xref: /openbmc/linux/fs/nfsd/nfsctl.c (revision d5cb9783536a41df9f9cba5b0a1d78047ed787f7)
1 /*
2  * linux/fs/nfsd/nfsctl.c
3  *
4  * Syscall interface to knfsd.
5  *
6  * Copyright (C) 1995, 1996 Olaf Kirch <okir@monad.swb.de>
7  */
8 
9 #include <linux/config.h>
10 #include <linux/module.h>
11 
12 #include <linux/linkage.h>
13 #include <linux/time.h>
14 #include <linux/errno.h>
15 #include <linux/fs.h>
16 #include <linux/fcntl.h>
17 #include <linux/net.h>
18 #include <linux/in.h>
19 #include <linux/syscalls.h>
20 #include <linux/unistd.h>
21 #include <linux/slab.h>
22 #include <linux/proc_fs.h>
23 #include <linux/seq_file.h>
24 #include <linux/pagemap.h>
25 #include <linux/init.h>
26 
27 #include <linux/nfs.h>
28 #include <linux/nfsd_idmap.h>
29 #include <linux/sunrpc/svc.h>
30 #include <linux/nfsd/nfsd.h>
31 #include <linux/nfsd/cache.h>
32 #include <linux/nfsd/xdr.h>
33 #include <linux/nfsd/syscall.h>
34 #include <linux/nfsd/interface.h>
35 
36 #include <asm/uaccess.h>
37 
38 /*
39  *	We have a single directory with 9 nodes in it.
40  */
41 enum {
42 	NFSD_Root = 1,
43 	NFSD_Svc,
44 	NFSD_Add,
45 	NFSD_Del,
46 	NFSD_Export,
47 	NFSD_Unexport,
48 	NFSD_Getfd,
49 	NFSD_Getfs,
50 	NFSD_List,
51 	NFSD_Fh,
52 	NFSD_Threads,
53 	NFSD_Leasetime,
54 	NFSD_RecoveryDir,
55 };
56 
57 /*
58  * write() for these nodes.
59  */
60 static ssize_t write_svc(struct file *file, char *buf, size_t size);
61 static ssize_t write_add(struct file *file, char *buf, size_t size);
62 static ssize_t write_del(struct file *file, char *buf, size_t size);
63 static ssize_t write_export(struct file *file, char *buf, size_t size);
64 static ssize_t write_unexport(struct file *file, char *buf, size_t size);
65 static ssize_t write_getfd(struct file *file, char *buf, size_t size);
66 static ssize_t write_getfs(struct file *file, char *buf, size_t size);
67 static ssize_t write_filehandle(struct file *file, char *buf, size_t size);
68 static ssize_t write_threads(struct file *file, char *buf, size_t size);
69 static ssize_t write_leasetime(struct file *file, char *buf, size_t size);
70 static ssize_t write_recoverydir(struct file *file, char *buf, size_t size);
71 
72 static ssize_t (*write_op[])(struct file *, char *, size_t) = {
73 	[NFSD_Svc] = write_svc,
74 	[NFSD_Add] = write_add,
75 	[NFSD_Del] = write_del,
76 	[NFSD_Export] = write_export,
77 	[NFSD_Unexport] = write_unexport,
78 	[NFSD_Getfd] = write_getfd,
79 	[NFSD_Getfs] = write_getfs,
80 	[NFSD_Fh] = write_filehandle,
81 	[NFSD_Threads] = write_threads,
82 	[NFSD_Leasetime] = write_leasetime,
83 	[NFSD_RecoveryDir] = write_recoverydir,
84 };
85 
86 static ssize_t nfsctl_transaction_write(struct file *file, const char __user *buf, size_t size, loff_t *pos)
87 {
88 	ino_t ino =  file->f_dentry->d_inode->i_ino;
89 	char *data;
90 	ssize_t rv;
91 
92 	if (ino >= sizeof(write_op)/sizeof(write_op[0]) || !write_op[ino])
93 		return -EINVAL;
94 
95 	data = simple_transaction_get(file, buf, size);
96 	if (IS_ERR(data))
97 		return PTR_ERR(data);
98 
99 	rv =  write_op[ino](file, data, size);
100 	if (rv>0) {
101 		simple_transaction_set(file, rv);
102 		rv = size;
103 	}
104 	return rv;
105 }
106 
107 static struct file_operations transaction_ops = {
108 	.write		= nfsctl_transaction_write,
109 	.read		= simple_transaction_read,
110 	.release	= simple_transaction_release,
111 };
112 
113 extern struct seq_operations nfs_exports_op;
114 static int exports_open(struct inode *inode, struct file *file)
115 {
116 	return seq_open(file, &nfs_exports_op);
117 }
118 
119 static struct file_operations exports_operations = {
120 	.open		= exports_open,
121 	.read		= seq_read,
122 	.llseek		= seq_lseek,
123 	.release	= seq_release,
124 };
125 
126 /*----------------------------------------------------------------------------*/
127 /*
128  * payload - write methods
129  * If the method has a response, the response should be put in buf,
130  * and the length returned.  Otherwise return 0 or and -error.
131  */
132 
133 static ssize_t write_svc(struct file *file, char *buf, size_t size)
134 {
135 	struct nfsctl_svc *data;
136 	if (size < sizeof(*data))
137 		return -EINVAL;
138 	data = (struct nfsctl_svc*) buf;
139 	return nfsd_svc(data->svc_port, data->svc_nthreads);
140 }
141 
142 static ssize_t write_add(struct file *file, char *buf, size_t size)
143 {
144 	struct nfsctl_client *data;
145 	if (size < sizeof(*data))
146 		return -EINVAL;
147 	data = (struct nfsctl_client *)buf;
148 	return exp_addclient(data);
149 }
150 
151 static ssize_t write_del(struct file *file, char *buf, size_t size)
152 {
153 	struct nfsctl_client *data;
154 	if (size < sizeof(*data))
155 		return -EINVAL;
156 	data = (struct nfsctl_client *)buf;
157 	return exp_delclient(data);
158 }
159 
160 static ssize_t write_export(struct file *file, char *buf, size_t size)
161 {
162 	struct nfsctl_export *data;
163 	if (size < sizeof(*data))
164 		return -EINVAL;
165 	data = (struct nfsctl_export*)buf;
166 	return exp_export(data);
167 }
168 
169 static ssize_t write_unexport(struct file *file, char *buf, size_t size)
170 {
171 	struct nfsctl_export *data;
172 
173 	if (size < sizeof(*data))
174 		return -EINVAL;
175 	data = (struct nfsctl_export*)buf;
176 	return exp_unexport(data);
177 }
178 
179 static ssize_t write_getfs(struct file *file, char *buf, size_t size)
180 {
181 	struct nfsctl_fsparm *data;
182 	struct sockaddr_in *sin;
183 	struct auth_domain *clp;
184 	int err = 0;
185 	struct knfsd_fh *res;
186 
187 	if (size < sizeof(*data))
188 		return -EINVAL;
189 	data = (struct nfsctl_fsparm*)buf;
190 	err = -EPROTONOSUPPORT;
191 	if (data->gd_addr.sa_family != AF_INET)
192 		goto out;
193 	sin = (struct sockaddr_in *)&data->gd_addr;
194 	if (data->gd_maxlen > NFS3_FHSIZE)
195 		data->gd_maxlen = NFS3_FHSIZE;
196 
197 	res = (struct knfsd_fh*)buf;
198 
199 	exp_readlock();
200 	if (!(clp = auth_unix_lookup(sin->sin_addr)))
201 		err = -EPERM;
202 	else {
203 		err = exp_rootfh(clp, data->gd_path, res, data->gd_maxlen);
204 		auth_domain_put(clp);
205 	}
206 	exp_readunlock();
207 	if (err == 0)
208 		err = res->fh_size + (int)&((struct knfsd_fh*)0)->fh_base;
209  out:
210 	return err;
211 }
212 
213 static ssize_t write_getfd(struct file *file, char *buf, size_t size)
214 {
215 	struct nfsctl_fdparm *data;
216 	struct sockaddr_in *sin;
217 	struct auth_domain *clp;
218 	int err = 0;
219 	struct knfsd_fh fh;
220 	char *res;
221 
222 	if (size < sizeof(*data))
223 		return -EINVAL;
224 	data = (struct nfsctl_fdparm*)buf;
225 	err = -EPROTONOSUPPORT;
226 	if (data->gd_addr.sa_family != AF_INET)
227 		goto out;
228 	err = -EINVAL;
229 	if (data->gd_version < 2 || data->gd_version > NFSSVC_MAXVERS)
230 		goto out;
231 
232 	res = buf;
233 	sin = (struct sockaddr_in *)&data->gd_addr;
234 	exp_readlock();
235 	if (!(clp = auth_unix_lookup(sin->sin_addr)))
236 		err = -EPERM;
237 	else {
238 		err = exp_rootfh(clp, data->gd_path, &fh, NFS_FHSIZE);
239 		auth_domain_put(clp);
240 	}
241 	exp_readunlock();
242 
243 	if (err == 0) {
244 		memset(res,0, NFS_FHSIZE);
245 		memcpy(res, &fh.fh_base, fh.fh_size);
246 		err = NFS_FHSIZE;
247 	}
248  out:
249 	return err;
250 }
251 
252 static ssize_t write_filehandle(struct file *file, char *buf, size_t size)
253 {
254 	/* request is:
255 	 *   domain path maxsize
256 	 * response is
257 	 *   filehandle
258 	 *
259 	 * qword quoting is used, so filehandle will be \x....
260 	 */
261 	char *dname, *path;
262 	int maxsize;
263 	char *mesg = buf;
264 	int len;
265 	struct auth_domain *dom;
266 	struct knfsd_fh fh;
267 
268 	if (buf[size-1] != '\n')
269 		return -EINVAL;
270 	buf[size-1] = 0;
271 
272 	dname = mesg;
273 	len = qword_get(&mesg, dname, size);
274 	if (len <= 0) return -EINVAL;
275 
276 	path = dname+len+1;
277 	len = qword_get(&mesg, path, size);
278 	if (len <= 0) return -EINVAL;
279 
280 	len = get_int(&mesg, &maxsize);
281 	if (len)
282 		return len;
283 
284 	if (maxsize < NFS_FHSIZE)
285 		return -EINVAL;
286 	if (maxsize > NFS3_FHSIZE)
287 		maxsize = NFS3_FHSIZE;
288 
289 	if (qword_get(&mesg, mesg, size)>0)
290 		return -EINVAL;
291 
292 	/* we have all the words, they are in buf.. */
293 	dom = unix_domain_find(dname);
294 	if (!dom)
295 		return -ENOMEM;
296 
297 	len = exp_rootfh(dom, path, &fh,  maxsize);
298 	auth_domain_put(dom);
299 	if (len)
300 		return len;
301 
302 	mesg = buf; len = SIMPLE_TRANSACTION_LIMIT;
303 	qword_addhex(&mesg, &len, (char*)&fh.fh_base, fh.fh_size);
304 	mesg[-1] = '\n';
305 	return mesg - buf;
306 }
307 
308 extern int nfsd_nrthreads(void);
309 
310 static ssize_t write_threads(struct file *file, char *buf, size_t size)
311 {
312 	/* if size > 0, look for a number of threads and call nfsd_svc
313 	 * then write out number of threads as reply
314 	 */
315 	char *mesg = buf;
316 	int rv;
317 	if (size > 0) {
318 		int newthreads;
319 		rv = get_int(&mesg, &newthreads);
320 		if (rv)
321 			return rv;
322 		if (newthreads <0)
323 			return -EINVAL;
324 		rv = nfsd_svc(2049, newthreads);
325 		if (rv)
326 			return rv;
327 	}
328 	sprintf(buf, "%d\n", nfsd_nrthreads());
329 	return strlen(buf);
330 }
331 
332 extern time_t nfs4_leasetime(void);
333 
334 static ssize_t write_leasetime(struct file *file, char *buf, size_t size)
335 {
336 	/* if size > 10 seconds, call
337 	 * nfs4_reset_lease() then write out the new lease (seconds) as reply
338 	 */
339 	char *mesg = buf;
340 	int rv;
341 
342 	if (size > 0) {
343 		int lease;
344 		rv = get_int(&mesg, &lease);
345 		if (rv)
346 			return rv;
347 		if (lease < 10 || lease > 3600)
348 			return -EINVAL;
349 		nfs4_reset_lease(lease);
350 	}
351 	sprintf(buf, "%ld\n", nfs4_lease_time());
352 	return strlen(buf);
353 }
354 
355 static ssize_t write_recoverydir(struct file *file, char *buf, size_t size)
356 {
357 	char *mesg = buf;
358 	char *recdir;
359 	int len, status;
360 
361 	if (size > PATH_MAX || buf[size-1] != '\n')
362 		return -EINVAL;
363 	buf[size-1] = 0;
364 
365 	recdir = mesg;
366 	len = qword_get(&mesg, recdir, size);
367 	if (len <= 0)
368 		return -EINVAL;
369 
370 	status = nfs4_reset_recoverydir(recdir);
371 	return strlen(buf);
372 }
373 
374 /*----------------------------------------------------------------------------*/
375 /*
376  *	populating the filesystem.
377  */
378 
379 static int nfsd_fill_super(struct super_block * sb, void * data, int silent)
380 {
381 	static struct tree_descr nfsd_files[] = {
382 		[NFSD_Svc] = {".svc", &transaction_ops, S_IWUSR},
383 		[NFSD_Add] = {".add", &transaction_ops, S_IWUSR},
384 		[NFSD_Del] = {".del", &transaction_ops, S_IWUSR},
385 		[NFSD_Export] = {".export", &transaction_ops, S_IWUSR},
386 		[NFSD_Unexport] = {".unexport", &transaction_ops, S_IWUSR},
387 		[NFSD_Getfd] = {".getfd", &transaction_ops, S_IWUSR|S_IRUSR},
388 		[NFSD_Getfs] = {".getfs", &transaction_ops, S_IWUSR|S_IRUSR},
389 		[NFSD_List] = {"exports", &exports_operations, S_IRUGO},
390 		[NFSD_Fh] = {"filehandle", &transaction_ops, S_IWUSR|S_IRUSR},
391 		[NFSD_Threads] = {"threads", &transaction_ops, S_IWUSR|S_IRUSR},
392 #ifdef CONFIG_NFSD_V4
393 		[NFSD_Leasetime] = {"nfsv4leasetime", &transaction_ops, S_IWUSR|S_IRUSR},
394 		[NFSD_RecoveryDir] = {"nfsv4recoverydir", &transaction_ops, S_IWUSR|S_IRUSR},
395 #endif
396 		/* last one */ {""}
397 	};
398 	return simple_fill_super(sb, 0x6e667364, nfsd_files);
399 }
400 
401 static struct super_block *nfsd_get_sb(struct file_system_type *fs_type,
402 	int flags, const char *dev_name, void *data)
403 {
404 	return get_sb_single(fs_type, flags, data, nfsd_fill_super);
405 }
406 
407 static struct file_system_type nfsd_fs_type = {
408 	.owner		= THIS_MODULE,
409 	.name		= "nfsd",
410 	.get_sb		= nfsd_get_sb,
411 	.kill_sb	= kill_litter_super,
412 };
413 
414 static int __init init_nfsd(void)
415 {
416 	int retval;
417 	printk(KERN_INFO "Installing knfsd (copyright (C) 1996 okir@monad.swb.de).\n");
418 
419 	nfsd_stat_init();	/* Statistics */
420 	nfsd_cache_init();	/* RPC reply cache */
421 	nfsd_export_init();	/* Exports table */
422 	nfsd_lockd_init();	/* lockd->nfsd callbacks */
423 	nfs4_state_init();	/* NFSv4 locking state */
424 	nfsd_idmap_init();      /* Name to ID mapping */
425 	if (proc_mkdir("fs/nfs", NULL)) {
426 		struct proc_dir_entry *entry;
427 		entry = create_proc_entry("fs/nfs/exports", 0, NULL);
428 		if (entry)
429 			entry->proc_fops =  &exports_operations;
430 	}
431 	retval = register_filesystem(&nfsd_fs_type);
432 	if (retval) {
433 		nfsd_export_shutdown();
434 		nfsd_cache_shutdown();
435 		remove_proc_entry("fs/nfs/exports", NULL);
436 		remove_proc_entry("fs/nfs", NULL);
437 		nfsd_stat_shutdown();
438 		nfsd_lockd_shutdown();
439 	}
440 	return retval;
441 }
442 
443 static void __exit exit_nfsd(void)
444 {
445 	nfsd_export_shutdown();
446 	nfsd_cache_shutdown();
447 	remove_proc_entry("fs/nfs/exports", NULL);
448 	remove_proc_entry("fs/nfs", NULL);
449 	nfsd_stat_shutdown();
450 	nfsd_lockd_shutdown();
451 	nfsd_idmap_shutdown();
452 	unregister_filesystem(&nfsd_fs_type);
453 }
454 
455 MODULE_AUTHOR("Olaf Kirch <okir@monad.swb.de>");
456 MODULE_LICENSE("GPL");
457 module_init(init_nfsd)
458 module_exit(exit_nfsd)
459