netdev - BUG - routes not correctly deleted when address is deleted

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Message-ID: <20101130165539.40ce02c1@nehalam>
Date:	Tue, 30 Nov 2010 16:55:39 -0800
From:	Stephen Hemminger <shemminger@...tta.com>
To:	David Miller <davem@...emloft.net>
Cc:	netdev@...r.kernel.org
Subject: BUG - routes not correctly deleted when address is deleted

If multiple addresses are assigned to an interface, and
a route is created that uses that address.  The route is not
deleted when the address is deleted.  Linux does cleanup properly
when the last address is deleted; it seems the FIB lacks the callback
to cleanup routes referencing an address.

Simple example:

# modprobe dummy
# ip li set dev dummy0 up
# ip addr add 192.168.74.160/24 dev dummy0
# ip addr add 192.168.18.11/24 dev dummy0
# ip ro add 74.11.49.0/24 via 192.168.74.160

# ip addr del 192.168.74.160/24 dev dummy0
# ip ro show dev dummy0
74.11.49.0/24 via 192.168.74.160 
192.168.18.0/24  proto kernel  scope link  src 192.168.18.11 

Before I go off and either brute force it (add another call back
into fib_hash and fib_trie), is there a better way?

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