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_min_rtt_wlen",
442 .data = &sysctl_tcp_min_rtt_wlen,
443 .maxlen = sizeof(int),
445 .proc_handler = proc_dointvec
448 .procname = "tcp_low_latency",
449 .data = &sysctl_tcp_low_latency,
450 .maxlen = sizeof(int),
452 .proc_handler = proc_dointvec
455 .procname = "tcp_no_metrics_save",
456 .data = &sysctl_tcp_nometrics_save,
457 .maxlen = sizeof(int),
459 .proc_handler = proc_dointvec,
462 .procname = "tcp_moderate_rcvbuf",
463 .data = &sysctl_tcp_moderate_rcvbuf,
464 .maxlen = sizeof(int),
466 .proc_handler = proc_dointvec,
469 .procname = "tcp_tso_win_divisor",
470 .data = &sysctl_tcp_tso_win_divisor,
471 .maxlen = sizeof(int),
473 .proc_handler = proc_dointvec,
476 .procname = "tcp_congestion_control",
478 .maxlen = TCP_CA_NAME_MAX,
479 .proc_handler = proc_tcp_congestion_control,
482 .procname = "tcp_workaround_signed_windows",
483 .data = &sysctl_tcp_workaround_signed_windows,
484 .maxlen = sizeof(int),
486 .proc_handler = proc_dointvec
489 .procname = "tcp_limit_output_bytes",
490 .data = &sysctl_tcp_limit_output_bytes,
491 .maxlen = sizeof(int),
493 .proc_handler = proc_dointvec
496 .procname = "tcp_challenge_ack_limit",
497 .data = &sysctl_tcp_challenge_ack_limit,
498 .maxlen = sizeof(int),
500 .proc_handler = proc_dointvec
502 #ifdef CONFIG_NETLABEL
504 .procname = "cipso_cache_enable",
505 .data = &cipso_v4_cache_enabled,
506 .maxlen = sizeof(int),
508 .proc_handler = proc_dointvec,
511 .procname = "cipso_cache_bucket_size",
512 .data = &cipso_v4_cache_bucketsize,
513 .maxlen = sizeof(int),
515 .proc_handler = proc_dointvec,
518 .procname = "cipso_rbm_optfmt",
519 .data = &cipso_v4_rbm_optfmt,
520 .maxlen = sizeof(int),
522 .proc_handler = proc_dointvec,
525 .procname = "cipso_rbm_strictvalid",
526 .data = &cipso_v4_rbm_strictvalid,
527 .maxlen = sizeof(int),
529 .proc_handler = proc_dointvec,
531 #endif /* CONFIG_NETLABEL */
533 .procname = "tcp_available_congestion_control",
534 .maxlen = TCP_CA_BUF_MAX,
536 .proc_handler = proc_tcp_available_congestion_control,
539 .procname = "tcp_allowed_congestion_control",
540 .maxlen = TCP_CA_BUF_MAX,
542 .proc_handler = proc_allowed_congestion_control,
545 .procname = "tcp_min_tso_segs",
546 .data = &sysctl_tcp_min_tso_segs,
547 .maxlen = sizeof(int),
549 .proc_handler = proc_dointvec_minmax,
551 .extra2 = &gso_max_segs,
554 .procname = "tcp_pacing_ss_ratio",
555 .data = &sysctl_tcp_pacing_ss_ratio,
556 .maxlen = sizeof(int),
558 .proc_handler = proc_dointvec_minmax,
563 .procname = "tcp_pacing_ca_ratio",
564 .data = &sysctl_tcp_pacing_ca_ratio,
565 .maxlen = sizeof(int),
567 .proc_handler = proc_dointvec_minmax,
572 .procname = "tcp_autocorking",
573 .data = &sysctl_tcp_autocorking,
574 .maxlen = sizeof(int),
576 .proc_handler = proc_dointvec_minmax,
581 .procname = "tcp_invalid_ratelimit",
582 .data = &sysctl_tcp_invalid_ratelimit,
583 .maxlen = sizeof(int),
585 .proc_handler = proc_dointvec_ms_jiffies,
588 .procname = "tcp_available_ulp",
589 .maxlen = TCP_ULP_BUF_MAX,
591 .proc_handler = proc_tcp_available_ulp,
594 .procname = "icmp_msgs_per_sec",
595 .data = &sysctl_icmp_msgs_per_sec,
596 .maxlen = sizeof(int),
598 .proc_handler = proc_dointvec_minmax,
602 .procname = "icmp_msgs_burst",
603 .data = &sysctl_icmp_msgs_burst,
604 .maxlen = sizeof(int),
606 .proc_handler = proc_dointvec_minmax,
610 .procname = "udp_mem",
611 .data = &sysctl_udp_mem,
612 .maxlen = sizeof(sysctl_udp_mem),
614 .proc_handler = proc_doulongvec_minmax,
617 .procname = "udp_rmem_min",
618 .data = &sysctl_udp_rmem_min,
619 .maxlen = sizeof(sysctl_udp_rmem_min),
621 .proc_handler = proc_dointvec_minmax,
625 .procname = "udp_wmem_min",
626 .data = &sysctl_udp_wmem_min,
627 .maxlen = sizeof(sysctl_udp_wmem_min),
629 .proc_handler = proc_dointvec_minmax,
635 static struct ctl_table ipv4_net_table[] = {
637 .procname = "icmp_echo_ignore_all",
638 .data = &init_net.ipv4.sysctl_icmp_echo_ignore_all,
639 .maxlen = sizeof(int),
641 .proc_handler = proc_dointvec
644 .procname = "icmp_echo_ignore_broadcasts",
645 .data = &init_net.ipv4.sysctl_icmp_echo_ignore_broadcasts,
646 .maxlen = sizeof(int),
648 .proc_handler = proc_dointvec
651 .procname = "icmp_ignore_bogus_error_responses",
652 .data = &init_net.ipv4.sysctl_icmp_ignore_bogus_error_responses,
653 .maxlen = sizeof(int),
655 .proc_handler = proc_dointvec
658 .procname = "icmp_errors_use_inbound_ifaddr",
659 .data = &init_net.ipv4.sysctl_icmp_errors_use_inbound_ifaddr,
660 .maxlen = sizeof(int),
662 .proc_handler = proc_dointvec
665 .procname = "icmp_ratelimit",
666 .data = &init_net.ipv4.sysctl_icmp_ratelimit,
667 .maxlen = sizeof(int),
669 .proc_handler = proc_dointvec_ms_jiffies,
672 .procname = "icmp_ratemask",
673 .data = &init_net.ipv4.sysctl_icmp_ratemask,
674 .maxlen = sizeof(int),
676 .proc_handler = proc_dointvec
679 .procname = "ping_group_range",
680 .data = &init_net.ipv4.ping_group_range.range,
681 .maxlen = sizeof(gid_t)*2,
683 .proc_handler = ipv4_ping_group_range,
686 .procname = "tcp_ecn",
687 .data = &init_net.ipv4.sysctl_tcp_ecn,
688 .maxlen = sizeof(int),
690 .proc_handler = proc_dointvec
693 .procname = "tcp_ecn_fallback",
694 .data = &init_net.ipv4.sysctl_tcp_ecn_fallback,
695 .maxlen = sizeof(int),
697 .proc_handler = proc_dointvec
700 .procname = "ip_dynaddr",
701 .data = &init_net.ipv4.sysctl_ip_dynaddr,
702 .maxlen = sizeof(int),
704 .proc_handler = proc_dointvec
707 .procname = "ip_early_demux",
708 .data = &init_net.ipv4.sysctl_ip_early_demux,
709 .maxlen = sizeof(int),
711 .proc_handler = proc_dointvec
714 .procname = "udp_early_demux",
715 .data = &init_net.ipv4.sysctl_udp_early_demux,
716 .maxlen = sizeof(int),
718 .proc_handler = proc_udp_early_demux
721 .procname = "tcp_early_demux",
722 .data = &init_net.ipv4.sysctl_tcp_early_demux,
723 .maxlen = sizeof(int),
725 .proc_handler = proc_tcp_early_demux
728 .procname = "ip_default_ttl",
729 .data = &init_net.ipv4.sysctl_ip_default_ttl,
730 .maxlen = sizeof(int),
732 .proc_handler = proc_dointvec_minmax,
733 .extra1 = &ip_ttl_min,
734 .extra2 = &ip_ttl_max,
737 .procname = "ip_local_port_range",
738 .maxlen = sizeof(init_net.ipv4.ip_local_ports.range),
739 .data = &init_net.ipv4.ip_local_ports.range,
741 .proc_handler = ipv4_local_port_range,
744 .procname = "ip_local_reserved_ports",
745 .data = &init_net.ipv4.sysctl_local_reserved_ports,
748 .proc_handler = proc_do_large_bitmap,
751 .procname = "ip_no_pmtu_disc",
752 .data = &init_net.ipv4.sysctl_ip_no_pmtu_disc,
753 .maxlen = sizeof(int),
755 .proc_handler = proc_dointvec
758 .procname = "ip_forward_use_pmtu",
759 .data = &init_net.ipv4.sysctl_ip_fwd_use_pmtu,
760 .maxlen = sizeof(int),
762 .proc_handler = proc_dointvec,
765 .procname = "ip_nonlocal_bind",
766 .data = &init_net.ipv4.sysctl_ip_nonlocal_bind,
767 .maxlen = sizeof(int),
769 .proc_handler = proc_dointvec
772 .procname = "fwmark_reflect",
773 .data = &init_net.ipv4.sysctl_fwmark_reflect,
774 .maxlen = sizeof(int),
776 .proc_handler = proc_dointvec,
779 .procname = "tcp_fwmark_accept",
780 .data = &init_net.ipv4.sysctl_tcp_fwmark_accept,
781 .maxlen = sizeof(int),
783 .proc_handler = proc_dointvec,
785 #ifdef CONFIG_NET_L3_MASTER_DEV
787 .procname = "tcp_l3mdev_accept",
788 .data = &init_net.ipv4.sysctl_tcp_l3mdev_accept,
789 .maxlen = sizeof(int),
791 .proc_handler = proc_dointvec_minmax,
797 .procname = "tcp_mtu_probing",
798 .data = &init_net.ipv4.sysctl_tcp_mtu_probing,
799 .maxlen = sizeof(int),
801 .proc_handler = proc_dointvec,
804 .procname = "tcp_base_mss",
805 .data = &init_net.ipv4.sysctl_tcp_base_mss,
806 .maxlen = sizeof(int),
808 .proc_handler = proc_dointvec,
811 .procname = "tcp_probe_threshold",
812 .data = &init_net.ipv4.sysctl_tcp_probe_threshold,
813 .maxlen = sizeof(int),
815 .proc_handler = proc_dointvec,
818 .procname = "tcp_probe_interval",
819 .data = &init_net.ipv4.sysctl_tcp_probe_interval,
820 .maxlen = sizeof(int),
822 .proc_handler = proc_dointvec,
825 .procname = "igmp_link_local_mcast_reports",
826 .data = &init_net.ipv4.sysctl_igmp_llm_reports,
827 .maxlen = sizeof(int),
829 .proc_handler = proc_dointvec
832 .procname = "igmp_max_memberships",
833 .data = &init_net.ipv4.sysctl_igmp_max_memberships,
834 .maxlen = sizeof(int),
836 .proc_handler = proc_dointvec
839 .procname = "igmp_max_msf",
840 .data = &init_net.ipv4.sysctl_igmp_max_msf,
841 .maxlen = sizeof(int),
843 .proc_handler = proc_dointvec
845 #ifdef CONFIG_IP_MULTICAST
847 .procname = "igmp_qrv",
848 .data = &init_net.ipv4.sysctl_igmp_qrv,
849 .maxlen = sizeof(int),
851 .proc_handler = proc_dointvec_minmax,
856 .procname = "tcp_keepalive_time",
857 .data = &init_net.ipv4.sysctl_tcp_keepalive_time,
858 .maxlen = sizeof(int),
860 .proc_handler = proc_dointvec_jiffies,
863 .procname = "tcp_keepalive_probes",
864 .data = &init_net.ipv4.sysctl_tcp_keepalive_probes,
865 .maxlen = sizeof(int),
867 .proc_handler = proc_dointvec
870 .procname = "tcp_keepalive_intvl",
871 .data = &init_net.ipv4.sysctl_tcp_keepalive_intvl,
872 .maxlen = sizeof(int),
874 .proc_handler = proc_dointvec_jiffies,
877 .procname = "tcp_syn_retries",
878 .data = &init_net.ipv4.sysctl_tcp_syn_retries,
879 .maxlen = sizeof(int),
881 .proc_handler = proc_dointvec_minmax,
882 .extra1 = &tcp_syn_retries_min,
883 .extra2 = &tcp_syn_retries_max
886 .procname = "tcp_synack_retries",
887 .data = &init_net.ipv4.sysctl_tcp_synack_retries,
888 .maxlen = sizeof(int),
890 .proc_handler = proc_dointvec
892 #ifdef CONFIG_SYN_COOKIES
894 .procname = "tcp_syncookies",
895 .data = &init_net.ipv4.sysctl_tcp_syncookies,
896 .maxlen = sizeof(int),
898 .proc_handler = proc_dointvec
902 .procname = "tcp_reordering",
903 .data = &init_net.ipv4.sysctl_tcp_reordering,
904 .maxlen = sizeof(int),
906 .proc_handler = proc_dointvec
909 .procname = "tcp_retries1",
910 .data = &init_net.ipv4.sysctl_tcp_retries1,
911 .maxlen = sizeof(int),
913 .proc_handler = proc_dointvec_minmax,
914 .extra2 = &tcp_retr1_max
917 .procname = "tcp_retries2",
918 .data = &init_net.ipv4.sysctl_tcp_retries2,
919 .maxlen = sizeof(int),
921 .proc_handler = proc_dointvec
924 .procname = "tcp_orphan_retries",
925 .data = &init_net.ipv4.sysctl_tcp_orphan_retries,
926 .maxlen = sizeof(int),
928 .proc_handler = proc_dointvec
931 .procname = "tcp_fin_timeout",
932 .data = &init_net.ipv4.sysctl_tcp_fin_timeout,
933 .maxlen = sizeof(int),
935 .proc_handler = proc_dointvec_jiffies,
938 .procname = "tcp_notsent_lowat",
939 .data = &init_net.ipv4.sysctl_tcp_notsent_lowat,
940 .maxlen = sizeof(unsigned int),
942 .proc_handler = proc_douintvec,
945 .procname = "tcp_tw_reuse",
946 .data = &init_net.ipv4.sysctl_tcp_tw_reuse,
947 .maxlen = sizeof(int),
949 .proc_handler = proc_dointvec
952 .procname = "tcp_max_tw_buckets",
953 .data = &init_net.ipv4.tcp_death_row.sysctl_max_tw_buckets,
954 .maxlen = sizeof(int),
956 .proc_handler = proc_dointvec
959 .procname = "tcp_max_syn_backlog",
960 .data = &init_net.ipv4.sysctl_max_syn_backlog,
961 .maxlen = sizeof(int),
963 .proc_handler = proc_dointvec
966 .procname = "tcp_fastopen",
967 .data = &init_net.ipv4.sysctl_tcp_fastopen,
968 .maxlen = sizeof(int),
970 .proc_handler = proc_dointvec,
973 .procname = "tcp_fastopen_key",
975 .data = &init_net.ipv4.sysctl_tcp_fastopen,
976 .maxlen = ((TCP_FASTOPEN_KEY_LENGTH * 2) + 10),
977 .proc_handler = proc_tcp_fastopen_key,
980 .procname = "tcp_fastopen_blackhole_timeout_sec",
981 .data = &init_net.ipv4.sysctl_tcp_fastopen_blackhole_timeout,
982 .maxlen = sizeof(int),
984 .proc_handler = proc_tfo_blackhole_detect_timeout,
987 #ifdef CONFIG_IP_ROUTE_MULTIPATH
989 .procname = "fib_multipath_use_neigh",
990 .data = &init_net.ipv4.sysctl_fib_multipath_use_neigh,
991 .maxlen = sizeof(int),
993 .proc_handler = proc_dointvec_minmax,
998 .procname = "fib_multipath_hash_policy",
999 .data = &init_net.ipv4.sysctl_fib_multipath_hash_policy,
1000 .maxlen = sizeof(int),
1002 .proc_handler = proc_dointvec_minmax,
1008 .procname = "ip_unprivileged_port_start",
1009 .maxlen = sizeof(int),
1010 .data = &init_net.ipv4.sysctl_ip_prot_sock,
1012 .proc_handler = ipv4_privileged_ports,
1014 #ifdef CONFIG_NET_L3_MASTER_DEV
1016 .procname = "udp_l3mdev_accept",
1017 .data = &init_net.ipv4.sysctl_udp_l3mdev_accept,
1018 .maxlen = sizeof(int),
1020 .proc_handler = proc_dointvec_minmax,
1026 .procname = "tcp_sack",
1027 .data = &init_net.ipv4.sysctl_tcp_sack,
1028 .maxlen = sizeof(int),
1030 .proc_handler = proc_dointvec
1033 .procname = "tcp_window_scaling",
1034 .data = &init_net.ipv4.sysctl_tcp_window_scaling,
1035 .maxlen = sizeof(int),
1037 .proc_handler = proc_dointvec
1040 .procname = "tcp_timestamps",
1041 .data = &init_net.ipv4.sysctl_tcp_timestamps,
1042 .maxlen = sizeof(int),
1044 .proc_handler = proc_dointvec
1047 .procname = "tcp_early_retrans",
1048 .data = &init_net.ipv4.sysctl_tcp_early_retrans,
1049 .maxlen = sizeof(int),
1051 .proc_handler = proc_dointvec_minmax,
1056 .procname = "tcp_recovery",
1057 .data = &init_net.ipv4.sysctl_tcp_recovery,
1058 .maxlen = sizeof(int),
1060 .proc_handler = proc_dointvec,
1063 .procname = "tcp_thin_linear_timeouts",
1064 .data = &init_net.ipv4.sysctl_tcp_thin_linear_timeouts,
1065 .maxlen = sizeof(int),
1067 .proc_handler = proc_dointvec
1070 .procname = "tcp_slow_start_after_idle",
1071 .data = &init_net.ipv4.sysctl_tcp_slow_start_after_idle,
1072 .maxlen = sizeof(int),
1074 .proc_handler = proc_dointvec
1077 .procname = "tcp_retrans_collapse",
1078 .data = &init_net.ipv4.sysctl_tcp_retrans_collapse,
1079 .maxlen = sizeof(int),
1081 .proc_handler = proc_dointvec
1084 .procname = "tcp_stdurg",
1085 .data = &init_net.ipv4.sysctl_tcp_stdurg,
1086 .maxlen = sizeof(int),
1088 .proc_handler = proc_dointvec
1091 .procname = "tcp_rfc1337",
1092 .data = &init_net.ipv4.sysctl_tcp_rfc1337,
1093 .maxlen = sizeof(int),
1095 .proc_handler = proc_dointvec
1098 .procname = "tcp_abort_on_overflow",
1099 .data = &init_net.ipv4.sysctl_tcp_abort_on_overflow,
1100 .maxlen = sizeof(int),
1102 .proc_handler = proc_dointvec
1105 .procname = "tcp_fack",
1106 .data = &init_net.ipv4.sysctl_tcp_fack,
1107 .maxlen = sizeof(int),
1109 .proc_handler = proc_dointvec
1112 .procname = "tcp_max_reordering",
1113 .data = &init_net.ipv4.sysctl_tcp_max_reordering,
1114 .maxlen = sizeof(int),
1116 .proc_handler = proc_dointvec
1119 .procname = "tcp_dsack",
1120 .data = &init_net.ipv4.sysctl_tcp_dsack,
1121 .maxlen = sizeof(int),
1123 .proc_handler = proc_dointvec
1126 .procname = "tcp_app_win",
1127 .data = &init_net.ipv4.sysctl_tcp_app_win,
1128 .maxlen = sizeof(int),
1130 .proc_handler = proc_dointvec
1133 .procname = "tcp_adv_win_scale",
1134 .data = &init_net.ipv4.sysctl_tcp_adv_win_scale,
1135 .maxlen = sizeof(int),
1137 .proc_handler = proc_dointvec_minmax,
1138 .extra1 = &tcp_adv_win_scale_min,
1139 .extra2 = &tcp_adv_win_scale_max,
1142 .procname = "tcp_frto",
1143 .data = &init_net.ipv4.sysctl_tcp_frto,
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);