Loading...
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 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 cache_detail *cd, struct svc_expkey *new,
76 struct svc_expkey *old);
77static struct svc_expkey *svc_expkey_lookup(struct cache_detail *cd, struct svc_expkey *);
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(cd, &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(cd, &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(cd, &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, cd);
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_template = {
244 .owner = THIS_MODULE,
245 .hash_size = EXPKEY_HASHMAX,
246 .name = "nfsd.fh",
247 .cache_put = expkey_put,
248 .cache_upcall = expkey_upcall,
249 .cache_parse = expkey_parse,
250 .cache_show = expkey_show,
251 .match = expkey_match,
252 .init = expkey_init,
253 .update = expkey_update,
254 .alloc = expkey_alloc,
255};
256
257static int
258svc_expkey_hash(struct svc_expkey *item)
259{
260 int hash = item->ek_fsidtype;
261 char * cp = (char*)item->ek_fsid;
262 int len = key_len(item->ek_fsidtype);
263
264 hash ^= hash_mem(cp, len, EXPKEY_HASHBITS);
265 hash ^= hash_ptr(item->ek_client, EXPKEY_HASHBITS);
266 hash &= EXPKEY_HASHMASK;
267 return hash;
268}
269
270static struct svc_expkey *
271svc_expkey_lookup(struct cache_detail *cd, struct svc_expkey *item)
272{
273 struct cache_head *ch;
274 int hash = svc_expkey_hash(item);
275
276 ch = sunrpc_cache_lookup(cd, &item->h, hash);
277 if (ch)
278 return container_of(ch, struct svc_expkey, h);
279 else
280 return NULL;
281}
282
283static struct svc_expkey *
284svc_expkey_update(struct cache_detail *cd, struct svc_expkey *new,
285 struct svc_expkey *old)
286{
287 struct cache_head *ch;
288 int hash = svc_expkey_hash(new);
289
290 ch = sunrpc_cache_update(cd, &new->h, &old->h, hash);
291 if (ch)
292 return container_of(ch, struct svc_expkey, h);
293 else
294 return NULL;
295}
296
297
298#define EXPORT_HASHBITS 8
299#define EXPORT_HASHMAX (1<< EXPORT_HASHBITS)
300
301static void nfsd4_fslocs_free(struct nfsd4_fs_locations *fsloc)
302{
303 int i;
304
305 for (i = 0; i < fsloc->locations_count; i++) {
306 kfree(fsloc->locations[i].path);
307 kfree(fsloc->locations[i].hosts);
308 }
309 kfree(fsloc->locations);
310}
311
312static void svc_export_put(struct kref *ref)
313{
314 struct svc_export *exp = container_of(ref, struct svc_export, h.ref);
315 path_put(&exp->ex_path);
316 auth_domain_put(exp->ex_client);
317 nfsd4_fslocs_free(&exp->ex_fslocs);
318 kfree(exp);
319}
320
321static void svc_export_request(struct cache_detail *cd,
322 struct cache_head *h,
323 char **bpp, int *blen)
324{
325 /* client path */
326 struct svc_export *exp = container_of(h, struct svc_export, h);
327 char *pth;
328
329 qword_add(bpp, blen, exp->ex_client->name);
330 pth = d_path(&exp->ex_path, *bpp, *blen);
331 if (IS_ERR(pth)) {
332 /* is this correct? */
333 (*bpp)[0] = '\n';
334 return;
335 }
336 qword_add(bpp, blen, pth);
337 (*bpp)[-1] = '\n';
338}
339
340static int svc_export_upcall(struct cache_detail *cd, struct cache_head *h)
341{
342 return sunrpc_cache_pipe_upcall(cd, h, svc_export_request);
343}
344
345static struct svc_export *svc_export_update(struct svc_export *new,
346 struct svc_export *old);
347static struct svc_export *svc_export_lookup(struct svc_export *);
348
349static int check_export(struct inode *inode, int *flags, unsigned char *uuid)
350{
351
352 /*
353 * We currently export only dirs, regular files, and (for v4
354 * pseudoroot) symlinks.
355 */
356 if (!S_ISDIR(inode->i_mode) &&
357 !S_ISLNK(inode->i_mode) &&
358 !S_ISREG(inode->i_mode))
359 return -ENOTDIR;
360
361 /*
362 * Mountd should never pass down a writeable V4ROOT export, but,
363 * just to make sure:
364 */
365 if (*flags & NFSEXP_V4ROOT)
366 *flags |= NFSEXP_READONLY;
367
368 /* There are two requirements on a filesystem to be exportable.
369 * 1: We must be able to identify the filesystem from a number.
370 * either a device number (so FS_REQUIRES_DEV needed)
371 * or an FSID number (so NFSEXP_FSID or ->uuid is needed).
372 * 2: We must be able to find an inode from a filehandle.
373 * This means that s_export_op must be set.
374 */
375 if (!(inode->i_sb->s_type->fs_flags & FS_REQUIRES_DEV) &&
376 !(*flags & NFSEXP_FSID) &&
377 uuid == NULL) {
378 dprintk("exp_export: export of non-dev fs without fsid\n");
379 return -EINVAL;
380 }
381
382 if (!inode->i_sb->s_export_op ||
383 !inode->i_sb->s_export_op->fh_to_dentry) {
384 dprintk("exp_export: export of invalid fs type.\n");
385 return -EINVAL;
386 }
387
388 return 0;
389
390}
391
392#ifdef CONFIG_NFSD_V4
393
394static int
395fsloc_parse(char **mesg, char *buf, struct nfsd4_fs_locations *fsloc)
396{
397 int len;
398 int migrated, i, err;
399
400 /* listsize */
401 err = get_int(mesg, &fsloc->locations_count);
402 if (err)
403 return err;
404 if (fsloc->locations_count > MAX_FS_LOCATIONS)
405 return -EINVAL;
406 if (fsloc->locations_count == 0)
407 return 0;
408
409 fsloc->locations = kzalloc(fsloc->locations_count
410 * sizeof(struct nfsd4_fs_location), GFP_KERNEL);
411 if (!fsloc->locations)
412 return -ENOMEM;
413 for (i=0; i < fsloc->locations_count; i++) {
414 /* colon separated host list */
415 err = -EINVAL;
416 len = qword_get(mesg, buf, PAGE_SIZE);
417 if (len <= 0)
418 goto out_free_all;
419 err = -ENOMEM;
420 fsloc->locations[i].hosts = kstrdup(buf, GFP_KERNEL);
421 if (!fsloc->locations[i].hosts)
422 goto out_free_all;
423 err = -EINVAL;
424 /* slash separated path component list */
425 len = qword_get(mesg, buf, PAGE_SIZE);
426 if (len <= 0)
427 goto out_free_all;
428 err = -ENOMEM;
429 fsloc->locations[i].path = kstrdup(buf, GFP_KERNEL);
430 if (!fsloc->locations[i].path)
431 goto out_free_all;
432 }
433 /* migrated */
434 err = get_int(mesg, &migrated);
435 if (err)
436 goto out_free_all;
437 err = -EINVAL;
438 if (migrated < 0 || migrated > 1)
439 goto out_free_all;
440 fsloc->migrated = migrated;
441 return 0;
442out_free_all:
443 nfsd4_fslocs_free(fsloc);
444 return err;
445}
446
447static int secinfo_parse(char **mesg, char *buf, struct svc_export *exp)
448{
449 int listsize, err;
450 struct exp_flavor_info *f;
451
452 err = get_int(mesg, &listsize);
453 if (err)
454 return err;
455 if (listsize < 0 || listsize > MAX_SECINFO_LIST)
456 return -EINVAL;
457
458 for (f = exp->ex_flavors; f < exp->ex_flavors + listsize; f++) {
459 err = get_int(mesg, &f->pseudoflavor);
460 if (err)
461 return err;
462 /*
463 * XXX: It would be nice to also check whether this
464 * pseudoflavor is supported, so we can discover the
465 * problem at export time instead of when a client fails
466 * to authenticate.
467 */
468 err = get_int(mesg, &f->flags);
469 if (err)
470 return err;
471 /* Only some flags are allowed to differ between flavors: */
472 if (~NFSEXP_SECINFO_FLAGS & (f->flags ^ exp->ex_flags))
473 return -EINVAL;
474 }
475 exp->ex_nflavors = listsize;
476 return 0;
477}
478
479#else /* CONFIG_NFSD_V4 */
480static inline int
481fsloc_parse(char **mesg, char *buf, struct nfsd4_fs_locations *fsloc){return 0;}
482static inline int
483secinfo_parse(char **mesg, char *buf, struct svc_export *exp) { return 0; }
484#endif
485
486static int svc_export_parse(struct cache_detail *cd, char *mesg, int mlen)
487{
488 /* client path expiry [flags anonuid anongid fsid] */
489 char *buf;
490 int len;
491 int err;
492 struct auth_domain *dom = NULL;
493 struct svc_export exp = {}, *expp;
494 int an_int;
495
496 if (mesg[mlen-1] != '\n')
497 return -EINVAL;
498 mesg[mlen-1] = 0;
499
500 buf = kmalloc(PAGE_SIZE, GFP_KERNEL);
501 if (!buf)
502 return -ENOMEM;
503
504 /* client */
505 err = -EINVAL;
506 len = qword_get(&mesg, buf, PAGE_SIZE);
507 if (len <= 0)
508 goto out;
509
510 err = -ENOENT;
511 dom = auth_domain_find(buf);
512 if (!dom)
513 goto out;
514
515 /* path */
516 err = -EINVAL;
517 if ((len = qword_get(&mesg, buf, PAGE_SIZE)) <= 0)
518 goto out1;
519
520 err = kern_path(buf, 0, &exp.ex_path);
521 if (err)
522 goto out1;
523
524 exp.ex_client = dom;
525 exp.cd = cd;
526
527 /* expiry */
528 err = -EINVAL;
529 exp.h.expiry_time = get_expiry(&mesg);
530 if (exp.h.expiry_time == 0)
531 goto out3;
532
533 /* flags */
534 err = get_int(&mesg, &an_int);
535 if (err == -ENOENT) {
536 err = 0;
537 set_bit(CACHE_NEGATIVE, &exp.h.flags);
538 } else {
539 if (err || an_int < 0)
540 goto out3;
541 exp.ex_flags= an_int;
542
543 /* anon uid */
544 err = get_int(&mesg, &an_int);
545 if (err)
546 goto out3;
547 exp.ex_anon_uid= an_int;
548
549 /* anon gid */
550 err = get_int(&mesg, &an_int);
551 if (err)
552 goto out3;
553 exp.ex_anon_gid= an_int;
554
555 /* fsid */
556 err = get_int(&mesg, &an_int);
557 if (err)
558 goto out3;
559 exp.ex_fsid = an_int;
560
561 while ((len = qword_get(&mesg, buf, PAGE_SIZE)) > 0) {
562 if (strcmp(buf, "fsloc") == 0)
563 err = fsloc_parse(&mesg, buf, &exp.ex_fslocs);
564 else if (strcmp(buf, "uuid") == 0) {
565 /* expect a 16 byte uuid encoded as \xXXXX... */
566 len = qword_get(&mesg, buf, PAGE_SIZE);
567 if (len != 16)
568 err = -EINVAL;
569 else {
570 exp.ex_uuid =
571 kmemdup(buf, 16, GFP_KERNEL);
572 if (exp.ex_uuid == NULL)
573 err = -ENOMEM;
574 }
575 } else if (strcmp(buf, "secinfo") == 0)
576 err = secinfo_parse(&mesg, buf, &exp);
577 else
578 /* quietly ignore unknown words and anything
579 * following. Newer user-space can try to set
580 * new values, then see what the result was.
581 */
582 break;
583 if (err)
584 goto out4;
585 }
586
587 err = check_export(exp.ex_path.dentry->d_inode, &exp.ex_flags,
588 exp.ex_uuid);
589 if (err)
590 goto out4;
591 }
592
593 expp = svc_export_lookup(&exp);
594 if (expp)
595 expp = svc_export_update(&exp, expp);
596 else
597 err = -ENOMEM;
598 cache_flush();
599 if (expp == NULL)
600 err = -ENOMEM;
601 else
602 exp_put(expp);
603out4:
604 nfsd4_fslocs_free(&exp.ex_fslocs);
605 kfree(exp.ex_uuid);
606out3:
607 path_put(&exp.ex_path);
608out1:
609 auth_domain_put(dom);
610out:
611 kfree(buf);
612 return err;
613}
614
615static void exp_flags(struct seq_file *m, int flag, int fsid,
616 uid_t anonu, uid_t anong, struct nfsd4_fs_locations *fslocs);
617static void show_secinfo(struct seq_file *m, struct svc_export *exp);
618
619static int svc_export_show(struct seq_file *m,
620 struct cache_detail *cd,
621 struct cache_head *h)
622{
623 struct svc_export *exp ;
624
625 if (h ==NULL) {
626 seq_puts(m, "#path domain(flags)\n");
627 return 0;
628 }
629 exp = container_of(h, struct svc_export, h);
630 seq_path(m, &exp->ex_path, " \t\n\\");
631 seq_putc(m, '\t');
632 seq_escape(m, exp->ex_client->name, " \t\n\\");
633 seq_putc(m, '(');
634 if (test_bit(CACHE_VALID, &h->flags) &&
635 !test_bit(CACHE_NEGATIVE, &h->flags)) {
636 exp_flags(m, exp->ex_flags, exp->ex_fsid,
637 exp->ex_anon_uid, exp->ex_anon_gid, &exp->ex_fslocs);
638 if (exp->ex_uuid) {
639 int i;
640 seq_puts(m, ",uuid=");
641 for (i=0; i<16; i++) {
642 if ((i&3) == 0 && i)
643 seq_putc(m, ':');
644 seq_printf(m, "%02x", exp->ex_uuid[i]);
645 }
646 }
647 show_secinfo(m, exp);
648 }
649 seq_puts(m, ")\n");
650 return 0;
651}
652static int svc_export_match(struct cache_head *a, struct cache_head *b)
653{
654 struct svc_export *orig = container_of(a, struct svc_export, h);
655 struct svc_export *new = container_of(b, struct svc_export, h);
656 return orig->ex_client == new->ex_client &&
657 orig->ex_path.dentry == new->ex_path.dentry &&
658 orig->ex_path.mnt == new->ex_path.mnt;
659}
660
661static void svc_export_init(struct cache_head *cnew, struct cache_head *citem)
662{
663 struct svc_export *new = container_of(cnew, struct svc_export, h);
664 struct svc_export *item = container_of(citem, struct svc_export, h);
665
666 kref_get(&item->ex_client->ref);
667 new->ex_client = item->ex_client;
668 new->ex_path.dentry = dget(item->ex_path.dentry);
669 new->ex_path.mnt = mntget(item->ex_path.mnt);
670 new->ex_fslocs.locations = NULL;
671 new->ex_fslocs.locations_count = 0;
672 new->ex_fslocs.migrated = 0;
673 new->cd = item->cd;
674}
675
676static void export_update(struct cache_head *cnew, struct cache_head *citem)
677{
678 struct svc_export *new = container_of(cnew, struct svc_export, h);
679 struct svc_export *item = container_of(citem, struct svc_export, h);
680 int i;
681
682 new->ex_flags = item->ex_flags;
683 new->ex_anon_uid = item->ex_anon_uid;
684 new->ex_anon_gid = item->ex_anon_gid;
685 new->ex_fsid = item->ex_fsid;
686 new->ex_uuid = item->ex_uuid;
687 item->ex_uuid = NULL;
688 new->ex_fslocs.locations = item->ex_fslocs.locations;
689 item->ex_fslocs.locations = NULL;
690 new->ex_fslocs.locations_count = item->ex_fslocs.locations_count;
691 item->ex_fslocs.locations_count = 0;
692 new->ex_fslocs.migrated = item->ex_fslocs.migrated;
693 item->ex_fslocs.migrated = 0;
694 new->ex_nflavors = item->ex_nflavors;
695 for (i = 0; i < MAX_SECINFO_LIST; i++) {
696 new->ex_flavors[i] = item->ex_flavors[i];
697 }
698}
699
700static struct cache_head *svc_export_alloc(void)
701{
702 struct svc_export *i = kmalloc(sizeof(*i), GFP_KERNEL);
703 if (i)
704 return &i->h;
705 else
706 return NULL;
707}
708
709static struct cache_detail svc_export_cache_template = {
710 .owner = THIS_MODULE,
711 .hash_size = EXPORT_HASHMAX,
712 .name = "nfsd.export",
713 .cache_put = svc_export_put,
714 .cache_upcall = svc_export_upcall,
715 .cache_parse = svc_export_parse,
716 .cache_show = svc_export_show,
717 .match = svc_export_match,
718 .init = svc_export_init,
719 .update = export_update,
720 .alloc = svc_export_alloc,
721};
722
723static int
724svc_export_hash(struct svc_export *exp)
725{
726 int hash;
727
728 hash = hash_ptr(exp->ex_client, EXPORT_HASHBITS);
729 hash ^= hash_ptr(exp->ex_path.dentry, EXPORT_HASHBITS);
730 hash ^= hash_ptr(exp->ex_path.mnt, EXPORT_HASHBITS);
731 return hash;
732}
733
734static struct svc_export *
735svc_export_lookup(struct svc_export *exp)
736{
737 struct cache_head *ch;
738 int hash = svc_export_hash(exp);
739
740 ch = sunrpc_cache_lookup(exp->cd, &exp->h, hash);
741 if (ch)
742 return container_of(ch, struct svc_export, h);
743 else
744 return NULL;
745}
746
747static struct svc_export *
748svc_export_update(struct svc_export *new, struct svc_export *old)
749{
750 struct cache_head *ch;
751 int hash = svc_export_hash(old);
752
753 ch = sunrpc_cache_update(old->cd, &new->h, &old->h, hash);
754 if (ch)
755 return container_of(ch, struct svc_export, h);
756 else
757 return NULL;
758}
759
760
761static struct svc_expkey *
762exp_find_key(struct cache_detail *cd, svc_client *clp, int fsid_type,
763 u32 *fsidv, struct cache_req *reqp)
764{
765 struct svc_expkey key, *ek;
766 int err;
767
768 if (!clp)
769 return ERR_PTR(-ENOENT);
770
771 key.ek_client = clp;
772 key.ek_fsidtype = fsid_type;
773 memcpy(key.ek_fsid, fsidv, key_len(fsid_type));
774
775 ek = svc_expkey_lookup(cd, &key);
776 if (ek == NULL)
777 return ERR_PTR(-ENOMEM);
778 err = cache_check(cd, &ek->h, reqp);
779 if (err)
780 return ERR_PTR(err);
781 return ek;
782}
783
784
785static svc_export *exp_get_by_name(struct cache_detail *cd, svc_client *clp,
786 const struct path *path, struct cache_req *reqp)
787{
788 struct svc_export *exp, key;
789 int err;
790
791 if (!clp)
792 return ERR_PTR(-ENOENT);
793
794 key.ex_client = clp;
795 key.ex_path = *path;
796 key.cd = cd;
797
798 exp = svc_export_lookup(&key);
799 if (exp == NULL)
800 return ERR_PTR(-ENOMEM);
801 err = cache_check(cd, &exp->h, reqp);
802 if (err)
803 return ERR_PTR(err);
804 return exp;
805}
806
807/*
808 * Find the export entry for a given dentry.
809 */
810static struct svc_export *exp_parent(struct cache_detail *cd, svc_client *clp,
811 struct path *path)
812{
813 struct dentry *saved = dget(path->dentry);
814 svc_export *exp = exp_get_by_name(cd, clp, path, NULL);
815
816 while (PTR_ERR(exp) == -ENOENT && !IS_ROOT(path->dentry)) {
817 struct dentry *parent = dget_parent(path->dentry);
818 dput(path->dentry);
819 path->dentry = parent;
820 exp = exp_get_by_name(cd, clp, path, NULL);
821 }
822 dput(path->dentry);
823 path->dentry = saved;
824 return exp;
825}
826
827
828
829/*
830 * Obtain the root fh on behalf of a client.
831 * This could be done in user space, but I feel that it adds some safety
832 * since its harder to fool a kernel module than a user space program.
833 */
834int
835exp_rootfh(struct net *net, svc_client *clp, char *name,
836 struct knfsd_fh *f, int maxsize)
837{
838 struct svc_export *exp;
839 struct path path;
840 struct inode *inode;
841 struct svc_fh fh;
842 int err;
843 struct nfsd_net *nn = net_generic(net, nfsd_net_id);
844 struct cache_detail *cd = nn->svc_export_cache;
845
846 err = -EPERM;
847 /* NB: we probably ought to check that it's NUL-terminated */
848 if (kern_path(name, 0, &path)) {
849 printk("nfsd: exp_rootfh path not found %s", name);
850 return err;
851 }
852 inode = path.dentry->d_inode;
853
854 dprintk("nfsd: exp_rootfh(%s [%p] %s:%s/%ld)\n",
855 name, path.dentry, clp->name,
856 inode->i_sb->s_id, inode->i_ino);
857 exp = exp_parent(cd, clp, &path);
858 if (IS_ERR(exp)) {
859 err = PTR_ERR(exp);
860 goto out;
861 }
862
863 /*
864 * fh must be initialized before calling fh_compose
865 */
866 fh_init(&fh, maxsize);
867 if (fh_compose(&fh, exp, path.dentry, NULL))
868 err = -EINVAL;
869 else
870 err = 0;
871 memcpy(f, &fh.fh_handle, sizeof(struct knfsd_fh));
872 fh_put(&fh);
873 exp_put(exp);
874out:
875 path_put(&path);
876 return err;
877}
878
879static struct svc_export *exp_find(struct cache_detail *cd,
880 struct auth_domain *clp, int fsid_type,
881 u32 *fsidv, struct cache_req *reqp)
882{
883 struct svc_export *exp;
884 struct nfsd_net *nn = net_generic(cd->net, nfsd_net_id);
885 struct svc_expkey *ek = exp_find_key(nn->svc_expkey_cache, clp, fsid_type, fsidv, reqp);
886 if (IS_ERR(ek))
887 return ERR_CAST(ek);
888
889 exp = exp_get_by_name(cd, clp, &ek->ek_path, reqp);
890 cache_put(&ek->h, nn->svc_expkey_cache);
891
892 if (IS_ERR(exp))
893 return ERR_CAST(exp);
894 return exp;
895}
896
897__be32 check_nfsd_access(struct svc_export *exp, struct svc_rqst *rqstp)
898{
899 struct exp_flavor_info *f;
900 struct exp_flavor_info *end = exp->ex_flavors + exp->ex_nflavors;
901
902 /* legacy gss-only clients are always OK: */
903 if (exp->ex_client == rqstp->rq_gssclient)
904 return 0;
905 /* ip-address based client; check sec= export option: */
906 for (f = exp->ex_flavors; f < end; f++) {
907 if (f->pseudoflavor == rqstp->rq_cred.cr_flavor)
908 return 0;
909 }
910 /* defaults in absence of sec= options: */
911 if (exp->ex_nflavors == 0) {
912 if (rqstp->rq_cred.cr_flavor == RPC_AUTH_NULL ||
913 rqstp->rq_cred.cr_flavor == RPC_AUTH_UNIX)
914 return 0;
915 }
916 return nfserr_wrongsec;
917}
918
919/*
920 * Uses rq_client and rq_gssclient to find an export; uses rq_client (an
921 * auth_unix client) if it's available and has secinfo information;
922 * otherwise, will try to use rq_gssclient.
923 *
924 * Called from functions that handle requests; functions that do work on
925 * behalf of mountd are passed a single client name to use, and should
926 * use exp_get_by_name() or exp_find().
927 */
928struct svc_export *
929rqst_exp_get_by_name(struct svc_rqst *rqstp, struct path *path)
930{
931 struct svc_export *gssexp, *exp = ERR_PTR(-ENOENT);
932 struct nfsd_net *nn = net_generic(rqstp->rq_xprt->xpt_net, nfsd_net_id);
933 struct cache_detail *cd = nn->svc_export_cache;
934
935 if (rqstp->rq_client == NULL)
936 goto gss;
937
938 /* First try the auth_unix client: */
939 exp = exp_get_by_name(cd, rqstp->rq_client, path, &rqstp->rq_chandle);
940 if (PTR_ERR(exp) == -ENOENT)
941 goto gss;
942 if (IS_ERR(exp))
943 return exp;
944 /* If it has secinfo, assume there are no gss/... clients */
945 if (exp->ex_nflavors > 0)
946 return exp;
947gss:
948 /* Otherwise, try falling back on gss client */
949 if (rqstp->rq_gssclient == NULL)
950 return exp;
951 gssexp = exp_get_by_name(cd, rqstp->rq_gssclient, path, &rqstp->rq_chandle);
952 if (PTR_ERR(gssexp) == -ENOENT)
953 return exp;
954 if (!IS_ERR(exp))
955 exp_put(exp);
956 return gssexp;
957}
958
959struct svc_export *
960rqst_exp_find(struct svc_rqst *rqstp, int fsid_type, u32 *fsidv)
961{
962 struct svc_export *gssexp, *exp = ERR_PTR(-ENOENT);
963 struct nfsd_net *nn = net_generic(rqstp->rq_xprt->xpt_net, nfsd_net_id);
964 struct cache_detail *cd = nn->svc_export_cache;
965
966 if (rqstp->rq_client == NULL)
967 goto gss;
968
969 /* First try the auth_unix client: */
970 exp = exp_find(cd, rqstp->rq_client, fsid_type,
971 fsidv, &rqstp->rq_chandle);
972 if (PTR_ERR(exp) == -ENOENT)
973 goto gss;
974 if (IS_ERR(exp))
975 return exp;
976 /* If it has secinfo, assume there are no gss/... clients */
977 if (exp->ex_nflavors > 0)
978 return exp;
979gss:
980 /* Otherwise, try falling back on gss client */
981 if (rqstp->rq_gssclient == NULL)
982 return exp;
983 gssexp = exp_find(cd, rqstp->rq_gssclient, fsid_type, fsidv,
984 &rqstp->rq_chandle);
985 if (PTR_ERR(gssexp) == -ENOENT)
986 return exp;
987 if (!IS_ERR(exp))
988 exp_put(exp);
989 return gssexp;
990}
991
992struct svc_export *
993rqst_exp_parent(struct svc_rqst *rqstp, struct path *path)
994{
995 struct dentry *saved = dget(path->dentry);
996 struct svc_export *exp = rqst_exp_get_by_name(rqstp, path);
997
998 while (PTR_ERR(exp) == -ENOENT && !IS_ROOT(path->dentry)) {
999 struct dentry *parent = dget_parent(path->dentry);
1000 dput(path->dentry);
1001 path->dentry = parent;
1002 exp = rqst_exp_get_by_name(rqstp, path);
1003 }
1004 dput(path->dentry);
1005 path->dentry = saved;
1006 return exp;
1007}
1008
1009struct svc_export *rqst_find_fsidzero_export(struct svc_rqst *rqstp)
1010{
1011 u32 fsidv[2];
1012
1013 mk_fsid(FSID_NUM, fsidv, 0, 0, 0, NULL);
1014
1015 return rqst_exp_find(rqstp, FSID_NUM, fsidv);
1016}
1017
1018/*
1019 * Called when we need the filehandle for the root of the pseudofs,
1020 * for a given NFSv4 client. The root is defined to be the
1021 * export point with fsid==0
1022 */
1023__be32
1024exp_pseudoroot(struct svc_rqst *rqstp, struct svc_fh *fhp)
1025{
1026 struct svc_export *exp;
1027 __be32 rv;
1028
1029 exp = rqst_find_fsidzero_export(rqstp);
1030 if (IS_ERR(exp))
1031 return nfserrno(PTR_ERR(exp));
1032 rv = fh_compose(fhp, exp, exp->ex_path.dentry, NULL);
1033 exp_put(exp);
1034 return rv;
1035}
1036
1037/* Iterator */
1038
1039static void *e_start(struct seq_file *m, loff_t *pos)
1040 __acquires(((struct cache_detail *)m->private)->hash_lock)
1041{
1042 loff_t n = *pos;
1043 unsigned hash, export;
1044 struct cache_head *ch;
1045 struct cache_detail *cd = m->private;
1046 struct cache_head **export_table = cd->hash_table;
1047
1048 read_lock(&cd->hash_lock);
1049 if (!n--)
1050 return SEQ_START_TOKEN;
1051 hash = n >> 32;
1052 export = n & ((1LL<<32) - 1);
1053
1054
1055 for (ch=export_table[hash]; ch; ch=ch->next)
1056 if (!export--)
1057 return ch;
1058 n &= ~((1LL<<32) - 1);
1059 do {
1060 hash++;
1061 n += 1LL<<32;
1062 } while(hash < EXPORT_HASHMAX && export_table[hash]==NULL);
1063 if (hash >= EXPORT_HASHMAX)
1064 return NULL;
1065 *pos = n+1;
1066 return export_table[hash];
1067}
1068
1069static void *e_next(struct seq_file *m, void *p, loff_t *pos)
1070{
1071 struct cache_head *ch = p;
1072 int hash = (*pos >> 32);
1073 struct cache_detail *cd = m->private;
1074 struct cache_head **export_table = cd->hash_table;
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(((struct cache_detail *)m->private)->hash_lock)
1098{
1099 struct cache_detail *cd = m->private;
1100
1101 read_unlock(&cd->hash_lock);
1102}
1103
1104static struct flags {
1105 int flag;
1106 char *name[2];
1107} expflags[] = {
1108 { NFSEXP_READONLY, {"ro", "rw"}},
1109 { NFSEXP_INSECURE_PORT, {"insecure", ""}},
1110 { NFSEXP_ROOTSQUASH, {"root_squash", "no_root_squash"}},
1111 { NFSEXP_ALLSQUASH, {"all_squash", ""}},
1112 { NFSEXP_ASYNC, {"async", "sync"}},
1113 { NFSEXP_GATHERED_WRITES, {"wdelay", "no_wdelay"}},
1114 { NFSEXP_NOHIDE, {"nohide", ""}},
1115 { NFSEXP_CROSSMOUNT, {"crossmnt", ""}},
1116 { NFSEXP_NOSUBTREECHECK, {"no_subtree_check", ""}},
1117 { NFSEXP_NOAUTHNLM, {"insecure_locks", ""}},
1118 { NFSEXP_V4ROOT, {"v4root", ""}},
1119 { 0, {"", ""}}
1120};
1121
1122static void show_expflags(struct seq_file *m, int flags, int mask)
1123{
1124 struct flags *flg;
1125 int state, first = 0;
1126
1127 for (flg = expflags; flg->flag; flg++) {
1128 if (flg->flag & ~mask)
1129 continue;
1130 state = (flg->flag & flags) ? 0 : 1;
1131 if (*flg->name[state])
1132 seq_printf(m, "%s%s", first++?",":"", flg->name[state]);
1133 }
1134}
1135
1136static void show_secinfo_flags(struct seq_file *m, int flags)
1137{
1138 seq_printf(m, ",");
1139 show_expflags(m, flags, NFSEXP_SECINFO_FLAGS);
1140}
1141
1142static bool secinfo_flags_equal(int f, int g)
1143{
1144 f &= NFSEXP_SECINFO_FLAGS;
1145 g &= NFSEXP_SECINFO_FLAGS;
1146 return f == g;
1147}
1148
1149static int show_secinfo_run(struct seq_file *m, struct exp_flavor_info **fp, struct exp_flavor_info *end)
1150{
1151 int flags;
1152
1153 flags = (*fp)->flags;
1154 seq_printf(m, ",sec=%d", (*fp)->pseudoflavor);
1155 (*fp)++;
1156 while (*fp != end && secinfo_flags_equal(flags, (*fp)->flags)) {
1157 seq_printf(m, ":%d", (*fp)->pseudoflavor);
1158 (*fp)++;
1159 }
1160 return flags;
1161}
1162
1163static void show_secinfo(struct seq_file *m, struct svc_export *exp)
1164{
1165 struct exp_flavor_info *f;
1166 struct exp_flavor_info *end = exp->ex_flavors + exp->ex_nflavors;
1167 int flags;
1168
1169 if (exp->ex_nflavors == 0)
1170 return;
1171 f = exp->ex_flavors;
1172 flags = show_secinfo_run(m, &f, end);
1173 if (!secinfo_flags_equal(flags, exp->ex_flags))
1174 show_secinfo_flags(m, flags);
1175 while (f != end) {
1176 flags = show_secinfo_run(m, &f, end);
1177 show_secinfo_flags(m, flags);
1178 }
1179}
1180
1181static void exp_flags(struct seq_file *m, int flag, int fsid,
1182 uid_t anonu, uid_t anong, struct nfsd4_fs_locations *fsloc)
1183{
1184 show_expflags(m, flag, NFSEXP_ALLFLAGS);
1185 if (flag & NFSEXP_FSID)
1186 seq_printf(m, ",fsid=%d", fsid);
1187 if (anonu != (uid_t)-2 && anonu != (0x10000-2))
1188 seq_printf(m, ",anonuid=%u", anonu);
1189 if (anong != (gid_t)-2 && anong != (0x10000-2))
1190 seq_printf(m, ",anongid=%u", anong);
1191 if (fsloc && fsloc->locations_count > 0) {
1192 char *loctype = (fsloc->migrated) ? "refer" : "replicas";
1193 int i;
1194
1195 seq_printf(m, ",%s=", loctype);
1196 seq_escape(m, fsloc->locations[0].path, ",;@ \t\n\\");
1197 seq_putc(m, '@');
1198 seq_escape(m, fsloc->locations[0].hosts, ",;@ \t\n\\");
1199 for (i = 1; i < fsloc->locations_count; i++) {
1200 seq_putc(m, ';');
1201 seq_escape(m, fsloc->locations[i].path, ",;@ \t\n\\");
1202 seq_putc(m, '@');
1203 seq_escape(m, fsloc->locations[i].hosts, ",;@ \t\n\\");
1204 }
1205 }
1206}
1207
1208static int e_show(struct seq_file *m, void *p)
1209{
1210 struct cache_head *cp = p;
1211 struct svc_export *exp = container_of(cp, struct svc_export, h);
1212 struct cache_detail *cd = m->private;
1213
1214 if (p == SEQ_START_TOKEN) {
1215 seq_puts(m, "# Version 1.1\n");
1216 seq_puts(m, "# Path Client(Flags) # IPs\n");
1217 return 0;
1218 }
1219
1220 cache_get(&exp->h);
1221 if (cache_check(cd, &exp->h, NULL))
1222 return 0;
1223 exp_put(exp);
1224 return svc_export_show(m, cd, cp);
1225}
1226
1227const struct seq_operations nfs_exports_op = {
1228 .start = e_start,
1229 .next = e_next,
1230 .stop = e_stop,
1231 .show = e_show,
1232};
1233
1234/*
1235 * Initialize the exports module.
1236 */
1237int
1238nfsd_export_init(struct net *net)
1239{
1240 int rv;
1241 struct nfsd_net *nn = net_generic(net, nfsd_net_id);
1242
1243 dprintk("nfsd: initializing export module (net: %p).\n", net);
1244
1245 nn->svc_export_cache = cache_create_net(&svc_export_cache_template, net);
1246 if (IS_ERR(nn->svc_export_cache))
1247 return PTR_ERR(nn->svc_export_cache);
1248 rv = cache_register_net(nn->svc_export_cache, net);
1249 if (rv)
1250 goto destroy_export_cache;
1251
1252 nn->svc_expkey_cache = cache_create_net(&svc_expkey_cache_template, net);
1253 if (IS_ERR(nn->svc_expkey_cache)) {
1254 rv = PTR_ERR(nn->svc_expkey_cache);
1255 goto unregister_export_cache;
1256 }
1257 rv = cache_register_net(nn->svc_expkey_cache, net);
1258 if (rv)
1259 goto destroy_expkey_cache;
1260 return 0;
1261
1262destroy_expkey_cache:
1263 cache_destroy_net(nn->svc_expkey_cache, net);
1264unregister_export_cache:
1265 cache_unregister_net(nn->svc_export_cache, net);
1266destroy_export_cache:
1267 cache_destroy_net(nn->svc_export_cache, net);
1268 return rv;
1269}
1270
1271/*
1272 * Flush exports table - called when last nfsd thread is killed
1273 */
1274void
1275nfsd_export_flush(struct net *net)
1276{
1277 struct nfsd_net *nn = net_generic(net, nfsd_net_id);
1278
1279 cache_purge(nn->svc_expkey_cache);
1280 cache_purge(nn->svc_export_cache);
1281}
1282
1283/*
1284 * Shutdown the exports module.
1285 */
1286void
1287nfsd_export_shutdown(struct net *net)
1288{
1289 struct nfsd_net *nn = net_generic(net, nfsd_net_id);
1290
1291 dprintk("nfsd: shutting down export module (net: %p).\n", net);
1292
1293 cache_unregister_net(nn->svc_expkey_cache, net);
1294 cache_unregister_net(nn->svc_export_cache, net);
1295 cache_destroy_net(nn->svc_expkey_cache, net);
1296 cache_destroy_net(nn->svc_export_cache, net);
1297 svcauth_unix_purge(net);
1298
1299 dprintk("nfsd: export shutdown complete (net: %p).\n", net);
1300}