On Mon, Aug 1, 2016 at 8:50 AM, Christoph Hellwig [off-list ref] wrote:

It'd still need all the scope ID handling similar to what Roland did,
and that's a fair chunk of code.  We have a few options to handle the
different allowed addresses:

 (1) v4/v6 only flags
 (2) having low-level v4/v6 handlers and one that tries these both
 (3) using the try both handler and rejecting the wrong one after
     parsing.

(3) seems easiest, but (2) sounds fine to me.  But I'd really like to
hear from folks on the netdev list what they think of that idea first.

I think adding a new helper that parses both v4 and v6 addresses +
scope ID seems like the best thing for now.  I did a grep for in6_pton
and it looks like at least fs/cifs/netmisc.c and net/sunrpc/addr.c
could use the helper.

What do you think of adding inet_pton_with_scope() to
net/core/utils.c?  I'm open to better ideas on the name.  But I can
code that up and use it in nvme, as well as convert over the two
places I mentioned above.  The first parameter of the function can be
an af, and the caller can pass in AF_UNSPEC, AF_INET, or AF_INET6 to
restrict the parsing to one type of address (or not).

 - R.
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