飞凌2440开发板制作路由器

原文链接：http://www.cnblogs.com/NickQ/p/8976054.html
环境：Linux3.0内核 RT3070（无线） + DM9000（有线）

在s3c2440上实现SoftAP模式

• 配置内核

---

• 配置完内核开始编译后，报如下错误。

解决方法：make clean后重新编译。
参考：https://blog.csdn.net/tonkeytong/article/details/52672782

[nick@XQLY linux-3.0]$ make
  CHK     include/linux/version.h
  CHK     include/generated/utsrelease.h
make[1]: “include/generated/mach-types.h”是最新的。
  CALL    scripts/checksyscalls.sh
  CHK     include/generated/compile.h
  LD      fs/nfs/nfs.o
fs/nfs/client.o: file not recognized: File truncated
make[2]: *** [fs/nfs/nfs.o] 错误 1
make[1]: *** [fs/nfs] 错误 2
make: *** [fs] 错误 2

---

• libnl 移植

Hostapd依赖于openssl与libnl两个库。
下载解压

wget  
tar zvxf libnl-3.2.25.tar.gz
cd ./libnl-3.2.25
mkdir install

配置并编译

    ./configure --prefix=`pwd`/install --build=i686-pc-linux --host=arm-linux CC=/opt/xtools/arm920t/bin/arm-linux-gcc AS=/opt/xtools/arm920t/bin/arm-linux-as  AR=/opt/xtools/arm920t/bin/arm-linux-ar LD=/opt/xtools/arm920t/bin/arm-linux-ld NM=/opt/xtools/arm920t/bin/arm-linux-nm RANLIB=/opt/xtools/arm920t/bin/arm-linux-ranlib OBJDUMP=/opt/xtools/arm920t/bin/arm-linux-objdump STRIP=/opt/xtools/arm920t/bin/arm-linux-strip
    
    make && make install

• openssl 移植

下载解压

wget  
tar zxvf openssl-0.9.8zf.tar.gz
cd ./openssl-0.9.8zf
patch -p1 < ../patch/openssl-0.9.8zf-tls-extensions.patch
mkdir install

修改Makefile

将
OPTIONS= no-camellia no-capieng no-cms no-gmp no-jpake no-krb5 no-mdc2 no-montasm no-rc5 no-rfc3779 no-seed no-shared no-zlib no-zlib-dynamic
CONFIGURE_ARGS=dist
改为
#OPTIONS= no-camellia no-capieng no-cms no-gmp no-jpake no-krb5 no-mdc2 no-montasm no-rc5 no-rfc3779 no-seed no-shared no-zlib no-zlib-dynamic
CC=/opt/xtools/arm920t/bin/arm-linux-gcc
CONFIGURE_ARGS=dist
修改以下变量
INSTALLTOP= /home/nick/fl2440/3rdparty/wireless/openssl/openssl-0.9.8zf/install
OPENSSLDIR= /home/nick/fl2440/3rdparty/wireless/openssl/openssl-0.9.8zf/install
CC= /opt/xtools/arm920t/bin/arm-linux-cc
AR= /opt/xtools/arm920t/bin/arm-linux-ar $(ARFLAGS) r
ARD= /opt/xtools/arm920t/bin/arm-linux-ar $(ARFLAGS) d
RANLIB= /opt/xtools/arm920t/bin/arm-linux-ranlib

编译安装

sudo make
sudo make install

• Hostapd 移植

hostapd 是一个用户态用于AP和认证服务器的守护进程。它实现了IEEE 802.11相关的接入管理，IEEE 802.1X/WPA/WPA2/EAP 认证, RADIUS客户端，EAP服务器和RADIUS 认证服务器。Linux下支持的驱动有：Host AP，madwifi，基于mac80211的驱动。
采用脚本，编译安装

    #!/bin/bash
    
    # Description:  
    # This shell script used download and compile hostapd for ARM 
    
    PROJ_PATH=`pwd`
    
    OPENSSL_PATH=`pwd`/../openssl/
    LIBNL_PATH=`pwd`/../libnl/
    
    if [ -z $CROSSTOOL ] ; then
       CROSSTOOL=/opt/xtools/arm920t/bin/arm-linux-
    fi
    
    function msg_banner()
    {
        echo ""
        echo "+-----------------------------------------------------------------------"
        echo "|  $1 "
        echo "+-----------------------------------------------------------------------"
        echo ""
    }
    
    function check_result()
    {
        if [ $? != 0 ] ; then
           echo ""
           echo "+-----------------------------------------------------------------------"
           echo "|  $1 "
           echo "+-----------------------------------------------------------------------"
           echo ""
           exit ;
        fi
    }
    
    function export_cross()
    {
        # export cross toolchain
        export CC=${CROSSTOOL}gcc
        export AS=${CROSSTOOL}as
        export AR=${CROSSTOOL}ar
        export LD=${CROSSTOOL}ld
        export NM=${CROSSTOOL}nm
        export RANLIB=${CROSSTOOL}ranlib
        export OBJDUMP=${CROSSTOOL}objdump
        export STRIP=${CROSSTOOL}strip
    
        # export cross configure 
        export CONFIG_CROSS=" --build=i686-pc-linux --host=arm-linux "
    
        # Clear LDFLAGS and CFLAGS
        export LDFLAGS=
        export CFLAGS=
    }
    
    function compile_hostapd()
    {
        SRC_NAME=hostapd-2.5
        PACK_SUFIX=tar.gz
    
    
        if [ -f ${PREFIX_PATH}/${IMG_NAME} ] ; then
            return 0;
        fi
    
        msg_banner "Start cross compile $SRC_NAME "
    
        if [ ! -f ${SRC_NAME}.${PACK_SUFIX} ] ; then
            wget https://w1.fi/releases/${SRC_NAME}.${PACK_SUFIX}
            check_result "ERROR: download ${SRC_NAME} failure"
        fi
    
        tar -xzf ${SRC_NAME}.${PACK_SUFIX}
        cd ${SRC_NAME}/hostapd
    
        cp defconfig .config
    
        #sed -i -e "s|^.*openssl/include.*|CFLAGS += -I${OPENSSL_PATH}/install/include|g" .config 
        #sed -i -e "s|^.*openssl/lib.*|LIBS += -L${OPENSSL_PATH}/install/lib|g" .config 
        
        sed -i -e "s|^.*libnl include files.*|CFLAGS += -I${LIBNL_PATH}/install/include/libnl3|g" .config 
        sed -i -e "s|^.*libnl library files.*|LIBS += -L${LIBNL_PATH}/install/lib|g" .config 
    
        sed -i -e "s|^.*CONFIG_LIBNL32=.*|CONFIG_LIBNL32=y|g" .config 
    
        export PKG_CONFIG_PATH=${LIBNL_PATH}/install/lib/pkgconfig/:$PKG_CONFIG_PATH
    
        export CFLAGS="-I${OPENSSL_PATH}/install/include"
        export LIBS="-L${OPENSSL_PATH}/install/lib"
    
        make  
    
        cp hostapd ${PROJ_PATH}/
        cp $LIBNL_PATH/install/lib/libnl-3.so.200.20.0 ${PROJ_PATH}/libnl-3.so.200 
        cp $LIBNL_PATH/install/lib/libnl-genl-3.so.200.20.0 ${PROJ_PATH}/libnl-genl-3.so.200
    
        cd -
    }
    
    
    export_cross
    
    if [ ! -d $OPENSSL_PATH/install/lib ] ; then
       cd $OPENSSL_PATH
       ./build.sh
       cd -
    else 
        msg_banner "openssl already cross compiled!"
    fi
    
    
    
    if [ ! -d $LIBNL_PATH/install/lib ] ; then
       cd $LIBNL_PATH
       ./build.sh
       cd -
    else 
        msg_banner "libnl already cross compiled!"
    fi
    
    
    compile_hostapd

将生成的hostapd,和库拷到开发板/bin与/lib目录下，并给予可执行权限。这里采用lszrz+tftp方式

[nick@XQLY hostapd]$ sz hostapd
rz
Starting zmodem transfer.  Press Ctrl+C to cancel.
Transferring hostapd...
  100%    1768 KB    1768 KB/sec    00:00:01       0 Errors 
[nick@NickQ_fl2440 bin]# tftp -gr hostapd 192.168.110.1
hostapd              100% |*******************************|  1768k  0:00:00 ETA
[nick@NickQ_fl2440 bin]# chmod a+x hostapd

可以将hostapd目录下的hostapd.conf修改后拷贝到开发板/etc下，也可以直接新建一个，这里选择直接新建。
在开发板/etc目录下创建这个文件hostapd.conf。

interface=wlan0 //网络接口名称
ssid=nick666 //热点名称
driver=nl80211  //默认使用nl80211无线驱动
channel=3   //设定无线频道
hw_mode=g   //使用80211g协议标准 , 有效的值取决于硬件,通常:a, b, g
ignore_broadcast_ssid=0 //开启或禁用广播ssid
auth_algs=1 /*指定OSA认证算法, auth_algs=1 只支持 WPA2 身份验证算法。*/
/*auth_algs=2 表示支持 WEP。永远不要使用有线等效加密 (wired equivalent privacy, WEP)，因为它非常容易破解，并且多年前就已经被完全破解了。*/
/*auth_algs=3 表示支持这两种方式。*/
wpa=3   /*指定WPA/WPA2类型, wpa=2 仅支持 WPA2。wpa=1 表示支持 WPA1，而 wpa=3 表示二者都支持。*/
wpa_key_mgmt=WPA-PSK    //指定您想支持的加密密钥算法
wpa_passphrase=12345678 //指定认证密钥
wpa_pairwise=TKIP   /*启用了WPA或WPA2则需要指定wpa_pairwise或rsn_pairwise。*/
rsn_pairwise=CCMP   /*wpa_pairwise 和 rsn_pairwise控制支持加密数据的密钥，您可以使用 CCMP、TKIP 或两者均使用*/

---

启用hostapd

hostapd -B /etc/hostapd.conf

ifconfig观察发现，多了网卡

mon.wlan0 Link encap:UNSPEC  HWaddr 00-A1-B0-40-6F-1E-00-00-00-00-00-00-00-00-00-00  
          UP BROADCAST RUNNING MULTICAST  MTU:1500  Metric:1
          RX packets:0 errors:0 dropped:0 overruns:0 frame:0
          TX packets:0 errors:0 dropped:0 overruns:0 carrier:0
          collisions:0 txqueuelen:1000 
          RX bytes:0 (0.0 B)  TX bytes:0 (0.0 B)

udhcpd启用DHCP分配IP

[nick@NickQ_fl2440 ~]# udhcpd -f /etc/udhcpd.conf
udhcpd: started, v1.27.1
phy0 -> rt2800_txdone_entry_check: Warning - TX status report missed for queue 2 entry 0
udhcpd: sending OFFER of 192.168.10.20
udhcpd: sending OFFER of 192.168.10.20
udhcpd: sending ACK to 192.168.10.20
udhcpd: sending ACK to 192.168.10.20

udhcpd -f 选项是保持在前台运行。去掉-f则转为后台。

iptables移植

使用脚本编译安装

#!/bin/bash


# Description:  
# This shell script used download and compile iptables for ARM

PREFIX_PATH=`pwd`/

if [ -z $CROSSTOOL ] ; then
   CROSSTOOL=/opt/xtools/arm920t/bin/arm-linux-
fi

function msg_banner()
{
    echo ""
    echo "+-----------------------------------------------------------------------"
    echo "|  $1 "
    echo "+-----------------------------------------------------------------------"
    echo ""
}

function check_result()
{
    if [ $? != 0 ] ; then
       echo ""
       echo "+-----------------------------------------------------------------------"
       echo "|  $1 "
       echo "+-----------------------------------------------------------------------"
       echo ""
       exit ;
    fi
}

function export_cross()
{
    # export cross toolchain
    export CC=${CROSSTOOL}gcc
    export AS=${CROSSTOOL}as
    export AR=${CROSSTOOL}ar
    export LD=${CROSSTOOL}ld
    export NM=${CROSSTOOL}nm
    export RANLIB=${CROSSTOOL}ranlib
    export OBJDUMP=${CROSSTOOL}objdump
    export STRIP=${CROSSTOOL}strip

    # export cross configure 
    export CONFIG_CROSS=" --build=i686-pc-linux --host=arm-linux "

    # Clear LDFLAGS and CFLAGS
    export LDFLAGS=
    export CFLAGS=
}

function compile_iptables()
{
    SRC_NAME=iptables-1.4.21
    PACK_SUFIX=tar.bz2
    IMG_NAME=iptables

    if [ -f ${PREFIX_PATH}/${IMG_NAME} ] ; then
        return 0;
    fi

    msg_banner "Start cross compile $SRC_NAME "

    if [ ! -f ${SRC_NAME}.${PACK_SUFIX} ] ; then
        wget http://www.netfilter.org/projects/iptables/files/${SRC_NAME}.${PACK_SUFIX}
        check_result "ERROR: download ${SRC_NAME} failure"
    fi

    tar -xjf ${SRC_NAME}.${PACK_SUFIX}
    cd ${SRC_NAME}

    ./configure --prefix=${PREFIX_PATH} ${CONFIG_CROSS} --enable-static --disable-shared --disable-ipv6 --disable-largefile  
    check_result "ERROR: configure ${SRC_NAME} failure"

    make 
    check_result "ERROR: compile ${SRC_NAME} failure"

    ${STRIP} iptables/xtables-multi
    cp iptables/xtables-multi ${PREFIX_PATH}/${IMG_NAME}

    cd -
}


export_cross

compile_iptables

---

再理解一次CFLAGS和LDFLAGS:一般我们通过CFLAGS的 -I 选项告诉编译器所依赖的第三方的库的头文件在哪里，通过LDFLAGS的-L选项告诉链接器这些库的库文件在哪里；还有LIBS是告诉链接器要链接哪些库文件。简单地说，LDFLAGS是告诉链接器从哪里寻找库文件，而LIBS是告诉链接器要链接哪些库文件。有时候LIBS指定了却找不到库时可以试试LDFLAGS。

---

[nick@NickQ_fl2440 ~]# iptables -t nat -A POSTROUTING -o eth0 -j MASQUERADE
[nick@NickQ_fl2440 ~]# iptables -A FORWARD -i eth0 -o wlan0 -m state --state RELATED,ESTABLISH -j ACCEPT
[nick@NickQ_fl2440 ~]# iptables -A FORWARD -i wlan0 -o eth0 -j ACCEPT 

自动启动
在开发板/etc/init.d/中，创建启动脚本.以S?? ,如开头S30_wifiAP

#!/bin/sh

ifconfig wlan0 192.168.10.1 netmask 255.255.255.0 up

iptables -t nat -A POSTROUTING -o eth0 -j MASQUERADE
iptables -A FORWARD -i eth0 -o wlan0 -m state --state RELATED,ESTABLISH -j ACCEPT
iptables -A FORWARD -i wlan0 -o eth0 -j ACCEPT

hostapd -B /etc/hostapd.conf

udhcpd  /etc/udhcpd.conf