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/types.h>
28 #include <linux/slab.h>
30 #include <linux/utsname.h>
32 #include <linux/sunrpc/clnt.h>
33 #include <linux/workqueue.h>
34 #include <linux/sunrpc/rpc_pipe_fs.h>
36 #include <linux/nfs.h>
39 #define RPC_SLACK_SPACE (1024) /* total overkill */
42 # define RPCDBG_FACILITY RPCDBG_CALL
45 static DECLARE_WAIT_QUEUE_HEAD(destroy_wait);
48 static void call_start(struct rpc_task *task);
49 static void call_reserve(struct rpc_task *task);
50 static void call_reserveresult(struct rpc_task *task);
51 static void call_allocate(struct rpc_task *task);
52 static void call_encode(struct rpc_task *task);
53 static void call_decode(struct rpc_task *task);
54 static void call_bind(struct rpc_task *task);
55 static void call_transmit(struct rpc_task *task);
56 static void call_status(struct rpc_task *task);
57 static void call_refresh(struct rpc_task *task);
58 static void call_refreshresult(struct rpc_task *task);
59 static void call_timeout(struct rpc_task *task);
60 static void call_connect(struct rpc_task *task);
61 static void call_connect_status(struct rpc_task *task);
62 static u32 * call_header(struct rpc_task *task);
63 static u32 * call_verify(struct rpc_task *task);
67 rpc_setup_pipedir(struct rpc_clnt *clnt, char *dir_name)
69 static uint32_t clntid;
75 snprintf(clnt->cl_pathname, sizeof(clnt->cl_pathname),
76 "%s/clnt%x", dir_name,
77 (unsigned int)clntid++);
78 clnt->cl_pathname[sizeof(clnt->cl_pathname) - 1] = '\0';
79 clnt->cl_dentry = rpc_mkdir(clnt->cl_pathname, clnt);
80 if (!IS_ERR(clnt->cl_dentry))
82 error = PTR_ERR(clnt->cl_dentry);
83 if (error != -EEXIST) {
84 printk(KERN_INFO "RPC: Couldn't create pipefs entry %s, error %d\n",
85 clnt->cl_pathname, error);
92 * Create an RPC client
93 * FIXME: This should also take a flags argument (as in task->tk_flags).
94 * It's called (among others) from pmap_create_client, which may in
95 * turn be called by an async task. In this case, rpciod should not be
96 * made to sleep too long.
99 rpc_create_client(struct rpc_xprt *xprt, char *servname,
100 struct rpc_program *program, u32 vers,
101 rpc_authflavor_t flavor)
103 struct rpc_version *version;
104 struct rpc_clnt *clnt = NULL;
108 dprintk("RPC: creating %s client for %s (xprt %p)\n",
109 program->name, servname, xprt);
114 if (vers >= program->nrvers || !(version = program->version[vers]))
118 clnt = (struct rpc_clnt *) kmalloc(sizeof(*clnt), GFP_KERNEL);
121 memset(clnt, 0, sizeof(*clnt));
122 atomic_set(&clnt->cl_users, 0);
123 atomic_set(&clnt->cl_count, 1);
124 clnt->cl_parent = clnt;
126 clnt->cl_server = clnt->cl_inline_name;
127 len = strlen(servname) + 1;
128 if (len > sizeof(clnt->cl_inline_name)) {
129 char *buf = kmalloc(len, GFP_KERNEL);
131 clnt->cl_server = buf;
133 len = sizeof(clnt->cl_inline_name);
135 strlcpy(clnt->cl_server, servname, len);
137 clnt->cl_xprt = xprt;
138 clnt->cl_procinfo = version->procs;
139 clnt->cl_maxproc = version->nrprocs;
140 clnt->cl_protname = program->name;
141 clnt->cl_pmap = &clnt->cl_pmap_default;
142 clnt->cl_port = xprt->addr.sin_port;
143 clnt->cl_prog = program->number;
144 clnt->cl_vers = version->number;
145 clnt->cl_prot = xprt->prot;
146 clnt->cl_stats = program->stats;
147 rpc_init_wait_queue(&clnt->cl_pmap_default.pm_bindwait, "bindwait");
150 clnt->cl_autobind = 1;
152 clnt->cl_rtt = &clnt->cl_rtt_default;
153 rpc_init_rtt(&clnt->cl_rtt_default, xprt->timeout.to_initval);
155 err = rpc_setup_pipedir(clnt, program->pipe_dir_name);
160 if (!rpcauth_create(flavor, clnt)) {
161 printk(KERN_INFO "RPC: Couldn't create auth handle (flavor %u)\n",
166 /* save the nodename */
167 clnt->cl_nodelen = strlen(system_utsname.nodename);
168 if (clnt->cl_nodelen > UNX_MAXNODENAME)
169 clnt->cl_nodelen = UNX_MAXNODENAME;
170 memcpy(clnt->cl_nodename, system_utsname.nodename, clnt->cl_nodelen);
174 rpc_rmdir(clnt->cl_pathname);
176 if (clnt->cl_server != clnt->cl_inline_name)
177 kfree(clnt->cl_server);
184 * This function clones the RPC client structure. It allows us to share the
185 * same transport while varying parameters such as the authentication
189 rpc_clone_client(struct rpc_clnt *clnt)
191 struct rpc_clnt *new;
193 new = (struct rpc_clnt *)kmalloc(sizeof(*new), GFP_KERNEL);
196 memcpy(new, clnt, sizeof(*new));
197 atomic_set(&new->cl_count, 1);
198 atomic_set(&new->cl_users, 0);
199 atomic_inc(&new->cl_parent->cl_count);
201 atomic_inc(&new->cl_auth->au_count);
204 printk(KERN_INFO "RPC: out of memory in %s\n", __FUNCTION__);
205 return ERR_PTR(-ENOMEM);
209 * Properly shut down an RPC client, terminating all outstanding
210 * requests. Note that we must be certain that cl_oneshot and
211 * cl_dead are cleared, or else the client would be destroyed
212 * when the last task releases it.
215 rpc_shutdown_client(struct rpc_clnt *clnt)
218 init_waitqueue_entry(&__wait, current);
219 dprintk("RPC: shutting down %s client for %s, tasks=%d\n",
220 clnt->cl_protname, clnt->cl_server,
221 atomic_read(&clnt->cl_users));
223 add_wait_queue(&destroy_wait, &__wait);
224 set_current_state(TASK_UNINTERRUPTIBLE);
225 while (atomic_read(&clnt->cl_users) > 0) {
226 /* Don't let rpc_release_client destroy us */
227 clnt->cl_oneshot = 0;
229 rpc_killall_tasks(clnt);
230 schedule_timeout(1*HZ);
231 set_current_state(TASK_UNINTERRUPTIBLE);
233 current->state = TASK_RUNNING;
234 remove_wait_queue(&destroy_wait, &__wait);
236 if (atomic_read(&clnt->cl_users) < 0) {
237 printk(KERN_ERR "RPC: rpc_shutdown_client clnt %p tasks=%d\n",
238 clnt, atomic_read(&clnt->cl_users));
245 return rpc_destroy_client(clnt);
249 * Delete an RPC client
252 rpc_destroy_client(struct rpc_clnt *clnt)
254 if (!atomic_dec_and_test(&clnt->cl_count))
256 BUG_ON(atomic_read(&clnt->cl_users) != 0);
258 dprintk("RPC: destroying %s client for %s\n",
259 clnt->cl_protname, clnt->cl_server);
261 rpcauth_destroy(clnt->cl_auth);
262 clnt->cl_auth = NULL;
264 if (clnt->cl_parent != clnt) {
265 rpc_destroy_client(clnt->cl_parent);
268 if (clnt->cl_pathname[0])
269 rpc_rmdir(clnt->cl_pathname);
271 xprt_destroy(clnt->cl_xprt);
272 clnt->cl_xprt = NULL;
274 if (clnt->cl_server != clnt->cl_inline_name)
275 kfree(clnt->cl_server);
282 * Release an RPC client
285 rpc_release_client(struct rpc_clnt *clnt)
287 dprintk("RPC: rpc_release_client(%p, %d)\n",
288 clnt, atomic_read(&clnt->cl_users));
290 if (!atomic_dec_and_test(&clnt->cl_users))
292 wake_up(&destroy_wait);
293 if (clnt->cl_oneshot || clnt->cl_dead)
294 rpc_destroy_client(clnt);
298 * Default callback for async RPC calls
301 rpc_default_callback(struct rpc_task *task)
306 * Export the signal mask handling for aysnchronous code that
307 * sleeps on RPC calls
310 void rpc_clnt_sigmask(struct rpc_clnt *clnt, sigset_t *oldset)
312 unsigned long sigallow = sigmask(SIGKILL);
313 unsigned long irqflags;
315 /* Turn off various signals */
317 struct k_sigaction *action = current->sighand->action;
318 if (action[SIGINT-1].sa.sa_handler == SIG_DFL)
319 sigallow |= sigmask(SIGINT);
320 if (action[SIGQUIT-1].sa.sa_handler == SIG_DFL)
321 sigallow |= sigmask(SIGQUIT);
323 spin_lock_irqsave(¤t->sighand->siglock, irqflags);
324 *oldset = current->blocked;
325 siginitsetinv(¤t->blocked, sigallow & ~oldset->sig[0]);
327 spin_unlock_irqrestore(¤t->sighand->siglock, irqflags);
330 void rpc_clnt_sigunmask(struct rpc_clnt *clnt, sigset_t *oldset)
332 unsigned long irqflags;
334 spin_lock_irqsave(¤t->sighand->siglock, irqflags);
335 current->blocked = *oldset;
337 spin_unlock_irqrestore(¤t->sighand->siglock, irqflags);
341 * New rpc_call implementation
343 int rpc_call_sync(struct rpc_clnt *clnt, struct rpc_message *msg, int flags)
345 struct rpc_task my_task, *task = &my_task;
349 /* If this client is slain all further I/O fails */
353 if (flags & RPC_TASK_ASYNC) {
354 printk("rpc_call_sync: Illegal flag combination for synchronous task\n");
355 flags &= ~RPC_TASK_ASYNC;
358 rpc_clnt_sigmask(clnt, &oldset);
360 /* Create/initialize a new RPC task */
361 rpc_init_task(task, clnt, NULL, flags);
362 rpc_call_setup(task, msg, 0);
364 /* Set up the call info struct and execute the task */
365 if (task->tk_status == 0)
366 status = rpc_execute(task);
368 status = task->tk_status;
369 rpc_release_task(task);
372 rpc_clnt_sigunmask(clnt, &oldset);
378 * New rpc_call implementation
381 rpc_call_async(struct rpc_clnt *clnt, struct rpc_message *msg, int flags,
382 rpc_action callback, void *data)
384 struct rpc_task *task;
388 /* If this client is slain all further I/O fails */
392 flags |= RPC_TASK_ASYNC;
394 rpc_clnt_sigmask(clnt, &oldset);
396 /* Create/initialize a new RPC task */
398 callback = rpc_default_callback;
400 if (!(task = rpc_new_task(clnt, callback, flags)))
402 task->tk_calldata = data;
404 rpc_call_setup(task, msg, 0);
406 /* Set up the call info struct and execute the task */
407 if (task->tk_status == 0)
408 status = rpc_execute(task);
410 status = task->tk_status;
411 rpc_release_task(task);
415 rpc_clnt_sigunmask(clnt, &oldset);
422 rpc_call_setup(struct rpc_task *task, struct rpc_message *msg, int flags)
425 task->tk_flags |= flags;
426 /* Bind the user cred */
427 if (task->tk_msg.rpc_cred != NULL) {
428 rpcauth_holdcred(task);
430 rpcauth_bindcred(task);
432 if (task->tk_status == 0)
433 task->tk_action = call_start;
435 task->tk_action = NULL;
439 rpc_setbufsize(struct rpc_clnt *clnt, unsigned int sndsize, unsigned int rcvsize)
441 struct rpc_xprt *xprt = clnt->cl_xprt;
445 xprt->sndsize = sndsize + RPC_SLACK_SPACE;
448 xprt->rcvsize = rcvsize + RPC_SLACK_SPACE;
449 if (xprt_connected(xprt))
450 xprt_sock_setbufsize(xprt);
454 * Restart an (async) RPC call. Usually called from within the
458 rpc_restart_call(struct rpc_task *task)
460 if (RPC_ASSASSINATED(task))
463 task->tk_action = call_start;
469 * Other FSM states can be visited zero or more times, but
470 * this state is visited exactly once for each RPC.
473 call_start(struct rpc_task *task)
475 struct rpc_clnt *clnt = task->tk_client;
477 dprintk("RPC: %4d call_start %s%d proc %d (%s)\n", task->tk_pid,
478 clnt->cl_protname, clnt->cl_vers, task->tk_msg.rpc_proc->p_proc,
479 (RPC_IS_ASYNC(task) ? "async" : "sync"));
481 /* Increment call count */
482 task->tk_msg.rpc_proc->p_count++;
483 clnt->cl_stats->rpccnt++;
484 task->tk_action = call_reserve;
488 * 1. Reserve an RPC call slot
491 call_reserve(struct rpc_task *task)
493 dprintk("RPC: %4d call_reserve\n", task->tk_pid);
495 if (!rpcauth_uptodatecred(task)) {
496 task->tk_action = call_refresh;
501 task->tk_action = call_reserveresult;
506 * 1b. Grok the result of xprt_reserve()
509 call_reserveresult(struct rpc_task *task)
511 int status = task->tk_status;
513 dprintk("RPC: %4d call_reserveresult (status %d)\n",
514 task->tk_pid, task->tk_status);
517 * After a call to xprt_reserve(), we must have either
518 * a request slot or else an error status.
522 if (task->tk_rqstp) {
523 task->tk_action = call_allocate;
527 printk(KERN_ERR "%s: status=%d, but no request slot, exiting\n",
528 __FUNCTION__, status);
529 rpc_exit(task, -EIO);
534 * Even though there was an error, we may have acquired
535 * a request slot somehow. Make sure not to leak it.
537 if (task->tk_rqstp) {
538 printk(KERN_ERR "%s: status=%d, request allocated anyway\n",
539 __FUNCTION__, status);
544 case -EAGAIN: /* woken up; retry */
545 task->tk_action = call_reserve;
547 case -EIO: /* probably a shutdown */
550 printk(KERN_ERR "%s: unrecognized error %d, exiting\n",
551 __FUNCTION__, status);
554 rpc_exit(task, status);
558 * 2. Allocate the buffer. For details, see sched.c:rpc_malloc.
559 * (Note: buffer memory is freed in rpc_task_release).
562 call_allocate(struct rpc_task *task)
566 dprintk("RPC: %4d call_allocate (status %d)\n",
567 task->tk_pid, task->tk_status);
568 task->tk_action = call_bind;
572 /* FIXME: compute buffer requirements more exactly using
574 bufsiz = task->tk_msg.rpc_proc->p_bufsiz + RPC_SLACK_SPACE;
576 if (rpc_malloc(task, bufsiz << 1) != NULL)
578 printk(KERN_INFO "RPC: buffer allocation failed for task %p\n", task);
580 if (RPC_IS_ASYNC(task) || !(task->tk_client->cl_intr && signalled())) {
582 task->tk_action = call_reserve;
583 rpc_delay(task, HZ>>4);
587 rpc_exit(task, -ERESTARTSYS);
591 * 3. Encode arguments of an RPC call
594 call_encode(struct rpc_task *task)
596 struct rpc_clnt *clnt = task->tk_client;
597 struct rpc_rqst *req = task->tk_rqstp;
598 struct xdr_buf *sndbuf = &req->rq_snd_buf;
599 struct xdr_buf *rcvbuf = &req->rq_rcv_buf;
605 dprintk("RPC: %4d call_encode (status %d)\n",
606 task->tk_pid, task->tk_status);
608 /* Default buffer setup */
609 bufsiz = task->tk_bufsize >> 1;
610 sndbuf->head[0].iov_base = (void *)task->tk_buffer;
611 sndbuf->head[0].iov_len = bufsiz;
612 sndbuf->tail[0].iov_len = 0;
613 sndbuf->page_len = 0;
615 sndbuf->buflen = bufsiz;
616 rcvbuf->head[0].iov_base = (void *)((char *)task->tk_buffer + bufsiz);
617 rcvbuf->head[0].iov_len = bufsiz;
618 rcvbuf->tail[0].iov_len = 0;
619 rcvbuf->page_len = 0;
621 rcvbuf->buflen = bufsiz;
623 /* Encode header and provided arguments */
624 encode = task->tk_msg.rpc_proc->p_encode;
625 if (!(p = call_header(task))) {
626 printk(KERN_INFO "RPC: call_header failed, exit EIO\n");
627 rpc_exit(task, -EIO);
630 if (encode && (status = rpcauth_wrap_req(task, encode, req, p,
631 task->tk_msg.rpc_argp)) < 0) {
632 printk(KERN_WARNING "%s: can't encode arguments: %d\n",
633 clnt->cl_protname, -status);
634 rpc_exit(task, status);
639 * 4. Get the server port number if not yet set
642 call_bind(struct rpc_task *task)
644 struct rpc_clnt *clnt = task->tk_client;
645 struct rpc_xprt *xprt = clnt->cl_xprt;
647 dprintk("RPC: %4d call_bind xprt %p %s connected\n", task->tk_pid,
648 xprt, (xprt_connected(xprt) ? "is" : "is not"));
650 task->tk_action = (xprt_connected(xprt)) ? call_transmit : call_connect;
652 if (!clnt->cl_port) {
653 task->tk_action = call_connect;
654 task->tk_timeout = RPC_CONNECT_TIMEOUT;
655 rpc_getport(task, clnt);
660 * 4a. Connect to the RPC server (TCP case)
663 call_connect(struct rpc_task *task)
665 struct rpc_clnt *clnt = task->tk_client;
667 dprintk("RPC: %4d call_connect status %d\n",
668 task->tk_pid, task->tk_status);
670 if (xprt_connected(clnt->cl_xprt)) {
671 task->tk_action = call_transmit;
674 task->tk_action = call_connect_status;
675 if (task->tk_status < 0)
681 * 4b. Sort out connect result
684 call_connect_status(struct rpc_task *task)
686 struct rpc_clnt *clnt = task->tk_client;
687 int status = task->tk_status;
691 clnt->cl_stats->netreconn++;
692 task->tk_action = call_transmit;
696 /* Something failed: we may have to rebind */
697 if (clnt->cl_autobind)
703 task->tk_action = (clnt->cl_port == 0) ? call_bind : call_connect;
706 rpc_exit(task, -EIO);
711 * 5. Transmit the RPC request, and wait for reply
714 call_transmit(struct rpc_task *task)
716 dprintk("RPC: %4d call_transmit (status %d)\n",
717 task->tk_pid, task->tk_status);
719 task->tk_action = call_status;
720 if (task->tk_status < 0)
722 task->tk_status = xprt_prepare_transmit(task);
723 if (task->tk_status != 0)
725 /* Encode here so that rpcsec_gss can use correct sequence number. */
726 if (!task->tk_rqstp->rq_bytes_sent)
728 if (task->tk_status < 0)
731 if (task->tk_status < 0)
733 if (!task->tk_msg.rpc_proc->p_decode) {
734 task->tk_action = NULL;
735 rpc_wake_up_task(task);
740 * 6. Sort out the RPC call status
743 call_status(struct rpc_task *task)
745 struct rpc_clnt *clnt = task->tk_client;
746 struct rpc_rqst *req = task->tk_rqstp;
749 if (req->rq_received > 0 && !req->rq_bytes_sent)
750 task->tk_status = req->rq_received;
752 dprintk("RPC: %4d call_status (status %d)\n",
753 task->tk_pid, task->tk_status);
755 status = task->tk_status;
757 task->tk_action = call_decode;
764 task->tk_action = call_timeout;
768 req->rq_bytes_sent = 0;
769 if (clnt->cl_autobind)
771 task->tk_action = call_bind;
774 task->tk_action = call_transmit;
777 /* shutdown or soft timeout */
778 rpc_exit(task, status);
782 printk("%s: RPC call returned error %d\n",
783 clnt->cl_protname, -status);
784 rpc_exit(task, status);
790 * 6a. Handle RPC timeout
791 * We do not release the request slot, so we keep using the
792 * same XID for all retransmits.
795 call_timeout(struct rpc_task *task)
797 struct rpc_clnt *clnt = task->tk_client;
799 if (xprt_adjust_timeout(task->tk_rqstp) == 0) {
800 dprintk("RPC: %4d call_timeout (minor)\n", task->tk_pid);
804 dprintk("RPC: %4d call_timeout (major)\n", task->tk_pid);
805 if (RPC_IS_SOFT(task)) {
807 printk(KERN_NOTICE "%s: server %s not responding, timed out\n",
808 clnt->cl_protname, clnt->cl_server);
809 rpc_exit(task, -EIO);
813 if (clnt->cl_chatty && !(task->tk_flags & RPC_CALL_MAJORSEEN)) {
814 task->tk_flags |= RPC_CALL_MAJORSEEN;
815 printk(KERN_NOTICE "%s: server %s not responding, still trying\n",
816 clnt->cl_protname, clnt->cl_server);
818 if (clnt->cl_autobind)
822 clnt->cl_stats->rpcretrans++;
823 task->tk_action = call_bind;
828 * 7. Decode the RPC reply
831 call_decode(struct rpc_task *task)
833 struct rpc_clnt *clnt = task->tk_client;
834 struct rpc_rqst *req = task->tk_rqstp;
835 kxdrproc_t decode = task->tk_msg.rpc_proc->p_decode;
838 dprintk("RPC: %4d call_decode (status %d)\n",
839 task->tk_pid, task->tk_status);
841 if (clnt->cl_chatty && (task->tk_flags & RPC_CALL_MAJORSEEN)) {
842 printk(KERN_NOTICE "%s: server %s OK\n",
843 clnt->cl_protname, clnt->cl_server);
844 task->tk_flags &= ~RPC_CALL_MAJORSEEN;
847 if (task->tk_status < 12) {
848 if (!RPC_IS_SOFT(task)) {
849 task->tk_action = call_bind;
850 clnt->cl_stats->rpcretrans++;
853 printk(KERN_WARNING "%s: too small RPC reply size (%d bytes)\n",
854 clnt->cl_protname, task->tk_status);
855 rpc_exit(task, -EIO);
859 req->rq_rcv_buf.len = req->rq_private_buf.len;
861 /* Check that the softirq receive buffer is valid */
862 WARN_ON(memcmp(&req->rq_rcv_buf, &req->rq_private_buf,
863 sizeof(req->rq_rcv_buf)) != 0);
865 /* Verify the RPC header */
866 if (!(p = call_verify(task))) {
867 if (task->tk_action == NULL)
873 * The following is an NFS-specific hack to cater for setuid
874 * processes whose uid is mapped to nobody on the server.
876 if (task->tk_client->cl_droppriv &&
877 (ntohl(*p) == NFSERR_ACCES || ntohl(*p) == NFSERR_PERM)) {
878 if (RPC_IS_SETUID(task) && task->tk_suid_retry) {
879 dprintk("RPC: %4d retry squashed uid\n", task->tk_pid);
880 task->tk_flags ^= RPC_CALL_REALUID;
881 task->tk_action = call_bind;
882 task->tk_suid_retry--;
887 task->tk_action = NULL;
890 task->tk_status = rpcauth_unwrap_resp(task, decode, req, p,
891 task->tk_msg.rpc_resp);
892 dprintk("RPC: %4d call_decode result %d\n", task->tk_pid,
896 req->rq_received = req->rq_private_buf.len = 0;
901 * 8. Refresh the credentials if rejected by the server
904 call_refresh(struct rpc_task *task)
906 dprintk("RPC: %4d call_refresh\n", task->tk_pid);
908 xprt_release(task); /* Must do to obtain new XID */
909 task->tk_action = call_refreshresult;
911 task->tk_client->cl_stats->rpcauthrefresh++;
912 rpcauth_refreshcred(task);
916 * 8a. Process the results of a credential refresh
919 call_refreshresult(struct rpc_task *task)
921 int status = task->tk_status;
922 dprintk("RPC: %4d call_refreshresult (status %d)\n",
923 task->tk_pid, task->tk_status);
926 task->tk_action = call_reserve;
927 if (status >= 0 && rpcauth_uptodatecred(task))
929 if (rpcauth_deadcred(task)) {
930 rpc_exit(task, -EACCES);
933 task->tk_action = call_refresh;
934 if (status != -ETIMEDOUT)
935 rpc_delay(task, 3*HZ);
940 * Call header serialization
943 call_header(struct rpc_task *task)
945 struct rpc_clnt *clnt = task->tk_client;
946 struct rpc_xprt *xprt = clnt->cl_xprt;
947 struct rpc_rqst *req = task->tk_rqstp;
948 u32 *p = req->rq_svec[0].iov_base;
950 /* FIXME: check buffer size? */
952 *p++ = 0; /* fill in later */
953 *p++ = req->rq_xid; /* XID */
954 *p++ = htonl(RPC_CALL); /* CALL */
955 *p++ = htonl(RPC_VERSION); /* RPC version */
956 *p++ = htonl(clnt->cl_prog); /* program number */
957 *p++ = htonl(clnt->cl_vers); /* program version */
958 *p++ = htonl(task->tk_msg.rpc_proc->p_proc); /* procedure */
959 return rpcauth_marshcred(task, p);
963 * Reply header verification
966 call_verify(struct rpc_task *task)
968 u32 *p = task->tk_rqstp->rq_rcv_buf.head[0].iov_base, n;
970 p += 1; /* skip XID */
972 if ((n = ntohl(*p++)) != RPC_REPLY) {
973 printk(KERN_WARNING "call_verify: not an RPC reply: %x\n", n);
976 if ((n = ntohl(*p++)) != RPC_MSG_ACCEPTED) {
979 if ((n = ntohl(*p++)) != RPC_AUTH_ERROR) {
980 printk(KERN_WARNING "call_verify: RPC call rejected: %x\n", n);
982 switch ((n = ntohl(*p++))) {
983 case RPC_AUTH_REJECTEDCRED:
984 case RPC_AUTH_REJECTEDVERF:
985 case RPCSEC_GSS_CREDPROBLEM:
986 case RPCSEC_GSS_CTXPROBLEM:
987 if (!task->tk_cred_retry)
989 task->tk_cred_retry--;
990 dprintk("RPC: %4d call_verify: retry stale creds\n",
992 rpcauth_invalcred(task);
993 task->tk_action = call_refresh;
995 case RPC_AUTH_BADCRED:
996 case RPC_AUTH_BADVERF:
997 /* possibly garbled cred/verf? */
998 if (!task->tk_garb_retry)
1000 task->tk_garb_retry--;
1001 dprintk("RPC: %4d call_verify: retry garbled creds\n",
1003 task->tk_action = call_bind;
1005 case RPC_AUTH_TOOWEAK:
1006 printk(KERN_NOTICE "call_verify: server requires stronger "
1007 "authentication.\n");
1010 printk(KERN_WARNING "call_verify: unknown auth error: %x\n", n);
1013 dprintk("RPC: %4d call_verify: call rejected %d\n",
1015 rpc_exit(task, error);
1018 if (!(p = rpcauth_checkverf(task, p))) {
1019 printk(KERN_WARNING "call_verify: auth check failed\n");
1020 goto garbage; /* bad verifier, retry */
1022 switch ((n = ntohl(*p++))) {
1025 case RPC_PROG_UNAVAIL:
1026 printk(KERN_WARNING "RPC: call_verify: program %u is unsupported by server %s\n",
1027 (unsigned int)task->tk_client->cl_prog,
1028 task->tk_client->cl_server);
1030 case RPC_PROG_MISMATCH:
1031 printk(KERN_WARNING "RPC: call_verify: program %u, version %u unsupported by server %s\n",
1032 (unsigned int)task->tk_client->cl_prog,
1033 (unsigned int)task->tk_client->cl_vers,
1034 task->tk_client->cl_server);
1036 case RPC_PROC_UNAVAIL:
1037 printk(KERN_WARNING "RPC: call_verify: proc %p unsupported by program %u, version %u on server %s\n",
1038 task->tk_msg.rpc_proc,
1039 task->tk_client->cl_prog,
1040 task->tk_client->cl_vers,
1041 task->tk_client->cl_server);
1043 case RPC_GARBAGE_ARGS:
1046 printk(KERN_WARNING "call_verify: server accept status: %x\n", n);
1051 dprintk("RPC: %4d call_verify: server saw garbage\n", task->tk_pid);
1052 task->tk_client->cl_stats->rpcgarbage++;
1053 if (task->tk_garb_retry) {
1054 task->tk_garb_retry--;
1055 dprintk(KERN_WARNING "RPC: garbage, retrying %4d\n", task->tk_pid);
1056 task->tk_action = call_bind;
1059 printk(KERN_WARNING "RPC: garbage, exit EIO\n");
1061 rpc_exit(task, -EIO);