SUNRPC: don't map EKEYEXPIRED to EACCES in call_refreshresult
[linux-3.10.git] / net / sctp / sysctl.c
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
48 static int zero = 0;
49 static int one = 1;
50 static int timer_max = 86400000; /* ms in one day */
51 static int int_max = INT_MAX;
52 static int sack_timer_min = 1;
53 static int sack_timer_max = 500;
54 static int addr_scope_max = 3; /* check sctp_scope_policy_t in include/net/sctp/constants.h for max entries */
55 static int rwnd_scale_max = 16;
56 static unsigned long max_autoclose_min = 0;
57 static unsigned long max_autoclose_max =
58         (MAX_SCHEDULE_TIMEOUT / HZ > UINT_MAX)
59         ? UINT_MAX : MAX_SCHEDULE_TIMEOUT / HZ;
60
61 extern long sysctl_sctp_mem[3];
62 extern int sysctl_sctp_rmem[3];
63 extern int sysctl_sctp_wmem[3];
64
65 static int proc_sctp_do_hmac_alg(ctl_table *ctl,
66                                 int write,
67                                 void __user *buffer, size_t *lenp,
68
69                                 loff_t *ppos);
70 static ctl_table sctp_table[] = {
71         {
72                 .procname       = "sctp_mem",
73                 .data           = &sysctl_sctp_mem,
74                 .maxlen         = sizeof(sysctl_sctp_mem),
75                 .mode           = 0644,
76                 .proc_handler   = proc_doulongvec_minmax
77         },
78         {
79                 .procname       = "sctp_rmem",
80                 .data           = &sysctl_sctp_rmem,
81                 .maxlen         = sizeof(sysctl_sctp_rmem),
82                 .mode           = 0644,
83                 .proc_handler   = proc_dointvec,
84         },
85         {
86                 .procname       = "sctp_wmem",
87                 .data           = &sysctl_sctp_wmem,
88                 .maxlen         = sizeof(sysctl_sctp_wmem),
89                 .mode           = 0644,
90                 .proc_handler   = proc_dointvec,
91         },
92
93         { /* sentinel */ }
94 };
95
96 static ctl_table sctp_net_table[] = {
97         {
98                 .procname       = "rto_initial",
99                 .data           = &init_net.sctp.rto_initial,
100                 .maxlen         = sizeof(unsigned int),
101                 .mode           = 0644,
102                 .proc_handler   = proc_dointvec_minmax,
103                 .extra1         = &one,
104                 .extra2         = &timer_max
105         },
106         {
107                 .procname       = "rto_min",
108                 .data           = &init_net.sctp.rto_min,
109                 .maxlen         = sizeof(unsigned int),
110                 .mode           = 0644,
111                 .proc_handler   = proc_dointvec_minmax,
112                 .extra1         = &one,
113                 .extra2         = &timer_max
114         },
115         {
116                 .procname       = "rto_max",
117                 .data           = &init_net.sctp.rto_max,
118                 .maxlen         = sizeof(unsigned int),
119                 .mode           = 0644,
120                 .proc_handler   = proc_dointvec_minmax,
121                 .extra1         = &one,
122                 .extra2         = &timer_max
123         },
124         {
125                 .procname       = "rto_alpha_exp_divisor",
126                 .data           = &init_net.sctp.rto_alpha,
127                 .maxlen         = sizeof(int),
128                 .mode           = 0444,
129                 .proc_handler   = proc_dointvec,
130         },
131         {
132                 .procname       = "rto_beta_exp_divisor",
133                 .data           = &init_net.sctp.rto_beta,
134                 .maxlen         = sizeof(int),
135                 .mode           = 0444,
136                 .proc_handler   = proc_dointvec,
137         },
138         {
139                 .procname       = "max_burst",
140                 .data           = &init_net.sctp.max_burst,
141                 .maxlen         = sizeof(int),
142                 .mode           = 0644,
143                 .proc_handler   = proc_dointvec_minmax,
144                 .extra1         = &zero,
145                 .extra2         = &int_max
146         },
147         {
148                 .procname       = "cookie_preserve_enable",
149                 .data           = &init_net.sctp.cookie_preserve_enable,
150                 .maxlen         = sizeof(int),
151                 .mode           = 0644,
152                 .proc_handler   = proc_dointvec,
153         },
154         {
155                 .procname       = "cookie_hmac_alg",
156                 .maxlen         = 8,
157                 .mode           = 0644,
158                 .proc_handler   = proc_sctp_do_hmac_alg,
159         },
160         {
161                 .procname       = "valid_cookie_life",
162                 .data           = &init_net.sctp.valid_cookie_life,
163                 .maxlen         = sizeof(unsigned int),
164                 .mode           = 0644,
165                 .proc_handler   = proc_dointvec_minmax,
166                 .extra1         = &one,
167                 .extra2         = &timer_max
168         },
169         {
170                 .procname       = "sack_timeout",
171                 .data           = &init_net.sctp.sack_timeout,
172                 .maxlen         = sizeof(int),
173                 .mode           = 0644,
174                 .proc_handler   = proc_dointvec_minmax,
175                 .extra1         = &sack_timer_min,
176                 .extra2         = &sack_timer_max,
177         },
178         {
179                 .procname       = "hb_interval",
180                 .data           = &init_net.sctp.hb_interval,
181                 .maxlen         = sizeof(unsigned int),
182                 .mode           = 0644,
183                 .proc_handler   = proc_dointvec_minmax,
184                 .extra1         = &one,
185                 .extra2         = &timer_max
186         },
187         {
188                 .procname       = "association_max_retrans",
189                 .data           = &init_net.sctp.max_retrans_association,
190                 .maxlen         = sizeof(int),
191                 .mode           = 0644,
192                 .proc_handler   = proc_dointvec_minmax,
193                 .extra1         = &one,
194                 .extra2         = &int_max
195         },
196         {
197                 .procname       = "path_max_retrans",
198                 .data           = &init_net.sctp.max_retrans_path,
199                 .maxlen         = sizeof(int),
200                 .mode           = 0644,
201                 .proc_handler   = proc_dointvec_minmax,
202                 .extra1         = &one,
203                 .extra2         = &int_max
204         },
205         {
206                 .procname       = "max_init_retransmits",
207                 .data           = &init_net.sctp.max_retrans_init,
208                 .maxlen         = sizeof(int),
209                 .mode           = 0644,
210                 .proc_handler   = proc_dointvec_minmax,
211                 .extra1         = &one,
212                 .extra2         = &int_max
213         },
214         {
215                 .procname       = "pf_retrans",
216                 .data           = &init_net.sctp.pf_retrans,
217                 .maxlen         = sizeof(int),
218                 .mode           = 0644,
219                 .proc_handler   = proc_dointvec_minmax,
220                 .extra1         = &zero,
221                 .extra2         = &int_max
222         },
223         {
224                 .procname       = "sndbuf_policy",
225                 .data           = &init_net.sctp.sndbuf_policy,
226                 .maxlen         = sizeof(int),
227                 .mode           = 0644,
228                 .proc_handler   = proc_dointvec,
229         },
230         {
231                 .procname       = "rcvbuf_policy",
232                 .data           = &init_net.sctp.rcvbuf_policy,
233                 .maxlen         = sizeof(int),
234                 .mode           = 0644,
235                 .proc_handler   = proc_dointvec,
236         },
237         {
238                 .procname       = "default_auto_asconf",
239                 .data           = &init_net.sctp.default_auto_asconf,
240                 .maxlen         = sizeof(int),
241                 .mode           = 0644,
242                 .proc_handler   = proc_dointvec,
243         },
244         {
245                 .procname       = "addip_enable",
246                 .data           = &init_net.sctp.addip_enable,
247                 .maxlen         = sizeof(int),
248                 .mode           = 0644,
249                 .proc_handler   = proc_dointvec,
250         },
251         {
252                 .procname       = "addip_noauth_enable",
253                 .data           = &init_net.sctp.addip_noauth,
254                 .maxlen         = sizeof(int),
255                 .mode           = 0644,
256                 .proc_handler   = proc_dointvec,
257         },
258         {
259                 .procname       = "prsctp_enable",
260                 .data           = &init_net.sctp.prsctp_enable,
261                 .maxlen         = sizeof(int),
262                 .mode           = 0644,
263                 .proc_handler   = proc_dointvec,
264         },
265         {
266                 .procname       = "auth_enable",
267                 .data           = &init_net.sctp.auth_enable,
268                 .maxlen         = sizeof(int),
269                 .mode           = 0644,
270                 .proc_handler   = proc_dointvec,
271         },
272         {
273                 .procname       = "addr_scope_policy",
274                 .data           = &init_net.sctp.scope_policy,
275                 .maxlen         = sizeof(int),
276                 .mode           = 0644,
277                 .proc_handler   = proc_dointvec_minmax,
278                 .extra1         = &zero,
279                 .extra2         = &addr_scope_max,
280         },
281         {
282                 .procname       = "rwnd_update_shift",
283                 .data           = &init_net.sctp.rwnd_upd_shift,
284                 .maxlen         = sizeof(int),
285                 .mode           = 0644,
286                 .proc_handler   = &proc_dointvec_minmax,
287                 .extra1         = &one,
288                 .extra2         = &rwnd_scale_max,
289         },
290         {
291                 .procname       = "max_autoclose",
292                 .data           = &init_net.sctp.max_autoclose,
293                 .maxlen         = sizeof(unsigned long),
294                 .mode           = 0644,
295                 .proc_handler   = &proc_doulongvec_minmax,
296                 .extra1         = &max_autoclose_min,
297                 .extra2         = &max_autoclose_max,
298         },
299
300         { /* sentinel */ }
301 };
302
303 static int proc_sctp_do_hmac_alg(ctl_table *ctl,
304                                 int write,
305                                 void __user *buffer, size_t *lenp,
306                                 loff_t *ppos)
307 {
308         struct net *net = current->nsproxy->net_ns;
309         char tmp[8];
310         ctl_table tbl;
311         int ret;
312         int changed = 0;
313         char *none = "none";
314
315         memset(&tbl, 0, sizeof(struct ctl_table));
316
317         if (write) {
318                 tbl.data = tmp;
319                 tbl.maxlen = 8;
320         } else {
321                 tbl.data = net->sctp.sctp_hmac_alg ? : none;
322                 tbl.maxlen = strlen(tbl.data);
323         }
324                 ret = proc_dostring(&tbl, write, buffer, lenp, ppos);
325
326         if (write) {
327 #ifdef CONFIG_CRYPTO_MD5
328                 if (!strncmp(tmp, "md5", 3)) {
329                         net->sctp.sctp_hmac_alg = "md5";
330                         changed = 1;
331                 }
332 #endif
333 #ifdef CONFIG_CRYPTO_SHA1
334                 if (!strncmp(tmp, "sha1", 4)) {
335                         net->sctp.sctp_hmac_alg = "sha1";
336                         changed = 1;
337                 }
338 #endif
339                 if (!strncmp(tmp, "none", 4)) {
340                         net->sctp.sctp_hmac_alg = NULL;
341                         changed = 1;
342                 }
343
344                 if (!changed)
345                         ret = -EINVAL;
346         }
347
348         return ret;
349 }
350
351 int sctp_sysctl_net_register(struct net *net)
352 {
353         struct ctl_table *table;
354         int i;
355
356         table = kmemdup(sctp_net_table, sizeof(sctp_net_table), GFP_KERNEL);
357         if (!table)
358                 return -ENOMEM;
359
360         for (i = 0; table[i].data; i++)
361                 table[i].data += (char *)(&net->sctp) - (char *)&init_net.sctp;
362
363         net->sctp.sysctl_header = register_net_sysctl(net, "net/sctp", table);
364         return 0;
365 }
366
367 void sctp_sysctl_net_unregister(struct net *net)
368 {
369         struct ctl_table *table;
370
371         table = net->sctp.sysctl_header->ctl_table_arg;
372         unregister_net_sysctl_table(net->sctp.sysctl_header);
373         kfree(table);
374 }
375
376 static struct ctl_table_header * sctp_sysctl_header;
377
378 /* Sysctl registration.  */
379 void sctp_sysctl_register(void)
380 {
381         sctp_sysctl_header = register_net_sysctl(&init_net, "net/sctp", sctp_table);
382 }
383
384 /* Sysctl deregistration.  */
385 void sctp_sysctl_unregister(void)
386 {
387         unregister_net_sysctl_table(sctp_sysctl_header);
388 }