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 };
48 /* Update system visible IP port range */
49 static void set_local_port_range(struct net *net, int range[2])
51 bool same_parity = !((range[0] ^ range[1]) & 1);
53 write_seqlock_bh(&net->ipv4.ip_local_ports.lock);
54 if (same_parity && !net->ipv4.ip_local_ports.warned) {
55 net->ipv4.ip_local_ports.warned = true;
56 pr_err_ratelimited("ip_local_port_range: prefer different parity for start/end values.\n");
58 net->ipv4.ip_local_ports.range[0] = range[0];
59 net->ipv4.ip_local_ports.range[1] = range[1];
60 write_sequnlock_bh(&net->ipv4.ip_local_ports.lock);
63 /* Validate changes from /proc interface. */
64 static int ipv4_local_port_range(struct ctl_table *table, int write,
66 size_t *lenp, loff_t *ppos)
69 container_of(table->data, struct net, ipv4.ip_local_ports.range);
72 struct ctl_table tmp = {
74 .maxlen = sizeof(range),
76 .extra1 = &ip_local_port_range_min,
77 .extra2 = &ip_local_port_range_max,
80 inet_get_local_port_range(net, &range[0], &range[1]);
82 ret = proc_dointvec_minmax(&tmp, write, buffer, lenp, ppos);
84 if (write && ret == 0) {
85 /* Ensure that the upper limit is not smaller than the lower,
86 * and that the lower does not encroach upon the privileged
89 if ((range[1] < range[0]) ||
90 (range[0] < net->ipv4.sysctl_ip_prot_sock))
93 set_local_port_range(net, range);
99 /* Validate changes from /proc interface. */
100 static int ipv4_privileged_ports(struct ctl_table *table, int write,
101 void __user *buffer, size_t *lenp, loff_t *ppos)
103 struct net *net = container_of(table->data, struct net,
104 ipv4.sysctl_ip_prot_sock);
108 struct ctl_table tmp = {
110 .maxlen = sizeof(pports),
112 .extra1 = &ip_privileged_port_min,
113 .extra2 = &ip_privileged_port_max,
116 pports = net->ipv4.sysctl_ip_prot_sock;
118 ret = proc_dointvec_minmax(&tmp, write, buffer, lenp, ppos);
120 if (write && ret == 0) {
121 inet_get_local_port_range(net, &range[0], &range[1]);
122 /* Ensure that the local port range doesn't overlap with the
123 * privileged port range.
125 if (range[0] < pports)
128 net->ipv4.sysctl_ip_prot_sock = pports;
134 static void inet_get_ping_group_range_table(struct ctl_table *table, kgid_t *low, kgid_t *high)
136 kgid_t *data = table->data;
138 container_of(table->data, struct net, ipv4.ping_group_range.range);
141 seq = read_seqbegin(&net->ipv4.ping_group_range.lock);
145 } while (read_seqretry(&net->ipv4.ping_group_range.lock, seq));
148 /* Update system visible IP port range */
149 static void set_ping_group_range(struct ctl_table *table, kgid_t low, kgid_t high)
151 kgid_t *data = table->data;
153 container_of(table->data, struct net, ipv4.ping_group_range.range);
154 write_seqlock(&net->ipv4.ping_group_range.lock);
157 write_sequnlock(&net->ipv4.ping_group_range.lock);
160 /* Validate changes from /proc interface. */
161 static int ipv4_ping_group_range(struct ctl_table *table, int write,
163 size_t *lenp, loff_t *ppos)
165 struct user_namespace *user_ns = current_user_ns();
169 struct ctl_table tmp = {
171 .maxlen = sizeof(urange),
173 .extra1 = &ip_ping_group_range_min,
174 .extra2 = &ip_ping_group_range_max,
177 inet_get_ping_group_range_table(table, &low, &high);
178 urange[0] = from_kgid_munged(user_ns, low);
179 urange[1] = from_kgid_munged(user_ns, high);
180 ret = proc_dointvec_minmax(&tmp, write, buffer, lenp, ppos);
182 if (write && ret == 0) {
183 low = make_kgid(user_ns, urange[0]);
184 high = make_kgid(user_ns, urange[1]);
185 if (!gid_valid(low) || !gid_valid(high) ||
186 (urange[1] < urange[0]) || gid_lt(high, low)) {
187 low = make_kgid(&init_user_ns, 1);
188 high = make_kgid(&init_user_ns, 0);
190 set_ping_group_range(table, low, high);
196 static int proc_tcp_congestion_control(struct ctl_table *ctl, int write,
197 void __user *buffer, size_t *lenp, loff_t *ppos)
199 char val[TCP_CA_NAME_MAX];
200 struct ctl_table tbl = {
202 .maxlen = TCP_CA_NAME_MAX,
206 tcp_get_default_congestion_control(val);
208 ret = proc_dostring(&tbl, write, buffer, lenp, ppos);
209 if (write && ret == 0)
210 ret = tcp_set_default_congestion_control(val);
214 static int proc_tcp_available_congestion_control(struct ctl_table *ctl,
216 void __user *buffer, size_t *lenp,
219 struct ctl_table tbl = { .maxlen = TCP_CA_BUF_MAX, };
222 tbl.data = kmalloc(tbl.maxlen, GFP_USER);
225 tcp_get_available_congestion_control(tbl.data, TCP_CA_BUF_MAX);
226 ret = proc_dostring(&tbl, write, buffer, lenp, ppos);
231 static int proc_allowed_congestion_control(struct ctl_table *ctl,
233 void __user *buffer, size_t *lenp,
236 struct ctl_table tbl = { .maxlen = TCP_CA_BUF_MAX };
239 tbl.data = kmalloc(tbl.maxlen, GFP_USER);
243 tcp_get_allowed_congestion_control(tbl.data, tbl.maxlen);
244 ret = proc_dostring(&tbl, write, buffer, lenp, ppos);
245 if (write && ret == 0)
246 ret = tcp_set_allowed_congestion_control(tbl.data);
251 static int proc_tcp_fastopen_key(struct ctl_table *ctl, int write,
252 void __user *buffer, size_t *lenp,
255 struct ctl_table tbl = { .maxlen = (TCP_FASTOPEN_KEY_LENGTH * 2 + 10) };
256 struct tcp_fastopen_context *ctxt;
258 u32 user_key[4]; /* 16 bytes, matching TCP_FASTOPEN_KEY_LENGTH */
260 tbl.data = kmalloc(tbl.maxlen, GFP_KERNEL);
265 ctxt = rcu_dereference(tcp_fastopen_ctx);
267 memcpy(user_key, ctxt->key, TCP_FASTOPEN_KEY_LENGTH);
269 memset(user_key, 0, sizeof(user_key));
272 snprintf(tbl.data, tbl.maxlen, "%08x-%08x-%08x-%08x",
273 user_key[0], user_key[1], user_key[2], user_key[3]);
274 ret = proc_dostring(&tbl, write, buffer, lenp, ppos);
276 if (write && ret == 0) {
277 if (sscanf(tbl.data, "%x-%x-%x-%x", user_key, user_key + 1,
278 user_key + 2, user_key + 3) != 4) {
282 /* Generate a dummy secret but don't publish it. This
283 * is needed so we don't regenerate a new key on the
284 * first invocation of tcp_fastopen_cookie_gen
286 tcp_fastopen_init_key_once(false);
287 tcp_fastopen_reset_cipher(user_key, TCP_FASTOPEN_KEY_LENGTH);
291 pr_debug("proc FO key set 0x%x-%x-%x-%x <- 0x%s: %u\n",
292 user_key[0], user_key[1], user_key[2], user_key[3],
293 (char *)tbl.data, ret);
298 static void proc_configure_early_demux(int enabled, int protocol)
300 struct net_protocol *ipprot;
301 #if IS_ENABLED(CONFIG_IPV6)
302 struct inet6_protocol *ip6prot;
307 ipprot = rcu_dereference(inet_protos[protocol]);
309 ipprot->early_demux = enabled ? ipprot->early_demux_handler :
312 #if IS_ENABLED(CONFIG_IPV6)
313 ip6prot = rcu_dereference(inet6_protos[protocol]);
315 ip6prot->early_demux = enabled ? ip6prot->early_demux_handler :
321 static int proc_tcp_early_demux(struct ctl_table *table, int write,
322 void __user *buffer, size_t *lenp, loff_t *ppos)
326 ret = proc_dointvec(table, write, buffer, lenp, ppos);
329 int enabled = init_net.ipv4.sysctl_tcp_early_demux;
331 proc_configure_early_demux(enabled, IPPROTO_TCP);
337 static int proc_udp_early_demux(struct ctl_table *table, int write,
338 void __user *buffer, size_t *lenp, loff_t *ppos)
342 ret = proc_dointvec(table, write, buffer, lenp, ppos);
345 int enabled = init_net.ipv4.sysctl_udp_early_demux;
347 proc_configure_early_demux(enabled, IPPROTO_UDP);
353 static int proc_tfo_blackhole_detect_timeout(struct ctl_table *table,
356 size_t *lenp, loff_t *ppos)
360 ret = proc_dointvec_minmax(table, write, buffer, lenp, ppos);
361 if (write && ret == 0)
362 tcp_fastopen_active_timeout_reset();
366 static struct ctl_table ipv4_table[] = {
368 .procname = "tcp_timestamps",
369 .data = &sysctl_tcp_timestamps,
370 .maxlen = sizeof(int),
372 .proc_handler = proc_dointvec
375 .procname = "tcp_window_scaling",
376 .data = &sysctl_tcp_window_scaling,
377 .maxlen = sizeof(int),
379 .proc_handler = proc_dointvec
382 .procname = "tcp_retrans_collapse",
383 .data = &sysctl_tcp_retrans_collapse,
384 .maxlen = sizeof(int),
386 .proc_handler = proc_dointvec
389 .procname = "tcp_max_orphans",
390 .data = &sysctl_tcp_max_orphans,
391 .maxlen = sizeof(int),
393 .proc_handler = proc_dointvec
396 .procname = "tcp_fastopen",
397 .data = &sysctl_tcp_fastopen,
398 .maxlen = sizeof(int),
400 .proc_handler = proc_dointvec,
403 .procname = "tcp_fastopen_key",
405 .maxlen = ((TCP_FASTOPEN_KEY_LENGTH * 2) + 10),
406 .proc_handler = proc_tcp_fastopen_key,
409 .procname = "tcp_fastopen_blackhole_timeout_sec",
410 .data = &sysctl_tcp_fastopen_blackhole_timeout,
411 .maxlen = sizeof(int),
413 .proc_handler = proc_tfo_blackhole_detect_timeout,
417 .procname = "tcp_abort_on_overflow",
418 .data = &sysctl_tcp_abort_on_overflow,
419 .maxlen = sizeof(int),
421 .proc_handler = proc_dointvec
424 .procname = "tcp_stdurg",
425 .data = &sysctl_tcp_stdurg,
426 .maxlen = sizeof(int),
428 .proc_handler = proc_dointvec
431 .procname = "tcp_rfc1337",
432 .data = &sysctl_tcp_rfc1337,
433 .maxlen = sizeof(int),
435 .proc_handler = proc_dointvec
438 .procname = "inet_peer_threshold",
439 .data = &inet_peer_threshold,
440 .maxlen = sizeof(int),
442 .proc_handler = proc_dointvec
445 .procname = "inet_peer_minttl",
446 .data = &inet_peer_minttl,
447 .maxlen = sizeof(int),
449 .proc_handler = proc_dointvec_jiffies,
452 .procname = "inet_peer_maxttl",
453 .data = &inet_peer_maxttl,
454 .maxlen = sizeof(int),
456 .proc_handler = proc_dointvec_jiffies,
459 .procname = "tcp_fack",
460 .data = &sysctl_tcp_fack,
461 .maxlen = sizeof(int),
463 .proc_handler = proc_dointvec
466 .procname = "tcp_recovery",
467 .data = &sysctl_tcp_recovery,
468 .maxlen = sizeof(int),
470 .proc_handler = proc_dointvec,
473 .procname = "tcp_max_reordering",
474 .data = &sysctl_tcp_max_reordering,
475 .maxlen = sizeof(int),
477 .proc_handler = proc_dointvec
480 .procname = "tcp_dsack",
481 .data = &sysctl_tcp_dsack,
482 .maxlen = sizeof(int),
484 .proc_handler = proc_dointvec
487 .procname = "tcp_mem",
488 .maxlen = sizeof(sysctl_tcp_mem),
489 .data = &sysctl_tcp_mem,
491 .proc_handler = proc_doulongvec_minmax,
494 .procname = "tcp_wmem",
495 .data = &sysctl_tcp_wmem,
496 .maxlen = sizeof(sysctl_tcp_wmem),
498 .proc_handler = proc_dointvec_minmax,
502 .procname = "tcp_rmem",
503 .data = &sysctl_tcp_rmem,
504 .maxlen = sizeof(sysctl_tcp_rmem),
506 .proc_handler = proc_dointvec_minmax,
510 .procname = "tcp_app_win",
511 .data = &sysctl_tcp_app_win,
512 .maxlen = sizeof(int),
514 .proc_handler = proc_dointvec
517 .procname = "tcp_adv_win_scale",
518 .data = &sysctl_tcp_adv_win_scale,
519 .maxlen = sizeof(int),
521 .proc_handler = proc_dointvec_minmax,
522 .extra1 = &tcp_adv_win_scale_min,
523 .extra2 = &tcp_adv_win_scale_max,
526 .procname = "tcp_frto",
527 .data = &sysctl_tcp_frto,
528 .maxlen = sizeof(int),
530 .proc_handler = proc_dointvec
533 .procname = "tcp_min_rtt_wlen",
534 .data = &sysctl_tcp_min_rtt_wlen,
535 .maxlen = sizeof(int),
537 .proc_handler = proc_dointvec
540 .procname = "tcp_low_latency",
541 .data = &sysctl_tcp_low_latency,
542 .maxlen = sizeof(int),
544 .proc_handler = proc_dointvec
547 .procname = "tcp_no_metrics_save",
548 .data = &sysctl_tcp_nometrics_save,
549 .maxlen = sizeof(int),
551 .proc_handler = proc_dointvec,
554 .procname = "tcp_moderate_rcvbuf",
555 .data = &sysctl_tcp_moderate_rcvbuf,
556 .maxlen = sizeof(int),
558 .proc_handler = proc_dointvec,
561 .procname = "tcp_tso_win_divisor",
562 .data = &sysctl_tcp_tso_win_divisor,
563 .maxlen = sizeof(int),
565 .proc_handler = proc_dointvec,
568 .procname = "tcp_congestion_control",
570 .maxlen = TCP_CA_NAME_MAX,
571 .proc_handler = proc_tcp_congestion_control,
574 .procname = "tcp_workaround_signed_windows",
575 .data = &sysctl_tcp_workaround_signed_windows,
576 .maxlen = sizeof(int),
578 .proc_handler = proc_dointvec
581 .procname = "tcp_limit_output_bytes",
582 .data = &sysctl_tcp_limit_output_bytes,
583 .maxlen = sizeof(int),
585 .proc_handler = proc_dointvec
588 .procname = "tcp_challenge_ack_limit",
589 .data = &sysctl_tcp_challenge_ack_limit,
590 .maxlen = sizeof(int),
592 .proc_handler = proc_dointvec
595 .procname = "tcp_slow_start_after_idle",
596 .data = &sysctl_tcp_slow_start_after_idle,
597 .maxlen = sizeof(int),
599 .proc_handler = proc_dointvec
601 #ifdef CONFIG_NETLABEL
603 .procname = "cipso_cache_enable",
604 .data = &cipso_v4_cache_enabled,
605 .maxlen = sizeof(int),
607 .proc_handler = proc_dointvec,
610 .procname = "cipso_cache_bucket_size",
611 .data = &cipso_v4_cache_bucketsize,
612 .maxlen = sizeof(int),
614 .proc_handler = proc_dointvec,
617 .procname = "cipso_rbm_optfmt",
618 .data = &cipso_v4_rbm_optfmt,
619 .maxlen = sizeof(int),
621 .proc_handler = proc_dointvec,
624 .procname = "cipso_rbm_strictvalid",
625 .data = &cipso_v4_rbm_strictvalid,
626 .maxlen = sizeof(int),
628 .proc_handler = proc_dointvec,
630 #endif /* CONFIG_NETLABEL */
632 .procname = "tcp_available_congestion_control",
633 .maxlen = TCP_CA_BUF_MAX,
635 .proc_handler = proc_tcp_available_congestion_control,
638 .procname = "tcp_allowed_congestion_control",
639 .maxlen = TCP_CA_BUF_MAX,
641 .proc_handler = proc_allowed_congestion_control,
644 .procname = "tcp_thin_linear_timeouts",
645 .data = &sysctl_tcp_thin_linear_timeouts,
646 .maxlen = sizeof(int),
648 .proc_handler = proc_dointvec
651 .procname = "tcp_early_retrans",
652 .data = &sysctl_tcp_early_retrans,
653 .maxlen = sizeof(int),
655 .proc_handler = proc_dointvec_minmax,
660 .procname = "tcp_min_tso_segs",
661 .data = &sysctl_tcp_min_tso_segs,
662 .maxlen = sizeof(int),
664 .proc_handler = proc_dointvec_minmax,
666 .extra2 = &gso_max_segs,
669 .procname = "tcp_pacing_ss_ratio",
670 .data = &sysctl_tcp_pacing_ss_ratio,
671 .maxlen = sizeof(int),
673 .proc_handler = proc_dointvec_minmax,
678 .procname = "tcp_pacing_ca_ratio",
679 .data = &sysctl_tcp_pacing_ca_ratio,
680 .maxlen = sizeof(int),
682 .proc_handler = proc_dointvec_minmax,
687 .procname = "tcp_autocorking",
688 .data = &sysctl_tcp_autocorking,
689 .maxlen = sizeof(int),
691 .proc_handler = proc_dointvec_minmax,
696 .procname = "tcp_invalid_ratelimit",
697 .data = &sysctl_tcp_invalid_ratelimit,
698 .maxlen = sizeof(int),
700 .proc_handler = proc_dointvec_ms_jiffies,
703 .procname = "icmp_msgs_per_sec",
704 .data = &sysctl_icmp_msgs_per_sec,
705 .maxlen = sizeof(int),
707 .proc_handler = proc_dointvec_minmax,
711 .procname = "icmp_msgs_burst",
712 .data = &sysctl_icmp_msgs_burst,
713 .maxlen = sizeof(int),
715 .proc_handler = proc_dointvec_minmax,
719 .procname = "udp_mem",
720 .data = &sysctl_udp_mem,
721 .maxlen = sizeof(sysctl_udp_mem),
723 .proc_handler = proc_doulongvec_minmax,
726 .procname = "udp_rmem_min",
727 .data = &sysctl_udp_rmem_min,
728 .maxlen = sizeof(sysctl_udp_rmem_min),
730 .proc_handler = proc_dointvec_minmax,
734 .procname = "udp_wmem_min",
735 .data = &sysctl_udp_wmem_min,
736 .maxlen = sizeof(sysctl_udp_wmem_min),
738 .proc_handler = proc_dointvec_minmax,
744 static struct ctl_table ipv4_net_table[] = {
746 .procname = "icmp_echo_ignore_all",
747 .data = &init_net.ipv4.sysctl_icmp_echo_ignore_all,
748 .maxlen = sizeof(int),
750 .proc_handler = proc_dointvec
753 .procname = "icmp_echo_ignore_broadcasts",
754 .data = &init_net.ipv4.sysctl_icmp_echo_ignore_broadcasts,
755 .maxlen = sizeof(int),
757 .proc_handler = proc_dointvec
760 .procname = "icmp_ignore_bogus_error_responses",
761 .data = &init_net.ipv4.sysctl_icmp_ignore_bogus_error_responses,
762 .maxlen = sizeof(int),
764 .proc_handler = proc_dointvec
767 .procname = "icmp_errors_use_inbound_ifaddr",
768 .data = &init_net.ipv4.sysctl_icmp_errors_use_inbound_ifaddr,
769 .maxlen = sizeof(int),
771 .proc_handler = proc_dointvec
774 .procname = "icmp_ratelimit",
775 .data = &init_net.ipv4.sysctl_icmp_ratelimit,
776 .maxlen = sizeof(int),
778 .proc_handler = proc_dointvec_ms_jiffies,
781 .procname = "icmp_ratemask",
782 .data = &init_net.ipv4.sysctl_icmp_ratemask,
783 .maxlen = sizeof(int),
785 .proc_handler = proc_dointvec
788 .procname = "ping_group_range",
789 .data = &init_net.ipv4.ping_group_range.range,
790 .maxlen = sizeof(gid_t)*2,
792 .proc_handler = ipv4_ping_group_range,
795 .procname = "tcp_ecn",
796 .data = &init_net.ipv4.sysctl_tcp_ecn,
797 .maxlen = sizeof(int),
799 .proc_handler = proc_dointvec
802 .procname = "tcp_ecn_fallback",
803 .data = &init_net.ipv4.sysctl_tcp_ecn_fallback,
804 .maxlen = sizeof(int),
806 .proc_handler = proc_dointvec
809 .procname = "ip_dynaddr",
810 .data = &init_net.ipv4.sysctl_ip_dynaddr,
811 .maxlen = sizeof(int),
813 .proc_handler = proc_dointvec
816 .procname = "ip_early_demux",
817 .data = &init_net.ipv4.sysctl_ip_early_demux,
818 .maxlen = sizeof(int),
820 .proc_handler = proc_dointvec
823 .procname = "udp_early_demux",
824 .data = &init_net.ipv4.sysctl_udp_early_demux,
825 .maxlen = sizeof(int),
827 .proc_handler = proc_udp_early_demux
830 .procname = "tcp_early_demux",
831 .data = &init_net.ipv4.sysctl_tcp_early_demux,
832 .maxlen = sizeof(int),
834 .proc_handler = proc_tcp_early_demux
837 .procname = "ip_default_ttl",
838 .data = &init_net.ipv4.sysctl_ip_default_ttl,
839 .maxlen = sizeof(int),
841 .proc_handler = proc_dointvec_minmax,
842 .extra1 = &ip_ttl_min,
843 .extra2 = &ip_ttl_max,
846 .procname = "ip_local_port_range",
847 .maxlen = sizeof(init_net.ipv4.ip_local_ports.range),
848 .data = &init_net.ipv4.ip_local_ports.range,
850 .proc_handler = ipv4_local_port_range,
853 .procname = "ip_local_reserved_ports",
854 .data = &init_net.ipv4.sysctl_local_reserved_ports,
857 .proc_handler = proc_do_large_bitmap,
860 .procname = "ip_no_pmtu_disc",
861 .data = &init_net.ipv4.sysctl_ip_no_pmtu_disc,
862 .maxlen = sizeof(int),
864 .proc_handler = proc_dointvec
867 .procname = "ip_forward_use_pmtu",
868 .data = &init_net.ipv4.sysctl_ip_fwd_use_pmtu,
869 .maxlen = sizeof(int),
871 .proc_handler = proc_dointvec,
874 .procname = "ip_nonlocal_bind",
875 .data = &init_net.ipv4.sysctl_ip_nonlocal_bind,
876 .maxlen = sizeof(int),
878 .proc_handler = proc_dointvec
881 .procname = "fwmark_reflect",
882 .data = &init_net.ipv4.sysctl_fwmark_reflect,
883 .maxlen = sizeof(int),
885 .proc_handler = proc_dointvec,
888 .procname = "tcp_fwmark_accept",
889 .data = &init_net.ipv4.sysctl_tcp_fwmark_accept,
890 .maxlen = sizeof(int),
892 .proc_handler = proc_dointvec,
894 #ifdef CONFIG_NET_L3_MASTER_DEV
896 .procname = "tcp_l3mdev_accept",
897 .data = &init_net.ipv4.sysctl_tcp_l3mdev_accept,
898 .maxlen = sizeof(int),
900 .proc_handler = proc_dointvec_minmax,
906 .procname = "tcp_mtu_probing",
907 .data = &init_net.ipv4.sysctl_tcp_mtu_probing,
908 .maxlen = sizeof(int),
910 .proc_handler = proc_dointvec,
913 .procname = "tcp_base_mss",
914 .data = &init_net.ipv4.sysctl_tcp_base_mss,
915 .maxlen = sizeof(int),
917 .proc_handler = proc_dointvec,
920 .procname = "tcp_probe_threshold",
921 .data = &init_net.ipv4.sysctl_tcp_probe_threshold,
922 .maxlen = sizeof(int),
924 .proc_handler = proc_dointvec,
927 .procname = "tcp_probe_interval",
928 .data = &init_net.ipv4.sysctl_tcp_probe_interval,
929 .maxlen = sizeof(int),
931 .proc_handler = proc_dointvec,
934 .procname = "igmp_link_local_mcast_reports",
935 .data = &init_net.ipv4.sysctl_igmp_llm_reports,
936 .maxlen = sizeof(int),
938 .proc_handler = proc_dointvec
941 .procname = "igmp_max_memberships",
942 .data = &init_net.ipv4.sysctl_igmp_max_memberships,
943 .maxlen = sizeof(int),
945 .proc_handler = proc_dointvec
948 .procname = "igmp_max_msf",
949 .data = &init_net.ipv4.sysctl_igmp_max_msf,
950 .maxlen = sizeof(int),
952 .proc_handler = proc_dointvec
954 #ifdef CONFIG_IP_MULTICAST
956 .procname = "igmp_qrv",
957 .data = &init_net.ipv4.sysctl_igmp_qrv,
958 .maxlen = sizeof(int),
960 .proc_handler = proc_dointvec_minmax,
965 .procname = "tcp_keepalive_time",
966 .data = &init_net.ipv4.sysctl_tcp_keepalive_time,
967 .maxlen = sizeof(int),
969 .proc_handler = proc_dointvec_jiffies,
972 .procname = "tcp_keepalive_probes",
973 .data = &init_net.ipv4.sysctl_tcp_keepalive_probes,
974 .maxlen = sizeof(int),
976 .proc_handler = proc_dointvec
979 .procname = "tcp_keepalive_intvl",
980 .data = &init_net.ipv4.sysctl_tcp_keepalive_intvl,
981 .maxlen = sizeof(int),
983 .proc_handler = proc_dointvec_jiffies,
986 .procname = "tcp_syn_retries",
987 .data = &init_net.ipv4.sysctl_tcp_syn_retries,
988 .maxlen = sizeof(int),
990 .proc_handler = proc_dointvec_minmax,
991 .extra1 = &tcp_syn_retries_min,
992 .extra2 = &tcp_syn_retries_max
995 .procname = "tcp_synack_retries",
996 .data = &init_net.ipv4.sysctl_tcp_synack_retries,
997 .maxlen = sizeof(int),
999 .proc_handler = proc_dointvec
1001 #ifdef CONFIG_SYN_COOKIES
1003 .procname = "tcp_syncookies",
1004 .data = &init_net.ipv4.sysctl_tcp_syncookies,
1005 .maxlen = sizeof(int),
1007 .proc_handler = proc_dointvec
1011 .procname = "tcp_reordering",
1012 .data = &init_net.ipv4.sysctl_tcp_reordering,
1013 .maxlen = sizeof(int),
1015 .proc_handler = proc_dointvec
1018 .procname = "tcp_retries1",
1019 .data = &init_net.ipv4.sysctl_tcp_retries1,
1020 .maxlen = sizeof(int),
1022 .proc_handler = proc_dointvec_minmax,
1023 .extra2 = &tcp_retr1_max
1026 .procname = "tcp_retries2",
1027 .data = &init_net.ipv4.sysctl_tcp_retries2,
1028 .maxlen = sizeof(int),
1030 .proc_handler = proc_dointvec
1033 .procname = "tcp_orphan_retries",
1034 .data = &init_net.ipv4.sysctl_tcp_orphan_retries,
1035 .maxlen = sizeof(int),
1037 .proc_handler = proc_dointvec
1040 .procname = "tcp_fin_timeout",
1041 .data = &init_net.ipv4.sysctl_tcp_fin_timeout,
1042 .maxlen = sizeof(int),
1044 .proc_handler = proc_dointvec_jiffies,
1047 .procname = "tcp_notsent_lowat",
1048 .data = &init_net.ipv4.sysctl_tcp_notsent_lowat,
1049 .maxlen = sizeof(unsigned int),
1051 .proc_handler = proc_douintvec,
1054 .procname = "tcp_tw_reuse",
1055 .data = &init_net.ipv4.sysctl_tcp_tw_reuse,
1056 .maxlen = sizeof(int),
1058 .proc_handler = proc_dointvec
1061 .procname = "tcp_max_tw_buckets",
1062 .data = &init_net.ipv4.tcp_death_row.sysctl_max_tw_buckets,
1063 .maxlen = sizeof(int),
1065 .proc_handler = proc_dointvec
1068 .procname = "tcp_max_syn_backlog",
1069 .data = &init_net.ipv4.sysctl_max_syn_backlog,
1070 .maxlen = sizeof(int),
1072 .proc_handler = proc_dointvec
1074 #ifdef CONFIG_IP_ROUTE_MULTIPATH
1076 .procname = "fib_multipath_use_neigh",
1077 .data = &init_net.ipv4.sysctl_fib_multipath_use_neigh,
1078 .maxlen = sizeof(int),
1080 .proc_handler = proc_dointvec_minmax,
1085 .procname = "fib_multipath_hash_policy",
1086 .data = &init_net.ipv4.sysctl_fib_multipath_hash_policy,
1087 .maxlen = sizeof(int),
1089 .proc_handler = proc_dointvec_minmax,
1095 .procname = "ip_unprivileged_port_start",
1096 .maxlen = sizeof(int),
1097 .data = &init_net.ipv4.sysctl_ip_prot_sock,
1099 .proc_handler = ipv4_privileged_ports,
1101 #ifdef CONFIG_NET_L3_MASTER_DEV
1103 .procname = "udp_l3mdev_accept",
1104 .data = &init_net.ipv4.sysctl_udp_l3mdev_accept,
1105 .maxlen = sizeof(int),
1107 .proc_handler = proc_dointvec_minmax,
1113 .procname = "tcp_sack",
1114 .data = &init_net.ipv4.sysctl_tcp_sack,
1115 .maxlen = sizeof(int),
1117 .proc_handler = proc_dointvec
1122 static __net_init int ipv4_sysctl_init_net(struct net *net)
1124 struct ctl_table *table;
1126 table = ipv4_net_table;
1127 if (!net_eq(net, &init_net)) {
1130 table = kmemdup(table, sizeof(ipv4_net_table), GFP_KERNEL);
1134 /* Update the variables to point into the current struct net */
1135 for (i = 0; i < ARRAY_SIZE(ipv4_net_table) - 1; i++)
1136 table[i].data += (void *)net - (void *)&init_net;
1139 net->ipv4.ipv4_hdr = register_net_sysctl(net, "net/ipv4", table);
1140 if (!net->ipv4.ipv4_hdr)
1143 net->ipv4.sysctl_local_reserved_ports = kzalloc(65536 / 8, GFP_KERNEL);
1144 if (!net->ipv4.sysctl_local_reserved_ports)
1150 unregister_net_sysctl_table(net->ipv4.ipv4_hdr);
1152 if (!net_eq(net, &init_net))
1158 static __net_exit void ipv4_sysctl_exit_net(struct net *net)
1160 struct ctl_table *table;
1162 kfree(net->ipv4.sysctl_local_reserved_ports);
1163 table = net->ipv4.ipv4_hdr->ctl_table_arg;
1164 unregister_net_sysctl_table(net->ipv4.ipv4_hdr);
1168 static __net_initdata struct pernet_operations ipv4_sysctl_ops = {
1169 .init = ipv4_sysctl_init_net,
1170 .exit = ipv4_sysctl_exit_net,
1173 static __init int sysctl_ipv4_init(void)
1175 struct ctl_table_header *hdr;
1177 hdr = register_net_sysctl(&init_net, "net/ipv4", ipv4_table);
1181 if (register_pernet_subsys(&ipv4_sysctl_ops)) {
1182 unregister_net_sysctl_table(hdr);
1189 __initcall(sysctl_ipv4_init);