On 10/23/25 2:54 PM, Jiayuan Chen wrote: > When the server has MPTCP enabled but receives a non-MP-capable request > from a client, it calls mptcp_fallback_tcp_ops(). > > Since non-MPTCP connections are allowed to use sockmap, which replaces > sk->sk_prot, using sk->sk_prot to determine the IP version in > mptcp_fallback_tcp_ops() becomes unreliable. This can lead to assigning > incorrect ops to sk->sk_socket->ops.
I don't see how sockmap could modify the to-be-accepted socket sk_prot before mptcp_fallback_tcp_ops(), as such call happens before the fd is installed, and AFAICS sockmap can only fetch sockets via fds. Is this patch needed? /P
