iflink is currently set to 0 in __gre_tunnel_init(). This
function is invoked in gre_tap_init() and
ipgre_tunnel_init() which are both used to initialise the
ndo_init field of the respective net_device_ops structs
(ipgre.. and gre_tap..) used by GRE interfaces.
However, in netdevice_register() iflink is first set to -1,
then ndo_init is invoked and then iflink is assigned to a
proper value if and only if it still was -1.
Assigning 0 to iflink in ndo_init is therefore first
preventing netdev_register() to correctly assign it a proper
value and then breaking iflink at all since 0 has not
correct meaning.
Fix this by removing the iflink assignment in
__gre_tunnel_init().
Introduced by c54419321455631079c7d6e60bc732dd0c5914c5
("GRE: Refactor GRE tunneling code.")
Reported-by: Fengguang Wu <[email protected]>
Cc: Pravin B Shelar <[email protected]>
Cc: "David S. Miller" <[email protected]>
Signed-off-by: Antonio Quartulli <[email protected]>
---
net/ipv4/ip_gre.c | 1 -
1 file changed, 1 deletion(-)
diff --git a/net/ipv4/ip_gre.c b/net/ipv4/ip_gre.c
index ad662e9..e5dfd28 100644
--- a/net/ipv4/ip_gre.c
+++ b/net/ipv4/ip_gre.c
@@ -660,7 +660,6 @@ static void __gre_tunnel_init(struct net_device *dev)
dev->needed_headroom = LL_MAX_HEADER + sizeof(struct iphdr) + 4;
dev->mtu = ETH_DATA_LEN - sizeof(struct iphdr) - 4;
- dev->iflink = 0;
dev->features |= NETIF_F_NETNS_LOCAL | GRE_FEATURES;
dev->hw_features |= GRE_FEATURES;
--
1.8.1.5
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