583 lines
15 KiB
C
583 lines
15 KiB
C
// SPDX-License-Identifier: GPL-2.0
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/*
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* linux/fs/lockd/svcproc.c
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*
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* Lockd server procedures. We don't implement the NLM_*_RES
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* procedures because we don't use the async procedures.
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*
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* Copyright (C) 1996, Olaf Kirch <okir@monad.swb.de>
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*/
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#include <linux/types.h>
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#include <linux/time.h>
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#include <linux/lockd/lockd.h>
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#include <linux/lockd/share.h>
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#include <linux/sunrpc/svc_xprt.h>
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#define NLMDBG_FACILITY NLMDBG_CLIENT
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#ifdef CONFIG_LOCKD_V4
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static __be32
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cast_to_nlm(__be32 status, u32 vers)
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{
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/* Note: status is assumed to be in network byte order !!! */
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if (vers != 4){
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switch (status) {
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case nlm_granted:
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case nlm_lck_denied:
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case nlm_lck_denied_nolocks:
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case nlm_lck_blocked:
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case nlm_lck_denied_grace_period:
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case nlm_drop_reply:
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break;
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case nlm4_deadlock:
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status = nlm_lck_denied;
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break;
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default:
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status = nlm_lck_denied_nolocks;
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}
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}
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return (status);
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}
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#define cast_status(status) (cast_to_nlm(status, rqstp->rq_vers))
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#else
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#define cast_status(status) (status)
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#endif
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/*
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* Obtain client and file from arguments
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*/
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static __be32
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nlmsvc_retrieve_args(struct svc_rqst *rqstp, struct nlm_args *argp,
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struct nlm_host **hostp, struct nlm_file **filp)
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{
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struct nlm_host *host = NULL;
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struct nlm_file *file = NULL;
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struct nlm_lock *lock = &argp->lock;
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__be32 error = 0;
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/* nfsd callbacks must have been installed for this procedure */
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if (!nlmsvc_ops)
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return nlm_lck_denied_nolocks;
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/* Obtain host handle */
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if (!(host = nlmsvc_lookup_host(rqstp, lock->caller, lock->len))
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|| (argp->monitor && nsm_monitor(host) < 0))
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goto no_locks;
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*hostp = host;
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/* Obtain file pointer. Not used by FREE_ALL call. */
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if (filp != NULL) {
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error = cast_status(nlm_lookup_file(rqstp, &file, &lock->fh));
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if (error != 0)
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goto no_locks;
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*filp = file;
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/* Set up the missing parts of the file_lock structure */
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lock->fl.fl_file = file->f_file;
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lock->fl.fl_owner = (fl_owner_t) host;
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lock->fl.fl_lmops = &nlmsvc_lock_operations;
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}
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return 0;
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no_locks:
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nlmsvc_release_host(host);
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if (error)
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return error;
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return nlm_lck_denied_nolocks;
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}
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/*
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* NULL: Test for presence of service
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*/
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static __be32
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nlmsvc_proc_null(struct svc_rqst *rqstp)
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{
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dprintk("lockd: NULL called\n");
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return rpc_success;
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}
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/*
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* TEST: Check for conflicting lock
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*/
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static __be32
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__nlmsvc_proc_test(struct svc_rqst *rqstp, struct nlm_res *resp)
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{
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struct nlm_args *argp = rqstp->rq_argp;
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struct nlm_host *host;
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struct nlm_file *file;
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__be32 rc = rpc_success;
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dprintk("lockd: TEST called\n");
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resp->cookie = argp->cookie;
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/* Obtain client and file */
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if ((resp->status = nlmsvc_retrieve_args(rqstp, argp, &host, &file)))
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return resp->status == nlm_drop_reply ? rpc_drop_reply :rpc_success;
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/* Now check for conflicting locks */
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resp->status = cast_status(nlmsvc_testlock(rqstp, file, host, &argp->lock, &resp->lock, &resp->cookie));
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if (resp->status == nlm_drop_reply)
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rc = rpc_drop_reply;
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else
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dprintk("lockd: TEST status %d vers %d\n",
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ntohl(resp->status), rqstp->rq_vers);
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nlmsvc_release_host(host);
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nlm_release_file(file);
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return rc;
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}
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static __be32
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nlmsvc_proc_test(struct svc_rqst *rqstp)
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{
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return __nlmsvc_proc_test(rqstp, rqstp->rq_resp);
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}
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static __be32
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__nlmsvc_proc_lock(struct svc_rqst *rqstp, struct nlm_res *resp)
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{
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struct nlm_args *argp = rqstp->rq_argp;
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struct nlm_host *host;
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struct nlm_file *file;
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__be32 rc = rpc_success;
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dprintk("lockd: LOCK called\n");
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resp->cookie = argp->cookie;
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/* Obtain client and file */
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if ((resp->status = nlmsvc_retrieve_args(rqstp, argp, &host, &file)))
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return resp->status == nlm_drop_reply ? rpc_drop_reply :rpc_success;
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#if 0
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/* If supplied state doesn't match current state, we assume it's
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* an old request that time-warped somehow. Any error return would
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* do in this case because it's irrelevant anyway.
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*
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* NB: We don't retrieve the remote host's state yet.
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*/
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if (host->h_nsmstate && host->h_nsmstate != argp->state) {
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resp->status = nlm_lck_denied_nolocks;
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} else
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#endif
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/* Now try to lock the file */
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resp->status = cast_status(nlmsvc_lock(rqstp, file, host, &argp->lock,
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argp->block, &argp->cookie,
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argp->reclaim));
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if (resp->status == nlm_drop_reply)
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rc = rpc_drop_reply;
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else
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dprintk("lockd: LOCK status %d\n", ntohl(resp->status));
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nlmsvc_release_host(host);
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nlm_release_file(file);
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return rc;
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}
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static __be32
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nlmsvc_proc_lock(struct svc_rqst *rqstp)
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{
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return __nlmsvc_proc_lock(rqstp, rqstp->rq_resp);
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}
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static __be32
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__nlmsvc_proc_cancel(struct svc_rqst *rqstp, struct nlm_res *resp)
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{
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struct nlm_args *argp = rqstp->rq_argp;
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struct nlm_host *host;
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struct nlm_file *file;
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struct net *net = SVC_NET(rqstp);
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dprintk("lockd: CANCEL called\n");
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resp->cookie = argp->cookie;
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/* Don't accept requests during grace period */
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if (locks_in_grace(net)) {
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resp->status = nlm_lck_denied_grace_period;
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return rpc_success;
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}
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/* Obtain client and file */
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if ((resp->status = nlmsvc_retrieve_args(rqstp, argp, &host, &file)))
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return resp->status == nlm_drop_reply ? rpc_drop_reply :rpc_success;
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/* Try to cancel request. */
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resp->status = cast_status(nlmsvc_cancel_blocked(net, file, &argp->lock));
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dprintk("lockd: CANCEL status %d\n", ntohl(resp->status));
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nlmsvc_release_host(host);
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nlm_release_file(file);
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return rpc_success;
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}
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static __be32
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nlmsvc_proc_cancel(struct svc_rqst *rqstp)
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{
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return __nlmsvc_proc_cancel(rqstp, rqstp->rq_resp);
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}
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/*
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* UNLOCK: release a lock
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*/
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static __be32
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__nlmsvc_proc_unlock(struct svc_rqst *rqstp, struct nlm_res *resp)
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{
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struct nlm_args *argp = rqstp->rq_argp;
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struct nlm_host *host;
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struct nlm_file *file;
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struct net *net = SVC_NET(rqstp);
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dprintk("lockd: UNLOCK called\n");
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resp->cookie = argp->cookie;
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/* Don't accept new lock requests during grace period */
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if (locks_in_grace(net)) {
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resp->status = nlm_lck_denied_grace_period;
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return rpc_success;
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}
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/* Obtain client and file */
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if ((resp->status = nlmsvc_retrieve_args(rqstp, argp, &host, &file)))
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return resp->status == nlm_drop_reply ? rpc_drop_reply :rpc_success;
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/* Now try to remove the lock */
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resp->status = cast_status(nlmsvc_unlock(net, file, &argp->lock));
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dprintk("lockd: UNLOCK status %d\n", ntohl(resp->status));
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nlmsvc_release_host(host);
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nlm_release_file(file);
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return rpc_success;
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}
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static __be32
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nlmsvc_proc_unlock(struct svc_rqst *rqstp)
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{
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return __nlmsvc_proc_unlock(rqstp, rqstp->rq_resp);
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}
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/*
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* GRANTED: A server calls us to tell that a process' lock request
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* was granted
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*/
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static __be32
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__nlmsvc_proc_granted(struct svc_rqst *rqstp, struct nlm_res *resp)
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{
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struct nlm_args *argp = rqstp->rq_argp;
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resp->cookie = argp->cookie;
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dprintk("lockd: GRANTED called\n");
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resp->status = nlmclnt_grant(svc_addr(rqstp), &argp->lock);
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dprintk("lockd: GRANTED status %d\n", ntohl(resp->status));
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return rpc_success;
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}
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static __be32
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nlmsvc_proc_granted(struct svc_rqst *rqstp)
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{
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return __nlmsvc_proc_granted(rqstp, rqstp->rq_resp);
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}
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/*
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* This is the generic lockd callback for async RPC calls
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*/
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static void nlmsvc_callback_exit(struct rpc_task *task, void *data)
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{
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dprintk("lockd: %5u callback returned %d\n", task->tk_pid,
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-task->tk_status);
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}
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void nlmsvc_release_call(struct nlm_rqst *call)
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{
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if (!refcount_dec_and_test(&call->a_count))
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return;
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nlmsvc_release_host(call->a_host);
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kfree(call);
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}
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static void nlmsvc_callback_release(void *data)
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{
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nlmsvc_release_call(data);
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}
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static const struct rpc_call_ops nlmsvc_callback_ops = {
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.rpc_call_done = nlmsvc_callback_exit,
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.rpc_release = nlmsvc_callback_release,
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};
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/*
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* `Async' versions of the above service routines. They aren't really,
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* because we send the callback before the reply proper. I hope this
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* doesn't break any clients.
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*/
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static __be32 nlmsvc_callback(struct svc_rqst *rqstp, u32 proc,
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__be32 (*func)(struct svc_rqst *, struct nlm_res *))
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{
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struct nlm_args *argp = rqstp->rq_argp;
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struct nlm_host *host;
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struct nlm_rqst *call;
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__be32 stat;
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host = nlmsvc_lookup_host(rqstp,
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argp->lock.caller,
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argp->lock.len);
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if (host == NULL)
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return rpc_system_err;
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call = nlm_alloc_call(host);
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nlmsvc_release_host(host);
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if (call == NULL)
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return rpc_system_err;
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stat = func(rqstp, &call->a_res);
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if (stat != 0) {
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nlmsvc_release_call(call);
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return stat;
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}
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call->a_flags = RPC_TASK_ASYNC;
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if (nlm_async_reply(call, proc, &nlmsvc_callback_ops) < 0)
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return rpc_system_err;
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return rpc_success;
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}
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static __be32 nlmsvc_proc_test_msg(struct svc_rqst *rqstp)
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{
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dprintk("lockd: TEST_MSG called\n");
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return nlmsvc_callback(rqstp, NLMPROC_TEST_RES, __nlmsvc_proc_test);
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}
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static __be32 nlmsvc_proc_lock_msg(struct svc_rqst *rqstp)
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{
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dprintk("lockd: LOCK_MSG called\n");
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return nlmsvc_callback(rqstp, NLMPROC_LOCK_RES, __nlmsvc_proc_lock);
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}
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static __be32 nlmsvc_proc_cancel_msg(struct svc_rqst *rqstp)
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{
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dprintk("lockd: CANCEL_MSG called\n");
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return nlmsvc_callback(rqstp, NLMPROC_CANCEL_RES, __nlmsvc_proc_cancel);
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}
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static __be32
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nlmsvc_proc_unlock_msg(struct svc_rqst *rqstp)
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{
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dprintk("lockd: UNLOCK_MSG called\n");
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return nlmsvc_callback(rqstp, NLMPROC_UNLOCK_RES, __nlmsvc_proc_unlock);
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}
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static __be32
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nlmsvc_proc_granted_msg(struct svc_rqst *rqstp)
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{
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dprintk("lockd: GRANTED_MSG called\n");
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return nlmsvc_callback(rqstp, NLMPROC_GRANTED_RES, __nlmsvc_proc_granted);
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}
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/*
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* SHARE: create a DOS share or alter existing share.
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*/
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static __be32
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nlmsvc_proc_share(struct svc_rqst *rqstp)
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{
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struct nlm_args *argp = rqstp->rq_argp;
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struct nlm_res *resp = rqstp->rq_resp;
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struct nlm_host *host;
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struct nlm_file *file;
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dprintk("lockd: SHARE called\n");
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resp->cookie = argp->cookie;
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/* Don't accept new lock requests during grace period */
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if (locks_in_grace(SVC_NET(rqstp)) && !argp->reclaim) {
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resp->status = nlm_lck_denied_grace_period;
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return rpc_success;
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}
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/* Obtain client and file */
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if ((resp->status = nlmsvc_retrieve_args(rqstp, argp, &host, &file)))
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return resp->status == nlm_drop_reply ? rpc_drop_reply :rpc_success;
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/* Now try to create the share */
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resp->status = cast_status(nlmsvc_share_file(host, file, argp));
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dprintk("lockd: SHARE status %d\n", ntohl(resp->status));
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nlmsvc_release_host(host);
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nlm_release_file(file);
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return rpc_success;
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}
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/*
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* UNSHARE: Release a DOS share.
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*/
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static __be32
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nlmsvc_proc_unshare(struct svc_rqst *rqstp)
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{
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struct nlm_args *argp = rqstp->rq_argp;
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struct nlm_res *resp = rqstp->rq_resp;
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struct nlm_host *host;
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struct nlm_file *file;
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dprintk("lockd: UNSHARE called\n");
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resp->cookie = argp->cookie;
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/* Don't accept requests during grace period */
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if (locks_in_grace(SVC_NET(rqstp))) {
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resp->status = nlm_lck_denied_grace_period;
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return rpc_success;
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}
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|
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/* Obtain client and file */
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if ((resp->status = nlmsvc_retrieve_args(rqstp, argp, &host, &file)))
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return resp->status == nlm_drop_reply ? rpc_drop_reply :rpc_success;
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/* Now try to unshare the file */
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resp->status = cast_status(nlmsvc_unshare_file(host, file, argp));
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dprintk("lockd: UNSHARE status %d\n", ntohl(resp->status));
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nlmsvc_release_host(host);
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nlm_release_file(file);
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return rpc_success;
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}
|
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|
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/*
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* NM_LOCK: Create an unmonitored lock
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*/
|
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static __be32
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nlmsvc_proc_nm_lock(struct svc_rqst *rqstp)
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{
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struct nlm_args *argp = rqstp->rq_argp;
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dprintk("lockd: NM_LOCK called\n");
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argp->monitor = 0; /* just clean the monitor flag */
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return nlmsvc_proc_lock(rqstp);
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}
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|
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/*
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* FREE_ALL: Release all locks and shares held by client
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*/
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static __be32
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nlmsvc_proc_free_all(struct svc_rqst *rqstp)
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{
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struct nlm_args *argp = rqstp->rq_argp;
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struct nlm_host *host;
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|
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/* Obtain client */
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if (nlmsvc_retrieve_args(rqstp, argp, &host, NULL))
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return rpc_success;
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|
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nlmsvc_free_host_resources(host);
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nlmsvc_release_host(host);
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return rpc_success;
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}
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|
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/*
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* SM_NOTIFY: private callback from statd (not part of official NLM proto)
|
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*/
|
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static __be32
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nlmsvc_proc_sm_notify(struct svc_rqst *rqstp)
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{
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struct nlm_reboot *argp = rqstp->rq_argp;
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dprintk("lockd: SM_NOTIFY called\n");
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|
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if (!nlm_privileged_requester(rqstp)) {
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char buf[RPC_MAX_ADDRBUFLEN];
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printk(KERN_WARNING "lockd: rejected NSM callback from %s\n",
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svc_print_addr(rqstp, buf, sizeof(buf)));
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return rpc_system_err;
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}
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|
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nlm_host_rebooted(SVC_NET(rqstp), argp);
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return rpc_success;
|
|
}
|
|
|
|
/*
|
|
* client sent a GRANTED_RES, let's remove the associated block
|
|
*/
|
|
static __be32
|
|
nlmsvc_proc_granted_res(struct svc_rqst *rqstp)
|
|
{
|
|
struct nlm_res *argp = rqstp->rq_argp;
|
|
|
|
if (!nlmsvc_ops)
|
|
return rpc_success;
|
|
|
|
dprintk("lockd: GRANTED_RES called\n");
|
|
|
|
nlmsvc_grant_reply(&argp->cookie, argp->status);
|
|
return rpc_success;
|
|
}
|
|
|
|
/*
|
|
* NLM Server procedures.
|
|
*/
|
|
|
|
#define nlmsvc_encode_norep nlmsvc_encode_void
|
|
#define nlmsvc_decode_norep nlmsvc_decode_void
|
|
#define nlmsvc_decode_testres nlmsvc_decode_void
|
|
#define nlmsvc_decode_lockres nlmsvc_decode_void
|
|
#define nlmsvc_decode_unlockres nlmsvc_decode_void
|
|
#define nlmsvc_decode_cancelres nlmsvc_decode_void
|
|
#define nlmsvc_decode_grantedres nlmsvc_decode_void
|
|
|
|
#define nlmsvc_proc_none nlmsvc_proc_null
|
|
#define nlmsvc_proc_test_res nlmsvc_proc_null
|
|
#define nlmsvc_proc_lock_res nlmsvc_proc_null
|
|
#define nlmsvc_proc_cancel_res nlmsvc_proc_null
|
|
#define nlmsvc_proc_unlock_res nlmsvc_proc_null
|
|
|
|
struct nlm_void { int dummy; };
|
|
|
|
#define PROC(name, xargt, xrest, argt, rest, respsize) \
|
|
{ .pc_func = nlmsvc_proc_##name, \
|
|
.pc_decode = nlmsvc_decode_##xargt, \
|
|
.pc_encode = nlmsvc_encode_##xrest, \
|
|
.pc_release = NULL, \
|
|
.pc_argsize = sizeof(struct nlm_##argt), \
|
|
.pc_ressize = sizeof(struct nlm_##rest), \
|
|
.pc_xdrressize = respsize, \
|
|
}
|
|
|
|
#define Ck (1+XDR_QUADLEN(NLM_MAXCOOKIELEN)) /* cookie */
|
|
#define St 1 /* status */
|
|
#define No (1+1024/4) /* Net Obj */
|
|
#define Rg 2 /* range - offset + size */
|
|
|
|
const struct svc_procedure nlmsvc_procedures[] = {
|
|
PROC(null, void, void, void, void, 1),
|
|
PROC(test, testargs, testres, args, res, Ck+St+2+No+Rg),
|
|
PROC(lock, lockargs, res, args, res, Ck+St),
|
|
PROC(cancel, cancargs, res, args, res, Ck+St),
|
|
PROC(unlock, unlockargs, res, args, res, Ck+St),
|
|
PROC(granted, testargs, res, args, res, Ck+St),
|
|
PROC(test_msg, testargs, norep, args, void, 1),
|
|
PROC(lock_msg, lockargs, norep, args, void, 1),
|
|
PROC(cancel_msg, cancargs, norep, args, void, 1),
|
|
PROC(unlock_msg, unlockargs, norep, args, void, 1),
|
|
PROC(granted_msg, testargs, norep, args, void, 1),
|
|
PROC(test_res, testres, norep, res, void, 1),
|
|
PROC(lock_res, lockres, norep, res, void, 1),
|
|
PROC(cancel_res, cancelres, norep, res, void, 1),
|
|
PROC(unlock_res, unlockres, norep, res, void, 1),
|
|
PROC(granted_res, res, norep, res, void, 1),
|
|
/* statd callback */
|
|
PROC(sm_notify, reboot, void, reboot, void, 1),
|
|
PROC(none, void, void, void, void, 1),
|
|
PROC(none, void, void, void, void, 1),
|
|
PROC(none, void, void, void, void, 1),
|
|
PROC(share, shareargs, shareres, args, res, Ck+St+1),
|
|
PROC(unshare, shareargs, shareres, args, res, Ck+St+1),
|
|
PROC(nm_lock, lockargs, res, args, res, Ck+St),
|
|
PROC(free_all, notify, void, args, void, 0),
|
|
|
|
};
|