]>
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 | ||
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> | |
70c3b76c | 26 | #include <linux/string.h> |
1da177e4 LT |
27 | |
28 | #include <linux/nfs.h> | |
29 | #include <linux/nfsd_idmap.h> | |
30 | #include <linux/sunrpc/svc.h> | |
31 | #include <linux/nfsd/nfsd.h> | |
32 | #include <linux/nfsd/cache.h> | |
33 | #include <linux/nfsd/xdr.h> | |
34 | #include <linux/nfsd/syscall.h> | |
35 | #include <linux/nfsd/interface.h> | |
36 | ||
37 | #include <asm/uaccess.h> | |
38 | ||
70c3b76c N |
39 | unsigned int nfsd_versbits = ~0; |
40 | ||
1da177e4 LT |
41 | /* |
42 | * We have a single directory with 9 nodes in it. | |
43 | */ | |
44 | enum { | |
45 | NFSD_Root = 1, | |
46 | NFSD_Svc, | |
47 | NFSD_Add, | |
48 | NFSD_Del, | |
49 | NFSD_Export, | |
50 | NFSD_Unexport, | |
51 | NFSD_Getfd, | |
52 | NFSD_Getfs, | |
53 | NFSD_List, | |
54 | NFSD_Fh, | |
55 | NFSD_Threads, | |
70c3b76c N |
56 | NFSD_Versions, |
57 | /* | |
58 | * The below MUST come last. Otherwise we leave a hole in nfsd_files[] | |
59 | * with !CONFIG_NFSD_V4 and simple_fill_super() goes oops | |
60 | */ | |
61 | #ifdef CONFIG_NFSD_V4 | |
1da177e4 | 62 | NFSD_Leasetime, |
0964a3d3 | 63 | NFSD_RecoveryDir, |
70c3b76c | 64 | #endif |
1da177e4 LT |
65 | }; |
66 | ||
67 | /* | |
68 | * write() for these nodes. | |
69 | */ | |
70 | static ssize_t write_svc(struct file *file, char *buf, size_t size); | |
71 | static ssize_t write_add(struct file *file, char *buf, size_t size); | |
72 | static ssize_t write_del(struct file *file, char *buf, size_t size); | |
73 | static ssize_t write_export(struct file *file, char *buf, size_t size); | |
74 | static ssize_t write_unexport(struct file *file, char *buf, size_t size); | |
75 | static ssize_t write_getfd(struct file *file, char *buf, size_t size); | |
76 | static ssize_t write_getfs(struct file *file, char *buf, size_t size); | |
77 | static ssize_t write_filehandle(struct file *file, char *buf, size_t size); | |
78 | static ssize_t write_threads(struct file *file, char *buf, size_t size); | |
70c3b76c N |
79 | static ssize_t write_versions(struct file *file, char *buf, size_t size); |
80 | #ifdef CONFIG_NFSD_V4 | |
1da177e4 | 81 | static ssize_t write_leasetime(struct file *file, char *buf, size_t size); |
0964a3d3 | 82 | static ssize_t write_recoverydir(struct file *file, char *buf, size_t size); |
70c3b76c | 83 | #endif |
1da177e4 LT |
84 | |
85 | static ssize_t (*write_op[])(struct file *, char *, size_t) = { | |
86 | [NFSD_Svc] = write_svc, | |
87 | [NFSD_Add] = write_add, | |
88 | [NFSD_Del] = write_del, | |
89 | [NFSD_Export] = write_export, | |
90 | [NFSD_Unexport] = write_unexport, | |
91 | [NFSD_Getfd] = write_getfd, | |
92 | [NFSD_Getfs] = write_getfs, | |
93 | [NFSD_Fh] = write_filehandle, | |
94 | [NFSD_Threads] = write_threads, | |
70c3b76c N |
95 | [NFSD_Versions] = write_versions, |
96 | #ifdef CONFIG_NFSD_V4 | |
1da177e4 | 97 | [NFSD_Leasetime] = write_leasetime, |
0964a3d3 | 98 | [NFSD_RecoveryDir] = write_recoverydir, |
70c3b76c | 99 | #endif |
1da177e4 LT |
100 | }; |
101 | ||
102 | static ssize_t nfsctl_transaction_write(struct file *file, const char __user *buf, size_t size, loff_t *pos) | |
103 | { | |
104 | ino_t ino = file->f_dentry->d_inode->i_ino; | |
105 | char *data; | |
106 | ssize_t rv; | |
107 | ||
e8c96f8c | 108 | if (ino >= ARRAY_SIZE(write_op) || !write_op[ino]) |
1da177e4 LT |
109 | return -EINVAL; |
110 | ||
111 | data = simple_transaction_get(file, buf, size); | |
112 | if (IS_ERR(data)) | |
113 | return PTR_ERR(data); | |
114 | ||
115 | rv = write_op[ino](file, data, size); | |
116 | if (rv>0) { | |
117 | simple_transaction_set(file, rv); | |
118 | rv = size; | |
119 | } | |
120 | return rv; | |
121 | } | |
122 | ||
7390022d N |
123 | static ssize_t nfsctl_transaction_read(struct file *file, char __user *buf, size_t size, loff_t *pos) |
124 | { | |
125 | if (! file->private_data) { | |
126 | /* An attempt to read a transaction file without writing | |
127 | * causes a 0-byte write so that the file can return | |
128 | * state information | |
129 | */ | |
130 | ssize_t rv = nfsctl_transaction_write(file, buf, 0, pos); | |
131 | if (rv < 0) | |
132 | return rv; | |
133 | } | |
134 | return simple_transaction_read(file, buf, size, pos); | |
135 | } | |
136 | ||
4b6f5d20 | 137 | static const struct file_operations transaction_ops = { |
1da177e4 | 138 | .write = nfsctl_transaction_write, |
7390022d | 139 | .read = nfsctl_transaction_read, |
1da177e4 LT |
140 | .release = simple_transaction_release, |
141 | }; | |
142 | ||
143 | extern struct seq_operations nfs_exports_op; | |
144 | static int exports_open(struct inode *inode, struct file *file) | |
145 | { | |
146 | return seq_open(file, &nfs_exports_op); | |
147 | } | |
148 | ||
4b6f5d20 | 149 | static const struct file_operations exports_operations = { |
1da177e4 LT |
150 | .open = exports_open, |
151 | .read = seq_read, | |
152 | .llseek = seq_lseek, | |
153 | .release = seq_release, | |
154 | }; | |
155 | ||
156 | /*----------------------------------------------------------------------------*/ | |
157 | /* | |
158 | * payload - write methods | |
159 | * If the method has a response, the response should be put in buf, | |
160 | * and the length returned. Otherwise return 0 or and -error. | |
161 | */ | |
162 | ||
163 | static ssize_t write_svc(struct file *file, char *buf, size_t size) | |
164 | { | |
165 | struct nfsctl_svc *data; | |
166 | if (size < sizeof(*data)) | |
167 | return -EINVAL; | |
168 | data = (struct nfsctl_svc*) buf; | |
169 | return nfsd_svc(data->svc_port, data->svc_nthreads); | |
170 | } | |
171 | ||
172 | static ssize_t write_add(struct file *file, char *buf, size_t size) | |
173 | { | |
174 | struct nfsctl_client *data; | |
175 | if (size < sizeof(*data)) | |
176 | return -EINVAL; | |
177 | data = (struct nfsctl_client *)buf; | |
178 | return exp_addclient(data); | |
179 | } | |
180 | ||
181 | static ssize_t write_del(struct file *file, char *buf, size_t size) | |
182 | { | |
183 | struct nfsctl_client *data; | |
184 | if (size < sizeof(*data)) | |
185 | return -EINVAL; | |
186 | data = (struct nfsctl_client *)buf; | |
187 | return exp_delclient(data); | |
188 | } | |
189 | ||
190 | static ssize_t write_export(struct file *file, char *buf, size_t size) | |
191 | { | |
192 | struct nfsctl_export *data; | |
193 | if (size < sizeof(*data)) | |
194 | return -EINVAL; | |
195 | data = (struct nfsctl_export*)buf; | |
196 | return exp_export(data); | |
197 | } | |
198 | ||
199 | static ssize_t write_unexport(struct file *file, char *buf, size_t size) | |
200 | { | |
201 | struct nfsctl_export *data; | |
202 | ||
203 | if (size < sizeof(*data)) | |
204 | return -EINVAL; | |
205 | data = (struct nfsctl_export*)buf; | |
206 | return exp_unexport(data); | |
207 | } | |
208 | ||
209 | static ssize_t write_getfs(struct file *file, char *buf, size_t size) | |
210 | { | |
211 | struct nfsctl_fsparm *data; | |
212 | struct sockaddr_in *sin; | |
213 | struct auth_domain *clp; | |
214 | int err = 0; | |
215 | struct knfsd_fh *res; | |
216 | ||
217 | if (size < sizeof(*data)) | |
218 | return -EINVAL; | |
219 | data = (struct nfsctl_fsparm*)buf; | |
220 | err = -EPROTONOSUPPORT; | |
221 | if (data->gd_addr.sa_family != AF_INET) | |
222 | goto out; | |
223 | sin = (struct sockaddr_in *)&data->gd_addr; | |
224 | if (data->gd_maxlen > NFS3_FHSIZE) | |
225 | data->gd_maxlen = NFS3_FHSIZE; | |
226 | ||
227 | res = (struct knfsd_fh*)buf; | |
228 | ||
229 | exp_readlock(); | |
230 | if (!(clp = auth_unix_lookup(sin->sin_addr))) | |
231 | err = -EPERM; | |
232 | else { | |
233 | err = exp_rootfh(clp, data->gd_path, res, data->gd_maxlen); | |
234 | auth_domain_put(clp); | |
235 | } | |
236 | exp_readunlock(); | |
237 | if (err == 0) | |
238 | err = res->fh_size + (int)&((struct knfsd_fh*)0)->fh_base; | |
239 | out: | |
240 | return err; | |
241 | } | |
242 | ||
243 | static ssize_t write_getfd(struct file *file, char *buf, size_t size) | |
244 | { | |
245 | struct nfsctl_fdparm *data; | |
246 | struct sockaddr_in *sin; | |
247 | struct auth_domain *clp; | |
248 | int err = 0; | |
249 | struct knfsd_fh fh; | |
250 | char *res; | |
251 | ||
252 | if (size < sizeof(*data)) | |
253 | return -EINVAL; | |
254 | data = (struct nfsctl_fdparm*)buf; | |
255 | err = -EPROTONOSUPPORT; | |
256 | if (data->gd_addr.sa_family != AF_INET) | |
257 | goto out; | |
258 | err = -EINVAL; | |
259 | if (data->gd_version < 2 || data->gd_version > NFSSVC_MAXVERS) | |
260 | goto out; | |
261 | ||
262 | res = buf; | |
263 | sin = (struct sockaddr_in *)&data->gd_addr; | |
264 | exp_readlock(); | |
265 | if (!(clp = auth_unix_lookup(sin->sin_addr))) | |
266 | err = -EPERM; | |
267 | else { | |
268 | err = exp_rootfh(clp, data->gd_path, &fh, NFS_FHSIZE); | |
269 | auth_domain_put(clp); | |
270 | } | |
271 | exp_readunlock(); | |
272 | ||
273 | if (err == 0) { | |
274 | memset(res,0, NFS_FHSIZE); | |
275 | memcpy(res, &fh.fh_base, fh.fh_size); | |
276 | err = NFS_FHSIZE; | |
277 | } | |
278 | out: | |
279 | return err; | |
280 | } | |
281 | ||
282 | static ssize_t write_filehandle(struct file *file, char *buf, size_t size) | |
283 | { | |
284 | /* request is: | |
285 | * domain path maxsize | |
286 | * response is | |
287 | * filehandle | |
288 | * | |
289 | * qword quoting is used, so filehandle will be \x.... | |
290 | */ | |
291 | char *dname, *path; | |
292 | int maxsize; | |
293 | char *mesg = buf; | |
294 | int len; | |
295 | struct auth_domain *dom; | |
296 | struct knfsd_fh fh; | |
297 | ||
298 | if (buf[size-1] != '\n') | |
299 | return -EINVAL; | |
300 | buf[size-1] = 0; | |
301 | ||
302 | dname = mesg; | |
303 | len = qword_get(&mesg, dname, size); | |
304 | if (len <= 0) return -EINVAL; | |
305 | ||
306 | path = dname+len+1; | |
307 | len = qword_get(&mesg, path, size); | |
308 | if (len <= 0) return -EINVAL; | |
309 | ||
310 | len = get_int(&mesg, &maxsize); | |
311 | if (len) | |
312 | return len; | |
313 | ||
314 | if (maxsize < NFS_FHSIZE) | |
315 | return -EINVAL; | |
316 | if (maxsize > NFS3_FHSIZE) | |
317 | maxsize = NFS3_FHSIZE; | |
318 | ||
319 | if (qword_get(&mesg, mesg, size)>0) | |
320 | return -EINVAL; | |
321 | ||
322 | /* we have all the words, they are in buf.. */ | |
323 | dom = unix_domain_find(dname); | |
324 | if (!dom) | |
325 | return -ENOMEM; | |
326 | ||
327 | len = exp_rootfh(dom, path, &fh, maxsize); | |
328 | auth_domain_put(dom); | |
329 | if (len) | |
330 | return len; | |
331 | ||
332 | mesg = buf; len = SIMPLE_TRANSACTION_LIMIT; | |
333 | qword_addhex(&mesg, &len, (char*)&fh.fh_base, fh.fh_size); | |
334 | mesg[-1] = '\n'; | |
335 | return mesg - buf; | |
336 | } | |
337 | ||
338 | extern int nfsd_nrthreads(void); | |
339 | ||
340 | static ssize_t write_threads(struct file *file, char *buf, size_t size) | |
341 | { | |
342 | /* if size > 0, look for a number of threads and call nfsd_svc | |
343 | * then write out number of threads as reply | |
344 | */ | |
345 | char *mesg = buf; | |
346 | int rv; | |
347 | if (size > 0) { | |
348 | int newthreads; | |
349 | rv = get_int(&mesg, &newthreads); | |
350 | if (rv) | |
351 | return rv; | |
352 | if (newthreads <0) | |
353 | return -EINVAL; | |
354 | rv = nfsd_svc(2049, newthreads); | |
355 | if (rv) | |
356 | return rv; | |
357 | } | |
358 | sprintf(buf, "%d\n", nfsd_nrthreads()); | |
359 | return strlen(buf); | |
360 | } | |
361 | ||
70c3b76c N |
362 | static ssize_t write_versions(struct file *file, char *buf, size_t size) |
363 | { | |
364 | /* | |
365 | * Format: | |
366 | * [-/+]vers [-/+]vers ... | |
367 | */ | |
368 | char *mesg = buf; | |
369 | char *vers, sign; | |
370 | int len, num; | |
371 | ssize_t tlen = 0; | |
372 | char *sep; | |
373 | ||
374 | if (size>0) { | |
375 | if (nfsd_serv) | |
376 | return -EBUSY; | |
377 | if (buf[size-1] != '\n') | |
378 | return -EINVAL; | |
379 | buf[size-1] = 0; | |
380 | ||
381 | vers = mesg; | |
382 | len = qword_get(&mesg, vers, size); | |
383 | if (len <= 0) return -EINVAL; | |
384 | do { | |
385 | sign = *vers; | |
386 | if (sign == '+' || sign == '-') | |
387 | num = simple_strtol((vers+1), NULL, 0); | |
388 | else | |
389 | num = simple_strtol(vers, NULL, 0); | |
390 | switch(num) { | |
391 | case 2: | |
392 | case 3: | |
393 | case 4: | |
394 | if (sign != '-') | |
395 | NFSCTL_VERSET(nfsd_versbits, num); | |
396 | else | |
397 | NFSCTL_VERUNSET(nfsd_versbits, num); | |
398 | break; | |
399 | default: | |
400 | return -EINVAL; | |
401 | } | |
402 | vers += len + 1; | |
403 | tlen += len; | |
404 | } while ((len = qword_get(&mesg, vers, size)) > 0); | |
405 | /* If all get turned off, turn them back on, as | |
406 | * having no versions is BAD | |
407 | */ | |
408 | if ((nfsd_versbits & NFSCTL_VERALL)==0) | |
409 | nfsd_versbits = NFSCTL_VERALL; | |
410 | } | |
411 | /* Now write current state into reply buffer */ | |
412 | len = 0; | |
413 | sep = ""; | |
414 | for (num=2 ; num <= 4 ; num++) | |
415 | if (NFSCTL_VERISSET(NFSCTL_VERALL, num)) { | |
416 | len += sprintf(buf+len, "%s%c%d", sep, | |
417 | NFSCTL_VERISSET(nfsd_versbits, num)?'+':'-', | |
418 | num); | |
419 | sep = " "; | |
420 | } | |
421 | len += sprintf(buf+len, "\n"); | |
422 | return len; | |
423 | } | |
424 | ||
425 | #ifdef CONFIG_NFSD_V4 | |
1da177e4 LT |
426 | extern time_t nfs4_leasetime(void); |
427 | ||
428 | static ssize_t write_leasetime(struct file *file, char *buf, size_t size) | |
429 | { | |
430 | /* if size > 10 seconds, call | |
431 | * nfs4_reset_lease() then write out the new lease (seconds) as reply | |
432 | */ | |
433 | char *mesg = buf; | |
434 | int rv; | |
435 | ||
436 | if (size > 0) { | |
437 | int lease; | |
438 | rv = get_int(&mesg, &lease); | |
439 | if (rv) | |
440 | return rv; | |
441 | if (lease < 10 || lease > 3600) | |
442 | return -EINVAL; | |
443 | nfs4_reset_lease(lease); | |
444 | } | |
445 | sprintf(buf, "%ld\n", nfs4_lease_time()); | |
446 | return strlen(buf); | |
447 | } | |
448 | ||
0964a3d3 N |
449 | static ssize_t write_recoverydir(struct file *file, char *buf, size_t size) |
450 | { | |
451 | char *mesg = buf; | |
452 | char *recdir; | |
453 | int len, status; | |
454 | ||
455 | if (size > PATH_MAX || buf[size-1] != '\n') | |
456 | return -EINVAL; | |
457 | buf[size-1] = 0; | |
458 | ||
459 | recdir = mesg; | |
460 | len = qword_get(&mesg, recdir, size); | |
461 | if (len <= 0) | |
462 | return -EINVAL; | |
463 | ||
464 | status = nfs4_reset_recoverydir(recdir); | |
465 | return strlen(buf); | |
466 | } | |
70c3b76c | 467 | #endif |
0964a3d3 | 468 | |
1da177e4 LT |
469 | /*----------------------------------------------------------------------------*/ |
470 | /* | |
471 | * populating the filesystem. | |
472 | */ | |
473 | ||
474 | static int nfsd_fill_super(struct super_block * sb, void * data, int silent) | |
475 | { | |
476 | static struct tree_descr nfsd_files[] = { | |
477 | [NFSD_Svc] = {".svc", &transaction_ops, S_IWUSR}, | |
478 | [NFSD_Add] = {".add", &transaction_ops, S_IWUSR}, | |
479 | [NFSD_Del] = {".del", &transaction_ops, S_IWUSR}, | |
480 | [NFSD_Export] = {".export", &transaction_ops, S_IWUSR}, | |
481 | [NFSD_Unexport] = {".unexport", &transaction_ops, S_IWUSR}, | |
482 | [NFSD_Getfd] = {".getfd", &transaction_ops, S_IWUSR|S_IRUSR}, | |
483 | [NFSD_Getfs] = {".getfs", &transaction_ops, S_IWUSR|S_IRUSR}, | |
484 | [NFSD_List] = {"exports", &exports_operations, S_IRUGO}, | |
485 | [NFSD_Fh] = {"filehandle", &transaction_ops, S_IWUSR|S_IRUSR}, | |
486 | [NFSD_Threads] = {"threads", &transaction_ops, S_IWUSR|S_IRUSR}, | |
70c3b76c | 487 | [NFSD_Versions] = {"versions", &transaction_ops, S_IWUSR|S_IRUSR}, |
1da177e4 LT |
488 | #ifdef CONFIG_NFSD_V4 |
489 | [NFSD_Leasetime] = {"nfsv4leasetime", &transaction_ops, S_IWUSR|S_IRUSR}, | |
0964a3d3 | 490 | [NFSD_RecoveryDir] = {"nfsv4recoverydir", &transaction_ops, S_IWUSR|S_IRUSR}, |
1da177e4 LT |
491 | #endif |
492 | /* last one */ {""} | |
493 | }; | |
494 | return simple_fill_super(sb, 0x6e667364, nfsd_files); | |
495 | } | |
496 | ||
454e2398 DH |
497 | static int nfsd_get_sb(struct file_system_type *fs_type, |
498 | int flags, const char *dev_name, void *data, struct vfsmount *mnt) | |
1da177e4 | 499 | { |
454e2398 | 500 | return get_sb_single(fs_type, flags, data, nfsd_fill_super, mnt); |
1da177e4 LT |
501 | } |
502 | ||
503 | static struct file_system_type nfsd_fs_type = { | |
504 | .owner = THIS_MODULE, | |
505 | .name = "nfsd", | |
506 | .get_sb = nfsd_get_sb, | |
507 | .kill_sb = kill_litter_super, | |
508 | }; | |
509 | ||
510 | static int __init init_nfsd(void) | |
511 | { | |
512 | int retval; | |
513 | printk(KERN_INFO "Installing knfsd (copyright (C) 1996 okir@monad.swb.de).\n"); | |
514 | ||
515 | nfsd_stat_init(); /* Statistics */ | |
516 | nfsd_cache_init(); /* RPC reply cache */ | |
517 | nfsd_export_init(); /* Exports table */ | |
518 | nfsd_lockd_init(); /* lockd->nfsd callbacks */ | |
ac4d8ff2 | 519 | nfs4_state_init(); /* NFSv4 locking state */ |
1da177e4 | 520 | nfsd_idmap_init(); /* Name to ID mapping */ |
1da177e4 LT |
521 | if (proc_mkdir("fs/nfs", NULL)) { |
522 | struct proc_dir_entry *entry; | |
523 | entry = create_proc_entry("fs/nfs/exports", 0, NULL); | |
524 | if (entry) | |
525 | entry->proc_fops = &exports_operations; | |
526 | } | |
527 | retval = register_filesystem(&nfsd_fs_type); | |
528 | if (retval) { | |
529 | nfsd_export_shutdown(); | |
530 | nfsd_cache_shutdown(); | |
531 | remove_proc_entry("fs/nfs/exports", NULL); | |
532 | remove_proc_entry("fs/nfs", NULL); | |
533 | nfsd_stat_shutdown(); | |
534 | nfsd_lockd_shutdown(); | |
535 | } | |
536 | return retval; | |
537 | } | |
538 | ||
539 | static void __exit exit_nfsd(void) | |
540 | { | |
541 | nfsd_export_shutdown(); | |
542 | nfsd_cache_shutdown(); | |
543 | remove_proc_entry("fs/nfs/exports", NULL); | |
544 | remove_proc_entry("fs/nfs", NULL); | |
545 | nfsd_stat_shutdown(); | |
546 | nfsd_lockd_shutdown(); | |
1da177e4 | 547 | nfsd_idmap_shutdown(); |
1da177e4 LT |
548 | unregister_filesystem(&nfsd_fs_type); |
549 | } | |
550 | ||
551 | MODULE_AUTHOR("Olaf Kirch <okir@monad.swb.de>"); | |
552 | MODULE_LICENSE("GPL"); | |
553 | module_init(init_nfsd) | |
554 | module_exit(exit_nfsd) |