for outdated information check Wireless Overview Archive
Linux Wireless is the source for documentation regarding the entire Linux Kernel IEEE 802.11 ("wireless") subsystem. It is a wiki like this one, so feel free to contribute there as well! Everything not OpenWrt specific, belongs there. This page is an exception, as I believe I can provide a better introduction.
wifi(note that Wi-Fi is a brand name)
broadcom-wl), broadcom mac80211-based drivers (the
b43) and the brcmSmac- and brcmFmac drivers
See what the Linux 802.11 driver for your hardware can and cannot do. Some drivers support only one mode: STA (also called station, client or managed mode) other drivers support multiple modes, some even simultaneously (interface combination):
Limitations when combining multiple wireless modes of operation at the same time do exist.
Firmware Limitations do exist
Available Frequencies, Bands and Channels are subject to regulation in each state. Please see: http://git.kernel.org/cgit/linux/kernel/git/wireless/wireless-regdb.git/tree/db.txt
Wireless drivers are pulled on a more or less regularly basis from wireless-testing and the OpenWrt-patches which are not mainlined yet are adjusted, see e.g. r36939. OpenWrt does not use Kernel drivers. The package is called mac80211.
Similar work (brand new drivers for older Kernel) is done by the backports project April 2013 announcement, previously called compat-wireless or compat-driver. OpenWrt does not use this, despite referencing it by name.
| ||Layer 3||https://github.com/nodogsplash/nodogsplash|
| NoDogSplash offers a simple way to open a free hotspot providing restricted access to an internet connection.
It is another alternative from NoCat which aims to offer captive portal solutions local to the router/gateway and a simplistic setup, user bandwidth control and basic auth/splash page. Nodogsplash is small, well tested, tailored for OpenWrt by its author and can be set up with only one or two config file changes, in contrast Chilli is more complete but complex to set up.
| ||Layer 2 / Layer 3||http://www.coova.org/|
| CoovaChilli is an open source access controller for wireless LAN access points and is based on ChilliSpot. It is used for authenticating users of a wireless (or wired) LAN. It supports web based login (UAM) which is today's standard for public HotSpots and it supports Wireless Protected Access (WPA) which is the standard of the future. Authentication, authorization and accounting (AAA) is handled by your favorite RADIUS server.
Built on top of Chillispot with several improvements and additions. Includes WISPr support, and much more. Main captive portal solution used in CoovaAP.
This shall be, but is not, an exhaustive list of all packages in the OpenWrt repository regarding wireless stuff to play with. The installation is always the same
opkg install <package>, for documentation regarding the configuration and utilization, search for Howtos in this wiki or in the Internet.
|airpwn||23618||Airpwn is a framework for 802.11 (wireless) packet injection. Airpwn listens to incoming wireless packets, and if the data matches a pattern specified in the config files, custom content is injected "spoofed" from the wireless access point. From the perspective of the wireless client, airpwn becomes the server.|
|collectd-mod-wireless||7321||wireless status input plugin|
|freifunk-watchdog||9546||A watchdog daemon that monitors wireless interfaces to ensure the correct BSSID and channel. The process will initiate a wireless restart as soon as it detects a BSSID or channel mismatch.|
|karma||8605||KARMA is a set of tools for assessing the security of wireless clients at multiple layers. Wireless sniffing tools discover clients and their preferred/trusted networks by passively listening for 802.11 Probe Request frames.|
|kmod-wprobe||9408||A module that exports measurement data from wireless driver to user space|
|mdk3||49495||Tool to exploit wireless vulnerabilities|
|wavemon||32209||wavemon is a ncurses-based monitoring application for wireless network devices. Based on WEXT-API|
|wireless-tools||30236||This package contains a collection of tools for configuring wireless adapters implementing WEXT-API|
|Overall size = 486.450 Bytes|
|Overall size = 308.902 Bytes|
|Overall size = 561.201 Bytes|
|kmod-ath9k||155.684||This module adds support for wireless adapters based on Atheros IEEE 802.11n AR5008 and AR9001 family of chipsets.|
|kmod-ath9k-htc||113.441||This module adds support for wireless adapters based on Atheros USB AR9271 and AR7010 family of chipsets.|
|kmod-ath9k-common||104.136||Atheros 802.11n wireless devices (common code for ath9k and ath9k_htc)|
|kmod-ath5k||82.272||This module adds support for wireless adapters based on Atheros 5xxx chipset.|
|kmod-ath||10.059||This module contains some common parts needed by Atheros Wireless drivers.|
|kmod-b43||210.860||Kernel module for Broadcom 43xx wireless support (mac80211 stack)|
|kmod-mac80211||139.372||Generic IEEE 802.11 Networking Stack (mac80211)|
|kmod-cfg80211||93.696||cfg80211 is the Linux wireless LAN (802.11) configuration API.|
|iw||32.100||cfg80211 interface configuration utility|
|crda||9.627|| The Central Regulatory Domain Agent serves one purpose: tell Linux kernel what to enforce. In essence it is a udev helper for communication between the kernel and userspace. You only need to run this manually for debugging purposes. For manual changing of regulatory domains use iw (
|libnl-tiny||13.529||This package contains a stripped down version of libnl|
| Due to r31954 tweaking the
iptables -t filter -I forward 1 -i br1 -m state --state NEW -j ACCEPT iptables -t filter -I forward 2 -i br1 -o br0 -m state --state NEW -j DROP iptables -t filter -I forward 3 -i br0 -o br1 -m state --state NEW -j DROP
You can find a couple of probed scenarios under →Howto.