAME_MAX,
634 .proc_handler = proc_tcp_congestion_control,
635 },
636 {
637 .procname = "tcp_mtu_probing",
638 .data = &sysctl_tcp_mtu_probing,
639 .maxlen = sizeof(int),
640 .mode = 0644,
641 .proc_handler = proc_dointvec,
642 },
643 {
644 .procname = "tcp_base_mss",
645 .data = &sysctl_tcp_base_mss,
646 .maxlen = sizeof(int),
647 .mode = 0644,
648 .proc_handler = proc_dointvec,
649 },
650 {
651 .procname = "tcp_workaround_signed_windows",
652 .data = &sysctl_tcp_workaround_signed_windows,
653 .maxlen = sizeof(int),
654 .mode = 0644,
655 .proc_handler = proc_dointvec
656 },
657 {
658 .procname = "tcp_limit_output_bytes",
659 .data = &sysctl_tcp_limit_output_bytes,
660 .maxlen = sizeof(int),
661 .mode = 0644,
662 .proc_handler = proc_dointvec
663 },
664 {
665 .procname = "tcp_challenge_ack_limit",
666 .data = &sysctl_tcp_challenge_ack_limit,
667 .maxlen = sizeof(int),
668 .mode = 0644,
669 .proc_handler = proc_dointvec
670 },
671 #ifdef CONFIG_NET_DMA
672 {
673 .procname = "tcp_dma_copybreak",
674 .data = &sysctl_tcp_dma_copybreak,
675 .maxlen = sizeof(int),
676 .mode = 0644,
677 .proc_handler = proc_dointvec
678 },
679 #endif
680 {
681 .procname = "tcp_slow_start_after_idle",
682 .data = &sysctl_tcp_slow_start_after_idle,
683 .maxlen = sizeof(int),
684 .mode = 0644,
685 .proc_handler = proc_dointvec
686 },
687 #ifdef CONFIG_NETLABEL
688 {
689 .procname = "cipso_cache_enable",
690 .data = &cipso_v4_cache_enabled,
691 .maxlen = sizeof(int),
692 .mode = 0644,
693 .proc_handler = proc_dointvec,
694 },
695 {
696 .procname = "cipso_cache_bucket_size",
697 .data = &cipso_v4_cache_bucketsize,
698 .maxlen = sizeof(int),
699 .mode = 0644,
700 .proc_handler = proc_dointvec,
701 },
702 {
703 .procname = "cipso_rbm_optfmt",
704 .data = &cipso_v4_rbm_optfmt,
705 .maxlen = sizeof(int),
706 .mode = 0644,
707 .proc_handler = proc_dointvec,
708 },
709 {
710 .procname = "cipso_rbm_strictvalid",
711 .data = &cipso_v4_rbm_strictvalid,
712 .maxlen = sizeof(int),
713 .mode = 0644,
714 .proc_handler = proc_dointvec,
715 },
716 #endif /* CONFIG_NETLABEL */
717 {
718 .procname = "tcp_available_congestion_control",
719 .maxlen = TCP_CA_BUF_MAX,
720 .mode = 0444,
721 .proc_handler = proc_tcp_available_congestion_control,
722 },
723 {
724 .procname = "tcp_allowed_congestion_control",
725 .maxlen = TCP_CA_BUF_MAX,
726 .mode = 0644,
727 .proc_handler = proc_allowed_congestion_control,
728 },
729 {
730 .procname = "tcp_max_ssthresh",
731 .data = &sysctl_tcp_max_ssthresh,
732 .maxlen = sizeof(int),
733 .mode = 0644,
734 .proc_handler = proc_dointvec,
735 },
736 {
737 .procname = "tcp_thin_linear_timeouts",
738 .data = &sysctl_tcp_thin_linear_timeouts,
739 .maxlen = sizeof(int),
740 .mode = 0644,
741 .proc_handler = proc_dointvec
742 },
743 {
744 .procname = "tcp_thin_dupack",
745 .data = &sysctl_tcp_thin_dupack,
746 .maxlen = sizeof(int),
747 .mode = 0644,
748 .proc_handler = proc_dointvec
749 },
750 {
751 .procname = "tcp_early_retrans",
752 .data = &sysctl_tcp_early_retrans,
753 .maxlen = sizeof(int),
754 .mode = 0644,
755 .proc_handler = proc_dointvec_minmax,
756 .extra1 = &zero,
757 .extra2 = &four,
758 },
759 {
760 .procname = "udp_mem",
761 .data = &sysctl_udp_mem,
762 .maxlen = sizeof(sysctl_udp_mem),
763 .mode = 0644,
764 .proc_handler = proc_doulongvec_minmax,
765 },
766 {
767 .procname = "udp_rmem_min",
768 .data = &sysctl_udp_rmem_min,
769 .maxlen = sizeof(sysctl_udp_rmem_min),
770 .mode = 0644,
771 .proc_handler = proc_dointvec_minmax,
772 .extra1 = &one
773 },
774 {
775 .procname = "udp_wmem_min",
776 .data = &sysctl_udp_wmem_min,
777 .maxlen = sizeof(sysctl_udp_wmem_min),
778 .mode = 0644,
779 .proc_handler = proc_dointvec_minmax,
780 .extra1 = &one
781 },
782 { }
783 };
784
785 static struct ctl_table ipv4_net_table[] = {
786 {
787 .procname = "icmp_echo_ignore_all",
788 .data = &init_net.ipv4.sysctl_icmp_echo_ignore_all,
789 .maxlen = sizeof(int),
790 .mode = 0644,
791 .proc_handler = proc_dointvec
792 },
793 {
794 .procname = "icmp_echo_ignore_broadcasts",
795 .data = &init_net.ipv4.sysctl_icmp_echo_ignore_broadcasts,
796 .maxlen = sizeof(int),
797 .mode = 0644,
798 .proc_handler = proc_dointvec
799 },
800 {
801 .procname = "icmp_ignore_bogus_error_responses",
802 .data = &init_net.ipv4.sysctl_icmp_ignore_bogus_error_responses,
803 .maxlen = sizeof(int),
804 .mode = 0644,
805 .proc_handler = proc_dointvec
806 },
807 {
808 .procname = "icmp_errors_use_inbound_ifaddr",
809 .data = &init_net.ipv4.sysctl_icmp_errors_use_inbound_ifaddr,
810 .maxlen = sizeof(int),
811 .mode = 0644,
812 .proc_handler = proc_dointvec
813 },
814 {
815 .procname = "icmp_ratelimit",
816 .data = &init_net.ipv4.sysctl_icmp_ratelimit,
817 .maxlen = sizeof(int),
818 .mode = 0644,
819 .proc_handler = proc_dointvec_ms_jiffies,
820 },
821 {
822 .procname = "icmp_ratemask",
823 .data = &init_net.ipv4.sysctl_icmp_ratemask,
824 .maxlen = sizeof(int),
825 .mode = 0644,
826 .proc_handler = proc_dointvec
827 },
828 {
829 .procname = "ping_group_range",
830 .data = &init_net.ipv4.sysctl_ping_group_range,
831 .maxlen = sizeof(gid_t)*2,
832 .mode = 0644,
833 .proc_handler = ipv4_ping_group_range,
834 },
835 {
836 .procname = "tcp_ecn",
837 .data = &init_net.ipv4.sysctl_tcp_ecn,
838 .maxlen = sizeof(int),
839 .mode = 0644,
840 .proc_handler = proc_dointvec
841 },
842 {
843 .procname = "tcp_mem",
844 .maxlen = sizeof(init_net.ipv4.sysctl_tcp_mem),
845 .mode = 0644,
846 .proc_handler = ipv4_tcp_mem,
847 },
848 { }
849 };
850
851 static __net_init int ipv4_sysctl_init_net(struct net *net)
852 {
853 struct ctl_table *table;
854
855 table = ipv4_net_table;
856 if (!net_eq(net, &init_net)) {
857 table = kmemdup(table, sizeof(ipv4_net_table), GFP_KERNEL);
858 if (table == NULL)
859 goto err_alloc;
860
861 table[0].data =
862 &net->ipv4.sysctl_icmp_echo_ignore_all;
863 table[1].data =
864 &net->ipv4.sysctl_icmp_echo_ignore_broadcasts;
865 table[2].data =
866 &net->ipv4.sysctl_icmp_ignore_bogus_error_responses;
867 table[3].data =
868 &net->ipv4.sysctl_icmp_errors_use_inbound_ifaddr;
869 table[4].data =
870 &net->ipv4.sysctl_icmp_ratelimit;
871 table[5].data =
872 &net->ipv4.sysctl_icmp_ratemask;
873 table[6].data =
874 &net->ipv4.sysctl_ping_group_range;
875 table[7].data =
876 &net->ipv4.sysctl_tcp_ecn;
877
878 /* Don't export sysctls to unprivileged users */
879 if (net->user_ns != &init_user_ns)
880 table[0].procname = NULL;
881 }
882
883 /*
884 * Sane defaults - nobody may create ping sockets.
885 * Boot scripts should set this to distro-specific group.
886 */
887 net->ipv4.sysctl_ping_group_range[0] = make_kgid(&init_user_ns, 1);
888 net->ipv4.sysctl_ping_group_range[1] = make_kgid(&init_user_ns, 0);
889
890 tcp_init_mem(net);
891
892 net->ipv4.ipv4_hdr = register_net_sysctl(net, "net/ipv4", table);
893 if (net->ipv4.ipv4_hdr == NULL)
894 goto err_reg;
895
896 return 0;
897
898 err_reg:
899 if (!net_eq(net, &init_net))
900 kfree(table);
901 err_alloc:
902 return -ENOMEM;
903 }
904
905 static __net_exit void ipv4_sysctl_exit_net(struct net *net)
906 {
907 struct ctl_table *table;
908
909 table = net->ipv4.ipv4_hdr->ctl_table_arg;
910 unregister_net_sysctl_table(net->ipv4.ipv4_hdr);
911 kfree(table);
912 }
913
914 static __net_initdata struct pernet_operations ipv4_sysctl_ops = {
915 .init = ipv4_sysctl_init_net,
916 .exit = ipv4_sysctl_exit_net,
917 };
918
919 static __init int sysctl_ipv4_init(void)
920 {
921 struct ctl_table_header *hdr;
922 struct ctl_table *i;
923
924 for (i = ipv4_table; i->procname; i++) {
925 if (strcmp(i->procname, "ip_local_reserved_ports") == 0) {
926 i->data = sysctl_local_reserved_ports;
927 break;
928 }
929 }
930 if (!i->procname)
931 return -EINVAL;
932
933 hdr = register_net_sysctl(&init_net, "net/ipv4", ipv4_table);
934 if (hdr == NULL)
935 return -ENOMEM;
936
937 if (register_pernet_subsys(&ipv4_sysctl_ops)) {
938 unregister_net_sysctl_table(hdr);
939 return -ENOMEM;
940 }
941
942 return 0;
943 }
944
945 __initcall(sysctl_ipv4_init);
Linux kernel - Deliverables
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