From f10f7d2a8200fe33c5030c7e32df3a2b3561f3cd Mon Sep 17 00:00:00 2001
From: "D.S. Ljungmark" <ljungmark@modio.se>
Date: Wed, 25 Mar 2015 09:28:15 +0100
Subject: [PATCH] ipv6: Don't reduce hop limit for an interface

commit 6fd99094de2b83d1d4c8457f2c83483b2828e75a upstream.

A local route may have a lower hop_limit set than global routes do.

RFC 3756, Section 4.2.7, "Parameter Spoofing"

>   1.  The attacker includes a Current Hop Limit of one or another small
>       number which the attacker knows will cause legitimate packets to
>       be dropped before they reach their destination.

>   As an example, one possible approach to mitigate this threat is to
>   ignore very small hop limits.  The nodes could implement a
>   configurable minimum hop limit, and ignore attempts to set it below
>   said limit.

Signed-off-by: D.S. Ljungmark <ljungmark@modio.se>
Acked-by: Hannes Frederic Sowa <hannes@stressinduktion.org>
Signed-off-by: David S. Miller <davem@davemloft.net>
[bwh: Backported to 3.2: adjust ND_PRINTK() usage]
Signed-off-by: Ben Hutchings <ben@decadent.org.uk>
---
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