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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); |
4f3fdf3b | 67 | |
fe2c6338 | 68 | static 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 | 94 | static 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 | 301 | static 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 | 348 | static 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 | ||
375 | static 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 |
402 | int 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 | ||
418 | void 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 | 427 | static struct ctl_table_header *sctp_sysctl_header; |
1da177e4 LT |
428 | |
429 | /* Sysctl registration. */ | |
430 | void 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. */ | |
436 | void sctp_sysctl_unregister(void) | |
437 | { | |
5dd3df10 | 438 | unregister_net_sysctl_table(sctp_sysctl_header); |
1da177e4 | 439 | } |