On Nov 11, 2010, at 6:55 PM, Jon Zhou wrote:
> Does libpcap/tcpdump support "SKF_AD_QUEUE" instruction and BPF filter?
I presume you mean "does libpcap support generating the SKF_AD_QUEUE special
packet offset in BPF filter programs?" If so, the answer is "no"; there's
probably no reason why there couldn't be a keyword in the libpcap filter
language ("queue {N}" or something such as that) to support it, although, of
course, filters with that keyword would be rejected if either
1) you're trying to do a live capture on anything other than a Linux
PF_PACKET socket
or
2) you're trying to read a savefile.
pcap_compile() is, of course, not the only way to get a BPF program; a library
or application could, for example, generate the filter program by hand, which
wouldn't be too bad if you weren't trying to filter on arbitrary expressions.-
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