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net: GRE: Add is_gretap_dev, is_ip6gretap_dev

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Determining whether a device is a GRE device is easily done by
inspecting struct net_device.type. However, for the tap variants, the
type is just ARPHRD_ETHER.

Therefore introduce two predicate functions that use netdev_ops to tell
the tap devices.

Signed-off-by: Petr Machata <petrm@mellanox.com>
Reviewed-by: Ido Schimmel <idosch@mellanox.com>
Signed-off-by: Jiri Pirko <jiri@mellanox.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
This commit is contained in:
Petr Machata
2018-02-27 14:53:37 +01:00
committed by David S. Miller
parent 8897207c89
commit d1b2a6c4be
3 changed files with 15 additions and 0 deletions
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6
net/ipv6/ip6_gre.c
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@@ -1785,6 +1785,12 @@ static void ip6gre_tap_setup(struct net_device *dev)
netif_keep_dst(dev);
}
bool is_ip6gretap_dev(const struct net_device *dev)
{
return dev->netdev_ops == &ip6gre_tap_netdev_ops;
}
EXPORT_SYMBOL_GPL(is_ip6gretap_dev);
static bool ip6gre_netlink_encap_parms(struct nlattr *data[],
struct ip_tunnel_encap *ipencap)
{