mirror of
https://github.com/AuxXxilium/linux_dsm_epyc7002.git
synced 2024-12-05 23:56:39 +07:00
03a4e1f6dd
Instead of keeping the principal name associated with a request in a structure that's private to auth_gss and using an accessor function, move it to svc_cred. Signed-off-by: J. Bruce Fields <bfields@redhat.com>
414 lines
10 KiB
C
414 lines
10 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/mutex.h>
|
|
#include <linux/freezer.h>
|
|
#include <linux/kthread.h>
|
|
#include <linux/sunrpc/svcauth_gss.h>
|
|
#include <linux/sunrpc/bc_xprt.h>
|
|
#include <linux/nsproxy.h>
|
|
|
|
#include <net/inet_sock.h>
|
|
|
|
#include "nfs4_fs.h"
|
|
#include "callback.h"
|
|
#include "internal.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;
|
|
|
|
unsigned int nfs_callback_set_tcpport;
|
|
unsigned short nfs_callback_tcpport;
|
|
unsigned short nfs_callback_tcpport6;
|
|
#define NFS_CALLBACK_MAXPORTNR (65535U)
|
|
|
|
static int param_set_portnr(const char *val, const struct kernel_param *kp)
|
|
{
|
|
unsigned long num;
|
|
int ret;
|
|
|
|
if (!val)
|
|
return -EINVAL;
|
|
ret = strict_strtoul(val, 0, &num);
|
|
if (ret == -EINVAL || num > NFS_CALLBACK_MAXPORTNR)
|
|
return -EINVAL;
|
|
*((unsigned int *)kp->arg) = num;
|
|
return 0;
|
|
}
|
|
static struct kernel_param_ops param_ops_portnr = {
|
|
.set = param_set_portnr,
|
|
.get = param_get_uint,
|
|
};
|
|
#define param_check_portnr(name, p) __param_check(name, p, unsigned int);
|
|
|
|
module_param_named(callback_tcpport, nfs_callback_set_tcpport, portnr, 0644);
|
|
|
|
/*
|
|
* This is the NFSv4 callback kernel thread.
|
|
*/
|
|
static int
|
|
nfs4_callback_svc(void *vrqstp)
|
|
{
|
|
int err, preverr = 0;
|
|
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) {
|
|
preverr = err;
|
|
continue;
|
|
}
|
|
if (err < 0) {
|
|
if (err != preverr) {
|
|
printk(KERN_WARNING "NFS: %s: unexpected error "
|
|
"from svc_recv (%d)\n", __func__, err);
|
|
preverr = err;
|
|
}
|
|
schedule_timeout_uninterruptible(HZ);
|
|
continue;
|
|
}
|
|
preverr = err;
|
|
svc_process(rqstp);
|
|
}
|
|
return 0;
|
|
}
|
|
|
|
/*
|
|
* Prepare to bring up the NFSv4 callback service
|
|
*/
|
|
static struct svc_rqst *
|
|
nfs4_callback_up(struct svc_serv *serv, struct rpc_xprt *xprt)
|
|
{
|
|
int ret;
|
|
|
|
ret = svc_create_xprt(serv, "tcp", xprt->xprt_net, PF_INET,
|
|
nfs_callback_set_tcpport, SVC_SOCK_ANONYMOUS);
|
|
if (ret <= 0)
|
|
goto out_err;
|
|
nfs_callback_tcpport = ret;
|
|
dprintk("NFS: Callback listener port = %u (af %u)\n",
|
|
nfs_callback_tcpport, PF_INET);
|
|
|
|
ret = svc_create_xprt(serv, "tcp", xprt->xprt_net, PF_INET6,
|
|
nfs_callback_set_tcpport, SVC_SOCK_ANONYMOUS);
|
|
if (ret > 0) {
|
|
nfs_callback_tcpport6 = ret;
|
|
dprintk("NFS: Callback listener port = %u (af %u)\n",
|
|
nfs_callback_tcpport6, PF_INET6);
|
|
} else if (ret == -EAFNOSUPPORT)
|
|
ret = 0;
|
|
else
|
|
goto out_err;
|
|
|
|
return svc_prepare_thread(serv, &serv->sv_pools[0], NUMA_NO_NODE);
|
|
|
|
out_err:
|
|
if (ret == 0)
|
|
ret = -ENOMEM;
|
|
return ERR_PTR(ret);
|
|
}
|
|
|
|
#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()) {
|
|
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 rpc_xprt *xprt)
|
|
{
|
|
struct svc_rqst *rqstp;
|
|
int ret;
|
|
|
|
/*
|
|
* 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
|
|
*/
|
|
ret = svc_create_xprt(serv, "tcp-bc", xprt->xprt_net, PF_INET, 0,
|
|
SVC_SOCK_ANONYMOUS);
|
|
if (ret < 0) {
|
|
rqstp = ERR_PTR(ret);
|
|
goto out;
|
|
}
|
|
|
|
/*
|
|
* Save the svc_serv in the transport so that it can
|
|
* be referenced when the session backchannel is initialized
|
|
*/
|
|
xprt->bc_serv = serv;
|
|
|
|
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;
|
|
}
|
|
out:
|
|
dprintk("--> %s return %ld\n", __func__,
|
|
IS_ERR(rqstp) ? PTR_ERR(rqstp) : 0);
|
|
return rqstp;
|
|
}
|
|
|
|
static inline int nfs_minorversion_callback_svc_setup(u32 minorversion,
|
|
struct svc_serv *serv, struct rpc_xprt *xprt,
|
|
struct svc_rqst **rqstpp, int (**callback_svc)(void *vrqstp))
|
|
{
|
|
if (minorversion) {
|
|
*rqstpp = nfs41_callback_up(serv, xprt);
|
|
*callback_svc = nfs41_callback_svc;
|
|
}
|
|
return minorversion;
|
|
}
|
|
|
|
static inline void nfs_callback_bc_serv(u32 minorversion, struct rpc_xprt *xprt,
|
|
struct nfs_callback_data *cb_info)
|
|
{
|
|
if (minorversion)
|
|
xprt->bc_serv = cb_info->serv;
|
|
}
|
|
#else
|
|
static inline int nfs_minorversion_callback_svc_setup(u32 minorversion,
|
|
struct svc_serv *serv, struct rpc_xprt *xprt,
|
|
struct svc_rqst **rqstpp, int (**callback_svc)(void *vrqstp))
|
|
{
|
|
return 0;
|
|
}
|
|
|
|
static inline void nfs_callback_bc_serv(u32 minorversion, struct rpc_xprt *xprt,
|
|
struct nfs_callback_data *cb_info)
|
|
{
|
|
}
|
|
#endif /* CONFIG_NFS_V4_1 */
|
|
|
|
/*
|
|
* 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 = NULL;
|
|
struct svc_rqst *rqstp;
|
|
int (*callback_svc)(void *vrqstp);
|
|
struct nfs_callback_data *cb_info = &nfs_callback_info[minorversion];
|
|
char svc_name[12];
|
|
int ret = 0;
|
|
int minorversion_setup;
|
|
struct net *net = current->nsproxy->net_ns;
|
|
|
|
mutex_lock(&nfs_callback_mutex);
|
|
if (cb_info->users++ || cb_info->task != NULL) {
|
|
nfs_callback_bc_serv(minorversion, xprt, cb_info);
|
|
goto out;
|
|
}
|
|
serv = svc_create(&nfs4_callback_program, NFS4_CALLBACK_BUFSIZE, NULL);
|
|
if (!serv) {
|
|
ret = -ENOMEM;
|
|
goto out_err;
|
|
}
|
|
|
|
ret = svc_bind(serv, net);
|
|
if (ret < 0) {
|
|
printk(KERN_WARNING "NFS: bind callback service failed\n");
|
|
goto out_err;
|
|
}
|
|
|
|
minorversion_setup = nfs_minorversion_callback_svc_setup(minorversion,
|
|
serv, xprt, &rqstp, &callback_svc);
|
|
if (!minorversion_setup) {
|
|
/* v4.0 callback setup */
|
|
rqstp = nfs4_callback_up(serv, xprt);
|
|
callback_svc = nfs4_callback_svc;
|
|
}
|
|
|
|
if (IS_ERR(rqstp)) {
|
|
ret = PTR_ERR(rqstp);
|
|
goto out_err;
|
|
}
|
|
|
|
svc_sock_update_bufs(serv);
|
|
|
|
sprintf(svc_name, "nfsv4.%u-svc", minorversion);
|
|
cb_info->serv = serv;
|
|
cb_info->rqst = rqstp;
|
|
cb_info->task = kthread_run(callback_svc, cb_info->rqst, svc_name);
|
|
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;
|
|
goto out_err;
|
|
}
|
|
out:
|
|
/*
|
|
* 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.
|
|
*/
|
|
if (serv)
|
|
svc_destroy(serv);
|
|
mutex_unlock(&nfs_callback_mutex);
|
|
return ret;
|
|
out_err:
|
|
dprintk("NFS: Couldn't create callback socket or server thread; "
|
|
"err = %d\n", ret);
|
|
cb_info->users--;
|
|
if (serv)
|
|
svc_shutdown_net(serv, net);
|
|
goto out;
|
|
}
|
|
|
|
/*
|
|
* Kill the callback thread if it's no longer being used.
|
|
*/
|
|
void nfs_callback_down(int minorversion)
|
|
{
|
|
struct nfs_callback_data *cb_info = &nfs_callback_info[minorversion];
|
|
|
|
mutex_lock(&nfs_callback_mutex);
|
|
cb_info->users--;
|
|
if (cb_info->users == 0 && cb_info->task != NULL) {
|
|
kthread_stop(cb_info->task);
|
|
svc_shutdown_net(cb_info->serv, current->nsproxy->net_ns);
|
|
svc_exit_thread(cb_info->rqst);
|
|
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,
|
|
};
|