[IPV4]: ipconfig.c: fix dhcp timeout behaviour
[linux-2.6.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 <linux/sysctl.h>
46
47 static ctl_handler sctp_sysctl_jiffies_ms;
48 static long rto_timer_min = 1;
49 static long rto_timer_max = 86400000; /* One day */
50
51 static ctl_table sctp_table[] = {
52         {
53                 .ctl_name       = NET_SCTP_RTO_INITIAL,
54                 .procname       = "rto_initial",
55                 .data           = &sctp_rto_initial,
56                 .maxlen         = sizeof(long),
57                 .mode           = 0644,
58                 .proc_handler   = &proc_doulongvec_ms_jiffies_minmax,
59                 .strategy       = &sctp_sysctl_jiffies_ms,
60                 .extra1         = &rto_timer_min,
61                 .extra2         = &rto_timer_max
62         },
63         {
64                 .ctl_name       = NET_SCTP_RTO_MIN,
65                 .procname       = "rto_min",
66                 .data           = &sctp_rto_min,
67                 .maxlen         = sizeof(long),
68                 .mode           = 0644,
69                 .proc_handler   = &proc_doulongvec_ms_jiffies_minmax,
70                 .strategy       = &sctp_sysctl_jiffies_ms,
71                 .extra1         = &rto_timer_min,
72                 .extra2         = &rto_timer_max
73         },
74         {
75                 .ctl_name       = NET_SCTP_RTO_MAX,
76                 .procname       = "rto_max",
77                 .data           = &sctp_rto_max,
78                 .maxlen         = sizeof(long),
79                 .mode           = 0644,
80                 .proc_handler   = &proc_doulongvec_ms_jiffies_minmax,
81                 .strategy       = &sctp_sysctl_jiffies_ms,
82                 .extra1         = &rto_timer_min,
83                 .extra2         = &rto_timer_max
84         },
85         {
86                 .ctl_name       = NET_SCTP_VALID_COOKIE_LIFE,
87                 .procname       = "valid_cookie_life",
88                 .data           = &sctp_valid_cookie_life,
89                 .maxlen         = sizeof(long),
90                 .mode           = 0644,
91                 .proc_handler   = &proc_doulongvec_ms_jiffies_minmax,
92                 .strategy       = &sctp_sysctl_jiffies_ms,
93                 .extra1         = &rto_timer_min,
94                 .extra2         = &rto_timer_max
95         },
96         {
97                 .ctl_name       = NET_SCTP_MAX_BURST,
98                 .procname       = "max_burst",
99                 .data           = &sctp_max_burst,
100                 .maxlen         = sizeof(int),
101                 .mode           = 0644,
102                 .proc_handler   = &proc_dointvec
103         },
104         {
105                 .ctl_name       = NET_SCTP_ASSOCIATION_MAX_RETRANS,
106                 .procname       = "association_max_retrans",
107                 .data           = &sctp_max_retrans_association,
108                 .maxlen         = sizeof(int),
109                 .mode           = 0644,
110                 .proc_handler   = &proc_dointvec
111         },
112         {
113                 .ctl_name       = NET_SCTP_SNDBUF_POLICY,
114                 .procname       = "sndbuf_policy",
115                 .data           = &sctp_sndbuf_policy,
116                 .maxlen         = sizeof(int),
117                 .mode           = 0644,
118                 .proc_handler   = &proc_dointvec
119         },
120         {
121                 .ctl_name       = NET_SCTP_PATH_MAX_RETRANS,
122                 .procname       = "path_max_retrans",
123                 .data           = &sctp_max_retrans_path,
124                 .maxlen         = sizeof(int),
125                 .mode           = 0644,
126                 .proc_handler   = &proc_dointvec
127         },
128         {
129                 .ctl_name       = NET_SCTP_MAX_INIT_RETRANSMITS,
130                 .procname       = "max_init_retransmits",
131                 .data           = &sctp_max_retrans_init,
132                 .maxlen         = sizeof(int),
133                 .mode           = 0644,
134                 .proc_handler   = &proc_dointvec
135         },
136         {
137                 .ctl_name       = NET_SCTP_HB_INTERVAL,
138                 .procname       = "hb_interval",
139                 .data           = &sctp_hb_interval,
140                 .maxlen         = sizeof(long),
141                 .mode           = 0644,
142                 .proc_handler   = &proc_doulongvec_ms_jiffies_minmax,
143                 .strategy       = &sctp_sysctl_jiffies_ms,
144                 .extra1         = &rto_timer_min,
145                 .extra2         = &rto_timer_max
146         },
147         {
148                 .ctl_name       = NET_SCTP_PRESERVE_ENABLE,
149                 .procname       = "cookie_preserve_enable",
150                 .data           = &sctp_cookie_preserve_enable,
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_RTO_ALPHA,
160                 .procname       = "rto_alpha_exp_divisor",
161                 .data           = &sctp_rto_alpha,
162                 .maxlen         = sizeof(int),
163                 .mode           = 0644,
164                 .proc_handler   = &proc_dointvec
165         },
166         {
167                 .ctl_name       = NET_SCTP_RTO_BETA,
168                 .procname       = "rto_beta_exp_divisor",
169                 .data           = &sctp_rto_beta,
170                 .maxlen         = sizeof(int),
171                 .mode           = 0644,
172                 .proc_handler   = &proc_dointvec
173         },
174         {
175                 .ctl_name       = NET_SCTP_ADDIP_ENABLE,
176                 .procname       = "addip_enable",
177                 .data           = &sctp_addip_enable,
178                 .maxlen         = sizeof(int),
179                 .mode           = 0644,
180                 .proc_handler   = &proc_dointvec
181         },
182         {
183                 .ctl_name       = NET_SCTP_PRSCTP_ENABLE,
184                 .procname       = "prsctp_enable",
185                 .data           = &sctp_prsctp_enable,
186                 .maxlen         = sizeof(int),
187                 .mode           = 0644,
188                 .proc_handler   = &proc_dointvec
189         },
190         { .ctl_name = 0 }
191 };
192
193 static ctl_table sctp_net_table[] = {
194         {
195                 .ctl_name       = NET_SCTP,
196                 .procname       = "sctp",
197                 .mode           = 0555,
198                 .child          = sctp_table
199         },
200         { .ctl_name = 0 }
201 };
202
203 static ctl_table sctp_root_table[] = {
204         {
205                 .ctl_name       = CTL_NET,
206                 .procname       = "net",
207                 .mode           = 0555,
208                 .child          = sctp_net_table
209         },
210         { .ctl_name = 0 }
211 };
212
213 static struct ctl_table_header * sctp_sysctl_header;
214
215 /* Sysctl registration.  */
216 void sctp_sysctl_register(void)
217 {
218         sctp_sysctl_header = register_sysctl_table(sctp_root_table, 0);
219 }
220
221 /* Sysctl deregistration.  */
222 void sctp_sysctl_unregister(void)
223 {
224         unregister_sysctl_table(sctp_sysctl_header);
225 }
226
227 /* Strategy function to convert jiffies to milliseconds.  */
228 static int sctp_sysctl_jiffies_ms(ctl_table *table, int __user *name, int nlen,
229                 void __user *oldval, size_t __user *oldlenp,
230                 void __user *newval, size_t newlen, void **context) {
231
232         if (oldval) {
233                 size_t olen;
234
235                 if (oldlenp) {
236                         if (get_user(olen, oldlenp))
237                                 return -EFAULT;
238
239                         if (olen != sizeof (int))
240                                 return -EINVAL;
241                 }
242                 if (put_user((*(int *)(table->data) * 1000) / HZ,
243                         (int __user *)oldval) ||
244                     (oldlenp && put_user(sizeof (int), oldlenp)))
245                         return -EFAULT;
246         }
247         if (newval && newlen) {
248                 int new;
249
250                 if (newlen != sizeof (int))
251                         return -EINVAL;
252
253                 if (get_user(new, (int __user *)newval))
254                         return -EFAULT;
255
256                 *(int *)(table->data) = (new * HZ) / 1000;
257         }
258         return 1;
259 }