tcp: syncookies: create mptcp request socket for ACK cookies with MPTCP option
If SYN packet contains MP_CAPABLE option, keep it enabled. Syncokie validation and cookie-based socket creation is changed to instantiate an mptcp request sockets if the ACK contains an MPTCP connection request. Rather than extend both cookie_v4/6_check, add a common helper to create the (mp)tcp request socket. Suggested-by: Paolo Abeni <pabeni@redhat.com> Signed-off-by: Florian Westphal <fw@strlen.de> Signed-off-by: David S. Miller <davem@davemloft.net>
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