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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>
hifive-unleashed-5.1
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
View File

@ -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)
{

18
net/l3mdev/l3mdev.c
View File

@ -46,6 +46,24 @@ int l3mdev_master_ifindex_rcu(const struct net_device *dev)
}
EXPORT_SYMBOL_GPL(l3mdev_master_ifindex_rcu);
/**
* l3mdev_master_upper_ifindex_by_index - get index of upper l3 master
* device
* @net: network namespace for device index lookup
* @ifindex: targeted interface
*/
int l3mdev_master_upper_ifindex_by_index_rcu(struct net *net, int ifindex)
{
struct net_device *dev;
dev = dev_get_by_index_rcu(net, ifindex);
while (dev && !netif_is_l3_master(dev))
dev = netdev_master_upper_dev_get(dev);
return dev ? dev->ifindex : 0;
}
EXPORT_SYMBOL_GPL(l3mdev_master_upper_ifindex_by_index_rcu);
/**
* l3mdev_fib_table - get FIB table id associated with an L3
* master interface