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 tcp_min_snd_mss_min = TCP_MIN_SND_MSS;
39 static int tcp_min_snd_mss_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 };
46 static int one_day_secs = 24 * 3600;
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 if (range[1] < range[0])
88 set_local_port_range(net, range);
95 static void inet_get_ping_group_range_table(struct ctl_table *table, kgid_t *low, kgid_t *high)
97 kgid_t *data = table->data;
99 container_of(table->data, struct net, ipv4.ping_group_range.range);
102 seq = read_seqbegin(&net->ipv4.ping_group_range.lock);
106 } while (read_seqretry(&net->ipv4.ping_group_range.lock, seq));
109 /* Update system visible IP port range */
110 static void set_ping_group_range(struct ctl_table *table, kgid_t low, kgid_t high)
112 kgid_t *data = table->data;
114 container_of(table->data, struct net, ipv4.ping_group_range.range);
115 write_seqlock(&net->ipv4.ping_group_range.lock);
118 write_sequnlock(&net->ipv4.ping_group_range.lock);
121 /* Validate changes from /proc interface. */
122 static int ipv4_ping_group_range(struct ctl_table *table, int write,
124 size_t *lenp, loff_t *ppos)
126 struct user_namespace *user_ns = current_user_ns();
130 struct ctl_table tmp = {
132 .maxlen = sizeof(urange),
134 .extra1 = &ip_ping_group_range_min,
135 .extra2 = &ip_ping_group_range_max,
138 inet_get_ping_group_range_table(table, &low, &high);
139 urange[0] = from_kgid_munged(user_ns, low);
140 urange[1] = from_kgid_munged(user_ns, high);
141 ret = proc_dointvec_minmax(&tmp, write, buffer, lenp, ppos);
143 if (write && ret == 0) {
144 low = make_kgid(user_ns, urange[0]);
145 high = make_kgid(user_ns, urange[1]);
146 if (!gid_valid(low) || !gid_valid(high))
148 if (urange[1] < urange[0] || gid_lt(high, low)) {
149 low = make_kgid(&init_user_ns, 1);
150 high = make_kgid(&init_user_ns, 0);
152 set_ping_group_range(table, low, high);
158 static int proc_tcp_congestion_control(struct ctl_table *ctl, int write,
159 void __user *buffer, size_t *lenp, loff_t *ppos)
161 char val[TCP_CA_NAME_MAX];
162 struct ctl_table tbl = {
164 .maxlen = TCP_CA_NAME_MAX,
168 tcp_get_default_congestion_control(val);
170 ret = proc_dostring(&tbl, write, buffer, lenp, ppos);
171 if (write && ret == 0)
172 ret = tcp_set_default_congestion_control(val);
176 static int proc_tcp_available_congestion_control(struct ctl_table *ctl,
178 void __user *buffer, size_t *lenp,
181 struct ctl_table tbl = { .maxlen = TCP_CA_BUF_MAX, };
184 tbl.data = kmalloc(tbl.maxlen, GFP_USER);
187 tcp_get_available_congestion_control(tbl.data, TCP_CA_BUF_MAX);
188 ret = proc_dostring(&tbl, write, buffer, lenp, ppos);
193 static int proc_allowed_congestion_control(struct ctl_table *ctl,
195 void __user *buffer, size_t *lenp,
198 struct ctl_table tbl = { .maxlen = TCP_CA_BUF_MAX };
201 tbl.data = kmalloc(tbl.maxlen, GFP_USER);
205 tcp_get_allowed_congestion_control(tbl.data, tbl.maxlen);
206 ret = proc_dostring(&tbl, write, buffer, lenp, ppos);
207 if (write && ret == 0)
208 ret = tcp_set_allowed_congestion_control(tbl.data);
213 static int proc_tcp_fastopen_key(struct ctl_table *ctl, int write,
214 void __user *buffer, size_t *lenp,
217 struct ctl_table tbl = { .maxlen = (TCP_FASTOPEN_KEY_LENGTH * 2 + 10) };
218 struct tcp_fastopen_context *ctxt;
219 u32 user_key[4]; /* 16 bytes, matching TCP_FASTOPEN_KEY_LENGTH */
223 tbl.data = kmalloc(tbl.maxlen, GFP_KERNEL);
228 ctxt = rcu_dereference(tcp_fastopen_ctx);
230 memcpy(key, ctxt->key, TCP_FASTOPEN_KEY_LENGTH);
232 memset(key, 0, sizeof(key));
235 for (i = 0; i < ARRAY_SIZE(key); i++)
236 user_key[i] = le32_to_cpu(key[i]);
238 snprintf(tbl.data, tbl.maxlen, "%08x-%08x-%08x-%08x",
239 user_key[0], user_key[1], user_key[2], user_key[3]);
240 ret = proc_dostring(&tbl, write, buffer, lenp, ppos);
242 if (write && ret == 0) {
243 if (sscanf(tbl.data, "%x-%x-%x-%x", user_key, user_key + 1,
244 user_key + 2, user_key + 3) != 4) {
248 /* Generate a dummy secret but don't publish it. This
249 * is needed so we don't regenerate a new key on the
250 * first invocation of tcp_fastopen_cookie_gen
252 tcp_fastopen_init_key_once(false);
254 for (i = 0; i < ARRAY_SIZE(user_key); i++)
255 key[i] = cpu_to_le32(user_key[i]);
257 tcp_fastopen_reset_cipher(key, TCP_FASTOPEN_KEY_LENGTH);
261 pr_debug("proc FO key set 0x%x-%x-%x-%x <- 0x%s: %u\n",
262 user_key[0], user_key[1], user_key[2], user_key[3],
263 (char *)tbl.data, ret);
268 static struct ctl_table ipv4_table[] = {
270 .procname = "tcp_timestamps",
271 .data = &sysctl_tcp_timestamps,
272 .maxlen = sizeof(int),
274 .proc_handler = proc_dointvec
277 .procname = "tcp_window_scaling",
278 .data = &sysctl_tcp_window_scaling,
279 .maxlen = sizeof(int),
281 .proc_handler = proc_dointvec
284 .procname = "tcp_sack",
285 .data = &sysctl_tcp_sack,
286 .maxlen = sizeof(int),
288 .proc_handler = proc_dointvec
291 .procname = "tcp_retrans_collapse",
292 .data = &sysctl_tcp_retrans_collapse,
293 .maxlen = sizeof(int),
295 .proc_handler = proc_dointvec
298 .procname = "tcp_max_orphans",
299 .data = &sysctl_tcp_max_orphans,
300 .maxlen = sizeof(int),
302 .proc_handler = proc_dointvec
305 .procname = "tcp_max_tw_buckets",
306 .data = &tcp_death_row.sysctl_max_tw_buckets,
307 .maxlen = sizeof(int),
309 .proc_handler = proc_dointvec
312 .procname = "tcp_fastopen",
313 .data = &sysctl_tcp_fastopen,
314 .maxlen = sizeof(int),
316 .proc_handler = proc_dointvec,
319 .procname = "tcp_fastopen_key",
321 .maxlen = ((TCP_FASTOPEN_KEY_LENGTH * 2) + 10),
322 .proc_handler = proc_tcp_fastopen_key,
325 .procname = "tcp_tw_recycle",
326 .data = &tcp_death_row.sysctl_tw_recycle,
327 .maxlen = sizeof(int),
329 .proc_handler = proc_dointvec
332 .procname = "tcp_abort_on_overflow",
333 .data = &sysctl_tcp_abort_on_overflow,
334 .maxlen = sizeof(int),
336 .proc_handler = proc_dointvec
339 .procname = "tcp_stdurg",
340 .data = &sysctl_tcp_stdurg,
341 .maxlen = sizeof(int),
343 .proc_handler = proc_dointvec
346 .procname = "tcp_rfc1337",
347 .data = &sysctl_tcp_rfc1337,
348 .maxlen = sizeof(int),
350 .proc_handler = proc_dointvec
353 .procname = "tcp_max_syn_backlog",
354 .data = &sysctl_max_syn_backlog,
355 .maxlen = sizeof(int),
357 .proc_handler = proc_dointvec
360 .procname = "inet_peer_threshold",
361 .data = &inet_peer_threshold,
362 .maxlen = sizeof(int),
364 .proc_handler = proc_dointvec
367 .procname = "inet_peer_minttl",
368 .data = &inet_peer_minttl,
369 .maxlen = sizeof(int),
371 .proc_handler = proc_dointvec_jiffies,
374 .procname = "inet_peer_maxttl",
375 .data = &inet_peer_maxttl,
376 .maxlen = sizeof(int),
378 .proc_handler = proc_dointvec_jiffies,
381 .procname = "tcp_fack",
382 .data = &sysctl_tcp_fack,
383 .maxlen = sizeof(int),
385 .proc_handler = proc_dointvec
388 .procname = "tcp_recovery",
389 .data = &sysctl_tcp_recovery,
390 .maxlen = sizeof(int),
392 .proc_handler = proc_dointvec,
395 .procname = "tcp_max_reordering",
396 .data = &sysctl_tcp_max_reordering,
397 .maxlen = sizeof(int),
399 .proc_handler = proc_dointvec
402 .procname = "tcp_dsack",
403 .data = &sysctl_tcp_dsack,
404 .maxlen = sizeof(int),
406 .proc_handler = proc_dointvec
409 .procname = "tcp_mem",
410 .maxlen = sizeof(sysctl_tcp_mem),
411 .data = &sysctl_tcp_mem,
413 .proc_handler = proc_doulongvec_minmax,
416 .procname = "tcp_wmem",
417 .data = &sysctl_tcp_wmem,
418 .maxlen = sizeof(sysctl_tcp_wmem),
420 .proc_handler = proc_dointvec_minmax,
424 .procname = "tcp_rmem",
425 .data = &sysctl_tcp_rmem,
426 .maxlen = sizeof(sysctl_tcp_rmem),
428 .proc_handler = proc_dointvec_minmax,
432 .procname = "tcp_app_win",
433 .data = &sysctl_tcp_app_win,
434 .maxlen = sizeof(int),
436 .proc_handler = proc_dointvec
439 .procname = "tcp_adv_win_scale",
440 .data = &sysctl_tcp_adv_win_scale,
441 .maxlen = sizeof(int),
443 .proc_handler = proc_dointvec_minmax,
444 .extra1 = &tcp_adv_win_scale_min,
445 .extra2 = &tcp_adv_win_scale_max,
448 .procname = "tcp_tw_reuse",
449 .data = &sysctl_tcp_tw_reuse,
450 .maxlen = sizeof(int),
452 .proc_handler = proc_dointvec
455 .procname = "tcp_frto",
456 .data = &sysctl_tcp_frto,
457 .maxlen = sizeof(int),
459 .proc_handler = proc_dointvec
462 .procname = "tcp_min_rtt_wlen",
463 .data = &sysctl_tcp_min_rtt_wlen,
464 .maxlen = sizeof(int),
466 .proc_handler = proc_dointvec_minmax,
468 .extra2 = &one_day_secs
471 .procname = "tcp_low_latency",
472 .data = &sysctl_tcp_low_latency,
473 .maxlen = sizeof(int),
475 .proc_handler = proc_dointvec
478 .procname = "tcp_no_metrics_save",
479 .data = &sysctl_tcp_nometrics_save,
480 .maxlen = sizeof(int),
482 .proc_handler = proc_dointvec,
485 .procname = "tcp_moderate_rcvbuf",
486 .data = &sysctl_tcp_moderate_rcvbuf,
487 .maxlen = sizeof(int),
489 .proc_handler = proc_dointvec,
492 .procname = "tcp_tso_win_divisor",
493 .data = &sysctl_tcp_tso_win_divisor,
494 .maxlen = sizeof(int),
496 .proc_handler = proc_dointvec,
499 .procname = "tcp_congestion_control",
501 .maxlen = TCP_CA_NAME_MAX,
502 .proc_handler = proc_tcp_congestion_control,
505 .procname = "tcp_workaround_signed_windows",
506 .data = &sysctl_tcp_workaround_signed_windows,
507 .maxlen = sizeof(int),
509 .proc_handler = proc_dointvec
512 .procname = "tcp_limit_output_bytes",
513 .data = &sysctl_tcp_limit_output_bytes,
514 .maxlen = sizeof(int),
516 .proc_handler = proc_dointvec
519 .procname = "tcp_challenge_ack_limit",
520 .data = &sysctl_tcp_challenge_ack_limit,
521 .maxlen = sizeof(int),
523 .proc_handler = proc_dointvec
526 .procname = "tcp_slow_start_after_idle",
527 .data = &sysctl_tcp_slow_start_after_idle,
528 .maxlen = sizeof(int),
530 .proc_handler = proc_dointvec
532 #ifdef CONFIG_NETLABEL
534 .procname = "cipso_cache_enable",
535 .data = &cipso_v4_cache_enabled,
536 .maxlen = sizeof(int),
538 .proc_handler = proc_dointvec,
541 .procname = "cipso_cache_bucket_size",
542 .data = &cipso_v4_cache_bucketsize,
543 .maxlen = sizeof(int),
545 .proc_handler = proc_dointvec,
548 .procname = "cipso_rbm_optfmt",
549 .data = &cipso_v4_rbm_optfmt,
550 .maxlen = sizeof(int),
552 .proc_handler = proc_dointvec,
555 .procname = "cipso_rbm_strictvalid",
556 .data = &cipso_v4_rbm_strictvalid,
557 .maxlen = sizeof(int),
559 .proc_handler = proc_dointvec,
561 #endif /* CONFIG_NETLABEL */
563 .procname = "tcp_available_congestion_control",
564 .maxlen = TCP_CA_BUF_MAX,
566 .proc_handler = proc_tcp_available_congestion_control,
569 .procname = "tcp_allowed_congestion_control",
570 .maxlen = TCP_CA_BUF_MAX,
572 .proc_handler = proc_allowed_congestion_control,
575 .procname = "tcp_thin_linear_timeouts",
576 .data = &sysctl_tcp_thin_linear_timeouts,
577 .maxlen = sizeof(int),
579 .proc_handler = proc_dointvec
582 .procname = "tcp_thin_dupack",
583 .data = &sysctl_tcp_thin_dupack,
584 .maxlen = sizeof(int),
586 .proc_handler = proc_dointvec
589 .procname = "tcp_early_retrans",
590 .data = &sysctl_tcp_early_retrans,
591 .maxlen = sizeof(int),
593 .proc_handler = proc_dointvec_minmax,
598 .procname = "tcp_min_tso_segs",
599 .data = &sysctl_tcp_min_tso_segs,
600 .maxlen = sizeof(int),
602 .proc_handler = proc_dointvec_minmax,
604 .extra2 = &gso_max_segs,
607 .procname = "tcp_pacing_ss_ratio",
608 .data = &sysctl_tcp_pacing_ss_ratio,
609 .maxlen = sizeof(int),
611 .proc_handler = proc_dointvec_minmax,
616 .procname = "tcp_pacing_ca_ratio",
617 .data = &sysctl_tcp_pacing_ca_ratio,
618 .maxlen = sizeof(int),
620 .proc_handler = proc_dointvec_minmax,
625 .procname = "tcp_autocorking",
626 .data = &sysctl_tcp_autocorking,
627 .maxlen = sizeof(int),
629 .proc_handler = proc_dointvec_minmax,
634 .procname = "tcp_invalid_ratelimit",
635 .data = &sysctl_tcp_invalid_ratelimit,
636 .maxlen = sizeof(int),
638 .proc_handler = proc_dointvec_ms_jiffies,
641 .procname = "icmp_msgs_per_sec",
642 .data = &sysctl_icmp_msgs_per_sec,
643 .maxlen = sizeof(int),
645 .proc_handler = proc_dointvec_minmax,
649 .procname = "icmp_msgs_burst",
650 .data = &sysctl_icmp_msgs_burst,
651 .maxlen = sizeof(int),
653 .proc_handler = proc_dointvec_minmax,
657 .procname = "udp_mem",
658 .data = &sysctl_udp_mem,
659 .maxlen = sizeof(sysctl_udp_mem),
661 .proc_handler = proc_doulongvec_minmax,
664 .procname = "udp_rmem_min",
665 .data = &sysctl_udp_rmem_min,
666 .maxlen = sizeof(sysctl_udp_rmem_min),
668 .proc_handler = proc_dointvec_minmax,
672 .procname = "udp_wmem_min",
673 .data = &sysctl_udp_wmem_min,
674 .maxlen = sizeof(sysctl_udp_wmem_min),
676 .proc_handler = proc_dointvec_minmax,
682 static struct ctl_table ipv4_net_table[] = {
684 .procname = "icmp_echo_ignore_all",
685 .data = &init_net.ipv4.sysctl_icmp_echo_ignore_all,
686 .maxlen = sizeof(int),
688 .proc_handler = proc_dointvec
691 .procname = "icmp_echo_ignore_broadcasts",
692 .data = &init_net.ipv4.sysctl_icmp_echo_ignore_broadcasts,
693 .maxlen = sizeof(int),
695 .proc_handler = proc_dointvec
698 .procname = "icmp_ignore_bogus_error_responses",
699 .data = &init_net.ipv4.sysctl_icmp_ignore_bogus_error_responses,
700 .maxlen = sizeof(int),
702 .proc_handler = proc_dointvec
705 .procname = "icmp_errors_use_inbound_ifaddr",
706 .data = &init_net.ipv4.sysctl_icmp_errors_use_inbound_ifaddr,
707 .maxlen = sizeof(int),
709 .proc_handler = proc_dointvec
712 .procname = "icmp_ratelimit",
713 .data = &init_net.ipv4.sysctl_icmp_ratelimit,
714 .maxlen = sizeof(int),
716 .proc_handler = proc_dointvec_ms_jiffies,
719 .procname = "icmp_ratemask",
720 .data = &init_net.ipv4.sysctl_icmp_ratemask,
721 .maxlen = sizeof(int),
723 .proc_handler = proc_dointvec
726 .procname = "ping_group_range",
727 .data = &init_net.ipv4.ping_group_range.range,
728 .maxlen = sizeof(gid_t)*2,
730 .proc_handler = ipv4_ping_group_range,
733 .procname = "tcp_ecn",
734 .data = &init_net.ipv4.sysctl_tcp_ecn,
735 .maxlen = sizeof(int),
737 .proc_handler = proc_dointvec
740 .procname = "tcp_ecn_fallback",
741 .data = &init_net.ipv4.sysctl_tcp_ecn_fallback,
742 .maxlen = sizeof(int),
744 .proc_handler = proc_dointvec
747 .procname = "ip_dynaddr",
748 .data = &init_net.ipv4.sysctl_ip_dynaddr,
749 .maxlen = sizeof(int),
751 .proc_handler = proc_dointvec
754 .procname = "ip_early_demux",
755 .data = &init_net.ipv4.sysctl_ip_early_demux,
756 .maxlen = sizeof(int),
758 .proc_handler = proc_dointvec
761 .procname = "ip_default_ttl",
762 .data = &init_net.ipv4.sysctl_ip_default_ttl,
763 .maxlen = sizeof(int),
765 .proc_handler = proc_dointvec_minmax,
766 .extra1 = &ip_ttl_min,
767 .extra2 = &ip_ttl_max,
770 .procname = "ip_local_port_range",
771 .maxlen = sizeof(init_net.ipv4.ip_local_ports.range),
772 .data = &init_net.ipv4.ip_local_ports.range,
774 .proc_handler = ipv4_local_port_range,
777 .procname = "ip_local_reserved_ports",
778 .data = &init_net.ipv4.sysctl_local_reserved_ports,
781 .proc_handler = proc_do_large_bitmap,
784 .procname = "ip_no_pmtu_disc",
785 .data = &init_net.ipv4.sysctl_ip_no_pmtu_disc,
786 .maxlen = sizeof(int),
788 .proc_handler = proc_dointvec
791 .procname = "ip_forward_use_pmtu",
792 .data = &init_net.ipv4.sysctl_ip_fwd_use_pmtu,
793 .maxlen = sizeof(int),
795 .proc_handler = proc_dointvec,
798 .procname = "ip_nonlocal_bind",
799 .data = &init_net.ipv4.sysctl_ip_nonlocal_bind,
800 .maxlen = sizeof(int),
802 .proc_handler = proc_dointvec
805 .procname = "fwmark_reflect",
806 .data = &init_net.ipv4.sysctl_fwmark_reflect,
807 .maxlen = sizeof(int),
809 .proc_handler = proc_dointvec,
812 .procname = "tcp_fwmark_accept",
813 .data = &init_net.ipv4.sysctl_tcp_fwmark_accept,
814 .maxlen = sizeof(int),
816 .proc_handler = proc_dointvec,
818 #ifdef CONFIG_NET_L3_MASTER_DEV
820 .procname = "tcp_l3mdev_accept",
821 .data = &init_net.ipv4.sysctl_tcp_l3mdev_accept,
822 .maxlen = sizeof(int),
824 .proc_handler = proc_dointvec_minmax,
830 .procname = "tcp_mtu_probing",
831 .data = &init_net.ipv4.sysctl_tcp_mtu_probing,
832 .maxlen = sizeof(int),
834 .proc_handler = proc_dointvec,
837 .procname = "tcp_base_mss",
838 .data = &init_net.ipv4.sysctl_tcp_base_mss,
839 .maxlen = sizeof(int),
841 .proc_handler = proc_dointvec,
844 .procname = "tcp_min_snd_mss",
845 .data = &init_net.ipv4.sysctl_tcp_min_snd_mss,
846 .maxlen = sizeof(int),
848 .proc_handler = proc_dointvec_minmax,
849 .extra1 = &tcp_min_snd_mss_min,
850 .extra2 = &tcp_min_snd_mss_max,
853 .procname = "tcp_probe_threshold",
854 .data = &init_net.ipv4.sysctl_tcp_probe_threshold,
855 .maxlen = sizeof(int),
857 .proc_handler = proc_dointvec,
860 .procname = "tcp_probe_interval",
861 .data = &init_net.ipv4.sysctl_tcp_probe_interval,
862 .maxlen = sizeof(int),
864 .proc_handler = proc_dointvec,
867 .procname = "igmp_link_local_mcast_reports",
868 .data = &init_net.ipv4.sysctl_igmp_llm_reports,
869 .maxlen = sizeof(int),
871 .proc_handler = proc_dointvec
874 .procname = "igmp_max_memberships",
875 .data = &init_net.ipv4.sysctl_igmp_max_memberships,
876 .maxlen = sizeof(int),
878 .proc_handler = proc_dointvec
881 .procname = "igmp_max_msf",
882 .data = &init_net.ipv4.sysctl_igmp_max_msf,
883 .maxlen = sizeof(int),
885 .proc_handler = proc_dointvec
887 #ifdef CONFIG_IP_MULTICAST
889 .procname = "igmp_qrv",
890 .data = &init_net.ipv4.sysctl_igmp_qrv,
891 .maxlen = sizeof(int),
893 .proc_handler = proc_dointvec_minmax,
898 .procname = "tcp_keepalive_time",
899 .data = &init_net.ipv4.sysctl_tcp_keepalive_time,
900 .maxlen = sizeof(int),
902 .proc_handler = proc_dointvec_jiffies,
905 .procname = "tcp_keepalive_probes",
906 .data = &init_net.ipv4.sysctl_tcp_keepalive_probes,
907 .maxlen = sizeof(int),
909 .proc_handler = proc_dointvec
912 .procname = "tcp_keepalive_intvl",
913 .data = &init_net.ipv4.sysctl_tcp_keepalive_intvl,
914 .maxlen = sizeof(int),
916 .proc_handler = proc_dointvec_jiffies,
919 .procname = "tcp_syn_retries",
920 .data = &init_net.ipv4.sysctl_tcp_syn_retries,
921 .maxlen = sizeof(int),
923 .proc_handler = proc_dointvec_minmax,
924 .extra1 = &tcp_syn_retries_min,
925 .extra2 = &tcp_syn_retries_max
928 .procname = "tcp_synack_retries",
929 .data = &init_net.ipv4.sysctl_tcp_synack_retries,
930 .maxlen = sizeof(int),
932 .proc_handler = proc_dointvec
934 #ifdef CONFIG_SYN_COOKIES
936 .procname = "tcp_syncookies",
937 .data = &init_net.ipv4.sysctl_tcp_syncookies,
938 .maxlen = sizeof(int),
940 .proc_handler = proc_dointvec
944 .procname = "tcp_reordering",
945 .data = &init_net.ipv4.sysctl_tcp_reordering,
946 .maxlen = sizeof(int),
948 .proc_handler = proc_dointvec
951 .procname = "tcp_retries1",
952 .data = &init_net.ipv4.sysctl_tcp_retries1,
953 .maxlen = sizeof(int),
955 .proc_handler = proc_dointvec_minmax,
956 .extra2 = &tcp_retr1_max
959 .procname = "tcp_retries2",
960 .data = &init_net.ipv4.sysctl_tcp_retries2,
961 .maxlen = sizeof(int),
963 .proc_handler = proc_dointvec
966 .procname = "tcp_orphan_retries",
967 .data = &init_net.ipv4.sysctl_tcp_orphan_retries,
968 .maxlen = sizeof(int),
970 .proc_handler = proc_dointvec
973 .procname = "tcp_fin_timeout",
974 .data = &init_net.ipv4.sysctl_tcp_fin_timeout,
975 .maxlen = sizeof(int),
977 .proc_handler = proc_dointvec_jiffies,
980 .procname = "tcp_notsent_lowat",
981 .data = &init_net.ipv4.sysctl_tcp_notsent_lowat,
982 .maxlen = sizeof(unsigned int),
984 .proc_handler = proc_douintvec,
986 #ifdef CONFIG_IP_ROUTE_MULTIPATH
988 .procname = "fib_multipath_use_neigh",
989 .data = &init_net.ipv4.sysctl_fib_multipath_use_neigh,
990 .maxlen = sizeof(int),
992 .proc_handler = proc_dointvec_minmax,
1000 static __net_init int ipv4_sysctl_init_net(struct net *net)
1002 struct ctl_table *table;
1004 table = ipv4_net_table;
1005 if (!net_eq(net, &init_net)) {
1008 table = kmemdup(table, sizeof(ipv4_net_table), GFP_KERNEL);
1012 /* Update the variables to point into the current struct net */
1013 for (i = 0; i < ARRAY_SIZE(ipv4_net_table) - 1; i++)
1014 table[i].data += (void *)net - (void *)&init_net;
1017 net->ipv4.ipv4_hdr = register_net_sysctl(net, "net/ipv4", table);
1018 if (!net->ipv4.ipv4_hdr)
1021 net->ipv4.sysctl_local_reserved_ports = kzalloc(65536 / 8, GFP_KERNEL);
1022 if (!net->ipv4.sysctl_local_reserved_ports)
1028 unregister_net_sysctl_table(net->ipv4.ipv4_hdr);
1030 if (!net_eq(net, &init_net))
1036 static __net_exit void ipv4_sysctl_exit_net(struct net *net)
1038 struct ctl_table *table;
1040 kfree(net->ipv4.sysctl_local_reserved_ports);
1041 table = net->ipv4.ipv4_hdr->ctl_table_arg;
1042 unregister_net_sysctl_table(net->ipv4.ipv4_hdr);
1046 static __net_initdata struct pernet_operations ipv4_sysctl_ops = {
1047 .init = ipv4_sysctl_init_net,
1048 .exit = ipv4_sysctl_exit_net,
1051 static __init int sysctl_ipv4_init(void)
1053 struct ctl_table_header *hdr;
1055 hdr = register_net_sysctl(&init_net, "net/ipv4", ipv4_table);
1059 if (register_pernet_subsys(&ipv4_sysctl_ops)) {
1060 unregister_net_sysctl_table(hdr);
1067 __initcall(sysctl_ipv4_init);