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net: introduce dev_net notifier register/unregister variants 

Introduce dev_net variants of netdev notifier register/unregister functions
and allow per-net notifier to follow the netdevice into the namespace it is
moved to.

Signed-off-by: Jiri Pirko <jiri@mellanox.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
This commit is contained in:
Jiri Pirko 2020-01-25 12:17:08 +01:00 committed by David S. Miller
parent 1f637703d8
commit 93642e14bd
2 changed files with 63 additions and 0 deletions
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17
include/linux/netdevice.h
View File

@ -939,6 +939,11 @@ struct netdev_name_node {
int netdev_name_node_alt_create(struct net_device *dev, const char *name);
int netdev_name_node_alt_destroy(struct net_device *dev, const char *name);
struct netdev_net_notifier {
struct list_head list;
struct notifier_block *nb;
};
/*
* This structure defines the management hooks for network devices.
* The following hooks can be defined; unless noted otherwise, they are
@ -1793,6 +1798,10 @@ enum netdev_priv_flags {
*
* @wol_enabled: Wake-on-LAN is enabled
*
* @net_notifier_list: List of per-net netdev notifier block
* that follow this device when it is moved
* to another network namespace.
*
* FIXME: cleanup struct net_device such that network protocol info
* moves out.
*/
@ -2085,6 +2094,8 @@ struct net_device {
struct lock_class_key addr_list_lock_key;
bool proto_down;
unsigned wol_enabled:1;
struct list_head net_notifier_list;
};
#define to_net_dev(d) container_of(d, struct net_device, dev)
@ -2529,6 +2540,12 @@ int unregister_netdevice_notifier(struct notifier_block *nb);
int register_netdevice_notifier_net(struct net *net, struct notifier_block *nb);
int unregister_netdevice_notifier_net(struct net *net,
struct notifier_block *nb);
int register_netdevice_notifier_dev_net(struct net_device *dev,
struct notifier_block *nb,
struct netdev_net_notifier *nn);
int unregister_netdevice_notifier_dev_net(struct net_device *dev,
struct notifier_block *nb,
struct netdev_net_notifier *nn);
struct netdev_notifier_info {
struct net_device *dev;

46
net/core/dev.c
View File

@ -1874,6 +1874,48 @@ int unregister_netdevice_notifier_net(struct net *net,
}
EXPORT_SYMBOL(unregister_netdevice_notifier_net);
int register_netdevice_notifier_dev_net(struct net_device *dev,
struct notifier_block *nb,
struct netdev_net_notifier *nn)
{
int err;
rtnl_lock();
err = __register_netdevice_notifier_net(dev_net(dev), nb, false);
if (!err) {
nn->nb = nb;
list_add(&nn->list, &dev->net_notifier_list);
}
rtnl_unlock();
return err;
}
EXPORT_SYMBOL(register_netdevice_notifier_dev_net);
int unregister_netdevice_notifier_dev_net(struct net_device *dev,
struct notifier_block *nb,
struct netdev_net_notifier *nn)
{
int err;
rtnl_lock();
list_del(&nn->list);
err = __unregister_netdevice_notifier_net(dev_net(dev), nb);
rtnl_unlock();
return err;
}
EXPORT_SYMBOL(unregister_netdevice_notifier_dev_net);
static void move_netdevice_notifiers_dev_net(struct net_device *dev,
struct net *net)
{
struct netdev_net_notifier *nn;
list_for_each_entry(nn, &dev->net_notifier_list, list) {
__unregister_netdevice_notifier_net(dev_net(dev), nn->nb);
__register_netdevice_notifier_net(net, nn->nb, true);
}
}
/**
* call_netdevice_notifiers_info - call all network notifier blocks
* @val: value passed unmodified to notifier function
@ -9786,6 +9828,7 @@ struct net_device *alloc_netdev_mqs(int sizeof_priv, const char *name,
INIT_LIST_HEAD(&dev->adj_list.lower);
INIT_LIST_HEAD(&dev->ptype_all);
INIT_LIST_HEAD(&dev->ptype_specific);
INIT_LIST_HEAD(&dev->net_notifier_list);
#ifdef CONFIG_NET_SCHED
hash_init(dev->qdisc_hash);
#endif
@ -10049,6 +10092,9 @@ int dev_change_net_namespace(struct net_device *dev, struct net *net, const char
kobject_uevent(&dev->dev.kobj, KOBJ_REMOVE);
netdev_adjacent_del_links(dev);
/* Move per-net netdevice notifiers that are following the netdevice */
move_netdevice_notifiers_dev_net(dev, net);
/* Actually switch the network namespace */
dev_net_set(dev, net);
dev->ifindex = new_ifindex;