netdev - Re: [PATCH net-2.6.22] [IPV6] FIB6RULE: Find source address during looking up route.

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Date:	Wed, 28 Mar 2007 12:49:40 +0900 (JST)
From:	YOSHIFUJI Hideaki / 吉藤英明 
	<yoshfuji@...ux-ipv6.org>
To:	tgraf@...g.ch
Cc:	davem@...emloft.net, takamiya@...ntts.co.jp,
	netdev@...r.kernel.org, yoshfuji@...ux-ipv6.org
Subject: Re: [PATCH net-2.6.22] [IPV6] FIB6RULE: Find source address during
 looking up route.

In article <20070327142519.GN521@...tel.suug.ch> (at Tue, 27 Mar 2007 16:25:19 +0200), Thomas Graf <tgraf@...g.ch> says:

> * YOSHIFUJI Hideaki / ?$B5HF#1QL@ <yoshfuji@...ux-ipv6.org> 2007-03-27 22:45
> > When looking up route for destination with rules with
> > source address restrictions, we may need to find a source
> > address for the traffic if not given.
> 
> Out of curiosity, what sort of rules would have this flag set?
> The majority of lookups don't provide a valid source address.
> This new address search could become very expensive, because
> none of the results are cached.

This flags is used for Mobile IPv6.

Well, for non-connected sockets on hosts, yes,
the process might not be light-weight.
But, on routers, or once the socket is connected,
source address should be always set.

> This chunk won't apply to latest net-2.6.22, I've added two more
> flags yesterday.

Oops,... I'll send rebased version...

--yoshfuji
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