xref: /linux/net/sctp/sysctl.c (revision 5bdd5fbb35ab0fe21bf2263106f51c5bee466a07)
1 /* SCTP kernel implementation
2  * (C) Copyright IBM Corp. 2002, 2004
3  * Copyright (c) 2002 Intel Corp.
4  *
5  * This file is part of the SCTP kernel implementation
6  *
7  * Sysctl related interfaces for SCTP.
8  *
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)
13  * any later version.
14  *
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.
20  *
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/>.
24  *
25  * Please send any bug reports or fixes you make to the
26  * email address(es):
27  *    lksctp developers <linux-sctp@vger.kernel.org>
28  *
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>
35  */
36 
37 #define pr_fmt(fmt) KBUILD_MODNAME ": " fmt
38 
39 #include <net/sctp/structs.h>
40 #include <net/sctp/sctp.h>
41 #include <linux/sysctl.h>
42 
43 static int zero = 0;
44 static int one = 1;
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;
55 
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;
60 
61 static int proc_sctp_do_hmac_alg(struct ctl_table *ctl, int write,
62 				void __user *buffer, size_t *lenp,
63 				loff_t *ppos);
64 static int proc_sctp_do_rto_min(struct ctl_table *ctl, int write,
65 				void __user *buffer, size_t *lenp,
66 				loff_t *ppos);
67 static int proc_sctp_do_rto_max(struct ctl_table *ctl, int write,
68 				void __user *buffer, size_t *lenp,
69 				loff_t *ppos);
70 static int proc_sctp_do_alpha_beta(struct ctl_table *ctl, int write,
71 				   void __user *buffer, size_t *lenp,
72 				   loff_t *ppos);
73 static int proc_sctp_do_auth(struct ctl_table *ctl, int write,
74 			     void __user *buffer, size_t *lenp,
75 			     loff_t *ppos);
76 
77 static struct ctl_table sctp_table[] = {
78 	{
79 		.procname	= "sctp_mem",
80 		.data		= &sysctl_sctp_mem,
81 		.maxlen		= sizeof(sysctl_sctp_mem),
82 		.mode		= 0644,
83 		.proc_handler	= proc_doulongvec_minmax
84 	},
85 	{
86 		.procname	= "sctp_rmem",
87 		.data		= &sysctl_sctp_rmem,
88 		.maxlen		= sizeof(sysctl_sctp_rmem),
89 		.mode		= 0644,
90 		.proc_handler	= proc_dointvec,
91 	},
92 	{
93 		.procname	= "sctp_wmem",
94 		.data		= &sysctl_sctp_wmem,
95 		.maxlen		= sizeof(sysctl_sctp_wmem),
96 		.mode		= 0644,
97 		.proc_handler	= proc_dointvec,
98 	},
99 
100 	{ /* sentinel */ }
101 };
102 
103 static struct ctl_table sctp_net_table[] = {
104 	{
105 		.procname	= "rto_initial",
106 		.data		= &init_net.sctp.rto_initial,
107 		.maxlen		= sizeof(unsigned int),
108 		.mode		= 0644,
109 		.proc_handler	= proc_dointvec_minmax,
110 		.extra1         = &one,
111 		.extra2         = &timer_max
112 	},
113 	{
114 		.procname	= "rto_min",
115 		.data		= &init_net.sctp.rto_min,
116 		.maxlen		= sizeof(unsigned int),
117 		.mode		= 0644,
118 		.proc_handler	= proc_sctp_do_rto_min,
119 		.extra1         = &one,
120 		.extra2         = &init_net.sctp.rto_max
121 	},
122 	{
123 		.procname	= "rto_max",
124 		.data		= &init_net.sctp.rto_max,
125 		.maxlen		= sizeof(unsigned int),
126 		.mode		= 0644,
127 		.proc_handler	= proc_sctp_do_rto_max,
128 		.extra1         = &init_net.sctp.rto_min,
129 		.extra2         = &timer_max
130 	},
131 	{
132 		.procname	= "rto_alpha_exp_divisor",
133 		.data		= &init_net.sctp.rto_alpha,
134 		.maxlen		= sizeof(int),
135 		.mode		= 0644,
136 		.proc_handler	= proc_sctp_do_alpha_beta,
137 		.extra1		= &rto_alpha_min,
138 		.extra2		= &rto_alpha_max,
139 	},
140 	{
141 		.procname	= "rto_beta_exp_divisor",
142 		.data		= &init_net.sctp.rto_beta,
143 		.maxlen		= sizeof(int),
144 		.mode		= 0644,
145 		.proc_handler	= proc_sctp_do_alpha_beta,
146 		.extra1		= &rto_beta_min,
147 		.extra2		= &rto_beta_max,
148 	},
149 	{
150 		.procname	= "max_burst",
151 		.data		= &init_net.sctp.max_burst,
152 		.maxlen		= sizeof(int),
153 		.mode		= 0644,
154 		.proc_handler	= proc_dointvec_minmax,
155 		.extra1		= &zero,
156 		.extra2		= &int_max
157 	},
158 	{
159 		.procname	= "cookie_preserve_enable",
160 		.data		= &init_net.sctp.cookie_preserve_enable,
161 		.maxlen		= sizeof(int),
162 		.mode		= 0644,
163 		.proc_handler	= proc_dointvec,
164 	},
165 	{
166 		.procname	= "cookie_hmac_alg",
167 		.data		= &init_net.sctp.sctp_hmac_alg,
168 		.maxlen		= 8,
169 		.mode		= 0644,
170 		.proc_handler	= proc_sctp_do_hmac_alg,
171 	},
172 	{
173 		.procname	= "valid_cookie_life",
174 		.data		= &init_net.sctp.valid_cookie_life,
175 		.maxlen		= sizeof(unsigned int),
176 		.mode		= 0644,
177 		.proc_handler	= proc_dointvec_minmax,
178 		.extra1         = &one,
179 		.extra2         = &timer_max
180 	},
181 	{
182 		.procname	= "sack_timeout",
183 		.data		= &init_net.sctp.sack_timeout,
184 		.maxlen		= sizeof(int),
185 		.mode		= 0644,
186 		.proc_handler	= proc_dointvec_minmax,
187 		.extra1         = &sack_timer_min,
188 		.extra2         = &sack_timer_max,
189 	},
190 	{
191 		.procname	= "hb_interval",
192 		.data		= &init_net.sctp.hb_interval,
193 		.maxlen		= sizeof(unsigned int),
194 		.mode		= 0644,
195 		.proc_handler	= proc_dointvec_minmax,
196 		.extra1         = &one,
197 		.extra2         = &timer_max
198 	},
199 	{
200 		.procname	= "association_max_retrans",
201 		.data		= &init_net.sctp.max_retrans_association,
202 		.maxlen		= sizeof(int),
203 		.mode		= 0644,
204 		.proc_handler	= proc_dointvec_minmax,
205 		.extra1		= &one,
206 		.extra2		= &int_max
207 	},
208 	{
209 		.procname	= "path_max_retrans",
210 		.data		= &init_net.sctp.max_retrans_path,
211 		.maxlen		= sizeof(int),
212 		.mode		= 0644,
213 		.proc_handler	= proc_dointvec_minmax,
214 		.extra1		= &one,
215 		.extra2		= &int_max
216 	},
217 	{
218 		.procname	= "max_init_retransmits",
219 		.data		= &init_net.sctp.max_retrans_init,
220 		.maxlen		= sizeof(int),
221 		.mode		= 0644,
222 		.proc_handler	= proc_dointvec_minmax,
223 		.extra1		= &one,
224 		.extra2		= &int_max
225 	},
226 	{
227 		.procname	= "pf_retrans",
228 		.data		= &init_net.sctp.pf_retrans,
229 		.maxlen		= sizeof(int),
230 		.mode		= 0644,
231 		.proc_handler	= proc_dointvec_minmax,
232 		.extra1		= &zero,
233 		.extra2		= &int_max
234 	},
235 	{
236 		.procname	= "sndbuf_policy",
237 		.data		= &init_net.sctp.sndbuf_policy,
238 		.maxlen		= sizeof(int),
239 		.mode		= 0644,
240 		.proc_handler	= proc_dointvec,
241 	},
242 	{
243 		.procname	= "rcvbuf_policy",
244 		.data		= &init_net.sctp.rcvbuf_policy,
245 		.maxlen		= sizeof(int),
246 		.mode		= 0644,
247 		.proc_handler	= proc_dointvec,
248 	},
249 	{
250 		.procname	= "default_auto_asconf",
251 		.data		= &init_net.sctp.default_auto_asconf,
252 		.maxlen		= sizeof(int),
253 		.mode		= 0644,
254 		.proc_handler	= proc_dointvec,
255 	},
256 	{
257 		.procname	= "addip_enable",
258 		.data		= &init_net.sctp.addip_enable,
259 		.maxlen		= sizeof(int),
260 		.mode		= 0644,
261 		.proc_handler	= proc_dointvec,
262 	},
263 	{
264 		.procname	= "addip_noauth_enable",
265 		.data		= &init_net.sctp.addip_noauth,
266 		.maxlen		= sizeof(int),
267 		.mode		= 0644,
268 		.proc_handler	= proc_dointvec,
269 	},
270 	{
271 		.procname	= "prsctp_enable",
272 		.data		= &init_net.sctp.prsctp_enable,
273 		.maxlen		= sizeof(int),
274 		.mode		= 0644,
275 		.proc_handler	= proc_dointvec,
276 	},
277 	{
278 		.procname	= "reconf_enable",
279 		.data		= &init_net.sctp.reconf_enable,
280 		.maxlen		= sizeof(int),
281 		.mode		= 0644,
282 		.proc_handler	= proc_dointvec,
283 	},
284 	{
285 		.procname	= "auth_enable",
286 		.data		= &init_net.sctp.auth_enable,
287 		.maxlen		= sizeof(int),
288 		.mode		= 0644,
289 		.proc_handler	= proc_sctp_do_auth,
290 	},
291 	{
292 		.procname	= "intl_enable",
293 		.data		= &init_net.sctp.intl_enable,
294 		.maxlen		= sizeof(int),
295 		.mode		= 0644,
296 		.proc_handler	= proc_dointvec,
297 	},
298 	{
299 		.procname	= "addr_scope_policy",
300 		.data		= &init_net.sctp.scope_policy,
301 		.maxlen		= sizeof(int),
302 		.mode		= 0644,
303 		.proc_handler	= proc_dointvec_minmax,
304 		.extra1		= &zero,
305 		.extra2		= &addr_scope_max,
306 	},
307 	{
308 		.procname	= "rwnd_update_shift",
309 		.data		= &init_net.sctp.rwnd_upd_shift,
310 		.maxlen		= sizeof(int),
311 		.mode		= 0644,
312 		.proc_handler	= &proc_dointvec_minmax,
313 		.extra1		= &one,
314 		.extra2		= &rwnd_scale_max,
315 	},
316 	{
317 		.procname	= "max_autoclose",
318 		.data		= &init_net.sctp.max_autoclose,
319 		.maxlen		= sizeof(unsigned long),
320 		.mode		= 0644,
321 		.proc_handler	= &proc_doulongvec_minmax,
322 		.extra1		= &max_autoclose_min,
323 		.extra2		= &max_autoclose_max,
324 	},
325 	{
326 		.procname	= "pf_enable",
327 		.data		= &init_net.sctp.pf_enable,
328 		.maxlen		= sizeof(int),
329 		.mode		= 0644,
330 		.proc_handler	= proc_dointvec,
331 	},
332 
333 	{ /* sentinel */ }
334 };
335 
336 static int proc_sctp_do_hmac_alg(struct ctl_table *ctl, int write,
337 				void __user *buffer, size_t *lenp,
338 				loff_t *ppos)
339 {
340 	struct net *net = current->nsproxy->net_ns;
341 	struct ctl_table tbl;
342 	bool changed = false;
343 	char *none = "none";
344 	char tmp[8] = {0};
345 	int ret;
346 
347 	memset(&tbl, 0, sizeof(struct ctl_table));
348 
349 	if (write) {
350 		tbl.data = tmp;
351 		tbl.maxlen = sizeof(tmp);
352 	} else {
353 		tbl.data = net->sctp.sctp_hmac_alg ? : none;
354 		tbl.maxlen = strlen(tbl.data);
355 	}
356 
357 	ret = proc_dostring(&tbl, write, buffer, lenp, ppos);
358 	if (write && ret == 0) {
359 #ifdef CONFIG_CRYPTO_MD5
360 		if (!strncmp(tmp, "md5", 3)) {
361 			net->sctp.sctp_hmac_alg = "md5";
362 			changed = true;
363 		}
364 #endif
365 #ifdef CONFIG_CRYPTO_SHA1
366 		if (!strncmp(tmp, "sha1", 4)) {
367 			net->sctp.sctp_hmac_alg = "sha1";
368 			changed = true;
369 		}
370 #endif
371 		if (!strncmp(tmp, "none", 4)) {
372 			net->sctp.sctp_hmac_alg = NULL;
373 			changed = true;
374 		}
375 		if (!changed)
376 			ret = -EINVAL;
377 	}
378 
379 	return ret;
380 }
381 
382 static int proc_sctp_do_rto_min(struct ctl_table *ctl, int write,
383 				void __user *buffer, size_t *lenp,
384 				loff_t *ppos)
385 {
386 	struct net *net = current->nsproxy->net_ns;
387 	unsigned int min = *(unsigned int *) ctl->extra1;
388 	unsigned int max = *(unsigned int *) ctl->extra2;
389 	struct ctl_table tbl;
390 	int ret, new_value;
391 
392 	memset(&tbl, 0, sizeof(struct ctl_table));
393 	tbl.maxlen = sizeof(unsigned int);
394 
395 	if (write)
396 		tbl.data = &new_value;
397 	else
398 		tbl.data = &net->sctp.rto_min;
399 
400 	ret = proc_dointvec(&tbl, write, buffer, lenp, ppos);
401 	if (write && ret == 0) {
402 		if (new_value > max || new_value < min)
403 			return -EINVAL;
404 
405 		net->sctp.rto_min = new_value;
406 	}
407 
408 	return ret;
409 }
410 
411 static int proc_sctp_do_rto_max(struct ctl_table *ctl, int write,
412 				void __user *buffer, size_t *lenp,
413 				loff_t *ppos)
414 {
415 	struct net *net = current->nsproxy->net_ns;
416 	unsigned int min = *(unsigned int *) ctl->extra1;
417 	unsigned int max = *(unsigned int *) ctl->extra2;
418 	struct ctl_table tbl;
419 	int ret, new_value;
420 
421 	memset(&tbl, 0, sizeof(struct ctl_table));
422 	tbl.maxlen = sizeof(unsigned int);
423 
424 	if (write)
425 		tbl.data = &new_value;
426 	else
427 		tbl.data = &net->sctp.rto_max;
428 
429 	ret = proc_dointvec(&tbl, write, buffer, lenp, ppos);
430 	if (write && ret == 0) {
431 		if (new_value > max || new_value < min)
432 			return -EINVAL;
433 
434 		net->sctp.rto_max = new_value;
435 	}
436 
437 	return ret;
438 }
439 
440 static int proc_sctp_do_alpha_beta(struct ctl_table *ctl, int write,
441 				   void __user *buffer, size_t *lenp,
442 				   loff_t *ppos)
443 {
444 	if (write)
445 		pr_warn_once("Changing rto_alpha or rto_beta may lead to "
446 			     "suboptimal rtt/srtt estimations!\n");
447 
448 	return proc_dointvec_minmax(ctl, write, buffer, lenp, ppos);
449 }
450 
451 static int proc_sctp_do_auth(struct ctl_table *ctl, int write,
452 			     void __user *buffer, size_t *lenp,
453 			     loff_t *ppos)
454 {
455 	struct net *net = current->nsproxy->net_ns;
456 	struct ctl_table tbl;
457 	int new_value, ret;
458 
459 	memset(&tbl, 0, sizeof(struct ctl_table));
460 	tbl.maxlen = sizeof(unsigned int);
461 
462 	if (write)
463 		tbl.data = &new_value;
464 	else
465 		tbl.data = &net->sctp.auth_enable;
466 
467 	ret = proc_dointvec(&tbl, write, buffer, lenp, ppos);
468 	if (write && ret == 0) {
469 		struct sock *sk = net->sctp.ctl_sock;
470 
471 		net->sctp.auth_enable = new_value;
472 		/* Update the value in the control socket */
473 		lock_sock(sk);
474 		sctp_sk(sk)->ep->auth_enable = new_value;
475 		release_sock(sk);
476 	}
477 
478 	return ret;
479 }
480 
481 int sctp_sysctl_net_register(struct net *net)
482 {
483 	struct ctl_table *table;
484 	int i;
485 
486 	table = kmemdup(sctp_net_table, sizeof(sctp_net_table), GFP_KERNEL);
487 	if (!table)
488 		return -ENOMEM;
489 
490 	for (i = 0; table[i].data; i++)
491 		table[i].data += (char *)(&net->sctp) - (char *)&init_net.sctp;
492 
493 	net->sctp.sysctl_header = register_net_sysctl(net, "net/sctp", table);
494 	if (net->sctp.sysctl_header == NULL) {
495 		kfree(table);
496 		return -ENOMEM;
497 	}
498 	return 0;
499 }
500 
501 void sctp_sysctl_net_unregister(struct net *net)
502 {
503 	struct ctl_table *table;
504 
505 	table = net->sctp.sysctl_header->ctl_table_arg;
506 	unregister_net_sysctl_table(net->sctp.sysctl_header);
507 	kfree(table);
508 }
509 
510 static struct ctl_table_header *sctp_sysctl_header;
511 
512 /* Sysctl registration.  */
513 void sctp_sysctl_register(void)
514 {
515 	sctp_sysctl_header = register_net_sysctl(&init_net, "net/sctp", sctp_table);
516 }
517 
518 /* Sysctl deregistration.  */
519 void sctp_sysctl_unregister(void)
520 {
521 	unregister_net_sysctl_table(sctp_sysctl_header);
522 }
523