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);
185 * This function clones the RPC client structure. It allows us to share the
186 * same transport while varying parameters such as the authentication
190 rpc_clone_client(struct rpc_clnt *clnt)
192 struct rpc_clnt *new;
194 new = (struct rpc_clnt *)kmalloc(sizeof(*new), GFP_KERNEL);
197 memcpy(new, clnt, sizeof(*new));
198 atomic_set(&new->cl_count, 1);
199 atomic_set(&new->cl_users, 0);
200 new->cl_parent = clnt;
201 atomic_inc(&clnt->cl_count);
202 /* Duplicate portmapper */
203 rpc_init_wait_queue(&new->cl_pmap_default.pm_bindwait, "bindwait");
204 /* Turn off autobind on clones */
205 new->cl_autobind = 0;
208 rpc_init_rtt(&new->cl_rtt_default, clnt->cl_xprt->timeout.to_initval);
210 atomic_inc(&new->cl_auth->au_count);
213 printk(KERN_INFO "RPC: out of memory in %s\n", __FUNCTION__);
214 return ERR_PTR(-ENOMEM);
218 * Properly shut down an RPC client, terminating all outstanding
219 * requests. Note that we must be certain that cl_oneshot and
220 * cl_dead are cleared, or else the client would be destroyed
221 * when the last task releases it.
224 rpc_shutdown_client(struct rpc_clnt *clnt)
227 init_waitqueue_entry(&__wait, current);
228 dprintk("RPC: shutting down %s client for %s, tasks=%d\n",
229 clnt->cl_protname, clnt->cl_server,
230 atomic_read(&clnt->cl_users));
232 add_wait_queue(&destroy_wait, &__wait);
233 set_current_state(TASK_UNINTERRUPTIBLE);
234 while (atomic_read(&clnt->cl_users) > 0) {
235 /* Don't let rpc_release_client destroy us */
236 clnt->cl_oneshot = 0;
238 rpc_killall_tasks(clnt);
239 schedule_timeout(1*HZ);
240 set_current_state(TASK_UNINTERRUPTIBLE);
242 current->state = TASK_RUNNING;
243 remove_wait_queue(&destroy_wait, &__wait);
245 if (atomic_read(&clnt->cl_users) < 0) {
246 printk(KERN_ERR "RPC: rpc_shutdown_client clnt %p tasks=%d\n",
247 clnt, atomic_read(&clnt->cl_users));
254 return rpc_destroy_client(clnt);
258 * Delete an RPC client
261 rpc_destroy_client(struct rpc_clnt *clnt)
263 if (!atomic_dec_and_test(&clnt->cl_count))
265 BUG_ON(atomic_read(&clnt->cl_users) != 0);
267 dprintk("RPC: destroying %s client for %s\n",
268 clnt->cl_protname, clnt->cl_server);
270 rpcauth_destroy(clnt->cl_auth);
271 clnt->cl_auth = NULL;
273 if (clnt->cl_parent != clnt) {
274 rpc_destroy_client(clnt->cl_parent);
277 if (clnt->cl_pathname[0])
278 rpc_rmdir(clnt->cl_pathname);
280 xprt_destroy(clnt->cl_xprt);
281 clnt->cl_xprt = NULL;
283 if (clnt->cl_server != clnt->cl_inline_name)
284 kfree(clnt->cl_server);
291 * Release an RPC client
294 rpc_release_client(struct rpc_clnt *clnt)
296 dprintk("RPC: rpc_release_client(%p, %d)\n",
297 clnt, atomic_read(&clnt->cl_users));
299 if (!atomic_dec_and_test(&clnt->cl_users))
301 wake_up(&destroy_wait);
302 if (clnt->cl_oneshot || clnt->cl_dead)
303 rpc_destroy_client(clnt);
307 * Default callback for async RPC calls
310 rpc_default_callback(struct rpc_task *task)
315 * Export the signal mask handling for aysnchronous code that
316 * sleeps on RPC calls
319 void rpc_clnt_sigmask(struct rpc_clnt *clnt, sigset_t *oldset)
321 unsigned long sigallow = sigmask(SIGKILL);
322 unsigned long irqflags;
324 /* Turn off various signals */
326 struct k_sigaction *action = current->sighand->action;
327 if (action[SIGINT-1].sa.sa_handler == SIG_DFL)
328 sigallow |= sigmask(SIGINT);
329 if (action[SIGQUIT-1].sa.sa_handler == SIG_DFL)
330 sigallow |= sigmask(SIGQUIT);
332 spin_lock_irqsave(¤t->sighand->siglock, irqflags);
333 *oldset = current->blocked;
334 siginitsetinv(¤t->blocked, sigallow & ~oldset->sig[0]);
336 spin_unlock_irqrestore(¤t->sighand->siglock, irqflags);
339 void rpc_clnt_sigunmask(struct rpc_clnt *clnt, sigset_t *oldset)
341 unsigned long irqflags;
343 spin_lock_irqsave(¤t->sighand->siglock, irqflags);
344 current->blocked = *oldset;
346 spin_unlock_irqrestore(¤t->sighand->siglock, irqflags);
350 * New rpc_call implementation
352 int rpc_call_sync(struct rpc_clnt *clnt, struct rpc_message *msg, int flags)
354 struct rpc_task *task;
358 /* If this client is slain all further I/O fails */
362 BUG_ON(flags & RPC_TASK_ASYNC);
364 rpc_clnt_sigmask(clnt, &oldset);
367 task = rpc_new_task(clnt, NULL, flags);
371 rpc_call_setup(task, msg, 0);
373 /* Set up the call info struct and execute the task */
374 if (task->tk_status == 0)
375 status = rpc_execute(task);
377 status = task->tk_status;
378 rpc_release_task(task);
382 rpc_clnt_sigunmask(clnt, &oldset);
388 * New rpc_call implementation
391 rpc_call_async(struct rpc_clnt *clnt, struct rpc_message *msg, int flags,
392 rpc_action callback, void *data)
394 struct rpc_task *task;
398 /* If this client is slain all further I/O fails */
402 flags |= RPC_TASK_ASYNC;
404 rpc_clnt_sigmask(clnt, &oldset);
406 /* Create/initialize a new RPC task */
408 callback = rpc_default_callback;
410 if (!(task = rpc_new_task(clnt, callback, flags)))
412 task->tk_calldata = data;
414 rpc_call_setup(task, msg, 0);
416 /* Set up the call info struct and execute the task */
417 status = task->tk_status;
421 rpc_release_task(task);
424 rpc_clnt_sigunmask(clnt, &oldset);
431 rpc_call_setup(struct rpc_task *task, struct rpc_message *msg, int flags)
434 task->tk_flags |= flags;
435 /* Bind the user cred */
436 if (task->tk_msg.rpc_cred != NULL)
437 rpcauth_holdcred(task);
439 rpcauth_bindcred(task);
441 if (task->tk_status == 0)
442 task->tk_action = call_start;
444 task->tk_action = NULL;
448 rpc_setbufsize(struct rpc_clnt *clnt, unsigned int sndsize, unsigned int rcvsize)
450 struct rpc_xprt *xprt = clnt->cl_xprt;
454 xprt->sndsize = sndsize + RPC_SLACK_SPACE;
457 xprt->rcvsize = rcvsize + RPC_SLACK_SPACE;
458 if (xprt_connected(xprt))
459 xprt_sock_setbufsize(xprt);
463 * Return size of largest payload RPC client can support, in bytes
465 * For stream transports, this is one RPC record fragment (see RFC
466 * 1831), as we don't support multi-record requests yet. For datagram
467 * transports, this is the size of an IP packet minus the IP, UDP, and
470 size_t rpc_max_payload(struct rpc_clnt *clnt)
472 return clnt->cl_xprt->max_payload;
474 EXPORT_SYMBOL(rpc_max_payload);
477 * Restart an (async) RPC call. Usually called from within the
481 rpc_restart_call(struct rpc_task *task)
483 if (RPC_ASSASSINATED(task))
486 task->tk_action = call_start;
492 * Other FSM states can be visited zero or more times, but
493 * this state is visited exactly once for each RPC.
496 call_start(struct rpc_task *task)
498 struct rpc_clnt *clnt = task->tk_client;
500 dprintk("RPC: %4d call_start %s%d proc %d (%s)\n", task->tk_pid,
501 clnt->cl_protname, clnt->cl_vers, task->tk_msg.rpc_proc->p_proc,
502 (RPC_IS_ASYNC(task) ? "async" : "sync"));
504 /* Increment call count */
505 task->tk_msg.rpc_proc->p_count++;
506 clnt->cl_stats->rpccnt++;
507 task->tk_action = call_reserve;
511 * 1. Reserve an RPC call slot
514 call_reserve(struct rpc_task *task)
516 dprintk("RPC: %4d call_reserve\n", task->tk_pid);
518 if (!rpcauth_uptodatecred(task)) {
519 task->tk_action = call_refresh;
524 task->tk_action = call_reserveresult;
529 * 1b. Grok the result of xprt_reserve()
532 call_reserveresult(struct rpc_task *task)
534 int status = task->tk_status;
536 dprintk("RPC: %4d call_reserveresult (status %d)\n",
537 task->tk_pid, task->tk_status);
540 * After a call to xprt_reserve(), we must have either
541 * a request slot or else an error status.
545 if (task->tk_rqstp) {
546 task->tk_action = call_allocate;
550 printk(KERN_ERR "%s: status=%d, but no request slot, exiting\n",
551 __FUNCTION__, status);
552 rpc_exit(task, -EIO);
557 * Even though there was an error, we may have acquired
558 * a request slot somehow. Make sure not to leak it.
560 if (task->tk_rqstp) {
561 printk(KERN_ERR "%s: status=%d, request allocated anyway\n",
562 __FUNCTION__, status);
567 case -EAGAIN: /* woken up; retry */
568 task->tk_action = call_reserve;
570 case -EIO: /* probably a shutdown */
573 printk(KERN_ERR "%s: unrecognized error %d, exiting\n",
574 __FUNCTION__, status);
577 rpc_exit(task, status);
581 * 2. Allocate the buffer. For details, see sched.c:rpc_malloc.
582 * (Note: buffer memory is freed in rpc_task_release).
585 call_allocate(struct rpc_task *task)
589 dprintk("RPC: %4d call_allocate (status %d)\n",
590 task->tk_pid, task->tk_status);
591 task->tk_action = call_bind;
595 /* FIXME: compute buffer requirements more exactly using
597 bufsiz = task->tk_msg.rpc_proc->p_bufsiz + RPC_SLACK_SPACE;
599 if (rpc_malloc(task, bufsiz << 1) != NULL)
601 printk(KERN_INFO "RPC: buffer allocation failed for task %p\n", task);
603 if (RPC_IS_ASYNC(task) || !(task->tk_client->cl_intr && signalled())) {
605 task->tk_action = call_reserve;
606 rpc_delay(task, HZ>>4);
610 rpc_exit(task, -ERESTARTSYS);
614 * 3. Encode arguments of an RPC call
617 call_encode(struct rpc_task *task)
619 struct rpc_clnt *clnt = task->tk_client;
620 struct rpc_rqst *req = task->tk_rqstp;
621 struct xdr_buf *sndbuf = &req->rq_snd_buf;
622 struct xdr_buf *rcvbuf = &req->rq_rcv_buf;
628 dprintk("RPC: %4d call_encode (status %d)\n",
629 task->tk_pid, task->tk_status);
631 /* Default buffer setup */
632 bufsiz = task->tk_bufsize >> 1;
633 sndbuf->head[0].iov_base = (void *)task->tk_buffer;
634 sndbuf->head[0].iov_len = bufsiz;
635 sndbuf->tail[0].iov_len = 0;
636 sndbuf->page_len = 0;
638 sndbuf->buflen = bufsiz;
639 rcvbuf->head[0].iov_base = (void *)((char *)task->tk_buffer + bufsiz);
640 rcvbuf->head[0].iov_len = bufsiz;
641 rcvbuf->tail[0].iov_len = 0;
642 rcvbuf->page_len = 0;
644 rcvbuf->buflen = bufsiz;
646 /* Encode header and provided arguments */
647 encode = task->tk_msg.rpc_proc->p_encode;
648 if (!(p = call_header(task))) {
649 printk(KERN_INFO "RPC: call_header failed, exit EIO\n");
650 rpc_exit(task, -EIO);
653 if (encode && (status = rpcauth_wrap_req(task, encode, req, p,
654 task->tk_msg.rpc_argp)) < 0) {
655 printk(KERN_WARNING "%s: can't encode arguments: %d\n",
656 clnt->cl_protname, -status);
657 rpc_exit(task, status);
662 * 4. Get the server port number if not yet set
665 call_bind(struct rpc_task *task)
667 struct rpc_clnt *clnt = task->tk_client;
668 struct rpc_xprt *xprt = clnt->cl_xprt;
670 dprintk("RPC: %4d call_bind xprt %p %s connected\n", task->tk_pid,
671 xprt, (xprt_connected(xprt) ? "is" : "is not"));
673 task->tk_action = (xprt_connected(xprt)) ? call_transmit : call_connect;
675 if (!clnt->cl_port) {
676 task->tk_action = call_connect;
677 task->tk_timeout = RPC_CONNECT_TIMEOUT;
678 rpc_getport(task, clnt);
683 * 4a. Connect to the RPC server (TCP case)
686 call_connect(struct rpc_task *task)
688 struct rpc_clnt *clnt = task->tk_client;
690 dprintk("RPC: %4d call_connect status %d\n",
691 task->tk_pid, task->tk_status);
693 if (xprt_connected(clnt->cl_xprt)) {
694 task->tk_action = call_transmit;
697 task->tk_action = call_connect_status;
698 if (task->tk_status < 0)
704 * 4b. Sort out connect result
707 call_connect_status(struct rpc_task *task)
709 struct rpc_clnt *clnt = task->tk_client;
710 int status = task->tk_status;
714 clnt->cl_stats->netreconn++;
715 task->tk_action = call_transmit;
719 /* Something failed: we may have to rebind */
720 if (clnt->cl_autobind)
726 task->tk_action = (clnt->cl_port == 0) ? call_bind : call_connect;
729 rpc_exit(task, -EIO);
734 * 5. Transmit the RPC request, and wait for reply
737 call_transmit(struct rpc_task *task)
739 dprintk("RPC: %4d call_transmit (status %d)\n",
740 task->tk_pid, task->tk_status);
742 task->tk_action = call_status;
743 if (task->tk_status < 0)
745 task->tk_status = xprt_prepare_transmit(task);
746 if (task->tk_status != 0)
748 /* Encode here so that rpcsec_gss can use correct sequence number. */
749 if (!task->tk_rqstp->rq_bytes_sent)
751 if (task->tk_status < 0)
754 if (task->tk_status < 0)
756 if (!task->tk_msg.rpc_proc->p_decode) {
757 task->tk_action = NULL;
758 rpc_wake_up_task(task);
763 * 6. Sort out the RPC call status
766 call_status(struct rpc_task *task)
768 struct rpc_clnt *clnt = task->tk_client;
769 struct rpc_rqst *req = task->tk_rqstp;
772 if (req->rq_received > 0 && !req->rq_bytes_sent)
773 task->tk_status = req->rq_received;
775 dprintk("RPC: %4d call_status (status %d)\n",
776 task->tk_pid, task->tk_status);
778 status = task->tk_status;
780 task->tk_action = call_decode;
787 task->tk_action = call_timeout;
791 req->rq_bytes_sent = 0;
792 if (clnt->cl_autobind)
794 task->tk_action = call_bind;
797 task->tk_action = call_transmit;
800 /* shutdown or soft timeout */
801 rpc_exit(task, status);
805 printk("%s: RPC call returned error %d\n",
806 clnt->cl_protname, -status);
807 rpc_exit(task, status);
813 * 6a. Handle RPC timeout
814 * We do not release the request slot, so we keep using the
815 * same XID for all retransmits.
818 call_timeout(struct rpc_task *task)
820 struct rpc_clnt *clnt = task->tk_client;
822 if (xprt_adjust_timeout(task->tk_rqstp) == 0) {
823 dprintk("RPC: %4d call_timeout (minor)\n", task->tk_pid);
827 dprintk("RPC: %4d call_timeout (major)\n", task->tk_pid);
828 if (RPC_IS_SOFT(task)) {
830 printk(KERN_NOTICE "%s: server %s not responding, timed out\n",
831 clnt->cl_protname, clnt->cl_server);
832 rpc_exit(task, -EIO);
836 if (clnt->cl_chatty && !(task->tk_flags & RPC_CALL_MAJORSEEN)) {
837 task->tk_flags |= RPC_CALL_MAJORSEEN;
838 printk(KERN_NOTICE "%s: server %s not responding, still trying\n",
839 clnt->cl_protname, clnt->cl_server);
841 if (clnt->cl_autobind)
845 clnt->cl_stats->rpcretrans++;
846 task->tk_action = call_bind;
851 * 7. Decode the RPC reply
854 call_decode(struct rpc_task *task)
856 struct rpc_clnt *clnt = task->tk_client;
857 struct rpc_rqst *req = task->tk_rqstp;
858 kxdrproc_t decode = task->tk_msg.rpc_proc->p_decode;
861 dprintk("RPC: %4d call_decode (status %d)\n",
862 task->tk_pid, task->tk_status);
864 if (clnt->cl_chatty && (task->tk_flags & RPC_CALL_MAJORSEEN)) {
865 printk(KERN_NOTICE "%s: server %s OK\n",
866 clnt->cl_protname, clnt->cl_server);
867 task->tk_flags &= ~RPC_CALL_MAJORSEEN;
870 if (task->tk_status < 12) {
871 if (!RPC_IS_SOFT(task)) {
872 task->tk_action = call_bind;
873 clnt->cl_stats->rpcretrans++;
876 printk(KERN_WARNING "%s: too small RPC reply size (%d bytes)\n",
877 clnt->cl_protname, task->tk_status);
878 rpc_exit(task, -EIO);
882 req->rq_rcv_buf.len = req->rq_private_buf.len;
884 /* Check that the softirq receive buffer is valid */
885 WARN_ON(memcmp(&req->rq_rcv_buf, &req->rq_private_buf,
886 sizeof(req->rq_rcv_buf)) != 0);
888 /* Verify the RPC header */
889 if (!(p = call_verify(task))) {
890 if (task->tk_action == NULL)
895 task->tk_action = NULL;
898 task->tk_status = rpcauth_unwrap_resp(task, decode, req, p,
899 task->tk_msg.rpc_resp);
900 dprintk("RPC: %4d call_decode result %d\n", task->tk_pid,
904 req->rq_received = req->rq_private_buf.len = 0;
909 * 8. Refresh the credentials if rejected by the server
912 call_refresh(struct rpc_task *task)
914 dprintk("RPC: %4d call_refresh\n", task->tk_pid);
916 xprt_release(task); /* Must do to obtain new XID */
917 task->tk_action = call_refreshresult;
919 task->tk_client->cl_stats->rpcauthrefresh++;
920 rpcauth_refreshcred(task);
924 * 8a. Process the results of a credential refresh
927 call_refreshresult(struct rpc_task *task)
929 int status = task->tk_status;
930 dprintk("RPC: %4d call_refreshresult (status %d)\n",
931 task->tk_pid, task->tk_status);
934 task->tk_action = call_reserve;
935 if (status >= 0 && rpcauth_uptodatecred(task))
937 if (status == -EACCES) {
938 rpc_exit(task, -EACCES);
941 task->tk_action = call_refresh;
942 if (status != -ETIMEDOUT)
943 rpc_delay(task, 3*HZ);
948 * Call header serialization
951 call_header(struct rpc_task *task)
953 struct rpc_clnt *clnt = task->tk_client;
954 struct rpc_xprt *xprt = clnt->cl_xprt;
955 struct rpc_rqst *req = task->tk_rqstp;
956 u32 *p = req->rq_svec[0].iov_base;
958 /* FIXME: check buffer size? */
960 *p++ = 0; /* fill in later */
961 *p++ = req->rq_xid; /* XID */
962 *p++ = htonl(RPC_CALL); /* CALL */
963 *p++ = htonl(RPC_VERSION); /* RPC version */
964 *p++ = htonl(clnt->cl_prog); /* program number */
965 *p++ = htonl(clnt->cl_vers); /* program version */
966 *p++ = htonl(task->tk_msg.rpc_proc->p_proc); /* procedure */
967 return rpcauth_marshcred(task, p);
971 * Reply header verification
974 call_verify(struct rpc_task *task)
976 struct kvec *iov = &task->tk_rqstp->rq_rcv_buf.head[0];
977 int len = task->tk_rqstp->rq_rcv_buf.len >> 2;
978 u32 *p = iov->iov_base, n;
983 p += 1; /* skip XID */
985 if ((n = ntohl(*p++)) != RPC_REPLY) {
986 printk(KERN_WARNING "call_verify: not an RPC reply: %x\n", n);
989 if ((n = ntohl(*p++)) != RPC_MSG_ACCEPTED) {
992 switch ((n = ntohl(*p++))) {
996 printk(KERN_WARNING "%s: RPC call version mismatch!\n", __FUNCTION__);
999 printk(KERN_WARNING "%s: RPC call rejected, unknown error: %x\n", __FUNCTION__, n);
1004 switch ((n = ntohl(*p++))) {
1005 case RPC_AUTH_REJECTEDCRED:
1006 case RPC_AUTH_REJECTEDVERF:
1007 case RPCSEC_GSS_CREDPROBLEM:
1008 case RPCSEC_GSS_CTXPROBLEM:
1009 if (!task->tk_cred_retry)
1011 task->tk_cred_retry--;
1012 dprintk("RPC: %4d call_verify: retry stale creds\n",
1014 rpcauth_invalcred(task);
1015 task->tk_action = call_refresh;
1017 case RPC_AUTH_BADCRED:
1018 case RPC_AUTH_BADVERF:
1019 /* possibly garbled cred/verf? */
1020 if (!task->tk_garb_retry)
1022 task->tk_garb_retry--;
1023 dprintk("RPC: %4d call_verify: retry garbled creds\n",
1025 task->tk_action = call_bind;
1027 case RPC_AUTH_TOOWEAK:
1028 printk(KERN_NOTICE "call_verify: server requires stronger "
1029 "authentication.\n");
1032 printk(KERN_WARNING "call_verify: unknown auth error: %x\n", n);
1035 dprintk("RPC: %4d call_verify: call rejected %d\n",
1039 if (!(p = rpcauth_checkverf(task, p))) {
1040 printk(KERN_WARNING "call_verify: auth check failed\n");
1041 goto out_retry; /* bad verifier, retry */
1043 len = p - (u32 *)iov->iov_base - 1;
1046 switch ((n = ntohl(*p++))) {
1049 case RPC_PROG_UNAVAIL:
1050 printk(KERN_WARNING "RPC: call_verify: program %u is unsupported by server %s\n",
1051 (unsigned int)task->tk_client->cl_prog,
1052 task->tk_client->cl_server);
1054 case RPC_PROG_MISMATCH:
1055 printk(KERN_WARNING "RPC: call_verify: program %u, version %u unsupported by server %s\n",
1056 (unsigned int)task->tk_client->cl_prog,
1057 (unsigned int)task->tk_client->cl_vers,
1058 task->tk_client->cl_server);
1060 case RPC_PROC_UNAVAIL:
1061 printk(KERN_WARNING "RPC: call_verify: proc %p unsupported by program %u, version %u on server %s\n",
1062 task->tk_msg.rpc_proc,
1063 task->tk_client->cl_prog,
1064 task->tk_client->cl_vers,
1065 task->tk_client->cl_server);
1067 case RPC_GARBAGE_ARGS:
1068 dprintk("RPC: %4d %s: server saw garbage\n", task->tk_pid, __FUNCTION__);
1071 printk(KERN_WARNING "call_verify: server accept status: %x\n", n);
1076 task->tk_client->cl_stats->rpcgarbage++;
1077 if (task->tk_garb_retry) {
1078 task->tk_garb_retry--;
1079 dprintk(KERN_WARNING "RPC %s: retrying %4d\n", __FUNCTION__, task->tk_pid);
1080 task->tk_action = call_bind;
1083 printk(KERN_WARNING "RPC %s: retry failed, exit EIO\n", __FUNCTION__);
1087 rpc_exit(task, error);
1090 printk(KERN_WARNING "RPC %s: server reply was truncated.\n", __FUNCTION__);