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net: GRE: Add is_gretap_dev, is_ip6gretap_dev 

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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3
include/net/gre.h
View File

@ -37,6 +37,9 @@ struct net_device *gretap_fb_dev_create(struct net *net, const char *name,
int gre_parse_header(struct sk_buff *skb, struct tnl_ptk_info *tpi,
bool *csum_err, __be16 proto, int nhs);
bool is_gretap_dev(const struct net_device *dev);
bool is_ip6gretap_dev(const struct net_device *dev);
static inline int gre_calc_hlen(__be16 o_flags)
{
int addend = 4;

6
net/ipv4/ip_gre.c
View File

@ -1323,6 +1323,12 @@ static void ipgre_tap_setup(struct net_device *dev)
ip_tunnel_setup(dev, gre_tap_net_id);
}
bool is_gretap_dev(const struct net_device *dev)
{
return dev->netdev_ops == &gre_tap_netdev_ops;
}
EXPORT_SYMBOL_GPL(is_gretap_dev);
static int ipgre_newlink(struct net *src_net, struct net_device *dev,
struct nlattr *tb[], struct nlattr *data[],
struct netlink_ext_ack *extack)

6
net/ipv6/ip6_gre.c
View File

@ -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)
{