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96 lines
2.2 KiB
96 lines
2.2 KiB
// 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 *buffer, 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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