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Linux/fs/nfsd/export.c

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  1 // SPDX-License-Identifier: GPL-2.0
  2 /*
  3  * NFS exporting and validation.
  4  *
  5  * We maintain a list of clients, each of which has a list of
  6  * exports. To export an fs to a given client, you first have
  7  * to create the client entry with NFSCTL_ADDCLIENT, which
  8  * creates a client control block and adds it to the hash
  9  * table. Then, you call NFSCTL_EXPORT for each fs.
 10  *
 11  *
 12  * Copyright (C) 1995, 1996 Olaf Kirch, <okir@monad.swb.de>
 13  */
 14 
 15 #include <linux/slab.h>
 16 #include <linux/namei.h>
 17 #include <linux/module.h>
 18 #include <linux/exportfs.h>
 19 #include <linux/sunrpc/svc_xprt.h>
 20 
 21 #include "nfsd.h"
 22 #include "nfsfh.h"
 23 #include "netns.h"
 24 #include "pnfs.h"
 25 
 26 #define NFSDDBG_FACILITY        NFSDDBG_EXPORT
 27 
 28 /*
 29  * We have two caches.
 30  * One maps client+vfsmnt+dentry to export options - the export map
 31  * The other maps client+filehandle-fragment to export options. - the expkey map
 32  *
 33  * The export options are actually stored in the first map, and the
 34  * second map contains a reference to the entry in the first map.
 35  */
 36 
 37 #define EXPKEY_HASHBITS         8
 38 #define EXPKEY_HASHMAX          (1 << EXPKEY_HASHBITS)
 39 #define EXPKEY_HASHMASK         (EXPKEY_HASHMAX -1)
 40 
 41 static void expkey_put(struct kref *ref)
 42 {
 43         struct svc_expkey *key = container_of(ref, struct svc_expkey, h.ref);
 44 
 45         if (test_bit(CACHE_VALID, &key->h.flags) &&
 46             !test_bit(CACHE_NEGATIVE, &key->h.flags))
 47                 path_put(&key->ek_path);
 48         auth_domain_put(key->ek_client);
 49         kfree(key);
 50 }
 51 
 52 static void expkey_request(struct cache_detail *cd,
 53                            struct cache_head *h,
 54                            char **bpp, int *blen)
 55 {
 56         /* client fsidtype \xfsid */
 57         struct svc_expkey *ek = container_of(h, struct svc_expkey, h);
 58         char type[5];
 59 
 60         qword_add(bpp, blen, ek->ek_client->name);
 61         snprintf(type, 5, "%d", ek->ek_fsidtype);
 62         qword_add(bpp, blen, type);
 63         qword_addhex(bpp, blen, (char*)ek->ek_fsid, key_len(ek->ek_fsidtype));
 64         (*bpp)[-1] = '\n';
 65 }
 66 
 67 static struct svc_expkey *svc_expkey_update(struct cache_detail *cd, struct svc_expkey *new,
 68                                             struct svc_expkey *old);
 69 static struct svc_expkey *svc_expkey_lookup(struct cache_detail *cd, struct svc_expkey *);
 70 
 71 static int expkey_parse(struct cache_detail *cd, char *mesg, int mlen)
 72 {
 73         /* client fsidtype fsid expiry [path] */
 74         char *buf;
 75         int len;
 76         struct auth_domain *dom = NULL;
 77         int err;
 78         int fsidtype;
 79         char *ep;
 80         struct svc_expkey key;
 81         struct svc_expkey *ek = NULL;
 82 
 83         if (mesg[mlen - 1] != '\n')
 84                 return -EINVAL;
 85         mesg[mlen-1] = 0;
 86 
 87         buf = kmalloc(PAGE_SIZE, GFP_KERNEL);
 88         err = -ENOMEM;
 89         if (!buf)
 90                 goto out;
 91 
 92         err = -EINVAL;
 93         if ((len=qword_get(&mesg, buf, PAGE_SIZE)) <= 0)
 94                 goto out;
 95 
 96         err = -ENOENT;
 97         dom = auth_domain_find(buf);
 98         if (!dom)
 99                 goto out;
100         dprintk("found domain %s\n", buf);
101 
102         err = -EINVAL;
103         if ((len=qword_get(&mesg, buf, PAGE_SIZE)) <= 0)
104                 goto out;
105         fsidtype = simple_strtoul(buf, &ep, 10);
106         if (*ep)
107                 goto out;
108         dprintk("found fsidtype %d\n", fsidtype);
109         if (key_len(fsidtype)==0) /* invalid type */
110                 goto out;
111         if ((len=qword_get(&mesg, buf, PAGE_SIZE)) <= 0)
112                 goto out;
113         dprintk("found fsid length %d\n", len);
114         if (len != key_len(fsidtype))
115                 goto out;
116 
117         /* OK, we seem to have a valid key */
118         key.h.flags = 0;
119         key.h.expiry_time = get_expiry(&mesg);
120         if (key.h.expiry_time == 0)
121                 goto out;
122 
123         key.ek_client = dom;    
124         key.ek_fsidtype = fsidtype;
125         memcpy(key.ek_fsid, buf, len);
126 
127         ek = svc_expkey_lookup(cd, &key);
128         err = -ENOMEM;
129         if (!ek)
130                 goto out;
131 
132         /* now we want a pathname, or empty meaning NEGATIVE  */
133         err = -EINVAL;
134         len = qword_get(&mesg, buf, PAGE_SIZE);
135         if (len < 0)
136                 goto out;
137         dprintk("Path seems to be <%s>\n", buf);
138         err = 0;
139         if (len == 0) {
140                 set_bit(CACHE_NEGATIVE, &key.h.flags);
141                 ek = svc_expkey_update(cd, &key, ek);
142                 if (!ek)
143                         err = -ENOMEM;
144         } else {
145                 err = kern_path(buf, 0, &key.ek_path);
146                 if (err)
147                         goto out;
148 
149                 dprintk("Found the path %s\n", buf);
150 
151                 ek = svc_expkey_update(cd, &key, ek);
152                 if (!ek)
153                         err = -ENOMEM;
154                 path_put(&key.ek_path);
155         }
156         cache_flush();
157  out:
158         if (ek)
159                 cache_put(&ek->h, cd);
160         if (dom)
161                 auth_domain_put(dom);
162         kfree(buf);
163         return err;
164 }
165 
166 static int expkey_show(struct seq_file *m,
167                        struct cache_detail *cd,
168                        struct cache_head *h)
169 {
170         struct svc_expkey *ek ;
171         int i;
172 
173         if (h ==NULL) {
174                 seq_puts(m, "#domain fsidtype fsid [path]\n");
175                 return 0;
176         }
177         ek = container_of(h, struct svc_expkey, h);
178         seq_printf(m, "%s %d 0x", ek->ek_client->name,
179                    ek->ek_fsidtype);
180         for (i=0; i < key_len(ek->ek_fsidtype)/4; i++)
181                 seq_printf(m, "%08x", ek->ek_fsid[i]);
182         if (test_bit(CACHE_VALID, &h->flags) && 
183             !test_bit(CACHE_NEGATIVE, &h->flags)) {
184                 seq_printf(m, " ");
185                 seq_path(m, &ek->ek_path, "\\ \t\n");
186         }
187         seq_printf(m, "\n");
188         return 0;
189 }
190 
191 static inline int expkey_match (struct cache_head *a, struct cache_head *b)
192 {
193         struct svc_expkey *orig = container_of(a, struct svc_expkey, h);
194         struct svc_expkey *new = container_of(b, struct svc_expkey, h);
195 
196         if (orig->ek_fsidtype != new->ek_fsidtype ||
197             orig->ek_client != new->ek_client ||
198             memcmp(orig->ek_fsid, new->ek_fsid, key_len(orig->ek_fsidtype)) != 0)
199                 return 0;
200         return 1;
201 }
202 
203 static inline void expkey_init(struct cache_head *cnew,
204                                    struct cache_head *citem)
205 {
206         struct svc_expkey *new = container_of(cnew, struct svc_expkey, h);
207         struct svc_expkey *item = container_of(citem, struct svc_expkey, h);
208 
209         kref_get(&item->ek_client->ref);
210         new->ek_client = item->ek_client;
211         new->ek_fsidtype = item->ek_fsidtype;
212 
213         memcpy(new->ek_fsid, item->ek_fsid, sizeof(new->ek_fsid));
214 }
215 
216 static inline void expkey_update(struct cache_head *cnew,
217                                    struct cache_head *citem)
218 {
219         struct svc_expkey *new = container_of(cnew, struct svc_expkey, h);
220         struct svc_expkey *item = container_of(citem, struct svc_expkey, h);
221 
222         new->ek_path = item->ek_path;
223         path_get(&item->ek_path);
224 }
225 
226 static struct cache_head *expkey_alloc(void)
227 {
228         struct svc_expkey *i = kmalloc(sizeof(*i), GFP_KERNEL);
229         if (i)
230                 return &i->h;
231         else
232                 return NULL;
233 }
234 
235 static const struct cache_detail svc_expkey_cache_template = {
236         .owner          = THIS_MODULE,
237         .hash_size      = EXPKEY_HASHMAX,
238         .name           = "nfsd.fh",
239         .cache_put      = expkey_put,
240         .cache_request  = expkey_request,
241         .cache_parse    = expkey_parse,
242         .cache_show     = expkey_show,
243         .match          = expkey_match,
244         .init           = expkey_init,
245         .update         = expkey_update,
246         .alloc          = expkey_alloc,
247 };
248 
249 static int
250 svc_expkey_hash(struct svc_expkey *item)
251 {
252         int hash = item->ek_fsidtype;
253         char * cp = (char*)item->ek_fsid;
254         int len = key_len(item->ek_fsidtype);
255 
256         hash ^= hash_mem(cp, len, EXPKEY_HASHBITS);
257         hash ^= hash_ptr(item->ek_client, EXPKEY_HASHBITS);
258         hash &= EXPKEY_HASHMASK;
259         return hash;
260 }
261 
262 static struct svc_expkey *
263 svc_expkey_lookup(struct cache_detail *cd, struct svc_expkey *item)
264 {
265         struct cache_head *ch;
266         int hash = svc_expkey_hash(item);
267 
268         ch = sunrpc_cache_lookup(cd, &item->h, hash);
269         if (ch)
270                 return container_of(ch, struct svc_expkey, h);
271         else
272                 return NULL;
273 }
274 
275 static struct svc_expkey *
276 svc_expkey_update(struct cache_detail *cd, struct svc_expkey *new,
277                   struct svc_expkey *old)
278 {
279         struct cache_head *ch;
280         int hash = svc_expkey_hash(new);
281 
282         ch = sunrpc_cache_update(cd, &new->h, &old->h, hash);
283         if (ch)
284                 return container_of(ch, struct svc_expkey, h);
285         else
286                 return NULL;
287 }
288 
289 
290 #define EXPORT_HASHBITS         8
291 #define EXPORT_HASHMAX          (1<< EXPORT_HASHBITS)
292 
293 static void nfsd4_fslocs_free(struct nfsd4_fs_locations *fsloc)
294 {
295         struct nfsd4_fs_location *locations = fsloc->locations;
296         int i;
297 
298         if (!locations)
299                 return;
300 
301         for (i = 0; i < fsloc->locations_count; i++) {
302                 kfree(locations[i].path);
303                 kfree(locations[i].hosts);
304         }
305 
306         kfree(locations);
307         fsloc->locations = NULL;
308 }
309 
310 static void svc_export_put(struct kref *ref)
311 {
312         struct svc_export *exp = container_of(ref, struct svc_export, h.ref);
313         path_put(&exp->ex_path);
314         auth_domain_put(exp->ex_client);
315         nfsd4_fslocs_free(&exp->ex_fslocs);
316         kfree(exp->ex_uuid);
317         kfree(exp);
318 }
319 
320 static void svc_export_request(struct cache_detail *cd,
321                                struct cache_head *h,
322                                char **bpp, int *blen)
323 {
324         /*  client path */
325         struct svc_export *exp = container_of(h, struct svc_export, h);
326         char *pth;
327 
328         qword_add(bpp, blen, exp->ex_client->name);
329         pth = d_path(&exp->ex_path, *bpp, *blen);
330         if (IS_ERR(pth)) {
331                 /* is this correct? */
332                 (*bpp)[0] = '\n';
333                 return;
334         }
335         qword_add(bpp, blen, pth);
336         (*bpp)[-1] = '\n';
337 }
338 
339 static struct svc_export *svc_export_update(struct svc_export *new,
340                                             struct svc_export *old);
341 static struct svc_export *svc_export_lookup(struct svc_export *);
342 
343 static int check_export(struct inode *inode, int *flags, unsigned char *uuid)
344 {
345 
346         /*
347          * We currently export only dirs, regular files, and (for v4
348          * pseudoroot) symlinks.
349          */
350         if (!S_ISDIR(inode->i_mode) &&
351             !S_ISLNK(inode->i_mode) &&
352             !S_ISREG(inode->i_mode))
353                 return -ENOTDIR;
354 
355         /*
356          * Mountd should never pass down a writeable V4ROOT export, but,
357          * just to make sure:
358          */
359         if (*flags & NFSEXP_V4ROOT)
360                 *flags |= NFSEXP_READONLY;
361 
362         /* There are two requirements on a filesystem to be exportable.
363          * 1:  We must be able to identify the filesystem from a number.
364          *       either a device number (so FS_REQUIRES_DEV needed)
365          *       or an FSID number (so NFSEXP_FSID or ->uuid is needed).
366          * 2:  We must be able to find an inode from a filehandle.
367          *       This means that s_export_op must be set.
368          */
369         if (!(inode->i_sb->s_type->fs_flags & FS_REQUIRES_DEV) &&
370             !(*flags & NFSEXP_FSID) &&
371             uuid == NULL) {
372                 dprintk("exp_export: export of non-dev fs without fsid\n");
373                 return -EINVAL;
374         }
375 
376         if (!inode->i_sb->s_export_op ||
377             !inode->i_sb->s_export_op->fh_to_dentry) {
378                 dprintk("exp_export: export of invalid fs type.\n");
379                 return -EINVAL;
380         }
381 
382         return 0;
383 
384 }
385 
386 #ifdef CONFIG_NFSD_V4
387 
388 static int
389 fsloc_parse(char **mesg, char *buf, struct nfsd4_fs_locations *fsloc)
390 {
391         int len;
392         int migrated, i, err;
393 
394         /* more than one fsloc */
395         if (fsloc->locations)
396                 return -EINVAL;
397 
398         /* listsize */
399         err = get_uint(mesg, &fsloc->locations_count);
400         if (err)
401                 return err;
402         if (fsloc->locations_count > MAX_FS_LOCATIONS)
403                 return -EINVAL;
404         if (fsloc->locations_count == 0)
405                 return 0;
406 
407         fsloc->locations = kzalloc(fsloc->locations_count
408                         * sizeof(struct nfsd4_fs_location), GFP_KERNEL);
409         if (!fsloc->locations)
410                 return -ENOMEM;
411         for (i=0; i < fsloc->locations_count; i++) {
412                 /* colon separated host list */
413                 err = -EINVAL;
414                 len = qword_get(mesg, buf, PAGE_SIZE);
415                 if (len <= 0)
416                         goto out_free_all;
417                 err = -ENOMEM;
418                 fsloc->locations[i].hosts = kstrdup(buf, GFP_KERNEL);
419                 if (!fsloc->locations[i].hosts)
420                         goto out_free_all;
421                 err = -EINVAL;
422                 /* slash separated path component list */
423                 len = qword_get(mesg, buf, PAGE_SIZE);
424                 if (len <= 0)
425                         goto out_free_all;
426                 err = -ENOMEM;
427                 fsloc->locations[i].path = kstrdup(buf, GFP_KERNEL);
428                 if (!fsloc->locations[i].path)
429                         goto out_free_all;
430         }
431         /* migrated */
432         err = get_int(mesg, &migrated);
433         if (err)
434                 goto out_free_all;
435         err = -EINVAL;
436         if (migrated < 0 || migrated > 1)
437                 goto out_free_all;
438         fsloc->migrated = migrated;
439         return 0;
440 out_free_all:
441         nfsd4_fslocs_free(fsloc);
442         return err;
443 }
444 
445 static int secinfo_parse(char **mesg, char *buf, struct svc_export *exp)
446 {
447         struct exp_flavor_info *f;
448         u32 listsize;
449         int err;
450 
451         /* more than one secinfo */
452         if (exp->ex_nflavors)
453                 return -EINVAL;
454 
455         err = get_uint(mesg, &listsize);
456         if (err)
457                 return err;
458         if (listsize > MAX_SECINFO_LIST)
459                 return -EINVAL;
460 
461         for (f = exp->ex_flavors; f < exp->ex_flavors + listsize; f++) {
462                 err = get_uint(mesg, &f->pseudoflavor);
463                 if (err)
464                         return err;
465                 /*
466                  * XXX: It would be nice to also check whether this
467                  * pseudoflavor is supported, so we can discover the
468                  * problem at export time instead of when a client fails
469                  * to authenticate.
470                  */
471                 err = get_uint(mesg, &f->flags);
472                 if (err)
473                         return err;
474                 /* Only some flags are allowed to differ between flavors: */
475                 if (~NFSEXP_SECINFO_FLAGS & (f->flags ^ exp->ex_flags))
476                         return -EINVAL;
477         }
478         exp->ex_nflavors = listsize;
479         return 0;
480 }
481 
482 #else /* CONFIG_NFSD_V4 */
483 static inline int
484 fsloc_parse(char **mesg, char *buf, struct nfsd4_fs_locations *fsloc){return 0;}
485 static inline int
486 secinfo_parse(char **mesg, char *buf, struct svc_export *exp) { return 0; }
487 #endif
488 
489 static inline int
490 nfsd_uuid_parse(char **mesg, char *buf, unsigned char **puuid)
491 {
492         int len;
493 
494         /* more than one uuid */
495         if (*puuid)
496                 return -EINVAL;
497 
498         /* expect a 16 byte uuid encoded as \xXXXX... */
499         len = qword_get(mesg, buf, PAGE_SIZE);
500         if (len != EX_UUID_LEN)
501                 return -EINVAL;
502 
503         *puuid = kmemdup(buf, EX_UUID_LEN, GFP_KERNEL);
504         if (*puuid == NULL)
505                 return -ENOMEM;
506 
507         return 0;
508 }
509 
510 static int svc_export_parse(struct cache_detail *cd, char *mesg, int mlen)
511 {
512         /* client path expiry [flags anonuid anongid fsid] */
513         char *buf;
514         int len;
515         int err;
516         struct auth_domain *dom = NULL;
517         struct svc_export exp = {}, *expp;
518         int an_int;
519 
520         if (mesg[mlen-1] != '\n')
521                 return -EINVAL;
522         mesg[mlen-1] = 0;
523 
524         buf = kmalloc(PAGE_SIZE, GFP_KERNEL);
525         if (!buf)
526                 return -ENOMEM;
527 
528         /* client */
529         err = -EINVAL;
530         len = qword_get(&mesg, buf, PAGE_SIZE);
531         if (len <= 0)
532                 goto out;
533 
534         err = -ENOENT;
535         dom = auth_domain_find(buf);
536         if (!dom)
537                 goto out;
538 
539         /* path */
540         err = -EINVAL;
541         if ((len = qword_get(&mesg, buf, PAGE_SIZE)) <= 0)
542                 goto out1;
543 
544         err = kern_path(buf, 0, &exp.ex_path);
545         if (err)
546                 goto out1;
547 
548         exp.ex_client = dom;
549         exp.cd = cd;
550         exp.ex_devid_map = NULL;
551 
552         /* expiry */
553         err = -EINVAL;
554         exp.h.expiry_time = get_expiry(&mesg);
555         if (exp.h.expiry_time == 0)
556                 goto out3;
557 
558         /* flags */
559         err = get_int(&mesg, &an_int);
560         if (err == -ENOENT) {
561                 err = 0;
562                 set_bit(CACHE_NEGATIVE, &exp.h.flags);
563         } else {
564                 if (err || an_int < 0)
565                         goto out3;
566                 exp.ex_flags= an_int;
567         
568                 /* anon uid */
569                 err = get_int(&mesg, &an_int);
570                 if (err)
571                         goto out3;
572                 exp.ex_anon_uid= make_kuid(&init_user_ns, an_int);
573 
574                 /* anon gid */
575                 err = get_int(&mesg, &an_int);
576                 if (err)
577                         goto out3;
578                 exp.ex_anon_gid= make_kgid(&init_user_ns, an_int);
579 
580                 /* fsid */
581                 err = get_int(&mesg, &an_int);
582                 if (err)
583                         goto out3;
584                 exp.ex_fsid = an_int;
585 
586                 while ((len = qword_get(&mesg, buf, PAGE_SIZE)) > 0) {
587                         if (strcmp(buf, "fsloc") == 0)
588                                 err = fsloc_parse(&mesg, buf, &exp.ex_fslocs);
589                         else if (strcmp(buf, "uuid") == 0)
590                                 err = nfsd_uuid_parse(&mesg, buf, &exp.ex_uuid);
591                         else if (strcmp(buf, "secinfo") == 0)
592                                 err = secinfo_parse(&mesg, buf, &exp);
593                         else
594                                 /* quietly ignore unknown words and anything
595                                  * following. Newer user-space can try to set
596                                  * new values, then see what the result was.
597                                  */
598                                 break;
599                         if (err)
600                                 goto out4;
601                 }
602 
603                 err = check_export(d_inode(exp.ex_path.dentry), &exp.ex_flags,
604                                    exp.ex_uuid);
605                 if (err)
606                         goto out4;
607                 /*
608                  * No point caching this if it would immediately expire.
609                  * Also, this protects exportfs's dummy export from the
610                  * anon_uid/anon_gid checks:
611                  */
612                 if (exp.h.expiry_time < seconds_since_boot())
613                         goto out4;
614                 /*
615                  * For some reason exportfs has been passing down an
616                  * invalid (-1) uid & gid on the "dummy" export which it
617                  * uses to test export support.  To make sure exportfs
618                  * sees errors from check_export we therefore need to
619                  * delay these checks till after check_export:
620                  */
621                 err = -EINVAL;
622                 if (!uid_valid(exp.ex_anon_uid))
623                         goto out4;
624                 if (!gid_valid(exp.ex_anon_gid))
625                         goto out4;
626                 err = 0;
627 
628                 nfsd4_setup_layout_type(&exp);
629         }
630 
631         expp = svc_export_lookup(&exp);
632         if (expp)
633                 expp = svc_export_update(&exp, expp);
634         else
635                 err = -ENOMEM;
636         cache_flush();
637         if (expp == NULL)
638                 err = -ENOMEM;
639         else
640                 exp_put(expp);
641 out4:
642         nfsd4_fslocs_free(&exp.ex_fslocs);
643         kfree(exp.ex_uuid);
644 out3:
645         path_put(&exp.ex_path);
646 out1:
647         auth_domain_put(dom);
648 out:
649         kfree(buf);
650         return err;
651 }
652 
653 static void exp_flags(struct seq_file *m, int flag, int fsid,
654                 kuid_t anonu, kgid_t anong, struct nfsd4_fs_locations *fslocs);
655 static void show_secinfo(struct seq_file *m, struct svc_export *exp);
656 
657 static int svc_export_show(struct seq_file *m,
658                            struct cache_detail *cd,
659                            struct cache_head *h)
660 {
661         struct svc_export *exp ;
662 
663         if (h ==NULL) {
664                 seq_puts(m, "#path domain(flags)\n");
665                 return 0;
666         }
667         exp = container_of(h, struct svc_export, h);
668         seq_path(m, &exp->ex_path, " \t\n\\");
669         seq_putc(m, '\t');
670         seq_escape(m, exp->ex_client->name, " \t\n\\");
671         seq_putc(m, '(');
672         if (test_bit(CACHE_VALID, &h->flags) && 
673             !test_bit(CACHE_NEGATIVE, &h->flags)) {
674                 exp_flags(m, exp->ex_flags, exp->ex_fsid,
675                           exp->ex_anon_uid, exp->ex_anon_gid, &exp->ex_fslocs);
676                 if (exp->ex_uuid) {
677                         int i;
678                         seq_puts(m, ",uuid=");
679                         for (i = 0; i < EX_UUID_LEN; i++) {
680                                 if ((i&3) == 0 && i)
681                                         seq_putc(m, ':');
682                                 seq_printf(m, "%02x", exp->ex_uuid[i]);
683                         }
684                 }
685                 show_secinfo(m, exp);
686         }
687         seq_puts(m, ")\n");
688         return 0;
689 }
690 static int svc_export_match(struct cache_head *a, struct cache_head *b)
691 {
692         struct svc_export *orig = container_of(a, struct svc_export, h);
693         struct svc_export *new = container_of(b, struct svc_export, h);
694         return orig->ex_client == new->ex_client &&
695                 path_equal(&orig->ex_path, &new->ex_path);
696 }
697 
698 static void svc_export_init(struct cache_head *cnew, struct cache_head *citem)
699 {
700         struct svc_export *new = container_of(cnew, struct svc_export, h);
701         struct svc_export *item = container_of(citem, struct svc_export, h);
702 
703         kref_get(&item->ex_client->ref);
704         new->ex_client = item->ex_client;
705         new->ex_path = item->ex_path;
706         path_get(&item->ex_path);
707         new->ex_fslocs.locations = NULL;
708         new->ex_fslocs.locations_count = 0;
709         new->ex_fslocs.migrated = 0;
710         new->ex_layout_types = 0;
711         new->ex_uuid = NULL;
712         new->cd = item->cd;
713 }
714 
715 static void export_update(struct cache_head *cnew, struct cache_head *citem)
716 {
717         struct svc_export *new = container_of(cnew, struct svc_export, h);
718         struct svc_export *item = container_of(citem, struct svc_export, h);
719         int i;
720 
721         new->ex_flags = item->ex_flags;
722         new->ex_anon_uid = item->ex_anon_uid;
723         new->ex_anon_gid = item->ex_anon_gid;
724         new->ex_fsid = item->ex_fsid;
725         new->ex_devid_map = item->ex_devid_map;
726         item->ex_devid_map = NULL;
727         new->ex_uuid = item->ex_uuid;
728         item->ex_uuid = NULL;
729         new->ex_fslocs.locations = item->ex_fslocs.locations;
730         item->ex_fslocs.locations = NULL;
731         new->ex_fslocs.locations_count = item->ex_fslocs.locations_count;
732         item->ex_fslocs.locations_count = 0;
733         new->ex_fslocs.migrated = item->ex_fslocs.migrated;
734         item->ex_fslocs.migrated = 0;
735         new->ex_layout_types = item->ex_layout_types;
736         new->ex_nflavors = item->ex_nflavors;
737         for (i = 0; i < MAX_SECINFO_LIST; i++) {
738                 new->ex_flavors[i] = item->ex_flavors[i];
739         }
740 }
741 
742 static struct cache_head *svc_export_alloc(void)
743 {
744         struct svc_export *i = kmalloc(sizeof(*i), GFP_KERNEL);
745         if (i)
746                 return &i->h;
747         else
748                 return NULL;
749 }
750 
751 static const struct cache_detail svc_export_cache_template = {
752         .owner          = THIS_MODULE,
753         .hash_size      = EXPORT_HASHMAX,
754         .name           = "nfsd.export",
755         .cache_put      = svc_export_put,
756         .cache_request  = svc_export_request,
757         .cache_parse    = svc_export_parse,
758         .cache_show     = svc_export_show,
759         .match          = svc_export_match,
760         .init           = svc_export_init,
761         .update         = export_update,
762         .alloc          = svc_export_alloc,
763 };
764 
765 static int
766 svc_export_hash(struct svc_export *exp)
767 {
768         int hash;
769 
770         hash = hash_ptr(exp->ex_client, EXPORT_HASHBITS);
771         hash ^= hash_ptr(exp->ex_path.dentry, EXPORT_HASHBITS);
772         hash ^= hash_ptr(exp->ex_path.mnt, EXPORT_HASHBITS);
773         return hash;
774 }
775 
776 static struct svc_export *
777 svc_export_lookup(struct svc_export *exp)
778 {
779         struct cache_head *ch;
780         int hash = svc_export_hash(exp);
781 
782         ch = sunrpc_cache_lookup(exp->cd, &exp->h, hash);
783         if (ch)
784                 return container_of(ch, struct svc_export, h);
785         else
786                 return NULL;
787 }
788 
789 static struct svc_export *
790 svc_export_update(struct svc_export *new, struct svc_export *old)
791 {
792         struct cache_head *ch;
793         int hash = svc_export_hash(old);
794 
795         ch = sunrpc_cache_update(old->cd, &new->h, &old->h, hash);
796         if (ch)
797                 return container_of(ch, struct svc_export, h);
798         else
799                 return NULL;
800 }
801 
802 
803 static struct svc_expkey *
804 exp_find_key(struct cache_detail *cd, struct auth_domain *clp, int fsid_type,
805              u32 *fsidv, struct cache_req *reqp)
806 {
807         struct svc_expkey key, *ek;
808         int err;
809         
810         if (!clp)
811                 return ERR_PTR(-ENOENT);
812 
813         key.ek_client = clp;
814         key.ek_fsidtype = fsid_type;
815         memcpy(key.ek_fsid, fsidv, key_len(fsid_type));
816 
817         ek = svc_expkey_lookup(cd, &key);
818         if (ek == NULL)
819                 return ERR_PTR(-ENOMEM);
820         err = cache_check(cd, &ek->h, reqp);
821         if (err)
822                 return ERR_PTR(err);
823         return ek;
824 }
825 
826 static struct svc_export *
827 exp_get_by_name(struct cache_detail *cd, struct auth_domain *clp,
828                 const struct path *path, struct cache_req *reqp)
829 {
830         struct svc_export *exp, key;
831         int err;
832 
833         if (!clp)
834                 return ERR_PTR(-ENOENT);
835 
836         key.ex_client = clp;
837         key.ex_path = *path;
838         key.cd = cd;
839 
840         exp = svc_export_lookup(&key);
841         if (exp == NULL)
842                 return ERR_PTR(-ENOMEM);
843         err = cache_check(cd, &exp->h, reqp);
844         if (err)
845                 return ERR_PTR(err);
846         return exp;
847 }
848 
849 /*
850  * Find the export entry for a given dentry.
851  */
852 static struct svc_export *
853 exp_parent(struct cache_detail *cd, struct auth_domain *clp, struct path *path)
854 {
855         struct dentry *saved = dget(path->dentry);
856         struct svc_export *exp = exp_get_by_name(cd, clp, path, NULL);
857 
858         while (PTR_ERR(exp) == -ENOENT && !IS_ROOT(path->dentry)) {
859                 struct dentry *parent = dget_parent(path->dentry);
860                 dput(path->dentry);
861                 path->dentry = parent;
862                 exp = exp_get_by_name(cd, clp, path, NULL);
863         }
864         dput(path->dentry);
865         path->dentry = saved;
866         return exp;
867 }
868 
869 
870 
871 /*
872  * Obtain the root fh on behalf of a client.
873  * This could be done in user space, but I feel that it adds some safety
874  * since its harder to fool a kernel module than a user space program.
875  */
876 int
877 exp_rootfh(struct net *net, struct auth_domain *clp, char *name,
878            struct knfsd_fh *f, int maxsize)
879 {
880         struct svc_export       *exp;
881         struct path             path;
882         struct inode            *inode;
883         struct svc_fh           fh;
884         int                     err;
885         struct nfsd_net         *nn = net_generic(net, nfsd_net_id);
886         struct cache_detail     *cd = nn->svc_export_cache;
887 
888         err = -EPERM;
889         /* NB: we probably ought to check that it's NUL-terminated */
890         if (kern_path(name, 0, &path)) {
891                 printk("nfsd: exp_rootfh path not found %s", name);
892                 return err;
893         }
894         inode = d_inode(path.dentry);
895 
896         dprintk("nfsd: exp_rootfh(%s [%p] %s:%s/%ld)\n",
897                  name, path.dentry, clp->name,
898                  inode->i_sb->s_id, inode->i_ino);
899         exp = exp_parent(cd, clp, &path);
900         if (IS_ERR(exp)) {
901                 err = PTR_ERR(exp);
902                 goto out;
903         }
904 
905         /*
906          * fh must be initialized before calling fh_compose
907          */
908         fh_init(&fh, maxsize);
909         if (fh_compose(&fh, exp, path.dentry, NULL))
910                 err = -EINVAL;
911         else
912                 err = 0;
913         memcpy(f, &fh.fh_handle, sizeof(struct knfsd_fh));
914         fh_put(&fh);
915         exp_put(exp);
916 out:
917         path_put(&path);
918         return err;
919 }
920 
921 static struct svc_export *exp_find(struct cache_detail *cd,
922                                    struct auth_domain *clp, int fsid_type,
923                                    u32 *fsidv, struct cache_req *reqp)
924 {
925         struct svc_export *exp;
926         struct nfsd_net *nn = net_generic(cd->net, nfsd_net_id);
927         struct svc_expkey *ek = exp_find_key(nn->svc_expkey_cache, clp, fsid_type, fsidv, reqp);
928         if (IS_ERR(ek))
929                 return ERR_CAST(ek);
930 
931         exp = exp_get_by_name(cd, clp, &ek->ek_path, reqp);
932         cache_put(&ek->h, nn->svc_expkey_cache);
933 
934         if (IS_ERR(exp))
935                 return ERR_CAST(exp);
936         return exp;
937 }
938 
939 __be32 check_nfsd_access(struct svc_export *exp, struct svc_rqst *rqstp)
940 {
941         struct exp_flavor_info *f;
942         struct exp_flavor_info *end = exp->ex_flavors + exp->ex_nflavors;
943 
944         /* legacy gss-only clients are always OK: */
945         if (exp->ex_client == rqstp->rq_gssclient)
946                 return 0;
947         /* ip-address based client; check sec= export option: */
948         for (f = exp->ex_flavors; f < end; f++) {
949                 if (f->pseudoflavor == rqstp->rq_cred.cr_flavor)
950                         return 0;
951         }
952         /* defaults in absence of sec= options: */
953         if (exp->ex_nflavors == 0) {
954                 if (rqstp->rq_cred.cr_flavor == RPC_AUTH_NULL ||
955                     rqstp->rq_cred.cr_flavor == RPC_AUTH_UNIX)
956                         return 0;
957         }
958 
959         /* If the compound op contains a spo_must_allowed op,
960          * it will be sent with integrity/protection which
961          * will have to be expressly allowed on mounts that
962          * don't support it
963          */
964 
965         if (nfsd4_spo_must_allow(rqstp))
966                 return 0;
967 
968         return nfserr_wrongsec;
969 }
970 
971 /*
972  * Uses rq_client and rq_gssclient to find an export; uses rq_client (an
973  * auth_unix client) if it's available and has secinfo information;
974  * otherwise, will try to use rq_gssclient.
975  *
976  * Called from functions that handle requests; functions that do work on
977  * behalf of mountd are passed a single client name to use, and should
978  * use exp_get_by_name() or exp_find().
979  */
980 struct svc_export *
981 rqst_exp_get_by_name(struct svc_rqst *rqstp, struct path *path)
982 {
983         struct svc_export *gssexp, *exp = ERR_PTR(-ENOENT);
984         struct nfsd_net *nn = net_generic(SVC_NET(rqstp), nfsd_net_id);
985         struct cache_detail *cd = nn->svc_export_cache;
986 
987         if (rqstp->rq_client == NULL)
988                 goto gss;
989 
990         /* First try the auth_unix client: */
991         exp = exp_get_by_name(cd, rqstp->rq_client, path, &rqstp->rq_chandle);
992         if (PTR_ERR(exp) == -ENOENT)
993                 goto gss;
994         if (IS_ERR(exp))
995                 return exp;
996         /* If it has secinfo, assume there are no gss/... clients */
997         if (exp->ex_nflavors > 0)
998                 return exp;
999 gss:
1000         /* Otherwise, try falling back on gss client */
1001         if (rqstp->rq_gssclient == NULL)
1002                 return exp;
1003         gssexp = exp_get_by_name(cd, rqstp->rq_gssclient, path, &rqstp->rq_chandle);
1004         if (PTR_ERR(gssexp) == -ENOENT)
1005                 return exp;
1006         if (!IS_ERR(exp))
1007                 exp_put(exp);
1008         return gssexp;
1009 }
1010 
1011 struct svc_export *
1012 rqst_exp_find(struct svc_rqst *rqstp, int fsid_type, u32 *fsidv)
1013 {
1014         struct svc_export *gssexp, *exp = ERR_PTR(-ENOENT);
1015         struct nfsd_net *nn = net_generic(SVC_NET(rqstp), nfsd_net_id);
1016         struct cache_detail *cd = nn->svc_export_cache;
1017 
1018         if (rqstp->rq_client == NULL)
1019                 goto gss;
1020 
1021         /* First try the auth_unix client: */
1022         exp = exp_find(cd, rqstp->rq_client, fsid_type,
1023                        fsidv, &rqstp->rq_chandle);
1024         if (PTR_ERR(exp) == -ENOENT)
1025                 goto gss;
1026         if (IS_ERR(exp))
1027                 return exp;
1028         /* If it has secinfo, assume there are no gss/... clients */
1029         if (exp->ex_nflavors > 0)
1030                 return exp;
1031 gss:
1032         /* Otherwise, try falling back on gss client */
1033         if (rqstp->rq_gssclient == NULL)
1034                 return exp;
1035         gssexp = exp_find(cd, rqstp->rq_gssclient, fsid_type, fsidv,
1036                                                 &rqstp->rq_chandle);
1037         if (PTR_ERR(gssexp) == -ENOENT)
1038                 return exp;
1039         if (!IS_ERR(exp))
1040                 exp_put(exp);
1041         return gssexp;
1042 }
1043 
1044 struct svc_export *
1045 rqst_exp_parent(struct svc_rqst *rqstp, struct path *path)
1046 {
1047         struct dentry *saved = dget(path->dentry);
1048         struct svc_export *exp = rqst_exp_get_by_name(rqstp, path);
1049 
1050         while (PTR_ERR(exp) == -ENOENT && !IS_ROOT(path->dentry)) {
1051                 struct dentry *parent = dget_parent(path->dentry);
1052                 dput(path->dentry);
1053                 path->dentry = parent;
1054                 exp = rqst_exp_get_by_name(rqstp, path);
1055         }
1056         dput(path->dentry);
1057         path->dentry = saved;
1058         return exp;
1059 }
1060 
1061 struct svc_export *rqst_find_fsidzero_export(struct svc_rqst *rqstp)
1062 {
1063         u32 fsidv[2];
1064 
1065         mk_fsid(FSID_NUM, fsidv, 0, 0, 0, NULL);
1066 
1067         return rqst_exp_find(rqstp, FSID_NUM, fsidv);
1068 }
1069 
1070 /*
1071  * Called when we need the filehandle for the root of the pseudofs,
1072  * for a given NFSv4 client.   The root is defined to be the
1073  * export point with fsid==0
1074  */
1075 __be32
1076 exp_pseudoroot(struct svc_rqst *rqstp, struct svc_fh *fhp)
1077 {
1078         struct svc_export *exp;
1079         __be32 rv;
1080 
1081         exp = rqst_find_fsidzero_export(rqstp);
1082         if (IS_ERR(exp))
1083                 return nfserrno(PTR_ERR(exp));
1084         rv = fh_compose(fhp, exp, exp->ex_path.dentry, NULL);
1085         exp_put(exp);
1086         return rv;
1087 }
1088 
1089 static struct flags {
1090         int flag;
1091         char *name[2];
1092 } expflags[] = {
1093         { NFSEXP_READONLY, {"ro", "rw"}},
1094         { NFSEXP_INSECURE_PORT, {"insecure", ""}},
1095         { NFSEXP_ROOTSQUASH, {"root_squash", "no_root_squash"}},
1096         { NFSEXP_ALLSQUASH, {"all_squash", ""}},
1097         { NFSEXP_ASYNC, {"async", "sync"}},
1098         { NFSEXP_GATHERED_WRITES, {"wdelay", "no_wdelay"}},
1099         { NFSEXP_NOREADDIRPLUS, {"nordirplus", ""}},
1100         { NFSEXP_NOHIDE, {"nohide", ""}},
1101         { NFSEXP_CROSSMOUNT, {"crossmnt", ""}},
1102         { NFSEXP_NOSUBTREECHECK, {"no_subtree_check", ""}},
1103         { NFSEXP_NOAUTHNLM, {"insecure_locks", ""}},
1104         { NFSEXP_V4ROOT, {"v4root", ""}},
1105         { NFSEXP_PNFS, {"pnfs", ""}},
1106         { NFSEXP_SECURITY_LABEL, {"security_label", ""}},
1107         { 0, {"", ""}}
1108 };
1109 
1110 static void show_expflags(struct seq_file *m, int flags, int mask)
1111 {
1112         struct flags *flg;
1113         int state, first = 0;
1114 
1115         for (flg = expflags; flg->flag; flg++) {
1116                 if (flg->flag & ~mask)
1117                         continue;
1118                 state = (flg->flag & flags) ? 0 : 1;
1119                 if (*flg->name[state])
1120                         seq_printf(m, "%s%s", first++?",":"", flg->name[state]);
1121         }
1122 }
1123 
1124 static void show_secinfo_flags(struct seq_file *m, int flags)
1125 {
1126         seq_printf(m, ",");
1127         show_expflags(m, flags, NFSEXP_SECINFO_FLAGS);
1128 }
1129 
1130 static bool secinfo_flags_equal(int f, int g)
1131 {
1132         f &= NFSEXP_SECINFO_FLAGS;
1133         g &= NFSEXP_SECINFO_FLAGS;
1134         return f == g;
1135 }
1136 
1137 static int show_secinfo_run(struct seq_file *m, struct exp_flavor_info **fp, struct exp_flavor_info *end)
1138 {
1139         int flags;
1140 
1141         flags = (*fp)->flags;
1142         seq_printf(m, ",sec=%d", (*fp)->pseudoflavor);
1143         (*fp)++;
1144         while (*fp != end && secinfo_flags_equal(flags, (*fp)->flags)) {
1145                 seq_printf(m, ":%d", (*fp)->pseudoflavor);
1146                 (*fp)++;
1147         }
1148         return flags;
1149 }
1150 
1151 static void show_secinfo(struct seq_file *m, struct svc_export *exp)
1152 {
1153         struct exp_flavor_info *f;
1154         struct exp_flavor_info *end = exp->ex_flavors + exp->ex_nflavors;
1155         int flags;
1156 
1157         if (exp->ex_nflavors == 0)
1158                 return;
1159         f = exp->ex_flavors;
1160         flags = show_secinfo_run(m, &f, end);
1161         if (!secinfo_flags_equal(flags, exp->ex_flags))
1162                 show_secinfo_flags(m, flags);
1163         while (f != end) {
1164                 flags = show_secinfo_run(m, &f, end);
1165                 show_secinfo_flags(m, flags);
1166         }
1167 }
1168 
1169 static void exp_flags(struct seq_file *m, int flag, int fsid,
1170                 kuid_t anonu, kgid_t anong, struct nfsd4_fs_locations *fsloc)
1171 {
1172         show_expflags(m, flag, NFSEXP_ALLFLAGS);
1173         if (flag & NFSEXP_FSID)
1174                 seq_printf(m, ",fsid=%d", fsid);
1175         if (!uid_eq(anonu, make_kuid(&init_user_ns, (uid_t)-2)) &&
1176             !uid_eq(anonu, make_kuid(&init_user_ns, 0x10000-2)))
1177                 seq_printf(m, ",anonuid=%u", from_kuid(&init_user_ns, anonu));
1178         if (!gid_eq(anong, make_kgid(&init_user_ns, (gid_t)-2)) &&
1179             !gid_eq(anong, make_kgid(&init_user_ns, 0x10000-2)))
1180                 seq_printf(m, ",anongid=%u", from_kgid(&init_user_ns, anong));
1181         if (fsloc && fsloc->locations_count > 0) {
1182                 char *loctype = (fsloc->migrated) ? "refer" : "replicas";
1183                 int i;
1184 
1185                 seq_printf(m, ",%s=", loctype);
1186                 seq_escape(m, fsloc->locations[0].path, ",;@ \t\n\\");
1187                 seq_putc(m, '@');
1188                 seq_escape(m, fsloc->locations[0].hosts, ",;@ \t\n\\");
1189                 for (i = 1; i < fsloc->locations_count; i++) {
1190                         seq_putc(m, ';');
1191                         seq_escape(m, fsloc->locations[i].path, ",;@ \t\n\\");
1192                         seq_putc(m, '@');
1193                         seq_escape(m, fsloc->locations[i].hosts, ",;@ \t\n\\");
1194                 }
1195         }
1196 }
1197 
1198 static int e_show(struct seq_file *m, void *p)
1199 {
1200         struct cache_head *cp = p;
1201         struct svc_export *exp = container_of(cp, struct svc_export, h);
1202         struct cache_detail *cd = m->private;
1203 
1204         if (p == SEQ_START_TOKEN) {
1205                 seq_puts(m, "# Version 1.1\n");
1206                 seq_puts(m, "# Path Client(Flags) # IPs\n");
1207                 return 0;
1208         }
1209 
1210         exp_get(exp);
1211         if (cache_check(cd, &exp->h, NULL))
1212                 return 0;
1213         exp_put(exp);
1214         return svc_export_show(m, cd, cp);
1215 }
1216 
1217 const struct seq_operations nfs_exports_op = {
1218         .start  = cache_seq_start,
1219         .next   = cache_seq_next,
1220         .stop   = cache_seq_stop,
1221         .show   = e_show,
1222 };
1223 
1224 /*
1225  * Initialize the exports module.
1226  */
1227 int
1228 nfsd_export_init(struct net *net)
1229 {
1230         int rv;
1231         struct nfsd_net *nn = net_generic(net, nfsd_net_id);
1232 
1233         dprintk("nfsd: initializing export module (net: %x).\n", net->ns.inum);
1234 
1235         nn->svc_export_cache = cache_create_net(&svc_export_cache_template, net);
1236         if (IS_ERR(nn->svc_export_cache))
1237                 return PTR_ERR(nn->svc_export_cache);
1238         rv = cache_register_net(nn->svc_export_cache, net);
1239         if (rv)
1240                 goto destroy_export_cache;
1241 
1242         nn->svc_expkey_cache = cache_create_net(&svc_expkey_cache_template, net);
1243         if (IS_ERR(nn->svc_expkey_cache)) {
1244                 rv = PTR_ERR(nn->svc_expkey_cache);
1245                 goto unregister_export_cache;
1246         }
1247         rv = cache_register_net(nn->svc_expkey_cache, net);
1248         if (rv)
1249                 goto destroy_expkey_cache;
1250         return 0;
1251 
1252 destroy_expkey_cache:
1253         cache_destroy_net(nn->svc_expkey_cache, net);
1254 unregister_export_cache:
1255         cache_unregister_net(nn->svc_export_cache, net);
1256 destroy_export_cache:
1257         cache_destroy_net(nn->svc_export_cache, net);
1258         return rv;
1259 }
1260 
1261 /*
1262  * Flush exports table - called when last nfsd thread is killed
1263  */
1264 void
1265 nfsd_export_flush(struct net *net)
1266 {
1267         struct nfsd_net *nn = net_generic(net, nfsd_net_id);
1268 
1269         cache_purge(nn->svc_expkey_cache);
1270         cache_purge(nn->svc_export_cache);
1271 }
1272 
1273 /*
1274  * Shutdown the exports module.
1275  */
1276 void
1277 nfsd_export_shutdown(struct net *net)
1278 {
1279         struct nfsd_net *nn = net_generic(net, nfsd_net_id);
1280 
1281         dprintk("nfsd: shutting down export module (net: %x).\n", net->ns.inum);
1282 
1283         cache_unregister_net(nn->svc_expkey_cache, net);
1284         cache_unregister_net(nn->svc_export_cache, net);
1285         cache_destroy_net(nn->svc_expkey_cache, net);
1286         cache_destroy_net(nn->svc_export_cache, net);
1287         svcauth_unix_purge(net);
1288 
1289         dprintk("nfsd: export shutdown complete (net: %x).\n", net->ns.inum);
1290 }
1291 

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