xfrm: Fix ESN sequence number handling for IPsec GSO packets.

When IPsec offloading was introduced, we accidentally incremented
the sequence number counter on the xfrm_state by one packet
too much in the ESN case. This leads to a sequence number gap of
one packet after each GSO packet. Fix this by setting the sequence
number to the correct value.

Fixes: d7dbefc45cf5 ("xfrm: Add xfrm_replay_overflow functions for offloading")
Signed-off-by: Steffen Klassert <steffen.klassert@secunet.com>

diff --git a/net/xfrm/xfrm_replay.c b/net/xfrm/xfrm_replay.c
index 1d38c6acf8afbbab13a1ad1d05b4f67d6816d38b..9e3a5e85f8285e67323e6069f642fc8610ecd44b 100644 (file)
--- a/net/xfrm/xfrm_replay.c
+++ b/net/xfrm/xfrm_replay.c
@@ -660,7 +660,7 @@ static int xfrm_replay_overflow_offload_esn(struct xfrm_state *x, struct sk_buff
                } else {
                        XFRM_SKB_CB(skb)->seq.output.low = oseq + 1;
                        XFRM_SKB_CB(skb)->seq.output.hi = oseq_hi;
-                       xo->seq.low = oseq = oseq + 1;
+                       xo->seq.low = oseq + 1;
                        xo->seq.hi = oseq_hi;
                        oseq += skb_shinfo(skb)->gso_segs;
                }