xref: /linux/net/sctp/sysctl.c (revision a1ff5a7d78a036d6c2178ee5acd6ba4946243800)
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.
5  *
6  * This file is part of the SCTP kernel implementation
7  *
8  * Sysctl related interfaces for SCTP.
9  *
10  * Please send any bug reports or fixes you make to the
11  * email address(es):
12  *    lksctp developers <linux-sctp@vger.kernel.org>
13  *
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>
20  */
21 
22 #define pr_fmt(fmt) KBUILD_MODNAME ": " fmt
23 
24 #include <net/sctp/structs.h>
25 #include <net/sctp/sctp.h>
26 #include <linux/sysctl.h>
27 
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;
40 
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;
45 
46 static int proc_sctp_do_hmac_alg(const struct ctl_table *ctl, int write,
47 				 void *buffer, size_t *lenp, loff_t *ppos);
48 static int proc_sctp_do_rto_min(const struct ctl_table *ctl, int write,
49 				void *buffer, size_t *lenp, loff_t *ppos);
50 static int proc_sctp_do_rto_max(const struct ctl_table *ctl, int write, void *buffer,
51 				size_t *lenp, loff_t *ppos);
52 static int proc_sctp_do_udp_port(const struct ctl_table *ctl, int write, void *buffer,
53 				 size_t *lenp, loff_t *ppos);
54 static int proc_sctp_do_alpha_beta(const struct ctl_table *ctl, int write,
55 				   void *buffer, size_t *lenp, loff_t *ppos);
56 static int proc_sctp_do_auth(const struct ctl_table *ctl, int write,
57 			     void *buffer, size_t *lenp, loff_t *ppos);
58 static int proc_sctp_do_probe_interval(const struct ctl_table *ctl, int write,
59 				       void *buffer, size_t *lenp, loff_t *ppos);
60 
61 static struct ctl_table sctp_table[] = {
62 	{
63 		.procname	= "sctp_mem",
64 		.data		= &sysctl_sctp_mem,
65 		.maxlen		= sizeof(sysctl_sctp_mem),
66 		.mode		= 0644,
67 		.proc_handler	= proc_doulongvec_minmax
68 	},
69 	{
70 		.procname	= "sctp_rmem",
71 		.data		= &sysctl_sctp_rmem,
72 		.maxlen		= sizeof(sysctl_sctp_rmem),
73 		.mode		= 0644,
74 		.proc_handler	= proc_dointvec,
75 	},
76 	{
77 		.procname	= "sctp_wmem",
78 		.data		= &sysctl_sctp_wmem,
79 		.maxlen		= sizeof(sysctl_sctp_wmem),
80 		.mode		= 0644,
81 		.proc_handler	= proc_dointvec,
82 	},
83 };
84 
85 /* The following index defines are used in sctp_sysctl_net_register().
86  * If you add new items to the sctp_net_table, please ensure that
87  * the index values of these defines hold the same meaning indicated by
88  * their macro names when they appear in sctp_net_table.
89  */
90 #define SCTP_RTO_MIN_IDX       0
91 #define SCTP_RTO_MAX_IDX       1
92 #define SCTP_PF_RETRANS_IDX    2
93 #define SCTP_PS_RETRANS_IDX    3
94 
95 static struct ctl_table sctp_net_table[] = {
96 	[SCTP_RTO_MIN_IDX] = {
97 		.procname	= "rto_min",
98 		.data		= &init_net.sctp.rto_min,
99 		.maxlen		= sizeof(unsigned int),
100 		.mode		= 0644,
101 		.proc_handler	= proc_sctp_do_rto_min,
102 		.extra1         = SYSCTL_ONE,
103 		.extra2         = &init_net.sctp.rto_max
104 	},
105 	[SCTP_RTO_MAX_IDX] =  {
106 		.procname	= "rto_max",
107 		.data		= &init_net.sctp.rto_max,
108 		.maxlen		= sizeof(unsigned int),
109 		.mode		= 0644,
110 		.proc_handler	= proc_sctp_do_rto_max,
111 		.extra1         = &init_net.sctp.rto_min,
112 		.extra2         = &timer_max
113 	},
114 	[SCTP_PF_RETRANS_IDX] = {
115 		.procname	= "pf_retrans",
116 		.data		= &init_net.sctp.pf_retrans,
117 		.maxlen		= sizeof(int),
118 		.mode		= 0644,
119 		.proc_handler	= proc_dointvec_minmax,
120 		.extra1		= SYSCTL_ZERO,
121 		.extra2		= &init_net.sctp.ps_retrans,
122 	},
123 	[SCTP_PS_RETRANS_IDX] = {
124 		.procname	= "ps_retrans",
125 		.data		= &init_net.sctp.ps_retrans,
126 		.maxlen		= sizeof(int),
127 		.mode		= 0644,
128 		.proc_handler	= proc_dointvec_minmax,
129 		.extra1		= &init_net.sctp.pf_retrans,
130 		.extra2		= &ps_retrans_max,
131 	},
132 	{
133 		.procname	= "rto_initial",
134 		.data		= &init_net.sctp.rto_initial,
135 		.maxlen		= sizeof(unsigned int),
136 		.mode		= 0644,
137 		.proc_handler	= proc_dointvec_minmax,
138 		.extra1         = SYSCTL_ONE,
139 		.extra2         = &timer_max
140 	},
141 	{
142 		.procname	= "rto_alpha_exp_divisor",
143 		.data		= &init_net.sctp.rto_alpha,
144 		.maxlen		= sizeof(int),
145 		.mode		= 0644,
146 		.proc_handler	= proc_sctp_do_alpha_beta,
147 		.extra1		= &rto_alpha_min,
148 		.extra2		= &rto_alpha_max,
149 	},
150 	{
151 		.procname	= "rto_beta_exp_divisor",
152 		.data		= &init_net.sctp.rto_beta,
153 		.maxlen		= sizeof(int),
154 		.mode		= 0644,
155 		.proc_handler	= proc_sctp_do_alpha_beta,
156 		.extra1		= &rto_beta_min,
157 		.extra2		= &rto_beta_max,
158 	},
159 	{
160 		.procname	= "max_burst",
161 		.data		= &init_net.sctp.max_burst,
162 		.maxlen		= sizeof(int),
163 		.mode		= 0644,
164 		.proc_handler	= proc_dointvec_minmax,
165 		.extra1		= SYSCTL_ZERO,
166 		.extra2		= SYSCTL_INT_MAX,
167 	},
168 	{
169 		.procname	= "cookie_preserve_enable",
170 		.data		= &init_net.sctp.cookie_preserve_enable,
171 		.maxlen		= sizeof(int),
172 		.mode		= 0644,
173 		.proc_handler	= proc_dointvec,
174 	},
175 	{
176 		.procname	= "cookie_hmac_alg",
177 		.data		= &init_net.sctp.sctp_hmac_alg,
178 		.maxlen		= 8,
179 		.mode		= 0644,
180 		.proc_handler	= proc_sctp_do_hmac_alg,
181 	},
182 	{
183 		.procname	= "valid_cookie_life",
184 		.data		= &init_net.sctp.valid_cookie_life,
185 		.maxlen		= sizeof(unsigned int),
186 		.mode		= 0644,
187 		.proc_handler	= proc_dointvec_minmax,
188 		.extra1         = SYSCTL_ONE,
189 		.extra2         = &timer_max
190 	},
191 	{
192 		.procname	= "sack_timeout",
193 		.data		= &init_net.sctp.sack_timeout,
194 		.maxlen		= sizeof(int),
195 		.mode		= 0644,
196 		.proc_handler	= proc_dointvec_minmax,
197 		.extra1         = &sack_timer_min,
198 		.extra2         = &sack_timer_max,
199 	},
200 	{
201 		.procname	= "hb_interval",
202 		.data		= &init_net.sctp.hb_interval,
203 		.maxlen		= sizeof(unsigned int),
204 		.mode		= 0644,
205 		.proc_handler	= proc_dointvec_minmax,
206 		.extra1         = SYSCTL_ONE,
207 		.extra2         = &timer_max
208 	},
209 	{
210 		.procname	= "association_max_retrans",
211 		.data		= &init_net.sctp.max_retrans_association,
212 		.maxlen		= sizeof(int),
213 		.mode		= 0644,
214 		.proc_handler	= proc_dointvec_minmax,
215 		.extra1		= SYSCTL_ONE,
216 		.extra2		= SYSCTL_INT_MAX,
217 	},
218 	{
219 		.procname	= "path_max_retrans",
220 		.data		= &init_net.sctp.max_retrans_path,
221 		.maxlen		= sizeof(int),
222 		.mode		= 0644,
223 		.proc_handler	= proc_dointvec_minmax,
224 		.extra1		= SYSCTL_ONE,
225 		.extra2		= SYSCTL_INT_MAX,
226 	},
227 	{
228 		.procname	= "max_init_retransmits",
229 		.data		= &init_net.sctp.max_retrans_init,
230 		.maxlen		= sizeof(int),
231 		.mode		= 0644,
232 		.proc_handler	= proc_dointvec_minmax,
233 		.extra1		= SYSCTL_ONE,
234 		.extra2		= SYSCTL_INT_MAX,
235 	},
236 	{
237 		.procname	= "sndbuf_policy",
238 		.data		= &init_net.sctp.sndbuf_policy,
239 		.maxlen		= sizeof(int),
240 		.mode		= 0644,
241 		.proc_handler	= proc_dointvec,
242 	},
243 	{
244 		.procname	= "rcvbuf_policy",
245 		.data		= &init_net.sctp.rcvbuf_policy,
246 		.maxlen		= sizeof(int),
247 		.mode		= 0644,
248 		.proc_handler	= proc_dointvec,
249 	},
250 	{
251 		.procname	= "default_auto_asconf",
252 		.data		= &init_net.sctp.default_auto_asconf,
253 		.maxlen		= sizeof(int),
254 		.mode		= 0644,
255 		.proc_handler	= proc_dointvec,
256 	},
257 	{
258 		.procname	= "addip_enable",
259 		.data		= &init_net.sctp.addip_enable,
260 		.maxlen		= sizeof(int),
261 		.mode		= 0644,
262 		.proc_handler	= proc_dointvec,
263 	},
264 	{
265 		.procname	= "addip_noauth_enable",
266 		.data		= &init_net.sctp.addip_noauth,
267 		.maxlen		= sizeof(int),
268 		.mode		= 0644,
269 		.proc_handler	= proc_dointvec,
270 	},
271 	{
272 		.procname	= "prsctp_enable",
273 		.data		= &init_net.sctp.prsctp_enable,
274 		.maxlen		= sizeof(int),
275 		.mode		= 0644,
276 		.proc_handler	= proc_dointvec,
277 	},
278 	{
279 		.procname	= "reconf_enable",
280 		.data		= &init_net.sctp.reconf_enable,
281 		.maxlen		= sizeof(int),
282 		.mode		= 0644,
283 		.proc_handler	= proc_dointvec,
284 	},
285 	{
286 		.procname	= "auth_enable",
287 		.data		= &init_net.sctp.auth_enable,
288 		.maxlen		= sizeof(int),
289 		.mode		= 0644,
290 		.proc_handler	= proc_sctp_do_auth,
291 	},
292 	{
293 		.procname	= "intl_enable",
294 		.data		= &init_net.sctp.intl_enable,
295 		.maxlen		= sizeof(int),
296 		.mode		= 0644,
297 		.proc_handler	= proc_dointvec,
298 	},
299 	{
300 		.procname	= "ecn_enable",
301 		.data		= &init_net.sctp.ecn_enable,
302 		.maxlen		= sizeof(int),
303 		.mode		= 0644,
304 		.proc_handler	= proc_dointvec,
305 	},
306 	{
307 		.procname	= "plpmtud_probe_interval",
308 		.data		= &init_net.sctp.probe_interval,
309 		.maxlen		= sizeof(int),
310 		.mode		= 0644,
311 		.proc_handler	= proc_sctp_do_probe_interval,
312 	},
313 	{
314 		.procname	= "udp_port",
315 		.data		= &init_net.sctp.udp_port,
316 		.maxlen		= sizeof(int),
317 		.mode		= 0644,
318 		.proc_handler	= proc_sctp_do_udp_port,
319 		.extra1		= SYSCTL_ZERO,
320 		.extra2		= &udp_port_max,
321 	},
322 	{
323 		.procname	= "encap_port",
324 		.data		= &init_net.sctp.encap_port,
325 		.maxlen		= sizeof(int),
326 		.mode		= 0644,
327 		.proc_handler	= proc_dointvec_minmax,
328 		.extra1		= SYSCTL_ZERO,
329 		.extra2		= &udp_port_max,
330 	},
331 	{
332 		.procname	= "addr_scope_policy",
333 		.data		= &init_net.sctp.scope_policy,
334 		.maxlen		= sizeof(int),
335 		.mode		= 0644,
336 		.proc_handler	= proc_dointvec_minmax,
337 		.extra1		= SYSCTL_ZERO,
338 		.extra2		= &addr_scope_max,
339 	},
340 	{
341 		.procname	= "rwnd_update_shift",
342 		.data		= &init_net.sctp.rwnd_upd_shift,
343 		.maxlen		= sizeof(int),
344 		.mode		= 0644,
345 		.proc_handler	= &proc_dointvec_minmax,
346 		.extra1		= SYSCTL_ONE,
347 		.extra2		= &rwnd_scale_max,
348 	},
349 	{
350 		.procname	= "max_autoclose",
351 		.data		= &init_net.sctp.max_autoclose,
352 		.maxlen		= sizeof(unsigned long),
353 		.mode		= 0644,
354 		.proc_handler	= &proc_doulongvec_minmax,
355 		.extra1		= &max_autoclose_min,
356 		.extra2		= &max_autoclose_max,
357 	},
358 #ifdef CONFIG_NET_L3_MASTER_DEV
359 	{
360 		.procname	= "l3mdev_accept",
361 		.data		= &init_net.sctp.l3mdev_accept,
362 		.maxlen		= sizeof(int),
363 		.mode		= 0644,
364 		.proc_handler	= proc_dointvec_minmax,
365 		.extra1		= SYSCTL_ZERO,
366 		.extra2		= SYSCTL_ONE,
367 	},
368 #endif
369 	{
370 		.procname	= "pf_enable",
371 		.data		= &init_net.sctp.pf_enable,
372 		.maxlen		= sizeof(int),
373 		.mode		= 0644,
374 		.proc_handler	= proc_dointvec,
375 	},
376 	{
377 		.procname	= "pf_expose",
378 		.data		= &init_net.sctp.pf_expose,
379 		.maxlen		= sizeof(int),
380 		.mode		= 0644,
381 		.proc_handler	= proc_dointvec_minmax,
382 		.extra1		= SYSCTL_ZERO,
383 		.extra2		= &pf_expose_max,
384 	},
385 };
386 
proc_sctp_do_hmac_alg(const struct ctl_table * ctl,int write,void * buffer,size_t * lenp,loff_t * ppos)387 static int proc_sctp_do_hmac_alg(const struct ctl_table *ctl, int write,
388 				 void *buffer, size_t *lenp, loff_t *ppos)
389 {
390 	struct net *net = current->nsproxy->net_ns;
391 	struct ctl_table tbl;
392 	bool changed = false;
393 	char *none = "none";
394 	char tmp[8] = {0};
395 	int ret;
396 
397 	memset(&tbl, 0, sizeof(struct ctl_table));
398 
399 	if (write) {
400 		tbl.data = tmp;
401 		tbl.maxlen = sizeof(tmp);
402 	} else {
403 		tbl.data = net->sctp.sctp_hmac_alg ? : none;
404 		tbl.maxlen = strlen(tbl.data);
405 	}
406 
407 	ret = proc_dostring(&tbl, write, buffer, lenp, ppos);
408 	if (write && ret == 0) {
409 #ifdef CONFIG_CRYPTO_MD5
410 		if (!strncmp(tmp, "md5", 3)) {
411 			net->sctp.sctp_hmac_alg = "md5";
412 			changed = true;
413 		}
414 #endif
415 #ifdef CONFIG_CRYPTO_SHA1
416 		if (!strncmp(tmp, "sha1", 4)) {
417 			net->sctp.sctp_hmac_alg = "sha1";
418 			changed = true;
419 		}
420 #endif
421 		if (!strncmp(tmp, "none", 4)) {
422 			net->sctp.sctp_hmac_alg = NULL;
423 			changed = true;
424 		}
425 		if (!changed)
426 			ret = -EINVAL;
427 	}
428 
429 	return ret;
430 }
431 
proc_sctp_do_rto_min(const struct ctl_table * ctl,int write,void * buffer,size_t * lenp,loff_t * ppos)432 static int proc_sctp_do_rto_min(const struct ctl_table *ctl, int write,
433 				void *buffer, size_t *lenp, loff_t *ppos)
434 {
435 	struct net *net = current->nsproxy->net_ns;
436 	unsigned int min = *(unsigned int *) ctl->extra1;
437 	unsigned int max = *(unsigned int *) ctl->extra2;
438 	struct ctl_table tbl;
439 	int ret, new_value;
440 
441 	memset(&tbl, 0, sizeof(struct ctl_table));
442 	tbl.maxlen = sizeof(unsigned int);
443 
444 	if (write)
445 		tbl.data = &new_value;
446 	else
447 		tbl.data = &net->sctp.rto_min;
448 
449 	ret = proc_dointvec(&tbl, write, buffer, lenp, ppos);
450 	if (write && ret == 0) {
451 		if (new_value > max || new_value < min)
452 			return -EINVAL;
453 
454 		net->sctp.rto_min = new_value;
455 	}
456 
457 	return ret;
458 }
459 
proc_sctp_do_rto_max(const struct ctl_table * ctl,int write,void * buffer,size_t * lenp,loff_t * ppos)460 static int proc_sctp_do_rto_max(const struct ctl_table *ctl, int write,
461 				void *buffer, size_t *lenp, loff_t *ppos)
462 {
463 	struct net *net = current->nsproxy->net_ns;
464 	unsigned int min = *(unsigned int *) ctl->extra1;
465 	unsigned int max = *(unsigned int *) ctl->extra2;
466 	struct ctl_table tbl;
467 	int ret, new_value;
468 
469 	memset(&tbl, 0, sizeof(struct ctl_table));
470 	tbl.maxlen = sizeof(unsigned int);
471 
472 	if (write)
473 		tbl.data = &new_value;
474 	else
475 		tbl.data = &net->sctp.rto_max;
476 
477 	ret = proc_dointvec(&tbl, write, buffer, lenp, ppos);
478 	if (write && ret == 0) {
479 		if (new_value > max || new_value < min)
480 			return -EINVAL;
481 
482 		net->sctp.rto_max = new_value;
483 	}
484 
485 	return ret;
486 }
487 
proc_sctp_do_alpha_beta(const struct ctl_table * ctl,int write,void * buffer,size_t * lenp,loff_t * ppos)488 static int proc_sctp_do_alpha_beta(const struct ctl_table *ctl, int write,
489 				   void *buffer, size_t *lenp, loff_t *ppos)
490 {
491 	if (write)
492 		pr_warn_once("Changing rto_alpha or rto_beta may lead to "
493 			     "suboptimal rtt/srtt estimations!\n");
494 
495 	return proc_dointvec_minmax(ctl, write, buffer, lenp, ppos);
496 }
497 
proc_sctp_do_auth(const struct ctl_table * ctl,int write,void * buffer,size_t * lenp,loff_t * ppos)498 static int proc_sctp_do_auth(const struct ctl_table *ctl, int write,
499 			     void *buffer, size_t *lenp, loff_t *ppos)
500 {
501 	struct net *net = current->nsproxy->net_ns;
502 	struct ctl_table tbl;
503 	int new_value, ret;
504 
505 	memset(&tbl, 0, sizeof(struct ctl_table));
506 	tbl.maxlen = sizeof(unsigned int);
507 
508 	if (write)
509 		tbl.data = &new_value;
510 	else
511 		tbl.data = &net->sctp.auth_enable;
512 
513 	ret = proc_dointvec(&tbl, write, buffer, lenp, ppos);
514 	if (write && ret == 0) {
515 		struct sock *sk = net->sctp.ctl_sock;
516 
517 		net->sctp.auth_enable = new_value;
518 		/* Update the value in the control socket */
519 		lock_sock(sk);
520 		sctp_sk(sk)->ep->auth_enable = new_value;
521 		release_sock(sk);
522 	}
523 
524 	return ret;
525 }
526 
proc_sctp_do_udp_port(const struct ctl_table * ctl,int write,void * buffer,size_t * lenp,loff_t * ppos)527 static int proc_sctp_do_udp_port(const struct ctl_table *ctl, int write,
528 				 void *buffer, size_t *lenp, loff_t *ppos)
529 {
530 	struct net *net = current->nsproxy->net_ns;
531 	unsigned int min = *(unsigned int *)ctl->extra1;
532 	unsigned int max = *(unsigned int *)ctl->extra2;
533 	struct ctl_table tbl;
534 	int ret, new_value;
535 
536 	memset(&tbl, 0, sizeof(struct ctl_table));
537 	tbl.maxlen = sizeof(unsigned int);
538 
539 	if (write)
540 		tbl.data = &new_value;
541 	else
542 		tbl.data = &net->sctp.udp_port;
543 
544 	ret = proc_dointvec(&tbl, write, buffer, lenp, ppos);
545 	if (write && ret == 0) {
546 		struct sock *sk = net->sctp.ctl_sock;
547 
548 		if (new_value > max || new_value < min)
549 			return -EINVAL;
550 
551 		net->sctp.udp_port = new_value;
552 		sctp_udp_sock_stop(net);
553 		if (new_value) {
554 			ret = sctp_udp_sock_start(net);
555 			if (ret)
556 				net->sctp.udp_port = 0;
557 		}
558 
559 		/* Update the value in the control socket */
560 		lock_sock(sk);
561 		sctp_sk(sk)->udp_port = htons(net->sctp.udp_port);
562 		release_sock(sk);
563 	}
564 
565 	return ret;
566 }
567 
proc_sctp_do_probe_interval(const struct ctl_table * ctl,int write,void * buffer,size_t * lenp,loff_t * ppos)568 static int proc_sctp_do_probe_interval(const struct ctl_table *ctl, int write,
569 				       void *buffer, size_t *lenp, loff_t *ppos)
570 {
571 	struct net *net = current->nsproxy->net_ns;
572 	struct ctl_table tbl;
573 	int ret, new_value;
574 
575 	memset(&tbl, 0, sizeof(struct ctl_table));
576 	tbl.maxlen = sizeof(unsigned int);
577 
578 	if (write)
579 		tbl.data = &new_value;
580 	else
581 		tbl.data = &net->sctp.probe_interval;
582 
583 	ret = proc_dointvec(&tbl, write, buffer, lenp, ppos);
584 	if (write && ret == 0) {
585 		if (new_value && new_value < SCTP_PROBE_TIMER_MIN)
586 			return -EINVAL;
587 
588 		net->sctp.probe_interval = new_value;
589 	}
590 
591 	return ret;
592 }
593 
sctp_sysctl_net_register(struct net * net)594 int sctp_sysctl_net_register(struct net *net)
595 {
596 	size_t table_size = ARRAY_SIZE(sctp_net_table);
597 	struct ctl_table *table;
598 	int i;
599 
600 	table = kmemdup(sctp_net_table, sizeof(sctp_net_table), GFP_KERNEL);
601 	if (!table)
602 		return -ENOMEM;
603 
604 	for (i = 0; i < table_size; i++)
605 		table[i].data += (char *)(&net->sctp) - (char *)&init_net.sctp;
606 
607 	table[SCTP_RTO_MIN_IDX].extra2 = &net->sctp.rto_max;
608 	table[SCTP_RTO_MAX_IDX].extra1 = &net->sctp.rto_min;
609 	table[SCTP_PF_RETRANS_IDX].extra2 = &net->sctp.ps_retrans;
610 	table[SCTP_PS_RETRANS_IDX].extra1 = &net->sctp.pf_retrans;
611 
612 	net->sctp.sysctl_header = register_net_sysctl_sz(net, "net/sctp",
613 							 table, table_size);
614 	if (net->sctp.sysctl_header == NULL) {
615 		kfree(table);
616 		return -ENOMEM;
617 	}
618 	return 0;
619 }
620 
sctp_sysctl_net_unregister(struct net * net)621 void sctp_sysctl_net_unregister(struct net *net)
622 {
623 	const struct ctl_table *table;
624 
625 	table = net->sctp.sysctl_header->ctl_table_arg;
626 	unregister_net_sysctl_table(net->sctp.sysctl_header);
627 	kfree(table);
628 }
629 
630 static struct ctl_table_header *sctp_sysctl_header;
631 
632 /* Sysctl registration.  */
sctp_sysctl_register(void)633 void sctp_sysctl_register(void)
634 {
635 	sctp_sysctl_header = register_net_sysctl(&init_net, "net/sctp", sctp_table);
636 }
637 
638 /* Sysctl deregistration.  */
sctp_sysctl_unregister(void)639 void sctp_sysctl_unregister(void)
640 {
641 	unregister_net_sysctl_table(sctp_sysctl_header);
642 }
643