2 * In-kernel rpcbind client supporting versions 2, 3, and 4 of the rpcbind
5 * Based on RFC 1833: "Binding Protocols for ONC RPC Version 2" and
6 * RFC 3530: "Network File System (NFS) version 4 Protocol"
8 * Original: Gilles Quillard, Bull Open Source, 2005 <gilles.quillard@bull.net>
9 * Updated: Chuck Lever, Oracle Corporation, 2007 <chuck.lever@oracle.com>
11 * Descended from net/sunrpc/pmap_clnt.c,
12 * Copyright (C) 1996, Olaf Kirch <okir@monad.swb.de>
15 #include <linux/module.h>
17 #include <linux/types.h>
18 #include <linux/socket.h>
21 #include <linux/in6.h>
22 #include <linux/kernel.h>
23 #include <linux/errno.h>
24 #include <linux/mutex.h>
25 #include <linux/slab.h>
28 #include <linux/sunrpc/clnt.h>
29 #include <linux/sunrpc/addr.h>
30 #include <linux/sunrpc/sched.h>
31 #include <linux/sunrpc/xprtsock.h>
36 # define RPCDBG_FACILITY RPCDBG_BIND
39 #define RPCBIND_SOCK_PATHNAME "/var/run/rpcbind.sock"
41 #define RPCBIND_PROGRAM (100000u)
42 #define RPCBIND_PORT (111u)
44 #define RPCBVERS_2 (2u)
45 #define RPCBVERS_3 (3u)
46 #define RPCBVERS_4 (4u)
53 RPCBPROC_GETADDR = 3, /* alias for GETPORT */
56 RPCBPROC_BCAST = 5, /* alias for CALLIT */
69 * The "owner" is allowed to unset a service in the rpcbind database.
71 * For AF_LOCAL SET/UNSET requests, rpcbind treats this string as a
72 * UID which it maps to a local user name via a password lookup.
73 * In all other cases it is ignored.
75 * For SET/UNSET requests, user space provides a value, even for
76 * network requests, and GETADDR uses an empty string. We follow
77 * those precedents here.
79 #define RPCB_OWNER_STRING "0"
80 #define RPCB_MAXOWNERLEN sizeof(RPCB_OWNER_STRING)
85 #define RPCB_program_sz (1)
86 #define RPCB_version_sz (1)
87 #define RPCB_protocol_sz (1)
88 #define RPCB_port_sz (1)
89 #define RPCB_boolean_sz (1)
91 #define RPCB_netid_sz (1 + XDR_QUADLEN(RPCBIND_MAXNETIDLEN))
92 #define RPCB_addr_sz (1 + XDR_QUADLEN(RPCBIND_MAXUADDRLEN))
93 #define RPCB_ownerstring_sz (1 + XDR_QUADLEN(RPCB_MAXOWNERLEN))
96 * XDR argument and result sizes
98 #define RPCB_mappingargs_sz (RPCB_program_sz + RPCB_version_sz + \
99 RPCB_protocol_sz + RPCB_port_sz)
100 #define RPCB_getaddrargs_sz (RPCB_program_sz + RPCB_version_sz + \
101 RPCB_netid_sz + RPCB_addr_sz + \
104 #define RPCB_getportres_sz RPCB_port_sz
105 #define RPCB_setres_sz RPCB_boolean_sz
108 * Note that RFC 1833 does not put any size restrictions on the
109 * address string returned by the remote rpcbind database.
111 #define RPCB_getaddrres_sz RPCB_addr_sz
113 static void rpcb_getport_done(struct rpc_task *, void *);
114 static void rpcb_map_release(void *data);
115 static const struct rpc_program rpcb_program;
117 struct rpcbind_args {
118 struct rpc_xprt * r_xprt;
123 unsigned short r_port;
124 const char * r_netid;
126 const char * r_owner;
131 static struct rpc_procinfo rpcb_procedures2[];
132 static struct rpc_procinfo rpcb_procedures3[];
133 static struct rpc_procinfo rpcb_procedures4[];
137 struct rpc_procinfo * rpc_proc;
140 static const struct rpcb_info rpcb_next_version[];
141 static const struct rpcb_info rpcb_next_version6[];
143 static const struct rpc_call_ops rpcb_getport_ops = {
144 .rpc_call_done = rpcb_getport_done,
145 .rpc_release = rpcb_map_release,
148 static void rpcb_wake_rpcbind_waiters(struct rpc_xprt *xprt, int status)
150 xprt_clear_binding(xprt);
151 rpc_wake_up_status(&xprt->binding, status);
154 static void rpcb_map_release(void *data)
156 struct rpcbind_args *map = data;
158 rpcb_wake_rpcbind_waiters(map->r_xprt, map->r_status);
159 xprt_put(map->r_xprt);
164 static int rpcb_get_local(struct net *net)
167 struct sunrpc_net *sn = net_generic(net, sunrpc_net_id);
169 spin_lock(&sn->rpcb_clnt_lock);
172 cnt = sn->rpcb_users;
173 spin_unlock(&sn->rpcb_clnt_lock);
178 void rpcb_put_local(struct net *net)
180 struct sunrpc_net *sn = net_generic(net, sunrpc_net_id);
181 struct rpc_clnt *clnt = sn->rpcb_local_clnt;
182 struct rpc_clnt *clnt4 = sn->rpcb_local_clnt4;
185 spin_lock(&sn->rpcb_clnt_lock);
186 if (sn->rpcb_users) {
187 if (--sn->rpcb_users == 0) {
188 sn->rpcb_local_clnt = NULL;
189 sn->rpcb_local_clnt4 = NULL;
191 shutdown = !sn->rpcb_users;
193 spin_unlock(&sn->rpcb_clnt_lock);
197 * cleanup_rpcb_clnt - remove xprtsock's sysctls, unregister
200 rpc_shutdown_client(clnt4);
202 rpc_shutdown_client(clnt);
206 static void rpcb_set_local(struct net *net, struct rpc_clnt *clnt,
207 struct rpc_clnt *clnt4)
209 struct sunrpc_net *sn = net_generic(net, sunrpc_net_id);
211 /* Protected by rpcb_create_local_mutex */
212 sn->rpcb_local_clnt = clnt;
213 sn->rpcb_local_clnt4 = clnt4;
216 dprintk("RPC: created new rpcb local clients (rpcb_local_clnt: "
217 "%p, rpcb_local_clnt4: %p) for net %p%s\n",
218 sn->rpcb_local_clnt, sn->rpcb_local_clnt4,
219 net, (net == &init_net) ? " (init_net)" : "");
223 * Returns zero on success, otherwise a negative errno value
226 static int rpcb_create_local_unix(struct net *net)
228 static const struct sockaddr_un rpcb_localaddr_rpcbind = {
229 .sun_family = AF_LOCAL,
230 .sun_path = RPCBIND_SOCK_PATHNAME,
232 struct rpc_create_args args = {
234 .protocol = XPRT_TRANSPORT_LOCAL,
235 .address = (struct sockaddr *)&rpcb_localaddr_rpcbind,
236 .addrsize = sizeof(rpcb_localaddr_rpcbind),
237 .servername = "localhost",
238 .program = &rpcb_program,
239 .version = RPCBVERS_2,
240 .authflavor = RPC_AUTH_NULL,
242 * We turn off the idle timeout to prevent the kernel
243 * from automatically disconnecting the socket.
244 * Otherwise, we'd have to cache the mount namespace
245 * of the caller and somehow pass that to the socket
248 .flags = RPC_CLNT_CREATE_NO_IDLE_TIMEOUT,
250 struct rpc_clnt *clnt, *clnt4;
254 * Because we requested an RPC PING at transport creation time,
255 * this works only if the user space portmapper is rpcbind, and
256 * it's listening on AF_LOCAL on the named socket.
258 clnt = rpc_create(&args);
260 dprintk("RPC: failed to create AF_LOCAL rpcbind "
261 "client (errno %ld).\n", PTR_ERR(clnt));
262 result = PTR_ERR(clnt);
266 clnt4 = rpc_bind_new_program(clnt, &rpcb_program, RPCBVERS_4);
268 dprintk("RPC: failed to bind second program to "
269 "rpcbind v4 client (errno %ld).\n",
274 rpcb_set_local(net, clnt, clnt4);
281 * Returns zero on success, otherwise a negative errno value
284 static int rpcb_create_local_net(struct net *net)
286 static const struct sockaddr_in rpcb_inaddr_loopback = {
287 .sin_family = AF_INET,
288 .sin_addr.s_addr = htonl(INADDR_LOOPBACK),
289 .sin_port = htons(RPCBIND_PORT),
291 struct rpc_create_args args = {
293 .protocol = XPRT_TRANSPORT_TCP,
294 .address = (struct sockaddr *)&rpcb_inaddr_loopback,
295 .addrsize = sizeof(rpcb_inaddr_loopback),
296 .servername = "localhost",
297 .program = &rpcb_program,
298 .version = RPCBVERS_2,
299 .authflavor = RPC_AUTH_UNIX,
300 .flags = RPC_CLNT_CREATE_NOPING,
302 struct rpc_clnt *clnt, *clnt4;
305 clnt = rpc_create(&args);
307 dprintk("RPC: failed to create local rpcbind "
308 "client (errno %ld).\n", PTR_ERR(clnt));
309 result = PTR_ERR(clnt);
314 * This results in an RPC ping. On systems running portmapper,
315 * the v4 ping will fail. Proceed anyway, but disallow rpcb
318 clnt4 = rpc_bind_new_program(clnt, &rpcb_program, RPCBVERS_4);
320 dprintk("RPC: failed to bind second program to "
321 "rpcbind v4 client (errno %ld).\n",
326 rpcb_set_local(net, clnt, clnt4);
333 * Returns zero on success, otherwise a negative errno value
336 int rpcb_create_local(struct net *net)
338 static DEFINE_MUTEX(rpcb_create_local_mutex);
341 if (rpcb_get_local(net))
344 mutex_lock(&rpcb_create_local_mutex);
345 if (rpcb_get_local(net))
348 if (rpcb_create_local_unix(net) != 0)
349 result = rpcb_create_local_net(net);
352 mutex_unlock(&rpcb_create_local_mutex);
356 static struct rpc_clnt *rpcb_create(struct net *net, const char *hostname,
357 struct sockaddr *srvaddr, size_t salen,
358 int proto, u32 version)
360 struct rpc_create_args args = {
365 .servername = hostname,
366 .program = &rpcb_program,
368 .authflavor = RPC_AUTH_UNIX,
369 .flags = (RPC_CLNT_CREATE_NOPING |
370 RPC_CLNT_CREATE_NONPRIVPORT),
373 switch (srvaddr->sa_family) {
375 ((struct sockaddr_in *)srvaddr)->sin_port = htons(RPCBIND_PORT);
378 ((struct sockaddr_in6 *)srvaddr)->sin6_port = htons(RPCBIND_PORT);
381 return ERR_PTR(-EAFNOSUPPORT);
384 return rpc_create(&args);
387 static int rpcb_register_call(struct rpc_clnt *clnt, struct rpc_message *msg)
389 int result, error = 0;
391 msg->rpc_resp = &result;
393 error = rpc_call_sync(clnt, msg, RPC_TASK_SOFTCONN);
395 dprintk("RPC: failed to contact local rpcbind "
396 "server (errno %d).\n", -error);
406 * rpcb_register - set or unset a port registration with the local rpcbind svc
407 * @net: target network namespace
408 * @prog: RPC program number to bind
409 * @vers: RPC version number to bind
410 * @prot: transport protocol to register
411 * @port: port value to register
413 * Returns zero if the registration request was dispatched successfully
414 * and the rpcbind daemon returned success. Otherwise, returns an errno
415 * value that reflects the nature of the error (request could not be
416 * dispatched, timed out, or rpcbind returned an error).
418 * RPC services invoke this function to advertise their contact
419 * information via the system's rpcbind daemon. RPC services
420 * invoke this function once for each [program, version, transport]
421 * tuple they wish to advertise.
423 * Callers may also unregister RPC services that are no longer
424 * available by setting the passed-in port to zero. This removes
425 * all registered transports for [program, version] from the local
428 * This function uses rpcbind protocol version 2 to contact the
429 * local rpcbind daemon.
431 * Registration works over both AF_INET and AF_INET6, and services
432 * registered via this function are advertised as available for any
433 * address. If the local rpcbind daemon is listening on AF_INET6,
434 * services registered via this function will be advertised on
435 * IN6ADDR_ANY (ie available for all AF_INET and AF_INET6
438 int rpcb_register(struct net *net, u32 prog, u32 vers, int prot, unsigned short port)
440 struct rpcbind_args map = {
446 struct rpc_message msg = {
449 struct sunrpc_net *sn = net_generic(net, sunrpc_net_id);
451 dprintk("RPC: %sregistering (%u, %u, %d, %u) with local "
452 "rpcbind\n", (port ? "" : "un"),
453 prog, vers, prot, port);
455 msg.rpc_proc = &rpcb_procedures2[RPCBPROC_UNSET];
457 msg.rpc_proc = &rpcb_procedures2[RPCBPROC_SET];
459 return rpcb_register_call(sn->rpcb_local_clnt, &msg);
463 * Fill in AF_INET family-specific arguments to register
465 static int rpcb_register_inet4(struct sunrpc_net *sn,
466 const struct sockaddr *sap,
467 struct rpc_message *msg)
469 const struct sockaddr_in *sin = (const struct sockaddr_in *)sap;
470 struct rpcbind_args *map = msg->rpc_argp;
471 unsigned short port = ntohs(sin->sin_port);
474 map->r_addr = rpc_sockaddr2uaddr(sap, GFP_KERNEL);
476 dprintk("RPC: %sregistering [%u, %u, %s, '%s'] with "
477 "local rpcbind\n", (port ? "" : "un"),
478 map->r_prog, map->r_vers,
479 map->r_addr, map->r_netid);
481 msg->rpc_proc = &rpcb_procedures4[RPCBPROC_UNSET];
483 msg->rpc_proc = &rpcb_procedures4[RPCBPROC_SET];
485 result = rpcb_register_call(sn->rpcb_local_clnt4, msg);
491 * Fill in AF_INET6 family-specific arguments to register
493 static int rpcb_register_inet6(struct sunrpc_net *sn,
494 const struct sockaddr *sap,
495 struct rpc_message *msg)
497 const struct sockaddr_in6 *sin6 = (const struct sockaddr_in6 *)sap;
498 struct rpcbind_args *map = msg->rpc_argp;
499 unsigned short port = ntohs(sin6->sin6_port);
502 map->r_addr = rpc_sockaddr2uaddr(sap, GFP_KERNEL);
504 dprintk("RPC: %sregistering [%u, %u, %s, '%s'] with "
505 "local rpcbind\n", (port ? "" : "un"),
506 map->r_prog, map->r_vers,
507 map->r_addr, map->r_netid);
509 msg->rpc_proc = &rpcb_procedures4[RPCBPROC_UNSET];
511 msg->rpc_proc = &rpcb_procedures4[RPCBPROC_SET];
513 result = rpcb_register_call(sn->rpcb_local_clnt4, msg);
518 static int rpcb_unregister_all_protofamilies(struct sunrpc_net *sn,
519 struct rpc_message *msg)
521 struct rpcbind_args *map = msg->rpc_argp;
523 dprintk("RPC: unregistering [%u, %u, '%s'] with "
525 map->r_prog, map->r_vers, map->r_netid);
528 msg->rpc_proc = &rpcb_procedures4[RPCBPROC_UNSET];
530 return rpcb_register_call(sn->rpcb_local_clnt4, msg);
534 * rpcb_v4_register - set or unset a port registration with the local rpcbind
535 * @net: target network namespace
536 * @program: RPC program number of service to (un)register
537 * @version: RPC version number of service to (un)register
538 * @address: address family, IP address, and port to (un)register
539 * @netid: netid of transport protocol to (un)register
541 * Returns zero if the registration request was dispatched successfully
542 * and the rpcbind daemon returned success. Otherwise, returns an errno
543 * value that reflects the nature of the error (request could not be
544 * dispatched, timed out, or rpcbind returned an error).
546 * RPC services invoke this function to advertise their contact
547 * information via the system's rpcbind daemon. RPC services
548 * invoke this function once for each [program, version, address,
549 * netid] tuple they wish to advertise.
551 * Callers may also unregister RPC services that are registered at a
552 * specific address by setting the port number in @address to zero.
553 * They may unregister all registered protocol families at once for
554 * a service by passing a NULL @address argument. If @netid is ""
555 * then all netids for [program, version, address] are unregistered.
557 * This function uses rpcbind protocol version 4 to contact the
558 * local rpcbind daemon. The local rpcbind daemon must support
559 * version 4 of the rpcbind protocol in order for these functions
560 * to register a service successfully.
562 * Supported netids include "udp" and "tcp" for UDP and TCP over
563 * IPv4, and "udp6" and "tcp6" for UDP and TCP over IPv6,
566 * The contents of @address determine the address family and the
567 * port to be registered. The usual practice is to pass INADDR_ANY
568 * as the raw address, but specifying a non-zero address is also
569 * supported by this API if the caller wishes to advertise an RPC
570 * service on a specific network interface.
572 * Note that passing in INADDR_ANY does not create the same service
573 * registration as IN6ADDR_ANY. The former advertises an RPC
574 * service on any IPv4 address, but not on IPv6. The latter
575 * advertises the service on all IPv4 and IPv6 addresses.
577 int rpcb_v4_register(struct net *net, const u32 program, const u32 version,
578 const struct sockaddr *address, const char *netid)
580 struct rpcbind_args map = {
584 .r_owner = RPCB_OWNER_STRING,
586 struct rpc_message msg = {
589 struct sunrpc_net *sn = net_generic(net, sunrpc_net_id);
591 if (sn->rpcb_local_clnt4 == NULL)
592 return -EPROTONOSUPPORT;
595 return rpcb_unregister_all_protofamilies(sn, &msg);
597 switch (address->sa_family) {
599 return rpcb_register_inet4(sn, address, &msg);
601 return rpcb_register_inet6(sn, address, &msg);
604 return -EAFNOSUPPORT;
607 static struct rpc_task *rpcb_call_async(struct rpc_clnt *rpcb_clnt, struct rpcbind_args *map, struct rpc_procinfo *proc)
609 struct rpc_message msg = {
614 struct rpc_task_setup task_setup_data = {
615 .rpc_client = rpcb_clnt,
617 .callback_ops = &rpcb_getport_ops,
618 .callback_data = map,
619 .flags = RPC_TASK_ASYNC | RPC_TASK_SOFTCONN,
622 return rpc_run_task(&task_setup_data);
626 * In the case where rpc clients have been cloned, we want to make
627 * sure that we use the program number/version etc of the actual
628 * owner of the xprt. To do so, we walk back up the tree of parents
629 * to find whoever created the transport and/or whoever has the
632 static struct rpc_clnt *rpcb_find_transport_owner(struct rpc_clnt *clnt)
634 struct rpc_clnt *parent = clnt->cl_parent;
635 struct rpc_xprt *xprt = rcu_dereference(clnt->cl_xprt);
637 while (parent != clnt) {
638 if (rcu_dereference(parent->cl_xprt) != xprt)
640 if (clnt->cl_autobind)
643 parent = parent->cl_parent;
649 * rpcb_getport_async - obtain the port for a given RPC service on a given host
650 * @task: task that is waiting for portmapper request
652 * This one can be called for an ongoing RPC request, and can be used in
653 * an async (rpciod) context.
655 void rpcb_getport_async(struct rpc_task *task)
657 struct rpc_clnt *clnt;
658 struct rpc_procinfo *proc;
660 struct rpc_xprt *xprt;
661 struct rpc_clnt *rpcb_clnt;
662 struct rpcbind_args *map;
663 struct rpc_task *child;
664 struct sockaddr_storage addr;
665 struct sockaddr *sap = (struct sockaddr *)&addr;
671 clnt = rpcb_find_transport_owner(task->tk_client);
672 xprt = xprt_get(rcu_dereference(clnt->cl_xprt));
673 } while (xprt == NULL);
676 dprintk("RPC: %5u %s(%s, %u, %u, %d)\n",
677 task->tk_pid, __func__,
678 xprt->servername, clnt->cl_prog, clnt->cl_vers, xprt->prot);
680 /* Put self on the wait queue to ensure we get notified if
681 * some other task is already attempting to bind the port */
682 rpc_sleep_on(&xprt->binding, task, NULL);
684 if (xprt_test_and_set_binding(xprt)) {
685 dprintk("RPC: %5u %s: waiting for another binder\n",
686 task->tk_pid, __func__);
691 /* Someone else may have bound if we slept */
692 if (xprt_bound(xprt)) {
694 dprintk("RPC: %5u %s: already bound\n",
695 task->tk_pid, __func__);
699 /* Parent transport's destination address */
700 salen = rpc_peeraddr(clnt, sap, sizeof(addr));
702 /* Don't ever use rpcbind v2 for AF_INET6 requests */
703 switch (sap->sa_family) {
705 proc = rpcb_next_version[xprt->bind_index].rpc_proc;
706 bind_version = rpcb_next_version[xprt->bind_index].rpc_vers;
709 proc = rpcb_next_version6[xprt->bind_index].rpc_proc;
710 bind_version = rpcb_next_version6[xprt->bind_index].rpc_vers;
713 status = -EAFNOSUPPORT;
714 dprintk("RPC: %5u %s: bad address family\n",
715 task->tk_pid, __func__);
719 xprt->bind_index = 0;
720 status = -EPFNOSUPPORT;
721 dprintk("RPC: %5u %s: no more getport versions available\n",
722 task->tk_pid, __func__);
726 dprintk("RPC: %5u %s: trying rpcbind version %u\n",
727 task->tk_pid, __func__, bind_version);
729 rpcb_clnt = rpcb_create(xprt->xprt_net, xprt->servername, sap, salen,
730 xprt->prot, bind_version);
731 if (IS_ERR(rpcb_clnt)) {
732 status = PTR_ERR(rpcb_clnt);
733 dprintk("RPC: %5u %s: rpcb_create failed, error %ld\n",
734 task->tk_pid, __func__, PTR_ERR(rpcb_clnt));
738 map = kzalloc(sizeof(struct rpcbind_args), GFP_ATOMIC);
741 dprintk("RPC: %5u %s: no memory available\n",
742 task->tk_pid, __func__);
743 goto bailout_release_client;
745 map->r_prog = clnt->cl_prog;
746 map->r_vers = clnt->cl_vers;
747 map->r_prot = xprt->prot;
750 map->r_status = -EIO;
752 switch (bind_version) {
755 map->r_netid = xprt->address_strings[RPC_DISPLAY_NETID];
756 map->r_addr = rpc_sockaddr2uaddr(sap, GFP_ATOMIC);
766 child = rpcb_call_async(rpcb_clnt, map, proc);
767 rpc_release_client(rpcb_clnt);
769 /* rpcb_map_release() has freed the arguments */
770 dprintk("RPC: %5u %s: rpc_run_task failed\n",
771 task->tk_pid, __func__);
775 xprt->stat.bind_count++;
779 bailout_release_client:
780 rpc_release_client(rpcb_clnt);
782 rpcb_wake_rpcbind_waiters(xprt, status);
783 task->tk_status = status;
786 EXPORT_SYMBOL_GPL(rpcb_getport_async);
789 * Rpcbind child task calls this callback via tk_exit.
791 static void rpcb_getport_done(struct rpc_task *child, void *data)
793 struct rpcbind_args *map = data;
794 struct rpc_xprt *xprt = map->r_xprt;
795 int status = child->tk_status;
797 /* Garbage reply: retry with a lesser rpcbind version */
799 status = -EPROTONOSUPPORT;
801 /* rpcbind server doesn't support this rpcbind protocol version */
802 if (status == -EPROTONOSUPPORT)
806 /* rpcbind server not available on remote host? */
807 xprt->ops->set_port(xprt, 0);
808 } else if (map->r_port == 0) {
809 /* Requested RPC service wasn't registered on remote host */
810 xprt->ops->set_port(xprt, 0);
814 xprt->ops->set_port(xprt, map->r_port);
815 xprt_set_bound(xprt);
819 dprintk("RPC: %5u rpcb_getport_done(status %d, port %u)\n",
820 child->tk_pid, status, map->r_port);
822 map->r_status = status;
826 * XDR functions for rpcbind
829 static void rpcb_enc_mapping(struct rpc_rqst *req, struct xdr_stream *xdr,
830 const struct rpcbind_args *rpcb)
834 dprintk("RPC: %5u encoding PMAP_%s call (%u, %u, %d, %u)\n",
835 req->rq_task->tk_pid,
836 req->rq_task->tk_msg.rpc_proc->p_name,
837 rpcb->r_prog, rpcb->r_vers, rpcb->r_prot, rpcb->r_port);
839 p = xdr_reserve_space(xdr, RPCB_mappingargs_sz << 2);
840 *p++ = cpu_to_be32(rpcb->r_prog);
841 *p++ = cpu_to_be32(rpcb->r_vers);
842 *p++ = cpu_to_be32(rpcb->r_prot);
843 *p = cpu_to_be32(rpcb->r_port);
846 static int rpcb_dec_getport(struct rpc_rqst *req, struct xdr_stream *xdr,
847 struct rpcbind_args *rpcb)
854 p = xdr_inline_decode(xdr, 4);
855 if (unlikely(p == NULL))
858 port = be32_to_cpup(p);
859 dprintk("RPC: %5u PMAP_%s result: %lu\n", req->rq_task->tk_pid,
860 req->rq_task->tk_msg.rpc_proc->p_name, port);
861 if (unlikely(port > USHRT_MAX))
868 static int rpcb_dec_set(struct rpc_rqst *req, struct xdr_stream *xdr,
873 p = xdr_inline_decode(xdr, 4);
874 if (unlikely(p == NULL))
881 dprintk("RPC: %5u RPCB_%s call %s\n",
882 req->rq_task->tk_pid,
883 req->rq_task->tk_msg.rpc_proc->p_name,
884 (*boolp ? "succeeded" : "failed"));
888 static void encode_rpcb_string(struct xdr_stream *xdr, const char *string,
894 len = strlen(string);
895 WARN_ON_ONCE(len > maxstrlen);
897 /* truncate and hope for the best */
899 p = xdr_reserve_space(xdr, 4 + len);
900 xdr_encode_opaque(p, string, len);
903 static void rpcb_enc_getaddr(struct rpc_rqst *req, struct xdr_stream *xdr,
904 const struct rpcbind_args *rpcb)
908 dprintk("RPC: %5u encoding RPCB_%s call (%u, %u, '%s', '%s')\n",
909 req->rq_task->tk_pid,
910 req->rq_task->tk_msg.rpc_proc->p_name,
911 rpcb->r_prog, rpcb->r_vers,
912 rpcb->r_netid, rpcb->r_addr);
914 p = xdr_reserve_space(xdr, (RPCB_program_sz + RPCB_version_sz) << 2);
915 *p++ = cpu_to_be32(rpcb->r_prog);
916 *p = cpu_to_be32(rpcb->r_vers);
918 encode_rpcb_string(xdr, rpcb->r_netid, RPCBIND_MAXNETIDLEN);
919 encode_rpcb_string(xdr, rpcb->r_addr, RPCBIND_MAXUADDRLEN);
920 encode_rpcb_string(xdr, rpcb->r_owner, RPCB_MAXOWNERLEN);
923 static int rpcb_dec_getaddr(struct rpc_rqst *req, struct xdr_stream *xdr,
924 struct rpcbind_args *rpcb)
926 struct sockaddr_storage address;
927 struct sockaddr *sap = (struct sockaddr *)&address;
933 p = xdr_inline_decode(xdr, 4);
934 if (unlikely(p == NULL))
936 len = be32_to_cpup(p);
939 * If the returned universal address is a null string,
940 * the requested RPC service was not registered.
943 dprintk("RPC: %5u RPCB reply: program not registered\n",
944 req->rq_task->tk_pid);
948 if (unlikely(len > RPCBIND_MAXUADDRLEN))
951 p = xdr_inline_decode(xdr, len);
952 if (unlikely(p == NULL))
954 dprintk("RPC: %5u RPCB_%s reply: %s\n", req->rq_task->tk_pid,
955 req->rq_task->tk_msg.rpc_proc->p_name, (char *)p);
957 if (rpc_uaddr2sockaddr(req->rq_xprt->xprt_net, (char *)p, len,
958 sap, sizeof(address)) == 0)
960 rpcb->r_port = rpc_get_port(sap);
965 dprintk("RPC: %5u malformed RPCB_%s reply\n",
966 req->rq_task->tk_pid,
967 req->rq_task->tk_msg.rpc_proc->p_name);
972 * Not all rpcbind procedures described in RFC 1833 are implemented
973 * since the Linux kernel RPC code requires only these.
976 static struct rpc_procinfo rpcb_procedures2[] = {
978 .p_proc = RPCBPROC_SET,
979 .p_encode = (kxdreproc_t)rpcb_enc_mapping,
980 .p_decode = (kxdrdproc_t)rpcb_dec_set,
981 .p_arglen = RPCB_mappingargs_sz,
982 .p_replen = RPCB_setres_sz,
983 .p_statidx = RPCBPROC_SET,
988 .p_proc = RPCBPROC_UNSET,
989 .p_encode = (kxdreproc_t)rpcb_enc_mapping,
990 .p_decode = (kxdrdproc_t)rpcb_dec_set,
991 .p_arglen = RPCB_mappingargs_sz,
992 .p_replen = RPCB_setres_sz,
993 .p_statidx = RPCBPROC_UNSET,
997 [RPCBPROC_GETPORT] = {
998 .p_proc = RPCBPROC_GETPORT,
999 .p_encode = (kxdreproc_t)rpcb_enc_mapping,
1000 .p_decode = (kxdrdproc_t)rpcb_dec_getport,
1001 .p_arglen = RPCB_mappingargs_sz,
1002 .p_replen = RPCB_getportres_sz,
1003 .p_statidx = RPCBPROC_GETPORT,
1005 .p_name = "GETPORT",
1009 static struct rpc_procinfo rpcb_procedures3[] = {
1011 .p_proc = RPCBPROC_SET,
1012 .p_encode = (kxdreproc_t)rpcb_enc_getaddr,
1013 .p_decode = (kxdrdproc_t)rpcb_dec_set,
1014 .p_arglen = RPCB_getaddrargs_sz,
1015 .p_replen = RPCB_setres_sz,
1016 .p_statidx = RPCBPROC_SET,
1020 [RPCBPROC_UNSET] = {
1021 .p_proc = RPCBPROC_UNSET,
1022 .p_encode = (kxdreproc_t)rpcb_enc_getaddr,
1023 .p_decode = (kxdrdproc_t)rpcb_dec_set,
1024 .p_arglen = RPCB_getaddrargs_sz,
1025 .p_replen = RPCB_setres_sz,
1026 .p_statidx = RPCBPROC_UNSET,
1030 [RPCBPROC_GETADDR] = {
1031 .p_proc = RPCBPROC_GETADDR,
1032 .p_encode = (kxdreproc_t)rpcb_enc_getaddr,
1033 .p_decode = (kxdrdproc_t)rpcb_dec_getaddr,
1034 .p_arglen = RPCB_getaddrargs_sz,
1035 .p_replen = RPCB_getaddrres_sz,
1036 .p_statidx = RPCBPROC_GETADDR,
1038 .p_name = "GETADDR",
1042 static struct rpc_procinfo rpcb_procedures4[] = {
1044 .p_proc = RPCBPROC_SET,
1045 .p_encode = (kxdreproc_t)rpcb_enc_getaddr,
1046 .p_decode = (kxdrdproc_t)rpcb_dec_set,
1047 .p_arglen = RPCB_getaddrargs_sz,
1048 .p_replen = RPCB_setres_sz,
1049 .p_statidx = RPCBPROC_SET,
1053 [RPCBPROC_UNSET] = {
1054 .p_proc = RPCBPROC_UNSET,
1055 .p_encode = (kxdreproc_t)rpcb_enc_getaddr,
1056 .p_decode = (kxdrdproc_t)rpcb_dec_set,
1057 .p_arglen = RPCB_getaddrargs_sz,
1058 .p_replen = RPCB_setres_sz,
1059 .p_statidx = RPCBPROC_UNSET,
1063 [RPCBPROC_GETADDR] = {
1064 .p_proc = RPCBPROC_GETADDR,
1065 .p_encode = (kxdreproc_t)rpcb_enc_getaddr,
1066 .p_decode = (kxdrdproc_t)rpcb_dec_getaddr,
1067 .p_arglen = RPCB_getaddrargs_sz,
1068 .p_replen = RPCB_getaddrres_sz,
1069 .p_statidx = RPCBPROC_GETADDR,
1071 .p_name = "GETADDR",
1075 static const struct rpcb_info rpcb_next_version[] = {
1077 .rpc_vers = RPCBVERS_2,
1078 .rpc_proc = &rpcb_procedures2[RPCBPROC_GETPORT],
1085 static const struct rpcb_info rpcb_next_version6[] = {
1087 .rpc_vers = RPCBVERS_4,
1088 .rpc_proc = &rpcb_procedures4[RPCBPROC_GETADDR],
1091 .rpc_vers = RPCBVERS_3,
1092 .rpc_proc = &rpcb_procedures3[RPCBPROC_GETADDR],
1099 static const struct rpc_version rpcb_version2 = {
1100 .number = RPCBVERS_2,
1101 .nrprocs = ARRAY_SIZE(rpcb_procedures2),
1102 .procs = rpcb_procedures2
1105 static const struct rpc_version rpcb_version3 = {
1106 .number = RPCBVERS_3,
1107 .nrprocs = ARRAY_SIZE(rpcb_procedures3),
1108 .procs = rpcb_procedures3
1111 static const struct rpc_version rpcb_version4 = {
1112 .number = RPCBVERS_4,
1113 .nrprocs = ARRAY_SIZE(rpcb_procedures4),
1114 .procs = rpcb_procedures4
1117 static const struct rpc_version *rpcb_version[] = {
1125 static struct rpc_stat rpcb_stats;
1127 static const struct rpc_program rpcb_program = {
1129 .number = RPCBIND_PROGRAM,
1130 .nrvers = ARRAY_SIZE(rpcb_version),
1131 .version = rpcb_version,
1132 .stats = &rpcb_stats,