2 * sysctl_net_ipv4.c: sysctl interface to net IPV4 subsystem.
4 * $Id: sysctl_net_ipv4.c,v 1.50 2001/10/20 00:00:11 davem Exp $
6 * Begun April 1, 1996, Mike Shaver.
7 * Added /proc/sys/net/ipv4 directory entry (empty =) ). [MS]
11 #include <linux/module.h>
12 #include <linux/sysctl.h>
13 #include <linux/igmp.h>
14 #include <linux/inetdevice.h>
15 #include <linux/seqlock.h>
16 #include <linux/init.h>
20 #include <net/route.h>
22 #include <net/cipso_ipv4.h>
23 #include <net/inet_frag.h>
26 static int tcp_retr1_max = 255;
27 static int ip_local_port_range_min[] = { 1, 1 };
28 static int ip_local_port_range_max[] = { 65535, 65535 };
30 extern seqlock_t sysctl_port_range_lock;
31 extern int sysctl_local_port_range[2];
33 /* Update system visible IP port range */
34 static void set_local_port_range(int range[2])
36 write_seqlock(&sysctl_port_range_lock);
37 sysctl_local_port_range[0] = range[0];
38 sysctl_local_port_range[1] = range[1];
39 write_sequnlock(&sysctl_port_range_lock);
42 /* Validate changes from /proc interface. */
43 static int ipv4_local_port_range(ctl_table *table, int write, struct file *filp,
45 size_t *lenp, loff_t *ppos)
48 int range[2] = { sysctl_local_port_range[0],
49 sysctl_local_port_range[1] };
52 .maxlen = sizeof(range),
54 .extra1 = &ip_local_port_range_min,
55 .extra2 = &ip_local_port_range_max,
58 ret = proc_dointvec_minmax(&tmp, write, filp, buffer, lenp, ppos);
60 if (write && ret == 0) {
61 if (range[1] < range[0])
64 set_local_port_range(range);
70 /* Validate changes from sysctl interface. */
71 static int ipv4_sysctl_local_port_range(ctl_table *table, int __user *name,
72 int nlen, void __user *oldval,
73 size_t __user *oldlenp,
74 void __user *newval, size_t newlen)
77 int range[2] = { sysctl_local_port_range[0],
78 sysctl_local_port_range[1] };
81 .maxlen = sizeof(range),
83 .extra1 = &ip_local_port_range_min,
84 .extra2 = &ip_local_port_range_max,
87 ret = sysctl_intvec(&tmp, name, nlen, oldval, oldlenp, newval, newlen);
88 if (ret == 0 && newval && newlen) {
89 if (range[1] < range[0])
92 set_local_port_range(range);
98 static int proc_tcp_congestion_control(ctl_table *ctl, int write, struct file * filp,
99 void __user *buffer, size_t *lenp, loff_t *ppos)
101 char val[TCP_CA_NAME_MAX];
104 .maxlen = TCP_CA_NAME_MAX,
108 tcp_get_default_congestion_control(val);
110 ret = proc_dostring(&tbl, write, filp, buffer, lenp, ppos);
111 if (write && ret == 0)
112 ret = tcp_set_default_congestion_control(val);
116 static int sysctl_tcp_congestion_control(ctl_table *table, int __user *name,
117 int nlen, void __user *oldval,
118 size_t __user *oldlenp,
119 void __user *newval, size_t newlen)
121 char val[TCP_CA_NAME_MAX];
124 .maxlen = TCP_CA_NAME_MAX,
128 tcp_get_default_congestion_control(val);
129 ret = sysctl_string(&tbl, name, nlen, oldval, oldlenp, newval, newlen);
130 if (ret == 1 && newval && newlen)
131 ret = tcp_set_default_congestion_control(val);
135 static int proc_tcp_available_congestion_control(ctl_table *ctl,
136 int write, struct file * filp,
137 void __user *buffer, size_t *lenp,
140 ctl_table tbl = { .maxlen = TCP_CA_BUF_MAX, };
143 tbl.data = kmalloc(tbl.maxlen, GFP_USER);
146 tcp_get_available_congestion_control(tbl.data, TCP_CA_BUF_MAX);
147 ret = proc_dostring(&tbl, write, filp, buffer, lenp, ppos);
152 static int proc_allowed_congestion_control(ctl_table *ctl,
153 int write, struct file * filp,
154 void __user *buffer, size_t *lenp,
157 ctl_table tbl = { .maxlen = TCP_CA_BUF_MAX };
160 tbl.data = kmalloc(tbl.maxlen, GFP_USER);
164 tcp_get_allowed_congestion_control(tbl.data, tbl.maxlen);
165 ret = proc_dostring(&tbl, write, filp, buffer, lenp, ppos);
166 if (write && ret == 0)
167 ret = tcp_set_allowed_congestion_control(tbl.data);
172 static int strategy_allowed_congestion_control(ctl_table *table, int __user *name,
173 int nlen, void __user *oldval,
174 size_t __user *oldlenp,
178 ctl_table tbl = { .maxlen = TCP_CA_BUF_MAX };
181 tbl.data = kmalloc(tbl.maxlen, GFP_USER);
185 tcp_get_available_congestion_control(tbl.data, tbl.maxlen);
186 ret = sysctl_string(&tbl, name, nlen, oldval, oldlenp, newval, newlen);
187 if (ret == 0 && newval && newlen)
188 ret = tcp_set_allowed_congestion_control(tbl.data);
195 static struct ctl_table ipv4_table[] = {
197 .ctl_name = NET_IPV4_TCP_TIMESTAMPS,
198 .procname = "tcp_timestamps",
199 .data = &sysctl_tcp_timestamps,
200 .maxlen = sizeof(int),
202 .proc_handler = &proc_dointvec
205 .ctl_name = NET_IPV4_TCP_WINDOW_SCALING,
206 .procname = "tcp_window_scaling",
207 .data = &sysctl_tcp_window_scaling,
208 .maxlen = sizeof(int),
210 .proc_handler = &proc_dointvec
213 .ctl_name = NET_IPV4_TCP_SACK,
214 .procname = "tcp_sack",
215 .data = &sysctl_tcp_sack,
216 .maxlen = sizeof(int),
218 .proc_handler = &proc_dointvec
221 .ctl_name = NET_IPV4_TCP_RETRANS_COLLAPSE,
222 .procname = "tcp_retrans_collapse",
223 .data = &sysctl_tcp_retrans_collapse,
224 .maxlen = sizeof(int),
226 .proc_handler = &proc_dointvec
229 .ctl_name = NET_IPV4_DEFAULT_TTL,
230 .procname = "ip_default_ttl",
231 .data = &sysctl_ip_default_ttl,
232 .maxlen = sizeof(int),
234 .proc_handler = &ipv4_doint_and_flush,
235 .strategy = &ipv4_doint_and_flush_strategy,
238 .ctl_name = NET_IPV4_NO_PMTU_DISC,
239 .procname = "ip_no_pmtu_disc",
240 .data = &ipv4_config.no_pmtu_disc,
241 .maxlen = sizeof(int),
243 .proc_handler = &proc_dointvec
246 .ctl_name = NET_IPV4_NONLOCAL_BIND,
247 .procname = "ip_nonlocal_bind",
248 .data = &sysctl_ip_nonlocal_bind,
249 .maxlen = sizeof(int),
251 .proc_handler = &proc_dointvec
254 .ctl_name = NET_IPV4_TCP_SYN_RETRIES,
255 .procname = "tcp_syn_retries",
256 .data = &sysctl_tcp_syn_retries,
257 .maxlen = sizeof(int),
259 .proc_handler = &proc_dointvec
262 .ctl_name = NET_TCP_SYNACK_RETRIES,
263 .procname = "tcp_synack_retries",
264 .data = &sysctl_tcp_synack_retries,
265 .maxlen = sizeof(int),
267 .proc_handler = &proc_dointvec
270 .ctl_name = NET_TCP_MAX_ORPHANS,
271 .procname = "tcp_max_orphans",
272 .data = &sysctl_tcp_max_orphans,
273 .maxlen = sizeof(int),
275 .proc_handler = &proc_dointvec
278 .ctl_name = NET_TCP_MAX_TW_BUCKETS,
279 .procname = "tcp_max_tw_buckets",
280 .data = &tcp_death_row.sysctl_max_tw_buckets,
281 .maxlen = sizeof(int),
283 .proc_handler = &proc_dointvec
286 .ctl_name = NET_IPV4_IPFRAG_HIGH_THRESH,
287 .procname = "ipfrag_high_thresh",
288 .data = &ip4_frags_ctl.high_thresh,
289 .maxlen = sizeof(int),
291 .proc_handler = &proc_dointvec
294 .ctl_name = NET_IPV4_IPFRAG_LOW_THRESH,
295 .procname = "ipfrag_low_thresh",
296 .data = &ip4_frags_ctl.low_thresh,
297 .maxlen = sizeof(int),
299 .proc_handler = &proc_dointvec
302 .ctl_name = NET_IPV4_DYNADDR,
303 .procname = "ip_dynaddr",
304 .data = &sysctl_ip_dynaddr,
305 .maxlen = sizeof(int),
307 .proc_handler = &proc_dointvec
310 .ctl_name = NET_IPV4_IPFRAG_TIME,
311 .procname = "ipfrag_time",
312 .data = &ip4_frags_ctl.timeout,
313 .maxlen = sizeof(int),
315 .proc_handler = &proc_dointvec_jiffies,
316 .strategy = &sysctl_jiffies
319 .ctl_name = NET_IPV4_TCP_KEEPALIVE_TIME,
320 .procname = "tcp_keepalive_time",
321 .data = &sysctl_tcp_keepalive_time,
322 .maxlen = sizeof(int),
324 .proc_handler = &proc_dointvec_jiffies,
325 .strategy = &sysctl_jiffies
328 .ctl_name = NET_IPV4_TCP_KEEPALIVE_PROBES,
329 .procname = "tcp_keepalive_probes",
330 .data = &sysctl_tcp_keepalive_probes,
331 .maxlen = sizeof(int),
333 .proc_handler = &proc_dointvec
336 .ctl_name = NET_IPV4_TCP_KEEPALIVE_INTVL,
337 .procname = "tcp_keepalive_intvl",
338 .data = &sysctl_tcp_keepalive_intvl,
339 .maxlen = sizeof(int),
341 .proc_handler = &proc_dointvec_jiffies,
342 .strategy = &sysctl_jiffies
345 .ctl_name = NET_IPV4_TCP_RETRIES1,
346 .procname = "tcp_retries1",
347 .data = &sysctl_tcp_retries1,
348 .maxlen = sizeof(int),
350 .proc_handler = &proc_dointvec_minmax,
351 .strategy = &sysctl_intvec,
352 .extra2 = &tcp_retr1_max
355 .ctl_name = NET_IPV4_TCP_RETRIES2,
356 .procname = "tcp_retries2",
357 .data = &sysctl_tcp_retries2,
358 .maxlen = sizeof(int),
360 .proc_handler = &proc_dointvec
363 .ctl_name = NET_IPV4_TCP_FIN_TIMEOUT,
364 .procname = "tcp_fin_timeout",
365 .data = &sysctl_tcp_fin_timeout,
366 .maxlen = sizeof(int),
368 .proc_handler = &proc_dointvec_jiffies,
369 .strategy = &sysctl_jiffies
371 #ifdef CONFIG_SYN_COOKIES
373 .ctl_name = NET_TCP_SYNCOOKIES,
374 .procname = "tcp_syncookies",
375 .data = &sysctl_tcp_syncookies,
376 .maxlen = sizeof(int),
378 .proc_handler = &proc_dointvec
382 .ctl_name = NET_TCP_TW_RECYCLE,
383 .procname = "tcp_tw_recycle",
384 .data = &tcp_death_row.sysctl_tw_recycle,
385 .maxlen = sizeof(int),
387 .proc_handler = &proc_dointvec
390 .ctl_name = NET_TCP_ABORT_ON_OVERFLOW,
391 .procname = "tcp_abort_on_overflow",
392 .data = &sysctl_tcp_abort_on_overflow,
393 .maxlen = sizeof(int),
395 .proc_handler = &proc_dointvec
398 .ctl_name = NET_TCP_STDURG,
399 .procname = "tcp_stdurg",
400 .data = &sysctl_tcp_stdurg,
401 .maxlen = sizeof(int),
403 .proc_handler = &proc_dointvec
406 .ctl_name = NET_TCP_RFC1337,
407 .procname = "tcp_rfc1337",
408 .data = &sysctl_tcp_rfc1337,
409 .maxlen = sizeof(int),
411 .proc_handler = &proc_dointvec
414 .ctl_name = NET_TCP_MAX_SYN_BACKLOG,
415 .procname = "tcp_max_syn_backlog",
416 .data = &sysctl_max_syn_backlog,
417 .maxlen = sizeof(int),
419 .proc_handler = &proc_dointvec
422 .ctl_name = NET_IPV4_LOCAL_PORT_RANGE,
423 .procname = "ip_local_port_range",
424 .data = &sysctl_local_port_range,
425 .maxlen = sizeof(sysctl_local_port_range),
427 .proc_handler = &ipv4_local_port_range,
428 .strategy = &ipv4_sysctl_local_port_range,
431 .ctl_name = NET_IPV4_ICMP_ECHO_IGNORE_ALL,
432 .procname = "icmp_echo_ignore_all",
433 .data = &sysctl_icmp_echo_ignore_all,
434 .maxlen = sizeof(int),
436 .proc_handler = &proc_dointvec
439 .ctl_name = NET_IPV4_ICMP_ECHO_IGNORE_BROADCASTS,
440 .procname = "icmp_echo_ignore_broadcasts",
441 .data = &sysctl_icmp_echo_ignore_broadcasts,
442 .maxlen = sizeof(int),
444 .proc_handler = &proc_dointvec
447 .ctl_name = NET_IPV4_ICMP_IGNORE_BOGUS_ERROR_RESPONSES,
448 .procname = "icmp_ignore_bogus_error_responses",
449 .data = &sysctl_icmp_ignore_bogus_error_responses,
450 .maxlen = sizeof(int),
452 .proc_handler = &proc_dointvec
455 .ctl_name = NET_IPV4_ICMP_ERRORS_USE_INBOUND_IFADDR,
456 .procname = "icmp_errors_use_inbound_ifaddr",
457 .data = &sysctl_icmp_errors_use_inbound_ifaddr,
458 .maxlen = sizeof(int),
460 .proc_handler = &proc_dointvec
463 .ctl_name = NET_IPV4_ROUTE,
467 .child = ipv4_route_table
469 #ifdef CONFIG_IP_MULTICAST
471 .ctl_name = NET_IPV4_IGMP_MAX_MEMBERSHIPS,
472 .procname = "igmp_max_memberships",
473 .data = &sysctl_igmp_max_memberships,
474 .maxlen = sizeof(int),
476 .proc_handler = &proc_dointvec
481 .ctl_name = NET_IPV4_IGMP_MAX_MSF,
482 .procname = "igmp_max_msf",
483 .data = &sysctl_igmp_max_msf,
484 .maxlen = sizeof(int),
486 .proc_handler = &proc_dointvec
489 .ctl_name = NET_IPV4_INET_PEER_THRESHOLD,
490 .procname = "inet_peer_threshold",
491 .data = &inet_peer_threshold,
492 .maxlen = sizeof(int),
494 .proc_handler = &proc_dointvec
497 .ctl_name = NET_IPV4_INET_PEER_MINTTL,
498 .procname = "inet_peer_minttl",
499 .data = &inet_peer_minttl,
500 .maxlen = sizeof(int),
502 .proc_handler = &proc_dointvec_jiffies,
503 .strategy = &sysctl_jiffies
506 .ctl_name = NET_IPV4_INET_PEER_MAXTTL,
507 .procname = "inet_peer_maxttl",
508 .data = &inet_peer_maxttl,
509 .maxlen = sizeof(int),
511 .proc_handler = &proc_dointvec_jiffies,
512 .strategy = &sysctl_jiffies
515 .ctl_name = NET_IPV4_INET_PEER_GC_MINTIME,
516 .procname = "inet_peer_gc_mintime",
517 .data = &inet_peer_gc_mintime,
518 .maxlen = sizeof(int),
520 .proc_handler = &proc_dointvec_jiffies,
521 .strategy = &sysctl_jiffies
524 .ctl_name = NET_IPV4_INET_PEER_GC_MAXTIME,
525 .procname = "inet_peer_gc_maxtime",
526 .data = &inet_peer_gc_maxtime,
527 .maxlen = sizeof(int),
529 .proc_handler = &proc_dointvec_jiffies,
530 .strategy = &sysctl_jiffies
533 .ctl_name = NET_TCP_ORPHAN_RETRIES,
534 .procname = "tcp_orphan_retries",
535 .data = &sysctl_tcp_orphan_retries,
536 .maxlen = sizeof(int),
538 .proc_handler = &proc_dointvec
541 .ctl_name = NET_TCP_FACK,
542 .procname = "tcp_fack",
543 .data = &sysctl_tcp_fack,
544 .maxlen = sizeof(int),
546 .proc_handler = &proc_dointvec
549 .ctl_name = NET_TCP_REORDERING,
550 .procname = "tcp_reordering",
551 .data = &sysctl_tcp_reordering,
552 .maxlen = sizeof(int),
554 .proc_handler = &proc_dointvec
557 .ctl_name = NET_TCP_ECN,
558 .procname = "tcp_ecn",
559 .data = &sysctl_tcp_ecn,
560 .maxlen = sizeof(int),
562 .proc_handler = &proc_dointvec
565 .ctl_name = NET_TCP_DSACK,
566 .procname = "tcp_dsack",
567 .data = &sysctl_tcp_dsack,
568 .maxlen = sizeof(int),
570 .proc_handler = &proc_dointvec
573 .ctl_name = NET_TCP_MEM,
574 .procname = "tcp_mem",
575 .data = &sysctl_tcp_mem,
576 .maxlen = sizeof(sysctl_tcp_mem),
578 .proc_handler = &proc_dointvec
581 .ctl_name = NET_TCP_WMEM,
582 .procname = "tcp_wmem",
583 .data = &sysctl_tcp_wmem,
584 .maxlen = sizeof(sysctl_tcp_wmem),
586 .proc_handler = &proc_dointvec
589 .ctl_name = NET_TCP_RMEM,
590 .procname = "tcp_rmem",
591 .data = &sysctl_tcp_rmem,
592 .maxlen = sizeof(sysctl_tcp_rmem),
594 .proc_handler = &proc_dointvec
597 .ctl_name = NET_TCP_APP_WIN,
598 .procname = "tcp_app_win",
599 .data = &sysctl_tcp_app_win,
600 .maxlen = sizeof(int),
602 .proc_handler = &proc_dointvec
605 .ctl_name = NET_TCP_ADV_WIN_SCALE,
606 .procname = "tcp_adv_win_scale",
607 .data = &sysctl_tcp_adv_win_scale,
608 .maxlen = sizeof(int),
610 .proc_handler = &proc_dointvec
613 .ctl_name = NET_IPV4_ICMP_RATELIMIT,
614 .procname = "icmp_ratelimit",
615 .data = &sysctl_icmp_ratelimit,
616 .maxlen = sizeof(int),
618 .proc_handler = &proc_dointvec
621 .ctl_name = NET_IPV4_ICMP_RATEMASK,
622 .procname = "icmp_ratemask",
623 .data = &sysctl_icmp_ratemask,
624 .maxlen = sizeof(int),
626 .proc_handler = &proc_dointvec
629 .ctl_name = NET_TCP_TW_REUSE,
630 .procname = "tcp_tw_reuse",
631 .data = &sysctl_tcp_tw_reuse,
632 .maxlen = sizeof(int),
634 .proc_handler = &proc_dointvec
637 .ctl_name = NET_TCP_FRTO,
638 .procname = "tcp_frto",
639 .data = &sysctl_tcp_frto,
640 .maxlen = sizeof(int),
642 .proc_handler = &proc_dointvec
645 .ctl_name = NET_TCP_FRTO_RESPONSE,
646 .procname = "tcp_frto_response",
647 .data = &sysctl_tcp_frto_response,
648 .maxlen = sizeof(int),
650 .proc_handler = &proc_dointvec
653 .ctl_name = NET_TCP_LOW_LATENCY,
654 .procname = "tcp_low_latency",
655 .data = &sysctl_tcp_low_latency,
656 .maxlen = sizeof(int),
658 .proc_handler = &proc_dointvec
661 .ctl_name = NET_IPV4_IPFRAG_SECRET_INTERVAL,
662 .procname = "ipfrag_secret_interval",
663 .data = &ip4_frags_ctl.secret_interval,
664 .maxlen = sizeof(int),
666 .proc_handler = &proc_dointvec_jiffies,
667 .strategy = &sysctl_jiffies
670 .procname = "ipfrag_max_dist",
671 .data = &sysctl_ipfrag_max_dist,
672 .maxlen = sizeof(int),
674 .proc_handler = &proc_dointvec_minmax,
678 .ctl_name = NET_TCP_NO_METRICS_SAVE,
679 .procname = "tcp_no_metrics_save",
680 .data = &sysctl_tcp_nometrics_save,
681 .maxlen = sizeof(int),
683 .proc_handler = &proc_dointvec,
686 .ctl_name = NET_TCP_MODERATE_RCVBUF,
687 .procname = "tcp_moderate_rcvbuf",
688 .data = &sysctl_tcp_moderate_rcvbuf,
689 .maxlen = sizeof(int),
691 .proc_handler = &proc_dointvec,
694 .ctl_name = NET_TCP_TSO_WIN_DIVISOR,
695 .procname = "tcp_tso_win_divisor",
696 .data = &sysctl_tcp_tso_win_divisor,
697 .maxlen = sizeof(int),
699 .proc_handler = &proc_dointvec,
702 .ctl_name = NET_TCP_CONG_CONTROL,
703 .procname = "tcp_congestion_control",
705 .maxlen = TCP_CA_NAME_MAX,
706 .proc_handler = &proc_tcp_congestion_control,
707 .strategy = &sysctl_tcp_congestion_control,
710 .ctl_name = NET_TCP_ABC,
711 .procname = "tcp_abc",
712 .data = &sysctl_tcp_abc,
713 .maxlen = sizeof(int),
715 .proc_handler = &proc_dointvec,
718 .ctl_name = NET_TCP_MTU_PROBING,
719 .procname = "tcp_mtu_probing",
720 .data = &sysctl_tcp_mtu_probing,
721 .maxlen = sizeof(int),
723 .proc_handler = &proc_dointvec,
726 .ctl_name = NET_TCP_BASE_MSS,
727 .procname = "tcp_base_mss",
728 .data = &sysctl_tcp_base_mss,
729 .maxlen = sizeof(int),
731 .proc_handler = &proc_dointvec,
734 .ctl_name = NET_IPV4_TCP_WORKAROUND_SIGNED_WINDOWS,
735 .procname = "tcp_workaround_signed_windows",
736 .data = &sysctl_tcp_workaround_signed_windows,
737 .maxlen = sizeof(int),
739 .proc_handler = &proc_dointvec
741 #ifdef CONFIG_NET_DMA
743 .ctl_name = NET_TCP_DMA_COPYBREAK,
744 .procname = "tcp_dma_copybreak",
745 .data = &sysctl_tcp_dma_copybreak,
746 .maxlen = sizeof(int),
748 .proc_handler = &proc_dointvec
752 .ctl_name = NET_TCP_SLOW_START_AFTER_IDLE,
753 .procname = "tcp_slow_start_after_idle",
754 .data = &sysctl_tcp_slow_start_after_idle,
755 .maxlen = sizeof(int),
757 .proc_handler = &proc_dointvec
759 #ifdef CONFIG_NETLABEL
761 .ctl_name = NET_CIPSOV4_CACHE_ENABLE,
762 .procname = "cipso_cache_enable",
763 .data = &cipso_v4_cache_enabled,
764 .maxlen = sizeof(int),
766 .proc_handler = &proc_dointvec,
769 .ctl_name = NET_CIPSOV4_CACHE_BUCKET_SIZE,
770 .procname = "cipso_cache_bucket_size",
771 .data = &cipso_v4_cache_bucketsize,
772 .maxlen = sizeof(int),
774 .proc_handler = &proc_dointvec,
777 .ctl_name = NET_CIPSOV4_RBM_OPTFMT,
778 .procname = "cipso_rbm_optfmt",
779 .data = &cipso_v4_rbm_optfmt,
780 .maxlen = sizeof(int),
782 .proc_handler = &proc_dointvec,
785 .ctl_name = NET_CIPSOV4_RBM_STRICTVALID,
786 .procname = "cipso_rbm_strictvalid",
787 .data = &cipso_v4_rbm_strictvalid,
788 .maxlen = sizeof(int),
790 .proc_handler = &proc_dointvec,
792 #endif /* CONFIG_NETLABEL */
794 .procname = "tcp_available_congestion_control",
795 .maxlen = TCP_CA_BUF_MAX,
797 .proc_handler = &proc_tcp_available_congestion_control,
800 .ctl_name = NET_TCP_ALLOWED_CONG_CONTROL,
801 .procname = "tcp_allowed_congestion_control",
802 .maxlen = TCP_CA_BUF_MAX,
804 .proc_handler = &proc_allowed_congestion_control,
805 .strategy = &strategy_allowed_congestion_control,
808 .ctl_name = NET_TCP_MAX_SSTHRESH,
809 .procname = "tcp_max_ssthresh",
810 .data = &sysctl_tcp_max_ssthresh,
811 .maxlen = sizeof(int),
813 .proc_handler = &proc_dointvec,
818 static __initdata struct ctl_path net_ipv4_path[] = {
819 { .procname = "net", .ctl_name = CTL_NET, },
820 { .procname = "ipv4", .ctl_name = NET_IPV4, },
824 static __init int sysctl_ipv4_init(void)
826 struct ctl_table_header *hdr;
828 hdr = register_sysctl_paths(net_ipv4_path, ipv4_table);
829 return hdr == NULL ? -ENOMEM : 0;
832 __initcall(sysctl_ipv4_init);