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L3MP

Multiplex up to 16 layer 3 tunnels through a single layer 3 tunnel

  • Uses the "diffserv" field in the IPv4/IPv6 header to label packets
  • Zero byte overhead (no MTU penalty)
  • Performant: Packets are never copied to userspace. (Uses an eBPF TC direct-action program that runs in the kernel eBPF sandbox)

Usage:

Requires root privileges or the CAP_NET_ADMIN linux capability

./l3mp <external interface> <path to file with interface-label definitions>
    The interface-label definitions file contains up to 16 entries in this format:
    <interface name>@<label>
    Where <label> is a number from 0 to 16

Building

Main program

Run go build -o L3MP .

Re-compile included eBPF program (Optional)

Requires llvm and clang to be installed. To start the compilation, run go generate .