tinyvswitch

A virtual switch implementation, works on anything with a net_device.

Tested on 5.15.0-118-generic

Features

• Unicast/broadcast packet forwarding
• MAC learning
• Packet flooding

Usage

Clone and build the source, load the kernel module.

make
sudo insmod vswitch.ko

Create a client/VM. In this case I'm creating a veth pair with a namespace on one end to mimic a VM (see scripts/create_vm).

sudo ./scripts/create-vm vm1 00:11:11:11:11:11 192.168.1.1/24
VM network setup complete for vm1

The module is exposed to userspace via sysfs. To add and remove an interface:

echo "vm1-eth0-end" | sudo tee /sys/kernel/vswitch/add_interface
echo "vm1-eth0-end" | sudo tee /sys/kernel/vswitch/remove_interface

A basic test suite can be found in tests/.

Why?

Just for fun

Features to add

• VLAN tagging
• Port mirroring
• Multicast support (IGMP snooping)