linux-kernel - Re: [NFS] [PATCH 001 of 3] knfsd: Use recv_msg to get peer address for NFSD instead of code-copying

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Date:	Tue, 6 Mar 2007 10:47:53 +1100
From:	Neil Brown <neilb@...e.de>
To:	Olaf Kirch <olaf.kirch@...cle.com>
Cc:	nfs@...ts.sourceforge.net,
	Andrew Morton <akpm@...ux-foundation.org>,
	netdev@...r.kernel.org, linux-kernel@...r.kernel.org
Subject: Re: [NFS] [PATCH 001 of 3] knfsd: Use recv_msg to get peer address for NFSD instead of code-copying

On Monday March 5, olaf.kirch@...cle.com wrote:
> On Friday 02 March 2007 05:28, NeilBrown wrote:
> > The sunrpc server code needs to know the source and destination address
> > for UDP packets so it can reply properly.
> > It currently copies code out of the network stack to pick the pieces out
> > of the skb.
> > This is ugly and causes compile problems with the IPv6 stuff.
> 
> ... and this IPv6 code could never have worked anyway:

:-(
It's hard to test the IPv6 server until we have an IPv6 client I
guess, so thanks for the code review, even though we aren't going to
end up using that code...

> 
> But I find using recvmsg just for getting at the addresses
> a little awkward too.

Do you?  It's surely a lot better than code duplication, and it is
exactly how you would get the information from user-space.

>                       And I think to be on the safe side, you
> should check that you're really looking at a PKTINFO cmsg
> rather than something else.

Maybe.....
But is there really a chance that it might not be PKTINFO?
And what do you do if it isn't?
Log an error and drop the packet I guess.

I'll see what I can do.

NeilBrown
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