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H A D | xprtsock.c | bc1c56e9 Mon Jun 14 20:18:38 CDT 2021 NeilBrown <neilb@suse.de> SUNRPC: prevent port reuse on transports which don't request it.
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>
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