+--------------------+
| |
| Host PC |
+--------------------+
| tap0 | tap1 | |
+--+------+----------+
| |
| |
+--+------+---+------+
wan | eth0 | eth1 | |
+-------------+------+
+-------------+ | Qemu emulate router
lan | eth2 | eth3 | |
+---+------+--+------+
| |
| |
+-----------+ | +--+---------+
| client 1 |--+ | client 2 | Qemu emulate PCs
| | | |
+-----------+ +------------+
qemu-router 之环境设计
最近想用qemu在linux下 build 一个环境，来模拟开发路由器。好处有很多，比如便于调试kernel阿，乱搞不会破坏系统阿之类的。
于是写了两个script，一个负责模拟router端，一个负责模拟客户机。整个环境配置如图:
router模拟了2个wan口，2个lan口，wan口通过tap跟host(主机)联系，host端启动的script为/etc/qemu-ifup
#!/bin/sh
inf=$1
ip3=${inf##tap}
sudo /sbin/ifconfig $1 172.20.${ip3}.1
inf=$1
ip3=${inf##tap}
sudo /sbin/ifconfig $1 172.20.${ip3}.1
这样就保证了host端的tap interface根据tap0, tap1 ...来配置ip，使得tap0为172.20.0.1, tap1为172.20.1.1，从而配合router模拟出multi wan的环境。
然后是router的启动脚本q-router.sh
#!/bin/bash
port_base=8010
((port1 = port_base + 1))
((port2 = port_base + 2))
QEMU_PATH=/home/fog/study/kernel/emulate/qemu-0.9.1
export PATH=${QEMU_PATH}:/bin:/sbin:/usr/bin:/usr/local/bin:/usr/local/sbin
IMAGE=linux-2.6.16/arch/i386/boot/bzImage
FS=fs-router.squashfs
QEMU=qemu
sudo ${QEMU} -nographic \
-net nic -net tap \
-net nic -net tap \
-net nic,vlan=1 -net socket,vlan=1,listen=:${port1} \
-net nic,vlan=2 -net socket,vlan=2,listen=:${port2} \
-hda ${FS} -hdb ${FS} -kernel ${IMAGE} \
-append "console=ttyS0 root=/dev/hdb rw sb=0x220,5,1,5 ide3=noprobe ide4=noprobe ide5=noprobe clock=pit" -s -S
port_base=8010
((port1 = port_base + 1))
((port2 = port_base + 2))
QEMU_PATH=/home/fog/study/kernel/emulate/qemu-0.9.1
export PATH=${QEMU_PATH}:/bin:/sbin:/usr/bin:/usr/local/bin:/usr/local/sbin
IMAGE=linux-2.6.16/arch/i386/boot/bzImage
FS=fs-router.squashfs
QEMU=qemu
sudo ${QEMU} -nographic \
-net nic -net tap \
-net nic -net tap \
-net nic,vlan=1 -net socket,vlan=1,listen=:${port1} \
-net nic,vlan=2 -net socket,vlan=2,listen=:${port2} \
-hda ${FS} -hdb ${FS} -kernel ${IMAGE} \
-append "console=ttyS0 root=/dev/hdb rw sb=0x220,5,1,5 ide3=noprobe ide4=noprobe ide5=noprobe clock=pit" -s -S
'-s -S' 是为了gdb调试用的。eth0, eth1, eth2, eth3的ip设定都在root fs中的etc/rcS中实现。
client端pc的模拟就更简单了，为了方便，我直接把ip通过kernel的参数做了指定。q-client.sh
#!/bin/bash
port_base=8010
ip3_base=9
cn=$1 # client number
: ${cn:="1"}
((port = port_base + cn))
((ip3 = ip3_base + cn))
QEMU_PATH=/home/fog/study/kernel/emulate/qemu-0.9.1
export PATH=${QEMU_PATH}:/bin:/sbin:/usr/bin:/usr/local/bin:/usr/local/sbin
IMAGE=linux-2.6.16/arch/i386/boot/bzImage
FS=fs-client.squashfs
QEMU=qemu
sudo ${QEMU} -nographic \
-net nic,vlan=1 -net socket,vlan=1,connect=127.0.0.1:${port} \
-hda ${FS} -hdb ${FS} -kernel ${IMAGE} \
-append \
"console=ttyS0 root=/dev/hdb rw \
ip=192.168.${ip3}.2::192.168.${ip3}.1:255.255.255.0::eth0:off \
sb=0x220,5,1,5 ide3=noprobe ide4=noprobe ide5=noprobe clock=pit"
port_base=8010
ip3_base=9
cn=$1 # client number
: ${cn:="1"}
((port = port_base + cn))
((ip3 = ip3_base + cn))
QEMU_PATH=/home/fog/study/kernel/emulate/qemu-0.9.1
export PATH=${QEMU_PATH}:/bin:/sbin:/usr/bin:/usr/local/bin:/usr/local/sbin
IMAGE=linux-2.6.16/arch/i386/boot/bzImage
FS=fs-client.squashfs
QEMU=qemu
sudo ${QEMU} -nographic \
-net nic,vlan=1 -net socket,vlan=1,connect=127.0.0.1:${port} \
-hda ${FS} -hdb ${FS} -kernel ${IMAGE} \
-append \
"console=ttyS0 root=/dev/hdb rw \
ip=192.168.${ip3}.2::192.168.${ip3}.1:255.255.255.0::eth0:off \
sb=0x220,5,1,5 ide3=noprobe ide4=noprobe ide5=noprobe clock=pit"
这样，先启动router，然后启动client,一个简单的模拟环境就架起来了。
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