SUNRPC: Ensure that the TCP socket is closed when in CLOSE_WAIT

commit a519fc7a70d1a918574bb826cc6905b87b482eb9 upstream.

Instead of doing a shutdown() call, we need to do an actual close().
Ditto if/when the server is sending us junk RPC headers.

Signed-off-by: Trond Myklebust <Trond.Myklebust@netapp.com>
Tested-by: Simon Kirby <sim@hostway.ca>
Signed-off-by: Ben Hutchings <ben@decadent.org.uk>

diff --git a/net/sunrpc/xprtsock.c b/net/sunrpc/xprtsock.c
index c5391af32d6a0b81c2fc6c886da5fcd6178628f7..10a385b4181a437c1926e165a9dbbdb3e02391da 100644 (file)
--- a/net/sunrpc/xprtsock.c
+++ b/net/sunrpc/xprtsock.c
@@ -1028,6 +1028,16 @@ static void xs_udp_data_ready(struct sock *sk, int len)
        read_unlock_bh(&sk->sk_callback_lock);
 }
 
+/*
+ * Helper function to force a TCP close if the server is sending
+ * junk and/or it has put us in CLOSE_WAIT
+ */
+static void xs_tcp_force_close(struct rpc_xprt *xprt)
+{
+       set_bit(XPRT_CONNECTION_CLOSE, &xprt->state);
+       xprt_force_disconnect(xprt);
+}
+
 static inline void xs_tcp_read_fraghdr(struct rpc_xprt *xprt, struct xdr_skb_reader *desc)
 {
        struct sock_xprt *transport = container_of(xprt, struct sock_xprt, xprt);
@@ -1054,7 +1064,7 @@ static inline void xs_tcp_read_fraghdr(struct rpc_xprt *xprt, struct xdr_skb_rea
        /* Sanity check of the record length */
        if (unlikely(transport->tcp_reclen < 8)) {
                dprintk("RPC:       invalid TCP record fragment length\n");
-               xprt_force_disconnect(xprt);
+               xs_tcp_force_close(xprt);
                return;
        }
        dprintk("RPC:       reading TCP record fragment of length %d\n",
@@ -1135,7 +1145,7 @@ static inline void xs_tcp_read_calldir(struct sock_xprt *transport,
                break;
        default:
                dprintk("RPC:       invalid request message type\n");
-               xprt_force_disconnect(&transport->xprt);
+               xs_tcp_force_close(&transport->xprt);
        }
        xs_tcp_check_fraghdr(transport);
 }
@@ -1458,6 +1468,8 @@ static void xs_tcp_cancel_linger_timeout(struct rpc_xprt *xprt)
 static void xs_sock_mark_closed(struct rpc_xprt *xprt)
 {
        smp_mb__before_clear_bit();
+       clear_bit(XPRT_CONNECTION_ABORT, &xprt->state);
+       clear_bit(XPRT_CONNECTION_CLOSE, &xprt->state);
        clear_bit(XPRT_CLOSE_WAIT, &xprt->state);
        clear_bit(XPRT_CLOSING, &xprt->state);
        smp_mb__after_clear_bit();
@@ -1515,8 +1527,8 @@ static void xs_tcp_state_change(struct sock *sk)
                break;
        case TCP_CLOSE_WAIT:
                /* The server initiated a shutdown of the socket */
-               xprt_force_disconnect(xprt);
                xprt->connect_cookie++;
+               xs_tcp_force_close(xprt);
        case TCP_CLOSING:
                /*
                 * If the server closed down the connection, make sure that
@@ -2159,8 +2171,7 @@ static void xs_tcp_setup_socket(struct work_struct *work)
                /* We're probably in TIME_WAIT. Get rid of existing socket,
                 * and retry
                 */
-               set_bit(XPRT_CONNECTION_CLOSE, &xprt->state);
-               xprt_force_disconnect(xprt);
+               xs_tcp_force_close(xprt);
                break;
        case -ECONNREFUSED:
        case -ECONNRESET: