Wireshark-bugs: [Wireshark-bugs] [Bug 10786] New: VHT NDP announcement frame's STA info field an
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From: bugzilla-daemon@xxxxxxxxxxxxx
Date: Thu, 18 Dec 2014 01:01:12 +0000
Bug ID 10786
Summary VHT NDP announcement frame's STA info field and FCS is not correctly
Product Wireshark
Version 1.99.x (Experimental)
Hardware x86-64
OS Windows 7
Status UNCONFIRMED
Severity Major
Priority Low
Component Dissection engine (libwireshark)
Assignee bugzilla-admin@wireshark.org
Reporter sudheer.konda@gmail.com 

Build Information:
Wireshark 1.99.1 (v1.99.1-0-g4c229ca from master)

Copyright 1998-2014 Gerald Combs <gerald@wireshark.org> and contributors.
License GPLv2+: GNU GPL version 2 or later
<http://www.gnu.org/licenses/old-licenses/gpl-2.0.html>
This is free software; see the source for copying conditions. There is NO
warranty; not even for MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.

Compiled (64-bit) with Qt 5.3.1, with WinPcap (4_1_3), with libz 1.2.5, with
GLib 2.42.0, with SMI 0.4.8, with c-ares 1.9.1, with Lua 5.2, with GnuTLS
3.2.15, with Gcrypt 1.6.2, with MIT Kerberos, with GeoIP, without PortAudio,
with AirPcap.

Running on 64-bit Windows 7 Service Pack 1, build 7601, with WinPcap version
4.1.3 (packet.dll version 4.1.0.2980), based on libpcap version 1.0 branch
1_0_rel0b (20091008), with GnuTLS 3.2.15, with Gcrypt 1.6.2, without AirPcap.
        Intel(R) Core(TM) i7-3770 CPU @ 3.40GHz (with SSE4.2), with 16328MB of
physical memory.


Built using Microsoft Visual C++ 12.0 build 30501

--
In the VHT NDP announcement frame, the 3 bits of STA info filed for Nc index
shows as Reserved.

Also the FCS at the end of the frame is decoded as additional STA info fields
which does not seem correct.

IEEE 802.11 VHT NDP Announcement, Flags: ........C
    Type/Subtype: VHT NDP Announcement (0x0015)
    Frame Control Field: 0x5400
    .000 0000 0110 0100 = Duration: 100 microseconds
    Receiver address: MurataMa_d6:55:65 (10:a5:d0:d6:55:65)
    Transmitter address: Netgear_97:fb:5f (e8:fc:af:97:fb:5f)
    Sounding Dialog Token: 0xa8
    STA Info: 0x0000
        .... 0000 0000 0000 = AID12: 0x0000
        ...0 .... .... .... = Feedback Type: SU feedback requested
        000. .... .... .... = Reserved: 0x0000
    STA Info: 0xa4ec
        .... 0100 1110 1100 = AID12: 0x04ec
        ...0 .... .... .... = Feedback Type: SU feedback requested
        101. .... .... .... = Reserved: 0x0005
    STA Info: 0x1c24
        .... 1100 0010 0100 = AID12: 0x0c24
        ...1 .... .... .... = Feedback Type: MU feedback requested
        001. .... .... .... = Nc Index: 2 (1)
    Frame check sequence: 0x241ceca4 [correct]

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