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FragAttacks: Fragmentation & Aggregation Attacks
87343c2017
These changes account for situations where the CQM threshold might be approximately the same as the currently received signal, and thus CQM events are triggered often due to measurement error/small fluctuations. This results in scanning occurring too frequently. Firstly, inhibit the immediate scan when the short-scan count is at the maximum. This keeps bursts of CQM toggling from causing a torrent of back-to-back scans. This does not inhibit immediate scans if the CQM triggers a second time (if the signal falls lower past the hysteresis). This reduces the scan rate in the worst case (fast-rate toggling high/low CQM events) to the short scan interval. Secondly, change the behavior of the short scan count so it acts like a "leaky bucket". As we perform short-scans, the bucket fills until it reaches a maximal short-scan count, at which we back-off and revert to a long scan interval. The short scan count decreases by one (emptying the bucket) every time we complete a long scan interval without a low-RSSI CQM event. This reduces the impact of medium-rate toggling of high/low CQM events, reducing the number of short-interval scans that occur before returning to a long-interval if the system was recently doing short scans. |
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| doc | ||
| eap_example | ||
| hostapd | ||
| mac80211_hwsim | ||
| patches | ||
| radius_example | ||
| src | ||
| tests | ||
| wlantest | ||
| wpa_supplicant | ||
| .gitignore | ||
| build_nsis.sh | ||
| build_release | ||
| CONTRIBUTIONS | ||
| COPYING | ||
| README | ||
wpa_supplicant and hostapd -------------------------- Copyright (c) 2002-2012, Jouni Malinen <j@w1.fi> and contributors All Rights Reserved. These programs are dual-licensed under both the GPL version 2 and BSD license (the one with advertisement clause removed). Either license may be used at your option. If you are submitting changes to the project, please see CONTRIBUTIONS file for more instructions. This package may include either wpa_supplicant, hostapd, or both. See README file respective subdirectories (wpa_supplicant/README or hostapd/README) for more details. Source code files were moved around in v0.6.x releases and compared to earlier releases, the programs are now built by first going to a subdirectory (wpa_supplicant or hostapd) and creating build configuration (.config) and running 'make' there (for Linux/BSD/cygwin builds). License ------- GPL v2: This program is free software; you can redistribute it and/or modify it under the terms of the GNU General Public License version 2 as published by the Free Software Foundation. This program is distributed in the hope that it will be useful, but WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License for more details. You should have received a copy of the GNU General Public License along with this program; if not, write to the Free Software Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA (this copy of the license is in COPYING file) Alternatively, this software may be distributed, used, and modified under the terms of BSD license: Redistribution and use in source and binary forms, with or without modification, are permitted provided that the following conditions are met: 1. Redistributions of source code must retain the above copyright notice, this list of conditions and the following disclaimer. 2. Redistributions in binary form must reproduce the above copyright notice, this list of conditions and the following disclaimer in the documentation and/or other materials provided with the distribution. 3. Neither the name(s) of the above-listed copyright holder(s) nor the names of its contributors may be used to endorse or promote products derived from this software without specific prior written permission. THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.