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![Chuck Lever](/assets/img/avatar_default.png)
In addition to the benefits of using an enum rather than a set of macros, we now have a named type that can improve static type checking of function return values. As part of this change, I removed a stale comment from svcauth.h; the return values from current implementations of the auth_ops::release method are all zero/negative errno, not the SVC_OK enum values as the old comment suggested. Suggested-by: NeilBrown <neilb@suse.de> Signed-off-by: Chuck Lever <chuck.lever@oracle.com>
728 lines
17 KiB
C
728 lines
17 KiB
C
// SPDX-License-Identifier: GPL-2.0-only
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/*
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* linux/fs/lockd/svc.c
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*
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* This is the central lockd service.
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*
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* FIXME: Separate the lockd NFS server functionality from the lockd NFS
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* client functionality. Oh why didn't Sun create two separate
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* services in the first place?
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*
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* Authors: Olaf Kirch (okir@monad.swb.de)
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*
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* Copyright (C) 1995, 1996 Olaf Kirch <okir@monad.swb.de>
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*/
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#include <linux/module.h>
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#include <linux/init.h>
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#include <linux/sysctl.h>
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#include <linux/moduleparam.h>
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#include <linux/sched/signal.h>
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#include <linux/errno.h>
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#include <linux/in.h>
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#include <linux/uio.h>
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#include <linux/smp.h>
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#include <linux/mutex.h>
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#include <linux/kthread.h>
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#include <linux/freezer.h>
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#include <linux/inetdevice.h>
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#include <linux/sunrpc/types.h>
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#include <linux/sunrpc/stats.h>
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#include <linux/sunrpc/clnt.h>
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#include <linux/sunrpc/svc.h>
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#include <linux/sunrpc/svcsock.h>
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#include <linux/sunrpc/svc_xprt.h>
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#include <net/ip.h>
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#include <net/addrconf.h>
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#include <net/ipv6.h>
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#include <linux/lockd/lockd.h>
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#include <linux/nfs.h>
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#include "netns.h"
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#include "procfs.h"
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#define NLMDBG_FACILITY NLMDBG_SVC
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#define LOCKD_BUFSIZE (1024 + NLMSVC_XDRSIZE)
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static struct svc_program nlmsvc_program;
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const struct nlmsvc_binding *nlmsvc_ops;
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EXPORT_SYMBOL_GPL(nlmsvc_ops);
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static DEFINE_MUTEX(nlmsvc_mutex);
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static unsigned int nlmsvc_users;
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static struct svc_serv *nlmsvc_serv;
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unsigned long nlmsvc_timeout;
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static void nlmsvc_request_retry(struct timer_list *tl)
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{
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svc_wake_up(nlmsvc_serv);
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}
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DEFINE_TIMER(nlmsvc_retry, nlmsvc_request_retry);
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unsigned int lockd_net_id;
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/*
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* These can be set at insmod time (useful for NFS as root filesystem),
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* and also changed through the sysctl interface. -- Jamie Lokier, Aug 2003
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*/
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static unsigned long nlm_grace_period;
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static unsigned long nlm_timeout = LOCKD_DFLT_TIMEO;
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static int nlm_udpport, nlm_tcpport;
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/* RLIM_NOFILE defaults to 1024. That seems like a reasonable default here. */
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static unsigned int nlm_max_connections = 1024;
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/*
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* Constants needed for the sysctl interface.
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*/
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static const unsigned long nlm_grace_period_min = 0;
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static const unsigned long nlm_grace_period_max = 240;
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static const unsigned long nlm_timeout_min = 3;
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static const unsigned long nlm_timeout_max = 20;
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#ifdef CONFIG_SYSCTL
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static const int nlm_port_min = 0, nlm_port_max = 65535;
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static struct ctl_table_header * nlm_sysctl_table;
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#endif
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static unsigned long get_lockd_grace_period(void)
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{
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/* Note: nlm_timeout should always be nonzero */
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if (nlm_grace_period)
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return roundup(nlm_grace_period, nlm_timeout) * HZ;
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else
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return nlm_timeout * 5 * HZ;
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}
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static void grace_ender(struct work_struct *grace)
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{
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struct delayed_work *dwork = to_delayed_work(grace);
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struct lockd_net *ln = container_of(dwork, struct lockd_net,
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grace_period_end);
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locks_end_grace(&ln->lockd_manager);
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}
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static void set_grace_period(struct net *net)
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{
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unsigned long grace_period = get_lockd_grace_period();
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struct lockd_net *ln = net_generic(net, lockd_net_id);
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locks_start_grace(net, &ln->lockd_manager);
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cancel_delayed_work_sync(&ln->grace_period_end);
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schedule_delayed_work(&ln->grace_period_end, grace_period);
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}
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/*
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* This is the lockd kernel thread
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*/
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static int
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lockd(void *vrqstp)
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{
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struct svc_rqst *rqstp = vrqstp;
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struct net *net = &init_net;
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struct lockd_net *ln = net_generic(net, lockd_net_id);
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/* try_to_freeze() is called from svc_recv() */
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set_freezable();
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dprintk("NFS locking service started (ver " LOCKD_VERSION ").\n");
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/*
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* The main request loop. We don't terminate until the last
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* NFS mount or NFS daemon has gone away.
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*/
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while (!kthread_should_stop()) {
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/* update sv_maxconn if it has changed */
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rqstp->rq_server->sv_maxconn = nlm_max_connections;
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nlmsvc_retry_blocked();
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svc_recv(rqstp);
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}
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if (nlmsvc_ops)
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nlmsvc_invalidate_all();
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nlm_shutdown_hosts();
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cancel_delayed_work_sync(&ln->grace_period_end);
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locks_end_grace(&ln->lockd_manager);
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dprintk("lockd_down: service stopped\n");
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svc_exit_thread(rqstp);
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return 0;
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}
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static int create_lockd_listener(struct svc_serv *serv, const char *name,
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struct net *net, const int family,
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const unsigned short port,
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const struct cred *cred)
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{
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struct svc_xprt *xprt;
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xprt = svc_find_xprt(serv, name, net, family, 0);
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if (xprt == NULL)
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return svc_xprt_create(serv, name, net, family, port,
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SVC_SOCK_DEFAULTS, cred);
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svc_xprt_put(xprt);
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return 0;
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}
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static int create_lockd_family(struct svc_serv *serv, struct net *net,
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const int family, const struct cred *cred)
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{
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int err;
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err = create_lockd_listener(serv, "udp", net, family, nlm_udpport,
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cred);
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if (err < 0)
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return err;
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return create_lockd_listener(serv, "tcp", net, family, nlm_tcpport,
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cred);
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}
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/*
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* Ensure there are active UDP and TCP listeners for lockd.
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*
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* Even if we have only TCP NFS mounts and/or TCP NFSDs, some
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* local services (such as rpc.statd) still require UDP, and
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* some NFS servers do not yet support NLM over TCP.
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*
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* Returns zero if all listeners are available; otherwise a
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* negative errno value is returned.
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*/
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static int make_socks(struct svc_serv *serv, struct net *net,
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const struct cred *cred)
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{
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static int warned;
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int err;
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err = create_lockd_family(serv, net, PF_INET, cred);
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if (err < 0)
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goto out_err;
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err = create_lockd_family(serv, net, PF_INET6, cred);
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if (err < 0 && err != -EAFNOSUPPORT)
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goto out_err;
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warned = 0;
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return 0;
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out_err:
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if (warned++ == 0)
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printk(KERN_WARNING
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"lockd_up: makesock failed, error=%d\n", err);
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svc_xprt_destroy_all(serv, net);
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svc_rpcb_cleanup(serv, net);
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return err;
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}
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static int lockd_up_net(struct svc_serv *serv, struct net *net,
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const struct cred *cred)
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{
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struct lockd_net *ln = net_generic(net, lockd_net_id);
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int error;
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if (ln->nlmsvc_users++)
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return 0;
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error = svc_bind(serv, net);
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if (error)
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goto err_bind;
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error = make_socks(serv, net, cred);
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if (error < 0)
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goto err_bind;
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set_grace_period(net);
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dprintk("%s: per-net data created; net=%x\n", __func__, net->ns.inum);
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return 0;
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err_bind:
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ln->nlmsvc_users--;
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return error;
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}
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static void lockd_down_net(struct svc_serv *serv, struct net *net)
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{
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struct lockd_net *ln = net_generic(net, lockd_net_id);
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if (ln->nlmsvc_users) {
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if (--ln->nlmsvc_users == 0) {
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nlm_shutdown_hosts_net(net);
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cancel_delayed_work_sync(&ln->grace_period_end);
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locks_end_grace(&ln->lockd_manager);
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svc_xprt_destroy_all(serv, net);
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svc_rpcb_cleanup(serv, net);
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}
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} else {
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pr_err("%s: no users! net=%x\n",
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__func__, net->ns.inum);
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BUG();
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}
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}
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static int lockd_inetaddr_event(struct notifier_block *this,
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unsigned long event, void *ptr)
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{
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struct in_ifaddr *ifa = (struct in_ifaddr *)ptr;
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struct sockaddr_in sin;
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if (event != NETDEV_DOWN)
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goto out;
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if (nlmsvc_serv) {
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dprintk("lockd_inetaddr_event: removed %pI4\n",
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&ifa->ifa_local);
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sin.sin_family = AF_INET;
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sin.sin_addr.s_addr = ifa->ifa_local;
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svc_age_temp_xprts_now(nlmsvc_serv, (struct sockaddr *)&sin);
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}
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out:
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return NOTIFY_DONE;
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}
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static struct notifier_block lockd_inetaddr_notifier = {
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.notifier_call = lockd_inetaddr_event,
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};
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#if IS_ENABLED(CONFIG_IPV6)
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static int lockd_inet6addr_event(struct notifier_block *this,
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unsigned long event, void *ptr)
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{
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struct inet6_ifaddr *ifa = (struct inet6_ifaddr *)ptr;
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struct sockaddr_in6 sin6;
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if (event != NETDEV_DOWN)
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goto out;
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if (nlmsvc_serv) {
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dprintk("lockd_inet6addr_event: removed %pI6\n", &ifa->addr);
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sin6.sin6_family = AF_INET6;
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sin6.sin6_addr = ifa->addr;
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if (ipv6_addr_type(&sin6.sin6_addr) & IPV6_ADDR_LINKLOCAL)
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sin6.sin6_scope_id = ifa->idev->dev->ifindex;
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svc_age_temp_xprts_now(nlmsvc_serv, (struct sockaddr *)&sin6);
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}
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out:
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return NOTIFY_DONE;
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}
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static struct notifier_block lockd_inet6addr_notifier = {
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.notifier_call = lockd_inet6addr_event,
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};
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#endif
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static int lockd_get(void)
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{
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struct svc_serv *serv;
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int error;
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if (nlmsvc_serv) {
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nlmsvc_users++;
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return 0;
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}
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/*
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* Sanity check: if there's no pid,
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* we should be the first user ...
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*/
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if (nlmsvc_users)
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printk(KERN_WARNING
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"lockd_up: no pid, %d users??\n", nlmsvc_users);
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if (!nlm_timeout)
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nlm_timeout = LOCKD_DFLT_TIMEO;
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nlmsvc_timeout = nlm_timeout * HZ;
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serv = svc_create(&nlmsvc_program, LOCKD_BUFSIZE, lockd);
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if (!serv) {
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printk(KERN_WARNING "lockd_up: create service failed\n");
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return -ENOMEM;
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}
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serv->sv_maxconn = nlm_max_connections;
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error = svc_set_num_threads(serv, NULL, 1);
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/* The thread now holds the only reference */
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svc_put(serv);
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if (error < 0)
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return error;
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nlmsvc_serv = serv;
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register_inetaddr_notifier(&lockd_inetaddr_notifier);
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#if IS_ENABLED(CONFIG_IPV6)
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register_inet6addr_notifier(&lockd_inet6addr_notifier);
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#endif
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dprintk("lockd_up: service created\n");
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nlmsvc_users++;
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return 0;
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}
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static void lockd_put(void)
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{
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if (WARN(nlmsvc_users <= 0, "lockd_down: no users!\n"))
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return;
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if (--nlmsvc_users)
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return;
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unregister_inetaddr_notifier(&lockd_inetaddr_notifier);
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#if IS_ENABLED(CONFIG_IPV6)
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unregister_inet6addr_notifier(&lockd_inet6addr_notifier);
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#endif
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svc_set_num_threads(nlmsvc_serv, NULL, 0);
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timer_delete_sync(&nlmsvc_retry);
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nlmsvc_serv = NULL;
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dprintk("lockd_down: service destroyed\n");
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}
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/*
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* Bring up the lockd process if it's not already up.
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*/
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int lockd_up(struct net *net, const struct cred *cred)
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{
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int error;
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mutex_lock(&nlmsvc_mutex);
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error = lockd_get();
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if (error)
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goto err;
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error = lockd_up_net(nlmsvc_serv, net, cred);
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if (error < 0) {
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lockd_put();
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goto err;
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}
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err:
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mutex_unlock(&nlmsvc_mutex);
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return error;
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}
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EXPORT_SYMBOL_GPL(lockd_up);
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/*
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* Decrement the user count and bring down lockd if we're the last.
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*/
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void
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lockd_down(struct net *net)
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{
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mutex_lock(&nlmsvc_mutex);
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lockd_down_net(nlmsvc_serv, net);
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lockd_put();
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mutex_unlock(&nlmsvc_mutex);
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}
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EXPORT_SYMBOL_GPL(lockd_down);
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#ifdef CONFIG_SYSCTL
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/*
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* Sysctl parameters (same as module parameters, different interface).
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*/
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static struct ctl_table nlm_sysctls[] = {
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{
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.procname = "nlm_grace_period",
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.data = &nlm_grace_period,
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.maxlen = sizeof(unsigned long),
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.mode = 0644,
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.proc_handler = proc_doulongvec_minmax,
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.extra1 = (unsigned long *) &nlm_grace_period_min,
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.extra2 = (unsigned long *) &nlm_grace_period_max,
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},
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{
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.procname = "nlm_timeout",
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.data = &nlm_timeout,
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.maxlen = sizeof(unsigned long),
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.mode = 0644,
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.proc_handler = proc_doulongvec_minmax,
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.extra1 = (unsigned long *) &nlm_timeout_min,
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.extra2 = (unsigned long *) &nlm_timeout_max,
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},
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{
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.procname = "nlm_udpport",
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.data = &nlm_udpport,
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.maxlen = sizeof(int),
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.mode = 0644,
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.proc_handler = proc_dointvec_minmax,
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.extra1 = (int *) &nlm_port_min,
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.extra2 = (int *) &nlm_port_max,
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},
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{
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.procname = "nlm_tcpport",
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.data = &nlm_tcpport,
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.maxlen = sizeof(int),
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.mode = 0644,
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.proc_handler = proc_dointvec_minmax,
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.extra1 = (int *) &nlm_port_min,
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.extra2 = (int *) &nlm_port_max,
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},
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{
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.procname = "nsm_use_hostnames",
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.data = &nsm_use_hostnames,
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.maxlen = sizeof(bool),
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.mode = 0644,
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.proc_handler = proc_dobool,
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},
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{
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.procname = "nsm_local_state",
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.data = &nsm_local_state,
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.maxlen = sizeof(int),
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.mode = 0644,
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.proc_handler = proc_dointvec,
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},
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{ }
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};
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#endif /* CONFIG_SYSCTL */
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/*
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* Module (and sysfs) parameters.
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*/
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#define param_set_min_max(name, type, which_strtol, min, max) \
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static int param_set_##name(const char *val, const struct kernel_param *kp) \
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{ \
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char *endp; \
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__typeof__(type) num = which_strtol(val, &endp, 0); \
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if (endp == val || *endp || num < (min) || num > (max)) \
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return -EINVAL; \
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*((type *) kp->arg) = num; \
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return 0; \
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}
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static inline int is_callback(u32 proc)
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{
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return proc == NLMPROC_GRANTED
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|| proc == NLMPROC_GRANTED_MSG
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|| proc == NLMPROC_TEST_RES
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|| proc == NLMPROC_LOCK_RES
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|| proc == NLMPROC_CANCEL_RES
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|| proc == NLMPROC_UNLOCK_RES
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|| proc == NLMPROC_NSM_NOTIFY;
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}
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static enum svc_auth_status lockd_authenticate(struct svc_rqst *rqstp)
|
|
{
|
|
rqstp->rq_client = NULL;
|
|
switch (rqstp->rq_authop->flavour) {
|
|
case RPC_AUTH_NULL:
|
|
case RPC_AUTH_UNIX:
|
|
rqstp->rq_auth_stat = rpc_auth_ok;
|
|
if (rqstp->rq_proc == 0)
|
|
return SVC_OK;
|
|
if (is_callback(rqstp->rq_proc)) {
|
|
/* Leave it to individual procedures to
|
|
* call nlmsvc_lookup_host(rqstp)
|
|
*/
|
|
return SVC_OK;
|
|
}
|
|
return svc_set_client(rqstp);
|
|
}
|
|
rqstp->rq_auth_stat = rpc_autherr_badcred;
|
|
return SVC_DENIED;
|
|
}
|
|
|
|
|
|
param_set_min_max(port, int, simple_strtol, 0, 65535)
|
|
param_set_min_max(grace_period, unsigned long, simple_strtoul,
|
|
nlm_grace_period_min, nlm_grace_period_max)
|
|
param_set_min_max(timeout, unsigned long, simple_strtoul,
|
|
nlm_timeout_min, nlm_timeout_max)
|
|
|
|
MODULE_AUTHOR("Olaf Kirch <okir@monad.swb.de>");
|
|
MODULE_DESCRIPTION("NFS file locking service version " LOCKD_VERSION ".");
|
|
MODULE_LICENSE("GPL");
|
|
|
|
module_param_call(nlm_grace_period, param_set_grace_period, param_get_ulong,
|
|
&nlm_grace_period, 0644);
|
|
module_param_call(nlm_timeout, param_set_timeout, param_get_ulong,
|
|
&nlm_timeout, 0644);
|
|
module_param_call(nlm_udpport, param_set_port, param_get_int,
|
|
&nlm_udpport, 0644);
|
|
module_param_call(nlm_tcpport, param_set_port, param_get_int,
|
|
&nlm_tcpport, 0644);
|
|
module_param(nsm_use_hostnames, bool, 0644);
|
|
module_param(nlm_max_connections, uint, 0644);
|
|
|
|
static int lockd_init_net(struct net *net)
|
|
{
|
|
struct lockd_net *ln = net_generic(net, lockd_net_id);
|
|
|
|
INIT_DELAYED_WORK(&ln->grace_period_end, grace_ender);
|
|
INIT_LIST_HEAD(&ln->lockd_manager.list);
|
|
ln->lockd_manager.block_opens = false;
|
|
INIT_LIST_HEAD(&ln->nsm_handles);
|
|
return 0;
|
|
}
|
|
|
|
static void lockd_exit_net(struct net *net)
|
|
{
|
|
struct lockd_net *ln = net_generic(net, lockd_net_id);
|
|
|
|
WARN_ONCE(!list_empty(&ln->lockd_manager.list),
|
|
"net %x %s: lockd_manager.list is not empty\n",
|
|
net->ns.inum, __func__);
|
|
WARN_ONCE(!list_empty(&ln->nsm_handles),
|
|
"net %x %s: nsm_handles list is not empty\n",
|
|
net->ns.inum, __func__);
|
|
WARN_ONCE(delayed_work_pending(&ln->grace_period_end),
|
|
"net %x %s: grace_period_end was not cancelled\n",
|
|
net->ns.inum, __func__);
|
|
}
|
|
|
|
static struct pernet_operations lockd_net_ops = {
|
|
.init = lockd_init_net,
|
|
.exit = lockd_exit_net,
|
|
.id = &lockd_net_id,
|
|
.size = sizeof(struct lockd_net),
|
|
};
|
|
|
|
|
|
/*
|
|
* Initialising and terminating the module.
|
|
*/
|
|
|
|
static int __init init_nlm(void)
|
|
{
|
|
int err;
|
|
|
|
#ifdef CONFIG_SYSCTL
|
|
err = -ENOMEM;
|
|
nlm_sysctl_table = register_sysctl("fs/nfs", nlm_sysctls);
|
|
if (nlm_sysctl_table == NULL)
|
|
goto err_sysctl;
|
|
#endif
|
|
err = register_pernet_subsys(&lockd_net_ops);
|
|
if (err)
|
|
goto err_pernet;
|
|
|
|
err = lockd_create_procfs();
|
|
if (err)
|
|
goto err_procfs;
|
|
|
|
return 0;
|
|
|
|
err_procfs:
|
|
unregister_pernet_subsys(&lockd_net_ops);
|
|
err_pernet:
|
|
#ifdef CONFIG_SYSCTL
|
|
unregister_sysctl_table(nlm_sysctl_table);
|
|
err_sysctl:
|
|
#endif
|
|
return err;
|
|
}
|
|
|
|
static void __exit exit_nlm(void)
|
|
{
|
|
/* FIXME: delete all NLM clients */
|
|
nlm_shutdown_hosts();
|
|
lockd_remove_procfs();
|
|
unregister_pernet_subsys(&lockd_net_ops);
|
|
#ifdef CONFIG_SYSCTL
|
|
unregister_sysctl_table(nlm_sysctl_table);
|
|
#endif
|
|
}
|
|
|
|
module_init(init_nlm);
|
|
module_exit(exit_nlm);
|
|
|
|
/**
|
|
* nlmsvc_dispatch - Process an NLM Request
|
|
* @rqstp: incoming request
|
|
*
|
|
* Return values:
|
|
* %0: Processing complete; do not send a Reply
|
|
* %1: Processing complete; send Reply in rqstp->rq_res
|
|
*/
|
|
static int nlmsvc_dispatch(struct svc_rqst *rqstp)
|
|
{
|
|
const struct svc_procedure *procp = rqstp->rq_procinfo;
|
|
__be32 *statp = rqstp->rq_accept_statp;
|
|
|
|
if (!procp->pc_decode(rqstp, &rqstp->rq_arg_stream))
|
|
goto out_decode_err;
|
|
|
|
*statp = procp->pc_func(rqstp);
|
|
if (*statp == rpc_drop_reply)
|
|
return 0;
|
|
if (*statp != rpc_success)
|
|
return 1;
|
|
|
|
if (!procp->pc_encode(rqstp, &rqstp->rq_res_stream))
|
|
goto out_encode_err;
|
|
|
|
return 1;
|
|
|
|
out_decode_err:
|
|
*statp = rpc_garbage_args;
|
|
return 1;
|
|
|
|
out_encode_err:
|
|
*statp = rpc_system_err;
|
|
return 1;
|
|
}
|
|
|
|
/*
|
|
* Define NLM program and procedures
|
|
*/
|
|
static DEFINE_PER_CPU_ALIGNED(unsigned long, nlmsvc_version1_count[17]);
|
|
static const struct svc_version nlmsvc_version1 = {
|
|
.vs_vers = 1,
|
|
.vs_nproc = 17,
|
|
.vs_proc = nlmsvc_procedures,
|
|
.vs_count = nlmsvc_version1_count,
|
|
.vs_dispatch = nlmsvc_dispatch,
|
|
.vs_xdrsize = NLMSVC_XDRSIZE,
|
|
};
|
|
|
|
static DEFINE_PER_CPU_ALIGNED(unsigned long,
|
|
nlmsvc_version3_count[ARRAY_SIZE(nlmsvc_procedures)]);
|
|
static const struct svc_version nlmsvc_version3 = {
|
|
.vs_vers = 3,
|
|
.vs_nproc = ARRAY_SIZE(nlmsvc_procedures),
|
|
.vs_proc = nlmsvc_procedures,
|
|
.vs_count = nlmsvc_version3_count,
|
|
.vs_dispatch = nlmsvc_dispatch,
|
|
.vs_xdrsize = NLMSVC_XDRSIZE,
|
|
};
|
|
|
|
#ifdef CONFIG_LOCKD_V4
|
|
static DEFINE_PER_CPU_ALIGNED(unsigned long,
|
|
nlmsvc_version4_count[ARRAY_SIZE(nlmsvc_procedures4)]);
|
|
static const struct svc_version nlmsvc_version4 = {
|
|
.vs_vers = 4,
|
|
.vs_nproc = ARRAY_SIZE(nlmsvc_procedures4),
|
|
.vs_proc = nlmsvc_procedures4,
|
|
.vs_count = nlmsvc_version4_count,
|
|
.vs_dispatch = nlmsvc_dispatch,
|
|
.vs_xdrsize = NLMSVC_XDRSIZE,
|
|
};
|
|
#endif
|
|
|
|
static const struct svc_version *nlmsvc_version[] = {
|
|
[1] = &nlmsvc_version1,
|
|
[3] = &nlmsvc_version3,
|
|
#ifdef CONFIG_LOCKD_V4
|
|
[4] = &nlmsvc_version4,
|
|
#endif
|
|
};
|
|
|
|
static struct svc_stat nlmsvc_stats;
|
|
|
|
#define NLM_NRVERS ARRAY_SIZE(nlmsvc_version)
|
|
static struct svc_program nlmsvc_program = {
|
|
.pg_prog = NLM_PROGRAM, /* program number */
|
|
.pg_nvers = NLM_NRVERS, /* number of entries in nlmsvc_version */
|
|
.pg_vers = nlmsvc_version, /* version table */
|
|
.pg_name = "lockd", /* service name */
|
|
.pg_class = "nfsd", /* share authentication with nfsd */
|
|
.pg_stats = &nlmsvc_stats, /* stats table */
|
|
.pg_authenticate = &lockd_authenticate, /* export authentication */
|
|
.pg_init_request = svc_generic_init_request,
|
|
.pg_rpcbind_set = svc_generic_rpcbind_set,
|
|
};
|