rabbitwhite1 / vhost

A tool to provide virtual hosts, so that we can use the Barefoot Tofino model switch. This tool aims to make the hosts look like directly connected to Tofino model switch.

VHost

This project aims to provide virtual hosts for testing Barefoot Tofino Switches running on the Tofino Model.

Requirements

• packages:

sudo apt-get install mininet openssh-client openssh-server openvswitch-testcontroller
sudo ln /usr/bin/ovs-testcontroller /usr/bin/controller 
pip3 install mininet

VHost

Run vhost.py will create hosts according to config.json, whose format is as following:

{
    "hosts": {
        "h1": {
            "ip": "10.1.0.1",
            "mac": "aa:00:00:00:00:01",
            "sw_mac": "cc:00:00:00:00:01",
            "veth": "veth1"
        },
        "h2": {
            "ip": "10.1.0.2",
            "mac": "aa:00:00:00:00:02",
            "sw_mac": "cc:00:00:00:00:02",
            "veth": "veth3"
        }
    }
}

Each host is a dict, whose key is the host's name. Inside the dict:

• ip: is the IP address of this host
• mac: is the MAC address of this host
• sw_mac: is the MAC address used in this mininet switch (for now it can be any valid MAC address)
• veth: is the tofino model veth, to which the host's packets will be forward

With this configuration, vhost will do as following.

1. switch s1 will be created as a central switch connecting hosts and veth.
2. host h1 with ip and mac specified in config.json will be created
3. h1 will be connected to interface on s1 (call it s1-eth1, and its mac is sw_mac specified in config.json)
4. take h1 as an example. s1 sniffs on veth1 and s1-eth1.
   • when a packet is received from veth1, it will be forwarded to s1-eth1
   • when a packet is received from s1-eth1, it will be forwarded to veth1
   • if the dst of packet[Ether] is ff:ff:ff:ff:ff:ff, for now, I broadcast this packet.

---------------+                            +---------------------+
     Model     |                            |        vhost        |
     =====     |                            |        =====        |
               | veth0                veth1 |                     | s1-eth1         h1-eth0
       Port 0  +----------------------------+---------------------+------------------------+ h1
               |                            |                     |
               | veth2                veth3 |                     | s2-eth1         h2-eth0
       Port 1  +----------------------------+---------------------+------------------------+ h2
               |                            |                     |
               | veth4                veth5 |                     | s3-eth1         h3-eth0
       Port 2  +----------------------------+---------------------+------------------------+ h3
               |                            |                     |
            
     . . .                                          . . .

               | veth16              veth17 |                     | s8-eth1         h8-eth0
       Port 8  +----------------------------+---------------------+------------------------+ h8
               |                            |                     |
     . . .                                          . . .

               | veth250            veth251 |                     | ens33           
 Port 64 (CPU) +----------------------------+---------------------+------------------------+ controller
               |                            |                     |
---------------+                            +---------------------+

secdev/scapy#896

l2switch

Files in l2switch are to test the feasibility of my idea. I will later build the real virtual hosts for the target mentioned above.

r --size 2 --rank 0 --redis-host 10.0.1.1 --redis-port 6379 --prefix 377 --transport udp send_any r --size 2 --rank 1 --redis-host 10.0.1.1 --redis-port 6379 --prefix 377 --transport udp send_any