@@ -1667,6 +1667,39 @@ static unsigned short xs_get_random_port(void)
}
/**
+ * xs_set_reuseaddr_port - set the socket's port and address reuse options
+ * @sock: socket
+ *
+ * Note that this function has to be called on all sockets that share the
+ * same port, and it must be called before binding.
+ */
+static void xs_sock_set_reuseport(struct socket *sock)
+{
+ char opt = 1;
+
+ kernel_setsockopt(sock, SOL_SOCKET, SO_REUSEPORT, &opt, sizeof(opt));
+}
+
+static unsigned short xs_sock_getport(struct socket *sock)
+{
+ struct sockaddr_storage buf;
+ int buflen;
+ unsigned short port = 0;
+
+ if (kernel_getsockname(sock, (struct sockaddr *)&buf, &buflen) < 0)
+ goto out;
+ switch (buf.ss_family) {
+ case AF_INET6:
+ port = ntohs(((struct sockaddr_in6 *)&buf)->sin6_port);
+ break;
+ case AF_INET:
+ port = ntohs(((struct sockaddr_in *)&buf)->sin_port);
+ }
+out:
+ return port;
+}
+
+/**
* xs_set_port - reset the port number in the remote endpoint address
* @xprt: generic transport
* @port: new port number
@@ -1680,6 +1713,12 @@ static void xs_set_port(struct rpc_xprt *xprt, unsigned short port)
xs_update_peer_port(xprt);
}
+static void xs_set_srcport(struct sock_xprt *transport, struct socket *sock)
+{
+ if (transport->srcport == 0)
+ transport->srcport = xs_sock_getport(sock);
+}
+
static unsigned short xs_get_srcport(struct sock_xprt *transport)
{
unsigned short port = transport->srcport;
@@ -1833,7 +1872,8 @@ static void xs_dummy_setup_socket(struct work_struct *work)
}
static struct socket *xs_create_sock(struct rpc_xprt *xprt,
- struct sock_xprt *transport, int family, int type, int protocol)
+ struct sock_xprt *transport, int family, int type,
+ int protocol, bool reuseport)
{
struct socket *sock;
int err;
@@ -1846,6 +1886,9 @@ static struct socket *xs_create_sock(struct rpc_xprt *xprt,
}
xs_reclassify_socket(family, sock);
+ if (reuseport)
+ xs_sock_set_reuseport(sock);
+
err = xs_bind(transport, sock);
if (err) {
sock_release(sock);
@@ -2047,7 +2090,8 @@ static void xs_udp_setup_socket(struct work_struct *work)
/* Start by resetting any existing state */
xs_reset_transport(transport);
sock = xs_create_sock(xprt, transport,
- xs_addr(xprt)->sa_family, SOCK_DGRAM, IPPROTO_UDP);
+ xs_addr(xprt)->sa_family, SOCK_DGRAM,
+ IPPROTO_UDP, false);
if (IS_ERR(sock))
goto out;
@@ -2149,7 +2193,6 @@ static int xs_tcp_finish_connecting(struct rpc_xprt *xprt, struct socket *sock)
sk->sk_allocation = GFP_ATOMIC;
/* socket options */
- sk->sk_userlocks |= SOCK_BINDPORT_LOCK;
sock_reset_flag(sk, SOCK_LINGER);
tcp_sk(sk)->linger2 = 0;
tcp_sk(sk)->nonagle |= TCP_NAGLE_OFF;
@@ -2174,6 +2217,7 @@ static int xs_tcp_finish_connecting(struct rpc_xprt *xprt, struct socket *sock)
ret = kernel_connect(sock, xs_addr(xprt), xprt->addrlen, O_NONBLOCK);
switch (ret) {
case 0:
+ xs_set_srcport(transport, sock);
case -EINPROGRESS:
/* SYN_SENT! */
if (xprt->reestablish_timeout < XS_TCP_INIT_REEST_TO)
@@ -2202,7 +2246,8 @@ static void xs_tcp_setup_socket(struct work_struct *work)
if (!sock) {
clear_bit(XPRT_CONNECTION_ABORT, &xprt->state);
sock = xs_create_sock(xprt, transport,
- xs_addr(xprt)->sa_family, SOCK_STREAM, IPPROTO_TCP);
+ xs_addr(xprt)->sa_family, SOCK_STREAM,
+ IPPROTO_TCP, true);
if (IS_ERR(sock)) {
status = PTR_ERR(sock);
goto out;
When using TCP, we need the ability to reuse port numbers after a disconnection, so that the NFSv3 server knows that we're the same client. Currently we use a hack to work around the TCP socket's TIME_WAIT: we send an RST instead of closing, which doesn't always work... The SO_REUSEPORT option added in Linux 3.9 allows us to bind multiple TCP connections to the same source address+port combination, and thus to use ordinary TCP close() instead of the current hack. Signed-off-by: Trond Myklebust <trond.myklebust@primarydata.com> --- net/sunrpc/xprtsock.c | 53 +++++++++++++++++++++++++++++++++++++++++++++++---- 1 file changed, 49 insertions(+), 4 deletions(-)