1 // SPDX-License-Identifier: GPL-2.0-or-later
2 /* SCTP kernel implementation
3 * (C) Copyright IBM Corp. 2002, 2004
4 * Copyright (c) 2002 Intel Corp.
6 * This file is part of the SCTP kernel implementation
8 * Sysctl related interfaces for SCTP.
10 * Please send any bug reports or fixes you make to the
12 * lksctp developers <linux-sctp@vger.kernel.org>
14 * Written or modified by:
15 * Mingqin Liu <liuming@us.ibm.com>
16 * Jon Grimm <jgrimm@us.ibm.com>
17 * Ardelle Fan <ardelle.fan@intel.com>
18 * Ryan Layer <rmlayer@us.ibm.com>
19 * Sridhar Samudrala <sri@us.ibm.com>
22 #define pr_fmt(fmt) KBUILD_MODNAME ": " fmt
24 #include <net/sctp/structs.h>
25 #include <net/sctp/sctp.h>
26 #include <linux/sysctl.h>
28 static int timer_max
= 86400000; /* ms in one day */
29 static int sack_timer_min
= 1;
30 static int sack_timer_max
= 500;
31 static int addr_scope_max
= SCTP_SCOPE_POLICY_MAX
;
32 static int rwnd_scale_max
= 16;
33 static int rto_alpha_min
= 0;
34 static int rto_beta_min
= 0;
35 static int rto_alpha_max
= 1000;
36 static int rto_beta_max
= 1000;
37 static int pf_expose_max
= SCTP_PF_EXPOSE_MAX
;
38 static int ps_retrans_max
= SCTP_PS_RETRANS_MAX
;
39 static int udp_port_max
= 65535;
41 static unsigned long max_autoclose_min
= 0;
42 static unsigned long max_autoclose_max
=
43 (MAX_SCHEDULE_TIMEOUT
/ HZ
> UINT_MAX
)
44 ? UINT_MAX
: MAX_SCHEDULE_TIMEOUT
/ HZ
;
46 static int proc_sctp_do_hmac_alg(struct ctl_table
*ctl
, int write
,
47 void *buffer
, size_t *lenp
, loff_t
*ppos
);
48 static int proc_sctp_do_rto_min(struct ctl_table
*ctl
, int write
,
49 void *buffer
, size_t *lenp
, loff_t
*ppos
);
50 static int proc_sctp_do_rto_max(struct ctl_table
*ctl
, int write
, void *buffer
,
51 size_t *lenp
, loff_t
*ppos
);
52 static int proc_sctp_do_udp_port(struct ctl_table
*ctl
, int write
, void *buffer
,
53 size_t *lenp
, loff_t
*ppos
);
54 static int proc_sctp_do_alpha_beta(struct ctl_table
*ctl
, int write
,
55 void *buffer
, size_t *lenp
, loff_t
*ppos
);
56 static int proc_sctp_do_auth(struct ctl_table
*ctl
, int write
,
57 void *buffer
, size_t *lenp
, loff_t
*ppos
);
58 static int proc_sctp_do_probe_interval(struct ctl_table
*ctl
, int write
,
59 void *buffer
, size_t *lenp
, loff_t
*ppos
);
61 static struct ctl_table sctp_table
[] = {
63 .procname
= "sctp_mem",
64 .data
= &sysctl_sctp_mem
,
65 .maxlen
= sizeof(sysctl_sctp_mem
),
67 .proc_handler
= proc_doulongvec_minmax
70 .procname
= "sctp_rmem",
71 .data
= &sysctl_sctp_rmem
,
72 .maxlen
= sizeof(sysctl_sctp_rmem
),
74 .proc_handler
= proc_dointvec
,
77 .procname
= "sctp_wmem",
78 .data
= &sysctl_sctp_wmem
,
79 .maxlen
= sizeof(sysctl_sctp_wmem
),
81 .proc_handler
= proc_dointvec
,
87 static struct ctl_table sctp_net_table
[] = {
89 .procname
= "rto_initial",
90 .data
= &init_net
.sctp
.rto_initial
,
91 .maxlen
= sizeof(unsigned int),
93 .proc_handler
= proc_dointvec_minmax
,
98 .procname
= "rto_min",
99 .data
= &init_net
.sctp
.rto_min
,
100 .maxlen
= sizeof(unsigned int),
102 .proc_handler
= proc_sctp_do_rto_min
,
103 .extra1
= SYSCTL_ONE
,
104 .extra2
= &init_net
.sctp
.rto_max
107 .procname
= "rto_max",
108 .data
= &init_net
.sctp
.rto_max
,
109 .maxlen
= sizeof(unsigned int),
111 .proc_handler
= proc_sctp_do_rto_max
,
112 .extra1
= &init_net
.sctp
.rto_min
,
116 .procname
= "rto_alpha_exp_divisor",
117 .data
= &init_net
.sctp
.rto_alpha
,
118 .maxlen
= sizeof(int),
120 .proc_handler
= proc_sctp_do_alpha_beta
,
121 .extra1
= &rto_alpha_min
,
122 .extra2
= &rto_alpha_max
,
125 .procname
= "rto_beta_exp_divisor",
126 .data
= &init_net
.sctp
.rto_beta
,
127 .maxlen
= sizeof(int),
129 .proc_handler
= proc_sctp_do_alpha_beta
,
130 .extra1
= &rto_beta_min
,
131 .extra2
= &rto_beta_max
,
134 .procname
= "max_burst",
135 .data
= &init_net
.sctp
.max_burst
,
136 .maxlen
= sizeof(int),
138 .proc_handler
= proc_dointvec_minmax
,
139 .extra1
= SYSCTL_ZERO
,
140 .extra2
= SYSCTL_INT_MAX
,
143 .procname
= "cookie_preserve_enable",
144 .data
= &init_net
.sctp
.cookie_preserve_enable
,
145 .maxlen
= sizeof(int),
147 .proc_handler
= proc_dointvec
,
150 .procname
= "cookie_hmac_alg",
151 .data
= &init_net
.sctp
.sctp_hmac_alg
,
154 .proc_handler
= proc_sctp_do_hmac_alg
,
157 .procname
= "valid_cookie_life",
158 .data
= &init_net
.sctp
.valid_cookie_life
,
159 .maxlen
= sizeof(unsigned int),
161 .proc_handler
= proc_dointvec_minmax
,
162 .extra1
= SYSCTL_ONE
,
166 .procname
= "sack_timeout",
167 .data
= &init_net
.sctp
.sack_timeout
,
168 .maxlen
= sizeof(int),
170 .proc_handler
= proc_dointvec_minmax
,
171 .extra1
= &sack_timer_min
,
172 .extra2
= &sack_timer_max
,
175 .procname
= "hb_interval",
176 .data
= &init_net
.sctp
.hb_interval
,
177 .maxlen
= sizeof(unsigned int),
179 .proc_handler
= proc_dointvec_minmax
,
180 .extra1
= SYSCTL_ONE
,
184 .procname
= "association_max_retrans",
185 .data
= &init_net
.sctp
.max_retrans_association
,
186 .maxlen
= sizeof(int),
188 .proc_handler
= proc_dointvec_minmax
,
189 .extra1
= SYSCTL_ONE
,
190 .extra2
= SYSCTL_INT_MAX
,
193 .procname
= "path_max_retrans",
194 .data
= &init_net
.sctp
.max_retrans_path
,
195 .maxlen
= sizeof(int),
197 .proc_handler
= proc_dointvec_minmax
,
198 .extra1
= SYSCTL_ONE
,
199 .extra2
= SYSCTL_INT_MAX
,
202 .procname
= "max_init_retransmits",
203 .data
= &init_net
.sctp
.max_retrans_init
,
204 .maxlen
= sizeof(int),
206 .proc_handler
= proc_dointvec_minmax
,
207 .extra1
= SYSCTL_ONE
,
208 .extra2
= SYSCTL_INT_MAX
,
211 .procname
= "pf_retrans",
212 .data
= &init_net
.sctp
.pf_retrans
,
213 .maxlen
= sizeof(int),
215 .proc_handler
= proc_dointvec_minmax
,
216 .extra1
= SYSCTL_ZERO
,
217 .extra2
= &init_net
.sctp
.ps_retrans
,
220 .procname
= "ps_retrans",
221 .data
= &init_net
.sctp
.ps_retrans
,
222 .maxlen
= sizeof(int),
224 .proc_handler
= proc_dointvec_minmax
,
225 .extra1
= &init_net
.sctp
.pf_retrans
,
226 .extra2
= &ps_retrans_max
,
229 .procname
= "sndbuf_policy",
230 .data
= &init_net
.sctp
.sndbuf_policy
,
231 .maxlen
= sizeof(int),
233 .proc_handler
= proc_dointvec
,
236 .procname
= "rcvbuf_policy",
237 .data
= &init_net
.sctp
.rcvbuf_policy
,
238 .maxlen
= sizeof(int),
240 .proc_handler
= proc_dointvec
,
243 .procname
= "default_auto_asconf",
244 .data
= &init_net
.sctp
.default_auto_asconf
,
245 .maxlen
= sizeof(int),
247 .proc_handler
= proc_dointvec
,
250 .procname
= "addip_enable",
251 .data
= &init_net
.sctp
.addip_enable
,
252 .maxlen
= sizeof(int),
254 .proc_handler
= proc_dointvec
,
257 .procname
= "addip_noauth_enable",
258 .data
= &init_net
.sctp
.addip_noauth
,
259 .maxlen
= sizeof(int),
261 .proc_handler
= proc_dointvec
,
264 .procname
= "prsctp_enable",
265 .data
= &init_net
.sctp
.prsctp_enable
,
266 .maxlen
= sizeof(int),
268 .proc_handler
= proc_dointvec
,
271 .procname
= "reconf_enable",
272 .data
= &init_net
.sctp
.reconf_enable
,
273 .maxlen
= sizeof(int),
275 .proc_handler
= proc_dointvec
,
278 .procname
= "auth_enable",
279 .data
= &init_net
.sctp
.auth_enable
,
280 .maxlen
= sizeof(int),
282 .proc_handler
= proc_sctp_do_auth
,
285 .procname
= "intl_enable",
286 .data
= &init_net
.sctp
.intl_enable
,
287 .maxlen
= sizeof(int),
289 .proc_handler
= proc_dointvec
,
292 .procname
= "ecn_enable",
293 .data
= &init_net
.sctp
.ecn_enable
,
294 .maxlen
= sizeof(int),
296 .proc_handler
= proc_dointvec
,
299 .procname
= "plpmtud_probe_interval",
300 .data
= &init_net
.sctp
.probe_interval
,
301 .maxlen
= sizeof(int),
303 .proc_handler
= proc_sctp_do_probe_interval
,
306 .procname
= "udp_port",
307 .data
= &init_net
.sctp
.udp_port
,
308 .maxlen
= sizeof(int),
310 .proc_handler
= proc_sctp_do_udp_port
,
311 .extra1
= SYSCTL_ZERO
,
312 .extra2
= &udp_port_max
,
315 .procname
= "encap_port",
316 .data
= &init_net
.sctp
.encap_port
,
317 .maxlen
= sizeof(int),
319 .proc_handler
= proc_dointvec_minmax
,
320 .extra1
= SYSCTL_ZERO
,
321 .extra2
= &udp_port_max
,
324 .procname
= "addr_scope_policy",
325 .data
= &init_net
.sctp
.scope_policy
,
326 .maxlen
= sizeof(int),
328 .proc_handler
= proc_dointvec_minmax
,
329 .extra1
= SYSCTL_ZERO
,
330 .extra2
= &addr_scope_max
,
333 .procname
= "rwnd_update_shift",
334 .data
= &init_net
.sctp
.rwnd_upd_shift
,
335 .maxlen
= sizeof(int),
337 .proc_handler
= &proc_dointvec_minmax
,
338 .extra1
= SYSCTL_ONE
,
339 .extra2
= &rwnd_scale_max
,
342 .procname
= "max_autoclose",
343 .data
= &init_net
.sctp
.max_autoclose
,
344 .maxlen
= sizeof(unsigned long),
346 .proc_handler
= &proc_doulongvec_minmax
,
347 .extra1
= &max_autoclose_min
,
348 .extra2
= &max_autoclose_max
,
351 .procname
= "pf_enable",
352 .data
= &init_net
.sctp
.pf_enable
,
353 .maxlen
= sizeof(int),
355 .proc_handler
= proc_dointvec
,
358 .procname
= "pf_expose",
359 .data
= &init_net
.sctp
.pf_expose
,
360 .maxlen
= sizeof(int),
362 .proc_handler
= proc_dointvec_minmax
,
363 .extra1
= SYSCTL_ZERO
,
364 .extra2
= &pf_expose_max
,
370 static int proc_sctp_do_hmac_alg(struct ctl_table
*ctl
, int write
,
371 void *buffer
, size_t *lenp
, loff_t
*ppos
)
373 struct net
*net
= current
->nsproxy
->net_ns
;
374 struct ctl_table tbl
;
375 bool changed
= false;
380 memset(&tbl
, 0, sizeof(struct ctl_table
));
384 tbl
.maxlen
= sizeof(tmp
);
386 tbl
.data
= net
->sctp
.sctp_hmac_alg
? : none
;
387 tbl
.maxlen
= strlen(tbl
.data
);
390 ret
= proc_dostring(&tbl
, write
, buffer
, lenp
, ppos
);
391 if (write
&& ret
== 0) {
392 #ifdef CONFIG_CRYPTO_MD5
393 if (!strncmp(tmp
, "md5", 3)) {
394 net
->sctp
.sctp_hmac_alg
= "md5";
398 #ifdef CONFIG_CRYPTO_SHA1
399 if (!strncmp(tmp
, "sha1", 4)) {
400 net
->sctp
.sctp_hmac_alg
= "sha1";
404 if (!strncmp(tmp
, "none", 4)) {
405 net
->sctp
.sctp_hmac_alg
= NULL
;
415 static int proc_sctp_do_rto_min(struct ctl_table
*ctl
, int write
,
416 void *buffer
, size_t *lenp
, loff_t
*ppos
)
418 struct net
*net
= current
->nsproxy
->net_ns
;
419 unsigned int min
= *(unsigned int *) ctl
->extra1
;
420 unsigned int max
= *(unsigned int *) ctl
->extra2
;
421 struct ctl_table tbl
;
424 memset(&tbl
, 0, sizeof(struct ctl_table
));
425 tbl
.maxlen
= sizeof(unsigned int);
428 tbl
.data
= &new_value
;
430 tbl
.data
= &net
->sctp
.rto_min
;
432 ret
= proc_dointvec(&tbl
, write
, buffer
, lenp
, ppos
);
433 if (write
&& ret
== 0) {
434 if (new_value
> max
|| new_value
< min
)
437 net
->sctp
.rto_min
= new_value
;
443 static int proc_sctp_do_rto_max(struct ctl_table
*ctl
, int write
,
444 void *buffer
, size_t *lenp
, loff_t
*ppos
)
446 struct net
*net
= current
->nsproxy
->net_ns
;
447 unsigned int min
= *(unsigned int *) ctl
->extra1
;
448 unsigned int max
= *(unsigned int *) ctl
->extra2
;
449 struct ctl_table tbl
;
452 memset(&tbl
, 0, sizeof(struct ctl_table
));
453 tbl
.maxlen
= sizeof(unsigned int);
456 tbl
.data
= &new_value
;
458 tbl
.data
= &net
->sctp
.rto_max
;
460 ret
= proc_dointvec(&tbl
, write
, buffer
, lenp
, ppos
);
461 if (write
&& ret
== 0) {
462 if (new_value
> max
|| new_value
< min
)
465 net
->sctp
.rto_max
= new_value
;
471 static int proc_sctp_do_alpha_beta(struct ctl_table
*ctl
, int write
,
472 void *buffer
, size_t *lenp
, loff_t
*ppos
)
475 pr_warn_once("Changing rto_alpha or rto_beta may lead to "
476 "suboptimal rtt/srtt estimations!\n");
478 return proc_dointvec_minmax(ctl
, write
, buffer
, lenp
, ppos
);
481 static int proc_sctp_do_auth(struct ctl_table
*ctl
, int write
,
482 void *buffer
, size_t *lenp
, loff_t
*ppos
)
484 struct net
*net
= current
->nsproxy
->net_ns
;
485 struct ctl_table tbl
;
488 memset(&tbl
, 0, sizeof(struct ctl_table
));
489 tbl
.maxlen
= sizeof(unsigned int);
492 tbl
.data
= &new_value
;
494 tbl
.data
= &net
->sctp
.auth_enable
;
496 ret
= proc_dointvec(&tbl
, write
, buffer
, lenp
, ppos
);
497 if (write
&& ret
== 0) {
498 struct sock
*sk
= net
->sctp
.ctl_sock
;
500 net
->sctp
.auth_enable
= new_value
;
501 /* Update the value in the control socket */
503 sctp_sk(sk
)->ep
->auth_enable
= new_value
;
510 static int proc_sctp_do_udp_port(struct ctl_table
*ctl
, int write
,
511 void *buffer
, size_t *lenp
, loff_t
*ppos
)
513 struct net
*net
= current
->nsproxy
->net_ns
;
514 unsigned int min
= *(unsigned int *)ctl
->extra1
;
515 unsigned int max
= *(unsigned int *)ctl
->extra2
;
516 struct ctl_table tbl
;
519 memset(&tbl
, 0, sizeof(struct ctl_table
));
520 tbl
.maxlen
= sizeof(unsigned int);
523 tbl
.data
= &new_value
;
525 tbl
.data
= &net
->sctp
.udp_port
;
527 ret
= proc_dointvec(&tbl
, write
, buffer
, lenp
, ppos
);
528 if (write
&& ret
== 0) {
529 struct sock
*sk
= net
->sctp
.ctl_sock
;
531 if (new_value
> max
|| new_value
< min
)
534 net
->sctp
.udp_port
= new_value
;
535 sctp_udp_sock_stop(net
);
537 ret
= sctp_udp_sock_start(net
);
539 net
->sctp
.udp_port
= 0;
542 /* Update the value in the control socket */
544 sctp_sk(sk
)->udp_port
= htons(net
->sctp
.udp_port
);
551 static int proc_sctp_do_probe_interval(struct ctl_table
*ctl
, int write
,
552 void *buffer
, size_t *lenp
, loff_t
*ppos
)
554 struct net
*net
= current
->nsproxy
->net_ns
;
555 struct ctl_table tbl
;
558 memset(&tbl
, 0, sizeof(struct ctl_table
));
559 tbl
.maxlen
= sizeof(unsigned int);
562 tbl
.data
= &new_value
;
564 tbl
.data
= &net
->sctp
.probe_interval
;
566 ret
= proc_dointvec(&tbl
, write
, buffer
, lenp
, ppos
);
567 if (write
&& ret
== 0) {
568 if (new_value
&& new_value
< SCTP_PROBE_TIMER_MIN
)
571 net
->sctp
.probe_interval
= new_value
;
577 int sctp_sysctl_net_register(struct net
*net
)
579 struct ctl_table
*table
;
582 table
= kmemdup(sctp_net_table
, sizeof(sctp_net_table
), GFP_KERNEL
);
586 for (i
= 0; table
[i
].data
; i
++)
587 table
[i
].data
+= (char *)(&net
->sctp
) - (char *)&init_net
.sctp
;
589 net
->sctp
.sysctl_header
= register_net_sysctl(net
, "net/sctp", table
);
590 if (net
->sctp
.sysctl_header
== NULL
) {
597 void sctp_sysctl_net_unregister(struct net
*net
)
599 struct ctl_table
*table
;
601 table
= net
->sctp
.sysctl_header
->ctl_table_arg
;
602 unregister_net_sysctl_table(net
->sctp
.sysctl_header
);
606 static struct ctl_table_header
*sctp_sysctl_header
;
608 /* Sysctl registration. */
609 void sctp_sysctl_register(void)
611 sctp_sysctl_header
= register_net_sysctl(&init_net
, "net/sctp", sctp_table
);
614 /* Sysctl deregistration. */
615 void sctp_sysctl_unregister(void)
617 unregister_net_sysctl_table(sctp_sysctl_header
);