Commit | Line | Data |
---|---|---|
1da177e4 LT |
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 | ||
1da177e4 LT |
9 | #include <linux/module.h> |
10 | ||
11 | #include <linux/linkage.h> | |
12 | #include <linux/time.h> | |
13 | #include <linux/errno.h> | |
14 | #include <linux/fs.h> | |
15 | #include <linux/fcntl.h> | |
16 | #include <linux/net.h> | |
17 | #include <linux/in.h> | |
18 | #include <linux/syscalls.h> | |
19 | #include <linux/unistd.h> | |
20 | #include <linux/slab.h> | |
21 | #include <linux/proc_fs.h> | |
22 | #include <linux/seq_file.h> | |
23 | #include <linux/pagemap.h> | |
24 | #include <linux/init.h> | |
70c3b76c | 25 | #include <linux/string.h> |
1da177e4 LT |
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, | |
70c3b76c N |
53 | NFSD_Versions, |
54 | /* | |
55 | * The below MUST come last. Otherwise we leave a hole in nfsd_files[] | |
56 | * with !CONFIG_NFSD_V4 and simple_fill_super() goes oops | |
57 | */ | |
58 | #ifdef CONFIG_NFSD_V4 | |
1da177e4 | 59 | NFSD_Leasetime, |
0964a3d3 | 60 | NFSD_RecoveryDir, |
70c3b76c | 61 | #endif |
1da177e4 LT |
62 | }; |
63 | ||
64 | /* | |
65 | * write() for these nodes. | |
66 | */ | |
67 | static ssize_t write_svc(struct file *file, char *buf, size_t size); | |
68 | static ssize_t write_add(struct file *file, char *buf, size_t size); | |
69 | static ssize_t write_del(struct file *file, char *buf, size_t size); | |
70 | static ssize_t write_export(struct file *file, char *buf, size_t size); | |
71 | static ssize_t write_unexport(struct file *file, char *buf, size_t size); | |
72 | static ssize_t write_getfd(struct file *file, char *buf, size_t size); | |
73 | static ssize_t write_getfs(struct file *file, char *buf, size_t size); | |
74 | static ssize_t write_filehandle(struct file *file, char *buf, size_t size); | |
75 | static ssize_t write_threads(struct file *file, char *buf, size_t size); | |
70c3b76c N |
76 | static ssize_t write_versions(struct file *file, char *buf, size_t size); |
77 | #ifdef CONFIG_NFSD_V4 | |
1da177e4 | 78 | static ssize_t write_leasetime(struct file *file, char *buf, size_t size); |
0964a3d3 | 79 | static ssize_t write_recoverydir(struct file *file, char *buf, size_t size); |
70c3b76c | 80 | #endif |
1da177e4 LT |
81 | |
82 | static ssize_t (*write_op[])(struct file *, char *, size_t) = { | |
83 | [NFSD_Svc] = write_svc, | |
84 | [NFSD_Add] = write_add, | |
85 | [NFSD_Del] = write_del, | |
86 | [NFSD_Export] = write_export, | |
87 | [NFSD_Unexport] = write_unexport, | |
88 | [NFSD_Getfd] = write_getfd, | |
89 | [NFSD_Getfs] = write_getfs, | |
90 | [NFSD_Fh] = write_filehandle, | |
91 | [NFSD_Threads] = write_threads, | |
70c3b76c N |
92 | [NFSD_Versions] = write_versions, |
93 | #ifdef CONFIG_NFSD_V4 | |
1da177e4 | 94 | [NFSD_Leasetime] = write_leasetime, |
0964a3d3 | 95 | [NFSD_RecoveryDir] = write_recoverydir, |
70c3b76c | 96 | #endif |
1da177e4 LT |
97 | }; |
98 | ||
99 | static ssize_t nfsctl_transaction_write(struct file *file, const char __user *buf, size_t size, loff_t *pos) | |
100 | { | |
101 | ino_t ino = file->f_dentry->d_inode->i_ino; | |
102 | char *data; | |
103 | ssize_t rv; | |
104 | ||
e8c96f8c | 105 | if (ino >= ARRAY_SIZE(write_op) || !write_op[ino]) |
1da177e4 LT |
106 | return -EINVAL; |
107 | ||
108 | data = simple_transaction_get(file, buf, size); | |
109 | if (IS_ERR(data)) | |
110 | return PTR_ERR(data); | |
111 | ||
112 | rv = write_op[ino](file, data, size); | |
113 | if (rv>0) { | |
114 | simple_transaction_set(file, rv); | |
115 | rv = size; | |
116 | } | |
117 | return rv; | |
118 | } | |
119 | ||
7390022d N |
120 | static ssize_t nfsctl_transaction_read(struct file *file, char __user *buf, size_t size, loff_t *pos) |
121 | { | |
122 | if (! file->private_data) { | |
123 | /* An attempt to read a transaction file without writing | |
124 | * causes a 0-byte write so that the file can return | |
125 | * state information | |
126 | */ | |
127 | ssize_t rv = nfsctl_transaction_write(file, buf, 0, pos); | |
128 | if (rv < 0) | |
129 | return rv; | |
130 | } | |
131 | return simple_transaction_read(file, buf, size, pos); | |
132 | } | |
133 | ||
4b6f5d20 | 134 | static const struct file_operations transaction_ops = { |
1da177e4 | 135 | .write = nfsctl_transaction_write, |
7390022d | 136 | .read = nfsctl_transaction_read, |
1da177e4 LT |
137 | .release = simple_transaction_release, |
138 | }; | |
139 | ||
140 | extern struct seq_operations nfs_exports_op; | |
141 | static int exports_open(struct inode *inode, struct file *file) | |
142 | { | |
143 | return seq_open(file, &nfs_exports_op); | |
144 | } | |
145 | ||
4b6f5d20 | 146 | static const struct file_operations exports_operations = { |
1da177e4 LT |
147 | .open = exports_open, |
148 | .read = seq_read, | |
149 | .llseek = seq_lseek, | |
150 | .release = seq_release, | |
151 | }; | |
152 | ||
153 | /*----------------------------------------------------------------------------*/ | |
154 | /* | |
155 | * payload - write methods | |
156 | * If the method has a response, the response should be put in buf, | |
157 | * and the length returned. Otherwise return 0 or and -error. | |
158 | */ | |
159 | ||
160 | static ssize_t write_svc(struct file *file, char *buf, size_t size) | |
161 | { | |
162 | struct nfsctl_svc *data; | |
163 | if (size < sizeof(*data)) | |
164 | return -EINVAL; | |
165 | data = (struct nfsctl_svc*) buf; | |
166 | return nfsd_svc(data->svc_port, data->svc_nthreads); | |
167 | } | |
168 | ||
169 | static ssize_t write_add(struct file *file, char *buf, size_t size) | |
170 | { | |
171 | struct nfsctl_client *data; | |
172 | if (size < sizeof(*data)) | |
173 | return -EINVAL; | |
174 | data = (struct nfsctl_client *)buf; | |
175 | return exp_addclient(data); | |
176 | } | |
177 | ||
178 | static ssize_t write_del(struct file *file, char *buf, size_t size) | |
179 | { | |
180 | struct nfsctl_client *data; | |
181 | if (size < sizeof(*data)) | |
182 | return -EINVAL; | |
183 | data = (struct nfsctl_client *)buf; | |
184 | return exp_delclient(data); | |
185 | } | |
186 | ||
187 | static ssize_t write_export(struct file *file, char *buf, size_t size) | |
188 | { | |
189 | struct nfsctl_export *data; | |
190 | if (size < sizeof(*data)) | |
191 | return -EINVAL; | |
192 | data = (struct nfsctl_export*)buf; | |
193 | return exp_export(data); | |
194 | } | |
195 | ||
196 | static ssize_t write_unexport(struct file *file, char *buf, size_t size) | |
197 | { | |
198 | struct nfsctl_export *data; | |
199 | ||
200 | if (size < sizeof(*data)) | |
201 | return -EINVAL; | |
202 | data = (struct nfsctl_export*)buf; | |
203 | return exp_unexport(data); | |
204 | } | |
205 | ||
206 | static ssize_t write_getfs(struct file *file, char *buf, size_t size) | |
207 | { | |
208 | struct nfsctl_fsparm *data; | |
209 | struct sockaddr_in *sin; | |
210 | struct auth_domain *clp; | |
211 | int err = 0; | |
212 | struct knfsd_fh *res; | |
213 | ||
214 | if (size < sizeof(*data)) | |
215 | return -EINVAL; | |
216 | data = (struct nfsctl_fsparm*)buf; | |
217 | err = -EPROTONOSUPPORT; | |
218 | if (data->gd_addr.sa_family != AF_INET) | |
219 | goto out; | |
220 | sin = (struct sockaddr_in *)&data->gd_addr; | |
221 | if (data->gd_maxlen > NFS3_FHSIZE) | |
222 | data->gd_maxlen = NFS3_FHSIZE; | |
223 | ||
224 | res = (struct knfsd_fh*)buf; | |
225 | ||
226 | exp_readlock(); | |
227 | if (!(clp = auth_unix_lookup(sin->sin_addr))) | |
228 | err = -EPERM; | |
229 | else { | |
230 | err = exp_rootfh(clp, data->gd_path, res, data->gd_maxlen); | |
231 | auth_domain_put(clp); | |
232 | } | |
233 | exp_readunlock(); | |
234 | if (err == 0) | |
235 | err = res->fh_size + (int)&((struct knfsd_fh*)0)->fh_base; | |
236 | out: | |
237 | return err; | |
238 | } | |
239 | ||
240 | static ssize_t write_getfd(struct file *file, char *buf, size_t size) | |
241 | { | |
242 | struct nfsctl_fdparm *data; | |
243 | struct sockaddr_in *sin; | |
244 | struct auth_domain *clp; | |
245 | int err = 0; | |
246 | struct knfsd_fh fh; | |
247 | char *res; | |
248 | ||
249 | if (size < sizeof(*data)) | |
250 | return -EINVAL; | |
251 | data = (struct nfsctl_fdparm*)buf; | |
252 | err = -EPROTONOSUPPORT; | |
253 | if (data->gd_addr.sa_family != AF_INET) | |
254 | goto out; | |
255 | err = -EINVAL; | |
256 | if (data->gd_version < 2 || data->gd_version > NFSSVC_MAXVERS) | |
257 | goto out; | |
258 | ||
259 | res = buf; | |
260 | sin = (struct sockaddr_in *)&data->gd_addr; | |
261 | exp_readlock(); | |
262 | if (!(clp = auth_unix_lookup(sin->sin_addr))) | |
263 | err = -EPERM; | |
264 | else { | |
265 | err = exp_rootfh(clp, data->gd_path, &fh, NFS_FHSIZE); | |
266 | auth_domain_put(clp); | |
267 | } | |
268 | exp_readunlock(); | |
269 | ||
270 | if (err == 0) { | |
271 | memset(res,0, NFS_FHSIZE); | |
272 | memcpy(res, &fh.fh_base, fh.fh_size); | |
273 | err = NFS_FHSIZE; | |
274 | } | |
275 | out: | |
276 | return err; | |
277 | } | |
278 | ||
279 | static ssize_t write_filehandle(struct file *file, char *buf, size_t size) | |
280 | { | |
281 | /* request is: | |
282 | * domain path maxsize | |
283 | * response is | |
284 | * filehandle | |
285 | * | |
286 | * qword quoting is used, so filehandle will be \x.... | |
287 | */ | |
288 | char *dname, *path; | |
289 | int maxsize; | |
290 | char *mesg = buf; | |
291 | int len; | |
292 | struct auth_domain *dom; | |
293 | struct knfsd_fh fh; | |
294 | ||
295 | if (buf[size-1] != '\n') | |
296 | return -EINVAL; | |
297 | buf[size-1] = 0; | |
298 | ||
299 | dname = mesg; | |
300 | len = qword_get(&mesg, dname, size); | |
301 | if (len <= 0) return -EINVAL; | |
302 | ||
303 | path = dname+len+1; | |
304 | len = qword_get(&mesg, path, size); | |
305 | if (len <= 0) return -EINVAL; | |
306 | ||
307 | len = get_int(&mesg, &maxsize); | |
308 | if (len) | |
309 | return len; | |
310 | ||
311 | if (maxsize < NFS_FHSIZE) | |
312 | return -EINVAL; | |
313 | if (maxsize > NFS3_FHSIZE) | |
314 | maxsize = NFS3_FHSIZE; | |
315 | ||
316 | if (qword_get(&mesg, mesg, size)>0) | |
317 | return -EINVAL; | |
318 | ||
319 | /* we have all the words, they are in buf.. */ | |
320 | dom = unix_domain_find(dname); | |
321 | if (!dom) | |
322 | return -ENOMEM; | |
323 | ||
324 | len = exp_rootfh(dom, path, &fh, maxsize); | |
325 | auth_domain_put(dom); | |
326 | if (len) | |
327 | return len; | |
328 | ||
329 | mesg = buf; len = SIMPLE_TRANSACTION_LIMIT; | |
330 | qword_addhex(&mesg, &len, (char*)&fh.fh_base, fh.fh_size); | |
331 | mesg[-1] = '\n'; | |
332 | return mesg - buf; | |
333 | } | |
334 | ||
335 | extern int nfsd_nrthreads(void); | |
336 | ||
337 | static ssize_t write_threads(struct file *file, char *buf, size_t size) | |
338 | { | |
339 | /* if size > 0, look for a number of threads and call nfsd_svc | |
340 | * then write out number of threads as reply | |
341 | */ | |
342 | char *mesg = buf; | |
343 | int rv; | |
344 | if (size > 0) { | |
345 | int newthreads; | |
346 | rv = get_int(&mesg, &newthreads); | |
347 | if (rv) | |
348 | return rv; | |
349 | if (newthreads <0) | |
350 | return -EINVAL; | |
351 | rv = nfsd_svc(2049, newthreads); | |
352 | if (rv) | |
353 | return rv; | |
354 | } | |
355 | sprintf(buf, "%d\n", nfsd_nrthreads()); | |
356 | return strlen(buf); | |
357 | } | |
358 | ||
70c3b76c N |
359 | static ssize_t write_versions(struct file *file, char *buf, size_t size) |
360 | { | |
361 | /* | |
362 | * Format: | |
363 | * [-/+]vers [-/+]vers ... | |
364 | */ | |
365 | char *mesg = buf; | |
366 | char *vers, sign; | |
367 | int len, num; | |
368 | ssize_t tlen = 0; | |
369 | char *sep; | |
370 | ||
371 | if (size>0) { | |
372 | if (nfsd_serv) | |
6658d3a7 N |
373 | /* Cannot change versions without updating |
374 | * nfsd_serv->sv_xdrsize, and reallocing | |
375 | * rq_argp and rq_resp | |
376 | */ | |
70c3b76c N |
377 | return -EBUSY; |
378 | if (buf[size-1] != '\n') | |
379 | return -EINVAL; | |
380 | buf[size-1] = 0; | |
381 | ||
382 | vers = mesg; | |
383 | len = qword_get(&mesg, vers, size); | |
384 | if (len <= 0) return -EINVAL; | |
385 | do { | |
386 | sign = *vers; | |
387 | if (sign == '+' || sign == '-') | |
388 | num = simple_strtol((vers+1), NULL, 0); | |
389 | else | |
390 | num = simple_strtol(vers, NULL, 0); | |
391 | switch(num) { | |
392 | case 2: | |
393 | case 3: | |
394 | case 4: | |
6658d3a7 | 395 | nfsd_vers(num, sign == '-' ? NFSD_CLEAR : NFSD_SET); |
70c3b76c N |
396 | break; |
397 | default: | |
398 | return -EINVAL; | |
399 | } | |
400 | vers += len + 1; | |
401 | tlen += len; | |
402 | } while ((len = qword_get(&mesg, vers, size)) > 0); | |
403 | /* If all get turned off, turn them back on, as | |
404 | * having no versions is BAD | |
405 | */ | |
6658d3a7 | 406 | nfsd_reset_versions(); |
70c3b76c N |
407 | } |
408 | /* Now write current state into reply buffer */ | |
409 | len = 0; | |
410 | sep = ""; | |
411 | for (num=2 ; num <= 4 ; num++) | |
6658d3a7 | 412 | if (nfsd_vers(num, NFSD_AVAIL)) { |
70c3b76c | 413 | len += sprintf(buf+len, "%s%c%d", sep, |
6658d3a7 | 414 | nfsd_vers(num, NFSD_TEST)?'+':'-', |
70c3b76c N |
415 | num); |
416 | sep = " "; | |
417 | } | |
418 | len += sprintf(buf+len, "\n"); | |
419 | return len; | |
420 | } | |
421 | ||
422 | #ifdef CONFIG_NFSD_V4 | |
1da177e4 LT |
423 | extern time_t nfs4_leasetime(void); |
424 | ||
425 | static ssize_t write_leasetime(struct file *file, char *buf, size_t size) | |
426 | { | |
427 | /* if size > 10 seconds, call | |
428 | * nfs4_reset_lease() then write out the new lease (seconds) as reply | |
429 | */ | |
430 | char *mesg = buf; | |
431 | int rv; | |
432 | ||
433 | if (size > 0) { | |
434 | int lease; | |
435 | rv = get_int(&mesg, &lease); | |
436 | if (rv) | |
437 | return rv; | |
438 | if (lease < 10 || lease > 3600) | |
439 | return -EINVAL; | |
440 | nfs4_reset_lease(lease); | |
441 | } | |
442 | sprintf(buf, "%ld\n", nfs4_lease_time()); | |
443 | return strlen(buf); | |
444 | } | |
445 | ||
0964a3d3 N |
446 | static ssize_t write_recoverydir(struct file *file, char *buf, size_t size) |
447 | { | |
448 | char *mesg = buf; | |
449 | char *recdir; | |
450 | int len, status; | |
451 | ||
452 | if (size > PATH_MAX || buf[size-1] != '\n') | |
453 | return -EINVAL; | |
454 | buf[size-1] = 0; | |
455 | ||
456 | recdir = mesg; | |
457 | len = qword_get(&mesg, recdir, size); | |
458 | if (len <= 0) | |
459 | return -EINVAL; | |
460 | ||
461 | status = nfs4_reset_recoverydir(recdir); | |
462 | return strlen(buf); | |
463 | } | |
70c3b76c | 464 | #endif |
0964a3d3 | 465 | |
1da177e4 LT |
466 | /*----------------------------------------------------------------------------*/ |
467 | /* | |
468 | * populating the filesystem. | |
469 | */ | |
470 | ||
471 | static int nfsd_fill_super(struct super_block * sb, void * data, int silent) | |
472 | { | |
473 | static struct tree_descr nfsd_files[] = { | |
474 | [NFSD_Svc] = {".svc", &transaction_ops, S_IWUSR}, | |
475 | [NFSD_Add] = {".add", &transaction_ops, S_IWUSR}, | |
476 | [NFSD_Del] = {".del", &transaction_ops, S_IWUSR}, | |
477 | [NFSD_Export] = {".export", &transaction_ops, S_IWUSR}, | |
478 | [NFSD_Unexport] = {".unexport", &transaction_ops, S_IWUSR}, | |
479 | [NFSD_Getfd] = {".getfd", &transaction_ops, S_IWUSR|S_IRUSR}, | |
480 | [NFSD_Getfs] = {".getfs", &transaction_ops, S_IWUSR|S_IRUSR}, | |
481 | [NFSD_List] = {"exports", &exports_operations, S_IRUGO}, | |
482 | [NFSD_Fh] = {"filehandle", &transaction_ops, S_IWUSR|S_IRUSR}, | |
483 | [NFSD_Threads] = {"threads", &transaction_ops, S_IWUSR|S_IRUSR}, | |
70c3b76c | 484 | [NFSD_Versions] = {"versions", &transaction_ops, S_IWUSR|S_IRUSR}, |
1da177e4 LT |
485 | #ifdef CONFIG_NFSD_V4 |
486 | [NFSD_Leasetime] = {"nfsv4leasetime", &transaction_ops, S_IWUSR|S_IRUSR}, | |
0964a3d3 | 487 | [NFSD_RecoveryDir] = {"nfsv4recoverydir", &transaction_ops, S_IWUSR|S_IRUSR}, |
1da177e4 LT |
488 | #endif |
489 | /* last one */ {""} | |
490 | }; | |
491 | return simple_fill_super(sb, 0x6e667364, nfsd_files); | |
492 | } | |
493 | ||
454e2398 DH |
494 | static int nfsd_get_sb(struct file_system_type *fs_type, |
495 | int flags, const char *dev_name, void *data, struct vfsmount *mnt) | |
1da177e4 | 496 | { |
454e2398 | 497 | return get_sb_single(fs_type, flags, data, nfsd_fill_super, mnt); |
1da177e4 LT |
498 | } |
499 | ||
500 | static struct file_system_type nfsd_fs_type = { | |
501 | .owner = THIS_MODULE, | |
502 | .name = "nfsd", | |
503 | .get_sb = nfsd_get_sb, | |
504 | .kill_sb = kill_litter_super, | |
505 | }; | |
506 | ||
507 | static int __init init_nfsd(void) | |
508 | { | |
509 | int retval; | |
510 | printk(KERN_INFO "Installing knfsd (copyright (C) 1996 okir@monad.swb.de).\n"); | |
511 | ||
512 | nfsd_stat_init(); /* Statistics */ | |
513 | nfsd_cache_init(); /* RPC reply cache */ | |
514 | nfsd_export_init(); /* Exports table */ | |
515 | nfsd_lockd_init(); /* lockd->nfsd callbacks */ | |
ac4d8ff2 | 516 | nfs4_state_init(); /* NFSv4 locking state */ |
1da177e4 | 517 | nfsd_idmap_init(); /* Name to ID mapping */ |
1da177e4 LT |
518 | if (proc_mkdir("fs/nfs", NULL)) { |
519 | struct proc_dir_entry *entry; | |
520 | entry = create_proc_entry("fs/nfs/exports", 0, NULL); | |
521 | if (entry) | |
522 | entry->proc_fops = &exports_operations; | |
523 | } | |
524 | retval = register_filesystem(&nfsd_fs_type); | |
525 | if (retval) { | |
526 | nfsd_export_shutdown(); | |
527 | nfsd_cache_shutdown(); | |
528 | remove_proc_entry("fs/nfs/exports", NULL); | |
529 | remove_proc_entry("fs/nfs", NULL); | |
530 | nfsd_stat_shutdown(); | |
531 | nfsd_lockd_shutdown(); | |
532 | } | |
533 | return retval; | |
534 | } | |
535 | ||
536 | static void __exit exit_nfsd(void) | |
537 | { | |
538 | nfsd_export_shutdown(); | |
539 | nfsd_cache_shutdown(); | |
540 | remove_proc_entry("fs/nfs/exports", NULL); | |
541 | remove_proc_entry("fs/nfs", NULL); | |
542 | nfsd_stat_shutdown(); | |
543 | nfsd_lockd_shutdown(); | |
1da177e4 | 544 | nfsd_idmap_shutdown(); |
1da177e4 LT |
545 | unregister_filesystem(&nfsd_fs_type); |
546 | } | |
547 | ||
548 | MODULE_AUTHOR("Olaf Kirch <okir@monad.swb.de>"); | |
549 | MODULE_LICENSE("GPL"); | |
550 | module_init(init_nfsd) | |
551 | module_exit(exit_nfsd) |