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Message-Id: <20200704233017.20831-1-fw@strlen.de>
Date: Sun, 5 Jul 2020 01:30:14 +0200
From: Florian Westphal <fw@...len.de>
To: <netdev@...r.kernel.org>
Cc: <mptcp@...ts.01.org>
Subject: [PATCH net-next 0/3] mptcp: add REUSEADDR/REUSEPORT/V6ONLY setsockopt support
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.
Florian Westphal (3):
net: use mptcp setsockopt function for SOL_SOCKET on mptcp sockets
mptcp: add REUSEADDR/REUSEPORT support
mptcp: support IPV6_V6ONLY setsockopt
net/mptcp/protocol.c | 64 ++++++++++++++++++++++++++++++++++++++++++++++++++++
net/socket.c | 13 ++++++++++-
2 files changed, 76 insertions(+), 1 deletion(-)
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