netdev - Re: [PATCH net-next 0/3] mptcp: add REUSEADDR/REUSEPORT/V6ONLY setsockopt support

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Date:   Sat, 04 Jul 2020 17:57:24 -0700 (PDT)
From:   David Miller <davem@...emloft.net>
To:     fw@...len.de
Cc:     netdev@...r.kernel.org, mptcp@...ts.01.org
Subject: Re: [PATCH net-next 0/3] mptcp: add REUSEADDR/REUSEPORT/V6ONLY
 setsockopt support

From: Florian Westphal <fw@...len.de>
Date: Sun,  5 Jul 2020 01:30:14 +0200

> restarting an mptcp-patched sshd yields following error:
> 
>   sshd: error: Bind to port 22 on 0.0.0.0 failed: Address already in use.
>   sshd: error: setsockopt IPV6_V6ONLY: Operation not supported
>   sshd: error: Bind to port 22 on :: failed: Address already in use.
>   sshd: fatal: Cannot bind any address.
> 
> This series adds support for the needed setsockopts:
> 
> First patch skips the generic SOL_SOCKET handler for MPTCP:
> in mptcp case, the setsockopt needs to alter the tcp socket, not the mptcp
> parent socket.
> 
> Second patch adds minimal SOL_SOCKET support: REUSEPORT and REUSEADDR.
> Rest is still handled by the generic SOL_SOCKET code.
> 
> Last patch adds IPV6ONLY support.  This makes ipv6 work for openssh:
> It creates two listening sockets, before this patch, binding the ipv6
> socket will fail because the port is already bound by the ipv4 one.

Series applied, thanks Florian.