From c382bb9d32a55029fb13b118858e25908fab4617 Mon Sep 17 00:00:00 2001
From: YOSHIFUJI Hideaki <yoshfuji@linux-ipv6.org>
Date: Tue, 10 Jul 2007 22:47:58 -0700
Subject: [PATCH] [IPV6]: Restore semantics of Routing Header processing.

The "fix" for emerging security threat was overkill and it broke
basic semantic of IPv6 routing header processing.  We should assume
RT0 (or even RT2, depends on configuration) as "unknown" RH type so
that we
- silently ignore the routing header if segleft == 0
- send ICMPv6 Parameter Problem message back to the sender,
  otherwise.

Signed-off-by: YOSHIFUJI Hideaki <yoshfuji@linux-ipv6.org>
Signed-off-by: David S. Miller <davem@davemloft.net>
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