dissect_ip() and check for header length

[Petr Sumbera <Petr.Sumbera () Sun COM>]

Hi,

I'm evaluating the way how to add support into Wireshark for Solaris 
snoop files with IP tunnel links data.

The data are basically RAW IP so I wouldn't have to write new dissector.

But the problem is that stored packets for *outgoing* traffic doesn't 
contain "Header length" (it's zero as at layer where it was captured it 
wasn't filled, the same case is for "Header checksum").

dissect_ip() for such packets will report just:
"Header length: %u bytes (bogus, must be at least %u)".

So we can either lighten this condition in dissect_ip() and continue 
with the packet processing (e.g if length and check sum is zero).

Or I can create new dissector which will just add correct header length 
and pass it along to dissect_ip().

Thanks for any comments/suggestions.

Petr
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