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60c778b2 1/* SCTP kernel implementation
1da177e4
LT		 2 * (C) Copyright IBM Corp. 2002, 2004
3 * Copyright (c) 2002 Intel Corp.
4 *
60c778b2 5 * This file is part of the SCTP kernel implementation
1da177e4
LT		 6 *
7 * Sysctl related interfaces for SCTP.
8 *
60c778b2 9 * This SCTP implementation is free software;
1da177e4
LT		 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 *
60c778b2 15 * This SCTP implementation is distributed in the hope that it
1da177e4
LT		 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
4b2f13a2
JK		 22 * along with GNU CC; see the file COPYING. If not, see
23 * <http://www.gnu.org/licenses/>.
1da177e4
LT		 24 *
25 * Please send any bug reports or fixes you make to the
26 * email address(es):
91705c61 27 * lksctp developers <linux-sctp@vger.kernel.org>
1da177e4 28 *
1da177e4
LT		 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>
1da177e4
LT		 35 */
36
37#include <net/sctp/structs.h>
8c5955d8 38#include <net/sctp/sctp.h>
1da177e4
LT		 39#include <linux/sysctl.h>
40
3fd091e7
VY		 41static int zero = 0;
42static int one = 1;
43static int timer_max = 86400000; /* ms in one day */
44static int int_max = INT_MAX;
d48e074d
JMG		 45static int sack_timer_min = 1;
46static int sack_timer_max = 500;
72388433 47static int addr_scope_max = 3; /* check sctp_scope_policy_t in include/net/sctp/constants.h for max entries */
90f2f531 48static int rwnd_scale_max = 16;
2692ba61
XW		 49static unsigned long max_autoclose_min = 0;
50static unsigned long max_autoclose_max =
51 (MAX_SCHEDULE_TIMEOUT / HZ > UINT_MAX)
52 ? UINT_MAX : MAX_SCHEDULE_TIMEOUT / HZ;
1da177e4 53
8d987e5c 54extern long sysctl_sctp_mem[3];
007e3936
VY		 55extern int sysctl_sctp_rmem[3];
56extern int sysctl_sctp_wmem[3];
4d93df0a 57
b486b228 58static int proc_sctp_do_hmac_alg(struct ctl_table *ctl, int write,
3c68198e 59 void __user *buffer, size_t *lenp,
3c68198e 60 loff_t *ppos);
4f3fdf3b 61static int proc_sctp_do_rto_min(struct ctl_table *ctl, int write,
62 void __user *buffer, size_t *lenp,
63 loff_t *ppos);
64static int proc_sctp_do_rto_max(struct ctl_table *ctl, int write,
3c68198e 65 void __user *buffer, size_t *lenp,
3c68198e 66 loff_t *ppos);
4f3fdf3b 67
fe2c6338 68static struct ctl_table sctp_table[] = {
e1fc3b14
EB		 69 {
70 .procname = "sctp_mem",
71 .data = &sysctl_sctp_mem,
72 .maxlen = sizeof(sysctl_sctp_mem),
73 .mode = 0644,
74 .proc_handler = proc_doulongvec_minmax
75 },
76 {
77 .procname = "sctp_rmem",
78 .data = &sysctl_sctp_rmem,
79 .maxlen = sizeof(sysctl_sctp_rmem),
80 .mode = 0644,
81 .proc_handler = proc_dointvec,
82 },
83 {
84 .procname = "sctp_wmem",
85 .data = &sysctl_sctp_wmem,
86 .maxlen = sizeof(sysctl_sctp_wmem),
87 .mode = 0644,
88 .proc_handler = proc_dointvec,
89 },
90
91 { /* sentinel */ }
92};
93
fe2c6338 94static struct ctl_table sctp_net_table[] = {
1da177e4 95 {
1da177e4 96 .procname = "rto_initial",
e1fc3b14 97 .data = &init_net.sctp.rto_initial,
3fd091e7 98 .maxlen = sizeof(unsigned int),
1da177e4 99 .mode = 0644,
6d9f239a 100 .proc_handler = proc_dointvec_minmax,
3fd091e7
VY		 101 .extra1 = &one,
102 .extra2 = &timer_max
1da177e4
LT		 103 },
104 {
1da177e4 105 .procname = "rto_min",
e1fc3b14 106 .data = &init_net.sctp.rto_min,
3fd091e7 107 .maxlen = sizeof(unsigned int),
1da177e4 108 .mode = 0644,
4f3fdf3b 109 .proc_handler = proc_sctp_do_rto_min,
3fd091e7 110 .extra1 = &one,
4f3fdf3b 111 .extra2 = &init_net.sctp.rto_max
1da177e4
LT		 112 },
113 {
1da177e4 114 .procname = "rto_max",
e1fc3b14 115 .data = &init_net.sctp.rto_max,
3fd091e7 116 .maxlen = sizeof(unsigned int),
1da177e4 117 .mode = 0644,
4f3fdf3b 118 .proc_handler = proc_sctp_do_rto_max,
119 .extra1 = &init_net.sctp.rto_min,
3fd091e7 120 .extra2 = &timer_max
1da177e4
LT		 121 },
122 {
e1fc3b14
EB		 123 .procname = "rto_alpha_exp_divisor",
124 .data = &init_net.sctp.rto_alpha,
125 .maxlen = sizeof(int),
126 .mode = 0444,
127 .proc_handler = proc_dointvec,
128 },
129 {
130 .procname = "rto_beta_exp_divisor",
131 .data = &init_net.sctp.rto_beta,
132 .maxlen = sizeof(int),
133 .mode = 0444,
134 .proc_handler = proc_dointvec,
1da177e4
LT		 135 },
136 {
1da177e4 137 .procname = "max_burst",
e1fc3b14 138 .data = &init_net.sctp.max_burst,
1da177e4
LT		 139 .maxlen = sizeof(int),
140 .mode = 0644,
6d9f239a 141 .proc_handler = proc_dointvec_minmax,
3fd091e7
VY		 142 .extra1 = &zero,
143 .extra2 = &int_max
1da177e4
LT		 144 },
145 {
e1fc3b14
EB		 146 .procname = "cookie_preserve_enable",
147 .data = &init_net.sctp.cookie_preserve_enable,
1da177e4
LT		 148 .maxlen = sizeof(int),
149 .mode = 0644,
e1fc3b14
EB		 150 .proc_handler = proc_dointvec,
151 },
3c68198e
NH		 152 {
153 .procname = "cookie_hmac_alg",
154 .maxlen = 8,
155 .mode = 0644,
156 .proc_handler = proc_sctp_do_hmac_alg,
157 },
e1fc3b14
EB		 158 {
159 .procname = "valid_cookie_life",
160 .data = &init_net.sctp.valid_cookie_life,
161 .maxlen = sizeof(unsigned int),
162 .mode = 0644,
6d9f239a 163 .proc_handler = proc_dointvec_minmax,
e1fc3b14
EB		 164 .extra1 = &one,
165 .extra2 = &timer_max
1da177e4 166 },
4eb701df 167 {
e1fc3b14
EB		 168 .procname = "sack_timeout",
169 .data = &init_net.sctp.sack_timeout,
4eb701df
NH		 170 .maxlen = sizeof(int),
171 .mode = 0644,
e1fc3b14
EB		 172 .proc_handler = proc_dointvec_minmax,
173 .extra1 = &sack_timer_min,
174 .extra2 = &sack_timer_max,
4eb701df 175 },
049b3ff5 176 {
e1fc3b14
EB		 177 .procname = "hb_interval",
178 .data = &init_net.sctp.hb_interval,
179 .maxlen = sizeof(unsigned int),
049b3ff5 180 .mode = 0644,
e1fc3b14
EB		 181 .proc_handler = proc_dointvec_minmax,
182 .extra1 = &one,
183 .extra2 = &timer_max
049b3ff5 184 },
1da177e4 185 {
e1fc3b14
EB		 186 .procname = "association_max_retrans",
187 .data = &init_net.sctp.max_retrans_association,
1da177e4
LT		 188 .maxlen = sizeof(int),
189 .mode = 0644,
6d9f239a 190 .proc_handler = proc_dointvec_minmax,
3fd091e7
VY		 191 .extra1 = &one,
192 .extra2 = &int_max
1da177e4 193 },
5aa93bcf 194 {
e1fc3b14
EB		 195 .procname = "path_max_retrans",
196 .data = &init_net.sctp.max_retrans_path,
5aa93bcf
NH		 197 .maxlen = sizeof(int),
198 .mode = 0644,
199 .proc_handler = proc_dointvec_minmax,
e1fc3b14 200 .extra1 = &one,
5aa93bcf
NH		 201 .extra2 = &int_max
202 },
1da177e4 203 {
1da177e4 204 .procname = "max_init_retransmits",
e1fc3b14 205 .data = &init_net.sctp.max_retrans_init,
1da177e4
LT		 206 .maxlen = sizeof(int),
207 .mode = 0644,
6d9f239a 208 .proc_handler = proc_dointvec_minmax,
3fd091e7
VY		 209 .extra1 = &one,
210 .extra2 = &int_max
1da177e4
LT		 211 },
212 {
e1fc3b14
EB		 213 .procname = "pf_retrans",
214 .data = &init_net.sctp.pf_retrans,
215 .maxlen = sizeof(int),
1da177e4 216 .mode = 0644,
6d9f239a 217 .proc_handler = proc_dointvec_minmax,
e1fc3b14
EB		 218 .extra1 = &zero,
219 .extra2 = &int_max
1da177e4
LT		 220 },
221 {
e1fc3b14
EB		 222 .procname = "sndbuf_policy",
223 .data = &init_net.sctp.sndbuf_policy,
8116ffad 224 .maxlen = sizeof(int),
1da177e4 225 .mode = 0644,
6d9f239a 226 .proc_handler = proc_dointvec,
1da177e4
LT		 227 },
228 {
e1fc3b14
EB		 229 .procname = "rcvbuf_policy",
230 .data = &init_net.sctp.rcvbuf_policy,
dd51be0f
MH		 231 .maxlen = sizeof(int),
232 .mode = 0644,
233 .proc_handler = proc_dointvec,
234 },
235 {
236 .procname = "default_auto_asconf",
e1fc3b14 237 .data = &init_net.sctp.default_auto_asconf,
1da177e4
LT		 238 .maxlen = sizeof(int),
239 .mode = 0644,
6d9f239a 240 .proc_handler = proc_dointvec,
1da177e4
LT		 241 },
242 {
e1fc3b14
EB		 243 .procname = "addip_enable",
244 .data = &init_net.sctp.addip_enable,
1da177e4
LT		 245 .maxlen = sizeof(int),
246 .mode = 0644,
6d9f239a 247 .proc_handler = proc_dointvec,
1da177e4 248 },
2f85a429 249 {
e1fc3b14
EB		 250 .procname = "addip_noauth_enable",
251 .data = &init_net.sctp.addip_noauth,
d48e074d 252 .maxlen = sizeof(int),
2f85a429 253 .mode = 0644,
6d9f239a 254 .proc_handler = proc_dointvec,
4d93df0a
NH		 255 },
256 {
e1fc3b14
EB		 257 .procname = "prsctp_enable",
258 .data = &init_net.sctp.prsctp_enable,
a29a5bd4
VY		 259 .maxlen = sizeof(int),
260 .mode = 0644,
6d9f239a 261 .proc_handler = proc_dointvec,
a29a5bd4 262 },
73d9c4fd 263 {
e1fc3b14
EB		 264 .procname = "auth_enable",
265 .data = &init_net.sctp.auth_enable,
73d9c4fd
VY		 266 .maxlen = sizeof(int),
267 .mode = 0644,
6d9f239a 268 .proc_handler = proc_dointvec,
73d9c4fd 269 },
72388433 270 {
72388433 271 .procname = "addr_scope_policy",
e1fc3b14 272 .data = &init_net.sctp.scope_policy,
72388433
BD		 273 .maxlen = sizeof(int),
274 .mode = 0644,
6d456111 275 .proc_handler = proc_dointvec_minmax,
72388433
BD		 276 .extra1 = &zero,
277 .extra2 = &addr_scope_max,
278 },
90f2f531 279 {
90f2f531 280 .procname = "rwnd_update_shift",
e1fc3b14 281 .data = &init_net.sctp.rwnd_upd_shift,
90f2f531
VY		 282 .maxlen = sizeof(int),
283 .mode = 0644,
284 .proc_handler = &proc_dointvec_minmax,
90f2f531
VY		 285 .extra1 = &one,
286 .extra2 = &rwnd_scale_max,
287 },
2692ba61
XW		 288 {
289 .procname = "max_autoclose",
e1fc3b14 290 .data = &init_net.sctp.max_autoclose,
2692ba61
XW		 291 .maxlen = sizeof(unsigned long),
292 .mode = 0644,
293 .proc_handler = &proc_doulongvec_minmax,
294 .extra1 = &max_autoclose_min,
295 .extra2 = &max_autoclose_max,
296 },
71acc0dd 297
d7fc02c7 298 { /* sentinel */ }
1da177e4
LT		 299};
300
b486b228 301static int proc_sctp_do_hmac_alg(struct ctl_table *ctl, int write,
3c68198e
NH		 302 void __user *buffer, size_t *lenp,
303 loff_t *ppos)
304{
305 struct net *net = current->nsproxy->net_ns;
306 char tmp[8];
fe2c6338 307 struct ctl_table tbl;
3c68198e
NH		 308 int ret;
309 int changed = 0;
310 char *none = "none";
311
312 memset(&tbl, 0, sizeof(struct ctl_table));
313
314 if (write) {
315 tbl.data = tmp;
316 tbl.maxlen = 8;
317 } else {
318 tbl.data = net->sctp.sctp_hmac_alg ? : none;
319 tbl.maxlen = strlen(tbl.data);
320 }
321 ret = proc_dostring(&tbl, write, buffer, lenp, ppos);
322
323 if (write) {
324#ifdef CONFIG_CRYPTO_MD5
325 if (!strncmp(tmp, "md5", 3)) {
326 net->sctp.sctp_hmac_alg = "md5";
327 changed = 1;
328 }
329#endif
330#ifdef CONFIG_CRYPTO_SHA1
331 if (!strncmp(tmp, "sha1", 4)) {
332 net->sctp.sctp_hmac_alg = "sha1";
333 changed = 1;
334 }
335#endif
336 if (!strncmp(tmp, "none", 4)) {
337 net->sctp.sctp_hmac_alg = NULL;
338 changed = 1;
339 }
340
341 if (!changed)
342 ret = -EINVAL;
343 }
344
345 return ret;
346}
347
4f3fdf3b 348static int proc_sctp_do_rto_min(struct ctl_table *ctl, int write,
349 void __user *buffer, size_t *lenp,
350 loff_t *ppos)
351{
352 struct net *net = current->nsproxy->net_ns;
353 int new_value;
354 struct ctl_table tbl;
355 unsigned int min = *(unsigned int *) ctl->extra1;
356 unsigned int max = *(unsigned int *) ctl->extra2;
357 int ret;
358
359 memset(&tbl, 0, sizeof(struct ctl_table));
360 tbl.maxlen = sizeof(unsigned int);
361
362 if (write)
363 tbl.data = &new_value;
364 else
365 tbl.data = &net->sctp.rto_min;
366 ret = proc_dointvec(&tbl, write, buffer, lenp, ppos);
367 if (write) {
368 if (ret || new_value > max || new_value < min)
369 return -EINVAL;
370 net->sctp.rto_min = new_value;
371 }
372 return ret;
373}
374
375static int proc_sctp_do_rto_max(struct ctl_table *ctl, int write,
376 void __user *buffer, size_t *lenp,
377 loff_t *ppos)
378{
379 struct net *net = current->nsproxy->net_ns;
380 int new_value;
381 struct ctl_table tbl;
382 unsigned int min = *(unsigned int *) ctl->extra1;
383 unsigned int max = *(unsigned int *) ctl->extra2;
384 int ret;
385
386 memset(&tbl, 0, sizeof(struct ctl_table));
387 tbl.maxlen = sizeof(unsigned int);
388
389 if (write)
390 tbl.data = &new_value;
391 else
392 tbl.data = &net->sctp.rto_max;
393 ret = proc_dointvec(&tbl, write, buffer, lenp, ppos);
394 if (write) {
395 if (ret || new_value > max || new_value < min)
396 return -EINVAL;
397 net->sctp.rto_max = new_value;
398 }
399 return ret;
400}
401
ebb7e95d
EB		 402int sctp_sysctl_net_register(struct net *net)
403{
404 struct ctl_table *table;
e1fc3b14 405 int i;
ebb7e95d
EB		 406
407 table = kmemdup(sctp_net_table, sizeof(sctp_net_table), GFP_KERNEL);
408 if (!table)
409 return -ENOMEM;
410
e1fc3b14
EB		 411 for (i = 0; table[i].data; i++)
412 table[i].data += (char *)(&net->sctp) - (char *)&init_net.sctp;
413
ebb7e95d
EB		 414 net->sctp.sysctl_header = register_net_sysctl(net, "net/sctp", table);
415 return 0;
416}
417
418void sctp_sysctl_net_unregister(struct net *net)
419{
5f19d121
VY		 420 struct ctl_table *table;
421
422 table = net->sctp.sysctl_header->ctl_table_arg;
ebb7e95d 423 unregister_net_sysctl_table(net->sctp.sysctl_header);
5f19d121 424 kfree(table);
ebb7e95d
EB		 425}
426
26ac8e5f 427static struct ctl_table_header *sctp_sysctl_header;
1da177e4
LT		 428
429/* Sysctl registration. */
430void sctp_sysctl_register(void)
431{
ec8f23ce 432 sctp_sysctl_header = register_net_sysctl(&init_net, "net/sctp", sctp_table);
1da177e4
LT		 433}
434
435/* Sysctl deregistration. */
436void sctp_sysctl_unregister(void)
437{
5dd3df10 438 unregister_net_sysctl_table(sctp_sysctl_header);
1da177e4 439}
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