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README
This is a userspace path manager for the linux multipath TCP kernel, starting from version v0.95.
The software
The netlink module asks for GENL_ADMIN_PERM => The operation requires the CAP_NET_ADMIN privilege
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
Netlink explanation
To fetch TCP diagnostics: Creates a socket with family eNETLINK_INET_DIAG (really NETLINK_SOCK_DIAG) with value 4 AF_INET => netlink family 2
Compilation
With a custom netlink and kernel Compile the custom netlink library with
$ cabal configure --enable-library-profiling
kernel $ make headers_install
$ cabal configure --package-db /home/teto/netlink-hs/dist/package.conf.inplace --extra-include-dirs=/home/teto/mptcp2/build/usr/include -v3 --enable-profiling
To compile the doc (and understand why HIE fails displaying anything)
cabal haddock --all
Usage
Enter the nix-shell shell-test.nix and start the daemon:
$ cabal run daemon
or $ buildNRun To print a stacktrace cabal run daemon toto -- +RTS -xc
In a shell:
$ nix run nixpkgs.iperf -c iperf -s
In another:
$ nix run nixpkgs.iperf -c iperf -c localhost -b 1KiB -t 4 --cport 5500 -4 -C
cubic
Script to reload module
reload_mod() {
newMod="$1"
if [ -z "${newMod}" ]; then
echo "Use: <path to new module>"
echo "possibly /home/teto/mptcp2/build/net/mptcp/mptcp_netlink.ko"
fi
# 1. change to another scheduler
mppm "fullmesh"
sleep 1
# 2. rmmod the current one
sudo rmmod "mptcp_netlink"
# 3. Insert our new module
sleep 1
sudo insmod "$1"
# 4. restore path manager
mppm "netlink"
}
FAQ
error decoding InetDiagInfo
Testsuite
$ ss -t -4 -i
ss -o state established '( dport = :ssh or sport = :ssh )'
https://unix.stackexchange.com/questions/499190/where-is-the-official-documentation-debian-package-iproute-doc
sudo insmod ~/mptcp/build/net/ipv4/tcp_cubic.ko
BUGS
- conversion of SockDiagExtensionId is bad everywhere ? req.r.idiag_ext |= (1<<(INET_DIAG_INFO-1));
TODO
- 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)
- replace Enum2Bits wordToEnums function, especially to fix getSockDiagRequestHeader (with bitset package once it's fixed)
- 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
Note: ss package sends by default -- #define SS_ALL ((1 << SS_MAX) - 1) -- #define SS_CONN (SS_ALL & ~((1<<SS_LISTEN)|(1<<SS_CLOSE)|(1<<SS_TIME_WAIT)|(1<<SS_SYN_RECV))) -- #define TIPC_SS_CONN ((1<<SS_ESTABLISHED)|(1<<SS_LISTEN)|(1<<SS_CLOSE))