2005-04-16 16:20:36 -06:00
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/*
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* linux/fs/nfs/callback.c
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*
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* Copyright (C) 2004 Trond Myklebust
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*
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* NFSv4 callback handling
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*/
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#include <linux/completion.h>
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#include <linux/ip.h>
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#include <linux/module.h>
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#include <linux/smp_lock.h>
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#include <linux/sunrpc/svc.h>
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#include <linux/sunrpc/svcsock.h>
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#include <linux/nfs_fs.h>
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2006-03-26 02:37:12 -07:00
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#include <linux/mutex.h>
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2007-07-17 05:03:35 -06:00
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#include <linux/freezer.h>
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2008-02-20 06:55:30 -07:00
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#include <linux/kthread.h>
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2005-12-26 21:43:12 -07:00
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#include <net/inet_sock.h>
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2005-06-22 11:16:21 -06:00
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#include "nfs4_fs.h"
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2005-04-16 16:20:36 -06:00
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#include "callback.h"
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2006-08-22 18:06:10 -06:00
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#include "internal.h"
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2005-04-16 16:20:36 -06:00
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#define NFSDBG_FACILITY NFSDBG_CALLBACK
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struct nfs_callback_data {
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unsigned int users;
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struct svc_serv *serv;
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2008-02-20 06:55:30 -07:00
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struct task_struct *task;
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2005-04-16 16:20:36 -06:00
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};
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static struct nfs_callback_data nfs_callback_info;
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2006-03-26 02:37:12 -07:00
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static DEFINE_MUTEX(nfs_callback_mutex);
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2005-04-16 16:20:36 -06:00
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static struct svc_program nfs4_callback_program;
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2006-01-03 01:55:41 -07:00
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unsigned int nfs_callback_set_tcpport;
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2005-04-16 16:20:36 -06:00
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unsigned short nfs_callback_tcpport;
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2006-08-22 18:06:07 -06:00
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static const int nfs_set_port_min = 0;
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static const int nfs_set_port_max = 65535;
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static int param_set_port(const char *val, struct kernel_param *kp)
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{
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char *endp;
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int num = simple_strtol(val, &endp, 0);
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if (endp == val || *endp || num < nfs_set_port_min || num > nfs_set_port_max)
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return -EINVAL;
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*((int *)kp->arg) = num;
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return 0;
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}
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module_param_call(callback_tcpport, param_set_port, param_get_int,
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&nfs_callback_set_tcpport, 0644);
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2005-04-16 16:20:36 -06:00
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/*
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* This is the callback kernel thread.
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*/
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2008-02-20 06:55:30 -07:00
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static int
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nfs_callback_svc(void *vrqstp)
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2005-04-16 16:20:36 -06:00
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{
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2008-04-08 13:40:07 -06:00
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int err, preverr = 0;
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2008-02-20 06:55:30 -07:00
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struct svc_rqst *rqstp = vrqstp;
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2005-04-16 16:20:36 -06:00
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2007-07-17 05:03:35 -06:00
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set_freezable();
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2005-04-16 16:20:36 -06:00
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2008-02-20 06:55:30 -07:00
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/*
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* FIXME: do we really need to run this under the BKL? If so, please
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* add a comment about what it's intended to protect.
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*/
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lock_kernel();
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while (!kthread_should_stop()) {
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2005-04-16 16:20:36 -06:00
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/*
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* Listen for a request on the socket
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*/
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2006-10-02 03:17:50 -06:00
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err = svc_recv(rqstp, MAX_SCHEDULE_TIMEOUT);
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2008-04-08 13:40:07 -06:00
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if (err == -EAGAIN || err == -EINTR) {
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preverr = err;
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2005-04-16 16:20:36 -06:00
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continue;
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2008-04-08 13:40:07 -06:00
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}
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2005-04-16 16:20:36 -06:00
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if (err < 0) {
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2008-04-08 13:40:07 -06:00
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if (err != preverr) {
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printk(KERN_WARNING "%s: unexpected error "
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"from svc_recv (%d)\n", __func__, err);
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preverr = err;
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}
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schedule_timeout_uninterruptible(HZ);
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continue;
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2005-04-16 16:20:36 -06:00
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}
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2008-04-08 13:40:07 -06:00
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preverr = err;
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2006-10-02 03:17:50 -06:00
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svc_process(rqstp);
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2005-04-16 16:20:36 -06:00
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}
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unlock_kernel();
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2008-02-20 06:55:30 -07:00
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nfs_callback_info.task = NULL;
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svc_exit_thread(rqstp);
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return 0;
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2005-04-16 16:20:36 -06:00
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}
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/*
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* Bring up the server process if it is not already up.
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*/
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int nfs_callback_up(void)
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{
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2008-02-11 08:00:20 -07:00
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struct svc_serv *serv = NULL;
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2008-02-20 06:55:30 -07:00
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struct svc_rqst *rqstp;
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2005-04-16 16:20:36 -06:00
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int ret = 0;
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lock_kernel();
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2006-03-26 02:37:12 -07:00
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mutex_lock(&nfs_callback_mutex);
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2008-02-20 06:55:30 -07:00
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if (nfs_callback_info.users++ || nfs_callback_info.task != NULL)
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2005-04-16 16:20:36 -06:00
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goto out;
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2006-10-02 03:17:44 -06:00
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serv = svc_create(&nfs4_callback_program, NFS4_CALLBACK_BUFSIZE, NULL);
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2005-04-16 16:20:36 -06:00
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ret = -ENOMEM;
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if (!serv)
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goto out_err;
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2007-02-12 01:53:29 -07:00
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2007-12-30 20:07:44 -07:00
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ret = svc_create_xprt(serv, "tcp", nfs_callback_set_tcpport,
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SVC_SOCK_ANONYMOUS);
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2007-02-12 01:53:29 -07:00
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if (ret <= 0)
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2008-02-11 08:00:20 -07:00
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goto out_err;
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2007-02-12 01:53:29 -07:00
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nfs_callback_tcpport = ret;
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dprintk("Callback port = 0x%x\n", nfs_callback_tcpport);
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2008-02-20 06:55:30 -07:00
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rqstp = svc_prepare_thread(serv, &serv->sv_pools[0]);
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if (IS_ERR(rqstp)) {
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ret = PTR_ERR(rqstp);
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2008-02-11 08:00:20 -07:00
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goto out_err;
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2008-02-20 06:55:30 -07:00
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}
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svc_sock_update_bufs(serv);
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2005-04-16 16:20:36 -06:00
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nfs_callback_info.serv = serv;
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2008-02-20 06:55:30 -07:00
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nfs_callback_info.task = kthread_run(nfs_callback_svc, rqstp,
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"nfsv4-svc");
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if (IS_ERR(nfs_callback_info.task)) {
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ret = PTR_ERR(nfs_callback_info.task);
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nfs_callback_info.serv = NULL;
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nfs_callback_info.task = NULL;
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svc_exit_thread(rqstp);
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goto out_err;
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}
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2005-04-16 16:20:36 -06:00
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out:
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2008-02-11 08:00:20 -07:00
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/*
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* svc_create creates the svc_serv with sv_nrthreads == 1, and then
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2008-02-20 06:55:30 -07:00
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* svc_prepare_thread increments that. So we need to call svc_destroy
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2008-02-11 08:00:20 -07:00
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* on both success and failure so that the refcount is 1 when the
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* thread exits.
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*/
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if (serv)
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svc_destroy(serv);
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2006-03-26 02:37:12 -07:00
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mutex_unlock(&nfs_callback_mutex);
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2005-04-16 16:20:36 -06:00
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unlock_kernel();
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return ret;
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2008-02-11 08:00:20 -07:00
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out_err:
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2007-02-12 01:53:29 -07:00
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dprintk("Couldn't create callback socket or server thread; err = %d\n",
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ret);
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2005-04-16 16:20:36 -06:00
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nfs_callback_info.users--;
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goto out;
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}
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/*
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2008-04-07 11:09:47 -06:00
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* Kill the server process if it is not already down.
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2005-04-16 16:20:36 -06:00
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*/
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2006-08-22 18:06:08 -06:00
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void nfs_callback_down(void)
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2005-04-16 16:20:36 -06:00
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{
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lock_kernel();
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2006-03-26 02:37:12 -07:00
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mutex_lock(&nfs_callback_mutex);
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2006-03-20 11:44:49 -07:00
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nfs_callback_info.users--;
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2008-02-20 06:55:30 -07:00
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if (nfs_callback_info.users == 0 && nfs_callback_info.task != NULL)
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kthread_stop(nfs_callback_info.task);
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2006-03-26 02:37:12 -07:00
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mutex_unlock(&nfs_callback_mutex);
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2005-04-16 16:20:36 -06:00
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unlock_kernel();
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}
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static int nfs_callback_authenticate(struct svc_rqst *rqstp)
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{
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2006-08-22 18:06:08 -06:00
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struct nfs_client *clp;
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2008-02-21 00:57:45 -07:00
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RPC_IFDEBUG(char buf[RPC_MAX_ADDRBUFLEN]);
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2005-04-16 16:20:36 -06:00
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/* Don't talk to strangers */
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2007-12-10 12:58:44 -07:00
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clp = nfs_find_client(svc_addr(rqstp), 4);
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2005-04-16 16:20:36 -06:00
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if (clp == NULL)
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return SVC_DROP;
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2007-02-12 01:53:32 -07:00
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2008-05-02 14:42:44 -06:00
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dprintk("%s: %s NFSv4 callback!\n", __func__,
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2007-02-12 01:53:32 -07:00
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svc_print_addr(rqstp, buf, sizeof(buf)));
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2006-08-22 18:06:10 -06:00
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nfs_put_client(clp);
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2007-02-12 01:53:32 -07:00
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2005-04-16 16:20:36 -06:00
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switch (rqstp->rq_authop->flavour) {
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case RPC_AUTH_NULL:
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if (rqstp->rq_proc != CB_NULL)
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return SVC_DENIED;
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break;
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case RPC_AUTH_UNIX:
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break;
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case RPC_AUTH_GSS:
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/* FIXME: RPCSEC_GSS handling? */
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default:
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return SVC_DENIED;
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}
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return SVC_OK;
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}
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/*
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* Define NFS4 callback program
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*/
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static struct svc_version *nfs4_callback_version[] = {
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[1] = &nfs4_callback_version1,
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};
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static struct svc_stat nfs4_callback_stats;
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static struct svc_program nfs4_callback_program = {
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.pg_prog = NFS4_CALLBACK, /* RPC service number */
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.pg_nvers = ARRAY_SIZE(nfs4_callback_version), /* Number of entries */
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.pg_vers = nfs4_callback_version, /* version table */
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.pg_name = "NFSv4 callback", /* service name */
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.pg_class = "nfs", /* authentication class */
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.pg_stats = &nfs4_callback_stats,
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.pg_authenticate = nfs_callback_authenticate,
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};
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