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);