提交 87ab4e20 编写于 作者: R Remi Denis-Courmont 提交者: David S. Miller

Phonet: proc interface for port range

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: NRemi Denis-Courmont <remi.denis-courmont@nokia.com>
Signed-off-by: NDavid S. Miller <davem@davemloft.net>
上级 5f77076d
......@@ -47,6 +47,7 @@ static inline struct pn_sock *pn_sk(struct sock *sk)
extern const struct proto_ops phonet_dgram_ops;
struct sock *pn_find_sock_by_sa(const struct sockaddr_pn *sa);
void phonet_get_local_port_range(int *min, int *max);
void pn_sock_hash(struct sock *sk);
void pn_sock_unhash(struct sock *sk);
int pn_sock_get_port(struct sock *sk, unsigned short sport);
......@@ -97,6 +98,8 @@ struct phonet_protocol {
int phonet_proto_register(int protocol, struct phonet_protocol *pp);
void phonet_proto_unregister(int protocol, struct phonet_protocol *pp);
int phonet_sysctl_init(void);
void phonet_sysctl_exit(void);
void phonet_netlink_register(void);
int isi_register(void);
void isi_unregister(void);
......
......@@ -5,4 +5,5 @@ phonet-objs := \
pn_netlink.o \
socket.o \
datagram.o \
sysctl.o \
af_phonet.o
......@@ -350,6 +350,7 @@ static int __init phonet_init(void)
phonet_device_init();
dev_add_pack(&phonet_packet_type);
phonet_netlink_register();
phonet_sysctl_init();
err = isi_register();
if (err)
......@@ -357,6 +358,7 @@ static int __init phonet_init(void)
return 0;
err:
phonet_sysctl_exit();
sock_unregister(AF_PHONET);
dev_remove_pack(&phonet_packet_type);
phonet_device_exit();
......@@ -366,6 +368,7 @@ static int __init phonet_init(void)
static void __exit phonet_exit(void)
{
isi_unregister();
phonet_sysctl_exit();
sock_unregister(AF_PHONET);
dev_remove_pack(&phonet_packet_type);
phonet_device_exit();
......
......@@ -273,8 +273,9 @@ int pn_sock_get_port(struct sock *sk, unsigned short sport)
if (!sport) {
/* search free port */
int port, pmin = 0x40, pmax = 0x7f;
int port, pmin, pmax;
phonet_get_local_port_range(&pmin, &pmax);
for (port = pmin; port <= pmax; port++) {
port_cur++;
if (port_cur < pmin || port_cur > pmax)
......
/*
* File: sysctl.c
*
* Phonet /proc/sys/net/phonet interface implementation
*
* Copyright (C) 2008 Nokia Corporation.
*
* Contact: Remi Denis-Courmont <remi.denis-courmont@nokia.com>
*
* 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
*/
#include <linux/seqlock.h>
#include <linux/sysctl.h>
#include <linux/errno.h>
#include <linux/init.h>
#define DYNAMIC_PORT_MIN 0x40
#define DYNAMIC_PORT_MAX 0x7f
static DEFINE_SEQLOCK(local_port_range_lock);
static int local_port_range_min[2] = {0, 0};
static int local_port_range_max[2] = {1023, 1023};
static int local_port_range[2] = {DYNAMIC_PORT_MIN, DYNAMIC_PORT_MAX};
static struct ctl_table_header *phonet_table_hrd;
static void set_local_port_range(int range[2])
{
write_seqlock(&local_port_range_lock);
local_port_range[0] = range[0];
local_port_range[1] = range[1];
write_sequnlock(&local_port_range_lock);
}
void phonet_get_local_port_range(int *min, int *max)
{
unsigned seq;
do {
seq = read_seqbegin(&local_port_range_lock);
if (min)
*min = local_port_range[0];
if (max)
*max = local_port_range[1];
} while (read_seqretry(&local_port_range_lock, seq));
}
static int proc_local_port_range(ctl_table *table, int write, struct file *filp,
void __user *buffer,
size_t *lenp, loff_t *ppos)
{
int ret;
int range[2] = {local_port_range[0], local_port_range[1]};
ctl_table tmp = {
.data = &range,
.maxlen = sizeof(range),
.mode = table->mode,
.extra1 = &local_port_range_min,
.extra2 = &local_port_range_max,
};
ret = proc_dointvec_minmax(&tmp, write, filp, buffer, lenp, ppos);
if (write && ret == 0) {
if (range[1] < range[0])
ret = -EINVAL;
else
set_local_port_range(range);
}
return ret;
}
static struct ctl_table phonet_table[] = {
{
.ctl_name = CTL_UNNUMBERED,
.procname = "local_port_range",
.data = &local_port_range,
.maxlen = sizeof(local_port_range),
.mode = 0644,
.proc_handler = &proc_local_port_range,
.strategy = NULL,
},
{ .ctl_name = 0 }
};
struct ctl_path phonet_ctl_path[] = {
{ .procname = "net", .ctl_name = CTL_NET, },
{ .procname = "phonet", .ctl_name = CTL_UNNUMBERED, },
{ },
};
int __init phonet_sysctl_init(void)
{
phonet_table_hrd = register_sysctl_paths(phonet_ctl_path, phonet_table);
return phonet_table_hrd == NULL ? -ENOMEM : 0;
}
void phonet_sysctl_exit(void)
{
unregister_sysctl_table(phonet_table_hrd);
}
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