mirror of
https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git
synced 2024-08-27 19:29:37 +00:00
![Geyslan G. Bem](/assets/img/avatar_default.png)
Use 'PTR_ERR_OR_ZERO()' rather than 'IS_ERR(...) ? PTR_ERR(...) : 0'. Signed-off-by: Geyslan G. Bem <geyslan@gmail.com> Signed-off-by: Trond Myklebust <Trond.Myklebust@netapp.com>
483 lines
12 KiB
C
483 lines
12 KiB
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;
|
|
}
|
|
|
|
/*
|
|
* 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;
|
|
}
|
|
|
|
/*
|
|
* 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);
|
|
}
|
|
|
|
#if defined(CONFIG_NFS_V4_1)
|
|
static int nfs41_callback_up_net(struct svc_serv *serv, struct net *net)
|
|
{
|
|
/*
|
|
* Create an svc_sock for the back channel service that shares the
|
|
* fore channel connection.
|
|
* Returns the input port (0) and sets the svc_serv bc_xprt on success
|
|
*/
|
|
return svc_create_xprt(serv, "tcp-bc", net, PF_INET, 0,
|
|
SVC_SOCK_ANONYMOUS);
|
|
}
|
|
|
|
/*
|
|
* 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);
|
|
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);
|
|
}
|
|
return 0;
|
|
}
|
|
|
|
/*
|
|
* 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);
|
|
if (IS_ERR(rqstp)) {
|
|
svc_xprt_put(serv->sv_bc_xprt);
|
|
serv->sv_bc_xprt = NULL;
|
|
}
|
|
dprintk("--> %s return %d\n", __func__, PTR_ERR_OR_ZERO(rqstp));
|
|
return rqstp;
|
|
}
|
|
|
|
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;
|
|
}
|
|
|
|
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;
|
|
}
|
|
#else
|
|
static int nfs41_callback_up_net(struct svc_serv *serv, struct net *net)
|
|
{
|
|
return 0;
|
|
}
|
|
|
|
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);
|
|
}
|
|
|
|
static inline void nfs_callback_bc_serv(u32 minorversion, struct rpc_xprt *xprt,
|
|
struct svc_serv *serv)
|
|
{
|
|
}
|
|
#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_run(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;
|
|
}
|
|
dprintk("nfs_callback_up: service started\n");
|
|
return 0;
|
|
}
|
|
|
|
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);
|
|
}
|
|
|
|
static int nfs_callback_up_net(int minorversion, struct svc_serv *serv, struct net *net)
|
|
{
|
|
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;
|
|
}
|
|
|
|
switch (minorversion) {
|
|
case 0:
|
|
ret = nfs4_callback_up_net(serv, net);
|
|
break;
|
|
case 1:
|
|
case 2:
|
|
ret = nfs41_callback_up_net(serv, net);
|
|
break;
|
|
default:
|
|
printk(KERN_ERR "NFS: unknown callback version: %d\n",
|
|
minorversion);
|
|
ret = -EINVAL;
|
|
break;
|
|
}
|
|
|
|
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;
|
|
}
|
|
|
|
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, NULL);
|
|
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;
|
|
}
|
|
|
|
/*
|
|
* 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);
|
|
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;
|
|
}
|
|
|
|
/*
|
|
* 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);
|
|
}
|
|
|
|
/* 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;
|
|
|
|
/* 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;
|
|
}
|
|
|
|
/*
|
|
* pg_authenticate method for nfsv4 callback threads.
|
|
*
|
|
* The authflavor has been negotiated, so an incorrect flavor is a server
|
|
* bug. Drop 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_DROP;
|
|
break;
|
|
case RPC_AUTH_GSS:
|
|
/* No RPC_AUTH_GSS support yet in NFSv4.1 */
|
|
if (svc_is_backchannel(rqstp))
|
|
return SVC_DROP;
|
|
}
|
|
return SVC_OK;
|
|
}
|
|
|
|
/*
|
|
* 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,
|
|
};
|