diff options
| author | Alexis Bauvin <abauvin@scaleway.com> | 2018-12-03 10:54:39 +0100 |
|---|---|---|
| committer | David S. Miller <davem@davemloft.net> | 2018-12-03 14:15:26 -0800 |
| commit | 6a6d6681ac1add9655b7ab5dd0b46b54aeb1b44f (patch) | |
| tree | f35b58db6fd9aee9d5801b9891869f1335a322cb /net/l3mdev | |
| parent | da5095d052860baa7fe2932fb1209628dd3e3813 (diff) | |
| download | linux-6a6d6681ac1add9655b7ab5dd0b46b54aeb1b44f.tar.bz2 | |
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>
Diffstat (limited to 'net/l3mdev')
| -rw-r--r-- | net/l3mdev/l3mdev.c | 18 |
1 files changed, 18 insertions, 0 deletions
diff --git a/net/l3mdev/l3mdev.c b/net/l3mdev/l3mdev.c index 8da86ceca33d..309dee76724e 100644 --- a/net/l3mdev/l3mdev.c +++ b/net/l3mdev/l3mdev.c @@ -47,6 +47,24 @@ 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 * @dev: targeted interface |