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)
217 dprintk("RPC: shutting down %s client for %s, tasks=%d\n",
218 clnt->cl_protname, clnt->cl_server,
219 atomic_read(&clnt->cl_users));
221 while (atomic_read(&clnt->cl_users) > 0) {
222 /* Don't let rpc_release_client destroy us */
223 clnt->cl_oneshot = 0;
225 rpc_killall_tasks(clnt);
226 sleep_on_timeout(&destroy_wait, 1*HZ);
229 if (atomic_read(&clnt->cl_users) < 0) {
230 printk(KERN_ERR "RPC: rpc_shutdown_client clnt %p tasks=%d\n",
231 clnt, atomic_read(&clnt->cl_users));
238 return rpc_destroy_client(clnt);
242 * Delete an RPC client
245 rpc_destroy_client(struct rpc_clnt *clnt)
247 if (!atomic_dec_and_test(&clnt->cl_count))
249 BUG_ON(atomic_read(&clnt->cl_users) != 0);
251 dprintk("RPC: destroying %s client for %s\n",
252 clnt->cl_protname, clnt->cl_server);
254 rpcauth_destroy(clnt->cl_auth);
255 clnt->cl_auth = NULL;
257 if (clnt->cl_parent != clnt) {
258 rpc_destroy_client(clnt->cl_parent);
261 if (clnt->cl_pathname[0])
262 rpc_rmdir(clnt->cl_pathname);
264 xprt_destroy(clnt->cl_xprt);
265 clnt->cl_xprt = NULL;
267 if (clnt->cl_server != clnt->cl_inline_name)
268 kfree(clnt->cl_server);
275 * Release an RPC client
278 rpc_release_client(struct rpc_clnt *clnt)
280 dprintk("RPC: rpc_release_client(%p, %d)\n",
281 clnt, atomic_read(&clnt->cl_users));
283 if (!atomic_dec_and_test(&clnt->cl_users))
285 wake_up(&destroy_wait);
286 if (clnt->cl_oneshot || clnt->cl_dead)
287 rpc_destroy_client(clnt);
291 * Default callback for async RPC calls
294 rpc_default_callback(struct rpc_task *task)
299 * Export the signal mask handling for aysnchronous code that
300 * sleeps on RPC calls
303 void rpc_clnt_sigmask(struct rpc_clnt *clnt, sigset_t *oldset)
305 unsigned long sigallow = sigmask(SIGKILL);
306 unsigned long irqflags;
308 /* Turn off various signals */
310 struct k_sigaction *action = current->sighand->action;
311 if (action[SIGINT-1].sa.sa_handler == SIG_DFL)
312 sigallow |= sigmask(SIGINT);
313 if (action[SIGQUIT-1].sa.sa_handler == SIG_DFL)
314 sigallow |= sigmask(SIGQUIT);
316 spin_lock_irqsave(¤t->sighand->siglock, irqflags);
317 *oldset = current->blocked;
318 siginitsetinv(¤t->blocked, sigallow & ~oldset->sig[0]);
320 spin_unlock_irqrestore(¤t->sighand->siglock, irqflags);
323 void rpc_clnt_sigunmask(struct rpc_clnt *clnt, sigset_t *oldset)
325 unsigned long irqflags;
327 spin_lock_irqsave(¤t->sighand->siglock, irqflags);
328 current->blocked = *oldset;
330 spin_unlock_irqrestore(¤t->sighand->siglock, irqflags);
334 * New rpc_call implementation
336 int rpc_call_sync(struct rpc_clnt *clnt, struct rpc_message *msg, int flags)
338 struct rpc_task my_task, *task = &my_task;
342 /* If this client is slain all further I/O fails */
346 if (flags & RPC_TASK_ASYNC) {
347 printk("rpc_call_sync: Illegal flag combination for synchronous task\n");
348 flags &= ~RPC_TASK_ASYNC;
351 rpc_clnt_sigmask(clnt, &oldset);
353 /* Create/initialize a new RPC task */
354 rpc_init_task(task, clnt, NULL, flags);
355 rpc_call_setup(task, msg, 0);
357 /* Set up the call info struct and execute the task */
358 if (task->tk_status == 0)
359 status = rpc_execute(task);
361 status = task->tk_status;
362 rpc_release_task(task);
365 rpc_clnt_sigunmask(clnt, &oldset);
371 * New rpc_call implementation
374 rpc_call_async(struct rpc_clnt *clnt, struct rpc_message *msg, int flags,
375 rpc_action callback, void *data)
377 struct rpc_task *task;
381 /* If this client is slain all further I/O fails */
385 flags |= RPC_TASK_ASYNC;
387 rpc_clnt_sigmask(clnt, &oldset);
389 /* Create/initialize a new RPC task */
391 callback = rpc_default_callback;
393 if (!(task = rpc_new_task(clnt, callback, flags)))
395 task->tk_calldata = data;
397 rpc_call_setup(task, msg, 0);
399 /* Set up the call info struct and execute the task */
400 if (task->tk_status == 0)
401 status = rpc_execute(task);
403 status = task->tk_status;
404 rpc_release_task(task);
408 rpc_clnt_sigunmask(clnt, &oldset);
415 rpc_call_setup(struct rpc_task *task, struct rpc_message *msg, int flags)
418 task->tk_flags |= flags;
419 /* Bind the user cred */
420 if (task->tk_msg.rpc_cred != NULL) {
421 rpcauth_holdcred(task);
423 rpcauth_bindcred(task);
425 if (task->tk_status == 0)
426 task->tk_action = call_start;
428 task->tk_action = NULL;
432 rpc_setbufsize(struct rpc_clnt *clnt, unsigned int sndsize, unsigned int rcvsize)
434 struct rpc_xprt *xprt = clnt->cl_xprt;
438 xprt->sndsize = sndsize + RPC_SLACK_SPACE;
441 xprt->rcvsize = rcvsize + RPC_SLACK_SPACE;
442 if (xprt_connected(xprt))
443 xprt_sock_setbufsize(xprt);
447 * Restart an (async) RPC call. Usually called from within the
451 rpc_restart_call(struct rpc_task *task)
453 if (RPC_ASSASSINATED(task))
456 task->tk_action = call_start;
462 * Other FSM states can be visited zero or more times, but
463 * this state is visited exactly once for each RPC.
466 call_start(struct rpc_task *task)
468 struct rpc_clnt *clnt = task->tk_client;
470 dprintk("RPC: %4d call_start %s%d proc %d (%s)\n", task->tk_pid,
471 clnt->cl_protname, clnt->cl_vers, task->tk_msg.rpc_proc->p_proc,
472 (RPC_IS_ASYNC(task) ? "async" : "sync"));
474 /* Increment call count */
475 task->tk_msg.rpc_proc->p_count++;
476 clnt->cl_stats->rpccnt++;
477 task->tk_action = call_reserve;
481 * 1. Reserve an RPC call slot
484 call_reserve(struct rpc_task *task)
486 dprintk("RPC: %4d call_reserve\n", task->tk_pid);
488 if (!rpcauth_uptodatecred(task)) {
489 task->tk_action = call_refresh;
494 task->tk_action = call_reserveresult;
499 * 1b. Grok the result of xprt_reserve()
502 call_reserveresult(struct rpc_task *task)
504 int status = task->tk_status;
506 dprintk("RPC: %4d call_reserveresult (status %d)\n",
507 task->tk_pid, task->tk_status);
510 * After a call to xprt_reserve(), we must have either
511 * a request slot or else an error status.
515 if (task->tk_rqstp) {
516 task->tk_action = call_allocate;
520 printk(KERN_ERR "%s: status=%d, but no request slot, exiting\n",
521 __FUNCTION__, status);
522 rpc_exit(task, -EIO);
527 * Even though there was an error, we may have acquired
528 * a request slot somehow. Make sure not to leak it.
530 if (task->tk_rqstp) {
531 printk(KERN_ERR "%s: status=%d, request allocated anyway\n",
532 __FUNCTION__, status);
537 case -EAGAIN: /* woken up; retry */
538 task->tk_action = call_reserve;
540 case -EIO: /* probably a shutdown */
543 printk(KERN_ERR "%s: unrecognized error %d, exiting\n",
544 __FUNCTION__, status);
547 rpc_exit(task, status);
551 * 2. Allocate the buffer. For details, see sched.c:rpc_malloc.
552 * (Note: buffer memory is freed in rpc_task_release).
555 call_allocate(struct rpc_task *task)
559 dprintk("RPC: %4d call_allocate (status %d)\n",
560 task->tk_pid, task->tk_status);
561 task->tk_action = call_bind;
565 /* FIXME: compute buffer requirements more exactly using
567 bufsiz = task->tk_msg.rpc_proc->p_bufsiz + RPC_SLACK_SPACE;
569 if (rpc_malloc(task, bufsiz << 1) != NULL)
571 printk(KERN_INFO "RPC: buffer allocation failed for task %p\n", task);
573 if (RPC_IS_ASYNC(task) || !(task->tk_client->cl_intr && signalled())) {
575 task->tk_action = call_reserve;
576 rpc_delay(task, HZ>>4);
580 rpc_exit(task, -ERESTARTSYS);
584 * 3. Encode arguments of an RPC call
587 call_encode(struct rpc_task *task)
589 struct rpc_clnt *clnt = task->tk_client;
590 struct rpc_rqst *req = task->tk_rqstp;
591 struct xdr_buf *sndbuf = &req->rq_snd_buf;
592 struct xdr_buf *rcvbuf = &req->rq_rcv_buf;
598 dprintk("RPC: %4d call_encode (status %d)\n",
599 task->tk_pid, task->tk_status);
601 /* Default buffer setup */
602 bufsiz = task->tk_bufsize >> 1;
603 sndbuf->head[0].iov_base = (void *)task->tk_buffer;
604 sndbuf->head[0].iov_len = bufsiz;
605 sndbuf->tail[0].iov_len = 0;
606 sndbuf->page_len = 0;
608 sndbuf->buflen = bufsiz;
609 rcvbuf->head[0].iov_base = (void *)((char *)task->tk_buffer + bufsiz);
610 rcvbuf->head[0].iov_len = bufsiz;
611 rcvbuf->tail[0].iov_len = 0;
612 rcvbuf->page_len = 0;
614 rcvbuf->buflen = bufsiz;
616 /* Encode header and provided arguments */
617 encode = task->tk_msg.rpc_proc->p_encode;
618 if (!(p = call_header(task))) {
619 printk(KERN_INFO "RPC: call_header failed, exit EIO\n");
620 rpc_exit(task, -EIO);
623 if (encode && (status = rpcauth_wrap_req(task, encode, req, p,
624 task->tk_msg.rpc_argp)) < 0) {
625 printk(KERN_WARNING "%s: can't encode arguments: %d\n",
626 clnt->cl_protname, -status);
627 rpc_exit(task, status);
632 * 4. Get the server port number if not yet set
635 call_bind(struct rpc_task *task)
637 struct rpc_clnt *clnt = task->tk_client;
638 struct rpc_xprt *xprt = clnt->cl_xprt;
640 dprintk("RPC: %4d call_bind xprt %p %s connected\n", task->tk_pid,
641 xprt, (xprt_connected(xprt) ? "is" : "is not"));
643 task->tk_action = (xprt_connected(xprt)) ? call_transmit : call_connect;
645 if (!clnt->cl_port) {
646 task->tk_action = call_connect;
647 task->tk_timeout = RPC_CONNECT_TIMEOUT;
648 rpc_getport(task, clnt);
653 * 4a. Connect to the RPC server (TCP case)
656 call_connect(struct rpc_task *task)
658 struct rpc_clnt *clnt = task->tk_client;
660 dprintk("RPC: %4d call_connect status %d\n",
661 task->tk_pid, task->tk_status);
663 if (xprt_connected(clnt->cl_xprt)) {
664 task->tk_action = call_transmit;
667 task->tk_action = call_connect_status;
668 if (task->tk_status < 0)
674 * 4b. Sort out connect result
677 call_connect_status(struct rpc_task *task)
679 struct rpc_clnt *clnt = task->tk_client;
680 int status = task->tk_status;
684 clnt->cl_stats->netreconn++;
685 task->tk_action = call_transmit;
689 /* Something failed: we may have to rebind */
690 if (clnt->cl_autobind)
696 task->tk_action = (clnt->cl_port == 0) ? call_bind : call_connect;
699 rpc_exit(task, -EIO);
704 * 5. Transmit the RPC request, and wait for reply
707 call_transmit(struct rpc_task *task)
709 dprintk("RPC: %4d call_transmit (status %d)\n",
710 task->tk_pid, task->tk_status);
712 task->tk_action = call_status;
713 if (task->tk_status < 0)
715 task->tk_status = xprt_prepare_transmit(task);
716 if (task->tk_status != 0)
718 /* Encode here so that rpcsec_gss can use correct sequence number. */
719 if (!task->tk_rqstp->rq_bytes_sent)
721 if (task->tk_status < 0)
724 if (task->tk_status < 0)
726 if (!task->tk_msg.rpc_proc->p_decode) {
727 task->tk_action = NULL;
728 rpc_wake_up_task(task);
733 * 6. Sort out the RPC call status
736 call_status(struct rpc_task *task)
738 struct rpc_clnt *clnt = task->tk_client;
739 struct rpc_rqst *req = task->tk_rqstp;
742 if (req->rq_received > 0 && !req->rq_bytes_sent)
743 task->tk_status = req->rq_received;
745 dprintk("RPC: %4d call_status (status %d)\n",
746 task->tk_pid, task->tk_status);
748 status = task->tk_status;
750 task->tk_action = call_decode;
757 task->tk_action = call_timeout;
761 req->rq_bytes_sent = 0;
762 if (clnt->cl_autobind)
764 task->tk_action = call_bind;
767 task->tk_action = call_transmit;
770 /* shutdown or soft timeout */
771 rpc_exit(task, status);
775 printk("%s: RPC call returned error %d\n",
776 clnt->cl_protname, -status);
777 rpc_exit(task, status);
783 * 6a. Handle RPC timeout
784 * We do not release the request slot, so we keep using the
785 * same XID for all retransmits.
788 call_timeout(struct rpc_task *task)
790 struct rpc_clnt *clnt = task->tk_client;
792 if (xprt_adjust_timeout(task->tk_rqstp) == 0) {
793 dprintk("RPC: %4d call_timeout (minor)\n", task->tk_pid);
797 dprintk("RPC: %4d call_timeout (major)\n", task->tk_pid);
798 if (RPC_IS_SOFT(task)) {
800 printk(KERN_NOTICE "%s: server %s not responding, timed out\n",
801 clnt->cl_protname, clnt->cl_server);
802 rpc_exit(task, -EIO);
806 if (clnt->cl_chatty && !(task->tk_flags & RPC_CALL_MAJORSEEN)) {
807 task->tk_flags |= RPC_CALL_MAJORSEEN;
808 printk(KERN_NOTICE "%s: server %s not responding, still trying\n",
809 clnt->cl_protname, clnt->cl_server);
811 if (clnt->cl_autobind)
815 clnt->cl_stats->rpcretrans++;
816 task->tk_action = call_bind;
821 * 7. Decode the RPC reply
824 call_decode(struct rpc_task *task)
826 struct rpc_clnt *clnt = task->tk_client;
827 struct rpc_rqst *req = task->tk_rqstp;
828 kxdrproc_t decode = task->tk_msg.rpc_proc->p_decode;
831 dprintk("RPC: %4d call_decode (status %d)\n",
832 task->tk_pid, task->tk_status);
834 if (clnt->cl_chatty && (task->tk_flags & RPC_CALL_MAJORSEEN)) {
835 printk(KERN_NOTICE "%s: server %s OK\n",
836 clnt->cl_protname, clnt->cl_server);
837 task->tk_flags &= ~RPC_CALL_MAJORSEEN;
840 if (task->tk_status < 12) {
841 if (!RPC_IS_SOFT(task)) {
842 task->tk_action = call_bind;
843 clnt->cl_stats->rpcretrans++;
846 printk(KERN_WARNING "%s: too small RPC reply size (%d bytes)\n",
847 clnt->cl_protname, task->tk_status);
848 rpc_exit(task, -EIO);
852 req->rq_rcv_buf.len = req->rq_private_buf.len;
854 /* Check that the softirq receive buffer is valid */
855 WARN_ON(memcmp(&req->rq_rcv_buf, &req->rq_private_buf,
856 sizeof(req->rq_rcv_buf)) != 0);
858 /* Verify the RPC header */
859 if (!(p = call_verify(task))) {
860 if (task->tk_action == NULL)
866 * The following is an NFS-specific hack to cater for setuid
867 * processes whose uid is mapped to nobody on the server.
869 if (task->tk_client->cl_droppriv &&
870 (ntohl(*p) == NFSERR_ACCES || ntohl(*p) == NFSERR_PERM)) {
871 if (RPC_IS_SETUID(task) && task->tk_suid_retry) {
872 dprintk("RPC: %4d retry squashed uid\n", task->tk_pid);
873 task->tk_flags ^= RPC_CALL_REALUID;
874 task->tk_action = call_bind;
875 task->tk_suid_retry--;
880 task->tk_action = NULL;
883 task->tk_status = rpcauth_unwrap_resp(task, decode, req, p,
884 task->tk_msg.rpc_resp);
885 dprintk("RPC: %4d call_decode result %d\n", task->tk_pid,
889 req->rq_received = req->rq_private_buf.len = 0;
894 * 8. Refresh the credentials if rejected by the server
897 call_refresh(struct rpc_task *task)
899 dprintk("RPC: %4d call_refresh\n", task->tk_pid);
901 xprt_release(task); /* Must do to obtain new XID */
902 task->tk_action = call_refreshresult;
904 task->tk_client->cl_stats->rpcauthrefresh++;
905 rpcauth_refreshcred(task);
909 * 8a. Process the results of a credential refresh
912 call_refreshresult(struct rpc_task *task)
914 int status = task->tk_status;
915 dprintk("RPC: %4d call_refreshresult (status %d)\n",
916 task->tk_pid, task->tk_status);
919 task->tk_action = call_reserve;
920 if (status >= 0 && rpcauth_uptodatecred(task))
922 if (rpcauth_deadcred(task)) {
923 rpc_exit(task, -EACCES);
926 task->tk_action = call_refresh;
927 if (status != -ETIMEDOUT)
928 rpc_delay(task, 3*HZ);
933 * Call header serialization
936 call_header(struct rpc_task *task)
938 struct rpc_clnt *clnt = task->tk_client;
939 struct rpc_xprt *xprt = clnt->cl_xprt;
940 struct rpc_rqst *req = task->tk_rqstp;
941 u32 *p = req->rq_svec[0].iov_base;
943 /* FIXME: check buffer size? */
945 *p++ = 0; /* fill in later */
946 *p++ = req->rq_xid; /* XID */
947 *p++ = htonl(RPC_CALL); /* CALL */
948 *p++ = htonl(RPC_VERSION); /* RPC version */
949 *p++ = htonl(clnt->cl_prog); /* program number */
950 *p++ = htonl(clnt->cl_vers); /* program version */
951 *p++ = htonl(task->tk_msg.rpc_proc->p_proc); /* procedure */
952 return rpcauth_marshcred(task, p);
956 * Reply header verification
959 call_verify(struct rpc_task *task)
961 u32 *p = task->tk_rqstp->rq_rcv_buf.head[0].iov_base, n;
963 p += 1; /* skip XID */
965 if ((n = ntohl(*p++)) != RPC_REPLY) {
966 printk(KERN_WARNING "call_verify: not an RPC reply: %x\n", n);
969 if ((n = ntohl(*p++)) != RPC_MSG_ACCEPTED) {
972 if ((n = ntohl(*p++)) != RPC_AUTH_ERROR) {
973 printk(KERN_WARNING "call_verify: RPC call rejected: %x\n", n);
975 switch ((n = ntohl(*p++))) {
976 case RPC_AUTH_REJECTEDCRED:
977 case RPC_AUTH_REJECTEDVERF:
978 case RPCSEC_GSS_CREDPROBLEM:
979 case RPCSEC_GSS_CTXPROBLEM:
980 if (!task->tk_cred_retry)
982 task->tk_cred_retry--;
983 dprintk("RPC: %4d call_verify: retry stale creds\n",
985 rpcauth_invalcred(task);
986 task->tk_action = call_refresh;
988 case RPC_AUTH_BADCRED:
989 case RPC_AUTH_BADVERF:
990 /* possibly garbled cred/verf? */
991 if (!task->tk_garb_retry)
993 task->tk_garb_retry--;
994 dprintk("RPC: %4d call_verify: retry garbled creds\n",
996 task->tk_action = call_bind;
998 case RPC_AUTH_TOOWEAK:
999 printk(KERN_NOTICE "call_verify: server requires stronger "
1000 "authentication.\n");
1003 printk(KERN_WARNING "call_verify: unknown auth error: %x\n", n);
1006 dprintk("RPC: %4d call_verify: call rejected %d\n",
1008 rpc_exit(task, error);
1011 if (!(p = rpcauth_checkverf(task, p))) {
1012 printk(KERN_WARNING "call_verify: auth check failed\n");
1013 goto garbage; /* bad verifier, retry */
1015 switch ((n = ntohl(*p++))) {
1018 case RPC_PROG_UNAVAIL:
1019 printk(KERN_WARNING "RPC: call_verify: program %u is unsupported by server %s\n",
1020 (unsigned int)task->tk_client->cl_prog,
1021 task->tk_client->cl_server);
1023 case RPC_PROG_MISMATCH:
1024 printk(KERN_WARNING "RPC: call_verify: program %u, version %u unsupported by server %s\n",
1025 (unsigned int)task->tk_client->cl_prog,
1026 (unsigned int)task->tk_client->cl_vers,
1027 task->tk_client->cl_server);
1029 case RPC_PROC_UNAVAIL:
1030 printk(KERN_WARNING "RPC: call_verify: proc %p unsupported by program %u, version %u on server %s\n",
1031 task->tk_msg.rpc_proc,
1032 task->tk_client->cl_prog,
1033 task->tk_client->cl_vers,
1034 task->tk_client->cl_server);
1036 case RPC_GARBAGE_ARGS:
1039 printk(KERN_WARNING "call_verify: server accept status: %x\n", n);
1044 dprintk("RPC: %4d call_verify: server saw garbage\n", task->tk_pid);
1045 task->tk_client->cl_stats->rpcgarbage++;
1046 if (task->tk_garb_retry) {
1047 task->tk_garb_retry--;
1048 dprintk(KERN_WARNING "RPC: garbage, retrying %4d\n", task->tk_pid);
1049 task->tk_action = call_bind;
1052 printk(KERN_WARNING "RPC: garbage, exit EIO\n");
1054 rpc_exit(task, -EIO);