Making the Linux TCP stack more extensible with eBPF

Thu, 04/18/2019 - 17:14 by Viet-Hoang Tran


We propose a novel way of extending the Linux TCP stack by leveraging
Lawrence Brakmo's TCP-BPF framework. We implement new eBPF callbacks to
support user-defined TCP options. We present 4 use cases: the TCP User
Timeout Option, which has been standardized in RFC 5482 but not yet
implemented in the Linux kernel. Since RFC 6994, TCP supports
experimental options. We use eBPF to implement a new experimental option
that enables a client to request a server to use a specific congestion
control scheme or set the initial congestion window. We also demonstrate
how eBPF code can be used to tune the acknowledgment strategy.

MPTCP is another interesting use case for eBPF with its scheduler and
path manager. We present an eBPF-based prototype MPTCP path-manager
framework and use it to implement the two existing ndiffports and
fullmesh path managers as eBPF programs.

Viet-Hoang Tran and Olivier Bonaventure
Netdev 0x13, 2019.
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