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/tcp_memcontrol.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 tcp_min_snd_mss_min = TCP_MIN_SND_MSS;
40 static int tcp_min_snd_mss_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 };
47 static int one_day_secs = 24 * 3600;
49 /* Update system visible IP port range */
50 static void set_local_port_range(struct net *net, int range[2])
52 bool same_parity = !((range[0] ^ range[1]) & 1);
54 write_seqlock_bh(&net->ipv4.ip_local_ports.lock);
55 if (same_parity && !net->ipv4.ip_local_ports.warned) {
56 net->ipv4.ip_local_ports.warned = true;
57 pr_err_ratelimited("ip_local_port_range: prefer different parity for start/end values.\n");
59 net->ipv4.ip_local_ports.range[0] = range[0];
60 net->ipv4.ip_local_ports.range[1] = range[1];
61 write_sequnlock_bh(&net->ipv4.ip_local_ports.lock);
64 /* Validate changes from /proc interface. */
65 static int ipv4_local_port_range(struct ctl_table *table, int write,
67 size_t *lenp, loff_t *ppos)
70 container_of(table->data, struct net, ipv4.ip_local_ports.range);
73 struct ctl_table tmp = {
75 .maxlen = sizeof(range),
77 .extra1 = &ip_local_port_range_min,
78 .extra2 = &ip_local_port_range_max,
81 inet_get_local_port_range(net, &range[0], &range[1]);
83 ret = proc_dointvec_minmax(&tmp, write, buffer, lenp, ppos);
85 if (write && ret == 0) {
86 if (range[1] < range[0])
89 set_local_port_range(net, range);
96 static void inet_get_ping_group_range_table(struct ctl_table *table, kgid_t *low, kgid_t *high)
98 kgid_t *data = table->data;
100 container_of(table->data, struct net, ipv4.ping_group_range.range);
103 seq = read_seqbegin(&net->ipv4.ping_group_range.lock);
107 } while (read_seqretry(&net->ipv4.ping_group_range.lock, seq));
110 /* Update system visible IP port range */
111 static void set_ping_group_range(struct ctl_table *table, kgid_t low, kgid_t high)
113 kgid_t *data = table->data;
115 container_of(table->data, struct net, ipv4.ping_group_range.range);
116 write_seqlock(&net->ipv4.ping_group_range.lock);
119 write_sequnlock(&net->ipv4.ping_group_range.lock);
122 /* Validate changes from /proc interface. */
123 static int ipv4_ping_group_range(struct ctl_table *table, int write,
125 size_t *lenp, loff_t *ppos)
127 struct user_namespace *user_ns = current_user_ns();
131 struct ctl_table tmp = {
133 .maxlen = sizeof(urange),
135 .extra1 = &ip_ping_group_range_min,
136 .extra2 = &ip_ping_group_range_max,
139 inet_get_ping_group_range_table(table, &low, &high);
140 urange[0] = from_kgid_munged(user_ns, low);
141 urange[1] = from_kgid_munged(user_ns, high);
142 ret = proc_dointvec_minmax(&tmp, write, buffer, lenp, ppos);
144 if (write && ret == 0) {
145 low = make_kgid(user_ns, urange[0]);
146 high = make_kgid(user_ns, urange[1]);
147 if (!gid_valid(low) || !gid_valid(high))
149 if (urange[1] < urange[0] || gid_lt(high, low)) {
150 low = make_kgid(&init_user_ns, 1);
151 high = make_kgid(&init_user_ns, 0);
153 set_ping_group_range(table, low, high);
159 static int proc_tcp_congestion_control(struct ctl_table *ctl, int write,
160 void __user *buffer, size_t *lenp, loff_t *ppos)
162 char val[TCP_CA_NAME_MAX];
163 struct ctl_table tbl = {
165 .maxlen = TCP_CA_NAME_MAX,
169 tcp_get_default_congestion_control(val);
171 ret = proc_dostring(&tbl, write, buffer, lenp, ppos);
172 if (write && ret == 0)
173 ret = tcp_set_default_congestion_control(val);
177 static int proc_tcp_available_congestion_control(struct ctl_table *ctl,
179 void __user *buffer, size_t *lenp,
182 struct ctl_table tbl = { .maxlen = TCP_CA_BUF_MAX, };
185 tbl.data = kmalloc(tbl.maxlen, GFP_USER);
188 tcp_get_available_congestion_control(tbl.data, TCP_CA_BUF_MAX);
189 ret = proc_dostring(&tbl, write, buffer, lenp, ppos);
194 static int proc_allowed_congestion_control(struct ctl_table *ctl,
196 void __user *buffer, size_t *lenp,
199 struct ctl_table tbl = { .maxlen = TCP_CA_BUF_MAX };
202 tbl.data = kmalloc(tbl.maxlen, GFP_USER);
206 tcp_get_allowed_congestion_control(tbl.data, tbl.maxlen);
207 ret = proc_dostring(&tbl, write, buffer, lenp, ppos);
208 if (write && ret == 0)
209 ret = tcp_set_allowed_congestion_control(tbl.data);
214 static int proc_tcp_fastopen_key(struct ctl_table *ctl, int write,
215 void __user *buffer, size_t *lenp,
218 struct ctl_table tbl = { .maxlen = (TCP_FASTOPEN_KEY_LENGTH * 2 + 10) };
219 struct tcp_fastopen_context *ctxt;
220 u32 user_key[4]; /* 16 bytes, matching TCP_FASTOPEN_KEY_LENGTH */
224 tbl.data = kmalloc(tbl.maxlen, GFP_KERNEL);
229 ctxt = rcu_dereference(tcp_fastopen_ctx);
231 memcpy(key, ctxt->key, TCP_FASTOPEN_KEY_LENGTH);
233 memset(key, 0, sizeof(key));
236 for (i = 0; i < ARRAY_SIZE(key); i++)
237 user_key[i] = le32_to_cpu(key[i]);
239 snprintf(tbl.data, tbl.maxlen, "%08x-%08x-%08x-%08x",
240 user_key[0], user_key[1], user_key[2], user_key[3]);
241 ret = proc_dostring(&tbl, write, buffer, lenp, ppos);
243 if (write && ret == 0) {
244 if (sscanf(tbl.data, "%x-%x-%x-%x", user_key, user_key + 1,
245 user_key + 2, user_key + 3) != 4) {
249 /* Generate a dummy secret but don't publish it. This
250 * is needed so we don't regenerate a new key on the
251 * first invocation of tcp_fastopen_cookie_gen
253 tcp_fastopen_init_key_once(false);
255 for (i = 0; i < ARRAY_SIZE(user_key); i++)
256 key[i] = cpu_to_le32(user_key[i]);
258 tcp_fastopen_reset_cipher(key, TCP_FASTOPEN_KEY_LENGTH);
262 pr_debug("proc FO key set 0x%x-%x-%x-%x <- 0x%s: %u\n",
263 user_key[0], user_key[1], user_key[2], user_key[3],
264 (char *)tbl.data, ret);
269 static struct ctl_table ipv4_table[] = {
271 .procname = "tcp_timestamps",
272 .data = &sysctl_tcp_timestamps,
273 .maxlen = sizeof(int),
275 .proc_handler = proc_dointvec
278 .procname = "tcp_window_scaling",
279 .data = &sysctl_tcp_window_scaling,
280 .maxlen = sizeof(int),
282 .proc_handler = proc_dointvec
285 .procname = "tcp_sack",
286 .data = &sysctl_tcp_sack,
287 .maxlen = sizeof(int),
289 .proc_handler = proc_dointvec
292 .procname = "tcp_retrans_collapse",
293 .data = &sysctl_tcp_retrans_collapse,
294 .maxlen = sizeof(int),
296 .proc_handler = proc_dointvec
299 .procname = "ip_default_ttl",
300 .data = &sysctl_ip_default_ttl,
301 .maxlen = sizeof(int),
303 .proc_handler = proc_dointvec_minmax,
304 .extra1 = &ip_ttl_min,
305 .extra2 = &ip_ttl_max,
308 .procname = "tcp_syn_retries",
309 .data = &sysctl_tcp_syn_retries,
310 .maxlen = sizeof(int),
312 .proc_handler = proc_dointvec_minmax,
313 .extra1 = &tcp_syn_retries_min,
314 .extra2 = &tcp_syn_retries_max
317 .procname = "tcp_synack_retries",
318 .data = &sysctl_tcp_synack_retries,
319 .maxlen = sizeof(int),
321 .proc_handler = proc_dointvec
324 .procname = "tcp_max_orphans",
325 .data = &sysctl_tcp_max_orphans,
326 .maxlen = sizeof(int),
328 .proc_handler = proc_dointvec
331 .procname = "tcp_max_tw_buckets",
332 .data = &tcp_death_row.sysctl_max_tw_buckets,
333 .maxlen = sizeof(int),
335 .proc_handler = proc_dointvec
338 .procname = "ip_early_demux",
339 .data = &sysctl_ip_early_demux,
340 .maxlen = sizeof(int),
342 .proc_handler = proc_dointvec
345 .procname = "ip_dynaddr",
346 .data = &sysctl_ip_dynaddr,
347 .maxlen = sizeof(int),
349 .proc_handler = proc_dointvec
352 .procname = "tcp_keepalive_time",
353 .data = &sysctl_tcp_keepalive_time,
354 .maxlen = sizeof(int),
356 .proc_handler = proc_dointvec_jiffies,
359 .procname = "tcp_keepalive_probes",
360 .data = &sysctl_tcp_keepalive_probes,
361 .maxlen = sizeof(int),
363 .proc_handler = proc_dointvec
366 .procname = "tcp_keepalive_intvl",
367 .data = &sysctl_tcp_keepalive_intvl,
368 .maxlen = sizeof(int),
370 .proc_handler = proc_dointvec_jiffies,
373 .procname = "tcp_retries1",
374 .data = &sysctl_tcp_retries1,
375 .maxlen = sizeof(int),
377 .proc_handler = proc_dointvec_minmax,
378 .extra2 = &tcp_retr1_max
381 .procname = "tcp_retries2",
382 .data = &sysctl_tcp_retries2,
383 .maxlen = sizeof(int),
385 .proc_handler = proc_dointvec
388 .procname = "tcp_fin_timeout",
389 .data = &sysctl_tcp_fin_timeout,
390 .maxlen = sizeof(int),
392 .proc_handler = proc_dointvec_jiffies,
394 #ifdef CONFIG_SYN_COOKIES
396 .procname = "tcp_syncookies",
397 .data = &sysctl_tcp_syncookies,
398 .maxlen = sizeof(int),
400 .proc_handler = proc_dointvec
404 .procname = "tcp_fastopen",
405 .data = &sysctl_tcp_fastopen,
406 .maxlen = sizeof(int),
408 .proc_handler = proc_dointvec,
411 .procname = "tcp_fastopen_key",
413 .maxlen = ((TCP_FASTOPEN_KEY_LENGTH * 2) + 10),
414 .proc_handler = proc_tcp_fastopen_key,
417 .procname = "tcp_tw_recycle",
418 .data = &tcp_death_row.sysctl_tw_recycle,
419 .maxlen = sizeof(int),
421 .proc_handler = proc_dointvec
424 .procname = "tcp_abort_on_overflow",
425 .data = &sysctl_tcp_abort_on_overflow,
426 .maxlen = sizeof(int),
428 .proc_handler = proc_dointvec
431 .procname = "tcp_stdurg",
432 .data = &sysctl_tcp_stdurg,
433 .maxlen = sizeof(int),
435 .proc_handler = proc_dointvec
438 .procname = "tcp_rfc1337",
439 .data = &sysctl_tcp_rfc1337,
440 .maxlen = sizeof(int),
442 .proc_handler = proc_dointvec
445 .procname = "tcp_max_syn_backlog",
446 .data = &sysctl_max_syn_backlog,
447 .maxlen = sizeof(int),
449 .proc_handler = proc_dointvec
452 .procname = "igmp_max_memberships",
453 .data = &sysctl_igmp_max_memberships,
454 .maxlen = sizeof(int),
456 .proc_handler = proc_dointvec
459 .procname = "igmp_max_msf",
460 .data = &sysctl_igmp_max_msf,
461 .maxlen = sizeof(int),
463 .proc_handler = proc_dointvec
465 #ifdef CONFIG_IP_MULTICAST
467 .procname = "igmp_qrv",
468 .data = &sysctl_igmp_qrv,
469 .maxlen = sizeof(int),
471 .proc_handler = proc_dointvec_minmax,
476 .procname = "inet_peer_threshold",
477 .data = &inet_peer_threshold,
478 .maxlen = sizeof(int),
480 .proc_handler = proc_dointvec
483 .procname = "inet_peer_minttl",
484 .data = &inet_peer_minttl,
485 .maxlen = sizeof(int),
487 .proc_handler = proc_dointvec_jiffies,
490 .procname = "inet_peer_maxttl",
491 .data = &inet_peer_maxttl,
492 .maxlen = sizeof(int),
494 .proc_handler = proc_dointvec_jiffies,
497 .procname = "tcp_orphan_retries",
498 .data = &sysctl_tcp_orphan_retries,
499 .maxlen = sizeof(int),
501 .proc_handler = proc_dointvec
504 .procname = "tcp_fack",
505 .data = &sysctl_tcp_fack,
506 .maxlen = sizeof(int),
508 .proc_handler = proc_dointvec
511 .procname = "tcp_recovery",
512 .data = &sysctl_tcp_recovery,
513 .maxlen = sizeof(int),
515 .proc_handler = proc_dointvec,
518 .procname = "tcp_reordering",
519 .data = &sysctl_tcp_reordering,
520 .maxlen = sizeof(int),
522 .proc_handler = proc_dointvec
525 .procname = "tcp_max_reordering",
526 .data = &sysctl_tcp_max_reordering,
527 .maxlen = sizeof(int),
529 .proc_handler = proc_dointvec
532 .procname = "tcp_dsack",
533 .data = &sysctl_tcp_dsack,
534 .maxlen = sizeof(int),
536 .proc_handler = proc_dointvec
539 .procname = "tcp_mem",
540 .maxlen = sizeof(sysctl_tcp_mem),
541 .data = &sysctl_tcp_mem,
543 .proc_handler = proc_doulongvec_minmax,
546 .procname = "tcp_wmem",
547 .data = &sysctl_tcp_wmem,
548 .maxlen = sizeof(sysctl_tcp_wmem),
550 .proc_handler = proc_dointvec_minmax,
554 .procname = "tcp_notsent_lowat",
555 .data = &sysctl_tcp_notsent_lowat,
556 .maxlen = sizeof(sysctl_tcp_notsent_lowat),
558 .proc_handler = proc_dointvec,
561 .procname = "tcp_rmem",
562 .data = &sysctl_tcp_rmem,
563 .maxlen = sizeof(sysctl_tcp_rmem),
565 .proc_handler = proc_dointvec_minmax,
569 .procname = "tcp_app_win",
570 .data = &sysctl_tcp_app_win,
571 .maxlen = sizeof(int),
573 .proc_handler = proc_dointvec
576 .procname = "tcp_adv_win_scale",
577 .data = &sysctl_tcp_adv_win_scale,
578 .maxlen = sizeof(int),
580 .proc_handler = proc_dointvec_minmax,
581 .extra1 = &tcp_adv_win_scale_min,
582 .extra2 = &tcp_adv_win_scale_max,
585 .procname = "tcp_tw_reuse",
586 .data = &sysctl_tcp_tw_reuse,
587 .maxlen = sizeof(int),
589 .proc_handler = proc_dointvec
592 .procname = "tcp_frto",
593 .data = &sysctl_tcp_frto,
594 .maxlen = sizeof(int),
596 .proc_handler = proc_dointvec
599 .procname = "tcp_min_rtt_wlen",
600 .data = &sysctl_tcp_min_rtt_wlen,
601 .maxlen = sizeof(int),
603 .proc_handler = proc_dointvec_minmax,
605 .extra2 = &one_day_secs
608 .procname = "tcp_low_latency",
609 .data = &sysctl_tcp_low_latency,
610 .maxlen = sizeof(int),
612 .proc_handler = proc_dointvec
615 .procname = "tcp_no_metrics_save",
616 .data = &sysctl_tcp_nometrics_save,
617 .maxlen = sizeof(int),
619 .proc_handler = proc_dointvec,
622 .procname = "tcp_moderate_rcvbuf",
623 .data = &sysctl_tcp_moderate_rcvbuf,
624 .maxlen = sizeof(int),
626 .proc_handler = proc_dointvec,
629 .procname = "tcp_tso_win_divisor",
630 .data = &sysctl_tcp_tso_win_divisor,
631 .maxlen = sizeof(int),
633 .proc_handler = proc_dointvec,
636 .procname = "tcp_congestion_control",
638 .maxlen = TCP_CA_NAME_MAX,
639 .proc_handler = proc_tcp_congestion_control,
642 .procname = "tcp_workaround_signed_windows",
643 .data = &sysctl_tcp_workaround_signed_windows,
644 .maxlen = sizeof(int),
646 .proc_handler = proc_dointvec
649 .procname = "tcp_limit_output_bytes",
650 .data = &sysctl_tcp_limit_output_bytes,
651 .maxlen = sizeof(int),
653 .proc_handler = proc_dointvec
656 .procname = "tcp_challenge_ack_limit",
657 .data = &sysctl_tcp_challenge_ack_limit,
658 .maxlen = sizeof(int),
660 .proc_handler = proc_dointvec
663 .procname = "tcp_slow_start_after_idle",
664 .data = &sysctl_tcp_slow_start_after_idle,
665 .maxlen = sizeof(int),
667 .proc_handler = proc_dointvec
669 #ifdef CONFIG_NETLABEL
671 .procname = "cipso_cache_enable",
672 .data = &cipso_v4_cache_enabled,
673 .maxlen = sizeof(int),
675 .proc_handler = proc_dointvec,
678 .procname = "cipso_cache_bucket_size",
679 .data = &cipso_v4_cache_bucketsize,
680 .maxlen = sizeof(int),
682 .proc_handler = proc_dointvec,
685 .procname = "cipso_rbm_optfmt",
686 .data = &cipso_v4_rbm_optfmt,
687 .maxlen = sizeof(int),
689 .proc_handler = proc_dointvec,
692 .procname = "cipso_rbm_strictvalid",
693 .data = &cipso_v4_rbm_strictvalid,
694 .maxlen = sizeof(int),
696 .proc_handler = proc_dointvec,
698 #endif /* CONFIG_NETLABEL */
700 .procname = "tcp_available_congestion_control",
701 .maxlen = TCP_CA_BUF_MAX,
703 .proc_handler = proc_tcp_available_congestion_control,
706 .procname = "tcp_allowed_congestion_control",
707 .maxlen = TCP_CA_BUF_MAX,
709 .proc_handler = proc_allowed_congestion_control,
712 .procname = "tcp_thin_linear_timeouts",
713 .data = &sysctl_tcp_thin_linear_timeouts,
714 .maxlen = sizeof(int),
716 .proc_handler = proc_dointvec
719 .procname = "tcp_thin_dupack",
720 .data = &sysctl_tcp_thin_dupack,
721 .maxlen = sizeof(int),
723 .proc_handler = proc_dointvec
726 .procname = "tcp_early_retrans",
727 .data = &sysctl_tcp_early_retrans,
728 .maxlen = sizeof(int),
730 .proc_handler = proc_dointvec_minmax,
735 .procname = "tcp_min_tso_segs",
736 .data = &sysctl_tcp_min_tso_segs,
737 .maxlen = sizeof(int),
739 .proc_handler = proc_dointvec_minmax,
741 .extra2 = &gso_max_segs,
744 .procname = "tcp_pacing_ss_ratio",
745 .data = &sysctl_tcp_pacing_ss_ratio,
746 .maxlen = sizeof(int),
748 .proc_handler = proc_dointvec_minmax,
753 .procname = "tcp_pacing_ca_ratio",
754 .data = &sysctl_tcp_pacing_ca_ratio,
755 .maxlen = sizeof(int),
757 .proc_handler = proc_dointvec_minmax,
762 .procname = "tcp_autocorking",
763 .data = &sysctl_tcp_autocorking,
764 .maxlen = sizeof(int),
766 .proc_handler = proc_dointvec_minmax,
771 .procname = "tcp_invalid_ratelimit",
772 .data = &sysctl_tcp_invalid_ratelimit,
773 .maxlen = sizeof(int),
775 .proc_handler = proc_dointvec_ms_jiffies,
778 .procname = "icmp_msgs_per_sec",
779 .data = &sysctl_icmp_msgs_per_sec,
780 .maxlen = sizeof(int),
782 .proc_handler = proc_dointvec_minmax,
786 .procname = "icmp_msgs_burst",
787 .data = &sysctl_icmp_msgs_burst,
788 .maxlen = sizeof(int),
790 .proc_handler = proc_dointvec_minmax,
794 .procname = "udp_mem",
795 .data = &sysctl_udp_mem,
796 .maxlen = sizeof(sysctl_udp_mem),
798 .proc_handler = proc_doulongvec_minmax,
801 .procname = "udp_rmem_min",
802 .data = &sysctl_udp_rmem_min,
803 .maxlen = sizeof(sysctl_udp_rmem_min),
805 .proc_handler = proc_dointvec_minmax,
809 .procname = "udp_wmem_min",
810 .data = &sysctl_udp_wmem_min,
811 .maxlen = sizeof(sysctl_udp_wmem_min),
813 .proc_handler = proc_dointvec_minmax,
819 static struct ctl_table ipv4_net_table[] = {
821 .procname = "icmp_echo_ignore_all",
822 .data = &init_net.ipv4.sysctl_icmp_echo_ignore_all,
823 .maxlen = sizeof(int),
825 .proc_handler = proc_dointvec
828 .procname = "icmp_echo_ignore_broadcasts",
829 .data = &init_net.ipv4.sysctl_icmp_echo_ignore_broadcasts,
830 .maxlen = sizeof(int),
832 .proc_handler = proc_dointvec
835 .procname = "icmp_ignore_bogus_error_responses",
836 .data = &init_net.ipv4.sysctl_icmp_ignore_bogus_error_responses,
837 .maxlen = sizeof(int),
839 .proc_handler = proc_dointvec
842 .procname = "icmp_errors_use_inbound_ifaddr",
843 .data = &init_net.ipv4.sysctl_icmp_errors_use_inbound_ifaddr,
844 .maxlen = sizeof(int),
846 .proc_handler = proc_dointvec
849 .procname = "icmp_ratelimit",
850 .data = &init_net.ipv4.sysctl_icmp_ratelimit,
851 .maxlen = sizeof(int),
853 .proc_handler = proc_dointvec_ms_jiffies,
856 .procname = "icmp_ratemask",
857 .data = &init_net.ipv4.sysctl_icmp_ratemask,
858 .maxlen = sizeof(int),
860 .proc_handler = proc_dointvec
863 .procname = "ping_group_range",
864 .data = &init_net.ipv4.ping_group_range.range,
865 .maxlen = sizeof(gid_t)*2,
867 .proc_handler = ipv4_ping_group_range,
870 .procname = "tcp_ecn",
871 .data = &init_net.ipv4.sysctl_tcp_ecn,
872 .maxlen = sizeof(int),
874 .proc_handler = proc_dointvec
877 .procname = "tcp_ecn_fallback",
878 .data = &init_net.ipv4.sysctl_tcp_ecn_fallback,
879 .maxlen = sizeof(int),
881 .proc_handler = proc_dointvec
884 .procname = "ip_local_port_range",
885 .maxlen = sizeof(init_net.ipv4.ip_local_ports.range),
886 .data = &init_net.ipv4.ip_local_ports.range,
888 .proc_handler = ipv4_local_port_range,
891 .procname = "ip_local_reserved_ports",
892 .data = &init_net.ipv4.sysctl_local_reserved_ports,
895 .proc_handler = proc_do_large_bitmap,
898 .procname = "ip_no_pmtu_disc",
899 .data = &init_net.ipv4.sysctl_ip_no_pmtu_disc,
900 .maxlen = sizeof(int),
902 .proc_handler = proc_dointvec
905 .procname = "ip_forward_use_pmtu",
906 .data = &init_net.ipv4.sysctl_ip_fwd_use_pmtu,
907 .maxlen = sizeof(int),
909 .proc_handler = proc_dointvec,
912 .procname = "ip_nonlocal_bind",
913 .data = &init_net.ipv4.sysctl_ip_nonlocal_bind,
914 .maxlen = sizeof(int),
916 .proc_handler = proc_dointvec
919 .procname = "fwmark_reflect",
920 .data = &init_net.ipv4.sysctl_fwmark_reflect,
921 .maxlen = sizeof(int),
923 .proc_handler = proc_dointvec,
926 .procname = "tcp_fwmark_accept",
927 .data = &init_net.ipv4.sysctl_tcp_fwmark_accept,
928 .maxlen = sizeof(int),
930 .proc_handler = proc_dointvec,
933 .procname = "tcp_mtu_probing",
934 .data = &init_net.ipv4.sysctl_tcp_mtu_probing,
935 .maxlen = sizeof(int),
937 .proc_handler = proc_dointvec,
940 .procname = "tcp_base_mss",
941 .data = &init_net.ipv4.sysctl_tcp_base_mss,
942 .maxlen = sizeof(int),
944 .proc_handler = proc_dointvec,
947 .procname = "tcp_min_snd_mss",
948 .data = &init_net.ipv4.sysctl_tcp_min_snd_mss,
949 .maxlen = sizeof(int),
951 .proc_handler = proc_dointvec_minmax,
952 .extra1 = &tcp_min_snd_mss_min,
953 .extra2 = &tcp_min_snd_mss_max,
956 .procname = "tcp_probe_threshold",
957 .data = &init_net.ipv4.sysctl_tcp_probe_threshold,
958 .maxlen = sizeof(int),
960 .proc_handler = proc_dointvec,
963 .procname = "tcp_probe_interval",
964 .data = &init_net.ipv4.sysctl_tcp_probe_interval,
965 .maxlen = sizeof(int),
967 .proc_handler = proc_dointvec,
970 .procname = "igmp_link_local_mcast_reports",
971 .data = &sysctl_igmp_llm_reports,
972 .maxlen = sizeof(int),
974 .proc_handler = proc_dointvec
979 static __net_init int ipv4_sysctl_init_net(struct net *net)
981 struct ctl_table *table;
983 table = ipv4_net_table;
984 if (!net_eq(net, &init_net)) {
987 table = kmemdup(table, sizeof(ipv4_net_table), GFP_KERNEL);
991 /* Update the variables to point into the current struct net */
992 for (i = 0; i < ARRAY_SIZE(ipv4_net_table) - 1; i++)
993 table[i].data += (void *)net - (void *)&init_net;
996 net->ipv4.ipv4_hdr = register_net_sysctl(net, "net/ipv4", table);
997 if (!net->ipv4.ipv4_hdr)
1000 net->ipv4.sysctl_local_reserved_ports = kzalloc(65536 / 8, GFP_KERNEL);
1001 if (!net->ipv4.sysctl_local_reserved_ports)
1007 unregister_net_sysctl_table(net->ipv4.ipv4_hdr);
1009 if (!net_eq(net, &init_net))
1015 static __net_exit void ipv4_sysctl_exit_net(struct net *net)
1017 struct ctl_table *table;
1019 kfree(net->ipv4.sysctl_local_reserved_ports);
1020 table = net->ipv4.ipv4_hdr->ctl_table_arg;
1021 unregister_net_sysctl_table(net->ipv4.ipv4_hdr);
1025 static __net_initdata struct pernet_operations ipv4_sysctl_ops = {
1026 .init = ipv4_sysctl_init_net,
1027 .exit = ipv4_sysctl_exit_net,
1030 static __init int sysctl_ipv4_init(void)
1032 struct ctl_table_header *hdr;
1034 hdr = register_net_sysctl(&init_net, "net/ipv4", ipv4_table);
1038 if (register_pernet_subsys(&ipv4_sysctl_ops)) {
1039 unregister_net_sysctl_table(hdr);
1046 __initcall(sysctl_ipv4_init);