1 // SPDX-License-Identifier: GPL-2.0
3 * sysctl_net_ipv4.c: sysctl interface to net IPV4 subsystem.
5 * Begun April 1, 1996, Mike Shaver.
6 * Added /proc/sys/net/ipv4 directory entry (empty =) ). [MS]
10 #include <linux/module.h>
11 #include <linux/sysctl.h>
12 #include <linux/igmp.h>
13 #include <linux/inetdevice.h>
14 #include <linux/seqlock.h>
15 #include <linux/init.h>
16 #include <linux/slab.h>
17 #include <linux/nsproxy.h>
18 #include <linux/swap.h>
22 #include <net/route.h>
25 #include <net/cipso_ipv4.h>
26 #include <net/inet_frag.h>
28 #include <net/protocol.h>
33 static int thousand = 1000;
34 static int gso_max_segs = GSO_MAX_SEGS;
35 static int tcp_retr1_max = 255;
36 static int ip_local_port_range_min[] = { 1, 1 };
37 static int ip_local_port_range_max[] = { 65535, 65535 };
38 static int tcp_adv_win_scale_min = -31;
39 static int tcp_adv_win_scale_max = 31;
40 static int ip_privileged_port_min;
41 static int ip_privileged_port_max = 65535;
42 static int ip_ttl_min = 1;
43 static int ip_ttl_max = 255;
44 static int tcp_syn_retries_min = 1;
45 static int tcp_syn_retries_max = MAX_TCP_SYNCNT;
46 static int ip_ping_group_range_min[] = { 0, 0 };
47 static int ip_ping_group_range_max[] = { GID_T_MAX, GID_T_MAX };
50 static int sysctl_tcp_low_latency __read_mostly;
52 /* Update system visible IP port range */
53 static void set_local_port_range(struct net *net, int range[2])
55 bool same_parity = !((range[0] ^ range[1]) & 1);
57 write_seqlock_bh(&net->ipv4.ip_local_ports.lock);
58 if (same_parity && !net->ipv4.ip_local_ports.warned) {
59 net->ipv4.ip_local_ports.warned = true;
60 pr_err_ratelimited("ip_local_port_range: prefer different parity for start/end values.\n");
62 net->ipv4.ip_local_ports.range[0] = range[0];
63 net->ipv4.ip_local_ports.range[1] = range[1];
64 write_sequnlock_bh(&net->ipv4.ip_local_ports.lock);
67 /* Validate changes from /proc interface. */
68 static int ipv4_local_port_range(struct ctl_table *table, int write,
70 size_t *lenp, loff_t *ppos)
73 container_of(table->data, struct net, ipv4.ip_local_ports.range);
76 struct ctl_table tmp = {
78 .maxlen = sizeof(range),
80 .extra1 = &ip_local_port_range_min,
81 .extra2 = &ip_local_port_range_max,
84 inet_get_local_port_range(net, &range[0], &range[1]);
86 ret = proc_dointvec_minmax(&tmp, write, buffer, lenp, ppos);
88 if (write && ret == 0) {
89 /* Ensure that the upper limit is not smaller than the lower,
90 * and that the lower does not encroach upon the privileged
93 if ((range[1] < range[0]) ||
94 (range[0] < net->ipv4.sysctl_ip_prot_sock))
97 set_local_port_range(net, range);
103 /* Validate changes from /proc interface. */
104 static int ipv4_privileged_ports(struct ctl_table *table, int write,
105 void __user *buffer, size_t *lenp, loff_t *ppos)
107 struct net *net = container_of(table->data, struct net,
108 ipv4.sysctl_ip_prot_sock);
112 struct ctl_table tmp = {
114 .maxlen = sizeof(pports),
116 .extra1 = &ip_privileged_port_min,
117 .extra2 = &ip_privileged_port_max,
120 pports = net->ipv4.sysctl_ip_prot_sock;
122 ret = proc_dointvec_minmax(&tmp, write, buffer, lenp, ppos);
124 if (write && ret == 0) {
125 inet_get_local_port_range(net, &range[0], &range[1]);
126 /* Ensure that the local port range doesn't overlap with the
127 * privileged port range.
129 if (range[0] < pports)
132 net->ipv4.sysctl_ip_prot_sock = pports;
138 static void inet_get_ping_group_range_table(struct ctl_table *table, kgid_t *low, kgid_t *high)
140 kgid_t *data = table->data;
142 container_of(table->data, struct net, ipv4.ping_group_range.range);
145 seq = read_seqbegin(&net->ipv4.ping_group_range.lock);
149 } while (read_seqretry(&net->ipv4.ping_group_range.lock, seq));
152 /* Update system visible IP port range */
153 static void set_ping_group_range(struct ctl_table *table, kgid_t low, kgid_t high)
155 kgid_t *data = table->data;
157 container_of(table->data, struct net, ipv4.ping_group_range.range);
158 write_seqlock(&net->ipv4.ping_group_range.lock);
161 write_sequnlock(&net->ipv4.ping_group_range.lock);
164 /* Validate changes from /proc interface. */
165 static int ipv4_ping_group_range(struct ctl_table *table, int write,
167 size_t *lenp, loff_t *ppos)
169 struct user_namespace *user_ns = current_user_ns();
173 struct ctl_table tmp = {
175 .maxlen = sizeof(urange),
177 .extra1 = &ip_ping_group_range_min,
178 .extra2 = &ip_ping_group_range_max,
181 inet_get_ping_group_range_table(table, &low, &high);
182 urange[0] = from_kgid_munged(user_ns, low);
183 urange[1] = from_kgid_munged(user_ns, high);
184 ret = proc_dointvec_minmax(&tmp, write, buffer, lenp, ppos);
186 if (write && ret == 0) {
187 low = make_kgid(user_ns, urange[0]);
188 high = make_kgid(user_ns, urange[1]);
189 if (!gid_valid(low) || !gid_valid(high) ||
190 (urange[1] < urange[0]) || gid_lt(high, low)) {
191 low = make_kgid(&init_user_ns, 1);
192 high = make_kgid(&init_user_ns, 0);
194 set_ping_group_range(table, low, high);
200 static int proc_tcp_congestion_control(struct ctl_table *ctl, int write,
201 void __user *buffer, size_t *lenp, loff_t *ppos)
203 char val[TCP_CA_NAME_MAX];
204 struct ctl_table tbl = {
206 .maxlen = TCP_CA_NAME_MAX,
210 tcp_get_default_congestion_control(val);
212 ret = proc_dostring(&tbl, write, buffer, lenp, ppos);
213 if (write && ret == 0)
214 ret = tcp_set_default_congestion_control(val);
218 static int proc_tcp_available_congestion_control(struct ctl_table *ctl,
220 void __user *buffer, size_t *lenp,
223 struct ctl_table tbl = { .maxlen = TCP_CA_BUF_MAX, };
226 tbl.data = kmalloc(tbl.maxlen, GFP_USER);
229 tcp_get_available_congestion_control(tbl.data, TCP_CA_BUF_MAX);
230 ret = proc_dostring(&tbl, write, buffer, lenp, ppos);
235 static int proc_allowed_congestion_control(struct ctl_table *ctl,
237 void __user *buffer, size_t *lenp,
240 struct ctl_table tbl = { .maxlen = TCP_CA_BUF_MAX };
243 tbl.data = kmalloc(tbl.maxlen, GFP_USER);
247 tcp_get_allowed_congestion_control(tbl.data, tbl.maxlen);
248 ret = proc_dostring(&tbl, write, buffer, lenp, ppos);
249 if (write && ret == 0)
250 ret = tcp_set_allowed_congestion_control(tbl.data);
255 static int proc_tcp_fastopen_key(struct ctl_table *ctl, int write,
256 void __user *buffer, size_t *lenp,
259 struct ctl_table tbl = { .maxlen = (TCP_FASTOPEN_KEY_LENGTH * 2 + 10) };
260 struct tcp_fastopen_context *ctxt;
262 u32 user_key[4]; /* 16 bytes, matching TCP_FASTOPEN_KEY_LENGTH */
264 tbl.data = kmalloc(tbl.maxlen, GFP_KERNEL);
269 ctxt = rcu_dereference(tcp_fastopen_ctx);
271 memcpy(user_key, ctxt->key, TCP_FASTOPEN_KEY_LENGTH);
273 memset(user_key, 0, sizeof(user_key));
276 snprintf(tbl.data, tbl.maxlen, "%08x-%08x-%08x-%08x",
277 user_key[0], user_key[1], user_key[2], user_key[3]);
278 ret = proc_dostring(&tbl, write, buffer, lenp, ppos);
280 if (write && ret == 0) {
281 if (sscanf(tbl.data, "%x-%x-%x-%x", user_key, user_key + 1,
282 user_key + 2, user_key + 3) != 4) {
286 /* Generate a dummy secret but don't publish it. This
287 * is needed so we don't regenerate a new key on the
288 * first invocation of tcp_fastopen_cookie_gen
290 tcp_fastopen_init_key_once(false);
291 tcp_fastopen_reset_cipher(user_key, TCP_FASTOPEN_KEY_LENGTH);
295 pr_debug("proc FO key set 0x%x-%x-%x-%x <- 0x%s: %u\n",
296 user_key[0], user_key[1], user_key[2], user_key[3],
297 (char *)tbl.data, ret);
302 static void proc_configure_early_demux(int enabled, int protocol)
304 struct net_protocol *ipprot;
305 #if IS_ENABLED(CONFIG_IPV6)
306 struct inet6_protocol *ip6prot;
311 ipprot = rcu_dereference(inet_protos[protocol]);
313 ipprot->early_demux = enabled ? ipprot->early_demux_handler :
316 #if IS_ENABLED(CONFIG_IPV6)
317 ip6prot = rcu_dereference(inet6_protos[protocol]);
319 ip6prot->early_demux = enabled ? ip6prot->early_demux_handler :
325 static int proc_tcp_early_demux(struct ctl_table *table, int write,
326 void __user *buffer, size_t *lenp, loff_t *ppos)
330 ret = proc_dointvec(table, write, buffer, lenp, ppos);
333 int enabled = init_net.ipv4.sysctl_tcp_early_demux;
335 proc_configure_early_demux(enabled, IPPROTO_TCP);
341 static int proc_udp_early_demux(struct ctl_table *table, int write,
342 void __user *buffer, size_t *lenp, loff_t *ppos)
346 ret = proc_dointvec(table, write, buffer, lenp, ppos);
349 int enabled = init_net.ipv4.sysctl_udp_early_demux;
351 proc_configure_early_demux(enabled, IPPROTO_UDP);
357 static int proc_tfo_blackhole_detect_timeout(struct ctl_table *table,
360 size_t *lenp, loff_t *ppos)
364 ret = proc_dointvec_minmax(table, write, buffer, lenp, ppos);
365 if (write && ret == 0)
366 tcp_fastopen_active_timeout_reset();
371 static int proc_tcp_available_ulp(struct ctl_table *ctl,
373 void __user *buffer, size_t *lenp,
376 struct ctl_table tbl = { .maxlen = TCP_ULP_BUF_MAX, };
379 tbl.data = kmalloc(tbl.maxlen, GFP_USER);
382 tcp_get_available_ulp(tbl.data, TCP_ULP_BUF_MAX);
383 ret = proc_dostring(&tbl, write, buffer, lenp, ppos);
389 static struct ctl_table ipv4_table[] = {
391 .procname = "tcp_retrans_collapse",
392 .data = &sysctl_tcp_retrans_collapse,
393 .maxlen = sizeof(int),
395 .proc_handler = proc_dointvec
398 .procname = "tcp_max_orphans",
399 .data = &sysctl_tcp_max_orphans,
400 .maxlen = sizeof(int),
402 .proc_handler = proc_dointvec
405 .procname = "tcp_fastopen",
406 .data = &sysctl_tcp_fastopen,
407 .maxlen = sizeof(int),
409 .proc_handler = proc_dointvec,
412 .procname = "tcp_fastopen_key",
414 .maxlen = ((TCP_FASTOPEN_KEY_LENGTH * 2) + 10),
415 .proc_handler = proc_tcp_fastopen_key,
418 .procname = "tcp_fastopen_blackhole_timeout_sec",
419 .data = &sysctl_tcp_fastopen_blackhole_timeout,
420 .maxlen = sizeof(int),
422 .proc_handler = proc_tfo_blackhole_detect_timeout,
426 .procname = "tcp_abort_on_overflow",
427 .data = &sysctl_tcp_abort_on_overflow,
428 .maxlen = sizeof(int),
430 .proc_handler = proc_dointvec
433 .procname = "tcp_stdurg",
434 .data = &sysctl_tcp_stdurg,
435 .maxlen = sizeof(int),
437 .proc_handler = proc_dointvec
440 .procname = "tcp_rfc1337",
441 .data = &sysctl_tcp_rfc1337,
442 .maxlen = sizeof(int),
444 .proc_handler = proc_dointvec
447 .procname = "inet_peer_threshold",
448 .data = &inet_peer_threshold,
449 .maxlen = sizeof(int),
451 .proc_handler = proc_dointvec
454 .procname = "inet_peer_minttl",
455 .data = &inet_peer_minttl,
456 .maxlen = sizeof(int),
458 .proc_handler = proc_dointvec_jiffies,
461 .procname = "inet_peer_maxttl",
462 .data = &inet_peer_maxttl,
463 .maxlen = sizeof(int),
465 .proc_handler = proc_dointvec_jiffies,
468 .procname = "tcp_fack",
469 .data = &sysctl_tcp_fack,
470 .maxlen = sizeof(int),
472 .proc_handler = proc_dointvec
475 .procname = "tcp_recovery",
476 .data = &sysctl_tcp_recovery,
477 .maxlen = sizeof(int),
479 .proc_handler = proc_dointvec,
482 .procname = "tcp_max_reordering",
483 .data = &sysctl_tcp_max_reordering,
484 .maxlen = sizeof(int),
486 .proc_handler = proc_dointvec
489 .procname = "tcp_dsack",
490 .data = &sysctl_tcp_dsack,
491 .maxlen = sizeof(int),
493 .proc_handler = proc_dointvec
496 .procname = "tcp_mem",
497 .maxlen = sizeof(sysctl_tcp_mem),
498 .data = &sysctl_tcp_mem,
500 .proc_handler = proc_doulongvec_minmax,
503 .procname = "tcp_wmem",
504 .data = &sysctl_tcp_wmem,
505 .maxlen = sizeof(sysctl_tcp_wmem),
507 .proc_handler = proc_dointvec_minmax,
511 .procname = "tcp_rmem",
512 .data = &sysctl_tcp_rmem,
513 .maxlen = sizeof(sysctl_tcp_rmem),
515 .proc_handler = proc_dointvec_minmax,
519 .procname = "tcp_app_win",
520 .data = &sysctl_tcp_app_win,
521 .maxlen = sizeof(int),
523 .proc_handler = proc_dointvec
526 .procname = "tcp_adv_win_scale",
527 .data = &sysctl_tcp_adv_win_scale,
528 .maxlen = sizeof(int),
530 .proc_handler = proc_dointvec_minmax,
531 .extra1 = &tcp_adv_win_scale_min,
532 .extra2 = &tcp_adv_win_scale_max,
535 .procname = "tcp_frto",
536 .data = &sysctl_tcp_frto,
537 .maxlen = sizeof(int),
539 .proc_handler = proc_dointvec
542 .procname = "tcp_min_rtt_wlen",
543 .data = &sysctl_tcp_min_rtt_wlen,
544 .maxlen = sizeof(int),
546 .proc_handler = proc_dointvec
549 .procname = "tcp_low_latency",
550 .data = &sysctl_tcp_low_latency,
551 .maxlen = sizeof(int),
553 .proc_handler = proc_dointvec
556 .procname = "tcp_no_metrics_save",
557 .data = &sysctl_tcp_nometrics_save,
558 .maxlen = sizeof(int),
560 .proc_handler = proc_dointvec,
563 .procname = "tcp_moderate_rcvbuf",
564 .data = &sysctl_tcp_moderate_rcvbuf,
565 .maxlen = sizeof(int),
567 .proc_handler = proc_dointvec,
570 .procname = "tcp_tso_win_divisor",
571 .data = &sysctl_tcp_tso_win_divisor,
572 .maxlen = sizeof(int),
574 .proc_handler = proc_dointvec,
577 .procname = "tcp_congestion_control",
579 .maxlen = TCP_CA_NAME_MAX,
580 .proc_handler = proc_tcp_congestion_control,
583 .procname = "tcp_workaround_signed_windows",
584 .data = &sysctl_tcp_workaround_signed_windows,
585 .maxlen = sizeof(int),
587 .proc_handler = proc_dointvec
590 .procname = "tcp_limit_output_bytes",
591 .data = &sysctl_tcp_limit_output_bytes,
592 .maxlen = sizeof(int),
594 .proc_handler = proc_dointvec
597 .procname = "tcp_challenge_ack_limit",
598 .data = &sysctl_tcp_challenge_ack_limit,
599 .maxlen = sizeof(int),
601 .proc_handler = proc_dointvec
604 .procname = "tcp_slow_start_after_idle",
605 .data = &sysctl_tcp_slow_start_after_idle,
606 .maxlen = sizeof(int),
608 .proc_handler = proc_dointvec
610 #ifdef CONFIG_NETLABEL
612 .procname = "cipso_cache_enable",
613 .data = &cipso_v4_cache_enabled,
614 .maxlen = sizeof(int),
616 .proc_handler = proc_dointvec,
619 .procname = "cipso_cache_bucket_size",
620 .data = &cipso_v4_cache_bucketsize,
621 .maxlen = sizeof(int),
623 .proc_handler = proc_dointvec,
626 .procname = "cipso_rbm_optfmt",
627 .data = &cipso_v4_rbm_optfmt,
628 .maxlen = sizeof(int),
630 .proc_handler = proc_dointvec,
633 .procname = "cipso_rbm_strictvalid",
634 .data = &cipso_v4_rbm_strictvalid,
635 .maxlen = sizeof(int),
637 .proc_handler = proc_dointvec,
639 #endif /* CONFIG_NETLABEL */
641 .procname = "tcp_available_congestion_control",
642 .maxlen = TCP_CA_BUF_MAX,
644 .proc_handler = proc_tcp_available_congestion_control,
647 .procname = "tcp_allowed_congestion_control",
648 .maxlen = TCP_CA_BUF_MAX,
650 .proc_handler = proc_allowed_congestion_control,
653 .procname = "tcp_thin_linear_timeouts",
654 .data = &sysctl_tcp_thin_linear_timeouts,
655 .maxlen = sizeof(int),
657 .proc_handler = proc_dointvec
660 .procname = "tcp_early_retrans",
661 .data = &sysctl_tcp_early_retrans,
662 .maxlen = sizeof(int),
664 .proc_handler = proc_dointvec_minmax,
669 .procname = "tcp_min_tso_segs",
670 .data = &sysctl_tcp_min_tso_segs,
671 .maxlen = sizeof(int),
673 .proc_handler = proc_dointvec_minmax,
675 .extra2 = &gso_max_segs,
678 .procname = "tcp_pacing_ss_ratio",
679 .data = &sysctl_tcp_pacing_ss_ratio,
680 .maxlen = sizeof(int),
682 .proc_handler = proc_dointvec_minmax,
687 .procname = "tcp_pacing_ca_ratio",
688 .data = &sysctl_tcp_pacing_ca_ratio,
689 .maxlen = sizeof(int),
691 .proc_handler = proc_dointvec_minmax,
696 .procname = "tcp_autocorking",
697 .data = &sysctl_tcp_autocorking,
698 .maxlen = sizeof(int),
700 .proc_handler = proc_dointvec_minmax,
705 .procname = "tcp_invalid_ratelimit",
706 .data = &sysctl_tcp_invalid_ratelimit,
707 .maxlen = sizeof(int),
709 .proc_handler = proc_dointvec_ms_jiffies,
712 .procname = "tcp_available_ulp",
713 .maxlen = TCP_ULP_BUF_MAX,
715 .proc_handler = proc_tcp_available_ulp,
718 .procname = "icmp_msgs_per_sec",
719 .data = &sysctl_icmp_msgs_per_sec,
720 .maxlen = sizeof(int),
722 .proc_handler = proc_dointvec_minmax,
726 .procname = "icmp_msgs_burst",
727 .data = &sysctl_icmp_msgs_burst,
728 .maxlen = sizeof(int),
730 .proc_handler = proc_dointvec_minmax,
734 .procname = "udp_mem",
735 .data = &sysctl_udp_mem,
736 .maxlen = sizeof(sysctl_udp_mem),
738 .proc_handler = proc_doulongvec_minmax,
741 .procname = "udp_rmem_min",
742 .data = &sysctl_udp_rmem_min,
743 .maxlen = sizeof(sysctl_udp_rmem_min),
745 .proc_handler = proc_dointvec_minmax,
749 .procname = "udp_wmem_min",
750 .data = &sysctl_udp_wmem_min,
751 .maxlen = sizeof(sysctl_udp_wmem_min),
753 .proc_handler = proc_dointvec_minmax,
759 static struct ctl_table ipv4_net_table[] = {
761 .procname = "icmp_echo_ignore_all",
762 .data = &init_net.ipv4.sysctl_icmp_echo_ignore_all,
763 .maxlen = sizeof(int),
765 .proc_handler = proc_dointvec
768 .procname = "icmp_echo_ignore_broadcasts",
769 .data = &init_net.ipv4.sysctl_icmp_echo_ignore_broadcasts,
770 .maxlen = sizeof(int),
772 .proc_handler = proc_dointvec
775 .procname = "icmp_ignore_bogus_error_responses",
776 .data = &init_net.ipv4.sysctl_icmp_ignore_bogus_error_responses,
777 .maxlen = sizeof(int),
779 .proc_handler = proc_dointvec
782 .procname = "icmp_errors_use_inbound_ifaddr",
783 .data = &init_net.ipv4.sysctl_icmp_errors_use_inbound_ifaddr,
784 .maxlen = sizeof(int),
786 .proc_handler = proc_dointvec
789 .procname = "icmp_ratelimit",
790 .data = &init_net.ipv4.sysctl_icmp_ratelimit,
791 .maxlen = sizeof(int),
793 .proc_handler = proc_dointvec_ms_jiffies,
796 .procname = "icmp_ratemask",
797 .data = &init_net.ipv4.sysctl_icmp_ratemask,
798 .maxlen = sizeof(int),
800 .proc_handler = proc_dointvec
803 .procname = "ping_group_range",
804 .data = &init_net.ipv4.ping_group_range.range,
805 .maxlen = sizeof(gid_t)*2,
807 .proc_handler = ipv4_ping_group_range,
810 .procname = "tcp_ecn",
811 .data = &init_net.ipv4.sysctl_tcp_ecn,
812 .maxlen = sizeof(int),
814 .proc_handler = proc_dointvec
817 .procname = "tcp_ecn_fallback",
818 .data = &init_net.ipv4.sysctl_tcp_ecn_fallback,
819 .maxlen = sizeof(int),
821 .proc_handler = proc_dointvec
824 .procname = "ip_dynaddr",
825 .data = &init_net.ipv4.sysctl_ip_dynaddr,
826 .maxlen = sizeof(int),
828 .proc_handler = proc_dointvec
831 .procname = "ip_early_demux",
832 .data = &init_net.ipv4.sysctl_ip_early_demux,
833 .maxlen = sizeof(int),
835 .proc_handler = proc_dointvec
838 .procname = "udp_early_demux",
839 .data = &init_net.ipv4.sysctl_udp_early_demux,
840 .maxlen = sizeof(int),
842 .proc_handler = proc_udp_early_demux
845 .procname = "tcp_early_demux",
846 .data = &init_net.ipv4.sysctl_tcp_early_demux,
847 .maxlen = sizeof(int),
849 .proc_handler = proc_tcp_early_demux
852 .procname = "ip_default_ttl",
853 .data = &init_net.ipv4.sysctl_ip_default_ttl,
854 .maxlen = sizeof(int),
856 .proc_handler = proc_dointvec_minmax,
857 .extra1 = &ip_ttl_min,
858 .extra2 = &ip_ttl_max,
861 .procname = "ip_local_port_range",
862 .maxlen = sizeof(init_net.ipv4.ip_local_ports.range),
863 .data = &init_net.ipv4.ip_local_ports.range,
865 .proc_handler = ipv4_local_port_range,
868 .procname = "ip_local_reserved_ports",
869 .data = &init_net.ipv4.sysctl_local_reserved_ports,
872 .proc_handler = proc_do_large_bitmap,
875 .procname = "ip_no_pmtu_disc",
876 .data = &init_net.ipv4.sysctl_ip_no_pmtu_disc,
877 .maxlen = sizeof(int),
879 .proc_handler = proc_dointvec
882 .procname = "ip_forward_use_pmtu",
883 .data = &init_net.ipv4.sysctl_ip_fwd_use_pmtu,
884 .maxlen = sizeof(int),
886 .proc_handler = proc_dointvec,
889 .procname = "ip_nonlocal_bind",
890 .data = &init_net.ipv4.sysctl_ip_nonlocal_bind,
891 .maxlen = sizeof(int),
893 .proc_handler = proc_dointvec
896 .procname = "fwmark_reflect",
897 .data = &init_net.ipv4.sysctl_fwmark_reflect,
898 .maxlen = sizeof(int),
900 .proc_handler = proc_dointvec,
903 .procname = "tcp_fwmark_accept",
904 .data = &init_net.ipv4.sysctl_tcp_fwmark_accept,
905 .maxlen = sizeof(int),
907 .proc_handler = proc_dointvec,
909 #ifdef CONFIG_NET_L3_MASTER_DEV
911 .procname = "tcp_l3mdev_accept",
912 .data = &init_net.ipv4.sysctl_tcp_l3mdev_accept,
913 .maxlen = sizeof(int),
915 .proc_handler = proc_dointvec_minmax,
921 .procname = "tcp_mtu_probing",
922 .data = &init_net.ipv4.sysctl_tcp_mtu_probing,
923 .maxlen = sizeof(int),
925 .proc_handler = proc_dointvec,
928 .procname = "tcp_base_mss",
929 .data = &init_net.ipv4.sysctl_tcp_base_mss,
930 .maxlen = sizeof(int),
932 .proc_handler = proc_dointvec,
935 .procname = "tcp_probe_threshold",
936 .data = &init_net.ipv4.sysctl_tcp_probe_threshold,
937 .maxlen = sizeof(int),
939 .proc_handler = proc_dointvec,
942 .procname = "tcp_probe_interval",
943 .data = &init_net.ipv4.sysctl_tcp_probe_interval,
944 .maxlen = sizeof(int),
946 .proc_handler = proc_dointvec,
949 .procname = "igmp_link_local_mcast_reports",
950 .data = &init_net.ipv4.sysctl_igmp_llm_reports,
951 .maxlen = sizeof(int),
953 .proc_handler = proc_dointvec
956 .procname = "igmp_max_memberships",
957 .data = &init_net.ipv4.sysctl_igmp_max_memberships,
958 .maxlen = sizeof(int),
960 .proc_handler = proc_dointvec
963 .procname = "igmp_max_msf",
964 .data = &init_net.ipv4.sysctl_igmp_max_msf,
965 .maxlen = sizeof(int),
967 .proc_handler = proc_dointvec
969 #ifdef CONFIG_IP_MULTICAST
971 .procname = "igmp_qrv",
972 .data = &init_net.ipv4.sysctl_igmp_qrv,
973 .maxlen = sizeof(int),
975 .proc_handler = proc_dointvec_minmax,
980 .procname = "tcp_keepalive_time",
981 .data = &init_net.ipv4.sysctl_tcp_keepalive_time,
982 .maxlen = sizeof(int),
984 .proc_handler = proc_dointvec_jiffies,
987 .procname = "tcp_keepalive_probes",
988 .data = &init_net.ipv4.sysctl_tcp_keepalive_probes,
989 .maxlen = sizeof(int),
991 .proc_handler = proc_dointvec
994 .procname = "tcp_keepalive_intvl",
995 .data = &init_net.ipv4.sysctl_tcp_keepalive_intvl,
996 .maxlen = sizeof(int),
998 .proc_handler = proc_dointvec_jiffies,
1001 .procname = "tcp_syn_retries",
1002 .data = &init_net.ipv4.sysctl_tcp_syn_retries,
1003 .maxlen = sizeof(int),
1005 .proc_handler = proc_dointvec_minmax,
1006 .extra1 = &tcp_syn_retries_min,
1007 .extra2 = &tcp_syn_retries_max
1010 .procname = "tcp_synack_retries",
1011 .data = &init_net.ipv4.sysctl_tcp_synack_retries,
1012 .maxlen = sizeof(int),
1014 .proc_handler = proc_dointvec
1016 #ifdef CONFIG_SYN_COOKIES
1018 .procname = "tcp_syncookies",
1019 .data = &init_net.ipv4.sysctl_tcp_syncookies,
1020 .maxlen = sizeof(int),
1022 .proc_handler = proc_dointvec
1026 .procname = "tcp_reordering",
1027 .data = &init_net.ipv4.sysctl_tcp_reordering,
1028 .maxlen = sizeof(int),
1030 .proc_handler = proc_dointvec
1033 .procname = "tcp_retries1",
1034 .data = &init_net.ipv4.sysctl_tcp_retries1,
1035 .maxlen = sizeof(int),
1037 .proc_handler = proc_dointvec_minmax,
1038 .extra2 = &tcp_retr1_max
1041 .procname = "tcp_retries2",
1042 .data = &init_net.ipv4.sysctl_tcp_retries2,
1043 .maxlen = sizeof(int),
1045 .proc_handler = proc_dointvec
1048 .procname = "tcp_orphan_retries",
1049 .data = &init_net.ipv4.sysctl_tcp_orphan_retries,
1050 .maxlen = sizeof(int),
1052 .proc_handler = proc_dointvec
1055 .procname = "tcp_fin_timeout",
1056 .data = &init_net.ipv4.sysctl_tcp_fin_timeout,
1057 .maxlen = sizeof(int),
1059 .proc_handler = proc_dointvec_jiffies,
1062 .procname = "tcp_notsent_lowat",
1063 .data = &init_net.ipv4.sysctl_tcp_notsent_lowat,
1064 .maxlen = sizeof(unsigned int),
1066 .proc_handler = proc_douintvec,
1069 .procname = "tcp_tw_reuse",
1070 .data = &init_net.ipv4.sysctl_tcp_tw_reuse,
1071 .maxlen = sizeof(int),
1073 .proc_handler = proc_dointvec
1076 .procname = "tcp_max_tw_buckets",
1077 .data = &init_net.ipv4.tcp_death_row.sysctl_max_tw_buckets,
1078 .maxlen = sizeof(int),
1080 .proc_handler = proc_dointvec
1083 .procname = "tcp_max_syn_backlog",
1084 .data = &init_net.ipv4.sysctl_max_syn_backlog,
1085 .maxlen = sizeof(int),
1087 .proc_handler = proc_dointvec
1089 #ifdef CONFIG_IP_ROUTE_MULTIPATH
1091 .procname = "fib_multipath_use_neigh",
1092 .data = &init_net.ipv4.sysctl_fib_multipath_use_neigh,
1093 .maxlen = sizeof(int),
1095 .proc_handler = proc_dointvec_minmax,
1100 .procname = "fib_multipath_hash_policy",
1101 .data = &init_net.ipv4.sysctl_fib_multipath_hash_policy,
1102 .maxlen = sizeof(int),
1104 .proc_handler = proc_dointvec_minmax,
1110 .procname = "ip_unprivileged_port_start",
1111 .maxlen = sizeof(int),
1112 .data = &init_net.ipv4.sysctl_ip_prot_sock,
1114 .proc_handler = ipv4_privileged_ports,
1116 #ifdef CONFIG_NET_L3_MASTER_DEV
1118 .procname = "udp_l3mdev_accept",
1119 .data = &init_net.ipv4.sysctl_udp_l3mdev_accept,
1120 .maxlen = sizeof(int),
1122 .proc_handler = proc_dointvec_minmax,
1128 .procname = "tcp_sack",
1129 .data = &init_net.ipv4.sysctl_tcp_sack,
1130 .maxlen = sizeof(int),
1132 .proc_handler = proc_dointvec
1135 .procname = "tcp_window_scaling",
1136 .data = &init_net.ipv4.sysctl_tcp_window_scaling,
1137 .maxlen = sizeof(int),
1139 .proc_handler = proc_dointvec
1142 .procname = "tcp_timestamps",
1143 .data = &init_net.ipv4.sysctl_tcp_timestamps,
1144 .maxlen = sizeof(int),
1146 .proc_handler = proc_dointvec
1151 static __net_init int ipv4_sysctl_init_net(struct net *net)
1153 struct ctl_table *table;
1155 table = ipv4_net_table;
1156 if (!net_eq(net, &init_net)) {
1159 table = kmemdup(table, sizeof(ipv4_net_table), GFP_KERNEL);
1163 /* Update the variables to point into the current struct net */
1164 for (i = 0; i < ARRAY_SIZE(ipv4_net_table) - 1; i++)
1165 table[i].data += (void *)net - (void *)&init_net;
1168 net->ipv4.ipv4_hdr = register_net_sysctl(net, "net/ipv4", table);
1169 if (!net->ipv4.ipv4_hdr)
1172 net->ipv4.sysctl_local_reserved_ports = kzalloc(65536 / 8, GFP_KERNEL);
1173 if (!net->ipv4.sysctl_local_reserved_ports)
1179 unregister_net_sysctl_table(net->ipv4.ipv4_hdr);
1181 if (!net_eq(net, &init_net))
1187 static __net_exit void ipv4_sysctl_exit_net(struct net *net)
1189 struct ctl_table *table;
1191 kfree(net->ipv4.sysctl_local_reserved_ports);
1192 table = net->ipv4.ipv4_hdr->ctl_table_arg;
1193 unregister_net_sysctl_table(net->ipv4.ipv4_hdr);
1197 static __net_initdata struct pernet_operations ipv4_sysctl_ops = {
1198 .init = ipv4_sysctl_init_net,
1199 .exit = ipv4_sysctl_exit_net,
1202 static __init int sysctl_ipv4_init(void)
1204 struct ctl_table_header *hdr;
1206 hdr = register_net_sysctl(&init_net, "net/ipv4", ipv4_table);
1210 if (register_pernet_subsys(&ipv4_sysctl_ops)) {
1211 unregister_net_sysctl_table(hdr);
1218 __initcall(sysctl_ipv4_init);