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net: introduce a function to check if a netdev name is in use
[ Upstream commit75ea27d0d6
] __dev_get_by_name is currently used to either retrieve a net device reference using its name or to check if a name is already used by a registered net device (per ns). In the later case there is no need to return a reference to a net device. Introduce a new helper, netdev_name_in_use, to check if a name is currently used by a registered net device without leaking a reference the corresponding net device. This helper uses netdev_name_node_lookup instead of __dev_get_by_name as we don't need the extra logic retrieving a reference to the corresponding net device. Signed-off-by: Antoine Tenart <atenart@kernel.org> Signed-off-by: David S. Miller <davem@davemloft.net> Stable-dep-of:311cca4066
("net: fix ifname in netlink ntf during netns move") Signed-off-by: Sasha Levin <sashal@kernel.org>
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parent
38ba547935
commit
30e2db4030
2 changed files with 11 additions and 4 deletions
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@ -2978,6 +2978,7 @@ struct net_device *__dev_get_by_flags(struct net *net, unsigned short flags,
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struct net_device *dev_get_by_name(struct net *net, const char *name);
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struct net_device *dev_get_by_name_rcu(struct net *net, const char *name);
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struct net_device *__dev_get_by_name(struct net *net, const char *name);
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bool netdev_name_in_use(struct net *net, const char *name);
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int dev_alloc_name(struct net_device *dev, const char *name);
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int dev_open(struct net_device *dev, struct netlink_ext_ack *extack);
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void dev_close(struct net_device *dev);
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@ -303,6 +303,12 @@ static struct netdev_name_node *netdev_name_node_lookup_rcu(struct net *net,
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return NULL;
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}
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bool netdev_name_in_use(struct net *net, const char *name)
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{
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return netdev_name_node_lookup(net, name);
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}
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EXPORT_SYMBOL(netdev_name_in_use);
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int netdev_name_node_alt_create(struct net_device *dev, const char *name)
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{
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struct netdev_name_node *name_node;
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@ -1135,7 +1141,7 @@ static int __dev_alloc_name(struct net *net, const char *name, char *buf)
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}
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snprintf(buf, IFNAMSIZ, name, i);
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if (!__dev_get_by_name(net, buf))
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if (!netdev_name_in_use(net, buf))
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return i;
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/* It is possible to run out of possible slots
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@ -1189,7 +1195,7 @@ static int dev_get_valid_name(struct net *net, struct net_device *dev,
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if (strchr(name, '%'))
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return dev_alloc_name_ns(net, dev, name);
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else if (__dev_get_by_name(net, name))
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else if (netdev_name_in_use(net, name))
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return -EEXIST;
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else if (dev->name != name)
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strlcpy(dev->name, name, IFNAMSIZ);
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@ -11170,7 +11176,7 @@ int __dev_change_net_namespace(struct net_device *dev, struct net *net,
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* we can use it in the destination network namespace.
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*/
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err = -EEXIST;
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if (__dev_get_by_name(net, dev->name)) {
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if (netdev_name_in_use(net, dev->name)) {
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/* We get here if we can't use the current device name */
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if (!pat)
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goto out;
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@ -11522,7 +11528,7 @@ static void __net_exit default_device_exit(struct net *net)
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/* Push remaining network devices to init_net */
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snprintf(fb_name, IFNAMSIZ, "dev%d", dev->ifindex);
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if (__dev_get_by_name(&init_net, fb_name))
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if (netdev_name_in_use(&init_net, fb_name))
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snprintf(fb_name, IFNAMSIZ, "dev%%d");
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err = dev_change_net_namespace(dev, &init_net, fb_name);
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if (err) {
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