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>
30 static int timer_max = 86400000; /* ms in one day */
31 static int int_max = INT_MAX;
32 static int sack_timer_min = 1;
33 static int sack_timer_max = 500;
34 static int addr_scope_max = SCTP_SCOPE_POLICY_MAX;
35 static int rwnd_scale_max = 16;
36 static int rto_alpha_min = 0;
37 static int rto_beta_min = 0;
38 static int rto_alpha_max = 1000;
39 static int rto_beta_max = 1000;
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 __user *buffer, size_t *lenp,
49 static int proc_sctp_do_rto_min(struct ctl_table *ctl, int write,
50 void __user *buffer, size_t *lenp,
52 static int proc_sctp_do_rto_max(struct ctl_table *ctl, int write,
53 void __user *buffer, size_t *lenp,
55 static int proc_sctp_do_alpha_beta(struct ctl_table *ctl, int write,
56 void __user *buffer, size_t *lenp,
58 static int proc_sctp_do_auth(struct ctl_table *ctl, int write,
59 void __user *buffer, size_t *lenp,
62 static struct ctl_table sctp_table[] = {
64 .procname = "sctp_mem",
65 .data = &sysctl_sctp_mem,
66 .maxlen = sizeof(sysctl_sctp_mem),
68 .proc_handler = proc_doulongvec_minmax
71 .procname = "sctp_rmem",
72 .data = &sysctl_sctp_rmem,
73 .maxlen = sizeof(sysctl_sctp_rmem),
75 .proc_handler = proc_dointvec,
78 .procname = "sctp_wmem",
79 .data = &sysctl_sctp_wmem,
80 .maxlen = sizeof(sysctl_sctp_wmem),
82 .proc_handler = proc_dointvec,
88 static struct ctl_table sctp_net_table[] = {
90 .procname = "rto_initial",
91 .data = &init_net.sctp.rto_initial,
92 .maxlen = sizeof(unsigned int),
94 .proc_handler = proc_dointvec_minmax,
99 .procname = "rto_min",
100 .data = &init_net.sctp.rto_min,
101 .maxlen = sizeof(unsigned int),
103 .proc_handler = proc_sctp_do_rto_min,
105 .extra2 = &init_net.sctp.rto_max
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,
117 .procname = "rto_alpha_exp_divisor",
118 .data = &init_net.sctp.rto_alpha,
119 .maxlen = sizeof(int),
121 .proc_handler = proc_sctp_do_alpha_beta,
122 .extra1 = &rto_alpha_min,
123 .extra2 = &rto_alpha_max,
126 .procname = "rto_beta_exp_divisor",
127 .data = &init_net.sctp.rto_beta,
128 .maxlen = sizeof(int),
130 .proc_handler = proc_sctp_do_alpha_beta,
131 .extra1 = &rto_beta_min,
132 .extra2 = &rto_beta_max,
135 .procname = "max_burst",
136 .data = &init_net.sctp.max_burst,
137 .maxlen = sizeof(int),
139 .proc_handler = proc_dointvec_minmax,
144 .procname = "cookie_preserve_enable",
145 .data = &init_net.sctp.cookie_preserve_enable,
146 .maxlen = sizeof(int),
148 .proc_handler = proc_dointvec,
151 .procname = "cookie_hmac_alg",
152 .data = &init_net.sctp.sctp_hmac_alg,
155 .proc_handler = proc_sctp_do_hmac_alg,
158 .procname = "valid_cookie_life",
159 .data = &init_net.sctp.valid_cookie_life,
160 .maxlen = sizeof(unsigned int),
162 .proc_handler = proc_dointvec_minmax,
167 .procname = "sack_timeout",
168 .data = &init_net.sctp.sack_timeout,
169 .maxlen = sizeof(int),
171 .proc_handler = proc_dointvec_minmax,
172 .extra1 = &sack_timer_min,
173 .extra2 = &sack_timer_max,
176 .procname = "hb_interval",
177 .data = &init_net.sctp.hb_interval,
178 .maxlen = sizeof(unsigned int),
180 .proc_handler = proc_dointvec_minmax,
185 .procname = "association_max_retrans",
186 .data = &init_net.sctp.max_retrans_association,
187 .maxlen = sizeof(int),
189 .proc_handler = proc_dointvec_minmax,
194 .procname = "path_max_retrans",
195 .data = &init_net.sctp.max_retrans_path,
196 .maxlen = sizeof(int),
198 .proc_handler = proc_dointvec_minmax,
203 .procname = "max_init_retransmits",
204 .data = &init_net.sctp.max_retrans_init,
205 .maxlen = sizeof(int),
207 .proc_handler = proc_dointvec_minmax,
212 .procname = "pf_retrans",
213 .data = &init_net.sctp.pf_retrans,
214 .maxlen = sizeof(int),
216 .proc_handler = proc_dointvec_minmax,
221 .procname = "sndbuf_policy",
222 .data = &init_net.sctp.sndbuf_policy,
223 .maxlen = sizeof(int),
225 .proc_handler = proc_dointvec,
228 .procname = "rcvbuf_policy",
229 .data = &init_net.sctp.rcvbuf_policy,
230 .maxlen = sizeof(int),
232 .proc_handler = proc_dointvec,
235 .procname = "default_auto_asconf",
236 .data = &init_net.sctp.default_auto_asconf,
237 .maxlen = sizeof(int),
239 .proc_handler = proc_dointvec,
242 .procname = "addip_enable",
243 .data = &init_net.sctp.addip_enable,
244 .maxlen = sizeof(int),
246 .proc_handler = proc_dointvec,
249 .procname = "addip_noauth_enable",
250 .data = &init_net.sctp.addip_noauth,
251 .maxlen = sizeof(int),
253 .proc_handler = proc_dointvec,
256 .procname = "prsctp_enable",
257 .data = &init_net.sctp.prsctp_enable,
258 .maxlen = sizeof(int),
260 .proc_handler = proc_dointvec,
263 .procname = "reconf_enable",
264 .data = &init_net.sctp.reconf_enable,
265 .maxlen = sizeof(int),
267 .proc_handler = proc_dointvec,
270 .procname = "auth_enable",
271 .data = &init_net.sctp.auth_enable,
272 .maxlen = sizeof(int),
274 .proc_handler = proc_sctp_do_auth,
277 .procname = "intl_enable",
278 .data = &init_net.sctp.intl_enable,
279 .maxlen = sizeof(int),
281 .proc_handler = proc_dointvec,
284 .procname = "addr_scope_policy",
285 .data = &init_net.sctp.scope_policy,
286 .maxlen = sizeof(int),
288 .proc_handler = proc_dointvec_minmax,
290 .extra2 = &addr_scope_max,
293 .procname = "rwnd_update_shift",
294 .data = &init_net.sctp.rwnd_upd_shift,
295 .maxlen = sizeof(int),
297 .proc_handler = &proc_dointvec_minmax,
299 .extra2 = &rwnd_scale_max,
302 .procname = "max_autoclose",
303 .data = &init_net.sctp.max_autoclose,
304 .maxlen = sizeof(unsigned long),
306 .proc_handler = &proc_doulongvec_minmax,
307 .extra1 = &max_autoclose_min,
308 .extra2 = &max_autoclose_max,
311 .procname = "pf_enable",
312 .data = &init_net.sctp.pf_enable,
313 .maxlen = sizeof(int),
315 .proc_handler = proc_dointvec,
321 static int proc_sctp_do_hmac_alg(struct ctl_table *ctl, int write,
322 void __user *buffer, size_t *lenp,
325 struct net *net = current->nsproxy->net_ns;
326 struct ctl_table tbl;
327 bool changed = false;
332 memset(&tbl, 0, sizeof(struct ctl_table));
336 tbl.maxlen = sizeof(tmp);
338 tbl.data = net->sctp.sctp_hmac_alg ? : none;
339 tbl.maxlen = strlen(tbl.data);
342 ret = proc_dostring(&tbl, write, buffer, lenp, ppos);
343 if (write && ret == 0) {
344 #ifdef CONFIG_CRYPTO_MD5
345 if (!strncmp(tmp, "md5", 3)) {
346 net->sctp.sctp_hmac_alg = "md5";
350 #ifdef CONFIG_CRYPTO_SHA1
351 if (!strncmp(tmp, "sha1", 4)) {
352 net->sctp.sctp_hmac_alg = "sha1";
356 if (!strncmp(tmp, "none", 4)) {
357 net->sctp.sctp_hmac_alg = NULL;
367 static int proc_sctp_do_rto_min(struct ctl_table *ctl, int write,
368 void __user *buffer, size_t *lenp,
371 struct net *net = current->nsproxy->net_ns;
372 unsigned int min = *(unsigned int *) ctl->extra1;
373 unsigned int max = *(unsigned int *) ctl->extra2;
374 struct ctl_table tbl;
377 memset(&tbl, 0, sizeof(struct ctl_table));
378 tbl.maxlen = sizeof(unsigned int);
381 tbl.data = &new_value;
383 tbl.data = &net->sctp.rto_min;
385 ret = proc_dointvec(&tbl, write, buffer, lenp, ppos);
386 if (write && ret == 0) {
387 if (new_value > max || new_value < min)
390 net->sctp.rto_min = new_value;
396 static int proc_sctp_do_rto_max(struct ctl_table *ctl, int write,
397 void __user *buffer, size_t *lenp,
400 struct net *net = current->nsproxy->net_ns;
401 unsigned int min = *(unsigned int *) ctl->extra1;
402 unsigned int max = *(unsigned int *) ctl->extra2;
403 struct ctl_table tbl;
406 memset(&tbl, 0, sizeof(struct ctl_table));
407 tbl.maxlen = sizeof(unsigned int);
410 tbl.data = &new_value;
412 tbl.data = &net->sctp.rto_max;
414 ret = proc_dointvec(&tbl, write, buffer, lenp, ppos);
415 if (write && ret == 0) {
416 if (new_value > max || new_value < min)
419 net->sctp.rto_max = new_value;
425 static int proc_sctp_do_alpha_beta(struct ctl_table *ctl, int write,
426 void __user *buffer, size_t *lenp,
430 pr_warn_once("Changing rto_alpha or rto_beta may lead to "
431 "suboptimal rtt/srtt estimations!\n");
433 return proc_dointvec_minmax(ctl, write, buffer, lenp, ppos);
436 static int proc_sctp_do_auth(struct ctl_table *ctl, int write,
437 void __user *buffer, size_t *lenp,
440 struct net *net = current->nsproxy->net_ns;
441 struct ctl_table tbl;
444 memset(&tbl, 0, sizeof(struct ctl_table));
445 tbl.maxlen = sizeof(unsigned int);
448 tbl.data = &new_value;
450 tbl.data = &net->sctp.auth_enable;
452 ret = proc_dointvec(&tbl, write, buffer, lenp, ppos);
453 if (write && ret == 0) {
454 struct sock *sk = net->sctp.ctl_sock;
456 net->sctp.auth_enable = new_value;
457 /* Update the value in the control socket */
459 sctp_sk(sk)->ep->auth_enable = new_value;
466 int sctp_sysctl_net_register(struct net *net)
468 struct ctl_table *table;
471 table = kmemdup(sctp_net_table, sizeof(sctp_net_table), GFP_KERNEL);
475 for (i = 0; table[i].data; i++)
476 table[i].data += (char *)(&net->sctp) - (char *)&init_net.sctp;
478 net->sctp.sysctl_header = register_net_sysctl(net, "net/sctp", table);
479 if (net->sctp.sysctl_header == NULL) {
486 void sctp_sysctl_net_unregister(struct net *net)
488 struct ctl_table *table;
490 table = net->sctp.sysctl_header->ctl_table_arg;
491 unregister_net_sysctl_table(net->sctp.sysctl_header);
495 static struct ctl_table_header *sctp_sysctl_header;
497 /* Sysctl registration. */
498 void sctp_sysctl_register(void)
500 sctp_sysctl_header = register_net_sysctl(&init_net, "net/sctp", sctp_table);
503 /* Sysctl deregistration. */
504 void sctp_sysctl_unregister(void)
506 unregister_net_sysctl_table(sctp_sysctl_header);