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_retrans_collapse",
391 .data = &sysctl_tcp_retrans_collapse,
392 .maxlen = sizeof(int),
394 .proc_handler = proc_dointvec
397 .procname = "tcp_max_orphans",
398 .data = &sysctl_tcp_max_orphans,
399 .maxlen = sizeof(int),
401 .proc_handler = proc_dointvec
404 .procname = "tcp_abort_on_overflow",
405 .data = &sysctl_tcp_abort_on_overflow,
406 .maxlen = sizeof(int),
408 .proc_handler = proc_dointvec
411 .procname = "tcp_stdurg",
412 .data = &sysctl_tcp_stdurg,
413 .maxlen = sizeof(int),
415 .proc_handler = proc_dointvec
418 .procname = "tcp_rfc1337",
419 .data = &sysctl_tcp_rfc1337,
420 .maxlen = sizeof(int),
422 .proc_handler = proc_dointvec
425 .procname = "inet_peer_threshold",
426 .data = &inet_peer_threshold,
427 .maxlen = sizeof(int),
429 .proc_handler = proc_dointvec
432 .procname = "inet_peer_minttl",
433 .data = &inet_peer_minttl,
434 .maxlen = sizeof(int),
436 .proc_handler = proc_dointvec_jiffies,
439 .procname = "inet_peer_maxttl",
440 .data = &inet_peer_maxttl,
441 .maxlen = sizeof(int),
443 .proc_handler = proc_dointvec_jiffies,
446 .procname = "tcp_fack",
447 .data = &sysctl_tcp_fack,
448 .maxlen = sizeof(int),
450 .proc_handler = proc_dointvec
453 .procname = "tcp_max_reordering",
454 .data = &sysctl_tcp_max_reordering,
455 .maxlen = sizeof(int),
457 .proc_handler = proc_dointvec
460 .procname = "tcp_dsack",
461 .data = &sysctl_tcp_dsack,
462 .maxlen = sizeof(int),
464 .proc_handler = proc_dointvec
467 .procname = "tcp_mem",
468 .maxlen = sizeof(sysctl_tcp_mem),
469 .data = &sysctl_tcp_mem,
471 .proc_handler = proc_doulongvec_minmax,
474 .procname = "tcp_wmem",
475 .data = &sysctl_tcp_wmem,
476 .maxlen = sizeof(sysctl_tcp_wmem),
478 .proc_handler = proc_dointvec_minmax,
482 .procname = "tcp_rmem",
483 .data = &sysctl_tcp_rmem,
484 .maxlen = sizeof(sysctl_tcp_rmem),
486 .proc_handler = proc_dointvec_minmax,
490 .procname = "tcp_app_win",
491 .data = &sysctl_tcp_app_win,
492 .maxlen = sizeof(int),
494 .proc_handler = proc_dointvec
497 .procname = "tcp_adv_win_scale",
498 .data = &sysctl_tcp_adv_win_scale,
499 .maxlen = sizeof(int),
501 .proc_handler = proc_dointvec_minmax,
502 .extra1 = &tcp_adv_win_scale_min,
503 .extra2 = &tcp_adv_win_scale_max,
506 .procname = "tcp_frto",
507 .data = &sysctl_tcp_frto,
508 .maxlen = sizeof(int),
510 .proc_handler = proc_dointvec
513 .procname = "tcp_min_rtt_wlen",
514 .data = &sysctl_tcp_min_rtt_wlen,
515 .maxlen = sizeof(int),
517 .proc_handler = proc_dointvec
520 .procname = "tcp_low_latency",
521 .data = &sysctl_tcp_low_latency,
522 .maxlen = sizeof(int),
524 .proc_handler = proc_dointvec
527 .procname = "tcp_no_metrics_save",
528 .data = &sysctl_tcp_nometrics_save,
529 .maxlen = sizeof(int),
531 .proc_handler = proc_dointvec,
534 .procname = "tcp_moderate_rcvbuf",
535 .data = &sysctl_tcp_moderate_rcvbuf,
536 .maxlen = sizeof(int),
538 .proc_handler = proc_dointvec,
541 .procname = "tcp_tso_win_divisor",
542 .data = &sysctl_tcp_tso_win_divisor,
543 .maxlen = sizeof(int),
545 .proc_handler = proc_dointvec,
548 .procname = "tcp_congestion_control",
550 .maxlen = TCP_CA_NAME_MAX,
551 .proc_handler = proc_tcp_congestion_control,
554 .procname = "tcp_workaround_signed_windows",
555 .data = &sysctl_tcp_workaround_signed_windows,
556 .maxlen = sizeof(int),
558 .proc_handler = proc_dointvec
561 .procname = "tcp_limit_output_bytes",
562 .data = &sysctl_tcp_limit_output_bytes,
563 .maxlen = sizeof(int),
565 .proc_handler = proc_dointvec
568 .procname = "tcp_challenge_ack_limit",
569 .data = &sysctl_tcp_challenge_ack_limit,
570 .maxlen = sizeof(int),
572 .proc_handler = proc_dointvec
575 .procname = "tcp_slow_start_after_idle",
576 .data = &sysctl_tcp_slow_start_after_idle,
577 .maxlen = sizeof(int),
579 .proc_handler = proc_dointvec
581 #ifdef CONFIG_NETLABEL
583 .procname = "cipso_cache_enable",
584 .data = &cipso_v4_cache_enabled,
585 .maxlen = sizeof(int),
587 .proc_handler = proc_dointvec,
590 .procname = "cipso_cache_bucket_size",
591 .data = &cipso_v4_cache_bucketsize,
592 .maxlen = sizeof(int),
594 .proc_handler = proc_dointvec,
597 .procname = "cipso_rbm_optfmt",
598 .data = &cipso_v4_rbm_optfmt,
599 .maxlen = sizeof(int),
601 .proc_handler = proc_dointvec,
604 .procname = "cipso_rbm_strictvalid",
605 .data = &cipso_v4_rbm_strictvalid,
606 .maxlen = sizeof(int),
608 .proc_handler = proc_dointvec,
610 #endif /* CONFIG_NETLABEL */
612 .procname = "tcp_available_congestion_control",
613 .maxlen = TCP_CA_BUF_MAX,
615 .proc_handler = proc_tcp_available_congestion_control,
618 .procname = "tcp_allowed_congestion_control",
619 .maxlen = TCP_CA_BUF_MAX,
621 .proc_handler = proc_allowed_congestion_control,
624 .procname = "tcp_thin_linear_timeouts",
625 .data = &sysctl_tcp_thin_linear_timeouts,
626 .maxlen = sizeof(int),
628 .proc_handler = proc_dointvec
631 .procname = "tcp_min_tso_segs",
632 .data = &sysctl_tcp_min_tso_segs,
633 .maxlen = sizeof(int),
635 .proc_handler = proc_dointvec_minmax,
637 .extra2 = &gso_max_segs,
640 .procname = "tcp_pacing_ss_ratio",
641 .data = &sysctl_tcp_pacing_ss_ratio,
642 .maxlen = sizeof(int),
644 .proc_handler = proc_dointvec_minmax,
649 .procname = "tcp_pacing_ca_ratio",
650 .data = &sysctl_tcp_pacing_ca_ratio,
651 .maxlen = sizeof(int),
653 .proc_handler = proc_dointvec_minmax,
658 .procname = "tcp_autocorking",
659 .data = &sysctl_tcp_autocorking,
660 .maxlen = sizeof(int),
662 .proc_handler = proc_dointvec_minmax,
667 .procname = "tcp_invalid_ratelimit",
668 .data = &sysctl_tcp_invalid_ratelimit,
669 .maxlen = sizeof(int),
671 .proc_handler = proc_dointvec_ms_jiffies,
674 .procname = "tcp_available_ulp",
675 .maxlen = TCP_ULP_BUF_MAX,
677 .proc_handler = proc_tcp_available_ulp,
680 .procname = "icmp_msgs_per_sec",
681 .data = &sysctl_icmp_msgs_per_sec,
682 .maxlen = sizeof(int),
684 .proc_handler = proc_dointvec_minmax,
688 .procname = "icmp_msgs_burst",
689 .data = &sysctl_icmp_msgs_burst,
690 .maxlen = sizeof(int),
692 .proc_handler = proc_dointvec_minmax,
696 .procname = "udp_mem",
697 .data = &sysctl_udp_mem,
698 .maxlen = sizeof(sysctl_udp_mem),
700 .proc_handler = proc_doulongvec_minmax,
703 .procname = "udp_rmem_min",
704 .data = &sysctl_udp_rmem_min,
705 .maxlen = sizeof(sysctl_udp_rmem_min),
707 .proc_handler = proc_dointvec_minmax,
711 .procname = "udp_wmem_min",
712 .data = &sysctl_udp_wmem_min,
713 .maxlen = sizeof(sysctl_udp_wmem_min),
715 .proc_handler = proc_dointvec_minmax,
721 static struct ctl_table ipv4_net_table[] = {
723 .procname = "icmp_echo_ignore_all",
724 .data = &init_net.ipv4.sysctl_icmp_echo_ignore_all,
725 .maxlen = sizeof(int),
727 .proc_handler = proc_dointvec
730 .procname = "icmp_echo_ignore_broadcasts",
731 .data = &init_net.ipv4.sysctl_icmp_echo_ignore_broadcasts,
732 .maxlen = sizeof(int),
734 .proc_handler = proc_dointvec
737 .procname = "icmp_ignore_bogus_error_responses",
738 .data = &init_net.ipv4.sysctl_icmp_ignore_bogus_error_responses,
739 .maxlen = sizeof(int),
741 .proc_handler = proc_dointvec
744 .procname = "icmp_errors_use_inbound_ifaddr",
745 .data = &init_net.ipv4.sysctl_icmp_errors_use_inbound_ifaddr,
746 .maxlen = sizeof(int),
748 .proc_handler = proc_dointvec
751 .procname = "icmp_ratelimit",
752 .data = &init_net.ipv4.sysctl_icmp_ratelimit,
753 .maxlen = sizeof(int),
755 .proc_handler = proc_dointvec_ms_jiffies,
758 .procname = "icmp_ratemask",
759 .data = &init_net.ipv4.sysctl_icmp_ratemask,
760 .maxlen = sizeof(int),
762 .proc_handler = proc_dointvec
765 .procname = "ping_group_range",
766 .data = &init_net.ipv4.ping_group_range.range,
767 .maxlen = sizeof(gid_t)*2,
769 .proc_handler = ipv4_ping_group_range,
772 .procname = "tcp_ecn",
773 .data = &init_net.ipv4.sysctl_tcp_ecn,
774 .maxlen = sizeof(int),
776 .proc_handler = proc_dointvec
779 .procname = "tcp_ecn_fallback",
780 .data = &init_net.ipv4.sysctl_tcp_ecn_fallback,
781 .maxlen = sizeof(int),
783 .proc_handler = proc_dointvec
786 .procname = "ip_dynaddr",
787 .data = &init_net.ipv4.sysctl_ip_dynaddr,
788 .maxlen = sizeof(int),
790 .proc_handler = proc_dointvec
793 .procname = "ip_early_demux",
794 .data = &init_net.ipv4.sysctl_ip_early_demux,
795 .maxlen = sizeof(int),
797 .proc_handler = proc_dointvec
800 .procname = "udp_early_demux",
801 .data = &init_net.ipv4.sysctl_udp_early_demux,
802 .maxlen = sizeof(int),
804 .proc_handler = proc_udp_early_demux
807 .procname = "tcp_early_demux",
808 .data = &init_net.ipv4.sysctl_tcp_early_demux,
809 .maxlen = sizeof(int),
811 .proc_handler = proc_tcp_early_demux
814 .procname = "ip_default_ttl",
815 .data = &init_net.ipv4.sysctl_ip_default_ttl,
816 .maxlen = sizeof(int),
818 .proc_handler = proc_dointvec_minmax,
819 .extra1 = &ip_ttl_min,
820 .extra2 = &ip_ttl_max,
823 .procname = "ip_local_port_range",
824 .maxlen = sizeof(init_net.ipv4.ip_local_ports.range),
825 .data = &init_net.ipv4.ip_local_ports.range,
827 .proc_handler = ipv4_local_port_range,
830 .procname = "ip_local_reserved_ports",
831 .data = &init_net.ipv4.sysctl_local_reserved_ports,
834 .proc_handler = proc_do_large_bitmap,
837 .procname = "ip_no_pmtu_disc",
838 .data = &init_net.ipv4.sysctl_ip_no_pmtu_disc,
839 .maxlen = sizeof(int),
841 .proc_handler = proc_dointvec
844 .procname = "ip_forward_use_pmtu",
845 .data = &init_net.ipv4.sysctl_ip_fwd_use_pmtu,
846 .maxlen = sizeof(int),
848 .proc_handler = proc_dointvec,
851 .procname = "ip_nonlocal_bind",
852 .data = &init_net.ipv4.sysctl_ip_nonlocal_bind,
853 .maxlen = sizeof(int),
855 .proc_handler = proc_dointvec
858 .procname = "fwmark_reflect",
859 .data = &init_net.ipv4.sysctl_fwmark_reflect,
860 .maxlen = sizeof(int),
862 .proc_handler = proc_dointvec,
865 .procname = "tcp_fwmark_accept",
866 .data = &init_net.ipv4.sysctl_tcp_fwmark_accept,
867 .maxlen = sizeof(int),
869 .proc_handler = proc_dointvec,
871 #ifdef CONFIG_NET_L3_MASTER_DEV
873 .procname = "tcp_l3mdev_accept",
874 .data = &init_net.ipv4.sysctl_tcp_l3mdev_accept,
875 .maxlen = sizeof(int),
877 .proc_handler = proc_dointvec_minmax,
883 .procname = "tcp_mtu_probing",
884 .data = &init_net.ipv4.sysctl_tcp_mtu_probing,
885 .maxlen = sizeof(int),
887 .proc_handler = proc_dointvec,
890 .procname = "tcp_base_mss",
891 .data = &init_net.ipv4.sysctl_tcp_base_mss,
892 .maxlen = sizeof(int),
894 .proc_handler = proc_dointvec,
897 .procname = "tcp_probe_threshold",
898 .data = &init_net.ipv4.sysctl_tcp_probe_threshold,
899 .maxlen = sizeof(int),
901 .proc_handler = proc_dointvec,
904 .procname = "tcp_probe_interval",
905 .data = &init_net.ipv4.sysctl_tcp_probe_interval,
906 .maxlen = sizeof(int),
908 .proc_handler = proc_dointvec,
911 .procname = "igmp_link_local_mcast_reports",
912 .data = &init_net.ipv4.sysctl_igmp_llm_reports,
913 .maxlen = sizeof(int),
915 .proc_handler = proc_dointvec
918 .procname = "igmp_max_memberships",
919 .data = &init_net.ipv4.sysctl_igmp_max_memberships,
920 .maxlen = sizeof(int),
922 .proc_handler = proc_dointvec
925 .procname = "igmp_max_msf",
926 .data = &init_net.ipv4.sysctl_igmp_max_msf,
927 .maxlen = sizeof(int),
929 .proc_handler = proc_dointvec
931 #ifdef CONFIG_IP_MULTICAST
933 .procname = "igmp_qrv",
934 .data = &init_net.ipv4.sysctl_igmp_qrv,
935 .maxlen = sizeof(int),
937 .proc_handler = proc_dointvec_minmax,
942 .procname = "tcp_keepalive_time",
943 .data = &init_net.ipv4.sysctl_tcp_keepalive_time,
944 .maxlen = sizeof(int),
946 .proc_handler = proc_dointvec_jiffies,
949 .procname = "tcp_keepalive_probes",
950 .data = &init_net.ipv4.sysctl_tcp_keepalive_probes,
951 .maxlen = sizeof(int),
953 .proc_handler = proc_dointvec
956 .procname = "tcp_keepalive_intvl",
957 .data = &init_net.ipv4.sysctl_tcp_keepalive_intvl,
958 .maxlen = sizeof(int),
960 .proc_handler = proc_dointvec_jiffies,
963 .procname = "tcp_syn_retries",
964 .data = &init_net.ipv4.sysctl_tcp_syn_retries,
965 .maxlen = sizeof(int),
967 .proc_handler = proc_dointvec_minmax,
968 .extra1 = &tcp_syn_retries_min,
969 .extra2 = &tcp_syn_retries_max
972 .procname = "tcp_synack_retries",
973 .data = &init_net.ipv4.sysctl_tcp_synack_retries,
974 .maxlen = sizeof(int),
976 .proc_handler = proc_dointvec
978 #ifdef CONFIG_SYN_COOKIES
980 .procname = "tcp_syncookies",
981 .data = &init_net.ipv4.sysctl_tcp_syncookies,
982 .maxlen = sizeof(int),
984 .proc_handler = proc_dointvec
988 .procname = "tcp_reordering",
989 .data = &init_net.ipv4.sysctl_tcp_reordering,
990 .maxlen = sizeof(int),
992 .proc_handler = proc_dointvec
995 .procname = "tcp_retries1",
996 .data = &init_net.ipv4.sysctl_tcp_retries1,
997 .maxlen = sizeof(int),
999 .proc_handler = proc_dointvec_minmax,
1000 .extra2 = &tcp_retr1_max
1003 .procname = "tcp_retries2",
1004 .data = &init_net.ipv4.sysctl_tcp_retries2,
1005 .maxlen = sizeof(int),
1007 .proc_handler = proc_dointvec
1010 .procname = "tcp_orphan_retries",
1011 .data = &init_net.ipv4.sysctl_tcp_orphan_retries,
1012 .maxlen = sizeof(int),
1014 .proc_handler = proc_dointvec
1017 .procname = "tcp_fin_timeout",
1018 .data = &init_net.ipv4.sysctl_tcp_fin_timeout,
1019 .maxlen = sizeof(int),
1021 .proc_handler = proc_dointvec_jiffies,
1024 .procname = "tcp_notsent_lowat",
1025 .data = &init_net.ipv4.sysctl_tcp_notsent_lowat,
1026 .maxlen = sizeof(unsigned int),
1028 .proc_handler = proc_douintvec,
1031 .procname = "tcp_tw_reuse",
1032 .data = &init_net.ipv4.sysctl_tcp_tw_reuse,
1033 .maxlen = sizeof(int),
1035 .proc_handler = proc_dointvec
1038 .procname = "tcp_max_tw_buckets",
1039 .data = &init_net.ipv4.tcp_death_row.sysctl_max_tw_buckets,
1040 .maxlen = sizeof(int),
1042 .proc_handler = proc_dointvec
1045 .procname = "tcp_max_syn_backlog",
1046 .data = &init_net.ipv4.sysctl_max_syn_backlog,
1047 .maxlen = sizeof(int),
1049 .proc_handler = proc_dointvec
1052 .procname = "tcp_fastopen",
1053 .data = &init_net.ipv4.sysctl_tcp_fastopen,
1054 .maxlen = sizeof(int),
1056 .proc_handler = proc_dointvec,
1059 .procname = "tcp_fastopen_key",
1061 .data = &init_net.ipv4.sysctl_tcp_fastopen,
1062 .maxlen = ((TCP_FASTOPEN_KEY_LENGTH * 2) + 10),
1063 .proc_handler = proc_tcp_fastopen_key,
1066 .procname = "tcp_fastopen_blackhole_timeout_sec",
1067 .data = &init_net.ipv4.sysctl_tcp_fastopen_blackhole_timeout,
1068 .maxlen = sizeof(int),
1070 .proc_handler = proc_tfo_blackhole_detect_timeout,
1073 #ifdef CONFIG_IP_ROUTE_MULTIPATH
1075 .procname = "fib_multipath_use_neigh",
1076 .data = &init_net.ipv4.sysctl_fib_multipath_use_neigh,
1077 .maxlen = sizeof(int),
1079 .proc_handler = proc_dointvec_minmax,
1084 .procname = "fib_multipath_hash_policy",
1085 .data = &init_net.ipv4.sysctl_fib_multipath_hash_policy,
1086 .maxlen = sizeof(int),
1088 .proc_handler = proc_dointvec_minmax,
1094 .procname = "ip_unprivileged_port_start",
1095 .maxlen = sizeof(int),
1096 .data = &init_net.ipv4.sysctl_ip_prot_sock,
1098 .proc_handler = ipv4_privileged_ports,
1100 #ifdef CONFIG_NET_L3_MASTER_DEV
1102 .procname = "udp_l3mdev_accept",
1103 .data = &init_net.ipv4.sysctl_udp_l3mdev_accept,
1104 .maxlen = sizeof(int),
1106 .proc_handler = proc_dointvec_minmax,
1112 .procname = "tcp_sack",
1113 .data = &init_net.ipv4.sysctl_tcp_sack,
1114 .maxlen = sizeof(int),
1116 .proc_handler = proc_dointvec
1119 .procname = "tcp_window_scaling",
1120 .data = &init_net.ipv4.sysctl_tcp_window_scaling,
1121 .maxlen = sizeof(int),
1123 .proc_handler = proc_dointvec
1126 .procname = "tcp_timestamps",
1127 .data = &init_net.ipv4.sysctl_tcp_timestamps,
1128 .maxlen = sizeof(int),
1130 .proc_handler = proc_dointvec
1133 .procname = "tcp_early_retrans",
1134 .data = &init_net.ipv4.sysctl_tcp_early_retrans,
1135 .maxlen = sizeof(int),
1137 .proc_handler = proc_dointvec_minmax,
1142 .procname = "tcp_recovery",
1143 .data = &init_net.ipv4.sysctl_tcp_recovery,
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);