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Commit a9e242ca authored by Alexander Duyck's avatar Alexander Duyck Committed by David S. Miller
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ip6gretap: Fix MTU to allow for Ethernet header 



When we were creating an ip6gretap interface the MTU was about 6 bytes
short of what was needed.  It turns out we were not taking the Ethernet
header into account and as a result we were eating into the 8 bytes
reserved for the encap limit.

Signed-off-by: default avatarAlexander Duyck <aduyck@mirantis.com>
Signed-off-by: default avatarDavid S. Miller <davem@davemloft.net>
parent aed069df

net/ipv6/ip6_gre.c

+2 −0
Original line number Diff line number Diff line
@@ -987,6 +987,8 @@ static void ip6gre_tnl_link_config(struct ip6_tnl *t, int set_mtu) 
				dev->mtu = rt->dst.dev->mtu - addend;

				if (!(t->parms.flags & IP6_TNL_F_IGN_ENCAP_LIMIT))

					dev->mtu -= 8;

				if (dev->type == ARPHRD_ETHER)

					dev->mtu -= ETH_HLEN;



				if (dev->mtu < IPV6_MIN_MTU)

					dev->mtu = IPV6_MIN_MTU;