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ipv6: Paritially checksum full MTU frames 

IPv6 will mark data that is smaller that mtu - headersize as
CHECKSUM_PARTIAL, but if the data will completely fill the mtu,
the packet checksum will be computed in software instead.
Extend the conditional to include the data that fills the mtu
as well.

Signed-off-by: Vladislav Yasevich <vyasevic@redhat.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
This commit is contained in:
Vlad Yasevich 2017-01-29 22:52:53 -05:00 committed by David S. Miller
parent d585df1c5c
commit 2b89ed65a6
1 changed files with 1 additions and 1 deletions
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2
net/ipv6/ip6_output.c
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@ -1344,7 +1344,7 @@ static int __ip6_append_data(struct sock *sk,
*/
if (transhdrlen && sk->sk_protocol == IPPROTO_UDP &&
headersize == sizeof(struct ipv6hdr) &&
length < mtu - headersize &&
length <= mtu - headersize &&
!(flags & MSG_MORE) &&
rt->dst.dev->features & (NETIF_F_IPV6_CSUM | NETIF_F_HW_CSUM))
csummode = CHECKSUM_PARTIAL;