Set up Raspberrypi3 with MPTCP

Set up Raspberrypi3 with MPTCP

References:
[1] https://www.raspberrypi.org/documentation/linux/kernel/building.md
[2] https://www.raspberrypi.org/downloads/raspbian/
[3] https://www.raspberrypi.org/documentation/linux/kernel/patching.md
[4] https://wiki.ubuntuusers.de/Kernel/Kompilierung/#Konfigurations-Werkzeuge
[5] https://multipath-tcp.org/pmwiki.php/Users/DoItYourself
[6] https://github.com/multipath-tcp/iproute-mptcp.git
[7] https://multipath-tcp.org/pmwiki.php/Users/Tools
[8] http://mytechpg.blogspot.de/2016/07/mptcp-raspberrry-pi-and-yocto.html
[9] https://github.com/mytechpg/meta-mytechpg.git


I AM NOT RESPONSIBLE FOR ANY DEMAGES TO YOUR DEVICES. FOLLOW THESE INSTRUCTIONS ON YOUR OWN RISC

Compiling mptcp into a default raspbian kernel on a Raspberrypi3

dd the downloaded Raspian from:
https://www.raspberrypi.org/downloads/raspbian/
The Lite version is enough

(Advised by [1], dunno if its rly needed)
sudo apt-get install bc

Get the MPTCP patch from Andrea: (Credits: http://mytechpg.blogspot.de/2016/07/mptcp-raspberrry-pi-and-yocto.html)
git clone https://github.com/mytechpg/meta-mytechpg.git

(The file we want is https://github.com/mytechpg/meta-mytechpg/blob/master/recipes-kernel/linux/files/6001_mptcp_4.1.21.patch if u dont want to clone the whole repo)
(yes you also can compile with yocto, but its bit complicated to get apt, iproutepatch, etc. working)

Get Kernel Sources and patch:

git clone https://github.com/raspberrypi/linux
cd linux
git checkout rpi-4.1.y
KERNEL=kernel7
cat $PATCHFILE | patch -p1
make bcm2709_defconfig

We have now a default config for our Kernel without any enabled MPTCP
For configuration i prefer make nconfig (sudo apt-get install libncurses5-dev) [4]

Next step is enable MPTCP in the kernel config:
make nconfig

Follow the steps mentioned in https://multipath-tcp.org/pmwiki.php/Users/DoItYourself
CARE: You have to enable IPV6, module is NOT enough!!! If you dont change it, the MPTCP entry wont show up and is hidden!
("You cannot set IPv6 as a module. Either compile it into the kernel, or disable it"[5])

after saving with f9:

make -j4 zImage modules dtbs
sudo make modules_install
sudo cp arch/arm/boot/dts/*.dtb /boot/
sudo cp arch/arm/boot/dts/overlays/*.dtb* /boot/overlays/
sudo cp arch/arm/boot/dts/overlays/README /boot/overlays/
sudo scripts/mkknlimg arch/arm/boot/zImage /boot/$KERNEL.img
[1]

reboot and u are finished :)
check it with e.g.: sysctl net.mptcp.mptcp_enabled

To control MPTCP we could need some useful tools:
git clone https://github.com/multipath-tcp/iproute-mptcp.git
cd iproute-mptcp

To build this we need some packages:
sudo apt-get install bison flex libdb-dev

Now we can build:

make

Here are some examles how to use them:
https://multipath-tcp.org/pmwiki.php/Users/Tools