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 gso_max_segs = GSO_MAX_SEGS;
33 static int tcp_retr1_max = 255;
34 static int ip_local_port_range_min[] = { 1, 1 };
35 static int ip_local_port_range_max[] = { 65535, 65535 };
36 static int tcp_adv_win_scale_min = -31;
37 static int tcp_adv_win_scale_max = 31;
38 static int ip_ttl_min = 1;
39 static int ip_ttl_max = 255;
40 static int tcp_syn_retries_min = 1;
41 static int tcp_syn_retries_max = MAX_TCP_SYNCNT;
42 static int ip_ping_group_range_min[] = { 0, 0 };
43 static int ip_ping_group_range_max[] = { GID_T_MAX, GID_T_MAX };
45 /* Update system visible IP port range */
46 static void set_local_port_range(int range[2])
48 write_seqlock(&sysctl_local_ports.lock);
49 sysctl_local_ports.range[0] = range[0];
50 sysctl_local_ports.range[1] = range[1];
51 write_sequnlock(&sysctl_local_ports.lock);
54 /* Validate changes from /proc interface. */
55 static int ipv4_local_port_range(ctl_table *table, int write,
57 size_t *lenp, loff_t *ppos)
63 .maxlen = sizeof(range),
65 .extra1 = &ip_local_port_range_min,
66 .extra2 = &ip_local_port_range_max,
69 inet_get_local_port_range(range, range + 1);
70 ret = proc_dointvec_minmax(&tmp, write, buffer, lenp, ppos);
72 if (write && ret == 0) {
73 if (range[1] < range[0])
76 set_local_port_range(range);
83 static void inet_get_ping_group_range_table(struct ctl_table *table, kgid_t *low, kgid_t *high)
85 kgid_t *data = table->data;
88 seq = read_seqbegin(&sysctl_local_ports.lock);
92 } while (read_seqretry(&sysctl_local_ports.lock, seq));
95 /* Update system visible IP port range */
96 static void set_ping_group_range(struct ctl_table *table, kgid_t low, kgid_t high)
98 kgid_t *data = table->data;
99 write_seqlock(&sysctl_local_ports.lock);
102 write_sequnlock(&sysctl_local_ports.lock);
105 /* Validate changes from /proc interface. */
106 static int ipv4_ping_group_range(ctl_table *table, int write,
108 size_t *lenp, loff_t *ppos)
110 struct user_namespace *user_ns = current_user_ns();
116 .maxlen = sizeof(urange),
118 .extra1 = &ip_ping_group_range_min,
119 .extra2 = &ip_ping_group_range_max,
122 inet_get_ping_group_range_table(table, &low, &high);
123 urange[0] = from_kgid_munged(user_ns, low);
124 urange[1] = from_kgid_munged(user_ns, high);
125 ret = proc_dointvec_minmax(&tmp, write, buffer, lenp, ppos);
127 if (write && ret == 0) {
128 low = make_kgid(user_ns, urange[0]);
129 high = make_kgid(user_ns, urange[1]);
130 if (!gid_valid(low) || !gid_valid(high) ||
131 (urange[1] < urange[0]) || gid_lt(high, low)) {
132 low = make_kgid(&init_user_ns, 1);
133 high = make_kgid(&init_user_ns, 0);
135 set_ping_group_range(table, low, high);
141 /* Validate changes from /proc interface. */
142 static int proc_tcp_default_init_rwnd(ctl_table *ctl, int write,
144 size_t *lenp, loff_t *ppos)
146 int old_value = *(int *)ctl->data;
147 int ret = proc_dointvec(ctl, write, buffer, lenp, ppos);
148 int new_value = *(int *)ctl->data;
150 if (write && ret == 0 && (new_value < 3 || new_value > 100))
151 *(int *)ctl->data = old_value;
156 static int proc_tcp_congestion_control(ctl_table *ctl, int write,
157 void __user *buffer, size_t *lenp, loff_t *ppos)
159 char val[TCP_CA_NAME_MAX];
162 .maxlen = TCP_CA_NAME_MAX,
166 tcp_get_default_congestion_control(val);
168 ret = proc_dostring(&tbl, write, buffer, lenp, ppos);
169 if (write && ret == 0)
170 ret = tcp_set_default_congestion_control(val);
174 static int proc_tcp_available_congestion_control(ctl_table *ctl,
176 void __user *buffer, size_t *lenp,
179 ctl_table tbl = { .maxlen = TCP_CA_BUF_MAX, };
182 tbl.data = kmalloc(tbl.maxlen, GFP_USER);
185 tcp_get_available_congestion_control(tbl.data, TCP_CA_BUF_MAX);
186 ret = proc_dostring(&tbl, write, buffer, lenp, ppos);
191 static int proc_allowed_congestion_control(ctl_table *ctl,
193 void __user *buffer, size_t *lenp,
196 ctl_table tbl = { .maxlen = TCP_CA_BUF_MAX };
199 tbl.data = kmalloc(tbl.maxlen, GFP_USER);
203 tcp_get_allowed_congestion_control(tbl.data, tbl.maxlen);
204 ret = proc_dostring(&tbl, write, buffer, lenp, ppos);
205 if (write && ret == 0)
206 ret = tcp_set_allowed_congestion_control(tbl.data);
211 static int ipv4_tcp_mem(ctl_table *ctl, int write,
212 void __user *buffer, size_t *lenp,
216 unsigned long vec[3];
217 struct net *net = current->nsproxy->net_ns;
218 #ifdef CONFIG_MEMCG_KMEM
219 struct mem_cgroup *memcg;
224 .maxlen = sizeof(vec),
229 ctl->data = &net->ipv4.sysctl_tcp_mem;
230 return proc_doulongvec_minmax(ctl, write, buffer, lenp, ppos);
233 ret = proc_doulongvec_minmax(&tmp, write, buffer, lenp, ppos);
237 #ifdef CONFIG_MEMCG_KMEM
239 memcg = mem_cgroup_from_task(current);
241 tcp_prot_mem(memcg, vec[0], 0);
242 tcp_prot_mem(memcg, vec[1], 1);
243 tcp_prot_mem(memcg, vec[2], 2);
247 net->ipv4.sysctl_tcp_mem[0] = vec[0];
248 net->ipv4.sysctl_tcp_mem[1] = vec[1];
249 net->ipv4.sysctl_tcp_mem[2] = vec[2];
254 static int proc_tcp_fastopen_key(ctl_table *ctl, int write, void __user *buffer,
255 size_t *lenp, loff_t *ppos)
257 ctl_table tbl = { .maxlen = (TCP_FASTOPEN_KEY_LENGTH * 2 + 10) };
258 struct tcp_fastopen_context *ctxt;
260 u32 user_key[4]; /* 16 bytes, matching TCP_FASTOPEN_KEY_LENGTH */
262 tbl.data = kmalloc(tbl.maxlen, GFP_KERNEL);
267 ctxt = rcu_dereference(tcp_fastopen_ctx);
269 memcpy(user_key, ctxt->key, TCP_FASTOPEN_KEY_LENGTH);
271 memset(user_key, 0, sizeof(user_key));
274 snprintf(tbl.data, tbl.maxlen, "%08x-%08x-%08x-%08x",
275 user_key[0], user_key[1], user_key[2], user_key[3]);
276 ret = proc_dostring(&tbl, write, buffer, lenp, ppos);
278 if (write && ret == 0) {
279 if (sscanf(tbl.data, "%x-%x-%x-%x", user_key, user_key + 1,
280 user_key + 2, user_key + 3) != 4) {
284 tcp_fastopen_reset_cipher(user_key, TCP_FASTOPEN_KEY_LENGTH);
288 pr_debug("proc FO key set 0x%x-%x-%x-%x <- 0x%s: %u\n",
289 user_key[0], user_key[1], user_key[2], user_key[3],
290 (char *)tbl.data, ret);
295 static struct ctl_table ipv4_table[] = {
297 .procname = "tcp_timestamps",
298 .data = &sysctl_tcp_timestamps,
299 .maxlen = sizeof(int),
301 .proc_handler = proc_dointvec
304 .procname = "tcp_window_scaling",
305 .data = &sysctl_tcp_window_scaling,
306 .maxlen = sizeof(int),
308 .proc_handler = proc_dointvec
311 .procname = "tcp_sack",
312 .data = &sysctl_tcp_sack,
313 .maxlen = sizeof(int),
315 .proc_handler = proc_dointvec
318 .procname = "tcp_retrans_collapse",
319 .data = &sysctl_tcp_retrans_collapse,
320 .maxlen = sizeof(int),
322 .proc_handler = proc_dointvec
325 .procname = "ip_default_ttl",
326 .data = &sysctl_ip_default_ttl,
327 .maxlen = sizeof(int),
329 .proc_handler = proc_dointvec_minmax,
330 .extra1 = &ip_ttl_min,
331 .extra2 = &ip_ttl_max,
334 .procname = "ip_no_pmtu_disc",
335 .data = &ipv4_config.no_pmtu_disc,
336 .maxlen = sizeof(int),
338 .proc_handler = proc_dointvec
341 .procname = "ip_nonlocal_bind",
342 .data = &sysctl_ip_nonlocal_bind,
343 .maxlen = sizeof(int),
345 .proc_handler = proc_dointvec
348 .procname = "tcp_syn_retries",
349 .data = &sysctl_tcp_syn_retries,
350 .maxlen = sizeof(int),
352 .proc_handler = proc_dointvec_minmax,
353 .extra1 = &tcp_syn_retries_min,
354 .extra2 = &tcp_syn_retries_max
357 .procname = "tcp_synack_retries",
358 .data = &sysctl_tcp_synack_retries,
359 .maxlen = sizeof(int),
361 .proc_handler = proc_dointvec
364 .procname = "tcp_max_orphans",
365 .data = &sysctl_tcp_max_orphans,
366 .maxlen = sizeof(int),
368 .proc_handler = proc_dointvec
371 .procname = "tcp_max_tw_buckets",
372 .data = &tcp_death_row.sysctl_max_tw_buckets,
373 .maxlen = sizeof(int),
375 .proc_handler = proc_dointvec
378 .procname = "ip_early_demux",
379 .data = &sysctl_ip_early_demux,
380 .maxlen = sizeof(int),
382 .proc_handler = proc_dointvec
385 .procname = "ip_dynaddr",
386 .data = &sysctl_ip_dynaddr,
387 .maxlen = sizeof(int),
389 .proc_handler = proc_dointvec
392 .procname = "tcp_keepalive_time",
393 .data = &sysctl_tcp_keepalive_time,
394 .maxlen = sizeof(int),
396 .proc_handler = proc_dointvec_jiffies,
399 .procname = "tcp_keepalive_probes",
400 .data = &sysctl_tcp_keepalive_probes,
401 .maxlen = sizeof(int),
403 .proc_handler = proc_dointvec
406 .procname = "tcp_keepalive_intvl",
407 .data = &sysctl_tcp_keepalive_intvl,
408 .maxlen = sizeof(int),
410 .proc_handler = proc_dointvec_jiffies,
413 .procname = "tcp_retries1",
414 .data = &sysctl_tcp_retries1,
415 .maxlen = sizeof(int),
417 .proc_handler = proc_dointvec_minmax,
418 .extra2 = &tcp_retr1_max
421 .procname = "tcp_retries2",
422 .data = &sysctl_tcp_retries2,
423 .maxlen = sizeof(int),
425 .proc_handler = proc_dointvec
428 .procname = "tcp_fin_timeout",
429 .data = &sysctl_tcp_fin_timeout,
430 .maxlen = sizeof(int),
432 .proc_handler = proc_dointvec_jiffies,
434 #ifdef CONFIG_SYN_COOKIES
436 .procname = "tcp_syncookies",
437 .data = &sysctl_tcp_syncookies,
438 .maxlen = sizeof(int),
440 .proc_handler = proc_dointvec
444 .procname = "tcp_fastopen",
445 .data = &sysctl_tcp_fastopen,
446 .maxlen = sizeof(int),
448 .proc_handler = proc_dointvec,
451 .procname = "tcp_fastopen_key",
453 .maxlen = ((TCP_FASTOPEN_KEY_LENGTH * 2) + 10),
454 .proc_handler = proc_tcp_fastopen_key,
457 .procname = "tcp_tw_recycle",
458 .data = &tcp_death_row.sysctl_tw_recycle,
459 .maxlen = sizeof(int),
461 .proc_handler = proc_dointvec
464 .procname = "tcp_abort_on_overflow",
465 .data = &sysctl_tcp_abort_on_overflow,
466 .maxlen = sizeof(int),
468 .proc_handler = proc_dointvec
471 .procname = "tcp_stdurg",
472 .data = &sysctl_tcp_stdurg,
473 .maxlen = sizeof(int),
475 .proc_handler = proc_dointvec
478 .procname = "tcp_rfc1337",
479 .data = &sysctl_tcp_rfc1337,
480 .maxlen = sizeof(int),
482 .proc_handler = proc_dointvec
485 .procname = "tcp_max_syn_backlog",
486 .data = &sysctl_max_syn_backlog,
487 .maxlen = sizeof(int),
489 .proc_handler = proc_dointvec
492 .procname = "ip_local_port_range",
493 .data = &sysctl_local_ports.range,
494 .maxlen = sizeof(sysctl_local_ports.range),
496 .proc_handler = ipv4_local_port_range,
499 .procname = "ip_local_reserved_ports",
500 .data = NULL, /* initialized in sysctl_ipv4_init */
503 .proc_handler = proc_do_large_bitmap,
506 .procname = "igmp_max_memberships",
507 .data = &sysctl_igmp_max_memberships,
508 .maxlen = sizeof(int),
510 .proc_handler = proc_dointvec
513 .procname = "igmp_max_msf",
514 .data = &sysctl_igmp_max_msf,
515 .maxlen = sizeof(int),
517 .proc_handler = proc_dointvec
520 .procname = "inet_peer_threshold",
521 .data = &inet_peer_threshold,
522 .maxlen = sizeof(int),
524 .proc_handler = proc_dointvec
527 .procname = "inet_peer_minttl",
528 .data = &inet_peer_minttl,
529 .maxlen = sizeof(int),
531 .proc_handler = proc_dointvec_jiffies,
534 .procname = "inet_peer_maxttl",
535 .data = &inet_peer_maxttl,
536 .maxlen = sizeof(int),
538 .proc_handler = proc_dointvec_jiffies,
541 .procname = "tcp_orphan_retries",
542 .data = &sysctl_tcp_orphan_retries,
543 .maxlen = sizeof(int),
545 .proc_handler = proc_dointvec
548 .procname = "tcp_fack",
549 .data = &sysctl_tcp_fack,
550 .maxlen = sizeof(int),
552 .proc_handler = proc_dointvec
555 .procname = "tcp_reordering",
556 .data = &sysctl_tcp_reordering,
557 .maxlen = sizeof(int),
559 .proc_handler = proc_dointvec
562 .procname = "tcp_dsack",
563 .data = &sysctl_tcp_dsack,
564 .maxlen = sizeof(int),
566 .proc_handler = proc_dointvec
569 .procname = "tcp_wmem",
570 .data = &sysctl_tcp_wmem,
571 .maxlen = sizeof(sysctl_tcp_wmem),
573 .proc_handler = proc_dointvec_minmax,
577 .procname = "tcp_rmem",
578 .data = &sysctl_tcp_rmem,
579 .maxlen = sizeof(sysctl_tcp_rmem),
581 .proc_handler = proc_dointvec_minmax,
585 .procname = "tcp_app_win",
586 .data = &sysctl_tcp_app_win,
587 .maxlen = sizeof(int),
589 .proc_handler = proc_dointvec
592 .procname = "tcp_adv_win_scale",
593 .data = &sysctl_tcp_adv_win_scale,
594 .maxlen = sizeof(int),
596 .proc_handler = proc_dointvec_minmax,
597 .extra1 = &tcp_adv_win_scale_min,
598 .extra2 = &tcp_adv_win_scale_max,
601 .procname = "tcp_tw_reuse",
602 .data = &sysctl_tcp_tw_reuse,
603 .maxlen = sizeof(int),
605 .proc_handler = proc_dointvec
608 .procname = "tcp_frto",
609 .data = &sysctl_tcp_frto,
610 .maxlen = sizeof(int),
612 .proc_handler = proc_dointvec
615 .procname = "tcp_low_latency",
616 .data = &sysctl_tcp_low_latency,
617 .maxlen = sizeof(int),
619 .proc_handler = proc_dointvec
622 .procname = "tcp_no_metrics_save",
623 .data = &sysctl_tcp_nometrics_save,
624 .maxlen = sizeof(int),
626 .proc_handler = proc_dointvec,
629 .procname = "tcp_moderate_rcvbuf",
630 .data = &sysctl_tcp_moderate_rcvbuf,
631 .maxlen = sizeof(int),
633 .proc_handler = proc_dointvec,
636 .procname = "tcp_tso_win_divisor",
637 .data = &sysctl_tcp_tso_win_divisor,
638 .maxlen = sizeof(int),
640 .proc_handler = proc_dointvec,
643 .procname = "tcp_congestion_control",
645 .maxlen = TCP_CA_NAME_MAX,
646 .proc_handler = proc_tcp_congestion_control,
649 .procname = "tcp_mtu_probing",
650 .data = &sysctl_tcp_mtu_probing,
651 .maxlen = sizeof(int),
653 .proc_handler = proc_dointvec,
656 .procname = "tcp_base_mss",
657 .data = &sysctl_tcp_base_mss,
658 .maxlen = sizeof(int),
660 .proc_handler = proc_dointvec,
663 .procname = "tcp_workaround_signed_windows",
664 .data = &sysctl_tcp_workaround_signed_windows,
665 .maxlen = sizeof(int),
667 .proc_handler = proc_dointvec
670 .procname = "tcp_limit_output_bytes",
671 .data = &sysctl_tcp_limit_output_bytes,
672 .maxlen = sizeof(int),
674 .proc_handler = proc_dointvec
677 .procname = "tcp_challenge_ack_limit",
678 .data = &sysctl_tcp_challenge_ack_limit,
679 .maxlen = sizeof(int),
681 .proc_handler = proc_dointvec
683 #ifdef CONFIG_NET_DMA
685 .procname = "tcp_dma_copybreak",
686 .data = &sysctl_tcp_dma_copybreak,
687 .maxlen = sizeof(int),
689 .proc_handler = proc_dointvec
693 .procname = "tcp_slow_start_after_idle",
694 .data = &sysctl_tcp_slow_start_after_idle,
695 .maxlen = sizeof(int),
697 .proc_handler = proc_dointvec
699 #ifdef CONFIG_NETLABEL
701 .procname = "cipso_cache_enable",
702 .data = &cipso_v4_cache_enabled,
703 .maxlen = sizeof(int),
705 .proc_handler = proc_dointvec,
708 .procname = "cipso_cache_bucket_size",
709 .data = &cipso_v4_cache_bucketsize,
710 .maxlen = sizeof(int),
712 .proc_handler = proc_dointvec,
715 .procname = "cipso_rbm_optfmt",
716 .data = &cipso_v4_rbm_optfmt,
717 .maxlen = sizeof(int),
719 .proc_handler = proc_dointvec,
722 .procname = "cipso_rbm_strictvalid",
723 .data = &cipso_v4_rbm_strictvalid,
724 .maxlen = sizeof(int),
726 .proc_handler = proc_dointvec,
728 #endif /* CONFIG_NETLABEL */
730 .procname = "tcp_available_congestion_control",
731 .maxlen = TCP_CA_BUF_MAX,
733 .proc_handler = proc_tcp_available_congestion_control,
736 .procname = "tcp_allowed_congestion_control",
737 .maxlen = TCP_CA_BUF_MAX,
739 .proc_handler = proc_allowed_congestion_control,
742 .procname = "tcp_max_ssthresh",
743 .data = &sysctl_tcp_max_ssthresh,
744 .maxlen = sizeof(int),
746 .proc_handler = proc_dointvec,
749 .procname = "tcp_thin_linear_timeouts",
750 .data = &sysctl_tcp_thin_linear_timeouts,
751 .maxlen = sizeof(int),
753 .proc_handler = proc_dointvec
756 .procname = "tcp_thin_dupack",
757 .data = &sysctl_tcp_thin_dupack,
758 .maxlen = sizeof(int),
760 .proc_handler = proc_dointvec
763 .procname = "tcp_early_retrans",
764 .data = &sysctl_tcp_early_retrans,
765 .maxlen = sizeof(int),
767 .proc_handler = proc_dointvec_minmax,
772 .procname = "tcp_min_tso_segs",
773 .data = &sysctl_tcp_min_tso_segs,
774 .maxlen = sizeof(int),
776 .proc_handler = proc_dointvec_minmax,
778 .extra2 = &gso_max_segs,
781 .procname = "tcp_default_init_rwnd",
782 .data = &sysctl_tcp_default_init_rwnd,
783 .maxlen = sizeof(int),
785 .proc_handler = proc_tcp_default_init_rwnd
788 .procname = "udp_mem",
789 .data = &sysctl_udp_mem,
790 .maxlen = sizeof(sysctl_udp_mem),
792 .proc_handler = proc_doulongvec_minmax,
795 .procname = "udp_rmem_min",
796 .data = &sysctl_udp_rmem_min,
797 .maxlen = sizeof(sysctl_udp_rmem_min),
799 .proc_handler = proc_dointvec_minmax,
803 .procname = "udp_wmem_min",
804 .data = &sysctl_udp_wmem_min,
805 .maxlen = sizeof(sysctl_udp_wmem_min),
807 .proc_handler = proc_dointvec_minmax,
813 static struct ctl_table ipv4_net_table[] = {
815 .procname = "icmp_echo_ignore_all",
816 .data = &init_net.ipv4.sysctl_icmp_echo_ignore_all,
817 .maxlen = sizeof(int),
819 .proc_handler = proc_dointvec
822 .procname = "icmp_echo_ignore_broadcasts",
823 .data = &init_net.ipv4.sysctl_icmp_echo_ignore_broadcasts,
824 .maxlen = sizeof(int),
826 .proc_handler = proc_dointvec
829 .procname = "icmp_ignore_bogus_error_responses",
830 .data = &init_net.ipv4.sysctl_icmp_ignore_bogus_error_responses,
831 .maxlen = sizeof(int),
833 .proc_handler = proc_dointvec
836 .procname = "icmp_errors_use_inbound_ifaddr",
837 .data = &init_net.ipv4.sysctl_icmp_errors_use_inbound_ifaddr,
838 .maxlen = sizeof(int),
840 .proc_handler = proc_dointvec
843 .procname = "icmp_ratelimit",
844 .data = &init_net.ipv4.sysctl_icmp_ratelimit,
845 .maxlen = sizeof(int),
847 .proc_handler = proc_dointvec_ms_jiffies,
850 .procname = "icmp_ratemask",
851 .data = &init_net.ipv4.sysctl_icmp_ratemask,
852 .maxlen = sizeof(int),
854 .proc_handler = proc_dointvec
857 .procname = "ping_group_range",
858 .data = &init_net.ipv4.sysctl_ping_group_range,
859 .maxlen = sizeof(gid_t)*2,
861 .proc_handler = ipv4_ping_group_range,
864 .procname = "tcp_ecn",
865 .data = &init_net.ipv4.sysctl_tcp_ecn,
866 .maxlen = sizeof(int),
868 .proc_handler = proc_dointvec
871 .procname = "tcp_mem",
872 .maxlen = sizeof(init_net.ipv4.sysctl_tcp_mem),
874 .proc_handler = ipv4_tcp_mem,
879 static __net_init int ipv4_sysctl_init_net(struct net *net)
881 struct ctl_table *table;
883 table = ipv4_net_table;
884 if (!net_eq(net, &init_net)) {
885 table = kmemdup(table, sizeof(ipv4_net_table), GFP_KERNEL);
890 &net->ipv4.sysctl_icmp_echo_ignore_all;
892 &net->ipv4.sysctl_icmp_echo_ignore_broadcasts;
894 &net->ipv4.sysctl_icmp_ignore_bogus_error_responses;
896 &net->ipv4.sysctl_icmp_errors_use_inbound_ifaddr;
898 &net->ipv4.sysctl_icmp_ratelimit;
900 &net->ipv4.sysctl_icmp_ratemask;
902 &net->ipv4.sysctl_ping_group_range;
904 &net->ipv4.sysctl_tcp_ecn;
906 /* Don't export sysctls to unprivileged users */
907 if (net->user_ns != &init_user_ns)
908 table[0].procname = NULL;
912 * Sane defaults - nobody may create ping sockets.
913 * Boot scripts should set this to distro-specific group.
915 net->ipv4.sysctl_ping_group_range[0] = make_kgid(&init_user_ns, 1);
916 net->ipv4.sysctl_ping_group_range[1] = make_kgid(&init_user_ns, 0);
920 net->ipv4.ipv4_hdr = register_net_sysctl(net, "net/ipv4", table);
921 if (net->ipv4.ipv4_hdr == NULL)
927 if (!net_eq(net, &init_net))
933 static __net_exit void ipv4_sysctl_exit_net(struct net *net)
935 struct ctl_table *table;
937 table = net->ipv4.ipv4_hdr->ctl_table_arg;
938 unregister_net_sysctl_table(net->ipv4.ipv4_hdr);
942 static __net_initdata struct pernet_operations ipv4_sysctl_ops = {
943 .init = ipv4_sysctl_init_net,
944 .exit = ipv4_sysctl_exit_net,
947 static __init int sysctl_ipv4_init(void)
949 struct ctl_table_header *hdr;
952 for (i = ipv4_table; i->procname; i++) {
953 if (strcmp(i->procname, "ip_local_reserved_ports") == 0) {
954 i->data = sysctl_local_reserved_ports;
961 hdr = register_net_sysctl(&init_net, "net/ipv4", ipv4_table);
965 if (register_pernet_subsys(&ipv4_sysctl_ops)) {
966 unregister_net_sysctl_table(hdr);
973 __initcall(sysctl_ipv4_init);