Wireshark · Wireshark-bugs: [Wireshark-bugs] [Bug 12635] New: MPTCP: MP_JOIN 'B' bit not decoded correctly

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Bug ID	12635
Summary	MPTCP: MP_JOIN 'B' bit not decoded correctly
Product	Wireshark
Version	2.0.4
Hardware	x86-64
OS	Windows 7
Status	UNCONFIRMED
Severity	Normal
Priority	Low
Component	Dissection engine (libwireshark)
Assignee	bugzilla-admin@wireshark.org
Reporter	peszilagyi@gmail.com

Created attachment 14745 [details]
Two packets, MPTCP SYN and SYN+ACK, both with MP_JOIN and 'B' bit decoded
incorrectly.

Build Information:
Wireshark 2.0.4 (v2.0.4-0-gdd7746e from master-2.0)

Copyright 1998-2016 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 5.3.2, with WinPcap (4_1_3), with libz 1.2.8, with
GLib 2.42.0, with SMI 0.4.8, with c-ares 1.11.0, with Lua 5.2, with GnuTLS
3.2.15, with Gcrypt 1.6.2, with MIT Kerberos, with GeoIP, with QtMultimedia,
with AirPcap.

Running on 64-bit Windows 7 Service Pack 1, build 7601, with locale C, 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) i7-3720QM CPU @ 2.60GHz (with SSE4.2), with 24508MB of
physical memory.


Built using Microsoft Visual C++ 12.0 build 40629
--
Referring to RFC 6824 section 3.2, when MPTCP establishes a new sub-flow, it
indicates its priority (regular/backup) in a bit called 'B'. In Wireshark, the
'B' bit is not decoded correctly: when it is sent as zero in the packet header,
it is shown as 1 (being set).

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