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/*
* linux/fs/lockd/svc4proc.c
*
* Lockd server procedures. We don't implement the NLM_*_RES
* procedures because we don't use the async procedures.
*
* Copyright (C) 1996, Olaf Kirch <okir@monad.swb.de>
*/
#include <linux/types.h>
#include <linux/sched.h>
#include <linux/slab.h>
#include <linux/in.h>
#include <linux/sunrpc/svc.h>
#include <linux/sunrpc/clnt.h>
#include <linux/nfsd/nfsd.h>
#include <linux/lockd/lockd.h>
#include <linux/lockd/share.h>
#include <linux/lockd/sm_inter.h>
#define NLMDBG_FACILITY NLMDBG_CLIENT
static u32 nlm4svc_callback(struct svc_rqst *, u32, struct nlm_res *);
static void nlm4svc_callback_exit(struct rpc_task *);
/*
* Obtain client and file from arguments
*/
static u32
nlm4svc_retrieve_args(struct svc_rqst *rqstp, struct nlm_args *argp,
struct nlm_host **hostp, struct nlm_file **filp)
{
struct nlm_host *host = NULL;
struct nlm_file *file = NULL;
struct nlm_lock *lock = &argp->lock;
u32 error = 0;
/* nfsd callbacks must have been installed for this procedure */
if (!nlmsvc_ops)
return nlm_lck_denied_nolocks;
/* Obtain handle for client host */
if (rqstp->rq_client == NULL) {
printk(KERN_NOTICE
"lockd: unauthenticated request from (%08x:%d)\n",
ntohl(rqstp->rq_addr.sin_addr.s_addr),
ntohs(rqstp->rq_addr.sin_port));
return nlm_lck_denied_nolocks;
}
/* Obtain host handle */
if (!(host = nlmsvc_lookup_host(rqstp))
|| (argp->monitor && !host->h_monitored && nsm_monitor(host) < 0))
goto no_locks;
*hostp = host;
/* Obtain file pointer. Not used by FREE_ALL call. */
if (filp != NULL) {
if ((error = nlm_lookup_file(rqstp, &file, &lock->fh)) != 0)
goto no_locks;
*filp = file;
/* Set up the missing parts of the file_lock structure */
lock->fl.fl_file = &file->f_file;
lock->fl.fl_owner = (fl_owner_t) host;
}
return 0;
no_locks:
if (host)
nlm_release_host(host);
if (error)
return error;
return nlm_lck_denied_nolocks;
}
/*
* NULL: Test for presence of service
*/
static int
nlm4svc_proc_null(struct svc_rqst *rqstp, void *argp, void *resp)
{
dprintk("lockd: NULL called\n");
return rpc_success;
}
/*
* TEST: Check for conflicting lock
*/
static int
nlm4svc_proc_test(struct svc_rqst *rqstp, struct nlm_args *argp,
struct nlm_res *resp)
{
struct nlm_host *host;
struct nlm_file *file;
dprintk("lockd: TEST4 called\n");
resp->cookie = argp->cookie;
/* Don't accept test requests during grace period */
if (nlmsvc_grace_period) {
resp->status = nlm_lck_denied_grace_period;
return rpc_success;
}
/* Obtain client and file */
if ((resp->status = nlm4svc_retrieve_args(rqstp, argp, &host, &file)))
return rpc_success;
/* Now check for conflicting locks */
resp->status = nlmsvc_testlock(file, &argp->lock, &resp->lock);
dprintk("lockd: TEST4 status %d\n", ntohl(resp->status));
nlm_release_host(host);
nlm_release_file(file);
return rpc_success;
}
static int
nlm4svc_proc_lock(struct svc_rqst *rqstp, struct nlm_args *argp,
struct nlm_res *resp)
{
struct nlm_host *host;
struct nlm_file *file;
dprintk("lockd: LOCK called\n");
resp->cookie = argp->cookie;
/* Don't accept new lock requests during grace period */
if (nlmsvc_grace_period && !argp->reclaim) {
resp->status = nlm_lck_denied_grace_period;
return rpc_success;
}
/* Obtain client and file */
if ((resp->status = nlm4svc_retrieve_args(rqstp, argp, &host, &file)))
return rpc_success;
#if 0
/* If supplied state doesn't match current state, we assume it's
* an old request that time-warped somehow. Any error return would
* do in this case because it's irrelevant anyway.
*
* NB: We don't retrieve the remote host's state yet.
*/
if (host->h_nsmstate && host->h_nsmstate != argp->state) {
resp->status = nlm_lck_denied_nolocks;
} else
#endif
/* Now try to lock the file */
resp->status = nlmsvc_lock(rqstp, file, &argp->lock,
argp->block, &argp->cookie);
dprintk("lockd: LOCK status %d\n", ntohl(resp->status));
nlm_release_host(host);
nlm_release_file(file);
return rpc_success;
}
static int
nlm4svc_proc_cancel(struct svc_rqst *rqstp, struct nlm_args *argp,
struct nlm_res *resp)
{
struct nlm_host *host;
struct nlm_file *file;
dprintk("lockd: CANCEL called\n");
resp->cookie = argp->cookie;
/* Don't accept requests during grace period */
if (nlmsvc_grace_period) {
resp->status = nlm_lck_denied_grace_period;
return rpc_success;
}
/* Obtain client and file */
if ((resp->status = nlm4svc_retrieve_args(rqstp, argp, &host, &file)))
return rpc_success;
/* Try to cancel request. */
resp->status = nlmsvc_cancel_blocked(file, &argp->lock);
dprintk("lockd: CANCEL status %d\n", ntohl(resp->status));
nlm_release_host(host);
nlm_release_file(file);
return rpc_success;
}
/*
* UNLOCK: release a lock
*/
static int
nlm4svc_proc_unlock(struct svc_rqst *rqstp, struct nlm_args *argp,
struct nlm_res *resp)
{
struct nlm_host *host;
struct nlm_file *file;
dprintk("lockd: UNLOCK called\n");
resp->cookie = argp->cookie;
/* Don't accept new lock requests during grace period */
if (nlmsvc_grace_period) {
resp->status = nlm_lck_denied_grace_period;
return rpc_success;
}
/* Obtain client and file */
if ((resp->status = nlm4svc_retrieve_args(rqstp, argp, &host, &file)))
return rpc_success;
/* Now try to remove the lock */
resp->status = nlmsvc_unlock(file, &argp->lock);
dprintk("lockd: UNLOCK status %d\n", ntohl(resp->status));
nlm_release_host(host);
nlm_release_file(file);
return rpc_success;
}
/*
* GRANTED: A server calls us to tell that a process' lock request
* was granted
*/
static int
nlm4svc_proc_granted(struct svc_rqst *rqstp, struct nlm_args *argp,
struct nlm_res *resp)
{
resp->cookie = argp->cookie;
dprintk("lockd: GRANTED called\n");
resp->status = nlmclnt_grant(&argp->lock);
dprintk("lockd: GRANTED status %d\n", ntohl(resp->status));
return rpc_success;
}
/*
* `Async' versions of the above service routines. They aren't really,
* because we send the callback before the reply proper. I hope this
* doesn't break any clients.
*/
static int
nlm4svc_proc_test_msg(struct svc_rqst *rqstp, struct nlm_args *argp,
void *resp)
{
struct nlm_res res;
u32 stat;
dprintk("lockd: TEST_MSG called\n");
if ((stat = nlm4svc_proc_test(rqstp, argp, &res)) == 0)
stat = nlm4svc_callback(rqstp, NLMPROC_TEST_RES, &res);
return stat;
}
static int
nlm4svc_proc_lock_msg(struct svc_rqst *rqstp, struct nlm_args *argp,
void *resp)
{
struct nlm_res res;
u32 stat;
dprintk("lockd: LOCK_MSG called\n");
if ((stat = nlm4svc_proc_lock(rqstp, argp, &res)) == 0)
stat = nlm4svc_callback(rqstp, NLMPROC_LOCK_RES, &res);
return stat;
}
static int
nlm4svc_proc_cancel_msg(struct svc_rqst *rqstp, struct nlm_args *argp,
void *resp)
{
struct nlm_res res;
u32 stat;
dprintk("lockd: CANCEL_MSG called\n");
if ((stat = nlm4svc_proc_cancel(rqstp, argp, &res)) == 0)
stat = nlm4svc_callback(rqstp, NLMPROC_CANCEL_RES, &res);
return stat;
}
static int
nlm4svc_proc_unlock_msg(struct svc_rqst *rqstp, struct nlm_args *argp,
void *resp)
{
struct nlm_res res;
u32 stat;
dprintk("lockd: UNLOCK_MSG called\n");
if ((stat = nlm4svc_proc_unlock(rqstp, argp, &res)) == 0)
stat = nlm4svc_callback(rqstp, NLMPROC_UNLOCK_RES, &res);
return stat;
}
static int
nlm4svc_proc_granted_msg(struct svc_rqst *rqstp, struct nlm_args *argp,
void *resp)
{
struct nlm_res res;
u32 stat;
dprintk("lockd: GRANTED_MSG called\n");
if ((stat = nlm4svc_proc_granted(rqstp, argp, &res)) == 0)
stat = nlm4svc_callback(rqstp, NLMPROC_GRANTED_RES, &res);
return stat;
}
/*
* SHARE: create a DOS share or alter existing share.
*/
static int
nlm4svc_proc_share(struct svc_rqst *rqstp, struct nlm_args *argp,
struct nlm_res *resp)
{
struct nlm_host *host;
struct nlm_file *file;
dprintk("lockd: SHARE called\n");
resp->cookie = argp->cookie;
/* Don't accept new lock requests during grace period */
if (nlmsvc_grace_period && !argp->reclaim) {
resp->status = nlm_lck_denied_grace_period;
return rpc_success;
}
/* Obtain client and file */
if ((resp->status = nlm4svc_retrieve_args(rqstp, argp, &host, &file)))
return rpc_success;
/* Now try to create the share */
resp->status = nlmsvc_share_file(host, file, argp);
dprintk("lockd: SHARE status %d\n", ntohl(resp->status));
nlm_release_host(host);
nlm_release_file(file);
return rpc_success;
}
/*
* UNSHARE: Release a DOS share.
*/
static int
nlm4svc_proc_unshare(struct svc_rqst *rqstp, struct nlm_args *argp,
struct nlm_res *resp)
{
struct nlm_host *host;
struct nlm_file *file;
dprintk("lockd: UNSHARE called\n");
resp->cookie = argp->cookie;
/* Don't accept requests during grace period */
if (nlmsvc_grace_period) {
resp->status = nlm_lck_denied_grace_period;
return rpc_success;
}
/* Obtain client and file */
if ((resp->status = nlm4svc_retrieve_args(rqstp, argp, &host, &file)))
return rpc_success;
/* Now try to lock the file */
resp->status = nlmsvc_unshare_file(host, file, argp);
dprintk("lockd: UNSHARE status %d\n", ntohl(resp->status));
nlm_release_host(host);
nlm_release_file(file);
return rpc_success;
}
/*
* NM_LOCK: Create an unmonitored lock
*/
static int
nlm4svc_proc_nm_lock(struct svc_rqst *rqstp, struct nlm_args *argp,
struct nlm_res *resp)
{
dprintk("lockd: NM_LOCK called\n");
argp->monitor = 0; /* just clean the monitor flag */
return nlm4svc_proc_lock(rqstp, argp, resp);
}
/*
* FREE_ALL: Release all locks and shares held by client
*/
static int
nlm4svc_proc_free_all(struct svc_rqst *rqstp, struct nlm_args *argp,
void *resp)
{
struct nlm_host *host;
/* Obtain client */
if (nlm4svc_retrieve_args(rqstp, argp, &host, NULL))
return rpc_success;
nlmsvc_free_host_resources(host);
nlm_release_host(host);
return rpc_success;
}
/*
* SM_NOTIFY: private callback from statd (not part of official NLM proto)
*/
static int
nlm4svc_proc_sm_notify(struct svc_rqst *rqstp, struct nlm_reboot *argp,
void *resp)
{
struct sockaddr_in saddr = rqstp->rq_addr;
int vers = rqstp->rq_vers;
int prot = rqstp->rq_prot;
struct nlm_host *host;
dprintk("lockd: SM_NOTIFY called\n");
if (saddr.sin_addr.s_addr != htonl(INADDR_LOOPBACK)
|| ntohs(saddr.sin_port) >= 1024) {
printk(KERN_WARNING
"lockd: rejected NSM callback from %08x:%d\n",
ntohl(rqstp->rq_addr.sin_addr.s_addr),
ntohs(rqstp->rq_addr.sin_port));
return rpc_system_err;
}
/* Obtain the host pointer for this NFS server and try to
* reclaim all locks we hold on this server.
*/
saddr.sin_addr.s_addr = argp->addr;
if ((host = nlmclnt_lookup_host(&saddr, prot, vers)) != NULL) {
nlmclnt_recovery(host, argp->state);
nlm_release_host(host);
}
/* If we run on an NFS server, delete all locks held by the client */
if (nlmsvc_ops != NULL) {
struct svc_client *clnt;
saddr.sin_addr.s_addr = argp->addr;
if ((clnt = nlmsvc_ops->exp_getclient(&saddr)) != NULL
&& (host = nlm_lookup_host(clnt, &saddr, 0, 0)) != NULL) {
nlmsvc_free_host_resources(host);
}
nlm_release_host(host);
}
return rpc_success;
}
/*
* This is the generic lockd callback for async RPC calls
*/
static u32
nlm4svc_callback(struct svc_rqst *rqstp, u32 proc, struct nlm_res *resp)
{
struct nlm_host *host;
struct nlm_rqst *call;
if (!(call = nlmclnt_alloc_call()))
return rpc_system_err;
host = nlmclnt_lookup_host(&rqstp->rq_addr,
rqstp->rq_prot, rqstp->rq_vers);
if (!host) {
kfree(call);
return rpc_system_err;
}
call->a_flags = RPC_TASK_ASYNC;
call->a_host = host;
memcpy(&call->a_args, resp, sizeof(*resp));
if (nlmsvc_async_call(call, proc, nlm4svc_callback_exit) < 0)
goto error;
return rpc_success;
error:
kfree(call);
nlm_release_host(host);
return rpc_system_err;
}
static void
nlm4svc_callback_exit(struct rpc_task *task)
{
struct nlm_rqst *call = (struct nlm_rqst *) task->tk_calldata;
if (task->tk_status < 0) {
dprintk("lockd: %4d callback failed (errno = %d)\n",
task->tk_pid, -task->tk_status);
}
nlm_release_host(call->a_host);
kfree(call);
}
/*
* NLM Server procedures.
*/
#define nlm4svc_encode_norep nlm4svc_encode_void
#define nlm4svc_decode_norep nlm4svc_decode_void
#define nlm4svc_decode_testres nlm4svc_decode_void
#define nlm4svc_decode_lockres nlm4svc_decode_void
#define nlm4svc_decode_unlockres nlm4svc_decode_void
#define nlm4svc_decode_cancelres nlm4svc_decode_void
#define nlm4svc_decode_grantedres nlm4svc_decode_void
#define nlm4svc_proc_none nlm4svc_proc_null
#define nlm4svc_proc_test_res nlm4svc_proc_null
#define nlm4svc_proc_lock_res nlm4svc_proc_null
#define nlm4svc_proc_cancel_res nlm4svc_proc_null
#define nlm4svc_proc_unlock_res nlm4svc_proc_null
#define nlm4svc_proc_granted_res nlm4svc_proc_null
struct nlm_void { int dummy; };
#define PROC(name, xargt, xrest, argt, rest) \
{ (svc_procfunc) nlm4svc_proc_##name, \
(kxdrproc_t) nlm4svc_decode_##xargt, \
(kxdrproc_t) nlm4svc_encode_##xrest, \
NULL, \
sizeof(struct nlm_##argt), \
sizeof(struct nlm_##rest), \
0, \
0 \
}
struct svc_procedure nlmsvc_procedures4[] = {
PROC(null, void, void, void, void),
PROC(test, testargs, testres, args, res),
PROC(lock, lockargs, res, args, res),
PROC(cancel, cancargs, res, args, res),
PROC(unlock, unlockargs, res, args, res),
PROC(granted, testargs, res, args, res),
PROC(test_msg, testargs, norep, args, void),
PROC(lock_msg, lockargs, norep, args, void),
PROC(cancel_msg, cancargs, norep, args, void),
PROC(unlock_msg, unlockargs, norep, args, void),
PROC(granted_msg, testargs, norep, args, void),
PROC(test_res, testres, norep, res, void),
PROC(lock_res, lockres, norep, res, void),
PROC(cancel_res, cancelres, norep, res, void),
PROC(unlock_res, unlockres, norep, res, void),
PROC(granted_res, grantedres, norep, res, void),
/* statd callback */
PROC(sm_notify, reboot, void, reboot, void),
PROC(none, void, void, void, void),
PROC(none, void, void, void, void),
PROC(none, void, void, void, void),
PROC(share, shareargs, shareres, args, res),
PROC(unshare, shareargs, shareres, args, res),
PROC(nm_lock, lockargs, res, args, res),
PROC(free_all, notify, void, args, void),
};
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