Commit 582442d6 authored by Oussama Ghorbel's avatar Oussama Ghorbel Committed by David S. Miller
Browse files

ipv6: Allow the MTU of ipip6 tunnel to be set below 1280

The (inner) MTU of a ipip6 (IPv4-in-IPv6) tunnel cannot be set below 1280, which is the minimum MTU in IPv6.
However, there should be no IPv6 on the tunnel interface at all, so the IPv6 rules should not apply.
More info at

This patch allows to check the minimum MTU for ipv6 tunnel according to these rules:
-In case the tunnel is configured with ipip6 mode the minimum MTU is 68.
-In case the tunnel is configured with ip6ip6 or any mode the minimum MTU is 1280.

Signed-off-by: default avatarOussama Ghorbel <>
Acked-by: default avatarHannes Frederic Sowa <>
Signed-off-by: default avatarDavid S. Miller <>
parent 3573540c
......@@ -1430,9 +1430,17 @@ ip6_tnl_ioctl(struct net_device *dev, struct ifreq *ifr, int cmd)
static int
ip6_tnl_change_mtu(struct net_device *dev, int new_mtu)
if (new_mtu < IPV6_MIN_MTU) {
return -EINVAL;
struct ip6_tnl *tnl = netdev_priv(dev);
if (tnl->parms.proto == IPPROTO_IPIP) {
if (new_mtu < 68)
return -EINVAL;
} else {
if (new_mtu < IPV6_MIN_MTU)
return -EINVAL;
if (new_mtu > 0xFFF8 - dev->hard_header_len)
return -EINVAL;
dev->mtu = new_mtu;
return 0;
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