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- /*
- * linux/net/sunrpc/clnt.c
- *
- * This file contains the high-level RPC interface.
- * It is modeled as a finite state machine to support both synchronous
- * and asynchronous requests.
- *
- * - RPC header generation and argument serialization.
- * - Credential refresh.
- * - TCP connect handling.
- * - Retry of operation when it is suspected the operation failed because
- * of uid squashing on the server, or when the credentials were stale
- * and need to be refreshed, or when a packet was damaged in transit.
- * This may be have to be moved to the VFS layer.
- *
- * Copyright (C) 1992,1993 Rick Sladkey <jrs@world.std.com>
- * Copyright (C) 1995,1996 Olaf Kirch <okir@monad.swb.de>
- */
- #include <linux/module.h>
- #include <linux/types.h>
- #include <linux/kallsyms.h>
- #include <linux/mm.h>
- #include <linux/namei.h>
- #include <linux/mount.h>
- #include <linux/slab.h>
- #include <linux/rcupdate.h>
- #include <linux/utsname.h>
- #include <linux/workqueue.h>
- #include <linux/in.h>
- #include <linux/in6.h>
- #include <linux/un.h>
- #include <linux/sunrpc/clnt.h>
- #include <linux/sunrpc/addr.h>
- #include <linux/sunrpc/rpc_pipe_fs.h>
- #include <linux/sunrpc/metrics.h>
- #include <linux/sunrpc/bc_xprt.h>
- #include <trace/events/sunrpc.h>
- #include "sunrpc.h"
- #include "netns.h"
- #if IS_ENABLED(CONFIG_SUNRPC_DEBUG)
- # define RPCDBG_FACILITY RPCDBG_CALL
- #endif
- #define dprint_status(t) \
- dprintk("RPC: %5u %s (status %d)\n", t->tk_pid, \
- __func__, t->tk_status)
- /*
- * All RPC clients are linked into this list
- */
- static DECLARE_WAIT_QUEUE_HEAD(destroy_wait);
- static void call_start(struct rpc_task *task);
- static void call_reserve(struct rpc_task *task);
- static void call_reserveresult(struct rpc_task *task);
- static void call_allocate(struct rpc_task *task);
- static void call_decode(struct rpc_task *task);
- static void call_bind(struct rpc_task *task);
- static void call_bind_status(struct rpc_task *task);
- static void call_transmit(struct rpc_task *task);
- #if defined(CONFIG_SUNRPC_BACKCHANNEL)
- static void call_bc_transmit(struct rpc_task *task);
- #endif /* CONFIG_SUNRPC_BACKCHANNEL */
- static void call_status(struct rpc_task *task);
- static void call_transmit_status(struct rpc_task *task);
- static void call_refresh(struct rpc_task *task);
- static void call_refreshresult(struct rpc_task *task);
- static void call_timeout(struct rpc_task *task);
- static void call_connect(struct rpc_task *task);
- static void call_connect_status(struct rpc_task *task);
- static __be32 *rpc_encode_header(struct rpc_task *task);
- static __be32 *rpc_verify_header(struct rpc_task *task);
- static int rpc_ping(struct rpc_clnt *clnt);
- static void rpc_register_client(struct rpc_clnt *clnt)
- {
- struct net *net = rpc_net_ns(clnt);
- struct sunrpc_net *sn = net_generic(net, sunrpc_net_id);
- spin_lock(&sn->rpc_client_lock);
- list_add(&clnt->cl_clients, &sn->all_clients);
- spin_unlock(&sn->rpc_client_lock);
- }
- static void rpc_unregister_client(struct rpc_clnt *clnt)
- {
- struct net *net = rpc_net_ns(clnt);
- struct sunrpc_net *sn = net_generic(net, sunrpc_net_id);
- spin_lock(&sn->rpc_client_lock);
- list_del(&clnt->cl_clients);
- spin_unlock(&sn->rpc_client_lock);
- }
- static void __rpc_clnt_remove_pipedir(struct rpc_clnt *clnt)
- {
- rpc_remove_client_dir(clnt);
- }
- static void rpc_clnt_remove_pipedir(struct rpc_clnt *clnt)
- {
- struct net *net = rpc_net_ns(clnt);
- struct super_block *pipefs_sb;
- pipefs_sb = rpc_get_sb_net(net);
- if (pipefs_sb) {
- __rpc_clnt_remove_pipedir(clnt);
- rpc_put_sb_net(net);
- }
- }
- static struct dentry *rpc_setup_pipedir_sb(struct super_block *sb,
- struct rpc_clnt *clnt)
- {
- static uint32_t clntid;
- const char *dir_name = clnt->cl_program->pipe_dir_name;
- char name[15];
- struct dentry *dir, *dentry;
- dir = rpc_d_lookup_sb(sb, dir_name);
- if (dir == NULL) {
- pr_info("RPC: pipefs directory doesn't exist: %s\n", dir_name);
- return dir;
- }
- for (;;) {
- snprintf(name, sizeof(name), "clnt%x", (unsigned int)clntid++);
- name[sizeof(name) - 1] = '\0';
- dentry = rpc_create_client_dir(dir, name, clnt);
- if (!IS_ERR(dentry))
- break;
- if (dentry == ERR_PTR(-EEXIST))
- continue;
- printk(KERN_INFO "RPC: Couldn't create pipefs entry"
- " %s/%s, error %ld\n",
- dir_name, name, PTR_ERR(dentry));
- break;
- }
- dput(dir);
- return dentry;
- }
- static int
- rpc_setup_pipedir(struct super_block *pipefs_sb, struct rpc_clnt *clnt)
- {
- struct dentry *dentry;
- if (clnt->cl_program->pipe_dir_name != NULL) {
- dentry = rpc_setup_pipedir_sb(pipefs_sb, clnt);
- if (IS_ERR(dentry))
- return PTR_ERR(dentry);
- }
- return 0;
- }
- static int rpc_clnt_skip_event(struct rpc_clnt *clnt, unsigned long event)
- {
- if (clnt->cl_program->pipe_dir_name == NULL)
- return 1;
- switch (event) {
- case RPC_PIPEFS_MOUNT:
- if (clnt->cl_pipedir_objects.pdh_dentry != NULL)
- return 1;
- if (atomic_read(&clnt->cl_count) == 0)
- return 1;
- break;
- case RPC_PIPEFS_UMOUNT:
- if (clnt->cl_pipedir_objects.pdh_dentry == NULL)
- return 1;
- break;
- }
- return 0;
- }
- static int __rpc_clnt_handle_event(struct rpc_clnt *clnt, unsigned long event,
- struct super_block *sb)
- {
- struct dentry *dentry;
- switch (event) {
- case RPC_PIPEFS_MOUNT:
- dentry = rpc_setup_pipedir_sb(sb, clnt);
- if (!dentry)
- return -ENOENT;
- if (IS_ERR(dentry))
- return PTR_ERR(dentry);
- break;
- case RPC_PIPEFS_UMOUNT:
- __rpc_clnt_remove_pipedir(clnt);
- break;
- default:
- printk(KERN_ERR "%s: unknown event: %ld\n", __func__, event);
- return -ENOTSUPP;
- }
- return 0;
- }
- static int __rpc_pipefs_event(struct rpc_clnt *clnt, unsigned long event,
- struct super_block *sb)
- {
- int error = 0;
- for (;; clnt = clnt->cl_parent) {
- if (!rpc_clnt_skip_event(clnt, event))
- error = __rpc_clnt_handle_event(clnt, event, sb);
- if (error || clnt == clnt->cl_parent)
- break;
- }
- return error;
- }
- static struct rpc_clnt *rpc_get_client_for_event(struct net *net, int event)
- {
- struct sunrpc_net *sn = net_generic(net, sunrpc_net_id);
- struct rpc_clnt *clnt;
- spin_lock(&sn->rpc_client_lock);
- list_for_each_entry(clnt, &sn->all_clients, cl_clients) {
- if (rpc_clnt_skip_event(clnt, event))
- continue;
- spin_unlock(&sn->rpc_client_lock);
- return clnt;
- }
- spin_unlock(&sn->rpc_client_lock);
- return NULL;
- }
- static int rpc_pipefs_event(struct notifier_block *nb, unsigned long event,
- void *ptr)
- {
- struct super_block *sb = ptr;
- struct rpc_clnt *clnt;
- int error = 0;
- while ((clnt = rpc_get_client_for_event(sb->s_fs_info, event))) {
- error = __rpc_pipefs_event(clnt, event, sb);
- if (error)
- break;
- }
- return error;
- }
- static struct notifier_block rpc_clients_block = {
- .notifier_call = rpc_pipefs_event,
- .priority = SUNRPC_PIPEFS_RPC_PRIO,
- };
- int rpc_clients_notifier_register(void)
- {
- return rpc_pipefs_notifier_register(&rpc_clients_block);
- }
- void rpc_clients_notifier_unregister(void)
- {
- return rpc_pipefs_notifier_unregister(&rpc_clients_block);
- }
- static struct rpc_xprt *rpc_clnt_set_transport(struct rpc_clnt *clnt,
- struct rpc_xprt *xprt,
- const struct rpc_timeout *timeout)
- {
- struct rpc_xprt *old;
- spin_lock(&clnt->cl_lock);
- old = rcu_dereference_protected(clnt->cl_xprt,
- lockdep_is_held(&clnt->cl_lock));
- if (!xprt_bound(xprt))
- clnt->cl_autobind = 1;
- clnt->cl_timeout = timeout;
- rcu_assign_pointer(clnt->cl_xprt, xprt);
- spin_unlock(&clnt->cl_lock);
- return old;
- }
- static void rpc_clnt_set_nodename(struct rpc_clnt *clnt, const char *nodename)
- {
- clnt->cl_nodelen = strlcpy(clnt->cl_nodename,
- nodename, sizeof(clnt->cl_nodename));
- }
- static int rpc_client_register(struct rpc_clnt *clnt,
- rpc_authflavor_t pseudoflavor,
- const char *client_name)
- {
- struct rpc_auth_create_args auth_args = {
- .pseudoflavor = pseudoflavor,
- .target_name = client_name,
- };
- struct rpc_auth *auth;
- struct net *net = rpc_net_ns(clnt);
- struct super_block *pipefs_sb;
- int err;
- rpc_clnt_debugfs_register(clnt);
- pipefs_sb = rpc_get_sb_net(net);
- if (pipefs_sb) {
- err = rpc_setup_pipedir(pipefs_sb, clnt);
- if (err)
- goto out;
- }
- rpc_register_client(clnt);
- if (pipefs_sb)
- rpc_put_sb_net(net);
- auth = rpcauth_create(&auth_args, clnt);
- if (IS_ERR(auth)) {
- dprintk("RPC: Couldn't create auth handle (flavor %u)\n",
- pseudoflavor);
- err = PTR_ERR(auth);
- goto err_auth;
- }
- return 0;
- err_auth:
- pipefs_sb = rpc_get_sb_net(net);
- rpc_unregister_client(clnt);
- __rpc_clnt_remove_pipedir(clnt);
- out:
- if (pipefs_sb)
- rpc_put_sb_net(net);
- rpc_clnt_debugfs_unregister(clnt);
- return err;
- }
- static DEFINE_IDA(rpc_clids);
- void rpc_cleanup_clids(void)
- {
- ida_destroy(&rpc_clids);
- }
- static int rpc_alloc_clid(struct rpc_clnt *clnt)
- {
- int clid;
- clid = ida_simple_get(&rpc_clids, 0, 0, GFP_KERNEL);
- if (clid < 0)
- return clid;
- clnt->cl_clid = clid;
- return 0;
- }
- static void rpc_free_clid(struct rpc_clnt *clnt)
- {
- ida_simple_remove(&rpc_clids, clnt->cl_clid);
- }
- static struct rpc_clnt * rpc_new_client(const struct rpc_create_args *args,
- struct rpc_xprt_switch *xps,
- struct rpc_xprt *xprt,
- struct rpc_clnt *parent)
- {
- const struct rpc_program *program = args->program;
- const struct rpc_version *version;
- struct rpc_clnt *clnt = NULL;
- const struct rpc_timeout *timeout;
- const char *nodename = args->nodename;
- int err;
- /* sanity check the name before trying to print it */
- dprintk("RPC: creating %s client for %s (xprt %p)\n",
- program->name, args->servername, xprt);
- err = rpciod_up();
- if (err)
- goto out_no_rpciod;
- err = -EINVAL;
- if (args->version >= program->nrvers)
- goto out_err;
- version = program->version[args->version];
- if (version == NULL)
- goto out_err;
- err = -ENOMEM;
- clnt = kzalloc(sizeof(*clnt), GFP_KERNEL);
- if (!clnt)
- goto out_err;
- clnt->cl_parent = parent ? : clnt;
- err = rpc_alloc_clid(clnt);
- if (err)
- goto out_no_clid;
- clnt->cl_procinfo = version->procs;
- clnt->cl_maxproc = version->nrprocs;
- clnt->cl_prog = args->prognumber ? : program->number;
- clnt->cl_vers = version->number;
- clnt->cl_stats = program->stats;
- clnt->cl_metrics = rpc_alloc_iostats(clnt);
- rpc_init_pipe_dir_head(&clnt->cl_pipedir_objects);
- err = -ENOMEM;
- if (clnt->cl_metrics == NULL)
- goto out_no_stats;
- clnt->cl_program = program;
- INIT_LIST_HEAD(&clnt->cl_tasks);
- spin_lock_init(&clnt->cl_lock);
- timeout = xprt->timeout;
- if (args->timeout != NULL) {
- memcpy(&clnt->cl_timeout_default, args->timeout,
- sizeof(clnt->cl_timeout_default));
- timeout = &clnt->cl_timeout_default;
- }
- rpc_clnt_set_transport(clnt, xprt, timeout);
- xprt_iter_init(&clnt->cl_xpi, xps);
- xprt_switch_put(xps);
- clnt->cl_rtt = &clnt->cl_rtt_default;
- rpc_init_rtt(&clnt->cl_rtt_default, clnt->cl_timeout->to_initval);
- atomic_set(&clnt->cl_count, 1);
- if (nodename == NULL)
- nodename = utsname()->nodename;
- /* save the nodename */
- rpc_clnt_set_nodename(clnt, nodename);
- err = rpc_client_register(clnt, args->authflavor, args->client_name);
- if (err)
- goto out_no_path;
- if (parent)
- atomic_inc(&parent->cl_count);
- return clnt;
- out_no_path:
- rpc_free_iostats(clnt->cl_metrics);
- out_no_stats:
- rpc_free_clid(clnt);
- out_no_clid:
- kfree(clnt);
- out_err:
- rpciod_down();
- out_no_rpciod:
- xprt_switch_put(xps);
- xprt_put(xprt);
- return ERR_PTR(err);
- }
- static struct rpc_clnt *rpc_create_xprt(struct rpc_create_args *args,
- struct rpc_xprt *xprt)
- {
- struct rpc_clnt *clnt = NULL;
- struct rpc_xprt_switch *xps;
- if (args->bc_xprt && args->bc_xprt->xpt_bc_xps) {
- WARN_ON_ONCE(!(args->protocol & XPRT_TRANSPORT_BC));
- xps = args->bc_xprt->xpt_bc_xps;
- xprt_switch_get(xps);
- } else {
- xps = xprt_switch_alloc(xprt, GFP_KERNEL);
- if (xps == NULL) {
- xprt_put(xprt);
- return ERR_PTR(-ENOMEM);
- }
- if (xprt->bc_xprt) {
- xprt_switch_get(xps);
- xprt->bc_xprt->xpt_bc_xps = xps;
- }
- }
- clnt = rpc_new_client(args, xps, xprt, NULL);
- if (IS_ERR(clnt))
- return clnt;
- if (!(args->flags & RPC_CLNT_CREATE_NOPING)) {
- int err = rpc_ping(clnt);
- if (err != 0) {
- rpc_shutdown_client(clnt);
- return ERR_PTR(err);
- }
- }
- clnt->cl_softrtry = 1;
- if (args->flags & RPC_CLNT_CREATE_HARDRTRY)
- clnt->cl_softrtry = 0;
- if (args->flags & RPC_CLNT_CREATE_AUTOBIND)
- clnt->cl_autobind = 1;
- if (args->flags & RPC_CLNT_CREATE_NO_RETRANS_TIMEOUT)
- clnt->cl_noretranstimeo = 1;
- if (args->flags & RPC_CLNT_CREATE_DISCRTRY)
- clnt->cl_discrtry = 1;
- if (!(args->flags & RPC_CLNT_CREATE_QUIET))
- clnt->cl_chatty = 1;
- return clnt;
- }
- /**
- * rpc_create - create an RPC client and transport with one call
- * @args: rpc_clnt create argument structure
- *
- * Creates and initializes an RPC transport and an RPC client.
- *
- * It can ping the server in order to determine if it is up, and to see if
- * it supports this program and version. RPC_CLNT_CREATE_NOPING disables
- * this behavior so asynchronous tasks can also use rpc_create.
- */
- struct rpc_clnt *rpc_create(struct rpc_create_args *args)
- {
- struct rpc_xprt *xprt;
- struct xprt_create xprtargs = {
- .net = args->net,
- .ident = args->protocol,
- .srcaddr = args->saddress,
- .dstaddr = args->address,
- .addrlen = args->addrsize,
- .servername = args->servername,
- .bc_xprt = args->bc_xprt,
- };
- char servername[48];
- if (args->bc_xprt) {
- WARN_ON_ONCE(!(args->protocol & XPRT_TRANSPORT_BC));
- xprt = args->bc_xprt->xpt_bc_xprt;
- if (xprt) {
- xprt_get(xprt);
- return rpc_create_xprt(args, xprt);
- }
- }
- if (args->flags & RPC_CLNT_CREATE_INFINITE_SLOTS)
- xprtargs.flags |= XPRT_CREATE_INFINITE_SLOTS;
- if (args->flags & RPC_CLNT_CREATE_NO_IDLE_TIMEOUT)
- xprtargs.flags |= XPRT_CREATE_NO_IDLE_TIMEOUT;
- /*
- * If the caller chooses not to specify a hostname, whip
- * up a string representation of the passed-in address.
- */
- if (xprtargs.servername == NULL) {
- struct sockaddr_un *sun =
- (struct sockaddr_un *)args->address;
- struct sockaddr_in *sin =
- (struct sockaddr_in *)args->address;
- struct sockaddr_in6 *sin6 =
- (struct sockaddr_in6 *)args->address;
- servername[0] = '\0';
- switch (args->address->sa_family) {
- case AF_LOCAL:
- snprintf(servername, sizeof(servername), "%s",
- sun->sun_path);
- break;
- case AF_INET:
- snprintf(servername, sizeof(servername), "%pI4",
- &sin->sin_addr.s_addr);
- break;
- case AF_INET6:
- snprintf(servername, sizeof(servername), "%pI6",
- &sin6->sin6_addr);
- break;
- default:
- /* caller wants default server name, but
- * address family isn't recognized. */
- return ERR_PTR(-EINVAL);
- }
- xprtargs.servername = servername;
- }
- xprt = xprt_create_transport(&xprtargs);
- if (IS_ERR(xprt))
- return (struct rpc_clnt *)xprt;
- /*
- * By default, kernel RPC client connects from a reserved port.
- * CAP_NET_BIND_SERVICE will not be set for unprivileged requesters,
- * but it is always enabled for rpciod, which handles the connect
- * operation.
- */
- xprt->resvport = 1;
- if (args->flags & RPC_CLNT_CREATE_NONPRIVPORT)
- xprt->resvport = 0;
- return rpc_create_xprt(args, xprt);
- }
- EXPORT_SYMBOL_GPL(rpc_create);
- /*
- * This function clones the RPC client structure. It allows us to share the
- * same transport while varying parameters such as the authentication
- * flavour.
- */
- static struct rpc_clnt *__rpc_clone_client(struct rpc_create_args *args,
- struct rpc_clnt *clnt)
- {
- struct rpc_xprt_switch *xps;
- struct rpc_xprt *xprt;
- struct rpc_clnt *new;
- int err;
- err = -ENOMEM;
- rcu_read_lock();
- xprt = xprt_get(rcu_dereference(clnt->cl_xprt));
- xps = xprt_switch_get(rcu_dereference(clnt->cl_xpi.xpi_xpswitch));
- rcu_read_unlock();
- if (xprt == NULL || xps == NULL) {
- xprt_put(xprt);
- xprt_switch_put(xps);
- goto out_err;
- }
- args->servername = xprt->servername;
- args->nodename = clnt->cl_nodename;
- new = rpc_new_client(args, xps, xprt, clnt);
- if (IS_ERR(new)) {
- err = PTR_ERR(new);
- goto out_err;
- }
- /* Turn off autobind on clones */
- new->cl_autobind = 0;
- new->cl_softrtry = clnt->cl_softrtry;
- new->cl_noretranstimeo = clnt->cl_noretranstimeo;
- new->cl_discrtry = clnt->cl_discrtry;
- new->cl_chatty = clnt->cl_chatty;
- return new;
- out_err:
- dprintk("RPC: %s: returned error %d\n", __func__, err);
- return ERR_PTR(err);
- }
- /**
- * rpc_clone_client - Clone an RPC client structure
- *
- * @clnt: RPC client whose parameters are copied
- *
- * Returns a fresh RPC client or an ERR_PTR.
- */
- struct rpc_clnt *rpc_clone_client(struct rpc_clnt *clnt)
- {
- struct rpc_create_args args = {
- .program = clnt->cl_program,
- .prognumber = clnt->cl_prog,
- .version = clnt->cl_vers,
- .authflavor = clnt->cl_auth->au_flavor,
- };
- return __rpc_clone_client(&args, clnt);
- }
- EXPORT_SYMBOL_GPL(rpc_clone_client);
- /**
- * rpc_clone_client_set_auth - Clone an RPC client structure and set its auth
- *
- * @clnt: RPC client whose parameters are copied
- * @flavor: security flavor for new client
- *
- * Returns a fresh RPC client or an ERR_PTR.
- */
- struct rpc_clnt *
- rpc_clone_client_set_auth(struct rpc_clnt *clnt, rpc_authflavor_t flavor)
- {
- struct rpc_create_args args = {
- .program = clnt->cl_program,
- .prognumber = clnt->cl_prog,
- .version = clnt->cl_vers,
- .authflavor = flavor,
- };
- return __rpc_clone_client(&args, clnt);
- }
- EXPORT_SYMBOL_GPL(rpc_clone_client_set_auth);
- /**
- * rpc_switch_client_transport: switch the RPC transport on the fly
- * @clnt: pointer to a struct rpc_clnt
- * @args: pointer to the new transport arguments
- * @timeout: pointer to the new timeout parameters
- *
- * This function allows the caller to switch the RPC transport for the
- * rpc_clnt structure 'clnt' to allow it to connect to a mirrored NFS
- * server, for instance. It assumes that the caller has ensured that
- * there are no active RPC tasks by using some form of locking.
- *
- * Returns zero if "clnt" is now using the new xprt. Otherwise a
- * negative errno is returned, and "clnt" continues to use the old
- * xprt.
- */
- int rpc_switch_client_transport(struct rpc_clnt *clnt,
- struct xprt_create *args,
- const struct rpc_timeout *timeout)
- {
- const struct rpc_timeout *old_timeo;
- rpc_authflavor_t pseudoflavor;
- struct rpc_xprt_switch *xps, *oldxps;
- struct rpc_xprt *xprt, *old;
- struct rpc_clnt *parent;
- int err;
- xprt = xprt_create_transport(args);
- if (IS_ERR(xprt)) {
- dprintk("RPC: failed to create new xprt for clnt %p\n",
- clnt);
- return PTR_ERR(xprt);
- }
- xps = xprt_switch_alloc(xprt, GFP_KERNEL);
- if (xps == NULL) {
- xprt_put(xprt);
- return -ENOMEM;
- }
- pseudoflavor = clnt->cl_auth->au_flavor;
- old_timeo = clnt->cl_timeout;
- old = rpc_clnt_set_transport(clnt, xprt, timeout);
- oldxps = xprt_iter_xchg_switch(&clnt->cl_xpi, xps);
- rpc_unregister_client(clnt);
- __rpc_clnt_remove_pipedir(clnt);
- rpc_clnt_debugfs_unregister(clnt);
- /*
- * A new transport was created. "clnt" therefore
- * becomes the root of a new cl_parent tree. clnt's
- * children, if it has any, still point to the old xprt.
- */
- parent = clnt->cl_parent;
- clnt->cl_parent = clnt;
- /*
- * The old rpc_auth cache cannot be re-used. GSS
- * contexts in particular are between a single
- * client and server.
- */
- err = rpc_client_register(clnt, pseudoflavor, NULL);
- if (err)
- goto out_revert;
- synchronize_rcu();
- if (parent != clnt)
- rpc_release_client(parent);
- xprt_switch_put(oldxps);
- xprt_put(old);
- dprintk("RPC: replaced xprt for clnt %p\n", clnt);
- return 0;
- out_revert:
- xps = xprt_iter_xchg_switch(&clnt->cl_xpi, oldxps);
- rpc_clnt_set_transport(clnt, old, old_timeo);
- clnt->cl_parent = parent;
- rpc_client_register(clnt, pseudoflavor, NULL);
- xprt_switch_put(xps);
- xprt_put(xprt);
- dprintk("RPC: failed to switch xprt for clnt %p\n", clnt);
- return err;
- }
- EXPORT_SYMBOL_GPL(rpc_switch_client_transport);
- static
- int rpc_clnt_xprt_iter_init(struct rpc_clnt *clnt, struct rpc_xprt_iter *xpi)
- {
- struct rpc_xprt_switch *xps;
- rcu_read_lock();
- xps = xprt_switch_get(rcu_dereference(clnt->cl_xpi.xpi_xpswitch));
- rcu_read_unlock();
- if (xps == NULL)
- return -EAGAIN;
- xprt_iter_init_listall(xpi, xps);
- xprt_switch_put(xps);
- return 0;
- }
- /**
- * rpc_clnt_iterate_for_each_xprt - Apply a function to all transports
- * @clnt: pointer to client
- * @fn: function to apply
- * @data: void pointer to function data
- *
- * Iterates through the list of RPC transports currently attached to the
- * client and applies the function fn(clnt, xprt, data).
- *
- * On error, the iteration stops, and the function returns the error value.
- */
- int rpc_clnt_iterate_for_each_xprt(struct rpc_clnt *clnt,
- int (*fn)(struct rpc_clnt *, struct rpc_xprt *, void *),
- void *data)
- {
- struct rpc_xprt_iter xpi;
- int ret;
- ret = rpc_clnt_xprt_iter_init(clnt, &xpi);
- if (ret)
- return ret;
- for (;;) {
- struct rpc_xprt *xprt = xprt_iter_get_next(&xpi);
- if (!xprt)
- break;
- ret = fn(clnt, xprt, data);
- xprt_put(xprt);
- if (ret < 0)
- break;
- }
- xprt_iter_destroy(&xpi);
- return ret;
- }
- EXPORT_SYMBOL_GPL(rpc_clnt_iterate_for_each_xprt);
- /*
- * Kill all tasks for the given client.
- * XXX: kill their descendants as well?
- */
- void rpc_killall_tasks(struct rpc_clnt *clnt)
- {
- struct rpc_task *rovr;
- if (list_empty(&clnt->cl_tasks))
- return;
- dprintk("RPC: killing all tasks for client %p\n", clnt);
- /*
- * Spin lock all_tasks to prevent changes...
- */
- spin_lock(&clnt->cl_lock);
- list_for_each_entry(rovr, &clnt->cl_tasks, tk_task) {
- if (!RPC_IS_ACTIVATED(rovr))
- continue;
- if (!(rovr->tk_flags & RPC_TASK_KILLED)) {
- rovr->tk_flags |= RPC_TASK_KILLED;
- rpc_exit(rovr, -EIO);
- if (RPC_IS_QUEUED(rovr))
- rpc_wake_up_queued_task(rovr->tk_waitqueue,
- rovr);
- }
- }
- spin_unlock(&clnt->cl_lock);
- }
- EXPORT_SYMBOL_GPL(rpc_killall_tasks);
- /*
- * Properly shut down an RPC client, terminating all outstanding
- * requests.
- */
- void rpc_shutdown_client(struct rpc_clnt *clnt)
- {
- might_sleep();
- dprintk_rcu("RPC: shutting down %s client for %s\n",
- clnt->cl_program->name,
- rcu_dereference(clnt->cl_xprt)->servername);
- while (!list_empty(&clnt->cl_tasks)) {
- rpc_killall_tasks(clnt);
- wait_event_timeout(destroy_wait,
- list_empty(&clnt->cl_tasks), 1*HZ);
- }
- rpc_release_client(clnt);
- }
- EXPORT_SYMBOL_GPL(rpc_shutdown_client);
- /*
- * Free an RPC client
- */
- static struct rpc_clnt *
- rpc_free_client(struct rpc_clnt *clnt)
- {
- struct rpc_clnt *parent = NULL;
- dprintk_rcu("RPC: destroying %s client for %s\n",
- clnt->cl_program->name,
- rcu_dereference(clnt->cl_xprt)->servername);
- if (clnt->cl_parent != clnt)
- parent = clnt->cl_parent;
- rpc_clnt_debugfs_unregister(clnt);
- rpc_clnt_remove_pipedir(clnt);
- rpc_unregister_client(clnt);
- rpc_free_iostats(clnt->cl_metrics);
- clnt->cl_metrics = NULL;
- xprt_put(rcu_dereference_raw(clnt->cl_xprt));
- xprt_iter_destroy(&clnt->cl_xpi);
- rpciod_down();
- rpc_free_clid(clnt);
- kfree(clnt);
- return parent;
- }
- /*
- * Free an RPC client
- */
- static struct rpc_clnt *
- rpc_free_auth(struct rpc_clnt *clnt)
- {
- if (clnt->cl_auth == NULL)
- return rpc_free_client(clnt);
- /*
- * Note: RPCSEC_GSS may need to send NULL RPC calls in order to
- * release remaining GSS contexts. This mechanism ensures
- * that it can do so safely.
- */
- atomic_inc(&clnt->cl_count);
- rpcauth_release(clnt->cl_auth);
- clnt->cl_auth = NULL;
- if (atomic_dec_and_test(&clnt->cl_count))
- return rpc_free_client(clnt);
- return NULL;
- }
- /*
- * Release reference to the RPC client
- */
- void
- rpc_release_client(struct rpc_clnt *clnt)
- {
- dprintk("RPC: rpc_release_client(%p)\n", clnt);
- do {
- if (list_empty(&clnt->cl_tasks))
- wake_up(&destroy_wait);
- if (!atomic_dec_and_test(&clnt->cl_count))
- break;
- clnt = rpc_free_auth(clnt);
- } while (clnt != NULL);
- }
- EXPORT_SYMBOL_GPL(rpc_release_client);
- /**
- * rpc_bind_new_program - bind a new RPC program to an existing client
- * @old: old rpc_client
- * @program: rpc program to set
- * @vers: rpc program version
- *
- * Clones the rpc client and sets up a new RPC program. This is mainly
- * of use for enabling different RPC programs to share the same transport.
- * The Sun NFSv2/v3 ACL protocol can do this.
- */
- struct rpc_clnt *rpc_bind_new_program(struct rpc_clnt *old,
- const struct rpc_program *program,
- u32 vers)
- {
- struct rpc_create_args args = {
- .program = program,
- .prognumber = program->number,
- .version = vers,
- .authflavor = old->cl_auth->au_flavor,
- };
- struct rpc_clnt *clnt;
- int err;
- clnt = __rpc_clone_client(&args, old);
- if (IS_ERR(clnt))
- goto out;
- err = rpc_ping(clnt);
- if (err != 0) {
- rpc_shutdown_client(clnt);
- clnt = ERR_PTR(err);
- }
- out:
- return clnt;
- }
- EXPORT_SYMBOL_GPL(rpc_bind_new_program);
- void rpc_task_release_transport(struct rpc_task *task)
- {
- struct rpc_xprt *xprt = task->tk_xprt;
- if (xprt) {
- task->tk_xprt = NULL;
- xprt_put(xprt);
- }
- }
- EXPORT_SYMBOL_GPL(rpc_task_release_transport);
- void rpc_task_release_client(struct rpc_task *task)
- {
- struct rpc_clnt *clnt = task->tk_client;
- if (clnt != NULL) {
- /* Remove from client task list */
- spin_lock(&clnt->cl_lock);
- list_del(&task->tk_task);
- spin_unlock(&clnt->cl_lock);
- task->tk_client = NULL;
- rpc_release_client(clnt);
- }
- rpc_task_release_transport(task);
- }
- static
- void rpc_task_set_transport(struct rpc_task *task, struct rpc_clnt *clnt)
- {
- if (!task->tk_xprt)
- task->tk_xprt = xprt_iter_get_next(&clnt->cl_xpi);
- }
- static
- void rpc_task_set_client(struct rpc_task *task, struct rpc_clnt *clnt)
- {
- if (clnt != NULL) {
- rpc_task_set_transport(task, clnt);
- task->tk_client = clnt;
- atomic_inc(&clnt->cl_count);
- if (clnt->cl_softrtry)
- task->tk_flags |= RPC_TASK_SOFT;
- if (clnt->cl_noretranstimeo)
- task->tk_flags |= RPC_TASK_NO_RETRANS_TIMEOUT;
- if (atomic_read(&clnt->cl_swapper))
- task->tk_flags |= RPC_TASK_SWAPPER;
- /* Add to the client's list of all tasks */
- spin_lock(&clnt->cl_lock);
- list_add_tail(&task->tk_task, &clnt->cl_tasks);
- spin_unlock(&clnt->cl_lock);
- }
- }
- static void
- rpc_task_set_rpc_message(struct rpc_task *task, const struct rpc_message *msg)
- {
- if (msg != NULL) {
- task->tk_msg.rpc_proc = msg->rpc_proc;
- task->tk_msg.rpc_argp = msg->rpc_argp;
- task->tk_msg.rpc_resp = msg->rpc_resp;
- if (msg->rpc_cred != NULL)
- task->tk_msg.rpc_cred = get_rpccred(msg->rpc_cred);
- }
- }
- /*
- * Default callback for async RPC calls
- */
- static void
- rpc_default_callback(struct rpc_task *task, void *data)
- {
- }
- static const struct rpc_call_ops rpc_default_ops = {
- .rpc_call_done = rpc_default_callback,
- };
- /**
- * rpc_run_task - Allocate a new RPC task, then run rpc_execute against it
- * @task_setup_data: pointer to task initialisation data
- */
- struct rpc_task *rpc_run_task(const struct rpc_task_setup *task_setup_data)
- {
- struct rpc_task *task;
- task = rpc_new_task(task_setup_data);
- rpc_task_set_client(task, task_setup_data->rpc_client);
- rpc_task_set_rpc_message(task, task_setup_data->rpc_message);
- if (task->tk_action == NULL)
- rpc_call_start(task);
- atomic_inc(&task->tk_count);
- rpc_execute(task);
- return task;
- }
- EXPORT_SYMBOL_GPL(rpc_run_task);
- /**
- * rpc_call_sync - Perform a synchronous RPC call
- * @clnt: pointer to RPC client
- * @msg: RPC call parameters
- * @flags: RPC call flags
- */
- int rpc_call_sync(struct rpc_clnt *clnt, const struct rpc_message *msg, int flags)
- {
- struct rpc_task *task;
- struct rpc_task_setup task_setup_data = {
- .rpc_client = clnt,
- .rpc_message = msg,
- .callback_ops = &rpc_default_ops,
- .flags = flags,
- };
- int status;
- WARN_ON_ONCE(flags & RPC_TASK_ASYNC);
- if (flags & RPC_TASK_ASYNC) {
- rpc_release_calldata(task_setup_data.callback_ops,
- task_setup_data.callback_data);
- return -EINVAL;
- }
- task = rpc_run_task(&task_setup_data);
- if (IS_ERR(task))
- return PTR_ERR(task);
- status = task->tk_status;
- rpc_put_task(task);
- return status;
- }
- EXPORT_SYMBOL_GPL(rpc_call_sync);
- /**
- * rpc_call_async - Perform an asynchronous RPC call
- * @clnt: pointer to RPC client
- * @msg: RPC call parameters
- * @flags: RPC call flags
- * @tk_ops: RPC call ops
- * @data: user call data
- */
- int
- rpc_call_async(struct rpc_clnt *clnt, const struct rpc_message *msg, int flags,
- const struct rpc_call_ops *tk_ops, void *data)
- {
- struct rpc_task *task;
- struct rpc_task_setup task_setup_data = {
- .rpc_client = clnt,
- .rpc_message = msg,
- .callback_ops = tk_ops,
- .callback_data = data,
- .flags = flags|RPC_TASK_ASYNC,
- };
- task = rpc_run_task(&task_setup_data);
- if (IS_ERR(task))
- return PTR_ERR(task);
- rpc_put_task(task);
- return 0;
- }
- EXPORT_SYMBOL_GPL(rpc_call_async);
- #if defined(CONFIG_SUNRPC_BACKCHANNEL)
- /**
- * rpc_run_bc_task - Allocate a new RPC task for backchannel use, then run
- * rpc_execute against it
- * @req: RPC request
- */
- struct rpc_task *rpc_run_bc_task(struct rpc_rqst *req)
- {
- struct rpc_task *task;
- struct xdr_buf *xbufp = &req->rq_snd_buf;
- struct rpc_task_setup task_setup_data = {
- .callback_ops = &rpc_default_ops,
- .flags = RPC_TASK_SOFTCONN,
- };
- dprintk("RPC: rpc_run_bc_task req= %p\n", req);
- /*
- * Create an rpc_task to send the data
- */
- task = rpc_new_task(&task_setup_data);
- task->tk_rqstp = req;
- /*
- * Set up the xdr_buf length.
- * This also indicates that the buffer is XDR encoded already.
- */
- xbufp->len = xbufp->head[0].iov_len + xbufp->page_len +
- xbufp->tail[0].iov_len;
- task->tk_action = call_bc_transmit;
- atomic_inc(&task->tk_count);
- WARN_ON_ONCE(atomic_read(&task->tk_count) != 2);
- rpc_execute(task);
- dprintk("RPC: rpc_run_bc_task: task= %p\n", task);
- return task;
- }
- #endif /* CONFIG_SUNRPC_BACKCHANNEL */
- void
- rpc_call_start(struct rpc_task *task)
- {
- task->tk_action = call_start;
- }
- EXPORT_SYMBOL_GPL(rpc_call_start);
- /**
- * rpc_peeraddr - extract remote peer address from clnt's xprt
- * @clnt: RPC client structure
- * @buf: target buffer
- * @bufsize: length of target buffer
- *
- * Returns the number of bytes that are actually in the stored address.
- */
- size_t rpc_peeraddr(struct rpc_clnt *clnt, struct sockaddr *buf, size_t bufsize)
- {
- size_t bytes;
- struct rpc_xprt *xprt;
- rcu_read_lock();
- xprt = rcu_dereference(clnt->cl_xprt);
- bytes = xprt->addrlen;
- if (bytes > bufsize)
- bytes = bufsize;
- memcpy(buf, &xprt->addr, bytes);
- rcu_read_unlock();
- return bytes;
- }
- EXPORT_SYMBOL_GPL(rpc_peeraddr);
- /**
- * rpc_peeraddr2str - return remote peer address in printable format
- * @clnt: RPC client structure
- * @format: address format
- *
- * NB: the lifetime of the memory referenced by the returned pointer is
- * the same as the rpc_xprt itself. As long as the caller uses this
- * pointer, it must hold the RCU read lock.
- */
- const char *rpc_peeraddr2str(struct rpc_clnt *clnt,
- enum rpc_display_format_t format)
- {
- struct rpc_xprt *xprt;
- xprt = rcu_dereference(clnt->cl_xprt);
- if (xprt->address_strings[format] != NULL)
- return xprt->address_strings[format];
- else
- return "unprintable";
- }
- EXPORT_SYMBOL_GPL(rpc_peeraddr2str);
- static const struct sockaddr_in rpc_inaddr_loopback = {
- .sin_family = AF_INET,
- .sin_addr.s_addr = htonl(INADDR_ANY),
- };
- static const struct sockaddr_in6 rpc_in6addr_loopback = {
- .sin6_family = AF_INET6,
- .sin6_addr = IN6ADDR_ANY_INIT,
- };
- /*
- * Try a getsockname() on a connected datagram socket. Using a
- * connected datagram socket prevents leaving a socket in TIME_WAIT.
- * This conserves the ephemeral port number space.
- *
- * Returns zero and fills in "buf" if successful; otherwise, a
- * negative errno is returned.
- */
- static int rpc_sockname(struct net *net, struct sockaddr *sap, size_t salen,
- struct sockaddr *buf)
- {
- struct socket *sock;
- int err;
- err = __sock_create(net, sap->sa_family,
- SOCK_DGRAM, IPPROTO_UDP, &sock, 1);
- if (err < 0) {
- dprintk("RPC: can't create UDP socket (%d)\n", err);
- goto out;
- }
- switch (sap->sa_family) {
- case AF_INET:
- err = kernel_bind(sock,
- (struct sockaddr *)&rpc_inaddr_loopback,
- sizeof(rpc_inaddr_loopback));
- break;
- case AF_INET6:
- err = kernel_bind(sock,
- (struct sockaddr *)&rpc_in6addr_loopback,
- sizeof(rpc_in6addr_loopback));
- break;
- default:
- err = -EAFNOSUPPORT;
- goto out;
- }
- if (err < 0) {
- dprintk("RPC: can't bind UDP socket (%d)\n", err);
- goto out_release;
- }
- err = kernel_connect(sock, sap, salen, 0);
- if (err < 0) {
- dprintk("RPC: can't connect UDP socket (%d)\n", err);
- goto out_release;
- }
- err = kernel_getsockname(sock, buf);
- if (err < 0) {
- dprintk("RPC: getsockname failed (%d)\n", err);
- goto out_release;
- }
- err = 0;
- if (buf->sa_family == AF_INET6) {
- struct sockaddr_in6 *sin6 = (struct sockaddr_in6 *)buf;
- sin6->sin6_scope_id = 0;
- }
- dprintk("RPC: %s succeeded\n", __func__);
- out_release:
- sock_release(sock);
- out:
- return err;
- }
- /*
- * Scraping a connected socket failed, so we don't have a useable
- * local address. Fallback: generate an address that will prevent
- * the server from calling us back.
- *
- * Returns zero and fills in "buf" if successful; otherwise, a
- * negative errno is returned.
- */
- static int rpc_anyaddr(int family, struct sockaddr *buf, size_t buflen)
- {
- switch (family) {
- case AF_INET:
- if (buflen < sizeof(rpc_inaddr_loopback))
- return -EINVAL;
- memcpy(buf, &rpc_inaddr_loopback,
- sizeof(rpc_inaddr_loopback));
- break;
- case AF_INET6:
- if (buflen < sizeof(rpc_in6addr_loopback))
- return -EINVAL;
- memcpy(buf, &rpc_in6addr_loopback,
- sizeof(rpc_in6addr_loopback));
- break;
- default:
- dprintk("RPC: %s: address family not supported\n",
- __func__);
- return -EAFNOSUPPORT;
- }
- dprintk("RPC: %s: succeeded\n", __func__);
- return 0;
- }
- /**
- * rpc_localaddr - discover local endpoint address for an RPC client
- * @clnt: RPC client structure
- * @buf: target buffer
- * @buflen: size of target buffer, in bytes
- *
- * Returns zero and fills in "buf" and "buflen" if successful;
- * otherwise, a negative errno is returned.
- *
- * This works even if the underlying transport is not currently connected,
- * or if the upper layer never previously provided a source address.
- *
- * The result of this function call is transient: multiple calls in
- * succession may give different results, depending on how local
- * networking configuration changes over time.
- */
- int rpc_localaddr(struct rpc_clnt *clnt, struct sockaddr *buf, size_t buflen)
- {
- struct sockaddr_storage address;
- struct sockaddr *sap = (struct sockaddr *)&address;
- struct rpc_xprt *xprt;
- struct net *net;
- size_t salen;
- int err;
- rcu_read_lock();
- xprt = rcu_dereference(clnt->cl_xprt);
- salen = xprt->addrlen;
- memcpy(sap, &xprt->addr, salen);
- net = get_net(xprt->xprt_net);
- rcu_read_unlock();
- rpc_set_port(sap, 0);
- err = rpc_sockname(net, sap, salen, buf);
- put_net(net);
- if (err != 0)
- /* Couldn't discover local address, return ANYADDR */
- return rpc_anyaddr(sap->sa_family, buf, buflen);
- return 0;
- }
- EXPORT_SYMBOL_GPL(rpc_localaddr);
- void
- rpc_setbufsize(struct rpc_clnt *clnt, unsigned int sndsize, unsigned int rcvsize)
- {
- struct rpc_xprt *xprt;
- rcu_read_lock();
- xprt = rcu_dereference(clnt->cl_xprt);
- if (xprt->ops->set_buffer_size)
- xprt->ops->set_buffer_size(xprt, sndsize, rcvsize);
- rcu_read_unlock();
- }
- EXPORT_SYMBOL_GPL(rpc_setbufsize);
- /**
- * rpc_net_ns - Get the network namespace for this RPC client
- * @clnt: RPC client to query
- *
- */
- struct net *rpc_net_ns(struct rpc_clnt *clnt)
- {
- struct net *ret;
- rcu_read_lock();
- ret = rcu_dereference(clnt->cl_xprt)->xprt_net;
- rcu_read_unlock();
- return ret;
- }
- EXPORT_SYMBOL_GPL(rpc_net_ns);
- /**
- * rpc_max_payload - Get maximum payload size for a transport, in bytes
- * @clnt: RPC client to query
- *
- * For stream transports, this is one RPC record fragment (see RFC
- * 1831), as we don't support multi-record requests yet. For datagram
- * transports, this is the size of an IP packet minus the IP, UDP, and
- * RPC header sizes.
- */
- size_t rpc_max_payload(struct rpc_clnt *clnt)
- {
- size_t ret;
- rcu_read_lock();
- ret = rcu_dereference(clnt->cl_xprt)->max_payload;
- rcu_read_unlock();
- return ret;
- }
- EXPORT_SYMBOL_GPL(rpc_max_payload);
- /**
- * rpc_max_bc_payload - Get maximum backchannel payload size, in bytes
- * @clnt: RPC client to query
- */
- size_t rpc_max_bc_payload(struct rpc_clnt *clnt)
- {
- struct rpc_xprt *xprt;
- size_t ret;
- rcu_read_lock();
- xprt = rcu_dereference(clnt->cl_xprt);
- ret = xprt->ops->bc_maxpayload(xprt);
- rcu_read_unlock();
- return ret;
- }
- EXPORT_SYMBOL_GPL(rpc_max_bc_payload);
- /**
- * rpc_force_rebind - force transport to check that remote port is unchanged
- * @clnt: client to rebind
- *
- */
- void rpc_force_rebind(struct rpc_clnt *clnt)
- {
- if (clnt->cl_autobind) {
- rcu_read_lock();
- xprt_clear_bound(rcu_dereference(clnt->cl_xprt));
- rcu_read_unlock();
- }
- }
- EXPORT_SYMBOL_GPL(rpc_force_rebind);
- /*
- * Restart an (async) RPC call from the call_prepare state.
- * Usually called from within the exit handler.
- */
- int
- rpc_restart_call_prepare(struct rpc_task *task)
- {
- if (RPC_ASSASSINATED(task))
- return 0;
- task->tk_action = call_start;
- task->tk_status = 0;
- if (task->tk_ops->rpc_call_prepare != NULL)
- task->tk_action = rpc_prepare_task;
- return 1;
- }
- EXPORT_SYMBOL_GPL(rpc_restart_call_prepare);
- /*
- * Restart an (async) RPC call. Usually called from within the
- * exit handler.
- */
- int
- rpc_restart_call(struct rpc_task *task)
- {
- if (RPC_ASSASSINATED(task))
- return 0;
- task->tk_action = call_start;
- task->tk_status = 0;
- return 1;
- }
- EXPORT_SYMBOL_GPL(rpc_restart_call);
- const char
- *rpc_proc_name(const struct rpc_task *task)
- {
- const struct rpc_procinfo *proc = task->tk_msg.rpc_proc;
- if (proc) {
- if (proc->p_name)
- return proc->p_name;
- else
- return "NULL";
- } else
- return "no proc";
- }
- /*
- * 0. Initial state
- *
- * Other FSM states can be visited zero or more times, but
- * this state is visited exactly once for each RPC.
- */
- static void
- call_start(struct rpc_task *task)
- {
- struct rpc_clnt *clnt = task->tk_client;
- int idx = task->tk_msg.rpc_proc->p_statidx;
- trace_rpc_request(task);
- dprintk("RPC: %5u call_start %s%d proc %s (%s)\n", task->tk_pid,
- clnt->cl_program->name, clnt->cl_vers,
- rpc_proc_name(task),
- (RPC_IS_ASYNC(task) ? "async" : "sync"));
- /* Increment call count (version might not be valid for ping) */
- if (clnt->cl_program->version[clnt->cl_vers])
- clnt->cl_program->version[clnt->cl_vers]->counts[idx]++;
- clnt->cl_stats->rpccnt++;
- task->tk_action = call_reserve;
- rpc_task_set_transport(task, clnt);
- }
- /*
- * 1. Reserve an RPC call slot
- */
- static void
- call_reserve(struct rpc_task *task)
- {
- dprint_status(task);
- task->tk_status = 0;
- task->tk_action = call_reserveresult;
- xprt_reserve(task);
- }
- static void call_retry_reserve(struct rpc_task *task);
- /*
- * 1b. Grok the result of xprt_reserve()
- */
- static void
- call_reserveresult(struct rpc_task *task)
- {
- int status = task->tk_status;
- dprint_status(task);
- /*
- * After a call to xprt_reserve(), we must have either
- * a request slot or else an error status.
- */
- task->tk_status = 0;
- if (status >= 0) {
- if (task->tk_rqstp) {
- task->tk_action = call_refresh;
- return;
- }
- printk(KERN_ERR "%s: status=%d, but no request slot, exiting\n",
- __func__, status);
- rpc_exit(task, -EIO);
- return;
- }
- /*
- * Even though there was an error, we may have acquired
- * a request slot somehow. Make sure not to leak it.
- */
- if (task->tk_rqstp) {
- printk(KERN_ERR "%s: status=%d, request allocated anyway\n",
- __func__, status);
- xprt_release(task);
- }
- switch (status) {
- case -ENOMEM:
- rpc_delay(task, HZ >> 2);
- /* fall through */
- case -EAGAIN: /* woken up; retry */
- task->tk_action = call_retry_reserve;
- return;
- case -EIO: /* probably a shutdown */
- break;
- default:
- printk(KERN_ERR "%s: unrecognized error %d, exiting\n",
- __func__, status);
- break;
- }
- rpc_exit(task, status);
- }
- /*
- * 1c. Retry reserving an RPC call slot
- */
- static void
- call_retry_reserve(struct rpc_task *task)
- {
- dprint_status(task);
- task->tk_status = 0;
- task->tk_action = call_reserveresult;
- xprt_retry_reserve(task);
- }
- /*
- * 2. Bind and/or refresh the credentials
- */
- static void
- call_refresh(struct rpc_task *task)
- {
- dprint_status(task);
- task->tk_action = call_refreshresult;
- task->tk_status = 0;
- task->tk_client->cl_stats->rpcauthrefresh++;
- rpcauth_refreshcred(task);
- }
- /*
- * 2a. Process the results of a credential refresh
- */
- static void
- call_refreshresult(struct rpc_task *task)
- {
- int status = task->tk_status;
- dprint_status(task);
- task->tk_status = 0;
- task->tk_action = call_refresh;
- switch (status) {
- case 0:
- if (rpcauth_uptodatecred(task)) {
- task->tk_action = call_allocate;
- return;
- }
- /* Use rate-limiting and a max number of retries if refresh
- * had status 0 but failed to update the cred.
- */
- /* fall through */
- case -ETIMEDOUT:
- rpc_delay(task, 3*HZ);
- /* fall through */
- case -EAGAIN:
- status = -EACCES;
- /* fall through */
- case -EKEYEXPIRED:
- if (!task->tk_cred_retry)
- break;
- task->tk_cred_retry--;
- dprintk("RPC: %5u %s: retry refresh creds\n",
- task->tk_pid, __func__);
- return;
- }
- dprintk("RPC: %5u %s: refresh creds failed with error %d\n",
- task->tk_pid, __func__, status);
- rpc_exit(task, status);
- }
- /*
- * 2b. Allocate the buffer. For details, see sched.c:rpc_malloc.
- * (Note: buffer memory is freed in xprt_release).
- */
- static void
- call_allocate(struct rpc_task *task)
- {
- unsigned int slack = task->tk_rqstp->rq_cred->cr_auth->au_cslack;
- struct rpc_rqst *req = task->tk_rqstp;
- struct rpc_xprt *xprt = req->rq_xprt;
- const struct rpc_procinfo *proc = task->tk_msg.rpc_proc;
- int status;
- dprint_status(task);
- task->tk_status = 0;
- task->tk_action = call_bind;
- if (req->rq_buffer)
- return;
- if (proc->p_proc != 0) {
- BUG_ON(proc->p_arglen == 0);
- if (proc->p_decode != NULL)
- BUG_ON(proc->p_replen == 0);
- }
- /*
- * Calculate the size (in quads) of the RPC call
- * and reply headers, and convert both values
- * to byte sizes.
- */
- req->rq_callsize = RPC_CALLHDRSIZE + (slack << 1) + proc->p_arglen;
- req->rq_callsize <<= 2;
- req->rq_rcvsize = RPC_REPHDRSIZE + slack + proc->p_replen;
- req->rq_rcvsize <<= 2;
- status = xprt->ops->buf_alloc(task);
- xprt_inject_disconnect(xprt);
- if (status == 0)
- return;
- if (status != -ENOMEM) {
- rpc_exit(task, status);
- return;
- }
- dprintk("RPC: %5u rpc_buffer allocation failed\n", task->tk_pid);
- if (RPC_IS_ASYNC(task) || !fatal_signal_pending(current)) {
- task->tk_action = call_allocate;
- rpc_delay(task, HZ>>4);
- return;
- }
- rpc_exit(task, -ERESTARTSYS);
- }
- static inline int
- rpc_task_need_encode(struct rpc_task *task)
- {
- return task->tk_rqstp->rq_snd_buf.len == 0;
- }
- static inline void
- rpc_task_force_reencode(struct rpc_task *task)
- {
- task->tk_rqstp->rq_snd_buf.len = 0;
- task->tk_rqstp->rq_bytes_sent = 0;
- }
- /*
- * 3. Encode arguments of an RPC call
- */
- static void
- rpc_xdr_encode(struct rpc_task *task)
- {
- struct rpc_rqst *req = task->tk_rqstp;
- kxdreproc_t encode;
- __be32 *p;
- dprint_status(task);
- xdr_buf_init(&req->rq_snd_buf,
- req->rq_buffer,
- req->rq_callsize);
- xdr_buf_init(&req->rq_rcv_buf,
- req->rq_rbuffer,
- req->rq_rcvsize);
- p = rpc_encode_header(task);
- if (p == NULL) {
- printk(KERN_INFO "RPC: couldn't encode RPC header, exit EIO\n");
- rpc_exit(task, -EIO);
- return;
- }
- encode = task->tk_msg.rpc_proc->p_encode;
- if (encode == NULL)
- return;
- task->tk_status = rpcauth_wrap_req(task, encode, req, p,
- task->tk_msg.rpc_argp);
- }
- /*
- * 4. Get the server port number if not yet set
- */
- static void
- call_bind(struct rpc_task *task)
- {
- struct rpc_xprt *xprt = task->tk_rqstp->rq_xprt;
- dprint_status(task);
- task->tk_action = call_connect;
- if (!xprt_bound(xprt)) {
- task->tk_action = call_bind_status;
- task->tk_timeout = xprt->bind_timeout;
- xprt->ops->rpcbind(task);
- }
- }
- /*
- * 4a. Sort out bind result
- */
- static void
- call_bind_status(struct rpc_task *task)
- {
- int status = -EIO;
- if (task->tk_status >= 0) {
- dprint_status(task);
- task->tk_status = 0;
- task->tk_action = call_connect;
- return;
- }
- trace_rpc_bind_status(task);
- switch (task->tk_status) {
- case -ENOMEM:
- dprintk("RPC: %5u rpcbind out of memory\n", task->tk_pid);
- rpc_delay(task, HZ >> 2);
- goto retry_timeout;
- case -EACCES:
- dprintk("RPC: %5u remote rpcbind: RPC program/version "
- "unavailable\n", task->tk_pid);
- /* fail immediately if this is an RPC ping */
- if (task->tk_msg.rpc_proc->p_proc == 0) {
- status = -EOPNOTSUPP;
- break;
- }
- if (task->tk_rebind_retry == 0)
- break;
- task->tk_rebind_retry--;
- rpc_delay(task, 3*HZ);
- goto retry_timeout;
- case -ETIMEDOUT:
- dprintk("RPC: %5u rpcbind request timed out\n",
- task->tk_pid);
- goto retry_timeout;
- case -EPFNOSUPPORT:
- /* server doesn't support any rpcbind version we know of */
- dprintk("RPC: %5u unrecognized remote rpcbind service\n",
- task->tk_pid);
- break;
- case -EPROTONOSUPPORT:
- dprintk("RPC: %5u remote rpcbind version unavailable, retrying\n",
- task->tk_pid);
- goto retry_timeout;
- case -ECONNREFUSED: /* connection problems */
- case -ECONNRESET:
- case -ECONNABORTED:
- case -ENOTCONN:
- case -EHOSTDOWN:
- case -ENETDOWN:
- case -EHOSTUNREACH:
- case -ENETUNREACH:
- case -ENOBUFS:
- case -EPIPE:
- dprintk("RPC: %5u remote rpcbind unreachable: %d\n",
- task->tk_pid, task->tk_status);
- if (!RPC_IS_SOFTCONN(task)) {
- rpc_delay(task, 5*HZ);
- goto retry_timeout;
- }
- status = task->tk_status;
- break;
- default:
- dprintk("RPC: %5u unrecognized rpcbind error (%d)\n",
- task->tk_pid, -task->tk_status);
- }
- rpc_exit(task, status);
- return;
- retry_timeout:
- task->tk_status = 0;
- task->tk_action = call_timeout;
- }
- /*
- * 4b. Connect to the RPC server
- */
- static void
- call_connect(struct rpc_task *task)
- {
- struct rpc_xprt *xprt = task->tk_rqstp->rq_xprt;
- dprintk("RPC: %5u call_connect xprt %p %s connected\n",
- task->tk_pid, xprt,
- (xprt_connected(xprt) ? "is" : "is not"));
- task->tk_action = call_transmit;
- if (!xprt_connected(xprt)) {
- task->tk_action = call_connect_status;
- if (task->tk_status < 0)
- return;
- if (task->tk_flags & RPC_TASK_NOCONNECT) {
- rpc_exit(task, -ENOTCONN);
- return;
- }
- xprt_connect(task);
- }
- }
- /*
- * 4c. Sort out connect result
- */
- static void
- call_connect_status(struct rpc_task *task)
- {
- struct rpc_clnt *clnt = task->tk_client;
- int status = task->tk_status;
- dprint_status(task);
- trace_rpc_connect_status(task);
- task->tk_status = 0;
- switch (status) {
- case -ECONNREFUSED:
- /* A positive refusal suggests a rebind is needed. */
- if (RPC_IS_SOFTCONN(task))
- break;
- if (clnt->cl_autobind) {
- rpc_force_rebind(clnt);
- task->tk_action = call_bind;
- return;
- }
- /* fall through */
- case -ECONNRESET:
- case -ECONNABORTED:
- case -ENETDOWN:
- case -ENETUNREACH:
- case -EHOSTUNREACH:
- case -EADDRINUSE:
- case -ENOBUFS:
- case -EPIPE:
- xprt_conditional_disconnect(task->tk_rqstp->rq_xprt,
- task->tk_rqstp->rq_connect_cookie);
- if (RPC_IS_SOFTCONN(task))
- break;
- /* retry with existing socket, after a delay */
- rpc_delay(task, 3*HZ);
- /* fall through */
- case -EAGAIN:
- /* Check for timeouts before looping back to call_bind */
- case -ETIMEDOUT:
- task->tk_action = call_timeout;
- return;
- case 0:
- clnt->cl_stats->netreconn++;
- task->tk_action = call_transmit;
- return;
- }
- rpc_exit(task, status);
- }
- /*
- * 5. Transmit the RPC request, and wait for reply
- */
- static void
- call_transmit(struct rpc_task *task)
- {
- int is_retrans = RPC_WAS_SENT(task);
- dprint_status(task);
- task->tk_action = call_status;
- if (task->tk_status < 0)
- return;
- if (!xprt_prepare_transmit(task))
- return;
- task->tk_action = call_transmit_status;
- /* Encode here so that rpcsec_gss can use correct sequence number. */
- if (rpc_task_need_encode(task)) {
- rpc_xdr_encode(task);
- /* Did the encode result in an error condition? */
- if (task->tk_status != 0) {
- /* Was the error nonfatal? */
- if (task->tk_status == -EAGAIN)
- rpc_delay(task, HZ >> 4);
- else
- rpc_exit(task, task->tk_status);
- return;
- }
- }
- xprt_transmit(task);
- if (task->tk_status < 0)
- return;
- if (is_retrans)
- task->tk_client->cl_stats->rpcretrans++;
- /*
- * On success, ensure that we call xprt_end_transmit() before sleeping
- * in order to allow access to the socket to other RPC requests.
- */
- call_transmit_status(task);
- if (rpc_reply_expected(task))
- return;
- task->tk_action = rpc_exit_task;
- rpc_wake_up_queued_task(&task->tk_rqstp->rq_xprt->pending, task);
- }
- /*
- * 5a. Handle cleanup after a transmission
- */
- static void
- call_transmit_status(struct rpc_task *task)
- {
- struct rpc_xprt *xprt = task->tk_rqstp->rq_xprt;
- task->tk_action = call_status;
- /*
- * Common case: success. Force the compiler to put this
- * test first. Or, if any error and xprt_close_wait,
- * release the xprt lock so the socket can close.
- */
- if (task->tk_status == 0 || xprt_close_wait(xprt)) {
- xprt_end_transmit(task);
- rpc_task_force_reencode(task);
- return;
- }
- switch (task->tk_status) {
- case -EAGAIN:
- case -ENOBUFS:
- break;
- default:
- dprint_status(task);
- xprt_end_transmit(task);
- rpc_task_force_reencode(task);
- break;
- /*
- * Special cases: if we've been waiting on the
- * socket's write_space() callback, or if the
- * socket just returned a connection error,
- * then hold onto the transport lock.
- */
- case -ECONNREFUSED:
- case -EHOSTDOWN:
- case -ENETDOWN:
- case -EHOSTUNREACH:
- case -ENETUNREACH:
- case -EPERM:
- if (RPC_IS_SOFTCONN(task)) {
- xprt_end_transmit(task);
- if (!task->tk_msg.rpc_proc->p_proc)
- trace_xprt_ping(task->tk_xprt,
- task->tk_status);
- rpc_exit(task, task->tk_status);
- break;
- }
- /* fall through */
- case -ECONNRESET:
- case -ECONNABORTED:
- case -EADDRINUSE:
- case -ENOTCONN:
- case -EPIPE:
- rpc_task_force_reencode(task);
- }
- }
- #if defined(CONFIG_SUNRPC_BACKCHANNEL)
- /*
- * 5b. Send the backchannel RPC reply. On error, drop the reply. In
- * addition, disconnect on connectivity errors.
- */
- static void
- call_bc_transmit(struct rpc_task *task)
- {
- struct rpc_rqst *req = task->tk_rqstp;
- if (!xprt_prepare_transmit(task))
- goto out_retry;
- if (task->tk_status < 0) {
- printk(KERN_NOTICE "RPC: Could not send backchannel reply "
- "error: %d\n", task->tk_status);
- goto out_done;
- }
- if (req->rq_connect_cookie != req->rq_xprt->connect_cookie)
- req->rq_bytes_sent = 0;
- xprt_transmit(task);
- if (task->tk_status == -EAGAIN)
- goto out_nospace;
- xprt_end_transmit(task);
- dprint_status(task);
- switch (task->tk_status) {
- case 0:
- /* Success */
- case -ENETDOWN:
- case -EHOSTDOWN:
- case -EHOSTUNREACH:
- case -ENETUNREACH:
- case -ECONNRESET:
- case -ECONNREFUSED:
- case -EADDRINUSE:
- case -ENOTCONN:
- case -EPIPE:
- break;
- case -ETIMEDOUT:
- /*
- * Problem reaching the server. Disconnect and let the
- * forechannel reestablish the connection. The server will
- * have to retransmit the backchannel request and we'll
- * reprocess it. Since these ops are idempotent, there's no
- * need to cache our reply at this time.
- */
- printk(KERN_NOTICE "RPC: Could not send backchannel reply "
- "error: %d\n", task->tk_status);
- xprt_conditional_disconnect(req->rq_xprt,
- req->rq_connect_cookie);
- break;
- default:
- /*
- * We were unable to reply and will have to drop the
- * request. The server should reconnect and retransmit.
- */
- WARN_ON_ONCE(task->tk_status == -EAGAIN);
- printk(KERN_NOTICE "RPC: Could not send backchannel reply "
- "error: %d\n", task->tk_status);
- break;
- }
- rpc_wake_up_queued_task(&req->rq_xprt->pending, task);
- out_done:
- task->tk_action = rpc_exit_task;
- return;
- out_nospace:
- req->rq_connect_cookie = req->rq_xprt->connect_cookie;
- out_retry:
- task->tk_status = 0;
- }
- #endif /* CONFIG_SUNRPC_BACKCHANNEL */
- /*
- * 6. Sort out the RPC call status
- */
- static void
- call_status(struct rpc_task *task)
- {
- struct rpc_clnt *clnt = task->tk_client;
- struct rpc_rqst *req = task->tk_rqstp;
- int status;
- if (!task->tk_msg.rpc_proc->p_proc)
- trace_xprt_ping(task->tk_xprt, task->tk_status);
- if (req->rq_reply_bytes_recvd > 0 && !req->rq_bytes_sent)
- task->tk_status = req->rq_reply_bytes_recvd;
- dprint_status(task);
- status = task->tk_status;
- if (status >= 0) {
- task->tk_action = call_decode;
- return;
- }
- trace_rpc_call_status(task);
- task->tk_status = 0;
- switch(status) {
- case -EHOSTDOWN:
- case -ENETDOWN:
- case -EHOSTUNREACH:
- case -ENETUNREACH:
- case -EPERM:
- if (RPC_IS_SOFTCONN(task)) {
- rpc_exit(task, status);
- break;
- }
- /*
- * Delay any retries for 3 seconds, then handle as if it
- * were a timeout.
- */
- rpc_delay(task, 3*HZ);
- /* fall through */
- case -ETIMEDOUT:
- task->tk_action = call_timeout;
- break;
- case -ECONNREFUSED:
- case -ECONNRESET:
- case -ECONNABORTED:
- rpc_force_rebind(clnt);
- /* fall through */
- case -EADDRINUSE:
- rpc_delay(task, 3*HZ);
- /* fall through */
- case -EPIPE:
- case -ENOTCONN:
- task->tk_action = call_bind;
- break;
- case -ENOBUFS:
- rpc_delay(task, HZ>>2);
- /* fall through */
- case -EAGAIN:
- task->tk_action = call_transmit;
- break;
- case -EIO:
- /* shutdown or soft timeout */
- rpc_exit(task, status);
- break;
- default:
- if (clnt->cl_chatty)
- printk("%s: RPC call returned error %d\n",
- clnt->cl_program->name, -status);
- rpc_exit(task, status);
- }
- }
- /*
- * 6a. Handle RPC timeout
- * We do not release the request slot, so we keep using the
- * same XID for all retransmits.
- */
- static void
- call_timeout(struct rpc_task *task)
- {
- struct rpc_clnt *clnt = task->tk_client;
- if (xprt_adjust_timeout(task->tk_rqstp) == 0) {
- dprintk("RPC: %5u call_timeout (minor)\n", task->tk_pid);
- goto retry;
- }
- dprintk("RPC: %5u call_timeout (major)\n", task->tk_pid);
- task->tk_timeouts++;
- if (RPC_IS_SOFTCONN(task)) {
- rpc_exit(task, -ETIMEDOUT);
- return;
- }
- if (RPC_IS_SOFT(task)) {
- if (clnt->cl_chatty) {
- printk(KERN_NOTICE "%s: server %s not responding, timed out\n",
- clnt->cl_program->name,
- task->tk_xprt->servername);
- }
- if (task->tk_flags & RPC_TASK_TIMEOUT)
- rpc_exit(task, -ETIMEDOUT);
- else
- rpc_exit(task, -EIO);
- return;
- }
- if (!(task->tk_flags & RPC_CALL_MAJORSEEN)) {
- task->tk_flags |= RPC_CALL_MAJORSEEN;
- if (clnt->cl_chatty) {
- printk(KERN_NOTICE "%s: server %s not responding, still trying\n",
- clnt->cl_program->name,
- task->tk_xprt->servername);
- }
- }
- rpc_force_rebind(clnt);
- /*
- * Did our request time out due to an RPCSEC_GSS out-of-sequence
- * event? RFC2203 requires the server to drop all such requests.
- */
- rpcauth_invalcred(task);
- retry:
- task->tk_action = call_bind;
- task->tk_status = 0;
- }
- /*
- * 7. Decode the RPC reply
- */
- static void
- call_decode(struct rpc_task *task)
- {
- struct rpc_clnt *clnt = task->tk_client;
- struct rpc_rqst *req = task->tk_rqstp;
- kxdrdproc_t decode = task->tk_msg.rpc_proc->p_decode;
- __be32 *p;
- dprint_status(task);
- if (task->tk_flags & RPC_CALL_MAJORSEEN) {
- if (clnt->cl_chatty) {
- printk(KERN_NOTICE "%s: server %s OK\n",
- clnt->cl_program->name,
- task->tk_xprt->servername);
- }
- task->tk_flags &= ~RPC_CALL_MAJORSEEN;
- }
- /*
- * Ensure that we see all writes made by xprt_complete_rqst()
- * before it changed req->rq_reply_bytes_recvd.
- */
- smp_rmb();
- req->rq_rcv_buf.len = req->rq_private_buf.len;
- /* Check that the softirq receive buffer is valid */
- WARN_ON(memcmp(&req->rq_rcv_buf, &req->rq_private_buf,
- sizeof(req->rq_rcv_buf)) != 0);
- if (req->rq_rcv_buf.len < 12) {
- if (!RPC_IS_SOFT(task)) {
- task->tk_action = call_bind;
- goto out_retry;
- }
- dprintk("RPC: %s: too small RPC reply size (%d bytes)\n",
- clnt->cl_program->name, task->tk_status);
- task->tk_action = call_timeout;
- goto out_retry;
- }
- p = rpc_verify_header(task);
- if (IS_ERR(p)) {
- if (p == ERR_PTR(-EAGAIN))
- goto out_retry;
- return;
- }
- task->tk_action = rpc_exit_task;
- if (decode) {
- task->tk_status = rpcauth_unwrap_resp(task, decode, req, p,
- task->tk_msg.rpc_resp);
- }
- dprintk("RPC: %5u call_decode result %d\n", task->tk_pid,
- task->tk_status);
- return;
- out_retry:
- task->tk_status = 0;
- /* Note: rpc_verify_header() may have freed the RPC slot */
- if (task->tk_rqstp == req) {
- req->rq_reply_bytes_recvd = req->rq_rcv_buf.len = 0;
- if (task->tk_client->cl_discrtry)
- xprt_conditional_disconnect(req->rq_xprt,
- req->rq_connect_cookie);
- }
- }
- static __be32 *
- rpc_encode_header(struct rpc_task *task)
- {
- struct rpc_clnt *clnt = task->tk_client;
- struct rpc_rqst *req = task->tk_rqstp;
- __be32 *p = req->rq_svec[0].iov_base;
- /* FIXME: check buffer size? */
- p = xprt_skip_transport_header(req->rq_xprt, p);
- *p++ = req->rq_xid; /* XID */
- *p++ = htonl(RPC_CALL); /* CALL */
- *p++ = htonl(RPC_VERSION); /* RPC version */
- *p++ = htonl(clnt->cl_prog); /* program number */
- *p++ = htonl(clnt->cl_vers); /* program version */
- *p++ = htonl(task->tk_msg.rpc_proc->p_proc); /* procedure */
- p = rpcauth_marshcred(task, p);
- req->rq_slen = xdr_adjust_iovec(&req->rq_svec[0], p);
- return p;
- }
- static __be32 *
- rpc_verify_header(struct rpc_task *task)
- {
- struct rpc_clnt *clnt = task->tk_client;
- struct kvec *iov = &task->tk_rqstp->rq_rcv_buf.head[0];
- int len = task->tk_rqstp->rq_rcv_buf.len >> 2;
- __be32 *p = iov->iov_base;
- u32 n;
- int error = -EACCES;
- if ((task->tk_rqstp->rq_rcv_buf.len & 3) != 0) {
- /* RFC-1014 says that the representation of XDR data must be a
- * multiple of four bytes
- * - if it isn't pointer subtraction in the NFS client may give
- * undefined results
- */
- dprintk("RPC: %5u %s: XDR representation not a multiple of"
- " 4 bytes: 0x%x\n", task->tk_pid, __func__,
- task->tk_rqstp->rq_rcv_buf.len);
- error = -EIO;
- goto out_err;
- }
- if ((len -= 3) < 0)
- goto out_overflow;
- p += 1; /* skip XID */
- if ((n = ntohl(*p++)) != RPC_REPLY) {
- dprintk("RPC: %5u %s: not an RPC reply: %x\n",
- task->tk_pid, __func__, n);
- error = -EIO;
- goto out_garbage;
- }
- if ((n = ntohl(*p++)) != RPC_MSG_ACCEPTED) {
- if (--len < 0)
- goto out_overflow;
- switch ((n = ntohl(*p++))) {
- case RPC_AUTH_ERROR:
- break;
- case RPC_MISMATCH:
- dprintk("RPC: %5u %s: RPC call version mismatch!\n",
- task->tk_pid, __func__);
- error = -EPROTONOSUPPORT;
- goto out_err;
- default:
- dprintk("RPC: %5u %s: RPC call rejected, "
- "unknown error: %x\n",
- task->tk_pid, __func__, n);
- error = -EIO;
- goto out_err;
- }
- if (--len < 0)
- goto out_overflow;
- switch ((n = ntohl(*p++))) {
- case RPC_AUTH_REJECTEDCRED:
- case RPC_AUTH_REJECTEDVERF:
- case RPCSEC_GSS_CREDPROBLEM:
- case RPCSEC_GSS_CTXPROBLEM:
- if (!task->tk_cred_retry)
- break;
- task->tk_cred_retry--;
- dprintk("RPC: %5u %s: retry stale creds\n",
- task->tk_pid, __func__);
- rpcauth_invalcred(task);
- /* Ensure we obtain a new XID! */
- xprt_release(task);
- task->tk_action = call_reserve;
- goto out_retry;
- case RPC_AUTH_BADCRED:
- case RPC_AUTH_BADVERF:
- /* possibly garbled cred/verf? */
- if (!task->tk_garb_retry)
- break;
- task->tk_garb_retry--;
- dprintk("RPC: %5u %s: retry garbled creds\n",
- task->tk_pid, __func__);
- task->tk_action = call_bind;
- goto out_retry;
- case RPC_AUTH_TOOWEAK:
- printk(KERN_NOTICE "RPC: server %s requires stronger "
- "authentication.\n",
- task->tk_xprt->servername);
- break;
- default:
- dprintk("RPC: %5u %s: unknown auth error: %x\n",
- task->tk_pid, __func__, n);
- error = -EIO;
- }
- dprintk("RPC: %5u %s: call rejected %d\n",
- task->tk_pid, __func__, n);
- goto out_err;
- }
- p = rpcauth_checkverf(task, p);
- if (IS_ERR(p)) {
- error = PTR_ERR(p);
- dprintk("RPC: %5u %s: auth check failed with %d\n",
- task->tk_pid, __func__, error);
- goto out_garbage; /* bad verifier, retry */
- }
- len = p - (__be32 *)iov->iov_base - 1;
- if (len < 0)
- goto out_overflow;
- switch ((n = ntohl(*p++))) {
- case RPC_SUCCESS:
- return p;
- case RPC_PROG_UNAVAIL:
- dprintk("RPC: %5u %s: program %u is unsupported "
- "by server %s\n", task->tk_pid, __func__,
- (unsigned int)clnt->cl_prog,
- task->tk_xprt->servername);
- error = -EPFNOSUPPORT;
- goto out_err;
- case RPC_PROG_MISMATCH:
- dprintk("RPC: %5u %s: program %u, version %u unsupported "
- "by server %s\n", task->tk_pid, __func__,
- (unsigned int)clnt->cl_prog,
- (unsigned int)clnt->cl_vers,
- task->tk_xprt->servername);
- error = -EPROTONOSUPPORT;
- goto out_err;
- case RPC_PROC_UNAVAIL:
- dprintk("RPC: %5u %s: proc %s unsupported by program %u, "
- "version %u on server %s\n",
- task->tk_pid, __func__,
- rpc_proc_name(task),
- clnt->cl_prog, clnt->cl_vers,
- task->tk_xprt->servername);
- error = -EOPNOTSUPP;
- goto out_err;
- case RPC_GARBAGE_ARGS:
- dprintk("RPC: %5u %s: server saw garbage\n",
- task->tk_pid, __func__);
- break; /* retry */
- default:
- dprintk("RPC: %5u %s: server accept status: %x\n",
- task->tk_pid, __func__, n);
- /* Also retry */
- }
- out_garbage:
- clnt->cl_stats->rpcgarbage++;
- if (task->tk_garb_retry) {
- task->tk_garb_retry--;
- dprintk("RPC: %5u %s: retrying\n",
- task->tk_pid, __func__);
- task->tk_action = call_bind;
- out_retry:
- return ERR_PTR(-EAGAIN);
- }
- out_err:
- rpc_exit(task, error);
- dprintk("RPC: %5u %s: call failed with error %d\n", task->tk_pid,
- __func__, error);
- return ERR_PTR(error);
- out_overflow:
- dprintk("RPC: %5u %s: server reply was truncated.\n", task->tk_pid,
- __func__);
- goto out_garbage;
- }
- static void rpcproc_encode_null(struct rpc_rqst *rqstp, struct xdr_stream *xdr,
- const void *obj)
- {
- }
- static int rpcproc_decode_null(struct rpc_rqst *rqstp, struct xdr_stream *xdr,
- void *obj)
- {
- return 0;
- }
- static const struct rpc_procinfo rpcproc_null = {
- .p_encode = rpcproc_encode_null,
- .p_decode = rpcproc_decode_null,
- };
- static int rpc_ping(struct rpc_clnt *clnt)
- {
- struct rpc_message msg = {
- .rpc_proc = &rpcproc_null,
- };
- int err;
- msg.rpc_cred = authnull_ops.lookup_cred(NULL, NULL, 0);
- err = rpc_call_sync(clnt, &msg, RPC_TASK_SOFT | RPC_TASK_SOFTCONN);
- put_rpccred(msg.rpc_cred);
- return err;
- }
- static
- struct rpc_task *rpc_call_null_helper(struct rpc_clnt *clnt,
- struct rpc_xprt *xprt, struct rpc_cred *cred, int flags,
- const struct rpc_call_ops *ops, void *data)
- {
- struct rpc_message msg = {
- .rpc_proc = &rpcproc_null,
- .rpc_cred = cred,
- };
- struct rpc_task_setup task_setup_data = {
- .rpc_client = clnt,
- .rpc_xprt = xprt,
- .rpc_message = &msg,
- .callback_ops = (ops != NULL) ? ops : &rpc_default_ops,
- .callback_data = data,
- .flags = flags,
- };
- return rpc_run_task(&task_setup_data);
- }
- struct rpc_task *rpc_call_null(struct rpc_clnt *clnt, struct rpc_cred *cred, int flags)
- {
- return rpc_call_null_helper(clnt, NULL, cred, flags, NULL, NULL);
- }
- EXPORT_SYMBOL_GPL(rpc_call_null);
- struct rpc_cb_add_xprt_calldata {
- struct rpc_xprt_switch *xps;
- struct rpc_xprt *xprt;
- };
- static void rpc_cb_add_xprt_done(struct rpc_task *task, void *calldata)
- {
- struct rpc_cb_add_xprt_calldata *data = calldata;
- if (task->tk_status == 0)
- rpc_xprt_switch_add_xprt(data->xps, data->xprt);
- }
- static void rpc_cb_add_xprt_release(void *calldata)
- {
- struct rpc_cb_add_xprt_calldata *data = calldata;
- xprt_put(data->xprt);
- xprt_switch_put(data->xps);
- kfree(data);
- }
- static const struct rpc_call_ops rpc_cb_add_xprt_call_ops = {
- .rpc_call_done = rpc_cb_add_xprt_done,
- .rpc_release = rpc_cb_add_xprt_release,
- };
- /**
- * rpc_clnt_test_and_add_xprt - Test and add a new transport to a rpc_clnt
- * @clnt: pointer to struct rpc_clnt
- * @xps: pointer to struct rpc_xprt_switch,
- * @xprt: pointer struct rpc_xprt
- * @dummy: unused
- */
- int rpc_clnt_test_and_add_xprt(struct rpc_clnt *clnt,
- struct rpc_xprt_switch *xps, struct rpc_xprt *xprt,
- void *dummy)
- {
- struct rpc_cb_add_xprt_calldata *data;
- struct rpc_cred *cred;
- struct rpc_task *task;
- data = kmalloc(sizeof(*data), GFP_NOFS);
- if (!data)
- return -ENOMEM;
- data->xps = xprt_switch_get(xps);
- data->xprt = xprt_get(xprt);
- cred = authnull_ops.lookup_cred(NULL, NULL, 0);
- task = rpc_call_null_helper(clnt, xprt, cred,
- RPC_TASK_SOFT|RPC_TASK_SOFTCONN|RPC_TASK_ASYNC,
- &rpc_cb_add_xprt_call_ops, data);
- put_rpccred(cred);
- if (IS_ERR(task))
- return PTR_ERR(task);
- rpc_put_task(task);
- return 1;
- }
- EXPORT_SYMBOL_GPL(rpc_clnt_test_and_add_xprt);
- /**
- * rpc_clnt_setup_test_and_add_xprt()
- *
- * This is an rpc_clnt_add_xprt setup() function which returns 1 so:
- * 1) caller of the test function must dereference the rpc_xprt_switch
- * and the rpc_xprt.
- * 2) test function must call rpc_xprt_switch_add_xprt, usually in
- * the rpc_call_done routine.
- *
- * Upon success (return of 1), the test function adds the new
- * transport to the rpc_clnt xprt switch
- *
- * @clnt: struct rpc_clnt to get the new transport
- * @xps: the rpc_xprt_switch to hold the new transport
- * @xprt: the rpc_xprt to test
- * @data: a struct rpc_add_xprt_test pointer that holds the test function
- * and test function call data
- */
- int rpc_clnt_setup_test_and_add_xprt(struct rpc_clnt *clnt,
- struct rpc_xprt_switch *xps,
- struct rpc_xprt *xprt,
- void *data)
- {
- struct rpc_cred *cred;
- struct rpc_task *task;
- struct rpc_add_xprt_test *xtest = (struct rpc_add_xprt_test *)data;
- int status = -EADDRINUSE;
- xprt = xprt_get(xprt);
- xprt_switch_get(xps);
- if (rpc_xprt_switch_has_addr(xps, (struct sockaddr *)&xprt->addr))
- goto out_err;
- /* Test the connection */
- cred = authnull_ops.lookup_cred(NULL, NULL, 0);
- task = rpc_call_null_helper(clnt, xprt, cred,
- RPC_TASK_SOFT | RPC_TASK_SOFTCONN,
- NULL, NULL);
- put_rpccred(cred);
- if (IS_ERR(task)) {
- status = PTR_ERR(task);
- goto out_err;
- }
- status = task->tk_status;
- rpc_put_task(task);
- if (status < 0)
- goto out_err;
- /* rpc_xprt_switch and rpc_xprt are deferrenced by add_xprt_test() */
- xtest->add_xprt_test(clnt, xprt, xtest->data);
- /* so that rpc_clnt_add_xprt does not call rpc_xprt_switch_add_xprt */
- return 1;
- out_err:
- xprt_put(xprt);
- xprt_switch_put(xps);
- pr_info("RPC: rpc_clnt_test_xprt failed: %d addr %s not added\n",
- status, xprt->address_strings[RPC_DISPLAY_ADDR]);
- return status;
- }
- EXPORT_SYMBOL_GPL(rpc_clnt_setup_test_and_add_xprt);
- /**
- * rpc_clnt_add_xprt - Add a new transport to a rpc_clnt
- * @clnt: pointer to struct rpc_clnt
- * @xprtargs: pointer to struct xprt_create
- * @setup: callback to test and/or set up the connection
- * @data: pointer to setup function data
- *
- * Creates a new transport using the parameters set in args and
- * adds it to clnt.
- * If ping is set, then test that connectivity succeeds before
- * adding the new transport.
- *
- */
- int rpc_clnt_add_xprt(struct rpc_clnt *clnt,
- struct xprt_create *xprtargs,
- int (*setup)(struct rpc_clnt *,
- struct rpc_xprt_switch *,
- struct rpc_xprt *,
- void *),
- void *data)
- {
- struct rpc_xprt_switch *xps;
- struct rpc_xprt *xprt;
- unsigned long connect_timeout;
- unsigned long reconnect_timeout;
- unsigned char resvport;
- int ret = 0;
- rcu_read_lock();
- xps = xprt_switch_get(rcu_dereference(clnt->cl_xpi.xpi_xpswitch));
- xprt = xprt_iter_xprt(&clnt->cl_xpi);
- if (xps == NULL || xprt == NULL) {
- rcu_read_unlock();
- xprt_switch_put(xps);
- return -EAGAIN;
- }
- resvport = xprt->resvport;
- connect_timeout = xprt->connect_timeout;
- reconnect_timeout = xprt->max_reconnect_timeout;
- rcu_read_unlock();
- xprt = xprt_create_transport(xprtargs);
- if (IS_ERR(xprt)) {
- ret = PTR_ERR(xprt);
- goto out_put_switch;
- }
- xprt->resvport = resvport;
- if (xprt->ops->set_connect_timeout != NULL)
- xprt->ops->set_connect_timeout(xprt,
- connect_timeout,
- reconnect_timeout);
- rpc_xprt_switch_set_roundrobin(xps);
- if (setup) {
- ret = setup(clnt, xps, xprt, data);
- if (ret != 0)
- goto out_put_xprt;
- }
- rpc_xprt_switch_add_xprt(xps, xprt);
- out_put_xprt:
- xprt_put(xprt);
- out_put_switch:
- xprt_switch_put(xps);
- return ret;
- }
- EXPORT_SYMBOL_GPL(rpc_clnt_add_xprt);
- struct connect_timeout_data {
- unsigned long connect_timeout;
- unsigned long reconnect_timeout;
- };
- static int
- rpc_xprt_set_connect_timeout(struct rpc_clnt *clnt,
- struct rpc_xprt *xprt,
- void *data)
- {
- struct connect_timeout_data *timeo = data;
- if (xprt->ops->set_connect_timeout)
- xprt->ops->set_connect_timeout(xprt,
- timeo->connect_timeout,
- timeo->reconnect_timeout);
- return 0;
- }
- void
- rpc_set_connect_timeout(struct rpc_clnt *clnt,
- unsigned long connect_timeout,
- unsigned long reconnect_timeout)
- {
- struct connect_timeout_data timeout = {
- .connect_timeout = connect_timeout,
- .reconnect_timeout = reconnect_timeout,
- };
- rpc_clnt_iterate_for_each_xprt(clnt,
- rpc_xprt_set_connect_timeout,
- &timeout);
- }
- EXPORT_SYMBOL_GPL(rpc_set_connect_timeout);
- void rpc_clnt_xprt_switch_put(struct rpc_clnt *clnt)
- {
- rcu_read_lock();
- xprt_switch_put(rcu_dereference(clnt->cl_xpi.xpi_xpswitch));
- rcu_read_unlock();
- }
- EXPORT_SYMBOL_GPL(rpc_clnt_xprt_switch_put);
- void rpc_clnt_xprt_switch_add_xprt(struct rpc_clnt *clnt, struct rpc_xprt *xprt)
- {
- rcu_read_lock();
- rpc_xprt_switch_add_xprt(rcu_dereference(clnt->cl_xpi.xpi_xpswitch),
- xprt);
- rcu_read_unlock();
- }
- EXPORT_SYMBOL_GPL(rpc_clnt_xprt_switch_add_xprt);
- bool rpc_clnt_xprt_switch_has_addr(struct rpc_clnt *clnt,
- const struct sockaddr *sap)
- {
- struct rpc_xprt_switch *xps;
- bool ret;
- rcu_read_lock();
- xps = rcu_dereference(clnt->cl_xpi.xpi_xpswitch);
- ret = rpc_xprt_switch_has_addr(xps, sap);
- rcu_read_unlock();
- return ret;
- }
- EXPORT_SYMBOL_GPL(rpc_clnt_xprt_switch_has_addr);
- #if IS_ENABLED(CONFIG_SUNRPC_DEBUG)
- static void rpc_show_header(void)
- {
- printk(KERN_INFO "-pid- flgs status -client- --rqstp- "
- "-timeout ---ops--\n");
- }
- static void rpc_show_task(const struct rpc_clnt *clnt,
- const struct rpc_task *task)
- {
- const char *rpc_waitq = "none";
- if (RPC_IS_QUEUED(task))
- rpc_waitq = rpc_qname(task->tk_waitqueue);
- printk(KERN_INFO "%5u %04x %6d %8p %8p %8ld %8p %sv%u %s a:%ps q:%s\n",
- task->tk_pid, task->tk_flags, task->tk_status,
- clnt, task->tk_rqstp, task->tk_timeout, task->tk_ops,
- clnt->cl_program->name, clnt->cl_vers, rpc_proc_name(task),
- task->tk_action, rpc_waitq);
- }
- void rpc_show_tasks(struct net *net)
- {
- struct rpc_clnt *clnt;
- struct rpc_task *task;
- int header = 0;
- struct sunrpc_net *sn = net_generic(net, sunrpc_net_id);
- spin_lock(&sn->rpc_client_lock);
- list_for_each_entry(clnt, &sn->all_clients, cl_clients) {
- spin_lock(&clnt->cl_lock);
- list_for_each_entry(task, &clnt->cl_tasks, tk_task) {
- if (!header) {
- rpc_show_header();
- header++;
- }
- rpc_show_task(clnt, task);
- }
- spin_unlock(&clnt->cl_lock);
- }
- spin_unlock(&sn->rpc_client_lock);
- }
- #endif
- #if IS_ENABLED(CONFIG_SUNRPC_SWAP)
- static int
- rpc_clnt_swap_activate_callback(struct rpc_clnt *clnt,
- struct rpc_xprt *xprt,
- void *dummy)
- {
- return xprt_enable_swap(xprt);
- }
- int
- rpc_clnt_swap_activate(struct rpc_clnt *clnt)
- {
- if (atomic_inc_return(&clnt->cl_swapper) == 1)
- return rpc_clnt_iterate_for_each_xprt(clnt,
- rpc_clnt_swap_activate_callback, NULL);
- return 0;
- }
- EXPORT_SYMBOL_GPL(rpc_clnt_swap_activate);
- static int
- rpc_clnt_swap_deactivate_callback(struct rpc_clnt *clnt,
- struct rpc_xprt *xprt,
- void *dummy)
- {
- xprt_disable_swap(xprt);
- return 0;
- }
- void
- rpc_clnt_swap_deactivate(struct rpc_clnt *clnt)
- {
- if (atomic_dec_if_positive(&clnt->cl_swapper) == 0)
- rpc_clnt_iterate_for_each_xprt(clnt,
- rpc_clnt_swap_deactivate_callback, NULL);
- }
- EXPORT_SYMBOL_GPL(rpc_clnt_swap_deactivate);
- #endif /* CONFIG_SUNRPC_SWAP */
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