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l3mdev: add function to retreive upper master

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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>
This commit is contained in:
Alexis Bauvin
2018-12-03 10:54:39 +01:00
committed by David S. Miller
parent da5095d052
commit 6a6d6681ac
2 changed files with 40 additions and 0 deletions
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22
include/net/l3mdev.h
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@@ -101,6 +101,17 @@ struct net_device *l3mdev_master_dev_rcu(const struct net_device *_dev)
return master;
}
int l3mdev_master_upper_ifindex_by_index_rcu(struct net *net, int ifindex);
static inline
int l3mdev_master_upper_ifindex_by_index(struct net *net, int ifindex)
{
rcu_read_lock();
ifindex = l3mdev_master_upper_ifindex_by_index_rcu(net, ifindex);
rcu_read_unlock();
return ifindex;
}
u32 l3mdev_fib_table_rcu(const struct net_device *dev);
u32 l3mdev_fib_table_by_index(struct net *net, int ifindex);
static inline u32 l3mdev_fib_table(const struct net_device *dev)
@@ -207,6 +218,17 @@ static inline int l3mdev_master_ifindex_by_index(struct net *net, int ifindex)
return 0;
}
static inline
int l3mdev_master_upper_ifindex_by_index_rcu(struct net *net, int ifindex)
{
return 0;
}
static inline
int l3mdev_master_upper_ifindex_by_index(struct net *net, int ifindex)
{
return 0;
}
static inline
struct net_device *l3mdev_master_dev_rcu(const struct net_device *dev)
{