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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Message-Id: <200703051953.24900.olaf.kirch@oracle.com>
Date:	Mon, 5 Mar 2007 19:53:23 +0100
From:	Olaf Kirch <olaf.kirch@...cle.com>
To:	nfs@...ts.sourceforge.net
Cc:	NeilBrown <neilb@...e.de>,
	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 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:


>  	case AF_INET6: {
...
> -			rqstp->rq_addrlen = sizeof(struct sockaddr_in);
... this should have been sizeof(sockaddr_in6)...

> -			/* Remember which interface received this request */
> -			ipv6_addr_copy(&rqstp->rq_daddr.addr6,
> -							&skb->nh.ipv6h->saddr);
.... and this should have copied from daddr, not saddr.

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

Olaf
-- 
Olaf Kirch  |  --- o --- Nous sommes du soleil we love when we play
okir@....de |    / | \   sol.dhoop.naytheet.ah kin.ir.samse.qurax
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