l3mdev: add function to retreive upper master
Existing functions to retreive the l3mdev of a device did not walk the master chain to find the upper master. This patch adds a function to find the l3mdev, even indirect through e.g. a bridge: +----------+ | | | vrf-blue | | | +----+-----+ | | +----+-----+ | | | br-blue | | | +----+-----+ | | +----+-----+ | | | eth0 | | | +----------+ This will properly resolve the l3mdev of eth0 to vrf-blue. Signed-off-by: Alexis Bauvin <abauvin@scaleway.com> Reviewed-by: Amine Kherbouche <akherbouche@scaleway.com> Reviewed-by: David Ahern <dsahern@gmail.com> Tested-by: Amine Kherbouche <akherbouche@scaleway.com> Signed-off-by: David S. Miller <davem@davemloft.net>
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@ -101,6 +101,17 @@ struct net_device *l3mdev_master_dev_rcu(const struct net_device *_dev)
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return master;
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}
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int l3mdev_master_upper_ifindex_by_index_rcu(struct net *net, int ifindex);
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static inline
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int l3mdev_master_upper_ifindex_by_index(struct net *net, int ifindex)
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{
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rcu_read_lock();
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ifindex = l3mdev_master_upper_ifindex_by_index_rcu(net, ifindex);
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rcu_read_unlock();
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return ifindex;
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}
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u32 l3mdev_fib_table_rcu(const struct net_device *dev);
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u32 l3mdev_fib_table_by_index(struct net *net, int ifindex);
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static inline u32 l3mdev_fib_table(const struct net_device *dev)
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@ -207,6 +218,17 @@ static inline int l3mdev_master_ifindex_by_index(struct net *net, int ifindex)
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return 0;
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}
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static inline
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int l3mdev_master_upper_ifindex_by_index_rcu(struct net *net, int ifindex)
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{
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return 0;
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}
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static inline
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int l3mdev_master_upper_ifindex_by_index(struct net *net, int ifindex)
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{
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return 0;
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}
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static inline
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struct net_device *l3mdev_master_dev_rcu(const struct net_device *dev)
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{
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@ -46,6 +46,24 @@ int l3mdev_master_ifindex_rcu(const struct net_device *dev)
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}
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EXPORT_SYMBOL_GPL(l3mdev_master_ifindex_rcu);
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/**
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* l3mdev_master_upper_ifindex_by_index - get index of upper l3 master
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* device
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* @net: network namespace for device index lookup
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* @ifindex: targeted interface
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*/
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int l3mdev_master_upper_ifindex_by_index_rcu(struct net *net, int ifindex)
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{
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struct net_device *dev;
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dev = dev_get_by_index_rcu(net, ifindex);
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while (dev && !netif_is_l3_master(dev))
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dev = netdev_master_upper_dev_get(dev);
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return dev ? dev->ifindex : 0;
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}
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EXPORT_SYMBOL_GPL(l3mdev_master_upper_ifindex_by_index_rcu);
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/**
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* l3mdev_fib_table - get FIB table id associated with an L3
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* master interface
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