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 ip_ttl_min = 1;
40 static int ip_ttl_max = 255;
41 static int tcp_syn_retries_min = 1;
42 static int tcp_syn_retries_max = MAX_TCP_SYNCNT;
43 static int ip_ping_group_range_min[] = { 0, 0 };
44 static int ip_ping_group_range_max[] = { GID_T_MAX, GID_T_MAX };
46 /* Update system visible IP port range */
47 static void set_local_port_range(struct net *net, int range[2])
49 bool same_parity = !((range[0] ^ range[1]) & 1);
51 write_seqlock_bh(&net->ipv4.ip_local_ports.lock);
52 if (same_parity && !net->ipv4.ip_local_ports.warned) {
53 net->ipv4.ip_local_ports.warned = true;
54 pr_err_ratelimited("ip_local_port_range: prefer different parity for start/end values.\n");
56 net->ipv4.ip_local_ports.range[0] = range[0];
57 net->ipv4.ip_local_ports.range[1] = range[1];
58 write_sequnlock_bh(&net->ipv4.ip_local_ports.lock);
61 /* Validate changes from /proc interface. */
62 static int ipv4_local_port_range(struct ctl_table *table, int write,
64 size_t *lenp, loff_t *ppos)
67 container_of(table->data, struct net, ipv4.ip_local_ports.range);
70 struct ctl_table tmp = {
72 .maxlen = sizeof(range),
74 .extra1 = &ip_local_port_range_min,
75 .extra2 = &ip_local_port_range_max,
78 inet_get_local_port_range(net, &range[0], &range[1]);
80 ret = proc_dointvec_minmax(&tmp, write, buffer, lenp, ppos);
82 if (write && ret == 0) {
83 if (range[1] < range[0])
86 set_local_port_range(net, range);
93 static void inet_get_ping_group_range_table(struct ctl_table *table, kgid_t *low, kgid_t *high)
95 kgid_t *data = table->data;
97 container_of(table->data, struct net, ipv4.ping_group_range.range);
100 seq = read_seqbegin(&net->ipv4.ping_group_range.lock);
104 } while (read_seqretry(&net->ipv4.ping_group_range.lock, seq));
107 /* Update system visible IP port range */
108 static void set_ping_group_range(struct ctl_table *table, kgid_t low, kgid_t high)
110 kgid_t *data = table->data;
112 container_of(table->data, struct net, ipv4.ping_group_range.range);
113 write_seqlock(&net->ipv4.ping_group_range.lock);
116 write_sequnlock(&net->ipv4.ping_group_range.lock);
119 /* Validate changes from /proc interface. */
120 static int ipv4_ping_group_range(struct ctl_table *table, int write,
122 size_t *lenp, loff_t *ppos)
124 struct user_namespace *user_ns = current_user_ns();
128 struct ctl_table tmp = {
130 .maxlen = sizeof(urange),
132 .extra1 = &ip_ping_group_range_min,
133 .extra2 = &ip_ping_group_range_max,
136 inet_get_ping_group_range_table(table, &low, &high);
137 urange[0] = from_kgid_munged(user_ns, low);
138 urange[1] = from_kgid_munged(user_ns, high);
139 ret = proc_dointvec_minmax(&tmp, write, buffer, lenp, ppos);
141 if (write && ret == 0) {
142 low = make_kgid(user_ns, urange[0]);
143 high = make_kgid(user_ns, urange[1]);
144 if (!gid_valid(low) || !gid_valid(high) ||
145 (urange[1] < urange[0]) || gid_lt(high, low)) {
146 low = make_kgid(&init_user_ns, 1);
147 high = make_kgid(&init_user_ns, 0);
149 set_ping_group_range(table, low, high);
155 /* Validate changes from /proc interface. */
156 static int proc_tcp_default_init_rwnd(struct ctl_table *ctl, int write,
158 size_t *lenp, loff_t *ppos)
160 int old_value = *(int *)ctl->data;
161 int ret = proc_dointvec(ctl, write, buffer, lenp, ppos);
162 int new_value = *(int *)ctl->data;
164 if (write && ret == 0 && (new_value < 3 || new_value > 100))
165 *(int *)ctl->data = old_value;
170 static int proc_tcp_congestion_control(struct ctl_table *ctl, int write,
171 void __user *buffer, size_t *lenp, loff_t *ppos)
173 char val[TCP_CA_NAME_MAX];
174 struct ctl_table tbl = {
176 .maxlen = TCP_CA_NAME_MAX,
180 tcp_get_default_congestion_control(val);
182 ret = proc_dostring(&tbl, write, buffer, lenp, ppos);
183 if (write && ret == 0)
184 ret = tcp_set_default_congestion_control(val);
188 static int proc_tcp_available_congestion_control(struct ctl_table *ctl,
190 void __user *buffer, size_t *lenp,
193 struct ctl_table tbl = { .maxlen = TCP_CA_BUF_MAX, };
196 tbl.data = kmalloc(tbl.maxlen, GFP_USER);
199 tcp_get_available_congestion_control(tbl.data, TCP_CA_BUF_MAX);
200 ret = proc_dostring(&tbl, write, buffer, lenp, ppos);
205 static int proc_allowed_congestion_control(struct ctl_table *ctl,
207 void __user *buffer, size_t *lenp,
210 struct ctl_table tbl = { .maxlen = TCP_CA_BUF_MAX };
213 tbl.data = kmalloc(tbl.maxlen, GFP_USER);
217 tcp_get_allowed_congestion_control(tbl.data, tbl.maxlen);
218 ret = proc_dostring(&tbl, write, buffer, lenp, ppos);
219 if (write && ret == 0)
220 ret = tcp_set_allowed_congestion_control(tbl.data);
225 static int proc_tcp_fastopen_key(struct ctl_table *ctl, int write,
226 void __user *buffer, size_t *lenp,
229 struct ctl_table tbl = { .maxlen = (TCP_FASTOPEN_KEY_LENGTH * 2 + 10) };
230 struct tcp_fastopen_context *ctxt;
232 u32 user_key[4]; /* 16 bytes, matching TCP_FASTOPEN_KEY_LENGTH */
234 tbl.data = kmalloc(tbl.maxlen, GFP_KERNEL);
239 ctxt = rcu_dereference(tcp_fastopen_ctx);
241 memcpy(user_key, ctxt->key, TCP_FASTOPEN_KEY_LENGTH);
243 memset(user_key, 0, sizeof(user_key));
246 snprintf(tbl.data, tbl.maxlen, "%08x-%08x-%08x-%08x",
247 user_key[0], user_key[1], user_key[2], user_key[3]);
248 ret = proc_dostring(&tbl, write, buffer, lenp, ppos);
250 if (write && ret == 0) {
251 if (sscanf(tbl.data, "%x-%x-%x-%x", user_key, user_key + 1,
252 user_key + 2, user_key + 3) != 4) {
256 /* Generate a dummy secret but don't publish it. This
257 * is needed so we don't regenerate a new key on the
258 * first invocation of tcp_fastopen_cookie_gen
260 tcp_fastopen_init_key_once(false);
261 tcp_fastopen_reset_cipher(user_key, TCP_FASTOPEN_KEY_LENGTH);
265 pr_debug("proc FO key set 0x%x-%x-%x-%x <- 0x%s: %u\n",
266 user_key[0], user_key[1], user_key[2], user_key[3],
267 (char *)tbl.data, ret);
272 static struct ctl_table ipv4_table[] = {
274 .procname = "tcp_timestamps",
275 .data = &sysctl_tcp_timestamps,
276 .maxlen = sizeof(int),
278 .proc_handler = proc_dointvec
281 .procname = "tcp_window_scaling",
282 .data = &sysctl_tcp_window_scaling,
283 .maxlen = sizeof(int),
285 .proc_handler = proc_dointvec
288 .procname = "tcp_sack",
289 .data = &sysctl_tcp_sack,
290 .maxlen = sizeof(int),
292 .proc_handler = proc_dointvec
295 .procname = "tcp_retrans_collapse",
296 .data = &sysctl_tcp_retrans_collapse,
297 .maxlen = sizeof(int),
299 .proc_handler = proc_dointvec
302 .procname = "ip_default_ttl",
303 .data = &sysctl_ip_default_ttl,
304 .maxlen = sizeof(int),
306 .proc_handler = proc_dointvec_minmax,
307 .extra1 = &ip_ttl_min,
308 .extra2 = &ip_ttl_max,
311 .procname = "tcp_syn_retries",
312 .data = &sysctl_tcp_syn_retries,
313 .maxlen = sizeof(int),
315 .proc_handler = proc_dointvec_minmax,
316 .extra1 = &tcp_syn_retries_min,
317 .extra2 = &tcp_syn_retries_max
320 .procname = "tcp_synack_retries",
321 .data = &sysctl_tcp_synack_retries,
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_max_tw_buckets",
335 .data = &tcp_death_row.sysctl_max_tw_buckets,
336 .maxlen = sizeof(int),
338 .proc_handler = proc_dointvec
341 .procname = "ip_early_demux",
342 .data = &sysctl_ip_early_demux,
343 .maxlen = sizeof(int),
345 .proc_handler = proc_dointvec
348 .procname = "ip_dynaddr",
349 .data = &sysctl_ip_dynaddr,
350 .maxlen = sizeof(int),
352 .proc_handler = proc_dointvec
355 .procname = "tcp_keepalive_time",
356 .data = &sysctl_tcp_keepalive_time,
357 .maxlen = sizeof(int),
359 .proc_handler = proc_dointvec_jiffies,
362 .procname = "tcp_keepalive_probes",
363 .data = &sysctl_tcp_keepalive_probes,
364 .maxlen = sizeof(int),
366 .proc_handler = proc_dointvec
369 .procname = "tcp_keepalive_intvl",
370 .data = &sysctl_tcp_keepalive_intvl,
371 .maxlen = sizeof(int),
373 .proc_handler = proc_dointvec_jiffies,
376 .procname = "tcp_retries1",
377 .data = &sysctl_tcp_retries1,
378 .maxlen = sizeof(int),
380 .proc_handler = proc_dointvec_minmax,
381 .extra2 = &tcp_retr1_max
384 .procname = "tcp_retries2",
385 .data = &sysctl_tcp_retries2,
386 .maxlen = sizeof(int),
388 .proc_handler = proc_dointvec
391 .procname = "tcp_fin_timeout",
392 .data = &sysctl_tcp_fin_timeout,
393 .maxlen = sizeof(int),
395 .proc_handler = proc_dointvec_jiffies,
397 #ifdef CONFIG_SYN_COOKIES
399 .procname = "tcp_syncookies",
400 .data = &sysctl_tcp_syncookies,
401 .maxlen = sizeof(int),
403 .proc_handler = proc_dointvec
407 .procname = "tcp_fastopen",
408 .data = &sysctl_tcp_fastopen,
409 .maxlen = sizeof(int),
411 .proc_handler = proc_dointvec,
414 .procname = "tcp_fastopen_key",
416 .maxlen = ((TCP_FASTOPEN_KEY_LENGTH * 2) + 10),
417 .proc_handler = proc_tcp_fastopen_key,
420 .procname = "tcp_tw_recycle",
421 .data = &tcp_death_row.sysctl_tw_recycle,
422 .maxlen = sizeof(int),
424 .proc_handler = proc_dointvec
427 .procname = "tcp_abort_on_overflow",
428 .data = &sysctl_tcp_abort_on_overflow,
429 .maxlen = sizeof(int),
431 .proc_handler = proc_dointvec
434 .procname = "tcp_stdurg",
435 .data = &sysctl_tcp_stdurg,
436 .maxlen = sizeof(int),
438 .proc_handler = proc_dointvec
441 .procname = "tcp_rfc1337",
442 .data = &sysctl_tcp_rfc1337,
443 .maxlen = sizeof(int),
445 .proc_handler = proc_dointvec
448 .procname = "tcp_max_syn_backlog",
449 .data = &sysctl_max_syn_backlog,
450 .maxlen = sizeof(int),
452 .proc_handler = proc_dointvec
455 .procname = "igmp_max_memberships",
456 .data = &sysctl_igmp_max_memberships,
457 .maxlen = sizeof(int),
459 .proc_handler = proc_dointvec
462 .procname = "igmp_max_msf",
463 .data = &sysctl_igmp_max_msf,
464 .maxlen = sizeof(int),
466 .proc_handler = proc_dointvec
468 #ifdef CONFIG_IP_MULTICAST
470 .procname = "igmp_qrv",
471 .data = &sysctl_igmp_qrv,
472 .maxlen = sizeof(int),
474 .proc_handler = proc_dointvec_minmax,
479 .procname = "inet_peer_threshold",
480 .data = &inet_peer_threshold,
481 .maxlen = sizeof(int),
483 .proc_handler = proc_dointvec
486 .procname = "inet_peer_minttl",
487 .data = &inet_peer_minttl,
488 .maxlen = sizeof(int),
490 .proc_handler = proc_dointvec_jiffies,
493 .procname = "inet_peer_maxttl",
494 .data = &inet_peer_maxttl,
495 .maxlen = sizeof(int),
497 .proc_handler = proc_dointvec_jiffies,
500 .procname = "tcp_orphan_retries",
501 .data = &sysctl_tcp_orphan_retries,
502 .maxlen = sizeof(int),
504 .proc_handler = proc_dointvec
507 .procname = "tcp_fack",
508 .data = &sysctl_tcp_fack,
509 .maxlen = sizeof(int),
511 .proc_handler = proc_dointvec
514 .procname = "tcp_recovery",
515 .data = &sysctl_tcp_recovery,
516 .maxlen = sizeof(int),
518 .proc_handler = proc_dointvec,
521 .procname = "tcp_reordering",
522 .data = &sysctl_tcp_reordering,
523 .maxlen = sizeof(int),
525 .proc_handler = proc_dointvec
528 .procname = "tcp_max_reordering",
529 .data = &sysctl_tcp_max_reordering,
530 .maxlen = sizeof(int),
532 .proc_handler = proc_dointvec
535 .procname = "tcp_dsack",
536 .data = &sysctl_tcp_dsack,
537 .maxlen = sizeof(int),
539 .proc_handler = proc_dointvec
542 .procname = "tcp_mem",
543 .maxlen = sizeof(sysctl_tcp_mem),
544 .data = &sysctl_tcp_mem,
546 .proc_handler = proc_doulongvec_minmax,
549 .procname = "tcp_wmem",
550 .data = &sysctl_tcp_wmem,
551 .maxlen = sizeof(sysctl_tcp_wmem),
553 .proc_handler = proc_dointvec_minmax,
557 .procname = "tcp_notsent_lowat",
558 .data = &sysctl_tcp_notsent_lowat,
559 .maxlen = sizeof(sysctl_tcp_notsent_lowat),
561 .proc_handler = proc_dointvec,
564 .procname = "tcp_rmem",
565 .data = &sysctl_tcp_rmem,
566 .maxlen = sizeof(sysctl_tcp_rmem),
568 .proc_handler = proc_dointvec_minmax,
572 .procname = "tcp_app_win",
573 .data = &sysctl_tcp_app_win,
574 .maxlen = sizeof(int),
576 .proc_handler = proc_dointvec
579 .procname = "tcp_adv_win_scale",
580 .data = &sysctl_tcp_adv_win_scale,
581 .maxlen = sizeof(int),
583 .proc_handler = proc_dointvec_minmax,
584 .extra1 = &tcp_adv_win_scale_min,
585 .extra2 = &tcp_adv_win_scale_max,
588 .procname = "tcp_tw_reuse",
589 .data = &sysctl_tcp_tw_reuse,
590 .maxlen = sizeof(int),
592 .proc_handler = proc_dointvec
595 .procname = "tcp_frto",
596 .data = &sysctl_tcp_frto,
597 .maxlen = sizeof(int),
599 .proc_handler = proc_dointvec
602 .procname = "tcp_min_rtt_wlen",
603 .data = &sysctl_tcp_min_rtt_wlen,
604 .maxlen = sizeof(int),
606 .proc_handler = proc_dointvec
609 .procname = "tcp_low_latency",
610 .data = &sysctl_tcp_low_latency,
611 .maxlen = sizeof(int),
613 .proc_handler = proc_dointvec
616 .procname = "tcp_no_metrics_save",
617 .data = &sysctl_tcp_nometrics_save,
618 .maxlen = sizeof(int),
620 .proc_handler = proc_dointvec,
623 .procname = "tcp_moderate_rcvbuf",
624 .data = &sysctl_tcp_moderate_rcvbuf,
625 .maxlen = sizeof(int),
627 .proc_handler = proc_dointvec,
630 .procname = "tcp_tso_win_divisor",
631 .data = &sysctl_tcp_tso_win_divisor,
632 .maxlen = sizeof(int),
634 .proc_handler = proc_dointvec,
637 .procname = "tcp_congestion_control",
639 .maxlen = TCP_CA_NAME_MAX,
640 .proc_handler = proc_tcp_congestion_control,
643 .procname = "tcp_workaround_signed_windows",
644 .data = &sysctl_tcp_workaround_signed_windows,
645 .maxlen = sizeof(int),
647 .proc_handler = proc_dointvec
650 .procname = "tcp_limit_output_bytes",
651 .data = &sysctl_tcp_limit_output_bytes,
652 .maxlen = sizeof(int),
654 .proc_handler = proc_dointvec
657 .procname = "tcp_challenge_ack_limit",
658 .data = &sysctl_tcp_challenge_ack_limit,
659 .maxlen = sizeof(int),
661 .proc_handler = proc_dointvec
664 .procname = "tcp_slow_start_after_idle",
665 .data = &sysctl_tcp_slow_start_after_idle,
666 .maxlen = sizeof(int),
668 .proc_handler = proc_dointvec
670 #ifdef CONFIG_NETLABEL
672 .procname = "cipso_cache_enable",
673 .data = &cipso_v4_cache_enabled,
674 .maxlen = sizeof(int),
676 .proc_handler = proc_dointvec,
679 .procname = "cipso_cache_bucket_size",
680 .data = &cipso_v4_cache_bucketsize,
681 .maxlen = sizeof(int),
683 .proc_handler = proc_dointvec,
686 .procname = "cipso_rbm_optfmt",
687 .data = &cipso_v4_rbm_optfmt,
688 .maxlen = sizeof(int),
690 .proc_handler = proc_dointvec,
693 .procname = "cipso_rbm_strictvalid",
694 .data = &cipso_v4_rbm_strictvalid,
695 .maxlen = sizeof(int),
697 .proc_handler = proc_dointvec,
699 #endif /* CONFIG_NETLABEL */
701 .procname = "tcp_available_congestion_control",
702 .maxlen = TCP_CA_BUF_MAX,
704 .proc_handler = proc_tcp_available_congestion_control,
707 .procname = "tcp_allowed_congestion_control",
708 .maxlen = TCP_CA_BUF_MAX,
710 .proc_handler = proc_allowed_congestion_control,
713 .procname = "tcp_thin_linear_timeouts",
714 .data = &sysctl_tcp_thin_linear_timeouts,
715 .maxlen = sizeof(int),
717 .proc_handler = proc_dointvec
720 .procname = "tcp_thin_dupack",
721 .data = &sysctl_tcp_thin_dupack,
722 .maxlen = sizeof(int),
724 .proc_handler = proc_dointvec
727 .procname = "tcp_early_retrans",
728 .data = &sysctl_tcp_early_retrans,
729 .maxlen = sizeof(int),
731 .proc_handler = proc_dointvec_minmax,
736 .procname = "tcp_min_tso_segs",
737 .data = &sysctl_tcp_min_tso_segs,
738 .maxlen = sizeof(int),
740 .proc_handler = proc_dointvec_minmax,
742 .extra2 = &gso_max_segs,
745 .procname = "tcp_pacing_ss_ratio",
746 .data = &sysctl_tcp_pacing_ss_ratio,
747 .maxlen = sizeof(int),
749 .proc_handler = proc_dointvec_minmax,
754 .procname = "tcp_pacing_ca_ratio",
755 .data = &sysctl_tcp_pacing_ca_ratio,
756 .maxlen = sizeof(int),
758 .proc_handler = proc_dointvec_minmax,
763 .procname = "tcp_autocorking",
764 .data = &sysctl_tcp_autocorking,
765 .maxlen = sizeof(int),
767 .proc_handler = proc_dointvec_minmax,
772 .procname = "tcp_invalid_ratelimit",
773 .data = &sysctl_tcp_invalid_ratelimit,
774 .maxlen = sizeof(int),
776 .proc_handler = proc_dointvec_ms_jiffies,
779 .procname = "tcp_default_init_rwnd",
780 .data = &sysctl_tcp_default_init_rwnd,
781 .maxlen = sizeof(int),
783 .proc_handler = proc_tcp_default_init_rwnd
786 .procname = "icmp_msgs_per_sec",
787 .data = &sysctl_icmp_msgs_per_sec,
788 .maxlen = sizeof(int),
790 .proc_handler = proc_dointvec_minmax,
794 .procname = "icmp_msgs_burst",
795 .data = &sysctl_icmp_msgs_burst,
796 .maxlen = sizeof(int),
798 .proc_handler = proc_dointvec_minmax,
802 .procname = "udp_mem",
803 .data = &sysctl_udp_mem,
804 .maxlen = sizeof(sysctl_udp_mem),
806 .proc_handler = proc_doulongvec_minmax,
809 .procname = "udp_rmem_min",
810 .data = &sysctl_udp_rmem_min,
811 .maxlen = sizeof(sysctl_udp_rmem_min),
813 .proc_handler = proc_dointvec_minmax,
817 .procname = "udp_wmem_min",
818 .data = &sysctl_udp_wmem_min,
819 .maxlen = sizeof(sysctl_udp_wmem_min),
821 .proc_handler = proc_dointvec_minmax,
827 static struct ctl_table ipv4_net_table[] = {
829 .procname = "icmp_echo_ignore_all",
830 .data = &init_net.ipv4.sysctl_icmp_echo_ignore_all,
831 .maxlen = sizeof(int),
833 .proc_handler = proc_dointvec
836 .procname = "icmp_echo_ignore_broadcasts",
837 .data = &init_net.ipv4.sysctl_icmp_echo_ignore_broadcasts,
838 .maxlen = sizeof(int),
840 .proc_handler = proc_dointvec
843 .procname = "icmp_ignore_bogus_error_responses",
844 .data = &init_net.ipv4.sysctl_icmp_ignore_bogus_error_responses,
845 .maxlen = sizeof(int),
847 .proc_handler = proc_dointvec
850 .procname = "icmp_errors_use_inbound_ifaddr",
851 .data = &init_net.ipv4.sysctl_icmp_errors_use_inbound_ifaddr,
852 .maxlen = sizeof(int),
854 .proc_handler = proc_dointvec
857 .procname = "icmp_ratelimit",
858 .data = &init_net.ipv4.sysctl_icmp_ratelimit,
859 .maxlen = sizeof(int),
861 .proc_handler = proc_dointvec_ms_jiffies,
864 .procname = "icmp_ratemask",
865 .data = &init_net.ipv4.sysctl_icmp_ratemask,
866 .maxlen = sizeof(int),
868 .proc_handler = proc_dointvec
871 .procname = "ping_group_range",
872 .data = &init_net.ipv4.ping_group_range.range,
873 .maxlen = sizeof(gid_t)*2,
875 .proc_handler = ipv4_ping_group_range,
878 .procname = "tcp_ecn",
879 .data = &init_net.ipv4.sysctl_tcp_ecn,
880 .maxlen = sizeof(int),
882 .proc_handler = proc_dointvec
885 .procname = "tcp_ecn_fallback",
886 .data = &init_net.ipv4.sysctl_tcp_ecn_fallback,
887 .maxlen = sizeof(int),
889 .proc_handler = proc_dointvec
892 .procname = "ip_local_port_range",
893 .maxlen = sizeof(init_net.ipv4.ip_local_ports.range),
894 .data = &init_net.ipv4.ip_local_ports.range,
896 .proc_handler = ipv4_local_port_range,
899 .procname = "ip_local_reserved_ports",
900 .data = &init_net.ipv4.sysctl_local_reserved_ports,
903 .proc_handler = proc_do_large_bitmap,
906 .procname = "ip_no_pmtu_disc",
907 .data = &init_net.ipv4.sysctl_ip_no_pmtu_disc,
908 .maxlen = sizeof(int),
910 .proc_handler = proc_dointvec
913 .procname = "ip_forward_use_pmtu",
914 .data = &init_net.ipv4.sysctl_ip_fwd_use_pmtu,
915 .maxlen = sizeof(int),
917 .proc_handler = proc_dointvec,
920 .procname = "ip_nonlocal_bind",
921 .data = &init_net.ipv4.sysctl_ip_nonlocal_bind,
922 .maxlen = sizeof(int),
924 .proc_handler = proc_dointvec
927 .procname = "fwmark_reflect",
928 .data = &init_net.ipv4.sysctl_fwmark_reflect,
929 .maxlen = sizeof(int),
931 .proc_handler = proc_dointvec,
934 .procname = "tcp_fwmark_accept",
935 .data = &init_net.ipv4.sysctl_tcp_fwmark_accept,
936 .maxlen = sizeof(int),
938 .proc_handler = proc_dointvec,
941 .procname = "tcp_mtu_probing",
942 .data = &init_net.ipv4.sysctl_tcp_mtu_probing,
943 .maxlen = sizeof(int),
945 .proc_handler = proc_dointvec,
948 .procname = "tcp_base_mss",
949 .data = &init_net.ipv4.sysctl_tcp_base_mss,
950 .maxlen = sizeof(int),
952 .proc_handler = proc_dointvec,
955 .procname = "tcp_probe_threshold",
956 .data = &init_net.ipv4.sysctl_tcp_probe_threshold,
957 .maxlen = sizeof(int),
959 .proc_handler = proc_dointvec,
962 .procname = "tcp_probe_interval",
963 .data = &init_net.ipv4.sysctl_tcp_probe_interval,
964 .maxlen = sizeof(int),
966 .proc_handler = proc_dointvec,
969 .procname = "igmp_link_local_mcast_reports",
970 .data = &sysctl_igmp_llm_reports,
971 .maxlen = sizeof(int),
973 .proc_handler = proc_dointvec
978 static __net_init int ipv4_sysctl_init_net(struct net *net)
980 struct ctl_table *table;
982 table = ipv4_net_table;
983 if (!net_eq(net, &init_net)) {
986 table = kmemdup(table, sizeof(ipv4_net_table), GFP_KERNEL);
990 /* Update the variables to point into the current struct net */
991 for (i = 0; i < ARRAY_SIZE(ipv4_net_table) - 1; i++)
992 table[i].data += (void *)net - (void *)&init_net;
995 net->ipv4.ipv4_hdr = register_net_sysctl(net, "net/ipv4", table);
996 if (!net->ipv4.ipv4_hdr)
999 net->ipv4.sysctl_local_reserved_ports = kzalloc(65536 / 8, GFP_KERNEL);
1000 if (!net->ipv4.sysctl_local_reserved_ports)
1006 unregister_net_sysctl_table(net->ipv4.ipv4_hdr);
1008 if (!net_eq(net, &init_net))
1014 static __net_exit void ipv4_sysctl_exit_net(struct net *net)
1016 struct ctl_table *table;
1018 kfree(net->ipv4.sysctl_local_reserved_ports);
1019 table = net->ipv4.ipv4_hdr->ctl_table_arg;
1020 unregister_net_sysctl_table(net->ipv4.ipv4_hdr);
1024 static __net_initdata struct pernet_operations ipv4_sysctl_ops = {
1025 .init = ipv4_sysctl_init_net,
1026 .exit = ipv4_sysctl_exit_net,
1029 static __init int sysctl_ipv4_init(void)
1031 struct ctl_table_header *hdr;
1033 hdr = register_net_sysctl(&init_net, "net/ipv4", ipv4_table);
1037 if (register_pernet_subsys(&ipv4_sysctl_ops)) {
1038 unregister_net_sysctl_table(hdr);
1045 __initcall(sysctl_ipv4_init);