Adds to the network namespace a device list view. This view is emptied
when the unshare is done. The view is filled/emptied by a set of
function which can be called by an external module.
Replace-Subject: [Network namespace] Network device sharing by view
Signed-off-by: Daniel Lezcano [EMAIL PROTECTED]
--
include/linux/net_ns.h |2
include/linux/net_ns_dev.h | 32 +++
init/version.c |4
net/core/Makefile |2
net/core/net_ns_dev.c | 205 +
net/net_ns.c |6 +
6 files changed, 250 insertions(+), 1 deletion(-)
Index: 2.6-mm/include/linux/net_ns_dev.h
===
--- /dev/null
+++ 2.6-mm/include/linux/net_ns_dev.h
@@ -0,0 +1,32 @@
+#ifndef _LINUX_NET_NS_DEV_H
+#define _LINUX_NET_NS_DEV_H
+
+struct net_device;
+
+struct net_ns_dev {
+ struct list_head list;
+ struct net_device *dev;
+};
+
+struct net_ns_dev_list {
+ struct list_head list;
+ rwlock_t lock;
+};
+
+extern int net_ns_dev_unregister(struct net_device *dev,
+struct net_ns_dev_list *devlist);
+
+extern int net_ns_dev_register(struct net_device *dev,
+ struct net_ns_dev_list *devlist);
+
+extern struct net_device *net_ns_dev_find_by_name(const char *devname,
+ struct net_ns_dev_list
*devlist);
+extern int net_ns_dev_remove(const char *devname,
+struct net_ns_dev_list *devlist);
+
+extern int net_ns_dev_add(const char *devname,
+ struct net_ns_dev_list *devlist);
+
+extern int free_net_ns_dev(struct net_ns_dev_list *devlist);
+
+#endif
Index: 2.6-mm/include/linux/net_ns.h
===
--- 2.6-mm.orig/include/linux/net_ns.h
+++ 2.6-mm/include/linux/net_ns.h
@@ -4,9 +4,11 @@
#include linux/kref.h
#include linux/sched.h
#include linux/nsproxy.h
+#include linux/net_ns_dev.h
struct net_namespace {
struct kref kref;
+ struct net_ns_dev_list dev_list;
};
extern struct net_namespace init_net_ns;
Index: 2.6-mm/net/core/net_ns_dev.c
===
--- /dev/null
+++ 2.6-mm/net/core/net_ns_dev.c
@@ -0,0 +1,205 @@
+/*
+ * net_ns_dev.c - adds namespace netwok device view
+ *
+ * Copyright (C) 2006 IBM
+ *
+ * Author: Daniel Lezcano [EMAIL PROTECTED]
+ *
+ * This program is free software; you can redistribute it and/or
+ * modify it under the terms of the GNU General Public License as
+ * published by the Free Software Foundation, version 2 of the
+ * License.
+ */
+#include linux/list.h
+#include linux/spinlock.h
+#include linux/netdevice.h
+#include linux/net_ns_dev.h
+
+int free_net_ns_dev(struct net_ns_dev_list *devlist)
+{
+ struct list_head *l, *next;
+ struct net_ns_dev *db;
+ struct net_device *dev;
+
+ write_lock(devlist-lock);
+ list_for_each_safe(l, next, devlist-list) {
+ db = list_entry(l, struct net_ns_dev, list);
+ dev = db-dev;
+ list_del(db-list);
+ dev_put(dev);
+ kfree(db);
+ }
+ write_unlock(devlist-lock);
+
+ return 0;
+}
+
+/*
+ * Remove a device to the namespace network devices list
+ * when registered from a namespace
+ * @dev : network device
+ * @dev_list: network namespace devices
+ * Return ENODEV if the device does not exist,
+ */
+int net_ns_dev_unregister(struct net_device *dev,
+ struct net_ns_dev_list *devlist)
+{
+ struct net_ns_dev *db;
+ struct list_head *l;
+ int ret = -ENODEV;
+
+ write_lock(devlist-lock);
+ list_for_each(l, devlist-list) {
+ db = list_entry(l, struct net_ns_dev, list);
+ if (dev != db-dev)
+ continue;
+
+ list_del(db-list);
+ dev_put(dev);
+ kfree(db);
+ ret = 0;
+ break;
+ }
+ write_unlock(devlist-lock);
+ return ret;
+}
+
+EXPORT_SYMBOL_GPL(net_ns_dev_unregister);
+
+/*
+ * Add a device to the namespace network devices list
+ * when registered from a namespace
+ * @dev : network device
+ * @dev_list: network namespace devices
+ * Return ENOMEM if allocation fails, 0 on success
+ */
+int net_ns_dev_register(struct net_device *dev,
+ struct net_ns_dev_list *devlist)
+{
+ struct net_ns_dev *db;
+
+ db = kmalloc(sizeof(*db), GFP_KERNEL);
+ if (!db)
+ return -ENOMEM;
+
+ write_lock(devlist-lock);
+ dev_hold(dev);
+ db-dev = dev;
+ list_add_tail(db-list, devlist-list);
+ write_unlock(devlist-lock);
+
+ return 0;
+}
+
+EXPORT_SYMBOL_GPL(net_ns_dev_register);
+
+/*
+ * Add a device to the namespace network devices list
+ *
