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1/*
2 * NFS exporting and validation.
3 *
4 * We maintain a list of clients, each of which has a list of
5 * exports. To export an fs to a given client, you first have
6 * to create the client entry with NFSCTL_ADDCLIENT, which
7 * creates a client control block and adds it to the hash
8 * table. Then, you call NFSCTL_EXPORT for each fs.
9 *
10 *
11 * Copyright (C) 1995, 1996 Olaf Kirch, <okir@monad.swb.de>
12 */
13
14#include <linux/slab.h>
15#include <linux/namei.h>
16#include <linux/module.h>
17#include <linux/exportfs.h>
18
19#include <linux/nfsd/syscall.h>
20#include <net/ipv6.h>
21
22#include "nfsd.h"
23#include "nfsfh.h"
24
25#define NFSDDBG_FACILITY NFSDDBG_EXPORT
26
27typedef struct auth_domain svc_client;
28typedef struct svc_export svc_export;
29
30/*
31 * We have two caches.
32 * One maps client+vfsmnt+dentry to export options - the export map
33 * The other maps client+filehandle-fragment to export options. - the expkey map
34 *
35 * The export options are actually stored in the first map, and the
36 * second map contains a reference to the entry in the first map.
37 */
38
39#define EXPKEY_HASHBITS 8
40#define EXPKEY_HASHMAX (1 << EXPKEY_HASHBITS)
41#define EXPKEY_HASHMASK (EXPKEY_HASHMAX -1)
42static struct cache_head *expkey_table[EXPKEY_HASHMAX];
43
44static void expkey_put(struct kref *ref)
45{
46 struct svc_expkey *key = container_of(ref, struct svc_expkey, h.ref);
47
48 if (test_bit(CACHE_VALID, &key->h.flags) &&
49 !test_bit(CACHE_NEGATIVE, &key->h.flags))
50 path_put(&key->ek_path);
51 auth_domain_put(key->ek_client);
52 kfree(key);
53}
54
55static void expkey_request(struct cache_detail *cd,
56 struct cache_head *h,
57 char **bpp, int *blen)
58{
59 /* client fsidtype \xfsid */
60 struct svc_expkey *ek = container_of(h, struct svc_expkey, h);
61 char type[5];
62
63 qword_add(bpp, blen, ek->ek_client->name);
64 snprintf(type, 5, "%d", ek->ek_fsidtype);
65 qword_add(bpp, blen, type);
66 qword_addhex(bpp, blen, (char*)ek->ek_fsid, key_len(ek->ek_fsidtype));
67 (*bpp)[-1] = '\n';
68}
69
70static int expkey_upcall(struct cache_detail *cd, struct cache_head *h)
71{
72 return sunrpc_cache_pipe_upcall(cd, h, expkey_request);
73}
74
75static struct svc_expkey *svc_expkey_update(struct svc_expkey *new, struct svc_expkey *old);
76static struct svc_expkey *svc_expkey_lookup(struct svc_expkey *);
77static struct cache_detail svc_expkey_cache;
78
79static int expkey_parse(struct cache_detail *cd, char *mesg, int mlen)
80{
81 /* client fsidtype fsid [path] */
82 char *buf;
83 int len;
84 struct auth_domain *dom = NULL;
85 int err;
86 int fsidtype;
87 char *ep;
88 struct svc_expkey key;
89 struct svc_expkey *ek = NULL;
90
91 if (mesg[mlen-1] != '\n')
92 return -EINVAL;
93 mesg[mlen-1] = 0;
94
95 buf = kmalloc(PAGE_SIZE, GFP_KERNEL);
96 err = -ENOMEM;
97 if (!buf)
98 goto out;
99
100 err = -EINVAL;
101 if ((len=qword_get(&mesg, buf, PAGE_SIZE)) <= 0)
102 goto out;
103
104 err = -ENOENT;
105 dom = auth_domain_find(buf);
106 if (!dom)
107 goto out;
108 dprintk("found domain %s\n", buf);
109
110 err = -EINVAL;
111 if ((len=qword_get(&mesg, buf, PAGE_SIZE)) <= 0)
112 goto out;
113 fsidtype = simple_strtoul(buf, &ep, 10);
114 if (*ep)
115 goto out;
116 dprintk("found fsidtype %d\n", fsidtype);
117 if (key_len(fsidtype)==0) /* invalid type */
118 goto out;
119 if ((len=qword_get(&mesg, buf, PAGE_SIZE)) <= 0)
120 goto out;
121 dprintk("found fsid length %d\n", len);
122 if (len != key_len(fsidtype))
123 goto out;
124
125 /* OK, we seem to have a valid key */
126 key.h.flags = 0;
127 key.h.expiry_time = get_expiry(&mesg);
128 if (key.h.expiry_time == 0)
129 goto out;
130
131 key.ek_client = dom;
132 key.ek_fsidtype = fsidtype;
133 memcpy(key.ek_fsid, buf, len);
134
135 ek = svc_expkey_lookup(&key);
136 err = -ENOMEM;
137 if (!ek)
138 goto out;
139
140 /* now we want a pathname, or empty meaning NEGATIVE */
141 err = -EINVAL;
142 len = qword_get(&mesg, buf, PAGE_SIZE);
143 if (len < 0)
144 goto out;
145 dprintk("Path seems to be <%s>\n", buf);
146 err = 0;
147 if (len == 0) {
148 set_bit(CACHE_NEGATIVE, &key.h.flags);
149 ek = svc_expkey_update(&key, ek);
150 if (!ek)
151 err = -ENOMEM;
152 } else {
153 err = kern_path(buf, 0, &key.ek_path);
154 if (err)
155 goto out;
156
157 dprintk("Found the path %s\n", buf);
158
159 ek = svc_expkey_update(&key, ek);
160 if (!ek)
161 err = -ENOMEM;
162 path_put(&key.ek_path);
163 }
164 cache_flush();
165 out:
166 if (ek)
167 cache_put(&ek->h, &svc_expkey_cache);
168 if (dom)
169 auth_domain_put(dom);
170 kfree(buf);
171 return err;
172}
173
174static int expkey_show(struct seq_file *m,
175 struct cache_detail *cd,
176 struct cache_head *h)
177{
178 struct svc_expkey *ek ;
179 int i;
180
181 if (h ==NULL) {
182 seq_puts(m, "#domain fsidtype fsid [path]\n");
183 return 0;
184 }
185 ek = container_of(h, struct svc_expkey, h);
186 seq_printf(m, "%s %d 0x", ek->ek_client->name,
187 ek->ek_fsidtype);
188 for (i=0; i < key_len(ek->ek_fsidtype)/4; i++)
189 seq_printf(m, "%08x", ek->ek_fsid[i]);
190 if (test_bit(CACHE_VALID, &h->flags) &&
191 !test_bit(CACHE_NEGATIVE, &h->flags)) {
192 seq_printf(m, " ");
193 seq_path(m, &ek->ek_path, "\\ \t\n");
194 }
195 seq_printf(m, "\n");
196 return 0;
197}
198
199static inline int expkey_match (struct cache_head *a, struct cache_head *b)
200{
201 struct svc_expkey *orig = container_of(a, struct svc_expkey, h);
202 struct svc_expkey *new = container_of(b, struct svc_expkey, h);
203
204 if (orig->ek_fsidtype != new->ek_fsidtype ||
205 orig->ek_client != new->ek_client ||
206 memcmp(orig->ek_fsid, new->ek_fsid, key_len(orig->ek_fsidtype)) != 0)
207 return 0;
208 return 1;
209}
210
211static inline void expkey_init(struct cache_head *cnew,
212 struct cache_head *citem)
213{
214 struct svc_expkey *new = container_of(cnew, struct svc_expkey, h);
215 struct svc_expkey *item = container_of(citem, struct svc_expkey, h);
216
217 kref_get(&item->ek_client->ref);
218 new->ek_client = item->ek_client;
219 new->ek_fsidtype = item->ek_fsidtype;
220
221 memcpy(new->ek_fsid, item->ek_fsid, sizeof(new->ek_fsid));
222}
223
224static inline void expkey_update(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 new->ek_path = item->ek_path;
231 path_get(&item->ek_path);
232}
233
234static struct cache_head *expkey_alloc(void)
235{
236 struct svc_expkey *i = kmalloc(sizeof(*i), GFP_KERNEL);
237 if (i)
238 return &i->h;
239 else
240 return NULL;
241}
242
243static struct cache_detail svc_expkey_cache = {
244 .owner = THIS_MODULE,
245 .hash_size = EXPKEY_HASHMAX,
246 .hash_table = expkey_table,
247 .name = "nfsd.fh",
248 .cache_put = expkey_put,
249 .cache_upcall = expkey_upcall,
250 .cache_parse = expkey_parse,
251 .cache_show = expkey_show,
252 .match = expkey_match,
253 .init = expkey_init,
254 .update = expkey_update,
255 .alloc = expkey_alloc,
256};
257
258static int
259svc_expkey_hash(struct svc_expkey *item)
260{
261 int hash = item->ek_fsidtype;
262 char * cp = (char*)item->ek_fsid;
263 int len = key_len(item->ek_fsidtype);
264
265 hash ^= hash_mem(cp, len, EXPKEY_HASHBITS);
266 hash ^= hash_ptr(item->ek_client, EXPKEY_HASHBITS);
267 hash &= EXPKEY_HASHMASK;
268 return hash;
269}
270
271static struct svc_expkey *
272svc_expkey_lookup(struct svc_expkey *item)
273{
274 struct cache_head *ch;
275 int hash = svc_expkey_hash(item);
276
277 ch = sunrpc_cache_lookup(&svc_expkey_cache, &item->h,
278 hash);
279 if (ch)
280 return container_of(ch, struct svc_expkey, h);
281 else
282 return NULL;
283}
284
285static struct svc_expkey *
286svc_expkey_update(struct svc_expkey *new, struct svc_expkey *old)
287{
288 struct cache_head *ch;
289 int hash = svc_expkey_hash(new);
290
291 ch = sunrpc_cache_update(&svc_expkey_cache, &new->h,
292 &old->h, hash);
293 if (ch)
294 return container_of(ch, struct svc_expkey, h);
295 else
296 return NULL;
297}
298
299
300#define EXPORT_HASHBITS 8
301#define EXPORT_HASHMAX (1<< EXPORT_HASHBITS)
302
303static struct cache_head *export_table[EXPORT_HASHMAX];
304
305static void nfsd4_fslocs_free(struct nfsd4_fs_locations *fsloc)
306{
307 int i;
308
309 for (i = 0; i < fsloc->locations_count; i++) {
310 kfree(fsloc->locations[i].path);
311 kfree(fsloc->locations[i].hosts);
312 }
313 kfree(fsloc->locations);
314}
315
316static void svc_export_put(struct kref *ref)
317{
318 struct svc_export *exp = container_of(ref, struct svc_export, h.ref);
319 path_put(&exp->ex_path);
320 auth_domain_put(exp->ex_client);
321 kfree(exp->ex_pathname);
322 nfsd4_fslocs_free(&exp->ex_fslocs);
323 kfree(exp);
324}
325
326static void svc_export_request(struct cache_detail *cd,
327 struct cache_head *h,
328 char **bpp, int *blen)
329{
330 /* client path */
331 struct svc_export *exp = container_of(h, struct svc_export, h);
332 char *pth;
333
334 qword_add(bpp, blen, exp->ex_client->name);
335 pth = d_path(&exp->ex_path, *bpp, *blen);
336 if (IS_ERR(pth)) {
337 /* is this correct? */
338 (*bpp)[0] = '\n';
339 return;
340 }
341 qword_add(bpp, blen, pth);
342 (*bpp)[-1] = '\n';
343}
344
345static int svc_export_upcall(struct cache_detail *cd, struct cache_head *h)
346{
347 return sunrpc_cache_pipe_upcall(cd, h, svc_export_request);
348}
349
350static struct svc_export *svc_export_update(struct svc_export *new,
351 struct svc_export *old);
352static struct svc_export *svc_export_lookup(struct svc_export *);
353
354static int check_export(struct inode *inode, int *flags, unsigned char *uuid)
355{
356
357 /*
358 * We currently export only dirs, regular files, and (for v4
359 * pseudoroot) symlinks.
360 */
361 if (!S_ISDIR(inode->i_mode) &&
362 !S_ISLNK(inode->i_mode) &&
363 !S_ISREG(inode->i_mode))
364 return -ENOTDIR;
365
366 /*
367 * Mountd should never pass down a writeable V4ROOT export, but,
368 * just to make sure:
369 */
370 if (*flags & NFSEXP_V4ROOT)
371 *flags |= NFSEXP_READONLY;
372
373 /* There are two requirements on a filesystem to be exportable.
374 * 1: We must be able to identify the filesystem from a number.
375 * either a device number (so FS_REQUIRES_DEV needed)
376 * or an FSID number (so NFSEXP_FSID or ->uuid is needed).
377 * 2: We must be able to find an inode from a filehandle.
378 * This means that s_export_op must be set.
379 */
380 if (!(inode->i_sb->s_type->fs_flags & FS_REQUIRES_DEV) &&
381 !(*flags & NFSEXP_FSID) &&
382 uuid == NULL) {
383 dprintk("exp_export: export of non-dev fs without fsid\n");
384 return -EINVAL;
385 }
386
387 if (!inode->i_sb->s_export_op ||
388 !inode->i_sb->s_export_op->fh_to_dentry) {
389 dprintk("exp_export: export of invalid fs type.\n");
390 return -EINVAL;
391 }
392
393 return 0;
394
395}
396
397#ifdef CONFIG_NFSD_V4
398
399static int
400fsloc_parse(char **mesg, char *buf, struct nfsd4_fs_locations *fsloc)
401{
402 int len;
403 int migrated, i, err;
404
405 /* listsize */
406 err = get_int(mesg, &fsloc->locations_count);
407 if (err)
408 return err;
409 if (fsloc->locations_count > MAX_FS_LOCATIONS)
410 return -EINVAL;
411 if (fsloc->locations_count == 0)
412 return 0;
413
414 fsloc->locations = kzalloc(fsloc->locations_count
415 * sizeof(struct nfsd4_fs_location), GFP_KERNEL);
416 if (!fsloc->locations)
417 return -ENOMEM;
418 for (i=0; i < fsloc->locations_count; i++) {
419 /* colon separated host list */
420 err = -EINVAL;
421 len = qword_get(mesg, buf, PAGE_SIZE);
422 if (len <= 0)
423 goto out_free_all;
424 err = -ENOMEM;
425 fsloc->locations[i].hosts = kstrdup(buf, GFP_KERNEL);
426 if (!fsloc->locations[i].hosts)
427 goto out_free_all;
428 err = -EINVAL;
429 /* slash separated path component list */
430 len = qword_get(mesg, buf, PAGE_SIZE);
431 if (len <= 0)
432 goto out_free_all;
433 err = -ENOMEM;
434 fsloc->locations[i].path = kstrdup(buf, GFP_KERNEL);
435 if (!fsloc->locations[i].path)
436 goto out_free_all;
437 }
438 /* migrated */
439 err = get_int(mesg, &migrated);
440 if (err)
441 goto out_free_all;
442 err = -EINVAL;
443 if (migrated < 0 || migrated > 1)
444 goto out_free_all;
445 fsloc->migrated = migrated;
446 return 0;
447out_free_all:
448 nfsd4_fslocs_free(fsloc);
449 return err;
450}
451
452static int secinfo_parse(char **mesg, char *buf, struct svc_export *exp)
453{
454 int listsize, err;
455 struct exp_flavor_info *f;
456
457 err = get_int(mesg, &listsize);
458 if (err)
459 return err;
460 if (listsize < 0 || listsize > MAX_SECINFO_LIST)
461 return -EINVAL;
462
463 for (f = exp->ex_flavors; f < exp->ex_flavors + listsize; f++) {
464 err = get_int(mesg, &f->pseudoflavor);
465 if (err)
466 return err;
467 /*
468 * XXX: It would be nice to also check whether this
469 * pseudoflavor is supported, so we can discover the
470 * problem at export time instead of when a client fails
471 * to authenticate.
472 */
473 err = get_int(mesg, &f->flags);
474 if (err)
475 return err;
476 /* Only some flags are allowed to differ between flavors: */
477 if (~NFSEXP_SECINFO_FLAGS & (f->flags ^ exp->ex_flags))
478 return -EINVAL;
479 }
480 exp->ex_nflavors = listsize;
481 return 0;
482}
483
484#else /* CONFIG_NFSD_V4 */
485static inline int
486fsloc_parse(char **mesg, char *buf, struct nfsd4_fs_locations *fsloc){return 0;}
487static inline int
488secinfo_parse(char **mesg, char *buf, struct svc_export *exp) { return 0; }
489#endif
490
491static int svc_export_parse(struct cache_detail *cd, char *mesg, int mlen)
492{
493 /* client path expiry [flags anonuid anongid fsid] */
494 char *buf;
495 int len;
496 int err;
497 struct auth_domain *dom = NULL;
498 struct svc_export exp = {}, *expp;
499 int an_int;
500
501 if (mesg[mlen-1] != '\n')
502 return -EINVAL;
503 mesg[mlen-1] = 0;
504
505 buf = kmalloc(PAGE_SIZE, GFP_KERNEL);
506 if (!buf)
507 return -ENOMEM;
508
509 /* client */
510 err = -EINVAL;
511 len = qword_get(&mesg, buf, PAGE_SIZE);
512 if (len <= 0)
513 goto out;
514
515 err = -ENOENT;
516 dom = auth_domain_find(buf);
517 if (!dom)
518 goto out;
519
520 /* path */
521 err = -EINVAL;
522 if ((len = qword_get(&mesg, buf, PAGE_SIZE)) <= 0)
523 goto out1;
524
525 err = kern_path(buf, 0, &exp.ex_path);
526 if (err)
527 goto out1;
528
529 exp.ex_client = dom;
530
531 err = -ENOMEM;
532 exp.ex_pathname = kstrdup(buf, GFP_KERNEL);
533 if (!exp.ex_pathname)
534 goto out2;
535
536 /* expiry */
537 err = -EINVAL;
538 exp.h.expiry_time = get_expiry(&mesg);
539 if (exp.h.expiry_time == 0)
540 goto out3;
541
542 /* flags */
543 err = get_int(&mesg, &an_int);
544 if (err == -ENOENT) {
545 err = 0;
546 set_bit(CACHE_NEGATIVE, &exp.h.flags);
547 } else {
548 if (err || an_int < 0)
549 goto out3;
550 exp.ex_flags= an_int;
551
552 /* anon uid */
553 err = get_int(&mesg, &an_int);
554 if (err)
555 goto out3;
556 exp.ex_anon_uid= an_int;
557
558 /* anon gid */
559 err = get_int(&mesg, &an_int);
560 if (err)
561 goto out3;
562 exp.ex_anon_gid= an_int;
563
564 /* fsid */
565 err = get_int(&mesg, &an_int);
566 if (err)
567 goto out3;
568 exp.ex_fsid = an_int;
569
570 while ((len = qword_get(&mesg, buf, PAGE_SIZE)) > 0) {
571 if (strcmp(buf, "fsloc") == 0)
572 err = fsloc_parse(&mesg, buf, &exp.ex_fslocs);
573 else if (strcmp(buf, "uuid") == 0) {
574 /* expect a 16 byte uuid encoded as \xXXXX... */
575 len = qword_get(&mesg, buf, PAGE_SIZE);
576 if (len != 16)
577 err = -EINVAL;
578 else {
579 exp.ex_uuid =
580 kmemdup(buf, 16, GFP_KERNEL);
581 if (exp.ex_uuid == NULL)
582 err = -ENOMEM;
583 }
584 } else if (strcmp(buf, "secinfo") == 0)
585 err = secinfo_parse(&mesg, buf, &exp);
586 else
587 /* quietly ignore unknown words and anything
588 * following. Newer user-space can try to set
589 * new values, then see what the result was.
590 */
591 break;
592 if (err)
593 goto out4;
594 }
595
596 err = check_export(exp.ex_path.dentry->d_inode, &exp.ex_flags,
597 exp.ex_uuid);
598 if (err)
599 goto out4;
600 }
601
602 expp = svc_export_lookup(&exp);
603 if (expp)
604 expp = svc_export_update(&exp, expp);
605 else
606 err = -ENOMEM;
607 cache_flush();
608 if (expp == NULL)
609 err = -ENOMEM;
610 else
611 exp_put(expp);
612out4:
613 nfsd4_fslocs_free(&exp.ex_fslocs);
614 kfree(exp.ex_uuid);
615out3:
616 kfree(exp.ex_pathname);
617out2:
618 path_put(&exp.ex_path);
619out1:
620 auth_domain_put(dom);
621out:
622 kfree(buf);
623 return err;
624}
625
626static void exp_flags(struct seq_file *m, int flag, int fsid,
627 uid_t anonu, uid_t anong, struct nfsd4_fs_locations *fslocs);
628static void show_secinfo(struct seq_file *m, struct svc_export *exp);
629
630static int svc_export_show(struct seq_file *m,
631 struct cache_detail *cd,
632 struct cache_head *h)
633{
634 struct svc_export *exp ;
635
636 if (h ==NULL) {
637 seq_puts(m, "#path domain(flags)\n");
638 return 0;
639 }
640 exp = container_of(h, struct svc_export, h);
641 seq_path(m, &exp->ex_path, " \t\n\\");
642 seq_putc(m, '\t');
643 seq_escape(m, exp->ex_client->name, " \t\n\\");
644 seq_putc(m, '(');
645 if (test_bit(CACHE_VALID, &h->flags) &&
646 !test_bit(CACHE_NEGATIVE, &h->flags)) {
647 exp_flags(m, exp->ex_flags, exp->ex_fsid,
648 exp->ex_anon_uid, exp->ex_anon_gid, &exp->ex_fslocs);
649 if (exp->ex_uuid) {
650 int i;
651 seq_puts(m, ",uuid=");
652 for (i=0; i<16; i++) {
653 if ((i&3) == 0 && i)
654 seq_putc(m, ':');
655 seq_printf(m, "%02x", exp->ex_uuid[i]);
656 }
657 }
658 show_secinfo(m, exp);
659 }
660 seq_puts(m, ")\n");
661 return 0;
662}
663static int svc_export_match(struct cache_head *a, struct cache_head *b)
664{
665 struct svc_export *orig = container_of(a, struct svc_export, h);
666 struct svc_export *new = container_of(b, struct svc_export, h);
667 return orig->ex_client == new->ex_client &&
668 orig->ex_path.dentry == new->ex_path.dentry &&
669 orig->ex_path.mnt == new->ex_path.mnt;
670}
671
672static void svc_export_init(struct cache_head *cnew, struct cache_head *citem)
673{
674 struct svc_export *new = container_of(cnew, struct svc_export, h);
675 struct svc_export *item = container_of(citem, struct svc_export, h);
676
677 kref_get(&item->ex_client->ref);
678 new->ex_client = item->ex_client;
679 new->ex_path.dentry = dget(item->ex_path.dentry);
680 new->ex_path.mnt = mntget(item->ex_path.mnt);
681 new->ex_pathname = NULL;
682 new->ex_fslocs.locations = NULL;
683 new->ex_fslocs.locations_count = 0;
684 new->ex_fslocs.migrated = 0;
685}
686
687static void export_update(struct cache_head *cnew, struct cache_head *citem)
688{
689 struct svc_export *new = container_of(cnew, struct svc_export, h);
690 struct svc_export *item = container_of(citem, struct svc_export, h);
691 int i;
692
693 new->ex_flags = item->ex_flags;
694 new->ex_anon_uid = item->ex_anon_uid;
695 new->ex_anon_gid = item->ex_anon_gid;
696 new->ex_fsid = item->ex_fsid;
697 new->ex_uuid = item->ex_uuid;
698 item->ex_uuid = NULL;
699 new->ex_pathname = item->ex_pathname;
700 item->ex_pathname = NULL;
701 new->ex_fslocs.locations = item->ex_fslocs.locations;
702 item->ex_fslocs.locations = NULL;
703 new->ex_fslocs.locations_count = item->ex_fslocs.locations_count;
704 item->ex_fslocs.locations_count = 0;
705 new->ex_fslocs.migrated = item->ex_fslocs.migrated;
706 item->ex_fslocs.migrated = 0;
707 new->ex_nflavors = item->ex_nflavors;
708 for (i = 0; i < MAX_SECINFO_LIST; i++) {
709 new->ex_flavors[i] = item->ex_flavors[i];
710 }
711}
712
713static struct cache_head *svc_export_alloc(void)
714{
715 struct svc_export *i = kmalloc(sizeof(*i), GFP_KERNEL);
716 if (i)
717 return &i->h;
718 else
719 return NULL;
720}
721
722struct cache_detail svc_export_cache = {
723 .owner = THIS_MODULE,
724 .hash_size = EXPORT_HASHMAX,
725 .hash_table = export_table,
726 .name = "nfsd.export",
727 .cache_put = svc_export_put,
728 .cache_upcall = svc_export_upcall,
729 .cache_parse = svc_export_parse,
730 .cache_show = svc_export_show,
731 .match = svc_export_match,
732 .init = svc_export_init,
733 .update = export_update,
734 .alloc = svc_export_alloc,
735};
736
737static int
738svc_export_hash(struct svc_export *exp)
739{
740 int hash;
741
742 hash = hash_ptr(exp->ex_client, EXPORT_HASHBITS);
743 hash ^= hash_ptr(exp->ex_path.dentry, EXPORT_HASHBITS);
744 hash ^= hash_ptr(exp->ex_path.mnt, EXPORT_HASHBITS);
745 return hash;
746}
747
748static struct svc_export *
749svc_export_lookup(struct svc_export *exp)
750{
751 struct cache_head *ch;
752 int hash = svc_export_hash(exp);
753
754 ch = sunrpc_cache_lookup(&svc_export_cache, &exp->h,
755 hash);
756 if (ch)
757 return container_of(ch, struct svc_export, h);
758 else
759 return NULL;
760}
761
762static struct svc_export *
763svc_export_update(struct svc_export *new, struct svc_export *old)
764{
765 struct cache_head *ch;
766 int hash = svc_export_hash(old);
767
768 ch = sunrpc_cache_update(&svc_export_cache, &new->h,
769 &old->h,
770 hash);
771 if (ch)
772 return container_of(ch, struct svc_export, h);
773 else
774 return NULL;
775}
776
777
778static struct svc_expkey *
779exp_find_key(svc_client *clp, int fsid_type, u32 *fsidv, struct cache_req *reqp)
780{
781 struct svc_expkey key, *ek;
782 int err;
783
784 if (!clp)
785 return ERR_PTR(-ENOENT);
786
787 key.ek_client = clp;
788 key.ek_fsidtype = fsid_type;
789 memcpy(key.ek_fsid, fsidv, key_len(fsid_type));
790
791 ek = svc_expkey_lookup(&key);
792 if (ek == NULL)
793 return ERR_PTR(-ENOMEM);
794 err = cache_check(&svc_expkey_cache, &ek->h, reqp);
795 if (err)
796 return ERR_PTR(err);
797 return ek;
798}
799
800
801static svc_export *exp_get_by_name(svc_client *clp, const struct path *path,
802 struct cache_req *reqp)
803{
804 struct svc_export *exp, key;
805 int err;
806
807 if (!clp)
808 return ERR_PTR(-ENOENT);
809
810 key.ex_client = clp;
811 key.ex_path = *path;
812
813 exp = svc_export_lookup(&key);
814 if (exp == NULL)
815 return ERR_PTR(-ENOMEM);
816 err = cache_check(&svc_export_cache, &exp->h, reqp);
817 if (err)
818 return ERR_PTR(err);
819 return exp;
820}
821
822/*
823 * Find the export entry for a given dentry.
824 */
825static struct svc_export *exp_parent(svc_client *clp, struct path *path)
826{
827 struct dentry *saved = dget(path->dentry);
828 svc_export *exp = exp_get_by_name(clp, path, NULL);
829
830 while (PTR_ERR(exp) == -ENOENT && !IS_ROOT(path->dentry)) {
831 struct dentry *parent = dget_parent(path->dentry);
832 dput(path->dentry);
833 path->dentry = parent;
834 exp = exp_get_by_name(clp, path, NULL);
835 }
836 dput(path->dentry);
837 path->dentry = saved;
838 return exp;
839}
840
841
842
843/*
844 * Obtain the root fh on behalf of a client.
845 * This could be done in user space, but I feel that it adds some safety
846 * since its harder to fool a kernel module than a user space program.
847 */
848int
849exp_rootfh(svc_client *clp, char *name, struct knfsd_fh *f, int maxsize)
850{
851 struct svc_export *exp;
852 struct path path;
853 struct inode *inode;
854 struct svc_fh fh;
855 int err;
856
857 err = -EPERM;
858 /* NB: we probably ought to check that it's NUL-terminated */
859 if (kern_path(name, 0, &path)) {
860 printk("nfsd: exp_rootfh path not found %s", name);
861 return err;
862 }
863 inode = path.dentry->d_inode;
864
865 dprintk("nfsd: exp_rootfh(%s [%p] %s:%s/%ld)\n",
866 name, path.dentry, clp->name,
867 inode->i_sb->s_id, inode->i_ino);
868 exp = exp_parent(clp, &path);
869 if (IS_ERR(exp)) {
870 err = PTR_ERR(exp);
871 goto out;
872 }
873
874 /*
875 * fh must be initialized before calling fh_compose
876 */
877 fh_init(&fh, maxsize);
878 if (fh_compose(&fh, exp, path.dentry, NULL))
879 err = -EINVAL;
880 else
881 err = 0;
882 memcpy(f, &fh.fh_handle, sizeof(struct knfsd_fh));
883 fh_put(&fh);
884 exp_put(exp);
885out:
886 path_put(&path);
887 return err;
888}
889
890static struct svc_export *exp_find(struct auth_domain *clp, int fsid_type,
891 u32 *fsidv, struct cache_req *reqp)
892{
893 struct svc_export *exp;
894 struct svc_expkey *ek = exp_find_key(clp, fsid_type, fsidv, reqp);
895 if (IS_ERR(ek))
896 return ERR_CAST(ek);
897
898 exp = exp_get_by_name(clp, &ek->ek_path, reqp);
899 cache_put(&ek->h, &svc_expkey_cache);
900
901 if (IS_ERR(exp))
902 return ERR_CAST(exp);
903 return exp;
904}
905
906__be32 check_nfsd_access(struct svc_export *exp, struct svc_rqst *rqstp)
907{
908 struct exp_flavor_info *f;
909 struct exp_flavor_info *end = exp->ex_flavors + exp->ex_nflavors;
910
911 /* legacy gss-only clients are always OK: */
912 if (exp->ex_client == rqstp->rq_gssclient)
913 return 0;
914 /* ip-address based client; check sec= export option: */
915 for (f = exp->ex_flavors; f < end; f++) {
916 if (f->pseudoflavor == rqstp->rq_flavor)
917 return 0;
918 }
919 /* defaults in absence of sec= options: */
920 if (exp->ex_nflavors == 0) {
921 if (rqstp->rq_flavor == RPC_AUTH_NULL ||
922 rqstp->rq_flavor == RPC_AUTH_UNIX)
923 return 0;
924 }
925 return nfserr_wrongsec;
926}
927
928/*
929 * Uses rq_client and rq_gssclient to find an export; uses rq_client (an
930 * auth_unix client) if it's available and has secinfo information;
931 * otherwise, will try to use rq_gssclient.
932 *
933 * Called from functions that handle requests; functions that do work on
934 * behalf of mountd are passed a single client name to use, and should
935 * use exp_get_by_name() or exp_find().
936 */
937struct svc_export *
938rqst_exp_get_by_name(struct svc_rqst *rqstp, struct path *path)
939{
940 struct svc_export *gssexp, *exp = ERR_PTR(-ENOENT);
941
942 if (rqstp->rq_client == NULL)
943 goto gss;
944
945 /* First try the auth_unix client: */
946 exp = exp_get_by_name(rqstp->rq_client, path, &rqstp->rq_chandle);
947 if (PTR_ERR(exp) == -ENOENT)
948 goto gss;
949 if (IS_ERR(exp))
950 return exp;
951 /* If it has secinfo, assume there are no gss/... clients */
952 if (exp->ex_nflavors > 0)
953 return exp;
954gss:
955 /* Otherwise, try falling back on gss client */
956 if (rqstp->rq_gssclient == NULL)
957 return exp;
958 gssexp = exp_get_by_name(rqstp->rq_gssclient, path, &rqstp->rq_chandle);
959 if (PTR_ERR(gssexp) == -ENOENT)
960 return exp;
961 if (!IS_ERR(exp))
962 exp_put(exp);
963 return gssexp;
964}
965
966struct svc_export *
967rqst_exp_find(struct svc_rqst *rqstp, int fsid_type, u32 *fsidv)
968{
969 struct svc_export *gssexp, *exp = ERR_PTR(-ENOENT);
970
971 if (rqstp->rq_client == NULL)
972 goto gss;
973
974 /* First try the auth_unix client: */
975 exp = exp_find(rqstp->rq_client, fsid_type, fsidv, &rqstp->rq_chandle);
976 if (PTR_ERR(exp) == -ENOENT)
977 goto gss;
978 if (IS_ERR(exp))
979 return exp;
980 /* If it has secinfo, assume there are no gss/... clients */
981 if (exp->ex_nflavors > 0)
982 return exp;
983gss:
984 /* Otherwise, try falling back on gss client */
985 if (rqstp->rq_gssclient == NULL)
986 return exp;
987 gssexp = exp_find(rqstp->rq_gssclient, fsid_type, fsidv,
988 &rqstp->rq_chandle);
989 if (PTR_ERR(gssexp) == -ENOENT)
990 return exp;
991 if (!IS_ERR(exp))
992 exp_put(exp);
993 return gssexp;
994}
995
996struct svc_export *
997rqst_exp_parent(struct svc_rqst *rqstp, struct path *path)
998{
999 struct dentry *saved = dget(path->dentry);
1000 struct svc_export *exp = rqst_exp_get_by_name(rqstp, path);
1001
1002 while (PTR_ERR(exp) == -ENOENT && !IS_ROOT(path->dentry)) {
1003 struct dentry *parent = dget_parent(path->dentry);
1004 dput(path->dentry);
1005 path->dentry = parent;
1006 exp = rqst_exp_get_by_name(rqstp, path);
1007 }
1008 dput(path->dentry);
1009 path->dentry = saved;
1010 return exp;
1011}
1012
1013static struct svc_export *find_fsidzero_export(struct svc_rqst *rqstp)
1014{
1015 u32 fsidv[2];
1016
1017 mk_fsid(FSID_NUM, fsidv, 0, 0, 0, NULL);
1018
1019 return rqst_exp_find(rqstp, FSID_NUM, fsidv);
1020}
1021
1022/*
1023 * Called when we need the filehandle for the root of the pseudofs,
1024 * for a given NFSv4 client. The root is defined to be the
1025 * export point with fsid==0
1026 */
1027__be32
1028exp_pseudoroot(struct svc_rqst *rqstp, struct svc_fh *fhp)
1029{
1030 struct svc_export *exp;
1031 __be32 rv;
1032
1033 exp = find_fsidzero_export(rqstp);
1034 if (IS_ERR(exp))
1035 return nfserrno(PTR_ERR(exp));
1036 rv = fh_compose(fhp, exp, exp->ex_path.dentry, NULL);
1037 exp_put(exp);
1038 return rv;
1039}
1040
1041/* Iterator */
1042
1043static void *e_start(struct seq_file *m, loff_t *pos)
1044 __acquires(svc_export_cache.hash_lock)
1045{
1046 loff_t n = *pos;
1047 unsigned hash, export;
1048 struct cache_head *ch;
1049
1050 read_lock(&svc_export_cache.hash_lock);
1051 if (!n--)
1052 return SEQ_START_TOKEN;
1053 hash = n >> 32;
1054 export = n & ((1LL<<32) - 1);
1055
1056
1057 for (ch=export_table[hash]; ch; ch=ch->next)
1058 if (!export--)
1059 return ch;
1060 n &= ~((1LL<<32) - 1);
1061 do {
1062 hash++;
1063 n += 1LL<<32;
1064 } while(hash < EXPORT_HASHMAX && export_table[hash]==NULL);
1065 if (hash >= EXPORT_HASHMAX)
1066 return NULL;
1067 *pos = n+1;
1068 return export_table[hash];
1069}
1070
1071static void *e_next(struct seq_file *m, void *p, loff_t *pos)
1072{
1073 struct cache_head *ch = p;
1074 int hash = (*pos >> 32);
1075
1076 if (p == SEQ_START_TOKEN)
1077 hash = 0;
1078 else if (ch->next == NULL) {
1079 hash++;
1080 *pos += 1LL<<32;
1081 } else {
1082 ++*pos;
1083 return ch->next;
1084 }
1085 *pos &= ~((1LL<<32) - 1);
1086 while (hash < EXPORT_HASHMAX && export_table[hash] == NULL) {
1087 hash++;
1088 *pos += 1LL<<32;
1089 }
1090 if (hash >= EXPORT_HASHMAX)
1091 return NULL;
1092 ++*pos;
1093 return export_table[hash];
1094}
1095
1096static void e_stop(struct seq_file *m, void *p)
1097 __releases(svc_export_cache.hash_lock)
1098{
1099 read_unlock(&svc_export_cache.hash_lock);
1100}
1101
1102static struct flags {
1103 int flag;
1104 char *name[2];
1105} expflags[] = {
1106 { NFSEXP_READONLY, {"ro", "rw"}},
1107 { NFSEXP_INSECURE_PORT, {"insecure", ""}},
1108 { NFSEXP_ROOTSQUASH, {"root_squash", "no_root_squash"}},
1109 { NFSEXP_ALLSQUASH, {"all_squash", ""}},
1110 { NFSEXP_ASYNC, {"async", "sync"}},
1111 { NFSEXP_GATHERED_WRITES, {"wdelay", "no_wdelay"}},
1112 { NFSEXP_NOHIDE, {"nohide", ""}},
1113 { NFSEXP_CROSSMOUNT, {"crossmnt", ""}},
1114 { NFSEXP_NOSUBTREECHECK, {"no_subtree_check", ""}},
1115 { NFSEXP_NOAUTHNLM, {"insecure_locks", ""}},
1116 { NFSEXP_V4ROOT, {"v4root", ""}},
1117 { 0, {"", ""}}
1118};
1119
1120static void show_expflags(struct seq_file *m, int flags, int mask)
1121{
1122 struct flags *flg;
1123 int state, first = 0;
1124
1125 for (flg = expflags; flg->flag; flg++) {
1126 if (flg->flag & ~mask)
1127 continue;
1128 state = (flg->flag & flags) ? 0 : 1;
1129 if (*flg->name[state])
1130 seq_printf(m, "%s%s", first++?",":"", flg->name[state]);
1131 }
1132}
1133
1134static void show_secinfo_flags(struct seq_file *m, int flags)
1135{
1136 seq_printf(m, ",");
1137 show_expflags(m, flags, NFSEXP_SECINFO_FLAGS);
1138}
1139
1140static bool secinfo_flags_equal(int f, int g)
1141{
1142 f &= NFSEXP_SECINFO_FLAGS;
1143 g &= NFSEXP_SECINFO_FLAGS;
1144 return f == g;
1145}
1146
1147static int show_secinfo_run(struct seq_file *m, struct exp_flavor_info **fp, struct exp_flavor_info *end)
1148{
1149 int flags;
1150
1151 flags = (*fp)->flags;
1152 seq_printf(m, ",sec=%d", (*fp)->pseudoflavor);
1153 (*fp)++;
1154 while (*fp != end && secinfo_flags_equal(flags, (*fp)->flags)) {
1155 seq_printf(m, ":%d", (*fp)->pseudoflavor);
1156 (*fp)++;
1157 }
1158 return flags;
1159}
1160
1161static void show_secinfo(struct seq_file *m, struct svc_export *exp)
1162{
1163 struct exp_flavor_info *f;
1164 struct exp_flavor_info *end = exp->ex_flavors + exp->ex_nflavors;
1165 int flags;
1166
1167 if (exp->ex_nflavors == 0)
1168 return;
1169 f = exp->ex_flavors;
1170 flags = show_secinfo_run(m, &f, end);
1171 if (!secinfo_flags_equal(flags, exp->ex_flags))
1172 show_secinfo_flags(m, flags);
1173 while (f != end) {
1174 flags = show_secinfo_run(m, &f, end);
1175 show_secinfo_flags(m, flags);
1176 }
1177}
1178
1179static void exp_flags(struct seq_file *m, int flag, int fsid,
1180 uid_t anonu, uid_t anong, struct nfsd4_fs_locations *fsloc)
1181{
1182 show_expflags(m, flag, NFSEXP_ALLFLAGS);
1183 if (flag & NFSEXP_FSID)
1184 seq_printf(m, ",fsid=%d", fsid);
1185 if (anonu != (uid_t)-2 && anonu != (0x10000-2))
1186 seq_printf(m, ",anonuid=%u", anonu);
1187 if (anong != (gid_t)-2 && anong != (0x10000-2))
1188 seq_printf(m, ",anongid=%u", anong);
1189 if (fsloc && fsloc->locations_count > 0) {
1190 char *loctype = (fsloc->migrated) ? "refer" : "replicas";
1191 int i;
1192
1193 seq_printf(m, ",%s=", loctype);
1194 seq_escape(m, fsloc->locations[0].path, ",;@ \t\n\\");
1195 seq_putc(m, '@');
1196 seq_escape(m, fsloc->locations[0].hosts, ",;@ \t\n\\");
1197 for (i = 1; i < fsloc->locations_count; i++) {
1198 seq_putc(m, ';');
1199 seq_escape(m, fsloc->locations[i].path, ",;@ \t\n\\");
1200 seq_putc(m, '@');
1201 seq_escape(m, fsloc->locations[i].hosts, ",;@ \t\n\\");
1202 }
1203 }
1204}
1205
1206static int e_show(struct seq_file *m, void *p)
1207{
1208 struct cache_head *cp = p;
1209 struct svc_export *exp = container_of(cp, struct svc_export, h);
1210
1211 if (p == SEQ_START_TOKEN) {
1212 seq_puts(m, "# Version 1.1\n");
1213 seq_puts(m, "# Path Client(Flags) # IPs\n");
1214 return 0;
1215 }
1216
1217 cache_get(&exp->h);
1218 if (cache_check(&svc_export_cache, &exp->h, NULL))
1219 return 0;
1220 cache_put(&exp->h, &svc_export_cache);
1221 return svc_export_show(m, &svc_export_cache, cp);
1222}
1223
1224const struct seq_operations nfs_exports_op = {
1225 .start = e_start,
1226 .next = e_next,
1227 .stop = e_stop,
1228 .show = e_show,
1229};
1230
1231
1232/*
1233 * Initialize the exports module.
1234 */
1235int
1236nfsd_export_init(void)
1237{
1238 int rv;
1239 dprintk("nfsd: initializing export module.\n");
1240
1241 rv = cache_register(&svc_export_cache);
1242 if (rv)
1243 return rv;
1244 rv = cache_register(&svc_expkey_cache);
1245 if (rv)
1246 cache_unregister(&svc_export_cache);
1247 return rv;
1248
1249}
1250
1251/*
1252 * Flush exports table - called when last nfsd thread is killed
1253 */
1254void
1255nfsd_export_flush(void)
1256{
1257 cache_purge(&svc_expkey_cache);
1258 cache_purge(&svc_export_cache);
1259}
1260
1261/*
1262 * Shutdown the exports module.
1263 */
1264void
1265nfsd_export_shutdown(void)
1266{
1267
1268 dprintk("nfsd: shutting down export module.\n");
1269
1270 cache_unregister(&svc_expkey_cache);
1271 cache_unregister(&svc_export_cache);
1272 svcauth_unix_purge();
1273
1274 dprintk("nfsd: export shutdown complete.\n");
1275}
1/*
2 * NFS exporting and validation.
3 *
4 * We maintain a list of clients, each of which has a list of
5 * exports. To export an fs to a given client, you first have
6 * to create the client entry with NFSCTL_ADDCLIENT, which
7 * creates a client control block and adds it to the hash
8 * table. Then, you call NFSCTL_EXPORT for each fs.
9 *
10 *
11 * Copyright (C) 1995, 1996 Olaf Kirch, <okir@monad.swb.de>
12 */
13
14#include <linux/slab.h>
15#include <linux/namei.h>
16#include <linux/module.h>
17#include <linux/exportfs.h>
18#include <linux/sunrpc/svc_xprt.h>
19
20#include "nfsd.h"
21#include "nfsfh.h"
22#include "netns.h"
23#include "pnfs.h"
24
25#define NFSDDBG_FACILITY NFSDDBG_EXPORT
26
27/*
28 * We have two caches.
29 * One maps client+vfsmnt+dentry to export options - the export map
30 * The other maps client+filehandle-fragment to export options. - the expkey map
31 *
32 * The export options are actually stored in the first map, and the
33 * second map contains a reference to the entry in the first map.
34 */
35
36#define EXPKEY_HASHBITS 8
37#define EXPKEY_HASHMAX (1 << EXPKEY_HASHBITS)
38#define EXPKEY_HASHMASK (EXPKEY_HASHMAX -1)
39
40static void expkey_put(struct kref *ref)
41{
42 struct svc_expkey *key = container_of(ref, struct svc_expkey, h.ref);
43
44 if (test_bit(CACHE_VALID, &key->h.flags) &&
45 !test_bit(CACHE_NEGATIVE, &key->h.flags))
46 path_put(&key->ek_path);
47 auth_domain_put(key->ek_client);
48 kfree(key);
49}
50
51static void expkey_request(struct cache_detail *cd,
52 struct cache_head *h,
53 char **bpp, int *blen)
54{
55 /* client fsidtype \xfsid */
56 struct svc_expkey *ek = container_of(h, struct svc_expkey, h);
57 char type[5];
58
59 qword_add(bpp, blen, ek->ek_client->name);
60 snprintf(type, 5, "%d", ek->ek_fsidtype);
61 qword_add(bpp, blen, type);
62 qword_addhex(bpp, blen, (char*)ek->ek_fsid, key_len(ek->ek_fsidtype));
63 (*bpp)[-1] = '\n';
64}
65
66static struct svc_expkey *svc_expkey_update(struct cache_detail *cd, struct svc_expkey *new,
67 struct svc_expkey *old);
68static struct svc_expkey *svc_expkey_lookup(struct cache_detail *cd, struct svc_expkey *);
69
70static int expkey_parse(struct cache_detail *cd, char *mesg, int mlen)
71{
72 /* client fsidtype fsid expiry [path] */
73 char *buf;
74 int len;
75 struct auth_domain *dom = NULL;
76 int err;
77 int fsidtype;
78 char *ep;
79 struct svc_expkey key;
80 struct svc_expkey *ek = NULL;
81
82 if (mesg[mlen - 1] != '\n')
83 return -EINVAL;
84 mesg[mlen-1] = 0;
85
86 buf = kmalloc(PAGE_SIZE, GFP_KERNEL);
87 err = -ENOMEM;
88 if (!buf)
89 goto out;
90
91 err = -EINVAL;
92 if ((len=qword_get(&mesg, buf, PAGE_SIZE)) <= 0)
93 goto out;
94
95 err = -ENOENT;
96 dom = auth_domain_find(buf);
97 if (!dom)
98 goto out;
99 dprintk("found domain %s\n", buf);
100
101 err = -EINVAL;
102 if ((len=qword_get(&mesg, buf, PAGE_SIZE)) <= 0)
103 goto out;
104 fsidtype = simple_strtoul(buf, &ep, 10);
105 if (*ep)
106 goto out;
107 dprintk("found fsidtype %d\n", fsidtype);
108 if (key_len(fsidtype)==0) /* invalid type */
109 goto out;
110 if ((len=qword_get(&mesg, buf, PAGE_SIZE)) <= 0)
111 goto out;
112 dprintk("found fsid length %d\n", len);
113 if (len != key_len(fsidtype))
114 goto out;
115
116 /* OK, we seem to have a valid key */
117 key.h.flags = 0;
118 key.h.expiry_time = get_expiry(&mesg);
119 if (key.h.expiry_time == 0)
120 goto out;
121
122 key.ek_client = dom;
123 key.ek_fsidtype = fsidtype;
124 memcpy(key.ek_fsid, buf, len);
125
126 ek = svc_expkey_lookup(cd, &key);
127 err = -ENOMEM;
128 if (!ek)
129 goto out;
130
131 /* now we want a pathname, or empty meaning NEGATIVE */
132 err = -EINVAL;
133 len = qword_get(&mesg, buf, PAGE_SIZE);
134 if (len < 0)
135 goto out;
136 dprintk("Path seems to be <%s>\n", buf);
137 err = 0;
138 if (len == 0) {
139 set_bit(CACHE_NEGATIVE, &key.h.flags);
140 ek = svc_expkey_update(cd, &key, ek);
141 if (!ek)
142 err = -ENOMEM;
143 } else {
144 err = kern_path(buf, 0, &key.ek_path);
145 if (err)
146 goto out;
147
148 dprintk("Found the path %s\n", buf);
149
150 ek = svc_expkey_update(cd, &key, ek);
151 if (!ek)
152 err = -ENOMEM;
153 path_put(&key.ek_path);
154 }
155 cache_flush();
156 out:
157 if (ek)
158 cache_put(&ek->h, cd);
159 if (dom)
160 auth_domain_put(dom);
161 kfree(buf);
162 return err;
163}
164
165static int expkey_show(struct seq_file *m,
166 struct cache_detail *cd,
167 struct cache_head *h)
168{
169 struct svc_expkey *ek ;
170 int i;
171
172 if (h ==NULL) {
173 seq_puts(m, "#domain fsidtype fsid [path]\n");
174 return 0;
175 }
176 ek = container_of(h, struct svc_expkey, h);
177 seq_printf(m, "%s %d 0x", ek->ek_client->name,
178 ek->ek_fsidtype);
179 for (i=0; i < key_len(ek->ek_fsidtype)/4; i++)
180 seq_printf(m, "%08x", ek->ek_fsid[i]);
181 if (test_bit(CACHE_VALID, &h->flags) &&
182 !test_bit(CACHE_NEGATIVE, &h->flags)) {
183 seq_printf(m, " ");
184 seq_path(m, &ek->ek_path, "\\ \t\n");
185 }
186 seq_printf(m, "\n");
187 return 0;
188}
189
190static inline int expkey_match (struct cache_head *a, struct cache_head *b)
191{
192 struct svc_expkey *orig = container_of(a, struct svc_expkey, h);
193 struct svc_expkey *new = container_of(b, struct svc_expkey, h);
194
195 if (orig->ek_fsidtype != new->ek_fsidtype ||
196 orig->ek_client != new->ek_client ||
197 memcmp(orig->ek_fsid, new->ek_fsid, key_len(orig->ek_fsidtype)) != 0)
198 return 0;
199 return 1;
200}
201
202static inline void expkey_init(struct cache_head *cnew,
203 struct cache_head *citem)
204{
205 struct svc_expkey *new = container_of(cnew, struct svc_expkey, h);
206 struct svc_expkey *item = container_of(citem, struct svc_expkey, h);
207
208 kref_get(&item->ek_client->ref);
209 new->ek_client = item->ek_client;
210 new->ek_fsidtype = item->ek_fsidtype;
211
212 memcpy(new->ek_fsid, item->ek_fsid, sizeof(new->ek_fsid));
213}
214
215static inline void expkey_update(struct cache_head *cnew,
216 struct cache_head *citem)
217{
218 struct svc_expkey *new = container_of(cnew, struct svc_expkey, h);
219 struct svc_expkey *item = container_of(citem, struct svc_expkey, h);
220
221 new->ek_path = item->ek_path;
222 path_get(&item->ek_path);
223}
224
225static struct cache_head *expkey_alloc(void)
226{
227 struct svc_expkey *i = kmalloc(sizeof(*i), GFP_KERNEL);
228 if (i)
229 return &i->h;
230 else
231 return NULL;
232}
233
234static struct cache_detail svc_expkey_cache_template = {
235 .owner = THIS_MODULE,
236 .hash_size = EXPKEY_HASHMAX,
237 .name = "nfsd.fh",
238 .cache_put = expkey_put,
239 .cache_request = expkey_request,
240 .cache_parse = expkey_parse,
241 .cache_show = expkey_show,
242 .match = expkey_match,
243 .init = expkey_init,
244 .update = expkey_update,
245 .alloc = expkey_alloc,
246};
247
248static int
249svc_expkey_hash(struct svc_expkey *item)
250{
251 int hash = item->ek_fsidtype;
252 char * cp = (char*)item->ek_fsid;
253 int len = key_len(item->ek_fsidtype);
254
255 hash ^= hash_mem(cp, len, EXPKEY_HASHBITS);
256 hash ^= hash_ptr(item->ek_client, EXPKEY_HASHBITS);
257 hash &= EXPKEY_HASHMASK;
258 return hash;
259}
260
261static struct svc_expkey *
262svc_expkey_lookup(struct cache_detail *cd, struct svc_expkey *item)
263{
264 struct cache_head *ch;
265 int hash = svc_expkey_hash(item);
266
267 ch = sunrpc_cache_lookup(cd, &item->h, hash);
268 if (ch)
269 return container_of(ch, struct svc_expkey, h);
270 else
271 return NULL;
272}
273
274static struct svc_expkey *
275svc_expkey_update(struct cache_detail *cd, struct svc_expkey *new,
276 struct svc_expkey *old)
277{
278 struct cache_head *ch;
279 int hash = svc_expkey_hash(new);
280
281 ch = sunrpc_cache_update(cd, &new->h, &old->h, hash);
282 if (ch)
283 return container_of(ch, struct svc_expkey, h);
284 else
285 return NULL;
286}
287
288
289#define EXPORT_HASHBITS 8
290#define EXPORT_HASHMAX (1<< EXPORT_HASHBITS)
291
292static void nfsd4_fslocs_free(struct nfsd4_fs_locations *fsloc)
293{
294 struct nfsd4_fs_location *locations = fsloc->locations;
295 int i;
296
297 if (!locations)
298 return;
299
300 for (i = 0; i < fsloc->locations_count; i++) {
301 kfree(locations[i].path);
302 kfree(locations[i].hosts);
303 }
304
305 kfree(locations);
306 fsloc->locations = NULL;
307}
308
309static void svc_export_put(struct kref *ref)
310{
311 struct svc_export *exp = container_of(ref, struct svc_export, h.ref);
312 path_put(&exp->ex_path);
313 auth_domain_put(exp->ex_client);
314 nfsd4_fslocs_free(&exp->ex_fslocs);
315 kfree(exp->ex_uuid);
316 kfree(exp);
317}
318
319static void svc_export_request(struct cache_detail *cd,
320 struct cache_head *h,
321 char **bpp, int *blen)
322{
323 /* client path */
324 struct svc_export *exp = container_of(h, struct svc_export, h);
325 char *pth;
326
327 qword_add(bpp, blen, exp->ex_client->name);
328 pth = d_path(&exp->ex_path, *bpp, *blen);
329 if (IS_ERR(pth)) {
330 /* is this correct? */
331 (*bpp)[0] = '\n';
332 return;
333 }
334 qword_add(bpp, blen, pth);
335 (*bpp)[-1] = '\n';
336}
337
338static struct svc_export *svc_export_update(struct svc_export *new,
339 struct svc_export *old);
340static struct svc_export *svc_export_lookup(struct svc_export *);
341
342static int check_export(struct inode *inode, int *flags, unsigned char *uuid)
343{
344
345 /*
346 * We currently export only dirs, regular files, and (for v4
347 * pseudoroot) symlinks.
348 */
349 if (!S_ISDIR(inode->i_mode) &&
350 !S_ISLNK(inode->i_mode) &&
351 !S_ISREG(inode->i_mode))
352 return -ENOTDIR;
353
354 /*
355 * Mountd should never pass down a writeable V4ROOT export, but,
356 * just to make sure:
357 */
358 if (*flags & NFSEXP_V4ROOT)
359 *flags |= NFSEXP_READONLY;
360
361 /* There are two requirements on a filesystem to be exportable.
362 * 1: We must be able to identify the filesystem from a number.
363 * either a device number (so FS_REQUIRES_DEV needed)
364 * or an FSID number (so NFSEXP_FSID or ->uuid is needed).
365 * 2: We must be able to find an inode from a filehandle.
366 * This means that s_export_op must be set.
367 */
368 if (!(inode->i_sb->s_type->fs_flags & FS_REQUIRES_DEV) &&
369 !(*flags & NFSEXP_FSID) &&
370 uuid == NULL) {
371 dprintk("exp_export: export of non-dev fs without fsid\n");
372 return -EINVAL;
373 }
374
375 if (!inode->i_sb->s_export_op ||
376 !inode->i_sb->s_export_op->fh_to_dentry) {
377 dprintk("exp_export: export of invalid fs type.\n");
378 return -EINVAL;
379 }
380
381 return 0;
382
383}
384
385#ifdef CONFIG_NFSD_V4
386
387static int
388fsloc_parse(char **mesg, char *buf, struct nfsd4_fs_locations *fsloc)
389{
390 int len;
391 int migrated, i, err;
392
393 /* more than one fsloc */
394 if (fsloc->locations)
395 return -EINVAL;
396
397 /* listsize */
398 err = get_uint(mesg, &fsloc->locations_count);
399 if (err)
400 return err;
401 if (fsloc->locations_count > MAX_FS_LOCATIONS)
402 return -EINVAL;
403 if (fsloc->locations_count == 0)
404 return 0;
405
406 fsloc->locations = kzalloc(fsloc->locations_count
407 * sizeof(struct nfsd4_fs_location), GFP_KERNEL);
408 if (!fsloc->locations)
409 return -ENOMEM;
410 for (i=0; i < fsloc->locations_count; i++) {
411 /* colon separated host list */
412 err = -EINVAL;
413 len = qword_get(mesg, buf, PAGE_SIZE);
414 if (len <= 0)
415 goto out_free_all;
416 err = -ENOMEM;
417 fsloc->locations[i].hosts = kstrdup(buf, GFP_KERNEL);
418 if (!fsloc->locations[i].hosts)
419 goto out_free_all;
420 err = -EINVAL;
421 /* slash separated path component list */
422 len = qword_get(mesg, buf, PAGE_SIZE);
423 if (len <= 0)
424 goto out_free_all;
425 err = -ENOMEM;
426 fsloc->locations[i].path = kstrdup(buf, GFP_KERNEL);
427 if (!fsloc->locations[i].path)
428 goto out_free_all;
429 }
430 /* migrated */
431 err = get_int(mesg, &migrated);
432 if (err)
433 goto out_free_all;
434 err = -EINVAL;
435 if (migrated < 0 || migrated > 1)
436 goto out_free_all;
437 fsloc->migrated = migrated;
438 return 0;
439out_free_all:
440 nfsd4_fslocs_free(fsloc);
441 return err;
442}
443
444static int secinfo_parse(char **mesg, char *buf, struct svc_export *exp)
445{
446 struct exp_flavor_info *f;
447 u32 listsize;
448 int err;
449
450 /* more than one secinfo */
451 if (exp->ex_nflavors)
452 return -EINVAL;
453
454 err = get_uint(mesg, &listsize);
455 if (err)
456 return err;
457 if (listsize > MAX_SECINFO_LIST)
458 return -EINVAL;
459
460 for (f = exp->ex_flavors; f < exp->ex_flavors + listsize; f++) {
461 err = get_uint(mesg, &f->pseudoflavor);
462 if (err)
463 return err;
464 /*
465 * XXX: It would be nice to also check whether this
466 * pseudoflavor is supported, so we can discover the
467 * problem at export time instead of when a client fails
468 * to authenticate.
469 */
470 err = get_uint(mesg, &f->flags);
471 if (err)
472 return err;
473 /* Only some flags are allowed to differ between flavors: */
474 if (~NFSEXP_SECINFO_FLAGS & (f->flags ^ exp->ex_flags))
475 return -EINVAL;
476 }
477 exp->ex_nflavors = listsize;
478 return 0;
479}
480
481#else /* CONFIG_NFSD_V4 */
482static inline int
483fsloc_parse(char **mesg, char *buf, struct nfsd4_fs_locations *fsloc){return 0;}
484static inline int
485secinfo_parse(char **mesg, char *buf, struct svc_export *exp) { return 0; }
486#endif
487
488static inline int
489uuid_parse(char **mesg, char *buf, unsigned char **puuid)
490{
491 int len;
492
493 /* more than one uuid */
494 if (*puuid)
495 return -EINVAL;
496
497 /* expect a 16 byte uuid encoded as \xXXXX... */
498 len = qword_get(mesg, buf, PAGE_SIZE);
499 if (len != EX_UUID_LEN)
500 return -EINVAL;
501
502 *puuid = kmemdup(buf, EX_UUID_LEN, GFP_KERNEL);
503 if (*puuid == NULL)
504 return -ENOMEM;
505
506 return 0;
507}
508
509static int svc_export_parse(struct cache_detail *cd, char *mesg, int mlen)
510{
511 /* client path expiry [flags anonuid anongid fsid] */
512 char *buf;
513 int len;
514 int err;
515 struct auth_domain *dom = NULL;
516 struct svc_export exp = {}, *expp;
517 int an_int;
518
519 if (mesg[mlen-1] != '\n')
520 return -EINVAL;
521 mesg[mlen-1] = 0;
522
523 buf = kmalloc(PAGE_SIZE, GFP_KERNEL);
524 if (!buf)
525 return -ENOMEM;
526
527 /* client */
528 err = -EINVAL;
529 len = qword_get(&mesg, buf, PAGE_SIZE);
530 if (len <= 0)
531 goto out;
532
533 err = -ENOENT;
534 dom = auth_domain_find(buf);
535 if (!dom)
536 goto out;
537
538 /* path */
539 err = -EINVAL;
540 if ((len = qword_get(&mesg, buf, PAGE_SIZE)) <= 0)
541 goto out1;
542
543 err = kern_path(buf, 0, &exp.ex_path);
544 if (err)
545 goto out1;
546
547 exp.ex_client = dom;
548 exp.cd = cd;
549 exp.ex_devid_map = NULL;
550
551 /* expiry */
552 err = -EINVAL;
553 exp.h.expiry_time = get_expiry(&mesg);
554 if (exp.h.expiry_time == 0)
555 goto out3;
556
557 /* flags */
558 err = get_int(&mesg, &an_int);
559 if (err == -ENOENT) {
560 err = 0;
561 set_bit(CACHE_NEGATIVE, &exp.h.flags);
562 } else {
563 if (err || an_int < 0)
564 goto out3;
565 exp.ex_flags= an_int;
566
567 /* anon uid */
568 err = get_int(&mesg, &an_int);
569 if (err)
570 goto out3;
571 exp.ex_anon_uid= make_kuid(&init_user_ns, an_int);
572
573 /* anon gid */
574 err = get_int(&mesg, &an_int);
575 if (err)
576 goto out3;
577 exp.ex_anon_gid= make_kgid(&init_user_ns, an_int);
578
579 /* fsid */
580 err = get_int(&mesg, &an_int);
581 if (err)
582 goto out3;
583 exp.ex_fsid = an_int;
584
585 while ((len = qword_get(&mesg, buf, PAGE_SIZE)) > 0) {
586 if (strcmp(buf, "fsloc") == 0)
587 err = fsloc_parse(&mesg, buf, &exp.ex_fslocs);
588 else if (strcmp(buf, "uuid") == 0)
589 err = uuid_parse(&mesg, buf, &exp.ex_uuid);
590 else if (strcmp(buf, "secinfo") == 0)
591 err = secinfo_parse(&mesg, buf, &exp);
592 else
593 /* quietly ignore unknown words and anything
594 * following. Newer user-space can try to set
595 * new values, then see what the result was.
596 */
597 break;
598 if (err)
599 goto out4;
600 }
601
602 err = check_export(d_inode(exp.ex_path.dentry), &exp.ex_flags,
603 exp.ex_uuid);
604 if (err)
605 goto out4;
606 /*
607 * No point caching this if it would immediately expire.
608 * Also, this protects exportfs's dummy export from the
609 * anon_uid/anon_gid checks:
610 */
611 if (exp.h.expiry_time < seconds_since_boot())
612 goto out4;
613 /*
614 * For some reason exportfs has been passing down an
615 * invalid (-1) uid & gid on the "dummy" export which it
616 * uses to test export support. To make sure exportfs
617 * sees errors from check_export we therefore need to
618 * delay these checks till after check_export:
619 */
620 err = -EINVAL;
621 if (!uid_valid(exp.ex_anon_uid))
622 goto out4;
623 if (!gid_valid(exp.ex_anon_gid))
624 goto out4;
625 err = 0;
626
627 nfsd4_setup_layout_type(&exp);
628 }
629
630 expp = svc_export_lookup(&exp);
631 if (expp)
632 expp = svc_export_update(&exp, expp);
633 else
634 err = -ENOMEM;
635 cache_flush();
636 if (expp == NULL)
637 err = -ENOMEM;
638 else
639 exp_put(expp);
640out4:
641 nfsd4_fslocs_free(&exp.ex_fslocs);
642 kfree(exp.ex_uuid);
643out3:
644 path_put(&exp.ex_path);
645out1:
646 auth_domain_put(dom);
647out:
648 kfree(buf);
649 return err;
650}
651
652static void exp_flags(struct seq_file *m, int flag, int fsid,
653 kuid_t anonu, kgid_t anong, struct nfsd4_fs_locations *fslocs);
654static void show_secinfo(struct seq_file *m, struct svc_export *exp);
655
656static int svc_export_show(struct seq_file *m,
657 struct cache_detail *cd,
658 struct cache_head *h)
659{
660 struct svc_export *exp ;
661
662 if (h ==NULL) {
663 seq_puts(m, "#path domain(flags)\n");
664 return 0;
665 }
666 exp = container_of(h, struct svc_export, h);
667 seq_path(m, &exp->ex_path, " \t\n\\");
668 seq_putc(m, '\t');
669 seq_escape(m, exp->ex_client->name, " \t\n\\");
670 seq_putc(m, '(');
671 if (test_bit(CACHE_VALID, &h->flags) &&
672 !test_bit(CACHE_NEGATIVE, &h->flags)) {
673 exp_flags(m, exp->ex_flags, exp->ex_fsid,
674 exp->ex_anon_uid, exp->ex_anon_gid, &exp->ex_fslocs);
675 if (exp->ex_uuid) {
676 int i;
677 seq_puts(m, ",uuid=");
678 for (i = 0; i < EX_UUID_LEN; i++) {
679 if ((i&3) == 0 && i)
680 seq_putc(m, ':');
681 seq_printf(m, "%02x", exp->ex_uuid[i]);
682 }
683 }
684 show_secinfo(m, exp);
685 }
686 seq_puts(m, ")\n");
687 return 0;
688}
689static int svc_export_match(struct cache_head *a, struct cache_head *b)
690{
691 struct svc_export *orig = container_of(a, struct svc_export, h);
692 struct svc_export *new = container_of(b, struct svc_export, h);
693 return orig->ex_client == new->ex_client &&
694 path_equal(&orig->ex_path, &new->ex_path);
695}
696
697static void svc_export_init(struct cache_head *cnew, struct cache_head *citem)
698{
699 struct svc_export *new = container_of(cnew, struct svc_export, h);
700 struct svc_export *item = container_of(citem, struct svc_export, h);
701
702 kref_get(&item->ex_client->ref);
703 new->ex_client = item->ex_client;
704 new->ex_path = item->ex_path;
705 path_get(&item->ex_path);
706 new->ex_fslocs.locations = NULL;
707 new->ex_fslocs.locations_count = 0;
708 new->ex_fslocs.migrated = 0;
709 new->ex_layout_types = 0;
710 new->ex_uuid = NULL;
711 new->cd = item->cd;
712}
713
714static void export_update(struct cache_head *cnew, struct cache_head *citem)
715{
716 struct svc_export *new = container_of(cnew, struct svc_export, h);
717 struct svc_export *item = container_of(citem, struct svc_export, h);
718 int i;
719
720 new->ex_flags = item->ex_flags;
721 new->ex_anon_uid = item->ex_anon_uid;
722 new->ex_anon_gid = item->ex_anon_gid;
723 new->ex_fsid = item->ex_fsid;
724 new->ex_devid_map = item->ex_devid_map;
725 item->ex_devid_map = NULL;
726 new->ex_uuid = item->ex_uuid;
727 item->ex_uuid = NULL;
728 new->ex_fslocs.locations = item->ex_fslocs.locations;
729 item->ex_fslocs.locations = NULL;
730 new->ex_fslocs.locations_count = item->ex_fslocs.locations_count;
731 item->ex_fslocs.locations_count = 0;
732 new->ex_fslocs.migrated = item->ex_fslocs.migrated;
733 item->ex_fslocs.migrated = 0;
734 new->ex_layout_types = item->ex_layout_types;
735 new->ex_nflavors = item->ex_nflavors;
736 for (i = 0; i < MAX_SECINFO_LIST; i++) {
737 new->ex_flavors[i] = item->ex_flavors[i];
738 }
739}
740
741static struct cache_head *svc_export_alloc(void)
742{
743 struct svc_export *i = kmalloc(sizeof(*i), GFP_KERNEL);
744 if (i)
745 return &i->h;
746 else
747 return NULL;
748}
749
750static struct cache_detail svc_export_cache_template = {
751 .owner = THIS_MODULE,
752 .hash_size = EXPORT_HASHMAX,
753 .name = "nfsd.export",
754 .cache_put = svc_export_put,
755 .cache_request = svc_export_request,
756 .cache_parse = svc_export_parse,
757 .cache_show = svc_export_show,
758 .match = svc_export_match,
759 .init = svc_export_init,
760 .update = export_update,
761 .alloc = svc_export_alloc,
762};
763
764static int
765svc_export_hash(struct svc_export *exp)
766{
767 int hash;
768
769 hash = hash_ptr(exp->ex_client, EXPORT_HASHBITS);
770 hash ^= hash_ptr(exp->ex_path.dentry, EXPORT_HASHBITS);
771 hash ^= hash_ptr(exp->ex_path.mnt, EXPORT_HASHBITS);
772 return hash;
773}
774
775static struct svc_export *
776svc_export_lookup(struct svc_export *exp)
777{
778 struct cache_head *ch;
779 int hash = svc_export_hash(exp);
780
781 ch = sunrpc_cache_lookup(exp->cd, &exp->h, hash);
782 if (ch)
783 return container_of(ch, struct svc_export, h);
784 else
785 return NULL;
786}
787
788static struct svc_export *
789svc_export_update(struct svc_export *new, struct svc_export *old)
790{
791 struct cache_head *ch;
792 int hash = svc_export_hash(old);
793
794 ch = sunrpc_cache_update(old->cd, &new->h, &old->h, hash);
795 if (ch)
796 return container_of(ch, struct svc_export, h);
797 else
798 return NULL;
799}
800
801
802static struct svc_expkey *
803exp_find_key(struct cache_detail *cd, struct auth_domain *clp, int fsid_type,
804 u32 *fsidv, struct cache_req *reqp)
805{
806 struct svc_expkey key, *ek;
807 int err;
808
809 if (!clp)
810 return ERR_PTR(-ENOENT);
811
812 key.ek_client = clp;
813 key.ek_fsidtype = fsid_type;
814 memcpy(key.ek_fsid, fsidv, key_len(fsid_type));
815
816 ek = svc_expkey_lookup(cd, &key);
817 if (ek == NULL)
818 return ERR_PTR(-ENOMEM);
819 err = cache_check(cd, &ek->h, reqp);
820 if (err)
821 return ERR_PTR(err);
822 return ek;
823}
824
825static struct svc_export *
826exp_get_by_name(struct cache_detail *cd, struct auth_domain *clp,
827 const struct path *path, struct cache_req *reqp)
828{
829 struct svc_export *exp, key;
830 int err;
831
832 if (!clp)
833 return ERR_PTR(-ENOENT);
834
835 key.ex_client = clp;
836 key.ex_path = *path;
837 key.cd = cd;
838
839 exp = svc_export_lookup(&key);
840 if (exp == NULL)
841 return ERR_PTR(-ENOMEM);
842 err = cache_check(cd, &exp->h, reqp);
843 if (err)
844 return ERR_PTR(err);
845 return exp;
846}
847
848/*
849 * Find the export entry for a given dentry.
850 */
851static struct svc_export *
852exp_parent(struct cache_detail *cd, struct auth_domain *clp, struct path *path)
853{
854 struct dentry *saved = dget(path->dentry);
855 struct svc_export *exp = exp_get_by_name(cd, clp, path, NULL);
856
857 while (PTR_ERR(exp) == -ENOENT && !IS_ROOT(path->dentry)) {
858 struct dentry *parent = dget_parent(path->dentry);
859 dput(path->dentry);
860 path->dentry = parent;
861 exp = exp_get_by_name(cd, clp, path, NULL);
862 }
863 dput(path->dentry);
864 path->dentry = saved;
865 return exp;
866}
867
868
869
870/*
871 * Obtain the root fh on behalf of a client.
872 * This could be done in user space, but I feel that it adds some safety
873 * since its harder to fool a kernel module than a user space program.
874 */
875int
876exp_rootfh(struct net *net, struct auth_domain *clp, char *name,
877 struct knfsd_fh *f, int maxsize)
878{
879 struct svc_export *exp;
880 struct path path;
881 struct inode *inode;
882 struct svc_fh fh;
883 int err;
884 struct nfsd_net *nn = net_generic(net, nfsd_net_id);
885 struct cache_detail *cd = nn->svc_export_cache;
886
887 err = -EPERM;
888 /* NB: we probably ought to check that it's NUL-terminated */
889 if (kern_path(name, 0, &path)) {
890 printk("nfsd: exp_rootfh path not found %s", name);
891 return err;
892 }
893 inode = d_inode(path.dentry);
894
895 dprintk("nfsd: exp_rootfh(%s [%p] %s:%s/%ld)\n",
896 name, path.dentry, clp->name,
897 inode->i_sb->s_id, inode->i_ino);
898 exp = exp_parent(cd, clp, &path);
899 if (IS_ERR(exp)) {
900 err = PTR_ERR(exp);
901 goto out;
902 }
903
904 /*
905 * fh must be initialized before calling fh_compose
906 */
907 fh_init(&fh, maxsize);
908 if (fh_compose(&fh, exp, path.dentry, NULL))
909 err = -EINVAL;
910 else
911 err = 0;
912 memcpy(f, &fh.fh_handle, sizeof(struct knfsd_fh));
913 fh_put(&fh);
914 exp_put(exp);
915out:
916 path_put(&path);
917 return err;
918}
919
920static struct svc_export *exp_find(struct cache_detail *cd,
921 struct auth_domain *clp, int fsid_type,
922 u32 *fsidv, struct cache_req *reqp)
923{
924 struct svc_export *exp;
925 struct nfsd_net *nn = net_generic(cd->net, nfsd_net_id);
926 struct svc_expkey *ek = exp_find_key(nn->svc_expkey_cache, clp, fsid_type, fsidv, reqp);
927 if (IS_ERR(ek))
928 return ERR_CAST(ek);
929
930 exp = exp_get_by_name(cd, clp, &ek->ek_path, reqp);
931 cache_put(&ek->h, nn->svc_expkey_cache);
932
933 if (IS_ERR(exp))
934 return ERR_CAST(exp);
935 return exp;
936}
937
938__be32 check_nfsd_access(struct svc_export *exp, struct svc_rqst *rqstp)
939{
940 struct exp_flavor_info *f;
941 struct exp_flavor_info *end = exp->ex_flavors + exp->ex_nflavors;
942
943 /* legacy gss-only clients are always OK: */
944 if (exp->ex_client == rqstp->rq_gssclient)
945 return 0;
946 /* ip-address based client; check sec= export option: */
947 for (f = exp->ex_flavors; f < end; f++) {
948 if (f->pseudoflavor == rqstp->rq_cred.cr_flavor)
949 return 0;
950 }
951 /* defaults in absence of sec= options: */
952 if (exp->ex_nflavors == 0) {
953 if (rqstp->rq_cred.cr_flavor == RPC_AUTH_NULL ||
954 rqstp->rq_cred.cr_flavor == RPC_AUTH_UNIX)
955 return 0;
956 }
957
958 /* If the compound op contains a spo_must_allowed op,
959 * it will be sent with integrity/protection which
960 * will have to be expressly allowed on mounts that
961 * don't support it
962 */
963
964 if (nfsd4_spo_must_allow(rqstp))
965 return 0;
966
967 return nfserr_wrongsec;
968}
969
970/*
971 * Uses rq_client and rq_gssclient to find an export; uses rq_client (an
972 * auth_unix client) if it's available and has secinfo information;
973 * otherwise, will try to use rq_gssclient.
974 *
975 * Called from functions that handle requests; functions that do work on
976 * behalf of mountd are passed a single client name to use, and should
977 * use exp_get_by_name() or exp_find().
978 */
979struct svc_export *
980rqst_exp_get_by_name(struct svc_rqst *rqstp, struct path *path)
981{
982 struct svc_export *gssexp, *exp = ERR_PTR(-ENOENT);
983 struct nfsd_net *nn = net_generic(SVC_NET(rqstp), nfsd_net_id);
984 struct cache_detail *cd = nn->svc_export_cache;
985
986 if (rqstp->rq_client == NULL)
987 goto gss;
988
989 /* First try the auth_unix client: */
990 exp = exp_get_by_name(cd, rqstp->rq_client, path, &rqstp->rq_chandle);
991 if (PTR_ERR(exp) == -ENOENT)
992 goto gss;
993 if (IS_ERR(exp))
994 return exp;
995 /* If it has secinfo, assume there are no gss/... clients */
996 if (exp->ex_nflavors > 0)
997 return exp;
998gss:
999 /* Otherwise, try falling back on gss client */
1000 if (rqstp->rq_gssclient == NULL)
1001 return exp;
1002 gssexp = exp_get_by_name(cd, rqstp->rq_gssclient, path, &rqstp->rq_chandle);
1003 if (PTR_ERR(gssexp) == -ENOENT)
1004 return exp;
1005 if (!IS_ERR(exp))
1006 exp_put(exp);
1007 return gssexp;
1008}
1009
1010struct svc_export *
1011rqst_exp_find(struct svc_rqst *rqstp, int fsid_type, u32 *fsidv)
1012{
1013 struct svc_export *gssexp, *exp = ERR_PTR(-ENOENT);
1014 struct nfsd_net *nn = net_generic(SVC_NET(rqstp), nfsd_net_id);
1015 struct cache_detail *cd = nn->svc_export_cache;
1016
1017 if (rqstp->rq_client == NULL)
1018 goto gss;
1019
1020 /* First try the auth_unix client: */
1021 exp = exp_find(cd, rqstp->rq_client, fsid_type,
1022 fsidv, &rqstp->rq_chandle);
1023 if (PTR_ERR(exp) == -ENOENT)
1024 goto gss;
1025 if (IS_ERR(exp))
1026 return exp;
1027 /* If it has secinfo, assume there are no gss/... clients */
1028 if (exp->ex_nflavors > 0)
1029 return exp;
1030gss:
1031 /* Otherwise, try falling back on gss client */
1032 if (rqstp->rq_gssclient == NULL)
1033 return exp;
1034 gssexp = exp_find(cd, rqstp->rq_gssclient, fsid_type, fsidv,
1035 &rqstp->rq_chandle);
1036 if (PTR_ERR(gssexp) == -ENOENT)
1037 return exp;
1038 if (!IS_ERR(exp))
1039 exp_put(exp);
1040 return gssexp;
1041}
1042
1043struct svc_export *
1044rqst_exp_parent(struct svc_rqst *rqstp, struct path *path)
1045{
1046 struct dentry *saved = dget(path->dentry);
1047 struct svc_export *exp = rqst_exp_get_by_name(rqstp, path);
1048
1049 while (PTR_ERR(exp) == -ENOENT && !IS_ROOT(path->dentry)) {
1050 struct dentry *parent = dget_parent(path->dentry);
1051 dput(path->dentry);
1052 path->dentry = parent;
1053 exp = rqst_exp_get_by_name(rqstp, path);
1054 }
1055 dput(path->dentry);
1056 path->dentry = saved;
1057 return exp;
1058}
1059
1060struct svc_export *rqst_find_fsidzero_export(struct svc_rqst *rqstp)
1061{
1062 u32 fsidv[2];
1063
1064 mk_fsid(FSID_NUM, fsidv, 0, 0, 0, NULL);
1065
1066 return rqst_exp_find(rqstp, FSID_NUM, fsidv);
1067}
1068
1069/*
1070 * Called when we need the filehandle for the root of the pseudofs,
1071 * for a given NFSv4 client. The root is defined to be the
1072 * export point with fsid==0
1073 */
1074__be32
1075exp_pseudoroot(struct svc_rqst *rqstp, struct svc_fh *fhp)
1076{
1077 struct svc_export *exp;
1078 __be32 rv;
1079
1080 exp = rqst_find_fsidzero_export(rqstp);
1081 if (IS_ERR(exp))
1082 return nfserrno(PTR_ERR(exp));
1083 rv = fh_compose(fhp, exp, exp->ex_path.dentry, NULL);
1084 exp_put(exp);
1085 return rv;
1086}
1087
1088static struct flags {
1089 int flag;
1090 char *name[2];
1091} expflags[] = {
1092 { NFSEXP_READONLY, {"ro", "rw"}},
1093 { NFSEXP_INSECURE_PORT, {"insecure", ""}},
1094 { NFSEXP_ROOTSQUASH, {"root_squash", "no_root_squash"}},
1095 { NFSEXP_ALLSQUASH, {"all_squash", ""}},
1096 { NFSEXP_ASYNC, {"async", "sync"}},
1097 { NFSEXP_GATHERED_WRITES, {"wdelay", "no_wdelay"}},
1098 { NFSEXP_NOREADDIRPLUS, {"nordirplus", ""}},
1099 { NFSEXP_NOHIDE, {"nohide", ""}},
1100 { NFSEXP_CROSSMOUNT, {"crossmnt", ""}},
1101 { NFSEXP_NOSUBTREECHECK, {"no_subtree_check", ""}},
1102 { NFSEXP_NOAUTHNLM, {"insecure_locks", ""}},
1103 { NFSEXP_V4ROOT, {"v4root", ""}},
1104 { NFSEXP_PNFS, {"pnfs", ""}},
1105 { 0, {"", ""}}
1106};
1107
1108static void show_expflags(struct seq_file *m, int flags, int mask)
1109{
1110 struct flags *flg;
1111 int state, first = 0;
1112
1113 for (flg = expflags; flg->flag; flg++) {
1114 if (flg->flag & ~mask)
1115 continue;
1116 state = (flg->flag & flags) ? 0 : 1;
1117 if (*flg->name[state])
1118 seq_printf(m, "%s%s", first++?",":"", flg->name[state]);
1119 }
1120}
1121
1122static void show_secinfo_flags(struct seq_file *m, int flags)
1123{
1124 seq_printf(m, ",");
1125 show_expflags(m, flags, NFSEXP_SECINFO_FLAGS);
1126}
1127
1128static bool secinfo_flags_equal(int f, int g)
1129{
1130 f &= NFSEXP_SECINFO_FLAGS;
1131 g &= NFSEXP_SECINFO_FLAGS;
1132 return f == g;
1133}
1134
1135static int show_secinfo_run(struct seq_file *m, struct exp_flavor_info **fp, struct exp_flavor_info *end)
1136{
1137 int flags;
1138
1139 flags = (*fp)->flags;
1140 seq_printf(m, ",sec=%d", (*fp)->pseudoflavor);
1141 (*fp)++;
1142 while (*fp != end && secinfo_flags_equal(flags, (*fp)->flags)) {
1143 seq_printf(m, ":%d", (*fp)->pseudoflavor);
1144 (*fp)++;
1145 }
1146 return flags;
1147}
1148
1149static void show_secinfo(struct seq_file *m, struct svc_export *exp)
1150{
1151 struct exp_flavor_info *f;
1152 struct exp_flavor_info *end = exp->ex_flavors + exp->ex_nflavors;
1153 int flags;
1154
1155 if (exp->ex_nflavors == 0)
1156 return;
1157 f = exp->ex_flavors;
1158 flags = show_secinfo_run(m, &f, end);
1159 if (!secinfo_flags_equal(flags, exp->ex_flags))
1160 show_secinfo_flags(m, flags);
1161 while (f != end) {
1162 flags = show_secinfo_run(m, &f, end);
1163 show_secinfo_flags(m, flags);
1164 }
1165}
1166
1167static void exp_flags(struct seq_file *m, int flag, int fsid,
1168 kuid_t anonu, kgid_t anong, struct nfsd4_fs_locations *fsloc)
1169{
1170 show_expflags(m, flag, NFSEXP_ALLFLAGS);
1171 if (flag & NFSEXP_FSID)
1172 seq_printf(m, ",fsid=%d", fsid);
1173 if (!uid_eq(anonu, make_kuid(&init_user_ns, (uid_t)-2)) &&
1174 !uid_eq(anonu, make_kuid(&init_user_ns, 0x10000-2)))
1175 seq_printf(m, ",anonuid=%u", from_kuid(&init_user_ns, anonu));
1176 if (!gid_eq(anong, make_kgid(&init_user_ns, (gid_t)-2)) &&
1177 !gid_eq(anong, make_kgid(&init_user_ns, 0x10000-2)))
1178 seq_printf(m, ",anongid=%u", from_kgid(&init_user_ns, anong));
1179 if (fsloc && fsloc->locations_count > 0) {
1180 char *loctype = (fsloc->migrated) ? "refer" : "replicas";
1181 int i;
1182
1183 seq_printf(m, ",%s=", loctype);
1184 seq_escape(m, fsloc->locations[0].path, ",;@ \t\n\\");
1185 seq_putc(m, '@');
1186 seq_escape(m, fsloc->locations[0].hosts, ",;@ \t\n\\");
1187 for (i = 1; i < fsloc->locations_count; i++) {
1188 seq_putc(m, ';');
1189 seq_escape(m, fsloc->locations[i].path, ",;@ \t\n\\");
1190 seq_putc(m, '@');
1191 seq_escape(m, fsloc->locations[i].hosts, ",;@ \t\n\\");
1192 }
1193 }
1194}
1195
1196static int e_show(struct seq_file *m, void *p)
1197{
1198 struct cache_head *cp = p;
1199 struct svc_export *exp = container_of(cp, struct svc_export, h);
1200 struct cache_detail *cd = m->private;
1201
1202 if (p == SEQ_START_TOKEN) {
1203 seq_puts(m, "# Version 1.1\n");
1204 seq_puts(m, "# Path Client(Flags) # IPs\n");
1205 return 0;
1206 }
1207
1208 exp_get(exp);
1209 if (cache_check(cd, &exp->h, NULL))
1210 return 0;
1211 exp_put(exp);
1212 return svc_export_show(m, cd, cp);
1213}
1214
1215const struct seq_operations nfs_exports_op = {
1216 .start = cache_seq_start,
1217 .next = cache_seq_next,
1218 .stop = cache_seq_stop,
1219 .show = e_show,
1220};
1221
1222/*
1223 * Initialize the exports module.
1224 */
1225int
1226nfsd_export_init(struct net *net)
1227{
1228 int rv;
1229 struct nfsd_net *nn = net_generic(net, nfsd_net_id);
1230
1231 dprintk("nfsd: initializing export module (net: %p).\n", net);
1232
1233 nn->svc_export_cache = cache_create_net(&svc_export_cache_template, net);
1234 if (IS_ERR(nn->svc_export_cache))
1235 return PTR_ERR(nn->svc_export_cache);
1236 rv = cache_register_net(nn->svc_export_cache, net);
1237 if (rv)
1238 goto destroy_export_cache;
1239
1240 nn->svc_expkey_cache = cache_create_net(&svc_expkey_cache_template, net);
1241 if (IS_ERR(nn->svc_expkey_cache)) {
1242 rv = PTR_ERR(nn->svc_expkey_cache);
1243 goto unregister_export_cache;
1244 }
1245 rv = cache_register_net(nn->svc_expkey_cache, net);
1246 if (rv)
1247 goto destroy_expkey_cache;
1248 return 0;
1249
1250destroy_expkey_cache:
1251 cache_destroy_net(nn->svc_expkey_cache, net);
1252unregister_export_cache:
1253 cache_unregister_net(nn->svc_export_cache, net);
1254destroy_export_cache:
1255 cache_destroy_net(nn->svc_export_cache, net);
1256 return rv;
1257}
1258
1259/*
1260 * Flush exports table - called when last nfsd thread is killed
1261 */
1262void
1263nfsd_export_flush(struct net *net)
1264{
1265 struct nfsd_net *nn = net_generic(net, nfsd_net_id);
1266
1267 cache_purge(nn->svc_expkey_cache);
1268 cache_purge(nn->svc_export_cache);
1269}
1270
1271/*
1272 * Shutdown the exports module.
1273 */
1274void
1275nfsd_export_shutdown(struct net *net)
1276{
1277 struct nfsd_net *nn = net_generic(net, nfsd_net_id);
1278
1279 dprintk("nfsd: shutting down export module (net: %p).\n", net);
1280
1281 cache_unregister_net(nn->svc_expkey_cache, net);
1282 cache_unregister_net(nn->svc_export_cache, net);
1283 cache_destroy_net(nn->svc_expkey_cache, net);
1284 cache_destroy_net(nn->svc_export_cache, net);
1285 svcauth_unix_purge(net);
1286
1287 dprintk("nfsd: export shutdown complete (net: %p).\n", net);
1288}