libnl3 ... missing feature for retrieving cached address objects?

[David Sommerseth]

Hi,

I'm doing some massive updates to python-ethtool, which uses libnl to
retrieve information about network and hardware configurations.  The use
of libnl-1 was added quite a long time ago to especially implement IPv6
support.  I'm now doing a lot of changes to improve the overall code and
simplify the implementation.

In this process, I found rtnl_addr_get() too specific, as I want to
retrieve the IP address for a specific link.  From what I could see,
rtnl_addr_get() will always filter based on the struct nl_address object
passed to it and match against the given address.  This is too strict
for my use case.  Further I couldn't find any other obvious solutions to
extract this information, except traversing all objects using
nl_cache_foreach_filter() and a callback function.

So I propose a new function - rtnl_addr_get_index() (patch attached)
which is a simplified rtnl_addr_get() function.  On my slight testing,
this seems to work quite well.

However, I'm not sure if I'm overlooking something here?  Or is there a
better or simpler approach?


--
kind regards,

David Sommerseth
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