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1 /* sysctls for configuring RxRPC operating parameters
2  *
3  * Copyright (C) 2014 Red Hat, Inc. All Rights Reserved.
4  * Written by David Howells (dhowells@redhat.com)
5  *
6  * This program is free software; you can redistribute it and/or
7  * modify it under the terms of the GNU General Public Licence
8  * as published by the Free Software Foundation; either version
9  * 2 of the Licence, or (at your option) any later version.
10  */
11 
12 #include <linux/sysctl.h>
13 #include <net/sock.h>
14 #include <net/af_rxrpc.h>
15 #include "ar-internal.h"
16 
17 static struct ctl_table_header *rxrpc_sysctl_reg_table;
18 static const unsigned int zero = 0;
19 static const unsigned int one = 1;
20 static const unsigned int four = 4;
21 static const unsigned int thirtytwo = 32;
22 static const unsigned int n_65535 = 65535;
23 static const unsigned int n_max_acks = RXRPC_RXTX_BUFF_SIZE - 1;
24 
25 /*
26  * RxRPC operating parameters.
27  *
28  * See Documentation/networking/rxrpc.txt and the variable definitions for more
29  * information on the individual parameters.
30  */
31 static struct ctl_table rxrpc_sysctl_table[] = {
32 	/* Values measured in milliseconds */
33 	{
34 		.procname	= "req_ack_delay",
35 		.data		= &rxrpc_requested_ack_delay,
36 		.maxlen		= sizeof(unsigned int),
37 		.mode		= 0644,
38 		.proc_handler	= proc_dointvec,
39 		.extra1		= (void *)&zero,
40 	},
41 	{
42 		.procname	= "soft_ack_delay",
43 		.data		= &rxrpc_soft_ack_delay,
44 		.maxlen		= sizeof(unsigned int),
45 		.mode		= 0644,
46 		.proc_handler	= proc_dointvec,
47 		.extra1		= (void *)&one,
48 	},
49 	{
50 		.procname	= "idle_ack_delay",
51 		.data		= &rxrpc_idle_ack_delay,
52 		.maxlen		= sizeof(unsigned int),
53 		.mode		= 0644,
54 		.proc_handler	= proc_dointvec,
55 		.extra1		= (void *)&one,
56 	},
57 	{
58 		.procname	= "resend_timeout",
59 		.data		= &rxrpc_resend_timeout,
60 		.maxlen		= sizeof(unsigned int),
61 		.mode		= 0644,
62 		.proc_handler	= proc_dointvec,
63 		.extra1		= (void *)&one,
64 	},
65 	{
66 		.procname	= "idle_conn_expiry",
67 		.data		= &rxrpc_conn_idle_client_expiry,
68 		.maxlen		= sizeof(unsigned int),
69 		.mode		= 0644,
70 		.proc_handler	= proc_dointvec_ms_jiffies,
71 		.extra1		= (void *)&one,
72 	},
73 	{
74 		.procname	= "idle_conn_fast_expiry",
75 		.data		= &rxrpc_conn_idle_client_fast_expiry,
76 		.maxlen		= sizeof(unsigned int),
77 		.mode		= 0644,
78 		.proc_handler	= proc_dointvec_ms_jiffies,
79 		.extra1		= (void *)&one,
80 	},
81 
82 	/* Values measured in seconds but used in jiffies */
83 	{
84 		.procname	= "max_call_lifetime",
85 		.data		= &rxrpc_max_call_lifetime,
86 		.maxlen		= sizeof(unsigned int),
87 		.mode		= 0644,
88 		.proc_handler	= proc_dointvec,
89 		.extra1		= (void *)&one,
90 	},
91 
92 	/* Non-time values */
93 	{
94 		.procname	= "max_client_conns",
95 		.data		= &rxrpc_max_client_connections,
96 		.maxlen		= sizeof(unsigned int),
97 		.mode		= 0644,
98 		.proc_handler	= proc_dointvec_minmax,
99 		.extra1		= (void *)&rxrpc_reap_client_connections,
100 	},
101 	{
102 		.procname	= "reap_client_conns",
103 		.data		= &rxrpc_reap_client_connections,
104 		.maxlen		= sizeof(unsigned int),
105 		.mode		= 0644,
106 		.proc_handler	= proc_dointvec_minmax,
107 		.extra1		= (void *)&one,
108 		.extra2		= (void *)&rxrpc_max_client_connections,
109 	},
110 	{
111 		.procname	= "max_backlog",
112 		.data		= &rxrpc_max_backlog,
113 		.maxlen		= sizeof(unsigned int),
114 		.mode		= 0644,
115 		.proc_handler	= proc_dointvec_minmax,
116 		.extra1		= (void *)&four,
117 		.extra2		= (void *)&thirtytwo,
118 	},
119 	{
120 		.procname	= "rx_window_size",
121 		.data		= &rxrpc_rx_window_size,
122 		.maxlen		= sizeof(unsigned int),
123 		.mode		= 0644,
124 		.proc_handler	= proc_dointvec_minmax,
125 		.extra1		= (void *)&one,
126 		.extra2		= (void *)&n_max_acks,
127 	},
128 	{
129 		.procname	= "rx_mtu",
130 		.data		= &rxrpc_rx_mtu,
131 		.maxlen		= sizeof(unsigned int),
132 		.mode		= 0644,
133 		.proc_handler	= proc_dointvec_minmax,
134 		.extra1		= (void *)&one,
135 		.extra2		= (void *)&n_65535,
136 	},
137 	{
138 		.procname	= "rx_jumbo_max",
139 		.data		= &rxrpc_rx_jumbo_max,
140 		.maxlen		= sizeof(unsigned int),
141 		.mode		= 0644,
142 		.proc_handler	= proc_dointvec_minmax,
143 		.extra1		= (void *)&one,
144 		.extra2		= (void *)&four,
145 	},
146 
147 	{ }
148 };
149 
rxrpc_sysctl_init(void)150 int __init rxrpc_sysctl_init(void)
151 {
152 	rxrpc_sysctl_reg_table = register_net_sysctl(&init_net, "net/rxrpc",
153 						     rxrpc_sysctl_table);
154 	if (!rxrpc_sysctl_reg_table)
155 		return -ENOMEM;
156 	return 0;
157 }
158 
rxrpc_sysctl_exit(void)159 void rxrpc_sysctl_exit(void)
160 {
161 	if (rxrpc_sysctl_reg_table)
162 		unregister_net_sysctl_table(rxrpc_sysctl_reg_table);
163 }
164