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>
31 static int thousand = 1000;
32 static int gso_max_segs = GSO_MAX_SEGS;
33 static int tcp_retr1_max = 255;
34 static int ip_local_port_range_min[] = { 1, 1 };
35 static int ip_local_port_range_max[] = { 65535, 65535 };
36 static int tcp_adv_win_scale_min = -31;
37 static int tcp_adv_win_scale_max = 31;
38 static int ip_privileged_port_min;
39 static int ip_privileged_port_max = 65535;
40 static int ip_ttl_min = 1;
41 static int ip_ttl_max = 255;
42 static int tcp_syn_retries_min = 1;
43 static int tcp_syn_retries_max = MAX_TCP_SYNCNT;
44 static int ip_ping_group_range_min[] = { 0, 0 };
45 static int ip_ping_group_range_max[] = { GID_T_MAX, GID_T_MAX };
47 /* Update system visible IP port range */
48 static void set_local_port_range(struct net *net, int range[2])
50 bool same_parity = !((range[0] ^ range[1]) & 1);
52 write_seqlock_bh(&net->ipv4.ip_local_ports.lock);
53 if (same_parity && !net->ipv4.ip_local_ports.warned) {
54 net->ipv4.ip_local_ports.warned = true;
55 pr_err_ratelimited("ip_local_port_range: prefer different parity for start/end values.\n");
57 net->ipv4.ip_local_ports.range[0] = range[0];
58 net->ipv4.ip_local_ports.range[1] = range[1];
59 write_sequnlock_bh(&net->ipv4.ip_local_ports.lock);
62 /* Validate changes from /proc interface. */
63 static int ipv4_local_port_range(struct ctl_table *table, int write,
65 size_t *lenp, loff_t *ppos)
68 container_of(table->data, struct net, ipv4.ip_local_ports.range);
71 struct ctl_table tmp = {
73 .maxlen = sizeof(range),
75 .extra1 = &ip_local_port_range_min,
76 .extra2 = &ip_local_port_range_max,
79 inet_get_local_port_range(net, &range[0], &range[1]);
81 ret = proc_dointvec_minmax(&tmp, write, buffer, lenp, ppos);
83 if (write && ret == 0) {
84 /* Ensure that the upper limit is not smaller than the lower,
85 * and that the lower does not encroach upon the privileged
88 if ((range[1] < range[0]) ||
89 (range[0] < net->ipv4.sysctl_ip_prot_sock))
92 set_local_port_range(net, range);
98 /* Validate changes from /proc interface. */
99 static int ipv4_privileged_ports(struct ctl_table *table, int write,
100 void __user *buffer, size_t *lenp, loff_t *ppos)
102 struct net *net = container_of(table->data, struct net,
103 ipv4.sysctl_ip_prot_sock);
107 struct ctl_table tmp = {
109 .maxlen = sizeof(pports),
111 .extra1 = &ip_privileged_port_min,
112 .extra2 = &ip_privileged_port_max,
115 pports = net->ipv4.sysctl_ip_prot_sock;
117 ret = proc_dointvec_minmax(&tmp, write, buffer, lenp, ppos);
119 if (write && ret == 0) {
120 inet_get_local_port_range(net, &range[0], &range[1]);
121 /* Ensure that the local port range doesn't overlap with the
122 * privileged port range.
124 if (range[0] < pports)
127 net->ipv4.sysctl_ip_prot_sock = pports;
133 static void inet_get_ping_group_range_table(struct ctl_table *table, kgid_t *low, kgid_t *high)
135 kgid_t *data = table->data;
137 container_of(table->data, struct net, ipv4.ping_group_range.range);
140 seq = read_seqbegin(&net->ipv4.ping_group_range.lock);
144 } while (read_seqretry(&net->ipv4.ping_group_range.lock, seq));
147 /* Update system visible IP port range */
148 static void set_ping_group_range(struct ctl_table *table, kgid_t low, kgid_t high)
150 kgid_t *data = table->data;
152 container_of(table->data, struct net, ipv4.ping_group_range.range);
153 write_seqlock(&net->ipv4.ping_group_range.lock);
156 write_sequnlock(&net->ipv4.ping_group_range.lock);
159 /* Validate changes from /proc interface. */
160 static int ipv4_ping_group_range(struct ctl_table *table, int write,
162 size_t *lenp, loff_t *ppos)
164 struct user_namespace *user_ns = current_user_ns();
168 struct ctl_table tmp = {
170 .maxlen = sizeof(urange),
172 .extra1 = &ip_ping_group_range_min,
173 .extra2 = &ip_ping_group_range_max,
176 inet_get_ping_group_range_table(table, &low, &high);
177 urange[0] = from_kgid_munged(user_ns, low);
178 urange[1] = from_kgid_munged(user_ns, high);
179 ret = proc_dointvec_minmax(&tmp, write, buffer, lenp, ppos);
181 if (write && ret == 0) {
182 low = make_kgid(user_ns, urange[0]);
183 high = make_kgid(user_ns, urange[1]);
184 if (!gid_valid(low) || !gid_valid(high) ||
185 (urange[1] < urange[0]) || gid_lt(high, low)) {
186 low = make_kgid(&init_user_ns, 1);
187 high = make_kgid(&init_user_ns, 0);
189 set_ping_group_range(table, low, high);
195 static int proc_tcp_congestion_control(struct ctl_table *ctl, int write,
196 void __user *buffer, size_t *lenp, loff_t *ppos)
198 char val[TCP_CA_NAME_MAX];
199 struct ctl_table tbl = {
201 .maxlen = TCP_CA_NAME_MAX,
205 tcp_get_default_congestion_control(val);
207 ret = proc_dostring(&tbl, write, buffer, lenp, ppos);
208 if (write && ret == 0)
209 ret = tcp_set_default_congestion_control(val);
213 static int proc_tcp_available_congestion_control(struct ctl_table *ctl,
215 void __user *buffer, size_t *lenp,
218 struct ctl_table tbl = { .maxlen = TCP_CA_BUF_MAX, };
221 tbl.data = kmalloc(tbl.maxlen, GFP_USER);
224 tcp_get_available_congestion_control(tbl.data, TCP_CA_BUF_MAX);
225 ret = proc_dostring(&tbl, write, buffer, lenp, ppos);
230 static int proc_allowed_congestion_control(struct ctl_table *ctl,
232 void __user *buffer, size_t *lenp,
235 struct ctl_table tbl = { .maxlen = TCP_CA_BUF_MAX };
238 tbl.data = kmalloc(tbl.maxlen, GFP_USER);
242 tcp_get_allowed_congestion_control(tbl.data, tbl.maxlen);
243 ret = proc_dostring(&tbl, write, buffer, lenp, ppos);
244 if (write && ret == 0)
245 ret = tcp_set_allowed_congestion_control(tbl.data);
250 static int proc_tcp_fastopen_key(struct ctl_table *ctl, int write,
251 void __user *buffer, size_t *lenp,
254 struct ctl_table tbl = { .maxlen = (TCP_FASTOPEN_KEY_LENGTH * 2 + 10) };
255 struct tcp_fastopen_context *ctxt;
257 u32 user_key[4]; /* 16 bytes, matching TCP_FASTOPEN_KEY_LENGTH */
259 tbl.data = kmalloc(tbl.maxlen, GFP_KERNEL);
264 ctxt = rcu_dereference(tcp_fastopen_ctx);
266 memcpy(user_key, ctxt->key, TCP_FASTOPEN_KEY_LENGTH);
268 memset(user_key, 0, sizeof(user_key));
271 snprintf(tbl.data, tbl.maxlen, "%08x-%08x-%08x-%08x",
272 user_key[0], user_key[1], user_key[2], user_key[3]);
273 ret = proc_dostring(&tbl, write, buffer, lenp, ppos);
275 if (write && ret == 0) {
276 if (sscanf(tbl.data, "%x-%x-%x-%x", user_key, user_key + 1,
277 user_key + 2, user_key + 3) != 4) {
281 /* Generate a dummy secret but don't publish it. This
282 * is needed so we don't regenerate a new key on the
283 * first invocation of tcp_fastopen_cookie_gen
285 tcp_fastopen_init_key_once(false);
286 tcp_fastopen_reset_cipher(user_key, TCP_FASTOPEN_KEY_LENGTH);
290 pr_debug("proc FO key set 0x%x-%x-%x-%x <- 0x%s: %u\n",
291 user_key[0], user_key[1], user_key[2], user_key[3],
292 (char *)tbl.data, ret);
297 static struct ctl_table ipv4_table[] = {
299 .procname = "tcp_timestamps",
300 .data = &sysctl_tcp_timestamps,
301 .maxlen = sizeof(int),
303 .proc_handler = proc_dointvec
306 .procname = "tcp_window_scaling",
307 .data = &sysctl_tcp_window_scaling,
308 .maxlen = sizeof(int),
310 .proc_handler = proc_dointvec
313 .procname = "tcp_sack",
314 .data = &sysctl_tcp_sack,
315 .maxlen = sizeof(int),
317 .proc_handler = proc_dointvec
320 .procname = "tcp_retrans_collapse",
321 .data = &sysctl_tcp_retrans_collapse,
322 .maxlen = sizeof(int),
324 .proc_handler = proc_dointvec
327 .procname = "tcp_max_orphans",
328 .data = &sysctl_tcp_max_orphans,
329 .maxlen = sizeof(int),
331 .proc_handler = proc_dointvec
334 .procname = "tcp_fastopen",
335 .data = &sysctl_tcp_fastopen,
336 .maxlen = sizeof(int),
338 .proc_handler = proc_dointvec,
341 .procname = "tcp_fastopen_key",
343 .maxlen = ((TCP_FASTOPEN_KEY_LENGTH * 2) + 10),
344 .proc_handler = proc_tcp_fastopen_key,
347 .procname = "tcp_abort_on_overflow",
348 .data = &sysctl_tcp_abort_on_overflow,
349 .maxlen = sizeof(int),
351 .proc_handler = proc_dointvec
354 .procname = "tcp_stdurg",
355 .data = &sysctl_tcp_stdurg,
356 .maxlen = sizeof(int),
358 .proc_handler = proc_dointvec
361 .procname = "tcp_rfc1337",
362 .data = &sysctl_tcp_rfc1337,
363 .maxlen = sizeof(int),
365 .proc_handler = proc_dointvec
368 .procname = "inet_peer_threshold",
369 .data = &inet_peer_threshold,
370 .maxlen = sizeof(int),
372 .proc_handler = proc_dointvec
375 .procname = "inet_peer_minttl",
376 .data = &inet_peer_minttl,
377 .maxlen = sizeof(int),
379 .proc_handler = proc_dointvec_jiffies,
382 .procname = "inet_peer_maxttl",
383 .data = &inet_peer_maxttl,
384 .maxlen = sizeof(int),
386 .proc_handler = proc_dointvec_jiffies,
389 .procname = "tcp_fack",
390 .data = &sysctl_tcp_fack,
391 .maxlen = sizeof(int),
393 .proc_handler = proc_dointvec
396 .procname = "tcp_recovery",
397 .data = &sysctl_tcp_recovery,
398 .maxlen = sizeof(int),
400 .proc_handler = proc_dointvec,
403 .procname = "tcp_max_reordering",
404 .data = &sysctl_tcp_max_reordering,
405 .maxlen = sizeof(int),
407 .proc_handler = proc_dointvec
410 .procname = "tcp_dsack",
411 .data = &sysctl_tcp_dsack,
412 .maxlen = sizeof(int),
414 .proc_handler = proc_dointvec
417 .procname = "tcp_mem",
418 .maxlen = sizeof(sysctl_tcp_mem),
419 .data = &sysctl_tcp_mem,
421 .proc_handler = proc_doulongvec_minmax,
424 .procname = "tcp_wmem",
425 .data = &sysctl_tcp_wmem,
426 .maxlen = sizeof(sysctl_tcp_wmem),
428 .proc_handler = proc_dointvec_minmax,
432 .procname = "tcp_rmem",
433 .data = &sysctl_tcp_rmem,
434 .maxlen = sizeof(sysctl_tcp_rmem),
436 .proc_handler = proc_dointvec_minmax,
440 .procname = "tcp_app_win",
441 .data = &sysctl_tcp_app_win,
442 .maxlen = sizeof(int),
444 .proc_handler = proc_dointvec
447 .procname = "tcp_adv_win_scale",
448 .data = &sysctl_tcp_adv_win_scale,
449 .maxlen = sizeof(int),
451 .proc_handler = proc_dointvec_minmax,
452 .extra1 = &tcp_adv_win_scale_min,
453 .extra2 = &tcp_adv_win_scale_max,
456 .procname = "tcp_frto",
457 .data = &sysctl_tcp_frto,
458 .maxlen = sizeof(int),
460 .proc_handler = proc_dointvec
463 .procname = "tcp_min_rtt_wlen",
464 .data = &sysctl_tcp_min_rtt_wlen,
465 .maxlen = sizeof(int),
467 .proc_handler = proc_dointvec
470 .procname = "tcp_low_latency",
471 .data = &sysctl_tcp_low_latency,
472 .maxlen = sizeof(int),
474 .proc_handler = proc_dointvec
477 .procname = "tcp_no_metrics_save",
478 .data = &sysctl_tcp_nometrics_save,
479 .maxlen = sizeof(int),
481 .proc_handler = proc_dointvec,
484 .procname = "tcp_moderate_rcvbuf",
485 .data = &sysctl_tcp_moderate_rcvbuf,
486 .maxlen = sizeof(int),
488 .proc_handler = proc_dointvec,
491 .procname = "tcp_tso_win_divisor",
492 .data = &sysctl_tcp_tso_win_divisor,
493 .maxlen = sizeof(int),
495 .proc_handler = proc_dointvec,
498 .procname = "tcp_congestion_control",
500 .maxlen = TCP_CA_NAME_MAX,
501 .proc_handler = proc_tcp_congestion_control,
504 .procname = "tcp_workaround_signed_windows",
505 .data = &sysctl_tcp_workaround_signed_windows,
506 .maxlen = sizeof(int),
508 .proc_handler = proc_dointvec
511 .procname = "tcp_limit_output_bytes",
512 .data = &sysctl_tcp_limit_output_bytes,
513 .maxlen = sizeof(int),
515 .proc_handler = proc_dointvec
518 .procname = "tcp_challenge_ack_limit",
519 .data = &sysctl_tcp_challenge_ack_limit,
520 .maxlen = sizeof(int),
522 .proc_handler = proc_dointvec
525 .procname = "tcp_slow_start_after_idle",
526 .data = &sysctl_tcp_slow_start_after_idle,
527 .maxlen = sizeof(int),
529 .proc_handler = proc_dointvec
531 #ifdef CONFIG_NETLABEL
533 .procname = "cipso_cache_enable",
534 .data = &cipso_v4_cache_enabled,
535 .maxlen = sizeof(int),
537 .proc_handler = proc_dointvec,
540 .procname = "cipso_cache_bucket_size",
541 .data = &cipso_v4_cache_bucketsize,
542 .maxlen = sizeof(int),
544 .proc_handler = proc_dointvec,
547 .procname = "cipso_rbm_optfmt",
548 .data = &cipso_v4_rbm_optfmt,
549 .maxlen = sizeof(int),
551 .proc_handler = proc_dointvec,
554 .procname = "cipso_rbm_strictvalid",
555 .data = &cipso_v4_rbm_strictvalid,
556 .maxlen = sizeof(int),
558 .proc_handler = proc_dointvec,
560 #endif /* CONFIG_NETLABEL */
562 .procname = "tcp_available_congestion_control",
563 .maxlen = TCP_CA_BUF_MAX,
565 .proc_handler = proc_tcp_available_congestion_control,
568 .procname = "tcp_allowed_congestion_control",
569 .maxlen = TCP_CA_BUF_MAX,
571 .proc_handler = proc_allowed_congestion_control,
574 .procname = "tcp_thin_linear_timeouts",
575 .data = &sysctl_tcp_thin_linear_timeouts,
576 .maxlen = sizeof(int),
578 .proc_handler = proc_dointvec
581 .procname = "tcp_early_retrans",
582 .data = &sysctl_tcp_early_retrans,
583 .maxlen = sizeof(int),
585 .proc_handler = proc_dointvec_minmax,
590 .procname = "tcp_min_tso_segs",
591 .data = &sysctl_tcp_min_tso_segs,
592 .maxlen = sizeof(int),
594 .proc_handler = proc_dointvec_minmax,
596 .extra2 = &gso_max_segs,
599 .procname = "tcp_pacing_ss_ratio",
600 .data = &sysctl_tcp_pacing_ss_ratio,
601 .maxlen = sizeof(int),
603 .proc_handler = proc_dointvec_minmax,
608 .procname = "tcp_pacing_ca_ratio",
609 .data = &sysctl_tcp_pacing_ca_ratio,
610 .maxlen = sizeof(int),
612 .proc_handler = proc_dointvec_minmax,
617 .procname = "tcp_autocorking",
618 .data = &sysctl_tcp_autocorking,
619 .maxlen = sizeof(int),
621 .proc_handler = proc_dointvec_minmax,
626 .procname = "tcp_invalid_ratelimit",
627 .data = &sysctl_tcp_invalid_ratelimit,
628 .maxlen = sizeof(int),
630 .proc_handler = proc_dointvec_ms_jiffies,
633 .procname = "icmp_msgs_per_sec",
634 .data = &sysctl_icmp_msgs_per_sec,
635 .maxlen = sizeof(int),
637 .proc_handler = proc_dointvec_minmax,
641 .procname = "icmp_msgs_burst",
642 .data = &sysctl_icmp_msgs_burst,
643 .maxlen = sizeof(int),
645 .proc_handler = proc_dointvec_minmax,
649 .procname = "udp_mem",
650 .data = &sysctl_udp_mem,
651 .maxlen = sizeof(sysctl_udp_mem),
653 .proc_handler = proc_doulongvec_minmax,
656 .procname = "udp_rmem_min",
657 .data = &sysctl_udp_rmem_min,
658 .maxlen = sizeof(sysctl_udp_rmem_min),
660 .proc_handler = proc_dointvec_minmax,
664 .procname = "udp_wmem_min",
665 .data = &sysctl_udp_wmem_min,
666 .maxlen = sizeof(sysctl_udp_wmem_min),
668 .proc_handler = proc_dointvec_minmax,
674 static struct ctl_table ipv4_net_table[] = {
676 .procname = "icmp_echo_ignore_all",
677 .data = &init_net.ipv4.sysctl_icmp_echo_ignore_all,
678 .maxlen = sizeof(int),
680 .proc_handler = proc_dointvec
683 .procname = "icmp_echo_ignore_broadcasts",
684 .data = &init_net.ipv4.sysctl_icmp_echo_ignore_broadcasts,
685 .maxlen = sizeof(int),
687 .proc_handler = proc_dointvec
690 .procname = "icmp_ignore_bogus_error_responses",
691 .data = &init_net.ipv4.sysctl_icmp_ignore_bogus_error_responses,
692 .maxlen = sizeof(int),
694 .proc_handler = proc_dointvec
697 .procname = "icmp_errors_use_inbound_ifaddr",
698 .data = &init_net.ipv4.sysctl_icmp_errors_use_inbound_ifaddr,
699 .maxlen = sizeof(int),
701 .proc_handler = proc_dointvec
704 .procname = "icmp_ratelimit",
705 .data = &init_net.ipv4.sysctl_icmp_ratelimit,
706 .maxlen = sizeof(int),
708 .proc_handler = proc_dointvec_ms_jiffies,
711 .procname = "icmp_ratemask",
712 .data = &init_net.ipv4.sysctl_icmp_ratemask,
713 .maxlen = sizeof(int),
715 .proc_handler = proc_dointvec
718 .procname = "ping_group_range",
719 .data = &init_net.ipv4.ping_group_range.range,
720 .maxlen = sizeof(gid_t)*2,
722 .proc_handler = ipv4_ping_group_range,
725 .procname = "tcp_ecn",
726 .data = &init_net.ipv4.sysctl_tcp_ecn,
727 .maxlen = sizeof(int),
729 .proc_handler = proc_dointvec
732 .procname = "tcp_ecn_fallback",
733 .data = &init_net.ipv4.sysctl_tcp_ecn_fallback,
734 .maxlen = sizeof(int),
736 .proc_handler = proc_dointvec
739 .procname = "ip_dynaddr",
740 .data = &init_net.ipv4.sysctl_ip_dynaddr,
741 .maxlen = sizeof(int),
743 .proc_handler = proc_dointvec
746 .procname = "ip_early_demux",
747 .data = &init_net.ipv4.sysctl_ip_early_demux,
748 .maxlen = sizeof(int),
750 .proc_handler = proc_dointvec
753 .procname = "ip_default_ttl",
754 .data = &init_net.ipv4.sysctl_ip_default_ttl,
755 .maxlen = sizeof(int),
757 .proc_handler = proc_dointvec_minmax,
758 .extra1 = &ip_ttl_min,
759 .extra2 = &ip_ttl_max,
762 .procname = "ip_local_port_range",
763 .maxlen = sizeof(init_net.ipv4.ip_local_ports.range),
764 .data = &init_net.ipv4.ip_local_ports.range,
766 .proc_handler = ipv4_local_port_range,
769 .procname = "ip_local_reserved_ports",
770 .data = &init_net.ipv4.sysctl_local_reserved_ports,
773 .proc_handler = proc_do_large_bitmap,
776 .procname = "ip_no_pmtu_disc",
777 .data = &init_net.ipv4.sysctl_ip_no_pmtu_disc,
778 .maxlen = sizeof(int),
780 .proc_handler = proc_dointvec
783 .procname = "ip_forward_use_pmtu",
784 .data = &init_net.ipv4.sysctl_ip_fwd_use_pmtu,
785 .maxlen = sizeof(int),
787 .proc_handler = proc_dointvec,
790 .procname = "ip_nonlocal_bind",
791 .data = &init_net.ipv4.sysctl_ip_nonlocal_bind,
792 .maxlen = sizeof(int),
794 .proc_handler = proc_dointvec
797 .procname = "fwmark_reflect",
798 .data = &init_net.ipv4.sysctl_fwmark_reflect,
799 .maxlen = sizeof(int),
801 .proc_handler = proc_dointvec,
804 .procname = "tcp_fwmark_accept",
805 .data = &init_net.ipv4.sysctl_tcp_fwmark_accept,
806 .maxlen = sizeof(int),
808 .proc_handler = proc_dointvec,
810 #ifdef CONFIG_NET_L3_MASTER_DEV
812 .procname = "tcp_l3mdev_accept",
813 .data = &init_net.ipv4.sysctl_tcp_l3mdev_accept,
814 .maxlen = sizeof(int),
816 .proc_handler = proc_dointvec_minmax,
822 .procname = "tcp_mtu_probing",
823 .data = &init_net.ipv4.sysctl_tcp_mtu_probing,
824 .maxlen = sizeof(int),
826 .proc_handler = proc_dointvec,
829 .procname = "tcp_base_mss",
830 .data = &init_net.ipv4.sysctl_tcp_base_mss,
831 .maxlen = sizeof(int),
833 .proc_handler = proc_dointvec,
836 .procname = "tcp_probe_threshold",
837 .data = &init_net.ipv4.sysctl_tcp_probe_threshold,
838 .maxlen = sizeof(int),
840 .proc_handler = proc_dointvec,
843 .procname = "tcp_probe_interval",
844 .data = &init_net.ipv4.sysctl_tcp_probe_interval,
845 .maxlen = sizeof(int),
847 .proc_handler = proc_dointvec,
850 .procname = "igmp_link_local_mcast_reports",
851 .data = &init_net.ipv4.sysctl_igmp_llm_reports,
852 .maxlen = sizeof(int),
854 .proc_handler = proc_dointvec
857 .procname = "igmp_max_memberships",
858 .data = &init_net.ipv4.sysctl_igmp_max_memberships,
859 .maxlen = sizeof(int),
861 .proc_handler = proc_dointvec
864 .procname = "igmp_max_msf",
865 .data = &init_net.ipv4.sysctl_igmp_max_msf,
866 .maxlen = sizeof(int),
868 .proc_handler = proc_dointvec
870 #ifdef CONFIG_IP_MULTICAST
872 .procname = "igmp_qrv",
873 .data = &init_net.ipv4.sysctl_igmp_qrv,
874 .maxlen = sizeof(int),
876 .proc_handler = proc_dointvec_minmax,
881 .procname = "tcp_keepalive_time",
882 .data = &init_net.ipv4.sysctl_tcp_keepalive_time,
883 .maxlen = sizeof(int),
885 .proc_handler = proc_dointvec_jiffies,
888 .procname = "tcp_keepalive_probes",
889 .data = &init_net.ipv4.sysctl_tcp_keepalive_probes,
890 .maxlen = sizeof(int),
892 .proc_handler = proc_dointvec
895 .procname = "tcp_keepalive_intvl",
896 .data = &init_net.ipv4.sysctl_tcp_keepalive_intvl,
897 .maxlen = sizeof(int),
899 .proc_handler = proc_dointvec_jiffies,
902 .procname = "tcp_syn_retries",
903 .data = &init_net.ipv4.sysctl_tcp_syn_retries,
904 .maxlen = sizeof(int),
906 .proc_handler = proc_dointvec_minmax,
907 .extra1 = &tcp_syn_retries_min,
908 .extra2 = &tcp_syn_retries_max
911 .procname = "tcp_synack_retries",
912 .data = &init_net.ipv4.sysctl_tcp_synack_retries,
913 .maxlen = sizeof(int),
915 .proc_handler = proc_dointvec
917 #ifdef CONFIG_SYN_COOKIES
919 .procname = "tcp_syncookies",
920 .data = &init_net.ipv4.sysctl_tcp_syncookies,
921 .maxlen = sizeof(int),
923 .proc_handler = proc_dointvec
927 .procname = "tcp_reordering",
928 .data = &init_net.ipv4.sysctl_tcp_reordering,
929 .maxlen = sizeof(int),
931 .proc_handler = proc_dointvec
934 .procname = "tcp_retries1",
935 .data = &init_net.ipv4.sysctl_tcp_retries1,
936 .maxlen = sizeof(int),
938 .proc_handler = proc_dointvec_minmax,
939 .extra2 = &tcp_retr1_max
942 .procname = "tcp_retries2",
943 .data = &init_net.ipv4.sysctl_tcp_retries2,
944 .maxlen = sizeof(int),
946 .proc_handler = proc_dointvec
949 .procname = "tcp_orphan_retries",
950 .data = &init_net.ipv4.sysctl_tcp_orphan_retries,
951 .maxlen = sizeof(int),
953 .proc_handler = proc_dointvec
956 .procname = "tcp_fin_timeout",
957 .data = &init_net.ipv4.sysctl_tcp_fin_timeout,
958 .maxlen = sizeof(int),
960 .proc_handler = proc_dointvec_jiffies,
963 .procname = "tcp_notsent_lowat",
964 .data = &init_net.ipv4.sysctl_tcp_notsent_lowat,
965 .maxlen = sizeof(unsigned int),
967 .proc_handler = proc_douintvec,
970 .procname = "tcp_tw_reuse",
971 .data = &init_net.ipv4.sysctl_tcp_tw_reuse,
972 .maxlen = sizeof(int),
974 .proc_handler = proc_dointvec
977 .procname = "tcp_max_tw_buckets",
978 .data = &init_net.ipv4.tcp_death_row.sysctl_max_tw_buckets,
979 .maxlen = sizeof(int),
981 .proc_handler = proc_dointvec
984 .procname = "tcp_max_syn_backlog",
985 .data = &init_net.ipv4.sysctl_max_syn_backlog,
986 .maxlen = sizeof(int),
988 .proc_handler = proc_dointvec
990 #ifdef CONFIG_IP_ROUTE_MULTIPATH
992 .procname = "fib_multipath_use_neigh",
993 .data = &init_net.ipv4.sysctl_fib_multipath_use_neigh,
994 .maxlen = sizeof(int),
996 .proc_handler = proc_dointvec_minmax,
1001 .procname = "fib_multipath_hash_policy",
1002 .data = &init_net.ipv4.sysctl_fib_multipath_hash_policy,
1003 .maxlen = sizeof(int),
1005 .proc_handler = proc_dointvec_minmax,
1011 .procname = "ip_unprivileged_port_start",
1012 .maxlen = sizeof(int),
1013 .data = &init_net.ipv4.sysctl_ip_prot_sock,
1015 .proc_handler = ipv4_privileged_ports,
1017 #ifdef CONFIG_NET_L3_MASTER_DEV
1019 .procname = "udp_l3mdev_accept",
1020 .data = &init_net.ipv4.sysctl_udp_l3mdev_accept,
1021 .maxlen = sizeof(int),
1023 .proc_handler = proc_dointvec_minmax,
1031 static __net_init int ipv4_sysctl_init_net(struct net *net)
1033 struct ctl_table *table;
1035 table = ipv4_net_table;
1036 if (!net_eq(net, &init_net)) {
1039 table = kmemdup(table, sizeof(ipv4_net_table), GFP_KERNEL);
1043 /* Update the variables to point into the current struct net */
1044 for (i = 0; i < ARRAY_SIZE(ipv4_net_table) - 1; i++)
1045 table[i].data += (void *)net - (void *)&init_net;
1048 net->ipv4.ipv4_hdr = register_net_sysctl(net, "net/ipv4", table);
1049 if (!net->ipv4.ipv4_hdr)
1052 net->ipv4.sysctl_local_reserved_ports = kzalloc(65536 / 8, GFP_KERNEL);
1053 if (!net->ipv4.sysctl_local_reserved_ports)
1059 unregister_net_sysctl_table(net->ipv4.ipv4_hdr);
1061 if (!net_eq(net, &init_net))
1067 static __net_exit void ipv4_sysctl_exit_net(struct net *net)
1069 struct ctl_table *table;
1071 kfree(net->ipv4.sysctl_local_reserved_ports);
1072 table = net->ipv4.ipv4_hdr->ctl_table_arg;
1073 unregister_net_sysctl_table(net->ipv4.ipv4_hdr);
1077 static __net_initdata struct pernet_operations ipv4_sysctl_ops = {
1078 .init = ipv4_sysctl_init_net,
1079 .exit = ipv4_sysctl_exit_net,
1082 static __init int sysctl_ipv4_init(void)
1084 struct ctl_table_header *hdr;
1086 hdr = register_net_sysctl(&init_net, "net/ipv4", ipv4_table);
1090 if (register_pernet_subsys(&ipv4_sysctl_ops)) {
1091 unregister_net_sysctl_table(hdr);
1098 __initcall(sysctl_ipv4_init);