SUNRPC: prevent port reuse on transports which don't request it.

[ Upstream commit bc1c56e9bbe92766d017efb5f0a0c71f80da5570 ]

If an RPC client is created without RPC_CLNT_CREATE_REUSEPORT, it should
not reuse the source port when a TCP connection is re-established.
This is currently implemented by preventing the source port being
recorded after a successful connection (the call to xs_set_srcport()).

However the source port is also recorded after a successful bind in xs_bind().
This may not be needed at all and certainly is not wanted when
RPC_CLNT_CREATE_REUSEPORT wasn't requested.

So avoid that assignment when xprt.reuseport is not set.

With this change, NFSv4.1 and later mounts use a different port number on
each connection.  This is helpful with some firewalls which don't cope
well with port reuse.

Signed-off-by: NeilBrown <neilb@suse.de>
Fixes: e6237b6feb37 ("NFSv4.1: Don't rebind to the same source port when reconnecting to the server")
Signed-off-by: Trond Myklebust <trond.myklebust@hammerspace.com>
Signed-off-by: Sasha Levin <sashal@kernel.org>

diff --git a/net/sunrpc/xprtsock.c b/net/sunrpc/xprtsock.c
index e35760f238a400cac8734088299d2656f78bd8a6..87cb0e36eadeba8f206864830acf933ed49865cb 100644 (file)
--- a/net/sunrpc/xprtsock.c
+++ b/net/sunrpc/xprtsock.c
@@ -1680,7 +1680,8 @@ static int xs_bind(struct sock_xprt *transport, struct socket *sock)
                err = kernel_bind(sock, (struct sockaddr *)&myaddr,
                                transport->xprt.addrlen);
                if (err == 0) {
-                       transport->srcport = port;
+                       if (transport->xprt.reuseport)
+                               transport->srcport = port;
                        break;
                }
                last = port;