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/*
* linux/net/sunrpc/rpcclnt.c
*
* This file contains the high-level RPC interface.
* It is modeled as a finite state machine to support both synchronous
* and asynchronous requests.
*
* - RPC header generation and argument serialization.
* - Credential refresh.
* - TCP reconnect handling (when finished).
* - Retry of operation when it is suspected the operation failed because
* of uid squashing on the server, or when the credentials were stale
* and need to be refreshed, or when a packet was damaged in transit.
* This may be have to be moved to the VFS layer.
*
* NB: BSD uses a more intelligent approach to guessing when a request
* or reply has been lost by keeping the RTO estimate for each procedure.
* We currently make do with a constant timeout value.
*
* Copyright (C) 1992,1993 Rick Sladkey <jrs@world.std.com>
* Copyright (C) 1995,1996 Olaf Kirch <okir@monad.swb.de>
*/
#include <asm/system.h>
#include <linux/types.h>
#include <linux/mm.h>
#include <linux/slab.h>
#include <linux/in.h>
#include <linux/utsname.h>
#include <linux/sunrpc/clnt.h>
#include <linux/nfs.h>
#define RPC_SLACK_SPACE 512 /* total overkill */
#ifdef RPC_DEBUG
# define RPCDBG_FACILITY RPCDBG_CALL
#endif
static DECLARE_WAIT_QUEUE_HEAD(destroy_wait);
static void call_reserve(struct rpc_task *task);
static void call_reserveresult(struct rpc_task *task);
static void call_allocate(struct rpc_task *task);
static void call_encode(struct rpc_task *task);
static void call_decode(struct rpc_task *task);
static void call_bind(struct rpc_task *task);
static void call_transmit(struct rpc_task *task);
static void call_status(struct rpc_task *task);
static void call_refresh(struct rpc_task *task);
static void call_refreshresult(struct rpc_task *task);
static void call_timeout(struct rpc_task *task);
static void call_reconnect(struct rpc_task *task);
static void child_reconnect(struct rpc_task *);
static void child_reconnect_status(struct rpc_task *);
static u32 * call_header(struct rpc_task *task);
static u32 * call_verify(struct rpc_task *task);
/*
* Create an RPC client
* FIXME: This should also take a flags argument (as in task->tk_flags).
* It's called (among others) from pmap_create_client, which may in
* turn be called by an async task. In this case, rpciod should not be
* made to sleep too long.
*/
struct rpc_clnt *
rpc_create_client(struct rpc_xprt *xprt, char *servname,
struct rpc_program *program, u32 vers, int flavor)
{
struct rpc_version *version;
struct rpc_clnt *clnt = NULL;
dprintk("RPC: creating %s client for %s (xprt %p)\n",
program->name, servname, xprt);
#ifdef RPC_DEBUG
rpc_register_sysctl();
#endif
if (!xprt)
goto out;
if (vers >= program->nrvers || !(version = program->version[vers]))
goto out;
clnt = (struct rpc_clnt *) rpc_allocate(0, sizeof(*clnt));
if (!clnt)
goto out_no_clnt;
memset(clnt, 0, sizeof(*clnt));
atomic_set(&clnt->cl_users, 0);
clnt->cl_xprt = xprt;
clnt->cl_procinfo = version->procs;
clnt->cl_maxproc = version->nrprocs;
clnt->cl_server = servname;
clnt->cl_protname = program->name;
clnt->cl_port = xprt->addr.sin_port;
clnt->cl_prog = program->number;
clnt->cl_vers = version->number;
clnt->cl_prot = xprt->prot;
clnt->cl_stats = program->stats;
clnt->cl_bindwait = RPC_INIT_WAITQ("bindwait");
if (!clnt->cl_port)
clnt->cl_autobind = 1;
if (!rpcauth_create(flavor, clnt))
goto out_no_auth;
/* save the nodename */
clnt->cl_nodelen = strlen(system_utsname.nodename);
if (clnt->cl_nodelen > UNX_MAXNODENAME)
clnt->cl_nodelen = UNX_MAXNODENAME;
memcpy(clnt->cl_nodename, system_utsname.nodename, clnt->cl_nodelen);
out:
return clnt;
out_no_clnt:
printk(KERN_INFO "RPC: out of memory in rpc_create_client\n");
goto out;
out_no_auth:
printk(KERN_INFO "RPC: Couldn't create auth handle (flavor %d)\n",
flavor);
rpc_free(clnt);
clnt = NULL;
goto out;
}
/*
* Properly shut down an RPC client, terminating all outstanding
* requests. Note that we must be certain that cl_oneshot and
* cl_dead are cleared, or else the client would be destroyed
* when the last task releases it.
*/
int
rpc_shutdown_client(struct rpc_clnt *clnt)
{
dprintk("RPC: shutting down %s client for %s\n",
clnt->cl_protname, clnt->cl_server);
while (atomic_read(&clnt->cl_users)) {
#ifdef RPC_DEBUG
dprintk("RPC: rpc_shutdown_client: client %s, tasks=%d\n",
clnt->cl_protname, atomic_read(&clnt->cl_users));
#endif
/* Don't let rpc_release_client destroy us */
clnt->cl_oneshot = 0;
clnt->cl_dead = 0;
rpc_killall_tasks(clnt);
sleep_on_timeout(&destroy_wait, 1*HZ);
}
return rpc_destroy_client(clnt);
}
/*
* Delete an RPC client
*/
int
rpc_destroy_client(struct rpc_clnt *clnt)
{
dprintk("RPC: destroying %s client for %s\n",
clnt->cl_protname, clnt->cl_server);
if (clnt->cl_auth) {
rpcauth_destroy(clnt->cl_auth);
clnt->cl_auth = NULL;
}
if (clnt->cl_xprt) {
xprt_destroy(clnt->cl_xprt);
clnt->cl_xprt = NULL;
}
rpc_free(clnt);
return 0;
}
/*
* Release an RPC client
*/
void
rpc_release_client(struct rpc_clnt *clnt)
{
dprintk("RPC: rpc_release_client(%p, %d)\n",
clnt, atomic_read(&clnt->cl_users));
if (!atomic_dec_and_test(&clnt->cl_users))
return;
wake_up(&destroy_wait);
if (clnt->cl_oneshot || clnt->cl_dead)
rpc_destroy_client(clnt);
}
/*
* Default callback for async RPC calls
*/
static void
rpc_default_callback(struct rpc_task *task)
{
}
/*
* Export the signal mask handling for aysnchronous code that
* sleeps on RPC calls
*/
void rpc_clnt_sigmask(struct rpc_clnt *clnt, sigset_t *oldset)
{
unsigned long sigallow = sigmask(SIGKILL);
unsigned long irqflags;
/* Turn off various signals */
if (clnt->cl_intr) {
struct k_sigaction *action = current->sig->action;
if (action[SIGINT-1].sa.sa_handler == SIG_DFL)
sigallow |= sigmask(SIGINT);
if (action[SIGQUIT-1].sa.sa_handler == SIG_DFL)
sigallow |= sigmask(SIGQUIT);
}
spin_lock_irqsave(¤t->sigmask_lock, irqflags);
*oldset = current->blocked;
siginitsetinv(¤t->blocked, sigallow & ~oldset->sig[0]);
recalc_sigpending(current);
spin_unlock_irqrestore(¤t->sigmask_lock, irqflags);
}
void rpc_clnt_sigunmask(struct rpc_clnt *clnt, sigset_t *oldset)
{
unsigned long irqflags;
spin_lock_irqsave(¤t->sigmask_lock, irqflags);
current->blocked = *oldset;
recalc_sigpending(current);
spin_unlock_irqrestore(¤t->sigmask_lock, irqflags);
}
/*
* New rpc_call implementation
*/
int rpc_call_sync(struct rpc_clnt *clnt, struct rpc_message *msg, int flags)
{
struct rpc_task my_task, *task = &my_task;
sigset_t oldset;
int status;
/* If this client is slain all further I/O fails */
if (clnt->cl_dead)
return -EIO;
if (flags & RPC_TASK_ASYNC) {
printk("rpc_call_sync: Illegal flag combination for synchronous task\n");
flags &= ~RPC_TASK_ASYNC;
}
rpc_clnt_sigmask(clnt, &oldset);
/* Create/initialize a new RPC task */
rpc_init_task(task, clnt, NULL, flags);
rpc_call_setup(task, msg, 0);
/* Set up the call info struct and execute the task */
if (task->tk_status == 0)
status = rpc_execute(task);
else {
status = task->tk_status;
rpc_release_task(task);
}
rpc_clnt_sigunmask(clnt, &oldset);
return status;
}
/*
* New rpc_call implementation
*/
int
rpc_call_async(struct rpc_clnt *clnt, struct rpc_message *msg, int flags,
rpc_action callback, void *data)
{
struct rpc_task *task;
sigset_t oldset;
int status;
/* If this client is slain all further I/O fails */
if (clnt->cl_dead)
return -EIO;
flags |= RPC_TASK_ASYNC;
rpc_clnt_sigmask(clnt, &oldset);
/* Create/initialize a new RPC task */
if (!callback)
callback = rpc_default_callback;
status = -ENOMEM;
if (!(task = rpc_new_task(clnt, callback, flags)))
goto out;
task->tk_calldata = data;
rpc_call_setup(task, msg, 0);
/* Set up the call info struct and execute the task */
if (task->tk_status == 0)
status = rpc_execute(task);
else {
status = task->tk_status;
rpc_release_task(task);
}
out:
rpc_clnt_sigunmask(clnt, &oldset);
return status;
}
void
rpc_call_setup(struct rpc_task *task, struct rpc_message *msg, int flags)
{
task->tk_msg = *msg;
task->tk_flags |= flags;
/* Bind the user cred */
if (task->tk_msg.rpc_cred != NULL) {
rpcauth_holdcred(task);
} else
rpcauth_bindcred(task);
if (task->tk_status == 0)
task->tk_action = call_reserve;
else
task->tk_action = NULL;
/* Increment call count */
if (task->tk_msg.rpc_proc < task->tk_client->cl_maxproc)
rpcproc_count(task->tk_client, task->tk_msg.rpc_proc)++;
}
/*
* Restart an (async) RPC call. Usually called from within the
* exit handler.
*/
void
rpc_restart_call(struct rpc_task *task)
{
if (RPC_ASSASSINATED(task))
return;
task->tk_action = call_reserve;
rpcproc_count(task->tk_client, task->tk_msg.rpc_proc)++;
}
/*
* 1. Reserve an RPC call slot
*/
static void
call_reserve(struct rpc_task *task)
{
struct rpc_clnt *clnt = task->tk_client;
if (task->tk_msg.rpc_proc > clnt->cl_maxproc) {
printk(KERN_WARNING "%s (vers %d): bad procedure number %d\n",
clnt->cl_protname, clnt->cl_vers, task->tk_msg.rpc_proc);
rpc_exit(task, -EIO);
return;
}
dprintk("RPC: %4d call_reserve\n", task->tk_pid);
if (!rpcauth_uptodatecred(task)) {
task->tk_action = call_refresh;
return;
}
task->tk_status = 0;
task->tk_action = call_reserveresult;
task->tk_timeout = clnt->cl_timeout.to_resrvval;
clnt->cl_stats->rpccnt++;
xprt_reserve(task);
}
/*
* 1b. Grok the result of xprt_reserve()
*/
static void
call_reserveresult(struct rpc_task *task)
{
int status = task->tk_status;
dprintk("RPC: %4d call_reserveresult (status %d)\n",
task->tk_pid, task->tk_status);
/*
* After a call to xprt_reserve(), we must have either
* a request slot or else an error status.
*/
if ((task->tk_status >= 0 && !task->tk_rqstp) ||
(task->tk_status < 0 && task->tk_rqstp))
printk(KERN_ERR "call_reserveresult: status=%d, request=%p??\n",
task->tk_status, task->tk_rqstp);
if (task->tk_status >= 0) {
task->tk_action = call_allocate;
return;
}
task->tk_status = 0;
switch (status) {
case -EAGAIN:
case -ENOBUFS:
task->tk_timeout = task->tk_client->cl_timeout.to_resrvval;
task->tk_action = call_reserve;
break;
case -ETIMEDOUT:
dprintk("RPC: task timed out\n");
task->tk_action = call_timeout;
break;
default:
if (!task->tk_rqstp) {
printk(KERN_INFO "RPC: task has no request, exit EIO\n");
rpc_exit(task, -EIO);
} else
rpc_exit(task, status);
}
}
/*
* 2. Allocate the buffer. For details, see sched.c:rpc_malloc.
* (Note: buffer memory is freed in rpc_task_release).
*/
static void
call_allocate(struct rpc_task *task)
{
struct rpc_clnt *clnt = task->tk_client;
unsigned int bufsiz;
dprintk("RPC: %4d call_allocate (status %d)\n",
task->tk_pid, task->tk_status);
task->tk_action = call_encode;
if (task->tk_buffer)
return;
/* FIXME: compute buffer requirements more exactly using
* auth->au_wslack */
bufsiz = rpcproc_bufsiz(clnt, task->tk_msg.rpc_proc) + RPC_SLACK_SPACE;
if ((task->tk_buffer = rpc_malloc(task, bufsiz << 1)) != NULL)
return;
printk(KERN_INFO "RPC: buffer allocation failed for task %p\n", task);
if (RPC_IS_ASYNC(task) || !(task->tk_client->cl_intr && signalled())) {
xprt_release(task);
task->tk_action = call_reserve;
rpc_delay(task, HZ>>4);
return;
}
rpc_exit(task, -ERESTARTSYS);
}
/*
* 3. Encode arguments of an RPC call
*/
static void
call_encode(struct rpc_task *task)
{
struct rpc_clnt *clnt = task->tk_client;
struct rpc_rqst *req = task->tk_rqstp;
unsigned int bufsiz;
kxdrproc_t encode;
int status;
u32 *p;
dprintk("RPC: %4d call_encode (status %d)\n",
task->tk_pid, task->tk_status);
task->tk_action = call_bind;
/* Default buffer setup */
bufsiz = rpcproc_bufsiz(clnt, task->tk_msg.rpc_proc)+RPC_SLACK_SPACE;
req->rq_svec[0].iov_base = (void *)task->tk_buffer;
req->rq_svec[0].iov_len = bufsiz;
req->rq_slen = 0;
req->rq_snr = 1;
req->rq_rvec[0].iov_base = (void *)((char *)task->tk_buffer + bufsiz);
req->rq_rvec[0].iov_len = bufsiz;
req->rq_rlen = bufsiz;
req->rq_rnr = 1;
/* Zero buffer so we have automatic zero-padding of opaque & string */
memset(task->tk_buffer, 0, bufsiz);
/* Encode header and provided arguments */
encode = rpcproc_encode(clnt, task->tk_msg.rpc_proc);
if (!(p = call_header(task))) {
printk(KERN_INFO "RPC: call_header failed, exit EIO\n");
rpc_exit(task, -EIO);
} else
if (encode && (status = encode(req, p, task->tk_msg.rpc_argp)) < 0) {
printk(KERN_WARNING "%s: can't encode arguments: %d\n",
clnt->cl_protname, -status);
rpc_exit(task, status);
}
}
/*
* 4. Get the server port number if not yet set
*/
static void
call_bind(struct rpc_task *task)
{
struct rpc_clnt *clnt = task->tk_client;
struct rpc_xprt *xprt = clnt->cl_xprt;
task->tk_action = (xprt_connected(xprt)) ? call_transmit : call_reconnect;
if (!clnt->cl_port) {
task->tk_action = call_reconnect;
task->tk_timeout = clnt->cl_timeout.to_maxval;
rpc_getport(task, clnt);
}
}
/*
* 4a. Reconnect to the RPC server (TCP case)
*/
static void
call_reconnect(struct rpc_task *task)
{
struct rpc_clnt *clnt = task->tk_client;
struct rpc_task *child;
dprintk("RPC: %4d call_reconnect status %d\n",
task->tk_pid, task->tk_status);
task->tk_action = call_transmit;
if (task->tk_status < 0 || !clnt->cl_xprt->stream)
return;
/* Run as a child to ensure it runs as an rpciod task */
child = rpc_new_child(clnt, task);
if (child) {
child->tk_action = child_reconnect;
rpc_run_child(task, child, NULL);
}
}
static void child_reconnect(struct rpc_task *task)
{
task->tk_client->cl_stats->netreconn++;
task->tk_status = 0;
task->tk_action = child_reconnect_status;
xprt_reconnect(task);
}
static void child_reconnect_status(struct rpc_task *task)
{
if (task->tk_status == -EAGAIN)
task->tk_action = child_reconnect;
else
task->tk_action = NULL;
}
/*
* 5. Transmit the RPC request, and wait for reply
*/
static void
call_transmit(struct rpc_task *task)
{
struct rpc_clnt *clnt = task->tk_client;
dprintk("RPC: %4d call_transmit (status %d)\n",
task->tk_pid, task->tk_status);
task->tk_action = call_status;
if (task->tk_status < 0)
return;
xprt_transmit(task);
if (!rpcproc_decode(clnt, task->tk_msg.rpc_proc)) {
task->tk_action = NULL;
rpc_wake_up_task(task);
}
}
/*
* 6. Sort out the RPC call status
*/
static void
call_status(struct rpc_task *task)
{
struct rpc_clnt *clnt = task->tk_client;
struct rpc_xprt *xprt = clnt->cl_xprt;
struct rpc_rqst *req;
int status = task->tk_status;
dprintk("RPC: %4d call_status (status %d)\n",
task->tk_pid, task->tk_status);
if (status >= 0) {
task->tk_action = call_decode;
return;
}
task->tk_status = 0;
req = task->tk_rqstp;
switch(status) {
case -ETIMEDOUT:
task->tk_action = call_timeout;
break;
case -ECONNREFUSED:
case -ENOTCONN:
req->rq_bytes_sent = 0;
if (clnt->cl_autobind || !clnt->cl_port) {
clnt->cl_port = 0;
task->tk_action = call_bind;
break;
}
if (xprt->stream) {
task->tk_action = call_reconnect;
break;
}
/*
* Sleep and dream of an open connection
*/
task->tk_timeout = 5 * HZ;
rpc_sleep_on(&xprt->sending, task, NULL, NULL);
case -ENOMEM:
case -EAGAIN:
task->tk_action = call_transmit;
clnt->cl_stats->rpcretrans++;
break;
default:
if (clnt->cl_chatty)
printk("%s: RPC call returned error %d\n",
clnt->cl_protname, -status);
rpc_exit(task, status);
}
}
/*
* 6a. Handle RPC timeout
* We do not release the request slot, so we keep using the
* same XID for all retransmits.
*/
static void
call_timeout(struct rpc_task *task)
{
struct rpc_clnt *clnt = task->tk_client;
struct rpc_rqst *req = task->tk_rqstp;
if (req) {
struct rpc_timeout *to = &req->rq_timeout;
if (xprt_adjust_timeout(to)) {
dprintk("RPC: %4d call_timeout (minor timeo)\n",
task->tk_pid);
goto minor_timeout;
}
to->to_retries = clnt->cl_timeout.to_retries;
}
dprintk("RPC: %4d call_timeout (major timeo)\n", task->tk_pid);
if (clnt->cl_softrtry) {
if (clnt->cl_chatty && !task->tk_exit)
printk(KERN_NOTICE "%s: server %s not responding, timed out\n",
clnt->cl_protname, clnt->cl_server);
rpc_exit(task, -EIO);
return;
}
if (clnt->cl_chatty && !(task->tk_flags & RPC_CALL_MAJORSEEN)) {
task->tk_flags |= RPC_CALL_MAJORSEEN;
if (req)
printk(KERN_NOTICE "%s: server %s not responding, still trying\n",
clnt->cl_protname, clnt->cl_server);
#ifdef RPC_DEBUG
else
printk(KERN_NOTICE "%s: task %d can't get a request slot\n",
clnt->cl_protname, task->tk_pid);
#endif
}
if (clnt->cl_autobind)
clnt->cl_port = 0;
minor_timeout:
if (!req)
task->tk_action = call_reserve;
else if (!clnt->cl_port) {
task->tk_action = call_bind;
clnt->cl_stats->rpcretrans++;
} else if (!xprt_connected(clnt->cl_xprt)) {
task->tk_action = call_reconnect;
clnt->cl_stats->rpcretrans++;
} else {
task->tk_action = call_transmit;
clnt->cl_stats->rpcretrans++;
}
task->tk_status = 0;
}
/*
* 7. Decode the RPC reply
*/
static void
call_decode(struct rpc_task *task)
{
struct rpc_clnt *clnt = task->tk_client;
struct rpc_rqst *req = task->tk_rqstp;
kxdrproc_t decode = rpcproc_decode(clnt, task->tk_msg.rpc_proc);
u32 *p;
dprintk("RPC: %4d call_decode (status %d)\n",
task->tk_pid, task->tk_status);
if (clnt->cl_chatty && (task->tk_flags & RPC_CALL_MAJORSEEN)) {
printk(KERN_NOTICE "%s: server %s OK\n",
clnt->cl_protname, clnt->cl_server);
task->tk_flags &= ~RPC_CALL_MAJORSEEN;
}
if (task->tk_status < 12) {
if (!clnt->cl_softrtry) {
task->tk_action = call_transmit;
clnt->cl_stats->rpcretrans++;
} else {
printk(KERN_WARNING "%s: too small RPC reply size (%d bytes)\n",
clnt->cl_protname, task->tk_status);
rpc_exit(task, -EIO);
}
return;
}
/* Verify the RPC header */
if (!(p = call_verify(task)))
return;
/*
* The following is an NFS-specific hack to cater for setuid
* processes whose uid is mapped to nobody on the server.
*/
if (task->tk_client->cl_droppriv &&
(ntohl(*p) == NFSERR_ACCES || ntohl(*p) == NFSERR_PERM)) {
if (RPC_IS_SETUID(task) && task->tk_suid_retry) {
dprintk("RPC: %4d retry squashed uid\n", task->tk_pid);
task->tk_flags ^= RPC_CALL_REALUID;
task->tk_action = call_encode;
task->tk_suid_retry--;
return;
}
}
task->tk_action = NULL;
if (decode)
task->tk_status = decode(req, p, task->tk_msg.rpc_resp);
dprintk("RPC: %4d call_decode result %d\n", task->tk_pid,
task->tk_status);
}
/*
* 8. Refresh the credentials if rejected by the server
*/
static void
call_refresh(struct rpc_task *task)
{
dprintk("RPC: %4d call_refresh\n", task->tk_pid);
xprt_release(task); /* Must do to obtain new XID */
task->tk_action = call_refreshresult;
task->tk_status = 0;
task->tk_client->cl_stats->rpcauthrefresh++;
rpcauth_refreshcred(task);
}
/*
* 8a. Process the results of a credential refresh
*/
static void
call_refreshresult(struct rpc_task *task)
{
dprintk("RPC: %4d call_refreshresult (status %d)\n",
task->tk_pid, task->tk_status);
if (task->tk_status < 0)
rpc_exit(task, -EACCES);
else
task->tk_action = call_reserve;
}
/*
* Call header serialization
*/
static u32 *
call_header(struct rpc_task *task)
{
struct rpc_clnt *clnt = task->tk_client;
struct rpc_xprt *xprt = clnt->cl_xprt;
struct rpc_rqst *req = task->tk_rqstp;
u32 *p = req->rq_svec[0].iov_base;
/* FIXME: check buffer size? */
if (xprt->stream)
*p++ = 0; /* fill in later */
*p++ = req->rq_xid; /* XID */
*p++ = htonl(RPC_CALL); /* CALL */
*p++ = htonl(RPC_VERSION); /* RPC version */
*p++ = htonl(clnt->cl_prog); /* program number */
*p++ = htonl(clnt->cl_vers); /* program version */
*p++ = htonl(task->tk_msg.rpc_proc); /* procedure */
return rpcauth_marshcred(task, p);
}
/*
* Reply header verification
*/
static u32 *
call_verify(struct rpc_task *task)
{
u32 *p = task->tk_rqstp->rq_rvec[0].iov_base, n;
p += 1; /* skip XID */
if ((n = ntohl(*p++)) != RPC_REPLY) {
printk(KERN_WARNING "call_verify: not an RPC reply: %x\n", n);
goto garbage;
}
if ((n = ntohl(*p++)) != RPC_MSG_ACCEPTED) {
int error = -EACCES;
if ((n = ntohl(*p++)) != RPC_AUTH_ERROR) {
printk(KERN_WARNING "call_verify: RPC call rejected: %x\n", n);
} else
switch ((n = ntohl(*p++))) {
case RPC_AUTH_REJECTEDCRED:
case RPC_AUTH_REJECTEDVERF:
if (!task->tk_cred_retry)
break;
task->tk_cred_retry--;
dprintk("RPC: %4d call_verify: retry stale creds\n",
task->tk_pid);
rpcauth_invalcred(task);
task->tk_action = call_refresh;
return NULL;
case RPC_AUTH_BADCRED:
case RPC_AUTH_BADVERF:
/* possibly garbled cred/verf? */
if (!task->tk_garb_retry)
break;
task->tk_garb_retry--;
dprintk("RPC: %4d call_verify: retry garbled creds\n",
task->tk_pid);
task->tk_action = call_encode;
return NULL;
case RPC_AUTH_TOOWEAK:
printk(KERN_NOTICE "call_verify: server requires stronger "
"authentication.\n");
break;
default:
printk(KERN_WARNING "call_verify: unknown auth error: %x\n", n);
error = -EIO;
}
dprintk("RPC: %4d call_verify: call rejected %d\n",
task->tk_pid, n);
rpc_exit(task, error);
return NULL;
}
if (!(p = rpcauth_checkverf(task, p))) {
printk(KERN_WARNING "call_verify: auth check failed\n");
goto garbage; /* bad verifier, retry */
}
switch ((n = ntohl(*p++))) {
case RPC_SUCCESS:
return p;
case RPC_GARBAGE_ARGS:
break; /* retry */
default:
printk(KERN_WARNING "call_verify: server accept status: %x\n", n);
/* Also retry */
}
garbage:
dprintk("RPC: %4d call_verify: server saw garbage\n", task->tk_pid);
task->tk_client->cl_stats->rpcgarbage++;
if (task->tk_garb_retry) {
task->tk_garb_retry--;
dprintk(KERN_WARNING "RPC: garbage, retrying %4d\n", task->tk_pid);
task->tk_action = call_encode;
return NULL;
}
printk(KERN_WARNING "RPC: garbage, exit EIO\n");
rpc_exit(task, -EIO);
return NULL;
}
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