SUNRPC: Set V6ONLY socket option for RPC listener sockets

[deliverable/linux.git] / net / sunrpc / svcsock.c

diff --git a/net/sunrpc/svcsock.c b/net/sunrpc/svcsock.c
index 3e65719f1ef698891d8e81ebea6c57e72b212717..f91377c149510d1e692673a7febd0ed2e207d8fc 100644 (file)
--- a/net/sunrpc/svcsock.c
+++ b/net/sunrpc/svcsock.c
@@ -1114,6 +1114,7 @@ static struct svc_sock *svc_setup_socket(struct svc_serv *serv,
        struct svc_sock *svsk;
        struct sock     *inet;
        int             pmap_register = !(flags & SVC_SOCK_ANONYMOUS);
+       int             val;
 
        dprintk("svc: svc_setup_socket %p\n", sock);
        if (!(svsk = kzalloc(sizeof(*svsk), GFP_KERNEL))) {
@@ -1146,6 +1147,18 @@ static struct svc_sock *svc_setup_socket(struct svc_serv *serv,
        else
                svc_tcp_init(svsk, serv);
 
+       /*
+        * We start one listener per sv_serv.  We want AF_INET
+        * requests to be automatically shunted to our AF_INET6
+        * listener using a mapped IPv4 address.  Make sure
+        * no-one starts an equivalent IPv4 listener, which
+        * would steal our incoming connections.
+        */
+       val = 0;
+       if (serv->sv_family == AF_INET6)
+               kernel_setsockopt(sock, SOL_IPV6, IPV6_V6ONLY,
+                                       (char *)&val, sizeof(val));
+
        dprintk("svc: svc_setup_socket created %p (inet %p)\n",
                                svsk, svsk->sk_sk);