netdev - Re: [PATCH] ipv6: don't call addrconf_dst

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Message-ID: <20140102083200.GD22494@order.stressinduktion.org>
Date:	Thu, 2 Jan 2014 09:32:00 +0100
From:	Hannes Frederic Sowa <hannes@...essinduktion.org>
To:	chenweilong <chenweilong@...wei.com>
Cc:	netdev@...r.kernel.org
Subject: Re: [PATCH] ipv6: don't call addrconf_dst_alloc again when enable lo

On Thu, Jan 02, 2014 at 04:13:40PM +0800, chenweilong wrote:
> Can you give more explanation about this please?

If you look at the routing table for local addresses (ip -6 route list table
local), you see that every address which is RTF_LOCAL (and thus passes up the
packets via ip6_input) has as its device the loopback device.

In case you shutdown loopback you clear all those routes, thus incoming
packets won't find the corresponding rt6_info which directs the packets to
passed up the stack.

I guess it was done to satisfy the scoped architecture of IPv6.

Does this help you?

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