From: David S. Miller <davem@davemloft.net>
Date: Tue, 13 Dec 2011 21:48:21 +0000 (-0500)
Subject: ipv6: If neigh lookup fails during icmp6 dst allocation, propagate error.
X-Git-Tag: v3.3-rc1~182^2~222
X-Git-Url: http://git.openpandora.org/cgi-bin/gitweb.cgi?a=commitdiff_plain;h=b43faac69062f0fc75bd3230d67da64e184232d1;p=pandora-kernel.git

ipv6: If neigh lookup fails during icmp6 dst allocation, propagate error.

Don't just succeed with a route that has a NULL neighbour attached.
This follows the behavior of addrconf_dst_alloc().

Allowing this kind of route to end up with a NULL neigh attached will
result in packet drops on output until the route is somehow
invalidated, since nothing will meanwhile try to lookup the neigh
again.

A statistic is bumped for the case where we see a neigh-less route on
output, but the resulting packet drop is otherwise silent in nature,
and frankly it's a hard error for this to happen and ipv6 should do
what ipv4 does which is say something in the kernel logs.

Signed-off-by: David S. Miller <davem@davemloft.net>
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