Release 4.7 fs/nfs/callback.c

/*
 * linux/fs/nfs/callback.c
 *
 * Copyright (C) 2004 Trond Myklebust
 *
 * NFSv4 callback handling
 */

#include <linux/completion.h>
#include <linux/ip.h>
#include <linux/module.h>
#include <linux/sunrpc/svc.h>
#include <linux/sunrpc/svcsock.h>
#include <linux/nfs_fs.h>
#include <linux/errno.h>
#include <linux/mutex.h>
#include <linux/freezer.h>
#include <linux/kthread.h>
#include <linux/sunrpc/svcauth_gss.h>
#include <linux/sunrpc/bc_xprt.h>

#include <net/inet_sock.h>

#include "nfs4_fs.h"
#include "callback.h"
#include "internal.h"
#include "netns.h"


#define NFSDBG_FACILITY NFSDBG_CALLBACK


struct nfs_callback_data {
	
unsigned int users;
	
struct svc_serv *serv;
	
struct svc_rqst *rqst;
	
struct task_struct *task;
};


static struct nfs_callback_data nfs_callback_info[NFS4_MAX_MINOR_VERSION + 1];
static DEFINE_MUTEX(nfs_callback_mutex);

static struct svc_program nfs4_callback_program;



static int nfs4_callback_up_net(struct svc_serv *serv, struct net *net)
{
	int ret;
	struct nfs_net *nn = net_generic(net, nfs_net_id);

	ret = svc_create_xprt(serv, "tcp", net, PF_INET,
				nfs_callback_set_tcpport, SVC_SOCK_ANONYMOUS);
	if (ret <= 0)
		goto out_err;
	nn->nfs_callback_tcpport = ret;
	dprintk("NFS: Callback listener port = %u (af %u, net %p)\n",
			nn->nfs_callback_tcpport, PF_INET, net);

	ret = svc_create_xprt(serv, "tcp", net, PF_INET6,
				nfs_callback_set_tcpport, SVC_SOCK_ANONYMOUS);
	if (ret > 0) {
		nn->nfs_callback_tcpport6 = ret;
		dprintk("NFS: Callback listener port = %u (af %u, net %p)\n",
				nn->nfs_callback_tcpport6, PF_INET6, net);
	} else if (ret != -EAFNOSUPPORT)
		goto out_err;
	return 0;

out_err:
	return (ret) ? ret : -ENOMEM;
}

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/*
 * This is the NFSv4 callback kernel thread.
 */

static int

nfs4_callback_svc(void *vrqstp)
{
	int err;
	struct svc_rqst *rqstp = vrqstp;

	set_freezable();

	while (!kthread_should_stop()) {
		/*
                 * Listen for a request on the socket
                 */
		err = svc_recv(rqstp, MAX_SCHEDULE_TIMEOUT);
		if (err == -EAGAIN || err == -EINTR)
			continue;
		svc_process(rqstp);
	}
	return 0;
}

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jeff layton
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24.19%
1
20.00%
rafael j. wysocki
rafael j. wysocki
3
4.84%
1
20.00%
benny halevy
benny halevy
1
1.61%
1
20.00%
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62
100.00%
5
100.00%

/*
 * Prepare to bring up the NFSv4 callback service
 */

static struct svc_rqst *

nfs4_callback_up(struct svc_serv *serv)
{
	return svc_prepare_thread(serv, &serv->sv_pools[0], NUMA_NO_NODE);
}

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benny halevy
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31.03%
1
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jeff layton
8
27.59%
1
20.00%
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eric dumazet
2
6.90%
1
20.00%
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29
100.00%
5
100.00%

#if defined(CONFIG_NFS_V4_1)
/*
 * The callback service for NFSv4.1 callbacks
 */

static int

nfs41_callback_svc(void *vrqstp)
{
	struct svc_rqst *rqstp = vrqstp;
	struct svc_serv *serv = rqstp->rq_server;
	struct rpc_rqst *req;
	int error;
	DEFINE_WAIT(wq);

	set_freezable();

	while (!kthread_should_stop()) {
		if (try_to_freeze())
			continue;

		prepare_to_wait(&serv->sv_cb_waitq, &wq, TASK_INTERRUPTIBLE);
		spin_lock_bh(&serv->sv_cb_lock);
		if (!list_empty(&serv->sv_cb_list)) {
			req = list_first_entry(&serv->sv_cb_list,
					struct rpc_rqst, rq_bc_list);
			list_del(&req->rq_bc_list);
			spin_unlock_bh(&serv->sv_cb_lock);
			finish_wait(&serv->sv_cb_waitq, &wq);
			dprintk("Invoking bc_svc_process()\n");
			error = bc_svc_process(serv, req, rqstp);
			dprintk("bc_svc_process() returned w/ error code= %d\n",
				error);
		} else {
			spin_unlock_bh(&serv->sv_cb_lock);
			schedule();
			finish_wait(&serv->sv_cb_waitq, &wq);
		}
		flush_signals(current);
	}
	return 0;
}

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ricardo labiaga
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jeff layton
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13.83%
3
75.00%
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188
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4
100.00%

/*
 * Bring up the NFSv4.1 callback service
 */

static struct svc_rqst *

nfs41_callback_up(struct svc_serv *serv)
{
	struct svc_rqst *rqstp;

	INIT_LIST_HEAD(&serv->sv_cb_list);
	spin_lock_init(&serv->sv_cb_lock);
	init_waitqueue_head(&serv->sv_cb_waitq);
	rqstp = svc_prepare_thread(serv, &serv->sv_pools[0], NUMA_NO_NODE);
	dprintk("--> %s return %d\n", __func__, PTR_ERR_OR_ZERO(rqstp));
	return rqstp;
}

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ricardo labiaga
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benny halevy
16
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1
16.67%
andy adamson
andy adamson
4
5.41%
1
16.67%
eric dumazet
eric dumazet
2
2.70%
1
16.67%
geyslan g. bem
geyslan g. bem
2
2.70%
1
16.67%
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trond myklebust
1
1.35%
1
16.67%
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74
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6
100.00%



static void nfs_minorversion_callback_svc_setup(struct svc_serv *serv,
		struct svc_rqst **rqstpp, int (**callback_svc)(void *vrqstp))
{
	*rqstpp = nfs41_callback_up(serv);
	*callback_svc = nfs41_callback_svc;
}

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ricardo labiaga
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2.38%
1
50.00%
Total
42
100.00%
2
100.00%



static inline void nfs_callback_bc_serv(u32 minorversion, struct rpc_xprt *xprt,
		struct svc_serv *serv)
{
	if (minorversion)
		/*
                 * Save the svc_serv in the transport so that it can
                 * be referenced when the session backchannel is initialized
                 */
		xprt->bc_serv = serv;
}
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ricardo labiaga
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stanislav kinsbursky
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9.68%
1
50.00%
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31
100.00%
2
100.00%

#else


static void nfs_minorversion_callback_svc_setup(struct svc_serv *serv,
		struct svc_rqst **rqstpp, int (**callback_svc)(void *vrqstp))
{
	*rqstpp = ERR_PTR(-ENOTSUPP);
	*callback_svc = ERR_PTR(-ENOTSUPP);
}

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ricardo labiaga
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1
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47
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2
100.00%



static inline void nfs_callback_bc_serv(u32 minorversion, struct rpc_xprt *xprt,
		struct svc_serv *serv)
{
}
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#endif /* CONFIG_NFS_V4_1 */



static int nfs_callback_start_svc(int minorversion, struct rpc_xprt *xprt,
				  struct svc_serv *serv)
{
	struct svc_rqst *rqstp;
	int (*callback_svc)(void *vrqstp);
	struct nfs_callback_data *cb_info = &nfs_callback_info[minorversion];
	int ret;

	nfs_callback_bc_serv(minorversion, xprt, serv);

	if (cb_info->task)
		return 0;

	switch (minorversion) {
	case 0:
		/* v4.0 callback setup */
		rqstp = nfs4_callback_up(serv);
		callback_svc = nfs4_callback_svc;
		break;
	default:
		nfs_minorversion_callback_svc_setup(serv,
				&rqstp, &callback_svc);
	}

	if (IS_ERR(rqstp))
		return PTR_ERR(rqstp);

	svc_sock_update_bufs(serv);

	cb_info->serv = serv;
	cb_info->rqst = rqstp;
	cb_info->task = kthread_create(callback_svc, cb_info->rqst,
				    "nfsv4.%u-svc", minorversion);
	if (IS_ERR(cb_info->task)) {
		ret = PTR_ERR(cb_info->task);
		svc_exit_thread(cb_info->rqst);
		cb_info->rqst = NULL;
		cb_info->task = NULL;
		return ret;
	}
	rqstp->rq_task = cb_info->task;
	wake_up_process(cb_info->task);
	dprintk("nfs_callback_up: service started\n");
	return 0;
}

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57.14%
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14.29%
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7
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static void nfs_callback_down_net(u32 minorversion, struct svc_serv *serv, struct net *net)
{
	struct nfs_net *nn = net_generic(net, nfs_net_id);

	if (--nn->cb_users[minorversion])
		return;

	dprintk("NFS: destroy per-net callback data; net=%p\n", net);
	svc_shutdown_net(serv, net);
}

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static int nfs_callback_up_net(int minorversion, struct svc_serv *serv,
			       struct net *net, struct rpc_xprt *xprt)
{
	struct nfs_net *nn = net_generic(net, nfs_net_id);
	int ret;

	if (nn->cb_users[minorversion]++)
		return 0;

	dprintk("NFS: create per-net callback data; net=%p\n", net);

	ret = svc_bind(serv, net);
	if (ret < 0) {
		printk(KERN_WARNING "NFS: bind callback service failed\n");
		goto err_bind;
	}

	ret = -EPROTONOSUPPORT;
	if (minorversion == 0)
		ret = nfs4_callback_up_net(serv, net);
	else if (xprt->ops->bc_up)
		ret = xprt->ops->bc_up(serv, net);

	if (ret < 0) {
		printk(KERN_ERR "NFS: callback service start failed\n");
		goto err_socks;
	}
	return 0;

err_socks:
	svc_rpcb_cleanup(serv, net);
err_bind:
	dprintk("NFS: Couldn't create callback socket: err = %d; "
			"net = %p\n", ret, net);
	return ret;
}

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4
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static struct svc_serv_ops nfs_cb_sv_ops = {
	.svo_enqueue_xprt	= svc_xprt_do_enqueue,
};



static struct svc_serv *nfs_callback_create_svc(int minorversion)
{
	struct nfs_callback_data *cb_info = &nfs_callback_info[minorversion];
	struct svc_serv *serv;

	/*
         * Check whether we're already up and running.
         */
	if (cb_info->task) {
		/*
                 * Note: increase service usage, because later in case of error
                 * svc_destroy() will be called.
                 */
		svc_get(cb_info->serv);
		return cb_info->serv;
	}

	/*
         * Sanity check: if there's no task,
         * we should be the first user ...
         */
	if (cb_info->users)
		printk(KERN_WARNING "nfs_callback_create_svc: no kthread, %d users??\n",
			cb_info->users);

	serv = svc_create(&nfs4_callback_program, NFS4_CALLBACK_BUFSIZE, &nfs_cb_sv_ops);
	if (!serv) {
		printk(KERN_ERR "nfs_callback_create_svc: create service failed\n");
		return ERR_PTR(-ENOMEM);
	}
	/* As there is only one thread we need to over-ride the
         * default maximum of 80 connections
         */
	serv->sv_maxconn = 1024;
	dprintk("nfs_callback_create_svc: service created\n");
	return serv;
}

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100.00%
2
100.00%

/*
 * Bring up the callback thread if it is not already up.
 */


int nfs_callback_up(u32 minorversion, struct rpc_xprt *xprt)
{
	struct svc_serv *serv;
	struct nfs_callback_data *cb_info = &nfs_callback_info[minorversion];
	int ret;
	struct net *net = xprt->xprt_net;

	mutex_lock(&nfs_callback_mutex);

	serv = nfs_callback_create_svc(minorversion);
	if (IS_ERR(serv)) {
		ret = PTR_ERR(serv);
		goto err_create;
	}

	ret = nfs_callback_up_net(minorversion, serv, net, xprt);
	if (ret < 0)
		goto err_net;

	ret = nfs_callback_start_svc(minorversion, xprt, serv);
	if (ret < 0)
		goto err_start;

	cb_info->users++;
	/*
         * svc_create creates the svc_serv with sv_nrthreads == 1, and then
         * svc_prepare_thread increments that. So we need to call svc_destroy
         * on both success and failure so that the refcount is 1 when the
         * thread exits.
         */
err_net:
	svc_destroy(serv);
err_create:
	mutex_unlock(&nfs_callback_mutex);
	return ret;

err_start:
	nfs_callback_down_net(minorversion, serv, net);
	dprintk("NFS: Couldn't create server thread; err = %d\n", ret);
	goto err_net;
}

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benny halevy
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18.75%
1
6.67%
jeff layton
jeff layton
12
7.50%
2
13.33%
trond myklebust
trond myklebust
11
6.88%
1
6.67%
andy adamson
andy adamson
10
6.25%
1
6.67%
chuck lever
chuck lever
8
5.00%
2
13.33%
ricardo labiaga
ricardo labiaga
5
3.12%
1
6.67%
ingo molnar
ingo molnar
2
1.25%
1
6.67%
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160
100.00%
15
100.00%

/*
 * Kill the callback thread if it's no longer being used.
 */


void nfs_callback_down(int minorversion, struct net *net)
{
	struct nfs_callback_data *cb_info = &nfs_callback_info[minorversion];

	mutex_lock(&nfs_callback_mutex);
	nfs_callback_down_net(minorversion, cb_info->serv, net);
	cb_info->users--;
	if (cb_info->users == 0 && cb_info->task != NULL) {
		kthread_stop(cb_info->task);
		dprintk("nfs_callback_down: service stopped\n");
		svc_exit_thread(cb_info->rqst);
		dprintk("nfs_callback_down: service destroyed\n");
		cb_info->serv = NULL;
		cb_info->rqst = NULL;
		cb_info->task = NULL;
	}
	mutex_unlock(&nfs_callback_mutex);
}

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23.64%
3
27.27%
trond myklebust
trond myklebust
24
21.82%
2
18.18%
jeff layton
jeff layton
22
20.00%
2
18.18%
ingo molnar
ingo molnar
4
3.64%
1
9.09%
ricardo labiaga
ricardo labiaga
4
3.64%
1
9.09%
david howells
david howells
1
0.91%
1
9.09%
Total
110
100.00%
11
100.00%

/* Boolean check of RPC_AUTH_GSS principal */

int

check_gss_callback_principal(struct nfs_client *clp, struct svc_rqst *rqstp)
{
	char *p = rqstp->rq_cred.cr_principal;

	if (rqstp->rq_authop->flavour != RPC_AUTH_GSS)
		return 1;

	/* No RPC_AUTH_GSS on NFSv4.1 back channel yet */
	if (clp->cl_minorversion != 0)
		return 0;
	/*
         * It might just be a normal user principal, in which case
         * userspace won't bother to tell us the name at all.
         */
	if (p == NULL)
		return 0;

	/*
         * Did we get the acceptor from userland during the SETCLIENID
         * negotiation?
         */
	if (clp->cl_acceptor)
		return !strcmp(p, clp->cl_acceptor);

	/*
         * Otherwise try to verify it using the cl_hostname. Note that this
         * doesn't work if a non-canonical hostname was used in the devname.
         */

	/* Expect a GSS_C_NT_HOSTBASED_NAME like "nfs@serverhostname" */

	if (memcmp(p, "nfs@", 4) != 0)
		return 0;
	p += 4;
	if (strcmp(p, clp->cl_hostname) != 0)
		return 0;
	return 1;
}

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51.26%
1
14.29%
andy adamson
andy adamson
33
27.73%
3
42.86%
jeff layton
jeff layton
19
15.97%
1
14.29%
j. bruce fields
j. bruce fields
4
3.36%
1
14.29%
trond myklebust
trond myklebust
2
1.68%
1
14.29%
Total
119
100.00%
7
100.00%

/*
 * pg_authenticate method for nfsv4 callback threads.
 *
 * The authflavor has been negotiated, so an incorrect flavor is a server
 * bug. Deny packets with incorrect authflavor.
 *
 * All other checking done after NFS decoding where the nfs_client can be
 * found in nfs4_callback_compound
 */


static int nfs_callback_authenticate(struct svc_rqst *rqstp)
{
	switch (rqstp->rq_authop->flavour) {
	case RPC_AUTH_NULL:
		if (rqstp->rq_proc != CB_NULL)
			return SVC_DENIED;
		break;
	case RPC_AUTH_GSS:
		/* No RPC_AUTH_GSS support yet in NFSv4.1 */
		 if (svc_is_backchannel(rqstp))
			return SVC_DENIED;
	}
	return SVC_OK;
}

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56.60%
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20.00%
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andy adamson
10
18.87%
1
20.00%
neil brown
neil brown
8
15.09%
1
20.00%
olga kornievskaia
olga kornievskaia
3
5.66%
1
20.00%
jeff layton
jeff layton
2
3.77%
1
20.00%
Total
53
100.00%
5
100.00%

/*
 * Define NFS4 callback program
 */

static struct svc_version *nfs4_callback_version[] = {
	[1] = &nfs4_callback_version1,
	[4] = &nfs4_callback_version4,
};


static struct svc_stat nfs4_callback_stats;


static struct svc_program nfs4_callback_program = {
	.pg_prog = NFS4_CALLBACK,			/* RPC service number */
	.pg_nvers = ARRAY_SIZE(nfs4_callback_version),	/* Number of entries */
	.pg_vers = nfs4_callback_version,		/* version table */
	.pg_name = "NFSv4 callback",			/* service name */
	.pg_class = "nfs",				/* authentication class */
	.pg_stats = &nfs4_callback_stats,
	.pg_authenticate = nfs_callback_authenticate,
};
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11
21.15%
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ricardo labiaga
355
19.23%
1
1.92%
trond myklebust
trond myklebust
307
16.63%
9
17.31%
jeff layton
jeff layton
128
6.93%
10
19.23%
andy adamson
andy adamson
93
5.04%
5
9.62%
olga kornievskaia
olga kornievskaia
67
3.63%
1
1.92%
benny halevy
benny halevy
58
3.14%
2
3.85%
chuck lever
chuck lever
35
1.90%
2
3.85%
ingo molnar
ingo molnar
11
0.60%
1
1.92%
neil brown
neil brown
10
0.54%
1
1.92%
alexandros batsakis
alexandros batsakis
7
0.38%
1
1.92%
rafael j. wysocki
rafael j. wysocki
6
0.33%
1
1.92%
david howells
david howells
4
0.22%
2
3.85%
eric dumazet
eric dumazet
4
0.22%
1
1.92%
j. bruce fields
j. bruce fields
4
0.22%
1
1.92%
kees cook
kees cook
3
0.16%
1
1.92%
arnaldo carvalho de melo
arnaldo carvalho de melo
3
0.16%
1
1.92%
geyslan g. bem
geyslan g. bem
2
0.11%
1
1.92%
Total
1846
100.00%
52
100.00%
  
Directory: fs/nfs

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