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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 | 75 | for(;;) { |
ad06e4bd CL |
76 | char buf[RPC_MAX_ADDRBUFLEN]; |
77 | ||
1dd761e9 TM |
78 | if (signalled()) { |
79 | if (nfs_callback_info.users == 0) | |
80 | break; | |
81 | flush_signals(current); | |
82 | } | |
1da177e4 LT |
83 | /* |
84 | * Listen for a request on the socket | |
85 | */ | |
6fb2b47f | 86 | err = svc_recv(rqstp, MAX_SCHEDULE_TIMEOUT); |
1da177e4 LT |
87 | if (err == -EAGAIN || err == -EINTR) |
88 | continue; | |
89 | if (err < 0) { | |
90 | printk(KERN_WARNING | |
91 | "%s: terminating on error %d\n", | |
92 | __FUNCTION__, -err); | |
93 | break; | |
94 | } | |
ad06e4bd CL |
95 | dprintk("%s: request from %s\n", __FUNCTION__, |
96 | svc_print_addr(rqstp, buf, sizeof(buf))); | |
6fb2b47f | 97 | svc_process(rqstp); |
1da177e4 LT |
98 | } |
99 | ||
f25bc349 | 100 | svc_exit_thread(rqstp); |
1da177e4 LT |
101 | nfs_callback_info.pid = 0; |
102 | complete(&nfs_callback_info.stopped); | |
103 | unlock_kernel(); | |
104 | module_put_and_exit(0); | |
105 | } | |
106 | ||
107 | /* | |
108 | * Bring up the server process if it is not already up. | |
109 | */ | |
110 | int nfs_callback_up(void) | |
111 | { | |
112 | struct svc_serv *serv; | |
1da177e4 LT |
113 | int ret = 0; |
114 | ||
115 | lock_kernel(); | |
353ab6e9 | 116 | mutex_lock(&nfs_callback_mutex); |
1da177e4 LT |
117 | if (nfs_callback_info.users++ || nfs_callback_info.pid != 0) |
118 | goto out; | |
119 | init_completion(&nfs_callback_info.started); | |
120 | init_completion(&nfs_callback_info.stopped); | |
bc591ccf | 121 | serv = svc_create(&nfs4_callback_program, NFS4_CALLBACK_BUFSIZE, NULL); |
1da177e4 LT |
122 | ret = -ENOMEM; |
123 | if (!serv) | |
124 | goto out_err; | |
482fb94e CL |
125 | |
126 | ret = svc_makesock(serv, IPPROTO_TCP, nfs_callback_set_tcpport, | |
127 | SVC_SOCK_ANONYMOUS); | |
128 | if (ret <= 0) | |
1da177e4 | 129 | goto out_destroy; |
482fb94e CL |
130 | nfs_callback_tcpport = ret; |
131 | dprintk("Callback port = 0x%x\n", nfs_callback_tcpport); | |
132 | ||
1da177e4 LT |
133 | ret = svc_create_thread(nfs_callback_svc, serv); |
134 | if (ret < 0) | |
135 | goto out_destroy; | |
136 | nfs_callback_info.serv = serv; | |
137 | wait_for_completion(&nfs_callback_info.started); | |
138 | out: | |
353ab6e9 | 139 | mutex_unlock(&nfs_callback_mutex); |
1da177e4 LT |
140 | unlock_kernel(); |
141 | return ret; | |
142 | out_destroy: | |
482fb94e CL |
143 | dprintk("Couldn't create callback socket or server thread; err = %d\n", |
144 | ret); | |
1da177e4 LT |
145 | svc_destroy(serv); |
146 | out_err: | |
147 | nfs_callback_info.users--; | |
148 | goto out; | |
149 | } | |
150 | ||
151 | /* | |
152 | * Kill the server process if it is not already up. | |
153 | */ | |
5ae1fbce | 154 | void nfs_callback_down(void) |
1da177e4 | 155 | { |
1da177e4 | 156 | lock_kernel(); |
353ab6e9 | 157 | mutex_lock(&nfs_callback_mutex); |
1dd761e9 TM |
158 | nfs_callback_info.users--; |
159 | do { | |
160 | if (nfs_callback_info.users != 0 || nfs_callback_info.pid == 0) | |
161 | break; | |
162 | if (kill_proc(nfs_callback_info.pid, SIGKILL, 1) < 0) | |
163 | break; | |
164 | } while (wait_for_completion_timeout(&nfs_callback_info.stopped, 5*HZ) == 0); | |
353ab6e9 | 165 | mutex_unlock(&nfs_callback_mutex); |
1da177e4 | 166 | unlock_kernel(); |
1da177e4 LT |
167 | } |
168 | ||
169 | static int nfs_callback_authenticate(struct svc_rqst *rqstp) | |
170 | { | |
27459f09 | 171 | struct sockaddr_in *addr = svc_addr_in(rqstp); |
adfa6f98 | 172 | struct nfs_client *clp; |
ad06e4bd | 173 | char buf[RPC_MAX_ADDRBUFLEN]; |
1da177e4 LT |
174 | |
175 | /* Don't talk to strangers */ | |
24c8dbbb | 176 | clp = nfs_find_client(addr, 4); |
1da177e4 LT |
177 | if (clp == NULL) |
178 | return SVC_DROP; | |
ad06e4bd CL |
179 | |
180 | dprintk("%s: %s NFSv4 callback!\n", __FUNCTION__, | |
181 | svc_print_addr(rqstp, buf, sizeof(buf))); | |
24c8dbbb | 182 | nfs_put_client(clp); |
ad06e4bd | 183 | |
1da177e4 LT |
184 | switch (rqstp->rq_authop->flavour) { |
185 | case RPC_AUTH_NULL: | |
186 | if (rqstp->rq_proc != CB_NULL) | |
187 | return SVC_DENIED; | |
188 | break; | |
189 | case RPC_AUTH_UNIX: | |
190 | break; | |
191 | case RPC_AUTH_GSS: | |
192 | /* FIXME: RPCSEC_GSS handling? */ | |
193 | default: | |
194 | return SVC_DENIED; | |
195 | } | |
196 | return SVC_OK; | |
197 | } | |
198 | ||
199 | /* | |
200 | * Define NFS4 callback program | |
201 | */ | |
1da177e4 LT |
202 | static struct svc_version *nfs4_callback_version[] = { |
203 | [1] = &nfs4_callback_version1, | |
204 | }; | |
205 | ||
206 | static struct svc_stat nfs4_callback_stats; | |
207 | ||
208 | static struct svc_program nfs4_callback_program = { | |
209 | .pg_prog = NFS4_CALLBACK, /* RPC service number */ | |
210 | .pg_nvers = ARRAY_SIZE(nfs4_callback_version), /* Number of entries */ | |
211 | .pg_vers = nfs4_callback_version, /* version table */ | |
212 | .pg_name = "NFSv4 callback", /* service name */ | |
213 | .pg_class = "nfs", /* authentication class */ | |
214 | .pg_stats = &nfs4_callback_stats, | |
215 | .pg_authenticate = nfs_callback_authenticate, | |
216 | }; |