jslinux带网络功能的内核

想重新编译jslinux-network
的内核，其实就是比fabrice bellard的内核多了个e1000的网卡
使内核与用户空间通信的netlink socket可用
测试即是
ip link可用

关键点是[b]make ARCH=i386 drivers/net/e1000/[/b]

最后一个/不能少
测试环境32位的centos7：
[code="java"]
# uname -a
Linux centos32 3.10.0-327.18.2.el7.i686 #1 SMP Fri May 13 02:29:38 UTC 2016 i686 i686 i386 GNU/Linux
# cat /etc/redhat-release
CentOS Linux release 7.2.1511 (AltArch)
# make -v
GNU Make 3.82
Built for i386-redhat-linux-gnu
Copyright (C) 2010 Free Software Foundation, Inc.
License GPLv3+: GNU GPL version 3 or later <http://gnu.org/licenses/gpl.html>
This is free software: you are free to change and redistribute it.
There is NO WARRANTY, to the extent permitted by law.
# gcc --version
gcc (GCC) 4.8.5 20150623 (Red Hat 4.8.5-4)
Copyright (C) 2015 Free Software Foundation, Inc.
This is free software; see the source for copying conditions. There is NO
warranty; not even for MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.


[/code]


buildroot-2016.08.1.tar.gz

如果是普通的fabrice的内核

2.6.20 + buildroot
/ # ip link
[color=red]Cannot open netlink socket: Invalid argument[/color]

bzImage4.0.3 +buildroot
3个设备，lo，eth0,sit0@NONE
这个内核比较大，后面放编译方法


判断是内核的问题导致netlink socket错误
找遍了.config内核选项，network driver相关的都没有
其实网卡因为太多相关不在.config里面
pwd
/opt/jslinux/kernel/linux-2.6.20

make ARCH=i386  drivers/net/e1000/

在网卡目录生成built-in.o
再编译内核

time make ARCH=i386 -j16

参考《LINUX+2.6内核标准教程》
生成内核的步骤
[b]
1.内核编译的时候会根据arch/i386/kernel/vmLinux.lds
把所有的buildin编译进内核，生成未压缩的src/vmLinux,连接偏移地址0xc0000000
[color=red]（这里把e1000的网卡也编译进去了）[/color]
2.objcopy生成 /arch/i386/boot/compressd/vmlinux.bin
gzip生成vmlinux.bin.gz)
ld 根据连接脚本vmlinux.scr生成piggy.o
3.misc.o解压缩的c代码
head.o汇编为解压缩设置参数和堆栈
和piggy.o
ld生成arch/i386/boot/compressed/vmLinux
4.objcopy 生成 arch/i386/boot/vmLinux.bin
5.用build将bootsect（512字节），setup（512字节） ，vmLinux.bin生成bzImage
[/b]

有了bzImage我们就可以用qemu启动了vm了

qemu-system-i386 -kernel  /opt/jslinux/kernel/linux-2.6.20/arch/i386/boot/bzImage -drive file=hda.img.lspci,if=ide,cache=none -append "console=ttyS0 root=/dev/hda rw rdinit=/sbin/init notsc=1"  -boot order=dc,menu=on -net nic,vlan=0,macaddr=52:54:00:12:34:22,model=e1000,addr=08 -net tap,ifname=tap1,script=./if-up,downscript=./if-down -nographic

ip link不报错了

虽然qemu还是访问不了外网，但是这个额内核已经可以给jslinux-network使用了


具体步骤如下
★★★★
编译内核：
linux-2.6.20.tar.gz
ls
linux-2.6.20 tmp/linuxstart-20120111

cp tmp/linuxstart-20120111/config_linux-2.6.20 linux-2.6.20/.config
vim linux-2.6.20/.config
CONFIG_TUN=y

添加tun的支持

cd linux-2.6.20
[code="java"]
patch -p1 < ../tmp/linuxstart-20120111/patch_linux-2.6.20
patching file drivers/char/Kconfig
patching file drivers/char/Makefile
patching file drivers/char/jsclipboard.c
patching file drivers/serial/8250.c
patching file drivers/ide/ide-probe.c

patch -p1 < /var/www/jslinux_reversed/contrib/patches/2.6.20_common_fixes.patch
patching file arch/i386/kernel/Makefile
patching file kernel/mutex.c
patching file scripts/mod/sumversion.c
#
[/code]
代码在
[url]https://github.com/killinux/jslinux_reversed[/url]
[url]https://github.com/killinux/jslinux-network[/url]
为了适应本机的
gcc version 4.8.5 20150623 (Red Hat 4.8.5-4) (GCC)
vim Makefile
搜索/config %config

config %config: scripts_basic outputmakefile FORCE
改成
%config: scripts_basic outputmakefile FORCE

搜索/\/ %\/

/ %/: prepare scripts FORCE
改成
%/: prepare scripts FORCE

[b][color=red]这里最重要[/color][/b]

make ARCH=i386  drivers/net/e1000/

vim .config
确认 CONFIG_TUN=y是否还在
如果在 ，就执行

time make ARCH=i386 -j16

生成 linux-2.6.20/arch/i386/boot/bzImage

cd ../tmp/linuxstart-20120111/

生成jslinux可用的
vim Makefile
指定刚才的kernel路径
修改KERNEL_PATH=../../linux-2.6.20

make kernel 生成vmlinux26.bin

cp vmlinux2.6.bin /var/www/jslinux-network/

vim jslinux-network/jslinux.js

    if (!kernel_name)
        //kernel_name = "vmlinux-2.6.20.bin";
        kernel_name = "vmlinux26.bin";

启动websocket的服务端进程，建立tap的通道
jslinux-network/websocketstuntap/launch.sh

进入jslinux-network

cat /dev/clipboard|sh

建立tap0

启动web页面上的connect or reconnect websockets
ping 10.0.2.2

以上是内核编译替换成功了
下面替换硬盘文件

###################################另外###########
如果想要带lo,eth0,sit0的的内核，
把
[url]http://dl2.iteye.com/upload/attachment/0121/2645/d7cb6c0e-5039-30d7-a08a-49019f17d18c.jpeg[/url]
保存成.config编译linux-4.0.3的内核得到bzImage即可
内核的下载地址
[url]https://www.kernel.org/pub/linux/kernel/v2.6/[/url]
测试

qemu-system-i386 -kernel bzImage -drive file=root.bin,if=ide,cache=none -append "console=ttyS0 root=/dev/sda rw rdinit=/sbin/init notsc=1"  -boot order=dc,menu=on -net nic,vlan=0,macaddr=52:54:00:12:34:22,model=e1000,addr=08 -net tap,ifname=tap1,script=./if-up,downscript=./if-down -nographic

进入vm测试

ifconfig eth0 192.168.122.3 netmask 255.255.255.0 
route add default gw 192.168.122.1
echo "nameserver 114.114.114.114" >/etc/resolv.conf
ping www.baidu.com

其中
[code="java"]
# cat if-up
#!/bin/sh
ip link set tap1 up
#brctl addif br0 tap1
brctl addif virbr0 tap1
[/code]