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HowToRunNetworkStackOnQemu.md

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How to run network stack on QEMU

This document explains steps to be followed to run network stack on QEMU.

Steps to verify network stack on QEMU is as follows

Prerequisites: Connect WiFi AP to Linux machine(wired connection. dhcp should be enabled in the AP).

TizenRT QEMU image build procedure on Host

  1. cd os/tools
  2. ./configure.sh qemu/tc_16m
  3. cd ..
  4. make

Bringup tap interface on Host

Create bridge and tap interface by adding below commands into shell script file(net_up.sh).
script to bring up the tap interface on QEMU in bridged mode first parameter is name of tap device (e.g. tap0).

#!/bin/sh
ETH0IPADDR=192.168.1.20
MASK=255.255.255.0
GATEWAY=192.168.1.1
BROADCAST=192.168.1.255

#First take enp3s0 down, then bring it up with IP address 0.0.0.0
/sbin/ifdown enp3s0
/sbin/ifconfig enp3s0 0.0.0.0 promisc up

#Bring up the tap device (name specified as first argument, by QEMU)
/usr/sbin/openvpn --mktun --dev $1 --user `id -un`
/sbin/ifconfig $1 0.0.0.0 promisc up

#create the bridge between enp3s0 and the tap device
/sbin/brctl addbr br0
/sbin/brctl addif br0 enp3s0
/sbin/brctl addif br0 $1

#only a single bridge so loops are not possible, turn off spanning tree protocol
/sbin/brctl stp br0 off
/sbin/ifconfig br0 $ETH0IPADDR netmask $MASK broadcast $BROADCAST
/sbin/route add default gw $GATEWAY

#stop firewall - comment this out if you don't use Firestarter
/sbin/service firestarter stop

save and execute the shell script with tap0 as argument(ex: sudo ./net_up.sh tap0).

Run Qemu with netwrok interface as below

$sudo qemu-system-arm -M lm3s6965evb -kernel ../build/output/bin/tinyara.bin -nographic -net nic -net tap,ifname=tap0,script=no

Bringup Interface on QEMU

#bringup interface
$ifup en1

#Get IP from AP
$ifconfig en1 dhcp

Now Ping to Host IP(192.xxx.xx.xxx) and ping from Host to Qemu(192.xxx.xx.xxx).

Bring down interface

To bring down tap0 and bridge interfaces add the below commands into shell script(net_down.sh) and execute shell script.

#!/bin/sh

#Bring down enp3s0 and br0
/sbin/ifdown enp3s0
/sbin/ifdown br0
/sbin/ifconfig br0 down

#Delete the bridge
/sbin/brctl delbr br0

#bring up enp3s0 in "normal" mode
/sbin/ifconfig enp3s0 -promisc
/sbin/ifup enp3s0

#delete the tap device
/usr/sbin/openvpn --rmtun --dev $1

#start firewall again
/sbin/service firestarter start

Save and execute the shell script with tap0 as argument(ex: sudo ./net_down.sh tap0).