summaryrefslogtreecommitdiff
path: root/net/ipv4/ip_tunnel.c
diff options
context:
space:
mode:
Diffstat (limited to 'net/ipv4/ip_tunnel.c')
-rw-r--r--net/ipv4/ip_tunnel.c6
1 files changed, 5 insertions, 1 deletions
diff --git a/net/ipv4/ip_tunnel.c b/net/ipv4/ip_tunnel.c
index 5719d6ba0824..12a92e3349ed 100644
--- a/net/ipv4/ip_tunnel.c
+++ b/net/ipv4/ip_tunnel.c
@@ -358,6 +358,7 @@ static struct ip_tunnel *ip_tunnel_create(struct net *net,
{
struct ip_tunnel *nt;
struct net_device *dev;
+ int t_hlen;
BUG_ON(!itn->fb_tunnel_dev);
dev = __ip_tunnel_create(net, itn->fb_tunnel_dev->rtnl_link_ops, parms);
@@ -367,6 +368,9 @@ static struct ip_tunnel *ip_tunnel_create(struct net *net,
dev->mtu = ip_tunnel_bind_dev(dev);
nt = netdev_priv(dev);
+ t_hlen = nt->hlen + sizeof(struct iphdr);
+ dev->min_mtu = ETH_MIN_MTU;
+ dev->max_mtu = 0xFFF8 - dev->hard_header_len - t_hlen;
ip_tunnel_add(itn, nt);
return nt;
}
@@ -929,7 +933,7 @@ int __ip_tunnel_change_mtu(struct net_device *dev, int new_mtu, bool strict)
int t_hlen = tunnel->hlen + sizeof(struct iphdr);
int max_mtu = 0xFFF8 - dev->hard_header_len - t_hlen;
- if (new_mtu < 68)
+ if (new_mtu < ETH_MIN_MTU)
return -EINVAL;
if (new_mtu > max_mtu) {