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1/* SCTP kernel implementation
2 * (C) Copyright IBM Corp. 2002, 2004
3 * Copyright (c) 2002 Intel Corp.
4 *
5 * This file is part of the SCTP kernel implementation
6 *
7 * Sysctl related interfaces for SCTP.
8 *
9 * This SCTP implementation is free software;
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 *
15 * This SCTP implementation is distributed in the hope that it
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
22 * along with GNU CC; see the file COPYING. If not, write to
23 * the Free Software Foundation, 59 Temple Place - Suite 330,
24 * Boston, MA 02111-1307, USA.
25 *
26 * Please send any bug reports or fixes you make to the
27 * email address(es):
28 * lksctp developers <lksctp-developers@lists.sourceforge.net>
29 *
30 * Or submit a bug report through the following website:
31 * http://www.sf.net/projects/lksctp
32 *
33 * Written or modified by:
34 * Mingqin Liu <liuming@us.ibm.com>
35 * Jon Grimm <jgrimm@us.ibm.com>
36 * Ardelle Fan <ardelle.fan@intel.com>
37 * Ryan Layer <rmlayer@us.ibm.com>
38 * Sridhar Samudrala <sri@us.ibm.com>
39 *
40 * Any bugs reported given to us we will try to fix... any fixes shared will
41 * be incorporated into the next SCTP release.
42 */
43
44#include <net/sctp/structs.h>
45#include <net/sctp/sctp.h>
46#include <linux/sysctl.h>
47
48static int zero = 0;
49static int one = 1;
50static int timer_max = 86400000; /* ms in one day */
51static int int_max = INT_MAX;
52static int sack_timer_min = 1;
53static int sack_timer_max = 500;
54static int addr_scope_max = 3; /* check sctp_scope_policy_t in include/net/sctp/constants.h for max entries */
55static int rwnd_scale_max = 16;
56
57extern long sysctl_sctp_mem[3];
58extern int sysctl_sctp_rmem[3];
59extern int sysctl_sctp_wmem[3];
60
61static ctl_table sctp_table[] = {
62 {
63 .procname = "rto_initial",
64 .data = &sctp_rto_initial,
65 .maxlen = sizeof(unsigned int),
66 .mode = 0644,
67 .proc_handler = proc_dointvec_minmax,
68 .extra1 = &one,
69 .extra2 = &timer_max
70 },
71 {
72 .procname = "rto_min",
73 .data = &sctp_rto_min,
74 .maxlen = sizeof(unsigned int),
75 .mode = 0644,
76 .proc_handler = proc_dointvec_minmax,
77 .extra1 = &one,
78 .extra2 = &timer_max
79 },
80 {
81 .procname = "rto_max",
82 .data = &sctp_rto_max,
83 .maxlen = sizeof(unsigned int),
84 .mode = 0644,
85 .proc_handler = proc_dointvec_minmax,
86 .extra1 = &one,
87 .extra2 = &timer_max
88 },
89 {
90 .procname = "valid_cookie_life",
91 .data = &sctp_valid_cookie_life,
92 .maxlen = sizeof(unsigned int),
93 .mode = 0644,
94 .proc_handler = proc_dointvec_minmax,
95 .extra1 = &one,
96 .extra2 = &timer_max
97 },
98 {
99 .procname = "max_burst",
100 .data = &sctp_max_burst,
101 .maxlen = sizeof(int),
102 .mode = 0644,
103 .proc_handler = proc_dointvec_minmax,
104 .extra1 = &zero,
105 .extra2 = &int_max
106 },
107 {
108 .procname = "association_max_retrans",
109 .data = &sctp_max_retrans_association,
110 .maxlen = sizeof(int),
111 .mode = 0644,
112 .proc_handler = proc_dointvec_minmax,
113 .extra1 = &one,
114 .extra2 = &int_max
115 },
116 {
117 .procname = "sndbuf_policy",
118 .data = &sctp_sndbuf_policy,
119 .maxlen = sizeof(int),
120 .mode = 0644,
121 .proc_handler = proc_dointvec,
122 },
123 {
124 .procname = "rcvbuf_policy",
125 .data = &sctp_rcvbuf_policy,
126 .maxlen = sizeof(int),
127 .mode = 0644,
128 .proc_handler = proc_dointvec,
129 },
130 {
131 .procname = "path_max_retrans",
132 .data = &sctp_max_retrans_path,
133 .maxlen = sizeof(int),
134 .mode = 0644,
135 .proc_handler = proc_dointvec_minmax,
136 .extra1 = &one,
137 .extra2 = &int_max
138 },
139 {
140 .procname = "max_init_retransmits",
141 .data = &sctp_max_retrans_init,
142 .maxlen = sizeof(int),
143 .mode = 0644,
144 .proc_handler = proc_dointvec_minmax,
145 .extra1 = &one,
146 .extra2 = &int_max
147 },
148 {
149 .procname = "hb_interval",
150 .data = &sctp_hb_interval,
151 .maxlen = sizeof(unsigned int),
152 .mode = 0644,
153 .proc_handler = proc_dointvec_minmax,
154 .extra1 = &one,
155 .extra2 = &timer_max
156 },
157 {
158 .procname = "cookie_preserve_enable",
159 .data = &sctp_cookie_preserve_enable,
160 .maxlen = sizeof(int),
161 .mode = 0644,
162 .proc_handler = proc_dointvec,
163 },
164 {
165 .procname = "rto_alpha_exp_divisor",
166 .data = &sctp_rto_alpha,
167 .maxlen = sizeof(int),
168 .mode = 0444,
169 .proc_handler = proc_dointvec,
170 },
171 {
172 .procname = "rto_beta_exp_divisor",
173 .data = &sctp_rto_beta,
174 .maxlen = sizeof(int),
175 .mode = 0444,
176 .proc_handler = proc_dointvec,
177 },
178 {
179 .procname = "addip_enable",
180 .data = &sctp_addip_enable,
181 .maxlen = sizeof(int),
182 .mode = 0644,
183 .proc_handler = proc_dointvec,
184 },
185 {
186 .procname = "default_auto_asconf",
187 .data = &sctp_default_auto_asconf,
188 .maxlen = sizeof(int),
189 .mode = 0644,
190 .proc_handler = proc_dointvec,
191 },
192 {
193 .procname = "prsctp_enable",
194 .data = &sctp_prsctp_enable,
195 .maxlen = sizeof(int),
196 .mode = 0644,
197 .proc_handler = proc_dointvec,
198 },
199 {
200 .procname = "sack_timeout",
201 .data = &sctp_sack_timeout,
202 .maxlen = sizeof(int),
203 .mode = 0644,
204 .proc_handler = proc_dointvec_minmax,
205 .extra1 = &sack_timer_min,
206 .extra2 = &sack_timer_max,
207 },
208 {
209 .procname = "sctp_mem",
210 .data = &sysctl_sctp_mem,
211 .maxlen = sizeof(sysctl_sctp_mem),
212 .mode = 0644,
213 .proc_handler = proc_doulongvec_minmax
214 },
215 {
216 .procname = "sctp_rmem",
217 .data = &sysctl_sctp_rmem,
218 .maxlen = sizeof(sysctl_sctp_rmem),
219 .mode = 0644,
220 .proc_handler = proc_dointvec,
221 },
222 {
223 .procname = "sctp_wmem",
224 .data = &sysctl_sctp_wmem,
225 .maxlen = sizeof(sysctl_sctp_wmem),
226 .mode = 0644,
227 .proc_handler = proc_dointvec,
228 },
229 {
230 .procname = "auth_enable",
231 .data = &sctp_auth_enable,
232 .maxlen = sizeof(int),
233 .mode = 0644,
234 .proc_handler = proc_dointvec,
235 },
236 {
237 .procname = "addip_noauth_enable",
238 .data = &sctp_addip_noauth,
239 .maxlen = sizeof(int),
240 .mode = 0644,
241 .proc_handler = proc_dointvec,
242 },
243 {
244 .procname = "addr_scope_policy",
245 .data = &sctp_scope_policy,
246 .maxlen = sizeof(int),
247 .mode = 0644,
248 .proc_handler = proc_dointvec_minmax,
249 .extra1 = &zero,
250 .extra2 = &addr_scope_max,
251 },
252 {
253 .procname = "rwnd_update_shift",
254 .data = &sctp_rwnd_upd_shift,
255 .maxlen = sizeof(int),
256 .mode = 0644,
257 .proc_handler = &proc_dointvec_minmax,
258 .extra1 = &one,
259 .extra2 = &rwnd_scale_max,
260 },
261
262 { /* sentinel */ }
263};
264
265static struct ctl_path sctp_path[] = {
266 { .procname = "net", },
267 { .procname = "sctp", },
268 { }
269};
270
271static struct ctl_table_header * sctp_sysctl_header;
272
273/* Sysctl registration. */
274void sctp_sysctl_register(void)
275{
276 sctp_sysctl_header = register_sysctl_paths(sctp_path, sctp_table);
277}
278
279/* Sysctl deregistration. */
280void sctp_sysctl_unregister(void)
281{
282 unregister_sysctl_table(sctp_sysctl_header);
283}
1/* SCTP kernel implementation
2 * (C) Copyright IBM Corp. 2002, 2004
3 * Copyright (c) 2002 Intel Corp.
4 *
5 * This file is part of the SCTP kernel implementation
6 *
7 * Sysctl related interfaces for SCTP.
8 *
9 * This SCTP implementation is free software;
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 *
15 * This SCTP implementation is distributed in the hope that it
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
22 * along with GNU CC; see the file COPYING. If not, see
23 * <http://www.gnu.org/licenses/>.
24 *
25 * Please send any bug reports or fixes you make to the
26 * email address(es):
27 * lksctp developers <linux-sctp@vger.kernel.org>
28 *
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>
35 */
36
37#define pr_fmt(fmt) KBUILD_MODNAME ": " fmt
38
39#include <net/sctp/structs.h>
40#include <net/sctp/sctp.h>
41#include <linux/sysctl.h>
42
43static int zero = 0;
44static int one = 1;
45static int timer_max = 86400000; /* ms in one day */
46static int int_max = INT_MAX;
47static int sack_timer_min = 1;
48static int sack_timer_max = 500;
49static int addr_scope_max = SCTP_SCOPE_POLICY_MAX;
50static int rwnd_scale_max = 16;
51static int rto_alpha_min = 0;
52static int rto_beta_min = 0;
53static int rto_alpha_max = 1000;
54static int rto_beta_max = 1000;
55
56static unsigned long max_autoclose_min = 0;
57static unsigned long max_autoclose_max =
58 (MAX_SCHEDULE_TIMEOUT / HZ > UINT_MAX)
59 ? UINT_MAX : MAX_SCHEDULE_TIMEOUT / HZ;
60
61static int proc_sctp_do_hmac_alg(struct ctl_table *ctl, int write,
62 void __user *buffer, size_t *lenp,
63 loff_t *ppos);
64static int proc_sctp_do_rto_min(struct ctl_table *ctl, int write,
65 void __user *buffer, size_t *lenp,
66 loff_t *ppos);
67static int proc_sctp_do_rto_max(struct ctl_table *ctl, int write,
68 void __user *buffer, size_t *lenp,
69 loff_t *ppos);
70static int proc_sctp_do_alpha_beta(struct ctl_table *ctl, int write,
71 void __user *buffer, size_t *lenp,
72 loff_t *ppos);
73static int proc_sctp_do_auth(struct ctl_table *ctl, int write,
74 void __user *buffer, size_t *lenp,
75 loff_t *ppos);
76
77static struct ctl_table sctp_table[] = {
78 {
79 .procname = "sctp_mem",
80 .data = &sysctl_sctp_mem,
81 .maxlen = sizeof(sysctl_sctp_mem),
82 .mode = 0644,
83 .proc_handler = proc_doulongvec_minmax
84 },
85 {
86 .procname = "sctp_rmem",
87 .data = &sysctl_sctp_rmem,
88 .maxlen = sizeof(sysctl_sctp_rmem),
89 .mode = 0644,
90 .proc_handler = proc_dointvec,
91 },
92 {
93 .procname = "sctp_wmem",
94 .data = &sysctl_sctp_wmem,
95 .maxlen = sizeof(sysctl_sctp_wmem),
96 .mode = 0644,
97 .proc_handler = proc_dointvec,
98 },
99
100 { /* sentinel */ }
101};
102
103static struct ctl_table sctp_net_table[] = {
104 {
105 .procname = "rto_initial",
106 .data = &init_net.sctp.rto_initial,
107 .maxlen = sizeof(unsigned int),
108 .mode = 0644,
109 .proc_handler = proc_dointvec_minmax,
110 .extra1 = &one,
111 .extra2 = &timer_max
112 },
113 {
114 .procname = "rto_min",
115 .data = &init_net.sctp.rto_min,
116 .maxlen = sizeof(unsigned int),
117 .mode = 0644,
118 .proc_handler = proc_sctp_do_rto_min,
119 .extra1 = &one,
120 .extra2 = &init_net.sctp.rto_max
121 },
122 {
123 .procname = "rto_max",
124 .data = &init_net.sctp.rto_max,
125 .maxlen = sizeof(unsigned int),
126 .mode = 0644,
127 .proc_handler = proc_sctp_do_rto_max,
128 .extra1 = &init_net.sctp.rto_min,
129 .extra2 = &timer_max
130 },
131 {
132 .procname = "rto_alpha_exp_divisor",
133 .data = &init_net.sctp.rto_alpha,
134 .maxlen = sizeof(int),
135 .mode = 0644,
136 .proc_handler = proc_sctp_do_alpha_beta,
137 .extra1 = &rto_alpha_min,
138 .extra2 = &rto_alpha_max,
139 },
140 {
141 .procname = "rto_beta_exp_divisor",
142 .data = &init_net.sctp.rto_beta,
143 .maxlen = sizeof(int),
144 .mode = 0644,
145 .proc_handler = proc_sctp_do_alpha_beta,
146 .extra1 = &rto_beta_min,
147 .extra2 = &rto_beta_max,
148 },
149 {
150 .procname = "max_burst",
151 .data = &init_net.sctp.max_burst,
152 .maxlen = sizeof(int),
153 .mode = 0644,
154 .proc_handler = proc_dointvec_minmax,
155 .extra1 = &zero,
156 .extra2 = &int_max
157 },
158 {
159 .procname = "cookie_preserve_enable",
160 .data = &init_net.sctp.cookie_preserve_enable,
161 .maxlen = sizeof(int),
162 .mode = 0644,
163 .proc_handler = proc_dointvec,
164 },
165 {
166 .procname = "cookie_hmac_alg",
167 .data = &init_net.sctp.sctp_hmac_alg,
168 .maxlen = 8,
169 .mode = 0644,
170 .proc_handler = proc_sctp_do_hmac_alg,
171 },
172 {
173 .procname = "valid_cookie_life",
174 .data = &init_net.sctp.valid_cookie_life,
175 .maxlen = sizeof(unsigned int),
176 .mode = 0644,
177 .proc_handler = proc_dointvec_minmax,
178 .extra1 = &one,
179 .extra2 = &timer_max
180 },
181 {
182 .procname = "sack_timeout",
183 .data = &init_net.sctp.sack_timeout,
184 .maxlen = sizeof(int),
185 .mode = 0644,
186 .proc_handler = proc_dointvec_minmax,
187 .extra1 = &sack_timer_min,
188 .extra2 = &sack_timer_max,
189 },
190 {
191 .procname = "hb_interval",
192 .data = &init_net.sctp.hb_interval,
193 .maxlen = sizeof(unsigned int),
194 .mode = 0644,
195 .proc_handler = proc_dointvec_minmax,
196 .extra1 = &one,
197 .extra2 = &timer_max
198 },
199 {
200 .procname = "association_max_retrans",
201 .data = &init_net.sctp.max_retrans_association,
202 .maxlen = sizeof(int),
203 .mode = 0644,
204 .proc_handler = proc_dointvec_minmax,
205 .extra1 = &one,
206 .extra2 = &int_max
207 },
208 {
209 .procname = "path_max_retrans",
210 .data = &init_net.sctp.max_retrans_path,
211 .maxlen = sizeof(int),
212 .mode = 0644,
213 .proc_handler = proc_dointvec_minmax,
214 .extra1 = &one,
215 .extra2 = &int_max
216 },
217 {
218 .procname = "max_init_retransmits",
219 .data = &init_net.sctp.max_retrans_init,
220 .maxlen = sizeof(int),
221 .mode = 0644,
222 .proc_handler = proc_dointvec_minmax,
223 .extra1 = &one,
224 .extra2 = &int_max
225 },
226 {
227 .procname = "pf_retrans",
228 .data = &init_net.sctp.pf_retrans,
229 .maxlen = sizeof(int),
230 .mode = 0644,
231 .proc_handler = proc_dointvec_minmax,
232 .extra1 = &zero,
233 .extra2 = &int_max
234 },
235 {
236 .procname = "sndbuf_policy",
237 .data = &init_net.sctp.sndbuf_policy,
238 .maxlen = sizeof(int),
239 .mode = 0644,
240 .proc_handler = proc_dointvec,
241 },
242 {
243 .procname = "rcvbuf_policy",
244 .data = &init_net.sctp.rcvbuf_policy,
245 .maxlen = sizeof(int),
246 .mode = 0644,
247 .proc_handler = proc_dointvec,
248 },
249 {
250 .procname = "default_auto_asconf",
251 .data = &init_net.sctp.default_auto_asconf,
252 .maxlen = sizeof(int),
253 .mode = 0644,
254 .proc_handler = proc_dointvec,
255 },
256 {
257 .procname = "addip_enable",
258 .data = &init_net.sctp.addip_enable,
259 .maxlen = sizeof(int),
260 .mode = 0644,
261 .proc_handler = proc_dointvec,
262 },
263 {
264 .procname = "addip_noauth_enable",
265 .data = &init_net.sctp.addip_noauth,
266 .maxlen = sizeof(int),
267 .mode = 0644,
268 .proc_handler = proc_dointvec,
269 },
270 {
271 .procname = "prsctp_enable",
272 .data = &init_net.sctp.prsctp_enable,
273 .maxlen = sizeof(int),
274 .mode = 0644,
275 .proc_handler = proc_dointvec,
276 },
277 {
278 .procname = "reconf_enable",
279 .data = &init_net.sctp.reconf_enable,
280 .maxlen = sizeof(int),
281 .mode = 0644,
282 .proc_handler = proc_dointvec,
283 },
284 {
285 .procname = "auth_enable",
286 .data = &init_net.sctp.auth_enable,
287 .maxlen = sizeof(int),
288 .mode = 0644,
289 .proc_handler = proc_sctp_do_auth,
290 },
291 {
292 .procname = "intl_enable",
293 .data = &init_net.sctp.intl_enable,
294 .maxlen = sizeof(int),
295 .mode = 0644,
296 .proc_handler = proc_dointvec,
297 },
298 {
299 .procname = "addr_scope_policy",
300 .data = &init_net.sctp.scope_policy,
301 .maxlen = sizeof(int),
302 .mode = 0644,
303 .proc_handler = proc_dointvec_minmax,
304 .extra1 = &zero,
305 .extra2 = &addr_scope_max,
306 },
307 {
308 .procname = "rwnd_update_shift",
309 .data = &init_net.sctp.rwnd_upd_shift,
310 .maxlen = sizeof(int),
311 .mode = 0644,
312 .proc_handler = &proc_dointvec_minmax,
313 .extra1 = &one,
314 .extra2 = &rwnd_scale_max,
315 },
316 {
317 .procname = "max_autoclose",
318 .data = &init_net.sctp.max_autoclose,
319 .maxlen = sizeof(unsigned long),
320 .mode = 0644,
321 .proc_handler = &proc_doulongvec_minmax,
322 .extra1 = &max_autoclose_min,
323 .extra2 = &max_autoclose_max,
324 },
325 {
326 .procname = "pf_enable",
327 .data = &init_net.sctp.pf_enable,
328 .maxlen = sizeof(int),
329 .mode = 0644,
330 .proc_handler = proc_dointvec,
331 },
332
333 { /* sentinel */ }
334};
335
336static int proc_sctp_do_hmac_alg(struct ctl_table *ctl, int write,
337 void __user *buffer, size_t *lenp,
338 loff_t *ppos)
339{
340 struct net *net = current->nsproxy->net_ns;
341 struct ctl_table tbl;
342 bool changed = false;
343 char *none = "none";
344 char tmp[8] = {0};
345 int ret;
346
347 memset(&tbl, 0, sizeof(struct ctl_table));
348
349 if (write) {
350 tbl.data = tmp;
351 tbl.maxlen = sizeof(tmp);
352 } else {
353 tbl.data = net->sctp.sctp_hmac_alg ? : none;
354 tbl.maxlen = strlen(tbl.data);
355 }
356
357 ret = proc_dostring(&tbl, write, buffer, lenp, ppos);
358 if (write && ret == 0) {
359#ifdef CONFIG_CRYPTO_MD5
360 if (!strncmp(tmp, "md5", 3)) {
361 net->sctp.sctp_hmac_alg = "md5";
362 changed = true;
363 }
364#endif
365#ifdef CONFIG_CRYPTO_SHA1
366 if (!strncmp(tmp, "sha1", 4)) {
367 net->sctp.sctp_hmac_alg = "sha1";
368 changed = true;
369 }
370#endif
371 if (!strncmp(tmp, "none", 4)) {
372 net->sctp.sctp_hmac_alg = NULL;
373 changed = true;
374 }
375 if (!changed)
376 ret = -EINVAL;
377 }
378
379 return ret;
380}
381
382static int proc_sctp_do_rto_min(struct ctl_table *ctl, int write,
383 void __user *buffer, size_t *lenp,
384 loff_t *ppos)
385{
386 struct net *net = current->nsproxy->net_ns;
387 unsigned int min = *(unsigned int *) ctl->extra1;
388 unsigned int max = *(unsigned int *) ctl->extra2;
389 struct ctl_table tbl;
390 int ret, new_value;
391
392 memset(&tbl, 0, sizeof(struct ctl_table));
393 tbl.maxlen = sizeof(unsigned int);
394
395 if (write)
396 tbl.data = &new_value;
397 else
398 tbl.data = &net->sctp.rto_min;
399
400 ret = proc_dointvec(&tbl, write, buffer, lenp, ppos);
401 if (write && ret == 0) {
402 if (new_value > max || new_value < min)
403 return -EINVAL;
404
405 net->sctp.rto_min = new_value;
406 }
407
408 return ret;
409}
410
411static int proc_sctp_do_rto_max(struct ctl_table *ctl, int write,
412 void __user *buffer, size_t *lenp,
413 loff_t *ppos)
414{
415 struct net *net = current->nsproxy->net_ns;
416 unsigned int min = *(unsigned int *) ctl->extra1;
417 unsigned int max = *(unsigned int *) ctl->extra2;
418 struct ctl_table tbl;
419 int ret, new_value;
420
421 memset(&tbl, 0, sizeof(struct ctl_table));
422 tbl.maxlen = sizeof(unsigned int);
423
424 if (write)
425 tbl.data = &new_value;
426 else
427 tbl.data = &net->sctp.rto_max;
428
429 ret = proc_dointvec(&tbl, write, buffer, lenp, ppos);
430 if (write && ret == 0) {
431 if (new_value > max || new_value < min)
432 return -EINVAL;
433
434 net->sctp.rto_max = new_value;
435 }
436
437 return ret;
438}
439
440static int proc_sctp_do_alpha_beta(struct ctl_table *ctl, int write,
441 void __user *buffer, size_t *lenp,
442 loff_t *ppos)
443{
444 if (write)
445 pr_warn_once("Changing rto_alpha or rto_beta may lead to "
446 "suboptimal rtt/srtt estimations!\n");
447
448 return proc_dointvec_minmax(ctl, write, buffer, lenp, ppos);
449}
450
451static int proc_sctp_do_auth(struct ctl_table *ctl, int write,
452 void __user *buffer, size_t *lenp,
453 loff_t *ppos)
454{
455 struct net *net = current->nsproxy->net_ns;
456 struct ctl_table tbl;
457 int new_value, ret;
458
459 memset(&tbl, 0, sizeof(struct ctl_table));
460 tbl.maxlen = sizeof(unsigned int);
461
462 if (write)
463 tbl.data = &new_value;
464 else
465 tbl.data = &net->sctp.auth_enable;
466
467 ret = proc_dointvec(&tbl, write, buffer, lenp, ppos);
468 if (write && ret == 0) {
469 struct sock *sk = net->sctp.ctl_sock;
470
471 net->sctp.auth_enable = new_value;
472 /* Update the value in the control socket */
473 lock_sock(sk);
474 sctp_sk(sk)->ep->auth_enable = new_value;
475 release_sock(sk);
476 }
477
478 return ret;
479}
480
481int sctp_sysctl_net_register(struct net *net)
482{
483 struct ctl_table *table;
484 int i;
485
486 table = kmemdup(sctp_net_table, sizeof(sctp_net_table), GFP_KERNEL);
487 if (!table)
488 return -ENOMEM;
489
490 for (i = 0; table[i].data; i++)
491 table[i].data += (char *)(&net->sctp) - (char *)&init_net.sctp;
492
493 net->sctp.sysctl_header = register_net_sysctl(net, "net/sctp", table);
494 if (net->sctp.sysctl_header == NULL) {
495 kfree(table);
496 return -ENOMEM;
497 }
498 return 0;
499}
500
501void sctp_sysctl_net_unregister(struct net *net)
502{
503 struct ctl_table *table;
504
505 table = net->sctp.sysctl_header->ctl_table_arg;
506 unregister_net_sysctl_table(net->sctp.sysctl_header);
507 kfree(table);
508}
509
510static struct ctl_table_header *sctp_sysctl_header;
511
512/* Sysctl registration. */
513void sctp_sysctl_register(void)
514{
515 sctp_sysctl_header = register_net_sysctl(&init_net, "net/sctp", sctp_table);
516}
517
518/* Sysctl deregistration. */
519void sctp_sysctl_unregister(void)
520{
521 unregister_net_sysctl_table(sctp_sysctl_header);
522}