dc6f3ff32358c0dafd1b8ae1f63d610a5106e9b5
[linux-3.10.git] / net / sctp / sysctl.c
1 /* SCTP kernel reference Implementation
2  * (C) Copyright IBM Corp. 2002, 2004
3  * Copyright (c) 2002 Intel Corp.
4  *
5  * This file is part of the SCTP kernel reference Implementation
6  *
7  * Sysctl related interfaces for SCTP.
8  *
9  * The SCTP reference 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  * The SCTP reference 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 ctl_handler sctp_sysctl_jiffies_ms;
49 static long rto_timer_min = 1;
50 static long rto_timer_max = 86400000; /* One day */
51 static long sack_timer_min = 1;
52 static long sack_timer_max = 500;
53
54 static ctl_table sctp_table[] = {
55         {
56                 .ctl_name       = NET_SCTP_RTO_INITIAL,
57                 .procname       = "rto_initial",
58                 .data           = &sctp_rto_initial,
59                 .maxlen         = sizeof(long),
60                 .mode           = 0644,
61                 .proc_handler   = &proc_doulongvec_ms_jiffies_minmax,
62                 .strategy       = &sctp_sysctl_jiffies_ms,
63                 .extra1         = &rto_timer_min,
64                 .extra2         = &rto_timer_max
65         },
66         {
67                 .ctl_name       = NET_SCTP_RTO_MIN,
68                 .procname       = "rto_min",
69                 .data           = &sctp_rto_min,
70                 .maxlen         = sizeof(long),
71                 .mode           = 0644,
72                 .proc_handler   = &proc_doulongvec_ms_jiffies_minmax,
73                 .strategy       = &sctp_sysctl_jiffies_ms,
74                 .extra1         = &rto_timer_min,
75                 .extra2         = &rto_timer_max
76         },
77         {
78                 .ctl_name       = NET_SCTP_RTO_MAX,
79                 .procname       = "rto_max",
80                 .data           = &sctp_rto_max,
81                 .maxlen         = sizeof(long),
82                 .mode           = 0644,
83                 .proc_handler   = &proc_doulongvec_ms_jiffies_minmax,
84                 .strategy       = &sctp_sysctl_jiffies_ms,
85                 .extra1         = &rto_timer_min,
86                 .extra2         = &rto_timer_max
87         },
88         {
89                 .ctl_name       = NET_SCTP_VALID_COOKIE_LIFE,
90                 .procname       = "valid_cookie_life",
91                 .data           = &sctp_valid_cookie_life,
92                 .maxlen         = sizeof(long),
93                 .mode           = 0644,
94                 .proc_handler   = &proc_doulongvec_ms_jiffies_minmax,
95                 .strategy       = &sctp_sysctl_jiffies_ms,
96                 .extra1         = &rto_timer_min,
97                 .extra2         = &rto_timer_max
98         },
99         {
100                 .ctl_name       = NET_SCTP_MAX_BURST,
101                 .procname       = "max_burst",
102                 .data           = &sctp_max_burst,
103                 .maxlen         = sizeof(int),
104                 .mode           = 0644,
105                 .proc_handler   = &proc_dointvec
106         },
107         {
108                 .ctl_name       = NET_SCTP_ASSOCIATION_MAX_RETRANS,
109                 .procname       = "association_max_retrans",
110                 .data           = &sctp_max_retrans_association,
111                 .maxlen         = sizeof(int),
112                 .mode           = 0644,
113                 .proc_handler   = &proc_dointvec
114         },
115         {
116                 .ctl_name       = NET_SCTP_SNDBUF_POLICY,
117                 .procname       = "sndbuf_policy",
118                 .data           = &sctp_sndbuf_policy,
119                 .maxlen         = sizeof(int),
120                 .mode           = 0644,
121                 .proc_handler   = &proc_dointvec
122         },
123         {
124                 .ctl_name       = NET_SCTP_RCVBUF_POLICY,
125                 .procname       = "rcvbuf_policy",
126                 .data           = &sctp_rcvbuf_policy,
127                 .maxlen         = sizeof(int),
128                 .mode           = 0644,
129                 .proc_handler   = &proc_dointvec
130         },
131         {
132                 .ctl_name       = NET_SCTP_PATH_MAX_RETRANS,
133                 .procname       = "path_max_retrans",
134                 .data           = &sctp_max_retrans_path,
135                 .maxlen         = sizeof(int),
136                 .mode           = 0644,
137                 .proc_handler   = &proc_dointvec
138         },
139         {
140                 .ctl_name       = NET_SCTP_MAX_INIT_RETRANSMITS,
141                 .procname       = "max_init_retransmits",
142                 .data           = &sctp_max_retrans_init,
143                 .maxlen         = sizeof(int),
144                 .mode           = 0644,
145                 .proc_handler   = &proc_dointvec
146         },
147         {
148                 .ctl_name       = NET_SCTP_HB_INTERVAL,
149                 .procname       = "hb_interval",
150                 .data           = &sctp_hb_interval,
151                 .maxlen         = sizeof(long),
152                 .mode           = 0644,
153                 .proc_handler   = &proc_doulongvec_ms_jiffies_minmax,
154                 .strategy       = &sctp_sysctl_jiffies_ms,
155                 .extra1         = &rto_timer_min,
156                 .extra2         = &rto_timer_max
157         },
158         {
159                 .ctl_name       = NET_SCTP_PRESERVE_ENABLE,
160                 .procname       = "cookie_preserve_enable",
161                 .data           = &sctp_cookie_preserve_enable,
162                 .maxlen         = sizeof(int),
163                 .mode           = 0644,
164                 .proc_handler   = &proc_dointvec
165         },
166         {
167                 .ctl_name       = NET_SCTP_RTO_ALPHA,
168                 .procname       = "rto_alpha_exp_divisor",
169                 .data           = &sctp_rto_alpha,
170                 .maxlen         = sizeof(int),
171                 .mode           = 0644,
172                 .proc_handler   = &proc_dointvec
173         },
174         {
175                 .ctl_name       = NET_SCTP_RTO_BETA,
176                 .procname       = "rto_beta_exp_divisor",
177                 .data           = &sctp_rto_beta,
178                 .maxlen         = sizeof(int),
179                 .mode           = 0644,
180                 .proc_handler   = &proc_dointvec
181         },
182         {
183                 .ctl_name       = NET_SCTP_ADDIP_ENABLE,
184                 .procname       = "addip_enable",
185                 .data           = &sctp_addip_enable,
186                 .maxlen         = sizeof(int),
187                 .mode           = 0644,
188                 .proc_handler   = &proc_dointvec
189         },
190         {
191                 .ctl_name       = NET_SCTP_PRSCTP_ENABLE,
192                 .procname       = "prsctp_enable",
193                 .data           = &sctp_prsctp_enable,
194                 .maxlen         = sizeof(int),
195                 .mode           = 0644,
196                 .proc_handler   = &proc_dointvec
197         },
198         {
199                 .ctl_name       = NET_SCTP_SACK_TIMEOUT,
200                 .procname       = "sack_timeout",
201                 .data           = &sctp_sack_timeout,
202                 .maxlen         = sizeof(long),
203                 .mode           = 0644,
204                 .proc_handler   = &proc_doulongvec_ms_jiffies_minmax,
205                 .strategy       = &sctp_sysctl_jiffies_ms,
206                 .extra1         = &sack_timer_min,
207                 .extra2         = &sack_timer_max,
208         },
209         { .ctl_name = 0 }
210 };
211
212 static ctl_table sctp_net_table[] = {
213         {
214                 .ctl_name       = NET_SCTP,
215                 .procname       = "sctp",
216                 .mode           = 0555,
217                 .child          = sctp_table
218         },
219         { .ctl_name = 0 }
220 };
221
222 static ctl_table sctp_root_table[] = {
223         {
224                 .ctl_name       = CTL_NET,
225                 .procname       = "net",
226                 .mode           = 0555,
227                 .child          = sctp_net_table
228         },
229         { .ctl_name = 0 }
230 };
231
232 static struct ctl_table_header * sctp_sysctl_header;
233
234 /* Sysctl registration.  */
235 void sctp_sysctl_register(void)
236 {
237         sctp_sysctl_header = register_sysctl_table(sctp_root_table, 0);
238 }
239
240 /* Sysctl deregistration.  */
241 void sctp_sysctl_unregister(void)
242 {
243         unregister_sysctl_table(sctp_sysctl_header);
244 }
245
246 /* Strategy function to convert jiffies to milliseconds.  */
247 static int sctp_sysctl_jiffies_ms(ctl_table *table, int __user *name, int nlen,
248                 void __user *oldval, size_t __user *oldlenp,
249                 void __user *newval, size_t newlen, void **context) {
250
251         if (oldval) {
252                 size_t olen;
253
254                 if (oldlenp) {
255                         if (get_user(olen, oldlenp))
256                                 return -EFAULT;
257
258                         if (olen != sizeof (int))
259                                 return -EINVAL;
260                 }
261                 if (put_user((*(int *)(table->data) * 1000) / HZ,
262                         (int __user *)oldval) ||
263                     (oldlenp && put_user(sizeof (int), oldlenp)))
264                         return -EFAULT;
265         }
266         if (newval && newlen) {
267                 int new;
268
269                 if (newlen != sizeof (int))
270                         return -EINVAL;
271
272                 if (get_user(new, (int __user *)newval))
273                         return -EFAULT;
274
275                 *(int *)(table->data) = (new * HZ) / 1000;
276         }
277         return 1;
278 }