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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
28static int timer_max = 86400000; /* ms in one day */
29static int sack_timer_min = 1;
30static int sack_timer_max = 500;
31static int addr_scope_max = SCTP_SCOPE_POLICY_MAX;
32static int rwnd_scale_max = 16;
33static int rto_alpha_min = 0;
34static int rto_beta_min = 0;
35static int rto_alpha_max = 1000;
36static int rto_beta_max = 1000;
37static int pf_expose_max = SCTP_PF_EXPOSE_MAX;
38static int ps_retrans_max = SCTP_PS_RETRANS_MAX;
39static int udp_port_max = 65535;
40
41static unsigned long max_autoclose_min = 0;
42static unsigned long max_autoclose_max =
43 (MAX_SCHEDULE_TIMEOUT / HZ > UINT_MAX)
44 ? UINT_MAX : MAX_SCHEDULE_TIMEOUT / HZ;
45
46static int proc_sctp_do_hmac_alg(const struct ctl_table *ctl, int write,
47 void *buffer, size_t *lenp, loff_t *ppos);
48static int proc_sctp_do_rto_min(const struct ctl_table *ctl, int write,
49 void *buffer, size_t *lenp, loff_t *ppos);
50static int proc_sctp_do_rto_max(const struct ctl_table *ctl, int write, void *buffer,
51 size_t *lenp, loff_t *ppos);
52static int proc_sctp_do_udp_port(const struct ctl_table *ctl, int write, void *buffer,
53 size_t *lenp, loff_t *ppos);
54static int proc_sctp_do_alpha_beta(const struct ctl_table *ctl, int write,
55 void *buffer, size_t *lenp, loff_t *ppos);
56static int proc_sctp_do_auth(const struct ctl_table *ctl, int write,
57 void *buffer, size_t *lenp, loff_t *ppos);
58static int proc_sctp_do_probe_interval(const struct ctl_table *ctl, int write,
59 void *buffer, size_t *lenp, loff_t *ppos);
60
61static 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
95static 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
387static 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 = container_of(ctl->data, struct net,
391 sctp.sctp_hmac_alg);
392 struct ctl_table tbl;
393 bool changed = false;
394 char *none = "none";
395 char tmp[8] = {0};
396 int ret;
397
398 memset(&tbl, 0, sizeof(struct ctl_table));
399
400 if (write) {
401 tbl.data = tmp;
402 tbl.maxlen = sizeof(tmp);
403 } else {
404 tbl.data = net->sctp.sctp_hmac_alg ? : none;
405 tbl.maxlen = strlen(tbl.data);
406 }
407
408 ret = proc_dostring(&tbl, write, buffer, lenp, ppos);
409 if (write && ret == 0) {
410#ifdef CONFIG_CRYPTO_MD5
411 if (!strncmp(tmp, "md5", 3)) {
412 net->sctp.sctp_hmac_alg = "md5";
413 changed = true;
414 }
415#endif
416#ifdef CONFIG_CRYPTO_SHA1
417 if (!strncmp(tmp, "sha1", 4)) {
418 net->sctp.sctp_hmac_alg = "sha1";
419 changed = true;
420 }
421#endif
422 if (!strncmp(tmp, "none", 4)) {
423 net->sctp.sctp_hmac_alg = NULL;
424 changed = true;
425 }
426 if (!changed)
427 ret = -EINVAL;
428 }
429
430 return ret;
431}
432
433static int proc_sctp_do_rto_min(const struct ctl_table *ctl, int write,
434 void *buffer, size_t *lenp, loff_t *ppos)
435{
436 struct net *net = container_of(ctl->data, struct net, sctp.rto_min);
437 unsigned int min = *(unsigned int *) ctl->extra1;
438 unsigned int max = *(unsigned int *) ctl->extra2;
439 struct ctl_table tbl;
440 int ret, new_value;
441
442 memset(&tbl, 0, sizeof(struct ctl_table));
443 tbl.maxlen = sizeof(unsigned int);
444
445 if (write)
446 tbl.data = &new_value;
447 else
448 tbl.data = &net->sctp.rto_min;
449
450 ret = proc_dointvec(&tbl, write, buffer, lenp, ppos);
451 if (write && ret == 0) {
452 if (new_value > max || new_value < min)
453 return -EINVAL;
454
455 net->sctp.rto_min = new_value;
456 }
457
458 return ret;
459}
460
461static int proc_sctp_do_rto_max(const struct ctl_table *ctl, int write,
462 void *buffer, size_t *lenp, loff_t *ppos)
463{
464 struct net *net = container_of(ctl->data, struct net, sctp.rto_max);
465 unsigned int min = *(unsigned int *) ctl->extra1;
466 unsigned int max = *(unsigned int *) ctl->extra2;
467 struct ctl_table tbl;
468 int ret, new_value;
469
470 memset(&tbl, 0, sizeof(struct ctl_table));
471 tbl.maxlen = sizeof(unsigned int);
472
473 if (write)
474 tbl.data = &new_value;
475 else
476 tbl.data = &net->sctp.rto_max;
477
478 ret = proc_dointvec(&tbl, write, buffer, lenp, ppos);
479 if (write && ret == 0) {
480 if (new_value > max || new_value < min)
481 return -EINVAL;
482
483 net->sctp.rto_max = new_value;
484 }
485
486 return ret;
487}
488
489static int proc_sctp_do_alpha_beta(const struct ctl_table *ctl, int write,
490 void *buffer, size_t *lenp, loff_t *ppos)
491{
492 if (write)
493 pr_warn_once("Changing rto_alpha or rto_beta may lead to "
494 "suboptimal rtt/srtt estimations!\n");
495
496 return proc_dointvec_minmax(ctl, write, buffer, lenp, ppos);
497}
498
499static int proc_sctp_do_auth(const struct ctl_table *ctl, int write,
500 void *buffer, size_t *lenp, loff_t *ppos)
501{
502 struct net *net = container_of(ctl->data, struct net, sctp.auth_enable);
503 struct ctl_table tbl;
504 int new_value, ret;
505
506 memset(&tbl, 0, sizeof(struct ctl_table));
507 tbl.maxlen = sizeof(unsigned int);
508
509 if (write)
510 tbl.data = &new_value;
511 else
512 tbl.data = &net->sctp.auth_enable;
513
514 ret = proc_dointvec(&tbl, write, buffer, lenp, ppos);
515 if (write && ret == 0) {
516 struct sock *sk = net->sctp.ctl_sock;
517
518 net->sctp.auth_enable = new_value;
519 /* Update the value in the control socket */
520 lock_sock(sk);
521 sctp_sk(sk)->ep->auth_enable = new_value;
522 release_sock(sk);
523 }
524
525 return ret;
526}
527
528static int proc_sctp_do_udp_port(const struct ctl_table *ctl, int write,
529 void *buffer, size_t *lenp, loff_t *ppos)
530{
531 struct net *net = container_of(ctl->data, struct net, sctp.udp_port);
532 unsigned int min = *(unsigned int *)ctl->extra1;
533 unsigned int max = *(unsigned int *)ctl->extra2;
534 struct ctl_table tbl;
535 int ret, new_value;
536
537 memset(&tbl, 0, sizeof(struct ctl_table));
538 tbl.maxlen = sizeof(unsigned int);
539
540 if (write)
541 tbl.data = &new_value;
542 else
543 tbl.data = &net->sctp.udp_port;
544
545 ret = proc_dointvec(&tbl, write, buffer, lenp, ppos);
546 if (write && ret == 0) {
547 struct sock *sk = net->sctp.ctl_sock;
548
549 if (new_value > max || new_value < min)
550 return -EINVAL;
551
552 net->sctp.udp_port = new_value;
553 sctp_udp_sock_stop(net);
554 if (new_value) {
555 ret = sctp_udp_sock_start(net);
556 if (ret)
557 net->sctp.udp_port = 0;
558 }
559
560 /* Update the value in the control socket */
561 lock_sock(sk);
562 sctp_sk(sk)->udp_port = htons(net->sctp.udp_port);
563 release_sock(sk);
564 }
565
566 return ret;
567}
568
569static int proc_sctp_do_probe_interval(const struct ctl_table *ctl, int write,
570 void *buffer, size_t *lenp, loff_t *ppos)
571{
572 struct net *net = container_of(ctl->data, struct net,
573 sctp.probe_interval);
574 struct ctl_table tbl;
575 int ret, new_value;
576
577 memset(&tbl, 0, sizeof(struct ctl_table));
578 tbl.maxlen = sizeof(unsigned int);
579
580 if (write)
581 tbl.data = &new_value;
582 else
583 tbl.data = &net->sctp.probe_interval;
584
585 ret = proc_dointvec(&tbl, write, buffer, lenp, ppos);
586 if (write && ret == 0) {
587 if (new_value && new_value < SCTP_PROBE_TIMER_MIN)
588 return -EINVAL;
589
590 net->sctp.probe_interval = new_value;
591 }
592
593 return ret;
594}
595
596int sctp_sysctl_net_register(struct net *net)
597{
598 size_t table_size = ARRAY_SIZE(sctp_net_table);
599 struct ctl_table *table;
600 int i;
601
602 table = kmemdup(sctp_net_table, sizeof(sctp_net_table), GFP_KERNEL);
603 if (!table)
604 return -ENOMEM;
605
606 for (i = 0; i < table_size; i++)
607 table[i].data += (char *)(&net->sctp) - (char *)&init_net.sctp;
608
609 table[SCTP_RTO_MIN_IDX].extra2 = &net->sctp.rto_max;
610 table[SCTP_RTO_MAX_IDX].extra1 = &net->sctp.rto_min;
611 table[SCTP_PF_RETRANS_IDX].extra2 = &net->sctp.ps_retrans;
612 table[SCTP_PS_RETRANS_IDX].extra1 = &net->sctp.pf_retrans;
613
614 net->sctp.sysctl_header = register_net_sysctl_sz(net, "net/sctp",
615 table, table_size);
616 if (net->sctp.sysctl_header == NULL) {
617 kfree(table);
618 return -ENOMEM;
619 }
620 return 0;
621}
622
623void sctp_sysctl_net_unregister(struct net *net)
624{
625 const struct ctl_table *table;
626
627 table = net->sctp.sysctl_header->ctl_table_arg;
628 unregister_net_sysctl_table(net->sctp.sysctl_header);
629 kfree(table);
630}
631
632static struct ctl_table_header *sctp_sysctl_header;
633
634/* Sysctl registration. */
635void sctp_sysctl_register(void)
636{
637 sctp_sysctl_header = register_net_sysctl(&init_net, "net/sctp", sctp_table);
638}
639
640/* Sysctl deregistration. */
641void sctp_sysctl_unregister(void)
642{
643 unregister_net_sysctl_table(sctp_sysctl_header);
644}
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
43static int zero = 0;
44static int one = 1;
45static int timer_max = 86400000; /* ms in one day */
46static int int_max = INT_MAX;
47static int sack_timer_min = 1;
48static int sack_timer_max = 500;
49static int addr_scope_max = 3; /* check sctp_scope_policy_t in include/net/sctp/constants.h for max entries */
50static int rwnd_scale_max = 16;
51static int rto_alpha_min = 0;
52static int rto_beta_min = 0;
53static int rto_alpha_max = 1000;
54static int rto_beta_max = 1000;
55
56static unsigned long max_autoclose_min = 0;
57static unsigned long max_autoclose_max =
58 (MAX_SCHEDULE_TIMEOUT / HZ > UINT_MAX)
59 ? UINT_MAX : MAX_SCHEDULE_TIMEOUT / HZ;
60
61static int proc_sctp_do_hmac_alg(struct ctl_table *ctl, int write,
62 void __user *buffer, size_t *lenp,
63 loff_t *ppos);
64static int proc_sctp_do_rto_min(struct ctl_table *ctl, int write,
65 void __user *buffer, size_t *lenp,
66 loff_t *ppos);
67static int proc_sctp_do_rto_max(struct ctl_table *ctl, int write,
68 void __user *buffer, size_t *lenp,
69 loff_t *ppos);
70static int proc_sctp_do_alpha_beta(struct ctl_table *ctl, int write,
71 void __user *buffer, size_t *lenp,
72 loff_t *ppos);
73static int proc_sctp_do_auth(struct ctl_table *ctl, int write,
74 void __user *buffer, size_t *lenp,
75 loff_t *ppos);
76
77static 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
103static 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 = "auth_enable",
279 .data = &init_net.sctp.auth_enable,
280 .maxlen = sizeof(int),
281 .mode = 0644,
282 .proc_handler = proc_sctp_do_auth,
283 },
284 {
285 .procname = "addr_scope_policy",
286 .data = &init_net.sctp.scope_policy,
287 .maxlen = sizeof(int),
288 .mode = 0644,
289 .proc_handler = proc_dointvec_minmax,
290 .extra1 = &zero,
291 .extra2 = &addr_scope_max,
292 },
293 {
294 .procname = "rwnd_update_shift",
295 .data = &init_net.sctp.rwnd_upd_shift,
296 .maxlen = sizeof(int),
297 .mode = 0644,
298 .proc_handler = &proc_dointvec_minmax,
299 .extra1 = &one,
300 .extra2 = &rwnd_scale_max,
301 },
302 {
303 .procname = "max_autoclose",
304 .data = &init_net.sctp.max_autoclose,
305 .maxlen = sizeof(unsigned long),
306 .mode = 0644,
307 .proc_handler = &proc_doulongvec_minmax,
308 .extra1 = &max_autoclose_min,
309 .extra2 = &max_autoclose_max,
310 },
311 {
312 .procname = "pf_enable",
313 .data = &init_net.sctp.pf_enable,
314 .maxlen = sizeof(int),
315 .mode = 0644,
316 .proc_handler = proc_dointvec,
317 },
318
319 { /* sentinel */ }
320};
321
322static int proc_sctp_do_hmac_alg(struct ctl_table *ctl, int write,
323 void __user *buffer, size_t *lenp,
324 loff_t *ppos)
325{
326 struct net *net = current->nsproxy->net_ns;
327 struct ctl_table tbl;
328 bool changed = false;
329 char *none = "none";
330 char tmp[8] = {0};
331 int ret;
332
333 memset(&tbl, 0, sizeof(struct ctl_table));
334
335 if (write) {
336 tbl.data = tmp;
337 tbl.maxlen = sizeof(tmp);
338 } else {
339 tbl.data = net->sctp.sctp_hmac_alg ? : none;
340 tbl.maxlen = strlen(tbl.data);
341 }
342
343 ret = proc_dostring(&tbl, write, buffer, lenp, ppos);
344 if (write && ret == 0) {
345#ifdef CONFIG_CRYPTO_MD5
346 if (!strncmp(tmp, "md5", 3)) {
347 net->sctp.sctp_hmac_alg = "md5";
348 changed = true;
349 }
350#endif
351#ifdef CONFIG_CRYPTO_SHA1
352 if (!strncmp(tmp, "sha1", 4)) {
353 net->sctp.sctp_hmac_alg = "sha1";
354 changed = true;
355 }
356#endif
357 if (!strncmp(tmp, "none", 4)) {
358 net->sctp.sctp_hmac_alg = NULL;
359 changed = true;
360 }
361 if (!changed)
362 ret = -EINVAL;
363 }
364
365 return ret;
366}
367
368static int proc_sctp_do_rto_min(struct ctl_table *ctl, int write,
369 void __user *buffer, size_t *lenp,
370 loff_t *ppos)
371{
372 struct net *net = current->nsproxy->net_ns;
373 unsigned int min = *(unsigned int *) ctl->extra1;
374 unsigned int max = *(unsigned int *) ctl->extra2;
375 struct ctl_table tbl;
376 int ret, new_value;
377
378 memset(&tbl, 0, sizeof(struct ctl_table));
379 tbl.maxlen = sizeof(unsigned int);
380
381 if (write)
382 tbl.data = &new_value;
383 else
384 tbl.data = &net->sctp.rto_min;
385
386 ret = proc_dointvec(&tbl, write, buffer, lenp, ppos);
387 if (write && ret == 0) {
388 if (new_value > max || new_value < min)
389 return -EINVAL;
390
391 net->sctp.rto_min = new_value;
392 }
393
394 return ret;
395}
396
397static int proc_sctp_do_rto_max(struct ctl_table *ctl, int write,
398 void __user *buffer, size_t *lenp,
399 loff_t *ppos)
400{
401 struct net *net = current->nsproxy->net_ns;
402 unsigned int min = *(unsigned int *) ctl->extra1;
403 unsigned int max = *(unsigned int *) ctl->extra2;
404 struct ctl_table tbl;
405 int ret, new_value;
406
407 memset(&tbl, 0, sizeof(struct ctl_table));
408 tbl.maxlen = sizeof(unsigned int);
409
410 if (write)
411 tbl.data = &new_value;
412 else
413 tbl.data = &net->sctp.rto_max;
414
415 ret = proc_dointvec(&tbl, write, buffer, lenp, ppos);
416 if (write && ret == 0) {
417 if (new_value > max || new_value < min)
418 return -EINVAL;
419
420 net->sctp.rto_max = new_value;
421 }
422
423 return ret;
424}
425
426static int proc_sctp_do_alpha_beta(struct ctl_table *ctl, int write,
427 void __user *buffer, size_t *lenp,
428 loff_t *ppos)
429{
430 if (write)
431 pr_warn_once("Changing rto_alpha or rto_beta may lead to "
432 "suboptimal rtt/srtt estimations!\n");
433
434 return proc_dointvec_minmax(ctl, write, buffer, lenp, ppos);
435}
436
437static int proc_sctp_do_auth(struct ctl_table *ctl, int write,
438 void __user *buffer, size_t *lenp,
439 loff_t *ppos)
440{
441 struct net *net = current->nsproxy->net_ns;
442 struct ctl_table tbl;
443 int new_value, ret;
444
445 memset(&tbl, 0, sizeof(struct ctl_table));
446 tbl.maxlen = sizeof(unsigned int);
447
448 if (write)
449 tbl.data = &new_value;
450 else
451 tbl.data = &net->sctp.auth_enable;
452
453 ret = proc_dointvec(&tbl, write, buffer, lenp, ppos);
454 if (write && ret == 0) {
455 struct sock *sk = net->sctp.ctl_sock;
456
457 net->sctp.auth_enable = new_value;
458 /* Update the value in the control socket */
459 lock_sock(sk);
460 sctp_sk(sk)->ep->auth_enable = new_value;
461 release_sock(sk);
462 }
463
464 return ret;
465}
466
467int sctp_sysctl_net_register(struct net *net)
468{
469 struct ctl_table *table;
470 int i;
471
472 table = kmemdup(sctp_net_table, sizeof(sctp_net_table), GFP_KERNEL);
473 if (!table)
474 return -ENOMEM;
475
476 for (i = 0; table[i].data; i++)
477 table[i].data += (char *)(&net->sctp) - (char *)&init_net.sctp;
478
479 net->sctp.sysctl_header = register_net_sysctl(net, "net/sctp", table);
480 if (net->sctp.sysctl_header == NULL) {
481 kfree(table);
482 return -ENOMEM;
483 }
484 return 0;
485}
486
487void sctp_sysctl_net_unregister(struct net *net)
488{
489 struct ctl_table *table;
490
491 table = net->sctp.sysctl_header->ctl_table_arg;
492 unregister_net_sysctl_table(net->sctp.sysctl_header);
493 kfree(table);
494}
495
496static struct ctl_table_header *sctp_sysctl_header;
497
498/* Sysctl registration. */
499void sctp_sysctl_register(void)
500{
501 sctp_sysctl_header = register_net_sysctl(&init_net, "net/sctp", sctp_table);
502}
503
504/* Sysctl deregistration. */
505void sctp_sysctl_unregister(void)
506{
507 unregister_net_sysctl_table(sctp_sysctl_header);
508}