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
};
44 static int min_sndbuf
= SOCK_MIN_SNDBUF
;
45 static int min_rcvbuf
= SOCK_MIN_RCVBUF
;
47 /* Update system visible IP port range */
48 static void set_local_port_range(struct net
*net
, int range
[2])
50 bool same_parity
= !((range
[0] ^ range
[1]) & 1);
52 write_seqlock(&net
->ipv4
.ip_local_ports
.lock
);
53 if (same_parity
&& !net
->ipv4
.ip_local_ports
.warned
) {
54 net
->ipv4
.ip_local_ports
.warned
= true;
55 pr_err_ratelimited("ip_local_port_range: prefer different parity for start/end values.\n");
57 net
->ipv4
.ip_local_ports
.range
[0] = range
[0];
58 net
->ipv4
.ip_local_ports
.range
[1] = range
[1];
59 write_sequnlock(&net
->ipv4
.ip_local_ports
.lock
);
62 /* Validate changes from /proc interface. */
63 static int ipv4_local_port_range(struct ctl_table
*table
, int write
,
65 size_t *lenp
, loff_t
*ppos
)
68 container_of(table
->data
, struct net
, ipv4
.ip_local_ports
.range
);
71 struct ctl_table tmp
= {
73 .maxlen
= sizeof(range
),
75 .extra1
= &ip_local_port_range_min
,
76 .extra2
= &ip_local_port_range_max
,
79 inet_get_local_port_range(net
, &range
[0], &range
[1]);
81 ret
= proc_dointvec_minmax(&tmp
, write
, buffer
, lenp
, ppos
);
83 if (write
&& ret
== 0) {
84 if (range
[1] < range
[0])
87 set_local_port_range(net
, range
);
94 static void inet_get_ping_group_range_table(struct ctl_table
*table
, kgid_t
*low
, kgid_t
*high
)
96 kgid_t
*data
= table
->data
;
98 container_of(table
->data
, struct net
, ipv4
.ping_group_range
.range
);
101 seq
= read_seqbegin(&net
->ipv4
.ip_local_ports
.lock
);
105 } while (read_seqretry(&net
->ipv4
.ip_local_ports
.lock
, seq
));
108 /* Update system visible IP port range */
109 static void set_ping_group_range(struct ctl_table
*table
, kgid_t low
, kgid_t high
)
111 kgid_t
*data
= table
->data
;
113 container_of(table
->data
, struct net
, ipv4
.ping_group_range
.range
);
114 write_seqlock(&net
->ipv4
.ip_local_ports
.lock
);
117 write_sequnlock(&net
->ipv4
.ip_local_ports
.lock
);
120 /* Validate changes from /proc interface. */
121 static int ipv4_ping_group_range(struct ctl_table
*table
, int write
,
123 size_t *lenp
, loff_t
*ppos
)
125 struct user_namespace
*user_ns
= current_user_ns();
129 struct ctl_table tmp
= {
131 .maxlen
= sizeof(urange
),
133 .extra1
= &ip_ping_group_range_min
,
134 .extra2
= &ip_ping_group_range_max
,
137 inet_get_ping_group_range_table(table
, &low
, &high
);
138 urange
[0] = from_kgid_munged(user_ns
, low
);
139 urange
[1] = from_kgid_munged(user_ns
, high
);
140 ret
= proc_dointvec_minmax(&tmp
, write
, buffer
, lenp
, ppos
);
142 if (write
&& ret
== 0) {
143 low
= make_kgid(user_ns
, urange
[0]);
144 high
= make_kgid(user_ns
, urange
[1]);
145 if (!gid_valid(low
) || !gid_valid(high
) ||
146 (urange
[1] < urange
[0]) || gid_lt(high
, low
)) {
147 low
= make_kgid(&init_user_ns
, 1);
148 high
= make_kgid(&init_user_ns
, 0);
150 set_ping_group_range(table
, low
, high
);
156 static int proc_tcp_congestion_control(struct ctl_table
*ctl
, int write
,
157 void __user
*buffer
, size_t *lenp
, loff_t
*ppos
)
159 char val
[TCP_CA_NAME_MAX
];
160 struct ctl_table tbl
= {
162 .maxlen
= TCP_CA_NAME_MAX
,
166 tcp_get_default_congestion_control(val
);
168 ret
= proc_dostring(&tbl
, write
, buffer
, lenp
, ppos
);
169 if (write
&& ret
== 0)
170 ret
= tcp_set_default_congestion_control(val
);
174 static int proc_tcp_available_congestion_control(struct ctl_table
*ctl
,
176 void __user
*buffer
, size_t *lenp
,
179 struct ctl_table tbl
= { .maxlen
= TCP_CA_BUF_MAX
, };
182 tbl
.data
= kmalloc(tbl
.maxlen
, GFP_USER
);
185 tcp_get_available_congestion_control(tbl
.data
, TCP_CA_BUF_MAX
);
186 ret
= proc_dostring(&tbl
, write
, buffer
, lenp
, ppos
);
191 static int proc_allowed_congestion_control(struct ctl_table
*ctl
,
193 void __user
*buffer
, size_t *lenp
,
196 struct ctl_table tbl
= { .maxlen
= TCP_CA_BUF_MAX
};
199 tbl
.data
= kmalloc(tbl
.maxlen
, GFP_USER
);
203 tcp_get_allowed_congestion_control(tbl
.data
, tbl
.maxlen
);
204 ret
= proc_dostring(&tbl
, write
, buffer
, lenp
, ppos
);
205 if (write
&& ret
== 0)
206 ret
= tcp_set_allowed_congestion_control(tbl
.data
);
211 static int proc_tcp_fastopen_key(struct ctl_table
*ctl
, int write
,
212 void __user
*buffer
, size_t *lenp
,
215 struct ctl_table tbl
= { .maxlen
= (TCP_FASTOPEN_KEY_LENGTH
* 2 + 10) };
216 struct tcp_fastopen_context
*ctxt
;
218 u32 user_key
[4]; /* 16 bytes, matching TCP_FASTOPEN_KEY_LENGTH */
220 tbl
.data
= kmalloc(tbl
.maxlen
, GFP_KERNEL
);
225 ctxt
= rcu_dereference(tcp_fastopen_ctx
);
227 memcpy(user_key
, ctxt
->key
, TCP_FASTOPEN_KEY_LENGTH
);
229 memset(user_key
, 0, sizeof(user_key
));
232 snprintf(tbl
.data
, tbl
.maxlen
, "%08x-%08x-%08x-%08x",
233 user_key
[0], user_key
[1], user_key
[2], user_key
[3]);
234 ret
= proc_dostring(&tbl
, write
, buffer
, lenp
, ppos
);
236 if (write
&& ret
== 0) {
237 if (sscanf(tbl
.data
, "%x-%x-%x-%x", user_key
, user_key
+ 1,
238 user_key
+ 2, user_key
+ 3) != 4) {
242 /* Generate a dummy secret but don't publish it. This
243 * is needed so we don't regenerate a new key on the
244 * first invocation of tcp_fastopen_cookie_gen
246 tcp_fastopen_init_key_once(false);
247 tcp_fastopen_reset_cipher(user_key
, TCP_FASTOPEN_KEY_LENGTH
);
251 pr_debug("proc FO key set 0x%x-%x-%x-%x <- 0x%s: %u\n",
252 user_key
[0], user_key
[1], user_key
[2], user_key
[3],
253 (char *)tbl
.data
, ret
);
258 static struct ctl_table ipv4_table
[] = {
260 .procname
= "tcp_timestamps",
261 .data
= &sysctl_tcp_timestamps
,
262 .maxlen
= sizeof(int),
264 .proc_handler
= proc_dointvec
267 .procname
= "tcp_window_scaling",
268 .data
= &sysctl_tcp_window_scaling
,
269 .maxlen
= sizeof(int),
271 .proc_handler
= proc_dointvec
274 .procname
= "tcp_sack",
275 .data
= &sysctl_tcp_sack
,
276 .maxlen
= sizeof(int),
278 .proc_handler
= proc_dointvec
281 .procname
= "tcp_retrans_collapse",
282 .data
= &sysctl_tcp_retrans_collapse
,
283 .maxlen
= sizeof(int),
285 .proc_handler
= proc_dointvec
288 .procname
= "ip_default_ttl",
289 .data
= &sysctl_ip_default_ttl
,
290 .maxlen
= sizeof(int),
292 .proc_handler
= proc_dointvec_minmax
,
293 .extra1
= &ip_ttl_min
,
294 .extra2
= &ip_ttl_max
,
297 .procname
= "tcp_syn_retries",
298 .data
= &sysctl_tcp_syn_retries
,
299 .maxlen
= sizeof(int),
301 .proc_handler
= proc_dointvec_minmax
,
302 .extra1
= &tcp_syn_retries_min
,
303 .extra2
= &tcp_syn_retries_max
306 .procname
= "tcp_synack_retries",
307 .data
= &sysctl_tcp_synack_retries
,
308 .maxlen
= sizeof(int),
310 .proc_handler
= proc_dointvec
313 .procname
= "tcp_max_orphans",
314 .data
= &sysctl_tcp_max_orphans
,
315 .maxlen
= sizeof(int),
317 .proc_handler
= proc_dointvec
320 .procname
= "tcp_max_tw_buckets",
321 .data
= &tcp_death_row
.sysctl_max_tw_buckets
,
322 .maxlen
= sizeof(int),
324 .proc_handler
= proc_dointvec
327 .procname
= "ip_early_demux",
328 .data
= &sysctl_ip_early_demux
,
329 .maxlen
= sizeof(int),
331 .proc_handler
= proc_dointvec
334 .procname
= "ip_dynaddr",
335 .data
= &sysctl_ip_dynaddr
,
336 .maxlen
= sizeof(int),
338 .proc_handler
= proc_dointvec
341 .procname
= "tcp_keepalive_time",
342 .data
= &sysctl_tcp_keepalive_time
,
343 .maxlen
= sizeof(int),
345 .proc_handler
= proc_dointvec_jiffies
,
348 .procname
= "tcp_keepalive_probes",
349 .data
= &sysctl_tcp_keepalive_probes
,
350 .maxlen
= sizeof(int),
352 .proc_handler
= proc_dointvec
355 .procname
= "tcp_keepalive_intvl",
356 .data
= &sysctl_tcp_keepalive_intvl
,
357 .maxlen
= sizeof(int),
359 .proc_handler
= proc_dointvec_jiffies
,
362 .procname
= "tcp_retries1",
363 .data
= &sysctl_tcp_retries1
,
364 .maxlen
= sizeof(int),
366 .proc_handler
= proc_dointvec_minmax
,
367 .extra2
= &tcp_retr1_max
370 .procname
= "tcp_retries2",
371 .data
= &sysctl_tcp_retries2
,
372 .maxlen
= sizeof(int),
374 .proc_handler
= proc_dointvec
377 .procname
= "tcp_fin_timeout",
378 .data
= &sysctl_tcp_fin_timeout
,
379 .maxlen
= sizeof(int),
381 .proc_handler
= proc_dointvec_jiffies
,
383 #ifdef CONFIG_SYN_COOKIES
385 .procname
= "tcp_syncookies",
386 .data
= &sysctl_tcp_syncookies
,
387 .maxlen
= sizeof(int),
389 .proc_handler
= proc_dointvec
393 .procname
= "tcp_fastopen",
394 .data
= &sysctl_tcp_fastopen
,
395 .maxlen
= sizeof(int),
397 .proc_handler
= proc_dointvec
,
400 .procname
= "tcp_fastopen_key",
402 .maxlen
= ((TCP_FASTOPEN_KEY_LENGTH
* 2) + 10),
403 .proc_handler
= proc_tcp_fastopen_key
,
406 .procname
= "tcp_tw_recycle",
407 .data
= &tcp_death_row
.sysctl_tw_recycle
,
408 .maxlen
= sizeof(int),
410 .proc_handler
= proc_dointvec
413 .procname
= "tcp_abort_on_overflow",
414 .data
= &sysctl_tcp_abort_on_overflow
,
415 .maxlen
= sizeof(int),
417 .proc_handler
= proc_dointvec
420 .procname
= "tcp_stdurg",
421 .data
= &sysctl_tcp_stdurg
,
422 .maxlen
= sizeof(int),
424 .proc_handler
= proc_dointvec
427 .procname
= "tcp_rfc1337",
428 .data
= &sysctl_tcp_rfc1337
,
429 .maxlen
= sizeof(int),
431 .proc_handler
= proc_dointvec
434 .procname
= "tcp_max_syn_backlog",
435 .data
= &sysctl_max_syn_backlog
,
436 .maxlen
= sizeof(int),
438 .proc_handler
= proc_dointvec
441 .procname
= "igmp_max_memberships",
442 .data
= &sysctl_igmp_max_memberships
,
443 .maxlen
= sizeof(int),
445 .proc_handler
= proc_dointvec
448 .procname
= "igmp_max_msf",
449 .data
= &sysctl_igmp_max_msf
,
450 .maxlen
= sizeof(int),
452 .proc_handler
= proc_dointvec
454 #ifdef CONFIG_IP_MULTICAST
456 .procname
= "igmp_qrv",
457 .data
= &sysctl_igmp_qrv
,
458 .maxlen
= sizeof(int),
460 .proc_handler
= proc_dointvec_minmax
,
465 .procname
= "inet_peer_threshold",
466 .data
= &inet_peer_threshold
,
467 .maxlen
= sizeof(int),
469 .proc_handler
= proc_dointvec
472 .procname
= "inet_peer_minttl",
473 .data
= &inet_peer_minttl
,
474 .maxlen
= sizeof(int),
476 .proc_handler
= proc_dointvec_jiffies
,
479 .procname
= "inet_peer_maxttl",
480 .data
= &inet_peer_maxttl
,
481 .maxlen
= sizeof(int),
483 .proc_handler
= proc_dointvec_jiffies
,
486 .procname
= "tcp_orphan_retries",
487 .data
= &sysctl_tcp_orphan_retries
,
488 .maxlen
= sizeof(int),
490 .proc_handler
= proc_dointvec
493 .procname
= "tcp_fack",
494 .data
= &sysctl_tcp_fack
,
495 .maxlen
= sizeof(int),
497 .proc_handler
= proc_dointvec
500 .procname
= "tcp_reordering",
501 .data
= &sysctl_tcp_reordering
,
502 .maxlen
= sizeof(int),
504 .proc_handler
= proc_dointvec
507 .procname
= "tcp_max_reordering",
508 .data
= &sysctl_tcp_max_reordering
,
509 .maxlen
= sizeof(int),
511 .proc_handler
= proc_dointvec
514 .procname
= "tcp_dsack",
515 .data
= &sysctl_tcp_dsack
,
516 .maxlen
= sizeof(int),
518 .proc_handler
= proc_dointvec
521 .procname
= "tcp_mem",
522 .maxlen
= sizeof(sysctl_tcp_mem
),
523 .data
= &sysctl_tcp_mem
,
525 .proc_handler
= proc_doulongvec_minmax
,
528 .procname
= "tcp_wmem",
529 .data
= &sysctl_tcp_wmem
,
530 .maxlen
= sizeof(sysctl_tcp_wmem
),
532 .proc_handler
= proc_dointvec_minmax
,
533 .extra1
= &min_sndbuf
,
536 .procname
= "tcp_notsent_lowat",
537 .data
= &sysctl_tcp_notsent_lowat
,
538 .maxlen
= sizeof(sysctl_tcp_notsent_lowat
),
540 .proc_handler
= proc_dointvec
,
543 .procname
= "tcp_rmem",
544 .data
= &sysctl_tcp_rmem
,
545 .maxlen
= sizeof(sysctl_tcp_rmem
),
547 .proc_handler
= proc_dointvec_minmax
,
548 .extra1
= &min_rcvbuf
,
551 .procname
= "tcp_app_win",
552 .data
= &sysctl_tcp_app_win
,
553 .maxlen
= sizeof(int),
555 .proc_handler
= proc_dointvec
558 .procname
= "tcp_adv_win_scale",
559 .data
= &sysctl_tcp_adv_win_scale
,
560 .maxlen
= sizeof(int),
562 .proc_handler
= proc_dointvec_minmax
,
563 .extra1
= &tcp_adv_win_scale_min
,
564 .extra2
= &tcp_adv_win_scale_max
,
567 .procname
= "tcp_tw_reuse",
568 .data
= &sysctl_tcp_tw_reuse
,
569 .maxlen
= sizeof(int),
571 .proc_handler
= proc_dointvec
574 .procname
= "tcp_frto",
575 .data
= &sysctl_tcp_frto
,
576 .maxlen
= sizeof(int),
578 .proc_handler
= proc_dointvec
581 .procname
= "tcp_low_latency",
582 .data
= &sysctl_tcp_low_latency
,
583 .maxlen
= sizeof(int),
585 .proc_handler
= proc_dointvec
588 .procname
= "tcp_no_metrics_save",
589 .data
= &sysctl_tcp_nometrics_save
,
590 .maxlen
= sizeof(int),
592 .proc_handler
= proc_dointvec
,
595 .procname
= "tcp_moderate_rcvbuf",
596 .data
= &sysctl_tcp_moderate_rcvbuf
,
597 .maxlen
= sizeof(int),
599 .proc_handler
= proc_dointvec
,
602 .procname
= "tcp_tso_win_divisor",
603 .data
= &sysctl_tcp_tso_win_divisor
,
604 .maxlen
= sizeof(int),
606 .proc_handler
= proc_dointvec
,
609 .procname
= "tcp_congestion_control",
611 .maxlen
= TCP_CA_NAME_MAX
,
612 .proc_handler
= proc_tcp_congestion_control
,
615 .procname
= "tcp_workaround_signed_windows",
616 .data
= &sysctl_tcp_workaround_signed_windows
,
617 .maxlen
= sizeof(int),
619 .proc_handler
= proc_dointvec
622 .procname
= "tcp_limit_output_bytes",
623 .data
= &sysctl_tcp_limit_output_bytes
,
624 .maxlen
= sizeof(int),
626 .proc_handler
= proc_dointvec
629 .procname
= "tcp_challenge_ack_limit",
630 .data
= &sysctl_tcp_challenge_ack_limit
,
631 .maxlen
= sizeof(int),
633 .proc_handler
= proc_dointvec
636 .procname
= "tcp_slow_start_after_idle",
637 .data
= &sysctl_tcp_slow_start_after_idle
,
638 .maxlen
= sizeof(int),
640 .proc_handler
= proc_dointvec
642 #ifdef CONFIG_NETLABEL
644 .procname
= "cipso_cache_enable",
645 .data
= &cipso_v4_cache_enabled
,
646 .maxlen
= sizeof(int),
648 .proc_handler
= proc_dointvec
,
651 .procname
= "cipso_cache_bucket_size",
652 .data
= &cipso_v4_cache_bucketsize
,
653 .maxlen
= sizeof(int),
655 .proc_handler
= proc_dointvec
,
658 .procname
= "cipso_rbm_optfmt",
659 .data
= &cipso_v4_rbm_optfmt
,
660 .maxlen
= sizeof(int),
662 .proc_handler
= proc_dointvec
,
665 .procname
= "cipso_rbm_strictvalid",
666 .data
= &cipso_v4_rbm_strictvalid
,
667 .maxlen
= sizeof(int),
669 .proc_handler
= proc_dointvec
,
671 #endif /* CONFIG_NETLABEL */
673 .procname
= "tcp_available_congestion_control",
674 .maxlen
= TCP_CA_BUF_MAX
,
676 .proc_handler
= proc_tcp_available_congestion_control
,
679 .procname
= "tcp_allowed_congestion_control",
680 .maxlen
= TCP_CA_BUF_MAX
,
682 .proc_handler
= proc_allowed_congestion_control
,
685 .procname
= "tcp_thin_linear_timeouts",
686 .data
= &sysctl_tcp_thin_linear_timeouts
,
687 .maxlen
= sizeof(int),
689 .proc_handler
= proc_dointvec
692 .procname
= "tcp_thin_dupack",
693 .data
= &sysctl_tcp_thin_dupack
,
694 .maxlen
= sizeof(int),
696 .proc_handler
= proc_dointvec
699 .procname
= "tcp_early_retrans",
700 .data
= &sysctl_tcp_early_retrans
,
701 .maxlen
= sizeof(int),
703 .proc_handler
= proc_dointvec_minmax
,
708 .procname
= "tcp_min_tso_segs",
709 .data
= &sysctl_tcp_min_tso_segs
,
710 .maxlen
= sizeof(int),
712 .proc_handler
= proc_dointvec_minmax
,
714 .extra2
= &gso_max_segs
,
717 .procname
= "tcp_autocorking",
718 .data
= &sysctl_tcp_autocorking
,
719 .maxlen
= sizeof(int),
721 .proc_handler
= proc_dointvec_minmax
,
726 .procname
= "tcp_invalid_ratelimit",
727 .data
= &sysctl_tcp_invalid_ratelimit
,
728 .maxlen
= sizeof(int),
730 .proc_handler
= proc_dointvec_ms_jiffies
,
733 .procname
= "icmp_msgs_per_sec",
734 .data
= &sysctl_icmp_msgs_per_sec
,
735 .maxlen
= sizeof(int),
737 .proc_handler
= proc_dointvec_minmax
,
741 .procname
= "icmp_msgs_burst",
742 .data
= &sysctl_icmp_msgs_burst
,
743 .maxlen
= sizeof(int),
745 .proc_handler
= proc_dointvec_minmax
,
749 .procname
= "udp_mem",
750 .data
= &sysctl_udp_mem
,
751 .maxlen
= sizeof(sysctl_udp_mem
),
753 .proc_handler
= proc_doulongvec_minmax
,
756 .procname
= "udp_rmem_min",
757 .data
= &sysctl_udp_rmem_min
,
758 .maxlen
= sizeof(sysctl_udp_rmem_min
),
760 .proc_handler
= proc_dointvec_minmax
,
761 .extra1
= &min_rcvbuf
,
764 .procname
= "udp_wmem_min",
765 .data
= &sysctl_udp_wmem_min
,
766 .maxlen
= sizeof(sysctl_udp_wmem_min
),
768 .proc_handler
= proc_dointvec_minmax
,
769 .extra1
= &min_sndbuf
,
774 static struct ctl_table ipv4_net_table
[] = {
776 .procname
= "icmp_echo_ignore_all",
777 .data
= &init_net
.ipv4
.sysctl_icmp_echo_ignore_all
,
778 .maxlen
= sizeof(int),
780 .proc_handler
= proc_dointvec
783 .procname
= "icmp_echo_ignore_broadcasts",
784 .data
= &init_net
.ipv4
.sysctl_icmp_echo_ignore_broadcasts
,
785 .maxlen
= sizeof(int),
787 .proc_handler
= proc_dointvec
790 .procname
= "icmp_ignore_bogus_error_responses",
791 .data
= &init_net
.ipv4
.sysctl_icmp_ignore_bogus_error_responses
,
792 .maxlen
= sizeof(int),
794 .proc_handler
= proc_dointvec
797 .procname
= "icmp_errors_use_inbound_ifaddr",
798 .data
= &init_net
.ipv4
.sysctl_icmp_errors_use_inbound_ifaddr
,
799 .maxlen
= sizeof(int),
801 .proc_handler
= proc_dointvec
804 .procname
= "icmp_ratelimit",
805 .data
= &init_net
.ipv4
.sysctl_icmp_ratelimit
,
806 .maxlen
= sizeof(int),
808 .proc_handler
= proc_dointvec_ms_jiffies
,
811 .procname
= "icmp_ratemask",
812 .data
= &init_net
.ipv4
.sysctl_icmp_ratemask
,
813 .maxlen
= sizeof(int),
815 .proc_handler
= proc_dointvec
818 .procname
= "ping_group_range",
819 .data
= &init_net
.ipv4
.ping_group_range
.range
,
820 .maxlen
= sizeof(gid_t
)*2,
822 .proc_handler
= ipv4_ping_group_range
,
825 .procname
= "tcp_ecn",
826 .data
= &init_net
.ipv4
.sysctl_tcp_ecn
,
827 .maxlen
= sizeof(int),
829 .proc_handler
= proc_dointvec
832 .procname
= "tcp_ecn_fallback",
833 .data
= &init_net
.ipv4
.sysctl_tcp_ecn_fallback
,
834 .maxlen
= sizeof(int),
836 .proc_handler
= proc_dointvec
839 .procname
= "ip_local_port_range",
840 .maxlen
= sizeof(init_net
.ipv4
.ip_local_ports
.range
),
841 .data
= &init_net
.ipv4
.ip_local_ports
.range
,
843 .proc_handler
= ipv4_local_port_range
,
846 .procname
= "ip_local_reserved_ports",
847 .data
= &init_net
.ipv4
.sysctl_local_reserved_ports
,
850 .proc_handler
= proc_do_large_bitmap
,
853 .procname
= "ip_no_pmtu_disc",
854 .data
= &init_net
.ipv4
.sysctl_ip_no_pmtu_disc
,
855 .maxlen
= sizeof(int),
857 .proc_handler
= proc_dointvec
860 .procname
= "ip_forward_use_pmtu",
861 .data
= &init_net
.ipv4
.sysctl_ip_fwd_use_pmtu
,
862 .maxlen
= sizeof(int),
864 .proc_handler
= proc_dointvec
,
867 .procname
= "ip_nonlocal_bind",
868 .data
= &init_net
.ipv4
.sysctl_ip_nonlocal_bind
,
869 .maxlen
= sizeof(int),
871 .proc_handler
= proc_dointvec
874 .procname
= "fwmark_reflect",
875 .data
= &init_net
.ipv4
.sysctl_fwmark_reflect
,
876 .maxlen
= sizeof(int),
878 .proc_handler
= proc_dointvec
,
881 .procname
= "tcp_fwmark_accept",
882 .data
= &init_net
.ipv4
.sysctl_tcp_fwmark_accept
,
883 .maxlen
= sizeof(int),
885 .proc_handler
= proc_dointvec
,
888 .procname
= "tcp_mtu_probing",
889 .data
= &init_net
.ipv4
.sysctl_tcp_mtu_probing
,
890 .maxlen
= sizeof(int),
892 .proc_handler
= proc_dointvec
,
895 .procname
= "tcp_base_mss",
896 .data
= &init_net
.ipv4
.sysctl_tcp_base_mss
,
897 .maxlen
= sizeof(int),
899 .proc_handler
= proc_dointvec
,
902 .procname
= "tcp_probe_threshold",
903 .data
= &init_net
.ipv4
.sysctl_tcp_probe_threshold
,
904 .maxlen
= sizeof(int),
906 .proc_handler
= proc_dointvec
,
909 .procname
= "tcp_probe_interval",
910 .data
= &init_net
.ipv4
.sysctl_tcp_probe_interval
,
911 .maxlen
= sizeof(int),
913 .proc_handler
= proc_dointvec
,
918 static __net_init
int ipv4_sysctl_init_net(struct net
*net
)
920 struct ctl_table
*table
;
922 table
= ipv4_net_table
;
923 if (!net_eq(net
, &init_net
)) {
926 table
= kmemdup(table
, sizeof(ipv4_net_table
), GFP_KERNEL
);
930 /* Update the variables to point into the current struct net */
931 for (i
= 0; i
< ARRAY_SIZE(ipv4_net_table
) - 1; i
++)
932 table
[i
].data
+= (void *)net
- (void *)&init_net
;
935 net
->ipv4
.ipv4_hdr
= register_net_sysctl(net
, "net/ipv4", table
);
936 if (!net
->ipv4
.ipv4_hdr
)
939 net
->ipv4
.sysctl_local_reserved_ports
= kzalloc(65536 / 8, GFP_KERNEL
);
940 if (!net
->ipv4
.sysctl_local_reserved_ports
)
946 unregister_net_sysctl_table(net
->ipv4
.ipv4_hdr
);
948 if (!net_eq(net
, &init_net
))
954 static __net_exit
void ipv4_sysctl_exit_net(struct net
*net
)
956 struct ctl_table
*table
;
958 kfree(net
->ipv4
.sysctl_local_reserved_ports
);
959 table
= net
->ipv4
.ipv4_hdr
->ctl_table_arg
;
960 unregister_net_sysctl_table(net
->ipv4
.ipv4_hdr
);
964 static __net_initdata
struct pernet_operations ipv4_sysctl_ops
= {
965 .init
= ipv4_sysctl_init_net
,
966 .exit
= ipv4_sysctl_exit_net
,
969 static __init
int sysctl_ipv4_init(void)
971 struct ctl_table_header
*hdr
;
973 hdr
= register_net_sysctl(&init_net
, "net/ipv4", ipv4_table
);
977 if (register_pernet_subsys(&ipv4_sysctl_ops
)) {
978 unregister_net_sysctl_table(hdr
);
985 __initcall(sysctl_ipv4_init
);