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.
6 * This file is part of the SCTP kernel implementation
8 * Sysctl related interfaces for SCTP.
10 * Please send any bug reports or fixes you make to the
12 * lksctp developers <linux-sctp@vger.kernel.org>
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>
22 #define pr_fmt(fmt) KBUILD_MODNAME ": " fmt
24 #include <net/sctp/structs.h>
25 #include <net/sctp/sctp.h>
26 #include <linux/sysctl.h>
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;
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;
46 static int proc_sctp_do_hmac_alg(struct ctl_table *ctl, int write,
47 void *buffer, size_t *lenp, loff_t *ppos);
48 static int proc_sctp_do_rto_min(struct ctl_table *ctl, int write,
49 void *buffer, size_t *lenp, loff_t *ppos);
50 static int proc_sctp_do_rto_max(struct ctl_table *ctl, int write, void *buffer,
51 size_t *lenp, loff_t *ppos);
52 static int proc_sctp_do_udp_port(struct ctl_table *ctl, int write, void *buffer,
53 size_t *lenp, loff_t *ppos);
54 static int proc_sctp_do_alpha_beta(struct ctl_table *ctl, int write,
55 void *buffer, size_t *lenp, loff_t *ppos);
56 static int proc_sctp_do_auth(struct ctl_table *ctl, int write,
57 void *buffer, size_t *lenp, loff_t *ppos);
58 static int proc_sctp_do_probe_interval(struct ctl_table *ctl, int write,
59 void *buffer, size_t *lenp, loff_t *ppos);
61 static struct ctl_table sctp_table[] = {
63 .procname = "sctp_mem",
64 .data = &sysctl_sctp_mem,
65 .maxlen = sizeof(sysctl_sctp_mem),
67 .proc_handler = proc_doulongvec_minmax
70 .procname = "sctp_rmem",
71 .data = &sysctl_sctp_rmem,
72 .maxlen = sizeof(sysctl_sctp_rmem),
74 .proc_handler = proc_dointvec,
77 .procname = "sctp_wmem",
78 .data = &sysctl_sctp_wmem,
79 .maxlen = sizeof(sysctl_sctp_wmem),
81 .proc_handler = proc_dointvec,
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.
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
97 static 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),
103 .proc_handler = proc_sctp_do_rto_min,
104 .extra1 = SYSCTL_ONE,
105 .extra2 = &init_net.sctp.rto_max
107 [SCTP_RTO_MAX_IDX] = {
108 .procname = "rto_max",
109 .data = &init_net.sctp.rto_max,
110 .maxlen = sizeof(unsigned int),
112 .proc_handler = proc_sctp_do_rto_max,
113 .extra1 = &init_net.sctp.rto_min,
116 [SCTP_PF_RETRANS_IDX] = {
117 .procname = "pf_retrans",
118 .data = &init_net.sctp.pf_retrans,
119 .maxlen = sizeof(int),
121 .proc_handler = proc_dointvec_minmax,
122 .extra1 = SYSCTL_ZERO,
123 .extra2 = &init_net.sctp.ps_retrans,
125 [SCTP_PS_RETRANS_IDX] = {
126 .procname = "ps_retrans",
127 .data = &init_net.sctp.ps_retrans,
128 .maxlen = sizeof(int),
130 .proc_handler = proc_dointvec_minmax,
131 .extra1 = &init_net.sctp.pf_retrans,
132 .extra2 = &ps_retrans_max,
135 .procname = "rto_initial",
136 .data = &init_net.sctp.rto_initial,
137 .maxlen = sizeof(unsigned int),
139 .proc_handler = proc_dointvec_minmax,
140 .extra1 = SYSCTL_ONE,
144 .procname = "rto_alpha_exp_divisor",
145 .data = &init_net.sctp.rto_alpha,
146 .maxlen = sizeof(int),
148 .proc_handler = proc_sctp_do_alpha_beta,
149 .extra1 = &rto_alpha_min,
150 .extra2 = &rto_alpha_max,
153 .procname = "rto_beta_exp_divisor",
154 .data = &init_net.sctp.rto_beta,
155 .maxlen = sizeof(int),
157 .proc_handler = proc_sctp_do_alpha_beta,
158 .extra1 = &rto_beta_min,
159 .extra2 = &rto_beta_max,
162 .procname = "max_burst",
163 .data = &init_net.sctp.max_burst,
164 .maxlen = sizeof(int),
166 .proc_handler = proc_dointvec_minmax,
167 .extra1 = SYSCTL_ZERO,
168 .extra2 = SYSCTL_INT_MAX,
171 .procname = "cookie_preserve_enable",
172 .data = &init_net.sctp.cookie_preserve_enable,
173 .maxlen = sizeof(int),
175 .proc_handler = proc_dointvec,
178 .procname = "cookie_hmac_alg",
179 .data = &init_net.sctp.sctp_hmac_alg,
182 .proc_handler = proc_sctp_do_hmac_alg,
185 .procname = "valid_cookie_life",
186 .data = &init_net.sctp.valid_cookie_life,
187 .maxlen = sizeof(unsigned int),
189 .proc_handler = proc_dointvec_minmax,
190 .extra1 = SYSCTL_ONE,
194 .procname = "sack_timeout",
195 .data = &init_net.sctp.sack_timeout,
196 .maxlen = sizeof(int),
198 .proc_handler = proc_dointvec_minmax,
199 .extra1 = &sack_timer_min,
200 .extra2 = &sack_timer_max,
203 .procname = "hb_interval",
204 .data = &init_net.sctp.hb_interval,
205 .maxlen = sizeof(unsigned int),
207 .proc_handler = proc_dointvec_minmax,
208 .extra1 = SYSCTL_ONE,
212 .procname = "association_max_retrans",
213 .data = &init_net.sctp.max_retrans_association,
214 .maxlen = sizeof(int),
216 .proc_handler = proc_dointvec_minmax,
217 .extra1 = SYSCTL_ONE,
218 .extra2 = SYSCTL_INT_MAX,
221 .procname = "path_max_retrans",
222 .data = &init_net.sctp.max_retrans_path,
223 .maxlen = sizeof(int),
225 .proc_handler = proc_dointvec_minmax,
226 .extra1 = SYSCTL_ONE,
227 .extra2 = SYSCTL_INT_MAX,
230 .procname = "max_init_retransmits",
231 .data = &init_net.sctp.max_retrans_init,
232 .maxlen = sizeof(int),
234 .proc_handler = proc_dointvec_minmax,
235 .extra1 = SYSCTL_ONE,
236 .extra2 = SYSCTL_INT_MAX,
239 .procname = "sndbuf_policy",
240 .data = &init_net.sctp.sndbuf_policy,
241 .maxlen = sizeof(int),
243 .proc_handler = proc_dointvec,
246 .procname = "rcvbuf_policy",
247 .data = &init_net.sctp.rcvbuf_policy,
248 .maxlen = sizeof(int),
250 .proc_handler = proc_dointvec,
253 .procname = "default_auto_asconf",
254 .data = &init_net.sctp.default_auto_asconf,
255 .maxlen = sizeof(int),
257 .proc_handler = proc_dointvec,
260 .procname = "addip_enable",
261 .data = &init_net.sctp.addip_enable,
262 .maxlen = sizeof(int),
264 .proc_handler = proc_dointvec,
267 .procname = "addip_noauth_enable",
268 .data = &init_net.sctp.addip_noauth,
269 .maxlen = sizeof(int),
271 .proc_handler = proc_dointvec,
274 .procname = "prsctp_enable",
275 .data = &init_net.sctp.prsctp_enable,
276 .maxlen = sizeof(int),
278 .proc_handler = proc_dointvec,
281 .procname = "reconf_enable",
282 .data = &init_net.sctp.reconf_enable,
283 .maxlen = sizeof(int),
285 .proc_handler = proc_dointvec,
288 .procname = "auth_enable",
289 .data = &init_net.sctp.auth_enable,
290 .maxlen = sizeof(int),
292 .proc_handler = proc_sctp_do_auth,
295 .procname = "intl_enable",
296 .data = &init_net.sctp.intl_enable,
297 .maxlen = sizeof(int),
299 .proc_handler = proc_dointvec,
302 .procname = "ecn_enable",
303 .data = &init_net.sctp.ecn_enable,
304 .maxlen = sizeof(int),
306 .proc_handler = proc_dointvec,
309 .procname = "plpmtud_probe_interval",
310 .data = &init_net.sctp.probe_interval,
311 .maxlen = sizeof(int),
313 .proc_handler = proc_sctp_do_probe_interval,
316 .procname = "udp_port",
317 .data = &init_net.sctp.udp_port,
318 .maxlen = sizeof(int),
320 .proc_handler = proc_sctp_do_udp_port,
321 .extra1 = SYSCTL_ZERO,
322 .extra2 = &udp_port_max,
325 .procname = "encap_port",
326 .data = &init_net.sctp.encap_port,
327 .maxlen = sizeof(int),
329 .proc_handler = proc_dointvec_minmax,
330 .extra1 = SYSCTL_ZERO,
331 .extra2 = &udp_port_max,
334 .procname = "addr_scope_policy",
335 .data = &init_net.sctp.scope_policy,
336 .maxlen = sizeof(int),
338 .proc_handler = proc_dointvec_minmax,
339 .extra1 = SYSCTL_ZERO,
340 .extra2 = &addr_scope_max,
343 .procname = "rwnd_update_shift",
344 .data = &init_net.sctp.rwnd_upd_shift,
345 .maxlen = sizeof(int),
347 .proc_handler = &proc_dointvec_minmax,
348 .extra1 = SYSCTL_ONE,
349 .extra2 = &rwnd_scale_max,
352 .procname = "max_autoclose",
353 .data = &init_net.sctp.max_autoclose,
354 .maxlen = sizeof(unsigned long),
356 .proc_handler = &proc_doulongvec_minmax,
357 .extra1 = &max_autoclose_min,
358 .extra2 = &max_autoclose_max,
361 .procname = "pf_enable",
362 .data = &init_net.sctp.pf_enable,
363 .maxlen = sizeof(int),
365 .proc_handler = proc_dointvec,
368 .procname = "pf_expose",
369 .data = &init_net.sctp.pf_expose,
370 .maxlen = sizeof(int),
372 .proc_handler = proc_dointvec_minmax,
373 .extra1 = SYSCTL_ZERO,
374 .extra2 = &pf_expose_max,
380 static int proc_sctp_do_hmac_alg(struct ctl_table *ctl, int write,
381 void *buffer, size_t *lenp, loff_t *ppos)
383 struct net *net = current->nsproxy->net_ns;
384 struct ctl_table tbl;
385 bool changed = false;
390 memset(&tbl, 0, sizeof(struct ctl_table));
394 tbl.maxlen = sizeof(tmp);
396 tbl.data = net->sctp.sctp_hmac_alg ? : none;
397 tbl.maxlen = strlen(tbl.data);
400 ret = proc_dostring(&tbl, write, buffer, lenp, ppos);
401 if (write && ret == 0) {
402 #ifdef CONFIG_CRYPTO_MD5
403 if (!strncmp(tmp, "md5", 3)) {
404 net->sctp.sctp_hmac_alg = "md5";
408 #ifdef CONFIG_CRYPTO_SHA1
409 if (!strncmp(tmp, "sha1", 4)) {
410 net->sctp.sctp_hmac_alg = "sha1";
414 if (!strncmp(tmp, "none", 4)) {
415 net->sctp.sctp_hmac_alg = NULL;
425 static int proc_sctp_do_rto_min(struct ctl_table *ctl, int write,
426 void *buffer, size_t *lenp, loff_t *ppos)
428 struct net *net = current->nsproxy->net_ns;
429 unsigned int min = *(unsigned int *) ctl->extra1;
430 unsigned int max = *(unsigned int *) ctl->extra2;
431 struct ctl_table tbl;
434 memset(&tbl, 0, sizeof(struct ctl_table));
435 tbl.maxlen = sizeof(unsigned int);
438 tbl.data = &new_value;
440 tbl.data = &net->sctp.rto_min;
442 ret = proc_dointvec(&tbl, write, buffer, lenp, ppos);
443 if (write && ret == 0) {
444 if (new_value > max || new_value < min)
447 net->sctp.rto_min = new_value;
453 static int proc_sctp_do_rto_max(struct ctl_table *ctl, int write,
454 void *buffer, size_t *lenp, loff_t *ppos)
456 struct net *net = current->nsproxy->net_ns;
457 unsigned int min = *(unsigned int *) ctl->extra1;
458 unsigned int max = *(unsigned int *) ctl->extra2;
459 struct ctl_table tbl;
462 memset(&tbl, 0, sizeof(struct ctl_table));
463 tbl.maxlen = sizeof(unsigned int);
466 tbl.data = &new_value;
468 tbl.data = &net->sctp.rto_max;
470 ret = proc_dointvec(&tbl, write, buffer, lenp, ppos);
471 if (write && ret == 0) {
472 if (new_value > max || new_value < min)
475 net->sctp.rto_max = new_value;
481 static int proc_sctp_do_alpha_beta(struct ctl_table *ctl, int write,
482 void *buffer, size_t *lenp, loff_t *ppos)
485 pr_warn_once("Changing rto_alpha or rto_beta may lead to "
486 "suboptimal rtt/srtt estimations!\n");
488 return proc_dointvec_minmax(ctl, write, buffer, lenp, ppos);
491 static int proc_sctp_do_auth(struct ctl_table *ctl, int write,
492 void *buffer, size_t *lenp, loff_t *ppos)
494 struct net *net = current->nsproxy->net_ns;
495 struct ctl_table tbl;
498 memset(&tbl, 0, sizeof(struct ctl_table));
499 tbl.maxlen = sizeof(unsigned int);
502 tbl.data = &new_value;
504 tbl.data = &net->sctp.auth_enable;
506 ret = proc_dointvec(&tbl, write, buffer, lenp, ppos);
507 if (write && ret == 0) {
508 struct sock *sk = net->sctp.ctl_sock;
510 net->sctp.auth_enable = new_value;
511 /* Update the value in the control socket */
513 sctp_sk(sk)->ep->auth_enable = new_value;
520 static int proc_sctp_do_udp_port(struct ctl_table *ctl, int write,
521 void *buffer, size_t *lenp, loff_t *ppos)
523 struct net *net = current->nsproxy->net_ns;
524 unsigned int min = *(unsigned int *)ctl->extra1;
525 unsigned int max = *(unsigned int *)ctl->extra2;
526 struct ctl_table tbl;
529 memset(&tbl, 0, sizeof(struct ctl_table));
530 tbl.maxlen = sizeof(unsigned int);
533 tbl.data = &new_value;
535 tbl.data = &net->sctp.udp_port;
537 ret = proc_dointvec(&tbl, write, buffer, lenp, ppos);
538 if (write && ret == 0) {
539 struct sock *sk = net->sctp.ctl_sock;
541 if (new_value > max || new_value < min)
544 net->sctp.udp_port = new_value;
545 sctp_udp_sock_stop(net);
547 ret = sctp_udp_sock_start(net);
549 net->sctp.udp_port = 0;
552 /* Update the value in the control socket */
554 sctp_sk(sk)->udp_port = htons(net->sctp.udp_port);
561 static int proc_sctp_do_probe_interval(struct ctl_table *ctl, int write,
562 void *buffer, size_t *lenp, loff_t *ppos)
564 struct net *net = current->nsproxy->net_ns;
565 struct ctl_table tbl;
568 memset(&tbl, 0, sizeof(struct ctl_table));
569 tbl.maxlen = sizeof(unsigned int);
572 tbl.data = &new_value;
574 tbl.data = &net->sctp.probe_interval;
576 ret = proc_dointvec(&tbl, write, buffer, lenp, ppos);
577 if (write && ret == 0) {
578 if (new_value && new_value < SCTP_PROBE_TIMER_MIN)
581 net->sctp.probe_interval = new_value;
587 int sctp_sysctl_net_register(struct net *net)
589 struct ctl_table *table;
592 table = kmemdup(sctp_net_table, sizeof(sctp_net_table), GFP_KERNEL);
596 for (i = 0; table[i].data; i++)
597 table[i].data += (char *)(&net->sctp) - (char *)&init_net.sctp;
599 table[SCTP_RTO_MIN_IDX].extra2 = &net->sctp.rto_max;
600 table[SCTP_RTO_MAX_IDX].extra1 = &net->sctp.rto_min;
601 table[SCTP_PF_RETRANS_IDX].extra2 = &net->sctp.ps_retrans;
602 table[SCTP_PS_RETRANS_IDX].extra1 = &net->sctp.pf_retrans;
604 net->sctp.sysctl_header = register_net_sysctl(net, "net/sctp", table);
605 if (net->sctp.sysctl_header == NULL) {
612 void sctp_sysctl_net_unregister(struct net *net)
614 struct ctl_table *table;
616 table = net->sctp.sysctl_header->ctl_table_arg;
617 unregister_net_sysctl_table(net->sctp.sysctl_header);
621 static struct ctl_table_header *sctp_sysctl_header;
623 /* Sysctl registration. */
624 void sctp_sysctl_register(void)
626 sctp_sysctl_header = register_net_sysctl(&init_net, "net/sctp", sctp_table);
629 /* Sysctl deregistration. */
630 void sctp_sysctl_unregister(void)
632 unregister_net_sysctl_table(sctp_sysctl_header);