From 648ef4b88673dadb8463bf0d4b10fbf33d55def8 Mon Sep 17 00:00:00 2001 From: Mat Martineau Date: Tue, 21 Jan 2020 16:56:24 -0800 Subject: mptcp: Implement MPTCP receive path Parses incoming DSS options and populates outgoing MPTCP ACK fields. MPTCP fields are parsed from the TCP option header and placed in an skb extension, allowing the upper MPTCP layer to access MPTCP options after the skb has gone through the TCP stack. The subflow implements its own data_ready() ops, which ensures that the pending data is in sequence - according to MPTCP seq number - dropping out-of-seq skbs. The DATA_READY bit flag is set if this is the case. This allows the MPTCP socket layer to determine if more data is available without having to consult the individual subflows. It additionally validates the current mapping and propagates EoF events to the connection socket. Co-developed-by: Paolo Abeni Signed-off-by: Paolo Abeni Co-developed-by: Peter Krystad Signed-off-by: Peter Krystad Co-developed-by: Davide Caratti Signed-off-by: Davide Caratti Co-developed-by: Matthieu Baerts Signed-off-by: Matthieu Baerts Co-developed-by: Florian Westphal Signed-off-by: Florian Westphal Signed-off-by: Mat Martineau Signed-off-by: Christoph Paasch Signed-off-by: David S. Miller --- include/linux/tcp.h | 10 ++++++++++ 1 file changed, 10 insertions(+) (limited to 'include/linux') diff --git a/include/linux/tcp.h b/include/linux/tcp.h index e9ee06d887fa..0d00dad4b85d 100644 --- a/include/linux/tcp.h +++ b/include/linux/tcp.h @@ -82,9 +82,19 @@ struct tcp_sack_block { struct mptcp_options_received { u64 sndr_key; u64 rcvr_key; + u64 data_ack; + u64 data_seq; + u32 subflow_seq; + u16 data_len; u8 mp_capable : 1, mp_join : 1, dss : 1; + u8 use_map:1, + dsn64:1, + data_fin:1, + use_ack:1, + ack64:1, + __unused:3; }; #endif -- cgit v1.2.3