Commit 6c035ba7 authored Apr 30, 2018 by Sean Tranchetti Committed by David S. Miller May 02, 2018

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: ee80d1eb ("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>

parent 702353b5

net/ipv4/udp_offload.c

+1 −0

Original line number	Diff line number	Diff line
		@@ -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;

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