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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 | ||
9 | #include <linux/config.h> | |
10 | #include <linux/completion.h> | |
11 | #include <linux/ip.h> | |
12 | #include <linux/module.h> | |
13 | #include <linux/smp_lock.h> | |
14 | #include <linux/sunrpc/svc.h> | |
15 | #include <linux/sunrpc/svcsock.h> | |
16 | #include <linux/nfs_fs.h> | |
4ce79717 | 17 | #include "nfs4_fs.h" |
1da177e4 LT |
18 | #include "callback.h" |
19 | ||
20 | #define NFSDBG_FACILITY NFSDBG_CALLBACK | |
21 | ||
22 | struct nfs_callback_data { | |
23 | unsigned int users; | |
24 | struct svc_serv *serv; | |
25 | pid_t pid; | |
26 | struct completion started; | |
27 | struct completion stopped; | |
28 | }; | |
29 | ||
30 | static struct nfs_callback_data nfs_callback_info; | |
31 | static DECLARE_MUTEX(nfs_callback_sema); | |
32 | static struct svc_program nfs4_callback_program; | |
33 | ||
34 | unsigned short nfs_callback_tcpport; | |
35 | ||
36 | /* | |
37 | * This is the callback kernel thread. | |
38 | */ | |
39 | static void nfs_callback_svc(struct svc_rqst *rqstp) | |
40 | { | |
41 | struct svc_serv *serv = rqstp->rq_server; | |
42 | int err; | |
43 | ||
44 | __module_get(THIS_MODULE); | |
45 | lock_kernel(); | |
46 | ||
47 | nfs_callback_info.pid = current->pid; | |
48 | daemonize("nfsv4-svc"); | |
49 | /* Process request with signals blocked, but allow SIGKILL. */ | |
50 | allow_signal(SIGKILL); | |
51 | ||
52 | complete(&nfs_callback_info.started); | |
53 | ||
54 | while (nfs_callback_info.users != 0 || !signalled()) { | |
55 | /* | |
56 | * Listen for a request on the socket | |
57 | */ | |
58 | err = svc_recv(serv, rqstp, MAX_SCHEDULE_TIMEOUT); | |
59 | if (err == -EAGAIN || err == -EINTR) | |
60 | continue; | |
61 | if (err < 0) { | |
62 | printk(KERN_WARNING | |
63 | "%s: terminating on error %d\n", | |
64 | __FUNCTION__, -err); | |
65 | break; | |
66 | } | |
67 | dprintk("%s: request from %u.%u.%u.%u\n", __FUNCTION__, | |
68 | NIPQUAD(rqstp->rq_addr.sin_addr.s_addr)); | |
69 | svc_process(serv, rqstp); | |
70 | } | |
71 | ||
72 | nfs_callback_info.pid = 0; | |
73 | complete(&nfs_callback_info.stopped); | |
74 | unlock_kernel(); | |
75 | module_put_and_exit(0); | |
76 | } | |
77 | ||
78 | /* | |
79 | * Bring up the server process if it is not already up. | |
80 | */ | |
81 | int nfs_callback_up(void) | |
82 | { | |
83 | struct svc_serv *serv; | |
84 | struct svc_sock *svsk; | |
85 | int ret = 0; | |
86 | ||
87 | lock_kernel(); | |
88 | down(&nfs_callback_sema); | |
89 | if (nfs_callback_info.users++ || nfs_callback_info.pid != 0) | |
90 | goto out; | |
91 | init_completion(&nfs_callback_info.started); | |
92 | init_completion(&nfs_callback_info.stopped); | |
93 | serv = svc_create(&nfs4_callback_program, NFS4_CALLBACK_BUFSIZE); | |
94 | ret = -ENOMEM; | |
95 | if (!serv) | |
96 | goto out_err; | |
97 | /* FIXME: We don't want to register this socket with the portmapper */ | |
98 | ret = svc_makesock(serv, IPPROTO_TCP, 0); | |
99 | if (ret < 0) | |
100 | goto out_destroy; | |
101 | if (!list_empty(&serv->sv_permsocks)) { | |
102 | svsk = list_entry(serv->sv_permsocks.next, | |
103 | struct svc_sock, sk_list); | |
104 | nfs_callback_tcpport = ntohs(inet_sk(svsk->sk_sk)->sport); | |
105 | dprintk ("Callback port = 0x%x\n", nfs_callback_tcpport); | |
106 | } else | |
107 | BUG(); | |
108 | ret = svc_create_thread(nfs_callback_svc, serv); | |
109 | if (ret < 0) | |
110 | goto out_destroy; | |
111 | nfs_callback_info.serv = serv; | |
112 | wait_for_completion(&nfs_callback_info.started); | |
113 | out: | |
114 | up(&nfs_callback_sema); | |
115 | unlock_kernel(); | |
116 | return ret; | |
117 | out_destroy: | |
118 | svc_destroy(serv); | |
119 | out_err: | |
120 | nfs_callback_info.users--; | |
121 | goto out; | |
122 | } | |
123 | ||
124 | /* | |
125 | * Kill the server process if it is not already up. | |
126 | */ | |
127 | int nfs_callback_down(void) | |
128 | { | |
129 | int ret = 0; | |
130 | ||
131 | lock_kernel(); | |
132 | down(&nfs_callback_sema); | |
133 | if (--nfs_callback_info.users || nfs_callback_info.pid == 0) | |
134 | goto out; | |
135 | kill_proc(nfs_callback_info.pid, SIGKILL, 1); | |
136 | wait_for_completion(&nfs_callback_info.stopped); | |
137 | out: | |
138 | up(&nfs_callback_sema); | |
139 | unlock_kernel(); | |
140 | return ret; | |
141 | } | |
142 | ||
143 | static int nfs_callback_authenticate(struct svc_rqst *rqstp) | |
144 | { | |
145 | struct in_addr *addr = &rqstp->rq_addr.sin_addr; | |
146 | struct nfs4_client *clp; | |
147 | ||
148 | /* Don't talk to strangers */ | |
149 | clp = nfs4_find_client(addr); | |
150 | if (clp == NULL) | |
151 | return SVC_DROP; | |
152 | dprintk("%s: %u.%u.%u.%u NFSv4 callback!\n", __FUNCTION__, NIPQUAD(addr)); | |
153 | nfs4_put_client(clp); | |
154 | switch (rqstp->rq_authop->flavour) { | |
155 | case RPC_AUTH_NULL: | |
156 | if (rqstp->rq_proc != CB_NULL) | |
157 | return SVC_DENIED; | |
158 | break; | |
159 | case RPC_AUTH_UNIX: | |
160 | break; | |
161 | case RPC_AUTH_GSS: | |
162 | /* FIXME: RPCSEC_GSS handling? */ | |
163 | default: | |
164 | return SVC_DENIED; | |
165 | } | |
166 | return SVC_OK; | |
167 | } | |
168 | ||
169 | /* | |
170 | * Define NFS4 callback program | |
171 | */ | |
172 | extern struct svc_version nfs4_callback_version1; | |
173 | ||
174 | static struct svc_version *nfs4_callback_version[] = { | |
175 | [1] = &nfs4_callback_version1, | |
176 | }; | |
177 | ||
178 | static struct svc_stat nfs4_callback_stats; | |
179 | ||
180 | static struct svc_program nfs4_callback_program = { | |
181 | .pg_prog = NFS4_CALLBACK, /* RPC service number */ | |
182 | .pg_nvers = ARRAY_SIZE(nfs4_callback_version), /* Number of entries */ | |
183 | .pg_vers = nfs4_callback_version, /* version table */ | |
184 | .pg_name = "NFSv4 callback", /* service name */ | |
185 | .pg_class = "nfs", /* authentication class */ | |
186 | .pg_stats = &nfs4_callback_stats, | |
187 | .pg_authenticate = nfs_callback_authenticate, | |
188 | }; |