2 * linux/fs/nfs/callback.c
4 * Copyright (C) 2004 Trond Myklebust
6 * NFSv4 callback handling
9 #include <linux/completion.h>
11 #include <linux/module.h>
12 #include <linux/smp_lock.h>
13 #include <linux/sunrpc/svc.h>
14 #include <linux/sunrpc/svcsock.h>
15 #include <linux/nfs_fs.h>
16 #include <linux/mutex.h>
18 #include <net/inet_sock.h>
24 #define NFSDBG_FACILITY NFSDBG_CALLBACK
26 struct nfs_callback_data
{
28 struct svc_serv
*serv
;
30 struct completion started
;
31 struct completion stopped
;
34 static struct nfs_callback_data nfs_callback_info
;
35 static DEFINE_MUTEX(nfs_callback_mutex
);
36 static struct svc_program nfs4_callback_program
;
38 unsigned int nfs_callback_set_tcpport
;
39 unsigned short nfs_callback_tcpport
;
40 static const int nfs_set_port_min
= 0;
41 static const int nfs_set_port_max
= 65535;
43 static int param_set_port(const char *val
, struct kernel_param
*kp
)
46 int num
= simple_strtol(val
, &endp
, 0);
47 if (endp
== val
|| *endp
|| num
< nfs_set_port_min
|| num
> nfs_set_port_max
)
49 *((int *)kp
->arg
) = num
;
53 module_param_call(callback_tcpport
, param_set_port
, param_get_int
,
54 &nfs_callback_set_tcpport
, 0644);
57 * This is the callback kernel thread.
59 static void nfs_callback_svc(struct svc_rqst
*rqstp
)
61 struct svc_serv
*serv
= rqstp
->rq_server
;
64 __module_get(THIS_MODULE
);
67 nfs_callback_info
.pid
= current
->pid
;
68 daemonize("nfsv4-svc");
69 /* Process request with signals blocked, but allow SIGKILL. */
70 allow_signal(SIGKILL
);
72 complete(&nfs_callback_info
.started
);
76 if (nfs_callback_info
.users
== 0)
78 flush_signals(current
);
81 * Listen for a request on the socket
83 err
= svc_recv(serv
, rqstp
, MAX_SCHEDULE_TIMEOUT
);
84 if (err
== -EAGAIN
|| err
== -EINTR
)
88 "%s: terminating on error %d\n",
92 dprintk("%s: request from %u.%u.%u.%u\n", __FUNCTION__
,
93 NIPQUAD(rqstp
->rq_addr
.sin_addr
.s_addr
));
94 svc_process(serv
, rqstp
);
97 svc_exit_thread(rqstp
);
98 nfs_callback_info
.pid
= 0;
99 complete(&nfs_callback_info
.stopped
);
101 module_put_and_exit(0);
105 * Bring up the server process if it is not already up.
107 int nfs_callback_up(void)
109 struct svc_serv
*serv
;
110 struct svc_sock
*svsk
;
114 mutex_lock(&nfs_callback_mutex
);
115 if (nfs_callback_info
.users
++ || nfs_callback_info
.pid
!= 0)
117 init_completion(&nfs_callback_info
.started
);
118 init_completion(&nfs_callback_info
.stopped
);
119 serv
= svc_create(&nfs4_callback_program
, NFS4_CALLBACK_BUFSIZE
);
123 /* FIXME: We don't want to register this socket with the portmapper */
124 ret
= svc_makesock(serv
, IPPROTO_TCP
, nfs_callback_set_tcpport
);
127 if (!list_empty(&serv
->sv_permsocks
)) {
128 svsk
= list_entry(serv
->sv_permsocks
.next
,
129 struct svc_sock
, sk_list
);
130 nfs_callback_tcpport
= ntohs(inet_sk(svsk
->sk_sk
)->sport
);
131 dprintk ("Callback port = 0x%x\n", nfs_callback_tcpport
);
134 ret
= svc_create_thread(nfs_callback_svc
, serv
);
137 nfs_callback_info
.serv
= serv
;
138 wait_for_completion(&nfs_callback_info
.started
);
140 mutex_unlock(&nfs_callback_mutex
);
146 nfs_callback_info
.users
--;
151 * Kill the server process if it is not already up.
153 void nfs_callback_down(void)
156 mutex_lock(&nfs_callback_mutex
);
157 nfs_callback_info
.users
--;
159 if (nfs_callback_info
.users
!= 0 || nfs_callback_info
.pid
== 0)
161 if (kill_proc(nfs_callback_info
.pid
, SIGKILL
, 1) < 0)
163 } while (wait_for_completion_timeout(&nfs_callback_info
.stopped
, 5*HZ
) == 0);
164 mutex_unlock(&nfs_callback_mutex
);
168 static int nfs_callback_authenticate(struct svc_rqst
*rqstp
)
170 struct sockaddr_in
*addr
= &rqstp
->rq_addr
;
171 struct nfs_client
*clp
;
173 /* Don't talk to strangers */
174 clp
= nfs_find_client(addr
, 4);
177 dprintk("%s: %u.%u.%u.%u NFSv4 callback!\n", __FUNCTION__
, NIPQUAD(addr
->sin_addr
));
179 switch (rqstp
->rq_authop
->flavour
) {
181 if (rqstp
->rq_proc
!= CB_NULL
)
187 /* FIXME: RPCSEC_GSS handling? */
195 * Define NFS4 callback program
197 static struct svc_version
*nfs4_callback_version
[] = {
198 [1] = &nfs4_callback_version1
,
201 static struct svc_stat nfs4_callback_stats
;
203 static struct svc_program nfs4_callback_program
= {
204 .pg_prog
= NFS4_CALLBACK
, /* RPC service number */
205 .pg_nvers
= ARRAY_SIZE(nfs4_callback_version
), /* Number of entries */
206 .pg_vers
= nfs4_callback_version
, /* version table */
207 .pg_name
= "NFSv4 callback", /* service name */
208 .pg_class
= "nfs", /* authentication class */
209 .pg_stats
= &nfs4_callback_stats
,
210 .pg_authenticate
= nfs_callback_authenticate
,