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, NULL, user_key,
288 TCP_FASTOPEN_KEY_LENGTH);
292 pr_debug("proc FO key set 0x%x-%x-%x-%x <- 0x%s: %u\n",
293 user_key[0], user_key[1], user_key[2], user_key[3],
294 (char *)tbl.data, ret);
299 static void proc_configure_early_demux(int enabled, int protocol)
301 struct net_protocol *ipprot;
302 #if IS_ENABLED(CONFIG_IPV6)
303 struct inet6_protocol *ip6prot;
308 ipprot = rcu_dereference(inet_protos[protocol]);
310 ipprot->early_demux = enabled ? ipprot->early_demux_handler :
313 #if IS_ENABLED(CONFIG_IPV6)
314 ip6prot = rcu_dereference(inet6_protos[protocol]);
316 ip6prot->early_demux = enabled ? ip6prot->early_demux_handler :
322 static int proc_tcp_early_demux(struct ctl_table *table, int write,
323 void __user *buffer, size_t *lenp, loff_t *ppos)
327 ret = proc_dointvec(table, write, buffer, lenp, ppos);
330 int enabled = init_net.ipv4.sysctl_tcp_early_demux;
332 proc_configure_early_demux(enabled, IPPROTO_TCP);
338 static int proc_udp_early_demux(struct ctl_table *table, int write,
339 void __user *buffer, size_t *lenp, loff_t *ppos)
343 ret = proc_dointvec(table, write, buffer, lenp, ppos);
346 int enabled = init_net.ipv4.sysctl_udp_early_demux;
348 proc_configure_early_demux(enabled, IPPROTO_UDP);
354 static int proc_tfo_blackhole_detect_timeout(struct ctl_table *table,
357 size_t *lenp, loff_t *ppos)
359 struct net *net = container_of(table->data, struct net,
360 ipv4.sysctl_tcp_fastopen_blackhole_timeout);
363 ret = proc_dointvec_minmax(table, write, buffer, lenp, ppos);
364 if (write && ret == 0)
365 atomic_set(&net->ipv4.tfo_active_disable_times, 0);
370 static int proc_tcp_available_ulp(struct ctl_table *ctl,
372 void __user *buffer, size_t *lenp,
375 struct ctl_table tbl = { .maxlen = TCP_ULP_BUF_MAX, };
378 tbl.data = kmalloc(tbl.maxlen, GFP_USER);
381 tcp_get_available_ulp(tbl.data, TCP_ULP_BUF_MAX);
382 ret = proc_dostring(&tbl, write, buffer, lenp, ppos);
388 static struct ctl_table ipv4_table[] = {
390 .procname = "tcp_max_orphans",
391 .data = &sysctl_tcp_max_orphans,
392 .maxlen = sizeof(int),
394 .proc_handler = proc_dointvec
397 .procname = "inet_peer_threshold",
398 .data = &inet_peer_threshold,
399 .maxlen = sizeof(int),
401 .proc_handler = proc_dointvec
404 .procname = "inet_peer_minttl",
405 .data = &inet_peer_minttl,
406 .maxlen = sizeof(int),
408 .proc_handler = proc_dointvec_jiffies,
411 .procname = "inet_peer_maxttl",
412 .data = &inet_peer_maxttl,
413 .maxlen = sizeof(int),
415 .proc_handler = proc_dointvec_jiffies,
418 .procname = "tcp_mem",
419 .maxlen = sizeof(sysctl_tcp_mem),
420 .data = &sysctl_tcp_mem,
422 .proc_handler = proc_doulongvec_minmax,
425 .procname = "tcp_wmem",
426 .data = &sysctl_tcp_wmem,
427 .maxlen = sizeof(sysctl_tcp_wmem),
429 .proc_handler = proc_dointvec_minmax,
433 .procname = "tcp_rmem",
434 .data = &sysctl_tcp_rmem,
435 .maxlen = sizeof(sysctl_tcp_rmem),
437 .proc_handler = proc_dointvec_minmax,
441 .procname = "tcp_low_latency",
442 .data = &sysctl_tcp_low_latency,
443 .maxlen = sizeof(int),
445 .proc_handler = proc_dointvec
448 .procname = "tcp_congestion_control",
450 .maxlen = TCP_CA_NAME_MAX,
451 .proc_handler = proc_tcp_congestion_control,
453 #ifdef CONFIG_NETLABEL
455 .procname = "cipso_cache_enable",
456 .data = &cipso_v4_cache_enabled,
457 .maxlen = sizeof(int),
459 .proc_handler = proc_dointvec,
462 .procname = "cipso_cache_bucket_size",
463 .data = &cipso_v4_cache_bucketsize,
464 .maxlen = sizeof(int),
466 .proc_handler = proc_dointvec,
469 .procname = "cipso_rbm_optfmt",
470 .data = &cipso_v4_rbm_optfmt,
471 .maxlen = sizeof(int),
473 .proc_handler = proc_dointvec,
476 .procname = "cipso_rbm_strictvalid",
477 .data = &cipso_v4_rbm_strictvalid,
478 .maxlen = sizeof(int),
480 .proc_handler = proc_dointvec,
482 #endif /* CONFIG_NETLABEL */
484 .procname = "tcp_available_congestion_control",
485 .maxlen = TCP_CA_BUF_MAX,
487 .proc_handler = proc_tcp_available_congestion_control,
490 .procname = "tcp_allowed_congestion_control",
491 .maxlen = TCP_CA_BUF_MAX,
493 .proc_handler = proc_allowed_congestion_control,
496 .procname = "tcp_available_ulp",
497 .maxlen = TCP_ULP_BUF_MAX,
499 .proc_handler = proc_tcp_available_ulp,
502 .procname = "icmp_msgs_per_sec",
503 .data = &sysctl_icmp_msgs_per_sec,
504 .maxlen = sizeof(int),
506 .proc_handler = proc_dointvec_minmax,
510 .procname = "icmp_msgs_burst",
511 .data = &sysctl_icmp_msgs_burst,
512 .maxlen = sizeof(int),
514 .proc_handler = proc_dointvec_minmax,
518 .procname = "udp_mem",
519 .data = &sysctl_udp_mem,
520 .maxlen = sizeof(sysctl_udp_mem),
522 .proc_handler = proc_doulongvec_minmax,
525 .procname = "udp_rmem_min",
526 .data = &sysctl_udp_rmem_min,
527 .maxlen = sizeof(sysctl_udp_rmem_min),
529 .proc_handler = proc_dointvec_minmax,
533 .procname = "udp_wmem_min",
534 .data = &sysctl_udp_wmem_min,
535 .maxlen = sizeof(sysctl_udp_wmem_min),
537 .proc_handler = proc_dointvec_minmax,
543 static struct ctl_table ipv4_net_table[] = {
545 .procname = "icmp_echo_ignore_all",
546 .data = &init_net.ipv4.sysctl_icmp_echo_ignore_all,
547 .maxlen = sizeof(int),
549 .proc_handler = proc_dointvec
552 .procname = "icmp_echo_ignore_broadcasts",
553 .data = &init_net.ipv4.sysctl_icmp_echo_ignore_broadcasts,
554 .maxlen = sizeof(int),
556 .proc_handler = proc_dointvec
559 .procname = "icmp_ignore_bogus_error_responses",
560 .data = &init_net.ipv4.sysctl_icmp_ignore_bogus_error_responses,
561 .maxlen = sizeof(int),
563 .proc_handler = proc_dointvec
566 .procname = "icmp_errors_use_inbound_ifaddr",
567 .data = &init_net.ipv4.sysctl_icmp_errors_use_inbound_ifaddr,
568 .maxlen = sizeof(int),
570 .proc_handler = proc_dointvec
573 .procname = "icmp_ratelimit",
574 .data = &init_net.ipv4.sysctl_icmp_ratelimit,
575 .maxlen = sizeof(int),
577 .proc_handler = proc_dointvec_ms_jiffies,
580 .procname = "icmp_ratemask",
581 .data = &init_net.ipv4.sysctl_icmp_ratemask,
582 .maxlen = sizeof(int),
584 .proc_handler = proc_dointvec
587 .procname = "ping_group_range",
588 .data = &init_net.ipv4.ping_group_range.range,
589 .maxlen = sizeof(gid_t)*2,
591 .proc_handler = ipv4_ping_group_range,
594 .procname = "tcp_ecn",
595 .data = &init_net.ipv4.sysctl_tcp_ecn,
596 .maxlen = sizeof(int),
598 .proc_handler = proc_dointvec
601 .procname = "tcp_ecn_fallback",
602 .data = &init_net.ipv4.sysctl_tcp_ecn_fallback,
603 .maxlen = sizeof(int),
605 .proc_handler = proc_dointvec
608 .procname = "ip_dynaddr",
609 .data = &init_net.ipv4.sysctl_ip_dynaddr,
610 .maxlen = sizeof(int),
612 .proc_handler = proc_dointvec
615 .procname = "ip_early_demux",
616 .data = &init_net.ipv4.sysctl_ip_early_demux,
617 .maxlen = sizeof(int),
619 .proc_handler = proc_dointvec
622 .procname = "udp_early_demux",
623 .data = &init_net.ipv4.sysctl_udp_early_demux,
624 .maxlen = sizeof(int),
626 .proc_handler = proc_udp_early_demux
629 .procname = "tcp_early_demux",
630 .data = &init_net.ipv4.sysctl_tcp_early_demux,
631 .maxlen = sizeof(int),
633 .proc_handler = proc_tcp_early_demux
636 .procname = "ip_default_ttl",
637 .data = &init_net.ipv4.sysctl_ip_default_ttl,
638 .maxlen = sizeof(int),
640 .proc_handler = proc_dointvec_minmax,
641 .extra1 = &ip_ttl_min,
642 .extra2 = &ip_ttl_max,
645 .procname = "ip_local_port_range",
646 .maxlen = sizeof(init_net.ipv4.ip_local_ports.range),
647 .data = &init_net.ipv4.ip_local_ports.range,
649 .proc_handler = ipv4_local_port_range,
652 .procname = "ip_local_reserved_ports",
653 .data = &init_net.ipv4.sysctl_local_reserved_ports,
656 .proc_handler = proc_do_large_bitmap,
659 .procname = "ip_no_pmtu_disc",
660 .data = &init_net.ipv4.sysctl_ip_no_pmtu_disc,
661 .maxlen = sizeof(int),
663 .proc_handler = proc_dointvec
666 .procname = "ip_forward_use_pmtu",
667 .data = &init_net.ipv4.sysctl_ip_fwd_use_pmtu,
668 .maxlen = sizeof(int),
670 .proc_handler = proc_dointvec,
673 .procname = "ip_nonlocal_bind",
674 .data = &init_net.ipv4.sysctl_ip_nonlocal_bind,
675 .maxlen = sizeof(int),
677 .proc_handler = proc_dointvec
680 .procname = "fwmark_reflect",
681 .data = &init_net.ipv4.sysctl_fwmark_reflect,
682 .maxlen = sizeof(int),
684 .proc_handler = proc_dointvec,
687 .procname = "tcp_fwmark_accept",
688 .data = &init_net.ipv4.sysctl_tcp_fwmark_accept,
689 .maxlen = sizeof(int),
691 .proc_handler = proc_dointvec,
693 #ifdef CONFIG_NET_L3_MASTER_DEV
695 .procname = "tcp_l3mdev_accept",
696 .data = &init_net.ipv4.sysctl_tcp_l3mdev_accept,
697 .maxlen = sizeof(int),
699 .proc_handler = proc_dointvec_minmax,
705 .procname = "tcp_mtu_probing",
706 .data = &init_net.ipv4.sysctl_tcp_mtu_probing,
707 .maxlen = sizeof(int),
709 .proc_handler = proc_dointvec,
712 .procname = "tcp_base_mss",
713 .data = &init_net.ipv4.sysctl_tcp_base_mss,
714 .maxlen = sizeof(int),
716 .proc_handler = proc_dointvec,
719 .procname = "tcp_probe_threshold",
720 .data = &init_net.ipv4.sysctl_tcp_probe_threshold,
721 .maxlen = sizeof(int),
723 .proc_handler = proc_dointvec,
726 .procname = "tcp_probe_interval",
727 .data = &init_net.ipv4.sysctl_tcp_probe_interval,
728 .maxlen = sizeof(int),
730 .proc_handler = proc_dointvec,
733 .procname = "igmp_link_local_mcast_reports",
734 .data = &init_net.ipv4.sysctl_igmp_llm_reports,
735 .maxlen = sizeof(int),
737 .proc_handler = proc_dointvec
740 .procname = "igmp_max_memberships",
741 .data = &init_net.ipv4.sysctl_igmp_max_memberships,
742 .maxlen = sizeof(int),
744 .proc_handler = proc_dointvec
747 .procname = "igmp_max_msf",
748 .data = &init_net.ipv4.sysctl_igmp_max_msf,
749 .maxlen = sizeof(int),
751 .proc_handler = proc_dointvec
753 #ifdef CONFIG_IP_MULTICAST
755 .procname = "igmp_qrv",
756 .data = &init_net.ipv4.sysctl_igmp_qrv,
757 .maxlen = sizeof(int),
759 .proc_handler = proc_dointvec_minmax,
764 .procname = "tcp_keepalive_time",
765 .data = &init_net.ipv4.sysctl_tcp_keepalive_time,
766 .maxlen = sizeof(int),
768 .proc_handler = proc_dointvec_jiffies,
771 .procname = "tcp_keepalive_probes",
772 .data = &init_net.ipv4.sysctl_tcp_keepalive_probes,
773 .maxlen = sizeof(int),
775 .proc_handler = proc_dointvec
778 .procname = "tcp_keepalive_intvl",
779 .data = &init_net.ipv4.sysctl_tcp_keepalive_intvl,
780 .maxlen = sizeof(int),
782 .proc_handler = proc_dointvec_jiffies,
785 .procname = "tcp_syn_retries",
786 .data = &init_net.ipv4.sysctl_tcp_syn_retries,
787 .maxlen = sizeof(int),
789 .proc_handler = proc_dointvec_minmax,
790 .extra1 = &tcp_syn_retries_min,
791 .extra2 = &tcp_syn_retries_max
794 .procname = "tcp_synack_retries",
795 .data = &init_net.ipv4.sysctl_tcp_synack_retries,
796 .maxlen = sizeof(int),
798 .proc_handler = proc_dointvec
800 #ifdef CONFIG_SYN_COOKIES
802 .procname = "tcp_syncookies",
803 .data = &init_net.ipv4.sysctl_tcp_syncookies,
804 .maxlen = sizeof(int),
806 .proc_handler = proc_dointvec
810 .procname = "tcp_reordering",
811 .data = &init_net.ipv4.sysctl_tcp_reordering,
812 .maxlen = sizeof(int),
814 .proc_handler = proc_dointvec
817 .procname = "tcp_retries1",
818 .data = &init_net.ipv4.sysctl_tcp_retries1,
819 .maxlen = sizeof(int),
821 .proc_handler = proc_dointvec_minmax,
822 .extra2 = &tcp_retr1_max
825 .procname = "tcp_retries2",
826 .data = &init_net.ipv4.sysctl_tcp_retries2,
827 .maxlen = sizeof(int),
829 .proc_handler = proc_dointvec
832 .procname = "tcp_orphan_retries",
833 .data = &init_net.ipv4.sysctl_tcp_orphan_retries,
834 .maxlen = sizeof(int),
836 .proc_handler = proc_dointvec
839 .procname = "tcp_fin_timeout",
840 .data = &init_net.ipv4.sysctl_tcp_fin_timeout,
841 .maxlen = sizeof(int),
843 .proc_handler = proc_dointvec_jiffies,
846 .procname = "tcp_notsent_lowat",
847 .data = &init_net.ipv4.sysctl_tcp_notsent_lowat,
848 .maxlen = sizeof(unsigned int),
850 .proc_handler = proc_douintvec,
853 .procname = "tcp_tw_reuse",
854 .data = &init_net.ipv4.sysctl_tcp_tw_reuse,
855 .maxlen = sizeof(int),
857 .proc_handler = proc_dointvec
860 .procname = "tcp_max_tw_buckets",
861 .data = &init_net.ipv4.tcp_death_row.sysctl_max_tw_buckets,
862 .maxlen = sizeof(int),
864 .proc_handler = proc_dointvec
867 .procname = "tcp_max_syn_backlog",
868 .data = &init_net.ipv4.sysctl_max_syn_backlog,
869 .maxlen = sizeof(int),
871 .proc_handler = proc_dointvec
874 .procname = "tcp_fastopen",
875 .data = &init_net.ipv4.sysctl_tcp_fastopen,
876 .maxlen = sizeof(int),
878 .proc_handler = proc_dointvec,
881 .procname = "tcp_fastopen_key",
883 .data = &init_net.ipv4.sysctl_tcp_fastopen,
884 .maxlen = ((TCP_FASTOPEN_KEY_LENGTH * 2) + 10),
885 .proc_handler = proc_tcp_fastopen_key,
888 .procname = "tcp_fastopen_blackhole_timeout_sec",
889 .data = &init_net.ipv4.sysctl_tcp_fastopen_blackhole_timeout,
890 .maxlen = sizeof(int),
892 .proc_handler = proc_tfo_blackhole_detect_timeout,
895 #ifdef CONFIG_IP_ROUTE_MULTIPATH
897 .procname = "fib_multipath_use_neigh",
898 .data = &init_net.ipv4.sysctl_fib_multipath_use_neigh,
899 .maxlen = sizeof(int),
901 .proc_handler = proc_dointvec_minmax,
906 .procname = "fib_multipath_hash_policy",
907 .data = &init_net.ipv4.sysctl_fib_multipath_hash_policy,
908 .maxlen = sizeof(int),
910 .proc_handler = proc_dointvec_minmax,
916 .procname = "ip_unprivileged_port_start",
917 .maxlen = sizeof(int),
918 .data = &init_net.ipv4.sysctl_ip_prot_sock,
920 .proc_handler = ipv4_privileged_ports,
922 #ifdef CONFIG_NET_L3_MASTER_DEV
924 .procname = "udp_l3mdev_accept",
925 .data = &init_net.ipv4.sysctl_udp_l3mdev_accept,
926 .maxlen = sizeof(int),
928 .proc_handler = proc_dointvec_minmax,
934 .procname = "tcp_sack",
935 .data = &init_net.ipv4.sysctl_tcp_sack,
936 .maxlen = sizeof(int),
938 .proc_handler = proc_dointvec
941 .procname = "tcp_window_scaling",
942 .data = &init_net.ipv4.sysctl_tcp_window_scaling,
943 .maxlen = sizeof(int),
945 .proc_handler = proc_dointvec
948 .procname = "tcp_timestamps",
949 .data = &init_net.ipv4.sysctl_tcp_timestamps,
950 .maxlen = sizeof(int),
952 .proc_handler = proc_dointvec
955 .procname = "tcp_early_retrans",
956 .data = &init_net.ipv4.sysctl_tcp_early_retrans,
957 .maxlen = sizeof(int),
959 .proc_handler = proc_dointvec_minmax,
964 .procname = "tcp_recovery",
965 .data = &init_net.ipv4.sysctl_tcp_recovery,
966 .maxlen = sizeof(int),
968 .proc_handler = proc_dointvec,
971 .procname = "tcp_thin_linear_timeouts",
972 .data = &init_net.ipv4.sysctl_tcp_thin_linear_timeouts,
973 .maxlen = sizeof(int),
975 .proc_handler = proc_dointvec
978 .procname = "tcp_slow_start_after_idle",
979 .data = &init_net.ipv4.sysctl_tcp_slow_start_after_idle,
980 .maxlen = sizeof(int),
982 .proc_handler = proc_dointvec
985 .procname = "tcp_retrans_collapse",
986 .data = &init_net.ipv4.sysctl_tcp_retrans_collapse,
987 .maxlen = sizeof(int),
989 .proc_handler = proc_dointvec
992 .procname = "tcp_stdurg",
993 .data = &init_net.ipv4.sysctl_tcp_stdurg,
994 .maxlen = sizeof(int),
996 .proc_handler = proc_dointvec
999 .procname = "tcp_rfc1337",
1000 .data = &init_net.ipv4.sysctl_tcp_rfc1337,
1001 .maxlen = sizeof(int),
1003 .proc_handler = proc_dointvec
1006 .procname = "tcp_abort_on_overflow",
1007 .data = &init_net.ipv4.sysctl_tcp_abort_on_overflow,
1008 .maxlen = sizeof(int),
1010 .proc_handler = proc_dointvec
1013 .procname = "tcp_fack",
1014 .data = &init_net.ipv4.sysctl_tcp_fack,
1015 .maxlen = sizeof(int),
1017 .proc_handler = proc_dointvec
1020 .procname = "tcp_max_reordering",
1021 .data = &init_net.ipv4.sysctl_tcp_max_reordering,
1022 .maxlen = sizeof(int),
1024 .proc_handler = proc_dointvec
1027 .procname = "tcp_dsack",
1028 .data = &init_net.ipv4.sysctl_tcp_dsack,
1029 .maxlen = sizeof(int),
1031 .proc_handler = proc_dointvec
1034 .procname = "tcp_app_win",
1035 .data = &init_net.ipv4.sysctl_tcp_app_win,
1036 .maxlen = sizeof(int),
1038 .proc_handler = proc_dointvec
1041 .procname = "tcp_adv_win_scale",
1042 .data = &init_net.ipv4.sysctl_tcp_adv_win_scale,
1043 .maxlen = sizeof(int),
1045 .proc_handler = proc_dointvec_minmax,
1046 .extra1 = &tcp_adv_win_scale_min,
1047 .extra2 = &tcp_adv_win_scale_max,
1050 .procname = "tcp_frto",
1051 .data = &init_net.ipv4.sysctl_tcp_frto,
1052 .maxlen = sizeof(int),
1054 .proc_handler = proc_dointvec
1057 .procname = "tcp_no_metrics_save",
1058 .data = &init_net.ipv4.sysctl_tcp_nometrics_save,
1059 .maxlen = sizeof(int),
1061 .proc_handler = proc_dointvec,
1064 .procname = "tcp_moderate_rcvbuf",
1065 .data = &init_net.ipv4.sysctl_tcp_moderate_rcvbuf,
1066 .maxlen = sizeof(int),
1068 .proc_handler = proc_dointvec,
1071 .procname = "tcp_tso_win_divisor",
1072 .data = &init_net.ipv4.sysctl_tcp_tso_win_divisor,
1073 .maxlen = sizeof(int),
1075 .proc_handler = proc_dointvec,
1078 .procname = "tcp_workaround_signed_windows",
1079 .data = &init_net.ipv4.sysctl_tcp_workaround_signed_windows,
1080 .maxlen = sizeof(int),
1082 .proc_handler = proc_dointvec
1085 .procname = "tcp_limit_output_bytes",
1086 .data = &init_net.ipv4.sysctl_tcp_limit_output_bytes,
1087 .maxlen = sizeof(int),
1089 .proc_handler = proc_dointvec
1092 .procname = "tcp_challenge_ack_limit",
1093 .data = &init_net.ipv4.sysctl_tcp_challenge_ack_limit,
1094 .maxlen = sizeof(int),
1096 .proc_handler = proc_dointvec
1099 .procname = "tcp_min_tso_segs",
1100 .data = &init_net.ipv4.sysctl_tcp_min_tso_segs,
1101 .maxlen = sizeof(int),
1103 .proc_handler = proc_dointvec_minmax,
1105 .extra2 = &gso_max_segs,
1108 .procname = "tcp_min_rtt_wlen",
1109 .data = &init_net.ipv4.sysctl_tcp_min_rtt_wlen,
1110 .maxlen = sizeof(int),
1112 .proc_handler = proc_dointvec
1115 .procname = "tcp_autocorking",
1116 .data = &init_net.ipv4.sysctl_tcp_autocorking,
1117 .maxlen = sizeof(int),
1119 .proc_handler = proc_dointvec_minmax,
1124 .procname = "tcp_invalid_ratelimit",
1125 .data = &init_net.ipv4.sysctl_tcp_invalid_ratelimit,
1126 .maxlen = sizeof(int),
1128 .proc_handler = proc_dointvec_ms_jiffies,
1131 .procname = "tcp_pacing_ss_ratio",
1132 .data = &init_net.ipv4.sysctl_tcp_pacing_ss_ratio,
1133 .maxlen = sizeof(int),
1135 .proc_handler = proc_dointvec_minmax,
1137 .extra2 = &thousand,
1140 .procname = "tcp_pacing_ca_ratio",
1141 .data = &init_net.ipv4.sysctl_tcp_pacing_ca_ratio,
1142 .maxlen = sizeof(int),
1144 .proc_handler = proc_dointvec_minmax,
1146 .extra2 = &thousand,
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);