Commit 6a6d6681 authored by Alexis Bauvin's avatar Alexis Bauvin Committed by David S. Miller
Browse files

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: default avatarAlexis Bauvin <abauvin@scaleway.com>
Reviewed-by: default avatarAmine Kherbouche <akherbouche@scaleway.com>
Reviewed-by: default avatarDavid Ahern <dsahern@gmail.com>
Tested-by: default avatarAmine Kherbouche <akherbouche@scaleway.com>
Signed-off-by: default avatarDavid S. Miller <davem@davemloft.net>
parent da5095d0

include/net/l3mdev.h

+22 −0
Original line number Diff line number Diff line
@@ -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)

{

net/l3mdev/l3mdev.c

+18 −0
Original line number Diff line number Diff line
@@ -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

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