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CSI Tool Data collection 数据收集

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Installation Instructions, Linux 802.11n CSI Tool — Installation Instructions

These instructions are currently expected to work on Linux operating systems that are based on an upstream Linux kernel version between 3.2 (e.g. Ubuntu 12.04) and 4.2 (e.g. Ubuntu 14.04.4).

An older version of this page, used with the original testbed at the University of Washington, is archived here.

1. Prerequisites

# Install the build tools, the Linux development headers, and the Git client. On Ubuntu, run:
sudo apt-get install gcc make linux-headers-$(uname -r) git-core

# **Tip:** To maintain greater control over the wireless interface during your experiments, you will likely want to configure it using command-line utilities such as *iw* and *iproute2*. If so, you first need to disable *NetworkManager* from controlling the wireless interface (if it is installed). On Ubuntu, run:
sudo apt-get install iw
echo iface wlan0 inet manual | sudo tee -a /etc/network/interfaces
sudo restart network-manager

# **Tip:** If you want to prevent the wireless driver from automatically loading during boot (particularly if you are developing your own modifications to the driver), run:
echo blacklist iwldvm | sudo tee -a /etc/modprobe.d/csitool.conf
echo blacklist iwlwifi | sudo tee -a /etc/modprobe.d/csitool.conf

2. Build and Install the Modified Wireless Driver

# Obtain the CSI Tool Linux source tree, which includes modifications to the wireless driver, and check out the appropriate tag in the repository for your *upstream* kernel version:
CSITOOL_KERNEL_TAG=csitool-$(uname -r | cut -d . -f 1-2)
git clone https://github.com/dhalperi/linux-80211n-csitool.git
cd linux-80211n-csitool
git checkout ${CSITOOL_KERNEL_TAG}

# **Tip:** You can then merge these driver modifications into the Linux source tree for your *distribution-provided* kernel version, in order to improve compatibility. On Ubuntu, run:
UBUNTU_KERNEL_TAG=Ubuntu-3.13.0-32.57
# Modify the line above with your Ubuntu kernel tag. First, determine your full kernel
# version by reading /proc/version_signature; then, look up the Ubuntu kernel tag at:
# http://people.canonical.com/~kernel/info/kernel-version-map.html

. /etc/lsb-release
git remote add ubuntu git://kernel.ubuntu.com/ubuntu/ubuntu-${DISTRIB_CODENAME}.git
git pull --no-edit ubuntu ${UBUNTU_KERNEL_TAG}

# Build the modified driver for the existing kernel:
make -C /lib/modules/$(uname -r)/build M=$(pwd)/drivers/net/wireless/iwlwifi modules

# Install the modified driver into the module updates directory:
sudo make -C /lib/modules/$(uname -r)/build M=$(pwd)/drivers/net/wireless/iwlwifi INSTALL_MOD_DIR=updates \
    modules_install
sudo depmod
cd ..

# **Tip:** If the message "`Can't read private key`" appears, then the module could not be signed. This will not cause a problem unless the kernel enforces module signature verification.

3. Install the Modified Firmware

# Obtain the CSI Tool supplementary material:
git clone https://github.com/dhalperi/linux-80211n-csitool-supplementary.git

# Relocate any existing firmware for Intel Wi-Fi Link 5000 Series adapters:
for file in /lib/firmware/iwlwifi-5000-*.ucode; do sudo mv $file $file.orig; done

# Install the modified firmware:
sudo cp linux-80211n-csitool-supplementary/firmware/iwlwifi-5000-2.ucode.sigcomm2010 /lib/firmware/
sudo ln -s iwlwifi-5000-2.ucode.sigcomm2010 /lib/firmware/iwlwifi-5000-2.ucode

4. Build the Userspace Logging Tool

# Build *log_to_file*, a command line tool that writes CSI obtained via the driver to a file:
make -C linux-80211n-csitool-supplementary/netlink

5. Enable Logging and Test

# Unload the driver:
sudo modprobe -r iwlwifi mac80211

# *Tip:* The message "`FATAL: Module iwlwifi is in use.`" may appear if the `iwldvm` module needs to be explicitly unloaded first (on distributions other than Ubuntu). If so, use this instead:
sudo modprobe -r iwldvm iwlwifi mac80211

# Once the driver is unloaded, reload it with CSI logging enabled:
sudo modprobe iwlwifi connector_log=0x1

# Connect to an 802.11n access point, by using (for example) the *iw* and *iproute2* utilities (or if *NetworkManager* is enabled for the wireless interface, using *nm-cli* or the graphical applet). Alternatively, you can let your system function as an 802.11n access point by installing and configuring *hostapd* (see the supplementary material for configuration examples); in this case, start *hostapd* on this system and then connect another 802.11n station to it.

# Either way, once you are connected, begin logging CSI to a file:
sudo linux-80211n-csitool-supplementary/netlink/log_to_file csi.dat

# At a different terminal, run the *ping* command with the IP address of the connected access point (or connected station). If replies are sent back at High Throughput (802.11n) bitrates, *log_to_file* will write the CSI for each received packet to the file, and also print a message to the terminal. Note that depending on the rate selection algorithm, the first few packets are typically sent at Legacy (802.11a/b/g) bitrates instead of High Throughput bitrates; these will not provide CSI.

Make sure to see the FAQ for more details about collecting CSI.

Back to the main page

Usage

# connect wifi
sudo iw dev wlan0 connect orbi_a

# collect data
sudo ./k_linux-80211n-csitool-supplementary/netlink/log_to_file data.dat
0189 bb32 386f dc99 1100 0003 0220 2721
a827 0974 010c 09b8 77b0 d768 0880 e04f
48f0 3f80 c483 0546 807c 02fb 42fe 0203
30e4 3dfa eff9 e5cf fbed 29e8 d14f 6e51
8e3f b04d 90ef 9f9f 0ef0 7d79 ea00 85fb
94fd 0376 7fc0 6f2c e727 0c8c 5418 18d8
3340 8222 fc45 603f 84bd 203f e001 13fb
...

end

EOF
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