linux/fs/lockd/svc.c
<<
>>
Prefs
   1// SPDX-License-Identifier: GPL-2.0-only
   2/*
   3 * linux/fs/lockd/svc.c
   4 *
   5 * This is the central lockd service.
   6 *
   7 * FIXME: Separate the lockd NFS server functionality from the lockd NFS
   8 *        client functionality. Oh why didn't Sun create two separate
   9 *        services in the first place?
  10 *
  11 * Authors:     Olaf Kirch (okir@monad.swb.de)
  12 *
  13 * Copyright (C) 1995, 1996 Olaf Kirch <okir@monad.swb.de>
  14 */
  15
  16#include <linux/module.h>
  17#include <linux/init.h>
  18#include <linux/sysctl.h>
  19#include <linux/moduleparam.h>
  20
  21#include <linux/sched/signal.h>
  22#include <linux/errno.h>
  23#include <linux/in.h>
  24#include <linux/uio.h>
  25#include <linux/smp.h>
  26#include <linux/mutex.h>
  27#include <linux/kthread.h>
  28#include <linux/freezer.h>
  29#include <linux/inetdevice.h>
  30
  31#include <linux/sunrpc/types.h>
  32#include <linux/sunrpc/stats.h>
  33#include <linux/sunrpc/clnt.h>
  34#include <linux/sunrpc/svc.h>
  35#include <linux/sunrpc/svcsock.h>
  36#include <linux/sunrpc/svc_xprt.h>
  37#include <net/ip.h>
  38#include <net/addrconf.h>
  39#include <net/ipv6.h>
  40#include <linux/lockd/lockd.h>
  41#include <linux/nfs.h>
  42
  43#include "netns.h"
  44#include "procfs.h"
  45
  46#define NLMDBG_FACILITY         NLMDBG_SVC
  47#define LOCKD_BUFSIZE           (1024 + NLMSVC_XDRSIZE)
  48#define ALLOWED_SIGS            (sigmask(SIGKILL))
  49
  50static struct svc_program       nlmsvc_program;
  51
  52const struct nlmsvc_binding     *nlmsvc_ops;
  53EXPORT_SYMBOL_GPL(nlmsvc_ops);
  54
  55static DEFINE_MUTEX(nlmsvc_mutex);
  56static unsigned int             nlmsvc_users;
  57static struct task_struct       *nlmsvc_task;
  58static struct svc_rqst          *nlmsvc_rqst;
  59unsigned long                   nlmsvc_timeout;
  60
  61static atomic_t nlm_ntf_refcnt = ATOMIC_INIT(0);
  62static DECLARE_WAIT_QUEUE_HEAD(nlm_ntf_wq);
  63
  64unsigned int lockd_net_id;
  65
  66/*
  67 * These can be set at insmod time (useful for NFS as root filesystem),
  68 * and also changed through the sysctl interface.  -- Jamie Lokier, Aug 2003
  69 */
  70static unsigned long            nlm_grace_period;
  71static unsigned long            nlm_timeout = LOCKD_DFLT_TIMEO;
  72static int                      nlm_udpport, nlm_tcpport;
  73
  74/* RLIM_NOFILE defaults to 1024. That seems like a reasonable default here. */
  75static unsigned int             nlm_max_connections = 1024;
  76
  77/*
  78 * Constants needed for the sysctl interface.
  79 */
  80static const unsigned long      nlm_grace_period_min = 0;
  81static const unsigned long      nlm_grace_period_max = 240;
  82static const unsigned long      nlm_timeout_min = 3;
  83static const unsigned long      nlm_timeout_max = 20;
  84static const int                nlm_port_min = 0, nlm_port_max = 65535;
  85
  86#ifdef CONFIG_SYSCTL
  87static struct ctl_table_header * nlm_sysctl_table;
  88#endif
  89
  90static unsigned long get_lockd_grace_period(void)
  91{
  92        /* Note: nlm_timeout should always be nonzero */
  93        if (nlm_grace_period)
  94                return roundup(nlm_grace_period, nlm_timeout) * HZ;
  95        else
  96                return nlm_timeout * 5 * HZ;
  97}
  98
  99static void grace_ender(struct work_struct *grace)
 100{
 101        struct delayed_work *dwork = to_delayed_work(grace);
 102        struct lockd_net *ln = container_of(dwork, struct lockd_net,
 103                                            grace_period_end);
 104
 105        locks_end_grace(&ln->lockd_manager);
 106}
 107
 108static void set_grace_period(struct net *net)
 109{
 110        unsigned long grace_period = get_lockd_grace_period();
 111        struct lockd_net *ln = net_generic(net, lockd_net_id);
 112
 113        locks_start_grace(net, &ln->lockd_manager);
 114        cancel_delayed_work_sync(&ln->grace_period_end);
 115        schedule_delayed_work(&ln->grace_period_end, grace_period);
 116}
 117
 118static void restart_grace(void)
 119{
 120        if (nlmsvc_ops) {
 121                struct net *net = &init_net;
 122                struct lockd_net *ln = net_generic(net, lockd_net_id);
 123
 124                cancel_delayed_work_sync(&ln->grace_period_end);
 125                locks_end_grace(&ln->lockd_manager);
 126                nlmsvc_invalidate_all();
 127                set_grace_period(net);
 128        }
 129}
 130
 131/*
 132 * This is the lockd kernel thread
 133 */
 134static int
 135lockd(void *vrqstp)
 136{
 137        int             err = 0;
 138        struct svc_rqst *rqstp = vrqstp;
 139        struct net *net = &init_net;
 140        struct lockd_net *ln = net_generic(net, lockd_net_id);
 141
 142        /* try_to_freeze() is called from svc_recv() */
 143        set_freezable();
 144
 145        /* Allow SIGKILL to tell lockd to drop all of its locks */
 146        allow_signal(SIGKILL);
 147
 148        dprintk("NFS locking service started (ver " LOCKD_VERSION ").\n");
 149
 150        /*
 151         * The main request loop. We don't terminate until the last
 152         * NFS mount or NFS daemon has gone away.
 153         */
 154        while (!kthread_should_stop()) {
 155                long timeout = MAX_SCHEDULE_TIMEOUT;
 156                RPC_IFDEBUG(char buf[RPC_MAX_ADDRBUFLEN]);
 157
 158                /* update sv_maxconn if it has changed */
 159                rqstp->rq_server->sv_maxconn = nlm_max_connections;
 160
 161                if (signalled()) {
 162                        flush_signals(current);
 163                        restart_grace();
 164                        continue;
 165                }
 166
 167                timeout = nlmsvc_retry_blocked();
 168
 169                /*
 170                 * Find a socket with data available and call its
 171                 * recvfrom routine.
 172                 */
 173                err = svc_recv(rqstp, timeout);
 174                if (err == -EAGAIN || err == -EINTR)
 175                        continue;
 176                dprintk("lockd: request from %s\n",
 177                                svc_print_addr(rqstp, buf, sizeof(buf)));
 178
 179                svc_process(rqstp);
 180        }
 181        flush_signals(current);
 182        if (nlmsvc_ops)
 183                nlmsvc_invalidate_all();
 184        nlm_shutdown_hosts();
 185        cancel_delayed_work_sync(&ln->grace_period_end);
 186        locks_end_grace(&ln->lockd_manager);
 187        return 0;
 188}
 189
 190static int create_lockd_listener(struct svc_serv *serv, const char *name,
 191                                 struct net *net, const int family,
 192                                 const unsigned short port,
 193                                 const struct cred *cred)
 194{
 195        struct svc_xprt *xprt;
 196
 197        xprt = svc_find_xprt(serv, name, net, family, 0);
 198        if (xprt == NULL)
 199                return svc_create_xprt(serv, name, net, family, port,
 200                                                SVC_SOCK_DEFAULTS, cred);
 201        svc_xprt_put(xprt);
 202        return 0;
 203}
 204
 205static int create_lockd_family(struct svc_serv *serv, struct net *net,
 206                               const int family, const struct cred *cred)
 207{
 208        int err;
 209
 210        err = create_lockd_listener(serv, "udp", net, family, nlm_udpport,
 211                        cred);
 212        if (err < 0)
 213                return err;
 214
 215        return create_lockd_listener(serv, "tcp", net, family, nlm_tcpport,
 216                        cred);
 217}
 218
 219/*
 220 * Ensure there are active UDP and TCP listeners for lockd.
 221 *
 222 * Even if we have only TCP NFS mounts and/or TCP NFSDs, some
 223 * local services (such as rpc.statd) still require UDP, and
 224 * some NFS servers do not yet support NLM over TCP.
 225 *
 226 * Returns zero if all listeners are available; otherwise a
 227 * negative errno value is returned.
 228 */
 229static int make_socks(struct svc_serv *serv, struct net *net,
 230                const struct cred *cred)
 231{
 232        static int warned;
 233        int err;
 234
 235        err = create_lockd_family(serv, net, PF_INET, cred);
 236        if (err < 0)
 237                goto out_err;
 238
 239        err = create_lockd_family(serv, net, PF_INET6, cred);
 240        if (err < 0 && err != -EAFNOSUPPORT)
 241                goto out_err;
 242
 243        warned = 0;
 244        return 0;
 245
 246out_err:
 247        if (warned++ == 0)
 248                printk(KERN_WARNING
 249                        "lockd_up: makesock failed, error=%d\n", err);
 250        svc_shutdown_net(serv, net);
 251        return err;
 252}
 253
 254static int lockd_up_net(struct svc_serv *serv, struct net *net,
 255                const struct cred *cred)
 256{
 257        struct lockd_net *ln = net_generic(net, lockd_net_id);
 258        int error;
 259
 260        if (ln->nlmsvc_users++)
 261                return 0;
 262
 263        error = svc_bind(serv, net);
 264        if (error)
 265                goto err_bind;
 266
 267        error = make_socks(serv, net, cred);
 268        if (error < 0)
 269                goto err_bind;
 270        set_grace_period(net);
 271        dprintk("%s: per-net data created; net=%x\n", __func__, net->ns.inum);
 272        return 0;
 273
 274err_bind:
 275        ln->nlmsvc_users--;
 276        return error;
 277}
 278
 279static void lockd_down_net(struct svc_serv *serv, struct net *net)
 280{
 281        struct lockd_net *ln = net_generic(net, lockd_net_id);
 282
 283        if (ln->nlmsvc_users) {
 284                if (--ln->nlmsvc_users == 0) {
 285                        nlm_shutdown_hosts_net(net);
 286                        cancel_delayed_work_sync(&ln->grace_period_end);
 287                        locks_end_grace(&ln->lockd_manager);
 288                        svc_shutdown_net(serv, net);
 289                        dprintk("%s: per-net data destroyed; net=%x\n",
 290                                __func__, net->ns.inum);
 291                }
 292        } else {
 293                pr_err("%s: no users! task=%p, net=%x\n",
 294                        __func__, nlmsvc_task, net->ns.inum);
 295                BUG();
 296        }
 297}
 298
 299static int lockd_inetaddr_event(struct notifier_block *this,
 300        unsigned long event, void *ptr)
 301{
 302        struct in_ifaddr *ifa = (struct in_ifaddr *)ptr;
 303        struct sockaddr_in sin;
 304
 305        if ((event != NETDEV_DOWN) ||
 306            !atomic_inc_not_zero(&nlm_ntf_refcnt))
 307                goto out;
 308
 309        if (nlmsvc_rqst) {
 310                dprintk("lockd_inetaddr_event: removed %pI4\n",
 311                        &ifa->ifa_local);
 312                sin.sin_family = AF_INET;
 313                sin.sin_addr.s_addr = ifa->ifa_local;
 314                svc_age_temp_xprts_now(nlmsvc_rqst->rq_server,
 315                        (struct sockaddr *)&sin);
 316        }
 317        atomic_dec(&nlm_ntf_refcnt);
 318        wake_up(&nlm_ntf_wq);
 319
 320out:
 321        return NOTIFY_DONE;
 322}
 323
 324static struct notifier_block lockd_inetaddr_notifier = {
 325        .notifier_call = lockd_inetaddr_event,
 326};
 327
 328#if IS_ENABLED(CONFIG_IPV6)
 329static int lockd_inet6addr_event(struct notifier_block *this,
 330        unsigned long event, void *ptr)
 331{
 332        struct inet6_ifaddr *ifa = (struct inet6_ifaddr *)ptr;
 333        struct sockaddr_in6 sin6;
 334
 335        if ((event != NETDEV_DOWN) ||
 336            !atomic_inc_not_zero(&nlm_ntf_refcnt))
 337                goto out;
 338
 339        if (nlmsvc_rqst) {
 340                dprintk("lockd_inet6addr_event: removed %pI6\n", &ifa->addr);
 341                sin6.sin6_family = AF_INET6;
 342                sin6.sin6_addr = ifa->addr;
 343                if (ipv6_addr_type(&sin6.sin6_addr) & IPV6_ADDR_LINKLOCAL)
 344                        sin6.sin6_scope_id = ifa->idev->dev->ifindex;
 345                svc_age_temp_xprts_now(nlmsvc_rqst->rq_server,
 346                        (struct sockaddr *)&sin6);
 347        }
 348        atomic_dec(&nlm_ntf_refcnt);
 349        wake_up(&nlm_ntf_wq);
 350
 351out:
 352        return NOTIFY_DONE;
 353}
 354
 355static struct notifier_block lockd_inet6addr_notifier = {
 356        .notifier_call = lockd_inet6addr_event,
 357};
 358#endif
 359
 360static void lockd_unregister_notifiers(void)
 361{
 362        unregister_inetaddr_notifier(&lockd_inetaddr_notifier);
 363#if IS_ENABLED(CONFIG_IPV6)
 364        unregister_inet6addr_notifier(&lockd_inet6addr_notifier);
 365#endif
 366        wait_event(nlm_ntf_wq, atomic_read(&nlm_ntf_refcnt) == 0);
 367}
 368
 369static void lockd_svc_exit_thread(void)
 370{
 371        atomic_dec(&nlm_ntf_refcnt);
 372        lockd_unregister_notifiers();
 373        svc_exit_thread(nlmsvc_rqst);
 374}
 375
 376static int lockd_start_svc(struct svc_serv *serv)
 377{
 378        int error;
 379
 380        if (nlmsvc_rqst)
 381                return 0;
 382
 383        /*
 384         * Create the kernel thread and wait for it to start.
 385         */
 386        nlmsvc_rqst = svc_prepare_thread(serv, &serv->sv_pools[0], NUMA_NO_NODE);
 387        if (IS_ERR(nlmsvc_rqst)) {
 388                error = PTR_ERR(nlmsvc_rqst);
 389                printk(KERN_WARNING
 390                        "lockd_up: svc_rqst allocation failed, error=%d\n",
 391                        error);
 392                lockd_unregister_notifiers();
 393                goto out_rqst;
 394        }
 395
 396        atomic_inc(&nlm_ntf_refcnt);
 397        svc_sock_update_bufs(serv);
 398        serv->sv_maxconn = nlm_max_connections;
 399
 400        nlmsvc_task = kthread_create(lockd, nlmsvc_rqst, "%s", serv->sv_name);
 401        if (IS_ERR(nlmsvc_task)) {
 402                error = PTR_ERR(nlmsvc_task);
 403                printk(KERN_WARNING
 404                        "lockd_up: kthread_run failed, error=%d\n", error);
 405                goto out_task;
 406        }
 407        nlmsvc_rqst->rq_task = nlmsvc_task;
 408        wake_up_process(nlmsvc_task);
 409
 410        dprintk("lockd_up: service started\n");
 411        return 0;
 412
 413out_task:
 414        lockd_svc_exit_thread();
 415        nlmsvc_task = NULL;
 416out_rqst:
 417        nlmsvc_rqst = NULL;
 418        return error;
 419}
 420
 421static const struct svc_serv_ops lockd_sv_ops = {
 422        .svo_shutdown           = svc_rpcb_cleanup,
 423        .svo_enqueue_xprt       = svc_xprt_do_enqueue,
 424};
 425
 426static struct svc_serv *lockd_create_svc(void)
 427{
 428        struct svc_serv *serv;
 429
 430        /*
 431         * Check whether we're already up and running.
 432         */
 433        if (nlmsvc_rqst) {
 434                /*
 435                 * Note: increase service usage, because later in case of error
 436                 * svc_destroy() will be called.
 437                 */
 438                svc_get(nlmsvc_rqst->rq_server);
 439                return nlmsvc_rqst->rq_server;
 440        }
 441
 442        /*
 443         * Sanity check: if there's no pid,
 444         * we should be the first user ...
 445         */
 446        if (nlmsvc_users)
 447                printk(KERN_WARNING
 448                        "lockd_up: no pid, %d users??\n", nlmsvc_users);
 449
 450        if (!nlm_timeout)
 451                nlm_timeout = LOCKD_DFLT_TIMEO;
 452        nlmsvc_timeout = nlm_timeout * HZ;
 453
 454        serv = svc_create(&nlmsvc_program, LOCKD_BUFSIZE, &lockd_sv_ops);
 455        if (!serv) {
 456                printk(KERN_WARNING "lockd_up: create service failed\n");
 457                return ERR_PTR(-ENOMEM);
 458        }
 459        register_inetaddr_notifier(&lockd_inetaddr_notifier);
 460#if IS_ENABLED(CONFIG_IPV6)
 461        register_inet6addr_notifier(&lockd_inet6addr_notifier);
 462#endif
 463        dprintk("lockd_up: service created\n");
 464        return serv;
 465}
 466
 467/*
 468 * Bring up the lockd process if it's not already up.
 469 */
 470int lockd_up(struct net *net, const struct cred *cred)
 471{
 472        struct svc_serv *serv;
 473        int error;
 474
 475        mutex_lock(&nlmsvc_mutex);
 476
 477        serv = lockd_create_svc();
 478        if (IS_ERR(serv)) {
 479                error = PTR_ERR(serv);
 480                goto err_create;
 481        }
 482
 483        error = lockd_up_net(serv, net, cred);
 484        if (error < 0) {
 485                lockd_unregister_notifiers();
 486                goto err_put;
 487        }
 488
 489        error = lockd_start_svc(serv);
 490        if (error < 0) {
 491                lockd_down_net(serv, net);
 492                goto err_put;
 493        }
 494        nlmsvc_users++;
 495        /*
 496         * Note: svc_serv structures have an initial use count of 1,
 497         * so we exit through here on both success and failure.
 498         */
 499err_put:
 500        svc_destroy(serv);
 501err_create:
 502        mutex_unlock(&nlmsvc_mutex);
 503        return error;
 504}
 505EXPORT_SYMBOL_GPL(lockd_up);
 506
 507/*
 508 * Decrement the user count and bring down lockd if we're the last.
 509 */
 510void
 511lockd_down(struct net *net)
 512{
 513        mutex_lock(&nlmsvc_mutex);
 514        lockd_down_net(nlmsvc_rqst->rq_server, net);
 515        if (nlmsvc_users) {
 516                if (--nlmsvc_users)
 517                        goto out;
 518        } else {
 519                printk(KERN_ERR "lockd_down: no users! task=%p\n",
 520                        nlmsvc_task);
 521                BUG();
 522        }
 523
 524        if (!nlmsvc_task) {
 525                printk(KERN_ERR "lockd_down: no lockd running.\n");
 526                BUG();
 527        }
 528        kthread_stop(nlmsvc_task);
 529        dprintk("lockd_down: service stopped\n");
 530        lockd_svc_exit_thread();
 531        dprintk("lockd_down: service destroyed\n");
 532        nlmsvc_task = NULL;
 533        nlmsvc_rqst = NULL;
 534out:
 535        mutex_unlock(&nlmsvc_mutex);
 536}
 537EXPORT_SYMBOL_GPL(lockd_down);
 538
 539#ifdef CONFIG_SYSCTL
 540
 541/*
 542 * Sysctl parameters (same as module parameters, different interface).
 543 */
 544
 545static struct ctl_table nlm_sysctls[] = {
 546        {
 547                .procname       = "nlm_grace_period",
 548                .data           = &nlm_grace_period,
 549                .maxlen         = sizeof(unsigned long),
 550                .mode           = 0644,
 551                .proc_handler   = proc_doulongvec_minmax,
 552                .extra1         = (unsigned long *) &nlm_grace_period_min,
 553                .extra2         = (unsigned long *) &nlm_grace_period_max,
 554        },
 555        {
 556                .procname       = "nlm_timeout",
 557                .data           = &nlm_timeout,
 558                .maxlen         = sizeof(unsigned long),
 559                .mode           = 0644,
 560                .proc_handler   = proc_doulongvec_minmax,
 561                .extra1         = (unsigned long *) &nlm_timeout_min,
 562                .extra2         = (unsigned long *) &nlm_timeout_max,
 563        },
 564        {
 565                .procname       = "nlm_udpport",
 566                .data           = &nlm_udpport,
 567                .maxlen         = sizeof(int),
 568                .mode           = 0644,
 569                .proc_handler   = proc_dointvec_minmax,
 570                .extra1         = (int *) &nlm_port_min,
 571                .extra2         = (int *) &nlm_port_max,
 572        },
 573        {
 574                .procname       = "nlm_tcpport",
 575                .data           = &nlm_tcpport,
 576                .maxlen         = sizeof(int),
 577                .mode           = 0644,
 578                .proc_handler   = proc_dointvec_minmax,
 579                .extra1         = (int *) &nlm_port_min,
 580                .extra2         = (int *) &nlm_port_max,
 581        },
 582        {
 583                .procname       = "nsm_use_hostnames",
 584                .data           = &nsm_use_hostnames,
 585                .maxlen         = sizeof(int),
 586                .mode           = 0644,
 587                .proc_handler   = proc_dobool,
 588        },
 589        {
 590                .procname       = "nsm_local_state",
 591                .data           = &nsm_local_state,
 592                .maxlen         = sizeof(int),
 593                .mode           = 0644,
 594                .proc_handler   = proc_dointvec,
 595        },
 596        { }
 597};
 598
 599static struct ctl_table nlm_sysctl_dir[] = {
 600        {
 601                .procname       = "nfs",
 602                .mode           = 0555,
 603                .child          = nlm_sysctls,
 604        },
 605        { }
 606};
 607
 608static struct ctl_table nlm_sysctl_root[] = {
 609        {
 610                .procname       = "fs",
 611                .mode           = 0555,
 612                .child          = nlm_sysctl_dir,
 613        },
 614        { }
 615};
 616
 617#endif  /* CONFIG_SYSCTL */
 618
 619/*
 620 * Module (and sysfs) parameters.
 621 */
 622
 623#define param_set_min_max(name, type, which_strtol, min, max)           \
 624static int param_set_##name(const char *val, const struct kernel_param *kp) \
 625{                                                                       \
 626        char *endp;                                                     \
 627        __typeof__(type) num = which_strtol(val, &endp, 0);             \
 628        if (endp == val || *endp || num < (min) || num > (max))         \
 629                return -EINVAL;                                         \
 630        *((type *) kp->arg) = num;                                      \
 631        return 0;                                                       \
 632}
 633
 634static inline int is_callback(u32 proc)
 635{
 636        return proc == NLMPROC_GRANTED
 637                || proc == NLMPROC_GRANTED_MSG
 638                || proc == NLMPROC_TEST_RES
 639                || proc == NLMPROC_LOCK_RES
 640                || proc == NLMPROC_CANCEL_RES
 641                || proc == NLMPROC_UNLOCK_RES
 642                || proc == NLMPROC_NSM_NOTIFY;
 643}
 644
 645
 646static int lockd_authenticate(struct svc_rqst *rqstp)
 647{
 648        rqstp->rq_client = NULL;
 649        switch (rqstp->rq_authop->flavour) {
 650                case RPC_AUTH_NULL:
 651                case RPC_AUTH_UNIX:
 652                        rqstp->rq_auth_stat = rpc_auth_ok;
 653                        if (rqstp->rq_proc == 0)
 654                                return SVC_OK;
 655                        if (is_callback(rqstp->rq_proc)) {
 656                                /* Leave it to individual procedures to
 657                                 * call nlmsvc_lookup_host(rqstp)
 658                                 */
 659                                return SVC_OK;
 660                        }
 661                        return svc_set_client(rqstp);
 662        }
 663        rqstp->rq_auth_stat = rpc_autherr_badcred;
 664        return SVC_DENIED;
 665}
 666
 667
 668param_set_min_max(port, int, simple_strtol, 0, 65535)
 669param_set_min_max(grace_period, unsigned long, simple_strtoul,
 670                  nlm_grace_period_min, nlm_grace_period_max)
 671param_set_min_max(timeout, unsigned long, simple_strtoul,
 672                  nlm_timeout_min, nlm_timeout_max)
 673
 674MODULE_AUTHOR("Olaf Kirch <okir@monad.swb.de>");
 675MODULE_DESCRIPTION("NFS file locking service version " LOCKD_VERSION ".");
 676MODULE_LICENSE("GPL");
 677
 678module_param_call(nlm_grace_period, param_set_grace_period, param_get_ulong,
 679                  &nlm_grace_period, 0644);
 680module_param_call(nlm_timeout, param_set_timeout, param_get_ulong,
 681                  &nlm_timeout, 0644);
 682module_param_call(nlm_udpport, param_set_port, param_get_int,
 683                  &nlm_udpport, 0644);
 684module_param_call(nlm_tcpport, param_set_port, param_get_int,
 685                  &nlm_tcpport, 0644);
 686module_param(nsm_use_hostnames, bool, 0644);
 687module_param(nlm_max_connections, uint, 0644);
 688
 689static int lockd_init_net(struct net *net)
 690{
 691        struct lockd_net *ln = net_generic(net, lockd_net_id);
 692
 693        INIT_DELAYED_WORK(&ln->grace_period_end, grace_ender);
 694        INIT_LIST_HEAD(&ln->lockd_manager.list);
 695        ln->lockd_manager.block_opens = false;
 696        INIT_LIST_HEAD(&ln->nsm_handles);
 697        return 0;
 698}
 699
 700static void lockd_exit_net(struct net *net)
 701{
 702        struct lockd_net *ln = net_generic(net, lockd_net_id);
 703
 704        WARN_ONCE(!list_empty(&ln->lockd_manager.list),
 705                  "net %x %s: lockd_manager.list is not empty\n",
 706                  net->ns.inum, __func__);
 707        WARN_ONCE(!list_empty(&ln->nsm_handles),
 708                  "net %x %s: nsm_handles list is not empty\n",
 709                  net->ns.inum, __func__);
 710        WARN_ONCE(delayed_work_pending(&ln->grace_period_end),
 711                  "net %x %s: grace_period_end was not cancelled\n",
 712                  net->ns.inum, __func__);
 713}
 714
 715static struct pernet_operations lockd_net_ops = {
 716        .init = lockd_init_net,
 717        .exit = lockd_exit_net,
 718        .id = &lockd_net_id,
 719        .size = sizeof(struct lockd_net),
 720};
 721
 722
 723/*
 724 * Initialising and terminating the module.
 725 */
 726
 727static int __init init_nlm(void)
 728{
 729        int err;
 730
 731#ifdef CONFIG_SYSCTL
 732        err = -ENOMEM;
 733        nlm_sysctl_table = register_sysctl_table(nlm_sysctl_root);
 734        if (nlm_sysctl_table == NULL)
 735                goto err_sysctl;
 736#endif
 737        err = register_pernet_subsys(&lockd_net_ops);
 738        if (err)
 739                goto err_pernet;
 740
 741        err = lockd_create_procfs();
 742        if (err)
 743                goto err_procfs;
 744
 745        return 0;
 746
 747err_procfs:
 748        unregister_pernet_subsys(&lockd_net_ops);
 749err_pernet:
 750#ifdef CONFIG_SYSCTL
 751        unregister_sysctl_table(nlm_sysctl_table);
 752err_sysctl:
 753#endif
 754        return err;
 755}
 756
 757static void __exit exit_nlm(void)
 758{
 759        /* FIXME: delete all NLM clients */
 760        nlm_shutdown_hosts();
 761        lockd_remove_procfs();
 762        unregister_pernet_subsys(&lockd_net_ops);
 763#ifdef CONFIG_SYSCTL
 764        unregister_sysctl_table(nlm_sysctl_table);
 765#endif
 766}
 767
 768module_init(init_nlm);
 769module_exit(exit_nlm);
 770
 771/**
 772 * nlmsvc_dispatch - Process an NLM Request
 773 * @rqstp: incoming request
 774 * @statp: pointer to location of accept_stat field in RPC Reply buffer
 775 *
 776 * Return values:
 777 *  %0: Processing complete; do not send a Reply
 778 *  %1: Processing complete; send Reply in rqstp->rq_res
 779 */
 780static int nlmsvc_dispatch(struct svc_rqst *rqstp, __be32 *statp)
 781{
 782        const struct svc_procedure *procp = rqstp->rq_procinfo;
 783        struct kvec *argv = rqstp->rq_arg.head;
 784        struct kvec *resv = rqstp->rq_res.head;
 785
 786        svcxdr_init_decode(rqstp);
 787        if (!procp->pc_decode(rqstp, argv->iov_base))
 788                goto out_decode_err;
 789
 790        *statp = procp->pc_func(rqstp);
 791        if (*statp == rpc_drop_reply)
 792                return 0;
 793        if (*statp != rpc_success)
 794                return 1;
 795
 796        svcxdr_init_encode(rqstp);
 797        if (!procp->pc_encode(rqstp, resv->iov_base + resv->iov_len))
 798                goto out_encode_err;
 799
 800        return 1;
 801
 802out_decode_err:
 803        *statp = rpc_garbage_args;
 804        return 1;
 805
 806out_encode_err:
 807        *statp = rpc_system_err;
 808        return 1;
 809}
 810
 811/*
 812 * Define NLM program and procedures
 813 */
 814static unsigned int nlmsvc_version1_count[17];
 815static const struct svc_version nlmsvc_version1 = {
 816        .vs_vers        = 1,
 817        .vs_nproc       = 17,
 818        .vs_proc        = nlmsvc_procedures,
 819        .vs_count       = nlmsvc_version1_count,
 820        .vs_dispatch    = nlmsvc_dispatch,
 821        .vs_xdrsize     = NLMSVC_XDRSIZE,
 822};
 823static unsigned int nlmsvc_version3_count[24];
 824static const struct svc_version nlmsvc_version3 = {
 825        .vs_vers        = 3,
 826        .vs_nproc       = 24,
 827        .vs_proc        = nlmsvc_procedures,
 828        .vs_count       = nlmsvc_version3_count,
 829        .vs_dispatch    = nlmsvc_dispatch,
 830        .vs_xdrsize     = NLMSVC_XDRSIZE,
 831};
 832#ifdef CONFIG_LOCKD_V4
 833static unsigned int nlmsvc_version4_count[24];
 834static const struct svc_version nlmsvc_version4 = {
 835        .vs_vers        = 4,
 836        .vs_nproc       = 24,
 837        .vs_proc        = nlmsvc_procedures4,
 838        .vs_count       = nlmsvc_version4_count,
 839        .vs_dispatch    = nlmsvc_dispatch,
 840        .vs_xdrsize     = NLMSVC_XDRSIZE,
 841};
 842#endif
 843static const struct svc_version *nlmsvc_version[] = {
 844        [1] = &nlmsvc_version1,
 845        [3] = &nlmsvc_version3,
 846#ifdef CONFIG_LOCKD_V4
 847        [4] = &nlmsvc_version4,
 848#endif
 849};
 850
 851static struct svc_stat          nlmsvc_stats;
 852
 853#define NLM_NRVERS      ARRAY_SIZE(nlmsvc_version)
 854static struct svc_program       nlmsvc_program = {
 855        .pg_prog                = NLM_PROGRAM,          /* program number */
 856        .pg_nvers               = NLM_NRVERS,           /* number of entries in nlmsvc_version */
 857        .pg_vers                = nlmsvc_version,       /* version table */
 858        .pg_name                = "lockd",              /* service name */
 859        .pg_class               = "nfsd",               /* share authentication with nfsd */
 860        .pg_stats               = &nlmsvc_stats,        /* stats table */
 861        .pg_authenticate        = &lockd_authenticate,  /* export authentication */
 862        .pg_init_request        = svc_generic_init_request,
 863        .pg_rpcbind_set         = svc_generic_rpcbind_set,
 864};
 865