return &net->dev_index_head[ifindex & ((1 << NETDEV_HASHBITS) - 1)];
}
+/* Device list insertion */
+static int list_netdevice(struct net_device *dev)
+{
+ struct net *net = dev->nd_net;
+
+ ASSERT_RTNL();
+
+ write_lock_bh(&dev_base_lock);
+ list_add_tail(&dev->dev_list, &net->dev_base_head);
+ hlist_add_head(&dev->name_hlist, dev_name_hash(net, dev->name));
+ hlist_add_head(&dev->index_hlist, dev_index_hash(net, dev->ifindex));
+ write_unlock_bh(&dev_base_lock);
+ return 0;
+}
+
+/* Device list removal */
+static void unlist_netdevice(struct net_device *dev)
+{
+ ASSERT_RTNL();
+
+ /* Unlink dev from the device chain */
+ write_lock_bh(&dev_base_lock);
+ list_del(&dev->dev_list);
+ hlist_del(&dev->name_hlist);
+ hlist_del(&dev->index_hlist);
+ write_unlock_bh(&dev_base_lock);
+}
+
/*
* Our notifier list
*/
}
/**
- * dev_alloc_name - allocate a name for a device
- * @dev: device
+ * __dev_alloc_name - allocate a name for a device
+ * @net: network namespace to allocate the device name in
* @name: name format string
+ * @buf: scratch buffer and result name string
*
* Passed a format string - eg "lt%d" it will try and find a suitable
* id. It scans list of devices to build up a free map, then chooses
* Returns the number of the unit assigned or a negative errno code.
*/
-int dev_alloc_name(struct net_device *dev, const char *name)
+static int __dev_alloc_name(struct net *net, const char *name, char *buf)
{
int i = 0;
- char buf[IFNAMSIZ];
const char *p;
const int max_netdevices = 8*PAGE_SIZE;
long *inuse;
struct net_device *d;
- struct net *net;
-
- BUG_ON(!dev->nd_net);
- net = dev->nd_net;
p = strnchr(name, IFNAMSIZ-1, '%');
if (p) {
continue;
/* avoid cases where sscanf is not exact inverse of printf */
- snprintf(buf, sizeof(buf), name, i);
+ snprintf(buf, IFNAMSIZ, name, i);
if (!strncmp(buf, d->name, IFNAMSIZ))
set_bit(i, inuse);
}
free_page((unsigned long) inuse);
}
- snprintf(buf, sizeof(buf), name, i);
- if (!__dev_get_by_name(net, buf)) {
- strlcpy(dev->name, buf, IFNAMSIZ);
+ snprintf(buf, IFNAMSIZ, name, i);
+ if (!__dev_get_by_name(net, buf))
return i;
- }
/* It is possible to run out of possible slots
* when the name is long and there isn't enough space left
return -ENFILE;
}
+/**
+ * dev_alloc_name - allocate a name for a device
+ * @dev: device
+ * @name: name format string
+ *
+ * Passed a format string - eg "lt%d" it will try and find a suitable
+ * id. It scans list of devices to build up a free map, then chooses
+ * the first empty slot. The caller must hold the dev_base or rtnl lock
+ * while allocating the name and adding the device in order to avoid
+ * duplicates.
+ * Limited to bits_per_byte * page size devices (ie 32K on most platforms).
+ * Returns the number of the unit assigned or a negative errno code.
+ */
+
+int dev_alloc_name(struct net_device *dev, const char *name)
+{
+ char buf[IFNAMSIZ];
+ struct net *net;
+ int ret;
+
+ BUG_ON(!dev->nd_net);
+ net = dev->nd_net;
+ ret = __dev_alloc_name(net, name, buf);
+ if (ret >= 0)
+ strlcpy(dev->name, buf, IFNAMSIZ);
+ return ret;
+}
+
/**
* dev_change_name - change name of a device
*/
int dev_close(struct net_device *dev)
{
+ might_sleep();
+
if (!(dev->flags & IFF_UP))
return 0;
res = seq_open(file, &dev_seq_ops);
if (!res) {
seq = file->private_data;
- seq->private = get_net(PROC_NET(inode));
+ seq->private = get_proc_net(inode);
+ if (!seq->private) {
+ seq_release(inode, file);
+ res = -ENXIO;
+ }
}
return res;
}
set_bit(__LINK_STATE_PRESENT, &dev->state);
dev_init_scheduler(dev);
- write_lock_bh(&dev_base_lock);
- list_add_tail(&dev->dev_list, &net->dev_base_head);
- hlist_add_head(&dev->name_hlist, head);
- hlist_add_head(&dev->index_hlist, dev_index_hash(net, dev->ifindex));
dev_hold(dev);
- write_unlock_bh(&dev_base_lock);
+ list_netdevice(dev);
/* Notify protocols, that a new device appeared. */
ret = raw_notifier_call_chain(&netdev_chain, NETDEV_REGISTER, dev);
dev_close(dev);
/* And unlink it from device chain. */
- write_lock_bh(&dev_base_lock);
- list_del(&dev->dev_list);
- hlist_del(&dev->name_hlist);
- hlist_del(&dev->index_hlist);
- write_unlock_bh(&dev_base_lock);
+ unlist_netdevice(dev);
dev->reg_state = NETREG_UNREGISTERING;
EXPORT_SYMBOL(unregister_netdev);
+/**
+ * dev_change_net_namespace - move device to different nethost namespace
+ * @dev: device
+ * @net: network namespace
+ * @pat: If not NULL name pattern to try if the current device name
+ * is already taken in the destination network namespace.
+ *
+ * This function shuts down a device interface and moves it
+ * to a new network namespace. On success 0 is returned, on
+ * a failure a netagive errno code is returned.
+ *
+ * Callers must hold the rtnl semaphore.
+ */
+
+int dev_change_net_namespace(struct net_device *dev, struct net *net, const char *pat)
+{
+ char buf[IFNAMSIZ];
+ const char *destname;
+ int err;
+
+ ASSERT_RTNL();
+
+ /* Don't allow namespace local devices to be moved. */
+ err = -EINVAL;
+ if (dev->features & NETIF_F_NETNS_LOCAL)
+ goto out;
+
+ /* Ensure the device has been registrered */
+ err = -EINVAL;
+ if (dev->reg_state != NETREG_REGISTERED)
+ goto out;
+
+ /* Get out if there is nothing todo */
+ err = 0;
+ if (dev->nd_net == net)
+ goto out;
+
+ /* Pick the destination device name, and ensure
+ * we can use it in the destination network namespace.
+ */
+ err = -EEXIST;
+ destname = dev->name;
+ if (__dev_get_by_name(net, destname)) {
+ /* We get here if we can't use the current device name */
+ if (!pat)
+ goto out;
+ if (!dev_valid_name(pat))
+ goto out;
+ if (strchr(pat, '%')) {
+ if (__dev_alloc_name(net, pat, buf) < 0)
+ goto out;
+ destname = buf;
+ } else
+ destname = pat;
+ if (__dev_get_by_name(net, destname))
+ goto out;
+ }
+
+ /*
+ * And now a mini version of register_netdevice unregister_netdevice.
+ */
+
+ /* If device is running close it first. */
+ if (dev->flags & IFF_UP)
+ dev_close(dev);
+
+ /* And unlink it from device chain */
+ err = -ENODEV;
+ unlist_netdevice(dev);
+
+ synchronize_net();
+
+ /* Shutdown queueing discipline. */
+ dev_shutdown(dev);
+
+ /* Notify protocols, that we are about to destroy
+ this device. They should clean all the things.
+ */
+ call_netdevice_notifiers(NETDEV_UNREGISTER, dev);
+
+ /*
+ * Flush the unicast and multicast chains
+ */
+ dev_addr_discard(dev);
+
+ /* Actually switch the network namespace */
+ dev->nd_net = net;
+
+ /* Assign the new device name */
+ if (destname != dev->name)
+ strcpy(dev->name, destname);
+
+ /* If there is an ifindex conflict assign a new one */
+ if (__dev_get_by_index(net, dev->ifindex)) {
+ int iflink = (dev->iflink == dev->ifindex);
+ dev->ifindex = dev_new_index(net);
+ if (iflink)
+ dev->iflink = dev->ifindex;
+ }
+
+ /* Fixup sysfs */
+ err = device_rename(&dev->dev, dev->name);
+ BUG_ON(err);
+
+ /* Add the device back in the hashes */
+ list_netdevice(dev);
+
+ /* Notify protocols, that a new device appeared. */
+ call_netdevice_notifiers(NETDEV_REGISTER, dev);
+
+ synchronize_net();
+ err = 0;
+out:
+ return err;
+}
+
static int dev_cpu_callback(struct notifier_block *nfb,
unsigned long action,
void *ocpu)
.exit = netdev_exit,
};
+static void default_device_exit(struct net *net)
+{
+ struct net_device *dev, *next;
+ /*
+ * Push all migratable of the network devices back to the
+ * initial network namespace
+ */
+ rtnl_lock();
+ for_each_netdev_safe(net, dev, next) {
+ int err;
+
+ /* Ignore unmoveable devices (i.e. loopback) */
+ if (dev->features & NETIF_F_NETNS_LOCAL)
+ continue;
+
+ /* Push remaing network devices to init_net */
+ err = dev_change_net_namespace(dev, &init_net, "dev%d");
+ if (err) {
+ printk(KERN_WARNING "%s: failed to move %s to init_net: %d\n",
+ __func__, dev->name, err);
+ unregister_netdevice(dev);
+ }
+ }
+ rtnl_unlock();
+}
+
+static struct pernet_operations default_device_ops = {
+ .exit = default_device_exit,
+};
+
/*
* Initialize the DEV module. At boot time this walks the device list and
* unhooks any devices that fail to initialise (normally hardware not
if (register_pernet_subsys(&netdev_net_ops))
goto out;
+ if (register_pernet_device(&default_device_ops))
+ goto out;
+
/*
* Initialise the packet receive queues.
*/
projects / linux-2.6 / blobdiff