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 tcp_retr1_max = 255;
33 static int ip_local_port_range_min[] = { 1, 1 };
34 static int ip_local_port_range_max[] = { 65535, 65535 };
35 static int tcp_adv_win_scale_min = -31;
36 static int tcp_adv_win_scale_max = 31;
37 static int ip_ttl_min = 1;
38 static int ip_ttl_max = 255;
39 static int tcp_syn_retries_min = 1;
40 static int tcp_syn_retries_max = MAX_TCP_SYNCNT;
41 static int ip_ping_group_range_min[] = { 0, 0 };
42 static int ip_ping_group_range_max[] = { GID_T_MAX, GID_T_MAX };
44 /* Update system visible IP port range */
45 static void set_local_port_range(int range[2])
47 write_seqlock(&sysctl_local_ports.lock);
48 sysctl_local_ports.range[0] = range[0];
49 sysctl_local_ports.range[1] = range[1];
50 write_sequnlock(&sysctl_local_ports.lock);
53 /* Validate changes from /proc interface. */
54 static int ipv4_local_port_range(struct ctl_table *table, int write,
56 size_t *lenp, loff_t *ppos)
60 struct ctl_table tmp = {
62 .maxlen = sizeof(range),
64 .extra1 = &ip_local_port_range_min,
65 .extra2 = &ip_local_port_range_max,
68 inet_get_local_port_range(range, range + 1);
69 ret = proc_dointvec_minmax(&tmp, write, buffer, lenp, ppos);
71 if (write && ret == 0) {
72 if (range[1] < range[0])
75 set_local_port_range(range);
82 static void inet_get_ping_group_range_table(struct ctl_table *table, kgid_t *low, kgid_t *high)
84 kgid_t *data = table->data;
87 seq = read_seqbegin(&sysctl_local_ports.lock);
91 } while (read_seqretry(&sysctl_local_ports.lock, seq));
94 /* Update system visible IP port range */
95 static void set_ping_group_range(struct ctl_table *table, kgid_t low, kgid_t high)
97 kgid_t *data = table->data;
98 write_seqlock(&sysctl_local_ports.lock);
101 write_sequnlock(&sysctl_local_ports.lock);
104 /* Validate changes from /proc interface. */
105 static int ipv4_ping_group_range(struct ctl_table *table, int write,
107 size_t *lenp, loff_t *ppos)
109 struct user_namespace *user_ns = current_user_ns();
113 struct ctl_table tmp = {
115 .maxlen = sizeof(urange),
117 .extra1 = &ip_ping_group_range_min,
118 .extra2 = &ip_ping_group_range_max,
121 inet_get_ping_group_range_table(table, &low, &high);
122 urange[0] = from_kgid_munged(user_ns, low);
123 urange[1] = from_kgid_munged(user_ns, high);
124 ret = proc_dointvec_minmax(&tmp, write, buffer, lenp, ppos);
126 if (write && ret == 0) {
127 low = make_kgid(user_ns, urange[0]);
128 high = make_kgid(user_ns, urange[1]);
129 if (!gid_valid(low) || !gid_valid(high) ||
130 (urange[1] < urange[0]) || gid_lt(high, low)) {
131 low = make_kgid(&init_user_ns, 1);
132 high = make_kgid(&init_user_ns, 0);
134 set_ping_group_range(table, low, high);
140 static int proc_tcp_congestion_control(struct ctl_table *ctl, int write,
141 void __user *buffer, size_t *lenp, loff_t *ppos)
143 char val[TCP_CA_NAME_MAX];
144 struct ctl_table tbl = {
146 .maxlen = TCP_CA_NAME_MAX,
150 tcp_get_default_congestion_control(val);
152 ret = proc_dostring(&tbl, write, buffer, lenp, ppos);
153 if (write && ret == 0)
154 ret = tcp_set_default_congestion_control(val);
158 static int proc_tcp_available_congestion_control(struct ctl_table *ctl,
160 void __user *buffer, size_t *lenp,
163 struct ctl_table tbl = { .maxlen = TCP_CA_BUF_MAX, };
166 tbl.data = kmalloc(tbl.maxlen, GFP_USER);
169 tcp_get_available_congestion_control(tbl.data, TCP_CA_BUF_MAX);
170 ret = proc_dostring(&tbl, write, buffer, lenp, ppos);
175 static int proc_allowed_congestion_control(struct ctl_table *ctl,
177 void __user *buffer, size_t *lenp,
180 struct ctl_table tbl = { .maxlen = TCP_CA_BUF_MAX };
183 tbl.data = kmalloc(tbl.maxlen, GFP_USER);
187 tcp_get_allowed_congestion_control(tbl.data, tbl.maxlen);
188 ret = proc_dostring(&tbl, write, buffer, lenp, ppos);
189 if (write && ret == 0)
190 ret = tcp_set_allowed_congestion_control(tbl.data);
195 static int ipv4_tcp_mem(struct ctl_table *ctl, int write,
196 void __user *buffer, size_t *lenp,
200 unsigned long vec[3];
201 struct net *net = current->nsproxy->net_ns;
202 #ifdef CONFIG_MEMCG_KMEM
203 struct mem_cgroup *memcg;
206 struct ctl_table tmp = {
208 .maxlen = sizeof(vec),
213 ctl->data = &net->ipv4.sysctl_tcp_mem;
214 return proc_doulongvec_minmax(ctl, write, buffer, lenp, ppos);
217 ret = proc_doulongvec_minmax(&tmp, write, buffer, lenp, ppos);
221 #ifdef CONFIG_MEMCG_KMEM
223 memcg = mem_cgroup_from_task(current);
225 tcp_prot_mem(memcg, vec[0], 0);
226 tcp_prot_mem(memcg, vec[1], 1);
227 tcp_prot_mem(memcg, vec[2], 2);
231 net->ipv4.sysctl_tcp_mem[0] = vec[0];
232 net->ipv4.sysctl_tcp_mem[1] = vec[1];
233 net->ipv4.sysctl_tcp_mem[2] = vec[2];
238 static int proc_tcp_fastopen_key(struct ctl_table *ctl, int write,
239 void __user *buffer, size_t *lenp,
242 struct ctl_table tbl = { .maxlen = (TCP_FASTOPEN_KEY_LENGTH * 2 + 10) };
243 struct tcp_fastopen_context *ctxt;
245 u32 user_key[4]; /* 16 bytes, matching TCP_FASTOPEN_KEY_LENGTH */
247 tbl.data = kmalloc(tbl.maxlen, GFP_KERNEL);
252 ctxt = rcu_dereference(tcp_fastopen_ctx);
254 memcpy(user_key, ctxt->key, TCP_FASTOPEN_KEY_LENGTH);
256 memset(user_key, 0, sizeof(user_key));
259 snprintf(tbl.data, tbl.maxlen, "%08x-%08x-%08x-%08x",
260 user_key[0], user_key[1], user_key[2], user_key[3]);
261 ret = proc_dostring(&tbl, write, buffer, lenp, ppos);
263 if (write && ret == 0) {
264 if (sscanf(tbl.data, "%x-%x-%x-%x", user_key, user_key + 1,
265 user_key + 2, user_key + 3) != 4) {
269 tcp_fastopen_reset_cipher(user_key, TCP_FASTOPEN_KEY_LENGTH);
273 pr_debug("proc FO key set 0x%x-%x-%x-%x <- 0x%s: %u\n",
274 user_key[0], user_key[1], user_key[2], user_key[3],
275 (char *)tbl.data, ret);
280 static struct ctl_table ipv4_table[] = {
282 .procname = "tcp_timestamps",
283 .data = &sysctl_tcp_timestamps,
284 .maxlen = sizeof(int),
286 .proc_handler = proc_dointvec
289 .procname = "tcp_window_scaling",
290 .data = &sysctl_tcp_window_scaling,
291 .maxlen = sizeof(int),
293 .proc_handler = proc_dointvec
296 .procname = "tcp_sack",
297 .data = &sysctl_tcp_sack,
298 .maxlen = sizeof(int),
300 .proc_handler = proc_dointvec
303 .procname = "tcp_retrans_collapse",
304 .data = &sysctl_tcp_retrans_collapse,
305 .maxlen = sizeof(int),
307 .proc_handler = proc_dointvec
310 .procname = "ip_default_ttl",
311 .data = &sysctl_ip_default_ttl,
312 .maxlen = sizeof(int),
314 .proc_handler = proc_dointvec_minmax,
315 .extra1 = &ip_ttl_min,
316 .extra2 = &ip_ttl_max,
319 .procname = "ip_no_pmtu_disc",
320 .data = &ipv4_config.no_pmtu_disc,
321 .maxlen = sizeof(int),
323 .proc_handler = proc_dointvec
326 .procname = "ip_nonlocal_bind",
327 .data = &sysctl_ip_nonlocal_bind,
328 .maxlen = sizeof(int),
330 .proc_handler = proc_dointvec
333 .procname = "tcp_syn_retries",
334 .data = &sysctl_tcp_syn_retries,
335 .maxlen = sizeof(int),
337 .proc_handler = proc_dointvec_minmax,
338 .extra1 = &tcp_syn_retries_min,
339 .extra2 = &tcp_syn_retries_max
342 .procname = "tcp_synack_retries",
343 .data = &sysctl_tcp_synack_retries,
344 .maxlen = sizeof(int),
346 .proc_handler = proc_dointvec
349 .procname = "tcp_max_orphans",
350 .data = &sysctl_tcp_max_orphans,
351 .maxlen = sizeof(int),
353 .proc_handler = proc_dointvec
356 .procname = "tcp_max_tw_buckets",
357 .data = &tcp_death_row.sysctl_max_tw_buckets,
358 .maxlen = sizeof(int),
360 .proc_handler = proc_dointvec
363 .procname = "ip_early_demux",
364 .data = &sysctl_ip_early_demux,
365 .maxlen = sizeof(int),
367 .proc_handler = proc_dointvec
370 .procname = "ip_dynaddr",
371 .data = &sysctl_ip_dynaddr,
372 .maxlen = sizeof(int),
374 .proc_handler = proc_dointvec
377 .procname = "tcp_keepalive_time",
378 .data = &sysctl_tcp_keepalive_time,
379 .maxlen = sizeof(int),
381 .proc_handler = proc_dointvec_jiffies,
384 .procname = "tcp_keepalive_probes",
385 .data = &sysctl_tcp_keepalive_probes,
386 .maxlen = sizeof(int),
388 .proc_handler = proc_dointvec
391 .procname = "tcp_keepalive_intvl",
392 .data = &sysctl_tcp_keepalive_intvl,
393 .maxlen = sizeof(int),
395 .proc_handler = proc_dointvec_jiffies,
398 .procname = "tcp_retries1",
399 .data = &sysctl_tcp_retries1,
400 .maxlen = sizeof(int),
402 .proc_handler = proc_dointvec_minmax,
403 .extra2 = &tcp_retr1_max
406 .procname = "tcp_retries2",
407 .data = &sysctl_tcp_retries2,
408 .maxlen = sizeof(int),
410 .proc_handler = proc_dointvec
413 .procname = "tcp_fin_timeout",
414 .data = &sysctl_tcp_fin_timeout,
415 .maxlen = sizeof(int),
417 .proc_handler = proc_dointvec_jiffies,
419 #ifdef CONFIG_SYN_COOKIES
421 .procname = "tcp_syncookies",
422 .data = &sysctl_tcp_syncookies,
423 .maxlen = sizeof(int),
425 .proc_handler = proc_dointvec
429 .procname = "tcp_fastopen",
430 .data = &sysctl_tcp_fastopen,
431 .maxlen = sizeof(int),
433 .proc_handler = proc_dointvec,
436 .procname = "tcp_fastopen_key",
438 .maxlen = ((TCP_FASTOPEN_KEY_LENGTH * 2) + 10),
439 .proc_handler = proc_tcp_fastopen_key,
442 .procname = "tcp_tw_recycle",
443 .data = &tcp_death_row.sysctl_tw_recycle,
444 .maxlen = sizeof(int),
446 .proc_handler = proc_dointvec
449 .procname = "tcp_abort_on_overflow",
450 .data = &sysctl_tcp_abort_on_overflow,
451 .maxlen = sizeof(int),
453 .proc_handler = proc_dointvec
456 .procname = "tcp_stdurg",
457 .data = &sysctl_tcp_stdurg,
458 .maxlen = sizeof(int),
460 .proc_handler = proc_dointvec
463 .procname = "tcp_rfc1337",
464 .data = &sysctl_tcp_rfc1337,
465 .maxlen = sizeof(int),
467 .proc_handler = proc_dointvec
470 .procname = "tcp_max_syn_backlog",
471 .data = &sysctl_max_syn_backlog,
472 .maxlen = sizeof(int),
474 .proc_handler = proc_dointvec
477 .procname = "ip_local_port_range",
478 .data = &sysctl_local_ports.range,
479 .maxlen = sizeof(sysctl_local_ports.range),
481 .proc_handler = ipv4_local_port_range,
484 .procname = "ip_local_reserved_ports",
485 .data = NULL, /* initialized in sysctl_ipv4_init */
488 .proc_handler = proc_do_large_bitmap,
491 .procname = "igmp_max_memberships",
492 .data = &sysctl_igmp_max_memberships,
493 .maxlen = sizeof(int),
495 .proc_handler = proc_dointvec
498 .procname = "igmp_max_msf",
499 .data = &sysctl_igmp_max_msf,
500 .maxlen = sizeof(int),
502 .proc_handler = proc_dointvec
505 .procname = "inet_peer_threshold",
506 .data = &inet_peer_threshold,
507 .maxlen = sizeof(int),
509 .proc_handler = proc_dointvec
512 .procname = "inet_peer_minttl",
513 .data = &inet_peer_minttl,
514 .maxlen = sizeof(int),
516 .proc_handler = proc_dointvec_jiffies,
519 .procname = "inet_peer_maxttl",
520 .data = &inet_peer_maxttl,
521 .maxlen = sizeof(int),
523 .proc_handler = proc_dointvec_jiffies,
526 .procname = "tcp_orphan_retries",
527 .data = &sysctl_tcp_orphan_retries,
528 .maxlen = sizeof(int),
530 .proc_handler = proc_dointvec
533 .procname = "tcp_fack",
534 .data = &sysctl_tcp_fack,
535 .maxlen = sizeof(int),
537 .proc_handler = proc_dointvec
540 .procname = "tcp_reordering",
541 .data = &sysctl_tcp_reordering,
542 .maxlen = sizeof(int),
544 .proc_handler = proc_dointvec
547 .procname = "tcp_dsack",
548 .data = &sysctl_tcp_dsack,
549 .maxlen = sizeof(int),
551 .proc_handler = proc_dointvec
554 .procname = "tcp_wmem",
555 .data = &sysctl_tcp_wmem,
556 .maxlen = sizeof(sysctl_tcp_wmem),
558 .proc_handler = proc_dointvec_minmax,
562 .procname = "tcp_rmem",
563 .data = &sysctl_tcp_rmem,
564 .maxlen = sizeof(sysctl_tcp_rmem),
566 .proc_handler = proc_dointvec_minmax,
570 .procname = "tcp_app_win",
571 .data = &sysctl_tcp_app_win,
572 .maxlen = sizeof(int),
574 .proc_handler = proc_dointvec
577 .procname = "tcp_adv_win_scale",
578 .data = &sysctl_tcp_adv_win_scale,
579 .maxlen = sizeof(int),
581 .proc_handler = proc_dointvec_minmax,
582 .extra1 = &tcp_adv_win_scale_min,
583 .extra2 = &tcp_adv_win_scale_max,
586 .procname = "tcp_tw_reuse",
587 .data = &sysctl_tcp_tw_reuse,
588 .maxlen = sizeof(int),
590 .proc_handler = proc_dointvec
593 .procname = "tcp_frto",
594 .data = &sysctl_tcp_frto,
595 .maxlen = sizeof(int),
597 .proc_handler = proc_dointvec
600 .procname = "tcp_low_latency",
601 .data = &sysctl_tcp_low_latency,
602 .maxlen = sizeof(int),
604 .proc_handler = proc_dointvec
607 .procname = "tcp_no_metrics_save",
608 .data = &sysctl_tcp_nometrics_save,
609 .maxlen = sizeof(int),
611 .proc_handler = proc_dointvec,
614 .procname = "tcp_moderate_rcvbuf",
615 .data = &sysctl_tcp_moderate_rcvbuf,
616 .maxlen = sizeof(int),
618 .proc_handler = proc_dointvec,
621 .procname = "tcp_tso_win_divisor",
622 .data = &sysctl_tcp_tso_win_divisor,
623 .maxlen = sizeof(int),
625 .proc_handler = proc_dointvec,
628 .procname = "tcp_congestion_control",
630 .maxlen = TCP_CA_NAME_MAX,
631 .proc_handler = proc_tcp_congestion_control,
634 .procname = "tcp_mtu_probing",
635 .data = &sysctl_tcp_mtu_probing,
636 .maxlen = sizeof(int),
638 .proc_handler = proc_dointvec,
641 .procname = "tcp_base_mss",
642 .data = &sysctl_tcp_base_mss,
643 .maxlen = sizeof(int),
645 .proc_handler = proc_dointvec,
648 .procname = "tcp_workaround_signed_windows",
649 .data = &sysctl_tcp_workaround_signed_windows,
650 .maxlen = sizeof(int),
652 .proc_handler = proc_dointvec
655 .procname = "tcp_limit_output_bytes",
656 .data = &sysctl_tcp_limit_output_bytes,
657 .maxlen = sizeof(int),
659 .proc_handler = proc_dointvec
662 .procname = "tcp_challenge_ack_limit",
663 .data = &sysctl_tcp_challenge_ack_limit,
664 .maxlen = sizeof(int),
666 .proc_handler = proc_dointvec
668 #ifdef CONFIG_NET_DMA
670 .procname = "tcp_dma_copybreak",
671 .data = &sysctl_tcp_dma_copybreak,
672 .maxlen = sizeof(int),
674 .proc_handler = proc_dointvec
678 .procname = "tcp_slow_start_after_idle",
679 .data = &sysctl_tcp_slow_start_after_idle,
680 .maxlen = sizeof(int),
682 .proc_handler = proc_dointvec
684 #ifdef CONFIG_NETLABEL
686 .procname = "cipso_cache_enable",
687 .data = &cipso_v4_cache_enabled,
688 .maxlen = sizeof(int),
690 .proc_handler = proc_dointvec,
693 .procname = "cipso_cache_bucket_size",
694 .data = &cipso_v4_cache_bucketsize,
695 .maxlen = sizeof(int),
697 .proc_handler = proc_dointvec,
700 .procname = "cipso_rbm_optfmt",
701 .data = &cipso_v4_rbm_optfmt,
702 .maxlen = sizeof(int),
704 .proc_handler = proc_dointvec,
707 .procname = "cipso_rbm_strictvalid",
708 .data = &cipso_v4_rbm_strictvalid,
709 .maxlen = sizeof(int),
711 .proc_handler = proc_dointvec,
713 #endif /* CONFIG_NETLABEL */
715 .procname = "tcp_available_congestion_control",
716 .maxlen = TCP_CA_BUF_MAX,
718 .proc_handler = proc_tcp_available_congestion_control,
721 .procname = "tcp_allowed_congestion_control",
722 .maxlen = TCP_CA_BUF_MAX,
724 .proc_handler = proc_allowed_congestion_control,
727 .procname = "tcp_max_ssthresh",
728 .data = &sysctl_tcp_max_ssthresh,
729 .maxlen = sizeof(int),
731 .proc_handler = proc_dointvec,
734 .procname = "tcp_thin_linear_timeouts",
735 .data = &sysctl_tcp_thin_linear_timeouts,
736 .maxlen = sizeof(int),
738 .proc_handler = proc_dointvec
741 .procname = "tcp_thin_dupack",
742 .data = &sysctl_tcp_thin_dupack,
743 .maxlen = sizeof(int),
745 .proc_handler = proc_dointvec
748 .procname = "tcp_early_retrans",
749 .data = &sysctl_tcp_early_retrans,
750 .maxlen = sizeof(int),
752 .proc_handler = proc_dointvec_minmax,
757 .procname = "udp_mem",
758 .data = &sysctl_udp_mem,
759 .maxlen = sizeof(sysctl_udp_mem),
761 .proc_handler = proc_doulongvec_minmax,
764 .procname = "udp_rmem_min",
765 .data = &sysctl_udp_rmem_min,
766 .maxlen = sizeof(sysctl_udp_rmem_min),
768 .proc_handler = proc_dointvec_minmax,
772 .procname = "udp_wmem_min",
773 .data = &sysctl_udp_wmem_min,
774 .maxlen = sizeof(sysctl_udp_wmem_min),
776 .proc_handler = proc_dointvec_minmax,
782 static struct ctl_table ipv4_net_table[] = {
784 .procname = "icmp_echo_ignore_all",
785 .data = &init_net.ipv4.sysctl_icmp_echo_ignore_all,
786 .maxlen = sizeof(int),
788 .proc_handler = proc_dointvec
791 .procname = "icmp_echo_ignore_broadcasts",
792 .data = &init_net.ipv4.sysctl_icmp_echo_ignore_broadcasts,
793 .maxlen = sizeof(int),
795 .proc_handler = proc_dointvec
798 .procname = "icmp_ignore_bogus_error_responses",
799 .data = &init_net.ipv4.sysctl_icmp_ignore_bogus_error_responses,
800 .maxlen = sizeof(int),
802 .proc_handler = proc_dointvec
805 .procname = "icmp_errors_use_inbound_ifaddr",
806 .data = &init_net.ipv4.sysctl_icmp_errors_use_inbound_ifaddr,
807 .maxlen = sizeof(int),
809 .proc_handler = proc_dointvec
812 .procname = "icmp_ratelimit",
813 .data = &init_net.ipv4.sysctl_icmp_ratelimit,
814 .maxlen = sizeof(int),
816 .proc_handler = proc_dointvec_ms_jiffies,
819 .procname = "icmp_ratemask",
820 .data = &init_net.ipv4.sysctl_icmp_ratemask,
821 .maxlen = sizeof(int),
823 .proc_handler = proc_dointvec
826 .procname = "ping_group_range",
827 .data = &init_net.ipv4.sysctl_ping_group_range,
828 .maxlen = sizeof(gid_t)*2,
830 .proc_handler = ipv4_ping_group_range,
833 .procname = "tcp_ecn",
834 .data = &init_net.ipv4.sysctl_tcp_ecn,
835 .maxlen = sizeof(int),
837 .proc_handler = proc_dointvec
840 .procname = "tcp_mem",
841 .maxlen = sizeof(init_net.ipv4.sysctl_tcp_mem),
843 .proc_handler = ipv4_tcp_mem,
848 static __net_init int ipv4_sysctl_init_net(struct net *net)
850 struct ctl_table *table;
852 table = ipv4_net_table;
853 if (!net_eq(net, &init_net)) {
854 table = kmemdup(table, sizeof(ipv4_net_table), GFP_KERNEL);
859 &net->ipv4.sysctl_icmp_echo_ignore_all;
861 &net->ipv4.sysctl_icmp_echo_ignore_broadcasts;
863 &net->ipv4.sysctl_icmp_ignore_bogus_error_responses;
865 &net->ipv4.sysctl_icmp_errors_use_inbound_ifaddr;
867 &net->ipv4.sysctl_icmp_ratelimit;
869 &net->ipv4.sysctl_icmp_ratemask;
871 &net->ipv4.sysctl_ping_group_range;
873 &net->ipv4.sysctl_tcp_ecn;
875 /* Don't export sysctls to unprivileged users */
876 if (net->user_ns != &init_user_ns)
877 table[0].procname = NULL;
881 * Sane defaults - nobody may create ping sockets.
882 * Boot scripts should set this to distro-specific group.
884 net->ipv4.sysctl_ping_group_range[0] = make_kgid(&init_user_ns, 1);
885 net->ipv4.sysctl_ping_group_range[1] = make_kgid(&init_user_ns, 0);
889 net->ipv4.ipv4_hdr = register_net_sysctl(net, "net/ipv4", table);
890 if (net->ipv4.ipv4_hdr == NULL)
896 if (!net_eq(net, &init_net))
902 static __net_exit void ipv4_sysctl_exit_net(struct net *net)
904 struct ctl_table *table;
906 table = net->ipv4.ipv4_hdr->ctl_table_arg;
907 unregister_net_sysctl_table(net->ipv4.ipv4_hdr);
911 static __net_initdata struct pernet_operations ipv4_sysctl_ops = {
912 .init = ipv4_sysctl_init_net,
913 .exit = ipv4_sysctl_exit_net,
916 static __init int sysctl_ipv4_init(void)
918 struct ctl_table_header *hdr;
921 for (i = ipv4_table; i->procname; i++) {
922 if (strcmp(i->procname, "ip_local_reserved_ports") == 0) {
923 i->data = sysctl_local_reserved_ports;
930 hdr = register_net_sysctl(&init_net, "net/ipv4", ipv4_table);
934 if (register_pernet_subsys(&ipv4_sysctl_ops)) {
935 unregister_net_sysctl_table(hdr);
942 __initcall(sysctl_ipv4_init);