Tom Judge wrote:
Hi,
I have just started experimenting with OpenLLDP and come across a
little bit of a nasty. When it opens the interface, it puts it into
PROMISC mode, which I don't really want to happen. Is there any way
to add the LLDP MAC address (01-80-C2-00-00-0E) to the interface mac
filter from user space, so that the interface does not have to be set
to PROMISC?
There *is* an API for this but it's not integrated into pcap or bpf; see
SIOCADDMULTI and SIOCDELMULTI. There are some issues with doing that
portably, Windows and Linux do things somewhat differently in this space.
Really we could do with a KPI for this so that the references are
properly refcounted. If you have other link layer multicast listeners
it's not guaranteed that the stack will correctly restore the hash
filters at the driver level if it has to enable ALLMULTI mode.
You almost certainly don't want to set PROMISC if you are ever going to
do any kind of IP forwarding, although I believe I fixed that historic
bug whereby the IP layer kept seeing its own packets about a year ago.
later
BMS
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