xref: /openbmc/linux/net/sctp/sysctl.c (revision d5cb9783536a41df9f9cba5b0a1d78047ed787f7)
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_PATH_MAX_RETRANS,
125 		.procname	= "path_max_retrans",
126 		.data		= &sctp_max_retrans_path,
127 		.maxlen		= sizeof(int),
128 		.mode		= 0644,
129 		.proc_handler	= &proc_dointvec
130 	},
131 	{
132 		.ctl_name	= NET_SCTP_MAX_INIT_RETRANSMITS,
133 		.procname	= "max_init_retransmits",
134 		.data		= &sctp_max_retrans_init,
135 		.maxlen		= sizeof(int),
136 		.mode		= 0644,
137 		.proc_handler	= &proc_dointvec
138 	},
139 	{
140 		.ctl_name	= NET_SCTP_HB_INTERVAL,
141 		.procname	= "hb_interval",
142 		.data		= &sctp_hb_interval,
143 		.maxlen		= sizeof(long),
144 		.mode		= 0644,
145 		.proc_handler	= &proc_doulongvec_ms_jiffies_minmax,
146 		.strategy	= &sctp_sysctl_jiffies_ms,
147 		.extra1         = &rto_timer_min,
148 		.extra2         = &rto_timer_max
149 	},
150 	{
151 		.ctl_name	= NET_SCTP_PRESERVE_ENABLE,
152 		.procname	= "cookie_preserve_enable",
153 		.data		= &sctp_cookie_preserve_enable,
154 		.maxlen		= sizeof(long),
155 		.mode		= 0644,
156 		.proc_handler	= &proc_doulongvec_ms_jiffies_minmax,
157 		.strategy	= &sctp_sysctl_jiffies_ms,
158 		.extra1         = &rto_timer_min,
159 		.extra2         = &rto_timer_max
160 	},
161 	{
162 		.ctl_name	= NET_SCTP_RTO_ALPHA,
163 		.procname	= "rto_alpha_exp_divisor",
164 		.data		= &sctp_rto_alpha,
165 		.maxlen		= sizeof(int),
166 		.mode		= 0644,
167 		.proc_handler	= &proc_dointvec
168 	},
169 	{
170 		.ctl_name	= NET_SCTP_RTO_BETA,
171 		.procname	= "rto_beta_exp_divisor",
172 		.data		= &sctp_rto_beta,
173 		.maxlen		= sizeof(int),
174 		.mode		= 0644,
175 		.proc_handler	= &proc_dointvec
176 	},
177 	{
178 		.ctl_name	= NET_SCTP_ADDIP_ENABLE,
179 		.procname	= "addip_enable",
180 		.data		= &sctp_addip_enable,
181 		.maxlen		= sizeof(int),
182 		.mode		= 0644,
183 		.proc_handler	= &proc_dointvec
184 	},
185 	{
186 		.ctl_name	= NET_SCTP_PRSCTP_ENABLE,
187 		.procname	= "prsctp_enable",
188 		.data		= &sctp_prsctp_enable,
189 		.maxlen		= sizeof(int),
190 		.mode		= 0644,
191 		.proc_handler	= &proc_dointvec
192 	},
193 	{
194 		.ctl_name	= NET_SCTP_SACK_TIMEOUT,
195 		.procname	= "sack_timeout",
196 		.data		= &sctp_sack_timeout,
197 		.maxlen		= sizeof(long),
198 		.mode		= 0644,
199 		.proc_handler	= &proc_doulongvec_ms_jiffies_minmax,
200 		.strategy	= &sctp_sysctl_jiffies_ms,
201 		.extra1         = &sack_timer_min,
202 		.extra2         = &sack_timer_max,
203 	},
204 	{ .ctl_name = 0 }
205 };
206 
207 static ctl_table sctp_net_table[] = {
208 	{
209 		.ctl_name	= NET_SCTP,
210 		.procname	= "sctp",
211 		.mode		= 0555,
212 		.child		= sctp_table
213 	},
214 	{ .ctl_name = 0 }
215 };
216 
217 static ctl_table sctp_root_table[] = {
218 	{
219 		.ctl_name	= CTL_NET,
220 		.procname	= "net",
221 		.mode		= 0555,
222 		.child		= sctp_net_table
223 	},
224 	{ .ctl_name = 0 }
225 };
226 
227 static struct ctl_table_header * sctp_sysctl_header;
228 
229 /* Sysctl registration.  */
230 void sctp_sysctl_register(void)
231 {
232 	sctp_sysctl_header = register_sysctl_table(sctp_root_table, 0);
233 }
234 
235 /* Sysctl deregistration.  */
236 void sctp_sysctl_unregister(void)
237 {
238 	unregister_sysctl_table(sctp_sysctl_header);
239 }
240 
241 /* Strategy function to convert jiffies to milliseconds.  */
242 static int sctp_sysctl_jiffies_ms(ctl_table *table, int __user *name, int nlen,
243 		void __user *oldval, size_t __user *oldlenp,
244 		void __user *newval, size_t newlen, void **context) {
245 
246 	if (oldval) {
247 		size_t olen;
248 
249 		if (oldlenp) {
250 			if (get_user(olen, oldlenp))
251 				return -EFAULT;
252 
253 			if (olen != sizeof (int))
254 				return -EINVAL;
255 		}
256 		if (put_user((*(int *)(table->data) * 1000) / HZ,
257 			(int __user *)oldval) ||
258 		    (oldlenp && put_user(sizeof (int), oldlenp)))
259 			return -EFAULT;
260 	}
261 	if (newval && newlen) {
262 		int new;
263 
264 		if (newlen != sizeof (int))
265 			return -EINVAL;
266 
267 		if (get_user(new, (int __user *)newval))
268 			return -EFAULT;
269 
270 		*(int *)(table->data) = (new * HZ) / 1000;
271 	}
272 	return 1;
273 }
274