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Merge branch 'csum_fixes'
[linux-2.6-block.git] / net / sctp / sysctl.c
CommitLineData
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);
b14878cc
VY		 67static int proc_sctp_do_auth(struct ctl_table *ctl, int write,
68 void __user *buffer, size_t *lenp,
69 loff_t *ppos);
4f3fdf3b 70
fe2c6338 71static struct ctl_table sctp_table[] = {
e1fc3b14
EB		 72 {
73 .procname = "sctp_mem",
74 .data = &sysctl_sctp_mem,
75 .maxlen = sizeof(sysctl_sctp_mem),
76 .mode = 0644,
77 .proc_handler = proc_doulongvec_minmax
78 },
79 {
80 .procname = "sctp_rmem",
81 .data = &sysctl_sctp_rmem,
82 .maxlen = sizeof(sysctl_sctp_rmem),
83 .mode = 0644,
84 .proc_handler = proc_dointvec,
85 },
86 {
87 .procname = "sctp_wmem",
88 .data = &sysctl_sctp_wmem,
89 .maxlen = sizeof(sysctl_sctp_wmem),
90 .mode = 0644,
91 .proc_handler = proc_dointvec,
92 },
93
94 { /* sentinel */ }
95};
96
fe2c6338 97static struct ctl_table sctp_net_table[] = {
1da177e4 98 {
1da177e4 99 .procname = "rto_initial",
e1fc3b14 100 .data = &init_net.sctp.rto_initial,
3fd091e7 101 .maxlen = sizeof(unsigned int),
1da177e4 102 .mode = 0644,
6d9f239a 103 .proc_handler = proc_dointvec_minmax,
3fd091e7
VY		 104 .extra1 = &one,
105 .extra2 = &timer_max
1da177e4
LT		 106 },
107 {
1da177e4 108 .procname = "rto_min",
e1fc3b14 109 .data = &init_net.sctp.rto_min,
3fd091e7 110 .maxlen = sizeof(unsigned int),
1da177e4 111 .mode = 0644,
4f3fdf3b 112 .proc_handler = proc_sctp_do_rto_min,
3fd091e7 113 .extra1 = &one,
4f3fdf3b 114 .extra2 = &init_net.sctp.rto_max
1da177e4
LT		 115 },
116 {
1da177e4 117 .procname = "rto_max",
e1fc3b14 118 .data = &init_net.sctp.rto_max,
3fd091e7 119 .maxlen = sizeof(unsigned int),
1da177e4 120 .mode = 0644,
4f3fdf3b 121 .proc_handler = proc_sctp_do_rto_max,
122 .extra1 = &init_net.sctp.rto_min,
3fd091e7 123 .extra2 = &timer_max
1da177e4
LT		 124 },
125 {
e1fc3b14
EB		 126 .procname = "rto_alpha_exp_divisor",
127 .data = &init_net.sctp.rto_alpha,
128 .maxlen = sizeof(int),
129 .mode = 0444,
130 .proc_handler = proc_dointvec,
131 },
132 {
133 .procname = "rto_beta_exp_divisor",
134 .data = &init_net.sctp.rto_beta,
135 .maxlen = sizeof(int),
136 .mode = 0444,
137 .proc_handler = proc_dointvec,
1da177e4
LT		 138 },
139 {
1da177e4 140 .procname = "max_burst",
e1fc3b14 141 .data = &init_net.sctp.max_burst,
1da177e4
LT		 142 .maxlen = sizeof(int),
143 .mode = 0644,
6d9f239a 144 .proc_handler = proc_dointvec_minmax,
3fd091e7
VY		 145 .extra1 = &zero,
146 .extra2 = &int_max
1da177e4
LT		 147 },
148 {
e1fc3b14
EB		 149 .procname = "cookie_preserve_enable",
150 .data = &init_net.sctp.cookie_preserve_enable,
1da177e4
LT		 151 .maxlen = sizeof(int),
152 .mode = 0644,
e1fc3b14
EB		 153 .proc_handler = proc_dointvec,
154 },
3c68198e
NH		 155 {
156 .procname = "cookie_hmac_alg",
22a1f514 157 .data = &init_net.sctp.sctp_hmac_alg,
3c68198e
NH		 158 .maxlen = 8,
159 .mode = 0644,
160 .proc_handler = proc_sctp_do_hmac_alg,
161 },
e1fc3b14
EB		 162 {
163 .procname = "valid_cookie_life",
164 .data = &init_net.sctp.valid_cookie_life,
165 .maxlen = sizeof(unsigned int),
166 .mode = 0644,
6d9f239a 167 .proc_handler = proc_dointvec_minmax,
e1fc3b14
EB		 168 .extra1 = &one,
169 .extra2 = &timer_max
1da177e4 170 },
4eb701df 171 {
e1fc3b14
EB		 172 .procname = "sack_timeout",
173 .data = &init_net.sctp.sack_timeout,
4eb701df
NH		 174 .maxlen = sizeof(int),
175 .mode = 0644,
e1fc3b14
EB		 176 .proc_handler = proc_dointvec_minmax,
177 .extra1 = &sack_timer_min,
178 .extra2 = &sack_timer_max,
4eb701df 179 },
049b3ff5 180 {
e1fc3b14
EB		 181 .procname = "hb_interval",
182 .data = &init_net.sctp.hb_interval,
183 .maxlen = sizeof(unsigned int),
049b3ff5 184 .mode = 0644,
e1fc3b14
EB		 185 .proc_handler = proc_dointvec_minmax,
186 .extra1 = &one,
187 .extra2 = &timer_max
049b3ff5 188 },
1da177e4 189 {
e1fc3b14
EB		 190 .procname = "association_max_retrans",
191 .data = &init_net.sctp.max_retrans_association,
1da177e4
LT		 192 .maxlen = sizeof(int),
193 .mode = 0644,
6d9f239a 194 .proc_handler = proc_dointvec_minmax,
3fd091e7
VY		 195 .extra1 = &one,
196 .extra2 = &int_max
1da177e4 197 },
5aa93bcf 198 {
e1fc3b14
EB		 199 .procname = "path_max_retrans",
200 .data = &init_net.sctp.max_retrans_path,
5aa93bcf
NH		 201 .maxlen = sizeof(int),
202 .mode = 0644,
203 .proc_handler = proc_dointvec_minmax,
e1fc3b14 204 .extra1 = &one,
5aa93bcf
NH		 205 .extra2 = &int_max
206 },
1da177e4 207 {
1da177e4 208 .procname = "max_init_retransmits",
e1fc3b14 209 .data = &init_net.sctp.max_retrans_init,
1da177e4
LT		 210 .maxlen = sizeof(int),
211 .mode = 0644,
6d9f239a 212 .proc_handler = proc_dointvec_minmax,
3fd091e7
VY		 213 .extra1 = &one,
214 .extra2 = &int_max
1da177e4
LT		 215 },
216 {
e1fc3b14
EB		 217 .procname = "pf_retrans",
218 .data = &init_net.sctp.pf_retrans,
219 .maxlen = sizeof(int),
1da177e4 220 .mode = 0644,
6d9f239a 221 .proc_handler = proc_dointvec_minmax,
e1fc3b14
EB		 222 .extra1 = &zero,
223 .extra2 = &int_max
1da177e4
LT		 224 },
225 {
e1fc3b14
EB		 226 .procname = "sndbuf_policy",
227 .data = &init_net.sctp.sndbuf_policy,
8116ffad 228 .maxlen = sizeof(int),
1da177e4 229 .mode = 0644,
6d9f239a 230 .proc_handler = proc_dointvec,
1da177e4
LT		 231 },
232 {
e1fc3b14
EB		 233 .procname = "rcvbuf_policy",
234 .data = &init_net.sctp.rcvbuf_policy,
dd51be0f
MH		 235 .maxlen = sizeof(int),
236 .mode = 0644,
237 .proc_handler = proc_dointvec,
238 },
239 {
240 .procname = "default_auto_asconf",
e1fc3b14 241 .data = &init_net.sctp.default_auto_asconf,
1da177e4
LT		 242 .maxlen = sizeof(int),
243 .mode = 0644,
6d9f239a 244 .proc_handler = proc_dointvec,
1da177e4
LT		 245 },
246 {
e1fc3b14
EB		 247 .procname = "addip_enable",
248 .data = &init_net.sctp.addip_enable,
1da177e4
LT		 249 .maxlen = sizeof(int),
250 .mode = 0644,
6d9f239a 251 .proc_handler = proc_dointvec,
1da177e4 252 },
2f85a429 253 {
e1fc3b14
EB		 254 .procname = "addip_noauth_enable",
255 .data = &init_net.sctp.addip_noauth,
d48e074d 256 .maxlen = sizeof(int),
2f85a429 257 .mode = 0644,
6d9f239a 258 .proc_handler = proc_dointvec,
4d93df0a
NH		 259 },
260 {
e1fc3b14
EB		 261 .procname = "prsctp_enable",
262 .data = &init_net.sctp.prsctp_enable,
a29a5bd4
VY		 263 .maxlen = sizeof(int),
264 .mode = 0644,
6d9f239a 265 .proc_handler = proc_dointvec,
a29a5bd4 266 },
73d9c4fd 267 {
e1fc3b14
EB		 268 .procname = "auth_enable",
269 .data = &init_net.sctp.auth_enable,
73d9c4fd
VY		 270 .maxlen = sizeof(int),
271 .mode = 0644,
b14878cc 272 .proc_handler = proc_sctp_do_auth,
73d9c4fd 273 },
72388433 274 {
72388433 275 .procname = "addr_scope_policy",
e1fc3b14 276 .data = &init_net.sctp.scope_policy,
72388433
BD		 277 .maxlen = sizeof(int),
278 .mode = 0644,
6d456111 279 .proc_handler = proc_dointvec_minmax,
72388433
BD		 280 .extra1 = &zero,
281 .extra2 = &addr_scope_max,
282 },
90f2f531 283 {
90f2f531 284 .procname = "rwnd_update_shift",
e1fc3b14 285 .data = &init_net.sctp.rwnd_upd_shift,
90f2f531
VY		 286 .maxlen = sizeof(int),
287 .mode = 0644,
288 .proc_handler = &proc_dointvec_minmax,
90f2f531
VY		 289 .extra1 = &one,
290 .extra2 = &rwnd_scale_max,
291 },
2692ba61
XW		 292 {
293 .procname = "max_autoclose",
e1fc3b14 294 .data = &init_net.sctp.max_autoclose,
2692ba61
XW		 295 .maxlen = sizeof(unsigned long),
296 .mode = 0644,
297 .proc_handler = &proc_doulongvec_minmax,
298 .extra1 = &max_autoclose_min,
299 .extra2 = &max_autoclose_max,
300 },
71acc0dd 301
d7fc02c7 302 { /* sentinel */ }
1da177e4
LT		 303};
304
b486b228 305static int proc_sctp_do_hmac_alg(struct ctl_table *ctl, int write,
3c68198e
NH		 306 void __user *buffer, size_t *lenp,
307 loff_t *ppos)
308{
309 struct net *net = current->nsproxy->net_ns;
310 char tmp[8];
fe2c6338 311 struct ctl_table tbl;
3c68198e
NH		 312 int ret;
313 int changed = 0;
314 char *none = "none";
315
316 memset(&tbl, 0, sizeof(struct ctl_table));
317
318 if (write) {
319 tbl.data = tmp;
320 tbl.maxlen = 8;
321 } else {
322 tbl.data = net->sctp.sctp_hmac_alg ? : none;
323 tbl.maxlen = strlen(tbl.data);
324 }
325 ret = proc_dostring(&tbl, write, buffer, lenp, ppos);
326
327 if (write) {
328#ifdef CONFIG_CRYPTO_MD5
329 if (!strncmp(tmp, "md5", 3)) {
330 net->sctp.sctp_hmac_alg = "md5";
331 changed = 1;
332 }
333#endif
334#ifdef CONFIG_CRYPTO_SHA1
335 if (!strncmp(tmp, "sha1", 4)) {
336 net->sctp.sctp_hmac_alg = "sha1";
337 changed = 1;
338 }
339#endif
340 if (!strncmp(tmp, "none", 4)) {
341 net->sctp.sctp_hmac_alg = NULL;
342 changed = 1;
343 }
344
345 if (!changed)
346 ret = -EINVAL;
347 }
348
349 return ret;
350}
351
4f3fdf3b 352static int proc_sctp_do_rto_min(struct ctl_table *ctl, int write,
353 void __user *buffer, size_t *lenp,
354 loff_t *ppos)
355{
356 struct net *net = current->nsproxy->net_ns;
357 int new_value;
358 struct ctl_table tbl;
359 unsigned int min = *(unsigned int *) ctl->extra1;
360 unsigned int max = *(unsigned int *) ctl->extra2;
361 int ret;
362
363 memset(&tbl, 0, sizeof(struct ctl_table));
364 tbl.maxlen = sizeof(unsigned int);
365
366 if (write)
367 tbl.data = &new_value;
368 else
369 tbl.data = &net->sctp.rto_min;
370 ret = proc_dointvec(&tbl, write, buffer, lenp, ppos);
371 if (write) {
372 if (ret || new_value > max || new_value < min)
373 return -EINVAL;
374 net->sctp.rto_min = new_value;
375 }
376 return ret;
377}
378
379static int proc_sctp_do_rto_max(struct ctl_table *ctl, int write,
380 void __user *buffer, size_t *lenp,
381 loff_t *ppos)
382{
383 struct net *net = current->nsproxy->net_ns;
384 int new_value;
385 struct ctl_table tbl;
386 unsigned int min = *(unsigned int *) ctl->extra1;
387 unsigned int max = *(unsigned int *) ctl->extra2;
388 int ret;
389
390 memset(&tbl, 0, sizeof(struct ctl_table));
391 tbl.maxlen = sizeof(unsigned int);
392
393 if (write)
394 tbl.data = &new_value;
395 else
396 tbl.data = &net->sctp.rto_max;
397 ret = proc_dointvec(&tbl, write, buffer, lenp, ppos);
398 if (write) {
399 if (ret || new_value > max || new_value < min)
400 return -EINVAL;
401 net->sctp.rto_max = new_value;
402 }
403 return ret;
404}
405
b14878cc
VY		 406static int proc_sctp_do_auth(struct ctl_table *ctl, int write,
407 void __user *buffer, size_t *lenp,
408 loff_t *ppos)
409{
410 struct net *net = current->nsproxy->net_ns;
411 struct ctl_table tbl;
412 int new_value, ret;
413
414 memset(&tbl, 0, sizeof(struct ctl_table));
415 tbl.maxlen = sizeof(unsigned int);
416
417 if (write)
418 tbl.data = &new_value;
419 else
420 tbl.data = &net->sctp.auth_enable;
421
422 ret = proc_dointvec(&tbl, write, buffer, lenp, ppos);
423
424 if (write) {
425 struct sock *sk = net->sctp.ctl_sock;
426
427 net->sctp.auth_enable = new_value;
428 /* Update the value in the control socket */
429 lock_sock(sk);
430 sctp_sk(sk)->ep->auth_enable = new_value;
431 release_sock(sk);
432 }
433
434 return ret;
435}
436
ebb7e95d
EB		 437int sctp_sysctl_net_register(struct net *net)
438{
eb9f3705 439 struct ctl_table *table;
440 int i;
ebb7e95d 441
eb9f3705 442 table = kmemdup(sctp_net_table, sizeof(sctp_net_table), GFP_KERNEL);
443 if (!table)
444 return -ENOMEM;
ebb7e95d 445
eb9f3705 446 for (i = 0; table[i].data; i++)
447 table[i].data += (char *)(&net->sctp) - (char *)&init_net.sctp;
e1fc3b14 448
ebb7e95d 449 net->sctp.sysctl_header = register_net_sysctl(net, "net/sctp", table);
f66138c8 450 if (net->sctp.sysctl_header == NULL) {
451 kfree(table);
452 return -ENOMEM;
453 }
ebb7e95d
EB		 454 return 0;
455}
456
457void sctp_sysctl_net_unregister(struct net *net)
458{
5f19d121
VY		 459 struct ctl_table *table;
460
461 table = net->sctp.sysctl_header->ctl_table_arg;
ebb7e95d 462 unregister_net_sysctl_table(net->sctp.sysctl_header);
5f19d121 463 kfree(table);
ebb7e95d
EB		 464}
465
26ac8e5f 466static struct ctl_table_header *sctp_sysctl_header;
1da177e4
LT		 467
468/* Sysctl registration. */
469void sctp_sysctl_register(void)
470{
ec8f23ce 471 sctp_sysctl_header = register_net_sysctl(&init_net, "net/sctp", sctp_table);
1da177e4
LT		 472}
473
474/* Sysctl deregistration. */
475void sctp_sysctl_unregister(void)
476{
5dd3df10 477 unregister_net_sysctl_table(sctp_sysctl_header);
1da177e4 478}
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