From 64d950ae0b01eae96eb668b789c6d145c38ac41c Mon Sep 17 00:00:00 2001
From: Christoph Paasch <cpaasch@apple.com>
Date: Mon, 11 May 2020 09:24:42 -0700
Subject: [PATCH] mptcp: Initialize map_seq upon subflow establishment
When the other MPTCP-peer uses 32-bit data-sequence numbers, we rely on
map_seq to indicate how to expand to a 64-bit data-sequence number in
expand_seq() when receiving data.
For new subflows, this field is not initialized, thus results in an
"invalid" mapping being discarded.
Fix this by initializing map_seq upon subflow establishment time.
Fixes: f296234c98a8 ("mptcp: Add handling of incoming MP_JOIN requests")
Signed-off-by: Christoph Paasch <cpaasch@apple.com>
Reviewed-by: Paolo Abeni <pabeni@redhat.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
---
net/mptcp/protocol.c | 2 ++
1 file changed, 2 insertions(+)
diff --git a/net/mptcp/protocol.c b/net/mptcp/protocol.c
index e1f23016ed3f81..32ea8d35489a51 100644
--- a/net/mptcp/protocol.c
+++ b/net/mptcp/protocol.c
@@ -1629,6 +1629,8 @@ bool mptcp_finish_join(struct sock *sk)
ret = mptcp_pm_allow_new_subflow(msk);
if (ret) {
+ subflow->map_seq = msk->ack_seq;
+
/* active connections are already on conn_list */
spin_lock_bh(&msk->join_list_lock);
if (!WARN_ON_ONCE(!list_empty(&subflow->node)))
--
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