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
= 3; /* check sctp_scope_policy_t in include/net/sctp/constants.h for max entries */
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
= "auth_enable",
279 .data
= &init_net
.sctp
.auth_enable
,
280 .maxlen
= sizeof(int),
282 .proc_handler
= proc_sctp_do_auth
,
285 .procname
= "addr_scope_policy",
286 .data
= &init_net
.sctp
.scope_policy
,
287 .maxlen
= sizeof(int),
289 .proc_handler
= proc_dointvec_minmax
,
291 .extra2
= &addr_scope_max
,
294 .procname
= "rwnd_update_shift",
295 .data
= &init_net
.sctp
.rwnd_upd_shift
,
296 .maxlen
= sizeof(int),
298 .proc_handler
= &proc_dointvec_minmax
,
300 .extra2
= &rwnd_scale_max
,
303 .procname
= "max_autoclose",
304 .data
= &init_net
.sctp
.max_autoclose
,
305 .maxlen
= sizeof(unsigned long),
307 .proc_handler
= &proc_doulongvec_minmax
,
308 .extra1
= &max_autoclose_min
,
309 .extra2
= &max_autoclose_max
,
315 static int proc_sctp_do_hmac_alg(struct ctl_table
*ctl
, int write
,
316 void __user
*buffer
, size_t *lenp
,
319 struct net
*net
= current
->nsproxy
->net_ns
;
320 struct ctl_table tbl
;
321 bool changed
= false;
326 memset(&tbl
, 0, sizeof(struct ctl_table
));
330 tbl
.maxlen
= sizeof(tmp
);
332 tbl
.data
= net
->sctp
.sctp_hmac_alg
? : none
;
333 tbl
.maxlen
= strlen(tbl
.data
);
336 ret
= proc_dostring(&tbl
, write
, buffer
, lenp
, ppos
);
337 if (write
&& ret
== 0) {
338 #ifdef CONFIG_CRYPTO_MD5
339 if (!strncmp(tmp
, "md5", 3)) {
340 net
->sctp
.sctp_hmac_alg
= "md5";
344 #ifdef CONFIG_CRYPTO_SHA1
345 if (!strncmp(tmp
, "sha1", 4)) {
346 net
->sctp
.sctp_hmac_alg
= "sha1";
350 if (!strncmp(tmp
, "none", 4)) {
351 net
->sctp
.sctp_hmac_alg
= NULL
;
361 static int proc_sctp_do_rto_min(struct ctl_table
*ctl
, int write
,
362 void __user
*buffer
, size_t *lenp
,
365 struct net
*net
= current
->nsproxy
->net_ns
;
366 unsigned int min
= *(unsigned int *) ctl
->extra1
;
367 unsigned int max
= *(unsigned int *) ctl
->extra2
;
368 struct ctl_table tbl
;
371 memset(&tbl
, 0, sizeof(struct ctl_table
));
372 tbl
.maxlen
= sizeof(unsigned int);
375 tbl
.data
= &new_value
;
377 tbl
.data
= &net
->sctp
.rto_min
;
379 ret
= proc_dointvec(&tbl
, write
, buffer
, lenp
, ppos
);
380 if (write
&& ret
== 0) {
381 if (new_value
> max
|| new_value
< min
)
384 net
->sctp
.rto_min
= new_value
;
390 static int proc_sctp_do_rto_max(struct ctl_table
*ctl
, int write
,
391 void __user
*buffer
, size_t *lenp
,
394 struct net
*net
= current
->nsproxy
->net_ns
;
395 unsigned int min
= *(unsigned int *) ctl
->extra1
;
396 unsigned int max
= *(unsigned int *) ctl
->extra2
;
397 struct ctl_table tbl
;
400 memset(&tbl
, 0, sizeof(struct ctl_table
));
401 tbl
.maxlen
= sizeof(unsigned int);
404 tbl
.data
= &new_value
;
406 tbl
.data
= &net
->sctp
.rto_max
;
408 ret
= proc_dointvec(&tbl
, write
, buffer
, lenp
, ppos
);
409 if (write
&& ret
== 0) {
410 if (new_value
> max
|| new_value
< min
)
413 net
->sctp
.rto_max
= new_value
;
419 static int proc_sctp_do_alpha_beta(struct ctl_table
*ctl
, int write
,
420 void __user
*buffer
, size_t *lenp
,
424 pr_warn_once("Changing rto_alpha or rto_beta may lead to "
425 "suboptimal rtt/srtt estimations!\n");
427 return proc_dointvec_minmax(ctl
, write
, buffer
, lenp
, ppos
);
430 static int proc_sctp_do_auth(struct ctl_table
*ctl
, int write
,
431 void __user
*buffer
, size_t *lenp
,
434 struct net
*net
= current
->nsproxy
->net_ns
;
435 struct ctl_table tbl
;
438 memset(&tbl
, 0, sizeof(struct ctl_table
));
439 tbl
.maxlen
= sizeof(unsigned int);
442 tbl
.data
= &new_value
;
444 tbl
.data
= &net
->sctp
.auth_enable
;
446 ret
= proc_dointvec(&tbl
, write
, buffer
, lenp
, ppos
);
447 if (write
&& ret
== 0) {
448 struct sock
*sk
= net
->sctp
.ctl_sock
;
450 net
->sctp
.auth_enable
= new_value
;
451 /* Update the value in the control socket */
453 sctp_sk(sk
)->ep
->auth_enable
= new_value
;
460 int sctp_sysctl_net_register(struct net
*net
)
462 struct ctl_table
*table
;
465 table
= kmemdup(sctp_net_table
, sizeof(sctp_net_table
), GFP_KERNEL
);
469 for (i
= 0; table
[i
].data
; i
++)
470 table
[i
].data
+= (char *)(&net
->sctp
) - (char *)&init_net
.sctp
;
472 net
->sctp
.sysctl_header
= register_net_sysctl(net
, "net/sctp", table
);
473 if (net
->sctp
.sysctl_header
== NULL
) {
480 void sctp_sysctl_net_unregister(struct net
*net
)
482 struct ctl_table
*table
;
484 table
= net
->sctp
.sysctl_header
->ctl_table_arg
;
485 unregister_net_sysctl_table(net
->sctp
.sysctl_header
);
489 static struct ctl_table_header
*sctp_sysctl_header
;
491 /* Sysctl registration. */
492 void sctp_sysctl_register(void)
494 sctp_sysctl_header
= register_net_sysctl(&init_net
, "net/sctp", sctp_table
);
497 /* Sysctl deregistration. */
498 void sctp_sysctl_unregister(void)
500 unregister_net_sysctl_table(sctp_sysctl_header
);
This page took 0.041014 seconds and 6 git commands to generate.