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Message-Id: <1222098445-26175-9-git-send-email-remi.denis-courmont@nokia.com>
Date: Mon, 22 Sep 2008 18:47:23 +0300
From: Rémi Denis-Courmont
<remi.denis-courmont@...ia.com>
To: netdev@...r.kernel.org
Subject: [PATCH 09/11] 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: Remi Denis-Courmont <remi.denis-courmont@...ia.com>
---
include/net/phonet/phonet.h | 3 +
net/phonet/Makefile | 1 +
net/phonet/af_phonet.c | 3 +
net/phonet/socket.c | 3 +-
net/phonet/sysctl.c | 113 +++++++++++++++++++++++++++++++++++++++++++
5 files changed, 122 insertions(+), 1 deletions(-)
create mode 100644 net/phonet/sysctl.c
diff --git a/include/net/phonet/phonet.h b/include/net/phonet/phonet.h
index d3957d3..1c6f7e7 100644
--- a/include/net/phonet/phonet.h
+++ b/include/net/phonet/phonet.h
@@ -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);
diff --git a/net/phonet/Makefile b/net/phonet/Makefile
index d218abc..ae9c3ed 100644
--- a/net/phonet/Makefile
+++ b/net/phonet/Makefile
@@ -5,4 +5,5 @@ phonet-objs := \
pn_netlink.o \
socket.o \
datagram.o \
+ sysctl.o \
af_phonet.o
diff --git a/net/phonet/af_phonet.c b/net/phonet/af_phonet.c
index 51397ff..50dc258 100644
--- a/net/phonet/af_phonet.c
+++ b/net/phonet/af_phonet.c
@@ -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 @@ err:
static void __exit phonet_exit(void)
{
isi_unregister();
+ phonet_sysctl_exit();
sock_unregister(AF_PHONET);
dev_remove_pack(&phonet_packet_type);
phonet_device_exit();
diff --git a/net/phonet/socket.c b/net/phonet/socket.c
index 99a4945..dfd4061 100644
--- a/net/phonet/socket.c
+++ b/net/phonet/socket.c
@@ -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)
diff --git a/net/phonet/sysctl.c b/net/phonet/sysctl.c
new file mode 100644
index 0000000..600a430
--- /dev/null
+++ b/net/phonet/sysctl.c
@@ -0,0 +1,113 @@
+/*
+ * File: sysctl.c
+ *
+ * Phonet /proc/sys/net/phonet interface implementation
+ *
+ * Copyright (C) 2008 Nokia Corporation.
+ *
+ * Contact: Remi Denis-Courmont <remi.denis-courmont@...ia.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);
+}
--
1.5.4.3
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