dccp: Integrate feature-negotiation insertion code
The patch implements insertion of feature negotiation at the server (listening and request socket) and the client (connecting socket). In dccp_insert_options(), several statements have been grouped together now to achieve (I hope) better efficiency by reducing the number of tests each packet has to go through: - Ack Vectors are sent if the packet is neither a Data or a Request packet; - a previous issue is corrected - feature negotiation options are allowed on DataAck packets (5.8). Signed-off-by: NGerrit Renker <gerrit@erg.abdn.ac.uk> Acked-by: NIan McDonald <ian.mcdonald@jandi.co.nz>
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