https://bugs.wireshark.org/bugzilla/show_bug.cgi?id=7337
Summary: EtherCAT dissector: datagram header interprets some
bits wrong
Product: Wireshark
Version: 1.6.7
Platform: x86-64
OS/Version: Ubuntu
Status: NEW
Severity: Major
Priority: Low
Component: Wireshark
AssignedTo: bugzilla-admin@xxxxxxxxxxxxx
ReportedBy: dachs@xxxxxxxxxxxxxxxxxxxxxxxxx
Created attachment 8562
--> https://bugs.wireshark.org/bugzilla/attachment.cgi?id=8562
capture of two ethercat packets with bug in order of circulating-bit and second
reserved-bit
Build Information:
wireshark 1.6.7
Copyright 1998-2012 Gerald Combs <gerald@xxxxxxxxxxxxx> and contributors.
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 GTK+ 2.24.10, with GLib 2.32.0, with libpcap (version
unknown), with libz 1.2.3.4, with POSIX capabilities (Linux), without libpcre,
with SMI 0.4.8, with c-ares 1.7.5, with Lua 5.1, without Python, with GnuTLS
2.12.14, with Gcrypt 1.5.0, with MIT Kerberos, with GeoIP, with PortAudio
V19-devel (built Dec 10 2011 11:43:10), without AirPcap.
Running on Linux 3.2.0-24-generic, with libpcap version 1.1.1, with libz
1.2.3.4, GnuTLS 2.12.14, Gcrypt 1.5.0.
Built using gcc 4.6.3.
--
According to the EtherCAT standard, the order of the fields in the datagram
header is defined in this way:
8bit CMD
8bit Index
32bit Address
11bit Length
2bit Reserved
1bit Circulating frame
1bit Reserved
1bit More frames following
16bit IRQ
The dissector interprets the order of the "circulating frame"-bit and the
second "reserved"-bit wrong:
EtherCAT datagram(s): 'LRW': Len: 100, Adp 0x0, Ado 0x1, Wc 2
EtherCAT datagram: Cmd: 'LRW' (12), Len: 100, Addr 0x10000, Cnt 2
Header
Command : Logical memory read write (0x0c)
Index : 0x39
Log Addr : 0x00010000
Length : 100 (0x64) - No Roundtrip - Last Sub Command
.... .000 0110 0100 = Length: 100
..00 0... .... .... = Reserved: Valid (0)
.0.. .... .... .... = Round trip: Frame is not circulating (0)
0... .... .... .... = Last indicator: Last EtherCAT datagram
(0)
Interrupt : 0x0000
Data : 000000000000000000000000000000000000000000000000...
Working Cnt: 2
(from http://wiki.wireshark.org/Protocols/ethercat, or see attachment from my
own capture )
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