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 ip_ping_group_range_min
[] = { 0, 0 };
40 static int ip_ping_group_range_max
[] = { GID_T_MAX
, GID_T_MAX
};
42 /* Update system visible IP port range */
43 static void set_local_port_range(int range
[2])
45 write_seqlock(&sysctl_local_ports
.lock
);
46 sysctl_local_ports
.range
[0] = range
[0];
47 sysctl_local_ports
.range
[1] = range
[1];
48 write_sequnlock(&sysctl_local_ports
.lock
);
51 /* Validate changes from /proc interface. */
52 static int ipv4_local_port_range(struct ctl_table
*table
, int write
,
54 size_t *lenp
, loff_t
*ppos
)
58 struct ctl_table tmp
= {
60 .maxlen
= sizeof(range
),
62 .extra1
= &ip_local_port_range_min
,
63 .extra2
= &ip_local_port_range_max
,
66 inet_get_local_port_range(range
, range
+ 1);
67 ret
= proc_dointvec_minmax(&tmp
, write
, buffer
, lenp
, ppos
);
69 if (write
&& ret
== 0) {
70 if (range
[1] < range
[0])
73 set_local_port_range(range
);
80 static void inet_get_ping_group_range_table(struct ctl_table
*table
, kgid_t
*low
, kgid_t
*high
)
82 kgid_t
*data
= table
->data
;
85 seq
= read_seqbegin(&sysctl_local_ports
.lock
);
89 } while (read_seqretry(&sysctl_local_ports
.lock
, seq
));
92 /* Update system visible IP port range */
93 static void set_ping_group_range(struct ctl_table
*table
, kgid_t low
, kgid_t high
)
95 kgid_t
*data
= table
->data
;
96 write_seqlock(&sysctl_local_ports
.lock
);
99 write_sequnlock(&sysctl_local_ports
.lock
);
102 /* Validate changes from /proc interface. */
103 static int ipv4_ping_group_range(struct ctl_table
*table
, int write
,
105 size_t *lenp
, loff_t
*ppos
)
107 struct user_namespace
*user_ns
= current_user_ns();
111 struct ctl_table tmp
= {
113 .maxlen
= sizeof(urange
),
115 .extra1
= &ip_ping_group_range_min
,
116 .extra2
= &ip_ping_group_range_max
,
119 inet_get_ping_group_range_table(table
, &low
, &high
);
120 urange
[0] = from_kgid_munged(user_ns
, low
);
121 urange
[1] = from_kgid_munged(user_ns
, high
);
122 ret
= proc_dointvec_minmax(&tmp
, write
, buffer
, lenp
, ppos
);
124 if (write
&& ret
== 0) {
125 low
= make_kgid(user_ns
, urange
[0]);
126 high
= make_kgid(user_ns
, urange
[1]);
127 if (!gid_valid(low
) || !gid_valid(high
) ||
128 (urange
[1] < urange
[0]) || gid_lt(high
, low
)) {
129 low
= make_kgid(&init_user_ns
, 1);
130 high
= make_kgid(&init_user_ns
, 0);
132 set_ping_group_range(table
, low
, high
);
138 static int proc_tcp_congestion_control(struct ctl_table
*ctl
, int write
,
139 void __user
*buffer
, size_t *lenp
, loff_t
*ppos
)
141 char val
[TCP_CA_NAME_MAX
];
142 struct ctl_table tbl
= {
144 .maxlen
= TCP_CA_NAME_MAX
,
148 tcp_get_default_congestion_control(val
);
150 ret
= proc_dostring(&tbl
, write
, buffer
, lenp
, ppos
);
151 if (write
&& ret
== 0)
152 ret
= tcp_set_default_congestion_control(val
);
156 static int proc_tcp_available_congestion_control(struct ctl_table
*ctl
,
158 void __user
*buffer
, size_t *lenp
,
161 struct ctl_table tbl
= { .maxlen
= TCP_CA_BUF_MAX
, };
164 tbl
.data
= kmalloc(tbl
.maxlen
, GFP_USER
);
167 tcp_get_available_congestion_control(tbl
.data
, TCP_CA_BUF_MAX
);
168 ret
= proc_dostring(&tbl
, write
, buffer
, lenp
, ppos
);
173 static int proc_allowed_congestion_control(struct ctl_table
*ctl
,
175 void __user
*buffer
, size_t *lenp
,
178 struct ctl_table tbl
= { .maxlen
= TCP_CA_BUF_MAX
};
181 tbl
.data
= kmalloc(tbl
.maxlen
, GFP_USER
);
185 tcp_get_allowed_congestion_control(tbl
.data
, tbl
.maxlen
);
186 ret
= proc_dostring(&tbl
, write
, buffer
, lenp
, ppos
);
187 if (write
&& ret
== 0)
188 ret
= tcp_set_allowed_congestion_control(tbl
.data
);
193 static int ipv4_tcp_mem(struct ctl_table
*ctl
, int write
,
194 void __user
*buffer
, size_t *lenp
,
198 unsigned long vec
[3];
199 struct net
*net
= current
->nsproxy
->net_ns
;
200 #ifdef CONFIG_MEMCG_KMEM
201 struct mem_cgroup
*memcg
;
204 struct ctl_table tmp
= {
206 .maxlen
= sizeof(vec
),
211 ctl
->data
= &net
->ipv4
.sysctl_tcp_mem
;
212 return proc_doulongvec_minmax(ctl
, write
, buffer
, lenp
, ppos
);
215 ret
= proc_doulongvec_minmax(&tmp
, write
, buffer
, lenp
, ppos
);
219 #ifdef CONFIG_MEMCG_KMEM
221 memcg
= mem_cgroup_from_task(current
);
223 tcp_prot_mem(memcg
, vec
[0], 0);
224 tcp_prot_mem(memcg
, vec
[1], 1);
225 tcp_prot_mem(memcg
, vec
[2], 2);
229 net
->ipv4
.sysctl_tcp_mem
[0] = vec
[0];
230 net
->ipv4
.sysctl_tcp_mem
[1] = vec
[1];
231 net
->ipv4
.sysctl_tcp_mem
[2] = vec
[2];
236 static int proc_tcp_fastopen_key(struct ctl_table
*ctl
, int write
,
237 void __user
*buffer
, size_t *lenp
,
240 struct ctl_table tbl
= { .maxlen
= (TCP_FASTOPEN_KEY_LENGTH
* 2 + 10) };
241 struct tcp_fastopen_context
*ctxt
;
243 u32 user_key
[4]; /* 16 bytes, matching TCP_FASTOPEN_KEY_LENGTH */
245 tbl
.data
= kmalloc(tbl
.maxlen
, GFP_KERNEL
);
250 ctxt
= rcu_dereference(tcp_fastopen_ctx
);
252 memcpy(user_key
, ctxt
->key
, TCP_FASTOPEN_KEY_LENGTH
);
254 memset(user_key
, 0, sizeof(user_key
));
257 snprintf(tbl
.data
, tbl
.maxlen
, "%08x-%08x-%08x-%08x",
258 user_key
[0], user_key
[1], user_key
[2], user_key
[3]);
259 ret
= proc_dostring(&tbl
, write
, buffer
, lenp
, ppos
);
261 if (write
&& ret
== 0) {
262 if (sscanf(tbl
.data
, "%x-%x-%x-%x", user_key
, user_key
+ 1,
263 user_key
+ 2, user_key
+ 3) != 4) {
267 tcp_fastopen_reset_cipher(user_key
, TCP_FASTOPEN_KEY_LENGTH
);
271 pr_debug("proc FO key set 0x%x-%x-%x-%x <- 0x%s: %u\n",
272 user_key
[0], user_key
[1], user_key
[2], user_key
[3],
273 (char *)tbl
.data
, ret
);
278 static struct ctl_table ipv4_table
[] = {
280 .procname
= "tcp_timestamps",
281 .data
= &sysctl_tcp_timestamps
,
282 .maxlen
= sizeof(int),
284 .proc_handler
= proc_dointvec
287 .procname
= "tcp_window_scaling",
288 .data
= &sysctl_tcp_window_scaling
,
289 .maxlen
= sizeof(int),
291 .proc_handler
= proc_dointvec
294 .procname
= "tcp_sack",
295 .data
= &sysctl_tcp_sack
,
296 .maxlen
= sizeof(int),
298 .proc_handler
= proc_dointvec
301 .procname
= "tcp_retrans_collapse",
302 .data
= &sysctl_tcp_retrans_collapse
,
303 .maxlen
= sizeof(int),
305 .proc_handler
= proc_dointvec
308 .procname
= "ip_default_ttl",
309 .data
= &sysctl_ip_default_ttl
,
310 .maxlen
= sizeof(int),
312 .proc_handler
= proc_dointvec_minmax
,
313 .extra1
= &ip_ttl_min
,
314 .extra2
= &ip_ttl_max
,
317 .procname
= "ip_no_pmtu_disc",
318 .data
= &ipv4_config
.no_pmtu_disc
,
319 .maxlen
= sizeof(int),
321 .proc_handler
= proc_dointvec
324 .procname
= "ip_nonlocal_bind",
325 .data
= &sysctl_ip_nonlocal_bind
,
326 .maxlen
= sizeof(int),
328 .proc_handler
= proc_dointvec
331 .procname
= "tcp_syn_retries",
332 .data
= &sysctl_tcp_syn_retries
,
333 .maxlen
= sizeof(int),
335 .proc_handler
= proc_dointvec
338 .procname
= "tcp_synack_retries",
339 .data
= &sysctl_tcp_synack_retries
,
340 .maxlen
= sizeof(int),
342 .proc_handler
= proc_dointvec
345 .procname
= "tcp_max_orphans",
346 .data
= &sysctl_tcp_max_orphans
,
347 .maxlen
= sizeof(int),
349 .proc_handler
= proc_dointvec
352 .procname
= "tcp_max_tw_buckets",
353 .data
= &tcp_death_row
.sysctl_max_tw_buckets
,
354 .maxlen
= sizeof(int),
356 .proc_handler
= proc_dointvec
359 .procname
= "ip_early_demux",
360 .data
= &sysctl_ip_early_demux
,
361 .maxlen
= sizeof(int),
363 .proc_handler
= proc_dointvec
366 .procname
= "ip_dynaddr",
367 .data
= &sysctl_ip_dynaddr
,
368 .maxlen
= sizeof(int),
370 .proc_handler
= proc_dointvec
373 .procname
= "tcp_keepalive_time",
374 .data
= &sysctl_tcp_keepalive_time
,
375 .maxlen
= sizeof(int),
377 .proc_handler
= proc_dointvec_jiffies
,
380 .procname
= "tcp_keepalive_probes",
381 .data
= &sysctl_tcp_keepalive_probes
,
382 .maxlen
= sizeof(int),
384 .proc_handler
= proc_dointvec
387 .procname
= "tcp_keepalive_intvl",
388 .data
= &sysctl_tcp_keepalive_intvl
,
389 .maxlen
= sizeof(int),
391 .proc_handler
= proc_dointvec_jiffies
,
394 .procname
= "tcp_retries1",
395 .data
= &sysctl_tcp_retries1
,
396 .maxlen
= sizeof(int),
398 .proc_handler
= proc_dointvec_minmax
,
399 .extra2
= &tcp_retr1_max
402 .procname
= "tcp_retries2",
403 .data
= &sysctl_tcp_retries2
,
404 .maxlen
= sizeof(int),
406 .proc_handler
= proc_dointvec
409 .procname
= "tcp_fin_timeout",
410 .data
= &sysctl_tcp_fin_timeout
,
411 .maxlen
= sizeof(int),
413 .proc_handler
= proc_dointvec_jiffies
,
415 #ifdef CONFIG_SYN_COOKIES
417 .procname
= "tcp_syncookies",
418 .data
= &sysctl_tcp_syncookies
,
419 .maxlen
= sizeof(int),
421 .proc_handler
= proc_dointvec
425 .procname
= "tcp_fastopen",
426 .data
= &sysctl_tcp_fastopen
,
427 .maxlen
= sizeof(int),
429 .proc_handler
= proc_dointvec
,
432 .procname
= "tcp_fastopen_key",
434 .maxlen
= ((TCP_FASTOPEN_KEY_LENGTH
* 2) + 10),
435 .proc_handler
= proc_tcp_fastopen_key
,
438 .procname
= "tcp_tw_recycle",
439 .data
= &tcp_death_row
.sysctl_tw_recycle
,
440 .maxlen
= sizeof(int),
442 .proc_handler
= proc_dointvec
445 .procname
= "tcp_abort_on_overflow",
446 .data
= &sysctl_tcp_abort_on_overflow
,
447 .maxlen
= sizeof(int),
449 .proc_handler
= proc_dointvec
452 .procname
= "tcp_stdurg",
453 .data
= &sysctl_tcp_stdurg
,
454 .maxlen
= sizeof(int),
456 .proc_handler
= proc_dointvec
459 .procname
= "tcp_rfc1337",
460 .data
= &sysctl_tcp_rfc1337
,
461 .maxlen
= sizeof(int),
463 .proc_handler
= proc_dointvec
466 .procname
= "tcp_max_syn_backlog",
467 .data
= &sysctl_max_syn_backlog
,
468 .maxlen
= sizeof(int),
470 .proc_handler
= proc_dointvec
473 .procname
= "ip_local_port_range",
474 .data
= &sysctl_local_ports
.range
,
475 .maxlen
= sizeof(sysctl_local_ports
.range
),
477 .proc_handler
= ipv4_local_port_range
,
480 .procname
= "ip_local_reserved_ports",
481 .data
= NULL
, /* initialized in sysctl_ipv4_init */
484 .proc_handler
= proc_do_large_bitmap
,
487 .procname
= "igmp_max_memberships",
488 .data
= &sysctl_igmp_max_memberships
,
489 .maxlen
= sizeof(int),
491 .proc_handler
= proc_dointvec
494 .procname
= "igmp_max_msf",
495 .data
= &sysctl_igmp_max_msf
,
496 .maxlen
= sizeof(int),
498 .proc_handler
= proc_dointvec
501 .procname
= "inet_peer_threshold",
502 .data
= &inet_peer_threshold
,
503 .maxlen
= sizeof(int),
505 .proc_handler
= proc_dointvec
508 .procname
= "inet_peer_minttl",
509 .data
= &inet_peer_minttl
,
510 .maxlen
= sizeof(int),
512 .proc_handler
= proc_dointvec_jiffies
,
515 .procname
= "inet_peer_maxttl",
516 .data
= &inet_peer_maxttl
,
517 .maxlen
= sizeof(int),
519 .proc_handler
= proc_dointvec_jiffies
,
522 .procname
= "tcp_orphan_retries",
523 .data
= &sysctl_tcp_orphan_retries
,
524 .maxlen
= sizeof(int),
526 .proc_handler
= proc_dointvec
529 .procname
= "tcp_fack",
530 .data
= &sysctl_tcp_fack
,
531 .maxlen
= sizeof(int),
533 .proc_handler
= proc_dointvec
536 .procname
= "tcp_reordering",
537 .data
= &sysctl_tcp_reordering
,
538 .maxlen
= sizeof(int),
540 .proc_handler
= proc_dointvec
543 .procname
= "tcp_dsack",
544 .data
= &sysctl_tcp_dsack
,
545 .maxlen
= sizeof(int),
547 .proc_handler
= proc_dointvec
550 .procname
= "tcp_wmem",
551 .data
= &sysctl_tcp_wmem
,
552 .maxlen
= sizeof(sysctl_tcp_wmem
),
554 .proc_handler
= proc_dointvec_minmax
,
558 .procname
= "tcp_rmem",
559 .data
= &sysctl_tcp_rmem
,
560 .maxlen
= sizeof(sysctl_tcp_rmem
),
562 .proc_handler
= proc_dointvec_minmax
,
566 .procname
= "tcp_app_win",
567 .data
= &sysctl_tcp_app_win
,
568 .maxlen
= sizeof(int),
570 .proc_handler
= proc_dointvec
573 .procname
= "tcp_adv_win_scale",
574 .data
= &sysctl_tcp_adv_win_scale
,
575 .maxlen
= sizeof(int),
577 .proc_handler
= proc_dointvec_minmax
,
578 .extra1
= &tcp_adv_win_scale_min
,
579 .extra2
= &tcp_adv_win_scale_max
,
582 .procname
= "tcp_tw_reuse",
583 .data
= &sysctl_tcp_tw_reuse
,
584 .maxlen
= sizeof(int),
586 .proc_handler
= proc_dointvec
589 .procname
= "tcp_frto",
590 .data
= &sysctl_tcp_frto
,
591 .maxlen
= sizeof(int),
593 .proc_handler
= proc_dointvec
596 .procname
= "tcp_low_latency",
597 .data
= &sysctl_tcp_low_latency
,
598 .maxlen
= sizeof(int),
600 .proc_handler
= proc_dointvec
603 .procname
= "tcp_no_metrics_save",
604 .data
= &sysctl_tcp_nometrics_save
,
605 .maxlen
= sizeof(int),
607 .proc_handler
= proc_dointvec
,
610 .procname
= "tcp_moderate_rcvbuf",
611 .data
= &sysctl_tcp_moderate_rcvbuf
,
612 .maxlen
= sizeof(int),
614 .proc_handler
= proc_dointvec
,
617 .procname
= "tcp_tso_win_divisor",
618 .data
= &sysctl_tcp_tso_win_divisor
,
619 .maxlen
= sizeof(int),
621 .proc_handler
= proc_dointvec
,
624 .procname
= "tcp_congestion_control",
626 .maxlen
= TCP_CA_NAME_MAX
,
627 .proc_handler
= proc_tcp_congestion_control
,
630 .procname
= "tcp_mtu_probing",
631 .data
= &sysctl_tcp_mtu_probing
,
632 .maxlen
= sizeof(int),
634 .proc_handler
= proc_dointvec
,
637 .procname
= "tcp_base_mss",
638 .data
= &sysctl_tcp_base_mss
,
639 .maxlen
= sizeof(int),
641 .proc_handler
= proc_dointvec
,
644 .procname
= "tcp_workaround_signed_windows",
645 .data
= &sysctl_tcp_workaround_signed_windows
,
646 .maxlen
= sizeof(int),
648 .proc_handler
= proc_dointvec
651 .procname
= "tcp_limit_output_bytes",
652 .data
= &sysctl_tcp_limit_output_bytes
,
653 .maxlen
= sizeof(int),
655 .proc_handler
= proc_dointvec
658 .procname
= "tcp_challenge_ack_limit",
659 .data
= &sysctl_tcp_challenge_ack_limit
,
660 .maxlen
= sizeof(int),
662 .proc_handler
= proc_dointvec
664 #ifdef CONFIG_NET_DMA
666 .procname
= "tcp_dma_copybreak",
667 .data
= &sysctl_tcp_dma_copybreak
,
668 .maxlen
= sizeof(int),
670 .proc_handler
= proc_dointvec
674 .procname
= "tcp_slow_start_after_idle",
675 .data
= &sysctl_tcp_slow_start_after_idle
,
676 .maxlen
= sizeof(int),
678 .proc_handler
= proc_dointvec
680 #ifdef CONFIG_NETLABEL
682 .procname
= "cipso_cache_enable",
683 .data
= &cipso_v4_cache_enabled
,
684 .maxlen
= sizeof(int),
686 .proc_handler
= proc_dointvec
,
689 .procname
= "cipso_cache_bucket_size",
690 .data
= &cipso_v4_cache_bucketsize
,
691 .maxlen
= sizeof(int),
693 .proc_handler
= proc_dointvec
,
696 .procname
= "cipso_rbm_optfmt",
697 .data
= &cipso_v4_rbm_optfmt
,
698 .maxlen
= sizeof(int),
700 .proc_handler
= proc_dointvec
,
703 .procname
= "cipso_rbm_strictvalid",
704 .data
= &cipso_v4_rbm_strictvalid
,
705 .maxlen
= sizeof(int),
707 .proc_handler
= proc_dointvec
,
709 #endif /* CONFIG_NETLABEL */
711 .procname
= "tcp_available_congestion_control",
712 .maxlen
= TCP_CA_BUF_MAX
,
714 .proc_handler
= proc_tcp_available_congestion_control
,
717 .procname
= "tcp_allowed_congestion_control",
718 .maxlen
= TCP_CA_BUF_MAX
,
720 .proc_handler
= proc_allowed_congestion_control
,
723 .procname
= "tcp_max_ssthresh",
724 .data
= &sysctl_tcp_max_ssthresh
,
725 .maxlen
= sizeof(int),
727 .proc_handler
= proc_dointvec
,
730 .procname
= "tcp_thin_linear_timeouts",
731 .data
= &sysctl_tcp_thin_linear_timeouts
,
732 .maxlen
= sizeof(int),
734 .proc_handler
= proc_dointvec
737 .procname
= "tcp_thin_dupack",
738 .data
= &sysctl_tcp_thin_dupack
,
739 .maxlen
= sizeof(int),
741 .proc_handler
= proc_dointvec
744 .procname
= "tcp_early_retrans",
745 .data
= &sysctl_tcp_early_retrans
,
746 .maxlen
= sizeof(int),
748 .proc_handler
= proc_dointvec_minmax
,
753 .procname
= "udp_mem",
754 .data
= &sysctl_udp_mem
,
755 .maxlen
= sizeof(sysctl_udp_mem
),
757 .proc_handler
= proc_doulongvec_minmax
,
760 .procname
= "udp_rmem_min",
761 .data
= &sysctl_udp_rmem_min
,
762 .maxlen
= sizeof(sysctl_udp_rmem_min
),
764 .proc_handler
= proc_dointvec_minmax
,
768 .procname
= "udp_wmem_min",
769 .data
= &sysctl_udp_wmem_min
,
770 .maxlen
= sizeof(sysctl_udp_wmem_min
),
772 .proc_handler
= proc_dointvec_minmax
,
778 static struct ctl_table ipv4_net_table
[] = {
780 .procname
= "icmp_echo_ignore_all",
781 .data
= &init_net
.ipv4
.sysctl_icmp_echo_ignore_all
,
782 .maxlen
= sizeof(int),
784 .proc_handler
= proc_dointvec
787 .procname
= "icmp_echo_ignore_broadcasts",
788 .data
= &init_net
.ipv4
.sysctl_icmp_echo_ignore_broadcasts
,
789 .maxlen
= sizeof(int),
791 .proc_handler
= proc_dointvec
794 .procname
= "icmp_ignore_bogus_error_responses",
795 .data
= &init_net
.ipv4
.sysctl_icmp_ignore_bogus_error_responses
,
796 .maxlen
= sizeof(int),
798 .proc_handler
= proc_dointvec
801 .procname
= "icmp_errors_use_inbound_ifaddr",
802 .data
= &init_net
.ipv4
.sysctl_icmp_errors_use_inbound_ifaddr
,
803 .maxlen
= sizeof(int),
805 .proc_handler
= proc_dointvec
808 .procname
= "icmp_ratelimit",
809 .data
= &init_net
.ipv4
.sysctl_icmp_ratelimit
,
810 .maxlen
= sizeof(int),
812 .proc_handler
= proc_dointvec_ms_jiffies
,
815 .procname
= "icmp_ratemask",
816 .data
= &init_net
.ipv4
.sysctl_icmp_ratemask
,
817 .maxlen
= sizeof(int),
819 .proc_handler
= proc_dointvec
822 .procname
= "ping_group_range",
823 .data
= &init_net
.ipv4
.sysctl_ping_group_range
,
824 .maxlen
= sizeof(gid_t
)*2,
826 .proc_handler
= ipv4_ping_group_range
,
829 .procname
= "tcp_ecn",
830 .data
= &init_net
.ipv4
.sysctl_tcp_ecn
,
831 .maxlen
= sizeof(int),
833 .proc_handler
= proc_dointvec
836 .procname
= "tcp_mem",
837 .maxlen
= sizeof(init_net
.ipv4
.sysctl_tcp_mem
),
839 .proc_handler
= ipv4_tcp_mem
,
844 static __net_init
int ipv4_sysctl_init_net(struct net
*net
)
846 struct ctl_table
*table
;
848 table
= ipv4_net_table
;
849 if (!net_eq(net
, &init_net
)) {
850 table
= kmemdup(table
, sizeof(ipv4_net_table
), GFP_KERNEL
);
855 &net
->ipv4
.sysctl_icmp_echo_ignore_all
;
857 &net
->ipv4
.sysctl_icmp_echo_ignore_broadcasts
;
859 &net
->ipv4
.sysctl_icmp_ignore_bogus_error_responses
;
861 &net
->ipv4
.sysctl_icmp_errors_use_inbound_ifaddr
;
863 &net
->ipv4
.sysctl_icmp_ratelimit
;
865 &net
->ipv4
.sysctl_icmp_ratemask
;
867 &net
->ipv4
.sysctl_ping_group_range
;
869 &net
->ipv4
.sysctl_tcp_ecn
;
871 /* Don't export sysctls to unprivileged users */
872 if (net
->user_ns
!= &init_user_ns
)
873 table
[0].procname
= NULL
;
877 * Sane defaults - nobody may create ping sockets.
878 * Boot scripts should set this to distro-specific group.
880 net
->ipv4
.sysctl_ping_group_range
[0] = make_kgid(&init_user_ns
, 1);
881 net
->ipv4
.sysctl_ping_group_range
[1] = make_kgid(&init_user_ns
, 0);
885 net
->ipv4
.ipv4_hdr
= register_net_sysctl(net
, "net/ipv4", table
);
886 if (net
->ipv4
.ipv4_hdr
== NULL
)
892 if (!net_eq(net
, &init_net
))
898 static __net_exit
void ipv4_sysctl_exit_net(struct net
*net
)
900 struct ctl_table
*table
;
902 table
= net
->ipv4
.ipv4_hdr
->ctl_table_arg
;
903 unregister_net_sysctl_table(net
->ipv4
.ipv4_hdr
);
907 static __net_initdata
struct pernet_operations ipv4_sysctl_ops
= {
908 .init
= ipv4_sysctl_init_net
,
909 .exit
= ipv4_sysctl_exit_net
,
912 static __init
int sysctl_ipv4_init(void)
914 struct ctl_table_header
*hdr
;
917 for (i
= ipv4_table
; i
->procname
; i
++) {
918 if (strcmp(i
->procname
, "ip_local_reserved_ports") == 0) {
919 i
->data
= sysctl_local_reserved_ports
;
926 hdr
= register_net_sysctl(&init_net
, "net/ipv4", ipv4_table
);
930 if (register_pernet_subsys(&ipv4_sysctl_ops
)) {
931 unregister_net_sysctl_table(hdr
);
938 __initcall(sysctl_ipv4_init
);