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Diffstat (limited to 'net/sunrpc/rpcb_clnt.c')
-rw-r--r--net/sunrpc/rpcb_clnt.c97
1 files changed, 83 insertions, 14 deletions
diff --git a/net/sunrpc/rpcb_clnt.c b/net/sunrpc/rpcb_clnt.c
index c652e4cc9fe9..9a80a922c527 100644
--- a/net/sunrpc/rpcb_clnt.c
+++ b/net/sunrpc/rpcb_clnt.c
@@ -16,6 +16,7 @@
#include <linux/types.h>
#include <linux/socket.h>
+#include <linux/un.h>
#include <linux/in.h>
#include <linux/in6.h>
#include <linux/kernel.h>
@@ -32,6 +33,8 @@
# define RPCDBG_FACILITY RPCDBG_BIND
#endif
+#define RPCBIND_SOCK_PATHNAME "/var/run/rpcbind.sock"
+
#define RPCBIND_PROGRAM (100000u)
#define RPCBIND_PORT (111u)
@@ -158,20 +161,69 @@ static void rpcb_map_release(void *data)
kfree(map);
}
-static const struct sockaddr_in rpcb_inaddr_loopback = {
- .sin_family = AF_INET,
- .sin_addr.s_addr = htonl(INADDR_LOOPBACK),
- .sin_port = htons(RPCBIND_PORT),
-};
+/*
+ * Returns zero on success, otherwise a negative errno value
+ * is returned.
+ */
+static int rpcb_create_local_unix(void)
+{
+ static const struct sockaddr_un rpcb_localaddr_rpcbind = {
+ .sun_family = AF_LOCAL,
+ .sun_path = RPCBIND_SOCK_PATHNAME,
+ };
+ struct rpc_create_args args = {
+ .net = &init_net,
+ .protocol = XPRT_TRANSPORT_LOCAL,
+ .address = (struct sockaddr *)&rpcb_localaddr_rpcbind,
+ .addrsize = sizeof(rpcb_localaddr_rpcbind),
+ .servername = "localhost",
+ .program = &rpcb_program,
+ .version = RPCBVERS_2,
+ .authflavor = RPC_AUTH_NULL,
+ };
+ struct rpc_clnt *clnt, *clnt4;
+ int result = 0;
+
+ /*
+ * Because we requested an RPC PING at transport creation time,
+ * this works only if the user space portmapper is rpcbind, and
+ * it's listening on AF_LOCAL on the named socket.
+ */
+ clnt = rpc_create(&args);
+ if (IS_ERR(clnt)) {
+ dprintk("RPC: failed to create AF_LOCAL rpcbind "
+ "client (errno %ld).\n", PTR_ERR(clnt));
+ result = -PTR_ERR(clnt);
+ goto out;
+ }
+
+ clnt4 = rpc_bind_new_program(clnt, &rpcb_program, RPCBVERS_4);
+ if (IS_ERR(clnt4)) {
+ dprintk("RPC: failed to bind second program to "
+ "rpcbind v4 client (errno %ld).\n",
+ PTR_ERR(clnt4));
+ clnt4 = NULL;
+ }
+
+ /* Protected by rpcb_create_local_mutex */
+ rpcb_local_clnt = clnt;
+ rpcb_local_clnt4 = clnt4;
-static DEFINE_MUTEX(rpcb_create_local_mutex);
+out:
+ return result;
+}
/*
* Returns zero on success, otherwise a negative errno value
* is returned.
*/
-static int rpcb_create_local(void)
+static int rpcb_create_local_net(void)
{
+ static const struct sockaddr_in rpcb_inaddr_loopback = {
+ .sin_family = AF_INET,
+ .sin_addr.s_addr = htonl(INADDR_LOOPBACK),
+ .sin_port = htons(RPCBIND_PORT),
+ };
struct rpc_create_args args = {
.net = &init_net,
.protocol = XPRT_TRANSPORT_TCP,
@@ -186,13 +238,6 @@ static int rpcb_create_local(void)
struct rpc_clnt *clnt, *clnt4;
int result = 0;
- if (rpcb_local_clnt)
- return result;
-
- mutex_lock(&rpcb_create_local_mutex);
- if (rpcb_local_clnt)
- goto out;
-
clnt = rpc_create(&args);
if (IS_ERR(clnt)) {
dprintk("RPC: failed to create local rpcbind "
@@ -214,10 +259,34 @@ static int rpcb_create_local(void)
clnt4 = NULL;
}
+ /* Protected by rpcb_create_local_mutex */
rpcb_local_clnt = clnt;
rpcb_local_clnt4 = clnt4;
out:
+ return result;
+}
+
+/*
+ * Returns zero on success, otherwise a negative errno value
+ * is returned.
+ */
+static int rpcb_create_local(void)
+{
+ static DEFINE_MUTEX(rpcb_create_local_mutex);
+ int result = 0;
+
+ if (rpcb_local_clnt)
+ return result;
+
+ mutex_lock(&rpcb_create_local_mutex);
+ if (rpcb_local_clnt)
+ goto out;
+
+ if (rpcb_create_local_unix() != 0)
+ result = rpcb_create_local_net();
+
+out:
mutex_unlock(&rpcb_create_local_mutex);
return result;
}