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TOMOYO Linux Cross Reference
Linux/fs/afs/proc.c

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  1 // SPDX-License-Identifier: GPL-2.0-or-later
  2 /* /proc interface for AFS
  3  *
  4  * Copyright (C) 2002 Red Hat, Inc. All Rights Reserved.
  5  * Written by David Howells (dhowells@redhat.com)
  6  */
  7 
  8 #include <linux/slab.h>
  9 #include <linux/module.h>
 10 #include <linux/proc_fs.h>
 11 #include <linux/seq_file.h>
 12 #include <linux/sched.h>
 13 #include <linux/uaccess.h>
 14 #include "internal.h"
 15 
 16 struct afs_vl_seq_net_private {
 17         struct seq_net_private          seq;    /* Must be first */
 18         struct afs_vlserver_list        *vllist;
 19 };
 20 
 21 static inline struct afs_net *afs_seq2net(struct seq_file *m)
 22 {
 23         return afs_net(seq_file_net(m));
 24 }
 25 
 26 static inline struct afs_net *afs_seq2net_single(struct seq_file *m)
 27 {
 28         return afs_net(seq_file_single_net(m));
 29 }
 30 
 31 /*
 32  * Display the list of cells known to the namespace.
 33  */
 34 static int afs_proc_cells_show(struct seq_file *m, void *v)
 35 {
 36         struct afs_vlserver_list *vllist;
 37         struct afs_cell *cell;
 38 
 39         if (v == SEQ_START_TOKEN) {
 40                 /* display header on line 1 */
 41                 seq_puts(m, "USE    TTL SV NAME\n");
 42                 return 0;
 43         }
 44 
 45         cell = list_entry(v, struct afs_cell, proc_link);
 46         vllist = rcu_dereference(cell->vl_servers);
 47 
 48         /* display one cell per line on subsequent lines */
 49         seq_printf(m, "%3u %6lld %2u %s\n",
 50                    atomic_read(&cell->usage),
 51                    cell->dns_expiry - ktime_get_real_seconds(),
 52                    vllist->nr_servers,
 53                    cell->name);
 54         return 0;
 55 }
 56 
 57 static void *afs_proc_cells_start(struct seq_file *m, loff_t *_pos)
 58         __acquires(rcu)
 59 {
 60         rcu_read_lock();
 61         return seq_hlist_start_head_rcu(&afs_seq2net(m)->proc_cells, *_pos);
 62 }
 63 
 64 static void *afs_proc_cells_next(struct seq_file *m, void *v, loff_t *pos)
 65 {
 66         return seq_hlist_next_rcu(v, &afs_seq2net(m)->proc_cells, pos);
 67 }
 68 
 69 static void afs_proc_cells_stop(struct seq_file *m, void *v)
 70         __releases(rcu)
 71 {
 72         rcu_read_unlock();
 73 }
 74 
 75 static const struct seq_operations afs_proc_cells_ops = {
 76         .start  = afs_proc_cells_start,
 77         .next   = afs_proc_cells_next,
 78         .stop   = afs_proc_cells_stop,
 79         .show   = afs_proc_cells_show,
 80 };
 81 
 82 /*
 83  * handle writes to /proc/fs/afs/cells
 84  * - to add cells: echo "add <cellname> <IP>[:<IP>][:<IP>]"
 85  */
 86 static int afs_proc_cells_write(struct file *file, char *buf, size_t size)
 87 {
 88         struct seq_file *m = file->private_data;
 89         struct afs_net *net = afs_seq2net(m);
 90         char *name, *args;
 91         int ret;
 92 
 93         /* trim to first NL */
 94         name = memchr(buf, '\n', size);
 95         if (name)
 96                 *name = 0;
 97 
 98         /* split into command, name and argslist */
 99         name = strchr(buf, ' ');
100         if (!name)
101                 goto inval;
102         do {
103                 *name++ = 0;
104         } while(*name == ' ');
105         if (!*name)
106                 goto inval;
107 
108         args = strchr(name, ' ');
109         if (args) {
110                 do {
111                         *args++ = 0;
112                 } while(*args == ' ');
113                 if (!*args)
114                         goto inval;
115         }
116 
117         /* determine command to perform */
118         _debug("cmd=%s name=%s args=%s", buf, name, args);
119 
120         if (strcmp(buf, "add") == 0) {
121                 struct afs_cell *cell;
122 
123                 cell = afs_lookup_cell(net, name, strlen(name), args, true);
124                 if (IS_ERR(cell)) {
125                         ret = PTR_ERR(cell);
126                         goto done;
127                 }
128 
129                 if (test_and_set_bit(AFS_CELL_FL_NO_GC, &cell->flags))
130                         afs_put_cell(net, cell);
131         } else {
132                 goto inval;
133         }
134 
135         ret = 0;
136 
137 done:
138         _leave(" = %d", ret);
139         return ret;
140 
141 inval:
142         ret = -EINVAL;
143         printk("kAFS: Invalid Command on /proc/fs/afs/cells file\n");
144         goto done;
145 }
146 
147 /*
148  * Display the name of the current workstation cell.
149  */
150 static int afs_proc_rootcell_show(struct seq_file *m, void *v)
151 {
152         struct afs_cell *cell;
153         struct afs_net *net;
154 
155         net = afs_seq2net_single(m);
156         if (rcu_access_pointer(net->ws_cell)) {
157                 rcu_read_lock();
158                 cell = rcu_dereference(net->ws_cell);
159                 if (cell)
160                         seq_printf(m, "%s\n", cell->name);
161                 rcu_read_unlock();
162         }
163         return 0;
164 }
165 
166 /*
167  * Set the current workstation cell and optionally supply its list of volume
168  * location servers.
169  *
170  *      echo "cell.name:192.168.231.14" >/proc/fs/afs/rootcell
171  */
172 static int afs_proc_rootcell_write(struct file *file, char *buf, size_t size)
173 {
174         struct seq_file *m = file->private_data;
175         struct afs_net *net = afs_seq2net_single(m);
176         char *s;
177         int ret;
178 
179         ret = -EINVAL;
180         if (buf[0] == '.')
181                 goto out;
182         if (memchr(buf, '/', size))
183                 goto out;
184 
185         /* trim to first NL */
186         s = memchr(buf, '\n', size);
187         if (s)
188                 *s = 0;
189 
190         /* determine command to perform */
191         _debug("rootcell=%s", buf);
192 
193         ret = afs_cell_init(net, buf);
194 
195 out:
196         _leave(" = %d", ret);
197         return ret;
198 }
199 
200 static const char afs_vol_types[3][3] = {
201         [AFSVL_RWVOL]   = "RW",
202         [AFSVL_ROVOL]   = "RO",
203         [AFSVL_BACKVOL] = "BK",
204 };
205 
206 /*
207  * Display the list of volumes known to a cell.
208  */
209 static int afs_proc_cell_volumes_show(struct seq_file *m, void *v)
210 {
211         struct afs_cell *cell = PDE_DATA(file_inode(m->file));
212         struct afs_volume *vol = list_entry(v, struct afs_volume, proc_link);
213 
214         /* Display header on line 1 */
215         if (v == &cell->proc_volumes) {
216                 seq_puts(m, "USE VID      TY\n");
217                 return 0;
218         }
219 
220         seq_printf(m, "%3d %08llx %s\n",
221                    atomic_read(&vol->usage), vol->vid,
222                    afs_vol_types[vol->type]);
223 
224         return 0;
225 }
226 
227 static void *afs_proc_cell_volumes_start(struct seq_file *m, loff_t *_pos)
228         __acquires(cell->proc_lock)
229 {
230         struct afs_cell *cell = PDE_DATA(file_inode(m->file));
231 
232         read_lock(&cell->proc_lock);
233         return seq_list_start_head(&cell->proc_volumes, *_pos);
234 }
235 
236 static void *afs_proc_cell_volumes_next(struct seq_file *m, void *v,
237                                         loff_t *_pos)
238 {
239         struct afs_cell *cell = PDE_DATA(file_inode(m->file));
240 
241         return seq_list_next(v, &cell->proc_volumes, _pos);
242 }
243 
244 static void afs_proc_cell_volumes_stop(struct seq_file *m, void *v)
245         __releases(cell->proc_lock)
246 {
247         struct afs_cell *cell = PDE_DATA(file_inode(m->file));
248 
249         read_unlock(&cell->proc_lock);
250 }
251 
252 static const struct seq_operations afs_proc_cell_volumes_ops = {
253         .start  = afs_proc_cell_volumes_start,
254         .next   = afs_proc_cell_volumes_next,
255         .stop   = afs_proc_cell_volumes_stop,
256         .show   = afs_proc_cell_volumes_show,
257 };
258 
259 static const char *const dns_record_sources[NR__dns_record_source + 1] = {
260         [DNS_RECORD_UNAVAILABLE]        = "unav",
261         [DNS_RECORD_FROM_CONFIG]        = "cfg",
262         [DNS_RECORD_FROM_DNS_A]         = "A",
263         [DNS_RECORD_FROM_DNS_AFSDB]     = "AFSDB",
264         [DNS_RECORD_FROM_DNS_SRV]       = "SRV",
265         [DNS_RECORD_FROM_NSS]           = "nss",
266         [NR__dns_record_source]         = "[weird]"
267 };
268 
269 static const char *const dns_lookup_statuses[NR__dns_lookup_status + 1] = {
270         [DNS_LOOKUP_NOT_DONE]           = "no-lookup",
271         [DNS_LOOKUP_GOOD]               = "good",
272         [DNS_LOOKUP_GOOD_WITH_BAD]      = "good/bad",
273         [DNS_LOOKUP_BAD]                = "bad",
274         [DNS_LOOKUP_GOT_NOT_FOUND]      = "not-found",
275         [DNS_LOOKUP_GOT_LOCAL_FAILURE]  = "local-failure",
276         [DNS_LOOKUP_GOT_TEMP_FAILURE]   = "temp-failure",
277         [DNS_LOOKUP_GOT_NS_FAILURE]     = "ns-failure",
278         [NR__dns_lookup_status]         = "[weird]"
279 };
280 
281 /*
282  * Display the list of Volume Location servers we're using for a cell.
283  */
284 static int afs_proc_cell_vlservers_show(struct seq_file *m, void *v)
285 {
286         const struct afs_vl_seq_net_private *priv = m->private;
287         const struct afs_vlserver_list *vllist = priv->vllist;
288         const struct afs_vlserver_entry *entry;
289         const struct afs_vlserver *vlserver;
290         const struct afs_addr_list *alist;
291         int i;
292 
293         if (v == SEQ_START_TOKEN) {
294                 seq_printf(m, "# source %s, status %s\n",
295                            dns_record_sources[vllist ? vllist->source : 0],
296                            dns_lookup_statuses[vllist ? vllist->status : 0]);
297                 return 0;
298         }
299 
300         entry = v;
301         vlserver = entry->server;
302         alist = rcu_dereference(vlserver->addresses);
303 
304         seq_printf(m, "%s [p=%hu w=%hu s=%s,%s]:\n",
305                    vlserver->name, entry->priority, entry->weight,
306                    dns_record_sources[alist ? alist->source : entry->source],
307                    dns_lookup_statuses[alist ? alist->status : entry->status]);
308         if (alist) {
309                 for (i = 0; i < alist->nr_addrs; i++)
310                         seq_printf(m, " %c %pISpc\n",
311                                    alist->preferred == i ? '>' : '-',
312                                    &alist->addrs[i].transport);
313         }
314         return 0;
315 }
316 
317 static void *afs_proc_cell_vlservers_start(struct seq_file *m, loff_t *_pos)
318         __acquires(rcu)
319 {
320         struct afs_vl_seq_net_private *priv = m->private;
321         struct afs_vlserver_list *vllist;
322         struct afs_cell *cell = PDE_DATA(file_inode(m->file));
323         loff_t pos = *_pos;
324 
325         rcu_read_lock();
326 
327         vllist = rcu_dereference(cell->vl_servers);
328         priv->vllist = vllist;
329 
330         if (pos < 0)
331                 *_pos = pos = 0;
332         if (pos == 0)
333                 return SEQ_START_TOKEN;
334 
335         if (pos - 1 >= vllist->nr_servers)
336                 return NULL;
337 
338         return &vllist->servers[pos - 1];
339 }
340 
341 static void *afs_proc_cell_vlservers_next(struct seq_file *m, void *v,
342                                           loff_t *_pos)
343 {
344         struct afs_vl_seq_net_private *priv = m->private;
345         struct afs_vlserver_list *vllist = priv->vllist;
346         loff_t pos;
347 
348         pos = *_pos;
349         pos++;
350         *_pos = pos;
351         if (!vllist || pos - 1 >= vllist->nr_servers)
352                 return NULL;
353 
354         return &vllist->servers[pos - 1];
355 }
356 
357 static void afs_proc_cell_vlservers_stop(struct seq_file *m, void *v)
358         __releases(rcu)
359 {
360         rcu_read_unlock();
361 }
362 
363 static const struct seq_operations afs_proc_cell_vlservers_ops = {
364         .start  = afs_proc_cell_vlservers_start,
365         .next   = afs_proc_cell_vlservers_next,
366         .stop   = afs_proc_cell_vlservers_stop,
367         .show   = afs_proc_cell_vlservers_show,
368 };
369 
370 /*
371  * Display the list of fileservers we're using within a namespace.
372  */
373 static int afs_proc_servers_show(struct seq_file *m, void *v)
374 {
375         struct afs_server *server;
376         struct afs_addr_list *alist;
377         int i;
378 
379         if (v == SEQ_START_TOKEN) {
380                 seq_puts(m, "UUID                                 USE ADDR\n");
381                 return 0;
382         }
383 
384         server = list_entry(v, struct afs_server, proc_link);
385         alist = rcu_dereference(server->addresses);
386         seq_printf(m, "%pU %3d %pISpc%s\n",
387                    &server->uuid,
388                    atomic_read(&server->usage),
389                    &alist->addrs[0].transport,
390                    alist->preferred == 0 ? "*" : "");
391         for (i = 1; i < alist->nr_addrs; i++)
392                 seq_printf(m, "                                         %pISpc%s\n",
393                            &alist->addrs[i].transport,
394                            alist->preferred == i ? "*" : "");
395         return 0;
396 }
397 
398 static void *afs_proc_servers_start(struct seq_file *m, loff_t *_pos)
399         __acquires(rcu)
400 {
401         rcu_read_lock();
402         return seq_hlist_start_head_rcu(&afs_seq2net(m)->fs_proc, *_pos);
403 }
404 
405 static void *afs_proc_servers_next(struct seq_file *m, void *v, loff_t *_pos)
406 {
407         return seq_hlist_next_rcu(v, &afs_seq2net(m)->fs_proc, _pos);
408 }
409 
410 static void afs_proc_servers_stop(struct seq_file *m, void *v)
411         __releases(rcu)
412 {
413         rcu_read_unlock();
414 }
415 
416 static const struct seq_operations afs_proc_servers_ops = {
417         .start  = afs_proc_servers_start,
418         .next   = afs_proc_servers_next,
419         .stop   = afs_proc_servers_stop,
420         .show   = afs_proc_servers_show,
421 };
422 
423 /*
424  * Display the list of strings that may be substituted for the @sys pathname
425  * macro.
426  */
427 static int afs_proc_sysname_show(struct seq_file *m, void *v)
428 {
429         struct afs_net *net = afs_seq2net(m);
430         struct afs_sysnames *sysnames = net->sysnames;
431         unsigned int i = (unsigned long)v - 1;
432 
433         if (i < sysnames->nr)
434                 seq_printf(m, "%s\n", sysnames->subs[i]);
435         return 0;
436 }
437 
438 static void *afs_proc_sysname_start(struct seq_file *m, loff_t *pos)
439         __acquires(&net->sysnames_lock)
440 {
441         struct afs_net *net = afs_seq2net(m);
442         struct afs_sysnames *names;
443 
444         read_lock(&net->sysnames_lock);
445 
446         names = net->sysnames;
447         if (*pos >= names->nr)
448                 return NULL;
449         return (void *)(unsigned long)(*pos + 1);
450 }
451 
452 static void *afs_proc_sysname_next(struct seq_file *m, void *v, loff_t *pos)
453 {
454         struct afs_net *net = afs_seq2net(m);
455         struct afs_sysnames *names = net->sysnames;
456 
457         *pos += 1;
458         if (*pos >= names->nr)
459                 return NULL;
460         return (void *)(unsigned long)(*pos + 1);
461 }
462 
463 static void afs_proc_sysname_stop(struct seq_file *m, void *v)
464         __releases(&net->sysnames_lock)
465 {
466         struct afs_net *net = afs_seq2net(m);
467 
468         read_unlock(&net->sysnames_lock);
469 }
470 
471 static const struct seq_operations afs_proc_sysname_ops = {
472         .start  = afs_proc_sysname_start,
473         .next   = afs_proc_sysname_next,
474         .stop   = afs_proc_sysname_stop,
475         .show   = afs_proc_sysname_show,
476 };
477 
478 /*
479  * Allow the @sys substitution to be configured.
480  */
481 static int afs_proc_sysname_write(struct file *file, char *buf, size_t size)
482 {
483         struct afs_sysnames *sysnames, *kill;
484         struct seq_file *m = file->private_data;
485         struct afs_net *net = afs_seq2net(m);
486         char *s, *p, *sub;
487         int ret, len;
488 
489         sysnames = kzalloc(sizeof(*sysnames), GFP_KERNEL);
490         if (!sysnames)
491                 return -ENOMEM;
492         refcount_set(&sysnames->usage, 1);
493         kill = sysnames;
494 
495         p = buf;
496         while ((s = strsep(&p, " \t\n"))) {
497                 len = strlen(s);
498                 if (len == 0)
499                         continue;
500                 ret = -ENAMETOOLONG;
501                 if (len >= AFSNAMEMAX)
502                         goto error;
503 
504                 if (len >= 4 &&
505                     s[len - 4] == '@' &&
506                     s[len - 3] == 's' &&
507                     s[len - 2] == 'y' &&
508                     s[len - 1] == 's')
509                         /* Protect against recursion */
510                         goto invalid;
511 
512                 if (s[0] == '.' &&
513                     (len < 2 || (len == 2 && s[1] == '.')))
514                         goto invalid;
515 
516                 if (memchr(s, '/', len))
517                         goto invalid;
518 
519                 ret = -EFBIG;
520                 if (sysnames->nr >= AFS_NR_SYSNAME)
521                         goto out;
522 
523                 if (strcmp(s, afs_init_sysname) == 0) {
524                         sub = (char *)afs_init_sysname;
525                 } else {
526                         ret = -ENOMEM;
527                         sub = kmemdup(s, len + 1, GFP_KERNEL);
528                         if (!sub)
529                                 goto out;
530                 }
531 
532                 sysnames->subs[sysnames->nr] = sub;
533                 sysnames->nr++;
534         }
535 
536         if (sysnames->nr == 0) {
537                 sysnames->subs[0] = sysnames->blank;
538                 sysnames->nr++;
539         }
540 
541         write_lock(&net->sysnames_lock);
542         kill = net->sysnames;
543         net->sysnames = sysnames;
544         write_unlock(&net->sysnames_lock);
545         ret = 0;
546 out:
547         afs_put_sysnames(kill);
548         return ret;
549 
550 invalid:
551         ret = -EINVAL;
552 error:
553         goto out;
554 }
555 
556 void afs_put_sysnames(struct afs_sysnames *sysnames)
557 {
558         int i;
559 
560         if (sysnames && refcount_dec_and_test(&sysnames->usage)) {
561                 for (i = 0; i < sysnames->nr; i++)
562                         if (sysnames->subs[i] != afs_init_sysname &&
563                             sysnames->subs[i] != sysnames->blank)
564                                 kfree(sysnames->subs[i]);
565         }
566 }
567 
568 /*
569  * Display general per-net namespace statistics
570  */
571 static int afs_proc_stats_show(struct seq_file *m, void *v)
572 {
573         struct afs_net *net = afs_seq2net_single(m);
574 
575         seq_puts(m, "kAFS statistics\n");
576 
577         seq_printf(m, "dir-mgmt: look=%u reval=%u inval=%u relpg=%u\n",
578                    atomic_read(&net->n_lookup),
579                    atomic_read(&net->n_reval),
580                    atomic_read(&net->n_inval),
581                    atomic_read(&net->n_relpg));
582 
583         seq_printf(m, "dir-data: rdpg=%u\n",
584                    atomic_read(&net->n_read_dir));
585 
586         seq_printf(m, "dir-edit: cr=%u rm=%u\n",
587                    atomic_read(&net->n_dir_cr),
588                    atomic_read(&net->n_dir_rm));
589 
590         seq_printf(m, "file-rd : n=%u nb=%lu\n",
591                    atomic_read(&net->n_fetches),
592                    atomic_long_read(&net->n_fetch_bytes));
593         seq_printf(m, "file-wr : n=%u nb=%lu\n",
594                    atomic_read(&net->n_stores),
595                    atomic_long_read(&net->n_store_bytes));
596         return 0;
597 }
598 
599 /*
600  * initialise /proc/fs/afs/<cell>/
601  */
602 int afs_proc_cell_setup(struct afs_cell *cell)
603 {
604         struct proc_dir_entry *dir;
605         struct afs_net *net = cell->net;
606 
607         _enter("%p{%s},%p", cell, cell->name, net->proc_afs);
608 
609         dir = proc_net_mkdir(net->net, cell->name, net->proc_afs);
610         if (!dir)
611                 goto error_dir;
612 
613         if (!proc_create_net_data("vlservers", 0444, dir,
614                                   &afs_proc_cell_vlservers_ops,
615                                   sizeof(struct afs_vl_seq_net_private),
616                                   cell) ||
617             !proc_create_net_data("volumes", 0444, dir,
618                                   &afs_proc_cell_volumes_ops,
619                                   sizeof(struct seq_net_private),
620                                   cell))
621                 goto error_tree;
622 
623         _leave(" = 0");
624         return 0;
625 
626 error_tree:
627         remove_proc_subtree(cell->name, net->proc_afs);
628 error_dir:
629         _leave(" = -ENOMEM");
630         return -ENOMEM;
631 }
632 
633 /*
634  * remove /proc/fs/afs/<cell>/
635  */
636 void afs_proc_cell_remove(struct afs_cell *cell)
637 {
638         struct afs_net *net = cell->net;
639 
640         _enter("");
641         remove_proc_subtree(cell->name, net->proc_afs);
642         _leave("");
643 }
644 
645 /*
646  * initialise the /proc/fs/afs/ directory
647  */
648 int afs_proc_init(struct afs_net *net)
649 {
650         struct proc_dir_entry *p;
651 
652         _enter("");
653 
654         p = proc_net_mkdir(net->net, "afs", net->net->proc_net);
655         if (!p)
656                 goto error_dir;
657 
658         if (!proc_create_net_data_write("cells", 0644, p,
659                                         &afs_proc_cells_ops,
660                                         afs_proc_cells_write,
661                                         sizeof(struct seq_net_private),
662                                         NULL) ||
663             !proc_create_net_single_write("rootcell", 0644, p,
664                                           afs_proc_rootcell_show,
665                                           afs_proc_rootcell_write,
666                                           NULL) ||
667             !proc_create_net("servers", 0444, p, &afs_proc_servers_ops,
668                              sizeof(struct seq_net_private)) ||
669             !proc_create_net_single("stats", 0444, p, afs_proc_stats_show, NULL) ||
670             !proc_create_net_data_write("sysname", 0644, p,
671                                         &afs_proc_sysname_ops,
672                                         afs_proc_sysname_write,
673                                         sizeof(struct seq_net_private),
674                                         NULL))
675                 goto error_tree;
676 
677         net->proc_afs = p;
678         _leave(" = 0");
679         return 0;
680 
681 error_tree:
682         proc_remove(p);
683 error_dir:
684         _leave(" = -ENOMEM");
685         return -ENOMEM;
686 }
687 
688 /*
689  * clean up the /proc/fs/afs/ directory
690  */
691 void afs_proc_cleanup(struct afs_net *net)
692 {
693         proc_remove(net->proc_afs);
694         net->proc_afs = NULL;
695 }
696 

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