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authorNeilBrown <neilb@suse.de>2021-06-15 04:18:38 +0300
committerTrond Myklebust <trond.myklebust@hammerspace.com>2021-06-21 19:06:16 +0300
commitbc1c56e9bbe92766d017efb5f0a0c71f80da5570 (patch)
tree489d8d1a2267007ccc852f7a3d20912ffebf3214 /net
parentbb24cc0f37a2d12f780ab2a57df046274a0bec38 (diff)
downloadlinux-bc1c56e9bbe92766d017efb5f0a0c71f80da5570.tar.xz
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>
Diffstat (limited to 'net')
-rw-r--r--net/sunrpc/xprtsock.c3
1 files changed, 2 insertions, 1 deletions
diff --git a/net/sunrpc/xprtsock.c b/net/sunrpc/xprtsock.c
index 316d04945587..3228b7a1836a 100644
--- a/net/sunrpc/xprtsock.c
+++ b/net/sunrpc/xprtsock.c
@@ -1689,7 +1689,8 @@ 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;