http://bugs.wireshark.org/bugzilla/show_bug.cgi?id=2580
Summary: invalid checksum in udp header
Product: Wireshark
Version: 1.0.0
Platform: PC
OS/Version: other
Status: NEW
Severity: Major
Priority: Low
Component: Wireshark
AssignedTo: wireshark-bugs@xxxxxxxxxxxxx
ReportedBy: rtrout@xxxxxxxxxxxxxxxxx
Build Information:
Paste the COMPLETE build information from "Help->About Wireshark", "wireshark
-v", or "tshark -v".
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I send the following packet:
{0x00, 0x16, 0x41, 0xE0, 0xF8, 0x59,//00:target ethernet address
0x00, 0x50, 0xC2, 0x44, 0x20, 0x05,//06:source ethernet address
0x08, 0x00, //0C:packet type
//IP, header
0x45, 0x00, //00:
0x00, 48, //02:total length(IP + udp + userData)
0x00, 0x00, //04:identification
0x40, 0x00, //06:flags,fragment offset
0x40, //08:TTL
0x11, //09:protocol
0x25, 0xE2, //10:IP checksum (computed)
0x0A, 0x00, 0x00, 0x45, //12:source IP 10.0.0.69
0x0A, 0x00, 0x00, 0x97, //16:destination IP 10.0.0.151
//UDP packet
0x03, 0xE8, //20:source port=1000
0x0B, 0xCC, //22:destn port=0xBCC
0x00, 26, //24:UDP length
0x0F, 0xC7, //26:UDP checksum (computed)
//data //28:
'M', 'S', 'G', '=', 'U', 'D', 'P', ' ', //28-35
'M', 'e', 's', 's', 'a', 'g', 'e', '.', //36-43
0x0A, 0, 0, 0, //44-47
};
Wire shark reports an invalid UDP checksum and suggests 0x0FC5.
I believe the checksum is correct since the packet gets through Windows sockets
just fine (and other packets with checksum errors do not).
If i change the checksum to 0x0FC5 it does not get through Windows.
Program is running on an embedded system with no operating system or IP stack.
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