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Linux/fs/nfsd/export.c

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

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