2015.10.05 updated > network device development - part 1: switch
TRANSCRIPT
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Network Device Development
PART 1 – Switch
SEAN
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Sean
• Developer
• https://www.facebook.com/erinus
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GitHub
https://github.com/erinus/NetworkDeviceDevelopment
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Choose your Board
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Simple, Support, Easy, …
X86 Board
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X86 Board with 6 Ethernet
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Specification
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Specification
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LAN-1037-6L
http://tw.taobao.com/item/42824613011.htm
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Choose your Operating System
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Simple, Clean, Easy, …
Debian
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Debian 6.0.10
http://cdimage.debian.org/mirror/cdimage/archive/6.0.10/i386/iso-cd/debian-6.0.10-i386-
businesscard.iso
Debian 7.9.0
http://cdimage.debian.org/mirror/cdimage/archive/7.9.0/i386/iso-cd/debian-7.9.0-i386-netinst.iso
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Choose your Virtual Machine
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Simple, Stable, Fast, …
VMware Workstation
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Setup your Board
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X86 Board with 6 Ethernet
eth5 eth4 eth3 eth2 eth1 eth0
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X86 Board with 6 Ethernet
Internet
mSATA mSATA
RAM
USBDVD-ROM
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Setup your Virtual Machine
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Simple, Stable, Fast, …
VMware Workstation
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Virtual Network Editor
Add Network: VMnet2, VMnet3, …, VMnet8
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Virtual Network Editor
Modify IP number (192.168.10X.0) to match VMnetX for debugging
Modify this
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Virtual Network Editor
Uncheck "Connect a host virtual adapter to this network" to make isolated subnet
Uncheck this
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New Virtual Machine
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Install Operating System Later
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Choose Guest Operating System
Linux + Debian 6
Linux + Debian 7
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Name and Location
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Disk Capacity
32+ GB
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Customize Hardware Profile
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Add 6 Virtual Network Adapter
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Done
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Install your Operating System
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Splash Screen
Install
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Uncheck them to keepsmallest installation
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Setup your Operating System
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Reboot
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Login by root
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Remove account
$ deluser --remove-home user
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Update and Upgrade
$ apt-get update
$ apt-get –y upgrade
$ apt-get –y dist-upgrade
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Install Packages
$ apt-get install –y vim gcc g++ ssh make cmakeopenssh-server openssh-client binutils build-
essential git python python-dev python-pip zip unzip bzip2 bridge-utils
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Check Kernel Version
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Search Kernel Development Packages
Debian 6.0.10
VMware use linux-headers-2.6.32-5-686
Debian 7.8.0
VMware use linux-headers-3.2.0-4-686-pae
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Search Kernel Development Packages
Debian 6.0.10
VMware use linux-headers-2.6.32-5-686
Debian 7.9.0
VMware use linux-headers-3.2.0-4-686-pae
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Install Kernel Development Packages
Debian 6.0.10
$ apt-get install –y linux-headers-2.6.32-5-commonlinux-headers-2.6.32-5-686
Debian 7.9.0
$ apt-get install –y linux-headers-3.2.0-4-commonlinux-headers-3.2.0-4-686-pae
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Final
# release 100+ MB
$ apt-get autoremove
$ apt-get autoclean
$ rm /var/cache/apt/archives/*.deb
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Before Development
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Development More Easily
Use SSH Client, SFTP Client, and Smart Text Editor
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Recommended
Xshell
Xftp
Sublime Text
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First Kernel Module
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Always
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Hello World
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Create Makefile
Return kernel version
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Create main.c
Include Header File
Init$ insmod *.ko
Exit$ rmmod *.ko
Register Module
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Clear Kernel Message Buffer
$ dmesg -c
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Build
$ make
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Install
$ make install
$ dmesg
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Remove
$ make remove
$ dmesg
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About Netfilter
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PREROUTING POSTROUTING
IN
dest is localhost
?FORWARD
LOCALHOSTINPUT OUTPUT
OUT
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About Network Topology
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VMnet2
192.168.102.?
VMnet3
192.168.103.?
CLIENTUbuntu Desktop192.168.102.128
CLIENTUbuntu Desktop192.168.103.128
SWITCHDebian
VMnet1
NAT
eth1 eth2
eth0
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About Bridge-Utils
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Set Promisc Mode
$ ifconfig eth1 0.0.0.0 promisc up
$ ifconfig eth2 0.0.0.0 promisc up
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Create Bridge
$ brctl addbr br0
$ brctl setfd br0 0
# Debian 6.0.10
$ brctl sethello br0 0
# Debian 7.9.0
$ brctl sethello br0 1
$ brctl addif br0 eth1
$ brctl addif br0 eth2
$ brctl stp br0 off
$ ifconfig br0 up
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Avoid Unknown Problems
$ echo 1 > /proc/sys/net/ipv4/icmp_echo_ignore_broadcasts
$ echo 0 > /proc/sys/net/ipv4/ip_forward
$ echo 0 > /proc/sys/net/ipv4/tcp_syncookies
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First Netfilter Kernel Module
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Modify main.c
Include Header Files
Forward Hook
Hook Declaration
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Modify main.c
Include Header Files
Forward Hook
Hook Declaration
If one header miss,compilation still success.
But, operating systemwill crash when module inserting.
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Modify main.c
Register Hook
Unregister Hook
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Install
$ make
$ make install
$ dmesg
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Test your Netfilter Kernel Module
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CLIENT of VMnet2
$ sudo ip route add 192.168.103.0/24 via 192.168.102.128
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CLIENT of VMnet3
$ sudo ip route add 192.168.102.0/24 via 192.168.103.128
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Test on CLIENT of VMnet2
$ ping 192.168.103.128
For all packets, forwarding is accepted.
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Modify main.c
Include Header Files
Forward Hook
Hook Declaration
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Reinstall
$ make remove
$ make
$ make install
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Test on CLIENT of VMnet2
$ ping 192.168.103.128
For all packets, forwarding is rejected.
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Next Part
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Firewall 101