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net: rtnetlink: add linkprop commands to add and delete alternative ifnames

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Add two commands to add and delete list of link properties. Implement
the first property type along - alternative ifnames.
Each net device can have multiple alternative names.

Signed-off-by: Jiri Pirko <jiri@mellanox.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
This commit is contained in:
Jiri Pirko 2019-09-30 11:48:16 +02:00 • committed by David S. Miller
parent ff92741270
commit 36fbf1e52b
7 changed files with 177 additions and 2 deletions
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58
net/core/dev.c
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@ -245,7 +245,13 @@ static struct netdev_name_node *netdev_name_node_alloc(struct net_device *dev,
static struct netdev_name_node *
netdev_name_node_head_alloc(struct net_device *dev)
{
return netdev_name_node_alloc(dev, dev->name);
struct netdev_name_node *name_node;
name_node = netdev_name_node_alloc(dev, dev->name);
if (!name_node)
return NULL;
INIT_LIST_HEAD(&name_node->list);
return name_node;
}
static void netdev_name_node_free(struct netdev_name_node *name_node)
@ -289,6 +295,55 @@ static struct netdev_name_node *netdev_name_node_lookup_rcu(struct net *net,
return NULL;
}
int netdev_name_node_alt_create(struct net_device *dev, const char *name)
{
struct netdev_name_node *name_node;
struct net *net = dev_net(dev);
name_node = netdev_name_node_lookup(net, name);
if (name_node)
return -EEXIST;
name_node = netdev_name_node_alloc(dev, name);
if (!name_node)
return -ENOMEM;
netdev_name_node_add(net, name_node);
/* The node that holds dev->name acts as a head of per-device list. */
list_add_tail(&name_node->list, &dev->name_node->list);
return 0;
}
EXPORT_SYMBOL(netdev_name_node_alt_create);
static void __netdev_name_node_alt_destroy(struct netdev_name_node *name_node)
{
list_del(&name_node->list);
netdev_name_node_del(name_node);
kfree(name_node->name);
netdev_name_node_free(name_node);
}
int netdev_name_node_alt_destroy(struct net_device *dev, const char *name)
{
struct netdev_name_node *name_node;
struct net *net = dev_net(dev);
name_node = netdev_name_node_lookup(net, name);
if (!name_node)
return -ENOENT;
__netdev_name_node_alt_destroy(name_node);
return 0;
}
EXPORT_SYMBOL(netdev_name_node_alt_destroy);
static void netdev_name_node_alt_flush(struct net_device *dev)
{
struct netdev_name_node *name_node, *tmp;
list_for_each_entry_safe(name_node, tmp, &dev->name_node->list, list)
__netdev_name_node_alt_destroy(name_node);
}
/* Device list insertion */
static void list_netdevice(struct net_device *dev)
{
@ -8317,6 +8372,7 @@ static void rollback_registered_many(struct list_head *head)
dev_uc_flush(dev);
dev_mc_flush(dev);
netdev_name_node_alt_flush(dev);
netdev_name_node_free(dev->name_node);
if (dev->netdev_ops->ndo_uninit)