1 files changed, 287 insertions, 69 deletions

diff --git a/net/sunrpc/rpcb_clnt.c b/net/sunrpc/rpcb_clnt.c
index e6fb21b19b8..24db2b4d12d 100644
--- a/net/sunrpc/rpcb_clnt.c
+++ b/net/sunrpc/rpcb_clnt.c
@@ -32,6 +32,10 @@
 #define RPCBIND_PROGRAM		(100000u)
 #define RPCBIND_PORT		(111u)
 
+#define RPCBVERS_2		(2u)
+#define RPCBVERS_3		(3u)
+#define RPCBVERS_4		(4u)
+
 enum {
 	RPCBPROC_NULL,
 	RPCBPROC_SET,
@@ -64,6 +68,7 @@ enum {
 #define RPCB_MAXOWNERLEN	sizeof(RPCB_OWNER_STRING)
 
 static void			rpcb_getport_done(struct rpc_task *, void *);
+static void			rpcb_map_release(void *data);
 static struct rpc_program	rpcb_program;
 
 struct rpcbind_args {
@@ -76,41 +81,73 @@ struct rpcbind_args {
 	const char *		r_netid;
 	const char *		r_addr;
 	const char *		r_owner;
+
+	int			r_status;
 };
 
 static struct rpc_procinfo rpcb_procedures2[];
 static struct rpc_procinfo rpcb_procedures3[];
+static struct rpc_procinfo rpcb_procedures4[];
 
 struct rpcb_info {
-	int			rpc_vers;
+	u32			rpc_vers;
 	struct rpc_procinfo *	rpc_proc;
 };
 
 static struct rpcb_info rpcb_next_version[];
 static struct rpcb_info rpcb_next_version6[];
 
+static const struct rpc_call_ops rpcb_getport_ops = {
+	.rpc_call_done		= rpcb_getport_done,
+	.rpc_release		= rpcb_map_release,
+};
+
+static void rpcb_wake_rpcbind_waiters(struct rpc_xprt *xprt, int status)
+{
+	xprt_clear_binding(xprt);
+	rpc_wake_up_status(&xprt->binding, status);
+}
+
 static void rpcb_map_release(void *data)
 {
 	struct rpcbind_args *map = data;
 
+	rpcb_wake_rpcbind_waiters(map->r_xprt, map->r_status);
 	xprt_put(map->r_xprt);
 	kfree(map);
 }
 
-static const struct rpc_call_ops rpcb_getport_ops = {
-	.rpc_call_done		= rpcb_getport_done,
-	.rpc_release		= rpcb_map_release,
+static const struct sockaddr_in rpcb_inaddr_loopback = {
+	.sin_family		= AF_INET,
+	.sin_addr.s_addr	= htonl(INADDR_LOOPBACK),
+	.sin_port		= htons(RPCBIND_PORT),
 };
 
-static void rpcb_wake_rpcbind_waiters(struct rpc_xprt *xprt, int status)
+static const struct sockaddr_in6 rpcb_in6addr_loopback = {
+	.sin6_family		= AF_INET6,
+	.sin6_addr		= IN6ADDR_LOOPBACK_INIT,
+	.sin6_port		= htons(RPCBIND_PORT),
+};
+
+static struct rpc_clnt *rpcb_create_local(struct sockaddr *addr,
+					  size_t addrlen, u32 version)
 {
-	xprt_clear_binding(xprt);
-	rpc_wake_up_status(&xprt->binding, status);
+	struct rpc_create_args args = {
+		.protocol	= XPRT_TRANSPORT_UDP,
+		.address	= addr,
+		.addrsize	= addrlen,
+		.servername	= "localhost",
+		.program	= &rpcb_program,
+		.version	= version,
+		.authflavor	= RPC_AUTH_UNIX,
+		.flags		= RPC_CLNT_CREATE_NOPING,
+	};
+
+	return rpc_create(&args);
 }
 
 static struct rpc_clnt *rpcb_create(char *hostname, struct sockaddr *srvaddr,
-				    size_t salen, int proto, u32 version,
-				    int privileged)
+				    size_t salen, int proto, u32 version)
 {
 	struct rpc_create_args args = {
 		.protocol	= proto,
@@ -120,7 +157,8 @@ static struct rpc_clnt *rpcb_create(char *hostname, struct sockaddr *srvaddr,
 		.program	= &rpcb_program,
 		.version	= version,
 		.authflavor	= RPC_AUTH_UNIX,
-		.flags		= RPC_CLNT_CREATE_NOPING,
+		.flags		= (RPC_CLNT_CREATE_NOPING |
+					RPC_CLNT_CREATE_NONPRIVPORT),
 	};
 
 	switch (srvaddr->sa_family) {
@@ -134,29 +172,72 @@ static struct rpc_clnt *rpcb_create(char *hostname, struct sockaddr *srvaddr,
 		return NULL;
 	}
 
-	if (!privileged)
-		args.flags |= RPC_CLNT_CREATE_NONPRIVPORT;
 	return rpc_create(&args);
 }
 
+static int rpcb_register_call(struct sockaddr *addr, size_t addrlen,
+			      u32 version, struct rpc_message *msg,
+			      int *result)
+{
+	struct rpc_clnt *rpcb_clnt;
+	int error = 0;
+
+	*result = 0;
+
+	rpcb_clnt = rpcb_create_local(addr, addrlen, version);
+	if (!IS_ERR(rpcb_clnt)) {
+		error = rpc_call_sync(rpcb_clnt, msg, 0);
+		rpc_shutdown_client(rpcb_clnt);
+	} else
+		error = PTR_ERR(rpcb_clnt);
+
+	if (error < 0)
+		printk(KERN_WARNING "RPC: failed to contact local rpcbind "
+				"server (errno %d).\n", -error);
+	dprintk("RPC:       registration status %d/%d\n", error, *result);
+
+	return error;
+}
+
 /**
  * rpcb_register - set or unset a port registration with the local rpcbind svc
  * @prog: RPC program number to bind
  * @vers: RPC version number to bind
- * @prot: transport protocol to use to make this request
+ * @prot: transport protocol to register
  * @port: port value to register
- * @okay: result code
+ * @okay: OUT: result code
  *
- * port == 0 means unregister, port != 0 means register.
+ * RPC services invoke this function to advertise their contact
+ * information via the system's rpcbind daemon.  RPC services
+ * invoke this function once for each [program, version, transport]
+ * tuple they wish to advertise.
  *
- * This routine supports only rpcbind version 2.
+ * Callers may also unregister RPC services that are no longer
+ * available by setting the passed-in port to zero.  This removes
+ * all registered transports for [program, version] from the local
+ * rpcbind database.
+ *
+ * Returns zero if the registration request was dispatched
+ * successfully and a reply was received.  The rpcbind daemon's
+ * boolean result code is stored in *okay.
+ *
+ * Returns an errno value and sets *result to zero if there was
+ * some problem that prevented the rpcbind request from being
+ * dispatched, or if the rpcbind daemon did not respond within
+ * the timeout.
+ *
+ * This function uses rpcbind protocol version 2 to contact the
+ * local rpcbind daemon.
+ *
+ * Registration works over both AF_INET and AF_INET6, and services
+ * registered via this function are advertised as available for any
+ * address.  If the local rpcbind daemon is listening on AF_INET6,
+ * services registered via this function will be advertised on
+ * IN6ADDR_ANY (ie available for all AF_INET and AF_INET6
+ * addresses).
  */
 int rpcb_register(u32 prog, u32 vers, int prot, unsigned short port, int *okay)
 {
-	struct sockaddr_in sin = {
-		.sin_family		= AF_INET,
-		.sin_addr.s_addr	= htonl(INADDR_LOOPBACK),
-	};
 	struct rpcbind_args map = {
 		.r_prog		= prog,
 		.r_vers		= vers,
@@ -164,32 +245,159 @@ int rpcb_register(u32 prog, u32 vers, int prot, unsigned short port, int *okay)
 		.r_port		= port,
 	};
 	struct rpc_message msg = {
-		.rpc_proc	= &rpcb_procedures2[port ?
-					RPCBPROC_SET : RPCBPROC_UNSET],
 		.rpc_argp	= &map,
 		.rpc_resp	= okay,
 	};
-	struct rpc_clnt *rpcb_clnt;
-	int error = 0;
 
 	dprintk("RPC:       %sregistering (%u, %u, %d, %u) with local "
 			"rpcbind\n", (port ? "" : "un"),
 			prog, vers, prot, port);
 
-	rpcb_clnt = rpcb_create("localhost", (struct sockaddr *) &sin,
-				sizeof(sin), XPRT_TRANSPORT_UDP, 2, 1);
-	if (IS_ERR(rpcb_clnt))
-		return PTR_ERR(rpcb_clnt);
+	msg.rpc_proc = &rpcb_procedures2[RPCBPROC_UNSET];
+	if (port)
+		msg.rpc_proc = &rpcb_procedures2[RPCBPROC_SET];
 
-	error = rpc_call_sync(rpcb_clnt, &msg, 0);
+	return rpcb_register_call((struct sockaddr *)&rpcb_inaddr_loopback,
+					sizeof(rpcb_inaddr_loopback),
+					RPCBVERS_2, &msg, okay);
+}
 
-	rpc_shutdown_client(rpcb_clnt);
-	if (error < 0)
-		printk(KERN_WARNING "RPC: failed to contact local rpcbind "
-				"server (errno %d).\n", -error);
-	dprintk("RPC:       registration status %d/%d\n", error, *okay);
+/*
+ * Fill in AF_INET family-specific arguments to register
+ */
+static int rpcb_register_netid4(struct sockaddr_in *address_to_register,
+				struct rpc_message *msg)
+{
+	struct rpcbind_args *map = msg->rpc_argp;
+	unsigned short port = ntohs(address_to_register->sin_port);
+	char buf[32];
 
-	return error;
+	/* Construct AF_INET universal address */
+	snprintf(buf, sizeof(buf),
+			NIPQUAD_FMT".%u.%u",
+			NIPQUAD(address_to_register->sin_addr.s_addr),
+			port >> 8, port & 0xff);
+	map->r_addr = buf;
+
+	dprintk("RPC:       %sregistering [%u, %u, %s, '%s'] with "
+		"local rpcbind\n", (port ? "" : "un"),
+			map->r_prog, map->r_vers,
+			map->r_addr, map->r_netid);
+
+	msg->rpc_proc = &rpcb_procedures4[RPCBPROC_UNSET];
+	if (port)
+		msg->rpc_proc = &rpcb_procedures4[RPCBPROC_SET];
+
+	return rpcb_register_call((struct sockaddr *)&rpcb_inaddr_loopback,
+					sizeof(rpcb_inaddr_loopback),
+					RPCBVERS_4, msg, msg->rpc_resp);
+}
+
+/*
+ * Fill in AF_INET6 family-specific arguments to register
+ */
+static int rpcb_register_netid6(struct sockaddr_in6 *address_to_register,
+				struct rpc_message *msg)
+{
+	struct rpcbind_args *map = msg->rpc_argp;
+	unsigned short port = ntohs(address_to_register->sin6_port);
+	char buf[64];
+
+	/* Construct AF_INET6 universal address */
+	snprintf(buf, sizeof(buf),
+			NIP6_FMT".%u.%u",
+			NIP6(address_to_register->sin6_addr),
+			port >> 8, port & 0xff);
+	map->r_addr = buf;
+
+	dprintk("RPC:       %sregistering [%u, %u, %s, '%s'] with "
+		"local rpcbind\n", (port ? "" : "un"),
+			map->r_prog, map->r_vers,
+			map->r_addr, map->r_netid);
+
+	msg->rpc_proc = &rpcb_procedures4[RPCBPROC_UNSET];
+	if (port)
+		msg->rpc_proc = &rpcb_procedures4[RPCBPROC_SET];
+
+	return rpcb_register_call((struct sockaddr *)&rpcb_in6addr_loopback,
+					sizeof(rpcb_in6addr_loopback),
+					RPCBVERS_4, msg, msg->rpc_resp);
+}
+
+/**
+ * rpcb_v4_register - set or unset a port registration with the local rpcbind
+ * @program: RPC program number of service to (un)register
+ * @version: RPC version number of service to (un)register
+ * @address: address family, IP address, and port to (un)register
+ * @netid: netid of transport protocol to (un)register
+ * @result: result code from rpcbind RPC call
+ *
+ * RPC services invoke this function to advertise their contact
+ * information via the system's rpcbind daemon.  RPC services
+ * invoke this function once for each [program, version, address,
+ * netid] tuple they wish to advertise.
+ *
+ * Callers may also unregister RPC services that are no longer
+ * available by setting the port number in the passed-in address
+ * to zero.  Callers pass a netid of "" to unregister all
+ * transport netids associated with [program, version, address].
+ *
+ * Returns zero if the registration request was dispatched
+ * successfully and a reply was received.  The rpcbind daemon's
+ * result code is stored in *result.
+ *
+ * Returns an errno value and sets *result to zero if there was
+ * some problem that prevented the rpcbind request from being
+ * dispatched, or if the rpcbind daemon did not respond within
+ * the timeout.
+ *
+ * This function uses rpcbind protocol version 4 to contact the
+ * local rpcbind daemon.  The local rpcbind daemon must support
+ * version 4 of the rpcbind protocol in order for these functions
+ * to register a service successfully.
+ *
+ * Supported netids include "udp" and "tcp" for UDP and TCP over
+ * IPv4, and "udp6" and "tcp6" for UDP and TCP over IPv6,
+ * respectively.
+ *
+ * The contents of @address determine the address family and the
+ * port to be registered.  The usual practice is to pass INADDR_ANY
+ * as the raw address, but specifying a non-zero address is also
+ * supported by this API if the caller wishes to advertise an RPC
+ * service on a specific network interface.
+ *
+ * Note that passing in INADDR_ANY does not create the same service
+ * registration as IN6ADDR_ANY.  The former advertises an RPC
+ * service on any IPv4 address, but not on IPv6.  The latter
+ * advertises the service on all IPv4 and IPv6 addresses.
+ */
+int rpcb_v4_register(const u32 program, const u32 version,
+		     const struct sockaddr *address, const char *netid,
+		     int *result)
+{
+	struct rpcbind_args map = {
+		.r_prog		= program,
+		.r_vers		= version,
+		.r_netid	= netid,
+		.r_owner	= RPCB_OWNER_STRING,
+	};
+	struct rpc_message msg = {
+		.rpc_argp	= &map,
+		.rpc_resp	= result,
+	};
+
+	*result = 0;
+
+	switch (address->sa_family) {
+	case AF_INET:
+		return rpcb_register_netid4((struct sockaddr_in *)address,
+					    &msg);
+	case AF_INET6:
+		return rpcb_register_netid6((struct sockaddr_in6 *)address,
+					    &msg);
+	}
+
+	return -EAFNOSUPPORT;
 }
 
 /**
@@ -227,7 +435,7 @@ int rpcb_getport_sync(struct sockaddr_in *sin, u32 prog, u32 vers, int prot)
 		__func__, NIPQUAD(sin->sin_addr.s_addr), prog, vers, prot);
 
 	rpcb_clnt = rpcb_create(NULL, (struct sockaddr *)sin,
-				sizeof(*sin), prot, 2, 0);
+				sizeof(*sin), prot, RPCBVERS_2);
 	if (IS_ERR(rpcb_clnt))
 		return PTR_ERR(rpcb_clnt);
 
@@ -289,17 +497,16 @@ void rpcb_getport_async(struct rpc_task *task)
 	/* Autobind on cloned rpc clients is discouraged */
 	BUG_ON(clnt->cl_parent != clnt);
 
+	/* Put self on the wait queue to ensure we get notified if
+	 * some other task is already attempting to bind the port */
+	rpc_sleep_on(&xprt->binding, task, NULL);
+
 	if (xprt_test_and_set_binding(xprt)) {
-		status = -EAGAIN;	/* tell caller to check again */
 		dprintk("RPC: %5u %s: waiting for another binder\n",
 			task->tk_pid, __func__);
-		goto bailout_nowake;
+		return;
 	}
 
-	/* Put self on queue before sending rpcbind request, in case
-	 * rpcb_getport_done completes before we return from rpc_run_task */
-	rpc_sleep_on(&xprt->binding, task, NULL);
-
 	/* Someone else may have bound if we slept */
 	if (xprt_bound(xprt)) {
 		status = 0;
@@ -338,7 +545,7 @@ void rpcb_getport_async(struct rpc_task *task)
 		task->tk_pid, __func__, bind_version);
 
 	rpcb_clnt = rpcb_create(clnt->cl_server, sap, salen, xprt->prot,
-				bind_version, 0);
+				bind_version);
 	if (IS_ERR(rpcb_clnt)) {
 		status = PTR_ERR(rpcb_clnt);
 		dprintk("RPC: %5u %s: rpcb_create failed, error %ld\n",
@@ -361,15 +568,15 @@ void rpcb_getport_async(struct rpc_task *task)
 	map->r_netid = rpc_peeraddr2str(clnt, RPC_DISPLAY_NETID);
 	map->r_addr = rpc_peeraddr2str(rpcb_clnt, RPC_DISPLAY_UNIVERSAL_ADDR);
 	map->r_owner = RPCB_OWNER_STRING;	/* ignored for GETADDR */
+	map->r_status = -EIO;
 
 	child = rpcb_call_async(rpcb_clnt, map, proc);
 	rpc_release_client(rpcb_clnt);
 	if (IS_ERR(child)) {
-		status = -EIO;
 		/* rpcb_map_release() has freed the arguments */
 		dprintk("RPC: %5u %s: rpc_run_task failed\n",
 			task->tk_pid, __func__);
-		goto bailout_nofree;
+		return;
 	}
 	rpc_put_task(child);
 
@@ -378,7 +585,6 @@ void rpcb_getport_async(struct rpc_task *task)
 
 bailout_nofree:
 	rpcb_wake_rpcbind_waiters(xprt, status);
-bailout_nowake:
 	task->tk_status = status;
 }
 EXPORT_SYMBOL_GPL(rpcb_getport_async);
@@ -417,9 +623,13 @@ static void rpcb_getport_done(struct rpc_task *child, void *data)
 	dprintk("RPC: %5u rpcb_getport_done(status %d, port %u)\n",
 			child->tk_pid, status, map->r_port);
 
-	rpcb_wake_rpcbind_waiters(xprt, status);
+	map->r_status = status;
 }
 
+/*
+ * XDR functions for rpcbind
+ */
+
 static int rpcb_encode_mapping(struct rpc_rqst *req, __be32 *p,
 			       struct rpcbind_args *rpcb)
 {
@@ -438,7 +648,7 @@ static int rpcb_decode_getport(struct rpc_rqst *req, __be32 *p,
 			       unsigned short *portp)
 {
 	*portp = (unsigned short) ntohl(*p++);
-	dprintk("RPC:      rpcb_decode_getport result %u\n",
+	dprintk("RPC:       rpcb_decode_getport result %u\n",
 			*portp);
 	return 0;
 }
@@ -447,8 +657,8 @@ static int rpcb_decode_set(struct rpc_rqst *req, __be32 *p,
 			   unsigned int *boolp)
 {
 	*boolp = (unsigned int) ntohl(*p++);
-	dprintk("RPC:      rpcb_decode_set result %u\n",
-			*boolp);
+	dprintk("RPC:       rpcb_decode_set: call %s\n",
+			(*boolp ? "succeeded" : "failed"));
 	return 0;
 }
 
@@ -571,52 +781,60 @@ out_err:
 static struct rpc_procinfo rpcb_procedures2[] = {
 	PROC(SET,		mapping,	set),
 	PROC(UNSET,		mapping,	set),
-	PROC(GETADDR,		mapping,	getport),
+	PROC(GETPORT,		mapping,	getport),
 };
 
 static struct rpc_procinfo rpcb_procedures3[] = {
-	PROC(SET,		mapping,	set),
-	PROC(UNSET,		mapping,	set),
+	PROC(SET,		getaddr,	set),
+	PROC(UNSET,		getaddr,	set),
 	PROC(GETADDR,		getaddr,	getaddr),
 };
 
 static struct rpc_procinfo rpcb_procedures4[] = {
-	PROC(SET,		mapping,	set),
-	PROC(UNSET,		mapping,	set),
+	PROC(SET,		getaddr,	set),
+	PROC(UNSET,		getaddr,	set),
+	PROC(GETADDR,		getaddr,	getaddr),
 	PROC(GETVERSADDR,	getaddr,	getaddr),
 };
 
 static struct rpcb_info rpcb_next_version[] = {
-#ifdef CONFIG_SUNRPC_BIND34
-	{ 4, &rpcb_procedures4[RPCBPROC_GETVERSADDR] },
-	{ 3, &rpcb_procedures3[RPCBPROC_GETADDR] },
-#endif
-	{ 2, &rpcb_procedures2[RPCBPROC_GETPORT] },
-	{ 0, NULL },
+	{
+		.rpc_vers	= RPCBVERS_2,
+		.rpc_proc	= &rpcb_procedures2[RPCBPROC_GETPORT],
+	},
+	{
+		.rpc_proc	= NULL,
+	},
 };
 
 static struct rpcb_info rpcb_next_version6[] = {
-#ifdef CONFIG_SUNRPC_BIND34
-	{ 4, &rpcb_procedures4[RPCBPROC_GETVERSADDR] },
-	{ 3, &rpcb_procedures3[RPCBPROC_GETADDR] },
-#endif
-	{ 0, NULL },
+	{
+		.rpc_vers	= RPCBVERS_4,
+		.rpc_proc	= &rpcb_procedures4[RPCBPROC_GETADDR],
+	},
+	{
+		.rpc_vers	= RPCBVERS_3,
+		.rpc_proc	= &rpcb_procedures3[RPCBPROC_GETADDR],
+	},
+	{
+		.rpc_proc	= NULL,
+	},
 };
 
 static struct rpc_version rpcb_version2 = {
-	.number		= 2,
+	.number		= RPCBVERS_2,
 	.nrprocs	= RPCB_HIGHPROC_2,
 	.procs		= rpcb_procedures2
 };
 
 static struct rpc_version rpcb_version3 = {
-	.number		= 3,
+	.number		= RPCBVERS_3,
 	.nrprocs	= RPCB_HIGHPROC_3,
 	.procs		= rpcb_procedures3
 };
 
 static struct rpc_version rpcb_version4 = {
-	.number		= 4,
+	.number		= RPCBVERS_4,
 	.nrprocs	= RPCB_HIGHPROC_4,
 	.procs		= rpcb_procedures4
 };