Re: pcap_inject and 802.1q subinterfaces on Solaris?

[Guy Harris <guy () alum mit edu>]

On May 19, 2011, at 3:33 PM, Tim Sammut wrote:

> I have a small tool that uses pcap_inject to send ethernet frames on
> specific host interfaces. When injecting on a 802.1q virtual interface
> on Solaris the frame is ultimately transmitted without the 802.1q header
> that should have been add by the host OS. This is Solaris 10 on SPARC
> with libpcap 1.1.1, and the same scenario works perfectly on Linux.
>
> Is this something that should work on Solaris too?

Ultimately, libpcap depends on the OS to provide raw packet capture and injection capabilities.  If the Solaris 
networking stack allows a DLPI device bound to a VLAN interface to have packets handed to it with a full Ethernet 
header and to use the Ethernet header but add in the appropriate VLAN header, by doing, for example, a special ioctl - 
and either that ioctl is harmless on other interfaces or libpcap can somehow determine whether it needs to make that 
ioctl - then libpcap could (and should) be changed to do that.  If the Solaris networking stack doesn't allow that, 
you're out of luck - you might have to open the hardware interface, construct the packets complete with VLAN header, 
and send the packets out on that.

I don't know which of those is the case; a quick look at the Sun^WOracle documentation didn't find anything obvious.
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