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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> |
14c85021 ACM |
18 | |
19 | #include <net/inet_sock.h> | |
20 | ||
4ce79717 | 21 | #include "nfs4_fs.h" |
1da177e4 | 22 | #include "callback.h" |
24c8dbbb | 23 | #include "internal.h" |
1da177e4 LT |
24 | |
25 | #define NFSDBG_FACILITY NFSDBG_CALLBACK | |
26 | ||
27 | struct nfs_callback_data { | |
28 | unsigned int users; | |
29 | struct svc_serv *serv; | |
30 | pid_t pid; | |
31 | struct completion started; | |
32 | struct completion stopped; | |
33 | }; | |
34 | ||
35 | static struct nfs_callback_data nfs_callback_info; | |
353ab6e9 | 36 | static DEFINE_MUTEX(nfs_callback_mutex); |
1da177e4 LT |
37 | static struct svc_program nfs4_callback_program; |
38 | ||
a72b4422 | 39 | unsigned int nfs_callback_set_tcpport; |
1da177e4 | 40 | unsigned short nfs_callback_tcpport; |
7d4e2747 DH |
41 | static const int nfs_set_port_min = 0; |
42 | static const int nfs_set_port_max = 65535; | |
43 | ||
44 | static int param_set_port(const char *val, struct kernel_param *kp) | |
45 | { | |
46 | char *endp; | |
47 | int num = simple_strtol(val, &endp, 0); | |
48 | if (endp == val || *endp || num < nfs_set_port_min || num > nfs_set_port_max) | |
49 | return -EINVAL; | |
50 | *((int *)kp->arg) = num; | |
51 | return 0; | |
52 | } | |
53 | ||
54 | module_param_call(callback_tcpport, param_set_port, param_get_int, | |
55 | &nfs_callback_set_tcpport, 0644); | |
1da177e4 LT |
56 | |
57 | /* | |
58 | * This is the callback kernel thread. | |
59 | */ | |
60 | static void nfs_callback_svc(struct svc_rqst *rqstp) | |
61 | { | |
1da177e4 LT |
62 | int err; |
63 | ||
64 | __module_get(THIS_MODULE); | |
65 | lock_kernel(); | |
66 | ||
67 | nfs_callback_info.pid = current->pid; | |
68 | daemonize("nfsv4-svc"); | |
69 | /* Process request with signals blocked, but allow SIGKILL. */ | |
70 | allow_signal(SIGKILL); | |
83144186 | 71 | set_freezable(); |
1da177e4 LT |
72 | |
73 | complete(&nfs_callback_info.started); | |
74 | ||
1dd761e9 TM |
75 | for(;;) { |
76 | if (signalled()) { | |
77 | if (nfs_callback_info.users == 0) | |
78 | break; | |
79 | flush_signals(current); | |
80 | } | |
1da177e4 LT |
81 | /* |
82 | * Listen for a request on the socket | |
83 | */ | |
6fb2b47f | 84 | err = svc_recv(rqstp, MAX_SCHEDULE_TIMEOUT); |
1da177e4 LT |
85 | if (err == -EAGAIN || err == -EINTR) |
86 | continue; | |
87 | if (err < 0) { | |
88 | printk(KERN_WARNING | |
89 | "%s: terminating on error %d\n", | |
90 | __FUNCTION__, -err); | |
91 | break; | |
92 | } | |
6fb2b47f | 93 | svc_process(rqstp); |
1da177e4 LT |
94 | } |
95 | ||
1227a74e | 96 | flush_signals(current); |
f25bc349 | 97 | svc_exit_thread(rqstp); |
1da177e4 LT |
98 | nfs_callback_info.pid = 0; |
99 | complete(&nfs_callback_info.stopped); | |
100 | unlock_kernel(); | |
101 | module_put_and_exit(0); | |
102 | } | |
103 | ||
104 | /* | |
105 | * Bring up the server process if it is not already up. | |
106 | */ | |
107 | int nfs_callback_up(void) | |
108 | { | |
8e60029f | 109 | struct svc_serv *serv = NULL; |
1da177e4 LT |
110 | int ret = 0; |
111 | ||
112 | lock_kernel(); | |
353ab6e9 | 113 | mutex_lock(&nfs_callback_mutex); |
1da177e4 LT |
114 | if (nfs_callback_info.users++ || nfs_callback_info.pid != 0) |
115 | goto out; | |
116 | init_completion(&nfs_callback_info.started); | |
117 | init_completion(&nfs_callback_info.stopped); | |
bc591ccf | 118 | serv = svc_create(&nfs4_callback_program, NFS4_CALLBACK_BUFSIZE, NULL); |
1da177e4 LT |
119 | ret = -ENOMEM; |
120 | if (!serv) | |
121 | goto out_err; | |
482fb94e | 122 | |
d7c9f1ed TT |
123 | ret = svc_create_xprt(serv, "tcp", nfs_callback_set_tcpport, |
124 | SVC_SOCK_ANONYMOUS); | |
482fb94e | 125 | if (ret <= 0) |
8e60029f | 126 | goto out_err; |
482fb94e CL |
127 | nfs_callback_tcpport = ret; |
128 | dprintk("Callback port = 0x%x\n", nfs_callback_tcpport); | |
129 | ||
1da177e4 LT |
130 | ret = svc_create_thread(nfs_callback_svc, serv); |
131 | if (ret < 0) | |
8e60029f | 132 | goto out_err; |
1da177e4 LT |
133 | nfs_callback_info.serv = serv; |
134 | wait_for_completion(&nfs_callback_info.started); | |
135 | out: | |
8e60029f JL |
136 | /* |
137 | * svc_create creates the svc_serv with sv_nrthreads == 1, and then | |
138 | * svc_create_thread increments that. So we need to call svc_destroy | |
139 | * on both success and failure so that the refcount is 1 when the | |
140 | * thread exits. | |
141 | */ | |
142 | if (serv) | |
143 | svc_destroy(serv); | |
353ab6e9 | 144 | mutex_unlock(&nfs_callback_mutex); |
1da177e4 LT |
145 | unlock_kernel(); |
146 | return ret; | |
8e60029f | 147 | out_err: |
482fb94e CL |
148 | dprintk("Couldn't create callback socket or server thread; err = %d\n", |
149 | ret); | |
1da177e4 LT |
150 | nfs_callback_info.users--; |
151 | goto out; | |
152 | } | |
153 | ||
154 | /* | |
155 | * Kill the server process if it is not already up. | |
156 | */ | |
5ae1fbce | 157 | void nfs_callback_down(void) |
1da177e4 | 158 | { |
1da177e4 | 159 | lock_kernel(); |
353ab6e9 | 160 | mutex_lock(&nfs_callback_mutex); |
1dd761e9 TM |
161 | nfs_callback_info.users--; |
162 | do { | |
163 | if (nfs_callback_info.users != 0 || nfs_callback_info.pid == 0) | |
164 | break; | |
165 | if (kill_proc(nfs_callback_info.pid, SIGKILL, 1) < 0) | |
166 | break; | |
167 | } while (wait_for_completion_timeout(&nfs_callback_info.stopped, 5*HZ) == 0); | |
353ab6e9 | 168 | mutex_unlock(&nfs_callback_mutex); |
1da177e4 | 169 | unlock_kernel(); |
1da177e4 LT |
170 | } |
171 | ||
172 | static int nfs_callback_authenticate(struct svc_rqst *rqstp) | |
173 | { | |
adfa6f98 | 174 | struct nfs_client *clp; |
5216a8e7 | 175 | RPC_IFDEBUG(char buf[RPC_MAX_ADDRBUFLEN]); |
1da177e4 LT |
176 | |
177 | /* Don't talk to strangers */ | |
ff052645 | 178 | clp = nfs_find_client(svc_addr(rqstp), 4); |
1da177e4 LT |
179 | if (clp == NULL) |
180 | return SVC_DROP; | |
ad06e4bd CL |
181 | |
182 | dprintk("%s: %s NFSv4 callback!\n", __FUNCTION__, | |
183 | svc_print_addr(rqstp, buf, sizeof(buf))); | |
24c8dbbb | 184 | nfs_put_client(clp); |
ad06e4bd | 185 | |
1da177e4 LT |
186 | switch (rqstp->rq_authop->flavour) { |
187 | case RPC_AUTH_NULL: | |
188 | if (rqstp->rq_proc != CB_NULL) | |
189 | return SVC_DENIED; | |
190 | break; | |
191 | case RPC_AUTH_UNIX: | |
192 | break; | |
193 | case RPC_AUTH_GSS: | |
194 | /* FIXME: RPCSEC_GSS handling? */ | |
195 | default: | |
196 | return SVC_DENIED; | |
197 | } | |
198 | return SVC_OK; | |
199 | } | |
200 | ||
201 | /* | |
202 | * Define NFS4 callback program | |
203 | */ | |
1da177e4 LT |
204 | static struct svc_version *nfs4_callback_version[] = { |
205 | [1] = &nfs4_callback_version1, | |
206 | }; | |
207 | ||
208 | static struct svc_stat nfs4_callback_stats; | |
209 | ||
210 | static struct svc_program nfs4_callback_program = { | |
211 | .pg_prog = NFS4_CALLBACK, /* RPC service number */ | |
212 | .pg_nvers = ARRAY_SIZE(nfs4_callback_version), /* Number of entries */ | |
213 | .pg_vers = nfs4_callback_version, /* version table */ | |
214 | .pg_name = "NFSv4 callback", /* service name */ | |
215 | .pg_class = "nfs", /* authentication class */ | |
216 | .pg_stats = &nfs4_callback_stats, | |
217 | .pg_authenticate = nfs_callback_authenticate, | |
218 | }; |