curo

curo = curonos - nos

curo is a software router

Functions

Platform

• PF_PACKET (Raw socket for linux)
• DPDK(Data Plane Development Kit)
• XDP (eXpress Data Path)

Network

• ARP Reply
• ARP Request
• Trie IP Routing Table
• IP Forwarding
• ICMP Echo Reply
• ICMP Time Exceeded
• ICMP Destination Unreachable
• NAT (UDP,TCP,ICMP(Query))
• NAT (ICMP(Error))

Build

sudo apt install build-essential
git clone https://github.com/kametan0730/curo.git
cd curo
make all

Example (for PF_PACKET)

0. Download sources and build

1. Create environment with network namespace

ip netns add host1
ip netns add router1
ip netns add router2
ip netns add host2

ip link add name host1-router1 type veth peer name router1-host1
ip link add name router1-router2 type veth peer name router2-router1
ip link add name router2-host2 type veth peer name host2-router2

ip link set host1-router1 netns host1
ip link set router1-host1 netns router1
ip link set router1-router2 netns router1
ip link set router2-router1 netns router2
ip link set router2-host2 netns router2
ip link set host2-router2 netns host2

ip netns exec host1 ip addr add 192.168.1.2/24 dev host1-router1
ip netns exec host1 ip link set host1-router1 up
ip netns exec host1 ethtool -K host1-router1 rx off tx off
ip netns exec host1 ip route add default via 192.168.1.1

ip netns exec router1 ip link set router1-host1 up
ip netns exec router1 ethtool -K router1-host1 rx off tx off
ip netns exec router1 ip link set router1-router2 up
ip netns exec router1 ethtool -K router1-router2 rx off tx off

ip netns exec router2 ip addr add 192.168.0.2/24 dev router2-router1
ip netns exec router2 ip link set router2-router1 up
ip netns exec router2 ethtool -K router2-router1 rx off tx off
ip netns exec router2 ip route add default via 192.168.0.1
ip netns exec router2 ip addr add 192.168.2.1/24 dev router2-host2
ip netns exec router2 ip link set router2-host2 up
ip netns exec router2 ethtool -K router2-host2 rx off tx off
ip netns exec router2 sysctl -w net.ipv4.ip_forward=1

ip netns exec host2 ip addr add 192.168.2.2/24 dev host2-router2
ip netns exec host2 ip link set host2-router2 up
ip netns exec host2 ethtool -K host2-router2 rx off tx off
ip netns exec host2 ip route add default via 192.168.2.1

2. Config

Open pf_packet/main.cpp and change configure function as follows

void configure(){
    configure_ip_address(get_net_device_by_name("router1-host1"), IP_ADDRESS(192, 168, 1, 1), IP_ADDRESS(255, 255, 255, 0));
    configure_ip_address(get_net_device_by_name("router1-router2"), IP_ADDRESS(192, 168, 0, 1), IP_ADDRESS(255, 255, 255, 0));
    configure_ip_net_route(IP_ADDRESS(192, 168, 2, 0), 24, IP_ADDRESS(192, 168, 0, 2));
}

3. Execute

3.1 Join router1 namespace

sudo ip netns exec router1 bash

3.2 Move the directory to where curo is located

3.3 Execute

make run

4. Enjoy!

Ready two terminals

sudo ip netns exec host1 iperf3 -s

sudo ip netns exec host2 iperf3 -c 192.168.1.2