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>
31 static int tcp_retr1_max = 255;
32 static int ip_local_port_range_min[] = { 1, 1 };
33 static int ip_local_port_range_max[] = { 65535, 65535 };
34 static int tcp_adv_win_scale_min = -31;
35 static int tcp_adv_win_scale_max = 31;
36 static int ip_ttl_min = 1;
37 static int ip_ttl_max = 255;
38 static int ip_ping_group_range_min[] = { 0, 0 };
39 static int ip_ping_group_range_max[] = { GID_T_MAX, GID_T_MAX };
41 /* Update system visible IP port range */
42 static void set_local_port_range(int range[2])
44 write_seqlock(&sysctl_local_ports.lock);
45 sysctl_local_ports.range[0] = range[0];
46 sysctl_local_ports.range[1] = range[1];
47 write_sequnlock(&sysctl_local_ports.lock);
50 /* Validate changes from /proc interface. */
51 static int ipv4_local_port_range(ctl_table *table, int write,
53 size_t *lenp, loff_t *ppos)
59 .maxlen = sizeof(range),
61 .extra1 = &ip_local_port_range_min,
62 .extra2 = &ip_local_port_range_max,
65 inet_get_local_port_range(range, range + 1);
66 ret = proc_dointvec_minmax(&tmp, write, buffer, lenp, ppos);
68 if (write && ret == 0) {
69 if (range[1] < range[0])
72 set_local_port_range(range);
79 static void inet_get_ping_group_range_table(struct ctl_table *table, kgid_t *low, kgid_t *high)
81 kgid_t *data = table->data;
84 seq = read_seqbegin(&sysctl_local_ports.lock);
88 } while (read_seqretry(&sysctl_local_ports.lock, seq));
91 /* Update system visible IP port range */
92 static void set_ping_group_range(struct ctl_table *table, kgid_t low, kgid_t high)
94 kgid_t *data = table->data;
95 write_seqlock(&sysctl_local_ports.lock);
98 write_sequnlock(&sysctl_local_ports.lock);
101 /* Validate changes from /proc interface. */
102 static int ipv4_ping_group_range(ctl_table *table, int write,
104 size_t *lenp, loff_t *ppos)
106 struct user_namespace *user_ns = current_user_ns();
112 .maxlen = sizeof(urange),
114 .extra1 = &ip_ping_group_range_min,
115 .extra2 = &ip_ping_group_range_max,
118 inet_get_ping_group_range_table(table, &low, &high);
119 urange[0] = from_kgid_munged(user_ns, low);
120 urange[1] = from_kgid_munged(user_ns, high);
121 ret = proc_dointvec_minmax(&tmp, write, buffer, lenp, ppos);
123 if (write && ret == 0) {
124 low = make_kgid(user_ns, urange[0]);
125 high = make_kgid(user_ns, urange[1]);
126 if (!gid_valid(low) || !gid_valid(high) ||
127 (urange[1] < urange[0]) || gid_lt(high, low)) {
128 low = make_kgid(&init_user_ns, 1);
129 high = make_kgid(&init_user_ns, 0);
131 set_ping_group_range(table, low, high);
137 static int proc_tcp_congestion_control(ctl_table *ctl, int write,
138 void __user *buffer, size_t *lenp, loff_t *ppos)
140 char val[TCP_CA_NAME_MAX];
143 .maxlen = TCP_CA_NAME_MAX,
147 tcp_get_default_congestion_control(val);
149 ret = proc_dostring(&tbl, write, buffer, lenp, ppos);
150 if (write && ret == 0)
151 ret = tcp_set_default_congestion_control(val);
155 static int proc_tcp_available_congestion_control(ctl_table *ctl,
157 void __user *buffer, size_t *lenp,
160 ctl_table tbl = { .maxlen = TCP_CA_BUF_MAX, };
163 tbl.data = kmalloc(tbl.maxlen, GFP_USER);
166 tcp_get_available_congestion_control(tbl.data, TCP_CA_BUF_MAX);
167 ret = proc_dostring(&tbl, write, buffer, lenp, ppos);
172 static int proc_allowed_congestion_control(ctl_table *ctl,
174 void __user *buffer, size_t *lenp,
177 ctl_table tbl = { .maxlen = TCP_CA_BUF_MAX };
180 tbl.data = kmalloc(tbl.maxlen, GFP_USER);
184 tcp_get_allowed_congestion_control(tbl.data, tbl.maxlen);
185 ret = proc_dostring(&tbl, write, buffer, lenp, ppos);
186 if (write && ret == 0)
187 ret = tcp_set_allowed_congestion_control(tbl.data);
192 static int ipv4_tcp_mem(ctl_table *ctl, int write,
193 void __user *buffer, size_t *lenp,
197 unsigned long vec[3];
198 struct net *net = current->nsproxy->net_ns;
199 #ifdef CONFIG_MEMCG_KMEM
200 struct mem_cgroup *memcg;
205 .maxlen = sizeof(vec),
210 ctl->data = &net->ipv4.sysctl_tcp_mem;
211 return proc_doulongvec_minmax(ctl, write, buffer, lenp, ppos);
214 ret = proc_doulongvec_minmax(&tmp, write, buffer, lenp, ppos);
218 #ifdef CONFIG_MEMCG_KMEM
220 memcg = mem_cgroup_from_task(current);
222 tcp_prot_mem(memcg, vec[0], 0);
223 tcp_prot_mem(memcg, vec[1], 1);
224 tcp_prot_mem(memcg, vec[2], 2);
228 net->ipv4.sysctl_tcp_mem[0] = vec[0];
229 net->ipv4.sysctl_tcp_mem[1] = vec[1];
230 net->ipv4.sysctl_tcp_mem[2] = vec[2];
235 int proc_tcp_fastopen_key(ctl_table *ctl, int write, void __user *buffer,
236 size_t *lenp, loff_t *ppos)
238 ctl_table tbl = { .maxlen = (TCP_FASTOPEN_KEY_LENGTH * 2 + 10) };
239 struct tcp_fastopen_context *ctxt;
241 u32 user_key[4]; /* 16 bytes, matching TCP_FASTOPEN_KEY_LENGTH */
243 tbl.data = kmalloc(tbl.maxlen, GFP_KERNEL);
248 ctxt = rcu_dereference(tcp_fastopen_ctx);
250 memcpy(user_key, ctxt->key, TCP_FASTOPEN_KEY_LENGTH);
253 snprintf(tbl.data, tbl.maxlen, "%08x-%08x-%08x-%08x",
254 user_key[0], user_key[1], user_key[2], user_key[3]);
255 ret = proc_dostring(&tbl, write, buffer, lenp, ppos);
257 if (write && ret == 0) {
258 if (sscanf(tbl.data, "%x-%x-%x-%x", user_key, user_key + 1,
259 user_key + 2, user_key + 3) != 4) {
263 tcp_fastopen_reset_cipher(user_key, TCP_FASTOPEN_KEY_LENGTH);
267 pr_debug("proc FO key set 0x%x-%x-%x-%x <- 0x%s: %u\n",
268 user_key[0], user_key[1], user_key[2], user_key[3],
269 (char *)tbl.data, ret);
274 static struct ctl_table ipv4_table[] = {
276 .procname = "tcp_timestamps",
277 .data = &sysctl_tcp_timestamps,
278 .maxlen = sizeof(int),
280 .proc_handler = proc_dointvec
283 .procname = "tcp_window_scaling",
284 .data = &sysctl_tcp_window_scaling,
285 .maxlen = sizeof(int),
287 .proc_handler = proc_dointvec
290 .procname = "tcp_sack",
291 .data = &sysctl_tcp_sack,
292 .maxlen = sizeof(int),
294 .proc_handler = proc_dointvec
297 .procname = "tcp_retrans_collapse",
298 .data = &sysctl_tcp_retrans_collapse,
299 .maxlen = sizeof(int),
301 .proc_handler = proc_dointvec
304 .procname = "ip_default_ttl",
305 .data = &sysctl_ip_default_ttl,
306 .maxlen = sizeof(int),
308 .proc_handler = proc_dointvec_minmax,
309 .extra1 = &ip_ttl_min,
310 .extra2 = &ip_ttl_max,
313 .procname = "ip_no_pmtu_disc",
314 .data = &ipv4_config.no_pmtu_disc,
315 .maxlen = sizeof(int),
317 .proc_handler = proc_dointvec
320 .procname = "ip_nonlocal_bind",
321 .data = &sysctl_ip_nonlocal_bind,
322 .maxlen = sizeof(int),
324 .proc_handler = proc_dointvec
327 .procname = "tcp_syn_retries",
328 .data = &sysctl_tcp_syn_retries,
329 .maxlen = sizeof(int),
331 .proc_handler = proc_dointvec
334 .procname = "tcp_synack_retries",
335 .data = &sysctl_tcp_synack_retries,
336 .maxlen = sizeof(int),
338 .proc_handler = proc_dointvec
341 .procname = "tcp_max_orphans",
342 .data = &sysctl_tcp_max_orphans,
343 .maxlen = sizeof(int),
345 .proc_handler = proc_dointvec
348 .procname = "tcp_max_tw_buckets",
349 .data = &tcp_death_row.sysctl_max_tw_buckets,
350 .maxlen = sizeof(int),
352 .proc_handler = proc_dointvec
355 .procname = "ip_early_demux",
356 .data = &sysctl_ip_early_demux,
357 .maxlen = sizeof(int),
359 .proc_handler = proc_dointvec
362 .procname = "ip_dynaddr",
363 .data = &sysctl_ip_dynaddr,
364 .maxlen = sizeof(int),
366 .proc_handler = proc_dointvec
369 .procname = "tcp_keepalive_time",
370 .data = &sysctl_tcp_keepalive_time,
371 .maxlen = sizeof(int),
373 .proc_handler = proc_dointvec_jiffies,
376 .procname = "tcp_keepalive_probes",
377 .data = &sysctl_tcp_keepalive_probes,
378 .maxlen = sizeof(int),
380 .proc_handler = proc_dointvec
383 .procname = "tcp_keepalive_intvl",
384 .data = &sysctl_tcp_keepalive_intvl,
385 .maxlen = sizeof(int),
387 .proc_handler = proc_dointvec_jiffies,
390 .procname = "tcp_retries1",
391 .data = &sysctl_tcp_retries1,
392 .maxlen = sizeof(int),
394 .proc_handler = proc_dointvec_minmax,
395 .extra2 = &tcp_retr1_max
398 .procname = "tcp_retries2",
399 .data = &sysctl_tcp_retries2,
400 .maxlen = sizeof(int),
402 .proc_handler = proc_dointvec
405 .procname = "tcp_fin_timeout",
406 .data = &sysctl_tcp_fin_timeout,
407 .maxlen = sizeof(int),
409 .proc_handler = proc_dointvec_jiffies,
411 #ifdef CONFIG_SYN_COOKIES
413 .procname = "tcp_syncookies",
414 .data = &sysctl_tcp_syncookies,
415 .maxlen = sizeof(int),
417 .proc_handler = proc_dointvec
421 .procname = "tcp_fastopen",
422 .data = &sysctl_tcp_fastopen,
423 .maxlen = sizeof(int),
425 .proc_handler = proc_dointvec,
428 .procname = "tcp_fastopen_key",
430 .maxlen = ((TCP_FASTOPEN_KEY_LENGTH * 2) + 10),
431 .proc_handler = proc_tcp_fastopen_key,
434 .procname = "tcp_tw_recycle",
435 .data = &tcp_death_row.sysctl_tw_recycle,
436 .maxlen = sizeof(int),
438 .proc_handler = proc_dointvec
441 .procname = "tcp_abort_on_overflow",
442 .data = &sysctl_tcp_abort_on_overflow,
443 .maxlen = sizeof(int),
445 .proc_handler = proc_dointvec
448 .procname = "tcp_stdurg",
449 .data = &sysctl_tcp_stdurg,
450 .maxlen = sizeof(int),
452 .proc_handler = proc_dointvec
455 .procname = "tcp_rfc1337",
456 .data = &sysctl_tcp_rfc1337,
457 .maxlen = sizeof(int),
459 .proc_handler = proc_dointvec
462 .procname = "tcp_max_syn_backlog",
463 .data = &sysctl_max_syn_backlog,
464 .maxlen = sizeof(int),
466 .proc_handler = proc_dointvec
469 .procname = "ip_local_port_range",
470 .data = &sysctl_local_ports.range,
471 .maxlen = sizeof(sysctl_local_ports.range),
473 .proc_handler = ipv4_local_port_range,
476 .procname = "ip_local_reserved_ports",
477 .data = NULL, /* initialized in sysctl_ipv4_init */
480 .proc_handler = proc_do_large_bitmap,
483 .procname = "igmp_max_memberships",
484 .data = &sysctl_igmp_max_memberships,
485 .maxlen = sizeof(int),
487 .proc_handler = proc_dointvec
490 .procname = "igmp_max_msf",
491 .data = &sysctl_igmp_max_msf,
492 .maxlen = sizeof(int),
494 .proc_handler = proc_dointvec
497 .procname = "inet_peer_threshold",
498 .data = &inet_peer_threshold,
499 .maxlen = sizeof(int),
501 .proc_handler = proc_dointvec
504 .procname = "inet_peer_minttl",
505 .data = &inet_peer_minttl,
506 .maxlen = sizeof(int),
508 .proc_handler = proc_dointvec_jiffies,
511 .procname = "inet_peer_maxttl",
512 .data = &inet_peer_maxttl,
513 .maxlen = sizeof(int),
515 .proc_handler = proc_dointvec_jiffies,
518 .procname = "tcp_orphan_retries",
519 .data = &sysctl_tcp_orphan_retries,
520 .maxlen = sizeof(int),
522 .proc_handler = proc_dointvec
525 .procname = "tcp_fack",
526 .data = &sysctl_tcp_fack,
527 .maxlen = sizeof(int),
529 .proc_handler = proc_dointvec
532 .procname = "tcp_reordering",
533 .data = &sysctl_tcp_reordering,
534 .maxlen = sizeof(int),
536 .proc_handler = proc_dointvec
539 .procname = "tcp_ecn",
540 .data = &sysctl_tcp_ecn,
541 .maxlen = sizeof(int),
543 .proc_handler = proc_dointvec
546 .procname = "tcp_dsack",
547 .data = &sysctl_tcp_dsack,
548 .maxlen = sizeof(int),
550 .proc_handler = proc_dointvec
553 .procname = "tcp_wmem",
554 .data = &sysctl_tcp_wmem,
555 .maxlen = sizeof(sysctl_tcp_wmem),
557 .proc_handler = proc_dointvec
560 .procname = "tcp_rmem",
561 .data = &sysctl_tcp_rmem,
562 .maxlen = sizeof(sysctl_tcp_rmem),
564 .proc_handler = proc_dointvec
567 .procname = "tcp_app_win",
568 .data = &sysctl_tcp_app_win,
569 .maxlen = sizeof(int),
571 .proc_handler = proc_dointvec
574 .procname = "tcp_adv_win_scale",
575 .data = &sysctl_tcp_adv_win_scale,
576 .maxlen = sizeof(int),
578 .proc_handler = proc_dointvec_minmax,
579 .extra1 = &tcp_adv_win_scale_min,
580 .extra2 = &tcp_adv_win_scale_max,
583 .procname = "tcp_tw_reuse",
584 .data = &sysctl_tcp_tw_reuse,
585 .maxlen = sizeof(int),
587 .proc_handler = proc_dointvec
590 .procname = "tcp_frto",
591 .data = &sysctl_tcp_frto,
592 .maxlen = sizeof(int),
594 .proc_handler = proc_dointvec
597 .procname = "tcp_frto_response",
598 .data = &sysctl_tcp_frto_response,
599 .maxlen = sizeof(int),
601 .proc_handler = proc_dointvec
604 .procname = "tcp_low_latency",
605 .data = &sysctl_tcp_low_latency,
606 .maxlen = sizeof(int),
608 .proc_handler = proc_dointvec
611 .procname = "tcp_no_metrics_save",
612 .data = &sysctl_tcp_nometrics_save,
613 .maxlen = sizeof(int),
615 .proc_handler = proc_dointvec,
618 .procname = "tcp_moderate_rcvbuf",
619 .data = &sysctl_tcp_moderate_rcvbuf,
620 .maxlen = sizeof(int),
622 .proc_handler = proc_dointvec,
625 .procname = "tcp_tso_win_divisor",
626 .data = &sysctl_tcp_tso_win_divisor,
627 .maxlen = sizeof(int),
629 .proc_handler = proc_dointvec,
632 .procname = "tcp_congestion_control",
634 .maxlen = TCP_CA_NAME_MAX,
635 .proc_handler = proc_tcp_congestion_control,
638 .procname = "tcp_abc",
639 .data = &sysctl_tcp_abc,
640 .maxlen = sizeof(int),
642 .proc_handler = proc_dointvec,
645 .procname = "tcp_mtu_probing",
646 .data = &sysctl_tcp_mtu_probing,
647 .maxlen = sizeof(int),
649 .proc_handler = proc_dointvec,
652 .procname = "tcp_base_mss",
653 .data = &sysctl_tcp_base_mss,
654 .maxlen = sizeof(int),
656 .proc_handler = proc_dointvec,
659 .procname = "tcp_workaround_signed_windows",
660 .data = &sysctl_tcp_workaround_signed_windows,
661 .maxlen = sizeof(int),
663 .proc_handler = proc_dointvec
666 .procname = "tcp_limit_output_bytes",
667 .data = &sysctl_tcp_limit_output_bytes,
668 .maxlen = sizeof(int),
670 .proc_handler = proc_dointvec
673 .procname = "tcp_challenge_ack_limit",
674 .data = &sysctl_tcp_challenge_ack_limit,
675 .maxlen = sizeof(int),
677 .proc_handler = proc_dointvec
679 #ifdef CONFIG_NET_DMA
681 .procname = "tcp_dma_copybreak",
682 .data = &sysctl_tcp_dma_copybreak,
683 .maxlen = sizeof(int),
685 .proc_handler = proc_dointvec
689 .procname = "tcp_slow_start_after_idle",
690 .data = &sysctl_tcp_slow_start_after_idle,
691 .maxlen = sizeof(int),
693 .proc_handler = proc_dointvec
695 #ifdef CONFIG_NETLABEL
697 .procname = "cipso_cache_enable",
698 .data = &cipso_v4_cache_enabled,
699 .maxlen = sizeof(int),
701 .proc_handler = proc_dointvec,
704 .procname = "cipso_cache_bucket_size",
705 .data = &cipso_v4_cache_bucketsize,
706 .maxlen = sizeof(int),
708 .proc_handler = proc_dointvec,
711 .procname = "cipso_rbm_optfmt",
712 .data = &cipso_v4_rbm_optfmt,
713 .maxlen = sizeof(int),
715 .proc_handler = proc_dointvec,
718 .procname = "cipso_rbm_strictvalid",
719 .data = &cipso_v4_rbm_strictvalid,
720 .maxlen = sizeof(int),
722 .proc_handler = proc_dointvec,
724 #endif /* CONFIG_NETLABEL */
726 .procname = "tcp_available_congestion_control",
727 .maxlen = TCP_CA_BUF_MAX,
729 .proc_handler = proc_tcp_available_congestion_control,
732 .procname = "tcp_allowed_congestion_control",
733 .maxlen = TCP_CA_BUF_MAX,
735 .proc_handler = proc_allowed_congestion_control,
738 .procname = "tcp_max_ssthresh",
739 .data = &sysctl_tcp_max_ssthresh,
740 .maxlen = sizeof(int),
742 .proc_handler = proc_dointvec,
745 .procname = "tcp_cookie_size",
746 .data = &sysctl_tcp_cookie_size,
747 .maxlen = sizeof(int),
749 .proc_handler = proc_dointvec
752 .procname = "tcp_thin_linear_timeouts",
753 .data = &sysctl_tcp_thin_linear_timeouts,
754 .maxlen = sizeof(int),
756 .proc_handler = proc_dointvec
759 .procname = "tcp_thin_dupack",
760 .data = &sysctl_tcp_thin_dupack,
761 .maxlen = sizeof(int),
763 .proc_handler = proc_dointvec
766 .procname = "tcp_early_retrans",
767 .data = &sysctl_tcp_early_retrans,
768 .maxlen = sizeof(int),
770 .proc_handler = proc_dointvec_minmax,
775 .procname = "udp_mem",
776 .data = &sysctl_udp_mem,
777 .maxlen = sizeof(sysctl_udp_mem),
779 .proc_handler = proc_doulongvec_minmax,
782 .procname = "udp_rmem_min",
783 .data = &sysctl_udp_rmem_min,
784 .maxlen = sizeof(sysctl_udp_rmem_min),
786 .proc_handler = proc_dointvec_minmax,
790 .procname = "udp_wmem_min",
791 .data = &sysctl_udp_wmem_min,
792 .maxlen = sizeof(sysctl_udp_wmem_min),
794 .proc_handler = proc_dointvec_minmax,
800 static struct ctl_table ipv4_net_table[] = {
802 .procname = "icmp_echo_ignore_all",
803 .data = &init_net.ipv4.sysctl_icmp_echo_ignore_all,
804 .maxlen = sizeof(int),
806 .proc_handler = proc_dointvec
809 .procname = "icmp_echo_ignore_broadcasts",
810 .data = &init_net.ipv4.sysctl_icmp_echo_ignore_broadcasts,
811 .maxlen = sizeof(int),
813 .proc_handler = proc_dointvec
816 .procname = "icmp_ignore_bogus_error_responses",
817 .data = &init_net.ipv4.sysctl_icmp_ignore_bogus_error_responses,
818 .maxlen = sizeof(int),
820 .proc_handler = proc_dointvec
823 .procname = "icmp_errors_use_inbound_ifaddr",
824 .data = &init_net.ipv4.sysctl_icmp_errors_use_inbound_ifaddr,
825 .maxlen = sizeof(int),
827 .proc_handler = proc_dointvec
830 .procname = "icmp_ratelimit",
831 .data = &init_net.ipv4.sysctl_icmp_ratelimit,
832 .maxlen = sizeof(int),
834 .proc_handler = proc_dointvec_ms_jiffies,
837 .procname = "icmp_ratemask",
838 .data = &init_net.ipv4.sysctl_icmp_ratemask,
839 .maxlen = sizeof(int),
841 .proc_handler = proc_dointvec
844 .procname = "ping_group_range",
845 .data = &init_net.ipv4.sysctl_ping_group_range,
846 .maxlen = sizeof(gid_t)*2,
848 .proc_handler = ipv4_ping_group_range,
851 .procname = "tcp_mem",
852 .maxlen = sizeof(init_net.ipv4.sysctl_tcp_mem),
854 .proc_handler = ipv4_tcp_mem,
859 static __net_init int ipv4_sysctl_init_net(struct net *net)
861 struct ctl_table *table;
863 table = ipv4_net_table;
864 if (!net_eq(net, &init_net)) {
865 table = kmemdup(table, sizeof(ipv4_net_table), GFP_KERNEL);
870 &net->ipv4.sysctl_icmp_echo_ignore_all;
872 &net->ipv4.sysctl_icmp_echo_ignore_broadcasts;
874 &net->ipv4.sysctl_icmp_ignore_bogus_error_responses;
876 &net->ipv4.sysctl_icmp_errors_use_inbound_ifaddr;
878 &net->ipv4.sysctl_icmp_ratelimit;
880 &net->ipv4.sysctl_icmp_ratemask;
882 &net->ipv4.sysctl_ping_group_range;
887 * Sane defaults - nobody may create ping sockets.
888 * Boot scripts should set this to distro-specific group.
890 net->ipv4.sysctl_ping_group_range[0] = make_kgid(&init_user_ns, 1);
891 net->ipv4.sysctl_ping_group_range[1] = make_kgid(&init_user_ns, 0);
895 net->ipv4.ipv4_hdr = register_net_sysctl(net, "net/ipv4", table);
896 if (net->ipv4.ipv4_hdr == NULL)
902 if (!net_eq(net, &init_net))
908 static __net_exit void ipv4_sysctl_exit_net(struct net *net)
910 struct ctl_table *table;
912 table = net->ipv4.ipv4_hdr->ctl_table_arg;
913 unregister_net_sysctl_table(net->ipv4.ipv4_hdr);
917 static __net_initdata struct pernet_operations ipv4_sysctl_ops = {
918 .init = ipv4_sysctl_init_net,
919 .exit = ipv4_sysctl_exit_net,
922 static __init int sysctl_ipv4_init(void)
924 struct ctl_table_header *hdr;
927 for (i = ipv4_table; i->procname; i++) {
928 if (strcmp(i->procname, "ip_local_reserved_ports") == 0) {
929 i->data = sysctl_local_reserved_ports;
936 hdr = register_net_sysctl(&init_net, "net/ipv4", ipv4_table);
940 if (register_pernet_subsys(&ipv4_sysctl_ops)) {
941 unregister_net_sysctl_table(hdr);
948 __initcall(sysctl_ipv4_init);