1 // SPDX-License-Identifier: GPL-2.0-or-later
2 /* sysctls for configuring RxRPC operating parameters
3 *
4 * Copyright (C) 2014 Red Hat, Inc. All Rights Reserved.
5 * Written by David Howells (dhowells@redhat.com)
6 */
7
8 #include <linux/sysctl.h>
9 #include <net/sock.h>
10 #include <net/af_rxrpc.h>
11 #include "ar-internal.h"
12
13 static struct ctl_table_header *rxrpc_sysctl_reg_table;
14 static const unsigned int four = 4;
15 static const unsigned int thirtytwo = 32;
16 static const unsigned int n_65535 = 65535;
17 static const unsigned int n_max_acks = RXRPC_RXTX_BUFF_SIZE - 1;
18 static const unsigned long one_jiffy = 1;
19 static const unsigned long max_jiffies = MAX_JIFFY_OFFSET;
20
21 /*
22 * RxRPC operating parameters.
23 *
24 * See Documentation/networking/rxrpc.txt and the variable definitions for more
25 * information on the individual parameters.
26 */
27 static struct ctl_table rxrpc_sysctl_table[] = {
28 /* Values measured in milliseconds but used in jiffies */
29 {
30 .procname = "req_ack_delay",
31 .data = &rxrpc_requested_ack_delay,
32 .maxlen = sizeof(unsigned long),
33 .mode = 0644,
34 .proc_handler = proc_doulongvec_ms_jiffies_minmax,
35 .extra1 = (void *)&one_jiffy,
36 .extra2 = (void *)&max_jiffies,
37 },
38 {
39 .procname = "soft_ack_delay",
40 .data = &rxrpc_soft_ack_delay,
41 .maxlen = sizeof(unsigned long),
42 .mode = 0644,
43 .proc_handler = proc_doulongvec_ms_jiffies_minmax,
44 .extra1 = (void *)&one_jiffy,
45 .extra2 = (void *)&max_jiffies,
46 },
47 {
48 .procname = "idle_ack_delay",
49 .data = &rxrpc_idle_ack_delay,
50 .maxlen = sizeof(unsigned long),
51 .mode = 0644,
52 .proc_handler = proc_doulongvec_ms_jiffies_minmax,
53 .extra1 = (void *)&one_jiffy,
54 .extra2 = (void *)&max_jiffies,
55 },
56 {
57 .procname = "idle_conn_expiry",
58 .data = &rxrpc_conn_idle_client_expiry,
59 .maxlen = sizeof(unsigned long),
60 .mode = 0644,
61 .proc_handler = proc_doulongvec_ms_jiffies_minmax,
62 .extra1 = (void *)&one_jiffy,
63 .extra2 = (void *)&max_jiffies,
64 },
65 {
66 .procname = "idle_conn_fast_expiry",
67 .data = &rxrpc_conn_idle_client_fast_expiry,
68 .maxlen = sizeof(unsigned long),
69 .mode = 0644,
70 .proc_handler = proc_doulongvec_ms_jiffies_minmax,
71 .extra1 = (void *)&one_jiffy,
72 .extra2 = (void *)&max_jiffies,
73 },
74 {
75 .procname = "resend_timeout",
76 .data = &rxrpc_resend_timeout,
77 .maxlen = sizeof(unsigned long),
78 .mode = 0644,
79 .proc_handler = proc_doulongvec_ms_jiffies_minmax,
80 .extra1 = (void *)&one_jiffy,
81 .extra2 = (void *)&max_jiffies,
82 },
83
84 /* Non-time values */
85 {
86 .procname = "max_client_conns",
87 .data = &rxrpc_max_client_connections,
88 .maxlen = sizeof(unsigned int),
89 .mode = 0644,
90 .proc_handler = proc_dointvec_minmax,
91 .extra1 = (void *)&rxrpc_reap_client_connections,
92 },
93 {
94 .procname = "reap_client_conns",
95 .data = &rxrpc_reap_client_connections,
96 .maxlen = sizeof(unsigned int),
97 .mode = 0644,
98 .proc_handler = proc_dointvec_minmax,
99 .extra1 = (void *)SYSCTL_ONE,
100 .extra2 = (void *)&rxrpc_max_client_connections,
101 },
102 {
103 .procname = "max_backlog",
104 .data = &rxrpc_max_backlog,
105 .maxlen = sizeof(unsigned int),
106 .mode = 0644,
107 .proc_handler = proc_dointvec_minmax,
108 .extra1 = (void *)&four,
109 .extra2 = (void *)&thirtytwo,
110 },
111 {
112 .procname = "rx_window_size",
113 .data = &rxrpc_rx_window_size,
114 .maxlen = sizeof(unsigned int),
115 .mode = 0644,
116 .proc_handler = proc_dointvec_minmax,
117 .extra1 = (void *)SYSCTL_ONE,
118 .extra2 = (void *)&n_max_acks,
119 },
120 {
121 .procname = "rx_mtu",
122 .data = &rxrpc_rx_mtu,
123 .maxlen = sizeof(unsigned int),
124 .mode = 0644,
125 .proc_handler = proc_dointvec_minmax,
126 .extra1 = (void *)SYSCTL_ONE,
127 .extra2 = (void *)&n_65535,
128 },
129 {
130 .procname = "rx_jumbo_max",
131 .data = &rxrpc_rx_jumbo_max,
132 .maxlen = sizeof(unsigned int),
133 .mode = 0644,
134 .proc_handler = proc_dointvec_minmax,
135 .extra1 = (void *)SYSCTL_ONE,
136 .extra2 = (void *)&four,
137 },
138
139 { }
140 };
141
rxrpc_sysctl_init(void)142 int __init rxrpc_sysctl_init(void)
143 {
144 rxrpc_sysctl_reg_table = register_net_sysctl(&init_net, "net/rxrpc",
145 rxrpc_sysctl_table);
146 if (!rxrpc_sysctl_reg_table)
147 return -ENOMEM;
148 return 0;
149 }
150
rxrpc_sysctl_exit(void)151 void rxrpc_sysctl_exit(void)
152 {
153 if (rxrpc_sysctl_reg_table)
154 unregister_net_sysctl_table(rxrpc_sysctl_reg_table);
155 }
156