mptcp: add TCP_INQ cmsg support
Support the TCP_INQ setsockopt. This is a boolean that tells recvmsg path to include the remaining in-sequence bytes in the cmsg data. v2: do not use CB(skb)->offset, increment map_seq instead (Paolo Abeni) v3: adjust CB(skb)->map_seq when taking skb from ofo queue (Paolo Abeni) Closes: https://github.com/multipath-tcp/mptcp_net-next/issues/224 Signed-off-by: Florian Westphal <fw@strlen.de> Signed-off-by: Mat Martineau <mathew.j.martineau@linux.intel.com> Signed-off-by: Jakub Kicinski <kuba@kernel.org>
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