sctp: fix incorrect overflow check on autoclose
[linux-2.6.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 ctl_table sctp_table[] = {
66         {
67                 .procname       = "rto_initial",
68                 .data           = &sctp_rto_initial,
69                 .maxlen         = sizeof(unsigned int),
70                 .mode           = 0644,
71                 .proc_handler   = proc_dointvec_minmax,
72                 .extra1         = &one,
73                 .extra2         = &timer_max
74         },
75         {
76                 .procname       = "rto_min",
77                 .data           = &sctp_rto_min,
78                 .maxlen         = sizeof(unsigned int),
79                 .mode           = 0644,
80                 .proc_handler   = proc_dointvec_minmax,
81                 .extra1         = &one,
82                 .extra2         = &timer_max
83         },
84         {
85                 .procname       = "rto_max",
86                 .data           = &sctp_rto_max,
87                 .maxlen         = sizeof(unsigned int),
88                 .mode           = 0644,
89                 .proc_handler   = proc_dointvec_minmax,
90                 .extra1         = &one,
91                 .extra2         = &timer_max
92         },
93         {
94                 .procname       = "valid_cookie_life",
95                 .data           = &sctp_valid_cookie_life,
96                 .maxlen         = sizeof(unsigned int),
97                 .mode           = 0644,
98                 .proc_handler   = proc_dointvec_minmax,
99                 .extra1         = &one,
100                 .extra2         = &timer_max
101         },
102         {
103                 .procname       = "max_burst",
104                 .data           = &sctp_max_burst,
105                 .maxlen         = sizeof(int),
106                 .mode           = 0644,
107                 .proc_handler   = proc_dointvec_minmax,
108                 .extra1         = &zero,
109                 .extra2         = &int_max
110         },
111         {
112                 .procname       = "association_max_retrans",
113                 .data           = &sctp_max_retrans_association,
114                 .maxlen         = sizeof(int),
115                 .mode           = 0644,
116                 .proc_handler   = proc_dointvec_minmax,
117                 .extra1         = &one,
118                 .extra2         = &int_max
119         },
120         {
121                 .procname       = "sndbuf_policy",
122                 .data           = &sctp_sndbuf_policy,
123                 .maxlen         = sizeof(int),
124                 .mode           = 0644,
125                 .proc_handler   = proc_dointvec,
126         },
127         {
128                 .procname       = "rcvbuf_policy",
129                 .data           = &sctp_rcvbuf_policy,
130                 .maxlen         = sizeof(int),
131                 .mode           = 0644,
132                 .proc_handler   = proc_dointvec,
133         },
134         {
135                 .procname       = "path_max_retrans",
136                 .data           = &sctp_max_retrans_path,
137                 .maxlen         = sizeof(int),
138                 .mode           = 0644,
139                 .proc_handler   = proc_dointvec_minmax,
140                 .extra1         = &one,
141                 .extra2         = &int_max
142         },
143         {
144                 .procname       = "max_init_retransmits",
145                 .data           = &sctp_max_retrans_init,
146                 .maxlen         = sizeof(int),
147                 .mode           = 0644,
148                 .proc_handler   = proc_dointvec_minmax,
149                 .extra1         = &one,
150                 .extra2         = &int_max
151         },
152         {
153                 .procname       = "hb_interval",
154                 .data           = &sctp_hb_interval,
155                 .maxlen         = sizeof(unsigned int),
156                 .mode           = 0644,
157                 .proc_handler   = proc_dointvec_minmax,
158                 .extra1         = &one,
159                 .extra2         = &timer_max
160         },
161         {
162                 .procname       = "cookie_preserve_enable",
163                 .data           = &sctp_cookie_preserve_enable,
164                 .maxlen         = sizeof(int),
165                 .mode           = 0644,
166                 .proc_handler   = proc_dointvec,
167         },
168         {
169                 .procname       = "rto_alpha_exp_divisor",
170                 .data           = &sctp_rto_alpha,
171                 .maxlen         = sizeof(int),
172                 .mode           = 0444,
173                 .proc_handler   = proc_dointvec,
174         },
175         {
176                 .procname       = "rto_beta_exp_divisor",
177                 .data           = &sctp_rto_beta,
178                 .maxlen         = sizeof(int),
179                 .mode           = 0444,
180                 .proc_handler   = proc_dointvec,
181         },
182         {
183                 .procname       = "addip_enable",
184                 .data           = &sctp_addip_enable,
185                 .maxlen         = sizeof(int),
186                 .mode           = 0644,
187                 .proc_handler   = proc_dointvec,
188         },
189         {
190                 .procname       = "default_auto_asconf",
191                 .data           = &sctp_default_auto_asconf,
192                 .maxlen         = sizeof(int),
193                 .mode           = 0644,
194                 .proc_handler   = proc_dointvec,
195         },
196         {
197                 .procname       = "prsctp_enable",
198                 .data           = &sctp_prsctp_enable,
199                 .maxlen         = sizeof(int),
200                 .mode           = 0644,
201                 .proc_handler   = proc_dointvec,
202         },
203         {
204                 .procname       = "sack_timeout",
205                 .data           = &sctp_sack_timeout,
206                 .maxlen         = sizeof(int),
207                 .mode           = 0644,
208                 .proc_handler   = proc_dointvec_minmax,
209                 .extra1         = &sack_timer_min,
210                 .extra2         = &sack_timer_max,
211         },
212         {
213                 .procname       = "sctp_mem",
214                 .data           = &sysctl_sctp_mem,
215                 .maxlen         = sizeof(sysctl_sctp_mem),
216                 .mode           = 0644,
217                 .proc_handler   = proc_doulongvec_minmax
218         },
219         {
220                 .procname       = "sctp_rmem",
221                 .data           = &sysctl_sctp_rmem,
222                 .maxlen         = sizeof(sysctl_sctp_rmem),
223                 .mode           = 0644,
224                 .proc_handler   = proc_dointvec,
225         },
226         {
227                 .procname       = "sctp_wmem",
228                 .data           = &sysctl_sctp_wmem,
229                 .maxlen         = sizeof(sysctl_sctp_wmem),
230                 .mode           = 0644,
231                 .proc_handler   = proc_dointvec,
232         },
233         {
234                 .procname       = "auth_enable",
235                 .data           = &sctp_auth_enable,
236                 .maxlen         = sizeof(int),
237                 .mode           = 0644,
238                 .proc_handler   = proc_dointvec,
239         },
240         {
241                 .procname       = "addip_noauth_enable",
242                 .data           = &sctp_addip_noauth,
243                 .maxlen         = sizeof(int),
244                 .mode           = 0644,
245                 .proc_handler   = proc_dointvec,
246         },
247         {
248                 .procname       = "addr_scope_policy",
249                 .data           = &sctp_scope_policy,
250                 .maxlen         = sizeof(int),
251                 .mode           = 0644,
252                 .proc_handler   = proc_dointvec_minmax,
253                 .extra1         = &zero,
254                 .extra2         = &addr_scope_max,
255         },
256         {
257                 .procname       = "rwnd_update_shift",
258                 .data           = &sctp_rwnd_upd_shift,
259                 .maxlen         = sizeof(int),
260                 .mode           = 0644,
261                 .proc_handler   = &proc_dointvec_minmax,
262                 .extra1         = &one,
263                 .extra2         = &rwnd_scale_max,
264         },
265         {
266                 .procname       = "max_autoclose",
267                 .data           = &sctp_max_autoclose,
268                 .maxlen         = sizeof(unsigned long),
269                 .mode           = 0644,
270                 .proc_handler   = &proc_doulongvec_minmax,
271                 .extra1         = &max_autoclose_min,
272                 .extra2         = &max_autoclose_max,
273         },
274
275         { /* sentinel */ }
276 };
277
278 static struct ctl_path sctp_path[] = {
279         { .procname = "net", },
280         { .procname = "sctp", },
281         { }
282 };
283
284 static struct ctl_table_header * sctp_sysctl_header;
285
286 /* Sysctl registration.  */
287 void sctp_sysctl_register(void)
288 {
289         sctp_sysctl_header = register_sysctl_paths(sctp_path, sctp_table);
290 }
291
292 /* Sysctl deregistration.  */
293 void sctp_sysctl_unregister(void)
294 {
295         unregister_sysctl_table(sctp_sysctl_header);
296 }