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(struct ctl_table *table, int write,
57 size_t *lenp, loff_t *ppos)
61 struct ctl_table tmp = {
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(struct ctl_table *table, int write,
108 size_t *lenp, loff_t *ppos)
110 struct user_namespace *user_ns = current_user_ns();
114 struct ctl_table tmp = {
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 static int proc_tcp_congestion_control(struct ctl_table *ctl, int write,
142 void __user *buffer, size_t *lenp, loff_t *ppos)
144 char val[TCP_CA_NAME_MAX];
145 struct ctl_table tbl = {
147 .maxlen = TCP_CA_NAME_MAX,
151 tcp_get_default_congestion_control(val);
153 ret = proc_dostring(&tbl, write, buffer, lenp, ppos);
154 if (write && ret == 0)
155 ret = tcp_set_default_congestion_control(val);
159 static int proc_tcp_available_congestion_control(struct ctl_table *ctl,
161 void __user *buffer, size_t *lenp,
164 struct ctl_table tbl = { .maxlen = TCP_CA_BUF_MAX, };
167 tbl.data = kmalloc(tbl.maxlen, GFP_USER);
170 tcp_get_available_congestion_control(tbl.data, TCP_CA_BUF_MAX);
171 ret = proc_dostring(&tbl, write, buffer, lenp, ppos);
176 static int proc_allowed_congestion_control(struct ctl_table *ctl,
178 void __user *buffer, size_t *lenp,
181 struct ctl_table tbl = { .maxlen = TCP_CA_BUF_MAX };
184 tbl.data = kmalloc(tbl.maxlen, GFP_USER);
188 tcp_get_allowed_congestion_control(tbl.data, tbl.maxlen);
189 ret = proc_dostring(&tbl, write, buffer, lenp, ppos);
190 if (write && ret == 0)
191 ret = tcp_set_allowed_congestion_control(tbl.data);
196 static int ipv4_tcp_mem(struct ctl_table *ctl, int write,
197 void __user *buffer, size_t *lenp,
201 unsigned long vec[3];
202 struct net *net = current->nsproxy->net_ns;
203 #ifdef CONFIG_MEMCG_KMEM
204 struct mem_cgroup *memcg;
207 struct ctl_table tmp = {
209 .maxlen = sizeof(vec),
214 ctl->data = &net->ipv4.sysctl_tcp_mem;
215 return proc_doulongvec_minmax(ctl, write, buffer, lenp, ppos);
218 ret = proc_doulongvec_minmax(&tmp, write, buffer, lenp, ppos);
222 #ifdef CONFIG_MEMCG_KMEM
224 memcg = mem_cgroup_from_task(current);
226 tcp_prot_mem(memcg, vec[0], 0);
227 tcp_prot_mem(memcg, vec[1], 1);
228 tcp_prot_mem(memcg, vec[2], 2);
232 net->ipv4.sysctl_tcp_mem[0] = vec[0];
233 net->ipv4.sysctl_tcp_mem[1] = vec[1];
234 net->ipv4.sysctl_tcp_mem[2] = vec[2];
239 static int proc_tcp_fastopen_key(struct ctl_table *ctl, int write,
240 void __user *buffer, size_t *lenp,
243 struct ctl_table tbl = { .maxlen = (TCP_FASTOPEN_KEY_LENGTH * 2 + 10) };
244 struct tcp_fastopen_context *ctxt;
246 u32 user_key[4]; /* 16 bytes, matching TCP_FASTOPEN_KEY_LENGTH */
248 tbl.data = kmalloc(tbl.maxlen, GFP_KERNEL);
253 ctxt = rcu_dereference(tcp_fastopen_ctx);
255 memcpy(user_key, ctxt->key, TCP_FASTOPEN_KEY_LENGTH);
257 memset(user_key, 0, sizeof(user_key));
260 snprintf(tbl.data, tbl.maxlen, "%08x-%08x-%08x-%08x",
261 user_key[0], user_key[1], user_key[2], user_key[3]);
262 ret = proc_dostring(&tbl, write, buffer, lenp, ppos);
264 if (write && ret == 0) {
265 if (sscanf(tbl.data, "%x-%x-%x-%x", user_key, user_key + 1,
266 user_key + 2, user_key + 3) != 4) {
270 tcp_fastopen_reset_cipher(user_key, TCP_FASTOPEN_KEY_LENGTH);
274 pr_debug("proc FO key set 0x%x-%x-%x-%x <- 0x%s: %u\n",
275 user_key[0], user_key[1], user_key[2], user_key[3],
276 (char *)tbl.data, ret);
281 static struct ctl_table ipv4_table[] = {
283 .procname = "tcp_timestamps",
284 .data = &sysctl_tcp_timestamps,
285 .maxlen = sizeof(int),
287 .proc_handler = proc_dointvec
290 .procname = "tcp_window_scaling",
291 .data = &sysctl_tcp_window_scaling,
292 .maxlen = sizeof(int),
294 .proc_handler = proc_dointvec
297 .procname = "tcp_sack",
298 .data = &sysctl_tcp_sack,
299 .maxlen = sizeof(int),
301 .proc_handler = proc_dointvec
304 .procname = "tcp_retrans_collapse",
305 .data = &sysctl_tcp_retrans_collapse,
306 .maxlen = sizeof(int),
308 .proc_handler = proc_dointvec
311 .procname = "ip_default_ttl",
312 .data = &sysctl_ip_default_ttl,
313 .maxlen = sizeof(int),
315 .proc_handler = proc_dointvec_minmax,
316 .extra1 = &ip_ttl_min,
317 .extra2 = &ip_ttl_max,
320 .procname = "ip_no_pmtu_disc",
321 .data = &ipv4_config.no_pmtu_disc,
322 .maxlen = sizeof(int),
324 .proc_handler = proc_dointvec
327 .procname = "ip_nonlocal_bind",
328 .data = &sysctl_ip_nonlocal_bind,
329 .maxlen = sizeof(int),
331 .proc_handler = proc_dointvec
334 .procname = "tcp_syn_retries",
335 .data = &sysctl_tcp_syn_retries,
336 .maxlen = sizeof(int),
338 .proc_handler = proc_dointvec_minmax,
339 .extra1 = &tcp_syn_retries_min,
340 .extra2 = &tcp_syn_retries_max
343 .procname = "tcp_synack_retries",
344 .data = &sysctl_tcp_synack_retries,
345 .maxlen = sizeof(int),
347 .proc_handler = proc_dointvec
350 .procname = "tcp_max_orphans",
351 .data = &sysctl_tcp_max_orphans,
352 .maxlen = sizeof(int),
354 .proc_handler = proc_dointvec
357 .procname = "tcp_max_tw_buckets",
358 .data = &tcp_death_row.sysctl_max_tw_buckets,
359 .maxlen = sizeof(int),
361 .proc_handler = proc_dointvec
364 .procname = "ip_early_demux",
365 .data = &sysctl_ip_early_demux,
366 .maxlen = sizeof(int),
368 .proc_handler = proc_dointvec
371 .procname = "ip_dynaddr",
372 .data = &sysctl_ip_dynaddr,
373 .maxlen = sizeof(int),
375 .proc_handler = proc_dointvec
378 .procname = "tcp_keepalive_time",
379 .data = &sysctl_tcp_keepalive_time,
380 .maxlen = sizeof(int),
382 .proc_handler = proc_dointvec_jiffies,
385 .procname = "tcp_keepalive_probes",
386 .data = &sysctl_tcp_keepalive_probes,
387 .maxlen = sizeof(int),
389 .proc_handler = proc_dointvec
392 .procname = "tcp_keepalive_intvl",
393 .data = &sysctl_tcp_keepalive_intvl,
394 .maxlen = sizeof(int),
396 .proc_handler = proc_dointvec_jiffies,
399 .procname = "tcp_retries1",
400 .data = &sysctl_tcp_retries1,
401 .maxlen = sizeof(int),
403 .proc_handler = proc_dointvec_minmax,
404 .extra2 = &tcp_retr1_max
407 .procname = "tcp_retries2",
408 .data = &sysctl_tcp_retries2,
409 .maxlen = sizeof(int),
411 .proc_handler = proc_dointvec
414 .procname = "tcp_fin_timeout",
415 .data = &sysctl_tcp_fin_timeout,
416 .maxlen = sizeof(int),
418 .proc_handler = proc_dointvec_jiffies,
420 #ifdef CONFIG_SYN_COOKIES
422 .procname = "tcp_syncookies",
423 .data = &sysctl_tcp_syncookies,
424 .maxlen = sizeof(int),
426 .proc_handler = proc_dointvec
430 .procname = "tcp_fastopen",
431 .data = &sysctl_tcp_fastopen,
432 .maxlen = sizeof(int),
434 .proc_handler = proc_dointvec,
437 .procname = "tcp_fastopen_key",
439 .maxlen = ((TCP_FASTOPEN_KEY_LENGTH * 2) + 10),
440 .proc_handler = proc_tcp_fastopen_key,
443 .procname = "tcp_tw_recycle",
444 .data = &tcp_death_row.sysctl_tw_recycle,
445 .maxlen = sizeof(int),
447 .proc_handler = proc_dointvec
450 .procname = "tcp_abort_on_overflow",
451 .data = &sysctl_tcp_abort_on_overflow,
452 .maxlen = sizeof(int),
454 .proc_handler = proc_dointvec
457 .procname = "tcp_stdurg",
458 .data = &sysctl_tcp_stdurg,
459 .maxlen = sizeof(int),
461 .proc_handler = proc_dointvec
464 .procname = "tcp_rfc1337",
465 .data = &sysctl_tcp_rfc1337,
466 .maxlen = sizeof(int),
468 .proc_handler = proc_dointvec
471 .procname = "tcp_max_syn_backlog",
472 .data = &sysctl_max_syn_backlog,
473 .maxlen = sizeof(int),
475 .proc_handler = proc_dointvec
478 .procname = "ip_local_port_range",
479 .data = &sysctl_local_ports.range,
480 .maxlen = sizeof(sysctl_local_ports.range),
482 .proc_handler = ipv4_local_port_range,
485 .procname = "ip_local_reserved_ports",
486 .data = NULL, /* initialized in sysctl_ipv4_init */
489 .proc_handler = proc_do_large_bitmap,
492 .procname = "igmp_max_memberships",
493 .data = &sysctl_igmp_max_memberships,
494 .maxlen = sizeof(int),
496 .proc_handler = proc_dointvec
499 .procname = "igmp_max_msf",
500 .data = &sysctl_igmp_max_msf,
501 .maxlen = sizeof(int),
503 .proc_handler = proc_dointvec
506 .procname = "inet_peer_threshold",
507 .data = &inet_peer_threshold,
508 .maxlen = sizeof(int),
510 .proc_handler = proc_dointvec
513 .procname = "inet_peer_minttl",
514 .data = &inet_peer_minttl,
515 .maxlen = sizeof(int),
517 .proc_handler = proc_dointvec_jiffies,
520 .procname = "inet_peer_maxttl",
521 .data = &inet_peer_maxttl,
522 .maxlen = sizeof(int),
524 .proc_handler = proc_dointvec_jiffies,
527 .procname = "tcp_orphan_retries",
528 .data = &sysctl_tcp_orphan_retries,
529 .maxlen = sizeof(int),
531 .proc_handler = proc_dointvec
534 .procname = "tcp_fack",
535 .data = &sysctl_tcp_fack,
536 .maxlen = sizeof(int),
538 .proc_handler = proc_dointvec
541 .procname = "tcp_reordering",
542 .data = &sysctl_tcp_reordering,
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_minmax,
563 .procname = "tcp_notsent_lowat",
564 .data = &sysctl_tcp_notsent_lowat,
565 .maxlen = sizeof(sysctl_tcp_notsent_lowat),
567 .proc_handler = proc_dointvec,
570 .procname = "tcp_rmem",
571 .data = &sysctl_tcp_rmem,
572 .maxlen = sizeof(sysctl_tcp_rmem),
574 .proc_handler = proc_dointvec_minmax,
578 .procname = "tcp_app_win",
579 .data = &sysctl_tcp_app_win,
580 .maxlen = sizeof(int),
582 .proc_handler = proc_dointvec
585 .procname = "tcp_adv_win_scale",
586 .data = &sysctl_tcp_adv_win_scale,
587 .maxlen = sizeof(int),
589 .proc_handler = proc_dointvec_minmax,
590 .extra1 = &tcp_adv_win_scale_min,
591 .extra2 = &tcp_adv_win_scale_max,
594 .procname = "tcp_tw_reuse",
595 .data = &sysctl_tcp_tw_reuse,
596 .maxlen = sizeof(int),
598 .proc_handler = proc_dointvec
601 .procname = "tcp_frto",
602 .data = &sysctl_tcp_frto,
603 .maxlen = sizeof(int),
605 .proc_handler = proc_dointvec
608 .procname = "tcp_low_latency",
609 .data = &sysctl_tcp_low_latency,
610 .maxlen = sizeof(int),
612 .proc_handler = proc_dointvec
615 .procname = "tcp_no_metrics_save",
616 .data = &sysctl_tcp_nometrics_save,
617 .maxlen = sizeof(int),
619 .proc_handler = proc_dointvec,
622 .procname = "tcp_moderate_rcvbuf",
623 .data = &sysctl_tcp_moderate_rcvbuf,
624 .maxlen = sizeof(int),
626 .proc_handler = proc_dointvec,
629 .procname = "tcp_tso_win_divisor",
630 .data = &sysctl_tcp_tso_win_divisor,
631 .maxlen = sizeof(int),
633 .proc_handler = proc_dointvec,
636 .procname = "tcp_congestion_control",
638 .maxlen = TCP_CA_NAME_MAX,
639 .proc_handler = proc_tcp_congestion_control,
642 .procname = "tcp_mtu_probing",
643 .data = &sysctl_tcp_mtu_probing,
644 .maxlen = sizeof(int),
646 .proc_handler = proc_dointvec,
649 .procname = "tcp_base_mss",
650 .data = &sysctl_tcp_base_mss,
651 .maxlen = sizeof(int),
653 .proc_handler = proc_dointvec,
656 .procname = "tcp_workaround_signed_windows",
657 .data = &sysctl_tcp_workaround_signed_windows,
658 .maxlen = sizeof(int),
660 .proc_handler = proc_dointvec
663 .procname = "tcp_limit_output_bytes",
664 .data = &sysctl_tcp_limit_output_bytes,
665 .maxlen = sizeof(int),
667 .proc_handler = proc_dointvec
670 .procname = "tcp_challenge_ack_limit",
671 .data = &sysctl_tcp_challenge_ack_limit,
672 .maxlen = sizeof(int),
674 .proc_handler = proc_dointvec
676 #ifdef CONFIG_NET_DMA
678 .procname = "tcp_dma_copybreak",
679 .data = &sysctl_tcp_dma_copybreak,
680 .maxlen = sizeof(int),
682 .proc_handler = proc_dointvec
686 .procname = "tcp_slow_start_after_idle",
687 .data = &sysctl_tcp_slow_start_after_idle,
688 .maxlen = sizeof(int),
690 .proc_handler = proc_dointvec
692 #ifdef CONFIG_NETLABEL
694 .procname = "cipso_cache_enable",
695 .data = &cipso_v4_cache_enabled,
696 .maxlen = sizeof(int),
698 .proc_handler = proc_dointvec,
701 .procname = "cipso_cache_bucket_size",
702 .data = &cipso_v4_cache_bucketsize,
703 .maxlen = sizeof(int),
705 .proc_handler = proc_dointvec,
708 .procname = "cipso_rbm_optfmt",
709 .data = &cipso_v4_rbm_optfmt,
710 .maxlen = sizeof(int),
712 .proc_handler = proc_dointvec,
715 .procname = "cipso_rbm_strictvalid",
716 .data = &cipso_v4_rbm_strictvalid,
717 .maxlen = sizeof(int),
719 .proc_handler = proc_dointvec,
721 #endif /* CONFIG_NETLABEL */
723 .procname = "tcp_available_congestion_control",
724 .maxlen = TCP_CA_BUF_MAX,
726 .proc_handler = proc_tcp_available_congestion_control,
729 .procname = "tcp_allowed_congestion_control",
730 .maxlen = TCP_CA_BUF_MAX,
732 .proc_handler = proc_allowed_congestion_control,
735 .procname = "tcp_max_ssthresh",
736 .data = &sysctl_tcp_max_ssthresh,
737 .maxlen = sizeof(int),
739 .proc_handler = proc_dointvec,
742 .procname = "tcp_thin_linear_timeouts",
743 .data = &sysctl_tcp_thin_linear_timeouts,
744 .maxlen = sizeof(int),
746 .proc_handler = proc_dointvec
749 .procname = "tcp_thin_dupack",
750 .data = &sysctl_tcp_thin_dupack,
751 .maxlen = sizeof(int),
753 .proc_handler = proc_dointvec
756 .procname = "tcp_early_retrans",
757 .data = &sysctl_tcp_early_retrans,
758 .maxlen = sizeof(int),
760 .proc_handler = proc_dointvec_minmax,
765 .procname = "tcp_min_tso_segs",
766 .data = &sysctl_tcp_min_tso_segs,
767 .maxlen = sizeof(int),
769 .proc_handler = proc_dointvec_minmax,
771 .extra2 = &gso_max_segs,
774 .procname = "udp_mem",
775 .data = &sysctl_udp_mem,
776 .maxlen = sizeof(sysctl_udp_mem),
778 .proc_handler = proc_doulongvec_minmax,
781 .procname = "udp_rmem_min",
782 .data = &sysctl_udp_rmem_min,
783 .maxlen = sizeof(sysctl_udp_rmem_min),
785 .proc_handler = proc_dointvec_minmax,
789 .procname = "udp_wmem_min",
790 .data = &sysctl_udp_wmem_min,
791 .maxlen = sizeof(sysctl_udp_wmem_min),
793 .proc_handler = proc_dointvec_minmax,
799 static struct ctl_table ipv4_net_table[] = {
801 .procname = "icmp_echo_ignore_all",
802 .data = &init_net.ipv4.sysctl_icmp_echo_ignore_all,
803 .maxlen = sizeof(int),
805 .proc_handler = proc_dointvec
808 .procname = "icmp_echo_ignore_broadcasts",
809 .data = &init_net.ipv4.sysctl_icmp_echo_ignore_broadcasts,
810 .maxlen = sizeof(int),
812 .proc_handler = proc_dointvec
815 .procname = "icmp_ignore_bogus_error_responses",
816 .data = &init_net.ipv4.sysctl_icmp_ignore_bogus_error_responses,
817 .maxlen = sizeof(int),
819 .proc_handler = proc_dointvec
822 .procname = "icmp_errors_use_inbound_ifaddr",
823 .data = &init_net.ipv4.sysctl_icmp_errors_use_inbound_ifaddr,
824 .maxlen = sizeof(int),
826 .proc_handler = proc_dointvec
829 .procname = "icmp_ratelimit",
830 .data = &init_net.ipv4.sysctl_icmp_ratelimit,
831 .maxlen = sizeof(int),
833 .proc_handler = proc_dointvec_ms_jiffies,
836 .procname = "icmp_ratemask",
837 .data = &init_net.ipv4.sysctl_icmp_ratemask,
838 .maxlen = sizeof(int),
840 .proc_handler = proc_dointvec
843 .procname = "ping_group_range",
844 .data = &init_net.ipv4.sysctl_ping_group_range,
845 .maxlen = sizeof(gid_t)*2,
847 .proc_handler = ipv4_ping_group_range,
850 .procname = "tcp_ecn",
851 .data = &init_net.ipv4.sysctl_tcp_ecn,
852 .maxlen = sizeof(int),
854 .proc_handler = proc_dointvec
857 .procname = "tcp_mem",
858 .maxlen = sizeof(init_net.ipv4.sysctl_tcp_mem),
860 .proc_handler = ipv4_tcp_mem,
865 static __net_init int ipv4_sysctl_init_net(struct net *net)
867 struct ctl_table *table;
869 table = ipv4_net_table;
870 if (!net_eq(net, &init_net)) {
871 table = kmemdup(table, sizeof(ipv4_net_table), GFP_KERNEL);
876 &net->ipv4.sysctl_icmp_echo_ignore_all;
878 &net->ipv4.sysctl_icmp_echo_ignore_broadcasts;
880 &net->ipv4.sysctl_icmp_ignore_bogus_error_responses;
882 &net->ipv4.sysctl_icmp_errors_use_inbound_ifaddr;
884 &net->ipv4.sysctl_icmp_ratelimit;
886 &net->ipv4.sysctl_icmp_ratemask;
888 &net->ipv4.sysctl_ping_group_range;
890 &net->ipv4.sysctl_tcp_ecn;
892 /* Don't export sysctls to unprivileged users */
893 if (net->user_ns != &init_user_ns)
894 table[0].procname = NULL;
898 * Sane defaults - nobody may create ping sockets.
899 * Boot scripts should set this to distro-specific group.
901 net->ipv4.sysctl_ping_group_range[0] = make_kgid(&init_user_ns, 1);
902 net->ipv4.sysctl_ping_group_range[1] = make_kgid(&init_user_ns, 0);
906 net->ipv4.ipv4_hdr = register_net_sysctl(net, "net/ipv4", table);
907 if (net->ipv4.ipv4_hdr == NULL)
913 if (!net_eq(net, &init_net))
919 static __net_exit void ipv4_sysctl_exit_net(struct net *net)
921 struct ctl_table *table;
923 table = net->ipv4.ipv4_hdr->ctl_table_arg;
924 unregister_net_sysctl_table(net->ipv4.ipv4_hdr);
928 static __net_initdata struct pernet_operations ipv4_sysctl_ops = {
929 .init = ipv4_sysctl_init_net,
930 .exit = ipv4_sysctl_exit_net,
933 static __init int sysctl_ipv4_init(void)
935 struct ctl_table_header *hdr;
938 for (i = ipv4_table; i->procname; i++) {
939 if (strcmp(i->procname, "ip_local_reserved_ports") == 0) {
940 i->data = sysctl_local_reserved_ports;
947 hdr = register_net_sysctl(&init_net, "net/ipv4", ipv4_table);
951 if (register_pernet_subsys(&ipv4_sysctl_ops)) {
952 unregister_net_sysctl_table(hdr);
959 __initcall(sysctl_ipv4_init);