Release 4.11 net/sunrpc/clnt.c

/*
 *  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);
}

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3
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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);
}

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static void __rpc_clnt_remove_pipedir(struct rpc_clnt *clnt)
{
	rpc_remove_client_dir(clnt);
}

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16
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3
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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);
	}
}

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49
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2
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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;
}

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58.33%
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30
17.86%
1
8.33%
Al Viro
15
8.93%
2
16.67%
Christoph Hellwig
10
5.95%
1
8.33%
Weston Andros Adamson
9
5.36%
1
8.33%
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168
100.00%
12
100.00%


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;
}

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25.86%
4
57.14%
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58
100.00%
7
100.00%



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;
}

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46.51%
2
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86
100.00%
5
100.00%



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;
}

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8
8.60%
1
25.00%
Amitoj Kaur Chawla
1
1.08%
1
25.00%
Total
93
100.00%
4
100.00%



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;
}

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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;
}

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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;
}

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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);
}

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void rpc_clients_notifier_unregister(void)
{
	return rpc_pipefs_notifier_unregister(&rpc_clients_block);
}

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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;
}

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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));
}

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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;
}

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26.23%
4
57.14%
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10
5.46%
1
14.29%
Jeff Layton
10
5.46%
1
14.29%
Total
183
100.00%
7
100.00%

static DEFINE_IDA(rpc_clids);



void rpc_cleanup_clids(void)
{
	ida_destroy(&rpc_clids);
}

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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;
}

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static void rpc_free_clid(struct rpc_clnt *clnt)
{
	ida_simple_remove(&rpc_clids, clnt->cl_clid);
}

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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);
}

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24.39%
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5.71%
Chuck Lever
19
3.89%
5
14.29%
Olga Kornievskaia
6
1.23%
1
2.86%
Stanislav Kinsbursky
6
1.23%
1
2.86%
Benny Halevy
5
1.02%
1
2.86%
J. Bruce Fields
4
0.82%
1
2.86%
Panagiotis Issaris
1
0.20%
1
2.86%
Total
488
100.00%
35
100.00%



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;
}

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24.34%
3
42.86%
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16.10%
2
28.57%
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6
2.25%
1
14.29%
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267
100.00%
7
100.00%

/**
 * 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);
}
Contributors
Person
Tokens
Prop
Commits
CommitProp
Chuck Lever
225
63.56%
6
27.27%
J. Bruce Fields
55
15.54%
2
9.09%
Trond Myklebust
27
7.63%
4
18.18%
Frank van Maarseveen
25
7.06%
2
9.09%
Alexandros Batsakis
7
1.98%
1
4.55%
Pavel Emelyanov
7
1.98%
1
4.55%
Harvey Harrison
4
1.13%
3
13.64%
Talpey, Thomas
2
0.56%
2
9.09%
Kinglong Mee
2
0.56%
1
4.55%
Total
354
100.00%
22
100.00%


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);
}

Contributors
Person
Tokens
Prop
Commits
CommitProp
Trond Myklebust
139
67.80%
14
70.00%
Chuck Lever
59
28.78%
3
15.00%
Olga Kornievskaia
5
2.44%
1
5.00%
Andreas Gruenbacher
1
0.49%
1
5.00%
Harvey Harrison
1
0.49%
1
5.00%
Total
205
100.00%
20
100.00%

/**
 * 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