[PATCH mptcp-next 1/6] mptcp: copy the subflow's rcv_tos to the msk on accept

From: Geliang Tang <[email protected]>

The server-side master socket never inherited the tos seen in the
peer's SYN. mptcp_sk_clone_init() now copies ssk->rcv_tos onto nsk
so inet->rcv_tos on the accepted msk reflects the peer's tos byte
(matching plain TCP).

Signed-off-by: Geliang Tang <[email protected]>
---
 net/mptcp/protocol.c | 2 ++
 1 file changed, 2 insertions(+)

diff --git a/net/mptcp/protocol.c b/net/mptcp/protocol.c
index 954e20bb27de..178cd8de990b 100644
--- a/net/mptcp/protocol.c
+++ b/net/mptcp/protocol.c
@@ -3699,6 +3699,8 @@ struct sock *mptcp_sk_clone_init(const struct sock *sk,
 #endif
 		mptcp_copy_ip_options(nsk, sk);
 
+	inet_sk(nsk)->rcv_tos = inet_sk(ssk)->rcv_tos;
+
 	msk = mptcp_sk(nsk);
 	WRITE_ONCE(msk->local_key, subflow_req->local_key);
 	WRITE_ONCE(msk->token, subflow_req->token);
-- 
2.53.0