2 * linux/net/sunrpc/rpcclnt.c
4 * This file contains the high-level RPC interface.
5 * It is modeled as a finite state machine to support both synchronous
6 * and asynchronous requests.
8 * - RPC header generation and argument serialization.
9 * - Credential refresh.
10 * - TCP connect handling.
11 * - Retry of operation when it is suspected the operation failed because
12 * of uid squashing on the server, or when the credentials were stale
13 * and need to be refreshed, or when a packet was damaged in transit.
14 * This may be have to be moved to the VFS layer.
16 * NB: BSD uses a more intelligent approach to guessing when a request
17 * or reply has been lost by keeping the RTO estimate for each procedure.
18 * We currently make do with a constant timeout value.
20 * Copyright (C) 1992,1993 Rick Sladkey <jrs@world.std.com>
21 * Copyright (C) 1995,1996 Olaf Kirch <okir@monad.swb.de>
24 #include <asm/system.h>
26 #include <linux/module.h>
27 #include <linux/types.h>
29 #include <linux/slab.h>
31 #include <linux/utsname.h>
33 #include <linux/sunrpc/clnt.h>
34 #include <linux/workqueue.h>
35 #include <linux/sunrpc/rpc_pipe_fs.h>
37 #include <linux/nfs.h>
40 #define RPC_SLACK_SPACE (1024) /* total overkill */
43 # define RPCDBG_FACILITY RPCDBG_CALL
46 static DECLARE_WAIT_QUEUE_HEAD(destroy_wait);
49 static void call_start(struct rpc_task *task);
50 static void call_reserve(struct rpc_task *task);
51 static void call_reserveresult(struct rpc_task *task);
52 static void call_allocate(struct rpc_task *task);
53 static void call_encode(struct rpc_task *task);
54 static void call_decode(struct rpc_task *task);
55 static void call_bind(struct rpc_task *task);
56 static void call_transmit(struct rpc_task *task);
57 static void call_status(struct rpc_task *task);
58 static void call_refresh(struct rpc_task *task);
59 static void call_refreshresult(struct rpc_task *task);
60 static void call_timeout(struct rpc_task *task);
61 static void call_connect(struct rpc_task *task);
62 static void call_connect_status(struct rpc_task *task);
63 static u32 * call_header(struct rpc_task *task);
64 static u32 * call_verify(struct rpc_task *task);
68 rpc_setup_pipedir(struct rpc_clnt *clnt, char *dir_name)
70 static uint32_t clntid;
76 snprintf(clnt->cl_pathname, sizeof(clnt->cl_pathname),
77 "%s/clnt%x", dir_name,
78 (unsigned int)clntid++);
79 clnt->cl_pathname[sizeof(clnt->cl_pathname) - 1] = '\0';
80 clnt->cl_dentry = rpc_mkdir(clnt->cl_pathname, clnt);
81 if (!IS_ERR(clnt->cl_dentry))
83 error = PTR_ERR(clnt->cl_dentry);
84 if (error != -EEXIST) {
85 printk(KERN_INFO "RPC: Couldn't create pipefs entry %s, error %d\n",
86 clnt->cl_pathname, error);
93 * Create an RPC client
94 * FIXME: This should also take a flags argument (as in task->tk_flags).
95 * It's called (among others) from pmap_create_client, which may in
96 * turn be called by an async task. In this case, rpciod should not be
97 * made to sleep too long.
100 rpc_create_client(struct rpc_xprt *xprt, char *servname,
101 struct rpc_program *program, u32 vers,
102 rpc_authflavor_t flavor)
104 struct rpc_version *version;
105 struct rpc_clnt *clnt = NULL;
109 dprintk("RPC: creating %s client for %s (xprt %p)\n",
110 program->name, servname, xprt);
115 if (vers >= program->nrvers || !(version = program->version[vers]))
119 clnt = (struct rpc_clnt *) kmalloc(sizeof(*clnt), GFP_KERNEL);
122 memset(clnt, 0, sizeof(*clnt));
123 atomic_set(&clnt->cl_users, 0);
124 atomic_set(&clnt->cl_count, 1);
125 clnt->cl_parent = clnt;
127 clnt->cl_server = clnt->cl_inline_name;
128 len = strlen(servname) + 1;
129 if (len > sizeof(clnt->cl_inline_name)) {
130 char *buf = kmalloc(len, GFP_KERNEL);
132 clnt->cl_server = buf;
134 len = sizeof(clnt->cl_inline_name);
136 strlcpy(clnt->cl_server, servname, len);
138 clnt->cl_xprt = xprt;
139 clnt->cl_procinfo = version->procs;
140 clnt->cl_maxproc = version->nrprocs;
141 clnt->cl_protname = program->name;
142 clnt->cl_pmap = &clnt->cl_pmap_default;
143 clnt->cl_port = xprt->addr.sin_port;
144 clnt->cl_prog = program->number;
145 clnt->cl_vers = version->number;
146 clnt->cl_prot = xprt->prot;
147 clnt->cl_stats = program->stats;
148 rpc_init_wait_queue(&clnt->cl_pmap_default.pm_bindwait, "bindwait");
151 clnt->cl_autobind = 1;
153 clnt->cl_rtt = &clnt->cl_rtt_default;
154 rpc_init_rtt(&clnt->cl_rtt_default, xprt->timeout.to_initval);
156 err = rpc_setup_pipedir(clnt, program->pipe_dir_name);
161 if (!rpcauth_create(flavor, clnt)) {
162 printk(KERN_INFO "RPC: Couldn't create auth handle (flavor %u)\n",
167 /* save the nodename */
168 clnt->cl_nodelen = strlen(system_utsname.nodename);
169 if (clnt->cl_nodelen > UNX_MAXNODENAME)
170 clnt->cl_nodelen = UNX_MAXNODENAME;
171 memcpy(clnt->cl_nodename, system_utsname.nodename, clnt->cl_nodelen);
175 rpc_rmdir(clnt->cl_pathname);
177 if (clnt->cl_server != clnt->cl_inline_name)
178 kfree(clnt->cl_server);
186 * This function clones the RPC client structure. It allows us to share the
187 * same transport while varying parameters such as the authentication
191 rpc_clone_client(struct rpc_clnt *clnt)
193 struct rpc_clnt *new;
195 new = (struct rpc_clnt *)kmalloc(sizeof(*new), GFP_KERNEL);
198 memcpy(new, clnt, sizeof(*new));
199 atomic_set(&new->cl_count, 1);
200 atomic_set(&new->cl_users, 0);
201 new->cl_parent = clnt;
202 atomic_inc(&clnt->cl_count);
203 /* Duplicate portmapper */
204 rpc_init_wait_queue(&new->cl_pmap_default.pm_bindwait, "bindwait");
205 /* Turn off autobind on clones */
206 new->cl_autobind = 0;
209 rpc_init_rtt(&new->cl_rtt_default, clnt->cl_xprt->timeout.to_initval);
211 atomic_inc(&new->cl_auth->au_count);
214 printk(KERN_INFO "RPC: out of memory in %s\n", __FUNCTION__);
215 return ERR_PTR(-ENOMEM);
219 * Properly shut down an RPC client, terminating all outstanding
220 * requests. Note that we must be certain that cl_oneshot and
221 * cl_dead are cleared, or else the client would be destroyed
222 * when the last task releases it.
225 rpc_shutdown_client(struct rpc_clnt *clnt)
227 dprintk("RPC: shutting down %s client for %s, tasks=%d\n",
228 clnt->cl_protname, clnt->cl_server,
229 atomic_read(&clnt->cl_users));
231 while (atomic_read(&clnt->cl_users) > 0) {
232 /* Don't let rpc_release_client destroy us */
233 clnt->cl_oneshot = 0;
235 rpc_killall_tasks(clnt);
236 sleep_on_timeout(&destroy_wait, 1*HZ);
239 if (atomic_read(&clnt->cl_users) < 0) {
240 printk(KERN_ERR "RPC: rpc_shutdown_client clnt %p tasks=%d\n",
241 clnt, atomic_read(&clnt->cl_users));
248 return rpc_destroy_client(clnt);
252 * Delete an RPC client
255 rpc_destroy_client(struct rpc_clnt *clnt)
257 if (!atomic_dec_and_test(&clnt->cl_count))
259 BUG_ON(atomic_read(&clnt->cl_users) != 0);
261 dprintk("RPC: destroying %s client for %s\n",
262 clnt->cl_protname, clnt->cl_server);
264 rpcauth_destroy(clnt->cl_auth);
265 clnt->cl_auth = NULL;
267 if (clnt->cl_parent != clnt) {
268 rpc_destroy_client(clnt->cl_parent);
271 if (clnt->cl_pathname[0])
272 rpc_rmdir(clnt->cl_pathname);
274 xprt_destroy(clnt->cl_xprt);
275 clnt->cl_xprt = NULL;
277 if (clnt->cl_server != clnt->cl_inline_name)
278 kfree(clnt->cl_server);
285 * Release an RPC client
288 rpc_release_client(struct rpc_clnt *clnt)
290 dprintk("RPC: rpc_release_client(%p, %d)\n",
291 clnt, atomic_read(&clnt->cl_users));
293 if (!atomic_dec_and_test(&clnt->cl_users))
295 wake_up(&destroy_wait);
296 if (clnt->cl_oneshot || clnt->cl_dead)
297 rpc_destroy_client(clnt);
301 * Default callback for async RPC calls
304 rpc_default_callback(struct rpc_task *task)
309 * Export the signal mask handling for aysnchronous code that
310 * sleeps on RPC calls
313 void rpc_clnt_sigmask(struct rpc_clnt *clnt, sigset_t *oldset)
315 unsigned long sigallow = sigmask(SIGKILL);
316 unsigned long irqflags;
318 /* Turn off various signals */
320 struct k_sigaction *action = current->sighand->action;
321 if (action[SIGINT-1].sa.sa_handler == SIG_DFL)
322 sigallow |= sigmask(SIGINT);
323 if (action[SIGQUIT-1].sa.sa_handler == SIG_DFL)
324 sigallow |= sigmask(SIGQUIT);
326 spin_lock_irqsave(¤t->sighand->siglock, irqflags);
327 *oldset = current->blocked;
328 siginitsetinv(¤t->blocked, sigallow & ~oldset->sig[0]);
330 spin_unlock_irqrestore(¤t->sighand->siglock, irqflags);
333 void rpc_clnt_sigunmask(struct rpc_clnt *clnt, sigset_t *oldset)
335 unsigned long irqflags;
337 spin_lock_irqsave(¤t->sighand->siglock, irqflags);
338 current->blocked = *oldset;
340 spin_unlock_irqrestore(¤t->sighand->siglock, irqflags);
344 * New rpc_call implementation
346 int rpc_call_sync(struct rpc_clnt *clnt, struct rpc_message *msg, int flags)
348 struct rpc_task *task;
352 /* If this client is slain all further I/O fails */
356 BUG_ON(flags & RPC_TASK_ASYNC);
358 rpc_clnt_sigmask(clnt, &oldset);
361 task = rpc_new_task(clnt, NULL, flags);
365 rpc_call_setup(task, msg, 0);
367 /* Set up the call info struct and execute the task */
368 if (task->tk_status == 0)
369 status = rpc_execute(task);
371 status = task->tk_status;
372 rpc_release_task(task);
376 rpc_clnt_sigunmask(clnt, &oldset);
382 * New rpc_call implementation
385 rpc_call_async(struct rpc_clnt *clnt, struct rpc_message *msg, int flags,
386 rpc_action callback, void *data)
388 struct rpc_task *task;
392 /* If this client is slain all further I/O fails */
396 flags |= RPC_TASK_ASYNC;
398 rpc_clnt_sigmask(clnt, &oldset);
400 /* Create/initialize a new RPC task */
402 callback = rpc_default_callback;
404 if (!(task = rpc_new_task(clnt, callback, flags)))
406 task->tk_calldata = data;
408 rpc_call_setup(task, msg, 0);
410 /* Set up the call info struct and execute the task */
411 status = task->tk_status;
415 rpc_release_task(task);
418 rpc_clnt_sigunmask(clnt, &oldset);
425 rpc_call_setup(struct rpc_task *task, struct rpc_message *msg, int flags)
428 task->tk_flags |= flags;
429 /* Bind the user cred */
430 if (task->tk_msg.rpc_cred != NULL)
431 rpcauth_holdcred(task);
433 rpcauth_bindcred(task);
435 if (task->tk_status == 0)
436 task->tk_action = call_start;
438 task->tk_action = NULL;
442 rpc_setbufsize(struct rpc_clnt *clnt, unsigned int sndsize, unsigned int rcvsize)
444 struct rpc_xprt *xprt = clnt->cl_xprt;
448 xprt->sndsize = sndsize + RPC_SLACK_SPACE;
451 xprt->rcvsize = rcvsize + RPC_SLACK_SPACE;
452 if (xprt_connected(xprt))
453 xprt_sock_setbufsize(xprt);
457 * Return size of largest payload RPC client can support, in bytes
459 * For stream transports, this is one RPC record fragment (see RFC
460 * 1831), as we don't support multi-record requests yet. For datagram
461 * transports, this is the size of an IP packet minus the IP, UDP, and
464 size_t rpc_max_payload(struct rpc_clnt *clnt)
466 return clnt->cl_xprt->max_payload;
468 EXPORT_SYMBOL(rpc_max_payload);
471 * Restart an (async) RPC call. Usually called from within the
475 rpc_restart_call(struct rpc_task *task)
477 if (RPC_ASSASSINATED(task))
480 task->tk_action = call_start;
486 * Other FSM states can be visited zero or more times, but
487 * this state is visited exactly once for each RPC.
490 call_start(struct rpc_task *task)
492 struct rpc_clnt *clnt = task->tk_client;
494 dprintk("RPC: %4d call_start %s%d proc %d (%s)\n", task->tk_pid,
495 clnt->cl_protname, clnt->cl_vers, task->tk_msg.rpc_proc->p_proc,
496 (RPC_IS_ASYNC(task) ? "async" : "sync"));
498 /* Increment call count */
499 task->tk_msg.rpc_proc->p_count++;
500 clnt->cl_stats->rpccnt++;
501 task->tk_action = call_reserve;
505 * 1. Reserve an RPC call slot
508 call_reserve(struct rpc_task *task)
510 dprintk("RPC: %4d call_reserve\n", task->tk_pid);
512 if (!rpcauth_uptodatecred(task)) {
513 task->tk_action = call_refresh;
518 task->tk_action = call_reserveresult;
523 * 1b. Grok the result of xprt_reserve()
526 call_reserveresult(struct rpc_task *task)
528 int status = task->tk_status;
530 dprintk("RPC: %4d call_reserveresult (status %d)\n",
531 task->tk_pid, task->tk_status);
534 * After a call to xprt_reserve(), we must have either
535 * a request slot or else an error status.
539 if (task->tk_rqstp) {
540 task->tk_action = call_allocate;
544 printk(KERN_ERR "%s: status=%d, but no request slot, exiting\n",
545 __FUNCTION__, status);
546 rpc_exit(task, -EIO);
551 * Even though there was an error, we may have acquired
552 * a request slot somehow. Make sure not to leak it.
554 if (task->tk_rqstp) {
555 printk(KERN_ERR "%s: status=%d, request allocated anyway\n",
556 __FUNCTION__, status);
561 case -EAGAIN: /* woken up; retry */
562 task->tk_action = call_reserve;
564 case -EIO: /* probably a shutdown */
567 printk(KERN_ERR "%s: unrecognized error %d, exiting\n",
568 __FUNCTION__, status);
571 rpc_exit(task, status);
575 * 2. Allocate the buffer. For details, see sched.c:rpc_malloc.
576 * (Note: buffer memory is freed in rpc_task_release).
579 call_allocate(struct rpc_task *task)
583 dprintk("RPC: %4d call_allocate (status %d)\n",
584 task->tk_pid, task->tk_status);
585 task->tk_action = call_bind;
589 /* FIXME: compute buffer requirements more exactly using
591 bufsiz = task->tk_msg.rpc_proc->p_bufsiz + RPC_SLACK_SPACE;
593 if (rpc_malloc(task, bufsiz << 1) != NULL)
595 printk(KERN_INFO "RPC: buffer allocation failed for task %p\n", task);
597 if (RPC_IS_ASYNC(task) || !(task->tk_client->cl_intr && signalled())) {
599 task->tk_action = call_reserve;
600 rpc_delay(task, HZ>>4);
604 rpc_exit(task, -ERESTARTSYS);
608 * 3. Encode arguments of an RPC call
611 call_encode(struct rpc_task *task)
613 struct rpc_clnt *clnt = task->tk_client;
614 struct rpc_rqst *req = task->tk_rqstp;
615 struct xdr_buf *sndbuf = &req->rq_snd_buf;
616 struct xdr_buf *rcvbuf = &req->rq_rcv_buf;
622 dprintk("RPC: %4d call_encode (status %d)\n",
623 task->tk_pid, task->tk_status);
625 /* Default buffer setup */
626 bufsiz = task->tk_bufsize >> 1;
627 sndbuf->head[0].iov_base = (void *)task->tk_buffer;
628 sndbuf->head[0].iov_len = bufsiz;
629 sndbuf->tail[0].iov_len = 0;
630 sndbuf->page_len = 0;
632 sndbuf->buflen = bufsiz;
633 rcvbuf->head[0].iov_base = (void *)((char *)task->tk_buffer + bufsiz);
634 rcvbuf->head[0].iov_len = bufsiz;
635 rcvbuf->tail[0].iov_len = 0;
636 rcvbuf->page_len = 0;
638 rcvbuf->buflen = bufsiz;
640 /* Encode header and provided arguments */
641 encode = task->tk_msg.rpc_proc->p_encode;
642 if (!(p = call_header(task))) {
643 printk(KERN_INFO "RPC: call_header failed, exit EIO\n");
644 rpc_exit(task, -EIO);
647 if (encode && (status = rpcauth_wrap_req(task, encode, req, p,
648 task->tk_msg.rpc_argp)) < 0) {
649 printk(KERN_WARNING "%s: can't encode arguments: %d\n",
650 clnt->cl_protname, -status);
651 rpc_exit(task, status);
656 * 4. Get the server port number if not yet set
659 call_bind(struct rpc_task *task)
661 struct rpc_clnt *clnt = task->tk_client;
662 struct rpc_xprt *xprt = clnt->cl_xprt;
664 dprintk("RPC: %4d call_bind xprt %p %s connected\n", task->tk_pid,
665 xprt, (xprt_connected(xprt) ? "is" : "is not"));
667 task->tk_action = (xprt_connected(xprt)) ? call_transmit : call_connect;
669 if (!clnt->cl_port) {
670 task->tk_action = call_connect;
671 task->tk_timeout = RPC_CONNECT_TIMEOUT;
672 rpc_getport(task, clnt);
677 * 4a. Connect to the RPC server (TCP case)
680 call_connect(struct rpc_task *task)
682 struct rpc_clnt *clnt = task->tk_client;
684 dprintk("RPC: %4d call_connect status %d\n",
685 task->tk_pid, task->tk_status);
687 if (xprt_connected(clnt->cl_xprt)) {
688 task->tk_action = call_transmit;
691 task->tk_action = call_connect_status;
692 if (task->tk_status < 0)
698 * 4b. Sort out connect result
701 call_connect_status(struct rpc_task *task)
703 struct rpc_clnt *clnt = task->tk_client;
704 int status = task->tk_status;
708 clnt->cl_stats->netreconn++;
709 task->tk_action = call_transmit;
713 /* Something failed: we may have to rebind */
714 if (clnt->cl_autobind)
720 task->tk_action = (clnt->cl_port == 0) ? call_bind : call_connect;
723 rpc_exit(task, -EIO);
728 * 5. Transmit the RPC request, and wait for reply
731 call_transmit(struct rpc_task *task)
733 dprintk("RPC: %4d call_transmit (status %d)\n",
734 task->tk_pid, task->tk_status);
736 task->tk_action = call_status;
737 if (task->tk_status < 0)
739 task->tk_status = xprt_prepare_transmit(task);
740 if (task->tk_status != 0)
742 /* Encode here so that rpcsec_gss can use correct sequence number. */
743 if (!task->tk_rqstp->rq_bytes_sent)
745 if (task->tk_status < 0)
748 if (task->tk_status < 0)
750 if (!task->tk_msg.rpc_proc->p_decode) {
751 task->tk_action = NULL;
752 rpc_wake_up_task(task);
757 * 6. Sort out the RPC call status
760 call_status(struct rpc_task *task)
762 struct rpc_clnt *clnt = task->tk_client;
763 struct rpc_rqst *req = task->tk_rqstp;
766 if (req->rq_received > 0 && !req->rq_bytes_sent)
767 task->tk_status = req->rq_received;
769 dprintk("RPC: %4d call_status (status %d)\n",
770 task->tk_pid, task->tk_status);
772 status = task->tk_status;
774 task->tk_action = call_decode;
781 task->tk_action = call_timeout;
785 req->rq_bytes_sent = 0;
786 if (clnt->cl_autobind)
788 task->tk_action = call_bind;
791 task->tk_action = call_transmit;
794 /* shutdown or soft timeout */
795 rpc_exit(task, status);
799 printk("%s: RPC call returned error %d\n",
800 clnt->cl_protname, -status);
801 rpc_exit(task, status);
807 * 6a. Handle RPC timeout
808 * We do not release the request slot, so we keep using the
809 * same XID for all retransmits.
812 call_timeout(struct rpc_task *task)
814 struct rpc_clnt *clnt = task->tk_client;
816 if (xprt_adjust_timeout(task->tk_rqstp) == 0) {
817 dprintk("RPC: %4d call_timeout (minor)\n", task->tk_pid);
821 dprintk("RPC: %4d call_timeout (major)\n", task->tk_pid);
822 if (RPC_IS_SOFT(task)) {
824 printk(KERN_NOTICE "%s: server %s not responding, timed out\n",
825 clnt->cl_protname, clnt->cl_server);
826 rpc_exit(task, -EIO);
830 if (clnt->cl_chatty && !(task->tk_flags & RPC_CALL_MAJORSEEN)) {
831 task->tk_flags |= RPC_CALL_MAJORSEEN;
832 printk(KERN_NOTICE "%s: server %s not responding, still trying\n",
833 clnt->cl_protname, clnt->cl_server);
835 if (clnt->cl_autobind)
839 clnt->cl_stats->rpcretrans++;
840 task->tk_action = call_bind;
845 * 7. Decode the RPC reply
848 call_decode(struct rpc_task *task)
850 struct rpc_clnt *clnt = task->tk_client;
851 struct rpc_rqst *req = task->tk_rqstp;
852 kxdrproc_t decode = task->tk_msg.rpc_proc->p_decode;
855 dprintk("RPC: %4d call_decode (status %d)\n",
856 task->tk_pid, task->tk_status);
858 if (clnt->cl_chatty && (task->tk_flags & RPC_CALL_MAJORSEEN)) {
859 printk(KERN_NOTICE "%s: server %s OK\n",
860 clnt->cl_protname, clnt->cl_server);
861 task->tk_flags &= ~RPC_CALL_MAJORSEEN;
864 if (task->tk_status < 12) {
865 if (!RPC_IS_SOFT(task)) {
866 task->tk_action = call_bind;
867 clnt->cl_stats->rpcretrans++;
870 printk(KERN_WARNING "%s: too small RPC reply size (%d bytes)\n",
871 clnt->cl_protname, task->tk_status);
872 rpc_exit(task, -EIO);
876 req->rq_rcv_buf.len = req->rq_private_buf.len;
878 /* Check that the softirq receive buffer is valid */
879 WARN_ON(memcmp(&req->rq_rcv_buf, &req->rq_private_buf,
880 sizeof(req->rq_rcv_buf)) != 0);
882 /* Verify the RPC header */
883 if (!(p = call_verify(task))) {
884 if (task->tk_action == NULL)
889 task->tk_action = NULL;
892 task->tk_status = rpcauth_unwrap_resp(task, decode, req, p,
893 task->tk_msg.rpc_resp);
894 dprintk("RPC: %4d call_decode result %d\n", task->tk_pid,
898 req->rq_received = req->rq_private_buf.len = 0;
903 * 8. Refresh the credentials if rejected by the server
906 call_refresh(struct rpc_task *task)
908 dprintk("RPC: %4d call_refresh\n", task->tk_pid);
910 xprt_release(task); /* Must do to obtain new XID */
911 task->tk_action = call_refreshresult;
913 task->tk_client->cl_stats->rpcauthrefresh++;
914 rpcauth_refreshcred(task);
918 * 8a. Process the results of a credential refresh
921 call_refreshresult(struct rpc_task *task)
923 int status = task->tk_status;
924 dprintk("RPC: %4d call_refreshresult (status %d)\n",
925 task->tk_pid, task->tk_status);
928 task->tk_action = call_reserve;
929 if (status >= 0 && rpcauth_uptodatecred(task))
931 if (status == -EACCES) {
932 rpc_exit(task, -EACCES);
935 task->tk_action = call_refresh;
936 if (status != -ETIMEDOUT)
937 rpc_delay(task, 3*HZ);
942 * Call header serialization
945 call_header(struct rpc_task *task)
947 struct rpc_clnt *clnt = task->tk_client;
948 struct rpc_xprt *xprt = clnt->cl_xprt;
949 struct rpc_rqst *req = task->tk_rqstp;
950 u32 *p = req->rq_svec[0].iov_base;
952 /* FIXME: check buffer size? */
954 *p++ = 0; /* fill in later */
955 *p++ = req->rq_xid; /* XID */
956 *p++ = htonl(RPC_CALL); /* CALL */
957 *p++ = htonl(RPC_VERSION); /* RPC version */
958 *p++ = htonl(clnt->cl_prog); /* program number */
959 *p++ = htonl(clnt->cl_vers); /* program version */
960 *p++ = htonl(task->tk_msg.rpc_proc->p_proc); /* procedure */
961 p = rpcauth_marshcred(task, p);
962 req->rq_slen = xdr_adjust_iovec(&req->rq_svec[0], p);
967 * Reply header verification
970 call_verify(struct rpc_task *task)
972 struct kvec *iov = &task->tk_rqstp->rq_rcv_buf.head[0];
973 int len = task->tk_rqstp->rq_rcv_buf.len >> 2;
974 u32 *p = iov->iov_base, n;
979 p += 1; /* skip XID */
981 if ((n = ntohl(*p++)) != RPC_REPLY) {
982 printk(KERN_WARNING "call_verify: not an RPC reply: %x\n", n);
985 if ((n = ntohl(*p++)) != RPC_MSG_ACCEPTED) {
988 switch ((n = ntohl(*p++))) {
992 printk(KERN_WARNING "%s: RPC call version mismatch!\n", __FUNCTION__);
995 printk(KERN_WARNING "%s: RPC call rejected, unknown error: %x\n", __FUNCTION__, n);
1000 switch ((n = ntohl(*p++))) {
1001 case RPC_AUTH_REJECTEDCRED:
1002 case RPC_AUTH_REJECTEDVERF:
1003 case RPCSEC_GSS_CREDPROBLEM:
1004 case RPCSEC_GSS_CTXPROBLEM:
1005 if (!task->tk_cred_retry)
1007 task->tk_cred_retry--;
1008 dprintk("RPC: %4d call_verify: retry stale creds\n",
1010 rpcauth_invalcred(task);
1011 task->tk_action = call_refresh;
1013 case RPC_AUTH_BADCRED:
1014 case RPC_AUTH_BADVERF:
1015 /* possibly garbled cred/verf? */
1016 if (!task->tk_garb_retry)
1018 task->tk_garb_retry--;
1019 dprintk("RPC: %4d call_verify: retry garbled creds\n",
1021 task->tk_action = call_bind;
1023 case RPC_AUTH_TOOWEAK:
1024 printk(KERN_NOTICE "call_verify: server requires stronger "
1025 "authentication.\n");
1028 printk(KERN_WARNING "call_verify: unknown auth error: %x\n", n);
1031 dprintk("RPC: %4d call_verify: call rejected %d\n",
1035 if (!(p = rpcauth_checkverf(task, p))) {
1036 printk(KERN_WARNING "call_verify: auth check failed\n");
1037 goto out_retry; /* bad verifier, retry */
1039 len = p - (u32 *)iov->iov_base - 1;
1042 switch ((n = ntohl(*p++))) {
1045 case RPC_PROG_UNAVAIL:
1046 printk(KERN_WARNING "RPC: call_verify: program %u is unsupported by server %s\n",
1047 (unsigned int)task->tk_client->cl_prog,
1048 task->tk_client->cl_server);
1050 case RPC_PROG_MISMATCH:
1051 printk(KERN_WARNING "RPC: call_verify: program %u, version %u unsupported by server %s\n",
1052 (unsigned int)task->tk_client->cl_prog,
1053 (unsigned int)task->tk_client->cl_vers,
1054 task->tk_client->cl_server);
1056 case RPC_PROC_UNAVAIL:
1057 printk(KERN_WARNING "RPC: call_verify: proc %p unsupported by program %u, version %u on server %s\n",
1058 task->tk_msg.rpc_proc,
1059 task->tk_client->cl_prog,
1060 task->tk_client->cl_vers,
1061 task->tk_client->cl_server);
1063 case RPC_GARBAGE_ARGS:
1064 dprintk("RPC: %4d %s: server saw garbage\n", task->tk_pid, __FUNCTION__);
1067 printk(KERN_WARNING "call_verify: server accept status: %x\n", n);
1072 task->tk_client->cl_stats->rpcgarbage++;
1073 if (task->tk_garb_retry) {
1074 task->tk_garb_retry--;
1075 dprintk(KERN_WARNING "RPC %s: retrying %4d\n", __FUNCTION__, task->tk_pid);
1076 task->tk_action = call_bind;
1079 printk(KERN_WARNING "RPC %s: retry failed, exit EIO\n", __FUNCTION__);
1083 rpc_exit(task, error);
1086 printk(KERN_WARNING "RPC %s: server reply was truncated.\n", __FUNCTION__);