netdev - RTM_DELROUTE on interface going down

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Message-ID: <20131217110512.GA11216@unicorn.suse.cz>
Date:	Tue, 17 Dec 2013 12:05:12 +0100
From:	Michal Kubecek <mkubecek@...e.cz>
To:	netdev@...r.kernel.org
Subject: RTM_DELROUTE on interface going down - when to send?

Hello,

one of our customers noticed that when an interface is switched down, no
RTM_DELROUTE message is sent for IPv4 routes being deleted (but there
are RTM_NEWROUTE messages when the interface is switched up). This is
because rather than deleting the routes with fib_table_delete(), they
are flagged with RTNH_F_DEAD in fib_sync_down_dev() and then deleted in
trie_flush_list().

Before I start with the patch, I would like to ask: would it be more
appropriate to send the message when the route is marked as dead or when
it is actually deleted from the trie?

                                                          Michal Kubecek

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