netdev - netlink NLM_F_DUMP for unsupported address family / PF

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Message-ID: <20121227171917.07419887@vostro>
Date:	Thu, 27 Dec 2012 17:19:17 +0200
From:	Timo Teras <timo.teras@....fi>
To:	netdev@...r.kernel.org
Subject: netlink NLM_F_DUMP for unsupported address family / PF_UNSPEC

It seems that currently PF_UNSPEC is overloaded when dumping rtnetlink
things. It is used for two purposes: as wildcard entry to dump
all protocol families, and as fallback for unsupported families.

On my system with IPv[46] only and no IPX, running "ip -f ipx
route" would print the IPv4 and IPv6 routes instead of "unsupported" or
"not implemented" error which is rather confusing and unexpected.

Just removing the fallback from rtnl_get_dumpit() does not sound right
since some commands seem to rely on this behaviour e.g. RTM_GETQDISC.

Perhaps rtnl_dump_all should check that request family truly was
PF_UNSPEC or error out if not?

- Timo
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