GSoC 2017 – Add MPTCP support in LEDE/OpenWRT trunk

Brief intro

My name is Ferenc Fejes. I’m MSc CE student at the University of Debrecen, infocommunication networks specialization. I glad to introduce my project which is Add MPTCP support in LEDE/OpenWRT. The main idea is from my mentor, Benjamin Henrion. If we have a Wi-Fi mesh network, there are probably more than one network path between the nodes. The point is, we can gain additional throughput if we use those path simultaneously.

The goal

Currently no MPTCP support in GNU/Linux nor Windows systems. So the key is, the user using regular TCP/UDP at his system until the first hop, which is a LEDE box with MPTCP support. At this point, this router operating as an intercepting proxy: read the incoming traffic from the host, and distribute that on multiple interface, using MPTCP. At receiver side, we can do the same but in reverse order: get the data from the MPTCP connection and send is to the sink host in regular TCP (or UDP). With this operation, the whole MPTCP transmission remains hidden for the end hosts, but they will enjoy the gain from it – because MPTCP has a good capability to aggregate the bandwitdh of the different paths. Of course, if the bottleneck between the end host and the first hop, the user did not get any gain from this operation.

The plan

The key steps for reach the goal of the project:
1. Set up virtual/real machines with MPTCP support. This is not a problem since kernel patches for MPTCP support available.
2. Make a simple multipath topology: end hosts with no MPTCP support, two machine with MPTCP support, functioning as a router and has two different network path between them
3. Search and configure an efficient and transparent proxy software on them, which can suitable for intercept TCP traffic and work as a tunnel for other protocols (like UDP, SCTP, etc.)
4. Reproduce the working configuration on LEDE supported devices, with two Wi-Fi bridge links between the LEDE boxes.
5. Verify the aggregation with iperf3 measurements.

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