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
 13static struct ctl_table_header *rxrpc_sysctl_reg_table;
 14static const unsigned int four = 4;
 15static const unsigned int max_backlog = RXRPC_BACKLOG_MAX - 1;
 16static const unsigned int n_65535 = 65535;
 17static const unsigned int n_max_acks = 255;
 18static const unsigned long one_jiffy = 1;
 19static const unsigned long max_jiffies = MAX_JIFFY_OFFSET;
 20
 21/*
 22 * RxRPC operating parameters.
 23 *
 24 * See Documentation/networking/rxrpc.rst and the variable definitions for more
 25 * information on the individual parameters.
 26 */
 27static struct ctl_table rxrpc_sysctl_table[] = {
 28	/* Values measured in milliseconds but used in jiffies */
 29	{
 30		.procname	= "soft_ack_delay",
 31		.data		= &rxrpc_soft_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	= "idle_ack_delay",
 40		.data		= &rxrpc_idle_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_conn_expiry",
 49		.data		= &rxrpc_conn_idle_client_expiry,
 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_fast_expiry",
 58		.data		= &rxrpc_conn_idle_client_fast_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	/* Non-time values */
 67	{
 68		.procname	= "reap_client_conns",
 69		.data		= &rxrpc_reap_client_connections,
 70		.maxlen		= sizeof(unsigned int),
 71		.mode		= 0644,
 72		.proc_handler	= proc_dointvec_minmax,
 73		.extra1		= (void *)SYSCTL_ONE,
 74		.extra2		= (void *)&n_65535,
 75	},
 76	{
 77		.procname	= "max_backlog",
 78		.data		= &rxrpc_max_backlog,
 79		.maxlen		= sizeof(unsigned int),
 80		.mode		= 0644,
 81		.proc_handler	= proc_dointvec_minmax,
 82		.extra1		= (void *)&four,
 83		.extra2		= (void *)&max_backlog,
 84	},
 85	{
 86		.procname	= "rx_window_size",
 87		.data		= &rxrpc_rx_window_size,
 88		.maxlen		= sizeof(unsigned int),
 89		.mode		= 0644,
 90		.proc_handler	= proc_dointvec_minmax,
 91		.extra1		= (void *)SYSCTL_ONE,
 92		.extra2		= (void *)&n_max_acks,
 93	},
 94	{
 95		.procname	= "rx_mtu",
 96		.data		= &rxrpc_rx_mtu,
 97		.maxlen		= sizeof(unsigned int),
 98		.mode		= 0644,
 99		.proc_handler	= proc_dointvec_minmax,
100		.extra1		= (void *)SYSCTL_ONE,
101		.extra2		= (void *)&n_65535,
102	},
103	{
104		.procname	= "rx_jumbo_max",
105		.data		= &rxrpc_rx_jumbo_max,
106		.maxlen		= sizeof(unsigned int),
107		.mode		= 0644,
108		.proc_handler	= proc_dointvec_minmax,
109		.extra1		= (void *)SYSCTL_ONE,
110		.extra2		= (void *)&four,
111	},
112
113	{ }
114};
115
116int __init rxrpc_sysctl_init(void)
117{
118	rxrpc_sysctl_reg_table = register_net_sysctl(&init_net, "net/rxrpc",
119						     rxrpc_sysctl_table);
120	if (!rxrpc_sysctl_reg_table)
121		return -ENOMEM;
122	return 0;
123}
124
125void rxrpc_sysctl_exit(void)
126{
127	if (rxrpc_sysctl_reg_table)
128		unregister_net_sysctl_table(rxrpc_sysctl_reg_table);
129}