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_adv_win_scale",
442 .data = &sysctl_tcp_adv_win_scale,
443 .maxlen = sizeof(int),
445 .proc_handler = proc_dointvec_minmax,
446 .extra1 = &tcp_adv_win_scale_min,
447 .extra2 = &tcp_adv_win_scale_max,
450 .procname = "tcp_frto",
451 .data = &sysctl_tcp_frto,
452 .maxlen = sizeof(int),
454 .proc_handler = proc_dointvec
457 .procname = "tcp_min_rtt_wlen",
458 .data = &sysctl_tcp_min_rtt_wlen,
459 .maxlen = sizeof(int),
461 .proc_handler = proc_dointvec
464 .procname = "tcp_low_latency",
465 .data = &sysctl_tcp_low_latency,
466 .maxlen = sizeof(int),
468 .proc_handler = proc_dointvec
471 .procname = "tcp_no_metrics_save",
472 .data = &sysctl_tcp_nometrics_save,
473 .maxlen = sizeof(int),
475 .proc_handler = proc_dointvec,
478 .procname = "tcp_moderate_rcvbuf",
479 .data = &sysctl_tcp_moderate_rcvbuf,
480 .maxlen = sizeof(int),
482 .proc_handler = proc_dointvec,
485 .procname = "tcp_tso_win_divisor",
486 .data = &sysctl_tcp_tso_win_divisor,
487 .maxlen = sizeof(int),
489 .proc_handler = proc_dointvec,
492 .procname = "tcp_congestion_control",
494 .maxlen = TCP_CA_NAME_MAX,
495 .proc_handler = proc_tcp_congestion_control,
498 .procname = "tcp_workaround_signed_windows",
499 .data = &sysctl_tcp_workaround_signed_windows,
500 .maxlen = sizeof(int),
502 .proc_handler = proc_dointvec
505 .procname = "tcp_limit_output_bytes",
506 .data = &sysctl_tcp_limit_output_bytes,
507 .maxlen = sizeof(int),
509 .proc_handler = proc_dointvec
512 .procname = "tcp_challenge_ack_limit",
513 .data = &sysctl_tcp_challenge_ack_limit,
514 .maxlen = sizeof(int),
516 .proc_handler = proc_dointvec
518 #ifdef CONFIG_NETLABEL
520 .procname = "cipso_cache_enable",
521 .data = &cipso_v4_cache_enabled,
522 .maxlen = sizeof(int),
524 .proc_handler = proc_dointvec,
527 .procname = "cipso_cache_bucket_size",
528 .data = &cipso_v4_cache_bucketsize,
529 .maxlen = sizeof(int),
531 .proc_handler = proc_dointvec,
534 .procname = "cipso_rbm_optfmt",
535 .data = &cipso_v4_rbm_optfmt,
536 .maxlen = sizeof(int),
538 .proc_handler = proc_dointvec,
541 .procname = "cipso_rbm_strictvalid",
542 .data = &cipso_v4_rbm_strictvalid,
543 .maxlen = sizeof(int),
545 .proc_handler = proc_dointvec,
547 #endif /* CONFIG_NETLABEL */
549 .procname = "tcp_available_congestion_control",
550 .maxlen = TCP_CA_BUF_MAX,
552 .proc_handler = proc_tcp_available_congestion_control,
555 .procname = "tcp_allowed_congestion_control",
556 .maxlen = TCP_CA_BUF_MAX,
558 .proc_handler = proc_allowed_congestion_control,
561 .procname = "tcp_min_tso_segs",
562 .data = &sysctl_tcp_min_tso_segs,
563 .maxlen = sizeof(int),
565 .proc_handler = proc_dointvec_minmax,
567 .extra2 = &gso_max_segs,
570 .procname = "tcp_pacing_ss_ratio",
571 .data = &sysctl_tcp_pacing_ss_ratio,
572 .maxlen = sizeof(int),
574 .proc_handler = proc_dointvec_minmax,
579 .procname = "tcp_pacing_ca_ratio",
580 .data = &sysctl_tcp_pacing_ca_ratio,
581 .maxlen = sizeof(int),
583 .proc_handler = proc_dointvec_minmax,
588 .procname = "tcp_autocorking",
589 .data = &sysctl_tcp_autocorking,
590 .maxlen = sizeof(int),
592 .proc_handler = proc_dointvec_minmax,
597 .procname = "tcp_invalid_ratelimit",
598 .data = &sysctl_tcp_invalid_ratelimit,
599 .maxlen = sizeof(int),
601 .proc_handler = proc_dointvec_ms_jiffies,
604 .procname = "tcp_available_ulp",
605 .maxlen = TCP_ULP_BUF_MAX,
607 .proc_handler = proc_tcp_available_ulp,
610 .procname = "icmp_msgs_per_sec",
611 .data = &sysctl_icmp_msgs_per_sec,
612 .maxlen = sizeof(int),
614 .proc_handler = proc_dointvec_minmax,
618 .procname = "icmp_msgs_burst",
619 .data = &sysctl_icmp_msgs_burst,
620 .maxlen = sizeof(int),
622 .proc_handler = proc_dointvec_minmax,
626 .procname = "udp_mem",
627 .data = &sysctl_udp_mem,
628 .maxlen = sizeof(sysctl_udp_mem),
630 .proc_handler = proc_doulongvec_minmax,
633 .procname = "udp_rmem_min",
634 .data = &sysctl_udp_rmem_min,
635 .maxlen = sizeof(sysctl_udp_rmem_min),
637 .proc_handler = proc_dointvec_minmax,
641 .procname = "udp_wmem_min",
642 .data = &sysctl_udp_wmem_min,
643 .maxlen = sizeof(sysctl_udp_wmem_min),
645 .proc_handler = proc_dointvec_minmax,
651 static struct ctl_table ipv4_net_table[] = {
653 .procname = "icmp_echo_ignore_all",
654 .data = &init_net.ipv4.sysctl_icmp_echo_ignore_all,
655 .maxlen = sizeof(int),
657 .proc_handler = proc_dointvec
660 .procname = "icmp_echo_ignore_broadcasts",
661 .data = &init_net.ipv4.sysctl_icmp_echo_ignore_broadcasts,
662 .maxlen = sizeof(int),
664 .proc_handler = proc_dointvec
667 .procname = "icmp_ignore_bogus_error_responses",
668 .data = &init_net.ipv4.sysctl_icmp_ignore_bogus_error_responses,
669 .maxlen = sizeof(int),
671 .proc_handler = proc_dointvec
674 .procname = "icmp_errors_use_inbound_ifaddr",
675 .data = &init_net.ipv4.sysctl_icmp_errors_use_inbound_ifaddr,
676 .maxlen = sizeof(int),
678 .proc_handler = proc_dointvec
681 .procname = "icmp_ratelimit",
682 .data = &init_net.ipv4.sysctl_icmp_ratelimit,
683 .maxlen = sizeof(int),
685 .proc_handler = proc_dointvec_ms_jiffies,
688 .procname = "icmp_ratemask",
689 .data = &init_net.ipv4.sysctl_icmp_ratemask,
690 .maxlen = sizeof(int),
692 .proc_handler = proc_dointvec
695 .procname = "ping_group_range",
696 .data = &init_net.ipv4.ping_group_range.range,
697 .maxlen = sizeof(gid_t)*2,
699 .proc_handler = ipv4_ping_group_range,
702 .procname = "tcp_ecn",
703 .data = &init_net.ipv4.sysctl_tcp_ecn,
704 .maxlen = sizeof(int),
706 .proc_handler = proc_dointvec
709 .procname = "tcp_ecn_fallback",
710 .data = &init_net.ipv4.sysctl_tcp_ecn_fallback,
711 .maxlen = sizeof(int),
713 .proc_handler = proc_dointvec
716 .procname = "ip_dynaddr",
717 .data = &init_net.ipv4.sysctl_ip_dynaddr,
718 .maxlen = sizeof(int),
720 .proc_handler = proc_dointvec
723 .procname = "ip_early_demux",
724 .data = &init_net.ipv4.sysctl_ip_early_demux,
725 .maxlen = sizeof(int),
727 .proc_handler = proc_dointvec
730 .procname = "udp_early_demux",
731 .data = &init_net.ipv4.sysctl_udp_early_demux,
732 .maxlen = sizeof(int),
734 .proc_handler = proc_udp_early_demux
737 .procname = "tcp_early_demux",
738 .data = &init_net.ipv4.sysctl_tcp_early_demux,
739 .maxlen = sizeof(int),
741 .proc_handler = proc_tcp_early_demux
744 .procname = "ip_default_ttl",
745 .data = &init_net.ipv4.sysctl_ip_default_ttl,
746 .maxlen = sizeof(int),
748 .proc_handler = proc_dointvec_minmax,
749 .extra1 = &ip_ttl_min,
750 .extra2 = &ip_ttl_max,
753 .procname = "ip_local_port_range",
754 .maxlen = sizeof(init_net.ipv4.ip_local_ports.range),
755 .data = &init_net.ipv4.ip_local_ports.range,
757 .proc_handler = ipv4_local_port_range,
760 .procname = "ip_local_reserved_ports",
761 .data = &init_net.ipv4.sysctl_local_reserved_ports,
764 .proc_handler = proc_do_large_bitmap,
767 .procname = "ip_no_pmtu_disc",
768 .data = &init_net.ipv4.sysctl_ip_no_pmtu_disc,
769 .maxlen = sizeof(int),
771 .proc_handler = proc_dointvec
774 .procname = "ip_forward_use_pmtu",
775 .data = &init_net.ipv4.sysctl_ip_fwd_use_pmtu,
776 .maxlen = sizeof(int),
778 .proc_handler = proc_dointvec,
781 .procname = "ip_nonlocal_bind",
782 .data = &init_net.ipv4.sysctl_ip_nonlocal_bind,
783 .maxlen = sizeof(int),
785 .proc_handler = proc_dointvec
788 .procname = "fwmark_reflect",
789 .data = &init_net.ipv4.sysctl_fwmark_reflect,
790 .maxlen = sizeof(int),
792 .proc_handler = proc_dointvec,
795 .procname = "tcp_fwmark_accept",
796 .data = &init_net.ipv4.sysctl_tcp_fwmark_accept,
797 .maxlen = sizeof(int),
799 .proc_handler = proc_dointvec,
801 #ifdef CONFIG_NET_L3_MASTER_DEV
803 .procname = "tcp_l3mdev_accept",
804 .data = &init_net.ipv4.sysctl_tcp_l3mdev_accept,
805 .maxlen = sizeof(int),
807 .proc_handler = proc_dointvec_minmax,
813 .procname = "tcp_mtu_probing",
814 .data = &init_net.ipv4.sysctl_tcp_mtu_probing,
815 .maxlen = sizeof(int),
817 .proc_handler = proc_dointvec,
820 .procname = "tcp_base_mss",
821 .data = &init_net.ipv4.sysctl_tcp_base_mss,
822 .maxlen = sizeof(int),
824 .proc_handler = proc_dointvec,
827 .procname = "tcp_probe_threshold",
828 .data = &init_net.ipv4.sysctl_tcp_probe_threshold,
829 .maxlen = sizeof(int),
831 .proc_handler = proc_dointvec,
834 .procname = "tcp_probe_interval",
835 .data = &init_net.ipv4.sysctl_tcp_probe_interval,
836 .maxlen = sizeof(int),
838 .proc_handler = proc_dointvec,
841 .procname = "igmp_link_local_mcast_reports",
842 .data = &init_net.ipv4.sysctl_igmp_llm_reports,
843 .maxlen = sizeof(int),
845 .proc_handler = proc_dointvec
848 .procname = "igmp_max_memberships",
849 .data = &init_net.ipv4.sysctl_igmp_max_memberships,
850 .maxlen = sizeof(int),
852 .proc_handler = proc_dointvec
855 .procname = "igmp_max_msf",
856 .data = &init_net.ipv4.sysctl_igmp_max_msf,
857 .maxlen = sizeof(int),
859 .proc_handler = proc_dointvec
861 #ifdef CONFIG_IP_MULTICAST
863 .procname = "igmp_qrv",
864 .data = &init_net.ipv4.sysctl_igmp_qrv,
865 .maxlen = sizeof(int),
867 .proc_handler = proc_dointvec_minmax,
872 .procname = "tcp_keepalive_time",
873 .data = &init_net.ipv4.sysctl_tcp_keepalive_time,
874 .maxlen = sizeof(int),
876 .proc_handler = proc_dointvec_jiffies,
879 .procname = "tcp_keepalive_probes",
880 .data = &init_net.ipv4.sysctl_tcp_keepalive_probes,
881 .maxlen = sizeof(int),
883 .proc_handler = proc_dointvec
886 .procname = "tcp_keepalive_intvl",
887 .data = &init_net.ipv4.sysctl_tcp_keepalive_intvl,
888 .maxlen = sizeof(int),
890 .proc_handler = proc_dointvec_jiffies,
893 .procname = "tcp_syn_retries",
894 .data = &init_net.ipv4.sysctl_tcp_syn_retries,
895 .maxlen = sizeof(int),
897 .proc_handler = proc_dointvec_minmax,
898 .extra1 = &tcp_syn_retries_min,
899 .extra2 = &tcp_syn_retries_max
902 .procname = "tcp_synack_retries",
903 .data = &init_net.ipv4.sysctl_tcp_synack_retries,
904 .maxlen = sizeof(int),
906 .proc_handler = proc_dointvec
908 #ifdef CONFIG_SYN_COOKIES
910 .procname = "tcp_syncookies",
911 .data = &init_net.ipv4.sysctl_tcp_syncookies,
912 .maxlen = sizeof(int),
914 .proc_handler = proc_dointvec
918 .procname = "tcp_reordering",
919 .data = &init_net.ipv4.sysctl_tcp_reordering,
920 .maxlen = sizeof(int),
922 .proc_handler = proc_dointvec
925 .procname = "tcp_retries1",
926 .data = &init_net.ipv4.sysctl_tcp_retries1,
927 .maxlen = sizeof(int),
929 .proc_handler = proc_dointvec_minmax,
930 .extra2 = &tcp_retr1_max
933 .procname = "tcp_retries2",
934 .data = &init_net.ipv4.sysctl_tcp_retries2,
935 .maxlen = sizeof(int),
937 .proc_handler = proc_dointvec
940 .procname = "tcp_orphan_retries",
941 .data = &init_net.ipv4.sysctl_tcp_orphan_retries,
942 .maxlen = sizeof(int),
944 .proc_handler = proc_dointvec
947 .procname = "tcp_fin_timeout",
948 .data = &init_net.ipv4.sysctl_tcp_fin_timeout,
949 .maxlen = sizeof(int),
951 .proc_handler = proc_dointvec_jiffies,
954 .procname = "tcp_notsent_lowat",
955 .data = &init_net.ipv4.sysctl_tcp_notsent_lowat,
956 .maxlen = sizeof(unsigned int),
958 .proc_handler = proc_douintvec,
961 .procname = "tcp_tw_reuse",
962 .data = &init_net.ipv4.sysctl_tcp_tw_reuse,
963 .maxlen = sizeof(int),
965 .proc_handler = proc_dointvec
968 .procname = "tcp_max_tw_buckets",
969 .data = &init_net.ipv4.tcp_death_row.sysctl_max_tw_buckets,
970 .maxlen = sizeof(int),
972 .proc_handler = proc_dointvec
975 .procname = "tcp_max_syn_backlog",
976 .data = &init_net.ipv4.sysctl_max_syn_backlog,
977 .maxlen = sizeof(int),
979 .proc_handler = proc_dointvec
982 .procname = "tcp_fastopen",
983 .data = &init_net.ipv4.sysctl_tcp_fastopen,
984 .maxlen = sizeof(int),
986 .proc_handler = proc_dointvec,
989 .procname = "tcp_fastopen_key",
991 .data = &init_net.ipv4.sysctl_tcp_fastopen,
992 .maxlen = ((TCP_FASTOPEN_KEY_LENGTH * 2) + 10),
993 .proc_handler = proc_tcp_fastopen_key,
996 .procname = "tcp_fastopen_blackhole_timeout_sec",
997 .data = &init_net.ipv4.sysctl_tcp_fastopen_blackhole_timeout,
998 .maxlen = sizeof(int),
1000 .proc_handler = proc_tfo_blackhole_detect_timeout,
1003 #ifdef CONFIG_IP_ROUTE_MULTIPATH
1005 .procname = "fib_multipath_use_neigh",
1006 .data = &init_net.ipv4.sysctl_fib_multipath_use_neigh,
1007 .maxlen = sizeof(int),
1009 .proc_handler = proc_dointvec_minmax,
1014 .procname = "fib_multipath_hash_policy",
1015 .data = &init_net.ipv4.sysctl_fib_multipath_hash_policy,
1016 .maxlen = sizeof(int),
1018 .proc_handler = proc_dointvec_minmax,
1024 .procname = "ip_unprivileged_port_start",
1025 .maxlen = sizeof(int),
1026 .data = &init_net.ipv4.sysctl_ip_prot_sock,
1028 .proc_handler = ipv4_privileged_ports,
1030 #ifdef CONFIG_NET_L3_MASTER_DEV
1032 .procname = "udp_l3mdev_accept",
1033 .data = &init_net.ipv4.sysctl_udp_l3mdev_accept,
1034 .maxlen = sizeof(int),
1036 .proc_handler = proc_dointvec_minmax,
1042 .procname = "tcp_sack",
1043 .data = &init_net.ipv4.sysctl_tcp_sack,
1044 .maxlen = sizeof(int),
1046 .proc_handler = proc_dointvec
1049 .procname = "tcp_window_scaling",
1050 .data = &init_net.ipv4.sysctl_tcp_window_scaling,
1051 .maxlen = sizeof(int),
1053 .proc_handler = proc_dointvec
1056 .procname = "tcp_timestamps",
1057 .data = &init_net.ipv4.sysctl_tcp_timestamps,
1058 .maxlen = sizeof(int),
1060 .proc_handler = proc_dointvec
1063 .procname = "tcp_early_retrans",
1064 .data = &init_net.ipv4.sysctl_tcp_early_retrans,
1065 .maxlen = sizeof(int),
1067 .proc_handler = proc_dointvec_minmax,
1072 .procname = "tcp_recovery",
1073 .data = &init_net.ipv4.sysctl_tcp_recovery,
1074 .maxlen = sizeof(int),
1076 .proc_handler = proc_dointvec,
1079 .procname = "tcp_thin_linear_timeouts",
1080 .data = &init_net.ipv4.sysctl_tcp_thin_linear_timeouts,
1081 .maxlen = sizeof(int),
1083 .proc_handler = proc_dointvec
1086 .procname = "tcp_slow_start_after_idle",
1087 .data = &init_net.ipv4.sysctl_tcp_slow_start_after_idle,
1088 .maxlen = sizeof(int),
1090 .proc_handler = proc_dointvec
1093 .procname = "tcp_retrans_collapse",
1094 .data = &init_net.ipv4.sysctl_tcp_retrans_collapse,
1095 .maxlen = sizeof(int),
1097 .proc_handler = proc_dointvec
1100 .procname = "tcp_stdurg",
1101 .data = &init_net.ipv4.sysctl_tcp_stdurg,
1102 .maxlen = sizeof(int),
1104 .proc_handler = proc_dointvec
1107 .procname = "tcp_rfc1337",
1108 .data = &init_net.ipv4.sysctl_tcp_rfc1337,
1109 .maxlen = sizeof(int),
1111 .proc_handler = proc_dointvec
1114 .procname = "tcp_abort_on_overflow",
1115 .data = &init_net.ipv4.sysctl_tcp_abort_on_overflow,
1116 .maxlen = sizeof(int),
1118 .proc_handler = proc_dointvec
1121 .procname = "tcp_fack",
1122 .data = &init_net.ipv4.sysctl_tcp_fack,
1123 .maxlen = sizeof(int),
1125 .proc_handler = proc_dointvec
1128 .procname = "tcp_max_reordering",
1129 .data = &init_net.ipv4.sysctl_tcp_max_reordering,
1130 .maxlen = sizeof(int),
1132 .proc_handler = proc_dointvec
1135 .procname = "tcp_dsack",
1136 .data = &init_net.ipv4.sysctl_tcp_dsack,
1137 .maxlen = sizeof(int),
1139 .proc_handler = proc_dointvec
1142 .procname = "tcp_app_win",
1143 .data = &init_net.ipv4.sysctl_tcp_app_win,
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);