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-rw-r--r--net/mptcp/subflow.c17
1 files changed, 8 insertions, 9 deletions
diff --git a/net/mptcp/subflow.c b/net/mptcp/subflow.c
index bde6be77ea73..c6ee81149829 100644
--- a/net/mptcp/subflow.c
+++ b/net/mptcp/subflow.c
@@ -630,21 +630,20 @@ static struct sock *subflow_syn_recv_sock(const struct sock *sk,
/* if the sk is MP_CAPABLE, we try to fetch the client key */
if (subflow_req->mp_capable) {
- if (TCP_SKB_CB(skb)->seq != subflow_req->ssn_offset + 1) {
- /* here we can receive and accept an in-window,
- * out-of-order pkt, which will not carry the MP_CAPABLE
- * opt even on mptcp enabled paths
- */
- goto create_msk;
- }
-
+ /* we can receive and accept an in-window, out-of-order pkt,
+ * which may not carry the MP_CAPABLE opt even on mptcp enabled
+ * paths: always try to extract the peer key, and fallback
+ * for packets missing it.
+ * Even OoO DSS packets coming legitly after dropped or
+ * reordered MPC will cause fallback, but we don't have other
+ * options.
+ */
mptcp_get_options(skb, &mp_opt);
if (!mp_opt.mp_capable) {
fallback = true;
goto create_child;
}
-create_msk:
new_msk = mptcp_sk_clone(listener->conn, &mp_opt, req);
if (!new_msk)
fallback = true;