2005-04-16 22:20:36 +00:00
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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/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 09:37:12 +00:00
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#include <linux/mutex.h>
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2007-07-17 11:03:35 +00:00
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#include <linux/freezer.h>
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2008-02-20 13:55:30 +00:00
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#include <linux/kthread.h>
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2008-12-23 21:18:34 +00:00
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#include <linux/sunrpc/svcauth_gss.h>
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2009-04-01 13:23:08 +00:00
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#include <linux/sunrpc/bc_xprt.h>
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2005-12-27 04:43:12 +00:00
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#include <net/inet_sock.h>
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2005-06-22 17:16:21 +00:00
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#include "nfs4_fs.h"
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2005-04-16 22:20:36 +00:00
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#include "callback.h"
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2006-08-23 00:06:10 +00:00
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#include "internal.h"
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2005-04-16 22:20:36 +00:00
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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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2009-04-01 13:23:08 +00:00
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struct svc_serv *serv;
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2008-06-11 14:03:11 +00:00
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struct svc_rqst *rqst;
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2008-02-20 13:55:30 +00:00
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struct task_struct *task;
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2005-04-16 22:20:36 +00:00
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};
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2009-04-01 13:23:14 +00:00
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static struct nfs_callback_data nfs_callback_info[NFS4_MAX_MINOR_VERSION + 1];
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2006-03-26 09:37:12 +00:00
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static DEFINE_MUTEX(nfs_callback_mutex);
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2005-04-16 22:20:36 +00:00
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static struct svc_program nfs4_callback_program;
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2009-03-19 00:48:06 +00:00
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unsigned short nfs_callback_tcpport6;
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2005-04-16 22:20:36 +00:00
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/*
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2009-04-01 13:23:14 +00:00
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* This is the NFSv4 callback kernel thread.
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2005-04-16 22:20:36 +00:00
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*/
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2008-02-20 13:55:30 +00:00
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static int
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2009-04-01 13:22:56 +00:00
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nfs4_callback_svc(void *vrqstp)
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2005-04-16 22:20:36 +00:00
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{
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2008-04-08 19:40:07 +00:00
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int err, preverr = 0;
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2008-02-20 13:55:30 +00:00
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struct svc_rqst *rqstp = vrqstp;
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2005-04-16 22:20:36 +00:00
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2007-07-17 11:03:35 +00:00
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set_freezable();
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2005-04-16 22:20:36 +00:00
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2008-02-20 13:55:30 +00:00
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while (!kthread_should_stop()) {
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2005-04-16 22:20:36 +00:00
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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 09:17:50 +00:00
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err = svc_recv(rqstp, MAX_SCHEDULE_TIMEOUT);
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2008-04-08 19:40:07 +00:00
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if (err == -EAGAIN || err == -EINTR) {
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preverr = err;
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2005-04-16 22:20:36 +00:00
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continue;
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2008-04-08 19:40:07 +00:00
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}
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2005-04-16 22:20:36 +00:00
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if (err < 0) {
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2008-04-08 19:40:07 +00:00
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if (err != preverr) {
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2012-01-26 18:32:23 +00:00
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printk(KERN_WARNING "NFS: %s: unexpected error "
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2008-04-08 19:40:07 +00:00
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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 22:20:36 +00:00
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}
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2008-04-08 19:40:07 +00:00
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preverr = err;
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2006-10-02 09:17:50 +00:00
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svc_process(rqstp);
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2005-04-16 22:20:36 +00:00
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}
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2008-02-20 13:55:30 +00:00
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return 0;
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2005-04-16 22:20:36 +00:00
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}
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/*
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2009-04-01 13:22:56 +00:00
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* Prepare to bring up the NFSv4 callback service
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2005-04-16 22:20:36 +00:00
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*/
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2012-03-11 17:11:00 +00:00
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static struct svc_rqst *
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2012-01-10 12:13:03 +00:00
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nfs4_callback_up(struct svc_serv *serv, struct rpc_xprt *xprt)
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2005-04-16 22:20:36 +00:00
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{
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2009-04-01 13:22:56 +00:00
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int ret;
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2007-02-12 08:53:29 +00:00
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2012-06-01 09:55:47 +00:00
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ret = svc_create_xprt(serv, "tcp", &init_net, PF_INET,
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2009-03-19 00:46:21 +00:00
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nfs_callback_set_tcpport, SVC_SOCK_ANONYMOUS);
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2007-02-12 08:53:29 +00:00
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if (ret <= 0)
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2008-02-11 15:00:20 +00:00
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goto out_err;
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2007-02-12 08:53:29 +00:00
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nfs_callback_tcpport = ret;
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2008-10-16 21:41:11 +00:00
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dprintk("NFS: Callback listener port = %u (af %u)\n",
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2009-03-19 00:46:36 +00:00
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nfs_callback_tcpport, PF_INET);
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2007-02-12 08:53:29 +00:00
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2012-06-01 09:55:47 +00:00
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ret = svc_create_xprt(serv, "tcp", &init_net, PF_INET6,
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2009-03-19 00:48:06 +00:00
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nfs_callback_set_tcpport, SVC_SOCK_ANONYMOUS);
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if (ret > 0) {
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nfs_callback_tcpport6 = ret;
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dprintk("NFS: Callback listener port = %u (af %u)\n",
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nfs_callback_tcpport6, PF_INET6);
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2009-06-18 01:02:10 +00:00
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} else if (ret == -EAFNOSUPPORT)
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ret = 0;
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else
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2009-03-19 00:48:06 +00:00
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goto out_err;
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2011-07-28 18:04:09 +00:00
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return svc_prepare_thread(serv, &serv->sv_pools[0], NUMA_NO_NODE);
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2009-04-01 13:22:56 +00:00
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out_err:
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if (ret == 0)
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ret = -ENOMEM;
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return ERR_PTR(ret);
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}
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2009-04-01 13:23:08 +00:00
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#if defined(CONFIG_NFS_V4_1)
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/*
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* The callback service for NFSv4.1 callbacks
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*/
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static int
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nfs41_callback_svc(void *vrqstp)
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{
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struct svc_rqst *rqstp = vrqstp;
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struct svc_serv *serv = rqstp->rq_server;
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struct rpc_rqst *req;
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int error;
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DEFINE_WAIT(wq);
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set_freezable();
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while (!kthread_should_stop()) {
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prepare_to_wait(&serv->sv_cb_waitq, &wq, TASK_INTERRUPTIBLE);
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spin_lock_bh(&serv->sv_cb_lock);
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if (!list_empty(&serv->sv_cb_list)) {
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req = list_first_entry(&serv->sv_cb_list,
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struct rpc_rqst, rq_bc_list);
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list_del(&req->rq_bc_list);
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spin_unlock_bh(&serv->sv_cb_lock);
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dprintk("Invoking bc_svc_process()\n");
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error = bc_svc_process(serv, req, rqstp);
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dprintk("bc_svc_process() returned w/ error code= %d\n",
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error);
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} else {
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spin_unlock_bh(&serv->sv_cb_lock);
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schedule();
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}
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finish_wait(&serv->sv_cb_waitq, &wq);
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}
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return 0;
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}
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/*
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* Bring up the NFSv4.1 callback service
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*/
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2012-03-11 17:11:00 +00:00
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static struct svc_rqst *
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2009-04-01 13:23:08 +00:00
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nfs41_callback_up(struct svc_serv *serv, struct rpc_xprt *xprt)
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{
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2011-01-06 02:04:28 +00:00
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struct svc_rqst *rqstp;
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int ret;
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2009-04-01 13:23:11 +00:00
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2011-01-06 02:04:28 +00:00
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/*
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* Create an svc_sock for the back channel service that shares the
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* fore channel connection.
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* Returns the input port (0) and sets the svc_serv bc_xprt on success
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*/
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2012-06-01 09:55:47 +00:00
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ret = svc_create_xprt(serv, "tcp-bc", &init_net, PF_INET, 0,
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2011-01-06 02:04:28 +00:00
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SVC_SOCK_ANONYMOUS);
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if (ret < 0) {
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rqstp = ERR_PTR(ret);
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2009-04-01 13:23:11 +00:00
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goto out;
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2011-01-06 02:04:28 +00:00
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}
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2009-04-01 13:23:11 +00:00
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2009-04-01 13:23:08 +00:00
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/*
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* Save the svc_serv in the transport so that it can
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* be referenced when the session backchannel is initialized
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*/
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xprt->bc_serv = serv;
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INIT_LIST_HEAD(&serv->sv_cb_list);
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spin_lock_init(&serv->sv_cb_lock);
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init_waitqueue_head(&serv->sv_cb_waitq);
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2011-07-28 18:04:09 +00:00
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rqstp = svc_prepare_thread(serv, &serv->sv_pools[0], NUMA_NO_NODE);
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2011-01-06 02:04:28 +00:00
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if (IS_ERR(rqstp)) {
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2011-01-06 02:04:35 +00:00
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svc_xprt_put(serv->sv_bc_xprt);
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serv->sv_bc_xprt = NULL;
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2011-01-06 02:04:28 +00:00
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}
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2009-04-01 13:23:11 +00:00
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out:
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2011-01-06 02:04:28 +00:00
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dprintk("--> %s return %ld\n", __func__,
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IS_ERR(rqstp) ? PTR_ERR(rqstp) : 0);
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2009-04-01 13:23:11 +00:00
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return rqstp;
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2009-04-01 13:23:08 +00:00
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}
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static inline int nfs_minorversion_callback_svc_setup(u32 minorversion,
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struct svc_serv *serv, struct rpc_xprt *xprt,
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struct svc_rqst **rqstpp, int (**callback_svc)(void *vrqstp))
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{
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if (minorversion) {
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*rqstpp = nfs41_callback_up(serv, xprt);
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*callback_svc = nfs41_callback_svc;
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}
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return minorversion;
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}
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static inline void nfs_callback_bc_serv(u32 minorversion, struct rpc_xprt *xprt,
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struct nfs_callback_data *cb_info)
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{
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if (minorversion)
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xprt->bc_serv = cb_info->serv;
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}
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#else
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static inline int nfs_minorversion_callback_svc_setup(u32 minorversion,
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struct svc_serv *serv, struct rpc_xprt *xprt,
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struct svc_rqst **rqstpp, int (**callback_svc)(void *vrqstp))
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{
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return 0;
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}
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static inline void nfs_callback_bc_serv(u32 minorversion, struct rpc_xprt *xprt,
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struct nfs_callback_data *cb_info)
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{
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}
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#endif /* CONFIG_NFS_V4_1 */
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|
2009-04-01 13:22:56 +00:00
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/*
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* Bring up the callback thread if it is not already up.
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*/
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int nfs_callback_up(u32 minorversion, struct rpc_xprt *xprt)
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{
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struct svc_serv *serv = NULL;
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struct svc_rqst *rqstp;
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int (*callback_svc)(void *vrqstp);
|
2009-04-01 13:23:14 +00:00
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struct nfs_callback_data *cb_info = &nfs_callback_info[minorversion];
|
2009-04-01 13:22:56 +00:00
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char svc_name[12];
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int ret = 0;
|
2009-04-01 13:23:08 +00:00
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int minorversion_setup;
|
2012-06-01 09:55:47 +00:00
|
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struct net *net = &init_net;
|
2009-04-01 13:22:56 +00:00
|
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mutex_lock(&nfs_callback_mutex);
|
2009-04-01 13:23:14 +00:00
|
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if (cb_info->users++ || cb_info->task != NULL) {
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nfs_callback_bc_serv(minorversion, xprt, cb_info);
|
2009-04-01 13:22:56 +00:00
|
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goto out;
|
2009-04-01 13:23:08 +00:00
|
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}
|
2009-04-01 13:22:56 +00:00
|
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serv = svc_create(&nfs4_callback_program, NFS4_CALLBACK_BUFSIZE, NULL);
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|
|
if (!serv) {
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ret = -ENOMEM;
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|
goto out_err;
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|
|
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}
|
2012-07-31 04:40:12 +00:00
|
|
|
/* As there is only one thread we need to over-ride the
|
|
|
|
* default maximum of 80 connections
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|
|
|
*/
|
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|
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serv->sv_maxconn = 1024;
|
2009-04-01 13:22:56 +00:00
|
|
|
|
2012-05-02 12:08:38 +00:00
|
|
|
ret = svc_bind(serv, net);
|
|
|
|
if (ret < 0) {
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|
|
|
printk(KERN_WARNING "NFS: bind callback service failed\n");
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|
|
goto out_err;
|
|
|
|
}
|
|
|
|
|
2009-04-01 13:23:08 +00:00
|
|
|
minorversion_setup = nfs_minorversion_callback_svc_setup(minorversion,
|
|
|
|
serv, xprt, &rqstp, &callback_svc);
|
|
|
|
if (!minorversion_setup) {
|
|
|
|
/* v4.0 callback setup */
|
2012-01-10 12:13:03 +00:00
|
|
|
rqstp = nfs4_callback_up(serv, xprt);
|
2009-04-01 13:22:56 +00:00
|
|
|
callback_svc = nfs4_callback_svc;
|
|
|
|
}
|
|
|
|
|
|
|
|
if (IS_ERR(rqstp)) {
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|
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ret = PTR_ERR(rqstp);
|
2008-02-11 15:00:20 +00:00
|
|
|
goto out_err;
|
2008-02-20 13:55:30 +00:00
|
|
|
}
|
|
|
|
|
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|
|
svc_sock_update_bufs(serv);
|
|
|
|
|
2009-04-01 13:22:56 +00:00
|
|
|
sprintf(svc_name, "nfsv4.%u-svc", minorversion);
|
2009-04-01 13:23:14 +00:00
|
|
|
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;
|
2008-02-20 13:55:30 +00:00
|
|
|
goto out_err;
|
|
|
|
}
|
2005-04-16 22:20:36 +00:00
|
|
|
out:
|
2008-02-11 15:00:20 +00:00
|
|
|
/*
|
|
|
|
* svc_create creates the svc_serv with sv_nrthreads == 1, and then
|
2008-02-20 13:55:30 +00:00
|
|
|
* svc_prepare_thread increments that. So we need to call svc_destroy
|
2008-02-11 15:00:20 +00:00
|
|
|
* on both success and failure so that the refcount is 1 when the
|
|
|
|
* thread exits.
|
|
|
|
*/
|
|
|
|
if (serv)
|
|
|
|
svc_destroy(serv);
|
2006-03-26 09:37:12 +00:00
|
|
|
mutex_unlock(&nfs_callback_mutex);
|
2005-04-16 22:20:36 +00:00
|
|
|
return ret;
|
2008-02-11 15:00:20 +00:00
|
|
|
out_err:
|
2008-10-16 21:41:11 +00:00
|
|
|
dprintk("NFS: Couldn't create callback socket or server thread; "
|
|
|
|
"err = %d\n", ret);
|
2009-04-01 13:23:14 +00:00
|
|
|
cb_info->users--;
|
2012-05-04 08:49:41 +00:00
|
|
|
if (serv)
|
|
|
|
svc_shutdown_net(serv, net);
|
2005-04-16 22:20:36 +00:00
|
|
|
goto out;
|
|
|
|
}
|
|
|
|
|
|
|
|
/*
|
2008-06-11 14:03:11 +00:00
|
|
|
* Kill the callback thread if it's no longer being used.
|
2005-04-16 22:20:36 +00:00
|
|
|
*/
|
2012-08-20 14:00:06 +00:00
|
|
|
void nfs_callback_down(int minorversion, struct net *net)
|
2005-04-16 22:20:36 +00:00
|
|
|
{
|
2009-04-01 13:23:14 +00:00
|
|
|
struct nfs_callback_data *cb_info = &nfs_callback_info[minorversion];
|
|
|
|
|
2006-03-26 09:37:12 +00:00
|
|
|
mutex_lock(&nfs_callback_mutex);
|
2009-04-01 13:23:14 +00:00
|
|
|
cb_info->users--;
|
|
|
|
if (cb_info->users == 0 && cb_info->task != NULL) {
|
|
|
|
kthread_stop(cb_info->task);
|
2012-08-20 14:00:06 +00:00
|
|
|
svc_shutdown_net(cb_info->serv, net);
|
2009-04-01 13:23:14 +00:00
|
|
|
svc_exit_thread(cb_info->rqst);
|
|
|
|
cb_info->serv = NULL;
|
|
|
|
cb_info->rqst = NULL;
|
|
|
|
cb_info->task = NULL;
|
2008-06-11 14:03:11 +00:00
|
|
|
}
|
2006-03-26 09:37:12 +00:00
|
|
|
mutex_unlock(&nfs_callback_mutex);
|
2005-04-16 22:20:36 +00:00
|
|
|
}
|
|
|
|
|
2011-01-25 15:38:01 +00:00
|
|
|
/* Boolean check of RPC_AUTH_GSS principal */
|
|
|
|
int
|
|
|
|
check_gss_callback_principal(struct nfs_client *clp, struct svc_rqst *rqstp)
|
2008-12-23 21:18:34 +00:00
|
|
|
{
|
2012-05-14 23:55:22 +00:00
|
|
|
char *p = rqstp->rq_cred.cr_principal;
|
2008-12-23 21:18:34 +00:00
|
|
|
|
2011-01-25 15:38:01 +00:00
|
|
|
if (rqstp->rq_authop->flavour != RPC_AUTH_GSS)
|
|
|
|
return 1;
|
|
|
|
|
2011-01-06 02:04:33 +00:00
|
|
|
/* No RPC_AUTH_GSS on NFSv4.1 back channel yet */
|
|
|
|
if (clp->cl_minorversion != 0)
|
2011-01-25 15:38:01 +00:00
|
|
|
return 0;
|
2008-12-23 21:18:34 +00:00
|
|
|
/*
|
|
|
|
* 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)
|
2011-01-25 15:38:01 +00:00
|
|
|
return 0;
|
2008-12-23 21:18:34 +00:00
|
|
|
|
|
|
|
/* Expect a GSS_C_NT_HOSTBASED_NAME like "nfs@serverhostname" */
|
|
|
|
|
|
|
|
if (memcmp(p, "nfs@", 4) != 0)
|
2011-01-25 15:38:01 +00:00
|
|
|
return 0;
|
2008-12-23 21:18:34 +00:00
|
|
|
p += 4;
|
2012-03-01 22:01:05 +00:00
|
|
|
if (strcmp(p, clp->cl_hostname) != 0)
|
2011-01-25 15:38:01 +00:00
|
|
|
return 0;
|
|
|
|
return 1;
|
2008-12-23 21:18:34 +00:00
|
|
|
}
|
|
|
|
|
2011-01-25 15:38:01 +00:00
|
|
|
/*
|
|
|
|
* 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
|
|
|
|
*/
|
2005-04-16 22:20:36 +00:00
|
|
|
static int nfs_callback_authenticate(struct svc_rqst *rqstp)
|
|
|
|
{
|
|
|
|
switch (rqstp->rq_authop->flavour) {
|
2011-01-25 15:38:01 +00:00
|
|
|
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;
|
2005-04-16 22:20:36 +00:00
|
|
|
}
|
2011-01-25 15:38:01 +00:00
|
|
|
return SVC_OK;
|
2005-04-16 22:20:36 +00:00
|
|
|
}
|
|
|
|
|
|
|
|
/*
|
|
|
|
* Define NFS4 callback program
|
|
|
|
*/
|
|
|
|
static struct svc_version *nfs4_callback_version[] = {
|
|
|
|
[1] = &nfs4_callback_version1,
|
2009-12-05 18:19:01 +00:00
|
|
|
[4] = &nfs4_callback_version4,
|
2005-04-16 22:20:36 +00:00
|
|
|
};
|
|
|
|
|
|
|
|
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,
|
|
|
|
};
|