5dd3df105b
This makes it clearer which sysctls are relative to your current network namespace. This makes it a little less error prone by not exposing sysctls for the initial network namespace in other namespaces. This is the same way we handle all of our other network interfaces to userspace and I can't honestly remember why we didn't do this for sysctls right from the start. Signed-off-by: Eric W. Biederman <ebiederm@xmission.com> Acked-by: Pavel Emelyanov <xemul@parallels.com> Signed-off-by: David S. Miller <davem@davemloft.net>
117 lines
2.9 KiB
C
117 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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#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(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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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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static struct ctl_path phonet_ctl_path[] = {
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{ .procname = "net", },
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{ .procname = "phonet", },
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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_table(&init_net, 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_net_sysctl_table(phonet_table_hrd);
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}
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