mptcp: keep track of advertised windows right edge
Before sending 'x' new bytes also check that the new snd_una would be within the permitted receive window. For every ACK that also contains a DSS ack, check whether its tcp-level receive window would advance the current mptcp window right edge and update it if so. Signed-off-by: Florian Westphal <fw@strlen.de> Co-developed-by: Paolo Abeni <pabeni@redhat.com> Signed-off-by: Paolo Abeni <pabeni@redhat.com> Signed-off-by: Jakub Kicinski <kuba@kernel.org>
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