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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> |
14c85021 ACM |
17 | |
18 | #include <net/inet_sock.h> | |
19 | ||
4ce79717 | 20 | #include "nfs4_fs.h" |
1da177e4 LT |
21 | #include "callback.h" |
22 | ||
23 | #define NFSDBG_FACILITY NFSDBG_CALLBACK | |
24 | ||
25 | struct nfs_callback_data { | |
26 | unsigned int users; | |
27 | struct svc_serv *serv; | |
28 | pid_t pid; | |
29 | struct completion started; | |
30 | struct completion stopped; | |
31 | }; | |
32 | ||
33 | static struct nfs_callback_data nfs_callback_info; | |
353ab6e9 | 34 | static DEFINE_MUTEX(nfs_callback_mutex); |
1da177e4 LT |
35 | static struct svc_program nfs4_callback_program; |
36 | ||
a72b4422 | 37 | unsigned int nfs_callback_set_tcpport; |
1da177e4 | 38 | unsigned short nfs_callback_tcpport; |
7d4e2747 DH |
39 | static const int nfs_set_port_min = 0; |
40 | static const int nfs_set_port_max = 65535; | |
41 | ||
42 | static int param_set_port(const char *val, struct kernel_param *kp) | |
43 | { | |
44 | char *endp; | |
45 | int num = simple_strtol(val, &endp, 0); | |
46 | if (endp == val || *endp || num < nfs_set_port_min || num > nfs_set_port_max) | |
47 | return -EINVAL; | |
48 | *((int *)kp->arg) = num; | |
49 | return 0; | |
50 | } | |
51 | ||
52 | module_param_call(callback_tcpport, param_set_port, param_get_int, | |
53 | &nfs_callback_set_tcpport, 0644); | |
1da177e4 LT |
54 | |
55 | /* | |
56 | * This is the callback kernel thread. | |
57 | */ | |
58 | static void nfs_callback_svc(struct svc_rqst *rqstp) | |
59 | { | |
60 | struct svc_serv *serv = rqstp->rq_server; | |
61 | int err; | |
62 | ||
63 | __module_get(THIS_MODULE); | |
64 | lock_kernel(); | |
65 | ||
66 | nfs_callback_info.pid = current->pid; | |
67 | daemonize("nfsv4-svc"); | |
68 | /* Process request with signals blocked, but allow SIGKILL. */ | |
69 | allow_signal(SIGKILL); | |
70 | ||
71 | complete(&nfs_callback_info.started); | |
72 | ||
1dd761e9 TM |
73 | for(;;) { |
74 | if (signalled()) { | |
75 | if (nfs_callback_info.users == 0) | |
76 | break; | |
77 | flush_signals(current); | |
78 | } | |
1da177e4 LT |
79 | /* |
80 | * Listen for a request on the socket | |
81 | */ | |
82 | err = svc_recv(serv, rqstp, MAX_SCHEDULE_TIMEOUT); | |
83 | if (err == -EAGAIN || err == -EINTR) | |
84 | continue; | |
85 | if (err < 0) { | |
86 | printk(KERN_WARNING | |
87 | "%s: terminating on error %d\n", | |
88 | __FUNCTION__, -err); | |
89 | break; | |
90 | } | |
91 | dprintk("%s: request from %u.%u.%u.%u\n", __FUNCTION__, | |
92 | NIPQUAD(rqstp->rq_addr.sin_addr.s_addr)); | |
93 | svc_process(serv, rqstp); | |
94 | } | |
95 | ||
f25bc349 | 96 | svc_exit_thread(rqstp); |
1da177e4 LT |
97 | nfs_callback_info.pid = 0; |
98 | complete(&nfs_callback_info.stopped); | |
99 | unlock_kernel(); | |
100 | module_put_and_exit(0); | |
101 | } | |
102 | ||
103 | /* | |
104 | * Bring up the server process if it is not already up. | |
105 | */ | |
106 | int nfs_callback_up(void) | |
107 | { | |
108 | struct svc_serv *serv; | |
109 | struct svc_sock *svsk; | |
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); | |
118 | serv = svc_create(&nfs4_callback_program, NFS4_CALLBACK_BUFSIZE); | |
119 | ret = -ENOMEM; | |
120 | if (!serv) | |
121 | goto out_err; | |
122 | /* FIXME: We don't want to register this socket with the portmapper */ | |
a72b4422 | 123 | ret = svc_makesock(serv, IPPROTO_TCP, nfs_callback_set_tcpport); |
1da177e4 LT |
124 | if (ret < 0) |
125 | goto out_destroy; | |
126 | if (!list_empty(&serv->sv_permsocks)) { | |
127 | svsk = list_entry(serv->sv_permsocks.next, | |
128 | struct svc_sock, sk_list); | |
129 | nfs_callback_tcpport = ntohs(inet_sk(svsk->sk_sk)->sport); | |
130 | dprintk ("Callback port = 0x%x\n", nfs_callback_tcpport); | |
131 | } else | |
132 | BUG(); | |
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: | |
143 | svc_destroy(serv); | |
144 | out_err: | |
145 | nfs_callback_info.users--; | |
146 | goto out; | |
147 | } | |
148 | ||
149 | /* | |
150 | * Kill the server process if it is not already up. | |
151 | */ | |
5ae1fbce | 152 | void nfs_callback_down(void) |
1da177e4 | 153 | { |
1da177e4 | 154 | lock_kernel(); |
353ab6e9 | 155 | mutex_lock(&nfs_callback_mutex); |
1dd761e9 TM |
156 | nfs_callback_info.users--; |
157 | do { | |
158 | if (nfs_callback_info.users != 0 || nfs_callback_info.pid == 0) | |
159 | break; | |
160 | if (kill_proc(nfs_callback_info.pid, SIGKILL, 1) < 0) | |
161 | break; | |
162 | } while (wait_for_completion_timeout(&nfs_callback_info.stopped, 5*HZ) == 0); | |
353ab6e9 | 163 | mutex_unlock(&nfs_callback_mutex); |
1da177e4 | 164 | unlock_kernel(); |
1da177e4 LT |
165 | } |
166 | ||
167 | static int nfs_callback_authenticate(struct svc_rqst *rqstp) | |
168 | { | |
169 | struct in_addr *addr = &rqstp->rq_addr.sin_addr; | |
adfa6f98 | 170 | struct nfs_client *clp; |
1da177e4 LT |
171 | |
172 | /* Don't talk to strangers */ | |
173 | clp = nfs4_find_client(addr); | |
174 | if (clp == NULL) | |
175 | return SVC_DROP; | |
176 | dprintk("%s: %u.%u.%u.%u NFSv4 callback!\n", __FUNCTION__, NIPQUAD(addr)); | |
177 | nfs4_put_client(clp); | |
178 | switch (rqstp->rq_authop->flavour) { | |
179 | case RPC_AUTH_NULL: | |
180 | if (rqstp->rq_proc != CB_NULL) | |
181 | return SVC_DENIED; | |
182 | break; | |
183 | case RPC_AUTH_UNIX: | |
184 | break; | |
185 | case RPC_AUTH_GSS: | |
186 | /* FIXME: RPCSEC_GSS handling? */ | |
187 | default: | |
188 | return SVC_DENIED; | |
189 | } | |
190 | return SVC_OK; | |
191 | } | |
192 | ||
193 | /* | |
194 | * Define NFS4 callback program | |
195 | */ | |
1da177e4 LT |
196 | static struct svc_version *nfs4_callback_version[] = { |
197 | [1] = &nfs4_callback_version1, | |
198 | }; | |
199 | ||
200 | static struct svc_stat nfs4_callback_stats; | |
201 | ||
202 | static struct svc_program nfs4_callback_program = { | |
203 | .pg_prog = NFS4_CALLBACK, /* RPC service number */ | |
204 | .pg_nvers = ARRAY_SIZE(nfs4_callback_version), /* Number of entries */ | |
205 | .pg_vers = nfs4_callback_version, /* version table */ | |
206 | .pg_name = "NFSv4 callback", /* service name */ | |
207 | .pg_class = "nfs", /* authentication class */ | |
208 | .pg_stats = &nfs4_callback_stats, | |
209 | .pg_authenticate = nfs_callback_authenticate, | |
210 | }; |