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-rw-r--r--net/sunrpc/xprtsock.c11
1 files changed, 11 insertions, 0 deletions
diff --git a/net/sunrpc/xprtsock.c b/net/sunrpc/xprtsock.c
index c6b1d48..bf79212 100644
--- a/net/sunrpc/xprtsock.c
+++ b/net/sunrpc/xprtsock.c
@@ -2236,6 +2236,7 @@ static int xs_tcp_finish_connecting(struct rpc_xprt *xprt, struct socket *sock)
unsigned int keepcnt = xprt->timeout->to_retries + 1;
unsigned int opt_on = 1;
unsigned int timeo;
+ unsigned int addr_pref = IPV6_PREFER_SRC_PUBLIC;
/* TCP Keepalive options */
kernel_setsockopt(sock, SOL_SOCKET, SO_KEEPALIVE,
@@ -2247,6 +2248,16 @@ static int xs_tcp_finish_connecting(struct rpc_xprt *xprt, struct socket *sock)
kernel_setsockopt(sock, SOL_TCP, TCP_KEEPCNT,
(char *)&keepcnt, sizeof(keepcnt));
+ /* Avoid temporary address, they are bad for long-lived
+ * connections such as NFS mounts.
+ * RFC4941, section 3.6 suggests that:
+ * Individual applications, which have specific
+ * knowledge about the normal duration of connections,
+ * MAY override this as appropriate.
+ */
+ kernel_setsockopt(sock, SOL_IPV6, IPV6_ADDR_PREFERENCES,
+ (char *)&addr_pref, sizeof(addr_pref));
+
/* TCP user timeout (see RFC5482) */
timeo = jiffies_to_msecs(xprt->timeout->to_initval) *
(xprt->timeout->to_retries + 1);