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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 |
41 | static int zero = 0; |
42 | static int one = 1; | |
43 | static int timer_max = 86400000; /* ms in one day */ | |
44 | static int int_max = INT_MAX; | |
d48e074d JMG |
45 | static int sack_timer_min = 1; |
46 | static int sack_timer_max = 500; | |
72388433 | 47 | static int addr_scope_max = 3; /* check sctp_scope_policy_t in include/net/sctp/constants.h for max entries */ |
90f2f531 | 48 | static int rwnd_scale_max = 16; |
2692ba61 XW |
49 | static unsigned long max_autoclose_min = 0; |
50 | static unsigned long max_autoclose_max = | |
51 | (MAX_SCHEDULE_TIMEOUT / HZ > UINT_MAX) | |
52 | ? UINT_MAX : MAX_SCHEDULE_TIMEOUT / HZ; | |
1da177e4 | 53 | |
8d987e5c | 54 | extern long sysctl_sctp_mem[3]; |
007e3936 VY |
55 | extern int sysctl_sctp_rmem[3]; |
56 | extern int sysctl_sctp_wmem[3]; | |
4d93df0a | 57 | |
b486b228 | 58 | static 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 | 61 | static int proc_sctp_do_rto_min(struct ctl_table *ctl, int write, |
62 | void __user *buffer, size_t *lenp, | |
63 | loff_t *ppos); | |
64 | static 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 |
67 | static 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 | 71 | static 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 | 97 | static 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 | 305 | static 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 | 352 | static 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 | ||
379 | static 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 |
406 | static 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 |
437 | int 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 | ||
457 | void 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 | 466 | static struct ctl_table_header *sctp_sysctl_header; |
1da177e4 LT |
467 | |
468 | /* Sysctl registration. */ | |
469 | void 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. */ | |
475 | void sctp_sysctl_unregister(void) | |
476 | { | |
5dd3df10 | 477 | unregister_net_sysctl_table(sctp_sysctl_header); |
1da177e4 | 478 | } |