mirror of
https://git.kernel.org/pub/scm/network/wireless/iwd.git
synced 2024-11-18 01:59:31 +01:00
The iNet Wireless Daemon (iwd) project aims to provide a comprehensive Wi-Fi connectivity solution for Linux based devices. The core goal of the project is to optimize resource utilization: storage, runtime memory and link-time costs.
https://iwd.wiki.kernel.org/
e9e9358898
Use the NLMSG_ALIGN macro on the family header size (struct ifinfomsg in this case). The ascii graphics in include/net/netlink.h show that both the netlink header and the family header should be padded. The netlink header (nlmsghdr) is already padded in ell. To "document" this requirementin ell what we could do is take two buffers, one for the family header and one for the attributes. This doesn't change anything for most people because ifinfomsg is already 16-byte long on the usual architectures. |
||
|---|---|---|
| autotests | ||
| client | ||
| doc | ||
| linux | ||
| monitor | ||
| src | ||
| test | ||
| tools | ||
| unit | ||
| .gitignore | ||
| acinclude.m4 | ||
| AUTHORS | ||
| bootstrap | ||
| bootstrap-configure | ||
| ChangeLog | ||
| configure.ac | ||
| COPYING | ||
| HACKING | ||
| INSTALL | ||
| Makefile.am | ||
| README | ||
| TODO | ||
Wireless daemon for Linux ************************* Copyright (C) 2013-2014 Intel Corporation. All rights reserved. Compilation and installation ============================ In order to compile the source code you need following software packages: - GCC compiler - GNU C library - Embedded Linux library To configure run: ./configure --prefix=/usr Configure automatically searches for all required components and packages. To compile and install run: make && make install Embedded Linux library ====================== In order to compile the daemon and control utility the development version of Embedded Linux library is required to be present. The development repositories can be found here: git://git.kernel.org/pub/scm/libs/ell/ell.git https://kernel.googlesource.com/pub/scm/libs/ell/ell.git The build systems requires that the Embedded Linux library source code is available on the same top level directory as the Wireless daemon source code: . |--- ell | |--- ell | `--- unit `--- iwd |--- src `--- client It is not required to build or install Embedded Linux library. The build will happen when building the Wireless daemon and it will then be linked internally. Netlink monitoring ================== The included iwmon utility can be used to monitor the 802.11 subsystem generic netlink commands and events. It uses the nlmon kernel driver from Linux 3.10 and later. On startup network monitor interface named named 'nlmon' is created unless another interface name is given on the command line. If the monitor interface was created by the iwmon utility, it will be removed on program exit. Manually the monitor interface can be created using the following commands: ip link add name nlmon type nlmon ip link set dev nlmon allmulticast on ip link set dev nlmon up It is possible to create netlink traces in PCAP format using tcpdump and then read them via iwmon utility: tcpdump -i nlmon -w trace-file.pcap The resulting PCAP files will use Linux cooked packet format containing packets with ARPHRD_NETLINK type. They can be read using iwmon: iwmon -r trace-file.pcap At this time iwmon is not able to write PCAP files by itself. This might change in future versions. When also the authentication protocol traffic on port 0x888e (ETH_P_PAE) is needed, then a second capture is required: tcpdump -i any 'ether proto 0x888e' -w trace-pae.pcap It is possible to combine these two PCAP files using the mergecap utility and create a combined trace file: mergecap -F pcap -w trace.pcap trace-file.pcap trace-pae.pcap This will create a trace.pcap file that includes the complete picture of nl80211 netlink traffic and authentication messages. All packets are merged in chronological order based on timestamps. Unfortunately it is not possible to instruct tcpdump filtering to do this in a single capture. Post-processing of the PCAP files is required at the moment. Simulating devices ================== The Linux driver mac80211_hwsim provides the functionality to simulate Wireless devices using fake virtual air. Just load the module. modprobe mac80211_hwsim radios=0 Provding the radios=0 is important since otherwise it starts out with two new Wireless radios by default. With the provided hwsim utility it is now possible to add and remove virtual radio devices. hwsim --create hwsim --destroy=<radio-id> The radio id assigned to each virtual device is its internal id used by the Wireless device.