This is a userspace path manager for the linux multipath TCP kernel, starting from version v0.95.
This allows to monitor MPTCP connections and control what subflows to create and with a custom kernel it can even set specific values for the congestion windows.
For now we need a custom version of netlink With a custom netlink and kernel Compile the custom netlink library with
$ cabal configure --enable-library-profiling
You may need some headers as well (NOTE: reference cabal.project instead):
kernel $ make headers_install
$ cabal configure --package-db ~/netlink-hs/dist/package.conf.inplace --extra-include-dirs=~/mptcp/build/usr/include -v3 --enable-profiling
To compile the doc (and understand why HLS fails displaying anything)
cabal haddock --all
The netlink module asks for GENL_ADMIN_PERM which requires the CAP_NET_ADMIN privilege.
You can assign this privilege via:
sudo setcap cap_net_admin+ep hs/dist-newstyle/build/x86_64-linux/ghc-8.6.3/netlink-pm-1.0.0/x/daemon/build/daemon/daemon
Enter the development shell and start the daemon:
$ nix develop
$ cabal run mptcp-manager
- remove the need for MptcpSocket everywhere: it's just needed to write the header, which could be added/modifier later instead ! (to increase purity in the library)
- we need to better keep track of subflow status (established vs WIP) ?
- pass local/server IPs as commands to the PM ?
- generate completion scripts via --zsh-completion-script
This work is sponsored by NGI.