netdev - Re: TCP using IPv4-mapped IPv6 address as source

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Message-ID: <1484151607.21472.55.camel@edumazet-glaptop3.roam.corp.google.com>
Date:   Wed, 11 Jan 2017 08:20:07 -0800
From:   Eric Dumazet <eric.dumazet@...il.com>
To:     "Jonathan T. Leighton" <jtleight@...l.edu>
Cc:     netdev@...r.kernel.org, edumazet@...gle.com,
        Yuchung Cheng <ycheng@...gle.com>,
        Neal Cardwell <ncardwell@...gle.com>
Subject: Re: TCP using IPv4-mapped IPv6 address as source

On Thu, 2017-01-05 at 16:25 -0500, Jonathan T. Leighton wrote:
> I've observed TCP using an IPv4-mapped IPv6 address as the source 
> address, which I believe contradicts 
> https://tools.ietf.org/html/rfc6890#page-14 (BCP 153). This occurs when 
> an IPv6 TCP socket, bound to a local IPv4-mapped IPv6 address, attempts 
> to connect to a remote IPv6 address. Presumable connect() should return 
> EAFNOSUPPORT in this case. Please advise me if this is not to 
> appropriate list to report this.

Hi Jonathan

I believe your concern makes sense.
Do you have a patch to address this issue ?

Thanks