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Phonet endpoints are bound to individual ports. This provides a /proc/sys/net/phonet (or sysctl) interface for selecting the range of automatically allocated ports (much like the ip_local_port_range with IPv4). Signed-off-by: Remi Denis-Courmont <remi.denis-courmont@nokia.com> Signed-off-by: David S. Miller <davem@davemloft.net>
114 lines
2.9 KiB
C
114 lines
2.9 KiB
C
/*
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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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* Contact: Remi Denis-Courmont <remi.denis-courmont@nokia.com>
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*
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* This program is free software; you can redistribute it and/or
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* modify it under the terms of the GNU General Public License
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* version 2 as published by the Free Software Foundation.
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*
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* This program is distributed in the hope that it will be useful, but
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* WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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* General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License
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* along with this program; if not, write to the Free Software
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* Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA
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* 02110-1301 USA
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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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#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 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(ctl_table *table, int write, struct file *filp,
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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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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, filp, 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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.ctl_name = CTL_UNNUMBERED,
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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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.strategy = NULL,
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},
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{ .ctl_name = 0 }
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};
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struct ctl_path phonet_ctl_path[] = {
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{ .procname = "net", .ctl_name = CTL_NET, },
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{ .procname = "phonet", .ctl_name = CTL_UNNUMBERED, },
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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_sysctl_paths(phonet_ctl_path, 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_sysctl_table(phonet_table_hrd);
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}
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