netdev - Re: [PATCH net-next v2] tcp: metrics: Handle v6/v4-mapped sockets in tcp-metrics

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Message-ID: <20140123232638.GA5520@cpaasch-mac>
Date:	Fri, 24 Jan 2014 00:26:38 +0100
From:	Christoph Paasch <christoph.paasch@...ouvain.be>
To:	David Miller <davem@...emloft.net>
Cc:	netdev@...r.kernel.org
Subject: Re: [PATCH net-next v2] tcp: metrics: Handle v6/v4-mapped sockets in
 tcp-metrics

On 23/01/14 - 12:49:26, David Miller wrote:
> From: Christoph Paasch <christoph.paasch@...ouvain.be>
> Date: Wed, 22 Jan 2014 13:58:44 +0100
> 
> > A socket may be v6/v4-mapped. In that case sk->sk_family is AF_INET6,
> > but the IP being used is actually an IPv4-address.
> > Current's tcp-metrics will thus represent it as an IPv6-address:
> > 
> > root@...ver:~# ip tcp_metrics
> > ::ffff:10.1.1.2 age 22.920sec rtt 18750us rttvar 15000us cwnd 10
> > 10.1.1.2 age 47.970sec rtt 16250us rttvar 10000us cwnd 10
> > 
> > This patch modifies the tcp-metrics so that they are able to handle the
> > v6/v4-mapped sockets correctly.
> > 
> > Signed-off-by: Christoph Paasch <christoph.paasch@...ouvain.be>
> 
> Applied, but I guess you didn't look at the build warnings, nor thoroughly
> test this:
> 
> > +	else if (sk->sk_family = AF_INET6) {
> 
> That's an assignment, not a straight test, and the compiler warns
> about it.
> 
> I fixed it when I applied this, but please don't be so sloppy in the
> future.

Ouch, I'm really sorry. Thanks for fixing it.

I did actually test it and it worked, because if sk_family is not AF_INET
then it can only be AF_INET6 and so the assignment won't change sk_family
and the if condition will be true.

Anyways, I will pay more attention in the future.

Thanks!

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