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-rw-r--r--net/sunrpc/svc.c79
1 files changed, 34 insertions, 45 deletions
diff --git a/net/sunrpc/svc.c b/net/sunrpc/svc.c
index bd0ee312dac9..142f64745fba 100644
--- a/net/sunrpc/svc.c
+++ b/net/sunrpc/svc.c
@@ -718,8 +718,6 @@ svc_exit_thread(struct svc_rqst *rqstp)
}
EXPORT_SYMBOL_GPL(svc_exit_thread);
-#ifdef CONFIG_SUNRPC_REGISTER_V4
-
/*
* Register an "inet" protocol family netid with the local
* rpcbind daemon via an rpcbind v4 SET request.
@@ -734,12 +732,13 @@ static int __svc_rpcb_register4(const u32 program, const u32 version,
const unsigned short protocol,
const unsigned short port)
{
- struct sockaddr_in sin = {
+ const struct sockaddr_in sin = {
.sin_family = AF_INET,
.sin_addr.s_addr = htonl(INADDR_ANY),
.sin_port = htons(port),
};
- char *netid;
+ const char *netid;
+ int error;
switch (protocol) {
case IPPROTO_UDP:
@@ -752,10 +751,20 @@ static int __svc_rpcb_register4(const u32 program, const u32 version,
return -ENOPROTOOPT;
}
- return rpcb_v4_register(program, version,
- (struct sockaddr *)&sin, netid);
+ error = rpcb_v4_register(program, version,
+ (const struct sockaddr *)&sin, netid);
+
+ /*
+ * User space didn't support rpcbind v4, so retry this
+ * registration request with the legacy rpcbind v2 protocol.
+ */
+ if (error == -EPROTONOSUPPORT)
+ error = rpcb_register(program, version, protocol, port);
+
+ return error;
}
+#if defined(CONFIG_IPV6) || defined(CONFIG_IPV6_MODULE)
/*
* Register an "inet6" protocol family netid with the local
* rpcbind daemon via an rpcbind v4 SET request.
@@ -770,12 +779,13 @@ static int __svc_rpcb_register6(const u32 program, const u32 version,
const unsigned short protocol,
const unsigned short port)
{
- struct sockaddr_in6 sin6 = {
+ const struct sockaddr_in6 sin6 = {
.sin6_family = AF_INET6,
.sin6_addr = IN6ADDR_ANY_INIT,
.sin6_port = htons(port),
};
- char *netid;
+ const char *netid;
+ int error;
switch (protocol) {
case IPPROTO_UDP:
@@ -788,9 +798,19 @@ static int __svc_rpcb_register6(const u32 program, const u32 version,
return -ENOPROTOOPT;
}
- return rpcb_v4_register(program, version,
- (struct sockaddr *)&sin6, netid);
+ error = rpcb_v4_register(program, version,
+ (const struct sockaddr *)&sin6, netid);
+
+ /*
+ * User space didn't support rpcbind version 4, so we won't
+ * use a PF_INET6 listener.
+ */
+ if (error == -EPROTONOSUPPORT)
+ error = -EAFNOSUPPORT;
+
+ return error;
}
+#endif /* defined(CONFIG_IPV6) || defined(CONFIG_IPV6_MODULE) */
/*
* Register a kernel RPC service via rpcbind version 4.
@@ -809,48 +829,17 @@ static int __svc_register(const u32 program, const u32 version,
case PF_INET:
return __svc_rpcb_register4(program, version,
protocol, port);
+ break;
+#if defined(CONFIG_IPV6) || defined(CONFIG_IPV6_MODULE)
case PF_INET6:
- error = __svc_rpcb_register6(program, version,
+ return__svc_rpcb_register6(program, version,
protocol, port);
- if (error < 0)
- return error;
-
- /*
- * Work around bug in some versions of Linux rpcbind
- * which don't allow registration of both inet and
- * inet6 netids.
- *
- * Error return ignored for now.
- */
- __svc_rpcb_register4(program, version,
- protocol, port);
- return 0;
+#endif /* defined(CONFIG_IPV6) || defined(CONFIG_IPV6_MODULE) */
}
return -EAFNOSUPPORT;
}
-#else /* CONFIG_SUNRPC_REGISTER_V4 */
-
-/*
- * Register a kernel RPC service via rpcbind version 2.
- *
- * Returns zero on success; a negative errno value is returned
- * if any error occurs.
- */
-static int __svc_register(const u32 program, const u32 version,
- const int family,
- const unsigned short protocol,
- const unsigned short port)
-{
- if (family != PF_INET)
- return -EAFNOSUPPORT;
-
- return rpcb_register(program, version, protocol, port);
-}
-
-#endif /* CONFIG_SUNRPC_REGISTER_V4 */
-
/**
* svc_register - register an RPC service with the local portmapper
* @serv: svc_serv struct for the service to register