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UPSTREAM: udp: properly flush normal packet at GRO time

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If an UDP packet enters the GRO engine but is not eligible
for aggregation and is not targeting an UDP tunnel,
udp_gro_receive() will not set the flush bit, and packet
could delayed till the next napi flush.

Fix the issue ensuring non GROed packets traverse
skb_gro_flush_final().

Reported-and-tested-by: Matthias Treydte <mt@waldheinz.de>
Fixes: 18f25dc39990 ("udp: skip L4 aggregation for UDP tunnel packets")
Signed-off-by: Paolo Abeni <pabeni@redhat.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
(cherry picked from commit b43c8909be52f2baca8884f967b418a88424494a)
Bug: 187129171
Signed-off-by: Connor O'Brien <connoro@google.com>
Change-Id: Ic240b52b00c04621d0f523c1540e6d4b587ad1cd
This commit is contained in:
Paolo Abeni 2021-07-03 00:38:43 +02:00 • committed by Connor O'Brien
commit 2e30052a73
1 changed files with 4 additions and 2 deletions
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6
net/ipv4/udp_offload.c
View file

@ -521,8 +521,10 @@ struct sk_buff *udp_gro_receive(struct list_head *head, struct sk_buff *skb,
NAPI_GRO_CB(skb)->is_flist = sk ? !udp_sk(sk)->gro_enabled : 1;
if ((sk && udp_sk(sk)->gro_enabled) || NAPI_GRO_CB(skb)->is_flist)
pp = call_gro_receive(udp_gro_receive_segment, head, skb);
return pp;
return call_gro_receive(udp_gro_receive_segment, head, skb);
/* no GRO, be sure flush the current packet */
goto out;
}
if (NAPI_GRO_CB(skb)->encap_mark ||