Re: pcap_inject and 802.1q subinterfaces on Solaris?

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

On May 19, 2011, at 7:43 PM, Guy Harris wrote:

> 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.

Or, if it can get enough information to synthesize the 802.1q header, libpcap could work around it by copying the 
packet to a private buffer, adding the 802.1q header, and handing that to the DLPI device.
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