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279 lines
8.1 KiB
Plaintext
279 lines
8.1 KiB
Plaintext
Wireless daemon for Linux
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*************************
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Copyright (C) 2013-2019 Intel Corporation. All rights reserved.
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Compilation and installation
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============================
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In order to compile the source code you need following software packages:
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- GCC compiler
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- GNU C library
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- Embedded Linux library
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- readline (command line client)
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To configure run:
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./configure --prefix=/usr
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Configure automatically searches for all required components and packages.
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To compile and install run:
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make && make install
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Embedded Linux library
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======================
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In order to compile the daemon and control utility the development version
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of Embedded Linux library is required to be present. The development
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repositories can be found here:
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git://git.kernel.org/pub/scm/libs/ell/ell.git
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https://kernel.googlesource.com/pub/scm/libs/ell/ell.git
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The build systems requires that the Embedded Linux library source code
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is available on the same top level directory as the Wireless daemon
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source code:
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.
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|--- ell
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| |--- ell
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| `--- unit
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`--- iwd
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|--- src
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`--- client
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It is not required to build or install Embedded Linux library. The build
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will happen when building the Wireless daemon and it will then be linked
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internally.
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When using --enable-external-ell build option, it is not required that the
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Embedded Linux library source code is available in the top level directory.
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The tarballs include a copy of the Embedded Linux library source files. When
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building from the tarballs, then it is not required to have the library
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sources available in the top level directory.
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Manual pages
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============
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The manual pages are generated from reStructuredText markup source files
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during the normal build process. The generation requires the rst2man utility
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from Python Docutils project. If rst2man is for some reason not available,
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using --disable-manual-pages will skip the manual pages generation and
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installation.
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When building from the tarballs, a copy of the generated manual pages is
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included and the rst2man utility is actually not needed.
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Configuration and options
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=========================
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The configuration system provides switches to disable certain build time
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configuration options which are generally useful and enabled by default:
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--disable-daemon
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Disable installation of Wireless daemon
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By default the Wireless daemon binary iwd is enabled and
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placed into --libexecdir directory.
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--disable-client
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Disable installation of Wireless client utility
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By default the Wireless client binary iwctl is enabled
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and place into --bindir directory.
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--disable-monitor
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Disable installation of Wireless monitor utility
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By default the Wireless monitor binary iwmon is enabled
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and place into --bindir directory.
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--disable-dbus-policy
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Disable installation of D-Bus system policy configuration
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By default the accompanying D-Bus policy file will be
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installed in the D-Bus data directory. The location of
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that directory will be automatically detected or can be
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manually configured via the --with-dbus-datadir option.
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The D-Bus policy is required for daemons to gain service
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name ownership and clients to access them. When disabling
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this option, manual installation of D-Bus polices is
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required.
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Note: This option affects all D-Bus policy configurations.
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--disable-systemd-service
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Disable installation of systemd service configuration
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By default the accompanying systemd service unit with
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D-Bus autostart configuration will be installed. The
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locations will be automatically detected or can be
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manually configured via --with-dbus-busdir option
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and --with-systemd-unitdir option.
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Using systemd is optional, but highly recommended. When
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disabling this option, manual installation is required.
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Note: This option affects all systemd unit setups.
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--disable-manual-pages
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Disable generation and installation of manual pages
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By default all available manual pages will be generated
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and installed. When disabling this options, no manual
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pages are installed.
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Note: This options affects all manual pages.
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When building for a system that wants to use wireless technology, disabling
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any of the above options makes only limited sense. It may break the general
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setup and usability for wireless connections.
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The configuration system provides switches for optional build time features
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that can be enabled if the functionality is required:
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--enable-external-ell
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Enable usage of external Embedded Linux library
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This allows using an externally installed Embedded Linux
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library instead of using the internal copy of ELL.
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Since the public API of Embedded Linux library is not yet
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stable, the usage of the internal ELL copy is preferred.
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--enable-wired
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Enable installation of Ethernet authentication daemon
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This allows enabling the Ethernet daemon binary ead which
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is then placed into --libexecdir directory.
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With this option the support for 802.1x for wired Ethernet
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connections can be enabled. It provides its own D-Bus
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policy and systemd configuration.
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--enable-hwsim
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Enable installation of Wireless simulation utility
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This allows enabling the Simulation daemon binary hwsim
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which is then placed into --bindir directory.
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With this utility and mac80211_hwim kernel module the
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simulation of 802.11 networks can be tested. It provides
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its own D-Bus policy configuration.
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This utility is only useful for developers and should not
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be considered for general installation. For this reason
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no systemd configuration is provided.
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--enable-tools
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Enable compilation of various testing utilities
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This enables building of all utilities that are however
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not installed and only useful during development.
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--enable-ofono
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Enable support for oFono SIM authentication
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Note: With --disable-daemon this option is ignored
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Netlink monitoring
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==================
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The included iwmon utility can be used to monitor the 802.11 subsystem
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generic netlink commands and events. It uses the nlmon kernel driver
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from Linux 3.10 and later. On startup network monitor interface named
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named 'nlmon' is created unless another interface name is given on the
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command line. If the monitor interface was created by the iwmon utility,
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it will be removed on program exit.
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Manually the monitor interface can be created using the following
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commands:
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ip link add name nlmon type nlmon
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ip link set dev nlmon allmulticast on
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ip link set dev nlmon up
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It is possible to create netlink traces in PCAP format using tcpdump
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and then read them via iwmon utility:
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tcpdump -i nlmon -w trace-file.pcap
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The resulting PCAP files will use Linux cooked packet format containing
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packets with ARPHRD_NETLINK type. They can be read using iwmon:
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iwmon -r trace-file.pcap
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At this time iwmon is not able to write PCAP files by itself. This might
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change in future versions.
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When also the authentication protocol traffic on port 0x888e (ETH_P_PAE)
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is needed, then a second capture is required:
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tcpdump -i any 'ether proto 0x888e' -w trace-pae.pcap
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It is possible to combine these two PCAP files using the mergecap utility
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and create a combined trace file:
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mergecap -F pcap -w trace.pcap trace-file.pcap trace-pae.pcap
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This will create a trace.pcap file that includes the complete picture
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of nl80211 netlink traffic and authentication messages. All packets are
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merged in chronological order based on timestamps.
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Unfortunately it is not possible to instruct tcpdump filtering to do
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this in a single capture. Post-processing of the PCAP files is required
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at the moment.
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Simulating devices
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==================
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The Linux driver mac80211_hwsim provides the functionality to simulate
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Wireless devices using fake virtual air. Just load the module.
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modprobe mac80211_hwsim radios=0
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Providing the radios=0 is important since otherwise it starts out with
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two new Wireless radios by default.
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With the provided hwsim utility it is now possible to add and remove
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virtual radio devices.
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hwsim --create --keep
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hwsim --destroy=<radio-id>
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The radio id assigned to each virtual device is its internal id used
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by the Wireless device.
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Information
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===========
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Mailing list:
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https://lists.linux.dev/
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https://lore.kernel.org/iwd/
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IRC:
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irc://irc.oftc.net/#iwd
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Wiki:
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https://iwd.wiki.kernel.org/
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