blob: 4a85b40eef4fea0d9f74b552695b6ecabca6a547 [file] [log] [blame]
Linus Torvalds1da177e2005-04-16 15:20:36 -07001#define MSNFS /* HACK HACK */
2/*
3 * linux/fs/nfsd/export.c
4 *
5 * NFS exporting and validation.
6 *
7 * We maintain a list of clients, each of which has a list of
8 * exports. To export an fs to a given client, you first have
9 * to create the client entry with NFSCTL_ADDCLIENT, which
10 * creates a client control block and adds it to the hash
11 * table. Then, you call NFSCTL_EXPORT for each fs.
12 *
13 *
14 * Copyright (C) 1995, 1996 Olaf Kirch, <okir@monad.swb.de>
15 */
16
17#include <linux/unistd.h>
18#include <linux/slab.h>
Linus Torvalds1da177e2005-04-16 15:20:36 -070019#include <linux/stat.h>
20#include <linux/in.h>
21#include <linux/seq_file.h>
22#include <linux/syscalls.h>
23#include <linux/rwsem.h>
24#include <linux/dcache.h>
25#include <linux/namei.h>
26#include <linux/mount.h>
27#include <linux/hash.h>
Bruce Allanf35279d2005-09-06 15:17:08 -070028#include <linux/module.h>
Christoph Hellwiga5694252007-07-17 04:04:28 -070029#include <linux/exportfs.h>
Linus Torvalds1da177e2005-04-16 15:20:36 -070030
31#include <linux/sunrpc/svc.h>
32#include <linux/nfsd/nfsd.h>
33#include <linux/nfsd/nfsfh.h>
34#include <linux/nfsd/syscall.h>
35#include <linux/lockd/bind.h>
Andy Adamsone677bfe2007-07-17 04:04:42 -070036#include <linux/sunrpc/msg_prot.h>
37#include <linux/sunrpc/gss_api.h>
Linus Torvalds1da177e2005-04-16 15:20:36 -070038
39#define NFSDDBG_FACILITY NFSDDBG_EXPORT
Linus Torvalds1da177e2005-04-16 15:20:36 -070040
41typedef struct auth_domain svc_client;
42typedef struct svc_export svc_export;
43
44static void exp_do_unexport(svc_export *unexp);
45static int exp_verify_string(char *cp, int max);
46
47/*
48 * We have two caches.
49 * One maps client+vfsmnt+dentry to export options - the export map
50 * The other maps client+filehandle-fragment to export options. - the expkey map
51 *
52 * The export options are actually stored in the first map, and the
53 * second map contains a reference to the entry in the first map.
54 */
55
56#define EXPKEY_HASHBITS 8
57#define EXPKEY_HASHMAX (1 << EXPKEY_HASHBITS)
58#define EXPKEY_HASHMASK (EXPKEY_HASHMAX -1)
59static struct cache_head *expkey_table[EXPKEY_HASHMAX];
60
Adrian Bunk74cae612006-03-27 01:15:10 -080061static void expkey_put(struct kref *ref)
Linus Torvalds1da177e2005-04-16 15:20:36 -070062{
NeilBrownbaab9352006-03-27 01:15:09 -080063 struct svc_expkey *key = container_of(ref, struct svc_expkey, h.ref);
64
65 if (test_bit(CACHE_VALID, &key->h.flags) &&
Jan Bluncke83aece2008-02-14 19:38:41 -080066 !test_bit(CACHE_NEGATIVE, &key->h.flags))
67 path_put(&key->ek_path);
NeilBrownbaab9352006-03-27 01:15:09 -080068 auth_domain_put(key->ek_client);
69 kfree(key);
Linus Torvalds1da177e2005-04-16 15:20:36 -070070}
71
72static void expkey_request(struct cache_detail *cd,
73 struct cache_head *h,
74 char **bpp, int *blen)
75{
76 /* client fsidtype \xfsid */
77 struct svc_expkey *ek = container_of(h, struct svc_expkey, h);
78 char type[5];
79
80 qword_add(bpp, blen, ek->ek_client->name);
81 snprintf(type, 5, "%d", ek->ek_fsidtype);
82 qword_add(bpp, blen, type);
83 qword_addhex(bpp, blen, (char*)ek->ek_fsid, key_len(ek->ek_fsidtype));
84 (*bpp)[-1] = '\n';
85}
86
NeilBrown8d270f7f2006-03-27 01:15:04 -080087static struct svc_expkey *svc_expkey_update(struct svc_expkey *new, struct svc_expkey *old);
88static struct svc_expkey *svc_expkey_lookup(struct svc_expkey *);
Adrian Bunk74cae612006-03-27 01:15:10 -080089static struct cache_detail svc_expkey_cache;
90
Linus Torvalds1da177e2005-04-16 15:20:36 -070091static int expkey_parse(struct cache_detail *cd, char *mesg, int mlen)
92{
93 /* client fsidtype fsid [path] */
94 char *buf;
95 int len;
96 struct auth_domain *dom = NULL;
97 int err;
98 int fsidtype;
99 char *ep;
100 struct svc_expkey key;
NeilBrown8d270f7f2006-03-27 01:15:04 -0800101 struct svc_expkey *ek;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700102
103 if (mesg[mlen-1] != '\n')
104 return -EINVAL;
105 mesg[mlen-1] = 0;
106
107 buf = kmalloc(PAGE_SIZE, GFP_KERNEL);
108 err = -ENOMEM;
109 if (!buf) goto out;
110
111 err = -EINVAL;
112 if ((len=qword_get(&mesg, buf, PAGE_SIZE)) <= 0)
113 goto out;
114
115 err = -ENOENT;
116 dom = auth_domain_find(buf);
117 if (!dom)
118 goto out;
119 dprintk("found domain %s\n", buf);
120
121 err = -EINVAL;
122 if ((len=qword_get(&mesg, buf, PAGE_SIZE)) <= 0)
123 goto out;
124 fsidtype = simple_strtoul(buf, &ep, 10);
125 if (*ep)
126 goto out;
127 dprintk("found fsidtype %d\n", fsidtype);
Frank Filz4bdff8c2006-06-30 01:56:11 -0700128 if (key_len(fsidtype)==0) /* invalid type */
Linus Torvalds1da177e2005-04-16 15:20:36 -0700129 goto out;
130 if ((len=qword_get(&mesg, buf, PAGE_SIZE)) <= 0)
131 goto out;
132 dprintk("found fsid length %d\n", len);
133 if (len != key_len(fsidtype))
134 goto out;
135
136 /* OK, we seem to have a valid key */
137 key.h.flags = 0;
138 key.h.expiry_time = get_expiry(&mesg);
139 if (key.h.expiry_time == 0)
140 goto out;
141
142 key.ek_client = dom;
143 key.ek_fsidtype = fsidtype;
144 memcpy(key.ek_fsid, buf, len);
145
NeilBrown8d270f7f2006-03-27 01:15:04 -0800146 ek = svc_expkey_lookup(&key);
147 err = -ENOMEM;
148 if (!ek)
149 goto out;
150
Linus Torvalds1da177e2005-04-16 15:20:36 -0700151 /* now we want a pathname, or empty meaning NEGATIVE */
NeilBrown8d270f7f2006-03-27 01:15:04 -0800152 err = -EINVAL;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700153 if ((len=qword_get(&mesg, buf, PAGE_SIZE)) < 0)
154 goto out;
155 dprintk("Path seems to be <%s>\n", buf);
156 err = 0;
157 if (len == 0) {
Linus Torvalds1da177e2005-04-16 15:20:36 -0700158 set_bit(CACHE_NEGATIVE, &key.h.flags);
NeilBrown8d270f7f2006-03-27 01:15:04 -0800159 ek = svc_expkey_update(&key, ek);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700160 if (ek)
NeilBrownbaab9352006-03-27 01:15:09 -0800161 cache_put(&ek->h, &svc_expkey_cache);
NeilBrown8d270f7f2006-03-27 01:15:04 -0800162 else err = -ENOMEM;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700163 } else {
164 struct nameidata nd;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700165 err = path_lookup(buf, 0, &nd);
166 if (err)
167 goto out;
168
169 dprintk("Found the path %s\n", buf);
Jan Bluncke83aece2008-02-14 19:38:41 -0800170 key.ek_path = nd.path;
171
NeilBrown8d270f7f2006-03-27 01:15:04 -0800172 ek = svc_expkey_update(&key, ek);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700173 if (ek)
NeilBrownbaab9352006-03-27 01:15:09 -0800174 cache_put(&ek->h, &svc_expkey_cache);
NeilBrown8d270f7f2006-03-27 01:15:04 -0800175 else
176 err = -ENOMEM;
Jan Blunck1d957f92008-02-14 19:34:35 -0800177 path_put(&nd.path);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700178 }
179 cache_flush();
180 out:
181 if (dom)
182 auth_domain_put(dom);
Jesper Juhlf99d49a2005-11-07 01:01:34 -0800183 kfree(buf);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700184 return err;
185}
186
187static int expkey_show(struct seq_file *m,
188 struct cache_detail *cd,
189 struct cache_head *h)
190{
191 struct svc_expkey *ek ;
NeilBrownaf6a4e22007-02-14 00:33:12 -0800192 int i;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700193
194 if (h ==NULL) {
195 seq_puts(m, "#domain fsidtype fsid [path]\n");
196 return 0;
197 }
198 ek = container_of(h, struct svc_expkey, h);
NeilBrownaf6a4e22007-02-14 00:33:12 -0800199 seq_printf(m, "%s %d 0x", ek->ek_client->name,
200 ek->ek_fsidtype);
201 for (i=0; i < key_len(ek->ek_fsidtype)/4; i++)
202 seq_printf(m, "%08x", ek->ek_fsid[i]);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700203 if (test_bit(CACHE_VALID, &h->flags) &&
204 !test_bit(CACHE_NEGATIVE, &h->flags)) {
205 seq_printf(m, " ");
Jan Blunckc32c2f62008-02-14 19:38:43 -0800206 seq_path(m, &ek->ek_path, "\\ \t\n");
Linus Torvalds1da177e2005-04-16 15:20:36 -0700207 }
208 seq_printf(m, "\n");
209 return 0;
210}
NeilBrown8d270f7f2006-03-27 01:15:04 -0800211
212static inline int expkey_match (struct cache_head *a, struct cache_head *b)
213{
214 struct svc_expkey *orig = container_of(a, struct svc_expkey, h);
215 struct svc_expkey *new = container_of(b, struct svc_expkey, h);
216
217 if (orig->ek_fsidtype != new->ek_fsidtype ||
218 orig->ek_client != new->ek_client ||
219 memcmp(orig->ek_fsid, new->ek_fsid, key_len(orig->ek_fsidtype)) != 0)
220 return 0;
221 return 1;
222}
223
224static inline void expkey_init(struct cache_head *cnew,
225 struct cache_head *citem)
226{
227 struct svc_expkey *new = container_of(cnew, struct svc_expkey, h);
228 struct svc_expkey *item = container_of(citem, struct svc_expkey, h);
229
230 kref_get(&item->ek_client->ref);
231 new->ek_client = item->ek_client;
232 new->ek_fsidtype = item->ek_fsidtype;
NeilBrownaf6a4e22007-02-14 00:33:12 -0800233
234 memcpy(new->ek_fsid, item->ek_fsid, sizeof(new->ek_fsid));
NeilBrown8d270f7f2006-03-27 01:15:04 -0800235}
236
237static inline void expkey_update(struct cache_head *cnew,
238 struct cache_head *citem)
239{
240 struct svc_expkey *new = container_of(cnew, struct svc_expkey, h);
241 struct svc_expkey *item = container_of(citem, struct svc_expkey, h);
242
Jan Bluncke83aece2008-02-14 19:38:41 -0800243 new->ek_path = item->ek_path;
244 path_get(&item->ek_path);
NeilBrown8d270f7f2006-03-27 01:15:04 -0800245}
246
247static struct cache_head *expkey_alloc(void)
248{
249 struct svc_expkey *i = kmalloc(sizeof(*i), GFP_KERNEL);
250 if (i)
251 return &i->h;
252 else
253 return NULL;
254}
255
Adrian Bunk74cae612006-03-27 01:15:10 -0800256static struct cache_detail svc_expkey_cache = {
Bruce Allanf35279d2005-09-06 15:17:08 -0700257 .owner = THIS_MODULE,
Linus Torvalds1da177e2005-04-16 15:20:36 -0700258 .hash_size = EXPKEY_HASHMAX,
259 .hash_table = expkey_table,
260 .name = "nfsd.fh",
261 .cache_put = expkey_put,
262 .cache_request = expkey_request,
263 .cache_parse = expkey_parse,
264 .cache_show = expkey_show,
NeilBrown8d270f7f2006-03-27 01:15:04 -0800265 .match = expkey_match,
266 .init = expkey_init,
267 .update = expkey_update,
268 .alloc = expkey_alloc,
Linus Torvalds1da177e2005-04-16 15:20:36 -0700269};
270
NeilBrown8d270f7f2006-03-27 01:15:04 -0800271static struct svc_expkey *
272svc_expkey_lookup(struct svc_expkey *item)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700273{
NeilBrown8d270f7f2006-03-27 01:15:04 -0800274 struct cache_head *ch;
275 int hash = item->ek_fsidtype;
276 char * cp = (char*)item->ek_fsid;
277 int len = key_len(item->ek_fsidtype);
278
279 hash ^= hash_mem(cp, len, EXPKEY_HASHBITS);
280 hash ^= hash_ptr(item->ek_client, EXPKEY_HASHBITS);
281 hash &= EXPKEY_HASHMASK;
282
283 ch = sunrpc_cache_lookup(&svc_expkey_cache, &item->h,
284 hash);
285 if (ch)
286 return container_of(ch, struct svc_expkey, h);
287 else
288 return NULL;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700289}
290
NeilBrown8d270f7f2006-03-27 01:15:04 -0800291static struct svc_expkey *
292svc_expkey_update(struct svc_expkey *new, struct svc_expkey *old)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700293{
NeilBrown8d270f7f2006-03-27 01:15:04 -0800294 struct cache_head *ch;
295 int hash = new->ek_fsidtype;
296 char * cp = (char*)new->ek_fsid;
297 int len = key_len(new->ek_fsidtype);
298
299 hash ^= hash_mem(cp, len, EXPKEY_HASHBITS);
300 hash ^= hash_ptr(new->ek_client, EXPKEY_HASHBITS);
301 hash &= EXPKEY_HASHMASK;
302
303 ch = sunrpc_cache_update(&svc_expkey_cache, &new->h,
304 &old->h, hash);
305 if (ch)
306 return container_of(ch, struct svc_expkey, h);
307 else
308 return NULL;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700309}
310
Linus Torvalds1da177e2005-04-16 15:20:36 -0700311
312#define EXPORT_HASHBITS 8
313#define EXPORT_HASHMAX (1<< EXPORT_HASHBITS)
314#define EXPORT_HASHMASK (EXPORT_HASHMAX -1)
315
316static struct cache_head *export_table[EXPORT_HASHMAX];
317
Manoj Naik933469192006-10-04 02:16:18 -0700318static void nfsd4_fslocs_free(struct nfsd4_fs_locations *fsloc)
319{
320 int i;
321
322 for (i = 0; i < fsloc->locations_count; i++) {
323 kfree(fsloc->locations[i].path);
324 kfree(fsloc->locations[i].hosts);
325 }
326 kfree(fsloc->locations);
327}
328
NeilBrownbaab9352006-03-27 01:15:09 -0800329static void svc_export_put(struct kref *ref)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700330{
NeilBrownbaab9352006-03-27 01:15:09 -0800331 struct svc_export *exp = container_of(ref, struct svc_export, h.ref);
Jan Blunck54775492008-02-14 19:38:39 -0800332 path_put(&exp->ex_path);
NeilBrownbaab9352006-03-27 01:15:09 -0800333 auth_domain_put(exp->ex_client);
Jan Blunck54775492008-02-14 19:38:39 -0800334 kfree(exp->ex_pathname);
Manoj Naik933469192006-10-04 02:16:18 -0700335 nfsd4_fslocs_free(&exp->ex_fslocs);
NeilBrownbaab9352006-03-27 01:15:09 -0800336 kfree(exp);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700337}
338
339static void svc_export_request(struct cache_detail *cd,
340 struct cache_head *h,
341 char **bpp, int *blen)
342{
343 /* client path */
344 struct svc_export *exp = container_of(h, struct svc_export, h);
345 char *pth;
346
347 qword_add(bpp, blen, exp->ex_client->name);
Jan Blunck54775492008-02-14 19:38:39 -0800348 pth = d_path(exp->ex_path.dentry, exp->ex_path.mnt, *bpp, *blen);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700349 if (IS_ERR(pth)) {
350 /* is this correct? */
351 (*bpp)[0] = '\n';
352 return;
353 }
354 qword_add(bpp, blen, pth);
355 (*bpp)[-1] = '\n';
356}
357
Adrian Bunk74cae612006-03-27 01:15:10 -0800358static struct svc_export *svc_export_update(struct svc_export *new,
359 struct svc_export *old);
NeilBrown4f7774c2006-03-27 01:15:03 -0800360static struct svc_export *svc_export_lookup(struct svc_export *);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700361
NeilBrownaf6a4e22007-02-14 00:33:12 -0800362static int check_export(struct inode *inode, int flags, unsigned char *uuid)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700363{
364
365 /* We currently export only dirs and regular files.
366 * This is what umountd does.
367 */
368 if (!S_ISDIR(inode->i_mode) &&
369 !S_ISREG(inode->i_mode))
370 return -ENOTDIR;
371
372 /* There are two requirements on a filesystem to be exportable.
373 * 1: We must be able to identify the filesystem from a number.
374 * either a device number (so FS_REQUIRES_DEV needed)
NeilBrownaf6a4e22007-02-14 00:33:12 -0800375 * or an FSID number (so NFSEXP_FSID or ->uuid is needed).
Linus Torvalds1da177e2005-04-16 15:20:36 -0700376 * 2: We must be able to find an inode from a filehandle.
377 * This means that s_export_op must be set.
378 */
379 if (!(inode->i_sb->s_type->fs_flags & FS_REQUIRES_DEV) &&
NeilBrownaf6a4e22007-02-14 00:33:12 -0800380 !(flags & NFSEXP_FSID) &&
381 uuid == NULL) {
Greg Banks3e3b4802006-10-02 02:17:41 -0700382 dprintk("exp_export: export of non-dev fs without fsid\n");
Linus Torvalds1da177e2005-04-16 15:20:36 -0700383 return -EINVAL;
384 }
Christoph Hellwigcfaea782007-10-21 16:42:16 -0700385
386 if (!inode->i_sb->s_export_op ||
387 !inode->i_sb->s_export_op->fh_to_dentry) {
Linus Torvalds1da177e2005-04-16 15:20:36 -0700388 dprintk("exp_export: export of invalid fs type.\n");
389 return -EINVAL;
390 }
391
Linus Torvalds1da177e2005-04-16 15:20:36 -0700392 return 0;
393
394}
395
Manoj Naik933469192006-10-04 02:16:18 -0700396#ifdef CONFIG_NFSD_V4
397
398static int
399fsloc_parse(char **mesg, char *buf, struct nfsd4_fs_locations *fsloc)
400{
401 int len;
402 int migrated, i, err;
403
Manoj Naik933469192006-10-04 02:16:18 -0700404 /* listsize */
405 err = get_int(mesg, &fsloc->locations_count);
406 if (err)
407 return err;
408 if (fsloc->locations_count > MAX_FS_LOCATIONS)
409 return -EINVAL;
410 if (fsloc->locations_count == 0)
411 return 0;
412
413 fsloc->locations = kzalloc(fsloc->locations_count
414 * sizeof(struct nfsd4_fs_location), GFP_KERNEL);
415 if (!fsloc->locations)
416 return -ENOMEM;
417 for (i=0; i < fsloc->locations_count; i++) {
418 /* colon separated host list */
419 err = -EINVAL;
420 len = qword_get(mesg, buf, PAGE_SIZE);
421 if (len <= 0)
422 goto out_free_all;
423 err = -ENOMEM;
424 fsloc->locations[i].hosts = kstrdup(buf, GFP_KERNEL);
425 if (!fsloc->locations[i].hosts)
426 goto out_free_all;
427 err = -EINVAL;
428 /* slash separated path component list */
429 len = qword_get(mesg, buf, PAGE_SIZE);
430 if (len <= 0)
431 goto out_free_all;
432 err = -ENOMEM;
433 fsloc->locations[i].path = kstrdup(buf, GFP_KERNEL);
434 if (!fsloc->locations[i].path)
435 goto out_free_all;
436 }
437 /* migrated */
438 err = get_int(mesg, &migrated);
439 if (err)
440 goto out_free_all;
441 err = -EINVAL;
442 if (migrated < 0 || migrated > 1)
443 goto out_free_all;
444 fsloc->migrated = migrated;
445 return 0;
446out_free_all:
447 nfsd4_fslocs_free(fsloc);
448 return err;
449}
450
Andy Adamsone677bfe2007-07-17 04:04:42 -0700451static int secinfo_parse(char **mesg, char *buf, struct svc_export *exp)
452{
453 int listsize, err;
454 struct exp_flavor_info *f;
455
456 err = get_int(mesg, &listsize);
457 if (err)
458 return err;
459 if (listsize < 0 || listsize > MAX_SECINFO_LIST)
460 return -EINVAL;
461
462 for (f = exp->ex_flavors; f < exp->ex_flavors + listsize; f++) {
463 err = get_int(mesg, &f->pseudoflavor);
464 if (err)
465 return err;
466 /*
467 * Just a quick sanity check; we could also try to check
468 * whether this pseudoflavor is supported, but at worst
469 * an unsupported pseudoflavor on the export would just
470 * be a pseudoflavor that won't match the flavor of any
471 * authenticated request. The administrator will
472 * probably discover the problem when someone fails to
473 * authenticate.
474 */
475 if (f->pseudoflavor < 0)
476 return -EINVAL;
477 err = get_int(mesg, &f->flags);
478 if (err)
479 return err;
480 /* Only some flags are allowed to differ between flavors: */
481 if (~NFSEXP_SECINFO_FLAGS & (f->flags ^ exp->ex_flags))
482 return -EINVAL;
483 }
484 exp->ex_nflavors = listsize;
485 return 0;
486}
487
Manoj Naik933469192006-10-04 02:16:18 -0700488#else /* CONFIG_NFSD_V4 */
Andy Adamsone677bfe2007-07-17 04:04:42 -0700489static inline int
490fsloc_parse(char **mesg, char *buf, struct nfsd4_fs_locations *fsloc){return 0;}
491static inline int
492secinfo_parse(char **mesg, char *buf, struct svc_export *exp) { return 0; }
Manoj Naik933469192006-10-04 02:16:18 -0700493#endif
494
Linus Torvalds1da177e2005-04-16 15:20:36 -0700495static int svc_export_parse(struct cache_detail *cd, char *mesg, int mlen)
496{
497 /* client path expiry [flags anonuid anongid fsid] */
498 char *buf;
499 int len;
500 int err;
501 struct auth_domain *dom = NULL;
502 struct nameidata nd;
503 struct svc_export exp, *expp;
504 int an_int;
505
Jan Blunck4ac91372008-02-14 19:34:32 -0800506 nd.path.dentry = NULL;
Jan Blunck54775492008-02-14 19:38:39 -0800507 exp.ex_pathname = NULL;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700508
NeilBrown402acd22007-05-09 02:34:52 -0700509 /* fs locations */
510 exp.ex_fslocs.locations = NULL;
511 exp.ex_fslocs.locations_count = 0;
512 exp.ex_fslocs.migrated = 0;
513
514 exp.ex_uuid = NULL;
515
Andy Adamsone677bfe2007-07-17 04:04:42 -0700516 /* secinfo */
517 exp.ex_nflavors = 0;
518
Linus Torvalds1da177e2005-04-16 15:20:36 -0700519 if (mesg[mlen-1] != '\n')
520 return -EINVAL;
521 mesg[mlen-1] = 0;
522
523 buf = kmalloc(PAGE_SIZE, GFP_KERNEL);
524 err = -ENOMEM;
525 if (!buf) goto out;
526
527 /* client */
528 len = qword_get(&mesg, buf, PAGE_SIZE);
529 err = -EINVAL;
530 if (len <= 0) goto out;
531
532 err = -ENOENT;
533 dom = auth_domain_find(buf);
534 if (!dom)
535 goto out;
536
537 /* path */
538 err = -EINVAL;
539 if ((len=qword_get(&mesg, buf, PAGE_SIZE)) <= 0)
540 goto out;
541 err = path_lookup(buf, 0, &nd);
NeilBrowncd156542006-04-10 22:55:27 -0700542 if (err) goto out_no_path;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700543
544 exp.h.flags = 0;
545 exp.ex_client = dom;
Jan Blunck54775492008-02-14 19:38:39 -0800546 exp.ex_path.mnt = nd.path.mnt;
547 exp.ex_path.dentry = nd.path.dentry;
548 exp.ex_pathname = kstrdup(buf, GFP_KERNEL);
J.Bruce Fieldsb009a872006-10-04 02:16:17 -0700549 err = -ENOMEM;
Jan Blunck54775492008-02-14 19:38:39 -0800550 if (!exp.ex_pathname)
J.Bruce Fieldsb009a872006-10-04 02:16:17 -0700551 goto out;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700552
553 /* expiry */
554 err = -EINVAL;
555 exp.h.expiry_time = get_expiry(&mesg);
556 if (exp.h.expiry_time == 0)
557 goto out;
558
559 /* flags */
560 err = get_int(&mesg, &an_int);
J. Bruce Fields4a4b8832007-07-31 00:37:53 -0700561 if (err == -ENOENT) {
562 err = 0;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700563 set_bit(CACHE_NEGATIVE, &exp.h.flags);
J. Bruce Fields4a4b8832007-07-31 00:37:53 -0700564 } else {
Linus Torvalds1da177e2005-04-16 15:20:36 -0700565 if (err || an_int < 0) goto out;
566 exp.ex_flags= an_int;
567
568 /* anon uid */
569 err = get_int(&mesg, &an_int);
570 if (err) goto out;
571 exp.ex_anon_uid= an_int;
572
573 /* anon gid */
574 err = get_int(&mesg, &an_int);
575 if (err) goto out;
576 exp.ex_anon_gid= an_int;
577
578 /* fsid */
579 err = get_int(&mesg, &an_int);
580 if (err) goto out;
581 exp.ex_fsid = an_int;
582
NeilBrownaf6a4e22007-02-14 00:33:12 -0800583 while ((len = qword_get(&mesg, buf, PAGE_SIZE)) > 0) {
584 if (strcmp(buf, "fsloc") == 0)
585 err = fsloc_parse(&mesg, buf, &exp.ex_fslocs);
586 else if (strcmp(buf, "uuid") == 0) {
587 /* expect a 16 byte uuid encoded as \xXXXX... */
588 len = qword_get(&mesg, buf, PAGE_SIZE);
589 if (len != 16)
590 err = -EINVAL;
591 else {
592 exp.ex_uuid =
593 kmemdup(buf, 16, GFP_KERNEL);
594 if (exp.ex_uuid == NULL)
595 err = -ENOMEM;
596 }
Andy Adamsone677bfe2007-07-17 04:04:42 -0700597 } else if (strcmp(buf, "secinfo") == 0)
598 err = secinfo_parse(&mesg, buf, &exp);
599 else
NeilBrownaf6a4e22007-02-14 00:33:12 -0800600 /* quietly ignore unknown words and anything
601 * following. Newer user-space can try to set
602 * new values, then see what the result was.
603 */
604 break;
605 if (err)
606 goto out;
607 }
Manoj Naik933469192006-10-04 02:16:18 -0700608
Jan Blunck4ac91372008-02-14 19:34:32 -0800609 err = check_export(nd.path.dentry->d_inode, exp.ex_flags,
NeilBrownaf6a4e22007-02-14 00:33:12 -0800610 exp.ex_uuid);
611 if (err) goto out;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700612 }
613
NeilBrown4f7774c2006-03-27 01:15:03 -0800614 expp = svc_export_lookup(&exp);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700615 if (expp)
NeilBrown4f7774c2006-03-27 01:15:03 -0800616 expp = svc_export_update(&exp, expp);
617 else
618 err = -ENOMEM;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700619 cache_flush();
NeilBrown4f7774c2006-03-27 01:15:03 -0800620 if (expp == NULL)
621 err = -ENOMEM;
622 else
623 exp_put(expp);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700624 out:
NeilBrownaf6a4e22007-02-14 00:33:12 -0800625 nfsd4_fslocs_free(&exp.ex_fslocs);
626 kfree(exp.ex_uuid);
Jan Blunck54775492008-02-14 19:38:39 -0800627 kfree(exp.ex_pathname);
Jan Blunck4ac91372008-02-14 19:34:32 -0800628 if (nd.path.dentry)
Jan Blunck1d957f92008-02-14 19:34:35 -0800629 path_put(&nd.path);
NeilBrowncd156542006-04-10 22:55:27 -0700630 out_no_path:
Linus Torvalds1da177e2005-04-16 15:20:36 -0700631 if (dom)
632 auth_domain_put(dom);
Jesper Juhlf99d49a2005-11-07 01:01:34 -0800633 kfree(buf);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700634 return err;
635}
636
Manoj Naik933469192006-10-04 02:16:18 -0700637static void exp_flags(struct seq_file *m, int flag, int fsid,
638 uid_t anonu, uid_t anong, struct nfsd4_fs_locations *fslocs);
J. Bruce Fields91fe39d2007-07-17 04:04:49 -0700639static void show_secinfo(struct seq_file *m, struct svc_export *exp);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700640
641static int svc_export_show(struct seq_file *m,
642 struct cache_detail *cd,
643 struct cache_head *h)
644{
645 struct svc_export *exp ;
646
647 if (h ==NULL) {
648 seq_puts(m, "#path domain(flags)\n");
649 return 0;
650 }
651 exp = container_of(h, struct svc_export, h);
Jan Blunckc32c2f62008-02-14 19:38:43 -0800652 seq_path(m, &exp->ex_path, " \t\n\\");
Linus Torvalds1da177e2005-04-16 15:20:36 -0700653 seq_putc(m, '\t');
654 seq_escape(m, exp->ex_client->name, " \t\n\\");
655 seq_putc(m, '(');
656 if (test_bit(CACHE_VALID, &h->flags) &&
NeilBrownaf6a4e22007-02-14 00:33:12 -0800657 !test_bit(CACHE_NEGATIVE, &h->flags)) {
Manoj Naik933469192006-10-04 02:16:18 -0700658 exp_flags(m, exp->ex_flags, exp->ex_fsid,
659 exp->ex_anon_uid, exp->ex_anon_gid, &exp->ex_fslocs);
NeilBrownaf6a4e22007-02-14 00:33:12 -0800660 if (exp->ex_uuid) {
661 int i;
662 seq_puts(m, ",uuid=");
663 for (i=0; i<16; i++) {
664 if ((i&3) == 0 && i)
665 seq_putc(m, ':');
666 seq_printf(m, "%02x", exp->ex_uuid[i]);
667 }
668 }
J. Bruce Fields91fe39d2007-07-17 04:04:49 -0700669 show_secinfo(m, exp);
NeilBrownaf6a4e22007-02-14 00:33:12 -0800670 }
Linus Torvalds1da177e2005-04-16 15:20:36 -0700671 seq_puts(m, ")\n");
672 return 0;
673}
NeilBrown4f7774c2006-03-27 01:15:03 -0800674static int svc_export_match(struct cache_head *a, struct cache_head *b)
675{
676 struct svc_export *orig = container_of(a, struct svc_export, h);
677 struct svc_export *new = container_of(b, struct svc_export, h);
678 return orig->ex_client == new->ex_client &&
Jan Blunck54775492008-02-14 19:38:39 -0800679 orig->ex_path.dentry == new->ex_path.dentry &&
680 orig->ex_path.mnt == new->ex_path.mnt;
NeilBrown4f7774c2006-03-27 01:15:03 -0800681}
682
683static void svc_export_init(struct cache_head *cnew, struct cache_head *citem)
684{
685 struct svc_export *new = container_of(cnew, struct svc_export, h);
686 struct svc_export *item = container_of(citem, struct svc_export, h);
687
688 kref_get(&item->ex_client->ref);
689 new->ex_client = item->ex_client;
Jan Blunck54775492008-02-14 19:38:39 -0800690 new->ex_path.dentry = dget(item->ex_path.dentry);
691 new->ex_path.mnt = mntget(item->ex_path.mnt);
692 new->ex_pathname = NULL;
Manoj Naik933469192006-10-04 02:16:18 -0700693 new->ex_fslocs.locations = NULL;
694 new->ex_fslocs.locations_count = 0;
695 new->ex_fslocs.migrated = 0;
NeilBrown4f7774c2006-03-27 01:15:03 -0800696}
697
698static void export_update(struct cache_head *cnew, struct cache_head *citem)
699{
700 struct svc_export *new = container_of(cnew, struct svc_export, h);
701 struct svc_export *item = container_of(citem, struct svc_export, h);
Andy Adamsone677bfe2007-07-17 04:04:42 -0700702 int i;
NeilBrown4f7774c2006-03-27 01:15:03 -0800703
704 new->ex_flags = item->ex_flags;
705 new->ex_anon_uid = item->ex_anon_uid;
706 new->ex_anon_gid = item->ex_anon_gid;
707 new->ex_fsid = item->ex_fsid;
NeilBrownaf6a4e22007-02-14 00:33:12 -0800708 new->ex_uuid = item->ex_uuid;
709 item->ex_uuid = NULL;
Jan Blunck54775492008-02-14 19:38:39 -0800710 new->ex_pathname = item->ex_pathname;
711 item->ex_pathname = NULL;
Manoj Naik933469192006-10-04 02:16:18 -0700712 new->ex_fslocs.locations = item->ex_fslocs.locations;
713 item->ex_fslocs.locations = NULL;
714 new->ex_fslocs.locations_count = item->ex_fslocs.locations_count;
715 item->ex_fslocs.locations_count = 0;
716 new->ex_fslocs.migrated = item->ex_fslocs.migrated;
717 item->ex_fslocs.migrated = 0;
Andy Adamsone677bfe2007-07-17 04:04:42 -0700718 new->ex_nflavors = item->ex_nflavors;
719 for (i = 0; i < MAX_SECINFO_LIST; i++) {
720 new->ex_flavors[i] = item->ex_flavors[i];
721 }
NeilBrown4f7774c2006-03-27 01:15:03 -0800722}
723
724static struct cache_head *svc_export_alloc(void)
725{
726 struct svc_export *i = kmalloc(sizeof(*i), GFP_KERNEL);
727 if (i)
728 return &i->h;
729 else
730 return NULL;
731}
732
Linus Torvalds1da177e2005-04-16 15:20:36 -0700733struct cache_detail svc_export_cache = {
Bruce Allanf35279d2005-09-06 15:17:08 -0700734 .owner = THIS_MODULE,
Linus Torvalds1da177e2005-04-16 15:20:36 -0700735 .hash_size = EXPORT_HASHMAX,
736 .hash_table = export_table,
737 .name = "nfsd.export",
738 .cache_put = svc_export_put,
739 .cache_request = svc_export_request,
740 .cache_parse = svc_export_parse,
741 .cache_show = svc_export_show,
NeilBrown4f7774c2006-03-27 01:15:03 -0800742 .match = svc_export_match,
743 .init = svc_export_init,
744 .update = export_update,
745 .alloc = svc_export_alloc,
Linus Torvalds1da177e2005-04-16 15:20:36 -0700746};
747
NeilBrown4f7774c2006-03-27 01:15:03 -0800748static struct svc_export *
749svc_export_lookup(struct svc_export *exp)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700750{
NeilBrown4f7774c2006-03-27 01:15:03 -0800751 struct cache_head *ch;
752 int hash;
753 hash = hash_ptr(exp->ex_client, EXPORT_HASHBITS);
Jan Blunck54775492008-02-14 19:38:39 -0800754 hash ^= hash_ptr(exp->ex_path.dentry, EXPORT_HASHBITS);
755 hash ^= hash_ptr(exp->ex_path.mnt, EXPORT_HASHBITS);
NeilBrown4f7774c2006-03-27 01:15:03 -0800756
757 ch = sunrpc_cache_lookup(&svc_export_cache, &exp->h,
758 hash);
759 if (ch)
760 return container_of(ch, struct svc_export, h);
761 else
762 return NULL;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700763}
764
Adrian Bunk74cae612006-03-27 01:15:10 -0800765static struct svc_export *
NeilBrown4f7774c2006-03-27 01:15:03 -0800766svc_export_update(struct svc_export *new, struct svc_export *old)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700767{
NeilBrown4f7774c2006-03-27 01:15:03 -0800768 struct cache_head *ch;
769 int hash;
770 hash = hash_ptr(old->ex_client, EXPORT_HASHBITS);
Jan Blunck54775492008-02-14 19:38:39 -0800771 hash ^= hash_ptr(old->ex_path.dentry, EXPORT_HASHBITS);
772 hash ^= hash_ptr(old->ex_path.mnt, EXPORT_HASHBITS);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700773
NeilBrown4f7774c2006-03-27 01:15:03 -0800774 ch = sunrpc_cache_update(&svc_export_cache, &new->h,
775 &old->h,
776 hash);
777 if (ch)
778 return container_of(ch, struct svc_export, h);
779 else
780 return NULL;
781}
Linus Torvalds1da177e2005-04-16 15:20:36 -0700782
783
Adrian Bunk74cae612006-03-27 01:15:10 -0800784static struct svc_expkey *
Linus Torvalds1da177e2005-04-16 15:20:36 -0700785exp_find_key(svc_client *clp, int fsid_type, u32 *fsidv, struct cache_req *reqp)
786{
787 struct svc_expkey key, *ek;
788 int err;
789
790 if (!clp)
J. Bruce Fields2d3bb252007-07-17 04:04:40 -0700791 return ERR_PTR(-ENOENT);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700792
793 key.ek_client = clp;
794 key.ek_fsidtype = fsid_type;
795 memcpy(key.ek_fsid, fsidv, key_len(fsid_type));
796
NeilBrown8d270f7f2006-03-27 01:15:04 -0800797 ek = svc_expkey_lookup(&key);
J. Bruce Fields2d3bb252007-07-17 04:04:40 -0700798 if (ek == NULL)
799 return ERR_PTR(-ENOMEM);
800 err = cache_check(&svc_expkey_cache, &ek->h, reqp);
801 if (err)
802 return ERR_PTR(err);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700803 return ek;
804}
805
806static int exp_set_key(svc_client *clp, int fsid_type, u32 *fsidv,
807 struct svc_export *exp)
808{
809 struct svc_expkey key, *ek;
810
811 key.ek_client = clp;
812 key.ek_fsidtype = fsid_type;
813 memcpy(key.ek_fsid, fsidv, key_len(fsid_type));
Jan Bluncke83aece2008-02-14 19:38:41 -0800814 key.ek_path = exp->ex_path;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700815 key.h.expiry_time = NEVER;
816 key.h.flags = 0;
817
NeilBrown8d270f7f2006-03-27 01:15:04 -0800818 ek = svc_expkey_lookup(&key);
819 if (ek)
820 ek = svc_expkey_update(&key,ek);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700821 if (ek) {
NeilBrownbaab9352006-03-27 01:15:09 -0800822 cache_put(&ek->h, &svc_expkey_cache);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700823 return 0;
824 }
825 return -ENOMEM;
826}
827
828/*
829 * Find the client's export entry matching xdev/xino.
830 */
831static inline struct svc_expkey *
832exp_get_key(svc_client *clp, dev_t dev, ino_t ino)
833{
834 u32 fsidv[3];
835
836 if (old_valid_dev(dev)) {
NeilBrownaf6a4e22007-02-14 00:33:12 -0800837 mk_fsid(FSID_DEV, fsidv, dev, ino, 0, NULL);
838 return exp_find_key(clp, FSID_DEV, fsidv, NULL);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700839 }
NeilBrownaf6a4e22007-02-14 00:33:12 -0800840 mk_fsid(FSID_ENCODE_DEV, fsidv, dev, ino, 0, NULL);
841 return exp_find_key(clp, FSID_ENCODE_DEV, fsidv, NULL);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700842}
843
844/*
845 * Find the client's export entry matching fsid
846 */
847static inline struct svc_expkey *
848exp_get_fsid_key(svc_client *clp, int fsid)
849{
850 u32 fsidv[2];
851
NeilBrownaf6a4e22007-02-14 00:33:12 -0800852 mk_fsid(FSID_NUM, fsidv, 0, 0, fsid, NULL);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700853
NeilBrownaf6a4e22007-02-14 00:33:12 -0800854 return exp_find_key(clp, FSID_NUM, fsidv, NULL);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700855}
856
Adrian Bunkcce76f92007-10-16 01:27:52 -0700857static svc_export *exp_get_by_name(svc_client *clp, struct vfsmount *mnt,
858 struct dentry *dentry,
859 struct cache_req *reqp)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700860{
861 struct svc_export *exp, key;
J. Bruce Fields2d3bb252007-07-17 04:04:40 -0700862 int err;
Jan Bluncke83aece2008-02-14 19:38:41 -0800863
Linus Torvalds1da177e2005-04-16 15:20:36 -0700864 if (!clp)
J. Bruce Fields2d3bb252007-07-17 04:04:40 -0700865 return ERR_PTR(-ENOENT);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700866
867 key.ex_client = clp;
Jan Blunck54775492008-02-14 19:38:39 -0800868 key.ex_path.mnt = mnt;
869 key.ex_path.dentry = dentry;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700870
NeilBrown4f7774c2006-03-27 01:15:03 -0800871 exp = svc_export_lookup(&key);
J. Bruce Fields2d3bb252007-07-17 04:04:40 -0700872 if (exp == NULL)
873 return ERR_PTR(-ENOMEM);
874 err = cache_check(&svc_export_cache, &exp->h, reqp);
875 if (err)
876 return ERR_PTR(err);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700877 return exp;
878}
879
880/*
881 * Find the export entry for a given dentry.
882 */
Adrian Bunkcce76f92007-10-16 01:27:52 -0700883static struct svc_export *exp_parent(svc_client *clp, struct vfsmount *mnt,
884 struct dentry *dentry,
885 struct cache_req *reqp)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700886{
887 svc_export *exp;
888
889 dget(dentry);
890 exp = exp_get_by_name(clp, mnt, dentry, reqp);
891
J. Bruce Fields2d3bb252007-07-17 04:04:40 -0700892 while (PTR_ERR(exp) == -ENOENT && !IS_ROOT(dentry)) {
Linus Torvalds1da177e2005-04-16 15:20:36 -0700893 struct dentry *parent;
894
895 parent = dget_parent(dentry);
896 dput(dentry);
897 dentry = parent;
898 exp = exp_get_by_name(clp, mnt, dentry, reqp);
899 }
900 dput(dentry);
901 return exp;
902}
903
904/*
905 * Hashtable locking. Write locks are placed only by user processes
906 * wanting to modify export information.
907 * Write locking only done in this file. Read locking
908 * needed externally.
909 */
910
911static DECLARE_RWSEM(hash_sem);
912
913void
914exp_readlock(void)
915{
916 down_read(&hash_sem);
917}
918
919static inline void
920exp_writelock(void)
921{
922 down_write(&hash_sem);
923}
924
925void
926exp_readunlock(void)
927{
928 up_read(&hash_sem);
929}
930
931static inline void
932exp_writeunlock(void)
933{
934 up_write(&hash_sem);
935}
936
937static void exp_fsid_unhash(struct svc_export *exp)
938{
939 struct svc_expkey *ek;
940
941 if ((exp->ex_flags & NFSEXP_FSID) == 0)
942 return;
943
944 ek = exp_get_fsid_key(exp->ex_client, exp->ex_fsid);
J. Bruce Fields2d3bb252007-07-17 04:04:40 -0700945 if (!IS_ERR(ek)) {
Linus Torvalds1da177e2005-04-16 15:20:36 -0700946 ek->h.expiry_time = get_seconds()-1;
NeilBrownbaab9352006-03-27 01:15:09 -0800947 cache_put(&ek->h, &svc_expkey_cache);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700948 }
949 svc_expkey_cache.nextcheck = get_seconds();
950}
951
952static int exp_fsid_hash(svc_client *clp, struct svc_export *exp)
953{
954 u32 fsid[2];
955
956 if ((exp->ex_flags & NFSEXP_FSID) == 0)
957 return 0;
958
NeilBrownaf6a4e22007-02-14 00:33:12 -0800959 mk_fsid(FSID_NUM, fsid, 0, 0, exp->ex_fsid, NULL);
960 return exp_set_key(clp, FSID_NUM, fsid, exp);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700961}
962
963static int exp_hash(struct auth_domain *clp, struct svc_export *exp)
964{
965 u32 fsid[2];
Jan Blunck54775492008-02-14 19:38:39 -0800966 struct inode *inode = exp->ex_path.dentry->d_inode;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700967 dev_t dev = inode->i_sb->s_dev;
968
969 if (old_valid_dev(dev)) {
NeilBrownaf6a4e22007-02-14 00:33:12 -0800970 mk_fsid(FSID_DEV, fsid, dev, inode->i_ino, 0, NULL);
971 return exp_set_key(clp, FSID_DEV, fsid, exp);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700972 }
NeilBrownaf6a4e22007-02-14 00:33:12 -0800973 mk_fsid(FSID_ENCODE_DEV, fsid, dev, inode->i_ino, 0, NULL);
974 return exp_set_key(clp, FSID_ENCODE_DEV, fsid, exp);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700975}
976
977static void exp_unhash(struct svc_export *exp)
978{
979 struct svc_expkey *ek;
Jan Blunck54775492008-02-14 19:38:39 -0800980 struct inode *inode = exp->ex_path.dentry->d_inode;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700981
982 ek = exp_get_key(exp->ex_client, inode->i_sb->s_dev, inode->i_ino);
J. Bruce Fields2d3bb252007-07-17 04:04:40 -0700983 if (!IS_ERR(ek)) {
Linus Torvalds1da177e2005-04-16 15:20:36 -0700984 ek->h.expiry_time = get_seconds()-1;
NeilBrownbaab9352006-03-27 01:15:09 -0800985 cache_put(&ek->h, &svc_expkey_cache);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700986 }
987 svc_expkey_cache.nextcheck = get_seconds();
988}
989
990/*
991 * Export a file system.
992 */
993int
994exp_export(struct nfsctl_export *nxp)
995{
996 svc_client *clp;
997 struct svc_export *exp = NULL;
998 struct svc_export new;
999 struct svc_expkey *fsid_key = NULL;
1000 struct nameidata nd;
1001 int err;
1002
1003 /* Consistency check */
1004 err = -EINVAL;
1005 if (!exp_verify_string(nxp->ex_path, NFS_MAXPATHLEN) ||
1006 !exp_verify_string(nxp->ex_client, NFSCLNT_IDMAX))
1007 goto out;
1008
1009 dprintk("exp_export called for %s:%s (%x/%ld fl %x).\n",
1010 nxp->ex_client, nxp->ex_path,
1011 (unsigned)nxp->ex_dev, (long)nxp->ex_ino,
1012 nxp->ex_flags);
1013
1014 /* Try to lock the export table for update */
1015 exp_writelock();
1016
1017 /* Look up client info */
1018 if (!(clp = auth_domain_find(nxp->ex_client)))
1019 goto out_unlock;
1020
1021
1022 /* Look up the dentry */
1023 err = path_lookup(nxp->ex_path, 0, &nd);
1024 if (err)
1025 goto out_unlock;
1026 err = -EINVAL;
1027
Jan Blunck4ac91372008-02-14 19:34:32 -08001028 exp = exp_get_by_name(clp, nd.path.mnt, nd.path.dentry, NULL);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001029
NeilBrownf9884432006-12-13 00:35:45 -08001030 memset(&new, 0, sizeof(new));
1031
Linus Torvalds1da177e2005-04-16 15:20:36 -07001032 /* must make sure there won't be an ex_fsid clash */
1033 if ((nxp->ex_flags & NFSEXP_FSID) &&
J. Bruce Fields2d3bb252007-07-17 04:04:40 -07001034 (!IS_ERR(fsid_key = exp_get_fsid_key(clp, nxp->ex_dev))) &&
Jan Bluncke83aece2008-02-14 19:38:41 -08001035 fsid_key->ek_path.mnt &&
1036 (fsid_key->ek_path.mnt != nd.path.mnt ||
1037 fsid_key->ek_path.dentry != nd.path.dentry))
Linus Torvalds1da177e2005-04-16 15:20:36 -07001038 goto finish;
1039
J. Bruce Fields2d3bb252007-07-17 04:04:40 -07001040 if (!IS_ERR(exp)) {
Linus Torvalds1da177e2005-04-16 15:20:36 -07001041 /* just a flags/id/fsid update */
1042
1043 exp_fsid_unhash(exp);
1044 exp->ex_flags = nxp->ex_flags;
1045 exp->ex_anon_uid = nxp->ex_anon_uid;
1046 exp->ex_anon_gid = nxp->ex_anon_gid;
1047 exp->ex_fsid = nxp->ex_dev;
1048
1049 err = exp_fsid_hash(clp, exp);
1050 goto finish;
1051 }
1052
Jan Blunck4ac91372008-02-14 19:34:32 -08001053 err = check_export(nd.path.dentry->d_inode, nxp->ex_flags, NULL);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001054 if (err) goto finish;
1055
1056 err = -ENOMEM;
1057
1058 dprintk("nfsd: creating export entry %p for client %p\n", exp, clp);
1059
1060 new.h.expiry_time = NEVER;
1061 new.h.flags = 0;
Jan Blunck54775492008-02-14 19:38:39 -08001062 new.ex_pathname = kstrdup(nxp->ex_path, GFP_KERNEL);
1063 if (!new.ex_pathname)
NeilBrownf9884432006-12-13 00:35:45 -08001064 goto finish;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001065 new.ex_client = clp;
Jan Blunck54775492008-02-14 19:38:39 -08001066 new.ex_path = nd.path;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001067 new.ex_flags = nxp->ex_flags;
1068 new.ex_anon_uid = nxp->ex_anon_uid;
1069 new.ex_anon_gid = nxp->ex_anon_gid;
1070 new.ex_fsid = nxp->ex_dev;
1071
NeilBrown4f7774c2006-03-27 01:15:03 -08001072 exp = svc_export_lookup(&new);
1073 if (exp)
1074 exp = svc_export_update(&new, exp);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001075
NeilBrown4f7774c2006-03-27 01:15:03 -08001076 if (!exp)
Linus Torvalds1da177e2005-04-16 15:20:36 -07001077 goto finish;
1078
Linus Torvalds1da177e2005-04-16 15:20:36 -07001079 if (exp_hash(clp, exp) ||
1080 exp_fsid_hash(clp, exp)) {
1081 /* failed to create at least one index */
1082 exp_do_unexport(exp);
1083 cache_flush();
NeilBrownf9884432006-12-13 00:35:45 -08001084 } else
1085 err = 0;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001086finish:
Jan Blunck54775492008-02-14 19:38:39 -08001087 kfree(new.ex_pathname);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001088 if (exp)
1089 exp_put(exp);
1090 if (fsid_key && !IS_ERR(fsid_key))
NeilBrownbaab9352006-03-27 01:15:09 -08001091 cache_put(&fsid_key->h, &svc_expkey_cache);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001092 if (clp)
1093 auth_domain_put(clp);
Jan Blunck1d957f92008-02-14 19:34:35 -08001094 path_put(&nd.path);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001095out_unlock:
1096 exp_writeunlock();
1097out:
1098 return err;
1099}
1100
1101/*
1102 * Unexport a file system. The export entry has already
1103 * been removed from the client's list of exported fs's.
1104 */
1105static void
1106exp_do_unexport(svc_export *unexp)
1107{
1108 unexp->h.expiry_time = get_seconds()-1;
1109 svc_export_cache.nextcheck = get_seconds();
1110 exp_unhash(unexp);
1111 exp_fsid_unhash(unexp);
1112}
1113
1114
1115/*
1116 * unexport syscall.
1117 */
1118int
1119exp_unexport(struct nfsctl_export *nxp)
1120{
1121 struct auth_domain *dom;
1122 svc_export *exp;
1123 struct nameidata nd;
1124 int err;
1125
1126 /* Consistency check */
1127 if (!exp_verify_string(nxp->ex_path, NFS_MAXPATHLEN) ||
1128 !exp_verify_string(nxp->ex_client, NFSCLNT_IDMAX))
1129 return -EINVAL;
1130
1131 exp_writelock();
1132
1133 err = -EINVAL;
1134 dom = auth_domain_find(nxp->ex_client);
1135 if (!dom) {
1136 dprintk("nfsd: unexport couldn't find %s\n", nxp->ex_client);
1137 goto out_unlock;
1138 }
1139
1140 err = path_lookup(nxp->ex_path, 0, &nd);
1141 if (err)
1142 goto out_domain;
1143
1144 err = -EINVAL;
Jan Blunck4ac91372008-02-14 19:34:32 -08001145 exp = exp_get_by_name(dom, nd.path.mnt, nd.path.dentry, NULL);
Jan Blunck1d957f92008-02-14 19:34:35 -08001146 path_put(&nd.path);
J. Bruce Fields2d3bb252007-07-17 04:04:40 -07001147 if (IS_ERR(exp))
Linus Torvalds1da177e2005-04-16 15:20:36 -07001148 goto out_domain;
1149
1150 exp_do_unexport(exp);
1151 exp_put(exp);
1152 err = 0;
1153
1154out_domain:
1155 auth_domain_put(dom);
1156 cache_flush();
1157out_unlock:
1158 exp_writeunlock();
1159 return err;
1160}
1161
1162/*
1163 * Obtain the root fh on behalf of a client.
1164 * This could be done in user space, but I feel that it adds some safety
1165 * since its harder to fool a kernel module than a user space program.
1166 */
1167int
1168exp_rootfh(svc_client *clp, char *path, struct knfsd_fh *f, int maxsize)
1169{
1170 struct svc_export *exp;
1171 struct nameidata nd;
1172 struct inode *inode;
1173 struct svc_fh fh;
1174 int err;
1175
1176 err = -EPERM;
1177 /* NB: we probably ought to check that it's NUL-terminated */
1178 if (path_lookup(path, 0, &nd)) {
1179 printk("nfsd: exp_rootfh path not found %s", path);
1180 return err;
1181 }
Jan Blunck4ac91372008-02-14 19:34:32 -08001182 inode = nd.path.dentry->d_inode;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001183
1184 dprintk("nfsd: exp_rootfh(%s [%p] %s:%s/%ld)\n",
Jan Blunck4ac91372008-02-14 19:34:32 -08001185 path, nd.path.dentry, clp->name,
Linus Torvalds1da177e2005-04-16 15:20:36 -07001186 inode->i_sb->s_id, inode->i_ino);
Jan Blunck4ac91372008-02-14 19:34:32 -08001187 exp = exp_parent(clp, nd.path.mnt, nd.path.dentry, NULL);
J.Bruce Fields4b41bd82006-12-13 00:35:21 -08001188 if (IS_ERR(exp)) {
1189 err = PTR_ERR(exp);
1190 goto out;
1191 }
Linus Torvalds1da177e2005-04-16 15:20:36 -07001192
1193 /*
1194 * fh must be initialized before calling fh_compose
1195 */
1196 fh_init(&fh, maxsize);
Jan Blunck4ac91372008-02-14 19:34:32 -08001197 if (fh_compose(&fh, exp, nd.path.dentry, NULL))
Linus Torvalds1da177e2005-04-16 15:20:36 -07001198 err = -EINVAL;
1199 else
1200 err = 0;
1201 memcpy(f, &fh.fh_handle, sizeof(struct knfsd_fh));
1202 fh_put(&fh);
1203 exp_put(exp);
1204out:
Jan Blunck1d957f92008-02-14 19:34:35 -08001205 path_put(&nd.path);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001206 return err;
1207}
1208
Adrian Bunkcce76f92007-10-16 01:27:52 -07001209static struct svc_export *exp_find(struct auth_domain *clp, int fsid_type,
1210 u32 *fsidv, struct cache_req *reqp)
NeilBrowneab7e2e2006-03-27 01:15:00 -08001211{
1212 struct svc_export *exp;
1213 struct svc_expkey *ek = exp_find_key(clp, fsid_type, fsidv, reqp);
J. Bruce Fields2d3bb252007-07-17 04:04:40 -07001214 if (IS_ERR(ek))
David Howellse231c2e2008-02-07 00:15:26 -08001215 return ERR_CAST(ek);
NeilBrowneab7e2e2006-03-27 01:15:00 -08001216
Jan Bluncke83aece2008-02-14 19:38:41 -08001217 exp = exp_get_by_name(clp, ek->ek_path.mnt, ek->ek_path.dentry, reqp);
NeilBrownbaab9352006-03-27 01:15:09 -08001218 cache_put(&ek->h, &svc_expkey_cache);
NeilBrowneab7e2e2006-03-27 01:15:00 -08001219
J. Bruce Fields2d3bb252007-07-17 04:04:40 -07001220 if (IS_ERR(exp))
David Howellse231c2e2008-02-07 00:15:26 -08001221 return ERR_CAST(exp);
NeilBrowneab7e2e2006-03-27 01:15:00 -08001222 return exp;
1223}
1224
Andy Adamson32c1eb02007-07-17 04:04:48 -07001225__be32 check_nfsd_access(struct svc_export *exp, struct svc_rqst *rqstp)
1226{
1227 struct exp_flavor_info *f;
1228 struct exp_flavor_info *end = exp->ex_flavors + exp->ex_nflavors;
1229
1230 /* legacy gss-only clients are always OK: */
1231 if (exp->ex_client == rqstp->rq_gssclient)
1232 return 0;
1233 /* ip-address based client; check sec= export option: */
1234 for (f = exp->ex_flavors; f < end; f++) {
1235 if (f->pseudoflavor == rqstp->rq_flavor)
1236 return 0;
1237 }
1238 /* defaults in absence of sec= options: */
1239 if (exp->ex_nflavors == 0) {
1240 if (rqstp->rq_flavor == RPC_AUTH_NULL ||
1241 rqstp->rq_flavor == RPC_AUTH_UNIX)
1242 return 0;
1243 }
1244 return nfserr_wrongsec;
1245}
1246
J. Bruce Fields0989a782007-07-17 04:04:44 -07001247/*
J. Bruce Fields2ea22092007-07-17 04:04:46 -07001248 * Uses rq_client and rq_gssclient to find an export; uses rq_client (an
1249 * auth_unix client) if it's available and has secinfo information;
1250 * otherwise, will try to use rq_gssclient.
1251 *
J. Bruce Fields0989a782007-07-17 04:04:44 -07001252 * Called from functions that handle requests; functions that do work on
1253 * behalf of mountd are passed a single client name to use, and should
1254 * use exp_get_by_name() or exp_find().
1255 */
1256struct svc_export *
1257rqst_exp_get_by_name(struct svc_rqst *rqstp, struct vfsmount *mnt,
1258 struct dentry *dentry)
1259{
J. Bruce Fields9a25b962007-07-19 01:49:18 -07001260 struct svc_export *gssexp, *exp = ERR_PTR(-ENOENT);
J. Bruce Fields3ab4d8b2007-07-17 04:04:46 -07001261
J. Bruce Fields2ea22092007-07-17 04:04:46 -07001262 if (rqstp->rq_client == NULL)
1263 goto gss;
1264
1265 /* First try the auth_unix client: */
1266 exp = exp_get_by_name(rqstp->rq_client, mnt, dentry,
1267 &rqstp->rq_chandle);
1268 if (PTR_ERR(exp) == -ENOENT)
1269 goto gss;
1270 if (IS_ERR(exp))
1271 return exp;
1272 /* If it has secinfo, assume there are no gss/... clients */
1273 if (exp->ex_nflavors > 0)
1274 return exp;
1275gss:
1276 /* Otherwise, try falling back on gss client */
1277 if (rqstp->rq_gssclient == NULL)
1278 return exp;
1279 gssexp = exp_get_by_name(rqstp->rq_gssclient, mnt, dentry,
1280 &rqstp->rq_chandle);
1281 if (PTR_ERR(gssexp) == -ENOENT)
1282 return exp;
J. Bruce Fields9a25b962007-07-19 01:49:18 -07001283 if (!IS_ERR(exp))
J. Bruce Fields2ea22092007-07-17 04:04:46 -07001284 exp_put(exp);
1285 return gssexp;
J. Bruce Fields0989a782007-07-17 04:04:44 -07001286}
1287
1288struct svc_export *
1289rqst_exp_find(struct svc_rqst *rqstp, int fsid_type, u32 *fsidv)
1290{
J. Bruce Fields9a25b962007-07-19 01:49:18 -07001291 struct svc_export *gssexp, *exp = ERR_PTR(-ENOENT);
J. Bruce Fields3ab4d8b2007-07-17 04:04:46 -07001292
J. Bruce Fields2ea22092007-07-17 04:04:46 -07001293 if (rqstp->rq_client == NULL)
1294 goto gss;
1295
1296 /* First try the auth_unix client: */
1297 exp = exp_find(rqstp->rq_client, fsid_type, fsidv, &rqstp->rq_chandle);
1298 if (PTR_ERR(exp) == -ENOENT)
1299 goto gss;
1300 if (IS_ERR(exp))
1301 return exp;
1302 /* If it has secinfo, assume there are no gss/... clients */
1303 if (exp->ex_nflavors > 0)
1304 return exp;
1305gss:
1306 /* Otherwise, try falling back on gss client */
1307 if (rqstp->rq_gssclient == NULL)
1308 return exp;
1309 gssexp = exp_find(rqstp->rq_gssclient, fsid_type, fsidv,
1310 &rqstp->rq_chandle);
1311 if (PTR_ERR(gssexp) == -ENOENT)
1312 return exp;
J. Bruce Fields9a25b962007-07-19 01:49:18 -07001313 if (!IS_ERR(exp))
J. Bruce Fields2ea22092007-07-17 04:04:46 -07001314 exp_put(exp);
1315 return gssexp;
J. Bruce Fields0989a782007-07-17 04:04:44 -07001316}
1317
1318struct svc_export *
1319rqst_exp_parent(struct svc_rqst *rqstp, struct vfsmount *mnt,
1320 struct dentry *dentry)
1321{
J. Bruce Fields2ea22092007-07-17 04:04:46 -07001322 struct svc_export *exp;
J. Bruce Fields3ab4d8b2007-07-17 04:04:46 -07001323
J. Bruce Fields2ea22092007-07-17 04:04:46 -07001324 dget(dentry);
1325 exp = rqst_exp_get_by_name(rqstp, mnt, dentry);
1326
1327 while (PTR_ERR(exp) == -ENOENT && !IS_ROOT(dentry)) {
1328 struct dentry *parent;
1329
1330 parent = dget_parent(dentry);
1331 dput(dentry);
1332 dentry = parent;
1333 exp = rqst_exp_get_by_name(rqstp, mnt, dentry);
1334 }
1335 dput(dentry);
1336 return exp;
J. Bruce Fields0989a782007-07-17 04:04:44 -07001337}
NeilBrowneab7e2e2006-03-27 01:15:00 -08001338
Linus Torvalds1da177e2005-04-16 15:20:36 -07001339/*
1340 * Called when we need the filehandle for the root of the pseudofs,
1341 * for a given NFSv4 client. The root is defined to be the
1342 * export point with fsid==0
1343 */
Al Viroc7afef12006-10-19 23:29:02 -07001344__be32
J. Bruce Fieldsdf547ef2007-07-17 04:04:43 -07001345exp_pseudoroot(struct svc_rqst *rqstp, struct svc_fh *fhp)
Linus Torvalds1da177e2005-04-16 15:20:36 -07001346{
NeilBrowneab7e2e2006-03-27 01:15:00 -08001347 struct svc_export *exp;
Al Viroc7afef12006-10-19 23:29:02 -07001348 __be32 rv;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001349 u32 fsidv[2];
1350
NeilBrownaf6a4e22007-02-14 00:33:12 -08001351 mk_fsid(FSID_NUM, fsidv, 0, 0, 0, NULL);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001352
J. Bruce Fields0989a782007-07-17 04:04:44 -07001353 exp = rqst_exp_find(rqstp, FSID_NUM, fsidv);
J.Bruce Fields68993202006-12-13 00:35:23 -08001354 if (IS_ERR(exp))
1355 return nfserrno(PTR_ERR(exp));
Jan Blunck54775492008-02-14 19:38:39 -08001356 rv = fh_compose(fhp, exp, exp->ex_path.dentry, NULL);
Andy Adamson32c1eb02007-07-17 04:04:48 -07001357 if (rv)
1358 goto out;
1359 rv = check_nfsd_access(exp, rqstp);
1360out:
J.Bruce Fieldsd0ebd9c2006-10-04 02:16:10 -07001361 exp_put(exp);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001362 return rv;
1363}
1364
1365/* Iterator */
1366
1367static void *e_start(struct seq_file *m, loff_t *pos)
Josh Triplett896440d2006-10-02 02:17:50 -07001368 __acquires(svc_export_cache.hash_lock)
Linus Torvalds1da177e2005-04-16 15:20:36 -07001369{
1370 loff_t n = *pos;
1371 unsigned hash, export;
1372 struct cache_head *ch;
1373
1374 exp_readlock();
1375 read_lock(&svc_export_cache.hash_lock);
1376 if (!n--)
Greg Banksbc6f02e2006-10-02 02:17:49 -07001377 return SEQ_START_TOKEN;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001378 hash = n >> 32;
1379 export = n & ((1LL<<32) - 1);
1380
1381
1382 for (ch=export_table[hash]; ch; ch=ch->next)
1383 if (!export--)
1384 return ch;
1385 n &= ~((1LL<<32) - 1);
1386 do {
1387 hash++;
1388 n += 1LL<<32;
1389 } while(hash < EXPORT_HASHMAX && export_table[hash]==NULL);
1390 if (hash >= EXPORT_HASHMAX)
1391 return NULL;
1392 *pos = n+1;
1393 return export_table[hash];
1394}
1395
1396static void *e_next(struct seq_file *m, void *p, loff_t *pos)
1397{
1398 struct cache_head *ch = p;
1399 int hash = (*pos >> 32);
1400
Greg Banksbc6f02e2006-10-02 02:17:49 -07001401 if (p == SEQ_START_TOKEN)
Linus Torvalds1da177e2005-04-16 15:20:36 -07001402 hash = 0;
1403 else if (ch->next == NULL) {
1404 hash++;
1405 *pos += 1LL<<32;
1406 } else {
1407 ++*pos;
1408 return ch->next;
1409 }
1410 *pos &= ~((1LL<<32) - 1);
1411 while (hash < EXPORT_HASHMAX && export_table[hash] == NULL) {
1412 hash++;
1413 *pos += 1LL<<32;
1414 }
1415 if (hash >= EXPORT_HASHMAX)
1416 return NULL;
1417 ++*pos;
1418 return export_table[hash];
1419}
1420
1421static void e_stop(struct seq_file *m, void *p)
Josh Triplett896440d2006-10-02 02:17:50 -07001422 __releases(svc_export_cache.hash_lock)
Linus Torvalds1da177e2005-04-16 15:20:36 -07001423{
1424 read_unlock(&svc_export_cache.hash_lock);
1425 exp_readunlock();
1426}
1427
1428static struct flags {
1429 int flag;
1430 char *name[2];
1431} expflags[] = {
1432 { NFSEXP_READONLY, {"ro", "rw"}},
1433 { NFSEXP_INSECURE_PORT, {"insecure", ""}},
1434 { NFSEXP_ROOTSQUASH, {"root_squash", "no_root_squash"}},
1435 { NFSEXP_ALLSQUASH, {"all_squash", ""}},
1436 { NFSEXP_ASYNC, {"async", "sync"}},
1437 { NFSEXP_GATHERED_WRITES, {"wdelay", "no_wdelay"}},
1438 { NFSEXP_NOHIDE, {"nohide", ""}},
1439 { NFSEXP_CROSSMOUNT, {"crossmnt", ""}},
1440 { NFSEXP_NOSUBTREECHECK, {"no_subtree_check", ""}},
1441 { NFSEXP_NOAUTHNLM, {"insecure_locks", ""}},
1442#ifdef MSNFS
1443 { NFSEXP_MSNFS, {"msnfs", ""}},
1444#endif
1445 { 0, {"", ""}}
1446};
1447
J. Bruce Fieldsac34cdb2007-07-17 04:04:49 -07001448static void show_expflags(struct seq_file *m, int flags, int mask)
Linus Torvalds1da177e2005-04-16 15:20:36 -07001449{
Linus Torvalds1da177e2005-04-16 15:20:36 -07001450 struct flags *flg;
J. Bruce Fieldsac34cdb2007-07-17 04:04:49 -07001451 int state, first = 0;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001452
1453 for (flg = expflags; flg->flag; flg++) {
J. Bruce Fieldsac34cdb2007-07-17 04:04:49 -07001454 if (flg->flag & ~mask)
1455 continue;
1456 state = (flg->flag & flags) ? 0 : 1;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001457 if (*flg->name[state])
1458 seq_printf(m, "%s%s", first++?",":"", flg->name[state]);
1459 }
J. Bruce Fieldsac34cdb2007-07-17 04:04:49 -07001460}
1461
J. Bruce Fields91fe39d2007-07-17 04:04:49 -07001462static void show_secinfo_flags(struct seq_file *m, int flags)
1463{
1464 seq_printf(m, ",");
1465 show_expflags(m, flags, NFSEXP_SECINFO_FLAGS);
1466}
1467
1468static void show_secinfo(struct seq_file *m, struct svc_export *exp)
1469{
1470 struct exp_flavor_info *f;
1471 struct exp_flavor_info *end = exp->ex_flavors + exp->ex_nflavors;
1472 int lastflags = 0, first = 0;
1473
1474 if (exp->ex_nflavors == 0)
1475 return;
1476 for (f = exp->ex_flavors; f < end; f++) {
1477 if (first || f->flags != lastflags) {
1478 if (!first)
1479 show_secinfo_flags(m, lastflags);
1480 seq_printf(m, ",sec=%d", f->pseudoflavor);
1481 lastflags = f->flags;
1482 } else {
1483 seq_printf(m, ":%d", f->pseudoflavor);
1484 }
1485 }
1486 show_secinfo_flags(m, lastflags);
1487}
1488
J. Bruce Fieldsac34cdb2007-07-17 04:04:49 -07001489static void exp_flags(struct seq_file *m, int flag, int fsid,
1490 uid_t anonu, uid_t anong, struct nfsd4_fs_locations *fsloc)
1491{
1492 show_expflags(m, flag, NFSEXP_ALLFLAGS);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001493 if (flag & NFSEXP_FSID)
J. Bruce Fieldsac34cdb2007-07-17 04:04:49 -07001494 seq_printf(m, ",fsid=%d", fsid);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001495 if (anonu != (uid_t)-2 && anonu != (0x10000-2))
J. Bruce Fields3e635162007-07-21 04:37:30 -07001496 seq_printf(m, ",anonuid=%u", anonu);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001497 if (anong != (gid_t)-2 && anong != (0x10000-2))
J. Bruce Fields3e635162007-07-21 04:37:30 -07001498 seq_printf(m, ",anongid=%u", anong);
Manoj Naik933469192006-10-04 02:16:18 -07001499 if (fsloc && fsloc->locations_count > 0) {
1500 char *loctype = (fsloc->migrated) ? "refer" : "replicas";
1501 int i;
1502
J. Bruce Fieldsac34cdb2007-07-17 04:04:49 -07001503 seq_printf(m, ",%s=", loctype);
Manoj Naik933469192006-10-04 02:16:18 -07001504 seq_escape(m, fsloc->locations[0].path, ",;@ \t\n\\");
1505 seq_putc(m, '@');
1506 seq_escape(m, fsloc->locations[0].hosts, ",;@ \t\n\\");
1507 for (i = 1; i < fsloc->locations_count; i++) {
1508 seq_putc(m, ';');
1509 seq_escape(m, fsloc->locations[i].path, ",;@ \t\n\\");
1510 seq_putc(m, '@');
1511 seq_escape(m, fsloc->locations[i].hosts, ",;@ \t\n\\");
1512 }
1513 }
Linus Torvalds1da177e2005-04-16 15:20:36 -07001514}
1515
1516static int e_show(struct seq_file *m, void *p)
1517{
1518 struct cache_head *cp = p;
1519 struct svc_export *exp = container_of(cp, struct svc_export, h);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001520
Greg Banksbc6f02e2006-10-02 02:17:49 -07001521 if (p == SEQ_START_TOKEN) {
Linus Torvalds1da177e2005-04-16 15:20:36 -07001522 seq_puts(m, "# Version 1.1\n");
1523 seq_puts(m, "# Path Client(Flags) # IPs\n");
1524 return 0;
1525 }
1526
Linus Torvalds1da177e2005-04-16 15:20:36 -07001527 cache_get(&exp->h);
1528 if (cache_check(&svc_export_cache, &exp->h, NULL))
1529 return 0;
NeilBrownbaab9352006-03-27 01:15:09 -08001530 cache_put(&exp->h, &svc_export_cache);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001531 return svc_export_show(m, &svc_export_cache, cp);
1532}
1533
1534struct seq_operations nfs_exports_op = {
1535 .start = e_start,
1536 .next = e_next,
1537 .stop = e_stop,
1538 .show = e_show,
1539};
1540
1541/*
1542 * Add or modify a client.
1543 * Change requests may involve the list of host addresses. The list of
1544 * exports and possibly existing uid maps are left untouched.
1545 */
1546int
1547exp_addclient(struct nfsctl_client *ncp)
1548{
1549 struct auth_domain *dom;
1550 int i, err;
1551
1552 /* First, consistency check. */
1553 err = -EINVAL;
1554 if (! exp_verify_string(ncp->cl_ident, NFSCLNT_IDMAX))
1555 goto out;
1556 if (ncp->cl_naddr > NFSCLNT_ADDRMAX)
1557 goto out;
1558
1559 /* Lock the hashtable */
1560 exp_writelock();
1561
1562 dom = unix_domain_find(ncp->cl_ident);
1563
1564 err = -ENOMEM;
1565 if (!dom)
1566 goto out_unlock;
1567
1568 /* Insert client into hashtable. */
1569 for (i = 0; i < ncp->cl_naddr; i++)
1570 auth_unix_add_addr(ncp->cl_addrlist[i], dom);
1571
1572 auth_unix_forget_old(dom);
1573 auth_domain_put(dom);
1574
1575 err = 0;
1576
1577out_unlock:
1578 exp_writeunlock();
1579out:
1580 return err;
1581}
1582
1583/*
1584 * Delete a client given an identifier.
1585 */
1586int
1587exp_delclient(struct nfsctl_client *ncp)
1588{
1589 int err;
1590 struct auth_domain *dom;
1591
1592 err = -EINVAL;
1593 if (!exp_verify_string(ncp->cl_ident, NFSCLNT_IDMAX))
1594 goto out;
1595
1596 /* Lock the hashtable */
1597 exp_writelock();
1598
1599 dom = auth_domain_find(ncp->cl_ident);
1600 /* just make sure that no addresses work
1601 * and that it will expire soon
1602 */
1603 if (dom) {
1604 err = auth_unix_forget_old(dom);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001605 auth_domain_put(dom);
1606 }
1607
1608 exp_writeunlock();
1609out:
1610 return err;
1611}
1612
1613/*
1614 * Verify that string is non-empty and does not exceed max length.
1615 */
1616static int
1617exp_verify_string(char *cp, int max)
1618{
1619 int i;
1620
1621 for (i = 0; i < max; i++)
1622 if (!cp[i])
1623 return i;
1624 cp[i] = 0;
1625 printk(KERN_NOTICE "nfsd: couldn't validate string %s\n", cp);
1626 return 0;
1627}
1628
1629/*
1630 * Initialize the exports module.
1631 */
J. Bruce Fieldsdbf847e2007-11-08 17:20:34 -05001632int
Linus Torvalds1da177e2005-04-16 15:20:36 -07001633nfsd_export_init(void)
1634{
J. Bruce Fieldsdbf847e2007-11-08 17:20:34 -05001635 int rv;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001636 dprintk("nfsd: initializing export module.\n");
1637
J. Bruce Fieldsdbf847e2007-11-08 17:20:34 -05001638 rv = cache_register(&svc_export_cache);
1639 if (rv)
1640 return rv;
1641 rv = cache_register(&svc_expkey_cache);
1642 if (rv)
1643 cache_unregister(&svc_export_cache);
1644 return rv;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001645
1646}
1647
1648/*
1649 * Flush exports table - called when last nfsd thread is killed
1650 */
1651void
1652nfsd_export_flush(void)
1653{
1654 exp_writelock();
1655 cache_purge(&svc_expkey_cache);
1656 cache_purge(&svc_export_cache);
1657 exp_writeunlock();
1658}
1659
1660/*
1661 * Shutdown the exports module.
1662 */
1663void
1664nfsd_export_shutdown(void)
1665{
1666
1667 dprintk("nfsd: shutting down export module.\n");
1668
1669 exp_writelock();
1670
J. Bruce Fieldsdf95a9d2007-11-08 16:09:59 -05001671 cache_unregister(&svc_expkey_cache);
1672 cache_unregister(&svc_export_cache);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001673 svcauth_unix_purge();
1674
1675 exp_writeunlock();
1676 dprintk("nfsd: export shutdown complete.\n");
1677}