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>
27 #include <net/protocol.h>
32 static int thousand = 1000;
33 static int gso_max_segs = GSO_MAX_SEGS;
34 static int tcp_retr1_max = 255;
35 static int ip_local_port_range_min[] = { 1, 1 };
36 static int ip_local_port_range_max[] = { 65535, 65535 };
37 static int tcp_adv_win_scale_min = -31;
38 static int tcp_adv_win_scale_max = 31;
39 static int ip_privileged_port_min;
40 static int ip_privileged_port_max = 65535;
41 static int ip_ttl_min = 1;
42 static int ip_ttl_max = 255;
43 static int tcp_syn_retries_min = 1;
44 static int tcp_syn_retries_max = MAX_TCP_SYNCNT;
45 static int ip_ping_group_range_min[] = { 0, 0 };
46 static int ip_ping_group_range_max[] = { GID_T_MAX, GID_T_MAX };
49 static int sysctl_tcp_low_latency __read_mostly;
51 /* Update system visible IP port range */
52 static void set_local_port_range(struct net *net, int range[2])
54 bool same_parity = !((range[0] ^ range[1]) & 1);
56 write_seqlock_bh(&net->ipv4.ip_local_ports.lock);
57 if (same_parity && !net->ipv4.ip_local_ports.warned) {
58 net->ipv4.ip_local_ports.warned = true;
59 pr_err_ratelimited("ip_local_port_range: prefer different parity for start/end values.\n");
61 net->ipv4.ip_local_ports.range[0] = range[0];
62 net->ipv4.ip_local_ports.range[1] = range[1];
63 write_sequnlock_bh(&net->ipv4.ip_local_ports.lock);
66 /* Validate changes from /proc interface. */
67 static int ipv4_local_port_range(struct ctl_table *table, int write,
69 size_t *lenp, loff_t *ppos)
72 container_of(table->data, struct net, ipv4.ip_local_ports.range);
75 struct ctl_table tmp = {
77 .maxlen = sizeof(range),
79 .extra1 = &ip_local_port_range_min,
80 .extra2 = &ip_local_port_range_max,
83 inet_get_local_port_range(net, &range[0], &range[1]);
85 ret = proc_dointvec_minmax(&tmp, write, buffer, lenp, ppos);
87 if (write && ret == 0) {
88 /* Ensure that the upper limit is not smaller than the lower,
89 * and that the lower does not encroach upon the privileged
92 if ((range[1] < range[0]) ||
93 (range[0] < net->ipv4.sysctl_ip_prot_sock))
96 set_local_port_range(net, range);
102 /* Validate changes from /proc interface. */
103 static int ipv4_privileged_ports(struct ctl_table *table, int write,
104 void __user *buffer, size_t *lenp, loff_t *ppos)
106 struct net *net = container_of(table->data, struct net,
107 ipv4.sysctl_ip_prot_sock);
111 struct ctl_table tmp = {
113 .maxlen = sizeof(pports),
115 .extra1 = &ip_privileged_port_min,
116 .extra2 = &ip_privileged_port_max,
119 pports = net->ipv4.sysctl_ip_prot_sock;
121 ret = proc_dointvec_minmax(&tmp, write, buffer, lenp, ppos);
123 if (write && ret == 0) {
124 inet_get_local_port_range(net, &range[0], &range[1]);
125 /* Ensure that the local port range doesn't overlap with the
126 * privileged port range.
128 if (range[0] < pports)
131 net->ipv4.sysctl_ip_prot_sock = pports;
137 static void inet_get_ping_group_range_table(struct ctl_table *table, kgid_t *low, kgid_t *high)
139 kgid_t *data = table->data;
141 container_of(table->data, struct net, ipv4.ping_group_range.range);
144 seq = read_seqbegin(&net->ipv4.ping_group_range.lock);
148 } while (read_seqretry(&net->ipv4.ping_group_range.lock, seq));
151 /* Update system visible IP port range */
152 static void set_ping_group_range(struct ctl_table *table, kgid_t low, kgid_t high)
154 kgid_t *data = table->data;
156 container_of(table->data, struct net, ipv4.ping_group_range.range);
157 write_seqlock(&net->ipv4.ping_group_range.lock);
160 write_sequnlock(&net->ipv4.ping_group_range.lock);
163 /* Validate changes from /proc interface. */
164 static int ipv4_ping_group_range(struct ctl_table *table, int write,
166 size_t *lenp, loff_t *ppos)
168 struct user_namespace *user_ns = current_user_ns();
172 struct ctl_table tmp = {
174 .maxlen = sizeof(urange),
176 .extra1 = &ip_ping_group_range_min,
177 .extra2 = &ip_ping_group_range_max,
180 inet_get_ping_group_range_table(table, &low, &high);
181 urange[0] = from_kgid_munged(user_ns, low);
182 urange[1] = from_kgid_munged(user_ns, high);
183 ret = proc_dointvec_minmax(&tmp, write, buffer, lenp, ppos);
185 if (write && ret == 0) {
186 low = make_kgid(user_ns, urange[0]);
187 high = make_kgid(user_ns, urange[1]);
188 if (!gid_valid(low) || !gid_valid(high) ||
189 (urange[1] < urange[0]) || gid_lt(high, low)) {
190 low = make_kgid(&init_user_ns, 1);
191 high = make_kgid(&init_user_ns, 0);
193 set_ping_group_range(table, low, high);
199 static int proc_tcp_congestion_control(struct ctl_table *ctl, int write,
200 void __user *buffer, size_t *lenp, loff_t *ppos)
202 char val[TCP_CA_NAME_MAX];
203 struct ctl_table tbl = {
205 .maxlen = TCP_CA_NAME_MAX,
209 tcp_get_default_congestion_control(val);
211 ret = proc_dostring(&tbl, write, buffer, lenp, ppos);
212 if (write && ret == 0)
213 ret = tcp_set_default_congestion_control(val);
217 static int proc_tcp_available_congestion_control(struct ctl_table *ctl,
219 void __user *buffer, size_t *lenp,
222 struct ctl_table tbl = { .maxlen = TCP_CA_BUF_MAX, };
225 tbl.data = kmalloc(tbl.maxlen, GFP_USER);
228 tcp_get_available_congestion_control(tbl.data, TCP_CA_BUF_MAX);
229 ret = proc_dostring(&tbl, write, buffer, lenp, ppos);
234 static int proc_allowed_congestion_control(struct ctl_table *ctl,
236 void __user *buffer, size_t *lenp,
239 struct ctl_table tbl = { .maxlen = TCP_CA_BUF_MAX };
242 tbl.data = kmalloc(tbl.maxlen, GFP_USER);
246 tcp_get_allowed_congestion_control(tbl.data, tbl.maxlen);
247 ret = proc_dostring(&tbl, write, buffer, lenp, ppos);
248 if (write && ret == 0)
249 ret = tcp_set_allowed_congestion_control(tbl.data);
254 static int proc_tcp_fastopen_key(struct ctl_table *table, int write,
255 void __user *buffer, size_t *lenp,
258 struct net *net = container_of(table->data, struct net,
259 ipv4.sysctl_tcp_fastopen);
260 struct ctl_table tbl = { .maxlen = (TCP_FASTOPEN_KEY_LENGTH * 2 + 10) };
261 struct tcp_fastopen_context *ctxt;
263 u32 user_key[4]; /* 16 bytes, matching TCP_FASTOPEN_KEY_LENGTH */
265 tbl.data = kmalloc(tbl.maxlen, GFP_KERNEL);
270 ctxt = rcu_dereference(net->ipv4.tcp_fastopen_ctx);
272 memcpy(user_key, ctxt->key, TCP_FASTOPEN_KEY_LENGTH);
274 memset(user_key, 0, sizeof(user_key));
277 snprintf(tbl.data, tbl.maxlen, "%08x-%08x-%08x-%08x",
278 user_key[0], user_key[1], user_key[2], user_key[3]);
279 ret = proc_dostring(&tbl, write, buffer, lenp, ppos);
281 if (write && ret == 0) {
282 if (sscanf(tbl.data, "%x-%x-%x-%x", user_key, user_key + 1,
283 user_key + 2, user_key + 3) != 4) {
287 tcp_fastopen_reset_cipher(net, user_key, TCP_FASTOPEN_KEY_LENGTH);
291 pr_debug("proc FO key set 0x%x-%x-%x-%x <- 0x%s: %u\n",
292 user_key[0], user_key[1], user_key[2], user_key[3],
293 (char *)tbl.data, ret);
298 static void proc_configure_early_demux(int enabled, int protocol)
300 struct net_protocol *ipprot;
301 #if IS_ENABLED(CONFIG_IPV6)
302 struct inet6_protocol *ip6prot;
307 ipprot = rcu_dereference(inet_protos[protocol]);
309 ipprot->early_demux = enabled ? ipprot->early_demux_handler :
312 #if IS_ENABLED(CONFIG_IPV6)
313 ip6prot = rcu_dereference(inet6_protos[protocol]);
315 ip6prot->early_demux = enabled ? ip6prot->early_demux_handler :
321 static int proc_tcp_early_demux(struct ctl_table *table, int write,
322 void __user *buffer, size_t *lenp, loff_t *ppos)
326 ret = proc_dointvec(table, write, buffer, lenp, ppos);
329 int enabled = init_net.ipv4.sysctl_tcp_early_demux;
331 proc_configure_early_demux(enabled, IPPROTO_TCP);
337 static int proc_udp_early_demux(struct ctl_table *table, int write,
338 void __user *buffer, size_t *lenp, loff_t *ppos)
342 ret = proc_dointvec(table, write, buffer, lenp, ppos);
345 int enabled = init_net.ipv4.sysctl_udp_early_demux;
347 proc_configure_early_demux(enabled, IPPROTO_UDP);
353 static int proc_tfo_blackhole_detect_timeout(struct ctl_table *table,
356 size_t *lenp, loff_t *ppos)
358 struct net *net = container_of(table->data, struct net,
359 ipv4.sysctl_tcp_fastopen_blackhole_timeout);
362 ret = proc_dointvec_minmax(table, write, buffer, lenp, ppos);
363 if (write && ret == 0)
364 atomic_set(&net->ipv4.tfo_active_disable_times, 0);
369 static int proc_tcp_available_ulp(struct ctl_table *ctl,
371 void __user *buffer, size_t *lenp,
374 struct ctl_table tbl = { .maxlen = TCP_ULP_BUF_MAX, };
377 tbl.data = kmalloc(tbl.maxlen, GFP_USER);
380 tcp_get_available_ulp(tbl.data, TCP_ULP_BUF_MAX);
381 ret = proc_dostring(&tbl, write, buffer, lenp, ppos);
387 static struct ctl_table ipv4_table[] = {
389 .procname = "tcp_retrans_collapse",
390 .data = &sysctl_tcp_retrans_collapse,
391 .maxlen = sizeof(int),
393 .proc_handler = proc_dointvec
396 .procname = "tcp_max_orphans",
397 .data = &sysctl_tcp_max_orphans,
398 .maxlen = sizeof(int),
400 .proc_handler = proc_dointvec
403 .procname = "tcp_abort_on_overflow",
404 .data = &sysctl_tcp_abort_on_overflow,
405 .maxlen = sizeof(int),
407 .proc_handler = proc_dointvec
410 .procname = "tcp_stdurg",
411 .data = &sysctl_tcp_stdurg,
412 .maxlen = sizeof(int),
414 .proc_handler = proc_dointvec
417 .procname = "tcp_rfc1337",
418 .data = &sysctl_tcp_rfc1337,
419 .maxlen = sizeof(int),
421 .proc_handler = proc_dointvec
424 .procname = "inet_peer_threshold",
425 .data = &inet_peer_threshold,
426 .maxlen = sizeof(int),
428 .proc_handler = proc_dointvec
431 .procname = "inet_peer_minttl",
432 .data = &inet_peer_minttl,
433 .maxlen = sizeof(int),
435 .proc_handler = proc_dointvec_jiffies,
438 .procname = "inet_peer_maxttl",
439 .data = &inet_peer_maxttl,
440 .maxlen = sizeof(int),
442 .proc_handler = proc_dointvec_jiffies,
445 .procname = "tcp_fack",
446 .data = &sysctl_tcp_fack,
447 .maxlen = sizeof(int),
449 .proc_handler = proc_dointvec
452 .procname = "tcp_recovery",
453 .data = &sysctl_tcp_recovery,
454 .maxlen = sizeof(int),
456 .proc_handler = proc_dointvec,
459 .procname = "tcp_max_reordering",
460 .data = &sysctl_tcp_max_reordering,
461 .maxlen = sizeof(int),
463 .proc_handler = proc_dointvec
466 .procname = "tcp_dsack",
467 .data = &sysctl_tcp_dsack,
468 .maxlen = sizeof(int),
470 .proc_handler = proc_dointvec
473 .procname = "tcp_mem",
474 .maxlen = sizeof(sysctl_tcp_mem),
475 .data = &sysctl_tcp_mem,
477 .proc_handler = proc_doulongvec_minmax,
480 .procname = "tcp_wmem",
481 .data = &sysctl_tcp_wmem,
482 .maxlen = sizeof(sysctl_tcp_wmem),
484 .proc_handler = proc_dointvec_minmax,
488 .procname = "tcp_rmem",
489 .data = &sysctl_tcp_rmem,
490 .maxlen = sizeof(sysctl_tcp_rmem),
492 .proc_handler = proc_dointvec_minmax,
496 .procname = "tcp_app_win",
497 .data = &sysctl_tcp_app_win,
498 .maxlen = sizeof(int),
500 .proc_handler = proc_dointvec
503 .procname = "tcp_adv_win_scale",
504 .data = &sysctl_tcp_adv_win_scale,
505 .maxlen = sizeof(int),
507 .proc_handler = proc_dointvec_minmax,
508 .extra1 = &tcp_adv_win_scale_min,
509 .extra2 = &tcp_adv_win_scale_max,
512 .procname = "tcp_frto",
513 .data = &sysctl_tcp_frto,
514 .maxlen = sizeof(int),
516 .proc_handler = proc_dointvec
519 .procname = "tcp_min_rtt_wlen",
520 .data = &sysctl_tcp_min_rtt_wlen,
521 .maxlen = sizeof(int),
523 .proc_handler = proc_dointvec
526 .procname = "tcp_low_latency",
527 .data = &sysctl_tcp_low_latency,
528 .maxlen = sizeof(int),
530 .proc_handler = proc_dointvec
533 .procname = "tcp_no_metrics_save",
534 .data = &sysctl_tcp_nometrics_save,
535 .maxlen = sizeof(int),
537 .proc_handler = proc_dointvec,
540 .procname = "tcp_moderate_rcvbuf",
541 .data = &sysctl_tcp_moderate_rcvbuf,
542 .maxlen = sizeof(int),
544 .proc_handler = proc_dointvec,
547 .procname = "tcp_tso_win_divisor",
548 .data = &sysctl_tcp_tso_win_divisor,
549 .maxlen = sizeof(int),
551 .proc_handler = proc_dointvec,
554 .procname = "tcp_congestion_control",
556 .maxlen = TCP_CA_NAME_MAX,
557 .proc_handler = proc_tcp_congestion_control,
560 .procname = "tcp_workaround_signed_windows",
561 .data = &sysctl_tcp_workaround_signed_windows,
562 .maxlen = sizeof(int),
564 .proc_handler = proc_dointvec
567 .procname = "tcp_limit_output_bytes",
568 .data = &sysctl_tcp_limit_output_bytes,
569 .maxlen = sizeof(int),
571 .proc_handler = proc_dointvec
574 .procname = "tcp_challenge_ack_limit",
575 .data = &sysctl_tcp_challenge_ack_limit,
576 .maxlen = sizeof(int),
578 .proc_handler = proc_dointvec
581 .procname = "tcp_slow_start_after_idle",
582 .data = &sysctl_tcp_slow_start_after_idle,
583 .maxlen = sizeof(int),
585 .proc_handler = proc_dointvec
587 #ifdef CONFIG_NETLABEL
589 .procname = "cipso_cache_enable",
590 .data = &cipso_v4_cache_enabled,
591 .maxlen = sizeof(int),
593 .proc_handler = proc_dointvec,
596 .procname = "cipso_cache_bucket_size",
597 .data = &cipso_v4_cache_bucketsize,
598 .maxlen = sizeof(int),
600 .proc_handler = proc_dointvec,
603 .procname = "cipso_rbm_optfmt",
604 .data = &cipso_v4_rbm_optfmt,
605 .maxlen = sizeof(int),
607 .proc_handler = proc_dointvec,
610 .procname = "cipso_rbm_strictvalid",
611 .data = &cipso_v4_rbm_strictvalid,
612 .maxlen = sizeof(int),
614 .proc_handler = proc_dointvec,
616 #endif /* CONFIG_NETLABEL */
618 .procname = "tcp_available_congestion_control",
619 .maxlen = TCP_CA_BUF_MAX,
621 .proc_handler = proc_tcp_available_congestion_control,
624 .procname = "tcp_allowed_congestion_control",
625 .maxlen = TCP_CA_BUF_MAX,
627 .proc_handler = proc_allowed_congestion_control,
630 .procname = "tcp_thin_linear_timeouts",
631 .data = &sysctl_tcp_thin_linear_timeouts,
632 .maxlen = sizeof(int),
634 .proc_handler = proc_dointvec
637 .procname = "tcp_early_retrans",
638 .data = &sysctl_tcp_early_retrans,
639 .maxlen = sizeof(int),
641 .proc_handler = proc_dointvec_minmax,
646 .procname = "tcp_min_tso_segs",
647 .data = &sysctl_tcp_min_tso_segs,
648 .maxlen = sizeof(int),
650 .proc_handler = proc_dointvec_minmax,
652 .extra2 = &gso_max_segs,
655 .procname = "tcp_pacing_ss_ratio",
656 .data = &sysctl_tcp_pacing_ss_ratio,
657 .maxlen = sizeof(int),
659 .proc_handler = proc_dointvec_minmax,
664 .procname = "tcp_pacing_ca_ratio",
665 .data = &sysctl_tcp_pacing_ca_ratio,
666 .maxlen = sizeof(int),
668 .proc_handler = proc_dointvec_minmax,
673 .procname = "tcp_autocorking",
674 .data = &sysctl_tcp_autocorking,
675 .maxlen = sizeof(int),
677 .proc_handler = proc_dointvec_minmax,
682 .procname = "tcp_invalid_ratelimit",
683 .data = &sysctl_tcp_invalid_ratelimit,
684 .maxlen = sizeof(int),
686 .proc_handler = proc_dointvec_ms_jiffies,
689 .procname = "tcp_available_ulp",
690 .maxlen = TCP_ULP_BUF_MAX,
692 .proc_handler = proc_tcp_available_ulp,
695 .procname = "icmp_msgs_per_sec",
696 .data = &sysctl_icmp_msgs_per_sec,
697 .maxlen = sizeof(int),
699 .proc_handler = proc_dointvec_minmax,
703 .procname = "icmp_msgs_burst",
704 .data = &sysctl_icmp_msgs_burst,
705 .maxlen = sizeof(int),
707 .proc_handler = proc_dointvec_minmax,
711 .procname = "udp_mem",
712 .data = &sysctl_udp_mem,
713 .maxlen = sizeof(sysctl_udp_mem),
715 .proc_handler = proc_doulongvec_minmax,
718 .procname = "udp_rmem_min",
719 .data = &sysctl_udp_rmem_min,
720 .maxlen = sizeof(sysctl_udp_rmem_min),
722 .proc_handler = proc_dointvec_minmax,
726 .procname = "udp_wmem_min",
727 .data = &sysctl_udp_wmem_min,
728 .maxlen = sizeof(sysctl_udp_wmem_min),
730 .proc_handler = proc_dointvec_minmax,
736 static struct ctl_table ipv4_net_table[] = {
738 .procname = "icmp_echo_ignore_all",
739 .data = &init_net.ipv4.sysctl_icmp_echo_ignore_all,
740 .maxlen = sizeof(int),
742 .proc_handler = proc_dointvec
745 .procname = "icmp_echo_ignore_broadcasts",
746 .data = &init_net.ipv4.sysctl_icmp_echo_ignore_broadcasts,
747 .maxlen = sizeof(int),
749 .proc_handler = proc_dointvec
752 .procname = "icmp_ignore_bogus_error_responses",
753 .data = &init_net.ipv4.sysctl_icmp_ignore_bogus_error_responses,
754 .maxlen = sizeof(int),
756 .proc_handler = proc_dointvec
759 .procname = "icmp_errors_use_inbound_ifaddr",
760 .data = &init_net.ipv4.sysctl_icmp_errors_use_inbound_ifaddr,
761 .maxlen = sizeof(int),
763 .proc_handler = proc_dointvec
766 .procname = "icmp_ratelimit",
767 .data = &init_net.ipv4.sysctl_icmp_ratelimit,
768 .maxlen = sizeof(int),
770 .proc_handler = proc_dointvec_ms_jiffies,
773 .procname = "icmp_ratemask",
774 .data = &init_net.ipv4.sysctl_icmp_ratemask,
775 .maxlen = sizeof(int),
777 .proc_handler = proc_dointvec
780 .procname = "ping_group_range",
781 .data = &init_net.ipv4.ping_group_range.range,
782 .maxlen = sizeof(gid_t)*2,
784 .proc_handler = ipv4_ping_group_range,
787 .procname = "tcp_ecn",
788 .data = &init_net.ipv4.sysctl_tcp_ecn,
789 .maxlen = sizeof(int),
791 .proc_handler = proc_dointvec
794 .procname = "tcp_ecn_fallback",
795 .data = &init_net.ipv4.sysctl_tcp_ecn_fallback,
796 .maxlen = sizeof(int),
798 .proc_handler = proc_dointvec
801 .procname = "ip_dynaddr",
802 .data = &init_net.ipv4.sysctl_ip_dynaddr,
803 .maxlen = sizeof(int),
805 .proc_handler = proc_dointvec
808 .procname = "ip_early_demux",
809 .data = &init_net.ipv4.sysctl_ip_early_demux,
810 .maxlen = sizeof(int),
812 .proc_handler = proc_dointvec
815 .procname = "udp_early_demux",
816 .data = &init_net.ipv4.sysctl_udp_early_demux,
817 .maxlen = sizeof(int),
819 .proc_handler = proc_udp_early_demux
822 .procname = "tcp_early_demux",
823 .data = &init_net.ipv4.sysctl_tcp_early_demux,
824 .maxlen = sizeof(int),
826 .proc_handler = proc_tcp_early_demux
829 .procname = "ip_default_ttl",
830 .data = &init_net.ipv4.sysctl_ip_default_ttl,
831 .maxlen = sizeof(int),
833 .proc_handler = proc_dointvec_minmax,
834 .extra1 = &ip_ttl_min,
835 .extra2 = &ip_ttl_max,
838 .procname = "ip_local_port_range",
839 .maxlen = sizeof(init_net.ipv4.ip_local_ports.range),
840 .data = &init_net.ipv4.ip_local_ports.range,
842 .proc_handler = ipv4_local_port_range,
845 .procname = "ip_local_reserved_ports",
846 .data = &init_net.ipv4.sysctl_local_reserved_ports,
849 .proc_handler = proc_do_large_bitmap,
852 .procname = "ip_no_pmtu_disc",
853 .data = &init_net.ipv4.sysctl_ip_no_pmtu_disc,
854 .maxlen = sizeof(int),
856 .proc_handler = proc_dointvec
859 .procname = "ip_forward_use_pmtu",
860 .data = &init_net.ipv4.sysctl_ip_fwd_use_pmtu,
861 .maxlen = sizeof(int),
863 .proc_handler = proc_dointvec,
866 .procname = "ip_nonlocal_bind",
867 .data = &init_net.ipv4.sysctl_ip_nonlocal_bind,
868 .maxlen = sizeof(int),
870 .proc_handler = proc_dointvec
873 .procname = "fwmark_reflect",
874 .data = &init_net.ipv4.sysctl_fwmark_reflect,
875 .maxlen = sizeof(int),
877 .proc_handler = proc_dointvec,
880 .procname = "tcp_fwmark_accept",
881 .data = &init_net.ipv4.sysctl_tcp_fwmark_accept,
882 .maxlen = sizeof(int),
884 .proc_handler = proc_dointvec,
886 #ifdef CONFIG_NET_L3_MASTER_DEV
888 .procname = "tcp_l3mdev_accept",
889 .data = &init_net.ipv4.sysctl_tcp_l3mdev_accept,
890 .maxlen = sizeof(int),
892 .proc_handler = proc_dointvec_minmax,
898 .procname = "tcp_mtu_probing",
899 .data = &init_net.ipv4.sysctl_tcp_mtu_probing,
900 .maxlen = sizeof(int),
902 .proc_handler = proc_dointvec,
905 .procname = "tcp_base_mss",
906 .data = &init_net.ipv4.sysctl_tcp_base_mss,
907 .maxlen = sizeof(int),
909 .proc_handler = proc_dointvec,
912 .procname = "tcp_probe_threshold",
913 .data = &init_net.ipv4.sysctl_tcp_probe_threshold,
914 .maxlen = sizeof(int),
916 .proc_handler = proc_dointvec,
919 .procname = "tcp_probe_interval",
920 .data = &init_net.ipv4.sysctl_tcp_probe_interval,
921 .maxlen = sizeof(int),
923 .proc_handler = proc_dointvec,
926 .procname = "igmp_link_local_mcast_reports",
927 .data = &init_net.ipv4.sysctl_igmp_llm_reports,
928 .maxlen = sizeof(int),
930 .proc_handler = proc_dointvec
933 .procname = "igmp_max_memberships",
934 .data = &init_net.ipv4.sysctl_igmp_max_memberships,
935 .maxlen = sizeof(int),
937 .proc_handler = proc_dointvec
940 .procname = "igmp_max_msf",
941 .data = &init_net.ipv4.sysctl_igmp_max_msf,
942 .maxlen = sizeof(int),
944 .proc_handler = proc_dointvec
946 #ifdef CONFIG_IP_MULTICAST
948 .procname = "igmp_qrv",
949 .data = &init_net.ipv4.sysctl_igmp_qrv,
950 .maxlen = sizeof(int),
952 .proc_handler = proc_dointvec_minmax,
957 .procname = "tcp_keepalive_time",
958 .data = &init_net.ipv4.sysctl_tcp_keepalive_time,
959 .maxlen = sizeof(int),
961 .proc_handler = proc_dointvec_jiffies,
964 .procname = "tcp_keepalive_probes",
965 .data = &init_net.ipv4.sysctl_tcp_keepalive_probes,
966 .maxlen = sizeof(int),
968 .proc_handler = proc_dointvec
971 .procname = "tcp_keepalive_intvl",
972 .data = &init_net.ipv4.sysctl_tcp_keepalive_intvl,
973 .maxlen = sizeof(int),
975 .proc_handler = proc_dointvec_jiffies,
978 .procname = "tcp_syn_retries",
979 .data = &init_net.ipv4.sysctl_tcp_syn_retries,
980 .maxlen = sizeof(int),
982 .proc_handler = proc_dointvec_minmax,
983 .extra1 = &tcp_syn_retries_min,
984 .extra2 = &tcp_syn_retries_max
987 .procname = "tcp_synack_retries",
988 .data = &init_net.ipv4.sysctl_tcp_synack_retries,
989 .maxlen = sizeof(int),
991 .proc_handler = proc_dointvec
993 #ifdef CONFIG_SYN_COOKIES
995 .procname = "tcp_syncookies",
996 .data = &init_net.ipv4.sysctl_tcp_syncookies,
997 .maxlen = sizeof(int),
999 .proc_handler = proc_dointvec
1003 .procname = "tcp_reordering",
1004 .data = &init_net.ipv4.sysctl_tcp_reordering,
1005 .maxlen = sizeof(int),
1007 .proc_handler = proc_dointvec
1010 .procname = "tcp_retries1",
1011 .data = &init_net.ipv4.sysctl_tcp_retries1,
1012 .maxlen = sizeof(int),
1014 .proc_handler = proc_dointvec_minmax,
1015 .extra2 = &tcp_retr1_max
1018 .procname = "tcp_retries2",
1019 .data = &init_net.ipv4.sysctl_tcp_retries2,
1020 .maxlen = sizeof(int),
1022 .proc_handler = proc_dointvec
1025 .procname = "tcp_orphan_retries",
1026 .data = &init_net.ipv4.sysctl_tcp_orphan_retries,
1027 .maxlen = sizeof(int),
1029 .proc_handler = proc_dointvec
1032 .procname = "tcp_fin_timeout",
1033 .data = &init_net.ipv4.sysctl_tcp_fin_timeout,
1034 .maxlen = sizeof(int),
1036 .proc_handler = proc_dointvec_jiffies,
1039 .procname = "tcp_notsent_lowat",
1040 .data = &init_net.ipv4.sysctl_tcp_notsent_lowat,
1041 .maxlen = sizeof(unsigned int),
1043 .proc_handler = proc_douintvec,
1046 .procname = "tcp_tw_reuse",
1047 .data = &init_net.ipv4.sysctl_tcp_tw_reuse,
1048 .maxlen = sizeof(int),
1050 .proc_handler = proc_dointvec
1053 .procname = "tcp_max_tw_buckets",
1054 .data = &init_net.ipv4.tcp_death_row.sysctl_max_tw_buckets,
1055 .maxlen = sizeof(int),
1057 .proc_handler = proc_dointvec
1060 .procname = "tcp_max_syn_backlog",
1061 .data = &init_net.ipv4.sysctl_max_syn_backlog,
1062 .maxlen = sizeof(int),
1064 .proc_handler = proc_dointvec
1067 .procname = "tcp_fastopen",
1068 .data = &init_net.ipv4.sysctl_tcp_fastopen,
1069 .maxlen = sizeof(int),
1071 .proc_handler = proc_dointvec,
1074 .procname = "tcp_fastopen_key",
1076 .data = &init_net.ipv4.sysctl_tcp_fastopen,
1077 .maxlen = ((TCP_FASTOPEN_KEY_LENGTH * 2) + 10),
1078 .proc_handler = proc_tcp_fastopen_key,
1081 .procname = "tcp_fastopen_blackhole_timeout_sec",
1082 .data = &init_net.ipv4.sysctl_tcp_fastopen_blackhole_timeout,
1083 .maxlen = sizeof(int),
1085 .proc_handler = proc_tfo_blackhole_detect_timeout,
1088 #ifdef CONFIG_IP_ROUTE_MULTIPATH
1090 .procname = "fib_multipath_use_neigh",
1091 .data = &init_net.ipv4.sysctl_fib_multipath_use_neigh,
1092 .maxlen = sizeof(int),
1094 .proc_handler = proc_dointvec_minmax,
1099 .procname = "fib_multipath_hash_policy",
1100 .data = &init_net.ipv4.sysctl_fib_multipath_hash_policy,
1101 .maxlen = sizeof(int),
1103 .proc_handler = proc_dointvec_minmax,
1109 .procname = "ip_unprivileged_port_start",
1110 .maxlen = sizeof(int),
1111 .data = &init_net.ipv4.sysctl_ip_prot_sock,
1113 .proc_handler = ipv4_privileged_ports,
1115 #ifdef CONFIG_NET_L3_MASTER_DEV
1117 .procname = "udp_l3mdev_accept",
1118 .data = &init_net.ipv4.sysctl_udp_l3mdev_accept,
1119 .maxlen = sizeof(int),
1121 .proc_handler = proc_dointvec_minmax,
1127 .procname = "tcp_sack",
1128 .data = &init_net.ipv4.sysctl_tcp_sack,
1129 .maxlen = sizeof(int),
1131 .proc_handler = proc_dointvec
1134 .procname = "tcp_window_scaling",
1135 .data = &init_net.ipv4.sysctl_tcp_window_scaling,
1136 .maxlen = sizeof(int),
1138 .proc_handler = proc_dointvec
1141 .procname = "tcp_timestamps",
1142 .data = &init_net.ipv4.sysctl_tcp_timestamps,
1143 .maxlen = sizeof(int),
1145 .proc_handler = proc_dointvec
1150 static __net_init int ipv4_sysctl_init_net(struct net *net)
1152 struct ctl_table *table;
1154 table = ipv4_net_table;
1155 if (!net_eq(net, &init_net)) {
1158 table = kmemdup(table, sizeof(ipv4_net_table), GFP_KERNEL);
1162 /* Update the variables to point into the current struct net */
1163 for (i = 0; i < ARRAY_SIZE(ipv4_net_table) - 1; i++)
1164 table[i].data += (void *)net - (void *)&init_net;
1167 net->ipv4.ipv4_hdr = register_net_sysctl(net, "net/ipv4", table);
1168 if (!net->ipv4.ipv4_hdr)
1171 net->ipv4.sysctl_local_reserved_ports = kzalloc(65536 / 8, GFP_KERNEL);
1172 if (!net->ipv4.sysctl_local_reserved_ports)
1178 unregister_net_sysctl_table(net->ipv4.ipv4_hdr);
1180 if (!net_eq(net, &init_net))
1186 static __net_exit void ipv4_sysctl_exit_net(struct net *net)
1188 struct ctl_table *table;
1190 kfree(net->ipv4.sysctl_local_reserved_ports);
1191 table = net->ipv4.ipv4_hdr->ctl_table_arg;
1192 unregister_net_sysctl_table(net->ipv4.ipv4_hdr);
1196 static __net_initdata struct pernet_operations ipv4_sysctl_ops = {
1197 .init = ipv4_sysctl_init_net,
1198 .exit = ipv4_sysctl_exit_net,
1201 static __init int sysctl_ipv4_init(void)
1203 struct ctl_table_header *hdr;
1205 hdr = register_net_sysctl(&init_net, "net/ipv4", ipv4_table);
1209 if (register_pernet_subsys(&ipv4_sysctl_ops)) {
1210 unregister_net_sysctl_table(hdr);
1217 __initcall(sysctl_ipv4_init);