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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// 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(struct ctl_table *ctl, int write,
47 void *buffer, size_t *lenp, loff_t *ppos);
48static int proc_sctp_do_rto_min(struct ctl_table *ctl, int write,
49 void *buffer, size_t *lenp, loff_t *ppos);
50static int proc_sctp_do_rto_max(struct ctl_table *ctl, int write, void *buffer,
51 size_t *lenp, loff_t *ppos);
52static int proc_sctp_do_udp_port(struct ctl_table *ctl, int write, void *buffer,
53 size_t *lenp, loff_t *ppos);
54static int proc_sctp_do_alpha_beta(struct ctl_table *ctl, int write,
55 void *buffer, size_t *lenp, loff_t *ppos);
56static int proc_sctp_do_auth(struct ctl_table *ctl, int write,
57 void *buffer, size_t *lenp, loff_t *ppos);
58static int proc_sctp_do_probe_interval(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 { /* sentinel */ }
85};
86
87/* The following index defines are used in sctp_sysctl_net_register().
88 * If you add new items to the sctp_net_table, please ensure that
89 * the index values of these defines hold the same meaning indicated by
90 * their macro names when they appear in sctp_net_table.
91 */
92#define SCTP_RTO_MIN_IDX 0
93#define SCTP_RTO_MAX_IDX 1
94#define SCTP_PF_RETRANS_IDX 2
95#define SCTP_PS_RETRANS_IDX 3
96
97static struct ctl_table sctp_net_table[] = {
98 [SCTP_RTO_MIN_IDX] = {
99 .procname = "rto_min",
100 .data = &init_net.sctp.rto_min,
101 .maxlen = sizeof(unsigned int),
102 .mode = 0644,
103 .proc_handler = proc_sctp_do_rto_min,
104 .extra1 = SYSCTL_ONE,
105 .extra2 = &init_net.sctp.rto_max
106 },
107 [SCTP_RTO_MAX_IDX] = {
108 .procname = "rto_max",
109 .data = &init_net.sctp.rto_max,
110 .maxlen = sizeof(unsigned int),
111 .mode = 0644,
112 .proc_handler = proc_sctp_do_rto_max,
113 .extra1 = &init_net.sctp.rto_min,
114 .extra2 = &timer_max
115 },
116 [SCTP_PF_RETRANS_IDX] = {
117 .procname = "pf_retrans",
118 .data = &init_net.sctp.pf_retrans,
119 .maxlen = sizeof(int),
120 .mode = 0644,
121 .proc_handler = proc_dointvec_minmax,
122 .extra1 = SYSCTL_ZERO,
123 .extra2 = &init_net.sctp.ps_retrans,
124 },
125 [SCTP_PS_RETRANS_IDX] = {
126 .procname = "ps_retrans",
127 .data = &init_net.sctp.ps_retrans,
128 .maxlen = sizeof(int),
129 .mode = 0644,
130 .proc_handler = proc_dointvec_minmax,
131 .extra1 = &init_net.sctp.pf_retrans,
132 .extra2 = &ps_retrans_max,
133 },
134 {
135 .procname = "rto_initial",
136 .data = &init_net.sctp.rto_initial,
137 .maxlen = sizeof(unsigned int),
138 .mode = 0644,
139 .proc_handler = proc_dointvec_minmax,
140 .extra1 = SYSCTL_ONE,
141 .extra2 = &timer_max
142 },
143 {
144 .procname = "rto_alpha_exp_divisor",
145 .data = &init_net.sctp.rto_alpha,
146 .maxlen = sizeof(int),
147 .mode = 0644,
148 .proc_handler = proc_sctp_do_alpha_beta,
149 .extra1 = &rto_alpha_min,
150 .extra2 = &rto_alpha_max,
151 },
152 {
153 .procname = "rto_beta_exp_divisor",
154 .data = &init_net.sctp.rto_beta,
155 .maxlen = sizeof(int),
156 .mode = 0644,
157 .proc_handler = proc_sctp_do_alpha_beta,
158 .extra1 = &rto_beta_min,
159 .extra2 = &rto_beta_max,
160 },
161 {
162 .procname = "max_burst",
163 .data = &init_net.sctp.max_burst,
164 .maxlen = sizeof(int),
165 .mode = 0644,
166 .proc_handler = proc_dointvec_minmax,
167 .extra1 = SYSCTL_ZERO,
168 .extra2 = SYSCTL_INT_MAX,
169 },
170 {
171 .procname = "cookie_preserve_enable",
172 .data = &init_net.sctp.cookie_preserve_enable,
173 .maxlen = sizeof(int),
174 .mode = 0644,
175 .proc_handler = proc_dointvec,
176 },
177 {
178 .procname = "cookie_hmac_alg",
179 .data = &init_net.sctp.sctp_hmac_alg,
180 .maxlen = 8,
181 .mode = 0644,
182 .proc_handler = proc_sctp_do_hmac_alg,
183 },
184 {
185 .procname = "valid_cookie_life",
186 .data = &init_net.sctp.valid_cookie_life,
187 .maxlen = sizeof(unsigned int),
188 .mode = 0644,
189 .proc_handler = proc_dointvec_minmax,
190 .extra1 = SYSCTL_ONE,
191 .extra2 = &timer_max
192 },
193 {
194 .procname = "sack_timeout",
195 .data = &init_net.sctp.sack_timeout,
196 .maxlen = sizeof(int),
197 .mode = 0644,
198 .proc_handler = proc_dointvec_minmax,
199 .extra1 = &sack_timer_min,
200 .extra2 = &sack_timer_max,
201 },
202 {
203 .procname = "hb_interval",
204 .data = &init_net.sctp.hb_interval,
205 .maxlen = sizeof(unsigned int),
206 .mode = 0644,
207 .proc_handler = proc_dointvec_minmax,
208 .extra1 = SYSCTL_ONE,
209 .extra2 = &timer_max
210 },
211 {
212 .procname = "association_max_retrans",
213 .data = &init_net.sctp.max_retrans_association,
214 .maxlen = sizeof(int),
215 .mode = 0644,
216 .proc_handler = proc_dointvec_minmax,
217 .extra1 = SYSCTL_ONE,
218 .extra2 = SYSCTL_INT_MAX,
219 },
220 {
221 .procname = "path_max_retrans",
222 .data = &init_net.sctp.max_retrans_path,
223 .maxlen = sizeof(int),
224 .mode = 0644,
225 .proc_handler = proc_dointvec_minmax,
226 .extra1 = SYSCTL_ONE,
227 .extra2 = SYSCTL_INT_MAX,
228 },
229 {
230 .procname = "max_init_retransmits",
231 .data = &init_net.sctp.max_retrans_init,
232 .maxlen = sizeof(int),
233 .mode = 0644,
234 .proc_handler = proc_dointvec_minmax,
235 .extra1 = SYSCTL_ONE,
236 .extra2 = SYSCTL_INT_MAX,
237 },
238 {
239 .procname = "sndbuf_policy",
240 .data = &init_net.sctp.sndbuf_policy,
241 .maxlen = sizeof(int),
242 .mode = 0644,
243 .proc_handler = proc_dointvec,
244 },
245 {
246 .procname = "rcvbuf_policy",
247 .data = &init_net.sctp.rcvbuf_policy,
248 .maxlen = sizeof(int),
249 .mode = 0644,
250 .proc_handler = proc_dointvec,
251 },
252 {
253 .procname = "default_auto_asconf",
254 .data = &init_net.sctp.default_auto_asconf,
255 .maxlen = sizeof(int),
256 .mode = 0644,
257 .proc_handler = proc_dointvec,
258 },
259 {
260 .procname = "addip_enable",
261 .data = &init_net.sctp.addip_enable,
262 .maxlen = sizeof(int),
263 .mode = 0644,
264 .proc_handler = proc_dointvec,
265 },
266 {
267 .procname = "addip_noauth_enable",
268 .data = &init_net.sctp.addip_noauth,
269 .maxlen = sizeof(int),
270 .mode = 0644,
271 .proc_handler = proc_dointvec,
272 },
273 {
274 .procname = "prsctp_enable",
275 .data = &init_net.sctp.prsctp_enable,
276 .maxlen = sizeof(int),
277 .mode = 0644,
278 .proc_handler = proc_dointvec,
279 },
280 {
281 .procname = "reconf_enable",
282 .data = &init_net.sctp.reconf_enable,
283 .maxlen = sizeof(int),
284 .mode = 0644,
285 .proc_handler = proc_dointvec,
286 },
287 {
288 .procname = "auth_enable",
289 .data = &init_net.sctp.auth_enable,
290 .maxlen = sizeof(int),
291 .mode = 0644,
292 .proc_handler = proc_sctp_do_auth,
293 },
294 {
295 .procname = "intl_enable",
296 .data = &init_net.sctp.intl_enable,
297 .maxlen = sizeof(int),
298 .mode = 0644,
299 .proc_handler = proc_dointvec,
300 },
301 {
302 .procname = "ecn_enable",
303 .data = &init_net.sctp.ecn_enable,
304 .maxlen = sizeof(int),
305 .mode = 0644,
306 .proc_handler = proc_dointvec,
307 },
308 {
309 .procname = "plpmtud_probe_interval",
310 .data = &init_net.sctp.probe_interval,
311 .maxlen = sizeof(int),
312 .mode = 0644,
313 .proc_handler = proc_sctp_do_probe_interval,
314 },
315 {
316 .procname = "udp_port",
317 .data = &init_net.sctp.udp_port,
318 .maxlen = sizeof(int),
319 .mode = 0644,
320 .proc_handler = proc_sctp_do_udp_port,
321 .extra1 = SYSCTL_ZERO,
322 .extra2 = &udp_port_max,
323 },
324 {
325 .procname = "encap_port",
326 .data = &init_net.sctp.encap_port,
327 .maxlen = sizeof(int),
328 .mode = 0644,
329 .proc_handler = proc_dointvec_minmax,
330 .extra1 = SYSCTL_ZERO,
331 .extra2 = &udp_port_max,
332 },
333 {
334 .procname = "addr_scope_policy",
335 .data = &init_net.sctp.scope_policy,
336 .maxlen = sizeof(int),
337 .mode = 0644,
338 .proc_handler = proc_dointvec_minmax,
339 .extra1 = SYSCTL_ZERO,
340 .extra2 = &addr_scope_max,
341 },
342 {
343 .procname = "rwnd_update_shift",
344 .data = &init_net.sctp.rwnd_upd_shift,
345 .maxlen = sizeof(int),
346 .mode = 0644,
347 .proc_handler = &proc_dointvec_minmax,
348 .extra1 = SYSCTL_ONE,
349 .extra2 = &rwnd_scale_max,
350 },
351 {
352 .procname = "max_autoclose",
353 .data = &init_net.sctp.max_autoclose,
354 .maxlen = sizeof(unsigned long),
355 .mode = 0644,
356 .proc_handler = &proc_doulongvec_minmax,
357 .extra1 = &max_autoclose_min,
358 .extra2 = &max_autoclose_max,
359 },
360#ifdef CONFIG_NET_L3_MASTER_DEV
361 {
362 .procname = "l3mdev_accept",
363 .data = &init_net.sctp.l3mdev_accept,
364 .maxlen = sizeof(int),
365 .mode = 0644,
366 .proc_handler = proc_dointvec_minmax,
367 .extra1 = SYSCTL_ZERO,
368 .extra2 = SYSCTL_ONE,
369 },
370#endif
371 {
372 .procname = "pf_enable",
373 .data = &init_net.sctp.pf_enable,
374 .maxlen = sizeof(int),
375 .mode = 0644,
376 .proc_handler = proc_dointvec,
377 },
378 {
379 .procname = "pf_expose",
380 .data = &init_net.sctp.pf_expose,
381 .maxlen = sizeof(int),
382 .mode = 0644,
383 .proc_handler = proc_dointvec_minmax,
384 .extra1 = SYSCTL_ZERO,
385 .extra2 = &pf_expose_max,
386 },
387
388 { /* sentinel */ }
389};
390
391static int proc_sctp_do_hmac_alg(struct ctl_table *ctl, int write,
392 void *buffer, size_t *lenp, loff_t *ppos)
393{
394 struct net *net = current->nsproxy->net_ns;
395 struct ctl_table tbl;
396 bool changed = false;
397 char *none = "none";
398 char tmp[8] = {0};
399 int ret;
400
401 memset(&tbl, 0, sizeof(struct ctl_table));
402
403 if (write) {
404 tbl.data = tmp;
405 tbl.maxlen = sizeof(tmp);
406 } else {
407 tbl.data = net->sctp.sctp_hmac_alg ? : none;
408 tbl.maxlen = strlen(tbl.data);
409 }
410
411 ret = proc_dostring(&tbl, write, buffer, lenp, ppos);
412 if (write && ret == 0) {
413#ifdef CONFIG_CRYPTO_MD5
414 if (!strncmp(tmp, "md5", 3)) {
415 net->sctp.sctp_hmac_alg = "md5";
416 changed = true;
417 }
418#endif
419#ifdef CONFIG_CRYPTO_SHA1
420 if (!strncmp(tmp, "sha1", 4)) {
421 net->sctp.sctp_hmac_alg = "sha1";
422 changed = true;
423 }
424#endif
425 if (!strncmp(tmp, "none", 4)) {
426 net->sctp.sctp_hmac_alg = NULL;
427 changed = true;
428 }
429 if (!changed)
430 ret = -EINVAL;
431 }
432
433 return ret;
434}
435
436static int proc_sctp_do_rto_min(struct ctl_table *ctl, int write,
437 void *buffer, size_t *lenp, loff_t *ppos)
438{
439 struct net *net = current->nsproxy->net_ns;
440 unsigned int min = *(unsigned int *) ctl->extra1;
441 unsigned int max = *(unsigned int *) ctl->extra2;
442 struct ctl_table tbl;
443 int ret, new_value;
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.rto_min;
452
453 ret = proc_dointvec(&tbl, write, buffer, lenp, ppos);
454 if (write && ret == 0) {
455 if (new_value > max || new_value < min)
456 return -EINVAL;
457
458 net->sctp.rto_min = new_value;
459 }
460
461 return ret;
462}
463
464static int proc_sctp_do_rto_max(struct ctl_table *ctl, int write,
465 void *buffer, size_t *lenp, loff_t *ppos)
466{
467 struct net *net = current->nsproxy->net_ns;
468 unsigned int min = *(unsigned int *) ctl->extra1;
469 unsigned int max = *(unsigned int *) ctl->extra2;
470 struct ctl_table tbl;
471 int ret, new_value;
472
473 memset(&tbl, 0, sizeof(struct ctl_table));
474 tbl.maxlen = sizeof(unsigned int);
475
476 if (write)
477 tbl.data = &new_value;
478 else
479 tbl.data = &net->sctp.rto_max;
480
481 ret = proc_dointvec(&tbl, write, buffer, lenp, ppos);
482 if (write && ret == 0) {
483 if (new_value > max || new_value < min)
484 return -EINVAL;
485
486 net->sctp.rto_max = new_value;
487 }
488
489 return ret;
490}
491
492static int proc_sctp_do_alpha_beta(struct ctl_table *ctl, int write,
493 void *buffer, size_t *lenp, loff_t *ppos)
494{
495 if (write)
496 pr_warn_once("Changing rto_alpha or rto_beta may lead to "
497 "suboptimal rtt/srtt estimations!\n");
498
499 return proc_dointvec_minmax(ctl, write, buffer, lenp, ppos);
500}
501
502static int proc_sctp_do_auth(struct ctl_table *ctl, int write,
503 void *buffer, size_t *lenp, loff_t *ppos)
504{
505 struct net *net = current->nsproxy->net_ns;
506 struct ctl_table tbl;
507 int new_value, ret;
508
509 memset(&tbl, 0, sizeof(struct ctl_table));
510 tbl.maxlen = sizeof(unsigned int);
511
512 if (write)
513 tbl.data = &new_value;
514 else
515 tbl.data = &net->sctp.auth_enable;
516
517 ret = proc_dointvec(&tbl, write, buffer, lenp, ppos);
518 if (write && ret == 0) {
519 struct sock *sk = net->sctp.ctl_sock;
520
521 net->sctp.auth_enable = new_value;
522 /* Update the value in the control socket */
523 lock_sock(sk);
524 sctp_sk(sk)->ep->auth_enable = new_value;
525 release_sock(sk);
526 }
527
528 return ret;
529}
530
531static int proc_sctp_do_udp_port(struct ctl_table *ctl, int write,
532 void *buffer, size_t *lenp, loff_t *ppos)
533{
534 struct net *net = current->nsproxy->net_ns;
535 unsigned int min = *(unsigned int *)ctl->extra1;
536 unsigned int max = *(unsigned int *)ctl->extra2;
537 struct ctl_table tbl;
538 int ret, new_value;
539
540 memset(&tbl, 0, sizeof(struct ctl_table));
541 tbl.maxlen = sizeof(unsigned int);
542
543 if (write)
544 tbl.data = &new_value;
545 else
546 tbl.data = &net->sctp.udp_port;
547
548 ret = proc_dointvec(&tbl, write, buffer, lenp, ppos);
549 if (write && ret == 0) {
550 struct sock *sk = net->sctp.ctl_sock;
551
552 if (new_value > max || new_value < min)
553 return -EINVAL;
554
555 net->sctp.udp_port = new_value;
556 sctp_udp_sock_stop(net);
557 if (new_value) {
558 ret = sctp_udp_sock_start(net);
559 if (ret)
560 net->sctp.udp_port = 0;
561 }
562
563 /* Update the value in the control socket */
564 lock_sock(sk);
565 sctp_sk(sk)->udp_port = htons(net->sctp.udp_port);
566 release_sock(sk);
567 }
568
569 return ret;
570}
571
572static int proc_sctp_do_probe_interval(struct ctl_table *ctl, int write,
573 void *buffer, size_t *lenp, loff_t *ppos)
574{
575 struct net *net = current->nsproxy->net_ns;
576 struct ctl_table tbl;
577 int ret, new_value;
578
579 memset(&tbl, 0, sizeof(struct ctl_table));
580 tbl.maxlen = sizeof(unsigned int);
581
582 if (write)
583 tbl.data = &new_value;
584 else
585 tbl.data = &net->sctp.probe_interval;
586
587 ret = proc_dointvec(&tbl, write, buffer, lenp, ppos);
588 if (write && ret == 0) {
589 if (new_value && new_value < SCTP_PROBE_TIMER_MIN)
590 return -EINVAL;
591
592 net->sctp.probe_interval = new_value;
593 }
594
595 return ret;
596}
597
598int sctp_sysctl_net_register(struct net *net)
599{
600 struct ctl_table *table;
601 int i;
602
603 table = kmemdup(sctp_net_table, sizeof(sctp_net_table), GFP_KERNEL);
604 if (!table)
605 return -ENOMEM;
606
607 for (i = 0; table[i].data; i++)
608 table[i].data += (char *)(&net->sctp) - (char *)&init_net.sctp;
609
610 table[SCTP_RTO_MIN_IDX].extra2 = &net->sctp.rto_max;
611 table[SCTP_RTO_MAX_IDX].extra1 = &net->sctp.rto_min;
612 table[SCTP_PF_RETRANS_IDX].extra2 = &net->sctp.ps_retrans;
613 table[SCTP_PS_RETRANS_IDX].extra1 = &net->sctp.pf_retrans;
614
615 net->sctp.sysctl_header = register_net_sysctl_sz(net, "net/sctp",
616 table,
617 ARRAY_SIZE(sctp_net_table));
618 if (net->sctp.sysctl_header == NULL) {
619 kfree(table);
620 return -ENOMEM;
621 }
622 return 0;
623}
624
625void sctp_sysctl_net_unregister(struct net *net)
626{
627 struct ctl_table *table;
628
629 table = net->sctp.sysctl_header->ctl_table_arg;
630 unregister_net_sysctl_table(net->sctp.sysctl_header);
631 kfree(table);
632}
633
634static struct ctl_table_header *sctp_sysctl_header;
635
636/* Sysctl registration. */
637void sctp_sysctl_register(void)
638{
639 sctp_sysctl_header = register_net_sysctl(&init_net, "net/sctp", sctp_table);
640}
641
642/* Sysctl deregistration. */
643void sctp_sysctl_unregister(void)
644{
645 unregister_net_sysctl_table(sctp_sysctl_header);
646}