1 // SPDX-License-Identifier: GPL-2.0-only
3 * In-kernel rpcbind client supporting versions 2, 3, and 4 of the rpcbind
6 * Based on RFC 1833: "Binding Protocols for ONC RPC Version 2" and
7 * RFC 3530: "Network File System (NFS) version 4 Protocol"
9 * Original: Gilles Quillard, Bull Open Source, 2005 <gilles.quillard@bull.net>
10 * Updated: Chuck Lever, Oracle Corporation, 2007 <chuck.lever@oracle.com>
12 * Descended from net/sunrpc/pmap_clnt.c,
13 * Copyright (C) 1996, Olaf Kirch <okir@monad.swb.de>
16 #include <linux/module.h>
18 #include <linux/types.h>
19 #include <linux/socket.h>
22 #include <linux/in6.h>
23 #include <linux/kernel.h>
24 #include <linux/errno.h>
25 #include <linux/mutex.h>
26 #include <linux/slab.h>
29 #include <linux/sunrpc/clnt.h>
30 #include <linux/sunrpc/addr.h>
31 #include <linux/sunrpc/sched.h>
32 #include <linux/sunrpc/xprtsock.h>
36 #if IS_ENABLED(CONFIG_SUNRPC_DEBUG)
37 # define RPCDBG_FACILITY RPCDBG_BIND
40 #define RPCBIND_SOCK_PATHNAME "/var/run/rpcbind.sock"
42 #define RPCBIND_PROGRAM (100000u)
43 #define RPCBIND_PORT (111u)
45 #define RPCBVERS_2 (2u)
46 #define RPCBVERS_3 (3u)
47 #define RPCBVERS_4 (4u)
54 RPCBPROC_GETADDR = 3, /* alias for GETPORT */
57 RPCBPROC_BCAST = 5, /* alias for CALLIT */
70 * The "owner" is allowed to unset a service in the rpcbind database.
72 * For AF_LOCAL SET/UNSET requests, rpcbind treats this string as a
73 * UID which it maps to a local user name via a password lookup.
74 * In all other cases it is ignored.
76 * For SET/UNSET requests, user space provides a value, even for
77 * network requests, and GETADDR uses an empty string. We follow
78 * those precedents here.
80 #define RPCB_OWNER_STRING "0"
81 #define RPCB_MAXOWNERLEN sizeof(RPCB_OWNER_STRING)
86 #define RPCB_program_sz (1)
87 #define RPCB_version_sz (1)
88 #define RPCB_protocol_sz (1)
89 #define RPCB_port_sz (1)
90 #define RPCB_boolean_sz (1)
92 #define RPCB_netid_sz (1 + XDR_QUADLEN(RPCBIND_MAXNETIDLEN))
93 #define RPCB_addr_sz (1 + XDR_QUADLEN(RPCBIND_MAXUADDRLEN))
94 #define RPCB_ownerstring_sz (1 + XDR_QUADLEN(RPCB_MAXOWNERLEN))
97 * XDR argument and result sizes
99 #define RPCB_mappingargs_sz (RPCB_program_sz + RPCB_version_sz + \
100 RPCB_protocol_sz + RPCB_port_sz)
101 #define RPCB_getaddrargs_sz (RPCB_program_sz + RPCB_version_sz + \
102 RPCB_netid_sz + RPCB_addr_sz + \
105 #define RPCB_getportres_sz RPCB_port_sz
106 #define RPCB_setres_sz RPCB_boolean_sz
109 * Note that RFC 1833 does not put any size restrictions on the
110 * address string returned by the remote rpcbind database.
112 #define RPCB_getaddrres_sz RPCB_addr_sz
114 static void rpcb_getport_done(struct rpc_task *, void *);
115 static void rpcb_map_release(void *data);
116 static const struct rpc_program rpcb_program;
118 struct rpcbind_args {
119 struct rpc_xprt * r_xprt;
124 unsigned short r_port;
125 const char * r_netid;
127 const char * r_owner;
132 static const struct rpc_procinfo rpcb_procedures2[];
133 static const struct rpc_procinfo rpcb_procedures3[];
134 static const struct rpc_procinfo rpcb_procedures4[];
138 const struct rpc_procinfo *rpc_proc;
141 static const struct rpcb_info rpcb_next_version[];
142 static const struct rpcb_info rpcb_next_version6[];
144 static const struct rpc_call_ops rpcb_getport_ops = {
145 .rpc_call_done = rpcb_getport_done,
146 .rpc_release = rpcb_map_release,
149 static void rpcb_wake_rpcbind_waiters(struct rpc_xprt *xprt, int status)
151 xprt_clear_binding(xprt);
152 rpc_wake_up_status(&xprt->binding, status);
155 static void rpcb_map_release(void *data)
157 struct rpcbind_args *map = data;
159 rpcb_wake_rpcbind_waiters(map->r_xprt, map->r_status);
160 xprt_put(map->r_xprt);
165 static int rpcb_get_local(struct net *net)
168 struct sunrpc_net *sn = net_generic(net, sunrpc_net_id);
170 spin_lock(&sn->rpcb_clnt_lock);
173 cnt = sn->rpcb_users;
174 spin_unlock(&sn->rpcb_clnt_lock);
179 void rpcb_put_local(struct net *net)
181 struct sunrpc_net *sn = net_generic(net, sunrpc_net_id);
182 struct rpc_clnt *clnt = sn->rpcb_local_clnt;
183 struct rpc_clnt *clnt4 = sn->rpcb_local_clnt4;
186 spin_lock(&sn->rpcb_clnt_lock);
187 if (sn->rpcb_users) {
188 if (--sn->rpcb_users == 0) {
189 sn->rpcb_local_clnt = NULL;
190 sn->rpcb_local_clnt4 = NULL;
192 shutdown = !sn->rpcb_users;
194 spin_unlock(&sn->rpcb_clnt_lock);
198 * cleanup_rpcb_clnt - remove xprtsock's sysctls, unregister
201 rpc_shutdown_client(clnt4);
203 rpc_shutdown_client(clnt);
207 static void rpcb_set_local(struct net *net, struct rpc_clnt *clnt,
208 struct rpc_clnt *clnt4,
211 struct sunrpc_net *sn = net_generic(net, sunrpc_net_id);
213 /* Protected by rpcb_create_local_mutex */
214 sn->rpcb_local_clnt = clnt;
215 sn->rpcb_local_clnt4 = clnt4;
216 sn->rpcb_is_af_local = is_af_local ? 1 : 0;
219 dprintk("RPC: created new rpcb local clients (rpcb_local_clnt: "
220 "%p, rpcb_local_clnt4: %p) for net %x%s\n",
221 sn->rpcb_local_clnt, sn->rpcb_local_clnt4,
222 net->ns.inum, (net == &init_net) ? " (init_net)" : "");
226 * Returns zero on success, otherwise a negative errno value
229 static int rpcb_create_local_unix(struct net *net)
231 static const struct sockaddr_un rpcb_localaddr_rpcbind = {
232 .sun_family = AF_LOCAL,
233 .sun_path = RPCBIND_SOCK_PATHNAME,
235 struct rpc_create_args args = {
237 .protocol = XPRT_TRANSPORT_LOCAL,
238 .address = (struct sockaddr *)&rpcb_localaddr_rpcbind,
239 .addrsize = sizeof(rpcb_localaddr_rpcbind),
240 .servername = "localhost",
241 .program = &rpcb_program,
242 .version = RPCBVERS_2,
243 .authflavor = RPC_AUTH_NULL,
244 .cred = current_cred(),
246 * We turn off the idle timeout to prevent the kernel
247 * from automatically disconnecting the socket.
248 * Otherwise, we'd have to cache the mount namespace
249 * of the caller and somehow pass that to the socket
252 .flags = RPC_CLNT_CREATE_NO_IDLE_TIMEOUT,
254 struct rpc_clnt *clnt, *clnt4;
258 * Because we requested an RPC PING at transport creation time,
259 * this works only if the user space portmapper is rpcbind, and
260 * it's listening on AF_LOCAL on the named socket.
262 clnt = rpc_create(&args);
264 dprintk("RPC: failed to create AF_LOCAL rpcbind "
265 "client (errno %ld).\n", PTR_ERR(clnt));
266 result = PTR_ERR(clnt);
270 clnt4 = rpc_bind_new_program(clnt, &rpcb_program, RPCBVERS_4);
272 dprintk("RPC: failed to bind second program to "
273 "rpcbind v4 client (errno %ld).\n",
278 rpcb_set_local(net, clnt, clnt4, true);
285 * Returns zero on success, otherwise a negative errno value
288 static int rpcb_create_local_net(struct net *net)
290 static const struct sockaddr_in rpcb_inaddr_loopback = {
291 .sin_family = AF_INET,
292 .sin_addr.s_addr = htonl(INADDR_LOOPBACK),
293 .sin_port = htons(RPCBIND_PORT),
295 struct rpc_create_args args = {
297 .protocol = XPRT_TRANSPORT_TCP,
298 .address = (struct sockaddr *)&rpcb_inaddr_loopback,
299 .addrsize = sizeof(rpcb_inaddr_loopback),
300 .servername = "localhost",
301 .program = &rpcb_program,
302 .version = RPCBVERS_2,
303 .authflavor = RPC_AUTH_UNIX,
304 .cred = current_cred(),
305 .flags = RPC_CLNT_CREATE_NOPING,
307 struct rpc_clnt *clnt, *clnt4;
310 clnt = rpc_create(&args);
312 dprintk("RPC: failed to create local rpcbind "
313 "client (errno %ld).\n", PTR_ERR(clnt));
314 result = PTR_ERR(clnt);
319 * This results in an RPC ping. On systems running portmapper,
320 * the v4 ping will fail. Proceed anyway, but disallow rpcb
323 clnt4 = rpc_bind_new_program(clnt, &rpcb_program, RPCBVERS_4);
325 dprintk("RPC: failed to bind second program to "
326 "rpcbind v4 client (errno %ld).\n",
331 rpcb_set_local(net, clnt, clnt4, false);
338 * Returns zero on success, otherwise a negative errno value
341 int rpcb_create_local(struct net *net)
343 static DEFINE_MUTEX(rpcb_create_local_mutex);
346 if (rpcb_get_local(net))
349 mutex_lock(&rpcb_create_local_mutex);
350 if (rpcb_get_local(net))
353 if (rpcb_create_local_unix(net) != 0)
354 result = rpcb_create_local_net(net);
357 mutex_unlock(&rpcb_create_local_mutex);
361 static struct rpc_clnt *rpcb_create(struct net *net, const char *nodename,
362 const char *hostname,
363 struct sockaddr *srvaddr, size_t salen,
364 int proto, u32 version,
365 const struct cred *cred)
367 struct rpc_create_args args = {
372 .servername = hostname,
373 .nodename = nodename,
374 .program = &rpcb_program,
376 .authflavor = RPC_AUTH_UNIX,
378 .flags = (RPC_CLNT_CREATE_NOPING |
379 RPC_CLNT_CREATE_NONPRIVPORT),
382 switch (srvaddr->sa_family) {
384 ((struct sockaddr_in *)srvaddr)->sin_port = htons(RPCBIND_PORT);
387 ((struct sockaddr_in6 *)srvaddr)->sin6_port = htons(RPCBIND_PORT);
390 return ERR_PTR(-EAFNOSUPPORT);
393 return rpc_create(&args);
396 static int rpcb_register_call(struct sunrpc_net *sn, struct rpc_clnt *clnt, struct rpc_message *msg, bool is_set)
398 int flags = RPC_TASK_NOCONNECT;
399 int error, result = 0;
401 if (is_set || !sn->rpcb_is_af_local)
402 flags = RPC_TASK_SOFTCONN;
403 msg->rpc_resp = &result;
405 error = rpc_call_sync(clnt, msg, flags);
407 dprintk("RPC: failed to contact local rpcbind "
408 "server (errno %d).\n", -error);
418 * rpcb_register - set or unset a port registration with the local rpcbind svc
419 * @net: target network namespace
420 * @prog: RPC program number to bind
421 * @vers: RPC version number to bind
422 * @prot: transport protocol to register
423 * @port: port value to register
425 * Returns zero if the registration request was dispatched successfully
426 * and the rpcbind daemon returned success. Otherwise, returns an errno
427 * value that reflects the nature of the error (request could not be
428 * dispatched, timed out, or rpcbind returned an error).
430 * RPC services invoke this function to advertise their contact
431 * information via the system's rpcbind daemon. RPC services
432 * invoke this function once for each [program, version, transport]
433 * tuple they wish to advertise.
435 * Callers may also unregister RPC services that are no longer
436 * available by setting the passed-in port to zero. This removes
437 * all registered transports for [program, version] from the local
440 * This function uses rpcbind protocol version 2 to contact the
441 * local rpcbind daemon.
443 * Registration works over both AF_INET and AF_INET6, and services
444 * registered via this function are advertised as available for any
445 * address. If the local rpcbind daemon is listening on AF_INET6,
446 * services registered via this function will be advertised on
447 * IN6ADDR_ANY (ie available for all AF_INET and AF_INET6
450 int rpcb_register(struct net *net, u32 prog, u32 vers, int prot, unsigned short port)
452 struct rpcbind_args map = {
458 struct rpc_message msg = {
461 struct sunrpc_net *sn = net_generic(net, sunrpc_net_id);
464 dprintk("RPC: %sregistering (%u, %u, %d, %u) with local "
465 "rpcbind\n", (port ? "" : "un"),
466 prog, vers, prot, port);
468 msg.rpc_proc = &rpcb_procedures2[RPCBPROC_UNSET];
470 msg.rpc_proc = &rpcb_procedures2[RPCBPROC_SET];
474 return rpcb_register_call(sn, sn->rpcb_local_clnt, &msg, is_set);
478 * Fill in AF_INET family-specific arguments to register
480 static int rpcb_register_inet4(struct sunrpc_net *sn,
481 const struct sockaddr *sap,
482 struct rpc_message *msg)
484 const struct sockaddr_in *sin = (const struct sockaddr_in *)sap;
485 struct rpcbind_args *map = msg->rpc_argp;
486 unsigned short port = ntohs(sin->sin_port);
490 map->r_addr = rpc_sockaddr2uaddr(sap, GFP_KERNEL);
492 dprintk("RPC: %sregistering [%u, %u, %s, '%s'] with "
493 "local rpcbind\n", (port ? "" : "un"),
494 map->r_prog, map->r_vers,
495 map->r_addr, map->r_netid);
497 msg->rpc_proc = &rpcb_procedures4[RPCBPROC_UNSET];
499 msg->rpc_proc = &rpcb_procedures4[RPCBPROC_SET];
503 result = rpcb_register_call(sn, sn->rpcb_local_clnt4, msg, is_set);
509 * Fill in AF_INET6 family-specific arguments to register
511 static int rpcb_register_inet6(struct sunrpc_net *sn,
512 const struct sockaddr *sap,
513 struct rpc_message *msg)
515 const struct sockaddr_in6 *sin6 = (const struct sockaddr_in6 *)sap;
516 struct rpcbind_args *map = msg->rpc_argp;
517 unsigned short port = ntohs(sin6->sin6_port);
521 map->r_addr = rpc_sockaddr2uaddr(sap, GFP_KERNEL);
523 dprintk("RPC: %sregistering [%u, %u, %s, '%s'] with "
524 "local rpcbind\n", (port ? "" : "un"),
525 map->r_prog, map->r_vers,
526 map->r_addr, map->r_netid);
528 msg->rpc_proc = &rpcb_procedures4[RPCBPROC_UNSET];
530 msg->rpc_proc = &rpcb_procedures4[RPCBPROC_SET];
534 result = rpcb_register_call(sn, sn->rpcb_local_clnt4, msg, is_set);
539 static int rpcb_unregister_all_protofamilies(struct sunrpc_net *sn,
540 struct rpc_message *msg)
542 struct rpcbind_args *map = msg->rpc_argp;
544 dprintk("RPC: unregistering [%u, %u, '%s'] with "
546 map->r_prog, map->r_vers, map->r_netid);
549 msg->rpc_proc = &rpcb_procedures4[RPCBPROC_UNSET];
551 return rpcb_register_call(sn, sn->rpcb_local_clnt4, msg, false);
555 * rpcb_v4_register - set or unset a port registration with the local rpcbind
556 * @net: target network namespace
557 * @program: RPC program number of service to (un)register
558 * @version: RPC version number of service to (un)register
559 * @address: address family, IP address, and port to (un)register
560 * @netid: netid of transport protocol to (un)register
562 * Returns zero if the registration request was dispatched successfully
563 * and the rpcbind daemon returned success. Otherwise, returns an errno
564 * value that reflects the nature of the error (request could not be
565 * dispatched, timed out, or rpcbind returned an error).
567 * RPC services invoke this function to advertise their contact
568 * information via the system's rpcbind daemon. RPC services
569 * invoke this function once for each [program, version, address,
570 * netid] tuple they wish to advertise.
572 * Callers may also unregister RPC services that are registered at a
573 * specific address by setting the port number in @address to zero.
574 * They may unregister all registered protocol families at once for
575 * a service by passing a NULL @address argument. If @netid is ""
576 * then all netids for [program, version, address] are unregistered.
578 * This function uses rpcbind protocol version 4 to contact the
579 * local rpcbind daemon. The local rpcbind daemon must support
580 * version 4 of the rpcbind protocol in order for these functions
581 * to register a service successfully.
583 * Supported netids include "udp" and "tcp" for UDP and TCP over
584 * IPv4, and "udp6" and "tcp6" for UDP and TCP over IPv6,
587 * The contents of @address determine the address family and the
588 * port to be registered. The usual practice is to pass INADDR_ANY
589 * as the raw address, but specifying a non-zero address is also
590 * supported by this API if the caller wishes to advertise an RPC
591 * service on a specific network interface.
593 * Note that passing in INADDR_ANY does not create the same service
594 * registration as IN6ADDR_ANY. The former advertises an RPC
595 * service on any IPv4 address, but not on IPv6. The latter
596 * advertises the service on all IPv4 and IPv6 addresses.
598 int rpcb_v4_register(struct net *net, const u32 program, const u32 version,
599 const struct sockaddr *address, const char *netid)
601 struct rpcbind_args map = {
605 .r_owner = RPCB_OWNER_STRING,
607 struct rpc_message msg = {
610 struct sunrpc_net *sn = net_generic(net, sunrpc_net_id);
612 if (sn->rpcb_local_clnt4 == NULL)
613 return -EPROTONOSUPPORT;
616 return rpcb_unregister_all_protofamilies(sn, &msg);
618 switch (address->sa_family) {
620 return rpcb_register_inet4(sn, address, &msg);
622 return rpcb_register_inet6(sn, address, &msg);
625 return -EAFNOSUPPORT;
628 static struct rpc_task *rpcb_call_async(struct rpc_clnt *rpcb_clnt,
629 struct rpcbind_args *map, const struct rpc_procinfo *proc)
631 struct rpc_message msg = {
636 struct rpc_task_setup task_setup_data = {
637 .rpc_client = rpcb_clnt,
639 .callback_ops = &rpcb_getport_ops,
640 .callback_data = map,
641 .flags = RPC_TASK_ASYNC | RPC_TASK_SOFTCONN,
644 return rpc_run_task(&task_setup_data);
648 * In the case where rpc clients have been cloned, we want to make
649 * sure that we use the program number/version etc of the actual
650 * owner of the xprt. To do so, we walk back up the tree of parents
651 * to find whoever created the transport and/or whoever has the
654 static struct rpc_clnt *rpcb_find_transport_owner(struct rpc_clnt *clnt)
656 struct rpc_clnt *parent = clnt->cl_parent;
657 struct rpc_xprt_switch *xps = rcu_access_pointer(clnt->cl_xpi.xpi_xpswitch);
659 while (parent != clnt) {
660 if (rcu_access_pointer(parent->cl_xpi.xpi_xpswitch) != xps)
662 if (clnt->cl_autobind)
665 parent = parent->cl_parent;
671 * rpcb_getport_async - obtain the port for a given RPC service on a given host
672 * @task: task that is waiting for portmapper request
674 * This one can be called for an ongoing RPC request, and can be used in
675 * an async (rpciod) context.
677 void rpcb_getport_async(struct rpc_task *task)
679 struct rpc_clnt *clnt;
680 const struct rpc_procinfo *proc;
682 struct rpc_xprt *xprt;
683 struct rpc_clnt *rpcb_clnt;
684 struct rpcbind_args *map;
685 struct rpc_task *child;
686 struct sockaddr_storage addr;
687 struct sockaddr *sap = (struct sockaddr *)&addr;
692 clnt = rpcb_find_transport_owner(task->tk_client);
694 xprt = xprt_get(task->tk_xprt);
696 dprintk("RPC: %5u %s(%s, %u, %u, %d)\n",
697 task->tk_pid, __func__,
698 xprt->servername, clnt->cl_prog, clnt->cl_vers, xprt->prot);
700 /* Put self on the wait queue to ensure we get notified if
701 * some other task is already attempting to bind the port */
702 rpc_sleep_on_timeout(&xprt->binding, task,
703 NULL, jiffies + xprt->bind_timeout);
705 if (xprt_test_and_set_binding(xprt)) {
706 dprintk("RPC: %5u %s: waiting for another binder\n",
707 task->tk_pid, __func__);
712 /* Someone else may have bound if we slept */
713 if (xprt_bound(xprt)) {
715 dprintk("RPC: %5u %s: already bound\n",
716 task->tk_pid, __func__);
720 /* Parent transport's destination address */
721 salen = rpc_peeraddr(clnt, sap, sizeof(addr));
723 /* Don't ever use rpcbind v2 for AF_INET6 requests */
724 switch (sap->sa_family) {
726 proc = rpcb_next_version[xprt->bind_index].rpc_proc;
727 bind_version = rpcb_next_version[xprt->bind_index].rpc_vers;
730 proc = rpcb_next_version6[xprt->bind_index].rpc_proc;
731 bind_version = rpcb_next_version6[xprt->bind_index].rpc_vers;
734 status = -EAFNOSUPPORT;
735 dprintk("RPC: %5u %s: bad address family\n",
736 task->tk_pid, __func__);
740 xprt->bind_index = 0;
741 status = -EPFNOSUPPORT;
742 dprintk("RPC: %5u %s: no more getport versions available\n",
743 task->tk_pid, __func__);
747 dprintk("RPC: %5u %s: trying rpcbind version %u\n",
748 task->tk_pid, __func__, bind_version);
750 rpcb_clnt = rpcb_create(xprt->xprt_net,
752 xprt->servername, sap, salen,
753 xprt->prot, bind_version,
755 if (IS_ERR(rpcb_clnt)) {
756 status = PTR_ERR(rpcb_clnt);
757 dprintk("RPC: %5u %s: rpcb_create failed, error %ld\n",
758 task->tk_pid, __func__, PTR_ERR(rpcb_clnt));
762 map = kzalloc(sizeof(struct rpcbind_args), GFP_NOFS);
765 dprintk("RPC: %5u %s: no memory available\n",
766 task->tk_pid, __func__);
767 goto bailout_release_client;
769 map->r_prog = clnt->cl_prog;
770 map->r_vers = clnt->cl_vers;
771 map->r_prot = xprt->prot;
774 map->r_status = -EIO;
776 switch (bind_version) {
779 map->r_netid = xprt->address_strings[RPC_DISPLAY_NETID];
780 map->r_addr = rpc_sockaddr2uaddr(sap, GFP_NOFS);
783 dprintk("RPC: %5u %s: no memory available\n",
784 task->tk_pid, __func__);
785 goto bailout_free_args;
796 child = rpcb_call_async(rpcb_clnt, map, proc);
797 rpc_release_client(rpcb_clnt);
799 /* rpcb_map_release() has freed the arguments */
800 dprintk("RPC: %5u %s: rpc_run_task failed\n",
801 task->tk_pid, __func__);
805 xprt->stat.bind_count++;
811 bailout_release_client:
812 rpc_release_client(rpcb_clnt);
814 rpcb_wake_rpcbind_waiters(xprt, status);
815 task->tk_status = status;
818 EXPORT_SYMBOL_GPL(rpcb_getport_async);
821 * Rpcbind child task calls this callback via tk_exit.
823 static void rpcb_getport_done(struct rpc_task *child, void *data)
825 struct rpcbind_args *map = data;
826 struct rpc_xprt *xprt = map->r_xprt;
827 int status = child->tk_status;
829 /* Garbage reply: retry with a lesser rpcbind version */
831 status = -EPROTONOSUPPORT;
833 /* rpcbind server doesn't support this rpcbind protocol version */
834 if (status == -EPROTONOSUPPORT)
838 /* rpcbind server not available on remote host? */
839 xprt->ops->set_port(xprt, 0);
840 } else if (map->r_port == 0) {
841 /* Requested RPC service wasn't registered on remote host */
842 xprt->ops->set_port(xprt, 0);
846 xprt->ops->set_port(xprt, map->r_port);
847 xprt_set_bound(xprt);
851 dprintk("RPC: %5u rpcb_getport_done(status %d, port %u)\n",
852 child->tk_pid, status, map->r_port);
854 map->r_status = status;
858 * XDR functions for rpcbind
861 static void rpcb_enc_mapping(struct rpc_rqst *req, struct xdr_stream *xdr,
864 const struct rpcbind_args *rpcb = data;
867 dprintk("RPC: %5u encoding PMAP_%s call (%u, %u, %d, %u)\n",
868 req->rq_task->tk_pid,
869 req->rq_task->tk_msg.rpc_proc->p_name,
870 rpcb->r_prog, rpcb->r_vers, rpcb->r_prot, rpcb->r_port);
872 p = xdr_reserve_space(xdr, RPCB_mappingargs_sz << 2);
873 *p++ = cpu_to_be32(rpcb->r_prog);
874 *p++ = cpu_to_be32(rpcb->r_vers);
875 *p++ = cpu_to_be32(rpcb->r_prot);
876 *p = cpu_to_be32(rpcb->r_port);
879 static int rpcb_dec_getport(struct rpc_rqst *req, struct xdr_stream *xdr,
882 struct rpcbind_args *rpcb = data;
888 p = xdr_inline_decode(xdr, 4);
889 if (unlikely(p == NULL))
892 port = be32_to_cpup(p);
893 dprintk("RPC: %5u PMAP_%s result: %lu\n", req->rq_task->tk_pid,
894 req->rq_task->tk_msg.rpc_proc->p_name, port);
895 if (unlikely(port > USHRT_MAX))
902 static int rpcb_dec_set(struct rpc_rqst *req, struct xdr_stream *xdr,
905 unsigned int *boolp = data;
908 p = xdr_inline_decode(xdr, 4);
909 if (unlikely(p == NULL))
916 dprintk("RPC: %5u RPCB_%s call %s\n",
917 req->rq_task->tk_pid,
918 req->rq_task->tk_msg.rpc_proc->p_name,
919 (*boolp ? "succeeded" : "failed"));
923 static void encode_rpcb_string(struct xdr_stream *xdr, const char *string,
929 len = strlen(string);
930 WARN_ON_ONCE(len > maxstrlen);
932 /* truncate and hope for the best */
934 p = xdr_reserve_space(xdr, 4 + len);
935 xdr_encode_opaque(p, string, len);
938 static void rpcb_enc_getaddr(struct rpc_rqst *req, struct xdr_stream *xdr,
941 const struct rpcbind_args *rpcb = data;
944 dprintk("RPC: %5u encoding RPCB_%s call (%u, %u, '%s', '%s')\n",
945 req->rq_task->tk_pid,
946 req->rq_task->tk_msg.rpc_proc->p_name,
947 rpcb->r_prog, rpcb->r_vers,
948 rpcb->r_netid, rpcb->r_addr);
950 p = xdr_reserve_space(xdr, (RPCB_program_sz + RPCB_version_sz) << 2);
951 *p++ = cpu_to_be32(rpcb->r_prog);
952 *p = cpu_to_be32(rpcb->r_vers);
954 encode_rpcb_string(xdr, rpcb->r_netid, RPCBIND_MAXNETIDLEN);
955 encode_rpcb_string(xdr, rpcb->r_addr, RPCBIND_MAXUADDRLEN);
956 encode_rpcb_string(xdr, rpcb->r_owner, RPCB_MAXOWNERLEN);
959 static int rpcb_dec_getaddr(struct rpc_rqst *req, struct xdr_stream *xdr,
962 struct rpcbind_args *rpcb = data;
963 struct sockaddr_storage address;
964 struct sockaddr *sap = (struct sockaddr *)&address;
970 p = xdr_inline_decode(xdr, 4);
971 if (unlikely(p == NULL))
973 len = be32_to_cpup(p);
976 * If the returned universal address is a null string,
977 * the requested RPC service was not registered.
980 dprintk("RPC: %5u RPCB reply: program not registered\n",
981 req->rq_task->tk_pid);
985 if (unlikely(len > RPCBIND_MAXUADDRLEN))
988 p = xdr_inline_decode(xdr, len);
989 if (unlikely(p == NULL))
991 dprintk("RPC: %5u RPCB_%s reply: %*pE\n", req->rq_task->tk_pid,
992 req->rq_task->tk_msg.rpc_proc->p_name, len, (char *)p);
994 if (rpc_uaddr2sockaddr(req->rq_xprt->xprt_net, (char *)p, len,
995 sap, sizeof(address)) == 0)
997 rpcb->r_port = rpc_get_port(sap);
1002 dprintk("RPC: %5u malformed RPCB_%s reply\n",
1003 req->rq_task->tk_pid,
1004 req->rq_task->tk_msg.rpc_proc->p_name);
1009 * Not all rpcbind procedures described in RFC 1833 are implemented
1010 * since the Linux kernel RPC code requires only these.
1013 static const struct rpc_procinfo rpcb_procedures2[] = {
1015 .p_proc = RPCBPROC_SET,
1016 .p_encode = rpcb_enc_mapping,
1017 .p_decode = rpcb_dec_set,
1018 .p_arglen = RPCB_mappingargs_sz,
1019 .p_replen = RPCB_setres_sz,
1020 .p_statidx = RPCBPROC_SET,
1024 [RPCBPROC_UNSET] = {
1025 .p_proc = RPCBPROC_UNSET,
1026 .p_encode = rpcb_enc_mapping,
1027 .p_decode = rpcb_dec_set,
1028 .p_arglen = RPCB_mappingargs_sz,
1029 .p_replen = RPCB_setres_sz,
1030 .p_statidx = RPCBPROC_UNSET,
1034 [RPCBPROC_GETPORT] = {
1035 .p_proc = RPCBPROC_GETPORT,
1036 .p_encode = rpcb_enc_mapping,
1037 .p_decode = rpcb_dec_getport,
1038 .p_arglen = RPCB_mappingargs_sz,
1039 .p_replen = RPCB_getportres_sz,
1040 .p_statidx = RPCBPROC_GETPORT,
1042 .p_name = "GETPORT",
1046 static const struct rpc_procinfo rpcb_procedures3[] = {
1048 .p_proc = RPCBPROC_SET,
1049 .p_encode = rpcb_enc_getaddr,
1050 .p_decode = rpcb_dec_set,
1051 .p_arglen = RPCB_getaddrargs_sz,
1052 .p_replen = RPCB_setres_sz,
1053 .p_statidx = RPCBPROC_SET,
1057 [RPCBPROC_UNSET] = {
1058 .p_proc = RPCBPROC_UNSET,
1059 .p_encode = rpcb_enc_getaddr,
1060 .p_decode = rpcb_dec_set,
1061 .p_arglen = RPCB_getaddrargs_sz,
1062 .p_replen = RPCB_setres_sz,
1063 .p_statidx = RPCBPROC_UNSET,
1067 [RPCBPROC_GETADDR] = {
1068 .p_proc = RPCBPROC_GETADDR,
1069 .p_encode = rpcb_enc_getaddr,
1070 .p_decode = rpcb_dec_getaddr,
1071 .p_arglen = RPCB_getaddrargs_sz,
1072 .p_replen = RPCB_getaddrres_sz,
1073 .p_statidx = RPCBPROC_GETADDR,
1075 .p_name = "GETADDR",
1079 static const struct rpc_procinfo rpcb_procedures4[] = {
1081 .p_proc = RPCBPROC_SET,
1082 .p_encode = rpcb_enc_getaddr,
1083 .p_decode = rpcb_dec_set,
1084 .p_arglen = RPCB_getaddrargs_sz,
1085 .p_replen = RPCB_setres_sz,
1086 .p_statidx = RPCBPROC_SET,
1090 [RPCBPROC_UNSET] = {
1091 .p_proc = RPCBPROC_UNSET,
1092 .p_encode = rpcb_enc_getaddr,
1093 .p_decode = rpcb_dec_set,
1094 .p_arglen = RPCB_getaddrargs_sz,
1095 .p_replen = RPCB_setres_sz,
1096 .p_statidx = RPCBPROC_UNSET,
1100 [RPCBPROC_GETADDR] = {
1101 .p_proc = RPCBPROC_GETADDR,
1102 .p_encode = rpcb_enc_getaddr,
1103 .p_decode = rpcb_dec_getaddr,
1104 .p_arglen = RPCB_getaddrargs_sz,
1105 .p_replen = RPCB_getaddrres_sz,
1106 .p_statidx = RPCBPROC_GETADDR,
1108 .p_name = "GETADDR",
1112 static const struct rpcb_info rpcb_next_version[] = {
1114 .rpc_vers = RPCBVERS_2,
1115 .rpc_proc = &rpcb_procedures2[RPCBPROC_GETPORT],
1122 static const struct rpcb_info rpcb_next_version6[] = {
1124 .rpc_vers = RPCBVERS_4,
1125 .rpc_proc = &rpcb_procedures4[RPCBPROC_GETADDR],
1128 .rpc_vers = RPCBVERS_3,
1129 .rpc_proc = &rpcb_procedures3[RPCBPROC_GETADDR],
1136 static unsigned int rpcb_version2_counts[ARRAY_SIZE(rpcb_procedures2)];
1137 static const struct rpc_version rpcb_version2 = {
1138 .number = RPCBVERS_2,
1139 .nrprocs = ARRAY_SIZE(rpcb_procedures2),
1140 .procs = rpcb_procedures2,
1141 .counts = rpcb_version2_counts,
1144 static unsigned int rpcb_version3_counts[ARRAY_SIZE(rpcb_procedures3)];
1145 static const struct rpc_version rpcb_version3 = {
1146 .number = RPCBVERS_3,
1147 .nrprocs = ARRAY_SIZE(rpcb_procedures3),
1148 .procs = rpcb_procedures3,
1149 .counts = rpcb_version3_counts,
1152 static unsigned int rpcb_version4_counts[ARRAY_SIZE(rpcb_procedures4)];
1153 static const struct rpc_version rpcb_version4 = {
1154 .number = RPCBVERS_4,
1155 .nrprocs = ARRAY_SIZE(rpcb_procedures4),
1156 .procs = rpcb_procedures4,
1157 .counts = rpcb_version4_counts,
1160 static const struct rpc_version *rpcb_version[] = {
1168 static struct rpc_stat rpcb_stats;
1170 static const struct rpc_program rpcb_program = {
1172 .number = RPCBIND_PROGRAM,
1173 .nrvers = ARRAY_SIZE(rpcb_version),
1174 .version = rpcb_version,
1175 .stats = &rpcb_stats,