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2b27bdcc20
Based on 1 normalized pattern(s): this program is free software you can redistribute it and or modify it under the terms of the gnu general public license version 2 as published by the free software foundation this program is distributed in the hope that it will be useful but without any warranty without even the implied warranty of merchantability or fitness for a particular purpose see the gnu general public license for more details you should have received a copy of the gnu general public license along with this program if not write to the free software foundation inc 51 franklin st fifth floor boston ma 02110 1301 usa extracted by the scancode license scanner the SPDX license identifier GPL-2.0-only has been chosen to replace the boilerplate/reference in 246 file(s). Signed-off-by: Thomas Gleixner <tglx@linutronix.de> Reviewed-by: Alexios Zavras <alexios.zavras@intel.com> Reviewed-by: Allison Randal <allison@lohutok.net> Cc: linux-spdx@vger.kernel.org Link: https://lkml.kernel.org/r/20190530000436.674189849@linutronix.de Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
97 lines
2.2 KiB
C
97 lines
2.2 KiB
C
// SPDX-License-Identifier: GPL-2.0-only
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/*
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* File: sysctl.c
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*
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* Phonet /proc/sys/net/phonet interface implementation
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*
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* Copyright (C) 2008 Nokia Corporation.
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*
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* Author: Rémi Denis-Courmont
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*/
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#include <linux/seqlock.h>
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#include <linux/sysctl.h>
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#include <linux/errno.h>
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#include <linux/init.h>
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#include <net/sock.h>
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#include <linux/phonet.h>
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#include <net/phonet/phonet.h>
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#define DYNAMIC_PORT_MIN 0x40
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#define DYNAMIC_PORT_MAX 0x7f
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static DEFINE_SEQLOCK(local_port_range_lock);
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static int local_port_range_min[2] = {0, 0};
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static int local_port_range_max[2] = {1023, 1023};
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static int local_port_range[2] = {DYNAMIC_PORT_MIN, DYNAMIC_PORT_MAX};
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static struct ctl_table_header *phonet_table_hrd;
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static void set_local_port_range(int range[2])
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{
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write_seqlock(&local_port_range_lock);
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local_port_range[0] = range[0];
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local_port_range[1] = range[1];
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write_sequnlock(&local_port_range_lock);
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}
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void phonet_get_local_port_range(int *min, int *max)
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{
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unsigned int seq;
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do {
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seq = read_seqbegin(&local_port_range_lock);
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if (min)
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*min = local_port_range[0];
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if (max)
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*max = local_port_range[1];
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} while (read_seqretry(&local_port_range_lock, seq));
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}
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static int proc_local_port_range(struct ctl_table *table, int write,
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void __user *buffer,
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size_t *lenp, loff_t *ppos)
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{
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int ret;
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int range[2] = {local_port_range[0], local_port_range[1]};
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struct ctl_table tmp = {
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.data = &range,
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.maxlen = sizeof(range),
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.mode = table->mode,
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.extra1 = &local_port_range_min,
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.extra2 = &local_port_range_max,
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};
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ret = proc_dointvec_minmax(&tmp, write, buffer, lenp, ppos);
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if (write && ret == 0) {
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if (range[1] < range[0])
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ret = -EINVAL;
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else
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set_local_port_range(range);
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}
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return ret;
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}
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static struct ctl_table phonet_table[] = {
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{
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.procname = "local_port_range",
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.data = &local_port_range,
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.maxlen = sizeof(local_port_range),
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.mode = 0644,
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.proc_handler = proc_local_port_range,
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},
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{ }
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};
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int __init phonet_sysctl_init(void)
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{
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phonet_table_hrd = register_net_sysctl(&init_net, "net/phonet", phonet_table);
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return phonet_table_hrd == NULL ? -ENOMEM : 0;
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}
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void phonet_sysctl_exit(void)
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{
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unregister_net_sysctl_table(phonet_table_hrd);
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}
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