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-rw-r--r--fs/lockd/svcproc.c582
1 files changed, 582 insertions, 0 deletions
diff --git a/fs/lockd/svcproc.c b/fs/lockd/svcproc.c
new file mode 100644
index 000000000..ea77c66d3
--- /dev/null
+++ b/fs/lockd/svcproc.c
@@ -0,0 +1,582 @@
+// SPDX-License-Identifier: GPL-2.0
+/*
+ * linux/fs/lockd/svcproc.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/time.h>
+#include <linux/lockd/lockd.h>
+#include <linux/lockd/share.h>
+#include <linux/sunrpc/svc_xprt.h>
+
+#define NLMDBG_FACILITY NLMDBG_CLIENT
+
+#ifdef CONFIG_LOCKD_V4
+static __be32
+cast_to_nlm(__be32 status, u32 vers)
+{
+ /* Note: status is assumed to be in network byte order !!! */
+ if (vers != 4){
+ switch (status) {
+ case nlm_granted:
+ case nlm_lck_denied:
+ case nlm_lck_denied_nolocks:
+ case nlm_lck_blocked:
+ case nlm_lck_denied_grace_period:
+ case nlm_drop_reply:
+ break;
+ case nlm4_deadlock:
+ status = nlm_lck_denied;
+ break;
+ default:
+ status = nlm_lck_denied_nolocks;
+ }
+ }
+
+ return (status);
+}
+#define cast_status(status) (cast_to_nlm(status, rqstp->rq_vers))
+#else
+#define cast_status(status) (status)
+#endif
+
+/*
+ * Obtain client and file from arguments
+ */
+static __be32
+nlmsvc_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;
+ __be32 error = 0;
+
+ /* nfsd callbacks must have been installed for this procedure */
+ if (!nlmsvc_ops)
+ return nlm_lck_denied_nolocks;
+
+ /* Obtain host handle */
+ if (!(host = nlmsvc_lookup_host(rqstp, lock->caller, lock->len))
+ || (argp->monitor && nsm_monitor(host) < 0))
+ goto no_locks;
+ *hostp = host;
+
+ /* Obtain file pointer. Not used by FREE_ALL call. */
+ if (filp != NULL) {
+ error = cast_status(nlm_lookup_file(rqstp, &file, &lock->fh));
+ if (error != 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;
+ lock->fl.fl_lmops = &nlmsvc_lock_operations;
+ }
+
+ return 0;
+
+no_locks:
+ nlmsvc_release_host(host);
+ if (error)
+ return error;
+ return nlm_lck_denied_nolocks;
+}
+
+/*
+ * NULL: Test for presence of service
+ */
+static __be32
+nlmsvc_proc_null(struct svc_rqst *rqstp)
+{
+ dprintk("lockd: NULL called\n");
+ return rpc_success;
+}
+
+/*
+ * TEST: Check for conflicting lock
+ */
+static __be32
+__nlmsvc_proc_test(struct svc_rqst *rqstp, struct nlm_res *resp)
+{
+ struct nlm_args *argp = rqstp->rq_argp;
+ struct nlm_host *host;
+ struct nlm_file *file;
+ __be32 rc = rpc_success;
+
+ dprintk("lockd: TEST called\n");
+ resp->cookie = argp->cookie;
+
+ /* Obtain client and file */
+ if ((resp->status = nlmsvc_retrieve_args(rqstp, argp, &host, &file)))
+ return resp->status == nlm_drop_reply ? rpc_drop_reply :rpc_success;
+
+ /* Now check for conflicting locks */
+ resp->status = cast_status(nlmsvc_testlock(rqstp, file, host, &argp->lock, &resp->lock, &resp->cookie));
+ if (resp->status == nlm_drop_reply)
+ rc = rpc_drop_reply;
+ else
+ dprintk("lockd: TEST status %d vers %d\n",
+ ntohl(resp->status), rqstp->rq_vers);
+
+ nlmsvc_release_host(host);
+ nlm_release_file(file);
+ return rc;
+}
+
+static __be32
+nlmsvc_proc_test(struct svc_rqst *rqstp)
+{
+ return __nlmsvc_proc_test(rqstp, rqstp->rq_resp);
+}
+
+static __be32
+__nlmsvc_proc_lock(struct svc_rqst *rqstp, struct nlm_res *resp)
+{
+ struct nlm_args *argp = rqstp->rq_argp;
+ struct nlm_host *host;
+ struct nlm_file *file;
+ __be32 rc = rpc_success;
+
+ dprintk("lockd: LOCK called\n");
+
+ resp->cookie = argp->cookie;
+
+ /* Obtain client and file */
+ if ((resp->status = nlmsvc_retrieve_args(rqstp, argp, &host, &file)))
+ return resp->status == nlm_drop_reply ? rpc_drop_reply :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 = cast_status(nlmsvc_lock(rqstp, file, host, &argp->lock,
+ argp->block, &argp->cookie,
+ argp->reclaim));
+ if (resp->status == nlm_drop_reply)
+ rc = rpc_drop_reply;
+ else
+ dprintk("lockd: LOCK status %d\n", ntohl(resp->status));
+
+ nlmsvc_release_host(host);
+ nlm_release_file(file);
+ return rc;
+}
+
+static __be32
+nlmsvc_proc_lock(struct svc_rqst *rqstp)
+{
+ return __nlmsvc_proc_lock(rqstp, rqstp->rq_resp);
+}
+
+static __be32
+__nlmsvc_proc_cancel(struct svc_rqst *rqstp, struct nlm_res *resp)
+{
+ struct nlm_args *argp = rqstp->rq_argp;
+ struct nlm_host *host;
+ struct nlm_file *file;
+ struct net *net = SVC_NET(rqstp);
+
+ dprintk("lockd: CANCEL called\n");
+
+ resp->cookie = argp->cookie;
+
+ /* Don't accept requests during grace period */
+ if (locks_in_grace(net)) {
+ resp->status = nlm_lck_denied_grace_period;
+ return rpc_success;
+ }
+
+ /* Obtain client and file */
+ if ((resp->status = nlmsvc_retrieve_args(rqstp, argp, &host, &file)))
+ return resp->status == nlm_drop_reply ? rpc_drop_reply :rpc_success;
+
+ /* Try to cancel request. */
+ resp->status = cast_status(nlmsvc_cancel_blocked(net, file, &argp->lock));
+
+ dprintk("lockd: CANCEL status %d\n", ntohl(resp->status));
+ nlmsvc_release_host(host);
+ nlm_release_file(file);
+ return rpc_success;
+}
+
+static __be32
+nlmsvc_proc_cancel(struct svc_rqst *rqstp)
+{
+ return __nlmsvc_proc_cancel(rqstp, rqstp->rq_resp);
+}
+
+/*
+ * UNLOCK: release a lock
+ */
+static __be32
+__nlmsvc_proc_unlock(struct svc_rqst *rqstp, struct nlm_res *resp)
+{
+ struct nlm_args *argp = rqstp->rq_argp;
+ struct nlm_host *host;
+ struct nlm_file *file;
+ struct net *net = SVC_NET(rqstp);
+
+ dprintk("lockd: UNLOCK called\n");
+
+ resp->cookie = argp->cookie;
+
+ /* Don't accept new lock requests during grace period */
+ if (locks_in_grace(net)) {
+ resp->status = nlm_lck_denied_grace_period;
+ return rpc_success;
+ }
+
+ /* Obtain client and file */
+ if ((resp->status = nlmsvc_retrieve_args(rqstp, argp, &host, &file)))
+ return resp->status == nlm_drop_reply ? rpc_drop_reply :rpc_success;
+
+ /* Now try to remove the lock */
+ resp->status = cast_status(nlmsvc_unlock(net, file, &argp->lock));
+
+ dprintk("lockd: UNLOCK status %d\n", ntohl(resp->status));
+ nlmsvc_release_host(host);
+ nlm_release_file(file);
+ return rpc_success;
+}
+
+static __be32
+nlmsvc_proc_unlock(struct svc_rqst *rqstp)
+{
+ return __nlmsvc_proc_unlock(rqstp, rqstp->rq_resp);
+}
+
+/*
+ * GRANTED: A server calls us to tell that a process' lock request
+ * was granted
+ */
+static __be32
+__nlmsvc_proc_granted(struct svc_rqst *rqstp, struct nlm_res *resp)
+{
+ struct nlm_args *argp = rqstp->rq_argp;
+
+ resp->cookie = argp->cookie;
+
+ dprintk("lockd: GRANTED called\n");
+ resp->status = nlmclnt_grant(svc_addr(rqstp), &argp->lock);
+ dprintk("lockd: GRANTED status %d\n", ntohl(resp->status));
+ return rpc_success;
+}
+
+static __be32
+nlmsvc_proc_granted(struct svc_rqst *rqstp)
+{
+ return __nlmsvc_proc_granted(rqstp, rqstp->rq_resp);
+}
+
+/*
+ * This is the generic lockd callback for async RPC calls
+ */
+static void nlmsvc_callback_exit(struct rpc_task *task, void *data)
+{
+ dprintk("lockd: %5u callback returned %d\n", task->tk_pid,
+ -task->tk_status);
+}
+
+void nlmsvc_release_call(struct nlm_rqst *call)
+{
+ if (!refcount_dec_and_test(&call->a_count))
+ return;
+ nlmsvc_release_host(call->a_host);
+ kfree(call);
+}
+
+static void nlmsvc_callback_release(void *data)
+{
+ nlmsvc_release_call(data);
+}
+
+static const struct rpc_call_ops nlmsvc_callback_ops = {
+ .rpc_call_done = nlmsvc_callback_exit,
+ .rpc_release = nlmsvc_callback_release,
+};
+
+/*
+ * `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 __be32 nlmsvc_callback(struct svc_rqst *rqstp, u32 proc,
+ __be32 (*func)(struct svc_rqst *, struct nlm_res *))
+{
+ struct nlm_args *argp = rqstp->rq_argp;
+ struct nlm_host *host;
+ struct nlm_rqst *call;
+ __be32 stat;
+
+ host = nlmsvc_lookup_host(rqstp,
+ argp->lock.caller,
+ argp->lock.len);
+ if (host == NULL)
+ return rpc_system_err;
+
+ call = nlm_alloc_call(host);
+ nlmsvc_release_host(host);
+ if (call == NULL)
+ return rpc_system_err;
+
+ stat = func(rqstp, &call->a_res);
+ if (stat != 0) {
+ nlmsvc_release_call(call);
+ return stat;
+ }
+
+ call->a_flags = RPC_TASK_ASYNC;
+ if (nlm_async_reply(call, proc, &nlmsvc_callback_ops) < 0)
+ return rpc_system_err;
+ return rpc_success;
+}
+
+static __be32 nlmsvc_proc_test_msg(struct svc_rqst *rqstp)
+{
+ dprintk("lockd: TEST_MSG called\n");
+ return nlmsvc_callback(rqstp, NLMPROC_TEST_RES, __nlmsvc_proc_test);
+}
+
+static __be32 nlmsvc_proc_lock_msg(struct svc_rqst *rqstp)
+{
+ dprintk("lockd: LOCK_MSG called\n");
+ return nlmsvc_callback(rqstp, NLMPROC_LOCK_RES, __nlmsvc_proc_lock);
+}
+
+static __be32 nlmsvc_proc_cancel_msg(struct svc_rqst *rqstp)
+{
+ dprintk("lockd: CANCEL_MSG called\n");
+ return nlmsvc_callback(rqstp, NLMPROC_CANCEL_RES, __nlmsvc_proc_cancel);
+}
+
+static __be32
+nlmsvc_proc_unlock_msg(struct svc_rqst *rqstp)
+{
+ dprintk("lockd: UNLOCK_MSG called\n");
+ return nlmsvc_callback(rqstp, NLMPROC_UNLOCK_RES, __nlmsvc_proc_unlock);
+}
+
+static __be32
+nlmsvc_proc_granted_msg(struct svc_rqst *rqstp)
+{
+ dprintk("lockd: GRANTED_MSG called\n");
+ return nlmsvc_callback(rqstp, NLMPROC_GRANTED_RES, __nlmsvc_proc_granted);
+}
+
+/*
+ * SHARE: create a DOS share or alter existing share.
+ */
+static __be32
+nlmsvc_proc_share(struct svc_rqst *rqstp)
+{
+ struct nlm_args *argp = rqstp->rq_argp;
+ struct nlm_res *resp = rqstp->rq_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 (locks_in_grace(SVC_NET(rqstp)) && !argp->reclaim) {
+ resp->status = nlm_lck_denied_grace_period;
+ return rpc_success;
+ }
+
+ /* Obtain client and file */
+ if ((resp->status = nlmsvc_retrieve_args(rqstp, argp, &host, &file)))
+ return resp->status == nlm_drop_reply ? rpc_drop_reply :rpc_success;
+
+ /* Now try to create the share */
+ resp->status = cast_status(nlmsvc_share_file(host, file, argp));
+
+ dprintk("lockd: SHARE status %d\n", ntohl(resp->status));
+ nlmsvc_release_host(host);
+ nlm_release_file(file);
+ return rpc_success;
+}
+
+/*
+ * UNSHARE: Release a DOS share.
+ */
+static __be32
+nlmsvc_proc_unshare(struct svc_rqst *rqstp)
+{
+ struct nlm_args *argp = rqstp->rq_argp;
+ struct nlm_res *resp = rqstp->rq_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 (locks_in_grace(SVC_NET(rqstp))) {
+ resp->status = nlm_lck_denied_grace_period;
+ return rpc_success;
+ }
+
+ /* Obtain client and file */
+ if ((resp->status = nlmsvc_retrieve_args(rqstp, argp, &host, &file)))
+ return resp->status == nlm_drop_reply ? rpc_drop_reply :rpc_success;
+
+ /* Now try to unshare the file */
+ resp->status = cast_status(nlmsvc_unshare_file(host, file, argp));
+
+ dprintk("lockd: UNSHARE status %d\n", ntohl(resp->status));
+ nlmsvc_release_host(host);
+ nlm_release_file(file);
+ return rpc_success;
+}
+
+/*
+ * NM_LOCK: Create an unmonitored lock
+ */
+static __be32
+nlmsvc_proc_nm_lock(struct svc_rqst *rqstp)
+{
+ struct nlm_args *argp = rqstp->rq_argp;
+
+ dprintk("lockd: NM_LOCK called\n");
+
+ argp->monitor = 0; /* just clean the monitor flag */
+ return nlmsvc_proc_lock(rqstp);
+}
+
+/*
+ * FREE_ALL: Release all locks and shares held by client
+ */
+static __be32
+nlmsvc_proc_free_all(struct svc_rqst *rqstp)
+{
+ struct nlm_args *argp = rqstp->rq_argp;
+ struct nlm_host *host;
+
+ /* Obtain client */
+ if (nlmsvc_retrieve_args(rqstp, argp, &host, NULL))
+ return rpc_success;
+
+ nlmsvc_free_host_resources(host);
+ nlmsvc_release_host(host);
+ return rpc_success;
+}
+
+/*
+ * SM_NOTIFY: private callback from statd (not part of official NLM proto)
+ */
+static __be32
+nlmsvc_proc_sm_notify(struct svc_rqst *rqstp)
+{
+ struct nlm_reboot *argp = rqstp->rq_argp;
+
+ dprintk("lockd: SM_NOTIFY called\n");
+
+ if (!nlm_privileged_requester(rqstp)) {
+ char buf[RPC_MAX_ADDRBUFLEN];
+ printk(KERN_WARNING "lockd: rejected NSM callback from %s\n",
+ svc_print_addr(rqstp, buf, sizeof(buf)));
+ return rpc_system_err;
+ }
+
+ nlm_host_rebooted(SVC_NET(rqstp), argp);
+ 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),
+
+};
generated by cgit v1.2.3 (git 2.39.1) at 2024-12-03 21:29:10 +0000