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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 <[email protected]>
13 *
14 * Written or modified by:
15 * Mingqin Liu <[email protected]>
16 * Jon Grimm <[email protected]>
17 * Ardelle Fan <[email protected]>
18 * Ryan Layer <[email protected]>
19 * Sridhar Samudrala <[email protected]>
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 const 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.cookie_auth_enable,
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.cookie_auth_enable);
392 struct ctl_table tbl;
393 char tmp[8] = {0};
394 int ret;
395
396 memset(&tbl, 0, sizeof(struct ctl_table));
397
398 if (write) {
399 tbl.data = tmp;
400 tbl.maxlen = sizeof(tmp) - 1;
401 ret = proc_dostring(&tbl, 1, buffer, lenp, ppos);
402 if (ret)
403 return ret;
404 if (!strcmp(tmp, "sha256")) {
405 net->sctp.cookie_auth_enable = 1;
406 return 0;
407 }
408 if (!strcmp(tmp, "none")) {
409 net->sctp.cookie_auth_enable = 0;
410 return 0;
411 }
412 return -EINVAL;
413 }
414 if (net->sctp.cookie_auth_enable)
415 tbl.data = (char *)"sha256";
416 else
417 tbl.data = (char *)"none";
418 tbl.maxlen = strlen(tbl.data);
419 return proc_dostring(&tbl, 0, buffer, lenp, ppos);
420}
421
422static int proc_sctp_do_rto_min(const struct ctl_table *ctl, int write,
423 void *buffer, size_t *lenp, loff_t *ppos)
424{
425 struct net *net = container_of(ctl->data, struct net, sctp.rto_min);
426 unsigned int min = *(unsigned int *) ctl->extra1;
427 unsigned int max = *(unsigned int *) ctl->extra2;
428 struct ctl_table tbl;
429 int ret, new_value;
430
431 memset(&tbl, 0, sizeof(struct ctl_table));
432 tbl.maxlen = sizeof(unsigned int);
433
434 if (write)
435 tbl.data = &new_value;
436 else
437 tbl.data = &net->sctp.rto_min;
438
439 ret = proc_dointvec(&tbl, write, buffer, lenp, ppos);
440 if (write && ret == 0) {
441 if (new_value > max || new_value < min)
442 return -EINVAL;
443
444 net->sctp.rto_min = new_value;
445 }
446
447 return ret;
448}
449
450static int proc_sctp_do_rto_max(const struct ctl_table *ctl, int write,
451 void *buffer, size_t *lenp, loff_t *ppos)
452{
453 struct net *net = container_of(ctl->data, struct net, sctp.rto_max);
454 unsigned int min = *(unsigned int *) ctl->extra1;
455 unsigned int max = *(unsigned int *) ctl->extra2;
456 struct ctl_table tbl;
457 int ret, new_value;
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.rto_max;
466
467 ret = proc_dointvec(&tbl, write, buffer, lenp, ppos);
468 if (write && ret == 0) {
469 if (new_value > max || new_value < min)
470 return -EINVAL;
471
472 net->sctp.rto_max = new_value;
473 }
474
475 return ret;
476}
477
478static int proc_sctp_do_alpha_beta(const struct ctl_table *ctl, int write,
479 void *buffer, size_t *lenp, loff_t *ppos)
480{
481 if (write)
482 pr_warn_once("Changing rto_alpha or rto_beta may lead to "
483 "suboptimal rtt/srtt estimations!\n");
484
485 return proc_dointvec_minmax(ctl, write, buffer, lenp, ppos);
486}
487
488static int proc_sctp_do_auth(const struct ctl_table *ctl, int write,
489 void *buffer, size_t *lenp, loff_t *ppos)
490{
491 struct net *net = container_of(ctl->data, struct net, sctp.auth_enable);
492 struct ctl_table tbl;
493 int new_value, ret;
494
495 memset(&tbl, 0, sizeof(struct ctl_table));
496 tbl.maxlen = sizeof(unsigned int);
497
498 if (write)
499 tbl.data = &new_value;
500 else
501 tbl.data = &net->sctp.auth_enable;
502
503 ret = proc_dointvec(&tbl, write, buffer, lenp, ppos);
504 if (write && ret == 0) {
505 struct sock *sk = net->sctp.ctl_sock;
506
507 net->sctp.auth_enable = new_value;
508 /* Update the value in the control socket */
509 lock_sock(sk);
510 sctp_sk(sk)->ep->auth_enable = new_value;
511 release_sock(sk);
512 }
513
514 return ret;
515}
516
517static DEFINE_MUTEX(sctp_sysctl_mutex);
518
519static int proc_sctp_do_udp_port(const struct ctl_table *ctl, int write,
520 void *buffer, size_t *lenp, loff_t *ppos)
521{
522 struct net *net = container_of(ctl->data, struct net, sctp.udp_port);
523 unsigned int min = *(unsigned int *)ctl->extra1;
524 unsigned int max = *(unsigned int *)ctl->extra2;
525 struct ctl_table tbl;
526 int ret, new_value;
527
528 memset(&tbl, 0, sizeof(struct ctl_table));
529 tbl.maxlen = sizeof(unsigned int);
530
531 if (write)
532 tbl.data = &new_value;
533 else
534 tbl.data = &net->sctp.udp_port;
535
536 ret = proc_dointvec(&tbl, write, buffer, lenp, ppos);
537 if (write && ret == 0) {
538 struct sock *sk = net->sctp.ctl_sock;
539
540 if (new_value > max || new_value < min)
541 return -EINVAL;
542
543 mutex_lock(&sctp_sysctl_mutex);
544 net->sctp.udp_port = new_value;
545 sctp_udp_sock_stop(net);
546 if (new_value) {
547 ret = sctp_udp_sock_start(net);
548 if (ret)
549 net->sctp.udp_port = 0;
550 }
551
552 /* Update the value in the control socket */
553 lock_sock(sk);
554 sctp_sk(sk)->udp_port = htons(net->sctp.udp_port);
555 release_sock(sk);
556 mutex_unlock(&sctp_sysctl_mutex);
557 }
558
559 return ret;
560}
561
562static int proc_sctp_do_probe_interval(const struct ctl_table *ctl, int write,
563 void *buffer, size_t *lenp, loff_t *ppos)
564{
565 struct net *net = container_of(ctl->data, struct net,
566 sctp.probe_interval);
567 struct ctl_table tbl;
568 int ret, new_value;
569
570 memset(&tbl, 0, sizeof(struct ctl_table));
571 tbl.maxlen = sizeof(unsigned int);
572
573 if (write)
574 tbl.data = &new_value;
575 else
576 tbl.data = &net->sctp.probe_interval;
577
578 ret = proc_dointvec(&tbl, write, buffer, lenp, ppos);
579 if (write && ret == 0) {
580 if (new_value && new_value < SCTP_PROBE_TIMER_MIN)
581 return -EINVAL;
582
583 net->sctp.probe_interval = new_value;
584 }
585
586 return ret;
587}
588
589int sctp_sysctl_net_register(struct net *net)
590{
591 size_t table_size = ARRAY_SIZE(sctp_net_table);
592 struct ctl_table *table;
593 int i;
594
595 table = kmemdup(sctp_net_table, sizeof(sctp_net_table), GFP_KERNEL);
596 if (!table)
597 return -ENOMEM;
598
599 for (i = 0; i < table_size; i++)
600 table[i].data += (char *)(&net->sctp) - (char *)&init_net.sctp;
601
602 table[SCTP_RTO_MIN_IDX].extra2 = &net->sctp.rto_max;
603 table[SCTP_RTO_MAX_IDX].extra1 = &net->sctp.rto_min;
604 table[SCTP_PF_RETRANS_IDX].extra2 = &net->sctp.ps_retrans;
605 table[SCTP_PS_RETRANS_IDX].extra1 = &net->sctp.pf_retrans;
606
607 net->sctp.sysctl_header = register_net_sysctl_sz(net, "net/sctp",
608 table, table_size);
609 if (net->sctp.sysctl_header == NULL) {
610 kfree(table);
611 return -ENOMEM;
612 }
613 return 0;
614}
615
616void sctp_sysctl_net_unregister(struct net *net)
617{
618 struct ctl_table_header *header = net->sctp.sysctl_header;
619 const struct ctl_table *table;
620
621 if (!header)
622 return;
623
624 table = header->ctl_table_arg;
625 unregister_net_sysctl_table(header);
626 kfree(table);
627 net->sctp.sysctl_header = NULL;
628}
629
630static struct ctl_table_header *sctp_sysctl_header;
631
632/* Sysctl registration. */
633void sctp_sysctl_register(void)
634{
635 sctp_sysctl_header = register_net_sysctl(&init_net, "net/sctp", sctp_table);
636}
637
638/* Sysctl deregistration. */
639void sctp_sysctl_unregister(void)
640{
641 unregister_net_sysctl_table(sctp_sysctl_header);
642}