/* * linux/fs/lockd/svc.c * * This is the central lockd service. * * FIXME: Separate the lockd NFS server functionality from the lockd NFS * client functionality. Oh why didn't Sun create two separate * services in the first place? * * Authors: Olaf Kirch (okir@monad.swb.de) * * Copyright (C) 1995, 1996 Olaf Kirch <okir@monad.swb.de> */ #include <linux/module.h> #include <linux/init.h> #include <linux/sysctl.h> #include <linux/moduleparam.h> #include <linux/sched.h> #include <linux/errno.h> #include <linux/in.h> #include <linux/uio.h> #include <linux/slab.h> #include <linux/smp.h> #include <linux/smp_lock.h> #include <linux/mutex.h> #include <linux/kthread.h> #include <linux/freezer.h> #include <linux/sunrpc/types.h> #include <linux/sunrpc/stats.h> #include <linux/sunrpc/clnt.h> #include <linux/sunrpc/svc.h> #include <linux/sunrpc/svcsock.h> #include <net/ip.h> #include <linux/lockd/lockd.h> #include <linux/nfs.h> #define NLMDBG_FACILITY NLMDBG_SVC #define LOCKD_BUFSIZE (1024 + NLMSVC_XDRSIZE) #define ALLOWED_SIGS (sigmask(SIGKILL)) static struct svc_program nlmsvc_program; struct nlmsvc_binding * nlmsvc_ops; EXPORT_SYMBOL_GPL(nlmsvc_ops); static DEFINE_MUTEX(nlmsvc_mutex); static unsigned int nlmsvc_users; static struct task_struct *nlmsvc_task; static struct svc_rqst *nlmsvc_rqst; unsigned long nlmsvc_timeout; /* * These can be set at insmod time (useful for NFS as root filesystem), * and also changed through the sysctl interface. -- Jamie Lokier, Aug 2003 */ static unsigned long nlm_grace_period; static unsigned long nlm_timeout = LOCKD_DFLT_TIMEO; static int nlm_udpport, nlm_tcpport; /* RLIM_NOFILE defaults to 1024. That seems like a reasonable default here. */ static unsigned int nlm_max_connections = 1024; /* * Constants needed for the sysctl interface. */ static const unsigned long nlm_grace_period_min = 0; static const unsigned long nlm_grace_period_max = 240; static const unsigned long nlm_timeout_min = 3; static const unsigned long nlm_timeout_max = 20; static const int nlm_port_min = 0, nlm_port_max = 65535; #ifdef CONFIG_SYSCTL static struct ctl_table_header * nlm_sysctl_table; #endif static unsigned long get_lockd_grace_period(void) { /* Note: nlm_timeout should always be nonzero */ if (nlm_grace_period) return roundup(nlm_grace_period, nlm_timeout) * HZ; else return nlm_timeout * 5 * HZ; } static struct lock_manager lockd_manager = { }; static void grace_ender(struct work_struct *not_used) { locks_end_grace(&lockd_manager); } static DECLARE_DELAYED_WORK(grace_period_end, grace_ender); static void set_grace_period(void) { unsigned long grace_period = get_lockd_grace_period(); locks_start_grace(&lockd_manager); cancel_delayed_work_sync(&grace_period_end); schedule_delayed_work(&grace_period_end, grace_period); } static void restart_grace(void) { if (nlmsvc_ops) { cancel_delayed_work_sync(&grace_period_end); locks_end_grace(&lockd_manager); nlmsvc_invalidate_all(); set_grace_period(); } } /* * This is the lockd kernel thread */ static int lockd(void *vrqstp) { int err = 0, preverr = 0; struct svc_rqst *rqstp = vrqstp; /* try_to_freeze() is called from svc_recv() */ set_freezable(); /* Allow SIGKILL to tell lockd to drop all of its locks */ allow_signal(SIGKILL); dprintk("NFS locking service started (ver " LOCKD_VERSION ").\n"); /* * FIXME: it would be nice if lockd didn't spend its entire life * running under the BKL. At the very least, it would be good to * have someone clarify what it's intended to protect here. I've * seen some handwavy posts about posix locking needing to be * done under the BKL, but it's far from clear. */ lock_kernel(); if (!nlm_timeout) nlm_timeout = LOCKD_DFLT_TIMEO; nlmsvc_timeout = nlm_timeout * HZ; set_grace_period(); /* * The main request loop. We don't terminate until the last * NFS mount or NFS daemon has gone away. */ while (!kthread_should_stop()) { long timeout = MAX_SCHEDULE_TIMEOUT; RPC_IFDEBUG(char buf[RPC_MAX_ADDRBUFLEN]); /* update sv_maxconn if it has changed */ rqstp->rq_server->sv_maxconn = nlm_max_connections; if (signalled()) { flush_signals(current); restart_grace(); continue; } timeout = nlmsvc_retry_blocked(); /* * Find a socket with data available and call its * recvfrom routine. */ err = svc_recv(rqstp, timeout); if (err == -EAGAIN || err == -EINTR) { preverr = err; continue; } if (err < 0) { if (err != preverr) { printk(KERN_WARNING "%s: unexpected error " "from svc_recv (%d)\n", __func__, err); preverr = err; } schedule_timeout_interruptible(HZ); continue; } preverr = err; dprintk("lockd: request from %s\n", svc_print_addr(rqstp, buf, sizeof(buf))); svc_process(rqstp); } flush_signals(current); cancel_delayed_work_sync(&grace_period_end); locks_end_grace(&lockd_manager); if (nlmsvc_ops) nlmsvc_invalidate_all(); nlm_shutdown_hosts(); unlock_kernel(); return 0; } static int create_lockd_listener(struct svc_serv *serv, const char *name, const int family, const unsigned short port) { struct svc_xprt *xprt; xprt = svc_find_xprt(serv, name, family, 0); if (xprt == NULL) return svc_create_xprt(serv, name, family, port, SVC_SOCK_DEFAULTS); svc_xprt_put(xprt); return 0; } static int create_lockd_family(struct svc_serv *serv, const int family) { int err; err = create_lockd_listener(serv, "udp", family, nlm_udpport); if (err < 0) return err; return create_lockd_listener(serv, "tcp", family, nlm_tcpport); } /* * Ensure there are active UDP and TCP listeners for lockd. * * Even if we have only TCP NFS mounts and/or TCP NFSDs, some * local services (such as rpc.statd) still require UDP, and * some NFS servers do not yet support NLM over TCP. * * Returns zero if all listeners are available; otherwise a * negative errno value is returned. */ static int make_socks(struct svc_serv *serv) { static int warned; int err; err = create_lockd_family(serv, PF_INET); if (err < 0) goto out_err; #if defined(CONFIG_IPV6) || defined(CONFIG_IPV6_MODULE) err = create_lockd_family(serv, PF_INET6); if (err < 0 && err != -EAFNOSUPPORT) goto out_err; #endif /* CONFIG_IPV6 || CONFIG_IPV6_MODULE */ warned = 0; return 0; out_err: if (warned++ == 0) printk(KERN_WARNING "lockd_up: makesock failed, error=%d\n", err); return err; } /* * Bring up the lockd process if it's not already up. */ int lockd_up(void) { struct svc_serv *serv; int error = 0; mutex_lock(&nlmsvc_mutex); /* * Check whether we're already up and running. */ if (nlmsvc_rqst) goto out; /* * Sanity check: if there's no pid, * we should be the first user ... */ if (nlmsvc_users) printk(KERN_WARNING "lockd_up: no pid, %d users??\n", nlmsvc_users); error = -ENOMEM; serv = svc_create(&nlmsvc_program, LOCKD_BUFSIZE, NULL); if (!serv) { printk(KERN_WARNING "lockd_up: create service failed\n"); goto out; } error = make_socks(serv); if (error < 0) goto destroy_and_out; /* * Create the kernel thread and wait for it to start. */ nlmsvc_rqst = svc_prepare_thread(serv, &serv->sv_pools[0]); if (IS_ERR(nlmsvc_rqst)) { error = PTR_ERR(nlmsvc_rqst); nlmsvc_rqst = NULL; printk(KERN_WARNING "lockd_up: svc_rqst allocation failed, error=%d\n", error); goto destroy_and_out; } svc_sock_update_bufs(serv); serv->sv_maxconn = nlm_max_connections; nlmsvc_task = kthread_run(lockd, nlmsvc_rqst, serv->sv_name); if (IS_ERR(nlmsvc_task)) { error = PTR_ERR(nlmsvc_task); svc_exit_thread(nlmsvc_rqst); nlmsvc_task = NULL; nlmsvc_rqst = NULL; printk(KERN_WARNING "lockd_up: kthread_run failed, error=%d\n", error); goto destroy_and_out; } /* * Note: svc_serv structures have an initial use count of 1, * so we exit through here on both success and failure. */ destroy_and_out: svc_destroy(serv); out: if (!error) nlmsvc_users++; mutex_unlock(&nlmsvc_mutex); return error; } EXPORT_SYMBOL_GPL(lockd_up); /* * Decrement the user count and bring down lockd if we're the last. */ void lockd_down(void) { mutex_lock(&nlmsvc_mutex); if (nlmsvc_users) { if (--nlmsvc_users) goto out; } else { printk(KERN_ERR "lockd_down: no users! task=%p\n", nlmsvc_task); BUG(); } if (!nlmsvc_task) { printk(KERN_ERR "lockd_down: no lockd running.\n"); BUG(); } kthread_stop(nlmsvc_task); svc_exit_thread(nlmsvc_rqst); nlmsvc_task = NULL; nlmsvc_rqst = NULL; out: mutex_unlock(&nlmsvc_mutex); } EXPORT_SYMBOL_GPL(lockd_down); #ifdef CONFIG_SYSCTL /* * Sysctl parameters (same as module parameters, different interface). */ static ctl_table nlm_sysctls[] = { { .ctl_name = CTL_UNNUMBERED, .procname = "nlm_grace_period", .data = &nlm_grace_period, .maxlen = sizeof(unsigned long), .mode = 0644, .proc_handler = &proc_doulongvec_minmax, .extra1 = (unsigned long *) &nlm_grace_period_min, .extra2 = (unsigned long *) &nlm_grace_period_max, }, { .ctl_name = CTL_UNNUMBERED, .procname = "nlm_timeout", .data = &nlm_timeout, .maxlen = sizeof(unsigned long), .mode = 0644, .proc_handler = &proc_doulongvec_minmax, .extra1 = (unsigned long *) &nlm_timeout_min, .extra2 = (unsigned long *) &nlm_timeout_max, }, { .ctl_name = CTL_UNNUMBERED, .procname = "nlm_udpport", .data = &nlm_udpport, .maxlen = sizeof(int), .mode = 0644, .proc_handler = &proc_dointvec_minmax, .extra1 = (int *) &nlm_port_min, .extra2 = (int *) &nlm_port_max, }, { .ctl_name = CTL_UNNUMBERED, .procname = "nlm_tcpport", .data = &nlm_tcpport, .maxlen = sizeof(int), .mode = 0644, .proc_handler = &proc_dointvec_minmax, .extra1 = (int *) &nlm_port_min, .extra2 = (int *) &nlm_port_max, }, { .ctl_name = CTL_UNNUMBERED, .procname = "nsm_use_hostnames", .data = &nsm_use_hostnames, .maxlen = sizeof(int), .mode = 0644, .proc_handler = &proc_dointvec, }, { .ctl_name = CTL_UNNUMBERED, .procname = "nsm_local_state", .data = &nsm_local_state, .maxlen = sizeof(int), .mode = 0644, .proc_handler = &proc_dointvec, }, { .ctl_name = 0 } }; static ctl_table nlm_sysctl_dir[] = { { .ctl_name = CTL_UNNUMBERED, .procname = "nfs", .mode = 0555, .child = nlm_sysctls, }, { .ctl_name = 0 } }; static ctl_table nlm_sysctl_root[] = { { .ctl_name = CTL_FS, .procname = "fs", .mode = 0555, .child = nlm_sysctl_dir, }, { .ctl_name = 0 } }; #endif /* CONFIG_SYSCTL */ /* * Module (and sysfs) parameters. */ #define param_set_min_max(name, type, which_strtol, min, max) \ static int param_set_##name(const char *val, struct kernel_param *kp) \ { \ char *endp; \ __typeof__(type) num = which_strtol(val, &endp, 0); \ if (endp == val || *endp || num < (min) || num > (max)) \ return -EINVAL; \ *((int *) kp->arg) = num; \ return 0; \ } static inline int is_callback(u32 proc) { return proc == NLMPROC_GRANTED || proc == NLMPROC_GRANTED_MSG || proc == NLMPROC_TEST_RES || proc == NLMPROC_LOCK_RES || proc == NLMPROC_CANCEL_RES || proc == NLMPROC_UNLOCK_RES || proc == NLMPROC_NSM_NOTIFY; } static int lockd_authenticate(struct svc_rqst *rqstp) { rqstp->rq_client = NULL; switch (rqstp->rq_authop->flavour) { case RPC_AUTH_NULL: case RPC_AUTH_UNIX: 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); } 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); /* * Initialising and terminating the module. */ static int __init init_nlm(void) { #ifdef CONFIG_SYSCTL nlm_sysctl_table = register_sysctl_table(nlm_sysctl_root); return nlm_sysctl_table ? 0 : -ENOMEM; #else return 0; #endif } static void __exit exit_nlm(void) { /* FIXME: delete all NLM clients */ nlm_shutdown_hosts(); #ifdef CONFIG_SYSCTL unregister_sysctl_table(nlm_sysctl_table); #endif } module_init(init_nlm); module_exit(exit_nlm); /* * Define NLM program and procedures */ static struct svc_version nlmsvc_version1 = { .vs_vers = 1, .vs_nproc = 17, .vs_proc = nlmsvc_procedures, .vs_xdrsize = NLMSVC_XDRSIZE, }; static struct svc_version nlmsvc_version3 = { .vs_vers = 3, .vs_nproc = 24, .vs_proc = nlmsvc_procedures, .vs_xdrsize = NLMSVC_XDRSIZE, }; #ifdef CONFIG_LOCKD_V4 static struct svc_version nlmsvc_version4 = { .vs_vers = 4, .vs_nproc = 24, .vs_proc = nlmsvc_procedures4, .vs_xdrsize = NLMSVC_XDRSIZE, }; #endif static 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 */ };