Added mac80211_hwsim - software simulator of 802.11 radio(s) for mac80211
mac80211_hwsim is a Linux kernel module that can be used to simulate arbitrary number of IEEE 802.11 radios for mac80211 on a single device. It can be used to test most of the mac80211 functionality and user space tools (e.g., hostapd and wpa_supplicant) in a way that matches very closely with the normal case of using real WLAN hardware. From the mac80211 view point, mac80211_hwsim is yet another hardware driver, i.e., no changes to mac80211 are needed to use this testing tool.
This commit is contained in:
Jouni Malinen
parent
3e2ad1b932
commit
de08c7248d
5 changed files with 436 additions and 0 deletions
12
mac80211_hwsim/Makefile
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12
mac80211_hwsim/Makefile
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# Determine path to the root directory of the Linux kernel source for the
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# currently running kernel. Version can be hardcoded with environment variable:
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# KVERS=2.6.25-foo make
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# Kernel path can be overrided with KERNEL_PATH argument to make:
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# make KERNEL_PATH=/usr/src/linux
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KVERS ?= $(shell uname -r)
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KERNEL_PATH ?= /lib/modules/$(KVERS)/build
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hwsim:
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$(MAKE) -C $(KERNEL_PATH) SUBDIRS=$(PWD) modules
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obj-m += mac80211_hwsim.o
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65
mac80211_hwsim/README
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65
mac80211_hwsim/README
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mac80211_hwsim - software simulator of 802.11 radio(s) for mac80211
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Copyright (c) 2008, Jouni Malinen <j@w1.fi>
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This program is free software; you can redistribute it and/or modify
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it under the terms of the GNU General Public License version 2 as
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published by the Free Software Foundation.
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Introduction
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mac80211_hwsim is a Linux kernel module that can be used to simulate
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arbitrary number of IEEE 802.11 radios for mac80211 on a single
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device. It can be used to test most of the mac80211 functionality and
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user space tools (e.g., hostapd and wpa_supplicant) in a way that
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matches very closely with the normal case of using real WLAN
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hardware. From the mac80211 view point, mac80211_hwsim is yet another
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hardware driver, i.e., no changes to mac80211 are needed to use this
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testing tool.
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The main goal for mac80211_hwsim is to make it easier for developers
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to test their code and work with new features to mac80211, hostapd,
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and wpa_supplicant. The simulated radios do not have the limitations
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of real hardware, so it is easy to generate an arbitrary test setup
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and always reproduce the same setup for future tests. In addition,
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since all radio operation is simulated, any channel can be used in
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tests regardless of regulatory rules.
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mac80211_hwsim kernel module has a parameter 'radios' that can be used
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to select how many radios are simulates (default 2). This allows
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configuration of both very simply setups (e.g., just a single access
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point and a station) or large scale tests (multiple access points with
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hundreds of stations).
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mac80211_hwsim works by tracking the current channel of each virtual
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radio and copying all transmitted frames to all other radios that are
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currently enabled and on the same channel as the transmitting
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radio. Software encryption in mac80211 is used so that the frames are
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actually encrypted over the virtual air interface to allow more
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complete testing of encryption.
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Simple example
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This example shows how to use mac80211_hwsim to simulate two radios:
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one to act as an access point and the other as a station that
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associates with the AP. hostapd and wpa_supplicant are used to take
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care of WPA2-PSK authentication. In addition, hostapd is also
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processing access point side of association.
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Please note that the currently released Linux kernel (2.6.25) does not
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enable AP mode, so a simple patch is needed to enable AP mode selection:
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http://johannes.sipsolutions.net/patches/kernel/all/LATEST/006-allow-ap-vlan-modes.patch
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# Build mac80211_hwsim:
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make
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# Load the module
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insmod ./mac80211_hwsim.ko
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# Run hostapd (AP) for wlan0
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hostapd hostapd.conf
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# Run wpa_supplicant (station) for wlan1
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wpa_supplicant -Dwext -iwlan1 -c wpa_supplicant.conf
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11
mac80211_hwsim/hostapd.conf
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11
mac80211_hwsim/hostapd.conf
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interface=wlan0
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driver=nl80211
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hw_mode=g
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channel=1
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ssid=mac80211 test
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wpa=2
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wpa_key_mgmt=WPA-PSK
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wpa_pairwise=CCMP
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wpa_passphrase=12345678
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338
mac80211_hwsim/mac80211_hwsim.c
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338
mac80211_hwsim/mac80211_hwsim.c
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/*
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* mac80211_hwsim - software simulator of 802.11 radio(s) for mac80211
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* Copyright (c) 2008, Jouni Malinen <j@w1.fi>
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*
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* This program is free software; you can redistribute it and/or modify
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* it under the terms of the GNU General Public License version 2 as
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* published by the Free Software Foundation.
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*/
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/*
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* TODO:
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* - periodic Beacon transmission in AP mode
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* - IBSS mode simulation (Beacon transmission with competion for "air time")
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* - IEEE 802.11a and 802.11n modes
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*/
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#include <net/mac80211.h>
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MODULE_AUTHOR("Jouni Malinen");
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MODULE_DESCRIPTION("Software simulator of 802.11 radio(s) for mac80211");
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MODULE_LICENSE("GPL");
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static int radios = 2;
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module_param(radios, int, 0444);
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MODULE_PARM_DESC(radios, "Number of simulated radios");
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static struct class *hwsim_class;
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static struct ieee80211_hw **hwsim_radios;
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static int hwsim_radio_count;
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static const struct ieee80211_channel hwsim_channels[] = {
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{ .chan = 1, .freq = 2412, .val = 1 },
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{ .chan = 2, .freq = 2417, .val = 2 },
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{ .chan = 3, .freq = 2422, .val = 3 },
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{ .chan = 4, .freq = 2427, .val = 4 },
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{ .chan = 5, .freq = 2432, .val = 5 },
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{ .chan = 6, .freq = 2437, .val = 6 },
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{ .chan = 7, .freq = 2442, .val = 7 },
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{ .chan = 8, .freq = 2447, .val = 8 },
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{ .chan = 9, .freq = 2452, .val = 9 },
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{ .chan = 10, .freq = 2457, .val = 10 },
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{ .chan = 11, .freq = 2462, .val = 11 },
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{ .chan = 12, .freq = 2467, .val = 12 },
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{ .chan = 13, .freq = 2472, .val = 13 },
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{ .chan = 14, .freq = 2484, .val = 14 },
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};
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static const struct ieee80211_rate hwsim_rates[] = {
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{ .rate = 10, .val = 10, .flags = IEEE80211_RATE_CCK },
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{ .rate = 20, .val = 20, .val2 = 21, .flags = IEEE80211_RATE_CCK_2 },
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{ .rate = 55, .val = 55, .val2 = 56, .flags = IEEE80211_RATE_CCK_2 },
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{ .rate = 110, .val = 110, .val2 = 111,
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.flags = IEEE80211_RATE_CCK_2 },
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{ .rate = 60, .val = 60, .flags = IEEE80211_RATE_OFDM },
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{ .rate = 90, .val = 90, .flags = IEEE80211_RATE_OFDM },
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{ .rate = 120, .val = 120, .flags = IEEE80211_RATE_OFDM },
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{ .rate = 180, .val = 180, .flags = IEEE80211_RATE_OFDM },
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{ .rate = 240, .val = 240, .flags = IEEE80211_RATE_OFDM },
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{ .rate = 360, .val = 360, .flags = IEEE80211_RATE_OFDM },
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{ .rate = 480, .val = 480, .flags = IEEE80211_RATE_OFDM },
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{ .rate = 540, .val = 540, .flags = IEEE80211_RATE_OFDM }
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};
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struct mac80211_hwsim_data {
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struct device *dev;
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struct ieee80211_hw_mode modes[1];
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struct ieee80211_channel channels[ARRAY_SIZE(hwsim_channels)];
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struct ieee80211_rate rates[ARRAY_SIZE(hwsim_rates)];
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int freq;
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int channel;
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enum ieee80211_phymode phymode;
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int radio_enabled;
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int beacon_int;
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unsigned int rx_filter;
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};
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static int mac80211_hwsim_tx(struct ieee80211_hw *hw, struct sk_buff *skb,
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struct ieee80211_tx_control *control)
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{
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struct mac80211_hwsim_data *data = hw->priv;
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struct ieee80211_tx_status tx_status;
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struct ieee80211_rx_status rx_status;
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int i;
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if (!data->radio_enabled) {
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printk(KERN_DEBUG "%s: dropped TX frame since radio "
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"disabled\n", wiphy_name(hw->wiphy));
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dev_kfree_skb(skb);
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return NETDEV_TX_OK;
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}
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memset(&rx_status, 0, sizeof(rx_status));
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/* TODO: set mactime */
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rx_status.freq = data->freq;
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rx_status.channel = data->channel;
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rx_status.phymode = data->phymode;
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rx_status.rate = control->tx_rate;
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/* TODO: simulate signal strength (and optional packet drop) */
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/* Copy skb to all enabled radios that are on the current frequency */
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for (i = 0; i < hwsim_radio_count; i++) {
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struct mac80211_hwsim_data *data2;
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struct sk_buff *nskb;
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if (hwsim_radios[i] == NULL || hwsim_radios[i] == hw)
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continue;
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data2 = hwsim_radios[i]->priv;
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if (!data2->radio_enabled || data->freq != data2->freq)
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continue;
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nskb = skb_copy(skb, GFP_KERNEL);
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if (nskb == NULL)
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continue;
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ieee80211_rx(hwsim_radios[i], nskb, &rx_status);
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}
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memset(&tx_status, 0, sizeof(tx_status));
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memcpy(&tx_status.control, control, sizeof(*control));
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/* TODO: proper ACK determination */
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tx_status.flags = IEEE80211_TX_STATUS_ACK;
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ieee80211_tx_status(hw, skb, &tx_status);
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return NETDEV_TX_OK;
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}
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static int mac80211_hwsim_start(struct ieee80211_hw *hw)
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{
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printk(KERN_DEBUG "%s:%s\n", wiphy_name(hw->wiphy), __func__);
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return 0;
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}
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static void mac80211_hwsim_stop(struct ieee80211_hw *hw)
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{
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printk(KERN_DEBUG "%s:%s\n", wiphy_name(hw->wiphy), __func__);
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}
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static int mac80211_hwsim_add_interface(struct ieee80211_hw *hw,
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struct ieee80211_if_init_conf *conf)
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{
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printk(KERN_DEBUG "%s:%s\n", wiphy_name(hw->wiphy), __func__);
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return 0;
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}
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static void mac80211_hwsim_remove_interface(
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struct ieee80211_hw *hw, struct ieee80211_if_init_conf *conf)
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{
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printk(KERN_DEBUG "%s:%s\n", wiphy_name(hw->wiphy), __func__);
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}
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static int mac80211_hwsim_config(struct ieee80211_hw *hw,
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struct ieee80211_conf *conf)
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{
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struct mac80211_hwsim_data *data = hw->priv;
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printk(KERN_DEBUG "%s:%s (freq=%d radio_enabled=%d beacon_int=%d)\n",
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wiphy_name(hw->wiphy), __func__,
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conf->freq, conf->radio_enabled, conf->beacon_int);
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data->freq = conf->freq;
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data->channel = conf->channel;
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data->phymode = conf->phymode;
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data->radio_enabled = conf->radio_enabled;
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data->beacon_int = conf->beacon_int;
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return 0;
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}
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static void mac80211_hwsim_configure_filter(struct ieee80211_hw *hw,
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unsigned int changed_flags,
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unsigned int *total_flags,
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int mc_count,
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struct dev_addr_list *mc_list)
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{
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struct mac80211_hwsim_data *data = hw->priv;
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printk(KERN_DEBUG "%s:%s\n", wiphy_name(hw->wiphy), __func__);
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data->rx_filter = 0;
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if (*total_flags & FIF_PROMISC_IN_BSS)
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data->rx_filter |= FIF_PROMISC_IN_BSS;
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if (*total_flags & FIF_ALLMULTI)
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data->rx_filter |= FIF_ALLMULTI;
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*total_flags = data->rx_filter;
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}
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static const struct ieee80211_ops mac80211_hwsim_ops =
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{
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.tx = mac80211_hwsim_tx,
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.start = mac80211_hwsim_start,
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.stop = mac80211_hwsim_stop,
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.add_interface = mac80211_hwsim_add_interface,
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.remove_interface = mac80211_hwsim_remove_interface,
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.config = mac80211_hwsim_config,
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.configure_filter = mac80211_hwsim_configure_filter,
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};
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static void mac80211_hwsim_free(void)
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{
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int i;
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for (i = 0; i < hwsim_radio_count; i++) {
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if (hwsim_radios[i]) {
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struct mac80211_hwsim_data *data;
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data = hwsim_radios[i]->priv;
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ieee80211_unregister_hw(hwsim_radios[i]);
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if (!IS_ERR(data->dev))
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device_unregister(data->dev);
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ieee80211_free_hw(hwsim_radios[i]);
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}
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}
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kfree(hwsim_radios);
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class_destroy(hwsim_class);
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}
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static struct device_driver mac80211_hwsim_driver = {
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.name = "mac80211_hwsim"
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};
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static int __init init_mac80211_hwsim(void)
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{
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int i, err = 0;
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u8 addr[ETH_ALEN];
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struct mac80211_hwsim_data *data;
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struct ieee80211_hw *hw;
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DECLARE_MAC_BUF(mac);
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if (radios < 1 || radios > 65535)
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return -EINVAL;
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hwsim_radio_count = radios;
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hwsim_radios = kcalloc(hwsim_radio_count,
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sizeof(struct ieee80211_hw *), GFP_KERNEL);
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if (hwsim_radios == NULL)
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return -ENOMEM;
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hwsim_class = class_create(THIS_MODULE, "mac80211_hwsim");
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if (IS_ERR(hwsim_class)) {
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kfree(hwsim_radios);
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return PTR_ERR(hwsim_class);
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}
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memset(addr, 0, ETH_ALEN);
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addr[0] = 0x02;
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for (i = 0; i < hwsim_radio_count; i++) {
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printk(KERN_DEBUG "mac80211_hwsim: Initializing radio %d\n",
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i);
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hw = ieee80211_alloc_hw(sizeof(*data), &mac80211_hwsim_ops);
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if (hw == NULL) {
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||||||
|
printk(KERN_DEBUG "mac80211_hwsim: ieee80211_alloc_hw "
|
||||||
|
"failed\n");
|
||||||
|
err = -ENOMEM;
|
||||||
|
goto failed;
|
||||||
|
}
|
||||||
|
hwsim_radios[i] = hw;
|
||||||
|
|
||||||
|
data = hw->priv;
|
||||||
|
data->dev = device_create(hwsim_class, NULL, 0, "hwsim%d", i);
|
||||||
|
if (IS_ERR(data->dev)) {
|
||||||
|
printk(KERN_DEBUG "mac80211_hwsim: device_create "
|
||||||
|
"failed (%ld)\n", PTR_ERR(data->dev));
|
||||||
|
err = -ENOMEM;
|
||||||
|
goto failed;
|
||||||
|
}
|
||||||
|
data->dev->driver = &mac80211_hwsim_driver;
|
||||||
|
dev_set_drvdata(data->dev, hw);
|
||||||
|
|
||||||
|
SET_IEEE80211_DEV(hw, data->dev);
|
||||||
|
addr[3] = i >> 8;
|
||||||
|
addr[4] = i;
|
||||||
|
SET_IEEE80211_PERM_ADDR(hw, addr);
|
||||||
|
|
||||||
|
hw->channel_change_time = 1;
|
||||||
|
hw->queues = 1;
|
||||||
|
|
||||||
|
memcpy(data->channels, hwsim_channels, sizeof(hwsim_channels));
|
||||||
|
memcpy(data->rates, hwsim_rates, sizeof(hwsim_rates));
|
||||||
|
data->modes[0].channels = data->channels;
|
||||||
|
data->modes[0].rates = data->rates;
|
||||||
|
data->modes[0].mode = MODE_IEEE80211G;
|
||||||
|
data->modes[0].num_channels = ARRAY_SIZE(hwsim_channels);
|
||||||
|
data->modes[0].num_rates = ARRAY_SIZE(hwsim_rates);
|
||||||
|
|
||||||
|
err = ieee80211_register_hwmode(hw, data->modes);
|
||||||
|
if (err < 0) {
|
||||||
|
printk(KERN_DEBUG "mac80211_hwsim: "
|
||||||
|
"ieee80211_register_hwmode failed (%d)\n", err);
|
||||||
|
goto failed;
|
||||||
|
}
|
||||||
|
|
||||||
|
err = ieee80211_register_hw(hw);
|
||||||
|
if (err < 0) {
|
||||||
|
printk(KERN_DEBUG "mac80211_hwsim: "
|
||||||
|
"ieee80211_register_hw failed (%d)\n", err);
|
||||||
|
goto failed;
|
||||||
|
}
|
||||||
|
|
||||||
|
printk(KERN_DEBUG "%s: hwaddr %s registered\n",
|
||||||
|
wiphy_name(hw->wiphy),
|
||||||
|
print_mac(mac, hw->wiphy->perm_addr));
|
||||||
|
}
|
||||||
|
|
||||||
|
return 0;
|
||||||
|
|
||||||
|
failed:
|
||||||
|
mac80211_hwsim_free();
|
||||||
|
return err;
|
||||||
|
}
|
||||||
|
|
||||||
|
|
||||||
|
static void __exit exit_mac80211_hwsim(void)
|
||||||
|
{
|
||||||
|
printk(KERN_DEBUG "mac80211_hwsim: unregister %d radios\n",
|
||||||
|
hwsim_radio_count);
|
||||||
|
|
||||||
|
mac80211_hwsim_free();
|
||||||
|
}
|
||||||
|
|
||||||
|
|
||||||
|
module_init(init_mac80211_hwsim);
|
||||||
|
module_exit(exit_mac80211_hwsim);
|
||||||
10
mac80211_hwsim/wpa_supplicant.conf
Normal file
10
mac80211_hwsim/wpa_supplicant.conf
Normal file
|
|
@ -0,0 +1,10 @@
|
||||||
|
ctrl_interface=/var/run/wpa_supplicant
|
||||||
|
|
||||||
|
network={
|
||||||
|
ssid="mac80211 test"
|
||||||
|
psk="12345678"
|
||||||
|
key_mgmt=WPA-PSK
|
||||||
|
proto=WPA2
|
||||||
|
pairwise=CCMP
|
||||||
|
group=CCMP
|
||||||
|
}
|
||||||
Loading…
Reference in a new issue