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);
252 memset(user_key, 0, sizeof(user_key));
255 snprintf(tbl.data, tbl.maxlen, "%08x-%08x-%08x-%08x",
256 user_key[0], user_key[1], user_key[2], user_key[3]);
257 ret = proc_dostring(&tbl, write, buffer, lenp, ppos);
259 if (write && ret == 0) {
260 if (sscanf(tbl.data, "%x-%x-%x-%x", user_key, user_key + 1,
261 user_key + 2, user_key + 3) != 4) {
265 tcp_fastopen_reset_cipher(user_key, TCP_FASTOPEN_KEY_LENGTH);
269 pr_debug("proc FO key set 0x%x-%x-%x-%x <- 0x%s: %u\n",
270 user_key[0], user_key[1], user_key[2], user_key[3],
271 (char *)tbl.data, ret);
276 static struct ctl_table ipv4_table[] = {
278 .procname = "tcp_timestamps",
279 .data = &sysctl_tcp_timestamps,
280 .maxlen = sizeof(int),
282 .proc_handler = proc_dointvec
285 .procname = "tcp_window_scaling",
286 .data = &sysctl_tcp_window_scaling,
287 .maxlen = sizeof(int),
289 .proc_handler = proc_dointvec
292 .procname = "tcp_sack",
293 .data = &sysctl_tcp_sack,
294 .maxlen = sizeof(int),
296 .proc_handler = proc_dointvec
299 .procname = "tcp_retrans_collapse",
300 .data = &sysctl_tcp_retrans_collapse,
301 .maxlen = sizeof(int),
303 .proc_handler = proc_dointvec
306 .procname = "ip_default_ttl",
307 .data = &sysctl_ip_default_ttl,
308 .maxlen = sizeof(int),
310 .proc_handler = proc_dointvec_minmax,
311 .extra1 = &ip_ttl_min,
312 .extra2 = &ip_ttl_max,
315 .procname = "ip_no_pmtu_disc",
316 .data = &ipv4_config.no_pmtu_disc,
317 .maxlen = sizeof(int),
319 .proc_handler = proc_dointvec
322 .procname = "ip_nonlocal_bind",
323 .data = &sysctl_ip_nonlocal_bind,
324 .maxlen = sizeof(int),
326 .proc_handler = proc_dointvec
329 .procname = "tcp_syn_retries",
330 .data = &sysctl_tcp_syn_retries,
331 .maxlen = sizeof(int),
333 .proc_handler = proc_dointvec
336 .procname = "tcp_synack_retries",
337 .data = &sysctl_tcp_synack_retries,
338 .maxlen = sizeof(int),
340 .proc_handler = proc_dointvec
343 .procname = "tcp_max_orphans",
344 .data = &sysctl_tcp_max_orphans,
345 .maxlen = sizeof(int),
347 .proc_handler = proc_dointvec
350 .procname = "tcp_max_tw_buckets",
351 .data = &tcp_death_row.sysctl_max_tw_buckets,
352 .maxlen = sizeof(int),
354 .proc_handler = proc_dointvec
357 .procname = "ip_early_demux",
358 .data = &sysctl_ip_early_demux,
359 .maxlen = sizeof(int),
361 .proc_handler = proc_dointvec
364 .procname = "ip_dynaddr",
365 .data = &sysctl_ip_dynaddr,
366 .maxlen = sizeof(int),
368 .proc_handler = proc_dointvec
371 .procname = "tcp_keepalive_time",
372 .data = &sysctl_tcp_keepalive_time,
373 .maxlen = sizeof(int),
375 .proc_handler = proc_dointvec_jiffies,
378 .procname = "tcp_keepalive_probes",
379 .data = &sysctl_tcp_keepalive_probes,
380 .maxlen = sizeof(int),
382 .proc_handler = proc_dointvec
385 .procname = "tcp_keepalive_intvl",
386 .data = &sysctl_tcp_keepalive_intvl,
387 .maxlen = sizeof(int),
389 .proc_handler = proc_dointvec_jiffies,
392 .procname = "tcp_retries1",
393 .data = &sysctl_tcp_retries1,
394 .maxlen = sizeof(int),
396 .proc_handler = proc_dointvec_minmax,
397 .extra2 = &tcp_retr1_max
400 .procname = "tcp_retries2",
401 .data = &sysctl_tcp_retries2,
402 .maxlen = sizeof(int),
404 .proc_handler = proc_dointvec
407 .procname = "tcp_fin_timeout",
408 .data = &sysctl_tcp_fin_timeout,
409 .maxlen = sizeof(int),
411 .proc_handler = proc_dointvec_jiffies,
413 #ifdef CONFIG_SYN_COOKIES
415 .procname = "tcp_syncookies",
416 .data = &sysctl_tcp_syncookies,
417 .maxlen = sizeof(int),
419 .proc_handler = proc_dointvec
423 .procname = "tcp_fastopen",
424 .data = &sysctl_tcp_fastopen,
425 .maxlen = sizeof(int),
427 .proc_handler = proc_dointvec,
430 .procname = "tcp_fastopen_key",
432 .maxlen = ((TCP_FASTOPEN_KEY_LENGTH * 2) + 10),
433 .proc_handler = proc_tcp_fastopen_key,
436 .procname = "tcp_tw_recycle",
437 .data = &tcp_death_row.sysctl_tw_recycle,
438 .maxlen = sizeof(int),
440 .proc_handler = proc_dointvec
443 .procname = "tcp_abort_on_overflow",
444 .data = &sysctl_tcp_abort_on_overflow,
445 .maxlen = sizeof(int),
447 .proc_handler = proc_dointvec
450 .procname = "tcp_stdurg",
451 .data = &sysctl_tcp_stdurg,
452 .maxlen = sizeof(int),
454 .proc_handler = proc_dointvec
457 .procname = "tcp_rfc1337",
458 .data = &sysctl_tcp_rfc1337,
459 .maxlen = sizeof(int),
461 .proc_handler = proc_dointvec
464 .procname = "tcp_max_syn_backlog",
465 .data = &sysctl_max_syn_backlog,
466 .maxlen = sizeof(int),
468 .proc_handler = proc_dointvec
471 .procname = "ip_local_port_range",
472 .data = &sysctl_local_ports.range,
473 .maxlen = sizeof(sysctl_local_ports.range),
475 .proc_handler = ipv4_local_port_range,
478 .procname = "ip_local_reserved_ports",
479 .data = NULL, /* initialized in sysctl_ipv4_init */
482 .proc_handler = proc_do_large_bitmap,
485 .procname = "igmp_max_memberships",
486 .data = &sysctl_igmp_max_memberships,
487 .maxlen = sizeof(int),
489 .proc_handler = proc_dointvec
492 .procname = "igmp_max_msf",
493 .data = &sysctl_igmp_max_msf,
494 .maxlen = sizeof(int),
496 .proc_handler = proc_dointvec
499 .procname = "inet_peer_threshold",
500 .data = &inet_peer_threshold,
501 .maxlen = sizeof(int),
503 .proc_handler = proc_dointvec
506 .procname = "inet_peer_minttl",
507 .data = &inet_peer_minttl,
508 .maxlen = sizeof(int),
510 .proc_handler = proc_dointvec_jiffies,
513 .procname = "inet_peer_maxttl",
514 .data = &inet_peer_maxttl,
515 .maxlen = sizeof(int),
517 .proc_handler = proc_dointvec_jiffies,
520 .procname = "tcp_orphan_retries",
521 .data = &sysctl_tcp_orphan_retries,
522 .maxlen = sizeof(int),
524 .proc_handler = proc_dointvec
527 .procname = "tcp_fack",
528 .data = &sysctl_tcp_fack,
529 .maxlen = sizeof(int),
531 .proc_handler = proc_dointvec
534 .procname = "tcp_reordering",
535 .data = &sysctl_tcp_reordering,
536 .maxlen = sizeof(int),
538 .proc_handler = proc_dointvec
541 .procname = "tcp_ecn",
542 .data = &sysctl_tcp_ecn,
543 .maxlen = sizeof(int),
545 .proc_handler = proc_dointvec
548 .procname = "tcp_dsack",
549 .data = &sysctl_tcp_dsack,
550 .maxlen = sizeof(int),
552 .proc_handler = proc_dointvec
555 .procname = "tcp_wmem",
556 .data = &sysctl_tcp_wmem,
557 .maxlen = sizeof(sysctl_tcp_wmem),
559 .proc_handler = proc_dointvec
562 .procname = "tcp_rmem",
563 .data = &sysctl_tcp_rmem,
564 .maxlen = sizeof(sysctl_tcp_rmem),
566 .proc_handler = proc_dointvec
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_frto_response",
600 .data = &sysctl_tcp_frto_response,
601 .maxlen = sizeof(int),
603 .proc_handler = proc_dointvec
606 .procname = "tcp_low_latency",
607 .data = &sysctl_tcp_low_latency,
608 .maxlen = sizeof(int),
610 .proc_handler = proc_dointvec
613 .procname = "tcp_no_metrics_save",
614 .data = &sysctl_tcp_nometrics_save,
615 .maxlen = sizeof(int),
617 .proc_handler = proc_dointvec,
620 .procname = "tcp_moderate_rcvbuf",
621 .data = &sysctl_tcp_moderate_rcvbuf,
622 .maxlen = sizeof(int),
624 .proc_handler = proc_dointvec,
627 .procname = "tcp_tso_win_divisor",
628 .data = &sysctl_tcp_tso_win_divisor,
629 .maxlen = sizeof(int),
631 .proc_handler = proc_dointvec,
634 .procname = "tcp_congestion_control",
636 .maxlen = TCP_CA_NAME_MAX,
637 .proc_handler = proc_tcp_congestion_control,
640 .procname = "tcp_abc",
641 .data = &sysctl_tcp_abc,
642 .maxlen = sizeof(int),
644 .proc_handler = proc_dointvec,
647 .procname = "tcp_mtu_probing",
648 .data = &sysctl_tcp_mtu_probing,
649 .maxlen = sizeof(int),
651 .proc_handler = proc_dointvec,
654 .procname = "tcp_base_mss",
655 .data = &sysctl_tcp_base_mss,
656 .maxlen = sizeof(int),
658 .proc_handler = proc_dointvec,
661 .procname = "tcp_workaround_signed_windows",
662 .data = &sysctl_tcp_workaround_signed_windows,
663 .maxlen = sizeof(int),
665 .proc_handler = proc_dointvec
668 .procname = "tcp_limit_output_bytes",
669 .data = &sysctl_tcp_limit_output_bytes,
670 .maxlen = sizeof(int),
672 .proc_handler = proc_dointvec
675 .procname = "tcp_challenge_ack_limit",
676 .data = &sysctl_tcp_challenge_ack_limit,
677 .maxlen = sizeof(int),
679 .proc_handler = proc_dointvec
681 #ifdef CONFIG_NET_DMA
683 .procname = "tcp_dma_copybreak",
684 .data = &sysctl_tcp_dma_copybreak,
685 .maxlen = sizeof(int),
687 .proc_handler = proc_dointvec
691 .procname = "tcp_slow_start_after_idle",
692 .data = &sysctl_tcp_slow_start_after_idle,
693 .maxlen = sizeof(int),
695 .proc_handler = proc_dointvec
697 #ifdef CONFIG_NETLABEL
699 .procname = "cipso_cache_enable",
700 .data = &cipso_v4_cache_enabled,
701 .maxlen = sizeof(int),
703 .proc_handler = proc_dointvec,
706 .procname = "cipso_cache_bucket_size",
707 .data = &cipso_v4_cache_bucketsize,
708 .maxlen = sizeof(int),
710 .proc_handler = proc_dointvec,
713 .procname = "cipso_rbm_optfmt",
714 .data = &cipso_v4_rbm_optfmt,
715 .maxlen = sizeof(int),
717 .proc_handler = proc_dointvec,
720 .procname = "cipso_rbm_strictvalid",
721 .data = &cipso_v4_rbm_strictvalid,
722 .maxlen = sizeof(int),
724 .proc_handler = proc_dointvec,
726 #endif /* CONFIG_NETLABEL */
728 .procname = "tcp_available_congestion_control",
729 .maxlen = TCP_CA_BUF_MAX,
731 .proc_handler = proc_tcp_available_congestion_control,
734 .procname = "tcp_allowed_congestion_control",
735 .maxlen = TCP_CA_BUF_MAX,
737 .proc_handler = proc_allowed_congestion_control,
740 .procname = "tcp_max_ssthresh",
741 .data = &sysctl_tcp_max_ssthresh,
742 .maxlen = sizeof(int),
744 .proc_handler = proc_dointvec,
747 .procname = "tcp_cookie_size",
748 .data = &sysctl_tcp_cookie_size,
749 .maxlen = sizeof(int),
751 .proc_handler = proc_dointvec
754 .procname = "tcp_thin_linear_timeouts",
755 .data = &sysctl_tcp_thin_linear_timeouts,
756 .maxlen = sizeof(int),
758 .proc_handler = proc_dointvec
761 .procname = "tcp_thin_dupack",
762 .data = &sysctl_tcp_thin_dupack,
763 .maxlen = sizeof(int),
765 .proc_handler = proc_dointvec
768 .procname = "tcp_early_retrans",
769 .data = &sysctl_tcp_early_retrans,
770 .maxlen = sizeof(int),
772 .proc_handler = proc_dointvec_minmax,
777 .procname = "udp_mem",
778 .data = &sysctl_udp_mem,
779 .maxlen = sizeof(sysctl_udp_mem),
781 .proc_handler = proc_doulongvec_minmax,
784 .procname = "udp_rmem_min",
785 .data = &sysctl_udp_rmem_min,
786 .maxlen = sizeof(sysctl_udp_rmem_min),
788 .proc_handler = proc_dointvec_minmax,
792 .procname = "udp_wmem_min",
793 .data = &sysctl_udp_wmem_min,
794 .maxlen = sizeof(sysctl_udp_wmem_min),
796 .proc_handler = proc_dointvec_minmax,
802 static struct ctl_table ipv4_net_table[] = {
804 .procname = "icmp_echo_ignore_all",
805 .data = &init_net.ipv4.sysctl_icmp_echo_ignore_all,
806 .maxlen = sizeof(int),
808 .proc_handler = proc_dointvec
811 .procname = "icmp_echo_ignore_broadcasts",
812 .data = &init_net.ipv4.sysctl_icmp_echo_ignore_broadcasts,
813 .maxlen = sizeof(int),
815 .proc_handler = proc_dointvec
818 .procname = "icmp_ignore_bogus_error_responses",
819 .data = &init_net.ipv4.sysctl_icmp_ignore_bogus_error_responses,
820 .maxlen = sizeof(int),
822 .proc_handler = proc_dointvec
825 .procname = "icmp_errors_use_inbound_ifaddr",
826 .data = &init_net.ipv4.sysctl_icmp_errors_use_inbound_ifaddr,
827 .maxlen = sizeof(int),
829 .proc_handler = proc_dointvec
832 .procname = "icmp_ratelimit",
833 .data = &init_net.ipv4.sysctl_icmp_ratelimit,
834 .maxlen = sizeof(int),
836 .proc_handler = proc_dointvec_ms_jiffies,
839 .procname = "icmp_ratemask",
840 .data = &init_net.ipv4.sysctl_icmp_ratemask,
841 .maxlen = sizeof(int),
843 .proc_handler = proc_dointvec
846 .procname = "ping_group_range",
847 .data = &init_net.ipv4.sysctl_ping_group_range,
848 .maxlen = sizeof(gid_t)*2,
850 .proc_handler = ipv4_ping_group_range,
853 .procname = "tcp_mem",
854 .maxlen = sizeof(init_net.ipv4.sysctl_tcp_mem),
856 .proc_handler = ipv4_tcp_mem,
861 static __net_init int ipv4_sysctl_init_net(struct net *net)
863 struct ctl_table *table;
865 table = ipv4_net_table;
866 if (!net_eq(net, &init_net)) {
867 table = kmemdup(table, sizeof(ipv4_net_table), GFP_KERNEL);
872 &net->ipv4.sysctl_icmp_echo_ignore_all;
874 &net->ipv4.sysctl_icmp_echo_ignore_broadcasts;
876 &net->ipv4.sysctl_icmp_ignore_bogus_error_responses;
878 &net->ipv4.sysctl_icmp_errors_use_inbound_ifaddr;
880 &net->ipv4.sysctl_icmp_ratelimit;
882 &net->ipv4.sysctl_icmp_ratemask;
884 &net->ipv4.sysctl_ping_group_range;
886 /* Don't export sysctls to unprivileged users */
887 if (net->user_ns != &init_user_ns)
888 table[0].procname = NULL;
892 * Sane defaults - nobody may create ping sockets.
893 * Boot scripts should set this to distro-specific group.
895 net->ipv4.sysctl_ping_group_range[0] = make_kgid(&init_user_ns, 1);
896 net->ipv4.sysctl_ping_group_range[1] = make_kgid(&init_user_ns, 0);
900 net->ipv4.ipv4_hdr = register_net_sysctl(net, "net/ipv4", table);
901 if (net->ipv4.ipv4_hdr == NULL)
907 if (!net_eq(net, &init_net))
913 static __net_exit void ipv4_sysctl_exit_net(struct net *net)
915 struct ctl_table *table;
917 table = net->ipv4.ipv4_hdr->ctl_table_arg;
918 unregister_net_sysctl_table(net->ipv4.ipv4_hdr);
922 static __net_initdata struct pernet_operations ipv4_sysctl_ops = {
923 .init = ipv4_sysctl_init_net,
924 .exit = ipv4_sysctl_exit_net,
927 static __init int sysctl_ipv4_init(void)
929 struct ctl_table_header *hdr;
932 for (i = ipv4_table; i->procname; i++) {
933 if (strcmp(i->procname, "ip_local_reserved_ports") == 0) {
934 i->data = sysctl_local_reserved_ports;
941 hdr = register_net_sysctl(&init_net, "net/ipv4", ipv4_table);
945 if (register_pernet_subsys(&ipv4_sysctl_ops)) {
946 unregister_net_sysctl_table(hdr);
953 __initcall(sysctl_ipv4_init);