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1 /* SCTP kernel implementation
2 * (C) Copyright IBM Corp. 2002, 2004
3 * Copyright (c) 2002 Intel Corp.
5 * This file is part of the SCTP kernel implementation
7 * Sysctl related interfaces for SCTP.
9 * This SCTP implementation is free software;
10 * you can redistribute it and/or modify it under the terms of
11 * the GNU General Public License as published by
12 * the Free Software Foundation; either version 2, or (at your option)
15 * This SCTP implementation is distributed in the hope that it
16 * will be useful, but WITHOUT ANY WARRANTY; without even the implied
17 * ************************
18 * warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.
19 * See the GNU General Public License for more details.
21 * You should have received a copy of the GNU General Public License
22 * along with GNU CC; see the file COPYING. If not, see
23 * <http://www.gnu.org/licenses/>.
25 * Please send any bug reports or fixes you make to the
27 * lksctp developers <linux-sctp@vger.kernel.org>
29 * Written or modified by:
30 * Mingqin Liu <liuming@us.ibm.com>
31 * Jon Grimm <jgrimm@us.ibm.com>
32 * Ardelle Fan <ardelle.fan@intel.com>
33 * Ryan Layer <rmlayer@us.ibm.com>
34 * Sridhar Samudrala <sri@us.ibm.com>
37 #define pr_fmt(fmt) KBUILD_MODNAME ": " fmt
39 #include <net/sctp/structs.h>
40 #include <net/sctp/sctp.h>
41 #include <linux/sysctl.h>
45 static int timer_max
= 86400000; /* ms in one day */
46 static int int_max
= INT_MAX
;
47 static int sack_timer_min
= 1;
48 static int sack_timer_max
= 500;
49 static int addr_scope_max
= SCTP_SCOPE_POLICY_MAX
;
50 static int rwnd_scale_max
= 16;
51 static int rto_alpha_min
= 0;
52 static int rto_beta_min
= 0;
53 static int rto_alpha_max
= 1000;
54 static int rto_beta_max
= 1000;
56 static unsigned long max_autoclose_min
= 0;
57 static unsigned long max_autoclose_max
=
58 (MAX_SCHEDULE_TIMEOUT
/ HZ
> UINT_MAX
)
59 ? UINT_MAX
: MAX_SCHEDULE_TIMEOUT
/ HZ
;
61 static int proc_sctp_do_hmac_alg(struct ctl_table
*ctl
, int write
,
62 void __user
*buffer
, size_t *lenp
,
64 static int proc_sctp_do_rto_min(struct ctl_table
*ctl
, int write
,
65 void __user
*buffer
, size_t *lenp
,
67 static int proc_sctp_do_rto_max(struct ctl_table
*ctl
, int write
,
68 void __user
*buffer
, size_t *lenp
,
70 static int proc_sctp_do_alpha_beta(struct ctl_table
*ctl
, int write
,
71 void __user
*buffer
, size_t *lenp
,
73 static int proc_sctp_do_auth(struct ctl_table
*ctl
, int write
,
74 void __user
*buffer
, size_t *lenp
,
77 static struct ctl_table sctp_table
[] = {
79 .procname
= "sctp_mem",
80 .data
= &sysctl_sctp_mem
,
81 .maxlen
= sizeof(sysctl_sctp_mem
),
83 .proc_handler
= proc_doulongvec_minmax
86 .procname
= "sctp_rmem",
87 .data
= &sysctl_sctp_rmem
,
88 .maxlen
= sizeof(sysctl_sctp_rmem
),
90 .proc_handler
= proc_dointvec
,
93 .procname
= "sctp_wmem",
94 .data
= &sysctl_sctp_wmem
,
95 .maxlen
= sizeof(sysctl_sctp_wmem
),
97 .proc_handler
= proc_dointvec
,
103 static struct ctl_table sctp_net_table
[] = {
105 .procname
= "rto_initial",
106 .data
= &init_net
.sctp
.rto_initial
,
107 .maxlen
= sizeof(unsigned int),
109 .proc_handler
= proc_dointvec_minmax
,
114 .procname
= "rto_min",
115 .data
= &init_net
.sctp
.rto_min
,
116 .maxlen
= sizeof(unsigned int),
118 .proc_handler
= proc_sctp_do_rto_min
,
120 .extra2
= &init_net
.sctp
.rto_max
123 .procname
= "rto_max",
124 .data
= &init_net
.sctp
.rto_max
,
125 .maxlen
= sizeof(unsigned int),
127 .proc_handler
= proc_sctp_do_rto_max
,
128 .extra1
= &init_net
.sctp
.rto_min
,
132 .procname
= "rto_alpha_exp_divisor",
133 .data
= &init_net
.sctp
.rto_alpha
,
134 .maxlen
= sizeof(int),
136 .proc_handler
= proc_sctp_do_alpha_beta
,
137 .extra1
= &rto_alpha_min
,
138 .extra2
= &rto_alpha_max
,
141 .procname
= "rto_beta_exp_divisor",
142 .data
= &init_net
.sctp
.rto_beta
,
143 .maxlen
= sizeof(int),
145 .proc_handler
= proc_sctp_do_alpha_beta
,
146 .extra1
= &rto_beta_min
,
147 .extra2
= &rto_beta_max
,
150 .procname
= "max_burst",
151 .data
= &init_net
.sctp
.max_burst
,
152 .maxlen
= sizeof(int),
154 .proc_handler
= proc_dointvec_minmax
,
159 .procname
= "cookie_preserve_enable",
160 .data
= &init_net
.sctp
.cookie_preserve_enable
,
161 .maxlen
= sizeof(int),
163 .proc_handler
= proc_dointvec
,
166 .procname
= "cookie_hmac_alg",
167 .data
= &init_net
.sctp
.sctp_hmac_alg
,
170 .proc_handler
= proc_sctp_do_hmac_alg
,
173 .procname
= "valid_cookie_life",
174 .data
= &init_net
.sctp
.valid_cookie_life
,
175 .maxlen
= sizeof(unsigned int),
177 .proc_handler
= proc_dointvec_minmax
,
182 .procname
= "sack_timeout",
183 .data
= &init_net
.sctp
.sack_timeout
,
184 .maxlen
= sizeof(int),
186 .proc_handler
= proc_dointvec_minmax
,
187 .extra1
= &sack_timer_min
,
188 .extra2
= &sack_timer_max
,
191 .procname
= "hb_interval",
192 .data
= &init_net
.sctp
.hb_interval
,
193 .maxlen
= sizeof(unsigned int),
195 .proc_handler
= proc_dointvec_minmax
,
200 .procname
= "association_max_retrans",
201 .data
= &init_net
.sctp
.max_retrans_association
,
202 .maxlen
= sizeof(int),
204 .proc_handler
= proc_dointvec_minmax
,
209 .procname
= "path_max_retrans",
210 .data
= &init_net
.sctp
.max_retrans_path
,
211 .maxlen
= sizeof(int),
213 .proc_handler
= proc_dointvec_minmax
,
218 .procname
= "max_init_retransmits",
219 .data
= &init_net
.sctp
.max_retrans_init
,
220 .maxlen
= sizeof(int),
222 .proc_handler
= proc_dointvec_minmax
,
227 .procname
= "pf_retrans",
228 .data
= &init_net
.sctp
.pf_retrans
,
229 .maxlen
= sizeof(int),
231 .proc_handler
= proc_dointvec_minmax
,
236 .procname
= "sndbuf_policy",
237 .data
= &init_net
.sctp
.sndbuf_policy
,
238 .maxlen
= sizeof(int),
240 .proc_handler
= proc_dointvec
,
243 .procname
= "rcvbuf_policy",
244 .data
= &init_net
.sctp
.rcvbuf_policy
,
245 .maxlen
= sizeof(int),
247 .proc_handler
= proc_dointvec
,
250 .procname
= "default_auto_asconf",
251 .data
= &init_net
.sctp
.default_auto_asconf
,
252 .maxlen
= sizeof(int),
254 .proc_handler
= proc_dointvec
,
257 .procname
= "addip_enable",
258 .data
= &init_net
.sctp
.addip_enable
,
259 .maxlen
= sizeof(int),
261 .proc_handler
= proc_dointvec
,
264 .procname
= "addip_noauth_enable",
265 .data
= &init_net
.sctp
.addip_noauth
,
266 .maxlen
= sizeof(int),
268 .proc_handler
= proc_dointvec
,
271 .procname
= "prsctp_enable",
272 .data
= &init_net
.sctp
.prsctp_enable
,
273 .maxlen
= sizeof(int),
275 .proc_handler
= proc_dointvec
,
278 .procname
= "reconf_enable",
279 .data
= &init_net
.sctp
.reconf_enable
,
280 .maxlen
= sizeof(int),
282 .proc_handler
= proc_dointvec
,
285 .procname
= "auth_enable",
286 .data
= &init_net
.sctp
.auth_enable
,
287 .maxlen
= sizeof(int),
289 .proc_handler
= proc_sctp_do_auth
,
292 .procname
= "addr_scope_policy",
293 .data
= &init_net
.sctp
.scope_policy
,
294 .maxlen
= sizeof(int),
296 .proc_handler
= proc_dointvec_minmax
,
298 .extra2
= &addr_scope_max
,
301 .procname
= "rwnd_update_shift",
302 .data
= &init_net
.sctp
.rwnd_upd_shift
,
303 .maxlen
= sizeof(int),
305 .proc_handler
= &proc_dointvec_minmax
,
307 .extra2
= &rwnd_scale_max
,
310 .procname
= "max_autoclose",
311 .data
= &init_net
.sctp
.max_autoclose
,
312 .maxlen
= sizeof(unsigned long),
314 .proc_handler
= &proc_doulongvec_minmax
,
315 .extra1
= &max_autoclose_min
,
316 .extra2
= &max_autoclose_max
,
319 .procname
= "pf_enable",
320 .data
= &init_net
.sctp
.pf_enable
,
321 .maxlen
= sizeof(int),
323 .proc_handler
= proc_dointvec
,
329 static int proc_sctp_do_hmac_alg(struct ctl_table
*ctl
, int write
,
330 void __user
*buffer
, size_t *lenp
,
333 struct net
*net
= current
->nsproxy
->net_ns
;
334 struct ctl_table tbl
;
335 bool changed
= false;
340 memset(&tbl
, 0, sizeof(struct ctl_table
));
344 tbl
.maxlen
= sizeof(tmp
);
346 tbl
.data
= net
->sctp
.sctp_hmac_alg
? : none
;
347 tbl
.maxlen
= strlen(tbl
.data
);
350 ret
= proc_dostring(&tbl
, write
, buffer
, lenp
, ppos
);
351 if (write
&& ret
== 0) {
352 #ifdef CONFIG_CRYPTO_MD5
353 if (!strncmp(tmp
, "md5", 3)) {
354 net
->sctp
.sctp_hmac_alg
= "md5";
358 #ifdef CONFIG_CRYPTO_SHA1
359 if (!strncmp(tmp
, "sha1", 4)) {
360 net
->sctp
.sctp_hmac_alg
= "sha1";
364 if (!strncmp(tmp
, "none", 4)) {
365 net
->sctp
.sctp_hmac_alg
= NULL
;
375 static int proc_sctp_do_rto_min(struct ctl_table
*ctl
, int write
,
376 void __user
*buffer
, size_t *lenp
,
379 struct net
*net
= current
->nsproxy
->net_ns
;
380 unsigned int min
= *(unsigned int *) ctl
->extra1
;
381 unsigned int max
= *(unsigned int *) ctl
->extra2
;
382 struct ctl_table tbl
;
385 memset(&tbl
, 0, sizeof(struct ctl_table
));
386 tbl
.maxlen
= sizeof(unsigned int);
389 tbl
.data
= &new_value
;
391 tbl
.data
= &net
->sctp
.rto_min
;
393 ret
= proc_dointvec(&tbl
, write
, buffer
, lenp
, ppos
);
394 if (write
&& ret
== 0) {
395 if (new_value
> max
|| new_value
< min
)
398 net
->sctp
.rto_min
= new_value
;
404 static int proc_sctp_do_rto_max(struct ctl_table
*ctl
, int write
,
405 void __user
*buffer
, size_t *lenp
,
408 struct net
*net
= current
->nsproxy
->net_ns
;
409 unsigned int min
= *(unsigned int *) ctl
->extra1
;
410 unsigned int max
= *(unsigned int *) ctl
->extra2
;
411 struct ctl_table tbl
;
414 memset(&tbl
, 0, sizeof(struct ctl_table
));
415 tbl
.maxlen
= sizeof(unsigned int);
418 tbl
.data
= &new_value
;
420 tbl
.data
= &net
->sctp
.rto_max
;
422 ret
= proc_dointvec(&tbl
, write
, buffer
, lenp
, ppos
);
423 if (write
&& ret
== 0) {
424 if (new_value
> max
|| new_value
< min
)
427 net
->sctp
.rto_max
= new_value
;
433 static int proc_sctp_do_alpha_beta(struct ctl_table
*ctl
, int write
,
434 void __user
*buffer
, size_t *lenp
,
438 pr_warn_once("Changing rto_alpha or rto_beta may lead to "
439 "suboptimal rtt/srtt estimations!\n");
441 return proc_dointvec_minmax(ctl
, write
, buffer
, lenp
, ppos
);
444 static int proc_sctp_do_auth(struct ctl_table
*ctl
, int write
,
445 void __user
*buffer
, size_t *lenp
,
448 struct net
*net
= current
->nsproxy
->net_ns
;
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
.auth_enable
;
460 ret
= proc_dointvec(&tbl
, write
, buffer
, lenp
, ppos
);
461 if (write
&& ret
== 0) {
462 struct sock
*sk
= net
->sctp
.ctl_sock
;
464 net
->sctp
.auth_enable
= new_value
;
465 /* Update the value in the control socket */
467 sctp_sk(sk
)->ep
->auth_enable
= new_value
;
474 int sctp_sysctl_net_register(struct net
*net
)
476 struct ctl_table
*table
;
479 table
= kmemdup(sctp_net_table
, sizeof(sctp_net_table
), GFP_KERNEL
);
483 for (i
= 0; table
[i
].data
; i
++)
484 table
[i
].data
+= (char *)(&net
->sctp
) - (char *)&init_net
.sctp
;
486 net
->sctp
.sysctl_header
= register_net_sysctl(net
, "net/sctp", table
);
487 if (net
->sctp
.sysctl_header
== NULL
) {
494 void sctp_sysctl_net_unregister(struct net
*net
)
496 struct ctl_table
*table
;
498 table
= net
->sctp
.sysctl_header
->ctl_table_arg
;
499 unregister_net_sysctl_table(net
->sctp
.sysctl_header
);
503 static struct ctl_table_header
*sctp_sysctl_header
;
505 /* Sysctl registration. */
506 void sctp_sysctl_register(void)
508 sctp_sysctl_header
= register_net_sysctl(&init_net
, "net/sctp", sctp_table
);
511 /* Sysctl deregistration. */
512 void sctp_sysctl_unregister(void)
514 unregister_net_sysctl_table(sctp_sysctl_header
);