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>
16 #include <linux/nsproxy.h>
17 #include <linux/swap.h>
21 #include <net/route.h>
24 #include <net/cipso_ipv4.h>
25 #include <net/inet_frag.h>
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 };
45 /* Update system visible IP port range */
46 static void set_local_port_range(struct net *net, int range[2])
48 bool same_parity = !((range[0] ^ range[1]) & 1);
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");
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);
60 /* Validate changes from /proc interface. */
61 static int ipv4_local_port_range(struct ctl_table *table, int write,
63 size_t *lenp, loff_t *ppos)
66 container_of(table->data, struct net, ipv4.ip_local_ports.range);
69 struct ctl_table tmp = {
71 .maxlen = sizeof(range),
73 .extra1 = &ip_local_port_range_min,
74 .extra2 = &ip_local_port_range_max,
77 inet_get_local_port_range(net, &range[0], &range[1]);
79 ret = proc_dointvec_minmax(&tmp, write, buffer, lenp, ppos);
81 if (write && ret == 0) {
82 if (range[1] < range[0])
85 set_local_port_range(net, range);
92 static void inet_get_ping_group_range_table(struct ctl_table *table, kgid_t *low, kgid_t *high)
94 kgid_t *data = table->data;
96 container_of(table->data, struct net, ipv4.ping_group_range.range);
99 seq = read_seqbegin(&net->ipv4.ip_local_ports.lock);
103 } while (read_seqretry(&net->ipv4.ip_local_ports.lock, seq));
106 /* Update system visible IP port range */
107 static void set_ping_group_range(struct ctl_table *table, kgid_t low, kgid_t high)
109 kgid_t *data = table->data;
111 container_of(table->data, struct net, ipv4.ping_group_range.range);
112 write_seqlock(&net->ipv4.ip_local_ports.lock);
115 write_sequnlock(&net->ipv4.ip_local_ports.lock);
118 /* Validate changes from /proc interface. */
119 static int ipv4_ping_group_range(struct ctl_table *table, int write,
121 size_t *lenp, loff_t *ppos)
123 struct user_namespace *user_ns = current_user_ns();
127 struct ctl_table tmp = {
129 .maxlen = sizeof(urange),
131 .extra1 = &ip_ping_group_range_min,
132 .extra2 = &ip_ping_group_range_max,
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);
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);
148 set_ping_group_range(table, low, high);
154 static int proc_tcp_congestion_control(struct ctl_table *ctl, int write,
155 void __user *buffer, size_t *lenp, loff_t *ppos)
157 char val[TCP_CA_NAME_MAX];
158 struct ctl_table tbl = {
160 .maxlen = TCP_CA_NAME_MAX,
164 tcp_get_default_congestion_control(val);
166 ret = proc_dostring(&tbl, write, buffer, lenp, ppos);
167 if (write && ret == 0)
168 ret = tcp_set_default_congestion_control(val);
172 static int proc_tcp_available_congestion_control(struct ctl_table *ctl,
174 void __user *buffer, size_t *lenp,
177 struct ctl_table tbl = { .maxlen = TCP_CA_BUF_MAX, };
180 tbl.data = kmalloc(tbl.maxlen, GFP_USER);
183 tcp_get_available_congestion_control(tbl.data, TCP_CA_BUF_MAX);
184 ret = proc_dostring(&tbl, write, buffer, lenp, ppos);
189 static int proc_allowed_congestion_control(struct ctl_table *ctl,
191 void __user *buffer, size_t *lenp,
194 struct ctl_table tbl = { .maxlen = TCP_CA_BUF_MAX };
197 tbl.data = kmalloc(tbl.maxlen, GFP_USER);
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);
209 static int proc_tcp_fastopen_key(struct ctl_table *ctl, int write,
210 void __user *buffer, size_t *lenp,
213 struct ctl_table tbl = { .maxlen = (TCP_FASTOPEN_KEY_LENGTH * 2 + 10) };
214 struct tcp_fastopen_context *ctxt;
216 u32 user_key[4]; /* 16 bytes, matching TCP_FASTOPEN_KEY_LENGTH */
218 tbl.data = kmalloc(tbl.maxlen, GFP_KERNEL);
223 ctxt = rcu_dereference(tcp_fastopen_ctx);
225 memcpy(user_key, ctxt->key, TCP_FASTOPEN_KEY_LENGTH);
227 memset(user_key, 0, sizeof(user_key));
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);
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) {
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
244 tcp_fastopen_init_key_once(false);
245 tcp_fastopen_reset_cipher(user_key, TCP_FASTOPEN_KEY_LENGTH);
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);
256 static struct ctl_table ipv4_table[] = {
258 .procname = "tcp_timestamps",
259 .data = &sysctl_tcp_timestamps,
260 .maxlen = sizeof(int),
262 .proc_handler = proc_dointvec
265 .procname = "tcp_window_scaling",
266 .data = &sysctl_tcp_window_scaling,
267 .maxlen = sizeof(int),
269 .proc_handler = proc_dointvec
272 .procname = "tcp_sack",
273 .data = &sysctl_tcp_sack,
274 .maxlen = sizeof(int),
276 .proc_handler = proc_dointvec
279 .procname = "tcp_retrans_collapse",
280 .data = &sysctl_tcp_retrans_collapse,
281 .maxlen = sizeof(int),
283 .proc_handler = proc_dointvec
286 .procname = "ip_default_ttl",
287 .data = &sysctl_ip_default_ttl,
288 .maxlen = sizeof(int),
290 .proc_handler = proc_dointvec_minmax,
291 .extra1 = &ip_ttl_min,
292 .extra2 = &ip_ttl_max,
295 .procname = "tcp_syn_retries",
296 .data = &sysctl_tcp_syn_retries,
297 .maxlen = sizeof(int),
299 .proc_handler = proc_dointvec_minmax,
300 .extra1 = &tcp_syn_retries_min,
301 .extra2 = &tcp_syn_retries_max
304 .procname = "tcp_synack_retries",
305 .data = &sysctl_tcp_synack_retries,
306 .maxlen = sizeof(int),
308 .proc_handler = proc_dointvec
311 .procname = "tcp_max_orphans",
312 .data = &sysctl_tcp_max_orphans,
313 .maxlen = sizeof(int),
315 .proc_handler = proc_dointvec
318 .procname = "tcp_max_tw_buckets",
319 .data = &tcp_death_row.sysctl_max_tw_buckets,
320 .maxlen = sizeof(int),
322 .proc_handler = proc_dointvec
325 .procname = "ip_early_demux",
326 .data = &sysctl_ip_early_demux,
327 .maxlen = sizeof(int),
329 .proc_handler = proc_dointvec
332 .procname = "ip_dynaddr",
333 .data = &sysctl_ip_dynaddr,
334 .maxlen = sizeof(int),
336 .proc_handler = proc_dointvec
339 .procname = "tcp_retries1",
340 .data = &sysctl_tcp_retries1,
341 .maxlen = sizeof(int),
343 .proc_handler = proc_dointvec_minmax,
344 .extra2 = &tcp_retr1_max
347 .procname = "tcp_retries2",
348 .data = &sysctl_tcp_retries2,
349 .maxlen = sizeof(int),
351 .proc_handler = proc_dointvec
354 .procname = "tcp_fin_timeout",
355 .data = &sysctl_tcp_fin_timeout,
356 .maxlen = sizeof(int),
358 .proc_handler = proc_dointvec_jiffies,
360 #ifdef CONFIG_SYN_COOKIES
362 .procname = "tcp_syncookies",
363 .data = &sysctl_tcp_syncookies,
364 .maxlen = sizeof(int),
366 .proc_handler = proc_dointvec
370 .procname = "tcp_fastopen",
371 .data = &sysctl_tcp_fastopen,
372 .maxlen = sizeof(int),
374 .proc_handler = proc_dointvec,
377 .procname = "tcp_fastopen_key",
379 .maxlen = ((TCP_FASTOPEN_KEY_LENGTH * 2) + 10),
380 .proc_handler = proc_tcp_fastopen_key,
383 .procname = "tcp_tw_recycle",
384 .data = &tcp_death_row.sysctl_tw_recycle,
385 .maxlen = sizeof(int),
387 .proc_handler = proc_dointvec
390 .procname = "tcp_abort_on_overflow",
391 .data = &sysctl_tcp_abort_on_overflow,
392 .maxlen = sizeof(int),
394 .proc_handler = proc_dointvec
397 .procname = "tcp_stdurg",
398 .data = &sysctl_tcp_stdurg,
399 .maxlen = sizeof(int),
401 .proc_handler = proc_dointvec
404 .procname = "tcp_rfc1337",
405 .data = &sysctl_tcp_rfc1337,
406 .maxlen = sizeof(int),
408 .proc_handler = proc_dointvec
411 .procname = "tcp_max_syn_backlog",
412 .data = &sysctl_max_syn_backlog,
413 .maxlen = sizeof(int),
415 .proc_handler = proc_dointvec
418 .procname = "igmp_max_memberships",
419 .data = &sysctl_igmp_max_memberships,
420 .maxlen = sizeof(int),
422 .proc_handler = proc_dointvec
425 .procname = "igmp_max_msf",
426 .data = &sysctl_igmp_max_msf,
427 .maxlen = sizeof(int),
429 .proc_handler = proc_dointvec
431 #ifdef CONFIG_IP_MULTICAST
433 .procname = "igmp_qrv",
434 .data = &sysctl_igmp_qrv,
435 .maxlen = sizeof(int),
437 .proc_handler = proc_dointvec_minmax,
442 .procname = "inet_peer_threshold",
443 .data = &inet_peer_threshold,
444 .maxlen = sizeof(int),
446 .proc_handler = proc_dointvec
449 .procname = "inet_peer_minttl",
450 .data = &inet_peer_minttl,
451 .maxlen = sizeof(int),
453 .proc_handler = proc_dointvec_jiffies,
456 .procname = "inet_peer_maxttl",
457 .data = &inet_peer_maxttl,
458 .maxlen = sizeof(int),
460 .proc_handler = proc_dointvec_jiffies,
463 .procname = "tcp_orphan_retries",
464 .data = &sysctl_tcp_orphan_retries,
465 .maxlen = sizeof(int),
467 .proc_handler = proc_dointvec
470 .procname = "tcp_fack",
471 .data = &sysctl_tcp_fack,
472 .maxlen = sizeof(int),
474 .proc_handler = proc_dointvec
477 .procname = "tcp_recovery",
478 .data = &sysctl_tcp_recovery,
479 .maxlen = sizeof(int),
481 .proc_handler = proc_dointvec,
484 .procname = "tcp_reordering",
485 .data = &sysctl_tcp_reordering,
486 .maxlen = sizeof(int),
488 .proc_handler = proc_dointvec
491 .procname = "tcp_max_reordering",
492 .data = &sysctl_tcp_max_reordering,
493 .maxlen = sizeof(int),
495 .proc_handler = proc_dointvec
498 .procname = "tcp_dsack",
499 .data = &sysctl_tcp_dsack,
500 .maxlen = sizeof(int),
502 .proc_handler = proc_dointvec
505 .procname = "tcp_mem",
506 .maxlen = sizeof(sysctl_tcp_mem),
507 .data = &sysctl_tcp_mem,
509 .proc_handler = proc_doulongvec_minmax,
512 .procname = "tcp_wmem",
513 .data = &sysctl_tcp_wmem,
514 .maxlen = sizeof(sysctl_tcp_wmem),
516 .proc_handler = proc_dointvec_minmax,
520 .procname = "tcp_notsent_lowat",
521 .data = &sysctl_tcp_notsent_lowat,
522 .maxlen = sizeof(sysctl_tcp_notsent_lowat),
524 .proc_handler = proc_dointvec,
527 .procname = "tcp_rmem",
528 .data = &sysctl_tcp_rmem,
529 .maxlen = sizeof(sysctl_tcp_rmem),
531 .proc_handler = proc_dointvec_minmax,
535 .procname = "tcp_app_win",
536 .data = &sysctl_tcp_app_win,
537 .maxlen = sizeof(int),
539 .proc_handler = proc_dointvec
542 .procname = "tcp_adv_win_scale",
543 .data = &sysctl_tcp_adv_win_scale,
544 .maxlen = sizeof(int),
546 .proc_handler = proc_dointvec_minmax,
547 .extra1 = &tcp_adv_win_scale_min,
548 .extra2 = &tcp_adv_win_scale_max,
551 .procname = "tcp_tw_reuse",
552 .data = &sysctl_tcp_tw_reuse,
553 .maxlen = sizeof(int),
555 .proc_handler = proc_dointvec
558 .procname = "tcp_frto",
559 .data = &sysctl_tcp_frto,
560 .maxlen = sizeof(int),
562 .proc_handler = proc_dointvec
565 .procname = "tcp_min_rtt_wlen",
566 .data = &sysctl_tcp_min_rtt_wlen,
567 .maxlen = sizeof(int),
569 .proc_handler = proc_dointvec
572 .procname = "tcp_low_latency",
573 .data = &sysctl_tcp_low_latency,
574 .maxlen = sizeof(int),
576 .proc_handler = proc_dointvec
579 .procname = "tcp_no_metrics_save",
580 .data = &sysctl_tcp_nometrics_save,
581 .maxlen = sizeof(int),
583 .proc_handler = proc_dointvec,
586 .procname = "tcp_moderate_rcvbuf",
587 .data = &sysctl_tcp_moderate_rcvbuf,
588 .maxlen = sizeof(int),
590 .proc_handler = proc_dointvec,
593 .procname = "tcp_tso_win_divisor",
594 .data = &sysctl_tcp_tso_win_divisor,
595 .maxlen = sizeof(int),
597 .proc_handler = proc_dointvec,
600 .procname = "tcp_congestion_control",
602 .maxlen = TCP_CA_NAME_MAX,
603 .proc_handler = proc_tcp_congestion_control,
606 .procname = "tcp_workaround_signed_windows",
607 .data = &sysctl_tcp_workaround_signed_windows,
608 .maxlen = sizeof(int),
610 .proc_handler = proc_dointvec
613 .procname = "tcp_limit_output_bytes",
614 .data = &sysctl_tcp_limit_output_bytes,
615 .maxlen = sizeof(int),
617 .proc_handler = proc_dointvec
620 .procname = "tcp_challenge_ack_limit",
621 .data = &sysctl_tcp_challenge_ack_limit,
622 .maxlen = sizeof(int),
624 .proc_handler = proc_dointvec
627 .procname = "tcp_slow_start_after_idle",
628 .data = &sysctl_tcp_slow_start_after_idle,
629 .maxlen = sizeof(int),
631 .proc_handler = proc_dointvec
633 #ifdef CONFIG_NETLABEL
635 .procname = "cipso_cache_enable",
636 .data = &cipso_v4_cache_enabled,
637 .maxlen = sizeof(int),
639 .proc_handler = proc_dointvec,
642 .procname = "cipso_cache_bucket_size",
643 .data = &cipso_v4_cache_bucketsize,
644 .maxlen = sizeof(int),
646 .proc_handler = proc_dointvec,
649 .procname = "cipso_rbm_optfmt",
650 .data = &cipso_v4_rbm_optfmt,
651 .maxlen = sizeof(int),
653 .proc_handler = proc_dointvec,
656 .procname = "cipso_rbm_strictvalid",
657 .data = &cipso_v4_rbm_strictvalid,
658 .maxlen = sizeof(int),
660 .proc_handler = proc_dointvec,
662 #endif /* CONFIG_NETLABEL */
664 .procname = "tcp_available_congestion_control",
665 .maxlen = TCP_CA_BUF_MAX,
667 .proc_handler = proc_tcp_available_congestion_control,
670 .procname = "tcp_allowed_congestion_control",
671 .maxlen = TCP_CA_BUF_MAX,
673 .proc_handler = proc_allowed_congestion_control,
676 .procname = "tcp_thin_linear_timeouts",
677 .data = &sysctl_tcp_thin_linear_timeouts,
678 .maxlen = sizeof(int),
680 .proc_handler = proc_dointvec
683 .procname = "tcp_thin_dupack",
684 .data = &sysctl_tcp_thin_dupack,
685 .maxlen = sizeof(int),
687 .proc_handler = proc_dointvec
690 .procname = "tcp_early_retrans",
691 .data = &sysctl_tcp_early_retrans,
692 .maxlen = sizeof(int),
694 .proc_handler = proc_dointvec_minmax,
699 .procname = "tcp_min_tso_segs",
700 .data = &sysctl_tcp_min_tso_segs,
701 .maxlen = sizeof(int),
703 .proc_handler = proc_dointvec_minmax,
705 .extra2 = &gso_max_segs,
708 .procname = "tcp_pacing_ss_ratio",
709 .data = &sysctl_tcp_pacing_ss_ratio,
710 .maxlen = sizeof(int),
712 .proc_handler = proc_dointvec_minmax,
717 .procname = "tcp_pacing_ca_ratio",
718 .data = &sysctl_tcp_pacing_ca_ratio,
719 .maxlen = sizeof(int),
721 .proc_handler = proc_dointvec_minmax,
726 .procname = "tcp_autocorking",
727 .data = &sysctl_tcp_autocorking,
728 .maxlen = sizeof(int),
730 .proc_handler = proc_dointvec_minmax,
735 .procname = "tcp_invalid_ratelimit",
736 .data = &sysctl_tcp_invalid_ratelimit,
737 .maxlen = sizeof(int),
739 .proc_handler = proc_dointvec_ms_jiffies,
742 .procname = "icmp_msgs_per_sec",
743 .data = &sysctl_icmp_msgs_per_sec,
744 .maxlen = sizeof(int),
746 .proc_handler = proc_dointvec_minmax,
750 .procname = "icmp_msgs_burst",
751 .data = &sysctl_icmp_msgs_burst,
752 .maxlen = sizeof(int),
754 .proc_handler = proc_dointvec_minmax,
758 .procname = "udp_mem",
759 .data = &sysctl_udp_mem,
760 .maxlen = sizeof(sysctl_udp_mem),
762 .proc_handler = proc_doulongvec_minmax,
765 .procname = "udp_rmem_min",
766 .data = &sysctl_udp_rmem_min,
767 .maxlen = sizeof(sysctl_udp_rmem_min),
769 .proc_handler = proc_dointvec_minmax,
773 .procname = "udp_wmem_min",
774 .data = &sysctl_udp_wmem_min,
775 .maxlen = sizeof(sysctl_udp_wmem_min),
777 .proc_handler = proc_dointvec_minmax,
783 static struct ctl_table ipv4_net_table[] = {
785 .procname = "icmp_echo_ignore_all",
786 .data = &init_net.ipv4.sysctl_icmp_echo_ignore_all,
787 .maxlen = sizeof(int),
789 .proc_handler = proc_dointvec
792 .procname = "icmp_echo_ignore_broadcasts",
793 .data = &init_net.ipv4.sysctl_icmp_echo_ignore_broadcasts,
794 .maxlen = sizeof(int),
796 .proc_handler = proc_dointvec
799 .procname = "icmp_ignore_bogus_error_responses",
800 .data = &init_net.ipv4.sysctl_icmp_ignore_bogus_error_responses,
801 .maxlen = sizeof(int),
803 .proc_handler = proc_dointvec
806 .procname = "icmp_errors_use_inbound_ifaddr",
807 .data = &init_net.ipv4.sysctl_icmp_errors_use_inbound_ifaddr,
808 .maxlen = sizeof(int),
810 .proc_handler = proc_dointvec
813 .procname = "icmp_ratelimit",
814 .data = &init_net.ipv4.sysctl_icmp_ratelimit,
815 .maxlen = sizeof(int),
817 .proc_handler = proc_dointvec_ms_jiffies,
820 .procname = "icmp_ratemask",
821 .data = &init_net.ipv4.sysctl_icmp_ratemask,
822 .maxlen = sizeof(int),
824 .proc_handler = proc_dointvec
827 .procname = "ping_group_range",
828 .data = &init_net.ipv4.ping_group_range.range,
829 .maxlen = sizeof(gid_t)*2,
831 .proc_handler = ipv4_ping_group_range,
834 .procname = "tcp_ecn",
835 .data = &init_net.ipv4.sysctl_tcp_ecn,
836 .maxlen = sizeof(int),
838 .proc_handler = proc_dointvec
841 .procname = "tcp_ecn_fallback",
842 .data = &init_net.ipv4.sysctl_tcp_ecn_fallback,
843 .maxlen = sizeof(int),
845 .proc_handler = proc_dointvec
848 .procname = "ip_local_port_range",
849 .maxlen = sizeof(init_net.ipv4.ip_local_ports.range),
850 .data = &init_net.ipv4.ip_local_ports.range,
852 .proc_handler = ipv4_local_port_range,
855 .procname = "ip_local_reserved_ports",
856 .data = &init_net.ipv4.sysctl_local_reserved_ports,
859 .proc_handler = proc_do_large_bitmap,
862 .procname = "ip_no_pmtu_disc",
863 .data = &init_net.ipv4.sysctl_ip_no_pmtu_disc,
864 .maxlen = sizeof(int),
866 .proc_handler = proc_dointvec
869 .procname = "ip_forward_use_pmtu",
870 .data = &init_net.ipv4.sysctl_ip_fwd_use_pmtu,
871 .maxlen = sizeof(int),
873 .proc_handler = proc_dointvec,
876 .procname = "ip_nonlocal_bind",
877 .data = &init_net.ipv4.sysctl_ip_nonlocal_bind,
878 .maxlen = sizeof(int),
880 .proc_handler = proc_dointvec
883 .procname = "fwmark_reflect",
884 .data = &init_net.ipv4.sysctl_fwmark_reflect,
885 .maxlen = sizeof(int),
887 .proc_handler = proc_dointvec,
890 .procname = "tcp_fwmark_accept",
891 .data = &init_net.ipv4.sysctl_tcp_fwmark_accept,
892 .maxlen = sizeof(int),
894 .proc_handler = proc_dointvec,
896 #ifdef CONFIG_NET_L3_MASTER_DEV
898 .procname = "tcp_l3mdev_accept",
899 .data = &init_net.ipv4.sysctl_tcp_l3mdev_accept,
900 .maxlen = sizeof(int),
902 .proc_handler = proc_dointvec_minmax,
908 .procname = "tcp_mtu_probing",
909 .data = &init_net.ipv4.sysctl_tcp_mtu_probing,
910 .maxlen = sizeof(int),
912 .proc_handler = proc_dointvec,
915 .procname = "tcp_base_mss",
916 .data = &init_net.ipv4.sysctl_tcp_base_mss,
917 .maxlen = sizeof(int),
919 .proc_handler = proc_dointvec,
922 .procname = "tcp_probe_threshold",
923 .data = &init_net.ipv4.sysctl_tcp_probe_threshold,
924 .maxlen = sizeof(int),
926 .proc_handler = proc_dointvec,
929 .procname = "tcp_probe_interval",
930 .data = &init_net.ipv4.sysctl_tcp_probe_interval,
931 .maxlen = sizeof(int),
933 .proc_handler = proc_dointvec,
936 .procname = "igmp_link_local_mcast_reports",
937 .data = &sysctl_igmp_llm_reports,
938 .maxlen = sizeof(int),
940 .proc_handler = proc_dointvec
943 .procname = "tcp_keepalive_time",
944 .data = &init_net.ipv4.sysctl_tcp_keepalive_time,
945 .maxlen = sizeof(int),
947 .proc_handler = proc_dointvec_jiffies,
950 .procname = "tcp_keepalive_probes",
951 .data = &init_net.ipv4.sysctl_tcp_keepalive_probes,
952 .maxlen = sizeof(int),
954 .proc_handler = proc_dointvec
957 .procname = "tcp_keepalive_intvl",
958 .data = &init_net.ipv4.sysctl_tcp_keepalive_intvl,
959 .maxlen = sizeof(int),
961 .proc_handler = proc_dointvec_jiffies,
966 static __net_init int ipv4_sysctl_init_net(struct net *net)
968 struct ctl_table *table;
970 table = ipv4_net_table;
971 if (!net_eq(net, &init_net)) {
974 table = kmemdup(table, sizeof(ipv4_net_table), GFP_KERNEL);
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;
983 net->ipv4.ipv4_hdr = register_net_sysctl(net, "net/ipv4", table);
984 if (!net->ipv4.ipv4_hdr)
987 net->ipv4.sysctl_local_reserved_ports = kzalloc(65536 / 8, GFP_KERNEL);
988 if (!net->ipv4.sysctl_local_reserved_ports)
994 unregister_net_sysctl_table(net->ipv4.ipv4_hdr);
996 if (!net_eq(net, &init_net))
1002 static __net_exit void ipv4_sysctl_exit_net(struct net *net)
1004 struct ctl_table *table;
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);
1012 static __net_initdata struct pernet_operations ipv4_sysctl_ops = {
1013 .init = ipv4_sysctl_init_net,
1014 .exit = ipv4_sysctl_exit_net,
1017 static __init int sysctl_ipv4_init(void)
1019 struct ctl_table_header *hdr;
1021 hdr = register_net_sysctl(&init_net, "net/ipv4", ipv4_table);
1025 if (register_pernet_subsys(&ipv4_sysctl_ops)) {
1026 unregister_net_sysctl_table(hdr);
1033 __initcall(sysctl_ipv4_init);