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 thousand = 1000;
33 static int gso_max_segs = GSO_MAX_SEGS;
34 static int tcp_retr1_max = 255;
35 static int ip_local_port_range_min[] = { 1, 1 };
36 static int ip_local_port_range_max[] = { 65535, 65535 };
37 static int tcp_adv_win_scale_min = -31;
38 static int tcp_adv_win_scale_max = 31;
39 static int ip_ttl_min = 1;
40 static int ip_ttl_max = 255;
41 static int tcp_syn_retries_min = 1;
42 static int tcp_syn_retries_max = MAX_TCP_SYNCNT;
43 static int ip_ping_group_range_min[] = { 0, 0 };
44 static int ip_ping_group_range_max[] = { GID_T_MAX, GID_T_MAX };
46 /* Update system visible IP port range */
47 static void set_local_port_range(struct net *net, int range[2])
49 bool same_parity = !((range[0] ^ range[1]) & 1);
51 write_seqlock_bh(&net->ipv4.ip_local_ports.lock);
52 if (same_parity && !net->ipv4.ip_local_ports.warned) {
53 net->ipv4.ip_local_ports.warned = true;
54 pr_err_ratelimited("ip_local_port_range: prefer different parity for start/end values.\n");
56 net->ipv4.ip_local_ports.range[0] = range[0];
57 net->ipv4.ip_local_ports.range[1] = range[1];
58 write_sequnlock_bh(&net->ipv4.ip_local_ports.lock);
61 /* Validate changes from /proc interface. */
62 static int ipv4_local_port_range(struct ctl_table *table, int write,
64 size_t *lenp, loff_t *ppos)
67 container_of(table->data, struct net, ipv4.ip_local_ports.range);
70 struct ctl_table tmp = {
72 .maxlen = sizeof(range),
74 .extra1 = &ip_local_port_range_min,
75 .extra2 = &ip_local_port_range_max,
78 inet_get_local_port_range(net, &range[0], &range[1]);
80 ret = proc_dointvec_minmax(&tmp, write, buffer, lenp, ppos);
82 if (write && ret == 0) {
83 if (range[1] < range[0])
86 set_local_port_range(net, range);
93 static void inet_get_ping_group_range_table(struct ctl_table *table, kgid_t *low, kgid_t *high)
95 kgid_t *data = table->data;
97 container_of(table->data, struct net, ipv4.ping_group_range.range);
100 seq = read_seqbegin(&net->ipv4.ip_local_ports.lock);
104 } while (read_seqretry(&net->ipv4.ip_local_ports.lock, seq));
107 /* Update system visible IP port range */
108 static void set_ping_group_range(struct ctl_table *table, kgid_t low, kgid_t high)
110 kgid_t *data = table->data;
112 container_of(table->data, struct net, ipv4.ping_group_range.range);
113 write_seqlock(&net->ipv4.ip_local_ports.lock);
116 write_sequnlock(&net->ipv4.ip_local_ports.lock);
119 /* Validate changes from /proc interface. */
120 static int ipv4_ping_group_range(struct ctl_table *table, int write,
122 size_t *lenp, loff_t *ppos)
124 struct user_namespace *user_ns = current_user_ns();
128 struct ctl_table tmp = {
130 .maxlen = sizeof(urange),
132 .extra1 = &ip_ping_group_range_min,
133 .extra2 = &ip_ping_group_range_max,
136 inet_get_ping_group_range_table(table, &low, &high);
137 urange[0] = from_kgid_munged(user_ns, low);
138 urange[1] = from_kgid_munged(user_ns, high);
139 ret = proc_dointvec_minmax(&tmp, write, buffer, lenp, ppos);
141 if (write && ret == 0) {
142 low = make_kgid(user_ns, urange[0]);
143 high = make_kgid(user_ns, urange[1]);
144 if (!gid_valid(low) || !gid_valid(high) ||
145 (urange[1] < urange[0]) || gid_lt(high, low)) {
146 low = make_kgid(&init_user_ns, 1);
147 high = make_kgid(&init_user_ns, 0);
149 set_ping_group_range(table, low, high);
155 static int proc_tcp_congestion_control(struct ctl_table *ctl, int write,
156 void __user *buffer, size_t *lenp, loff_t *ppos)
158 char val[TCP_CA_NAME_MAX];
159 struct ctl_table tbl = {
161 .maxlen = TCP_CA_NAME_MAX,
165 tcp_get_default_congestion_control(val);
167 ret = proc_dostring(&tbl, write, buffer, lenp, ppos);
168 if (write && ret == 0)
169 ret = tcp_set_default_congestion_control(val);
173 static int proc_tcp_available_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);
184 tcp_get_available_congestion_control(tbl.data, TCP_CA_BUF_MAX);
185 ret = proc_dostring(&tbl, write, buffer, lenp, ppos);
190 static int proc_allowed_congestion_control(struct ctl_table *ctl,
192 void __user *buffer, size_t *lenp,
195 struct ctl_table tbl = { .maxlen = TCP_CA_BUF_MAX };
198 tbl.data = kmalloc(tbl.maxlen, GFP_USER);
202 tcp_get_allowed_congestion_control(tbl.data, tbl.maxlen);
203 ret = proc_dostring(&tbl, write, buffer, lenp, ppos);
204 if (write && ret == 0)
205 ret = tcp_set_allowed_congestion_control(tbl.data);
210 static int proc_tcp_fastopen_key(struct ctl_table *ctl, int write,
211 void __user *buffer, size_t *lenp,
214 struct ctl_table tbl = { .maxlen = (TCP_FASTOPEN_KEY_LENGTH * 2 + 10) };
215 struct tcp_fastopen_context *ctxt;
217 u32 user_key[4]; /* 16 bytes, matching TCP_FASTOPEN_KEY_LENGTH */
219 tbl.data = kmalloc(tbl.maxlen, GFP_KERNEL);
224 ctxt = rcu_dereference(tcp_fastopen_ctx);
226 memcpy(user_key, ctxt->key, TCP_FASTOPEN_KEY_LENGTH);
228 memset(user_key, 0, sizeof(user_key));
231 snprintf(tbl.data, tbl.maxlen, "%08x-%08x-%08x-%08x",
232 user_key[0], user_key[1], user_key[2], user_key[3]);
233 ret = proc_dostring(&tbl, write, buffer, lenp, ppos);
235 if (write && ret == 0) {
236 if (sscanf(tbl.data, "%x-%x-%x-%x", user_key, user_key + 1,
237 user_key + 2, user_key + 3) != 4) {
241 /* Generate a dummy secret but don't publish it. This
242 * is needed so we don't regenerate a new key on the
243 * first invocation of tcp_fastopen_cookie_gen
245 tcp_fastopen_init_key_once(false);
246 tcp_fastopen_reset_cipher(user_key, TCP_FASTOPEN_KEY_LENGTH);
250 pr_debug("proc FO key set 0x%x-%x-%x-%x <- 0x%s: %u\n",
251 user_key[0], user_key[1], user_key[2], user_key[3],
252 (char *)tbl.data, ret);
257 static struct ctl_table ipv4_table[] = {
259 .procname = "tcp_timestamps",
260 .data = &sysctl_tcp_timestamps,
261 .maxlen = sizeof(int),
263 .proc_handler = proc_dointvec
266 .procname = "tcp_window_scaling",
267 .data = &sysctl_tcp_window_scaling,
268 .maxlen = sizeof(int),
270 .proc_handler = proc_dointvec
273 .procname = "tcp_sack",
274 .data = &sysctl_tcp_sack,
275 .maxlen = sizeof(int),
277 .proc_handler = proc_dointvec
280 .procname = "tcp_retrans_collapse",
281 .data = &sysctl_tcp_retrans_collapse,
282 .maxlen = sizeof(int),
284 .proc_handler = proc_dointvec
287 .procname = "ip_default_ttl",
288 .data = &sysctl_ip_default_ttl,
289 .maxlen = sizeof(int),
291 .proc_handler = proc_dointvec_minmax,
292 .extra1 = &ip_ttl_min,
293 .extra2 = &ip_ttl_max,
296 .procname = "tcp_syn_retries",
297 .data = &sysctl_tcp_syn_retries,
298 .maxlen = sizeof(int),
300 .proc_handler = proc_dointvec_minmax,
301 .extra1 = &tcp_syn_retries_min,
302 .extra2 = &tcp_syn_retries_max
305 .procname = "tcp_synack_retries",
306 .data = &sysctl_tcp_synack_retries,
307 .maxlen = sizeof(int),
309 .proc_handler = proc_dointvec
312 .procname = "tcp_max_orphans",
313 .data = &sysctl_tcp_max_orphans,
314 .maxlen = sizeof(int),
316 .proc_handler = proc_dointvec
319 .procname = "tcp_max_tw_buckets",
320 .data = &tcp_death_row.sysctl_max_tw_buckets,
321 .maxlen = sizeof(int),
323 .proc_handler = proc_dointvec
326 .procname = "ip_early_demux",
327 .data = &sysctl_ip_early_demux,
328 .maxlen = sizeof(int),
330 .proc_handler = proc_dointvec
333 .procname = "ip_dynaddr",
334 .data = &sysctl_ip_dynaddr,
335 .maxlen = sizeof(int),
337 .proc_handler = proc_dointvec
340 .procname = "tcp_retries1",
341 .data = &sysctl_tcp_retries1,
342 .maxlen = sizeof(int),
344 .proc_handler = proc_dointvec_minmax,
345 .extra2 = &tcp_retr1_max
348 .procname = "tcp_retries2",
349 .data = &sysctl_tcp_retries2,
350 .maxlen = sizeof(int),
352 .proc_handler = proc_dointvec
355 .procname = "tcp_fin_timeout",
356 .data = &sysctl_tcp_fin_timeout,
357 .maxlen = sizeof(int),
359 .proc_handler = proc_dointvec_jiffies,
361 #ifdef CONFIG_SYN_COOKIES
363 .procname = "tcp_syncookies",
364 .data = &sysctl_tcp_syncookies,
365 .maxlen = sizeof(int),
367 .proc_handler = proc_dointvec
371 .procname = "tcp_fastopen",
372 .data = &sysctl_tcp_fastopen,
373 .maxlen = sizeof(int),
375 .proc_handler = proc_dointvec,
378 .procname = "tcp_fastopen_key",
380 .maxlen = ((TCP_FASTOPEN_KEY_LENGTH * 2) + 10),
381 .proc_handler = proc_tcp_fastopen_key,
384 .procname = "tcp_tw_recycle",
385 .data = &tcp_death_row.sysctl_tw_recycle,
386 .maxlen = sizeof(int),
388 .proc_handler = proc_dointvec
391 .procname = "tcp_abort_on_overflow",
392 .data = &sysctl_tcp_abort_on_overflow,
393 .maxlen = sizeof(int),
395 .proc_handler = proc_dointvec
398 .procname = "tcp_stdurg",
399 .data = &sysctl_tcp_stdurg,
400 .maxlen = sizeof(int),
402 .proc_handler = proc_dointvec
405 .procname = "tcp_rfc1337",
406 .data = &sysctl_tcp_rfc1337,
407 .maxlen = sizeof(int),
409 .proc_handler = proc_dointvec
412 .procname = "tcp_max_syn_backlog",
413 .data = &sysctl_max_syn_backlog,
414 .maxlen = sizeof(int),
416 .proc_handler = proc_dointvec
419 .procname = "igmp_max_memberships",
420 .data = &sysctl_igmp_max_memberships,
421 .maxlen = sizeof(int),
423 .proc_handler = proc_dointvec
426 .procname = "igmp_max_msf",
427 .data = &sysctl_igmp_max_msf,
428 .maxlen = sizeof(int),
430 .proc_handler = proc_dointvec
432 #ifdef CONFIG_IP_MULTICAST
434 .procname = "igmp_qrv",
435 .data = &sysctl_igmp_qrv,
436 .maxlen = sizeof(int),
438 .proc_handler = proc_dointvec_minmax,
443 .procname = "inet_peer_threshold",
444 .data = &inet_peer_threshold,
445 .maxlen = sizeof(int),
447 .proc_handler = proc_dointvec
450 .procname = "inet_peer_minttl",
451 .data = &inet_peer_minttl,
452 .maxlen = sizeof(int),
454 .proc_handler = proc_dointvec_jiffies,
457 .procname = "inet_peer_maxttl",
458 .data = &inet_peer_maxttl,
459 .maxlen = sizeof(int),
461 .proc_handler = proc_dointvec_jiffies,
464 .procname = "tcp_orphan_retries",
465 .data = &sysctl_tcp_orphan_retries,
466 .maxlen = sizeof(int),
468 .proc_handler = proc_dointvec
471 .procname = "tcp_fack",
472 .data = &sysctl_tcp_fack,
473 .maxlen = sizeof(int),
475 .proc_handler = proc_dointvec
478 .procname = "tcp_recovery",
479 .data = &sysctl_tcp_recovery,
480 .maxlen = sizeof(int),
482 .proc_handler = proc_dointvec,
485 .procname = "tcp_reordering",
486 .data = &sysctl_tcp_reordering,
487 .maxlen = sizeof(int),
489 .proc_handler = proc_dointvec
492 .procname = "tcp_max_reordering",
493 .data = &sysctl_tcp_max_reordering,
494 .maxlen = sizeof(int),
496 .proc_handler = proc_dointvec
499 .procname = "tcp_dsack",
500 .data = &sysctl_tcp_dsack,
501 .maxlen = sizeof(int),
503 .proc_handler = proc_dointvec
506 .procname = "tcp_mem",
507 .maxlen = sizeof(sysctl_tcp_mem),
508 .data = &sysctl_tcp_mem,
510 .proc_handler = proc_doulongvec_minmax,
513 .procname = "tcp_wmem",
514 .data = &sysctl_tcp_wmem,
515 .maxlen = sizeof(sysctl_tcp_wmem),
517 .proc_handler = proc_dointvec_minmax,
521 .procname = "tcp_notsent_lowat",
522 .data = &sysctl_tcp_notsent_lowat,
523 .maxlen = sizeof(sysctl_tcp_notsent_lowat),
525 .proc_handler = proc_dointvec,
528 .procname = "tcp_rmem",
529 .data = &sysctl_tcp_rmem,
530 .maxlen = sizeof(sysctl_tcp_rmem),
532 .proc_handler = proc_dointvec_minmax,
536 .procname = "tcp_app_win",
537 .data = &sysctl_tcp_app_win,
538 .maxlen = sizeof(int),
540 .proc_handler = proc_dointvec
543 .procname = "tcp_adv_win_scale",
544 .data = &sysctl_tcp_adv_win_scale,
545 .maxlen = sizeof(int),
547 .proc_handler = proc_dointvec_minmax,
548 .extra1 = &tcp_adv_win_scale_min,
549 .extra2 = &tcp_adv_win_scale_max,
552 .procname = "tcp_tw_reuse",
553 .data = &sysctl_tcp_tw_reuse,
554 .maxlen = sizeof(int),
556 .proc_handler = proc_dointvec
559 .procname = "tcp_frto",
560 .data = &sysctl_tcp_frto,
561 .maxlen = sizeof(int),
563 .proc_handler = proc_dointvec
566 .procname = "tcp_min_rtt_wlen",
567 .data = &sysctl_tcp_min_rtt_wlen,
568 .maxlen = sizeof(int),
570 .proc_handler = proc_dointvec
573 .procname = "tcp_low_latency",
574 .data = &sysctl_tcp_low_latency,
575 .maxlen = sizeof(int),
577 .proc_handler = proc_dointvec
580 .procname = "tcp_no_metrics_save",
581 .data = &sysctl_tcp_nometrics_save,
582 .maxlen = sizeof(int),
584 .proc_handler = proc_dointvec,
587 .procname = "tcp_moderate_rcvbuf",
588 .data = &sysctl_tcp_moderate_rcvbuf,
589 .maxlen = sizeof(int),
591 .proc_handler = proc_dointvec,
594 .procname = "tcp_tso_win_divisor",
595 .data = &sysctl_tcp_tso_win_divisor,
596 .maxlen = sizeof(int),
598 .proc_handler = proc_dointvec,
601 .procname = "tcp_congestion_control",
603 .maxlen = TCP_CA_NAME_MAX,
604 .proc_handler = proc_tcp_congestion_control,
607 .procname = "tcp_workaround_signed_windows",
608 .data = &sysctl_tcp_workaround_signed_windows,
609 .maxlen = sizeof(int),
611 .proc_handler = proc_dointvec
614 .procname = "tcp_limit_output_bytes",
615 .data = &sysctl_tcp_limit_output_bytes,
616 .maxlen = sizeof(int),
618 .proc_handler = proc_dointvec
621 .procname = "tcp_challenge_ack_limit",
622 .data = &sysctl_tcp_challenge_ack_limit,
623 .maxlen = sizeof(int),
625 .proc_handler = proc_dointvec
628 .procname = "tcp_slow_start_after_idle",
629 .data = &sysctl_tcp_slow_start_after_idle,
630 .maxlen = sizeof(int),
632 .proc_handler = proc_dointvec
634 #ifdef CONFIG_NETLABEL
636 .procname = "cipso_cache_enable",
637 .data = &cipso_v4_cache_enabled,
638 .maxlen = sizeof(int),
640 .proc_handler = proc_dointvec,
643 .procname = "cipso_cache_bucket_size",
644 .data = &cipso_v4_cache_bucketsize,
645 .maxlen = sizeof(int),
647 .proc_handler = proc_dointvec,
650 .procname = "cipso_rbm_optfmt",
651 .data = &cipso_v4_rbm_optfmt,
652 .maxlen = sizeof(int),
654 .proc_handler = proc_dointvec,
657 .procname = "cipso_rbm_strictvalid",
658 .data = &cipso_v4_rbm_strictvalid,
659 .maxlen = sizeof(int),
661 .proc_handler = proc_dointvec,
663 #endif /* CONFIG_NETLABEL */
665 .procname = "tcp_available_congestion_control",
666 .maxlen = TCP_CA_BUF_MAX,
668 .proc_handler = proc_tcp_available_congestion_control,
671 .procname = "tcp_allowed_congestion_control",
672 .maxlen = TCP_CA_BUF_MAX,
674 .proc_handler = proc_allowed_congestion_control,
677 .procname = "tcp_thin_linear_timeouts",
678 .data = &sysctl_tcp_thin_linear_timeouts,
679 .maxlen = sizeof(int),
681 .proc_handler = proc_dointvec
684 .procname = "tcp_thin_dupack",
685 .data = &sysctl_tcp_thin_dupack,
686 .maxlen = sizeof(int),
688 .proc_handler = proc_dointvec
691 .procname = "tcp_early_retrans",
692 .data = &sysctl_tcp_early_retrans,
693 .maxlen = sizeof(int),
695 .proc_handler = proc_dointvec_minmax,
700 .procname = "tcp_min_tso_segs",
701 .data = &sysctl_tcp_min_tso_segs,
702 .maxlen = sizeof(int),
704 .proc_handler = proc_dointvec_minmax,
706 .extra2 = &gso_max_segs,
709 .procname = "tcp_pacing_ss_ratio",
710 .data = &sysctl_tcp_pacing_ss_ratio,
711 .maxlen = sizeof(int),
713 .proc_handler = proc_dointvec_minmax,
718 .procname = "tcp_pacing_ca_ratio",
719 .data = &sysctl_tcp_pacing_ca_ratio,
720 .maxlen = sizeof(int),
722 .proc_handler = proc_dointvec_minmax,
727 .procname = "tcp_autocorking",
728 .data = &sysctl_tcp_autocorking,
729 .maxlen = sizeof(int),
731 .proc_handler = proc_dointvec_minmax,
736 .procname = "tcp_invalid_ratelimit",
737 .data = &sysctl_tcp_invalid_ratelimit,
738 .maxlen = sizeof(int),
740 .proc_handler = proc_dointvec_ms_jiffies,
743 .procname = "icmp_msgs_per_sec",
744 .data = &sysctl_icmp_msgs_per_sec,
745 .maxlen = sizeof(int),
747 .proc_handler = proc_dointvec_minmax,
751 .procname = "icmp_msgs_burst",
752 .data = &sysctl_icmp_msgs_burst,
753 .maxlen = sizeof(int),
755 .proc_handler = proc_dointvec_minmax,
759 .procname = "udp_mem",
760 .data = &sysctl_udp_mem,
761 .maxlen = sizeof(sysctl_udp_mem),
763 .proc_handler = proc_doulongvec_minmax,
766 .procname = "udp_rmem_min",
767 .data = &sysctl_udp_rmem_min,
768 .maxlen = sizeof(sysctl_udp_rmem_min),
770 .proc_handler = proc_dointvec_minmax,
774 .procname = "udp_wmem_min",
775 .data = &sysctl_udp_wmem_min,
776 .maxlen = sizeof(sysctl_udp_wmem_min),
778 .proc_handler = proc_dointvec_minmax,
784 static struct ctl_table ipv4_net_table[] = {
786 .procname = "icmp_echo_ignore_all",
787 .data = &init_net.ipv4.sysctl_icmp_echo_ignore_all,
788 .maxlen = sizeof(int),
790 .proc_handler = proc_dointvec
793 .procname = "icmp_echo_ignore_broadcasts",
794 .data = &init_net.ipv4.sysctl_icmp_echo_ignore_broadcasts,
795 .maxlen = sizeof(int),
797 .proc_handler = proc_dointvec
800 .procname = "icmp_ignore_bogus_error_responses",
801 .data = &init_net.ipv4.sysctl_icmp_ignore_bogus_error_responses,
802 .maxlen = sizeof(int),
804 .proc_handler = proc_dointvec
807 .procname = "icmp_errors_use_inbound_ifaddr",
808 .data = &init_net.ipv4.sysctl_icmp_errors_use_inbound_ifaddr,
809 .maxlen = sizeof(int),
811 .proc_handler = proc_dointvec
814 .procname = "icmp_ratelimit",
815 .data = &init_net.ipv4.sysctl_icmp_ratelimit,
816 .maxlen = sizeof(int),
818 .proc_handler = proc_dointvec_ms_jiffies,
821 .procname = "icmp_ratemask",
822 .data = &init_net.ipv4.sysctl_icmp_ratemask,
823 .maxlen = sizeof(int),
825 .proc_handler = proc_dointvec
828 .procname = "ping_group_range",
829 .data = &init_net.ipv4.ping_group_range.range,
830 .maxlen = sizeof(gid_t)*2,
832 .proc_handler = ipv4_ping_group_range,
835 .procname = "tcp_ecn",
836 .data = &init_net.ipv4.sysctl_tcp_ecn,
837 .maxlen = sizeof(int),
839 .proc_handler = proc_dointvec
842 .procname = "tcp_ecn_fallback",
843 .data = &init_net.ipv4.sysctl_tcp_ecn_fallback,
844 .maxlen = sizeof(int),
846 .proc_handler = proc_dointvec
849 .procname = "ip_local_port_range",
850 .maxlen = sizeof(init_net.ipv4.ip_local_ports.range),
851 .data = &init_net.ipv4.ip_local_ports.range,
853 .proc_handler = ipv4_local_port_range,
856 .procname = "ip_local_reserved_ports",
857 .data = &init_net.ipv4.sysctl_local_reserved_ports,
860 .proc_handler = proc_do_large_bitmap,
863 .procname = "ip_no_pmtu_disc",
864 .data = &init_net.ipv4.sysctl_ip_no_pmtu_disc,
865 .maxlen = sizeof(int),
867 .proc_handler = proc_dointvec
870 .procname = "ip_forward_use_pmtu",
871 .data = &init_net.ipv4.sysctl_ip_fwd_use_pmtu,
872 .maxlen = sizeof(int),
874 .proc_handler = proc_dointvec,
877 .procname = "ip_nonlocal_bind",
878 .data = &init_net.ipv4.sysctl_ip_nonlocal_bind,
879 .maxlen = sizeof(int),
881 .proc_handler = proc_dointvec
884 .procname = "fwmark_reflect",
885 .data = &init_net.ipv4.sysctl_fwmark_reflect,
886 .maxlen = sizeof(int),
888 .proc_handler = proc_dointvec,
891 .procname = "tcp_fwmark_accept",
892 .data = &init_net.ipv4.sysctl_tcp_fwmark_accept,
893 .maxlen = sizeof(int),
895 .proc_handler = proc_dointvec,
897 #ifdef CONFIG_NET_L3_MASTER_DEV
899 .procname = "tcp_l3mdev_accept",
900 .data = &init_net.ipv4.sysctl_tcp_l3mdev_accept,
901 .maxlen = sizeof(int),
903 .proc_handler = proc_dointvec_minmax,
909 .procname = "tcp_mtu_probing",
910 .data = &init_net.ipv4.sysctl_tcp_mtu_probing,
911 .maxlen = sizeof(int),
913 .proc_handler = proc_dointvec,
916 .procname = "tcp_base_mss",
917 .data = &init_net.ipv4.sysctl_tcp_base_mss,
918 .maxlen = sizeof(int),
920 .proc_handler = proc_dointvec,
923 .procname = "tcp_probe_threshold",
924 .data = &init_net.ipv4.sysctl_tcp_probe_threshold,
925 .maxlen = sizeof(int),
927 .proc_handler = proc_dointvec,
930 .procname = "tcp_probe_interval",
931 .data = &init_net.ipv4.sysctl_tcp_probe_interval,
932 .maxlen = sizeof(int),
934 .proc_handler = proc_dointvec,
937 .procname = "igmp_link_local_mcast_reports",
938 .data = &sysctl_igmp_llm_reports,
939 .maxlen = sizeof(int),
941 .proc_handler = proc_dointvec
944 .procname = "tcp_keepalive_time",
945 .data = &init_net.ipv4.sysctl_tcp_keepalive_time,
946 .maxlen = sizeof(int),
948 .proc_handler = proc_dointvec_jiffies,
951 .procname = "tcp_keepalive_probes",
952 .data = &init_net.ipv4.sysctl_tcp_keepalive_probes,
953 .maxlen = sizeof(int),
955 .proc_handler = proc_dointvec
958 .procname = "tcp_keepalive_intvl",
959 .data = &init_net.ipv4.sysctl_tcp_keepalive_intvl,
960 .maxlen = sizeof(int),
962 .proc_handler = proc_dointvec_jiffies,
967 static __net_init int ipv4_sysctl_init_net(struct net *net)
969 struct ctl_table *table;
971 table = ipv4_net_table;
972 if (!net_eq(net, &init_net)) {
975 table = kmemdup(table, sizeof(ipv4_net_table), GFP_KERNEL);
979 /* Update the variables to point into the current struct net */
980 for (i = 0; i < ARRAY_SIZE(ipv4_net_table) - 1; i++)
981 table[i].data += (void *)net - (void *)&init_net;
984 net->ipv4.ipv4_hdr = register_net_sysctl(net, "net/ipv4", table);
985 if (!net->ipv4.ipv4_hdr)
988 net->ipv4.sysctl_local_reserved_ports = kzalloc(65536 / 8, GFP_KERNEL);
989 if (!net->ipv4.sysctl_local_reserved_ports)
995 unregister_net_sysctl_table(net->ipv4.ipv4_hdr);
997 if (!net_eq(net, &init_net))
1003 static __net_exit void ipv4_sysctl_exit_net(struct net *net)
1005 struct ctl_table *table;
1007 kfree(net->ipv4.sysctl_local_reserved_ports);
1008 table = net->ipv4.ipv4_hdr->ctl_table_arg;
1009 unregister_net_sysctl_table(net->ipv4.ipv4_hdr);
1013 static __net_initdata struct pernet_operations ipv4_sysctl_ops = {
1014 .init = ipv4_sysctl_init_net,
1015 .exit = ipv4_sysctl_exit_net,
1018 static __init int sysctl_ipv4_init(void)
1020 struct ctl_table_header *hdr;
1022 hdr = register_net_sysctl(&init_net, "net/ipv4", ipv4_table);
1026 if (register_pernet_subsys(&ipv4_sysctl_ops)) {
1027 unregister_net_sysctl_table(hdr);
1034 __initcall(sysctl_ipv4_init);