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udp: Complement partial checksum for GSO packet 

Using the udp_v4_check() function to calculate the pseudo header
for the newly segmented UDP packets results in assigning the complement
of the value to the UDP header checksum field.

Always undo the complement the partial checksum value in order to
match the case where GSO is not used on the UDP transmit path.

Fixes: ee80d1ebe5 ("udp: add udp gso")
Signed-off-by: Sean Tranchetti <stranche@codeaurora.org>
Signed-off-by: Subash Abhinov Kasiviswanathan <subashab@codeaurora.org>
Acked-by: Willem de Bruijn <willemb@google.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
This commit is contained in:
Sean Tranchetti 2018-04-30 18:01:02 -06:00 committed by David S. Miller
parent 702353b538
commit 6c035ba7e7
1 changed files with 1 additions and 0 deletions
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net/ipv4/udp_offload.c
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@ -223,6 +223,7 @@ struct sk_buff *__udp_gso_segment(struct sk_buff *gso_skb,
csum_replace2(&uh->check, htons(mss),
htons(seg->len - hdrlen - sizeof(*uh)));
uh->check = ~uh->check;
seg->destructor = sock_wfree;
seg->sk = sk;
sum_truesize += seg->truesize;