mirror of https://gitee.com/openkylin/linux.git
466 lines
11 KiB
C
466 lines
11 KiB
C
// SPDX-License-Identifier: GPL-2.0
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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/sched/signal.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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#include <linux/errno.h>
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#include <linux/mutex.h>
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#include <linux/freezer.h>
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#include <linux/kthread.h>
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#include <linux/sunrpc/svcauth_gss.h>
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#include <linux/sunrpc/bc_xprt.h>
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#include <net/inet_sock.h>
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#include "nfs4_fs.h"
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#include "callback.h"
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#include "internal.h"
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#include "netns.h"
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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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};
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static struct nfs_callback_data nfs_callback_info[NFS4_MAX_MINOR_VERSION + 1];
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static DEFINE_MUTEX(nfs_callback_mutex);
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static struct svc_program nfs4_callback_program;
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static int nfs4_callback_up_net(struct svc_serv *serv, struct net *net)
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{
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const struct cred *cred = current_cred();
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int ret;
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struct nfs_net *nn = net_generic(net, nfs_net_id);
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ret = svc_create_xprt(serv, "tcp", net, PF_INET,
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nfs_callback_set_tcpport, SVC_SOCK_ANONYMOUS,
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cred);
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if (ret <= 0)
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goto out_err;
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nn->nfs_callback_tcpport = ret;
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dprintk("NFS: Callback listener port = %u (af %u, net %x)\n",
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nn->nfs_callback_tcpport, PF_INET, net->ns.inum);
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ret = svc_create_xprt(serv, "tcp", net, PF_INET6,
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nfs_callback_set_tcpport, SVC_SOCK_ANONYMOUS,
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cred);
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if (ret > 0) {
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nn->nfs_callback_tcpport6 = ret;
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dprintk("NFS: Callback listener port = %u (af %u, net %x)\n",
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nn->nfs_callback_tcpport6, PF_INET6, net->ns.inum);
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} else if (ret != -EAFNOSUPPORT)
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goto out_err;
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return 0;
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out_err:
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return (ret) ? ret : -ENOMEM;
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}
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/*
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* This is the NFSv4 callback kernel thread.
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*/
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static int
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nfs4_callback_svc(void *vrqstp)
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{
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int err;
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struct svc_rqst *rqstp = vrqstp;
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set_freezable();
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while (!kthread_freezable_should_stop(NULL)) {
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if (signal_pending(current))
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flush_signals(current);
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/*
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* Listen for a request on the socket
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*/
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err = svc_recv(rqstp, MAX_SCHEDULE_TIMEOUT);
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if (err == -EAGAIN || err == -EINTR)
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continue;
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svc_process(rqstp);
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}
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svc_exit_thread(rqstp);
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module_put_and_exit(0);
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return 0;
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}
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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_freezable_should_stop(NULL)) {
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if (signal_pending(current))
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flush_signals(current);
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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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finish_wait(&serv->sv_cb_waitq, &wq);
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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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if (!kthread_should_stop())
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schedule();
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finish_wait(&serv->sv_cb_waitq, &wq);
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}
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}
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svc_exit_thread(rqstp);
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module_put_and_exit(0);
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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 svc_serv *serv)
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{
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if (minorversion)
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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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}
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#else
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static inline void nfs_callback_bc_serv(u32 minorversion, struct rpc_xprt *xprt,
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struct svc_serv *serv)
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{
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}
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#endif /* CONFIG_NFS_V4_1 */
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static int nfs_callback_start_svc(int minorversion, struct rpc_xprt *xprt,
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struct svc_serv *serv)
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{
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int nrservs = nfs_callback_nr_threads;
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int ret;
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nfs_callback_bc_serv(minorversion, xprt, serv);
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if (nrservs < NFS4_MIN_NR_CALLBACK_THREADS)
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nrservs = NFS4_MIN_NR_CALLBACK_THREADS;
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if (serv->sv_nrthreads-1 == nrservs)
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return 0;
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ret = serv->sv_ops->svo_setup(serv, NULL, nrservs);
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if (ret) {
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serv->sv_ops->svo_setup(serv, NULL, 0);
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return ret;
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}
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dprintk("nfs_callback_up: service started\n");
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return 0;
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}
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static void nfs_callback_down_net(u32 minorversion, struct svc_serv *serv, struct net *net)
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{
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struct nfs_net *nn = net_generic(net, nfs_net_id);
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if (--nn->cb_users[minorversion])
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return;
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dprintk("NFS: destroy per-net callback data; net=%x\n", net->ns.inum);
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svc_shutdown_net(serv, net);
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}
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static int nfs_callback_up_net(int minorversion, struct svc_serv *serv,
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struct net *net, struct rpc_xprt *xprt)
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{
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struct nfs_net *nn = net_generic(net, nfs_net_id);
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int ret;
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if (nn->cb_users[minorversion]++)
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return 0;
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dprintk("NFS: create per-net callback data; net=%x\n", net->ns.inum);
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ret = svc_bind(serv, net);
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if (ret < 0) {
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printk(KERN_WARNING "NFS: bind callback service failed\n");
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goto err_bind;
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}
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ret = 0;
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if (!IS_ENABLED(CONFIG_NFS_V4_1) || minorversion == 0)
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ret = nfs4_callback_up_net(serv, net);
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else if (xprt->ops->bc_setup)
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set_bc_enabled(serv);
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else
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ret = -EPROTONOSUPPORT;
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if (ret < 0) {
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printk(KERN_ERR "NFS: callback service start failed\n");
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goto err_socks;
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}
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return 0;
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err_socks:
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svc_rpcb_cleanup(serv, net);
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err_bind:
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nn->cb_users[minorversion]--;
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dprintk("NFS: Couldn't create callback socket: err = %d; "
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"net = %x\n", ret, net->ns.inum);
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return ret;
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}
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static const struct svc_serv_ops nfs40_cb_sv_ops = {
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.svo_function = nfs4_callback_svc,
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.svo_enqueue_xprt = svc_xprt_do_enqueue,
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.svo_setup = svc_set_num_threads_sync,
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.svo_module = THIS_MODULE,
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};
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#if defined(CONFIG_NFS_V4_1)
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static const struct svc_serv_ops nfs41_cb_sv_ops = {
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.svo_function = nfs41_callback_svc,
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.svo_enqueue_xprt = svc_xprt_do_enqueue,
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.svo_setup = svc_set_num_threads_sync,
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.svo_module = THIS_MODULE,
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};
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static const struct svc_serv_ops *nfs4_cb_sv_ops[] = {
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[0] = &nfs40_cb_sv_ops,
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[1] = &nfs41_cb_sv_ops,
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};
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#else
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static const struct svc_serv_ops *nfs4_cb_sv_ops[] = {
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[0] = &nfs40_cb_sv_ops,
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[1] = NULL,
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};
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#endif
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static struct svc_serv *nfs_callback_create_svc(int minorversion)
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{
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struct nfs_callback_data *cb_info = &nfs_callback_info[minorversion];
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const struct svc_serv_ops *sv_ops;
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struct svc_serv *serv;
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/*
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* Check whether we're already up and running.
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*/
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if (cb_info->serv) {
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/*
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* Note: increase service usage, because later in case of error
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* svc_destroy() will be called.
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*/
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svc_get(cb_info->serv);
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return cb_info->serv;
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}
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switch (minorversion) {
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case 0:
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sv_ops = nfs4_cb_sv_ops[0];
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break;
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default:
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sv_ops = nfs4_cb_sv_ops[1];
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}
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if (sv_ops == NULL)
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return ERR_PTR(-ENOTSUPP);
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/*
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* Sanity check: if there's no task,
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* we should be the first user ...
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*/
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if (cb_info->users)
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printk(KERN_WARNING "nfs_callback_create_svc: no kthread, %d users??\n",
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cb_info->users);
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serv = svc_create_pooled(&nfs4_callback_program, NFS4_CALLBACK_BUFSIZE, sv_ops);
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if (!serv) {
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printk(KERN_ERR "nfs_callback_create_svc: create service failed\n");
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return ERR_PTR(-ENOMEM);
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}
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cb_info->serv = serv;
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/* As there is only one thread we need to over-ride the
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* default maximum of 80 connections
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*/
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serv->sv_maxconn = 1024;
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dprintk("nfs_callback_create_svc: service created\n");
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return serv;
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}
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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;
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struct nfs_callback_data *cb_info = &nfs_callback_info[minorversion];
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int ret;
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struct net *net = xprt->xprt_net;
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mutex_lock(&nfs_callback_mutex);
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serv = nfs_callback_create_svc(minorversion);
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if (IS_ERR(serv)) {
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ret = PTR_ERR(serv);
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goto err_create;
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}
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ret = nfs_callback_up_net(minorversion, serv, net, xprt);
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if (ret < 0)
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goto err_net;
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ret = nfs_callback_start_svc(minorversion, xprt, serv);
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if (ret < 0)
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goto err_start;
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cb_info->users++;
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/*
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* svc_create creates the svc_serv with sv_nrthreads == 1, and then
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* svc_prepare_thread increments that. So we need to call svc_destroy
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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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err_net:
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if (!cb_info->users)
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cb_info->serv = NULL;
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svc_destroy(serv);
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err_create:
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mutex_unlock(&nfs_callback_mutex);
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return ret;
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err_start:
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nfs_callback_down_net(minorversion, serv, net);
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dprintk("NFS: Couldn't create server thread; err = %d\n", ret);
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goto err_net;
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}
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/*
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* Kill the callback thread if it's no longer being used.
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*/
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void nfs_callback_down(int minorversion, struct net *net)
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{
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struct nfs_callback_data *cb_info = &nfs_callback_info[minorversion];
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struct svc_serv *serv;
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mutex_lock(&nfs_callback_mutex);
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serv = cb_info->serv;
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nfs_callback_down_net(minorversion, serv, net);
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cb_info->users--;
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if (cb_info->users == 0) {
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svc_get(serv);
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serv->sv_ops->svo_setup(serv, NULL, 0);
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svc_destroy(serv);
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dprintk("nfs_callback_down: service destroyed\n");
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cb_info->serv = NULL;
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}
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mutex_unlock(&nfs_callback_mutex);
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}
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/* Boolean check of RPC_AUTH_GSS principal */
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int
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check_gss_callback_principal(struct nfs_client *clp, struct svc_rqst *rqstp)
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{
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char *p = rqstp->rq_cred.cr_principal;
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if (rqstp->rq_authop->flavour != RPC_AUTH_GSS)
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return 1;
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/* No RPC_AUTH_GSS on NFSv4.1 back channel yet */
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if (clp->cl_minorversion != 0)
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return 0;
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/*
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* It might just be a normal user principal, in which case
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* userspace won't bother to tell us the name at all.
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*/
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if (p == NULL)
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return 0;
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/*
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* Did we get the acceptor from userland during the SETCLIENID
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* negotiation?
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*/
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if (clp->cl_acceptor)
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return !strcmp(p, clp->cl_acceptor);
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/*
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* Otherwise try to verify it using the cl_hostname. Note that this
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* doesn't work if a non-canonical hostname was used in the devname.
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*/
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/* Expect a GSS_C_NT_HOSTBASED_NAME like "nfs@serverhostname" */
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if (memcmp(p, "nfs@", 4) != 0)
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return 0;
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p += 4;
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if (strcmp(p, clp->cl_hostname) != 0)
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return 0;
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return 1;
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}
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/*
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* pg_authenticate method for nfsv4 callback threads.
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*
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* The authflavor has been negotiated, so an incorrect flavor is a server
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* bug. Deny packets with incorrect authflavor.
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*
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* All other checking done after NFS decoding where the nfs_client can be
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* found in nfs4_callback_compound
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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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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_GSS:
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/* No RPC_AUTH_GSS support yet in NFSv4.1 */
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if (svc_is_backchannel(rqstp))
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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 const struct svc_version *nfs4_callback_version[] = {
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[1] = &nfs4_callback_version1,
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[4] = &nfs4_callback_version4,
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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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.pg_init_request = svc_generic_init_request,
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.pg_rpcbind_set = svc_generic_rpcbind_set,
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};
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