Commit | Line | Data |
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1da177e4 LT |
1 | /* |
2 | * linux/fs/nfs/callback.c | |
3 | * | |
4 | * Copyright (C) 2004 Trond Myklebust | |
5 | * | |
6 | * NFSv4 callback handling | |
7 | */ | |
8 | ||
1da177e4 LT |
9 | #include <linux/completion.h> |
10 | #include <linux/ip.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> | |
353ab6e9 | 16 | #include <linux/mutex.h> |
83144186 | 17 | #include <linux/freezer.h> |
a277e33c | 18 | #include <linux/kthread.h> |
14c85021 ACM |
19 | |
20 | #include <net/inet_sock.h> | |
21 | ||
4ce79717 | 22 | #include "nfs4_fs.h" |
1da177e4 | 23 | #include "callback.h" |
24c8dbbb | 24 | #include "internal.h" |
1da177e4 LT |
25 | |
26 | #define NFSDBG_FACILITY NFSDBG_CALLBACK | |
27 | ||
28 | struct nfs_callback_data { | |
29 | unsigned int users; | |
30 | struct svc_serv *serv; | |
a277e33c | 31 | struct task_struct *task; |
1da177e4 LT |
32 | }; |
33 | ||
34 | static struct nfs_callback_data nfs_callback_info; | |
353ab6e9 | 35 | static DEFINE_MUTEX(nfs_callback_mutex); |
1da177e4 LT |
36 | static struct svc_program nfs4_callback_program; |
37 | ||
a72b4422 | 38 | unsigned int nfs_callback_set_tcpport; |
1da177e4 | 39 | unsigned short nfs_callback_tcpport; |
7d4e2747 DH |
40 | static const int nfs_set_port_min = 0; |
41 | static const int nfs_set_port_max = 65535; | |
42 | ||
43 | static int param_set_port(const char *val, struct kernel_param *kp) | |
44 | { | |
45 | char *endp; | |
46 | int num = simple_strtol(val, &endp, 0); | |
47 | if (endp == val || *endp || num < nfs_set_port_min || num > nfs_set_port_max) | |
48 | return -EINVAL; | |
49 | *((int *)kp->arg) = num; | |
50 | return 0; | |
51 | } | |
52 | ||
53 | module_param_call(callback_tcpport, param_set_port, param_get_int, | |
54 | &nfs_callback_set_tcpport, 0644); | |
1da177e4 LT |
55 | |
56 | /* | |
57 | * This is the callback kernel thread. | |
58 | */ | |
a277e33c JL |
59 | static int |
60 | nfs_callback_svc(void *vrqstp) | |
1da177e4 | 61 | { |
06e02d66 | 62 | int err, preverr = 0; |
a277e33c | 63 | struct svc_rqst *rqstp = vrqstp; |
1da177e4 | 64 | |
83144186 | 65 | set_freezable(); |
1da177e4 | 66 | |
a277e33c JL |
67 | /* |
68 | * FIXME: do we really need to run this under the BKL? If so, please | |
69 | * add a comment about what it's intended to protect. | |
70 | */ | |
71 | lock_kernel(); | |
72 | while (!kthread_should_stop()) { | |
1da177e4 LT |
73 | /* |
74 | * Listen for a request on the socket | |
75 | */ | |
6fb2b47f | 76 | err = svc_recv(rqstp, MAX_SCHEDULE_TIMEOUT); |
06e02d66 JL |
77 | if (err == -EAGAIN || err == -EINTR) { |
78 | preverr = err; | |
1da177e4 | 79 | continue; |
06e02d66 | 80 | } |
1da177e4 | 81 | if (err < 0) { |
06e02d66 JL |
82 | if (err != preverr) { |
83 | printk(KERN_WARNING "%s: unexpected error " | |
84 | "from svc_recv (%d)\n", __func__, err); | |
85 | preverr = err; | |
86 | } | |
87 | schedule_timeout_uninterruptible(HZ); | |
88 | continue; | |
1da177e4 | 89 | } |
06e02d66 | 90 | preverr = err; |
6fb2b47f | 91 | svc_process(rqstp); |
1da177e4 | 92 | } |
1da177e4 | 93 | unlock_kernel(); |
a277e33c JL |
94 | nfs_callback_info.task = NULL; |
95 | svc_exit_thread(rqstp); | |
96 | return 0; | |
1da177e4 LT |
97 | } |
98 | ||
99 | /* | |
100 | * Bring up the server process if it is not already up. | |
101 | */ | |
102 | int nfs_callback_up(void) | |
103 | { | |
8e60029f | 104 | struct svc_serv *serv = NULL; |
a277e33c | 105 | struct svc_rqst *rqstp; |
1da177e4 LT |
106 | int ret = 0; |
107 | ||
108 | lock_kernel(); | |
353ab6e9 | 109 | mutex_lock(&nfs_callback_mutex); |
a277e33c | 110 | if (nfs_callback_info.users++ || nfs_callback_info.task != NULL) |
1da177e4 | 111 | goto out; |
bc591ccf | 112 | serv = svc_create(&nfs4_callback_program, NFS4_CALLBACK_BUFSIZE, NULL); |
1da177e4 LT |
113 | ret = -ENOMEM; |
114 | if (!serv) | |
115 | goto out_err; | |
482fb94e | 116 | |
d7c9f1ed TT |
117 | ret = svc_create_xprt(serv, "tcp", nfs_callback_set_tcpport, |
118 | SVC_SOCK_ANONYMOUS); | |
482fb94e | 119 | if (ret <= 0) |
8e60029f | 120 | goto out_err; |
482fb94e CL |
121 | nfs_callback_tcpport = ret; |
122 | dprintk("Callback port = 0x%x\n", nfs_callback_tcpport); | |
123 | ||
a277e33c JL |
124 | rqstp = svc_prepare_thread(serv, &serv->sv_pools[0]); |
125 | if (IS_ERR(rqstp)) { | |
126 | ret = PTR_ERR(rqstp); | |
8e60029f | 127 | goto out_err; |
a277e33c JL |
128 | } |
129 | ||
130 | svc_sock_update_bufs(serv); | |
1da177e4 | 131 | nfs_callback_info.serv = serv; |
a277e33c JL |
132 | |
133 | nfs_callback_info.task = kthread_run(nfs_callback_svc, rqstp, | |
134 | "nfsv4-svc"); | |
135 | if (IS_ERR(nfs_callback_info.task)) { | |
136 | ret = PTR_ERR(nfs_callback_info.task); | |
137 | nfs_callback_info.serv = NULL; | |
138 | nfs_callback_info.task = NULL; | |
139 | svc_exit_thread(rqstp); | |
140 | goto out_err; | |
141 | } | |
1da177e4 | 142 | out: |
8e60029f JL |
143 | /* |
144 | * svc_create creates the svc_serv with sv_nrthreads == 1, and then | |
a277e33c | 145 | * svc_prepare_thread increments that. So we need to call svc_destroy |
8e60029f JL |
146 | * on both success and failure so that the refcount is 1 when the |
147 | * thread exits. | |
148 | */ | |
149 | if (serv) | |
150 | svc_destroy(serv); | |
353ab6e9 | 151 | mutex_unlock(&nfs_callback_mutex); |
1da177e4 LT |
152 | unlock_kernel(); |
153 | return ret; | |
8e60029f | 154 | out_err: |
482fb94e CL |
155 | dprintk("Couldn't create callback socket or server thread; err = %d\n", |
156 | ret); | |
1da177e4 LT |
157 | nfs_callback_info.users--; |
158 | goto out; | |
159 | } | |
160 | ||
161 | /* | |
e1ba1ab7 | 162 | * Kill the server process if it is not already down. |
1da177e4 | 163 | */ |
5ae1fbce | 164 | void nfs_callback_down(void) |
1da177e4 | 165 | { |
1da177e4 | 166 | lock_kernel(); |
353ab6e9 | 167 | mutex_lock(&nfs_callback_mutex); |
1dd761e9 | 168 | nfs_callback_info.users--; |
a277e33c JL |
169 | if (nfs_callback_info.users == 0 && nfs_callback_info.task != NULL) |
170 | kthread_stop(nfs_callback_info.task); | |
353ab6e9 | 171 | mutex_unlock(&nfs_callback_mutex); |
1da177e4 | 172 | unlock_kernel(); |
1da177e4 LT |
173 | } |
174 | ||
175 | static int nfs_callback_authenticate(struct svc_rqst *rqstp) | |
176 | { | |
adfa6f98 | 177 | struct nfs_client *clp; |
5216a8e7 | 178 | RPC_IFDEBUG(char buf[RPC_MAX_ADDRBUFLEN]); |
1da177e4 LT |
179 | |
180 | /* Don't talk to strangers */ | |
ff052645 | 181 | clp = nfs_find_client(svc_addr(rqstp), 4); |
1da177e4 LT |
182 | if (clp == NULL) |
183 | return SVC_DROP; | |
ad06e4bd | 184 | |
3110ff80 | 185 | dprintk("%s: %s NFSv4 callback!\n", __func__, |
ad06e4bd | 186 | svc_print_addr(rqstp, buf, sizeof(buf))); |
24c8dbbb | 187 | nfs_put_client(clp); |
ad06e4bd | 188 | |
1da177e4 LT |
189 | switch (rqstp->rq_authop->flavour) { |
190 | case RPC_AUTH_NULL: | |
191 | if (rqstp->rq_proc != CB_NULL) | |
192 | return SVC_DENIED; | |
193 | break; | |
194 | case RPC_AUTH_UNIX: | |
195 | break; | |
196 | case RPC_AUTH_GSS: | |
197 | /* FIXME: RPCSEC_GSS handling? */ | |
198 | default: | |
199 | return SVC_DENIED; | |
200 | } | |
201 | return SVC_OK; | |
202 | } | |
203 | ||
204 | /* | |
205 | * Define NFS4 callback program | |
206 | */ | |
1da177e4 LT |
207 | static struct svc_version *nfs4_callback_version[] = { |
208 | [1] = &nfs4_callback_version1, | |
209 | }; | |
210 | ||
211 | static struct svc_stat nfs4_callback_stats; | |
212 | ||
213 | static struct svc_program nfs4_callback_program = { | |
214 | .pg_prog = NFS4_CALLBACK, /* RPC service number */ | |
215 | .pg_nvers = ARRAY_SIZE(nfs4_callback_version), /* Number of entries */ | |
216 | .pg_vers = nfs4_callback_version, /* version table */ | |
217 | .pg_name = "NFSv4 callback", /* service name */ | |
218 | .pg_class = "nfs", /* authentication class */ | |
219 | .pg_stats = &nfs4_callback_stats, | |
220 | .pg_authenticate = nfs_callback_authenticate, | |
221 | }; |