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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 <net/ipv6.h>
21
22#include "nfsd.h"
23#include "nfsfh.h"
24#include "netns.h"
25
26#define NFSDDBG_FACILITY NFSDDBG_EXPORT
27
28typedef struct auth_domain svc_client;
29typedef struct svc_export svc_export;
30
31/*
32 * We have two caches.
33 * One maps client+vfsmnt+dentry to export options - the export map
34 * The other maps client+filehandle-fragment to export options. - the expkey map
35 *
36 * The export options are actually stored in the first map, and the
37 * second map contains a reference to the entry in the first map.
38 */
39
40#define EXPKEY_HASHBITS 8
41#define EXPKEY_HASHMAX (1 << EXPKEY_HASHBITS)
42#define EXPKEY_HASHMASK (EXPKEY_HASHMAX -1)
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 struct svc_expkey *svc_expkey_update(struct cache_detail *cd, struct svc_expkey *new,
71 struct svc_expkey *old);
72static struct svc_expkey *svc_expkey_lookup(struct cache_detail *cd, struct svc_expkey *);
73
74static int expkey_parse(struct cache_detail *cd, char *mesg, int mlen)
75{
76 /* client fsidtype fsid [path] */
77 char *buf;
78 int len;
79 struct auth_domain *dom = NULL;
80 int err;
81 int fsidtype;
82 char *ep;
83 struct svc_expkey key;
84 struct svc_expkey *ek = NULL;
85
86 if (mesg[mlen - 1] != '\n')
87 return -EINVAL;
88 mesg[mlen-1] = 0;
89
90 buf = kmalloc(PAGE_SIZE, GFP_KERNEL);
91 err = -ENOMEM;
92 if (!buf)
93 goto out;
94
95 err = -EINVAL;
96 if ((len=qword_get(&mesg, buf, PAGE_SIZE)) <= 0)
97 goto out;
98
99 err = -ENOENT;
100 dom = auth_domain_find(buf);
101 if (!dom)
102 goto out;
103 dprintk("found domain %s\n", buf);
104
105 err = -EINVAL;
106 if ((len=qword_get(&mesg, buf, PAGE_SIZE)) <= 0)
107 goto out;
108 fsidtype = simple_strtoul(buf, &ep, 10);
109 if (*ep)
110 goto out;
111 dprintk("found fsidtype %d\n", fsidtype);
112 if (key_len(fsidtype)==0) /* invalid type */
113 goto out;
114 if ((len=qword_get(&mesg, buf, PAGE_SIZE)) <= 0)
115 goto out;
116 dprintk("found fsid length %d\n", len);
117 if (len != key_len(fsidtype))
118 goto out;
119
120 /* OK, we seem to have a valid key */
121 key.h.flags = 0;
122 key.h.expiry_time = get_expiry(&mesg);
123 if (key.h.expiry_time == 0)
124 goto out;
125
126 key.ek_client = dom;
127 key.ek_fsidtype = fsidtype;
128 memcpy(key.ek_fsid, buf, len);
129
130 ek = svc_expkey_lookup(cd, &key);
131 err = -ENOMEM;
132 if (!ek)
133 goto out;
134
135 /* now we want a pathname, or empty meaning NEGATIVE */
136 err = -EINVAL;
137 len = qword_get(&mesg, buf, PAGE_SIZE);
138 if (len < 0)
139 goto out;
140 dprintk("Path seems to be <%s>\n", buf);
141 err = 0;
142 if (len == 0) {
143 set_bit(CACHE_NEGATIVE, &key.h.flags);
144 ek = svc_expkey_update(cd, &key, ek);
145 if (!ek)
146 err = -ENOMEM;
147 } else {
148 err = kern_path(buf, 0, &key.ek_path);
149 if (err)
150 goto out;
151
152 dprintk("Found the path %s\n", buf);
153
154 ek = svc_expkey_update(cd, &key, ek);
155 if (!ek)
156 err = -ENOMEM;
157 path_put(&key.ek_path);
158 }
159 cache_flush();
160 out:
161 if (ek)
162 cache_put(&ek->h, cd);
163 if (dom)
164 auth_domain_put(dom);
165 kfree(buf);
166 return err;
167}
168
169static int expkey_show(struct seq_file *m,
170 struct cache_detail *cd,
171 struct cache_head *h)
172{
173 struct svc_expkey *ek ;
174 int i;
175
176 if (h ==NULL) {
177 seq_puts(m, "#domain fsidtype fsid [path]\n");
178 return 0;
179 }
180 ek = container_of(h, struct svc_expkey, h);
181 seq_printf(m, "%s %d 0x", ek->ek_client->name,
182 ek->ek_fsidtype);
183 for (i=0; i < key_len(ek->ek_fsidtype)/4; i++)
184 seq_printf(m, "%08x", ek->ek_fsid[i]);
185 if (test_bit(CACHE_VALID, &h->flags) &&
186 !test_bit(CACHE_NEGATIVE, &h->flags)) {
187 seq_printf(m, " ");
188 seq_path(m, &ek->ek_path, "\\ \t\n");
189 }
190 seq_printf(m, "\n");
191 return 0;
192}
193
194static inline int expkey_match (struct cache_head *a, struct cache_head *b)
195{
196 struct svc_expkey *orig = container_of(a, struct svc_expkey, h);
197 struct svc_expkey *new = container_of(b, struct svc_expkey, h);
198
199 if (orig->ek_fsidtype != new->ek_fsidtype ||
200 orig->ek_client != new->ek_client ||
201 memcmp(orig->ek_fsid, new->ek_fsid, key_len(orig->ek_fsidtype)) != 0)
202 return 0;
203 return 1;
204}
205
206static inline void expkey_init(struct cache_head *cnew,
207 struct cache_head *citem)
208{
209 struct svc_expkey *new = container_of(cnew, struct svc_expkey, h);
210 struct svc_expkey *item = container_of(citem, struct svc_expkey, h);
211
212 kref_get(&item->ek_client->ref);
213 new->ek_client = item->ek_client;
214 new->ek_fsidtype = item->ek_fsidtype;
215
216 memcpy(new->ek_fsid, item->ek_fsid, sizeof(new->ek_fsid));
217}
218
219static inline void expkey_update(struct cache_head *cnew,
220 struct cache_head *citem)
221{
222 struct svc_expkey *new = container_of(cnew, struct svc_expkey, h);
223 struct svc_expkey *item = container_of(citem, struct svc_expkey, h);
224
225 new->ek_path = item->ek_path;
226 path_get(&item->ek_path);
227}
228
229static struct cache_head *expkey_alloc(void)
230{
231 struct svc_expkey *i = kmalloc(sizeof(*i), GFP_KERNEL);
232 if (i)
233 return &i->h;
234 else
235 return NULL;
236}
237
238static struct cache_detail svc_expkey_cache_template = {
239 .owner = THIS_MODULE,
240 .hash_size = EXPKEY_HASHMAX,
241 .name = "nfsd.fh",
242 .cache_put = expkey_put,
243 .cache_request = expkey_request,
244 .cache_parse = expkey_parse,
245 .cache_show = expkey_show,
246 .match = expkey_match,
247 .init = expkey_init,
248 .update = expkey_update,
249 .alloc = expkey_alloc,
250};
251
252static int
253svc_expkey_hash(struct svc_expkey *item)
254{
255 int hash = item->ek_fsidtype;
256 char * cp = (char*)item->ek_fsid;
257 int len = key_len(item->ek_fsidtype);
258
259 hash ^= hash_mem(cp, len, EXPKEY_HASHBITS);
260 hash ^= hash_ptr(item->ek_client, EXPKEY_HASHBITS);
261 hash &= EXPKEY_HASHMASK;
262 return hash;
263}
264
265static struct svc_expkey *
266svc_expkey_lookup(struct cache_detail *cd, struct svc_expkey *item)
267{
268 struct cache_head *ch;
269 int hash = svc_expkey_hash(item);
270
271 ch = sunrpc_cache_lookup(cd, &item->h, hash);
272 if (ch)
273 return container_of(ch, struct svc_expkey, h);
274 else
275 return NULL;
276}
277
278static struct svc_expkey *
279svc_expkey_update(struct cache_detail *cd, struct svc_expkey *new,
280 struct svc_expkey *old)
281{
282 struct cache_head *ch;
283 int hash = svc_expkey_hash(new);
284
285 ch = sunrpc_cache_update(cd, &new->h, &old->h, hash);
286 if (ch)
287 return container_of(ch, struct svc_expkey, h);
288 else
289 return NULL;
290}
291
292
293#define EXPORT_HASHBITS 8
294#define EXPORT_HASHMAX (1<< EXPORT_HASHBITS)
295
296static void nfsd4_fslocs_free(struct nfsd4_fs_locations *fsloc)
297{
298 int i;
299
300 for (i = 0; i < fsloc->locations_count; i++) {
301 kfree(fsloc->locations[i].path);
302 kfree(fsloc->locations[i].hosts);
303 }
304 kfree(fsloc->locations);
305}
306
307static void svc_export_put(struct kref *ref)
308{
309 struct svc_export *exp = container_of(ref, struct svc_export, h.ref);
310 path_put(&exp->ex_path);
311 auth_domain_put(exp->ex_client);
312 nfsd4_fslocs_free(&exp->ex_fslocs);
313 kfree(exp->ex_uuid);
314 kfree(exp);
315}
316
317static void svc_export_request(struct cache_detail *cd,
318 struct cache_head *h,
319 char **bpp, int *blen)
320{
321 /* client path */
322 struct svc_export *exp = container_of(h, struct svc_export, h);
323 char *pth;
324
325 qword_add(bpp, blen, exp->ex_client->name);
326 pth = d_path(&exp->ex_path, *bpp, *blen);
327 if (IS_ERR(pth)) {
328 /* is this correct? */
329 (*bpp)[0] = '\n';
330 return;
331 }
332 qword_add(bpp, blen, pth);
333 (*bpp)[-1] = '\n';
334}
335
336static struct svc_export *svc_export_update(struct svc_export *new,
337 struct svc_export *old);
338static struct svc_export *svc_export_lookup(struct svc_export *);
339
340static int check_export(struct inode *inode, int *flags, unsigned char *uuid)
341{
342
343 /*
344 * We currently export only dirs, regular files, and (for v4
345 * pseudoroot) symlinks.
346 */
347 if (!S_ISDIR(inode->i_mode) &&
348 !S_ISLNK(inode->i_mode) &&
349 !S_ISREG(inode->i_mode))
350 return -ENOTDIR;
351
352 /*
353 * Mountd should never pass down a writeable V4ROOT export, but,
354 * just to make sure:
355 */
356 if (*flags & NFSEXP_V4ROOT)
357 *flags |= NFSEXP_READONLY;
358
359 /* There are two requirements on a filesystem to be exportable.
360 * 1: We must be able to identify the filesystem from a number.
361 * either a device number (so FS_REQUIRES_DEV needed)
362 * or an FSID number (so NFSEXP_FSID or ->uuid is needed).
363 * 2: We must be able to find an inode from a filehandle.
364 * This means that s_export_op must be set.
365 */
366 if (!(inode->i_sb->s_type->fs_flags & FS_REQUIRES_DEV) &&
367 !(*flags & NFSEXP_FSID) &&
368 uuid == NULL) {
369 dprintk("exp_export: export of non-dev fs without fsid\n");
370 return -EINVAL;
371 }
372
373 if (!inode->i_sb->s_export_op ||
374 !inode->i_sb->s_export_op->fh_to_dentry) {
375 dprintk("exp_export: export of invalid fs type.\n");
376 return -EINVAL;
377 }
378
379 return 0;
380
381}
382
383#ifdef CONFIG_NFSD_V4
384
385static int
386fsloc_parse(char **mesg, char *buf, struct nfsd4_fs_locations *fsloc)
387{
388 int len;
389 int migrated, i, err;
390
391 /* listsize */
392 err = get_uint(mesg, &fsloc->locations_count);
393 if (err)
394 return err;
395 if (fsloc->locations_count > MAX_FS_LOCATIONS)
396 return -EINVAL;
397 if (fsloc->locations_count == 0)
398 return 0;
399
400 fsloc->locations = kzalloc(fsloc->locations_count
401 * sizeof(struct nfsd4_fs_location), GFP_KERNEL);
402 if (!fsloc->locations)
403 return -ENOMEM;
404 for (i=0; i < fsloc->locations_count; i++) {
405 /* colon separated host list */
406 err = -EINVAL;
407 len = qword_get(mesg, buf, PAGE_SIZE);
408 if (len <= 0)
409 goto out_free_all;
410 err = -ENOMEM;
411 fsloc->locations[i].hosts = kstrdup(buf, GFP_KERNEL);
412 if (!fsloc->locations[i].hosts)
413 goto out_free_all;
414 err = -EINVAL;
415 /* slash separated path component list */
416 len = qword_get(mesg, buf, PAGE_SIZE);
417 if (len <= 0)
418 goto out_free_all;
419 err = -ENOMEM;
420 fsloc->locations[i].path = kstrdup(buf, GFP_KERNEL);
421 if (!fsloc->locations[i].path)
422 goto out_free_all;
423 }
424 /* migrated */
425 err = get_int(mesg, &migrated);
426 if (err)
427 goto out_free_all;
428 err = -EINVAL;
429 if (migrated < 0 || migrated > 1)
430 goto out_free_all;
431 fsloc->migrated = migrated;
432 return 0;
433out_free_all:
434 nfsd4_fslocs_free(fsloc);
435 return err;
436}
437
438static int secinfo_parse(char **mesg, char *buf, struct svc_export *exp)
439{
440 int listsize, err;
441 struct exp_flavor_info *f;
442
443 err = get_int(mesg, &listsize);
444 if (err)
445 return err;
446 if (listsize < 0 || listsize > MAX_SECINFO_LIST)
447 return -EINVAL;
448
449 for (f = exp->ex_flavors; f < exp->ex_flavors + listsize; f++) {
450 err = get_uint(mesg, &f->pseudoflavor);
451 if (err)
452 return err;
453 /*
454 * XXX: It would be nice to also check whether this
455 * pseudoflavor is supported, so we can discover the
456 * problem at export time instead of when a client fails
457 * to authenticate.
458 */
459 err = get_uint(mesg, &f->flags);
460 if (err)
461 return err;
462 /* Only some flags are allowed to differ between flavors: */
463 if (~NFSEXP_SECINFO_FLAGS & (f->flags ^ exp->ex_flags))
464 return -EINVAL;
465 }
466 exp->ex_nflavors = listsize;
467 return 0;
468}
469
470#else /* CONFIG_NFSD_V4 */
471static inline int
472fsloc_parse(char **mesg, char *buf, struct nfsd4_fs_locations *fsloc){return 0;}
473static inline int
474secinfo_parse(char **mesg, char *buf, struct svc_export *exp) { return 0; }
475#endif
476
477static int svc_export_parse(struct cache_detail *cd, char *mesg, int mlen)
478{
479 /* client path expiry [flags anonuid anongid fsid] */
480 char *buf;
481 int len;
482 int err;
483 struct auth_domain *dom = NULL;
484 struct svc_export exp = {}, *expp;
485 int an_int;
486
487 if (mesg[mlen-1] != '\n')
488 return -EINVAL;
489 mesg[mlen-1] = 0;
490
491 buf = kmalloc(PAGE_SIZE, GFP_KERNEL);
492 if (!buf)
493 return -ENOMEM;
494
495 /* client */
496 err = -EINVAL;
497 len = qword_get(&mesg, buf, PAGE_SIZE);
498 if (len <= 0)
499 goto out;
500
501 err = -ENOENT;
502 dom = auth_domain_find(buf);
503 if (!dom)
504 goto out;
505
506 /* path */
507 err = -EINVAL;
508 if ((len = qword_get(&mesg, buf, PAGE_SIZE)) <= 0)
509 goto out1;
510
511 err = kern_path(buf, 0, &exp.ex_path);
512 if (err)
513 goto out1;
514
515 exp.ex_client = dom;
516 exp.cd = cd;
517
518 /* expiry */
519 err = -EINVAL;
520 exp.h.expiry_time = get_expiry(&mesg);
521 if (exp.h.expiry_time == 0)
522 goto out3;
523
524 /* flags */
525 err = get_int(&mesg, &an_int);
526 if (err == -ENOENT) {
527 err = 0;
528 set_bit(CACHE_NEGATIVE, &exp.h.flags);
529 } else {
530 if (err || an_int < 0)
531 goto out3;
532 exp.ex_flags= an_int;
533
534 /* anon uid */
535 err = get_int(&mesg, &an_int);
536 if (err)
537 goto out3;
538 exp.ex_anon_uid= make_kuid(&init_user_ns, an_int);
539
540 /* anon gid */
541 err = get_int(&mesg, &an_int);
542 if (err)
543 goto out3;
544 exp.ex_anon_gid= make_kgid(&init_user_ns, an_int);
545
546 /* fsid */
547 err = get_int(&mesg, &an_int);
548 if (err)
549 goto out3;
550 exp.ex_fsid = an_int;
551
552 while ((len = qword_get(&mesg, buf, PAGE_SIZE)) > 0) {
553 if (strcmp(buf, "fsloc") == 0)
554 err = fsloc_parse(&mesg, buf, &exp.ex_fslocs);
555 else if (strcmp(buf, "uuid") == 0) {
556 /* expect a 16 byte uuid encoded as \xXXXX... */
557 len = qword_get(&mesg, buf, PAGE_SIZE);
558 if (len != 16)
559 err = -EINVAL;
560 else {
561 exp.ex_uuid =
562 kmemdup(buf, 16, GFP_KERNEL);
563 if (exp.ex_uuid == NULL)
564 err = -ENOMEM;
565 }
566 } else if (strcmp(buf, "secinfo") == 0)
567 err = secinfo_parse(&mesg, buf, &exp);
568 else
569 /* quietly ignore unknown words and anything
570 * following. Newer user-space can try to set
571 * new values, then see what the result was.
572 */
573 break;
574 if (err)
575 goto out4;
576 }
577
578 err = check_export(exp.ex_path.dentry->d_inode, &exp.ex_flags,
579 exp.ex_uuid);
580 if (err)
581 goto out4;
582 /*
583 * No point caching this if it would immediately expire.
584 * Also, this protects exportfs's dummy export from the
585 * anon_uid/anon_gid checks:
586 */
587 if (exp.h.expiry_time < seconds_since_boot())
588 goto out4;
589 /*
590 * For some reason exportfs has been passing down an
591 * invalid (-1) uid & gid on the "dummy" export which it
592 * uses to test export support. To make sure exportfs
593 * sees errors from check_export we therefore need to
594 * delay these checks till after check_export:
595 */
596 err = -EINVAL;
597 if (!uid_valid(exp.ex_anon_uid))
598 goto out4;
599 if (!gid_valid(exp.ex_anon_gid))
600 goto out4;
601 err = 0;
602 }
603
604 expp = svc_export_lookup(&exp);
605 if (expp)
606 expp = svc_export_update(&exp, expp);
607 else
608 err = -ENOMEM;
609 cache_flush();
610 if (expp == NULL)
611 err = -ENOMEM;
612 else
613 exp_put(expp);
614out4:
615 nfsd4_fslocs_free(&exp.ex_fslocs);
616 kfree(exp.ex_uuid);
617out3:
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 kuid_t anonu, kgid_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_fslocs.locations = NULL;
682 new->ex_fslocs.locations_count = 0;
683 new->ex_fslocs.migrated = 0;
684 new->ex_uuid = NULL;
685 new->cd = item->cd;
686}
687
688static void export_update(struct cache_head *cnew, struct cache_head *citem)
689{
690 struct svc_export *new = container_of(cnew, struct svc_export, h);
691 struct svc_export *item = container_of(citem, struct svc_export, h);
692 int i;
693
694 new->ex_flags = item->ex_flags;
695 new->ex_anon_uid = item->ex_anon_uid;
696 new->ex_anon_gid = item->ex_anon_gid;
697 new->ex_fsid = item->ex_fsid;
698 new->ex_uuid = item->ex_uuid;
699 item->ex_uuid = NULL;
700 new->ex_fslocs.locations = item->ex_fslocs.locations;
701 item->ex_fslocs.locations = NULL;
702 new->ex_fslocs.locations_count = item->ex_fslocs.locations_count;
703 item->ex_fslocs.locations_count = 0;
704 new->ex_fslocs.migrated = item->ex_fslocs.migrated;
705 item->ex_fslocs.migrated = 0;
706 new->ex_nflavors = item->ex_nflavors;
707 for (i = 0; i < MAX_SECINFO_LIST; i++) {
708 new->ex_flavors[i] = item->ex_flavors[i];
709 }
710}
711
712static struct cache_head *svc_export_alloc(void)
713{
714 struct svc_export *i = kmalloc(sizeof(*i), GFP_KERNEL);
715 if (i)
716 return &i->h;
717 else
718 return NULL;
719}
720
721static struct cache_detail svc_export_cache_template = {
722 .owner = THIS_MODULE,
723 .hash_size = EXPORT_HASHMAX,
724 .name = "nfsd.export",
725 .cache_put = svc_export_put,
726 .cache_request = svc_export_request,
727 .cache_parse = svc_export_parse,
728 .cache_show = svc_export_show,
729 .match = svc_export_match,
730 .init = svc_export_init,
731 .update = export_update,
732 .alloc = svc_export_alloc,
733};
734
735static int
736svc_export_hash(struct svc_export *exp)
737{
738 int hash;
739
740 hash = hash_ptr(exp->ex_client, EXPORT_HASHBITS);
741 hash ^= hash_ptr(exp->ex_path.dentry, EXPORT_HASHBITS);
742 hash ^= hash_ptr(exp->ex_path.mnt, EXPORT_HASHBITS);
743 return hash;
744}
745
746static struct svc_export *
747svc_export_lookup(struct svc_export *exp)
748{
749 struct cache_head *ch;
750 int hash = svc_export_hash(exp);
751
752 ch = sunrpc_cache_lookup(exp->cd, &exp->h, hash);
753 if (ch)
754 return container_of(ch, struct svc_export, h);
755 else
756 return NULL;
757}
758
759static struct svc_export *
760svc_export_update(struct svc_export *new, struct svc_export *old)
761{
762 struct cache_head *ch;
763 int hash = svc_export_hash(old);
764
765 ch = sunrpc_cache_update(old->cd, &new->h, &old->h, hash);
766 if (ch)
767 return container_of(ch, struct svc_export, h);
768 else
769 return NULL;
770}
771
772
773static struct svc_expkey *
774exp_find_key(struct cache_detail *cd, svc_client *clp, int fsid_type,
775 u32 *fsidv, struct cache_req *reqp)
776{
777 struct svc_expkey key, *ek;
778 int err;
779
780 if (!clp)
781 return ERR_PTR(-ENOENT);
782
783 key.ek_client = clp;
784 key.ek_fsidtype = fsid_type;
785 memcpy(key.ek_fsid, fsidv, key_len(fsid_type));
786
787 ek = svc_expkey_lookup(cd, &key);
788 if (ek == NULL)
789 return ERR_PTR(-ENOMEM);
790 err = cache_check(cd, &ek->h, reqp);
791 if (err)
792 return ERR_PTR(err);
793 return ek;
794}
795
796
797static svc_export *exp_get_by_name(struct cache_detail *cd, svc_client *clp,
798 const struct path *path, struct cache_req *reqp)
799{
800 struct svc_export *exp, key;
801 int err;
802
803 if (!clp)
804 return ERR_PTR(-ENOENT);
805
806 key.ex_client = clp;
807 key.ex_path = *path;
808 key.cd = cd;
809
810 exp = svc_export_lookup(&key);
811 if (exp == NULL)
812 return ERR_PTR(-ENOMEM);
813 err = cache_check(cd, &exp->h, reqp);
814 if (err)
815 return ERR_PTR(err);
816 return exp;
817}
818
819/*
820 * Find the export entry for a given dentry.
821 */
822static struct svc_export *exp_parent(struct cache_detail *cd, svc_client *clp,
823 struct path *path)
824{
825 struct dentry *saved = dget(path->dentry);
826 svc_export *exp = exp_get_by_name(cd, clp, path, NULL);
827
828 while (PTR_ERR(exp) == -ENOENT && !IS_ROOT(path->dentry)) {
829 struct dentry *parent = dget_parent(path->dentry);
830 dput(path->dentry);
831 path->dentry = parent;
832 exp = exp_get_by_name(cd, clp, path, NULL);
833 }
834 dput(path->dentry);
835 path->dentry = saved;
836 return exp;
837}
838
839
840
841/*
842 * Obtain the root fh on behalf of a client.
843 * This could be done in user space, but I feel that it adds some safety
844 * since its harder to fool a kernel module than a user space program.
845 */
846int
847exp_rootfh(struct net *net, svc_client *clp, char *name,
848 struct knfsd_fh *f, int maxsize)
849{
850 struct svc_export *exp;
851 struct path path;
852 struct inode *inode;
853 struct svc_fh fh;
854 int err;
855 struct nfsd_net *nn = net_generic(net, nfsd_net_id);
856 struct cache_detail *cd = nn->svc_export_cache;
857
858 err = -EPERM;
859 /* NB: we probably ought to check that it's NUL-terminated */
860 if (kern_path(name, 0, &path)) {
861 printk("nfsd: exp_rootfh path not found %s", name);
862 return err;
863 }
864 inode = path.dentry->d_inode;
865
866 dprintk("nfsd: exp_rootfh(%s [%p] %s:%s/%ld)\n",
867 name, path.dentry, clp->name,
868 inode->i_sb->s_id, inode->i_ino);
869 exp = exp_parent(cd, clp, &path);
870 if (IS_ERR(exp)) {
871 err = PTR_ERR(exp);
872 goto out;
873 }
874
875 /*
876 * fh must be initialized before calling fh_compose
877 */
878 fh_init(&fh, maxsize);
879 if (fh_compose(&fh, exp, path.dentry, NULL))
880 err = -EINVAL;
881 else
882 err = 0;
883 memcpy(f, &fh.fh_handle, sizeof(struct knfsd_fh));
884 fh_put(&fh);
885 exp_put(exp);
886out:
887 path_put(&path);
888 return err;
889}
890
891static struct svc_export *exp_find(struct cache_detail *cd,
892 struct auth_domain *clp, int fsid_type,
893 u32 *fsidv, struct cache_req *reqp)
894{
895 struct svc_export *exp;
896 struct nfsd_net *nn = net_generic(cd->net, nfsd_net_id);
897 struct svc_expkey *ek = exp_find_key(nn->svc_expkey_cache, clp, fsid_type, fsidv, reqp);
898 if (IS_ERR(ek))
899 return ERR_CAST(ek);
900
901 exp = exp_get_by_name(cd, clp, &ek->ek_path, reqp);
902 cache_put(&ek->h, nn->svc_expkey_cache);
903
904 if (IS_ERR(exp))
905 return ERR_CAST(exp);
906 return exp;
907}
908
909__be32 check_nfsd_access(struct svc_export *exp, struct svc_rqst *rqstp)
910{
911 struct exp_flavor_info *f;
912 struct exp_flavor_info *end = exp->ex_flavors + exp->ex_nflavors;
913
914 /* legacy gss-only clients are always OK: */
915 if (exp->ex_client == rqstp->rq_gssclient)
916 return 0;
917 /* ip-address based client; check sec= export option: */
918 for (f = exp->ex_flavors; f < end; f++) {
919 if (f->pseudoflavor == rqstp->rq_cred.cr_flavor)
920 return 0;
921 }
922 /* defaults in absence of sec= options: */
923 if (exp->ex_nflavors == 0) {
924 if (rqstp->rq_cred.cr_flavor == RPC_AUTH_NULL ||
925 rqstp->rq_cred.cr_flavor == RPC_AUTH_UNIX)
926 return 0;
927 }
928 return nfserr_wrongsec;
929}
930
931/*
932 * Uses rq_client and rq_gssclient to find an export; uses rq_client (an
933 * auth_unix client) if it's available and has secinfo information;
934 * otherwise, will try to use rq_gssclient.
935 *
936 * Called from functions that handle requests; functions that do work on
937 * behalf of mountd are passed a single client name to use, and should
938 * use exp_get_by_name() or exp_find().
939 */
940struct svc_export *
941rqst_exp_get_by_name(struct svc_rqst *rqstp, struct path *path)
942{
943 struct svc_export *gssexp, *exp = ERR_PTR(-ENOENT);
944 struct nfsd_net *nn = net_generic(SVC_NET(rqstp), nfsd_net_id);
945 struct cache_detail *cd = nn->svc_export_cache;
946
947 if (rqstp->rq_client == NULL)
948 goto gss;
949
950 /* First try the auth_unix client: */
951 exp = exp_get_by_name(cd, rqstp->rq_client, path, &rqstp->rq_chandle);
952 if (PTR_ERR(exp) == -ENOENT)
953 goto gss;
954 if (IS_ERR(exp))
955 return exp;
956 /* If it has secinfo, assume there are no gss/... clients */
957 if (exp->ex_nflavors > 0)
958 return exp;
959gss:
960 /* Otherwise, try falling back on gss client */
961 if (rqstp->rq_gssclient == NULL)
962 return exp;
963 gssexp = exp_get_by_name(cd, rqstp->rq_gssclient, path, &rqstp->rq_chandle);
964 if (PTR_ERR(gssexp) == -ENOENT)
965 return exp;
966 if (!IS_ERR(exp))
967 exp_put(exp);
968 return gssexp;
969}
970
971struct svc_export *
972rqst_exp_find(struct svc_rqst *rqstp, int fsid_type, u32 *fsidv)
973{
974 struct svc_export *gssexp, *exp = ERR_PTR(-ENOENT);
975 struct nfsd_net *nn = net_generic(SVC_NET(rqstp), nfsd_net_id);
976 struct cache_detail *cd = nn->svc_export_cache;
977
978 if (rqstp->rq_client == NULL)
979 goto gss;
980
981 /* First try the auth_unix client: */
982 exp = exp_find(cd, rqstp->rq_client, fsid_type,
983 fsidv, &rqstp->rq_chandle);
984 if (PTR_ERR(exp) == -ENOENT)
985 goto gss;
986 if (IS_ERR(exp))
987 return exp;
988 /* If it has secinfo, assume there are no gss/... clients */
989 if (exp->ex_nflavors > 0)
990 return exp;
991gss:
992 /* Otherwise, try falling back on gss client */
993 if (rqstp->rq_gssclient == NULL)
994 return exp;
995 gssexp = exp_find(cd, rqstp->rq_gssclient, fsid_type, fsidv,
996 &rqstp->rq_chandle);
997 if (PTR_ERR(gssexp) == -ENOENT)
998 return exp;
999 if (!IS_ERR(exp))
1000 exp_put(exp);
1001 return gssexp;
1002}
1003
1004struct svc_export *
1005rqst_exp_parent(struct svc_rqst *rqstp, struct path *path)
1006{
1007 struct dentry *saved = dget(path->dentry);
1008 struct svc_export *exp = rqst_exp_get_by_name(rqstp, path);
1009
1010 while (PTR_ERR(exp) == -ENOENT && !IS_ROOT(path->dentry)) {
1011 struct dentry *parent = dget_parent(path->dentry);
1012 dput(path->dentry);
1013 path->dentry = parent;
1014 exp = rqst_exp_get_by_name(rqstp, path);
1015 }
1016 dput(path->dentry);
1017 path->dentry = saved;
1018 return exp;
1019}
1020
1021struct svc_export *rqst_find_fsidzero_export(struct svc_rqst *rqstp)
1022{
1023 u32 fsidv[2];
1024
1025 mk_fsid(FSID_NUM, fsidv, 0, 0, 0, NULL);
1026
1027 return rqst_exp_find(rqstp, FSID_NUM, fsidv);
1028}
1029
1030/*
1031 * Called when we need the filehandle for the root of the pseudofs,
1032 * for a given NFSv4 client. The root is defined to be the
1033 * export point with fsid==0
1034 */
1035__be32
1036exp_pseudoroot(struct svc_rqst *rqstp, struct svc_fh *fhp)
1037{
1038 struct svc_export *exp;
1039 __be32 rv;
1040
1041 exp = rqst_find_fsidzero_export(rqstp);
1042 if (IS_ERR(exp))
1043 return nfserrno(PTR_ERR(exp));
1044 rv = fh_compose(fhp, exp, exp->ex_path.dentry, NULL);
1045 exp_put(exp);
1046 return rv;
1047}
1048
1049/* Iterator */
1050
1051static void *e_start(struct seq_file *m, loff_t *pos)
1052 __acquires(((struct cache_detail *)m->private)->hash_lock)
1053{
1054 loff_t n = *pos;
1055 unsigned hash, export;
1056 struct cache_head *ch;
1057 struct cache_detail *cd = m->private;
1058 struct cache_head **export_table = cd->hash_table;
1059
1060 read_lock(&cd->hash_lock);
1061 if (!n--)
1062 return SEQ_START_TOKEN;
1063 hash = n >> 32;
1064 export = n & ((1LL<<32) - 1);
1065
1066
1067 for (ch=export_table[hash]; ch; ch=ch->next)
1068 if (!export--)
1069 return ch;
1070 n &= ~((1LL<<32) - 1);
1071 do {
1072 hash++;
1073 n += 1LL<<32;
1074 } while(hash < EXPORT_HASHMAX && export_table[hash]==NULL);
1075 if (hash >= EXPORT_HASHMAX)
1076 return NULL;
1077 *pos = n+1;
1078 return export_table[hash];
1079}
1080
1081static void *e_next(struct seq_file *m, void *p, loff_t *pos)
1082{
1083 struct cache_head *ch = p;
1084 int hash = (*pos >> 32);
1085 struct cache_detail *cd = m->private;
1086 struct cache_head **export_table = cd->hash_table;
1087
1088 if (p == SEQ_START_TOKEN)
1089 hash = 0;
1090 else if (ch->next == NULL) {
1091 hash++;
1092 *pos += 1LL<<32;
1093 } else {
1094 ++*pos;
1095 return ch->next;
1096 }
1097 *pos &= ~((1LL<<32) - 1);
1098 while (hash < EXPORT_HASHMAX && export_table[hash] == NULL) {
1099 hash++;
1100 *pos += 1LL<<32;
1101 }
1102 if (hash >= EXPORT_HASHMAX)
1103 return NULL;
1104 ++*pos;
1105 return export_table[hash];
1106}
1107
1108static void e_stop(struct seq_file *m, void *p)
1109 __releases(((struct cache_detail *)m->private)->hash_lock)
1110{
1111 struct cache_detail *cd = m->private;
1112
1113 read_unlock(&cd->hash_lock);
1114}
1115
1116static struct flags {
1117 int flag;
1118 char *name[2];
1119} expflags[] = {
1120 { NFSEXP_READONLY, {"ro", "rw"}},
1121 { NFSEXP_INSECURE_PORT, {"insecure", ""}},
1122 { NFSEXP_ROOTSQUASH, {"root_squash", "no_root_squash"}},
1123 { NFSEXP_ALLSQUASH, {"all_squash", ""}},
1124 { NFSEXP_ASYNC, {"async", "sync"}},
1125 { NFSEXP_GATHERED_WRITES, {"wdelay", "no_wdelay"}},
1126 { NFSEXP_NOHIDE, {"nohide", ""}},
1127 { NFSEXP_CROSSMOUNT, {"crossmnt", ""}},
1128 { NFSEXP_NOSUBTREECHECK, {"no_subtree_check", ""}},
1129 { NFSEXP_NOAUTHNLM, {"insecure_locks", ""}},
1130 { NFSEXP_V4ROOT, {"v4root", ""}},
1131 { 0, {"", ""}}
1132};
1133
1134static void show_expflags(struct seq_file *m, int flags, int mask)
1135{
1136 struct flags *flg;
1137 int state, first = 0;
1138
1139 for (flg = expflags; flg->flag; flg++) {
1140 if (flg->flag & ~mask)
1141 continue;
1142 state = (flg->flag & flags) ? 0 : 1;
1143 if (*flg->name[state])
1144 seq_printf(m, "%s%s", first++?",":"", flg->name[state]);
1145 }
1146}
1147
1148static void show_secinfo_flags(struct seq_file *m, int flags)
1149{
1150 seq_printf(m, ",");
1151 show_expflags(m, flags, NFSEXP_SECINFO_FLAGS);
1152}
1153
1154static bool secinfo_flags_equal(int f, int g)
1155{
1156 f &= NFSEXP_SECINFO_FLAGS;
1157 g &= NFSEXP_SECINFO_FLAGS;
1158 return f == g;
1159}
1160
1161static int show_secinfo_run(struct seq_file *m, struct exp_flavor_info **fp, struct exp_flavor_info *end)
1162{
1163 int flags;
1164
1165 flags = (*fp)->flags;
1166 seq_printf(m, ",sec=%d", (*fp)->pseudoflavor);
1167 (*fp)++;
1168 while (*fp != end && secinfo_flags_equal(flags, (*fp)->flags)) {
1169 seq_printf(m, ":%d", (*fp)->pseudoflavor);
1170 (*fp)++;
1171 }
1172 return flags;
1173}
1174
1175static void show_secinfo(struct seq_file *m, struct svc_export *exp)
1176{
1177 struct exp_flavor_info *f;
1178 struct exp_flavor_info *end = exp->ex_flavors + exp->ex_nflavors;
1179 int flags;
1180
1181 if (exp->ex_nflavors == 0)
1182 return;
1183 f = exp->ex_flavors;
1184 flags = show_secinfo_run(m, &f, end);
1185 if (!secinfo_flags_equal(flags, exp->ex_flags))
1186 show_secinfo_flags(m, flags);
1187 while (f != end) {
1188 flags = show_secinfo_run(m, &f, end);
1189 show_secinfo_flags(m, flags);
1190 }
1191}
1192
1193static void exp_flags(struct seq_file *m, int flag, int fsid,
1194 kuid_t anonu, kgid_t anong, struct nfsd4_fs_locations *fsloc)
1195{
1196 show_expflags(m, flag, NFSEXP_ALLFLAGS);
1197 if (flag & NFSEXP_FSID)
1198 seq_printf(m, ",fsid=%d", fsid);
1199 if (!uid_eq(anonu, make_kuid(&init_user_ns, (uid_t)-2)) &&
1200 !uid_eq(anonu, make_kuid(&init_user_ns, 0x10000-2)))
1201 seq_printf(m, ",anonuid=%u", from_kuid(&init_user_ns, anonu));
1202 if (!gid_eq(anong, make_kgid(&init_user_ns, (gid_t)-2)) &&
1203 !gid_eq(anong, make_kgid(&init_user_ns, 0x10000-2)))
1204 seq_printf(m, ",anongid=%u", from_kgid(&init_user_ns, anong));
1205 if (fsloc && fsloc->locations_count > 0) {
1206 char *loctype = (fsloc->migrated) ? "refer" : "replicas";
1207 int i;
1208
1209 seq_printf(m, ",%s=", loctype);
1210 seq_escape(m, fsloc->locations[0].path, ",;@ \t\n\\");
1211 seq_putc(m, '@');
1212 seq_escape(m, fsloc->locations[0].hosts, ",;@ \t\n\\");
1213 for (i = 1; i < fsloc->locations_count; i++) {
1214 seq_putc(m, ';');
1215 seq_escape(m, fsloc->locations[i].path, ",;@ \t\n\\");
1216 seq_putc(m, '@');
1217 seq_escape(m, fsloc->locations[i].hosts, ",;@ \t\n\\");
1218 }
1219 }
1220}
1221
1222static int e_show(struct seq_file *m, void *p)
1223{
1224 struct cache_head *cp = p;
1225 struct svc_export *exp = container_of(cp, struct svc_export, h);
1226 struct cache_detail *cd = m->private;
1227
1228 if (p == SEQ_START_TOKEN) {
1229 seq_puts(m, "# Version 1.1\n");
1230 seq_puts(m, "# Path Client(Flags) # IPs\n");
1231 return 0;
1232 }
1233
1234 cache_get(&exp->h);
1235 if (cache_check(cd, &exp->h, NULL))
1236 return 0;
1237 exp_put(exp);
1238 return svc_export_show(m, cd, cp);
1239}
1240
1241const struct seq_operations nfs_exports_op = {
1242 .start = e_start,
1243 .next = e_next,
1244 .stop = e_stop,
1245 .show = e_show,
1246};
1247
1248/*
1249 * Initialize the exports module.
1250 */
1251int
1252nfsd_export_init(struct net *net)
1253{
1254 int rv;
1255 struct nfsd_net *nn = net_generic(net, nfsd_net_id);
1256
1257 dprintk("nfsd: initializing export module (net: %p).\n", net);
1258
1259 nn->svc_export_cache = cache_create_net(&svc_export_cache_template, net);
1260 if (IS_ERR(nn->svc_export_cache))
1261 return PTR_ERR(nn->svc_export_cache);
1262 rv = cache_register_net(nn->svc_export_cache, net);
1263 if (rv)
1264 goto destroy_export_cache;
1265
1266 nn->svc_expkey_cache = cache_create_net(&svc_expkey_cache_template, net);
1267 if (IS_ERR(nn->svc_expkey_cache)) {
1268 rv = PTR_ERR(nn->svc_expkey_cache);
1269 goto unregister_export_cache;
1270 }
1271 rv = cache_register_net(nn->svc_expkey_cache, net);
1272 if (rv)
1273 goto destroy_expkey_cache;
1274 return 0;
1275
1276destroy_expkey_cache:
1277 cache_destroy_net(nn->svc_expkey_cache, net);
1278unregister_export_cache:
1279 cache_unregister_net(nn->svc_export_cache, net);
1280destroy_export_cache:
1281 cache_destroy_net(nn->svc_export_cache, net);
1282 return rv;
1283}
1284
1285/*
1286 * Flush exports table - called when last nfsd thread is killed
1287 */
1288void
1289nfsd_export_flush(struct net *net)
1290{
1291 struct nfsd_net *nn = net_generic(net, nfsd_net_id);
1292
1293 cache_purge(nn->svc_expkey_cache);
1294 cache_purge(nn->svc_export_cache);
1295}
1296
1297/*
1298 * Shutdown the exports module.
1299 */
1300void
1301nfsd_export_shutdown(struct net *net)
1302{
1303 struct nfsd_net *nn = net_generic(net, nfsd_net_id);
1304
1305 dprintk("nfsd: shutting down export module (net: %p).\n", net);
1306
1307 cache_unregister_net(nn->svc_expkey_cache, net);
1308 cache_unregister_net(nn->svc_export_cache, net);
1309 cache_destroy_net(nn->svc_expkey_cache, net);
1310 cache_destroy_net(nn->svc_export_cache, net);
1311 svcauth_unix_purge(net);
1312
1313 dprintk("nfsd: export shutdown complete (net: %p).\n", net);
1314}