2 * sysctl_net_ipv4.c: sysctl interface to net IPV4 subsystem.
4 * Begun April 1, 1996, Mike Shaver.
5 * Added /proc/sys/net/ipv4 directory entry (empty =) ). [MS]
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>
19 #include <net/route.h>
22 #include <net/cipso_ipv4.h>
23 #include <net/inet_frag.h>
26 static int tcp_retr1_max = 255;
27 static int ip_local_port_range_min[] = { 1, 1 };
28 static int ip_local_port_range_max[] = { 65535, 65535 };
30 /* Update system visible IP port range */
31 static void set_local_port_range(int range[2])
33 write_seqlock(&sysctl_local_ports.lock);
34 sysctl_local_ports.range[0] = range[0];
35 sysctl_local_ports.range[1] = range[1];
36 write_sequnlock(&sysctl_local_ports.lock);
39 /* Validate changes from /proc interface. */
40 static int ipv4_local_port_range(ctl_table *table, int write,
42 size_t *lenp, loff_t *ppos)
48 .maxlen = sizeof(range),
50 .extra1 = &ip_local_port_range_min,
51 .extra2 = &ip_local_port_range_max,
54 inet_get_local_port_range(range, range + 1);
55 ret = proc_dointvec_minmax(&tmp, write, buffer, lenp, ppos);
57 if (write && ret == 0) {
58 if (range[1] < range[0])
61 set_local_port_range(range);
67 static int proc_tcp_congestion_control(ctl_table *ctl, int write,
68 void __user *buffer, size_t *lenp, loff_t *ppos)
70 char val[TCP_CA_NAME_MAX];
73 .maxlen = TCP_CA_NAME_MAX,
77 tcp_get_default_congestion_control(val);
79 ret = proc_dostring(&tbl, write, buffer, lenp, ppos);
80 if (write && ret == 0)
81 ret = tcp_set_default_congestion_control(val);
85 static int proc_tcp_available_congestion_control(ctl_table *ctl,
87 void __user *buffer, size_t *lenp,
90 ctl_table tbl = { .maxlen = TCP_CA_BUF_MAX, };
93 tbl.data = kmalloc(tbl.maxlen, GFP_USER);
96 tcp_get_available_congestion_control(tbl.data, TCP_CA_BUF_MAX);
97 ret = proc_dostring(&tbl, write, buffer, lenp, ppos);
102 static int proc_allowed_congestion_control(ctl_table *ctl,
104 void __user *buffer, size_t *lenp,
107 ctl_table tbl = { .maxlen = TCP_CA_BUF_MAX };
110 tbl.data = kmalloc(tbl.maxlen, GFP_USER);
114 tcp_get_allowed_congestion_control(tbl.data, tbl.maxlen);
115 ret = proc_dostring(&tbl, write, buffer, lenp, ppos);
116 if (write && ret == 0)
117 ret = tcp_set_allowed_congestion_control(tbl.data);
122 static struct ctl_table ipv4_table[] = {
124 .procname = "tcp_timestamps",
125 .data = &sysctl_tcp_timestamps,
126 .maxlen = sizeof(int),
128 .proc_handler = proc_dointvec
131 .procname = "tcp_window_scaling",
132 .data = &sysctl_tcp_window_scaling,
133 .maxlen = sizeof(int),
135 .proc_handler = proc_dointvec
138 .procname = "tcp_sack",
139 .data = &sysctl_tcp_sack,
140 .maxlen = sizeof(int),
142 .proc_handler = proc_dointvec
145 .procname = "tcp_retrans_collapse",
146 .data = &sysctl_tcp_retrans_collapse,
147 .maxlen = sizeof(int),
149 .proc_handler = proc_dointvec
152 .procname = "ip_default_ttl",
153 .data = &sysctl_ip_default_ttl,
154 .maxlen = sizeof(int),
156 .proc_handler = ipv4_doint_and_flush,
160 .procname = "ip_no_pmtu_disc",
161 .data = &ipv4_config.no_pmtu_disc,
162 .maxlen = sizeof(int),
164 .proc_handler = proc_dointvec
167 .procname = "ip_nonlocal_bind",
168 .data = &sysctl_ip_nonlocal_bind,
169 .maxlen = sizeof(int),
171 .proc_handler = proc_dointvec
174 .procname = "tcp_syn_retries",
175 .data = &sysctl_tcp_syn_retries,
176 .maxlen = sizeof(int),
178 .proc_handler = proc_dointvec
181 .procname = "tcp_synack_retries",
182 .data = &sysctl_tcp_synack_retries,
183 .maxlen = sizeof(int),
185 .proc_handler = proc_dointvec
188 .procname = "tcp_max_orphans",
189 .data = &sysctl_tcp_max_orphans,
190 .maxlen = sizeof(int),
192 .proc_handler = proc_dointvec
195 .procname = "tcp_max_tw_buckets",
196 .data = &tcp_death_row.sysctl_max_tw_buckets,
197 .maxlen = sizeof(int),
199 .proc_handler = proc_dointvec
202 .procname = "ip_dynaddr",
203 .data = &sysctl_ip_dynaddr,
204 .maxlen = sizeof(int),
206 .proc_handler = proc_dointvec
209 .procname = "tcp_keepalive_time",
210 .data = &sysctl_tcp_keepalive_time,
211 .maxlen = sizeof(int),
213 .proc_handler = proc_dointvec_jiffies,
216 .procname = "tcp_keepalive_probes",
217 .data = &sysctl_tcp_keepalive_probes,
218 .maxlen = sizeof(int),
220 .proc_handler = proc_dointvec
223 .procname = "tcp_keepalive_intvl",
224 .data = &sysctl_tcp_keepalive_intvl,
225 .maxlen = sizeof(int),
227 .proc_handler = proc_dointvec_jiffies,
230 .procname = "tcp_retries1",
231 .data = &sysctl_tcp_retries1,
232 .maxlen = sizeof(int),
234 .proc_handler = proc_dointvec_minmax,
235 .extra2 = &tcp_retr1_max
238 .procname = "tcp_retries2",
239 .data = &sysctl_tcp_retries2,
240 .maxlen = sizeof(int),
242 .proc_handler = proc_dointvec
245 .procname = "tcp_fin_timeout",
246 .data = &sysctl_tcp_fin_timeout,
247 .maxlen = sizeof(int),
249 .proc_handler = proc_dointvec_jiffies,
251 #ifdef CONFIG_SYN_COOKIES
253 .procname = "tcp_syncookies",
254 .data = &sysctl_tcp_syncookies,
255 .maxlen = sizeof(int),
257 .proc_handler = proc_dointvec
261 .procname = "tcp_tw_recycle",
262 .data = &tcp_death_row.sysctl_tw_recycle,
263 .maxlen = sizeof(int),
265 .proc_handler = proc_dointvec
268 .procname = "tcp_abort_on_overflow",
269 .data = &sysctl_tcp_abort_on_overflow,
270 .maxlen = sizeof(int),
272 .proc_handler = proc_dointvec
275 .procname = "tcp_stdurg",
276 .data = &sysctl_tcp_stdurg,
277 .maxlen = sizeof(int),
279 .proc_handler = proc_dointvec
282 .procname = "tcp_rfc1337",
283 .data = &sysctl_tcp_rfc1337,
284 .maxlen = sizeof(int),
286 .proc_handler = proc_dointvec
289 .procname = "tcp_max_syn_backlog",
290 .data = &sysctl_max_syn_backlog,
291 .maxlen = sizeof(int),
293 .proc_handler = proc_dointvec
296 .procname = "ip_local_port_range",
297 .data = &sysctl_local_ports.range,
298 .maxlen = sizeof(sysctl_local_ports.range),
300 .proc_handler = ipv4_local_port_range,
302 #ifdef CONFIG_IP_MULTICAST
304 .procname = "igmp_max_memberships",
305 .data = &sysctl_igmp_max_memberships,
306 .maxlen = sizeof(int),
308 .proc_handler = proc_dointvec
313 .procname = "igmp_max_msf",
314 .data = &sysctl_igmp_max_msf,
315 .maxlen = sizeof(int),
317 .proc_handler = proc_dointvec
320 .procname = "inet_peer_threshold",
321 .data = &inet_peer_threshold,
322 .maxlen = sizeof(int),
324 .proc_handler = proc_dointvec
327 .procname = "inet_peer_minttl",
328 .data = &inet_peer_minttl,
329 .maxlen = sizeof(int),
331 .proc_handler = proc_dointvec_jiffies,
334 .procname = "inet_peer_maxttl",
335 .data = &inet_peer_maxttl,
336 .maxlen = sizeof(int),
338 .proc_handler = proc_dointvec_jiffies,
341 .procname = "inet_peer_gc_mintime",
342 .data = &inet_peer_gc_mintime,
343 .maxlen = sizeof(int),
345 .proc_handler = proc_dointvec_jiffies,
348 .procname = "inet_peer_gc_maxtime",
349 .data = &inet_peer_gc_maxtime,
350 .maxlen = sizeof(int),
352 .proc_handler = proc_dointvec_jiffies,
355 .procname = "tcp_orphan_retries",
356 .data = &sysctl_tcp_orphan_retries,
357 .maxlen = sizeof(int),
359 .proc_handler = proc_dointvec
362 .procname = "tcp_fack",
363 .data = &sysctl_tcp_fack,
364 .maxlen = sizeof(int),
366 .proc_handler = proc_dointvec
369 .procname = "tcp_reordering",
370 .data = &sysctl_tcp_reordering,
371 .maxlen = sizeof(int),
373 .proc_handler = proc_dointvec
376 .procname = "tcp_ecn",
377 .data = &sysctl_tcp_ecn,
378 .maxlen = sizeof(int),
380 .proc_handler = proc_dointvec
383 .procname = "tcp_dsack",
384 .data = &sysctl_tcp_dsack,
385 .maxlen = sizeof(int),
387 .proc_handler = proc_dointvec
390 .procname = "tcp_mem",
391 .data = &sysctl_tcp_mem,
392 .maxlen = sizeof(sysctl_tcp_mem),
394 .proc_handler = proc_dointvec
397 .procname = "tcp_wmem",
398 .data = &sysctl_tcp_wmem,
399 .maxlen = sizeof(sysctl_tcp_wmem),
401 .proc_handler = proc_dointvec
404 .procname = "tcp_rmem",
405 .data = &sysctl_tcp_rmem,
406 .maxlen = sizeof(sysctl_tcp_rmem),
408 .proc_handler = proc_dointvec
411 .procname = "tcp_app_win",
412 .data = &sysctl_tcp_app_win,
413 .maxlen = sizeof(int),
415 .proc_handler = proc_dointvec
418 .procname = "tcp_adv_win_scale",
419 .data = &sysctl_tcp_adv_win_scale,
420 .maxlen = sizeof(int),
422 .proc_handler = proc_dointvec
425 .procname = "tcp_tw_reuse",
426 .data = &sysctl_tcp_tw_reuse,
427 .maxlen = sizeof(int),
429 .proc_handler = proc_dointvec
432 .procname = "tcp_frto",
433 .data = &sysctl_tcp_frto,
434 .maxlen = sizeof(int),
436 .proc_handler = proc_dointvec
439 .procname = "tcp_frto_response",
440 .data = &sysctl_tcp_frto_response,
441 .maxlen = sizeof(int),
443 .proc_handler = proc_dointvec
446 .procname = "tcp_low_latency",
447 .data = &sysctl_tcp_low_latency,
448 .maxlen = sizeof(int),
450 .proc_handler = proc_dointvec
453 .procname = "tcp_no_metrics_save",
454 .data = &sysctl_tcp_nometrics_save,
455 .maxlen = sizeof(int),
457 .proc_handler = proc_dointvec,
460 .procname = "tcp_moderate_rcvbuf",
461 .data = &sysctl_tcp_moderate_rcvbuf,
462 .maxlen = sizeof(int),
464 .proc_handler = proc_dointvec,
467 .procname = "tcp_tso_win_divisor",
468 .data = &sysctl_tcp_tso_win_divisor,
469 .maxlen = sizeof(int),
471 .proc_handler = proc_dointvec,
474 .procname = "tcp_congestion_control",
476 .maxlen = TCP_CA_NAME_MAX,
477 .proc_handler = proc_tcp_congestion_control,
480 .procname = "tcp_abc",
481 .data = &sysctl_tcp_abc,
482 .maxlen = sizeof(int),
484 .proc_handler = proc_dointvec,
487 .procname = "tcp_mtu_probing",
488 .data = &sysctl_tcp_mtu_probing,
489 .maxlen = sizeof(int),
491 .proc_handler = proc_dointvec,
494 .procname = "tcp_base_mss",
495 .data = &sysctl_tcp_base_mss,
496 .maxlen = sizeof(int),
498 .proc_handler = proc_dointvec,
501 .procname = "tcp_workaround_signed_windows",
502 .data = &sysctl_tcp_workaround_signed_windows,
503 .maxlen = sizeof(int),
505 .proc_handler = proc_dointvec
507 #ifdef CONFIG_NET_DMA
509 .procname = "tcp_dma_copybreak",
510 .data = &sysctl_tcp_dma_copybreak,
511 .maxlen = sizeof(int),
513 .proc_handler = proc_dointvec
517 .procname = "tcp_slow_start_after_idle",
518 .data = &sysctl_tcp_slow_start_after_idle,
519 .maxlen = sizeof(int),
521 .proc_handler = proc_dointvec
523 #ifdef CONFIG_NETLABEL
525 .procname = "cipso_cache_enable",
526 .data = &cipso_v4_cache_enabled,
527 .maxlen = sizeof(int),
529 .proc_handler = proc_dointvec,
532 .procname = "cipso_cache_bucket_size",
533 .data = &cipso_v4_cache_bucketsize,
534 .maxlen = sizeof(int),
536 .proc_handler = proc_dointvec,
539 .procname = "cipso_rbm_optfmt",
540 .data = &cipso_v4_rbm_optfmt,
541 .maxlen = sizeof(int),
543 .proc_handler = proc_dointvec,
546 .procname = "cipso_rbm_strictvalid",
547 .data = &cipso_v4_rbm_strictvalid,
548 .maxlen = sizeof(int),
550 .proc_handler = proc_dointvec,
552 #endif /* CONFIG_NETLABEL */
554 .procname = "tcp_available_congestion_control",
555 .maxlen = TCP_CA_BUF_MAX,
557 .proc_handler = proc_tcp_available_congestion_control,
560 .procname = "tcp_allowed_congestion_control",
561 .maxlen = TCP_CA_BUF_MAX,
563 .proc_handler = proc_allowed_congestion_control,
566 .procname = "tcp_max_ssthresh",
567 .data = &sysctl_tcp_max_ssthresh,
568 .maxlen = sizeof(int),
570 .proc_handler = proc_dointvec,
573 .procname = "tcp_cookie_size",
574 .data = &sysctl_tcp_cookie_size,
575 .maxlen = sizeof(int),
577 .proc_handler = proc_dointvec
580 .procname = "tcp_thin_linear_timeouts",
581 .data = &sysctl_tcp_thin_linear_timeouts,
582 .maxlen = sizeof(int),
584 .proc_handler = proc_dointvec
587 .procname = "tcp_thin_dupack",
588 .data = &sysctl_tcp_thin_dupack,
589 .maxlen = sizeof(int),
591 .proc_handler = proc_dointvec
594 .procname = "udp_mem",
595 .data = &sysctl_udp_mem,
596 .maxlen = sizeof(sysctl_udp_mem),
598 .proc_handler = proc_dointvec_minmax,
602 .procname = "udp_rmem_min",
603 .data = &sysctl_udp_rmem_min,
604 .maxlen = sizeof(sysctl_udp_rmem_min),
606 .proc_handler = proc_dointvec_minmax,
610 .procname = "udp_wmem_min",
611 .data = &sysctl_udp_wmem_min,
612 .maxlen = sizeof(sysctl_udp_wmem_min),
614 .proc_handler = proc_dointvec_minmax,
620 static struct ctl_table ipv4_net_table[] = {
622 .procname = "icmp_echo_ignore_all",
623 .data = &init_net.ipv4.sysctl_icmp_echo_ignore_all,
624 .maxlen = sizeof(int),
626 .proc_handler = proc_dointvec
629 .procname = "icmp_echo_ignore_broadcasts",
630 .data = &init_net.ipv4.sysctl_icmp_echo_ignore_broadcasts,
631 .maxlen = sizeof(int),
633 .proc_handler = proc_dointvec
636 .procname = "icmp_ignore_bogus_error_responses",
637 .data = &init_net.ipv4.sysctl_icmp_ignore_bogus_error_responses,
638 .maxlen = sizeof(int),
640 .proc_handler = proc_dointvec
643 .procname = "icmp_errors_use_inbound_ifaddr",
644 .data = &init_net.ipv4.sysctl_icmp_errors_use_inbound_ifaddr,
645 .maxlen = sizeof(int),
647 .proc_handler = proc_dointvec
650 .procname = "icmp_ratelimit",
651 .data = &init_net.ipv4.sysctl_icmp_ratelimit,
652 .maxlen = sizeof(int),
654 .proc_handler = proc_dointvec_ms_jiffies,
657 .procname = "icmp_ratemask",
658 .data = &init_net.ipv4.sysctl_icmp_ratemask,
659 .maxlen = sizeof(int),
661 .proc_handler = proc_dointvec
664 .procname = "rt_cache_rebuild_count",
665 .data = &init_net.ipv4.sysctl_rt_cache_rebuild_count,
666 .maxlen = sizeof(int),
668 .proc_handler = proc_dointvec
673 struct ctl_path net_ipv4_ctl_path[] = {
674 { .procname = "net", },
675 { .procname = "ipv4", },
678 EXPORT_SYMBOL_GPL(net_ipv4_ctl_path);
680 static __net_init int ipv4_sysctl_init_net(struct net *net)
682 struct ctl_table *table;
684 table = ipv4_net_table;
685 if (!net_eq(net, &init_net)) {
686 table = kmemdup(table, sizeof(ipv4_net_table), GFP_KERNEL);
691 &net->ipv4.sysctl_icmp_echo_ignore_all;
693 &net->ipv4.sysctl_icmp_echo_ignore_broadcasts;
695 &net->ipv4.sysctl_icmp_ignore_bogus_error_responses;
697 &net->ipv4.sysctl_icmp_errors_use_inbound_ifaddr;
699 &net->ipv4.sysctl_icmp_ratelimit;
701 &net->ipv4.sysctl_icmp_ratemask;
703 &net->ipv4.sysctl_rt_cache_rebuild_count;
706 net->ipv4.sysctl_rt_cache_rebuild_count = 4;
708 net->ipv4.ipv4_hdr = register_net_sysctl_table(net,
709 net_ipv4_ctl_path, table);
710 if (net->ipv4.ipv4_hdr == NULL)
716 if (!net_eq(net, &init_net))
722 static __net_exit void ipv4_sysctl_exit_net(struct net *net)
724 struct ctl_table *table;
726 table = net->ipv4.ipv4_hdr->ctl_table_arg;
727 unregister_net_sysctl_table(net->ipv4.ipv4_hdr);
731 static __net_initdata struct pernet_operations ipv4_sysctl_ops = {
732 .init = ipv4_sysctl_init_net,
733 .exit = ipv4_sysctl_exit_net,
736 static __init int sysctl_ipv4_init(void)
738 struct ctl_table_header *hdr;
740 hdr = register_sysctl_paths(net_ipv4_ctl_path, ipv4_table);
744 if (register_pernet_subsys(&ipv4_sysctl_ops)) {
745 unregister_sysctl_table(hdr);
752 __initcall(sysctl_ipv4_init);