[转]在pcDuino实现AP--wifi热点共享
本帖最后由 迷你强 于 2013-6-21 13:17 编辑前面有两篇文章，一篇是pcduino内核开发指南，一篇是移植rt5370 soft AP驱动。是这篇文章的基础，如果你想实现本文介绍的效果请先完成前面文章介绍的内容。（一）支持iptablespcduino的内核是不支持NAT的，很明显的标志是当你执行iptables -L的时候他会提示你需要更新内核。如果想实现，必须要重新配置内核。具体的配置过程请参照前面的文章，这里介绍配置的内容。 Networking support--->Networking options---> Network packet filtering framework (Netfilter)--->Core Netfilter Configuration--->-*- Netfilter LOG over NFNETLINK interface<*> Netfilter connection tracking support-*- Netfilter Xtables support (required for ip_tables)IP: Netfilter Configuration--->http://www.linksprite.com/cnblog/wp-content/uploads/2013/04/65-300x212.png（重要的选项已标记）配置完成后重新编译内核，并将编译好的内核烧写。重启系统，执行root@ubuntu:/home/ubuntu# iptables -L
Chain INPUT (policy ACCEPT)
target prot opt source destinationChain FORWARD (policy ACCEPT)
target prot opt source destinationChain OUTPUT (policy ACCEPT)
target prot opt source destination这是没有添加任何过滤和转发功能的iptables。（二）hostapdhostapd 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。pcduino的软件源里面是有hostapd,但是要实现wifi热点不能用，因为配置上有些问题，从下面的过程中你会知道原因。在http://hostap.epitest.fi/hostapd/的官网上可以下载hostapd的源码。由于rt5370并不是很新的硬件，请选择在ftp http://hostap.epitest.fi/releases/选择1.0版本，下载完成后tar xvf hostapd-1.0.tar.gzcd hostapd-1.0/hostapd/vim defconfig找到#CONFIG_IEEE80211N=y 去掉前面的#注释，我们在通过apt-get 得到的是没有加这个选项，在使用的时候他会提示nl80211: 'nl80211' generic netlink not found
Failed to initialize driver 'nl80211'修改之后，cp defconfig .configmakemake install在make的时候会出现错误。具体的bug信息如下：../src/drivers/driver_nl80211.c:19:31: fatal error: netlink/genl/genl.h: No such file or directory
compilation terminated.
make: *** [../src/drivers/driver_nl80211.o] Error 1这里要安装一些库。sudo apt-get install libnl-dev
sudo apt-get install libssl-dev安装完成之后。执行hostapd -vroot@ubuntu:~# hostapd -v
hostapd v1.0
User space daemon for IEEE 802.11 AP management,
IEEE 802.1X/WPA/WPA2/EAP/RADIUS Authenticator
Copyright (c) 2002-2012, Jouni Malinen <[email protected]> and contributors可以看到版本信息，说明安装成功。（三）配置hostapdvim /etc/hostapd.conf内容如下：root@ubuntu:~# vim /etc/hostapd.conf
interface=wlan3
driver=nl80211
ssid=China
hw_mode=g
channel=11
dtim_period=1
rts_threshold=2347
fragm_threshold=2346
macaddr_acl=0
auth_algs=1
ieee80211n=0
wpa=2
wpa_passphrase=1234567890
wpa_key_mgmt=WPA-PSK
wpa_pairwise=TKIP
rsn_pairwise=CCMP从配置文件可以看到我们要共享的wifi热点的名字：ssid=China密码：wpa_passphrase=1234567890加密方式：wpa_key_mgmt=WPA-PSK保存之后执行hostapd -dd /etc/hostapd.conf.会打印一下信息。root@ubuntu:~# hostapd -dd /etc/hostapd.conf
random: Trying to read entropy from /dev/random
Configuration file: /etc/hostapd.conf
nl80211: interface wlan3 in phy phy3
rfkill: initial event: idx=0 type=2 op=0 soft=0 hard=0
rfkill: initial event: idx=4 type=1 op=0 soft=0 hard=0
nl80211: Using driver-based off-channel TX
nl80211: Register frame command failed (type=208): ret=-114 (Operation already in progress)
nl80211: Register frame match - hexdump(len=1): 06
nl80211: Failed to register Action frame processing - ignore for now
nl80211: Add own interface ifindex 23
nl80211: Set mode ifindex 23 iftype 3 (AP)
nl80211: Create interface iftype 6 (MONITOR)
Failed to create interface mon.wlan3: -23 (Too many open files in system)
Try to remove and re-create mon.wlan3
nl80211: Remove interface ifindex=37
nl80211: Create interface iftype 6 (MONITOR)
nl80211: New interface mon.wlan3 created: ifindex=38
nl80211: Add own interface ifindex 38
BSS count 1, BSSID mask 00:00:00:00:00:00 (0 bits)
nl80211: Regulatory information - country=00
nl80211: 2402-2472 @ 40 MHz
nl80211: 2457-2482 @ 40 MHz
nl80211: 2474-2494 @ 20 MHz
nl80211: 5170-5250 @ 40 MHz
nl80211: 5735-5835 @ 40 MHz
nl80211: Added 802.11b mode based on 802.11g information
Allowed channel: mode=1 chan=1 freq=2412 MHz max_tx_power=20 dBm
Allowed channel: mode=1 chan=2 freq=2417 MHz max_tx_power=20 dBm
Allowed channel: mode=1 chan=3 freq=2422 MHz max_tx_power=20 dBm
Allowed channel: mode=1 chan=4 freq=2427 MHz max_tx_power=20 dBm
Allowed channel: mode=1 chan=5 freq=2432 MHz max_tx_power=20 dBm
Allowed channel: mode=1 chan=6 freq=2437 MHz max_tx_power=20 dBm
Allowed channel: mode=1 chan=7 freq=2442 MHz max_tx_power=20 dBm
Allowed channel: mode=1 chan=8 freq=2447 MHz max_tx_power=20 dBm
Allowed channel: mode=1 chan=9 freq=2452 MHz max_tx_power=20 dBm
Allowed channel: mode=1 chan=10 freq=2457 MHz max_tx_power=20 dBm
Allowed channel: mode=1 chan=11 freq=2462 MHz max_tx_power=20 dBm
Allowed channel: mode=1 chan=13 freq=2472 MHz max_tx_power=20 dBm
Allowed channel: mode=0 chan=1 freq=2412 MHz max_tx_power=20 dBm
Allowed channel: mode=0 chan=2 freq=2417 MHz max_tx_power=20 dBm
Allowed channel: mode=0 chan=3 freq=2422 MHz max_tx_power=20 dBm
Allowed channel: mode=0 chan=4 freq=2427 MHz max_tx_power=20 dBm
Allowed channel: mode=0 chan=5 freq=2432 MHz max_tx_power=20 dBm
Allowed channel: mode=0 chan=6 freq=2437 MHz max_tx_power=20 dBm
Allowed channel: mode=0 chan=7 freq=2442 MHz max_tx_power=20 dBm
Allowed channel: mode=0 chan=8 freq=2447 MHz max_tx_power=20 dBm
Allowed channel: mode=0 chan=9 freq=2452 MHz max_tx_power=20 dBm
Allowed channel: mode=0 chan=10 freq=2457 MHz max_tx_power=20 dBm
Allowed channel: mode=0 chan=11 freq=2462 MHz max_tx_power=20 dBm
Allowed channel: mode=0 chan=13 freq=2472 MHz max_tx_power=20 dBm
Completing interface initialization
Mode: IEEE 802.11g Channel: 11 Frequency: 2462 MHz
nl80211: Set freq 2462 (ht_enabled=0 sec_channel_offset=0)
RATE rate=10 flags=0x1
RATE rate=20 flags=0x1
RATE rate=55 flags=0x1
RATE rate=110 flags=0x1
RATE rate=60 flags=0x0
RATE rate=90 flags=0x0
RATE rate=120 flags=0x0
RATE rate=180 flags=0x0
RATE rate=240 flags=0x0
RATE rate=360 flags=0x0
RATE rate=480 flags=0x0
RATE rate=540 flags=0x0
Flushing old station entries
Deauthenticate all stations
wpa_driver_nl80211_set_key: ifindex=23 alg=0 addr=(nil) key_idx=0 set_tx=0 seq_len=0 key_len=0
wpa_driver_nl80211_set_key: ifindex=23 alg=0 addr=(nil) key_idx=1 set_tx=0 seq_len=0 key_len=0
wpa_driver_nl80211_set_key: ifindex=23 alg=0 addr=(nil) key_idx=2 set_tx=0 seq_len=0 key_len=0
wpa_driver_nl80211_set_key: ifindex=23 alg=0 addr=(nil) key_idx=3 set_tx=0 seq_len=0 key_len=0
Using interface wlan3 with hwaddr 00:c3:16:a0:03:ca and ssid 'China'
Deriving WPA PSK based on passphrase
SSID - hexdump_ascii(len=5):
43 68 69 6e 61 China
PSK (ASCII passphrase) - hexdump_ascii(len=10):
PSK (from passphrase) - hexdump(len=32):
random: Got 20/20 bytes from /dev/random
Get randomness: len=32 entropy=0
GMK - hexdump(len=32):
Get randomness: len=32 entropy=0
Key Counter - hexdump(len=32):
WPA: Delay group state machine start until Beacon frames have been configured
nl80211: Set beacon (beacon_set=0)
WPA: Start group state machine to set initial keys
WPA: group state machine entering state GTK_INIT (VLAN-ID 0)
Get randomness: len=16 entropy=0
GTK - hexdump(len=16):
WPA: group state machine entering state SETKEYSDONE (VLAN-ID 0)
wpa_driver_nl80211_set_key: ifindex=23 alg=3 addr=0x3b864 key_idx=1 set_tx=1 seq_len=0 key_len=16
broadcast key
wpa_driver_nl80211_set_operstate: operstate 0->1 (UP)
netlink: Operstate: linkmode=-1, operstate=6
wlan3: Setup of interface done.
RTM_NEWLINK: operstate=1 ifi_flags=0x1002 ()
nl80211: Ignore interface down event since interface wlan3 is up
nl80211: Ignore event for foreign ifindex 37
nl80211: Ignore dellink event for foreign ifindex 37
RTM_NEWLINK: operstate=1 ifi_flags=0x1002 ()
nl80211: Ignore interface down event since interface mon.wlan3 is up
RTM_NEWLINK: operstate=1 ifi_flags=0x11043 ()
RTM_NEWLINK, IFLA_IFNAME: Interface 'mon.wlan3' added
Unknown event 5
RTM_NEWLINK: operstate=1 ifi_flags=0x11043 ()
RTM_NEWLINK, IFLA_IFNAME: Interface 'wlan3' added
nl80211: if_removed already cleared - ignore event
nl80211: Event message available
nl80211: Delete station c4:6a:b7:69:9c:14
mgmt::deauth cb
Add randomness: count=1 entropy=0
Add randomness: count=2 entropy=1
Add randomness: count=3 entropy=2
Add randomness: count=4 entropy=3
Add randomness: count=5 entropy=4
Add randomness: count=6 entropy=5
Add randomness: count=7 entropy=6
Add randomness: count=8 entropy=7
Add randomness: count=9 entropy=8
Add randomness: count=10 entropy=9
Add randomness: count=11 entropy=10
Add randomness: count=12 entropy=11
Add randomness: count=13 entropy=12
Add randomness: count=14 entropy=13
Add randomness: count=15 entropy=14以上信息中有个nl80211: Failed to register Action frame processing - ignore for now,可以看出已经 ignore，这说明这个错误不重要，重要的话她会停止。这里需要说明一下，执行hostapd -dd/etc/hostapd.conf它是不会停止的，他会一直添加随机的添加数字去加解密。我们需要手动的Ctrl+C把他中断掉。(四)安装DHCP服务器sudo apt-get install dhcp3-server完成之后需要配置dhcp服务器。vim/etc/dhcp/dhcpd.conf在后面加上subnet 192.168.0.0 netmask 255.255.255.0
{
range 192.168.0.2 192.168.0.10;
option routers 192.168.0.1; #网关，即wlan3的IP地址
option domain-name-servers 8.8.8.8;
}重启hostapd，参数-B是hostapd后台运行。sudo killall hostapdhostapd -B /etc/hostapd.conf设置无线网络的IPifconfig wlan3 192.168.0.1启动dhcp-server$dhcpd wlan3-pf /var/run/dhcp-server/dhcpd.pid打开IP转发echo 1 >/proc/sys/net/ipv4/ip_forward设置NATsudo iptables -t nat -A POSTROUTING -o eth0 -j MASQUERADE有图有真相，下面是pcDuino实现AP的图片。首先是电脑上连APhttp://www.linksprite.com/cnblog/wp-content/uploads/2013/04/76-269x300.pnghttp://www.linksprite.com/cnblog/wp-content/uploads/2013/04/85-300x195.png
小米手机连APhttp://www.linksprite.com/cnblog/wp-content/uploads/2013/04/94-168x300.pnghttp://www.linksprite.com/cnblog/wp-content/uploads/2013/04/105-168x300.png(注意IP地址)三星S3连APhttp://www.linksprite.com/cnblog/wp-content/uploads/2013/04/113-168x300.jpg
下面查看pcduino的IP
wlan3 Link encap:Ethernet HWaddr 00:c3:16:a0:03:ca
inet addr:192.168.0.1 Bcast:192.168.0.255 Mask:255.255.255.0
inet6 addr: fe80::2c3:16ff:fea0:3ca/64 Scope:Link
UP BROADCAST RUNNING MULTICAST MTU:1500 Metric:1
RX packets:5862 errors:0 dropped:0 overruns:0 frame:0
TX packets:4221 errors:0 dropped:0 overruns:0 carrier:0
collisions:0 txqueuelen:1000
RX bytes:1204735 (1.2 MB) TX bytes:907948 (907.9 KB)AP完美实现
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